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 57 #include "virtio_logs.h" 58 #include "virtio_ethdev.h" 59 #include "virtio_pci.h" 60 #include "virtqueue.h" 61 #include "virtio_rxtx.h" 62 63 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP 64 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len) 65 #else 66 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0) 67 #endif 68 69 70 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \ 71 ETH_TXQ_FLAGS_NOOFFLOADS) 72 73 static void 74 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) 75 { 76 struct vring_desc *dp, *dp_tail; 77 struct vq_desc_extra *dxp; 78 uint16_t desc_idx_last = desc_idx; 79 80 dp = &vq->vq_ring.desc[desc_idx]; 81 dxp = &vq->vq_descx[desc_idx]; 82 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs); 83 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) { 84 while (dp->flags & VRING_DESC_F_NEXT) { 85 desc_idx_last = dp->next; 86 dp = &vq->vq_ring.desc[dp->next]; 87 } 88 } 89 dxp->ndescs = 0; 90 91 /* 92 * We must append the existing free chain, if any, to the end of 93 * newly freed chain. If the virtqueue was completely used, then 94 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above). 95 */ 96 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) { 97 vq->vq_desc_head_idx = desc_idx; 98 } else { 99 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx]; 100 dp_tail->next = desc_idx; 101 } 102 103 vq->vq_desc_tail_idx = desc_idx_last; 104 dp->next = VQ_RING_DESC_CHAIN_END; 105 } 106 107 static uint16_t 108 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, 109 uint32_t *len, uint16_t num) 110 { 111 struct vring_used_elem *uep; 112 struct rte_mbuf *cookie; 113 uint16_t used_idx, desc_idx; 114 uint16_t i; 115 116 /* Caller does the check */ 117 for (i = 0; i < num ; i++) { 118 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 119 uep = &vq->vq_ring.used->ring[used_idx]; 120 desc_idx = (uint16_t) uep->id; 121 len[i] = uep->len; 122 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie; 123 124 if (unlikely(cookie == NULL)) { 125 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n", 126 vq->vq_used_cons_idx); 127 break; 128 } 129 130 rte_prefetch0(cookie); 131 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *)); 132 rx_pkts[i] = cookie; 133 vq->vq_used_cons_idx++; 134 vq_ring_free_chain(vq, desc_idx); 135 vq->vq_descx[desc_idx].cookie = NULL; 136 } 137 138 return i; 139 } 140 141 #ifndef DEFAULT_TX_FREE_THRESH 142 #define DEFAULT_TX_FREE_THRESH 32 143 #endif 144 145 /* Cleanup from completed transmits. */ 146 static void 147 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) 148 { 149 uint16_t i, used_idx, desc_idx; 150 for (i = 0; i < num; i++) { 151 struct vring_used_elem *uep; 152 struct vq_desc_extra *dxp; 153 154 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 155 uep = &vq->vq_ring.used->ring[used_idx]; 156 157 desc_idx = (uint16_t) uep->id; 158 dxp = &vq->vq_descx[desc_idx]; 159 vq->vq_used_cons_idx++; 160 vq_ring_free_chain(vq, desc_idx); 161 162 if (dxp->cookie != NULL) { 163 rte_pktmbuf_free(dxp->cookie); 164 dxp->cookie = NULL; 165 } 166 } 167 } 168 169 170 static inline int 171 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie) 172 { 173 struct vq_desc_extra *dxp; 174 struct virtio_hw *hw = vq->hw; 175 struct vring_desc *start_dp; 176 uint16_t needed = 1; 177 uint16_t head_idx, idx; 178 179 if (unlikely(vq->vq_free_cnt == 0)) 180 return -ENOSPC; 181 if (unlikely(vq->vq_free_cnt < needed)) 182 return -EMSGSIZE; 183 184 head_idx = vq->vq_desc_head_idx; 185 if (unlikely(head_idx >= vq->vq_nentries)) 186 return -EFAULT; 187 188 idx = head_idx; 189 dxp = &vq->vq_descx[idx]; 190 dxp->cookie = (void *)cookie; 191 dxp->ndescs = needed; 192 193 start_dp = vq->vq_ring.desc; 194 start_dp[idx].addr = 195 VIRTIO_MBUF_ADDR(cookie, vq) + 196 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size; 197 start_dp[idx].len = 198 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size; 199 start_dp[idx].flags = VRING_DESC_F_WRITE; 200 idx = start_dp[idx].next; 201 vq->vq_desc_head_idx = idx; 202 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 203 vq->vq_desc_tail_idx = idx; 204 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 205 vq_update_avail_ring(vq, head_idx); 206 207 return 0; 208 } 209 210 static inline void 211 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, 212 uint16_t needed, int use_indirect, int can_push) 213 { 214 struct vq_desc_extra *dxp; 215 struct virtqueue *vq = txvq->vq; 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 = vq->hw->vtnet_hdr_size; 220 unsigned long offs; 221 222 head_idx = vq->vq_desc_head_idx; 223 idx = head_idx; 224 dxp = &vq->vq_descx[idx]; 225 dxp->cookie = (void *)cookie; 226 dxp->ndescs = needed; 227 228 start_dp = vq->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 = vq->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 = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); 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 = vq->vq_ring.desc[head_idx].next; 276 277 vq->vq_desc_head_idx = idx; 278 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) 279 vq->vq_desc_tail_idx = idx; 280 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); 281 vq_update_avail_ring(vq, head_idx); 282 } 283 284 static void 285 virtio_dev_vring_start(struct virtqueue *vq) 286 { 287 int size = vq->vq_nentries; 288 struct vring *vr = &vq->vq_ring; 289 uint8_t *ring_mem = vq->vq_ring_virt_mem; 290 291 PMD_INIT_FUNC_TRACE(); 292 293 /* 294 * Reinitialise since virtio port might have been stopped and restarted 295 */ 296 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size); 297 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); 298 vq->vq_used_cons_idx = 0; 299 vq->vq_desc_head_idx = 0; 300 vq->vq_avail_idx = 0; 301 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1); 302 vq->vq_free_cnt = vq->vq_nentries; 303 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); 304 305 vring_desc_init(vr->desc, size); 306 307 /* 308 * Disable device(host) interrupting guest 309 */ 310 virtqueue_disable_intr(vq); 311 } 312 313 void 314 virtio_dev_cq_start(struct rte_eth_dev *dev) 315 { 316 struct virtio_hw *hw = dev->data->dev_private; 317 318 if (hw->cvq && hw->cvq->vq) { 319 virtio_dev_vring_start(hw->cvq->vq); 320 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq); 321 } 322 } 323 324 void 325 virtio_dev_rxtx_start(struct rte_eth_dev *dev) 326 { 327 /* 328 * Start receive and transmit vrings 329 * - Setup vring structure for all queues 330 * - Initialize descriptor for the rx vring 331 * - Allocate blank mbufs for the each rx descriptor 332 * 333 */ 334 uint16_t i; 335 uint16_t desc_idx; 336 struct virtio_hw *hw = dev->data->dev_private; 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 if (hw->use_simple_rxtx) { 358 for (desc_idx = 0; desc_idx < vq->vq_nentries; 359 desc_idx++) { 360 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 361 vq->vq_ring.desc[desc_idx].flags = 362 VRING_DESC_F_WRITE; 363 } 364 } 365 366 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf)); 367 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; 368 desc_idx++) { 369 vq->sw_ring[vq->vq_nentries + desc_idx] = 370 &rxvq->fake_mbuf; 371 } 372 373 while (!virtqueue_full(vq)) { 374 m = rte_mbuf_raw_alloc(rxvq->mpool); 375 if (m == NULL) 376 break; 377 378 /****************************************** 379 * Enqueue allocated buffers * 380 *******************************************/ 381 if (hw->use_simple_rxtx) 382 error = virtqueue_enqueue_recv_refill_simple(vq, m); 383 else 384 error = virtqueue_enqueue_recv_refill(vq, m); 385 386 if (error) { 387 rte_pktmbuf_free(m); 388 break; 389 } 390 nbufs++; 391 } 392 393 vq_update_avail_idx(vq); 394 395 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs); 396 397 VIRTQUEUE_DUMP(vq); 398 } 399 400 /* Start tx vring. */ 401 for (i = 0; i < dev->data->nb_tx_queues; i++) { 402 struct virtnet_tx *txvq = dev->data->tx_queues[i]; 403 struct virtqueue *vq = txvq->vq; 404 405 virtio_dev_vring_start(vq); 406 if (hw->use_simple_rxtx) { 407 uint16_t mid_idx = vq->vq_nentries >> 1; 408 409 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) { 410 vq->vq_ring.avail->ring[desc_idx] = 411 desc_idx + mid_idx; 412 vq->vq_ring.desc[desc_idx + mid_idx].next = 413 desc_idx; 414 vq->vq_ring.desc[desc_idx + mid_idx].addr = 415 txvq->virtio_net_hdr_mem + 416 offsetof(struct virtio_tx_region, tx_hdr); 417 vq->vq_ring.desc[desc_idx + mid_idx].len = 418 vq->hw->vtnet_hdr_size; 419 vq->vq_ring.desc[desc_idx + mid_idx].flags = 420 VRING_DESC_F_NEXT; 421 vq->vq_ring.desc[desc_idx].flags = 0; 422 } 423 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries; 424 desc_idx++) 425 vq->vq_ring.avail->ring[desc_idx] = desc_idx; 426 } 427 428 VIRTQUEUE_DUMP(vq); 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 virtnet_rx *rxvq; 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, (void **)&rxvq); 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 rxvq->mpool = mp; 454 455 dev->data->rx_queues[queue_idx] = rxvq; 456 457 virtio_rxq_vec_setup(rxvq); 458 459 return 0; 460 } 461 462 void 463 virtio_dev_rx_queue_release(void *rxq) 464 { 465 struct virtnet_rx *rxvq = rxq; 466 struct virtqueue *vq; 467 const struct rte_memzone *mz; 468 469 if (rxvq == NULL) 470 return; 471 472 /* 473 * rxvq is freed when vq is freed, and as mz should be freed after the 474 * del_queue, so we reserve the mz pointer first. 475 */ 476 vq = rxvq->vq; 477 mz = rxvq->mz; 478 479 virtio_dev_queue_release(vq); 480 rte_memzone_free(mz); 481 } 482 483 static void 484 virtio_update_rxtx_handler(struct rte_eth_dev *dev, 485 const struct rte_eth_txconf *tx_conf) 486 { 487 uint8_t use_simple_rxtx = 0; 488 struct virtio_hw *hw = dev->data->dev_private; 489 490 #if defined RTE_ARCH_X86 491 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3)) 492 use_simple_rxtx = 1; 493 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM 494 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON)) 495 use_simple_rxtx = 1; 496 #endif 497 /* Use simple rx/tx func if single segment and no offloads */ 498 if (use_simple_rxtx && 499 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS && 500 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) { 501 PMD_INIT_LOG(INFO, "Using simple rx/tx path"); 502 dev->tx_pkt_burst = virtio_xmit_pkts_simple; 503 dev->rx_pkt_burst = virtio_recv_pkts_vec; 504 hw->use_simple_rxtx = use_simple_rxtx; 505 } 506 } 507 508 /* 509 * struct rte_eth_dev *dev: Used to update dev 510 * uint16_t nb_desc: Defaults to values read from config space 511 * unsigned int socket_id: Used to allocate memzone 512 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine 513 * uint16_t queue_idx: Just used as an index in dev txq list 514 */ 515 int 516 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, 517 uint16_t queue_idx, 518 uint16_t nb_desc, 519 unsigned int socket_id, 520 const struct rte_eth_txconf *tx_conf) 521 { 522 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX; 523 struct virtnet_tx *txvq; 524 struct virtqueue *vq; 525 uint16_t tx_free_thresh; 526 int ret; 527 528 PMD_INIT_FUNC_TRACE(); 529 530 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS) 531 != ETH_TXQ_FLAGS_NOXSUMS) { 532 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n"); 533 return -EINVAL; 534 } 535 536 virtio_update_rxtx_handler(dev, tx_conf); 537 538 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx, 539 nb_desc, socket_id, (void **)&txvq); 540 if (ret < 0) { 541 PMD_INIT_LOG(ERR, "tvq initialization failed"); 542 return ret; 543 } 544 vq = txvq->vq; 545 546 tx_free_thresh = tx_conf->tx_free_thresh; 547 if (tx_free_thresh == 0) 548 tx_free_thresh = 549 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH); 550 551 if (tx_free_thresh >= (vq->vq_nentries - 3)) { 552 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the " 553 "number of TX entries minus 3 (%u)." 554 " (tx_free_thresh=%u port=%u queue=%u)\n", 555 vq->vq_nentries - 3, 556 tx_free_thresh, dev->data->port_id, queue_idx); 557 return -EINVAL; 558 } 559 560 vq->vq_free_thresh = tx_free_thresh; 561 562 dev->data->tx_queues[queue_idx] = txvq; 563 return 0; 564 } 565 566 void 567 virtio_dev_tx_queue_release(void *txq) 568 { 569 struct virtnet_tx *txvq = txq; 570 struct virtqueue *vq; 571 const struct rte_memzone *mz; 572 const struct rte_memzone *hdr_mz; 573 574 if (txvq == NULL) 575 return; 576 577 /* 578 * txvq is freed when vq is freed, and as mz should be freed after the 579 * del_queue, so we reserve the mz pointer first. 580 */ 581 vq = txvq->vq; 582 mz = txvq->mz; 583 hdr_mz = txvq->virtio_net_hdr_mz; 584 585 virtio_dev_queue_release(vq); 586 rte_memzone_free(mz); 587 rte_memzone_free(hdr_mz); 588 } 589 590 static void 591 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m) 592 { 593 int error; 594 /* 595 * Requeue the discarded mbuf. This should always be 596 * successful since it was just dequeued. 597 */ 598 error = virtqueue_enqueue_recv_refill(vq, m); 599 if (unlikely(error)) { 600 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf"); 601 rte_pktmbuf_free(m); 602 } 603 } 604 605 static void 606 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf) 607 { 608 uint32_t s = mbuf->pkt_len; 609 struct ether_addr *ea; 610 611 if (s == 64) { 612 stats->size_bins[1]++; 613 } else if (s > 64 && s < 1024) { 614 uint32_t bin; 615 616 /* count zeros, and offset into correct bin */ 617 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5; 618 stats->size_bins[bin]++; 619 } else { 620 if (s < 64) 621 stats->size_bins[0]++; 622 else if (s < 1519) 623 stats->size_bins[6]++; 624 else if (s >= 1519) 625 stats->size_bins[7]++; 626 } 627 628 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *); 629 if (is_multicast_ether_addr(ea)) { 630 if (is_broadcast_ether_addr(ea)) 631 stats->broadcast++; 632 else 633 stats->multicast++; 634 } 635 } 636 637 /* Optionally fill offload information in structure */ 638 static int 639 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr) 640 { 641 struct rte_net_hdr_lens hdr_lens; 642 uint32_t hdrlen, ptype; 643 int l4_supported = 0; 644 645 /* nothing to do */ 646 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE) 647 return 0; 648 649 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN; 650 651 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK); 652 m->packet_type = ptype; 653 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP || 654 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP || 655 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP) 656 l4_supported = 1; 657 658 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 659 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len; 660 if (hdr->csum_start <= hdrlen && l4_supported) { 661 m->ol_flags |= PKT_RX_L4_CKSUM_NONE; 662 } else { 663 /* Unknown proto or tunnel, do sw cksum. We can assume 664 * the cksum field is in the first segment since the 665 * buffers we provided to the host are large enough. 666 * In case of SCTP, this will be wrong since it's a CRC 667 * but there's nothing we can do. 668 */ 669 uint16_t csum, off; 670 671 rte_raw_cksum_mbuf(m, hdr->csum_start, 672 rte_pktmbuf_pkt_len(m) - hdr->csum_start, 673 &csum); 674 if (likely(csum != 0xffff)) 675 csum = ~csum; 676 off = hdr->csum_offset + hdr->csum_start; 677 if (rte_pktmbuf_data_len(m) >= off + 1) 678 *rte_pktmbuf_mtod_offset(m, uint16_t *, 679 off) = csum; 680 } 681 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) { 682 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD; 683 } 684 685 return 0; 686 } 687 688 static inline int 689 rx_offload_enabled(struct virtio_hw *hw) 690 { 691 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM); 692 } 693 694 #define VIRTIO_MBUF_BURST_SZ 64 695 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc)) 696 uint16_t 697 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) 698 { 699 struct virtnet_rx *rxvq = rx_queue; 700 struct virtqueue *vq = rxvq->vq; 701 struct virtio_hw *hw; 702 struct rte_mbuf *rxm, *new_mbuf; 703 uint16_t nb_used, num, nb_rx; 704 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 705 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 706 int error; 707 uint32_t i, nb_enqueued; 708 uint32_t hdr_size; 709 int offload; 710 struct virtio_net_hdr *hdr; 711 712 nb_used = VIRTQUEUE_NUSED(vq); 713 714 virtio_rmb(); 715 716 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts); 717 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ); 718 if (likely(num > DESC_PER_CACHELINE)) 719 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); 720 721 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num); 722 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); 723 724 hw = vq->hw; 725 nb_rx = 0; 726 nb_enqueued = 0; 727 hdr_size = hw->vtnet_hdr_size; 728 offload = rx_offload_enabled(hw); 729 730 for (i = 0; i < num ; i++) { 731 rxm = rcv_pkts[i]; 732 733 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]); 734 735 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) { 736 PMD_RX_LOG(ERR, "Packet drop"); 737 nb_enqueued++; 738 virtio_discard_rxbuf(vq, rxm); 739 rxvq->stats.errors++; 740 continue; 741 } 742 743 rxm->port = rxvq->port_id; 744 rxm->data_off = RTE_PKTMBUF_HEADROOM; 745 rxm->ol_flags = 0; 746 rxm->vlan_tci = 0; 747 748 rxm->nb_segs = 1; 749 rxm->next = NULL; 750 rxm->pkt_len = (uint32_t)(len[i] - hdr_size); 751 rxm->data_len = (uint16_t)(len[i] - hdr_size); 752 753 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr + 754 RTE_PKTMBUF_HEADROOM - hdr_size); 755 756 if (hw->vlan_strip) 757 rte_vlan_strip(rxm); 758 759 if (offload && virtio_rx_offload(rxm, hdr) < 0) { 760 virtio_discard_rxbuf(vq, rxm); 761 rxvq->stats.errors++; 762 continue; 763 } 764 765 VIRTIO_DUMP_PACKET(rxm, rxm->data_len); 766 767 rx_pkts[nb_rx++] = rxm; 768 769 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len; 770 virtio_update_packet_stats(&rxvq->stats, rxm); 771 } 772 773 rxvq->stats.packets += nb_rx; 774 775 /* Allocate new mbuf for the used descriptor */ 776 error = ENOSPC; 777 while (likely(!virtqueue_full(vq))) { 778 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 779 if (unlikely(new_mbuf == NULL)) { 780 struct rte_eth_dev *dev 781 = &rte_eth_devices[rxvq->port_id]; 782 dev->data->rx_mbuf_alloc_failed++; 783 break; 784 } 785 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 786 if (unlikely(error)) { 787 rte_pktmbuf_free(new_mbuf); 788 break; 789 } 790 nb_enqueued++; 791 } 792 793 if (likely(nb_enqueued)) { 794 vq_update_avail_idx(vq); 795 796 if (unlikely(virtqueue_kick_prepare(vq))) { 797 virtqueue_notify(vq); 798 PMD_RX_LOG(DEBUG, "Notified"); 799 } 800 } 801 802 return nb_rx; 803 } 804 805 uint16_t 806 virtio_recv_mergeable_pkts(void *rx_queue, 807 struct rte_mbuf **rx_pkts, 808 uint16_t nb_pkts) 809 { 810 struct virtnet_rx *rxvq = rx_queue; 811 struct virtqueue *vq = rxvq->vq; 812 struct virtio_hw *hw; 813 struct rte_mbuf *rxm, *new_mbuf; 814 uint16_t nb_used, num, nb_rx; 815 uint32_t len[VIRTIO_MBUF_BURST_SZ]; 816 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; 817 struct rte_mbuf *prev; 818 int error; 819 uint32_t i, nb_enqueued; 820 uint32_t seg_num; 821 uint16_t extra_idx; 822 uint32_t seg_res; 823 uint32_t hdr_size; 824 int offload; 825 826 nb_used = VIRTQUEUE_NUSED(vq); 827 828 virtio_rmb(); 829 830 PMD_RX_LOG(DEBUG, "used:%d", nb_used); 831 832 hw = vq->hw; 833 nb_rx = 0; 834 i = 0; 835 nb_enqueued = 0; 836 seg_num = 0; 837 extra_idx = 0; 838 seg_res = 0; 839 hdr_size = hw->vtnet_hdr_size; 840 offload = rx_offload_enabled(hw); 841 842 while (i < nb_used) { 843 struct virtio_net_hdr_mrg_rxbuf *header; 844 845 if (nb_rx == nb_pkts) 846 break; 847 848 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1); 849 if (num != 1) 850 continue; 851 852 i++; 853 854 PMD_RX_LOG(DEBUG, "dequeue:%d", num); 855 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]); 856 857 rxm = rcv_pkts[0]; 858 859 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) { 860 PMD_RX_LOG(ERR, "Packet drop"); 861 nb_enqueued++; 862 virtio_discard_rxbuf(vq, rxm); 863 rxvq->stats.errors++; 864 continue; 865 } 866 867 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr + 868 RTE_PKTMBUF_HEADROOM - hdr_size); 869 seg_num = header->num_buffers; 870 871 if (seg_num == 0) 872 seg_num = 1; 873 874 rxm->data_off = RTE_PKTMBUF_HEADROOM; 875 rxm->nb_segs = seg_num; 876 rxm->next = NULL; 877 rxm->ol_flags = 0; 878 rxm->vlan_tci = 0; 879 rxm->pkt_len = (uint32_t)(len[0] - hdr_size); 880 rxm->data_len = (uint16_t)(len[0] - hdr_size); 881 882 rxm->port = rxvq->port_id; 883 rx_pkts[nb_rx] = rxm; 884 prev = rxm; 885 886 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) { 887 virtio_discard_rxbuf(vq, rxm); 888 rxvq->stats.errors++; 889 continue; 890 } 891 892 seg_res = seg_num - 1; 893 894 while (seg_res != 0) { 895 /* 896 * Get extra segments for current uncompleted packet. 897 */ 898 uint16_t rcv_cnt = 899 RTE_MIN(seg_res, RTE_DIM(rcv_pkts)); 900 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { 901 uint32_t rx_num = 902 virtqueue_dequeue_burst_rx(vq, 903 rcv_pkts, len, rcv_cnt); 904 i += rx_num; 905 rcv_cnt = rx_num; 906 } else { 907 PMD_RX_LOG(ERR, 908 "No enough segments for packet."); 909 nb_enqueued++; 910 virtio_discard_rxbuf(vq, rxm); 911 rxvq->stats.errors++; 912 break; 913 } 914 915 extra_idx = 0; 916 917 while (extra_idx < rcv_cnt) { 918 rxm = rcv_pkts[extra_idx]; 919 920 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size; 921 rxm->next = NULL; 922 rxm->pkt_len = (uint32_t)(len[extra_idx]); 923 rxm->data_len = (uint16_t)(len[extra_idx]); 924 925 if (prev) 926 prev->next = rxm; 927 928 prev = rxm; 929 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len; 930 extra_idx++; 931 }; 932 seg_res -= rcv_cnt; 933 } 934 935 if (hw->vlan_strip) 936 rte_vlan_strip(rx_pkts[nb_rx]); 937 938 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx], 939 rx_pkts[nb_rx]->data_len); 940 941 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len; 942 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]); 943 nb_rx++; 944 } 945 946 rxvq->stats.packets += nb_rx; 947 948 /* Allocate new mbuf for the used descriptor */ 949 error = ENOSPC; 950 while (likely(!virtqueue_full(vq))) { 951 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool); 952 if (unlikely(new_mbuf == NULL)) { 953 struct rte_eth_dev *dev 954 = &rte_eth_devices[rxvq->port_id]; 955 dev->data->rx_mbuf_alloc_failed++; 956 break; 957 } 958 error = virtqueue_enqueue_recv_refill(vq, new_mbuf); 959 if (unlikely(error)) { 960 rte_pktmbuf_free(new_mbuf); 961 break; 962 } 963 nb_enqueued++; 964 } 965 966 if (likely(nb_enqueued)) { 967 vq_update_avail_idx(vq); 968 969 if (unlikely(virtqueue_kick_prepare(vq))) { 970 virtqueue_notify(vq); 971 PMD_RX_LOG(DEBUG, "Notified"); 972 } 973 } 974 975 return nb_rx; 976 } 977 978 uint16_t 979 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) 980 { 981 struct virtnet_tx *txvq = tx_queue; 982 struct virtqueue *vq = txvq->vq; 983 struct virtio_hw *hw = vq->hw; 984 uint16_t hdr_size = hw->vtnet_hdr_size; 985 uint16_t nb_used, nb_tx; 986 int error; 987 988 if (unlikely(nb_pkts < 1)) 989 return nb_pkts; 990 991 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); 992 nb_used = VIRTQUEUE_NUSED(vq); 993 994 virtio_rmb(); 995 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh)) 996 virtio_xmit_cleanup(vq, nb_used); 997 998 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { 999 struct rte_mbuf *txm = tx_pkts[nb_tx]; 1000 int can_push = 0, use_indirect = 0, slots, need; 1001 1002 /* Do VLAN tag insertion */ 1003 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { 1004 error = rte_vlan_insert(&txm); 1005 if (unlikely(error)) { 1006 rte_pktmbuf_free(txm); 1007 continue; 1008 } 1009 } 1010 1011 /* optimize ring usage */ 1012 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) && 1013 rte_mbuf_refcnt_read(txm) == 1 && 1014 RTE_MBUF_DIRECT(txm) && 1015 txm->nb_segs == 1 && 1016 rte_pktmbuf_headroom(txm) >= hdr_size && 1017 rte_is_aligned(rte_pktmbuf_mtod(txm, char *), 1018 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) 1019 can_push = 1; 1020 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) && 1021 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT) 1022 use_indirect = 1; 1023 1024 /* How many main ring entries are needed to this Tx? 1025 * any_layout => number of segments 1026 * indirect => 1 1027 * default => number of segments + 1 1028 */ 1029 slots = use_indirect ? 1 : (txm->nb_segs + !can_push); 1030 need = slots - vq->vq_free_cnt; 1031 1032 /* Positive value indicates it need free vring descriptors */ 1033 if (unlikely(need > 0)) { 1034 nb_used = VIRTQUEUE_NUSED(vq); 1035 virtio_rmb(); 1036 need = RTE_MIN(need, (int)nb_used); 1037 1038 virtio_xmit_cleanup(vq, need); 1039 need = slots - vq->vq_free_cnt; 1040 if (unlikely(need > 0)) { 1041 PMD_TX_LOG(ERR, 1042 "No free tx descriptors to transmit"); 1043 break; 1044 } 1045 } 1046 1047 /* Enqueue Packet buffers */ 1048 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push); 1049 1050 txvq->stats.bytes += txm->pkt_len; 1051 virtio_update_packet_stats(&txvq->stats, txm); 1052 } 1053 1054 txvq->stats.packets += nb_tx; 1055 1056 if (likely(nb_tx)) { 1057 vq_update_avail_idx(vq); 1058 1059 if (unlikely(virtqueue_kick_prepare(vq))) { 1060 virtqueue_notify(vq); 1061 PMD_TX_LOG(DEBUG, "Notified backend after xmit"); 1062 } 1063 } 1064 1065 return nb_tx; 1066 } 1067