1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2016 Intel Corporation 3 */ 4 5 #include <stdint.h> 6 #include <stdio.h> 7 #include <fcntl.h> 8 #include <string.h> 9 #include <errno.h> 10 #include <sys/mman.h> 11 #include <unistd.h> 12 #include <sys/eventfd.h> 13 #include <sys/types.h> 14 #include <sys/stat.h> 15 16 #include <rte_eal_memconfig.h> 17 18 #include "vhost.h" 19 #include "virtio_user_dev.h" 20 #include "../virtio_ethdev.h" 21 22 #define VIRTIO_USER_MEM_EVENT_CLB_NAME "virtio_user_mem_event_clb" 23 24 static int 25 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel) 26 { 27 /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come 28 * firstly because vhost depends on this msg to allocate virtqueue 29 * pair. 30 */ 31 struct vhost_vring_file file; 32 33 file.index = queue_sel; 34 file.fd = dev->callfds[queue_sel]; 35 dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file); 36 37 return 0; 38 } 39 40 static int 41 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel) 42 { 43 struct vhost_vring_file file; 44 struct vhost_vring_state state; 45 struct vring *vring = &dev->vrings[queue_sel]; 46 struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel]; 47 struct vhost_vring_addr addr = { 48 .index = queue_sel, 49 .log_guest_addr = 0, 50 .flags = 0, /* disable log */ 51 }; 52 53 if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) { 54 addr.desc_user_addr = 55 (uint64_t)(uintptr_t)pq_vring->desc; 56 addr.avail_user_addr = 57 (uint64_t)(uintptr_t)pq_vring->driver; 58 addr.used_user_addr = 59 (uint64_t)(uintptr_t)pq_vring->device; 60 } else { 61 addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc; 62 addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail; 63 addr.used_user_addr = (uint64_t)(uintptr_t)vring->used; 64 } 65 66 state.index = queue_sel; 67 state.num = vring->num; 68 dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state); 69 70 state.index = queue_sel; 71 state.num = 0; /* no reservation */ 72 if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) 73 state.num |= (1 << 15); 74 dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state); 75 76 dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr); 77 78 /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes 79 * lastly because vhost depends on this msg to judge if 80 * virtio is ready. 81 */ 82 file.index = queue_sel; 83 file.fd = dev->kickfds[queue_sel]; 84 dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file); 85 86 return 0; 87 } 88 89 static int 90 virtio_user_queue_setup(struct virtio_user_dev *dev, 91 int (*fn)(struct virtio_user_dev *, uint32_t)) 92 { 93 uint32_t i, queue_sel; 94 95 for (i = 0; i < dev->max_queue_pairs; ++i) { 96 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX; 97 if (fn(dev, queue_sel) < 0) { 98 PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i); 99 return -1; 100 } 101 } 102 for (i = 0; i < dev->max_queue_pairs; ++i) { 103 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX; 104 if (fn(dev, queue_sel) < 0) { 105 PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i); 106 return -1; 107 } 108 } 109 110 return 0; 111 } 112 113 int 114 is_vhost_user_by_type(const char *path) 115 { 116 struct stat sb; 117 118 if (stat(path, &sb) == -1) 119 return 0; 120 121 return S_ISSOCK(sb.st_mode); 122 } 123 124 int 125 virtio_user_start_device(struct virtio_user_dev *dev) 126 { 127 struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config; 128 uint64_t features; 129 int ret; 130 131 /* 132 * XXX workaround! 133 * 134 * We need to make sure that the locks will be 135 * taken in the correct order to avoid deadlocks. 136 * 137 * Before releasing this lock, this thread should 138 * not trigger any memory hotplug events. 139 * 140 * This is a temporary workaround, and should be 141 * replaced when we get proper supports from the 142 * memory subsystem in the future. 143 */ 144 rte_rwlock_read_lock(&mcfg->memory_hotplug_lock); 145 pthread_mutex_lock(&dev->mutex); 146 147 if (is_vhost_user_by_type(dev->path) && dev->vhostfd < 0) 148 goto error; 149 150 /* Step 0: tell vhost to create queues */ 151 if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0) 152 goto error; 153 154 /* Step 1: set features */ 155 features = dev->features; 156 /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */ 157 features &= ~(1ull << VIRTIO_NET_F_MAC); 158 /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */ 159 features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ); 160 features &= ~(1ull << VIRTIO_NET_F_STATUS); 161 ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features); 162 if (ret < 0) 163 goto error; 164 PMD_DRV_LOG(INFO, "set features: %" PRIx64, features); 165 166 /* Step 2: share memory regions */ 167 ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL); 168 if (ret < 0) 169 goto error; 170 171 /* Step 3: kick queues */ 172 if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0) 173 goto error; 174 175 /* Step 4: enable queues 176 * we enable the 1st queue pair by default. 177 */ 178 dev->ops->enable_qp(dev, 0, 1); 179 180 dev->started = true; 181 pthread_mutex_unlock(&dev->mutex); 182 rte_rwlock_read_unlock(&mcfg->memory_hotplug_lock); 183 184 return 0; 185 error: 186 pthread_mutex_unlock(&dev->mutex); 187 rte_rwlock_read_unlock(&mcfg->memory_hotplug_lock); 188 /* TODO: free resource here or caller to check */ 189 return -1; 190 } 191 192 int virtio_user_stop_device(struct virtio_user_dev *dev) 193 { 194 struct vhost_vring_state state; 195 uint32_t i; 196 int error = 0; 197 198 pthread_mutex_lock(&dev->mutex); 199 if (!dev->started) 200 goto out; 201 202 for (i = 0; i < dev->max_queue_pairs; ++i) 203 dev->ops->enable_qp(dev, i, 0); 204 205 /* Stop the backend. */ 206 for (i = 0; i < dev->max_queue_pairs * 2; ++i) { 207 state.index = i; 208 if (dev->ops->send_request(dev, VHOST_USER_GET_VRING_BASE, 209 &state) < 0) { 210 PMD_DRV_LOG(ERR, "get_vring_base failed, index=%u\n", 211 i); 212 error = -1; 213 goto out; 214 } 215 } 216 217 dev->started = false; 218 out: 219 pthread_mutex_unlock(&dev->mutex); 220 221 return error; 222 } 223 224 static inline void 225 parse_mac(struct virtio_user_dev *dev, const char *mac) 226 { 227 int i, r; 228 uint32_t tmp[ETHER_ADDR_LEN]; 229 230 if (!mac) 231 return; 232 233 r = sscanf(mac, "%x:%x:%x:%x:%x:%x", &tmp[0], 234 &tmp[1], &tmp[2], &tmp[3], &tmp[4], &tmp[5]); 235 if (r == ETHER_ADDR_LEN) { 236 for (i = 0; i < ETHER_ADDR_LEN; ++i) 237 dev->mac_addr[i] = (uint8_t)tmp[i]; 238 dev->mac_specified = 1; 239 } else { 240 /* ignore the wrong mac, use random mac */ 241 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac); 242 } 243 } 244 245 static int 246 virtio_user_dev_init_notify(struct virtio_user_dev *dev) 247 { 248 uint32_t i, j; 249 int callfd; 250 int kickfd; 251 252 for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) { 253 if (i >= dev->max_queue_pairs * 2) { 254 dev->kickfds[i] = -1; 255 dev->callfds[i] = -1; 256 continue; 257 } 258 259 /* May use invalid flag, but some backend uses kickfd and 260 * callfd as criteria to judge if dev is alive. so finally we 261 * use real event_fd. 262 */ 263 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK); 264 if (callfd < 0) { 265 PMD_DRV_LOG(ERR, "callfd error, %s", strerror(errno)); 266 break; 267 } 268 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK); 269 if (kickfd < 0) { 270 PMD_DRV_LOG(ERR, "kickfd error, %s", strerror(errno)); 271 break; 272 } 273 dev->callfds[i] = callfd; 274 dev->kickfds[i] = kickfd; 275 } 276 277 if (i < VIRTIO_MAX_VIRTQUEUES) { 278 for (j = 0; j <= i; ++j) { 279 close(dev->callfds[j]); 280 close(dev->kickfds[j]); 281 } 282 283 return -1; 284 } 285 286 return 0; 287 } 288 289 static int 290 virtio_user_fill_intr_handle(struct virtio_user_dev *dev) 291 { 292 uint32_t i; 293 struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id]; 294 295 if (!eth_dev->intr_handle) { 296 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle)); 297 if (!eth_dev->intr_handle) { 298 PMD_DRV_LOG(ERR, "fail to allocate intr_handle"); 299 return -1; 300 } 301 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle)); 302 } 303 304 for (i = 0; i < dev->max_queue_pairs; ++i) 305 eth_dev->intr_handle->efds[i] = dev->callfds[i]; 306 eth_dev->intr_handle->nb_efd = dev->max_queue_pairs; 307 eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1; 308 eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV; 309 /* For virtio vdev, no need to read counter for clean */ 310 eth_dev->intr_handle->efd_counter_size = 0; 311 eth_dev->intr_handle->fd = -1; 312 if (dev->vhostfd >= 0) 313 eth_dev->intr_handle->fd = dev->vhostfd; 314 else if (dev->is_server) 315 eth_dev->intr_handle->fd = dev->listenfd; 316 317 return 0; 318 } 319 320 static void 321 virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused, 322 const void *addr __rte_unused, 323 size_t len __rte_unused, 324 void *arg) 325 { 326 struct virtio_user_dev *dev = arg; 327 struct rte_memseg_list *msl; 328 uint16_t i; 329 330 /* ignore externally allocated memory */ 331 msl = rte_mem_virt2memseg_list(addr); 332 if (msl->external) 333 return; 334 335 pthread_mutex_lock(&dev->mutex); 336 337 if (dev->started == false) 338 goto exit; 339 340 /* Step 1: pause the active queues */ 341 for (i = 0; i < dev->queue_pairs; i++) 342 dev->ops->enable_qp(dev, i, 0); 343 344 /* Step 2: update memory regions */ 345 dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL); 346 347 /* Step 3: resume the active queues */ 348 for (i = 0; i < dev->queue_pairs; i++) 349 dev->ops->enable_qp(dev, i, 1); 350 351 exit: 352 pthread_mutex_unlock(&dev->mutex); 353 } 354 355 static int 356 virtio_user_dev_setup(struct virtio_user_dev *dev) 357 { 358 uint32_t q; 359 360 dev->vhostfd = -1; 361 dev->vhostfds = NULL; 362 dev->tapfds = NULL; 363 364 if (dev->is_server) { 365 if (access(dev->path, F_OK) == 0 && 366 !is_vhost_user_by_type(dev->path)) { 367 PMD_DRV_LOG(ERR, "Server mode doesn't support vhost-kernel!"); 368 return -1; 369 } 370 dev->ops = &virtio_ops_user; 371 } else { 372 if (is_vhost_user_by_type(dev->path)) { 373 dev->ops = &virtio_ops_user; 374 } else { 375 dev->ops = &virtio_ops_kernel; 376 377 dev->vhostfds = malloc(dev->max_queue_pairs * 378 sizeof(int)); 379 dev->tapfds = malloc(dev->max_queue_pairs * 380 sizeof(int)); 381 if (!dev->vhostfds || !dev->tapfds) { 382 PMD_INIT_LOG(ERR, "Failed to malloc"); 383 return -1; 384 } 385 386 for (q = 0; q < dev->max_queue_pairs; ++q) { 387 dev->vhostfds[q] = -1; 388 dev->tapfds[q] = -1; 389 } 390 } 391 } 392 393 if (dev->ops->setup(dev) < 0) 394 return -1; 395 396 if (virtio_user_dev_init_notify(dev) < 0) 397 return -1; 398 399 if (virtio_user_fill_intr_handle(dev) < 0) 400 return -1; 401 402 return 0; 403 } 404 405 /* Use below macro to filter features from vhost backend */ 406 #define VIRTIO_USER_SUPPORTED_FEATURES \ 407 (1ULL << VIRTIO_NET_F_MAC | \ 408 1ULL << VIRTIO_NET_F_STATUS | \ 409 1ULL << VIRTIO_NET_F_MQ | \ 410 1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR | \ 411 1ULL << VIRTIO_NET_F_CTRL_VQ | \ 412 1ULL << VIRTIO_NET_F_CTRL_RX | \ 413 1ULL << VIRTIO_NET_F_CTRL_VLAN | \ 414 1ULL << VIRTIO_NET_F_CSUM | \ 415 1ULL << VIRTIO_NET_F_HOST_TSO4 | \ 416 1ULL << VIRTIO_NET_F_HOST_TSO6 | \ 417 1ULL << VIRTIO_NET_F_MRG_RXBUF | \ 418 1ULL << VIRTIO_RING_F_INDIRECT_DESC | \ 419 1ULL << VIRTIO_NET_F_GUEST_CSUM | \ 420 1ULL << VIRTIO_NET_F_GUEST_TSO4 | \ 421 1ULL << VIRTIO_NET_F_GUEST_TSO6 | \ 422 1ULL << VIRTIO_F_IN_ORDER | \ 423 1ULL << VIRTIO_F_VERSION_1 | \ 424 1ULL << VIRTIO_F_RING_PACKED) 425 426 int 427 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues, 428 int cq, int queue_size, const char *mac, char **ifname, 429 int server, int mrg_rxbuf, int in_order, int packed_vq) 430 { 431 pthread_mutex_init(&dev->mutex, NULL); 432 snprintf(dev->path, PATH_MAX, "%s", path); 433 dev->started = 0; 434 dev->max_queue_pairs = queues; 435 dev->queue_pairs = 1; /* mq disabled by default */ 436 dev->queue_size = queue_size; 437 dev->is_server = server; 438 dev->mac_specified = 0; 439 dev->frontend_features = 0; 440 dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES; 441 parse_mac(dev, mac); 442 443 if (*ifname) { 444 dev->ifname = *ifname; 445 *ifname = NULL; 446 } 447 448 if (virtio_user_dev_setup(dev) < 0) { 449 PMD_INIT_LOG(ERR, "backend set up fails"); 450 return -1; 451 } 452 453 if (!dev->is_server) { 454 if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER, 455 NULL) < 0) { 456 PMD_INIT_LOG(ERR, "set_owner fails: %s", 457 strerror(errno)); 458 return -1; 459 } 460 461 if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES, 462 &dev->device_features) < 0) { 463 PMD_INIT_LOG(ERR, "get_features failed: %s", 464 strerror(errno)); 465 return -1; 466 } 467 } else { 468 /* We just pretend vhost-user can support all these features. 469 * Note that this could be problematic that if some feature is 470 * negotiated but not supported by the vhost-user which comes 471 * later. 472 */ 473 dev->device_features = VIRTIO_USER_SUPPORTED_FEATURES; 474 } 475 476 if (!mrg_rxbuf) 477 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF); 478 479 if (!in_order) 480 dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER); 481 482 if (!packed_vq) 483 dev->unsupported_features |= (1ull << VIRTIO_F_RING_PACKED); 484 485 if (dev->mac_specified) 486 dev->frontend_features |= (1ull << VIRTIO_NET_F_MAC); 487 else 488 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC); 489 490 if (cq) { 491 /* device does not really need to know anything about CQ, 492 * so if necessary, we just claim to support CQ 493 */ 494 dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ); 495 } else { 496 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ); 497 /* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */ 498 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX); 499 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN); 500 dev->unsupported_features |= 501 (1ull << VIRTIO_NET_F_GUEST_ANNOUNCE); 502 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ); 503 dev->unsupported_features |= 504 (1ull << VIRTIO_NET_F_CTRL_MAC_ADDR); 505 } 506 507 /* The backend will not report this feature, we add it explicitly */ 508 if (is_vhost_user_by_type(dev->path)) 509 dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS); 510 511 /* 512 * Device features = 513 * (frontend_features | backend_features) & ~unsupported_features; 514 */ 515 dev->device_features |= dev->frontend_features; 516 dev->device_features &= ~dev->unsupported_features; 517 518 if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME, 519 virtio_user_mem_event_cb, dev)) { 520 if (rte_errno != ENOTSUP) { 521 PMD_INIT_LOG(ERR, "Failed to register mem event" 522 " callback\n"); 523 return -1; 524 } 525 } 526 527 return 0; 528 } 529 530 void 531 virtio_user_dev_uninit(struct virtio_user_dev *dev) 532 { 533 uint32_t i; 534 535 virtio_user_stop_device(dev); 536 537 rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev); 538 539 for (i = 0; i < dev->max_queue_pairs * 2; ++i) { 540 close(dev->callfds[i]); 541 close(dev->kickfds[i]); 542 } 543 544 close(dev->vhostfd); 545 546 if (dev->is_server && dev->listenfd >= 0) { 547 close(dev->listenfd); 548 dev->listenfd = -1; 549 } 550 551 if (dev->vhostfds) { 552 for (i = 0; i < dev->max_queue_pairs; ++i) 553 close(dev->vhostfds[i]); 554 free(dev->vhostfds); 555 free(dev->tapfds); 556 } 557 558 free(dev->ifname); 559 560 if (dev->is_server) 561 unlink(dev->path); 562 } 563 564 uint8_t 565 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs) 566 { 567 uint16_t i; 568 uint8_t ret = 0; 569 570 if (q_pairs > dev->max_queue_pairs) { 571 PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported", 572 q_pairs, dev->max_queue_pairs); 573 return -1; 574 } 575 576 /* Server mode can't enable queue pairs if vhostfd is invalid, 577 * always return 0 in this case. 578 */ 579 if (!dev->is_server || dev->vhostfd >= 0) { 580 for (i = 0; i < q_pairs; ++i) 581 ret |= dev->ops->enable_qp(dev, i, 1); 582 for (i = q_pairs; i < dev->max_queue_pairs; ++i) 583 ret |= dev->ops->enable_qp(dev, i, 0); 584 } 585 dev->queue_pairs = q_pairs; 586 587 return ret; 588 } 589 590 static uint32_t 591 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring, 592 uint16_t idx_hdr) 593 { 594 struct virtio_net_ctrl_hdr *hdr; 595 virtio_net_ctrl_ack status = ~0; 596 uint16_t i, idx_data, idx_status; 597 uint32_t n_descs = 0; 598 599 /* locate desc for header, data, and status */ 600 idx_data = vring->desc[idx_hdr].next; 601 n_descs++; 602 603 i = idx_data; 604 while (vring->desc[i].flags == VRING_DESC_F_NEXT) { 605 i = vring->desc[i].next; 606 n_descs++; 607 } 608 609 /* locate desc for status */ 610 idx_status = i; 611 n_descs++; 612 613 hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr; 614 if (hdr->class == VIRTIO_NET_CTRL_MQ && 615 hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 616 uint16_t queues; 617 618 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr; 619 status = virtio_user_handle_mq(dev, queues); 620 } 621 622 /* Update status */ 623 *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status; 624 625 return n_descs; 626 } 627 628 static inline int 629 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter) 630 { 631 uint16_t flags = desc->flags; 632 633 return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) && 634 wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED); 635 } 636 637 static uint32_t 638 virtio_user_handle_ctrl_msg_packed(struct virtio_user_dev *dev, 639 struct vring_packed *vring, 640 uint16_t idx_hdr) 641 { 642 struct virtio_net_ctrl_hdr *hdr; 643 virtio_net_ctrl_ack status = ~0; 644 uint16_t idx_data, idx_status; 645 /* initialize to one, header is first */ 646 uint32_t n_descs = 1; 647 648 /* locate desc for header, data, and status */ 649 idx_data = idx_hdr + 1; 650 if (idx_data >= dev->queue_size) 651 idx_data -= dev->queue_size; 652 653 n_descs++; 654 655 idx_status = idx_data; 656 while (vring->desc[idx_status].flags & VRING_DESC_F_NEXT) { 657 idx_status++; 658 if (idx_status >= dev->queue_size) 659 idx_status -= dev->queue_size; 660 n_descs++; 661 } 662 663 hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr; 664 if (hdr->class == VIRTIO_NET_CTRL_MQ && 665 hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 666 uint16_t queues; 667 668 queues = *(uint16_t *)(uintptr_t) 669 vring->desc[idx_data].addr; 670 status = virtio_user_handle_mq(dev, queues); 671 } 672 673 /* Update status */ 674 *(virtio_net_ctrl_ack *)(uintptr_t) 675 vring->desc[idx_status].addr = status; 676 677 /* Update used descriptor */ 678 vring->desc[idx_hdr].id = vring->desc[idx_status].id; 679 vring->desc[idx_hdr].len = sizeof(status); 680 681 return n_descs; 682 } 683 684 void 685 virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx) 686 { 687 struct virtio_user_queue *vq = &dev->packed_queues[queue_idx]; 688 struct vring_packed *vring = &dev->packed_vrings[queue_idx]; 689 uint16_t n_descs, flags; 690 691 while (desc_is_avail(&vring->desc[vq->used_idx], 692 vq->used_wrap_counter)) { 693 694 n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring, 695 vq->used_idx); 696 697 flags = VRING_DESC_F_WRITE; 698 if (vq->used_wrap_counter) 699 flags |= VRING_PACKED_DESC_F_AVAIL_USED; 700 701 rte_smp_wmb(); 702 vring->desc[vq->used_idx].flags = flags; 703 704 vq->used_idx += n_descs; 705 if (vq->used_idx >= dev->queue_size) { 706 vq->used_idx -= dev->queue_size; 707 vq->used_wrap_counter ^= 1; 708 } 709 } 710 } 711 712 void 713 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx) 714 { 715 uint16_t avail_idx, desc_idx; 716 struct vring_used_elem *uep; 717 uint32_t n_descs; 718 struct vring *vring = &dev->vrings[queue_idx]; 719 720 /* Consume avail ring, using used ring idx as first one */ 721 while (vring->used->idx != vring->avail->idx) { 722 avail_idx = (vring->used->idx) & (vring->num - 1); 723 desc_idx = vring->avail->ring[avail_idx]; 724 725 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx); 726 727 /* Update used ring */ 728 uep = &vring->used->ring[avail_idx]; 729 uep->id = desc_idx; 730 uep->len = n_descs; 731 732 vring->used->idx++; 733 } 734 } 735