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 VIRTIO_MBUF_ADDR(cookie, vq) + 197 RTE_PKTMBUF_HEADROOM - 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 virtnet_tx *txvq, struct rte_mbuf *cookie, 213 uint16_t needed, int use_indirect, int can_push) 214 { 215 struct vq_desc_extra *dxp; 216 struct virtqueue *vq = txvq->vq; 217 struct vring_desc *start_dp; 218 uint16_t seg_num = cookie->nb_segs; 219 uint16_t head_idx, idx; 220 uint16_t head_size = vq->hw->vtnet_hdr_size; 221 unsigned long offs; 222 223 head_idx = vq->vq_desc_head_idx; 224 idx = head_idx; 225 dxp = &vq->vq_descx[idx]; 226 dxp->cookie = (void *)cookie; 227 dxp->ndescs = needed; 228 229 start_dp = vq->vq_ring.desc; 230 231 if (can_push) { 232 /* put on zero'd transmit header (no offloads) */ 233 void *hdr = rte_pktmbuf_prepend(cookie, head_size); 234 235 memset(hdr, 0, head_size); 236 } else if (use_indirect) { 237 /* setup tx ring slot to point to indirect 238 * descriptor list stored in reserved region. 239 * 240 * the first slot in indirect ring is already preset 241 * to point to the header in reserved region 242 */ 243 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; 244 245 offs = idx * sizeof(struct virtio_tx_region) 246 + offsetof(struct virtio_tx_region, tx_indir); 247 248 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs; 249 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc); 250 start_dp[idx].flags = VRING_DESC_F_INDIRECT; 251 252 /* loop below will fill in rest of the indirect elements */ 253 start_dp = txr[idx].tx_indir; 254 idx = 1; 255 } else { 256 /* setup first tx ring slot to point to header 257 * stored in reserved region. 258 */ 259 offs = idx * sizeof(struct virtio_tx_region) 260 + offsetof(struct virtio_tx_region, tx_hdr); 261 262 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs; 263 start_dp[idx].len = vq->hw->vtnet_hdr_size; 264 start_dp[idx].flags = VRING_DESC_F_NEXT; 265 idx = start_dp[idx].next; 266 } 267 268 do { 269 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); 270 start_dp[idx].len = cookie->data_len; 271 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0; 272 idx = start_dp[idx].next; 273 } while ((cookie = cookie->next) != NULL); 274 275 if (use_indirect) 276 idx = vq->vq_ring.desc[head_idx].next; 277 278 vq->vq_desc_head_idx = idx; 279 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 280 vq->vq_desc_tail_idx = idx; 281 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 282 vq_update_avail_ring(vq, head_idx); 283 } 284 285 static void 286 virtio_dev_vring_start(struct virtqueue *vq) 287 { 288 int 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 } 313 314 void 315 virtio_dev_cq_start(struct rte_eth_dev *dev) 316 { 317 struct virtio_hw *hw = dev->data->dev_private; 318 319 if (hw->cvq && hw->cvq->vq) { 320 virtio_dev_vring_start(hw->cvq->vq); 321 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq); 322 } 323 } 324 325 void 326 virtio_dev_rxtx_start(struct rte_eth_dev *dev) 327 { 328 /* 329 * Start receive and transmit vrings 330 * - Setup vring structure for all queues 331 * - Initialize descriptor for the rx vring 332 * - Allocate blank mbufs for the each rx descriptor 333 * 334 */ 335 uint16_t i; 336 uint16_t desc_idx; 337 338 PMD_INIT_FUNC_TRACE(); 339 340 /* Start rx vring. */ 341 for (i = 0; i < dev->data->nb_rx_queues; i++) { 342 struct virtnet_rx *rxvq = dev->data->rx_queues[i]; 343 struct virtqueue *vq = rxvq->vq; 344 int error, nbufs; 345 struct rte_mbuf *m; 346 347 virtio_dev_vring_start(vq); 348 if (rxvq->mpool == NULL) { 349 rte_exit(EXIT_FAILURE, 350 "Cannot allocate mbufs for rx virtqueue"); 351 } 352 353 /* Allocate blank mbufs for the each rx descriptor */ 354 nbufs = 0; 355 error = ENOSPC; 356 357 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 358 if (use_simple_rxtx) { 359 for (desc_idx = 0; desc_idx < vq->vq_nentries; 360 desc_idx++) { 361 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 362 vq->vq_ring.desc[desc_idx].flags = 363 VRING_DESC_F_WRITE; 364 } 365 } 366 #endif 367 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf)); 368 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; 369 desc_idx++) { 370 vq->sw_ring[vq->vq_nentries + desc_idx] = 371 &rxvq->fake_mbuf; 372 } 373 374 while (!virtqueue_full(vq)) { 375 m = rte_mbuf_raw_alloc(rxvq->mpool); 376 if (m == NULL) 377 break; 378 379 /****************************************** 380 * Enqueue allocated buffers * 381 *******************************************/ 382 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 383 if (use_simple_rxtx) 384 error = virtqueue_enqueue_recv_refill_simple(vq, m); 385 else 386 #endif 387 error = virtqueue_enqueue_recv_refill(vq, m); 388 if (error) { 389 rte_pktmbuf_free(m); 390 break; 391 } 392 nbufs++; 393 } 394 395 vq_update_avail_idx(vq); 396 397 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 398 399 VIRTQUEUE_DUMP(vq); 400 } 401 402 /* Start tx vring. */ 403 for (i = 0; i < dev->data->nb_tx_queues; i++) { 404 struct virtnet_tx *txvq = dev->data->tx_queues[i]; 405 struct virtqueue *vq = txvq->vq; 406 407 virtio_dev_vring_start(vq); 408 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 409 if (use_simple_rxtx) { 410 uint16_t mid_idx = vq->vq_nentries >> 1; 411 412 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) { 413 vq->vq_ring.avail->ring[desc_idx] = 414 desc_idx + mid_idx; 415 vq->vq_ring.desc[desc_idx + mid_idx].next = 416 desc_idx; 417 vq->vq_ring.desc[desc_idx + mid_idx].addr = 418 txvq->virtio_net_hdr_mem + 419 offsetof(struct virtio_tx_region, tx_hdr); 420 vq->vq_ring.desc[desc_idx + mid_idx].len = 421 vq->hw->vtnet_hdr_size; 422 vq->vq_ring.desc[desc_idx + mid_idx].flags = 423 VRING_DESC_F_NEXT; 424 vq->vq_ring.desc[desc_idx].flags = 0; 425 } 426 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries; 427 desc_idx++) 428 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 429 } 430 #endif 431 VIRTQUEUE_DUMP(vq); 432 } 433 } 434 435 int 436 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, 437 uint16_t queue_idx, 438 uint16_t nb_desc, 439 unsigned int socket_id, 440 __rte_unused const struct rte_eth_rxconf *rx_conf, 441 struct rte_mempool *mp) 442 { 443 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX; 444 struct virtnet_rx *rxvq; 445 int ret; 446 447 PMD_INIT_FUNC_TRACE(); 448 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx, 449 nb_desc, socket_id, (void **)&rxvq); 450 if (ret < 0) { 451 PMD_INIT_LOG(ERR, "rvq initialization failed"); 452 return ret; 453 } 454 455 /* Create mempool for rx mbuf allocation */ 456 rxvq->mpool = mp; 457 458 dev->data->rx_queues[queue_idx] = rxvq; 459 460 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 461 virtio_rxq_vec_setup(rxvq); 462 #endif 463 464 return 0; 465 } 466 467 void 468 virtio_dev_rx_queue_release(void *rxq) 469 { 470 struct virtnet_rx *rxvq = rxq; 471 struct virtqueue *vq; 472 const struct rte_memzone *mz; 473 474 if (rxvq == NULL) 475 return; 476 477 /* 478 * rxvq is freed when vq is freed, and as mz should be freed after the 479 * del_queue, so we reserve the mz pointer first. 480 */ 481 vq = rxvq->vq; 482 mz = rxvq->mz; 483 484 virtio_dev_queue_release(vq); 485 rte_memzone_free(mz); 486 } 487 488 /* 489 * struct rte_eth_dev *dev: Used to update dev 490 * uint16_t nb_desc: Defaults to values read from config space 491 * unsigned int socket_id: Used to allocate memzone 492 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 493 * uint16_t queue_idx: Just used as an index in dev txq list 494 */ 495 int 496 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 497 uint16_t queue_idx, 498 uint16_t nb_desc, 499 unsigned int socket_id, 500 const struct rte_eth_txconf *tx_conf) 501 { 502 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 503 504 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 505 struct virtio_hw *hw = dev->data->dev_private; 506 #endif 507 struct virtnet_tx *txvq; 508 struct virtqueue *vq; 509 uint16_t tx_free_thresh; 510 int ret; 511 512 PMD_INIT_FUNC_TRACE(); 513 514 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS) 515 != ETH_TXQ_FLAGS_NOXSUMS) { 516 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n"); 517 return -EINVAL; 518 } 519 520 #ifdef RTE_MACHINE_CPUFLAG_SSSE3 521 /* Use simple rx/tx func if single segment and no offloads */ 522 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS && 523 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { 524 PMD_INIT_LOG(INFO, "Using simple rx/tx path"); 525 dev->tx_pkt_burst = virtio_xmit_pkts_simple; 526 dev->rx_pkt_burst = virtio_recv_pkts_vec; 527 use_simple_rxtx = 1; 528 } 529 #endif 530 531 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx, 532 nb_desc, socket_id, (void **)&txvq); 533 if (ret < 0) { 534 PMD_INIT_LOG(ERR, "tvq initialization failed"); 535 return ret; 536 } 537 vq = txvq->vq; 538 539 tx_free_thresh = tx_conf->tx_free_thresh; 540 if (tx_free_thresh == 0) 541 tx_free_thresh = 542 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 543 544 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 545 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 546 "number of TX entries minus 3 (%u)." 547 " (tx_free_thresh=%u port=%u queue=%u)\n", 548 vq->vq_nentries - 3, 549 tx_free_thresh, dev->data->port_id, queue_idx); 550 return -EINVAL; 551 } 552 553 vq->vq_free_thresh = tx_free_thresh; 554 555 dev->data->tx_queues[queue_idx] = txvq; 556 return 0; 557 } 558 559 void 560 virtio_dev_tx_queue_release(void *txq) 561 { 562 struct virtnet_tx *txvq = txq; 563 struct virtqueue *vq; 564 const struct rte_memzone *mz; 565 const struct rte_memzone *hdr_mz; 566 567 if (txvq == NULL) 568 return; 569 570 /* 571 * txvq is freed when vq is freed, and as mz should be freed after the 572 * del_queue, so we reserve the mz pointer first. 573 */ 574 vq = txvq->vq; 575 mz = txvq->mz; 576 hdr_mz = txvq->virtio_net_hdr_mz; 577 578 virtio_dev_queue_release(vq); 579 rte_memzone_free(mz); 580 rte_memzone_free(hdr_mz); 581 } 582 583 static void 584 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 585 { 586 int error; 587 /* 588 * Requeue the discarded mbuf. This should always be 589 * successful since it was just dequeued. 590 */ 591 error = virtqueue_enqueue_recv_refill(vq, m); 592 if (unlikely(error)) { 593 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 594 rte_pktmbuf_free(m); 595 } 596 } 597 598 static void 599 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf) 600 { 601 uint32_t s = mbuf->pkt_len; 602 struct ether_addr *ea; 603 604 if (s == 64) { 605 stats->size_bins[1]++; 606 } else if (s > 64 && s < 1024) { 607 uint32_t bin; 608 609 /* count zeros, and offset into correct bin */ 610 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 611 stats->size_bins[bin]++; 612 } else { 613 if (s < 64) 614 stats->size_bins[0]++; 615 else if (s < 1519) 616 stats->size_bins[6]++; 617 else if (s >= 1519) 618 stats->size_bins[7]++; 619 } 620 621 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 622 if (is_multicast_ether_addr(ea)) { 623 if (is_broadcast_ether_addr(ea)) 624 stats->broadcast++; 625 else 626 stats->multicast++; 627 } 628 } 629 630 #define VIRTIO_MBUF_BURST_SZ 64 631 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 632 uint16_t 633 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 634 { 635 struct virtnet_rx *rxvq = rx_queue; 636 struct virtqueue *vq = rxvq->vq; 637 struct virtio_hw *hw; 638 struct rte_mbuf *rxm, *new_mbuf; 639 uint16_t nb_used, num, nb_rx; 640 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 641 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 642 int error; 643 uint32_t i, nb_enqueued; 644 uint32_t hdr_size; 645 646 nb_used = VIRTQUEUE_NUSED(vq); 647 648 virtio_rmb(); 649 650 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts); 651 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ); 652 if (likely(num > DESC_PER_CACHELINE)) 653 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 654 655 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num); 656 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 657 658 hw = vq->hw; 659 nb_rx = 0; 660 nb_enqueued = 0; 661 hdr_size = hw->vtnet_hdr_size; 662 663 for (i = 0; i < num ; i++) { 664 rxm = rcv_pkts[i]; 665 666 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 667 668 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 669 PMD_RX_LOG(ERR, "Packet drop"); 670 nb_enqueued++; 671 virtio_discard_rxbuf(vq, rxm); 672 rxvq->stats.errors++; 673 continue; 674 } 675 676 rxm->port = rxvq->port_id; 677 rxm->data_off = RTE_PKTMBUF_HEADROOM; 678 rxm->ol_flags = 0; 679 rxm->vlan_tci = 0; 680 681 rxm->nb_segs = 1; 682 rxm->next = NULL; 683 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 684 rxm->data_len = (uint16_t)(len[i] - hdr_size); 685 686 if (hw->vlan_strip) 687 rte_vlan_strip(rxm); 688 689 VIRTIO_DUMP_PACKET(rxm, rxm->data_len); 690 691 rx_pkts[nb_rx++] = rxm; 692 693 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len; 694 virtio_update_packet_stats(&rxvq->stats, rxm); 695 } 696 697 rxvq->stats.packets += nb_rx; 698 699 /* Allocate new mbuf for the used descriptor */ 700 error = ENOSPC; 701 while (likely(!virtqueue_full(vq))) { 702 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 703 if (unlikely(new_mbuf == NULL)) { 704 struct rte_eth_dev *dev 705 = &rte_eth_devices[rxvq->port_id]; 706 dev->data->rx_mbuf_alloc_failed++; 707 break; 708 } 709 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 710 if (unlikely(error)) { 711 rte_pktmbuf_free(new_mbuf); 712 break; 713 } 714 nb_enqueued++; 715 } 716 717 if (likely(nb_enqueued)) { 718 vq_update_avail_idx(vq); 719 720 if (unlikely(virtqueue_kick_prepare(vq))) { 721 virtqueue_notify(vq); 722 PMD_RX_LOG(DEBUG, "Notified"); 723 } 724 } 725 726 return nb_rx; 727 } 728 729 uint16_t 730 virtio_recv_mergeable_pkts(void *rx_queue, 731 struct rte_mbuf **rx_pkts, 732 uint16_t nb_pkts) 733 { 734 struct virtnet_rx *rxvq = rx_queue; 735 struct virtqueue *vq = rxvq->vq; 736 struct virtio_hw *hw; 737 struct rte_mbuf *rxm, *new_mbuf; 738 uint16_t nb_used, num, nb_rx; 739 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 740 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 741 struct rte_mbuf *prev; 742 int error; 743 uint32_t i, nb_enqueued; 744 uint32_t seg_num; 745 uint16_t extra_idx; 746 uint32_t seg_res; 747 uint32_t hdr_size; 748 749 nb_used = VIRTQUEUE_NUSED(vq); 750 751 virtio_rmb(); 752 753 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 754 755 hw = vq->hw; 756 nb_rx = 0; 757 i = 0; 758 nb_enqueued = 0; 759 seg_num = 0; 760 extra_idx = 0; 761 seg_res = 0; 762 hdr_size = hw->vtnet_hdr_size; 763 764 while (i < nb_used) { 765 struct virtio_net_hdr_mrg_rxbuf *header; 766 767 if (nb_rx == nb_pkts) 768 break; 769 770 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); 771 if (num != 1) 772 continue; 773 774 i++; 775 776 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 777 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]); 778 779 rxm = rcv_pkts[0]; 780 781 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 782 PMD_RX_LOG(ERR, "Packet drop"); 783 nb_enqueued++; 784 virtio_discard_rxbuf(vq, rxm); 785 rxvq->stats.errors++; 786 continue; 787 } 788 789 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 790 RTE_PKTMBUF_HEADROOM - hdr_size); 791 seg_num = header->num_buffers; 792 793 if (seg_num == 0) 794 seg_num = 1; 795 796 rxm->data_off = RTE_PKTMBUF_HEADROOM; 797 rxm->nb_segs = seg_num; 798 rxm->next = NULL; 799 rxm->ol_flags = 0; 800 rxm->vlan_tci = 0; 801 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 802 rxm->data_len = (uint16_t)(len[0] - hdr_size); 803 804 rxm->port = rxvq->port_id; 805 rx_pkts[nb_rx] = rxm; 806 prev = rxm; 807 808 seg_res = seg_num - 1; 809 810 while (seg_res != 0) { 811 /* 812 * Get extra segments for current uncompleted packet. 813 */ 814 uint16_t rcv_cnt = 815 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 816 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { 817 uint32_t rx_num = 818 virtqueue_dequeue_burst_rx(vq, 819 rcv_pkts, len, rcv_cnt); 820 i += rx_num; 821 rcv_cnt = rx_num; 822 } else { 823 PMD_RX_LOG(ERR, 824 "No enough segments for packet."); 825 nb_enqueued++; 826 virtio_discard_rxbuf(vq, rxm); 827 rxvq->stats.errors++; 828 break; 829 } 830 831 extra_idx = 0; 832 833 while (extra_idx < rcv_cnt) { 834 rxm = rcv_pkts[extra_idx]; 835 836 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 837 rxm->next = NULL; 838 rxm->pkt_len = (uint32_t)(len[extra_idx]); 839 rxm->data_len = (uint16_t)(len[extra_idx]); 840 841 if (prev) 842 prev->next = rxm; 843 844 prev = rxm; 845 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 846 extra_idx++; 847 }; 848 seg_res -= rcv_cnt; 849 } 850 851 if (hw->vlan_strip) 852 rte_vlan_strip(rx_pkts[nb_rx]); 853 854 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 855 rx_pkts[nb_rx]->data_len); 856 857 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len; 858 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]); 859 nb_rx++; 860 } 861 862 rxvq->stats.packets += nb_rx; 863 864 /* Allocate new mbuf for the used descriptor */ 865 error = ENOSPC; 866 while (likely(!virtqueue_full(vq))) { 867 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 868 if (unlikely(new_mbuf == NULL)) { 869 struct rte_eth_dev *dev 870 = &rte_eth_devices[rxvq->port_id]; 871 dev->data->rx_mbuf_alloc_failed++; 872 break; 873 } 874 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 875 if (unlikely(error)) { 876 rte_pktmbuf_free(new_mbuf); 877 break; 878 } 879 nb_enqueued++; 880 } 881 882 if (likely(nb_enqueued)) { 883 vq_update_avail_idx(vq); 884 885 if (unlikely(virtqueue_kick_prepare(vq))) { 886 virtqueue_notify(vq); 887 PMD_RX_LOG(DEBUG, "Notified"); 888 } 889 } 890 891 return nb_rx; 892 } 893 894 uint16_t 895 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 896 { 897 struct virtnet_tx *txvq = tx_queue; 898 struct virtqueue *vq = txvq->vq; 899 struct virtio_hw *hw = vq->hw; 900 uint16_t hdr_size = hw->vtnet_hdr_size; 901 uint16_t nb_used, nb_tx; 902 int error; 903 904 if (unlikely(nb_pkts < 1)) 905 return nb_pkts; 906 907 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 908 nb_used = VIRTQUEUE_NUSED(vq); 909 910 virtio_rmb(); 911 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) 912 virtio_xmit_cleanup(vq, nb_used); 913 914 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 915 struct rte_mbuf *txm = tx_pkts[nb_tx]; 916 int can_push = 0, use_indirect = 0, slots, need; 917 918 /* Do VLAN tag insertion */ 919 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 920 error = rte_vlan_insert(&txm); 921 if (unlikely(error)) { 922 rte_pktmbuf_free(txm); 923 continue; 924 } 925 } 926 927 /* optimize ring usage */ 928 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) && 929 rte_mbuf_refcnt_read(txm) == 1 && 930 RTE_MBUF_DIRECT(txm) && 931 txm->nb_segs == 1 && 932 rte_pktmbuf_headroom(txm) >= hdr_size && 933 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 934 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 935 can_push = 1; 936 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 937 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 938 use_indirect = 1; 939 940 /* How many main ring entries are needed to this Tx? 941 * any_layout => number of segments 942 * indirect => 1 943 * default => number of segments + 1 944 */ 945 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 946 need = slots - vq->vq_free_cnt; 947 948 /* Positive value indicates it need free vring descriptors */ 949 if (unlikely(need > 0)) { 950 nb_used = VIRTQUEUE_NUSED(vq); 951 virtio_rmb(); 952 need = RTE_MIN(need, (int)nb_used); 953 954 virtio_xmit_cleanup(vq, need); 955 need = slots - vq->vq_free_cnt; 956 if (unlikely(need > 0)) { 957 PMD_TX_LOG(ERR, 958 "No free tx descriptors to transmit"); 959 break; 960 } 961 } 962 963 /* Enqueue Packet buffers */ 964 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); 965 966 txvq->stats.bytes += txm->pkt_len; 967 virtio_update_packet_stats(&txvq->stats, txm); 968 } 969 970 txvq->stats.packets += nb_tx; 971 972 if (likely(nb_tx)) { 973 vq_update_avail_idx(vq); 974 975 if (unlikely(virtqueue_kick_prepare(vq))) { 976 virtqueue_notify(vq); 977 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 978 } 979 } 980 981 return nb_tx; 982 } 983