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, *cvq_cmd_in_buffer; 39 bool started; 40 } VhostVDPAState; 41 42 const int vdpa_feature_bits[] = { 43 VIRTIO_F_NOTIFY_ON_EMPTY, 44 VIRTIO_RING_F_INDIRECT_DESC, 45 VIRTIO_RING_F_EVENT_IDX, 46 VIRTIO_F_ANY_LAYOUT, 47 VIRTIO_F_VERSION_1, 48 VIRTIO_NET_F_CSUM, 49 VIRTIO_NET_F_GUEST_CSUM, 50 VIRTIO_NET_F_GSO, 51 VIRTIO_NET_F_GUEST_TSO4, 52 VIRTIO_NET_F_GUEST_TSO6, 53 VIRTIO_NET_F_GUEST_ECN, 54 VIRTIO_NET_F_GUEST_UFO, 55 VIRTIO_NET_F_HOST_TSO4, 56 VIRTIO_NET_F_HOST_TSO6, 57 VIRTIO_NET_F_HOST_ECN, 58 VIRTIO_NET_F_HOST_UFO, 59 VIRTIO_NET_F_MRG_RXBUF, 60 VIRTIO_NET_F_MTU, 61 VIRTIO_NET_F_CTRL_RX, 62 VIRTIO_NET_F_CTRL_RX_EXTRA, 63 VIRTIO_NET_F_CTRL_VLAN, 64 VIRTIO_NET_F_GUEST_ANNOUNCE, 65 VIRTIO_NET_F_CTRL_MAC_ADDR, 66 VIRTIO_NET_F_RSS, 67 VIRTIO_NET_F_MQ, 68 VIRTIO_NET_F_CTRL_VQ, 69 VIRTIO_F_IOMMU_PLATFORM, 70 VIRTIO_F_RING_PACKED, 71 VIRTIO_NET_F_RSS, 72 VIRTIO_NET_F_HASH_REPORT, 73 VIRTIO_NET_F_GUEST_ANNOUNCE, 74 VIRTIO_NET_F_STATUS, 75 VHOST_INVALID_FEATURE_BIT 76 }; 77 78 /** Supported device specific feature bits with SVQ */ 79 static const uint64_t vdpa_svq_device_features = 80 BIT_ULL(VIRTIO_NET_F_CSUM) | 81 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | 82 BIT_ULL(VIRTIO_NET_F_MTU) | 83 BIT_ULL(VIRTIO_NET_F_MAC) | 84 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | 85 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | 86 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | 87 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | 88 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | 89 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | 90 BIT_ULL(VIRTIO_NET_F_HOST_ECN) | 91 BIT_ULL(VIRTIO_NET_F_HOST_UFO) | 92 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | 93 BIT_ULL(VIRTIO_NET_F_STATUS) | 94 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | 95 BIT_ULL(VIRTIO_F_ANY_LAYOUT) | 96 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | 97 BIT_ULL(VIRTIO_NET_F_RSC_EXT) | 98 BIT_ULL(VIRTIO_NET_F_STANDBY); 99 100 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 101 { 102 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 103 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 104 return s->vhost_net; 105 } 106 107 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 108 { 109 uint32_t device_id; 110 int ret; 111 struct vhost_dev *hdev; 112 113 hdev = (struct vhost_dev *)&net->dev; 114 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 115 if (device_id != VIRTIO_ID_NET) { 116 return -ENOTSUP; 117 } 118 return ret; 119 } 120 121 static int vhost_vdpa_add(NetClientState *ncs, void *be, 122 int queue_pair_index, int nvqs) 123 { 124 VhostNetOptions options; 125 struct vhost_net *net = NULL; 126 VhostVDPAState *s; 127 int ret; 128 129 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 130 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 131 s = DO_UPCAST(VhostVDPAState, nc, ncs); 132 options.net_backend = ncs; 133 options.opaque = be; 134 options.busyloop_timeout = 0; 135 options.nvqs = nvqs; 136 137 net = vhost_net_init(&options); 138 if (!net) { 139 error_report("failed to init vhost_net for queue"); 140 goto err_init; 141 } 142 s->vhost_net = net; 143 ret = vhost_vdpa_net_check_device_id(net); 144 if (ret) { 145 goto err_check; 146 } 147 return 0; 148 err_check: 149 vhost_net_cleanup(net); 150 g_free(net); 151 err_init: 152 return -1; 153 } 154 155 static void vhost_vdpa_cleanup(NetClientState *nc) 156 { 157 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 158 struct vhost_dev *dev = &s->vhost_net->dev; 159 160 qemu_vfree(s->cvq_cmd_out_buffer); 161 qemu_vfree(s->cvq_cmd_in_buffer); 162 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 163 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 164 } 165 if (s->vhost_net) { 166 vhost_net_cleanup(s->vhost_net); 167 g_free(s->vhost_net); 168 s->vhost_net = NULL; 169 } 170 if (s->vhost_vdpa.device_fd >= 0) { 171 qemu_close(s->vhost_vdpa.device_fd); 172 s->vhost_vdpa.device_fd = -1; 173 } 174 } 175 176 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 177 { 178 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 179 180 return true; 181 } 182 183 static bool vhost_vdpa_has_ufo(NetClientState *nc) 184 { 185 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 186 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 187 uint64_t features = 0; 188 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 189 features = vhost_net_get_features(s->vhost_net, features); 190 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 191 192 } 193 194 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 195 Error **errp) 196 { 197 const char *driver = object_class_get_name(oc); 198 199 if (!g_str_has_prefix(driver, "virtio-net-")) { 200 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 201 return false; 202 } 203 204 return true; 205 } 206 207 /** Dummy receive in case qemu falls back to userland tap networking */ 208 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 209 size_t size) 210 { 211 return 0; 212 } 213 214 static NetClientInfo net_vhost_vdpa_info = { 215 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 216 .size = sizeof(VhostVDPAState), 217 .receive = vhost_vdpa_receive, 218 .cleanup = vhost_vdpa_cleanup, 219 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 220 .has_ufo = vhost_vdpa_has_ufo, 221 .check_peer_type = vhost_vdpa_check_peer_type, 222 }; 223 224 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 225 { 226 VhostIOVATree *tree = v->iova_tree; 227 DMAMap needle = { 228 /* 229 * No need to specify size or to look for more translations since 230 * this contiguous chunk was allocated by us. 231 */ 232 .translated_addr = (hwaddr)(uintptr_t)addr, 233 }; 234 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 235 int r; 236 237 if (unlikely(!map)) { 238 error_report("Cannot locate expected map"); 239 return; 240 } 241 242 r = vhost_vdpa_dma_unmap(v, map->iova, map->size + 1); 243 if (unlikely(r != 0)) { 244 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 245 } 246 247 vhost_iova_tree_remove(tree, *map); 248 } 249 250 static size_t vhost_vdpa_net_cvq_cmd_len(void) 251 { 252 /* 253 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 254 * In buffer is always 1 byte, so it should fit here 255 */ 256 return sizeof(struct virtio_net_ctrl_hdr) + 257 2 * sizeof(struct virtio_net_ctrl_mac) + 258 MAC_TABLE_ENTRIES * ETH_ALEN; 259 } 260 261 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 262 { 263 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 264 } 265 266 /** Map CVQ buffer. */ 267 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 268 bool write) 269 { 270 DMAMap map = {}; 271 int r; 272 273 map.translated_addr = (hwaddr)(uintptr_t)buf; 274 map.size = size - 1; 275 map.perm = write ? IOMMU_RW : IOMMU_RO, 276 r = vhost_iova_tree_map_alloc(v->iova_tree, &map); 277 if (unlikely(r != IOVA_OK)) { 278 error_report("Cannot map injected element"); 279 return r; 280 } 281 282 r = vhost_vdpa_dma_map(v, map.iova, vhost_vdpa_net_cvq_cmd_page_len(), buf, 283 !write); 284 if (unlikely(r < 0)) { 285 goto dma_map_err; 286 } 287 288 return 0; 289 290 dma_map_err: 291 vhost_iova_tree_remove(v->iova_tree, map); 292 return r; 293 } 294 295 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 296 { 297 VhostVDPAState *s; 298 int r; 299 300 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 301 302 s = DO_UPCAST(VhostVDPAState, nc, nc); 303 if (!s->vhost_vdpa.shadow_vqs_enabled) { 304 return 0; 305 } 306 307 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 308 vhost_vdpa_net_cvq_cmd_page_len(), false); 309 if (unlikely(r < 0)) { 310 return r; 311 } 312 313 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer, 314 vhost_vdpa_net_cvq_cmd_page_len(), true); 315 if (unlikely(r < 0)) { 316 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 317 } 318 319 return r; 320 } 321 322 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 323 { 324 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 325 326 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 327 328 if (s->vhost_vdpa.shadow_vqs_enabled) { 329 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 330 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer); 331 } 332 } 333 334 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, 335 size_t in_len) 336 { 337 /* Buffers for the device */ 338 const struct iovec out = { 339 .iov_base = s->cvq_cmd_out_buffer, 340 .iov_len = out_len, 341 }; 342 const struct iovec in = { 343 .iov_base = s->cvq_cmd_in_buffer, 344 .iov_len = sizeof(virtio_net_ctrl_ack), 345 }; 346 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 347 int r; 348 349 r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); 350 if (unlikely(r != 0)) { 351 if (unlikely(r == -ENOSPC)) { 352 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 353 __func__); 354 } 355 return r; 356 } 357 358 /* 359 * We can poll here since we've had BQL from the time we sent the 360 * descriptor. Also, we need to take the answer before SVQ pulls by itself, 361 * when BQL is released 362 */ 363 return vhost_svq_poll(svq); 364 } 365 366 static int vhost_vdpa_net_load(NetClientState *nc) 367 { 368 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 369 const struct vhost_vdpa *v = &s->vhost_vdpa; 370 const VirtIONet *n; 371 uint64_t features; 372 373 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 374 375 if (!v->shadow_vqs_enabled) { 376 return 0; 377 } 378 379 n = VIRTIO_NET(v->dev->vdev); 380 features = n->parent_obj.guest_features; 381 if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) { 382 const struct virtio_net_ctrl_hdr ctrl = { 383 .class = VIRTIO_NET_CTRL_MAC, 384 .cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET, 385 }; 386 char *cursor = s->cvq_cmd_out_buffer; 387 ssize_t dev_written; 388 389 memcpy(cursor, &ctrl, sizeof(ctrl)); 390 cursor += sizeof(ctrl); 391 memcpy(cursor, n->mac, sizeof(n->mac)); 392 393 dev_written = vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + sizeof(n->mac), 394 sizeof(virtio_net_ctrl_ack)); 395 if (unlikely(dev_written < 0)) { 396 return dev_written; 397 } 398 399 return *((virtio_net_ctrl_ack *)s->cvq_cmd_in_buffer) != VIRTIO_NET_OK; 400 } 401 402 return 0; 403 } 404 405 static NetClientInfo net_vhost_vdpa_cvq_info = { 406 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 407 .size = sizeof(VhostVDPAState), 408 .receive = vhost_vdpa_receive, 409 .start = vhost_vdpa_net_cvq_start, 410 .load = vhost_vdpa_net_load, 411 .stop = vhost_vdpa_net_cvq_stop, 412 .cleanup = vhost_vdpa_cleanup, 413 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 414 .has_ufo = vhost_vdpa_has_ufo, 415 .check_peer_type = vhost_vdpa_check_peer_type, 416 }; 417 418 /** 419 * Do not forward commands not supported by SVQ. Otherwise, the device could 420 * accept it and qemu would not know how to update the device model. 421 */ 422 static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len) 423 { 424 struct virtio_net_ctrl_hdr ctrl; 425 426 if (unlikely(len < sizeof(ctrl))) { 427 qemu_log_mask(LOG_GUEST_ERROR, 428 "%s: invalid legnth of out buffer %zu\n", __func__, len); 429 return false; 430 } 431 432 memcpy(&ctrl, out_buf, sizeof(ctrl)); 433 switch (ctrl.class) { 434 case VIRTIO_NET_CTRL_MAC: 435 switch (ctrl.cmd) { 436 case VIRTIO_NET_CTRL_MAC_ADDR_SET: 437 return true; 438 default: 439 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mac cmd %u\n", 440 __func__, ctrl.cmd); 441 }; 442 break; 443 default: 444 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid control class %u\n", 445 __func__, ctrl.class); 446 }; 447 448 return false; 449 } 450 451 /** 452 * Validate and copy control virtqueue commands. 453 * 454 * Following QEMU guidelines, we offer a copy of the buffers to the device to 455 * prevent TOCTOU bugs. 456 */ 457 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 458 VirtQueueElement *elem, 459 void *opaque) 460 { 461 VhostVDPAState *s = opaque; 462 size_t in_len; 463 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 464 /* Out buffer sent to both the vdpa device and the device model */ 465 struct iovec out = { 466 .iov_base = s->cvq_cmd_out_buffer, 467 }; 468 /* in buffer used for device model */ 469 const struct iovec in = { 470 .iov_base = &status, 471 .iov_len = sizeof(status), 472 }; 473 ssize_t dev_written = -EINVAL; 474 bool ok; 475 476 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 477 s->cvq_cmd_out_buffer, 478 vhost_vdpa_net_cvq_cmd_len()); 479 ok = vhost_vdpa_net_cvq_validate_cmd(s->cvq_cmd_out_buffer, out.iov_len); 480 if (unlikely(!ok)) { 481 goto out; 482 } 483 484 dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); 485 if (unlikely(dev_written < 0)) { 486 goto out; 487 } 488 489 if (unlikely(dev_written < sizeof(status))) { 490 error_report("Insufficient written data (%zu)", dev_written); 491 goto out; 492 } 493 494 memcpy(&status, s->cvq_cmd_in_buffer, sizeof(status)); 495 if (status != VIRTIO_NET_OK) { 496 return VIRTIO_NET_ERR; 497 } 498 499 status = VIRTIO_NET_ERR; 500 virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); 501 if (status != VIRTIO_NET_OK) { 502 error_report("Bad CVQ processing in model"); 503 } 504 505 out: 506 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 507 sizeof(status)); 508 if (unlikely(in_len < sizeof(status))) { 509 error_report("Bad device CVQ written length"); 510 } 511 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 512 g_free(elem); 513 return dev_written < 0 ? dev_written : 0; 514 } 515 516 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 517 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 518 }; 519 520 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 521 const char *device, 522 const char *name, 523 int vdpa_device_fd, 524 int queue_pair_index, 525 int nvqs, 526 bool is_datapath, 527 bool svq, 528 VhostIOVATree *iova_tree) 529 { 530 NetClientState *nc = NULL; 531 VhostVDPAState *s; 532 int ret = 0; 533 assert(name); 534 if (is_datapath) { 535 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 536 name); 537 } else { 538 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 539 device, name); 540 } 541 snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); 542 s = DO_UPCAST(VhostVDPAState, nc, nc); 543 544 s->vhost_vdpa.device_fd = vdpa_device_fd; 545 s->vhost_vdpa.index = queue_pair_index; 546 s->vhost_vdpa.shadow_vqs_enabled = svq; 547 s->vhost_vdpa.iova_tree = iova_tree; 548 if (!is_datapath) { 549 s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(), 550 vhost_vdpa_net_cvq_cmd_page_len()); 551 memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); 552 s->cvq_cmd_in_buffer = qemu_memalign(qemu_real_host_page_size(), 553 vhost_vdpa_net_cvq_cmd_page_len()); 554 memset(s->cvq_cmd_in_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); 555 556 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 557 s->vhost_vdpa.shadow_vq_ops_opaque = s; 558 } 559 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 560 if (ret) { 561 qemu_del_net_client(nc); 562 return NULL; 563 } 564 return nc; 565 } 566 567 static int vhost_vdpa_get_iova_range(int fd, 568 struct vhost_vdpa_iova_range *iova_range) 569 { 570 int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); 571 572 return ret < 0 ? -errno : 0; 573 } 574 575 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 576 { 577 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 578 if (unlikely(ret < 0)) { 579 error_setg_errno(errp, errno, 580 "Fail to query features from vhost-vDPA device"); 581 } 582 return ret; 583 } 584 585 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 586 int *has_cvq, Error **errp) 587 { 588 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 589 g_autofree struct vhost_vdpa_config *config = NULL; 590 __virtio16 *max_queue_pairs; 591 int ret; 592 593 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 594 *has_cvq = 1; 595 } else { 596 *has_cvq = 0; 597 } 598 599 if (features & (1 << VIRTIO_NET_F_MQ)) { 600 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 601 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 602 config->len = sizeof(*max_queue_pairs); 603 604 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 605 if (ret) { 606 error_setg(errp, "Fail to get config from vhost-vDPA device"); 607 return -ret; 608 } 609 610 max_queue_pairs = (__virtio16 *)&config->buf; 611 612 return lduw_le_p(max_queue_pairs); 613 } 614 615 return 1; 616 } 617 618 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 619 NetClientState *peer, Error **errp) 620 { 621 const NetdevVhostVDPAOptions *opts; 622 uint64_t features; 623 int vdpa_device_fd; 624 g_autofree NetClientState **ncs = NULL; 625 g_autoptr(VhostIOVATree) iova_tree = NULL; 626 NetClientState *nc; 627 int queue_pairs, r, i = 0, has_cvq = 0; 628 629 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 630 opts = &netdev->u.vhost_vdpa; 631 if (!opts->vhostdev) { 632 error_setg(errp, "vdpa character device not specified with vhostdev"); 633 return -1; 634 } 635 636 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 637 if (vdpa_device_fd == -1) { 638 return -errno; 639 } 640 641 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 642 if (unlikely(r < 0)) { 643 goto err; 644 } 645 646 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 647 &has_cvq, errp); 648 if (queue_pairs < 0) { 649 qemu_close(vdpa_device_fd); 650 return queue_pairs; 651 } 652 653 if (opts->x_svq) { 654 struct vhost_vdpa_iova_range iova_range; 655 656 uint64_t invalid_dev_features = 657 features & ~vdpa_svq_device_features & 658 /* Transport are all accepted at this point */ 659 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 660 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 661 662 if (invalid_dev_features) { 663 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 664 invalid_dev_features); 665 goto err_svq; 666 } 667 668 vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 669 iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); 670 } 671 672 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 673 674 for (i = 0; i < queue_pairs; i++) { 675 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 676 vdpa_device_fd, i, 2, true, opts->x_svq, 677 iova_tree); 678 if (!ncs[i]) 679 goto err; 680 } 681 682 if (has_cvq) { 683 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 684 vdpa_device_fd, i, 1, false, 685 opts->x_svq, iova_tree); 686 if (!nc) 687 goto err; 688 } 689 690 /* iova_tree ownership belongs to last NetClientState */ 691 g_steal_pointer(&iova_tree); 692 return 0; 693 694 err: 695 if (i) { 696 for (i--; i >= 0; i--) { 697 qemu_del_net_client(ncs[i]); 698 } 699 } 700 701 err_svq: 702 qemu_close(vdpa_device_fd); 703 704 return -1; 705 } 706