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