1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #include <stdint.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <errno.h> 10 11 #include <rte_cycles.h> 12 #include <rte_memory.h> 13 #include <rte_branch_prediction.h> 14 #include <rte_mempool.h> 15 #include <rte_malloc.h> 16 #include <rte_mbuf.h> 17 #include <rte_ether.h> 18 #include <rte_ethdev_driver.h> 19 #include <rte_prefetch.h> 20 #include <rte_string_fns.h> 21 #include <rte_errno.h> 22 #include <rte_byteorder.h> 23 #include <rte_net.h> 24 #include <rte_ip.h> 25 #include <rte_udp.h> 26 #include <rte_tcp.h> 27 28 #include "virtio_logs.h" 29 #include "virtio_ethdev.h" 30 #include "virtio_pci.h" 31 #include "virtqueue.h" 32 #include "virtio_rxtx.h" 33 #include "virtio_rxtx_simple.h" 34 35 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP 36 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len) 37 #else 38 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0) 39 #endif 40 41 int 42 virtio_dev_rx_queue_done(void *rxq, uint16_t offset) 43 { 44 struct virtnet_rx *rxvq = rxq; 45 struct virtqueue *vq = rxvq->vq; 46 47 return VIRTQUEUE_NUSED(vq) >= offset; 48 } 49 50 void 51 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num) 52 { 53 vq->vq_free_cnt += num; 54 vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1); 55 } 56 57 void 58 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) 59 { 60 struct vring_desc *dp, *dp_tail; 61 struct vq_desc_extra *dxp; 62 uint16_t desc_idx_last = desc_idx; 63 64 dp = &vq->vq_ring.desc[desc_idx]; 65 dxp = &vq->vq_descx[desc_idx]; 66 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs); 67 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) { 68 while (dp->flags & VRING_DESC_F_NEXT) { 69 desc_idx_last = dp->next; 70 dp = &vq->vq_ring.desc[dp->next]; 71 } 72 } 73 dxp->ndescs = 0; 74 75 /* 76 * We must append the existing free chain, if any, to the end of 77 * newly freed chain. If the virtqueue was completely used, then 78 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above). 79 */ 80 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) { 81 vq->vq_desc_head_idx = desc_idx; 82 } else { 83 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx]; 84 dp_tail->next = desc_idx; 85 } 86 87 vq->vq_desc_tail_idx = desc_idx_last; 88 dp->next = VQ_RING_DESC_CHAIN_END; 89 } 90 91 static uint16_t 92 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, 93 uint32_t *len, uint16_t num) 94 { 95 struct vring_used_elem *uep; 96 struct rte_mbuf *cookie; 97 uint16_t used_idx, desc_idx; 98 uint16_t i; 99 100 /* Caller does the check */ 101 for (i = 0; i < num ; i++) { 102 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 103 uep = &vq->vq_ring.used->ring[used_idx]; 104 desc_idx = (uint16_t) uep->id; 105 len[i] = uep->len; 106 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie; 107 108 if (unlikely(cookie == NULL)) { 109 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u", 110 vq->vq_used_cons_idx); 111 break; 112 } 113 114 rte_prefetch0(cookie); 115 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); 116 rx_pkts[i] = cookie; 117 vq->vq_used_cons_idx++; 118 vq_ring_free_chain(vq, desc_idx); 119 vq->vq_descx[desc_idx].cookie = NULL; 120 } 121 122 return i; 123 } 124 125 static uint16_t 126 virtqueue_dequeue_rx_inorder(struct virtqueue *vq, 127 struct rte_mbuf **rx_pkts, 128 uint32_t *len, 129 uint16_t num) 130 { 131 struct vring_used_elem *uep; 132 struct rte_mbuf *cookie; 133 uint16_t used_idx = 0; 134 uint16_t i; 135 136 if (unlikely(num == 0)) 137 return 0; 138 139 for (i = 0; i < num; i++) { 140 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); 141 /* Desc idx same as used idx */ 142 uep = &vq->vq_ring.used->ring[used_idx]; 143 len[i] = uep->len; 144 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie; 145 146 if (unlikely(cookie == NULL)) { 147 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u", 148 vq->vq_used_cons_idx); 149 break; 150 } 151 152 rte_prefetch0(cookie); 153 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); 154 rx_pkts[i] = cookie; 155 vq->vq_used_cons_idx++; 156 vq->vq_descx[used_idx].cookie = NULL; 157 } 158 159 vq_ring_free_inorder(vq, used_idx, i); 160 return i; 161 } 162 163 #ifndef DEFAULT_TX_FREE_THRESH 164 #define DEFAULT_TX_FREE_THRESH 32 165 #endif 166 167 /* Cleanup from completed transmits. */ 168 static void 169 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) 170 { 171 uint16_t i, used_idx, desc_idx; 172 for (i = 0; i < num; i++) { 173 struct vring_used_elem *uep; 174 struct vq_desc_extra *dxp; 175 176 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 177 uep = &vq->vq_ring.used->ring[used_idx]; 178 179 desc_idx = (uint16_t) uep->id; 180 dxp = &vq->vq_descx[desc_idx]; 181 vq->vq_used_cons_idx++; 182 vq_ring_free_chain(vq, desc_idx); 183 184 if (dxp->cookie != NULL) { 185 rte_pktmbuf_free(dxp->cookie); 186 dxp->cookie = NULL; 187 } 188 } 189 } 190 191 /* Cleanup from completed inorder transmits. */ 192 static void 193 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num) 194 { 195 uint16_t i, used_idx, desc_idx = 0, last_idx; 196 int16_t free_cnt = 0; 197 struct vq_desc_extra *dxp = NULL; 198 199 if (unlikely(num == 0)) 200 return; 201 202 for (i = 0; i < num; i++) { 203 struct vring_used_elem *uep; 204 205 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); 206 uep = &vq->vq_ring.used->ring[used_idx]; 207 desc_idx = (uint16_t)uep->id; 208 209 dxp = &vq->vq_descx[desc_idx]; 210 vq->vq_used_cons_idx++; 211 212 if (dxp->cookie != NULL) { 213 rte_pktmbuf_free(dxp->cookie); 214 dxp->cookie = NULL; 215 } 216 } 217 218 last_idx = desc_idx + dxp->ndescs - 1; 219 free_cnt = last_idx - vq->vq_desc_tail_idx; 220 if (free_cnt <= 0) 221 free_cnt += vq->vq_nentries; 222 223 vq_ring_free_inorder(vq, last_idx, free_cnt); 224 } 225 226 static inline int 227 virtqueue_enqueue_refill_inorder(struct virtqueue *vq, 228 struct rte_mbuf **cookies, 229 uint16_t num) 230 { 231 struct vq_desc_extra *dxp; 232 struct virtio_hw *hw = vq->hw; 233 struct vring_desc *start_dp; 234 uint16_t head_idx, idx, i = 0; 235 236 if (unlikely(vq->vq_free_cnt == 0)) 237 return -ENOSPC; 238 if (unlikely(vq->vq_free_cnt < num)) 239 return -EMSGSIZE; 240 241 head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1); 242 start_dp = vq->vq_ring.desc; 243 244 while (i < num) { 245 idx = head_idx & (vq->vq_nentries - 1); 246 dxp = &vq->vq_descx[idx]; 247 dxp->cookie = (void *)cookies[i]; 248 dxp->ndescs = 1; 249 250 start_dp[idx].addr = 251 VIRTIO_MBUF_ADDR(cookies[i], vq) + 252 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size; 253 start_dp[idx].len = 254 cookies[i]->buf_len - 255 RTE_PKTMBUF_HEADROOM + 256 hw->vtnet_hdr_size; 257 start_dp[idx].flags = VRING_DESC_F_WRITE; 258 259 vq_update_avail_ring(vq, idx); 260 head_idx++; 261 i++; 262 } 263 264 vq->vq_desc_head_idx += num; 265 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num); 266 return 0; 267 } 268 269 static inline int 270 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) 271 { 272 struct vq_desc_extra *dxp; 273 struct virtio_hw *hw = vq->hw; 274 struct vring_desc *start_dp; 275 uint16_t needed = 1; 276 uint16_t head_idx, idx; 277 278 if (unlikely(vq->vq_free_cnt == 0)) 279 return -ENOSPC; 280 if (unlikely(vq->vq_free_cnt < needed)) 281 return -EMSGSIZE; 282 283 head_idx = vq->vq_desc_head_idx; 284 if (unlikely(head_idx >= vq->vq_nentries)) 285 return -EFAULT; 286 287 idx = head_idx; 288 dxp = &vq->vq_descx[idx]; 289 dxp->cookie = (void *)cookie; 290 dxp->ndescs = needed; 291 292 start_dp = vq->vq_ring.desc; 293 start_dp[idx].addr = 294 VIRTIO_MBUF_ADDR(cookie, vq) + 295 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size; 296 start_dp[idx].len = 297 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size; 298 start_dp[idx].flags = VRING_DESC_F_WRITE; 299 idx = start_dp[idx].next; 300 vq->vq_desc_head_idx = idx; 301 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 302 vq->vq_desc_tail_idx = idx; 303 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 304 vq_update_avail_ring(vq, head_idx); 305 306 return 0; 307 } 308 309 /* When doing TSO, the IP length is not included in the pseudo header 310 * checksum of the packet given to the PMD, but for virtio it is 311 * expected. 312 */ 313 static void 314 virtio_tso_fix_cksum(struct rte_mbuf *m) 315 { 316 /* common case: header is not fragmented */ 317 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len + 318 m->l4_len)) { 319 struct ipv4_hdr *iph; 320 struct ipv6_hdr *ip6h; 321 struct tcp_hdr *th; 322 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen; 323 uint32_t tmp; 324 325 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len); 326 th = RTE_PTR_ADD(iph, m->l3_len); 327 if ((iph->version_ihl >> 4) == 4) { 328 iph->hdr_checksum = 0; 329 iph->hdr_checksum = rte_ipv4_cksum(iph); 330 ip_len = iph->total_length; 331 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) - 332 m->l3_len); 333 } else { 334 ip6h = (struct ipv6_hdr *)iph; 335 ip_paylen = ip6h->payload_len; 336 } 337 338 /* calculate the new phdr checksum not including ip_paylen */ 339 prev_cksum = th->cksum; 340 tmp = prev_cksum; 341 tmp += ip_paylen; 342 tmp = (tmp & 0xffff) + (tmp >> 16); 343 new_cksum = tmp; 344 345 /* replace it in the packet */ 346 th->cksum = new_cksum; 347 } 348 } 349 350 351 /* avoid write operation when necessary, to lessen cache issues */ 352 #define ASSIGN_UNLESS_EQUAL(var, val) do { \ 353 if ((var) != (val)) \ 354 (var) = (val); \ 355 } while (0) 356 357 static inline void 358 virtqueue_xmit_offload(struct virtio_net_hdr *hdr, 359 struct rte_mbuf *cookie, 360 bool offload) 361 { 362 if (offload) { 363 if (cookie->ol_flags & PKT_TX_TCP_SEG) 364 cookie->ol_flags |= PKT_TX_TCP_CKSUM; 365 366 switch (cookie->ol_flags & PKT_TX_L4_MASK) { 367 case PKT_TX_UDP_CKSUM: 368 hdr->csum_start = cookie->l2_len + cookie->l3_len; 369 hdr->csum_offset = offsetof(struct udp_hdr, 370 dgram_cksum); 371 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 372 break; 373 374 case PKT_TX_TCP_CKSUM: 375 hdr->csum_start = cookie->l2_len + cookie->l3_len; 376 hdr->csum_offset = offsetof(struct tcp_hdr, cksum); 377 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 378 break; 379 380 default: 381 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); 382 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); 383 ASSIGN_UNLESS_EQUAL(hdr->flags, 0); 384 break; 385 } 386 387 /* TCP Segmentation Offload */ 388 if (cookie->ol_flags & PKT_TX_TCP_SEG) { 389 virtio_tso_fix_cksum(cookie); 390 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ? 391 VIRTIO_NET_HDR_GSO_TCPV6 : 392 VIRTIO_NET_HDR_GSO_TCPV4; 393 hdr->gso_size = cookie->tso_segsz; 394 hdr->hdr_len = 395 cookie->l2_len + 396 cookie->l3_len + 397 cookie->l4_len; 398 } else { 399 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); 400 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); 401 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); 402 } 403 } 404 } 405 406 static inline void 407 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq, 408 struct rte_mbuf **cookies, 409 uint16_t num) 410 { 411 struct vq_desc_extra *dxp; 412 struct virtqueue *vq = txvq->vq; 413 struct vring_desc *start_dp; 414 struct virtio_net_hdr *hdr; 415 uint16_t idx; 416 uint16_t head_size = vq->hw->vtnet_hdr_size; 417 uint16_t i = 0; 418 419 idx = vq->vq_desc_head_idx; 420 start_dp = vq->vq_ring.desc; 421 422 while (i < num) { 423 idx = idx & (vq->vq_nentries - 1); 424 dxp = &vq->vq_descx[idx]; 425 dxp->cookie = (void *)cookies[i]; 426 dxp->ndescs = 1; 427 428 hdr = (struct virtio_net_hdr *) 429 rte_pktmbuf_prepend(cookies[i], head_size); 430 cookies[i]->pkt_len -= head_size; 431 432 /* if offload disabled, it is not zeroed below, do it now */ 433 if (!vq->hw->has_tx_offload) { 434 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); 435 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); 436 ASSIGN_UNLESS_EQUAL(hdr->flags, 0); 437 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); 438 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); 439 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); 440 } 441 442 virtqueue_xmit_offload(hdr, cookies[i], 443 vq->hw->has_tx_offload); 444 445 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq); 446 start_dp[idx].len = cookies[i]->data_len; 447 start_dp[idx].flags = 0; 448 449 vq_update_avail_ring(vq, idx); 450 451 idx++; 452 i++; 453 }; 454 455 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num); 456 vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1); 457 } 458 459 static inline void 460 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, 461 uint16_t needed, int use_indirect, int can_push, 462 int in_order) 463 { 464 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; 465 struct vq_desc_extra *dxp; 466 struct virtqueue *vq = txvq->vq; 467 struct vring_desc *start_dp; 468 uint16_t seg_num = cookie->nb_segs; 469 uint16_t head_idx, idx; 470 uint16_t head_size = vq->hw->vtnet_hdr_size; 471 struct virtio_net_hdr *hdr; 472 473 head_idx = vq->vq_desc_head_idx; 474 idx = head_idx; 475 dxp = &vq->vq_descx[idx]; 476 dxp->cookie = (void *)cookie; 477 dxp->ndescs = needed; 478 479 start_dp = vq->vq_ring.desc; 480 481 if (can_push) { 482 /* prepend cannot fail, checked by caller */ 483 hdr = (struct virtio_net_hdr *) 484 rte_pktmbuf_prepend(cookie, head_size); 485 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length, 486 * which is wrong. Below subtract restores correct pkt size. 487 */ 488 cookie->pkt_len -= head_size; 489 490 /* if offload disabled, it is not zeroed below, do it now */ 491 if (!vq->hw->has_tx_offload) { 492 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); 493 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); 494 ASSIGN_UNLESS_EQUAL(hdr->flags, 0); 495 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); 496 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); 497 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); 498 } 499 } else if (use_indirect) { 500 /* setup tx ring slot to point to indirect 501 * descriptor list stored in reserved region. 502 * 503 * the first slot in indirect ring is already preset 504 * to point to the header in reserved region 505 */ 506 start_dp[idx].addr = txvq->virtio_net_hdr_mem + 507 RTE_PTR_DIFF(&txr[idx].tx_indir, txr); 508 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc); 509 start_dp[idx].flags = VRING_DESC_F_INDIRECT; 510 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr; 511 512 /* loop below will fill in rest of the indirect elements */ 513 start_dp = txr[idx].tx_indir; 514 idx = 1; 515 } else { 516 /* setup first tx ring slot to point to header 517 * stored in reserved region. 518 */ 519 start_dp[idx].addr = txvq->virtio_net_hdr_mem + 520 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr); 521 start_dp[idx].len = vq->hw->vtnet_hdr_size; 522 start_dp[idx].flags = VRING_DESC_F_NEXT; 523 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr; 524 525 idx = start_dp[idx].next; 526 } 527 528 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload); 529 530 do { 531 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); 532 start_dp[idx].len = cookie->data_len; 533 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0; 534 idx = start_dp[idx].next; 535 } while ((cookie = cookie->next) != NULL); 536 537 if (use_indirect) 538 idx = vq->vq_ring.desc[head_idx].next; 539 540 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 541 542 vq->vq_desc_head_idx = idx; 543 vq_update_avail_ring(vq, head_idx); 544 545 if (!in_order) { 546 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 547 vq->vq_desc_tail_idx = idx; 548 } 549 } 550 551 void 552 virtio_dev_cq_start(struct rte_eth_dev *dev) 553 { 554 struct virtio_hw *hw = dev->data->dev_private; 555 556 if (hw->cvq && hw->cvq->vq) { 557 rte_spinlock_init(&hw->cvq->lock); 558 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq); 559 } 560 } 561 562 int 563 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, 564 uint16_t queue_idx, 565 uint16_t nb_desc, 566 unsigned int socket_id __rte_unused, 567 const struct rte_eth_rxconf *rx_conf __rte_unused, 568 struct rte_mempool *mp) 569 { 570 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 571 struct virtio_hw *hw = dev->data->dev_private; 572 struct virtqueue *vq = hw->vqs[vtpci_queue_idx]; 573 struct virtnet_rx *rxvq; 574 575 PMD_INIT_FUNC_TRACE(); 576 577 if (nb_desc == 0 || nb_desc > vq->vq_nentries) 578 nb_desc = vq->vq_nentries; 579 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc); 580 581 rxvq = &vq->rxq; 582 rxvq->queue_id = queue_idx; 583 rxvq->mpool = mp; 584 if (rxvq->mpool == NULL) { 585 rte_exit(EXIT_FAILURE, 586 "Cannot allocate mbufs for rx virtqueue"); 587 } 588 589 dev->data->rx_queues[queue_idx] = rxvq; 590 591 return 0; 592 } 593 594 int 595 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx) 596 { 597 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 598 struct virtio_hw *hw = dev->data->dev_private; 599 struct virtqueue *vq = hw->vqs[vtpci_queue_idx]; 600 struct virtnet_rx *rxvq = &vq->rxq; 601 struct rte_mbuf *m; 602 uint16_t desc_idx; 603 int error, nbufs, i; 604 605 PMD_INIT_FUNC_TRACE(); 606 607 /* Allocate blank mbufs for the each rx descriptor */ 608 nbufs = 0; 609 610 if (hw->use_simple_rx) { 611 for (desc_idx = 0; desc_idx < vq->vq_nentries; 612 desc_idx++) { 613 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 614 vq->vq_ring.desc[desc_idx].flags = 615 VRING_DESC_F_WRITE; 616 } 617 618 virtio_rxq_vec_setup(rxvq); 619 } 620 621 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf)); 622 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; 623 desc_idx++) { 624 vq->sw_ring[vq->vq_nentries + desc_idx] = 625 &rxvq->fake_mbuf; 626 } 627 628 if (hw->use_simple_rx) { 629 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { 630 virtio_rxq_rearm_vec(rxvq); 631 nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH; 632 } 633 } else if (hw->use_inorder_rx) { 634 if ((!virtqueue_full(vq))) { 635 uint16_t free_cnt = vq->vq_free_cnt; 636 struct rte_mbuf *pkts[free_cnt]; 637 638 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts, 639 free_cnt)) { 640 error = virtqueue_enqueue_refill_inorder(vq, 641 pkts, 642 free_cnt); 643 if (unlikely(error)) { 644 for (i = 0; i < free_cnt; i++) 645 rte_pktmbuf_free(pkts[i]); 646 } 647 } 648 649 nbufs += free_cnt; 650 vq_update_avail_idx(vq); 651 } 652 } else { 653 while (!virtqueue_full(vq)) { 654 m = rte_mbuf_raw_alloc(rxvq->mpool); 655 if (m == NULL) 656 break; 657 658 /* Enqueue allocated buffers */ 659 error = virtqueue_enqueue_recv_refill(vq, m); 660 if (error) { 661 rte_pktmbuf_free(m); 662 break; 663 } 664 nbufs++; 665 } 666 667 vq_update_avail_idx(vq); 668 } 669 670 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 671 672 VIRTQUEUE_DUMP(vq); 673 674 return 0; 675 } 676 677 /* 678 * struct rte_eth_dev *dev: Used to update dev 679 * uint16_t nb_desc: Defaults to values read from config space 680 * unsigned int socket_id: Used to allocate memzone 681 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 682 * uint16_t queue_idx: Just used as an index in dev txq list 683 */ 684 int 685 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 686 uint16_t queue_idx, 687 uint16_t nb_desc, 688 unsigned int socket_id __rte_unused, 689 const struct rte_eth_txconf *tx_conf) 690 { 691 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 692 struct virtio_hw *hw = dev->data->dev_private; 693 struct virtqueue *vq = hw->vqs[vtpci_queue_idx]; 694 struct virtnet_tx *txvq; 695 uint16_t tx_free_thresh; 696 697 PMD_INIT_FUNC_TRACE(); 698 699 if (nb_desc == 0 || nb_desc > vq->vq_nentries) 700 nb_desc = vq->vq_nentries; 701 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc); 702 703 txvq = &vq->txq; 704 txvq->queue_id = queue_idx; 705 706 tx_free_thresh = tx_conf->tx_free_thresh; 707 if (tx_free_thresh == 0) 708 tx_free_thresh = 709 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 710 711 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 712 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 713 "number of TX entries minus 3 (%u)." 714 " (tx_free_thresh=%u port=%u queue=%u)\n", 715 vq->vq_nentries - 3, 716 tx_free_thresh, dev->data->port_id, queue_idx); 717 return -EINVAL; 718 } 719 720 vq->vq_free_thresh = tx_free_thresh; 721 722 dev->data->tx_queues[queue_idx] = txvq; 723 return 0; 724 } 725 726 int 727 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev, 728 uint16_t queue_idx) 729 { 730 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 731 struct virtio_hw *hw = dev->data->dev_private; 732 struct virtqueue *vq = hw->vqs[vtpci_queue_idx]; 733 734 PMD_INIT_FUNC_TRACE(); 735 736 if (hw->use_inorder_tx) 737 vq->vq_ring.desc[vq->vq_nentries - 1].next = 0; 738 739 VIRTQUEUE_DUMP(vq); 740 741 return 0; 742 } 743 744 static void 745 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 746 { 747 int error; 748 /* 749 * Requeue the discarded mbuf. This should always be 750 * successful since it was just dequeued. 751 */ 752 error = virtqueue_enqueue_recv_refill(vq, m); 753 754 if (unlikely(error)) { 755 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 756 rte_pktmbuf_free(m); 757 } 758 } 759 760 static void 761 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m) 762 { 763 int error; 764 765 error = virtqueue_enqueue_refill_inorder(vq, &m, 1); 766 if (unlikely(error)) { 767 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 768 rte_pktmbuf_free(m); 769 } 770 } 771 772 static void 773 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf) 774 { 775 uint32_t s = mbuf->pkt_len; 776 struct ether_addr *ea; 777 778 stats->bytes += s; 779 780 if (s == 64) { 781 stats->size_bins[1]++; 782 } else if (s > 64 && s < 1024) { 783 uint32_t bin; 784 785 /* count zeros, and offset into correct bin */ 786 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 787 stats->size_bins[bin]++; 788 } else { 789 if (s < 64) 790 stats->size_bins[0]++; 791 else if (s < 1519) 792 stats->size_bins[6]++; 793 else if (s >= 1519) 794 stats->size_bins[7]++; 795 } 796 797 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 798 if (is_multicast_ether_addr(ea)) { 799 if (is_broadcast_ether_addr(ea)) 800 stats->broadcast++; 801 else 802 stats->multicast++; 803 } 804 } 805 806 static inline void 807 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m) 808 { 809 VIRTIO_DUMP_PACKET(m, m->data_len); 810 811 virtio_update_packet_stats(&rxvq->stats, m); 812 } 813 814 /* Optionally fill offload information in structure */ 815 static int 816 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr) 817 { 818 struct rte_net_hdr_lens hdr_lens; 819 uint32_t hdrlen, ptype; 820 int l4_supported = 0; 821 822 /* nothing to do */ 823 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE) 824 return 0; 825 826 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN; 827 828 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK); 829 m->packet_type = ptype; 830 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP || 831 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP || 832 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP) 833 l4_supported = 1; 834 835 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 836 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len; 837 if (hdr->csum_start <= hdrlen && l4_supported) { 838 m->ol_flags |= PKT_RX_L4_CKSUM_NONE; 839 } else { 840 /* Unknown proto or tunnel, do sw cksum. We can assume 841 * the cksum field is in the first segment since the 842 * buffers we provided to the host are large enough. 843 * In case of SCTP, this will be wrong since it's a CRC 844 * but there's nothing we can do. 845 */ 846 uint16_t csum = 0, off; 847 848 rte_raw_cksum_mbuf(m, hdr->csum_start, 849 rte_pktmbuf_pkt_len(m) - hdr->csum_start, 850 &csum); 851 if (likely(csum != 0xffff)) 852 csum = ~csum; 853 off = hdr->csum_offset + hdr->csum_start; 854 if (rte_pktmbuf_data_len(m) >= off + 1) 855 *rte_pktmbuf_mtod_offset(m, uint16_t *, 856 off) = csum; 857 } 858 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) { 859 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD; 860 } 861 862 /* GSO request, save required information in mbuf */ 863 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { 864 /* Check unsupported modes */ 865 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) || 866 (hdr->gso_size == 0)) { 867 return -EINVAL; 868 } 869 870 /* Update mss lengthes in mbuf */ 871 m->tso_segsz = hdr->gso_size; 872 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 873 case VIRTIO_NET_HDR_GSO_TCPV4: 874 case VIRTIO_NET_HDR_GSO_TCPV6: 875 m->ol_flags |= PKT_RX_LRO | \ 876 PKT_RX_L4_CKSUM_NONE; 877 break; 878 default: 879 return -EINVAL; 880 } 881 } 882 883 return 0; 884 } 885 886 #define VIRTIO_MBUF_BURST_SZ 64 887 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 888 uint16_t 889 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 890 { 891 struct virtnet_rx *rxvq = rx_queue; 892 struct virtqueue *vq = rxvq->vq; 893 struct virtio_hw *hw = vq->hw; 894 struct rte_mbuf *rxm, *new_mbuf; 895 uint16_t nb_used, num, nb_rx; 896 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 897 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 898 int error; 899 uint32_t i, nb_enqueued; 900 uint32_t hdr_size; 901 struct virtio_net_hdr *hdr; 902 903 nb_rx = 0; 904 if (unlikely(hw->started == 0)) 905 return nb_rx; 906 907 nb_used = VIRTQUEUE_NUSED(vq); 908 909 virtio_rmb(); 910 911 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts; 912 if (unlikely(num > VIRTIO_MBUF_BURST_SZ)) 913 num = VIRTIO_MBUF_BURST_SZ; 914 if (likely(num > DESC_PER_CACHELINE)) 915 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 916 917 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num); 918 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 919 920 nb_enqueued = 0; 921 hdr_size = hw->vtnet_hdr_size; 922 923 for (i = 0; i < num ; i++) { 924 rxm = rcv_pkts[i]; 925 926 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 927 928 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 929 PMD_RX_LOG(ERR, "Packet drop"); 930 nb_enqueued++; 931 virtio_discard_rxbuf(vq, rxm); 932 rxvq->stats.errors++; 933 continue; 934 } 935 936 rxm->port = rxvq->port_id; 937 rxm->data_off = RTE_PKTMBUF_HEADROOM; 938 rxm->ol_flags = 0; 939 rxm->vlan_tci = 0; 940 941 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 942 rxm->data_len = (uint16_t)(len[i] - hdr_size); 943 944 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr + 945 RTE_PKTMBUF_HEADROOM - hdr_size); 946 947 if (hw->vlan_strip) 948 rte_vlan_strip(rxm); 949 950 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) { 951 virtio_discard_rxbuf(vq, rxm); 952 rxvq->stats.errors++; 953 continue; 954 } 955 956 virtio_rx_stats_updated(rxvq, rxm); 957 958 rx_pkts[nb_rx++] = rxm; 959 } 960 961 rxvq->stats.packets += nb_rx; 962 963 /* Allocate new mbuf for the used descriptor */ 964 while (likely(!virtqueue_full(vq))) { 965 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 966 if (unlikely(new_mbuf == NULL)) { 967 struct rte_eth_dev *dev 968 = &rte_eth_devices[rxvq->port_id]; 969 dev->data->rx_mbuf_alloc_failed++; 970 break; 971 } 972 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 973 if (unlikely(error)) { 974 rte_pktmbuf_free(new_mbuf); 975 break; 976 } 977 nb_enqueued++; 978 } 979 980 if (likely(nb_enqueued)) { 981 vq_update_avail_idx(vq); 982 983 if (unlikely(virtqueue_kick_prepare(vq))) { 984 virtqueue_notify(vq); 985 PMD_RX_LOG(DEBUG, "Notified"); 986 } 987 } 988 989 return nb_rx; 990 } 991 992 uint16_t 993 virtio_recv_mergeable_pkts_inorder(void *rx_queue, 994 struct rte_mbuf **rx_pkts, 995 uint16_t nb_pkts) 996 { 997 struct virtnet_rx *rxvq = rx_queue; 998 struct virtqueue *vq = rxvq->vq; 999 struct virtio_hw *hw = vq->hw; 1000 struct rte_mbuf *rxm; 1001 struct rte_mbuf *prev; 1002 uint16_t nb_used, num, nb_rx; 1003 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 1004 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 1005 int error; 1006 uint32_t nb_enqueued; 1007 uint32_t seg_num; 1008 uint32_t seg_res; 1009 uint32_t hdr_size; 1010 int32_t i; 1011 1012 nb_rx = 0; 1013 if (unlikely(hw->started == 0)) 1014 return nb_rx; 1015 1016 nb_used = VIRTQUEUE_NUSED(vq); 1017 nb_used = RTE_MIN(nb_used, nb_pkts); 1018 nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ); 1019 1020 virtio_rmb(); 1021 1022 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 1023 1024 nb_enqueued = 0; 1025 seg_num = 1; 1026 seg_res = 0; 1027 hdr_size = hw->vtnet_hdr_size; 1028 1029 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used); 1030 1031 for (i = 0; i < num; i++) { 1032 struct virtio_net_hdr_mrg_rxbuf *header; 1033 1034 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 1035 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 1036 1037 rxm = rcv_pkts[i]; 1038 1039 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 1040 PMD_RX_LOG(ERR, "Packet drop"); 1041 nb_enqueued++; 1042 virtio_discard_rxbuf_inorder(vq, rxm); 1043 rxvq->stats.errors++; 1044 continue; 1045 } 1046 1047 header = (struct virtio_net_hdr_mrg_rxbuf *) 1048 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM 1049 - hdr_size); 1050 seg_num = header->num_buffers; 1051 1052 if (seg_num == 0) 1053 seg_num = 1; 1054 1055 rxm->data_off = RTE_PKTMBUF_HEADROOM; 1056 rxm->nb_segs = seg_num; 1057 rxm->ol_flags = 0; 1058 rxm->vlan_tci = 0; 1059 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 1060 rxm->data_len = (uint16_t)(len[i] - hdr_size); 1061 1062 rxm->port = rxvq->port_id; 1063 1064 rx_pkts[nb_rx] = rxm; 1065 prev = rxm; 1066 1067 if (vq->hw->has_rx_offload && 1068 virtio_rx_offload(rxm, &header->hdr) < 0) { 1069 virtio_discard_rxbuf_inorder(vq, rxm); 1070 rxvq->stats.errors++; 1071 continue; 1072 } 1073 1074 if (hw->vlan_strip) 1075 rte_vlan_strip(rx_pkts[nb_rx]); 1076 1077 seg_res = seg_num - 1; 1078 1079 /* Merge remaining segments */ 1080 while (seg_res != 0 && i < (num - 1)) { 1081 i++; 1082 1083 rxm = rcv_pkts[i]; 1084 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 1085 rxm->pkt_len = (uint32_t)(len[i]); 1086 rxm->data_len = (uint16_t)(len[i]); 1087 1088 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]); 1089 rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]); 1090 1091 if (prev) 1092 prev->next = rxm; 1093 1094 prev = rxm; 1095 seg_res -= 1; 1096 } 1097 1098 if (!seg_res) { 1099 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]); 1100 nb_rx++; 1101 } 1102 } 1103 1104 /* Last packet still need merge segments */ 1105 while (seg_res != 0) { 1106 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res, 1107 VIRTIO_MBUF_BURST_SZ); 1108 1109 prev = rcv_pkts[nb_rx]; 1110 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { 1111 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, 1112 rcv_cnt); 1113 uint16_t extra_idx = 0; 1114 1115 rcv_cnt = num; 1116 while (extra_idx < rcv_cnt) { 1117 rxm = rcv_pkts[extra_idx]; 1118 rxm->data_off = 1119 RTE_PKTMBUF_HEADROOM - hdr_size; 1120 rxm->pkt_len = (uint32_t)(len[extra_idx]); 1121 rxm->data_len = (uint16_t)(len[extra_idx]); 1122 prev->next = rxm; 1123 prev = rxm; 1124 rx_pkts[nb_rx]->pkt_len += len[extra_idx]; 1125 rx_pkts[nb_rx]->data_len += len[extra_idx]; 1126 extra_idx += 1; 1127 }; 1128 seg_res -= rcv_cnt; 1129 1130 if (!seg_res) { 1131 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]); 1132 nb_rx++; 1133 } 1134 } else { 1135 PMD_RX_LOG(ERR, 1136 "No enough segments for packet."); 1137 virtio_discard_rxbuf_inorder(vq, prev); 1138 rxvq->stats.errors++; 1139 break; 1140 } 1141 } 1142 1143 rxvq->stats.packets += nb_rx; 1144 1145 /* Allocate new mbuf for the used descriptor */ 1146 1147 if (likely(!virtqueue_full(vq))) { 1148 /* free_cnt may include mrg descs */ 1149 uint16_t free_cnt = vq->vq_free_cnt; 1150 struct rte_mbuf *new_pkts[free_cnt]; 1151 1152 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) { 1153 error = virtqueue_enqueue_refill_inorder(vq, new_pkts, 1154 free_cnt); 1155 if (unlikely(error)) { 1156 for (i = 0; i < free_cnt; i++) 1157 rte_pktmbuf_free(new_pkts[i]); 1158 } 1159 nb_enqueued += free_cnt; 1160 } else { 1161 struct rte_eth_dev *dev = 1162 &rte_eth_devices[rxvq->port_id]; 1163 dev->data->rx_mbuf_alloc_failed += free_cnt; 1164 } 1165 } 1166 1167 if (likely(nb_enqueued)) { 1168 vq_update_avail_idx(vq); 1169 1170 if (unlikely(virtqueue_kick_prepare(vq))) { 1171 virtqueue_notify(vq); 1172 PMD_RX_LOG(DEBUG, "Notified"); 1173 } 1174 } 1175 1176 return nb_rx; 1177 } 1178 1179 uint16_t 1180 virtio_recv_mergeable_pkts(void *rx_queue, 1181 struct rte_mbuf **rx_pkts, 1182 uint16_t nb_pkts) 1183 { 1184 struct virtnet_rx *rxvq = rx_queue; 1185 struct virtqueue *vq = rxvq->vq; 1186 struct virtio_hw *hw = vq->hw; 1187 struct rte_mbuf *rxm, *new_mbuf; 1188 uint16_t nb_used, num, nb_rx; 1189 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 1190 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 1191 struct rte_mbuf *prev; 1192 int error; 1193 uint32_t i, nb_enqueued; 1194 uint32_t seg_num; 1195 uint16_t extra_idx; 1196 uint32_t seg_res; 1197 uint32_t hdr_size; 1198 1199 nb_rx = 0; 1200 if (unlikely(hw->started == 0)) 1201 return nb_rx; 1202 1203 nb_used = VIRTQUEUE_NUSED(vq); 1204 1205 virtio_rmb(); 1206 1207 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 1208 1209 i = 0; 1210 nb_enqueued = 0; 1211 seg_num = 0; 1212 extra_idx = 0; 1213 seg_res = 0; 1214 hdr_size = hw->vtnet_hdr_size; 1215 1216 while (i < nb_used) { 1217 struct virtio_net_hdr_mrg_rxbuf *header; 1218 1219 if (nb_rx == nb_pkts) 1220 break; 1221 1222 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); 1223 if (num != 1) 1224 continue; 1225 1226 i++; 1227 1228 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 1229 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]); 1230 1231 rxm = rcv_pkts[0]; 1232 1233 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 1234 PMD_RX_LOG(ERR, "Packet drop"); 1235 nb_enqueued++; 1236 virtio_discard_rxbuf(vq, rxm); 1237 rxvq->stats.errors++; 1238 continue; 1239 } 1240 1241 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 1242 RTE_PKTMBUF_HEADROOM - hdr_size); 1243 seg_num = header->num_buffers; 1244 1245 if (seg_num == 0) 1246 seg_num = 1; 1247 1248 rxm->data_off = RTE_PKTMBUF_HEADROOM; 1249 rxm->nb_segs = seg_num; 1250 rxm->ol_flags = 0; 1251 rxm->vlan_tci = 0; 1252 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 1253 rxm->data_len = (uint16_t)(len[0] - hdr_size); 1254 1255 rxm->port = rxvq->port_id; 1256 rx_pkts[nb_rx] = rxm; 1257 prev = rxm; 1258 1259 if (hw->has_rx_offload && 1260 virtio_rx_offload(rxm, &header->hdr) < 0) { 1261 virtio_discard_rxbuf(vq, rxm); 1262 rxvq->stats.errors++; 1263 continue; 1264 } 1265 1266 seg_res = seg_num - 1; 1267 1268 while (seg_res != 0) { 1269 /* 1270 * Get extra segments for current uncompleted packet. 1271 */ 1272 uint16_t rcv_cnt = 1273 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 1274 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { 1275 uint32_t rx_num = 1276 virtqueue_dequeue_burst_rx(vq, 1277 rcv_pkts, len, rcv_cnt); 1278 i += rx_num; 1279 rcv_cnt = rx_num; 1280 } else { 1281 PMD_RX_LOG(ERR, 1282 "No enough segments for packet."); 1283 nb_enqueued++; 1284 virtio_discard_rxbuf(vq, rxm); 1285 rxvq->stats.errors++; 1286 break; 1287 } 1288 1289 extra_idx = 0; 1290 1291 while (extra_idx < rcv_cnt) { 1292 rxm = rcv_pkts[extra_idx]; 1293 1294 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 1295 rxm->pkt_len = (uint32_t)(len[extra_idx]); 1296 rxm->data_len = (uint16_t)(len[extra_idx]); 1297 1298 if (prev) 1299 prev->next = rxm; 1300 1301 prev = rxm; 1302 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 1303 extra_idx++; 1304 }; 1305 seg_res -= rcv_cnt; 1306 } 1307 1308 if (hw->vlan_strip) 1309 rte_vlan_strip(rx_pkts[nb_rx]); 1310 1311 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 1312 rx_pkts[nb_rx]->data_len); 1313 1314 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]); 1315 nb_rx++; 1316 } 1317 1318 rxvq->stats.packets += nb_rx; 1319 1320 /* Allocate new mbuf for the used descriptor */ 1321 while (likely(!virtqueue_full(vq))) { 1322 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 1323 if (unlikely(new_mbuf == NULL)) { 1324 struct rte_eth_dev *dev 1325 = &rte_eth_devices[rxvq->port_id]; 1326 dev->data->rx_mbuf_alloc_failed++; 1327 break; 1328 } 1329 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 1330 if (unlikely(error)) { 1331 rte_pktmbuf_free(new_mbuf); 1332 break; 1333 } 1334 nb_enqueued++; 1335 } 1336 1337 if (likely(nb_enqueued)) { 1338 vq_update_avail_idx(vq); 1339 1340 if (unlikely(virtqueue_kick_prepare(vq))) { 1341 virtqueue_notify(vq); 1342 PMD_RX_LOG(DEBUG, "Notified"); 1343 } 1344 } 1345 1346 return nb_rx; 1347 } 1348 1349 uint16_t 1350 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 1351 { 1352 struct virtnet_tx *txvq = tx_queue; 1353 struct virtqueue *vq = txvq->vq; 1354 struct virtio_hw *hw = vq->hw; 1355 uint16_t hdr_size = hw->vtnet_hdr_size; 1356 uint16_t nb_used, nb_tx = 0; 1357 int error; 1358 1359 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) 1360 return nb_tx; 1361 1362 if (unlikely(nb_pkts < 1)) 1363 return nb_pkts; 1364 1365 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 1366 nb_used = VIRTQUEUE_NUSED(vq); 1367 1368 virtio_rmb(); 1369 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) 1370 virtio_xmit_cleanup(vq, nb_used); 1371 1372 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 1373 struct rte_mbuf *txm = tx_pkts[nb_tx]; 1374 int can_push = 0, use_indirect = 0, slots, need; 1375 1376 /* Do VLAN tag insertion */ 1377 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 1378 error = rte_vlan_insert(&txm); 1379 if (unlikely(error)) { 1380 rte_pktmbuf_free(txm); 1381 continue; 1382 } 1383 } 1384 1385 /* optimize ring usage */ 1386 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) || 1387 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) && 1388 rte_mbuf_refcnt_read(txm) == 1 && 1389 RTE_MBUF_DIRECT(txm) && 1390 txm->nb_segs == 1 && 1391 rte_pktmbuf_headroom(txm) >= hdr_size && 1392 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 1393 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 1394 can_push = 1; 1395 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 1396 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 1397 use_indirect = 1; 1398 1399 /* How many main ring entries are needed to this Tx? 1400 * any_layout => number of segments 1401 * indirect => 1 1402 * default => number of segments + 1 1403 */ 1404 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 1405 need = slots - vq->vq_free_cnt; 1406 1407 /* Positive value indicates it need free vring descriptors */ 1408 if (unlikely(need > 0)) { 1409 nb_used = VIRTQUEUE_NUSED(vq); 1410 virtio_rmb(); 1411 need = RTE_MIN(need, (int)nb_used); 1412 1413 virtio_xmit_cleanup(vq, need); 1414 need = slots - vq->vq_free_cnt; 1415 if (unlikely(need > 0)) { 1416 PMD_TX_LOG(ERR, 1417 "No free tx descriptors to transmit"); 1418 break; 1419 } 1420 } 1421 1422 /* Enqueue Packet buffers */ 1423 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, 1424 can_push, 0); 1425 1426 virtio_update_packet_stats(&txvq->stats, txm); 1427 } 1428 1429 txvq->stats.packets += nb_tx; 1430 1431 if (likely(nb_tx)) { 1432 vq_update_avail_idx(vq); 1433 1434 if (unlikely(virtqueue_kick_prepare(vq))) { 1435 virtqueue_notify(vq); 1436 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 1437 } 1438 } 1439 1440 return nb_tx; 1441 } 1442 1443 uint16_t 1444 virtio_xmit_pkts_inorder(void *tx_queue, 1445 struct rte_mbuf **tx_pkts, 1446 uint16_t nb_pkts) 1447 { 1448 struct virtnet_tx *txvq = tx_queue; 1449 struct virtqueue *vq = txvq->vq; 1450 struct virtio_hw *hw = vq->hw; 1451 uint16_t hdr_size = hw->vtnet_hdr_size; 1452 uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0; 1453 struct rte_mbuf *inorder_pkts[nb_pkts]; 1454 int error; 1455 1456 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) 1457 return nb_tx; 1458 1459 if (unlikely(nb_pkts < 1)) 1460 return nb_pkts; 1461 1462 VIRTQUEUE_DUMP(vq); 1463 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 1464 nb_used = VIRTQUEUE_NUSED(vq); 1465 1466 virtio_rmb(); 1467 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) 1468 virtio_xmit_cleanup_inorder(vq, nb_used); 1469 1470 if (unlikely(!vq->vq_free_cnt)) 1471 virtio_xmit_cleanup_inorder(vq, nb_used); 1472 1473 nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts); 1474 1475 for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) { 1476 struct rte_mbuf *txm = tx_pkts[nb_tx]; 1477 int slots, need; 1478 1479 /* Do VLAN tag insertion */ 1480 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 1481 error = rte_vlan_insert(&txm); 1482 if (unlikely(error)) { 1483 rte_pktmbuf_free(txm); 1484 continue; 1485 } 1486 } 1487 1488 /* optimize ring usage */ 1489 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) || 1490 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) && 1491 rte_mbuf_refcnt_read(txm) == 1 && 1492 RTE_MBUF_DIRECT(txm) && 1493 txm->nb_segs == 1 && 1494 rte_pktmbuf_headroom(txm) >= hdr_size && 1495 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 1496 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) { 1497 inorder_pkts[nb_inorder_pkts] = txm; 1498 nb_inorder_pkts++; 1499 1500 virtio_update_packet_stats(&txvq->stats, txm); 1501 continue; 1502 } 1503 1504 if (nb_inorder_pkts) { 1505 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts, 1506 nb_inorder_pkts); 1507 nb_inorder_pkts = 0; 1508 } 1509 1510 slots = txm->nb_segs + 1; 1511 need = slots - vq->vq_free_cnt; 1512 if (unlikely(need > 0)) { 1513 nb_used = VIRTQUEUE_NUSED(vq); 1514 virtio_rmb(); 1515 need = RTE_MIN(need, (int)nb_used); 1516 1517 virtio_xmit_cleanup_inorder(vq, need); 1518 1519 need = slots - vq->vq_free_cnt; 1520 1521 if (unlikely(need > 0)) { 1522 PMD_TX_LOG(ERR, 1523 "No free tx descriptors to transmit"); 1524 break; 1525 } 1526 } 1527 /* Enqueue Packet buffers */ 1528 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1); 1529 1530 virtio_update_packet_stats(&txvq->stats, txm); 1531 } 1532 1533 /* Transmit all inorder packets */ 1534 if (nb_inorder_pkts) 1535 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts, 1536 nb_inorder_pkts); 1537 1538 txvq->stats.packets += nb_tx; 1539 1540 if (likely(nb_tx)) { 1541 vq_update_avail_idx(vq); 1542 1543 if (unlikely(virtqueue_kick_prepare(vq))) { 1544 virtqueue_notify(vq); 1545 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 1546 } 1547 } 1548 1549 VIRTQUEUE_DUMP(vq); 1550 1551 return nb_tx; 1552 } 1553