drivers/net/bnxt/bnxt_rxq.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2014-2018 Broadcom
   3  * All rights reserved.
   4  */
   5
   6 #include <inttypes.h>
   7
   8 #include <rte_malloc.h>
   9
  10 #include "bnxt.h"
  11 #include "bnxt_filter.h"
  12 #include "bnxt_hwrm.h"
  13 #include "bnxt_ring.h"
  14 #include "bnxt_rxq.h"
  15 #include "bnxt_rxr.h"
  16 #include "bnxt_vnic.h"
  17 #include "hsi_struct_def_dpdk.h"
  18
  19 /*
  20  * RX Queues
  21  */
  22
  23 void bnxt_free_rxq_stats(struct bnxt_rx_queue *rxq)
  24 {
  25         if (rxq && rxq->cp_ring && rxq->cp_ring->hw_stats)
  26                 rxq->cp_ring->hw_stats = NULL;
  27 }
  28
  29 int bnxt_mq_rx_configure(struct bnxt *bp)
  30 {
  31         struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf;
  32         const struct rte_eth_vmdq_rx_conf *conf =
  33                     &dev_conf->rx_adv_conf.vmdq_rx_conf;
  34         unsigned int i, j, nb_q_per_grp = 1, ring_idx = 0;
  35         int start_grp_id, end_grp_id = 1, rc = 0;
  36         struct bnxt_vnic_info *vnic;
  37         struct bnxt_filter_info *filter;
  38         enum rte_eth_nb_pools pools = 1, max_pools = 0;
  39         struct bnxt_rx_queue *rxq;
  40
  41         bp->nr_vnics = 0;
  42
  43         /* Single queue mode */
  44         if (bp->rx_cp_nr_rings < 2) {
  45                 vnic = &bp->vnic_info[0];
  46                 if (!vnic) {
  47                         PMD_DRV_LOG(ERR, "VNIC alloc failed\n");
  48                         rc = -ENOMEM;
  49                         goto err_out;
  50                 }
  51                 vnic->flags |= BNXT_VNIC_INFO_BCAST;
  52                 bp->nr_vnics++;
  53
  54                 rxq = bp->eth_dev->data->rx_queues[0];
  55                 rxq->vnic = vnic;
  56
  57                 vnic->func_default = true;
  58                 vnic->start_grp_id = 0;
  59                 vnic->end_grp_id = vnic->start_grp_id;
  60                 filter = bnxt_alloc_filter(bp);
  61                 if (!filter) {
  62                         PMD_DRV_LOG(ERR, "L2 filter alloc failed\n");
  63                         rc = -ENOMEM;
  64                         goto err_out;
  65                 }
  66                 filter->mac_index = 0;
  67                 filter->flags |= HWRM_CFA_L2_FILTER_ALLOC_INPUT_FLAGS_OUTERMOST;
  68                 STAILQ_INSERT_TAIL(&vnic->filter, filter, next);
  69                 goto out;
  70         }
  71
  72         /* Multi-queue mode */
  73         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_VMDQ_DCB_RSS) {
  74                 /* VMDq ONLY, VMDq+RSS, VMDq+DCB, VMDq+DCB+RSS */
  75
  76                 switch (dev_conf->rxmode.mq_mode) {
  77                 case ETH_MQ_RX_VMDQ_RSS:
  78                 case ETH_MQ_RX_VMDQ_ONLY:
  79                 case ETH_MQ_RX_VMDQ_DCB_RSS:
  80                         /* FALLTHROUGH */
  81                         /* ETH_8/64_POOLs */
  82                         pools = conf->nb_queue_pools;
  83                         /* For each pool, allocate MACVLAN CFA rule & VNIC */
  84                         max_pools = RTE_MIN(bp->max_vnics,
  85                                             RTE_MIN(bp->max_l2_ctx,
  86                                             RTE_MIN(bp->max_rsscos_ctx,
  87                                                     ETH_64_POOLS)));
  88                         PMD_DRV_LOG(DEBUG,
  89                                     "pools = %u max_pools = %u\n",
  90                                     pools, max_pools);
  91                         if (pools > max_pools)
  92                                 pools = max_pools;
  93                         break;
  94                 case ETH_MQ_RX_RSS:
  95                         pools = bp->rx_cosq_cnt ? bp->rx_cosq_cnt : 1;
  96                         break;
  97                 default:
  98                         PMD_DRV_LOG(ERR, "Unsupported mq_mod %d\n",
  99                                 dev_conf->rxmode.mq_mode);
 100                         rc = -EINVAL;
 101                         goto err_out;
 102                 }
 103         } else if (!dev_conf->rxmode.mq_mode) {
 104                 pools = bp->rx_cosq_cnt ? bp->rx_cosq_cnt : pools;
 105         }
 106
 107         pools = RTE_MIN(pools, bp->rx_cp_nr_rings);
 108         nb_q_per_grp = bp->rx_cp_nr_rings / pools;
 109         bp->rx_num_qs_per_vnic = nb_q_per_grp;
 110         PMD_DRV_LOG(DEBUG, "pools = %u nb_q_per_grp = %u\n",
 111                     pools, nb_q_per_grp);
 112         start_grp_id = 0;
 113         end_grp_id = nb_q_per_grp;
 114
 115         for (i = 0; i < pools; i++) {
 116                 vnic = &bp->vnic_info[i];
 117                 if (!vnic) {
 118                         PMD_DRV_LOG(ERR, "VNIC alloc failed\n");
 119                         rc = -ENOMEM;
 120                         goto err_out;
 121                 }
 122                 vnic->flags |= BNXT_VNIC_INFO_BCAST;
 123                 bp->nr_vnics++;
 124
 125                 for (j = 0; j < nb_q_per_grp; j++, ring_idx++) {
 126                         rxq = bp->eth_dev->data->rx_queues[ring_idx];
 127                         rxq->vnic = vnic;
 128                         PMD_DRV_LOG(DEBUG,
 129                                     "rxq[%d] = %p vnic[%d] = %p\n",
 130                                     ring_idx, rxq, i, vnic);
 131                 }
 132                 if (i == 0) {
 133                         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_VMDQ_DCB) {
 134                                 bp->eth_dev->data->promiscuous = 1;
 135                                 vnic->flags |= BNXT_VNIC_INFO_PROMISC;
 136                         }
 137                         vnic->func_default = true;
 138                 }
 139                 vnic->start_grp_id = start_grp_id;
 140                 vnic->end_grp_id = end_grp_id;
 141
 142                 if (i) {
 143                         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_VMDQ_DCB ||
 144                             !(dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS))
 145                                 vnic->rss_dflt_cr = true;
 146                         goto skip_filter_allocation;
 147                 }
 148                 filter = bnxt_alloc_filter(bp);
 149                 if (!filter) {
 150                         PMD_DRV_LOG(ERR, "L2 filter alloc failed\n");
 151                         rc = -ENOMEM;
 152                         goto err_out;
 153                 }
 154                 filter->mac_index = 0;
 155                 filter->flags |= HWRM_CFA_L2_FILTER_ALLOC_INPUT_FLAGS_OUTERMOST;
 156                 /*
 157                  * TODO: Configure & associate CFA rule for
 158                  * each VNIC for each VMDq with MACVLAN, MACVLAN+TC
 159                  */
 160                 STAILQ_INSERT_TAIL(&vnic->filter, filter, next);
 161
 162 skip_filter_allocation:
 163                 start_grp_id = end_grp_id;
 164                 end_grp_id += nb_q_per_grp;
 165         }
 166
 167 out:
 168         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) {
 169                 struct rte_eth_rss_conf *rss = &dev_conf->rx_adv_conf.rss_conf;
 170
 171                 if (bp->flags & BNXT_FLAG_UPDATE_HASH)
 172                         bp->flags &= ~BNXT_FLAG_UPDATE_HASH;
 173
 174                 for (i = 0; i < bp->nr_vnics; i++) {
 175                         uint32_t lvl = ETH_RSS_LEVEL(rss->rss_hf);
 176
 177                         vnic = &bp->vnic_info[i];
 178                         vnic->hash_type =
 179                                 bnxt_rte_to_hwrm_hash_types(rss->rss_hf);
 180                         vnic->hash_mode =
 181                                 bnxt_rte_to_hwrm_hash_level(bp,
 182                                                             rss->rss_hf,
 183                                                             lvl);
 184
 185                         /*
 186                          * Use the supplied key if the key length is
 187                          * acceptable and the rss_key is not NULL
 188                          */
 189                         if (rss->rss_key &&
 190                             rss->rss_key_len <= HW_HASH_KEY_SIZE)
 191                                 memcpy(vnic->rss_hash_key,
 192                                        rss->rss_key, rss->rss_key_len);
 193                 }
 194         }
 195
 196         return rc;
 197
 198 err_out:
 199         /* Free allocated vnic/filters */
 200
 201         return rc;
 202 }
 203
 204 void bnxt_rx_queue_release_mbufs(struct bnxt_rx_queue *rxq)
 205 {
 206         struct rte_mbuf **sw_ring;
 207         struct bnxt_tpa_info *tpa_info;
 208         uint16_t i;
 209
 210         if (!rxq)
 211                 return;
 212
 213         rte_spinlock_lock(&rxq->lock);
 214
 215         sw_ring = rxq->rx_ring->rx_buf_ring;
 216         if (sw_ring) {
 217                 for (i = 0;
 218                      i < rxq->rx_ring->rx_ring_struct->ring_size; i++) {
 219                         if (sw_ring[i]) {
 220                                 if (sw_ring[i] != &rxq->fake_mbuf)
 221                                         rte_pktmbuf_free_seg(sw_ring[i]);
 222                                 sw_ring[i] = NULL;
 223                         }
 224                 }
 225         }
 226         /* Free up mbufs in Agg ring */
 227         sw_ring = rxq->rx_ring->ag_buf_ring;
 228         if (sw_ring) {
 229                 for (i = 0;
 230                      i < rxq->rx_ring->ag_ring_struct->ring_size; i++) {
 231                         if (sw_ring[i]) {
 232                                 rte_pktmbuf_free_seg(sw_ring[i]);
 233                                 sw_ring[i] = NULL;
 234                         }
 235                 }
 236         }
 237
 238         /* Free up mbufs in TPA */
 239         tpa_info = rxq->rx_ring->tpa_info;
 240         if (tpa_info) {
 241                 int max_aggs = BNXT_TPA_MAX_AGGS(rxq->bp);
 242
 243                 for (i = 0; i < max_aggs; i++) {
 244                         if (tpa_info[i].mbuf) {
 245                                 rte_pktmbuf_free_seg(tpa_info[i].mbuf);
 246                                 tpa_info[i].mbuf = NULL;
 247                         }
 248                 }
 249         }
 250
 251         rte_spinlock_unlock(&rxq->lock);
 252 }
 253
 254 void bnxt_free_rx_mbufs(struct bnxt *bp)
 255 {
 256         struct bnxt_rx_queue *rxq;
 257         int i;
 258
 259         for (i = 0; i < (int)bp->rx_nr_rings; i++) {
 260                 rxq = bp->rx_queues[i];
 261                 bnxt_rx_queue_release_mbufs(rxq);
 262         }
 263 }
 264
 265 void bnxt_rx_queue_release_op(void *rx_queue)
 266 {
 267         struct bnxt_rx_queue *rxq = (struct bnxt_rx_queue *)rx_queue;
 268
 269         if (rxq) {
 270                 if (is_bnxt_in_error(rxq->bp))
 271                         return;
 272
 273                 bnxt_rx_queue_release_mbufs(rxq);
 274
 275                 /* Free RX ring hardware descriptors */
 276                 bnxt_free_ring(rxq->rx_ring->rx_ring_struct);
 277                 /* Free RX Agg ring hardware descriptors */
 278                 bnxt_free_ring(rxq->rx_ring->ag_ring_struct);
 279
 280                 /* Free RX completion ring hardware descriptors */
 281                 bnxt_free_ring(rxq->cp_ring->cp_ring_struct);
 282
 283                 bnxt_free_rxq_stats(rxq);
 284                 rte_memzone_free(rxq->mz);
 285                 rxq->mz = NULL;
 286
 287                 rte_free(rxq);
 288         }
 289 }
 290
 291 int bnxt_rx_queue_setup_op(struct rte_eth_dev *eth_dev,
 292                                uint16_t queue_idx,
 293                                uint16_t nb_desc,
 294                                unsigned int socket_id,
 295                                const struct rte_eth_rxconf *rx_conf,
 296                                struct rte_mempool *mp)
 297 {
 298         struct bnxt *bp = eth_dev->data->dev_private;
 299         uint64_t rx_offloads = eth_dev->data->dev_conf.rxmode.offloads;
 300         struct bnxt_rx_queue *rxq;
 301         int rc = 0;
 302         uint8_t queue_state;
 303
 304         rc = is_bnxt_in_error(bp);
 305         if (rc)
 306                 return rc;
 307
 308         if (queue_idx >= BNXT_MAX_RINGS(bp)) {
 309                 PMD_DRV_LOG(ERR,
 310                         "Cannot create Rx ring %d. Only %d rings available\n",
 311                         queue_idx, bp->max_rx_rings);
 312                 return -EINVAL;
 313         }
 314
 315         if (nb_desc < BNXT_MIN_RING_DESC || nb_desc > MAX_RX_DESC_CNT) {
 316                 PMD_DRV_LOG(ERR, "nb_desc %d is invalid\n", nb_desc);
 317                 rc = -EINVAL;
 318                 goto out;
 319         }
 320
 321         if (eth_dev->data->rx_queues) {
 322                 rxq = eth_dev->data->rx_queues[queue_idx];
 323                 if (rxq)
 324                         bnxt_rx_queue_release_op(rxq);
 325         }
 326         rxq = rte_zmalloc_socket("bnxt_rx_queue", sizeof(struct bnxt_rx_queue),
 327                                  RTE_CACHE_LINE_SIZE, socket_id);
 328         if (!rxq) {
 329                 PMD_DRV_LOG(ERR, "bnxt_rx_queue allocation failed!\n");
 330                 rc = -ENOMEM;
 331                 goto out;
 332         }
 333         rxq->bp = bp;
 334         rxq->mb_pool = mp;
 335         rxq->nb_rx_desc = nb_desc;
 336         rxq->rx_free_thresh =
 337                 RTE_MIN(rte_align32pow2(nb_desc) / 4, RTE_BNXT_MAX_RX_BURST);
 338
 339         if (rx_conf->rx_drop_en != BNXT_DEFAULT_RX_DROP_EN)
 340                 PMD_DRV_LOG(NOTICE,
 341                             "Per-queue config of drop-en is not supported.\n");
 342         rxq->drop_en = BNXT_DEFAULT_RX_DROP_EN;
 343
 344         PMD_DRV_LOG(DEBUG, "RX Buf MTU %d\n", eth_dev->data->mtu);
 345
 346         rc = bnxt_init_rx_ring_struct(rxq, socket_id);
 347         if (rc)
 348                 goto out;
 349
 350         PMD_DRV_LOG(DEBUG, "RX Buf size is %d\n", rxq->rx_buf_size);
 351         rxq->queue_id = queue_idx;
 352         rxq->port_id = eth_dev->data->port_id;
 353         if (rx_offloads & DEV_RX_OFFLOAD_KEEP_CRC)
 354                 rxq->crc_len = RTE_ETHER_CRC_LEN;
 355         else
 356                 rxq->crc_len = 0;
 357
 358         eth_dev->data->rx_queues[queue_idx] = rxq;
 359         /* Allocate RX ring hardware descriptors */
 360         if (bnxt_alloc_rings(bp, queue_idx, NULL, rxq, rxq->cp_ring, NULL,
 361                              "rxr")) {
 362                 PMD_DRV_LOG(ERR,
 363                         "ring_dma_zone_reserve for rx_ring failed!\n");
 364                 bnxt_rx_queue_release_op(rxq);
 365                 rc = -ENOMEM;
 366                 goto out;
 367         }
 368         rte_atomic64_init(&rxq->rx_mbuf_alloc_fail);
 369
 370         /* rxq 0 must not be stopped when used as async CPR */
 371         if (!BNXT_NUM_ASYNC_CPR(bp) && queue_idx == 0)
 372                 rxq->rx_deferred_start = false;
 373         else
 374                 rxq->rx_deferred_start = rx_conf->rx_deferred_start;
 375
 376         if (rxq->rx_deferred_start) {
 377                 queue_state = RTE_ETH_QUEUE_STATE_STOPPED;
 378                 rxq->rx_started = false;
 379         } else {
 380                 queue_state = RTE_ETH_QUEUE_STATE_STARTED;
 381                 rxq->rx_started = true;
 382         }
 383         eth_dev->data->rx_queue_state[queue_idx] = queue_state;
 384         rte_spinlock_init(&rxq->lock);
 385
 386         /* Configure mtu if it is different from what was configured before */
 387         if (!queue_idx)
 388                 bnxt_mtu_set_op(eth_dev, eth_dev->data->mtu);
 389
 390 out:
 391         return rc;
 392 }
 393
 394 int
 395 bnxt_rx_queue_intr_enable_op(struct rte_eth_dev *eth_dev, uint16_t queue_id)
 396 {
 397         struct bnxt *bp = eth_dev->data->dev_private;
 398         struct bnxt_rx_queue *rxq;
 399         struct bnxt_cp_ring_info *cpr;
 400         int rc = 0;
 401
 402         rc = is_bnxt_in_error(bp);
 403         if (rc)
 404                 return rc;
 405
 406         if (eth_dev->data->rx_queues) {
 407                 rxq = eth_dev->data->rx_queues[queue_id];
 408                 if (!rxq)
 409                         return -EINVAL;
 410
 411                 cpr = rxq->cp_ring;
 412                 B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
 413         }
 414         return rc;
 415 }
 416
 417 int
 418 bnxt_rx_queue_intr_disable_op(struct rte_eth_dev *eth_dev, uint16_t queue_id)
 419 {
 420         struct bnxt *bp = eth_dev->data->dev_private;
 421         struct bnxt_rx_queue *rxq;
 422         struct bnxt_cp_ring_info *cpr;
 423         int rc = 0;
 424
 425         rc = is_bnxt_in_error(bp);
 426         if (rc)
 427                 return rc;
 428
 429         if (eth_dev->data->rx_queues) {
 430                 rxq = eth_dev->data->rx_queues[queue_id];
 431                 if (!rxq)
 432                         return -EINVAL;
 433
 434                 cpr = rxq->cp_ring;
 435                 B_CP_DB_DISARM(cpr);
 436         }
 437         return rc;
 438 }
 439
 440 int bnxt_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 441 {
 442         struct bnxt *bp = dev->data->dev_private;
 443         struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf;
 444         struct bnxt_rx_queue *rxq = bp->rx_queues[rx_queue_id];
 445         struct bnxt_vnic_info *vnic = NULL;
 446         int rc = 0;
 447
 448         rc = is_bnxt_in_error(bp);
 449         if (rc)
 450                 return rc;
 451
 452         if (rxq == NULL) {
 453                 PMD_DRV_LOG(ERR, "Invalid Rx queue %d\n", rx_queue_id);
 454                 return -EINVAL;
 455         }
 456
 457         /* Set the queue state to started here.
 458          * We check the status of the queue while posting buffer.
 459          * If queue is it started, we do not post buffers for Rx.
 460          */
 461         rxq->rx_started = true;
 462         dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STARTED;
 463
 464         bnxt_free_hwrm_rx_ring(bp, rx_queue_id);
 465         rc = bnxt_alloc_hwrm_rx_ring(bp, rx_queue_id);
 466         if (rc)
 467                 return rc;
 468
 469         if (BNXT_CHIP_THOR(bp)) {
 470                 /* Reconfigure default receive ring and MRU. */
 471                 bnxt_hwrm_vnic_cfg(bp, rxq->vnic);
 472         }
 473         PMD_DRV_LOG(INFO, "Rx queue started %d\n", rx_queue_id);
 474
 475         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) {
 476                 vnic = rxq->vnic;
 477
 478                 if (BNXT_HAS_RING_GRPS(bp)) {
 479                         if (vnic->fw_grp_ids[rx_queue_id] != INVALID_HW_RING_ID)
 480                                 return 0;
 481
 482                         vnic->fw_grp_ids[rx_queue_id] =
 483                                         bp->grp_info[rx_queue_id].fw_grp_id;
 484                         PMD_DRV_LOG(DEBUG,
 485                                     "vnic = %p fw_grp_id = %d\n",
 486                                     vnic, bp->grp_info[rx_queue_id].fw_grp_id);
 487                 }
 488
 489                 PMD_DRV_LOG(DEBUG, "Rx Queue Count %d\n", vnic->rx_queue_cnt);
 490                 rc = bnxt_vnic_rss_configure(bp, vnic);
 491         }
 492
 493         if (rc != 0) {
 494                 dev->data->rx_queue_state[rx_queue_id] =
 495                                 RTE_ETH_QUEUE_STATE_STOPPED;
 496                 rxq->rx_started = false;
 497         }
 498
 499         PMD_DRV_LOG(INFO,
 500                     "queue %d, rx_deferred_start %d, state %d!\n",
 501                     rx_queue_id, rxq->rx_deferred_start,
 502                     bp->eth_dev->data->rx_queue_state[rx_queue_id]);
 503
 504         return rc;
 505 }
 506
 507 int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 508 {
 509         struct bnxt *bp = dev->data->dev_private;
 510         struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf;
 511         struct bnxt_vnic_info *vnic = NULL;
 512         struct bnxt_rx_queue *rxq = NULL;
 513         int active_queue_cnt = 0;
 514         int i, rc = 0;
 515
 516         rc = is_bnxt_in_error(bp);
 517         if (rc)
 518                 return rc;
 519
 520         /* For the stingray platform and other platforms needing tighter
 521          * control of resource utilization, Rx CQ 0 also works as
 522          * Default CQ for async notifications
 523          */
 524         if (!BNXT_NUM_ASYNC_CPR(bp) && !rx_queue_id) {
 525                 PMD_DRV_LOG(ERR, "Cannot stop Rx queue id %d\n", rx_queue_id);
 526                 return -EINVAL;
 527         }
 528
 529         rxq = bp->rx_queues[rx_queue_id];
 530         if (!rxq) {
 531                 PMD_DRV_LOG(ERR, "Invalid Rx queue %d\n", rx_queue_id);
 532                 return -EINVAL;
 533         }
 534
 535         vnic = rxq->vnic;
 536         if (!vnic) {
 537                 PMD_DRV_LOG(ERR, "VNIC not initialized for RxQ %d\n",
 538                             rx_queue_id);
 539                 return -EINVAL;
 540         }
 541
 542         dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
 543         rxq->rx_started = false;
 544         PMD_DRV_LOG(DEBUG, "Rx queue stopped\n");
 545
 546         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) {
 547                 if (BNXT_HAS_RING_GRPS(bp))
 548                         vnic->fw_grp_ids[rx_queue_id] = INVALID_HW_RING_ID;
 549
 550                 PMD_DRV_LOG(DEBUG, "Rx Queue Count %d\n", vnic->rx_queue_cnt);
 551                 rc = bnxt_vnic_rss_configure(bp, vnic);
 552         }
 553
 554         if (BNXT_CHIP_THOR(bp)) {
 555                 /* Compute current number of active receive queues. */
 556                 for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++)
 557                         if (bp->rx_queues[i]->rx_started)
 558                                 active_queue_cnt++;
 559
 560                 /*
 561                  * For Thor, we need to ensure that the VNIC default receive
 562                  * ring corresponds to an active receive queue. When no queue
 563                  * is active, we need to temporarily set the MRU to zero so
 564                  * that packets are dropped early in the receive pipeline in
 565                  * order to prevent the VNIC default receive ring from being
 566                  * accessed.
 567                  */
 568                 if (active_queue_cnt == 0) {
 569                         uint16_t saved_mru = vnic->mru;
 570
 571                         vnic->mru = 0;
 572                         /* Reconfigure default receive ring and MRU. */
 573                         bnxt_hwrm_vnic_cfg(bp, vnic);
 574                         vnic->mru = saved_mru;
 575                 } else {
 576                         /* Reconfigure default receive ring. */
 577                         bnxt_hwrm_vnic_cfg(bp, vnic);
 578                 }
 579         }
 580
 581         if (rc == 0)
 582                 bnxt_rx_queue_release_mbufs(rxq);
 583
 584         return rc;
 585 }