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