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/atomic.h" 16 #include "qemu/iov.h" 17 #include "qemu/main-loop.h" 18 #include "qemu/module.h" 19 #include "hw/virtio/virtio.h" 20 #include "net/net.h" 21 #include "net/checksum.h" 22 #include "net/tap.h" 23 #include "qemu/error-report.h" 24 #include "qemu/timer.h" 25 #include "qemu/option.h" 26 #include "qemu/option_int.h" 27 #include "qemu/config-file.h" 28 #include "qapi/qmp/qdict.h" 29 #include "hw/virtio/virtio-net.h" 30 #include "net/vhost_net.h" 31 #include "net/announce.h" 32 #include "hw/virtio/virtio-bus.h" 33 #include "qapi/error.h" 34 #include "qapi/qapi-events-net.h" 35 #include "hw/qdev-properties.h" 36 #include "qapi/qapi-types-migration.h" 37 #include "qapi/qapi-events-migration.h" 38 #include "hw/virtio/virtio-access.h" 39 #include "migration/misc.h" 40 #include "standard-headers/linux/ethtool.h" 41 #include "sysemu/sysemu.h" 42 #include "trace.h" 43 #include "monitor/qdev.h" 44 #include "hw/pci/pci.h" 45 46 #define VIRTIO_NET_VM_VERSION 11 47 48 #define MAC_TABLE_ENTRIES 64 49 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 50 51 /* previously fixed value */ 52 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 53 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256 54 55 /* for now, only allow larger queues; with virtio-1, guest can downsize */ 56 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 57 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 58 59 #define VIRTIO_NET_IP4_ADDR_SIZE 8 /* ipv4 saddr + daddr */ 60 61 #define VIRTIO_NET_TCP_FLAG 0x3F 62 #define VIRTIO_NET_TCP_HDR_LENGTH 0xF000 63 64 /* IPv4 max payload, 16 bits in the header */ 65 #define VIRTIO_NET_MAX_IP4_PAYLOAD (65535 - sizeof(struct ip_header)) 66 #define VIRTIO_NET_MAX_TCP_PAYLOAD 65535 67 68 /* header length value in ip header without option */ 69 #define VIRTIO_NET_IP4_HEADER_LENGTH 5 70 71 #define VIRTIO_NET_IP6_ADDR_SIZE 32 /* ipv6 saddr + daddr */ 72 #define VIRTIO_NET_MAX_IP6_PAYLOAD VIRTIO_NET_MAX_TCP_PAYLOAD 73 74 /* Purge coalesced packets timer interval, This value affects the performance 75 a lot, and should be tuned carefully, '300000'(300us) is the recommended 76 value to pass the WHQL test, '50000' can gain 2x netperf throughput with 77 tso/gso/gro 'off'. */ 78 #define VIRTIO_NET_RSC_DEFAULT_INTERVAL 300000 79 80 /* temporary until standard header include it */ 81 #if !defined(VIRTIO_NET_HDR_F_RSC_INFO) 82 83 #define VIRTIO_NET_HDR_F_RSC_INFO 4 /* rsc_ext data in csum_ fields */ 84 #define VIRTIO_NET_F_RSC_EXT 61 85 86 static inline __virtio16 *virtio_net_rsc_ext_num_packets( 87 struct virtio_net_hdr *hdr) 88 { 89 return &hdr->csum_start; 90 } 91 92 static inline __virtio16 *virtio_net_rsc_ext_num_dupacks( 93 struct virtio_net_hdr *hdr) 94 { 95 return &hdr->csum_offset; 96 } 97 98 #endif 99 100 static VirtIOFeature feature_sizes[] = { 101 {.flags = 1ULL << VIRTIO_NET_F_MAC, 102 .end = endof(struct virtio_net_config, mac)}, 103 {.flags = 1ULL << VIRTIO_NET_F_STATUS, 104 .end = endof(struct virtio_net_config, status)}, 105 {.flags = 1ULL << VIRTIO_NET_F_MQ, 106 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 107 {.flags = 1ULL << VIRTIO_NET_F_MTU, 108 .end = endof(struct virtio_net_config, mtu)}, 109 {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX, 110 .end = endof(struct virtio_net_config, duplex)}, 111 {} 112 }; 113 114 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 115 { 116 VirtIONet *n = qemu_get_nic_opaque(nc); 117 118 return &n->vqs[nc->queue_index]; 119 } 120 121 static int vq2q(int queue_index) 122 { 123 return queue_index / 2; 124 } 125 126 /* TODO 127 * - we could suppress RX interrupt if we were so inclined. 128 */ 129 130 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 131 { 132 VirtIONet *n = VIRTIO_NET(vdev); 133 struct virtio_net_config netcfg; 134 135 virtio_stw_p(vdev, &netcfg.status, n->status); 136 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 137 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); 138 memcpy(netcfg.mac, n->mac, ETH_ALEN); 139 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed); 140 netcfg.duplex = n->net_conf.duplex; 141 memcpy(config, &netcfg, n->config_size); 142 } 143 144 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 145 { 146 VirtIONet *n = VIRTIO_NET(vdev); 147 struct virtio_net_config netcfg = {}; 148 149 memcpy(&netcfg, config, n->config_size); 150 151 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 152 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 153 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 154 memcpy(n->mac, netcfg.mac, ETH_ALEN); 155 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 156 } 157 } 158 159 static bool virtio_net_started(VirtIONet *n, uint8_t status) 160 { 161 VirtIODevice *vdev = VIRTIO_DEVICE(n); 162 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 163 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 164 } 165 166 static void virtio_net_announce_notify(VirtIONet *net) 167 { 168 VirtIODevice *vdev = VIRTIO_DEVICE(net); 169 trace_virtio_net_announce_notify(); 170 171 net->status |= VIRTIO_NET_S_ANNOUNCE; 172 virtio_notify_config(vdev); 173 } 174 175 static void virtio_net_announce_timer(void *opaque) 176 { 177 VirtIONet *n = opaque; 178 trace_virtio_net_announce_timer(n->announce_timer.round); 179 180 n->announce_timer.round--; 181 virtio_net_announce_notify(n); 182 } 183 184 static void virtio_net_announce(NetClientState *nc) 185 { 186 VirtIONet *n = qemu_get_nic_opaque(nc); 187 VirtIODevice *vdev = VIRTIO_DEVICE(n); 188 189 /* 190 * Make sure the virtio migration announcement timer isn't running 191 * If it is, let it trigger announcement so that we do not cause 192 * confusion. 193 */ 194 if (n->announce_timer.round) { 195 return; 196 } 197 198 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 199 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 200 virtio_net_announce_notify(n); 201 } 202 } 203 204 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 205 { 206 VirtIODevice *vdev = VIRTIO_DEVICE(n); 207 NetClientState *nc = qemu_get_queue(n->nic); 208 int queues = n->multiqueue ? n->max_queues : 1; 209 210 if (!get_vhost_net(nc->peer)) { 211 return; 212 } 213 214 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 215 !!n->vhost_started) { 216 return; 217 } 218 if (!n->vhost_started) { 219 int r, i; 220 221 if (n->needs_vnet_hdr_swap) { 222 error_report("backend does not support %s vnet headers; " 223 "falling back on userspace virtio", 224 virtio_is_big_endian(vdev) ? "BE" : "LE"); 225 return; 226 } 227 228 /* Any packets outstanding? Purge them to avoid touching rings 229 * when vhost is running. 230 */ 231 for (i = 0; i < queues; i++) { 232 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 233 234 /* Purge both directions: TX and RX. */ 235 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 236 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 237 } 238 239 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { 240 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); 241 if (r < 0) { 242 error_report("%uBytes MTU not supported by the backend", 243 n->net_conf.mtu); 244 245 return; 246 } 247 } 248 249 n->vhost_started = 1; 250 r = vhost_net_start(vdev, n->nic->ncs, queues); 251 if (r < 0) { 252 error_report("unable to start vhost net: %d: " 253 "falling back on userspace virtio", -r); 254 n->vhost_started = 0; 255 } 256 } else { 257 vhost_net_stop(vdev, n->nic->ncs, queues); 258 n->vhost_started = 0; 259 } 260 } 261 262 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 263 NetClientState *peer, 264 bool enable) 265 { 266 if (virtio_is_big_endian(vdev)) { 267 return qemu_set_vnet_be(peer, enable); 268 } else { 269 return qemu_set_vnet_le(peer, enable); 270 } 271 } 272 273 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 274 int queues, bool enable) 275 { 276 int i; 277 278 for (i = 0; i < queues; i++) { 279 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 280 enable) { 281 while (--i >= 0) { 282 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 283 } 284 285 return true; 286 } 287 } 288 289 return false; 290 } 291 292 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 293 { 294 VirtIODevice *vdev = VIRTIO_DEVICE(n); 295 int queues = n->multiqueue ? n->max_queues : 1; 296 297 if (virtio_net_started(n, status)) { 298 /* Before using the device, we tell the network backend about the 299 * endianness to use when parsing vnet headers. If the backend 300 * can't do it, we fallback onto fixing the headers in the core 301 * virtio-net code. 302 */ 303 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, 304 queues, true); 305 } else if (virtio_net_started(n, vdev->status)) { 306 /* After using the device, we need to reset the network backend to 307 * the default (guest native endianness), otherwise the guest may 308 * lose network connectivity if it is rebooted into a different 309 * endianness. 310 */ 311 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); 312 } 313 } 314 315 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) 316 { 317 unsigned int dropped = virtqueue_drop_all(vq); 318 if (dropped) { 319 virtio_notify(vdev, vq); 320 } 321 } 322 323 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 324 { 325 VirtIONet *n = VIRTIO_NET(vdev); 326 VirtIONetQueue *q; 327 int i; 328 uint8_t queue_status; 329 330 virtio_net_vnet_endian_status(n, status); 331 virtio_net_vhost_status(n, status); 332 333 for (i = 0; i < n->max_queues; i++) { 334 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 335 bool queue_started; 336 q = &n->vqs[i]; 337 338 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 339 queue_status = 0; 340 } else { 341 queue_status = status; 342 } 343 queue_started = 344 virtio_net_started(n, queue_status) && !n->vhost_started; 345 346 if (queue_started) { 347 qemu_flush_queued_packets(ncs); 348 } 349 350 if (!q->tx_waiting) { 351 continue; 352 } 353 354 if (queue_started) { 355 if (q->tx_timer) { 356 timer_mod(q->tx_timer, 357 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 358 } else { 359 qemu_bh_schedule(q->tx_bh); 360 } 361 } else { 362 if (q->tx_timer) { 363 timer_del(q->tx_timer); 364 } else { 365 qemu_bh_cancel(q->tx_bh); 366 } 367 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && 368 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) && 369 vdev->vm_running) { 370 /* if tx is waiting we are likely have some packets in tx queue 371 * and disabled notification */ 372 q->tx_waiting = 0; 373 virtio_queue_set_notification(q->tx_vq, 1); 374 virtio_net_drop_tx_queue_data(vdev, q->tx_vq); 375 } 376 } 377 } 378 } 379 380 static void virtio_net_set_link_status(NetClientState *nc) 381 { 382 VirtIONet *n = qemu_get_nic_opaque(nc); 383 VirtIODevice *vdev = VIRTIO_DEVICE(n); 384 uint16_t old_status = n->status; 385 386 if (nc->link_down) 387 n->status &= ~VIRTIO_NET_S_LINK_UP; 388 else 389 n->status |= VIRTIO_NET_S_LINK_UP; 390 391 if (n->status != old_status) 392 virtio_notify_config(vdev); 393 394 virtio_net_set_status(vdev, vdev->status); 395 } 396 397 static void rxfilter_notify(NetClientState *nc) 398 { 399 VirtIONet *n = qemu_get_nic_opaque(nc); 400 401 if (nc->rxfilter_notify_enabled) { 402 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 403 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 404 n->netclient_name, path); 405 g_free(path); 406 407 /* disable event notification to avoid events flooding */ 408 nc->rxfilter_notify_enabled = 0; 409 } 410 } 411 412 static intList *get_vlan_table(VirtIONet *n) 413 { 414 intList *list, *entry; 415 int i, j; 416 417 list = NULL; 418 for (i = 0; i < MAX_VLAN >> 5; i++) { 419 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 420 if (n->vlans[i] & (1U << j)) { 421 entry = g_malloc0(sizeof(*entry)); 422 entry->value = (i << 5) + j; 423 entry->next = list; 424 list = entry; 425 } 426 } 427 } 428 429 return list; 430 } 431 432 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 433 { 434 VirtIONet *n = qemu_get_nic_opaque(nc); 435 VirtIODevice *vdev = VIRTIO_DEVICE(n); 436 RxFilterInfo *info; 437 strList *str_list, *entry; 438 int i; 439 440 info = g_malloc0(sizeof(*info)); 441 info->name = g_strdup(nc->name); 442 info->promiscuous = n->promisc; 443 444 if (n->nouni) { 445 info->unicast = RX_STATE_NONE; 446 } else if (n->alluni) { 447 info->unicast = RX_STATE_ALL; 448 } else { 449 info->unicast = RX_STATE_NORMAL; 450 } 451 452 if (n->nomulti) { 453 info->multicast = RX_STATE_NONE; 454 } else if (n->allmulti) { 455 info->multicast = RX_STATE_ALL; 456 } else { 457 info->multicast = RX_STATE_NORMAL; 458 } 459 460 info->broadcast_allowed = n->nobcast; 461 info->multicast_overflow = n->mac_table.multi_overflow; 462 info->unicast_overflow = n->mac_table.uni_overflow; 463 464 info->main_mac = qemu_mac_strdup_printf(n->mac); 465 466 str_list = NULL; 467 for (i = 0; i < n->mac_table.first_multi; i++) { 468 entry = g_malloc0(sizeof(*entry)); 469 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 470 entry->next = str_list; 471 str_list = entry; 472 } 473 info->unicast_table = str_list; 474 475 str_list = NULL; 476 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 477 entry = g_malloc0(sizeof(*entry)); 478 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 479 entry->next = str_list; 480 str_list = entry; 481 } 482 info->multicast_table = str_list; 483 info->vlan_table = get_vlan_table(n); 484 485 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 486 info->vlan = RX_STATE_ALL; 487 } else if (!info->vlan_table) { 488 info->vlan = RX_STATE_NONE; 489 } else { 490 info->vlan = RX_STATE_NORMAL; 491 } 492 493 /* enable event notification after query */ 494 nc->rxfilter_notify_enabled = 1; 495 496 return info; 497 } 498 499 static void virtio_net_reset(VirtIODevice *vdev) 500 { 501 VirtIONet *n = VIRTIO_NET(vdev); 502 int i; 503 504 /* Reset back to compatibility mode */ 505 n->promisc = 1; 506 n->allmulti = 0; 507 n->alluni = 0; 508 n->nomulti = 0; 509 n->nouni = 0; 510 n->nobcast = 0; 511 /* multiqueue is disabled by default */ 512 n->curr_queues = 1; 513 timer_del(n->announce_timer.tm); 514 n->announce_timer.round = 0; 515 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 516 517 /* Flush any MAC and VLAN filter table state */ 518 n->mac_table.in_use = 0; 519 n->mac_table.first_multi = 0; 520 n->mac_table.multi_overflow = 0; 521 n->mac_table.uni_overflow = 0; 522 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 523 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 524 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 525 memset(n->vlans, 0, MAX_VLAN >> 3); 526 527 /* Flush any async TX */ 528 for (i = 0; i < n->max_queues; i++) { 529 NetClientState *nc = qemu_get_subqueue(n->nic, i); 530 531 if (nc->peer) { 532 qemu_flush_or_purge_queued_packets(nc->peer, true); 533 assert(!virtio_net_get_subqueue(nc)->async_tx.elem); 534 } 535 } 536 } 537 538 static void peer_test_vnet_hdr(VirtIONet *n) 539 { 540 NetClientState *nc = qemu_get_queue(n->nic); 541 if (!nc->peer) { 542 return; 543 } 544 545 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 546 } 547 548 static int peer_has_vnet_hdr(VirtIONet *n) 549 { 550 return n->has_vnet_hdr; 551 } 552 553 static int peer_has_ufo(VirtIONet *n) 554 { 555 if (!peer_has_vnet_hdr(n)) 556 return 0; 557 558 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 559 560 return n->has_ufo; 561 } 562 563 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 564 int version_1) 565 { 566 int i; 567 NetClientState *nc; 568 569 n->mergeable_rx_bufs = mergeable_rx_bufs; 570 571 if (version_1) { 572 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 573 } else { 574 n->guest_hdr_len = n->mergeable_rx_bufs ? 575 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 576 sizeof(struct virtio_net_hdr); 577 } 578 579 for (i = 0; i < n->max_queues; i++) { 580 nc = qemu_get_subqueue(n->nic, i); 581 582 if (peer_has_vnet_hdr(n) && 583 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 584 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 585 n->host_hdr_len = n->guest_hdr_len; 586 } 587 } 588 } 589 590 static int virtio_net_max_tx_queue_size(VirtIONet *n) 591 { 592 NetClientState *peer = n->nic_conf.peers.ncs[0]; 593 594 /* 595 * Backends other than vhost-user don't support max queue size. 596 */ 597 if (!peer) { 598 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 599 } 600 601 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) { 602 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 603 } 604 605 return VIRTQUEUE_MAX_SIZE; 606 } 607 608 static int peer_attach(VirtIONet *n, int index) 609 { 610 NetClientState *nc = qemu_get_subqueue(n->nic, index); 611 612 if (!nc->peer) { 613 return 0; 614 } 615 616 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 617 vhost_set_vring_enable(nc->peer, 1); 618 } 619 620 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 621 return 0; 622 } 623 624 if (n->max_queues == 1) { 625 return 0; 626 } 627 628 return tap_enable(nc->peer); 629 } 630 631 static int peer_detach(VirtIONet *n, int index) 632 { 633 NetClientState *nc = qemu_get_subqueue(n->nic, index); 634 635 if (!nc->peer) { 636 return 0; 637 } 638 639 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 640 vhost_set_vring_enable(nc->peer, 0); 641 } 642 643 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 644 return 0; 645 } 646 647 return tap_disable(nc->peer); 648 } 649 650 static void virtio_net_set_queues(VirtIONet *n) 651 { 652 int i; 653 int r; 654 655 if (n->nic->peer_deleted) { 656 return; 657 } 658 659 for (i = 0; i < n->max_queues; i++) { 660 if (i < n->curr_queues) { 661 r = peer_attach(n, i); 662 assert(!r); 663 } else { 664 r = peer_detach(n, i); 665 assert(!r); 666 } 667 } 668 } 669 670 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 671 672 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 673 Error **errp) 674 { 675 VirtIONet *n = VIRTIO_NET(vdev); 676 NetClientState *nc = qemu_get_queue(n->nic); 677 678 /* Firstly sync all virtio-net possible supported features */ 679 features |= n->host_features; 680 681 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 682 683 if (!peer_has_vnet_hdr(n)) { 684 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 685 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 686 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 687 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 688 689 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 690 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 691 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 692 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 693 } 694 695 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 696 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 697 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 698 } 699 700 if (!get_vhost_net(nc->peer)) { 701 return features; 702 } 703 704 features = vhost_net_get_features(get_vhost_net(nc->peer), features); 705 vdev->backend_features = features; 706 707 if (n->mtu_bypass_backend && 708 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { 709 features |= (1ULL << VIRTIO_NET_F_MTU); 710 } 711 712 return features; 713 } 714 715 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 716 { 717 uint64_t features = 0; 718 719 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 720 * but also these: */ 721 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 722 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 723 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 724 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 725 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 726 727 return features; 728 } 729 730 static void virtio_net_apply_guest_offloads(VirtIONet *n) 731 { 732 qemu_set_offload(qemu_get_queue(n->nic)->peer, 733 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 734 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 735 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 736 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 737 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 738 } 739 740 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 741 { 742 static const uint64_t guest_offloads_mask = 743 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 744 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 745 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 746 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 747 (1ULL << VIRTIO_NET_F_GUEST_UFO); 748 749 return guest_offloads_mask & features; 750 } 751 752 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 753 { 754 VirtIODevice *vdev = VIRTIO_DEVICE(n); 755 return virtio_net_guest_offloads_by_features(vdev->guest_features); 756 } 757 758 static void failover_add_primary(VirtIONet *n, Error **errp) 759 { 760 Error *err = NULL; 761 762 if (n->primary_dev) { 763 return; 764 } 765 766 n->primary_device_opts = qemu_opts_find(qemu_find_opts("device"), 767 n->primary_device_id); 768 if (n->primary_device_opts) { 769 n->primary_dev = qdev_device_add(n->primary_device_opts, &err); 770 if (err) { 771 qemu_opts_del(n->primary_device_opts); 772 } 773 if (n->primary_dev) { 774 n->primary_bus = n->primary_dev->parent_bus; 775 if (err) { 776 qdev_unplug(n->primary_dev, &err); 777 qdev_set_id(n->primary_dev, ""); 778 779 } 780 } 781 } else { 782 error_setg(errp, "Primary device not found"); 783 error_append_hint(errp, "Virtio-net failover will not work. Make " 784 "sure primary device has parameter" 785 " failover_pair_id=<virtio-net-id>\n"); 786 } 787 if (err) { 788 error_propagate(errp, err); 789 } 790 } 791 792 static int is_my_primary(void *opaque, QemuOpts *opts, Error **errp) 793 { 794 VirtIONet *n = opaque; 795 int ret = 0; 796 797 const char *standby_id = qemu_opt_get(opts, "failover_pair_id"); 798 799 if (standby_id != NULL && (g_strcmp0(standby_id, n->netclient_name) == 0)) { 800 n->primary_device_id = g_strdup(opts->id); 801 ret = 1; 802 } 803 804 return ret; 805 } 806 807 static DeviceState *virtio_net_find_primary(VirtIONet *n, Error **errp) 808 { 809 DeviceState *dev = NULL; 810 Error *err = NULL; 811 812 if (qemu_opts_foreach(qemu_find_opts("device"), 813 is_my_primary, n, &err)) { 814 if (err) { 815 error_propagate(errp, err); 816 return NULL; 817 } 818 if (n->primary_device_id) { 819 dev = qdev_find_recursive(sysbus_get_default(), 820 n->primary_device_id); 821 } else { 822 error_setg(errp, "Primary device id not found"); 823 return NULL; 824 } 825 } 826 return dev; 827 } 828 829 830 831 static DeviceState *virtio_connect_failover_devices(VirtIONet *n, 832 DeviceState *dev, 833 Error **errp) 834 { 835 DeviceState *prim_dev = NULL; 836 Error *err = NULL; 837 838 prim_dev = virtio_net_find_primary(n, &err); 839 if (prim_dev) { 840 n->primary_device_id = g_strdup(prim_dev->id); 841 n->primary_device_opts = prim_dev->opts; 842 } else { 843 if (err) { 844 error_propagate(errp, err); 845 } 846 } 847 848 return prim_dev; 849 } 850 851 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 852 { 853 VirtIONet *n = VIRTIO_NET(vdev); 854 Error *err = NULL; 855 int i; 856 857 if (n->mtu_bypass_backend && 858 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { 859 features &= ~(1ULL << VIRTIO_NET_F_MTU); 860 } 861 862 virtio_net_set_multiqueue(n, 863 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 864 865 virtio_net_set_mrg_rx_bufs(n, 866 virtio_has_feature(features, 867 VIRTIO_NET_F_MRG_RXBUF), 868 virtio_has_feature(features, 869 VIRTIO_F_VERSION_1)); 870 871 n->rsc4_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) && 872 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4); 873 n->rsc6_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) && 874 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6); 875 876 if (n->has_vnet_hdr) { 877 n->curr_guest_offloads = 878 virtio_net_guest_offloads_by_features(features); 879 virtio_net_apply_guest_offloads(n); 880 } 881 882 for (i = 0; i < n->max_queues; i++) { 883 NetClientState *nc = qemu_get_subqueue(n->nic, i); 884 885 if (!get_vhost_net(nc->peer)) { 886 continue; 887 } 888 vhost_net_ack_features(get_vhost_net(nc->peer), features); 889 } 890 891 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 892 memset(n->vlans, 0, MAX_VLAN >> 3); 893 } else { 894 memset(n->vlans, 0xff, MAX_VLAN >> 3); 895 } 896 897 if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) { 898 qapi_event_send_failover_negotiated(n->netclient_name); 899 atomic_set(&n->primary_should_be_hidden, false); 900 failover_add_primary(n, &err); 901 if (err) { 902 n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err); 903 if (err) { 904 goto out_err; 905 } 906 failover_add_primary(n, &err); 907 if (err) { 908 goto out_err; 909 } 910 } 911 } 912 return; 913 914 out_err: 915 if (err) { 916 warn_report_err(err); 917 } 918 } 919 920 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 921 struct iovec *iov, unsigned int iov_cnt) 922 { 923 uint8_t on; 924 size_t s; 925 NetClientState *nc = qemu_get_queue(n->nic); 926 927 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 928 if (s != sizeof(on)) { 929 return VIRTIO_NET_ERR; 930 } 931 932 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 933 n->promisc = on; 934 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 935 n->allmulti = on; 936 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 937 n->alluni = on; 938 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 939 n->nomulti = on; 940 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 941 n->nouni = on; 942 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 943 n->nobcast = on; 944 } else { 945 return VIRTIO_NET_ERR; 946 } 947 948 rxfilter_notify(nc); 949 950 return VIRTIO_NET_OK; 951 } 952 953 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 954 struct iovec *iov, unsigned int iov_cnt) 955 { 956 VirtIODevice *vdev = VIRTIO_DEVICE(n); 957 uint64_t offloads; 958 size_t s; 959 960 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 961 return VIRTIO_NET_ERR; 962 } 963 964 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 965 if (s != sizeof(offloads)) { 966 return VIRTIO_NET_ERR; 967 } 968 969 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 970 uint64_t supported_offloads; 971 972 offloads = virtio_ldq_p(vdev, &offloads); 973 974 if (!n->has_vnet_hdr) { 975 return VIRTIO_NET_ERR; 976 } 977 978 n->rsc4_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) && 979 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO4); 980 n->rsc6_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) && 981 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO6); 982 virtio_clear_feature(&offloads, VIRTIO_NET_F_RSC_EXT); 983 984 supported_offloads = virtio_net_supported_guest_offloads(n); 985 if (offloads & ~supported_offloads) { 986 return VIRTIO_NET_ERR; 987 } 988 989 n->curr_guest_offloads = offloads; 990 virtio_net_apply_guest_offloads(n); 991 992 return VIRTIO_NET_OK; 993 } else { 994 return VIRTIO_NET_ERR; 995 } 996 } 997 998 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 999 struct iovec *iov, unsigned int iov_cnt) 1000 { 1001 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1002 struct virtio_net_ctrl_mac mac_data; 1003 size_t s; 1004 NetClientState *nc = qemu_get_queue(n->nic); 1005 1006 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 1007 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 1008 return VIRTIO_NET_ERR; 1009 } 1010 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 1011 assert(s == sizeof(n->mac)); 1012 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 1013 rxfilter_notify(nc); 1014 1015 return VIRTIO_NET_OK; 1016 } 1017 1018 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 1019 return VIRTIO_NET_ERR; 1020 } 1021 1022 int in_use = 0; 1023 int first_multi = 0; 1024 uint8_t uni_overflow = 0; 1025 uint8_t multi_overflow = 0; 1026 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1027 1028 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 1029 sizeof(mac_data.entries)); 1030 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 1031 if (s != sizeof(mac_data.entries)) { 1032 goto error; 1033 } 1034 iov_discard_front(&iov, &iov_cnt, s); 1035 1036 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 1037 goto error; 1038 } 1039 1040 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 1041 s = iov_to_buf(iov, iov_cnt, 0, macs, 1042 mac_data.entries * ETH_ALEN); 1043 if (s != mac_data.entries * ETH_ALEN) { 1044 goto error; 1045 } 1046 in_use += mac_data.entries; 1047 } else { 1048 uni_overflow = 1; 1049 } 1050 1051 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 1052 1053 first_multi = in_use; 1054 1055 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 1056 sizeof(mac_data.entries)); 1057 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 1058 if (s != sizeof(mac_data.entries)) { 1059 goto error; 1060 } 1061 1062 iov_discard_front(&iov, &iov_cnt, s); 1063 1064 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 1065 goto error; 1066 } 1067 1068 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 1069 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 1070 mac_data.entries * ETH_ALEN); 1071 if (s != mac_data.entries * ETH_ALEN) { 1072 goto error; 1073 } 1074 in_use += mac_data.entries; 1075 } else { 1076 multi_overflow = 1; 1077 } 1078 1079 n->mac_table.in_use = in_use; 1080 n->mac_table.first_multi = first_multi; 1081 n->mac_table.uni_overflow = uni_overflow; 1082 n->mac_table.multi_overflow = multi_overflow; 1083 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 1084 g_free(macs); 1085 rxfilter_notify(nc); 1086 1087 return VIRTIO_NET_OK; 1088 1089 error: 1090 g_free(macs); 1091 return VIRTIO_NET_ERR; 1092 } 1093 1094 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 1095 struct iovec *iov, unsigned int iov_cnt) 1096 { 1097 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1098 uint16_t vid; 1099 size_t s; 1100 NetClientState *nc = qemu_get_queue(n->nic); 1101 1102 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 1103 vid = virtio_lduw_p(vdev, &vid); 1104 if (s != sizeof(vid)) { 1105 return VIRTIO_NET_ERR; 1106 } 1107 1108 if (vid >= MAX_VLAN) 1109 return VIRTIO_NET_ERR; 1110 1111 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 1112 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 1113 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 1114 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 1115 else 1116 return VIRTIO_NET_ERR; 1117 1118 rxfilter_notify(nc); 1119 1120 return VIRTIO_NET_OK; 1121 } 1122 1123 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 1124 struct iovec *iov, unsigned int iov_cnt) 1125 { 1126 trace_virtio_net_handle_announce(n->announce_timer.round); 1127 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 1128 n->status & VIRTIO_NET_S_ANNOUNCE) { 1129 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 1130 if (n->announce_timer.round) { 1131 qemu_announce_timer_step(&n->announce_timer); 1132 } 1133 return VIRTIO_NET_OK; 1134 } else { 1135 return VIRTIO_NET_ERR; 1136 } 1137 } 1138 1139 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 1140 struct iovec *iov, unsigned int iov_cnt) 1141 { 1142 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1143 struct virtio_net_ctrl_mq mq; 1144 size_t s; 1145 uint16_t queues; 1146 1147 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 1148 if (s != sizeof(mq)) { 1149 return VIRTIO_NET_ERR; 1150 } 1151 1152 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 1153 return VIRTIO_NET_ERR; 1154 } 1155 1156 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 1157 1158 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1159 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1160 queues > n->max_queues || 1161 !n->multiqueue) { 1162 return VIRTIO_NET_ERR; 1163 } 1164 1165 n->curr_queues = queues; 1166 /* stop the backend before changing the number of queues to avoid handling a 1167 * disabled queue */ 1168 virtio_net_set_status(vdev, vdev->status); 1169 virtio_net_set_queues(n); 1170 1171 return VIRTIO_NET_OK; 1172 } 1173 1174 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 1175 { 1176 VirtIONet *n = VIRTIO_NET(vdev); 1177 struct virtio_net_ctrl_hdr ctrl; 1178 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 1179 VirtQueueElement *elem; 1180 size_t s; 1181 struct iovec *iov, *iov2; 1182 unsigned int iov_cnt; 1183 1184 for (;;) { 1185 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 1186 if (!elem) { 1187 break; 1188 } 1189 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || 1190 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { 1191 virtio_error(vdev, "virtio-net ctrl missing headers"); 1192 virtqueue_detach_element(vq, elem, 0); 1193 g_free(elem); 1194 break; 1195 } 1196 1197 iov_cnt = elem->out_num; 1198 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); 1199 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 1200 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 1201 if (s != sizeof(ctrl)) { 1202 status = VIRTIO_NET_ERR; 1203 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 1204 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 1205 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 1206 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 1207 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 1208 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 1209 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 1210 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 1211 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 1212 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 1213 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 1214 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 1215 } 1216 1217 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); 1218 assert(s == sizeof(status)); 1219 1220 virtqueue_push(vq, elem, sizeof(status)); 1221 virtio_notify(vdev, vq); 1222 g_free(iov2); 1223 g_free(elem); 1224 } 1225 } 1226 1227 /* RX */ 1228 1229 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 1230 { 1231 VirtIONet *n = VIRTIO_NET(vdev); 1232 int queue_index = vq2q(virtio_get_queue_index(vq)); 1233 1234 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 1235 } 1236 1237 static int virtio_net_can_receive(NetClientState *nc) 1238 { 1239 VirtIONet *n = qemu_get_nic_opaque(nc); 1240 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1241 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1242 1243 if (!vdev->vm_running) { 1244 return 0; 1245 } 1246 1247 if (nc->queue_index >= n->curr_queues) { 1248 return 0; 1249 } 1250 1251 if (!virtio_queue_ready(q->rx_vq) || 1252 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1253 return 0; 1254 } 1255 1256 return 1; 1257 } 1258 1259 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1260 { 1261 VirtIONet *n = q->n; 1262 if (virtio_queue_empty(q->rx_vq) || 1263 (n->mergeable_rx_bufs && 1264 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1265 virtio_queue_set_notification(q->rx_vq, 1); 1266 1267 /* To avoid a race condition where the guest has made some buffers 1268 * available after the above check but before notification was 1269 * enabled, check for available buffers again. 1270 */ 1271 if (virtio_queue_empty(q->rx_vq) || 1272 (n->mergeable_rx_bufs && 1273 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 1274 return 0; 1275 } 1276 } 1277 1278 virtio_queue_set_notification(q->rx_vq, 0); 1279 return 1; 1280 } 1281 1282 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1283 { 1284 virtio_tswap16s(vdev, &hdr->hdr_len); 1285 virtio_tswap16s(vdev, &hdr->gso_size); 1286 virtio_tswap16s(vdev, &hdr->csum_start); 1287 virtio_tswap16s(vdev, &hdr->csum_offset); 1288 } 1289 1290 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1291 * it never finds out that the packets don't have valid checksums. This 1292 * causes dhclient to get upset. Fedora's carried a patch for ages to 1293 * fix this with Xen but it hasn't appeared in an upstream release of 1294 * dhclient yet. 1295 * 1296 * To avoid breaking existing guests, we catch udp packets and add 1297 * checksums. This is terrible but it's better than hacking the guest 1298 * kernels. 1299 * 1300 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1301 * we should provide a mechanism to disable it to avoid polluting the host 1302 * cache. 1303 */ 1304 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1305 uint8_t *buf, size_t size) 1306 { 1307 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1308 (size > 27 && size < 1500) && /* normal sized MTU */ 1309 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1310 (buf[23] == 17) && /* ip.protocol == UDP */ 1311 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1312 net_checksum_calculate(buf, size); 1313 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1314 } 1315 } 1316 1317 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1318 const void *buf, size_t size) 1319 { 1320 if (n->has_vnet_hdr) { 1321 /* FIXME this cast is evil */ 1322 void *wbuf = (void *)buf; 1323 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1324 size - n->host_hdr_len); 1325 1326 if (n->needs_vnet_hdr_swap) { 1327 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1328 } 1329 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1330 } else { 1331 struct virtio_net_hdr hdr = { 1332 .flags = 0, 1333 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1334 }; 1335 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1336 } 1337 } 1338 1339 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1340 { 1341 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1342 static const uint8_t vlan[] = {0x81, 0x00}; 1343 uint8_t *ptr = (uint8_t *)buf; 1344 int i; 1345 1346 if (n->promisc) 1347 return 1; 1348 1349 ptr += n->host_hdr_len; 1350 1351 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1352 int vid = lduw_be_p(ptr + 14) & 0xfff; 1353 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1354 return 0; 1355 } 1356 1357 if (ptr[0] & 1) { // multicast 1358 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1359 return !n->nobcast; 1360 } else if (n->nomulti) { 1361 return 0; 1362 } else if (n->allmulti || n->mac_table.multi_overflow) { 1363 return 1; 1364 } 1365 1366 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1367 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1368 return 1; 1369 } 1370 } 1371 } else { // unicast 1372 if (n->nouni) { 1373 return 0; 1374 } else if (n->alluni || n->mac_table.uni_overflow) { 1375 return 1; 1376 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1377 return 1; 1378 } 1379 1380 for (i = 0; i < n->mac_table.first_multi; i++) { 1381 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1382 return 1; 1383 } 1384 } 1385 } 1386 1387 return 0; 1388 } 1389 1390 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1391 size_t size) 1392 { 1393 VirtIONet *n = qemu_get_nic_opaque(nc); 1394 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1395 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1396 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1397 struct virtio_net_hdr_mrg_rxbuf mhdr; 1398 unsigned mhdr_cnt = 0; 1399 size_t offset, i, guest_offset; 1400 1401 if (!virtio_net_can_receive(nc)) { 1402 return -1; 1403 } 1404 1405 /* hdr_len refers to the header we supply to the guest */ 1406 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1407 return 0; 1408 } 1409 1410 if (!receive_filter(n, buf, size)) 1411 return size; 1412 1413 offset = i = 0; 1414 1415 while (offset < size) { 1416 VirtQueueElement *elem; 1417 int len, total; 1418 const struct iovec *sg; 1419 1420 total = 0; 1421 1422 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1423 if (!elem) { 1424 if (i) { 1425 virtio_error(vdev, "virtio-net unexpected empty queue: " 1426 "i %zd mergeable %d offset %zd, size %zd, " 1427 "guest hdr len %zd, host hdr len %zd " 1428 "guest features 0x%" PRIx64, 1429 i, n->mergeable_rx_bufs, offset, size, 1430 n->guest_hdr_len, n->host_hdr_len, 1431 vdev->guest_features); 1432 } 1433 return -1; 1434 } 1435 1436 if (elem->in_num < 1) { 1437 virtio_error(vdev, 1438 "virtio-net receive queue contains no in buffers"); 1439 virtqueue_detach_element(q->rx_vq, elem, 0); 1440 g_free(elem); 1441 return -1; 1442 } 1443 1444 sg = elem->in_sg; 1445 if (i == 0) { 1446 assert(offset == 0); 1447 if (n->mergeable_rx_bufs) { 1448 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1449 sg, elem->in_num, 1450 offsetof(typeof(mhdr), num_buffers), 1451 sizeof(mhdr.num_buffers)); 1452 } 1453 1454 receive_header(n, sg, elem->in_num, buf, size); 1455 offset = n->host_hdr_len; 1456 total += n->guest_hdr_len; 1457 guest_offset = n->guest_hdr_len; 1458 } else { 1459 guest_offset = 0; 1460 } 1461 1462 /* copy in packet. ugh */ 1463 len = iov_from_buf(sg, elem->in_num, guest_offset, 1464 buf + offset, size - offset); 1465 total += len; 1466 offset += len; 1467 /* If buffers can't be merged, at this point we 1468 * must have consumed the complete packet. 1469 * Otherwise, drop it. */ 1470 if (!n->mergeable_rx_bufs && offset < size) { 1471 virtqueue_unpop(q->rx_vq, elem, total); 1472 g_free(elem); 1473 return size; 1474 } 1475 1476 /* signal other side */ 1477 virtqueue_fill(q->rx_vq, elem, total, i++); 1478 g_free(elem); 1479 } 1480 1481 if (mhdr_cnt) { 1482 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1483 iov_from_buf(mhdr_sg, mhdr_cnt, 1484 0, 1485 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1486 } 1487 1488 virtqueue_flush(q->rx_vq, i); 1489 virtio_notify(vdev, q->rx_vq); 1490 1491 return size; 1492 } 1493 1494 static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf, 1495 size_t size) 1496 { 1497 RCU_READ_LOCK_GUARD(); 1498 1499 return virtio_net_receive_rcu(nc, buf, size); 1500 } 1501 1502 static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain, 1503 const uint8_t *buf, 1504 VirtioNetRscUnit *unit) 1505 { 1506 uint16_t ip_hdrlen; 1507 struct ip_header *ip; 1508 1509 ip = (struct ip_header *)(buf + chain->n->guest_hdr_len 1510 + sizeof(struct eth_header)); 1511 unit->ip = (void *)ip; 1512 ip_hdrlen = (ip->ip_ver_len & 0xF) << 2; 1513 unit->ip_plen = &ip->ip_len; 1514 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen); 1515 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 1516 unit->payload = htons(*unit->ip_plen) - ip_hdrlen - unit->tcp_hdrlen; 1517 } 1518 1519 static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain, 1520 const uint8_t *buf, 1521 VirtioNetRscUnit *unit) 1522 { 1523 struct ip6_header *ip6; 1524 1525 ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len 1526 + sizeof(struct eth_header)); 1527 unit->ip = ip6; 1528 unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 1529 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip)\ 1530 + sizeof(struct ip6_header)); 1531 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 1532 1533 /* There is a difference between payload lenght in ipv4 and v6, 1534 ip header is excluded in ipv6 */ 1535 unit->payload = htons(*unit->ip_plen) - unit->tcp_hdrlen; 1536 } 1537 1538 static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain, 1539 VirtioNetRscSeg *seg) 1540 { 1541 int ret; 1542 struct virtio_net_hdr *h; 1543 1544 h = (struct virtio_net_hdr *)seg->buf; 1545 h->flags = 0; 1546 h->gso_type = VIRTIO_NET_HDR_GSO_NONE; 1547 1548 if (seg->is_coalesced) { 1549 *virtio_net_rsc_ext_num_packets(h) = seg->packets; 1550 *virtio_net_rsc_ext_num_dupacks(h) = seg->dup_ack; 1551 h->flags = VIRTIO_NET_HDR_F_RSC_INFO; 1552 if (chain->proto == ETH_P_IP) { 1553 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 1554 } else { 1555 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 1556 } 1557 } 1558 1559 ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size); 1560 QTAILQ_REMOVE(&chain->buffers, seg, next); 1561 g_free(seg->buf); 1562 g_free(seg); 1563 1564 return ret; 1565 } 1566 1567 static void virtio_net_rsc_purge(void *opq) 1568 { 1569 VirtioNetRscSeg *seg, *rn; 1570 VirtioNetRscChain *chain = (VirtioNetRscChain *)opq; 1571 1572 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) { 1573 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 1574 chain->stat.purge_failed++; 1575 continue; 1576 } 1577 } 1578 1579 chain->stat.timer++; 1580 if (!QTAILQ_EMPTY(&chain->buffers)) { 1581 timer_mod(chain->drain_timer, 1582 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout); 1583 } 1584 } 1585 1586 static void virtio_net_rsc_cleanup(VirtIONet *n) 1587 { 1588 VirtioNetRscChain *chain, *rn_chain; 1589 VirtioNetRscSeg *seg, *rn_seg; 1590 1591 QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) { 1592 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) { 1593 QTAILQ_REMOVE(&chain->buffers, seg, next); 1594 g_free(seg->buf); 1595 g_free(seg); 1596 } 1597 1598 timer_del(chain->drain_timer); 1599 timer_free(chain->drain_timer); 1600 QTAILQ_REMOVE(&n->rsc_chains, chain, next); 1601 g_free(chain); 1602 } 1603 } 1604 1605 static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain, 1606 NetClientState *nc, 1607 const uint8_t *buf, size_t size) 1608 { 1609 uint16_t hdr_len; 1610 VirtioNetRscSeg *seg; 1611 1612 hdr_len = chain->n->guest_hdr_len; 1613 seg = g_malloc(sizeof(VirtioNetRscSeg)); 1614 seg->buf = g_malloc(hdr_len + sizeof(struct eth_header) 1615 + sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD); 1616 memcpy(seg->buf, buf, size); 1617 seg->size = size; 1618 seg->packets = 1; 1619 seg->dup_ack = 0; 1620 seg->is_coalesced = 0; 1621 seg->nc = nc; 1622 1623 QTAILQ_INSERT_TAIL(&chain->buffers, seg, next); 1624 chain->stat.cache++; 1625 1626 switch (chain->proto) { 1627 case ETH_P_IP: 1628 virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit); 1629 break; 1630 case ETH_P_IPV6: 1631 virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit); 1632 break; 1633 default: 1634 g_assert_not_reached(); 1635 } 1636 } 1637 1638 static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain, 1639 VirtioNetRscSeg *seg, 1640 const uint8_t *buf, 1641 struct tcp_header *n_tcp, 1642 struct tcp_header *o_tcp) 1643 { 1644 uint32_t nack, oack; 1645 uint16_t nwin, owin; 1646 1647 nack = htonl(n_tcp->th_ack); 1648 nwin = htons(n_tcp->th_win); 1649 oack = htonl(o_tcp->th_ack); 1650 owin = htons(o_tcp->th_win); 1651 1652 if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) { 1653 chain->stat.ack_out_of_win++; 1654 return RSC_FINAL; 1655 } else if (nack == oack) { 1656 /* duplicated ack or window probe */ 1657 if (nwin == owin) { 1658 /* duplicated ack, add dup ack count due to whql test up to 1 */ 1659 chain->stat.dup_ack++; 1660 return RSC_FINAL; 1661 } else { 1662 /* Coalesce window update */ 1663 o_tcp->th_win = n_tcp->th_win; 1664 chain->stat.win_update++; 1665 return RSC_COALESCE; 1666 } 1667 } else { 1668 /* pure ack, go to 'C', finalize*/ 1669 chain->stat.pure_ack++; 1670 return RSC_FINAL; 1671 } 1672 } 1673 1674 static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain, 1675 VirtioNetRscSeg *seg, 1676 const uint8_t *buf, 1677 VirtioNetRscUnit *n_unit) 1678 { 1679 void *data; 1680 uint16_t o_ip_len; 1681 uint32_t nseq, oseq; 1682 VirtioNetRscUnit *o_unit; 1683 1684 o_unit = &seg->unit; 1685 o_ip_len = htons(*o_unit->ip_plen); 1686 nseq = htonl(n_unit->tcp->th_seq); 1687 oseq = htonl(o_unit->tcp->th_seq); 1688 1689 /* out of order or retransmitted. */ 1690 if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) { 1691 chain->stat.data_out_of_win++; 1692 return RSC_FINAL; 1693 } 1694 1695 data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen; 1696 if (nseq == oseq) { 1697 if ((o_unit->payload == 0) && n_unit->payload) { 1698 /* From no payload to payload, normal case, not a dup ack or etc */ 1699 chain->stat.data_after_pure_ack++; 1700 goto coalesce; 1701 } else { 1702 return virtio_net_rsc_handle_ack(chain, seg, buf, 1703 n_unit->tcp, o_unit->tcp); 1704 } 1705 } else if ((nseq - oseq) != o_unit->payload) { 1706 /* Not a consistent packet, out of order */ 1707 chain->stat.data_out_of_order++; 1708 return RSC_FINAL; 1709 } else { 1710 coalesce: 1711 if ((o_ip_len + n_unit->payload) > chain->max_payload) { 1712 chain->stat.over_size++; 1713 return RSC_FINAL; 1714 } 1715 1716 /* Here comes the right data, the payload length in v4/v6 is different, 1717 so use the field value to update and record the new data len */ 1718 o_unit->payload += n_unit->payload; /* update new data len */ 1719 1720 /* update field in ip header */ 1721 *o_unit->ip_plen = htons(o_ip_len + n_unit->payload); 1722 1723 /* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced 1724 for windows guest, while this may change the behavior for linux 1725 guest (only if it uses RSC feature). */ 1726 o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags; 1727 1728 o_unit->tcp->th_ack = n_unit->tcp->th_ack; 1729 o_unit->tcp->th_win = n_unit->tcp->th_win; 1730 1731 memmove(seg->buf + seg->size, data, n_unit->payload); 1732 seg->size += n_unit->payload; 1733 seg->packets++; 1734 chain->stat.coalesced++; 1735 return RSC_COALESCE; 1736 } 1737 } 1738 1739 static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain, 1740 VirtioNetRscSeg *seg, 1741 const uint8_t *buf, size_t size, 1742 VirtioNetRscUnit *unit) 1743 { 1744 struct ip_header *ip1, *ip2; 1745 1746 ip1 = (struct ip_header *)(unit->ip); 1747 ip2 = (struct ip_header *)(seg->unit.ip); 1748 if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst) 1749 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 1750 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 1751 chain->stat.no_match++; 1752 return RSC_NO_MATCH; 1753 } 1754 1755 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 1756 } 1757 1758 static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain, 1759 VirtioNetRscSeg *seg, 1760 const uint8_t *buf, size_t size, 1761 VirtioNetRscUnit *unit) 1762 { 1763 struct ip6_header *ip1, *ip2; 1764 1765 ip1 = (struct ip6_header *)(unit->ip); 1766 ip2 = (struct ip6_header *)(seg->unit.ip); 1767 if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address)) 1768 || memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address)) 1769 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 1770 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 1771 chain->stat.no_match++; 1772 return RSC_NO_MATCH; 1773 } 1774 1775 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 1776 } 1777 1778 /* Packets with 'SYN' should bypass, other flag should be sent after drain 1779 * to prevent out of order */ 1780 static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain, 1781 struct tcp_header *tcp) 1782 { 1783 uint16_t tcp_hdr; 1784 uint16_t tcp_flag; 1785 1786 tcp_flag = htons(tcp->th_offset_flags); 1787 tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10; 1788 tcp_flag &= VIRTIO_NET_TCP_FLAG; 1789 tcp_flag = htons(tcp->th_offset_flags) & 0x3F; 1790 if (tcp_flag & TH_SYN) { 1791 chain->stat.tcp_syn++; 1792 return RSC_BYPASS; 1793 } 1794 1795 if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) { 1796 chain->stat.tcp_ctrl_drain++; 1797 return RSC_FINAL; 1798 } 1799 1800 if (tcp_hdr > sizeof(struct tcp_header)) { 1801 chain->stat.tcp_all_opt++; 1802 return RSC_FINAL; 1803 } 1804 1805 return RSC_CANDIDATE; 1806 } 1807 1808 static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain, 1809 NetClientState *nc, 1810 const uint8_t *buf, size_t size, 1811 VirtioNetRscUnit *unit) 1812 { 1813 int ret; 1814 VirtioNetRscSeg *seg, *nseg; 1815 1816 if (QTAILQ_EMPTY(&chain->buffers)) { 1817 chain->stat.empty_cache++; 1818 virtio_net_rsc_cache_buf(chain, nc, buf, size); 1819 timer_mod(chain->drain_timer, 1820 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout); 1821 return size; 1822 } 1823 1824 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 1825 if (chain->proto == ETH_P_IP) { 1826 ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit); 1827 } else { 1828 ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit); 1829 } 1830 1831 if (ret == RSC_FINAL) { 1832 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 1833 /* Send failed */ 1834 chain->stat.final_failed++; 1835 return 0; 1836 } 1837 1838 /* Send current packet */ 1839 return virtio_net_do_receive(nc, buf, size); 1840 } else if (ret == RSC_NO_MATCH) { 1841 continue; 1842 } else { 1843 /* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */ 1844 seg->is_coalesced = 1; 1845 return size; 1846 } 1847 } 1848 1849 chain->stat.no_match_cache++; 1850 virtio_net_rsc_cache_buf(chain, nc, buf, size); 1851 return size; 1852 } 1853 1854 /* Drain a connection data, this is to avoid out of order segments */ 1855 static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain, 1856 NetClientState *nc, 1857 const uint8_t *buf, size_t size, 1858 uint16_t ip_start, uint16_t ip_size, 1859 uint16_t tcp_port) 1860 { 1861 VirtioNetRscSeg *seg, *nseg; 1862 uint32_t ppair1, ppair2; 1863 1864 ppair1 = *(uint32_t *)(buf + tcp_port); 1865 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 1866 ppair2 = *(uint32_t *)(seg->buf + tcp_port); 1867 if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size) 1868 || (ppair1 != ppair2)) { 1869 continue; 1870 } 1871 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 1872 chain->stat.drain_failed++; 1873 } 1874 1875 break; 1876 } 1877 1878 return virtio_net_do_receive(nc, buf, size); 1879 } 1880 1881 static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain, 1882 struct ip_header *ip, 1883 const uint8_t *buf, size_t size) 1884 { 1885 uint16_t ip_len; 1886 1887 /* Not an ipv4 packet */ 1888 if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) { 1889 chain->stat.ip_option++; 1890 return RSC_BYPASS; 1891 } 1892 1893 /* Don't handle packets with ip option */ 1894 if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) { 1895 chain->stat.ip_option++; 1896 return RSC_BYPASS; 1897 } 1898 1899 if (ip->ip_p != IPPROTO_TCP) { 1900 chain->stat.bypass_not_tcp++; 1901 return RSC_BYPASS; 1902 } 1903 1904 /* Don't handle packets with ip fragment */ 1905 if (!(htons(ip->ip_off) & IP_DF)) { 1906 chain->stat.ip_frag++; 1907 return RSC_BYPASS; 1908 } 1909 1910 /* Don't handle packets with ecn flag */ 1911 if (IPTOS_ECN(ip->ip_tos)) { 1912 chain->stat.ip_ecn++; 1913 return RSC_BYPASS; 1914 } 1915 1916 ip_len = htons(ip->ip_len); 1917 if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header)) 1918 || ip_len > (size - chain->n->guest_hdr_len - 1919 sizeof(struct eth_header))) { 1920 chain->stat.ip_hacked++; 1921 return RSC_BYPASS; 1922 } 1923 1924 return RSC_CANDIDATE; 1925 } 1926 1927 static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain, 1928 NetClientState *nc, 1929 const uint8_t *buf, size_t size) 1930 { 1931 int32_t ret; 1932 uint16_t hdr_len; 1933 VirtioNetRscUnit unit; 1934 1935 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 1936 1937 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header) 1938 + sizeof(struct tcp_header))) { 1939 chain->stat.bypass_not_tcp++; 1940 return virtio_net_do_receive(nc, buf, size); 1941 } 1942 1943 virtio_net_rsc_extract_unit4(chain, buf, &unit); 1944 if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size) 1945 != RSC_CANDIDATE) { 1946 return virtio_net_do_receive(nc, buf, size); 1947 } 1948 1949 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 1950 if (ret == RSC_BYPASS) { 1951 return virtio_net_do_receive(nc, buf, size); 1952 } else if (ret == RSC_FINAL) { 1953 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 1954 ((hdr_len + sizeof(struct eth_header)) + 12), 1955 VIRTIO_NET_IP4_ADDR_SIZE, 1956 hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)); 1957 } 1958 1959 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 1960 } 1961 1962 static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain, 1963 struct ip6_header *ip6, 1964 const uint8_t *buf, size_t size) 1965 { 1966 uint16_t ip_len; 1967 1968 if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4) 1969 != IP_HEADER_VERSION_6) { 1970 return RSC_BYPASS; 1971 } 1972 1973 /* Both option and protocol is checked in this */ 1974 if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) { 1975 chain->stat.bypass_not_tcp++; 1976 return RSC_BYPASS; 1977 } 1978 1979 ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 1980 if (ip_len < sizeof(struct tcp_header) || 1981 ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header) 1982 - sizeof(struct ip6_header))) { 1983 chain->stat.ip_hacked++; 1984 return RSC_BYPASS; 1985 } 1986 1987 /* Don't handle packets with ecn flag */ 1988 if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) { 1989 chain->stat.ip_ecn++; 1990 return RSC_BYPASS; 1991 } 1992 1993 return RSC_CANDIDATE; 1994 } 1995 1996 static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc, 1997 const uint8_t *buf, size_t size) 1998 { 1999 int32_t ret; 2000 uint16_t hdr_len; 2001 VirtioNetRscChain *chain; 2002 VirtioNetRscUnit unit; 2003 2004 chain = (VirtioNetRscChain *)opq; 2005 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 2006 2007 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header) 2008 + sizeof(tcp_header))) { 2009 return virtio_net_do_receive(nc, buf, size); 2010 } 2011 2012 virtio_net_rsc_extract_unit6(chain, buf, &unit); 2013 if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain, 2014 unit.ip, buf, size)) { 2015 return virtio_net_do_receive(nc, buf, size); 2016 } 2017 2018 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 2019 if (ret == RSC_BYPASS) { 2020 return virtio_net_do_receive(nc, buf, size); 2021 } else if (ret == RSC_FINAL) { 2022 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 2023 ((hdr_len + sizeof(struct eth_header)) + 8), 2024 VIRTIO_NET_IP6_ADDR_SIZE, 2025 hdr_len + sizeof(struct eth_header) 2026 + sizeof(struct ip6_header)); 2027 } 2028 2029 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 2030 } 2031 2032 static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n, 2033 NetClientState *nc, 2034 uint16_t proto) 2035 { 2036 VirtioNetRscChain *chain; 2037 2038 if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) { 2039 return NULL; 2040 } 2041 2042 QTAILQ_FOREACH(chain, &n->rsc_chains, next) { 2043 if (chain->proto == proto) { 2044 return chain; 2045 } 2046 } 2047 2048 chain = g_malloc(sizeof(*chain)); 2049 chain->n = n; 2050 chain->proto = proto; 2051 if (proto == (uint16_t)ETH_P_IP) { 2052 chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD; 2053 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 2054 } else { 2055 chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD; 2056 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 2057 } 2058 chain->drain_timer = timer_new_ns(QEMU_CLOCK_HOST, 2059 virtio_net_rsc_purge, chain); 2060 memset(&chain->stat, 0, sizeof(chain->stat)); 2061 2062 QTAILQ_INIT(&chain->buffers); 2063 QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next); 2064 2065 return chain; 2066 } 2067 2068 static ssize_t virtio_net_rsc_receive(NetClientState *nc, 2069 const uint8_t *buf, 2070 size_t size) 2071 { 2072 uint16_t proto; 2073 VirtioNetRscChain *chain; 2074 struct eth_header *eth; 2075 VirtIONet *n; 2076 2077 n = qemu_get_nic_opaque(nc); 2078 if (size < (n->host_hdr_len + sizeof(struct eth_header))) { 2079 return virtio_net_do_receive(nc, buf, size); 2080 } 2081 2082 eth = (struct eth_header *)(buf + n->guest_hdr_len); 2083 proto = htons(eth->h_proto); 2084 2085 chain = virtio_net_rsc_lookup_chain(n, nc, proto); 2086 if (chain) { 2087 chain->stat.received++; 2088 if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) { 2089 return virtio_net_rsc_receive4(chain, nc, buf, size); 2090 } else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) { 2091 return virtio_net_rsc_receive6(chain, nc, buf, size); 2092 } 2093 } 2094 return virtio_net_do_receive(nc, buf, size); 2095 } 2096 2097 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 2098 size_t size) 2099 { 2100 VirtIONet *n = qemu_get_nic_opaque(nc); 2101 if ((n->rsc4_enabled || n->rsc6_enabled)) { 2102 return virtio_net_rsc_receive(nc, buf, size); 2103 } else { 2104 return virtio_net_do_receive(nc, buf, size); 2105 } 2106 } 2107 2108 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 2109 2110 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 2111 { 2112 VirtIONet *n = qemu_get_nic_opaque(nc); 2113 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 2114 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2115 2116 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 2117 virtio_notify(vdev, q->tx_vq); 2118 2119 g_free(q->async_tx.elem); 2120 q->async_tx.elem = NULL; 2121 2122 virtio_queue_set_notification(q->tx_vq, 1); 2123 virtio_net_flush_tx(q); 2124 } 2125 2126 /* TX */ 2127 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 2128 { 2129 VirtIONet *n = q->n; 2130 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2131 VirtQueueElement *elem; 2132 int32_t num_packets = 0; 2133 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 2134 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2135 return num_packets; 2136 } 2137 2138 if (q->async_tx.elem) { 2139 virtio_queue_set_notification(q->tx_vq, 0); 2140 return num_packets; 2141 } 2142 2143 for (;;) { 2144 ssize_t ret; 2145 unsigned int out_num; 2146 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 2147 struct virtio_net_hdr_mrg_rxbuf mhdr; 2148 2149 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 2150 if (!elem) { 2151 break; 2152 } 2153 2154 out_num = elem->out_num; 2155 out_sg = elem->out_sg; 2156 if (out_num < 1) { 2157 virtio_error(vdev, "virtio-net header not in first element"); 2158 virtqueue_detach_element(q->tx_vq, elem, 0); 2159 g_free(elem); 2160 return -EINVAL; 2161 } 2162 2163 if (n->has_vnet_hdr) { 2164 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < 2165 n->guest_hdr_len) { 2166 virtio_error(vdev, "virtio-net header incorrect"); 2167 virtqueue_detach_element(q->tx_vq, elem, 0); 2168 g_free(elem); 2169 return -EINVAL; 2170 } 2171 if (n->needs_vnet_hdr_swap) { 2172 virtio_net_hdr_swap(vdev, (void *) &mhdr); 2173 sg2[0].iov_base = &mhdr; 2174 sg2[0].iov_len = n->guest_hdr_len; 2175 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, 2176 out_sg, out_num, 2177 n->guest_hdr_len, -1); 2178 if (out_num == VIRTQUEUE_MAX_SIZE) { 2179 goto drop; 2180 } 2181 out_num += 1; 2182 out_sg = sg2; 2183 } 2184 } 2185 /* 2186 * If host wants to see the guest header as is, we can 2187 * pass it on unchanged. Otherwise, copy just the parts 2188 * that host is interested in. 2189 */ 2190 assert(n->host_hdr_len <= n->guest_hdr_len); 2191 if (n->host_hdr_len != n->guest_hdr_len) { 2192 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 2193 out_sg, out_num, 2194 0, n->host_hdr_len); 2195 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 2196 out_sg, out_num, 2197 n->guest_hdr_len, -1); 2198 out_num = sg_num; 2199 out_sg = sg; 2200 } 2201 2202 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 2203 out_sg, out_num, virtio_net_tx_complete); 2204 if (ret == 0) { 2205 virtio_queue_set_notification(q->tx_vq, 0); 2206 q->async_tx.elem = elem; 2207 return -EBUSY; 2208 } 2209 2210 drop: 2211 virtqueue_push(q->tx_vq, elem, 0); 2212 virtio_notify(vdev, q->tx_vq); 2213 g_free(elem); 2214 2215 if (++num_packets >= n->tx_burst) { 2216 break; 2217 } 2218 } 2219 return num_packets; 2220 } 2221 2222 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 2223 { 2224 VirtIONet *n = VIRTIO_NET(vdev); 2225 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2226 2227 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2228 virtio_net_drop_tx_queue_data(vdev, vq); 2229 return; 2230 } 2231 2232 /* This happens when device was stopped but VCPU wasn't. */ 2233 if (!vdev->vm_running) { 2234 q->tx_waiting = 1; 2235 return; 2236 } 2237 2238 if (q->tx_waiting) { 2239 virtio_queue_set_notification(vq, 1); 2240 timer_del(q->tx_timer); 2241 q->tx_waiting = 0; 2242 if (virtio_net_flush_tx(q) == -EINVAL) { 2243 return; 2244 } 2245 } else { 2246 timer_mod(q->tx_timer, 2247 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2248 q->tx_waiting = 1; 2249 virtio_queue_set_notification(vq, 0); 2250 } 2251 } 2252 2253 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 2254 { 2255 VirtIONet *n = VIRTIO_NET(vdev); 2256 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2257 2258 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2259 virtio_net_drop_tx_queue_data(vdev, vq); 2260 return; 2261 } 2262 2263 if (unlikely(q->tx_waiting)) { 2264 return; 2265 } 2266 q->tx_waiting = 1; 2267 /* This happens when device was stopped but VCPU wasn't. */ 2268 if (!vdev->vm_running) { 2269 return; 2270 } 2271 virtio_queue_set_notification(vq, 0); 2272 qemu_bh_schedule(q->tx_bh); 2273 } 2274 2275 static void virtio_net_tx_timer(void *opaque) 2276 { 2277 VirtIONetQueue *q = opaque; 2278 VirtIONet *n = q->n; 2279 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2280 /* This happens when device was stopped but BH wasn't. */ 2281 if (!vdev->vm_running) { 2282 /* Make sure tx waiting is set, so we'll run when restarted. */ 2283 assert(q->tx_waiting); 2284 return; 2285 } 2286 2287 q->tx_waiting = 0; 2288 2289 /* Just in case the driver is not ready on more */ 2290 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2291 return; 2292 } 2293 2294 virtio_queue_set_notification(q->tx_vq, 1); 2295 virtio_net_flush_tx(q); 2296 } 2297 2298 static void virtio_net_tx_bh(void *opaque) 2299 { 2300 VirtIONetQueue *q = opaque; 2301 VirtIONet *n = q->n; 2302 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2303 int32_t ret; 2304 2305 /* This happens when device was stopped but BH wasn't. */ 2306 if (!vdev->vm_running) { 2307 /* Make sure tx waiting is set, so we'll run when restarted. */ 2308 assert(q->tx_waiting); 2309 return; 2310 } 2311 2312 q->tx_waiting = 0; 2313 2314 /* Just in case the driver is not ready on more */ 2315 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 2316 return; 2317 } 2318 2319 ret = virtio_net_flush_tx(q); 2320 if (ret == -EBUSY || ret == -EINVAL) { 2321 return; /* Notification re-enable handled by tx_complete or device 2322 * broken */ 2323 } 2324 2325 /* If we flush a full burst of packets, assume there are 2326 * more coming and immediately reschedule */ 2327 if (ret >= n->tx_burst) { 2328 qemu_bh_schedule(q->tx_bh); 2329 q->tx_waiting = 1; 2330 return; 2331 } 2332 2333 /* If less than a full burst, re-enable notification and flush 2334 * anything that may have come in while we weren't looking. If 2335 * we find something, assume the guest is still active and reschedule */ 2336 virtio_queue_set_notification(q->tx_vq, 1); 2337 ret = virtio_net_flush_tx(q); 2338 if (ret == -EINVAL) { 2339 return; 2340 } else if (ret > 0) { 2341 virtio_queue_set_notification(q->tx_vq, 0); 2342 qemu_bh_schedule(q->tx_bh); 2343 q->tx_waiting = 1; 2344 } 2345 } 2346 2347 static void virtio_net_add_queue(VirtIONet *n, int index) 2348 { 2349 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2350 2351 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 2352 virtio_net_handle_rx); 2353 2354 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 2355 n->vqs[index].tx_vq = 2356 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 2357 virtio_net_handle_tx_timer); 2358 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 2359 virtio_net_tx_timer, 2360 &n->vqs[index]); 2361 } else { 2362 n->vqs[index].tx_vq = 2363 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 2364 virtio_net_handle_tx_bh); 2365 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); 2366 } 2367 2368 n->vqs[index].tx_waiting = 0; 2369 n->vqs[index].n = n; 2370 } 2371 2372 static void virtio_net_del_queue(VirtIONet *n, int index) 2373 { 2374 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2375 VirtIONetQueue *q = &n->vqs[index]; 2376 NetClientState *nc = qemu_get_subqueue(n->nic, index); 2377 2378 qemu_purge_queued_packets(nc); 2379 2380 virtio_del_queue(vdev, index * 2); 2381 if (q->tx_timer) { 2382 timer_del(q->tx_timer); 2383 timer_free(q->tx_timer); 2384 q->tx_timer = NULL; 2385 } else { 2386 qemu_bh_delete(q->tx_bh); 2387 q->tx_bh = NULL; 2388 } 2389 q->tx_waiting = 0; 2390 virtio_del_queue(vdev, index * 2 + 1); 2391 } 2392 2393 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) 2394 { 2395 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2396 int old_num_queues = virtio_get_num_queues(vdev); 2397 int new_num_queues = new_max_queues * 2 + 1; 2398 int i; 2399 2400 assert(old_num_queues >= 3); 2401 assert(old_num_queues % 2 == 1); 2402 2403 if (old_num_queues == new_num_queues) { 2404 return; 2405 } 2406 2407 /* 2408 * We always need to remove and add ctrl vq if 2409 * old_num_queues != new_num_queues. Remove ctrl_vq first, 2410 * and then we only enter one of the following two loops. 2411 */ 2412 virtio_del_queue(vdev, old_num_queues - 1); 2413 2414 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 2415 /* new_num_queues < old_num_queues */ 2416 virtio_net_del_queue(n, i / 2); 2417 } 2418 2419 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 2420 /* new_num_queues > old_num_queues */ 2421 virtio_net_add_queue(n, i / 2); 2422 } 2423 2424 /* add ctrl_vq last */ 2425 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 2426 } 2427 2428 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 2429 { 2430 int max = multiqueue ? n->max_queues : 1; 2431 2432 n->multiqueue = multiqueue; 2433 virtio_net_change_num_queues(n, max); 2434 2435 virtio_net_set_queues(n); 2436 } 2437 2438 static int virtio_net_post_load_device(void *opaque, int version_id) 2439 { 2440 VirtIONet *n = opaque; 2441 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2442 int i, link_down; 2443 2444 trace_virtio_net_post_load_device(); 2445 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 2446 virtio_vdev_has_feature(vdev, 2447 VIRTIO_F_VERSION_1)); 2448 2449 /* MAC_TABLE_ENTRIES may be different from the saved image */ 2450 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 2451 n->mac_table.in_use = 0; 2452 } 2453 2454 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 2455 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 2456 } 2457 2458 /* 2459 * curr_guest_offloads will be later overwritten by the 2460 * virtio_set_features_nocheck call done from the virtio_load. 2461 * Here we make sure it is preserved and restored accordingly 2462 * in the virtio_net_post_load_virtio callback. 2463 */ 2464 n->saved_guest_offloads = n->curr_guest_offloads; 2465 2466 virtio_net_set_queues(n); 2467 2468 /* Find the first multicast entry in the saved MAC filter */ 2469 for (i = 0; i < n->mac_table.in_use; i++) { 2470 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 2471 break; 2472 } 2473 } 2474 n->mac_table.first_multi = i; 2475 2476 /* nc.link_down can't be migrated, so infer link_down according 2477 * to link status bit in n->status */ 2478 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 2479 for (i = 0; i < n->max_queues; i++) { 2480 qemu_get_subqueue(n->nic, i)->link_down = link_down; 2481 } 2482 2483 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 2484 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 2485 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 2486 QEMU_CLOCK_VIRTUAL, 2487 virtio_net_announce_timer, n); 2488 if (n->announce_timer.round) { 2489 timer_mod(n->announce_timer.tm, 2490 qemu_clock_get_ms(n->announce_timer.type)); 2491 } else { 2492 qemu_announce_timer_del(&n->announce_timer, false); 2493 } 2494 } 2495 2496 return 0; 2497 } 2498 2499 static int virtio_net_post_load_virtio(VirtIODevice *vdev) 2500 { 2501 VirtIONet *n = VIRTIO_NET(vdev); 2502 /* 2503 * The actual needed state is now in saved_guest_offloads, 2504 * see virtio_net_post_load_device for detail. 2505 * Restore it back and apply the desired offloads. 2506 */ 2507 n->curr_guest_offloads = n->saved_guest_offloads; 2508 if (peer_has_vnet_hdr(n)) { 2509 virtio_net_apply_guest_offloads(n); 2510 } 2511 2512 return 0; 2513 } 2514 2515 /* tx_waiting field of a VirtIONetQueue */ 2516 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 2517 .name = "virtio-net-queue-tx_waiting", 2518 .fields = (VMStateField[]) { 2519 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 2520 VMSTATE_END_OF_LIST() 2521 }, 2522 }; 2523 2524 static bool max_queues_gt_1(void *opaque, int version_id) 2525 { 2526 return VIRTIO_NET(opaque)->max_queues > 1; 2527 } 2528 2529 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 2530 { 2531 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 2532 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 2533 } 2534 2535 static bool mac_table_fits(void *opaque, int version_id) 2536 { 2537 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 2538 } 2539 2540 static bool mac_table_doesnt_fit(void *opaque, int version_id) 2541 { 2542 return !mac_table_fits(opaque, version_id); 2543 } 2544 2545 /* This temporary type is shared by all the WITH_TMP methods 2546 * although only some fields are used by each. 2547 */ 2548 struct VirtIONetMigTmp { 2549 VirtIONet *parent; 2550 VirtIONetQueue *vqs_1; 2551 uint16_t curr_queues_1; 2552 uint8_t has_ufo; 2553 uint32_t has_vnet_hdr; 2554 }; 2555 2556 /* The 2nd and subsequent tx_waiting flags are loaded later than 2557 * the 1st entry in the queues and only if there's more than one 2558 * entry. We use the tmp mechanism to calculate a temporary 2559 * pointer and count and also validate the count. 2560 */ 2561 2562 static int virtio_net_tx_waiting_pre_save(void *opaque) 2563 { 2564 struct VirtIONetMigTmp *tmp = opaque; 2565 2566 tmp->vqs_1 = tmp->parent->vqs + 1; 2567 tmp->curr_queues_1 = tmp->parent->curr_queues - 1; 2568 if (tmp->parent->curr_queues == 0) { 2569 tmp->curr_queues_1 = 0; 2570 } 2571 2572 return 0; 2573 } 2574 2575 static int virtio_net_tx_waiting_pre_load(void *opaque) 2576 { 2577 struct VirtIONetMigTmp *tmp = opaque; 2578 2579 /* Reuse the pointer setup from save */ 2580 virtio_net_tx_waiting_pre_save(opaque); 2581 2582 if (tmp->parent->curr_queues > tmp->parent->max_queues) { 2583 error_report("virtio-net: curr_queues %x > max_queues %x", 2584 tmp->parent->curr_queues, tmp->parent->max_queues); 2585 2586 return -EINVAL; 2587 } 2588 2589 return 0; /* all good */ 2590 } 2591 2592 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 2593 .name = "virtio-net-tx_waiting", 2594 .pre_load = virtio_net_tx_waiting_pre_load, 2595 .pre_save = virtio_net_tx_waiting_pre_save, 2596 .fields = (VMStateField[]) { 2597 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 2598 curr_queues_1, 2599 vmstate_virtio_net_queue_tx_waiting, 2600 struct VirtIONetQueue), 2601 VMSTATE_END_OF_LIST() 2602 }, 2603 }; 2604 2605 /* the 'has_ufo' flag is just tested; if the incoming stream has the 2606 * flag set we need to check that we have it 2607 */ 2608 static int virtio_net_ufo_post_load(void *opaque, int version_id) 2609 { 2610 struct VirtIONetMigTmp *tmp = opaque; 2611 2612 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 2613 error_report("virtio-net: saved image requires TUN_F_UFO support"); 2614 return -EINVAL; 2615 } 2616 2617 return 0; 2618 } 2619 2620 static int virtio_net_ufo_pre_save(void *opaque) 2621 { 2622 struct VirtIONetMigTmp *tmp = opaque; 2623 2624 tmp->has_ufo = tmp->parent->has_ufo; 2625 2626 return 0; 2627 } 2628 2629 static const VMStateDescription vmstate_virtio_net_has_ufo = { 2630 .name = "virtio-net-ufo", 2631 .post_load = virtio_net_ufo_post_load, 2632 .pre_save = virtio_net_ufo_pre_save, 2633 .fields = (VMStateField[]) { 2634 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 2635 VMSTATE_END_OF_LIST() 2636 }, 2637 }; 2638 2639 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 2640 * flag set we need to check that we have it 2641 */ 2642 static int virtio_net_vnet_post_load(void *opaque, int version_id) 2643 { 2644 struct VirtIONetMigTmp *tmp = opaque; 2645 2646 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 2647 error_report("virtio-net: saved image requires vnet_hdr=on"); 2648 return -EINVAL; 2649 } 2650 2651 return 0; 2652 } 2653 2654 static int virtio_net_vnet_pre_save(void *opaque) 2655 { 2656 struct VirtIONetMigTmp *tmp = opaque; 2657 2658 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 2659 2660 return 0; 2661 } 2662 2663 static const VMStateDescription vmstate_virtio_net_has_vnet = { 2664 .name = "virtio-net-vnet", 2665 .post_load = virtio_net_vnet_post_load, 2666 .pre_save = virtio_net_vnet_pre_save, 2667 .fields = (VMStateField[]) { 2668 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 2669 VMSTATE_END_OF_LIST() 2670 }, 2671 }; 2672 2673 static const VMStateDescription vmstate_virtio_net_device = { 2674 .name = "virtio-net-device", 2675 .version_id = VIRTIO_NET_VM_VERSION, 2676 .minimum_version_id = VIRTIO_NET_VM_VERSION, 2677 .post_load = virtio_net_post_load_device, 2678 .fields = (VMStateField[]) { 2679 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 2680 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 2681 vmstate_virtio_net_queue_tx_waiting, 2682 VirtIONetQueue), 2683 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 2684 VMSTATE_UINT16(status, VirtIONet), 2685 VMSTATE_UINT8(promisc, VirtIONet), 2686 VMSTATE_UINT8(allmulti, VirtIONet), 2687 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 2688 2689 /* Guarded pair: If it fits we load it, else we throw it away 2690 * - can happen if source has a larger MAC table.; post-load 2691 * sets flags in this case. 2692 */ 2693 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 2694 0, mac_table_fits, mac_table.in_use, 2695 ETH_ALEN), 2696 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 2697 mac_table.in_use, ETH_ALEN), 2698 2699 /* Note: This is an array of uint32's that's always been saved as a 2700 * buffer; hold onto your endiannesses; it's actually used as a bitmap 2701 * but based on the uint. 2702 */ 2703 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 2704 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 2705 vmstate_virtio_net_has_vnet), 2706 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 2707 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 2708 VMSTATE_UINT8(alluni, VirtIONet), 2709 VMSTATE_UINT8(nomulti, VirtIONet), 2710 VMSTATE_UINT8(nouni, VirtIONet), 2711 VMSTATE_UINT8(nobcast, VirtIONet), 2712 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 2713 vmstate_virtio_net_has_ufo), 2714 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0, 2715 vmstate_info_uint16_equal, uint16_t), 2716 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1), 2717 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 2718 vmstate_virtio_net_tx_waiting), 2719 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 2720 has_ctrl_guest_offloads), 2721 VMSTATE_END_OF_LIST() 2722 }, 2723 }; 2724 2725 static NetClientInfo net_virtio_info = { 2726 .type = NET_CLIENT_DRIVER_NIC, 2727 .size = sizeof(NICState), 2728 .can_receive = virtio_net_can_receive, 2729 .receive = virtio_net_receive, 2730 .link_status_changed = virtio_net_set_link_status, 2731 .query_rx_filter = virtio_net_query_rxfilter, 2732 .announce = virtio_net_announce, 2733 }; 2734 2735 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 2736 { 2737 VirtIONet *n = VIRTIO_NET(vdev); 2738 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 2739 assert(n->vhost_started); 2740 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 2741 } 2742 2743 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 2744 bool mask) 2745 { 2746 VirtIONet *n = VIRTIO_NET(vdev); 2747 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 2748 assert(n->vhost_started); 2749 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 2750 vdev, idx, mask); 2751 } 2752 2753 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 2754 { 2755 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 2756 2757 n->config_size = virtio_feature_get_config_size(feature_sizes, 2758 host_features); 2759 } 2760 2761 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 2762 const char *type) 2763 { 2764 /* 2765 * The name can be NULL, the netclient name will be type.x. 2766 */ 2767 assert(type != NULL); 2768 2769 g_free(n->netclient_name); 2770 g_free(n->netclient_type); 2771 n->netclient_name = g_strdup(name); 2772 n->netclient_type = g_strdup(type); 2773 } 2774 2775 static bool failover_unplug_primary(VirtIONet *n) 2776 { 2777 HotplugHandler *hotplug_ctrl; 2778 PCIDevice *pci_dev; 2779 Error *err = NULL; 2780 2781 hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev); 2782 if (hotplug_ctrl) { 2783 pci_dev = PCI_DEVICE(n->primary_dev); 2784 pci_dev->partially_hotplugged = true; 2785 hotplug_handler_unplug_request(hotplug_ctrl, n->primary_dev, &err); 2786 if (err) { 2787 error_report_err(err); 2788 return false; 2789 } 2790 } else { 2791 return false; 2792 } 2793 return true; 2794 } 2795 2796 static bool failover_replug_primary(VirtIONet *n, Error **errp) 2797 { 2798 Error *err = NULL; 2799 HotplugHandler *hotplug_ctrl; 2800 PCIDevice *pdev = PCI_DEVICE(n->primary_dev); 2801 2802 if (!pdev->partially_hotplugged) { 2803 return true; 2804 } 2805 if (!n->primary_device_opts) { 2806 n->primary_device_opts = qemu_opts_from_qdict( 2807 qemu_find_opts("device"), 2808 n->primary_device_dict, errp); 2809 if (!n->primary_device_opts) { 2810 return false; 2811 } 2812 } 2813 n->primary_bus = n->primary_dev->parent_bus; 2814 if (!n->primary_bus) { 2815 error_setg(errp, "virtio_net: couldn't find primary bus"); 2816 return false; 2817 } 2818 qdev_set_parent_bus(n->primary_dev, n->primary_bus); 2819 n->primary_should_be_hidden = false; 2820 qemu_opt_set_bool(n->primary_device_opts, 2821 "partially_hotplugged", true, &err); 2822 if (err) { 2823 goto out; 2824 } 2825 hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev); 2826 if (hotplug_ctrl) { 2827 hotplug_handler_pre_plug(hotplug_ctrl, n->primary_dev, &err); 2828 if (err) { 2829 goto out; 2830 } 2831 hotplug_handler_plug(hotplug_ctrl, n->primary_dev, errp); 2832 } 2833 2834 out: 2835 error_propagate(errp, err); 2836 return !err; 2837 } 2838 2839 static void virtio_net_handle_migration_primary(VirtIONet *n, 2840 MigrationState *s) 2841 { 2842 bool should_be_hidden; 2843 Error *err = NULL; 2844 2845 should_be_hidden = atomic_read(&n->primary_should_be_hidden); 2846 2847 if (!n->primary_dev) { 2848 n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err); 2849 if (!n->primary_dev) { 2850 return; 2851 } 2852 } 2853 2854 if (migration_in_setup(s) && !should_be_hidden) { 2855 if (failover_unplug_primary(n)) { 2856 vmstate_unregister(n->primary_dev, qdev_get_vmsd(n->primary_dev), 2857 n->primary_dev); 2858 qapi_event_send_unplug_primary(n->primary_device_id); 2859 atomic_set(&n->primary_should_be_hidden, true); 2860 } else { 2861 warn_report("couldn't unplug primary device"); 2862 } 2863 } else if (migration_has_failed(s)) { 2864 /* We already unplugged the device let's plug it back */ 2865 if (!failover_replug_primary(n, &err)) { 2866 if (err) { 2867 error_report_err(err); 2868 } 2869 } 2870 } 2871 } 2872 2873 static void virtio_net_migration_state_notifier(Notifier *notifier, void *data) 2874 { 2875 MigrationState *s = data; 2876 VirtIONet *n = container_of(notifier, VirtIONet, migration_state); 2877 virtio_net_handle_migration_primary(n, s); 2878 } 2879 2880 static int virtio_net_primary_should_be_hidden(DeviceListener *listener, 2881 QemuOpts *device_opts) 2882 { 2883 VirtIONet *n = container_of(listener, VirtIONet, primary_listener); 2884 bool match_found = false; 2885 bool hide = false; 2886 2887 if (!device_opts) { 2888 return -1; 2889 } 2890 n->primary_device_dict = qemu_opts_to_qdict(device_opts, 2891 n->primary_device_dict); 2892 if (n->primary_device_dict) { 2893 g_free(n->standby_id); 2894 n->standby_id = g_strdup(qdict_get_try_str(n->primary_device_dict, 2895 "failover_pair_id")); 2896 } 2897 if (g_strcmp0(n->standby_id, n->netclient_name) == 0) { 2898 match_found = true; 2899 } else { 2900 match_found = false; 2901 hide = false; 2902 g_free(n->standby_id); 2903 n->primary_device_dict = NULL; 2904 goto out; 2905 } 2906 2907 n->primary_device_opts = device_opts; 2908 2909 /* primary_should_be_hidden is set during feature negotiation */ 2910 hide = atomic_read(&n->primary_should_be_hidden); 2911 2912 if (n->primary_device_dict) { 2913 g_free(n->primary_device_id); 2914 n->primary_device_id = g_strdup(qdict_get_try_str( 2915 n->primary_device_dict, "id")); 2916 if (!n->primary_device_id) { 2917 warn_report("primary_device_id not set"); 2918 } 2919 } 2920 2921 out: 2922 if (match_found && hide) { 2923 return 1; 2924 } else if (match_found && !hide) { 2925 return 0; 2926 } else { 2927 return -1; 2928 } 2929 } 2930 2931 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 2932 { 2933 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 2934 VirtIONet *n = VIRTIO_NET(dev); 2935 NetClientState *nc; 2936 int i; 2937 2938 if (n->net_conf.mtu) { 2939 n->host_features |= (1ULL << VIRTIO_NET_F_MTU); 2940 } 2941 2942 if (n->net_conf.duplex_str) { 2943 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) { 2944 n->net_conf.duplex = DUPLEX_HALF; 2945 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) { 2946 n->net_conf.duplex = DUPLEX_FULL; 2947 } else { 2948 error_setg(errp, "'duplex' must be 'half' or 'full'"); 2949 } 2950 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 2951 } else { 2952 n->net_conf.duplex = DUPLEX_UNKNOWN; 2953 } 2954 2955 if (n->net_conf.speed < SPEED_UNKNOWN) { 2956 error_setg(errp, "'speed' must be between 0 and INT_MAX"); 2957 } else if (n->net_conf.speed >= 0) { 2958 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 2959 } 2960 2961 if (n->failover) { 2962 n->primary_listener.should_be_hidden = 2963 virtio_net_primary_should_be_hidden; 2964 atomic_set(&n->primary_should_be_hidden, true); 2965 device_listener_register(&n->primary_listener); 2966 n->migration_state.notify = virtio_net_migration_state_notifier; 2967 add_migration_state_change_notifier(&n->migration_state); 2968 n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY); 2969 } 2970 2971 virtio_net_set_config_size(n, n->host_features); 2972 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 2973 2974 /* 2975 * We set a lower limit on RX queue size to what it always was. 2976 * Guests that want a smaller ring can always resize it without 2977 * help from us (using virtio 1 and up). 2978 */ 2979 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 2980 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 2981 !is_power_of_2(n->net_conf.rx_queue_size)) { 2982 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 2983 "must be a power of 2 between %d and %d.", 2984 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 2985 VIRTQUEUE_MAX_SIZE); 2986 virtio_cleanup(vdev); 2987 return; 2988 } 2989 2990 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || 2991 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE || 2992 !is_power_of_2(n->net_conf.tx_queue_size)) { 2993 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " 2994 "must be a power of 2 between %d and %d", 2995 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, 2996 VIRTQUEUE_MAX_SIZE); 2997 virtio_cleanup(vdev); 2998 return; 2999 } 3000 3001 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 3002 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 3003 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 3004 "must be a positive integer less than %d.", 3005 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 3006 virtio_cleanup(vdev); 3007 return; 3008 } 3009 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 3010 n->curr_queues = 1; 3011 n->tx_timeout = n->net_conf.txtimer; 3012 3013 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 3014 && strcmp(n->net_conf.tx, "bh")) { 3015 warn_report("virtio-net: " 3016 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 3017 n->net_conf.tx); 3018 error_printf("Defaulting to \"bh\""); 3019 } 3020 3021 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), 3022 n->net_conf.tx_queue_size); 3023 3024 for (i = 0; i < n->max_queues; i++) { 3025 virtio_net_add_queue(n, i); 3026 } 3027 3028 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 3029 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 3030 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 3031 n->status = VIRTIO_NET_S_LINK_UP; 3032 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 3033 QEMU_CLOCK_VIRTUAL, 3034 virtio_net_announce_timer, n); 3035 n->announce_timer.round = 0; 3036 3037 if (n->netclient_type) { 3038 /* 3039 * Happen when virtio_net_set_netclient_name has been called. 3040 */ 3041 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3042 n->netclient_type, n->netclient_name, n); 3043 } else { 3044 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3045 object_get_typename(OBJECT(dev)), dev->id, n); 3046 } 3047 3048 peer_test_vnet_hdr(n); 3049 if (peer_has_vnet_hdr(n)) { 3050 for (i = 0; i < n->max_queues; i++) { 3051 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 3052 } 3053 n->host_hdr_len = sizeof(struct virtio_net_hdr); 3054 } else { 3055 n->host_hdr_len = 0; 3056 } 3057 3058 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 3059 3060 n->vqs[0].tx_waiting = 0; 3061 n->tx_burst = n->net_conf.txburst; 3062 virtio_net_set_mrg_rx_bufs(n, 0, 0); 3063 n->promisc = 1; /* for compatibility */ 3064 3065 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 3066 3067 n->vlans = g_malloc0(MAX_VLAN >> 3); 3068 3069 nc = qemu_get_queue(n->nic); 3070 nc->rxfilter_notify_enabled = 1; 3071 3072 QTAILQ_INIT(&n->rsc_chains); 3073 n->qdev = dev; 3074 } 3075 3076 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 3077 { 3078 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3079 VirtIONet *n = VIRTIO_NET(dev); 3080 int i, max_queues; 3081 3082 /* This will stop vhost backend if appropriate. */ 3083 virtio_net_set_status(vdev, 0); 3084 3085 g_free(n->netclient_name); 3086 n->netclient_name = NULL; 3087 g_free(n->netclient_type); 3088 n->netclient_type = NULL; 3089 3090 g_free(n->mac_table.macs); 3091 g_free(n->vlans); 3092 3093 if (n->failover) { 3094 g_free(n->primary_device_id); 3095 g_free(n->standby_id); 3096 qobject_unref(n->primary_device_dict); 3097 n->primary_device_dict = NULL; 3098 } 3099 3100 max_queues = n->multiqueue ? n->max_queues : 1; 3101 for (i = 0; i < max_queues; i++) { 3102 virtio_net_del_queue(n, i); 3103 } 3104 3105 qemu_announce_timer_del(&n->announce_timer, false); 3106 g_free(n->vqs); 3107 qemu_del_nic(n->nic); 3108 virtio_net_rsc_cleanup(n); 3109 virtio_cleanup(vdev); 3110 } 3111 3112 static void virtio_net_instance_init(Object *obj) 3113 { 3114 VirtIONet *n = VIRTIO_NET(obj); 3115 3116 /* 3117 * The default config_size is sizeof(struct virtio_net_config). 3118 * Can be overriden with virtio_net_set_config_size. 3119 */ 3120 n->config_size = sizeof(struct virtio_net_config); 3121 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 3122 "bootindex", "/ethernet-phy@0", 3123 DEVICE(n), NULL); 3124 } 3125 3126 static int virtio_net_pre_save(void *opaque) 3127 { 3128 VirtIONet *n = opaque; 3129 3130 /* At this point, backend must be stopped, otherwise 3131 * it might keep writing to memory. */ 3132 assert(!n->vhost_started); 3133 3134 return 0; 3135 } 3136 3137 static bool primary_unplug_pending(void *opaque) 3138 { 3139 DeviceState *dev = opaque; 3140 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3141 VirtIONet *n = VIRTIO_NET(vdev); 3142 3143 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 3144 return false; 3145 } 3146 return n->primary_dev ? n->primary_dev->pending_deleted_event : false; 3147 } 3148 3149 static bool dev_unplug_pending(void *opaque) 3150 { 3151 DeviceState *dev = opaque; 3152 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); 3153 3154 return vdc->primary_unplug_pending(dev); 3155 } 3156 3157 static const VMStateDescription vmstate_virtio_net = { 3158 .name = "virtio-net", 3159 .minimum_version_id = VIRTIO_NET_VM_VERSION, 3160 .version_id = VIRTIO_NET_VM_VERSION, 3161 .fields = (VMStateField[]) { 3162 VMSTATE_VIRTIO_DEVICE, 3163 VMSTATE_END_OF_LIST() 3164 }, 3165 .pre_save = virtio_net_pre_save, 3166 .dev_unplug_pending = dev_unplug_pending, 3167 }; 3168 3169 static Property virtio_net_properties[] = { 3170 DEFINE_PROP_BIT64("csum", VirtIONet, host_features, 3171 VIRTIO_NET_F_CSUM, true), 3172 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features, 3173 VIRTIO_NET_F_GUEST_CSUM, true), 3174 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 3175 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features, 3176 VIRTIO_NET_F_GUEST_TSO4, true), 3177 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features, 3178 VIRTIO_NET_F_GUEST_TSO6, true), 3179 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features, 3180 VIRTIO_NET_F_GUEST_ECN, true), 3181 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features, 3182 VIRTIO_NET_F_GUEST_UFO, true), 3183 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features, 3184 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 3185 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features, 3186 VIRTIO_NET_F_HOST_TSO4, true), 3187 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features, 3188 VIRTIO_NET_F_HOST_TSO6, true), 3189 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features, 3190 VIRTIO_NET_F_HOST_ECN, true), 3191 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features, 3192 VIRTIO_NET_F_HOST_UFO, true), 3193 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features, 3194 VIRTIO_NET_F_MRG_RXBUF, true), 3195 DEFINE_PROP_BIT64("status", VirtIONet, host_features, 3196 VIRTIO_NET_F_STATUS, true), 3197 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features, 3198 VIRTIO_NET_F_CTRL_VQ, true), 3199 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features, 3200 VIRTIO_NET_F_CTRL_RX, true), 3201 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features, 3202 VIRTIO_NET_F_CTRL_VLAN, true), 3203 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features, 3204 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 3205 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features, 3206 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 3207 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features, 3208 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 3209 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 3210 DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features, 3211 VIRTIO_NET_F_RSC_EXT, false), 3212 DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout, 3213 VIRTIO_NET_RSC_DEFAULT_INTERVAL), 3214 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 3215 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 3216 TX_TIMER_INTERVAL), 3217 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 3218 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 3219 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 3220 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 3221 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 3222 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), 3223 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 3224 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 3225 true), 3226 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN), 3227 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str), 3228 DEFINE_PROP_BOOL("failover", VirtIONet, failover, false), 3229 DEFINE_PROP_END_OF_LIST(), 3230 }; 3231 3232 static void virtio_net_class_init(ObjectClass *klass, void *data) 3233 { 3234 DeviceClass *dc = DEVICE_CLASS(klass); 3235 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 3236 3237 dc->props = virtio_net_properties; 3238 dc->vmsd = &vmstate_virtio_net; 3239 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 3240 vdc->realize = virtio_net_device_realize; 3241 vdc->unrealize = virtio_net_device_unrealize; 3242 vdc->get_config = virtio_net_get_config; 3243 vdc->set_config = virtio_net_set_config; 3244 vdc->get_features = virtio_net_get_features; 3245 vdc->set_features = virtio_net_set_features; 3246 vdc->bad_features = virtio_net_bad_features; 3247 vdc->reset = virtio_net_reset; 3248 vdc->set_status = virtio_net_set_status; 3249 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 3250 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 3251 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 3252 vdc->post_load = virtio_net_post_load_virtio; 3253 vdc->vmsd = &vmstate_virtio_net_device; 3254 vdc->primary_unplug_pending = primary_unplug_pending; 3255 } 3256 3257 static const TypeInfo virtio_net_info = { 3258 .name = TYPE_VIRTIO_NET, 3259 .parent = TYPE_VIRTIO_DEVICE, 3260 .instance_size = sizeof(VirtIONet), 3261 .instance_init = virtio_net_instance_init, 3262 .class_init = virtio_net_class_init, 3263 }; 3264 3265 static void virtio_register_types(void) 3266 { 3267 type_register_static(&virtio_net_info); 3268 } 3269 3270 type_init(virtio_register_types) 3271