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