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