drivers/net/ethernet/microchip/sparx5/sparx5_packet.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Microchip Sparx5 Switch driver
   3  *
   4  * Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
   5  */
   6
   7 #include "sparx5_main_regs.h"
   8 #include "sparx5_main.h"
   9
  10 #define XTR_EOF_0     ntohl((__force __be32)0x80000000u)
  11 #define XTR_EOF_1     ntohl((__force __be32)0x80000001u)
  12 #define XTR_EOF_2     ntohl((__force __be32)0x80000002u)
  13 #define XTR_EOF_3     ntohl((__force __be32)0x80000003u)
  14 #define XTR_PRUNED    ntohl((__force __be32)0x80000004u)
  15 #define XTR_ABORT     ntohl((__force __be32)0x80000005u)
  16 #define XTR_ESCAPE    ntohl((__force __be32)0x80000006u)
  17 #define XTR_NOT_READY ntohl((__force __be32)0x80000007u)
  18
  19 #define XTR_VALID_BYTES(x)      (4 - ((x) & 3))
  20
  21 #define INJ_TIMEOUT_NS 50000
  22
  23 void sparx5_xtr_flush(struct sparx5 *sparx5, u8 grp)
  24 {
  25         /* Start flush */
  26         spx5_wr(QS_XTR_FLUSH_FLUSH_SET(BIT(grp)), sparx5, QS_XTR_FLUSH);
  27
  28         /* Allow to drain */
  29         mdelay(1);
  30
  31         /* All Queues normal */
  32         spx5_wr(0, sparx5, QS_XTR_FLUSH);
  33 }
  34
  35 void sparx5_ifh_parse(u32 *ifh, struct frame_info *info)
  36 {
  37         u8 *xtr_hdr = (u8 *)ifh;
  38
  39         /* FWD is bit 45-72 (28 bits), but we only read the 27 LSB for now */
  40         u32 fwd =
  41                 ((u32)xtr_hdr[27] << 24) |
  42                 ((u32)xtr_hdr[28] << 16) |
  43                 ((u32)xtr_hdr[29] <<  8) |
  44                 ((u32)xtr_hdr[30] <<  0);
  45         fwd = (fwd >> 5);
  46         info->src_port = FIELD_GET(GENMASK(7, 1), fwd);
  47
  48         info->timestamp =
  49                 ((u64)xtr_hdr[2] << 24) |
  50                 ((u64)xtr_hdr[3] << 16) |
  51                 ((u64)xtr_hdr[4] <<  8) |
  52                 ((u64)xtr_hdr[5] <<  0);
  53 }
  54
  55 static void sparx5_xtr_grp(struct sparx5 *sparx5, u8 grp, bool byte_swap)
  56 {
  57         bool eof_flag = false, pruned_flag = false, abort_flag = false;
  58         struct net_device *netdev;
  59         struct sparx5_port *port;
  60         struct frame_info fi;
  61         int i, byte_cnt = 0;
  62         struct sk_buff *skb;
  63         u32 ifh[IFH_LEN];
  64         u32 *rxbuf;
  65
  66         /* Get IFH */
  67         for (i = 0; i < IFH_LEN; i++)
  68                 ifh[i] = spx5_rd(sparx5, QS_XTR_RD(grp));
  69
  70         /* Decode IFH (what's needed) */
  71         sparx5_ifh_parse(ifh, &fi);
  72
  73         /* Map to port netdev */
  74         port = fi.src_port < SPX5_PORTS ?
  75                 sparx5->ports[fi.src_port] : NULL;
  76         if (!port || !port->ndev) {
  77                 dev_err(sparx5->dev, "Data on inactive port %d\n", fi.src_port);
  78                 sparx5_xtr_flush(sparx5, grp);
  79                 return;
  80         }
  81
  82         /* Have netdev, get skb */
  83         netdev = port->ndev;
  84         skb = netdev_alloc_skb(netdev, netdev->mtu + ETH_HLEN);
  85         if (!skb) {
  86                 sparx5_xtr_flush(sparx5, grp);
  87                 dev_err(sparx5->dev, "No skb allocated\n");
  88                 netdev->stats.rx_dropped++;
  89                 return;
  90         }
  91         rxbuf = (u32 *)skb->data;
  92
  93         /* Now, pull frame data */
  94         while (!eof_flag) {
  95                 u32 val = spx5_rd(sparx5, QS_XTR_RD(grp));
  96                 u32 cmp = val;
  97
  98                 if (byte_swap)
  99                         cmp = ntohl((__force __be32)val);
 100
 101                 switch (cmp) {
 102                 case XTR_NOT_READY:
 103                         break;
 104                 case XTR_ABORT:
 105                         /* No accompanying data */
 106                         abort_flag = true;
 107                         eof_flag = true;
 108                         break;
 109                 case XTR_EOF_0:
 110                 case XTR_EOF_1:
 111                 case XTR_EOF_2:
 112                 case XTR_EOF_3:
 113                         /* This assumes STATUS_WORD_POS == 1, Status
 114                          * just after last data
 115                          */
 116                         if (!byte_swap)
 117                                 val = ntohl((__force __be32)val);
 118                         byte_cnt -= (4 - XTR_VALID_BYTES(val));
 119                         eof_flag = true;
 120                         break;
 121                 case XTR_PRUNED:
 122                         /* But get the last 4 bytes as well */
 123                         eof_flag = true;
 124                         pruned_flag = true;
 125                         fallthrough;
 126                 case XTR_ESCAPE:
 127                         *rxbuf = spx5_rd(sparx5, QS_XTR_RD(grp));
 128                         byte_cnt += 4;
 129                         rxbuf++;
 130                         break;
 131                 default:
 132                         *rxbuf = val;
 133                         byte_cnt += 4;
 134                         rxbuf++;
 135                 }
 136         }
 137
 138         if (abort_flag || pruned_flag || !eof_flag) {
 139                 netdev_err(netdev, "Discarded frame: abort:%d pruned:%d eof:%d\n",
 140                            abort_flag, pruned_flag, eof_flag);
 141                 kfree_skb(skb);
 142                 netdev->stats.rx_dropped++;
 143                 return;
 144         }
 145
 146         /* Everything we see on an interface that is in the HW bridge
 147          * has already been forwarded
 148          */
 149         if (test_bit(port->portno, sparx5->bridge_mask))
 150                 skb->offload_fwd_mark = 1;
 151
 152         /* Finish up skb */
 153         skb_put(skb, byte_cnt - ETH_FCS_LEN);
 154         eth_skb_pad(skb);
 155         sparx5_ptp_rxtstamp(sparx5, skb, fi.timestamp);
 156         skb->protocol = eth_type_trans(skb, netdev);
 157         netdev->stats.rx_bytes += skb->len;
 158         netdev->stats.rx_packets++;
 159         netif_rx(skb);
 160 }
 161
 162 static int sparx5_inject(struct sparx5 *sparx5,
 163                          u32 *ifh,
 164                          struct sk_buff *skb,
 165                          struct net_device *ndev)
 166 {
 167         int grp = INJ_QUEUE;
 168         u32 val, w, count;
 169         u8 *buf;
 170
 171         val = spx5_rd(sparx5, QS_INJ_STATUS);
 172         if (!(QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp))) {
 173                 pr_err_ratelimited("Injection: Queue not ready: 0x%lx\n",
 174                                    QS_INJ_STATUS_FIFO_RDY_GET(val));
 175                 return -EBUSY;
 176         }
 177
 178         /* Indicate SOF */
 179         spx5_wr(QS_INJ_CTRL_SOF_SET(1) |
 180                 QS_INJ_CTRL_GAP_SIZE_SET(1),
 181                 sparx5, QS_INJ_CTRL(grp));
 182
 183         /* Write the IFH to the chip. */
 184         for (w = 0; w < IFH_LEN; w++)
 185                 spx5_wr(ifh[w], sparx5, QS_INJ_WR(grp));
 186
 187         /* Write words, round up */
 188         count = DIV_ROUND_UP(skb->len, 4);
 189         buf = skb->data;
 190         for (w = 0; w < count; w++, buf += 4) {
 191                 val = get_unaligned((const u32 *)buf);
 192                 spx5_wr(val, sparx5, QS_INJ_WR(grp));
 193         }
 194
 195         /* Add padding */
 196         while (w < (60 / 4)) {
 197                 spx5_wr(0, sparx5, QS_INJ_WR(grp));
 198                 w++;
 199         }
 200
 201         /* Indicate EOF and valid bytes in last word */
 202         spx5_wr(QS_INJ_CTRL_GAP_SIZE_SET(1) |
 203                 QS_INJ_CTRL_VLD_BYTES_SET(skb->len < 60 ? 0 : skb->len % 4) |
 204                 QS_INJ_CTRL_EOF_SET(1),
 205                 sparx5, QS_INJ_CTRL(grp));
 206
 207         /* Add dummy CRC */
 208         spx5_wr(0, sparx5, QS_INJ_WR(grp));
 209         w++;
 210
 211         val = spx5_rd(sparx5, QS_INJ_STATUS);
 212         if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
 213                 struct sparx5_port *port = netdev_priv(ndev);
 214
 215                 pr_err_ratelimited("Injection: Watermark reached: 0x%lx\n",
 216                                    QS_INJ_STATUS_WMARK_REACHED_GET(val));
 217                 netif_stop_queue(ndev);
 218                 hrtimer_start(&port->inj_timer, INJ_TIMEOUT_NS,
 219                               HRTIMER_MODE_REL);
 220         }
 221
 222         return NETDEV_TX_OK;
 223 }
 224
 225 netdev_tx_t sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev)
 226 {
 227         struct net_device_stats *stats = &dev->stats;
 228         struct sparx5_port *port = netdev_priv(dev);
 229         struct sparx5 *sparx5 = port->sparx5;
 230         u32 ifh[IFH_LEN];
 231         netdev_tx_t ret;
 232
 233         memset(ifh, 0, IFH_LEN * 4);
 234         sparx5_set_port_ifh(ifh, port->portno);
 235
 236         if (sparx5->ptp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
 237                 if (sparx5_ptp_txtstamp_request(port, skb) < 0)
 238                         return NETDEV_TX_BUSY;
 239
 240                 sparx5_set_port_ifh_rew_op(ifh, SPARX5_SKB_CB(skb)->rew_op);
 241                 sparx5_set_port_ifh_pdu_type(ifh, SPARX5_SKB_CB(skb)->pdu_type);
 242                 sparx5_set_port_ifh_pdu_w16_offset(ifh, SPARX5_SKB_CB(skb)->pdu_w16_offset);
 243                 sparx5_set_port_ifh_timestamp(ifh, SPARX5_SKB_CB(skb)->ts_id);
 244         }
 245
 246         skb_tx_timestamp(skb);
 247         spin_lock(&sparx5->tx_lock);
 248         if (sparx5->fdma_irq > 0)
 249                 ret = sparx5_fdma_xmit(sparx5, ifh, skb);
 250         else
 251                 ret = sparx5_inject(sparx5, ifh, skb, dev);
 252         spin_unlock(&sparx5->tx_lock);
 253
 254         if (ret == -EBUSY)
 255                 goto busy;
 256         if (ret < 0)
 257                 goto drop;
 258
 259         stats->tx_bytes += skb->len;
 260         stats->tx_packets++;
 261         sparx5->tx.packets++;
 262
 263         if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
 264             SPARX5_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
 265                 return NETDEV_TX_OK;
 266
 267         dev_consume_skb_any(skb);
 268         return NETDEV_TX_OK;
 269 drop:
 270         stats->tx_dropped++;
 271         sparx5->tx.dropped++;
 272         dev_kfree_skb_any(skb);
 273         return NETDEV_TX_OK;
 274 busy:
 275         if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
 276             SPARX5_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP)
 277                 sparx5_ptp_txtstamp_release(port, skb);
 278         return NETDEV_TX_BUSY;
 279 }
 280
 281 static enum hrtimer_restart sparx5_injection_timeout(struct hrtimer *tmr)
 282 {
 283         struct sparx5_port *port = container_of(tmr, struct sparx5_port,
 284                                                 inj_timer);
 285         int grp = INJ_QUEUE;
 286         u32 val;
 287
 288         val = spx5_rd(port->sparx5, QS_INJ_STATUS);
 289         if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
 290                 pr_err_ratelimited("Injection: Reset watermark count\n");
 291                 /* Reset Watermark count to restart */
 292                 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
 293                          DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
 294                          port->sparx5,
 295                          DSM_DEV_TX_STOP_WM_CFG(port->portno));
 296         }
 297         netif_wake_queue(port->ndev);
 298         return HRTIMER_NORESTART;
 299 }
 300
 301 int sparx5_manual_injection_mode(struct sparx5 *sparx5)
 302 {
 303         const int byte_swap = 1;
 304         int portno;
 305
 306         /* Change mode to manual extraction and injection */
 307         spx5_wr(QS_XTR_GRP_CFG_MODE_SET(1) |
 308                 QS_XTR_GRP_CFG_STATUS_WORD_POS_SET(1) |
 309                 QS_XTR_GRP_CFG_BYTE_SWAP_SET(byte_swap),
 310                 sparx5, QS_XTR_GRP_CFG(XTR_QUEUE));
 311         spx5_wr(QS_INJ_GRP_CFG_MODE_SET(1) |
 312                 QS_INJ_GRP_CFG_BYTE_SWAP_SET(byte_swap),
 313                 sparx5, QS_INJ_GRP_CFG(INJ_QUEUE));
 314
 315         /* CPU ports capture setup */
 316         for (portno = SPX5_PORT_CPU_0; portno <= SPX5_PORT_CPU_1; portno++) {
 317                 /* ASM CPU port: No preamble, IFH, enable padding */
 318                 spx5_wr(ASM_PORT_CFG_PAD_ENA_SET(1) |
 319                         ASM_PORT_CFG_NO_PREAMBLE_ENA_SET(1) |
 320                         ASM_PORT_CFG_INJ_FORMAT_CFG_SET(1), /* 1 = IFH */
 321                         sparx5, ASM_PORT_CFG(portno));
 322
 323                 /* Reset WM cnt to unclog queued frames */
 324                 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
 325                          DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
 326                          sparx5,
 327                          DSM_DEV_TX_STOP_WM_CFG(portno));
 328
 329                 /* Set Disassembler Stop Watermark level */
 330                 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM_SET(0),
 331                          DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM,
 332                          sparx5,
 333                          DSM_DEV_TX_STOP_WM_CFG(portno));
 334
 335                 /* Enable Disassembler buffer underrun watchdog
 336                  */
 337                 spx5_rmw(DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS_SET(0),
 338                          DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS,
 339                          sparx5,
 340                          DSM_BUF_CFG(portno));
 341         }
 342         return 0;
 343 }
 344
 345 irqreturn_t sparx5_xtr_handler(int irq, void *_sparx5)
 346 {
 347         struct sparx5 *s5 = _sparx5;
 348         int poll = 64;
 349
 350         /* Check data in queue */
 351         while (spx5_rd(s5, QS_XTR_DATA_PRESENT) & BIT(XTR_QUEUE) && poll-- > 0)
 352                 sparx5_xtr_grp(s5, XTR_QUEUE, false);
 353
 354         return IRQ_HANDLED;
 355 }
 356
 357 void sparx5_port_inj_timer_setup(struct sparx5_port *port)
 358 {
 359         hrtimer_init(&port->inj_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 360         port->inj_timer.function = sparx5_injection_timeout;
 361 }