1 /* 2 * vhost-vdpa.c 3 * 4 * Copyright(c) 2017-2018 Intel Corporation. 5 * Copyright(c) 2020 Red Hat, Inc. 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or later. 8 * See the COPYING file in the top-level directory. 9 * 10 */ 11 12 #include "qemu/osdep.h" 13 #include "clients.h" 14 #include "hw/virtio/virtio-net.h" 15 #include "net/vhost_net.h" 16 #include "net/vhost-vdpa.h" 17 #include "hw/virtio/vhost-vdpa.h" 18 #include "qemu/config-file.h" 19 #include "qemu/error-report.h" 20 #include "qemu/log.h" 21 #include "qemu/memalign.h" 22 #include "qemu/option.h" 23 #include "qapi/error.h" 24 #include <linux/vhost.h> 25 #include <sys/ioctl.h> 26 #include <err.h> 27 #include "standard-headers/linux/virtio_net.h" 28 #include "monitor/monitor.h" 29 #include "migration/migration.h" 30 #include "migration/misc.h" 31 #include "hw/virtio/vhost.h" 32 33 /* Todo:need to add the multiqueue support here */ 34 typedef struct VhostVDPAState { 35 NetClientState nc; 36 struct vhost_vdpa vhost_vdpa; 37 Notifier migration_state; 38 VHostNetState *vhost_net; 39 40 /* Control commands shadow buffers */ 41 void *cvq_cmd_out_buffer; 42 virtio_net_ctrl_ack *status; 43 44 /* The device always have SVQ enabled */ 45 bool always_svq; 46 47 /* The device can isolate CVQ in its own ASID */ 48 bool cvq_isolated; 49 50 bool started; 51 } VhostVDPAState; 52 53 const int vdpa_feature_bits[] = { 54 VIRTIO_F_NOTIFY_ON_EMPTY, 55 VIRTIO_RING_F_INDIRECT_DESC, 56 VIRTIO_RING_F_EVENT_IDX, 57 VIRTIO_F_ANY_LAYOUT, 58 VIRTIO_F_VERSION_1, 59 VIRTIO_NET_F_CSUM, 60 VIRTIO_NET_F_GUEST_CSUM, 61 VIRTIO_NET_F_GSO, 62 VIRTIO_NET_F_GUEST_TSO4, 63 VIRTIO_NET_F_GUEST_TSO6, 64 VIRTIO_NET_F_GUEST_ECN, 65 VIRTIO_NET_F_GUEST_UFO, 66 VIRTIO_NET_F_HOST_TSO4, 67 VIRTIO_NET_F_HOST_TSO6, 68 VIRTIO_NET_F_HOST_ECN, 69 VIRTIO_NET_F_HOST_UFO, 70 VIRTIO_NET_F_MRG_RXBUF, 71 VIRTIO_NET_F_MTU, 72 VIRTIO_NET_F_CTRL_RX, 73 VIRTIO_NET_F_CTRL_RX_EXTRA, 74 VIRTIO_NET_F_CTRL_VLAN, 75 VIRTIO_NET_F_CTRL_MAC_ADDR, 76 VIRTIO_NET_F_RSS, 77 VIRTIO_NET_F_MQ, 78 VIRTIO_NET_F_CTRL_VQ, 79 VIRTIO_F_IOMMU_PLATFORM, 80 VIRTIO_F_RING_PACKED, 81 VIRTIO_F_RING_RESET, 82 VIRTIO_NET_F_RSS, 83 VIRTIO_NET_F_HASH_REPORT, 84 VIRTIO_NET_F_STATUS, 85 VHOST_INVALID_FEATURE_BIT 86 }; 87 88 /** Supported device specific feature bits with SVQ */ 89 static const uint64_t vdpa_svq_device_features = 90 BIT_ULL(VIRTIO_NET_F_CSUM) | 91 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | 92 BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) | 93 BIT_ULL(VIRTIO_NET_F_MTU) | 94 BIT_ULL(VIRTIO_NET_F_MAC) | 95 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | 96 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | 97 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | 98 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | 99 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | 100 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | 101 BIT_ULL(VIRTIO_NET_F_HOST_ECN) | 102 BIT_ULL(VIRTIO_NET_F_HOST_UFO) | 103 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | 104 BIT_ULL(VIRTIO_NET_F_STATUS) | 105 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | 106 BIT_ULL(VIRTIO_NET_F_MQ) | 107 BIT_ULL(VIRTIO_F_ANY_LAYOUT) | 108 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | 109 /* VHOST_F_LOG_ALL is exposed by SVQ */ 110 BIT_ULL(VHOST_F_LOG_ALL) | 111 BIT_ULL(VIRTIO_NET_F_RSC_EXT) | 112 BIT_ULL(VIRTIO_NET_F_STANDBY) | 113 BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX); 114 115 #define VHOST_VDPA_NET_CVQ_ASID 1 116 117 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 118 { 119 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 120 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 121 return s->vhost_net; 122 } 123 124 static size_t vhost_vdpa_net_cvq_cmd_len(void) 125 { 126 /* 127 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 128 * In buffer is always 1 byte, so it should fit here 129 */ 130 return sizeof(struct virtio_net_ctrl_hdr) + 131 2 * sizeof(struct virtio_net_ctrl_mac) + 132 MAC_TABLE_ENTRIES * ETH_ALEN; 133 } 134 135 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 136 { 137 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 138 } 139 140 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) 141 { 142 uint64_t invalid_dev_features = 143 features & ~vdpa_svq_device_features & 144 /* Transport are all accepted at this point */ 145 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 146 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 147 148 if (invalid_dev_features) { 149 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 150 invalid_dev_features); 151 return false; 152 } 153 154 return vhost_svq_valid_features(features, errp); 155 } 156 157 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 158 { 159 uint32_t device_id; 160 int ret; 161 struct vhost_dev *hdev; 162 163 hdev = (struct vhost_dev *)&net->dev; 164 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 165 if (device_id != VIRTIO_ID_NET) { 166 return -ENOTSUP; 167 } 168 return ret; 169 } 170 171 static int vhost_vdpa_add(NetClientState *ncs, void *be, 172 int queue_pair_index, int nvqs) 173 { 174 VhostNetOptions options; 175 struct vhost_net *net = NULL; 176 VhostVDPAState *s; 177 int ret; 178 179 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 180 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 181 s = DO_UPCAST(VhostVDPAState, nc, ncs); 182 options.net_backend = ncs; 183 options.opaque = be; 184 options.busyloop_timeout = 0; 185 options.nvqs = nvqs; 186 187 net = vhost_net_init(&options); 188 if (!net) { 189 error_report("failed to init vhost_net for queue"); 190 goto err_init; 191 } 192 s->vhost_net = net; 193 ret = vhost_vdpa_net_check_device_id(net); 194 if (ret) { 195 goto err_check; 196 } 197 return 0; 198 err_check: 199 vhost_net_cleanup(net); 200 g_free(net); 201 err_init: 202 return -1; 203 } 204 205 static void vhost_vdpa_cleanup(NetClientState *nc) 206 { 207 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 208 209 munmap(s->cvq_cmd_out_buffer, vhost_vdpa_net_cvq_cmd_page_len()); 210 munmap(s->status, vhost_vdpa_net_cvq_cmd_page_len()); 211 if (s->vhost_net) { 212 vhost_net_cleanup(s->vhost_net); 213 g_free(s->vhost_net); 214 s->vhost_net = NULL; 215 } 216 if (s->vhost_vdpa.device_fd >= 0) { 217 qemu_close(s->vhost_vdpa.device_fd); 218 s->vhost_vdpa.device_fd = -1; 219 } 220 } 221 222 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 223 { 224 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 225 226 return true; 227 } 228 229 static bool vhost_vdpa_has_ufo(NetClientState *nc) 230 { 231 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 232 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 233 uint64_t features = 0; 234 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 235 features = vhost_net_get_features(s->vhost_net, features); 236 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 237 238 } 239 240 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 241 Error **errp) 242 { 243 const char *driver = object_class_get_name(oc); 244 245 if (!g_str_has_prefix(driver, "virtio-net-")) { 246 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 247 return false; 248 } 249 250 return true; 251 } 252 253 /** Dummy receive in case qemu falls back to userland tap networking */ 254 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 255 size_t size) 256 { 257 return size; 258 } 259 260 /** From any vdpa net client, get the netclient of the first queue pair */ 261 static VhostVDPAState *vhost_vdpa_net_first_nc_vdpa(VhostVDPAState *s) 262 { 263 NICState *nic = qemu_get_nic(s->nc.peer); 264 NetClientState *nc0 = qemu_get_peer(nic->ncs, 0); 265 266 return DO_UPCAST(VhostVDPAState, nc, nc0); 267 } 268 269 static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable) 270 { 271 struct vhost_vdpa *v = &s->vhost_vdpa; 272 VirtIONet *n; 273 VirtIODevice *vdev; 274 int data_queue_pairs, cvq, r; 275 276 /* We are only called on the first data vqs and only if x-svq is not set */ 277 if (s->vhost_vdpa.shadow_vqs_enabled == enable) { 278 return; 279 } 280 281 vdev = v->dev->vdev; 282 n = VIRTIO_NET(vdev); 283 if (!n->vhost_started) { 284 return; 285 } 286 287 data_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 288 cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? 289 n->max_ncs - n->max_queue_pairs : 0; 290 /* 291 * TODO: vhost_net_stop does suspend, get_base and reset. We can be smarter 292 * in the future and resume the device if read-only operations between 293 * suspend and reset goes wrong. 294 */ 295 vhost_net_stop(vdev, n->nic->ncs, data_queue_pairs, cvq); 296 297 /* Start will check migration setup_or_active to configure or not SVQ */ 298 r = vhost_net_start(vdev, n->nic->ncs, data_queue_pairs, cvq); 299 if (unlikely(r < 0)) { 300 error_report("unable to start vhost net: %s(%d)", g_strerror(-r), -r); 301 } 302 } 303 304 static void vdpa_net_migration_state_notifier(Notifier *notifier, void *data) 305 { 306 MigrationState *migration = data; 307 VhostVDPAState *s = container_of(notifier, VhostVDPAState, 308 migration_state); 309 310 if (migration_in_setup(migration)) { 311 vhost_vdpa_net_log_global_enable(s, true); 312 } else if (migration_has_failed(migration)) { 313 vhost_vdpa_net_log_global_enable(s, false); 314 } 315 } 316 317 static void vhost_vdpa_net_data_start_first(VhostVDPAState *s) 318 { 319 struct vhost_vdpa *v = &s->vhost_vdpa; 320 321 add_migration_state_change_notifier(&s->migration_state); 322 if (v->shadow_vqs_enabled) { 323 v->iova_tree = vhost_iova_tree_new(v->iova_range.first, 324 v->iova_range.last); 325 } 326 } 327 328 static int vhost_vdpa_net_data_start(NetClientState *nc) 329 { 330 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 331 struct vhost_vdpa *v = &s->vhost_vdpa; 332 333 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 334 335 if (s->always_svq || 336 migration_is_setup_or_active(migrate_get_current()->state)) { 337 v->shadow_vqs_enabled = true; 338 v->shadow_data = true; 339 } else { 340 v->shadow_vqs_enabled = false; 341 v->shadow_data = false; 342 } 343 344 if (v->index == 0) { 345 vhost_vdpa_net_data_start_first(s); 346 return 0; 347 } 348 349 if (v->shadow_vqs_enabled) { 350 VhostVDPAState *s0 = vhost_vdpa_net_first_nc_vdpa(s); 351 v->iova_tree = s0->vhost_vdpa.iova_tree; 352 } 353 354 return 0; 355 } 356 357 static void vhost_vdpa_net_client_stop(NetClientState *nc) 358 { 359 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 360 struct vhost_dev *dev; 361 362 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 363 364 if (s->vhost_vdpa.index == 0) { 365 remove_migration_state_change_notifier(&s->migration_state); 366 } 367 368 dev = s->vhost_vdpa.dev; 369 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 370 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 371 } 372 } 373 374 static NetClientInfo net_vhost_vdpa_info = { 375 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 376 .size = sizeof(VhostVDPAState), 377 .receive = vhost_vdpa_receive, 378 .start = vhost_vdpa_net_data_start, 379 .stop = vhost_vdpa_net_client_stop, 380 .cleanup = vhost_vdpa_cleanup, 381 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 382 .has_ufo = vhost_vdpa_has_ufo, 383 .check_peer_type = vhost_vdpa_check_peer_type, 384 }; 385 386 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index, 387 Error **errp) 388 { 389 struct vhost_vring_state state = { 390 .index = vq_index, 391 }; 392 int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state); 393 394 if (unlikely(r < 0)) { 395 r = -errno; 396 error_setg_errno(errp, errno, "Cannot get VQ %u group", vq_index); 397 return r; 398 } 399 400 return state.num; 401 } 402 403 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, 404 unsigned vq_group, 405 unsigned asid_num) 406 { 407 struct vhost_vring_state asid = { 408 .index = vq_group, 409 .num = asid_num, 410 }; 411 int r; 412 413 r = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); 414 if (unlikely(r < 0)) { 415 error_report("Can't set vq group %u asid %u, errno=%d (%s)", 416 asid.index, asid.num, errno, g_strerror(errno)); 417 } 418 return r; 419 } 420 421 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 422 { 423 VhostIOVATree *tree = v->iova_tree; 424 DMAMap needle = { 425 /* 426 * No need to specify size or to look for more translations since 427 * this contiguous chunk was allocated by us. 428 */ 429 .translated_addr = (hwaddr)(uintptr_t)addr, 430 }; 431 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 432 int r; 433 434 if (unlikely(!map)) { 435 error_report("Cannot locate expected map"); 436 return; 437 } 438 439 r = vhost_vdpa_dma_unmap(v, v->address_space_id, map->iova, map->size + 1); 440 if (unlikely(r != 0)) { 441 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 442 } 443 444 vhost_iova_tree_remove(tree, *map); 445 } 446 447 /** Map CVQ buffer. */ 448 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 449 bool write) 450 { 451 DMAMap map = {}; 452 int r; 453 454 map.translated_addr = (hwaddr)(uintptr_t)buf; 455 map.size = size - 1; 456 map.perm = write ? IOMMU_RW : IOMMU_RO, 457 r = vhost_iova_tree_map_alloc(v->iova_tree, &map); 458 if (unlikely(r != IOVA_OK)) { 459 error_report("Cannot map injected element"); 460 return r; 461 } 462 463 r = vhost_vdpa_dma_map(v, v->address_space_id, map.iova, 464 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); 465 if (unlikely(r < 0)) { 466 goto dma_map_err; 467 } 468 469 return 0; 470 471 dma_map_err: 472 vhost_iova_tree_remove(v->iova_tree, map); 473 return r; 474 } 475 476 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 477 { 478 VhostVDPAState *s, *s0; 479 struct vhost_vdpa *v; 480 int64_t cvq_group; 481 int r; 482 Error *err = NULL; 483 484 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 485 486 s = DO_UPCAST(VhostVDPAState, nc, nc); 487 v = &s->vhost_vdpa; 488 489 s0 = vhost_vdpa_net_first_nc_vdpa(s); 490 v->shadow_data = s0->vhost_vdpa.shadow_vqs_enabled; 491 v->shadow_vqs_enabled = s->always_svq; 492 s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID; 493 494 if (s->vhost_vdpa.shadow_data) { 495 /* SVQ is already configured for all virtqueues */ 496 goto out; 497 } 498 499 /* 500 * If we early return in these cases SVQ will not be enabled. The migration 501 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG. 502 */ 503 if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) { 504 return 0; 505 } 506 507 if (!s->cvq_isolated) { 508 return 0; 509 } 510 511 cvq_group = vhost_vdpa_get_vring_group(v->device_fd, 512 v->dev->vq_index_end - 1, 513 &err); 514 if (unlikely(cvq_group < 0)) { 515 error_report_err(err); 516 return cvq_group; 517 } 518 519 r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID); 520 if (unlikely(r < 0)) { 521 return r; 522 } 523 524 v->shadow_vqs_enabled = true; 525 s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; 526 527 out: 528 if (!s->vhost_vdpa.shadow_vqs_enabled) { 529 return 0; 530 } 531 532 if (s0->vhost_vdpa.iova_tree) { 533 /* 534 * SVQ is already configured for all virtqueues. Reuse IOVA tree for 535 * simplicity, whether CVQ shares ASID with guest or not, because: 536 * - Memory listener need access to guest's memory addresses allocated 537 * in the IOVA tree. 538 * - There should be plenty of IOVA address space for both ASID not to 539 * worry about collisions between them. Guest's translations are 540 * still validated with virtio virtqueue_pop so there is no risk for 541 * the guest to access memory that it shouldn't. 542 * 543 * To allocate a iova tree per ASID is doable but it complicates the 544 * code and it is not worth it for the moment. 545 */ 546 v->iova_tree = s0->vhost_vdpa.iova_tree; 547 } else { 548 v->iova_tree = vhost_iova_tree_new(v->iova_range.first, 549 v->iova_range.last); 550 } 551 552 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 553 vhost_vdpa_net_cvq_cmd_page_len(), false); 554 if (unlikely(r < 0)) { 555 return r; 556 } 557 558 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, 559 vhost_vdpa_net_cvq_cmd_page_len(), true); 560 if (unlikely(r < 0)) { 561 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 562 } 563 564 return r; 565 } 566 567 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 568 { 569 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 570 571 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 572 573 if (s->vhost_vdpa.shadow_vqs_enabled) { 574 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 575 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); 576 } 577 578 vhost_vdpa_net_client_stop(nc); 579 } 580 581 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, 582 size_t in_len) 583 { 584 /* Buffers for the device */ 585 const struct iovec out = { 586 .iov_base = s->cvq_cmd_out_buffer, 587 .iov_len = out_len, 588 }; 589 const struct iovec in = { 590 .iov_base = s->status, 591 .iov_len = sizeof(virtio_net_ctrl_ack), 592 }; 593 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 594 int r; 595 596 r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); 597 if (unlikely(r != 0)) { 598 if (unlikely(r == -ENOSPC)) { 599 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 600 __func__); 601 } 602 return r; 603 } 604 605 /* 606 * We can poll here since we've had BQL from the time we sent the 607 * descriptor. Also, we need to take the answer before SVQ pulls by itself, 608 * when BQL is released 609 */ 610 return vhost_svq_poll(svq); 611 } 612 613 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, 614 uint8_t cmd, const void *data, 615 size_t data_size) 616 { 617 const struct virtio_net_ctrl_hdr ctrl = { 618 .class = class, 619 .cmd = cmd, 620 }; 621 622 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); 623 624 memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); 625 memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); 626 627 return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, 628 sizeof(virtio_net_ctrl_ack)); 629 } 630 631 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) 632 { 633 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 634 ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC, 635 VIRTIO_NET_CTRL_MAC_ADDR_SET, 636 n->mac, sizeof(n->mac)); 637 if (unlikely(dev_written < 0)) { 638 return dev_written; 639 } 640 641 return *s->status != VIRTIO_NET_OK; 642 } 643 644 return 0; 645 } 646 647 static int vhost_vdpa_net_load_mq(VhostVDPAState *s, 648 const VirtIONet *n) 649 { 650 struct virtio_net_ctrl_mq mq; 651 ssize_t dev_written; 652 653 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_MQ)) { 654 return 0; 655 } 656 657 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); 658 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ, 659 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq, 660 sizeof(mq)); 661 if (unlikely(dev_written < 0)) { 662 return dev_written; 663 } 664 665 return *s->status != VIRTIO_NET_OK; 666 } 667 668 static int vhost_vdpa_net_load_offloads(VhostVDPAState *s, 669 const VirtIONet *n) 670 { 671 uint64_t offloads; 672 ssize_t dev_written; 673 674 if (!virtio_vdev_has_feature(&n->parent_obj, 675 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 676 return 0; 677 } 678 679 if (n->curr_guest_offloads == virtio_net_supported_guest_offloads(n)) { 680 /* 681 * According to VirtIO standard, "Upon feature negotiation 682 * corresponding offload gets enabled to preserve 683 * backward compatibility.". 684 * 685 * Therefore, there is no need to send this CVQ command if the 686 * driver also enables all supported offloads, which aligns with 687 * the device's defaults. 688 * 689 * Note that the device's defaults can mismatch the driver's 690 * configuration only at live migration. 691 */ 692 return 0; 693 } 694 695 offloads = cpu_to_le64(n->curr_guest_offloads); 696 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 697 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, 698 &offloads, sizeof(offloads)); 699 if (unlikely(dev_written < 0)) { 700 return dev_written; 701 } 702 703 return *s->status != VIRTIO_NET_OK; 704 } 705 706 static int vhost_vdpa_net_load(NetClientState *nc) 707 { 708 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 709 struct vhost_vdpa *v = &s->vhost_vdpa; 710 const VirtIONet *n; 711 int r; 712 713 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 714 715 if (!v->shadow_vqs_enabled) { 716 return 0; 717 } 718 719 n = VIRTIO_NET(v->dev->vdev); 720 r = vhost_vdpa_net_load_mac(s, n); 721 if (unlikely(r < 0)) { 722 return r; 723 } 724 r = vhost_vdpa_net_load_mq(s, n); 725 if (unlikely(r)) { 726 return r; 727 } 728 r = vhost_vdpa_net_load_offloads(s, n); 729 if (unlikely(r)) { 730 return r; 731 } 732 733 return 0; 734 } 735 736 static NetClientInfo net_vhost_vdpa_cvq_info = { 737 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 738 .size = sizeof(VhostVDPAState), 739 .receive = vhost_vdpa_receive, 740 .start = vhost_vdpa_net_cvq_start, 741 .load = vhost_vdpa_net_load, 742 .stop = vhost_vdpa_net_cvq_stop, 743 .cleanup = vhost_vdpa_cleanup, 744 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 745 .has_ufo = vhost_vdpa_has_ufo, 746 .check_peer_type = vhost_vdpa_check_peer_type, 747 }; 748 749 /** 750 * Validate and copy control virtqueue commands. 751 * 752 * Following QEMU guidelines, we offer a copy of the buffers to the device to 753 * prevent TOCTOU bugs. 754 */ 755 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 756 VirtQueueElement *elem, 757 void *opaque) 758 { 759 VhostVDPAState *s = opaque; 760 size_t in_len; 761 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 762 /* Out buffer sent to both the vdpa device and the device model */ 763 struct iovec out = { 764 .iov_base = s->cvq_cmd_out_buffer, 765 }; 766 /* in buffer used for device model */ 767 const struct iovec in = { 768 .iov_base = &status, 769 .iov_len = sizeof(status), 770 }; 771 ssize_t dev_written = -EINVAL; 772 773 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 774 s->cvq_cmd_out_buffer, 775 vhost_vdpa_net_cvq_cmd_len()); 776 if (*(uint8_t *)s->cvq_cmd_out_buffer == VIRTIO_NET_CTRL_ANNOUNCE) { 777 /* 778 * Guest announce capability is emulated by qemu, so don't forward to 779 * the device. 780 */ 781 dev_written = sizeof(status); 782 *s->status = VIRTIO_NET_OK; 783 } else { 784 dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); 785 if (unlikely(dev_written < 0)) { 786 goto out; 787 } 788 } 789 790 if (unlikely(dev_written < sizeof(status))) { 791 error_report("Insufficient written data (%zu)", dev_written); 792 goto out; 793 } 794 795 if (*s->status != VIRTIO_NET_OK) { 796 return VIRTIO_NET_ERR; 797 } 798 799 status = VIRTIO_NET_ERR; 800 virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); 801 if (status != VIRTIO_NET_OK) { 802 error_report("Bad CVQ processing in model"); 803 } 804 805 out: 806 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 807 sizeof(status)); 808 if (unlikely(in_len < sizeof(status))) { 809 error_report("Bad device CVQ written length"); 810 } 811 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 812 g_free(elem); 813 return dev_written < 0 ? dev_written : 0; 814 } 815 816 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 817 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 818 }; 819 820 /** 821 * Probe if CVQ is isolated 822 * 823 * @device_fd The vdpa device fd 824 * @features Features offered by the device. 825 * @cvq_index The control vq pair index 826 * 827 * Returns <0 in case of failure, 0 if false and 1 if true. 828 */ 829 static int vhost_vdpa_probe_cvq_isolation(int device_fd, uint64_t features, 830 int cvq_index, Error **errp) 831 { 832 uint64_t backend_features; 833 int64_t cvq_group; 834 uint8_t status = VIRTIO_CONFIG_S_ACKNOWLEDGE | 835 VIRTIO_CONFIG_S_DRIVER | 836 VIRTIO_CONFIG_S_FEATURES_OK; 837 int r; 838 839 ERRP_GUARD(); 840 841 r = ioctl(device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features); 842 if (unlikely(r < 0)) { 843 error_setg_errno(errp, errno, "Cannot get vdpa backend_features"); 844 return r; 845 } 846 847 if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) { 848 return 0; 849 } 850 851 r = ioctl(device_fd, VHOST_SET_FEATURES, &features); 852 if (unlikely(r)) { 853 error_setg_errno(errp, errno, "Cannot set features"); 854 } 855 856 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 857 if (unlikely(r)) { 858 error_setg_errno(errp, -r, "Cannot set device features"); 859 goto out; 860 } 861 862 cvq_group = vhost_vdpa_get_vring_group(device_fd, cvq_index, errp); 863 if (unlikely(cvq_group < 0)) { 864 if (cvq_group != -ENOTSUP) { 865 r = cvq_group; 866 goto out; 867 } 868 869 /* 870 * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend 871 * support ASID even if the parent driver does not. The CVQ cannot be 872 * isolated in this case. 873 */ 874 error_free(*errp); 875 *errp = NULL; 876 r = 0; 877 goto out; 878 } 879 880 for (int i = 0; i < cvq_index; ++i) { 881 int64_t group = vhost_vdpa_get_vring_group(device_fd, i, errp); 882 if (unlikely(group < 0)) { 883 r = group; 884 goto out; 885 } 886 887 if (group == (int64_t)cvq_group) { 888 r = 0; 889 goto out; 890 } 891 } 892 893 r = 1; 894 895 out: 896 status = 0; 897 ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 898 return r; 899 } 900 901 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 902 const char *device, 903 const char *name, 904 int vdpa_device_fd, 905 int queue_pair_index, 906 int nvqs, 907 bool is_datapath, 908 bool svq, 909 struct vhost_vdpa_iova_range iova_range, 910 uint64_t features, 911 Error **errp) 912 { 913 NetClientState *nc = NULL; 914 VhostVDPAState *s; 915 int ret = 0; 916 assert(name); 917 int cvq_isolated; 918 919 if (is_datapath) { 920 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 921 name); 922 } else { 923 cvq_isolated = vhost_vdpa_probe_cvq_isolation(vdpa_device_fd, features, 924 queue_pair_index * 2, 925 errp); 926 if (unlikely(cvq_isolated < 0)) { 927 return NULL; 928 } 929 930 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 931 device, name); 932 } 933 qemu_set_info_str(nc, TYPE_VHOST_VDPA); 934 s = DO_UPCAST(VhostVDPAState, nc, nc); 935 936 s->vhost_vdpa.device_fd = vdpa_device_fd; 937 s->vhost_vdpa.index = queue_pair_index; 938 s->always_svq = svq; 939 s->migration_state.notify = vdpa_net_migration_state_notifier; 940 s->vhost_vdpa.shadow_vqs_enabled = svq; 941 s->vhost_vdpa.iova_range = iova_range; 942 s->vhost_vdpa.shadow_data = svq; 943 if (queue_pair_index == 0) { 944 vhost_vdpa_net_valid_svq_features(features, 945 &s->vhost_vdpa.migration_blocker); 946 } else if (!is_datapath) { 947 s->cvq_cmd_out_buffer = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 948 PROT_READ | PROT_WRITE, 949 MAP_SHARED | MAP_ANONYMOUS, -1, 0); 950 s->status = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 951 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 952 -1, 0); 953 954 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 955 s->vhost_vdpa.shadow_vq_ops_opaque = s; 956 s->cvq_isolated = cvq_isolated; 957 958 /* 959 * TODO: We cannot migrate devices with CVQ and no x-svq enabled as 960 * there is no way to set the device state (MAC, MQ, etc) before 961 * starting the datapath. 962 * 963 * Migration blocker ownership now belongs to s->vhost_vdpa. 964 */ 965 if (!svq) { 966 error_setg(&s->vhost_vdpa.migration_blocker, 967 "net vdpa cannot migrate with CVQ feature"); 968 } 969 } 970 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 971 if (ret) { 972 qemu_del_net_client(nc); 973 return NULL; 974 } 975 return nc; 976 } 977 978 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 979 { 980 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 981 if (unlikely(ret < 0)) { 982 error_setg_errno(errp, errno, 983 "Fail to query features from vhost-vDPA device"); 984 } 985 return ret; 986 } 987 988 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 989 int *has_cvq, Error **errp) 990 { 991 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 992 g_autofree struct vhost_vdpa_config *config = NULL; 993 __virtio16 *max_queue_pairs; 994 int ret; 995 996 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 997 *has_cvq = 1; 998 } else { 999 *has_cvq = 0; 1000 } 1001 1002 if (features & (1 << VIRTIO_NET_F_MQ)) { 1003 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 1004 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 1005 config->len = sizeof(*max_queue_pairs); 1006 1007 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 1008 if (ret) { 1009 error_setg(errp, "Fail to get config from vhost-vDPA device"); 1010 return -ret; 1011 } 1012 1013 max_queue_pairs = (__virtio16 *)&config->buf; 1014 1015 return lduw_le_p(max_queue_pairs); 1016 } 1017 1018 return 1; 1019 } 1020 1021 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 1022 NetClientState *peer, Error **errp) 1023 { 1024 const NetdevVhostVDPAOptions *opts; 1025 uint64_t features; 1026 int vdpa_device_fd; 1027 g_autofree NetClientState **ncs = NULL; 1028 struct vhost_vdpa_iova_range iova_range; 1029 NetClientState *nc; 1030 int queue_pairs, r, i = 0, has_cvq = 0; 1031 1032 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 1033 opts = &netdev->u.vhost_vdpa; 1034 if (!opts->vhostdev && !opts->vhostfd) { 1035 error_setg(errp, 1036 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); 1037 return -1; 1038 } 1039 1040 if (opts->vhostdev && opts->vhostfd) { 1041 error_setg(errp, 1042 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); 1043 return -1; 1044 } 1045 1046 if (opts->vhostdev) { 1047 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 1048 if (vdpa_device_fd == -1) { 1049 return -errno; 1050 } 1051 } else { 1052 /* has_vhostfd */ 1053 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); 1054 if (vdpa_device_fd == -1) { 1055 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); 1056 return -1; 1057 } 1058 } 1059 1060 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 1061 if (unlikely(r < 0)) { 1062 goto err; 1063 } 1064 1065 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 1066 &has_cvq, errp); 1067 if (queue_pairs < 0) { 1068 qemu_close(vdpa_device_fd); 1069 return queue_pairs; 1070 } 1071 1072 r = vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 1073 if (unlikely(r < 0)) { 1074 error_setg(errp, "vhost-vdpa: get iova range failed: %s", 1075 strerror(-r)); 1076 goto err; 1077 } 1078 1079 if (opts->x_svq && !vhost_vdpa_net_valid_svq_features(features, errp)) { 1080 goto err; 1081 } 1082 1083 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 1084 1085 for (i = 0; i < queue_pairs; i++) { 1086 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1087 vdpa_device_fd, i, 2, true, opts->x_svq, 1088 iova_range, features, errp); 1089 if (!ncs[i]) 1090 goto err; 1091 } 1092 1093 if (has_cvq) { 1094 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1095 vdpa_device_fd, i, 1, false, 1096 opts->x_svq, iova_range, features, errp); 1097 if (!nc) 1098 goto err; 1099 } 1100 1101 return 0; 1102 1103 err: 1104 if (i) { 1105 for (i--; i >= 0; i--) { 1106 qemu_del_net_client(ncs[i]); 1107 } 1108 } 1109 1110 qemu_close(vdpa_device_fd); 1111 1112 return -1; 1113 } 1114