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 "monitor/monitor.h" 26 27 #define VIRTIO_NET_VM_VERSION 11 28 29 #define MAC_TABLE_ENTRIES 64 30 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 31 32 /* 33 * Calculate the number of bytes up to and including the given 'field' of 34 * 'container'. 35 */ 36 #define endof(container, field) \ 37 (offsetof(container, field) + sizeof(((container *)0)->field)) 38 39 typedef struct VirtIOFeature { 40 uint32_t flags; 41 size_t end; 42 } VirtIOFeature; 43 44 static VirtIOFeature feature_sizes[] = { 45 {.flags = 1 << VIRTIO_NET_F_MAC, 46 .end = endof(struct virtio_net_config, mac)}, 47 {.flags = 1 << VIRTIO_NET_F_STATUS, 48 .end = endof(struct virtio_net_config, status)}, 49 {.flags = 1 << VIRTIO_NET_F_MQ, 50 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 51 {} 52 }; 53 54 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 55 { 56 VirtIONet *n = qemu_get_nic_opaque(nc); 57 58 return &n->vqs[nc->queue_index]; 59 } 60 61 static int vq2q(int queue_index) 62 { 63 return queue_index / 2; 64 } 65 66 /* TODO 67 * - we could suppress RX interrupt if we were so inclined. 68 */ 69 70 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 71 { 72 VirtIONet *n = VIRTIO_NET(vdev); 73 struct virtio_net_config netcfg; 74 75 stw_p(&netcfg.status, n->status); 76 stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); 77 memcpy(netcfg.mac, n->mac, ETH_ALEN); 78 memcpy(config, &netcfg, n->config_size); 79 } 80 81 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 82 { 83 VirtIONet *n = VIRTIO_NET(vdev); 84 struct virtio_net_config netcfg = {}; 85 86 memcpy(&netcfg, config, n->config_size); 87 88 if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && 89 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 90 memcpy(n->mac, netcfg.mac, ETH_ALEN); 91 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 92 } 93 } 94 95 static bool virtio_net_started(VirtIONet *n, uint8_t status) 96 { 97 VirtIODevice *vdev = VIRTIO_DEVICE(n); 98 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 99 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 100 } 101 102 static void virtio_net_announce_timer(void *opaque) 103 { 104 VirtIONet *n = opaque; 105 VirtIODevice *vdev = VIRTIO_DEVICE(n); 106 107 n->announce_counter--; 108 n->status |= VIRTIO_NET_S_ANNOUNCE; 109 virtio_notify_config(vdev); 110 } 111 112 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 113 { 114 VirtIODevice *vdev = VIRTIO_DEVICE(n); 115 NetClientState *nc = qemu_get_queue(n->nic); 116 int queues = n->multiqueue ? n->max_queues : 1; 117 118 if (!get_vhost_net(nc->peer)) { 119 return; 120 } 121 122 if (!!n->vhost_started == 123 (virtio_net_started(n, status) && !nc->peer->link_down)) { 124 return; 125 } 126 if (!n->vhost_started) { 127 int r; 128 if (!vhost_net_query(get_vhost_net(nc->peer), vdev)) { 129 return; 130 } 131 n->vhost_started = 1; 132 r = vhost_net_start(vdev, n->nic->ncs, queues); 133 if (r < 0) { 134 error_report("unable to start vhost net: %d: " 135 "falling back on userspace virtio", -r); 136 n->vhost_started = 0; 137 } 138 } else { 139 vhost_net_stop(vdev, n->nic->ncs, queues); 140 n->vhost_started = 0; 141 } 142 } 143 144 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 145 { 146 VirtIONet *n = VIRTIO_NET(vdev); 147 VirtIONetQueue *q; 148 int i; 149 uint8_t queue_status; 150 151 virtio_net_vhost_status(n, status); 152 153 for (i = 0; i < n->max_queues; i++) { 154 q = &n->vqs[i]; 155 156 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 157 queue_status = 0; 158 } else { 159 queue_status = status; 160 } 161 162 if (!q->tx_waiting) { 163 continue; 164 } 165 166 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 167 if (q->tx_timer) { 168 timer_mod(q->tx_timer, 169 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 170 } else { 171 qemu_bh_schedule(q->tx_bh); 172 } 173 } else { 174 if (q->tx_timer) { 175 timer_del(q->tx_timer); 176 } else { 177 qemu_bh_cancel(q->tx_bh); 178 } 179 } 180 } 181 } 182 183 static void virtio_net_set_link_status(NetClientState *nc) 184 { 185 VirtIONet *n = qemu_get_nic_opaque(nc); 186 VirtIODevice *vdev = VIRTIO_DEVICE(n); 187 uint16_t old_status = n->status; 188 189 if (nc->link_down) 190 n->status &= ~VIRTIO_NET_S_LINK_UP; 191 else 192 n->status |= VIRTIO_NET_S_LINK_UP; 193 194 if (n->status != old_status) 195 virtio_notify_config(vdev); 196 197 virtio_net_set_status(vdev, vdev->status); 198 } 199 200 static void rxfilter_notify(NetClientState *nc) 201 { 202 QObject *event_data; 203 VirtIONet *n = qemu_get_nic_opaque(nc); 204 205 if (nc->rxfilter_notify_enabled) { 206 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 207 if (n->netclient_name) { 208 event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }", 209 n->netclient_name, path); 210 } else { 211 event_data = qobject_from_jsonf("{ 'path': %s }", path); 212 } 213 monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data); 214 qobject_decref(event_data); 215 g_free(path); 216 217 /* disable event notification to avoid events flooding */ 218 nc->rxfilter_notify_enabled = 0; 219 } 220 } 221 222 static char *mac_strdup_printf(const uint8_t *mac) 223 { 224 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0], 225 mac[1], mac[2], mac[3], mac[4], mac[5]); 226 } 227 228 static intList *get_vlan_table(VirtIONet *n) 229 { 230 intList *list, *entry; 231 int i, j; 232 233 list = NULL; 234 for (i = 0; i < MAX_VLAN >> 5; i++) { 235 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 236 if (n->vlans[i] & (1U << j)) { 237 entry = g_malloc0(sizeof(*entry)); 238 entry->value = (i << 5) + j; 239 entry->next = list; 240 list = entry; 241 } 242 } 243 } 244 245 return list; 246 } 247 248 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 249 { 250 VirtIONet *n = qemu_get_nic_opaque(nc); 251 VirtIODevice *vdev = VIRTIO_DEVICE(n); 252 RxFilterInfo *info; 253 strList *str_list, *entry; 254 int i; 255 256 info = g_malloc0(sizeof(*info)); 257 info->name = g_strdup(nc->name); 258 info->promiscuous = n->promisc; 259 260 if (n->nouni) { 261 info->unicast = RX_STATE_NONE; 262 } else if (n->alluni) { 263 info->unicast = RX_STATE_ALL; 264 } else { 265 info->unicast = RX_STATE_NORMAL; 266 } 267 268 if (n->nomulti) { 269 info->multicast = RX_STATE_NONE; 270 } else if (n->allmulti) { 271 info->multicast = RX_STATE_ALL; 272 } else { 273 info->multicast = RX_STATE_NORMAL; 274 } 275 276 info->broadcast_allowed = n->nobcast; 277 info->multicast_overflow = n->mac_table.multi_overflow; 278 info->unicast_overflow = n->mac_table.uni_overflow; 279 280 info->main_mac = mac_strdup_printf(n->mac); 281 282 str_list = NULL; 283 for (i = 0; i < n->mac_table.first_multi; i++) { 284 entry = g_malloc0(sizeof(*entry)); 285 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 286 entry->next = str_list; 287 str_list = entry; 288 } 289 info->unicast_table = str_list; 290 291 str_list = NULL; 292 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 293 entry = g_malloc0(sizeof(*entry)); 294 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 295 entry->next = str_list; 296 str_list = entry; 297 } 298 info->multicast_table = str_list; 299 info->vlan_table = get_vlan_table(n); 300 301 if (!((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features)) { 302 info->vlan = RX_STATE_ALL; 303 } else if (!info->vlan_table) { 304 info->vlan = RX_STATE_NONE; 305 } else { 306 info->vlan = RX_STATE_NORMAL; 307 } 308 309 /* enable event notification after query */ 310 nc->rxfilter_notify_enabled = 1; 311 312 return info; 313 } 314 315 static void virtio_net_reset(VirtIODevice *vdev) 316 { 317 VirtIONet *n = VIRTIO_NET(vdev); 318 319 /* Reset back to compatibility mode */ 320 n->promisc = 1; 321 n->allmulti = 0; 322 n->alluni = 0; 323 n->nomulti = 0; 324 n->nouni = 0; 325 n->nobcast = 0; 326 /* multiqueue is disabled by default */ 327 n->curr_queues = 1; 328 timer_del(n->announce_timer); 329 n->announce_counter = 0; 330 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 331 332 /* Flush any MAC and VLAN filter table state */ 333 n->mac_table.in_use = 0; 334 n->mac_table.first_multi = 0; 335 n->mac_table.multi_overflow = 0; 336 n->mac_table.uni_overflow = 0; 337 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 338 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 339 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 340 memset(n->vlans, 0, MAX_VLAN >> 3); 341 } 342 343 static void peer_test_vnet_hdr(VirtIONet *n) 344 { 345 NetClientState *nc = qemu_get_queue(n->nic); 346 if (!nc->peer) { 347 return; 348 } 349 350 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 351 } 352 353 static int peer_has_vnet_hdr(VirtIONet *n) 354 { 355 return n->has_vnet_hdr; 356 } 357 358 static int peer_has_ufo(VirtIONet *n) 359 { 360 if (!peer_has_vnet_hdr(n)) 361 return 0; 362 363 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 364 365 return n->has_ufo; 366 } 367 368 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 369 { 370 int i; 371 NetClientState *nc; 372 373 n->mergeable_rx_bufs = mergeable_rx_bufs; 374 375 n->guest_hdr_len = n->mergeable_rx_bufs ? 376 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 377 378 for (i = 0; i < n->max_queues; i++) { 379 nc = qemu_get_subqueue(n->nic, i); 380 381 if (peer_has_vnet_hdr(n) && 382 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 383 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 384 n->host_hdr_len = n->guest_hdr_len; 385 } 386 } 387 } 388 389 static int peer_attach(VirtIONet *n, int index) 390 { 391 NetClientState *nc = qemu_get_subqueue(n->nic, index); 392 393 if (!nc->peer) { 394 return 0; 395 } 396 397 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 398 return 0; 399 } 400 401 return tap_enable(nc->peer); 402 } 403 404 static int peer_detach(VirtIONet *n, int index) 405 { 406 NetClientState *nc = qemu_get_subqueue(n->nic, index); 407 408 if (!nc->peer) { 409 return 0; 410 } 411 412 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 413 return 0; 414 } 415 416 return tap_disable(nc->peer); 417 } 418 419 static void virtio_net_set_queues(VirtIONet *n) 420 { 421 int i; 422 int r; 423 424 for (i = 0; i < n->max_queues; i++) { 425 if (i < n->curr_queues) { 426 r = peer_attach(n, i); 427 assert(!r); 428 } else { 429 r = peer_detach(n, i); 430 assert(!r); 431 } 432 } 433 } 434 435 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 436 437 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 438 { 439 VirtIONet *n = VIRTIO_NET(vdev); 440 NetClientState *nc = qemu_get_queue(n->nic); 441 442 features |= (1 << VIRTIO_NET_F_MAC); 443 444 if (!peer_has_vnet_hdr(n)) { 445 features &= ~(0x1 << VIRTIO_NET_F_CSUM); 446 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); 447 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); 448 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); 449 450 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); 451 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); 452 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); 453 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); 454 } 455 456 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 457 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); 458 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); 459 } 460 461 if (!get_vhost_net(nc->peer)) { 462 return features; 463 } 464 return vhost_net_get_features(get_vhost_net(nc->peer), features); 465 } 466 467 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 468 { 469 uint32_t features = 0; 470 471 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 472 * but also these: */ 473 features |= (1 << VIRTIO_NET_F_MAC); 474 features |= (1 << VIRTIO_NET_F_CSUM); 475 features |= (1 << VIRTIO_NET_F_HOST_TSO4); 476 features |= (1 << VIRTIO_NET_F_HOST_TSO6); 477 features |= (1 << VIRTIO_NET_F_HOST_ECN); 478 479 return features; 480 } 481 482 static void virtio_net_apply_guest_offloads(VirtIONet *n) 483 { 484 qemu_set_offload(qemu_get_queue(n->nic)->peer, 485 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 486 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 487 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 488 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 489 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 490 } 491 492 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 493 { 494 static const uint64_t guest_offloads_mask = 495 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 496 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 497 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 498 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 499 (1ULL << VIRTIO_NET_F_GUEST_UFO); 500 501 return guest_offloads_mask & features; 502 } 503 504 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 505 { 506 VirtIODevice *vdev = VIRTIO_DEVICE(n); 507 return virtio_net_guest_offloads_by_features(vdev->guest_features); 508 } 509 510 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 511 { 512 VirtIONet *n = VIRTIO_NET(vdev); 513 int i; 514 515 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); 516 517 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 518 519 if (n->has_vnet_hdr) { 520 n->curr_guest_offloads = 521 virtio_net_guest_offloads_by_features(features); 522 virtio_net_apply_guest_offloads(n); 523 } 524 525 for (i = 0; i < n->max_queues; i++) { 526 NetClientState *nc = qemu_get_subqueue(n->nic, i); 527 528 if (!get_vhost_net(nc->peer)) { 529 continue; 530 } 531 vhost_net_ack_features(get_vhost_net(nc->peer), features); 532 } 533 534 if ((1 << VIRTIO_NET_F_CTRL_VLAN) & features) { 535 memset(n->vlans, 0, MAX_VLAN >> 3); 536 } else { 537 memset(n->vlans, 0xff, MAX_VLAN >> 3); 538 } 539 } 540 541 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 542 struct iovec *iov, unsigned int iov_cnt) 543 { 544 uint8_t on; 545 size_t s; 546 NetClientState *nc = qemu_get_queue(n->nic); 547 548 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 549 if (s != sizeof(on)) { 550 return VIRTIO_NET_ERR; 551 } 552 553 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 554 n->promisc = on; 555 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 556 n->allmulti = on; 557 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 558 n->alluni = on; 559 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 560 n->nomulti = on; 561 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 562 n->nouni = on; 563 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 564 n->nobcast = on; 565 } else { 566 return VIRTIO_NET_ERR; 567 } 568 569 rxfilter_notify(nc); 570 571 return VIRTIO_NET_OK; 572 } 573 574 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 575 struct iovec *iov, unsigned int iov_cnt) 576 { 577 VirtIODevice *vdev = VIRTIO_DEVICE(n); 578 uint64_t offloads; 579 size_t s; 580 581 if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) { 582 return VIRTIO_NET_ERR; 583 } 584 585 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 586 if (s != sizeof(offloads)) { 587 return VIRTIO_NET_ERR; 588 } 589 590 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 591 uint64_t supported_offloads; 592 593 if (!n->has_vnet_hdr) { 594 return VIRTIO_NET_ERR; 595 } 596 597 supported_offloads = virtio_net_supported_guest_offloads(n); 598 if (offloads & ~supported_offloads) { 599 return VIRTIO_NET_ERR; 600 } 601 602 n->curr_guest_offloads = offloads; 603 virtio_net_apply_guest_offloads(n); 604 605 return VIRTIO_NET_OK; 606 } else { 607 return VIRTIO_NET_ERR; 608 } 609 } 610 611 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 612 struct iovec *iov, unsigned int iov_cnt) 613 { 614 struct virtio_net_ctrl_mac mac_data; 615 size_t s; 616 NetClientState *nc = qemu_get_queue(n->nic); 617 618 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 619 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 620 return VIRTIO_NET_ERR; 621 } 622 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 623 assert(s == sizeof(n->mac)); 624 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 625 rxfilter_notify(nc); 626 627 return VIRTIO_NET_OK; 628 } 629 630 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 631 return VIRTIO_NET_ERR; 632 } 633 634 int in_use = 0; 635 int first_multi = 0; 636 uint8_t uni_overflow = 0; 637 uint8_t multi_overflow = 0; 638 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 639 640 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 641 sizeof(mac_data.entries)); 642 mac_data.entries = ldl_p(&mac_data.entries); 643 if (s != sizeof(mac_data.entries)) { 644 goto error; 645 } 646 iov_discard_front(&iov, &iov_cnt, s); 647 648 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 649 goto error; 650 } 651 652 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 653 s = iov_to_buf(iov, iov_cnt, 0, macs, 654 mac_data.entries * ETH_ALEN); 655 if (s != mac_data.entries * ETH_ALEN) { 656 goto error; 657 } 658 in_use += mac_data.entries; 659 } else { 660 uni_overflow = 1; 661 } 662 663 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 664 665 first_multi = in_use; 666 667 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 668 sizeof(mac_data.entries)); 669 mac_data.entries = ldl_p(&mac_data.entries); 670 if (s != sizeof(mac_data.entries)) { 671 goto error; 672 } 673 674 iov_discard_front(&iov, &iov_cnt, s); 675 676 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 677 goto error; 678 } 679 680 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 681 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 682 mac_data.entries * ETH_ALEN); 683 if (s != mac_data.entries * ETH_ALEN) { 684 goto error; 685 } 686 in_use += mac_data.entries; 687 } else { 688 multi_overflow = 1; 689 } 690 691 n->mac_table.in_use = in_use; 692 n->mac_table.first_multi = first_multi; 693 n->mac_table.uni_overflow = uni_overflow; 694 n->mac_table.multi_overflow = multi_overflow; 695 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 696 g_free(macs); 697 rxfilter_notify(nc); 698 699 return VIRTIO_NET_OK; 700 701 error: 702 g_free(macs); 703 return VIRTIO_NET_ERR; 704 } 705 706 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 707 struct iovec *iov, unsigned int iov_cnt) 708 { 709 uint16_t vid; 710 size_t s; 711 NetClientState *nc = qemu_get_queue(n->nic); 712 713 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 714 vid = lduw_p(&vid); 715 if (s != sizeof(vid)) { 716 return VIRTIO_NET_ERR; 717 } 718 719 if (vid >= MAX_VLAN) 720 return VIRTIO_NET_ERR; 721 722 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 723 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 724 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 725 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 726 else 727 return VIRTIO_NET_ERR; 728 729 rxfilter_notify(nc); 730 731 return VIRTIO_NET_OK; 732 } 733 734 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 735 struct iovec *iov, unsigned int iov_cnt) 736 { 737 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 738 n->status & VIRTIO_NET_S_ANNOUNCE) { 739 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 740 if (n->announce_counter) { 741 timer_mod(n->announce_timer, 742 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 743 self_announce_delay(n->announce_counter)); 744 } 745 return VIRTIO_NET_OK; 746 } else { 747 return VIRTIO_NET_ERR; 748 } 749 } 750 751 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 752 struct iovec *iov, unsigned int iov_cnt) 753 { 754 VirtIODevice *vdev = VIRTIO_DEVICE(n); 755 struct virtio_net_ctrl_mq mq; 756 size_t s; 757 uint16_t queues; 758 759 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 760 if (s != sizeof(mq)) { 761 return VIRTIO_NET_ERR; 762 } 763 764 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 765 return VIRTIO_NET_ERR; 766 } 767 768 queues = lduw_p(&mq.virtqueue_pairs); 769 770 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 771 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 772 queues > n->max_queues || 773 !n->multiqueue) { 774 return VIRTIO_NET_ERR; 775 } 776 777 n->curr_queues = queues; 778 /* stop the backend before changing the number of queues to avoid handling a 779 * disabled queue */ 780 virtio_net_set_status(vdev, vdev->status); 781 virtio_net_set_queues(n); 782 783 return VIRTIO_NET_OK; 784 } 785 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 786 { 787 VirtIONet *n = VIRTIO_NET(vdev); 788 struct virtio_net_ctrl_hdr ctrl; 789 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 790 VirtQueueElement elem; 791 size_t s; 792 struct iovec *iov; 793 unsigned int iov_cnt; 794 795 while (virtqueue_pop(vq, &elem)) { 796 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 797 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 798 error_report("virtio-net ctrl missing headers"); 799 exit(1); 800 } 801 802 iov = elem.out_sg; 803 iov_cnt = elem.out_num; 804 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 805 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 806 if (s != sizeof(ctrl)) { 807 status = VIRTIO_NET_ERR; 808 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 809 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 810 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 811 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 812 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 813 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 814 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 815 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 816 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 817 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 818 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 819 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 820 } 821 822 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 823 assert(s == sizeof(status)); 824 825 virtqueue_push(vq, &elem, sizeof(status)); 826 virtio_notify(vdev, vq); 827 } 828 } 829 830 /* RX */ 831 832 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 833 { 834 VirtIONet *n = VIRTIO_NET(vdev); 835 int queue_index = vq2q(virtio_get_queue_index(vq)); 836 837 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 838 } 839 840 static int virtio_net_can_receive(NetClientState *nc) 841 { 842 VirtIONet *n = qemu_get_nic_opaque(nc); 843 VirtIODevice *vdev = VIRTIO_DEVICE(n); 844 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 845 846 if (!vdev->vm_running) { 847 return 0; 848 } 849 850 if (nc->queue_index >= n->curr_queues) { 851 return 0; 852 } 853 854 if (!virtio_queue_ready(q->rx_vq) || 855 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 856 return 0; 857 } 858 859 return 1; 860 } 861 862 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 863 { 864 VirtIONet *n = q->n; 865 if (virtio_queue_empty(q->rx_vq) || 866 (n->mergeable_rx_bufs && 867 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 868 virtio_queue_set_notification(q->rx_vq, 1); 869 870 /* To avoid a race condition where the guest has made some buffers 871 * available after the above check but before notification was 872 * enabled, check for available buffers again. 873 */ 874 if (virtio_queue_empty(q->rx_vq) || 875 (n->mergeable_rx_bufs && 876 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 877 return 0; 878 } 879 } 880 881 virtio_queue_set_notification(q->rx_vq, 0); 882 return 1; 883 } 884 885 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 886 * it never finds out that the packets don't have valid checksums. This 887 * causes dhclient to get upset. Fedora's carried a patch for ages to 888 * fix this with Xen but it hasn't appeared in an upstream release of 889 * dhclient yet. 890 * 891 * To avoid breaking existing guests, we catch udp packets and add 892 * checksums. This is terrible but it's better than hacking the guest 893 * kernels. 894 * 895 * N.B. if we introduce a zero-copy API, this operation is no longer free so 896 * we should provide a mechanism to disable it to avoid polluting the host 897 * cache. 898 */ 899 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 900 uint8_t *buf, size_t size) 901 { 902 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 903 (size > 27 && size < 1500) && /* normal sized MTU */ 904 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 905 (buf[23] == 17) && /* ip.protocol == UDP */ 906 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 907 net_checksum_calculate(buf, size); 908 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 909 } 910 } 911 912 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 913 const void *buf, size_t size) 914 { 915 if (n->has_vnet_hdr) { 916 /* FIXME this cast is evil */ 917 void *wbuf = (void *)buf; 918 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 919 size - n->host_hdr_len); 920 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 921 } else { 922 struct virtio_net_hdr hdr = { 923 .flags = 0, 924 .gso_type = VIRTIO_NET_HDR_GSO_NONE 925 }; 926 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 927 } 928 } 929 930 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 931 { 932 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 933 static const uint8_t vlan[] = {0x81, 0x00}; 934 uint8_t *ptr = (uint8_t *)buf; 935 int i; 936 937 if (n->promisc) 938 return 1; 939 940 ptr += n->host_hdr_len; 941 942 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 943 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 944 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 945 return 0; 946 } 947 948 if (ptr[0] & 1) { // multicast 949 if (!memcmp(ptr, bcast, sizeof(bcast))) { 950 return !n->nobcast; 951 } else if (n->nomulti) { 952 return 0; 953 } else if (n->allmulti || n->mac_table.multi_overflow) { 954 return 1; 955 } 956 957 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 958 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 959 return 1; 960 } 961 } 962 } else { // unicast 963 if (n->nouni) { 964 return 0; 965 } else if (n->alluni || n->mac_table.uni_overflow) { 966 return 1; 967 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 968 return 1; 969 } 970 971 for (i = 0; i < n->mac_table.first_multi; i++) { 972 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 973 return 1; 974 } 975 } 976 } 977 978 return 0; 979 } 980 981 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 982 { 983 VirtIONet *n = qemu_get_nic_opaque(nc); 984 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 985 VirtIODevice *vdev = VIRTIO_DEVICE(n); 986 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 987 struct virtio_net_hdr_mrg_rxbuf mhdr; 988 unsigned mhdr_cnt = 0; 989 size_t offset, i, guest_offset; 990 991 if (!virtio_net_can_receive(nc)) { 992 return -1; 993 } 994 995 /* hdr_len refers to the header we supply to the guest */ 996 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 997 return 0; 998 } 999 1000 if (!receive_filter(n, buf, size)) 1001 return size; 1002 1003 offset = i = 0; 1004 1005 while (offset < size) { 1006 VirtQueueElement elem; 1007 int len, total; 1008 const struct iovec *sg = elem.in_sg; 1009 1010 total = 0; 1011 1012 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1013 if (i == 0) 1014 return -1; 1015 error_report("virtio-net unexpected empty queue: " 1016 "i %zd mergeable %d offset %zd, size %zd, " 1017 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 1018 i, n->mergeable_rx_bufs, offset, size, 1019 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 1020 exit(1); 1021 } 1022 1023 if (elem.in_num < 1) { 1024 error_report("virtio-net receive queue contains no in buffers"); 1025 exit(1); 1026 } 1027 1028 if (i == 0) { 1029 assert(offset == 0); 1030 if (n->mergeable_rx_bufs) { 1031 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1032 sg, elem.in_num, 1033 offsetof(typeof(mhdr), num_buffers), 1034 sizeof(mhdr.num_buffers)); 1035 } 1036 1037 receive_header(n, sg, elem.in_num, buf, size); 1038 offset = n->host_hdr_len; 1039 total += n->guest_hdr_len; 1040 guest_offset = n->guest_hdr_len; 1041 } else { 1042 guest_offset = 0; 1043 } 1044 1045 /* copy in packet. ugh */ 1046 len = iov_from_buf(sg, elem.in_num, guest_offset, 1047 buf + offset, size - offset); 1048 total += len; 1049 offset += len; 1050 /* If buffers can't be merged, at this point we 1051 * must have consumed the complete packet. 1052 * Otherwise, drop it. */ 1053 if (!n->mergeable_rx_bufs && offset < size) { 1054 #if 0 1055 error_report("virtio-net truncated non-mergeable packet: " 1056 "i %zd mergeable %d offset %zd, size %zd, " 1057 "guest hdr len %zd, host hdr len %zd", 1058 i, n->mergeable_rx_bufs, 1059 offset, size, n->guest_hdr_len, n->host_hdr_len); 1060 #endif 1061 return size; 1062 } 1063 1064 /* signal other side */ 1065 virtqueue_fill(q->rx_vq, &elem, total, i++); 1066 } 1067 1068 if (mhdr_cnt) { 1069 stw_p(&mhdr.num_buffers, i); 1070 iov_from_buf(mhdr_sg, mhdr_cnt, 1071 0, 1072 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1073 } 1074 1075 virtqueue_flush(q->rx_vq, i); 1076 virtio_notify(vdev, q->rx_vq); 1077 1078 return size; 1079 } 1080 1081 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1082 1083 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1084 { 1085 VirtIONet *n = qemu_get_nic_opaque(nc); 1086 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1087 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1088 1089 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1090 virtio_notify(vdev, q->tx_vq); 1091 1092 q->async_tx.elem.out_num = q->async_tx.len = 0; 1093 1094 virtio_queue_set_notification(q->tx_vq, 1); 1095 virtio_net_flush_tx(q); 1096 } 1097 1098 /* TX */ 1099 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1100 { 1101 VirtIONet *n = q->n; 1102 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1103 VirtQueueElement elem; 1104 int32_t num_packets = 0; 1105 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1106 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1107 return num_packets; 1108 } 1109 1110 assert(vdev->vm_running); 1111 1112 if (q->async_tx.elem.out_num) { 1113 virtio_queue_set_notification(q->tx_vq, 0); 1114 return num_packets; 1115 } 1116 1117 while (virtqueue_pop(q->tx_vq, &elem)) { 1118 ssize_t ret, len; 1119 unsigned int out_num = elem.out_num; 1120 struct iovec *out_sg = &elem.out_sg[0]; 1121 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1122 1123 if (out_num < 1) { 1124 error_report("virtio-net header not in first element"); 1125 exit(1); 1126 } 1127 1128 /* 1129 * If host wants to see the guest header as is, we can 1130 * pass it on unchanged. Otherwise, copy just the parts 1131 * that host is interested in. 1132 */ 1133 assert(n->host_hdr_len <= n->guest_hdr_len); 1134 if (n->host_hdr_len != n->guest_hdr_len) { 1135 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1136 out_sg, out_num, 1137 0, n->host_hdr_len); 1138 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1139 out_sg, out_num, 1140 n->guest_hdr_len, -1); 1141 out_num = sg_num; 1142 out_sg = sg; 1143 } 1144 1145 len = n->guest_hdr_len; 1146 1147 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1148 out_sg, out_num, virtio_net_tx_complete); 1149 if (ret == 0) { 1150 virtio_queue_set_notification(q->tx_vq, 0); 1151 q->async_tx.elem = elem; 1152 q->async_tx.len = len; 1153 return -EBUSY; 1154 } 1155 1156 len += ret; 1157 1158 virtqueue_push(q->tx_vq, &elem, 0); 1159 virtio_notify(vdev, q->tx_vq); 1160 1161 if (++num_packets >= n->tx_burst) { 1162 break; 1163 } 1164 } 1165 return num_packets; 1166 } 1167 1168 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1169 { 1170 VirtIONet *n = VIRTIO_NET(vdev); 1171 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1172 1173 /* This happens when device was stopped but VCPU wasn't. */ 1174 if (!vdev->vm_running) { 1175 q->tx_waiting = 1; 1176 return; 1177 } 1178 1179 if (q->tx_waiting) { 1180 virtio_queue_set_notification(vq, 1); 1181 timer_del(q->tx_timer); 1182 q->tx_waiting = 0; 1183 virtio_net_flush_tx(q); 1184 } else { 1185 timer_mod(q->tx_timer, 1186 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1187 q->tx_waiting = 1; 1188 virtio_queue_set_notification(vq, 0); 1189 } 1190 } 1191 1192 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1193 { 1194 VirtIONet *n = VIRTIO_NET(vdev); 1195 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1196 1197 if (unlikely(q->tx_waiting)) { 1198 return; 1199 } 1200 q->tx_waiting = 1; 1201 /* This happens when device was stopped but VCPU wasn't. */ 1202 if (!vdev->vm_running) { 1203 return; 1204 } 1205 virtio_queue_set_notification(vq, 0); 1206 qemu_bh_schedule(q->tx_bh); 1207 } 1208 1209 static void virtio_net_tx_timer(void *opaque) 1210 { 1211 VirtIONetQueue *q = opaque; 1212 VirtIONet *n = q->n; 1213 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1214 assert(vdev->vm_running); 1215 1216 q->tx_waiting = 0; 1217 1218 /* Just in case the driver is not ready on more */ 1219 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1220 return; 1221 } 1222 1223 virtio_queue_set_notification(q->tx_vq, 1); 1224 virtio_net_flush_tx(q); 1225 } 1226 1227 static void virtio_net_tx_bh(void *opaque) 1228 { 1229 VirtIONetQueue *q = opaque; 1230 VirtIONet *n = q->n; 1231 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1232 int32_t ret; 1233 1234 assert(vdev->vm_running); 1235 1236 q->tx_waiting = 0; 1237 1238 /* Just in case the driver is not ready on more */ 1239 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1240 return; 1241 } 1242 1243 ret = virtio_net_flush_tx(q); 1244 if (ret == -EBUSY) { 1245 return; /* Notification re-enable handled by tx_complete */ 1246 } 1247 1248 /* If we flush a full burst of packets, assume there are 1249 * more coming and immediately reschedule */ 1250 if (ret >= n->tx_burst) { 1251 qemu_bh_schedule(q->tx_bh); 1252 q->tx_waiting = 1; 1253 return; 1254 } 1255 1256 /* If less than a full burst, re-enable notification and flush 1257 * anything that may have come in while we weren't looking. If 1258 * we find something, assume the guest is still active and reschedule */ 1259 virtio_queue_set_notification(q->tx_vq, 1); 1260 if (virtio_net_flush_tx(q) > 0) { 1261 virtio_queue_set_notification(q->tx_vq, 0); 1262 qemu_bh_schedule(q->tx_bh); 1263 q->tx_waiting = 1; 1264 } 1265 } 1266 1267 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1268 { 1269 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1270 int i, max = multiqueue ? n->max_queues : 1; 1271 1272 n->multiqueue = multiqueue; 1273 1274 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1275 virtio_del_queue(vdev, i); 1276 } 1277 1278 for (i = 1; i < max; i++) { 1279 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1280 if (n->vqs[i].tx_timer) { 1281 n->vqs[i].tx_vq = 1282 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1283 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1284 virtio_net_tx_timer, 1285 &n->vqs[i]); 1286 } else { 1287 n->vqs[i].tx_vq = 1288 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1289 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1290 } 1291 1292 n->vqs[i].tx_waiting = 0; 1293 n->vqs[i].n = n; 1294 } 1295 1296 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1297 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1298 * breaking them. 1299 */ 1300 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1301 1302 virtio_net_set_queues(n); 1303 } 1304 1305 static void virtio_net_save(QEMUFile *f, void *opaque) 1306 { 1307 int i; 1308 VirtIONet *n = opaque; 1309 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1310 1311 /* At this point, backend must be stopped, otherwise 1312 * it might keep writing to memory. */ 1313 assert(!n->vhost_started); 1314 virtio_save(vdev, f); 1315 1316 qemu_put_buffer(f, n->mac, ETH_ALEN); 1317 qemu_put_be32(f, n->vqs[0].tx_waiting); 1318 qemu_put_be32(f, n->mergeable_rx_bufs); 1319 qemu_put_be16(f, n->status); 1320 qemu_put_byte(f, n->promisc); 1321 qemu_put_byte(f, n->allmulti); 1322 qemu_put_be32(f, n->mac_table.in_use); 1323 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1324 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1325 qemu_put_be32(f, n->has_vnet_hdr); 1326 qemu_put_byte(f, n->mac_table.multi_overflow); 1327 qemu_put_byte(f, n->mac_table.uni_overflow); 1328 qemu_put_byte(f, n->alluni); 1329 qemu_put_byte(f, n->nomulti); 1330 qemu_put_byte(f, n->nouni); 1331 qemu_put_byte(f, n->nobcast); 1332 qemu_put_byte(f, n->has_ufo); 1333 if (n->max_queues > 1) { 1334 qemu_put_be16(f, n->max_queues); 1335 qemu_put_be16(f, n->curr_queues); 1336 for (i = 1; i < n->curr_queues; i++) { 1337 qemu_put_be32(f, n->vqs[i].tx_waiting); 1338 } 1339 } 1340 1341 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1342 qemu_put_be64(f, n->curr_guest_offloads); 1343 } 1344 } 1345 1346 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1347 { 1348 VirtIONet *n = opaque; 1349 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1350 int ret, i, link_down; 1351 1352 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1353 return -EINVAL; 1354 1355 ret = virtio_load(vdev, f); 1356 if (ret) { 1357 return ret; 1358 } 1359 1360 qemu_get_buffer(f, n->mac, ETH_ALEN); 1361 n->vqs[0].tx_waiting = qemu_get_be32(f); 1362 1363 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1364 1365 if (version_id >= 3) 1366 n->status = qemu_get_be16(f); 1367 1368 if (version_id >= 4) { 1369 if (version_id < 8) { 1370 n->promisc = qemu_get_be32(f); 1371 n->allmulti = qemu_get_be32(f); 1372 } else { 1373 n->promisc = qemu_get_byte(f); 1374 n->allmulti = qemu_get_byte(f); 1375 } 1376 } 1377 1378 if (version_id >= 5) { 1379 n->mac_table.in_use = qemu_get_be32(f); 1380 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1381 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1382 qemu_get_buffer(f, n->mac_table.macs, 1383 n->mac_table.in_use * ETH_ALEN); 1384 } else { 1385 int64_t i; 1386 1387 /* Overflow detected - can happen if source has a larger MAC table. 1388 * We simply set overflow flag so there's no need to maintain the 1389 * table of addresses, discard them all. 1390 * Note: 64 bit math to avoid integer overflow. 1391 */ 1392 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1393 qemu_get_byte(f); 1394 } 1395 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1396 n->mac_table.in_use = 0; 1397 } 1398 } 1399 1400 if (version_id >= 6) 1401 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1402 1403 if (version_id >= 7) { 1404 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1405 error_report("virtio-net: saved image requires vnet_hdr=on"); 1406 return -1; 1407 } 1408 } 1409 1410 if (version_id >= 9) { 1411 n->mac_table.multi_overflow = qemu_get_byte(f); 1412 n->mac_table.uni_overflow = qemu_get_byte(f); 1413 } 1414 1415 if (version_id >= 10) { 1416 n->alluni = qemu_get_byte(f); 1417 n->nomulti = qemu_get_byte(f); 1418 n->nouni = qemu_get_byte(f); 1419 n->nobcast = qemu_get_byte(f); 1420 } 1421 1422 if (version_id >= 11) { 1423 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1424 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1425 return -1; 1426 } 1427 } 1428 1429 if (n->max_queues > 1) { 1430 if (n->max_queues != qemu_get_be16(f)) { 1431 error_report("virtio-net: different max_queues "); 1432 return -1; 1433 } 1434 1435 n->curr_queues = qemu_get_be16(f); 1436 if (n->curr_queues > n->max_queues) { 1437 error_report("virtio-net: curr_queues %x > max_queues %x", 1438 n->curr_queues, n->max_queues); 1439 return -1; 1440 } 1441 for (i = 1; i < n->curr_queues; i++) { 1442 n->vqs[i].tx_waiting = qemu_get_be32(f); 1443 } 1444 } 1445 1446 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1447 n->curr_guest_offloads = qemu_get_be64(f); 1448 } else { 1449 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1450 } 1451 1452 if (peer_has_vnet_hdr(n)) { 1453 virtio_net_apply_guest_offloads(n); 1454 } 1455 1456 virtio_net_set_queues(n); 1457 1458 /* Find the first multicast entry in the saved MAC filter */ 1459 for (i = 0; i < n->mac_table.in_use; i++) { 1460 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1461 break; 1462 } 1463 } 1464 n->mac_table.first_multi = i; 1465 1466 /* nc.link_down can't be migrated, so infer link_down according 1467 * to link status bit in n->status */ 1468 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1469 for (i = 0; i < n->max_queues; i++) { 1470 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1471 } 1472 1473 if (vdev->guest_features & (0x1 << VIRTIO_NET_F_GUEST_ANNOUNCE) && 1474 vdev->guest_features & (0x1 << VIRTIO_NET_F_CTRL_VQ)) { 1475 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1476 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1477 } 1478 1479 return 0; 1480 } 1481 1482 static void virtio_net_cleanup(NetClientState *nc) 1483 { 1484 VirtIONet *n = qemu_get_nic_opaque(nc); 1485 1486 n->nic = NULL; 1487 } 1488 1489 static NetClientInfo net_virtio_info = { 1490 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1491 .size = sizeof(NICState), 1492 .can_receive = virtio_net_can_receive, 1493 .receive = virtio_net_receive, 1494 .cleanup = virtio_net_cleanup, 1495 .link_status_changed = virtio_net_set_link_status, 1496 .query_rx_filter = virtio_net_query_rxfilter, 1497 }; 1498 1499 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1500 { 1501 VirtIONet *n = VIRTIO_NET(vdev); 1502 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1503 assert(n->vhost_started); 1504 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1505 } 1506 1507 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1508 bool mask) 1509 { 1510 VirtIONet *n = VIRTIO_NET(vdev); 1511 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1512 assert(n->vhost_started); 1513 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1514 vdev, idx, mask); 1515 } 1516 1517 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1518 { 1519 int i, config_size = 0; 1520 host_features |= (1 << VIRTIO_NET_F_MAC); 1521 for (i = 0; feature_sizes[i].flags != 0; i++) { 1522 if (host_features & feature_sizes[i].flags) { 1523 config_size = MAX(feature_sizes[i].end, config_size); 1524 } 1525 } 1526 n->config_size = config_size; 1527 } 1528 1529 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1530 const char *type) 1531 { 1532 /* 1533 * The name can be NULL, the netclient name will be type.x. 1534 */ 1535 assert(type != NULL); 1536 1537 g_free(n->netclient_name); 1538 g_free(n->netclient_type); 1539 n->netclient_name = g_strdup(name); 1540 n->netclient_type = g_strdup(type); 1541 } 1542 1543 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1544 { 1545 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1546 VirtIONet *n = VIRTIO_NET(dev); 1547 NetClientState *nc; 1548 int i; 1549 1550 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1551 1552 n->max_queues = MAX(n->nic_conf.queues, 1); 1553 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1554 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1555 n->curr_queues = 1; 1556 n->vqs[0].n = n; 1557 n->tx_timeout = n->net_conf.txtimer; 1558 1559 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1560 && strcmp(n->net_conf.tx, "bh")) { 1561 error_report("virtio-net: " 1562 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1563 n->net_conf.tx); 1564 error_report("Defaulting to \"bh\""); 1565 } 1566 1567 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1568 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1569 virtio_net_handle_tx_timer); 1570 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, 1571 &n->vqs[0]); 1572 } else { 1573 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1574 virtio_net_handle_tx_bh); 1575 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1576 } 1577 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1578 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1579 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1580 n->status = VIRTIO_NET_S_LINK_UP; 1581 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1582 virtio_net_announce_timer, n); 1583 1584 if (n->netclient_type) { 1585 /* 1586 * Happen when virtio_net_set_netclient_name has been called. 1587 */ 1588 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1589 n->netclient_type, n->netclient_name, n); 1590 } else { 1591 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1592 object_get_typename(OBJECT(dev)), dev->id, n); 1593 } 1594 1595 peer_test_vnet_hdr(n); 1596 if (peer_has_vnet_hdr(n)) { 1597 for (i = 0; i < n->max_queues; i++) { 1598 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1599 } 1600 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1601 } else { 1602 n->host_hdr_len = 0; 1603 } 1604 1605 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1606 1607 n->vqs[0].tx_waiting = 0; 1608 n->tx_burst = n->net_conf.txburst; 1609 virtio_net_set_mrg_rx_bufs(n, 0); 1610 n->promisc = 1; /* for compatibility */ 1611 1612 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1613 1614 n->vlans = g_malloc0(MAX_VLAN >> 3); 1615 1616 nc = qemu_get_queue(n->nic); 1617 nc->rxfilter_notify_enabled = 1; 1618 1619 n->qdev = dev; 1620 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1621 virtio_net_save, virtio_net_load, n); 1622 1623 add_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0"); 1624 } 1625 1626 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1627 { 1628 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1629 VirtIONet *n = VIRTIO_NET(dev); 1630 int i; 1631 1632 /* This will stop vhost backend if appropriate. */ 1633 virtio_net_set_status(vdev, 0); 1634 1635 unregister_savevm(dev, "virtio-net", n); 1636 1637 g_free(n->netclient_name); 1638 n->netclient_name = NULL; 1639 g_free(n->netclient_type); 1640 n->netclient_type = NULL; 1641 1642 g_free(n->mac_table.macs); 1643 g_free(n->vlans); 1644 1645 for (i = 0; i < n->max_queues; i++) { 1646 VirtIONetQueue *q = &n->vqs[i]; 1647 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1648 1649 qemu_purge_queued_packets(nc); 1650 1651 if (q->tx_timer) { 1652 timer_del(q->tx_timer); 1653 timer_free(q->tx_timer); 1654 } else if (q->tx_bh) { 1655 qemu_bh_delete(q->tx_bh); 1656 } 1657 } 1658 1659 timer_del(n->announce_timer); 1660 timer_free(n->announce_timer); 1661 g_free(n->vqs); 1662 qemu_del_nic(n->nic); 1663 virtio_cleanup(vdev); 1664 } 1665 1666 static void virtio_net_instance_init(Object *obj) 1667 { 1668 VirtIONet *n = VIRTIO_NET(obj); 1669 1670 /* 1671 * The default config_size is sizeof(struct virtio_net_config). 1672 * Can be overriden with virtio_net_set_config_size. 1673 */ 1674 n->config_size = sizeof(struct virtio_net_config); 1675 } 1676 1677 static Property virtio_net_properties[] = { 1678 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1679 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1680 TX_TIMER_INTERVAL), 1681 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1682 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1683 DEFINE_PROP_END_OF_LIST(), 1684 }; 1685 1686 static void virtio_net_class_init(ObjectClass *klass, void *data) 1687 { 1688 DeviceClass *dc = DEVICE_CLASS(klass); 1689 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1690 1691 dc->props = virtio_net_properties; 1692 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1693 vdc->realize = virtio_net_device_realize; 1694 vdc->unrealize = virtio_net_device_unrealize; 1695 vdc->get_config = virtio_net_get_config; 1696 vdc->set_config = virtio_net_set_config; 1697 vdc->get_features = virtio_net_get_features; 1698 vdc->set_features = virtio_net_set_features; 1699 vdc->bad_features = virtio_net_bad_features; 1700 vdc->reset = virtio_net_reset; 1701 vdc->set_status = virtio_net_set_status; 1702 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1703 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1704 } 1705 1706 static const TypeInfo virtio_net_info = { 1707 .name = TYPE_VIRTIO_NET, 1708 .parent = TYPE_VIRTIO_DEVICE, 1709 .instance_size = sizeof(VirtIONet), 1710 .instance_init = virtio_net_instance_init, 1711 .class_init = virtio_net_class_init, 1712 }; 1713 1714 static void virtio_register_types(void) 1715 { 1716 type_register_static(&virtio_net_info); 1717 } 1718 1719 type_init(virtio_register_types) 1720