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