drivers/net/sfc/sfc_rx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (c) 2016-2018 Solarflare Communications Inc.
   4  * All rights reserved.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 #include <rte_mempool.h>
  11
  12 #include "efx.h"
  13
  14 #include "sfc.h"
  15 #include "sfc_debug.h"
  16 #include "sfc_log.h"
  17 #include "sfc_ev.h"
  18 #include "sfc_rx.h"
  19 #include "sfc_kvargs.h"
  20 #include "sfc_tweak.h"
  21
  22 /*
  23  * Maximum number of Rx queue flush attempt in the case of failure or
  24  * flush timeout
  25  */
  26 #define SFC_RX_QFLUSH_ATTEMPTS          (3)
  27
  28 /*
  29  * Time to wait between event queue polling attempts when waiting for Rx
  30  * queue flush done or failed events.
  31  */
  32 #define SFC_RX_QFLUSH_POLL_WAIT_MS      (1)
  33
  34 /*
  35  * Maximum number of event queue polling attempts when waiting for Rx queue
  36  * flush done or failed events. It defines Rx queue flush attempt timeout
  37  * together with SFC_RX_QFLUSH_POLL_WAIT_MS.
  38  */
  39 #define SFC_RX_QFLUSH_POLL_ATTEMPTS     (2000)
  40
  41 void
  42 sfc_rx_qflush_done(struct sfc_rxq *rxq)
  43 {
  44         rxq->state |= SFC_RXQ_FLUSHED;
  45         rxq->state &= ~SFC_RXQ_FLUSHING;
  46 }
  47
  48 void
  49 sfc_rx_qflush_failed(struct sfc_rxq *rxq)
  50 {
  51         rxq->state |= SFC_RXQ_FLUSH_FAILED;
  52         rxq->state &= ~SFC_RXQ_FLUSHING;
  53 }
  54
  55 static void
  56 sfc_efx_rx_qrefill(struct sfc_efx_rxq *rxq)
  57 {
  58         unsigned int free_space;
  59         unsigned int bulks;
  60         void *objs[SFC_RX_REFILL_BULK];
  61         efsys_dma_addr_t addr[RTE_DIM(objs)];
  62         unsigned int added = rxq->added;
  63         unsigned int id;
  64         unsigned int i;
  65         struct sfc_efx_rx_sw_desc *rxd;
  66         struct rte_mbuf *m;
  67         uint16_t port_id = rxq->dp.dpq.port_id;
  68
  69         free_space = rxq->max_fill_level - (added - rxq->completed);
  70
  71         if (free_space < rxq->refill_threshold)
  72                 return;
  73
  74         bulks = free_space / RTE_DIM(objs);
  75         /* refill_threshold guarantees that bulks is positive */
  76         SFC_ASSERT(bulks > 0);
  77
  78         id = added & rxq->ptr_mask;
  79         do {
  80                 if (unlikely(rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
  81                                                   RTE_DIM(objs)) < 0)) {
  82                         /*
  83                          * It is hardly a safe way to increment counter
  84                          * from different contexts, but all PMDs do it.
  85                          */
  86                         rxq->evq->sa->eth_dev->data->rx_mbuf_alloc_failed +=
  87                                 RTE_DIM(objs);
  88                         /* Return if we have posted nothing yet */
  89                         if (added == rxq->added)
  90                                 return;
  91                         /* Push posted */
  92                         break;
  93                 }
  94
  95                 for (i = 0; i < RTE_DIM(objs);
  96                      ++i, id = (id + 1) & rxq->ptr_mask) {
  97                         m = objs[i];
  98
  99                         rxd = &rxq->sw_desc[id];
 100                         rxd->mbuf = m;
 101
 102                         SFC_ASSERT(rte_mbuf_refcnt_read(m) == 1);
 103                         m->data_off = RTE_PKTMBUF_HEADROOM;
 104                         SFC_ASSERT(m->next == NULL);
 105                         SFC_ASSERT(m->nb_segs == 1);
 106                         m->port = port_id;
 107
 108                         addr[i] = rte_pktmbuf_iova(m);
 109                 }
 110
 111                 efx_rx_qpost(rxq->common, addr, rxq->buf_size,
 112                              RTE_DIM(objs), rxq->completed, added);
 113                 added += RTE_DIM(objs);
 114         } while (--bulks > 0);
 115
 116         SFC_ASSERT(added != rxq->added);
 117         rxq->added = added;
 118         efx_rx_qpush(rxq->common, added, &rxq->pushed);
 119 }
 120
 121 static uint64_t
 122 sfc_efx_rx_desc_flags_to_offload_flags(const unsigned int desc_flags)
 123 {
 124         uint64_t mbuf_flags = 0;
 125
 126         switch (desc_flags & (EFX_PKT_IPV4 | EFX_CKSUM_IPV4)) {
 127         case (EFX_PKT_IPV4 | EFX_CKSUM_IPV4):
 128                 mbuf_flags |= PKT_RX_IP_CKSUM_GOOD;
 129                 break;
 130         case EFX_PKT_IPV4:
 131                 mbuf_flags |= PKT_RX_IP_CKSUM_BAD;
 132                 break;
 133         default:
 134                 RTE_BUILD_BUG_ON(PKT_RX_IP_CKSUM_UNKNOWN != 0);
 135                 SFC_ASSERT((mbuf_flags & PKT_RX_IP_CKSUM_MASK) ==
 136                            PKT_RX_IP_CKSUM_UNKNOWN);
 137                 break;
 138         }
 139
 140         switch ((desc_flags &
 141                  (EFX_PKT_TCP | EFX_PKT_UDP | EFX_CKSUM_TCPUDP))) {
 142         case (EFX_PKT_TCP | EFX_CKSUM_TCPUDP):
 143         case (EFX_PKT_UDP | EFX_CKSUM_TCPUDP):
 144                 mbuf_flags |= PKT_RX_L4_CKSUM_GOOD;
 145                 break;
 146         case EFX_PKT_TCP:
 147         case EFX_PKT_UDP:
 148                 mbuf_flags |= PKT_RX_L4_CKSUM_BAD;
 149                 break;
 150         default:
 151                 RTE_BUILD_BUG_ON(PKT_RX_L4_CKSUM_UNKNOWN != 0);
 152                 SFC_ASSERT((mbuf_flags & PKT_RX_L4_CKSUM_MASK) ==
 153                            PKT_RX_L4_CKSUM_UNKNOWN);
 154                 break;
 155         }
 156
 157         return mbuf_flags;
 158 }
 159
 160 static uint32_t
 161 sfc_efx_rx_desc_flags_to_packet_type(const unsigned int desc_flags)
 162 {
 163         return RTE_PTYPE_L2_ETHER |
 164                 ((desc_flags & EFX_PKT_IPV4) ?
 165                         RTE_PTYPE_L3_IPV4_EXT_UNKNOWN : 0) |
 166                 ((desc_flags & EFX_PKT_IPV6) ?
 167                         RTE_PTYPE_L3_IPV6_EXT_UNKNOWN : 0) |
 168                 ((desc_flags & EFX_PKT_TCP) ? RTE_PTYPE_L4_TCP : 0) |
 169                 ((desc_flags & EFX_PKT_UDP) ? RTE_PTYPE_L4_UDP : 0);
 170 }
 171
 172 static const uint32_t *
 173 sfc_efx_supported_ptypes_get(__rte_unused uint32_t tunnel_encaps)
 174 {
 175         static const uint32_t ptypes[] = {
 176                 RTE_PTYPE_L2_ETHER,
 177                 RTE_PTYPE_L3_IPV4_EXT_UNKNOWN,
 178                 RTE_PTYPE_L3_IPV6_EXT_UNKNOWN,
 179                 RTE_PTYPE_L4_TCP,
 180                 RTE_PTYPE_L4_UDP,
 181                 RTE_PTYPE_UNKNOWN
 182         };
 183
 184         return ptypes;
 185 }
 186
 187 #if EFSYS_OPT_RX_SCALE
 188 static void
 189 sfc_efx_rx_set_rss_hash(struct sfc_efx_rxq *rxq, unsigned int flags,
 190                         struct rte_mbuf *m)
 191 {
 192         uint8_t *mbuf_data;
 193
 194
 195         if ((rxq->flags & SFC_EFX_RXQ_FLAG_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 }
 208 #else
 209 static void
 210 sfc_efx_rx_set_rss_hash(__rte_unused struct sfc_efx_rxq *rxq,
 211                         __rte_unused unsigned int flags,
 212                         __rte_unused struct rte_mbuf *m)
 213 {
 214 }
 215 #endif
 216
 217 static uint16_t
 218 sfc_efx_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 219 {
 220         struct sfc_dp_rxq *dp_rxq = rx_queue;
 221         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 222         unsigned int completed;
 223         unsigned int prefix_size = rxq->prefix_size;
 224         unsigned int done_pkts = 0;
 225         boolean_t discard_next = B_FALSE;
 226         struct rte_mbuf *scatter_pkt = NULL;
 227
 228         if (unlikely((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) == 0))
 229                 return 0;
 230
 231         sfc_ev_qpoll(rxq->evq);
 232
 233         completed = rxq->completed;
 234         while (completed != rxq->pending && done_pkts < nb_pkts) {
 235                 unsigned int id;
 236                 struct sfc_efx_rx_sw_desc *rxd;
 237                 struct rte_mbuf *m;
 238                 unsigned int seg_len;
 239                 unsigned int desc_flags;
 240
 241                 id = completed++ & rxq->ptr_mask;
 242                 rxd = &rxq->sw_desc[id];
 243                 m = rxd->mbuf;
 244                 desc_flags = rxd->flags;
 245
 246                 if (discard_next)
 247                         goto discard;
 248
 249                 if (desc_flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))
 250                         goto discard;
 251
 252                 if (desc_flags & EFX_PKT_PREFIX_LEN) {
 253                         uint16_t tmp_size;
 254                         int rc __rte_unused;
 255
 256                         rc = efx_pseudo_hdr_pkt_length_get(rxq->common,
 257                                 rte_pktmbuf_mtod(m, uint8_t *), &tmp_size);
 258                         SFC_ASSERT(rc == 0);
 259                         seg_len = tmp_size;
 260                 } else {
 261                         seg_len = rxd->size - prefix_size;
 262                 }
 263
 264                 rte_pktmbuf_data_len(m) = seg_len;
 265                 rte_pktmbuf_pkt_len(m) = seg_len;
 266
 267                 if (scatter_pkt != NULL) {
 268                         if (rte_pktmbuf_chain(scatter_pkt, m) != 0) {
 269                                 rte_pktmbuf_free(scatter_pkt);
 270                                 goto discard;
 271                         }
 272                         /* The packet to deliver */
 273                         m = scatter_pkt;
 274                 }
 275
 276                 if (desc_flags & EFX_PKT_CONT) {
 277                         /* The packet is scattered, more fragments to come */
 278                         scatter_pkt = m;
 279                         /* Further fragments have no prefix */
 280                         prefix_size = 0;
 281                         continue;
 282                 }
 283
 284                 /* Scattered packet is done */
 285                 scatter_pkt = NULL;
 286                 /* The first fragment of the packet has prefix */
 287                 prefix_size = rxq->prefix_size;
 288
 289                 m->ol_flags =
 290                         sfc_efx_rx_desc_flags_to_offload_flags(desc_flags);
 291                 m->packet_type =
 292                         sfc_efx_rx_desc_flags_to_packet_type(desc_flags);
 293
 294                 /*
 295                  * Extract RSS hash from the packet prefix and
 296                  * set the corresponding field (if needed and possible)
 297                  */
 298                 sfc_efx_rx_set_rss_hash(rxq, desc_flags, m);
 299
 300                 m->data_off += prefix_size;
 301
 302                 *rx_pkts++ = m;
 303                 done_pkts++;
 304                 continue;
 305
 306 discard:
 307                 discard_next = ((desc_flags & EFX_PKT_CONT) != 0);
 308                 rte_mempool_put(rxq->refill_mb_pool, m);
 309                 rxd->mbuf = NULL;
 310         }
 311
 312         /* pending is only moved when entire packet is received */
 313         SFC_ASSERT(scatter_pkt == NULL);
 314
 315         rxq->completed = completed;
 316
 317         sfc_efx_rx_qrefill(rxq);
 318
 319         return done_pkts;
 320 }
 321
 322 static sfc_dp_rx_qdesc_npending_t sfc_efx_rx_qdesc_npending;
 323 static unsigned int
 324 sfc_efx_rx_qdesc_npending(struct sfc_dp_rxq *dp_rxq)
 325 {
 326         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 327
 328         if ((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) == 0)
 329                 return 0;
 330
 331         sfc_ev_qpoll(rxq->evq);
 332
 333         return rxq->pending - rxq->completed;
 334 }
 335
 336 static sfc_dp_rx_qdesc_status_t sfc_efx_rx_qdesc_status;
 337 static int
 338 sfc_efx_rx_qdesc_status(struct sfc_dp_rxq *dp_rxq, uint16_t offset)
 339 {
 340         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 341
 342         if (unlikely(offset > rxq->ptr_mask))
 343                 return -EINVAL;
 344
 345         /*
 346          * Poll EvQ to derive up-to-date 'rxq->pending' figure;
 347          * it is required for the queue to be running, but the
 348          * check is omitted because API design assumes that it
 349          * is the duty of the caller to satisfy all conditions
 350          */
 351         SFC_ASSERT((rxq->flags & SFC_EFX_RXQ_FLAG_RUNNING) ==
 352                    SFC_EFX_RXQ_FLAG_RUNNING);
 353         sfc_ev_qpoll(rxq->evq);
 354
 355         /*
 356          * There is a handful of reserved entries in the ring,
 357          * but an explicit check whether the offset points to
 358          * a reserved entry is neglected since the two checks
 359          * below rely on the figures which take the HW limits
 360          * into account and thus if an entry is reserved, the
 361          * checks will fail and UNAVAIL code will be returned
 362          */
 363
 364         if (offset < (rxq->pending - rxq->completed))
 365                 return RTE_ETH_RX_DESC_DONE;
 366
 367         if (offset < (rxq->added - rxq->completed))
 368                 return RTE_ETH_RX_DESC_AVAIL;
 369
 370         return RTE_ETH_RX_DESC_UNAVAIL;
 371 }
 372
 373 struct sfc_rxq *
 374 sfc_rxq_by_dp_rxq(const struct sfc_dp_rxq *dp_rxq)
 375 {
 376         const struct sfc_dp_queue *dpq = &dp_rxq->dpq;
 377         struct rte_eth_dev *eth_dev;
 378         struct sfc_adapter *sa;
 379         struct sfc_rxq *rxq;
 380
 381         SFC_ASSERT(rte_eth_dev_is_valid_port(dpq->port_id));
 382         eth_dev = &rte_eth_devices[dpq->port_id];
 383
 384         sa = eth_dev->data->dev_private;
 385
 386         SFC_ASSERT(dpq->queue_id < sa->rxq_count);
 387         rxq = sa->rxq_info[dpq->queue_id].rxq;
 388
 389         SFC_ASSERT(rxq != NULL);
 390         return rxq;
 391 }
 392
 393 static sfc_dp_rx_qsize_up_rings_t sfc_efx_rx_qsize_up_rings;
 394 static int
 395 sfc_efx_rx_qsize_up_rings(uint16_t nb_rx_desc,
 396                           unsigned int *rxq_entries,
 397                           unsigned int *evq_entries,
 398                           unsigned int *rxq_max_fill_level)
 399 {
 400         *rxq_entries = nb_rx_desc;
 401         *evq_entries = nb_rx_desc;
 402         *rxq_max_fill_level = EFX_RXQ_LIMIT(*rxq_entries);
 403         return 0;
 404 }
 405
 406 static sfc_dp_rx_qcreate_t sfc_efx_rx_qcreate;
 407 static int
 408 sfc_efx_rx_qcreate(uint16_t port_id, uint16_t queue_id,
 409                    const struct rte_pci_addr *pci_addr, int socket_id,
 410                    const struct sfc_dp_rx_qcreate_info *info,
 411                    struct sfc_dp_rxq **dp_rxqp)
 412 {
 413         struct sfc_efx_rxq *rxq;
 414         int rc;
 415
 416         rc = ENOMEM;
 417         rxq = rte_zmalloc_socket("sfc-efx-rxq", sizeof(*rxq),
 418                                  RTE_CACHE_LINE_SIZE, socket_id);
 419         if (rxq == NULL)
 420                 goto fail_rxq_alloc;
 421
 422         sfc_dp_queue_init(&rxq->dp.dpq, port_id, queue_id, pci_addr);
 423
 424         rc = ENOMEM;
 425         rxq->sw_desc = rte_calloc_socket("sfc-efx-rxq-sw_desc",
 426                                          info->rxq_entries,
 427                                          sizeof(*rxq->sw_desc),
 428                                          RTE_CACHE_LINE_SIZE, socket_id);
 429         if (rxq->sw_desc == NULL)
 430                 goto fail_desc_alloc;
 431
 432         /* efx datapath is bound to efx control path */
 433         rxq->evq = sfc_rxq_by_dp_rxq(&rxq->dp)->evq;
 434         if (info->flags & SFC_RXQ_FLAG_RSS_HASH)
 435                 rxq->flags |= SFC_EFX_RXQ_FLAG_RSS_HASH;
 436         rxq->ptr_mask = info->rxq_entries - 1;
 437         rxq->batch_max = info->batch_max;
 438         rxq->prefix_size = info->prefix_size;
 439         rxq->max_fill_level = info->max_fill_level;
 440         rxq->refill_threshold = info->refill_threshold;
 441         rxq->buf_size = info->buf_size;
 442         rxq->refill_mb_pool = info->refill_mb_pool;
 443
 444         *dp_rxqp = &rxq->dp;
 445         return 0;
 446
 447 fail_desc_alloc:
 448         rte_free(rxq);
 449
 450 fail_rxq_alloc:
 451         return rc;
 452 }
 453
 454 static sfc_dp_rx_qdestroy_t sfc_efx_rx_qdestroy;
 455 static void
 456 sfc_efx_rx_qdestroy(struct sfc_dp_rxq *dp_rxq)
 457 {
 458         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 459
 460         rte_free(rxq->sw_desc);
 461         rte_free(rxq);
 462 }
 463
 464 static sfc_dp_rx_qstart_t sfc_efx_rx_qstart;
 465 static int
 466 sfc_efx_rx_qstart(struct sfc_dp_rxq *dp_rxq,
 467                   __rte_unused unsigned int evq_read_ptr)
 468 {
 469         /* libefx-based datapath is specific to libefx-based PMD */
 470         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 471         struct sfc_rxq *crxq = sfc_rxq_by_dp_rxq(dp_rxq);
 472
 473         rxq->common = crxq->common;
 474
 475         rxq->pending = rxq->completed = rxq->added = rxq->pushed = 0;
 476
 477         sfc_efx_rx_qrefill(rxq);
 478
 479         rxq->flags |= (SFC_EFX_RXQ_FLAG_STARTED | SFC_EFX_RXQ_FLAG_RUNNING);
 480
 481         return 0;
 482 }
 483
 484 static sfc_dp_rx_qstop_t sfc_efx_rx_qstop;
 485 static void
 486 sfc_efx_rx_qstop(struct sfc_dp_rxq *dp_rxq,
 487                  __rte_unused unsigned int *evq_read_ptr)
 488 {
 489         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 490
 491         rxq->flags &= ~SFC_EFX_RXQ_FLAG_RUNNING;
 492
 493         /* libefx-based datapath is bound to libefx-based PMD and uses
 494          * event queue structure directly. So, there is no necessity to
 495          * return EvQ read pointer.
 496          */
 497 }
 498
 499 static sfc_dp_rx_qpurge_t sfc_efx_rx_qpurge;
 500 static void
 501 sfc_efx_rx_qpurge(struct sfc_dp_rxq *dp_rxq)
 502 {
 503         struct sfc_efx_rxq *rxq = sfc_efx_rxq_by_dp_rxq(dp_rxq);
 504         unsigned int i;
 505         struct sfc_efx_rx_sw_desc *rxd;
 506
 507         for (i = rxq->completed; i != rxq->added; ++i) {
 508                 rxd = &rxq->sw_desc[i & rxq->ptr_mask];
 509                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
 510                 rxd->mbuf = NULL;
 511                 /* Packed stream relies on 0 in inactive SW desc.
 512                  * Rx queue stop is not performance critical, so
 513                  * there is no harm to do it always.
 514                  */
 515                 rxd->flags = 0;
 516                 rxd->size = 0;
 517         }
 518
 519         rxq->flags &= ~SFC_EFX_RXQ_FLAG_STARTED;
 520 }
 521
 522 struct sfc_dp_rx sfc_efx_rx = {
 523         .dp = {
 524                 .name           = SFC_KVARG_DATAPATH_EFX,
 525                 .type           = SFC_DP_RX,
 526                 .hw_fw_caps     = 0,
 527         },
 528         .features               = SFC_DP_RX_FEAT_SCATTER,
 529         .qsize_up_rings         = sfc_efx_rx_qsize_up_rings,
 530         .qcreate                = sfc_efx_rx_qcreate,
 531         .qdestroy               = sfc_efx_rx_qdestroy,
 532         .qstart                 = sfc_efx_rx_qstart,
 533         .qstop                  = sfc_efx_rx_qstop,
 534         .qpurge                 = sfc_efx_rx_qpurge,
 535         .supported_ptypes_get   = sfc_efx_supported_ptypes_get,
 536         .qdesc_npending         = sfc_efx_rx_qdesc_npending,
 537         .qdesc_status           = sfc_efx_rx_qdesc_status,
 538         .pkt_burst              = sfc_efx_recv_pkts,
 539 };
 540
 541 unsigned int
 542 sfc_rx_qdesc_npending(struct sfc_adapter *sa, unsigned int sw_index)
 543 {
 544         struct sfc_rxq *rxq;
 545
 546         SFC_ASSERT(sw_index < sa->rxq_count);
 547         rxq = sa->rxq_info[sw_index].rxq;
 548
 549         if (rxq == NULL || (rxq->state & SFC_RXQ_STARTED) == 0)
 550                 return 0;
 551
 552         return sa->dp_rx->qdesc_npending(rxq->dp);
 553 }
 554
 555 int
 556 sfc_rx_qdesc_done(struct sfc_dp_rxq *dp_rxq, unsigned int offset)
 557 {
 558         struct sfc_rxq *rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 559
 560         return offset < rxq->evq->sa->dp_rx->qdesc_npending(dp_rxq);
 561 }
 562
 563 static void
 564 sfc_rx_qflush(struct sfc_adapter *sa, unsigned int sw_index)
 565 {
 566         struct sfc_rxq *rxq;
 567         unsigned int retry_count;
 568         unsigned int wait_count;
 569         int rc;
 570
 571         rxq = sa->rxq_info[sw_index].rxq;
 572         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 573
 574         /*
 575          * Retry Rx queue flushing in the case of flush failed or
 576          * timeout. In the worst case it can delay for 6 seconds.
 577          */
 578         for (retry_count = 0;
 579              ((rxq->state & SFC_RXQ_FLUSHED) == 0) &&
 580              (retry_count < SFC_RX_QFLUSH_ATTEMPTS);
 581              ++retry_count) {
 582                 rc = efx_rx_qflush(rxq->common);
 583                 if (rc != 0) {
 584                         rxq->state |= (rc == EALREADY) ?
 585                                 SFC_RXQ_FLUSHED : SFC_RXQ_FLUSH_FAILED;
 586                         break;
 587                 }
 588                 rxq->state &= ~SFC_RXQ_FLUSH_FAILED;
 589                 rxq->state |= SFC_RXQ_FLUSHING;
 590
 591                 /*
 592                  * Wait for Rx queue flush done or failed event at least
 593                  * SFC_RX_QFLUSH_POLL_WAIT_MS milliseconds and not more
 594                  * than 2 seconds (SFC_RX_QFLUSH_POLL_WAIT_MS multiplied
 595                  * by SFC_RX_QFLUSH_POLL_ATTEMPTS).
 596                  */
 597                 wait_count = 0;
 598                 do {
 599                         rte_delay_ms(SFC_RX_QFLUSH_POLL_WAIT_MS);
 600                         sfc_ev_qpoll(rxq->evq);
 601                 } while ((rxq->state & SFC_RXQ_FLUSHING) &&
 602                          (wait_count++ < SFC_RX_QFLUSH_POLL_ATTEMPTS));
 603
 604                 if (rxq->state & SFC_RXQ_FLUSHING)
 605                         sfc_err(sa, "RxQ %u flush timed out", sw_index);
 606
 607                 if (rxq->state & SFC_RXQ_FLUSH_FAILED)
 608                         sfc_err(sa, "RxQ %u flush failed", sw_index);
 609
 610                 if (rxq->state & SFC_RXQ_FLUSHED)
 611                         sfc_info(sa, "RxQ %u flushed", sw_index);
 612         }
 613
 614         sa->dp_rx->qpurge(rxq->dp);
 615 }
 616
 617 static int
 618 sfc_rx_default_rxq_set_filter(struct sfc_adapter *sa, struct sfc_rxq *rxq)
 619 {
 620         boolean_t rss = (sa->rss_channels > 0) ? B_TRUE : B_FALSE;
 621         struct sfc_port *port = &sa->port;
 622         int rc;
 623
 624         /*
 625          * If promiscuous or all-multicast mode has been requested, setting
 626          * filter for the default Rx queue might fail, in particular, while
 627          * running over PCI function which is not a member of corresponding
 628          * privilege groups; if this occurs, few iterations will be made to
 629          * repeat this step without promiscuous and all-multicast flags set
 630          */
 631 retry:
 632         rc = efx_mac_filter_default_rxq_set(sa->nic, rxq->common, rss);
 633         if (rc == 0)
 634                 return 0;
 635         else if (rc != EOPNOTSUPP)
 636                 return rc;
 637
 638         if (port->promisc) {
 639                 sfc_warn(sa, "promiscuous mode has been requested, "
 640                              "but the HW rejects it");
 641                 sfc_warn(sa, "promiscuous mode will be disabled");
 642
 643                 port->promisc = B_FALSE;
 644                 rc = sfc_set_rx_mode(sa);
 645                 if (rc != 0)
 646                         return rc;
 647
 648                 goto retry;
 649         }
 650
 651         if (port->allmulti) {
 652                 sfc_warn(sa, "all-multicast mode has been requested, "
 653                              "but the HW rejects it");
 654                 sfc_warn(sa, "all-multicast mode will be disabled");
 655
 656                 port->allmulti = B_FALSE;
 657                 rc = sfc_set_rx_mode(sa);
 658                 if (rc != 0)
 659                         return rc;
 660
 661                 goto retry;
 662         }
 663
 664         return rc;
 665 }
 666
 667 int
 668 sfc_rx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
 669 {
 670         struct sfc_port *port = &sa->port;
 671         struct sfc_rxq_info *rxq_info;
 672         struct sfc_rxq *rxq;
 673         struct sfc_evq *evq;
 674         int rc;
 675
 676         sfc_log_init(sa, "sw_index=%u", sw_index);
 677
 678         SFC_ASSERT(sw_index < sa->rxq_count);
 679
 680         rxq_info = &sa->rxq_info[sw_index];
 681         rxq = rxq_info->rxq;
 682         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 683
 684         evq = rxq->evq;
 685
 686         rc = sfc_ev_qstart(evq, sfc_evq_index_by_rxq_sw_index(sa, sw_index));
 687         if (rc != 0)
 688                 goto fail_ev_qstart;
 689
 690         rc = efx_rx_qcreate(sa->nic, rxq->hw_index, 0, rxq_info->type,
 691                             &rxq->mem, rxq_info->entries,
 692                             0 /* not used on EF10 */, rxq_info->type_flags,
 693                             evq->common, &rxq->common);
 694         if (rc != 0)
 695                 goto fail_rx_qcreate;
 696
 697         efx_rx_qenable(rxq->common);
 698
 699         rc = sa->dp_rx->qstart(rxq->dp, evq->read_ptr);
 700         if (rc != 0)
 701                 goto fail_dp_qstart;
 702
 703         rxq->state |= SFC_RXQ_STARTED;
 704
 705         if ((sw_index == 0) && !port->isolated) {
 706                 rc = sfc_rx_default_rxq_set_filter(sa, rxq);
 707                 if (rc != 0)
 708                         goto fail_mac_filter_default_rxq_set;
 709         }
 710
 711         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 712         sa->eth_dev->data->rx_queue_state[sw_index] =
 713                 RTE_ETH_QUEUE_STATE_STARTED;
 714
 715         return 0;
 716
 717 fail_mac_filter_default_rxq_set:
 718         sa->dp_rx->qstop(rxq->dp, &rxq->evq->read_ptr);
 719
 720 fail_dp_qstart:
 721         sfc_rx_qflush(sa, sw_index);
 722
 723 fail_rx_qcreate:
 724         sfc_ev_qstop(evq);
 725
 726 fail_ev_qstart:
 727         return rc;
 728 }
 729
 730 void
 731 sfc_rx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
 732 {
 733         struct sfc_rxq_info *rxq_info;
 734         struct sfc_rxq *rxq;
 735
 736         sfc_log_init(sa, "sw_index=%u", sw_index);
 737
 738         SFC_ASSERT(sw_index < sa->rxq_count);
 739
 740         rxq_info = &sa->rxq_info[sw_index];
 741         rxq = rxq_info->rxq;
 742
 743         if (rxq->state == SFC_RXQ_INITIALIZED)
 744                 return;
 745         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 746
 747         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 748         sa->eth_dev->data->rx_queue_state[sw_index] =
 749                 RTE_ETH_QUEUE_STATE_STOPPED;
 750
 751         sa->dp_rx->qstop(rxq->dp, &rxq->evq->read_ptr);
 752
 753         if (sw_index == 0)
 754                 efx_mac_filter_default_rxq_clear(sa->nic);
 755
 756         sfc_rx_qflush(sa, sw_index);
 757
 758         rxq->state = SFC_RXQ_INITIALIZED;
 759
 760         efx_rx_qdestroy(rxq->common);
 761
 762         sfc_ev_qstop(rxq->evq);
 763 }
 764
 765 uint64_t
 766 sfc_rx_get_dev_offload_caps(struct sfc_adapter *sa)
 767 {
 768         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 769         uint64_t caps = 0;
 770
 771         caps |= DEV_RX_OFFLOAD_IPV4_CKSUM;
 772         caps |= DEV_RX_OFFLOAD_UDP_CKSUM;
 773         caps |= DEV_RX_OFFLOAD_TCP_CKSUM;
 774
 775         if (encp->enc_tunnel_encapsulations_supported &&
 776             (sa->dp_rx->features & SFC_DP_RX_FEAT_TUNNELS))
 777                 caps |= DEV_RX_OFFLOAD_OUTER_IPV4_CKSUM;
 778
 779         return caps;
 780 }
 781
 782 static int
 783 sfc_rx_qcheck_conf(struct sfc_adapter *sa, unsigned int rxq_max_fill_level,
 784                    const struct rte_eth_rxconf *rx_conf)
 785 {
 786         int rc = 0;
 787
 788         if (rx_conf->rx_thresh.pthresh != 0 ||
 789             rx_conf->rx_thresh.hthresh != 0 ||
 790             rx_conf->rx_thresh.wthresh != 0) {
 791                 sfc_warn(sa,
 792                         "RxQ prefetch/host/writeback thresholds are not supported");
 793         }
 794
 795         if (rx_conf->rx_free_thresh > rxq_max_fill_level) {
 796                 sfc_err(sa,
 797                         "RxQ free threshold too large: %u vs maximum %u",
 798                         rx_conf->rx_free_thresh, rxq_max_fill_level);
 799                 rc = EINVAL;
 800         }
 801
 802         if (rx_conf->rx_drop_en == 0) {
 803                 sfc_err(sa, "RxQ drop disable is not supported");
 804                 rc = EINVAL;
 805         }
 806
 807         return rc;
 808 }
 809
 810 static unsigned int
 811 sfc_rx_mbuf_data_alignment(struct rte_mempool *mb_pool)
 812 {
 813         uint32_t data_off;
 814         uint32_t order;
 815
 816         /* The mbuf object itself is always cache line aligned */
 817         order = rte_bsf32(RTE_CACHE_LINE_SIZE);
 818
 819         /* Data offset from mbuf object start */
 820         data_off = sizeof(struct rte_mbuf) + rte_pktmbuf_priv_size(mb_pool) +
 821                 RTE_PKTMBUF_HEADROOM;
 822
 823         order = MIN(order, rte_bsf32(data_off));
 824
 825         return 1u << (order - 1);
 826 }
 827
 828 static uint16_t
 829 sfc_rx_mb_pool_buf_size(struct sfc_adapter *sa, struct rte_mempool *mb_pool)
 830 {
 831         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 832         const uint32_t nic_align_start = MAX(1, encp->enc_rx_buf_align_start);
 833         const uint32_t nic_align_end = MAX(1, encp->enc_rx_buf_align_end);
 834         uint16_t buf_size;
 835         unsigned int buf_aligned;
 836         unsigned int start_alignment;
 837         unsigned int end_padding_alignment;
 838
 839         /* Below it is assumed that both alignments are power of 2 */
 840         SFC_ASSERT(rte_is_power_of_2(nic_align_start));
 841         SFC_ASSERT(rte_is_power_of_2(nic_align_end));
 842
 843         /*
 844          * mbuf is always cache line aligned, double-check
 845          * that it meets rx buffer start alignment requirements.
 846          */
 847
 848         /* Start from mbuf pool data room size */
 849         buf_size = rte_pktmbuf_data_room_size(mb_pool);
 850
 851         /* Remove headroom */
 852         if (buf_size <= RTE_PKTMBUF_HEADROOM) {
 853                 sfc_err(sa,
 854                         "RxQ mbuf pool %s object data room size %u is smaller than headroom %u",
 855                         mb_pool->name, buf_size, RTE_PKTMBUF_HEADROOM);
 856                 return 0;
 857         }
 858         buf_size -= RTE_PKTMBUF_HEADROOM;
 859
 860         /* Calculate guaranteed data start alignment */
 861         buf_aligned = sfc_rx_mbuf_data_alignment(mb_pool);
 862
 863         /* Reserve space for start alignment */
 864         if (buf_aligned < nic_align_start) {
 865                 start_alignment = nic_align_start - buf_aligned;
 866                 if (buf_size <= start_alignment) {
 867                         sfc_err(sa,
 868                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u and buffer start alignment %u required by NIC",
 869                                 mb_pool->name,
 870                                 rte_pktmbuf_data_room_size(mb_pool),
 871                                 RTE_PKTMBUF_HEADROOM, start_alignment);
 872                         return 0;
 873                 }
 874                 buf_aligned = nic_align_start;
 875                 buf_size -= start_alignment;
 876         } else {
 877                 start_alignment = 0;
 878         }
 879
 880         /* Make sure that end padding does not write beyond the buffer */
 881         if (buf_aligned < nic_align_end) {
 882                 /*
 883                  * Estimate space which can be lost. If guarnteed buffer
 884                  * size is odd, lost space is (nic_align_end - 1). More
 885                  * accurate formula is below.
 886                  */
 887                 end_padding_alignment = nic_align_end -
 888                         MIN(buf_aligned, 1u << (rte_bsf32(buf_size) - 1));
 889                 if (buf_size <= end_padding_alignment) {
 890                         sfc_err(sa,
 891                                 "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",
 892                                 mb_pool->name,
 893                                 rte_pktmbuf_data_room_size(mb_pool),
 894                                 RTE_PKTMBUF_HEADROOM, start_alignment,
 895                                 end_padding_alignment);
 896                         return 0;
 897                 }
 898                 buf_size -= end_padding_alignment;
 899         } else {
 900                 /*
 901                  * Start is aligned the same or better than end,
 902                  * just align length.
 903                  */
 904                 buf_size = P2ALIGN(buf_size, nic_align_end);
 905         }
 906
 907         return buf_size;
 908 }
 909
 910 int
 911 sfc_rx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
 912              uint16_t nb_rx_desc, unsigned int socket_id,
 913              const struct rte_eth_rxconf *rx_conf,
 914              struct rte_mempool *mb_pool)
 915 {
 916         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 917         int rc;
 918         unsigned int rxq_entries;
 919         unsigned int evq_entries;
 920         unsigned int rxq_max_fill_level;
 921         uint16_t buf_size;
 922         struct sfc_rxq_info *rxq_info;
 923         struct sfc_evq *evq;
 924         struct sfc_rxq *rxq;
 925         struct sfc_dp_rx_qcreate_info info;
 926
 927         rc = sa->dp_rx->qsize_up_rings(nb_rx_desc, &rxq_entries, &evq_entries,
 928                                        &rxq_max_fill_level);
 929         if (rc != 0)
 930                 goto fail_size_up_rings;
 931         SFC_ASSERT(rxq_entries >= EFX_RXQ_MINNDESCS);
 932         SFC_ASSERT(rxq_entries <= EFX_RXQ_MAXNDESCS);
 933         SFC_ASSERT(rxq_entries >= nb_rx_desc);
 934         SFC_ASSERT(rxq_max_fill_level <= nb_rx_desc);
 935
 936         rc = sfc_rx_qcheck_conf(sa, rxq_max_fill_level, rx_conf);
 937         if (rc != 0)
 938                 goto fail_bad_conf;
 939
 940         buf_size = sfc_rx_mb_pool_buf_size(sa, mb_pool);
 941         if (buf_size == 0) {
 942                 sfc_err(sa, "RxQ %u mbuf pool object size is too small",
 943                         sw_index);
 944                 rc = EINVAL;
 945                 goto fail_bad_conf;
 946         }
 947
 948         if ((buf_size < sa->port.pdu + encp->enc_rx_prefix_size) &&
 949             !sa->eth_dev->data->dev_conf.rxmode.enable_scatter) {
 950                 sfc_err(sa, "Rx scatter is disabled and RxQ %u mbuf pool "
 951                         "object size is too small", sw_index);
 952                 sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
 953                         "PDU size %u plus Rx prefix %u bytes",
 954                         sw_index, buf_size, (unsigned int)sa->port.pdu,
 955                         encp->enc_rx_prefix_size);
 956                 rc = EINVAL;
 957                 goto fail_bad_conf;
 958         }
 959
 960         SFC_ASSERT(sw_index < sa->rxq_count);
 961         rxq_info = &sa->rxq_info[sw_index];
 962
 963         SFC_ASSERT(rxq_entries <= rxq_info->max_entries);
 964         rxq_info->entries = rxq_entries;
 965         rxq_info->type = EFX_RXQ_TYPE_DEFAULT;
 966         rxq_info->type_flags =
 967                 sa->eth_dev->data->dev_conf.rxmode.enable_scatter ?
 968                 EFX_RXQ_FLAG_SCATTER : EFX_RXQ_FLAG_NONE;
 969
 970         if ((encp->enc_tunnel_encapsulations_supported != 0) &&
 971             (sa->dp_rx->features & SFC_DP_RX_FEAT_TUNNELS))
 972                 rxq_info->type_flags |= EFX_RXQ_FLAG_INNER_CLASSES;
 973
 974         rc = sfc_ev_qinit(sa, SFC_EVQ_TYPE_RX, sw_index,
 975                           evq_entries, socket_id, &evq);
 976         if (rc != 0)
 977                 goto fail_ev_qinit;
 978
 979         rc = ENOMEM;
 980         rxq = rte_zmalloc_socket("sfc-rxq", sizeof(*rxq), RTE_CACHE_LINE_SIZE,
 981                                  socket_id);
 982         if (rxq == NULL)
 983                 goto fail_rxq_alloc;
 984
 985         rxq_info->rxq = rxq;
 986
 987         rxq->evq = evq;
 988         rxq->hw_index = sw_index;
 989         rxq->refill_threshold =
 990                 RTE_MAX(rx_conf->rx_free_thresh, SFC_RX_REFILL_BULK);
 991         rxq->refill_mb_pool = mb_pool;
 992
 993         rc = sfc_dma_alloc(sa, "rxq", sw_index, EFX_RXQ_SIZE(rxq_info->entries),
 994                            socket_id, &rxq->mem);
 995         if (rc != 0)
 996                 goto fail_dma_alloc;
 997
 998         memset(&info, 0, sizeof(info));
 999         info.refill_mb_pool = rxq->refill_mb_pool;
1000         info.max_fill_level = rxq_max_fill_level;
1001         info.refill_threshold = rxq->refill_threshold;
1002         info.buf_size = buf_size;
1003         info.batch_max = encp->enc_rx_batch_max;
1004         info.prefix_size = encp->enc_rx_prefix_size;
1005
1006 #if EFSYS_OPT_RX_SCALE
1007         if (sa->hash_support == EFX_RX_HASH_AVAILABLE && sa->rss_channels > 0)
1008                 info.flags |= SFC_RXQ_FLAG_RSS_HASH;
1009 #endif
1010
1011         info.rxq_entries = rxq_info->entries;
1012         info.rxq_hw_ring = rxq->mem.esm_base;
1013         info.evq_entries = evq_entries;
1014         info.evq_hw_ring = evq->mem.esm_base;
1015         info.hw_index = rxq->hw_index;
1016         info.mem_bar = sa->mem_bar.esb_base;
1017
1018         rc = sa->dp_rx->qcreate(sa->eth_dev->data->port_id, sw_index,
1019                                 &RTE_ETH_DEV_TO_PCI(sa->eth_dev)->addr,
1020                                 socket_id, &info, &rxq->dp);
1021         if (rc != 0)
1022                 goto fail_dp_rx_qcreate;
1023
1024         evq->dp_rxq = rxq->dp;
1025
1026         rxq->state = SFC_RXQ_INITIALIZED;
1027
1028         rxq_info->deferred_start = (rx_conf->rx_deferred_start != 0);
1029
1030         return 0;
1031
1032 fail_dp_rx_qcreate:
1033         sfc_dma_free(sa, &rxq->mem);
1034
1035 fail_dma_alloc:
1036         rxq_info->rxq = NULL;
1037         rte_free(rxq);
1038
1039 fail_rxq_alloc:
1040         sfc_ev_qfini(evq);
1041
1042 fail_ev_qinit:
1043         rxq_info->entries = 0;
1044
1045 fail_bad_conf:
1046 fail_size_up_rings:
1047         sfc_log_init(sa, "failed %d", rc);
1048         return rc;
1049 }
1050
1051 void
1052 sfc_rx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
1053 {
1054         struct sfc_rxq_info *rxq_info;
1055         struct sfc_rxq *rxq;
1056
1057         SFC_ASSERT(sw_index < sa->rxq_count);
1058
1059         rxq_info = &sa->rxq_info[sw_index];
1060
1061         rxq = rxq_info->rxq;
1062         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
1063
1064         sa->dp_rx->qdestroy(rxq->dp);
1065         rxq->dp = NULL;
1066
1067         rxq_info->rxq = NULL;
1068         rxq_info->entries = 0;
1069
1070         sfc_dma_free(sa, &rxq->mem);
1071
1072         sfc_ev_qfini(rxq->evq);
1073         rxq->evq = NULL;
1074
1075         rte_free(rxq);
1076 }
1077
1078 #if EFSYS_OPT_RX_SCALE
1079 efx_rx_hash_type_t
1080 sfc_rte_to_efx_hash_type(uint64_t rss_hf)
1081 {
1082         efx_rx_hash_type_t efx_hash_types = 0;
1083
1084         if ((rss_hf & (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
1085                        ETH_RSS_NONFRAG_IPV4_OTHER)) != 0)
1086                 efx_hash_types |= EFX_RX_HASH_IPV4;
1087
1088         if ((rss_hf & ETH_RSS_NONFRAG_IPV4_TCP) != 0)
1089                 efx_hash_types |= EFX_RX_HASH_TCPIPV4;
1090
1091         if ((rss_hf & (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
1092                         ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX)) != 0)
1093                 efx_hash_types |= EFX_RX_HASH_IPV6;
1094
1095         if ((rss_hf & (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX)) != 0)
1096                 efx_hash_types |= EFX_RX_HASH_TCPIPV6;
1097
1098         return efx_hash_types;
1099 }
1100
1101 uint64_t
1102 sfc_efx_to_rte_hash_type(efx_rx_hash_type_t efx_hash_types)
1103 {
1104         uint64_t rss_hf = 0;
1105
1106         if ((efx_hash_types & EFX_RX_HASH_IPV4) != 0)
1107                 rss_hf |= (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
1108                            ETH_RSS_NONFRAG_IPV4_OTHER);
1109
1110         if ((efx_hash_types & EFX_RX_HASH_TCPIPV4) != 0)
1111                 rss_hf |= ETH_RSS_NONFRAG_IPV4_TCP;
1112
1113         if ((efx_hash_types & EFX_RX_HASH_IPV6) != 0)
1114                 rss_hf |= (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
1115                            ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX);
1116
1117         if ((efx_hash_types & EFX_RX_HASH_TCPIPV6) != 0)
1118                 rss_hf |= (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX);
1119
1120         return rss_hf;
1121 }
1122 #endif
1123
1124 #if EFSYS_OPT_RX_SCALE
1125 static int
1126 sfc_rx_rss_config(struct sfc_adapter *sa)
1127 {
1128         int rc = 0;
1129
1130         if (sa->rss_channels > 0) {
1131                 rc = efx_rx_scale_mode_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1132                                            EFX_RX_HASHALG_TOEPLITZ,
1133                                            sa->rss_hash_types, B_TRUE);
1134                 if (rc != 0)
1135                         goto finish;
1136
1137                 rc = efx_rx_scale_key_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1138                                           sa->rss_key,
1139                                           sizeof(sa->rss_key));
1140                 if (rc != 0)
1141                         goto finish;
1142
1143                 rc = efx_rx_scale_tbl_set(sa->nic, EFX_RSS_CONTEXT_DEFAULT,
1144                                           sa->rss_tbl, RTE_DIM(sa->rss_tbl));
1145         }
1146
1147 finish:
1148         return rc;
1149 }
1150 #else
1151 static int
1152 sfc_rx_rss_config(__rte_unused struct sfc_adapter *sa)
1153 {
1154         return 0;
1155 }
1156 #endif
1157
1158 int
1159 sfc_rx_start(struct sfc_adapter *sa)
1160 {
1161         unsigned int sw_index;
1162         int rc;
1163
1164         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
1165
1166         rc = efx_rx_init(sa->nic);
1167         if (rc != 0)
1168                 goto fail_rx_init;
1169
1170         rc = sfc_rx_rss_config(sa);
1171         if (rc != 0)
1172                 goto fail_rss_config;
1173
1174         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
1175                 if ((!sa->rxq_info[sw_index].deferred_start ||
1176                      sa->rxq_info[sw_index].deferred_started)) {
1177                         rc = sfc_rx_qstart(sa, sw_index);
1178                         if (rc != 0)
1179                                 goto fail_rx_qstart;
1180                 }
1181         }
1182
1183         return 0;
1184
1185 fail_rx_qstart:
1186         while (sw_index-- > 0)
1187                 sfc_rx_qstop(sa, sw_index);
1188
1189 fail_rss_config:
1190         efx_rx_fini(sa->nic);
1191
1192 fail_rx_init:
1193         sfc_log_init(sa, "failed %d", rc);
1194         return rc;
1195 }
1196
1197 void
1198 sfc_rx_stop(struct sfc_adapter *sa)
1199 {
1200         unsigned int sw_index;
1201
1202         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
1203
1204         sw_index = sa->rxq_count;
1205         while (sw_index-- > 0) {
1206                 if (sa->rxq_info[sw_index].rxq != NULL)
1207                         sfc_rx_qstop(sa, sw_index);
1208         }
1209
1210         efx_rx_fini(sa->nic);
1211 }
1212
1213 static int
1214 sfc_rx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
1215 {
1216         struct sfc_rxq_info *rxq_info = &sa->rxq_info[sw_index];
1217         unsigned int max_entries;
1218
1219         max_entries = EFX_RXQ_MAXNDESCS;
1220         SFC_ASSERT(rte_is_power_of_2(max_entries));
1221
1222         rxq_info->max_entries = max_entries;
1223
1224         return 0;
1225 }
1226
1227 static int
1228 sfc_rx_check_mode(struct sfc_adapter *sa, struct rte_eth_rxmode *rxmode)
1229 {
1230         int rc = 0;
1231
1232         switch (rxmode->mq_mode) {
1233         case ETH_MQ_RX_NONE:
1234                 /* No special checks are required */
1235                 break;
1236 #if EFSYS_OPT_RX_SCALE
1237         case ETH_MQ_RX_RSS:
1238                 if (sa->rss_support == EFX_RX_SCALE_UNAVAILABLE) {
1239                         sfc_err(sa, "RSS is not available");
1240                         rc = EINVAL;
1241                 }
1242                 break;
1243 #endif
1244         default:
1245                 sfc_err(sa, "Rx multi-queue mode %u not supported",
1246                         rxmode->mq_mode);
1247                 rc = EINVAL;
1248         }
1249
1250         if (rxmode->header_split) {
1251                 sfc_err(sa, "Header split on Rx not supported");
1252                 rc = EINVAL;
1253         }
1254
1255         if (rxmode->hw_vlan_filter) {
1256                 sfc_err(sa, "HW VLAN filtering not supported");
1257                 rc = EINVAL;
1258         }
1259
1260         if (rxmode->hw_vlan_strip) {
1261                 sfc_err(sa, "HW VLAN stripping not supported");
1262                 rc = EINVAL;
1263         }
1264
1265         if (rxmode->hw_vlan_extend) {
1266                 sfc_err(sa,
1267                         "Q-in-Q HW VLAN stripping not supported");
1268                 rc = EINVAL;
1269         }
1270
1271         if (!rxmode->hw_strip_crc) {
1272                 sfc_warn(sa,
1273                          "FCS stripping control not supported - always stripped");
1274                 rxmode->hw_strip_crc = 1;
1275         }
1276
1277         if (rxmode->enable_scatter &&
1278             (~sa->dp_rx->features & SFC_DP_RX_FEAT_SCATTER)) {
1279                 sfc_err(sa, "Rx scatter not supported by %s datapath",
1280                         sa->dp_rx->dp.name);
1281                 rc = EINVAL;
1282         }
1283
1284         if (rxmode->enable_lro) {
1285                 sfc_err(sa, "LRO not supported");
1286                 rc = EINVAL;
1287         }
1288
1289         return rc;
1290 }
1291
1292 /**
1293  * Destroy excess queues that are no longer needed after reconfiguration
1294  * or complete close.
1295  */
1296 static void
1297 sfc_rx_fini_queues(struct sfc_adapter *sa, unsigned int nb_rx_queues)
1298 {
1299         int sw_index;
1300
1301         SFC_ASSERT(nb_rx_queues <= sa->rxq_count);
1302
1303         sw_index = sa->rxq_count;
1304         while (--sw_index >= (int)nb_rx_queues) {
1305                 if (sa->rxq_info[sw_index].rxq != NULL)
1306                         sfc_rx_qfini(sa, sw_index);
1307         }
1308
1309         sa->rxq_count = nb_rx_queues;
1310 }
1311
1312 /**
1313  * Initialize Rx subsystem.
1314  *
1315  * Called at device (re)configuration stage when number of receive queues is
1316  * specified together with other device level receive configuration.
1317  *
1318  * It should be used to allocate NUMA-unaware resources.
1319  */
1320 int
1321 sfc_rx_configure(struct sfc_adapter *sa)
1322 {
1323         struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
1324         const unsigned int nb_rx_queues = sa->eth_dev->data->nb_rx_queues;
1325         int rc;
1326
1327         sfc_log_init(sa, "nb_rx_queues=%u (old %u)",
1328                      nb_rx_queues, sa->rxq_count);
1329
1330         rc = sfc_rx_check_mode(sa, &dev_conf->rxmode);
1331         if (rc != 0)
1332                 goto fail_check_mode;
1333
1334         if (nb_rx_queues == sa->rxq_count)
1335                 goto done;
1336
1337         if (sa->rxq_info == NULL) {
1338                 rc = ENOMEM;
1339                 sa->rxq_info = rte_calloc_socket("sfc-rxqs", nb_rx_queues,
1340                                                  sizeof(sa->rxq_info[0]), 0,
1341                                                  sa->socket_id);
1342                 if (sa->rxq_info == NULL)
1343                         goto fail_rxqs_alloc;
1344         } else {
1345                 struct sfc_rxq_info *new_rxq_info;
1346
1347                 if (nb_rx_queues < sa->rxq_count)
1348                         sfc_rx_fini_queues(sa, nb_rx_queues);
1349
1350                 rc = ENOMEM;
1351                 new_rxq_info =
1352                         rte_realloc(sa->rxq_info,
1353                                     nb_rx_queues * sizeof(sa->rxq_info[0]), 0);
1354                 if (new_rxq_info == NULL && nb_rx_queues > 0)
1355                         goto fail_rxqs_realloc;
1356
1357                 sa->rxq_info = new_rxq_info;
1358                 if (nb_rx_queues > sa->rxq_count)
1359                         memset(&sa->rxq_info[sa->rxq_count], 0,
1360                                (nb_rx_queues - sa->rxq_count) *
1361                                sizeof(sa->rxq_info[0]));
1362         }
1363
1364         while (sa->rxq_count < nb_rx_queues) {
1365                 rc = sfc_rx_qinit_info(sa, sa->rxq_count);
1366                 if (rc != 0)
1367                         goto fail_rx_qinit_info;
1368
1369                 sa->rxq_count++;
1370         }
1371
1372 #if EFSYS_OPT_RX_SCALE
1373         sa->rss_channels = (dev_conf->rxmode.mq_mode == ETH_MQ_RX_RSS) ?
1374                            MIN(sa->rxq_count, EFX_MAXRSS) : 0;
1375
1376         if (sa->rss_channels > 0) {
1377                 unsigned int sw_index;
1378
1379                 for (sw_index = 0; sw_index < EFX_RSS_TBL_SIZE; ++sw_index)
1380                         sa->rss_tbl[sw_index] = sw_index % sa->rss_channels;
1381         }
1382 #endif
1383
1384 done:
1385         return 0;
1386
1387 fail_rx_qinit_info:
1388 fail_rxqs_realloc:
1389 fail_rxqs_alloc:
1390         sfc_rx_close(sa);
1391
1392 fail_check_mode:
1393         sfc_log_init(sa, "failed %d", rc);
1394         return rc;
1395 }
1396
1397 /**
1398  * Shutdown Rx subsystem.
1399  *
1400  * Called at device close stage, for example, before device shutdown.
1401  */
1402 void
1403 sfc_rx_close(struct sfc_adapter *sa)
1404 {
1405         sfc_rx_fini_queues(sa, 0);
1406
1407         sa->rss_channels = 0;
1408
1409         rte_free(sa->rxq_info);
1410         sa->rxq_info = NULL;
1411 }