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/iov.h" 15 #include "hw/virtio/virtio.h" 16 #include "net/net.h" 17 #include "net/checksum.h" 18 #include "net/tap.h" 19 #include "qemu/error-report.h" 20 #include "qemu/timer.h" 21 #include "hw/virtio/virtio-net.h" 22 #include "net/vhost_net.h" 23 #include "hw/virtio/virtio-bus.h" 24 #include "qapi/qmp/qjson.h" 25 #include "qapi-event.h" 26 #include "hw/virtio/virtio-access.h" 27 28 #define VIRTIO_NET_VM_VERSION 11 29 30 #define MAC_TABLE_ENTRIES 64 31 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 32 33 /* 34 * Calculate the number of bytes up to and including the given 'field' of 35 * 'container'. 36 */ 37 #define endof(container, field) \ 38 (offsetof(container, field) + sizeof(((container *)0)->field)) 39 40 typedef struct VirtIOFeature { 41 uint32_t flags; 42 size_t end; 43 } VirtIOFeature; 44 45 static VirtIOFeature feature_sizes[] = { 46 {.flags = 1 << VIRTIO_NET_F_MAC, 47 .end = endof(struct virtio_net_config, mac)}, 48 {.flags = 1 << VIRTIO_NET_F_STATUS, 49 .end = endof(struct virtio_net_config, status)}, 50 {.flags = 1 << VIRTIO_NET_F_MQ, 51 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 52 {} 53 }; 54 55 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 56 { 57 VirtIONet *n = qemu_get_nic_opaque(nc); 58 59 return &n->vqs[nc->queue_index]; 60 } 61 62 static int vq2q(int queue_index) 63 { 64 return queue_index / 2; 65 } 66 67 /* TODO 68 * - we could suppress RX interrupt if we were so inclined. 69 */ 70 71 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 72 { 73 VirtIONet *n = VIRTIO_NET(vdev); 74 struct virtio_net_config netcfg; 75 76 virtio_stw_p(vdev, &netcfg.status, n->status); 77 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 78 memcpy(netcfg.mac, n->mac, ETH_ALEN); 79 memcpy(config, &netcfg, n->config_size); 80 } 81 82 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 83 { 84 VirtIONet *n = VIRTIO_NET(vdev); 85 struct virtio_net_config netcfg = {}; 86 87 memcpy(&netcfg, config, n->config_size); 88 89 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 90 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1) && 91 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 92 memcpy(n->mac, netcfg.mac, ETH_ALEN); 93 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 94 } 95 } 96 97 static bool virtio_net_started(VirtIONet *n, uint8_t status) 98 { 99 VirtIODevice *vdev = VIRTIO_DEVICE(n); 100 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 101 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 102 } 103 104 static void virtio_net_announce_timer(void *opaque) 105 { 106 VirtIONet *n = opaque; 107 VirtIODevice *vdev = VIRTIO_DEVICE(n); 108 109 n->announce_counter--; 110 n->status |= VIRTIO_NET_S_ANNOUNCE; 111 virtio_notify_config(vdev); 112 } 113 114 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 115 { 116 VirtIODevice *vdev = VIRTIO_DEVICE(n); 117 NetClientState *nc = qemu_get_queue(n->nic); 118 int queues = n->multiqueue ? n->max_queues : 1; 119 120 if (!get_vhost_net(nc->peer)) { 121 return; 122 } 123 124 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 125 !!n->vhost_started) { 126 return; 127 } 128 if (!n->vhost_started) { 129 int r, i; 130 131 /* Any packets outstanding? Purge them to avoid touching rings 132 * when vhost is running. 133 */ 134 for (i = 0; i < queues; i++) { 135 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 136 137 /* Purge both directions: TX and RX. */ 138 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 139 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 140 } 141 142 n->vhost_started = 1; 143 r = vhost_net_start(vdev, n->nic->ncs, queues); 144 if (r < 0) { 145 error_report("unable to start vhost net: %d: " 146 "falling back on userspace virtio", -r); 147 n->vhost_started = 0; 148 } 149 } else { 150 vhost_net_stop(vdev, n->nic->ncs, queues); 151 n->vhost_started = 0; 152 } 153 } 154 155 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 156 { 157 VirtIONet *n = VIRTIO_NET(vdev); 158 VirtIONetQueue *q; 159 int i; 160 uint8_t queue_status; 161 162 virtio_net_vhost_status(n, status); 163 164 for (i = 0; i < n->max_queues; i++) { 165 q = &n->vqs[i]; 166 167 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 168 queue_status = 0; 169 } else { 170 queue_status = status; 171 } 172 173 if (!q->tx_waiting) { 174 continue; 175 } 176 177 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 178 if (q->tx_timer) { 179 timer_mod(q->tx_timer, 180 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 181 } else { 182 qemu_bh_schedule(q->tx_bh); 183 } 184 } else { 185 if (q->tx_timer) { 186 timer_del(q->tx_timer); 187 } else { 188 qemu_bh_cancel(q->tx_bh); 189 } 190 } 191 } 192 } 193 194 static void virtio_net_set_link_status(NetClientState *nc) 195 { 196 VirtIONet *n = qemu_get_nic_opaque(nc); 197 VirtIODevice *vdev = VIRTIO_DEVICE(n); 198 uint16_t old_status = n->status; 199 200 if (nc->link_down) 201 n->status &= ~VIRTIO_NET_S_LINK_UP; 202 else 203 n->status |= VIRTIO_NET_S_LINK_UP; 204 205 if (n->status != old_status) 206 virtio_notify_config(vdev); 207 208 virtio_net_set_status(vdev, vdev->status); 209 } 210 211 static void rxfilter_notify(NetClientState *nc) 212 { 213 VirtIONet *n = qemu_get_nic_opaque(nc); 214 215 if (nc->rxfilter_notify_enabled) { 216 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 217 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 218 n->netclient_name, path, &error_abort); 219 g_free(path); 220 221 /* disable event notification to avoid events flooding */ 222 nc->rxfilter_notify_enabled = 0; 223 } 224 } 225 226 static intList *get_vlan_table(VirtIONet *n) 227 { 228 intList *list, *entry; 229 int i, j; 230 231 list = NULL; 232 for (i = 0; i < MAX_VLAN >> 5; i++) { 233 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 234 if (n->vlans[i] & (1U << j)) { 235 entry = g_malloc0(sizeof(*entry)); 236 entry->value = (i << 5) + j; 237 entry->next = list; 238 list = entry; 239 } 240 } 241 } 242 243 return list; 244 } 245 246 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 247 { 248 VirtIONet *n = qemu_get_nic_opaque(nc); 249 VirtIODevice *vdev = VIRTIO_DEVICE(n); 250 RxFilterInfo *info; 251 strList *str_list, *entry; 252 int i; 253 254 info = g_malloc0(sizeof(*info)); 255 info->name = g_strdup(nc->name); 256 info->promiscuous = n->promisc; 257 258 if (n->nouni) { 259 info->unicast = RX_STATE_NONE; 260 } else if (n->alluni) { 261 info->unicast = RX_STATE_ALL; 262 } else { 263 info->unicast = RX_STATE_NORMAL; 264 } 265 266 if (n->nomulti) { 267 info->multicast = RX_STATE_NONE; 268 } else if (n->allmulti) { 269 info->multicast = RX_STATE_ALL; 270 } else { 271 info->multicast = RX_STATE_NORMAL; 272 } 273 274 info->broadcast_allowed = n->nobcast; 275 info->multicast_overflow = n->mac_table.multi_overflow; 276 info->unicast_overflow = n->mac_table.uni_overflow; 277 278 info->main_mac = qemu_mac_strdup_printf(n->mac); 279 280 str_list = NULL; 281 for (i = 0; i < n->mac_table.first_multi; i++) { 282 entry = g_malloc0(sizeof(*entry)); 283 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 284 entry->next = str_list; 285 str_list = entry; 286 } 287 info->unicast_table = str_list; 288 289 str_list = NULL; 290 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 291 entry = g_malloc0(sizeof(*entry)); 292 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 293 entry->next = str_list; 294 str_list = entry; 295 } 296 info->multicast_table = str_list; 297 info->vlan_table = get_vlan_table(n); 298 299 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 300 info->vlan = RX_STATE_ALL; 301 } else if (!info->vlan_table) { 302 info->vlan = RX_STATE_NONE; 303 } else { 304 info->vlan = RX_STATE_NORMAL; 305 } 306 307 /* enable event notification after query */ 308 nc->rxfilter_notify_enabled = 1; 309 310 return info; 311 } 312 313 static void virtio_net_reset(VirtIODevice *vdev) 314 { 315 VirtIONet *n = VIRTIO_NET(vdev); 316 317 /* Reset back to compatibility mode */ 318 n->promisc = 1; 319 n->allmulti = 0; 320 n->alluni = 0; 321 n->nomulti = 0; 322 n->nouni = 0; 323 n->nobcast = 0; 324 /* multiqueue is disabled by default */ 325 n->curr_queues = 1; 326 timer_del(n->announce_timer); 327 n->announce_counter = 0; 328 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 329 330 /* Flush any MAC and VLAN filter table state */ 331 n->mac_table.in_use = 0; 332 n->mac_table.first_multi = 0; 333 n->mac_table.multi_overflow = 0; 334 n->mac_table.uni_overflow = 0; 335 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 336 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 337 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 338 memset(n->vlans, 0, MAX_VLAN >> 3); 339 } 340 341 static void peer_test_vnet_hdr(VirtIONet *n) 342 { 343 NetClientState *nc = qemu_get_queue(n->nic); 344 if (!nc->peer) { 345 return; 346 } 347 348 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 349 } 350 351 static int peer_has_vnet_hdr(VirtIONet *n) 352 { 353 return n->has_vnet_hdr; 354 } 355 356 static int peer_has_ufo(VirtIONet *n) 357 { 358 if (!peer_has_vnet_hdr(n)) 359 return 0; 360 361 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 362 363 return n->has_ufo; 364 } 365 366 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 367 int version_1) 368 { 369 int i; 370 NetClientState *nc; 371 372 n->mergeable_rx_bufs = mergeable_rx_bufs; 373 374 if (version_1) { 375 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 376 } else { 377 n->guest_hdr_len = n->mergeable_rx_bufs ? 378 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 379 sizeof(struct virtio_net_hdr); 380 } 381 382 for (i = 0; i < n->max_queues; i++) { 383 nc = qemu_get_subqueue(n->nic, i); 384 385 if (peer_has_vnet_hdr(n) && 386 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 387 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 388 n->host_hdr_len = n->guest_hdr_len; 389 } 390 } 391 } 392 393 static int peer_attach(VirtIONet *n, int index) 394 { 395 NetClientState *nc = qemu_get_subqueue(n->nic, index); 396 397 if (!nc->peer) { 398 return 0; 399 } 400 401 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 402 return 0; 403 } 404 405 return tap_enable(nc->peer); 406 } 407 408 static int peer_detach(VirtIONet *n, int index) 409 { 410 NetClientState *nc = qemu_get_subqueue(n->nic, index); 411 412 if (!nc->peer) { 413 return 0; 414 } 415 416 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 417 return 0; 418 } 419 420 return tap_disable(nc->peer); 421 } 422 423 static void virtio_net_set_queues(VirtIONet *n) 424 { 425 int i; 426 int r; 427 428 for (i = 0; i < n->max_queues; i++) { 429 if (i < n->curr_queues) { 430 r = peer_attach(n, i); 431 assert(!r); 432 } else { 433 r = peer_detach(n, i); 434 assert(!r); 435 } 436 } 437 } 438 439 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 440 441 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features) 442 { 443 VirtIONet *n = VIRTIO_NET(vdev); 444 NetClientState *nc = qemu_get_queue(n->nic); 445 446 /* Firstly sync all virtio-net possible supported features */ 447 features |= n->host_features; 448 449 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 450 451 if (!peer_has_vnet_hdr(n)) { 452 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 453 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 454 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 455 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 456 457 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 458 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 459 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 460 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 461 } 462 463 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 464 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 465 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 466 } 467 468 if (!get_vhost_net(nc->peer)) { 469 virtio_add_feature(&features, VIRTIO_F_VERSION_1); 470 return features; 471 } 472 return vhost_net_get_features(get_vhost_net(nc->peer), features); 473 } 474 475 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 476 { 477 uint64_t features = 0; 478 479 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 480 * but also these: */ 481 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 482 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 483 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 484 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 485 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 486 487 return features; 488 } 489 490 static void virtio_net_apply_guest_offloads(VirtIONet *n) 491 { 492 qemu_set_offload(qemu_get_queue(n->nic)->peer, 493 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 494 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 495 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 496 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 497 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 498 } 499 500 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 501 { 502 static const uint64_t guest_offloads_mask = 503 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 504 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 505 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 506 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 507 (1ULL << VIRTIO_NET_F_GUEST_UFO); 508 509 return guest_offloads_mask & features; 510 } 511 512 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 513 { 514 VirtIODevice *vdev = VIRTIO_DEVICE(n); 515 return virtio_net_guest_offloads_by_features(vdev->guest_features); 516 } 517 518 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 519 { 520 VirtIONet *n = VIRTIO_NET(vdev); 521 int i; 522 523 virtio_net_set_multiqueue(n, 524 __virtio_has_feature(features, VIRTIO_NET_F_MQ)); 525 526 virtio_net_set_mrg_rx_bufs(n, 527 __virtio_has_feature(features, 528 VIRTIO_NET_F_MRG_RXBUF), 529 __virtio_has_feature(features, 530 VIRTIO_F_VERSION_1)); 531 532 if (n->has_vnet_hdr) { 533 n->curr_guest_offloads = 534 virtio_net_guest_offloads_by_features(features); 535 virtio_net_apply_guest_offloads(n); 536 } 537 538 for (i = 0; i < n->max_queues; i++) { 539 NetClientState *nc = qemu_get_subqueue(n->nic, i); 540 541 if (!get_vhost_net(nc->peer)) { 542 continue; 543 } 544 vhost_net_ack_features(get_vhost_net(nc->peer), features); 545 } 546 547 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 548 memset(n->vlans, 0, MAX_VLAN >> 3); 549 } else { 550 memset(n->vlans, 0xff, MAX_VLAN >> 3); 551 } 552 } 553 554 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 555 struct iovec *iov, unsigned int iov_cnt) 556 { 557 uint8_t on; 558 size_t s; 559 NetClientState *nc = qemu_get_queue(n->nic); 560 561 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 562 if (s != sizeof(on)) { 563 return VIRTIO_NET_ERR; 564 } 565 566 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 567 n->promisc = on; 568 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 569 n->allmulti = on; 570 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 571 n->alluni = on; 572 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 573 n->nomulti = on; 574 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 575 n->nouni = on; 576 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 577 n->nobcast = on; 578 } else { 579 return VIRTIO_NET_ERR; 580 } 581 582 rxfilter_notify(nc); 583 584 return VIRTIO_NET_OK; 585 } 586 587 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 588 struct iovec *iov, unsigned int iov_cnt) 589 { 590 VirtIODevice *vdev = VIRTIO_DEVICE(n); 591 uint64_t offloads; 592 size_t s; 593 594 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 595 return VIRTIO_NET_ERR; 596 } 597 598 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 599 if (s != sizeof(offloads)) { 600 return VIRTIO_NET_ERR; 601 } 602 603 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 604 uint64_t supported_offloads; 605 606 if (!n->has_vnet_hdr) { 607 return VIRTIO_NET_ERR; 608 } 609 610 supported_offloads = virtio_net_supported_guest_offloads(n); 611 if (offloads & ~supported_offloads) { 612 return VIRTIO_NET_ERR; 613 } 614 615 n->curr_guest_offloads = offloads; 616 virtio_net_apply_guest_offloads(n); 617 618 return VIRTIO_NET_OK; 619 } else { 620 return VIRTIO_NET_ERR; 621 } 622 } 623 624 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 625 struct iovec *iov, unsigned int iov_cnt) 626 { 627 VirtIODevice *vdev = VIRTIO_DEVICE(n); 628 struct virtio_net_ctrl_mac mac_data; 629 size_t s; 630 NetClientState *nc = qemu_get_queue(n->nic); 631 632 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 633 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 634 return VIRTIO_NET_ERR; 635 } 636 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 637 assert(s == sizeof(n->mac)); 638 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 639 rxfilter_notify(nc); 640 641 return VIRTIO_NET_OK; 642 } 643 644 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 645 return VIRTIO_NET_ERR; 646 } 647 648 int in_use = 0; 649 int first_multi = 0; 650 uint8_t uni_overflow = 0; 651 uint8_t multi_overflow = 0; 652 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 653 654 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 655 sizeof(mac_data.entries)); 656 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 657 if (s != sizeof(mac_data.entries)) { 658 goto error; 659 } 660 iov_discard_front(&iov, &iov_cnt, s); 661 662 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 663 goto error; 664 } 665 666 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 667 s = iov_to_buf(iov, iov_cnt, 0, macs, 668 mac_data.entries * ETH_ALEN); 669 if (s != mac_data.entries * ETH_ALEN) { 670 goto error; 671 } 672 in_use += mac_data.entries; 673 } else { 674 uni_overflow = 1; 675 } 676 677 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 678 679 first_multi = in_use; 680 681 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 682 sizeof(mac_data.entries)); 683 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 684 if (s != sizeof(mac_data.entries)) { 685 goto error; 686 } 687 688 iov_discard_front(&iov, &iov_cnt, s); 689 690 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 691 goto error; 692 } 693 694 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 695 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 696 mac_data.entries * ETH_ALEN); 697 if (s != mac_data.entries * ETH_ALEN) { 698 goto error; 699 } 700 in_use += mac_data.entries; 701 } else { 702 multi_overflow = 1; 703 } 704 705 n->mac_table.in_use = in_use; 706 n->mac_table.first_multi = first_multi; 707 n->mac_table.uni_overflow = uni_overflow; 708 n->mac_table.multi_overflow = multi_overflow; 709 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 710 g_free(macs); 711 rxfilter_notify(nc); 712 713 return VIRTIO_NET_OK; 714 715 error: 716 g_free(macs); 717 return VIRTIO_NET_ERR; 718 } 719 720 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 721 struct iovec *iov, unsigned int iov_cnt) 722 { 723 VirtIODevice *vdev = VIRTIO_DEVICE(n); 724 uint16_t vid; 725 size_t s; 726 NetClientState *nc = qemu_get_queue(n->nic); 727 728 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 729 vid = virtio_lduw_p(vdev, &vid); 730 if (s != sizeof(vid)) { 731 return VIRTIO_NET_ERR; 732 } 733 734 if (vid >= MAX_VLAN) 735 return VIRTIO_NET_ERR; 736 737 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 738 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 739 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 740 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 741 else 742 return VIRTIO_NET_ERR; 743 744 rxfilter_notify(nc); 745 746 return VIRTIO_NET_OK; 747 } 748 749 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 750 struct iovec *iov, unsigned int iov_cnt) 751 { 752 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 753 n->status & VIRTIO_NET_S_ANNOUNCE) { 754 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 755 if (n->announce_counter) { 756 timer_mod(n->announce_timer, 757 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 758 self_announce_delay(n->announce_counter)); 759 } 760 return VIRTIO_NET_OK; 761 } else { 762 return VIRTIO_NET_ERR; 763 } 764 } 765 766 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 767 struct iovec *iov, unsigned int iov_cnt) 768 { 769 VirtIODevice *vdev = VIRTIO_DEVICE(n); 770 struct virtio_net_ctrl_mq mq; 771 size_t s; 772 uint16_t queues; 773 774 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 775 if (s != sizeof(mq)) { 776 return VIRTIO_NET_ERR; 777 } 778 779 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 780 return VIRTIO_NET_ERR; 781 } 782 783 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 784 785 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 786 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 787 queues > n->max_queues || 788 !n->multiqueue) { 789 return VIRTIO_NET_ERR; 790 } 791 792 n->curr_queues = queues; 793 /* stop the backend before changing the number of queues to avoid handling a 794 * disabled queue */ 795 virtio_net_set_status(vdev, vdev->status); 796 virtio_net_set_queues(n); 797 798 return VIRTIO_NET_OK; 799 } 800 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 801 { 802 VirtIONet *n = VIRTIO_NET(vdev); 803 struct virtio_net_ctrl_hdr ctrl; 804 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 805 VirtQueueElement elem; 806 size_t s; 807 struct iovec *iov, *iov2; 808 unsigned int iov_cnt; 809 810 while (virtqueue_pop(vq, &elem)) { 811 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 812 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 813 error_report("virtio-net ctrl missing headers"); 814 exit(1); 815 } 816 817 iov_cnt = elem.out_num; 818 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num); 819 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 820 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 821 if (s != sizeof(ctrl)) { 822 status = VIRTIO_NET_ERR; 823 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 824 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 825 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 826 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 827 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 828 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 829 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 830 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 831 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 832 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 833 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 834 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 835 } 836 837 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 838 assert(s == sizeof(status)); 839 840 virtqueue_push(vq, &elem, sizeof(status)); 841 virtio_notify(vdev, vq); 842 g_free(iov2); 843 } 844 } 845 846 /* RX */ 847 848 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 849 { 850 VirtIONet *n = VIRTIO_NET(vdev); 851 int queue_index = vq2q(virtio_get_queue_index(vq)); 852 853 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 854 } 855 856 static int virtio_net_can_receive(NetClientState *nc) 857 { 858 VirtIONet *n = qemu_get_nic_opaque(nc); 859 VirtIODevice *vdev = VIRTIO_DEVICE(n); 860 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 861 862 if (!vdev->vm_running) { 863 return 0; 864 } 865 866 if (nc->queue_index >= n->curr_queues) { 867 return 0; 868 } 869 870 if (!virtio_queue_ready(q->rx_vq) || 871 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 872 return 0; 873 } 874 875 return 1; 876 } 877 878 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 879 { 880 VirtIONet *n = q->n; 881 if (virtio_queue_empty(q->rx_vq) || 882 (n->mergeable_rx_bufs && 883 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 884 virtio_queue_set_notification(q->rx_vq, 1); 885 886 /* To avoid a race condition where the guest has made some buffers 887 * available after the above check but before notification was 888 * enabled, check for available buffers again. 889 */ 890 if (virtio_queue_empty(q->rx_vq) || 891 (n->mergeable_rx_bufs && 892 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 893 return 0; 894 } 895 } 896 897 virtio_queue_set_notification(q->rx_vq, 0); 898 return 1; 899 } 900 901 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 902 { 903 virtio_tswap16s(vdev, &hdr->hdr_len); 904 virtio_tswap16s(vdev, &hdr->gso_size); 905 virtio_tswap16s(vdev, &hdr->csum_start); 906 virtio_tswap16s(vdev, &hdr->csum_offset); 907 } 908 909 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 910 * it never finds out that the packets don't have valid checksums. This 911 * causes dhclient to get upset. Fedora's carried a patch for ages to 912 * fix this with Xen but it hasn't appeared in an upstream release of 913 * dhclient yet. 914 * 915 * To avoid breaking existing guests, we catch udp packets and add 916 * checksums. This is terrible but it's better than hacking the guest 917 * kernels. 918 * 919 * N.B. if we introduce a zero-copy API, this operation is no longer free so 920 * we should provide a mechanism to disable it to avoid polluting the host 921 * cache. 922 */ 923 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 924 uint8_t *buf, size_t size) 925 { 926 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 927 (size > 27 && size < 1500) && /* normal sized MTU */ 928 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 929 (buf[23] == 17) && /* ip.protocol == UDP */ 930 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 931 net_checksum_calculate(buf, size); 932 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 933 } 934 } 935 936 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 937 const void *buf, size_t size) 938 { 939 if (n->has_vnet_hdr) { 940 /* FIXME this cast is evil */ 941 void *wbuf = (void *)buf; 942 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 943 size - n->host_hdr_len); 944 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 945 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 946 } else { 947 struct virtio_net_hdr hdr = { 948 .flags = 0, 949 .gso_type = VIRTIO_NET_HDR_GSO_NONE 950 }; 951 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 952 } 953 } 954 955 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 956 { 957 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 958 static const uint8_t vlan[] = {0x81, 0x00}; 959 uint8_t *ptr = (uint8_t *)buf; 960 int i; 961 962 if (n->promisc) 963 return 1; 964 965 ptr += n->host_hdr_len; 966 967 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 968 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 969 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 970 return 0; 971 } 972 973 if (ptr[0] & 1) { // multicast 974 if (!memcmp(ptr, bcast, sizeof(bcast))) { 975 return !n->nobcast; 976 } else if (n->nomulti) { 977 return 0; 978 } else if (n->allmulti || n->mac_table.multi_overflow) { 979 return 1; 980 } 981 982 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 983 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 984 return 1; 985 } 986 } 987 } else { // unicast 988 if (n->nouni) { 989 return 0; 990 } else if (n->alluni || n->mac_table.uni_overflow) { 991 return 1; 992 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 993 return 1; 994 } 995 996 for (i = 0; i < n->mac_table.first_multi; i++) { 997 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 998 return 1; 999 } 1000 } 1001 } 1002 1003 return 0; 1004 } 1005 1006 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 1007 { 1008 VirtIONet *n = qemu_get_nic_opaque(nc); 1009 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1010 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1011 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1012 struct virtio_net_hdr_mrg_rxbuf mhdr; 1013 unsigned mhdr_cnt = 0; 1014 size_t offset, i, guest_offset; 1015 1016 if (!virtio_net_can_receive(nc)) { 1017 return -1; 1018 } 1019 1020 /* hdr_len refers to the header we supply to the guest */ 1021 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1022 return 0; 1023 } 1024 1025 if (!receive_filter(n, buf, size)) 1026 return size; 1027 1028 offset = i = 0; 1029 1030 while (offset < size) { 1031 VirtQueueElement elem; 1032 int len, total; 1033 const struct iovec *sg = elem.in_sg; 1034 1035 total = 0; 1036 1037 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1038 if (i == 0) 1039 return -1; 1040 error_report("virtio-net unexpected empty queue: " 1041 "i %zd mergeable %d offset %zd, size %zd, " 1042 "guest hdr len %zd, host hdr len %zd " 1043 "guest features 0x%" PRIx64, 1044 i, n->mergeable_rx_bufs, offset, size, 1045 n->guest_hdr_len, n->host_hdr_len, 1046 vdev->guest_features); 1047 exit(1); 1048 } 1049 1050 if (elem.in_num < 1) { 1051 error_report("virtio-net receive queue contains no in buffers"); 1052 exit(1); 1053 } 1054 1055 if (i == 0) { 1056 assert(offset == 0); 1057 if (n->mergeable_rx_bufs) { 1058 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1059 sg, elem.in_num, 1060 offsetof(typeof(mhdr), num_buffers), 1061 sizeof(mhdr.num_buffers)); 1062 } 1063 1064 receive_header(n, sg, elem.in_num, buf, size); 1065 offset = n->host_hdr_len; 1066 total += n->guest_hdr_len; 1067 guest_offset = n->guest_hdr_len; 1068 } else { 1069 guest_offset = 0; 1070 } 1071 1072 /* copy in packet. ugh */ 1073 len = iov_from_buf(sg, elem.in_num, guest_offset, 1074 buf + offset, size - offset); 1075 total += len; 1076 offset += len; 1077 /* If buffers can't be merged, at this point we 1078 * must have consumed the complete packet. 1079 * Otherwise, drop it. */ 1080 if (!n->mergeable_rx_bufs && offset < size) { 1081 #if 0 1082 error_report("virtio-net truncated non-mergeable packet: " 1083 "i %zd mergeable %d offset %zd, size %zd, " 1084 "guest hdr len %zd, host hdr len %zd", 1085 i, n->mergeable_rx_bufs, 1086 offset, size, n->guest_hdr_len, n->host_hdr_len); 1087 #endif 1088 return size; 1089 } 1090 1091 /* signal other side */ 1092 virtqueue_fill(q->rx_vq, &elem, total, i++); 1093 } 1094 1095 if (mhdr_cnt) { 1096 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1097 iov_from_buf(mhdr_sg, mhdr_cnt, 1098 0, 1099 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1100 } 1101 1102 virtqueue_flush(q->rx_vq, i); 1103 virtio_notify(vdev, q->rx_vq); 1104 1105 return size; 1106 } 1107 1108 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1109 1110 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1111 { 1112 VirtIONet *n = qemu_get_nic_opaque(nc); 1113 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1114 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1115 1116 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1117 virtio_notify(vdev, q->tx_vq); 1118 1119 q->async_tx.elem.out_num = q->async_tx.len = 0; 1120 1121 virtio_queue_set_notification(q->tx_vq, 1); 1122 virtio_net_flush_tx(q); 1123 } 1124 1125 /* TX */ 1126 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1127 { 1128 VirtIONet *n = q->n; 1129 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1130 VirtQueueElement elem; 1131 int32_t num_packets = 0; 1132 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1133 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1134 return num_packets; 1135 } 1136 1137 if (q->async_tx.elem.out_num) { 1138 virtio_queue_set_notification(q->tx_vq, 0); 1139 return num_packets; 1140 } 1141 1142 while (virtqueue_pop(q->tx_vq, &elem)) { 1143 ssize_t ret, len; 1144 unsigned int out_num = elem.out_num; 1145 struct iovec *out_sg = &elem.out_sg[0]; 1146 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1147 1148 if (out_num < 1) { 1149 error_report("virtio-net header not in first element"); 1150 exit(1); 1151 } 1152 1153 if (n->has_vnet_hdr) { 1154 if (out_sg[0].iov_len < n->guest_hdr_len) { 1155 error_report("virtio-net header incorrect"); 1156 exit(1); 1157 } 1158 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); 1159 } 1160 1161 /* 1162 * If host wants to see the guest header as is, we can 1163 * pass it on unchanged. Otherwise, copy just the parts 1164 * that host is interested in. 1165 */ 1166 assert(n->host_hdr_len <= n->guest_hdr_len); 1167 if (n->host_hdr_len != n->guest_hdr_len) { 1168 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1169 out_sg, out_num, 1170 0, n->host_hdr_len); 1171 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1172 out_sg, out_num, 1173 n->guest_hdr_len, -1); 1174 out_num = sg_num; 1175 out_sg = sg; 1176 } 1177 1178 len = n->guest_hdr_len; 1179 1180 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1181 out_sg, out_num, virtio_net_tx_complete); 1182 if (ret == 0) { 1183 virtio_queue_set_notification(q->tx_vq, 0); 1184 q->async_tx.elem = elem; 1185 q->async_tx.len = len; 1186 return -EBUSY; 1187 } 1188 1189 len += ret; 1190 1191 virtqueue_push(q->tx_vq, &elem, 0); 1192 virtio_notify(vdev, q->tx_vq); 1193 1194 if (++num_packets >= n->tx_burst) { 1195 break; 1196 } 1197 } 1198 return num_packets; 1199 } 1200 1201 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1202 { 1203 VirtIONet *n = VIRTIO_NET(vdev); 1204 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1205 1206 /* This happens when device was stopped but VCPU wasn't. */ 1207 if (!vdev->vm_running) { 1208 q->tx_waiting = 1; 1209 return; 1210 } 1211 1212 if (q->tx_waiting) { 1213 virtio_queue_set_notification(vq, 1); 1214 timer_del(q->tx_timer); 1215 q->tx_waiting = 0; 1216 virtio_net_flush_tx(q); 1217 } else { 1218 timer_mod(q->tx_timer, 1219 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1220 q->tx_waiting = 1; 1221 virtio_queue_set_notification(vq, 0); 1222 } 1223 } 1224 1225 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1226 { 1227 VirtIONet *n = VIRTIO_NET(vdev); 1228 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1229 1230 if (unlikely(q->tx_waiting)) { 1231 return; 1232 } 1233 q->tx_waiting = 1; 1234 /* This happens when device was stopped but VCPU wasn't. */ 1235 if (!vdev->vm_running) { 1236 return; 1237 } 1238 virtio_queue_set_notification(vq, 0); 1239 qemu_bh_schedule(q->tx_bh); 1240 } 1241 1242 static void virtio_net_tx_timer(void *opaque) 1243 { 1244 VirtIONetQueue *q = opaque; 1245 VirtIONet *n = q->n; 1246 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1247 /* This happens when device was stopped but BH wasn't. */ 1248 if (!vdev->vm_running) { 1249 /* Make sure tx waiting is set, so we'll run when restarted. */ 1250 assert(q->tx_waiting); 1251 return; 1252 } 1253 1254 q->tx_waiting = 0; 1255 1256 /* Just in case the driver is not ready on more */ 1257 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1258 return; 1259 } 1260 1261 virtio_queue_set_notification(q->tx_vq, 1); 1262 virtio_net_flush_tx(q); 1263 } 1264 1265 static void virtio_net_tx_bh(void *opaque) 1266 { 1267 VirtIONetQueue *q = opaque; 1268 VirtIONet *n = q->n; 1269 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1270 int32_t ret; 1271 1272 /* This happens when device was stopped but BH wasn't. */ 1273 if (!vdev->vm_running) { 1274 /* Make sure tx waiting is set, so we'll run when restarted. */ 1275 assert(q->tx_waiting); 1276 return; 1277 } 1278 1279 q->tx_waiting = 0; 1280 1281 /* Just in case the driver is not ready on more */ 1282 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1283 return; 1284 } 1285 1286 ret = virtio_net_flush_tx(q); 1287 if (ret == -EBUSY) { 1288 return; /* Notification re-enable handled by tx_complete */ 1289 } 1290 1291 /* If we flush a full burst of packets, assume there are 1292 * more coming and immediately reschedule */ 1293 if (ret >= n->tx_burst) { 1294 qemu_bh_schedule(q->tx_bh); 1295 q->tx_waiting = 1; 1296 return; 1297 } 1298 1299 /* If less than a full burst, re-enable notification and flush 1300 * anything that may have come in while we weren't looking. If 1301 * we find something, assume the guest is still active and reschedule */ 1302 virtio_queue_set_notification(q->tx_vq, 1); 1303 if (virtio_net_flush_tx(q) > 0) { 1304 virtio_queue_set_notification(q->tx_vq, 0); 1305 qemu_bh_schedule(q->tx_bh); 1306 q->tx_waiting = 1; 1307 } 1308 } 1309 1310 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1311 { 1312 n->multiqueue = multiqueue; 1313 1314 virtio_net_set_queues(n); 1315 } 1316 1317 static void virtio_net_save(QEMUFile *f, void *opaque) 1318 { 1319 VirtIONet *n = opaque; 1320 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1321 1322 /* At this point, backend must be stopped, otherwise 1323 * it might keep writing to memory. */ 1324 assert(!n->vhost_started); 1325 virtio_save(vdev, f); 1326 } 1327 1328 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1329 { 1330 VirtIONet *n = VIRTIO_NET(vdev); 1331 int i; 1332 1333 qemu_put_buffer(f, n->mac, ETH_ALEN); 1334 qemu_put_be32(f, n->vqs[0].tx_waiting); 1335 qemu_put_be32(f, n->mergeable_rx_bufs); 1336 qemu_put_be16(f, n->status); 1337 qemu_put_byte(f, n->promisc); 1338 qemu_put_byte(f, n->allmulti); 1339 qemu_put_be32(f, n->mac_table.in_use); 1340 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1341 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1342 qemu_put_be32(f, n->has_vnet_hdr); 1343 qemu_put_byte(f, n->mac_table.multi_overflow); 1344 qemu_put_byte(f, n->mac_table.uni_overflow); 1345 qemu_put_byte(f, n->alluni); 1346 qemu_put_byte(f, n->nomulti); 1347 qemu_put_byte(f, n->nouni); 1348 qemu_put_byte(f, n->nobcast); 1349 qemu_put_byte(f, n->has_ufo); 1350 if (n->max_queues > 1) { 1351 qemu_put_be16(f, n->max_queues); 1352 qemu_put_be16(f, n->curr_queues); 1353 for (i = 1; i < n->curr_queues; i++) { 1354 qemu_put_be32(f, n->vqs[i].tx_waiting); 1355 } 1356 } 1357 1358 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1359 qemu_put_be64(f, n->curr_guest_offloads); 1360 } 1361 } 1362 1363 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1364 { 1365 VirtIONet *n = opaque; 1366 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1367 1368 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1369 return -EINVAL; 1370 1371 return virtio_load(vdev, f, version_id); 1372 } 1373 1374 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1375 int version_id) 1376 { 1377 VirtIONet *n = VIRTIO_NET(vdev); 1378 int i, link_down; 1379 1380 qemu_get_buffer(f, n->mac, ETH_ALEN); 1381 n->vqs[0].tx_waiting = qemu_get_be32(f); 1382 1383 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f), 1384 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)); 1385 1386 if (version_id >= 3) 1387 n->status = qemu_get_be16(f); 1388 1389 if (version_id >= 4) { 1390 if (version_id < 8) { 1391 n->promisc = qemu_get_be32(f); 1392 n->allmulti = qemu_get_be32(f); 1393 } else { 1394 n->promisc = qemu_get_byte(f); 1395 n->allmulti = qemu_get_byte(f); 1396 } 1397 } 1398 1399 if (version_id >= 5) { 1400 n->mac_table.in_use = qemu_get_be32(f); 1401 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1402 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1403 qemu_get_buffer(f, n->mac_table.macs, 1404 n->mac_table.in_use * ETH_ALEN); 1405 } else { 1406 int64_t i; 1407 1408 /* Overflow detected - can happen if source has a larger MAC table. 1409 * We simply set overflow flag so there's no need to maintain the 1410 * table of addresses, discard them all. 1411 * Note: 64 bit math to avoid integer overflow. 1412 */ 1413 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1414 qemu_get_byte(f); 1415 } 1416 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1417 n->mac_table.in_use = 0; 1418 } 1419 } 1420 1421 if (version_id >= 6) 1422 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1423 1424 if (version_id >= 7) { 1425 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1426 error_report("virtio-net: saved image requires vnet_hdr=on"); 1427 return -1; 1428 } 1429 } 1430 1431 if (version_id >= 9) { 1432 n->mac_table.multi_overflow = qemu_get_byte(f); 1433 n->mac_table.uni_overflow = qemu_get_byte(f); 1434 } 1435 1436 if (version_id >= 10) { 1437 n->alluni = qemu_get_byte(f); 1438 n->nomulti = qemu_get_byte(f); 1439 n->nouni = qemu_get_byte(f); 1440 n->nobcast = qemu_get_byte(f); 1441 } 1442 1443 if (version_id >= 11) { 1444 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1445 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1446 return -1; 1447 } 1448 } 1449 1450 if (n->max_queues > 1) { 1451 if (n->max_queues != qemu_get_be16(f)) { 1452 error_report("virtio-net: different max_queues "); 1453 return -1; 1454 } 1455 1456 n->curr_queues = qemu_get_be16(f); 1457 if (n->curr_queues > n->max_queues) { 1458 error_report("virtio-net: curr_queues %x > max_queues %x", 1459 n->curr_queues, n->max_queues); 1460 return -1; 1461 } 1462 for (i = 1; i < n->curr_queues; i++) { 1463 n->vqs[i].tx_waiting = qemu_get_be32(f); 1464 } 1465 } 1466 1467 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1468 n->curr_guest_offloads = qemu_get_be64(f); 1469 } else { 1470 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1471 } 1472 1473 if (peer_has_vnet_hdr(n)) { 1474 virtio_net_apply_guest_offloads(n); 1475 } 1476 1477 virtio_net_set_queues(n); 1478 1479 /* Find the first multicast entry in the saved MAC filter */ 1480 for (i = 0; i < n->mac_table.in_use; i++) { 1481 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1482 break; 1483 } 1484 } 1485 n->mac_table.first_multi = i; 1486 1487 /* nc.link_down can't be migrated, so infer link_down according 1488 * to link status bit in n->status */ 1489 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1490 for (i = 0; i < n->max_queues; i++) { 1491 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1492 } 1493 1494 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1495 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1496 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1497 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1498 } 1499 1500 return 0; 1501 } 1502 1503 static NetClientInfo net_virtio_info = { 1504 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1505 .size = sizeof(NICState), 1506 .can_receive = virtio_net_can_receive, 1507 .receive = virtio_net_receive, 1508 .link_status_changed = virtio_net_set_link_status, 1509 .query_rx_filter = virtio_net_query_rxfilter, 1510 }; 1511 1512 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1513 { 1514 VirtIONet *n = VIRTIO_NET(vdev); 1515 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1516 assert(n->vhost_started); 1517 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1518 } 1519 1520 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1521 bool mask) 1522 { 1523 VirtIONet *n = VIRTIO_NET(vdev); 1524 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1525 assert(n->vhost_started); 1526 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1527 vdev, idx, mask); 1528 } 1529 1530 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1531 { 1532 int i, config_size = 0; 1533 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1534 for (i = 0; feature_sizes[i].flags != 0; i++) { 1535 if (host_features & feature_sizes[i].flags) { 1536 config_size = MAX(feature_sizes[i].end, config_size); 1537 } 1538 } 1539 n->config_size = config_size; 1540 } 1541 1542 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1543 const char *type) 1544 { 1545 /* 1546 * The name can be NULL, the netclient name will be type.x. 1547 */ 1548 assert(type != NULL); 1549 1550 g_free(n->netclient_name); 1551 g_free(n->netclient_type); 1552 n->netclient_name = g_strdup(name); 1553 n->netclient_type = g_strdup(type); 1554 } 1555 1556 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1557 { 1558 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1559 VirtIONet *n = VIRTIO_NET(dev); 1560 NetClientState *nc; 1561 int i; 1562 1563 virtio_net_set_config_size(n, n->host_features); 1564 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1565 1566 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1567 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 1568 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1569 "must be a positive integer less than %d.", 1570 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 1571 virtio_cleanup(vdev); 1572 return; 1573 } 1574 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1575 n->curr_queues = 1; 1576 n->tx_timeout = n->net_conf.txtimer; 1577 1578 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1579 && strcmp(n->net_conf.tx, "bh")) { 1580 error_report("virtio-net: " 1581 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1582 n->net_conf.tx); 1583 error_report("Defaulting to \"bh\""); 1584 } 1585 1586 for (i = 0; i < n->max_queues; i++) { 1587 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1588 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1589 n->vqs[i].tx_vq = 1590 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1591 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1592 virtio_net_tx_timer, 1593 &n->vqs[i]); 1594 } else { 1595 n->vqs[i].tx_vq = 1596 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1597 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1598 } 1599 1600 n->vqs[i].tx_waiting = 0; 1601 n->vqs[i].n = n; 1602 } 1603 1604 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1605 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1606 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1607 n->status = VIRTIO_NET_S_LINK_UP; 1608 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1609 virtio_net_announce_timer, n); 1610 1611 if (n->netclient_type) { 1612 /* 1613 * Happen when virtio_net_set_netclient_name has been called. 1614 */ 1615 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1616 n->netclient_type, n->netclient_name, n); 1617 } else { 1618 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1619 object_get_typename(OBJECT(dev)), dev->id, n); 1620 } 1621 1622 peer_test_vnet_hdr(n); 1623 if (peer_has_vnet_hdr(n)) { 1624 for (i = 0; i < n->max_queues; i++) { 1625 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1626 } 1627 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1628 } else { 1629 n->host_hdr_len = 0; 1630 } 1631 1632 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1633 1634 n->vqs[0].tx_waiting = 0; 1635 n->tx_burst = n->net_conf.txburst; 1636 virtio_net_set_mrg_rx_bufs(n, 0, 0); 1637 n->promisc = 1; /* for compatibility */ 1638 1639 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1640 1641 n->vlans = g_malloc0(MAX_VLAN >> 3); 1642 1643 nc = qemu_get_queue(n->nic); 1644 nc->rxfilter_notify_enabled = 1; 1645 1646 n->qdev = dev; 1647 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1648 virtio_net_save, virtio_net_load, n); 1649 } 1650 1651 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1652 { 1653 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1654 VirtIONet *n = VIRTIO_NET(dev); 1655 int i; 1656 1657 /* This will stop vhost backend if appropriate. */ 1658 virtio_net_set_status(vdev, 0); 1659 1660 unregister_savevm(dev, "virtio-net", n); 1661 1662 g_free(n->netclient_name); 1663 n->netclient_name = NULL; 1664 g_free(n->netclient_type); 1665 n->netclient_type = NULL; 1666 1667 g_free(n->mac_table.macs); 1668 g_free(n->vlans); 1669 1670 for (i = 0; i < n->max_queues; i++) { 1671 VirtIONetQueue *q = &n->vqs[i]; 1672 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1673 1674 qemu_purge_queued_packets(nc); 1675 1676 if (q->tx_timer) { 1677 timer_del(q->tx_timer); 1678 timer_free(q->tx_timer); 1679 } else if (q->tx_bh) { 1680 qemu_bh_delete(q->tx_bh); 1681 } 1682 } 1683 1684 timer_del(n->announce_timer); 1685 timer_free(n->announce_timer); 1686 g_free(n->vqs); 1687 qemu_del_nic(n->nic); 1688 virtio_cleanup(vdev); 1689 } 1690 1691 static void virtio_net_instance_init(Object *obj) 1692 { 1693 VirtIONet *n = VIRTIO_NET(obj); 1694 1695 /* 1696 * The default config_size is sizeof(struct virtio_net_config). 1697 * Can be overriden with virtio_net_set_config_size. 1698 */ 1699 n->config_size = sizeof(struct virtio_net_config); 1700 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 1701 "bootindex", "/ethernet-phy@0", 1702 DEVICE(n), NULL); 1703 } 1704 1705 static Property virtio_net_properties[] = { 1706 DEFINE_PROP_BIT("any_layout", VirtIONet, host_features, 1707 VIRTIO_F_ANY_LAYOUT, true), 1708 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), 1709 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, 1710 VIRTIO_NET_F_GUEST_CSUM, true), 1711 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 1712 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, 1713 VIRTIO_NET_F_GUEST_TSO4, true), 1714 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, 1715 VIRTIO_NET_F_GUEST_TSO6, true), 1716 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, 1717 VIRTIO_NET_F_GUEST_ECN, true), 1718 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, 1719 VIRTIO_NET_F_GUEST_UFO, true), 1720 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, 1721 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 1722 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, 1723 VIRTIO_NET_F_HOST_TSO4, true), 1724 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, 1725 VIRTIO_NET_F_HOST_TSO6, true), 1726 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, 1727 VIRTIO_NET_F_HOST_ECN, true), 1728 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, 1729 VIRTIO_NET_F_HOST_UFO, true), 1730 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, 1731 VIRTIO_NET_F_MRG_RXBUF, true), 1732 DEFINE_PROP_BIT("status", VirtIONet, host_features, 1733 VIRTIO_NET_F_STATUS, true), 1734 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, 1735 VIRTIO_NET_F_CTRL_VQ, true), 1736 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, 1737 VIRTIO_NET_F_CTRL_RX, true), 1738 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, 1739 VIRTIO_NET_F_CTRL_VLAN, true), 1740 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, 1741 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 1742 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, 1743 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 1744 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, 1745 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 1746 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 1747 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1748 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1749 TX_TIMER_INTERVAL), 1750 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1751 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1752 DEFINE_PROP_END_OF_LIST(), 1753 }; 1754 1755 static void virtio_net_class_init(ObjectClass *klass, void *data) 1756 { 1757 DeviceClass *dc = DEVICE_CLASS(klass); 1758 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1759 1760 dc->props = virtio_net_properties; 1761 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1762 vdc->realize = virtio_net_device_realize; 1763 vdc->unrealize = virtio_net_device_unrealize; 1764 vdc->get_config = virtio_net_get_config; 1765 vdc->set_config = virtio_net_set_config; 1766 vdc->get_features = virtio_net_get_features; 1767 vdc->set_features = virtio_net_set_features; 1768 vdc->bad_features = virtio_net_bad_features; 1769 vdc->reset = virtio_net_reset; 1770 vdc->set_status = virtio_net_set_status; 1771 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1772 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1773 vdc->load = virtio_net_load_device; 1774 vdc->save = virtio_net_save_device; 1775 } 1776 1777 static const TypeInfo virtio_net_info = { 1778 .name = TYPE_VIRTIO_NET, 1779 .parent = TYPE_VIRTIO_DEVICE, 1780 .instance_size = sizeof(VirtIONet), 1781 .instance_init = virtio_net_instance_init, 1782 .class_init = virtio_net_class_init, 1783 }; 1784 1785 static void virtio_register_types(void) 1786 { 1787 type_register_static(&virtio_net_info); 1788 } 1789 1790 type_init(virtio_register_types) 1791