1 /* 2 * Virtio Network Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/iov.h" 16 #include "hw/virtio/virtio.h" 17 #include "net/net.h" 18 #include "net/checksum.h" 19 #include "net/tap.h" 20 #include "qemu/error-report.h" 21 #include "qemu/timer.h" 22 #include "hw/virtio/virtio-net.h" 23 #include "net/vhost_net.h" 24 #include "hw/virtio/virtio-bus.h" 25 #include "qapi/qmp/qjson.h" 26 #include "qapi-event.h" 27 #include "hw/virtio/virtio-access.h" 28 29 #define VIRTIO_NET_VM_VERSION 11 30 31 #define MAC_TABLE_ENTRIES 64 32 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 33 34 /* previously fixed value */ 35 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 36 /* for now, only allow larger queues; with virtio-1, guest can downsize */ 37 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 38 39 /* 40 * Calculate the number of bytes up to and including the given 'field' of 41 * 'container'. 42 */ 43 #define endof(container, field) \ 44 (offsetof(container, field) + sizeof(((container *)0)->field)) 45 46 typedef struct VirtIOFeature { 47 uint32_t flags; 48 size_t end; 49 } VirtIOFeature; 50 51 static VirtIOFeature feature_sizes[] = { 52 {.flags = 1 << VIRTIO_NET_F_MAC, 53 .end = endof(struct virtio_net_config, mac)}, 54 {.flags = 1 << VIRTIO_NET_F_STATUS, 55 .end = endof(struct virtio_net_config, status)}, 56 {.flags = 1 << VIRTIO_NET_F_MQ, 57 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 58 {} 59 }; 60 61 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 62 { 63 VirtIONet *n = qemu_get_nic_opaque(nc); 64 65 return &n->vqs[nc->queue_index]; 66 } 67 68 static int vq2q(int queue_index) 69 { 70 return queue_index / 2; 71 } 72 73 /* TODO 74 * - we could suppress RX interrupt if we were so inclined. 75 */ 76 77 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 78 { 79 VirtIONet *n = VIRTIO_NET(vdev); 80 struct virtio_net_config netcfg; 81 82 virtio_stw_p(vdev, &netcfg.status, n->status); 83 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 84 memcpy(netcfg.mac, n->mac, ETH_ALEN); 85 memcpy(config, &netcfg, n->config_size); 86 } 87 88 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 89 { 90 VirtIONet *n = VIRTIO_NET(vdev); 91 struct virtio_net_config netcfg = {}; 92 93 memcpy(&netcfg, config, n->config_size); 94 95 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 96 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 97 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 98 memcpy(n->mac, netcfg.mac, ETH_ALEN); 99 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 100 } 101 } 102 103 static bool virtio_net_started(VirtIONet *n, uint8_t status) 104 { 105 VirtIODevice *vdev = VIRTIO_DEVICE(n); 106 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 107 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 108 } 109 110 static void virtio_net_announce_timer(void *opaque) 111 { 112 VirtIONet *n = opaque; 113 VirtIODevice *vdev = VIRTIO_DEVICE(n); 114 115 n->announce_counter--; 116 n->status |= VIRTIO_NET_S_ANNOUNCE; 117 virtio_notify_config(vdev); 118 } 119 120 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 121 { 122 VirtIODevice *vdev = VIRTIO_DEVICE(n); 123 NetClientState *nc = qemu_get_queue(n->nic); 124 int queues = n->multiqueue ? n->max_queues : 1; 125 126 if (!get_vhost_net(nc->peer)) { 127 return; 128 } 129 130 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 131 !!n->vhost_started) { 132 return; 133 } 134 if (!n->vhost_started) { 135 int r, i; 136 137 if (n->needs_vnet_hdr_swap) { 138 error_report("backend does not support %s vnet headers; " 139 "falling back on userspace virtio", 140 virtio_is_big_endian(vdev) ? "BE" : "LE"); 141 return; 142 } 143 144 /* Any packets outstanding? Purge them to avoid touching rings 145 * when vhost is running. 146 */ 147 for (i = 0; i < queues; i++) { 148 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 149 150 /* Purge both directions: TX and RX. */ 151 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 152 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 153 } 154 155 n->vhost_started = 1; 156 r = vhost_net_start(vdev, n->nic->ncs, queues); 157 if (r < 0) { 158 error_report("unable to start vhost net: %d: " 159 "falling back on userspace virtio", -r); 160 n->vhost_started = 0; 161 } 162 } else { 163 vhost_net_stop(vdev, n->nic->ncs, queues); 164 n->vhost_started = 0; 165 } 166 } 167 168 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 169 NetClientState *peer, 170 bool enable) 171 { 172 if (virtio_is_big_endian(vdev)) { 173 return qemu_set_vnet_be(peer, enable); 174 } else { 175 return qemu_set_vnet_le(peer, enable); 176 } 177 } 178 179 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 180 int queues, bool enable) 181 { 182 int i; 183 184 for (i = 0; i < queues; i++) { 185 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 186 enable) { 187 while (--i >= 0) { 188 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 189 } 190 191 return true; 192 } 193 } 194 195 return false; 196 } 197 198 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 199 { 200 VirtIODevice *vdev = VIRTIO_DEVICE(n); 201 int queues = n->multiqueue ? n->max_queues : 1; 202 203 if (virtio_net_started(n, status)) { 204 /* Before using the device, we tell the network backend about the 205 * endianness to use when parsing vnet headers. If the backend 206 * can't do it, we fallback onto fixing the headers in the core 207 * virtio-net code. 208 */ 209 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, 210 queues, true); 211 } else if (virtio_net_started(n, vdev->status)) { 212 /* After using the device, we need to reset the network backend to 213 * the default (guest native endianness), otherwise the guest may 214 * lose network connectivity if it is rebooted into a different 215 * endianness. 216 */ 217 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); 218 } 219 } 220 221 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 222 { 223 VirtIONet *n = VIRTIO_NET(vdev); 224 VirtIONetQueue *q; 225 int i; 226 uint8_t queue_status; 227 228 virtio_net_vnet_endian_status(n, status); 229 virtio_net_vhost_status(n, status); 230 231 for (i = 0; i < n->max_queues; i++) { 232 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 233 bool queue_started; 234 q = &n->vqs[i]; 235 236 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 237 queue_status = 0; 238 } else { 239 queue_status = status; 240 } 241 queue_started = 242 virtio_net_started(n, queue_status) && !n->vhost_started; 243 244 if (queue_started) { 245 qemu_flush_queued_packets(ncs); 246 } 247 248 if (!q->tx_waiting) { 249 continue; 250 } 251 252 if (queue_started) { 253 if (q->tx_timer) { 254 timer_mod(q->tx_timer, 255 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 256 } else { 257 qemu_bh_schedule(q->tx_bh); 258 } 259 } else { 260 if (q->tx_timer) { 261 timer_del(q->tx_timer); 262 } else { 263 qemu_bh_cancel(q->tx_bh); 264 } 265 } 266 } 267 } 268 269 static void virtio_net_set_link_status(NetClientState *nc) 270 { 271 VirtIONet *n = qemu_get_nic_opaque(nc); 272 VirtIODevice *vdev = VIRTIO_DEVICE(n); 273 uint16_t old_status = n->status; 274 275 if (nc->link_down) 276 n->status &= ~VIRTIO_NET_S_LINK_UP; 277 else 278 n->status |= VIRTIO_NET_S_LINK_UP; 279 280 if (n->status != old_status) 281 virtio_notify_config(vdev); 282 283 virtio_net_set_status(vdev, vdev->status); 284 } 285 286 static void rxfilter_notify(NetClientState *nc) 287 { 288 VirtIONet *n = qemu_get_nic_opaque(nc); 289 290 if (nc->rxfilter_notify_enabled) { 291 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 292 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 293 n->netclient_name, path, &error_abort); 294 g_free(path); 295 296 /* disable event notification to avoid events flooding */ 297 nc->rxfilter_notify_enabled = 0; 298 } 299 } 300 301 static intList *get_vlan_table(VirtIONet *n) 302 { 303 intList *list, *entry; 304 int i, j; 305 306 list = NULL; 307 for (i = 0; i < MAX_VLAN >> 5; i++) { 308 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 309 if (n->vlans[i] & (1U << j)) { 310 entry = g_malloc0(sizeof(*entry)); 311 entry->value = (i << 5) + j; 312 entry->next = list; 313 list = entry; 314 } 315 } 316 } 317 318 return list; 319 } 320 321 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 322 { 323 VirtIONet *n = qemu_get_nic_opaque(nc); 324 VirtIODevice *vdev = VIRTIO_DEVICE(n); 325 RxFilterInfo *info; 326 strList *str_list, *entry; 327 int i; 328 329 info = g_malloc0(sizeof(*info)); 330 info->name = g_strdup(nc->name); 331 info->promiscuous = n->promisc; 332 333 if (n->nouni) { 334 info->unicast = RX_STATE_NONE; 335 } else if (n->alluni) { 336 info->unicast = RX_STATE_ALL; 337 } else { 338 info->unicast = RX_STATE_NORMAL; 339 } 340 341 if (n->nomulti) { 342 info->multicast = RX_STATE_NONE; 343 } else if (n->allmulti) { 344 info->multicast = RX_STATE_ALL; 345 } else { 346 info->multicast = RX_STATE_NORMAL; 347 } 348 349 info->broadcast_allowed = n->nobcast; 350 info->multicast_overflow = n->mac_table.multi_overflow; 351 info->unicast_overflow = n->mac_table.uni_overflow; 352 353 info->main_mac = qemu_mac_strdup_printf(n->mac); 354 355 str_list = NULL; 356 for (i = 0; i < n->mac_table.first_multi; i++) { 357 entry = g_malloc0(sizeof(*entry)); 358 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 359 entry->next = str_list; 360 str_list = entry; 361 } 362 info->unicast_table = str_list; 363 364 str_list = NULL; 365 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 366 entry = g_malloc0(sizeof(*entry)); 367 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 368 entry->next = str_list; 369 str_list = entry; 370 } 371 info->multicast_table = str_list; 372 info->vlan_table = get_vlan_table(n); 373 374 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 375 info->vlan = RX_STATE_ALL; 376 } else if (!info->vlan_table) { 377 info->vlan = RX_STATE_NONE; 378 } else { 379 info->vlan = RX_STATE_NORMAL; 380 } 381 382 /* enable event notification after query */ 383 nc->rxfilter_notify_enabled = 1; 384 385 return info; 386 } 387 388 static void virtio_net_reset(VirtIODevice *vdev) 389 { 390 VirtIONet *n = VIRTIO_NET(vdev); 391 392 /* Reset back to compatibility mode */ 393 n->promisc = 1; 394 n->allmulti = 0; 395 n->alluni = 0; 396 n->nomulti = 0; 397 n->nouni = 0; 398 n->nobcast = 0; 399 /* multiqueue is disabled by default */ 400 n->curr_queues = 1; 401 timer_del(n->announce_timer); 402 n->announce_counter = 0; 403 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 404 405 /* Flush any MAC and VLAN filter table state */ 406 n->mac_table.in_use = 0; 407 n->mac_table.first_multi = 0; 408 n->mac_table.multi_overflow = 0; 409 n->mac_table.uni_overflow = 0; 410 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 411 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 412 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 413 memset(n->vlans, 0, MAX_VLAN >> 3); 414 } 415 416 static void peer_test_vnet_hdr(VirtIONet *n) 417 { 418 NetClientState *nc = qemu_get_queue(n->nic); 419 if (!nc->peer) { 420 return; 421 } 422 423 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 424 } 425 426 static int peer_has_vnet_hdr(VirtIONet *n) 427 { 428 return n->has_vnet_hdr; 429 } 430 431 static int peer_has_ufo(VirtIONet *n) 432 { 433 if (!peer_has_vnet_hdr(n)) 434 return 0; 435 436 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 437 438 return n->has_ufo; 439 } 440 441 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 442 int version_1) 443 { 444 int i; 445 NetClientState *nc; 446 447 n->mergeable_rx_bufs = mergeable_rx_bufs; 448 449 if (version_1) { 450 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 451 } else { 452 n->guest_hdr_len = n->mergeable_rx_bufs ? 453 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 454 sizeof(struct virtio_net_hdr); 455 } 456 457 for (i = 0; i < n->max_queues; i++) { 458 nc = qemu_get_subqueue(n->nic, i); 459 460 if (peer_has_vnet_hdr(n) && 461 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 462 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 463 n->host_hdr_len = n->guest_hdr_len; 464 } 465 } 466 } 467 468 static int peer_attach(VirtIONet *n, int index) 469 { 470 NetClientState *nc = qemu_get_subqueue(n->nic, index); 471 472 if (!nc->peer) { 473 return 0; 474 } 475 476 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 477 vhost_set_vring_enable(nc->peer, 1); 478 } 479 480 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 481 return 0; 482 } 483 484 return tap_enable(nc->peer); 485 } 486 487 static int peer_detach(VirtIONet *n, int index) 488 { 489 NetClientState *nc = qemu_get_subqueue(n->nic, index); 490 491 if (!nc->peer) { 492 return 0; 493 } 494 495 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 496 vhost_set_vring_enable(nc->peer, 0); 497 } 498 499 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 500 return 0; 501 } 502 503 return tap_disable(nc->peer); 504 } 505 506 static void virtio_net_set_queues(VirtIONet *n) 507 { 508 int i; 509 int r; 510 511 if (n->nic->peer_deleted) { 512 return; 513 } 514 515 for (i = 0; i < n->max_queues; i++) { 516 if (i < n->curr_queues) { 517 r = peer_attach(n, i); 518 assert(!r); 519 } else { 520 r = peer_detach(n, i); 521 assert(!r); 522 } 523 } 524 } 525 526 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 527 528 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 529 Error **errp) 530 { 531 VirtIONet *n = VIRTIO_NET(vdev); 532 NetClientState *nc = qemu_get_queue(n->nic); 533 534 /* Firstly sync all virtio-net possible supported features */ 535 features |= n->host_features; 536 537 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 538 539 if (!peer_has_vnet_hdr(n)) { 540 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 541 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 542 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 543 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 544 545 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 546 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 547 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 548 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 549 } 550 551 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 552 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 553 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 554 } 555 556 if (!get_vhost_net(nc->peer)) { 557 return features; 558 } 559 return vhost_net_get_features(get_vhost_net(nc->peer), features); 560 } 561 562 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 563 { 564 uint64_t features = 0; 565 566 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 567 * but also these: */ 568 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 569 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 570 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 571 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 572 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 573 574 return features; 575 } 576 577 static void virtio_net_apply_guest_offloads(VirtIONet *n) 578 { 579 qemu_set_offload(qemu_get_queue(n->nic)->peer, 580 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 581 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 582 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 583 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 584 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 585 } 586 587 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 588 { 589 static const uint64_t guest_offloads_mask = 590 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 591 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 592 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 593 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 594 (1ULL << VIRTIO_NET_F_GUEST_UFO); 595 596 return guest_offloads_mask & features; 597 } 598 599 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 600 { 601 VirtIODevice *vdev = VIRTIO_DEVICE(n); 602 return virtio_net_guest_offloads_by_features(vdev->guest_features); 603 } 604 605 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 606 { 607 VirtIONet *n = VIRTIO_NET(vdev); 608 int i; 609 610 virtio_net_set_multiqueue(n, 611 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 612 613 virtio_net_set_mrg_rx_bufs(n, 614 virtio_has_feature(features, 615 VIRTIO_NET_F_MRG_RXBUF), 616 virtio_has_feature(features, 617 VIRTIO_F_VERSION_1)); 618 619 if (n->has_vnet_hdr) { 620 n->curr_guest_offloads = 621 virtio_net_guest_offloads_by_features(features); 622 virtio_net_apply_guest_offloads(n); 623 } 624 625 for (i = 0; i < n->max_queues; i++) { 626 NetClientState *nc = qemu_get_subqueue(n->nic, i); 627 628 if (!get_vhost_net(nc->peer)) { 629 continue; 630 } 631 vhost_net_ack_features(get_vhost_net(nc->peer), features); 632 } 633 634 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 635 memset(n->vlans, 0, MAX_VLAN >> 3); 636 } else { 637 memset(n->vlans, 0xff, MAX_VLAN >> 3); 638 } 639 } 640 641 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 642 struct iovec *iov, unsigned int iov_cnt) 643 { 644 uint8_t on; 645 size_t s; 646 NetClientState *nc = qemu_get_queue(n->nic); 647 648 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 649 if (s != sizeof(on)) { 650 return VIRTIO_NET_ERR; 651 } 652 653 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 654 n->promisc = on; 655 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 656 n->allmulti = on; 657 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 658 n->alluni = on; 659 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 660 n->nomulti = on; 661 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 662 n->nouni = on; 663 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 664 n->nobcast = on; 665 } else { 666 return VIRTIO_NET_ERR; 667 } 668 669 rxfilter_notify(nc); 670 671 return VIRTIO_NET_OK; 672 } 673 674 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 675 struct iovec *iov, unsigned int iov_cnt) 676 { 677 VirtIODevice *vdev = VIRTIO_DEVICE(n); 678 uint64_t offloads; 679 size_t s; 680 681 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 682 return VIRTIO_NET_ERR; 683 } 684 685 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 686 if (s != sizeof(offloads)) { 687 return VIRTIO_NET_ERR; 688 } 689 690 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 691 uint64_t supported_offloads; 692 693 if (!n->has_vnet_hdr) { 694 return VIRTIO_NET_ERR; 695 } 696 697 supported_offloads = virtio_net_supported_guest_offloads(n); 698 if (offloads & ~supported_offloads) { 699 return VIRTIO_NET_ERR; 700 } 701 702 n->curr_guest_offloads = offloads; 703 virtio_net_apply_guest_offloads(n); 704 705 return VIRTIO_NET_OK; 706 } else { 707 return VIRTIO_NET_ERR; 708 } 709 } 710 711 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 712 struct iovec *iov, unsigned int iov_cnt) 713 { 714 VirtIODevice *vdev = VIRTIO_DEVICE(n); 715 struct virtio_net_ctrl_mac mac_data; 716 size_t s; 717 NetClientState *nc = qemu_get_queue(n->nic); 718 719 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 720 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 721 return VIRTIO_NET_ERR; 722 } 723 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 724 assert(s == sizeof(n->mac)); 725 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 726 rxfilter_notify(nc); 727 728 return VIRTIO_NET_OK; 729 } 730 731 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 732 return VIRTIO_NET_ERR; 733 } 734 735 int in_use = 0; 736 int first_multi = 0; 737 uint8_t uni_overflow = 0; 738 uint8_t multi_overflow = 0; 739 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 740 741 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 742 sizeof(mac_data.entries)); 743 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 744 if (s != sizeof(mac_data.entries)) { 745 goto error; 746 } 747 iov_discard_front(&iov, &iov_cnt, s); 748 749 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 750 goto error; 751 } 752 753 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 754 s = iov_to_buf(iov, iov_cnt, 0, macs, 755 mac_data.entries * ETH_ALEN); 756 if (s != mac_data.entries * ETH_ALEN) { 757 goto error; 758 } 759 in_use += mac_data.entries; 760 } else { 761 uni_overflow = 1; 762 } 763 764 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 765 766 first_multi = in_use; 767 768 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 769 sizeof(mac_data.entries)); 770 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 771 if (s != sizeof(mac_data.entries)) { 772 goto error; 773 } 774 775 iov_discard_front(&iov, &iov_cnt, s); 776 777 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 778 goto error; 779 } 780 781 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 782 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 783 mac_data.entries * ETH_ALEN); 784 if (s != mac_data.entries * ETH_ALEN) { 785 goto error; 786 } 787 in_use += mac_data.entries; 788 } else { 789 multi_overflow = 1; 790 } 791 792 n->mac_table.in_use = in_use; 793 n->mac_table.first_multi = first_multi; 794 n->mac_table.uni_overflow = uni_overflow; 795 n->mac_table.multi_overflow = multi_overflow; 796 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 797 g_free(macs); 798 rxfilter_notify(nc); 799 800 return VIRTIO_NET_OK; 801 802 error: 803 g_free(macs); 804 return VIRTIO_NET_ERR; 805 } 806 807 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 808 struct iovec *iov, unsigned int iov_cnt) 809 { 810 VirtIODevice *vdev = VIRTIO_DEVICE(n); 811 uint16_t vid; 812 size_t s; 813 NetClientState *nc = qemu_get_queue(n->nic); 814 815 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 816 vid = virtio_lduw_p(vdev, &vid); 817 if (s != sizeof(vid)) { 818 return VIRTIO_NET_ERR; 819 } 820 821 if (vid >= MAX_VLAN) 822 return VIRTIO_NET_ERR; 823 824 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 825 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 826 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 827 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 828 else 829 return VIRTIO_NET_ERR; 830 831 rxfilter_notify(nc); 832 833 return VIRTIO_NET_OK; 834 } 835 836 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 837 struct iovec *iov, unsigned int iov_cnt) 838 { 839 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 840 n->status & VIRTIO_NET_S_ANNOUNCE) { 841 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 842 if (n->announce_counter) { 843 timer_mod(n->announce_timer, 844 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 845 self_announce_delay(n->announce_counter)); 846 } 847 return VIRTIO_NET_OK; 848 } else { 849 return VIRTIO_NET_ERR; 850 } 851 } 852 853 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 854 struct iovec *iov, unsigned int iov_cnt) 855 { 856 VirtIODevice *vdev = VIRTIO_DEVICE(n); 857 struct virtio_net_ctrl_mq mq; 858 size_t s; 859 uint16_t queues; 860 861 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 862 if (s != sizeof(mq)) { 863 return VIRTIO_NET_ERR; 864 } 865 866 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 867 return VIRTIO_NET_ERR; 868 } 869 870 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 871 872 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 873 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 874 queues > n->max_queues || 875 !n->multiqueue) { 876 return VIRTIO_NET_ERR; 877 } 878 879 n->curr_queues = queues; 880 /* stop the backend before changing the number of queues to avoid handling a 881 * disabled queue */ 882 virtio_net_set_status(vdev, vdev->status); 883 virtio_net_set_queues(n); 884 885 return VIRTIO_NET_OK; 886 } 887 888 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 889 { 890 VirtIONet *n = VIRTIO_NET(vdev); 891 struct virtio_net_ctrl_hdr ctrl; 892 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 893 VirtQueueElement *elem; 894 size_t s; 895 struct iovec *iov, *iov2; 896 unsigned int iov_cnt; 897 898 for (;;) { 899 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 900 if (!elem) { 901 break; 902 } 903 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || 904 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { 905 virtio_error(vdev, "virtio-net ctrl missing headers"); 906 virtqueue_detach_element(vq, elem, 0); 907 g_free(elem); 908 break; 909 } 910 911 iov_cnt = elem->out_num; 912 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); 913 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 914 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 915 if (s != sizeof(ctrl)) { 916 status = VIRTIO_NET_ERR; 917 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 918 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 919 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 920 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 921 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 922 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 923 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 924 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 925 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 926 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 927 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 928 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 929 } 930 931 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); 932 assert(s == sizeof(status)); 933 934 virtqueue_push(vq, elem, sizeof(status)); 935 virtio_notify(vdev, vq); 936 g_free(iov2); 937 g_free(elem); 938 } 939 } 940 941 /* RX */ 942 943 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 944 { 945 VirtIONet *n = VIRTIO_NET(vdev); 946 int queue_index = vq2q(virtio_get_queue_index(vq)); 947 948 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 949 } 950 951 static int virtio_net_can_receive(NetClientState *nc) 952 { 953 VirtIONet *n = qemu_get_nic_opaque(nc); 954 VirtIODevice *vdev = VIRTIO_DEVICE(n); 955 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 956 957 if (!vdev->vm_running) { 958 return 0; 959 } 960 961 if (nc->queue_index >= n->curr_queues) { 962 return 0; 963 } 964 965 if (!virtio_queue_ready(q->rx_vq) || 966 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 967 return 0; 968 } 969 970 return 1; 971 } 972 973 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 974 { 975 VirtIONet *n = q->n; 976 if (virtio_queue_empty(q->rx_vq) || 977 (n->mergeable_rx_bufs && 978 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 979 virtio_queue_set_notification(q->rx_vq, 1); 980 981 /* To avoid a race condition where the guest has made some buffers 982 * available after the above check but before notification was 983 * enabled, check for available buffers again. 984 */ 985 if (virtio_queue_empty(q->rx_vq) || 986 (n->mergeable_rx_bufs && 987 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 988 return 0; 989 } 990 } 991 992 virtio_queue_set_notification(q->rx_vq, 0); 993 return 1; 994 } 995 996 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 997 { 998 virtio_tswap16s(vdev, &hdr->hdr_len); 999 virtio_tswap16s(vdev, &hdr->gso_size); 1000 virtio_tswap16s(vdev, &hdr->csum_start); 1001 virtio_tswap16s(vdev, &hdr->csum_offset); 1002 } 1003 1004 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1005 * it never finds out that the packets don't have valid checksums. This 1006 * causes dhclient to get upset. Fedora's carried a patch for ages to 1007 * fix this with Xen but it hasn't appeared in an upstream release of 1008 * dhclient yet. 1009 * 1010 * To avoid breaking existing guests, we catch udp packets and add 1011 * checksums. This is terrible but it's better than hacking the guest 1012 * kernels. 1013 * 1014 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1015 * we should provide a mechanism to disable it to avoid polluting the host 1016 * cache. 1017 */ 1018 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1019 uint8_t *buf, size_t size) 1020 { 1021 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1022 (size > 27 && size < 1500) && /* normal sized MTU */ 1023 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1024 (buf[23] == 17) && /* ip.protocol == UDP */ 1025 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1026 net_checksum_calculate(buf, size); 1027 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1028 } 1029 } 1030 1031 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1032 const void *buf, size_t size) 1033 { 1034 if (n->has_vnet_hdr) { 1035 /* FIXME this cast is evil */ 1036 void *wbuf = (void *)buf; 1037 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1038 size - n->host_hdr_len); 1039 1040 if (n->needs_vnet_hdr_swap) { 1041 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1042 } 1043 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1044 } else { 1045 struct virtio_net_hdr hdr = { 1046 .flags = 0, 1047 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1048 }; 1049 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1050 } 1051 } 1052 1053 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1054 { 1055 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1056 static const uint8_t vlan[] = {0x81, 0x00}; 1057 uint8_t *ptr = (uint8_t *)buf; 1058 int i; 1059 1060 if (n->promisc) 1061 return 1; 1062 1063 ptr += n->host_hdr_len; 1064 1065 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1066 int vid = lduw_be_p(ptr + 14) & 0xfff; 1067 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1068 return 0; 1069 } 1070 1071 if (ptr[0] & 1) { // multicast 1072 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1073 return !n->nobcast; 1074 } else if (n->nomulti) { 1075 return 0; 1076 } else if (n->allmulti || n->mac_table.multi_overflow) { 1077 return 1; 1078 } 1079 1080 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1081 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1082 return 1; 1083 } 1084 } 1085 } else { // unicast 1086 if (n->nouni) { 1087 return 0; 1088 } else if (n->alluni || n->mac_table.uni_overflow) { 1089 return 1; 1090 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1091 return 1; 1092 } 1093 1094 for (i = 0; i < n->mac_table.first_multi; i++) { 1095 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1096 return 1; 1097 } 1098 } 1099 } 1100 1101 return 0; 1102 } 1103 1104 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 1105 { 1106 VirtIONet *n = qemu_get_nic_opaque(nc); 1107 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1108 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1109 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1110 struct virtio_net_hdr_mrg_rxbuf mhdr; 1111 unsigned mhdr_cnt = 0; 1112 size_t offset, i, guest_offset; 1113 1114 if (!virtio_net_can_receive(nc)) { 1115 return -1; 1116 } 1117 1118 /* hdr_len refers to the header we supply to the guest */ 1119 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1120 return 0; 1121 } 1122 1123 if (!receive_filter(n, buf, size)) 1124 return size; 1125 1126 offset = i = 0; 1127 1128 while (offset < size) { 1129 VirtQueueElement *elem; 1130 int len, total; 1131 const struct iovec *sg; 1132 1133 total = 0; 1134 1135 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1136 if (!elem) { 1137 if (i) { 1138 virtio_error(vdev, "virtio-net unexpected empty queue: " 1139 "i %zd mergeable %d offset %zd, size %zd, " 1140 "guest hdr len %zd, host hdr len %zd " 1141 "guest features 0x%" PRIx64, 1142 i, n->mergeable_rx_bufs, offset, size, 1143 n->guest_hdr_len, n->host_hdr_len, 1144 vdev->guest_features); 1145 } 1146 return -1; 1147 } 1148 1149 if (elem->in_num < 1) { 1150 virtio_error(vdev, 1151 "virtio-net receive queue contains no in buffers"); 1152 virtqueue_detach_element(q->rx_vq, elem, 0); 1153 g_free(elem); 1154 return -1; 1155 } 1156 1157 sg = elem->in_sg; 1158 if (i == 0) { 1159 assert(offset == 0); 1160 if (n->mergeable_rx_bufs) { 1161 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1162 sg, elem->in_num, 1163 offsetof(typeof(mhdr), num_buffers), 1164 sizeof(mhdr.num_buffers)); 1165 } 1166 1167 receive_header(n, sg, elem->in_num, buf, size); 1168 offset = n->host_hdr_len; 1169 total += n->guest_hdr_len; 1170 guest_offset = n->guest_hdr_len; 1171 } else { 1172 guest_offset = 0; 1173 } 1174 1175 /* copy in packet. ugh */ 1176 len = iov_from_buf(sg, elem->in_num, guest_offset, 1177 buf + offset, size - offset); 1178 total += len; 1179 offset += len; 1180 /* If buffers can't be merged, at this point we 1181 * must have consumed the complete packet. 1182 * Otherwise, drop it. */ 1183 if (!n->mergeable_rx_bufs && offset < size) { 1184 virtqueue_unpop(q->rx_vq, elem, total); 1185 g_free(elem); 1186 return size; 1187 } 1188 1189 /* signal other side */ 1190 virtqueue_fill(q->rx_vq, elem, total, i++); 1191 g_free(elem); 1192 } 1193 1194 if (mhdr_cnt) { 1195 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1196 iov_from_buf(mhdr_sg, mhdr_cnt, 1197 0, 1198 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1199 } 1200 1201 virtqueue_flush(q->rx_vq, i); 1202 virtio_notify(vdev, q->rx_vq); 1203 1204 return size; 1205 } 1206 1207 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1208 1209 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1210 { 1211 VirtIONet *n = qemu_get_nic_opaque(nc); 1212 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1213 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1214 1215 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 1216 virtio_notify(vdev, q->tx_vq); 1217 1218 g_free(q->async_tx.elem); 1219 q->async_tx.elem = NULL; 1220 1221 virtio_queue_set_notification(q->tx_vq, 1); 1222 virtio_net_flush_tx(q); 1223 } 1224 1225 /* TX */ 1226 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1227 { 1228 VirtIONet *n = q->n; 1229 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1230 VirtQueueElement *elem; 1231 int32_t num_packets = 0; 1232 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1233 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1234 return num_packets; 1235 } 1236 1237 if (q->async_tx.elem) { 1238 virtio_queue_set_notification(q->tx_vq, 0); 1239 return num_packets; 1240 } 1241 1242 for (;;) { 1243 ssize_t ret; 1244 unsigned int out_num; 1245 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 1246 struct virtio_net_hdr_mrg_rxbuf mhdr; 1247 1248 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 1249 if (!elem) { 1250 break; 1251 } 1252 1253 out_num = elem->out_num; 1254 out_sg = elem->out_sg; 1255 if (out_num < 1) { 1256 virtio_error(vdev, "virtio-net header not in first element"); 1257 virtqueue_detach_element(q->tx_vq, elem, 0); 1258 g_free(elem); 1259 return -EINVAL; 1260 } 1261 1262 if (n->has_vnet_hdr) { 1263 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < 1264 n->guest_hdr_len) { 1265 virtio_error(vdev, "virtio-net header incorrect"); 1266 virtqueue_detach_element(q->tx_vq, elem, 0); 1267 g_free(elem); 1268 return -EINVAL; 1269 } 1270 if (n->needs_vnet_hdr_swap) { 1271 virtio_net_hdr_swap(vdev, (void *) &mhdr); 1272 sg2[0].iov_base = &mhdr; 1273 sg2[0].iov_len = n->guest_hdr_len; 1274 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, 1275 out_sg, out_num, 1276 n->guest_hdr_len, -1); 1277 if (out_num == VIRTQUEUE_MAX_SIZE) { 1278 goto drop; 1279 } 1280 out_num += 1; 1281 out_sg = sg2; 1282 } 1283 } 1284 /* 1285 * If host wants to see the guest header as is, we can 1286 * pass it on unchanged. Otherwise, copy just the parts 1287 * that host is interested in. 1288 */ 1289 assert(n->host_hdr_len <= n->guest_hdr_len); 1290 if (n->host_hdr_len != n->guest_hdr_len) { 1291 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1292 out_sg, out_num, 1293 0, n->host_hdr_len); 1294 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1295 out_sg, out_num, 1296 n->guest_hdr_len, -1); 1297 out_num = sg_num; 1298 out_sg = sg; 1299 } 1300 1301 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1302 out_sg, out_num, virtio_net_tx_complete); 1303 if (ret == 0) { 1304 virtio_queue_set_notification(q->tx_vq, 0); 1305 q->async_tx.elem = elem; 1306 return -EBUSY; 1307 } 1308 1309 drop: 1310 virtqueue_push(q->tx_vq, elem, 0); 1311 virtio_notify(vdev, q->tx_vq); 1312 g_free(elem); 1313 1314 if (++num_packets >= n->tx_burst) { 1315 break; 1316 } 1317 } 1318 return num_packets; 1319 } 1320 1321 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1322 { 1323 VirtIONet *n = VIRTIO_NET(vdev); 1324 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1325 1326 /* This happens when device was stopped but VCPU wasn't. */ 1327 if (!vdev->vm_running) { 1328 q->tx_waiting = 1; 1329 return; 1330 } 1331 1332 if (q->tx_waiting) { 1333 virtio_queue_set_notification(vq, 1); 1334 timer_del(q->tx_timer); 1335 q->tx_waiting = 0; 1336 if (virtio_net_flush_tx(q) == -EINVAL) { 1337 return; 1338 } 1339 } else { 1340 timer_mod(q->tx_timer, 1341 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1342 q->tx_waiting = 1; 1343 virtio_queue_set_notification(vq, 0); 1344 } 1345 } 1346 1347 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1348 { 1349 VirtIONet *n = VIRTIO_NET(vdev); 1350 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1351 1352 if (unlikely(q->tx_waiting)) { 1353 return; 1354 } 1355 q->tx_waiting = 1; 1356 /* This happens when device was stopped but VCPU wasn't. */ 1357 if (!vdev->vm_running) { 1358 return; 1359 } 1360 virtio_queue_set_notification(vq, 0); 1361 qemu_bh_schedule(q->tx_bh); 1362 } 1363 1364 static void virtio_net_tx_timer(void *opaque) 1365 { 1366 VirtIONetQueue *q = opaque; 1367 VirtIONet *n = q->n; 1368 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1369 /* This happens when device was stopped but BH wasn't. */ 1370 if (!vdev->vm_running) { 1371 /* Make sure tx waiting is set, so we'll run when restarted. */ 1372 assert(q->tx_waiting); 1373 return; 1374 } 1375 1376 q->tx_waiting = 0; 1377 1378 /* Just in case the driver is not ready on more */ 1379 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1380 return; 1381 } 1382 1383 virtio_queue_set_notification(q->tx_vq, 1); 1384 virtio_net_flush_tx(q); 1385 } 1386 1387 static void virtio_net_tx_bh(void *opaque) 1388 { 1389 VirtIONetQueue *q = opaque; 1390 VirtIONet *n = q->n; 1391 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1392 int32_t ret; 1393 1394 /* This happens when device was stopped but BH wasn't. */ 1395 if (!vdev->vm_running) { 1396 /* Make sure tx waiting is set, so we'll run when restarted. */ 1397 assert(q->tx_waiting); 1398 return; 1399 } 1400 1401 q->tx_waiting = 0; 1402 1403 /* Just in case the driver is not ready on more */ 1404 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1405 return; 1406 } 1407 1408 ret = virtio_net_flush_tx(q); 1409 if (ret == -EBUSY || ret == -EINVAL) { 1410 return; /* Notification re-enable handled by tx_complete or device 1411 * broken */ 1412 } 1413 1414 /* If we flush a full burst of packets, assume there are 1415 * more coming and immediately reschedule */ 1416 if (ret >= n->tx_burst) { 1417 qemu_bh_schedule(q->tx_bh); 1418 q->tx_waiting = 1; 1419 return; 1420 } 1421 1422 /* If less than a full burst, re-enable notification and flush 1423 * anything that may have come in while we weren't looking. If 1424 * we find something, assume the guest is still active and reschedule */ 1425 virtio_queue_set_notification(q->tx_vq, 1); 1426 ret = virtio_net_flush_tx(q); 1427 if (ret == -EINVAL) { 1428 return; 1429 } else if (ret > 0) { 1430 virtio_queue_set_notification(q->tx_vq, 0); 1431 qemu_bh_schedule(q->tx_bh); 1432 q->tx_waiting = 1; 1433 } 1434 } 1435 1436 static void virtio_net_add_queue(VirtIONet *n, int index) 1437 { 1438 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1439 1440 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 1441 virtio_net_handle_rx); 1442 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1443 n->vqs[index].tx_vq = 1444 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1445 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1446 virtio_net_tx_timer, 1447 &n->vqs[index]); 1448 } else { 1449 n->vqs[index].tx_vq = 1450 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1451 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); 1452 } 1453 1454 n->vqs[index].tx_waiting = 0; 1455 n->vqs[index].n = n; 1456 } 1457 1458 static void virtio_net_del_queue(VirtIONet *n, int index) 1459 { 1460 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1461 VirtIONetQueue *q = &n->vqs[index]; 1462 NetClientState *nc = qemu_get_subqueue(n->nic, index); 1463 1464 qemu_purge_queued_packets(nc); 1465 1466 virtio_del_queue(vdev, index * 2); 1467 if (q->tx_timer) { 1468 timer_del(q->tx_timer); 1469 timer_free(q->tx_timer); 1470 } else { 1471 qemu_bh_delete(q->tx_bh); 1472 } 1473 virtio_del_queue(vdev, index * 2 + 1); 1474 } 1475 1476 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) 1477 { 1478 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1479 int old_num_queues = virtio_get_num_queues(vdev); 1480 int new_num_queues = new_max_queues * 2 + 1; 1481 int i; 1482 1483 assert(old_num_queues >= 3); 1484 assert(old_num_queues % 2 == 1); 1485 1486 if (old_num_queues == new_num_queues) { 1487 return; 1488 } 1489 1490 /* 1491 * We always need to remove and add ctrl vq if 1492 * old_num_queues != new_num_queues. Remove ctrl_vq first, 1493 * and then we only enter one of the following too loops. 1494 */ 1495 virtio_del_queue(vdev, old_num_queues - 1); 1496 1497 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 1498 /* new_num_queues < old_num_queues */ 1499 virtio_net_del_queue(n, i / 2); 1500 } 1501 1502 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 1503 /* new_num_queues > old_num_queues */ 1504 virtio_net_add_queue(n, i / 2); 1505 } 1506 1507 /* add ctrl_vq last */ 1508 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1509 } 1510 1511 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1512 { 1513 int max = multiqueue ? n->max_queues : 1; 1514 1515 n->multiqueue = multiqueue; 1516 virtio_net_change_num_queues(n, max); 1517 1518 virtio_net_set_queues(n); 1519 } 1520 1521 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1522 { 1523 VirtIONet *n = VIRTIO_NET(vdev); 1524 int i; 1525 1526 qemu_put_buffer(f, n->mac, ETH_ALEN); 1527 qemu_put_be32(f, n->vqs[0].tx_waiting); 1528 qemu_put_be32(f, n->mergeable_rx_bufs); 1529 qemu_put_be16(f, n->status); 1530 qemu_put_byte(f, n->promisc); 1531 qemu_put_byte(f, n->allmulti); 1532 qemu_put_be32(f, n->mac_table.in_use); 1533 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1534 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1535 qemu_put_be32(f, n->has_vnet_hdr); 1536 qemu_put_byte(f, n->mac_table.multi_overflow); 1537 qemu_put_byte(f, n->mac_table.uni_overflow); 1538 qemu_put_byte(f, n->alluni); 1539 qemu_put_byte(f, n->nomulti); 1540 qemu_put_byte(f, n->nouni); 1541 qemu_put_byte(f, n->nobcast); 1542 qemu_put_byte(f, n->has_ufo); 1543 if (n->max_queues > 1) { 1544 qemu_put_be16(f, n->max_queues); 1545 qemu_put_be16(f, n->curr_queues); 1546 for (i = 1; i < n->curr_queues; i++) { 1547 qemu_put_be32(f, n->vqs[i].tx_waiting); 1548 } 1549 } 1550 1551 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1552 qemu_put_be64(f, n->curr_guest_offloads); 1553 } 1554 } 1555 1556 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1557 int version_id) 1558 { 1559 VirtIONet *n = VIRTIO_NET(vdev); 1560 int i, link_down; 1561 1562 qemu_get_buffer(f, n->mac, ETH_ALEN); 1563 n->vqs[0].tx_waiting = qemu_get_be32(f); 1564 1565 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f), 1566 virtio_vdev_has_feature(vdev, 1567 VIRTIO_F_VERSION_1)); 1568 1569 n->status = qemu_get_be16(f); 1570 1571 n->promisc = qemu_get_byte(f); 1572 n->allmulti = qemu_get_byte(f); 1573 1574 n->mac_table.in_use = qemu_get_be32(f); 1575 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1576 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1577 qemu_get_buffer(f, n->mac_table.macs, 1578 n->mac_table.in_use * ETH_ALEN); 1579 } else { 1580 int64_t i; 1581 1582 /* Overflow detected - can happen if source has a larger MAC table. 1583 * We simply set overflow flag so there's no need to maintain the 1584 * table of addresses, discard them all. 1585 * Note: 64 bit math to avoid integer overflow. 1586 */ 1587 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1588 qemu_get_byte(f); 1589 } 1590 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1591 n->mac_table.in_use = 0; 1592 } 1593 1594 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1595 1596 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1597 error_report("virtio-net: saved image requires vnet_hdr=on"); 1598 return -1; 1599 } 1600 1601 n->mac_table.multi_overflow = qemu_get_byte(f); 1602 n->mac_table.uni_overflow = qemu_get_byte(f); 1603 1604 n->alluni = qemu_get_byte(f); 1605 n->nomulti = qemu_get_byte(f); 1606 n->nouni = qemu_get_byte(f); 1607 n->nobcast = qemu_get_byte(f); 1608 1609 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1610 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1611 return -1; 1612 } 1613 1614 if (n->max_queues > 1) { 1615 if (n->max_queues != qemu_get_be16(f)) { 1616 error_report("virtio-net: different max_queues "); 1617 return -1; 1618 } 1619 1620 n->curr_queues = qemu_get_be16(f); 1621 if (n->curr_queues > n->max_queues) { 1622 error_report("virtio-net: curr_queues %x > max_queues %x", 1623 n->curr_queues, n->max_queues); 1624 return -1; 1625 } 1626 for (i = 1; i < n->curr_queues; i++) { 1627 n->vqs[i].tx_waiting = qemu_get_be32(f); 1628 } 1629 } 1630 1631 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1632 n->curr_guest_offloads = qemu_get_be64(f); 1633 } else { 1634 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1635 } 1636 1637 if (peer_has_vnet_hdr(n)) { 1638 virtio_net_apply_guest_offloads(n); 1639 } 1640 1641 virtio_net_set_queues(n); 1642 1643 /* Find the first multicast entry in the saved MAC filter */ 1644 for (i = 0; i < n->mac_table.in_use; i++) { 1645 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1646 break; 1647 } 1648 } 1649 n->mac_table.first_multi = i; 1650 1651 /* nc.link_down can't be migrated, so infer link_down according 1652 * to link status bit in n->status */ 1653 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1654 for (i = 0; i < n->max_queues; i++) { 1655 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1656 } 1657 1658 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1659 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1660 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1661 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1662 } 1663 1664 return 0; 1665 } 1666 1667 static NetClientInfo net_virtio_info = { 1668 .type = NET_CLIENT_DRIVER_NIC, 1669 .size = sizeof(NICState), 1670 .can_receive = virtio_net_can_receive, 1671 .receive = virtio_net_receive, 1672 .link_status_changed = virtio_net_set_link_status, 1673 .query_rx_filter = virtio_net_query_rxfilter, 1674 }; 1675 1676 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1677 { 1678 VirtIONet *n = VIRTIO_NET(vdev); 1679 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1680 assert(n->vhost_started); 1681 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1682 } 1683 1684 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1685 bool mask) 1686 { 1687 VirtIONet *n = VIRTIO_NET(vdev); 1688 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1689 assert(n->vhost_started); 1690 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1691 vdev, idx, mask); 1692 } 1693 1694 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1695 { 1696 int i, config_size = 0; 1697 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1698 for (i = 0; feature_sizes[i].flags != 0; i++) { 1699 if (host_features & feature_sizes[i].flags) { 1700 config_size = MAX(feature_sizes[i].end, config_size); 1701 } 1702 } 1703 n->config_size = config_size; 1704 } 1705 1706 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1707 const char *type) 1708 { 1709 /* 1710 * The name can be NULL, the netclient name will be type.x. 1711 */ 1712 assert(type != NULL); 1713 1714 g_free(n->netclient_name); 1715 g_free(n->netclient_type); 1716 n->netclient_name = g_strdup(name); 1717 n->netclient_type = g_strdup(type); 1718 } 1719 1720 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1721 { 1722 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1723 VirtIONet *n = VIRTIO_NET(dev); 1724 NetClientState *nc; 1725 int i; 1726 1727 virtio_net_set_config_size(n, n->host_features); 1728 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1729 1730 /* 1731 * We set a lower limit on RX queue size to what it always was. 1732 * Guests that want a smaller ring can always resize it without 1733 * help from us (using virtio 1 and up). 1734 */ 1735 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 1736 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 1737 (n->net_conf.rx_queue_size & (n->net_conf.rx_queue_size - 1))) { 1738 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 1739 "must be a power of 2 between %d and %d.", 1740 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 1741 VIRTQUEUE_MAX_SIZE); 1742 virtio_cleanup(vdev); 1743 return; 1744 } 1745 1746 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1747 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 1748 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1749 "must be a positive integer less than %d.", 1750 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 1751 virtio_cleanup(vdev); 1752 return; 1753 } 1754 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1755 n->curr_queues = 1; 1756 n->tx_timeout = n->net_conf.txtimer; 1757 1758 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1759 && strcmp(n->net_conf.tx, "bh")) { 1760 error_report("virtio-net: " 1761 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1762 n->net_conf.tx); 1763 error_report("Defaulting to \"bh\""); 1764 } 1765 1766 for (i = 0; i < n->max_queues; i++) { 1767 virtio_net_add_queue(n, i); 1768 } 1769 1770 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1771 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1772 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1773 n->status = VIRTIO_NET_S_LINK_UP; 1774 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1775 virtio_net_announce_timer, n); 1776 1777 if (n->netclient_type) { 1778 /* 1779 * Happen when virtio_net_set_netclient_name has been called. 1780 */ 1781 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1782 n->netclient_type, n->netclient_name, n); 1783 } else { 1784 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1785 object_get_typename(OBJECT(dev)), dev->id, n); 1786 } 1787 1788 peer_test_vnet_hdr(n); 1789 if (peer_has_vnet_hdr(n)) { 1790 for (i = 0; i < n->max_queues; i++) { 1791 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1792 } 1793 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1794 } else { 1795 n->host_hdr_len = 0; 1796 } 1797 1798 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1799 1800 n->vqs[0].tx_waiting = 0; 1801 n->tx_burst = n->net_conf.txburst; 1802 virtio_net_set_mrg_rx_bufs(n, 0, 0); 1803 n->promisc = 1; /* for compatibility */ 1804 1805 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1806 1807 n->vlans = g_malloc0(MAX_VLAN >> 3); 1808 1809 nc = qemu_get_queue(n->nic); 1810 nc->rxfilter_notify_enabled = 1; 1811 1812 n->qdev = dev; 1813 } 1814 1815 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1816 { 1817 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1818 VirtIONet *n = VIRTIO_NET(dev); 1819 int i, max_queues; 1820 1821 /* This will stop vhost backend if appropriate. */ 1822 virtio_net_set_status(vdev, 0); 1823 1824 g_free(n->netclient_name); 1825 n->netclient_name = NULL; 1826 g_free(n->netclient_type); 1827 n->netclient_type = NULL; 1828 1829 g_free(n->mac_table.macs); 1830 g_free(n->vlans); 1831 1832 max_queues = n->multiqueue ? n->max_queues : 1; 1833 for (i = 0; i < max_queues; i++) { 1834 virtio_net_del_queue(n, i); 1835 } 1836 1837 timer_del(n->announce_timer); 1838 timer_free(n->announce_timer); 1839 g_free(n->vqs); 1840 qemu_del_nic(n->nic); 1841 virtio_cleanup(vdev); 1842 } 1843 1844 static void virtio_net_instance_init(Object *obj) 1845 { 1846 VirtIONet *n = VIRTIO_NET(obj); 1847 1848 /* 1849 * The default config_size is sizeof(struct virtio_net_config). 1850 * Can be overriden with virtio_net_set_config_size. 1851 */ 1852 n->config_size = sizeof(struct virtio_net_config); 1853 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 1854 "bootindex", "/ethernet-phy@0", 1855 DEVICE(n), NULL); 1856 } 1857 1858 static void virtio_net_pre_save(void *opaque) 1859 { 1860 VirtIONet *n = opaque; 1861 1862 /* At this point, backend must be stopped, otherwise 1863 * it might keep writing to memory. */ 1864 assert(!n->vhost_started); 1865 } 1866 1867 static const VMStateDescription vmstate_virtio_net = { 1868 .name = "virtio-net", 1869 .minimum_version_id = VIRTIO_NET_VM_VERSION, 1870 .version_id = VIRTIO_NET_VM_VERSION, 1871 .fields = (VMStateField[]) { 1872 VMSTATE_VIRTIO_DEVICE, 1873 VMSTATE_END_OF_LIST() 1874 }, 1875 .pre_save = virtio_net_pre_save, 1876 }; 1877 1878 static Property virtio_net_properties[] = { 1879 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), 1880 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, 1881 VIRTIO_NET_F_GUEST_CSUM, true), 1882 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 1883 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, 1884 VIRTIO_NET_F_GUEST_TSO4, true), 1885 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, 1886 VIRTIO_NET_F_GUEST_TSO6, true), 1887 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, 1888 VIRTIO_NET_F_GUEST_ECN, true), 1889 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, 1890 VIRTIO_NET_F_GUEST_UFO, true), 1891 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, 1892 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 1893 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, 1894 VIRTIO_NET_F_HOST_TSO4, true), 1895 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, 1896 VIRTIO_NET_F_HOST_TSO6, true), 1897 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, 1898 VIRTIO_NET_F_HOST_ECN, true), 1899 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, 1900 VIRTIO_NET_F_HOST_UFO, true), 1901 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, 1902 VIRTIO_NET_F_MRG_RXBUF, true), 1903 DEFINE_PROP_BIT("status", VirtIONet, host_features, 1904 VIRTIO_NET_F_STATUS, true), 1905 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, 1906 VIRTIO_NET_F_CTRL_VQ, true), 1907 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, 1908 VIRTIO_NET_F_CTRL_RX, true), 1909 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, 1910 VIRTIO_NET_F_CTRL_VLAN, true), 1911 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, 1912 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 1913 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, 1914 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 1915 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, 1916 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 1917 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 1918 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1919 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1920 TX_TIMER_INTERVAL), 1921 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1922 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1923 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 1924 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 1925 DEFINE_PROP_END_OF_LIST(), 1926 }; 1927 1928 static void virtio_net_class_init(ObjectClass *klass, void *data) 1929 { 1930 DeviceClass *dc = DEVICE_CLASS(klass); 1931 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1932 1933 dc->props = virtio_net_properties; 1934 dc->vmsd = &vmstate_virtio_net; 1935 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1936 vdc->realize = virtio_net_device_realize; 1937 vdc->unrealize = virtio_net_device_unrealize; 1938 vdc->get_config = virtio_net_get_config; 1939 vdc->set_config = virtio_net_set_config; 1940 vdc->get_features = virtio_net_get_features; 1941 vdc->set_features = virtio_net_set_features; 1942 vdc->bad_features = virtio_net_bad_features; 1943 vdc->reset = virtio_net_reset; 1944 vdc->set_status = virtio_net_set_status; 1945 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1946 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1947 vdc->load = virtio_net_load_device; 1948 vdc->save = virtio_net_save_device; 1949 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 1950 } 1951 1952 static const TypeInfo virtio_net_info = { 1953 .name = TYPE_VIRTIO_NET, 1954 .parent = TYPE_VIRTIO_DEVICE, 1955 .instance_size = sizeof(VirtIONet), 1956 .instance_init = virtio_net_instance_init, 1957 .class_init = virtio_net_class_init, 1958 }; 1959 1960 static void virtio_register_types(void) 1961 { 1962 type_register_static(&virtio_net_info); 1963 } 1964 1965 type_init(virtio_register_types) 1966