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 return features; 470 } 471 return vhost_net_get_features(get_vhost_net(nc->peer), features); 472 } 473 474 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 475 { 476 uint64_t features = 0; 477 478 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 479 * but also these: */ 480 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 481 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 482 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 483 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 484 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 485 486 return features; 487 } 488 489 static void virtio_net_apply_guest_offloads(VirtIONet *n) 490 { 491 qemu_set_offload(qemu_get_queue(n->nic)->peer, 492 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 493 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 494 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 495 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 496 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 497 } 498 499 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 500 { 501 static const uint64_t guest_offloads_mask = 502 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 503 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 504 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 505 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 506 (1ULL << VIRTIO_NET_F_GUEST_UFO); 507 508 return guest_offloads_mask & features; 509 } 510 511 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 512 { 513 VirtIODevice *vdev = VIRTIO_DEVICE(n); 514 return virtio_net_guest_offloads_by_features(vdev->guest_features); 515 } 516 517 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 518 { 519 VirtIONet *n = VIRTIO_NET(vdev); 520 int i; 521 522 virtio_net_set_multiqueue(n, 523 __virtio_has_feature(features, VIRTIO_NET_F_MQ)); 524 525 virtio_net_set_mrg_rx_bufs(n, 526 __virtio_has_feature(features, 527 VIRTIO_NET_F_MRG_RXBUF), 528 __virtio_has_feature(features, 529 VIRTIO_F_VERSION_1)); 530 531 if (n->has_vnet_hdr) { 532 n->curr_guest_offloads = 533 virtio_net_guest_offloads_by_features(features); 534 virtio_net_apply_guest_offloads(n); 535 } 536 537 for (i = 0; i < n->max_queues; i++) { 538 NetClientState *nc = qemu_get_subqueue(n->nic, i); 539 540 if (!get_vhost_net(nc->peer)) { 541 continue; 542 } 543 vhost_net_ack_features(get_vhost_net(nc->peer), features); 544 } 545 546 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 547 memset(n->vlans, 0, MAX_VLAN >> 3); 548 } else { 549 memset(n->vlans, 0xff, MAX_VLAN >> 3); 550 } 551 } 552 553 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 554 struct iovec *iov, unsigned int iov_cnt) 555 { 556 uint8_t on; 557 size_t s; 558 NetClientState *nc = qemu_get_queue(n->nic); 559 560 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 561 if (s != sizeof(on)) { 562 return VIRTIO_NET_ERR; 563 } 564 565 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 566 n->promisc = on; 567 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 568 n->allmulti = on; 569 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 570 n->alluni = on; 571 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 572 n->nomulti = on; 573 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 574 n->nouni = on; 575 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 576 n->nobcast = on; 577 } else { 578 return VIRTIO_NET_ERR; 579 } 580 581 rxfilter_notify(nc); 582 583 return VIRTIO_NET_OK; 584 } 585 586 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 587 struct iovec *iov, unsigned int iov_cnt) 588 { 589 VirtIODevice *vdev = VIRTIO_DEVICE(n); 590 uint64_t offloads; 591 size_t s; 592 593 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 594 return VIRTIO_NET_ERR; 595 } 596 597 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 598 if (s != sizeof(offloads)) { 599 return VIRTIO_NET_ERR; 600 } 601 602 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 603 uint64_t supported_offloads; 604 605 if (!n->has_vnet_hdr) { 606 return VIRTIO_NET_ERR; 607 } 608 609 supported_offloads = virtio_net_supported_guest_offloads(n); 610 if (offloads & ~supported_offloads) { 611 return VIRTIO_NET_ERR; 612 } 613 614 n->curr_guest_offloads = offloads; 615 virtio_net_apply_guest_offloads(n); 616 617 return VIRTIO_NET_OK; 618 } else { 619 return VIRTIO_NET_ERR; 620 } 621 } 622 623 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 624 struct iovec *iov, unsigned int iov_cnt) 625 { 626 VirtIODevice *vdev = VIRTIO_DEVICE(n); 627 struct virtio_net_ctrl_mac mac_data; 628 size_t s; 629 NetClientState *nc = qemu_get_queue(n->nic); 630 631 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 632 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 633 return VIRTIO_NET_ERR; 634 } 635 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 636 assert(s == sizeof(n->mac)); 637 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 638 rxfilter_notify(nc); 639 640 return VIRTIO_NET_OK; 641 } 642 643 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 644 return VIRTIO_NET_ERR; 645 } 646 647 int in_use = 0; 648 int first_multi = 0; 649 uint8_t uni_overflow = 0; 650 uint8_t multi_overflow = 0; 651 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 652 653 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 654 sizeof(mac_data.entries)); 655 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 656 if (s != sizeof(mac_data.entries)) { 657 goto error; 658 } 659 iov_discard_front(&iov, &iov_cnt, s); 660 661 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 662 goto error; 663 } 664 665 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 666 s = iov_to_buf(iov, iov_cnt, 0, macs, 667 mac_data.entries * ETH_ALEN); 668 if (s != mac_data.entries * ETH_ALEN) { 669 goto error; 670 } 671 in_use += mac_data.entries; 672 } else { 673 uni_overflow = 1; 674 } 675 676 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 677 678 first_multi = in_use; 679 680 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 681 sizeof(mac_data.entries)); 682 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 683 if (s != sizeof(mac_data.entries)) { 684 goto error; 685 } 686 687 iov_discard_front(&iov, &iov_cnt, s); 688 689 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 690 goto error; 691 } 692 693 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 694 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 695 mac_data.entries * ETH_ALEN); 696 if (s != mac_data.entries * ETH_ALEN) { 697 goto error; 698 } 699 in_use += mac_data.entries; 700 } else { 701 multi_overflow = 1; 702 } 703 704 n->mac_table.in_use = in_use; 705 n->mac_table.first_multi = first_multi; 706 n->mac_table.uni_overflow = uni_overflow; 707 n->mac_table.multi_overflow = multi_overflow; 708 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 709 g_free(macs); 710 rxfilter_notify(nc); 711 712 return VIRTIO_NET_OK; 713 714 error: 715 g_free(macs); 716 return VIRTIO_NET_ERR; 717 } 718 719 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 720 struct iovec *iov, unsigned int iov_cnt) 721 { 722 VirtIODevice *vdev = VIRTIO_DEVICE(n); 723 uint16_t vid; 724 size_t s; 725 NetClientState *nc = qemu_get_queue(n->nic); 726 727 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 728 vid = virtio_lduw_p(vdev, &vid); 729 if (s != sizeof(vid)) { 730 return VIRTIO_NET_ERR; 731 } 732 733 if (vid >= MAX_VLAN) 734 return VIRTIO_NET_ERR; 735 736 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 737 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 738 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 739 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 740 else 741 return VIRTIO_NET_ERR; 742 743 rxfilter_notify(nc); 744 745 return VIRTIO_NET_OK; 746 } 747 748 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 749 struct iovec *iov, unsigned int iov_cnt) 750 { 751 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 752 n->status & VIRTIO_NET_S_ANNOUNCE) { 753 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 754 if (n->announce_counter) { 755 timer_mod(n->announce_timer, 756 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 757 self_announce_delay(n->announce_counter)); 758 } 759 return VIRTIO_NET_OK; 760 } else { 761 return VIRTIO_NET_ERR; 762 } 763 } 764 765 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 766 struct iovec *iov, unsigned int iov_cnt) 767 { 768 VirtIODevice *vdev = VIRTIO_DEVICE(n); 769 struct virtio_net_ctrl_mq mq; 770 size_t s; 771 uint16_t queues; 772 773 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 774 if (s != sizeof(mq)) { 775 return VIRTIO_NET_ERR; 776 } 777 778 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 779 return VIRTIO_NET_ERR; 780 } 781 782 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 783 784 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 785 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 786 queues > n->max_queues || 787 !n->multiqueue) { 788 return VIRTIO_NET_ERR; 789 } 790 791 n->curr_queues = queues; 792 /* stop the backend before changing the number of queues to avoid handling a 793 * disabled queue */ 794 virtio_net_set_status(vdev, vdev->status); 795 virtio_net_set_queues(n); 796 797 return VIRTIO_NET_OK; 798 } 799 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 800 { 801 VirtIONet *n = VIRTIO_NET(vdev); 802 struct virtio_net_ctrl_hdr ctrl; 803 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 804 VirtQueueElement elem; 805 size_t s; 806 struct iovec *iov, *iov2; 807 unsigned int iov_cnt; 808 809 while (virtqueue_pop(vq, &elem)) { 810 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 811 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 812 error_report("virtio-net ctrl missing headers"); 813 exit(1); 814 } 815 816 iov_cnt = elem.out_num; 817 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num); 818 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 819 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 820 if (s != sizeof(ctrl)) { 821 status = VIRTIO_NET_ERR; 822 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 823 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 824 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 825 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 826 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 827 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 828 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 829 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 830 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 831 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 832 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 833 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 834 } 835 836 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 837 assert(s == sizeof(status)); 838 839 virtqueue_push(vq, &elem, sizeof(status)); 840 virtio_notify(vdev, vq); 841 g_free(iov2); 842 } 843 } 844 845 /* RX */ 846 847 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 848 { 849 VirtIONet *n = VIRTIO_NET(vdev); 850 int queue_index = vq2q(virtio_get_queue_index(vq)); 851 852 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 853 } 854 855 static int virtio_net_can_receive(NetClientState *nc) 856 { 857 VirtIONet *n = qemu_get_nic_opaque(nc); 858 VirtIODevice *vdev = VIRTIO_DEVICE(n); 859 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 860 861 if (!vdev->vm_running) { 862 return 0; 863 } 864 865 if (nc->queue_index >= n->curr_queues) { 866 return 0; 867 } 868 869 if (!virtio_queue_ready(q->rx_vq) || 870 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 871 return 0; 872 } 873 874 return 1; 875 } 876 877 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 878 { 879 VirtIONet *n = q->n; 880 if (virtio_queue_empty(q->rx_vq) || 881 (n->mergeable_rx_bufs && 882 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 883 virtio_queue_set_notification(q->rx_vq, 1); 884 885 /* To avoid a race condition where the guest has made some buffers 886 * available after the above check but before notification was 887 * enabled, check for available buffers again. 888 */ 889 if (virtio_queue_empty(q->rx_vq) || 890 (n->mergeable_rx_bufs && 891 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 892 return 0; 893 } 894 } 895 896 virtio_queue_set_notification(q->rx_vq, 0); 897 return 1; 898 } 899 900 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 901 { 902 virtio_tswap16s(vdev, &hdr->hdr_len); 903 virtio_tswap16s(vdev, &hdr->gso_size); 904 virtio_tswap16s(vdev, &hdr->csum_start); 905 virtio_tswap16s(vdev, &hdr->csum_offset); 906 } 907 908 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 909 * it never finds out that the packets don't have valid checksums. This 910 * causes dhclient to get upset. Fedora's carried a patch for ages to 911 * fix this with Xen but it hasn't appeared in an upstream release of 912 * dhclient yet. 913 * 914 * To avoid breaking existing guests, we catch udp packets and add 915 * checksums. This is terrible but it's better than hacking the guest 916 * kernels. 917 * 918 * N.B. if we introduce a zero-copy API, this operation is no longer free so 919 * we should provide a mechanism to disable it to avoid polluting the host 920 * cache. 921 */ 922 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 923 uint8_t *buf, size_t size) 924 { 925 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 926 (size > 27 && size < 1500) && /* normal sized MTU */ 927 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 928 (buf[23] == 17) && /* ip.protocol == UDP */ 929 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 930 net_checksum_calculate(buf, size); 931 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 932 } 933 } 934 935 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 936 const void *buf, size_t size) 937 { 938 if (n->has_vnet_hdr) { 939 /* FIXME this cast is evil */ 940 void *wbuf = (void *)buf; 941 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 942 size - n->host_hdr_len); 943 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 944 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 945 } else { 946 struct virtio_net_hdr hdr = { 947 .flags = 0, 948 .gso_type = VIRTIO_NET_HDR_GSO_NONE 949 }; 950 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 951 } 952 } 953 954 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 955 { 956 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 957 static const uint8_t vlan[] = {0x81, 0x00}; 958 uint8_t *ptr = (uint8_t *)buf; 959 int i; 960 961 if (n->promisc) 962 return 1; 963 964 ptr += n->host_hdr_len; 965 966 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 967 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 968 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 969 return 0; 970 } 971 972 if (ptr[0] & 1) { // multicast 973 if (!memcmp(ptr, bcast, sizeof(bcast))) { 974 return !n->nobcast; 975 } else if (n->nomulti) { 976 return 0; 977 } else if (n->allmulti || n->mac_table.multi_overflow) { 978 return 1; 979 } 980 981 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 982 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 983 return 1; 984 } 985 } 986 } else { // unicast 987 if (n->nouni) { 988 return 0; 989 } else if (n->alluni || n->mac_table.uni_overflow) { 990 return 1; 991 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 992 return 1; 993 } 994 995 for (i = 0; i < n->mac_table.first_multi; i++) { 996 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 997 return 1; 998 } 999 } 1000 } 1001 1002 return 0; 1003 } 1004 1005 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 1006 { 1007 VirtIONet *n = qemu_get_nic_opaque(nc); 1008 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1009 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1010 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1011 struct virtio_net_hdr_mrg_rxbuf mhdr; 1012 unsigned mhdr_cnt = 0; 1013 size_t offset, i, guest_offset; 1014 1015 if (!virtio_net_can_receive(nc)) { 1016 return -1; 1017 } 1018 1019 /* hdr_len refers to the header we supply to the guest */ 1020 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1021 return 0; 1022 } 1023 1024 if (!receive_filter(n, buf, size)) 1025 return size; 1026 1027 offset = i = 0; 1028 1029 while (offset < size) { 1030 VirtQueueElement elem; 1031 int len, total; 1032 const struct iovec *sg = elem.in_sg; 1033 1034 total = 0; 1035 1036 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1037 if (i == 0) 1038 return -1; 1039 error_report("virtio-net unexpected empty queue: " 1040 "i %zd mergeable %d offset %zd, size %zd, " 1041 "guest hdr len %zd, host hdr len %zd " 1042 "guest features 0x%" PRIx64, 1043 i, n->mergeable_rx_bufs, offset, size, 1044 n->guest_hdr_len, n->host_hdr_len, 1045 vdev->guest_features); 1046 exit(1); 1047 } 1048 1049 if (elem.in_num < 1) { 1050 error_report("virtio-net receive queue contains no in buffers"); 1051 exit(1); 1052 } 1053 1054 if (i == 0) { 1055 assert(offset == 0); 1056 if (n->mergeable_rx_bufs) { 1057 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1058 sg, elem.in_num, 1059 offsetof(typeof(mhdr), num_buffers), 1060 sizeof(mhdr.num_buffers)); 1061 } 1062 1063 receive_header(n, sg, elem.in_num, buf, size); 1064 offset = n->host_hdr_len; 1065 total += n->guest_hdr_len; 1066 guest_offset = n->guest_hdr_len; 1067 } else { 1068 guest_offset = 0; 1069 } 1070 1071 /* copy in packet. ugh */ 1072 len = iov_from_buf(sg, elem.in_num, guest_offset, 1073 buf + offset, size - offset); 1074 total += len; 1075 offset += len; 1076 /* If buffers can't be merged, at this point we 1077 * must have consumed the complete packet. 1078 * Otherwise, drop it. */ 1079 if (!n->mergeable_rx_bufs && offset < size) { 1080 #if 0 1081 error_report("virtio-net truncated non-mergeable packet: " 1082 "i %zd mergeable %d offset %zd, size %zd, " 1083 "guest hdr len %zd, host hdr len %zd", 1084 i, n->mergeable_rx_bufs, 1085 offset, size, n->guest_hdr_len, n->host_hdr_len); 1086 #endif 1087 return size; 1088 } 1089 1090 /* signal other side */ 1091 virtqueue_fill(q->rx_vq, &elem, total, i++); 1092 } 1093 1094 if (mhdr_cnt) { 1095 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1096 iov_from_buf(mhdr_sg, mhdr_cnt, 1097 0, 1098 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1099 } 1100 1101 virtqueue_flush(q->rx_vq, i); 1102 virtio_notify(vdev, q->rx_vq); 1103 1104 return size; 1105 } 1106 1107 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1108 1109 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1110 { 1111 VirtIONet *n = qemu_get_nic_opaque(nc); 1112 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1113 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1114 1115 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1116 virtio_notify(vdev, q->tx_vq); 1117 1118 q->async_tx.elem.out_num = q->async_tx.len = 0; 1119 1120 virtio_queue_set_notification(q->tx_vq, 1); 1121 virtio_net_flush_tx(q); 1122 } 1123 1124 /* TX */ 1125 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1126 { 1127 VirtIONet *n = q->n; 1128 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1129 VirtQueueElement elem; 1130 int32_t num_packets = 0; 1131 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1132 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1133 return num_packets; 1134 } 1135 1136 if (q->async_tx.elem.out_num) { 1137 virtio_queue_set_notification(q->tx_vq, 0); 1138 return num_packets; 1139 } 1140 1141 while (virtqueue_pop(q->tx_vq, &elem)) { 1142 ssize_t ret, len; 1143 unsigned int out_num = elem.out_num; 1144 struct iovec *out_sg = &elem.out_sg[0]; 1145 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1146 1147 if (out_num < 1) { 1148 error_report("virtio-net header not in first element"); 1149 exit(1); 1150 } 1151 1152 if (n->has_vnet_hdr) { 1153 if (out_sg[0].iov_len < n->guest_hdr_len) { 1154 error_report("virtio-net header incorrect"); 1155 exit(1); 1156 } 1157 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); 1158 } 1159 1160 /* 1161 * If host wants to see the guest header as is, we can 1162 * pass it on unchanged. Otherwise, copy just the parts 1163 * that host is interested in. 1164 */ 1165 assert(n->host_hdr_len <= n->guest_hdr_len); 1166 if (n->host_hdr_len != n->guest_hdr_len) { 1167 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1168 out_sg, out_num, 1169 0, n->host_hdr_len); 1170 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1171 out_sg, out_num, 1172 n->guest_hdr_len, -1); 1173 out_num = sg_num; 1174 out_sg = sg; 1175 } 1176 1177 len = n->guest_hdr_len; 1178 1179 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1180 out_sg, out_num, virtio_net_tx_complete); 1181 if (ret == 0) { 1182 virtio_queue_set_notification(q->tx_vq, 0); 1183 q->async_tx.elem = elem; 1184 q->async_tx.len = len; 1185 return -EBUSY; 1186 } 1187 1188 len += ret; 1189 1190 virtqueue_push(q->tx_vq, &elem, 0); 1191 virtio_notify(vdev, q->tx_vq); 1192 1193 if (++num_packets >= n->tx_burst) { 1194 break; 1195 } 1196 } 1197 return num_packets; 1198 } 1199 1200 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1201 { 1202 VirtIONet *n = VIRTIO_NET(vdev); 1203 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1204 1205 /* This happens when device was stopped but VCPU wasn't. */ 1206 if (!vdev->vm_running) { 1207 q->tx_waiting = 1; 1208 return; 1209 } 1210 1211 if (q->tx_waiting) { 1212 virtio_queue_set_notification(vq, 1); 1213 timer_del(q->tx_timer); 1214 q->tx_waiting = 0; 1215 virtio_net_flush_tx(q); 1216 } else { 1217 timer_mod(q->tx_timer, 1218 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1219 q->tx_waiting = 1; 1220 virtio_queue_set_notification(vq, 0); 1221 } 1222 } 1223 1224 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1225 { 1226 VirtIONet *n = VIRTIO_NET(vdev); 1227 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1228 1229 if (unlikely(q->tx_waiting)) { 1230 return; 1231 } 1232 q->tx_waiting = 1; 1233 /* This happens when device was stopped but VCPU wasn't. */ 1234 if (!vdev->vm_running) { 1235 return; 1236 } 1237 virtio_queue_set_notification(vq, 0); 1238 qemu_bh_schedule(q->tx_bh); 1239 } 1240 1241 static void virtio_net_tx_timer(void *opaque) 1242 { 1243 VirtIONetQueue *q = opaque; 1244 VirtIONet *n = q->n; 1245 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1246 /* This happens when device was stopped but BH wasn't. */ 1247 if (!vdev->vm_running) { 1248 /* Make sure tx waiting is set, so we'll run when restarted. */ 1249 assert(q->tx_waiting); 1250 return; 1251 } 1252 1253 q->tx_waiting = 0; 1254 1255 /* Just in case the driver is not ready on more */ 1256 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1257 return; 1258 } 1259 1260 virtio_queue_set_notification(q->tx_vq, 1); 1261 virtio_net_flush_tx(q); 1262 } 1263 1264 static void virtio_net_tx_bh(void *opaque) 1265 { 1266 VirtIONetQueue *q = opaque; 1267 VirtIONet *n = q->n; 1268 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1269 int32_t ret; 1270 1271 /* This happens when device was stopped but BH wasn't. */ 1272 if (!vdev->vm_running) { 1273 /* Make sure tx waiting is set, so we'll run when restarted. */ 1274 assert(q->tx_waiting); 1275 return; 1276 } 1277 1278 q->tx_waiting = 0; 1279 1280 /* Just in case the driver is not ready on more */ 1281 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1282 return; 1283 } 1284 1285 ret = virtio_net_flush_tx(q); 1286 if (ret == -EBUSY) { 1287 return; /* Notification re-enable handled by tx_complete */ 1288 } 1289 1290 /* If we flush a full burst of packets, assume there are 1291 * more coming and immediately reschedule */ 1292 if (ret >= n->tx_burst) { 1293 qemu_bh_schedule(q->tx_bh); 1294 q->tx_waiting = 1; 1295 return; 1296 } 1297 1298 /* If less than a full burst, re-enable notification and flush 1299 * anything that may have come in while we weren't looking. If 1300 * we find something, assume the guest is still active and reschedule */ 1301 virtio_queue_set_notification(q->tx_vq, 1); 1302 if (virtio_net_flush_tx(q) > 0) { 1303 virtio_queue_set_notification(q->tx_vq, 0); 1304 qemu_bh_schedule(q->tx_bh); 1305 q->tx_waiting = 1; 1306 } 1307 } 1308 1309 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1310 { 1311 n->multiqueue = multiqueue; 1312 1313 virtio_net_set_queues(n); 1314 } 1315 1316 static void virtio_net_save(QEMUFile *f, void *opaque) 1317 { 1318 VirtIONet *n = opaque; 1319 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1320 1321 /* At this point, backend must be stopped, otherwise 1322 * it might keep writing to memory. */ 1323 assert(!n->vhost_started); 1324 virtio_save(vdev, f); 1325 } 1326 1327 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1328 { 1329 VirtIONet *n = VIRTIO_NET(vdev); 1330 int i; 1331 1332 qemu_put_buffer(f, n->mac, ETH_ALEN); 1333 qemu_put_be32(f, n->vqs[0].tx_waiting); 1334 qemu_put_be32(f, n->mergeable_rx_bufs); 1335 qemu_put_be16(f, n->status); 1336 qemu_put_byte(f, n->promisc); 1337 qemu_put_byte(f, n->allmulti); 1338 qemu_put_be32(f, n->mac_table.in_use); 1339 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1340 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1341 qemu_put_be32(f, n->has_vnet_hdr); 1342 qemu_put_byte(f, n->mac_table.multi_overflow); 1343 qemu_put_byte(f, n->mac_table.uni_overflow); 1344 qemu_put_byte(f, n->alluni); 1345 qemu_put_byte(f, n->nomulti); 1346 qemu_put_byte(f, n->nouni); 1347 qemu_put_byte(f, n->nobcast); 1348 qemu_put_byte(f, n->has_ufo); 1349 if (n->max_queues > 1) { 1350 qemu_put_be16(f, n->max_queues); 1351 qemu_put_be16(f, n->curr_queues); 1352 for (i = 1; i < n->curr_queues; i++) { 1353 qemu_put_be32(f, n->vqs[i].tx_waiting); 1354 } 1355 } 1356 1357 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1358 qemu_put_be64(f, n->curr_guest_offloads); 1359 } 1360 } 1361 1362 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1363 { 1364 VirtIONet *n = opaque; 1365 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1366 1367 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1368 return -EINVAL; 1369 1370 return virtio_load(vdev, f, version_id); 1371 } 1372 1373 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1374 int version_id) 1375 { 1376 VirtIONet *n = VIRTIO_NET(vdev); 1377 int i, link_down; 1378 1379 qemu_get_buffer(f, n->mac, ETH_ALEN); 1380 n->vqs[0].tx_waiting = qemu_get_be32(f); 1381 1382 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f), 1383 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)); 1384 1385 if (version_id >= 3) 1386 n->status = qemu_get_be16(f); 1387 1388 if (version_id >= 4) { 1389 if (version_id < 8) { 1390 n->promisc = qemu_get_be32(f); 1391 n->allmulti = qemu_get_be32(f); 1392 } else { 1393 n->promisc = qemu_get_byte(f); 1394 n->allmulti = qemu_get_byte(f); 1395 } 1396 } 1397 1398 if (version_id >= 5) { 1399 n->mac_table.in_use = qemu_get_be32(f); 1400 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1401 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1402 qemu_get_buffer(f, n->mac_table.macs, 1403 n->mac_table.in_use * ETH_ALEN); 1404 } else { 1405 int64_t i; 1406 1407 /* Overflow detected - can happen if source has a larger MAC table. 1408 * We simply set overflow flag so there's no need to maintain the 1409 * table of addresses, discard them all. 1410 * Note: 64 bit math to avoid integer overflow. 1411 */ 1412 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1413 qemu_get_byte(f); 1414 } 1415 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1416 n->mac_table.in_use = 0; 1417 } 1418 } 1419 1420 if (version_id >= 6) 1421 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1422 1423 if (version_id >= 7) { 1424 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1425 error_report("virtio-net: saved image requires vnet_hdr=on"); 1426 return -1; 1427 } 1428 } 1429 1430 if (version_id >= 9) { 1431 n->mac_table.multi_overflow = qemu_get_byte(f); 1432 n->mac_table.uni_overflow = qemu_get_byte(f); 1433 } 1434 1435 if (version_id >= 10) { 1436 n->alluni = qemu_get_byte(f); 1437 n->nomulti = qemu_get_byte(f); 1438 n->nouni = qemu_get_byte(f); 1439 n->nobcast = qemu_get_byte(f); 1440 } 1441 1442 if (version_id >= 11) { 1443 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1444 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1445 return -1; 1446 } 1447 } 1448 1449 if (n->max_queues > 1) { 1450 if (n->max_queues != qemu_get_be16(f)) { 1451 error_report("virtio-net: different max_queues "); 1452 return -1; 1453 } 1454 1455 n->curr_queues = qemu_get_be16(f); 1456 if (n->curr_queues > n->max_queues) { 1457 error_report("virtio-net: curr_queues %x > max_queues %x", 1458 n->curr_queues, n->max_queues); 1459 return -1; 1460 } 1461 for (i = 1; i < n->curr_queues; i++) { 1462 n->vqs[i].tx_waiting = qemu_get_be32(f); 1463 } 1464 } 1465 1466 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1467 n->curr_guest_offloads = qemu_get_be64(f); 1468 } else { 1469 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1470 } 1471 1472 if (peer_has_vnet_hdr(n)) { 1473 virtio_net_apply_guest_offloads(n); 1474 } 1475 1476 virtio_net_set_queues(n); 1477 1478 /* Find the first multicast entry in the saved MAC filter */ 1479 for (i = 0; i < n->mac_table.in_use; i++) { 1480 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1481 break; 1482 } 1483 } 1484 n->mac_table.first_multi = i; 1485 1486 /* nc.link_down can't be migrated, so infer link_down according 1487 * to link status bit in n->status */ 1488 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1489 for (i = 0; i < n->max_queues; i++) { 1490 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1491 } 1492 1493 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1494 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1495 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1496 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1497 } 1498 1499 return 0; 1500 } 1501 1502 static NetClientInfo net_virtio_info = { 1503 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1504 .size = sizeof(NICState), 1505 .can_receive = virtio_net_can_receive, 1506 .receive = virtio_net_receive, 1507 .link_status_changed = virtio_net_set_link_status, 1508 .query_rx_filter = virtio_net_query_rxfilter, 1509 }; 1510 1511 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1512 { 1513 VirtIONet *n = VIRTIO_NET(vdev); 1514 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1515 assert(n->vhost_started); 1516 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1517 } 1518 1519 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1520 bool mask) 1521 { 1522 VirtIONet *n = VIRTIO_NET(vdev); 1523 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1524 assert(n->vhost_started); 1525 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1526 vdev, idx, mask); 1527 } 1528 1529 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 1530 { 1531 int i, config_size = 0; 1532 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1533 for (i = 0; feature_sizes[i].flags != 0; i++) { 1534 if (host_features & feature_sizes[i].flags) { 1535 config_size = MAX(feature_sizes[i].end, config_size); 1536 } 1537 } 1538 n->config_size = config_size; 1539 } 1540 1541 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1542 const char *type) 1543 { 1544 /* 1545 * The name can be NULL, the netclient name will be type.x. 1546 */ 1547 assert(type != NULL); 1548 1549 g_free(n->netclient_name); 1550 g_free(n->netclient_type); 1551 n->netclient_name = g_strdup(name); 1552 n->netclient_type = g_strdup(type); 1553 } 1554 1555 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1556 { 1557 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1558 VirtIONet *n = VIRTIO_NET(dev); 1559 NetClientState *nc; 1560 int i; 1561 1562 virtio_net_set_config_size(n, n->host_features); 1563 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1564 1565 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1566 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { 1567 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1568 "must be a positive integer less than %d.", 1569 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); 1570 virtio_cleanup(vdev); 1571 return; 1572 } 1573 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1574 n->curr_queues = 1; 1575 n->tx_timeout = n->net_conf.txtimer; 1576 1577 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1578 && strcmp(n->net_conf.tx, "bh")) { 1579 error_report("virtio-net: " 1580 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1581 n->net_conf.tx); 1582 error_report("Defaulting to \"bh\""); 1583 } 1584 1585 for (i = 0; i < n->max_queues; i++) { 1586 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1587 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1588 n->vqs[i].tx_vq = 1589 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1590 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1591 virtio_net_tx_timer, 1592 &n->vqs[i]); 1593 } else { 1594 n->vqs[i].tx_vq = 1595 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1596 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1597 } 1598 1599 n->vqs[i].tx_waiting = 0; 1600 n->vqs[i].n = n; 1601 } 1602 1603 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1604 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1605 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1606 n->status = VIRTIO_NET_S_LINK_UP; 1607 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1608 virtio_net_announce_timer, n); 1609 1610 if (n->netclient_type) { 1611 /* 1612 * Happen when virtio_net_set_netclient_name has been called. 1613 */ 1614 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1615 n->netclient_type, n->netclient_name, n); 1616 } else { 1617 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1618 object_get_typename(OBJECT(dev)), dev->id, n); 1619 } 1620 1621 peer_test_vnet_hdr(n); 1622 if (peer_has_vnet_hdr(n)) { 1623 for (i = 0; i < n->max_queues; i++) { 1624 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1625 } 1626 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1627 } else { 1628 n->host_hdr_len = 0; 1629 } 1630 1631 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1632 1633 n->vqs[0].tx_waiting = 0; 1634 n->tx_burst = n->net_conf.txburst; 1635 virtio_net_set_mrg_rx_bufs(n, 0, 0); 1636 n->promisc = 1; /* for compatibility */ 1637 1638 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1639 1640 n->vlans = g_malloc0(MAX_VLAN >> 3); 1641 1642 nc = qemu_get_queue(n->nic); 1643 nc->rxfilter_notify_enabled = 1; 1644 1645 n->qdev = dev; 1646 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1647 virtio_net_save, virtio_net_load, n); 1648 } 1649 1650 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1651 { 1652 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1653 VirtIONet *n = VIRTIO_NET(dev); 1654 int i; 1655 1656 /* This will stop vhost backend if appropriate. */ 1657 virtio_net_set_status(vdev, 0); 1658 1659 unregister_savevm(dev, "virtio-net", n); 1660 1661 g_free(n->netclient_name); 1662 n->netclient_name = NULL; 1663 g_free(n->netclient_type); 1664 n->netclient_type = NULL; 1665 1666 g_free(n->mac_table.macs); 1667 g_free(n->vlans); 1668 1669 for (i = 0; i < n->max_queues; i++) { 1670 VirtIONetQueue *q = &n->vqs[i]; 1671 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1672 1673 qemu_purge_queued_packets(nc); 1674 1675 if (q->tx_timer) { 1676 timer_del(q->tx_timer); 1677 timer_free(q->tx_timer); 1678 } else if (q->tx_bh) { 1679 qemu_bh_delete(q->tx_bh); 1680 } 1681 } 1682 1683 timer_del(n->announce_timer); 1684 timer_free(n->announce_timer); 1685 g_free(n->vqs); 1686 qemu_del_nic(n->nic); 1687 virtio_cleanup(vdev); 1688 } 1689 1690 static void virtio_net_instance_init(Object *obj) 1691 { 1692 VirtIONet *n = VIRTIO_NET(obj); 1693 1694 /* 1695 * The default config_size is sizeof(struct virtio_net_config). 1696 * Can be overriden with virtio_net_set_config_size. 1697 */ 1698 n->config_size = sizeof(struct virtio_net_config); 1699 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 1700 "bootindex", "/ethernet-phy@0", 1701 DEVICE(n), NULL); 1702 } 1703 1704 static Property virtio_net_properties[] = { 1705 DEFINE_PROP_BIT("any_layout", VirtIONet, host_features, 1706 VIRTIO_F_ANY_LAYOUT, true), 1707 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), 1708 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, 1709 VIRTIO_NET_F_GUEST_CSUM, true), 1710 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 1711 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, 1712 VIRTIO_NET_F_GUEST_TSO4, true), 1713 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, 1714 VIRTIO_NET_F_GUEST_TSO6, true), 1715 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, 1716 VIRTIO_NET_F_GUEST_ECN, true), 1717 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, 1718 VIRTIO_NET_F_GUEST_UFO, true), 1719 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, 1720 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 1721 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, 1722 VIRTIO_NET_F_HOST_TSO4, true), 1723 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, 1724 VIRTIO_NET_F_HOST_TSO6, true), 1725 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, 1726 VIRTIO_NET_F_HOST_ECN, true), 1727 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, 1728 VIRTIO_NET_F_HOST_UFO, true), 1729 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, 1730 VIRTIO_NET_F_MRG_RXBUF, true), 1731 DEFINE_PROP_BIT("status", VirtIONet, host_features, 1732 VIRTIO_NET_F_STATUS, true), 1733 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, 1734 VIRTIO_NET_F_CTRL_VQ, true), 1735 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, 1736 VIRTIO_NET_F_CTRL_RX, true), 1737 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, 1738 VIRTIO_NET_F_CTRL_VLAN, true), 1739 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, 1740 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 1741 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, 1742 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 1743 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, 1744 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 1745 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 1746 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1747 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1748 TX_TIMER_INTERVAL), 1749 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1750 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1751 DEFINE_PROP_END_OF_LIST(), 1752 }; 1753 1754 static void virtio_net_class_init(ObjectClass *klass, void *data) 1755 { 1756 DeviceClass *dc = DEVICE_CLASS(klass); 1757 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1758 1759 dc->props = virtio_net_properties; 1760 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1761 vdc->realize = virtio_net_device_realize; 1762 vdc->unrealize = virtio_net_device_unrealize; 1763 vdc->get_config = virtio_net_get_config; 1764 vdc->set_config = virtio_net_set_config; 1765 vdc->get_features = virtio_net_get_features; 1766 vdc->set_features = virtio_net_set_features; 1767 vdc->bad_features = virtio_net_bad_features; 1768 vdc->reset = virtio_net_reset; 1769 vdc->set_status = virtio_net_set_status; 1770 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1771 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1772 vdc->load = virtio_net_load_device; 1773 vdc->save = virtio_net_save_device; 1774 } 1775 1776 static const TypeInfo virtio_net_info = { 1777 .name = TYPE_VIRTIO_NET, 1778 .parent = TYPE_VIRTIO_DEVICE, 1779 .instance_size = sizeof(VirtIONet), 1780 .instance_init = virtio_net_instance_init, 1781 .class_init = virtio_net_class_init, 1782 }; 1783 1784 static void virtio_register_types(void) 1785 { 1786 type_register_static(&virtio_net_info); 1787 } 1788 1789 type_init(virtio_register_types) 1790