drivers/net/sfc/sfc_rx.c

   1 /*-
   2  * Copyright (c) 2016 Solarflare Communications Inc.
   3  * All rights reserved.
   4  *
   5  * This software was jointly developed between OKTET Labs (under contract
   6  * for Solarflare) and Solarflare Communications, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright notice,
  14  *    this list of conditions and the following disclaimer in the documentation
  15  *    and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  27  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <rte_mempool.h>
  31
  32 #include "efx.h"
  33
  34 #include "sfc.h"
  35 #include "sfc_debug.h"
  36 #include "sfc_log.h"
  37 #include "sfc_ev.h"
  38 #include "sfc_rx.h"
  39 #include "sfc_tweak.h"
  40
  41 /*
  42  * Maximum number of Rx queue flush attempt in the case of failure or
  43  * flush timeout
  44  */
  45 #define SFC_RX_QFLUSH_ATTEMPTS          (3)
  46
  47 /*
  48  * Time to wait between event queue polling attempts when waiting for Rx
  49  * queue flush done or failed events.
  50  */
  51 #define SFC_RX_QFLUSH_POLL_WAIT_MS      (1)
  52
  53 /*
  54  * Maximum number of event queue polling attempts when waiting for Rx queue
  55  * flush done or failed events. It defines Rx queue flush attempt timeout
  56  * together with SFC_RX_QFLUSH_POLL_WAIT_MS.
  57  */
  58 #define SFC_RX_QFLUSH_POLL_ATTEMPTS     (2000)
  59
  60 void
  61 sfc_rx_qflush_done(struct sfc_rxq *rxq)
  62 {
  63         rxq->state |= SFC_RXQ_FLUSHED;
  64         rxq->state &= ~SFC_RXQ_FLUSHING;
  65 }
  66
  67 void
  68 sfc_rx_qflush_failed(struct sfc_rxq *rxq)
  69 {
  70         rxq->state |= SFC_RXQ_FLUSH_FAILED;
  71         rxq->state &= ~SFC_RXQ_FLUSHING;
  72 }
  73
  74 static void
  75 sfc_rx_qrefill(struct sfc_rxq *rxq)
  76 {
  77         unsigned int free_space;
  78         unsigned int bulks;
  79         void *objs[SFC_RX_REFILL_BULK];
  80         efsys_dma_addr_t addr[RTE_DIM(objs)];
  81         unsigned int added = rxq->added;
  82         unsigned int id;
  83         unsigned int i;
  84         struct sfc_rx_sw_desc *rxd;
  85         struct rte_mbuf *m;
  86         uint8_t port_id = rxq->port_id;
  87
  88         free_space = EFX_RXQ_LIMIT(rxq->ptr_mask + 1) -
  89                 (added - rxq->completed);
  90
  91         if (free_space < rxq->refill_threshold)
  92                 return;
  93
  94         bulks = free_space / RTE_DIM(objs);
  95
  96         id = added & rxq->ptr_mask;
  97         while (bulks-- > 0) {
  98                 if (rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
  99                                          RTE_DIM(objs)) < 0) {
 100                         /*
 101                          * It is hardly a safe way to increment counter
 102                          * from different contexts, but all PMDs do it.
 103                          */
 104                         rxq->evq->sa->eth_dev->data->rx_mbuf_alloc_failed +=
 105                                 RTE_DIM(objs);
 106                         break;
 107                 }
 108
 109                 for (i = 0; i < RTE_DIM(objs);
 110                      ++i, id = (id + 1) & rxq->ptr_mask) {
 111                         m = objs[i];
 112
 113                         rxd = &rxq->sw_desc[id];
 114                         rxd->mbuf = m;
 115
 116                         rte_mbuf_refcnt_set(m, 1);
 117                         m->data_off = RTE_PKTMBUF_HEADROOM;
 118                         m->next = NULL;
 119                         m->nb_segs = 1;
 120                         m->port = port_id;
 121
 122                         addr[i] = rte_pktmbuf_mtophys(m);
 123                 }
 124
 125                 efx_rx_qpost(rxq->common, addr, rxq->buf_size,
 126                              RTE_DIM(objs), rxq->completed, added);
 127                 added += RTE_DIM(objs);
 128         }
 129
 130         /* Push doorbell if something is posted */
 131         if (rxq->added != added) {
 132                 rxq->added = added;
 133                 efx_rx_qpush(rxq->common, added, &rxq->pushed);
 134         }
 135 }
 136
 137 static uint64_t
 138 sfc_rx_desc_flags_to_offload_flags(const unsigned int desc_flags)
 139 {
 140         uint64_t mbuf_flags = 0;
 141
 142         switch (desc_flags & (EFX_PKT_IPV4 | EFX_CKSUM_IPV4)) {
 143         case (EFX_PKT_IPV4 | EFX_CKSUM_IPV4):
 144                 mbuf_flags |= PKT_RX_IP_CKSUM_GOOD;
 145                 break;
 146         case EFX_PKT_IPV4:
 147                 mbuf_flags |= PKT_RX_IP_CKSUM_BAD;
 148                 break;
 149         default:
 150                 RTE_BUILD_BUG_ON(PKT_RX_IP_CKSUM_UNKNOWN != 0);
 151                 SFC_ASSERT((mbuf_flags & PKT_RX_IP_CKSUM_MASK) ==
 152                            PKT_RX_IP_CKSUM_UNKNOWN);
 153                 break;
 154         }
 155
 156         switch ((desc_flags &
 157                  (EFX_PKT_TCP | EFX_PKT_UDP | EFX_CKSUM_TCPUDP))) {
 158         case (EFX_PKT_TCP | EFX_CKSUM_TCPUDP):
 159         case (EFX_PKT_UDP | EFX_CKSUM_TCPUDP):
 160                 mbuf_flags |= PKT_RX_L4_CKSUM_GOOD;
 161                 break;
 162         case EFX_PKT_TCP:
 163         case EFX_PKT_UDP:
 164                 mbuf_flags |= PKT_RX_L4_CKSUM_BAD;
 165                 break;
 166         default:
 167                 RTE_BUILD_BUG_ON(PKT_RX_L4_CKSUM_UNKNOWN != 0);
 168                 SFC_ASSERT((mbuf_flags & PKT_RX_L4_CKSUM_MASK) ==
 169                            PKT_RX_L4_CKSUM_UNKNOWN);
 170                 break;
 171         }
 172
 173         return mbuf_flags;
 174 }
 175
 176 static uint32_t
 177 sfc_rx_desc_flags_to_packet_type(const unsigned int desc_flags)
 178 {
 179         return RTE_PTYPE_L2_ETHER |
 180                 ((desc_flags & EFX_PKT_IPV4) ?
 181                         RTE_PTYPE_L3_IPV4_EXT_UNKNOWN : 0) |
 182                 ((desc_flags & EFX_PKT_IPV6) ?
 183                         RTE_PTYPE_L3_IPV6_EXT_UNKNOWN : 0) |
 184                 ((desc_flags & EFX_PKT_TCP) ? RTE_PTYPE_L4_TCP : 0) |
 185                 ((desc_flags & EFX_PKT_UDP) ? RTE_PTYPE_L4_UDP : 0);
 186 }
 187
 188 static void
 189 sfc_rx_set_rss_hash(struct sfc_rxq *rxq, unsigned int flags, struct rte_mbuf *m)
 190 {
 191 #if EFSYS_OPT_RX_SCALE
 192         uint8_t *mbuf_data;
 193
 194
 195         if ((rxq->flags & SFC_RXQ_RSS_HASH) == 0)
 196                 return;
 197
 198         mbuf_data = rte_pktmbuf_mtod(m, uint8_t *);
 199
 200         if (flags & (EFX_PKT_IPV4 | EFX_PKT_IPV6)) {
 201                 m->hash.rss = efx_pseudo_hdr_hash_get(rxq->common,
 202                                                       EFX_RX_HASHALG_TOEPLITZ,
 203                                                       mbuf_data);
 204
 205                 m->ol_flags |= PKT_RX_RSS_HASH;
 206         }
 207 #endif
 208 }
 209
 210 uint16_t
 211 sfc_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 212 {
 213         struct sfc_rxq *rxq = rx_queue;
 214         unsigned int completed;
 215         unsigned int prefix_size = rxq->prefix_size;
 216         unsigned int done_pkts = 0;
 217         boolean_t discard_next = B_FALSE;
 218         struct rte_mbuf *scatter_pkt = NULL;
 219
 220         if (unlikely((rxq->state & SFC_RXQ_RUNNING) == 0))
 221                 return 0;
 222
 223         sfc_ev_qpoll(rxq->evq);
 224
 225         completed = rxq->completed;
 226         while (completed != rxq->pending && done_pkts < nb_pkts) {
 227                 unsigned int id;
 228                 struct sfc_rx_sw_desc *rxd;
 229                 struct rte_mbuf *m;
 230                 unsigned int seg_len;
 231                 unsigned int desc_flags;
 232
 233                 id = completed++ & rxq->ptr_mask;
 234                 rxd = &rxq->sw_desc[id];
 235                 m = rxd->mbuf;
 236                 desc_flags = rxd->flags;
 237
 238                 if (discard_next)
 239                         goto discard;
 240
 241                 if (desc_flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))
 242                         goto discard;
 243
 244                 if (desc_flags & EFX_PKT_PREFIX_LEN) {
 245                         uint16_t tmp_size;
 246                         int rc __rte_unused;
 247
 248                         rc = efx_pseudo_hdr_pkt_length_get(rxq->common,
 249                                 rte_pktmbuf_mtod(m, uint8_t *), &tmp_size);
 250                         SFC_ASSERT(rc == 0);
 251                         seg_len = tmp_size;
 252                 } else {
 253                         seg_len = rxd->size - prefix_size;
 254                 }
 255
 256                 rte_pktmbuf_data_len(m) = seg_len;
 257                 rte_pktmbuf_pkt_len(m) = seg_len;
 258
 259                 if (scatter_pkt != NULL) {
 260                         if (rte_pktmbuf_chain(scatter_pkt, m) != 0) {
 261                                 rte_mempool_put(rxq->refill_mb_pool,
 262                                                 scatter_pkt);
 263                                 goto discard;
 264                         }
 265                         /* The packet to deliver */
 266                         m = scatter_pkt;
 267                 }
 268
 269                 if (desc_flags & EFX_PKT_CONT) {
 270                         /* The packet is scattered, more fragments to come */
 271                         scatter_pkt = m;
 272                         /* Futher fragments have no prefix */
 273                         prefix_size = 0;
 274                         continue;
 275                 }
 276
 277                 /* Scattered packet is done */
 278                 scatter_pkt = NULL;
 279                 /* The first fragment of the packet has prefix */
 280                 prefix_size = rxq->prefix_size;
 281
 282                 m->ol_flags = sfc_rx_desc_flags_to_offload_flags(desc_flags);
 283                 m->packet_type = sfc_rx_desc_flags_to_packet_type(desc_flags);
 284
 285                 /*
 286                  * Extract RSS hash from the packet prefix and
 287                  * set the corresponding field (if needed and possible)
 288                  */
 289                 sfc_rx_set_rss_hash(rxq, desc_flags, m);
 290
 291                 m->data_off += prefix_size;
 292
 293                 *rx_pkts++ = m;
 294                 done_pkts++;
 295                 continue;
 296
 297 discard:
 298                 discard_next = ((desc_flags & EFX_PKT_CONT) != 0);
 299                 rte_mempool_put(rxq->refill_mb_pool, m);
 300                 rxd->mbuf = NULL;
 301         }
 302
 303         /* pending is only moved when entire packet is received */
 304         SFC_ASSERT(scatter_pkt == NULL);
 305
 306         rxq->completed = completed;
 307
 308         sfc_rx_qrefill(rxq);
 309
 310         return done_pkts;
 311 }
 312
 313 unsigned int
 314 sfc_rx_qdesc_npending(struct sfc_adapter *sa, unsigned int sw_index)
 315 {
 316         struct sfc_rxq *rxq;
 317
 318         SFC_ASSERT(sw_index < sa->rxq_count);
 319         rxq = sa->rxq_info[sw_index].rxq;
 320
 321         if (rxq == NULL || (rxq->state & SFC_RXQ_RUNNING) == 0)
 322                 return 0;
 323
 324         sfc_ev_qpoll(rxq->evq);
 325
 326         return rxq->pending - rxq->completed;
 327 }
 328
 329 int
 330 sfc_rx_qdesc_done(struct sfc_rxq *rxq, unsigned int offset)
 331 {
 332         if ((rxq->state & SFC_RXQ_RUNNING) == 0)
 333                 return 0;
 334
 335         sfc_ev_qpoll(rxq->evq);
 336
 337         return offset < (rxq->pending - rxq->completed);
 338 }
 339
 340 static void
 341 sfc_rx_qpurge(struct sfc_rxq *rxq)
 342 {
 343         unsigned int i;
 344         struct sfc_rx_sw_desc *rxd;
 345
 346         for (i = rxq->completed; i != rxq->added; ++i) {
 347                 rxd = &rxq->sw_desc[i & rxq->ptr_mask];
 348                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
 349                 rxd->mbuf = NULL;
 350         }
 351 }
 352
 353 static void
 354 sfc_rx_qflush(struct sfc_adapter *sa, unsigned int sw_index)
 355 {
 356         struct sfc_rxq *rxq;
 357         unsigned int retry_count;
 358         unsigned int wait_count;
 359
 360         rxq = sa->rxq_info[sw_index].rxq;
 361         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 362
 363         /*
 364          * Retry Rx queue flushing in the case of flush failed or
 365          * timeout. In the worst case it can delay for 6 seconds.
 366          */
 367         for (retry_count = 0;
 368              ((rxq->state & SFC_RXQ_FLUSHED) == 0) &&
 369              (retry_count < SFC_RX_QFLUSH_ATTEMPTS);
 370              ++retry_count) {
 371                 if (efx_rx_qflush(rxq->common) != 0) {
 372                         rxq->state |= SFC_RXQ_FLUSH_FAILED;
 373                         break;
 374                 }
 375                 rxq->state &= ~SFC_RXQ_FLUSH_FAILED;
 376                 rxq->state |= SFC_RXQ_FLUSHING;
 377
 378                 /*
 379                  * Wait for Rx queue flush done or failed event at least
 380                  * SFC_RX_QFLUSH_POLL_WAIT_MS milliseconds and not more
 381                  * than 2 seconds (SFC_RX_QFLUSH_POLL_WAIT_MS multiplied
 382                  * by SFC_RX_QFLUSH_POLL_ATTEMPTS).
 383                  */
 384                 wait_count = 0;
 385                 do {
 386                         rte_delay_ms(SFC_RX_QFLUSH_POLL_WAIT_MS);
 387                         sfc_ev_qpoll(rxq->evq);
 388                 } while ((rxq->state & SFC_RXQ_FLUSHING) &&
 389                          (wait_count++ < SFC_RX_QFLUSH_POLL_ATTEMPTS));
 390
 391                 if (rxq->state & SFC_RXQ_FLUSHING)
 392                         sfc_err(sa, "RxQ %u flush timed out", sw_index);
 393
 394                 if (rxq->state & SFC_RXQ_FLUSH_FAILED)
 395                         sfc_err(sa, "RxQ %u flush failed", sw_index);
 396
 397                 if (rxq->state & SFC_RXQ_FLUSHED)
 398                         sfc_info(sa, "RxQ %u flushed", sw_index);
 399         }
 400
 401         sfc_rx_qpurge(rxq);
 402 }
 403
 404 int
 405 sfc_rx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
 406 {
 407         struct sfc_rxq_info *rxq_info;
 408         struct sfc_rxq *rxq;
 409         struct sfc_evq *evq;
 410         int rc;
 411
 412         sfc_log_init(sa, "sw_index=%u", sw_index);
 413
 414         SFC_ASSERT(sw_index < sa->rxq_count);
 415
 416         rxq_info = &sa->rxq_info[sw_index];
 417         rxq = rxq_info->rxq;
 418         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 419
 420         evq = rxq->evq;
 421
 422         rc = sfc_ev_qstart(sa, evq->evq_index);
 423         if (rc != 0)
 424                 goto fail_ev_qstart;
 425
 426         rc = efx_rx_qcreate(sa->nic, rxq->hw_index, 0, rxq_info->type,
 427                             &rxq->mem, rxq_info->entries,
 428                             0 /* not used on EF10 */, evq->common,
 429                             &rxq->common);
 430         if (rc != 0)
 431                 goto fail_rx_qcreate;
 432
 433         efx_rx_qenable(rxq->common);
 434
 435         rxq->pending = rxq->completed = rxq->added = rxq->pushed = 0;
 436
 437         rxq->state |= (SFC_RXQ_STARTED | SFC_RXQ_RUNNING);
 438
 439         sfc_rx_qrefill(rxq);
 440
 441         if (sw_index == 0) {
 442                 rc = efx_mac_filter_default_rxq_set(sa->nic, rxq->common,
 443                                                     (sa->rss_channels > 1) ?
 444                                                     B_TRUE : B_FALSE);
 445                 if (rc != 0)
 446                         goto fail_mac_filter_default_rxq_set;
 447         }
 448
 449         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 450         sa->eth_dev->data->rx_queue_state[sw_index] =
 451                 RTE_ETH_QUEUE_STATE_STARTED;
 452
 453         return 0;
 454
 455 fail_mac_filter_default_rxq_set:
 456         sfc_rx_qflush(sa, sw_index);
 457
 458 fail_rx_qcreate:
 459         sfc_ev_qstop(sa, evq->evq_index);
 460
 461 fail_ev_qstart:
 462         return rc;
 463 }
 464
 465 void
 466 sfc_rx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
 467 {
 468         struct sfc_rxq_info *rxq_info;
 469         struct sfc_rxq *rxq;
 470
 471         sfc_log_init(sa, "sw_index=%u", sw_index);
 472
 473         SFC_ASSERT(sw_index < sa->rxq_count);
 474
 475         rxq_info = &sa->rxq_info[sw_index];
 476         rxq = rxq_info->rxq;
 477
 478         if (rxq->state == SFC_RXQ_INITIALIZED)
 479                 return;
 480         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 481
 482         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 483         sa->eth_dev->data->rx_queue_state[sw_index] =
 484                 RTE_ETH_QUEUE_STATE_STOPPED;
 485
 486         rxq->state &= ~SFC_RXQ_RUNNING;
 487
 488         if (sw_index == 0)
 489                 efx_mac_filter_default_rxq_clear(sa->nic);
 490
 491         sfc_rx_qflush(sa, sw_index);
 492
 493         rxq->state = SFC_RXQ_INITIALIZED;
 494
 495         efx_rx_qdestroy(rxq->common);
 496
 497         sfc_ev_qstop(sa, rxq->evq->evq_index);
 498 }
 499
 500 static int
 501 sfc_rx_qcheck_conf(struct sfc_adapter *sa, uint16_t nb_rx_desc,
 502                    const struct rte_eth_rxconf *rx_conf)
 503 {
 504         const uint16_t rx_free_thresh_max = EFX_RXQ_LIMIT(nb_rx_desc);
 505         int rc = 0;
 506
 507         if (rx_conf->rx_thresh.pthresh != 0 ||
 508             rx_conf->rx_thresh.hthresh != 0 ||
 509             rx_conf->rx_thresh.wthresh != 0) {
 510                 sfc_err(sa,
 511                         "RxQ prefetch/host/writeback thresholds are not supported");
 512                 rc = EINVAL;
 513         }
 514
 515         if (rx_conf->rx_free_thresh > rx_free_thresh_max) {
 516                 sfc_err(sa,
 517                         "RxQ free threshold too large: %u vs maximum %u",
 518                         rx_conf->rx_free_thresh, rx_free_thresh_max);
 519                 rc = EINVAL;
 520         }
 521
 522         if (rx_conf->rx_drop_en == 0) {
 523                 sfc_err(sa, "RxQ drop disable is not supported");
 524                 rc = EINVAL;
 525         }
 526
 527         return rc;
 528 }
 529
 530 static unsigned int
 531 sfc_rx_mbuf_data_alignment(struct rte_mempool *mb_pool)
 532 {
 533         uint32_t data_off;
 534         uint32_t order;
 535
 536         /* The mbuf object itself is always cache line aligned */
 537         order = rte_bsf32(RTE_CACHE_LINE_SIZE);
 538
 539         /* Data offset from mbuf object start */
 540         data_off = sizeof(struct rte_mbuf) + rte_pktmbuf_priv_size(mb_pool) +
 541                 RTE_PKTMBUF_HEADROOM;
 542
 543         order = MIN(order, rte_bsf32(data_off));
 544
 545         return 1u << (order - 1);
 546 }
 547
 548 static uint16_t
 549 sfc_rx_mb_pool_buf_size(struct sfc_adapter *sa, struct rte_mempool *mb_pool)
 550 {
 551         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 552         const uint32_t nic_align_start = MAX(1, encp->enc_rx_buf_align_start);
 553         const uint32_t nic_align_end = MAX(1, encp->enc_rx_buf_align_end);
 554         uint16_t buf_size;
 555         unsigned int buf_aligned;
 556         unsigned int start_alignment;
 557         unsigned int end_padding_alignment;
 558
 559         /* Below it is assumed that both alignments are power of 2 */
 560         SFC_ASSERT(rte_is_power_of_2(nic_align_start));
 561         SFC_ASSERT(rte_is_power_of_2(nic_align_end));
 562
 563         /*
 564          * mbuf is always cache line aligned, double-check
 565          * that it meets rx buffer start alignment requirements.
 566          */
 567
 568         /* Start from mbuf pool data room size */
 569         buf_size = rte_pktmbuf_data_room_size(mb_pool);
 570
 571         /* Remove headroom */
 572         if (buf_size <= RTE_PKTMBUF_HEADROOM) {
 573                 sfc_err(sa,
 574                         "RxQ mbuf pool %s object data room size %u is smaller than headroom %u",
 575                         mb_pool->name, buf_size, RTE_PKTMBUF_HEADROOM);
 576                 return 0;
 577         }
 578         buf_size -= RTE_PKTMBUF_HEADROOM;
 579
 580         /* Calculate guaranteed data start alignment */
 581         buf_aligned = sfc_rx_mbuf_data_alignment(mb_pool);
 582
 583         /* Reserve space for start alignment */
 584         if (buf_aligned < nic_align_start) {
 585                 start_alignment = nic_align_start - buf_aligned;
 586                 if (buf_size <= start_alignment) {
 587                         sfc_err(sa,
 588                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u and buffer start alignment %u required by NIC",
 589                                 mb_pool->name,
 590                                 rte_pktmbuf_data_room_size(mb_pool),
 591                                 RTE_PKTMBUF_HEADROOM, start_alignment);
 592                         return 0;
 593                 }
 594                 buf_aligned = nic_align_start;
 595                 buf_size -= start_alignment;
 596         } else {
 597                 start_alignment = 0;
 598         }
 599
 600         /* Make sure that end padding does not write beyond the buffer */
 601         if (buf_aligned < nic_align_end) {
 602                 /*
 603                  * Estimate space which can be lost. If guarnteed buffer
 604                  * size is odd, lost space is (nic_align_end - 1). More
 605                  * accurate formula is below.
 606                  */
 607                 end_padding_alignment = nic_align_end -
 608                         MIN(buf_aligned, 1u << (rte_bsf32(buf_size) - 1));
 609                 if (buf_size <= end_padding_alignment) {
 610                         sfc_err(sa,
 611                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u, buffer start alignment %u and end padding alignment %u required by NIC",
 612                                 mb_pool->name,
 613                                 rte_pktmbuf_data_room_size(mb_pool),
 614                                 RTE_PKTMBUF_HEADROOM, start_alignment,
 615                                 end_padding_alignment);
 616                         return 0;
 617                 }
 618                 buf_size -= end_padding_alignment;
 619         } else {
 620                 /*
 621                  * Start is aligned the same or better than end,
 622                  * just align length.
 623                  */
 624                 buf_size = P2ALIGN(buf_size, nic_align_end);
 625         }
 626
 627         return buf_size;
 628 }
 629
 630 int
 631 sfc_rx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
 632              uint16_t nb_rx_desc, unsigned int socket_id,
 633              const struct rte_eth_rxconf *rx_conf,
 634              struct rte_mempool *mb_pool)
 635 {
 636         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 637         int rc;
 638         uint16_t buf_size;
 639         struct sfc_rxq_info *rxq_info;
 640         unsigned int evq_index;
 641         struct sfc_evq *evq;
 642         struct sfc_rxq *rxq;
 643
 644         rc = sfc_rx_qcheck_conf(sa, nb_rx_desc, rx_conf);
 645         if (rc != 0)
 646                 goto fail_bad_conf;
 647
 648         buf_size = sfc_rx_mb_pool_buf_size(sa, mb_pool);
 649         if (buf_size == 0) {
 650                 sfc_err(sa, "RxQ %u mbuf pool object size is too small",
 651                         sw_index);
 652                 rc = EINVAL;
 653                 goto fail_bad_conf;
 654         }
 655
 656         if ((buf_size < sa->port.pdu + encp->enc_rx_prefix_size) &&
 657             !sa->eth_dev->data->dev_conf.rxmode.enable_scatter) {
 658                 sfc_err(sa, "Rx scatter is disabled and RxQ %u mbuf pool "
 659                         "object size is too small", sw_index);
 660                 sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
 661                         "PDU size %u plus Rx prefix %u bytes",
 662                         sw_index, buf_size, (unsigned int)sa->port.pdu,
 663                         encp->enc_rx_prefix_size);
 664                 rc = EINVAL;
 665                 goto fail_bad_conf;
 666         }
 667
 668         SFC_ASSERT(sw_index < sa->rxq_count);
 669         rxq_info = &sa->rxq_info[sw_index];
 670
 671         SFC_ASSERT(nb_rx_desc <= rxq_info->max_entries);
 672         rxq_info->entries = nb_rx_desc;
 673         rxq_info->type =
 674                 sa->eth_dev->data->dev_conf.rxmode.enable_scatter ?
 675                 EFX_RXQ_TYPE_SCATTER : EFX_RXQ_TYPE_DEFAULT;
 676
 677         evq_index = sfc_evq_index_by_rxq_sw_index(sa, sw_index);
 678
 679         rc = sfc_ev_qinit(sa, evq_index, rxq_info->entries, socket_id);
 680         if (rc != 0)
 681                 goto fail_ev_qinit;
 682
 683         evq = sa->evq_info[evq_index].evq;
 684
 685         rc = ENOMEM;
 686         rxq = rte_zmalloc_socket("sfc-rxq", sizeof(*rxq), RTE_CACHE_LINE_SIZE,
 687                                  socket_id);
 688         if (rxq == NULL)
 689                 goto fail_rxq_alloc;
 690
 691         rc = sfc_dma_alloc(sa, "rxq", sw_index, EFX_RXQ_SIZE(rxq_info->entries),
 692                            socket_id, &rxq->mem);
 693         if (rc != 0)
 694                 goto fail_dma_alloc;
 695
 696         rc = ENOMEM;
 697         rxq->sw_desc = rte_calloc_socket("sfc-rxq-sw_desc", rxq_info->entries,
 698                                          sizeof(*rxq->sw_desc),
 699                                          RTE_CACHE_LINE_SIZE, socket_id);
 700         if (rxq->sw_desc == NULL)
 701                 goto fail_desc_alloc;
 702
 703         evq->rxq = rxq;
 704         rxq->evq = evq;
 705         rxq->ptr_mask = rxq_info->entries - 1;
 706         rxq->refill_threshold = rx_conf->rx_free_thresh;
 707         rxq->refill_mb_pool = mb_pool;
 708         rxq->buf_size = buf_size;
 709         rxq->hw_index = sw_index;
 710         rxq->port_id = sa->eth_dev->data->port_id;
 711
 712         /* Cache limits required on datapath in RxQ structure */
 713         rxq->batch_max = encp->enc_rx_batch_max;
 714         rxq->prefix_size = encp->enc_rx_prefix_size;
 715
 716 #if EFSYS_OPT_RX_SCALE
 717         if (sa->hash_support == EFX_RX_HASH_AVAILABLE)
 718                 rxq->flags |= SFC_RXQ_RSS_HASH;
 719 #endif
 720
 721         rxq->state = SFC_RXQ_INITIALIZED;
 722
 723         rxq_info->rxq = rxq;
 724         rxq_info->deferred_start = (rx_conf->rx_deferred_start != 0);
 725
 726         return 0;
 727
 728 fail_desc_alloc:
 729         sfc_dma_free(sa, &rxq->mem);
 730
 731 fail_dma_alloc:
 732         rte_free(rxq);
 733
 734 fail_rxq_alloc:
 735         sfc_ev_qfini(sa, evq_index);
 736
 737 fail_ev_qinit:
 738         rxq_info->entries = 0;
 739
 740 fail_bad_conf:
 741         sfc_log_init(sa, "failed %d", rc);
 742         return rc;
 743 }
 744
 745 void
 746 sfc_rx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
 747 {
 748         struct sfc_rxq_info *rxq_info;
 749         struct sfc_rxq *rxq;
 750
 751         SFC_ASSERT(sw_index < sa->rxq_count);
 752
 753         rxq_info = &sa->rxq_info[sw_index];
 754
 755         rxq = rxq_info->rxq;
 756         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 757
 758         rxq_info->rxq = NULL;
 759         rxq_info->entries = 0;
 760
 761         rte_free(rxq->sw_desc);
 762         sfc_dma_free(sa, &rxq->mem);
 763         rte_free(rxq);
 764 }
 765
 766 #if EFSYS_OPT_RX_SCALE
 767 efx_rx_hash_type_t
 768 sfc_rte_to_efx_hash_type(uint64_t rss_hf)
 769 {
 770         efx_rx_hash_type_t efx_hash_types = 0;
 771
 772         if ((rss_hf & (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
 773                        ETH_RSS_NONFRAG_IPV4_OTHER)) != 0)
 774                 efx_hash_types |= EFX_RX_HASH_IPV4;
 775
 776         if ((rss_hf & ETH_RSS_NONFRAG_IPV4_TCP) != 0)
 777                 efx_hash_types |= EFX_RX_HASH_TCPIPV4;
 778
 779         if ((rss_hf & (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
 780                         ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX)) != 0)
 781                 efx_hash_types |= EFX_RX_HASH_IPV6;
 782
 783         if ((rss_hf & (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX)) != 0)
 784                 efx_hash_types |= EFX_RX_HASH_TCPIPV6;
 785
 786         return efx_hash_types;
 787 }
 788 #endif
 789
 790 static int
 791 sfc_rx_rss_config(struct sfc_adapter *sa)
 792 {
 793         int rc = 0;
 794
 795 #if EFSYS_OPT_RX_SCALE
 796         if (sa->rss_channels > 1) {
 797                 rc = efx_rx_scale_mode_set(sa->nic, EFX_RX_HASHALG_TOEPLITZ,
 798                                            sa->rss_hash_types, B_TRUE);
 799                 if (rc != 0)
 800                         goto finish;
 801
 802                 rc = efx_rx_scale_key_set(sa->nic, sa->rss_key,
 803                                           sizeof(sa->rss_key));
 804                 if (rc != 0)
 805                         goto finish;
 806
 807                 rc = efx_rx_scale_tbl_set(sa->nic, sa->rss_tbl,
 808                                           sizeof(sa->rss_tbl));
 809         }
 810
 811 finish:
 812 #endif
 813         return rc;
 814 }
 815
 816 int
 817 sfc_rx_start(struct sfc_adapter *sa)
 818 {
 819         unsigned int sw_index;
 820         int rc;
 821
 822         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 823
 824         rc = efx_rx_init(sa->nic);
 825         if (rc != 0)
 826                 goto fail_rx_init;
 827
 828         rc = sfc_rx_rss_config(sa);
 829         if (rc != 0)
 830                 goto fail_rss_config;
 831
 832         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
 833                 if ((!sa->rxq_info[sw_index].deferred_start ||
 834                      sa->rxq_info[sw_index].deferred_started)) {
 835                         rc = sfc_rx_qstart(sa, sw_index);
 836                         if (rc != 0)
 837                                 goto fail_rx_qstart;
 838                 }
 839         }
 840
 841         return 0;
 842
 843 fail_rx_qstart:
 844         while (sw_index-- > 0)
 845                 sfc_rx_qstop(sa, sw_index);
 846
 847 fail_rss_config:
 848         efx_rx_fini(sa->nic);
 849
 850 fail_rx_init:
 851         sfc_log_init(sa, "failed %d", rc);
 852         return rc;
 853 }
 854
 855 void
 856 sfc_rx_stop(struct sfc_adapter *sa)
 857 {
 858         unsigned int sw_index;
 859
 860         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 861
 862         sw_index = sa->rxq_count;
 863         while (sw_index-- > 0) {
 864                 if (sa->rxq_info[sw_index].rxq != NULL)
 865                         sfc_rx_qstop(sa, sw_index);
 866         }
 867
 868         efx_rx_fini(sa->nic);
 869 }
 870
 871 static int
 872 sfc_rx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
 873 {
 874         struct sfc_rxq_info *rxq_info = &sa->rxq_info[sw_index];
 875         unsigned int max_entries;
 876
 877         max_entries = EFX_RXQ_MAXNDESCS;
 878         SFC_ASSERT(rte_is_power_of_2(max_entries));
 879
 880         rxq_info->max_entries = max_entries;
 881
 882         return 0;
 883 }
 884
 885 static int
 886 sfc_rx_check_mode(struct sfc_adapter *sa, struct rte_eth_rxmode *rxmode)
 887 {
 888         int rc = 0;
 889
 890         switch (rxmode->mq_mode) {
 891         case ETH_MQ_RX_NONE:
 892                 /* No special checks are required */
 893                 break;
 894 #if EFSYS_OPT_RX_SCALE
 895         case ETH_MQ_RX_RSS:
 896                 if (sa->rss_support == EFX_RX_SCALE_UNAVAILABLE) {
 897                         sfc_err(sa, "RSS is not available");
 898                         rc = EINVAL;
 899                 }
 900                 break;
 901 #endif
 902         default:
 903                 sfc_err(sa, "Rx multi-queue mode %u not supported",
 904                         rxmode->mq_mode);
 905                 rc = EINVAL;
 906         }
 907
 908         if (rxmode->header_split) {
 909                 sfc_err(sa, "Header split on Rx not supported");
 910                 rc = EINVAL;
 911         }
 912
 913         if (rxmode->hw_vlan_filter) {
 914                 sfc_err(sa, "HW VLAN filtering not supported");
 915                 rc = EINVAL;
 916         }
 917
 918         if (rxmode->hw_vlan_strip) {
 919                 sfc_err(sa, "HW VLAN stripping not supported");
 920                 rc = EINVAL;
 921         }
 922
 923         if (rxmode->hw_vlan_extend) {
 924                 sfc_err(sa,
 925                         "Q-in-Q HW VLAN stripping not supported");
 926                 rc = EINVAL;
 927         }
 928
 929         if (!rxmode->hw_strip_crc) {
 930                 sfc_warn(sa,
 931                          "FCS stripping control not supported - always stripped");
 932                 rxmode->hw_strip_crc = 1;
 933         }
 934
 935         if (rxmode->enable_lro) {
 936                 sfc_err(sa, "LRO not supported");
 937                 rc = EINVAL;
 938         }
 939
 940         return rc;
 941 }
 942
 943 /**
 944  * Initialize Rx subsystem.
 945  *
 946  * Called at device configuration stage when number of receive queues is
 947  * specified together with other device level receive configuration.
 948  *
 949  * It should be used to allocate NUMA-unaware resources.
 950  */
 951 int
 952 sfc_rx_init(struct sfc_adapter *sa)
 953 {
 954         struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
 955         unsigned int sw_index;
 956         int rc;
 957
 958         rc = sfc_rx_check_mode(sa, &dev_conf->rxmode);
 959         if (rc != 0)
 960                 goto fail_check_mode;
 961
 962         sa->rxq_count = sa->eth_dev->data->nb_rx_queues;
 963
 964         rc = ENOMEM;
 965         sa->rxq_info = rte_calloc_socket("sfc-rxqs", sa->rxq_count,
 966                                          sizeof(struct sfc_rxq_info), 0,
 967                                          sa->socket_id);
 968         if (sa->rxq_info == NULL)
 969                 goto fail_rxqs_alloc;
 970
 971         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
 972                 rc = sfc_rx_qinit_info(sa, sw_index);
 973                 if (rc != 0)
 974                         goto fail_rx_qinit_info;
 975         }
 976
 977 #if EFSYS_OPT_RX_SCALE
 978         sa->rss_channels = (dev_conf->rxmode.mq_mode == ETH_MQ_RX_RSS) ?
 979                            MIN(sa->rxq_count, EFX_MAXRSS) : 1;
 980
 981         if (sa->rss_channels > 1) {
 982                 for (sw_index = 0; sw_index < EFX_RSS_TBL_SIZE; ++sw_index)
 983                         sa->rss_tbl[sw_index] = sw_index % sa->rss_channels;
 984         }
 985 #endif
 986
 987         return 0;
 988
 989 fail_rx_qinit_info:
 990         rte_free(sa->rxq_info);
 991         sa->rxq_info = NULL;
 992
 993 fail_rxqs_alloc:
 994         sa->rxq_count = 0;
 995 fail_check_mode:
 996         sfc_log_init(sa, "failed %d", rc);
 997         return rc;
 998 }
 999
1000 /**
1001  * Shutdown Rx subsystem.
1002  *
1003  * Called at device close stage, for example, before device
1004  * reconfiguration or shutdown.
1005  */
1006 void
1007 sfc_rx_fini(struct sfc_adapter *sa)
1008 {
1009         unsigned int sw_index;
1010
1011         sw_index = sa->rxq_count;
1012         while (sw_index-- > 0) {
1013                 if (sa->rxq_info[sw_index].rxq != NULL)
1014                         sfc_rx_qfini(sa, sw_index);
1015         }
1016
1017         rte_free(sa->rxq_info);
1018         sa->rxq_info = NULL;
1019         sa->rxq_count = 0;
1020 }