1 /* 2 * Virtio Network Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/iov.h" 16 #include "hw/virtio/virtio.h" 17 #include "net/net.h" 18 #include "net/checksum.h" 19 #include "net/tap.h" 20 #include "qemu/error-report.h" 21 #include "qemu/timer.h" 22 #include "hw/virtio/virtio-net.h" 23 #include "net/vhost_net.h" 24 #include "hw/virtio/virtio-bus.h" 25 #include "qapi/qmp/qjson.h" 26 #include "qapi-event.h" 27 #include "hw/virtio/virtio-access.h" 28 #include "migration/misc.h" 29 30 #define VIRTIO_NET_VM_VERSION 11 31 32 #define MAC_TABLE_ENTRIES 64 33 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 34 35 /* previously fixed value */ 36 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 37 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256 38 39 /* for now, only allow larger queues; with virtio-1, guest can downsize */ 40 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 41 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 42 43 /* 44 * Calculate the number of bytes up to and including the given 'field' of 45 * 'container'. 46 */ 47 #define endof(container, field) \ 48 (offsetof(container, field) + sizeof(((container *)0)->field)) 49 50 typedef struct VirtIOFeature { 51 uint32_t flags; 52 size_t end; 53 } VirtIOFeature; 54 55 static VirtIOFeature feature_sizes[] = { 56 {.flags = 1 << VIRTIO_NET_F_MAC, 57 .end = endof(struct virtio_net_config, mac)}, 58 {.flags = 1 << VIRTIO_NET_F_STATUS, 59 .end = endof(struct virtio_net_config, status)}, 60 {.flags = 1 << VIRTIO_NET_F_MQ, 61 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 62 {.flags = 1 << VIRTIO_NET_F_MTU, 63 .end = endof(struct virtio_net_config, mtu)}, 64 {} 65 }; 66 67 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 68 { 69 VirtIONet *n = qemu_get_nic_opaque(nc); 70 71 return &n->vqs[nc->queue_index]; 72 } 73 74 static int vq2q(int queue_index) 75 { 76 return queue_index / 2; 77 } 78 79 /* TODO 80 * - we could suppress RX interrupt if we were so inclined. 81 */ 82 83 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 84 { 85 VirtIONet *n = VIRTIO_NET(vdev); 86 struct virtio_net_config netcfg; 87 88 virtio_stw_p(vdev, &netcfg.status, n->status); 89 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 90 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); 91 memcpy(netcfg.mac, n->mac, ETH_ALEN); 92 memcpy(config, &netcfg, n->config_size); 93 } 94 95 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 96 { 97 VirtIONet *n = VIRTIO_NET(vdev); 98 struct virtio_net_config netcfg = {}; 99 100 memcpy(&netcfg, config, n->config_size); 101 102 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 103 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 104 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 105 memcpy(n->mac, netcfg.mac, ETH_ALEN); 106 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 107 } 108 } 109 110 static bool virtio_net_started(VirtIONet *n, uint8_t status) 111 { 112 VirtIODevice *vdev = VIRTIO_DEVICE(n); 113 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 114 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 115 } 116 117 static void virtio_net_announce_timer(void *opaque) 118 { 119 VirtIONet *n = opaque; 120 VirtIODevice *vdev = VIRTIO_DEVICE(n); 121 122 n->announce_counter--; 123 n->status |= VIRTIO_NET_S_ANNOUNCE; 124 virtio_notify_config(vdev); 125 } 126 127 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 128 { 129 VirtIODevice *vdev = VIRTIO_DEVICE(n); 130 NetClientState *nc = qemu_get_queue(n->nic); 131 int queues = n->multiqueue ? n->max_queues : 1; 132 133 if (!get_vhost_net(nc->peer)) { 134 return; 135 } 136 137 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 138 !!n->vhost_started) { 139 return; 140 } 141 if (!n->vhost_started) { 142 int r, i; 143 144 if (n->needs_vnet_hdr_swap) { 145 error_report("backend does not support %s vnet headers; " 146 "falling back on userspace virtio", 147 virtio_is_big_endian(vdev) ? "BE" : "LE"); 148 return; 149 } 150 151 /* Any packets outstanding? Purge them to avoid touching rings 152 * when vhost is running. 153 */ 154 for (i = 0; i < queues; i++) { 155 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 156 157 /* Purge both directions: TX and RX. */ 158 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 159 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 160 } 161 162 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { 163 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); 164 if (r < 0) { 165 error_report("%uBytes MTU not supported by the backend", 166 n->net_conf.mtu); 167 168 return; 169 } 170 } 171 172 n->vhost_started = 1; 173 r = vhost_net_start(vdev, n->nic->ncs, queues); 174 if (r < 0) { 175 error_report("unable to start vhost net: %d: " 176 "falling back on userspace virtio", -r); 177 n->vhost_started = 0; 178 } 179 } else { 180 vhost_net_stop(vdev, n->nic->ncs, queues); 181 n->vhost_started = 0; 182 } 183 } 184 185 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 186 NetClientState *peer, 187 bool enable) 188 { 189 if (virtio_is_big_endian(vdev)) { 190 return qemu_set_vnet_be(peer, enable); 191 } else { 192 return qemu_set_vnet_le(peer, enable); 193 } 194 } 195 196 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 197 int queues, bool enable) 198 { 199 int i; 200 201 for (i = 0; i < queues; i++) { 202 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 203 enable) { 204 while (--i >= 0) { 205 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 206 } 207 208 return true; 209 } 210 } 211 212 return false; 213 } 214 215 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 216 { 217 VirtIODevice *vdev = VIRTIO_DEVICE(n); 218 int queues = n->multiqueue ? n->max_queues : 1; 219 220 if (virtio_net_started(n, status)) { 221 /* Before using the device, we tell the network backend about the 222 * endianness to use when parsing vnet headers. If the backend 223 * can't do it, we fallback onto fixing the headers in the core 224 * virtio-net code. 225 */ 226 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, 227 queues, true); 228 } else if (virtio_net_started(n, vdev->status)) { 229 /* After using the device, we need to reset the network backend to 230 * the default (guest native endianness), otherwise the guest may 231 * lose network connectivity if it is rebooted into a different 232 * endianness. 233 */ 234 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); 235 } 236 } 237 238 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) 239 { 240 unsigned int dropped = virtqueue_drop_all(vq); 241 if (dropped) { 242 virtio_notify(vdev, vq); 243 } 244 } 245 246 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 247 { 248 VirtIONet *n = VIRTIO_NET(vdev); 249 VirtIONetQueue *q; 250 int i; 251 uint8_t queue_status; 252 253 virtio_net_vnet_endian_status(n, status); 254 virtio_net_vhost_status(n, status); 255 256 for (i = 0; i < n->max_queues; i++) { 257 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 258 bool queue_started; 259 q = &n->vqs[i]; 260 261 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 262 queue_status = 0; 263 } else { 264 queue_status = status; 265 } 266 queue_started = 267 virtio_net_started(n, queue_status) && !n->vhost_started; 268 269 if (queue_started) { 270 qemu_flush_queued_packets(ncs); 271 } 272 273 if (!q->tx_waiting) { 274 continue; 275 } 276 277 if (queue_started) { 278 if (q->tx_timer) { 279 timer_mod(q->tx_timer, 280 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 281 } else { 282 qemu_bh_schedule(q->tx_bh); 283 } 284 } else { 285 if (q->tx_timer) { 286 timer_del(q->tx_timer); 287 } else { 288 qemu_bh_cancel(q->tx_bh); 289 } 290 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && 291 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) && 292 vdev->vm_running) { 293 /* if tx is waiting we are likely have some packets in tx queue 294 * and disabled notification */ 295 q->tx_waiting = 0; 296 virtio_queue_set_notification(q->tx_vq, 1); 297 virtio_net_drop_tx_queue_data(vdev, q->tx_vq); 298 } 299 } 300 } 301 } 302 303 static void virtio_net_set_link_status(NetClientState *nc) 304 { 305 VirtIONet *n = qemu_get_nic_opaque(nc); 306 VirtIODevice *vdev = VIRTIO_DEVICE(n); 307 uint16_t old_status = n->status; 308 309 if (nc->link_down) 310 n->status &= ~VIRTIO_NET_S_LINK_UP; 311 else 312 n->status |= VIRTIO_NET_S_LINK_UP; 313 314 if (n->status != old_status) 315 virtio_notify_config(vdev); 316 317 virtio_net_set_status(vdev, vdev->status); 318 } 319 320 static void rxfilter_notify(NetClientState *nc) 321 { 322 VirtIONet *n = qemu_get_nic_opaque(nc); 323 324 if (nc->rxfilter_notify_enabled) { 325 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 326 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 327 n->netclient_name, path, &error_abort); 328 g_free(path); 329 330 /* disable event notification to avoid events flooding */ 331 nc->rxfilter_notify_enabled = 0; 332 } 333 } 334 335 static intList *get_vlan_table(VirtIONet *n) 336 { 337 intList *list, *entry; 338 int i, j; 339 340 list = NULL; 341 for (i = 0; i < MAX_VLAN >> 5; i++) { 342 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 343 if (n->vlans[i] & (1U << j)) { 344 entry = g_malloc0(sizeof(*entry)); 345 entry->value = (i << 5) + j; 346 entry->next = list; 347 list = entry; 348 } 349 } 350 } 351 352 return list; 353 } 354 355 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 356 { 357 VirtIONet *n = qemu_get_nic_opaque(nc); 358 VirtIODevice *vdev = VIRTIO_DEVICE(n); 359 RxFilterInfo *info; 360 strList *str_list, *entry; 361 int i; 362 363 info = g_malloc0(sizeof(*info)); 364 info->name = g_strdup(nc->name); 365 info->promiscuous = n->promisc; 366 367 if (n->nouni) { 368 info->unicast = RX_STATE_NONE; 369 } else if (n->alluni) { 370 info->unicast = RX_STATE_ALL; 371 } else { 372 info->unicast = RX_STATE_NORMAL; 373 } 374 375 if (n->nomulti) { 376 info->multicast = RX_STATE_NONE; 377 } else if (n->allmulti) { 378 info->multicast = RX_STATE_ALL; 379 } else { 380 info->multicast = RX_STATE_NORMAL; 381 } 382 383 info->broadcast_allowed = n->nobcast; 384 info->multicast_overflow = n->mac_table.multi_overflow; 385 info->unicast_overflow = n->mac_table.uni_overflow; 386 387 info->main_mac = qemu_mac_strdup_printf(n->mac); 388 389 str_list = NULL; 390 for (i = 0; i < n->mac_table.first_multi; i++) { 391 entry = g_malloc0(sizeof(*entry)); 392 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 393 entry->next = str_list; 394 str_list = entry; 395 } 396 info->unicast_table = str_list; 397 398 str_list = NULL; 399 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 400 entry = g_malloc0(sizeof(*entry)); 401 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 402 entry->next = str_list; 403 str_list = entry; 404 } 405 info->multicast_table = str_list; 406 info->vlan_table = get_vlan_table(n); 407 408 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 409 info->vlan = RX_STATE_ALL; 410 } else if (!info->vlan_table) { 411 info->vlan = RX_STATE_NONE; 412 } else { 413 info->vlan = RX_STATE_NORMAL; 414 } 415 416 /* enable event notification after query */ 417 nc->rxfilter_notify_enabled = 1; 418 419 return info; 420 } 421 422 static void virtio_net_reset(VirtIODevice *vdev) 423 { 424 VirtIONet *n = VIRTIO_NET(vdev); 425 426 /* Reset back to compatibility mode */ 427 n->promisc = 1; 428 n->allmulti = 0; 429 n->alluni = 0; 430 n->nomulti = 0; 431 n->nouni = 0; 432 n->nobcast = 0; 433 /* multiqueue is disabled by default */ 434 n->curr_queues = 1; 435 timer_del(n->announce_timer); 436 n->announce_counter = 0; 437 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 438 439 /* Flush any MAC and VLAN filter table state */ 440 n->mac_table.in_use = 0; 441 n->mac_table.first_multi = 0; 442 n->mac_table.multi_overflow = 0; 443 n->mac_table.uni_overflow = 0; 444 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 445 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 446 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 447 memset(n->vlans, 0, MAX_VLAN >> 3); 448 } 449 450 static void peer_test_vnet_hdr(VirtIONet *n) 451 { 452 NetClientState *nc = qemu_get_queue(n->nic); 453 if (!nc->peer) { 454 return; 455 } 456 457 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 458 } 459 460 static int peer_has_vnet_hdr(VirtIONet *n) 461 { 462 return n->has_vnet_hdr; 463 } 464 465 static int peer_has_ufo(VirtIONet *n) 466 { 467 if (!peer_has_vnet_hdr(n)) 468 return 0; 469 470 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 471 472 return n->has_ufo; 473 } 474 475 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 476 int version_1) 477 { 478 int i; 479 NetClientState *nc; 480 481 n->mergeable_rx_bufs = mergeable_rx_bufs; 482 483 if (version_1) { 484 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 485 } else { 486 n->guest_hdr_len = n->mergeable_rx_bufs ? 487 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 488 sizeof(struct virtio_net_hdr); 489 } 490 491 for (i = 0; i < n->max_queues; i++) { 492 nc = qemu_get_subqueue(n->nic, i); 493 494 if (peer_has_vnet_hdr(n) && 495 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 496 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 497 n->host_hdr_len = n->guest_hdr_len; 498 } 499 } 500 } 501 502 static int virtio_net_max_tx_queue_size(VirtIONet *n) 503 { 504 NetClientState *peer = n->nic_conf.peers.ncs[0]; 505 506 /* 507 * Backends other than vhost-user don't support max queue size. 508 */ 509 if (!peer) { 510 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 511 } 512 513 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) { 514 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 515 } 516 517 return VIRTQUEUE_MAX_SIZE; 518 } 519 520 static int peer_attach(VirtIONet *n, int index) 521 { 522 NetClientState *nc = qemu_get_subqueue(n->nic, index); 523 524 if (!nc->peer) { 525 return 0; 526 } 527 528 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 529 vhost_set_vring_enable(nc->peer, 1); 530 } 531 532 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 533 return 0; 534 } 535 536 if (n->max_queues == 1) { 537 return 0; 538 } 539 540 return tap_enable(nc->peer); 541 } 542 543 static int peer_detach(VirtIONet *n, int index) 544 { 545 NetClientState *nc = qemu_get_subqueue(n->nic, index); 546 547 if (!nc->peer) { 548 return 0; 549 } 550 551 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 552 vhost_set_vring_enable(nc->peer, 0); 553 } 554 555 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 556 return 0; 557 } 558 559 return tap_disable(nc->peer); 560 } 561 562 static void virtio_net_set_queues(VirtIONet *n) 563 { 564 int i; 565 int r; 566 567 if (n->nic->peer_deleted) { 568 return; 569 } 570 571 for (i = 0; i < n->max_queues; i++) { 572 if (i < n->curr_queues) { 573 r = peer_attach(n, i); 574 assert(!r); 575 } else { 576 r = peer_detach(n, i); 577 assert(!r); 578 } 579 } 580 } 581 582 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 583 584 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 585 Error **errp) 586 { 587 VirtIONet *n = VIRTIO_NET(vdev); 588 NetClientState *nc = qemu_get_queue(n->nic); 589 590 /* Firstly sync all virtio-net possible supported features */ 591 features |= n->host_features; 592 593 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 594 595 if (!peer_has_vnet_hdr(n)) { 596 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 597 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 598 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 599 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 600 601 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 602 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 603 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 604 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 605 } 606 607 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 608 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 609 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 610 } 611 612 if (!get_vhost_net(nc->peer)) { 613 return features; 614 } 615 features = vhost_net_get_features(get_vhost_net(nc->peer), features); 616 vdev->backend_features = features; 617 618 if (n->mtu_bypass_backend && 619 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { 620 features |= (1ULL << VIRTIO_NET_F_MTU); 621 } 622 623 return features; 624 } 625 626 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 627 { 628 uint64_t features = 0; 629 630 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 631 * but also these: */ 632 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 633 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 634 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 635 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 636 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 637 638 return features; 639 } 640 641 static void virtio_net_apply_guest_offloads(VirtIONet *n) 642 { 643 qemu_set_offload(qemu_get_queue(n->nic)->peer, 644 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 645 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 646 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 647 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 648 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 649 } 650 651 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 652 { 653 static const uint64_t guest_offloads_mask = 654 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 655 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 656 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 657 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 658 (1ULL << VIRTIO_NET_F_GUEST_UFO); 659 660 return guest_offloads_mask & features; 661 } 662 663 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 664 { 665 VirtIODevice *vdev = VIRTIO_DEVICE(n); 666 return virtio_net_guest_offloads_by_features(vdev->guest_features); 667 } 668 669 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 670 { 671 VirtIONet *n = VIRTIO_NET(vdev); 672 int i; 673 674 if (n->mtu_bypass_backend && 675 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { 676 features &= ~(1ULL << VIRTIO_NET_F_MTU); 677 } 678 679 virtio_net_set_multiqueue(n, 680 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 681 682 virtio_net_set_mrg_rx_bufs(n, 683 virtio_has_feature(features, 684 VIRTIO_NET_F_MRG_RXBUF), 685 virtio_has_feature(features, 686 VIRTIO_F_VERSION_1)); 687 688 if (n->has_vnet_hdr) { 689 n->curr_guest_offloads = 690 virtio_net_guest_offloads_by_features(features); 691 virtio_net_apply_guest_offloads(n); 692 } 693 694 for (i = 0; i < n->max_queues; i++) { 695 NetClientState *nc = qemu_get_subqueue(n->nic, i); 696 697 if (!get_vhost_net(nc->peer)) { 698 continue; 699 } 700 vhost_net_ack_features(get_vhost_net(nc->peer), features); 701 } 702 703 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 704 memset(n->vlans, 0, MAX_VLAN >> 3); 705 } else { 706 memset(n->vlans, 0xff, MAX_VLAN >> 3); 707 } 708 } 709 710 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 711 struct iovec *iov, unsigned int iov_cnt) 712 { 713 uint8_t on; 714 size_t s; 715 NetClientState *nc = qemu_get_queue(n->nic); 716 717 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 718 if (s != sizeof(on)) { 719 return VIRTIO_NET_ERR; 720 } 721 722 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 723 n->promisc = on; 724 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 725 n->allmulti = on; 726 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 727 n->alluni = on; 728 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 729 n->nomulti = on; 730 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 731 n->nouni = on; 732 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 733 n->nobcast = on; 734 } else { 735 return VIRTIO_NET_ERR; 736 } 737 738 rxfilter_notify(nc); 739 740 return VIRTIO_NET_OK; 741 } 742 743 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 744 struct iovec *iov, unsigned int iov_cnt) 745 { 746 VirtIODevice *vdev = VIRTIO_DEVICE(n); 747 uint64_t offloads; 748 size_t s; 749 750 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 751 return VIRTIO_NET_ERR; 752 } 753 754 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 755 if (s != sizeof(offloads)) { 756 return VIRTIO_NET_ERR; 757 } 758 759 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 760 uint64_t supported_offloads; 761 762 offloads = virtio_ldq_p(vdev, &offloads); 763 764 if (!n->has_vnet_hdr) { 765 return VIRTIO_NET_ERR; 766 } 767 768 supported_offloads = virtio_net_supported_guest_offloads(n); 769 if (offloads & ~supported_offloads) { 770 return VIRTIO_NET_ERR; 771 } 772 773 n->curr_guest_offloads = offloads; 774 virtio_net_apply_guest_offloads(n); 775 776 return VIRTIO_NET_OK; 777 } else { 778 return VIRTIO_NET_ERR; 779 } 780 } 781 782 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 783 struct iovec *iov, unsigned int iov_cnt) 784 { 785 VirtIODevice *vdev = VIRTIO_DEVICE(n); 786 struct virtio_net_ctrl_mac mac_data; 787 size_t s; 788 NetClientState *nc = qemu_get_queue(n->nic); 789 790 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 791 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 792 return VIRTIO_NET_ERR; 793 } 794 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 795 assert(s == sizeof(n->mac)); 796 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 797 rxfilter_notify(nc); 798 799 return VIRTIO_NET_OK; 800 } 801 802 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 803 return VIRTIO_NET_ERR; 804 } 805 806 int in_use = 0; 807 int first_multi = 0; 808 uint8_t uni_overflow = 0; 809 uint8_t multi_overflow = 0; 810 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 811 812 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 813 sizeof(mac_data.entries)); 814 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 815 if (s != sizeof(mac_data.entries)) { 816 goto error; 817 } 818 iov_discard_front(&iov, &iov_cnt, s); 819 820 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 821 goto error; 822 } 823 824 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 825 s = iov_to_buf(iov, iov_cnt, 0, macs, 826 mac_data.entries * ETH_ALEN); 827 if (s != mac_data.entries * ETH_ALEN) { 828 goto error; 829 } 830 in_use += mac_data.entries; 831 } else { 832 uni_overflow = 1; 833 } 834 835 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 836 837 first_multi = in_use; 838 839 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 840 sizeof(mac_data.entries)); 841 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 842 if (s != sizeof(mac_data.entries)) { 843 goto error; 844 } 845 846 iov_discard_front(&iov, &iov_cnt, s); 847 848 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 849 goto error; 850 } 851 852 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 853 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 854 mac_data.entries * ETH_ALEN); 855 if (s != mac_data.entries * ETH_ALEN) { 856 goto error; 857 } 858 in_use += mac_data.entries; 859 } else { 860 multi_overflow = 1; 861 } 862 863 n->mac_table.in_use = in_use; 864 n->mac_table.first_multi = first_multi; 865 n->mac_table.uni_overflow = uni_overflow; 866 n->mac_table.multi_overflow = multi_overflow; 867 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 868 g_free(macs); 869 rxfilter_notify(nc); 870 871 return VIRTIO_NET_OK; 872 873 error: 874 g_free(macs); 875 return VIRTIO_NET_ERR; 876 } 877 878 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 879 struct iovec *iov, unsigned int iov_cnt) 880 { 881 VirtIODevice *vdev = VIRTIO_DEVICE(n); 882 uint16_t vid; 883 size_t s; 884 NetClientState *nc = qemu_get_queue(n->nic); 885 886 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 887 vid = virtio_lduw_p(vdev, &vid); 888 if (s != sizeof(vid)) { 889 return VIRTIO_NET_ERR; 890 } 891 892 if (vid >= MAX_VLAN) 893 return VIRTIO_NET_ERR; 894 895 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 896 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 897 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 898 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 899 else 900 return VIRTIO_NET_ERR; 901 902 rxfilter_notify(nc); 903 904 return VIRTIO_NET_OK; 905 } 906 907 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 908 struct iovec *iov, unsigned int iov_cnt) 909 { 910 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 911 n->status & VIRTIO_NET_S_ANNOUNCE) { 912 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 913 if (n->announce_counter) { 914 timer_mod(n->announce_timer, 915 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 916 self_announce_delay(n->announce_counter)); 917 } 918 return VIRTIO_NET_OK; 919 } else { 920 return VIRTIO_NET_ERR; 921 } 922 } 923 924 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 925 struct iovec *iov, unsigned int iov_cnt) 926 { 927 VirtIODevice *vdev = VIRTIO_DEVICE(n); 928 struct virtio_net_ctrl_mq mq; 929 size_t s; 930 uint16_t queues; 931 932 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 933 if (s != sizeof(mq)) { 934 return VIRTIO_NET_ERR; 935 } 936 937 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 938 return VIRTIO_NET_ERR; 939 } 940 941 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 942 943 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 944 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 945 queues > n->max_queues || 946 !n->multiqueue) { 947 return VIRTIO_NET_ERR; 948 } 949 950 n->curr_queues = queues; 951 /* stop the backend before changing the number of queues to avoid handling a 952 * disabled queue */ 953 virtio_net_set_status(vdev, vdev->status); 954 virtio_net_set_queues(n); 955 956 return VIRTIO_NET_OK; 957 } 958 959 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 960 { 961 VirtIONet *n = VIRTIO_NET(vdev); 962 struct virtio_net_ctrl_hdr ctrl; 963 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 964 VirtQueueElement *elem; 965 size_t s; 966 struct iovec *iov, *iov2; 967 unsigned int iov_cnt; 968 969 for (;;) { 970 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 971 if (!elem) { 972 break; 973 } 974 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || 975 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { 976 virtio_error(vdev, "virtio-net ctrl missing headers"); 977 virtqueue_detach_element(vq, elem, 0); 978 g_free(elem); 979 break; 980 } 981 982 iov_cnt = elem->out_num; 983 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); 984 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 985 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 986 if (s != sizeof(ctrl)) { 987 status = VIRTIO_NET_ERR; 988 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 989 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 990 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 991 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 992 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 993 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 994 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 995 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 996 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 997 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 998 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 999 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 1000 } 1001 1002 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); 1003 assert(s == sizeof(status)); 1004 1005 virtqueue_push(vq, elem, sizeof(status)); 1006 virtio_notify(vdev, vq); 1007 g_free(iov2); 1008 g_free(elem); 1009 } 1010 } 1011 1012 /* RX */ 1013 1014 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 1015 { 1016 VirtIONet *n = VIRTIO_NET(vdev); 1017 int queue_index = vq2q(virtio_get_queue_index(vq)); 1018 1019 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 1020 } 1021 1022 static int virtio_net_can_receive(NetClientState *nc) 1023 { 1024 VirtIONet *n = qemu_get_nic_opaque(nc); 1025 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1026 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1027 1028 if (!vdev->vm_running) { 1029 return 0; 1030 } 1031 1032 if (nc->queue_index >= n->curr_queues) { 1033 return 0; 1034 } 1035 1036 if (!virtio_queue_ready(q->rx_vq) || 1037 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1038 return 0; 1039 } 1040 1041 return 1; 1042 } 1043 1044 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1045 { 1046 VirtIONet *n = q->n; 1047 if (virtio_queue_empty(q->rx_vq) || 1048 (n->mergeable_rx_bufs && 1049 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1050 virtio_queue_set_notification(q->rx_vq, 1); 1051 1052 /* To avoid a race condition where the guest has made some buffers 1053 * available after the above check but before notification was 1054 * enabled, check for available buffers again. 1055 */ 1056 if (virtio_queue_empty(q->rx_vq) || 1057 (n->mergeable_rx_bufs && 1058 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1059 return 0; 1060 } 1061 } 1062 1063 virtio_queue_set_notification(q->rx_vq, 0); 1064 return 1; 1065 } 1066 1067 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1068 { 1069 virtio_tswap16s(vdev, &hdr->hdr_len); 1070 virtio_tswap16s(vdev, &hdr->gso_size); 1071 virtio_tswap16s(vdev, &hdr->csum_start); 1072 virtio_tswap16s(vdev, &hdr->csum_offset); 1073 } 1074 1075 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1076 * it never finds out that the packets don't have valid checksums. This 1077 * causes dhclient to get upset. Fedora's carried a patch for ages to 1078 * fix this with Xen but it hasn't appeared in an upstream release of 1079 * dhclient yet. 1080 * 1081 * To avoid breaking existing guests, we catch udp packets and add 1082 * checksums. This is terrible but it's better than hacking the guest 1083 * kernels. 1084 * 1085 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1086 * we should provide a mechanism to disable it to avoid polluting the host 1087 * cache. 1088 */ 1089 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1090 uint8_t *buf, size_t size) 1091 { 1092 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1093 (size > 27 && size < 1500) && /* normal sized MTU */ 1094 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1095 (buf[23] == 17) && /* ip.protocol == UDP */ 1096 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1097 net_checksum_calculate(buf, size); 1098 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1099 } 1100 } 1101 1102 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1103 const void *buf, size_t size) 1104 { 1105 if (n->has_vnet_hdr) { 1106 /* FIXME this cast is evil */ 1107 void *wbuf = (void *)buf; 1108 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1109 size - n->host_hdr_len); 1110 1111 if (n->needs_vnet_hdr_swap) { 1112 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1113 } 1114 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1115 } else { 1116 struct virtio_net_hdr hdr = { 1117 .flags = 0, 1118 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1119 }; 1120 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1121 } 1122 } 1123 1124 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1125 { 1126 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1127 static const uint8_t vlan[] = {0x81, 0x00}; 1128 uint8_t *ptr = (uint8_t *)buf; 1129 int i; 1130 1131 if (n->promisc) 1132 return 1; 1133 1134 ptr += n->host_hdr_len; 1135 1136 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1137 int vid = lduw_be_p(ptr + 14) & 0xfff; 1138 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1139 return 0; 1140 } 1141 1142 if (ptr[0] & 1) { // multicast 1143 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1144 return !n->nobcast; 1145 } else if (n->nomulti) { 1146 return 0; 1147 } else if (n->allmulti || n->mac_table.multi_overflow) { 1148 return 1; 1149 } 1150 1151 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1152 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1153 return 1; 1154 } 1155 } 1156 } else { // unicast 1157 if (n->nouni) { 1158 return 0; 1159 } else if (n->alluni || n->mac_table.uni_overflow) { 1160 return 1; 1161 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1162 return 1; 1163 } 1164 1165 for (i = 0; i < n->mac_table.first_multi; i++) { 1166 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1167 return 1; 1168 } 1169 } 1170 } 1171 1172 return 0; 1173 } 1174 1175 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1176 size_t size) 1177 { 1178 VirtIONet *n = qemu_get_nic_opaque(nc); 1179 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1180 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1181 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1182 struct virtio_net_hdr_mrg_rxbuf mhdr; 1183 unsigned mhdr_cnt = 0; 1184 size_t offset, i, guest_offset; 1185 1186 if (!virtio_net_can_receive(nc)) { 1187 return -1; 1188 } 1189 1190 /* hdr_len refers to the header we supply to the guest */ 1191 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1192 return 0; 1193 } 1194 1195 if (!receive_filter(n, buf, size)) 1196 return size; 1197 1198 offset = i = 0; 1199 1200 while (offset < size) { 1201 VirtQueueElement *elem; 1202 int len, total; 1203 const struct iovec *sg; 1204 1205 total = 0; 1206 1207 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1208 if (!elem) { 1209 if (i) { 1210 virtio_error(vdev, "virtio-net unexpected empty queue: " 1211 "i %zd mergeable %d offset %zd, size %zd, " 1212 "guest hdr len %zd, host hdr len %zd " 1213 "guest features 0x%" PRIx64, 1214 i, n->mergeable_rx_bufs, offset, size, 1215 n->guest_hdr_len, n->host_hdr_len, 1216 vdev->guest_features); 1217 } 1218 return -1; 1219 } 1220 1221 if (elem->in_num < 1) { 1222 virtio_error(vdev, 1223 "virtio-net receive queue contains no in buffers"); 1224 virtqueue_detach_element(q->rx_vq, elem, 0); 1225 g_free(elem); 1226 return -1; 1227 } 1228 1229 sg = elem->in_sg; 1230 if (i == 0) { 1231 assert(offset == 0); 1232 if (n->mergeable_rx_bufs) { 1233 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1234 sg, elem->in_num, 1235 offsetof(typeof(mhdr), num_buffers), 1236 sizeof(mhdr.num_buffers)); 1237 } 1238 1239 receive_header(n, sg, elem->in_num, buf, size); 1240 offset = n->host_hdr_len; 1241 total += n->guest_hdr_len; 1242 guest_offset = n->guest_hdr_len; 1243 } else { 1244 guest_offset = 0; 1245 } 1246 1247 /* copy in packet. ugh */ 1248 len = iov_from_buf(sg, elem->in_num, guest_offset, 1249 buf + offset, size - offset); 1250 total += len; 1251 offset += len; 1252 /* If buffers can't be merged, at this point we 1253 * must have consumed the complete packet. 1254 * Otherwise, drop it. */ 1255 if (!n->mergeable_rx_bufs && offset < size) { 1256 virtqueue_unpop(q->rx_vq, elem, total); 1257 g_free(elem); 1258 return size; 1259 } 1260 1261 /* signal other side */ 1262 virtqueue_fill(q->rx_vq, elem, total, i++); 1263 g_free(elem); 1264 } 1265 1266 if (mhdr_cnt) { 1267 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1268 iov_from_buf(mhdr_sg, mhdr_cnt, 1269 0, 1270 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1271 } 1272 1273 virtqueue_flush(q->rx_vq, i); 1274 virtio_notify(vdev, q->rx_vq); 1275 1276 return size; 1277 } 1278 1279 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 1280 size_t size) 1281 { 1282 ssize_t r; 1283 1284 rcu_read_lock(); 1285 r = virtio_net_receive_rcu(nc, buf, size); 1286 rcu_read_unlock(); 1287 return r; 1288 } 1289 1290 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1291 1292 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1293 { 1294 VirtIONet *n = qemu_get_nic_opaque(nc); 1295 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1296 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1297 1298 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 1299 virtio_notify(vdev, q->tx_vq); 1300 1301 g_free(q->async_tx.elem); 1302 q->async_tx.elem = NULL; 1303 1304 virtio_queue_set_notification(q->tx_vq, 1); 1305 virtio_net_flush_tx(q); 1306 } 1307 1308 /* TX */ 1309 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1310 { 1311 VirtIONet *n = q->n; 1312 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1313 VirtQueueElement *elem; 1314 int32_t num_packets = 0; 1315 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1316 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1317 return num_packets; 1318 } 1319 1320 if (q->async_tx.elem) { 1321 virtio_queue_set_notification(q->tx_vq, 0); 1322 return num_packets; 1323 } 1324 1325 for (;;) { 1326 ssize_t ret; 1327 unsigned int out_num; 1328 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 1329 struct virtio_net_hdr_mrg_rxbuf mhdr; 1330 1331 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 1332 if (!elem) { 1333 break; 1334 } 1335 1336 out_num = elem->out_num; 1337 out_sg = elem->out_sg; 1338 if (out_num < 1) { 1339 virtio_error(vdev, "virtio-net header not in first element"); 1340 virtqueue_detach_element(q->tx_vq, elem, 0); 1341 g_free(elem); 1342 return -EINVAL; 1343 } 1344 1345 if (n->has_vnet_hdr) { 1346 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < 1347 n->guest_hdr_len) { 1348 virtio_error(vdev, "virtio-net header incorrect"); 1349 virtqueue_detach_element(q->tx_vq, elem, 0); 1350 g_free(elem); 1351 return -EINVAL; 1352 } 1353 if (n->needs_vnet_hdr_swap) { 1354 virtio_net_hdr_swap(vdev, (void *) &mhdr); 1355 sg2[0].iov_base = &mhdr; 1356 sg2[0].iov_len = n->guest_hdr_len; 1357 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, 1358 out_sg, out_num, 1359 n->guest_hdr_len, -1); 1360 if (out_num == VIRTQUEUE_MAX_SIZE) { 1361 goto drop; 1362 } 1363 out_num += 1; 1364 out_sg = sg2; 1365 } 1366 } 1367 /* 1368 * If host wants to see the guest header as is, we can 1369 * pass it on unchanged. Otherwise, copy just the parts 1370 * that host is interested in. 1371 */ 1372 assert(n->host_hdr_len <= n->guest_hdr_len); 1373 if (n->host_hdr_len != n->guest_hdr_len) { 1374 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1375 out_sg, out_num, 1376 0, n->host_hdr_len); 1377 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1378 out_sg, out_num, 1379 n->guest_hdr_len, -1); 1380 out_num = sg_num; 1381 out_sg = sg; 1382 } 1383 1384 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1385 out_sg, out_num, virtio_net_tx_complete); 1386 if (ret == 0) { 1387 virtio_queue_set_notification(q->tx_vq, 0); 1388 q->async_tx.elem = elem; 1389 return -EBUSY; 1390 } 1391 1392 drop: 1393 virtqueue_push(q->tx_vq, elem, 0); 1394 virtio_notify(vdev, q->tx_vq); 1395 g_free(elem); 1396 1397 if (++num_packets >= n->tx_burst) { 1398 break; 1399 } 1400 } 1401 return num_packets; 1402 } 1403 1404 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1405 { 1406 VirtIONet *n = VIRTIO_NET(vdev); 1407 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1408 1409 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1410 virtio_net_drop_tx_queue_data(vdev, vq); 1411 return; 1412 } 1413 1414 /* This happens when device was stopped but VCPU wasn't. */ 1415 if (!vdev->vm_running) { 1416 q->tx_waiting = 1; 1417 return; 1418 } 1419 1420 if (q->tx_waiting) { 1421 virtio_queue_set_notification(vq, 1); 1422 timer_del(q->tx_timer); 1423 q->tx_waiting = 0; 1424 if (virtio_net_flush_tx(q) == -EINVAL) { 1425 return; 1426 } 1427 } else { 1428 timer_mod(q->tx_timer, 1429 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1430 q->tx_waiting = 1; 1431 virtio_queue_set_notification(vq, 0); 1432 } 1433 } 1434 1435 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1436 { 1437 VirtIONet *n = VIRTIO_NET(vdev); 1438 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1439 1440 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 1441 virtio_net_drop_tx_queue_data(vdev, vq); 1442 return; 1443 } 1444 1445 if (unlikely(q->tx_waiting)) { 1446 return; 1447 } 1448 q->tx_waiting = 1; 1449 /* This happens when device was stopped but VCPU wasn't. */ 1450 if (!vdev->vm_running) { 1451 return; 1452 } 1453 virtio_queue_set_notification(vq, 0); 1454 qemu_bh_schedule(q->tx_bh); 1455 } 1456 1457 static void virtio_net_tx_timer(void *opaque) 1458 { 1459 VirtIONetQueue *q = opaque; 1460 VirtIONet *n = q->n; 1461 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1462 /* This happens when device was stopped but BH wasn't. */ 1463 if (!vdev->vm_running) { 1464 /* Make sure tx waiting is set, so we'll run when restarted. */ 1465 assert(q->tx_waiting); 1466 return; 1467 } 1468 1469 q->tx_waiting = 0; 1470 1471 /* Just in case the driver is not ready on more */ 1472 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1473 return; 1474 } 1475 1476 virtio_queue_set_notification(q->tx_vq, 1); 1477 virtio_net_flush_tx(q); 1478 } 1479 1480 static void virtio_net_tx_bh(void *opaque) 1481 { 1482 VirtIONetQueue *q = opaque; 1483 VirtIONet *n = q->n; 1484 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1485 int32_t ret; 1486 1487 /* This happens when device was stopped but BH wasn't. */ 1488 if (!vdev->vm_running) { 1489 /* Make sure tx waiting is set, so we'll run when restarted. */ 1490 assert(q->tx_waiting); 1491 return; 1492 } 1493 1494 q->tx_waiting = 0; 1495 1496 /* Just in case the driver is not ready on more */ 1497 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1498 return; 1499 } 1500 1501 ret = virtio_net_flush_tx(q); 1502 if (ret == -EBUSY || ret == -EINVAL) { 1503 return; /* Notification re-enable handled by tx_complete or device 1504 * broken */ 1505 } 1506 1507 /* If we flush a full burst of packets, assume there are 1508 * more coming and immediately reschedule */ 1509 if (ret >= n->tx_burst) { 1510 qemu_bh_schedule(q->tx_bh); 1511 q->tx_waiting = 1; 1512 return; 1513 } 1514 1515 /* If less than a full burst, re-enable notification and flush 1516 * anything that may have come in while we weren't looking. If 1517 * we find something, assume the guest is still active and reschedule */ 1518 virtio_queue_set_notification(q->tx_vq, 1); 1519 ret = virtio_net_flush_tx(q); 1520 if (ret == -EINVAL) { 1521 return; 1522 } else if (ret > 0) { 1523 virtio_queue_set_notification(q->tx_vq, 0); 1524 qemu_bh_schedule(q->tx_bh); 1525 q->tx_waiting = 1; 1526 } 1527 } 1528 1529 static void virtio_net_add_queue(VirtIONet *n, int index) 1530 { 1531 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1532 1533 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 1534 virtio_net_handle_rx); 1535 1536 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1537 n->vqs[index].tx_vq = 1538 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 1539 virtio_net_handle_tx_timer); 1540 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1541 virtio_net_tx_timer, 1542 &n->vqs[index]); 1543 } else { 1544 n->vqs[index].tx_vq = 1545 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 1546 virtio_net_handle_tx_bh); 1547 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); 1548 } 1549 1550 n->vqs[index].tx_waiting = 0; 1551 n->vqs[index].n = n; 1552 } 1553 1554 static void virtio_net_del_queue(VirtIONet *n, int index) 1555 { 1556 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1557 VirtIONetQueue *q = &n->vqs[index]; 1558 NetClientState *nc = qemu_get_subqueue(n->nic, index); 1559 1560 qemu_purge_queued_packets(nc); 1561 1562 virtio_del_queue(vdev, index * 2); 1563 if (q->tx_timer) { 1564 timer_del(q->tx_timer); 1565 timer_free(q->tx_timer); 1566 q->tx_timer = NULL; 1567 } else { 1568 qemu_bh_delete(q->tx_bh); 1569 q->tx_bh = NULL; 1570 } 1571 q->tx_waiting = 0; 1572 virtio_del_queue(vdev, index * 2 + 1); 1573 } 1574 1575 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) 1576 { 1577 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1578 int old_num_queues = virtio_get_num_queues(vdev); 1579 int new_num_queues = new_max_queues * 2 + 1; 1580 int i; 1581 1582 assert(old_num_queues >= 3); 1583 assert(old_num_queues % 2 == 1); 1584 1585 if (old_num_queues == new_num_queues) { 1586 return; 1587 } 1588 1589 /* 1590 * We always need to remove and add ctrl vq if 1591 * old_num_queues != new_num_queues. Remove ctrl_vq first, 1592 * and then we only enter one of the following too loops. 1593 */ 1594 virtio_del_queue(vdev, old_num_queues - 1); 1595 1596 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 1597 /* new_num_queues < old_num_queues */ 1598 virtio_net_del_queue(n, i / 2); 1599 } 1600 1601 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 1602 /* new_num_queues > old_num_queues */ 1603 virtio_net_add_queue(n, i / 2); 1604 } 1605 1606 /* add ctrl_vq last */ 1607 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1608 } 1609 1610 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1611 { 1612 int max = multiqueue ? n->max_queues : 1; 1613 1614 n->multiqueue = multiqueue; 1615 virtio_net_change_num_queues(n, max); 1616 1617 virtio_net_set_queues(n); 1618 } 1619 1620 static int virtio_net_post_load_device(void *opaque, int version_id) 1621 { 1622 VirtIONet *n = opaque; 1623 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1624 int i, link_down; 1625 1626 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 1627 virtio_vdev_has_feature(vdev, 1628 VIRTIO_F_VERSION_1)); 1629 1630 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1631 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 1632 n->mac_table.in_use = 0; 1633 } 1634 1635 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1636 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1637 } 1638 1639 if (peer_has_vnet_hdr(n)) { 1640 virtio_net_apply_guest_offloads(n); 1641 } 1642 1643 virtio_net_set_queues(n); 1644 1645 /* Find the first multicast entry in the saved MAC filter */ 1646 for (i = 0; i < n->mac_table.in_use; i++) { 1647 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1648 break; 1649 } 1650 } 1651 n->mac_table.first_multi = i; 1652 1653 /* nc.link_down can't be migrated, so infer link_down according 1654 * to link status bit in n->status */ 1655 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1656 for (i = 0; i < n->max_queues; i++) { 1657 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1658 } 1659 1660 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1661 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1662 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1663 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1664 } 1665 1666 return 0; 1667 } 1668 1669 /* tx_waiting field of a VirtIONetQueue */ 1670 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 1671 .name = "virtio-net-queue-tx_waiting", 1672 .fields = (VMStateField[]) { 1673 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 1674 VMSTATE_END_OF_LIST() 1675 }, 1676 }; 1677 1678 static bool max_queues_gt_1(void *opaque, int version_id) 1679 { 1680 return VIRTIO_NET(opaque)->max_queues > 1; 1681 } 1682 1683 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 1684 { 1685 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 1686 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 1687 } 1688 1689 static bool mac_table_fits(void *opaque, int version_id) 1690 { 1691 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 1692 } 1693 1694 static bool mac_table_doesnt_fit(void *opaque, int version_id) 1695 { 1696 return !mac_table_fits(opaque, version_id); 1697 } 1698 1699 /* This temporary type is shared by all the WITH_TMP methods 1700 * although only some fields are used by each. 1701 */ 1702 struct VirtIONetMigTmp { 1703 VirtIONet *parent; 1704 VirtIONetQueue *vqs_1; 1705 uint16_t curr_queues_1; 1706 uint8_t has_ufo; 1707 uint32_t has_vnet_hdr; 1708 }; 1709 1710 /* The 2nd and subsequent tx_waiting flags are loaded later than 1711 * the 1st entry in the queues and only if there's more than one 1712 * entry. We use the tmp mechanism to calculate a temporary 1713 * pointer and count and also validate the count. 1714 */ 1715 1716 static int virtio_net_tx_waiting_pre_save(void *opaque) 1717 { 1718 struct VirtIONetMigTmp *tmp = opaque; 1719 1720 tmp->vqs_1 = tmp->parent->vqs + 1; 1721 tmp->curr_queues_1 = tmp->parent->curr_queues - 1; 1722 if (tmp->parent->curr_queues == 0) { 1723 tmp->curr_queues_1 = 0; 1724 } 1725 1726 return 0; 1727 } 1728 1729 static int virtio_net_tx_waiting_pre_load(void *opaque) 1730 { 1731 struct VirtIONetMigTmp *tmp = opaque; 1732 1733 /* Reuse the pointer setup from save */ 1734 virtio_net_tx_waiting_pre_save(opaque); 1735 1736 if (tmp->parent->curr_queues > tmp->parent->max_queues) { 1737 error_report("virtio-net: curr_queues %x > max_queues %x", 1738 tmp->parent->curr_queues, tmp->parent->max_queues); 1739 1740 return -EINVAL; 1741 } 1742 1743 return 0; /* all good */ 1744 } 1745 1746 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 1747 .name = "virtio-net-tx_waiting", 1748 .pre_load = virtio_net_tx_waiting_pre_load, 1749 .pre_save = virtio_net_tx_waiting_pre_save, 1750 .fields = (VMStateField[]) { 1751 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 1752 curr_queues_1, 1753 vmstate_virtio_net_queue_tx_waiting, 1754 struct VirtIONetQueue), 1755 VMSTATE_END_OF_LIST() 1756 }, 1757 }; 1758 1759 /* the 'has_ufo' flag is just tested; if the incoming stream has the 1760 * flag set we need to check that we have it 1761 */ 1762 static int virtio_net_ufo_post_load(void *opaque, int version_id) 1763 { 1764 struct VirtIONetMigTmp *tmp = opaque; 1765 1766 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 1767 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1768 return -EINVAL; 1769 } 1770 1771 return 0; 1772 } 1773 1774 static int virtio_net_ufo_pre_save(void *opaque) 1775 { 1776 struct VirtIONetMigTmp *tmp = opaque; 1777 1778 tmp->has_ufo = tmp->parent->has_ufo; 1779 1780 return 0; 1781 } 1782 1783 static const VMStateDescription vmstate_virtio_net_has_ufo = { 1784 .name = "virtio-net-ufo", 1785 .post_load = virtio_net_ufo_post_load, 1786 .pre_save = virtio_net_ufo_pre_save, 1787 .fields = (VMStateField[]) { 1788 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 1789 VMSTATE_END_OF_LIST() 1790 }, 1791 }; 1792 1793 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 1794 * flag set we need to check that we have it 1795 */ 1796 static int virtio_net_vnet_post_load(void *opaque, int version_id) 1797 { 1798 struct VirtIONetMigTmp *tmp = opaque; 1799 1800 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 1801 error_report("virtio-net: saved image requires vnet_hdr=on"); 1802 return -EINVAL; 1803 } 1804 1805 return 0; 1806 } 1807 1808 static int virtio_net_vnet_pre_save(void *opaque) 1809 { 1810 struct VirtIONetMigTmp *tmp = opaque; 1811 1812 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 1813 1814 return 0; 1815 } 1816 1817 static const VMStateDescription vmstate_virtio_net_has_vnet = { 1818 .name = "virtio-net-vnet", 1819 .post_load = virtio_net_vnet_post_load, 1820 .pre_save = virtio_net_vnet_pre_save, 1821 .fields = (VMStateField[]) { 1822 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 1823 VMSTATE_END_OF_LIST() 1824 }, 1825 }; 1826 1827 static const VMStateDescription vmstate_virtio_net_device = { 1828 .name = "virtio-net-device", 1829 .version_id = VIRTIO_NET_VM_VERSION, 1830 .minimum_version_id = VIRTIO_NET_VM_VERSION, 1831 .post_load = virtio_net_post_load_device, 1832 .fields = (VMStateField[]) { 1833 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 1834 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 1835 vmstate_virtio_net_queue_tx_waiting, 1836 VirtIONetQueue), 1837 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 1838 VMSTATE_UINT16(status, VirtIONet), 1839 VMSTATE_UINT8(promisc, VirtIONet), 1840 VMSTATE_UINT8(allmulti, VirtIONet), 1841 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 1842 1843 /* Guarded pair: If it fits we load it, else we throw it away 1844 * - can happen if source has a larger MAC table.; post-load 1845 * sets flags in this case. 1846 */ 1847 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 1848 0, mac_table_fits, mac_table.in_use, 1849 ETH_ALEN), 1850 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 1851 mac_table.in_use, ETH_ALEN), 1852 1853 /* Note: This is an array of uint32's that's always been saved as a 1854 * buffer; hold onto your endiannesses; it's actually used as a bitmap 1855 * but based on the uint. 1856 */ 1857 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 1858 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1859 vmstate_virtio_net_has_vnet), 1860 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 1861 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 1862 VMSTATE_UINT8(alluni, VirtIONet), 1863 VMSTATE_UINT8(nomulti, VirtIONet), 1864 VMSTATE_UINT8(nouni, VirtIONet), 1865 VMSTATE_UINT8(nobcast, VirtIONet), 1866 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1867 vmstate_virtio_net_has_ufo), 1868 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0, 1869 vmstate_info_uint16_equal, uint16_t), 1870 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1), 1871 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 1872 vmstate_virtio_net_tx_waiting), 1873 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 1874 has_ctrl_guest_offloads), 1875 VMSTATE_END_OF_LIST() 1876 }, 1877 }; 1878 1879 static NetClientInfo net_virtio_info = { 1880 .type = NET_CLIENT_DRIVER_NIC, 1881 .size = sizeof(NICState), 1882 .can_receive = virtio_net_can_receive, 1883 .receive = virtio_net_receive, 1884 .link_status_changed = virtio_net_set_link_status, 1885 .query_rx_filter = virtio_net_query_rxfilter, 1886 }; 1887 1888 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1889 { 1890 VirtIONet *n = VIRTIO_NET(vdev); 1891 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1892 assert(n->vhost_started); 1893 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1894 } 1895 1896 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1897 bool mask) 1898 { 1899 VirtIONet *n = VIRTIO_NET(vdev); 1900 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1901 assert(n->vhost_started); 1902 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1903 vdev, idx, mask); 1904 } 1905 1906 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1907 { 1908 int i, config_size = 0; 1909 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1910 1911 for (i = 0; feature_sizes[i].flags != 0; i++) { 1912 if (host_features & feature_sizes[i].flags) { 1913 config_size = MAX(feature_sizes[i].end, config_size); 1914 } 1915 } 1916 n->config_size = config_size; 1917 } 1918 1919 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1920 const char *type) 1921 { 1922 /* 1923 * The name can be NULL, the netclient name will be type.x. 1924 */ 1925 assert(type != NULL); 1926 1927 g_free(n->netclient_name); 1928 g_free(n->netclient_type); 1929 n->netclient_name = g_strdup(name); 1930 n->netclient_type = g_strdup(type); 1931 } 1932 1933 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1934 { 1935 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1936 VirtIONet *n = VIRTIO_NET(dev); 1937 NetClientState *nc; 1938 int i; 1939 1940 if (n->net_conf.mtu) { 1941 n->host_features |= (0x1 << VIRTIO_NET_F_MTU); 1942 } 1943 1944 virtio_net_set_config_size(n, n->host_features); 1945 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1946 1947 /* 1948 * We set a lower limit on RX queue size to what it always was. 1949 * Guests that want a smaller ring can always resize it without 1950 * help from us (using virtio 1 and up). 1951 */ 1952 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 1953 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 1954 !is_power_of_2(n->net_conf.rx_queue_size)) { 1955 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 1956 "must be a power of 2 between %d and %d.", 1957 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 1958 VIRTQUEUE_MAX_SIZE); 1959 virtio_cleanup(vdev); 1960 return; 1961 } 1962 1963 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || 1964 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE || 1965 !is_power_of_2(n->net_conf.tx_queue_size)) { 1966 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " 1967 "must be a power of 2 between %d and %d", 1968 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, 1969 VIRTQUEUE_MAX_SIZE); 1970 virtio_cleanup(vdev); 1971 return; 1972 } 1973 1974 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1975 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 1976 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1977 "must be a positive integer less than %d.", 1978 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 1979 virtio_cleanup(vdev); 1980 return; 1981 } 1982 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1983 n->curr_queues = 1; 1984 n->tx_timeout = n->net_conf.txtimer; 1985 1986 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1987 && strcmp(n->net_conf.tx, "bh")) { 1988 error_report("virtio-net: " 1989 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1990 n->net_conf.tx); 1991 error_report("Defaulting to \"bh\""); 1992 } 1993 1994 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), 1995 n->net_conf.tx_queue_size); 1996 1997 for (i = 0; i < n->max_queues; i++) { 1998 virtio_net_add_queue(n, i); 1999 } 2000 2001 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 2002 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 2003 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 2004 n->status = VIRTIO_NET_S_LINK_UP; 2005 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 2006 virtio_net_announce_timer, n); 2007 2008 if (n->netclient_type) { 2009 /* 2010 * Happen when virtio_net_set_netclient_name has been called. 2011 */ 2012 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 2013 n->netclient_type, n->netclient_name, n); 2014 } else { 2015 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 2016 object_get_typename(OBJECT(dev)), dev->id, n); 2017 } 2018 2019 peer_test_vnet_hdr(n); 2020 if (peer_has_vnet_hdr(n)) { 2021 for (i = 0; i < n->max_queues; i++) { 2022 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 2023 } 2024 n->host_hdr_len = sizeof(struct virtio_net_hdr); 2025 } else { 2026 n->host_hdr_len = 0; 2027 } 2028 2029 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 2030 2031 n->vqs[0].tx_waiting = 0; 2032 n->tx_burst = n->net_conf.txburst; 2033 virtio_net_set_mrg_rx_bufs(n, 0, 0); 2034 n->promisc = 1; /* for compatibility */ 2035 2036 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 2037 2038 n->vlans = g_malloc0(MAX_VLAN >> 3); 2039 2040 nc = qemu_get_queue(n->nic); 2041 nc->rxfilter_notify_enabled = 1; 2042 2043 n->qdev = dev; 2044 } 2045 2046 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 2047 { 2048 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 2049 VirtIONet *n = VIRTIO_NET(dev); 2050 int i, max_queues; 2051 2052 /* This will stop vhost backend if appropriate. */ 2053 virtio_net_set_status(vdev, 0); 2054 2055 g_free(n->netclient_name); 2056 n->netclient_name = NULL; 2057 g_free(n->netclient_type); 2058 n->netclient_type = NULL; 2059 2060 g_free(n->mac_table.macs); 2061 g_free(n->vlans); 2062 2063 max_queues = n->multiqueue ? n->max_queues : 1; 2064 for (i = 0; i < max_queues; i++) { 2065 virtio_net_del_queue(n, i); 2066 } 2067 2068 timer_del(n->announce_timer); 2069 timer_free(n->announce_timer); 2070 g_free(n->vqs); 2071 qemu_del_nic(n->nic); 2072 virtio_cleanup(vdev); 2073 } 2074 2075 static void virtio_net_instance_init(Object *obj) 2076 { 2077 VirtIONet *n = VIRTIO_NET(obj); 2078 2079 /* 2080 * The default config_size is sizeof(struct virtio_net_config). 2081 * Can be overriden with virtio_net_set_config_size. 2082 */ 2083 n->config_size = sizeof(struct virtio_net_config); 2084 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 2085 "bootindex", "/ethernet-phy@0", 2086 DEVICE(n), NULL); 2087 } 2088 2089 static int virtio_net_pre_save(void *opaque) 2090 { 2091 VirtIONet *n = opaque; 2092 2093 /* At this point, backend must be stopped, otherwise 2094 * it might keep writing to memory. */ 2095 assert(!n->vhost_started); 2096 2097 return 0; 2098 } 2099 2100 static const VMStateDescription vmstate_virtio_net = { 2101 .name = "virtio-net", 2102 .minimum_version_id = VIRTIO_NET_VM_VERSION, 2103 .version_id = VIRTIO_NET_VM_VERSION, 2104 .fields = (VMStateField[]) { 2105 VMSTATE_VIRTIO_DEVICE, 2106 VMSTATE_END_OF_LIST() 2107 }, 2108 .pre_save = virtio_net_pre_save, 2109 }; 2110 2111 static Property virtio_net_properties[] = { 2112 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), 2113 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, 2114 VIRTIO_NET_F_GUEST_CSUM, true), 2115 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 2116 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, 2117 VIRTIO_NET_F_GUEST_TSO4, true), 2118 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, 2119 VIRTIO_NET_F_GUEST_TSO6, true), 2120 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, 2121 VIRTIO_NET_F_GUEST_ECN, true), 2122 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, 2123 VIRTIO_NET_F_GUEST_UFO, true), 2124 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, 2125 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 2126 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, 2127 VIRTIO_NET_F_HOST_TSO4, true), 2128 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, 2129 VIRTIO_NET_F_HOST_TSO6, true), 2130 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, 2131 VIRTIO_NET_F_HOST_ECN, true), 2132 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, 2133 VIRTIO_NET_F_HOST_UFO, true), 2134 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, 2135 VIRTIO_NET_F_MRG_RXBUF, true), 2136 DEFINE_PROP_BIT("status", VirtIONet, host_features, 2137 VIRTIO_NET_F_STATUS, true), 2138 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, 2139 VIRTIO_NET_F_CTRL_VQ, true), 2140 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, 2141 VIRTIO_NET_F_CTRL_RX, true), 2142 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, 2143 VIRTIO_NET_F_CTRL_VLAN, true), 2144 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, 2145 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 2146 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, 2147 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 2148 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, 2149 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 2150 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 2151 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 2152 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 2153 TX_TIMER_INTERVAL), 2154 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 2155 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 2156 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 2157 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 2158 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 2159 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), 2160 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 2161 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 2162 true), 2163 DEFINE_PROP_END_OF_LIST(), 2164 }; 2165 2166 static void virtio_net_class_init(ObjectClass *klass, void *data) 2167 { 2168 DeviceClass *dc = DEVICE_CLASS(klass); 2169 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 2170 2171 dc->props = virtio_net_properties; 2172 dc->vmsd = &vmstate_virtio_net; 2173 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 2174 vdc->realize = virtio_net_device_realize; 2175 vdc->unrealize = virtio_net_device_unrealize; 2176 vdc->get_config = virtio_net_get_config; 2177 vdc->set_config = virtio_net_set_config; 2178 vdc->get_features = virtio_net_get_features; 2179 vdc->set_features = virtio_net_set_features; 2180 vdc->bad_features = virtio_net_bad_features; 2181 vdc->reset = virtio_net_reset; 2182 vdc->set_status = virtio_net_set_status; 2183 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 2184 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 2185 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 2186 vdc->vmsd = &vmstate_virtio_net_device; 2187 } 2188 2189 static const TypeInfo virtio_net_info = { 2190 .name = TYPE_VIRTIO_NET, 2191 .parent = TYPE_VIRTIO_DEVICE, 2192 .instance_size = sizeof(VirtIONet), 2193 .instance_init = virtio_net_instance_init, 2194 .class_init = virtio_net_class_init, 2195 }; 2196 2197 static void virtio_register_types(void) 2198 { 2199 type_register_static(&virtio_net_info); 2200 } 2201 2202 type_init(virtio_register_types) 2203