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