drivers/net/sfc/sfc_rx.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  * Copyright (c) 2016-2017 Solarflare Communications Inc.
   5  * All rights reserved.
   6  *
   7  * This software was jointly developed between OKTET Labs (under contract
   8  * for Solarflare) and Solarflare Communications, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright notice,
  14  *    this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright notice,
  16  *    this list of conditions and the following disclaimer in the documentation
  17  *    and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  29  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <rte_mempool.h>
  33
  34 #include "efx.h"
  35
  36 #include "sfc.h"
  37 #include "sfc_debug.h"
  38 #include "sfc_log.h"
  39 #include "sfc_ev.h"
  40 #include "sfc_rx.h"
  41 #include "sfc_kvargs.h"
  42 #include "sfc_tweak.h"
  43
  44 /*
  45  * Maximum number of Rx queue flush attempt in the case of failure or
  46  * flush timeout
  47  */
  48 #define SFC_RX_QFLUSH_ATTEMPTS          (3)
  49
  50 /*
  51  * Time to wait between event queue polling attempts when waiting for Rx
  52  * queue flush done or failed events.
  53  */
  54 #define SFC_RX_QFLUSH_POLL_WAIT_MS      (1)
  55
  56 /*
  57  * Maximum number of event queue polling attempts when waiting for Rx queue
  58  * flush done or failed events. It defines Rx queue flush attempt timeout
  59  * together with SFC_RX_QFLUSH_POLL_WAIT_MS.
  60  */
  61 #define SFC_RX_QFLUSH_POLL_ATTEMPTS     (2000)
  62
  63 void
  64 sfc_rx_qflush_done(struct sfc_rxq *rxq)
  65 {
  66         rxq->state |= SFC_RXQ_FLUSHED;
  67         rxq->state &= ~SFC_RXQ_FLUSHING;
  68 }
  69
  70 void
  71 sfc_rx_qflush_failed(struct sfc_rxq *rxq)
  72 {
  73         rxq->state |= SFC_RXQ_FLUSH_FAILED;
  74         rxq->state &= ~SFC_RXQ_FLUSHING;
  75 }
  76
  77 static void
  78 sfc_efx_rx_qrefill(struct sfc_efx_rxq *rxq)
  79 {
  80         unsigned int free_space;
  81         unsigned int bulks;
  82         void *objs[SFC_RX_REFILL_BULK];
  83         efsys_dma_addr_t addr[RTE_DIM(objs)];
  84         unsigned int added = rxq->added;
  85         unsigned int id;
  86         unsigned int i;
  87         struct sfc_efx_rx_sw_desc *rxd;
  88         struct rte_mbuf *m;
  89         uint16_t port_id = rxq->dp.dpq.port_id;
  90
  91         free_space = rxq->max_fill_level - (added - rxq->completed);
  92
  93         if (free_space < rxq->refill_threshold)
  94                 return;
  95
  96         bulks = free_space / RTE_DIM(objs);
  97         /* refill_threshold guarantees that bulks is positive */
  98         SFC_ASSERT(bulks > 0);
  99
 100         id = added & rxq->ptr_mask;
 101         do {
 102                 if (unlikely(rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
 103                                                   RTE_DIM(objs)) < 0)) {
 104                         /*
 105                          * It is hardly a safe way to increment counter
 106                          * from different contexts, but all PMDs do it.
 107                          */
 108                         rxq->evq->sa->eth_dev->data->rx_mbuf_alloc_failed +=
 109                                 RTE_DIM(objs);
 110                         /* Return if we have posted nothing yet */
 111                         if (added == rxq->added)
 112                                 return;
 113                         /* Push posted */
 114                         break;
 115                 }
 116
 117                 for (i = 0; i < RTE_DIM(objs);
 118                      ++i, id = (id + 1) & rxq->ptr_mask) {
 119                         m = objs[i];
 120
 121                         rxd = &rxq->sw_desc[id];
 122                         rxd->mbuf = m;
 123
 124                         SFC_ASSERT(rte_mbuf_refcnt_read(m) == 1);
 125                         m->data_off = RTE_PKTMBUF_HEADROOM;
 126                         SFC_ASSERT(m->next == NULL);
 127                         SFC_ASSERT(m->nb_segs == 1);
 128                         m->port = port_id;
 129
 130                         addr[i] = rte_pktmbuf_iova(m);
 131                 }
 132
 133                 efx_rx_qpost(rxq->common, addr, rxq->buf_size,
 134                              RTE_DIM(objs), rxq->completed, added);
 135                 added += RTE_DIM(objs);
 136         } while (--bulks > 0);
 137
 138         SFC_ASSERT(added != rxq->added);
 139         rxq->added = added;
 140         efx_rx_qpush(rxq->common, added, &rxq->pushed);
 141 }
 142
 143 static uint64_t
 144 sfc_efx_rx_desc_flags_to_offload_flags(const unsigned int desc_flags)
 145 {
 146         uint64_t mbuf_flags = 0;
 147
 148         switch (desc_flags & (EFX_PKT_IPV4 | EFX_CKSUM_IPV4)) {
 149         case (EFX_PKT_IPV4 | EFX_CKSUM_IPV4):
 150                 mbuf_flags |= PKT_RX_IP_CKSUM_GOOD;
 151                 break;
 152         case EFX_PKT_IPV4:
 153                 mbuf_flags |= PKT_RX_IP_CKSUM_BAD;
 154                 break;
 155         default:
 156                 RTE_BUILD_BUG_ON(PKT_RX_IP_CKSUM_UNKNOWN != 0);
 157                 SFC_ASSERT((mbuf_flags & PKT_RX_IP_CKSUM_MASK) ==
 158                            PKT_RX_IP_CKSUM_UNKNOWN);
 159                 break;
 160         }
 161
 162         switch ((desc_flags &
 163                  (EFX_PKT_TCP | EFX_PKT_UDP | EFX_CKSUM_TCPUDP))) {
 164         case (EFX_PKT_TCP | EFX_CKSUM_TCPUDP):
 165         case (EFX_PKT_UDP | EFX_CKSUM_TCPUDP):
 166                 mbuf_flags |= PKT_RX_L4_CKSUM_GOOD;
 167                 break;
 168         case EFX_PKT_TCP:
 169         case EFX_PKT_UDP:
 170                 mbuf_flags |= PKT_RX_L4_CKSUM_BAD;
 171                 break;
 172         default:
 173                 RTE_BUILD_BUG_ON(PKT_RX_L4_CKSUM_UNKNOWN != 0);
 174                 SFC_ASSERT((mbuf_flags & PKT_RX_L4_CKSUM_MASK) ==
 175                            PKT_RX_L4_CKSUM_UNKNOWN);
 176                 break;
 177         }
 178
 179         return mbuf_flags;
 180 }
 181
 182 static uint32_t
 183 sfc_efx_rx_desc_flags_to_packet_type(const unsigned int desc_flags)
 184 {
 185         return RTE_PTYPE_L2_ETHER |
 186                 ((desc_flags & EFX_PKT_IPV4) ?
 187                         RTE_PTYPE_L3_IPV4_EXT_UNKNOWN : 0) |
 188                 ((desc_flags & EFX_PKT_IPV6) ?
 189                         RTE_PTYPE_L3_IPV6_EXT_UNKNOWN : 0) |
 190                 ((desc_flags & EFX_PKT_TCP) ? RTE_PTYPE_L4_TCP : 0) |
 191                 ((desc_flags & EFX_PKT_UDP) ? RTE_PTYPE_L4_UDP : 0);
 192 }
 193
 194 static const uint32_t *
 195 sfc_efx_supported_ptypes_get(__rte_unused uint32_t tunnel_encaps)
 196 {
 197         static const uint32_t ptypes[] = {
 198                 RTE_PTYPE_L2_ETHER,
 199                 RTE_PTYPE_L3_IPV4_EXT_UNKNOWN,
 200                 RTE_PTYPE_L3_IPV6_EXT_UNKNOWN,
 201                 RTE_PTYPE_L4_TCP,
 202                 RTE_PTYPE_L4_UDP,
 203                 RTE_PTYPE_UNKNOWN
 204         };
 205
 206         return ptypes;
 207 }
 208
 209 #if EFSYS_OPT_RX_SCALE
 210 static void
 211 sfc_efx_rx_set_rss_hash(struct sfc_efx_rxq *rxq, unsigned int flags,
 212                         struct rte_mbuf *m)
 213 {
 214         uint8_t *mbuf_data;
 215
 216
 217         if ((rxq->flags & SFC_EFX_RXQ_FLAG_RSS_HASH) == 0)
 218                 return;
 219
 220         mbuf_data = rte_pktmbuf_mtod(m, uint8_t *);
 221
 222         if (flags & (EFX_PKT_IPV4 | EFX_PKT_IPV6)) {
 223                 m->hash.rss = efx_pseudo_hdr_hash_get(rxq->common,
 224                                                       EFX_RX_HASHALG_TOEPLITZ,
 225                                                       mbuf_data);
 226
 227                 m->ol_flags |= PKT_RX_RSS_HASH;
 228         }
 229 }
 230 #else
 231 static void
 232 sfc_efx_rx_set_rss_hash(__rte_unused struct sfc_efx_rxq *rxq,
 233                         __rte_unused unsigned int flags,
 234                         __rte_unused struct rte_mbuf *m)
 235 {
 236 }
 237 #endif
 238
 239 static uint16_t
 240 sfc_efx_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 241 {
 242         struct sfc_dp_rxq *dp_rxq = rx_queue;
 243         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 244         unsigned int completed;
 245         unsigned int prefix_size = rxq->prefix_size;
 246         unsigned int done_pkts = 0;
 247         boolean_t discard_next = B_FALSE;
 248         struct rte_mbuf *scatter_pkt = NULL;
 249
 250         if (unlikely((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) == 0))
 251                 return 0;
 252
 253         sfc_ev_qpoll(rxq->evq);
 254
 255         completed = rxq->completed;
 256         while (completed != rxq->pending && done_pkts < nb_pkts) {
 257                 unsigned int id;
 258                 struct sfc_efx_rx_sw_desc *rxd;
 259                 struct rte_mbuf *m;
 260                 unsigned int seg_len;
 261                 unsigned int desc_flags;
 262
 263                 id = completed++ & rxq->ptr_mask;
 264                 rxd = &rxq->sw_desc[id];
 265                 m = rxd->mbuf;
 266                 desc_flags = rxd->flags;
 267
 268                 if (discard_next)
 269                         goto discard;
 270
 271                 if (desc_flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))
 272                         goto discard;
 273
 274                 if (desc_flags & EFX_PKT_PREFIX_LEN) {
 275                         uint16_t tmp_size;
 276                         int rc __rte_unused;
 277
 278                         rc = efx_pseudo_hdr_pkt_length_get(rxq->common,
 279                                 rte_pktmbuf_mtod(m, uint8_t *), &tmp_size);
 280                         SFC_ASSERT(rc == 0);
 281                         seg_len = tmp_size;
 282                 } else {
 283                         seg_len = rxd->size - prefix_size;
 284                 }
 285
 286                 rte_pktmbuf_data_len(m) = seg_len;
 287                 rte_pktmbuf_pkt_len(m) = seg_len;
 288
 289                 if (scatter_pkt != NULL) {
 290                         if (rte_pktmbuf_chain(scatter_pkt, m) != 0) {
 291                                 rte_pktmbuf_free(scatter_pkt);
 292                                 goto discard;
 293                         }
 294                         /* The packet to deliver */
 295                         m = scatter_pkt;
 296                 }
 297
 298                 if (desc_flags & EFX_PKT_CONT) {
 299                         /* The packet is scattered, more fragments to come */
 300                         scatter_pkt = m;
 301                         /* Further fragments have no prefix */
 302                         prefix_size = 0;
 303                         continue;
 304                 }
 305
 306                 /* Scattered packet is done */
 307                 scatter_pkt = NULL;
 308                 /* The first fragment of the packet has prefix */
 309                 prefix_size = rxq->prefix_size;
 310
 311                 m->ol_flags =
 312                         sfc_efx_rx_desc_flags_to_offload_flags(desc_flags);
 313                 m->packet_type =
 314                         sfc_efx_rx_desc_flags_to_packet_type(desc_flags);
 315
 316                 /*
 317                  * Extract RSS hash from the packet prefix and
 318                  * set the corresponding field (if needed and possible)
 319                  */
 320                 sfc_efx_rx_set_rss_hash(rxq, desc_flags, m);
 321
 322                 m->data_off += prefix_size;
 323
 324                 *rx_pkts++ = m;
 325                 done_pkts++;
 326                 continue;
 327
 328 discard:
 329                 discard_next = ((desc_flags & EFX_PKT_CONT) != 0);
 330                 rte_mempool_put(rxq->refill_mb_pool, m);
 331                 rxd->mbuf = NULL;
 332         }
 333
 334         /* pending is only moved when entire packet is received */
 335         SFC_ASSERT(scatter_pkt == NULL);
 336
 337         rxq->completed = completed;
 338
 339         sfc_efx_rx_qrefill(rxq);
 340
 341         return done_pkts;
 342 }
 343
 344 static sfc_dp_rx_qdesc_npending_t sfc_efx_rx_qdesc_npending;
 345 static unsigned int
 346 sfc_efx_rx_qdesc_npending(struct sfc_dp_rxq *dp_rxq)
 347 {
 348         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 349
 350         if ((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) == 0)
 351                 return 0;
 352
 353         sfc_ev_qpoll(rxq->evq);
 354
 355         return rxq->pending - rxq->completed;
 356 }
 357
 358 static sfc_dp_rx_qdesc_status_t sfc_efx_rx_qdesc_status;
 359 static int
 360 sfc_efx_rx_qdesc_status(struct sfc_dp_rxq *dp_rxq, uint16_t offset)
 361 {
 362         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 363
 364         if (unlikely(offset > rxq->ptr_mask))
 365                 return -EINVAL;
 366
 367         /*
 368          * Poll EvQ to derive up-to-date 'rxq->pending' figure;
 369          * it is required for the queue to be running, but the
 370          * check is omitted because API design assumes that it
 371          * is the duty of the caller to satisfy all conditions
 372          */
 373         SFC_ASSERT((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) ==
 374                    SFC_EFX_RXQ_FLAG_RUNNING);
 375         sfc_ev_qpoll(rxq->evq);
 376
 377         /*
 378          * There is a handful of reserved entries in the ring,
 379          * but an explicit check whether the offset points to
 380          * a reserved entry is neglected since the two checks
 381          * below rely on the figures which take the HW limits
 382          * into account and thus if an entry is reserved, the
 383          * checks will fail and UNAVAIL code will be returned
 384          */
 385
 386         if (offset < (rxq->pending - rxq->completed))
 387                 return RTE_ETH_RX_DESC_DONE;
 388
 389         if (offset < (rxq->added - rxq->completed))
 390                 return RTE_ETH_RX_DESC_AVAIL;
 391
 392         return RTE_ETH_RX_DESC_UNAVAIL;
 393 }
 394
 395 struct sfc_rxq *
 396 sfc_rxq_by_dp_rxq(const struct sfc_dp_rxq *dp_rxq)
 397 {
 398         const struct sfc_dp_queue *dpq = &dp_rxq->dpq;
 399         struct rte_eth_dev *eth_dev;
 400         struct sfc_adapter *sa;
 401         struct sfc_rxq *rxq;
 402
 403         SFC_ASSERT(rte_eth_dev_is_valid_port(dpq->port_id));
 404         eth_dev = &rte_eth_devices[dpq->port_id];
 405
 406         sa = eth_dev->data->dev_private;
 407
 408         SFC_ASSERT(dpq->queue_id < sa->rxq_count);
 409         rxq = sa->rxq_info[dpq->queue_id].rxq;
 410
 411         SFC_ASSERT(rxq != NULL);
 412         return rxq;
 413 }
 414
 415 static sfc_dp_rx_qsize_up_rings_t sfc_efx_rx_qsize_up_rings;
 416 static int
 417 sfc_efx_rx_qsize_up_rings(uint16_t nb_rx_desc,
 418                           unsigned int *rxq_entries,
 419                           unsigned int *evq_entries,
 420                           unsigned int *rxq_max_fill_level)
 421 {
 422         *rxq_entries = nb_rx_desc;
 423         *evq_entries = nb_rx_desc;
 424         *rxq_max_fill_level = EFX_RXQ_LIMIT(*rxq_entries);
 425         return 0;
 426 }
 427
 428 static sfc_dp_rx_qcreate_t sfc_efx_rx_qcreate;
 429 static int
 430 sfc_efx_rx_qcreate(uint16_t port_id, uint16_t queue_id,
 431                    const struct rte_pci_addr *pci_addr, int socket_id,
 432                    const struct sfc_dp_rx_qcreate_info *info,
 433                    struct sfc_dp_rxq **dp_rxqp)
 434 {
 435         struct sfc_efx_rxq *rxq;
 436         int rc;
 437
 438         rc = ENOMEM;
 439         rxq = rte_zmalloc_socket("sfc-efx-rxq", sizeof(*rxq),
 440                                  RTE_CACHE_LINE_SIZE, socket_id);
 441         if (rxq == NULL)
 442                 goto fail_rxq_alloc;
 443
 444         sfc_dp_queue_init(&rxq->dp.dpq, port_id, queue_id, pci_addr);
 445
 446         rc = ENOMEM;
 447         rxq->sw_desc = rte_calloc_socket("sfc-efx-rxq-sw_desc",
 448                                          info->rxq_entries,
 449                                          sizeof(*rxq->sw_desc),
 450                                          RTE_CACHE_LINE_SIZE, socket_id);
 451         if (rxq->sw_desc == NULL)
 452                 goto fail_desc_alloc;
 453
 454         /* efx datapath is bound to efx control path */
 455         rxq->evq = sfc_rxq_by_dp_rxq(&rxq->dp)->evq;
 456         if (info->flags & SFC_RXQ_FLAG_RSS_HASH)
 457                 rxq->flags |= SFC_EFX_RXQ_FLAG_RSS_HASH;
 458         rxq->ptr_mask = info->rxq_entries - 1;
 459         rxq->batch_max = info->batch_max;
 460         rxq->prefix_size = info->prefix_size;
 461         rxq->max_fill_level = info->max_fill_level;
 462         rxq->refill_threshold = info->refill_threshold;
 463         rxq->buf_size = info->buf_size;
 464         rxq->refill_mb_pool = info->refill_mb_pool;
 465
 466         *dp_rxqp = &rxq->dp;
 467         return 0;
 468
 469 fail_desc_alloc:
 470         rte_free(rxq);
 471
 472 fail_rxq_alloc:
 473         return rc;
 474 }
 475
 476 static sfc_dp_rx_qdestroy_t sfc_efx_rx_qdestroy;
 477 static void
 478 sfc_efx_rx_qdestroy(struct sfc_dp_rxq *dp_rxq)
 479 {
 480         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 481
 482         rte_free(rxq->sw_desc);
 483         rte_free(rxq);
 484 }
 485
 486 static sfc_dp_rx_qstart_t sfc_efx_rx_qstart;
 487 static int
 488 sfc_efx_rx_qstart(struct sfc_dp_rxq *dp_rxq,
 489                   __rte_unused unsigned int evq_read_ptr)
 490 {
 491         /* libefx-based datapath is specific to libefx-based PMD */
 492         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 493         struct sfc_rxq *crxq = sfc_rxq_by_dp_rxq(dp_rxq);
 494
 495         rxq->common = crxq->common;
 496
 497         rxq->pending = rxq->completed = rxq->added = rxq->pushed = 0;
 498
 499         sfc_efx_rx_qrefill(rxq);
 500
 501         rxq->flags |= (SFC_EFX_RXQ_FLAG_STARTED | SFC_EFX_RXQ_FLAG_RUNNING);
 502
 503         return 0;
 504 }
 505
 506 static sfc_dp_rx_qstop_t sfc_efx_rx_qstop;
 507 static void
 508 sfc_efx_rx_qstop(struct sfc_dp_rxq *dp_rxq,
 509                  __rte_unused unsigned int *evq_read_ptr)
 510 {
 511         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 512
 513         rxq->flags &= ~SFC_EFX_RXQ_FLAG_RUNNING;
 514
 515         /* libefx-based datapath is bound to libefx-based PMD and uses
 516          * event queue structure directly. So, there is no necessity to
 517          * return EvQ read pointer.
 518          */
 519 }
 520
 521 static sfc_dp_rx_qpurge_t sfc_efx_rx_qpurge;
 522 static void
 523 sfc_efx_rx_qpurge(struct sfc_dp_rxq *dp_rxq)
 524 {
 525         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 526         unsigned int i;
 527         struct sfc_efx_rx_sw_desc *rxd;
 528
 529         for (i = rxq->completed; i != rxq->added; ++i) {
 530                 rxd = &rxq->sw_desc[i & rxq->ptr_mask];
 531                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
 532                 rxd->mbuf = NULL;
 533                 /* Packed stream relies on 0 in inactive SW desc.
 534                  * Rx queue stop is not performance critical, so
 535                  * there is no harm to do it always.
 536                  */
 537                 rxd->flags = 0;
 538                 rxd->size = 0;
 539         }
 540
 541         rxq->flags &= ~SFC_EFX_RXQ_FLAG_STARTED;
 542 }
 543
 544 struct sfc_dp_rx sfc_efx_rx = {
 545         .dp = {
 546                 .name           = SFC_KVARG_DATAPATH_EFX,
 547                 .type           = SFC_DP_RX,
 548                 .hw_fw_caps     = 0,
 549         },
 550         .features               = SFC_DP_RX_FEAT_SCATTER,
 551         .qsize_up_rings         = sfc_efx_rx_qsize_up_rings,
 552         .qcreate                = sfc_efx_rx_qcreate,
 553         .qdestroy               = sfc_efx_rx_qdestroy,
 554         .qstart                 = sfc_efx_rx_qstart,
 555         .qstop                  = sfc_efx_rx_qstop,
 556         .qpurge                 = sfc_efx_rx_qpurge,
 557         .supported_ptypes_get   = sfc_efx_supported_ptypes_get,
 558         .qdesc_npending         = sfc_efx_rx_qdesc_npending,
 559         .qdesc_status           = sfc_efx_rx_qdesc_status,
 560         .pkt_burst              = sfc_efx_recv_pkts,
 561 };
 562
 563 unsigned int
 564 sfc_rx_qdesc_npending(struct sfc_adapter *sa, unsigned int sw_index)
 565 {
 566         struct sfc_rxq *rxq;
 567
 568         SFC_ASSERT(sw_index < sa->rxq_count);
 569         rxq = sa->rxq_info[sw_index].rxq;
 570
 571         if (rxq == NULL || (rxq->state & SFC_RXQ_STARTED) == 0)
 572                 return 0;
 573
 574         return sa->dp_rx->qdesc_npending(rxq->dp);
 575 }
 576
 577 int
 578 sfc_rx_qdesc_done(struct sfc_dp_rxq *dp_rxq, unsigned int offset)
 579 {
 580         struct sfc_rxq *rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 581
 582         return offset < rxq->evq->sa->dp_rx->qdesc_npending(dp_rxq);
 583 }
 584
 585 static void
 586 sfc_rx_qflush(struct sfc_adapter *sa, unsigned int sw_index)
 587 {
 588         struct sfc_rxq *rxq;
 589         unsigned int retry_count;
 590         unsigned int wait_count;
 591         int rc;
 592
 593         rxq = sa->rxq_info[sw_index].rxq;
 594         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 595
 596         /*
 597          * Retry Rx queue flushing in the case of flush failed or
 598          * timeout. In the worst case it can delay for 6 seconds.
 599          */
 600         for (retry_count = 0;
 601              ((rxq->state & SFC_RXQ_FLUSHED) == 0) &&
 602              (retry_count < SFC_RX_QFLUSH_ATTEMPTS);
 603              ++retry_count) {
 604                 rc = efx_rx_qflush(rxq->common);
 605                 if (rc != 0) {
 606                         rxq->state |= (rc == EALREADY) ?
 607                                 SFC_RXQ_FLUSHED : SFC_RXQ_FLUSH_FAILED;
 608                         break;
 609                 }
 610                 rxq->state &= ~SFC_RXQ_FLUSH_FAILED;
 611                 rxq->state |= SFC_RXQ_FLUSHING;
 612
 613                 /*
 614                  * Wait for Rx queue flush done or failed event at least
 615                  * SFC_RX_QFLUSH_POLL_WAIT_MS milliseconds and not more
 616                  * than 2 seconds (SFC_RX_QFLUSH_POLL_WAIT_MS multiplied
 617                  * by SFC_RX_QFLUSH_POLL_ATTEMPTS).
 618                  */
 619                 wait_count = 0;
 620                 do {
 621                         rte_delay_ms(SFC_RX_QFLUSH_POLL_WAIT_MS);
 622                         sfc_ev_qpoll(rxq->evq);
 623                 } while ((rxq->state & SFC_RXQ_FLUSHING) &&
 624                          (wait_count++ < SFC_RX_QFLUSH_POLL_ATTEMPTS));
 625
 626                 if (rxq->state & SFC_RXQ_FLUSHING)
 627                         sfc_err(sa, "RxQ %u flush timed out", sw_index);
 628
 629                 if (rxq->state & SFC_RXQ_FLUSH_FAILED)
 630                         sfc_err(sa, "RxQ %u flush failed", sw_index);
 631
 632                 if (rxq->state & SFC_RXQ_FLUSHED)
 633                         sfc_info(sa, "RxQ %u flushed", sw_index);
 634         }
 635
 636         sa->dp_rx->qpurge(rxq->dp);
 637 }
 638
 639 static int
 640 sfc_rx_default_rxq_set_filter(struct sfc_adapter *sa, struct sfc_rxq *rxq)
 641 {
 642         boolean_t rss = (sa->rss_channels > 0) ? B_TRUE : B_FALSE;
 643         struct sfc_port *port = &sa->port;
 644         int rc;
 645
 646         /*
 647          * If promiscuous or all-multicast mode has been requested, setting
 648          * filter for the default Rx queue might fail, in particular, while
 649          * running over PCI function which is not a member of corresponding
 650          * privilege groups; if this occurs, few iterations will be made to
 651          * repeat this step without promiscuous and all-multicast flags set
 652          */
 653 retry:
 654         rc = efx_mac_filter_default_rxq_set(sa->nic, rxq->common, rss);
 655         if (rc == 0)
 656                 return 0;
 657         else if (rc != EOPNOTSUPP)
 658                 return rc;
 659
 660         if (port->promisc) {
 661                 sfc_warn(sa, "promiscuous mode has been requested, "
 662                              "but the HW rejects it");
 663                 sfc_warn(sa, "promiscuous mode will be disabled");
 664
 665                 port->promisc = B_FALSE;
 666                 rc = sfc_set_rx_mode(sa);
 667                 if (rc != 0)
 668                         return rc;
 669
 670                 goto retry;
 671         }
 672
 673         if (port->allmulti) {
 674                 sfc_warn(sa, "all-multicast mode has been requested, "
 675                              "but the HW rejects it");
 676                 sfc_warn(sa, "all-multicast mode will be disabled");
 677
 678                 port->allmulti = B_FALSE;
 679                 rc = sfc_set_rx_mode(sa);
 680                 if (rc != 0)
 681                         return rc;
 682
 683                 goto retry;
 684         }
 685
 686         return rc;
 687 }
 688
 689 int
 690 sfc_rx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
 691 {
 692         struct sfc_port *port = &sa->port;
 693         struct sfc_rxq_info *rxq_info;
 694         struct sfc_rxq *rxq;
 695         struct sfc_evq *evq;
 696         int rc;
 697
 698         sfc_log_init(sa, "sw_index=%u", sw_index);
 699
 700         SFC_ASSERT(sw_index < sa->rxq_count);
 701
 702         rxq_info = &sa->rxq_info[sw_index];
 703         rxq = rxq_info->rxq;
 704         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 705
 706         evq = rxq->evq;
 707
 708         rc = sfc_ev_qstart(evq, sfc_evq_index_by_rxq_sw_index(sa, sw_index));
 709         if (rc != 0)
 710                 goto fail_ev_qstart;
 711
 712         rc = efx_rx_qcreate(sa->nic, rxq->hw_index, 0, rxq_info->type,
 713                             &rxq->mem, rxq_info->entries,
 714                             0 /* not used on EF10 */, rxq_info->type_flags,
 715                             evq->common, &rxq->common);
 716         if (rc != 0)
 717                 goto fail_rx_qcreate;
 718
 719         efx_rx_qenable(rxq->common);
 720
 721         rc = sa->dp_rx->qstart(rxq->dp, evq->read_ptr);
 722         if (rc != 0)
 723                 goto fail_dp_qstart;
 724
 725         rxq->state |= SFC_RXQ_STARTED;
 726
 727         if ((sw_index == 0) && !port->isolated) {
 728                 rc = sfc_rx_default_rxq_set_filter(sa, rxq);
 729                 if (rc != 0)
 730                         goto fail_mac_filter_default_rxq_set;
 731         }
 732
 733         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 734         sa->eth_dev->data->rx_queue_state[sw_index] =
 735                 RTE_ETH_QUEUE_STATE_STARTED;
 736
 737         return 0;
 738
 739 fail_mac_filter_default_rxq_set:
 740         sa->dp_rx->qstop(rxq->dp, &rxq->evq->read_ptr);
 741
 742 fail_dp_qstart:
 743         sfc_rx_qflush(sa, sw_index);
 744
 745 fail_rx_qcreate:
 746         sfc_ev_qstop(evq);
 747
 748 fail_ev_qstart:
 749         return rc;
 750 }
 751
 752 void
 753 sfc_rx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
 754 {
 755         struct sfc_rxq_info *rxq_info;
 756         struct sfc_rxq *rxq;
 757
 758         sfc_log_init(sa, "sw_index=%u", sw_index);
 759
 760         SFC_ASSERT(sw_index < sa->rxq_count);
 761
 762         rxq_info = &sa->rxq_info[sw_index];
 763         rxq = rxq_info->rxq;
 764
 765         if (rxq->state == SFC_RXQ_INITIALIZED)
 766                 return;
 767         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 768
 769         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 770         sa->eth_dev->data->rx_queue_state[sw_index] =
 771                 RTE_ETH_QUEUE_STATE_STOPPED;
 772
 773         sa->dp_rx->qstop(rxq->dp, &rxq->evq->read_ptr);
 774
 775         if (sw_index == 0)
 776                 efx_mac_filter_default_rxq_clear(sa->nic);
 777
 778         sfc_rx_qflush(sa, sw_index);
 779
 780         rxq->state = SFC_RXQ_INITIALIZED;
 781
 782         efx_rx_qdestroy(rxq->common);
 783
 784         sfc_ev_qstop(rxq->evq);
 785 }
 786
 787 static int
 788 sfc_rx_qcheck_conf(struct sfc_adapter *sa, unsigned int rxq_max_fill_level,
 789                    const struct rte_eth_rxconf *rx_conf)
 790 {
 791         int rc = 0;
 792
 793         if (rx_conf->rx_thresh.pthresh != 0 ||
 794             rx_conf->rx_thresh.hthresh != 0 ||
 795             rx_conf->rx_thresh.wthresh != 0) {
 796                 sfc_warn(sa,
 797                         "RxQ prefetch/host/writeback thresholds are not supported");
 798         }
 799
 800         if (rx_conf->rx_free_thresh > rxq_max_fill_level) {
 801                 sfc_err(sa,
 802                         "RxQ free threshold too large: %u vs maximum %u",
 803                         rx_conf->rx_free_thresh, rxq_max_fill_level);
 804                 rc = EINVAL;
 805         }
 806
 807         if (rx_conf->rx_drop_en == 0) {
 808                 sfc_err(sa, "RxQ drop disable is not supported");
 809                 rc = EINVAL;
 810         }
 811
 812         return rc;
 813 }
 814
 815 static unsigned int
 816 sfc_rx_mbuf_data_alignment(struct rte_mempool *mb_pool)
 817 {
 818         uint32_t data_off;
 819         uint32_t order;
 820
 821         /* The mbuf object itself is always cache line aligned */
 822         order = rte_bsf32(RTE_CACHE_LINE_SIZE);
 823
 824         /* Data offset from mbuf object start */
 825         data_off = sizeof(struct rte_mbuf) + rte_pktmbuf_priv_size(mb_pool) +
 826                 RTE_PKTMBUF_HEADROOM;
 827
 828         order = MIN(order, rte_bsf32(data_off));
 829
 830         return 1u << (order - 1);
 831 }
 832
 833 static uint16_t
 834 sfc_rx_mb_pool_buf_size(struct sfc_adapter *sa, struct rte_mempool *mb_pool)
 835 {
 836         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 837         const uint32_t nic_align_start = MAX(1, encp->enc_rx_buf_align_start);
 838         const uint32_t nic_align_end = MAX(1, encp->enc_rx_buf_align_end);
 839         uint16_t buf_size;
 840         unsigned int buf_aligned;
 841         unsigned int start_alignment;
 842         unsigned int end_padding_alignment;
 843
 844         /* Below it is assumed that both alignments are power of 2 */
 845         SFC_ASSERT(rte_is_power_of_2(nic_align_start));
 846         SFC_ASSERT(rte_is_power_of_2(nic_align_end));
 847
 848         /*
 849          * mbuf is always cache line aligned, double-check
 850          * that it meets rx buffer start alignment requirements.
 851          */
 852
 853         /* Start from mbuf pool data room size */
 854         buf_size = rte_pktmbuf_data_room_size(mb_pool);
 855
 856         /* Remove headroom */
 857         if (buf_size <= RTE_PKTMBUF_HEADROOM) {
 858                 sfc_err(sa,
 859                         "RxQ mbuf pool %s object data room size %u is smaller than headroom %u",
 860                         mb_pool->name, buf_size, RTE_PKTMBUF_HEADROOM);
 861                 return 0;
 862         }
 863         buf_size -= RTE_PKTMBUF_HEADROOM;
 864
 865         /* Calculate guaranteed data start alignment */
 866         buf_aligned = sfc_rx_mbuf_data_alignment(mb_pool);
 867
 868         /* Reserve space for start alignment */
 869         if (buf_aligned < nic_align_start) {
 870                 start_alignment = nic_align_start - buf_aligned;
 871                 if (buf_size <= start_alignment) {
 872                         sfc_err(sa,
 873                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u and buffer start alignment %u required by NIC",
 874                                 mb_pool->name,
 875                                 rte_pktmbuf_data_room_size(mb_pool),
 876                                 RTE_PKTMBUF_HEADROOM, start_alignment);
 877                         return 0;
 878                 }
 879                 buf_aligned = nic_align_start;
 880                 buf_size -= start_alignment;
 881         } else {
 882                 start_alignment = 0;
 883         }
 884
 885         /* Make sure that end padding does not write beyond the buffer */
 886         if (buf_aligned < nic_align_end) {
 887                 /*
 888                  * Estimate space which can be lost. If guarnteed buffer
 889                  * size is odd, lost space is (nic_align_end - 1). More
 890                  * accurate formula is below.
 891                  */
 892                 end_padding_alignment = nic_align_end -
 893                         MIN(buf_aligned, 1u << (rte_bsf32(buf_size) - 1));
 894                 if (buf_size <= end_padding_alignment) {
 895                         sfc_err(sa,
 896                                 "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",
 897                                 mb_pool->name,
 898                                 rte_pktmbuf_data_room_size(mb_pool),
 899                                 RTE_PKTMBUF_HEADROOM, start_alignment,
 900                                 end_padding_alignment);
 901                         return 0;
 902                 }
 903                 buf_size -= end_padding_alignment;
 904         } else {
 905                 /*
 906                  * Start is aligned the same or better than end,
 907                  * just align length.
 908                  */
 909                 buf_size = P2ALIGN(buf_size, nic_align_end);
 910         }
 911
 912         return buf_size;
 913 }
 914
 915 int
 916 sfc_rx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
 917              uint16_t nb_rx_desc, unsigned int socket_id,
 918              const struct rte_eth_rxconf *rx_conf,
 919              struct rte_mempool *mb_pool)
 920 {
 921         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 922         int rc;
 923         unsigned int rxq_entries;
 924         unsigned int evq_entries;
 925         unsigned int rxq_max_fill_level;
 926         uint16_t buf_size;
 927         struct sfc_rxq_info *rxq_info;
 928         struct sfc_evq *evq;
 929         struct sfc_rxq *rxq;
 930         struct sfc_dp_rx_qcreate_info info;
 931
 932         rc = sa->dp_rx->qsize_up_rings(nb_rx_desc, &rxq_entries, &evq_entries,
 933                                        &rxq_max_fill_level);
 934         if (rc != 0)
 935                 goto fail_size_up_rings;
 936
 937         rc = sfc_rx_qcheck_conf(sa, rxq_max_fill_level, rx_conf);
 938         if (rc != 0)
 939                 goto fail_bad_conf;
 940
 941         buf_size = sfc_rx_mb_pool_buf_size(sa, mb_pool);
 942         if (buf_size == 0) {
 943                 sfc_err(sa, "RxQ %u mbuf pool object size is too small",
 944                         sw_index);
 945                 rc = EINVAL;
 946                 goto fail_bad_conf;
 947         }
 948
 949         if ((buf_size < sa->port.pdu + encp->enc_rx_prefix_size) &&
 950             !sa->eth_dev->data->dev_conf.rxmode.enable_scatter) {
 951                 sfc_err(sa, "Rx scatter is disabled and RxQ %u mbuf pool "
 952                         "object size is too small", sw_index);
 953                 sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
 954                         "PDU size %u plus Rx prefix %u bytes",
 955                         sw_index, buf_size, (unsigned int)sa->port.pdu,
 956                         encp->enc_rx_prefix_size);
 957                 rc = EINVAL;
 958                 goto fail_bad_conf;
 959         }
 960
 961         SFC_ASSERT(sw_index < sa->rxq_count);
 962         rxq_info = &sa->rxq_info[sw_index];
 963
 964         SFC_ASSERT(rxq_entries <= rxq_info->max_entries);
 965         rxq_info->entries = rxq_entries;
 966         rxq_info->type = EFX_RXQ_TYPE_DEFAULT;
 967         rxq_info->type_flags =
 968                 sa->eth_dev->data->dev_conf.rxmode.enable_scatter ?
 969                 EFX_RXQ_FLAG_SCATTER : EFX_RXQ_FLAG_NONE;
 970
 971         if ((encp->enc_tunnel_encapsulations_supported != 0) &&
 972             (sa->dp_rx->features & SFC_DP_RX_FEAT_TUNNELS))
 973                 rxq_info->type_flags |= EFX_RXQ_FLAG_INNER_CLASSES;
 974
 975         rc = sfc_ev_qinit(sa, SFC_EVQ_TYPE_RX, sw_index,
 976                           evq_entries, socket_id, &evq);
 977         if (rc != 0)
 978                 goto fail_ev_qinit;
 979
 980         rc = ENOMEM;
 981         rxq = rte_zmalloc_socket("sfc-rxq", sizeof(*rxq), RTE_CACHE_LINE_SIZE,
 982                                  socket_id);
 983         if (rxq == NULL)
 984                 goto fail_rxq_alloc;
 985
 986         rxq_info->rxq = rxq;
 987
 988         rxq->evq = evq;
 989         rxq->hw_index = sw_index;
 990         rxq->refill_threshold =
 991                 RTE_MAX(rx_conf->rx_free_thresh, SFC_RX_REFILL_BULK);
 992         rxq->refill_mb_pool = mb_pool;
 993
 994         rc = sfc_dma_alloc(sa, "rxq", sw_index, EFX_RXQ_SIZE(rxq_info->entries),
 995                            socket_id, &rxq->mem);
 996         if (rc != 0)
 997                 goto fail_dma_alloc;
 998
 999         memset(&info, 0, sizeof(info));
1000         info.refill_mb_pool = rxq->refill_mb_pool;
1001         info.max_fill_level = rxq_max_fill_level;
1002         info.refill_threshold = rxq->refill_threshold;
1003         info.buf_size = buf_size;
1004         info.batch_max = encp->enc_rx_batch_max;
1005         info.prefix_size = encp->enc_rx_prefix_size;
1006
1007 #if EFSYS_OPT_RX_SCALE
1008         if (sa->hash_support == EFX_RX_HASH_AVAILABLE && sa->rss_channels > 0)
1009                 info.flags |= SFC_RXQ_FLAG_RSS_HASH;
1010 #endif
1011
1012         info.rxq_entries = rxq_info->entries;
1013         info.rxq_hw_ring = rxq->mem.esm_base;
1014         info.evq_entries = evq_entries;
1015         info.evq_hw_ring = evq->mem.esm_base;
1016         info.hw_index = rxq->hw_index;
1017         info.mem_bar = sa->mem_bar.esb_base;
1018
1019         rc = sa->dp_rx->qcreate(sa->eth_dev->data->port_id, sw_index,
1020                                 &RTE_ETH_DEV_TO_PCI(sa->eth_dev)->addr,
1021                                 socket_id, &info, &rxq->dp);
1022         if (rc != 0)
1023                 goto fail_dp_rx_qcreate;
1024
1025         evq->dp_rxq = rxq->dp;
1026
1027         rxq->state = SFC_RXQ_INITIALIZED;
1028
1029         rxq_info->deferred_start = (rx_conf->rx_deferred_start != 0);
1030
1031         return 0;
1032
1033 fail_dp_rx_qcreate:
1034         sfc_dma_free(sa, &rxq->mem);
1035
1036 fail_dma_alloc:
1037         rxq_info->rxq = NULL;
1038         rte_free(rxq);
1039
1040 fail_rxq_alloc:
1041         sfc_ev_qfini(evq);
1042
1043 fail_ev_qinit:
1044         rxq_info->entries = 0;
1045
1046 fail_bad_conf:
1047 fail_size_up_rings:
1048         sfc_log_init(sa, "failed %d", rc);
1049         return rc;
1050 }
1051
1052 void
1053 sfc_rx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
1054 {
1055         struct sfc_rxq_info *rxq_info;
1056         struct sfc_rxq *rxq;
1057
1058         SFC_ASSERT(sw_index < sa->rxq_count);
1059
1060         rxq_info = &sa->rxq_info[sw_index];
1061
1062         rxq = rxq_info->rxq;
1063         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
1064
1065         sa->dp_rx->qdestroy(rxq->dp);
1066         rxq->dp = NULL;
1067
1068         rxq_info->rxq = NULL;
1069         rxq_info->entries = 0;
1070
1071         sfc_dma_free(sa, &rxq->mem);
1072
1073         sfc_ev_qfini(rxq->evq);
1074         rxq->evq = NULL;
1075
1076         rte_free(rxq);
1077 }
1078
1079 #if EFSYS_OPT_RX_SCALE
1080 efx_rx_hash_type_t
1081 sfc_rte_to_efx_hash_type(uint64_t rss_hf)
1082 {
1083         efx_rx_hash_type_t efx_hash_types = 0;
1084
1085         if ((rss_hf & (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
1086                        ETH_RSS_NONFRAG_IPV4_OTHER)) != 0)
1087                 efx_hash_types |= EFX_RX_HASH_IPV4;
1088
1089         if ((rss_hf & ETH_RSS_NONFRAG_IPV4_TCP) != 0)
1090                 efx_hash_types |= EFX_RX_HASH_TCPIPV4;
1091
1092         if ((rss_hf & (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
1093                         ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX)) != 0)
1094                 efx_hash_types |= EFX_RX_HASH_IPV6;
1095
1096         if ((rss_hf & (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX)) != 0)
1097                 efx_hash_types |= EFX_RX_HASH_TCPIPV6;
1098
1099         return efx_hash_types;
1100 }
1101
1102 uint64_t
1103 sfc_efx_to_rte_hash_type(efx_rx_hash_type_t efx_hash_types)
1104 {
1105         uint64_t rss_hf = 0;
1106
1107         if ((efx_hash_types & EFX_RX_HASH_IPV4) != 0)
1108                 rss_hf |= (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
1109                            ETH_RSS_NONFRAG_IPV4_OTHER);
1110
1111         if ((efx_hash_types & EFX_RX_HASH_TCPIPV4) != 0)
1112                 rss_hf |= ETH_RSS_NONFRAG_IPV4_TCP;
1113
1114         if ((efx_hash_types & EFX_RX_HASH_IPV6) != 0)
1115                 rss_hf |= (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
1116                            ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX);
1117
1118         if ((efx_hash_types & EFX_RX_HASH_TCPIPV6) != 0)
1119                 rss_hf |= (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX);
1120
1121         return rss_hf;
1122 }
1123 #endif
1124
1125 #if EFSYS_OPT_RX_SCALE
1126 static int
1127 sfc_rx_rss_config(struct sfc_adapter *sa)
1128 {
1129         int rc = 0;
1130
1131         if (sa->rss_channels > 0) {
1132                 rc = efx_rx_scale_mode_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1133                                            EFX_RX_HASHALG_TOEPLITZ,
1134                                            sa->rss_hash_types, B_TRUE);
1135                 if (rc != 0)
1136                         goto finish;
1137
1138                 rc = efx_rx_scale_key_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1139                                           sa->rss_key,
1140                                           sizeof(sa->rss_key));
1141                 if (rc != 0)
1142                         goto finish;
1143
1144                 rc = efx_rx_scale_tbl_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1145                                           sa->rss_tbl, RTE_DIM(sa->rss_tbl));
1146         }
1147
1148 finish:
1149         return rc;
1150 }
1151 #else
1152 static int
1153 sfc_rx_rss_config(__rte_unused struct sfc_adapter *sa)
1154 {
1155         return 0;
1156 }
1157 #endif
1158
1159 int
1160 sfc_rx_start(struct sfc_adapter *sa)
1161 {
1162         unsigned int sw_index;
1163         int rc;
1164
1165         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
1166
1167         rc = efx_rx_init(sa->nic);
1168         if (rc != 0)
1169                 goto fail_rx_init;
1170
1171         rc = sfc_rx_rss_config(sa);
1172         if (rc != 0)
1173                 goto fail_rss_config;
1174
1175         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
1176                 if ((!sa->rxq_info[sw_index].deferred_start ||
1177                      sa->rxq_info[sw_index].deferred_started)) {
1178                         rc = sfc_rx_qstart(sa, sw_index);
1179                         if (rc != 0)
1180                                 goto fail_rx_qstart;
1181                 }
1182         }
1183
1184         return 0;
1185
1186 fail_rx_qstart:
1187         while (sw_index-- > 0)
1188                 sfc_rx_qstop(sa, sw_index);
1189
1190 fail_rss_config:
1191         efx_rx_fini(sa->nic);
1192
1193 fail_rx_init:
1194         sfc_log_init(sa, "failed %d", rc);
1195         return rc;
1196 }
1197
1198 void
1199 sfc_rx_stop(struct sfc_adapter *sa)
1200 {
1201         unsigned int sw_index;
1202
1203         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
1204
1205         sw_index = sa->rxq_count;
1206         while (sw_index-- > 0) {
1207                 if (sa->rxq_info[sw_index].rxq != NULL)
1208                         sfc_rx_qstop(sa, sw_index);
1209         }
1210
1211         efx_rx_fini(sa->nic);
1212 }
1213
1214 static int
1215 sfc_rx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
1216 {
1217         struct sfc_rxq_info *rxq_info = &sa->rxq_info[sw_index];
1218         unsigned int max_entries;
1219
1220         max_entries = EFX_RXQ_MAXNDESCS;
1221         SFC_ASSERT(rte_is_power_of_2(max_entries));
1222
1223         rxq_info->max_entries = max_entries;
1224
1225         return 0;
1226 }
1227
1228 static int
1229 sfc_rx_check_mode(struct sfc_adapter *sa, struct rte_eth_rxmode *rxmode)
1230 {
1231         int rc = 0;
1232
1233         switch (rxmode->mq_mode) {
1234         case ETH_MQ_RX_NONE:
1235                 /* No special checks are required */
1236                 break;
1237 #if EFSYS_OPT_RX_SCALE
1238         case ETH_MQ_RX_RSS:
1239                 if (sa->rss_support == EFX_RX_SCALE_UNAVAILABLE) {
1240                         sfc_err(sa, "RSS is not available");
1241                         rc = EINVAL;
1242                 }
1243                 break;
1244 #endif
1245         default:
1246                 sfc_err(sa, "Rx multi-queue mode %u not supported",
1247                         rxmode->mq_mode);
1248                 rc = EINVAL;
1249         }
1250
1251         if (rxmode->header_split) {
1252                 sfc_err(sa, "Header split on Rx not supported");
1253                 rc = EINVAL;
1254         }
1255
1256         if (rxmode->hw_vlan_filter) {
1257                 sfc_err(sa, "HW VLAN filtering not supported");
1258                 rc = EINVAL;
1259         }
1260
1261         if (rxmode->hw_vlan_strip) {
1262                 sfc_err(sa, "HW VLAN stripping not supported");
1263                 rc = EINVAL;
1264         }
1265
1266         if (rxmode->hw_vlan_extend) {
1267                 sfc_err(sa,
1268                         "Q-in-Q HW VLAN stripping not supported");
1269                 rc = EINVAL;
1270         }
1271
1272         if (!rxmode->hw_strip_crc) {
1273                 sfc_warn(sa,
1274                          "FCS stripping control not supported - always stripped");
1275                 rxmode->hw_strip_crc = 1;
1276         }
1277
1278         if (rxmode->enable_scatter &&
1279             (~sa->dp_rx->features & SFC_DP_RX_FEAT_SCATTER)) {
1280                 sfc_err(sa, "Rx scatter not supported by %s datapath",
1281                         sa->dp_rx->dp.name);
1282                 rc = EINVAL;
1283         }
1284
1285         if (rxmode->enable_lro) {
1286                 sfc_err(sa, "LRO not supported");
1287                 rc = EINVAL;
1288         }
1289
1290         return rc;
1291 }
1292
1293 /**
1294  * Destroy excess queues that are no longer needed after reconfiguration
1295  * or complete close.
1296  */
1297 static void
1298 sfc_rx_fini_queues(struct sfc_adapter *sa, unsigned int nb_rx_queues)
1299 {
1300         int sw_index;
1301
1302         SFC_ASSERT(nb_rx_queues <= sa->rxq_count);
1303
1304         sw_index = sa->rxq_count;
1305         while (--sw_index >= (int)nb_rx_queues) {
1306                 if (sa->rxq_info[sw_index].rxq != NULL)
1307                         sfc_rx_qfini(sa, sw_index);
1308         }
1309
1310         sa->rxq_count = nb_rx_queues;
1311 }
1312
1313 /**
1314  * Initialize Rx subsystem.
1315  *
1316  * Called at device (re)configuration stage when number of receive queues is
1317  * specified together with other device level receive configuration.
1318  *
1319  * It should be used to allocate NUMA-unaware resources.
1320  */
1321 int
1322 sfc_rx_configure(struct sfc_adapter *sa)
1323 {
1324         struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
1325         const unsigned int nb_rx_queues = sa->eth_dev->data->nb_rx_queues;
1326         int rc;
1327
1328         sfc_log_init(sa, "nb_rx_queues=%u (old %u)",
1329                      nb_rx_queues, sa->rxq_count);
1330
1331         rc = sfc_rx_check_mode(sa, &dev_conf->rxmode);
1332         if (rc != 0)
1333                 goto fail_check_mode;
1334
1335         if (nb_rx_queues == sa->rxq_count)
1336                 goto done;
1337
1338         if (sa->rxq_info == NULL) {
1339                 rc = ENOMEM;
1340                 sa->rxq_info = rte_calloc_socket("sfc-rxqs", nb_rx_queues,
1341                                                  sizeof(sa->rxq_info[0]), 0,
1342                                                  sa->socket_id);
1343                 if (sa->rxq_info == NULL)
1344                         goto fail_rxqs_alloc;
1345         } else {
1346                 struct sfc_rxq_info *new_rxq_info;
1347
1348                 if (nb_rx_queues < sa->rxq_count)
1349                         sfc_rx_fini_queues(sa, nb_rx_queues);
1350
1351                 rc = ENOMEM;
1352                 new_rxq_info =
1353                         rte_realloc(sa->rxq_info,
1354                                     nb_rx_queues * sizeof(sa->rxq_info[0]), 0);
1355                 if (new_rxq_info == NULL && nb_rx_queues > 0)
1356                         goto fail_rxqs_realloc;
1357
1358                 sa->rxq_info = new_rxq_info;
1359                 if (nb_rx_queues > sa->rxq_count)
1360                         memset(&sa->rxq_info[sa->rxq_count], 0,
1361                                (nb_rx_queues - sa->rxq_count) *
1362                                sizeof(sa->rxq_info[0]));
1363         }
1364
1365         while (sa->rxq_count < nb_rx_queues) {
1366                 rc = sfc_rx_qinit_info(sa, sa->rxq_count);
1367                 if (rc != 0)
1368                         goto fail_rx_qinit_info;
1369
1370                 sa->rxq_count++;
1371         }
1372
1373 #if EFSYS_OPT_RX_SCALE
1374         sa->rss_channels = (dev_conf->rxmode.mq_mode == ETH_MQ_RX_RSS) ?
1375                            MIN(sa->rxq_count, EFX_MAXRSS) : 0;
1376
1377         if (sa->rss_channels > 0) {
1378                 unsigned int sw_index;
1379
1380                 for (sw_index = 0; sw_index < EFX_RSS_TBL_SIZE; ++sw_index)
1381                         sa->rss_tbl[sw_index] = sw_index % sa->rss_channels;
1382         }
1383 #endif
1384
1385 done:
1386         return 0;
1387
1388 fail_rx_qinit_info:
1389 fail_rxqs_realloc:
1390 fail_rxqs_alloc:
1391         sfc_rx_close(sa);
1392
1393 fail_check_mode:
1394         sfc_log_init(sa, "failed %d", rc);
1395         return rc;
1396 }
1397
1398 /**
1399  * Shutdown Rx subsystem.
1400  *
1401  * Called at device close stage, for example, before device shutdown.
1402  */
1403 void
1404 sfc_rx_close(struct sfc_adapter *sa)
1405 {
1406         sfc_rx_fini_queues(sa, 0);
1407
1408         sa->rss_channels = 0;
1409
1410         rte_free(sa->rxq_info);
1411         sa->rxq_info = NULL;
1412 }