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 if (use_indirect) 275 idx = txvq->vq_ring.desc[head_idx].next; 276 277 txvq->vq_desc_head_idx = idx; 278 if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 279 txvq->vq_desc_tail_idx = idx; 280 txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed); 281 vq_update_avail_ring(txvq, head_idx); 282 } 283 284 static void 285 virtio_dev_vring_start(struct virtqueue *vq, int queue_type) 286 { 287 struct rte_mbuf *m; 288 int i, nbufs, error, size = vq->vq_nentries; 289 struct vring *vr = &vq->vq_ring; 290 uint8_t *ring_mem = vq->vq_ring_virt_mem; 291 292 PMD_INIT_FUNC_TRACE(); 293 294 /* 295 * Reinitialise since virtio port might have been stopped and restarted 296 */ 297 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size); 298 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); 299 vq->vq_used_cons_idx = 0; 300 vq->vq_desc_head_idx = 0; 301 vq->vq_avail_idx = 0; 302 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1); 303 vq->vq_free_cnt = vq->vq_nentries; 304 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); 305 306 vring_desc_init(vr->desc, size); 307 308 /* 309 * Disable device(host) interrupting guest 310 */ 311 virtqueue_disable_intr(vq); 312 313 /* Only rx virtqueue needs mbufs to be allocated at initialization */ 314 if (queue_type == VTNET_RQ) { 315 if (vq->mpool == NULL) 316 rte_exit(EXIT_FAILURE, 317 "Cannot allocate initial mbufs for rx virtqueue"); 318 319 /* Allocate blank mbufs for the each rx descriptor */ 320 nbufs = 0; 321 error = ENOSPC; 322 323 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 324 if (use_simple_rxtx) 325 for (i = 0; i < vq->vq_nentries; i++) { 326 vq->vq_ring.avail->ring[i] = i; 327 vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE; 328 } 329 #endif 330 memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf)); 331 for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++) 332 vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf; 333 334 while (!virtqueue_full(vq)) { 335 m = rte_mbuf_raw_alloc(vq->mpool); 336 if (m == NULL) 337 break; 338 339 /****************************************** 340 * Enqueue allocated buffers * 341 *******************************************/ 342 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 343 if (use_simple_rxtx) 344 error = virtqueue_enqueue_recv_refill_simple(vq, m); 345 else 346 #endif 347 error = virtqueue_enqueue_recv_refill(vq, m); 348 if (error) { 349 rte_pktmbuf_free(m); 350 break; 351 } 352 nbufs++; 353 } 354 355 vq_update_avail_idx(vq); 356 357 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 358 } else if (queue_type == VTNET_TQ) { 359 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 360 if (use_simple_rxtx) { 361 int mid_idx = vq->vq_nentries >> 1; 362 for (i = 0; i < mid_idx; i++) { 363 vq->vq_ring.avail->ring[i] = i + mid_idx; 364 vq->vq_ring.desc[i + mid_idx].next = i; 365 vq->vq_ring.desc[i + mid_idx].addr = 366 vq->virtio_net_hdr_mem + 367 offsetof(struct virtio_tx_region, tx_hdr); 368 vq->vq_ring.desc[i + mid_idx].len = 369 vq->hw->vtnet_hdr_size; 370 vq->vq_ring.desc[i + mid_idx].flags = 371 VRING_DESC_F_NEXT; 372 vq->vq_ring.desc[i].flags = 0; 373 } 374 for (i = mid_idx; i < vq->vq_nentries; i++) 375 vq->vq_ring.avail->ring[i] = i; 376 } 377 #endif 378 } 379 } 380 381 void 382 virtio_dev_cq_start(struct rte_eth_dev *dev) 383 { 384 struct virtio_hw *hw = dev->data->dev_private; 385 386 if (hw->cvq) { 387 virtio_dev_vring_start(hw->cvq, VTNET_CQ); 388 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq); 389 } 390 } 391 392 void 393 virtio_dev_rxtx_start(struct rte_eth_dev *dev) 394 { 395 /* 396 * Start receive and transmit vrings 397 * - Setup vring structure for all queues 398 * - Initialize descriptor for the rx vring 399 * - Allocate blank mbufs for the each rx descriptor 400 * 401 */ 402 int i; 403 404 PMD_INIT_FUNC_TRACE(); 405 406 /* Start rx vring. */ 407 for (i = 0; i < dev->data->nb_rx_queues; i++) { 408 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ); 409 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]); 410 } 411 412 /* Start tx vring. */ 413 for (i = 0; i < dev->data->nb_tx_queues; i++) { 414 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ); 415 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]); 416 } 417 } 418 419 int 420 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, 421 uint16_t queue_idx, 422 uint16_t nb_desc, 423 unsigned int socket_id, 424 __rte_unused const struct rte_eth_rxconf *rx_conf, 425 struct rte_mempool *mp) 426 { 427 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 428 struct virtqueue *vq; 429 int ret; 430 431 PMD_INIT_FUNC_TRACE(); 432 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx, 433 nb_desc, socket_id, &vq); 434 if (ret < 0) { 435 PMD_INIT_LOG(ERR, "rvq initialization failed"); 436 return ret; 437 } 438 439 /* Create mempool for rx mbuf allocation */ 440 vq->mpool = mp; 441 442 dev->data->rx_queues[queue_idx] = vq; 443 444 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 445 virtio_rxq_vec_setup(vq); 446 #endif 447 448 return 0; 449 } 450 451 void 452 virtio_dev_rx_queue_release(void *rxq) 453 { 454 virtio_dev_queue_release(rxq); 455 } 456 457 /* 458 * struct rte_eth_dev *dev: Used to update dev 459 * uint16_t nb_desc: Defaults to values read from config space 460 * unsigned int socket_id: Used to allocate memzone 461 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 462 * uint16_t queue_idx: Just used as an index in dev txq list 463 */ 464 int 465 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 466 uint16_t queue_idx, 467 uint16_t nb_desc, 468 unsigned int socket_id, 469 const struct rte_eth_txconf *tx_conf) 470 { 471 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 472 473 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 474 struct virtio_hw *hw = dev->data->dev_private; 475 #endif 476 struct virtqueue *vq; 477 uint16_t tx_free_thresh; 478 int ret; 479 480 PMD_INIT_FUNC_TRACE(); 481 482 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS) 483 != ETH_TXQ_FLAGS_NOXSUMS) { 484 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n"); 485 return -EINVAL; 486 } 487 488 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 489 /* Use simple rx/tx func if single segment and no offloads */ 490 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS && 491 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { 492 PMD_INIT_LOG(INFO, "Using simple rx/tx path"); 493 dev->tx_pkt_burst = virtio_xmit_pkts_simple; 494 dev->rx_pkt_burst = virtio_recv_pkts_vec; 495 use_simple_rxtx = 1; 496 } 497 #endif 498 499 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx, 500 nb_desc, socket_id, &vq); 501 if (ret < 0) { 502 PMD_INIT_LOG(ERR, "rvq initialization failed"); 503 return ret; 504 } 505 506 tx_free_thresh = tx_conf->tx_free_thresh; 507 if (tx_free_thresh == 0) 508 tx_free_thresh = 509 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 510 511 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 512 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 513 "number of TX entries minus 3 (%u)." 514 " (tx_free_thresh=%u port=%u queue=%u)\n", 515 vq->vq_nentries - 3, 516 tx_free_thresh, dev->data->port_id, queue_idx); 517 return -EINVAL; 518 } 519 520 vq->vq_free_thresh = tx_free_thresh; 521 522 dev->data->tx_queues[queue_idx] = vq; 523 return 0; 524 } 525 526 void 527 virtio_dev_tx_queue_release(void *txq) 528 { 529 virtio_dev_queue_release(txq); 530 } 531 532 static void 533 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 534 { 535 int error; 536 /* 537 * Requeue the discarded mbuf. This should always be 538 * successful since it was just dequeued. 539 */ 540 error = virtqueue_enqueue_recv_refill(vq, m); 541 if (unlikely(error)) { 542 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 543 rte_pktmbuf_free(m); 544 } 545 } 546 547 static void 548 virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf) 549 { 550 uint32_t s = mbuf->pkt_len; 551 struct ether_addr *ea; 552 553 if (s == 64) { 554 vq->size_bins[1]++; 555 } else if (s > 64 && s < 1024) { 556 uint32_t bin; 557 558 /* count zeros, and offset into correct bin */ 559 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 560 vq->size_bins[bin]++; 561 } else { 562 if (s < 64) 563 vq->size_bins[0]++; 564 else if (s < 1519) 565 vq->size_bins[6]++; 566 else if (s >= 1519) 567 vq->size_bins[7]++; 568 } 569 570 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 571 if (is_multicast_ether_addr(ea)) { 572 if (is_broadcast_ether_addr(ea)) 573 vq->broadcast++; 574 else 575 vq->multicast++; 576 } 577 } 578 579 #define VIRTIO_MBUF_BURST_SZ 64 580 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 581 uint16_t 582 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 583 { 584 struct virtqueue *rxvq = rx_queue; 585 struct virtio_hw *hw; 586 struct rte_mbuf *rxm, *new_mbuf; 587 uint16_t nb_used, num, nb_rx; 588 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 589 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 590 int error; 591 uint32_t i, nb_enqueued; 592 uint32_t hdr_size; 593 594 nb_used = VIRTQUEUE_NUSED(rxvq); 595 596 virtio_rmb(); 597 598 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts); 599 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ); 600 if (likely(num > DESC_PER_CACHELINE)) 601 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 602 603 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num); 604 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 605 606 hw = rxvq->hw; 607 nb_rx = 0; 608 nb_enqueued = 0; 609 hdr_size = hw->vtnet_hdr_size; 610 611 for (i = 0; i < num ; i++) { 612 rxm = rcv_pkts[i]; 613 614 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 615 616 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 617 PMD_RX_LOG(ERR, "Packet drop"); 618 nb_enqueued++; 619 virtio_discard_rxbuf(rxvq, rxm); 620 rxvq->errors++; 621 continue; 622 } 623 624 rxm->port = rxvq->port_id; 625 rxm->data_off = RTE_PKTMBUF_HEADROOM; 626 rxm->ol_flags = 0; 627 rxm->vlan_tci = 0; 628 629 rxm->nb_segs = 1; 630 rxm->next = NULL; 631 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 632 rxm->data_len = (uint16_t)(len[i] - hdr_size); 633 634 if (hw->vlan_strip) 635 rte_vlan_strip(rxm); 636 637 VIRTIO_DUMP_PACKET(rxm, rxm->data_len); 638 639 rx_pkts[nb_rx++] = rxm; 640 641 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len; 642 virtio_update_packet_stats(rxvq, rxm); 643 } 644 645 rxvq->packets += nb_rx; 646 647 /* Allocate new mbuf for the used descriptor */ 648 error = ENOSPC; 649 while (likely(!virtqueue_full(rxvq))) { 650 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 651 if (unlikely(new_mbuf == NULL)) { 652 struct rte_eth_dev *dev 653 = &rte_eth_devices[rxvq->port_id]; 654 dev->data->rx_mbuf_alloc_failed++; 655 break; 656 } 657 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); 658 if (unlikely(error)) { 659 rte_pktmbuf_free(new_mbuf); 660 break; 661 } 662 nb_enqueued++; 663 } 664 665 if (likely(nb_enqueued)) { 666 vq_update_avail_idx(rxvq); 667 668 if (unlikely(virtqueue_kick_prepare(rxvq))) { 669 virtqueue_notify(rxvq); 670 PMD_RX_LOG(DEBUG, "Notified"); 671 } 672 } 673 674 return nb_rx; 675 } 676 677 uint16_t 678 virtio_recv_mergeable_pkts(void *rx_queue, 679 struct rte_mbuf **rx_pkts, 680 uint16_t nb_pkts) 681 { 682 struct virtqueue *rxvq = rx_queue; 683 struct virtio_hw *hw; 684 struct rte_mbuf *rxm, *new_mbuf; 685 uint16_t nb_used, num, nb_rx; 686 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 687 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 688 struct rte_mbuf *prev; 689 int error; 690 uint32_t i, nb_enqueued; 691 uint32_t seg_num; 692 uint16_t extra_idx; 693 uint32_t seg_res; 694 uint32_t hdr_size; 695 696 nb_used = VIRTQUEUE_NUSED(rxvq); 697 698 virtio_rmb(); 699 700 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 701 702 hw = rxvq->hw; 703 nb_rx = 0; 704 i = 0; 705 nb_enqueued = 0; 706 seg_num = 0; 707 extra_idx = 0; 708 seg_res = 0; 709 hdr_size = hw->vtnet_hdr_size; 710 711 while (i < nb_used) { 712 struct virtio_net_hdr_mrg_rxbuf *header; 713 714 if (nb_rx == nb_pkts) 715 break; 716 717 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1); 718 if (num != 1) 719 continue; 720 721 i++; 722 723 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 724 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]); 725 726 rxm = rcv_pkts[0]; 727 728 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 729 PMD_RX_LOG(ERR, "Packet drop"); 730 nb_enqueued++; 731 virtio_discard_rxbuf(rxvq, rxm); 732 rxvq->errors++; 733 continue; 734 } 735 736 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 737 RTE_PKTMBUF_HEADROOM - hdr_size); 738 seg_num = header->num_buffers; 739 740 if (seg_num == 0) 741 seg_num = 1; 742 743 rxm->data_off = RTE_PKTMBUF_HEADROOM; 744 rxm->nb_segs = seg_num; 745 rxm->next = NULL; 746 rxm->ol_flags = 0; 747 rxm->vlan_tci = 0; 748 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 749 rxm->data_len = (uint16_t)(len[0] - hdr_size); 750 751 rxm->port = rxvq->port_id; 752 rx_pkts[nb_rx] = rxm; 753 prev = rxm; 754 755 seg_res = seg_num - 1; 756 757 while (seg_res != 0) { 758 /* 759 * Get extra segments for current uncompleted packet. 760 */ 761 uint16_t rcv_cnt = 762 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 763 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) { 764 uint32_t rx_num = 765 virtqueue_dequeue_burst_rx(rxvq, 766 rcv_pkts, len, rcv_cnt); 767 i += rx_num; 768 rcv_cnt = rx_num; 769 } else { 770 PMD_RX_LOG(ERR, 771 "No enough segments for packet."); 772 nb_enqueued++; 773 virtio_discard_rxbuf(rxvq, rxm); 774 rxvq->errors++; 775 break; 776 } 777 778 extra_idx = 0; 779 780 while (extra_idx < rcv_cnt) { 781 rxm = rcv_pkts[extra_idx]; 782 783 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 784 rxm->next = NULL; 785 rxm->pkt_len = (uint32_t)(len[extra_idx]); 786 rxm->data_len = (uint16_t)(len[extra_idx]); 787 788 if (prev) 789 prev->next = rxm; 790 791 prev = rxm; 792 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 793 extra_idx++; 794 }; 795 seg_res -= rcv_cnt; 796 } 797 798 if (hw->vlan_strip) 799 rte_vlan_strip(rx_pkts[nb_rx]); 800 801 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 802 rx_pkts[nb_rx]->data_len); 803 804 rxvq->bytes += rx_pkts[nb_rx]->pkt_len; 805 virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]); 806 nb_rx++; 807 } 808 809 rxvq->packets += nb_rx; 810 811 /* Allocate new mbuf for the used descriptor */ 812 error = ENOSPC; 813 while (likely(!virtqueue_full(rxvq))) { 814 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 815 if (unlikely(new_mbuf == NULL)) { 816 struct rte_eth_dev *dev 817 = &rte_eth_devices[rxvq->port_id]; 818 dev->data->rx_mbuf_alloc_failed++; 819 break; 820 } 821 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf); 822 if (unlikely(error)) { 823 rte_pktmbuf_free(new_mbuf); 824 break; 825 } 826 nb_enqueued++; 827 } 828 829 if (likely(nb_enqueued)) { 830 vq_update_avail_idx(rxvq); 831 832 if (unlikely(virtqueue_kick_prepare(rxvq))) { 833 virtqueue_notify(rxvq); 834 PMD_RX_LOG(DEBUG, "Notified"); 835 } 836 } 837 838 return nb_rx; 839 } 840 841 uint16_t 842 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 843 { 844 struct virtqueue *txvq = tx_queue; 845 struct virtio_hw *hw = txvq->hw; 846 uint16_t hdr_size = hw->vtnet_hdr_size; 847 uint16_t nb_used, nb_tx; 848 int error; 849 850 if (unlikely(nb_pkts < 1)) 851 return nb_pkts; 852 853 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 854 nb_used = VIRTQUEUE_NUSED(txvq); 855 856 virtio_rmb(); 857 if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh)) 858 virtio_xmit_cleanup(txvq, nb_used); 859 860 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 861 struct rte_mbuf *txm = tx_pkts[nb_tx]; 862 int can_push = 0, use_indirect = 0, slots, need; 863 864 /* Do VLAN tag insertion */ 865 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 866 error = rte_vlan_insert(&txm); 867 if (unlikely(error)) { 868 rte_pktmbuf_free(txm); 869 continue; 870 } 871 } 872 873 /* optimize ring usage */ 874 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) && 875 rte_mbuf_refcnt_read(txm) == 1 && 876 txm->nb_segs == 1 && 877 rte_pktmbuf_headroom(txm) >= hdr_size && 878 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 879 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 880 can_push = 1; 881 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 882 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 883 use_indirect = 1; 884 885 /* How many main ring entries are needed to this Tx? 886 * any_layout => number of segments 887 * indirect => 1 888 * default => number of segments + 1 889 */ 890 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 891 need = slots - txvq->vq_free_cnt; 892 893 /* Positive value indicates it need free vring descriptors */ 894 if (unlikely(need > 0)) { 895 nb_used = VIRTQUEUE_NUSED(txvq); 896 virtio_rmb(); 897 need = RTE_MIN(need, (int)nb_used); 898 899 virtio_xmit_cleanup(txvq, need); 900 need = slots - txvq->vq_free_cnt; 901 if (unlikely(need > 0)) { 902 PMD_TX_LOG(ERR, 903 "No free tx descriptors to transmit"); 904 break; 905 } 906 } 907 908 /* Enqueue Packet buffers */ 909 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); 910 911 txvq->bytes += txm->pkt_len; 912 virtio_update_packet_stats(txvq, txm); 913 } 914 915 txvq->packets += nb_tx; 916 917 if (likely(nb_tx)) { 918 vq_update_avail_idx(txvq); 919 920 if (unlikely(virtqueue_kick_prepare(txvq))) { 921 virtqueue_notify(txvq); 922 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 923 } 924 } 925 926 return nb_tx; 927 } 928