drivers/net/mlx5/mlx5_rxtx.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright 2015 6WIND S.A.
   5  *   Copyright 2015 Mellanox.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of 6WIND S.A. nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <assert.h>
  35 #include <stdint.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38
  39 /* Verbs header. */
  40 /* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
  41 #ifdef PEDANTIC
  42 #pragma GCC diagnostic ignored "-pedantic"
  43 #endif
  44 #include <infiniband/verbs.h>
  45 #ifdef PEDANTIC
  46 #pragma GCC diagnostic error "-pedantic"
  47 #endif
  48
  49 /* DPDK headers don't like -pedantic. */
  50 #ifdef PEDANTIC
  51 #pragma GCC diagnostic ignored "-pedantic"
  52 #endif
  53 #include <rte_mbuf.h>
  54 #include <rte_mempool.h>
  55 #include <rte_prefetch.h>
  56 #include <rte_common.h>
  57 #include <rte_branch_prediction.h>
  58 #include <rte_memory.h>
  59 #ifdef PEDANTIC
  60 #pragma GCC diagnostic error "-pedantic"
  61 #endif
  62
  63 #include "mlx5.h"
  64 #include "mlx5_utils.h"
  65 #include "mlx5_rxtx.h"
  66 #include "mlx5_autoconf.h"
  67 #include "mlx5_defs.h"
  68
  69 /**
  70  * Manage TX completions.
  71  *
  72  * When sending a burst, mlx5_tx_burst() posts several WRs.
  73  * To improve performance, a completion event is only required once every
  74  * MLX5_PMD_TX_PER_COMP_REQ sends. Doing so discards completion information
  75  * for other WRs, but this information would not be used anyway.
  76  *
  77  * @param txq
  78  *   Pointer to TX queue structure.
  79  *
  80  * @return
  81  *   0 on success, -1 on failure.
  82  */
  83 static int
  84 txq_complete(struct txq *txq)
  85 {
  86         unsigned int elts_comp = txq->elts_comp;
  87         unsigned int elts_tail = txq->elts_tail;
  88         unsigned int elts_free = txq->elts_tail;
  89         const unsigned int elts_n = txq->elts_n;
  90         int wcs_n;
  91
  92         if (unlikely(elts_comp == 0))
  93                 return 0;
  94 #ifdef DEBUG_SEND
  95         DEBUG("%p: processing %u work requests completions",
  96               (void *)txq, elts_comp);
  97 #endif
  98         wcs_n = txq->poll_cnt(txq->cq, elts_comp);
  99         if (unlikely(wcs_n == 0))
 100                 return 0;
 101         if (unlikely(wcs_n < 0)) {
 102                 DEBUG("%p: ibv_poll_cq() failed (wcs_n=%d)",
 103                       (void *)txq, wcs_n);
 104                 return -1;
 105         }
 106         elts_comp -= wcs_n;
 107         assert(elts_comp <= txq->elts_comp);
 108         /*
 109          * Assume WC status is successful as nothing can be done about it
 110          * anyway.
 111          */
 112         elts_tail += wcs_n * txq->elts_comp_cd_init;
 113         if (elts_tail >= elts_n)
 114                 elts_tail -= elts_n;
 115
 116         while (elts_free != elts_tail) {
 117                 struct txq_elt *elt = &(*txq->elts)[elts_free];
 118                 unsigned int elts_free_next =
 119                         (((elts_free + 1) == elts_n) ? 0 : elts_free + 1);
 120                 struct rte_mbuf *tmp = elt->buf;
 121                 struct txq_elt *elt_next = &(*txq->elts)[elts_free_next];
 122
 123 #ifndef NDEBUG
 124                 /* Poisoning. */
 125                 memset(elt, 0x66, sizeof(*elt));
 126 #endif
 127                 RTE_MBUF_PREFETCH_TO_FREE(elt_next->buf);
 128                 /* Faster than rte_pktmbuf_free(). */
 129                 do {
 130                         struct rte_mbuf *next = NEXT(tmp);
 131
 132                         rte_pktmbuf_free_seg(tmp);
 133                         tmp = next;
 134                 } while (tmp != NULL);
 135                 elts_free = elts_free_next;
 136         }
 137
 138         txq->elts_tail = elts_tail;
 139         txq->elts_comp = elts_comp;
 140         return 0;
 141 }
 142
 143 /* For best performance, this function should not be inlined. */
 144 struct ibv_mr *mlx5_mp2mr(struct ibv_pd *, const struct rte_mempool *)
 145         __attribute__((noinline));
 146
 147 /**
 148  * Register mempool as a memory region.
 149  *
 150  * @param pd
 151  *   Pointer to protection domain.
 152  * @param mp
 153  *   Pointer to memory pool.
 154  *
 155  * @return
 156  *   Memory region pointer, NULL in case of error.
 157  */
 158 struct ibv_mr *
 159 mlx5_mp2mr(struct ibv_pd *pd, const struct rte_mempool *mp)
 160 {
 161         const struct rte_memseg *ms = rte_eal_get_physmem_layout();
 162         uintptr_t start = mp->elt_va_start;
 163         uintptr_t end = mp->elt_va_end;
 164         unsigned int i;
 165
 166         DEBUG("mempool %p area start=%p end=%p size=%zu",
 167               (const void *)mp, (void *)start, (void *)end,
 168               (size_t)(end - start));
 169         /* Round start and end to page boundary if found in memory segments. */
 170         for (i = 0; (i < RTE_MAX_MEMSEG) && (ms[i].addr != NULL); ++i) {
 171                 uintptr_t addr = (uintptr_t)ms[i].addr;
 172                 size_t len = ms[i].len;
 173                 unsigned int align = ms[i].hugepage_sz;
 174
 175                 if ((start > addr) && (start < addr + len))
 176                         start = RTE_ALIGN_FLOOR(start, align);
 177                 if ((end > addr) && (end < addr + len))
 178                         end = RTE_ALIGN_CEIL(end, align);
 179         }
 180         DEBUG("mempool %p using start=%p end=%p size=%zu for MR",
 181               (const void *)mp, (void *)start, (void *)end,
 182               (size_t)(end - start));
 183         return ibv_reg_mr(pd,
 184                           (void *)start,
 185                           end - start,
 186                           IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE);
 187 }
 188
 189 /**
 190  * Get Memory Pool (MP) from mbuf. If mbuf is indirect, the pool from which
 191  * the cloned mbuf is allocated is returned instead.
 192  *
 193  * @param buf
 194  *   Pointer to mbuf.
 195  *
 196  * @return
 197  *   Memory pool where data is located for given mbuf.
 198  */
 199 static struct rte_mempool *
 200 txq_mb2mp(struct rte_mbuf *buf)
 201 {
 202         if (unlikely(RTE_MBUF_INDIRECT(buf)))
 203                 return rte_mbuf_from_indirect(buf)->pool;
 204         return buf->pool;
 205 }
 206
 207 /**
 208  * Get Memory Region (MR) <-> Memory Pool (MP) association from txq->mp2mr[].
 209  * Add MP to txq->mp2mr[] if it's not registered yet. If mp2mr[] is full,
 210  * remove an entry first.
 211  *
 212  * @param txq
 213  *   Pointer to TX queue structure.
 214  * @param[in] mp
 215  *   Memory Pool for which a Memory Region lkey must be returned.
 216  *
 217  * @return
 218  *   mr->lkey on success, (uint32_t)-1 on failure.
 219  */
 220 static uint32_t
 221 txq_mp2mr(struct txq *txq, const struct rte_mempool *mp)
 222 {
 223         unsigned int i;
 224         struct ibv_mr *mr;
 225
 226         for (i = 0; (i != RTE_DIM(txq->mp2mr)); ++i) {
 227                 if (unlikely(txq->mp2mr[i].mp == NULL)) {
 228                         /* Unknown MP, add a new MR for it. */
 229                         break;
 230                 }
 231                 if (txq->mp2mr[i].mp == mp) {
 232                         assert(txq->mp2mr[i].lkey != (uint32_t)-1);
 233                         assert(txq->mp2mr[i].mr->lkey == txq->mp2mr[i].lkey);
 234                         return txq->mp2mr[i].lkey;
 235                 }
 236         }
 237         /* Add a new entry, register MR first. */
 238         DEBUG("%p: discovered new memory pool \"%s\" (%p)",
 239               (void *)txq, mp->name, (const void *)mp);
 240         mr = mlx5_mp2mr(txq->priv->pd, mp);
 241         if (unlikely(mr == NULL)) {
 242                 DEBUG("%p: unable to configure MR, ibv_reg_mr() failed.",
 243                       (void *)txq);
 244                 return (uint32_t)-1;
 245         }
 246         if (unlikely(i == RTE_DIM(txq->mp2mr))) {
 247                 /* Table is full, remove oldest entry. */
 248                 DEBUG("%p: MR <-> MP table full, dropping oldest entry.",
 249                       (void *)txq);
 250                 --i;
 251                 claim_zero(ibv_dereg_mr(txq->mp2mr[0].mr));
 252                 memmove(&txq->mp2mr[0], &txq->mp2mr[1],
 253                         (sizeof(txq->mp2mr) - sizeof(txq->mp2mr[0])));
 254         }
 255         /* Store the new entry. */
 256         txq->mp2mr[i].mp = mp;
 257         txq->mp2mr[i].mr = mr;
 258         txq->mp2mr[i].lkey = mr->lkey;
 259         DEBUG("%p: new MR lkey for MP \"%s\" (%p): 0x%08" PRIu32,
 260               (void *)txq, mp->name, (const void *)mp, txq->mp2mr[i].lkey);
 261         return txq->mp2mr[i].lkey;
 262 }
 263
 264 struct txq_mp2mr_mbuf_check_data {
 265         const struct rte_mempool *mp;
 266         int ret;
 267 };
 268
 269 /**
 270  * Callback function for rte_mempool_obj_iter() to check whether a given
 271  * mempool object looks like a mbuf.
 272  *
 273  * @param[in, out] arg
 274  *   Context data (struct txq_mp2mr_mbuf_check_data). Contains mempool pointer
 275  *   and return value.
 276  * @param[in] start
 277  *   Object start address.
 278  * @param[in] end
 279  *   Object end address.
 280  * @param index
 281  *   Unused.
 282  *
 283  * @return
 284  *   Nonzero value when object is not a mbuf.
 285  */
 286 static void
 287 txq_mp2mr_mbuf_check(void *arg, void *start, void *end,
 288                      uint32_t index __rte_unused)
 289 {
 290         struct txq_mp2mr_mbuf_check_data *data = arg;
 291         struct rte_mbuf *buf =
 292                 (void *)((uintptr_t)start + data->mp->header_size);
 293
 294         (void)index;
 295         /* Check whether mbuf structure fits element size and whether mempool
 296          * pointer is valid. */
 297         if (((uintptr_t)end >= (uintptr_t)(buf + 1)) &&
 298             (buf->pool == data->mp))
 299                 data->ret = 0;
 300         else
 301                 data->ret = -1;
 302 }
 303
 304 /**
 305  * Iterator function for rte_mempool_walk() to register existing mempools and
 306  * fill the MP to MR cache of a TX queue.
 307  *
 308  * @param[in] mp
 309  *   Memory Pool to register.
 310  * @param *arg
 311  *   Pointer to TX queue structure.
 312  */
 313 void
 314 txq_mp2mr_iter(const struct rte_mempool *mp, void *arg)
 315 {
 316         struct txq *txq = arg;
 317         struct txq_mp2mr_mbuf_check_data data = {
 318                 .mp = mp,
 319                 .ret = -1,
 320         };
 321
 322         /* Discard empty mempools. */
 323         if (mp->size == 0)
 324                 return;
 325         /* Register mempool only if the first element looks like a mbuf. */
 326         rte_mempool_obj_iter((void *)mp->elt_va_start,
 327                              1,
 328                              mp->header_size + mp->elt_size + mp->trailer_size,
 329                              1,
 330                              mp->elt_pa,
 331                              mp->pg_num,
 332                              mp->pg_shift,
 333                              txq_mp2mr_mbuf_check,
 334                              &data);
 335         if (data.ret)
 336                 return;
 337         txq_mp2mr(txq, mp);
 338 }
 339
 340 /**
 341  * Insert VLAN using mbuf headroom space.
 342  *
 343  * @param buf
 344  *   Buffer for VLAN insertion.
 345  *
 346  * @return
 347  *   0 on success, errno value on failure.
 348  */
 349 static inline int
 350 insert_vlan_sw(struct rte_mbuf *buf)
 351 {
 352         uintptr_t addr;
 353         uint32_t vlan;
 354         uint16_t head_room_len = rte_pktmbuf_headroom(buf);
 355
 356         if (head_room_len < 4)
 357                 return EINVAL;
 358
 359         addr = rte_pktmbuf_mtod(buf, uintptr_t);
 360         vlan = htonl(0x81000000 | buf->vlan_tci);
 361         memmove((void *)(addr - 4), (void *)addr, 12);
 362         memcpy((void *)(addr + 8), &vlan, sizeof(vlan));
 363
 364         SET_DATA_OFF(buf, head_room_len - 4);
 365         DATA_LEN(buf) += 4;
 366
 367         return 0;
 368 }
 369
 370 #if MLX5_PMD_SGE_WR_N > 1
 371
 372 /**
 373  * Copy scattered mbuf contents to a single linear buffer.
 374  *
 375  * @param[out] linear
 376  *   Linear output buffer.
 377  * @param[in] buf
 378  *   Scattered input buffer.
 379  *
 380  * @return
 381  *   Number of bytes copied to the output buffer or 0 if not large enough.
 382  */
 383 static unsigned int
 384 linearize_mbuf(linear_t *linear, struct rte_mbuf *buf)
 385 {
 386         unsigned int size = 0;
 387         unsigned int offset;
 388
 389         do {
 390                 unsigned int len = DATA_LEN(buf);
 391
 392                 offset = size;
 393                 size += len;
 394                 if (unlikely(size > sizeof(*linear)))
 395                         return 0;
 396                 memcpy(&(*linear)[offset],
 397                        rte_pktmbuf_mtod(buf, uint8_t *),
 398                        len);
 399                 buf = NEXT(buf);
 400         } while (buf != NULL);
 401         return size;
 402 }
 403
 404 /**
 405  * Handle scattered buffers for mlx5_tx_burst().
 406  *
 407  * @param txq
 408  *   TX queue structure.
 409  * @param segs
 410  *   Number of segments in buf.
 411  * @param elt
 412  *   TX queue element to fill.
 413  * @param[in] buf
 414  *   Buffer to process.
 415  * @param elts_head
 416  *   Index of the linear buffer to use if necessary (normally txq->elts_head).
 417  * @param[out] sges
 418  *   Array filled with SGEs on success.
 419  *
 420  * @return
 421  *   A structure containing the processed packet size in bytes and the
 422  *   number of SGEs. Both fields are set to (unsigned int)-1 in case of
 423  *   failure.
 424  */
 425 static struct tx_burst_sg_ret {
 426         unsigned int length;
 427         unsigned int num;
 428 }
 429 tx_burst_sg(struct txq *txq, unsigned int segs, struct txq_elt *elt,
 430             struct rte_mbuf *buf, unsigned int elts_head,
 431             struct ibv_sge (*sges)[MLX5_PMD_SGE_WR_N])
 432 {
 433         unsigned int sent_size = 0;
 434         unsigned int j;
 435         int linearize = 0;
 436
 437         /* When there are too many segments, extra segments are
 438          * linearized in the last SGE. */
 439         if (unlikely(segs > RTE_DIM(*sges))) {
 440                 segs = (RTE_DIM(*sges) - 1);
 441                 linearize = 1;
 442         }
 443         /* Update element. */
 444         elt->buf = buf;
 445         /* Register segments as SGEs. */
 446         for (j = 0; (j != segs); ++j) {
 447                 struct ibv_sge *sge = &(*sges)[j];
 448                 uint32_t lkey;
 449
 450                 /* Retrieve Memory Region key for this memory pool. */
 451                 lkey = txq_mp2mr(txq, txq_mb2mp(buf));
 452                 if (unlikely(lkey == (uint32_t)-1)) {
 453                         /* MR does not exist. */
 454                         DEBUG("%p: unable to get MP <-> MR association",
 455                               (void *)txq);
 456                         /* Clean up TX element. */
 457                         elt->buf = NULL;
 458                         goto stop;
 459                 }
 460                 /* Update SGE. */
 461                 sge->addr = rte_pktmbuf_mtod(buf, uintptr_t);
 462                 if (txq->priv->vf)
 463                         rte_prefetch0((volatile void *)
 464                                       (uintptr_t)sge->addr);
 465                 sge->length = DATA_LEN(buf);
 466                 sge->lkey = lkey;
 467                 sent_size += sge->length;
 468                 buf = NEXT(buf);
 469         }
 470         /* If buf is not NULL here and is not going to be linearized,
 471          * nb_segs is not valid. */
 472         assert(j == segs);
 473         assert((buf == NULL) || (linearize));
 474         /* Linearize extra segments. */
 475         if (linearize) {
 476                 struct ibv_sge *sge = &(*sges)[segs];
 477                 linear_t *linear = &(*txq->elts_linear)[elts_head];
 478                 unsigned int size = linearize_mbuf(linear, buf);
 479
 480                 assert(segs == (RTE_DIM(*sges) - 1));
 481                 if (size == 0) {
 482                         /* Invalid packet. */
 483                         DEBUG("%p: packet too large to be linearized.",
 484                               (void *)txq);
 485                         /* Clean up TX element. */
 486                         elt->buf = NULL;
 487                         goto stop;
 488                 }
 489                 /* If MLX5_PMD_SGE_WR_N is 1, free mbuf immediately. */
 490                 if (RTE_DIM(*sges) == 1) {
 491                         do {
 492                                 struct rte_mbuf *next = NEXT(buf);
 493
 494                                 rte_pktmbuf_free_seg(buf);
 495                                 buf = next;
 496                         } while (buf != NULL);
 497                         elt->buf = NULL;
 498                 }
 499                 /* Update SGE. */
 500                 sge->addr = (uintptr_t)&(*linear)[0];
 501                 sge->length = size;
 502                 sge->lkey = txq->mr_linear->lkey;
 503                 sent_size += size;
 504                 /* Include last segment. */
 505                 segs++;
 506         }
 507         return (struct tx_burst_sg_ret){
 508                 .length = sent_size,
 509                 .num = segs,
 510         };
 511 stop:
 512         return (struct tx_burst_sg_ret){
 513                 .length = -1,
 514                 .num = -1,
 515         };
 516 }
 517
 518 #endif /* MLX5_PMD_SGE_WR_N > 1 */
 519
 520 /**
 521  * DPDK callback for TX.
 522  *
 523  * @param dpdk_txq
 524  *   Generic pointer to TX queue structure.
 525  * @param[in] pkts
 526  *   Packets to transmit.
 527  * @param pkts_n
 528  *   Number of packets in array.
 529  *
 530  * @return
 531  *   Number of packets successfully transmitted (<= pkts_n).
 532  */
 533 uint16_t
 534 mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 535 {
 536         struct txq *txq = (struct txq *)dpdk_txq;
 537         unsigned int elts_head = txq->elts_head;
 538         const unsigned int elts_n = txq->elts_n;
 539         unsigned int elts_comp_cd = txq->elts_comp_cd;
 540         unsigned int elts_comp = 0;
 541         unsigned int i;
 542         unsigned int max;
 543         int err;
 544         struct rte_mbuf *buf = pkts[0];
 545
 546         assert(elts_comp_cd != 0);
 547         /* Prefetch first packet cacheline. */
 548         rte_prefetch0(buf);
 549         txq_complete(txq);
 550         max = (elts_n - (elts_head - txq->elts_tail));
 551         if (max > elts_n)
 552                 max -= elts_n;
 553         assert(max >= 1);
 554         assert(max <= elts_n);
 555         /* Always leave one free entry in the ring. */
 556         --max;
 557         if (max == 0)
 558                 return 0;
 559         if (max > pkts_n)
 560                 max = pkts_n;
 561         for (i = 0; (i != max); ++i) {
 562                 struct rte_mbuf *buf_next = pkts[i + 1];
 563                 unsigned int elts_head_next =
 564                         (((elts_head + 1) == elts_n) ? 0 : elts_head + 1);
 565                 struct txq_elt *elt = &(*txq->elts)[elts_head];
 566                 unsigned int segs = NB_SEGS(buf);
 567 #ifdef MLX5_PMD_SOFT_COUNTERS
 568                 unsigned int sent_size = 0;
 569 #endif
 570                 uint32_t send_flags = 0;
 571 #ifdef HAVE_VERBS_VLAN_INSERTION
 572                 int insert_vlan = 0;
 573 #endif /* HAVE_VERBS_VLAN_INSERTION */
 574
 575                 if (i + 1 < max)
 576                         rte_prefetch0(buf_next);
 577                 /* Request TX completion. */
 578                 if (unlikely(--elts_comp_cd == 0)) {
 579                         elts_comp_cd = txq->elts_comp_cd_init;
 580                         ++elts_comp;
 581                         send_flags |= IBV_EXP_QP_BURST_SIGNALED;
 582                 }
 583                 /* Should we enable HW CKSUM offload */
 584                 if (buf->ol_flags &
 585                     (PKT_TX_IP_CKSUM | PKT_TX_TCP_CKSUM | PKT_TX_UDP_CKSUM)) {
 586                         send_flags |= IBV_EXP_QP_BURST_IP_CSUM;
 587                         /* HW does not support checksum offloads at arbitrary
 588                          * offsets but automatically recognizes the packet
 589                          * type. For inner L3/L4 checksums, only VXLAN (UDP)
 590                          * tunnels are currently supported. */
 591                         if (RTE_ETH_IS_TUNNEL_PKT(buf->packet_type))
 592                                 send_flags |= IBV_EXP_QP_BURST_TUNNEL;
 593                 }
 594                 if (buf->ol_flags & PKT_TX_VLAN_PKT) {
 595 #ifdef HAVE_VERBS_VLAN_INSERTION
 596                         if (!txq->priv->mps)
 597                                 insert_vlan = 1;
 598                         else
 599 #endif /* HAVE_VERBS_VLAN_INSERTION */
 600                         {
 601                                 err = insert_vlan_sw(buf);
 602                                 if (unlikely(err))
 603                                         goto stop;
 604                         }
 605                 }
 606                 if (likely(segs == 1)) {
 607                         uintptr_t addr;
 608                         uint32_t length;
 609                         uint32_t lkey;
 610                         uintptr_t buf_next_addr;
 611
 612                         /* Retrieve buffer information. */
 613                         addr = rte_pktmbuf_mtod(buf, uintptr_t);
 614                         length = DATA_LEN(buf);
 615                         /* Update element. */
 616                         elt->buf = buf;
 617                         if (txq->priv->vf)
 618                                 rte_prefetch0((volatile void *)
 619                                               (uintptr_t)addr);
 620                         /* Prefetch next buffer data. */
 621                         if (i + 1 < max) {
 622                                 buf_next_addr =
 623                                         rte_pktmbuf_mtod(buf_next, uintptr_t);
 624                                 rte_prefetch0((volatile void *)
 625                                               (uintptr_t)buf_next_addr);
 626                         }
 627                         /* Put packet into send queue. */
 628 #if MLX5_PMD_MAX_INLINE > 0
 629                         if (length <= txq->max_inline) {
 630 #ifdef HAVE_VERBS_VLAN_INSERTION
 631                                 if (insert_vlan)
 632                                         err = txq->send_pending_inline_vlan
 633                                                 (txq->qp,
 634                                                  (void *)addr,
 635                                                  length,
 636                                                  send_flags,
 637                                                  &buf->vlan_tci);
 638                                 else
 639 #endif /* HAVE_VERBS_VLAN_INSERTION */
 640                                         err = txq->send_pending_inline
 641                                                 (txq->qp,
 642                                                  (void *)addr,
 643                                                  length,
 644                                                  send_flags);
 645                         } else
 646 #endif
 647                         {
 648                                 /* Retrieve Memory Region key for this
 649                                  * memory pool. */
 650                                 lkey = txq_mp2mr(txq, txq_mb2mp(buf));
 651                                 if (unlikely(lkey == (uint32_t)-1)) {
 652                                         /* MR does not exist. */
 653                                         DEBUG("%p: unable to get MP <-> MR"
 654                                               " association", (void *)txq);
 655                                         /* Clean up TX element. */
 656                                         elt->buf = NULL;
 657                                         goto stop;
 658                                 }
 659 #ifdef HAVE_VERBS_VLAN_INSERTION
 660                                 if (insert_vlan)
 661                                         err = txq->send_pending_vlan
 662                                                 (txq->qp,
 663                                                  addr,
 664                                                  length,
 665                                                  lkey,
 666                                                  send_flags,
 667                                                  &buf->vlan_tci);
 668                                 else
 669 #endif /* HAVE_VERBS_VLAN_INSERTION */
 670                                         err = txq->send_pending
 671                                                 (txq->qp,
 672                                                  addr,
 673                                                  length,
 674                                                  lkey,
 675                                                  send_flags);
 676                         }
 677                         if (unlikely(err))
 678                                 goto stop;
 679 #ifdef MLX5_PMD_SOFT_COUNTERS
 680                         sent_size += length;
 681 #endif
 682                 } else {
 683 #if MLX5_PMD_SGE_WR_N > 1
 684                         struct ibv_sge sges[MLX5_PMD_SGE_WR_N];
 685                         struct tx_burst_sg_ret ret;
 686
 687                         ret = tx_burst_sg(txq, segs, elt, buf, elts_head,
 688                                           &sges);
 689                         if (ret.length == (unsigned int)-1)
 690                                 goto stop;
 691                         /* Put SG list into send queue. */
 692 #ifdef HAVE_VERBS_VLAN_INSERTION
 693                         if (insert_vlan)
 694                                 err = txq->send_pending_sg_list_vlan
 695                                         (txq->qp,
 696                                          sges,
 697                                          ret.num,
 698                                          send_flags,
 699                                          &buf->vlan_tci);
 700                         else
 701 #endif /* HAVE_VERBS_VLAN_INSERTION */
 702                                 err = txq->send_pending_sg_list
 703                                         (txq->qp,
 704                                          sges,
 705                                          ret.num,
 706                                          send_flags);
 707                         if (unlikely(err))
 708                                 goto stop;
 709 #ifdef MLX5_PMD_SOFT_COUNTERS
 710                         sent_size += ret.length;
 711 #endif
 712 #else /* MLX5_PMD_SGE_WR_N > 1 */
 713                         DEBUG("%p: TX scattered buffers support not"
 714                               " compiled in", (void *)txq);
 715                         goto stop;
 716 #endif /* MLX5_PMD_SGE_WR_N > 1 */
 717                 }
 718                 elts_head = elts_head_next;
 719                 buf = buf_next;
 720 #ifdef MLX5_PMD_SOFT_COUNTERS
 721                 /* Increment sent bytes counter. */
 722                 txq->stats.obytes += sent_size;
 723 #endif
 724         }
 725 stop:
 726         /* Take a shortcut if nothing must be sent. */
 727         if (unlikely(i == 0))
 728                 return 0;
 729 #ifdef MLX5_PMD_SOFT_COUNTERS
 730         /* Increment sent packets counter. */
 731         txq->stats.opackets += i;
 732 #endif
 733         /* Ring QP doorbell. */
 734         err = txq->send_flush(txq->qp);
 735         if (unlikely(err)) {
 736                 /* A nonzero value is not supposed to be returned.
 737                  * Nothing can be done about it. */
 738                 DEBUG("%p: send_flush() failed with error %d",
 739                       (void *)txq, err);
 740         }
 741         txq->elts_head = elts_head;
 742         txq->elts_comp += elts_comp;
 743         txq->elts_comp_cd = elts_comp_cd;
 744         return i;
 745 }
 746
 747 /**
 748  * Translate RX completion flags to packet type.
 749  *
 750  * @param flags
 751  *   RX completion flags returned by poll_length_flags().
 752  *
 753  * @note: fix mlx5_dev_supported_ptypes_get() if any change here.
 754  *
 755  * @return
 756  *   Packet type for struct rte_mbuf.
 757  */
 758 static inline uint32_t
 759 rxq_cq_to_pkt_type(uint32_t flags)
 760 {
 761         uint32_t pkt_type;
 762
 763         if (flags & IBV_EXP_CQ_RX_TUNNEL_PACKET)
 764                 pkt_type =
 765                         TRANSPOSE(flags,
 766                                   IBV_EXP_CQ_RX_OUTER_IPV4_PACKET,
 767                                   RTE_PTYPE_L3_IPV4) |
 768                         TRANSPOSE(flags,
 769                                   IBV_EXP_CQ_RX_OUTER_IPV6_PACKET,
 770                                   RTE_PTYPE_L3_IPV6) |
 771                         TRANSPOSE(flags,
 772                                   IBV_EXP_CQ_RX_IPV4_PACKET,
 773                                   RTE_PTYPE_INNER_L3_IPV4) |
 774                         TRANSPOSE(flags,
 775                                   IBV_EXP_CQ_RX_IPV6_PACKET,
 776                                   RTE_PTYPE_INNER_L3_IPV6);
 777         else
 778                 pkt_type =
 779                         TRANSPOSE(flags,
 780                                   IBV_EXP_CQ_RX_IPV4_PACKET,
 781                                   RTE_PTYPE_L3_IPV4) |
 782                         TRANSPOSE(flags,
 783                                   IBV_EXP_CQ_RX_IPV6_PACKET,
 784                                   RTE_PTYPE_L3_IPV6);
 785         return pkt_type;
 786 }
 787
 788 /**
 789  * Translate RX completion flags to offload flags.
 790  *
 791  * @param[in] rxq
 792  *   Pointer to RX queue structure.
 793  * @param flags
 794  *   RX completion flags returned by poll_length_flags().
 795  *
 796  * @return
 797  *   Offload flags (ol_flags) for struct rte_mbuf.
 798  */
 799 static inline uint32_t
 800 rxq_cq_to_ol_flags(const struct rxq *rxq, uint32_t flags)
 801 {
 802         uint32_t ol_flags = 0;
 803
 804         if (rxq->csum) {
 805                 /* Set IP checksum flag only for IPv4/IPv6 packets. */
 806                 if (flags &
 807                     (IBV_EXP_CQ_RX_IPV4_PACKET | IBV_EXP_CQ_RX_IPV6_PACKET))
 808                         ol_flags |=
 809                                 TRANSPOSE(~flags,
 810                                         IBV_EXP_CQ_RX_IP_CSUM_OK,
 811                                         PKT_RX_IP_CKSUM_BAD);
 812 #ifdef HAVE_EXP_CQ_RX_TCP_PACKET
 813                 /* Set L4 checksum flag only for TCP/UDP packets. */
 814                 if (flags &
 815                     (IBV_EXP_CQ_RX_TCP_PACKET | IBV_EXP_CQ_RX_UDP_PACKET))
 816 #endif /* HAVE_EXP_CQ_RX_TCP_PACKET */
 817                         ol_flags |=
 818                                 TRANSPOSE(~flags,
 819                                         IBV_EXP_CQ_RX_TCP_UDP_CSUM_OK,
 820                                         PKT_RX_L4_CKSUM_BAD);
 821         }
 822         /*
 823          * PKT_RX_IP_CKSUM_BAD and PKT_RX_L4_CKSUM_BAD are used in place
 824          * of PKT_RX_EIP_CKSUM_BAD because the latter is not functional
 825          * (its value is 0).
 826          */
 827         if ((flags & IBV_EXP_CQ_RX_TUNNEL_PACKET) && (rxq->csum_l2tun))
 828                 ol_flags |=
 829                         TRANSPOSE(~flags,
 830                                   IBV_EXP_CQ_RX_OUTER_IP_CSUM_OK,
 831                                   PKT_RX_IP_CKSUM_BAD) |
 832                         TRANSPOSE(~flags,
 833                                   IBV_EXP_CQ_RX_OUTER_TCP_UDP_CSUM_OK,
 834                                   PKT_RX_L4_CKSUM_BAD);
 835         return ol_flags;
 836 }
 837
 838 /**
 839  * DPDK callback for RX with scattered packets support.
 840  *
 841  * @param dpdk_rxq
 842  *   Generic pointer to RX queue structure.
 843  * @param[out] pkts
 844  *   Array to store received packets.
 845  * @param pkts_n
 846  *   Maximum number of packets in array.
 847  *
 848  * @return
 849  *   Number of packets successfully received (<= pkts_n).
 850  */
 851 uint16_t
 852 mlx5_rx_burst_sp(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 853 {
 854         struct rxq *rxq = (struct rxq *)dpdk_rxq;
 855         struct rxq_elt_sp (*elts)[rxq->elts_n] = rxq->elts.sp;
 856         const unsigned int elts_n = rxq->elts_n;
 857         unsigned int elts_head = rxq->elts_head;
 858         unsigned int i;
 859         unsigned int pkts_ret = 0;
 860         int ret;
 861
 862         if (unlikely(!rxq->sp))
 863                 return mlx5_rx_burst(dpdk_rxq, pkts, pkts_n);
 864         if (unlikely(elts == NULL)) /* See RTE_DEV_CMD_SET_MTU. */
 865                 return 0;
 866         for (i = 0; (i != pkts_n); ++i) {
 867                 struct rxq_elt_sp *elt = &(*elts)[elts_head];
 868                 unsigned int len;
 869                 unsigned int pkt_buf_len;
 870                 struct rte_mbuf *pkt_buf = NULL; /* Buffer returned in pkts. */
 871                 struct rte_mbuf **pkt_buf_next = &pkt_buf;
 872                 unsigned int seg_headroom = RTE_PKTMBUF_HEADROOM;
 873                 unsigned int j = 0;
 874                 uint32_t flags;
 875                 uint16_t vlan_tci;
 876
 877                 /* Sanity checks. */
 878                 assert(elts_head < rxq->elts_n);
 879                 assert(rxq->elts_head < rxq->elts_n);
 880                 ret = rxq->poll(rxq->cq, NULL, NULL, &flags, &vlan_tci);
 881                 if (unlikely(ret < 0)) {
 882                         struct ibv_wc wc;
 883                         int wcs_n;
 884
 885                         DEBUG("rxq=%p, poll_length() failed (ret=%d)",
 886                               (void *)rxq, ret);
 887                         /* ibv_poll_cq() must be used in case of failure. */
 888                         wcs_n = ibv_poll_cq(rxq->cq, 1, &wc);
 889                         if (unlikely(wcs_n == 0))
 890                                 break;
 891                         if (unlikely(wcs_n < 0)) {
 892                                 DEBUG("rxq=%p, ibv_poll_cq() failed (wcs_n=%d)",
 893                                       (void *)rxq, wcs_n);
 894                                 break;
 895                         }
 896                         assert(wcs_n == 1);
 897                         if (unlikely(wc.status != IBV_WC_SUCCESS)) {
 898                                 /* Whatever, just repost the offending WR. */
 899                                 DEBUG("rxq=%p, wr_id=%" PRIu64 ": bad work"
 900                                       " completion status (%d): %s",
 901                                       (void *)rxq, wc.wr_id, wc.status,
 902                                       ibv_wc_status_str(wc.status));
 903 #ifdef MLX5_PMD_SOFT_COUNTERS
 904                                 /* Increment dropped packets counter. */
 905                                 ++rxq->stats.idropped;
 906 #endif
 907                                 goto repost;
 908                         }
 909                         ret = wc.byte_len;
 910                 }
 911                 if (ret == 0)
 912                         break;
 913                 assert(ret >= (rxq->crc_present << 2));
 914                 len = ret - (rxq->crc_present << 2);
 915                 pkt_buf_len = len;
 916                 /*
 917                  * Replace spent segments with new ones, concatenate and
 918                  * return them as pkt_buf.
 919                  */
 920                 while (1) {
 921                         struct ibv_sge *sge = &elt->sges[j];
 922                         struct rte_mbuf *seg = elt->bufs[j];
 923                         struct rte_mbuf *rep;
 924                         unsigned int seg_tailroom;
 925
 926                         assert(seg != NULL);
 927                         /*
 928                          * Fetch initial bytes of packet descriptor into a
 929                          * cacheline while allocating rep.
 930                          */
 931                         rte_prefetch0(seg);
 932                         rep = __rte_mbuf_raw_alloc(rxq->mp);
 933                         if (unlikely(rep == NULL)) {
 934                                 /*
 935                                  * Unable to allocate a replacement mbuf,
 936                                  * repost WR.
 937                                  */
 938                                 DEBUG("rxq=%p: can't allocate a new mbuf",
 939                                       (void *)rxq);
 940                                 if (pkt_buf != NULL) {
 941                                         *pkt_buf_next = NULL;
 942                                         rte_pktmbuf_free(pkt_buf);
 943                                 }
 944                                 /* Increment out of memory counters. */
 945                                 ++rxq->stats.rx_nombuf;
 946                                 ++rxq->priv->dev->data->rx_mbuf_alloc_failed;
 947                                 goto repost;
 948                         }
 949 #ifndef NDEBUG
 950                         /* Poison user-modifiable fields in rep. */
 951                         NEXT(rep) = (void *)((uintptr_t)-1);
 952                         SET_DATA_OFF(rep, 0xdead);
 953                         DATA_LEN(rep) = 0xd00d;
 954                         PKT_LEN(rep) = 0xdeadd00d;
 955                         NB_SEGS(rep) = 0x2a;
 956                         PORT(rep) = 0x2a;
 957                         rep->ol_flags = -1;
 958 #endif
 959                         assert(rep->buf_len == seg->buf_len);
 960                         assert(rep->buf_len == rxq->mb_len);
 961                         /* Reconfigure sge to use rep instead of seg. */
 962                         assert(sge->lkey == rxq->mr->lkey);
 963                         sge->addr = ((uintptr_t)rep->buf_addr + seg_headroom);
 964                         elt->bufs[j] = rep;
 965                         ++j;
 966                         /* Update pkt_buf if it's the first segment, or link
 967                          * seg to the previous one and update pkt_buf_next. */
 968                         *pkt_buf_next = seg;
 969                         pkt_buf_next = &NEXT(seg);
 970                         /* Update seg information. */
 971                         seg_tailroom = (seg->buf_len - seg_headroom);
 972                         assert(sge->length == seg_tailroom);
 973                         SET_DATA_OFF(seg, seg_headroom);
 974                         if (likely(len <= seg_tailroom)) {
 975                                 /* Last segment. */
 976                                 DATA_LEN(seg) = len;
 977                                 PKT_LEN(seg) = len;
 978                                 /* Sanity check. */
 979                                 assert(rte_pktmbuf_headroom(seg) ==
 980                                        seg_headroom);
 981                                 assert(rte_pktmbuf_tailroom(seg) ==
 982                                        (seg_tailroom - len));
 983                                 break;
 984                         }
 985                         DATA_LEN(seg) = seg_tailroom;
 986                         PKT_LEN(seg) = seg_tailroom;
 987                         /* Sanity check. */
 988                         assert(rte_pktmbuf_headroom(seg) == seg_headroom);
 989                         assert(rte_pktmbuf_tailroom(seg) == 0);
 990                         /* Fix len and clear headroom for next segments. */
 991                         len -= seg_tailroom;
 992                         seg_headroom = 0;
 993                 }
 994                 /* Update head and tail segments. */
 995                 *pkt_buf_next = NULL;
 996                 assert(pkt_buf != NULL);
 997                 assert(j != 0);
 998                 NB_SEGS(pkt_buf) = j;
 999                 PORT(pkt_buf) = rxq->port_id;
1000                 PKT_LEN(pkt_buf) = pkt_buf_len;
1001                 if (rxq->csum | rxq->csum_l2tun | rxq->vlan_strip) {
1002                         pkt_buf->packet_type = rxq_cq_to_pkt_type(flags);
1003                         pkt_buf->ol_flags = rxq_cq_to_ol_flags(rxq, flags);
1004 #ifdef HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS
1005                         if (flags & IBV_EXP_CQ_RX_CVLAN_STRIPPED_V1) {
1006                                 pkt_buf->ol_flags |= PKT_RX_VLAN_PKT;
1007                                 pkt_buf->vlan_tci = vlan_tci;
1008                         }
1009 #endif /* HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS */
1010                 }
1011
1012                 /* Return packet. */
1013                 *(pkts++) = pkt_buf;
1014                 ++pkts_ret;
1015 #ifdef MLX5_PMD_SOFT_COUNTERS
1016                 /* Increment bytes counter. */
1017                 rxq->stats.ibytes += pkt_buf_len;
1018 #endif
1019 repost:
1020                 ret = rxq->recv(rxq->wq, elt->sges, RTE_DIM(elt->sges));
1021                 if (unlikely(ret)) {
1022                         /* Inability to repost WRs is fatal. */
1023                         DEBUG("%p: recv_sg_list(): failed (ret=%d)",
1024                               (void *)rxq->priv,
1025                               ret);
1026                         abort();
1027                 }
1028                 if (++elts_head >= elts_n)
1029                         elts_head = 0;
1030                 continue;
1031         }
1032         if (unlikely(i == 0))
1033                 return 0;
1034         rxq->elts_head = elts_head;
1035 #ifdef MLX5_PMD_SOFT_COUNTERS
1036         /* Increment packets counter. */
1037         rxq->stats.ipackets += pkts_ret;
1038 #endif
1039         return pkts_ret;
1040 }
1041
1042 /**
1043  * DPDK callback for RX.
1044  *
1045  * The following function is the same as mlx5_rx_burst_sp(), except it doesn't
1046  * manage scattered packets. Improves performance when MRU is lower than the
1047  * size of the first segment.
1048  *
1049  * @param dpdk_rxq
1050  *   Generic pointer to RX queue structure.
1051  * @param[out] pkts
1052  *   Array to store received packets.
1053  * @param pkts_n
1054  *   Maximum number of packets in array.
1055  *
1056  * @return
1057  *   Number of packets successfully received (<= pkts_n).
1058  */
1059 uint16_t
1060 mlx5_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
1061 {
1062         struct rxq *rxq = (struct rxq *)dpdk_rxq;
1063         struct rxq_elt (*elts)[rxq->elts_n] = rxq->elts.no_sp;
1064         const unsigned int elts_n = rxq->elts_n;
1065         unsigned int elts_head = rxq->elts_head;
1066         struct ibv_sge sges[pkts_n];
1067         unsigned int i;
1068         unsigned int pkts_ret = 0;
1069         int ret;
1070
1071         if (unlikely(rxq->sp))
1072                 return mlx5_rx_burst_sp(dpdk_rxq, pkts, pkts_n);
1073         for (i = 0; (i != pkts_n); ++i) {
1074                 struct rxq_elt *elt = &(*elts)[elts_head];
1075                 unsigned int len;
1076                 struct rte_mbuf *seg = elt->buf;
1077                 struct rte_mbuf *rep;
1078                 uint32_t flags;
1079                 uint16_t vlan_tci;
1080
1081                 /* Sanity checks. */
1082                 assert(seg != NULL);
1083                 assert(elts_head < rxq->elts_n);
1084                 assert(rxq->elts_head < rxq->elts_n);
1085                 /*
1086                  * Fetch initial bytes of packet descriptor into a
1087                  * cacheline while allocating rep.
1088                  */
1089                 rte_prefetch0(seg);
1090                 rte_prefetch0(&seg->cacheline1);
1091                 ret = rxq->poll(rxq->cq, NULL, NULL, &flags, &vlan_tci);
1092                 if (unlikely(ret < 0)) {
1093                         struct ibv_wc wc;
1094                         int wcs_n;
1095
1096                         DEBUG("rxq=%p, poll_length() failed (ret=%d)",
1097                               (void *)rxq, ret);
1098                         /* ibv_poll_cq() must be used in case of failure. */
1099                         wcs_n = ibv_poll_cq(rxq->cq, 1, &wc);
1100                         if (unlikely(wcs_n == 0))
1101                                 break;
1102                         if (unlikely(wcs_n < 0)) {
1103                                 DEBUG("rxq=%p, ibv_poll_cq() failed (wcs_n=%d)",
1104                                       (void *)rxq, wcs_n);
1105                                 break;
1106                         }
1107                         assert(wcs_n == 1);
1108                         if (unlikely(wc.status != IBV_WC_SUCCESS)) {
1109                                 /* Whatever, just repost the offending WR. */
1110                                 DEBUG("rxq=%p, wr_id=%" PRIu64 ": bad work"
1111                                       " completion status (%d): %s",
1112                                       (void *)rxq, wc.wr_id, wc.status,
1113                                       ibv_wc_status_str(wc.status));
1114 #ifdef MLX5_PMD_SOFT_COUNTERS
1115                                 /* Increment dropped packets counter. */
1116                                 ++rxq->stats.idropped;
1117 #endif
1118                                 /* Add SGE to array for repost. */
1119                                 sges[i] = elt->sge;
1120                                 goto repost;
1121                         }
1122                         ret = wc.byte_len;
1123                 }
1124                 if (ret == 0)
1125                         break;
1126                 assert(ret >= (rxq->crc_present << 2));
1127                 len = ret - (rxq->crc_present << 2);
1128                 rep = __rte_mbuf_raw_alloc(rxq->mp);
1129                 if (unlikely(rep == NULL)) {
1130                         /*
1131                          * Unable to allocate a replacement mbuf,
1132                          * repost WR.
1133                          */
1134                         DEBUG("rxq=%p: can't allocate a new mbuf",
1135                               (void *)rxq);
1136                         /* Increment out of memory counters. */
1137                         ++rxq->stats.rx_nombuf;
1138                         ++rxq->priv->dev->data->rx_mbuf_alloc_failed;
1139                         goto repost;
1140                 }
1141
1142                 /* Reconfigure sge to use rep instead of seg. */
1143                 elt->sge.addr = (uintptr_t)rep->buf_addr + RTE_PKTMBUF_HEADROOM;
1144                 assert(elt->sge.lkey == rxq->mr->lkey);
1145                 elt->buf = rep;
1146
1147                 /* Add SGE to array for repost. */
1148                 sges[i] = elt->sge;
1149
1150                 /* Update seg information. */
1151                 SET_DATA_OFF(seg, RTE_PKTMBUF_HEADROOM);
1152                 NB_SEGS(seg) = 1;
1153                 PORT(seg) = rxq->port_id;
1154                 NEXT(seg) = NULL;
1155                 PKT_LEN(seg) = len;
1156                 DATA_LEN(seg) = len;
1157                 if (rxq->csum | rxq->csum_l2tun | rxq->vlan_strip) {
1158                         seg->packet_type = rxq_cq_to_pkt_type(flags);
1159                         seg->ol_flags = rxq_cq_to_ol_flags(rxq, flags);
1160 #ifdef HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS
1161                         if (flags & IBV_EXP_CQ_RX_CVLAN_STRIPPED_V1) {
1162                                 seg->ol_flags |= PKT_RX_VLAN_PKT;
1163                                 seg->vlan_tci = vlan_tci;
1164                         }
1165 #endif /* HAVE_EXP_DEVICE_ATTR_VLAN_OFFLOADS */
1166                 }
1167                 /* Return packet. */
1168                 *(pkts++) = seg;
1169                 ++pkts_ret;
1170 #ifdef MLX5_PMD_SOFT_COUNTERS
1171                 /* Increment bytes counter. */
1172                 rxq->stats.ibytes += len;
1173 #endif
1174 repost:
1175                 if (++elts_head >= elts_n)
1176                         elts_head = 0;
1177                 continue;
1178         }
1179         if (unlikely(i == 0))
1180                 return 0;
1181         /* Repost WRs. */
1182 #ifdef DEBUG_RECV
1183         DEBUG("%p: reposting %u WRs", (void *)rxq, i);
1184 #endif
1185         ret = rxq->recv(rxq->wq, sges, i);
1186         if (unlikely(ret)) {
1187                 /* Inability to repost WRs is fatal. */
1188                 DEBUG("%p: recv_burst(): failed (ret=%d)",
1189                       (void *)rxq->priv,
1190                       ret);
1191                 abort();
1192         }
1193         rxq->elts_head = elts_head;
1194 #ifdef MLX5_PMD_SOFT_COUNTERS
1195         /* Increment packets counter. */
1196         rxq->stats.ipackets += pkts_ret;
1197 #endif
1198         return pkts_ret;
1199 }
1200
1201 /**
1202  * Dummy DPDK callback for TX.
1203  *
1204  * This function is used to temporarily replace the real callback during
1205  * unsafe control operations on the queue, or in case of error.
1206  *
1207  * @param dpdk_txq
1208  *   Generic pointer to TX queue structure.
1209  * @param[in] pkts
1210  *   Packets to transmit.
1211  * @param pkts_n
1212  *   Number of packets in array.
1213  *
1214  * @return
1215  *   Number of packets successfully transmitted (<= pkts_n).
1216  */
1217 uint16_t
1218 removed_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
1219 {
1220         (void)dpdk_txq;
1221         (void)pkts;
1222         (void)pkts_n;
1223         return 0;
1224 }
1225
1226 /**
1227  * Dummy DPDK callback for RX.
1228  *
1229  * This function is used to temporarily replace the real callback during
1230  * unsafe control operations on the queue, or in case of error.
1231  *
1232  * @param dpdk_rxq
1233  *   Generic pointer to RX queue structure.
1234  * @param[out] pkts
1235  *   Array to store received packets.
1236  * @param pkts_n
1237  *   Maximum number of packets in array.
1238  *
1239  * @return
1240  *   Number of packets successfully received (<= pkts_n).
1241  */
1242 uint16_t
1243 removed_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
1244 {
1245         (void)dpdk_rxq;
1246         (void)pkts;
1247         (void)pkts_n;
1248         return 0;
1249 }