drivers/staging/octeon/ethernet-tx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file is based on code from OCTEON SDK by Cavium Networks.
   4  *
   5  * Copyright (c) 2003-2010 Cavium Networks
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ip.h>
  13 #include <linux/ratelimit.h>
  14 #include <linux/string.h>
  15 #include <linux/interrupt.h>
  16 #include <net/dst.h>
  17 #ifdef CONFIG_XFRM
  18 #include <linux/xfrm.h>
  19 #include <net/xfrm.h>
  20 #endif /* CONFIG_XFRM */
  21
  22 #include <linux/atomic.h>
  23 #include <net/sch_generic.h>
  24
  25 #include "octeon-ethernet.h"
  26 #include "ethernet-defines.h"
  27 #include "ethernet-tx.h"
  28 #include "ethernet-util.h"
  29
  30 #define CVM_OCT_SKB_CB(skb)     ((u64 *)((skb)->cb))
  31
  32 /*
  33  * You can define GET_SKBUFF_QOS() to override how the skbuff output
  34  * function determines which output queue is used. The default
  35  * implementation always uses the base queue for the port. If, for
  36  * example, you wanted to use the skb->priority field, define
  37  * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
  38  */
  39 #ifndef GET_SKBUFF_QOS
  40 #define GET_SKBUFF_QOS(skb) 0
  41 #endif
  42
  43 static void cvm_oct_tx_do_cleanup(unsigned long arg);
  44 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
  45
  46 /* Maximum number of SKBs to try to free per xmit packet. */
  47 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
  48
  49 static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
  50 {
  51         int undo;
  52
  53         undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
  54                                                    MAX_SKB_TO_FREE;
  55         if (undo > 0)
  56                 cvmx_fau_atomic_add32(fau, -undo);
  57         skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
  58                                                        -skb_to_free;
  59         return skb_to_free;
  60 }
  61
  62 static void cvm_oct_kick_tx_poll_watchdog(void)
  63 {
  64         union cvmx_ciu_timx ciu_timx;
  65
  66         ciu_timx.u64 = 0;
  67         ciu_timx.s.one_shot = 1;
  68         ciu_timx.s.len = cvm_oct_tx_poll_interval;
  69         cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
  70 }
  71
  72 static void cvm_oct_free_tx_skbs(struct net_device *dev)
  73 {
  74         int skb_to_free;
  75         int qos, queues_per_port;
  76         int total_freed = 0;
  77         int total_remaining = 0;
  78         unsigned long flags;
  79         struct octeon_ethernet *priv = netdev_priv(dev);
  80
  81         queues_per_port = cvmx_pko_get_num_queues(priv->port);
  82         /* Drain any pending packets in the free list */
  83         for (qos = 0; qos < queues_per_port; qos++) {
  84                 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
  85                         continue;
  86                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
  87                                                        MAX_SKB_TO_FREE);
  88                 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
  89                                                          priv->fau + qos * 4);
  90                 total_freed += skb_to_free;
  91                 if (skb_to_free > 0) {
  92                         struct sk_buff *to_free_list = NULL;
  93
  94                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
  95                         while (skb_to_free > 0) {
  96                                 struct sk_buff *t;
  97
  98                                 t = __skb_dequeue(&priv->tx_free_list[qos]);
  99                                 t->next = to_free_list;
 100                                 to_free_list = t;
 101                                 skb_to_free--;
 102                         }
 103                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 104                                                flags);
 105                         /* Do the actual freeing outside of the lock. */
 106                         while (to_free_list) {
 107                                 struct sk_buff *t = to_free_list;
 108
 109                                 to_free_list = to_free_list->next;
 110                                 dev_kfree_skb_any(t);
 111                         }
 112                 }
 113                 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
 114         }
 115         if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
 116                 netif_wake_queue(dev);
 117         if (total_remaining)
 118                 cvm_oct_kick_tx_poll_watchdog();
 119 }
 120
 121 /**
 122  * cvm_oct_xmit - transmit a packet
 123  * @skb:    Packet to send
 124  * @dev:    Device info structure
 125  *
 126  * Returns Always returns NETDEV_TX_OK
 127  */
 128 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
 129 {
 130         cvmx_pko_command_word0_t pko_command;
 131         union cvmx_buf_ptr hw_buffer;
 132         u64 old_scratch;
 133         u64 old_scratch2;
 134         int qos;
 135         int i;
 136         enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
 137         struct octeon_ethernet *priv = netdev_priv(dev);
 138         struct sk_buff *to_free_list;
 139         int skb_to_free;
 140         int buffers_to_free;
 141         u32 total_to_clean;
 142         unsigned long flags;
 143 #if REUSE_SKBUFFS_WITHOUT_FREE
 144         unsigned char *fpa_head;
 145 #endif
 146
 147         /*
 148          * Prefetch the private data structure.  It is larger than the
 149          * one cache line.
 150          */
 151         prefetch(priv);
 152
 153         /*
 154          * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
 155          * completely remove "qos" in the event neither interface
 156          * supports multiple queues per port.
 157          */
 158         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 159             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 160                 qos = GET_SKBUFF_QOS(skb);
 161                 if (qos <= 0)
 162                         qos = 0;
 163                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 164                         qos = 0;
 165         } else {
 166                 qos = 0;
 167         }
 168
 169         if (USE_ASYNC_IOBDMA) {
 170                 /* Save scratch in case userspace is using it */
 171                 CVMX_SYNCIOBDMA;
 172                 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 173                 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 174
 175                 /*
 176                  * Fetch and increment the number of packets to be
 177                  * freed.
 178                  */
 179                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
 180                                                FAU_NUM_PACKET_BUFFERS_TO_FREE,
 181                                                0);
 182                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 183                                                priv->fau + qos * 4,
 184                                                MAX_SKB_TO_FREE);
 185         }
 186
 187         /*
 188          * We have space for 6 segment pointers, If there will be more
 189          * than that, we must linearize.
 190          */
 191         if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
 192                 if (unlikely(__skb_linearize(skb))) {
 193                         queue_type = QUEUE_DROP;
 194                         if (USE_ASYNC_IOBDMA) {
 195                                 /*
 196                                  * Get the number of skbuffs in use
 197                                  * by the hardware
 198                                  */
 199                                 CVMX_SYNCIOBDMA;
 200                                 skb_to_free =
 201                                         cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 202                         } else {
 203                                 /*
 204                                  * Get the number of skbuffs in use
 205                                  * by the hardware
 206                                  */
 207                                 skb_to_free =
 208                                      cvmx_fau_fetch_and_add32(priv->fau +
 209                                                               qos * 4,
 210                                                               MAX_SKB_TO_FREE);
 211                         }
 212                         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 213                                                                  priv->fau +
 214                                                                  qos * 4);
 215                         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 216                         goto skip_xmit;
 217                 }
 218         }
 219
 220         /*
 221          * The CN3XXX series of parts has an errata (GMX-401) which
 222          * causes the GMX block to hang if a collision occurs towards
 223          * the end of a <68 byte packet. As a workaround for this, we
 224          * pad packets to be 68 bytes whenever we are in half duplex
 225          * mode. We don't handle the case of having a small packet but
 226          * no room to add the padding.  The kernel should always give
 227          * us at least a cache line
 228          */
 229         if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 230                 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
 231                 int interface = INTERFACE(priv->port);
 232                 int index = INDEX(priv->port);
 233
 234                 if (interface < 2) {
 235                         /* We only need to pad packet in half duplex mode */
 236                         gmx_prt_cfg.u64 =
 237                             cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 238                         if (gmx_prt_cfg.s.duplex == 0) {
 239                                 int add_bytes = 64 - skb->len;
 240
 241                                 if ((skb_tail_pointer(skb) + add_bytes) <=
 242                                     skb_end_pointer(skb))
 243                                         __skb_put_zero(skb, add_bytes);
 244                         }
 245                 }
 246         }
 247
 248         /* Build the PKO command */
 249         pko_command.u64 = 0;
 250 #ifdef __LITTLE_ENDIAN
 251         pko_command.s.le = 1;
 252 #endif
 253         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 254         pko_command.s.segs = 1;
 255         pko_command.s.total_bytes = skb->len;
 256         pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
 257         pko_command.s.subone0 = 1;
 258
 259         pko_command.s.dontfree = 1;
 260
 261         /* Build the PKO buffer pointer */
 262         hw_buffer.u64 = 0;
 263         if (skb_shinfo(skb)->nr_frags == 0) {
 264                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
 265                 hw_buffer.s.pool = 0;
 266                 hw_buffer.s.size = skb->len;
 267         } else {
 268                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
 269                 hw_buffer.s.pool = 0;
 270                 hw_buffer.s.size = skb_headlen(skb);
 271                 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
 272                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 273                         skb_frag_t *fs = skb_shinfo(skb)->frags + i;
 274
 275                         hw_buffer.s.addr =
 276                                 XKPHYS_TO_PHYS((u64)skb_frag_address(fs));
 277                         hw_buffer.s.size = skb_frag_size(fs);
 278                         CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
 279                 }
 280                 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
 281                 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
 282                 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
 283                 pko_command.s.gather = 1;
 284                 goto dont_put_skbuff_in_hw;
 285         }
 286
 287         /*
 288          * See if we can put this skb in the FPA pool. Any strange
 289          * behavior from the Linux networking stack will most likely
 290          * be caused by a bug in the following code. If some field is
 291          * in use by the network stack and gets carried over when a
 292          * buffer is reused, bad things may happen.  If in doubt and
 293          * you dont need the absolute best performance, disable the
 294          * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
 295          * shown a 25% increase in performance under some loads.
 296          */
 297 #if REUSE_SKBUFFS_WITHOUT_FREE
 298         fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
 299         if (unlikely(skb->data < fpa_head)) {
 300                 /* TX buffer beginning can't meet FPA alignment constraints */
 301                 goto dont_put_skbuff_in_hw;
 302         }
 303         if (unlikely
 304             ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
 305                 /* TX buffer isn't large enough for the FPA */
 306                 goto dont_put_skbuff_in_hw;
 307         }
 308         if (unlikely(skb_shared(skb))) {
 309                 /* TX buffer sharing data with someone else */
 310                 goto dont_put_skbuff_in_hw;
 311         }
 312         if (unlikely(skb_cloned(skb))) {
 313                 /* TX buffer has been cloned */
 314                 goto dont_put_skbuff_in_hw;
 315         }
 316         if (unlikely(skb_header_cloned(skb))) {
 317                 /* TX buffer header has been cloned */
 318                 goto dont_put_skbuff_in_hw;
 319         }
 320         if (unlikely(skb->destructor)) {
 321                 /* TX buffer has a destructor */
 322                 goto dont_put_skbuff_in_hw;
 323         }
 324         if (unlikely(skb_shinfo(skb)->nr_frags)) {
 325                 /* TX buffer has fragments */
 326                 goto dont_put_skbuff_in_hw;
 327         }
 328         if (unlikely
 329             (skb->truesize !=
 330              sizeof(*skb) + skb_end_offset(skb))) {
 331                 /* TX buffer truesize has been changed */
 332                 goto dont_put_skbuff_in_hw;
 333         }
 334
 335         /*
 336          * We can use this buffer in the FPA.  We don't need the FAU
 337          * update anymore
 338          */
 339         pko_command.s.dontfree = 0;
 340
 341         hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
 342                            ((unsigned long)fpa_head >> 7);
 343
 344         *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
 345
 346         /*
 347          * The skbuff will be reused without ever being freed. We must
 348          * cleanup a bunch of core things.
 349          */
 350         dst_release(skb_dst(skb));
 351         skb_dst_set(skb, NULL);
 352 #ifdef CONFIG_XFRM
 353         secpath_reset(skb);
 354 #endif
 355         nf_reset(skb);
 356
 357 #ifdef CONFIG_NET_SCHED
 358         skb->tc_index = 0;
 359         skb_reset_tc(skb);
 360 #endif /* CONFIG_NET_SCHED */
 361 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
 362
 363 dont_put_skbuff_in_hw:
 364
 365         /* Check if we can use the hardware checksumming */
 366         if ((skb->protocol == htons(ETH_P_IP)) &&
 367             (ip_hdr(skb)->version == 4) &&
 368             (ip_hdr(skb)->ihl == 5) &&
 369             ((ip_hdr(skb)->frag_off == 0) ||
 370              (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
 371             ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 372              (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
 373                 /* Use hardware checksum calc */
 374                 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
 375         }
 376
 377         if (USE_ASYNC_IOBDMA) {
 378                 /* Get the number of skbuffs in use by the hardware */
 379                 CVMX_SYNCIOBDMA;
 380                 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 381                 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 382         } else {
 383                 /* Get the number of skbuffs in use by the hardware */
 384                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 385                                                        MAX_SKB_TO_FREE);
 386                 buffers_to_free =
 387                     cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
 388         }
 389
 390         skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 391                                                  priv->fau + qos * 4);
 392
 393         /*
 394          * If we're sending faster than the receive can free them then
 395          * don't do the HW free.
 396          */
 397         if ((buffers_to_free < -100) && !pko_command.s.dontfree)
 398                 pko_command.s.dontfree = 1;
 399
 400         if (pko_command.s.dontfree) {
 401                 queue_type = QUEUE_CORE;
 402                 pko_command.s.reg0 = priv->fau + qos * 4;
 403         } else {
 404                 queue_type = QUEUE_HW;
 405         }
 406         if (USE_ASYNC_IOBDMA)
 407                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 408                                                FAU_TOTAL_TX_TO_CLEAN, 1);
 409
 410         spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 411
 412         /* Drop this packet if we have too many already queued to the HW */
 413         if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
 414                      MAX_OUT_QUEUE_DEPTH)) {
 415                 if (dev->tx_queue_len != 0) {
 416                         /* Drop the lock when notifying the core.  */
 417                         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
 418                                                flags);
 419                         netif_stop_queue(dev);
 420                         spin_lock_irqsave(&priv->tx_free_list[qos].lock,
 421                                           flags);
 422                 } else {
 423                         /* If not using normal queueing.  */
 424                         queue_type = QUEUE_DROP;
 425                         goto skip_xmit;
 426                 }
 427         }
 428
 429         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 430                                      CVMX_PKO_LOCK_NONE);
 431
 432         /* Send the packet to the output queue */
 433         if (unlikely(cvmx_pko_send_packet_finish(priv->port,
 434                                                  priv->queue + qos,
 435                                                  pko_command, hw_buffer,
 436                                                  CVMX_PKO_LOCK_NONE))) {
 437                 printk_ratelimited("%s: Failed to send the packet\n",
 438                                    dev->name);
 439                 queue_type = QUEUE_DROP;
 440         }
 441 skip_xmit:
 442         to_free_list = NULL;
 443
 444         switch (queue_type) {
 445         case QUEUE_DROP:
 446                 skb->next = to_free_list;
 447                 to_free_list = skb;
 448                 dev->stats.tx_dropped++;
 449                 break;
 450         case QUEUE_HW:
 451                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
 452                 break;
 453         case QUEUE_CORE:
 454                 __skb_queue_tail(&priv->tx_free_list[qos], skb);
 455                 break;
 456         default:
 457                 BUG();
 458         }
 459
 460         while (skb_to_free > 0) {
 461                 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
 462
 463                 t->next = to_free_list;
 464                 to_free_list = t;
 465                 skb_to_free--;
 466         }
 467
 468         spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 469
 470         /* Do the actual freeing outside of the lock. */
 471         while (to_free_list) {
 472                 struct sk_buff *t = to_free_list;
 473
 474                 to_free_list = to_free_list->next;
 475                 dev_kfree_skb_any(t);
 476         }
 477
 478         if (USE_ASYNC_IOBDMA) {
 479                 CVMX_SYNCIOBDMA;
 480                 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 481                 /* Restore the scratch area */
 482                 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 483                 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
 484         } else {
 485                 total_to_clean =
 486                         cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
 487         }
 488
 489         if (total_to_clean & 0x3ff) {
 490                 /*
 491                  * Schedule the cleanup tasklet every 1024 packets for
 492                  * the pathological case of high traffic on one port
 493                  * delaying clean up of packets on a different port
 494                  * that is blocked waiting for the cleanup.
 495                  */
 496                 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 497         }
 498
 499         cvm_oct_kick_tx_poll_watchdog();
 500
 501         return NETDEV_TX_OK;
 502 }
 503
 504 /**
 505  * cvm_oct_xmit_pow - transmit a packet to the POW
 506  * @skb:    Packet to send
 507  * @dev:    Device info structure
 508
 509  * Returns Always returns zero
 510  */
 511 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
 512 {
 513         struct octeon_ethernet *priv = netdev_priv(dev);
 514         void *packet_buffer;
 515         void *copy_location;
 516
 517         /* Get a work queue entry */
 518         cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
 519
 520         if (unlikely(!work)) {
 521                 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
 522                                    dev->name);
 523                 dev->stats.tx_dropped++;
 524                 dev_kfree_skb_any(skb);
 525                 return 0;
 526         }
 527
 528         /* Get a packet buffer */
 529         packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
 530         if (unlikely(!packet_buffer)) {
 531                 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
 532                                    dev->name);
 533                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
 534                 dev->stats.tx_dropped++;
 535                 dev_kfree_skb_any(skb);
 536                 return 0;
 537         }
 538
 539         /*
 540          * Calculate where we need to copy the data to. We need to
 541          * leave 8 bytes for a next pointer (unused). We also need to
 542          * include any configure skip. Then we need to align the IP
 543          * packet src and dest into the same 64bit word. The below
 544          * calculation may add a little extra, but that doesn't
 545          * hurt.
 546          */
 547         copy_location = packet_buffer + sizeof(u64);
 548         copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
 549
 550         /*
 551          * We have to copy the packet since whoever processes this
 552          * packet will free it to a hardware pool. We can't use the
 553          * trick of counting outstanding packets like in
 554          * cvm_oct_xmit.
 555          */
 556         memcpy(copy_location, skb->data, skb->len);
 557
 558         /*
 559          * Fill in some of the work queue fields. We may need to add
 560          * more if the software at the other end needs them.
 561          */
 562         if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
 563                 work->word0.pip.cn38xx.hw_chksum = skb->csum;
 564         work->word1.len = skb->len;
 565         cvmx_wqe_set_port(work, priv->port);
 566         cvmx_wqe_set_qos(work, priv->port & 0x7);
 567         cvmx_wqe_set_grp(work, pow_send_group);
 568         work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
 569         work->word1.tag = pow_send_group;       /* FIXME */
 570         /* Default to zero. Sets of zero later are commented out */
 571         work->word2.u64 = 0;
 572         work->word2.s.bufs = 1;
 573         work->packet_ptr.u64 = 0;
 574         work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
 575         work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
 576         work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 577         work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
 578
 579         if (skb->protocol == htons(ETH_P_IP)) {
 580                 work->word2.s.ip_offset = 14;
 581 #if 0
 582                 work->word2.s.vlan_valid = 0;   /* FIXME */
 583                 work->word2.s.vlan_cfi = 0;     /* FIXME */
 584                 work->word2.s.vlan_id = 0;      /* FIXME */
 585                 work->word2.s.dec_ipcomp = 0;   /* FIXME */
 586 #endif
 587                 work->word2.s.tcp_or_udp =
 588                     (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
 589                     (ip_hdr(skb)->protocol == IPPROTO_UDP);
 590 #if 0
 591                 /* FIXME */
 592                 work->word2.s.dec_ipsec = 0;
 593                 /* We only support IPv4 right now */
 594                 work->word2.s.is_v6 = 0;
 595                 /* Hardware would set to zero */
 596                 work->word2.s.software = 0;
 597                 /* No error, packet is internal */
 598                 work->word2.s.L4_error = 0;
 599 #endif
 600                 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
 601                                           (ip_hdr(skb)->frag_off ==
 602                                               1 << 14));
 603 #if 0
 604                 /* Assume Linux is sending a good packet */
 605                 work->word2.s.IP_exc = 0;
 606 #endif
 607                 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
 608                 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
 609 #if 0
 610                 /* This is an IP packet */
 611                 work->word2.s.not_IP = 0;
 612                 /* No error, packet is internal */
 613                 work->word2.s.rcv_error = 0;
 614                 /* No error, packet is internal */
 615                 work->word2.s.err_code = 0;
 616 #endif
 617
 618                 /*
 619                  * When copying the data, include 4 bytes of the
 620                  * ethernet header to align the same way hardware
 621                  * does.
 622                  */
 623                 memcpy(work->packet_data, skb->data + 10,
 624                        sizeof(work->packet_data));
 625         } else {
 626 #if 0
 627                 work->word2.snoip.vlan_valid = 0;       /* FIXME */
 628                 work->word2.snoip.vlan_cfi = 0; /* FIXME */
 629                 work->word2.snoip.vlan_id = 0;  /* FIXME */
 630                 work->word2.snoip.software = 0; /* Hardware would set to zero */
 631 #endif
 632                 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
 633                 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
 634                 work->word2.snoip.is_bcast =
 635                     (skb->pkt_type == PACKET_BROADCAST);
 636                 work->word2.snoip.is_mcast =
 637                     (skb->pkt_type == PACKET_MULTICAST);
 638                 work->word2.snoip.not_IP = 1;   /* IP was done up above */
 639 #if 0
 640                 /* No error, packet is internal */
 641                 work->word2.snoip.rcv_error = 0;
 642                 /* No error, packet is internal */
 643                 work->word2.snoip.err_code = 0;
 644 #endif
 645                 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
 646         }
 647
 648         /* Submit the packet to the POW */
 649         cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
 650                              cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
 651         dev->stats.tx_packets++;
 652         dev->stats.tx_bytes += skb->len;
 653         dev_consume_skb_any(skb);
 654         return 0;
 655 }
 656
 657 /**
 658  * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
 659  * @dev:    Device being shutdown
 660  *
 661  */
 662 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
 663 {
 664         struct octeon_ethernet *priv = netdev_priv(dev);
 665         unsigned long flags;
 666         int qos;
 667
 668         for (qos = 0; qos < 16; qos++) {
 669                 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 670                 while (skb_queue_len(&priv->tx_free_list[qos]))
 671                         dev_kfree_skb_any(__skb_dequeue
 672                                           (&priv->tx_free_list[qos]));
 673                 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 674         }
 675 }
 676
 677 static void cvm_oct_tx_do_cleanup(unsigned long arg)
 678 {
 679         int port;
 680
 681         for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
 682                 if (cvm_oct_device[port]) {
 683                         struct net_device *dev = cvm_oct_device[port];
 684
 685                         cvm_oct_free_tx_skbs(dev);
 686                 }
 687         }
 688 }
 689
 690 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
 691 {
 692         /* Disable the interrupt.  */
 693         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 694         /* Do the work in the tasklet.  */
 695         tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
 696         return IRQ_HANDLED;
 697 }
 698
 699 void cvm_oct_tx_initialize(void)
 700 {
 701         int i;
 702
 703         /* Disable the interrupt.  */
 704         cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
 705         /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
 706         i = request_irq(OCTEON_IRQ_TIMER1,
 707                         cvm_oct_tx_cleanup_watchdog, 0,
 708                         "Ethernet", cvm_oct_device);
 709
 710         if (i)
 711                 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
 712 }
 713
 714 void cvm_oct_tx_shutdown(void)
 715 {
 716         /* Free the interrupt handler */
 717         free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
 718 }