drivers/staging/octeon/ethernet-tx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file is based on code from OCTEON SDK by Cavium Networks.
   4  *
   5  * Copyright (c) 2003-2010 Cavium Networks
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ip.h>
  13 #include <linux/ratelimit.h>
  14 #include <linux/string.h>
  15 #include <linux/interrupt.h>
  16 #include <net/dst.h>
  17 #ifdef CONFIG_XFRM
  18 #include <linux/xfrm.h>
  19 #include <net/xfrm.h>
  20 #endif /* CONFIG_XFRM */
  21
  22 #include <linux/atomic.h>
  23 #include <net/sch_generic.h>
  24
  25 #include "octeon-ethernet.h"
  26 #include "ethernet-defines.h"
  27 #include "ethernet-tx.h"
  28 #include "ethernet-util.h"
  29
  30 #define CVM_OCT_SKB_CB(skb)     ((u64 *)((skb)->cb))
  31
  32 /*
  33  * You can define GET_SKBUFF_QOS() to override how the skbuff output
  34  * function determines which output queue is used. The default
  35  * implementation always uses the base queue for the port. If, for
  36  * example, you wanted to use the skb->priority field, define
  37  * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
  38  */
  39 #ifndef GET_SKBUFF_QOS
  40 #define GET_SKBUFF_QOS(skb) 0
  41 #endif
  42
  43 static void cvm_oct_tx_do_cleanup(unsigned long arg);
  44 static DECLARE_TASKLET_OLD(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
  45
  46 /* Maximum number of SKBs to try to free per xmit packet. */
  47 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
  48
  49 static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
  50 {
  51         int undo;
  52
  53         undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
  54                                                    MAX_SKB_TO_FREE;
  55         if (undo > 0)
  56                 cvmx_fau_atomic_add32(fau, -undo);
  57         skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
  58                                                        -skb_to_free;
  59         return skb_to_free;
  60 }
  61
  62 static void cvm_oct_kick_tx_poll_watchdog(void)
  63 {
  64         union cvmx_ciu_timx ciu_timx;
  65
  66         ciu_timx.u64 = 0;
  67         ciu_timx.s.one_shot = 1;
  68         ciu_timx.s.len = cvm_oct_tx_poll_interval;
  69         cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
  70 }
  71
  72 static void cvm_oct_free_tx_skbs(struct net_device *dev)
  73 {
  74         int skb_to_free;
  75         int qos, queues_per_port;
  76         int total_remaining = 0;
  77         unsigned long flags;
  78         struct octeon_ethernet *priv = netdev_priv(dev);
  79
  80         queues_per_port = cvmx_pko_get_num_queues(priv->port);
  81         /* Drain any pending packets in the free list */
  82         for (qos = 0; qos < queues_per_port; qos++) {
  83                 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
  84                         continue;
  85                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
  86                                                        MAX_SKB_TO_FREE);
  87                 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
  88                                                          priv->fau + qos * 4);
  89                 if (skb_to_free > 0) {
  90                         struct sk_buff *to_free_list = NULL;
  91
  92                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
  93                         while (skb_to_free > 0) {
  94                                 struct sk_buff *t;
  95
  96                                 t = __skb_dequeue(&priv->tx_free_list[qos]);
  97                                 t->next = to_free_list;
  98                                 to_free_list = t;
  99                                 skb_to_free--;
 100                         }
 101                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 102                                                flags);
 103                         /* Do the actual freeing outside of the lock. */
 104                         while (to_free_list) {
 105                                 struct sk_buff *t = to_free_list;
 106
 107                                 to_free_list = to_free_list->next;
 108                                 dev_kfree_skb_any(t);
 109                         }
 110                 }
 111                 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
 112         }
 113         if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
 114                 netif_wake_queue(dev);
 115         if (total_remaining)
 116                 cvm_oct_kick_tx_poll_watchdog();
 117 }
 118
 119 /**
 120  * cvm_oct_xmit - transmit a packet
 121  * @skb:    Packet to send
 122  * @dev:    Device info structure
 123  *
 124  * Returns Always returns NETDEV_TX_OK
 125  */
 126 netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
 127 {
 128         union cvmx_pko_command_word0 pko_command;
 129         union cvmx_buf_ptr hw_buffer;
 130         u64 old_scratch;
 131         u64 old_scratch2;
 132         int qos;
 133         int i;
 134         enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
 135         struct octeon_ethernet *priv = netdev_priv(dev);
 136         struct sk_buff *to_free_list;
 137         int skb_to_free;
 138         int buffers_to_free;
 139         u32 total_to_clean;
 140         unsigned long flags;
 141 #if REUSE_SKBUFFS_WITHOUT_FREE
 142         unsigned char *fpa_head;
 143 #endif
 144
 145         /*
 146          * Prefetch the private data structure.  It is larger than the
 147          * one cache line.
 148          */
 149         prefetch(priv);
 150
 151         /*
 152          * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
 153          * completely remove "qos" in the event neither interface
 154          * supports multiple queues per port.
 155          */
 156         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 157             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 158                 qos = GET_SKBUFF_QOS(skb);
 159                 if (qos <= 0)
 160                         qos = 0;
 161                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 162                         qos = 0;
 163         } else {
 164                 qos = 0;
 165         }
 166
 167         if (USE_ASYNC_IOBDMA) {
 168                 /* Save scratch in case userspace is using it */
 169                 CVMX_SYNCIOBDMA;
 170                 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 171                 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 172
 173                 /*
 174                  * Fetch and increment the number of packets to be
 175                  * freed.
 176                  */
 177                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
 178                                                FAU_NUM_PACKET_BUFFERS_TO_FREE,
 179                                                0);
 180                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 181                                                priv->fau + qos * 4,
 182                                                MAX_SKB_TO_FREE);
 183         }
 184
 185         /*
 186          * We have space for 6 segment pointers, If there will be more
 187          * than that, we must linearize.
 188          */
 189         if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
 190                 if (unlikely(__skb_linearize(skb))) {
 191                         queue_type = QUEUE_DROP;
 192                         if (USE_ASYNC_IOBDMA) {
 193                                 /*
 194                                  * Get the number of skbuffs in use
 195                                  * by the hardware
 196                                  */
 197                                 CVMX_SYNCIOBDMA;
 198                                 skb_to_free =
 199                                         cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 200                         } else {
 201                                 /*
 202                                  * Get the number of skbuffs in use
 203                                  * by the hardware
 204                                  */
 205                                 skb_to_free =
 206                                      cvmx_fau_fetch_and_add32(priv->fau +
 207                                                               qos * 4,
 208                                                               MAX_SKB_TO_FREE);
 209                         }
 210                         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 211                                                                  priv->fau +
 212                                                                  qos * 4);
 213                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 214                         goto skip_xmit;
 215                 }
 216         }
 217
 218         /*
 219          * The CN3XXX series of parts has an errata (GMX-401) which
 220          * causes the GMX block to hang if a collision occurs towards
 221          * the end of a <68 byte packet. As a workaround for this, we
 222          * pad packets to be 68 bytes whenever we are in half duplex
 223          * mode. We don't handle the case of having a small packet but
 224          * no room to add the padding.  The kernel should always give
 225          * us at least a cache line
 226          */
 227         if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 228                 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
 229                 int interface = INTERFACE(priv->port);
 230                 int index = INDEX(priv->port);
 231
 232                 if (interface < 2) {
 233                         /* We only need to pad packet in half duplex mode */
 234                         gmx_prt_cfg.u64 =
 235                             cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 236                         if (gmx_prt_cfg.s.duplex == 0) {
 237                                 int add_bytes = 64 - skb->len;
 238
 239                                 if ((skb_tail_pointer(skb) + add_bytes) <=
 240                                     skb_end_pointer(skb))
 241                                         __skb_put_zero(skb, add_bytes);
 242                         }
 243                 }
 244         }
 245
 246         /* Build the PKO command */
 247         pko_command.u64 = 0;
 248 #ifdef __LITTLE_ENDIAN
 249         pko_command.s.le = 1;
 250 #endif
 251         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 252         pko_command.s.segs = 1;
 253         pko_command.s.total_bytes = skb->len;
 254         pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
 255         pko_command.s.subone0 = 1;
 256
 257         pko_command.s.dontfree = 1;
 258
 259         /* Build the PKO buffer pointer */
 260         hw_buffer.u64 = 0;
 261         if (skb_shinfo(skb)->nr_frags == 0) {
 262                 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
 263                 hw_buffer.s.pool = 0;
 264                 hw_buffer.s.size = skb->len;
 265         } else {
 266                 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
 267                 hw_buffer.s.pool = 0;
 268                 hw_buffer.s.size = skb_headlen(skb);
 269                 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
 270                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 271                         skb_frag_t *fs = skb_shinfo(skb)->frags + i;
 272
 273                         hw_buffer.s.addr =
 274                                 XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
 275                         hw_buffer.s.size = skb_frag_size(fs);
 276                         CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
 277                 }
 278                 hw_buffer.s.addr =
 279                         XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
 280                 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
 281                 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
 282                 pko_command.s.gather = 1;
 283                 goto dont_put_skbuff_in_hw;
 284         }
 285
 286         /*
 287          * See if we can put this skb in the FPA pool. Any strange
 288          * behavior from the Linux networking stack will most likely
 289          * be caused by a bug in the following code. If some field is
 290          * in use by the network stack and gets carried over when a
 291          * buffer is reused, bad things may happen.  If in doubt and
 292          * you dont need the absolute best performance, disable the
 293          * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
 294          * shown a 25% increase in performance under some loads.
 295          */
 296 #if REUSE_SKBUFFS_WITHOUT_FREE
 297         fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
 298         if (unlikely(skb->data < fpa_head)) {
 299                 /* TX buffer beginning can't meet FPA alignment constraints */
 300                 goto dont_put_skbuff_in_hw;
 301         }
 302         if (unlikely
 303             ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
 304                 /* TX buffer isn't large enough for the FPA */
 305                 goto dont_put_skbuff_in_hw;
 306         }
 307         if (unlikely(skb_shared(skb))) {
 308                 /* TX buffer sharing data with someone else */
 309                 goto dont_put_skbuff_in_hw;
 310         }
 311         if (unlikely(skb_cloned(skb))) {
 312                 /* TX buffer has been cloned */
 313                 goto dont_put_skbuff_in_hw;
 314         }
 315         if (unlikely(skb_header_cloned(skb))) {
 316                 /* TX buffer header has been cloned */
 317                 goto dont_put_skbuff_in_hw;
 318         }
 319         if (unlikely(skb->destructor)) {
 320                 /* TX buffer has a destructor */
 321                 goto dont_put_skbuff_in_hw;
 322         }
 323         if (unlikely(skb_shinfo(skb)->nr_frags)) {
 324                 /* TX buffer has fragments */
 325                 goto dont_put_skbuff_in_hw;
 326         }
 327         if (unlikely
 328             (skb->truesize !=
 329              sizeof(*skb) + skb_end_offset(skb))) {
 330                 /* TX buffer truesize has been changed */
 331                 goto dont_put_skbuff_in_hw;
 332         }
 333
 334         /*
 335          * We can use this buffer in the FPA.  We don't need the FAU
 336          * update anymore
 337          */
 338         pko_command.s.dontfree = 0;
 339
 340         hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
 341                            ((unsigned long)fpa_head >> 7);
 342
 343         *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
 344
 345         /*
 346          * The skbuff will be reused without ever being freed. We must
 347          * cleanup a bunch of core things.
 348          */
 349         dst_release(skb_dst(skb));
 350         skb_dst_set(skb, NULL);
 351         skb_ext_reset(skb);
 352         nf_reset_ct(skb);
 353         skb_reset_redirect(skb);
 354
 355 #ifdef CONFIG_NET_SCHED
 356         skb->tc_index = 0;
 357 #endif /* CONFIG_NET_SCHED */
 358 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
 359
 360 dont_put_skbuff_in_hw:
 361
 362         /* Check if we can use the hardware checksumming */
 363         if ((skb->protocol == htons(ETH_P_IP)) &&
 364             (ip_hdr(skb)->version == 4) &&
 365             (ip_hdr(skb)->ihl == 5) &&
 366             ((ip_hdr(skb)->frag_off == 0) ||
 367              (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
 368             ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 369              (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
 370                 /* Use hardware checksum calc */
 371                 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
 372         }
 373
 374         if (USE_ASYNC_IOBDMA) {
 375                 /* Get the number of skbuffs in use by the hardware */
 376                 CVMX_SYNCIOBDMA;
 377                 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 378                 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 379         } else {
 380                 /* Get the number of skbuffs in use by the hardware */
 381                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 382                                                        MAX_SKB_TO_FREE);
 383                 buffers_to_free =
 384                     cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
 385         }
 386
 387         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 388                                                  priv->fau + qos * 4);
 389
 390         /*
 391          * If we're sending faster than the receive can free them then
 392          * don't do the HW free.
 393          */
 394         if ((buffers_to_free < -100) && !pko_command.s.dontfree)
 395                 pko_command.s.dontfree = 1;
 396
 397         if (pko_command.s.dontfree) {
 398                 queue_type = QUEUE_CORE;
 399                 pko_command.s.reg0 = priv->fau + qos * 4;
 400         } else {
 401                 queue_type = QUEUE_HW;
 402         }
 403         if (USE_ASYNC_IOBDMA)
 404                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 405                                                FAU_TOTAL_TX_TO_CLEAN, 1);
 406
 407         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 408
 409         /* Drop this packet if we have too many already queued to the HW */
 410         if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
 411                      MAX_OUT_QUEUE_DEPTH)) {
 412                 if (dev->tx_queue_len != 0) {
 413                         /* Drop the lock when notifying the core.  */
 414                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 415                                                flags);
 416                         netif_stop_queue(dev);
 417                         spin_lock_irqsave(&priv->tx_free_list[qos].lock,
 418                                           flags);
 419                 } else {
 420                         /* If not using normal queueing.  */
 421                         queue_type = QUEUE_DROP;
 422                         goto skip_xmit;
 423                 }
 424         }
 425
 426         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 427                                      CVMX_PKO_LOCK_NONE);
 428
 429         /* Send the packet to the output queue */
 430         if (unlikely(cvmx_pko_send_packet_finish(priv->port,
 431                                                  priv->queue + qos,
 432                                                  pko_command, hw_buffer,
 433                                                  CVMX_PKO_LOCK_NONE))) {
 434                 printk_ratelimited("%s: Failed to send the packet\n",
 435                                    dev->name);
 436                 queue_type = QUEUE_DROP;
 437         }
 438 skip_xmit:
 439         to_free_list = NULL;
 440
 441         switch (queue_type) {
 442         case QUEUE_DROP:
 443                 skb->next = to_free_list;
 444                 to_free_list = skb;
 445                 dev->stats.tx_dropped++;
 446                 break;
 447         case QUEUE_HW:
 448                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
 449                 break;
 450         case QUEUE_CORE:
 451                 __skb_queue_tail(&priv->tx_free_list[qos], skb);
 452                 break;
 453         default:
 454                 BUG();
 455         }
 456
 457         while (skb_to_free > 0) {
 458                 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
 459
 460                 t->next = to_free_list;
 461                 to_free_list = t;
 462                 skb_to_free--;
 463         }
 464
 465         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 466
 467         /* Do the actual freeing outside of the lock. */
 468         while (to_free_list) {
 469                 struct sk_buff *t = to_free_list;
 470
 471                 to_free_list = to_free_list->next;
 472                 dev_kfree_skb_any(t);
 473         }
 474
 475         if (USE_ASYNC_IOBDMA) {
 476                 CVMX_SYNCIOBDMA;
 477                 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 478                 /* Restore the scratch area */
 479                 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 480                 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
 481         } else {
 482                 total_to_clean =
 483                         cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
 484         }
 485
 486         if (total_to_clean & 0x3ff) {
 487                 /*
 488                  * Schedule the cleanup tasklet every 1024 packets for
 489                  * the pathological case of high traffic on one port
 490                  * delaying clean up of packets on a different port
 491                  * that is blocked waiting for the cleanup.
 492                  */
 493                 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 494         }
 495
 496         cvm_oct_kick_tx_poll_watchdog();
 497
 498         return NETDEV_TX_OK;
 499 }
 500
 501 /**
 502  * cvm_oct_xmit_pow - transmit a packet to the POW
 503  * @skb:    Packet to send
 504  * @dev:    Device info structure
 505  * Returns Always returns zero
 506  */
 507 netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
 508 {
 509         struct octeon_ethernet *priv = netdev_priv(dev);
 510         void *packet_buffer;
 511         void *copy_location;
 512
 513         /* Get a work queue entry */
 514         struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
 515
 516         if (unlikely(!work)) {
 517                 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
 518                                    dev->name);
 519                 dev->stats.tx_dropped++;
 520                 dev_kfree_skb_any(skb);
 521                 return 0;
 522         }
 523
 524         /* Get a packet buffer */
 525         packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
 526         if (unlikely(!packet_buffer)) {
 527                 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
 528                                    dev->name);
 529                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
 530                 dev->stats.tx_dropped++;
 531                 dev_kfree_skb_any(skb);
 532                 return 0;
 533         }
 534
 535         /*
 536          * Calculate where we need to copy the data to. We need to
 537          * leave 8 bytes for a next pointer (unused). We also need to
 538          * include any configure skip. Then we need to align the IP
 539          * packet src and dest into the same 64bit word. The below
 540          * calculation may add a little extra, but that doesn't
 541          * hurt.
 542          */
 543         copy_location = packet_buffer + sizeof(u64);
 544         copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
 545
 546         /*
 547          * We have to copy the packet since whoever processes this
 548          * packet will free it to a hardware pool. We can't use the
 549          * trick of counting outstanding packets like in
 550          * cvm_oct_xmit.
 551          */
 552         memcpy(copy_location, skb->data, skb->len);
 553
 554         /*
 555          * Fill in some of the work queue fields. We may need to add
 556          * more if the software at the other end needs them.
 557          */
 558         if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
 559                 work->word0.pip.cn38xx.hw_chksum = skb->csum;
 560         work->word1.len = skb->len;
 561         cvmx_wqe_set_port(work, priv->port);
 562         cvmx_wqe_set_qos(work, priv->port & 0x7);
 563         cvmx_wqe_set_grp(work, pow_send_group);
 564         work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
 565         work->word1.tag = pow_send_group;       /* FIXME */
 566         /* Default to zero. Sets of zero later are commented out */
 567         work->word2.u64 = 0;
 568         work->word2.s.bufs = 1;
 569         work->packet_ptr.u64 = 0;
 570         work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
 571         work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
 572         work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 573         work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
 574
 575         if (skb->protocol == htons(ETH_P_IP)) {
 576                 work->word2.s.ip_offset = 14;
 577 #if 0
 578                 work->word2.s.vlan_valid = 0;   /* FIXME */
 579                 work->word2.s.vlan_cfi = 0;     /* FIXME */
 580                 work->word2.s.vlan_id = 0;      /* FIXME */
 581                 work->word2.s.dec_ipcomp = 0;   /* FIXME */
 582 #endif
 583                 work->word2.s.tcp_or_udp =
 584                     (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 585                     (ip_hdr(skb)->protocol == IPPROTO_UDP);
 586 #if 0
 587                 /* FIXME */
 588                 work->word2.s.dec_ipsec = 0;
 589                 /* We only support IPv4 right now */
 590                 work->word2.s.is_v6 = 0;
 591                 /* Hardware would set to zero */
 592                 work->word2.s.software = 0;
 593                 /* No error, packet is internal */
 594                 work->word2.s.L4_error = 0;
 595 #endif
 596                 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
 597                                           (ip_hdr(skb)->frag_off ==
 598                                               cpu_to_be16(1 << 14)));
 599 #if 0
 600                 /* Assume Linux is sending a good packet */
 601                 work->word2.s.IP_exc = 0;
 602 #endif
 603                 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
 604                 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
 605 #if 0
 606                 /* This is an IP packet */
 607                 work->word2.s.not_IP = 0;
 608                 /* No error, packet is internal */
 609                 work->word2.s.rcv_error = 0;
 610                 /* No error, packet is internal */
 611                 work->word2.s.err_code = 0;
 612 #endif
 613
 614                 /*
 615                  * When copying the data, include 4 bytes of the
 616                  * ethernet header to align the same way hardware
 617                  * does.
 618                  */
 619                 memcpy(work->packet_data, skb->data + 10,
 620                        sizeof(work->packet_data));
 621         } else {
 622 #if 0
 623                 work->word2.snoip.vlan_valid = 0;       /* FIXME */
 624                 work->word2.snoip.vlan_cfi = 0; /* FIXME */
 625                 work->word2.snoip.vlan_id = 0;  /* FIXME */
 626                 work->word2.snoip.software = 0; /* Hardware would set to zero */
 627 #endif
 628                 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
 629                 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
 630                 work->word2.snoip.is_bcast =
 631                     (skb->pkt_type == PACKET_BROADCAST);
 632                 work->word2.snoip.is_mcast =
 633                     (skb->pkt_type == PACKET_MULTICAST);
 634                 work->word2.snoip.not_IP = 1;   /* IP was done up above */
 635 #if 0
 636                 /* No error, packet is internal */
 637                 work->word2.snoip.rcv_error = 0;
 638                 /* No error, packet is internal */
 639                 work->word2.snoip.err_code = 0;
 640 #endif
 641                 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
 642         }
 643
 644         /* Submit the packet to the POW */
 645         cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
 646                              cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
 647         dev->stats.tx_packets++;
 648         dev->stats.tx_bytes += skb->len;
 649         dev_consume_skb_any(skb);
 650         return 0;
 651 }
 652
 653 /**
 654  * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
 655  * @dev:    Device being shutdown
 656  *
 657  */
 658 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
 659 {
 660         struct octeon_ethernet *priv = netdev_priv(dev);
 661         unsigned long flags;
 662         int qos;
 663
 664         for (qos = 0; qos < 16; qos++) {
 665                 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 666                 while (skb_queue_len(&priv->tx_free_list[qos]))
 667                         dev_kfree_skb_any(__skb_dequeue
 668                                           (&priv->tx_free_list[qos]));
 669                 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 670         }
 671 }
 672
 673 static void cvm_oct_tx_do_cleanup(unsigned long arg)
 674 {
 675         int port;
 676
 677         for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
 678                 if (cvm_oct_device[port]) {
 679                         struct net_device *dev = cvm_oct_device[port];
 680
 681                         cvm_oct_free_tx_skbs(dev);
 682                 }
 683         }
 684 }
 685
 686 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
 687 {
 688         /* Disable the interrupt.  */
 689         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 690         /* Do the work in the tasklet.  */
 691         tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 692         return IRQ_HANDLED;
 693 }
 694
 695 void cvm_oct_tx_initialize(void)
 696 {
 697         int i;
 698
 699         /* Disable the interrupt.  */
 700         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 701         /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
 702         i = request_irq(OCTEON_IRQ_TIMER1,
 703                         cvm_oct_tx_cleanup_watchdog, 0,
 704                         "Ethernet", cvm_oct_device);
 705
 706         if (i)
 707                 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
 708 }
 709
 710 void cvm_oct_tx_shutdown(void)
 711 {
 712         /* Free the interrupt handler */
 713         free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
 714 }