drivers/net/virtio_net.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* A network driver using virtio.
   3  *
   4  * Copyright 2007 Rusty Russell <[email protected]> IBM Corporation
   5  */
   6 //#define DEBUG
   7 #include <linux/netdevice.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/module.h>
  11 #include <linux/virtio.h>
  12 #include <linux/virtio_net.h>
  13 #include <linux/bpf.h>
  14 #include <linux/bpf_trace.h>
  15 #include <linux/scatterlist.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/slab.h>
  18 #include <linux/cpu.h>
  19 #include <linux/average.h>
  20 #include <linux/filter.h>
  21 #include <linux/kernel.h>
  22 #include <linux/dim.h>
  23 #include <net/route.h>
  24 #include <net/xdp.h>
  25 #include <net/net_failover.h>
  26 #include <net/netdev_rx_queue.h>
  27 #include <net/netdev_queues.h>
  28 #include <net/xdp_sock_drv.h>
  29
  30 static int napi_weight = NAPI_POLL_WEIGHT;
  31 module_param(napi_weight, int, 0444);
  32
  33 static bool csum = true, gso = true, napi_tx = true;
  34 module_param(csum, bool, 0444);
  35 module_param(gso, bool, 0444);
  36 module_param(napi_tx, bool, 0644);
  37
  38 /* FIXME: MTU in config. */
  39 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
  40 #define GOOD_COPY_LEN   128
  41
  42 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
  43
  44 /* Separating two types of XDP xmit */
  45 #define VIRTIO_XDP_TX           BIT(0)
  46 #define VIRTIO_XDP_REDIR        BIT(1)
  47
  48 /* RX packet size EWMA. The average packet size is used to determine the packet
  49  * buffer size when refilling RX rings. As the entire RX ring may be refilled
  50  * at once, the weight is chosen so that the EWMA will be insensitive to short-
  51  * term, transient changes in packet size.
  52  */
  53 DECLARE_EWMA(pkt_len, 0, 64)
  54
  55 #define VIRTNET_DRIVER_VERSION "1.0.0"
  56
  57 static const unsigned long guest_offloads[] = {
  58         VIRTIO_NET_F_GUEST_TSO4,
  59         VIRTIO_NET_F_GUEST_TSO6,
  60         VIRTIO_NET_F_GUEST_ECN,
  61         VIRTIO_NET_F_GUEST_UFO,
  62         VIRTIO_NET_F_GUEST_CSUM,
  63         VIRTIO_NET_F_GUEST_USO4,
  64         VIRTIO_NET_F_GUEST_USO6,
  65         VIRTIO_NET_F_GUEST_HDRLEN
  66 };
  67
  68 #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
  69                                 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
  70                                 (1ULL << VIRTIO_NET_F_GUEST_ECN)  | \
  71                                 (1ULL << VIRTIO_NET_F_GUEST_UFO)  | \
  72                                 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \
  73                                 (1ULL << VIRTIO_NET_F_GUEST_USO6))
  74
  75 struct virtnet_stat_desc {
  76         char desc[ETH_GSTRING_LEN];
  77         size_t offset;
  78         size_t qstat_offset;
  79 };
  80
  81 struct virtnet_sq_free_stats {
  82         u64 packets;
  83         u64 bytes;
  84         u64 napi_packets;
  85         u64 napi_bytes;
  86         u64 xsk;
  87 };
  88
  89 struct virtnet_sq_stats {
  90         struct u64_stats_sync syncp;
  91         u64_stats_t packets;
  92         u64_stats_t bytes;
  93         u64_stats_t xdp_tx;
  94         u64_stats_t xdp_tx_drops;
  95         u64_stats_t kicks;
  96         u64_stats_t tx_timeouts;
  97         u64_stats_t stop;
  98         u64_stats_t wake;
  99 };
 100
 101 struct virtnet_rq_stats {
 102         struct u64_stats_sync syncp;
 103         u64_stats_t packets;
 104         u64_stats_t bytes;
 105         u64_stats_t drops;
 106         u64_stats_t xdp_packets;
 107         u64_stats_t xdp_tx;
 108         u64_stats_t xdp_redirects;
 109         u64_stats_t xdp_drops;
 110         u64_stats_t kicks;
 111 };
 112
 113 #define VIRTNET_SQ_STAT(name, m) {name, offsetof(struct virtnet_sq_stats, m), -1}
 114 #define VIRTNET_RQ_STAT(name, m) {name, offsetof(struct virtnet_rq_stats, m), -1}
 115
 116 #define VIRTNET_SQ_STAT_QSTAT(name, m)                          \
 117         {                                                       \
 118                 name,                                           \
 119                 offsetof(struct virtnet_sq_stats, m),           \
 120                 offsetof(struct netdev_queue_stats_tx, m),      \
 121         }
 122
 123 #define VIRTNET_RQ_STAT_QSTAT(name, m)                          \
 124         {                                                       \
 125                 name,                                           \
 126                 offsetof(struct virtnet_rq_stats, m),           \
 127                 offsetof(struct netdev_queue_stats_rx, m),      \
 128         }
 129
 130 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
 131         VIRTNET_SQ_STAT("xdp_tx",       xdp_tx),
 132         VIRTNET_SQ_STAT("xdp_tx_drops", xdp_tx_drops),
 133         VIRTNET_SQ_STAT("kicks",        kicks),
 134         VIRTNET_SQ_STAT("tx_timeouts",  tx_timeouts),
 135 };
 136
 137 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
 138         VIRTNET_RQ_STAT("drops",         drops),
 139         VIRTNET_RQ_STAT("xdp_packets",   xdp_packets),
 140         VIRTNET_RQ_STAT("xdp_tx",        xdp_tx),
 141         VIRTNET_RQ_STAT("xdp_redirects", xdp_redirects),
 142         VIRTNET_RQ_STAT("xdp_drops",     xdp_drops),
 143         VIRTNET_RQ_STAT("kicks",         kicks),
 144 };
 145
 146 static const struct virtnet_stat_desc virtnet_sq_stats_desc_qstat[] = {
 147         VIRTNET_SQ_STAT_QSTAT("packets", packets),
 148         VIRTNET_SQ_STAT_QSTAT("bytes",   bytes),
 149         VIRTNET_SQ_STAT_QSTAT("stop",    stop),
 150         VIRTNET_SQ_STAT_QSTAT("wake",    wake),
 151 };
 152
 153 static const struct virtnet_stat_desc virtnet_rq_stats_desc_qstat[] = {
 154         VIRTNET_RQ_STAT_QSTAT("packets", packets),
 155         VIRTNET_RQ_STAT_QSTAT("bytes",   bytes),
 156 };
 157
 158 #define VIRTNET_STATS_DESC_CQ(name) \
 159         {#name, offsetof(struct virtio_net_stats_cvq, name), -1}
 160
 161 #define VIRTNET_STATS_DESC_RX(class, name) \
 162         {#name, offsetof(struct virtio_net_stats_rx_ ## class, rx_ ## name), -1}
 163
 164 #define VIRTNET_STATS_DESC_TX(class, name) \
 165         {#name, offsetof(struct virtio_net_stats_tx_ ## class, tx_ ## name), -1}
 166
 167
 168 static const struct virtnet_stat_desc virtnet_stats_cvq_desc[] = {
 169         VIRTNET_STATS_DESC_CQ(command_num),
 170         VIRTNET_STATS_DESC_CQ(ok_num),
 171 };
 172
 173 static const struct virtnet_stat_desc virtnet_stats_rx_basic_desc[] = {
 174         VIRTNET_STATS_DESC_RX(basic, packets),
 175         VIRTNET_STATS_DESC_RX(basic, bytes),
 176
 177         VIRTNET_STATS_DESC_RX(basic, notifications),
 178         VIRTNET_STATS_DESC_RX(basic, interrupts),
 179 };
 180
 181 static const struct virtnet_stat_desc virtnet_stats_tx_basic_desc[] = {
 182         VIRTNET_STATS_DESC_TX(basic, packets),
 183         VIRTNET_STATS_DESC_TX(basic, bytes),
 184
 185         VIRTNET_STATS_DESC_TX(basic, notifications),
 186         VIRTNET_STATS_DESC_TX(basic, interrupts),
 187 };
 188
 189 static const struct virtnet_stat_desc virtnet_stats_rx_csum_desc[] = {
 190         VIRTNET_STATS_DESC_RX(csum, needs_csum),
 191 };
 192
 193 static const struct virtnet_stat_desc virtnet_stats_tx_gso_desc[] = {
 194         VIRTNET_STATS_DESC_TX(gso, gso_packets_noseg),
 195         VIRTNET_STATS_DESC_TX(gso, gso_bytes_noseg),
 196 };
 197
 198 static const struct virtnet_stat_desc virtnet_stats_rx_speed_desc[] = {
 199         VIRTNET_STATS_DESC_RX(speed, ratelimit_bytes),
 200 };
 201
 202 static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc[] = {
 203         VIRTNET_STATS_DESC_TX(speed, ratelimit_bytes),
 204 };
 205
 206 #define VIRTNET_STATS_DESC_RX_QSTAT(class, name, qstat_field)                   \
 207         {                                                                       \
 208                 #name,                                                          \
 209                 offsetof(struct virtio_net_stats_rx_ ## class, rx_ ## name),    \
 210                 offsetof(struct netdev_queue_stats_rx, qstat_field),            \
 211         }
 212
 213 #define VIRTNET_STATS_DESC_TX_QSTAT(class, name, qstat_field)                   \
 214         {                                                                       \
 215                 #name,                                                          \
 216                 offsetof(struct virtio_net_stats_tx_ ## class, tx_ ## name),    \
 217                 offsetof(struct netdev_queue_stats_tx, qstat_field),            \
 218         }
 219
 220 static const struct virtnet_stat_desc virtnet_stats_rx_basic_desc_qstat[] = {
 221         VIRTNET_STATS_DESC_RX_QSTAT(basic, drops,         hw_drops),
 222         VIRTNET_STATS_DESC_RX_QSTAT(basic, drop_overruns, hw_drop_overruns),
 223 };
 224
 225 static const struct virtnet_stat_desc virtnet_stats_tx_basic_desc_qstat[] = {
 226         VIRTNET_STATS_DESC_TX_QSTAT(basic, drops,          hw_drops),
 227         VIRTNET_STATS_DESC_TX_QSTAT(basic, drop_malformed, hw_drop_errors),
 228 };
 229
 230 static const struct virtnet_stat_desc virtnet_stats_rx_csum_desc_qstat[] = {
 231         VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_valid, csum_unnecessary),
 232         VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_none,  csum_none),
 233         VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_bad,   csum_bad),
 234 };
 235
 236 static const struct virtnet_stat_desc virtnet_stats_tx_csum_desc_qstat[] = {
 237         VIRTNET_STATS_DESC_TX_QSTAT(csum, csum_none,  csum_none),
 238         VIRTNET_STATS_DESC_TX_QSTAT(csum, needs_csum, needs_csum),
 239 };
 240
 241 static const struct virtnet_stat_desc virtnet_stats_rx_gso_desc_qstat[] = {
 242         VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_packets,           hw_gro_packets),
 243         VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_bytes,             hw_gro_bytes),
 244         VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_packets_coalesced, hw_gro_wire_packets),
 245         VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_bytes_coalesced,   hw_gro_wire_bytes),
 246 };
 247
 248 static const struct virtnet_stat_desc virtnet_stats_tx_gso_desc_qstat[] = {
 249         VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_packets,        hw_gso_packets),
 250         VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_bytes,          hw_gso_bytes),
 251         VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_segments,       hw_gso_wire_packets),
 252         VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_segments_bytes, hw_gso_wire_bytes),
 253 };
 254
 255 static const struct virtnet_stat_desc virtnet_stats_rx_speed_desc_qstat[] = {
 256         VIRTNET_STATS_DESC_RX_QSTAT(speed, ratelimit_packets, hw_drop_ratelimits),
 257 };
 258
 259 static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc_qstat[] = {
 260         VIRTNET_STATS_DESC_TX_QSTAT(speed, ratelimit_packets, hw_drop_ratelimits),
 261 };
 262
 263 #define VIRTNET_Q_TYPE_RX 0
 264 #define VIRTNET_Q_TYPE_TX 1
 265 #define VIRTNET_Q_TYPE_CQ 2
 266
 267 struct virtnet_interrupt_coalesce {
 268         u32 max_packets;
 269         u32 max_usecs;
 270 };
 271
 272 /* The dma information of pages allocated at a time. */
 273 struct virtnet_rq_dma {
 274         dma_addr_t addr;
 275         u32 ref;
 276         u16 len;
 277         u16 need_sync;
 278 };
 279
 280 /* Internal representation of a send virtqueue */
 281 struct send_queue {
 282         /* Virtqueue associated with this send _queue */
 283         struct virtqueue *vq;
 284
 285         /* TX: fragments + linear part + virtio header */
 286         struct scatterlist sg[MAX_SKB_FRAGS + 2];
 287
 288         /* Name of the send queue: output.$index */
 289         char name[16];
 290
 291         struct virtnet_sq_stats stats;
 292
 293         struct virtnet_interrupt_coalesce intr_coal;
 294
 295         struct napi_struct napi;
 296
 297         /* Record whether sq is in reset state. */
 298         bool reset;
 299
 300         struct xsk_buff_pool *xsk_pool;
 301
 302         dma_addr_t xsk_hdr_dma_addr;
 303 };
 304
 305 /* Internal representation of a receive virtqueue */
 306 struct receive_queue {
 307         /* Virtqueue associated with this receive_queue */
 308         struct virtqueue *vq;
 309
 310         struct napi_struct napi;
 311
 312         struct bpf_prog __rcu *xdp_prog;
 313
 314         struct virtnet_rq_stats stats;
 315
 316         /* The number of rx notifications */
 317         u16 calls;
 318
 319         /* Is dynamic interrupt moderation enabled? */
 320         bool dim_enabled;
 321
 322         /* Used to protect dim_enabled and inter_coal */
 323         struct mutex dim_lock;
 324
 325         /* Dynamic Interrupt Moderation */
 326         struct dim dim;
 327
 328         u32 packets_in_napi;
 329
 330         struct virtnet_interrupt_coalesce intr_coal;
 331
 332         /* Chain pages by the private ptr. */
 333         struct page *pages;
 334
 335         /* Average packet length for mergeable receive buffers. */
 336         struct ewma_pkt_len mrg_avg_pkt_len;
 337
 338         /* Page frag for packet buffer allocation. */
 339         struct page_frag alloc_frag;
 340
 341         /* RX: fragments + linear part + virtio header */
 342         struct scatterlist sg[MAX_SKB_FRAGS + 2];
 343
 344         /* Min single buffer size for mergeable buffers case. */
 345         unsigned int min_buf_len;
 346
 347         /* Name of this receive queue: input.$index */
 348         char name[16];
 349
 350         struct xdp_rxq_info xdp_rxq;
 351
 352         /* Record the last dma info to free after new pages is allocated. */
 353         struct virtnet_rq_dma *last_dma;
 354
 355         struct xsk_buff_pool *xsk_pool;
 356
 357         /* xdp rxq used by xsk */
 358         struct xdp_rxq_info xsk_rxq_info;
 359
 360         struct xdp_buff **xsk_buffs;
 361 };
 362
 363 /* This structure can contain rss message with maximum settings for indirection table and keysize
 364  * Note, that default structure that describes RSS configuration virtio_net_rss_config
 365  * contains same info but can't handle table values.
 366  * In any case, structure would be passed to virtio hw through sg_buf split by parts
 367  * because table sizes may be differ according to the device configuration.
 368  */
 369 #define VIRTIO_NET_RSS_MAX_KEY_SIZE     40
 370 struct virtio_net_ctrl_rss {
 371         u32 hash_types;
 372         u16 indirection_table_mask;
 373         u16 unclassified_queue;
 374         u16 hash_cfg_reserved; /* for HASH_CONFIG (see virtio_net_hash_config for details) */
 375         u16 max_tx_vq;
 376         u8 hash_key_length;
 377         u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
 378
 379         u16 *indirection_table;
 380 };
 381
 382 /* Control VQ buffers: protected by the rtnl lock */
 383 struct control_buf {
 384         struct virtio_net_ctrl_hdr hdr;
 385         virtio_net_ctrl_ack status;
 386 };
 387
 388 struct virtnet_info {
 389         struct virtio_device *vdev;
 390         struct virtqueue *cvq;
 391         struct net_device *dev;
 392         struct send_queue *sq;
 393         struct receive_queue *rq;
 394         unsigned int status;
 395
 396         /* Max # of queue pairs supported by the device */
 397         u16 max_queue_pairs;
 398
 399         /* # of queue pairs currently used by the driver */
 400         u16 curr_queue_pairs;
 401
 402         /* # of XDP queue pairs currently used by the driver */
 403         u16 xdp_queue_pairs;
 404
 405         /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
 406         bool xdp_enabled;
 407
 408         /* I like... big packets and I cannot lie! */
 409         bool big_packets;
 410
 411         /* number of sg entries allocated for big packets */
 412         unsigned int big_packets_num_skbfrags;
 413
 414         /* Host will merge rx buffers for big packets (shake it! shake it!) */
 415         bool mergeable_rx_bufs;
 416
 417         /* Host supports rss and/or hash report */
 418         bool has_rss;
 419         bool has_rss_hash_report;
 420         u8 rss_key_size;
 421         u16 rss_indir_table_size;
 422         u32 rss_hash_types_supported;
 423         u32 rss_hash_types_saved;
 424         struct virtio_net_ctrl_rss rss;
 425
 426         /* Has control virtqueue */
 427         bool has_cvq;
 428
 429         /* Lock to protect the control VQ */
 430         struct mutex cvq_lock;
 431
 432         /* Host can handle any s/g split between our header and packet data */
 433         bool any_header_sg;
 434
 435         /* Packet virtio header size */
 436         u8 hdr_len;
 437
 438         /* Work struct for delayed refilling if we run low on memory. */
 439         struct delayed_work refill;
 440
 441         /* Is delayed refill enabled? */
 442         bool refill_enabled;
 443
 444         /* The lock to synchronize the access to refill_enabled */
 445         spinlock_t refill_lock;
 446
 447         /* Work struct for config space updates */
 448         struct work_struct config_work;
 449
 450         /* Work struct for setting rx mode */
 451         struct work_struct rx_mode_work;
 452
 453         /* OK to queue work setting RX mode? */
 454         bool rx_mode_work_enabled;
 455
 456         /* Does the affinity hint is set for virtqueues? */
 457         bool affinity_hint_set;
 458
 459         /* CPU hotplug instances for online & dead */
 460         struct hlist_node node;
 461         struct hlist_node node_dead;
 462
 463         struct control_buf *ctrl;
 464
 465         /* Ethtool settings */
 466         u8 duplex;
 467         u32 speed;
 468
 469         /* Is rx dynamic interrupt moderation enabled? */
 470         bool rx_dim_enabled;
 471
 472         /* Interrupt coalescing settings */
 473         struct virtnet_interrupt_coalesce intr_coal_tx;
 474         struct virtnet_interrupt_coalesce intr_coal_rx;
 475
 476         unsigned long guest_offloads;
 477         unsigned long guest_offloads_capable;
 478
 479         /* failover when STANDBY feature enabled */
 480         struct failover *failover;
 481
 482         u64 device_stats_cap;
 483 };
 484
 485 struct padded_vnet_hdr {
 486         struct virtio_net_hdr_v1_hash hdr;
 487         /*
 488          * hdr is in a separate sg buffer, and data sg buffer shares same page
 489          * with this header sg. This padding makes next sg 16 byte aligned
 490          * after the header.
 491          */
 492         char padding[12];
 493 };
 494
 495 struct virtio_net_common_hdr {
 496         union {
 497                 struct virtio_net_hdr hdr;
 498                 struct virtio_net_hdr_mrg_rxbuf mrg_hdr;
 499                 struct virtio_net_hdr_v1_hash hash_v1_hdr;
 500         };
 501 };
 502
 503 static struct virtio_net_common_hdr xsk_hdr;
 504
 505 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
 506 static void virtnet_sq_free_unused_buf_done(struct virtqueue *vq);
 507 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
 508                                struct net_device *dev,
 509                                unsigned int *xdp_xmit,
 510                                struct virtnet_rq_stats *stats);
 511 static void virtnet_receive_done(struct virtnet_info *vi, struct receive_queue *rq,
 512                                  struct sk_buff *skb, u8 flags);
 513 static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
 514                                                struct sk_buff *curr_skb,
 515                                                struct page *page, void *buf,
 516                                                int len, int truesize);
 517 static void virtnet_xsk_completed(struct send_queue *sq, int num);
 518
 519 enum virtnet_xmit_type {
 520         VIRTNET_XMIT_TYPE_SKB,
 521         VIRTNET_XMIT_TYPE_SKB_ORPHAN,
 522         VIRTNET_XMIT_TYPE_XDP,
 523         VIRTNET_XMIT_TYPE_XSK,
 524 };
 525
 526 static int rss_indirection_table_alloc(struct virtio_net_ctrl_rss *rss, u16 indir_table_size)
 527 {
 528         if (!indir_table_size) {
 529                 rss->indirection_table = NULL;
 530                 return 0;
 531         }
 532
 533         rss->indirection_table = kmalloc_array(indir_table_size, sizeof(u16), GFP_KERNEL);
 534         if (!rss->indirection_table)
 535                 return -ENOMEM;
 536
 537         return 0;
 538 }
 539
 540 static void rss_indirection_table_free(struct virtio_net_ctrl_rss *rss)
 541 {
 542         kfree(rss->indirection_table);
 543 }
 544
 545 /* We use the last two bits of the pointer to distinguish the xmit type. */
 546 #define VIRTNET_XMIT_TYPE_MASK (BIT(0) | BIT(1))
 547
 548 #define VIRTIO_XSK_FLAG_OFFSET 2
 549
 550 static enum virtnet_xmit_type virtnet_xmit_ptr_unpack(void **ptr)
 551 {
 552         unsigned long p = (unsigned long)*ptr;
 553
 554         *ptr = (void *)(p & ~VIRTNET_XMIT_TYPE_MASK);
 555
 556         return p & VIRTNET_XMIT_TYPE_MASK;
 557 }
 558
 559 static void *virtnet_xmit_ptr_pack(void *ptr, enum virtnet_xmit_type type)
 560 {
 561         return (void *)((unsigned long)ptr | type);
 562 }
 563
 564 static int virtnet_add_outbuf(struct send_queue *sq, int num, void *data,
 565                               enum virtnet_xmit_type type)
 566 {
 567         return virtqueue_add_outbuf(sq->vq, sq->sg, num,
 568                                     virtnet_xmit_ptr_pack(data, type),
 569                                     GFP_ATOMIC);
 570 }
 571
 572 static u32 virtnet_ptr_to_xsk_buff_len(void *ptr)
 573 {
 574         return ((unsigned long)ptr) >> VIRTIO_XSK_FLAG_OFFSET;
 575 }
 576
 577 static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
 578 {
 579         sg_dma_address(sg) = addr;
 580         sg_dma_len(sg) = len;
 581 }
 582
 583 static void __free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
 584                             bool in_napi, struct virtnet_sq_free_stats *stats)
 585 {
 586         struct xdp_frame *frame;
 587         struct sk_buff *skb;
 588         unsigned int len;
 589         void *ptr;
 590
 591         while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
 592                 switch (virtnet_xmit_ptr_unpack(&ptr)) {
 593                 case VIRTNET_XMIT_TYPE_SKB:
 594                         skb = ptr;
 595
 596                         pr_debug("Sent skb %p\n", skb);
 597                         stats->napi_packets++;
 598                         stats->napi_bytes += skb->len;
 599                         napi_consume_skb(skb, in_napi);
 600                         break;
 601
 602                 case VIRTNET_XMIT_TYPE_SKB_ORPHAN:
 603                         skb = ptr;
 604
 605                         stats->packets++;
 606                         stats->bytes += skb->len;
 607                         napi_consume_skb(skb, in_napi);
 608                         break;
 609
 610                 case VIRTNET_XMIT_TYPE_XDP:
 611                         frame = ptr;
 612
 613                         stats->packets++;
 614                         stats->bytes += xdp_get_frame_len(frame);
 615                         xdp_return_frame(frame);
 616                         break;
 617
 618                 case VIRTNET_XMIT_TYPE_XSK:
 619                         stats->bytes += virtnet_ptr_to_xsk_buff_len(ptr);
 620                         stats->xsk++;
 621                         break;
 622                 }
 623         }
 624         netdev_tx_completed_queue(txq, stats->napi_packets, stats->napi_bytes);
 625 }
 626
 627 static void virtnet_free_old_xmit(struct send_queue *sq,
 628                                   struct netdev_queue *txq,
 629                                   bool in_napi,
 630                                   struct virtnet_sq_free_stats *stats)
 631 {
 632         __free_old_xmit(sq, txq, in_napi, stats);
 633
 634         if (stats->xsk)
 635                 virtnet_xsk_completed(sq, stats->xsk);
 636 }
 637
 638 /* Converting between virtqueue no. and kernel tx/rx queue no.
 639  * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
 640  */
 641 static int vq2txq(struct virtqueue *vq)
 642 {
 643         return (vq->index - 1) / 2;
 644 }
 645
 646 static int txq2vq(int txq)
 647 {
 648         return txq * 2 + 1;
 649 }
 650
 651 static int vq2rxq(struct virtqueue *vq)
 652 {
 653         return vq->index / 2;
 654 }
 655
 656 static int rxq2vq(int rxq)
 657 {
 658         return rxq * 2;
 659 }
 660
 661 static int vq_type(struct virtnet_info *vi, int qid)
 662 {
 663         if (qid == vi->max_queue_pairs * 2)
 664                 return VIRTNET_Q_TYPE_CQ;
 665
 666         if (qid % 2)
 667                 return VIRTNET_Q_TYPE_TX;
 668
 669         return VIRTNET_Q_TYPE_RX;
 670 }
 671
 672 static inline struct virtio_net_common_hdr *
 673 skb_vnet_common_hdr(struct sk_buff *skb)
 674 {
 675         return (struct virtio_net_common_hdr *)skb->cb;
 676 }
 677
 678 /*
 679  * private is used to chain pages for big packets, put the whole
 680  * most recent used list in the beginning for reuse
 681  */
 682 static void give_pages(struct receive_queue *rq, struct page *page)
 683 {
 684         struct page *end;
 685
 686         /* Find end of list, sew whole thing into vi->rq.pages. */
 687         for (end = page; end->private; end = (struct page *)end->private);
 688         end->private = (unsigned long)rq->pages;
 689         rq->pages = page;
 690 }
 691
 692 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
 693 {
 694         struct page *p = rq->pages;
 695
 696         if (p) {
 697                 rq->pages = (struct page *)p->private;
 698                 /* clear private here, it is used to chain pages */
 699                 p->private = 0;
 700         } else
 701                 p = alloc_page(gfp_mask);
 702         return p;
 703 }
 704
 705 static void virtnet_rq_free_buf(struct virtnet_info *vi,
 706                                 struct receive_queue *rq, void *buf)
 707 {
 708         if (vi->mergeable_rx_bufs)
 709                 put_page(virt_to_head_page(buf));
 710         else if (vi->big_packets)
 711                 give_pages(rq, buf);
 712         else
 713                 put_page(virt_to_head_page(buf));
 714 }
 715
 716 static void enable_delayed_refill(struct virtnet_info *vi)
 717 {
 718         spin_lock_bh(&vi->refill_lock);
 719         vi->refill_enabled = true;
 720         spin_unlock_bh(&vi->refill_lock);
 721 }
 722
 723 static void disable_delayed_refill(struct virtnet_info *vi)
 724 {
 725         spin_lock_bh(&vi->refill_lock);
 726         vi->refill_enabled = false;
 727         spin_unlock_bh(&vi->refill_lock);
 728 }
 729
 730 static void enable_rx_mode_work(struct virtnet_info *vi)
 731 {
 732         rtnl_lock();
 733         vi->rx_mode_work_enabled = true;
 734         rtnl_unlock();
 735 }
 736
 737 static void disable_rx_mode_work(struct virtnet_info *vi)
 738 {
 739         rtnl_lock();
 740         vi->rx_mode_work_enabled = false;
 741         rtnl_unlock();
 742 }
 743
 744 static void virtqueue_napi_schedule(struct napi_struct *napi,
 745                                     struct virtqueue *vq)
 746 {
 747         if (napi_schedule_prep(napi)) {
 748                 virtqueue_disable_cb(vq);
 749                 __napi_schedule(napi);
 750         }
 751 }
 752
 753 static bool virtqueue_napi_complete(struct napi_struct *napi,
 754                                     struct virtqueue *vq, int processed)
 755 {
 756         int opaque;
 757
 758         opaque = virtqueue_enable_cb_prepare(vq);
 759         if (napi_complete_done(napi, processed)) {
 760                 if (unlikely(virtqueue_poll(vq, opaque)))
 761                         virtqueue_napi_schedule(napi, vq);
 762                 else
 763                         return true;
 764         } else {
 765                 virtqueue_disable_cb(vq);
 766         }
 767
 768         return false;
 769 }
 770
 771 static void skb_xmit_done(struct virtqueue *vq)
 772 {
 773         struct virtnet_info *vi = vq->vdev->priv;
 774         struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
 775
 776         /* Suppress further interrupts. */
 777         virtqueue_disable_cb(vq);
 778
 779         if (napi->weight)
 780                 virtqueue_napi_schedule(napi, vq);
 781         else
 782                 /* We were probably waiting for more output buffers. */
 783                 netif_wake_subqueue(vi->dev, vq2txq(vq));
 784 }
 785
 786 #define MRG_CTX_HEADER_SHIFT 22
 787 static void *mergeable_len_to_ctx(unsigned int truesize,
 788                                   unsigned int headroom)
 789 {
 790         return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
 791 }
 792
 793 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
 794 {
 795         return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
 796 }
 797
 798 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
 799 {
 800         return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
 801 }
 802
 803 static struct sk_buff *virtnet_build_skb(void *buf, unsigned int buflen,
 804                                          unsigned int headroom,
 805                                          unsigned int len)
 806 {
 807         struct sk_buff *skb;
 808
 809         skb = build_skb(buf, buflen);
 810         if (unlikely(!skb))
 811                 return NULL;
 812
 813         skb_reserve(skb, headroom);
 814         skb_put(skb, len);
 815
 816         return skb;
 817 }
 818
 819 /* Called from bottom half context */
 820 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 821                                    struct receive_queue *rq,
 822                                    struct page *page, unsigned int offset,
 823                                    unsigned int len, unsigned int truesize,
 824                                    unsigned int headroom)
 825 {
 826         struct sk_buff *skb;
 827         struct virtio_net_common_hdr *hdr;
 828         unsigned int copy, hdr_len, hdr_padded_len;
 829         struct page *page_to_free = NULL;
 830         int tailroom, shinfo_size;
 831         char *p, *hdr_p, *buf;
 832
 833         p = page_address(page) + offset;
 834         hdr_p = p;
 835
 836         hdr_len = vi->hdr_len;
 837         if (vi->mergeable_rx_bufs)
 838                 hdr_padded_len = hdr_len;
 839         else
 840                 hdr_padded_len = sizeof(struct padded_vnet_hdr);
 841
 842         buf = p - headroom;
 843         len -= hdr_len;
 844         offset += hdr_padded_len;
 845         p += hdr_padded_len;
 846         tailroom = truesize - headroom  - hdr_padded_len - len;
 847
 848         shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 849
 850         if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
 851                 skb = virtnet_build_skb(buf, truesize, p - buf, len);
 852                 if (unlikely(!skb))
 853                         return NULL;
 854
 855                 page = (struct page *)page->private;
 856                 if (page)
 857                         give_pages(rq, page);
 858                 goto ok;
 859         }
 860
 861         /* copy small packet so we can reuse these pages for small data */
 862         skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
 863         if (unlikely(!skb))
 864                 return NULL;
 865
 866         /* Copy all frame if it fits skb->head, otherwise
 867          * we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
 868          */
 869         if (len <= skb_tailroom(skb))
 870                 copy = len;
 871         else
 872                 copy = ETH_HLEN;
 873         skb_put_data(skb, p, copy);
 874
 875         len -= copy;
 876         offset += copy;
 877
 878         if (vi->mergeable_rx_bufs) {
 879                 if (len)
 880                         skb_add_rx_frag(skb, 0, page, offset, len, truesize);
 881                 else
 882                         page_to_free = page;
 883                 goto ok;
 884         }
 885
 886         /*
 887          * Verify that we can indeed put this data into a skb.
 888          * This is here to handle cases when the device erroneously
 889          * tries to receive more than is possible. This is usually
 890          * the case of a broken device.
 891          */
 892         if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
 893                 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
 894                 dev_kfree_skb(skb);
 895                 return NULL;
 896         }
 897         BUG_ON(offset >= PAGE_SIZE);
 898         while (len) {
 899                 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
 900                 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
 901                                 frag_size, truesize);
 902                 len -= frag_size;
 903                 page = (struct page *)page->private;
 904                 offset = 0;
 905         }
 906
 907         if (page)
 908                 give_pages(rq, page);
 909
 910 ok:
 911         hdr = skb_vnet_common_hdr(skb);
 912         memcpy(hdr, hdr_p, hdr_len);
 913         if (page_to_free)
 914                 put_page(page_to_free);
 915
 916         return skb;
 917 }
 918
 919 static void virtnet_rq_unmap(struct receive_queue *rq, void *buf, u32 len)
 920 {
 921         struct virtnet_info *vi = rq->vq->vdev->priv;
 922         struct page *page = virt_to_head_page(buf);
 923         struct virtnet_rq_dma *dma;
 924         void *head;
 925         int offset;
 926
 927         BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
 928
 929         head = page_address(page);
 930
 931         dma = head;
 932
 933         --dma->ref;
 934
 935         if (dma->need_sync && len) {
 936                 offset = buf - (head + sizeof(*dma));
 937
 938                 virtqueue_dma_sync_single_range_for_cpu(rq->vq, dma->addr,
 939                                                         offset, len,
 940                                                         DMA_FROM_DEVICE);
 941         }
 942
 943         if (dma->ref)
 944                 return;
 945
 946         virtqueue_dma_unmap_single_attrs(rq->vq, dma->addr, dma->len,
 947                                          DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
 948         put_page(page);
 949 }
 950
 951 static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx)
 952 {
 953         struct virtnet_info *vi = rq->vq->vdev->priv;
 954         void *buf;
 955
 956         BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
 957
 958         buf = virtqueue_get_buf_ctx(rq->vq, len, ctx);
 959         if (buf)
 960                 virtnet_rq_unmap(rq, buf, *len);
 961
 962         return buf;
 963 }
 964
 965 static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len)
 966 {
 967         struct virtnet_info *vi = rq->vq->vdev->priv;
 968         struct virtnet_rq_dma *dma;
 969         dma_addr_t addr;
 970         u32 offset;
 971         void *head;
 972
 973         BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
 974
 975         head = page_address(rq->alloc_frag.page);
 976
 977         offset = buf - head;
 978
 979         dma = head;
 980
 981         addr = dma->addr - sizeof(*dma) + offset;
 982
 983         sg_init_table(rq->sg, 1);
 984         sg_fill_dma(rq->sg, addr, len);
 985 }
 986
 987 static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
 988 {
 989         struct page_frag *alloc_frag = &rq->alloc_frag;
 990         struct virtnet_info *vi = rq->vq->vdev->priv;
 991         struct virtnet_rq_dma *dma;
 992         void *buf, *head;
 993         dma_addr_t addr;
 994
 995         BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
 996
 997         head = page_address(alloc_frag->page);
 998
 999         dma = head;
1000
1001         /* new pages */
1002         if (!alloc_frag->offset) {
1003                 if (rq->last_dma) {
1004                         /* Now, the new page is allocated, the last dma
1005                          * will not be used. So the dma can be unmapped
1006                          * if the ref is 0.
1007                          */
1008                         virtnet_rq_unmap(rq, rq->last_dma, 0);
1009                         rq->last_dma = NULL;
1010                 }
1011
1012                 dma->len = alloc_frag->size - sizeof(*dma);
1013
1014                 addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1,
1015                                                       dma->len, DMA_FROM_DEVICE, 0);
1016                 if (virtqueue_dma_mapping_error(rq->vq, addr))
1017                         return NULL;
1018
1019                 dma->addr = addr;
1020                 dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr);
1021
1022                 /* Add a reference to dma to prevent the entire dma from
1023                  * being released during error handling. This reference
1024                  * will be freed after the pages are no longer used.
1025                  */
1026                 get_page(alloc_frag->page);
1027                 dma->ref = 1;
1028                 alloc_frag->offset = sizeof(*dma);
1029
1030                 rq->last_dma = dma;
1031         }
1032
1033         ++dma->ref;
1034
1035         buf = head + alloc_frag->offset;
1036
1037         get_page(alloc_frag->page);
1038         alloc_frag->offset += size;
1039
1040         return buf;
1041 }
1042
1043 static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
1044 {
1045         struct virtnet_info *vi = vq->vdev->priv;
1046         struct receive_queue *rq;
1047         int i = vq2rxq(vq);
1048
1049         rq = &vi->rq[i];
1050
1051         if (rq->xsk_pool) {
1052                 xsk_buff_free((struct xdp_buff *)buf);
1053                 return;
1054         }
1055
1056         if (!vi->big_packets || vi->mergeable_rx_bufs)
1057                 virtnet_rq_unmap(rq, buf, 0);
1058
1059         virtnet_rq_free_buf(vi, rq, buf);
1060 }
1061
1062 static void free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
1063                           bool in_napi)
1064 {
1065         struct virtnet_sq_free_stats stats = {0};
1066
1067         virtnet_free_old_xmit(sq, txq, in_napi, &stats);
1068
1069         /* Avoid overhead when no packets have been processed
1070          * happens when called speculatively from start_xmit.
1071          */
1072         if (!stats.packets && !stats.napi_packets)
1073                 return;
1074
1075         u64_stats_update_begin(&sq->stats.syncp);
1076         u64_stats_add(&sq->stats.bytes, stats.bytes + stats.napi_bytes);
1077         u64_stats_add(&sq->stats.packets, stats.packets + stats.napi_packets);
1078         u64_stats_update_end(&sq->stats.syncp);
1079 }
1080
1081 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1082 {
1083         if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1084                 return false;
1085         else if (q < vi->curr_queue_pairs)
1086                 return true;
1087         else
1088                 return false;
1089 }
1090
1091 static void check_sq_full_and_disable(struct virtnet_info *vi,
1092                                       struct net_device *dev,
1093                                       struct send_queue *sq)
1094 {
1095         bool use_napi = sq->napi.weight;
1096         int qnum;
1097
1098         qnum = sq - vi->sq;
1099
1100         /* If running out of space, stop queue to avoid getting packets that we
1101          * are then unable to transmit.
1102          * An alternative would be to force queuing layer to requeue the skb by
1103          * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1104          * returned in a normal path of operation: it means that driver is not
1105          * maintaining the TX queue stop/start state properly, and causes
1106          * the stack to do a non-trivial amount of useless work.
1107          * Since most packets only take 1 or 2 ring slots, stopping the queue
1108          * early means 16 slots are typically wasted.
1109          */
1110         if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1111                 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1112
1113                 netif_tx_stop_queue(txq);
1114                 u64_stats_update_begin(&sq->stats.syncp);
1115                 u64_stats_inc(&sq->stats.stop);
1116                 u64_stats_update_end(&sq->stats.syncp);
1117                 if (use_napi) {
1118                         if (unlikely(!virtqueue_enable_cb_delayed(sq->vq)))
1119                                 virtqueue_napi_schedule(&sq->napi, sq->vq);
1120                 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1121                         /* More just got used, free them then recheck. */
1122                         free_old_xmit(sq, txq, false);
1123                         if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1124                                 netif_start_subqueue(dev, qnum);
1125                                 u64_stats_update_begin(&sq->stats.syncp);
1126                                 u64_stats_inc(&sq->stats.wake);
1127                                 u64_stats_update_end(&sq->stats.syncp);
1128                                 virtqueue_disable_cb(sq->vq);
1129                         }
1130                 }
1131         }
1132 }
1133
1134 static struct xdp_buff *buf_to_xdp(struct virtnet_info *vi,
1135                                    struct receive_queue *rq, void *buf, u32 len)
1136 {
1137         struct xdp_buff *xdp;
1138         u32 bufsize;
1139
1140         xdp = (struct xdp_buff *)buf;
1141
1142         bufsize = xsk_pool_get_rx_frame_size(rq->xsk_pool) + vi->hdr_len;
1143
1144         if (unlikely(len > bufsize)) {
1145                 pr_debug("%s: rx error: len %u exceeds truesize %u\n",
1146                          vi->dev->name, len, bufsize);
1147                 DEV_STATS_INC(vi->dev, rx_length_errors);
1148                 xsk_buff_free(xdp);
1149                 return NULL;
1150         }
1151
1152         xsk_buff_set_size(xdp, len);
1153         xsk_buff_dma_sync_for_cpu(xdp);
1154
1155         return xdp;
1156 }
1157
1158 static struct sk_buff *xsk_construct_skb(struct receive_queue *rq,
1159                                          struct xdp_buff *xdp)
1160 {
1161         unsigned int metasize = xdp->data - xdp->data_meta;
1162         struct sk_buff *skb;
1163         unsigned int size;
1164
1165         size = xdp->data_end - xdp->data_hard_start;
1166         skb = napi_alloc_skb(&rq->napi, size);
1167         if (unlikely(!skb)) {
1168                 xsk_buff_free(xdp);
1169                 return NULL;
1170         }
1171
1172         skb_reserve(skb, xdp->data_meta - xdp->data_hard_start);
1173
1174         size = xdp->data_end - xdp->data_meta;
1175         memcpy(__skb_put(skb, size), xdp->data_meta, size);
1176
1177         if (metasize) {
1178                 __skb_pull(skb, metasize);
1179                 skb_metadata_set(skb, metasize);
1180         }
1181
1182         xsk_buff_free(xdp);
1183
1184         return skb;
1185 }
1186
1187 static struct sk_buff *virtnet_receive_xsk_small(struct net_device *dev, struct virtnet_info *vi,
1188                                                  struct receive_queue *rq, struct xdp_buff *xdp,
1189                                                  unsigned int *xdp_xmit,
1190                                                  struct virtnet_rq_stats *stats)
1191 {
1192         struct bpf_prog *prog;
1193         u32 ret;
1194
1195         ret = XDP_PASS;
1196         rcu_read_lock();
1197         prog = rcu_dereference(rq->xdp_prog);
1198         if (prog)
1199                 ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats);
1200         rcu_read_unlock();
1201
1202         switch (ret) {
1203         case XDP_PASS:
1204                 return xsk_construct_skb(rq, xdp);
1205
1206         case XDP_TX:
1207         case XDP_REDIRECT:
1208                 return NULL;
1209
1210         default:
1211                 /* drop packet */
1212                 xsk_buff_free(xdp);
1213                 u64_stats_inc(&stats->drops);
1214                 return NULL;
1215         }
1216 }
1217
1218 static void xsk_drop_follow_bufs(struct net_device *dev,
1219                                  struct receive_queue *rq,
1220                                  u32 num_buf,
1221                                  struct virtnet_rq_stats *stats)
1222 {
1223         struct xdp_buff *xdp;
1224         u32 len;
1225
1226         while (num_buf-- > 1) {
1227                 xdp = virtqueue_get_buf(rq->vq, &len);
1228                 if (unlikely(!xdp)) {
1229                         pr_debug("%s: rx error: %d buffers missing\n",
1230                                  dev->name, num_buf);
1231                         DEV_STATS_INC(dev, rx_length_errors);
1232                         break;
1233                 }
1234                 u64_stats_add(&stats->bytes, len);
1235                 xsk_buff_free(xdp);
1236         }
1237 }
1238
1239 static int xsk_append_merge_buffer(struct virtnet_info *vi,
1240                                    struct receive_queue *rq,
1241                                    struct sk_buff *head_skb,
1242                                    u32 num_buf,
1243                                    struct virtio_net_hdr_mrg_rxbuf *hdr,
1244                                    struct virtnet_rq_stats *stats)
1245 {
1246         struct sk_buff *curr_skb;
1247         struct xdp_buff *xdp;
1248         u32 len, truesize;
1249         struct page *page;
1250         void *buf;
1251
1252         curr_skb = head_skb;
1253
1254         while (--num_buf) {
1255                 buf = virtqueue_get_buf(rq->vq, &len);
1256                 if (unlikely(!buf)) {
1257                         pr_debug("%s: rx error: %d buffers out of %d missing\n",
1258                                  vi->dev->name, num_buf,
1259                                  virtio16_to_cpu(vi->vdev,
1260                                                  hdr->num_buffers));
1261                         DEV_STATS_INC(vi->dev, rx_length_errors);
1262                         return -EINVAL;
1263                 }
1264
1265                 u64_stats_add(&stats->bytes, len);
1266
1267                 xdp = buf_to_xdp(vi, rq, buf, len);
1268                 if (!xdp)
1269                         goto err;
1270
1271                 buf = napi_alloc_frag(len);
1272                 if (!buf) {
1273                         xsk_buff_free(xdp);
1274                         goto err;
1275                 }
1276
1277                 memcpy(buf, xdp->data - vi->hdr_len, len);
1278
1279                 xsk_buff_free(xdp);
1280
1281                 page = virt_to_page(buf);
1282
1283                 truesize = len;
1284
1285                 curr_skb  = virtnet_skb_append_frag(head_skb, curr_skb, page,
1286                                                     buf, len, truesize);
1287                 if (!curr_skb) {
1288                         put_page(page);
1289                         goto err;
1290                 }
1291         }
1292
1293         return 0;
1294
1295 err:
1296         xsk_drop_follow_bufs(vi->dev, rq, num_buf, stats);
1297         return -EINVAL;
1298 }
1299
1300 static struct sk_buff *virtnet_receive_xsk_merge(struct net_device *dev, struct virtnet_info *vi,
1301                                                  struct receive_queue *rq, struct xdp_buff *xdp,
1302                                                  unsigned int *xdp_xmit,
1303                                                  struct virtnet_rq_stats *stats)
1304 {
1305         struct virtio_net_hdr_mrg_rxbuf *hdr;
1306         struct bpf_prog *prog;
1307         struct sk_buff *skb;
1308         u32 ret, num_buf;
1309
1310         hdr = xdp->data - vi->hdr_len;
1311         num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
1312
1313         ret = XDP_PASS;
1314         rcu_read_lock();
1315         prog = rcu_dereference(rq->xdp_prog);
1316         /* TODO: support multi buffer. */
1317         if (prog && num_buf == 1)
1318                 ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats);
1319         rcu_read_unlock();
1320
1321         switch (ret) {
1322         case XDP_PASS:
1323                 skb = xsk_construct_skb(rq, xdp);
1324                 if (!skb)
1325                         goto drop_bufs;
1326
1327                 if (xsk_append_merge_buffer(vi, rq, skb, num_buf, hdr, stats)) {
1328                         dev_kfree_skb(skb);
1329                         goto drop;
1330                 }
1331
1332                 return skb;
1333
1334         case XDP_TX:
1335         case XDP_REDIRECT:
1336                 return NULL;
1337
1338         default:
1339                 /* drop packet */
1340                 xsk_buff_free(xdp);
1341         }
1342
1343 drop_bufs:
1344         xsk_drop_follow_bufs(dev, rq, num_buf, stats);
1345
1346 drop:
1347         u64_stats_inc(&stats->drops);
1348         return NULL;
1349 }
1350
1351 static void virtnet_receive_xsk_buf(struct virtnet_info *vi, struct receive_queue *rq,
1352                                     void *buf, u32 len,
1353                                     unsigned int *xdp_xmit,
1354                                     struct virtnet_rq_stats *stats)
1355 {
1356         struct net_device *dev = vi->dev;
1357         struct sk_buff *skb = NULL;
1358         struct xdp_buff *xdp;
1359         u8 flags;
1360
1361         len -= vi->hdr_len;
1362
1363         u64_stats_add(&stats->bytes, len);
1364
1365         xdp = buf_to_xdp(vi, rq, buf, len);
1366         if (!xdp)
1367                 return;
1368
1369         if (unlikely(len < ETH_HLEN)) {
1370                 pr_debug("%s: short packet %i\n", dev->name, len);
1371                 DEV_STATS_INC(dev, rx_length_errors);
1372                 xsk_buff_free(xdp);
1373                 return;
1374         }
1375
1376         flags = ((struct virtio_net_common_hdr *)(xdp->data - vi->hdr_len))->hdr.flags;
1377
1378         if (!vi->mergeable_rx_bufs)
1379                 skb = virtnet_receive_xsk_small(dev, vi, rq, xdp, xdp_xmit, stats);
1380         else
1381                 skb = virtnet_receive_xsk_merge(dev, vi, rq, xdp, xdp_xmit, stats);
1382
1383         if (skb)
1384                 virtnet_receive_done(vi, rq, skb, flags);
1385 }
1386
1387 static int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue *rq,
1388                                    struct xsk_buff_pool *pool, gfp_t gfp)
1389 {
1390         struct xdp_buff **xsk_buffs;
1391         dma_addr_t addr;
1392         int err = 0;
1393         u32 len, i;
1394         int num;
1395
1396         xsk_buffs = rq->xsk_buffs;
1397
1398         num = xsk_buff_alloc_batch(pool, xsk_buffs, rq->vq->num_free);
1399         if (!num)
1400                 return -ENOMEM;
1401
1402         len = xsk_pool_get_rx_frame_size(pool) + vi->hdr_len;
1403
1404         for (i = 0; i < num; ++i) {
1405                 /* Use the part of XDP_PACKET_HEADROOM as the virtnet hdr space.
1406                  * We assume XDP_PACKET_HEADROOM is larger than hdr->len.
1407                  * (see function virtnet_xsk_pool_enable)
1408                  */
1409                 addr = xsk_buff_xdp_get_dma(xsk_buffs[i]) - vi->hdr_len;
1410
1411                 sg_init_table(rq->sg, 1);
1412                 sg_fill_dma(rq->sg, addr, len);
1413
1414                 err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1,
1415                                                     xsk_buffs[i], NULL, gfp);
1416                 if (err)
1417                         goto err;
1418         }
1419
1420         return num;
1421
1422 err:
1423         for (; i < num; ++i)
1424                 xsk_buff_free(xsk_buffs[i]);
1425
1426         return err;
1427 }
1428
1429 static void *virtnet_xsk_to_ptr(u32 len)
1430 {
1431         unsigned long p;
1432
1433         p = len << VIRTIO_XSK_FLAG_OFFSET;
1434
1435         return virtnet_xmit_ptr_pack((void *)p, VIRTNET_XMIT_TYPE_XSK);
1436 }
1437
1438 static int virtnet_xsk_xmit_one(struct send_queue *sq,
1439                                 struct xsk_buff_pool *pool,
1440                                 struct xdp_desc *desc)
1441 {
1442         struct virtnet_info *vi;
1443         dma_addr_t addr;
1444
1445         vi = sq->vq->vdev->priv;
1446
1447         addr = xsk_buff_raw_get_dma(pool, desc->addr);
1448         xsk_buff_raw_dma_sync_for_device(pool, addr, desc->len);
1449
1450         sg_init_table(sq->sg, 2);
1451         sg_fill_dma(sq->sg, sq->xsk_hdr_dma_addr, vi->hdr_len);
1452         sg_fill_dma(sq->sg + 1, addr, desc->len);
1453
1454         return virtqueue_add_outbuf_premapped(sq->vq, sq->sg, 2,
1455                                               virtnet_xsk_to_ptr(desc->len),
1456                                               GFP_ATOMIC);
1457 }
1458
1459 static int virtnet_xsk_xmit_batch(struct send_queue *sq,
1460                                   struct xsk_buff_pool *pool,
1461                                   unsigned int budget,
1462                                   u64 *kicks)
1463 {
1464         struct xdp_desc *descs = pool->tx_descs;
1465         bool kick = false;
1466         u32 nb_pkts, i;
1467         int err;
1468
1469         budget = min_t(u32, budget, sq->vq->num_free);
1470
1471         nb_pkts = xsk_tx_peek_release_desc_batch(pool, budget);
1472         if (!nb_pkts)
1473                 return 0;
1474
1475         for (i = 0; i < nb_pkts; i++) {
1476                 err = virtnet_xsk_xmit_one(sq, pool, &descs[i]);
1477                 if (unlikely(err)) {
1478                         xsk_tx_completed(sq->xsk_pool, nb_pkts - i);
1479                         break;
1480                 }
1481
1482                 kick = true;
1483         }
1484
1485         if (kick && virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
1486                 (*kicks)++;
1487
1488         return i;
1489 }
1490
1491 static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
1492                              int budget)
1493 {
1494         struct virtnet_info *vi = sq->vq->vdev->priv;
1495         struct virtnet_sq_free_stats stats = {};
1496         struct net_device *dev = vi->dev;
1497         u64 kicks = 0;
1498         int sent;
1499
1500         /* Avoid to wakeup napi meanless, so call __free_old_xmit instead of
1501          * free_old_xmit().
1502          */
1503         __free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq), true, &stats);
1504
1505         if (stats.xsk)
1506                 xsk_tx_completed(sq->xsk_pool, stats.xsk);
1507
1508         sent = virtnet_xsk_xmit_batch(sq, pool, budget, &kicks);
1509
1510         if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
1511                 check_sq_full_and_disable(vi, vi->dev, sq);
1512
1513         if (sent) {
1514                 struct netdev_queue *txq;
1515
1516                 txq = netdev_get_tx_queue(vi->dev, sq - vi->sq);
1517                 txq_trans_cond_update(txq);
1518         }
1519
1520         u64_stats_update_begin(&sq->stats.syncp);
1521         u64_stats_add(&sq->stats.packets, stats.packets);
1522         u64_stats_add(&sq->stats.bytes,   stats.bytes);
1523         u64_stats_add(&sq->stats.kicks,   kicks);
1524         u64_stats_add(&sq->stats.xdp_tx,  sent);
1525         u64_stats_update_end(&sq->stats.syncp);
1526
1527         if (xsk_uses_need_wakeup(pool))
1528                 xsk_set_tx_need_wakeup(pool);
1529
1530         return sent;
1531 }
1532
1533 static void xsk_wakeup(struct send_queue *sq)
1534 {
1535         if (napi_if_scheduled_mark_missed(&sq->napi))
1536                 return;
1537
1538         local_bh_disable();
1539         virtqueue_napi_schedule(&sq->napi, sq->vq);
1540         local_bh_enable();
1541 }
1542
1543 static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
1544 {
1545         struct virtnet_info *vi = netdev_priv(dev);
1546         struct send_queue *sq;
1547
1548         if (!netif_running(dev))
1549                 return -ENETDOWN;
1550
1551         if (qid >= vi->curr_queue_pairs)
1552                 return -EINVAL;
1553
1554         sq = &vi->sq[qid];
1555
1556         xsk_wakeup(sq);
1557         return 0;
1558 }
1559
1560 static void virtnet_xsk_completed(struct send_queue *sq, int num)
1561 {
1562         xsk_tx_completed(sq->xsk_pool, num);
1563
1564         /* If this is called by rx poll, start_xmit and xdp xmit we should
1565          * wakeup the tx napi to consume the xsk tx queue, because the tx
1566          * interrupt may not be triggered.
1567          */
1568         xsk_wakeup(sq);
1569 }
1570
1571 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
1572                                    struct send_queue *sq,
1573                                    struct xdp_frame *xdpf)
1574 {
1575         struct virtio_net_hdr_mrg_rxbuf *hdr;
1576         struct skb_shared_info *shinfo;
1577         u8 nr_frags = 0;
1578         int err, i;
1579
1580         if (unlikely(xdpf->headroom < vi->hdr_len))
1581                 return -EOVERFLOW;
1582
1583         if (unlikely(xdp_frame_has_frags(xdpf))) {
1584                 shinfo = xdp_get_shared_info_from_frame(xdpf);
1585                 nr_frags = shinfo->nr_frags;
1586         }
1587
1588         /* In wrapping function virtnet_xdp_xmit(), we need to free
1589          * up the pending old buffers, where we need to calculate the
1590          * position of skb_shared_info in xdp_get_frame_len() and
1591          * xdp_return_frame(), which will involve to xdpf->data and
1592          * xdpf->headroom. Therefore, we need to update the value of
1593          * headroom synchronously here.
1594          */
1595         xdpf->headroom -= vi->hdr_len;
1596         xdpf->data -= vi->hdr_len;
1597         /* Zero header and leave csum up to XDP layers */
1598         hdr = xdpf->data;
1599         memset(hdr, 0, vi->hdr_len);
1600         xdpf->len   += vi->hdr_len;
1601
1602         sg_init_table(sq->sg, nr_frags + 1);
1603         sg_set_buf(sq->sg, xdpf->data, xdpf->len);
1604         for (i = 0; i < nr_frags; i++) {
1605                 skb_frag_t *frag = &shinfo->frags[i];
1606
1607                 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag),
1608                             skb_frag_size(frag), skb_frag_off(frag));
1609         }
1610
1611         err = virtnet_add_outbuf(sq, nr_frags + 1, xdpf, VIRTNET_XMIT_TYPE_XDP);
1612         if (unlikely(err))
1613                 return -ENOSPC; /* Caller handle free/refcnt */
1614
1615         return 0;
1616 }
1617
1618 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on
1619  * the current cpu, so it does not need to be locked.
1620  *
1621  * Here we use marco instead of inline functions because we have to deal with
1622  * three issues at the same time: 1. the choice of sq. 2. judge and execute the
1623  * lock/unlock of txq 3. make sparse happy. It is difficult for two inline
1624  * functions to perfectly solve these three problems at the same time.
1625  */
1626 #define virtnet_xdp_get_sq(vi) ({                                       \
1627         int cpu = smp_processor_id();                                   \
1628         struct netdev_queue *txq;                                       \
1629         typeof(vi) v = (vi);                                            \
1630         unsigned int qp;                                                \
1631                                                                         \
1632         if (v->curr_queue_pairs > nr_cpu_ids) {                         \
1633                 qp = v->curr_queue_pairs - v->xdp_queue_pairs;          \
1634                 qp += cpu;                                              \
1635                 txq = netdev_get_tx_queue(v->dev, qp);                  \
1636                 __netif_tx_acquire(txq);                                \
1637         } else {                                                        \
1638                 qp = cpu % v->curr_queue_pairs;                         \
1639                 txq = netdev_get_tx_queue(v->dev, qp);                  \
1640                 __netif_tx_lock(txq, cpu);                              \
1641         }                                                               \
1642         v->sq + qp;                                                     \
1643 })
1644
1645 #define virtnet_xdp_put_sq(vi, q) {                                     \
1646         struct netdev_queue *txq;                                       \
1647         typeof(vi) v = (vi);                                            \
1648                                                                         \
1649         txq = netdev_get_tx_queue(v->dev, (q) - v->sq);                 \
1650         if (v->curr_queue_pairs > nr_cpu_ids)                           \
1651                 __netif_tx_release(txq);                                \
1652         else                                                            \
1653                 __netif_tx_unlock(txq);                                 \
1654 }
1655
1656 static int virtnet_xdp_xmit(struct net_device *dev,
1657                             int n, struct xdp_frame **frames, u32 flags)
1658 {
1659         struct virtnet_info *vi = netdev_priv(dev);
1660         struct virtnet_sq_free_stats stats = {0};
1661         struct receive_queue *rq = vi->rq;
1662         struct bpf_prog *xdp_prog;
1663         struct send_queue *sq;
1664         int nxmit = 0;
1665         int kicks = 0;
1666         int ret;
1667         int i;
1668
1669         /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
1670          * indicate XDP resources have been successfully allocated.
1671          */
1672         xdp_prog = rcu_access_pointer(rq->xdp_prog);
1673         if (!xdp_prog)
1674                 return -ENXIO;
1675
1676         sq = virtnet_xdp_get_sq(vi);
1677
1678         if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
1679                 ret = -EINVAL;
1680                 goto out;
1681         }
1682
1683         /* Free up any pending old buffers before queueing new ones. */
1684         virtnet_free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq),
1685                               false, &stats);
1686
1687         for (i = 0; i < n; i++) {
1688                 struct xdp_frame *xdpf = frames[i];
1689
1690                 if (__virtnet_xdp_xmit_one(vi, sq, xdpf))
1691                         break;
1692                 nxmit++;
1693         }
1694         ret = nxmit;
1695
1696         if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
1697                 check_sq_full_and_disable(vi, dev, sq);
1698
1699         if (flags & XDP_XMIT_FLUSH) {
1700                 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
1701                         kicks = 1;
1702         }
1703 out:
1704         u64_stats_update_begin(&sq->stats.syncp);
1705         u64_stats_add(&sq->stats.bytes, stats.bytes);
1706         u64_stats_add(&sq->stats.packets, stats.packets);
1707         u64_stats_add(&sq->stats.xdp_tx, n);
1708         u64_stats_add(&sq->stats.xdp_tx_drops, n - nxmit);
1709         u64_stats_add(&sq->stats.kicks, kicks);
1710         u64_stats_update_end(&sq->stats.syncp);
1711
1712         virtnet_xdp_put_sq(vi, sq);
1713         return ret;
1714 }
1715
1716 static void put_xdp_frags(struct xdp_buff *xdp)
1717 {
1718         struct skb_shared_info *shinfo;
1719         struct page *xdp_page;
1720         int i;
1721
1722         if (xdp_buff_has_frags(xdp)) {
1723                 shinfo = xdp_get_shared_info_from_buff(xdp);
1724                 for (i = 0; i < shinfo->nr_frags; i++) {
1725                         xdp_page = skb_frag_page(&shinfo->frags[i]);
1726                         put_page(xdp_page);
1727                 }
1728         }
1729 }
1730
1731 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
1732                                struct net_device *dev,
1733                                unsigned int *xdp_xmit,
1734                                struct virtnet_rq_stats *stats)
1735 {
1736         struct xdp_frame *xdpf;
1737         int err;
1738         u32 act;
1739
1740         act = bpf_prog_run_xdp(xdp_prog, xdp);
1741         u64_stats_inc(&stats->xdp_packets);
1742
1743         switch (act) {
1744         case XDP_PASS:
1745                 return act;
1746
1747         case XDP_TX:
1748                 u64_stats_inc(&stats->xdp_tx);
1749                 xdpf = xdp_convert_buff_to_frame(xdp);
1750                 if (unlikely(!xdpf)) {
1751                         netdev_dbg(dev, "convert buff to frame failed for xdp\n");
1752                         return XDP_DROP;
1753                 }
1754
1755                 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
1756                 if (unlikely(!err)) {
1757                         xdp_return_frame_rx_napi(xdpf);
1758                 } else if (unlikely(err < 0)) {
1759                         trace_xdp_exception(dev, xdp_prog, act);
1760                         return XDP_DROP;
1761                 }
1762                 *xdp_xmit |= VIRTIO_XDP_TX;
1763                 return act;
1764
1765         case XDP_REDIRECT:
1766                 u64_stats_inc(&stats->xdp_redirects);
1767                 err = xdp_do_redirect(dev, xdp, xdp_prog);
1768                 if (err)
1769                         return XDP_DROP;
1770
1771                 *xdp_xmit |= VIRTIO_XDP_REDIR;
1772                 return act;
1773
1774         default:
1775                 bpf_warn_invalid_xdp_action(dev, xdp_prog, act);
1776                 fallthrough;
1777         case XDP_ABORTED:
1778                 trace_xdp_exception(dev, xdp_prog, act);
1779                 fallthrough;
1780         case XDP_DROP:
1781                 return XDP_DROP;
1782         }
1783 }
1784
1785 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
1786 {
1787         return vi->xdp_enabled ? XDP_PACKET_HEADROOM : 0;
1788 }
1789
1790 /* We copy the packet for XDP in the following cases:
1791  *
1792  * 1) Packet is scattered across multiple rx buffers.
1793  * 2) Headroom space is insufficient.
1794  *
1795  * This is inefficient but it's a temporary condition that
1796  * we hit right after XDP is enabled and until queue is refilled
1797  * with large buffers with sufficient headroom - so it should affect
1798  * at most queue size packets.
1799  * Afterwards, the conditions to enable
1800  * XDP should preclude the underlying device from sending packets
1801  * across multiple buffers (num_buf > 1), and we make sure buffers
1802  * have enough headroom.
1803  */
1804 static struct page *xdp_linearize_page(struct receive_queue *rq,
1805                                        int *num_buf,
1806                                        struct page *p,
1807                                        int offset,
1808                                        int page_off,
1809                                        unsigned int *len)
1810 {
1811         int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1812         struct page *page;
1813
1814         if (page_off + *len + tailroom > PAGE_SIZE)
1815                 return NULL;
1816
1817         page = alloc_page(GFP_ATOMIC);
1818         if (!page)
1819                 return NULL;
1820
1821         memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
1822         page_off += *len;
1823
1824         while (--*num_buf) {
1825                 unsigned int buflen;
1826                 void *buf;
1827                 int off;
1828
1829                 buf = virtnet_rq_get_buf(rq, &buflen, NULL);
1830                 if (unlikely(!buf))
1831                         goto err_buf;
1832
1833                 p = virt_to_head_page(buf);
1834                 off = buf - page_address(p);
1835
1836                 /* guard against a misconfigured or uncooperative backend that
1837                  * is sending packet larger than the MTU.
1838                  */
1839                 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
1840                         put_page(p);
1841                         goto err_buf;
1842                 }
1843
1844                 memcpy(page_address(page) + page_off,
1845                        page_address(p) + off, buflen);
1846                 page_off += buflen;
1847                 put_page(p);
1848         }
1849
1850         /* Headroom does not contribute to packet length */
1851         *len = page_off - XDP_PACKET_HEADROOM;
1852         return page;
1853 err_buf:
1854         __free_pages(page, 0);
1855         return NULL;
1856 }
1857
1858 static struct sk_buff *receive_small_build_skb(struct virtnet_info *vi,
1859                                                unsigned int xdp_headroom,
1860                                                void *buf,
1861                                                unsigned int len)
1862 {
1863         unsigned int header_offset;
1864         unsigned int headroom;
1865         unsigned int buflen;
1866         struct sk_buff *skb;
1867
1868         header_offset = VIRTNET_RX_PAD + xdp_headroom;
1869         headroom = vi->hdr_len + header_offset;
1870         buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1871                 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1872
1873         skb = virtnet_build_skb(buf, buflen, headroom, len);
1874         if (unlikely(!skb))
1875                 return NULL;
1876
1877         buf += header_offset;
1878         memcpy(skb_vnet_common_hdr(skb), buf, vi->hdr_len);
1879
1880         return skb;
1881 }
1882
1883 static struct sk_buff *receive_small_xdp(struct net_device *dev,
1884                                          struct virtnet_info *vi,
1885                                          struct receive_queue *rq,
1886                                          struct bpf_prog *xdp_prog,
1887                                          void *buf,
1888                                          unsigned int xdp_headroom,
1889                                          unsigned int len,
1890                                          unsigned int *xdp_xmit,
1891                                          struct virtnet_rq_stats *stats)
1892 {
1893         unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
1894         unsigned int headroom = vi->hdr_len + header_offset;
1895         struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
1896         struct page *page = virt_to_head_page(buf);
1897         struct page *xdp_page;
1898         unsigned int buflen;
1899         struct xdp_buff xdp;
1900         struct sk_buff *skb;
1901         unsigned int metasize = 0;
1902         u32 act;
1903
1904         if (unlikely(hdr->hdr.gso_type))
1905                 goto err_xdp;
1906
1907         /* Partially checksummed packets must be dropped. */
1908         if (unlikely(hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM))
1909                 goto err_xdp;
1910
1911         buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1912                 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1913
1914         if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
1915                 int offset = buf - page_address(page) + header_offset;
1916                 unsigned int tlen = len + vi->hdr_len;
1917                 int num_buf = 1;
1918
1919                 xdp_headroom = virtnet_get_headroom(vi);
1920                 header_offset = VIRTNET_RX_PAD + xdp_headroom;
1921                 headroom = vi->hdr_len + header_offset;
1922                 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1923                         SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1924                 xdp_page = xdp_linearize_page(rq, &num_buf, page,
1925                                               offset, header_offset,
1926                                               &tlen);
1927                 if (!xdp_page)
1928                         goto err_xdp;
1929
1930                 buf = page_address(xdp_page);
1931                 put_page(page);
1932                 page = xdp_page;
1933         }
1934
1935         xdp_init_buff(&xdp, buflen, &rq->xdp_rxq);
1936         xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
1937                          xdp_headroom, len, true);
1938
1939         act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
1940
1941         switch (act) {
1942         case XDP_PASS:
1943                 /* Recalculate length in case bpf program changed it */
1944                 len = xdp.data_end - xdp.data;
1945                 metasize = xdp.data - xdp.data_meta;
1946                 break;
1947
1948         case XDP_TX:
1949         case XDP_REDIRECT:
1950                 goto xdp_xmit;
1951
1952         default:
1953                 goto err_xdp;
1954         }
1955
1956         skb = virtnet_build_skb(buf, buflen, xdp.data - buf, len);
1957         if (unlikely(!skb))
1958                 goto err;
1959
1960         if (metasize)
1961                 skb_metadata_set(skb, metasize);
1962
1963         return skb;
1964
1965 err_xdp:
1966         u64_stats_inc(&stats->xdp_drops);
1967 err:
1968         u64_stats_inc(&stats->drops);
1969         put_page(page);
1970 xdp_xmit:
1971         return NULL;
1972 }
1973
1974 static struct sk_buff *receive_small(struct net_device *dev,
1975                                      struct virtnet_info *vi,
1976                                      struct receive_queue *rq,
1977                                      void *buf, void *ctx,
1978                                      unsigned int len,
1979                                      unsigned int *xdp_xmit,
1980                                      struct virtnet_rq_stats *stats)
1981 {
1982         unsigned int xdp_headroom = (unsigned long)ctx;
1983         struct page *page = virt_to_head_page(buf);
1984         struct sk_buff *skb;
1985
1986         /* We passed the address of virtnet header to virtio-core,
1987          * so truncate the padding.
1988          */
1989         buf -= VIRTNET_RX_PAD + xdp_headroom;
1990
1991         len -= vi->hdr_len;
1992         u64_stats_add(&stats->bytes, len);
1993
1994         if (unlikely(len > GOOD_PACKET_LEN)) {
1995                 pr_debug("%s: rx error: len %u exceeds max size %d\n",
1996                          dev->name, len, GOOD_PACKET_LEN);
1997                 DEV_STATS_INC(dev, rx_length_errors);
1998                 goto err;
1999         }
2000
2001         if (unlikely(vi->xdp_enabled)) {
2002                 struct bpf_prog *xdp_prog;
2003
2004                 rcu_read_lock();
2005                 xdp_prog = rcu_dereference(rq->xdp_prog);
2006                 if (xdp_prog) {
2007                         skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf,
2008                                                 xdp_headroom, len, xdp_xmit,
2009                                                 stats);
2010                         rcu_read_unlock();
2011                         return skb;
2012                 }
2013                 rcu_read_unlock();
2014         }
2015
2016         skb = receive_small_build_skb(vi, xdp_headroom, buf, len);
2017         if (likely(skb))
2018                 return skb;
2019
2020 err:
2021         u64_stats_inc(&stats->drops);
2022         put_page(page);
2023         return NULL;
2024 }
2025
2026 static struct sk_buff *receive_big(struct net_device *dev,
2027                                    struct virtnet_info *vi,
2028                                    struct receive_queue *rq,
2029                                    void *buf,
2030                                    unsigned int len,
2031                                    struct virtnet_rq_stats *stats)
2032 {
2033         struct page *page = buf;
2034         struct sk_buff *skb =
2035                 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0);
2036
2037         u64_stats_add(&stats->bytes, len - vi->hdr_len);
2038         if (unlikely(!skb))
2039                 goto err;
2040
2041         return skb;
2042
2043 err:
2044         u64_stats_inc(&stats->drops);
2045         give_pages(rq, page);
2046         return NULL;
2047 }
2048
2049 static void mergeable_buf_free(struct receive_queue *rq, int num_buf,
2050                                struct net_device *dev,
2051                                struct virtnet_rq_stats *stats)
2052 {
2053         struct page *page;
2054         void *buf;
2055         int len;
2056
2057         while (num_buf-- > 1) {
2058                 buf = virtnet_rq_get_buf(rq, &len, NULL);
2059                 if (unlikely(!buf)) {
2060                         pr_debug("%s: rx error: %d buffers missing\n",
2061                                  dev->name, num_buf);
2062                         DEV_STATS_INC(dev, rx_length_errors);
2063                         break;
2064                 }
2065                 u64_stats_add(&stats->bytes, len);
2066                 page = virt_to_head_page(buf);
2067                 put_page(page);
2068         }
2069 }
2070
2071 /* Why not use xdp_build_skb_from_frame() ?
2072  * XDP core assumes that xdp frags are PAGE_SIZE in length, while in
2073  * virtio-net there are 2 points that do not match its requirements:
2074  *  1. The size of the prefilled buffer is not fixed before xdp is set.
2075  *  2. xdp_build_skb_from_frame() does more checks that we don't need,
2076  *     like eth_type_trans() (which virtio-net does in receive_buf()).
2077  */
2078 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev,
2079                                                struct virtnet_info *vi,
2080                                                struct xdp_buff *xdp,
2081                                                unsigned int xdp_frags_truesz)
2082 {
2083         struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
2084         unsigned int headroom, data_len;
2085         struct sk_buff *skb;
2086         int metasize;
2087         u8 nr_frags;
2088
2089         if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
2090                 pr_debug("Error building skb as missing reserved tailroom for xdp");
2091                 return NULL;
2092         }
2093
2094         if (unlikely(xdp_buff_has_frags(xdp)))
2095                 nr_frags = sinfo->nr_frags;
2096
2097         skb = build_skb(xdp->data_hard_start, xdp->frame_sz);
2098         if (unlikely(!skb))
2099                 return NULL;
2100
2101         headroom = xdp->data - xdp->data_hard_start;
2102         data_len = xdp->data_end - xdp->data;
2103         skb_reserve(skb, headroom);
2104         __skb_put(skb, data_len);
2105
2106         metasize = xdp->data - xdp->data_meta;
2107         metasize = metasize > 0 ? metasize : 0;
2108         if (metasize)
2109                 skb_metadata_set(skb, metasize);
2110
2111         if (unlikely(xdp_buff_has_frags(xdp)))
2112                 xdp_update_skb_shared_info(skb, nr_frags,
2113                                            sinfo->xdp_frags_size,
2114                                            xdp_frags_truesz,
2115                                            xdp_buff_is_frag_pfmemalloc(xdp));
2116
2117         return skb;
2118 }
2119
2120 /* TODO: build xdp in big mode */
2121 static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
2122                                       struct virtnet_info *vi,
2123                                       struct receive_queue *rq,
2124                                       struct xdp_buff *xdp,
2125                                       void *buf,
2126                                       unsigned int len,
2127                                       unsigned int frame_sz,
2128                                       int *num_buf,
2129                                       unsigned int *xdp_frags_truesize,
2130                                       struct virtnet_rq_stats *stats)
2131 {
2132         struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2133         unsigned int headroom, tailroom, room;
2134         unsigned int truesize, cur_frag_size;
2135         struct skb_shared_info *shinfo;
2136         unsigned int xdp_frags_truesz = 0;
2137         struct page *page;
2138         skb_frag_t *frag;
2139         int offset;
2140         void *ctx;
2141
2142         xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq);
2143         xdp_prepare_buff(xdp, buf - XDP_PACKET_HEADROOM,
2144                          XDP_PACKET_HEADROOM + vi->hdr_len, len - vi->hdr_len, true);
2145
2146         if (!*num_buf)
2147                 return 0;
2148
2149         if (*num_buf > 1) {
2150                 /* If we want to build multi-buffer xdp, we need
2151                  * to specify that the flags of xdp_buff have the
2152                  * XDP_FLAGS_HAS_FRAG bit.
2153                  */
2154                 if (!xdp_buff_has_frags(xdp))
2155                         xdp_buff_set_frags_flag(xdp);
2156
2157                 shinfo = xdp_get_shared_info_from_buff(xdp);
2158                 shinfo->nr_frags = 0;
2159                 shinfo->xdp_frags_size = 0;
2160         }
2161
2162         if (*num_buf > MAX_SKB_FRAGS + 1)
2163                 return -EINVAL;
2164
2165         while (--*num_buf > 0) {
2166                 buf = virtnet_rq_get_buf(rq, &len, &ctx);
2167                 if (unlikely(!buf)) {
2168                         pr_debug("%s: rx error: %d buffers out of %d missing\n",
2169                                  dev->name, *num_buf,
2170                                  virtio16_to_cpu(vi->vdev, hdr->num_buffers));
2171                         DEV_STATS_INC(dev, rx_length_errors);
2172                         goto err;
2173                 }
2174
2175                 u64_stats_add(&stats->bytes, len);
2176                 page = virt_to_head_page(buf);
2177                 offset = buf - page_address(page);
2178
2179                 truesize = mergeable_ctx_to_truesize(ctx);
2180                 headroom = mergeable_ctx_to_headroom(ctx);
2181                 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2182                 room = SKB_DATA_ALIGN(headroom + tailroom);
2183
2184                 cur_frag_size = truesize;
2185                 xdp_frags_truesz += cur_frag_size;
2186                 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) {
2187                         put_page(page);
2188                         pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2189                                  dev->name, len, (unsigned long)(truesize - room));
2190                         DEV_STATS_INC(dev, rx_length_errors);
2191                         goto err;
2192                 }
2193
2194                 frag = &shinfo->frags[shinfo->nr_frags++];
2195                 skb_frag_fill_page_desc(frag, page, offset, len);
2196                 if (page_is_pfmemalloc(page))
2197                         xdp_buff_set_frag_pfmemalloc(xdp);
2198
2199                 shinfo->xdp_frags_size += len;
2200         }
2201
2202         *xdp_frags_truesize = xdp_frags_truesz;
2203         return 0;
2204
2205 err:
2206         put_xdp_frags(xdp);
2207         return -EINVAL;
2208 }
2209
2210 static void *mergeable_xdp_get_buf(struct virtnet_info *vi,
2211                                    struct receive_queue *rq,
2212                                    struct bpf_prog *xdp_prog,
2213                                    void *ctx,
2214                                    unsigned int *frame_sz,
2215                                    int *num_buf,
2216                                    struct page **page,
2217                                    int offset,
2218                                    unsigned int *len,
2219                                    struct virtio_net_hdr_mrg_rxbuf *hdr)
2220 {
2221         unsigned int truesize = mergeable_ctx_to_truesize(ctx);
2222         unsigned int headroom = mergeable_ctx_to_headroom(ctx);
2223         struct page *xdp_page;
2224         unsigned int xdp_room;
2225
2226         /* Transient failure which in theory could occur if
2227          * in-flight packets from before XDP was enabled reach
2228          * the receive path after XDP is loaded.
2229          */
2230         if (unlikely(hdr->hdr.gso_type))
2231                 return NULL;
2232
2233         /* Partially checksummed packets must be dropped. */
2234         if (unlikely(hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM))
2235                 return NULL;
2236
2237         /* Now XDP core assumes frag size is PAGE_SIZE, but buffers
2238          * with headroom may add hole in truesize, which
2239          * make their length exceed PAGE_SIZE. So we disabled the
2240          * hole mechanism for xdp. See add_recvbuf_mergeable().
2241          */
2242         *frame_sz = truesize;
2243
2244         if (likely(headroom >= virtnet_get_headroom(vi) &&
2245                    (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) {
2246                 return page_address(*page) + offset;
2247         }
2248
2249         /* This happens when headroom is not enough because
2250          * of the buffer was prefilled before XDP is set.
2251          * This should only happen for the first several packets.
2252          * In fact, vq reset can be used here to help us clean up
2253          * the prefilled buffers, but many existing devices do not
2254          * support it, and we don't want to bother users who are
2255          * using xdp normally.
2256          */
2257         if (!xdp_prog->aux->xdp_has_frags) {
2258                 /* linearize data for XDP */
2259                 xdp_page = xdp_linearize_page(rq, num_buf,
2260                                               *page, offset,
2261                                               XDP_PACKET_HEADROOM,
2262                                               len);
2263                 if (!xdp_page)
2264                         return NULL;
2265         } else {
2266                 xdp_room = SKB_DATA_ALIGN(XDP_PACKET_HEADROOM +
2267                                           sizeof(struct skb_shared_info));
2268                 if (*len + xdp_room > PAGE_SIZE)
2269                         return NULL;
2270
2271                 xdp_page = alloc_page(GFP_ATOMIC);
2272                 if (!xdp_page)
2273                         return NULL;
2274
2275                 memcpy(page_address(xdp_page) + XDP_PACKET_HEADROOM,
2276                        page_address(*page) + offset, *len);
2277         }
2278
2279         *frame_sz = PAGE_SIZE;
2280
2281         put_page(*page);
2282
2283         *page = xdp_page;
2284
2285         return page_address(*page) + XDP_PACKET_HEADROOM;
2286 }
2287
2288 static struct sk_buff *receive_mergeable_xdp(struct net_device *dev,
2289                                              struct virtnet_info *vi,
2290                                              struct receive_queue *rq,
2291                                              struct bpf_prog *xdp_prog,
2292                                              void *buf,
2293                                              void *ctx,
2294                                              unsigned int len,
2295                                              unsigned int *xdp_xmit,
2296                                              struct virtnet_rq_stats *stats)
2297 {
2298         struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2299         int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
2300         struct page *page = virt_to_head_page(buf);
2301         int offset = buf - page_address(page);
2302         unsigned int xdp_frags_truesz = 0;
2303         struct sk_buff *head_skb;
2304         unsigned int frame_sz;
2305         struct xdp_buff xdp;
2306         void *data;
2307         u32 act;
2308         int err;
2309
2310         data = mergeable_xdp_get_buf(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page,
2311                                      offset, &len, hdr);
2312         if (unlikely(!data))
2313                 goto err_xdp;
2314
2315         err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
2316                                          &num_buf, &xdp_frags_truesz, stats);
2317         if (unlikely(err))
2318                 goto err_xdp;
2319
2320         act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
2321
2322         switch (act) {
2323         case XDP_PASS:
2324                 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
2325                 if (unlikely(!head_skb))
2326                         break;
2327                 return head_skb;
2328
2329         case XDP_TX:
2330         case XDP_REDIRECT:
2331                 return NULL;
2332
2333         default:
2334                 break;
2335         }
2336
2337         put_xdp_frags(&xdp);
2338
2339 err_xdp:
2340         put_page(page);
2341         mergeable_buf_free(rq, num_buf, dev, stats);
2342
2343         u64_stats_inc(&stats->xdp_drops);
2344         u64_stats_inc(&stats->drops);
2345         return NULL;
2346 }
2347
2348 static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
2349                                                struct sk_buff *curr_skb,
2350                                                struct page *page, void *buf,
2351                                                int len, int truesize)
2352 {
2353         int num_skb_frags;
2354         int offset;
2355
2356         num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
2357         if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
2358                 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
2359
2360                 if (unlikely(!nskb))
2361                         return NULL;
2362
2363                 if (curr_skb == head_skb)
2364                         skb_shinfo(curr_skb)->frag_list = nskb;
2365                 else
2366                         curr_skb->next = nskb;
2367                 curr_skb = nskb;
2368                 head_skb->truesize += nskb->truesize;
2369                 num_skb_frags = 0;
2370         }
2371
2372         if (curr_skb != head_skb) {
2373                 head_skb->data_len += len;
2374                 head_skb->len += len;
2375                 head_skb->truesize += truesize;
2376         }
2377
2378         offset = buf - page_address(page);
2379         if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
2380                 put_page(page);
2381                 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
2382                                      len, truesize);
2383         } else {
2384                 skb_add_rx_frag(curr_skb, num_skb_frags, page,
2385                                 offset, len, truesize);
2386         }
2387
2388         return curr_skb;
2389 }
2390
2391 static struct sk_buff *receive_mergeable(struct net_device *dev,
2392                                          struct virtnet_info *vi,
2393                                          struct receive_queue *rq,
2394                                          void *buf,
2395                                          void *ctx,
2396                                          unsigned int len,
2397                                          unsigned int *xdp_xmit,
2398                                          struct virtnet_rq_stats *stats)
2399 {
2400         struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2401         int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
2402         struct page *page = virt_to_head_page(buf);
2403         int offset = buf - page_address(page);
2404         struct sk_buff *head_skb, *curr_skb;
2405         unsigned int truesize = mergeable_ctx_to_truesize(ctx);
2406         unsigned int headroom = mergeable_ctx_to_headroom(ctx);
2407         unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2408         unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
2409
2410         head_skb = NULL;
2411         u64_stats_add(&stats->bytes, len - vi->hdr_len);
2412
2413         if (unlikely(len > truesize - room)) {
2414                 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2415                          dev->name, len, (unsigned long)(truesize - room));
2416                 DEV_STATS_INC(dev, rx_length_errors);
2417                 goto err_skb;
2418         }
2419
2420         if (unlikely(vi->xdp_enabled)) {
2421                 struct bpf_prog *xdp_prog;
2422
2423                 rcu_read_lock();
2424                 xdp_prog = rcu_dereference(rq->xdp_prog);
2425                 if (xdp_prog) {
2426                         head_skb = receive_mergeable_xdp(dev, vi, rq, xdp_prog, buf, ctx,
2427                                                          len, xdp_xmit, stats);
2428                         rcu_read_unlock();
2429                         return head_skb;
2430                 }
2431                 rcu_read_unlock();
2432         }
2433
2434         head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
2435         curr_skb = head_skb;
2436
2437         if (unlikely(!curr_skb))
2438                 goto err_skb;
2439         while (--num_buf) {
2440                 buf = virtnet_rq_get_buf(rq, &len, &ctx);
2441                 if (unlikely(!buf)) {
2442                         pr_debug("%s: rx error: %d buffers out of %d missing\n",
2443                                  dev->name, num_buf,
2444                                  virtio16_to_cpu(vi->vdev,
2445                                                  hdr->num_buffers));
2446                         DEV_STATS_INC(dev, rx_length_errors);
2447                         goto err_buf;
2448                 }
2449
2450                 u64_stats_add(&stats->bytes, len);
2451                 page = virt_to_head_page(buf);
2452
2453                 truesize = mergeable_ctx_to_truesize(ctx);
2454                 headroom = mergeable_ctx_to_headroom(ctx);
2455                 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2456                 room = SKB_DATA_ALIGN(headroom + tailroom);
2457                 if (unlikely(len > truesize - room)) {
2458                         pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2459                                  dev->name, len, (unsigned long)(truesize - room));
2460                         DEV_STATS_INC(dev, rx_length_errors);
2461                         goto err_skb;
2462                 }
2463
2464                 curr_skb  = virtnet_skb_append_frag(head_skb, curr_skb, page,
2465                                                     buf, len, truesize);
2466                 if (!curr_skb)
2467                         goto err_skb;
2468         }
2469
2470         ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
2471         return head_skb;
2472
2473 err_skb:
2474         put_page(page);
2475         mergeable_buf_free(rq, num_buf, dev, stats);
2476
2477 err_buf:
2478         u64_stats_inc(&stats->drops);
2479         dev_kfree_skb(head_skb);
2480         return NULL;
2481 }
2482
2483 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
2484                                 struct sk_buff *skb)
2485 {
2486         enum pkt_hash_types rss_hash_type;
2487
2488         if (!hdr_hash || !skb)
2489                 return;
2490
2491         switch (__le16_to_cpu(hdr_hash->hash_report)) {
2492         case VIRTIO_NET_HASH_REPORT_TCPv4:
2493         case VIRTIO_NET_HASH_REPORT_UDPv4:
2494         case VIRTIO_NET_HASH_REPORT_TCPv6:
2495         case VIRTIO_NET_HASH_REPORT_UDPv6:
2496         case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
2497         case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
2498                 rss_hash_type = PKT_HASH_TYPE_L4;
2499                 break;
2500         case VIRTIO_NET_HASH_REPORT_IPv4:
2501         case VIRTIO_NET_HASH_REPORT_IPv6:
2502         case VIRTIO_NET_HASH_REPORT_IPv6_EX:
2503                 rss_hash_type = PKT_HASH_TYPE_L3;
2504                 break;
2505         case VIRTIO_NET_HASH_REPORT_NONE:
2506         default:
2507                 rss_hash_type = PKT_HASH_TYPE_NONE;
2508         }
2509         skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type);
2510 }
2511
2512 static void virtnet_receive_done(struct virtnet_info *vi, struct receive_queue *rq,
2513                                  struct sk_buff *skb, u8 flags)
2514 {
2515         struct virtio_net_common_hdr *hdr;
2516         struct net_device *dev = vi->dev;
2517
2518         hdr = skb_vnet_common_hdr(skb);
2519         if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report)
2520                 virtio_skb_set_hash(&hdr->hash_v1_hdr, skb);
2521
2522         if (flags & VIRTIO_NET_HDR_F_DATA_VALID)
2523                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2524
2525         if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
2526                                   virtio_is_little_endian(vi->vdev))) {
2527                 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
2528                                      dev->name, hdr->hdr.gso_type,
2529                                      hdr->hdr.gso_size);
2530                 goto frame_err;
2531         }
2532
2533         skb_record_rx_queue(skb, vq2rxq(rq->vq));
2534         skb->protocol = eth_type_trans(skb, dev);
2535         pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
2536                  ntohs(skb->protocol), skb->len, skb->pkt_type);
2537
2538         napi_gro_receive(&rq->napi, skb);
2539         return;
2540
2541 frame_err:
2542         DEV_STATS_INC(dev, rx_frame_errors);
2543         dev_kfree_skb(skb);
2544 }
2545
2546 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
2547                         void *buf, unsigned int len, void **ctx,
2548                         unsigned int *xdp_xmit,
2549                         struct virtnet_rq_stats *stats)
2550 {
2551         struct net_device *dev = vi->dev;
2552         struct sk_buff *skb;
2553         u8 flags;
2554
2555         if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
2556                 pr_debug("%s: short packet %i\n", dev->name, len);
2557                 DEV_STATS_INC(dev, rx_length_errors);
2558                 virtnet_rq_free_buf(vi, rq, buf);
2559                 return;
2560         }
2561
2562         /* 1. Save the flags early, as the XDP program might overwrite them.
2563          * These flags ensure packets marked as VIRTIO_NET_HDR_F_DATA_VALID
2564          * stay valid after XDP processing.
2565          * 2. XDP doesn't work with partially checksummed packets (refer to
2566          * virtnet_xdp_set()), so packets marked as
2567          * VIRTIO_NET_HDR_F_NEEDS_CSUM get dropped during XDP processing.
2568          */
2569         flags = ((struct virtio_net_common_hdr *)buf)->hdr.flags;
2570
2571         if (vi->mergeable_rx_bufs)
2572                 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
2573                                         stats);
2574         else if (vi->big_packets)
2575                 skb = receive_big(dev, vi, rq, buf, len, stats);
2576         else
2577                 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
2578
2579         if (unlikely(!skb))
2580                 return;
2581
2582         virtnet_receive_done(vi, rq, skb, flags);
2583 }
2584
2585 /* Unlike mergeable buffers, all buffers are allocated to the
2586  * same size, except for the headroom. For this reason we do
2587  * not need to use  mergeable_len_to_ctx here - it is enough
2588  * to store the headroom as the context ignoring the truesize.
2589  */
2590 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
2591                              gfp_t gfp)
2592 {
2593         char *buf;
2594         unsigned int xdp_headroom = virtnet_get_headroom(vi);
2595         void *ctx = (void *)(unsigned long)xdp_headroom;
2596         int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
2597         int err;
2598
2599         len = SKB_DATA_ALIGN(len) +
2600               SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
2601
2602         if (unlikely(!skb_page_frag_refill(len, &rq->alloc_frag, gfp)))
2603                 return -ENOMEM;
2604
2605         buf = virtnet_rq_alloc(rq, len, gfp);
2606         if (unlikely(!buf))
2607                 return -ENOMEM;
2608
2609         buf += VIRTNET_RX_PAD + xdp_headroom;
2610
2611         virtnet_rq_init_one_sg(rq, buf, vi->hdr_len + GOOD_PACKET_LEN);
2612
2613         err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx, gfp);
2614         if (err < 0) {
2615                 virtnet_rq_unmap(rq, buf, 0);
2616                 put_page(virt_to_head_page(buf));
2617         }
2618
2619         return err;
2620 }
2621
2622 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
2623                            gfp_t gfp)
2624 {
2625         struct page *first, *list = NULL;
2626         char *p;
2627         int i, err, offset;
2628
2629         sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2);
2630
2631         /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */
2632         for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) {
2633                 first = get_a_page(rq, gfp);
2634                 if (!first) {
2635                         if (list)
2636                                 give_pages(rq, list);
2637                         return -ENOMEM;
2638                 }
2639                 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
2640
2641                 /* chain new page in list head to match sg */
2642                 first->private = (unsigned long)list;
2643                 list = first;
2644         }
2645
2646         first = get_a_page(rq, gfp);
2647         if (!first) {
2648                 give_pages(rq, list);
2649                 return -ENOMEM;
2650         }
2651         p = page_address(first);
2652
2653         /* rq->sg[0], rq->sg[1] share the same page */
2654         /* a separated rq->sg[0] for header - required in case !any_header_sg */
2655         sg_set_buf(&rq->sg[0], p, vi->hdr_len);
2656
2657         /* rq->sg[1] for data packet, from offset */
2658         offset = sizeof(struct padded_vnet_hdr);
2659         sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
2660
2661         /* chain first in list head */
2662         first->private = (unsigned long)list;
2663         err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2,
2664                                   first, gfp);
2665         if (err < 0)
2666                 give_pages(rq, first);
2667
2668         return err;
2669 }
2670
2671 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
2672                                           struct ewma_pkt_len *avg_pkt_len,
2673                                           unsigned int room)
2674 {
2675         struct virtnet_info *vi = rq->vq->vdev->priv;
2676         const size_t hdr_len = vi->hdr_len;
2677         unsigned int len;
2678
2679         if (room)
2680                 return PAGE_SIZE - room;
2681
2682         len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
2683                                 rq->min_buf_len, PAGE_SIZE - hdr_len);
2684
2685         return ALIGN(len, L1_CACHE_BYTES);
2686 }
2687
2688 static int add_recvbuf_mergeable(struct virtnet_info *vi,
2689                                  struct receive_queue *rq, gfp_t gfp)
2690 {
2691         struct page_frag *alloc_frag = &rq->alloc_frag;
2692         unsigned int headroom = virtnet_get_headroom(vi);
2693         unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2694         unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
2695         unsigned int len, hole;
2696         void *ctx;
2697         char *buf;
2698         int err;
2699
2700         /* Extra tailroom is needed to satisfy XDP's assumption. This
2701          * means rx frags coalescing won't work, but consider we've
2702          * disabled GSO for XDP, it won't be a big issue.
2703          */
2704         len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
2705
2706         if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
2707                 return -ENOMEM;
2708
2709         if (!alloc_frag->offset && len + room + sizeof(struct virtnet_rq_dma) > alloc_frag->size)
2710                 len -= sizeof(struct virtnet_rq_dma);
2711
2712         buf = virtnet_rq_alloc(rq, len + room, gfp);
2713         if (unlikely(!buf))
2714                 return -ENOMEM;
2715
2716         buf += headroom; /* advance address leaving hole at front of pkt */
2717         hole = alloc_frag->size - alloc_frag->offset;
2718         if (hole < len + room) {
2719                 /* To avoid internal fragmentation, if there is very likely not
2720                  * enough space for another buffer, add the remaining space to
2721                  * the current buffer.
2722                  * XDP core assumes that frame_size of xdp_buff and the length
2723                  * of the frag are PAGE_SIZE, so we disable the hole mechanism.
2724                  */
2725                 if (!headroom)
2726                         len += hole;
2727                 alloc_frag->offset += hole;
2728         }
2729
2730         virtnet_rq_init_one_sg(rq, buf, len);
2731
2732         ctx = mergeable_len_to_ctx(len + room, headroom);
2733         err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx, gfp);
2734         if (err < 0) {
2735                 virtnet_rq_unmap(rq, buf, 0);
2736                 put_page(virt_to_head_page(buf));
2737         }
2738
2739         return err;
2740 }
2741
2742 /*
2743  * Returns false if we couldn't fill entirely (OOM).
2744  *
2745  * Normally run in the receive path, but can also be run from ndo_open
2746  * before we're receiving packets, or from refill_work which is
2747  * careful to disable receiving (using napi_disable).
2748  */
2749 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
2750                           gfp_t gfp)
2751 {
2752         int err;
2753
2754         if (rq->xsk_pool) {
2755                 err = virtnet_add_recvbuf_xsk(vi, rq, rq->xsk_pool, gfp);
2756                 goto kick;
2757         }
2758
2759         do {
2760                 if (vi->mergeable_rx_bufs)
2761                         err = add_recvbuf_mergeable(vi, rq, gfp);
2762                 else if (vi->big_packets)
2763                         err = add_recvbuf_big(vi, rq, gfp);
2764                 else
2765                         err = add_recvbuf_small(vi, rq, gfp);
2766
2767                 if (err)
2768                         break;
2769         } while (rq->vq->num_free);
2770
2771 kick:
2772         if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
2773                 unsigned long flags;
2774
2775                 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
2776                 u64_stats_inc(&rq->stats.kicks);
2777                 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
2778         }
2779
2780         return err != -ENOMEM;
2781 }
2782
2783 static void skb_recv_done(struct virtqueue *rvq)
2784 {
2785         struct virtnet_info *vi = rvq->vdev->priv;
2786         struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
2787
2788         rq->calls++;
2789         virtqueue_napi_schedule(&rq->napi, rvq);
2790 }
2791
2792 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
2793 {
2794         napi_enable(napi);
2795
2796         /* If all buffers were filled by other side before we napi_enabled, we
2797          * won't get another interrupt, so process any outstanding packets now.
2798          * Call local_bh_enable after to trigger softIRQ processing.
2799          */
2800         local_bh_disable();
2801         virtqueue_napi_schedule(napi, vq);
2802         local_bh_enable();
2803 }
2804
2805 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
2806                                    struct virtqueue *vq,
2807                                    struct napi_struct *napi)
2808 {
2809         if (!napi->weight)
2810                 return;
2811
2812         /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
2813          * enable the feature if this is likely affine with the transmit path.
2814          */
2815         if (!vi->affinity_hint_set) {
2816                 napi->weight = 0;
2817                 return;
2818         }
2819
2820         return virtnet_napi_enable(vq, napi);
2821 }
2822
2823 static void virtnet_napi_tx_disable(struct napi_struct *napi)
2824 {
2825         if (napi->weight)
2826                 napi_disable(napi);
2827 }
2828
2829 static void refill_work(struct work_struct *work)
2830 {
2831         struct virtnet_info *vi =
2832                 container_of(work, struct virtnet_info, refill.work);
2833         bool still_empty;
2834         int i;
2835
2836         for (i = 0; i < vi->curr_queue_pairs; i++) {
2837                 struct receive_queue *rq = &vi->rq[i];
2838
2839                 napi_disable(&rq->napi);
2840                 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
2841                 virtnet_napi_enable(rq->vq, &rq->napi);
2842
2843                 /* In theory, this can happen: if we don't get any buffers in
2844                  * we will *never* try to fill again.
2845                  */
2846                 if (still_empty)
2847                         schedule_delayed_work(&vi->refill, HZ/2);
2848         }
2849 }
2850
2851 static int virtnet_receive_xsk_bufs(struct virtnet_info *vi,
2852                                     struct receive_queue *rq,
2853                                     int budget,
2854                                     unsigned int *xdp_xmit,
2855                                     struct virtnet_rq_stats *stats)
2856 {
2857         unsigned int len;
2858         int packets = 0;
2859         void *buf;
2860
2861         while (packets < budget) {
2862                 buf = virtqueue_get_buf(rq->vq, &len);
2863                 if (!buf)
2864                         break;
2865
2866                 virtnet_receive_xsk_buf(vi, rq, buf, len, xdp_xmit, stats);
2867                 packets++;
2868         }
2869
2870         return packets;
2871 }
2872
2873 static int virtnet_receive_packets(struct virtnet_info *vi,
2874                                    struct receive_queue *rq,
2875                                    int budget,
2876                                    unsigned int *xdp_xmit,
2877                                    struct virtnet_rq_stats *stats)
2878 {
2879         unsigned int len;
2880         int packets = 0;
2881         void *buf;
2882
2883         if (!vi->big_packets || vi->mergeable_rx_bufs) {
2884                 void *ctx;
2885                 while (packets < budget &&
2886                        (buf = virtnet_rq_get_buf(rq, &len, &ctx))) {
2887                         receive_buf(vi, rq, buf, len, ctx, xdp_xmit, stats);
2888                         packets++;
2889                 }
2890         } else {
2891                 while (packets < budget &&
2892                        (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
2893                         receive_buf(vi, rq, buf, len, NULL, xdp_xmit, stats);
2894                         packets++;
2895                 }
2896         }
2897
2898         return packets;
2899 }
2900
2901 static int virtnet_receive(struct receive_queue *rq, int budget,
2902                            unsigned int *xdp_xmit)
2903 {
2904         struct virtnet_info *vi = rq->vq->vdev->priv;
2905         struct virtnet_rq_stats stats = {};
2906         int i, packets;
2907
2908         if (rq->xsk_pool)
2909                 packets = virtnet_receive_xsk_bufs(vi, rq, budget, xdp_xmit, &stats);
2910         else
2911                 packets = virtnet_receive_packets(vi, rq, budget, xdp_xmit, &stats);
2912
2913         if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
2914                 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
2915                         spin_lock(&vi->refill_lock);
2916                         if (vi->refill_enabled)
2917                                 schedule_delayed_work(&vi->refill, 0);
2918                         spin_unlock(&vi->refill_lock);
2919                 }
2920         }
2921
2922         u64_stats_set(&stats.packets, packets);
2923         u64_stats_update_begin(&rq->stats.syncp);
2924         for (i = 0; i < ARRAY_SIZE(virtnet_rq_stats_desc); i++) {
2925                 size_t offset = virtnet_rq_stats_desc[i].offset;
2926                 u64_stats_t *item, *src;
2927
2928                 item = (u64_stats_t *)((u8 *)&rq->stats + offset);
2929                 src = (u64_stats_t *)((u8 *)&stats + offset);
2930                 u64_stats_add(item, u64_stats_read(src));
2931         }
2932
2933         u64_stats_add(&rq->stats.packets, u64_stats_read(&stats.packets));
2934         u64_stats_add(&rq->stats.bytes, u64_stats_read(&stats.bytes));
2935
2936         u64_stats_update_end(&rq->stats.syncp);
2937
2938         return packets;
2939 }
2940
2941 static void virtnet_poll_cleantx(struct receive_queue *rq, int budget)
2942 {
2943         struct virtnet_info *vi = rq->vq->vdev->priv;
2944         unsigned int index = vq2rxq(rq->vq);
2945         struct send_queue *sq = &vi->sq[index];
2946         struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
2947
2948         if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
2949                 return;
2950
2951         if (__netif_tx_trylock(txq)) {
2952                 if (sq->reset) {
2953                         __netif_tx_unlock(txq);
2954                         return;
2955                 }
2956
2957                 do {
2958                         virtqueue_disable_cb(sq->vq);
2959                         free_old_xmit(sq, txq, !!budget);
2960                 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
2961
2962                 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
2963                         if (netif_tx_queue_stopped(txq)) {
2964                                 u64_stats_update_begin(&sq->stats.syncp);
2965                                 u64_stats_inc(&sq->stats.wake);
2966                                 u64_stats_update_end(&sq->stats.syncp);
2967                         }
2968                         netif_tx_wake_queue(txq);
2969                 }
2970
2971                 __netif_tx_unlock(txq);
2972         }
2973 }
2974
2975 static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue *rq)
2976 {
2977         struct dim_sample cur_sample = {};
2978
2979         if (!rq->packets_in_napi)
2980                 return;
2981
2982         /* Don't need protection when fetching stats, since fetcher and
2983          * updater of the stats are in same context
2984          */
2985         dim_update_sample(rq->calls,
2986                           u64_stats_read(&rq->stats.packets),
2987                           u64_stats_read(&rq->stats.bytes),
2988                           &cur_sample);
2989
2990         net_dim(&rq->dim, &cur_sample);
2991         rq->packets_in_napi = 0;
2992 }
2993
2994 static int virtnet_poll(struct napi_struct *napi, int budget)
2995 {
2996         struct receive_queue *rq =
2997                 container_of(napi, struct receive_queue, napi);
2998         struct virtnet_info *vi = rq->vq->vdev->priv;
2999         struct send_queue *sq;
3000         unsigned int received;
3001         unsigned int xdp_xmit = 0;
3002         bool napi_complete;
3003
3004         virtnet_poll_cleantx(rq, budget);
3005
3006         received = virtnet_receive(rq, budget, &xdp_xmit);
3007         rq->packets_in_napi += received;
3008
3009         if (xdp_xmit & VIRTIO_XDP_REDIR)
3010                 xdp_do_flush();
3011
3012         /* Out of packets? */
3013         if (received < budget) {
3014                 napi_complete = virtqueue_napi_complete(napi, rq->vq, received);
3015                 /* Intentionally not taking dim_lock here. This may result in a
3016                  * spurious net_dim call. But if that happens virtnet_rx_dim_work
3017                  * will not act on the scheduled work.
3018                  */
3019                 if (napi_complete && rq->dim_enabled)
3020                         virtnet_rx_dim_update(vi, rq);
3021         }
3022
3023         if (xdp_xmit & VIRTIO_XDP_TX) {
3024                 sq = virtnet_xdp_get_sq(vi);
3025                 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
3026                         u64_stats_update_begin(&sq->stats.syncp);
3027                         u64_stats_inc(&sq->stats.kicks);
3028                         u64_stats_update_end(&sq->stats.syncp);
3029                 }
3030                 virtnet_xdp_put_sq(vi, sq);
3031         }
3032
3033         return received;
3034 }
3035
3036 static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
3037 {
3038         virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
3039         napi_disable(&vi->rq[qp_index].napi);
3040         xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
3041 }
3042
3043 static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
3044 {
3045         struct net_device *dev = vi->dev;
3046         int err;
3047
3048         err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
3049                                vi->rq[qp_index].napi.napi_id);
3050         if (err < 0)
3051                 return err;
3052
3053         err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
3054                                          MEM_TYPE_PAGE_SHARED, NULL);
3055         if (err < 0)
3056                 goto err_xdp_reg_mem_model;
3057
3058         virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
3059         virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
3060
3061         return 0;
3062
3063 err_xdp_reg_mem_model:
3064         xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
3065         return err;
3066 }
3067
3068 static void virtnet_cancel_dim(struct virtnet_info *vi, struct dim *dim)
3069 {
3070         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3071                 return;
3072         net_dim_work_cancel(dim);
3073 }
3074
3075 static void virtnet_update_settings(struct virtnet_info *vi)
3076 {
3077         u32 speed;
3078         u8 duplex;
3079
3080         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
3081                 return;
3082
3083         virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
3084
3085         if (ethtool_validate_speed(speed))
3086                 vi->speed = speed;
3087
3088         virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
3089
3090         if (ethtool_validate_duplex(duplex))
3091                 vi->duplex = duplex;
3092 }
3093
3094 static int virtnet_open(struct net_device *dev)
3095 {
3096         struct virtnet_info *vi = netdev_priv(dev);
3097         int i, err;
3098
3099         enable_delayed_refill(vi);
3100
3101         for (i = 0; i < vi->max_queue_pairs; i++) {
3102                 if (i < vi->curr_queue_pairs)
3103                         /* Make sure we have some buffers: if oom use wq. */
3104                         if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
3105                                 schedule_delayed_work(&vi->refill, 0);
3106
3107                 err = virtnet_enable_queue_pair(vi, i);
3108                 if (err < 0)
3109                         goto err_enable_qp;
3110         }
3111
3112         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3113                 if (vi->status & VIRTIO_NET_S_LINK_UP)
3114                         netif_carrier_on(vi->dev);
3115                 virtio_config_driver_enable(vi->vdev);
3116         } else {
3117                 vi->status = VIRTIO_NET_S_LINK_UP;
3118                 netif_carrier_on(dev);
3119         }
3120
3121         return 0;
3122
3123 err_enable_qp:
3124         disable_delayed_refill(vi);
3125         cancel_delayed_work_sync(&vi->refill);
3126
3127         for (i--; i >= 0; i--) {
3128                 virtnet_disable_queue_pair(vi, i);
3129                 virtnet_cancel_dim(vi, &vi->rq[i].dim);
3130         }
3131
3132         return err;
3133 }
3134
3135 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
3136 {
3137         struct send_queue *sq = container_of(napi, struct send_queue, napi);
3138         struct virtnet_info *vi = sq->vq->vdev->priv;
3139         unsigned int index = vq2txq(sq->vq);
3140         struct netdev_queue *txq;
3141         int opaque, xsk_done = 0;
3142         bool done;
3143
3144         if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
3145                 /* We don't need to enable cb for XDP */
3146                 napi_complete_done(napi, 0);
3147                 return 0;
3148         }
3149
3150         txq = netdev_get_tx_queue(vi->dev, index);
3151         __netif_tx_lock(txq, raw_smp_processor_id());
3152         virtqueue_disable_cb(sq->vq);
3153
3154         if (sq->xsk_pool)
3155                 xsk_done = virtnet_xsk_xmit(sq, sq->xsk_pool, budget);
3156         else
3157                 free_old_xmit(sq, txq, !!budget);
3158
3159         if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
3160                 if (netif_tx_queue_stopped(txq)) {
3161                         u64_stats_update_begin(&sq->stats.syncp);
3162                         u64_stats_inc(&sq->stats.wake);
3163                         u64_stats_update_end(&sq->stats.syncp);
3164                 }
3165                 netif_tx_wake_queue(txq);
3166         }
3167
3168         if (xsk_done >= budget) {
3169                 __netif_tx_unlock(txq);
3170                 return budget;
3171         }
3172
3173         opaque = virtqueue_enable_cb_prepare(sq->vq);
3174
3175         done = napi_complete_done(napi, 0);
3176
3177         if (!done)
3178                 virtqueue_disable_cb(sq->vq);
3179
3180         __netif_tx_unlock(txq);
3181
3182         if (done) {
3183                 if (unlikely(virtqueue_poll(sq->vq, opaque))) {
3184                         if (napi_schedule_prep(napi)) {
3185                                 __netif_tx_lock(txq, raw_smp_processor_id());
3186                                 virtqueue_disable_cb(sq->vq);
3187                                 __netif_tx_unlock(txq);
3188                                 __napi_schedule(napi);
3189                         }
3190                 }
3191         }
3192
3193         return 0;
3194 }
3195
3196 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb, bool orphan)
3197 {
3198         struct virtio_net_hdr_mrg_rxbuf *hdr;
3199         const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
3200         struct virtnet_info *vi = sq->vq->vdev->priv;
3201         int num_sg;
3202         unsigned hdr_len = vi->hdr_len;
3203         bool can_push;
3204
3205         pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
3206
3207         can_push = vi->any_header_sg &&
3208                 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
3209                 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
3210         /* Even if we can, don't push here yet as this would skew
3211          * csum_start offset below. */
3212         if (can_push)
3213                 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
3214         else
3215                 hdr = &skb_vnet_common_hdr(skb)->mrg_hdr;
3216
3217         if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
3218                                     virtio_is_little_endian(vi->vdev), false,
3219                                     0))
3220                 return -EPROTO;
3221
3222         if (vi->mergeable_rx_bufs)
3223                 hdr->num_buffers = 0;
3224
3225         sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
3226         if (can_push) {
3227                 __skb_push(skb, hdr_len);
3228                 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
3229                 if (unlikely(num_sg < 0))
3230                         return num_sg;
3231                 /* Pull header back to avoid skew in tx bytes calculations. */
3232                 __skb_pull(skb, hdr_len);
3233         } else {
3234                 sg_set_buf(sq->sg, hdr, hdr_len);
3235                 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
3236                 if (unlikely(num_sg < 0))
3237                         return num_sg;
3238                 num_sg++;
3239         }
3240
3241         return virtnet_add_outbuf(sq, num_sg, skb,
3242                                   orphan ? VIRTNET_XMIT_TYPE_SKB_ORPHAN : VIRTNET_XMIT_TYPE_SKB);
3243 }
3244
3245 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
3246 {
3247         struct virtnet_info *vi = netdev_priv(dev);
3248         int qnum = skb_get_queue_mapping(skb);
3249         struct send_queue *sq = &vi->sq[qnum];
3250         int err;
3251         struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
3252         bool xmit_more = netdev_xmit_more();
3253         bool use_napi = sq->napi.weight;
3254         bool kick;
3255
3256         /* Free up any pending old buffers before queueing new ones. */
3257         do {
3258                 if (use_napi)
3259                         virtqueue_disable_cb(sq->vq);
3260
3261                 free_old_xmit(sq, txq, false);
3262
3263         } while (use_napi && !xmit_more &&
3264                unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
3265
3266         /* timestamp packet in software */
3267         skb_tx_timestamp(skb);
3268
3269         /* Try to transmit */
3270         err = xmit_skb(sq, skb, !use_napi);
3271
3272         /* This should not happen! */
3273         if (unlikely(err)) {
3274                 DEV_STATS_INC(dev, tx_fifo_errors);
3275                 if (net_ratelimit())
3276                         dev_warn(&dev->dev,
3277                                  "Unexpected TXQ (%d) queue failure: %d\n",
3278                                  qnum, err);
3279                 DEV_STATS_INC(dev, tx_dropped);
3280                 dev_kfree_skb_any(skb);
3281                 return NETDEV_TX_OK;
3282         }
3283
3284         /* Don't wait up for transmitted skbs to be freed. */
3285         if (!use_napi) {
3286                 skb_orphan(skb);
3287                 nf_reset_ct(skb);
3288         }
3289
3290         check_sq_full_and_disable(vi, dev, sq);
3291
3292         kick = use_napi ? __netdev_tx_sent_queue(txq, skb->len, xmit_more) :
3293                           !xmit_more || netif_xmit_stopped(txq);
3294         if (kick) {
3295                 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
3296                         u64_stats_update_begin(&sq->stats.syncp);
3297                         u64_stats_inc(&sq->stats.kicks);
3298                         u64_stats_update_end(&sq->stats.syncp);
3299                 }
3300         }
3301
3302         return NETDEV_TX_OK;
3303 }
3304
3305 static void virtnet_rx_pause(struct virtnet_info *vi, struct receive_queue *rq)
3306 {
3307         bool running = netif_running(vi->dev);
3308
3309         if (running) {
3310                 napi_disable(&rq->napi);
3311                 virtnet_cancel_dim(vi, &rq->dim);
3312         }
3313 }
3314
3315 static void virtnet_rx_resume(struct virtnet_info *vi, struct receive_queue *rq)
3316 {
3317         bool running = netif_running(vi->dev);
3318
3319         if (!try_fill_recv(vi, rq, GFP_KERNEL))
3320                 schedule_delayed_work(&vi->refill, 0);
3321
3322         if (running)
3323                 virtnet_napi_enable(rq->vq, &rq->napi);
3324 }
3325
3326 static int virtnet_rx_resize(struct virtnet_info *vi,
3327                              struct receive_queue *rq, u32 ring_num)
3328 {
3329         int err, qindex;
3330
3331         qindex = rq - vi->rq;
3332
3333         virtnet_rx_pause(vi, rq);
3334
3335         err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_unmap_free_buf, NULL);
3336         if (err)
3337                 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
3338
3339         virtnet_rx_resume(vi, rq);
3340         return err;
3341 }
3342
3343 static void virtnet_tx_pause(struct virtnet_info *vi, struct send_queue *sq)
3344 {
3345         bool running = netif_running(vi->dev);
3346         struct netdev_queue *txq;
3347         int qindex;
3348
3349         qindex = sq - vi->sq;
3350
3351         if (running)
3352                 virtnet_napi_tx_disable(&sq->napi);
3353
3354         txq = netdev_get_tx_queue(vi->dev, qindex);
3355
3356         /* 1. wait all ximt complete
3357          * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue()
3358          */
3359         __netif_tx_lock_bh(txq);
3360
3361         /* Prevent rx poll from accessing sq. */
3362         sq->reset = true;
3363
3364         /* Prevent the upper layer from trying to send packets. */
3365         netif_stop_subqueue(vi->dev, qindex);
3366
3367         __netif_tx_unlock_bh(txq);
3368 }
3369
3370 static void virtnet_tx_resume(struct virtnet_info *vi, struct send_queue *sq)
3371 {
3372         bool running = netif_running(vi->dev);
3373         struct netdev_queue *txq;
3374         int qindex;
3375
3376         qindex = sq - vi->sq;
3377
3378         txq = netdev_get_tx_queue(vi->dev, qindex);
3379
3380         __netif_tx_lock_bh(txq);
3381         sq->reset = false;
3382         netif_tx_wake_queue(txq);
3383         __netif_tx_unlock_bh(txq);
3384
3385         if (running)
3386                 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi);
3387 }
3388
3389 static int virtnet_tx_resize(struct virtnet_info *vi, struct send_queue *sq,
3390                              u32 ring_num)
3391 {
3392         int qindex, err;
3393
3394         qindex = sq - vi->sq;
3395
3396         virtnet_tx_pause(vi, sq);
3397
3398         err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf,
3399                                virtnet_sq_free_unused_buf_done);
3400         if (err)
3401                 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
3402
3403         virtnet_tx_resume(vi, sq);
3404
3405         return err;
3406 }
3407
3408 /*
3409  * Send command via the control virtqueue and check status.  Commands
3410  * supported by the hypervisor, as indicated by feature bits, should
3411  * never fail unless improperly formatted.
3412  */
3413 static bool virtnet_send_command_reply(struct virtnet_info *vi, u8 class, u8 cmd,
3414                                        struct scatterlist *out,
3415                                        struct scatterlist *in)
3416 {
3417         struct scatterlist *sgs[5], hdr, stat;
3418         u32 out_num = 0, tmp, in_num = 0;
3419         bool ok;
3420         int ret;
3421
3422         /* Caller should know better */
3423         BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
3424
3425         mutex_lock(&vi->cvq_lock);
3426         vi->ctrl->status = ~0;
3427         vi->ctrl->hdr.class = class;
3428         vi->ctrl->hdr.cmd = cmd;
3429         /* Add header */
3430         sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
3431         sgs[out_num++] = &hdr;
3432
3433         if (out)
3434                 sgs[out_num++] = out;
3435
3436         /* Add return status. */
3437         sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
3438         sgs[out_num + in_num++] = &stat;
3439
3440         if (in)
3441                 sgs[out_num + in_num++] = in;
3442
3443         BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
3444         ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC);
3445         if (ret < 0) {
3446                 dev_warn(&vi->vdev->dev,
3447                          "Failed to add sgs for command vq: %d\n.", ret);
3448                 mutex_unlock(&vi->cvq_lock);
3449                 return false;
3450         }
3451
3452         if (unlikely(!virtqueue_kick(vi->cvq)))
3453                 goto unlock;
3454
3455         /* Spin for a response, the kick causes an ioport write, trapping
3456          * into the hypervisor, so the request should be handled immediately.
3457          */
3458         while (!virtqueue_get_buf(vi->cvq, &tmp) &&
3459                !virtqueue_is_broken(vi->cvq)) {
3460                 cond_resched();
3461                 cpu_relax();
3462         }
3463
3464 unlock:
3465         ok = vi->ctrl->status == VIRTIO_NET_OK;
3466         mutex_unlock(&vi->cvq_lock);
3467         return ok;
3468 }
3469
3470 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
3471                                  struct scatterlist *out)
3472 {
3473         return virtnet_send_command_reply(vi, class, cmd, out, NULL);
3474 }
3475
3476 static int virtnet_set_mac_address(struct net_device *dev, void *p)
3477 {
3478         struct virtnet_info *vi = netdev_priv(dev);
3479         struct virtio_device *vdev = vi->vdev;
3480         int ret;
3481         struct sockaddr *addr;
3482         struct scatterlist sg;
3483
3484         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
3485                 return -EOPNOTSUPP;
3486
3487         addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
3488         if (!addr)
3489                 return -ENOMEM;
3490
3491         ret = eth_prepare_mac_addr_change(dev, addr);
3492         if (ret)
3493                 goto out;
3494
3495         if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
3496                 sg_init_one(&sg, addr->sa_data, dev->addr_len);
3497                 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
3498                                           VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
3499                         dev_warn(&vdev->dev,
3500                                  "Failed to set mac address by vq command.\n");
3501                         ret = -EINVAL;
3502                         goto out;
3503                 }
3504         } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
3505                    !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
3506                 unsigned int i;
3507
3508                 /* Naturally, this has an atomicity problem. */
3509                 for (i = 0; i < dev->addr_len; i++)
3510                         virtio_cwrite8(vdev,
3511                                        offsetof(struct virtio_net_config, mac) +
3512                                        i, addr->sa_data[i]);
3513         }
3514
3515         eth_commit_mac_addr_change(dev, p);
3516         ret = 0;
3517
3518 out:
3519         kfree(addr);
3520         return ret;
3521 }
3522
3523 static void virtnet_stats(struct net_device *dev,
3524                           struct rtnl_link_stats64 *tot)
3525 {
3526         struct virtnet_info *vi = netdev_priv(dev);
3527         unsigned int start;
3528         int i;
3529
3530         for (i = 0; i < vi->max_queue_pairs; i++) {
3531                 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops;
3532                 struct receive_queue *rq = &vi->rq[i];
3533                 struct send_queue *sq = &vi->sq[i];
3534
3535                 do {
3536                         start = u64_stats_fetch_begin(&sq->stats.syncp);
3537                         tpackets = u64_stats_read(&sq->stats.packets);
3538                         tbytes   = u64_stats_read(&sq->stats.bytes);
3539                         terrors  = u64_stats_read(&sq->stats.tx_timeouts);
3540                 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
3541
3542                 do {
3543                         start = u64_stats_fetch_begin(&rq->stats.syncp);
3544                         rpackets = u64_stats_read(&rq->stats.packets);
3545                         rbytes   = u64_stats_read(&rq->stats.bytes);
3546                         rdrops   = u64_stats_read(&rq->stats.drops);
3547                 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
3548
3549                 tot->rx_packets += rpackets;
3550                 tot->tx_packets += tpackets;
3551                 tot->rx_bytes   += rbytes;
3552                 tot->tx_bytes   += tbytes;
3553                 tot->rx_dropped += rdrops;
3554                 tot->tx_errors  += terrors;
3555         }
3556
3557         tot->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3558         tot->tx_fifo_errors = DEV_STATS_READ(dev, tx_fifo_errors);
3559         tot->rx_length_errors = DEV_STATS_READ(dev, rx_length_errors);
3560         tot->rx_frame_errors = DEV_STATS_READ(dev, rx_frame_errors);
3561 }
3562
3563 static void virtnet_ack_link_announce(struct virtnet_info *vi)
3564 {
3565         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
3566                                   VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
3567                 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
3568 }
3569
3570 static bool virtnet_commit_rss_command(struct virtnet_info *vi);
3571
3572 static void virtnet_rss_update_by_qpairs(struct virtnet_info *vi, u16 queue_pairs)
3573 {
3574         u32 indir_val = 0;
3575         int i = 0;
3576
3577         for (; i < vi->rss_indir_table_size; ++i) {
3578                 indir_val = ethtool_rxfh_indir_default(i, queue_pairs);
3579                 vi->rss.indirection_table[i] = indir_val;
3580         }
3581         vi->rss.max_tx_vq = queue_pairs;
3582 }
3583
3584 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
3585 {
3586         struct virtio_net_ctrl_mq *mq __free(kfree) = NULL;
3587         struct virtio_net_ctrl_rss old_rss;
3588         struct net_device *dev = vi->dev;
3589         struct scatterlist sg;
3590
3591         if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
3592                 return 0;
3593
3594         /* Firstly check if we need update rss. Do updating if both (1) rss enabled and
3595          * (2) no user configuration.
3596          *
3597          * During rss command processing, device updates queue_pairs using rss.max_tx_vq. That is,
3598          * the device updates queue_pairs together with rss, so we can skip the sperate queue_pairs
3599          * update (VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET below) and return directly.
3600          */
3601         if (vi->has_rss && !netif_is_rxfh_configured(dev)) {
3602                 memcpy(&old_rss, &vi->rss, sizeof(old_rss));
3603                 if (rss_indirection_table_alloc(&vi->rss, vi->rss_indir_table_size)) {
3604                         vi->rss.indirection_table = old_rss.indirection_table;
3605                         return -ENOMEM;
3606                 }
3607
3608                 virtnet_rss_update_by_qpairs(vi, queue_pairs);
3609
3610                 if (!virtnet_commit_rss_command(vi)) {
3611                         /* restore ctrl_rss if commit_rss_command failed */
3612                         rss_indirection_table_free(&vi->rss);
3613                         memcpy(&vi->rss, &old_rss, sizeof(old_rss));
3614
3615                         dev_warn(&dev->dev, "Fail to set num of queue pairs to %d, because committing RSS failed\n",
3616                                  queue_pairs);
3617                         return -EINVAL;
3618                 }
3619                 rss_indirection_table_free(&old_rss);
3620                 goto succ;
3621         }
3622
3623         mq = kzalloc(sizeof(*mq), GFP_KERNEL);
3624         if (!mq)
3625                 return -ENOMEM;
3626
3627         mq->virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
3628         sg_init_one(&sg, mq, sizeof(*mq));
3629
3630         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
3631                                   VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
3632                 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
3633                          queue_pairs);
3634                 return -EINVAL;
3635         }
3636 succ:
3637         vi->curr_queue_pairs = queue_pairs;
3638         /* virtnet_open() will refill when device is going to up. */
3639         if (dev->flags & IFF_UP)
3640                 schedule_delayed_work(&vi->refill, 0);
3641
3642         return 0;
3643 }
3644
3645 static int virtnet_close(struct net_device *dev)
3646 {
3647         struct virtnet_info *vi = netdev_priv(dev);
3648         int i;
3649
3650         /* Make sure NAPI doesn't schedule refill work */
3651         disable_delayed_refill(vi);
3652         /* Make sure refill_work doesn't re-enable napi! */
3653         cancel_delayed_work_sync(&vi->refill);
3654         /* Prevent the config change callback from changing carrier
3655          * after close
3656          */
3657         virtio_config_driver_disable(vi->vdev);
3658         /* Stop getting status/speed updates: we don't care until next
3659          * open
3660          */
3661         cancel_work_sync(&vi->config_work);
3662
3663         for (i = 0; i < vi->max_queue_pairs; i++) {
3664                 virtnet_disable_queue_pair(vi, i);
3665                 virtnet_cancel_dim(vi, &vi->rq[i].dim);
3666         }
3667
3668         netif_carrier_off(dev);
3669
3670         return 0;
3671 }
3672
3673 static void virtnet_rx_mode_work(struct work_struct *work)
3674 {
3675         struct virtnet_info *vi =
3676                 container_of(work, struct virtnet_info, rx_mode_work);
3677         u8 *promisc_allmulti  __free(kfree) = NULL;
3678         struct net_device *dev = vi->dev;
3679         struct scatterlist sg[2];
3680         struct virtio_net_ctrl_mac *mac_data;
3681         struct netdev_hw_addr *ha;
3682         int uc_count;
3683         int mc_count;
3684         void *buf;
3685         int i;
3686
3687         /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
3688         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
3689                 return;
3690
3691         promisc_allmulti = kzalloc(sizeof(*promisc_allmulti), GFP_KERNEL);
3692         if (!promisc_allmulti) {
3693                 dev_warn(&dev->dev, "Failed to set RX mode, no memory.\n");
3694                 return;
3695         }
3696
3697         rtnl_lock();
3698
3699         *promisc_allmulti = !!(dev->flags & IFF_PROMISC);
3700         sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
3701
3702         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
3703                                   VIRTIO_NET_CTRL_RX_PROMISC, sg))
3704                 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
3705                          *promisc_allmulti ? "en" : "dis");
3706
3707         *promisc_allmulti = !!(dev->flags & IFF_ALLMULTI);
3708         sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
3709
3710         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
3711                                   VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
3712                 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
3713                          *promisc_allmulti ? "en" : "dis");
3714
3715         netif_addr_lock_bh(dev);
3716
3717         uc_count = netdev_uc_count(dev);
3718         mc_count = netdev_mc_count(dev);
3719         /* MAC filter - use one buffer for both lists */
3720         buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
3721                       (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
3722         mac_data = buf;
3723         if (!buf) {
3724                 netif_addr_unlock_bh(dev);
3725                 rtnl_unlock();
3726                 return;
3727         }
3728
3729         sg_init_table(sg, 2);
3730
3731         /* Store the unicast list and count in the front of the buffer */
3732         mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
3733         i = 0;
3734         netdev_for_each_uc_addr(ha, dev)
3735                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
3736
3737         sg_set_buf(&sg[0], mac_data,
3738                    sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
3739
3740         /* multicast list and count fill the end */
3741         mac_data = (void *)&mac_data->macs[uc_count][0];
3742
3743         mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
3744         i = 0;
3745         netdev_for_each_mc_addr(ha, dev)
3746                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
3747
3748         netif_addr_unlock_bh(dev);
3749
3750         sg_set_buf(&sg[1], mac_data,
3751                    sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
3752
3753         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
3754                                   VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
3755                 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
3756
3757         rtnl_unlock();
3758
3759         kfree(buf);
3760 }
3761
3762 static void virtnet_set_rx_mode(struct net_device *dev)
3763 {
3764         struct virtnet_info *vi = netdev_priv(dev);
3765
3766         if (vi->rx_mode_work_enabled)
3767                 schedule_work(&vi->rx_mode_work);
3768 }
3769
3770 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
3771                                    __be16 proto, u16 vid)
3772 {
3773         struct virtnet_info *vi = netdev_priv(dev);
3774         __virtio16 *_vid __free(kfree) = NULL;
3775         struct scatterlist sg;
3776
3777         _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
3778         if (!_vid)
3779                 return -ENOMEM;
3780
3781         *_vid = cpu_to_virtio16(vi->vdev, vid);
3782         sg_init_one(&sg, _vid, sizeof(*_vid));
3783
3784         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
3785                                   VIRTIO_NET_CTRL_VLAN_ADD, &sg))
3786                 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
3787         return 0;
3788 }
3789
3790 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
3791                                     __be16 proto, u16 vid)
3792 {
3793         struct virtnet_info *vi = netdev_priv(dev);
3794         __virtio16 *_vid __free(kfree) = NULL;
3795         struct scatterlist sg;
3796
3797         _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
3798         if (!_vid)
3799                 return -ENOMEM;
3800
3801         *_vid = cpu_to_virtio16(vi->vdev, vid);
3802         sg_init_one(&sg, _vid, sizeof(*_vid));
3803
3804         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
3805                                   VIRTIO_NET_CTRL_VLAN_DEL, &sg))
3806                 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
3807         return 0;
3808 }
3809
3810 static void virtnet_clean_affinity(struct virtnet_info *vi)
3811 {
3812         int i;
3813
3814         if (vi->affinity_hint_set) {
3815                 for (i = 0; i < vi->max_queue_pairs; i++) {
3816                         virtqueue_set_affinity(vi->rq[i].vq, NULL);
3817                         virtqueue_set_affinity(vi->sq[i].vq, NULL);
3818                 }
3819
3820                 vi->affinity_hint_set = false;
3821         }
3822 }
3823
3824 static void virtnet_set_affinity(struct virtnet_info *vi)
3825 {
3826         cpumask_var_t mask;
3827         int stragglers;
3828         int group_size;
3829         int i, j, cpu;
3830         int num_cpu;
3831         int stride;
3832
3833         if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
3834                 virtnet_clean_affinity(vi);
3835                 return;
3836         }
3837
3838         num_cpu = num_online_cpus();
3839         stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
3840         stragglers = num_cpu >= vi->curr_queue_pairs ?
3841                         num_cpu % vi->curr_queue_pairs :
3842                         0;
3843         cpu = cpumask_first(cpu_online_mask);
3844
3845         for (i = 0; i < vi->curr_queue_pairs; i++) {
3846                 group_size = stride + (i < stragglers ? 1 : 0);
3847
3848                 for (j = 0; j < group_size; j++) {
3849                         cpumask_set_cpu(cpu, mask);
3850                         cpu = cpumask_next_wrap(cpu, cpu_online_mask,
3851                                                 nr_cpu_ids, false);
3852                 }
3853                 virtqueue_set_affinity(vi->rq[i].vq, mask);
3854                 virtqueue_set_affinity(vi->sq[i].vq, mask);
3855                 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS);
3856                 cpumask_clear(mask);
3857         }
3858
3859         vi->affinity_hint_set = true;
3860         free_cpumask_var(mask);
3861 }
3862
3863 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
3864 {
3865         struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3866                                                    node);
3867         virtnet_set_affinity(vi);
3868         return 0;
3869 }
3870
3871 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
3872 {
3873         struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3874                                                    node_dead);
3875         virtnet_set_affinity(vi);
3876         return 0;
3877 }
3878
3879 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
3880 {
3881         struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3882                                                    node);
3883
3884         virtnet_clean_affinity(vi);
3885         return 0;
3886 }
3887
3888 static enum cpuhp_state virtionet_online;
3889
3890 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
3891 {
3892         int ret;
3893
3894         ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
3895         if (ret)
3896                 return ret;
3897         ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
3898                                                &vi->node_dead);
3899         if (!ret)
3900                 return ret;
3901         cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
3902         return ret;
3903 }
3904
3905 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
3906 {
3907         cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
3908         cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
3909                                             &vi->node_dead);
3910 }
3911
3912 static int virtnet_send_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3913                                          u16 vqn, u32 max_usecs, u32 max_packets)
3914 {
3915         struct virtio_net_ctrl_coal_vq *coal_vq __free(kfree) = NULL;
3916         struct scatterlist sgs;
3917
3918         coal_vq = kzalloc(sizeof(*coal_vq), GFP_KERNEL);
3919         if (!coal_vq)
3920                 return -ENOMEM;
3921
3922         coal_vq->vqn = cpu_to_le16(vqn);
3923         coal_vq->coal.max_usecs = cpu_to_le32(max_usecs);
3924         coal_vq->coal.max_packets = cpu_to_le32(max_packets);
3925         sg_init_one(&sgs, coal_vq, sizeof(*coal_vq));
3926
3927         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
3928                                   VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET,
3929                                   &sgs))
3930                 return -EINVAL;
3931
3932         return 0;
3933 }
3934
3935 static int virtnet_send_rx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3936                                             u16 queue, u32 max_usecs,
3937                                             u32 max_packets)
3938 {
3939         int err;
3940
3941         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3942                 return -EOPNOTSUPP;
3943
3944         err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
3945                                             max_usecs, max_packets);
3946         if (err)
3947                 return err;
3948
3949         vi->rq[queue].intr_coal.max_usecs = max_usecs;
3950         vi->rq[queue].intr_coal.max_packets = max_packets;
3951
3952         return 0;
3953 }
3954
3955 static int virtnet_send_tx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3956                                             u16 queue, u32 max_usecs,
3957                                             u32 max_packets)
3958 {
3959         int err;
3960
3961         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3962                 return -EOPNOTSUPP;
3963
3964         err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
3965                                             max_usecs, max_packets);
3966         if (err)
3967                 return err;
3968
3969         vi->sq[queue].intr_coal.max_usecs = max_usecs;
3970         vi->sq[queue].intr_coal.max_packets = max_packets;
3971
3972         return 0;
3973 }
3974
3975 static void virtnet_get_ringparam(struct net_device *dev,
3976                                   struct ethtool_ringparam *ring,
3977                                   struct kernel_ethtool_ringparam *kernel_ring,
3978                                   struct netlink_ext_ack *extack)
3979 {
3980         struct virtnet_info *vi = netdev_priv(dev);
3981
3982         ring->rx_max_pending = vi->rq[0].vq->num_max;
3983         ring->tx_max_pending = vi->sq[0].vq->num_max;
3984         ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
3985         ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
3986 }
3987
3988 static int virtnet_set_ringparam(struct net_device *dev,
3989                                  struct ethtool_ringparam *ring,
3990                                  struct kernel_ethtool_ringparam *kernel_ring,
3991                                  struct netlink_ext_ack *extack)
3992 {
3993         struct virtnet_info *vi = netdev_priv(dev);
3994         u32 rx_pending, tx_pending;
3995         struct receive_queue *rq;
3996         struct send_queue *sq;
3997         int i, err;
3998
3999         if (ring->rx_mini_pending || ring->rx_jumbo_pending)
4000                 return -EINVAL;
4001
4002         rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
4003         tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
4004
4005         if (ring->rx_pending == rx_pending &&
4006             ring->tx_pending == tx_pending)
4007                 return 0;
4008
4009         if (ring->rx_pending > vi->rq[0].vq->num_max)
4010                 return -EINVAL;
4011
4012         if (ring->tx_pending > vi->sq[0].vq->num_max)
4013                 return -EINVAL;
4014
4015         for (i = 0; i < vi->max_queue_pairs; i++) {
4016                 rq = vi->rq + i;
4017                 sq = vi->sq + i;
4018
4019                 if (ring->tx_pending != tx_pending) {
4020                         err = virtnet_tx_resize(vi, sq, ring->tx_pending);
4021                         if (err)
4022                                 return err;
4023
4024                         /* Upon disabling and re-enabling a transmit virtqueue, the device must
4025                          * set the coalescing parameters of the virtqueue to those configured
4026                          * through the VIRTIO_NET_CTRL_NOTF_COAL_TX_SET command, or, if the driver
4027                          * did not set any TX coalescing parameters, to 0.
4028                          */
4029                         err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, i,
4030                                                                vi->intr_coal_tx.max_usecs,
4031                                                                vi->intr_coal_tx.max_packets);
4032
4033                         /* Don't break the tx resize action if the vq coalescing is not
4034                          * supported. The same is true for rx resize below.
4035                          */
4036                         if (err && err != -EOPNOTSUPP)
4037                                 return err;
4038                 }
4039
4040                 if (ring->rx_pending != rx_pending) {
4041                         err = virtnet_rx_resize(vi, rq, ring->rx_pending);
4042                         if (err)
4043                                 return err;
4044
4045                         /* The reason is same as the transmit virtqueue reset */
4046                         mutex_lock(&vi->rq[i].dim_lock);
4047                         err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, i,
4048                                                                vi->intr_coal_rx.max_usecs,
4049                                                                vi->intr_coal_rx.max_packets);
4050                         mutex_unlock(&vi->rq[i].dim_lock);
4051                         if (err && err != -EOPNOTSUPP)
4052                                 return err;
4053                 }
4054         }
4055
4056         return 0;
4057 }
4058
4059 static bool virtnet_commit_rss_command(struct virtnet_info *vi)
4060 {
4061         struct net_device *dev = vi->dev;
4062         struct scatterlist sgs[4];
4063         unsigned int sg_buf_size;
4064
4065         /* prepare sgs */
4066         sg_init_table(sgs, 4);
4067
4068         sg_buf_size = offsetof(struct virtio_net_ctrl_rss, hash_cfg_reserved);
4069         sg_set_buf(&sgs[0], &vi->rss, sg_buf_size);
4070
4071         if (vi->has_rss) {
4072                 sg_buf_size = sizeof(uint16_t) * vi->rss_indir_table_size;
4073                 sg_set_buf(&sgs[1], vi->rss.indirection_table, sg_buf_size);
4074         } else {
4075                 sg_set_buf(&sgs[1], &vi->rss.hash_cfg_reserved, sizeof(uint16_t));
4076         }
4077
4078         sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key)
4079                         - offsetof(struct virtio_net_ctrl_rss, max_tx_vq);
4080         sg_set_buf(&sgs[2], &vi->rss.max_tx_vq, sg_buf_size);
4081
4082         sg_buf_size = vi->rss_key_size;
4083         sg_set_buf(&sgs[3], vi->rss.key, sg_buf_size);
4084
4085         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
4086                                   vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
4087                                   : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs))
4088                 goto err;
4089
4090         return true;
4091
4092 err:
4093         dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
4094         return false;
4095
4096 }
4097
4098 static void virtnet_init_default_rss(struct virtnet_info *vi)
4099 {
4100         vi->rss.hash_types = vi->rss_hash_types_supported;
4101         vi->rss_hash_types_saved = vi->rss_hash_types_supported;
4102         vi->rss.indirection_table_mask = vi->rss_indir_table_size
4103                                                 ? vi->rss_indir_table_size - 1 : 0;
4104         vi->rss.unclassified_queue = 0;
4105
4106         virtnet_rss_update_by_qpairs(vi, vi->curr_queue_pairs);
4107
4108         vi->rss.hash_key_length = vi->rss_key_size;
4109
4110         netdev_rss_key_fill(vi->rss.key, vi->rss_key_size);
4111 }
4112
4113 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info)
4114 {
4115         info->data = 0;
4116         switch (info->flow_type) {
4117         case TCP_V4_FLOW:
4118                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
4119                         info->data = RXH_IP_SRC | RXH_IP_DST |
4120                                                  RXH_L4_B_0_1 | RXH_L4_B_2_3;
4121                 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
4122                         info->data = RXH_IP_SRC | RXH_IP_DST;
4123                 }
4124                 break;
4125         case TCP_V6_FLOW:
4126                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
4127                         info->data = RXH_IP_SRC | RXH_IP_DST |
4128                                                  RXH_L4_B_0_1 | RXH_L4_B_2_3;
4129                 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
4130                         info->data = RXH_IP_SRC | RXH_IP_DST;
4131                 }
4132                 break;
4133         case UDP_V4_FLOW:
4134                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
4135                         info->data = RXH_IP_SRC | RXH_IP_DST |
4136                                                  RXH_L4_B_0_1 | RXH_L4_B_2_3;
4137                 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
4138                         info->data = RXH_IP_SRC | RXH_IP_DST;
4139                 }
4140                 break;
4141         case UDP_V6_FLOW:
4142                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
4143                         info->data = RXH_IP_SRC | RXH_IP_DST |
4144                                                  RXH_L4_B_0_1 | RXH_L4_B_2_3;
4145                 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
4146                         info->data = RXH_IP_SRC | RXH_IP_DST;
4147                 }
4148                 break;
4149         case IPV4_FLOW:
4150                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
4151                         info->data = RXH_IP_SRC | RXH_IP_DST;
4152
4153                 break;
4154         case IPV6_FLOW:
4155                 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6)
4156                         info->data = RXH_IP_SRC | RXH_IP_DST;
4157
4158                 break;
4159         default:
4160                 info->data = 0;
4161                 break;
4162         }
4163 }
4164
4165 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info)
4166 {
4167         u32 new_hashtypes = vi->rss_hash_types_saved;
4168         bool is_disable = info->data & RXH_DISCARD;
4169         bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3);
4170
4171         /* supports only 'sd', 'sdfn' and 'r' */
4172         if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable))
4173                 return false;
4174
4175         switch (info->flow_type) {
4176         case TCP_V4_FLOW:
4177                 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4);
4178                 if (!is_disable)
4179                         new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
4180                                 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0);
4181                 break;
4182         case UDP_V4_FLOW:
4183                 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4);
4184                 if (!is_disable)
4185                         new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
4186                                 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0);
4187                 break;
4188         case IPV4_FLOW:
4189                 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4;
4190                 if (!is_disable)
4191                         new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4;
4192                 break;
4193         case TCP_V6_FLOW:
4194                 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6);
4195                 if (!is_disable)
4196                         new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
4197                                 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0);
4198                 break;
4199         case UDP_V6_FLOW:
4200                 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6);
4201                 if (!is_disable)
4202                         new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
4203                                 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0);
4204                 break;
4205         case IPV6_FLOW:
4206                 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6;
4207                 if (!is_disable)
4208                         new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6;
4209                 break;
4210         default:
4211                 /* unsupported flow */
4212                 return false;
4213         }
4214
4215         /* if unsupported hashtype was set */
4216         if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported))
4217                 return false;
4218
4219         if (new_hashtypes != vi->rss_hash_types_saved) {
4220                 vi->rss_hash_types_saved = new_hashtypes;
4221                 vi->rss.hash_types = vi->rss_hash_types_saved;
4222                 if (vi->dev->features & NETIF_F_RXHASH)
4223                         return virtnet_commit_rss_command(vi);
4224         }
4225
4226         return true;
4227 }
4228
4229 static void virtnet_get_drvinfo(struct net_device *dev,
4230                                 struct ethtool_drvinfo *info)
4231 {
4232         struct virtnet_info *vi = netdev_priv(dev);
4233         struct virtio_device *vdev = vi->vdev;
4234
4235         strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
4236         strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
4237         strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
4238
4239 }
4240
4241 /* TODO: Eliminate OOO packets during switching */
4242 static int virtnet_set_channels(struct net_device *dev,
4243                                 struct ethtool_channels *channels)
4244 {
4245         struct virtnet_info *vi = netdev_priv(dev);
4246         u16 queue_pairs = channels->combined_count;
4247         int err;
4248
4249         /* We don't support separate rx/tx channels.
4250          * We don't allow setting 'other' channels.
4251          */
4252         if (channels->rx_count || channels->tx_count || channels->other_count)
4253                 return -EINVAL;
4254
4255         if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
4256                 return -EINVAL;
4257
4258         /* For now we don't support modifying channels while XDP is loaded
4259          * also when XDP is loaded all RX queues have XDP programs so we only
4260          * need to check a single RX queue.
4261          */
4262         if (vi->rq[0].xdp_prog)
4263                 return -EINVAL;
4264
4265         cpus_read_lock();
4266         err = virtnet_set_queues(vi, queue_pairs);
4267         if (err) {
4268                 cpus_read_unlock();
4269                 goto err;
4270         }
4271         virtnet_set_affinity(vi);
4272         cpus_read_unlock();
4273
4274         netif_set_real_num_tx_queues(dev, queue_pairs);
4275         netif_set_real_num_rx_queues(dev, queue_pairs);
4276  err:
4277         return err;
4278 }
4279
4280 static void virtnet_stats_sprintf(u8 **p, const char *fmt, const char *noq_fmt,
4281                                   int num, int qid, const struct virtnet_stat_desc *desc)
4282 {
4283         int i;
4284
4285         if (qid < 0) {
4286                 for (i = 0; i < num; ++i)
4287                         ethtool_sprintf(p, noq_fmt, desc[i].desc);
4288         } else {
4289                 for (i = 0; i < num; ++i)
4290                         ethtool_sprintf(p, fmt, qid, desc[i].desc);
4291         }
4292 }
4293
4294 /* qid == -1: for rx/tx queue total field */
4295 static void virtnet_get_stats_string(struct virtnet_info *vi, int type, int qid, u8 **data)
4296 {
4297         const struct virtnet_stat_desc *desc;
4298         const char *fmt, *noq_fmt;
4299         u8 *p = *data;
4300         u32 num;
4301
4302         if (type == VIRTNET_Q_TYPE_CQ && qid >= 0) {
4303                 noq_fmt = "cq_hw_%s";
4304
4305                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_CVQ) {
4306                         desc = &virtnet_stats_cvq_desc[0];
4307                         num = ARRAY_SIZE(virtnet_stats_cvq_desc);
4308
4309                         virtnet_stats_sprintf(&p, NULL, noq_fmt, num, -1, desc);
4310                 }
4311         }
4312
4313         if (type == VIRTNET_Q_TYPE_RX) {
4314                 fmt = "rx%u_%s";
4315                 noq_fmt = "rx_%s";
4316
4317                 desc = &virtnet_rq_stats_desc[0];
4318                 num = ARRAY_SIZE(virtnet_rq_stats_desc);
4319
4320                 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4321
4322                 fmt = "rx%u_hw_%s";
4323                 noq_fmt = "rx_hw_%s";
4324
4325                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4326                         desc = &virtnet_stats_rx_basic_desc[0];
4327                         num = ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4328
4329                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4330                 }
4331
4332                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4333                         desc = &virtnet_stats_rx_csum_desc[0];
4334                         num = ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4335
4336                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4337                 }
4338
4339                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4340                         desc = &virtnet_stats_rx_speed_desc[0];
4341                         num = ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4342
4343                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4344                 }
4345         }
4346
4347         if (type == VIRTNET_Q_TYPE_TX) {
4348                 fmt = "tx%u_%s";
4349                 noq_fmt = "tx_%s";
4350
4351                 desc = &virtnet_sq_stats_desc[0];
4352                 num = ARRAY_SIZE(virtnet_sq_stats_desc);
4353
4354                 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4355
4356                 fmt = "tx%u_hw_%s";
4357                 noq_fmt = "tx_hw_%s";
4358
4359                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4360                         desc = &virtnet_stats_tx_basic_desc[0];
4361                         num = ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4362
4363                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4364                 }
4365
4366                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4367                         desc = &virtnet_stats_tx_gso_desc[0];
4368                         num = ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4369
4370                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4371                 }
4372
4373                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4374                         desc = &virtnet_stats_tx_speed_desc[0];
4375                         num = ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4376
4377                         virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4378                 }
4379         }
4380
4381         *data = p;
4382 }
4383
4384 struct virtnet_stats_ctx {
4385         /* The stats are write to qstats or ethtool -S */
4386         bool to_qstat;
4387
4388         /* Used to calculate the offset inside the output buffer. */
4389         u32 desc_num[3];
4390
4391         /* The actual supported stat types. */
4392         u64 bitmap[3];
4393
4394         /* Used to calculate the reply buffer size. */
4395         u32 size[3];
4396
4397         /* Record the output buffer. */
4398         u64 *data;
4399 };
4400
4401 static void virtnet_stats_ctx_init(struct virtnet_info *vi,
4402                                    struct virtnet_stats_ctx *ctx,
4403                                    u64 *data, bool to_qstat)
4404 {
4405         u32 queue_type;
4406
4407         ctx->data = data;
4408         ctx->to_qstat = to_qstat;
4409
4410         if (to_qstat) {
4411                 ctx->desc_num[VIRTNET_Q_TYPE_RX] = ARRAY_SIZE(virtnet_rq_stats_desc_qstat);
4412                 ctx->desc_num[VIRTNET_Q_TYPE_TX] = ARRAY_SIZE(virtnet_sq_stats_desc_qstat);
4413
4414                 queue_type = VIRTNET_Q_TYPE_RX;
4415
4416                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4417                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_BASIC;
4418                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_basic_desc_qstat);
4419                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_basic);
4420                 }
4421
4422                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4423                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_CSUM;
4424                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_csum_desc_qstat);
4425                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_csum);
4426                 }
4427
4428                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
4429                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_GSO;
4430                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_gso_desc_qstat);
4431                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_gso);
4432                 }
4433
4434                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4435                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_SPEED;
4436                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_speed_desc_qstat);
4437                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_speed);
4438                 }
4439
4440                 queue_type = VIRTNET_Q_TYPE_TX;
4441
4442                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4443                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_BASIC;
4444                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_basic_desc_qstat);
4445                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_basic);
4446                 }
4447
4448                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
4449                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_CSUM;
4450                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_csum_desc_qstat);
4451                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_csum);
4452                 }
4453
4454                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4455                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_GSO;
4456                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_gso_desc_qstat);
4457                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_gso);
4458                 }
4459
4460                 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4461                         ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_SPEED;
4462                         ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_speed_desc_qstat);
4463                         ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_speed);
4464                 }
4465
4466                 return;
4467         }
4468
4469         ctx->desc_num[VIRTNET_Q_TYPE_RX] = ARRAY_SIZE(virtnet_rq_stats_desc);
4470         ctx->desc_num[VIRTNET_Q_TYPE_TX] = ARRAY_SIZE(virtnet_sq_stats_desc);
4471
4472         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_CVQ) {
4473                 queue_type = VIRTNET_Q_TYPE_CQ;
4474
4475                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_CVQ;
4476                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_cvq_desc);
4477                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_cvq);
4478         }
4479
4480         queue_type = VIRTNET_Q_TYPE_RX;
4481
4482         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4483                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_BASIC;
4484                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4485                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_basic);
4486         }
4487
4488         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4489                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_CSUM;
4490                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4491                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_csum);
4492         }
4493
4494         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4495                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_RX_SPEED;
4496                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4497                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_rx_speed);
4498         }
4499
4500         queue_type = VIRTNET_Q_TYPE_TX;
4501
4502         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4503                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_BASIC;
4504                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4505                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_basic);
4506         }
4507
4508         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4509                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_GSO;
4510                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4511                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_gso);
4512         }
4513
4514         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4515                 ctx->bitmap[queue_type]   |= VIRTIO_NET_STATS_TYPE_TX_SPEED;
4516                 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4517                 ctx->size[queue_type]     += sizeof(struct virtio_net_stats_tx_speed);
4518         }
4519 }
4520
4521 /* stats_sum_queue - Calculate the sum of the same fields in sq or rq.
4522  * @sum: the position to store the sum values
4523  * @num: field num
4524  * @q_value: the first queue fields
4525  * @q_num: number of the queues
4526  */
4527 static void stats_sum_queue(u64 *sum, u32 num, u64 *q_value, u32 q_num)
4528 {
4529         u32 step = num;
4530         int i, j;
4531         u64 *p;
4532
4533         for (i = 0; i < num; ++i) {
4534                 p = sum + i;
4535                 *p = 0;
4536
4537                 for (j = 0; j < q_num; ++j)
4538                         *p += *(q_value + i + j * step);
4539         }
4540 }
4541
4542 static void virtnet_fill_total_fields(struct virtnet_info *vi,
4543                                       struct virtnet_stats_ctx *ctx)
4544 {
4545         u64 *data, *first_rx_q, *first_tx_q;
4546         u32 num_cq, num_rx, num_tx;
4547
4548         num_cq = ctx->desc_num[VIRTNET_Q_TYPE_CQ];
4549         num_rx = ctx->desc_num[VIRTNET_Q_TYPE_RX];
4550         num_tx = ctx->desc_num[VIRTNET_Q_TYPE_TX];
4551
4552         first_rx_q = ctx->data + num_rx + num_tx + num_cq;
4553         first_tx_q = first_rx_q + vi->curr_queue_pairs * num_rx;
4554
4555         data = ctx->data;
4556
4557         stats_sum_queue(data, num_rx, first_rx_q, vi->curr_queue_pairs);
4558
4559         data = ctx->data + num_rx;
4560
4561         stats_sum_queue(data, num_tx, first_tx_q, vi->curr_queue_pairs);
4562 }
4563
4564 static void virtnet_fill_stats_qstat(struct virtnet_info *vi, u32 qid,
4565                                      struct virtnet_stats_ctx *ctx,
4566                                      const u8 *base, bool drv_stats, u8 reply_type)
4567 {
4568         const struct virtnet_stat_desc *desc;
4569         const u64_stats_t *v_stat;
4570         u64 offset, bitmap;
4571         const __le64 *v;
4572         u32 queue_type;
4573         int i, num;
4574
4575         queue_type = vq_type(vi, qid);
4576         bitmap = ctx->bitmap[queue_type];
4577
4578         if (drv_stats) {
4579                 if (queue_type == VIRTNET_Q_TYPE_RX) {
4580                         desc = &virtnet_rq_stats_desc_qstat[0];
4581                         num = ARRAY_SIZE(virtnet_rq_stats_desc_qstat);
4582                 } else {
4583                         desc = &virtnet_sq_stats_desc_qstat[0];
4584                         num = ARRAY_SIZE(virtnet_sq_stats_desc_qstat);
4585                 }
4586
4587                 for (i = 0; i < num; ++i) {
4588                         offset = desc[i].qstat_offset / sizeof(*ctx->data);
4589                         v_stat = (const u64_stats_t *)(base + desc[i].offset);
4590                         ctx->data[offset] = u64_stats_read(v_stat);
4591                 }
4592                 return;
4593         }
4594
4595         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4596                 desc = &virtnet_stats_rx_basic_desc_qstat[0];
4597                 num = ARRAY_SIZE(virtnet_stats_rx_basic_desc_qstat);
4598                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_BASIC)
4599                         goto found;
4600         }
4601
4602         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4603                 desc = &virtnet_stats_rx_csum_desc_qstat[0];
4604                 num = ARRAY_SIZE(virtnet_stats_rx_csum_desc_qstat);
4605                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_CSUM)
4606                         goto found;
4607         }
4608
4609         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
4610                 desc = &virtnet_stats_rx_gso_desc_qstat[0];
4611                 num = ARRAY_SIZE(virtnet_stats_rx_gso_desc_qstat);
4612                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_GSO)
4613                         goto found;
4614         }
4615
4616         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4617                 desc = &virtnet_stats_rx_speed_desc_qstat[0];
4618                 num = ARRAY_SIZE(virtnet_stats_rx_speed_desc_qstat);
4619                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_SPEED)
4620                         goto found;
4621         }
4622
4623         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4624                 desc = &virtnet_stats_tx_basic_desc_qstat[0];
4625                 num = ARRAY_SIZE(virtnet_stats_tx_basic_desc_qstat);
4626                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_BASIC)
4627                         goto found;
4628         }
4629
4630         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
4631                 desc = &virtnet_stats_tx_csum_desc_qstat[0];
4632                 num = ARRAY_SIZE(virtnet_stats_tx_csum_desc_qstat);
4633                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_CSUM)
4634                         goto found;
4635         }
4636
4637         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4638                 desc = &virtnet_stats_tx_gso_desc_qstat[0];
4639                 num = ARRAY_SIZE(virtnet_stats_tx_gso_desc_qstat);
4640                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_GSO)
4641                         goto found;
4642         }
4643
4644         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4645                 desc = &virtnet_stats_tx_speed_desc_qstat[0];
4646                 num = ARRAY_SIZE(virtnet_stats_tx_speed_desc_qstat);
4647                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_SPEED)
4648                         goto found;
4649         }
4650
4651         return;
4652
4653 found:
4654         for (i = 0; i < num; ++i) {
4655                 offset = desc[i].qstat_offset / sizeof(*ctx->data);
4656                 v = (const __le64 *)(base + desc[i].offset);
4657                 ctx->data[offset] = le64_to_cpu(*v);
4658         }
4659 }
4660
4661 /* virtnet_fill_stats - copy the stats to qstats or ethtool -S
4662  * The stats source is the device or the driver.
4663  *
4664  * @vi: virtio net info
4665  * @qid: the vq id
4666  * @ctx: stats ctx (initiated by virtnet_stats_ctx_init())
4667  * @base: pointer to the device reply or the driver stats structure.
4668  * @drv_stats: designate the base type (device reply, driver stats)
4669  * @type: the type of the device reply (if drv_stats is true, this must be zero)
4670  */
4671 static void virtnet_fill_stats(struct virtnet_info *vi, u32 qid,
4672                                struct virtnet_stats_ctx *ctx,
4673                                const u8 *base, bool drv_stats, u8 reply_type)
4674 {
4675         u32 queue_type, num_rx, num_tx, num_cq;
4676         const struct virtnet_stat_desc *desc;
4677         const u64_stats_t *v_stat;
4678         u64 offset, bitmap;
4679         const __le64 *v;
4680         int i, num;
4681
4682         if (ctx->to_qstat)
4683                 return virtnet_fill_stats_qstat(vi, qid, ctx, base, drv_stats, reply_type);
4684
4685         num_cq = ctx->desc_num[VIRTNET_Q_TYPE_CQ];
4686         num_rx = ctx->desc_num[VIRTNET_Q_TYPE_RX];
4687         num_tx = ctx->desc_num[VIRTNET_Q_TYPE_TX];
4688
4689         queue_type = vq_type(vi, qid);
4690         bitmap = ctx->bitmap[queue_type];
4691
4692         /* skip the total fields of pairs */
4693         offset = num_rx + num_tx;
4694
4695         if (queue_type == VIRTNET_Q_TYPE_TX) {
4696                 offset += num_cq + num_rx * vi->curr_queue_pairs + num_tx * (qid / 2);
4697
4698                 num = ARRAY_SIZE(virtnet_sq_stats_desc);
4699                 if (drv_stats) {
4700                         desc = &virtnet_sq_stats_desc[0];
4701                         goto drv_stats;
4702                 }
4703
4704                 offset += num;
4705
4706         } else if (queue_type == VIRTNET_Q_TYPE_RX) {
4707                 offset += num_cq + num_rx * (qid / 2);
4708
4709                 num = ARRAY_SIZE(virtnet_rq_stats_desc);
4710                 if (drv_stats) {
4711                         desc = &virtnet_rq_stats_desc[0];
4712                         goto drv_stats;
4713                 }
4714
4715                 offset += num;
4716         }
4717
4718         if (bitmap & VIRTIO_NET_STATS_TYPE_CVQ) {
4719                 desc = &virtnet_stats_cvq_desc[0];
4720                 num = ARRAY_SIZE(virtnet_stats_cvq_desc);
4721                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_CVQ)
4722                         goto found;
4723
4724                 offset += num;
4725         }
4726
4727         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4728                 desc = &virtnet_stats_rx_basic_desc[0];
4729                 num = ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4730                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_BASIC)
4731                         goto found;
4732
4733                 offset += num;
4734         }
4735
4736         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4737                 desc = &virtnet_stats_rx_csum_desc[0];
4738                 num = ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4739                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_CSUM)
4740                         goto found;
4741
4742                 offset += num;
4743         }
4744
4745         if (bitmap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4746                 desc = &virtnet_stats_rx_speed_desc[0];
4747                 num = ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4748                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_SPEED)
4749                         goto found;
4750
4751                 offset += num;
4752         }
4753
4754         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4755                 desc = &virtnet_stats_tx_basic_desc[0];
4756                 num = ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4757                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_BASIC)
4758                         goto found;
4759
4760                 offset += num;
4761         }
4762
4763         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4764                 desc = &virtnet_stats_tx_gso_desc[0];
4765                 num = ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4766                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_GSO)
4767                         goto found;
4768
4769                 offset += num;
4770         }
4771
4772         if (bitmap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4773                 desc = &virtnet_stats_tx_speed_desc[0];
4774                 num = ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4775                 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_SPEED)
4776                         goto found;
4777
4778                 offset += num;
4779         }
4780
4781         return;
4782
4783 found:
4784         for (i = 0; i < num; ++i) {
4785                 v = (const __le64 *)(base + desc[i].offset);
4786                 ctx->data[offset + i] = le64_to_cpu(*v);
4787         }
4788
4789         return;
4790
4791 drv_stats:
4792         for (i = 0; i < num; ++i) {
4793                 v_stat = (const u64_stats_t *)(base + desc[i].offset);
4794                 ctx->data[offset + i] = u64_stats_read(v_stat);
4795         }
4796 }
4797
4798 static int __virtnet_get_hw_stats(struct virtnet_info *vi,
4799                                   struct virtnet_stats_ctx *ctx,
4800                                   struct virtio_net_ctrl_queue_stats *req,
4801                                   int req_size, void *reply, int res_size)
4802 {
4803         struct virtio_net_stats_reply_hdr *hdr;
4804         struct scatterlist sgs_in, sgs_out;
4805         void *p;
4806         u32 qid;
4807         int ok;
4808
4809         sg_init_one(&sgs_out, req, req_size);
4810         sg_init_one(&sgs_in, reply, res_size);
4811
4812         ok = virtnet_send_command_reply(vi, VIRTIO_NET_CTRL_STATS,
4813                                         VIRTIO_NET_CTRL_STATS_GET,
4814                                         &sgs_out, &sgs_in);
4815
4816         if (!ok)
4817                 return ok;
4818
4819         for (p = reply; p - reply < res_size; p += le16_to_cpu(hdr->size)) {
4820                 hdr = p;
4821                 qid = le16_to_cpu(hdr->vq_index);
4822                 virtnet_fill_stats(vi, qid, ctx, p, false, hdr->type);
4823         }
4824
4825         return 0;
4826 }
4827
4828 static void virtnet_make_stat_req(struct virtnet_info *vi,
4829                                   struct virtnet_stats_ctx *ctx,
4830                                   struct virtio_net_ctrl_queue_stats *req,
4831                                   int qid, int *idx)
4832 {
4833         int qtype = vq_type(vi, qid);
4834         u64 bitmap = ctx->bitmap[qtype];
4835
4836         if (!bitmap)
4837                 return;
4838
4839         req->stats[*idx].vq_index = cpu_to_le16(qid);
4840         req->stats[*idx].types_bitmap[0] = cpu_to_le64(bitmap);
4841         *idx += 1;
4842 }
4843
4844 /* qid: -1: get stats of all vq.
4845  *     > 0: get the stats for the special vq. This must not be cvq.
4846  */
4847 static int virtnet_get_hw_stats(struct virtnet_info *vi,
4848                                 struct virtnet_stats_ctx *ctx, int qid)
4849 {
4850         int qnum, i, j, res_size, qtype, last_vq, first_vq;
4851         struct virtio_net_ctrl_queue_stats *req;
4852         bool enable_cvq;
4853         void *reply;
4854         int ok;
4855
4856         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS))
4857                 return 0;
4858
4859         if (qid == -1) {
4860                 last_vq = vi->curr_queue_pairs * 2 - 1;
4861                 first_vq = 0;
4862                 enable_cvq = true;
4863         } else {
4864                 last_vq = qid;
4865                 first_vq = qid;
4866                 enable_cvq = false;
4867         }
4868
4869         qnum = 0;
4870         res_size = 0;
4871         for (i = first_vq; i <= last_vq ; ++i) {
4872                 qtype = vq_type(vi, i);
4873                 if (ctx->bitmap[qtype]) {
4874                         ++qnum;
4875                         res_size += ctx->size[qtype];
4876                 }
4877         }
4878
4879         if (enable_cvq && ctx->bitmap[VIRTNET_Q_TYPE_CQ]) {
4880                 res_size += ctx->size[VIRTNET_Q_TYPE_CQ];
4881                 qnum += 1;
4882         }
4883
4884         req = kcalloc(qnum, sizeof(*req), GFP_KERNEL);
4885         if (!req)
4886                 return -ENOMEM;
4887
4888         reply = kmalloc(res_size, GFP_KERNEL);
4889         if (!reply) {
4890                 kfree(req);
4891                 return -ENOMEM;
4892         }
4893
4894         j = 0;
4895         for (i = first_vq; i <= last_vq ; ++i)
4896                 virtnet_make_stat_req(vi, ctx, req, i, &j);
4897
4898         if (enable_cvq)
4899                 virtnet_make_stat_req(vi, ctx, req, vi->max_queue_pairs * 2, &j);
4900
4901         ok = __virtnet_get_hw_stats(vi, ctx, req, sizeof(*req) * j, reply, res_size);
4902
4903         kfree(req);
4904         kfree(reply);
4905
4906         return ok;
4907 }
4908
4909 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
4910 {
4911         struct virtnet_info *vi = netdev_priv(dev);
4912         unsigned int i;
4913         u8 *p = data;
4914
4915         switch (stringset) {
4916         case ETH_SS_STATS:
4917                 /* Generate the total field names. */
4918                 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_RX, -1, &p);
4919                 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_TX, -1, &p);
4920
4921                 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_CQ, 0, &p);
4922
4923                 for (i = 0; i < vi->curr_queue_pairs; ++i)
4924                         virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_RX, i, &p);
4925
4926                 for (i = 0; i < vi->curr_queue_pairs; ++i)
4927                         virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_TX, i, &p);
4928                 break;
4929         }
4930 }
4931
4932 static int virtnet_get_sset_count(struct net_device *dev, int sset)
4933 {
4934         struct virtnet_info *vi = netdev_priv(dev);
4935         struct virtnet_stats_ctx ctx = {0};
4936         u32 pair_count;
4937
4938         switch (sset) {
4939         case ETH_SS_STATS:
4940                 virtnet_stats_ctx_init(vi, &ctx, NULL, false);
4941
4942                 pair_count = ctx.desc_num[VIRTNET_Q_TYPE_RX] + ctx.desc_num[VIRTNET_Q_TYPE_TX];
4943
4944                 return pair_count + ctx.desc_num[VIRTNET_Q_TYPE_CQ] +
4945                         vi->curr_queue_pairs * pair_count;
4946         default:
4947                 return -EOPNOTSUPP;
4948         }
4949 }
4950
4951 static void virtnet_get_ethtool_stats(struct net_device *dev,
4952                                       struct ethtool_stats *stats, u64 *data)
4953 {
4954         struct virtnet_info *vi = netdev_priv(dev);
4955         struct virtnet_stats_ctx ctx = {0};
4956         unsigned int start, i;
4957         const u8 *stats_base;
4958
4959         virtnet_stats_ctx_init(vi, &ctx, data, false);
4960         if (virtnet_get_hw_stats(vi, &ctx, -1))
4961                 dev_warn(&vi->dev->dev, "Failed to get hw stats.\n");
4962
4963         for (i = 0; i < vi->curr_queue_pairs; i++) {
4964                 struct receive_queue *rq = &vi->rq[i];
4965                 struct send_queue *sq = &vi->sq[i];
4966
4967                 stats_base = (const u8 *)&rq->stats;
4968                 do {
4969                         start = u64_stats_fetch_begin(&rq->stats.syncp);
4970                         virtnet_fill_stats(vi, i * 2, &ctx, stats_base, true, 0);
4971                 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
4972
4973                 stats_base = (const u8 *)&sq->stats;
4974                 do {
4975                         start = u64_stats_fetch_begin(&sq->stats.syncp);
4976                         virtnet_fill_stats(vi, i * 2 + 1, &ctx, stats_base, true, 0);
4977                 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
4978         }
4979
4980         virtnet_fill_total_fields(vi, &ctx);
4981 }
4982
4983 static void virtnet_get_channels(struct net_device *dev,
4984                                  struct ethtool_channels *channels)
4985 {
4986         struct virtnet_info *vi = netdev_priv(dev);
4987
4988         channels->combined_count = vi->curr_queue_pairs;
4989         channels->max_combined = vi->max_queue_pairs;
4990         channels->max_other = 0;
4991         channels->rx_count = 0;
4992         channels->tx_count = 0;
4993         channels->other_count = 0;
4994 }
4995
4996 static int virtnet_set_link_ksettings(struct net_device *dev,
4997                                       const struct ethtool_link_ksettings *cmd)
4998 {
4999         struct virtnet_info *vi = netdev_priv(dev);
5000
5001         return ethtool_virtdev_set_link_ksettings(dev, cmd,
5002                                                   &vi->speed, &vi->duplex);
5003 }
5004
5005 static int virtnet_get_link_ksettings(struct net_device *dev,
5006                                       struct ethtool_link_ksettings *cmd)
5007 {
5008         struct virtnet_info *vi = netdev_priv(dev);
5009
5010         cmd->base.speed = vi->speed;
5011         cmd->base.duplex = vi->duplex;
5012         cmd->base.port = PORT_OTHER;
5013
5014         return 0;
5015 }
5016
5017 static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
5018                                           struct ethtool_coalesce *ec)
5019 {
5020         struct virtio_net_ctrl_coal_tx *coal_tx __free(kfree) = NULL;
5021         struct scatterlist sgs_tx;
5022         int i;
5023
5024         coal_tx = kzalloc(sizeof(*coal_tx), GFP_KERNEL);
5025         if (!coal_tx)
5026                 return -ENOMEM;
5027
5028         coal_tx->tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
5029         coal_tx->tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
5030         sg_init_one(&sgs_tx, coal_tx, sizeof(*coal_tx));
5031
5032         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
5033                                   VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
5034                                   &sgs_tx))
5035                 return -EINVAL;
5036
5037         vi->intr_coal_tx.max_usecs = ec->tx_coalesce_usecs;
5038         vi->intr_coal_tx.max_packets = ec->tx_max_coalesced_frames;
5039         for (i = 0; i < vi->max_queue_pairs; i++) {
5040                 vi->sq[i].intr_coal.max_usecs = ec->tx_coalesce_usecs;
5041                 vi->sq[i].intr_coal.max_packets = ec->tx_max_coalesced_frames;
5042         }
5043
5044         return 0;
5045 }
5046
5047 static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
5048                                           struct ethtool_coalesce *ec)
5049 {
5050         struct virtio_net_ctrl_coal_rx *coal_rx __free(kfree) = NULL;
5051         bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
5052         struct scatterlist sgs_rx;
5053         int i;
5054
5055         if (rx_ctrl_dim_on && !virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
5056                 return -EOPNOTSUPP;
5057
5058         if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != vi->intr_coal_rx.max_usecs ||
5059                                ec->rx_max_coalesced_frames != vi->intr_coal_rx.max_packets))
5060                 return -EINVAL;
5061
5062         if (rx_ctrl_dim_on && !vi->rx_dim_enabled) {
5063                 vi->rx_dim_enabled = true;
5064                 for (i = 0; i < vi->max_queue_pairs; i++) {
5065                         mutex_lock(&vi->rq[i].dim_lock);
5066                         vi->rq[i].dim_enabled = true;
5067                         mutex_unlock(&vi->rq[i].dim_lock);
5068                 }
5069                 return 0;
5070         }
5071
5072         coal_rx = kzalloc(sizeof(*coal_rx), GFP_KERNEL);
5073         if (!coal_rx)
5074                 return -ENOMEM;
5075
5076         if (!rx_ctrl_dim_on && vi->rx_dim_enabled) {
5077                 vi->rx_dim_enabled = false;
5078                 for (i = 0; i < vi->max_queue_pairs; i++) {
5079                         mutex_lock(&vi->rq[i].dim_lock);
5080                         vi->rq[i].dim_enabled = false;
5081                         mutex_unlock(&vi->rq[i].dim_lock);
5082                 }
5083         }
5084
5085         /* Since the per-queue coalescing params can be set,
5086          * we need apply the global new params even if they
5087          * are not updated.
5088          */
5089         coal_rx->rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
5090         coal_rx->rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
5091         sg_init_one(&sgs_rx, coal_rx, sizeof(*coal_rx));
5092
5093         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
5094                                   VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
5095                                   &sgs_rx))
5096                 return -EINVAL;
5097
5098         vi->intr_coal_rx.max_usecs = ec->rx_coalesce_usecs;
5099         vi->intr_coal_rx.max_packets = ec->rx_max_coalesced_frames;
5100         for (i = 0; i < vi->max_queue_pairs; i++) {
5101                 mutex_lock(&vi->rq[i].dim_lock);
5102                 vi->rq[i].intr_coal.max_usecs = ec->rx_coalesce_usecs;
5103                 vi->rq[i].intr_coal.max_packets = ec->rx_max_coalesced_frames;
5104                 mutex_unlock(&vi->rq[i].dim_lock);
5105         }
5106
5107         return 0;
5108 }
5109
5110 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
5111                                        struct ethtool_coalesce *ec)
5112 {
5113         int err;
5114
5115         err = virtnet_send_tx_notf_coal_cmds(vi, ec);
5116         if (err)
5117                 return err;
5118
5119         err = virtnet_send_rx_notf_coal_cmds(vi, ec);
5120         if (err)
5121                 return err;
5122
5123         return 0;
5124 }
5125
5126 static int virtnet_send_rx_notf_coal_vq_cmds(struct virtnet_info *vi,
5127                                              struct ethtool_coalesce *ec,
5128                                              u16 queue)
5129 {
5130         bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
5131         u32 max_usecs, max_packets;
5132         bool cur_rx_dim;
5133         int err;
5134
5135         mutex_lock(&vi->rq[queue].dim_lock);
5136         cur_rx_dim = vi->rq[queue].dim_enabled;
5137         max_usecs = vi->rq[queue].intr_coal.max_usecs;
5138         max_packets = vi->rq[queue].intr_coal.max_packets;
5139
5140         if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != max_usecs ||
5141                                ec->rx_max_coalesced_frames != max_packets)) {
5142                 mutex_unlock(&vi->rq[queue].dim_lock);
5143                 return -EINVAL;
5144         }
5145
5146         if (rx_ctrl_dim_on && !cur_rx_dim) {
5147                 vi->rq[queue].dim_enabled = true;
5148                 mutex_unlock(&vi->rq[queue].dim_lock);
5149                 return 0;
5150         }
5151
5152         if (!rx_ctrl_dim_on && cur_rx_dim)
5153                 vi->rq[queue].dim_enabled = false;
5154
5155         /* If no params are updated, userspace ethtool will
5156          * reject the modification.
5157          */
5158         err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, queue,
5159                                                ec->rx_coalesce_usecs,
5160                                                ec->rx_max_coalesced_frames);
5161         mutex_unlock(&vi->rq[queue].dim_lock);
5162         return err;
5163 }
5164
5165 static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
5166                                           struct ethtool_coalesce *ec,
5167                                           u16 queue)
5168 {
5169         int err;
5170
5171         err = virtnet_send_rx_notf_coal_vq_cmds(vi, ec, queue);
5172         if (err)
5173                 return err;
5174
5175         err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
5176                                                ec->tx_coalesce_usecs,
5177                                                ec->tx_max_coalesced_frames);
5178         if (err)
5179                 return err;
5180
5181         return 0;
5182 }
5183
5184 static void virtnet_rx_dim_work(struct work_struct *work)
5185 {
5186         struct dim *dim = container_of(work, struct dim, work);
5187         struct receive_queue *rq = container_of(dim,
5188                         struct receive_queue, dim);
5189         struct virtnet_info *vi = rq->vq->vdev->priv;
5190         struct net_device *dev = vi->dev;
5191         struct dim_cq_moder update_moder;
5192         int qnum, err;
5193
5194         qnum = rq - vi->rq;
5195
5196         mutex_lock(&rq->dim_lock);
5197         if (!rq->dim_enabled)
5198                 goto out;
5199
5200         update_moder = net_dim_get_rx_irq_moder(dev, dim);
5201         if (update_moder.usec != rq->intr_coal.max_usecs ||
5202             update_moder.pkts != rq->intr_coal.max_packets) {
5203                 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, qnum,
5204                                                        update_moder.usec,
5205                                                        update_moder.pkts);
5206                 if (err)
5207                         pr_debug("%s: Failed to send dim parameters on rxq%d\n",
5208                                  dev->name, qnum);
5209         }
5210 out:
5211         dim->state = DIM_START_MEASURE;
5212         mutex_unlock(&rq->dim_lock);
5213 }
5214
5215 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec)
5216 {
5217         /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL
5218          * or VIRTIO_NET_F_VQ_NOTF_COAL feature is negotiated.
5219          */
5220         if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs)
5221                 return -EOPNOTSUPP;
5222
5223         if (ec->tx_max_coalesced_frames > 1 ||
5224             ec->rx_max_coalesced_frames != 1)
5225                 return -EINVAL;
5226
5227         return 0;
5228 }
5229
5230 static int virtnet_should_update_vq_weight(int dev_flags, int weight,
5231                                            int vq_weight, bool *should_update)
5232 {
5233         if (weight ^ vq_weight) {
5234                 if (dev_flags & IFF_UP)
5235                         return -EBUSY;
5236                 *should_update = true;
5237         }
5238
5239         return 0;
5240 }
5241
5242 static int virtnet_set_coalesce(struct net_device *dev,
5243                                 struct ethtool_coalesce *ec,
5244                                 struct kernel_ethtool_coalesce *kernel_coal,
5245                                 struct netlink_ext_ack *extack)
5246 {
5247         struct virtnet_info *vi = netdev_priv(dev);
5248         int ret, queue_number, napi_weight, i;
5249         bool update_napi = false;
5250
5251         /* Can't change NAPI weight if the link is up */
5252         napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
5253         for (queue_number = 0; queue_number < vi->max_queue_pairs; queue_number++) {
5254                 ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
5255                                                       vi->sq[queue_number].napi.weight,
5256                                                       &update_napi);
5257                 if (ret)
5258                         return ret;
5259
5260                 if (update_napi) {
5261                         /* All queues that belong to [queue_number, vi->max_queue_pairs] will be
5262                          * updated for the sake of simplicity, which might not be necessary
5263                          */
5264                         break;
5265                 }
5266         }
5267
5268         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL))
5269                 ret = virtnet_send_notf_coal_cmds(vi, ec);
5270         else
5271                 ret = virtnet_coal_params_supported(ec);
5272
5273         if (ret)
5274                 return ret;
5275
5276         if (update_napi) {
5277                 /* xsk xmit depends on the tx napi. So if xsk is active,
5278                  * prevent modifications to tx napi.
5279                  */
5280                 for (i = queue_number; i < vi->max_queue_pairs; i++) {
5281                         if (vi->sq[i].xsk_pool)
5282                                 return -EBUSY;
5283                 }
5284
5285                 for (; queue_number < vi->max_queue_pairs; queue_number++)
5286                         vi->sq[queue_number].napi.weight = napi_weight;
5287         }
5288
5289         return ret;
5290 }
5291
5292 static int virtnet_get_coalesce(struct net_device *dev,
5293                                 struct ethtool_coalesce *ec,
5294                                 struct kernel_ethtool_coalesce *kernel_coal,
5295                                 struct netlink_ext_ack *extack)
5296 {
5297         struct virtnet_info *vi = netdev_priv(dev);
5298
5299         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
5300                 ec->rx_coalesce_usecs = vi->intr_coal_rx.max_usecs;
5301                 ec->tx_coalesce_usecs = vi->intr_coal_tx.max_usecs;
5302                 ec->tx_max_coalesced_frames = vi->intr_coal_tx.max_packets;
5303                 ec->rx_max_coalesced_frames = vi->intr_coal_rx.max_packets;
5304                 ec->use_adaptive_rx_coalesce = vi->rx_dim_enabled;
5305         } else {
5306                 ec->rx_max_coalesced_frames = 1;
5307
5308                 if (vi->sq[0].napi.weight)
5309                         ec->tx_max_coalesced_frames = 1;
5310         }
5311
5312         return 0;
5313 }
5314
5315 static int virtnet_set_per_queue_coalesce(struct net_device *dev,
5316                                           u32 queue,
5317                                           struct ethtool_coalesce *ec)
5318 {
5319         struct virtnet_info *vi = netdev_priv(dev);
5320         int ret, napi_weight;
5321         bool update_napi = false;
5322
5323         if (queue >= vi->max_queue_pairs)
5324                 return -EINVAL;
5325
5326         /* Can't change NAPI weight if the link is up */
5327         napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
5328         ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
5329                                               vi->sq[queue].napi.weight,
5330                                               &update_napi);
5331         if (ret)
5332                 return ret;
5333
5334         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
5335                 ret = virtnet_send_notf_coal_vq_cmds(vi, ec, queue);
5336         else
5337                 ret = virtnet_coal_params_supported(ec);
5338
5339         if (ret)
5340                 return ret;
5341
5342         if (update_napi)
5343                 vi->sq[queue].napi.weight = napi_weight;
5344
5345         return 0;
5346 }
5347
5348 static int virtnet_get_per_queue_coalesce(struct net_device *dev,
5349                                           u32 queue,
5350                                           struct ethtool_coalesce *ec)
5351 {
5352         struct virtnet_info *vi = netdev_priv(dev);
5353
5354         if (queue >= vi->max_queue_pairs)
5355                 return -EINVAL;
5356
5357         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
5358                 mutex_lock(&vi->rq[queue].dim_lock);
5359                 ec->rx_coalesce_usecs = vi->rq[queue].intr_coal.max_usecs;
5360                 ec->tx_coalesce_usecs = vi->sq[queue].intr_coal.max_usecs;
5361                 ec->tx_max_coalesced_frames = vi->sq[queue].intr_coal.max_packets;
5362                 ec->rx_max_coalesced_frames = vi->rq[queue].intr_coal.max_packets;
5363                 ec->use_adaptive_rx_coalesce = vi->rq[queue].dim_enabled;
5364                 mutex_unlock(&vi->rq[queue].dim_lock);
5365         } else {
5366                 ec->rx_max_coalesced_frames = 1;
5367
5368                 if (vi->sq[queue].napi.weight)
5369                         ec->tx_max_coalesced_frames = 1;
5370         }
5371
5372         return 0;
5373 }
5374
5375 static void virtnet_init_settings(struct net_device *dev)
5376 {
5377         struct virtnet_info *vi = netdev_priv(dev);
5378
5379         vi->speed = SPEED_UNKNOWN;
5380         vi->duplex = DUPLEX_UNKNOWN;
5381 }
5382
5383 static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
5384 {
5385         return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
5386 }
5387
5388 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev)
5389 {
5390         return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size;
5391 }
5392
5393 static int virtnet_get_rxfh(struct net_device *dev,
5394                             struct ethtool_rxfh_param *rxfh)
5395 {
5396         struct virtnet_info *vi = netdev_priv(dev);
5397         int i;
5398
5399         if (rxfh->indir) {
5400                 for (i = 0; i < vi->rss_indir_table_size; ++i)
5401                         rxfh->indir[i] = vi->rss.indirection_table[i];
5402         }
5403
5404         if (rxfh->key)
5405                 memcpy(rxfh->key, vi->rss.key, vi->rss_key_size);
5406
5407         rxfh->hfunc = ETH_RSS_HASH_TOP;
5408
5409         return 0;
5410 }
5411
5412 static int virtnet_set_rxfh(struct net_device *dev,
5413                             struct ethtool_rxfh_param *rxfh,
5414                             struct netlink_ext_ack *extack)
5415 {
5416         struct virtnet_info *vi = netdev_priv(dev);
5417         bool update = false;
5418         int i;
5419
5420         if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
5421             rxfh->hfunc != ETH_RSS_HASH_TOP)
5422                 return -EOPNOTSUPP;
5423
5424         if (rxfh->indir) {
5425                 if (!vi->has_rss)
5426                         return -EOPNOTSUPP;
5427
5428                 for (i = 0; i < vi->rss_indir_table_size; ++i)
5429                         vi->rss.indirection_table[i] = rxfh->indir[i];
5430                 update = true;
5431         }
5432
5433         if (rxfh->key) {
5434                 /* If either _F_HASH_REPORT or _F_RSS are negotiated, the
5435                  * device provides hash calculation capabilities, that is,
5436                  * hash_key is configured.
5437                  */
5438                 if (!vi->has_rss && !vi->has_rss_hash_report)
5439                         return -EOPNOTSUPP;
5440
5441                 memcpy(vi->rss.key, rxfh->key, vi->rss_key_size);
5442                 update = true;
5443         }
5444
5445         if (update)
5446                 virtnet_commit_rss_command(vi);
5447
5448         return 0;
5449 }
5450
5451 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs)
5452 {
5453         struct virtnet_info *vi = netdev_priv(dev);
5454         int rc = 0;
5455
5456         switch (info->cmd) {
5457         case ETHTOOL_GRXRINGS:
5458                 info->data = vi->curr_queue_pairs;
5459                 break;
5460         case ETHTOOL_GRXFH:
5461                 virtnet_get_hashflow(vi, info);
5462                 break;
5463         default:
5464                 rc = -EOPNOTSUPP;
5465         }
5466
5467         return rc;
5468 }
5469
5470 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
5471 {
5472         struct virtnet_info *vi = netdev_priv(dev);
5473         int rc = 0;
5474
5475         switch (info->cmd) {
5476         case ETHTOOL_SRXFH:
5477                 if (!virtnet_set_hashflow(vi, info))
5478                         rc = -EINVAL;
5479
5480                 break;
5481         default:
5482                 rc = -EOPNOTSUPP;
5483         }
5484
5485         return rc;
5486 }
5487
5488 static const struct ethtool_ops virtnet_ethtool_ops = {
5489         .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
5490                 ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
5491         .get_drvinfo = virtnet_get_drvinfo,
5492         .get_link = ethtool_op_get_link,
5493         .get_ringparam = virtnet_get_ringparam,
5494         .set_ringparam = virtnet_set_ringparam,
5495         .get_strings = virtnet_get_strings,
5496         .get_sset_count = virtnet_get_sset_count,
5497         .get_ethtool_stats = virtnet_get_ethtool_stats,
5498         .set_channels = virtnet_set_channels,
5499         .get_channels = virtnet_get_channels,
5500         .get_ts_info = ethtool_op_get_ts_info,
5501         .get_link_ksettings = virtnet_get_link_ksettings,
5502         .set_link_ksettings = virtnet_set_link_ksettings,
5503         .set_coalesce = virtnet_set_coalesce,
5504         .get_coalesce = virtnet_get_coalesce,
5505         .set_per_queue_coalesce = virtnet_set_per_queue_coalesce,
5506         .get_per_queue_coalesce = virtnet_get_per_queue_coalesce,
5507         .get_rxfh_key_size = virtnet_get_rxfh_key_size,
5508         .get_rxfh_indir_size = virtnet_get_rxfh_indir_size,
5509         .get_rxfh = virtnet_get_rxfh,
5510         .set_rxfh = virtnet_set_rxfh,
5511         .get_rxnfc = virtnet_get_rxnfc,
5512         .set_rxnfc = virtnet_set_rxnfc,
5513 };
5514
5515 static void virtnet_get_queue_stats_rx(struct net_device *dev, int i,
5516                                        struct netdev_queue_stats_rx *stats)
5517 {
5518         struct virtnet_info *vi = netdev_priv(dev);
5519         struct receive_queue *rq = &vi->rq[i];
5520         struct virtnet_stats_ctx ctx = {0};
5521
5522         virtnet_stats_ctx_init(vi, &ctx, (void *)stats, true);
5523
5524         virtnet_get_hw_stats(vi, &ctx, i * 2);
5525         virtnet_fill_stats(vi, i * 2, &ctx, (void *)&rq->stats, true, 0);
5526 }
5527
5528 static void virtnet_get_queue_stats_tx(struct net_device *dev, int i,
5529                                        struct netdev_queue_stats_tx *stats)
5530 {
5531         struct virtnet_info *vi = netdev_priv(dev);
5532         struct send_queue *sq = &vi->sq[i];
5533         struct virtnet_stats_ctx ctx = {0};
5534
5535         virtnet_stats_ctx_init(vi, &ctx, (void *)stats, true);
5536
5537         virtnet_get_hw_stats(vi, &ctx, i * 2 + 1);
5538         virtnet_fill_stats(vi, i * 2 + 1, &ctx, (void *)&sq->stats, true, 0);
5539 }
5540
5541 static void virtnet_get_base_stats(struct net_device *dev,
5542                                    struct netdev_queue_stats_rx *rx,
5543                                    struct netdev_queue_stats_tx *tx)
5544 {
5545         struct virtnet_info *vi = netdev_priv(dev);
5546
5547         /* The queue stats of the virtio-net will not be reset. So here we
5548          * return 0.
5549          */
5550         rx->bytes = 0;
5551         rx->packets = 0;
5552
5553         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
5554                 rx->hw_drops = 0;
5555                 rx->hw_drop_overruns = 0;
5556         }
5557
5558         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
5559                 rx->csum_unnecessary = 0;
5560                 rx->csum_none = 0;
5561                 rx->csum_bad = 0;
5562         }
5563
5564         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
5565                 rx->hw_gro_packets = 0;
5566                 rx->hw_gro_bytes = 0;
5567                 rx->hw_gro_wire_packets = 0;
5568                 rx->hw_gro_wire_bytes = 0;
5569         }
5570
5571         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED)
5572                 rx->hw_drop_ratelimits = 0;
5573
5574         tx->bytes = 0;
5575         tx->packets = 0;
5576         tx->stop = 0;
5577         tx->wake = 0;
5578
5579         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
5580                 tx->hw_drops = 0;
5581                 tx->hw_drop_errors = 0;
5582         }
5583
5584         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
5585                 tx->csum_none = 0;
5586                 tx->needs_csum = 0;
5587         }
5588
5589         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
5590                 tx->hw_gso_packets = 0;
5591                 tx->hw_gso_bytes = 0;
5592                 tx->hw_gso_wire_packets = 0;
5593                 tx->hw_gso_wire_bytes = 0;
5594         }
5595
5596         if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED)
5597                 tx->hw_drop_ratelimits = 0;
5598 }
5599
5600 static const struct netdev_stat_ops virtnet_stat_ops = {
5601         .get_queue_stats_rx     = virtnet_get_queue_stats_rx,
5602         .get_queue_stats_tx     = virtnet_get_queue_stats_tx,
5603         .get_base_stats         = virtnet_get_base_stats,
5604 };
5605
5606 static void virtnet_freeze_down(struct virtio_device *vdev)
5607 {
5608         struct virtnet_info *vi = vdev->priv;
5609
5610         /* Make sure no work handler is accessing the device */
5611         flush_work(&vi->config_work);
5612         disable_rx_mode_work(vi);
5613         flush_work(&vi->rx_mode_work);
5614
5615         netif_tx_lock_bh(vi->dev);
5616         netif_device_detach(vi->dev);
5617         netif_tx_unlock_bh(vi->dev);
5618         if (netif_running(vi->dev))
5619                 virtnet_close(vi->dev);
5620 }
5621
5622 static int init_vqs(struct virtnet_info *vi);
5623
5624 static int virtnet_restore_up(struct virtio_device *vdev)
5625 {
5626         struct virtnet_info *vi = vdev->priv;
5627         int err;
5628
5629         err = init_vqs(vi);
5630         if (err)
5631                 return err;
5632
5633         virtio_device_ready(vdev);
5634
5635         enable_delayed_refill(vi);
5636         enable_rx_mode_work(vi);
5637
5638         if (netif_running(vi->dev)) {
5639                 err = virtnet_open(vi->dev);
5640                 if (err)
5641                         return err;
5642         }
5643
5644         netif_tx_lock_bh(vi->dev);
5645         netif_device_attach(vi->dev);
5646         netif_tx_unlock_bh(vi->dev);
5647         return err;
5648 }
5649
5650 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
5651 {
5652         __virtio64 *_offloads __free(kfree) = NULL;
5653         struct scatterlist sg;
5654
5655         _offloads = kzalloc(sizeof(*_offloads), GFP_KERNEL);
5656         if (!_offloads)
5657                 return -ENOMEM;
5658
5659         *_offloads = cpu_to_virtio64(vi->vdev, offloads);
5660
5661         sg_init_one(&sg, _offloads, sizeof(*_offloads));
5662
5663         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
5664                                   VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
5665                 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
5666                 return -EINVAL;
5667         }
5668
5669         return 0;
5670 }
5671
5672 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
5673 {
5674         u64 offloads = 0;
5675
5676         if (!vi->guest_offloads)
5677                 return 0;
5678
5679         return virtnet_set_guest_offloads(vi, offloads);
5680 }
5681
5682 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
5683 {
5684         u64 offloads = vi->guest_offloads;
5685
5686         if (!vi->guest_offloads)
5687                 return 0;
5688
5689         return virtnet_set_guest_offloads(vi, offloads);
5690 }
5691
5692 static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
5693                                     struct xsk_buff_pool *pool)
5694 {
5695         int err, qindex;
5696
5697         qindex = rq - vi->rq;
5698
5699         if (pool) {
5700                 err = xdp_rxq_info_reg(&rq->xsk_rxq_info, vi->dev, qindex, rq->napi.napi_id);
5701                 if (err < 0)
5702                         return err;
5703
5704                 err = xdp_rxq_info_reg_mem_model(&rq->xsk_rxq_info,
5705                                                  MEM_TYPE_XSK_BUFF_POOL, NULL);
5706                 if (err < 0)
5707                         goto unreg;
5708
5709                 xsk_pool_set_rxq_info(pool, &rq->xsk_rxq_info);
5710         }
5711
5712         virtnet_rx_pause(vi, rq);
5713
5714         err = virtqueue_reset(rq->vq, virtnet_rq_unmap_free_buf, NULL);
5715         if (err) {
5716                 netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: %d\n", qindex, err);
5717
5718                 pool = NULL;
5719         }
5720
5721         rq->xsk_pool = pool;
5722
5723         virtnet_rx_resume(vi, rq);
5724
5725         if (pool)
5726                 return 0;
5727
5728 unreg:
5729         xdp_rxq_info_unreg(&rq->xsk_rxq_info);
5730         return err;
5731 }
5732
5733 static int virtnet_sq_bind_xsk_pool(struct virtnet_info *vi,
5734                                     struct send_queue *sq,
5735                                     struct xsk_buff_pool *pool)
5736 {
5737         int err, qindex;
5738
5739         qindex = sq - vi->sq;
5740
5741         virtnet_tx_pause(vi, sq);
5742
5743         err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_buf,
5744                               virtnet_sq_free_unused_buf_done);
5745         if (err) {
5746                 netdev_err(vi->dev, "reset tx fail: tx queue index: %d err: %d\n", qindex, err);
5747                 pool = NULL;
5748         }
5749
5750         sq->xsk_pool = pool;
5751
5752         virtnet_tx_resume(vi, sq);
5753
5754         return err;
5755 }
5756
5757 static int virtnet_xsk_pool_enable(struct net_device *dev,
5758                                    struct xsk_buff_pool *pool,
5759                                    u16 qid)
5760 {
5761         struct virtnet_info *vi = netdev_priv(dev);
5762         struct receive_queue *rq;
5763         struct device *dma_dev;
5764         struct send_queue *sq;
5765         dma_addr_t hdr_dma;
5766         int err, size;
5767
5768         if (vi->hdr_len > xsk_pool_get_headroom(pool))
5769                 return -EINVAL;
5770
5771         /* In big_packets mode, xdp cannot work, so there is no need to
5772          * initialize xsk of rq.
5773          */
5774         if (vi->big_packets && !vi->mergeable_rx_bufs)
5775                 return -ENOENT;
5776
5777         if (qid >= vi->curr_queue_pairs)
5778                 return -EINVAL;
5779
5780         sq = &vi->sq[qid];
5781         rq = &vi->rq[qid];
5782
5783         /* xsk assumes that tx and rx must have the same dma device. The af-xdp
5784          * may use one buffer to receive from the rx and reuse this buffer to
5785          * send by the tx. So the dma dev of sq and rq must be the same one.
5786          *
5787          * But vq->dma_dev allows every vq has the respective dma dev. So I
5788          * check the dma dev of vq and sq is the same dev.
5789          */
5790         if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq))
5791                 return -EINVAL;
5792
5793         dma_dev = virtqueue_dma_dev(rq->vq);
5794         if (!dma_dev)
5795                 return -EINVAL;
5796
5797         size = virtqueue_get_vring_size(rq->vq);
5798
5799         rq->xsk_buffs = kvcalloc(size, sizeof(*rq->xsk_buffs), GFP_KERNEL);
5800         if (!rq->xsk_buffs)
5801                 return -ENOMEM;
5802
5803         hdr_dma = virtqueue_dma_map_single_attrs(sq->vq, &xsk_hdr, vi->hdr_len,
5804                                                  DMA_TO_DEVICE, 0);
5805         if (virtqueue_dma_mapping_error(sq->vq, hdr_dma))
5806                 return -ENOMEM;
5807
5808         err = xsk_pool_dma_map(pool, dma_dev, 0);
5809         if (err)
5810                 goto err_xsk_map;
5811
5812         err = virtnet_rq_bind_xsk_pool(vi, rq, pool);
5813         if (err)
5814                 goto err_rq;
5815
5816         err = virtnet_sq_bind_xsk_pool(vi, sq, pool);
5817         if (err)
5818                 goto err_sq;
5819
5820         /* Now, we do not support tx offload(such as tx csum), so all the tx
5821          * virtnet hdr is zero. So all the tx packets can share a single hdr.
5822          */
5823         sq->xsk_hdr_dma_addr = hdr_dma;
5824
5825         return 0;
5826
5827 err_sq:
5828         virtnet_rq_bind_xsk_pool(vi, rq, NULL);
5829 err_rq:
5830         xsk_pool_dma_unmap(pool, 0);
5831 err_xsk_map:
5832         virtqueue_dma_unmap_single_attrs(rq->vq, hdr_dma, vi->hdr_len,
5833                                          DMA_TO_DEVICE, 0);
5834         return err;
5835 }
5836
5837 static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
5838 {
5839         struct virtnet_info *vi = netdev_priv(dev);
5840         struct xsk_buff_pool *pool;
5841         struct receive_queue *rq;
5842         struct send_queue *sq;
5843         int err;
5844
5845         if (qid >= vi->curr_queue_pairs)
5846                 return -EINVAL;
5847
5848         sq = &vi->sq[qid];
5849         rq = &vi->rq[qid];
5850
5851         pool = rq->xsk_pool;
5852
5853         err = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
5854         err |= virtnet_sq_bind_xsk_pool(vi, sq, NULL);
5855
5856         xsk_pool_dma_unmap(pool, 0);
5857
5858         virtqueue_dma_unmap_single_attrs(sq->vq, sq->xsk_hdr_dma_addr,
5859                                          vi->hdr_len, DMA_TO_DEVICE, 0);
5860         kvfree(rq->xsk_buffs);
5861
5862         return err;
5863 }
5864
5865 static int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp)
5866 {
5867         if (xdp->xsk.pool)
5868                 return virtnet_xsk_pool_enable(dev, xdp->xsk.pool,
5869                                                xdp->xsk.queue_id);
5870         else
5871                 return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id);
5872 }
5873
5874 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5875                            struct netlink_ext_ack *extack)
5876 {
5877         unsigned int room = SKB_DATA_ALIGN(XDP_PACKET_HEADROOM +
5878                                            sizeof(struct skb_shared_info));
5879         unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN;
5880         struct virtnet_info *vi = netdev_priv(dev);
5881         struct bpf_prog *old_prog;
5882         u16 xdp_qp = 0, curr_qp;
5883         int i, err;
5884
5885         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
5886             && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
5887                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
5888                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
5889                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
5890                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) ||
5891                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) ||
5892                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) {
5893                 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
5894                 return -EOPNOTSUPP;
5895         }
5896
5897         if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
5898                 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
5899                 return -EINVAL;
5900         }
5901
5902         if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) {
5903                 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags");
5904                 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz);
5905                 return -EINVAL;
5906         }
5907
5908         curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
5909         if (prog)
5910                 xdp_qp = nr_cpu_ids;
5911
5912         /* XDP requires extra queues for XDP_TX */
5913         if (curr_qp + xdp_qp > vi->max_queue_pairs) {
5914                 netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
5915                                  curr_qp + xdp_qp, vi->max_queue_pairs);
5916                 xdp_qp = 0;
5917         }
5918
5919         old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
5920         if (!prog && !old_prog)
5921                 return 0;
5922
5923         if (prog)
5924                 bpf_prog_add(prog, vi->max_queue_pairs - 1);
5925
5926         /* Make sure NAPI is not using any XDP TX queues for RX. */
5927         if (netif_running(dev)) {
5928                 for (i = 0; i < vi->max_queue_pairs; i++) {
5929                         napi_disable(&vi->rq[i].napi);
5930                         virtnet_napi_tx_disable(&vi->sq[i].napi);
5931                 }
5932         }
5933
5934         if (!prog) {
5935                 for (i = 0; i < vi->max_queue_pairs; i++) {
5936                         rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
5937                         if (i == 0)
5938                                 virtnet_restore_guest_offloads(vi);
5939                 }
5940                 synchronize_net();
5941         }
5942
5943         err = virtnet_set_queues(vi, curr_qp + xdp_qp);
5944         if (err)
5945                 goto err;
5946         netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
5947         vi->xdp_queue_pairs = xdp_qp;
5948
5949         if (prog) {
5950                 vi->xdp_enabled = true;
5951                 for (i = 0; i < vi->max_queue_pairs; i++) {
5952                         rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
5953                         if (i == 0 && !old_prog)
5954                                 virtnet_clear_guest_offloads(vi);
5955                 }
5956                 if (!old_prog)
5957                         xdp_features_set_redirect_target(dev, true);
5958         } else {
5959                 xdp_features_clear_redirect_target(dev);
5960                 vi->xdp_enabled = false;
5961         }
5962
5963         for (i = 0; i < vi->max_queue_pairs; i++) {
5964                 if (old_prog)
5965                         bpf_prog_put(old_prog);
5966                 if (netif_running(dev)) {
5967                         virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
5968                         virtnet_napi_tx_enable(vi, vi->sq[i].vq,
5969                                                &vi->sq[i].napi);
5970                 }
5971         }
5972
5973         return 0;
5974
5975 err:
5976         if (!prog) {
5977                 virtnet_clear_guest_offloads(vi);
5978                 for (i = 0; i < vi->max_queue_pairs; i++)
5979                         rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
5980         }
5981
5982         if (netif_running(dev)) {
5983                 for (i = 0; i < vi->max_queue_pairs; i++) {
5984                         virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
5985                         virtnet_napi_tx_enable(vi, vi->sq[i].vq,
5986                                                &vi->sq[i].napi);
5987                 }
5988         }
5989         if (prog)
5990                 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
5991         return err;
5992 }
5993
5994 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5995 {
5996         switch (xdp->command) {
5997         case XDP_SETUP_PROG:
5998                 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
5999         case XDP_SETUP_XSK_POOL:
6000                 return virtnet_xsk_pool_setup(dev, xdp);
6001         default:
6002                 return -EINVAL;
6003         }
6004 }
6005
6006 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
6007                                       size_t len)
6008 {
6009         struct virtnet_info *vi = netdev_priv(dev);
6010         int ret;
6011
6012         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
6013                 return -EOPNOTSUPP;
6014
6015         ret = snprintf(buf, len, "sby");
6016         if (ret >= len)
6017                 return -EOPNOTSUPP;
6018
6019         return 0;
6020 }
6021
6022 static int virtnet_set_features(struct net_device *dev,
6023                                 netdev_features_t features)
6024 {
6025         struct virtnet_info *vi = netdev_priv(dev);
6026         u64 offloads;
6027         int err;
6028
6029         if ((dev->features ^ features) & NETIF_F_GRO_HW) {
6030                 if (vi->xdp_enabled)
6031                         return -EBUSY;
6032
6033                 if (features & NETIF_F_GRO_HW)
6034                         offloads = vi->guest_offloads_capable;
6035                 else
6036                         offloads = vi->guest_offloads_capable &
6037                                    ~GUEST_OFFLOAD_GRO_HW_MASK;
6038
6039                 err = virtnet_set_guest_offloads(vi, offloads);
6040                 if (err)
6041                         return err;
6042                 vi->guest_offloads = offloads;
6043         }
6044
6045         if ((dev->features ^ features) & NETIF_F_RXHASH) {
6046                 if (features & NETIF_F_RXHASH)
6047                         vi->rss.hash_types = vi->rss_hash_types_saved;
6048                 else
6049                         vi->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE;
6050
6051                 if (!virtnet_commit_rss_command(vi))
6052                         return -EINVAL;
6053         }
6054
6055         return 0;
6056 }
6057
6058 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue)
6059 {
6060         struct virtnet_info *priv = netdev_priv(dev);
6061         struct send_queue *sq = &priv->sq[txqueue];
6062         struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue);
6063
6064         u64_stats_update_begin(&sq->stats.syncp);
6065         u64_stats_inc(&sq->stats.tx_timeouts);
6066         u64_stats_update_end(&sq->stats.syncp);
6067
6068         netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n",
6069                    txqueue, sq->name, sq->vq->index, sq->vq->name,
6070                    jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start)));
6071 }
6072
6073 static int virtnet_init_irq_moder(struct virtnet_info *vi)
6074 {
6075         u8 profile_flags = 0, coal_flags = 0;
6076         int ret, i;
6077
6078         profile_flags |= DIM_PROFILE_RX;
6079         coal_flags |= DIM_COALESCE_USEC | DIM_COALESCE_PKTS;
6080         ret = net_dim_init_irq_moder(vi->dev, profile_flags, coal_flags,
6081                                      DIM_CQ_PERIOD_MODE_START_FROM_EQE,
6082                                      0, virtnet_rx_dim_work, NULL);
6083
6084         if (ret)
6085                 return ret;
6086
6087         for (i = 0; i < vi->max_queue_pairs; i++)
6088                 net_dim_setting(vi->dev, &vi->rq[i].dim, false);
6089
6090         return 0;
6091 }
6092
6093 static void virtnet_free_irq_moder(struct virtnet_info *vi)
6094 {
6095         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
6096                 return;
6097
6098         rtnl_lock();
6099         net_dim_free_irq_moder(vi->dev);
6100         rtnl_unlock();
6101 }
6102
6103 static const struct net_device_ops virtnet_netdev = {
6104         .ndo_open            = virtnet_open,
6105         .ndo_stop            = virtnet_close,
6106         .ndo_start_xmit      = start_xmit,
6107         .ndo_validate_addr   = eth_validate_addr,
6108         .ndo_set_mac_address = virtnet_set_mac_address,
6109         .ndo_set_rx_mode     = virtnet_set_rx_mode,
6110         .ndo_get_stats64     = virtnet_stats,
6111         .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
6112         .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
6113         .ndo_bpf                = virtnet_xdp,
6114         .ndo_xdp_xmit           = virtnet_xdp_xmit,
6115         .ndo_xsk_wakeup         = virtnet_xsk_wakeup,
6116         .ndo_features_check     = passthru_features_check,
6117         .ndo_get_phys_port_name = virtnet_get_phys_port_name,
6118         .ndo_set_features       = virtnet_set_features,
6119         .ndo_tx_timeout         = virtnet_tx_timeout,
6120 };
6121
6122 static void virtnet_config_changed_work(struct work_struct *work)
6123 {
6124         struct virtnet_info *vi =
6125                 container_of(work, struct virtnet_info, config_work);
6126         u16 v;
6127
6128         if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
6129                                  struct virtio_net_config, status, &v) < 0)
6130                 return;
6131
6132         if (v & VIRTIO_NET_S_ANNOUNCE) {
6133                 netdev_notify_peers(vi->dev);
6134                 virtnet_ack_link_announce(vi);
6135         }
6136
6137         /* Ignore unknown (future) status bits */
6138         v &= VIRTIO_NET_S_LINK_UP;
6139
6140         if (vi->status == v)
6141                 return;
6142
6143         vi->status = v;
6144
6145         if (vi->status & VIRTIO_NET_S_LINK_UP) {
6146                 virtnet_update_settings(vi);
6147                 netif_carrier_on(vi->dev);
6148                 netif_tx_wake_all_queues(vi->dev);
6149         } else {
6150                 netif_carrier_off(vi->dev);
6151                 netif_tx_stop_all_queues(vi->dev);
6152         }
6153 }
6154
6155 static void virtnet_config_changed(struct virtio_device *vdev)
6156 {
6157         struct virtnet_info *vi = vdev->priv;
6158
6159         schedule_work(&vi->config_work);
6160 }
6161
6162 static void virtnet_free_queues(struct virtnet_info *vi)
6163 {
6164         int i;
6165
6166         for (i = 0; i < vi->max_queue_pairs; i++) {
6167                 __netif_napi_del(&vi->rq[i].napi);
6168                 __netif_napi_del(&vi->sq[i].napi);
6169         }
6170
6171         /* We called __netif_napi_del(),
6172          * we need to respect an RCU grace period before freeing vi->rq
6173          */
6174         synchronize_net();
6175
6176         kfree(vi->rq);
6177         kfree(vi->sq);
6178         kfree(vi->ctrl);
6179 }
6180
6181 static void _free_receive_bufs(struct virtnet_info *vi)
6182 {
6183         struct bpf_prog *old_prog;
6184         int i;
6185
6186         for (i = 0; i < vi->max_queue_pairs; i++) {
6187                 while (vi->rq[i].pages)
6188                         __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
6189
6190                 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
6191                 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
6192                 if (old_prog)
6193                         bpf_prog_put(old_prog);
6194         }
6195 }
6196
6197 static void free_receive_bufs(struct virtnet_info *vi)
6198 {
6199         rtnl_lock();
6200         _free_receive_bufs(vi);
6201         rtnl_unlock();
6202 }
6203
6204 static void free_receive_page_frags(struct virtnet_info *vi)
6205 {
6206         int i;
6207         for (i = 0; i < vi->max_queue_pairs; i++)
6208                 if (vi->rq[i].alloc_frag.page) {
6209                         if (vi->rq[i].last_dma)
6210                                 virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0);
6211                         put_page(vi->rq[i].alloc_frag.page);
6212                 }
6213 }
6214
6215 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
6216 {
6217         struct virtnet_info *vi = vq->vdev->priv;
6218         struct send_queue *sq;
6219         int i = vq2txq(vq);
6220
6221         sq = &vi->sq[i];
6222
6223         switch (virtnet_xmit_ptr_unpack(&buf)) {
6224         case VIRTNET_XMIT_TYPE_SKB:
6225         case VIRTNET_XMIT_TYPE_SKB_ORPHAN:
6226                 dev_kfree_skb(buf);
6227                 break;
6228
6229         case VIRTNET_XMIT_TYPE_XDP:
6230                 xdp_return_frame(buf);
6231                 break;
6232
6233         case VIRTNET_XMIT_TYPE_XSK:
6234                 xsk_tx_completed(sq->xsk_pool, 1);
6235                 break;
6236         }
6237 }
6238
6239 static void virtnet_sq_free_unused_buf_done(struct virtqueue *vq)
6240 {
6241         struct virtnet_info *vi = vq->vdev->priv;
6242         int i = vq2txq(vq);
6243
6244         netdev_tx_reset_queue(netdev_get_tx_queue(vi->dev, i));
6245 }
6246
6247 static void free_unused_bufs(struct virtnet_info *vi)
6248 {
6249         void *buf;
6250         int i;
6251
6252         for (i = 0; i < vi->max_queue_pairs; i++) {
6253                 struct virtqueue *vq = vi->sq[i].vq;
6254                 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
6255                         virtnet_sq_free_unused_buf(vq, buf);
6256                 cond_resched();
6257         }
6258
6259         for (i = 0; i < vi->max_queue_pairs; i++) {
6260                 struct virtqueue *vq = vi->rq[i].vq;
6261
6262                 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
6263                         virtnet_rq_unmap_free_buf(vq, buf);
6264                 cond_resched();
6265         }
6266 }
6267
6268 static void virtnet_del_vqs(struct virtnet_info *vi)
6269 {
6270         struct virtio_device *vdev = vi->vdev;
6271
6272         virtnet_clean_affinity(vi);
6273
6274         vdev->config->del_vqs(vdev);
6275
6276         virtnet_free_queues(vi);
6277 }
6278
6279 /* How large should a single buffer be so a queue full of these can fit at
6280  * least one full packet?
6281  * Logic below assumes the mergeable buffer header is used.
6282  */
6283 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
6284 {
6285         const unsigned int hdr_len = vi->hdr_len;
6286         unsigned int rq_size = virtqueue_get_vring_size(vq);
6287         unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
6288         unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
6289         unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
6290
6291         return max(max(min_buf_len, hdr_len) - hdr_len,
6292                    (unsigned int)GOOD_PACKET_LEN);
6293 }
6294
6295 static int virtnet_find_vqs(struct virtnet_info *vi)
6296 {
6297         struct virtqueue_info *vqs_info;
6298         struct virtqueue **vqs;
6299         int ret = -ENOMEM;
6300         int total_vqs;
6301         bool *ctx;
6302         u16 i;
6303
6304         /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
6305          * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
6306          * possible control vq.
6307          */
6308         total_vqs = vi->max_queue_pairs * 2 +
6309                     virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
6310
6311         /* Allocate space for find_vqs parameters */
6312         vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
6313         if (!vqs)
6314                 goto err_vq;
6315         vqs_info = kcalloc(total_vqs, sizeof(*vqs_info), GFP_KERNEL);
6316         if (!vqs_info)
6317                 goto err_vqs_info;
6318         if (!vi->big_packets || vi->mergeable_rx_bufs) {
6319                 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
6320                 if (!ctx)
6321                         goto err_ctx;
6322         } else {
6323                 ctx = NULL;
6324         }
6325
6326         /* Parameters for control virtqueue, if any */
6327         if (vi->has_cvq) {
6328                 vqs_info[total_vqs - 1].name = "control";
6329         }
6330
6331         /* Allocate/initialize parameters for send/receive virtqueues */
6332         for (i = 0; i < vi->max_queue_pairs; i++) {
6333                 vqs_info[rxq2vq(i)].callback = skb_recv_done;
6334                 vqs_info[txq2vq(i)].callback = skb_xmit_done;
6335                 sprintf(vi->rq[i].name, "input.%u", i);
6336                 sprintf(vi->sq[i].name, "output.%u", i);
6337                 vqs_info[rxq2vq(i)].name = vi->rq[i].name;
6338                 vqs_info[txq2vq(i)].name = vi->sq[i].name;
6339                 if (ctx)
6340                         vqs_info[rxq2vq(i)].ctx = true;
6341         }
6342
6343         ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, vqs_info, NULL);
6344         if (ret)
6345                 goto err_find;
6346
6347         if (vi->has_cvq) {
6348                 vi->cvq = vqs[total_vqs - 1];
6349                 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
6350                         vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
6351         }
6352
6353         for (i = 0; i < vi->max_queue_pairs; i++) {
6354                 vi->rq[i].vq = vqs[rxq2vq(i)];
6355                 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
6356                 vi->sq[i].vq = vqs[txq2vq(i)];
6357         }
6358
6359         /* run here: ret == 0. */
6360
6361
6362 err_find:
6363         kfree(ctx);
6364 err_ctx:
6365         kfree(vqs_info);
6366 err_vqs_info:
6367         kfree(vqs);
6368 err_vq:
6369         return ret;
6370 }
6371
6372 static int virtnet_alloc_queues(struct virtnet_info *vi)
6373 {
6374         int i;
6375
6376         if (vi->has_cvq) {
6377                 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
6378                 if (!vi->ctrl)
6379                         goto err_ctrl;
6380         } else {
6381                 vi->ctrl = NULL;
6382         }
6383         vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
6384         if (!vi->sq)
6385                 goto err_sq;
6386         vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
6387         if (!vi->rq)
6388                 goto err_rq;
6389
6390         INIT_DELAYED_WORK(&vi->refill, refill_work);
6391         for (i = 0; i < vi->max_queue_pairs; i++) {
6392                 vi->rq[i].pages = NULL;
6393                 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll,
6394                                       napi_weight);
6395                 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi,
6396                                          virtnet_poll_tx,
6397                                          napi_tx ? napi_weight : 0);
6398
6399                 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
6400                 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
6401                 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
6402
6403                 u64_stats_init(&vi->rq[i].stats.syncp);
6404                 u64_stats_init(&vi->sq[i].stats.syncp);
6405                 mutex_init(&vi->rq[i].dim_lock);
6406         }
6407
6408         return 0;
6409
6410 err_rq:
6411         kfree(vi->sq);
6412 err_sq:
6413         kfree(vi->ctrl);
6414 err_ctrl:
6415         return -ENOMEM;
6416 }
6417
6418 static int init_vqs(struct virtnet_info *vi)
6419 {
6420         int ret;
6421
6422         /* Allocate send & receive queues */
6423         ret = virtnet_alloc_queues(vi);
6424         if (ret)
6425                 goto err;
6426
6427         ret = virtnet_find_vqs(vi);
6428         if (ret)
6429                 goto err_free;
6430
6431         cpus_read_lock();
6432         virtnet_set_affinity(vi);
6433         cpus_read_unlock();
6434
6435         return 0;
6436
6437 err_free:
6438         virtnet_free_queues(vi);
6439 err:
6440         return ret;
6441 }
6442
6443 #ifdef CONFIG_SYSFS
6444 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
6445                 char *buf)
6446 {
6447         struct virtnet_info *vi = netdev_priv(queue->dev);
6448         unsigned int queue_index = get_netdev_rx_queue_index(queue);
6449         unsigned int headroom = virtnet_get_headroom(vi);
6450         unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
6451         struct ewma_pkt_len *avg;
6452
6453         BUG_ON(queue_index >= vi->max_queue_pairs);
6454         avg = &vi->rq[queue_index].mrg_avg_pkt_len;
6455         return sprintf(buf, "%u\n",
6456                        get_mergeable_buf_len(&vi->rq[queue_index], avg,
6457                                        SKB_DATA_ALIGN(headroom + tailroom)));
6458 }
6459
6460 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
6461         __ATTR_RO(mergeable_rx_buffer_size);
6462
6463 static struct attribute *virtio_net_mrg_rx_attrs[] = {
6464         &mergeable_rx_buffer_size_attribute.attr,
6465         NULL
6466 };
6467
6468 static const struct attribute_group virtio_net_mrg_rx_group = {
6469         .name = "virtio_net",
6470         .attrs = virtio_net_mrg_rx_attrs
6471 };
6472 #endif
6473
6474 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
6475                                     unsigned int fbit,
6476                                     const char *fname, const char *dname)
6477 {
6478         if (!virtio_has_feature(vdev, fbit))
6479                 return false;
6480
6481         dev_err(&vdev->dev, "device advertises feature %s but not %s",
6482                 fname, dname);
6483
6484         return true;
6485 }
6486
6487 #define VIRTNET_FAIL_ON(vdev, fbit, dbit)                       \
6488         virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
6489
6490 static bool virtnet_validate_features(struct virtio_device *vdev)
6491 {
6492         if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
6493             (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
6494                              "VIRTIO_NET_F_CTRL_VQ") ||
6495              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
6496                              "VIRTIO_NET_F_CTRL_VQ") ||
6497              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
6498                              "VIRTIO_NET_F_CTRL_VQ") ||
6499              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
6500              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
6501                              "VIRTIO_NET_F_CTRL_VQ") ||
6502              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS,
6503                              "VIRTIO_NET_F_CTRL_VQ") ||
6504              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
6505                              "VIRTIO_NET_F_CTRL_VQ") ||
6506              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL,
6507                              "VIRTIO_NET_F_CTRL_VQ") ||
6508              VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_VQ_NOTF_COAL,
6509                              "VIRTIO_NET_F_CTRL_VQ"))) {
6510                 return false;
6511         }
6512
6513         return true;
6514 }
6515
6516 #define MIN_MTU ETH_MIN_MTU
6517 #define MAX_MTU ETH_MAX_MTU
6518
6519 static int virtnet_validate(struct virtio_device *vdev)
6520 {
6521         if (!vdev->config->get) {
6522                 dev_err(&vdev->dev, "%s failure: config access disabled\n",
6523                         __func__);
6524                 return -EINVAL;
6525         }
6526
6527         if (!virtnet_validate_features(vdev))
6528                 return -EINVAL;
6529
6530         if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
6531                 int mtu = virtio_cread16(vdev,
6532                                          offsetof(struct virtio_net_config,
6533                                                   mtu));
6534                 if (mtu < MIN_MTU)
6535                         __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
6536         }
6537
6538         if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) &&
6539             !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
6540                 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby");
6541                 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY);
6542         }
6543
6544         return 0;
6545 }
6546
6547 static bool virtnet_check_guest_gso(const struct virtnet_info *vi)
6548 {
6549         return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
6550                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
6551                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
6552                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
6553                 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) &&
6554                 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6));
6555 }
6556
6557 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu)
6558 {
6559         bool guest_gso = virtnet_check_guest_gso(vi);
6560
6561         /* If device can receive ANY guest GSO packets, regardless of mtu,
6562          * allocate packets of maximum size, otherwise limit it to only
6563          * mtu size worth only.
6564          */
6565         if (mtu > ETH_DATA_LEN || guest_gso) {
6566                 vi->big_packets = true;
6567                 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE);
6568         }
6569 }
6570
6571 #define VIRTIO_NET_HASH_REPORT_MAX_TABLE      10
6572 static enum xdp_rss_hash_type
6573 virtnet_xdp_rss_type[VIRTIO_NET_HASH_REPORT_MAX_TABLE] = {
6574         [VIRTIO_NET_HASH_REPORT_NONE] = XDP_RSS_TYPE_NONE,
6575         [VIRTIO_NET_HASH_REPORT_IPv4] = XDP_RSS_TYPE_L3_IPV4,
6576         [VIRTIO_NET_HASH_REPORT_TCPv4] = XDP_RSS_TYPE_L4_IPV4_TCP,
6577         [VIRTIO_NET_HASH_REPORT_UDPv4] = XDP_RSS_TYPE_L4_IPV4_UDP,
6578         [VIRTIO_NET_HASH_REPORT_IPv6] = XDP_RSS_TYPE_L3_IPV6,
6579         [VIRTIO_NET_HASH_REPORT_TCPv6] = XDP_RSS_TYPE_L4_IPV6_TCP,
6580         [VIRTIO_NET_HASH_REPORT_UDPv6] = XDP_RSS_TYPE_L4_IPV6_UDP,
6581         [VIRTIO_NET_HASH_REPORT_IPv6_EX] = XDP_RSS_TYPE_L3_IPV6_EX,
6582         [VIRTIO_NET_HASH_REPORT_TCPv6_EX] = XDP_RSS_TYPE_L4_IPV6_TCP_EX,
6583         [VIRTIO_NET_HASH_REPORT_UDPv6_EX] = XDP_RSS_TYPE_L4_IPV6_UDP_EX
6584 };
6585
6586 static int virtnet_xdp_rx_hash(const struct xdp_md *_ctx, u32 *hash,
6587                                enum xdp_rss_hash_type *rss_type)
6588 {
6589         const struct xdp_buff *xdp = (void *)_ctx;
6590         struct virtio_net_hdr_v1_hash *hdr_hash;
6591         struct virtnet_info *vi;
6592         u16 hash_report;
6593
6594         if (!(xdp->rxq->dev->features & NETIF_F_RXHASH))
6595                 return -ENODATA;
6596
6597         vi = netdev_priv(xdp->rxq->dev);
6598         hdr_hash = (struct virtio_net_hdr_v1_hash *)(xdp->data - vi->hdr_len);
6599         hash_report = __le16_to_cpu(hdr_hash->hash_report);
6600
6601         if (hash_report >= VIRTIO_NET_HASH_REPORT_MAX_TABLE)
6602                 hash_report = VIRTIO_NET_HASH_REPORT_NONE;
6603
6604         *rss_type = virtnet_xdp_rss_type[hash_report];
6605         *hash = __le32_to_cpu(hdr_hash->hash_value);
6606         return 0;
6607 }
6608
6609 static const struct xdp_metadata_ops virtnet_xdp_metadata_ops = {
6610         .xmo_rx_hash                    = virtnet_xdp_rx_hash,
6611 };
6612
6613 static int virtnet_probe(struct virtio_device *vdev)
6614 {
6615         int i, err = -ENOMEM;
6616         struct net_device *dev;
6617         struct virtnet_info *vi;
6618         u16 max_queue_pairs;
6619         int mtu = 0;
6620
6621         /* Find if host supports multiqueue/rss virtio_net device */
6622         max_queue_pairs = 1;
6623         if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
6624                 max_queue_pairs =
6625                      virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs));
6626
6627         /* We need at least 2 queue's */
6628         if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
6629             max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
6630             !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
6631                 max_queue_pairs = 1;
6632
6633         /* Allocate ourselves a network device with room for our info */
6634         dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
6635         if (!dev)
6636                 return -ENOMEM;
6637
6638         /* Set up network device as normal. */
6639         dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
6640                            IFF_TX_SKB_NO_LINEAR;
6641         dev->netdev_ops = &virtnet_netdev;
6642         dev->stat_ops = &virtnet_stat_ops;
6643         dev->features = NETIF_F_HIGHDMA;
6644
6645         dev->ethtool_ops = &virtnet_ethtool_ops;
6646         SET_NETDEV_DEV(dev, &vdev->dev);
6647
6648         /* Do we support "hardware" checksums? */
6649         if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
6650                 /* This opens up the world of extra features. */
6651                 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
6652                 if (csum)
6653                         dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
6654
6655                 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
6656                         dev->hw_features |= NETIF_F_TSO
6657                                 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
6658                 }
6659                 /* Individual feature bits: what can host handle? */
6660                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
6661                         dev->hw_features |= NETIF_F_TSO;
6662                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
6663                         dev->hw_features |= NETIF_F_TSO6;
6664                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
6665                         dev->hw_features |= NETIF_F_TSO_ECN;
6666                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO))
6667                         dev->hw_features |= NETIF_F_GSO_UDP_L4;
6668
6669                 dev->features |= NETIF_F_GSO_ROBUST;
6670
6671                 if (gso)
6672                         dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
6673                 /* (!csum && gso) case will be fixed by register_netdev() */
6674         }
6675
6676         /* 1. With VIRTIO_NET_F_GUEST_CSUM negotiation, the driver doesn't
6677          * need to calculate checksums for partially checksummed packets,
6678          * as they're considered valid by the upper layer.
6679          * 2. Without VIRTIO_NET_F_GUEST_CSUM negotiation, the driver only
6680          * receives fully checksummed packets. The device may assist in
6681          * validating these packets' checksums, so the driver won't have to.
6682          */
6683         dev->features |= NETIF_F_RXCSUM;
6684
6685         if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
6686             virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
6687                 dev->features |= NETIF_F_GRO_HW;
6688         if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
6689                 dev->hw_features |= NETIF_F_GRO_HW;
6690
6691         dev->vlan_features = dev->features;
6692         dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
6693                 NETDEV_XDP_ACT_XSK_ZEROCOPY;
6694
6695         /* MTU range: 68 - 65535 */
6696         dev->min_mtu = MIN_MTU;
6697         dev->max_mtu = MAX_MTU;
6698
6699         /* Configuration may specify what MAC to use.  Otherwise random. */
6700         if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
6701                 u8 addr[ETH_ALEN];
6702
6703                 virtio_cread_bytes(vdev,
6704                                    offsetof(struct virtio_net_config, mac),
6705                                    addr, ETH_ALEN);
6706                 eth_hw_addr_set(dev, addr);
6707         } else {
6708                 eth_hw_addr_random(dev);
6709                 dev_info(&vdev->dev, "Assigned random MAC address %pM\n",
6710                          dev->dev_addr);
6711         }
6712
6713         /* Set up our device-specific information */
6714         vi = netdev_priv(dev);
6715         vi->dev = dev;
6716         vi->vdev = vdev;
6717         vdev->priv = vi;
6718
6719         INIT_WORK(&vi->config_work, virtnet_config_changed_work);
6720         INIT_WORK(&vi->rx_mode_work, virtnet_rx_mode_work);
6721         spin_lock_init(&vi->refill_lock);
6722
6723         if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) {
6724                 vi->mergeable_rx_bufs = true;
6725                 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG;
6726         }
6727
6728         if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
6729                 vi->has_rss_hash_report = true;
6730
6731         if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
6732                 vi->has_rss = true;
6733
6734                 vi->rss_indir_table_size =
6735                         virtio_cread16(vdev, offsetof(struct virtio_net_config,
6736                                 rss_max_indirection_table_length));
6737         }
6738         err = rss_indirection_table_alloc(&vi->rss, vi->rss_indir_table_size);
6739         if (err)
6740                 goto free;
6741
6742         if (vi->has_rss || vi->has_rss_hash_report) {
6743                 vi->rss_key_size =
6744                         virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
6745                 if (vi->rss_key_size > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
6746                         dev_err(&vdev->dev, "rss_max_key_size=%u exceeds the limit %u.\n",
6747                                 vi->rss_key_size, VIRTIO_NET_RSS_MAX_KEY_SIZE);
6748                         err = -EINVAL;
6749                         goto free;
6750                 }
6751
6752                 vi->rss_hash_types_supported =
6753                     virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
6754                 vi->rss_hash_types_supported &=
6755                                 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
6756                                   VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
6757                                   VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
6758
6759                 dev->hw_features |= NETIF_F_RXHASH;
6760                 dev->xdp_metadata_ops = &virtnet_xdp_metadata_ops;
6761         }
6762
6763         if (vi->has_rss_hash_report)
6764                 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
6765         else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
6766                  virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
6767                 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
6768         else
6769                 vi->hdr_len = sizeof(struct virtio_net_hdr);
6770
6771         if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
6772             virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
6773                 vi->any_header_sg = true;
6774
6775         if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
6776                 vi->has_cvq = true;
6777
6778         mutex_init(&vi->cvq_lock);
6779
6780         if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
6781                 mtu = virtio_cread16(vdev,
6782                                      offsetof(struct virtio_net_config,
6783                                               mtu));
6784                 if (mtu < dev->min_mtu) {
6785                         /* Should never trigger: MTU was previously validated
6786                          * in virtnet_validate.
6787                          */
6788                         dev_err(&vdev->dev,
6789                                 "device MTU appears to have changed it is now %d < %d",
6790                                 mtu, dev->min_mtu);
6791                         err = -EINVAL;
6792                         goto free;
6793                 }
6794
6795                 dev->mtu = mtu;
6796                 dev->max_mtu = mtu;
6797         }
6798
6799         virtnet_set_big_packets(vi, mtu);
6800
6801         if (vi->any_header_sg)
6802                 dev->needed_headroom = vi->hdr_len;
6803
6804         /* Enable multiqueue by default */
6805         if (num_online_cpus() >= max_queue_pairs)
6806                 vi->curr_queue_pairs = max_queue_pairs;
6807         else
6808                 vi->curr_queue_pairs = num_online_cpus();
6809         vi->max_queue_pairs = max_queue_pairs;
6810
6811         /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
6812         err = init_vqs(vi);
6813         if (err)
6814                 goto free;
6815
6816         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
6817                 vi->intr_coal_rx.max_usecs = 0;
6818                 vi->intr_coal_tx.max_usecs = 0;
6819                 vi->intr_coal_rx.max_packets = 0;
6820
6821                 /* Keep the default values of the coalescing parameters
6822                  * aligned with the default napi_tx state.
6823                  */
6824                 if (vi->sq[0].napi.weight)
6825                         vi->intr_coal_tx.max_packets = 1;
6826                 else
6827                         vi->intr_coal_tx.max_packets = 0;
6828         }
6829
6830         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
6831                 /* The reason is the same as VIRTIO_NET_F_NOTF_COAL. */
6832                 for (i = 0; i < vi->max_queue_pairs; i++)
6833                         if (vi->sq[i].napi.weight)
6834                                 vi->sq[i].intr_coal.max_packets = 1;
6835
6836                 err = virtnet_init_irq_moder(vi);
6837                 if (err)
6838                         goto free;
6839         }
6840
6841 #ifdef CONFIG_SYSFS
6842         if (vi->mergeable_rx_bufs)
6843                 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
6844 #endif
6845         netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
6846         netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
6847
6848         virtnet_init_settings(dev);
6849
6850         if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
6851                 vi->failover = net_failover_create(vi->dev);
6852                 if (IS_ERR(vi->failover)) {
6853                         err = PTR_ERR(vi->failover);
6854                         goto free_vqs;
6855                 }
6856         }
6857
6858         if (vi->has_rss || vi->has_rss_hash_report)
6859                 virtnet_init_default_rss(vi);
6860
6861         enable_rx_mode_work(vi);
6862
6863         /* serialize netdev register + virtio_device_ready() with ndo_open() */
6864         rtnl_lock();
6865
6866         err = register_netdevice(dev);
6867         if (err) {
6868                 pr_debug("virtio_net: registering device failed\n");
6869                 rtnl_unlock();
6870                 goto free_failover;
6871         }
6872
6873         /* Disable config change notification until ndo_open. */
6874         virtio_config_driver_disable(vi->vdev);
6875
6876         virtio_device_ready(vdev);
6877
6878         if (vi->has_rss || vi->has_rss_hash_report) {
6879                 if (!virtnet_commit_rss_command(vi)) {
6880                         dev_warn(&vdev->dev, "RSS disabled because committing failed.\n");
6881                         dev->hw_features &= ~NETIF_F_RXHASH;
6882                         vi->has_rss_hash_report = false;
6883                         vi->has_rss = false;
6884                 }
6885         }
6886
6887         virtnet_set_queues(vi, vi->curr_queue_pairs);
6888
6889         /* a random MAC address has been assigned, notify the device.
6890          * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
6891          * because many devices work fine without getting MAC explicitly
6892          */
6893         if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
6894             virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
6895                 struct scatterlist sg;
6896
6897                 sg_init_one(&sg, dev->dev_addr, dev->addr_len);
6898                 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
6899                                           VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
6900                         pr_debug("virtio_net: setting MAC address failed\n");
6901                         rtnl_unlock();
6902                         err = -EINVAL;
6903                         goto free_unregister_netdev;
6904                 }
6905         }
6906
6907         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS)) {
6908                 struct virtio_net_stats_capabilities *stats_cap  __free(kfree) = NULL;
6909                 struct scatterlist sg;
6910                 __le64 v;
6911
6912                 stats_cap = kzalloc(sizeof(*stats_cap), GFP_KERNEL);
6913                 if (!stats_cap) {
6914                         rtnl_unlock();
6915                         err = -ENOMEM;
6916                         goto free_unregister_netdev;
6917                 }
6918
6919                 sg_init_one(&sg, stats_cap, sizeof(*stats_cap));
6920
6921                 if (!virtnet_send_command_reply(vi, VIRTIO_NET_CTRL_STATS,
6922                                                 VIRTIO_NET_CTRL_STATS_QUERY,
6923                                                 NULL, &sg)) {
6924                         pr_debug("virtio_net: fail to get stats capability\n");
6925                         rtnl_unlock();
6926                         err = -EINVAL;
6927                         goto free_unregister_netdev;
6928                 }
6929
6930                 v = stats_cap->supported_stats_types[0];
6931                 vi->device_stats_cap = le64_to_cpu(v);
6932         }
6933
6934         /* Assume link up if device can't report link status,
6935            otherwise get link status from config. */
6936         netif_carrier_off(dev);
6937         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
6938                 virtnet_config_changed_work(&vi->config_work);
6939         } else {
6940                 vi->status = VIRTIO_NET_S_LINK_UP;
6941                 virtnet_update_settings(vi);
6942                 netif_carrier_on(dev);
6943         }
6944
6945         for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
6946                 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
6947                         set_bit(guest_offloads[i], &vi->guest_offloads);
6948         vi->guest_offloads_capable = vi->guest_offloads;
6949
6950         rtnl_unlock();
6951
6952         err = virtnet_cpu_notif_add(vi);
6953         if (err) {
6954                 pr_debug("virtio_net: registering cpu notifier failed\n");
6955                 goto free_unregister_netdev;
6956         }
6957
6958         pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
6959                  dev->name, max_queue_pairs);
6960
6961         return 0;
6962
6963 free_unregister_netdev:
6964         unregister_netdev(dev);
6965 free_failover:
6966         net_failover_destroy(vi->failover);
6967 free_vqs:
6968         virtio_reset_device(vdev);
6969         cancel_delayed_work_sync(&vi->refill);
6970         free_receive_page_frags(vi);
6971         virtnet_del_vqs(vi);
6972 free:
6973         free_netdev(dev);
6974         return err;
6975 }
6976
6977 static void remove_vq_common(struct virtnet_info *vi)
6978 {
6979         int i;
6980
6981         virtio_reset_device(vi->vdev);
6982
6983         /* Free unused buffers in both send and recv, if any. */
6984         free_unused_bufs(vi);
6985
6986         /*
6987          * Rule of thumb is netdev_tx_reset_queue() should follow any
6988          * skb freeing not followed by netdev_tx_completed_queue()
6989          */
6990         for (i = 0; i < vi->max_queue_pairs; i++)
6991                 netdev_tx_reset_queue(netdev_get_tx_queue(vi->dev, i));
6992
6993         free_receive_bufs(vi);
6994
6995         free_receive_page_frags(vi);
6996
6997         virtnet_del_vqs(vi);
6998 }
6999
7000 static void virtnet_remove(struct virtio_device *vdev)
7001 {
7002         struct virtnet_info *vi = vdev->priv;
7003
7004         virtnet_cpu_notif_remove(vi);
7005
7006         /* Make sure no work handler is accessing the device. */
7007         flush_work(&vi->config_work);
7008         disable_rx_mode_work(vi);
7009         flush_work(&vi->rx_mode_work);
7010
7011         virtnet_free_irq_moder(vi);
7012
7013         unregister_netdev(vi->dev);
7014
7015         net_failover_destroy(vi->failover);
7016
7017         remove_vq_common(vi);
7018
7019         rss_indirection_table_free(&vi->rss);
7020
7021         free_netdev(vi->dev);
7022 }
7023
7024 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
7025 {
7026         struct virtnet_info *vi = vdev->priv;
7027
7028         virtnet_cpu_notif_remove(vi);
7029         virtnet_freeze_down(vdev);
7030         remove_vq_common(vi);
7031
7032         return 0;
7033 }
7034
7035 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
7036 {
7037         struct virtnet_info *vi = vdev->priv;
7038         int err;
7039
7040         err = virtnet_restore_up(vdev);
7041         if (err)
7042                 return err;
7043         virtnet_set_queues(vi, vi->curr_queue_pairs);
7044
7045         err = virtnet_cpu_notif_add(vi);
7046         if (err) {
7047                 virtnet_freeze_down(vdev);
7048                 remove_vq_common(vi);
7049                 return err;
7050         }
7051
7052         return 0;
7053 }
7054
7055 static struct virtio_device_id id_table[] = {
7056         { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
7057         { 0 },
7058 };
7059
7060 #define VIRTNET_FEATURES \
7061         VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
7062         VIRTIO_NET_F_MAC, \
7063         VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
7064         VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
7065         VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
7066         VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \
7067         VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
7068         VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
7069         VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
7070         VIRTIO_NET_F_CTRL_MAC_ADDR, \
7071         VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
7072         VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
7073         VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \
7074         VIRTIO_NET_F_VQ_NOTF_COAL, \
7075         VIRTIO_NET_F_GUEST_HDRLEN, VIRTIO_NET_F_DEVICE_STATS
7076
7077 static unsigned int features[] = {
7078         VIRTNET_FEATURES,
7079 };
7080
7081 static unsigned int features_legacy[] = {
7082         VIRTNET_FEATURES,
7083         VIRTIO_NET_F_GSO,
7084         VIRTIO_F_ANY_LAYOUT,
7085 };
7086
7087 static struct virtio_driver virtio_net_driver = {
7088         .feature_table = features,
7089         .feature_table_size = ARRAY_SIZE(features),
7090         .feature_table_legacy = features_legacy,
7091         .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
7092         .driver.name =  KBUILD_MODNAME,
7093         .id_table =     id_table,
7094         .validate =     virtnet_validate,
7095         .probe =        virtnet_probe,
7096         .remove =       virtnet_remove,
7097         .config_changed = virtnet_config_changed,
7098 #ifdef CONFIG_PM_SLEEP
7099         .freeze =       virtnet_freeze,
7100         .restore =      virtnet_restore,
7101 #endif
7102 };
7103
7104 static __init int virtio_net_driver_init(void)
7105 {
7106         int ret;
7107
7108         ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
7109                                       virtnet_cpu_online,
7110                                       virtnet_cpu_down_prep);
7111         if (ret < 0)
7112                 goto out;
7113         virtionet_online = ret;
7114         ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
7115                                       NULL, virtnet_cpu_dead);
7116         if (ret)
7117                 goto err_dead;
7118         ret = register_virtio_driver(&virtio_net_driver);
7119         if (ret)
7120                 goto err_virtio;
7121         return 0;
7122 err_virtio:
7123         cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
7124 err_dead:
7125         cpuhp_remove_multi_state(virtionet_online);
7126 out:
7127         return ret;
7128 }
7129 module_init(virtio_net_driver_init);
7130
7131 static __exit void virtio_net_driver_exit(void)
7132 {
7133         unregister_virtio_driver(&virtio_net_driver);
7134         cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
7135         cpuhp_remove_multi_state(virtionet_online);
7136 }
7137 module_exit(virtio_net_driver_exit);
7138
7139 MODULE_DEVICE_TABLE(virtio, id_table);
7140 MODULE_DESCRIPTION("Virtio network driver");
7141 MODULE_LICENSE("GPL");