1 /*- 2 * Copyright (c) 2015 Mellanox Technologies. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include "en.h" 29 #include <machine/in_cksum.h> 30 31 static inline int 32 mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, 33 struct mlx5e_rx_wqe *wqe, u16 ix) 34 { 35 bus_dma_segment_t segs[MLX5E_MAX_BUSDMA_RX_SEGS]; 36 struct mbuf *mb; 37 int nsegs; 38 int err; 39 struct mbuf *mb_head; 40 int i; 41 42 if (rq->mbuf[ix].mbuf != NULL) 43 return (0); 44 45 mb_head = mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, 46 MLX5E_MAX_RX_BYTES); 47 if (unlikely(mb == NULL)) 48 return (-ENOMEM); 49 50 mb->m_len = MLX5E_MAX_RX_BYTES; 51 mb->m_pkthdr.len = MLX5E_MAX_RX_BYTES; 52 53 for (i = 1; i < rq->nsegs; i++) { 54 if (mb_head->m_pkthdr.len >= rq->wqe_sz) 55 break; 56 mb = mb->m_next = m_getjcl(M_NOWAIT, MT_DATA, 0, 57 MLX5E_MAX_RX_BYTES); 58 if (unlikely(mb == NULL)) { 59 m_freem(mb_head); 60 return (-ENOMEM); 61 } 62 mb->m_len = MLX5E_MAX_RX_BYTES; 63 mb_head->m_pkthdr.len += MLX5E_MAX_RX_BYTES; 64 } 65 /* rewind to first mbuf in chain */ 66 mb = mb_head; 67 68 /* get IP header aligned */ 69 m_adj(mb, MLX5E_NET_IP_ALIGN); 70 71 err = -bus_dmamap_load_mbuf_sg(rq->dma_tag, rq->mbuf[ix].dma_map, 72 mb, segs, &nsegs, BUS_DMA_NOWAIT); 73 if (err != 0) 74 goto err_free_mbuf; 75 if (unlikely(nsegs == 0)) { 76 bus_dmamap_unload(rq->dma_tag, rq->mbuf[ix].dma_map); 77 err = -ENOMEM; 78 goto err_free_mbuf; 79 } 80 wqe->data[0].addr = cpu_to_be64(segs[0].ds_addr); 81 wqe->data[0].byte_count = cpu_to_be32(segs[0].ds_len | 82 MLX5_HW_START_PADDING); 83 for (i = 1; i != nsegs; i++) { 84 wqe->data[i].addr = cpu_to_be64(segs[i].ds_addr); 85 wqe->data[i].byte_count = cpu_to_be32(segs[i].ds_len); 86 } 87 for (; i < rq->nsegs; i++) { 88 wqe->data[i].addr = 0; 89 wqe->data[i].byte_count = 0; 90 } 91 92 rq->mbuf[ix].mbuf = mb; 93 rq->mbuf[ix].data = mb->m_data; 94 95 bus_dmamap_sync(rq->dma_tag, rq->mbuf[ix].dma_map, 96 BUS_DMASYNC_PREREAD); 97 return (0); 98 99 err_free_mbuf: 100 m_freem(mb); 101 return (err); 102 } 103 104 static void 105 mlx5e_post_rx_wqes(struct mlx5e_rq *rq) 106 { 107 if (unlikely(rq->enabled == 0)) 108 return; 109 110 while (!mlx5_wq_ll_is_full(&rq->wq)) { 111 struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(&rq->wq, rq->wq.head); 112 113 if (unlikely(mlx5e_alloc_rx_wqe(rq, wqe, rq->wq.head))) { 114 callout_reset_curcpu(&rq->watchdog, 1, (void *)&mlx5e_post_rx_wqes, rq); 115 break; 116 } 117 mlx5_wq_ll_push(&rq->wq, be16_to_cpu(wqe->next.next_wqe_index)); 118 } 119 120 /* ensure wqes are visible to device before updating doorbell record */ 121 atomic_thread_fence_rel(); 122 123 mlx5_wq_ll_update_db_record(&rq->wq); 124 } 125 126 static void 127 mlx5e_lro_update_hdr(struct mbuf *mb, struct mlx5_cqe64 *cqe) 128 { 129 /* TODO: consider vlans, ip options, ... */ 130 struct ether_header *eh; 131 uint16_t eh_type; 132 uint16_t tot_len; 133 struct ip6_hdr *ip6 = NULL; 134 struct ip *ip4 = NULL; 135 struct tcphdr *th; 136 uint32_t *ts_ptr; 137 uint8_t l4_hdr_type; 138 int tcp_ack; 139 140 eh = mtod(mb, struct ether_header *); 141 eh_type = ntohs(eh->ether_type); 142 143 l4_hdr_type = get_cqe_l4_hdr_type(cqe); 144 tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA == l4_hdr_type) || 145 (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type)); 146 147 /* TODO: consider vlan */ 148 tot_len = be32_to_cpu(cqe->byte_cnt) - ETHER_HDR_LEN; 149 150 switch (eh_type) { 151 case ETHERTYPE_IP: 152 ip4 = (struct ip *)(eh + 1); 153 th = (struct tcphdr *)(ip4 + 1); 154 break; 155 case ETHERTYPE_IPV6: 156 ip6 = (struct ip6_hdr *)(eh + 1); 157 th = (struct tcphdr *)(ip6 + 1); 158 break; 159 default: 160 return; 161 } 162 163 ts_ptr = (uint32_t *)(th + 1); 164 165 if (get_cqe_lro_tcppsh(cqe)) 166 th->th_flags |= TH_PUSH; 167 168 if (tcp_ack) { 169 th->th_flags |= TH_ACK; 170 th->th_ack = cqe->lro_ack_seq_num; 171 th->th_win = cqe->lro_tcp_win; 172 173 /* 174 * FreeBSD handles only 32bit aligned timestamp right after 175 * the TCP hdr 176 * +--------+--------+--------+--------+ 177 * | NOP | NOP | TSopt | 10 | 178 * +--------+--------+--------+--------+ 179 * | TSval timestamp | 180 * +--------+--------+--------+--------+ 181 * | TSecr timestamp | 182 * +--------+--------+--------+--------+ 183 */ 184 if (get_cqe_lro_timestamp_valid(cqe) && 185 (__predict_true(*ts_ptr) == ntohl(TCPOPT_NOP << 24 | 186 TCPOPT_NOP << 16 | TCPOPT_TIMESTAMP << 8 | 187 TCPOLEN_TIMESTAMP))) { 188 /* 189 * cqe->timestamp is 64bit long. 190 * [0-31] - timestamp. 191 * [32-64] - timestamp echo replay. 192 */ 193 ts_ptr[1] = *(uint32_t *)&cqe->timestamp; 194 ts_ptr[2] = *((uint32_t *)&cqe->timestamp + 1); 195 } 196 } 197 if (ip4) { 198 ip4->ip_ttl = cqe->lro_min_ttl; 199 ip4->ip_len = cpu_to_be16(tot_len); 200 ip4->ip_sum = 0; 201 ip4->ip_sum = in_cksum(mb, ip4->ip_hl << 2); 202 } else { 203 ip6->ip6_hlim = cqe->lro_min_ttl; 204 ip6->ip6_plen = cpu_to_be16(tot_len - 205 sizeof(struct ip6_hdr)); 206 } 207 /* TODO: handle tcp checksum */ 208 } 209 210 static uint64_t 211 mlx5e_mbuf_tstmp(struct mlx5e_priv *priv, uint64_t hw_tstmp) 212 { 213 struct mlx5e_clbr_point *cp, dcp; 214 uint64_t a1, a2, res; 215 u_int gen; 216 217 do { 218 cp = &priv->clbr_points[priv->clbr_curr]; 219 gen = atomic_load_acq_int(&cp->clbr_gen); 220 if (gen == 0) 221 return (0); 222 dcp = *cp; 223 atomic_thread_fence_acq(); 224 } while (gen != cp->clbr_gen); 225 226 a1 = (hw_tstmp - dcp.clbr_hw_prev) >> MLX5E_TSTMP_PREC; 227 a2 = (dcp.base_curr - dcp.base_prev) >> MLX5E_TSTMP_PREC; 228 res = (a1 * a2) << MLX5E_TSTMP_PREC; 229 230 /* 231 * Divisor cannot be zero because calibration callback 232 * checks for the condition and disables timestamping 233 * if clock halted. 234 */ 235 res /= (dcp.clbr_hw_curr - dcp.clbr_hw_prev) >> MLX5E_TSTMP_PREC; 236 237 res += dcp.base_prev; 238 return (res); 239 } 240 241 static inline void 242 mlx5e_build_rx_mbuf(struct mlx5_cqe64 *cqe, 243 struct mlx5e_rq *rq, struct mbuf *mb, 244 u32 cqe_bcnt) 245 { 246 struct ifnet *ifp = rq->ifp; 247 struct mlx5e_channel *c; 248 struct mbuf *mb_head; 249 int lro_num_seg; /* HW LRO session aggregated packets counter */ 250 uint64_t tstmp; 251 252 lro_num_seg = be32_to_cpu(cqe->srqn) >> 24; 253 if (lro_num_seg > 1) { 254 mlx5e_lro_update_hdr(mb, cqe); 255 rq->stats.lro_packets++; 256 rq->stats.lro_bytes += cqe_bcnt; 257 } 258 259 mb->m_pkthdr.len = cqe_bcnt; 260 for (mb_head = mb; mb != NULL; mb = mb->m_next) { 261 if (mb->m_len > cqe_bcnt) 262 mb->m_len = cqe_bcnt; 263 cqe_bcnt -= mb->m_len; 264 if (likely(cqe_bcnt == 0)) { 265 if (likely(mb->m_next != NULL)) { 266 /* trim off empty mbufs */ 267 m_freem(mb->m_next); 268 mb->m_next = NULL; 269 } 270 break; 271 } 272 } 273 /* rewind to first mbuf in chain */ 274 mb = mb_head; 275 276 /* check if a Toeplitz hash was computed */ 277 if (cqe->rss_hash_type != 0) { 278 mb->m_pkthdr.flowid = be32_to_cpu(cqe->rss_hash_result); 279 #ifdef RSS 280 /* decode the RSS hash type */ 281 switch (cqe->rss_hash_type & 282 (CQE_RSS_DST_HTYPE_L4 | CQE_RSS_DST_HTYPE_IP)) { 283 /* IPv4 */ 284 case (CQE_RSS_DST_HTYPE_TCP | CQE_RSS_DST_HTYPE_IPV4): 285 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_TCP_IPV4); 286 break; 287 case (CQE_RSS_DST_HTYPE_UDP | CQE_RSS_DST_HTYPE_IPV4): 288 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_UDP_IPV4); 289 break; 290 case CQE_RSS_DST_HTYPE_IPV4: 291 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_IPV4); 292 break; 293 /* IPv6 */ 294 case (CQE_RSS_DST_HTYPE_TCP | CQE_RSS_DST_HTYPE_IPV6): 295 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_TCP_IPV6); 296 break; 297 case (CQE_RSS_DST_HTYPE_UDP | CQE_RSS_DST_HTYPE_IPV6): 298 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_UDP_IPV6); 299 break; 300 case CQE_RSS_DST_HTYPE_IPV6: 301 M_HASHTYPE_SET(mb, M_HASHTYPE_RSS_IPV6); 302 break; 303 default: /* Other */ 304 M_HASHTYPE_SET(mb, M_HASHTYPE_OPAQUE_HASH); 305 break; 306 } 307 #else 308 M_HASHTYPE_SET(mb, M_HASHTYPE_OPAQUE_HASH); 309 #endif 310 } else { 311 mb->m_pkthdr.flowid = rq->ix; 312 M_HASHTYPE_SET(mb, M_HASHTYPE_OPAQUE); 313 } 314 mb->m_pkthdr.rcvif = ifp; 315 316 if (likely(ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) && 317 ((cqe->hds_ip_ext & (CQE_L2_OK | CQE_L3_OK | CQE_L4_OK)) == 318 (CQE_L2_OK | CQE_L3_OK | CQE_L4_OK))) { 319 mb->m_pkthdr.csum_flags = 320 CSUM_IP_CHECKED | CSUM_IP_VALID | 321 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 322 mb->m_pkthdr.csum_data = htons(0xffff); 323 } else { 324 rq->stats.csum_none++; 325 } 326 327 if (cqe_has_vlan(cqe)) { 328 mb->m_pkthdr.ether_vtag = be16_to_cpu(cqe->vlan_info); 329 mb->m_flags |= M_VLANTAG; 330 } 331 332 c = container_of(rq, struct mlx5e_channel, rq); 333 if (c->priv->clbr_done >= 2) { 334 tstmp = mlx5e_mbuf_tstmp(c->priv, be64_to_cpu(cqe->timestamp)); 335 if ((tstmp & MLX5_CQE_TSTMP_PTP) != 0) { 336 /* 337 * Timestamp was taken on the packet entrance, 338 * instead of the cqe generation. 339 */ 340 tstmp &= ~MLX5_CQE_TSTMP_PTP; 341 mb->m_flags |= M_TSTMP_HPREC; 342 } 343 mb->m_pkthdr.rcv_tstmp = tstmp; 344 mb->m_flags |= M_TSTMP; 345 } 346 } 347 348 static inline void 349 mlx5e_read_cqe_slot(struct mlx5e_cq *cq, u32 cc, void *data) 350 { 351 memcpy(data, mlx5_cqwq_get_wqe(&cq->wq, (cc & cq->wq.sz_m1)), 352 sizeof(struct mlx5_cqe64)); 353 } 354 355 static inline void 356 mlx5e_write_cqe_slot(struct mlx5e_cq *cq, u32 cc, void *data) 357 { 358 memcpy(mlx5_cqwq_get_wqe(&cq->wq, cc & cq->wq.sz_m1), 359 data, sizeof(struct mlx5_cqe64)); 360 } 361 362 static inline void 363 mlx5e_decompress_cqe(struct mlx5e_cq *cq, struct mlx5_cqe64 *title, 364 struct mlx5_mini_cqe8 *mini, 365 u16 wqe_counter, int i) 366 { 367 /* 368 * NOTE: The fields which are not set here are copied from the 369 * initial and common title. See memcpy() in 370 * mlx5e_write_cqe_slot(). 371 */ 372 title->byte_cnt = mini->byte_cnt; 373 title->wqe_counter = cpu_to_be16((wqe_counter + i) & cq->wq.sz_m1); 374 title->rss_hash_result = mini->rx_hash_result; 375 /* 376 * Since we use MLX5_CQE_FORMAT_HASH when creating the RX CQ, 377 * the value of the checksum should be ignored. 378 */ 379 title->check_sum = 0; 380 title->op_own = (title->op_own & 0xf0) | 381 (((cq->wq.cc + i) >> cq->wq.log_sz) & 1); 382 } 383 384 #define MLX5E_MINI_ARRAY_SZ 8 385 /* Make sure structs are not packet differently */ 386 CTASSERT(sizeof(struct mlx5_cqe64) == 387 sizeof(struct mlx5_mini_cqe8) * MLX5E_MINI_ARRAY_SZ); 388 static void 389 mlx5e_decompress_cqes(struct mlx5e_cq *cq) 390 { 391 struct mlx5_mini_cqe8 mini_array[MLX5E_MINI_ARRAY_SZ]; 392 struct mlx5_cqe64 title; 393 u32 cqe_count; 394 u32 i = 0; 395 u16 title_wqe_counter; 396 397 mlx5e_read_cqe_slot(cq, cq->wq.cc, &title); 398 title_wqe_counter = be16_to_cpu(title.wqe_counter); 399 cqe_count = be32_to_cpu(title.byte_cnt); 400 401 /* Make sure we won't overflow */ 402 KASSERT(cqe_count <= cq->wq.sz_m1, 403 ("%s: cqe_count %u > cq->wq.sz_m1 %u", __func__, 404 cqe_count, cq->wq.sz_m1)); 405 406 mlx5e_read_cqe_slot(cq, cq->wq.cc + 1, mini_array); 407 while (true) { 408 mlx5e_decompress_cqe(cq, &title, 409 &mini_array[i % MLX5E_MINI_ARRAY_SZ], 410 title_wqe_counter, i); 411 mlx5e_write_cqe_slot(cq, cq->wq.cc + i, &title); 412 i++; 413 414 if (i == cqe_count) 415 break; 416 if (i % MLX5E_MINI_ARRAY_SZ == 0) 417 mlx5e_read_cqe_slot(cq, cq->wq.cc + i, mini_array); 418 } 419 } 420 421 static int 422 mlx5e_poll_rx_cq(struct mlx5e_rq *rq, int budget) 423 { 424 struct pfil_head *pfil; 425 int i, rv; 426 427 CURVNET_SET_QUIET(rq->ifp->if_vnet); 428 pfil = rq->channel->priv->pfil; 429 for (i = 0; i < budget; i++) { 430 struct mlx5e_rx_wqe *wqe; 431 struct mlx5_cqe64 *cqe; 432 struct mbuf *mb; 433 __be16 wqe_counter_be; 434 u16 wqe_counter; 435 u32 byte_cnt, seglen; 436 437 cqe = mlx5e_get_cqe(&rq->cq); 438 if (!cqe) 439 break; 440 441 if (mlx5_get_cqe_format(cqe) == MLX5_COMPRESSED) 442 mlx5e_decompress_cqes(&rq->cq); 443 444 mlx5_cqwq_pop(&rq->cq.wq); 445 446 wqe_counter_be = cqe->wqe_counter; 447 wqe_counter = be16_to_cpu(wqe_counter_be); 448 wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter); 449 byte_cnt = be32_to_cpu(cqe->byte_cnt); 450 451 bus_dmamap_sync(rq->dma_tag, 452 rq->mbuf[wqe_counter].dma_map, 453 BUS_DMASYNC_POSTREAD); 454 455 if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) { 456 rq->stats.wqe_err++; 457 goto wq_ll_pop; 458 } 459 if (pfil != NULL && PFIL_HOOKED_IN(pfil)) { 460 seglen = MIN(byte_cnt, MLX5E_MAX_RX_BYTES); 461 rv = pfil_run_hooks(rq->channel->priv->pfil, 462 rq->mbuf[wqe_counter].data, rq->ifp, 463 seglen | PFIL_MEMPTR | PFIL_IN, NULL); 464 465 switch (rv) { 466 case PFIL_DROPPED: 467 case PFIL_CONSUMED: 468 /* 469 * Filter dropped or consumed it. In 470 * either case, we can just recycle 471 * buffer; there is no more work to do. 472 */ 473 rq->stats.packets++; 474 goto wq_ll_pop; 475 case PFIL_REALLOCED: 476 /* 477 * Filter copied it; recycle buffer 478 * and receive the new mbuf allocated 479 * by the Filter 480 */ 481 mb = pfil_mem2mbuf(rq->mbuf[wqe_counter].data); 482 goto rx_common; 483 default: 484 /* 485 * The Filter said it was OK, so 486 * receive like normal. 487 */ 488 KASSERT(rv == PFIL_PASS, 489 ("Filter returned %d!\n", rv)); 490 } 491 } 492 if ((MHLEN - MLX5E_NET_IP_ALIGN) >= byte_cnt && 493 (mb = m_gethdr(M_NOWAIT, MT_DATA)) != NULL) { 494 /* set maximum mbuf length */ 495 mb->m_len = MHLEN - MLX5E_NET_IP_ALIGN; 496 /* get IP header aligned */ 497 mb->m_data += MLX5E_NET_IP_ALIGN; 498 499 bcopy(rq->mbuf[wqe_counter].data, mtod(mb, caddr_t), 500 byte_cnt); 501 } else { 502 mb = rq->mbuf[wqe_counter].mbuf; 503 rq->mbuf[wqe_counter].mbuf = NULL; /* safety clear */ 504 505 bus_dmamap_unload(rq->dma_tag, 506 rq->mbuf[wqe_counter].dma_map); 507 } 508 rx_common: 509 mlx5e_build_rx_mbuf(cqe, rq, mb, byte_cnt); 510 rq->stats.bytes += byte_cnt; 511 rq->stats.packets++; 512 #ifdef NUMA 513 mb->m_pkthdr.numa_domain = rq->ifp->if_numa_domain; 514 #endif 515 516 #if !defined(HAVE_TCP_LRO_RX) 517 tcp_lro_queue_mbuf(&rq->lro, mb); 518 #else 519 if (mb->m_pkthdr.csum_flags == 0 || 520 (rq->ifp->if_capenable & IFCAP_LRO) == 0 || 521 rq->lro.lro_cnt == 0 || 522 tcp_lro_rx(&rq->lro, mb, 0) != 0) { 523 rq->ifp->if_input(rq->ifp, mb); 524 } 525 #endif 526 wq_ll_pop: 527 mlx5_wq_ll_pop(&rq->wq, wqe_counter_be, 528 &wqe->next.next_wqe_index); 529 } 530 CURVNET_RESTORE(); 531 532 mlx5_cqwq_update_db_record(&rq->cq.wq); 533 534 /* ensure cq space is freed before enabling more cqes */ 535 atomic_thread_fence_rel(); 536 return (i); 537 } 538 539 void 540 mlx5e_rx_cq_comp(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe __unused) 541 { 542 struct mlx5e_rq *rq = container_of(mcq, struct mlx5e_rq, cq.mcq); 543 int i = 0; 544 545 #ifdef HAVE_PER_CQ_EVENT_PACKET 546 #if (MHLEN < 15) 547 #error "MHLEN is too small" 548 #endif 549 struct mbuf *mb = m_gethdr(M_NOWAIT, MT_DATA); 550 551 if (mb != NULL) { 552 /* this code is used for debugging purpose only */ 553 mb->m_pkthdr.len = mb->m_len = 15; 554 memset(mb->m_data, 255, 14); 555 mb->m_data[14] = rq->ix; 556 mb->m_pkthdr.rcvif = rq->ifp; 557 rq->ifp->if_input(rq->ifp, mb); 558 } 559 #endif 560 561 mtx_lock(&rq->mtx); 562 563 /* 564 * Polling the entire CQ without posting new WQEs results in 565 * lack of receive WQEs during heavy traffic scenarios. 566 */ 567 while (1) { 568 if (mlx5e_poll_rx_cq(rq, MLX5E_RX_BUDGET_MAX) != 569 MLX5E_RX_BUDGET_MAX) 570 break; 571 i += MLX5E_RX_BUDGET_MAX; 572 if (i >= MLX5E_BUDGET_MAX) 573 break; 574 mlx5e_post_rx_wqes(rq); 575 } 576 mlx5e_post_rx_wqes(rq); 577 /* check for dynamic interrupt moderation callback */ 578 if (rq->dim.mode != NET_DIM_CQ_PERIOD_MODE_DISABLED) 579 net_dim(&rq->dim, rq->stats.packets, rq->stats.bytes); 580 mlx5e_cq_arm(&rq->cq, MLX5_GET_DOORBELL_LOCK(&rq->channel->priv->doorbell_lock)); 581 tcp_lro_flush_all(&rq->lro); 582 mtx_unlock(&rq->mtx); 583 } 584