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