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/error.h" 26 #include "qapi/qapi-events-net.h" 27 #include "hw/virtio/virtio-access.h" 28 #include "migration/misc.h" 29 #include "standard-headers/linux/ethtool.h" 30 31 #define VIRTIO_NET_VM_VERSION 11 32 33 #define MAC_TABLE_ENTRIES 64 34 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 35 36 /* previously fixed value */ 37 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 38 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256 39 40 /* for now, only allow larger queues; with virtio-1, guest can downsize */ 41 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 42 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 43 44 /* 45 * Calculate the number of bytes up to and including the given 'field' of 46 * 'container'. 47 */ 48 #define endof(container, field) \ 49 (offsetof(container, field) + sizeof_field(container, field)) 50 51 typedef struct VirtIOFeature { 52 uint64_t flags; 53 size_t end; 54 } VirtIOFeature; 55 56 static VirtIOFeature feature_sizes[] = { 57 {.flags = 1ULL << VIRTIO_NET_F_MAC, 58 .end = endof(struct virtio_net_config, mac)}, 59 {.flags = 1ULL << VIRTIO_NET_F_STATUS, 60 .end = endof(struct virtio_net_config, status)}, 61 {.flags = 1ULL << VIRTIO_NET_F_MQ, 62 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 63 {.flags = 1ULL << VIRTIO_NET_F_MTU, 64 .end = endof(struct virtio_net_config, mtu)}, 65 {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX, 66 .end = endof(struct virtio_net_config, duplex)}, 67 {} 68 }; 69 70 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 71 { 72 VirtIONet *n = qemu_get_nic_opaque(nc); 73 74 return &n->vqs[nc->queue_index]; 75 } 76 77 static int vq2q(int queue_index) 78 { 79 return queue_index / 2; 80 } 81 82 /* TODO 83 * - we could suppress RX interrupt if we were so inclined. 84 */ 85 86 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 87 { 88 VirtIONet *n = VIRTIO_NET(vdev); 89 struct virtio_net_config netcfg; 90 91 virtio_stw_p(vdev, &netcfg.status, n->status); 92 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 93 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); 94 memcpy(netcfg.mac, n->mac, ETH_ALEN); 95 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed); 96 netcfg.duplex = n->net_conf.duplex; 97 memcpy(config, &netcfg, n->config_size); 98 } 99 100 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 101 { 102 VirtIONet *n = VIRTIO_NET(vdev); 103 struct virtio_net_config netcfg = {}; 104 105 memcpy(&netcfg, config, n->config_size); 106 107 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 108 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 109 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 110 memcpy(n->mac, netcfg.mac, ETH_ALEN); 111 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 112 } 113 } 114 115 static bool virtio_net_started(VirtIONet *n, uint8_t status) 116 { 117 VirtIODevice *vdev = VIRTIO_DEVICE(n); 118 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 119 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 120 } 121 122 static void virtio_net_announce_timer(void *opaque) 123 { 124 VirtIONet *n = opaque; 125 VirtIODevice *vdev = VIRTIO_DEVICE(n); 126 127 n->announce_counter--; 128 n->status |= VIRTIO_NET_S_ANNOUNCE; 129 virtio_notify_config(vdev); 130 } 131 132 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 133 { 134 VirtIODevice *vdev = VIRTIO_DEVICE(n); 135 NetClientState *nc = qemu_get_queue(n->nic); 136 int queues = n->multiqueue ? n->max_queues : 1; 137 138 if (!get_vhost_net(nc->peer)) { 139 return; 140 } 141 142 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 143 !!n->vhost_started) { 144 return; 145 } 146 if (!n->vhost_started) { 147 int r, i; 148 149 if (n->needs_vnet_hdr_swap) { 150 error_report("backend does not support %s vnet headers; " 151 "falling back on userspace virtio", 152 virtio_is_big_endian(vdev) ? "BE" : "LE"); 153 return; 154 } 155 156 /* Any packets outstanding? Purge them to avoid touching rings 157 * when vhost is running. 158 */ 159 for (i = 0; i < queues; i++) { 160 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 161 162 /* Purge both directions: TX and RX. */ 163 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 164 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 165 } 166 167 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { 168 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); 169 if (r < 0) { 170 error_report("%uBytes MTU not supported by the backend", 171 n->net_conf.mtu); 172 173 return; 174 } 175 } 176 177 n->vhost_started = 1; 178 r = vhost_net_start(vdev, n->nic->ncs, queues); 179 if (r < 0) { 180 error_report("unable to start vhost net: %d: " 181 "falling back on userspace virtio", -r); 182 n->vhost_started = 0; 183 } 184 } else { 185 vhost_net_stop(vdev, n->nic->ncs, queues); 186 n->vhost_started = 0; 187 } 188 } 189 190 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 191 NetClientState *peer, 192 bool enable) 193 { 194 if (virtio_is_big_endian(vdev)) { 195 return qemu_set_vnet_be(peer, enable); 196 } else { 197 return qemu_set_vnet_le(peer, enable); 198 } 199 } 200 201 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 202 int queues, bool enable) 203 { 204 int i; 205 206 for (i = 0; i < queues; i++) { 207 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 208 enable) { 209 while (--i >= 0) { 210 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 211 } 212 213 return true; 214 } 215 } 216 217 return false; 218 } 219 220 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 221 { 222 VirtIODevice *vdev = VIRTIO_DEVICE(n); 223 int queues = n->multiqueue ? n->max_queues : 1; 224 225 if (virtio_net_started(n, status)) { 226 /* Before using the device, we tell the network backend about the 227 * endianness to use when parsing vnet headers. If the backend 228 * can't do it, we fallback onto fixing the headers in the core 229 * virtio-net code. 230 */ 231 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, 232 queues, true); 233 } else if (virtio_net_started(n, vdev->status)) { 234 /* After using the device, we need to reset the network backend to 235 * the default (guest native endianness), otherwise the guest may 236 * lose network connectivity if it is rebooted into a different 237 * endianness. 238 */ 239 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); 240 } 241 } 242 243 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) 244 { 245 unsigned int dropped = virtqueue_drop_all(vq); 246 if (dropped) { 247 virtio_notify(vdev, vq); 248 } 249 } 250 251 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 252 { 253 VirtIONet *n = VIRTIO_NET(vdev); 254 VirtIONetQueue *q; 255 int i; 256 uint8_t queue_status; 257 258 virtio_net_vnet_endian_status(n, status); 259 virtio_net_vhost_status(n, status); 260 261 for (i = 0; i < n->max_queues; i++) { 262 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 263 bool queue_started; 264 q = &n->vqs[i]; 265 266 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 267 queue_status = 0; 268 } else { 269 queue_status = status; 270 } 271 queue_started = 272 virtio_net_started(n, queue_status) && !n->vhost_started; 273 274 if (queue_started) { 275 qemu_flush_queued_packets(ncs); 276 } 277 278 if (!q->tx_waiting) { 279 continue; 280 } 281 282 if (queue_started) { 283 if (q->tx_timer) { 284 timer_mod(q->tx_timer, 285 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 286 } else { 287 qemu_bh_schedule(q->tx_bh); 288 } 289 } else { 290 if (q->tx_timer) { 291 timer_del(q->tx_timer); 292 } else { 293 qemu_bh_cancel(q->tx_bh); 294 } 295 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && 296 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) && 297 vdev->vm_running) { 298 /* if tx is waiting we are likely have some packets in tx queue 299 * and disabled notification */ 300 q->tx_waiting = 0; 301 virtio_queue_set_notification(q->tx_vq, 1); 302 virtio_net_drop_tx_queue_data(vdev, q->tx_vq); 303 } 304 } 305 } 306 } 307 308 static void virtio_net_set_link_status(NetClientState *nc) 309 { 310 VirtIONet *n = qemu_get_nic_opaque(nc); 311 VirtIODevice *vdev = VIRTIO_DEVICE(n); 312 uint16_t old_status = n->status; 313 314 if (nc->link_down) 315 n->status &= ~VIRTIO_NET_S_LINK_UP; 316 else 317 n->status |= VIRTIO_NET_S_LINK_UP; 318 319 if (n->status != old_status) 320 virtio_notify_config(vdev); 321 322 virtio_net_set_status(vdev, vdev->status); 323 } 324 325 static void rxfilter_notify(NetClientState *nc) 326 { 327 VirtIONet *n = qemu_get_nic_opaque(nc); 328 329 if (nc->rxfilter_notify_enabled) { 330 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 331 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 332 n->netclient_name, path); 333 g_free(path); 334 335 /* disable event notification to avoid events flooding */ 336 nc->rxfilter_notify_enabled = 0; 337 } 338 } 339 340 static intList *get_vlan_table(VirtIONet *n) 341 { 342 intList *list, *entry; 343 int i, j; 344 345 list = NULL; 346 for (i = 0; i < MAX_VLAN >> 5; i++) { 347 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 348 if (n->vlans[i] & (1U << j)) { 349 entry = g_malloc0(sizeof(*entry)); 350 entry->value = (i << 5) + j; 351 entry->next = list; 352 list = entry; 353 } 354 } 355 } 356 357 return list; 358 } 359 360 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 361 { 362 VirtIONet *n = qemu_get_nic_opaque(nc); 363 VirtIODevice *vdev = VIRTIO_DEVICE(n); 364 RxFilterInfo *info; 365 strList *str_list, *entry; 366 int i; 367 368 info = g_malloc0(sizeof(*info)); 369 info->name = g_strdup(nc->name); 370 info->promiscuous = n->promisc; 371 372 if (n->nouni) { 373 info->unicast = RX_STATE_NONE; 374 } else if (n->alluni) { 375 info->unicast = RX_STATE_ALL; 376 } else { 377 info->unicast = RX_STATE_NORMAL; 378 } 379 380 if (n->nomulti) { 381 info->multicast = RX_STATE_NONE; 382 } else if (n->allmulti) { 383 info->multicast = RX_STATE_ALL; 384 } else { 385 info->multicast = RX_STATE_NORMAL; 386 } 387 388 info->broadcast_allowed = n->nobcast; 389 info->multicast_overflow = n->mac_table.multi_overflow; 390 info->unicast_overflow = n->mac_table.uni_overflow; 391 392 info->main_mac = qemu_mac_strdup_printf(n->mac); 393 394 str_list = NULL; 395 for (i = 0; i < n->mac_table.first_multi; 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->unicast_table = str_list; 402 403 str_list = NULL; 404 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 405 entry = g_malloc0(sizeof(*entry)); 406 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 407 entry->next = str_list; 408 str_list = entry; 409 } 410 info->multicast_table = str_list; 411 info->vlan_table = get_vlan_table(n); 412 413 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 414 info->vlan = RX_STATE_ALL; 415 } else if (!info->vlan_table) { 416 info->vlan = RX_STATE_NONE; 417 } else { 418 info->vlan = RX_STATE_NORMAL; 419 } 420 421 /* enable event notification after query */ 422 nc->rxfilter_notify_enabled = 1; 423 424 return info; 425 } 426 427 static void virtio_net_reset(VirtIODevice *vdev) 428 { 429 VirtIONet *n = VIRTIO_NET(vdev); 430 int i; 431 432 /* Reset back to compatibility mode */ 433 n->promisc = 1; 434 n->allmulti = 0; 435 n->alluni = 0; 436 n->nomulti = 0; 437 n->nouni = 0; 438 n->nobcast = 0; 439 /* multiqueue is disabled by default */ 440 n->curr_queues = 1; 441 timer_del(n->announce_timer); 442 n->announce_counter = 0; 443 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 444 445 /* Flush any MAC and VLAN filter table state */ 446 n->mac_table.in_use = 0; 447 n->mac_table.first_multi = 0; 448 n->mac_table.multi_overflow = 0; 449 n->mac_table.uni_overflow = 0; 450 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 451 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 452 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 453 memset(n->vlans, 0, MAX_VLAN >> 3); 454 455 /* Flush any async TX */ 456 for (i = 0; i < n->max_queues; i++) { 457 NetClientState *nc = qemu_get_subqueue(n->nic, i); 458 459 if (nc->peer) { 460 qemu_flush_or_purge_queued_packets(nc->peer, true); 461 assert(!virtio_net_get_subqueue(nc)->async_tx.elem); 462 } 463 } 464 } 465 466 static void peer_test_vnet_hdr(VirtIONet *n) 467 { 468 NetClientState *nc = qemu_get_queue(n->nic); 469 if (!nc->peer) { 470 return; 471 } 472 473 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 474 } 475 476 static int peer_has_vnet_hdr(VirtIONet *n) 477 { 478 return n->has_vnet_hdr; 479 } 480 481 static int peer_has_ufo(VirtIONet *n) 482 { 483 if (!peer_has_vnet_hdr(n)) 484 return 0; 485 486 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 487 488 return n->has_ufo; 489 } 490 491 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 492 int version_1) 493 { 494 int i; 495 NetClientState *nc; 496 497 n->mergeable_rx_bufs = mergeable_rx_bufs; 498 499 if (version_1) { 500 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 501 } else { 502 n->guest_hdr_len = n->mergeable_rx_bufs ? 503 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 504 sizeof(struct virtio_net_hdr); 505 } 506 507 for (i = 0; i < n->max_queues; i++) { 508 nc = qemu_get_subqueue(n->nic, i); 509 510 if (peer_has_vnet_hdr(n) && 511 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 512 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 513 n->host_hdr_len = n->guest_hdr_len; 514 } 515 } 516 } 517 518 static int virtio_net_max_tx_queue_size(VirtIONet *n) 519 { 520 NetClientState *peer = n->nic_conf.peers.ncs[0]; 521 522 /* 523 * Backends other than vhost-user don't support max queue size. 524 */ 525 if (!peer) { 526 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 527 } 528 529 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) { 530 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 531 } 532 533 return VIRTQUEUE_MAX_SIZE; 534 } 535 536 static int peer_attach(VirtIONet *n, int index) 537 { 538 NetClientState *nc = qemu_get_subqueue(n->nic, index); 539 540 if (!nc->peer) { 541 return 0; 542 } 543 544 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 545 vhost_set_vring_enable(nc->peer, 1); 546 } 547 548 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 549 return 0; 550 } 551 552 if (n->max_queues == 1) { 553 return 0; 554 } 555 556 return tap_enable(nc->peer); 557 } 558 559 static int peer_detach(VirtIONet *n, int index) 560 { 561 NetClientState *nc = qemu_get_subqueue(n->nic, index); 562 563 if (!nc->peer) { 564 return 0; 565 } 566 567 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 568 vhost_set_vring_enable(nc->peer, 0); 569 } 570 571 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 572 return 0; 573 } 574 575 return tap_disable(nc->peer); 576 } 577 578 static void virtio_net_set_queues(VirtIONet *n) 579 { 580 int i; 581 int r; 582 583 if (n->nic->peer_deleted) { 584 return; 585 } 586 587 for (i = 0; i < n->max_queues; i++) { 588 if (i < n->curr_queues) { 589 r = peer_attach(n, i); 590 assert(!r); 591 } else { 592 r = peer_detach(n, i); 593 assert(!r); 594 } 595 } 596 } 597 598 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 599 600 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 601 Error **errp) 602 { 603 VirtIONet *n = VIRTIO_NET(vdev); 604 NetClientState *nc = qemu_get_queue(n->nic); 605 606 /* Firstly sync all virtio-net possible supported features */ 607 features |= n->host_features; 608 609 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 610 611 if (!peer_has_vnet_hdr(n)) { 612 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 613 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 614 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 615 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 616 617 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 618 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 619 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 620 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 621 } 622 623 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 624 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 625 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 626 } 627 628 if (!get_vhost_net(nc->peer)) { 629 return features; 630 } 631 features = vhost_net_get_features(get_vhost_net(nc->peer), features); 632 vdev->backend_features = features; 633 634 if (n->mtu_bypass_backend && 635 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { 636 features |= (1ULL << VIRTIO_NET_F_MTU); 637 } 638 639 return features; 640 } 641 642 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 643 { 644 uint64_t features = 0; 645 646 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 647 * but also these: */ 648 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 649 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 650 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 651 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 652 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 653 654 return features; 655 } 656 657 static void virtio_net_apply_guest_offloads(VirtIONet *n) 658 { 659 qemu_set_offload(qemu_get_queue(n->nic)->peer, 660 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 661 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 662 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 663 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 664 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 665 } 666 667 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 668 { 669 static const uint64_t guest_offloads_mask = 670 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 671 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 672 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 673 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 674 (1ULL << VIRTIO_NET_F_GUEST_UFO); 675 676 return guest_offloads_mask & features; 677 } 678 679 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 680 { 681 VirtIODevice *vdev = VIRTIO_DEVICE(n); 682 return virtio_net_guest_offloads_by_features(vdev->guest_features); 683 } 684 685 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 686 { 687 VirtIONet *n = VIRTIO_NET(vdev); 688 int i; 689 690 if (n->mtu_bypass_backend && 691 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { 692 features &= ~(1ULL << VIRTIO_NET_F_MTU); 693 } 694 695 virtio_net_set_multiqueue(n, 696 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 697 698 virtio_net_set_mrg_rx_bufs(n, 699 virtio_has_feature(features, 700 VIRTIO_NET_F_MRG_RXBUF), 701 virtio_has_feature(features, 702 VIRTIO_F_VERSION_1)); 703 704 if (n->has_vnet_hdr) { 705 n->curr_guest_offloads = 706 virtio_net_guest_offloads_by_features(features); 707 virtio_net_apply_guest_offloads(n); 708 } 709 710 for (i = 0; i < n->max_queues; i++) { 711 NetClientState *nc = qemu_get_subqueue(n->nic, i); 712 713 if (!get_vhost_net(nc->peer)) { 714 continue; 715 } 716 vhost_net_ack_features(get_vhost_net(nc->peer), features); 717 } 718 719 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 720 memset(n->vlans, 0, MAX_VLAN >> 3); 721 } else { 722 memset(n->vlans, 0xff, MAX_VLAN >> 3); 723 } 724 } 725 726 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 727 struct iovec *iov, unsigned int iov_cnt) 728 { 729 uint8_t on; 730 size_t s; 731 NetClientState *nc = qemu_get_queue(n->nic); 732 733 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 734 if (s != sizeof(on)) { 735 return VIRTIO_NET_ERR; 736 } 737 738 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 739 n->promisc = on; 740 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 741 n->allmulti = on; 742 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 743 n->alluni = on; 744 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 745 n->nomulti = on; 746 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 747 n->nouni = on; 748 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 749 n->nobcast = on; 750 } else { 751 return VIRTIO_NET_ERR; 752 } 753 754 rxfilter_notify(nc); 755 756 return VIRTIO_NET_OK; 757 } 758 759 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 760 struct iovec *iov, unsigned int iov_cnt) 761 { 762 VirtIODevice *vdev = VIRTIO_DEVICE(n); 763 uint64_t offloads; 764 size_t s; 765 766 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 767 return VIRTIO_NET_ERR; 768 } 769 770 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 771 if (s != sizeof(offloads)) { 772 return VIRTIO_NET_ERR; 773 } 774 775 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 776 uint64_t supported_offloads; 777 778 offloads = virtio_ldq_p(vdev, &offloads); 779 780 if (!n->has_vnet_hdr) { 781 return VIRTIO_NET_ERR; 782 } 783 784 supported_offloads = virtio_net_supported_guest_offloads(n); 785 if (offloads & ~supported_offloads) { 786 return VIRTIO_NET_ERR; 787 } 788 789 n->curr_guest_offloads = offloads; 790 virtio_net_apply_guest_offloads(n); 791 792 return VIRTIO_NET_OK; 793 } else { 794 return VIRTIO_NET_ERR; 795 } 796 } 797 798 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 799 struct iovec *iov, unsigned int iov_cnt) 800 { 801 VirtIODevice *vdev = VIRTIO_DEVICE(n); 802 struct virtio_net_ctrl_mac mac_data; 803 size_t s; 804 NetClientState *nc = qemu_get_queue(n->nic); 805 806 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 807 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 808 return VIRTIO_NET_ERR; 809 } 810 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 811 assert(s == sizeof(n->mac)); 812 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 813 rxfilter_notify(nc); 814 815 return VIRTIO_NET_OK; 816 } 817 818 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 819 return VIRTIO_NET_ERR; 820 } 821 822 int in_use = 0; 823 int first_multi = 0; 824 uint8_t uni_overflow = 0; 825 uint8_t multi_overflow = 0; 826 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 827 828 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 829 sizeof(mac_data.entries)); 830 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 831 if (s != sizeof(mac_data.entries)) { 832 goto error; 833 } 834 iov_discard_front(&iov, &iov_cnt, s); 835 836 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 837 goto error; 838 } 839 840 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 841 s = iov_to_buf(iov, iov_cnt, 0, macs, 842 mac_data.entries * ETH_ALEN); 843 if (s != mac_data.entries * ETH_ALEN) { 844 goto error; 845 } 846 in_use += mac_data.entries; 847 } else { 848 uni_overflow = 1; 849 } 850 851 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 852 853 first_multi = in_use; 854 855 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 856 sizeof(mac_data.entries)); 857 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 858 if (s != sizeof(mac_data.entries)) { 859 goto error; 860 } 861 862 iov_discard_front(&iov, &iov_cnt, s); 863 864 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 865 goto error; 866 } 867 868 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 869 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 870 mac_data.entries * ETH_ALEN); 871 if (s != mac_data.entries * ETH_ALEN) { 872 goto error; 873 } 874 in_use += mac_data.entries; 875 } else { 876 multi_overflow = 1; 877 } 878 879 n->mac_table.in_use = in_use; 880 n->mac_table.first_multi = first_multi; 881 n->mac_table.uni_overflow = uni_overflow; 882 n->mac_table.multi_overflow = multi_overflow; 883 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 884 g_free(macs); 885 rxfilter_notify(nc); 886 887 return VIRTIO_NET_OK; 888 889 error: 890 g_free(macs); 891 return VIRTIO_NET_ERR; 892 } 893 894 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 895 struct iovec *iov, unsigned int iov_cnt) 896 { 897 VirtIODevice *vdev = VIRTIO_DEVICE(n); 898 uint16_t vid; 899 size_t s; 900 NetClientState *nc = qemu_get_queue(n->nic); 901 902 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 903 vid = virtio_lduw_p(vdev, &vid); 904 if (s != sizeof(vid)) { 905 return VIRTIO_NET_ERR; 906 } 907 908 if (vid >= MAX_VLAN) 909 return VIRTIO_NET_ERR; 910 911 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 912 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 913 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 914 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 915 else 916 return VIRTIO_NET_ERR; 917 918 rxfilter_notify(nc); 919 920 return VIRTIO_NET_OK; 921 } 922 923 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 924 struct iovec *iov, unsigned int iov_cnt) 925 { 926 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 927 n->status & VIRTIO_NET_S_ANNOUNCE) { 928 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 929 if (n->announce_counter) { 930 timer_mod(n->announce_timer, 931 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 932 self_announce_delay(n->announce_counter)); 933 } 934 return VIRTIO_NET_OK; 935 } else { 936 return VIRTIO_NET_ERR; 937 } 938 } 939 940 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 941 struct iovec *iov, unsigned int iov_cnt) 942 { 943 VirtIODevice *vdev = VIRTIO_DEVICE(n); 944 struct virtio_net_ctrl_mq mq; 945 size_t s; 946 uint16_t queues; 947 948 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 949 if (s != sizeof(mq)) { 950 return VIRTIO_NET_ERR; 951 } 952 953 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 954 return VIRTIO_NET_ERR; 955 } 956 957 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 958 959 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 960 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 961 queues > n->max_queues || 962 !n->multiqueue) { 963 return VIRTIO_NET_ERR; 964 } 965 966 n->curr_queues = queues; 967 /* stop the backend before changing the number of queues to avoid handling a 968 * disabled queue */ 969 virtio_net_set_status(vdev, vdev->status); 970 virtio_net_set_queues(n); 971 972 return VIRTIO_NET_OK; 973 } 974 975 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 976 { 977 VirtIONet *n = VIRTIO_NET(vdev); 978 struct virtio_net_ctrl_hdr ctrl; 979 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 980 VirtQueueElement *elem; 981 size_t s; 982 struct iovec *iov, *iov2; 983 unsigned int iov_cnt; 984 985 for (;;) { 986 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 987 if (!elem) { 988 break; 989 } 990 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || 991 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { 992 virtio_error(vdev, "virtio-net ctrl missing headers"); 993 virtqueue_detach_element(vq, elem, 0); 994 g_free(elem); 995 break; 996 } 997 998 iov_cnt = elem->out_num; 999 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); 1000 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 1001 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 1002 if (s != sizeof(ctrl)) { 1003 status = VIRTIO_NET_ERR; 1004 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 1005 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 1006 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 1007 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 1008 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 1009 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 1010 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 1011 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 1012 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 1013 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 1014 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 1015 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 1016 } 1017 1018 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); 1019 assert(s == sizeof(status)); 1020 1021 virtqueue_push(vq, elem, sizeof(status)); 1022 virtio_notify(vdev, vq); 1023 g_free(iov2); 1024 g_free(elem); 1025 } 1026 } 1027 1028 /* RX */ 1029 1030 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 1031 { 1032 VirtIONet *n = VIRTIO_NET(vdev); 1033 int queue_index = vq2q(virtio_get_queue_index(vq)); 1034 1035 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 1036 } 1037 1038 static int virtio_net_can_receive(NetClientState *nc) 1039 { 1040 VirtIONet *n = qemu_get_nic_opaque(nc); 1041 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1042 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1043 1044 if (!vdev->vm_running) { 1045 return 0; 1046 } 1047 1048 if (nc->queue_index >= n->curr_queues) { 1049 return 0; 1050 } 1051 1052 if (!virtio_queue_ready(q->rx_vq) || 1053 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1054 return 0; 1055 } 1056 1057 return 1; 1058 } 1059 1060 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1061 { 1062 VirtIONet *n = q->n; 1063 if (virtio_queue_empty(q->rx_vq) || 1064 (n->mergeable_rx_bufs && 1065 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1066 virtio_queue_set_notification(q->rx_vq, 1); 1067 1068 /* To avoid a race condition where the guest has made some buffers 1069 * available after the above check but before notification was 1070 * enabled, check for available buffers again. 1071 */ 1072 if (virtio_queue_empty(q->rx_vq) || 1073 (n->mergeable_rx_bufs && 1074 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1075 return 0; 1076 } 1077 } 1078 1079 virtio_queue_set_notification(q->rx_vq, 0); 1080 return 1; 1081 } 1082 1083 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1084 { 1085 virtio_tswap16s(vdev, &hdr->hdr_len); 1086 virtio_tswap16s(vdev, &hdr->gso_size); 1087 virtio_tswap16s(vdev, &hdr->csum_start); 1088 virtio_tswap16s(vdev, &hdr->csum_offset); 1089 } 1090 1091 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1092 * it never finds out that the packets don't have valid checksums. This 1093 * causes dhclient to get upset. Fedora's carried a patch for ages to 1094 * fix this with Xen but it hasn't appeared in an upstream release of 1095 * dhclient yet. 1096 * 1097 * To avoid breaking existing guests, we catch udp packets and add 1098 * checksums. This is terrible but it's better than hacking the guest 1099 * kernels. 1100 * 1101 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1102 * we should provide a mechanism to disable it to avoid polluting the host 1103 * cache. 1104 */ 1105 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1106 uint8_t *buf, size_t size) 1107 { 1108 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1109 (size > 27 && size < 1500) && /* normal sized MTU */ 1110 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1111 (buf[23] == 17) && /* ip.protocol == UDP */ 1112 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1113 net_checksum_calculate(buf, size); 1114 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1115 } 1116 } 1117 1118 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1119 const void *buf, size_t size) 1120 { 1121 if (n->has_vnet_hdr) { 1122 /* FIXME this cast is evil */ 1123 void *wbuf = (void *)buf; 1124 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1125 size - n->host_hdr_len); 1126 1127 if (n->needs_vnet_hdr_swap) { 1128 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1129 } 1130 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1131 } else { 1132 struct virtio_net_hdr hdr = { 1133 .flags = 0, 1134 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1135 }; 1136 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1137 } 1138 } 1139 1140 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1141 { 1142 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1143 static const uint8_t vlan[] = {0x81, 0x00}; 1144 uint8_t *ptr = (uint8_t *)buf; 1145 int i; 1146 1147 if (n->promisc) 1148 return 1; 1149 1150 ptr += n->host_hdr_len; 1151 1152 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1153 int vid = lduw_be_p(ptr + 14) & 0xfff; 1154 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1155 return 0; 1156 } 1157 1158 if (ptr[0] & 1) { // multicast 1159 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1160 return !n->nobcast; 1161 } else if (n->nomulti) { 1162 return 0; 1163 } else if (n->allmulti || n->mac_table.multi_overflow) { 1164 return 1; 1165 } 1166 1167 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1168 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1169 return 1; 1170 } 1171 } 1172 } else { // unicast 1173 if (n->nouni) { 1174 return 0; 1175 } else if (n->alluni || n->mac_table.uni_overflow) { 1176 return 1; 1177 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1178 return 1; 1179 } 1180 1181 for (i = 0; i < n->mac_table.first_multi; i++) { 1182 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1183 return 1; 1184 } 1185 } 1186 } 1187 1188 return 0; 1189 } 1190 1191 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1192 size_t size) 1193 { 1194 VirtIONet *n = qemu_get_nic_opaque(nc); 1195 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1196 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1197 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1198 struct virtio_net_hdr_mrg_rxbuf mhdr; 1199 unsigned mhdr_cnt = 0; 1200 size_t offset, i, guest_offset; 1201 1202 if (!virtio_net_can_receive(nc)) { 1203 return -1; 1204 } 1205 1206 /* hdr_len refers to the header we supply to the guest */ 1207 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1208 return 0; 1209 } 1210 1211 if (!receive_filter(n, buf, size)) 1212 return size; 1213 1214 offset = i = 0; 1215 1216 while (offset < size) { 1217 VirtQueueElement *elem; 1218 int len, total; 1219 const struct iovec *sg; 1220 1221 total = 0; 1222 1223 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1224 if (!elem) { 1225 if (i) { 1226 virtio_error(vdev, "virtio-net unexpected empty queue: " 1227 "i %zd mergeable %d offset %zd, size %zd, " 1228 "guest hdr len %zd, host hdr len %zd " 1229 "guest features 0x%" PRIx64, 1230 i, n->mergeable_rx_bufs, offset, size, 1231 n->guest_hdr_len, n->host_hdr_len, 1232 vdev->guest_features); 1233 } 1234 return -1; 1235 } 1236 1237 if (elem->in_num < 1) { 1238 virtio_error(vdev, 1239 "virtio-net receive queue contains no in buffers"); 1240 virtqueue_detach_element(q->rx_vq, elem, 0); 1241 g_free(elem); 1242 return -1; 1243 } 1244 1245 sg = elem->in_sg; 1246 if (i == 0) { 1247 assert(offset == 0); 1248 if (n->mergeable_rx_bufs) { 1249 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1250 sg, elem->in_num, 1251 offsetof(typeof(mhdr), num_buffers), 1252 sizeof(mhdr.num_buffers)); 1253 } 1254 1255 receive_header(n, sg, elem->in_num, buf, size); 1256 offset = n->host_hdr_len; 1257 total += n->guest_hdr_len; 1258 guest_offset = n->guest_hdr_len; 1259 } else { 1260 guest_offset = 0; 1261 } 1262 1263 /* copy in packet. ugh */ 1264 len = iov_from_buf(sg, elem->in_num, guest_offset, 1265 buf + offset, size - offset); 1266 total += len; 1267 offset += len; 1268 /* If buffers can't be merged, at this point we 1269 * must have consumed the complete packet. 1270 * Otherwise, drop it. */ 1271 if (!n->mergeable_rx_bufs && offset < size) { 1272 virtqueue_unpop(q->rx_vq, elem, total); 1273 g_free(elem); 1274 return size; 1275 } 1276 1277 /* signal other side */ 1278 virtqueue_fill(q->rx_vq, elem, total, i++); 1279 g_free(elem); 1280 } 1281 1282 if (mhdr_cnt) { 1283 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1284 iov_from_buf(mhdr_sg, mhdr_cnt, 1285 0, 1286 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1287 } 1288 1289 virtqueue_flush(q->rx_vq, i); 1290 virtio_notify(vdev, q->rx_vq); 1291 1292 return size; 1293 } 1294 1295 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 1296 size_t size) 1297 { 1298 ssize_t r; 1299 1300 rcu_read_lock(); 1301 r = virtio_net_receive_rcu(nc, buf, size); 1302 rcu_read_unlock(); 1303 return r; 1304 } 1305 1306 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1307 1308 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1309 { 1310 VirtIONet *n = qemu_get_nic_opaque(nc); 1311 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1312 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1313 1314 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 1315 virtio_notify(vdev, q->tx_vq); 1316 1317 g_free(q->async_tx.elem); 1318 q->async_tx.elem = NULL; 1319 1320 virtio_queue_set_notification(q->tx_vq, 1); 1321 virtio_net_flush_tx(q); 1322 } 1323 1324 /* TX */ 1325 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1326 { 1327 VirtIONet *n = q->n; 1328 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1329 VirtQueueElement *elem; 1330 int32_t num_packets = 0; 1331 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1332 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1333 return num_packets; 1334 } 1335 1336 if (q->async_tx.elem) { 1337 virtio_queue_set_notification(q->tx_vq, 0); 1338 return num_packets; 1339 } 1340 1341 for (;;) { 1342 ssize_t ret; 1343 unsigned int out_num; 1344 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 1345 struct virtio_net_hdr_mrg_rxbuf mhdr; 1346 1347 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 1348 if (!elem) { 1349 break; 1350 } 1351 1352 out_num = elem->out_num; 1353 out_sg = elem->out_sg; 1354 if (out_num < 1) { 1355 virtio_error(vdev, "virtio-net header not in first element"); 1356 virtqueue_detach_element(q->tx_vq, elem, 0); 1357 g_free(elem); 1358 return -EINVAL; 1359 } 1360 1361 if (n->has_vnet_hdr) { 1362 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < 1363 n->guest_hdr_len) { 1364 virtio_error(vdev, "virtio-net header incorrect"); 1365 virtqueue_detach_element(q->tx_vq, elem, 0); 1366 g_free(elem); 1367 return -EINVAL; 1368 } 1369 if (n->needs_vnet_hdr_swap) { 1370 virtio_net_hdr_swap(vdev, (void *) &mhdr); 1371 sg2[0].iov_base = &mhdr; 1372 sg2[0].iov_len = n->guest_hdr_len; 1373 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, 1374 out_sg, out_num, 1375 n->guest_hdr_len, -1); 1376 if (out_num == VIRTQUEUE_MAX_SIZE) { 1377 goto drop; 1378 } 1379 out_num += 1; 1380 out_sg = sg2; 1381 } 1382 } 1383 /* 1384 * If host wants to see the guest header as is, we can 1385 * pass it on unchanged. Otherwise, copy just the parts 1386 * that host is interested in. 1387 */ 1388 assert(n->host_hdr_len <= n->guest_hdr_len); 1389 if (n->host_hdr_len != n->guest_hdr_len) { 1390 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1391 out_sg, out_num, 1392 0, n->host_hdr_len); 1393 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1394 out_sg, out_num, 1395 n->guest_hdr_len, -1); 1396 out_num = sg_num; 1397 out_sg = sg; 1398 } 1399 1400 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1401 out_sg, out_num, virtio_net_tx_complete); 1402 if (ret == 0) { 1403 virtio_queue_set_notification(q->tx_vq, 0); 1404 q->async_tx.elem = elem; 1405 return -EBUSY; 1406 } 1407 1408 drop: 1409 virtqueue_push(q->tx_vq, elem, 0); 1410 virtio_notify(vdev, q->tx_vq); 1411 g_free(elem); 1412 1413 if (++num_packets >= n->tx_burst) { 1414 break; 1415 } 1416 } 1417 return num_packets; 1418 } 1419 1420 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1421 { 1422 VirtIONet *n = VIRTIO_NET(vdev); 1423 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1424 1425 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1426 virtio_net_drop_tx_queue_data(vdev, vq); 1427 return; 1428 } 1429 1430 /* This happens when device was stopped but VCPU wasn't. */ 1431 if (!vdev->vm_running) { 1432 q->tx_waiting = 1; 1433 return; 1434 } 1435 1436 if (q->tx_waiting) { 1437 virtio_queue_set_notification(vq, 1); 1438 timer_del(q->tx_timer); 1439 q->tx_waiting = 0; 1440 if (virtio_net_flush_tx(q) == -EINVAL) { 1441 return; 1442 } 1443 } else { 1444 timer_mod(q->tx_timer, 1445 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1446 q->tx_waiting = 1; 1447 virtio_queue_set_notification(vq, 0); 1448 } 1449 } 1450 1451 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1452 { 1453 VirtIONet *n = VIRTIO_NET(vdev); 1454 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1455 1456 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1457 virtio_net_drop_tx_queue_data(vdev, vq); 1458 return; 1459 } 1460 1461 if (unlikely(q->tx_waiting)) { 1462 return; 1463 } 1464 q->tx_waiting = 1; 1465 /* This happens when device was stopped but VCPU wasn't. */ 1466 if (!vdev->vm_running) { 1467 return; 1468 } 1469 virtio_queue_set_notification(vq, 0); 1470 qemu_bh_schedule(q->tx_bh); 1471 } 1472 1473 static void virtio_net_tx_timer(void *opaque) 1474 { 1475 VirtIONetQueue *q = opaque; 1476 VirtIONet *n = q->n; 1477 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1478 /* This happens when device was stopped but BH wasn't. */ 1479 if (!vdev->vm_running) { 1480 /* Make sure tx waiting is set, so we'll run when restarted. */ 1481 assert(q->tx_waiting); 1482 return; 1483 } 1484 1485 q->tx_waiting = 0; 1486 1487 /* Just in case the driver is not ready on more */ 1488 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1489 return; 1490 } 1491 1492 virtio_queue_set_notification(q->tx_vq, 1); 1493 virtio_net_flush_tx(q); 1494 } 1495 1496 static void virtio_net_tx_bh(void *opaque) 1497 { 1498 VirtIONetQueue *q = opaque; 1499 VirtIONet *n = q->n; 1500 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1501 int32_t ret; 1502 1503 /* This happens when device was stopped but BH wasn't. */ 1504 if (!vdev->vm_running) { 1505 /* Make sure tx waiting is set, so we'll run when restarted. */ 1506 assert(q->tx_waiting); 1507 return; 1508 } 1509 1510 q->tx_waiting = 0; 1511 1512 /* Just in case the driver is not ready on more */ 1513 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1514 return; 1515 } 1516 1517 ret = virtio_net_flush_tx(q); 1518 if (ret == -EBUSY || ret == -EINVAL) { 1519 return; /* Notification re-enable handled by tx_complete or device 1520 * broken */ 1521 } 1522 1523 /* If we flush a full burst of packets, assume there are 1524 * more coming and immediately reschedule */ 1525 if (ret >= n->tx_burst) { 1526 qemu_bh_schedule(q->tx_bh); 1527 q->tx_waiting = 1; 1528 return; 1529 } 1530 1531 /* If less than a full burst, re-enable notification and flush 1532 * anything that may have come in while we weren't looking. If 1533 * we find something, assume the guest is still active and reschedule */ 1534 virtio_queue_set_notification(q->tx_vq, 1); 1535 ret = virtio_net_flush_tx(q); 1536 if (ret == -EINVAL) { 1537 return; 1538 } else if (ret > 0) { 1539 virtio_queue_set_notification(q->tx_vq, 0); 1540 qemu_bh_schedule(q->tx_bh); 1541 q->tx_waiting = 1; 1542 } 1543 } 1544 1545 static void virtio_net_add_queue(VirtIONet *n, int index) 1546 { 1547 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1548 1549 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 1550 virtio_net_handle_rx); 1551 1552 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1553 n->vqs[index].tx_vq = 1554 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 1555 virtio_net_handle_tx_timer); 1556 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1557 virtio_net_tx_timer, 1558 &n->vqs[index]); 1559 } else { 1560 n->vqs[index].tx_vq = 1561 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 1562 virtio_net_handle_tx_bh); 1563 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); 1564 } 1565 1566 n->vqs[index].tx_waiting = 0; 1567 n->vqs[index].n = n; 1568 } 1569 1570 static void virtio_net_del_queue(VirtIONet *n, int index) 1571 { 1572 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1573 VirtIONetQueue *q = &n->vqs[index]; 1574 NetClientState *nc = qemu_get_subqueue(n->nic, index); 1575 1576 qemu_purge_queued_packets(nc); 1577 1578 virtio_del_queue(vdev, index * 2); 1579 if (q->tx_timer) { 1580 timer_del(q->tx_timer); 1581 timer_free(q->tx_timer); 1582 q->tx_timer = NULL; 1583 } else { 1584 qemu_bh_delete(q->tx_bh); 1585 q->tx_bh = NULL; 1586 } 1587 q->tx_waiting = 0; 1588 virtio_del_queue(vdev, index * 2 + 1); 1589 } 1590 1591 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) 1592 { 1593 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1594 int old_num_queues = virtio_get_num_queues(vdev); 1595 int new_num_queues = new_max_queues * 2 + 1; 1596 int i; 1597 1598 assert(old_num_queues >= 3); 1599 assert(old_num_queues % 2 == 1); 1600 1601 if (old_num_queues == new_num_queues) { 1602 return; 1603 } 1604 1605 /* 1606 * We always need to remove and add ctrl vq if 1607 * old_num_queues != new_num_queues. Remove ctrl_vq first, 1608 * and then we only enter one of the following too loops. 1609 */ 1610 virtio_del_queue(vdev, old_num_queues - 1); 1611 1612 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 1613 /* new_num_queues < old_num_queues */ 1614 virtio_net_del_queue(n, i / 2); 1615 } 1616 1617 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 1618 /* new_num_queues > old_num_queues */ 1619 virtio_net_add_queue(n, i / 2); 1620 } 1621 1622 /* add ctrl_vq last */ 1623 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1624 } 1625 1626 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1627 { 1628 int max = multiqueue ? n->max_queues : 1; 1629 1630 n->multiqueue = multiqueue; 1631 virtio_net_change_num_queues(n, max); 1632 1633 virtio_net_set_queues(n); 1634 } 1635 1636 static int virtio_net_post_load_device(void *opaque, int version_id) 1637 { 1638 VirtIONet *n = opaque; 1639 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1640 int i, link_down; 1641 1642 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 1643 virtio_vdev_has_feature(vdev, 1644 VIRTIO_F_VERSION_1)); 1645 1646 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1647 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 1648 n->mac_table.in_use = 0; 1649 } 1650 1651 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1652 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1653 } 1654 1655 if (peer_has_vnet_hdr(n)) { 1656 virtio_net_apply_guest_offloads(n); 1657 } 1658 1659 virtio_net_set_queues(n); 1660 1661 /* Find the first multicast entry in the saved MAC filter */ 1662 for (i = 0; i < n->mac_table.in_use; i++) { 1663 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1664 break; 1665 } 1666 } 1667 n->mac_table.first_multi = i; 1668 1669 /* nc.link_down can't be migrated, so infer link_down according 1670 * to link status bit in n->status */ 1671 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1672 for (i = 0; i < n->max_queues; i++) { 1673 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1674 } 1675 1676 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1677 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1678 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1679 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1680 } 1681 1682 return 0; 1683 } 1684 1685 /* tx_waiting field of a VirtIONetQueue */ 1686 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 1687 .name = "virtio-net-queue-tx_waiting", 1688 .fields = (VMStateField[]) { 1689 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 1690 VMSTATE_END_OF_LIST() 1691 }, 1692 }; 1693 1694 static bool max_queues_gt_1(void *opaque, int version_id) 1695 { 1696 return VIRTIO_NET(opaque)->max_queues > 1; 1697 } 1698 1699 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 1700 { 1701 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 1702 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 1703 } 1704 1705 static bool mac_table_fits(void *opaque, int version_id) 1706 { 1707 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 1708 } 1709 1710 static bool mac_table_doesnt_fit(void *opaque, int version_id) 1711 { 1712 return !mac_table_fits(opaque, version_id); 1713 } 1714 1715 /* This temporary type is shared by all the WITH_TMP methods 1716 * although only some fields are used by each. 1717 */ 1718 struct VirtIONetMigTmp { 1719 VirtIONet *parent; 1720 VirtIONetQueue *vqs_1; 1721 uint16_t curr_queues_1; 1722 uint8_t has_ufo; 1723 uint32_t has_vnet_hdr; 1724 }; 1725 1726 /* The 2nd and subsequent tx_waiting flags are loaded later than 1727 * the 1st entry in the queues and only if there's more than one 1728 * entry. We use the tmp mechanism to calculate a temporary 1729 * pointer and count and also validate the count. 1730 */ 1731 1732 static int virtio_net_tx_waiting_pre_save(void *opaque) 1733 { 1734 struct VirtIONetMigTmp *tmp = opaque; 1735 1736 tmp->vqs_1 = tmp->parent->vqs + 1; 1737 tmp->curr_queues_1 = tmp->parent->curr_queues - 1; 1738 if (tmp->parent->curr_queues == 0) { 1739 tmp->curr_queues_1 = 0; 1740 } 1741 1742 return 0; 1743 } 1744 1745 static int virtio_net_tx_waiting_pre_load(void *opaque) 1746 { 1747 struct VirtIONetMigTmp *tmp = opaque; 1748 1749 /* Reuse the pointer setup from save */ 1750 virtio_net_tx_waiting_pre_save(opaque); 1751 1752 if (tmp->parent->curr_queues > tmp->parent->max_queues) { 1753 error_report("virtio-net: curr_queues %x > max_queues %x", 1754 tmp->parent->curr_queues, tmp->parent->max_queues); 1755 1756 return -EINVAL; 1757 } 1758 1759 return 0; /* all good */ 1760 } 1761 1762 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 1763 .name = "virtio-net-tx_waiting", 1764 .pre_load = virtio_net_tx_waiting_pre_load, 1765 .pre_save = virtio_net_tx_waiting_pre_save, 1766 .fields = (VMStateField[]) { 1767 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 1768 curr_queues_1, 1769 vmstate_virtio_net_queue_tx_waiting, 1770 struct VirtIONetQueue), 1771 VMSTATE_END_OF_LIST() 1772 }, 1773 }; 1774 1775 /* the 'has_ufo' flag is just tested; if the incoming stream has the 1776 * flag set we need to check that we have it 1777 */ 1778 static int virtio_net_ufo_post_load(void *opaque, int version_id) 1779 { 1780 struct VirtIONetMigTmp *tmp = opaque; 1781 1782 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 1783 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1784 return -EINVAL; 1785 } 1786 1787 return 0; 1788 } 1789 1790 static int virtio_net_ufo_pre_save(void *opaque) 1791 { 1792 struct VirtIONetMigTmp *tmp = opaque; 1793 1794 tmp->has_ufo = tmp->parent->has_ufo; 1795 1796 return 0; 1797 } 1798 1799 static const VMStateDescription vmstate_virtio_net_has_ufo = { 1800 .name = "virtio-net-ufo", 1801 .post_load = virtio_net_ufo_post_load, 1802 .pre_save = virtio_net_ufo_pre_save, 1803 .fields = (VMStateField[]) { 1804 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 1805 VMSTATE_END_OF_LIST() 1806 }, 1807 }; 1808 1809 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 1810 * flag set we need to check that we have it 1811 */ 1812 static int virtio_net_vnet_post_load(void *opaque, int version_id) 1813 { 1814 struct VirtIONetMigTmp *tmp = opaque; 1815 1816 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 1817 error_report("virtio-net: saved image requires vnet_hdr=on"); 1818 return -EINVAL; 1819 } 1820 1821 return 0; 1822 } 1823 1824 static int virtio_net_vnet_pre_save(void *opaque) 1825 { 1826 struct VirtIONetMigTmp *tmp = opaque; 1827 1828 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 1829 1830 return 0; 1831 } 1832 1833 static const VMStateDescription vmstate_virtio_net_has_vnet = { 1834 .name = "virtio-net-vnet", 1835 .post_load = virtio_net_vnet_post_load, 1836 .pre_save = virtio_net_vnet_pre_save, 1837 .fields = (VMStateField[]) { 1838 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 1839 VMSTATE_END_OF_LIST() 1840 }, 1841 }; 1842 1843 static const VMStateDescription vmstate_virtio_net_device = { 1844 .name = "virtio-net-device", 1845 .version_id = VIRTIO_NET_VM_VERSION, 1846 .minimum_version_id = VIRTIO_NET_VM_VERSION, 1847 .post_load = virtio_net_post_load_device, 1848 .fields = (VMStateField[]) { 1849 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 1850 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 1851 vmstate_virtio_net_queue_tx_waiting, 1852 VirtIONetQueue), 1853 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 1854 VMSTATE_UINT16(status, VirtIONet), 1855 VMSTATE_UINT8(promisc, VirtIONet), 1856 VMSTATE_UINT8(allmulti, VirtIONet), 1857 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 1858 1859 /* Guarded pair: If it fits we load it, else we throw it away 1860 * - can happen if source has a larger MAC table.; post-load 1861 * sets flags in this case. 1862 */ 1863 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 1864 0, mac_table_fits, mac_table.in_use, 1865 ETH_ALEN), 1866 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 1867 mac_table.in_use, ETH_ALEN), 1868 1869 /* Note: This is an array of uint32's that's always been saved as a 1870 * buffer; hold onto your endiannesses; it's actually used as a bitmap 1871 * but based on the uint. 1872 */ 1873 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 1874 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1875 vmstate_virtio_net_has_vnet), 1876 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 1877 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 1878 VMSTATE_UINT8(alluni, VirtIONet), 1879 VMSTATE_UINT8(nomulti, VirtIONet), 1880 VMSTATE_UINT8(nouni, VirtIONet), 1881 VMSTATE_UINT8(nobcast, VirtIONet), 1882 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1883 vmstate_virtio_net_has_ufo), 1884 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0, 1885 vmstate_info_uint16_equal, uint16_t), 1886 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1), 1887 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1888 vmstate_virtio_net_tx_waiting), 1889 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 1890 has_ctrl_guest_offloads), 1891 VMSTATE_END_OF_LIST() 1892 }, 1893 }; 1894 1895 static NetClientInfo net_virtio_info = { 1896 .type = NET_CLIENT_DRIVER_NIC, 1897 .size = sizeof(NICState), 1898 .can_receive = virtio_net_can_receive, 1899 .receive = virtio_net_receive, 1900 .link_status_changed = virtio_net_set_link_status, 1901 .query_rx_filter = virtio_net_query_rxfilter, 1902 }; 1903 1904 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1905 { 1906 VirtIONet *n = VIRTIO_NET(vdev); 1907 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1908 assert(n->vhost_started); 1909 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1910 } 1911 1912 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1913 bool mask) 1914 { 1915 VirtIONet *n = VIRTIO_NET(vdev); 1916 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1917 assert(n->vhost_started); 1918 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1919 vdev, idx, mask); 1920 } 1921 1922 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1923 { 1924 int i, config_size = 0; 1925 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1926 1927 for (i = 0; feature_sizes[i].flags != 0; i++) { 1928 if (host_features & feature_sizes[i].flags) { 1929 config_size = MAX(feature_sizes[i].end, config_size); 1930 } 1931 } 1932 n->config_size = config_size; 1933 } 1934 1935 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1936 const char *type) 1937 { 1938 /* 1939 * The name can be NULL, the netclient name will be type.x. 1940 */ 1941 assert(type != NULL); 1942 1943 g_free(n->netclient_name); 1944 g_free(n->netclient_type); 1945 n->netclient_name = g_strdup(name); 1946 n->netclient_type = g_strdup(type); 1947 } 1948 1949 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1950 { 1951 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1952 VirtIONet *n = VIRTIO_NET(dev); 1953 NetClientState *nc; 1954 int i; 1955 1956 if (n->net_conf.mtu) { 1957 n->host_features |= (1ULL << VIRTIO_NET_F_MTU); 1958 } 1959 1960 if (n->net_conf.duplex_str) { 1961 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) { 1962 n->net_conf.duplex = DUPLEX_HALF; 1963 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) { 1964 n->net_conf.duplex = DUPLEX_FULL; 1965 } else { 1966 error_setg(errp, "'duplex' must be 'half' or 'full'"); 1967 } 1968 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 1969 } else { 1970 n->net_conf.duplex = DUPLEX_UNKNOWN; 1971 } 1972 1973 if (n->net_conf.speed < SPEED_UNKNOWN) { 1974 error_setg(errp, "'speed' must be between 0 and INT_MAX"); 1975 } else if (n->net_conf.speed >= 0) { 1976 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 1977 } 1978 1979 virtio_net_set_config_size(n, n->host_features); 1980 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1981 1982 /* 1983 * We set a lower limit on RX queue size to what it always was. 1984 * Guests that want a smaller ring can always resize it without 1985 * help from us (using virtio 1 and up). 1986 */ 1987 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 1988 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 1989 !is_power_of_2(n->net_conf.rx_queue_size)) { 1990 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 1991 "must be a power of 2 between %d and %d.", 1992 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 1993 VIRTQUEUE_MAX_SIZE); 1994 virtio_cleanup(vdev); 1995 return; 1996 } 1997 1998 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || 1999 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE || 2000 !is_power_of_2(n->net_conf.tx_queue_size)) { 2001 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " 2002 "must be a power of 2 between %d and %d", 2003 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, 2004 VIRTQUEUE_MAX_SIZE); 2005 virtio_cleanup(vdev); 2006 return; 2007 } 2008 2009 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 2010 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 2011 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 2012 "must be a positive integer less than %d.", 2013 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 2014 virtio_cleanup(vdev); 2015 return; 2016 } 2017 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 2018 n->curr_queues = 1; 2019 n->tx_timeout = n->net_conf.txtimer; 2020 2021 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 2022 && strcmp(n->net_conf.tx, "bh")) { 2023 error_report("virtio-net: " 2024 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 2025 n->net_conf.tx); 2026 error_report("Defaulting to \"bh\""); 2027 } 2028 2029 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), 2030 n->net_conf.tx_queue_size); 2031 2032 for (i = 0; i < n->max_queues; i++) { 2033 virtio_net_add_queue(n, i); 2034 } 2035 2036 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 2037 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 2038 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 2039 n->status = VIRTIO_NET_S_LINK_UP; 2040 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 2041 virtio_net_announce_timer, n); 2042 2043 if (n->netclient_type) { 2044 /* 2045 * Happen when virtio_net_set_netclient_name has been called. 2046 */ 2047 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 2048 n->netclient_type, n->netclient_name, n); 2049 } else { 2050 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 2051 object_get_typename(OBJECT(dev)), dev->id, n); 2052 } 2053 2054 peer_test_vnet_hdr(n); 2055 if (peer_has_vnet_hdr(n)) { 2056 for (i = 0; i < n->max_queues; i++) { 2057 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 2058 } 2059 n->host_hdr_len = sizeof(struct virtio_net_hdr); 2060 } else { 2061 n->host_hdr_len = 0; 2062 } 2063 2064 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 2065 2066 n->vqs[0].tx_waiting = 0; 2067 n->tx_burst = n->net_conf.txburst; 2068 virtio_net_set_mrg_rx_bufs(n, 0, 0); 2069 n->promisc = 1; /* for compatibility */ 2070 2071 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 2072 2073 n->vlans = g_malloc0(MAX_VLAN >> 3); 2074 2075 nc = qemu_get_queue(n->nic); 2076 nc->rxfilter_notify_enabled = 1; 2077 2078 n->qdev = dev; 2079 } 2080 2081 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 2082 { 2083 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 2084 VirtIONet *n = VIRTIO_NET(dev); 2085 int i, max_queues; 2086 2087 /* This will stop vhost backend if appropriate. */ 2088 virtio_net_set_status(vdev, 0); 2089 2090 g_free(n->netclient_name); 2091 n->netclient_name = NULL; 2092 g_free(n->netclient_type); 2093 n->netclient_type = NULL; 2094 2095 g_free(n->mac_table.macs); 2096 g_free(n->vlans); 2097 2098 max_queues = n->multiqueue ? n->max_queues : 1; 2099 for (i = 0; i < max_queues; i++) { 2100 virtio_net_del_queue(n, i); 2101 } 2102 2103 timer_del(n->announce_timer); 2104 timer_free(n->announce_timer); 2105 g_free(n->vqs); 2106 qemu_del_nic(n->nic); 2107 virtio_cleanup(vdev); 2108 } 2109 2110 static void virtio_net_instance_init(Object *obj) 2111 { 2112 VirtIONet *n = VIRTIO_NET(obj); 2113 2114 /* 2115 * The default config_size is sizeof(struct virtio_net_config). 2116 * Can be overriden with virtio_net_set_config_size. 2117 */ 2118 n->config_size = sizeof(struct virtio_net_config); 2119 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 2120 "bootindex", "/ethernet-phy@0", 2121 DEVICE(n), NULL); 2122 } 2123 2124 static int virtio_net_pre_save(void *opaque) 2125 { 2126 VirtIONet *n = opaque; 2127 2128 /* At this point, backend must be stopped, otherwise 2129 * it might keep writing to memory. */ 2130 assert(!n->vhost_started); 2131 2132 return 0; 2133 } 2134 2135 static const VMStateDescription vmstate_virtio_net = { 2136 .name = "virtio-net", 2137 .minimum_version_id = VIRTIO_NET_VM_VERSION, 2138 .version_id = VIRTIO_NET_VM_VERSION, 2139 .fields = (VMStateField[]) { 2140 VMSTATE_VIRTIO_DEVICE, 2141 VMSTATE_END_OF_LIST() 2142 }, 2143 .pre_save = virtio_net_pre_save, 2144 }; 2145 2146 static Property virtio_net_properties[] = { 2147 DEFINE_PROP_BIT64("csum", VirtIONet, host_features, 2148 VIRTIO_NET_F_CSUM, true), 2149 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features, 2150 VIRTIO_NET_F_GUEST_CSUM, true), 2151 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 2152 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features, 2153 VIRTIO_NET_F_GUEST_TSO4, true), 2154 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features, 2155 VIRTIO_NET_F_GUEST_TSO6, true), 2156 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features, 2157 VIRTIO_NET_F_GUEST_ECN, true), 2158 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features, 2159 VIRTIO_NET_F_GUEST_UFO, true), 2160 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features, 2161 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 2162 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features, 2163 VIRTIO_NET_F_HOST_TSO4, true), 2164 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features, 2165 VIRTIO_NET_F_HOST_TSO6, true), 2166 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features, 2167 VIRTIO_NET_F_HOST_ECN, true), 2168 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features, 2169 VIRTIO_NET_F_HOST_UFO, true), 2170 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features, 2171 VIRTIO_NET_F_MRG_RXBUF, true), 2172 DEFINE_PROP_BIT64("status", VirtIONet, host_features, 2173 VIRTIO_NET_F_STATUS, true), 2174 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features, 2175 VIRTIO_NET_F_CTRL_VQ, true), 2176 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features, 2177 VIRTIO_NET_F_CTRL_RX, true), 2178 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features, 2179 VIRTIO_NET_F_CTRL_VLAN, true), 2180 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features, 2181 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 2182 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features, 2183 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 2184 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features, 2185 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 2186 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 2187 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 2188 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 2189 TX_TIMER_INTERVAL), 2190 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 2191 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 2192 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 2193 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 2194 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 2195 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), 2196 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 2197 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 2198 true), 2199 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN), 2200 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str), 2201 DEFINE_PROP_END_OF_LIST(), 2202 }; 2203 2204 static void virtio_net_class_init(ObjectClass *klass, void *data) 2205 { 2206 DeviceClass *dc = DEVICE_CLASS(klass); 2207 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 2208 2209 dc->props = virtio_net_properties; 2210 dc->vmsd = &vmstate_virtio_net; 2211 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 2212 vdc->realize = virtio_net_device_realize; 2213 vdc->unrealize = virtio_net_device_unrealize; 2214 vdc->get_config = virtio_net_get_config; 2215 vdc->set_config = virtio_net_set_config; 2216 vdc->get_features = virtio_net_get_features; 2217 vdc->set_features = virtio_net_set_features; 2218 vdc->bad_features = virtio_net_bad_features; 2219 vdc->reset = virtio_net_reset; 2220 vdc->set_status = virtio_net_set_status; 2221 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 2222 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 2223 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 2224 vdc->vmsd = &vmstate_virtio_net_device; 2225 } 2226 2227 static const TypeInfo virtio_net_info = { 2228 .name = TYPE_VIRTIO_NET, 2229 .parent = TYPE_VIRTIO_DEVICE, 2230 .instance_size = sizeof(VirtIONet), 2231 .instance_init = virtio_net_instance_init, 2232 .class_init = virtio_net_class_init, 2233 }; 2234 2235 static void virtio_register_types(void) 2236 { 2237 type_register_static(&virtio_net_info); 2238 } 2239 2240 type_init(virtio_register_types) 2241