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 54 #include "virtio_logs.h" 55 #include "virtio_ethdev.h" 56 #include "virtio_pci.h" 57 #include "virtqueue.h" 58 #include "virtio_rxtx.h" 59 60 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP 61 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len) 62 #else 63 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0) 64 #endif 65 66 67 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \ 68 ETH_TXQ_FLAGS_NOOFFLOADS) 69 70 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 71 static int use_simple_rxtx; 72 #endif 73 74 static void 75 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) 76 { 77 struct vring_desc *dp, *dp_tail; 78 struct vq_desc_extra *dxp; 79 uint16_t desc_idx_last = desc_idx; 80 81 dp = &vq->vq_ring.desc[desc_idx]; 82 dxp = &vq->vq_descx[desc_idx]; 83 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs); 84 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) { 85 while (dp->flags & VRING_DESC_F_NEXT) { 86 desc_idx_last = dp->next; 87 dp = &vq->vq_ring.desc[dp->next]; 88 } 89 } 90 dxp->ndescs = 0; 91 92 /* 93 * We must append the existing free chain, if any, to the end of 94 * newly freed chain. If the virtqueue was completely used, then 95 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above). 96 */ 97 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) { 98 vq->vq_desc_head_idx = desc_idx; 99 } else { 100 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx]; 101 dp_tail->next = desc_idx; 102 } 103 104 vq->vq_desc_tail_idx = desc_idx_last; 105 dp->next = VQ_RING_DESC_CHAIN_END; 106 } 107 108 static uint16_t 109 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, 110 uint32_t *len, uint16_t num) 111 { 112 struct vring_used_elem *uep; 113 struct rte_mbuf *cookie; 114 uint16_t used_idx, desc_idx; 115 uint16_t i; 116 117 /* Caller does the check */ 118 for (i = 0; i < num ; i++) { 119 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 120 uep = &vq->vq_ring.used->ring[used_idx]; 121 desc_idx = (uint16_t) uep->id; 122 len[i] = uep->len; 123 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie; 124 125 if (unlikely(cookie == NULL)) { 126 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n", 127 vq->vq_used_cons_idx); 128 break; 129 } 130 131 rte_prefetch0(cookie); 132 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); 133 rx_pkts[i] = cookie; 134 vq->vq_used_cons_idx++; 135 vq_ring_free_chain(vq, desc_idx); 136 vq->vq_descx[desc_idx].cookie = NULL; 137 } 138 139 return i; 140 } 141 142 #ifndef DEFAULT_TX_FREE_THRESH 143 #define DEFAULT_TX_FREE_THRESH 32 144 #endif 145 146 /* Cleanup from completed transmits. */ 147 static void 148 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) 149 { 150 uint16_t i, used_idx, desc_idx; 151 for (i = 0; i < num; i++) { 152 struct vring_used_elem *uep; 153 struct vq_desc_extra *dxp; 154 155 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 156 uep = &vq->vq_ring.used->ring[used_idx]; 157 158 desc_idx = (uint16_t) uep->id; 159 dxp = &vq->vq_descx[desc_idx]; 160 vq->vq_used_cons_idx++; 161 vq_ring_free_chain(vq, desc_idx); 162 163 if (dxp->cookie != NULL) { 164 rte_pktmbuf_free(dxp->cookie); 165 dxp->cookie = NULL; 166 } 167 } 168 } 169 170 171 static inline int 172 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) 173 { 174 struct vq_desc_extra *dxp; 175 struct virtio_hw *hw = vq->hw; 176 struct vring_desc *start_dp; 177 uint16_t needed = 1; 178 uint16_t head_idx, idx; 179 180 if (unlikely(vq->vq_free_cnt == 0)) 181 return -ENOSPC; 182 if (unlikely(vq->vq_free_cnt < needed)) 183 return -EMSGSIZE; 184 185 head_idx = vq->vq_desc_head_idx; 186 if (unlikely(head_idx >= vq->vq_nentries)) 187 return -EFAULT; 188 189 idx = head_idx; 190 dxp = &vq->vq_descx[idx]; 191 dxp->cookie = (void *)cookie; 192 dxp->ndescs = needed; 193 194 start_dp = vq->vq_ring.desc; 195 start_dp[idx].addr = 196 (uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM 197 - hw->vtnet_hdr_size); 198 start_dp[idx].len = 199 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size; 200 start_dp[idx].flags = VRING_DESC_F_WRITE; 201 idx = start_dp[idx].next; 202 vq->vq_desc_head_idx = idx; 203 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 204 vq->vq_desc_tail_idx = idx; 205 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 206 vq_update_avail_ring(vq, head_idx); 207 208 return 0; 209 } 210 211 static inline void 212 virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie, 213 uint16_t needed, int use_indirect, int can_push) 214 { 215 struct vq_desc_extra *dxp; 216 struct vring_desc *start_dp; 217 uint16_t seg_num = cookie->nb_segs; 218 uint16_t head_idx, idx; 219 uint16_t head_size = txvq->hw->vtnet_hdr_size; 220 unsigned long offs; 221 222 head_idx = txvq->vq_desc_head_idx; 223 idx = head_idx; 224 dxp = &txvq->vq_descx[idx]; 225 dxp->cookie = (void *)cookie; 226 dxp->ndescs = needed; 227 228 start_dp = txvq->vq_ring.desc; 229 230 if (can_push) { 231 /* put on zero'd transmit header (no offloads) */ 232 void *hdr = rte_pktmbuf_prepend(cookie, head_size); 233 234 memset(hdr, 0, head_size); 235 } else if (use_indirect) { 236 /* setup tx ring slot to point to indirect 237 * descriptor list stored in reserved region. 238 * 239 * the first slot in indirect ring is already preset 240 * to point to the header in reserved region 241 */ 242 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; 243 244 offs = idx * sizeof(struct virtio_tx_region) 245 + offsetof(struct virtio_tx_region, tx_indir); 246 247 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs; 248 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc); 249 start_dp[idx].flags = VRING_DESC_F_INDIRECT; 250 251 /* loop below will fill in rest of the indirect elements */ 252 start_dp = txr[idx].tx_indir; 253 idx = 1; 254 } else { 255 /* setup first tx ring slot to point to header 256 * stored in reserved region. 257 */ 258 offs = idx * sizeof(struct virtio_tx_region) 259 + offsetof(struct virtio_tx_region, tx_hdr); 260 261 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs; 262 start_dp[idx].len = txvq->hw->vtnet_hdr_size; 263 start_dp[idx].flags = VRING_DESC_F_NEXT; 264 idx = start_dp[idx].next; 265 } 266 267 do { 268 start_dp[idx].addr = rte_mbuf_data_dma_addr(cookie); 269 start_dp[idx].len = cookie->data_len; 270 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0; 271 idx = start_dp[idx].next; 272 } while ((cookie = cookie->next) != NULL); 273 274 start_dp[idx].flags &= ~VRING_DESC_F_NEXT; 275 276 if (use_indirect) 277 idx = txvq->vq_ring.desc[head_idx].next; 278 279 txvq->vq_desc_head_idx = idx; 280 if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 281 txvq->vq_desc_tail_idx = idx; 282 txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed); 283 vq_update_avail_ring(txvq, head_idx); 284 } 285 286 static inline struct rte_mbuf * 287 rte_rxmbuf_alloc(struct rte_mempool *mp) 288 { 289 struct rte_mbuf *m; 290 291 m = __rte_mbuf_raw_alloc(mp); 292 __rte_mbuf_sanity_check_raw(m, 0); 293 294 return m; 295 } 296 297 static void 298 virtio_dev_vring_start(struct virtqueue *vq, int queue_type) 299 { 300 struct rte_mbuf *m; 301 int i, nbufs, error, size = vq->vq_nentries; 302 struct vring *vr = &vq->vq_ring; 303 uint8_t *ring_mem = vq->vq_ring_virt_mem; 304 305 PMD_INIT_FUNC_TRACE(); 306 307 /* 308 * Reinitialise since virtio port might have been stopped and restarted 309 */ 310 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size); 311 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); 312 vq->vq_used_cons_idx = 0; 313 vq->vq_desc_head_idx = 0; 314 vq->vq_avail_idx = 0; 315 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1); 316 vq->vq_free_cnt = vq->vq_nentries; 317 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); 318 319 vring_desc_init(vr->desc, size); 320 321 /* 322 * Disable device(host) interrupting guest 323 */ 324 virtqueue_disable_intr(vq); 325 326 /* Only rx virtqueue needs mbufs to be allocated at initialization */ 327 if (queue_type == VTNET_RQ) { 328 if (vq->mpool == NULL) 329 rte_exit(EXIT_FAILURE, 330 "Cannot allocate initial mbufs for rx virtqueue"); 331 332 /* Allocate blank mbufs for the each rx descriptor */ 333 nbufs = 0; 334 error = ENOSPC; 335 336 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 337 if (use_simple_rxtx) 338 for (i = 0; i < vq->vq_nentries; i++) { 339 vq->vq_ring.avail->ring[i] = i; 340 vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE; 341 } 342 #endif 343 memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf)); 344 for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++) 345 vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf; 346 347 while (!virtqueue_full(vq)) { 348 m = rte_rxmbuf_alloc(vq->mpool); 349 if (m == NULL) 350 break; 351 352 /****************************************** 353 * Enqueue allocated buffers * 354 *******************************************/ 355 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 356 if (use_simple_rxtx) 357 error = virtqueue_enqueue_recv_refill_simple(vq, m); 358 else 359 #endif 360 error = virtqueue_enqueue_recv_refill(vq, m); 361 if (error) { 362 rte_pktmbuf_free(m); 363 break; 364 } 365 nbufs++; 366 } 367 368 vq_update_avail_idx(vq); 369 370 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 371 } else if (queue_type == VTNET_TQ) { 372 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 373 if (use_simple_rxtx) { 374 int mid_idx = vq->vq_nentries >> 1; 375 for (i = 0; i < mid_idx; i++) { 376 vq->vq_ring.avail->ring[i] = i + mid_idx; 377 vq->vq_ring.desc[i + mid_idx].next = i; 378 vq->vq_ring.desc[i + mid_idx].addr = 379 vq->virtio_net_hdr_mem + 380 i * vq->hw->vtnet_hdr_size; 381 vq->vq_ring.desc[i + mid_idx].len = 382 vq->hw->vtnet_hdr_size; 383 vq->vq_ring.desc[i + mid_idx].flags = 384 VRING_DESC_F_NEXT; 385 vq->vq_ring.desc[i].flags = 0; 386 } 387 for (i = mid_idx; i < vq->vq_nentries; i++) 388 vq->vq_ring.avail->ring[i] = i; 389 } 390 #endif 391 } 392 } 393 394 void 395 virtio_dev_cq_start(struct rte_eth_dev *dev) 396 { 397 struct virtio_hw *hw = dev->data->dev_private; 398 399 if (hw->cvq) { 400 virtio_dev_vring_start(hw->cvq, VTNET_CQ); 401 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq); 402 } 403 } 404 405 void 406 virtio_dev_rxtx_start(struct rte_eth_dev *dev) 407 { 408 /* 409 * Start receive and transmit vrings 410 * - Setup vring structure for all queues 411 * - Initialize descriptor for the rx vring 412 * - Allocate blank mbufs for the each rx descriptor 413 * 414 */ 415 int i; 416 417 PMD_INIT_FUNC_TRACE(); 418 419 /* Start rx vring. */ 420 for (i = 0; i < dev->data->nb_rx_queues; i++) { 421 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ); 422 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]); 423 } 424 425 /* Start tx vring. */ 426 for (i = 0; i < dev->data->nb_tx_queues; i++) { 427 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ); 428 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]); 429 } 430 } 431 432 int 433 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, 434 uint16_t queue_idx, 435 uint16_t nb_desc, 436 unsigned int socket_id, 437 __rte_unused const struct rte_eth_rxconf *rx_conf, 438 struct rte_mempool *mp) 439 { 440 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 441 struct virtqueue *vq; 442 int ret; 443 444 PMD_INIT_FUNC_TRACE(); 445 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx, 446 nb_desc, socket_id, &vq); 447 if (ret < 0) { 448 PMD_INIT_LOG(ERR, "rvq initialization failed"); 449 return ret; 450 } 451 452 /* Create mempool for rx mbuf allocation */ 453 vq->mpool = mp; 454 455 dev->data->rx_queues[queue_idx] = vq; 456 457 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 458 virtio_rxq_vec_setup(vq); 459 #endif 460 461 return 0; 462 } 463 464 void 465 virtio_dev_rx_queue_release(void *rxq) 466 { 467 virtio_dev_queue_release(rxq); 468 } 469 470 /* 471 * struct rte_eth_dev *dev: Used to update dev 472 * uint16_t nb_desc: Defaults to values read from config space 473 * unsigned int socket_id: Used to allocate memzone 474 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 475 * uint16_t queue_idx: Just used as an index in dev txq list 476 */ 477 int 478 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 479 uint16_t queue_idx, 480 uint16_t nb_desc, 481 unsigned int socket_id, 482 const struct rte_eth_txconf *tx_conf) 483 { 484 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 485 486 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 487 struct virtio_hw *hw = dev->data->dev_private; 488 #endif 489 struct virtqueue *vq; 490 uint16_t tx_free_thresh; 491 int ret; 492 493 PMD_INIT_FUNC_TRACE(); 494 495 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS) 496 != ETH_TXQ_FLAGS_NOXSUMS) { 497 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n"); 498 return -EINVAL; 499 } 500 501 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 502 /* Use simple rx/tx func if single segment and no offloads */ 503 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS && 504 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { 505 PMD_INIT_LOG(INFO, "Using simple rx/tx path"); 506 dev->tx_pkt_burst = virtio_xmit_pkts_simple; 507 dev->rx_pkt_burst = virtio_recv_pkts_vec; 508 use_simple_rxtx = 1; 509 } 510 #endif 511 512 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx, 513 nb_desc, socket_id, &vq); 514 if (ret < 0) { 515 PMD_INIT_LOG(ERR, "rvq initialization failed"); 516 return ret; 517 } 518 519 tx_free_thresh = tx_conf->tx_free_thresh; 520 if (tx_free_thresh == 0) 521 tx_free_thresh = 522 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 523 524 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 525 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 526 "number of TX entries minus 3 (%u)." 527 " (tx_free_thresh=%u port=%u queue=%u)\n", 528 vq->vq_nentries - 3, 529 tx_free_thresh, dev->data->port_id, queue_idx); 530 return -EINVAL; 531 } 532 533 vq->vq_free_thresh = tx_free_thresh; 534 535 dev->data->tx_queues[queue_idx] = vq; 536 return 0; 537 } 538 539 void 540 virtio_dev_tx_queue_release(void *txq) 541 { 542 virtio_dev_queue_release(txq); 543 } 544 545 static void 546 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 547 { 548 int error; 549 /* 550 * Requeue the discarded mbuf. This should always be 551 * successful since it was just dequeued. 552 */ 553 error = virtqueue_enqueue_recv_refill(vq, m); 554 if (unlikely(error)) { 555 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 556 rte_pktmbuf_free(m); 557 } 558 } 559 560 static void 561 virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf) 562 { 563 uint32_t s = mbuf->pkt_len; 564 struct ether_addr *ea; 565 566 if (s == 64) { 567 vq->size_bins[1]++; 568 } else if (s > 64 && s < 1024) { 569 uint32_t bin; 570 571 /* count zeros, and offset into correct bin */ 572 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 573 vq->size_bins[bin]++; 574 } else { 575 if (s < 64) 576 vq->size_bins[0]++; 577 else if (s < 1519) 578 vq->size_bins[6]++; 579 else if (s >= 1519) 580 vq->size_bins[7]++; 581 } 582 583 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 584 if (is_multicast_ether_addr(ea)) { 585 if (is_broadcast_ether_addr(ea)) 586 vq->broadcast++; 587 else 588 vq->multicast++; 589 } 590 } 591 592 #define VIRTIO_MBUF_BURST_SZ 64 593 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 594 uint16_t 595 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 596 { 597 struct virtqueue *rxvq = rx_queue; 598 struct virtio_hw *hw; 599 struct rte_mbuf *rxm, *new_mbuf; 600 uint16_t nb_used, num, nb_rx; 601 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 602 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 603 int error; 604 uint32_t i, nb_enqueued; 605 uint32_t hdr_size; 606 607 nb_used = VIRTQUEUE_NUSED(rxvq); 608 609 virtio_rmb(); 610 611 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts); 612 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ); 613 if (likely(num > DESC_PER_CACHELINE)) 614 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 615 616 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num); 617 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 618 619 hw = rxvq->hw; 620 nb_rx = 0; 621 nb_enqueued = 0; 622 hdr_size = hw->vtnet_hdr_size; 623 624 for (i = 0; i < num ; i++) { 625 rxm = rcv_pkts[i]; 626 627 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 628 629 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 630 PMD_RX_LOG(ERR, "Packet drop"); 631 nb_enqueued++; 632 virtio_discard_rxbuf(rxvq, rxm); 633 rxvq->errors++; 634 continue; 635 } 636 637 rxm->port = rxvq->port_id; 638 rxm->data_off = RTE_PKTMBUF_HEADROOM; 639 rxm->ol_flags = 0; 640 rxm->vlan_tci = 0; 641 642 rxm->nb_segs = 1; 643 rxm->next = NULL; 644 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 645 rxm->data_len = (uint16_t)(len[i] - hdr_size); 646 647 if (hw->vlan_strip) 648 rte_vlan_strip(rxm); 649 650 VIRTIO_DUMP_PACKET(rxm, rxm->data_len); 651 652 rx_pkts[nb_rx++] = rxm; 653 654 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len; 655 virtio_update_packet_stats(rxvq, rxm); 656 } 657 658 rxvq->packets += nb_rx; 659 660 /* Allocate new mbuf for the used descriptor */ 661 error = ENOSPC; 662 while (likely(!virtqueue_full(rxvq))) { 663 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool); 664 if (unlikely(new_mbuf == NULL)) { 665 struct rte_eth_dev *dev 666 = &rte_eth_devices[rxvq->port_id]; 667 dev->data->rx_mbuf_alloc_failed++; 668 break; 669 } 670 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); 671 if (unlikely(error)) { 672 rte_pktmbuf_free(new_mbuf); 673 break; 674 } 675 nb_enqueued++; 676 } 677 678 if (likely(nb_enqueued)) { 679 vq_update_avail_idx(rxvq); 680 681 if (unlikely(virtqueue_kick_prepare(rxvq))) { 682 virtqueue_notify(rxvq); 683 PMD_RX_LOG(DEBUG, "Notified\n"); 684 } 685 } 686 687 return nb_rx; 688 } 689 690 uint16_t 691 virtio_recv_mergeable_pkts(void *rx_queue, 692 struct rte_mbuf **rx_pkts, 693 uint16_t nb_pkts) 694 { 695 struct virtqueue *rxvq = rx_queue; 696 struct virtio_hw *hw; 697 struct rte_mbuf *rxm, *new_mbuf; 698 uint16_t nb_used, num, nb_rx; 699 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 700 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 701 struct rte_mbuf *prev; 702 int error; 703 uint32_t i, nb_enqueued; 704 uint32_t seg_num; 705 uint16_t extra_idx; 706 uint32_t seg_res; 707 uint32_t hdr_size; 708 709 nb_used = VIRTQUEUE_NUSED(rxvq); 710 711 virtio_rmb(); 712 713 PMD_RX_LOG(DEBUG, "used:%d\n", nb_used); 714 715 hw = rxvq->hw; 716 nb_rx = 0; 717 i = 0; 718 nb_enqueued = 0; 719 seg_num = 0; 720 extra_idx = 0; 721 seg_res = 0; 722 hdr_size = hw->vtnet_hdr_size; 723 724 while (i < nb_used) { 725 struct virtio_net_hdr_mrg_rxbuf *header; 726 727 if (nb_rx == nb_pkts) 728 break; 729 730 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1); 731 if (num != 1) 732 continue; 733 734 i++; 735 736 PMD_RX_LOG(DEBUG, "dequeue:%d\n", num); 737 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]); 738 739 rxm = rcv_pkts[0]; 740 741 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 742 PMD_RX_LOG(ERR, "Packet drop\n"); 743 nb_enqueued++; 744 virtio_discard_rxbuf(rxvq, rxm); 745 rxvq->errors++; 746 continue; 747 } 748 749 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 750 RTE_PKTMBUF_HEADROOM - hdr_size); 751 seg_num = header->num_buffers; 752 753 if (seg_num == 0) 754 seg_num = 1; 755 756 rxm->data_off = RTE_PKTMBUF_HEADROOM; 757 rxm->nb_segs = seg_num; 758 rxm->next = NULL; 759 rxm->ol_flags = 0; 760 rxm->vlan_tci = 0; 761 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 762 rxm->data_len = (uint16_t)(len[0] - hdr_size); 763 764 rxm->port = rxvq->port_id; 765 rx_pkts[nb_rx] = rxm; 766 prev = rxm; 767 768 seg_res = seg_num - 1; 769 770 while (seg_res != 0) { 771 /* 772 * Get extra segments for current uncompleted packet. 773 */ 774 uint16_t rcv_cnt = 775 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 776 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) { 777 uint32_t rx_num = 778 virtqueue_dequeue_burst_rx(rxvq, 779 rcv_pkts, len, rcv_cnt); 780 i += rx_num; 781 rcv_cnt = rx_num; 782 } else { 783 PMD_RX_LOG(ERR, 784 "No enough segments for packet.\n"); 785 nb_enqueued++; 786 virtio_discard_rxbuf(rxvq, rxm); 787 rxvq->errors++; 788 break; 789 } 790 791 extra_idx = 0; 792 793 while (extra_idx < rcv_cnt) { 794 rxm = rcv_pkts[extra_idx]; 795 796 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 797 rxm->next = NULL; 798 rxm->pkt_len = (uint32_t)(len[extra_idx]); 799 rxm->data_len = (uint16_t)(len[extra_idx]); 800 801 if (prev) 802 prev->next = rxm; 803 804 prev = rxm; 805 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 806 extra_idx++; 807 }; 808 seg_res -= rcv_cnt; 809 } 810 811 if (hw->vlan_strip) 812 rte_vlan_strip(rx_pkts[nb_rx]); 813 814 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 815 rx_pkts[nb_rx]->data_len); 816 817 rxvq->bytes += rx_pkts[nb_rx]->pkt_len; 818 virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]); 819 nb_rx++; 820 } 821 822 rxvq->packets += nb_rx; 823 824 /* Allocate new mbuf for the used descriptor */ 825 error = ENOSPC; 826 while (likely(!virtqueue_full(rxvq))) { 827 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool); 828 if (unlikely(new_mbuf == NULL)) { 829 struct rte_eth_dev *dev 830 = &rte_eth_devices[rxvq->port_id]; 831 dev->data->rx_mbuf_alloc_failed++; 832 break; 833 } 834 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); 835 if (unlikely(error)) { 836 rte_pktmbuf_free(new_mbuf); 837 break; 838 } 839 nb_enqueued++; 840 } 841 842 if (likely(nb_enqueued)) { 843 vq_update_avail_idx(rxvq); 844 845 if (unlikely(virtqueue_kick_prepare(rxvq))) { 846 virtqueue_notify(rxvq); 847 PMD_RX_LOG(DEBUG, "Notified"); 848 } 849 } 850 851 return nb_rx; 852 } 853 854 uint16_t 855 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 856 { 857 struct virtqueue *txvq = tx_queue; 858 struct virtio_hw *hw = txvq->hw; 859 uint16_t hdr_size = hw->vtnet_hdr_size; 860 uint16_t nb_used, nb_tx; 861 int error; 862 863 if (unlikely(nb_pkts < 1)) 864 return nb_pkts; 865 866 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 867 nb_used = VIRTQUEUE_NUSED(txvq); 868 869 virtio_rmb(); 870 if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh)) 871 virtio_xmit_cleanup(txvq, nb_used); 872 873 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 874 struct rte_mbuf *txm = tx_pkts[nb_tx]; 875 int can_push = 0, use_indirect = 0, slots, need; 876 877 /* Do VLAN tag insertion */ 878 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 879 error = rte_vlan_insert(&txm); 880 if (unlikely(error)) { 881 rte_pktmbuf_free(txm); 882 continue; 883 } 884 } 885 886 /* optimize ring usage */ 887 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) && 888 rte_mbuf_refcnt_read(txm) == 1 && 889 txm->nb_segs == 1 && 890 rte_pktmbuf_headroom(txm) >= hdr_size && 891 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 892 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 893 can_push = 1; 894 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 895 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 896 use_indirect = 1; 897 898 /* How many main ring entries are needed to this Tx? 899 * any_layout => number of segments 900 * indirect => 1 901 * default => number of segments + 1 902 */ 903 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 904 need = slots - txvq->vq_free_cnt; 905 906 /* Positive value indicates it need free vring descriptors */ 907 if (unlikely(need > 0)) { 908 nb_used = VIRTQUEUE_NUSED(txvq); 909 virtio_rmb(); 910 need = RTE_MIN(need, (int)nb_used); 911 912 virtio_xmit_cleanup(txvq, need); 913 need = slots - txvq->vq_free_cnt; 914 if (unlikely(need > 0)) { 915 PMD_TX_LOG(ERR, 916 "No free tx descriptors to transmit"); 917 break; 918 } 919 } 920 921 /* Enqueue Packet buffers */ 922 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); 923 924 txvq->bytes += txm->pkt_len; 925 virtio_update_packet_stats(txvq, txm); 926 } 927 928 txvq->packets += nb_tx; 929 930 if (likely(nb_tx)) { 931 vq_update_avail_idx(txvq); 932 933 if (unlikely(virtqueue_kick_prepare(txvq))) { 934 virtqueue_notify(txvq); 935 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 936 } 937 } 938 939 return nb_tx; 940 } 941