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