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_tweak.h"
  42
  43 /*
  44  * Maximum number of Rx queue flush attempt in the case of failure or
  45  * flush timeout
  46  */
  47 #define SFC_RX_QFLUSH_ATTEMPTS          (3)
  48
  49 /*
  50  * Time to wait between event queue polling attempts when waiting for Rx
  51  * queue flush done or failed events.
  52  */
  53 #define SFC_RX_QFLUSH_POLL_WAIT_MS      (1)
  54
  55 /*
  56  * Maximum number of event queue polling attempts when waiting for Rx queue
  57  * flush done or failed events. It defines Rx queue flush attempt timeout
  58  * together with SFC_RX_QFLUSH_POLL_WAIT_MS.
  59  */
  60 #define SFC_RX_QFLUSH_POLL_ATTEMPTS     (2000)
  61
  62 void
  63 sfc_rx_qflush_done(struct sfc_rxq *rxq)
  64 {
  65         rxq->state |= SFC_RXQ_FLUSHED;
  66         rxq->state &= ~SFC_RXQ_FLUSHING;
  67 }
  68
  69 void
  70 sfc_rx_qflush_failed(struct sfc_rxq *rxq)
  71 {
  72         rxq->state |= SFC_RXQ_FLUSH_FAILED;
  73         rxq->state &= ~SFC_RXQ_FLUSHING;
  74 }
  75
  76 static void
  77 sfc_rx_qrefill(struct sfc_rxq *rxq)
  78 {
  79         unsigned int free_space;
  80         unsigned int bulks;
  81         void *objs[SFC_RX_REFILL_BULK];
  82         efsys_dma_addr_t addr[RTE_DIM(objs)];
  83         unsigned int added = rxq->added;
  84         unsigned int id;
  85         unsigned int i;
  86         struct sfc_rx_sw_desc *rxd;
  87         struct rte_mbuf *m;
  88         uint8_t port_id = rxq->port_id;
  89
  90         free_space = EFX_RXQ_LIMIT(rxq->ptr_mask + 1) -
  91                 (added - rxq->completed);
  92
  93         if (free_space < rxq->refill_threshold)
  94                 return;
  95
  96         bulks = free_space / RTE_DIM(objs);
  97
  98         id = added & rxq->ptr_mask;
  99         while (bulks-- > 0) {
 100                 if (rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
 101                                          RTE_DIM(objs)) < 0) {
 102                         /*
 103                          * It is hardly a safe way to increment counter
 104                          * from different contexts, but all PMDs do it.
 105                          */
 106                         rxq->evq->sa->eth_dev->data->rx_mbuf_alloc_failed +=
 107                                 RTE_DIM(objs);
 108                         break;
 109                 }
 110
 111                 for (i = 0; i < RTE_DIM(objs);
 112                      ++i, id = (id + 1) & rxq->ptr_mask) {
 113                         m = objs[i];
 114
 115                         rxd = &rxq->sw_desc[id];
 116                         rxd->mbuf = m;
 117
 118                         rte_mbuf_refcnt_set(m, 1);
 119                         m->data_off = RTE_PKTMBUF_HEADROOM;
 120                         m->next = NULL;
 121                         m->nb_segs = 1;
 122                         m->port = port_id;
 123
 124                         addr[i] = rte_pktmbuf_mtophys(m);
 125                 }
 126
 127                 efx_rx_qpost(rxq->common, addr, rxq->buf_size,
 128                              RTE_DIM(objs), rxq->completed, added);
 129                 added += RTE_DIM(objs);
 130         }
 131
 132         /* Push doorbell if something is posted */
 133         if (rxq->added != added) {
 134                 rxq->added = added;
 135                 efx_rx_qpush(rxq->common, added, &rxq->pushed);
 136         }
 137 }
 138
 139 static uint64_t
 140 sfc_rx_desc_flags_to_offload_flags(const unsigned int desc_flags)
 141 {
 142         uint64_t mbuf_flags = 0;
 143
 144         switch (desc_flags & (EFX_PKT_IPV4 | EFX_CKSUM_IPV4)) {
 145         case (EFX_PKT_IPV4 | EFX_CKSUM_IPV4):
 146                 mbuf_flags |= PKT_RX_IP_CKSUM_GOOD;
 147                 break;
 148         case EFX_PKT_IPV4:
 149                 mbuf_flags |= PKT_RX_IP_CKSUM_BAD;
 150                 break;
 151         default:
 152                 RTE_BUILD_BUG_ON(PKT_RX_IP_CKSUM_UNKNOWN != 0);
 153                 SFC_ASSERT((mbuf_flags & PKT_RX_IP_CKSUM_MASK) ==
 154                            PKT_RX_IP_CKSUM_UNKNOWN);
 155                 break;
 156         }
 157
 158         switch ((desc_flags &
 159                  (EFX_PKT_TCP | EFX_PKT_UDP | EFX_CKSUM_TCPUDP))) {
 160         case (EFX_PKT_TCP | EFX_CKSUM_TCPUDP):
 161         case (EFX_PKT_UDP | EFX_CKSUM_TCPUDP):
 162                 mbuf_flags |= PKT_RX_L4_CKSUM_GOOD;
 163                 break;
 164         case EFX_PKT_TCP:
 165         case EFX_PKT_UDP:
 166                 mbuf_flags |= PKT_RX_L4_CKSUM_BAD;
 167                 break;
 168         default:
 169                 RTE_BUILD_BUG_ON(PKT_RX_L4_CKSUM_UNKNOWN != 0);
 170                 SFC_ASSERT((mbuf_flags & PKT_RX_L4_CKSUM_MASK) ==
 171                            PKT_RX_L4_CKSUM_UNKNOWN);
 172                 break;
 173         }
 174
 175         return mbuf_flags;
 176 }
 177
 178 static uint32_t
 179 sfc_rx_desc_flags_to_packet_type(const unsigned int desc_flags)
 180 {
 181         return RTE_PTYPE_L2_ETHER |
 182                 ((desc_flags & EFX_PKT_IPV4) ?
 183                         RTE_PTYPE_L3_IPV4_EXT_UNKNOWN : 0) |
 184                 ((desc_flags & EFX_PKT_IPV6) ?
 185                         RTE_PTYPE_L3_IPV6_EXT_UNKNOWN : 0) |
 186                 ((desc_flags & EFX_PKT_TCP) ? RTE_PTYPE_L4_TCP : 0) |
 187                 ((desc_flags & EFX_PKT_UDP) ? RTE_PTYPE_L4_UDP : 0);
 188 }
 189
 190 static void
 191 sfc_rx_set_rss_hash(struct sfc_rxq *rxq, unsigned int flags, struct rte_mbuf *m)
 192 {
 193 #if EFSYS_OPT_RX_SCALE
 194         uint8_t *mbuf_data;
 195
 196
 197         if ((rxq->flags & SFC_RXQ_FLAG_RSS_HASH) == 0)
 198                 return;
 199
 200         mbuf_data = rte_pktmbuf_mtod(m, uint8_t *);
 201
 202         if (flags & (EFX_PKT_IPV4 | EFX_PKT_IPV6)) {
 203                 m->hash.rss = efx_pseudo_hdr_hash_get(rxq->common,
 204                                                       EFX_RX_HASHALG_TOEPLITZ,
 205                                                       mbuf_data);
 206
 207                 m->ol_flags |= PKT_RX_RSS_HASH;
 208         }
 209 #endif
 210 }
 211
 212 uint16_t
 213 sfc_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 214 {
 215         struct sfc_rxq *rxq = rx_queue;
 216         unsigned int completed;
 217         unsigned int prefix_size = rxq->prefix_size;
 218         unsigned int done_pkts = 0;
 219         boolean_t discard_next = B_FALSE;
 220         struct rte_mbuf *scatter_pkt = NULL;
 221
 222         if (unlikely((rxq->state & SFC_RXQ_RUNNING) == 0))
 223                 return 0;
 224
 225         sfc_ev_qpoll(rxq->evq);
 226
 227         completed = rxq->completed;
 228         while (completed != rxq->pending && done_pkts < nb_pkts) {
 229                 unsigned int id;
 230                 struct sfc_rx_sw_desc *rxd;
 231                 struct rte_mbuf *m;
 232                 unsigned int seg_len;
 233                 unsigned int desc_flags;
 234
 235                 id = completed++ & rxq->ptr_mask;
 236                 rxd = &rxq->sw_desc[id];
 237                 m = rxd->mbuf;
 238                 desc_flags = rxd->flags;
 239
 240                 if (discard_next)
 241                         goto discard;
 242
 243                 if (desc_flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))
 244                         goto discard;
 245
 246                 if (desc_flags & EFX_PKT_PREFIX_LEN) {
 247                         uint16_t tmp_size;
 248                         int rc __rte_unused;
 249
 250                         rc = efx_pseudo_hdr_pkt_length_get(rxq->common,
 251                                 rte_pktmbuf_mtod(m, uint8_t *), &tmp_size);
 252                         SFC_ASSERT(rc == 0);
 253                         seg_len = tmp_size;
 254                 } else {
 255                         seg_len = rxd->size - prefix_size;
 256                 }
 257
 258                 rte_pktmbuf_data_len(m) = seg_len;
 259                 rte_pktmbuf_pkt_len(m) = seg_len;
 260
 261                 if (scatter_pkt != NULL) {
 262                         if (rte_pktmbuf_chain(scatter_pkt, m) != 0) {
 263                                 rte_mempool_put(rxq->refill_mb_pool,
 264                                                 scatter_pkt);
 265                                 goto discard;
 266                         }
 267                         /* The packet to deliver */
 268                         m = scatter_pkt;
 269                 }
 270
 271                 if (desc_flags & EFX_PKT_CONT) {
 272                         /* The packet is scattered, more fragments to come */
 273                         scatter_pkt = m;
 274                         /* Futher fragments have no prefix */
 275                         prefix_size = 0;
 276                         continue;
 277                 }
 278
 279                 /* Scattered packet is done */
 280                 scatter_pkt = NULL;
 281                 /* The first fragment of the packet has prefix */
 282                 prefix_size = rxq->prefix_size;
 283
 284                 m->ol_flags = sfc_rx_desc_flags_to_offload_flags(desc_flags);
 285                 m->packet_type = sfc_rx_desc_flags_to_packet_type(desc_flags);
 286
 287                 /*
 288                  * Extract RSS hash from the packet prefix and
 289                  * set the corresponding field (if needed and possible)
 290                  */
 291                 sfc_rx_set_rss_hash(rxq, desc_flags, m);
 292
 293                 m->data_off += prefix_size;
 294
 295                 *rx_pkts++ = m;
 296                 done_pkts++;
 297                 continue;
 298
 299 discard:
 300                 discard_next = ((desc_flags & EFX_PKT_CONT) != 0);
 301                 rte_mempool_put(rxq->refill_mb_pool, m);
 302                 rxd->mbuf = NULL;
 303         }
 304
 305         /* pending is only moved when entire packet is received */
 306         SFC_ASSERT(scatter_pkt == NULL);
 307
 308         rxq->completed = completed;
 309
 310         sfc_rx_qrefill(rxq);
 311
 312         return done_pkts;
 313 }
 314
 315 unsigned int
 316 sfc_rx_qdesc_npending(struct sfc_adapter *sa, unsigned int sw_index)
 317 {
 318         struct sfc_rxq *rxq;
 319
 320         SFC_ASSERT(sw_index < sa->rxq_count);
 321         rxq = sa->rxq_info[sw_index].rxq;
 322
 323         if (rxq == NULL || (rxq->state & SFC_RXQ_RUNNING) == 0)
 324                 return 0;
 325
 326         sfc_ev_qpoll(rxq->evq);
 327
 328         return rxq->pending - rxq->completed;
 329 }
 330
 331 int
 332 sfc_rx_qdesc_done(struct sfc_rxq *rxq, unsigned int offset)
 333 {
 334         if ((rxq->state & SFC_RXQ_RUNNING) == 0)
 335                 return 0;
 336
 337         sfc_ev_qpoll(rxq->evq);
 338
 339         return offset < (rxq->pending - rxq->completed);
 340 }
 341
 342 static void
 343 sfc_rx_qpurge(struct sfc_rxq *rxq)
 344 {
 345         unsigned int i;
 346         struct sfc_rx_sw_desc *rxd;
 347
 348         for (i = rxq->completed; i != rxq->added; ++i) {
 349                 rxd = &rxq->sw_desc[i & rxq->ptr_mask];
 350                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
 351                 rxd->mbuf = NULL;
 352         }
 353 }
 354
 355 static void
 356 sfc_rx_qflush(struct sfc_adapter *sa, unsigned int sw_index)
 357 {
 358         struct sfc_rxq *rxq;
 359         unsigned int retry_count;
 360         unsigned int wait_count;
 361
 362         rxq = sa->rxq_info[sw_index].rxq;
 363         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 364
 365         /*
 366          * Retry Rx queue flushing in the case of flush failed or
 367          * timeout. In the worst case it can delay for 6 seconds.
 368          */
 369         for (retry_count = 0;
 370              ((rxq->state & SFC_RXQ_FLUSHED) == 0) &&
 371              (retry_count < SFC_RX_QFLUSH_ATTEMPTS);
 372              ++retry_count) {
 373                 if (efx_rx_qflush(rxq->common) != 0) {
 374                         rxq->state |= SFC_RXQ_FLUSH_FAILED;
 375                         break;
 376                 }
 377                 rxq->state &= ~SFC_RXQ_FLUSH_FAILED;
 378                 rxq->state |= SFC_RXQ_FLUSHING;
 379
 380                 /*
 381                  * Wait for Rx queue flush done or failed event at least
 382                  * SFC_RX_QFLUSH_POLL_WAIT_MS milliseconds and not more
 383                  * than 2 seconds (SFC_RX_QFLUSH_POLL_WAIT_MS multiplied
 384                  * by SFC_RX_QFLUSH_POLL_ATTEMPTS).
 385                  */
 386                 wait_count = 0;
 387                 do {
 388                         rte_delay_ms(SFC_RX_QFLUSH_POLL_WAIT_MS);
 389                         sfc_ev_qpoll(rxq->evq);
 390                 } while ((rxq->state & SFC_RXQ_FLUSHING) &&
 391                          (wait_count++ < SFC_RX_QFLUSH_POLL_ATTEMPTS));
 392
 393                 if (rxq->state & SFC_RXQ_FLUSHING)
 394                         sfc_err(sa, "RxQ %u flush timed out", sw_index);
 395
 396                 if (rxq->state & SFC_RXQ_FLUSH_FAILED)
 397                         sfc_err(sa, "RxQ %u flush failed", sw_index);
 398
 399                 if (rxq->state & SFC_RXQ_FLUSHED)
 400                         sfc_info(sa, "RxQ %u flushed", sw_index);
 401         }
 402
 403         sfc_rx_qpurge(rxq);
 404 }
 405
 406 static int
 407 sfc_rx_default_rxq_set_filter(struct sfc_adapter *sa, struct sfc_rxq *rxq)
 408 {
 409         boolean_t rss = (sa->rss_channels > 1) ? B_TRUE : B_FALSE;
 410         struct sfc_port *port = &sa->port;
 411         int rc;
 412
 413         /*
 414          * If promiscuous or all-multicast mode has been requested, setting
 415          * filter for the default Rx queue might fail, in particular, while
 416          * running over PCI function which is not a member of corresponding
 417          * privilege groups; if this occurs, few iterations will be made to
 418          * repeat this step without promiscuous and all-multicast flags set
 419          */
 420 retry:
 421         rc = efx_mac_filter_default_rxq_set(sa->nic, rxq->common, rss);
 422         if (rc == 0)
 423                 return 0;
 424         else if (rc != EOPNOTSUPP)
 425                 return rc;
 426
 427         if (port->promisc) {
 428                 sfc_warn(sa, "promiscuous mode has been requested, "
 429                              "but the HW rejects it");
 430                 sfc_warn(sa, "promiscuous mode will be disabled");
 431
 432                 port->promisc = B_FALSE;
 433                 rc = sfc_set_rx_mode(sa);
 434                 if (rc != 0)
 435                         return rc;
 436
 437                 goto retry;
 438         }
 439
 440         if (port->allmulti) {
 441                 sfc_warn(sa, "all-multicast mode has been requested, "
 442                              "but the HW rejects it");
 443                 sfc_warn(sa, "all-multicast mode will be disabled");
 444
 445                 port->allmulti = B_FALSE;
 446                 rc = sfc_set_rx_mode(sa);
 447                 if (rc != 0)
 448                         return rc;
 449
 450                 goto retry;
 451         }
 452
 453         return rc;
 454 }
 455
 456 int
 457 sfc_rx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
 458 {
 459         struct sfc_rxq_info *rxq_info;
 460         struct sfc_rxq *rxq;
 461         struct sfc_evq *evq;
 462         int rc;
 463
 464         sfc_log_init(sa, "sw_index=%u", sw_index);
 465
 466         SFC_ASSERT(sw_index < sa->rxq_count);
 467
 468         rxq_info = &sa->rxq_info[sw_index];
 469         rxq = rxq_info->rxq;
 470         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 471
 472         evq = rxq->evq;
 473
 474         rc = sfc_ev_qstart(sa, evq->evq_index);
 475         if (rc != 0)
 476                 goto fail_ev_qstart;
 477
 478         rc = efx_rx_qcreate(sa->nic, rxq->hw_index, 0, rxq_info->type,
 479                             &rxq->mem, rxq_info->entries,
 480                             0 /* not used on EF10 */, evq->common,
 481                             &rxq->common);
 482         if (rc != 0)
 483                 goto fail_rx_qcreate;
 484
 485         efx_rx_qenable(rxq->common);
 486
 487         rxq->pending = rxq->completed = rxq->added = rxq->pushed = 0;
 488
 489         rxq->state |= (SFC_RXQ_STARTED | SFC_RXQ_RUNNING);
 490
 491         sfc_rx_qrefill(rxq);
 492
 493         if (sw_index == 0) {
 494                 rc = sfc_rx_default_rxq_set_filter(sa, rxq);
 495                 if (rc != 0)
 496                         goto fail_mac_filter_default_rxq_set;
 497         }
 498
 499         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 500         sa->eth_dev->data->rx_queue_state[sw_index] =
 501                 RTE_ETH_QUEUE_STATE_STARTED;
 502
 503         return 0;
 504
 505 fail_mac_filter_default_rxq_set:
 506         sfc_rx_qflush(sa, sw_index);
 507
 508 fail_rx_qcreate:
 509         sfc_ev_qstop(sa, evq->evq_index);
 510
 511 fail_ev_qstart:
 512         return rc;
 513 }
 514
 515 void
 516 sfc_rx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
 517 {
 518         struct sfc_rxq_info *rxq_info;
 519         struct sfc_rxq *rxq;
 520
 521         sfc_log_init(sa, "sw_index=%u", sw_index);
 522
 523         SFC_ASSERT(sw_index < sa->rxq_count);
 524
 525         rxq_info = &sa->rxq_info[sw_index];
 526         rxq = rxq_info->rxq;
 527
 528         if (rxq->state == SFC_RXQ_INITIALIZED)
 529                 return;
 530         SFC_ASSERT(rxq->state & SFC_RXQ_STARTED);
 531
 532         /* It seems to be used by DPDK for debug purposes only ('rte_ether') */
 533         sa->eth_dev->data->rx_queue_state[sw_index] =
 534                 RTE_ETH_QUEUE_STATE_STOPPED;
 535
 536         rxq->state &= ~SFC_RXQ_RUNNING;
 537
 538         if (sw_index == 0)
 539                 efx_mac_filter_default_rxq_clear(sa->nic);
 540
 541         sfc_rx_qflush(sa, sw_index);
 542
 543         rxq->state = SFC_RXQ_INITIALIZED;
 544
 545         efx_rx_qdestroy(rxq->common);
 546
 547         sfc_ev_qstop(sa, rxq->evq->evq_index);
 548 }
 549
 550 static int
 551 sfc_rx_qcheck_conf(struct sfc_adapter *sa, uint16_t nb_rx_desc,
 552                    const struct rte_eth_rxconf *rx_conf)
 553 {
 554         const uint16_t rx_free_thresh_max = EFX_RXQ_LIMIT(nb_rx_desc);
 555         int rc = 0;
 556
 557         if (rx_conf->rx_thresh.pthresh != 0 ||
 558             rx_conf->rx_thresh.hthresh != 0 ||
 559             rx_conf->rx_thresh.wthresh != 0) {
 560                 sfc_err(sa,
 561                         "RxQ prefetch/host/writeback thresholds are not supported");
 562                 rc = EINVAL;
 563         }
 564
 565         if (rx_conf->rx_free_thresh > rx_free_thresh_max) {
 566                 sfc_err(sa,
 567                         "RxQ free threshold too large: %u vs maximum %u",
 568                         rx_conf->rx_free_thresh, rx_free_thresh_max);
 569                 rc = EINVAL;
 570         }
 571
 572         if (rx_conf->rx_drop_en == 0) {
 573                 sfc_err(sa, "RxQ drop disable is not supported");
 574                 rc = EINVAL;
 575         }
 576
 577         return rc;
 578 }
 579
 580 static unsigned int
 581 sfc_rx_mbuf_data_alignment(struct rte_mempool *mb_pool)
 582 {
 583         uint32_t data_off;
 584         uint32_t order;
 585
 586         /* The mbuf object itself is always cache line aligned */
 587         order = rte_bsf32(RTE_CACHE_LINE_SIZE);
 588
 589         /* Data offset from mbuf object start */
 590         data_off = sizeof(struct rte_mbuf) + rte_pktmbuf_priv_size(mb_pool) +
 591                 RTE_PKTMBUF_HEADROOM;
 592
 593         order = MIN(order, rte_bsf32(data_off));
 594
 595         return 1u << (order - 1);
 596 }
 597
 598 static uint16_t
 599 sfc_rx_mb_pool_buf_size(struct sfc_adapter *sa, struct rte_mempool *mb_pool)
 600 {
 601         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 602         const uint32_t nic_align_start = MAX(1, encp->enc_rx_buf_align_start);
 603         const uint32_t nic_align_end = MAX(1, encp->enc_rx_buf_align_end);
 604         uint16_t buf_size;
 605         unsigned int buf_aligned;
 606         unsigned int start_alignment;
 607         unsigned int end_padding_alignment;
 608
 609         /* Below it is assumed that both alignments are power of 2 */
 610         SFC_ASSERT(rte_is_power_of_2(nic_align_start));
 611         SFC_ASSERT(rte_is_power_of_2(nic_align_end));
 612
 613         /*
 614          * mbuf is always cache line aligned, double-check
 615          * that it meets rx buffer start alignment requirements.
 616          */
 617
 618         /* Start from mbuf pool data room size */
 619         buf_size = rte_pktmbuf_data_room_size(mb_pool);
 620
 621         /* Remove headroom */
 622         if (buf_size <= RTE_PKTMBUF_HEADROOM) {
 623                 sfc_err(sa,
 624                         "RxQ mbuf pool %s object data room size %u is smaller than headroom %u",
 625                         mb_pool->name, buf_size, RTE_PKTMBUF_HEADROOM);
 626                 return 0;
 627         }
 628         buf_size -= RTE_PKTMBUF_HEADROOM;
 629
 630         /* Calculate guaranteed data start alignment */
 631         buf_aligned = sfc_rx_mbuf_data_alignment(mb_pool);
 632
 633         /* Reserve space for start alignment */
 634         if (buf_aligned < nic_align_start) {
 635                 start_alignment = nic_align_start - buf_aligned;
 636                 if (buf_size <= start_alignment) {
 637                         sfc_err(sa,
 638                                 "RxQ mbuf pool %s object data room size %u is insufficient for headroom %u and buffer start alignment %u required by NIC",
 639                                 mb_pool->name,
 640                                 rte_pktmbuf_data_room_size(mb_pool),
 641                                 RTE_PKTMBUF_HEADROOM, start_alignment);
 642                         return 0;
 643                 }
 644                 buf_aligned = nic_align_start;
 645                 buf_size -= start_alignment;
 646         } else {
 647                 start_alignment = 0;
 648         }
 649
 650         /* Make sure that end padding does not write beyond the buffer */
 651         if (buf_aligned < nic_align_end) {
 652                 /*
 653                  * Estimate space which can be lost. If guarnteed buffer
 654                  * size is odd, lost space is (nic_align_end - 1). More
 655                  * accurate formula is below.
 656                  */
 657                 end_padding_alignment = nic_align_end -
 658                         MIN(buf_aligned, 1u << (rte_bsf32(buf_size) - 1));
 659                 if (buf_size <= end_padding_alignment) {
 660                         sfc_err(sa,
 661                                 "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",
 662                                 mb_pool->name,
 663                                 rte_pktmbuf_data_room_size(mb_pool),
 664                                 RTE_PKTMBUF_HEADROOM, start_alignment,
 665                                 end_padding_alignment);
 666                         return 0;
 667                 }
 668                 buf_size -= end_padding_alignment;
 669         } else {
 670                 /*
 671                  * Start is aligned the same or better than end,
 672                  * just align length.
 673                  */
 674                 buf_size = P2ALIGN(buf_size, nic_align_end);
 675         }
 676
 677         return buf_size;
 678 }
 679
 680 int
 681 sfc_rx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
 682              uint16_t nb_rx_desc, unsigned int socket_id,
 683              const struct rte_eth_rxconf *rx_conf,
 684              struct rte_mempool *mb_pool)
 685 {
 686         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 687         int rc;
 688         uint16_t buf_size;
 689         struct sfc_rxq_info *rxq_info;
 690         unsigned int evq_index;
 691         struct sfc_evq *evq;
 692         struct sfc_rxq *rxq;
 693
 694         rc = sfc_rx_qcheck_conf(sa, nb_rx_desc, rx_conf);
 695         if (rc != 0)
 696                 goto fail_bad_conf;
 697
 698         buf_size = sfc_rx_mb_pool_buf_size(sa, mb_pool);
 699         if (buf_size == 0) {
 700                 sfc_err(sa, "RxQ %u mbuf pool object size is too small",
 701                         sw_index);
 702                 rc = EINVAL;
 703                 goto fail_bad_conf;
 704         }
 705
 706         if ((buf_size < sa->port.pdu + encp->enc_rx_prefix_size) &&
 707             !sa->eth_dev->data->dev_conf.rxmode.enable_scatter) {
 708                 sfc_err(sa, "Rx scatter is disabled and RxQ %u mbuf pool "
 709                         "object size is too small", sw_index);
 710                 sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
 711                         "PDU size %u plus Rx prefix %u bytes",
 712                         sw_index, buf_size, (unsigned int)sa->port.pdu,
 713                         encp->enc_rx_prefix_size);
 714                 rc = EINVAL;
 715                 goto fail_bad_conf;
 716         }
 717
 718         SFC_ASSERT(sw_index < sa->rxq_count);
 719         rxq_info = &sa->rxq_info[sw_index];
 720
 721         SFC_ASSERT(nb_rx_desc <= rxq_info->max_entries);
 722         rxq_info->entries = nb_rx_desc;
 723         rxq_info->type =
 724                 sa->eth_dev->data->dev_conf.rxmode.enable_scatter ?
 725                 EFX_RXQ_TYPE_SCATTER : EFX_RXQ_TYPE_DEFAULT;
 726
 727         evq_index = sfc_evq_index_by_rxq_sw_index(sa, sw_index);
 728
 729         rc = sfc_ev_qinit(sa, evq_index, rxq_info->entries, socket_id);
 730         if (rc != 0)
 731                 goto fail_ev_qinit;
 732
 733         evq = sa->evq_info[evq_index].evq;
 734
 735         rc = ENOMEM;
 736         rxq = rte_zmalloc_socket("sfc-rxq", sizeof(*rxq), RTE_CACHE_LINE_SIZE,
 737                                  socket_id);
 738         if (rxq == NULL)
 739                 goto fail_rxq_alloc;
 740
 741         rc = sfc_dma_alloc(sa, "rxq", sw_index, EFX_RXQ_SIZE(rxq_info->entries),
 742                            socket_id, &rxq->mem);
 743         if (rc != 0)
 744                 goto fail_dma_alloc;
 745
 746         rc = ENOMEM;
 747         rxq->sw_desc = rte_calloc_socket("sfc-rxq-sw_desc", rxq_info->entries,
 748                                          sizeof(*rxq->sw_desc),
 749                                          RTE_CACHE_LINE_SIZE, socket_id);
 750         if (rxq->sw_desc == NULL)
 751                 goto fail_desc_alloc;
 752
 753         evq->rxq = rxq;
 754         rxq->evq = evq;
 755         rxq->ptr_mask = rxq_info->entries - 1;
 756         rxq->refill_threshold = rx_conf->rx_free_thresh;
 757         rxq->refill_mb_pool = mb_pool;
 758         rxq->buf_size = buf_size;
 759         rxq->hw_index = sw_index;
 760         rxq->port_id = sa->eth_dev->data->port_id;
 761
 762         /* Cache limits required on datapath in RxQ structure */
 763         rxq->batch_max = encp->enc_rx_batch_max;
 764         rxq->prefix_size = encp->enc_rx_prefix_size;
 765
 766 #if EFSYS_OPT_RX_SCALE
 767         if (sa->hash_support == EFX_RX_HASH_AVAILABLE)
 768                 rxq->flags |= SFC_RXQ_FLAG_RSS_HASH;
 769 #endif
 770
 771         rxq->state = SFC_RXQ_INITIALIZED;
 772
 773         rxq_info->rxq = rxq;
 774         rxq_info->deferred_start = (rx_conf->rx_deferred_start != 0);
 775
 776         return 0;
 777
 778 fail_desc_alloc:
 779         sfc_dma_free(sa, &rxq->mem);
 780
 781 fail_dma_alloc:
 782         rte_free(rxq);
 783
 784 fail_rxq_alloc:
 785         sfc_ev_qfini(sa, evq_index);
 786
 787 fail_ev_qinit:
 788         rxq_info->entries = 0;
 789
 790 fail_bad_conf:
 791         sfc_log_init(sa, "failed %d", rc);
 792         return rc;
 793 }
 794
 795 void
 796 sfc_rx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
 797 {
 798         struct sfc_rxq_info *rxq_info;
 799         struct sfc_rxq *rxq;
 800
 801         SFC_ASSERT(sw_index < sa->rxq_count);
 802
 803         rxq_info = &sa->rxq_info[sw_index];
 804
 805         rxq = rxq_info->rxq;
 806         SFC_ASSERT(rxq->state == SFC_RXQ_INITIALIZED);
 807
 808         rxq_info->rxq = NULL;
 809         rxq_info->entries = 0;
 810
 811         rte_free(rxq->sw_desc);
 812         sfc_dma_free(sa, &rxq->mem);
 813         rte_free(rxq);
 814 }
 815
 816 #if EFSYS_OPT_RX_SCALE
 817 efx_rx_hash_type_t
 818 sfc_rte_to_efx_hash_type(uint64_t rss_hf)
 819 {
 820         efx_rx_hash_type_t efx_hash_types = 0;
 821
 822         if ((rss_hf & (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
 823                        ETH_RSS_NONFRAG_IPV4_OTHER)) != 0)
 824                 efx_hash_types |= EFX_RX_HASH_IPV4;
 825
 826         if ((rss_hf & ETH_RSS_NONFRAG_IPV4_TCP) != 0)
 827                 efx_hash_types |= EFX_RX_HASH_TCPIPV4;
 828
 829         if ((rss_hf & (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
 830                         ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX)) != 0)
 831                 efx_hash_types |= EFX_RX_HASH_IPV6;
 832
 833         if ((rss_hf & (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX)) != 0)
 834                 efx_hash_types |= EFX_RX_HASH_TCPIPV6;
 835
 836         return efx_hash_types;
 837 }
 838
 839 uint64_t
 840 sfc_efx_to_rte_hash_type(efx_rx_hash_type_t efx_hash_types)
 841 {
 842         uint64_t rss_hf = 0;
 843
 844         if ((efx_hash_types & EFX_RX_HASH_IPV4) != 0)
 845                 rss_hf |= (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
 846                            ETH_RSS_NONFRAG_IPV4_OTHER);
 847
 848         if ((efx_hash_types & EFX_RX_HASH_TCPIPV4) != 0)
 849                 rss_hf |= ETH_RSS_NONFRAG_IPV4_TCP;
 850
 851         if ((efx_hash_types & EFX_RX_HASH_IPV6) != 0)
 852                 rss_hf |= (ETH_RSS_IPV6 | ETH_RSS_FRAG_IPV6 |
 853                            ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX);
 854
 855         if ((efx_hash_types & EFX_RX_HASH_TCPIPV6) != 0)
 856                 rss_hf |= (ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_IPV6_TCP_EX);
 857
 858         return rss_hf;
 859 }
 860 #endif
 861
 862 static int
 863 sfc_rx_rss_config(struct sfc_adapter *sa)
 864 {
 865         int rc = 0;
 866
 867 #if EFSYS_OPT_RX_SCALE
 868         if (sa->rss_channels > 1) {
 869                 rc = efx_rx_scale_mode_set(sa->nic, EFX_RX_HASHALG_TOEPLITZ,
 870                                            sa->rss_hash_types, B_TRUE);
 871                 if (rc != 0)
 872                         goto finish;
 873
 874                 rc = efx_rx_scale_key_set(sa->nic, sa->rss_key,
 875                                           sizeof(sa->rss_key));
 876                 if (rc != 0)
 877                         goto finish;
 878
 879                 rc = efx_rx_scale_tbl_set(sa->nic, sa->rss_tbl,
 880                                           sizeof(sa->rss_tbl));
 881         }
 882
 883 finish:
 884 #endif
 885         return rc;
 886 }
 887
 888 int
 889 sfc_rx_start(struct sfc_adapter *sa)
 890 {
 891         unsigned int sw_index;
 892         int rc;
 893
 894         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 895
 896         rc = efx_rx_init(sa->nic);
 897         if (rc != 0)
 898                 goto fail_rx_init;
 899
 900         rc = sfc_rx_rss_config(sa);
 901         if (rc != 0)
 902                 goto fail_rss_config;
 903
 904         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
 905                 if ((!sa->rxq_info[sw_index].deferred_start ||
 906                      sa->rxq_info[sw_index].deferred_started)) {
 907                         rc = sfc_rx_qstart(sa, sw_index);
 908                         if (rc != 0)
 909                                 goto fail_rx_qstart;
 910                 }
 911         }
 912
 913         return 0;
 914
 915 fail_rx_qstart:
 916         while (sw_index-- > 0)
 917                 sfc_rx_qstop(sa, sw_index);
 918
 919 fail_rss_config:
 920         efx_rx_fini(sa->nic);
 921
 922 fail_rx_init:
 923         sfc_log_init(sa, "failed %d", rc);
 924         return rc;
 925 }
 926
 927 void
 928 sfc_rx_stop(struct sfc_adapter *sa)
 929 {
 930         unsigned int sw_index;
 931
 932         sfc_log_init(sa, "rxq_count=%u", sa->rxq_count);
 933
 934         sw_index = sa->rxq_count;
 935         while (sw_index-- > 0) {
 936                 if (sa->rxq_info[sw_index].rxq != NULL)
 937                         sfc_rx_qstop(sa, sw_index);
 938         }
 939
 940         efx_rx_fini(sa->nic);
 941 }
 942
 943 static int
 944 sfc_rx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
 945 {
 946         struct sfc_rxq_info *rxq_info = &sa->rxq_info[sw_index];
 947         unsigned int max_entries;
 948
 949         max_entries = EFX_RXQ_MAXNDESCS;
 950         SFC_ASSERT(rte_is_power_of_2(max_entries));
 951
 952         rxq_info->max_entries = max_entries;
 953
 954         return 0;
 955 }
 956
 957 static int
 958 sfc_rx_check_mode(struct sfc_adapter *sa, struct rte_eth_rxmode *rxmode)
 959 {
 960         int rc = 0;
 961
 962         switch (rxmode->mq_mode) {
 963         case ETH_MQ_RX_NONE:
 964                 /* No special checks are required */
 965                 break;
 966 #if EFSYS_OPT_RX_SCALE
 967         case ETH_MQ_RX_RSS:
 968                 if (sa->rss_support == EFX_RX_SCALE_UNAVAILABLE) {
 969                         sfc_err(sa, "RSS is not available");
 970                         rc = EINVAL;
 971                 }
 972                 break;
 973 #endif
 974         default:
 975                 sfc_err(sa, "Rx multi-queue mode %u not supported",
 976                         rxmode->mq_mode);
 977                 rc = EINVAL;
 978         }
 979
 980         if (rxmode->header_split) {
 981                 sfc_err(sa, "Header split on Rx not supported");
 982                 rc = EINVAL;
 983         }
 984
 985         if (rxmode->hw_vlan_filter) {
 986                 sfc_err(sa, "HW VLAN filtering not supported");
 987                 rc = EINVAL;
 988         }
 989
 990         if (rxmode->hw_vlan_strip) {
 991                 sfc_err(sa, "HW VLAN stripping not supported");
 992                 rc = EINVAL;
 993         }
 994
 995         if (rxmode->hw_vlan_extend) {
 996                 sfc_err(sa,
 997                         "Q-in-Q HW VLAN stripping not supported");
 998                 rc = EINVAL;
 999         }
1000
1001         if (!rxmode->hw_strip_crc) {
1002                 sfc_warn(sa,
1003                          "FCS stripping control not supported - always stripped");
1004                 rxmode->hw_strip_crc = 1;
1005         }
1006
1007         if (rxmode->enable_lro) {
1008                 sfc_err(sa, "LRO not supported");
1009                 rc = EINVAL;
1010         }
1011
1012         return rc;
1013 }
1014
1015 /**
1016  * Initialize Rx subsystem.
1017  *
1018  * Called at device configuration stage when number of receive queues is
1019  * specified together with other device level receive configuration.
1020  *
1021  * It should be used to allocate NUMA-unaware resources.
1022  */
1023 int
1024 sfc_rx_init(struct sfc_adapter *sa)
1025 {
1026         struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
1027         unsigned int sw_index;
1028         int rc;
1029
1030         rc = sfc_rx_check_mode(sa, &dev_conf->rxmode);
1031         if (rc != 0)
1032                 goto fail_check_mode;
1033
1034         sa->rxq_count = sa->eth_dev->data->nb_rx_queues;
1035
1036         rc = ENOMEM;
1037         sa->rxq_info = rte_calloc_socket("sfc-rxqs", sa->rxq_count,
1038                                          sizeof(struct sfc_rxq_info), 0,
1039                                          sa->socket_id);
1040         if (sa->rxq_info == NULL)
1041                 goto fail_rxqs_alloc;
1042
1043         for (sw_index = 0; sw_index < sa->rxq_count; ++sw_index) {
1044                 rc = sfc_rx_qinit_info(sa, sw_index);
1045                 if (rc != 0)
1046                         goto fail_rx_qinit_info;
1047         }
1048
1049 #if EFSYS_OPT_RX_SCALE
1050         sa->rss_channels = (dev_conf->rxmode.mq_mode == ETH_MQ_RX_RSS) ?
1051                            MIN(sa->rxq_count, EFX_MAXRSS) : 1;
1052
1053         if (sa->rss_channels > 1) {
1054                 for (sw_index = 0; sw_index < EFX_RSS_TBL_SIZE; ++sw_index)
1055                         sa->rss_tbl[sw_index] = sw_index % sa->rss_channels;
1056         }
1057 #endif
1058
1059         return 0;
1060
1061 fail_rx_qinit_info:
1062         rte_free(sa->rxq_info);
1063         sa->rxq_info = NULL;
1064
1065 fail_rxqs_alloc:
1066         sa->rxq_count = 0;
1067 fail_check_mode:
1068         sfc_log_init(sa, "failed %d", rc);
1069         return rc;
1070 }
1071
1072 /**
1073  * Shutdown Rx subsystem.
1074  *
1075  * Called at device close stage, for example, before device
1076  * reconfiguration or shutdown.
1077  */
1078 void
1079 sfc_rx_fini(struct sfc_adapter *sa)
1080 {
1081         unsigned int sw_index;
1082
1083         sw_index = sa->rxq_count;
1084         while (sw_index-- > 0) {
1085                 if (sa->rxq_info[sw_index].rxq != NULL)
1086                         sfc_rx_qfini(sa, sw_index);
1087         }
1088
1089         rte_free(sa->rxq_info);
1090         sa->rxq_info = NULL;
1091         sa->rxq_count = 0;
1092 }