drivers/staging/octeon/ethernet-tx.c

   1 /*********************************************************************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2010 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26 *********************************************************************/
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/init.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ip.h>
  33 #include <linux/string.h>
  34 #include <net/dst.h>
  35 #ifdef CONFIG_XFRM
  36 #include <linux/xfrm.h>
  37 #include <net/xfrm.h>
  38 #endif /* CONFIG_XFRM */
  39
  40 #include <asm/atomic.h>
  41
  42 #include <asm/octeon/octeon.h>
  43
  44 #include "ethernet-defines.h"
  45 #include "octeon-ethernet.h"
  46 #include "ethernet-tx.h"
  47 #include "ethernet-util.h"
  48
  49 #include "cvmx-wqe.h"
  50 #include "cvmx-fau.h"
  51 #include "cvmx-pko.h"
  52 #include "cvmx-helper.h"
  53
  54 #include "cvmx-gmxx-defs.h"
  55
  56 /*
  57  * You can define GET_SKBUFF_QOS() to override how the skbuff output
  58  * function determines which output queue is used. The default
  59  * implementation always uses the base queue for the port. If, for
  60  * example, you wanted to use the skb->priority fieid, define
  61  * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
  62  */
  63 #ifndef GET_SKBUFF_QOS
  64 #define GET_SKBUFF_QOS(skb) 0
  65 #endif
  66
  67
  68 static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
  69 {
  70         int32_t undo;
  71         undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
  72         if (undo > 0)
  73                 cvmx_fau_atomic_add32(fau, -undo);
  74         skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free;
  75         return skb_to_free;
  76 }
  77
  78 void cvm_oct_free_tx_skbs(struct octeon_ethernet *priv)
  79 {
  80         int32_t skb_to_free;
  81         int qos, queues_per_port;
  82         queues_per_port = cvmx_pko_get_num_queues(priv->port);
  83         /* Drain any pending packets in the free list */
  84         for (qos = 0; qos < queues_per_port; qos++) {
  85                 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
  86                         continue;
  87                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE);
  88                 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
  89
  90                 while (skb_to_free > 0) {
  91                         dev_kfree_skb_any(skb_dequeue(&priv->tx_free_list[qos]));
  92                         skb_to_free--;
  93                 }
  94         }
  95 }
  96
  97 enum hrtimer_restart cvm_oct_restart_tx(struct hrtimer *timer)
  98 {
  99         struct octeon_ethernet *priv = container_of(timer, struct octeon_ethernet, tx_restart_timer);
 100         struct net_device *dev = cvm_oct_device[priv->port];
 101
 102         cvm_oct_free_tx_skbs(priv);
 103
 104         if (netif_queue_stopped(dev))
 105                 netif_wake_queue(dev);
 106
 107         return HRTIMER_NORESTART;
 108 }
 109
 110 /**
 111  * Packet transmit
 112  *
 113  * @skb:    Packet to send
 114  * @dev:    Device info structure
 115  * Returns Always returns zero
 116  */
 117 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
 118 {
 119         cvmx_pko_command_word0_t pko_command;
 120         union cvmx_buf_ptr hw_buffer;
 121         uint64_t old_scratch;
 122         uint64_t old_scratch2;
 123         int qos;
 124         enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
 125         struct octeon_ethernet *priv = netdev_priv(dev);
 126         struct sk_buff *to_free_list;
 127         int32_t skb_to_free;
 128         int32_t buffers_to_free;
 129         unsigned long flags;
 130 #if REUSE_SKBUFFS_WITHOUT_FREE
 131         unsigned char *fpa_head;
 132 #endif
 133
 134         /*
 135          * Prefetch the private data structure.  It is larger that one
 136          * cache line.
 137          */
 138         prefetch(priv);
 139
 140         /*
 141          * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
 142          * completely remove "qos" in the event neither interface
 143          * supports multiple queues per port.
 144          */
 145         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 146             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 147                 qos = GET_SKBUFF_QOS(skb);
 148                 if (qos <= 0)
 149                         qos = 0;
 150                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 151                         qos = 0;
 152         } else
 153                 qos = 0;
 154
 155         if (USE_ASYNC_IOBDMA) {
 156                 /* Save scratch in case userspace is using it */
 157                 CVMX_SYNCIOBDMA;
 158                 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 159                 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 160
 161                 /*
 162                  * Fetch and increment the number of packets to be
 163                  * freed.
 164                  */
 165                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
 166                                                FAU_NUM_PACKET_BUFFERS_TO_FREE,
 167                                                0);
 168                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 169                                                priv->fau + qos * 4,
 170                                                MAX_SKB_TO_FREE);
 171         }
 172
 173         /*
 174          * The CN3XXX series of parts has an errata (GMX-401) which
 175          * causes the GMX block to hang if a collision occurs towards
 176          * the end of a <68 byte packet. As a workaround for this, we
 177          * pad packets to be 68 bytes whenever we are in half duplex
 178          * mode. We don't handle the case of having a small packet but
 179          * no room to add the padding.  The kernel should always give
 180          * us at least a cache line
 181          */
 182         if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 183                 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
 184                 int interface = INTERFACE(priv->port);
 185                 int index = INDEX(priv->port);
 186
 187                 if (interface < 2) {
 188                         /* We only need to pad packet in half duplex mode */
 189                         gmx_prt_cfg.u64 =
 190                             cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 191                         if (gmx_prt_cfg.s.duplex == 0) {
 192                                 int add_bytes = 64 - skb->len;
 193                                 if ((skb_tail_pointer(skb) + add_bytes) <=
 194                                     skb_end_pointer(skb))
 195                                         memset(__skb_put(skb, add_bytes), 0,
 196                                                add_bytes);
 197                         }
 198                 }
 199         }
 200
 201         /* Build the PKO buffer pointer */
 202         hw_buffer.u64 = 0;
 203         hw_buffer.s.addr = cvmx_ptr_to_phys(skb->data);
 204         hw_buffer.s.pool = 0;
 205         hw_buffer.s.size =
 206             (unsigned long)skb_end_pointer(skb) - (unsigned long)skb->head;
 207
 208         /* Build the PKO command */
 209         pko_command.u64 = 0;
 210         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 211         pko_command.s.segs = 1;
 212         pko_command.s.total_bytes = skb->len;
 213         pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
 214         pko_command.s.subone0 = 1;
 215
 216         pko_command.s.dontfree = 1;
 217         pko_command.s.reg0 = priv->fau + qos * 4;
 218         /*
 219          * See if we can put this skb in the FPA pool. Any strange
 220          * behavior from the Linux networking stack will most likely
 221          * be caused by a bug in the following code. If some field is
 222          * in use by the network stack and get carried over when a
 223          * buffer is reused, bad thing may happen.  If in doubt and
 224          * you dont need the absolute best performance, disable the
 225          * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
 226          * shown a 25% increase in performance under some loads.
 227          */
 228 #if REUSE_SKBUFFS_WITHOUT_FREE
 229         fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
 230         if (unlikely(skb->data < fpa_head)) {
 231                 /*
 232                  * printk("TX buffer beginning can't meet FPA
 233                  * alignment constraints\n");
 234                  */
 235                 goto dont_put_skbuff_in_hw;
 236         }
 237         if (unlikely
 238             ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
 239                 /*
 240                    printk("TX buffer isn't large enough for the FPA\n");
 241                  */
 242                 goto dont_put_skbuff_in_hw;
 243         }
 244         if (unlikely(skb_shared(skb))) {
 245                 /*
 246                    printk("TX buffer sharing data with someone else\n");
 247                  */
 248                 goto dont_put_skbuff_in_hw;
 249         }
 250         if (unlikely(skb_cloned(skb))) {
 251                 /*
 252                    printk("TX buffer has been cloned\n");
 253                  */
 254                 goto dont_put_skbuff_in_hw;
 255         }
 256         if (unlikely(skb_header_cloned(skb))) {
 257                 /*
 258                    printk("TX buffer header has been cloned\n");
 259                  */
 260                 goto dont_put_skbuff_in_hw;
 261         }
 262         if (unlikely(skb->destructor)) {
 263                 /*
 264                    printk("TX buffer has a destructor\n");
 265                  */
 266                 goto dont_put_skbuff_in_hw;
 267         }
 268         if (unlikely(skb_shinfo(skb)->nr_frags)) {
 269                 /*
 270                    printk("TX buffer has fragments\n");
 271                  */
 272                 goto dont_put_skbuff_in_hw;
 273         }
 274         if (unlikely
 275             (skb->truesize !=
 276              sizeof(*skb) + skb_end_pointer(skb) - skb->head)) {
 277                 /*
 278                    printk("TX buffer truesize has been changed\n");
 279                  */
 280                 goto dont_put_skbuff_in_hw;
 281         }
 282
 283         /*
 284          * We can use this buffer in the FPA.  We don't need the FAU
 285          * update anymore
 286          */
 287         pko_command.s.reg0 = 0;
 288         pko_command.s.dontfree = 0;
 289
 290         hw_buffer.s.back = ((unsigned long)skb->data >> 7) - ((unsigned long)fpa_head >> 7);
 291         *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
 292
 293         /*
 294          * The skbuff will be reused without ever being freed. We must
 295          * cleanup a bunch of core things.
 296          */
 297         dst_release(skb_dst(skb));
 298         skb_dst_set(skb, NULL);
 299 #ifdef CONFIG_XFRM
 300         secpath_put(skb->sp);
 301         skb->sp = NULL;
 302 #endif
 303         nf_reset(skb);
 304
 305 #ifdef CONFIG_NET_SCHED
 306         skb->tc_index = 0;
 307 #ifdef CONFIG_NET_CLS_ACT
 308         skb->tc_verd = 0;
 309 #endif /* CONFIG_NET_CLS_ACT */
 310 #endif /* CONFIG_NET_SCHED */
 311 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
 312
 313 dont_put_skbuff_in_hw:
 314
 315         /* Check if we can use the hardware checksumming */
 316         if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
 317             (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
 318             ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14))
 319             && ((ip_hdr(skb)->protocol == IP_PROTOCOL_TCP)
 320                 || (ip_hdr(skb)->protocol == IP_PROTOCOL_UDP))) {
 321                 /* Use hardware checksum calc */
 322                 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
 323         }
 324
 325         if (USE_ASYNC_IOBDMA) {
 326                 /* Get the number of skbuffs in use by the hardware */
 327                 CVMX_SYNCIOBDMA;
 328                 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 329                 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 330         } else {
 331                 /* Get the number of skbuffs in use by the hardware */
 332                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 333                                                        MAX_SKB_TO_FREE);
 334                 buffers_to_free =
 335                     cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
 336         }
 337
 338         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
 339
 340         /*
 341          * If we're sending faster than the receive can free them then
 342          * don't do the HW free.
 343          */
 344         if ((buffers_to_free < -100) && !pko_command.s.dontfree) {
 345                 pko_command.s.dontfree = 1;
 346                 pko_command.s.reg0 = priv->fau + qos * 4;
 347         }
 348
 349         if (pko_command.s.dontfree)
 350                 queue_type = QUEUE_CORE;
 351         else
 352                 queue_type = QUEUE_HW;
 353
 354         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 355
 356         /* Drop this packet if we have too many already queued to the HW */
 357         if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
 358                 if (dev->tx_queue_len != 0) {
 359                         /* Drop the lock when notifying the core.  */
 360                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 361                         netif_stop_queue(dev);
 362                         hrtimer_start(&priv->tx_restart_timer,
 363                                       priv->tx_restart_interval, HRTIMER_MODE_REL);
 364                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 365
 366                 } else {
 367                         /* If not using normal queueing.  */
 368                         queue_type = QUEUE_DROP;
 369                         goto skip_xmit;
 370                 }
 371         }
 372
 373         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 374                                      CVMX_PKO_LOCK_NONE);
 375
 376         /* Send the packet to the output queue */
 377         if (unlikely(cvmx_pko_send_packet_finish(priv->port,
 378                                                  priv->queue + qos,
 379                                                  pko_command, hw_buffer,
 380                                                  CVMX_PKO_LOCK_NONE))) {
 381                 DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
 382                 queue_type = QUEUE_DROP;
 383         }
 384 skip_xmit:
 385         to_free_list = NULL;
 386
 387         switch (queue_type) {
 388         case QUEUE_DROP:
 389                 skb->next = to_free_list;
 390                 to_free_list = skb;
 391                 priv->stats.tx_dropped++;
 392                 break;
 393         case QUEUE_HW:
 394                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
 395                 break;
 396         case QUEUE_CORE:
 397                 __skb_queue_tail(&priv->tx_free_list[qos], skb);
 398                 break;
 399         default:
 400                 BUG();
 401         }
 402
 403         while (skb_to_free > 0) {
 404                 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
 405                 t->next = to_free_list;
 406                 to_free_list = t;
 407                 skb_to_free--;
 408         }
 409
 410         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 411
 412         /* Do the actual freeing outside of the lock. */
 413         while (to_free_list) {
 414                 struct sk_buff *t = to_free_list;
 415                 to_free_list = to_free_list->next;
 416                 dev_kfree_skb_any(t);
 417         }
 418
 419         if (USE_ASYNC_IOBDMA) {
 420                 /* Restore the scratch area */
 421                 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 422                 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
 423         }
 424
 425         return NETDEV_TX_OK;
 426 }
 427
 428 /**
 429  * Packet transmit to the POW
 430  *
 431  * @skb:    Packet to send
 432  * @dev:    Device info structure
 433  * Returns Always returns zero
 434  */
 435 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
 436 {
 437         struct octeon_ethernet *priv = netdev_priv(dev);
 438         void *packet_buffer;
 439         void *copy_location;
 440
 441         /* Get a work queue entry */
 442         cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
 443         if (unlikely(work == NULL)) {
 444                 DEBUGPRINT("%s: Failed to allocate a work queue entry\n",
 445                            dev->name);
 446                 priv->stats.tx_dropped++;
 447                 dev_kfree_skb(skb);
 448                 return 0;
 449         }
 450
 451         /* Get a packet buffer */
 452         packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
 453         if (unlikely(packet_buffer == NULL)) {
 454                 DEBUGPRINT("%s: Failed to allocate a packet buffer\n",
 455                            dev->name);
 456                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
 457                 priv->stats.tx_dropped++;
 458                 dev_kfree_skb(skb);
 459                 return 0;
 460         }
 461
 462         /*
 463          * Calculate where we need to copy the data to. We need to
 464          * leave 8 bytes for a next pointer (unused). We also need to
 465          * include any configure skip. Then we need to align the IP
 466          * packet src and dest into the same 64bit word. The below
 467          * calculation may add a little extra, but that doesn't
 468          * hurt.
 469          */
 470         copy_location = packet_buffer + sizeof(uint64_t);
 471         copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
 472
 473         /*
 474          * We have to copy the packet since whoever processes this
 475          * packet will free it to a hardware pool. We can't use the
 476          * trick of counting outstanding packets like in
 477          * cvm_oct_xmit.
 478          */
 479         memcpy(copy_location, skb->data, skb->len);
 480
 481         /*
 482          * Fill in some of the work queue fields. We may need to add
 483          * more if the software at the other end needs them.
 484          */
 485         work->hw_chksum = skb->csum;
 486         work->len = skb->len;
 487         work->ipprt = priv->port;
 488         work->qos = priv->port & 0x7;
 489         work->grp = pow_send_group;
 490         work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
 491         work->tag = pow_send_group;     /* FIXME */
 492         /* Default to zero. Sets of zero later are commented out */
 493         work->word2.u64 = 0;
 494         work->word2.s.bufs = 1;
 495         work->packet_ptr.u64 = 0;
 496         work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
 497         work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
 498         work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 499         work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
 500
 501         if (skb->protocol == htons(ETH_P_IP)) {
 502                 work->word2.s.ip_offset = 14;
 503 #if 0
 504                 work->word2.s.vlan_valid = 0;   /* FIXME */
 505                 work->word2.s.vlan_cfi = 0;     /* FIXME */
 506                 work->word2.s.vlan_id = 0;      /* FIXME */
 507                 work->word2.s.dec_ipcomp = 0;   /* FIXME */
 508 #endif
 509                 work->word2.s.tcp_or_udp =
 510                     (ip_hdr(skb)->protocol == IP_PROTOCOL_TCP)
 511                     || (ip_hdr(skb)->protocol == IP_PROTOCOL_UDP);
 512 #if 0
 513                 /* FIXME */
 514                 work->word2.s.dec_ipsec = 0;
 515                 /* We only support IPv4 right now */
 516                 work->word2.s.is_v6 = 0;
 517                 /* Hardware would set to zero */
 518                 work->word2.s.software = 0;
 519                 /* No error, packet is internal */
 520                 work->word2.s.L4_error = 0;
 521 #endif
 522                 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
 523                                           || (ip_hdr(skb)->frag_off ==
 524                                               1 << 14));
 525 #if 0
 526                 /* Assume Linux is sending a good packet */
 527                 work->word2.s.IP_exc = 0;
 528 #endif
 529                 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
 530                 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
 531 #if 0
 532                 /* This is an IP packet */
 533                 work->word2.s.not_IP = 0;
 534                 /* No error, packet is internal */
 535                 work->word2.s.rcv_error = 0;
 536                 /* No error, packet is internal */
 537                 work->word2.s.err_code = 0;
 538 #endif
 539
 540                 /*
 541                  * When copying the data, include 4 bytes of the
 542                  * ethernet header to align the same way hardware
 543                  * does.
 544                  */
 545                 memcpy(work->packet_data, skb->data + 10,
 546                        sizeof(work->packet_data));
 547         } else {
 548 #if 0
 549                 work->word2.snoip.vlan_valid = 0;       /* FIXME */
 550                 work->word2.snoip.vlan_cfi = 0; /* FIXME */
 551                 work->word2.snoip.vlan_id = 0;  /* FIXME */
 552                 work->word2.snoip.software = 0; /* Hardware would set to zero */
 553 #endif
 554                 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
 555                 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
 556                 work->word2.snoip.is_bcast =
 557                     (skb->pkt_type == PACKET_BROADCAST);
 558                 work->word2.snoip.is_mcast =
 559                     (skb->pkt_type == PACKET_MULTICAST);
 560                 work->word2.snoip.not_IP = 1;   /* IP was done up above */
 561 #if 0
 562                 /* No error, packet is internal */
 563                 work->word2.snoip.rcv_error = 0;
 564                 /* No error, packet is internal */
 565                 work->word2.snoip.err_code = 0;
 566 #endif
 567                 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
 568         }
 569
 570         /* Submit the packet to the POW */
 571         cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
 572                              work->grp);
 573         priv->stats.tx_packets++;
 574         priv->stats.tx_bytes += skb->len;
 575         dev_kfree_skb(skb);
 576         return 0;
 577 }
 578
 579 /**
 580  * This function frees all skb that are currently queued for TX.
 581  *
 582  * @dev:    Device being shutdown
 583  */
 584 void cvm_oct_tx_shutdown(struct net_device *dev)
 585 {
 586         struct octeon_ethernet *priv = netdev_priv(dev);
 587         unsigned long flags;
 588         int qos;
 589
 590         for (qos = 0; qos < 16; qos++) {
 591                 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 592                 while (skb_queue_len(&priv->tx_free_list[qos]))
 593                         dev_kfree_skb_any(__skb_dequeue
 594                                           (&priv->tx_free_list[qos]));
 595                 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 596         }
 597 }