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