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