drivers/staging/octeon/ethernet-tx.c

   1 /*
   2  * This file is based on code from OCTEON SDK by Cavium Networks.
   3  *
   4  * Copyright (c) 2003-2010 Cavium Networks
   5  *
   6  * This file is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, Version 2, as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/ip.h>
  16 #include <linux/ratelimit.h>
  17 #include <linux/string.h>
  18 #include <linux/interrupt.h>
  19 #include <net/dst.h>
  20 #ifdef CONFIG_XFRM
  21 #include <linux/xfrm.h>
  22 #include <net/xfrm.h>
  23 #endif /* CONFIG_XFRM */
  24
  25 #include <linux/atomic.h>
  26
  27 #include <asm/octeon/octeon.h>
  28
  29 #include "ethernet-defines.h"
  30 #include "octeon-ethernet.h"
  31 #include "ethernet-tx.h"
  32 #include "ethernet-util.h"
  33
  34 #include <asm/octeon/cvmx-wqe.h>
  35 #include <asm/octeon/cvmx-fau.h>
  36 #include <asm/octeon/cvmx-pip.h>
  37 #include <asm/octeon/cvmx-pko.h>
  38 #include <asm/octeon/cvmx-helper.h>
  39
  40 #include <asm/octeon/cvmx-gmxx-defs.h>
  41
  42 #define CVM_OCT_SKB_CB(skb)     ((u64 *)((skb)->cb))
  43
  44 /*
  45  * You can define GET_SKBUFF_QOS() to override how the skbuff output
  46  * function determines which output queue is used. The default
  47  * implementation always uses the base queue for the port. If, for
  48  * example, you wanted to use the skb->priority field, define
  49  * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
  50  */
  51 #ifndef GET_SKBUFF_QOS
  52 #define GET_SKBUFF_QOS(skb) 0
  53 #endif
  54
  55 static void cvm_oct_tx_do_cleanup(unsigned long arg);
  56 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
  57
  58 /* Maximum number of SKBs to try to free per xmit packet. */
  59 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
  60
  61 static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
  62 {
  63         int32_t undo;
  64
  65         undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
  66                                                    MAX_SKB_TO_FREE;
  67         if (undo > 0)
  68                 cvmx_fau_atomic_add32(fau, -undo);
  69         skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
  70                                                        -skb_to_free;
  71         return skb_to_free;
  72 }
  73
  74 static void cvm_oct_kick_tx_poll_watchdog(void)
  75 {
  76         union cvmx_ciu_timx ciu_timx;
  77
  78         ciu_timx.u64 = 0;
  79         ciu_timx.s.one_shot = 1;
  80         ciu_timx.s.len = cvm_oct_tx_poll_interval;
  81         cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
  82 }
  83
  84 static void cvm_oct_free_tx_skbs(struct net_device *dev)
  85 {
  86         int32_t skb_to_free;
  87         int qos, queues_per_port;
  88         int total_freed = 0;
  89         int total_remaining = 0;
  90         unsigned long flags;
  91         struct octeon_ethernet *priv = netdev_priv(dev);
  92
  93         queues_per_port = cvmx_pko_get_num_queues(priv->port);
  94         /* Drain any pending packets in the free list */
  95         for (qos = 0; qos < queues_per_port; qos++) {
  96                 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
  97                         continue;
  98                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
  99                                                        MAX_SKB_TO_FREE);
 100                 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 101                                                          priv->fau + qos * 4);
 102                 total_freed += skb_to_free;
 103                 if (skb_to_free > 0) {
 104                         struct sk_buff *to_free_list = NULL;
 105
 106                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 107                         while (skb_to_free > 0) {
 108                                 struct sk_buff *t;
 109
 110                                 t = __skb_dequeue(&priv->tx_free_list[qos]);
 111                                 t->next = to_free_list;
 112                                 to_free_list = t;
 113                                 skb_to_free--;
 114                         }
 115                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 116                                                flags);
 117                         /* Do the actual freeing outside of the lock. */
 118                         while (to_free_list) {
 119                                 struct sk_buff *t = to_free_list;
 120
 121                                 to_free_list = to_free_list->next;
 122                                 dev_kfree_skb_any(t);
 123                         }
 124                 }
 125                 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
 126         }
 127         if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
 128                 netif_wake_queue(dev);
 129         if (total_remaining)
 130                 cvm_oct_kick_tx_poll_watchdog();
 131 }
 132
 133 /**
 134  * cvm_oct_xmit - transmit a packet
 135  * @skb:    Packet to send
 136  * @dev:    Device info structure
 137  *
 138  * Returns Always returns NETDEV_TX_OK
 139  */
 140 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
 141 {
 142         cvmx_pko_command_word0_t pko_command;
 143         union cvmx_buf_ptr hw_buffer;
 144         u64 old_scratch;
 145         u64 old_scratch2;
 146         int qos;
 147         int i;
 148         enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
 149         struct octeon_ethernet *priv = netdev_priv(dev);
 150         struct sk_buff *to_free_list;
 151         int32_t skb_to_free;
 152         int32_t buffers_to_free;
 153         u32 total_to_clean;
 154         unsigned long flags;
 155 #if REUSE_SKBUFFS_WITHOUT_FREE
 156         unsigned char *fpa_head;
 157 #endif
 158
 159         /*
 160          * Prefetch the private data structure.  It is larger than the
 161          * one cache line.
 162          */
 163         prefetch(priv);
 164
 165         /*
 166          * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
 167          * completely remove "qos" in the event neither interface
 168          * supports multiple queues per port.
 169          */
 170         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 171             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 172                 qos = GET_SKBUFF_QOS(skb);
 173                 if (qos <= 0)
 174                         qos = 0;
 175                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 176                         qos = 0;
 177         } else {
 178                 qos = 0;
 179         }
 180
 181         if (USE_ASYNC_IOBDMA) {
 182                 /* Save scratch in case userspace is using it */
 183                 CVMX_SYNCIOBDMA;
 184                 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 185                 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 186
 187                 /*
 188                  * Fetch and increment the number of packets to be
 189                  * freed.
 190                  */
 191                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
 192                                                FAU_NUM_PACKET_BUFFERS_TO_FREE,
 193                                                0);
 194                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 195                                                priv->fau + qos * 4,
 196                                                MAX_SKB_TO_FREE);
 197         }
 198
 199         /*
 200          * We have space for 6 segment pointers, If there will be more
 201          * than that, we must linearize.
 202          */
 203         if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
 204                 if (unlikely(__skb_linearize(skb))) {
 205                         queue_type = QUEUE_DROP;
 206                         if (USE_ASYNC_IOBDMA) {
 207                                 /*
 208                                  * Get the number of skbuffs in use
 209                                  * by the hardware
 210                                  */
 211                                 CVMX_SYNCIOBDMA;
 212                                 skb_to_free =
 213                                         cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 214                         } else {
 215                                 /*
 216                                  * Get the number of skbuffs in use
 217                                  * by the hardware
 218                                  */
 219                                 skb_to_free = cvmx_fau_fetch_and_add32(
 220                                         priv->fau + qos * 4, MAX_SKB_TO_FREE);
 221                         }
 222                         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 223                                                         priv->fau + qos * 4);
 224                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 225                         goto skip_xmit;
 226                 }
 227         }
 228
 229         /*
 230          * The CN3XXX series of parts has an errata (GMX-401) which
 231          * causes the GMX block to hang if a collision occurs towards
 232          * the end of a <68 byte packet. As a workaround for this, we
 233          * pad packets to be 68 bytes whenever we are in half duplex
 234          * mode. We don't handle the case of having a small packet but
 235          * no room to add the padding.  The kernel should always give
 236          * us at least a cache line
 237          */
 238         if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 239                 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
 240                 int interface = INTERFACE(priv->port);
 241                 int index = INDEX(priv->port);
 242
 243                 if (interface < 2) {
 244                         /* We only need to pad packet in half duplex mode */
 245                         gmx_prt_cfg.u64 =
 246                             cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 247                         if (gmx_prt_cfg.s.duplex == 0) {
 248                                 int add_bytes = 64 - skb->len;
 249
 250                                 if ((skb_tail_pointer(skb) + add_bytes) <=
 251                                     skb_end_pointer(skb))
 252                                         memset(__skb_put(skb, add_bytes), 0,
 253                                                add_bytes);
 254                         }
 255                 }
 256         }
 257
 258         /* Build the PKO command */
 259         pko_command.u64 = 0;
 260 #ifdef __LITTLE_ENDIAN
 261         pko_command.s.le = 1;
 262 #endif
 263         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 264         pko_command.s.segs = 1;
 265         pko_command.s.total_bytes = skb->len;
 266         pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
 267         pko_command.s.subone0 = 1;
 268
 269         pko_command.s.dontfree = 1;
 270
 271         /* Build the PKO buffer pointer */
 272         hw_buffer.u64 = 0;
 273         if (skb_shinfo(skb)->nr_frags == 0) {
 274                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
 275                 hw_buffer.s.pool = 0;
 276                 hw_buffer.s.size = skb->len;
 277         } else {
 278                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
 279                 hw_buffer.s.pool = 0;
 280                 hw_buffer.s.size = skb_headlen(skb);
 281                 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
 282                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 283                         struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
 284
 285                         hw_buffer.s.addr = XKPHYS_TO_PHYS(
 286                                 (u64)(page_address(fs->page.p) +
 287                                 fs->page_offset));
 288                         hw_buffer.s.size = fs->size;
 289                         CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
 290                 }
 291                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
 292                 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
 293                 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
 294                 pko_command.s.gather = 1;
 295                 goto dont_put_skbuff_in_hw;
 296         }
 297
 298         /*
 299          * See if we can put this skb in the FPA pool. Any strange
 300          * behavior from the Linux networking stack will most likely
 301          * be caused by a bug in the following code. If some field is
 302          * in use by the network stack and gets carried over when a
 303          * buffer is reused, bad things may happen.  If in doubt and
 304          * you dont need the absolute best performance, disable the
 305          * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
 306          * shown a 25% increase in performance under some loads.
 307          */
 308 #if REUSE_SKBUFFS_WITHOUT_FREE
 309         fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
 310         if (unlikely(skb->data < fpa_head)) {
 311                 /* TX buffer beginning can't meet FPA alignment constraints */
 312                 goto dont_put_skbuff_in_hw;
 313         }
 314         if (unlikely
 315             ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
 316                 /* TX buffer isn't large enough for the FPA */
 317                 goto dont_put_skbuff_in_hw;
 318         }
 319         if (unlikely(skb_shared(skb))) {
 320                 /* TX buffer sharing data with someone else */
 321                 goto dont_put_skbuff_in_hw;
 322         }
 323         if (unlikely(skb_cloned(skb))) {
 324                 /* TX buffer has been cloned */
 325                 goto dont_put_skbuff_in_hw;
 326         }
 327         if (unlikely(skb_header_cloned(skb))) {
 328                 /* TX buffer header has been cloned */
 329                 goto dont_put_skbuff_in_hw;
 330         }
 331         if (unlikely(skb->destructor)) {
 332                 /* TX buffer has a destructor */
 333                 goto dont_put_skbuff_in_hw;
 334         }
 335         if (unlikely(skb_shinfo(skb)->nr_frags)) {
 336                 /* TX buffer has fragments */
 337                 goto dont_put_skbuff_in_hw;
 338         }
 339         if (unlikely
 340             (skb->truesize !=
 341              sizeof(*skb) + skb_end_offset(skb))) {
 342                 /* TX buffer truesize has been changed */
 343                 goto dont_put_skbuff_in_hw;
 344         }
 345
 346         /*
 347          * We can use this buffer in the FPA.  We don't need the FAU
 348          * update anymore
 349          */
 350         pko_command.s.dontfree = 0;
 351
 352         hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
 353                            ((unsigned long)fpa_head >> 7);
 354
 355         *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
 356
 357         /*
 358          * The skbuff will be reused without ever being freed. We must
 359          * cleanup a bunch of core things.
 360          */
 361         dst_release(skb_dst(skb));
 362         skb_dst_set(skb, NULL);
 363 #ifdef CONFIG_XFRM
 364         secpath_put(skb->sp);
 365         skb->sp = NULL;
 366 #endif
 367         nf_reset(skb);
 368
 369 #ifdef CONFIG_NET_SCHED
 370         skb->tc_index = 0;
 371 #ifdef CONFIG_NET_CLS_ACT
 372         skb->tc_verd = 0;
 373 #endif /* CONFIG_NET_CLS_ACT */
 374 #endif /* CONFIG_NET_SCHED */
 375 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
 376
 377 dont_put_skbuff_in_hw:
 378
 379         /* Check if we can use the hardware checksumming */
 380         if ((skb->protocol == htons(ETH_P_IP)) &&
 381             (ip_hdr(skb)->version == 4) &&
 382             (ip_hdr(skb)->ihl == 5) &&
 383             ((ip_hdr(skb)->frag_off == 0) ||
 384              (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
 385             ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 386              (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
 387                 /* Use hardware checksum calc */
 388                 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
 389         }
 390
 391         if (USE_ASYNC_IOBDMA) {
 392                 /* Get the number of skbuffs in use by the hardware */
 393                 CVMX_SYNCIOBDMA;
 394                 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 395                 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 396         } else {
 397                 /* Get the number of skbuffs in use by the hardware */
 398                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 399                                                        MAX_SKB_TO_FREE);
 400                 buffers_to_free =
 401                     cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
 402         }
 403
 404         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 405                                                 priv->fau + qos * 4);
 406
 407         /*
 408          * If we're sending faster than the receive can free them then
 409          * don't do the HW free.
 410          */
 411         if ((buffers_to_free < -100) && !pko_command.s.dontfree)
 412                 pko_command.s.dontfree = 1;
 413
 414         if (pko_command.s.dontfree) {
 415                 queue_type = QUEUE_CORE;
 416                 pko_command.s.reg0 = priv->fau + qos * 4;
 417         } else {
 418                 queue_type = QUEUE_HW;
 419         }
 420         if (USE_ASYNC_IOBDMA)
 421                 cvmx_fau_async_fetch_and_add32(
 422                                 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
 423
 424         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 425
 426         /* Drop this packet if we have too many already queued to the HW */
 427         if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
 428                      MAX_OUT_QUEUE_DEPTH)) {
 429                 if (dev->tx_queue_len != 0) {
 430                         /* Drop the lock when notifying the core.  */
 431                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 432                                                flags);
 433                         netif_stop_queue(dev);
 434                         spin_lock_irqsave(&priv->tx_free_list[qos].lock,
 435                                           flags);
 436                 } else {
 437                         /* If not using normal queueing.  */
 438                         queue_type = QUEUE_DROP;
 439                         goto skip_xmit;
 440                 }
 441         }
 442
 443         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 444                                      CVMX_PKO_LOCK_NONE);
 445
 446         /* Send the packet to the output queue */
 447         if (unlikely(cvmx_pko_send_packet_finish(priv->port,
 448                                                  priv->queue + qos,
 449                                                  pko_command, hw_buffer,
 450                                                  CVMX_PKO_LOCK_NONE))) {
 451                 printk_ratelimited("%s: Failed to send the packet\n",
 452                                    dev->name);
 453                 queue_type = QUEUE_DROP;
 454         }
 455 skip_xmit:
 456         to_free_list = NULL;
 457
 458         switch (queue_type) {
 459         case QUEUE_DROP:
 460                 skb->next = to_free_list;
 461                 to_free_list = skb;
 462                 priv->stats.tx_dropped++;
 463                 break;
 464         case QUEUE_HW:
 465                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
 466                 break;
 467         case QUEUE_CORE:
 468                 __skb_queue_tail(&priv->tx_free_list[qos], skb);
 469                 break;
 470         default:
 471                 BUG();
 472         }
 473
 474         while (skb_to_free > 0) {
 475                 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
 476
 477                 t->next = to_free_list;
 478                 to_free_list = t;
 479                 skb_to_free--;
 480         }
 481
 482         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 483
 484         /* Do the actual freeing outside of the lock. */
 485         while (to_free_list) {
 486                 struct sk_buff *t = to_free_list;
 487
 488                 to_free_list = to_free_list->next;
 489                 dev_kfree_skb_any(t);
 490         }
 491
 492         if (USE_ASYNC_IOBDMA) {
 493                 CVMX_SYNCIOBDMA;
 494                 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 495                 /* Restore the scratch area */
 496                 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 497                 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
 498         } else {
 499                 total_to_clean = cvmx_fau_fetch_and_add32(
 500                                                 FAU_TOTAL_TX_TO_CLEAN, 1);
 501         }
 502
 503         if (total_to_clean & 0x3ff) {
 504                 /*
 505                  * Schedule the cleanup tasklet every 1024 packets for
 506                  * the pathological case of high traffic on one port
 507                  * delaying clean up of packets on a different port
 508                  * that is blocked waiting for the cleanup.
 509                  */
 510                 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 511         }
 512
 513         cvm_oct_kick_tx_poll_watchdog();
 514
 515         return NETDEV_TX_OK;
 516 }
 517
 518 /**
 519  * cvm_oct_xmit_pow - transmit a packet to the POW
 520  * @skb:    Packet to send
 521  * @dev:    Device info structure
 522
 523  * Returns Always returns zero
 524  */
 525 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
 526 {
 527         struct octeon_ethernet *priv = netdev_priv(dev);
 528         void *packet_buffer;
 529         void *copy_location;
 530
 531         /* Get a work queue entry */
 532         cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
 533
 534         if (unlikely(!work)) {
 535                 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
 536                                    dev->name);
 537                 priv->stats.tx_dropped++;
 538                 dev_kfree_skb_any(skb);
 539                 return 0;
 540         }
 541
 542         /* Get a packet buffer */
 543         packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
 544         if (unlikely(!packet_buffer)) {
 545                 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
 546                                    dev->name);
 547                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
 548                 priv->stats.tx_dropped++;
 549                 dev_kfree_skb_any(skb);
 550                 return 0;
 551         }
 552
 553         /*
 554          * Calculate where we need to copy the data to. We need to
 555          * leave 8 bytes for a next pointer (unused). We also need to
 556          * include any configure skip. Then we need to align the IP
 557          * packet src and dest into the same 64bit word. The below
 558          * calculation may add a little extra, but that doesn't
 559          * hurt.
 560          */
 561         copy_location = packet_buffer + sizeof(u64);
 562         copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
 563
 564         /*
 565          * We have to copy the packet since whoever processes this
 566          * packet will free it to a hardware pool. We can't use the
 567          * trick of counting outstanding packets like in
 568          * cvm_oct_xmit.
 569          */
 570         memcpy(copy_location, skb->data, skb->len);
 571
 572         /*
 573          * Fill in some of the work queue fields. We may need to add
 574          * more if the software at the other end needs them.
 575          */
 576         if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
 577                 work->word0.pip.cn38xx.hw_chksum = skb->csum;
 578         work->word1.len = skb->len;
 579         cvmx_wqe_set_port(work, priv->port);
 580         cvmx_wqe_set_qos(work, priv->port & 0x7);
 581         cvmx_wqe_set_grp(work, pow_send_group);
 582         work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
 583         work->word1.tag = pow_send_group;       /* FIXME */
 584         /* Default to zero. Sets of zero later are commented out */
 585         work->word2.u64 = 0;
 586         work->word2.s.bufs = 1;
 587         work->packet_ptr.u64 = 0;
 588         work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
 589         work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
 590         work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 591         work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
 592
 593         if (skb->protocol == htons(ETH_P_IP)) {
 594                 work->word2.s.ip_offset = 14;
 595 #if 0
 596                 work->word2.s.vlan_valid = 0;   /* FIXME */
 597                 work->word2.s.vlan_cfi = 0;     /* FIXME */
 598                 work->word2.s.vlan_id = 0;      /* FIXME */
 599                 work->word2.s.dec_ipcomp = 0;   /* FIXME */
 600 #endif
 601                 work->word2.s.tcp_or_udp =
 602                     (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 603                     (ip_hdr(skb)->protocol == IPPROTO_UDP);
 604 #if 0
 605                 /* FIXME */
 606                 work->word2.s.dec_ipsec = 0;
 607                 /* We only support IPv4 right now */
 608                 work->word2.s.is_v6 = 0;
 609                 /* Hardware would set to zero */
 610                 work->word2.s.software = 0;
 611                 /* No error, packet is internal */
 612                 work->word2.s.L4_error = 0;
 613 #endif
 614                 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
 615                                           (ip_hdr(skb)->frag_off ==
 616                                               1 << 14));
 617 #if 0
 618                 /* Assume Linux is sending a good packet */
 619                 work->word2.s.IP_exc = 0;
 620 #endif
 621                 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
 622                 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
 623 #if 0
 624                 /* This is an IP packet */
 625                 work->word2.s.not_IP = 0;
 626                 /* No error, packet is internal */
 627                 work->word2.s.rcv_error = 0;
 628                 /* No error, packet is internal */
 629                 work->word2.s.err_code = 0;
 630 #endif
 631
 632                 /*
 633                  * When copying the data, include 4 bytes of the
 634                  * ethernet header to align the same way hardware
 635                  * does.
 636                  */
 637                 memcpy(work->packet_data, skb->data + 10,
 638                        sizeof(work->packet_data));
 639         } else {
 640 #if 0
 641                 work->word2.snoip.vlan_valid = 0;       /* FIXME */
 642                 work->word2.snoip.vlan_cfi = 0; /* FIXME */
 643                 work->word2.snoip.vlan_id = 0;  /* FIXME */
 644                 work->word2.snoip.software = 0; /* Hardware would set to zero */
 645 #endif
 646                 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
 647                 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
 648                 work->word2.snoip.is_bcast =
 649                     (skb->pkt_type == PACKET_BROADCAST);
 650                 work->word2.snoip.is_mcast =
 651                     (skb->pkt_type == PACKET_MULTICAST);
 652                 work->word2.snoip.not_IP = 1;   /* IP was done up above */
 653 #if 0
 654                 /* No error, packet is internal */
 655                 work->word2.snoip.rcv_error = 0;
 656                 /* No error, packet is internal */
 657                 work->word2.snoip.err_code = 0;
 658 #endif
 659                 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
 660         }
 661
 662         /* Submit the packet to the POW */
 663         cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
 664                              cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
 665         priv->stats.tx_packets++;
 666         priv->stats.tx_bytes += skb->len;
 667         dev_consume_skb_any(skb);
 668         return 0;
 669 }
 670
 671 /**
 672  * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
 673  * @dev:    Device being shutdown
 674  *
 675  */
 676 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
 677 {
 678         struct octeon_ethernet *priv = netdev_priv(dev);
 679         unsigned long flags;
 680         int qos;
 681
 682         for (qos = 0; qos < 16; qos++) {
 683                 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 684                 while (skb_queue_len(&priv->tx_free_list[qos]))
 685                         dev_kfree_skb_any(__skb_dequeue
 686                                           (&priv->tx_free_list[qos]));
 687                 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 688         }
 689 }
 690
 691 static void cvm_oct_tx_do_cleanup(unsigned long arg)
 692 {
 693         int port;
 694
 695         for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
 696                 if (cvm_oct_device[port]) {
 697                         struct net_device *dev = cvm_oct_device[port];
 698
 699                         cvm_oct_free_tx_skbs(dev);
 700                 }
 701         }
 702 }
 703
 704 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
 705 {
 706         /* Disable the interrupt.  */
 707         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 708         /* Do the work in the tasklet.  */
 709         tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 710         return IRQ_HANDLED;
 711 }
 712
 713 void cvm_oct_tx_initialize(void)
 714 {
 715         int i;
 716
 717         /* Disable the interrupt.  */
 718         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 719         /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
 720         i = request_irq(OCTEON_IRQ_TIMER1,
 721                         cvm_oct_tx_cleanup_watchdog, 0,
 722                         "Ethernet", cvm_oct_device);
 723
 724         if (i)
 725                 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
 726 }
 727
 728 void cvm_oct_tx_shutdown(void)
 729 {
 730         /* Free the interrupt handler */
 731         free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
 732 }