1 /* 2 * Virtio Network Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/iov.h" 16 #include "hw/virtio/virtio.h" 17 #include "net/net.h" 18 #include "net/checksum.h" 19 #include "net/tap.h" 20 #include "qemu/error-report.h" 21 #include "qemu/timer.h" 22 #include "hw/virtio/virtio-net.h" 23 #include "net/vhost_net.h" 24 #include "hw/virtio/virtio-bus.h" 25 #include "qapi/qmp/qjson.h" 26 #include "qapi-event.h" 27 #include "hw/virtio/virtio-access.h" 28 #include "migration/misc.h" 29 30 #define VIRTIO_NET_VM_VERSION 11 31 32 #define MAC_TABLE_ENTRIES 64 33 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 34 35 /* previously fixed value */ 36 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 37 /* for now, only allow larger queues; with virtio-1, guest can downsize */ 38 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 39 40 /* 41 * Calculate the number of bytes up to and including the given 'field' of 42 * 'container'. 43 */ 44 #define endof(container, field) \ 45 (offsetof(container, field) + sizeof(((container *)0)->field)) 46 47 typedef struct VirtIOFeature { 48 uint32_t flags; 49 size_t end; 50 } VirtIOFeature; 51 52 static VirtIOFeature feature_sizes[] = { 53 {.flags = 1 << VIRTIO_NET_F_MAC, 54 .end = endof(struct virtio_net_config, mac)}, 55 {.flags = 1 << VIRTIO_NET_F_STATUS, 56 .end = endof(struct virtio_net_config, status)}, 57 {.flags = 1 << VIRTIO_NET_F_MQ, 58 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 59 {.flags = 1 << VIRTIO_NET_F_MTU, 60 .end = endof(struct virtio_net_config, mtu)}, 61 {} 62 }; 63 64 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 65 { 66 VirtIONet *n = qemu_get_nic_opaque(nc); 67 68 return &n->vqs[nc->queue_index]; 69 } 70 71 static int vq2q(int queue_index) 72 { 73 return queue_index / 2; 74 } 75 76 /* TODO 77 * - we could suppress RX interrupt if we were so inclined. 78 */ 79 80 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 81 { 82 VirtIONet *n = VIRTIO_NET(vdev); 83 struct virtio_net_config netcfg; 84 85 virtio_stw_p(vdev, &netcfg.status, n->status); 86 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 87 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); 88 memcpy(netcfg.mac, n->mac, ETH_ALEN); 89 memcpy(config, &netcfg, n->config_size); 90 } 91 92 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 93 { 94 VirtIONet *n = VIRTIO_NET(vdev); 95 struct virtio_net_config netcfg = {}; 96 97 memcpy(&netcfg, config, n->config_size); 98 99 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 100 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 101 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 102 memcpy(n->mac, netcfg.mac, ETH_ALEN); 103 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 104 } 105 } 106 107 static bool virtio_net_started(VirtIONet *n, uint8_t status) 108 { 109 VirtIODevice *vdev = VIRTIO_DEVICE(n); 110 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 111 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 112 } 113 114 static void virtio_net_announce_timer(void *opaque) 115 { 116 VirtIONet *n = opaque; 117 VirtIODevice *vdev = VIRTIO_DEVICE(n); 118 119 n->announce_counter--; 120 n->status |= VIRTIO_NET_S_ANNOUNCE; 121 virtio_notify_config(vdev); 122 } 123 124 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 125 { 126 VirtIODevice *vdev = VIRTIO_DEVICE(n); 127 NetClientState *nc = qemu_get_queue(n->nic); 128 int queues = n->multiqueue ? n->max_queues : 1; 129 130 if (!get_vhost_net(nc->peer)) { 131 return; 132 } 133 134 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 135 !!n->vhost_started) { 136 return; 137 } 138 if (!n->vhost_started) { 139 int r, i; 140 141 if (n->needs_vnet_hdr_swap) { 142 error_report("backend does not support %s vnet headers; " 143 "falling back on userspace virtio", 144 virtio_is_big_endian(vdev) ? "BE" : "LE"); 145 return; 146 } 147 148 /* Any packets outstanding? Purge them to avoid touching rings 149 * when vhost is running. 150 */ 151 for (i = 0; i < queues; i++) { 152 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 153 154 /* Purge both directions: TX and RX. */ 155 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 156 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 157 } 158 159 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { 160 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); 161 if (r < 0) { 162 error_report("%uBytes MTU not supported by the backend", 163 n->net_conf.mtu); 164 165 return; 166 } 167 } 168 169 n->vhost_started = 1; 170 r = vhost_net_start(vdev, n->nic->ncs, queues); 171 if (r < 0) { 172 error_report("unable to start vhost net: %d: " 173 "falling back on userspace virtio", -r); 174 n->vhost_started = 0; 175 } 176 } else { 177 vhost_net_stop(vdev, n->nic->ncs, queues); 178 n->vhost_started = 0; 179 } 180 } 181 182 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 183 NetClientState *peer, 184 bool enable) 185 { 186 if (virtio_is_big_endian(vdev)) { 187 return qemu_set_vnet_be(peer, enable); 188 } else { 189 return qemu_set_vnet_le(peer, enable); 190 } 191 } 192 193 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 194 int queues, bool enable) 195 { 196 int i; 197 198 for (i = 0; i < queues; i++) { 199 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 200 enable) { 201 while (--i >= 0) { 202 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 203 } 204 205 return true; 206 } 207 } 208 209 return false; 210 } 211 212 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 213 { 214 VirtIODevice *vdev = VIRTIO_DEVICE(n); 215 int queues = n->multiqueue ? n->max_queues : 1; 216 217 if (virtio_net_started(n, status)) { 218 /* Before using the device, we tell the network backend about the 219 * endianness to use when parsing vnet headers. If the backend 220 * can't do it, we fallback onto fixing the headers in the core 221 * virtio-net code. 222 */ 223 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, 224 queues, true); 225 } else if (virtio_net_started(n, vdev->status)) { 226 /* After using the device, we need to reset the network backend to 227 * the default (guest native endianness), otherwise the guest may 228 * lose network connectivity if it is rebooted into a different 229 * endianness. 230 */ 231 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); 232 } 233 } 234 235 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) 236 { 237 unsigned int dropped = virtqueue_drop_all(vq); 238 if (dropped) { 239 virtio_notify(vdev, vq); 240 } 241 } 242 243 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 244 { 245 VirtIONet *n = VIRTIO_NET(vdev); 246 VirtIONetQueue *q; 247 int i; 248 uint8_t queue_status; 249 250 virtio_net_vnet_endian_status(n, status); 251 virtio_net_vhost_status(n, status); 252 253 for (i = 0; i < n->max_queues; i++) { 254 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 255 bool queue_started; 256 q = &n->vqs[i]; 257 258 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 259 queue_status = 0; 260 } else { 261 queue_status = status; 262 } 263 queue_started = 264 virtio_net_started(n, queue_status) && !n->vhost_started; 265 266 if (queue_started) { 267 qemu_flush_queued_packets(ncs); 268 } 269 270 if (!q->tx_waiting) { 271 continue; 272 } 273 274 if (queue_started) { 275 if (q->tx_timer) { 276 timer_mod(q->tx_timer, 277 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 278 } else { 279 qemu_bh_schedule(q->tx_bh); 280 } 281 } else { 282 if (q->tx_timer) { 283 timer_del(q->tx_timer); 284 } else { 285 qemu_bh_cancel(q->tx_bh); 286 } 287 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && 288 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK)) { 289 /* if tx is waiting we are likely have some packets in tx queue 290 * and disabled notification */ 291 q->tx_waiting = 0; 292 virtio_queue_set_notification(q->tx_vq, 1); 293 virtio_net_drop_tx_queue_data(vdev, q->tx_vq); 294 } 295 } 296 } 297 } 298 299 static void virtio_net_set_link_status(NetClientState *nc) 300 { 301 VirtIONet *n = qemu_get_nic_opaque(nc); 302 VirtIODevice *vdev = VIRTIO_DEVICE(n); 303 uint16_t old_status = n->status; 304 305 if (nc->link_down) 306 n->status &= ~VIRTIO_NET_S_LINK_UP; 307 else 308 n->status |= VIRTIO_NET_S_LINK_UP; 309 310 if (n->status != old_status) 311 virtio_notify_config(vdev); 312 313 virtio_net_set_status(vdev, vdev->status); 314 } 315 316 static void rxfilter_notify(NetClientState *nc) 317 { 318 VirtIONet *n = qemu_get_nic_opaque(nc); 319 320 if (nc->rxfilter_notify_enabled) { 321 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 322 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 323 n->netclient_name, path, &error_abort); 324 g_free(path); 325 326 /* disable event notification to avoid events flooding */ 327 nc->rxfilter_notify_enabled = 0; 328 } 329 } 330 331 static intList *get_vlan_table(VirtIONet *n) 332 { 333 intList *list, *entry; 334 int i, j; 335 336 list = NULL; 337 for (i = 0; i < MAX_VLAN >> 5; i++) { 338 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 339 if (n->vlans[i] & (1U << j)) { 340 entry = g_malloc0(sizeof(*entry)); 341 entry->value = (i << 5) + j; 342 entry->next = list; 343 list = entry; 344 } 345 } 346 } 347 348 return list; 349 } 350 351 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 352 { 353 VirtIONet *n = qemu_get_nic_opaque(nc); 354 VirtIODevice *vdev = VIRTIO_DEVICE(n); 355 RxFilterInfo *info; 356 strList *str_list, *entry; 357 int i; 358 359 info = g_malloc0(sizeof(*info)); 360 info->name = g_strdup(nc->name); 361 info->promiscuous = n->promisc; 362 363 if (n->nouni) { 364 info->unicast = RX_STATE_NONE; 365 } else if (n->alluni) { 366 info->unicast = RX_STATE_ALL; 367 } else { 368 info->unicast = RX_STATE_NORMAL; 369 } 370 371 if (n->nomulti) { 372 info->multicast = RX_STATE_NONE; 373 } else if (n->allmulti) { 374 info->multicast = RX_STATE_ALL; 375 } else { 376 info->multicast = RX_STATE_NORMAL; 377 } 378 379 info->broadcast_allowed = n->nobcast; 380 info->multicast_overflow = n->mac_table.multi_overflow; 381 info->unicast_overflow = n->mac_table.uni_overflow; 382 383 info->main_mac = qemu_mac_strdup_printf(n->mac); 384 385 str_list = NULL; 386 for (i = 0; i < n->mac_table.first_multi; i++) { 387 entry = g_malloc0(sizeof(*entry)); 388 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 389 entry->next = str_list; 390 str_list = entry; 391 } 392 info->unicast_table = str_list; 393 394 str_list = NULL; 395 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 396 entry = g_malloc0(sizeof(*entry)); 397 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 398 entry->next = str_list; 399 str_list = entry; 400 } 401 info->multicast_table = str_list; 402 info->vlan_table = get_vlan_table(n); 403 404 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 405 info->vlan = RX_STATE_ALL; 406 } else if (!info->vlan_table) { 407 info->vlan = RX_STATE_NONE; 408 } else { 409 info->vlan = RX_STATE_NORMAL; 410 } 411 412 /* enable event notification after query */ 413 nc->rxfilter_notify_enabled = 1; 414 415 return info; 416 } 417 418 static void virtio_net_reset(VirtIODevice *vdev) 419 { 420 VirtIONet *n = VIRTIO_NET(vdev); 421 422 /* Reset back to compatibility mode */ 423 n->promisc = 1; 424 n->allmulti = 0; 425 n->alluni = 0; 426 n->nomulti = 0; 427 n->nouni = 0; 428 n->nobcast = 0; 429 /* multiqueue is disabled by default */ 430 n->curr_queues = 1; 431 timer_del(n->announce_timer); 432 n->announce_counter = 0; 433 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 434 435 /* Flush any MAC and VLAN filter table state */ 436 n->mac_table.in_use = 0; 437 n->mac_table.first_multi = 0; 438 n->mac_table.multi_overflow = 0; 439 n->mac_table.uni_overflow = 0; 440 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 441 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 442 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 443 memset(n->vlans, 0, MAX_VLAN >> 3); 444 } 445 446 static void peer_test_vnet_hdr(VirtIONet *n) 447 { 448 NetClientState *nc = qemu_get_queue(n->nic); 449 if (!nc->peer) { 450 return; 451 } 452 453 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 454 } 455 456 static int peer_has_vnet_hdr(VirtIONet *n) 457 { 458 return n->has_vnet_hdr; 459 } 460 461 static int peer_has_ufo(VirtIONet *n) 462 { 463 if (!peer_has_vnet_hdr(n)) 464 return 0; 465 466 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 467 468 return n->has_ufo; 469 } 470 471 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 472 int version_1) 473 { 474 int i; 475 NetClientState *nc; 476 477 n->mergeable_rx_bufs = mergeable_rx_bufs; 478 479 if (version_1) { 480 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 481 } else { 482 n->guest_hdr_len = n->mergeable_rx_bufs ? 483 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 484 sizeof(struct virtio_net_hdr); 485 } 486 487 for (i = 0; i < n->max_queues; i++) { 488 nc = qemu_get_subqueue(n->nic, i); 489 490 if (peer_has_vnet_hdr(n) && 491 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 492 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 493 n->host_hdr_len = n->guest_hdr_len; 494 } 495 } 496 } 497 498 static int peer_attach(VirtIONet *n, int index) 499 { 500 NetClientState *nc = qemu_get_subqueue(n->nic, index); 501 502 if (!nc->peer) { 503 return 0; 504 } 505 506 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 507 vhost_set_vring_enable(nc->peer, 1); 508 } 509 510 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 511 return 0; 512 } 513 514 if (n->max_queues == 1) { 515 return 0; 516 } 517 518 return tap_enable(nc->peer); 519 } 520 521 static int peer_detach(VirtIONet *n, int index) 522 { 523 NetClientState *nc = qemu_get_subqueue(n->nic, index); 524 525 if (!nc->peer) { 526 return 0; 527 } 528 529 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 530 vhost_set_vring_enable(nc->peer, 0); 531 } 532 533 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 534 return 0; 535 } 536 537 return tap_disable(nc->peer); 538 } 539 540 static void virtio_net_set_queues(VirtIONet *n) 541 { 542 int i; 543 int r; 544 545 if (n->nic->peer_deleted) { 546 return; 547 } 548 549 for (i = 0; i < n->max_queues; i++) { 550 if (i < n->curr_queues) { 551 r = peer_attach(n, i); 552 assert(!r); 553 } else { 554 r = peer_detach(n, i); 555 assert(!r); 556 } 557 } 558 } 559 560 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 561 562 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 563 Error **errp) 564 { 565 VirtIONet *n = VIRTIO_NET(vdev); 566 NetClientState *nc = qemu_get_queue(n->nic); 567 568 /* Firstly sync all virtio-net possible supported features */ 569 features |= n->host_features; 570 571 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 572 573 if (!peer_has_vnet_hdr(n)) { 574 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 575 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 576 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 577 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 578 579 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 580 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 581 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 582 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 583 } 584 585 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 586 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 587 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 588 } 589 590 if (!get_vhost_net(nc->peer)) { 591 return features; 592 } 593 features = vhost_net_get_features(get_vhost_net(nc->peer), features); 594 vdev->backend_features = features; 595 596 if (n->mtu_bypass_backend && 597 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { 598 features |= (1ULL << VIRTIO_NET_F_MTU); 599 } 600 601 return features; 602 } 603 604 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 605 { 606 uint64_t features = 0; 607 608 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 609 * but also these: */ 610 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 611 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 612 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 613 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 614 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 615 616 return features; 617 } 618 619 static void virtio_net_apply_guest_offloads(VirtIONet *n) 620 { 621 qemu_set_offload(qemu_get_queue(n->nic)->peer, 622 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 623 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 624 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 625 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 626 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 627 } 628 629 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 630 { 631 static const uint64_t guest_offloads_mask = 632 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 633 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 634 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 635 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 636 (1ULL << VIRTIO_NET_F_GUEST_UFO); 637 638 return guest_offloads_mask & features; 639 } 640 641 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 642 { 643 VirtIODevice *vdev = VIRTIO_DEVICE(n); 644 return virtio_net_guest_offloads_by_features(vdev->guest_features); 645 } 646 647 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 648 { 649 VirtIONet *n = VIRTIO_NET(vdev); 650 int i; 651 652 if (n->mtu_bypass_backend && 653 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { 654 features &= ~(1ULL << VIRTIO_NET_F_MTU); 655 } 656 657 virtio_net_set_multiqueue(n, 658 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 659 660 virtio_net_set_mrg_rx_bufs(n, 661 virtio_has_feature(features, 662 VIRTIO_NET_F_MRG_RXBUF), 663 virtio_has_feature(features, 664 VIRTIO_F_VERSION_1)); 665 666 if (n->has_vnet_hdr) { 667 n->curr_guest_offloads = 668 virtio_net_guest_offloads_by_features(features); 669 virtio_net_apply_guest_offloads(n); 670 } 671 672 for (i = 0; i < n->max_queues; i++) { 673 NetClientState *nc = qemu_get_subqueue(n->nic, i); 674 675 if (!get_vhost_net(nc->peer)) { 676 continue; 677 } 678 vhost_net_ack_features(get_vhost_net(nc->peer), features); 679 } 680 681 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 682 memset(n->vlans, 0, MAX_VLAN >> 3); 683 } else { 684 memset(n->vlans, 0xff, MAX_VLAN >> 3); 685 } 686 } 687 688 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 689 struct iovec *iov, unsigned int iov_cnt) 690 { 691 uint8_t on; 692 size_t s; 693 NetClientState *nc = qemu_get_queue(n->nic); 694 695 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 696 if (s != sizeof(on)) { 697 return VIRTIO_NET_ERR; 698 } 699 700 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 701 n->promisc = on; 702 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 703 n->allmulti = on; 704 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 705 n->alluni = on; 706 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 707 n->nomulti = on; 708 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 709 n->nouni = on; 710 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 711 n->nobcast = on; 712 } else { 713 return VIRTIO_NET_ERR; 714 } 715 716 rxfilter_notify(nc); 717 718 return VIRTIO_NET_OK; 719 } 720 721 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 722 struct iovec *iov, unsigned int iov_cnt) 723 { 724 VirtIODevice *vdev = VIRTIO_DEVICE(n); 725 uint64_t offloads; 726 size_t s; 727 728 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 729 return VIRTIO_NET_ERR; 730 } 731 732 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 733 if (s != sizeof(offloads)) { 734 return VIRTIO_NET_ERR; 735 } 736 737 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 738 uint64_t supported_offloads; 739 740 if (!n->has_vnet_hdr) { 741 return VIRTIO_NET_ERR; 742 } 743 744 supported_offloads = virtio_net_supported_guest_offloads(n); 745 if (offloads & ~supported_offloads) { 746 return VIRTIO_NET_ERR; 747 } 748 749 n->curr_guest_offloads = offloads; 750 virtio_net_apply_guest_offloads(n); 751 752 return VIRTIO_NET_OK; 753 } else { 754 return VIRTIO_NET_ERR; 755 } 756 } 757 758 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 759 struct iovec *iov, unsigned int iov_cnt) 760 { 761 VirtIODevice *vdev = VIRTIO_DEVICE(n); 762 struct virtio_net_ctrl_mac mac_data; 763 size_t s; 764 NetClientState *nc = qemu_get_queue(n->nic); 765 766 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 767 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 768 return VIRTIO_NET_ERR; 769 } 770 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 771 assert(s == sizeof(n->mac)); 772 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 773 rxfilter_notify(nc); 774 775 return VIRTIO_NET_OK; 776 } 777 778 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 779 return VIRTIO_NET_ERR; 780 } 781 782 int in_use = 0; 783 int first_multi = 0; 784 uint8_t uni_overflow = 0; 785 uint8_t multi_overflow = 0; 786 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 787 788 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 789 sizeof(mac_data.entries)); 790 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 791 if (s != sizeof(mac_data.entries)) { 792 goto error; 793 } 794 iov_discard_front(&iov, &iov_cnt, s); 795 796 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 797 goto error; 798 } 799 800 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 801 s = iov_to_buf(iov, iov_cnt, 0, macs, 802 mac_data.entries * ETH_ALEN); 803 if (s != mac_data.entries * ETH_ALEN) { 804 goto error; 805 } 806 in_use += mac_data.entries; 807 } else { 808 uni_overflow = 1; 809 } 810 811 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 812 813 first_multi = in_use; 814 815 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 816 sizeof(mac_data.entries)); 817 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 818 if (s != sizeof(mac_data.entries)) { 819 goto error; 820 } 821 822 iov_discard_front(&iov, &iov_cnt, s); 823 824 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 825 goto error; 826 } 827 828 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 829 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 830 mac_data.entries * ETH_ALEN); 831 if (s != mac_data.entries * ETH_ALEN) { 832 goto error; 833 } 834 in_use += mac_data.entries; 835 } else { 836 multi_overflow = 1; 837 } 838 839 n->mac_table.in_use = in_use; 840 n->mac_table.first_multi = first_multi; 841 n->mac_table.uni_overflow = uni_overflow; 842 n->mac_table.multi_overflow = multi_overflow; 843 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 844 g_free(macs); 845 rxfilter_notify(nc); 846 847 return VIRTIO_NET_OK; 848 849 error: 850 g_free(macs); 851 return VIRTIO_NET_ERR; 852 } 853 854 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 855 struct iovec *iov, unsigned int iov_cnt) 856 { 857 VirtIODevice *vdev = VIRTIO_DEVICE(n); 858 uint16_t vid; 859 size_t s; 860 NetClientState *nc = qemu_get_queue(n->nic); 861 862 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 863 vid = virtio_lduw_p(vdev, &vid); 864 if (s != sizeof(vid)) { 865 return VIRTIO_NET_ERR; 866 } 867 868 if (vid >= MAX_VLAN) 869 return VIRTIO_NET_ERR; 870 871 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 872 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 873 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 874 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 875 else 876 return VIRTIO_NET_ERR; 877 878 rxfilter_notify(nc); 879 880 return VIRTIO_NET_OK; 881 } 882 883 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 884 struct iovec *iov, unsigned int iov_cnt) 885 { 886 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 887 n->status & VIRTIO_NET_S_ANNOUNCE) { 888 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 889 if (n->announce_counter) { 890 timer_mod(n->announce_timer, 891 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 892 self_announce_delay(n->announce_counter)); 893 } 894 return VIRTIO_NET_OK; 895 } else { 896 return VIRTIO_NET_ERR; 897 } 898 } 899 900 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 901 struct iovec *iov, unsigned int iov_cnt) 902 { 903 VirtIODevice *vdev = VIRTIO_DEVICE(n); 904 struct virtio_net_ctrl_mq mq; 905 size_t s; 906 uint16_t queues; 907 908 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 909 if (s != sizeof(mq)) { 910 return VIRTIO_NET_ERR; 911 } 912 913 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 914 return VIRTIO_NET_ERR; 915 } 916 917 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 918 919 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 920 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 921 queues > n->max_queues || 922 !n->multiqueue) { 923 return VIRTIO_NET_ERR; 924 } 925 926 n->curr_queues = queues; 927 /* stop the backend before changing the number of queues to avoid handling a 928 * disabled queue */ 929 virtio_net_set_status(vdev, vdev->status); 930 virtio_net_set_queues(n); 931 932 return VIRTIO_NET_OK; 933 } 934 935 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 936 { 937 VirtIONet *n = VIRTIO_NET(vdev); 938 struct virtio_net_ctrl_hdr ctrl; 939 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 940 VirtQueueElement *elem; 941 size_t s; 942 struct iovec *iov, *iov2; 943 unsigned int iov_cnt; 944 945 for (;;) { 946 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 947 if (!elem) { 948 break; 949 } 950 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || 951 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { 952 virtio_error(vdev, "virtio-net ctrl missing headers"); 953 virtqueue_detach_element(vq, elem, 0); 954 g_free(elem); 955 break; 956 } 957 958 iov_cnt = elem->out_num; 959 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); 960 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 961 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 962 if (s != sizeof(ctrl)) { 963 status = VIRTIO_NET_ERR; 964 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 965 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 966 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 967 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 968 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 969 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 970 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 971 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 972 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 973 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 974 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 975 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 976 } 977 978 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); 979 assert(s == sizeof(status)); 980 981 virtqueue_push(vq, elem, sizeof(status)); 982 virtio_notify(vdev, vq); 983 g_free(iov2); 984 g_free(elem); 985 } 986 } 987 988 /* RX */ 989 990 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 991 { 992 VirtIONet *n = VIRTIO_NET(vdev); 993 int queue_index = vq2q(virtio_get_queue_index(vq)); 994 995 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 996 } 997 998 static int virtio_net_can_receive(NetClientState *nc) 999 { 1000 VirtIONet *n = qemu_get_nic_opaque(nc); 1001 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1002 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1003 1004 if (!vdev->vm_running) { 1005 return 0; 1006 } 1007 1008 if (nc->queue_index >= n->curr_queues) { 1009 return 0; 1010 } 1011 1012 if (!virtio_queue_ready(q->rx_vq) || 1013 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1014 return 0; 1015 } 1016 1017 return 1; 1018 } 1019 1020 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1021 { 1022 VirtIONet *n = q->n; 1023 if (virtio_queue_empty(q->rx_vq) || 1024 (n->mergeable_rx_bufs && 1025 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1026 virtio_queue_set_notification(q->rx_vq, 1); 1027 1028 /* To avoid a race condition where the guest has made some buffers 1029 * available after the above check but before notification was 1030 * enabled, check for available buffers again. 1031 */ 1032 if (virtio_queue_empty(q->rx_vq) || 1033 (n->mergeable_rx_bufs && 1034 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1035 return 0; 1036 } 1037 } 1038 1039 virtio_queue_set_notification(q->rx_vq, 0); 1040 return 1; 1041 } 1042 1043 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1044 { 1045 virtio_tswap16s(vdev, &hdr->hdr_len); 1046 virtio_tswap16s(vdev, &hdr->gso_size); 1047 virtio_tswap16s(vdev, &hdr->csum_start); 1048 virtio_tswap16s(vdev, &hdr->csum_offset); 1049 } 1050 1051 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1052 * it never finds out that the packets don't have valid checksums. This 1053 * causes dhclient to get upset. Fedora's carried a patch for ages to 1054 * fix this with Xen but it hasn't appeared in an upstream release of 1055 * dhclient yet. 1056 * 1057 * To avoid breaking existing guests, we catch udp packets and add 1058 * checksums. This is terrible but it's better than hacking the guest 1059 * kernels. 1060 * 1061 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1062 * we should provide a mechanism to disable it to avoid polluting the host 1063 * cache. 1064 */ 1065 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1066 uint8_t *buf, size_t size) 1067 { 1068 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1069 (size > 27 && size < 1500) && /* normal sized MTU */ 1070 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1071 (buf[23] == 17) && /* ip.protocol == UDP */ 1072 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1073 net_checksum_calculate(buf, size); 1074 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1075 } 1076 } 1077 1078 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1079 const void *buf, size_t size) 1080 { 1081 if (n->has_vnet_hdr) { 1082 /* FIXME this cast is evil */ 1083 void *wbuf = (void *)buf; 1084 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1085 size - n->host_hdr_len); 1086 1087 if (n->needs_vnet_hdr_swap) { 1088 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1089 } 1090 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1091 } else { 1092 struct virtio_net_hdr hdr = { 1093 .flags = 0, 1094 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1095 }; 1096 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1097 } 1098 } 1099 1100 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1101 { 1102 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1103 static const uint8_t vlan[] = {0x81, 0x00}; 1104 uint8_t *ptr = (uint8_t *)buf; 1105 int i; 1106 1107 if (n->promisc) 1108 return 1; 1109 1110 ptr += n->host_hdr_len; 1111 1112 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1113 int vid = lduw_be_p(ptr + 14) & 0xfff; 1114 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1115 return 0; 1116 } 1117 1118 if (ptr[0] & 1) { // multicast 1119 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1120 return !n->nobcast; 1121 } else if (n->nomulti) { 1122 return 0; 1123 } else if (n->allmulti || n->mac_table.multi_overflow) { 1124 return 1; 1125 } 1126 1127 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1128 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1129 return 1; 1130 } 1131 } 1132 } else { // unicast 1133 if (n->nouni) { 1134 return 0; 1135 } else if (n->alluni || n->mac_table.uni_overflow) { 1136 return 1; 1137 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1138 return 1; 1139 } 1140 1141 for (i = 0; i < n->mac_table.first_multi; i++) { 1142 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1143 return 1; 1144 } 1145 } 1146 } 1147 1148 return 0; 1149 } 1150 1151 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1152 size_t size) 1153 { 1154 VirtIONet *n = qemu_get_nic_opaque(nc); 1155 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1156 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1157 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1158 struct virtio_net_hdr_mrg_rxbuf mhdr; 1159 unsigned mhdr_cnt = 0; 1160 size_t offset, i, guest_offset; 1161 1162 if (!virtio_net_can_receive(nc)) { 1163 return -1; 1164 } 1165 1166 /* hdr_len refers to the header we supply to the guest */ 1167 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1168 return 0; 1169 } 1170 1171 if (!receive_filter(n, buf, size)) 1172 return size; 1173 1174 offset = i = 0; 1175 1176 while (offset < size) { 1177 VirtQueueElement *elem; 1178 int len, total; 1179 const struct iovec *sg; 1180 1181 total = 0; 1182 1183 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1184 if (!elem) { 1185 if (i) { 1186 virtio_error(vdev, "virtio-net unexpected empty queue: " 1187 "i %zd mergeable %d offset %zd, size %zd, " 1188 "guest hdr len %zd, host hdr len %zd " 1189 "guest features 0x%" PRIx64, 1190 i, n->mergeable_rx_bufs, offset, size, 1191 n->guest_hdr_len, n->host_hdr_len, 1192 vdev->guest_features); 1193 } 1194 return -1; 1195 } 1196 1197 if (elem->in_num < 1) { 1198 virtio_error(vdev, 1199 "virtio-net receive queue contains no in buffers"); 1200 virtqueue_detach_element(q->rx_vq, elem, 0); 1201 g_free(elem); 1202 return -1; 1203 } 1204 1205 sg = elem->in_sg; 1206 if (i == 0) { 1207 assert(offset == 0); 1208 if (n->mergeable_rx_bufs) { 1209 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1210 sg, elem->in_num, 1211 offsetof(typeof(mhdr), num_buffers), 1212 sizeof(mhdr.num_buffers)); 1213 } 1214 1215 receive_header(n, sg, elem->in_num, buf, size); 1216 offset = n->host_hdr_len; 1217 total += n->guest_hdr_len; 1218 guest_offset = n->guest_hdr_len; 1219 } else { 1220 guest_offset = 0; 1221 } 1222 1223 /* copy in packet. ugh */ 1224 len = iov_from_buf(sg, elem->in_num, guest_offset, 1225 buf + offset, size - offset); 1226 total += len; 1227 offset += len; 1228 /* If buffers can't be merged, at this point we 1229 * must have consumed the complete packet. 1230 * Otherwise, drop it. */ 1231 if (!n->mergeable_rx_bufs && offset < size) { 1232 virtqueue_unpop(q->rx_vq, elem, total); 1233 g_free(elem); 1234 return size; 1235 } 1236 1237 /* signal other side */ 1238 virtqueue_fill(q->rx_vq, elem, total, i++); 1239 g_free(elem); 1240 } 1241 1242 if (mhdr_cnt) { 1243 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1244 iov_from_buf(mhdr_sg, mhdr_cnt, 1245 0, 1246 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1247 } 1248 1249 virtqueue_flush(q->rx_vq, i); 1250 virtio_notify(vdev, q->rx_vq); 1251 1252 return size; 1253 } 1254 1255 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 1256 size_t size) 1257 { 1258 ssize_t r; 1259 1260 rcu_read_lock(); 1261 r = virtio_net_receive_rcu(nc, buf, size); 1262 rcu_read_unlock(); 1263 return r; 1264 } 1265 1266 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1267 1268 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1269 { 1270 VirtIONet *n = qemu_get_nic_opaque(nc); 1271 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1272 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1273 1274 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 1275 virtio_notify(vdev, q->tx_vq); 1276 1277 g_free(q->async_tx.elem); 1278 q->async_tx.elem = NULL; 1279 1280 virtio_queue_set_notification(q->tx_vq, 1); 1281 virtio_net_flush_tx(q); 1282 } 1283 1284 /* TX */ 1285 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1286 { 1287 VirtIONet *n = q->n; 1288 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1289 VirtQueueElement *elem; 1290 int32_t num_packets = 0; 1291 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1292 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1293 return num_packets; 1294 } 1295 1296 if (q->async_tx.elem) { 1297 virtio_queue_set_notification(q->tx_vq, 0); 1298 return num_packets; 1299 } 1300 1301 for (;;) { 1302 ssize_t ret; 1303 unsigned int out_num; 1304 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 1305 struct virtio_net_hdr_mrg_rxbuf mhdr; 1306 1307 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 1308 if (!elem) { 1309 break; 1310 } 1311 1312 out_num = elem->out_num; 1313 out_sg = elem->out_sg; 1314 if (out_num < 1) { 1315 virtio_error(vdev, "virtio-net header not in first element"); 1316 virtqueue_detach_element(q->tx_vq, elem, 0); 1317 g_free(elem); 1318 return -EINVAL; 1319 } 1320 1321 if (n->has_vnet_hdr) { 1322 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < 1323 n->guest_hdr_len) { 1324 virtio_error(vdev, "virtio-net header incorrect"); 1325 virtqueue_detach_element(q->tx_vq, elem, 0); 1326 g_free(elem); 1327 return -EINVAL; 1328 } 1329 if (n->needs_vnet_hdr_swap) { 1330 virtio_net_hdr_swap(vdev, (void *) &mhdr); 1331 sg2[0].iov_base = &mhdr; 1332 sg2[0].iov_len = n->guest_hdr_len; 1333 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, 1334 out_sg, out_num, 1335 n->guest_hdr_len, -1); 1336 if (out_num == VIRTQUEUE_MAX_SIZE) { 1337 goto drop; 1338 } 1339 out_num += 1; 1340 out_sg = sg2; 1341 } 1342 } 1343 /* 1344 * If host wants to see the guest header as is, we can 1345 * pass it on unchanged. Otherwise, copy just the parts 1346 * that host is interested in. 1347 */ 1348 assert(n->host_hdr_len <= n->guest_hdr_len); 1349 if (n->host_hdr_len != n->guest_hdr_len) { 1350 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1351 out_sg, out_num, 1352 0, n->host_hdr_len); 1353 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1354 out_sg, out_num, 1355 n->guest_hdr_len, -1); 1356 out_num = sg_num; 1357 out_sg = sg; 1358 } 1359 1360 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1361 out_sg, out_num, virtio_net_tx_complete); 1362 if (ret == 0) { 1363 virtio_queue_set_notification(q->tx_vq, 0); 1364 q->async_tx.elem = elem; 1365 return -EBUSY; 1366 } 1367 1368 drop: 1369 virtqueue_push(q->tx_vq, elem, 0); 1370 virtio_notify(vdev, q->tx_vq); 1371 g_free(elem); 1372 1373 if (++num_packets >= n->tx_burst) { 1374 break; 1375 } 1376 } 1377 return num_packets; 1378 } 1379 1380 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1381 { 1382 VirtIONet *n = VIRTIO_NET(vdev); 1383 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1384 1385 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1386 virtio_net_drop_tx_queue_data(vdev, vq); 1387 return; 1388 } 1389 1390 /* This happens when device was stopped but VCPU wasn't. */ 1391 if (!vdev->vm_running) { 1392 q->tx_waiting = 1; 1393 return; 1394 } 1395 1396 if (q->tx_waiting) { 1397 virtio_queue_set_notification(vq, 1); 1398 timer_del(q->tx_timer); 1399 q->tx_waiting = 0; 1400 if (virtio_net_flush_tx(q) == -EINVAL) { 1401 return; 1402 } 1403 } else { 1404 timer_mod(q->tx_timer, 1405 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1406 q->tx_waiting = 1; 1407 virtio_queue_set_notification(vq, 0); 1408 } 1409 } 1410 1411 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1412 { 1413 VirtIONet *n = VIRTIO_NET(vdev); 1414 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1415 1416 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1417 virtio_net_drop_tx_queue_data(vdev, vq); 1418 return; 1419 } 1420 1421 if (unlikely(q->tx_waiting)) { 1422 return; 1423 } 1424 q->tx_waiting = 1; 1425 /* This happens when device was stopped but VCPU wasn't. */ 1426 if (!vdev->vm_running) { 1427 return; 1428 } 1429 virtio_queue_set_notification(vq, 0); 1430 qemu_bh_schedule(q->tx_bh); 1431 } 1432 1433 static void virtio_net_tx_timer(void *opaque) 1434 { 1435 VirtIONetQueue *q = opaque; 1436 VirtIONet *n = q->n; 1437 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1438 /* This happens when device was stopped but BH wasn't. */ 1439 if (!vdev->vm_running) { 1440 /* Make sure tx waiting is set, so we'll run when restarted. */ 1441 assert(q->tx_waiting); 1442 return; 1443 } 1444 1445 q->tx_waiting = 0; 1446 1447 /* Just in case the driver is not ready on more */ 1448 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1449 return; 1450 } 1451 1452 virtio_queue_set_notification(q->tx_vq, 1); 1453 virtio_net_flush_tx(q); 1454 } 1455 1456 static void virtio_net_tx_bh(void *opaque) 1457 { 1458 VirtIONetQueue *q = opaque; 1459 VirtIONet *n = q->n; 1460 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1461 int32_t ret; 1462 1463 /* This happens when device was stopped but BH wasn't. */ 1464 if (!vdev->vm_running) { 1465 /* Make sure tx waiting is set, so we'll run when restarted. */ 1466 assert(q->tx_waiting); 1467 return; 1468 } 1469 1470 q->tx_waiting = 0; 1471 1472 /* Just in case the driver is not ready on more */ 1473 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1474 return; 1475 } 1476 1477 ret = virtio_net_flush_tx(q); 1478 if (ret == -EBUSY || ret == -EINVAL) { 1479 return; /* Notification re-enable handled by tx_complete or device 1480 * broken */ 1481 } 1482 1483 /* If we flush a full burst of packets, assume there are 1484 * more coming and immediately reschedule */ 1485 if (ret >= n->tx_burst) { 1486 qemu_bh_schedule(q->tx_bh); 1487 q->tx_waiting = 1; 1488 return; 1489 } 1490 1491 /* If less than a full burst, re-enable notification and flush 1492 * anything that may have come in while we weren't looking. If 1493 * we find something, assume the guest is still active and reschedule */ 1494 virtio_queue_set_notification(q->tx_vq, 1); 1495 ret = virtio_net_flush_tx(q); 1496 if (ret == -EINVAL) { 1497 return; 1498 } else if (ret > 0) { 1499 virtio_queue_set_notification(q->tx_vq, 0); 1500 qemu_bh_schedule(q->tx_bh); 1501 q->tx_waiting = 1; 1502 } 1503 } 1504 1505 static void virtio_net_add_queue(VirtIONet *n, int index) 1506 { 1507 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1508 1509 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 1510 virtio_net_handle_rx); 1511 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1512 n->vqs[index].tx_vq = 1513 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1514 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1515 virtio_net_tx_timer, 1516 &n->vqs[index]); 1517 } else { 1518 n->vqs[index].tx_vq = 1519 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1520 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); 1521 } 1522 1523 n->vqs[index].tx_waiting = 0; 1524 n->vqs[index].n = n; 1525 } 1526 1527 static void virtio_net_del_queue(VirtIONet *n, int index) 1528 { 1529 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1530 VirtIONetQueue *q = &n->vqs[index]; 1531 NetClientState *nc = qemu_get_subqueue(n->nic, index); 1532 1533 qemu_purge_queued_packets(nc); 1534 1535 virtio_del_queue(vdev, index * 2); 1536 if (q->tx_timer) { 1537 timer_del(q->tx_timer); 1538 timer_free(q->tx_timer); 1539 q->tx_timer = NULL; 1540 } else { 1541 qemu_bh_delete(q->tx_bh); 1542 q->tx_bh = NULL; 1543 } 1544 q->tx_waiting = 0; 1545 virtio_del_queue(vdev, index * 2 + 1); 1546 } 1547 1548 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) 1549 { 1550 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1551 int old_num_queues = virtio_get_num_queues(vdev); 1552 int new_num_queues = new_max_queues * 2 + 1; 1553 int i; 1554 1555 assert(old_num_queues >= 3); 1556 assert(old_num_queues % 2 == 1); 1557 1558 if (old_num_queues == new_num_queues) { 1559 return; 1560 } 1561 1562 /* 1563 * We always need to remove and add ctrl vq if 1564 * old_num_queues != new_num_queues. Remove ctrl_vq first, 1565 * and then we only enter one of the following too loops. 1566 */ 1567 virtio_del_queue(vdev, old_num_queues - 1); 1568 1569 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 1570 /* new_num_queues < old_num_queues */ 1571 virtio_net_del_queue(n, i / 2); 1572 } 1573 1574 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 1575 /* new_num_queues > old_num_queues */ 1576 virtio_net_add_queue(n, i / 2); 1577 } 1578 1579 /* add ctrl_vq last */ 1580 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1581 } 1582 1583 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1584 { 1585 int max = multiqueue ? n->max_queues : 1; 1586 1587 n->multiqueue = multiqueue; 1588 virtio_net_change_num_queues(n, max); 1589 1590 virtio_net_set_queues(n); 1591 } 1592 1593 static int virtio_net_post_load_device(void *opaque, int version_id) 1594 { 1595 VirtIONet *n = opaque; 1596 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1597 int i, link_down; 1598 1599 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 1600 virtio_vdev_has_feature(vdev, 1601 VIRTIO_F_VERSION_1)); 1602 1603 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1604 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 1605 n->mac_table.in_use = 0; 1606 } 1607 1608 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1609 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1610 } 1611 1612 if (peer_has_vnet_hdr(n)) { 1613 virtio_net_apply_guest_offloads(n); 1614 } 1615 1616 virtio_net_set_queues(n); 1617 1618 /* Find the first multicast entry in the saved MAC filter */ 1619 for (i = 0; i < n->mac_table.in_use; i++) { 1620 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1621 break; 1622 } 1623 } 1624 n->mac_table.first_multi = i; 1625 1626 /* nc.link_down can't be migrated, so infer link_down according 1627 * to link status bit in n->status */ 1628 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1629 for (i = 0; i < n->max_queues; i++) { 1630 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1631 } 1632 1633 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1634 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1635 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1636 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1637 } 1638 1639 return 0; 1640 } 1641 1642 /* tx_waiting field of a VirtIONetQueue */ 1643 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 1644 .name = "virtio-net-queue-tx_waiting", 1645 .fields = (VMStateField[]) { 1646 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 1647 VMSTATE_END_OF_LIST() 1648 }, 1649 }; 1650 1651 static bool max_queues_gt_1(void *opaque, int version_id) 1652 { 1653 return VIRTIO_NET(opaque)->max_queues > 1; 1654 } 1655 1656 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 1657 { 1658 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 1659 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 1660 } 1661 1662 static bool mac_table_fits(void *opaque, int version_id) 1663 { 1664 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 1665 } 1666 1667 static bool mac_table_doesnt_fit(void *opaque, int version_id) 1668 { 1669 return !mac_table_fits(opaque, version_id); 1670 } 1671 1672 /* This temporary type is shared by all the WITH_TMP methods 1673 * although only some fields are used by each. 1674 */ 1675 struct VirtIONetMigTmp { 1676 VirtIONet *parent; 1677 VirtIONetQueue *vqs_1; 1678 uint16_t curr_queues_1; 1679 uint8_t has_ufo; 1680 uint32_t has_vnet_hdr; 1681 }; 1682 1683 /* The 2nd and subsequent tx_waiting flags are loaded later than 1684 * the 1st entry in the queues and only if there's more than one 1685 * entry. We use the tmp mechanism to calculate a temporary 1686 * pointer and count and also validate the count. 1687 */ 1688 1689 static void virtio_net_tx_waiting_pre_save(void *opaque) 1690 { 1691 struct VirtIONetMigTmp *tmp = opaque; 1692 1693 tmp->vqs_1 = tmp->parent->vqs + 1; 1694 tmp->curr_queues_1 = tmp->parent->curr_queues - 1; 1695 if (tmp->parent->curr_queues == 0) { 1696 tmp->curr_queues_1 = 0; 1697 } 1698 } 1699 1700 static int virtio_net_tx_waiting_pre_load(void *opaque) 1701 { 1702 struct VirtIONetMigTmp *tmp = opaque; 1703 1704 /* Reuse the pointer setup from save */ 1705 virtio_net_tx_waiting_pre_save(opaque); 1706 1707 if (tmp->parent->curr_queues > tmp->parent->max_queues) { 1708 error_report("virtio-net: curr_queues %x > max_queues %x", 1709 tmp->parent->curr_queues, tmp->parent->max_queues); 1710 1711 return -EINVAL; 1712 } 1713 1714 return 0; /* all good */ 1715 } 1716 1717 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 1718 .name = "virtio-net-tx_waiting", 1719 .pre_load = virtio_net_tx_waiting_pre_load, 1720 .pre_save = virtio_net_tx_waiting_pre_save, 1721 .fields = (VMStateField[]) { 1722 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 1723 curr_queues_1, 1724 vmstate_virtio_net_queue_tx_waiting, 1725 struct VirtIONetQueue), 1726 VMSTATE_END_OF_LIST() 1727 }, 1728 }; 1729 1730 /* the 'has_ufo' flag is just tested; if the incoming stream has the 1731 * flag set we need to check that we have it 1732 */ 1733 static int virtio_net_ufo_post_load(void *opaque, int version_id) 1734 { 1735 struct VirtIONetMigTmp *tmp = opaque; 1736 1737 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 1738 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1739 return -EINVAL; 1740 } 1741 1742 return 0; 1743 } 1744 1745 static void virtio_net_ufo_pre_save(void *opaque) 1746 { 1747 struct VirtIONetMigTmp *tmp = opaque; 1748 1749 tmp->has_ufo = tmp->parent->has_ufo; 1750 } 1751 1752 static const VMStateDescription vmstate_virtio_net_has_ufo = { 1753 .name = "virtio-net-ufo", 1754 .post_load = virtio_net_ufo_post_load, 1755 .pre_save = virtio_net_ufo_pre_save, 1756 .fields = (VMStateField[]) { 1757 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 1758 VMSTATE_END_OF_LIST() 1759 }, 1760 }; 1761 1762 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 1763 * flag set we need to check that we have it 1764 */ 1765 static int virtio_net_vnet_post_load(void *opaque, int version_id) 1766 { 1767 struct VirtIONetMigTmp *tmp = opaque; 1768 1769 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 1770 error_report("virtio-net: saved image requires vnet_hdr=on"); 1771 return -EINVAL; 1772 } 1773 1774 return 0; 1775 } 1776 1777 static void virtio_net_vnet_pre_save(void *opaque) 1778 { 1779 struct VirtIONetMigTmp *tmp = opaque; 1780 1781 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 1782 } 1783 1784 static const VMStateDescription vmstate_virtio_net_has_vnet = { 1785 .name = "virtio-net-vnet", 1786 .post_load = virtio_net_vnet_post_load, 1787 .pre_save = virtio_net_vnet_pre_save, 1788 .fields = (VMStateField[]) { 1789 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 1790 VMSTATE_END_OF_LIST() 1791 }, 1792 }; 1793 1794 static const VMStateDescription vmstate_virtio_net_device = { 1795 .name = "virtio-net-device", 1796 .version_id = VIRTIO_NET_VM_VERSION, 1797 .minimum_version_id = VIRTIO_NET_VM_VERSION, 1798 .post_load = virtio_net_post_load_device, 1799 .fields = (VMStateField[]) { 1800 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 1801 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 1802 vmstate_virtio_net_queue_tx_waiting, 1803 VirtIONetQueue), 1804 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 1805 VMSTATE_UINT16(status, VirtIONet), 1806 VMSTATE_UINT8(promisc, VirtIONet), 1807 VMSTATE_UINT8(allmulti, VirtIONet), 1808 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 1809 1810 /* Guarded pair: If it fits we load it, else we throw it away 1811 * - can happen if source has a larger MAC table.; post-load 1812 * sets flags in this case. 1813 */ 1814 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 1815 0, mac_table_fits, mac_table.in_use, 1816 ETH_ALEN), 1817 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 1818 mac_table.in_use, ETH_ALEN), 1819 1820 /* Note: This is an array of uint32's that's always been saved as a 1821 * buffer; hold onto your endiannesses; it's actually used as a bitmap 1822 * but based on the uint. 1823 */ 1824 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 1825 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1826 vmstate_virtio_net_has_vnet), 1827 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 1828 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 1829 VMSTATE_UINT8(alluni, VirtIONet), 1830 VMSTATE_UINT8(nomulti, VirtIONet), 1831 VMSTATE_UINT8(nouni, VirtIONet), 1832 VMSTATE_UINT8(nobcast, VirtIONet), 1833 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1834 vmstate_virtio_net_has_ufo), 1835 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0, 1836 vmstate_info_uint16_equal, uint16_t), 1837 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1), 1838 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1839 vmstate_virtio_net_tx_waiting), 1840 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 1841 has_ctrl_guest_offloads), 1842 VMSTATE_END_OF_LIST() 1843 }, 1844 }; 1845 1846 static NetClientInfo net_virtio_info = { 1847 .type = NET_CLIENT_DRIVER_NIC, 1848 .size = sizeof(NICState), 1849 .can_receive = virtio_net_can_receive, 1850 .receive = virtio_net_receive, 1851 .link_status_changed = virtio_net_set_link_status, 1852 .query_rx_filter = virtio_net_query_rxfilter, 1853 }; 1854 1855 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1856 { 1857 VirtIONet *n = VIRTIO_NET(vdev); 1858 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1859 assert(n->vhost_started); 1860 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1861 } 1862 1863 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1864 bool mask) 1865 { 1866 VirtIONet *n = VIRTIO_NET(vdev); 1867 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1868 assert(n->vhost_started); 1869 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1870 vdev, idx, mask); 1871 } 1872 1873 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1874 { 1875 int i, config_size = 0; 1876 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1877 1878 for (i = 0; feature_sizes[i].flags != 0; i++) { 1879 if (host_features & feature_sizes[i].flags) { 1880 config_size = MAX(feature_sizes[i].end, config_size); 1881 } 1882 } 1883 n->config_size = config_size; 1884 } 1885 1886 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1887 const char *type) 1888 { 1889 /* 1890 * The name can be NULL, the netclient name will be type.x. 1891 */ 1892 assert(type != NULL); 1893 1894 g_free(n->netclient_name); 1895 g_free(n->netclient_type); 1896 n->netclient_name = g_strdup(name); 1897 n->netclient_type = g_strdup(type); 1898 } 1899 1900 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1901 { 1902 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1903 VirtIONet *n = VIRTIO_NET(dev); 1904 NetClientState *nc; 1905 int i; 1906 1907 if (n->net_conf.mtu) { 1908 n->host_features |= (0x1 << VIRTIO_NET_F_MTU); 1909 } 1910 1911 virtio_net_set_config_size(n, n->host_features); 1912 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1913 1914 /* 1915 * We set a lower limit on RX queue size to what it always was. 1916 * Guests that want a smaller ring can always resize it without 1917 * help from us (using virtio 1 and up). 1918 */ 1919 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 1920 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 1921 (n->net_conf.rx_queue_size & (n->net_conf.rx_queue_size - 1))) { 1922 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 1923 "must be a power of 2 between %d and %d.", 1924 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 1925 VIRTQUEUE_MAX_SIZE); 1926 virtio_cleanup(vdev); 1927 return; 1928 } 1929 1930 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1931 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 1932 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1933 "must be a positive integer less than %d.", 1934 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 1935 virtio_cleanup(vdev); 1936 return; 1937 } 1938 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1939 n->curr_queues = 1; 1940 n->tx_timeout = n->net_conf.txtimer; 1941 1942 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1943 && strcmp(n->net_conf.tx, "bh")) { 1944 error_report("virtio-net: " 1945 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1946 n->net_conf.tx); 1947 error_report("Defaulting to \"bh\""); 1948 } 1949 1950 for (i = 0; i < n->max_queues; i++) { 1951 virtio_net_add_queue(n, i); 1952 } 1953 1954 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1955 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1956 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1957 n->status = VIRTIO_NET_S_LINK_UP; 1958 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1959 virtio_net_announce_timer, n); 1960 1961 if (n->netclient_type) { 1962 /* 1963 * Happen when virtio_net_set_netclient_name has been called. 1964 */ 1965 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1966 n->netclient_type, n->netclient_name, n); 1967 } else { 1968 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1969 object_get_typename(OBJECT(dev)), dev->id, n); 1970 } 1971 1972 peer_test_vnet_hdr(n); 1973 if (peer_has_vnet_hdr(n)) { 1974 for (i = 0; i < n->max_queues; i++) { 1975 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1976 } 1977 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1978 } else { 1979 n->host_hdr_len = 0; 1980 } 1981 1982 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1983 1984 n->vqs[0].tx_waiting = 0; 1985 n->tx_burst = n->net_conf.txburst; 1986 virtio_net_set_mrg_rx_bufs(n, 0, 0); 1987 n->promisc = 1; /* for compatibility */ 1988 1989 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1990 1991 n->vlans = g_malloc0(MAX_VLAN >> 3); 1992 1993 nc = qemu_get_queue(n->nic); 1994 nc->rxfilter_notify_enabled = 1; 1995 1996 n->qdev = dev; 1997 } 1998 1999 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 2000 { 2001 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 2002 VirtIONet *n = VIRTIO_NET(dev); 2003 int i, max_queues; 2004 2005 /* This will stop vhost backend if appropriate. */ 2006 virtio_net_set_status(vdev, 0); 2007 2008 g_free(n->netclient_name); 2009 n->netclient_name = NULL; 2010 g_free(n->netclient_type); 2011 n->netclient_type = NULL; 2012 2013 g_free(n->mac_table.macs); 2014 g_free(n->vlans); 2015 2016 max_queues = n->multiqueue ? n->max_queues : 1; 2017 for (i = 0; i < max_queues; i++) { 2018 virtio_net_del_queue(n, i); 2019 } 2020 2021 timer_del(n->announce_timer); 2022 timer_free(n->announce_timer); 2023 g_free(n->vqs); 2024 qemu_del_nic(n->nic); 2025 virtio_cleanup(vdev); 2026 } 2027 2028 static void virtio_net_instance_init(Object *obj) 2029 { 2030 VirtIONet *n = VIRTIO_NET(obj); 2031 2032 /* 2033 * The default config_size is sizeof(struct virtio_net_config). 2034 * Can be overriden with virtio_net_set_config_size. 2035 */ 2036 n->config_size = sizeof(struct virtio_net_config); 2037 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 2038 "bootindex", "/ethernet-phy@0", 2039 DEVICE(n), NULL); 2040 } 2041 2042 static void virtio_net_pre_save(void *opaque) 2043 { 2044 VirtIONet *n = opaque; 2045 2046 /* At this point, backend must be stopped, otherwise 2047 * it might keep writing to memory. */ 2048 assert(!n->vhost_started); 2049 } 2050 2051 static const VMStateDescription vmstate_virtio_net = { 2052 .name = "virtio-net", 2053 .minimum_version_id = VIRTIO_NET_VM_VERSION, 2054 .version_id = VIRTIO_NET_VM_VERSION, 2055 .fields = (VMStateField[]) { 2056 VMSTATE_VIRTIO_DEVICE, 2057 VMSTATE_END_OF_LIST() 2058 }, 2059 .pre_save = virtio_net_pre_save, 2060 }; 2061 2062 static Property virtio_net_properties[] = { 2063 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), 2064 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, 2065 VIRTIO_NET_F_GUEST_CSUM, true), 2066 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 2067 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, 2068 VIRTIO_NET_F_GUEST_TSO4, true), 2069 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, 2070 VIRTIO_NET_F_GUEST_TSO6, true), 2071 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, 2072 VIRTIO_NET_F_GUEST_ECN, true), 2073 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, 2074 VIRTIO_NET_F_GUEST_UFO, true), 2075 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, 2076 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 2077 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, 2078 VIRTIO_NET_F_HOST_TSO4, true), 2079 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, 2080 VIRTIO_NET_F_HOST_TSO6, true), 2081 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, 2082 VIRTIO_NET_F_HOST_ECN, true), 2083 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, 2084 VIRTIO_NET_F_HOST_UFO, true), 2085 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, 2086 VIRTIO_NET_F_MRG_RXBUF, true), 2087 DEFINE_PROP_BIT("status", VirtIONet, host_features, 2088 VIRTIO_NET_F_STATUS, true), 2089 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, 2090 VIRTIO_NET_F_CTRL_VQ, true), 2091 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, 2092 VIRTIO_NET_F_CTRL_RX, true), 2093 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, 2094 VIRTIO_NET_F_CTRL_VLAN, true), 2095 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, 2096 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 2097 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, 2098 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 2099 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, 2100 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 2101 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 2102 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 2103 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 2104 TX_TIMER_INTERVAL), 2105 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 2106 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 2107 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 2108 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 2109 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 2110 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 2111 true), 2112 DEFINE_PROP_END_OF_LIST(), 2113 }; 2114 2115 static void virtio_net_class_init(ObjectClass *klass, void *data) 2116 { 2117 DeviceClass *dc = DEVICE_CLASS(klass); 2118 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 2119 2120 dc->props = virtio_net_properties; 2121 dc->vmsd = &vmstate_virtio_net; 2122 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 2123 vdc->realize = virtio_net_device_realize; 2124 vdc->unrealize = virtio_net_device_unrealize; 2125 vdc->get_config = virtio_net_get_config; 2126 vdc->set_config = virtio_net_set_config; 2127 vdc->get_features = virtio_net_get_features; 2128 vdc->set_features = virtio_net_set_features; 2129 vdc->bad_features = virtio_net_bad_features; 2130 vdc->reset = virtio_net_reset; 2131 vdc->set_status = virtio_net_set_status; 2132 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 2133 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 2134 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 2135 vdc->vmsd = &vmstate_virtio_net_device; 2136 } 2137 2138 static const TypeInfo virtio_net_info = { 2139 .name = TYPE_VIRTIO_NET, 2140 .parent = TYPE_VIRTIO_DEVICE, 2141 .instance_size = sizeof(VirtIONet), 2142 .instance_init = virtio_net_instance_init, 2143 .class_init = virtio_net_class_init, 2144 }; 2145 2146 static void virtio_register_types(void) 2147 { 2148 type_register_static(&virtio_net_info); 2149 } 2150 2151 type_init(virtio_register_types) 2152