1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <stdint.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <errno.h> 39 40 #include <rte_cycles.h> 41 #include <rte_memory.h> 42 #include <rte_memzone.h> 43 #include <rte_branch_prediction.h> 44 #include <rte_mempool.h> 45 #include <rte_malloc.h> 46 #include <rte_mbuf.h> 47 #include <rte_ether.h> 48 #include <rte_ethdev.h> 49 #include <rte_prefetch.h> 50 #include <rte_string_fns.h> 51 #include <rte_errno.h> 52 #include <rte_byteorder.h> 53 #include <rte_cpuflags.h> 54 #include <rte_net.h> 55 #include <rte_ip.h> 56 #include <rte_udp.h> 57 #include <rte_tcp.h> 58 59 #include "virtio_logs.h" 60 #include "virtio_ethdev.h" 61 #include "virtio_pci.h" 62 #include "virtqueue.h" 63 #include "virtio_rxtx.h" 64 65 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP 66 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len) 67 #else 68 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0) 69 #endif 70 71 72 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \ 73 ETH_TXQ_FLAGS_NOOFFLOADS) 74 75 static void 76 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) 77 { 78 struct vring_desc *dp, *dp_tail; 79 struct vq_desc_extra *dxp; 80 uint16_t desc_idx_last = desc_idx; 81 82 dp = &vq->vq_ring.desc[desc_idx]; 83 dxp = &vq->vq_descx[desc_idx]; 84 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs); 85 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) { 86 while (dp->flags & VRING_DESC_F_NEXT) { 87 desc_idx_last = dp->next; 88 dp = &vq->vq_ring.desc[dp->next]; 89 } 90 } 91 dxp->ndescs = 0; 92 93 /* 94 * We must append the existing free chain, if any, to the end of 95 * newly freed chain. If the virtqueue was completely used, then 96 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above). 97 */ 98 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) { 99 vq->vq_desc_head_idx = desc_idx; 100 } else { 101 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx]; 102 dp_tail->next = desc_idx; 103 } 104 105 vq->vq_desc_tail_idx = desc_idx_last; 106 dp->next = VQ_RING_DESC_CHAIN_END; 107 } 108 109 static uint16_t 110 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, 111 uint32_t *len, uint16_t num) 112 { 113 struct vring_used_elem *uep; 114 struct rte_mbuf *cookie; 115 uint16_t used_idx, desc_idx; 116 uint16_t i; 117 118 /* Caller does the check */ 119 for (i = 0; i < num ; i++) { 120 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 121 uep = &vq->vq_ring.used->ring[used_idx]; 122 desc_idx = (uint16_t) uep->id; 123 len[i] = uep->len; 124 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie; 125 126 if (unlikely(cookie == NULL)) { 127 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n", 128 vq->vq_used_cons_idx); 129 break; 130 } 131 132 rte_prefetch0(cookie); 133 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); 134 rx_pkts[i] = cookie; 135 vq->vq_used_cons_idx++; 136 vq_ring_free_chain(vq, desc_idx); 137 vq->vq_descx[desc_idx].cookie = NULL; 138 } 139 140 return i; 141 } 142 143 #ifndef DEFAULT_TX_FREE_THRESH 144 #define DEFAULT_TX_FREE_THRESH 32 145 #endif 146 147 /* Cleanup from completed transmits. */ 148 static void 149 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) 150 { 151 uint16_t i, used_idx, desc_idx; 152 for (i = 0; i < num; i++) { 153 struct vring_used_elem *uep; 154 struct vq_desc_extra *dxp; 155 156 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 157 uep = &vq->vq_ring.used->ring[used_idx]; 158 159 desc_idx = (uint16_t) uep->id; 160 dxp = &vq->vq_descx[desc_idx]; 161 vq->vq_used_cons_idx++; 162 vq_ring_free_chain(vq, desc_idx); 163 164 if (dxp->cookie != NULL) { 165 rte_pktmbuf_free(dxp->cookie); 166 dxp->cookie = NULL; 167 } 168 } 169 } 170 171 172 static inline int 173 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) 174 { 175 struct vq_desc_extra *dxp; 176 struct virtio_hw *hw = vq->hw; 177 struct vring_desc *start_dp; 178 uint16_t needed = 1; 179 uint16_t head_idx, idx; 180 181 if (unlikely(vq->vq_free_cnt == 0)) 182 return -ENOSPC; 183 if (unlikely(vq->vq_free_cnt < needed)) 184 return -EMSGSIZE; 185 186 head_idx = vq->vq_desc_head_idx; 187 if (unlikely(head_idx >= vq->vq_nentries)) 188 return -EFAULT; 189 190 idx = head_idx; 191 dxp = &vq->vq_descx[idx]; 192 dxp->cookie = (void *)cookie; 193 dxp->ndescs = needed; 194 195 start_dp = vq->vq_ring.desc; 196 start_dp[idx].addr = 197 VIRTIO_MBUF_ADDR(cookie, vq) + 198 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size; 199 start_dp[idx].len = 200 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size; 201 start_dp[idx].flags = VRING_DESC_F_WRITE; 202 idx = start_dp[idx].next; 203 vq->vq_desc_head_idx = idx; 204 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 205 vq->vq_desc_tail_idx = idx; 206 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 207 vq_update_avail_ring(vq, head_idx); 208 209 return 0; 210 } 211 212 /* When doing TSO, the IP length is not included in the pseudo header 213 * checksum of the packet given to the PMD, but for virtio it is 214 * expected. 215 */ 216 static void 217 virtio_tso_fix_cksum(struct rte_mbuf *m) 218 { 219 /* common case: header is not fragmented */ 220 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len + 221 m->l4_len)) { 222 struct ipv4_hdr *iph; 223 struct ipv6_hdr *ip6h; 224 struct tcp_hdr *th; 225 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen; 226 uint32_t tmp; 227 228 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len); 229 th = RTE_PTR_ADD(iph, m->l3_len); 230 if ((iph->version_ihl >> 4) == 4) { 231 iph->hdr_checksum = 0; 232 iph->hdr_checksum = rte_ipv4_cksum(iph); 233 ip_len = iph->total_length; 234 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) - 235 m->l3_len); 236 } else { 237 ip6h = (struct ipv6_hdr *)iph; 238 ip_paylen = ip6h->payload_len; 239 } 240 241 /* calculate the new phdr checksum not including ip_paylen */ 242 prev_cksum = th->cksum; 243 tmp = prev_cksum; 244 tmp += ip_paylen; 245 tmp = (tmp & 0xffff) + (tmp >> 16); 246 new_cksum = tmp; 247 248 /* replace it in the packet */ 249 th->cksum = new_cksum; 250 } 251 } 252 253 static inline int 254 tx_offload_enabled(struct virtio_hw *hw) 255 { 256 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) || 257 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) || 258 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6); 259 } 260 261 static inline void 262 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, 263 uint16_t needed, int use_indirect, int can_push) 264 { 265 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; 266 struct vq_desc_extra *dxp; 267 struct virtqueue *vq = txvq->vq; 268 struct vring_desc *start_dp; 269 uint16_t seg_num = cookie->nb_segs; 270 uint16_t head_idx, idx; 271 uint16_t head_size = vq->hw->vtnet_hdr_size; 272 struct virtio_net_hdr *hdr; 273 int offload; 274 275 offload = tx_offload_enabled(vq->hw); 276 head_idx = vq->vq_desc_head_idx; 277 idx = head_idx; 278 dxp = &vq->vq_descx[idx]; 279 dxp->cookie = (void *)cookie; 280 dxp->ndescs = needed; 281 282 start_dp = vq->vq_ring.desc; 283 284 if (can_push) { 285 /* prepend cannot fail, checked by caller */ 286 hdr = (struct virtio_net_hdr *) 287 rte_pktmbuf_prepend(cookie, head_size); 288 /* if offload disabled, it is not zeroed below, do it now */ 289 if (offload == 0) 290 memset(hdr, 0, head_size); 291 } else if (use_indirect) { 292 /* setup tx ring slot to point to indirect 293 * descriptor list stored in reserved region. 294 * 295 * the first slot in indirect ring is already preset 296 * to point to the header in reserved region 297 */ 298 start_dp[idx].addr = txvq->virtio_net_hdr_mem + 299 RTE_PTR_DIFF(&txr[idx].tx_indir, txr); 300 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc); 301 start_dp[idx].flags = VRING_DESC_F_INDIRECT; 302 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr; 303 304 /* loop below will fill in rest of the indirect elements */ 305 start_dp = txr[idx].tx_indir; 306 idx = 1; 307 } else { 308 /* setup first tx ring slot to point to header 309 * stored in reserved region. 310 */ 311 start_dp[idx].addr = txvq->virtio_net_hdr_mem + 312 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr); 313 start_dp[idx].len = vq->hw->vtnet_hdr_size; 314 start_dp[idx].flags = VRING_DESC_F_NEXT; 315 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr; 316 317 idx = start_dp[idx].next; 318 } 319 320 /* Checksum Offload / TSO */ 321 if (offload) { 322 if (cookie->ol_flags & PKT_TX_TCP_SEG) 323 cookie->ol_flags |= PKT_TX_TCP_CKSUM; 324 325 switch (cookie->ol_flags & PKT_TX_L4_MASK) { 326 case PKT_TX_UDP_CKSUM: 327 hdr->csum_start = cookie->l2_len + cookie->l3_len; 328 hdr->csum_offset = offsetof(struct udp_hdr, 329 dgram_cksum); 330 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 331 break; 332 333 case PKT_TX_TCP_CKSUM: 334 hdr->csum_start = cookie->l2_len + cookie->l3_len; 335 hdr->csum_offset = offsetof(struct tcp_hdr, cksum); 336 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 337 break; 338 339 default: 340 hdr->csum_start = 0; 341 hdr->csum_offset = 0; 342 hdr->flags = 0; 343 break; 344 } 345 346 /* TCP Segmentation Offload */ 347 if (cookie->ol_flags & PKT_TX_TCP_SEG) { 348 virtio_tso_fix_cksum(cookie); 349 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ? 350 VIRTIO_NET_HDR_GSO_TCPV6 : 351 VIRTIO_NET_HDR_GSO_TCPV4; 352 hdr->gso_size = cookie->tso_segsz; 353 hdr->hdr_len = 354 cookie->l2_len + 355 cookie->l3_len + 356 cookie->l4_len; 357 } else { 358 hdr->gso_type = 0; 359 hdr->gso_size = 0; 360 hdr->hdr_len = 0; 361 } 362 } 363 364 do { 365 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); 366 start_dp[idx].len = cookie->data_len; 367 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0; 368 idx = start_dp[idx].next; 369 } while ((cookie = cookie->next) != NULL); 370 371 if (use_indirect) 372 idx = vq->vq_ring.desc[head_idx].next; 373 374 vq->vq_desc_head_idx = idx; 375 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 376 vq->vq_desc_tail_idx = idx; 377 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 378 vq_update_avail_ring(vq, head_idx); 379 } 380 381 static void 382 virtio_dev_vring_start(struct virtqueue *vq) 383 { 384 int size = vq->vq_nentries; 385 struct vring *vr = &vq->vq_ring; 386 uint8_t *ring_mem = vq->vq_ring_virt_mem; 387 388 PMD_INIT_FUNC_TRACE(); 389 390 /* 391 * Reinitialise since virtio port might have been stopped and restarted 392 */ 393 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size); 394 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); 395 vq->vq_used_cons_idx = 0; 396 vq->vq_desc_head_idx = 0; 397 vq->vq_avail_idx = 0; 398 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1); 399 vq->vq_free_cnt = vq->vq_nentries; 400 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); 401 402 vring_desc_init(vr->desc, size); 403 404 /* 405 * Disable device(host) interrupting guest 406 */ 407 virtqueue_disable_intr(vq); 408 } 409 410 void 411 virtio_dev_cq_start(struct rte_eth_dev *dev) 412 { 413 struct virtio_hw *hw = dev->data->dev_private; 414 415 if (hw->cvq && hw->cvq->vq) { 416 virtio_dev_vring_start(hw->cvq->vq); 417 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq); 418 } 419 } 420 421 void 422 virtio_dev_rxtx_start(struct rte_eth_dev *dev) 423 { 424 /* 425 * Start receive and transmit vrings 426 * - Setup vring structure for all queues 427 * - Initialize descriptor for the rx vring 428 * - Allocate blank mbufs for the each rx descriptor 429 * 430 */ 431 uint16_t i; 432 uint16_t desc_idx; 433 struct virtio_hw *hw = dev->data->dev_private; 434 435 PMD_INIT_FUNC_TRACE(); 436 437 /* Start rx vring. */ 438 for (i = 0; i < dev->data->nb_rx_queues; i++) { 439 struct virtnet_rx *rxvq = dev->data->rx_queues[i]; 440 struct virtqueue *vq = rxvq->vq; 441 int error, nbufs; 442 struct rte_mbuf *m; 443 444 virtio_dev_vring_start(vq); 445 if (rxvq->mpool == NULL) { 446 rte_exit(EXIT_FAILURE, 447 "Cannot allocate mbufs for rx virtqueue"); 448 } 449 450 /* Allocate blank mbufs for the each rx descriptor */ 451 nbufs = 0; 452 error = ENOSPC; 453 454 if (hw->use_simple_rxtx) { 455 for (desc_idx = 0; desc_idx < vq->vq_nentries; 456 desc_idx++) { 457 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 458 vq->vq_ring.desc[desc_idx].flags = 459 VRING_DESC_F_WRITE; 460 } 461 } 462 463 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf)); 464 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; 465 desc_idx++) { 466 vq->sw_ring[vq->vq_nentries + desc_idx] = 467 &rxvq->fake_mbuf; 468 } 469 470 while (!virtqueue_full(vq)) { 471 m = rte_mbuf_raw_alloc(rxvq->mpool); 472 if (m == NULL) 473 break; 474 475 /****************************************** 476 * Enqueue allocated buffers * 477 *******************************************/ 478 if (hw->use_simple_rxtx) 479 error = virtqueue_enqueue_recv_refill_simple(vq, m); 480 else 481 error = virtqueue_enqueue_recv_refill(vq, m); 482 483 if (error) { 484 rte_pktmbuf_free(m); 485 break; 486 } 487 nbufs++; 488 } 489 490 vq_update_avail_idx(vq); 491 492 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 493 494 VIRTQUEUE_DUMP(vq); 495 } 496 497 /* Start tx vring. */ 498 for (i = 0; i < dev->data->nb_tx_queues; i++) { 499 struct virtnet_tx *txvq = dev->data->tx_queues[i]; 500 struct virtqueue *vq = txvq->vq; 501 502 virtio_dev_vring_start(vq); 503 if (hw->use_simple_rxtx) { 504 uint16_t mid_idx = vq->vq_nentries >> 1; 505 506 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) { 507 vq->vq_ring.avail->ring[desc_idx] = 508 desc_idx + mid_idx; 509 vq->vq_ring.desc[desc_idx + mid_idx].next = 510 desc_idx; 511 vq->vq_ring.desc[desc_idx + mid_idx].addr = 512 txvq->virtio_net_hdr_mem + 513 offsetof(struct virtio_tx_region, tx_hdr); 514 vq->vq_ring.desc[desc_idx + mid_idx].len = 515 vq->hw->vtnet_hdr_size; 516 vq->vq_ring.desc[desc_idx + mid_idx].flags = 517 VRING_DESC_F_NEXT; 518 vq->vq_ring.desc[desc_idx].flags = 0; 519 } 520 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries; 521 desc_idx++) 522 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 523 } 524 525 VIRTQUEUE_DUMP(vq); 526 } 527 } 528 529 int 530 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, 531 uint16_t queue_idx, 532 uint16_t nb_desc, 533 unsigned int socket_id, 534 __rte_unused const struct rte_eth_rxconf *rx_conf, 535 struct rte_mempool *mp) 536 { 537 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 538 struct virtnet_rx *rxvq; 539 int ret; 540 541 PMD_INIT_FUNC_TRACE(); 542 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx, 543 nb_desc, socket_id, (void **)&rxvq); 544 if (ret < 0) { 545 PMD_INIT_LOG(ERR, "rvq initialization failed"); 546 return ret; 547 } 548 549 /* Create mempool for rx mbuf allocation */ 550 rxvq->mpool = mp; 551 552 dev->data->rx_queues[queue_idx] = rxvq; 553 554 virtio_rxq_vec_setup(rxvq); 555 556 return 0; 557 } 558 559 void 560 virtio_dev_rx_queue_release(void *rxq) 561 { 562 struct virtnet_rx *rxvq = rxq; 563 struct virtqueue *vq; 564 const struct rte_memzone *mz; 565 566 if (rxvq == NULL) 567 return; 568 569 /* 570 * rxvq is freed when vq is freed, and as mz should be freed after the 571 * del_queue, so we reserve the mz pointer first. 572 */ 573 vq = rxvq->vq; 574 mz = rxvq->mz; 575 576 virtio_dev_queue_release(vq); 577 rte_memzone_free(mz); 578 } 579 580 static void 581 virtio_update_rxtx_handler(struct rte_eth_dev *dev, 582 const struct rte_eth_txconf *tx_conf) 583 { 584 uint8_t use_simple_rxtx = 0; 585 struct virtio_hw *hw = dev->data->dev_private; 586 587 #if defined RTE_ARCH_X86 588 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3)) 589 use_simple_rxtx = 1; 590 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM 591 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON)) 592 use_simple_rxtx = 1; 593 #endif 594 /* Use simple rx/tx func if single segment and no offloads */ 595 if (use_simple_rxtx && 596 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS && 597 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { 598 PMD_INIT_LOG(INFO, "Using simple rx/tx path"); 599 dev->tx_pkt_burst = virtio_xmit_pkts_simple; 600 dev->rx_pkt_burst = virtio_recv_pkts_vec; 601 hw->use_simple_rxtx = use_simple_rxtx; 602 } 603 } 604 605 /* 606 * struct rte_eth_dev *dev: Used to update dev 607 * uint16_t nb_desc: Defaults to values read from config space 608 * unsigned int socket_id: Used to allocate memzone 609 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 610 * uint16_t queue_idx: Just used as an index in dev txq list 611 */ 612 int 613 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 614 uint16_t queue_idx, 615 uint16_t nb_desc, 616 unsigned int socket_id, 617 const struct rte_eth_txconf *tx_conf) 618 { 619 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 620 struct virtnet_tx *txvq; 621 struct virtqueue *vq; 622 uint16_t tx_free_thresh; 623 int ret; 624 625 PMD_INIT_FUNC_TRACE(); 626 627 628 virtio_update_rxtx_handler(dev, tx_conf); 629 630 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx, 631 nb_desc, socket_id, (void **)&txvq); 632 if (ret < 0) { 633 PMD_INIT_LOG(ERR, "tvq initialization failed"); 634 return ret; 635 } 636 vq = txvq->vq; 637 638 tx_free_thresh = tx_conf->tx_free_thresh; 639 if (tx_free_thresh == 0) 640 tx_free_thresh = 641 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 642 643 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 644 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 645 "number of TX entries minus 3 (%u)." 646 " (tx_free_thresh=%u port=%u queue=%u)\n", 647 vq->vq_nentries - 3, 648 tx_free_thresh, dev->data->port_id, queue_idx); 649 return -EINVAL; 650 } 651 652 vq->vq_free_thresh = tx_free_thresh; 653 654 dev->data->tx_queues[queue_idx] = txvq; 655 return 0; 656 } 657 658 void 659 virtio_dev_tx_queue_release(void *txq) 660 { 661 struct virtnet_tx *txvq = txq; 662 struct virtqueue *vq; 663 const struct rte_memzone *mz; 664 const struct rte_memzone *hdr_mz; 665 666 if (txvq == NULL) 667 return; 668 669 /* 670 * txvq is freed when vq is freed, and as mz should be freed after the 671 * del_queue, so we reserve the mz pointer first. 672 */ 673 vq = txvq->vq; 674 mz = txvq->mz; 675 hdr_mz = txvq->virtio_net_hdr_mz; 676 677 virtio_dev_queue_release(vq); 678 rte_memzone_free(mz); 679 rte_memzone_free(hdr_mz); 680 } 681 682 static void 683 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 684 { 685 int error; 686 /* 687 * Requeue the discarded mbuf. This should always be 688 * successful since it was just dequeued. 689 */ 690 error = virtqueue_enqueue_recv_refill(vq, m); 691 if (unlikely(error)) { 692 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 693 rte_pktmbuf_free(m); 694 } 695 } 696 697 static void 698 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf) 699 { 700 uint32_t s = mbuf->pkt_len; 701 struct ether_addr *ea; 702 703 if (s == 64) { 704 stats->size_bins[1]++; 705 } else if (s > 64 && s < 1024) { 706 uint32_t bin; 707 708 /* count zeros, and offset into correct bin */ 709 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 710 stats->size_bins[bin]++; 711 } else { 712 if (s < 64) 713 stats->size_bins[0]++; 714 else if (s < 1519) 715 stats->size_bins[6]++; 716 else if (s >= 1519) 717 stats->size_bins[7]++; 718 } 719 720 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 721 if (is_multicast_ether_addr(ea)) { 722 if (is_broadcast_ether_addr(ea)) 723 stats->broadcast++; 724 else 725 stats->multicast++; 726 } 727 } 728 729 /* Optionally fill offload information in structure */ 730 static int 731 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr) 732 { 733 struct rte_net_hdr_lens hdr_lens; 734 uint32_t hdrlen, ptype; 735 int l4_supported = 0; 736 737 /* nothing to do */ 738 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE) 739 return 0; 740 741 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN; 742 743 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK); 744 m->packet_type = ptype; 745 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP || 746 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP || 747 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP) 748 l4_supported = 1; 749 750 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 751 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len; 752 if (hdr->csum_start <= hdrlen && l4_supported) { 753 m->ol_flags |= PKT_RX_L4_CKSUM_NONE; 754 } else { 755 /* Unknown proto or tunnel, do sw cksum. We can assume 756 * the cksum field is in the first segment since the 757 * buffers we provided to the host are large enough. 758 * In case of SCTP, this will be wrong since it's a CRC 759 * but there's nothing we can do. 760 */ 761 uint16_t csum, off; 762 763 rte_raw_cksum_mbuf(m, hdr->csum_start, 764 rte_pktmbuf_pkt_len(m) - hdr->csum_start, 765 &csum); 766 if (likely(csum != 0xffff)) 767 csum = ~csum; 768 off = hdr->csum_offset + hdr->csum_start; 769 if (rte_pktmbuf_data_len(m) >= off + 1) 770 *rte_pktmbuf_mtod_offset(m, uint16_t *, 771 off) = csum; 772 } 773 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) { 774 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD; 775 } 776 777 /* GSO request, save required information in mbuf */ 778 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { 779 /* Check unsupported modes */ 780 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) || 781 (hdr->gso_size == 0)) { 782 return -EINVAL; 783 } 784 785 /* Update mss lengthes in mbuf */ 786 m->tso_segsz = hdr->gso_size; 787 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 788 case VIRTIO_NET_HDR_GSO_TCPV4: 789 case VIRTIO_NET_HDR_GSO_TCPV6: 790 m->ol_flags |= PKT_RX_LRO | \ 791 PKT_RX_L4_CKSUM_NONE; 792 break; 793 default: 794 return -EINVAL; 795 } 796 } 797 798 return 0; 799 } 800 801 static inline int 802 rx_offload_enabled(struct virtio_hw *hw) 803 { 804 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) || 805 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) || 806 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6); 807 } 808 809 #define VIRTIO_MBUF_BURST_SZ 64 810 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 811 uint16_t 812 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 813 { 814 struct virtnet_rx *rxvq = rx_queue; 815 struct virtqueue *vq = rxvq->vq; 816 struct virtio_hw *hw; 817 struct rte_mbuf *rxm, *new_mbuf; 818 uint16_t nb_used, num, nb_rx; 819 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 820 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 821 int error; 822 uint32_t i, nb_enqueued; 823 uint32_t hdr_size; 824 int offload; 825 struct virtio_net_hdr *hdr; 826 827 nb_used = VIRTQUEUE_NUSED(vq); 828 829 virtio_rmb(); 830 831 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts); 832 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ); 833 if (likely(num > DESC_PER_CACHELINE)) 834 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 835 836 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num); 837 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 838 839 hw = vq->hw; 840 nb_rx = 0; 841 nb_enqueued = 0; 842 hdr_size = hw->vtnet_hdr_size; 843 offload = rx_offload_enabled(hw); 844 845 for (i = 0; i < num ; i++) { 846 rxm = rcv_pkts[i]; 847 848 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 849 850 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 851 PMD_RX_LOG(ERR, "Packet drop"); 852 nb_enqueued++; 853 virtio_discard_rxbuf(vq, rxm); 854 rxvq->stats.errors++; 855 continue; 856 } 857 858 rxm->port = rxvq->port_id; 859 rxm->data_off = RTE_PKTMBUF_HEADROOM; 860 rxm->ol_flags = 0; 861 rxm->vlan_tci = 0; 862 863 rxm->nb_segs = 1; 864 rxm->next = NULL; 865 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 866 rxm->data_len = (uint16_t)(len[i] - hdr_size); 867 868 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr + 869 RTE_PKTMBUF_HEADROOM - hdr_size); 870 871 if (hw->vlan_strip) 872 rte_vlan_strip(rxm); 873 874 if (offload && virtio_rx_offload(rxm, hdr) < 0) { 875 virtio_discard_rxbuf(vq, rxm); 876 rxvq->stats.errors++; 877 continue; 878 } 879 880 VIRTIO_DUMP_PACKET(rxm, rxm->data_len); 881 882 rx_pkts[nb_rx++] = rxm; 883 884 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len; 885 virtio_update_packet_stats(&rxvq->stats, rxm); 886 } 887 888 rxvq->stats.packets += nb_rx; 889 890 /* Allocate new mbuf for the used descriptor */ 891 error = ENOSPC; 892 while (likely(!virtqueue_full(vq))) { 893 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 894 if (unlikely(new_mbuf == NULL)) { 895 struct rte_eth_dev *dev 896 = &rte_eth_devices[rxvq->port_id]; 897 dev->data->rx_mbuf_alloc_failed++; 898 break; 899 } 900 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 901 if (unlikely(error)) { 902 rte_pktmbuf_free(new_mbuf); 903 break; 904 } 905 nb_enqueued++; 906 } 907 908 if (likely(nb_enqueued)) { 909 vq_update_avail_idx(vq); 910 911 if (unlikely(virtqueue_kick_prepare(vq))) { 912 virtqueue_notify(vq); 913 PMD_RX_LOG(DEBUG, "Notified"); 914 } 915 } 916 917 return nb_rx; 918 } 919 920 uint16_t 921 virtio_recv_mergeable_pkts(void *rx_queue, 922 struct rte_mbuf **rx_pkts, 923 uint16_t nb_pkts) 924 { 925 struct virtnet_rx *rxvq = rx_queue; 926 struct virtqueue *vq = rxvq->vq; 927 struct virtio_hw *hw; 928 struct rte_mbuf *rxm, *new_mbuf; 929 uint16_t nb_used, num, nb_rx; 930 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 931 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 932 struct rte_mbuf *prev; 933 int error; 934 uint32_t i, nb_enqueued; 935 uint32_t seg_num; 936 uint16_t extra_idx; 937 uint32_t seg_res; 938 uint32_t hdr_size; 939 int offload; 940 941 nb_used = VIRTQUEUE_NUSED(vq); 942 943 virtio_rmb(); 944 945 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 946 947 hw = vq->hw; 948 nb_rx = 0; 949 i = 0; 950 nb_enqueued = 0; 951 seg_num = 0; 952 extra_idx = 0; 953 seg_res = 0; 954 hdr_size = hw->vtnet_hdr_size; 955 offload = rx_offload_enabled(hw); 956 957 while (i < nb_used) { 958 struct virtio_net_hdr_mrg_rxbuf *header; 959 960 if (nb_rx == nb_pkts) 961 break; 962 963 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); 964 if (num != 1) 965 continue; 966 967 i++; 968 969 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 970 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]); 971 972 rxm = rcv_pkts[0]; 973 974 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 975 PMD_RX_LOG(ERR, "Packet drop"); 976 nb_enqueued++; 977 virtio_discard_rxbuf(vq, rxm); 978 rxvq->stats.errors++; 979 continue; 980 } 981 982 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 983 RTE_PKTMBUF_HEADROOM - hdr_size); 984 seg_num = header->num_buffers; 985 986 if (seg_num == 0) 987 seg_num = 1; 988 989 rxm->data_off = RTE_PKTMBUF_HEADROOM; 990 rxm->nb_segs = seg_num; 991 rxm->next = NULL; 992 rxm->ol_flags = 0; 993 rxm->vlan_tci = 0; 994 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 995 rxm->data_len = (uint16_t)(len[0] - hdr_size); 996 997 rxm->port = rxvq->port_id; 998 rx_pkts[nb_rx] = rxm; 999 prev = rxm; 1000 1001 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) { 1002 virtio_discard_rxbuf(vq, rxm); 1003 rxvq->stats.errors++; 1004 continue; 1005 } 1006 1007 seg_res = seg_num - 1; 1008 1009 while (seg_res != 0) { 1010 /* 1011 * Get extra segments for current uncompleted packet. 1012 */ 1013 uint16_t rcv_cnt = 1014 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 1015 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { 1016 uint32_t rx_num = 1017 virtqueue_dequeue_burst_rx(vq, 1018 rcv_pkts, len, rcv_cnt); 1019 i += rx_num; 1020 rcv_cnt = rx_num; 1021 } else { 1022 PMD_RX_LOG(ERR, 1023 "No enough segments for packet."); 1024 nb_enqueued++; 1025 virtio_discard_rxbuf(vq, rxm); 1026 rxvq->stats.errors++; 1027 break; 1028 } 1029 1030 extra_idx = 0; 1031 1032 while (extra_idx < rcv_cnt) { 1033 rxm = rcv_pkts[extra_idx]; 1034 1035 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 1036 rxm->next = NULL; 1037 rxm->pkt_len = (uint32_t)(len[extra_idx]); 1038 rxm->data_len = (uint16_t)(len[extra_idx]); 1039 1040 if (prev) 1041 prev->next = rxm; 1042 1043 prev = rxm; 1044 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 1045 extra_idx++; 1046 }; 1047 seg_res -= rcv_cnt; 1048 } 1049 1050 if (hw->vlan_strip) 1051 rte_vlan_strip(rx_pkts[nb_rx]); 1052 1053 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 1054 rx_pkts[nb_rx]->data_len); 1055 1056 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len; 1057 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]); 1058 nb_rx++; 1059 } 1060 1061 rxvq->stats.packets += nb_rx; 1062 1063 /* Allocate new mbuf for the used descriptor */ 1064 error = ENOSPC; 1065 while (likely(!virtqueue_full(vq))) { 1066 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 1067 if (unlikely(new_mbuf == NULL)) { 1068 struct rte_eth_dev *dev 1069 = &rte_eth_devices[rxvq->port_id]; 1070 dev->data->rx_mbuf_alloc_failed++; 1071 break; 1072 } 1073 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 1074 if (unlikely(error)) { 1075 rte_pktmbuf_free(new_mbuf); 1076 break; 1077 } 1078 nb_enqueued++; 1079 } 1080 1081 if (likely(nb_enqueued)) { 1082 vq_update_avail_idx(vq); 1083 1084 if (unlikely(virtqueue_kick_prepare(vq))) { 1085 virtqueue_notify(vq); 1086 PMD_RX_LOG(DEBUG, "Notified"); 1087 } 1088 } 1089 1090 return nb_rx; 1091 } 1092 1093 uint16_t 1094 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 1095 { 1096 struct virtnet_tx *txvq = tx_queue; 1097 struct virtqueue *vq = txvq->vq; 1098 struct virtio_hw *hw = vq->hw; 1099 uint16_t hdr_size = hw->vtnet_hdr_size; 1100 uint16_t nb_used, nb_tx; 1101 int error; 1102 1103 if (unlikely(nb_pkts < 1)) 1104 return nb_pkts; 1105 1106 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 1107 nb_used = VIRTQUEUE_NUSED(vq); 1108 1109 virtio_rmb(); 1110 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) 1111 virtio_xmit_cleanup(vq, nb_used); 1112 1113 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 1114 struct rte_mbuf *txm = tx_pkts[nb_tx]; 1115 int can_push = 0, use_indirect = 0, slots, need; 1116 1117 /* Do VLAN tag insertion */ 1118 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 1119 error = rte_vlan_insert(&txm); 1120 if (unlikely(error)) { 1121 rte_pktmbuf_free(txm); 1122 continue; 1123 } 1124 } 1125 1126 /* optimize ring usage */ 1127 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) && 1128 rte_mbuf_refcnt_read(txm) == 1 && 1129 RTE_MBUF_DIRECT(txm) && 1130 txm->nb_segs == 1 && 1131 rte_pktmbuf_headroom(txm) >= hdr_size && 1132 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 1133 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 1134 can_push = 1; 1135 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 1136 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 1137 use_indirect = 1; 1138 1139 /* How many main ring entries are needed to this Tx? 1140 * any_layout => number of segments 1141 * indirect => 1 1142 * default => number of segments + 1 1143 */ 1144 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 1145 need = slots - vq->vq_free_cnt; 1146 1147 /* Positive value indicates it need free vring descriptors */ 1148 if (unlikely(need > 0)) { 1149 nb_used = VIRTQUEUE_NUSED(vq); 1150 virtio_rmb(); 1151 need = RTE_MIN(need, (int)nb_used); 1152 1153 virtio_xmit_cleanup(vq, need); 1154 need = slots - vq->vq_free_cnt; 1155 if (unlikely(need > 0)) { 1156 PMD_TX_LOG(ERR, 1157 "No free tx descriptors to transmit"); 1158 break; 1159 } 1160 } 1161 1162 /* Enqueue Packet buffers */ 1163 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); 1164 1165 txvq->stats.bytes += txm->pkt_len; 1166 virtio_update_packet_stats(&txvq->stats, txm); 1167 } 1168 1169 txvq->stats.packets += nb_tx; 1170 1171 if (likely(nb_tx)) { 1172 vq_update_avail_idx(vq); 1173 1174 if (unlikely(virtqueue_kick_prepare(vq))) { 1175 virtqueue_notify(vq); 1176 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 1177 } 1178 } 1179 1180 return nb_tx; 1181 } 1182