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         bulks = free_space / RTE_DIM(objs);
  91
  92         id = added & rxq->ptr_mask;
  93         while (bulks-- > 0) {
  94                 if (rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
  95                                          RTE_DIM(objs)) < 0) {
  96                         /*
  97                          * It is hardly a safe way to increment counter
  98                          * from different contexts, but all PMDs do it.
  99                          */
 100                         rxq->evq->sa->eth_dev->data->rx_mbuf_alloc_failed +=
 101                                 RTE_DIM(objs);
 102                         break;
 103                 }
 104
 105                 for (i = 0; i < RTE_DIM(objs);
 106                      ++i, id = (id + 1) & rxq->ptr_mask) {
 107                         m = objs[i];
 108
 109                         rxd = &rxq->sw_desc[id];
 110                         rxd->mbuf = m;
 111
 112                         rte_mbuf_refcnt_set(m, 1);
 113                         m->data_off = RTE_PKTMBUF_HEADROOM;
 114                         m->next = NULL;
 115                         m->nb_segs = 1;
 116                         m->port = port_id;
 117
 118                         addr[i] = rte_pktmbuf_mtophys(m);
 119                 }
 120
 121                 efx_rx_qpost(rxq->common, addr, rxq->buf_size,
 122                              RTE_DIM(objs), rxq->completed, added);
 123                 added += RTE_DIM(objs);
 124         }
 125
 126         /* Push doorbell if something is posted */
 127         if (rxq->added != added) {
 128                 rxq->added = added;
 129                 efx_rx_qpush(rxq->common, added, &rxq->pushed);
 130         }
 131 }
 132
 133 uint16_t
 134 sfc_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 135 {
 136         struct sfc_rxq *rxq = rx_queue;
 137         unsigned int completed;
 138         unsigned int prefix_size = rxq->prefix_size;
 139         unsigned int done_pkts = 0;
 140
 141         if (unlikely((rxq->state & SFC_RXQ_RUNNING) == 0))
 142                 return 0;
 143
 144         sfc_ev_qpoll(rxq->evq);
 145
 146         completed = rxq->completed;
 147         while (completed != rxq->pending && done_pkts < nb_pkts) {
 148                 unsigned int id;
 149                 struct sfc_rx_sw_desc *rxd;
 150                 struct rte_mbuf *m;
 151                 unsigned int seg_len;
 152                 unsigned int desc_flags;
 153
 154                 id = completed++ & rxq->ptr_mask;
 155                 rxd = &rxq->sw_desc[id];
 156                 m = rxd->mbuf;
 157                 desc_flags = rxd->flags;
 158
 159                 if (desc_flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))
 160                         goto discard;
 161
 162                 if (desc_flags & EFX_PKT_PREFIX_LEN) {
 163                         uint16_t tmp_size;
 164                         int rc __rte_unused;
 165
 166                         rc = efx_pseudo_hdr_pkt_length_get(rxq->common,
 167                                 rte_pktmbuf_mtod(m, uint8_t *), &tmp_size);
 168                         SFC_ASSERT(rc == 0);
 169                         seg_len = tmp_size;
 170                 } else {
 171                         seg_len = rxd->size - prefix_size;
 172                 }
 173
 174                 m->data_off += prefix_size;
 175                 rte_pktmbuf_data_len(m) = seg_len;
 176                 rte_pktmbuf_pkt_len(m) = seg_len;
 177
 178                 m->packet_type = RTE_PTYPE_L2_ETHER;
 179
 180                 *rx_pkts++ = m;
 181                 done_pkts++;
 182                 continue;
 183
 184 discard:
 185                 rte_mempool_put(rxq->refill_mb_pool, m);
 186                 rxd->mbuf = NULL;
 187         }
 188
 189         rxq->completed = completed;
 190
 191         sfc_rx_qrefill(rxq);
 192
 193         return done_pkts;
 194 }
 195
 196 static void
 197 sfc_rx_qpurge(struct sfc_rxq *rxq)
 198 {
 199         unsigned int i;
 200         struct sfc_rx_sw_desc *rxd;
 201
 202         for (i = rxq->completed; i != rxq->added; ++i) {
 203                 rxd = &rxq->sw_desc[i & rxq->ptr_mask];
 204                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
 205                 rxd->mbuf = NULL;
 206         }
 207 }
 208
 209 static void
 210 sfc_rx_qflush(struct sfc_adapter *sa, unsigned int sw_index)
 211 {
 212         struct sfc_rxq *rxq;
 213         unsigned int retry_count;
 214         unsigned int wait_count;
 215
 216         rxq = sa->rxq_info[sw_index].rxq;
 217         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 218
 219         /*
 220          * Retry Rx queue flushing in the case of flush failed or
 221          * timeout. In the worst case it can delay for 6 seconds.
 222          */
 223         for (retry_count = 0;
 224              ((rxq->state & SFC_RXQ_FLUSHED) == 0) &&
 225              (retry_count < SFC_RX_QFLUSH_ATTEMPTS);
 226              ++retry_count) {
 227                 if (efx_rx_qflush(rxq->common) != 0) {
 228                         rxq->state |= SFC_RXQ_FLUSH_FAILED;
 229                         break;
 230                 }
 231                 rxq->state &= ~SFC_RXQ_FLUSH_FAILED;
 232                 rxq->state |= SFC_RXQ_FLUSHING;
 233
 234                 /*
 235                  * Wait for Rx queue flush done or failed event at least
 236                  * SFC_RX_QFLUSH_POLL_WAIT_MS milliseconds and not more
 237                  * than 2 seconds (SFC_RX_QFLUSH_POLL_WAIT_MS multiplied
 238                  * by SFC_RX_QFLUSH_POLL_ATTEMPTS).
 239                  */
 240                 wait_count = 0;
 241                 do {
 242                         rte_delay_ms(SFC_RX_QFLUSH_POLL_WAIT_MS);
 243                         sfc_ev_qpoll(rxq->evq);
 244                 } while ((rxq->state & SFC_RXQ_FLUSHING) &&
 245                          (wait_count++ < SFC_RX_QFLUSH_POLL_ATTEMPTS));
 246
 247                 if (rxq->state & SFC_RXQ_FLUSHING)
 248                         sfc_err(sa, "RxQ %u flush timed out", sw_index);
 249
 250                 if (rxq->state & SFC_RXQ_FLUSH_FAILED)
 251                         sfc_err(sa, "RxQ %u flush failed", sw_index);
 252
 253                 if (rxq->state & SFC_RXQ_FLUSHED)
 254                         sfc_info(sa, "RxQ %u flushed", sw_index);
 255         }
 256
 257         sfc_rx_qpurge(rxq);
 258 }
 259
 260 int
 261 sfc_rx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
 262 {
 263         struct sfc_rxq_info *rxq_info;
 264         struct sfc_rxq *rxq;
 265         struct sfc_evq *evq;
 266         int rc;
 267
 268         sfc_log_init(sa, "sw_index=%u", sw_index);
 269
 270         SFC_ASSERT(sw_index < sa->rxq_count);
 271
 272         rxq_info = &sa->rxq_info[sw_index];
 273         rxq = rxq_info->rxq;
 274         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 275
 276         evq = rxq->evq;
 277
 278         rc = sfc_ev_qstart(sa, evq->evq_index);
 279         if (rc != 0)
 280                 goto fail_ev_qstart;
 281
 282         rc = efx_rx_qcreate(sa->nic, rxq->hw_index, 0, rxq_info->type,
 283                             &rxq->mem, rxq_info->entries,
 284                             0 /* not used on EF10 */, evq->common,
 285                             &rxq->common);
 286         if (rc != 0)
 287                 goto fail_rx_qcreate;
 288
 289         efx_rx_qenable(rxq->common);
 290
 291         rxq->pending = rxq->completed = rxq->added = rxq->pushed = 0;
 292
 293         rxq->state |= (SFC_RXQ_STARTED | SFC_RXQ_RUNNING);
 294
 295         sfc_rx_qrefill(rxq);
 296
 297         if (sw_index == 0) {
 298                 rc = efx_mac_filter_default_rxq_set(sa->nic, rxq->common,
 299                                                     B_FALSE);
 300                 if (rc != 0)
 301                         goto fail_mac_filter_default_rxq_set;
 302         }
 303
 304         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 305         sa->eth_dev->data->rx_queue_state[sw_index] =
 306                 RTE_ETH_QUEUE_STATE_STARTED;
 307
 308         return 0;
 309
 310 fail_mac_filter_default_rxq_set:
 311         sfc_rx_qflush(sa, sw_index);
 312
 313 fail_rx_qcreate:
 314         sfc_ev_qstop(sa, evq->evq_index);
 315
 316 fail_ev_qstart:
 317         return rc;
 318 }
 319
 320 void
 321 sfc_rx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
 322 {
 323         struct sfc_rxq_info *rxq_info;
 324         struct sfc_rxq *rxq;
 325
 326         sfc_log_init(sa, "sw_index=%u", sw_index);
 327
 328         SFC_ASSERT(sw_index < sa->rxq_count);
 329
 330         rxq_info = &sa->rxq_info[sw_index];
 331         rxq = rxq_info->rxq;
 332         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 333
 334         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 335         sa->eth_dev->data->rx_queue_state[sw_index] =
 336                 RTE_ETH_QUEUE_STATE_STOPPED;
 337
 338         rxq->state &= ~SFC_RXQ_RUNNING;
 339
 340         if (sw_index == 0)
 341                 efx_mac_filter_default_rxq_clear(sa->nic);
 342
 343         sfc_rx_qflush(sa, sw_index);
 344
 345         rxq->state = SFC_RXQ_INITIALIZED;
 346
 347         efx_rx_qdestroy(rxq->common);
 348
 349         sfc_ev_qstop(sa, rxq->evq->evq_index);
 350 }
 351
 352 static int
 353 sfc_rx_qcheck_conf(struct sfc_adapter *sa,
 354                    const struct rte_eth_rxconf *rx_conf)
 355 {
 356         int rc = 0;
 357
 358         if (rx_conf->rx_thresh.pthresh != 0 ||
 359             rx_conf->rx_thresh.hthresh != 0 ||
 360             rx_conf->rx_thresh.wthresh != 0) {
 361                 sfc_err(sa,
 362                         "RxQ prefetch/host/writeback thresholds are not supported");
 363                 rc = EINVAL;
 364         }
 365
 366         if (rx_conf->rx_free_thresh != 0) {
 367                 sfc_err(sa, "RxQ free threshold is not supported");
 368                 rc = EINVAL;
 369         }
 370
 371         if (rx_conf->rx_drop_en == 0) {
 372                 sfc_err(sa, "RxQ drop disable is not supported");
 373                 rc = EINVAL;
 374         }
 375
 376         if (rx_conf->rx_deferred_start != 0) {
 377                 sfc_err(sa, "RxQ deferred start is not supported");
 378                 rc = EINVAL;
 379         }
 380
 381         return rc;
 382 }
 383
 384 static unsigned int
 385 sfc_rx_mbuf_data_alignment(struct rte_mempool *mb_pool)
 386 {
 387         uint32_t data_off;
 388         uint32_t order;
 389
 390         /* The mbuf object itself is always cache line aligned */
 391         order = rte_bsf32(RTE_CACHE_LINE_SIZE);
 392
 393         /* Data offset from mbuf object start */
 394         data_off = sizeof(struct rte_mbuf) + rte_pktmbuf_priv_size(mb_pool) +
 395                 RTE_PKTMBUF_HEADROOM;
 396
 397         order = MIN(order, rte_bsf32(data_off));
 398
 399         return 1u << (order - 1);
 400 }
 401
 402 static uint16_t
 403 sfc_rx_mb_pool_buf_size(struct sfc_adapter *sa, struct rte_mempool *mb_pool)
 404 {
 405         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 406         const uint32_t nic_align_start = MAX(1, encp->enc_rx_buf_align_start);
 407         const uint32_t nic_align_end = MAX(1, encp->enc_rx_buf_align_end);
 408         uint16_t buf_size;
 409         unsigned int buf_aligned;
 410         unsigned int start_alignment;
 411         unsigned int end_padding_alignment;
 412
 413         /* Below it is assumed that both alignments are power of 2 */
 414         SFC_ASSERT(rte_is_power_of_2(nic_align_start));
 415         SFC_ASSERT(rte_is_power_of_2(nic_align_end));
 416
 417         /*
 418          * mbuf is always cache line aligned, double-check
 419          * that it meets rx buffer start alignment requirements.
 420          */
 421
 422         /* Start from mbuf pool data room size */
 423         buf_size = rte_pktmbuf_data_room_size(mb_pool);
 424
 425         /* Remove headroom */
 426         if (buf_size <= RTE_PKTMBUF_HEADROOM) {
 427                 sfc_err(sa,
 428                         "RxQ mbuf pool %s object data room size %u is smaller than headroom %u",
 429                         mb_pool->name, buf_size, RTE_PKTMBUF_HEADROOM);
 430                 return 0;
 431         }
 432         buf_size -= RTE_PKTMBUF_HEADROOM;
 433
 434         /* Calculate guaranteed data start alignment */
 435         buf_aligned = sfc_rx_mbuf_data_alignment(mb_pool);
 436
 437         /* Reserve space for start alignment */
 438         if (buf_aligned < nic_align_start) {
 439                 start_alignment = nic_align_start - buf_aligned;
 440                 if (buf_size <= start_alignment) {
 441                         sfc_err(sa,
 442                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u and buffer start alignment %u required by NIC",
 443                                 mb_pool->name,
 444                                 rte_pktmbuf_data_room_size(mb_pool),
 445                                 RTE_PKTMBUF_HEADROOM, start_alignment);
 446                         return 0;
 447                 }
 448                 buf_aligned = nic_align_start;
 449                 buf_size -= start_alignment;
 450         } else {
 451                 start_alignment = 0;
 452         }
 453
 454         /* Make sure that end padding does not write beyond the buffer */
 455         if (buf_aligned < nic_align_end) {
 456                 /*
 457                  * Estimate space which can be lost. If guarnteed buffer
 458                  * size is odd, lost space is (nic_align_end - 1). More
 459                  * accurate formula is below.
 460                  */
 461                 end_padding_alignment = nic_align_end -
 462                         MIN(buf_aligned, 1u << (rte_bsf32(buf_size) - 1));
 463                 if (buf_size <= end_padding_alignment) {
 464                         sfc_err(sa,
 465                                 "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",
 466                                 mb_pool->name,
 467                                 rte_pktmbuf_data_room_size(mb_pool),
 468                                 RTE_PKTMBUF_HEADROOM, start_alignment,
 469                                 end_padding_alignment);
 470                         return 0;
 471                 }
 472                 buf_size -= end_padding_alignment;
 473         } else {
 474                 /*
 475                  * Start is aligned the same or better than end,
 476                  * just align length.
 477                  */
 478                 buf_size = P2ALIGN(buf_size, nic_align_end);
 479         }
 480
 481         return buf_size;
 482 }
 483
 484 int
 485 sfc_rx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
 486              uint16_t nb_rx_desc, unsigned int socket_id,
 487              const struct rte_eth_rxconf *rx_conf,
 488              struct rte_mempool *mb_pool)
 489 {
 490         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 491         int rc;
 492         uint16_t buf_size;
 493         struct sfc_rxq_info *rxq_info;
 494         unsigned int evq_index;
 495         struct sfc_evq *evq;
 496         struct sfc_rxq *rxq;
 497
 498         rc = sfc_rx_qcheck_conf(sa, rx_conf);
 499         if (rc != 0)
 500                 goto fail_bad_conf;
 501
 502         buf_size = sfc_rx_mb_pool_buf_size(sa, mb_pool);
 503         if (buf_size == 0) {
 504                 sfc_err(sa, "RxQ %u mbuf pool object size is too small",
 505                         sw_index);
 506                 rc = EINVAL;
 507                 goto fail_bad_conf;
 508         }
 509
 510         if ((buf_size < sa->port.pdu + encp->enc_rx_prefix_size) &&
 511             !sa->eth_dev->data->dev_conf.rxmode.enable_scatter) {
 512                 sfc_err(sa, "Rx scatter is disabled and RxQ %u mbuf pool "
 513                         "object size is too small", sw_index);
 514                 sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
 515                         "PDU size %u plus Rx prefix %u bytes",
 516                         sw_index, buf_size, (unsigned int)sa->port.pdu,
 517                         encp->enc_rx_prefix_size);
 518                 rc = EINVAL;
 519                 goto fail_bad_conf;
 520         }
 521
 522         SFC_ASSERT(sw_index < sa->rxq_count);
 523         rxq_info = &sa->rxq_info[sw_index];
 524
 525         SFC_ASSERT(nb_rx_desc <= rxq_info->max_entries);
 526         rxq_info->entries = nb_rx_desc;
 527         rxq_info->type = EFX_RXQ_TYPE_DEFAULT;
 528
 529         evq_index = sfc_evq_index_by_rxq_sw_index(sa, sw_index);
 530
 531         rc = sfc_ev_qinit(sa, evq_index, rxq_info->entries, socket_id);
 532         if (rc != 0)
 533                 goto fail_ev_qinit;
 534
 535         evq = sa->evq_info[evq_index].evq;
 536
 537         rc = ENOMEM;
 538         rxq = rte_zmalloc_socket("sfc-rxq", sizeof(*rxq), RTE_CACHE_LINE_SIZE,
 539                                  socket_id);
 540         if (rxq == NULL)
 541                 goto fail_rxq_alloc;
 542
 543         rc = sfc_dma_alloc(sa, "rxq", sw_index, EFX_RXQ_SIZE(rxq_info->entries),
 544                            socket_id, &rxq->mem);
 545         if (rc != 0)
 546                 goto fail_dma_alloc;
 547
 548         rc = ENOMEM;
 549         rxq->sw_desc = rte_calloc_socket("sfc-rxq-sw_desc", rxq_info->entries,
 550                                          sizeof(*rxq->sw_desc),
 551                                          RTE_CACHE_LINE_SIZE, socket_id);
 552         if (rxq->sw_desc == NULL)
 553                 goto fail_desc_alloc;
 554
 555         evq->rxq = rxq;
 556         rxq->evq = evq;
 557         rxq->ptr_mask = rxq_info->entries - 1;
 558         rxq->refill_mb_pool = mb_pool;
 559         rxq->buf_size = buf_size;
 560         rxq->hw_index = sw_index;
 561         rxq->port_id = sa->eth_dev->data->port_id;
 562
 563         /* Cache limits required on datapath in RxQ structure */
 564         rxq->batch_max = encp->enc_rx_batch_max;
 565         rxq->prefix_size = encp->enc_rx_prefix_size;
 566
 567         rxq->state = SFC_RXQ_INITIALIZED;
 568
 569         rxq_info->rxq = rxq;
 570
 571         return 0;
 572
 573 fail_desc_alloc:
 574         sfc_dma_free(sa, &rxq->mem);
 575
 576 fail_dma_alloc:
 577         rte_free(rxq);
 578
 579 fail_rxq_alloc:
 580         sfc_ev_qfini(sa, evq_index);
 581
 582 fail_ev_qinit:
 583         rxq_info->entries = 0;
 584
 585 fail_bad_conf:
 586         sfc_log_init(sa, "failed %d", rc);
 587         return rc;
 588 }
 589
 590 void
 591 sfc_rx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
 592 {
 593         struct sfc_rxq_info *rxq_info;
 594         struct sfc_rxq *rxq;
 595
 596         SFC_ASSERT(sw_index < sa->rxq_count);
 597
 598         rxq_info = &sa->rxq_info[sw_index];
 599
 600         rxq = rxq_info->rxq;
 601         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 602
 603         rxq_info->rxq = NULL;
 604         rxq_info->entries = 0;
 605
 606         rte_free(rxq->sw_desc);
 607         sfc_dma_free(sa, &rxq->mem);
 608         rte_free(rxq);
 609 }
 610
 611 int
 612 sfc_rx_start(struct sfc_adapter *sa)
 613 {
 614         unsigned int sw_index;
 615         int rc;
 616
 617         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 618
 619         rc = efx_rx_init(sa->nic);
 620         if (rc != 0)
 621                 goto fail_rx_init;
 622
 623         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
 624                 rc = sfc_rx_qstart(sa, sw_index);
 625                 if (rc != 0)
 626                         goto fail_rx_qstart;
 627         }
 628
 629         return 0;
 630
 631 fail_rx_qstart:
 632         while (sw_index-- > 0)
 633                 sfc_rx_qstop(sa, sw_index);
 634
 635         efx_rx_fini(sa->nic);
 636
 637 fail_rx_init:
 638         sfc_log_init(sa, "failed %d", rc);
 639         return rc;
 640 }
 641
 642 void
 643 sfc_rx_stop(struct sfc_adapter *sa)
 644 {
 645         unsigned int sw_index;
 646
 647         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 648
 649         sw_index = sa->rxq_count;
 650         while (sw_index-- > 0) {
 651                 if (sa->rxq_info[sw_index].rxq != NULL)
 652                         sfc_rx_qstop(sa, sw_index);
 653         }
 654
 655         efx_rx_fini(sa->nic);
 656 }
 657
 658 static int
 659 sfc_rx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
 660 {
 661         struct sfc_rxq_info *rxq_info = &sa->rxq_info[sw_index];
 662         unsigned int max_entries;
 663
 664         max_entries = EFX_RXQ_MAXNDESCS;
 665         SFC_ASSERT(rte_is_power_of_2(max_entries));
 666
 667         rxq_info->max_entries = max_entries;
 668
 669         return 0;
 670 }
 671
 672 static int
 673 sfc_rx_check_mode(struct sfc_adapter *sa, struct rte_eth_rxmode *rxmode)
 674 {
 675         int rc = 0;
 676
 677         switch (rxmode->mq_mode) {
 678         case ETH_MQ_RX_NONE:
 679                 /* No special checks are required */
 680                 break;
 681         default:
 682                 sfc_err(sa, "Rx multi-queue mode %u not supported",
 683                         rxmode->mq_mode);
 684                 rc = EINVAL;
 685         }
 686
 687         if (rxmode->header_split) {
 688                 sfc_err(sa, "Header split on Rx not supported");
 689                 rc = EINVAL;
 690         }
 691
 692         if (rxmode->hw_vlan_filter) {
 693                 sfc_err(sa, "HW VLAN filtering not supported");
 694                 rc = EINVAL;
 695         }
 696
 697         if (rxmode->hw_vlan_strip) {
 698                 sfc_err(sa, "HW VLAN stripping not supported");
 699                 rc = EINVAL;
 700         }
 701
 702         if (rxmode->hw_vlan_extend) {
 703                 sfc_err(sa,
 704                         "Q-in-Q HW VLAN stripping not supported");
 705                 rc = EINVAL;
 706         }
 707
 708         if (!rxmode->hw_strip_crc) {
 709                 sfc_warn(sa,
 710                          "FCS stripping control not supported - always stripped");
 711                 rxmode->hw_strip_crc = 1;
 712         }
 713
 714         if (rxmode->enable_scatter) {
 715                 sfc_err(sa, "Scatter on Rx not supported");
 716                 rc = EINVAL;
 717         }
 718
 719         if (rxmode->enable_lro) {
 720                 sfc_err(sa, "LRO not supported");
 721                 rc = EINVAL;
 722         }
 723
 724         return rc;
 725 }
 726
 727 /**
 728  * Initialize Rx subsystem.
 729  *
 730  * Called at device configuration stage when number of receive queues is
 731  * specified together with other device level receive configuration.
 732  *
 733  * It should be used to allocate NUMA-unaware resources.
 734  */
 735 int
 736 sfc_rx_init(struct sfc_adapter *sa)
 737 {
 738         struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
 739         unsigned int sw_index;
 740         int rc;
 741
 742         rc = sfc_rx_check_mode(sa, &dev_conf->rxmode);
 743         if (rc != 0)
 744                 goto fail_check_mode;
 745
 746         sa->rxq_count = sa->eth_dev->data->nb_rx_queues;
 747
 748         rc = ENOMEM;
 749         sa->rxq_info = rte_calloc_socket("sfc-rxqs", sa->rxq_count,
 750                                          sizeof(struct sfc_rxq_info), 0,
 751                                          sa->socket_id);
 752         if (sa->rxq_info == NULL)
 753                 goto fail_rxqs_alloc;
 754
 755         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
 756                 rc = sfc_rx_qinit_info(sa, sw_index);
 757                 if (rc != 0)
 758                         goto fail_rx_qinit_info;
 759         }
 760
 761         return 0;
 762
 763 fail_rx_qinit_info:
 764         rte_free(sa->rxq_info);
 765         sa->rxq_info = NULL;
 766
 767 fail_rxqs_alloc:
 768         sa->rxq_count = 0;
 769 fail_check_mode:
 770         sfc_log_init(sa, "failed %d", rc);
 771         return rc;
 772 }
 773
 774 /**
 775  * Shutdown Rx subsystem.
 776  *
 777  * Called at device close stage, for example, before device
 778  * reconfiguration or shutdown.
 779  */
 780 void
 781 sfc_rx_fini(struct sfc_adapter *sa)
 782 {
 783         unsigned int sw_index;
 784
 785         sw_index = sa->rxq_count;
 786         while (sw_index-- > 0) {
 787                 if (sa->rxq_info[sw_index].rxq != NULL)
 788                         sfc_rx_qfini(sa, sw_index);
 789         }
 790
 791         rte_free(sa->rxq_info);
 792         sa->rxq_info = NULL;
 793         sa->rxq_count = 0;
 794 }