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 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 106 { 107 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 108 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 109 return s->vhost_net; 110 } 111 112 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) 113 { 114 uint64_t invalid_dev_features = 115 features & ~vdpa_svq_device_features & 116 /* Transport are all accepted at this point */ 117 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 118 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 119 120 if (invalid_dev_features) { 121 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 122 invalid_dev_features); 123 return false; 124 } 125 126 return vhost_svq_valid_features(features, errp); 127 } 128 129 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 130 { 131 uint32_t device_id; 132 int ret; 133 struct vhost_dev *hdev; 134 135 hdev = (struct vhost_dev *)&net->dev; 136 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 137 if (device_id != VIRTIO_ID_NET) { 138 return -ENOTSUP; 139 } 140 return ret; 141 } 142 143 static int vhost_vdpa_add(NetClientState *ncs, void *be, 144 int queue_pair_index, int nvqs) 145 { 146 VhostNetOptions options; 147 struct vhost_net *net = NULL; 148 VhostVDPAState *s; 149 int ret; 150 151 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 152 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 153 s = DO_UPCAST(VhostVDPAState, nc, ncs); 154 options.net_backend = ncs; 155 options.opaque = be; 156 options.busyloop_timeout = 0; 157 options.nvqs = nvqs; 158 159 net = vhost_net_init(&options); 160 if (!net) { 161 error_report("failed to init vhost_net for queue"); 162 goto err_init; 163 } 164 s->vhost_net = net; 165 ret = vhost_vdpa_net_check_device_id(net); 166 if (ret) { 167 goto err_check; 168 } 169 return 0; 170 err_check: 171 vhost_net_cleanup(net); 172 g_free(net); 173 err_init: 174 return -1; 175 } 176 177 static void vhost_vdpa_cleanup(NetClientState *nc) 178 { 179 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 180 struct vhost_dev *dev = &s->vhost_net->dev; 181 182 qemu_vfree(s->cvq_cmd_out_buffer); 183 qemu_vfree(s->status); 184 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 185 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 186 } 187 if (s->vhost_net) { 188 vhost_net_cleanup(s->vhost_net); 189 g_free(s->vhost_net); 190 s->vhost_net = NULL; 191 } 192 if (s->vhost_vdpa.device_fd >= 0) { 193 qemu_close(s->vhost_vdpa.device_fd); 194 s->vhost_vdpa.device_fd = -1; 195 } 196 } 197 198 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 199 { 200 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 201 202 return true; 203 } 204 205 static bool vhost_vdpa_has_ufo(NetClientState *nc) 206 { 207 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 208 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 209 uint64_t features = 0; 210 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 211 features = vhost_net_get_features(s->vhost_net, features); 212 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 213 214 } 215 216 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 217 Error **errp) 218 { 219 const char *driver = object_class_get_name(oc); 220 221 if (!g_str_has_prefix(driver, "virtio-net-")) { 222 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 223 return false; 224 } 225 226 return true; 227 } 228 229 /** Dummy receive in case qemu falls back to userland tap networking */ 230 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 231 size_t size) 232 { 233 return size; 234 } 235 236 static NetClientInfo net_vhost_vdpa_info = { 237 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 238 .size = sizeof(VhostVDPAState), 239 .receive = vhost_vdpa_receive, 240 .cleanup = vhost_vdpa_cleanup, 241 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 242 .has_ufo = vhost_vdpa_has_ufo, 243 .check_peer_type = vhost_vdpa_check_peer_type, 244 }; 245 246 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 247 { 248 VhostIOVATree *tree = v->iova_tree; 249 DMAMap needle = { 250 /* 251 * No need to specify size or to look for more translations since 252 * this contiguous chunk was allocated by us. 253 */ 254 .translated_addr = (hwaddr)(uintptr_t)addr, 255 }; 256 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 257 int r; 258 259 if (unlikely(!map)) { 260 error_report("Cannot locate expected map"); 261 return; 262 } 263 264 r = vhost_vdpa_dma_unmap(v, v->address_space_id, map->iova, map->size + 1); 265 if (unlikely(r != 0)) { 266 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 267 } 268 269 vhost_iova_tree_remove(tree, *map); 270 } 271 272 static size_t vhost_vdpa_net_cvq_cmd_len(void) 273 { 274 /* 275 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 276 * In buffer is always 1 byte, so it should fit here 277 */ 278 return sizeof(struct virtio_net_ctrl_hdr) + 279 2 * sizeof(struct virtio_net_ctrl_mac) + 280 MAC_TABLE_ENTRIES * ETH_ALEN; 281 } 282 283 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 284 { 285 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 286 } 287 288 /** Map CVQ buffer. */ 289 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 290 bool write) 291 { 292 DMAMap map = {}; 293 int r; 294 295 map.translated_addr = (hwaddr)(uintptr_t)buf; 296 map.size = size - 1; 297 map.perm = write ? IOMMU_RW : IOMMU_RO, 298 r = vhost_iova_tree_map_alloc(v->iova_tree, &map); 299 if (unlikely(r != IOVA_OK)) { 300 error_report("Cannot map injected element"); 301 return r; 302 } 303 304 r = vhost_vdpa_dma_map(v, v->address_space_id, map.iova, 305 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); 306 if (unlikely(r < 0)) { 307 goto dma_map_err; 308 } 309 310 return 0; 311 312 dma_map_err: 313 vhost_iova_tree_remove(v->iova_tree, map); 314 return r; 315 } 316 317 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 318 { 319 VhostVDPAState *s; 320 int r; 321 322 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 323 324 s = DO_UPCAST(VhostVDPAState, nc, nc); 325 if (!s->vhost_vdpa.shadow_vqs_enabled) { 326 return 0; 327 } 328 329 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 330 vhost_vdpa_net_cvq_cmd_page_len(), false); 331 if (unlikely(r < 0)) { 332 return r; 333 } 334 335 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, 336 vhost_vdpa_net_cvq_cmd_page_len(), true); 337 if (unlikely(r < 0)) { 338 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 339 } 340 341 return r; 342 } 343 344 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 345 { 346 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 347 348 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 349 350 if (s->vhost_vdpa.shadow_vqs_enabled) { 351 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 352 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); 353 } 354 } 355 356 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, 357 size_t in_len) 358 { 359 /* Buffers for the device */ 360 const struct iovec out = { 361 .iov_base = s->cvq_cmd_out_buffer, 362 .iov_len = out_len, 363 }; 364 const struct iovec in = { 365 .iov_base = s->status, 366 .iov_len = sizeof(virtio_net_ctrl_ack), 367 }; 368 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 369 int r; 370 371 r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); 372 if (unlikely(r != 0)) { 373 if (unlikely(r == -ENOSPC)) { 374 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 375 __func__); 376 } 377 return r; 378 } 379 380 /* 381 * We can poll here since we've had BQL from the time we sent the 382 * descriptor. Also, we need to take the answer before SVQ pulls by itself, 383 * when BQL is released 384 */ 385 return vhost_svq_poll(svq); 386 } 387 388 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, 389 uint8_t cmd, const void *data, 390 size_t data_size) 391 { 392 const struct virtio_net_ctrl_hdr ctrl = { 393 .class = class, 394 .cmd = cmd, 395 }; 396 397 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); 398 399 memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); 400 memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); 401 402 return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, 403 sizeof(virtio_net_ctrl_ack)); 404 } 405 406 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) 407 { 408 uint64_t features = n->parent_obj.guest_features; 409 if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) { 410 ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC, 411 VIRTIO_NET_CTRL_MAC_ADDR_SET, 412 n->mac, sizeof(n->mac)); 413 if (unlikely(dev_written < 0)) { 414 return dev_written; 415 } 416 417 return *s->status != VIRTIO_NET_OK; 418 } 419 420 return 0; 421 } 422 423 static int vhost_vdpa_net_load_mq(VhostVDPAState *s, 424 const VirtIONet *n) 425 { 426 struct virtio_net_ctrl_mq mq; 427 uint64_t features = n->parent_obj.guest_features; 428 ssize_t dev_written; 429 430 if (!(features & BIT_ULL(VIRTIO_NET_F_MQ))) { 431 return 0; 432 } 433 434 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); 435 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ, 436 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq, 437 sizeof(mq)); 438 if (unlikely(dev_written < 0)) { 439 return dev_written; 440 } 441 442 return *s->status != VIRTIO_NET_OK; 443 } 444 445 static int vhost_vdpa_net_load(NetClientState *nc) 446 { 447 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 448 struct vhost_vdpa *v = &s->vhost_vdpa; 449 const VirtIONet *n; 450 int r; 451 452 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 453 454 if (!v->shadow_vqs_enabled) { 455 return 0; 456 } 457 458 n = VIRTIO_NET(v->dev->vdev); 459 r = vhost_vdpa_net_load_mac(s, n); 460 if (unlikely(r < 0)) { 461 return r; 462 } 463 r = vhost_vdpa_net_load_mq(s, n); 464 if (unlikely(r)) { 465 return r; 466 } 467 468 return 0; 469 } 470 471 static NetClientInfo net_vhost_vdpa_cvq_info = { 472 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 473 .size = sizeof(VhostVDPAState), 474 .receive = vhost_vdpa_receive, 475 .start = vhost_vdpa_net_cvq_start, 476 .load = vhost_vdpa_net_load, 477 .stop = vhost_vdpa_net_cvq_stop, 478 .cleanup = vhost_vdpa_cleanup, 479 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 480 .has_ufo = vhost_vdpa_has_ufo, 481 .check_peer_type = vhost_vdpa_check_peer_type, 482 }; 483 484 /** 485 * Validate and copy control virtqueue commands. 486 * 487 * Following QEMU guidelines, we offer a copy of the buffers to the device to 488 * prevent TOCTOU bugs. 489 */ 490 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 491 VirtQueueElement *elem, 492 void *opaque) 493 { 494 VhostVDPAState *s = opaque; 495 size_t in_len; 496 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 497 /* Out buffer sent to both the vdpa device and the device model */ 498 struct iovec out = { 499 .iov_base = s->cvq_cmd_out_buffer, 500 }; 501 /* in buffer used for device model */ 502 const struct iovec in = { 503 .iov_base = &status, 504 .iov_len = sizeof(status), 505 }; 506 ssize_t dev_written = -EINVAL; 507 508 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 509 s->cvq_cmd_out_buffer, 510 vhost_vdpa_net_cvq_cmd_len()); 511 dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); 512 if (unlikely(dev_written < 0)) { 513 goto out; 514 } 515 516 if (unlikely(dev_written < sizeof(status))) { 517 error_report("Insufficient written data (%zu)", dev_written); 518 goto out; 519 } 520 521 if (*s->status != VIRTIO_NET_OK) { 522 return VIRTIO_NET_ERR; 523 } 524 525 status = VIRTIO_NET_ERR; 526 virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); 527 if (status != VIRTIO_NET_OK) { 528 error_report("Bad CVQ processing in model"); 529 } 530 531 out: 532 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 533 sizeof(status)); 534 if (unlikely(in_len < sizeof(status))) { 535 error_report("Bad device CVQ written length"); 536 } 537 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 538 g_free(elem); 539 return dev_written < 0 ? dev_written : 0; 540 } 541 542 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 543 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 544 }; 545 546 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 547 const char *device, 548 const char *name, 549 int vdpa_device_fd, 550 int queue_pair_index, 551 int nvqs, 552 bool is_datapath, 553 bool svq, 554 struct vhost_vdpa_iova_range iova_range, 555 VhostIOVATree *iova_tree) 556 { 557 NetClientState *nc = NULL; 558 VhostVDPAState *s; 559 int ret = 0; 560 assert(name); 561 if (is_datapath) { 562 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 563 name); 564 } else { 565 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 566 device, name); 567 } 568 qemu_set_info_str(nc, TYPE_VHOST_VDPA); 569 s = DO_UPCAST(VhostVDPAState, nc, nc); 570 571 s->vhost_vdpa.device_fd = vdpa_device_fd; 572 s->vhost_vdpa.index = queue_pair_index; 573 s->always_svq = svq; 574 s->vhost_vdpa.shadow_vqs_enabled = svq; 575 s->vhost_vdpa.iova_range = iova_range; 576 s->vhost_vdpa.shadow_data = svq; 577 s->vhost_vdpa.iova_tree = iova_tree; 578 if (!is_datapath) { 579 s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(), 580 vhost_vdpa_net_cvq_cmd_page_len()); 581 memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); 582 s->status = qemu_memalign(qemu_real_host_page_size(), 583 vhost_vdpa_net_cvq_cmd_page_len()); 584 memset(s->status, 0, vhost_vdpa_net_cvq_cmd_page_len()); 585 586 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 587 s->vhost_vdpa.shadow_vq_ops_opaque = s; 588 } 589 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 590 if (ret) { 591 qemu_del_net_client(nc); 592 return NULL; 593 } 594 return nc; 595 } 596 597 static int vhost_vdpa_get_iova_range(int fd, 598 struct vhost_vdpa_iova_range *iova_range) 599 { 600 int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); 601 602 return ret < 0 ? -errno : 0; 603 } 604 605 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 606 { 607 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 608 if (unlikely(ret < 0)) { 609 error_setg_errno(errp, errno, 610 "Fail to query features from vhost-vDPA device"); 611 } 612 return ret; 613 } 614 615 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 616 int *has_cvq, Error **errp) 617 { 618 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 619 g_autofree struct vhost_vdpa_config *config = NULL; 620 __virtio16 *max_queue_pairs; 621 int ret; 622 623 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 624 *has_cvq = 1; 625 } else { 626 *has_cvq = 0; 627 } 628 629 if (features & (1 << VIRTIO_NET_F_MQ)) { 630 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 631 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 632 config->len = sizeof(*max_queue_pairs); 633 634 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 635 if (ret) { 636 error_setg(errp, "Fail to get config from vhost-vDPA device"); 637 return -ret; 638 } 639 640 max_queue_pairs = (__virtio16 *)&config->buf; 641 642 return lduw_le_p(max_queue_pairs); 643 } 644 645 return 1; 646 } 647 648 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 649 NetClientState *peer, Error **errp) 650 { 651 const NetdevVhostVDPAOptions *opts; 652 uint64_t features; 653 int vdpa_device_fd; 654 g_autofree NetClientState **ncs = NULL; 655 g_autoptr(VhostIOVATree) iova_tree = NULL; 656 struct vhost_vdpa_iova_range iova_range; 657 NetClientState *nc; 658 int queue_pairs, r, i = 0, has_cvq = 0; 659 660 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 661 opts = &netdev->u.vhost_vdpa; 662 if (!opts->vhostdev && !opts->vhostfd) { 663 error_setg(errp, 664 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); 665 return -1; 666 } 667 668 if (opts->vhostdev && opts->vhostfd) { 669 error_setg(errp, 670 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); 671 return -1; 672 } 673 674 if (opts->vhostdev) { 675 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 676 if (vdpa_device_fd == -1) { 677 return -errno; 678 } 679 } else { 680 /* has_vhostfd */ 681 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); 682 if (vdpa_device_fd == -1) { 683 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); 684 return -1; 685 } 686 } 687 688 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 689 if (unlikely(r < 0)) { 690 goto err; 691 } 692 693 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 694 &has_cvq, errp); 695 if (queue_pairs < 0) { 696 qemu_close(vdpa_device_fd); 697 return queue_pairs; 698 } 699 700 vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 701 if (opts->x_svq) { 702 if (!vhost_vdpa_net_valid_svq_features(features, errp)) { 703 goto err_svq; 704 } 705 706 iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); 707 } 708 709 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 710 711 for (i = 0; i < queue_pairs; i++) { 712 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 713 vdpa_device_fd, i, 2, true, opts->x_svq, 714 iova_range, iova_tree); 715 if (!ncs[i]) 716 goto err; 717 } 718 719 if (has_cvq) { 720 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 721 vdpa_device_fd, i, 1, false, 722 opts->x_svq, iova_range, iova_tree); 723 if (!nc) 724 goto err; 725 } 726 727 /* iova_tree ownership belongs to last NetClientState */ 728 g_steal_pointer(&iova_tree); 729 return 0; 730 731 err: 732 if (i) { 733 for (i--; i >= 0; i--) { 734 qemu_del_net_client(ncs[i]); 735 } 736 } 737 738 err_svq: 739 qemu_close(vdpa_device_fd); 740 741 return -1; 742 } 743