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   1 /*********************************************************************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2007 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26 *********************************************************************/
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/init.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ip.h>
  33 #include <linux/string.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/mii.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/proc_fs.h>
  38 #include <net/dst.h>
  39 #ifdef CONFIG_XFRM
  40 #include <linux/xfrm.h>
  41 #include <net/xfrm.h>
  42 #endif /* CONFIG_XFRM */
  43
  44 #include <asm/atomic.h>
  45
  46 #include <asm/octeon/octeon.h>
  47
  48 #include "ethernet-defines.h"
  49 #include "octeon-ethernet.h"
  50 #include "ethernet-tx.h"
  51 #include "ethernet-util.h"
  52
  53 #include "cvmx-wqe.h"
  54 #include "cvmx-fau.h"
  55 #include "cvmx-pko.h"
  56 #include "cvmx-helper.h"
  57
  58 #include "cvmx-gmxx-defs.h"
  59
  60 /*
  61  * You can define GET_SKBUFF_QOS() to override how the skbuff output
  62  * function determines which output queue is used. The default
  63  * implementation always uses the base queue for the port. If, for
  64  * example, you wanted to use the skb->priority fieid, define
  65  * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
  66  */
  67 #ifndef GET_SKBUFF_QOS
  68 #define GET_SKBUFF_QOS(skb) 0
  69 #endif
  70
  71 /**
  72  * Packet transmit
  73  *
  74  * @skb:    Packet to send
  75  * @dev:    Device info structure
  76  * Returns Always returns zero
  77  */
  78 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
  79 {
  80         cvmx_pko_command_word0_t pko_command;
  81         union cvmx_buf_ptr hw_buffer;
  82         uint64_t old_scratch;
  83         uint64_t old_scratch2;
  84         int dropped;
  85         int qos;
  86         int queue_it_up;
  87         struct octeon_ethernet *priv = netdev_priv(dev);
  88         int32_t skb_to_free;
  89         int32_t undo;
  90         int32_t buffers_to_free;
  91 #if REUSE_SKBUFFS_WITHOUT_FREE
  92         unsigned char *fpa_head;
  93 #endif
  94
  95         /*
  96          * Prefetch the private data structure.  It is larger that one
  97          * cache line.
  98          */
  99         prefetch(priv);
 100
 101         /* Start off assuming no drop */
 102         dropped = 0;
 103
 104         /*
 105          * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
 106          * completely remove "qos" in the event neither interface
 107          * supports multiple queues per port.
 108          */
 109         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 110             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 111                 qos = GET_SKBUFF_QOS(skb);
 112                 if (qos <= 0)
 113                         qos = 0;
 114                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 115                         qos = 0;
 116         } else
 117                 qos = 0;
 118
 119         if (USE_ASYNC_IOBDMA) {
 120                 /* Save scratch in case userspace is using it */
 121                 CVMX_SYNCIOBDMA;
 122                 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 123                 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 124
 125                 /*
 126                  * Fetch and increment the number of packets to be
 127                  * freed.
 128                  */
 129                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
 130                                                FAU_NUM_PACKET_BUFFERS_TO_FREE,
 131                                                0);
 132                 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
 133                                                priv->fau + qos * 4,
 134                                                MAX_SKB_TO_FREE);
 135         }
 136
 137         /*
 138          * The CN3XXX series of parts has an errata (GMX-401) which
 139          * causes the GMX block to hang if a collision occurs towards
 140          * the end of a <68 byte packet. As a workaround for this, we
 141          * pad packets to be 68 bytes whenever we are in half duplex
 142          * mode. We don't handle the case of having a small packet but
 143          * no room to add the padding.  The kernel should always give
 144          * us at least a cache line
 145          */
 146         if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 147                 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
 148                 int interface = INTERFACE(priv->port);
 149                 int index = INDEX(priv->port);
 150
 151                 if (interface < 2) {
 152                         /* We only need to pad packet in half duplex mode */
 153                         gmx_prt_cfg.u64 =
 154                             cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 155                         if (gmx_prt_cfg.s.duplex == 0) {
 156                                 int add_bytes = 64 - skb->len;
 157                                 if ((skb_tail_pointer(skb) + add_bytes) <=
 158                                     skb_end_pointer(skb))
 159                                         memset(__skb_put(skb, add_bytes), 0,
 160                                                add_bytes);
 161                         }
 162                 }
 163         }
 164
 165         /* Build the PKO buffer pointer */
 166         hw_buffer.u64 = 0;
 167         hw_buffer.s.addr = cvmx_ptr_to_phys(skb->data);
 168         hw_buffer.s.pool = 0;
 169         hw_buffer.s.size =
 170             (unsigned long)skb_end_pointer(skb) - (unsigned long)skb->head;
 171
 172         /* Build the PKO command */
 173         pko_command.u64 = 0;
 174         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 175         pko_command.s.segs = 1;
 176         pko_command.s.total_bytes = skb->len;
 177         pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
 178         pko_command.s.subone0 = 1;
 179
 180         pko_command.s.dontfree = 1;
 181         pko_command.s.reg0 = priv->fau + qos * 4;
 182         /*
 183          * See if we can put this skb in the FPA pool. Any strange
 184          * behavior from the Linux networking stack will most likely
 185          * be caused by a bug in the following code. If some field is
 186          * in use by the network stack and get carried over when a
 187          * buffer is reused, bad thing may happen.  If in doubt and
 188          * you dont need the absolute best performance, disable the
 189          * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
 190          * shown a 25% increase in performance under some loads.
 191          */
 192 #if REUSE_SKBUFFS_WITHOUT_FREE
 193         fpa_head = skb->head + 128 - ((unsigned long)skb->head & 0x7f);
 194         if (unlikely(skb->data < fpa_head)) {
 195                 /*
 196                  * printk("TX buffer beginning can't meet FPA
 197                  * alignment constraints\n");
 198                  */
 199                 goto dont_put_skbuff_in_hw;
 200         }
 201         if (unlikely
 202             ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
 203                 /*
 204                    printk("TX buffer isn't large enough for the FPA\n");
 205                  */
 206                 goto dont_put_skbuff_in_hw;
 207         }
 208         if (unlikely(skb_shared(skb))) {
 209                 /*
 210                    printk("TX buffer sharing data with someone else\n");
 211                  */
 212                 goto dont_put_skbuff_in_hw;
 213         }
 214         if (unlikely(skb_cloned(skb))) {
 215                 /*
 216                    printk("TX buffer has been cloned\n");
 217                  */
 218                 goto dont_put_skbuff_in_hw;
 219         }
 220         if (unlikely(skb_header_cloned(skb))) {
 221                 /*
 222                    printk("TX buffer header has been cloned\n");
 223                  */
 224                 goto dont_put_skbuff_in_hw;
 225         }
 226         if (unlikely(skb->destructor)) {
 227                 /*
 228                    printk("TX buffer has a destructor\n");
 229                  */
 230                 goto dont_put_skbuff_in_hw;
 231         }
 232         if (unlikely(skb_shinfo(skb)->nr_frags)) {
 233                 /*
 234                    printk("TX buffer has fragments\n");
 235                  */
 236                 goto dont_put_skbuff_in_hw;
 237         }
 238         if (unlikely
 239             (skb->truesize !=
 240              sizeof(*skb) + skb_end_pointer(skb) - skb->head)) {
 241                 /*
 242                    printk("TX buffer truesize has been changed\n");
 243                  */
 244                 goto dont_put_skbuff_in_hw;
 245         }
 246
 247         /*
 248          * We can use this buffer in the FPA.  We don't need the FAU
 249          * update anymore
 250          */
 251         pko_command.s.reg0 = 0;
 252         pko_command.s.dontfree = 0;
 253
 254         hw_buffer.s.back = (skb->data - fpa_head) >> 7;
 255         *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
 256
 257         /*
 258          * The skbuff will be reused without ever being freed. We must
 259          * cleanup a bunch of core things.
 260          */
 261         dst_release(skb_dst(skb));
 262         skb_dst_set(skb, NULL);
 263 #ifdef CONFIG_XFRM
 264         secpath_put(skb->sp);
 265         skb->sp = NULL;
 266 #endif
 267         nf_reset(skb);
 268
 269 #ifdef CONFIG_NET_SCHED
 270         skb->tc_index = 0;
 271 #ifdef CONFIG_NET_CLS_ACT
 272         skb->tc_verd = 0;
 273 #endif /* CONFIG_NET_CLS_ACT */
 274 #endif /* CONFIG_NET_SCHED */
 275
 276 dont_put_skbuff_in_hw:
 277 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
 278
 279         /* Check if we can use the hardware checksumming */
 280         if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
 281             (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
 282             ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14))
 283             && ((ip_hdr(skb)->protocol == IP_PROTOCOL_TCP)
 284                 || (ip_hdr(skb)->protocol == IP_PROTOCOL_UDP))) {
 285                 /* Use hardware checksum calc */
 286                 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
 287         }
 288
 289         if (USE_ASYNC_IOBDMA) {
 290                 /* Get the number of skbuffs in use by the hardware */
 291                 CVMX_SYNCIOBDMA;
 292                 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 293                 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
 294         } else {
 295                 /* Get the number of skbuffs in use by the hardware */
 296                 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 297                                                        MAX_SKB_TO_FREE);
 298                 buffers_to_free =
 299                     cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
 300         }
 301
 302         /*
 303          * We try to claim MAX_SKB_TO_FREE buffers.  If there were not
 304          * that many available, we have to un-claim (undo) any that
 305          * were in excess.  If skb_to_free is positive we will free
 306          * that many buffers.
 307          */
 308         undo = skb_to_free > 0 ?
 309                 MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
 310         if (undo > 0)
 311                 cvmx_fau_atomic_add32(priv->fau+qos*4, -undo);
 312         skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ?
 313                 MAX_SKB_TO_FREE : -skb_to_free;
 314
 315         /*
 316          * If we're sending faster than the receive can free them then
 317          * don't do the HW free.
 318          */
 319         if ((buffers_to_free < -100) && !pko_command.s.dontfree) {
 320                 pko_command.s.dontfree = 1;
 321                 pko_command.s.reg0 = priv->fau + qos * 4;
 322         }
 323
 324         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 325                                      CVMX_PKO_LOCK_CMD_QUEUE);
 326
 327         /* Drop this packet if we have too many already queued to the HW */
 328         if (unlikely
 329             (skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
 330                 /*
 331                    DEBUGPRINT("%s: Tx dropped. Too many queued\n", dev->name);
 332                  */
 333                 dropped = 1;
 334         }
 335         /* Send the packet to the output queue */
 336         else if (unlikely
 337                  (cvmx_pko_send_packet_finish
 338                   (priv->port, priv->queue + qos, pko_command, hw_buffer,
 339                    CVMX_PKO_LOCK_CMD_QUEUE))) {
 340                 DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
 341                 dropped = 1;
 342         }
 343
 344         if (USE_ASYNC_IOBDMA) {
 345                 /* Restore the scratch area */
 346                 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 347                 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
 348         }
 349
 350         queue_it_up = 0;
 351         if (unlikely(dropped)) {
 352                 dev_kfree_skb_any(skb);
 353                 priv->stats.tx_dropped++;
 354         } else {
 355                 if (USE_SKBUFFS_IN_HW) {
 356                         /* Put this packet on the queue to be freed later */
 357                         if (pko_command.s.dontfree)
 358                                 queue_it_up = 1;
 359                         else
 360                                 cvmx_fau_atomic_add32
 361                                     (FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
 362                 } else {
 363                         /* Put this packet on the queue to be freed later */
 364                         queue_it_up = 1;
 365                 }
 366         }
 367
 368         if (queue_it_up) {
 369                 spin_lock(&priv->tx_free_list[qos].lock);
 370                 __skb_queue_tail(&priv->tx_free_list[qos], skb);
 371                 cvm_oct_free_tx_skbs(priv, skb_to_free, qos, 0);
 372                 spin_unlock(&priv->tx_free_list[qos].lock);
 373         } else {
 374                 cvm_oct_free_tx_skbs(priv, skb_to_free, qos, 1);
 375         }
 376
 377         return 0;
 378 }
 379
 380 /**
 381  * Packet transmit to the POW
 382  *
 383  * @skb:    Packet to send
 384  * @dev:    Device info structure
 385  * Returns Always returns zero
 386  */
 387 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
 388 {
 389         struct octeon_ethernet *priv = netdev_priv(dev);
 390         void *packet_buffer;
 391         void *copy_location;
 392
 393         /* Get a work queue entry */
 394         cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
 395         if (unlikely(work == NULL)) {
 396                 DEBUGPRINT("%s: Failed to allocate a work queue entry\n",
 397                            dev->name);
 398                 priv->stats.tx_dropped++;
 399                 dev_kfree_skb(skb);
 400                 return 0;
 401         }
 402
 403         /* Get a packet buffer */
 404         packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
 405         if (unlikely(packet_buffer == NULL)) {
 406                 DEBUGPRINT("%s: Failed to allocate a packet buffer\n",
 407                            dev->name);
 408                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
 409                 priv->stats.tx_dropped++;
 410                 dev_kfree_skb(skb);
 411                 return 0;
 412         }
 413
 414         /*
 415          * Calculate where we need to copy the data to. We need to
 416          * leave 8 bytes for a next pointer (unused). We also need to
 417          * include any configure skip. Then we need to align the IP
 418          * packet src and dest into the same 64bit word. The below
 419          * calculation may add a little extra, but that doesn't
 420          * hurt.
 421          */
 422         copy_location = packet_buffer + sizeof(uint64_t);
 423         copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
 424
 425         /*
 426          * We have to copy the packet since whoever processes this
 427          * packet will free it to a hardware pool. We can't use the
 428          * trick of counting outstanding packets like in
 429          * cvm_oct_xmit.
 430          */
 431         memcpy(copy_location, skb->data, skb->len);
 432
 433         /*
 434          * Fill in some of the work queue fields. We may need to add
 435          * more if the software at the other end needs them.
 436          */
 437         work->hw_chksum = skb->csum;
 438         work->len = skb->len;
 439         work->ipprt = priv->port;
 440         work->qos = priv->port & 0x7;
 441         work->grp = pow_send_group;
 442         work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
 443         work->tag = pow_send_group;     /* FIXME */
 444         /* Default to zero. Sets of zero later are commented out */
 445         work->word2.u64 = 0;
 446         work->word2.s.bufs = 1;
 447         work->packet_ptr.u64 = 0;
 448         work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
 449         work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
 450         work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 451         work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
 452
 453         if (skb->protocol == htons(ETH_P_IP)) {
 454                 work->word2.s.ip_offset = 14;
 455 #if 0
 456                 work->word2.s.vlan_valid = 0;   /* FIXME */
 457                 work->word2.s.vlan_cfi = 0;     /* FIXME */
 458                 work->word2.s.vlan_id = 0;      /* FIXME */
 459                 work->word2.s.dec_ipcomp = 0;   /* FIXME */
 460 #endif
 461                 work->word2.s.tcp_or_udp =
 462                     (ip_hdr(skb)->protocol == IP_PROTOCOL_TCP)
 463                     || (ip_hdr(skb)->protocol == IP_PROTOCOL_UDP);
 464 #if 0
 465                 /* FIXME */
 466                 work->word2.s.dec_ipsec = 0;
 467                 /* We only support IPv4 right now */
 468                 work->word2.s.is_v6 = 0;
 469                 /* Hardware would set to zero */
 470                 work->word2.s.software = 0;
 471                 /* No error, packet is internal */
 472                 work->word2.s.L4_error = 0;
 473 #endif
 474                 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
 475                                           || (ip_hdr(skb)->frag_off ==
 476                                               1 << 14));
 477 #if 0
 478                 /* Assume Linux is sending a good packet */
 479                 work->word2.s.IP_exc = 0;
 480 #endif
 481                 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
 482                 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
 483 #if 0
 484                 /* This is an IP packet */
 485                 work->word2.s.not_IP = 0;
 486                 /* No error, packet is internal */
 487                 work->word2.s.rcv_error = 0;
 488                 /* No error, packet is internal */
 489                 work->word2.s.err_code = 0;
 490 #endif
 491
 492                 /*
 493                  * When copying the data, include 4 bytes of the
 494                  * ethernet header to align the same way hardware
 495                  * does.
 496                  */
 497                 memcpy(work->packet_data, skb->data + 10,
 498                        sizeof(work->packet_data));
 499         } else {
 500 #if 0
 501                 work->word2.snoip.vlan_valid = 0;       /* FIXME */
 502                 work->word2.snoip.vlan_cfi = 0; /* FIXME */
 503                 work->word2.snoip.vlan_id = 0;  /* FIXME */
 504                 work->word2.snoip.software = 0; /* Hardware would set to zero */
 505 #endif
 506                 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
 507                 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
 508                 work->word2.snoip.is_bcast =
 509                     (skb->pkt_type == PACKET_BROADCAST);
 510                 work->word2.snoip.is_mcast =
 511                     (skb->pkt_type == PACKET_MULTICAST);
 512                 work->word2.snoip.not_IP = 1;   /* IP was done up above */
 513 #if 0
 514                 /* No error, packet is internal */
 515                 work->word2.snoip.rcv_error = 0;
 516                 /* No error, packet is internal */
 517                 work->word2.snoip.err_code = 0;
 518 #endif
 519                 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
 520         }
 521
 522         /* Submit the packet to the POW */
 523         cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
 524                              work->grp);
 525         priv->stats.tx_packets++;
 526         priv->stats.tx_bytes += skb->len;
 527         dev_kfree_skb(skb);
 528         return 0;
 529 }
 530
 531 /**
 532  * Transmit a work queue entry out of the ethernet port. Both
 533  * the work queue entry and the packet data can optionally be
 534  * freed. The work will be freed on error as well.
 535  *
 536  * @dev:     Device to transmit out.
 537  * @work_queue_entry:
 538  *                Work queue entry to send
 539  * @do_free: True if the work queue entry and packet data should be
 540  *                freed. If false, neither will be freed.
 541  * @qos:     Index into the queues for this port to transmit on. This
 542  *                is used to implement QoS if their are multiple queues per
 543  *                port. This parameter must be between 0 and the number of
 544  *                queues per port minus 1. Values outside of this range will
 545  *                be change to zero.
 546  *
 547  * Returns Zero on success, negative on failure.
 548  */
 549 int cvm_oct_transmit_qos(struct net_device *dev, void *work_queue_entry,
 550                          int do_free, int qos)
 551 {
 552         unsigned long flags;
 553         union cvmx_buf_ptr hw_buffer;
 554         cvmx_pko_command_word0_t pko_command;
 555         int dropped;
 556         struct octeon_ethernet *priv = netdev_priv(dev);
 557         cvmx_wqe_t *work = work_queue_entry;
 558
 559         if (!(dev->flags & IFF_UP)) {
 560                 DEBUGPRINT("%s: Device not up\n", dev->name);
 561                 if (do_free)
 562                         cvm_oct_free_work(work);
 563                 return -1;
 564         }
 565
 566         /* The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to completely
 567            remove "qos" in the event neither interface supports
 568            multiple queues per port */
 569         if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
 570             (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
 571                 if (qos <= 0)
 572                         qos = 0;
 573                 else if (qos >= cvmx_pko_get_num_queues(priv->port))
 574                         qos = 0;
 575         } else
 576                 qos = 0;
 577
 578         /* Start off assuming no drop */
 579         dropped = 0;
 580
 581         local_irq_save(flags);
 582         cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
 583                                      CVMX_PKO_LOCK_CMD_QUEUE);
 584
 585         /* Build the PKO buffer pointer */
 586         hw_buffer.u64 = 0;
 587         hw_buffer.s.addr = work->packet_ptr.s.addr;
 588         hw_buffer.s.pool = CVMX_FPA_PACKET_POOL;
 589         hw_buffer.s.size = CVMX_FPA_PACKET_POOL_SIZE;
 590         hw_buffer.s.back = work->packet_ptr.s.back;
 591
 592         /* Build the PKO command */
 593         pko_command.u64 = 0;
 594         pko_command.s.n2 = 1;   /* Don't pollute L2 with the outgoing packet */
 595         pko_command.s.dontfree = !do_free;
 596         pko_command.s.segs = work->word2.s.bufs;
 597         pko_command.s.total_bytes = work->len;
 598
 599         /* Check if we can use the hardware checksumming */
 600         if (unlikely(work->word2.s.not_IP || work->word2.s.IP_exc))
 601                 pko_command.s.ipoffp1 = 0;
 602         else
 603                 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
 604
 605         /* Send the packet to the output queue */
 606         if (unlikely
 607             (cvmx_pko_send_packet_finish
 608              (priv->port, priv->queue + qos, pko_command, hw_buffer,
 609               CVMX_PKO_LOCK_CMD_QUEUE))) {
 610                 DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
 611                 dropped = -1;
 612         }
 613         local_irq_restore(flags);
 614
 615         if (unlikely(dropped)) {
 616                 if (do_free)
 617                         cvm_oct_free_work(work);
 618                 priv->stats.tx_dropped++;
 619         } else if (do_free)
 620                 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
 621
 622         return dropped;
 623 }
 624 EXPORT_SYMBOL(cvm_oct_transmit_qos);
 625
 626 /**
 627  * This function frees all skb that are currenty queued for TX.
 628  *
 629  * @dev:    Device being shutdown
 630  */
 631 void cvm_oct_tx_shutdown(struct net_device *dev)
 632 {
 633         struct octeon_ethernet *priv = netdev_priv(dev);
 634         unsigned long flags;
 635         int qos;
 636
 637         for (qos = 0; qos < 16; qos++) {
 638                 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 639                 while (skb_queue_len(&priv->tx_free_list[qos]))
 640                         dev_kfree_skb_any(__skb_dequeue
 641                                           (&priv->tx_free_list[qos]));
 642                 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
 643         }
 644 }