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 "hw/virtio/vhost.h" 30 31 /* Todo:need to add the multiqueue support here */ 32 typedef struct VhostVDPAState { 33 NetClientState nc; 34 struct vhost_vdpa vhost_vdpa; 35 VHostNetState *vhost_net; 36 37 /* Control commands shadow buffers */ 38 void *cvq_cmd_out_buffer; 39 virtio_net_ctrl_ack *status; 40 41 /* The device always have SVQ enabled */ 42 bool always_svq; 43 bool started; 44 } VhostVDPAState; 45 46 const int vdpa_feature_bits[] = { 47 VIRTIO_F_NOTIFY_ON_EMPTY, 48 VIRTIO_RING_F_INDIRECT_DESC, 49 VIRTIO_RING_F_EVENT_IDX, 50 VIRTIO_F_ANY_LAYOUT, 51 VIRTIO_F_VERSION_1, 52 VIRTIO_NET_F_CSUM, 53 VIRTIO_NET_F_GUEST_CSUM, 54 VIRTIO_NET_F_GSO, 55 VIRTIO_NET_F_GUEST_TSO4, 56 VIRTIO_NET_F_GUEST_TSO6, 57 VIRTIO_NET_F_GUEST_ECN, 58 VIRTIO_NET_F_GUEST_UFO, 59 VIRTIO_NET_F_HOST_TSO4, 60 VIRTIO_NET_F_HOST_TSO6, 61 VIRTIO_NET_F_HOST_ECN, 62 VIRTIO_NET_F_HOST_UFO, 63 VIRTIO_NET_F_MRG_RXBUF, 64 VIRTIO_NET_F_MTU, 65 VIRTIO_NET_F_CTRL_RX, 66 VIRTIO_NET_F_CTRL_RX_EXTRA, 67 VIRTIO_NET_F_CTRL_VLAN, 68 VIRTIO_NET_F_CTRL_MAC_ADDR, 69 VIRTIO_NET_F_RSS, 70 VIRTIO_NET_F_MQ, 71 VIRTIO_NET_F_CTRL_VQ, 72 VIRTIO_F_IOMMU_PLATFORM, 73 VIRTIO_F_RING_PACKED, 74 VIRTIO_F_RING_RESET, 75 VIRTIO_NET_F_RSS, 76 VIRTIO_NET_F_HASH_REPORT, 77 VIRTIO_NET_F_GUEST_ANNOUNCE, 78 VIRTIO_NET_F_STATUS, 79 VHOST_INVALID_FEATURE_BIT 80 }; 81 82 /** Supported device specific feature bits with SVQ */ 83 static const uint64_t vdpa_svq_device_features = 84 BIT_ULL(VIRTIO_NET_F_CSUM) | 85 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | 86 BIT_ULL(VIRTIO_NET_F_MTU) | 87 BIT_ULL(VIRTIO_NET_F_MAC) | 88 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | 89 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | 90 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | 91 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | 92 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | 93 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | 94 BIT_ULL(VIRTIO_NET_F_HOST_ECN) | 95 BIT_ULL(VIRTIO_NET_F_HOST_UFO) | 96 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | 97 BIT_ULL(VIRTIO_NET_F_STATUS) | 98 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | 99 BIT_ULL(VIRTIO_NET_F_MQ) | 100 BIT_ULL(VIRTIO_F_ANY_LAYOUT) | 101 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | 102 BIT_ULL(VIRTIO_NET_F_RSC_EXT) | 103 BIT_ULL(VIRTIO_NET_F_STANDBY); 104 105 #define VHOST_VDPA_NET_CVQ_ASID 1 106 107 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 108 { 109 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 110 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 111 return s->vhost_net; 112 } 113 114 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) 115 { 116 uint64_t invalid_dev_features = 117 features & ~vdpa_svq_device_features & 118 /* Transport are all accepted at this point */ 119 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 120 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 121 122 if (invalid_dev_features) { 123 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 124 invalid_dev_features); 125 return false; 126 } 127 128 return vhost_svq_valid_features(features, errp); 129 } 130 131 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 132 { 133 uint32_t device_id; 134 int ret; 135 struct vhost_dev *hdev; 136 137 hdev = (struct vhost_dev *)&net->dev; 138 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 139 if (device_id != VIRTIO_ID_NET) { 140 return -ENOTSUP; 141 } 142 return ret; 143 } 144 145 static int vhost_vdpa_add(NetClientState *ncs, void *be, 146 int queue_pair_index, int nvqs) 147 { 148 VhostNetOptions options; 149 struct vhost_net *net = NULL; 150 VhostVDPAState *s; 151 int ret; 152 153 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 154 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 155 s = DO_UPCAST(VhostVDPAState, nc, ncs); 156 options.net_backend = ncs; 157 options.opaque = be; 158 options.busyloop_timeout = 0; 159 options.nvqs = nvqs; 160 161 net = vhost_net_init(&options); 162 if (!net) { 163 error_report("failed to init vhost_net for queue"); 164 goto err_init; 165 } 166 s->vhost_net = net; 167 ret = vhost_vdpa_net_check_device_id(net); 168 if (ret) { 169 goto err_check; 170 } 171 return 0; 172 err_check: 173 vhost_net_cleanup(net); 174 g_free(net); 175 err_init: 176 return -1; 177 } 178 179 static void vhost_vdpa_cleanup(NetClientState *nc) 180 { 181 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 182 struct vhost_dev *dev = &s->vhost_net->dev; 183 184 qemu_vfree(s->cvq_cmd_out_buffer); 185 qemu_vfree(s->status); 186 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 187 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 188 } 189 if (s->vhost_net) { 190 vhost_net_cleanup(s->vhost_net); 191 g_free(s->vhost_net); 192 s->vhost_net = NULL; 193 } 194 if (s->vhost_vdpa.device_fd >= 0) { 195 qemu_close(s->vhost_vdpa.device_fd); 196 s->vhost_vdpa.device_fd = -1; 197 } 198 } 199 200 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 201 { 202 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 203 204 return true; 205 } 206 207 static bool vhost_vdpa_has_ufo(NetClientState *nc) 208 { 209 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 210 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 211 uint64_t features = 0; 212 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 213 features = vhost_net_get_features(s->vhost_net, features); 214 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 215 216 } 217 218 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 219 Error **errp) 220 { 221 const char *driver = object_class_get_name(oc); 222 223 if (!g_str_has_prefix(driver, "virtio-net-")) { 224 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 225 return false; 226 } 227 228 return true; 229 } 230 231 /** Dummy receive in case qemu falls back to userland tap networking */ 232 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 233 size_t size) 234 { 235 return size; 236 } 237 238 static NetClientInfo net_vhost_vdpa_info = { 239 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 240 .size = sizeof(VhostVDPAState), 241 .receive = vhost_vdpa_receive, 242 .cleanup = vhost_vdpa_cleanup, 243 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 244 .has_ufo = vhost_vdpa_has_ufo, 245 .check_peer_type = vhost_vdpa_check_peer_type, 246 }; 247 248 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index) 249 { 250 struct vhost_vring_state state = { 251 .index = vq_index, 252 }; 253 int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state); 254 255 if (unlikely(r < 0)) { 256 error_report("Cannot get VQ %u group: %s", vq_index, 257 g_strerror(errno)); 258 return r; 259 } 260 261 return state.num; 262 } 263 264 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, 265 unsigned vq_group, 266 unsigned asid_num) 267 { 268 struct vhost_vring_state asid = { 269 .index = vq_group, 270 .num = asid_num, 271 }; 272 int r; 273 274 r = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); 275 if (unlikely(r < 0)) { 276 error_report("Can't set vq group %u asid %u, errno=%d (%s)", 277 asid.index, asid.num, errno, g_strerror(errno)); 278 } 279 return r; 280 } 281 282 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 283 { 284 VhostIOVATree *tree = v->iova_tree; 285 DMAMap needle = { 286 /* 287 * No need to specify size or to look for more translations since 288 * this contiguous chunk was allocated by us. 289 */ 290 .translated_addr = (hwaddr)(uintptr_t)addr, 291 }; 292 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 293 int r; 294 295 if (unlikely(!map)) { 296 error_report("Cannot locate expected map"); 297 return; 298 } 299 300 r = vhost_vdpa_dma_unmap(v, v->address_space_id, map->iova, map->size + 1); 301 if (unlikely(r != 0)) { 302 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 303 } 304 305 vhost_iova_tree_remove(tree, *map); 306 } 307 308 static size_t vhost_vdpa_net_cvq_cmd_len(void) 309 { 310 /* 311 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 312 * In buffer is always 1 byte, so it should fit here 313 */ 314 return sizeof(struct virtio_net_ctrl_hdr) + 315 2 * sizeof(struct virtio_net_ctrl_mac) + 316 MAC_TABLE_ENTRIES * ETH_ALEN; 317 } 318 319 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 320 { 321 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 322 } 323 324 /** Map CVQ buffer. */ 325 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 326 bool write) 327 { 328 DMAMap map = {}; 329 int r; 330 331 map.translated_addr = (hwaddr)(uintptr_t)buf; 332 map.size = size - 1; 333 map.perm = write ? IOMMU_RW : IOMMU_RO, 334 r = vhost_iova_tree_map_alloc(v->iova_tree, &map); 335 if (unlikely(r != IOVA_OK)) { 336 error_report("Cannot map injected element"); 337 return r; 338 } 339 340 r = vhost_vdpa_dma_map(v, v->address_space_id, map.iova, 341 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); 342 if (unlikely(r < 0)) { 343 goto dma_map_err; 344 } 345 346 return 0; 347 348 dma_map_err: 349 vhost_iova_tree_remove(v->iova_tree, map); 350 return r; 351 } 352 353 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 354 { 355 VhostVDPAState *s; 356 struct vhost_vdpa *v; 357 uint64_t backend_features; 358 int64_t cvq_group; 359 int cvq_index, r; 360 361 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 362 363 s = DO_UPCAST(VhostVDPAState, nc, nc); 364 v = &s->vhost_vdpa; 365 366 v->shadow_data = s->always_svq; 367 v->shadow_vqs_enabled = s->always_svq; 368 s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID; 369 370 if (s->always_svq) { 371 /* SVQ is already configured for all virtqueues */ 372 goto out; 373 } 374 375 /* 376 * If we early return in these cases SVQ will not be enabled. The migration 377 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG. 378 * 379 * Calling VHOST_GET_BACKEND_FEATURES as they are not available in v->dev 380 * yet. 381 */ 382 r = ioctl(v->device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features); 383 if (unlikely(r < 0)) { 384 error_report("Cannot get vdpa backend_features: %s(%d)", 385 g_strerror(errno), errno); 386 return -1; 387 } 388 if (!(backend_features & VHOST_BACKEND_F_IOTLB_ASID) || 389 !vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) { 390 return 0; 391 } 392 393 /* 394 * Check if all the virtqueues of the virtio device are in a different vq 395 * than the last vq. VQ group of last group passed in cvq_group. 396 */ 397 cvq_index = v->dev->vq_index_end - 1; 398 cvq_group = vhost_vdpa_get_vring_group(v->device_fd, cvq_index); 399 if (unlikely(cvq_group < 0)) { 400 return cvq_group; 401 } 402 for (int i = 0; i < cvq_index; ++i) { 403 int64_t group = vhost_vdpa_get_vring_group(v->device_fd, i); 404 405 if (unlikely(group < 0)) { 406 return group; 407 } 408 409 if (group == cvq_group) { 410 return 0; 411 } 412 } 413 414 r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID); 415 if (unlikely(r < 0)) { 416 return r; 417 } 418 419 v->iova_tree = vhost_iova_tree_new(v->iova_range.first, 420 v->iova_range.last); 421 v->shadow_vqs_enabled = true; 422 s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; 423 424 out: 425 if (!s->vhost_vdpa.shadow_vqs_enabled) { 426 return 0; 427 } 428 429 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 430 vhost_vdpa_net_cvq_cmd_page_len(), false); 431 if (unlikely(r < 0)) { 432 return r; 433 } 434 435 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, 436 vhost_vdpa_net_cvq_cmd_page_len(), true); 437 if (unlikely(r < 0)) { 438 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 439 } 440 441 return r; 442 } 443 444 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 445 { 446 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 447 448 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 449 450 if (s->vhost_vdpa.shadow_vqs_enabled) { 451 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 452 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); 453 if (!s->always_svq) { 454 /* 455 * If only the CVQ is shadowed we can delete this safely. 456 * If all the VQs are shadows this will be needed by the time the 457 * device is started again to register SVQ vrings and similar. 458 */ 459 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 460 } 461 } 462 } 463 464 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, 465 size_t in_len) 466 { 467 /* Buffers for the device */ 468 const struct iovec out = { 469 .iov_base = s->cvq_cmd_out_buffer, 470 .iov_len = out_len, 471 }; 472 const struct iovec in = { 473 .iov_base = s->status, 474 .iov_len = sizeof(virtio_net_ctrl_ack), 475 }; 476 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 477 int r; 478 479 r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); 480 if (unlikely(r != 0)) { 481 if (unlikely(r == -ENOSPC)) { 482 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 483 __func__); 484 } 485 return r; 486 } 487 488 /* 489 * We can poll here since we've had BQL from the time we sent the 490 * descriptor. Also, we need to take the answer before SVQ pulls by itself, 491 * when BQL is released 492 */ 493 return vhost_svq_poll(svq); 494 } 495 496 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, 497 uint8_t cmd, const void *data, 498 size_t data_size) 499 { 500 const struct virtio_net_ctrl_hdr ctrl = { 501 .class = class, 502 .cmd = cmd, 503 }; 504 505 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); 506 507 memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); 508 memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); 509 510 return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, 511 sizeof(virtio_net_ctrl_ack)); 512 } 513 514 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) 515 { 516 uint64_t features = n->parent_obj.guest_features; 517 if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) { 518 ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC, 519 VIRTIO_NET_CTRL_MAC_ADDR_SET, 520 n->mac, sizeof(n->mac)); 521 if (unlikely(dev_written < 0)) { 522 return dev_written; 523 } 524 525 return *s->status != VIRTIO_NET_OK; 526 } 527 528 return 0; 529 } 530 531 static int vhost_vdpa_net_load_mq(VhostVDPAState *s, 532 const VirtIONet *n) 533 { 534 struct virtio_net_ctrl_mq mq; 535 uint64_t features = n->parent_obj.guest_features; 536 ssize_t dev_written; 537 538 if (!(features & BIT_ULL(VIRTIO_NET_F_MQ))) { 539 return 0; 540 } 541 542 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); 543 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ, 544 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq, 545 sizeof(mq)); 546 if (unlikely(dev_written < 0)) { 547 return dev_written; 548 } 549 550 return *s->status != VIRTIO_NET_OK; 551 } 552 553 static int vhost_vdpa_net_load(NetClientState *nc) 554 { 555 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 556 struct vhost_vdpa *v = &s->vhost_vdpa; 557 const VirtIONet *n; 558 int r; 559 560 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 561 562 if (!v->shadow_vqs_enabled) { 563 return 0; 564 } 565 566 n = VIRTIO_NET(v->dev->vdev); 567 r = vhost_vdpa_net_load_mac(s, n); 568 if (unlikely(r < 0)) { 569 return r; 570 } 571 r = vhost_vdpa_net_load_mq(s, n); 572 if (unlikely(r)) { 573 return r; 574 } 575 576 return 0; 577 } 578 579 static NetClientInfo net_vhost_vdpa_cvq_info = { 580 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 581 .size = sizeof(VhostVDPAState), 582 .receive = vhost_vdpa_receive, 583 .start = vhost_vdpa_net_cvq_start, 584 .load = vhost_vdpa_net_load, 585 .stop = vhost_vdpa_net_cvq_stop, 586 .cleanup = vhost_vdpa_cleanup, 587 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 588 .has_ufo = vhost_vdpa_has_ufo, 589 .check_peer_type = vhost_vdpa_check_peer_type, 590 }; 591 592 /** 593 * Validate and copy control virtqueue commands. 594 * 595 * Following QEMU guidelines, we offer a copy of the buffers to the device to 596 * prevent TOCTOU bugs. 597 */ 598 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 599 VirtQueueElement *elem, 600 void *opaque) 601 { 602 VhostVDPAState *s = opaque; 603 size_t in_len; 604 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 605 /* Out buffer sent to both the vdpa device and the device model */ 606 struct iovec out = { 607 .iov_base = s->cvq_cmd_out_buffer, 608 }; 609 /* in buffer used for device model */ 610 const struct iovec in = { 611 .iov_base = &status, 612 .iov_len = sizeof(status), 613 }; 614 ssize_t dev_written = -EINVAL; 615 616 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 617 s->cvq_cmd_out_buffer, 618 vhost_vdpa_net_cvq_cmd_len()); 619 if (*(uint8_t *)s->cvq_cmd_out_buffer == VIRTIO_NET_CTRL_ANNOUNCE) { 620 /* 621 * Guest announce capability is emulated by qemu, so don't forward to 622 * the device. 623 */ 624 dev_written = sizeof(status); 625 *s->status = VIRTIO_NET_OK; 626 } else { 627 dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); 628 if (unlikely(dev_written < 0)) { 629 goto out; 630 } 631 } 632 633 if (unlikely(dev_written < sizeof(status))) { 634 error_report("Insufficient written data (%zu)", dev_written); 635 goto out; 636 } 637 638 if (*s->status != VIRTIO_NET_OK) { 639 return VIRTIO_NET_ERR; 640 } 641 642 status = VIRTIO_NET_ERR; 643 virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); 644 if (status != VIRTIO_NET_OK) { 645 error_report("Bad CVQ processing in model"); 646 } 647 648 out: 649 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 650 sizeof(status)); 651 if (unlikely(in_len < sizeof(status))) { 652 error_report("Bad device CVQ written length"); 653 } 654 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 655 g_free(elem); 656 return dev_written < 0 ? dev_written : 0; 657 } 658 659 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 660 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 661 }; 662 663 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 664 const char *device, 665 const char *name, 666 int vdpa_device_fd, 667 int queue_pair_index, 668 int nvqs, 669 bool is_datapath, 670 bool svq, 671 struct vhost_vdpa_iova_range iova_range, 672 VhostIOVATree *iova_tree) 673 { 674 NetClientState *nc = NULL; 675 VhostVDPAState *s; 676 int ret = 0; 677 assert(name); 678 if (is_datapath) { 679 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 680 name); 681 } else { 682 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 683 device, name); 684 } 685 qemu_set_info_str(nc, TYPE_VHOST_VDPA); 686 s = DO_UPCAST(VhostVDPAState, nc, nc); 687 688 s->vhost_vdpa.device_fd = vdpa_device_fd; 689 s->vhost_vdpa.index = queue_pair_index; 690 s->always_svq = svq; 691 s->vhost_vdpa.shadow_vqs_enabled = svq; 692 s->vhost_vdpa.iova_range = iova_range; 693 s->vhost_vdpa.shadow_data = svq; 694 s->vhost_vdpa.iova_tree = iova_tree; 695 if (!is_datapath) { 696 s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(), 697 vhost_vdpa_net_cvq_cmd_page_len()); 698 memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); 699 s->status = qemu_memalign(qemu_real_host_page_size(), 700 vhost_vdpa_net_cvq_cmd_page_len()); 701 memset(s->status, 0, vhost_vdpa_net_cvq_cmd_page_len()); 702 703 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 704 s->vhost_vdpa.shadow_vq_ops_opaque = s; 705 } 706 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 707 if (ret) { 708 qemu_del_net_client(nc); 709 return NULL; 710 } 711 return nc; 712 } 713 714 static int vhost_vdpa_get_iova_range(int fd, 715 struct vhost_vdpa_iova_range *iova_range) 716 { 717 int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); 718 719 return ret < 0 ? -errno : 0; 720 } 721 722 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 723 { 724 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 725 if (unlikely(ret < 0)) { 726 error_setg_errno(errp, errno, 727 "Fail to query features from vhost-vDPA device"); 728 } 729 return ret; 730 } 731 732 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 733 int *has_cvq, Error **errp) 734 { 735 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 736 g_autofree struct vhost_vdpa_config *config = NULL; 737 __virtio16 *max_queue_pairs; 738 int ret; 739 740 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 741 *has_cvq = 1; 742 } else { 743 *has_cvq = 0; 744 } 745 746 if (features & (1 << VIRTIO_NET_F_MQ)) { 747 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 748 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 749 config->len = sizeof(*max_queue_pairs); 750 751 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 752 if (ret) { 753 error_setg(errp, "Fail to get config from vhost-vDPA device"); 754 return -ret; 755 } 756 757 max_queue_pairs = (__virtio16 *)&config->buf; 758 759 return lduw_le_p(max_queue_pairs); 760 } 761 762 return 1; 763 } 764 765 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 766 NetClientState *peer, Error **errp) 767 { 768 const NetdevVhostVDPAOptions *opts; 769 uint64_t features; 770 int vdpa_device_fd; 771 g_autofree NetClientState **ncs = NULL; 772 g_autoptr(VhostIOVATree) iova_tree = NULL; 773 struct vhost_vdpa_iova_range iova_range; 774 NetClientState *nc; 775 int queue_pairs, r, i = 0, has_cvq = 0; 776 777 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 778 opts = &netdev->u.vhost_vdpa; 779 if (!opts->vhostdev && !opts->vhostfd) { 780 error_setg(errp, 781 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); 782 return -1; 783 } 784 785 if (opts->vhostdev && opts->vhostfd) { 786 error_setg(errp, 787 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); 788 return -1; 789 } 790 791 if (opts->vhostdev) { 792 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 793 if (vdpa_device_fd == -1) { 794 return -errno; 795 } 796 } else { 797 /* has_vhostfd */ 798 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); 799 if (vdpa_device_fd == -1) { 800 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); 801 return -1; 802 } 803 } 804 805 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 806 if (unlikely(r < 0)) { 807 goto err; 808 } 809 810 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 811 &has_cvq, errp); 812 if (queue_pairs < 0) { 813 qemu_close(vdpa_device_fd); 814 return queue_pairs; 815 } 816 817 vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 818 if (opts->x_svq) { 819 if (!vhost_vdpa_net_valid_svq_features(features, errp)) { 820 goto err_svq; 821 } 822 823 iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); 824 } 825 826 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 827 828 for (i = 0; i < queue_pairs; i++) { 829 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 830 vdpa_device_fd, i, 2, true, opts->x_svq, 831 iova_range, iova_tree); 832 if (!ncs[i]) 833 goto err; 834 } 835 836 if (has_cvq) { 837 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 838 vdpa_device_fd, i, 1, false, 839 opts->x_svq, iova_range, iova_tree); 840 if (!nc) 841 goto err; 842 } 843 844 /* iova_tree ownership belongs to last NetClientState */ 845 g_steal_pointer(&iova_tree); 846 return 0; 847 848 err: 849 if (i) { 850 for (i--; i >= 0; i--) { 851 qemu_del_net_client(ncs[i]); 852 } 853 } 854 855 err_svq: 856 qemu_close(vdpa_device_fd); 857 858 return -1; 859 } 860