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 (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && 90 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 91 memcpy(n->mac, netcfg.mac, ETH_ALEN); 92 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 93 } 94 } 95 96 static bool virtio_net_started(VirtIONet *n, uint8_t status) 97 { 98 VirtIODevice *vdev = VIRTIO_DEVICE(n); 99 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 100 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 101 } 102 103 static void virtio_net_announce_timer(void *opaque) 104 { 105 VirtIONet *n = opaque; 106 VirtIODevice *vdev = VIRTIO_DEVICE(n); 107 108 n->announce_counter--; 109 n->status |= VIRTIO_NET_S_ANNOUNCE; 110 virtio_notify_config(vdev); 111 } 112 113 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 114 { 115 VirtIODevice *vdev = VIRTIO_DEVICE(n); 116 NetClientState *nc = qemu_get_queue(n->nic); 117 int queues = n->multiqueue ? n->max_queues : 1; 118 119 if (!get_vhost_net(nc->peer)) { 120 return; 121 } 122 123 if (!!n->vhost_started == 124 (virtio_net_started(n, status) && !nc->peer->link_down)) { 125 return; 126 } 127 if (!n->vhost_started) { 128 int r; 129 if (!vhost_net_query(get_vhost_net(nc->peer), vdev)) { 130 return; 131 } 132 n->vhost_started = 1; 133 r = vhost_net_start(vdev, n->nic->ncs, queues); 134 if (r < 0) { 135 error_report("unable to start vhost net: %d: " 136 "falling back on userspace virtio", -r); 137 n->vhost_started = 0; 138 } 139 } else { 140 vhost_net_stop(vdev, n->nic->ncs, queues); 141 n->vhost_started = 0; 142 } 143 } 144 145 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 146 { 147 VirtIONet *n = VIRTIO_NET(vdev); 148 VirtIONetQueue *q; 149 int i; 150 uint8_t queue_status; 151 152 virtio_net_vhost_status(n, status); 153 154 for (i = 0; i < n->max_queues; i++) { 155 q = &n->vqs[i]; 156 157 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 158 queue_status = 0; 159 } else { 160 queue_status = status; 161 } 162 163 if (!q->tx_waiting) { 164 continue; 165 } 166 167 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 168 if (q->tx_timer) { 169 timer_mod(q->tx_timer, 170 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 171 } else { 172 qemu_bh_schedule(q->tx_bh); 173 } 174 } else { 175 if (q->tx_timer) { 176 timer_del(q->tx_timer); 177 } else { 178 qemu_bh_cancel(q->tx_bh); 179 } 180 } 181 } 182 } 183 184 static void virtio_net_set_link_status(NetClientState *nc) 185 { 186 VirtIONet *n = qemu_get_nic_opaque(nc); 187 VirtIODevice *vdev = VIRTIO_DEVICE(n); 188 uint16_t old_status = n->status; 189 190 if (nc->link_down) 191 n->status &= ~VIRTIO_NET_S_LINK_UP; 192 else 193 n->status |= VIRTIO_NET_S_LINK_UP; 194 195 if (n->status != old_status) 196 virtio_notify_config(vdev); 197 198 virtio_net_set_status(vdev, vdev->status); 199 } 200 201 static void rxfilter_notify(NetClientState *nc) 202 { 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 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 208 n->netclient_name, path, &error_abort); 209 g_free(path); 210 211 /* disable event notification to avoid events flooding */ 212 nc->rxfilter_notify_enabled = 0; 213 } 214 } 215 216 static char *mac_strdup_printf(const uint8_t *mac) 217 { 218 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0], 219 mac[1], mac[2], mac[3], mac[4], mac[5]); 220 } 221 222 static intList *get_vlan_table(VirtIONet *n) 223 { 224 intList *list, *entry; 225 int i, j; 226 227 list = NULL; 228 for (i = 0; i < MAX_VLAN >> 5; i++) { 229 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 230 if (n->vlans[i] & (1U << j)) { 231 entry = g_malloc0(sizeof(*entry)); 232 entry->value = (i << 5) + j; 233 entry->next = list; 234 list = entry; 235 } 236 } 237 } 238 239 return list; 240 } 241 242 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 243 { 244 VirtIONet *n = qemu_get_nic_opaque(nc); 245 VirtIODevice *vdev = VIRTIO_DEVICE(n); 246 RxFilterInfo *info; 247 strList *str_list, *entry; 248 int i; 249 250 info = g_malloc0(sizeof(*info)); 251 info->name = g_strdup(nc->name); 252 info->promiscuous = n->promisc; 253 254 if (n->nouni) { 255 info->unicast = RX_STATE_NONE; 256 } else if (n->alluni) { 257 info->unicast = RX_STATE_ALL; 258 } else { 259 info->unicast = RX_STATE_NORMAL; 260 } 261 262 if (n->nomulti) { 263 info->multicast = RX_STATE_NONE; 264 } else if (n->allmulti) { 265 info->multicast = RX_STATE_ALL; 266 } else { 267 info->multicast = RX_STATE_NORMAL; 268 } 269 270 info->broadcast_allowed = n->nobcast; 271 info->multicast_overflow = n->mac_table.multi_overflow; 272 info->unicast_overflow = n->mac_table.uni_overflow; 273 274 info->main_mac = mac_strdup_printf(n->mac); 275 276 str_list = NULL; 277 for (i = 0; i < n->mac_table.first_multi; i++) { 278 entry = g_malloc0(sizeof(*entry)); 279 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 280 entry->next = str_list; 281 str_list = entry; 282 } 283 info->unicast_table = str_list; 284 285 str_list = NULL; 286 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 287 entry = g_malloc0(sizeof(*entry)); 288 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 289 entry->next = str_list; 290 str_list = entry; 291 } 292 info->multicast_table = str_list; 293 info->vlan_table = get_vlan_table(n); 294 295 if (!((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features)) { 296 info->vlan = RX_STATE_ALL; 297 } else if (!info->vlan_table) { 298 info->vlan = RX_STATE_NONE; 299 } else { 300 info->vlan = RX_STATE_NORMAL; 301 } 302 303 /* enable event notification after query */ 304 nc->rxfilter_notify_enabled = 1; 305 306 return info; 307 } 308 309 static void virtio_net_reset(VirtIODevice *vdev) 310 { 311 VirtIONet *n = VIRTIO_NET(vdev); 312 313 /* Reset back to compatibility mode */ 314 n->promisc = 1; 315 n->allmulti = 0; 316 n->alluni = 0; 317 n->nomulti = 0; 318 n->nouni = 0; 319 n->nobcast = 0; 320 /* multiqueue is disabled by default */ 321 n->curr_queues = 1; 322 timer_del(n->announce_timer); 323 n->announce_counter = 0; 324 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 325 326 /* Flush any MAC and VLAN filter table state */ 327 n->mac_table.in_use = 0; 328 n->mac_table.first_multi = 0; 329 n->mac_table.multi_overflow = 0; 330 n->mac_table.uni_overflow = 0; 331 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 332 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 333 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 334 memset(n->vlans, 0, MAX_VLAN >> 3); 335 } 336 337 static void peer_test_vnet_hdr(VirtIONet *n) 338 { 339 NetClientState *nc = qemu_get_queue(n->nic); 340 if (!nc->peer) { 341 return; 342 } 343 344 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 345 } 346 347 static int peer_has_vnet_hdr(VirtIONet *n) 348 { 349 return n->has_vnet_hdr; 350 } 351 352 static int peer_has_ufo(VirtIONet *n) 353 { 354 if (!peer_has_vnet_hdr(n)) 355 return 0; 356 357 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 358 359 return n->has_ufo; 360 } 361 362 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 363 { 364 int i; 365 NetClientState *nc; 366 367 n->mergeable_rx_bufs = mergeable_rx_bufs; 368 369 n->guest_hdr_len = n->mergeable_rx_bufs ? 370 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 371 372 for (i = 0; i < n->max_queues; i++) { 373 nc = qemu_get_subqueue(n->nic, i); 374 375 if (peer_has_vnet_hdr(n) && 376 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 377 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 378 n->host_hdr_len = n->guest_hdr_len; 379 } 380 } 381 } 382 383 static int peer_attach(VirtIONet *n, int index) 384 { 385 NetClientState *nc = qemu_get_subqueue(n->nic, index); 386 387 if (!nc->peer) { 388 return 0; 389 } 390 391 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 392 return 0; 393 } 394 395 return tap_enable(nc->peer); 396 } 397 398 static int peer_detach(VirtIONet *n, int index) 399 { 400 NetClientState *nc = qemu_get_subqueue(n->nic, index); 401 402 if (!nc->peer) { 403 return 0; 404 } 405 406 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 407 return 0; 408 } 409 410 return tap_disable(nc->peer); 411 } 412 413 static void virtio_net_set_queues(VirtIONet *n) 414 { 415 int i; 416 int r; 417 418 for (i = 0; i < n->max_queues; i++) { 419 if (i < n->curr_queues) { 420 r = peer_attach(n, i); 421 assert(!r); 422 } else { 423 r = peer_detach(n, i); 424 assert(!r); 425 } 426 } 427 } 428 429 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 430 431 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 432 { 433 VirtIONet *n = VIRTIO_NET(vdev); 434 NetClientState *nc = qemu_get_queue(n->nic); 435 436 features |= (1 << VIRTIO_NET_F_MAC); 437 438 if (!peer_has_vnet_hdr(n)) { 439 features &= ~(0x1 << VIRTIO_NET_F_CSUM); 440 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); 441 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); 442 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); 443 444 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); 445 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); 446 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); 447 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); 448 } 449 450 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 451 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); 452 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); 453 } 454 455 if (!get_vhost_net(nc->peer)) { 456 return features; 457 } 458 return vhost_net_get_features(get_vhost_net(nc->peer), features); 459 } 460 461 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 462 { 463 uint32_t features = 0; 464 465 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 466 * but also these: */ 467 features |= (1 << VIRTIO_NET_F_MAC); 468 features |= (1 << VIRTIO_NET_F_CSUM); 469 features |= (1 << VIRTIO_NET_F_HOST_TSO4); 470 features |= (1 << VIRTIO_NET_F_HOST_TSO6); 471 features |= (1 << VIRTIO_NET_F_HOST_ECN); 472 473 return features; 474 } 475 476 static void virtio_net_apply_guest_offloads(VirtIONet *n) 477 { 478 qemu_set_offload(qemu_get_queue(n->nic)->peer, 479 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 480 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 481 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 482 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 483 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 484 } 485 486 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 487 { 488 static const uint64_t guest_offloads_mask = 489 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 490 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 491 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 492 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 493 (1ULL << VIRTIO_NET_F_GUEST_UFO); 494 495 return guest_offloads_mask & features; 496 } 497 498 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 499 { 500 VirtIODevice *vdev = VIRTIO_DEVICE(n); 501 return virtio_net_guest_offloads_by_features(vdev->guest_features); 502 } 503 504 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 505 { 506 VirtIONet *n = VIRTIO_NET(vdev); 507 int i; 508 509 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); 510 511 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 512 513 if (n->has_vnet_hdr) { 514 n->curr_guest_offloads = 515 virtio_net_guest_offloads_by_features(features); 516 virtio_net_apply_guest_offloads(n); 517 } 518 519 for (i = 0; i < n->max_queues; i++) { 520 NetClientState *nc = qemu_get_subqueue(n->nic, i); 521 522 if (!get_vhost_net(nc->peer)) { 523 continue; 524 } 525 vhost_net_ack_features(get_vhost_net(nc->peer), features); 526 } 527 528 if ((1 << VIRTIO_NET_F_CTRL_VLAN) & features) { 529 memset(n->vlans, 0, MAX_VLAN >> 3); 530 } else { 531 memset(n->vlans, 0xff, MAX_VLAN >> 3); 532 } 533 } 534 535 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 536 struct iovec *iov, unsigned int iov_cnt) 537 { 538 uint8_t on; 539 size_t s; 540 NetClientState *nc = qemu_get_queue(n->nic); 541 542 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 543 if (s != sizeof(on)) { 544 return VIRTIO_NET_ERR; 545 } 546 547 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 548 n->promisc = on; 549 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 550 n->allmulti = on; 551 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 552 n->alluni = on; 553 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 554 n->nomulti = on; 555 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 556 n->nouni = on; 557 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 558 n->nobcast = on; 559 } else { 560 return VIRTIO_NET_ERR; 561 } 562 563 rxfilter_notify(nc); 564 565 return VIRTIO_NET_OK; 566 } 567 568 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 569 struct iovec *iov, unsigned int iov_cnt) 570 { 571 VirtIODevice *vdev = VIRTIO_DEVICE(n); 572 uint64_t offloads; 573 size_t s; 574 575 if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) { 576 return VIRTIO_NET_ERR; 577 } 578 579 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 580 if (s != sizeof(offloads)) { 581 return VIRTIO_NET_ERR; 582 } 583 584 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 585 uint64_t supported_offloads; 586 587 if (!n->has_vnet_hdr) { 588 return VIRTIO_NET_ERR; 589 } 590 591 supported_offloads = virtio_net_supported_guest_offloads(n); 592 if (offloads & ~supported_offloads) { 593 return VIRTIO_NET_ERR; 594 } 595 596 n->curr_guest_offloads = offloads; 597 virtio_net_apply_guest_offloads(n); 598 599 return VIRTIO_NET_OK; 600 } else { 601 return VIRTIO_NET_ERR; 602 } 603 } 604 605 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 606 struct iovec *iov, unsigned int iov_cnt) 607 { 608 VirtIODevice *vdev = VIRTIO_DEVICE(n); 609 struct virtio_net_ctrl_mac mac_data; 610 size_t s; 611 NetClientState *nc = qemu_get_queue(n->nic); 612 613 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 614 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 615 return VIRTIO_NET_ERR; 616 } 617 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 618 assert(s == sizeof(n->mac)); 619 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 620 rxfilter_notify(nc); 621 622 return VIRTIO_NET_OK; 623 } 624 625 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 626 return VIRTIO_NET_ERR; 627 } 628 629 int in_use = 0; 630 int first_multi = 0; 631 uint8_t uni_overflow = 0; 632 uint8_t multi_overflow = 0; 633 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 634 635 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 636 sizeof(mac_data.entries)); 637 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 638 if (s != sizeof(mac_data.entries)) { 639 goto error; 640 } 641 iov_discard_front(&iov, &iov_cnt, s); 642 643 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 644 goto error; 645 } 646 647 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 648 s = iov_to_buf(iov, iov_cnt, 0, macs, 649 mac_data.entries * ETH_ALEN); 650 if (s != mac_data.entries * ETH_ALEN) { 651 goto error; 652 } 653 in_use += mac_data.entries; 654 } else { 655 uni_overflow = 1; 656 } 657 658 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 659 660 first_multi = in_use; 661 662 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 663 sizeof(mac_data.entries)); 664 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 665 if (s != sizeof(mac_data.entries)) { 666 goto error; 667 } 668 669 iov_discard_front(&iov, &iov_cnt, s); 670 671 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 672 goto error; 673 } 674 675 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 676 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 677 mac_data.entries * ETH_ALEN); 678 if (s != mac_data.entries * ETH_ALEN) { 679 goto error; 680 } 681 in_use += mac_data.entries; 682 } else { 683 multi_overflow = 1; 684 } 685 686 n->mac_table.in_use = in_use; 687 n->mac_table.first_multi = first_multi; 688 n->mac_table.uni_overflow = uni_overflow; 689 n->mac_table.multi_overflow = multi_overflow; 690 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 691 g_free(macs); 692 rxfilter_notify(nc); 693 694 return VIRTIO_NET_OK; 695 696 error: 697 g_free(macs); 698 return VIRTIO_NET_ERR; 699 } 700 701 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 702 struct iovec *iov, unsigned int iov_cnt) 703 { 704 VirtIODevice *vdev = VIRTIO_DEVICE(n); 705 uint16_t vid; 706 size_t s; 707 NetClientState *nc = qemu_get_queue(n->nic); 708 709 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 710 vid = virtio_lduw_p(vdev, &vid); 711 if (s != sizeof(vid)) { 712 return VIRTIO_NET_ERR; 713 } 714 715 if (vid >= MAX_VLAN) 716 return VIRTIO_NET_ERR; 717 718 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 719 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 720 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 721 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 722 else 723 return VIRTIO_NET_ERR; 724 725 rxfilter_notify(nc); 726 727 return VIRTIO_NET_OK; 728 } 729 730 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 731 struct iovec *iov, unsigned int iov_cnt) 732 { 733 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 734 n->status & VIRTIO_NET_S_ANNOUNCE) { 735 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 736 if (n->announce_counter) { 737 timer_mod(n->announce_timer, 738 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 739 self_announce_delay(n->announce_counter)); 740 } 741 return VIRTIO_NET_OK; 742 } else { 743 return VIRTIO_NET_ERR; 744 } 745 } 746 747 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 748 struct iovec *iov, unsigned int iov_cnt) 749 { 750 VirtIODevice *vdev = VIRTIO_DEVICE(n); 751 struct virtio_net_ctrl_mq mq; 752 size_t s; 753 uint16_t queues; 754 755 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 756 if (s != sizeof(mq)) { 757 return VIRTIO_NET_ERR; 758 } 759 760 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 761 return VIRTIO_NET_ERR; 762 } 763 764 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 765 766 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 767 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 768 queues > n->max_queues || 769 !n->multiqueue) { 770 return VIRTIO_NET_ERR; 771 } 772 773 n->curr_queues = queues; 774 /* stop the backend before changing the number of queues to avoid handling a 775 * disabled queue */ 776 virtio_net_set_status(vdev, vdev->status); 777 virtio_net_set_queues(n); 778 779 return VIRTIO_NET_OK; 780 } 781 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 782 { 783 VirtIONet *n = VIRTIO_NET(vdev); 784 struct virtio_net_ctrl_hdr ctrl; 785 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 786 VirtQueueElement elem; 787 size_t s; 788 struct iovec *iov; 789 unsigned int iov_cnt; 790 791 while (virtqueue_pop(vq, &elem)) { 792 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 793 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 794 error_report("virtio-net ctrl missing headers"); 795 exit(1); 796 } 797 798 iov = elem.out_sg; 799 iov_cnt = elem.out_num; 800 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 801 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 802 if (s != sizeof(ctrl)) { 803 status = VIRTIO_NET_ERR; 804 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 805 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 806 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 807 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 808 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 809 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 810 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 811 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 812 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 813 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 814 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 815 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 816 } 817 818 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 819 assert(s == sizeof(status)); 820 821 virtqueue_push(vq, &elem, sizeof(status)); 822 virtio_notify(vdev, vq); 823 } 824 } 825 826 /* RX */ 827 828 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 829 { 830 VirtIONet *n = VIRTIO_NET(vdev); 831 int queue_index = vq2q(virtio_get_queue_index(vq)); 832 833 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 834 } 835 836 static int virtio_net_can_receive(NetClientState *nc) 837 { 838 VirtIONet *n = qemu_get_nic_opaque(nc); 839 VirtIODevice *vdev = VIRTIO_DEVICE(n); 840 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 841 842 if (!vdev->vm_running) { 843 return 0; 844 } 845 846 if (nc->queue_index >= n->curr_queues) { 847 return 0; 848 } 849 850 if (!virtio_queue_ready(q->rx_vq) || 851 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 852 return 0; 853 } 854 855 return 1; 856 } 857 858 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 859 { 860 VirtIONet *n = q->n; 861 if (virtio_queue_empty(q->rx_vq) || 862 (n->mergeable_rx_bufs && 863 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 864 virtio_queue_set_notification(q->rx_vq, 1); 865 866 /* To avoid a race condition where the guest has made some buffers 867 * available after the above check but before notification was 868 * enabled, check for available buffers again. 869 */ 870 if (virtio_queue_empty(q->rx_vq) || 871 (n->mergeable_rx_bufs && 872 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 873 return 0; 874 } 875 } 876 877 virtio_queue_set_notification(q->rx_vq, 0); 878 return 1; 879 } 880 881 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 882 { 883 virtio_tswap16s(vdev, &hdr->hdr_len); 884 virtio_tswap16s(vdev, &hdr->gso_size); 885 virtio_tswap16s(vdev, &hdr->csum_start); 886 virtio_tswap16s(vdev, &hdr->csum_offset); 887 } 888 889 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 890 * it never finds out that the packets don't have valid checksums. This 891 * causes dhclient to get upset. Fedora's carried a patch for ages to 892 * fix this with Xen but it hasn't appeared in an upstream release of 893 * dhclient yet. 894 * 895 * To avoid breaking existing guests, we catch udp packets and add 896 * checksums. This is terrible but it's better than hacking the guest 897 * kernels. 898 * 899 * N.B. if we introduce a zero-copy API, this operation is no longer free so 900 * we should provide a mechanism to disable it to avoid polluting the host 901 * cache. 902 */ 903 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 904 uint8_t *buf, size_t size) 905 { 906 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 907 (size > 27 && size < 1500) && /* normal sized MTU */ 908 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 909 (buf[23] == 17) && /* ip.protocol == UDP */ 910 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 911 net_checksum_calculate(buf, size); 912 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 913 } 914 } 915 916 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 917 const void *buf, size_t size) 918 { 919 if (n->has_vnet_hdr) { 920 /* FIXME this cast is evil */ 921 void *wbuf = (void *)buf; 922 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 923 size - n->host_hdr_len); 924 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 925 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 926 } else { 927 struct virtio_net_hdr hdr = { 928 .flags = 0, 929 .gso_type = VIRTIO_NET_HDR_GSO_NONE 930 }; 931 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 932 } 933 } 934 935 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 936 { 937 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 938 static const uint8_t vlan[] = {0x81, 0x00}; 939 uint8_t *ptr = (uint8_t *)buf; 940 int i; 941 942 if (n->promisc) 943 return 1; 944 945 ptr += n->host_hdr_len; 946 947 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 948 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 949 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 950 return 0; 951 } 952 953 if (ptr[0] & 1) { // multicast 954 if (!memcmp(ptr, bcast, sizeof(bcast))) { 955 return !n->nobcast; 956 } else if (n->nomulti) { 957 return 0; 958 } else if (n->allmulti || n->mac_table.multi_overflow) { 959 return 1; 960 } 961 962 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 963 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 964 return 1; 965 } 966 } 967 } else { // unicast 968 if (n->nouni) { 969 return 0; 970 } else if (n->alluni || n->mac_table.uni_overflow) { 971 return 1; 972 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 973 return 1; 974 } 975 976 for (i = 0; i < n->mac_table.first_multi; i++) { 977 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 978 return 1; 979 } 980 } 981 } 982 983 return 0; 984 } 985 986 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 987 { 988 VirtIONet *n = qemu_get_nic_opaque(nc); 989 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 990 VirtIODevice *vdev = VIRTIO_DEVICE(n); 991 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 992 struct virtio_net_hdr_mrg_rxbuf mhdr; 993 unsigned mhdr_cnt = 0; 994 size_t offset, i, guest_offset; 995 996 if (!virtio_net_can_receive(nc)) { 997 return -1; 998 } 999 1000 /* hdr_len refers to the header we supply to the guest */ 1001 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1002 return 0; 1003 } 1004 1005 if (!receive_filter(n, buf, size)) 1006 return size; 1007 1008 offset = i = 0; 1009 1010 while (offset < size) { 1011 VirtQueueElement elem; 1012 int len, total; 1013 const struct iovec *sg = elem.in_sg; 1014 1015 total = 0; 1016 1017 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1018 if (i == 0) 1019 return -1; 1020 error_report("virtio-net unexpected empty queue: " 1021 "i %zd mergeable %d offset %zd, size %zd, " 1022 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 1023 i, n->mergeable_rx_bufs, offset, size, 1024 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 1025 exit(1); 1026 } 1027 1028 if (elem.in_num < 1) { 1029 error_report("virtio-net receive queue contains no in buffers"); 1030 exit(1); 1031 } 1032 1033 if (i == 0) { 1034 assert(offset == 0); 1035 if (n->mergeable_rx_bufs) { 1036 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1037 sg, elem.in_num, 1038 offsetof(typeof(mhdr), num_buffers), 1039 sizeof(mhdr.num_buffers)); 1040 } 1041 1042 receive_header(n, sg, elem.in_num, buf, size); 1043 offset = n->host_hdr_len; 1044 total += n->guest_hdr_len; 1045 guest_offset = n->guest_hdr_len; 1046 } else { 1047 guest_offset = 0; 1048 } 1049 1050 /* copy in packet. ugh */ 1051 len = iov_from_buf(sg, elem.in_num, guest_offset, 1052 buf + offset, size - offset); 1053 total += len; 1054 offset += len; 1055 /* If buffers can't be merged, at this point we 1056 * must have consumed the complete packet. 1057 * Otherwise, drop it. */ 1058 if (!n->mergeable_rx_bufs && offset < size) { 1059 #if 0 1060 error_report("virtio-net truncated non-mergeable packet: " 1061 "i %zd mergeable %d offset %zd, size %zd, " 1062 "guest hdr len %zd, host hdr len %zd", 1063 i, n->mergeable_rx_bufs, 1064 offset, size, n->guest_hdr_len, n->host_hdr_len); 1065 #endif 1066 return size; 1067 } 1068 1069 /* signal other side */ 1070 virtqueue_fill(q->rx_vq, &elem, total, i++); 1071 } 1072 1073 if (mhdr_cnt) { 1074 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1075 iov_from_buf(mhdr_sg, mhdr_cnt, 1076 0, 1077 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1078 } 1079 1080 virtqueue_flush(q->rx_vq, i); 1081 virtio_notify(vdev, q->rx_vq); 1082 1083 return size; 1084 } 1085 1086 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1087 1088 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1089 { 1090 VirtIONet *n = qemu_get_nic_opaque(nc); 1091 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1092 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1093 1094 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1095 virtio_notify(vdev, q->tx_vq); 1096 1097 q->async_tx.elem.out_num = q->async_tx.len = 0; 1098 1099 virtio_queue_set_notification(q->tx_vq, 1); 1100 virtio_net_flush_tx(q); 1101 } 1102 1103 /* TX */ 1104 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1105 { 1106 VirtIONet *n = q->n; 1107 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1108 VirtQueueElement elem; 1109 int32_t num_packets = 0; 1110 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1111 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1112 return num_packets; 1113 } 1114 1115 assert(vdev->vm_running); 1116 1117 if (q->async_tx.elem.out_num) { 1118 virtio_queue_set_notification(q->tx_vq, 0); 1119 return num_packets; 1120 } 1121 1122 while (virtqueue_pop(q->tx_vq, &elem)) { 1123 ssize_t ret, len; 1124 unsigned int out_num = elem.out_num; 1125 struct iovec *out_sg = &elem.out_sg[0]; 1126 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1127 1128 if (out_num < 1) { 1129 error_report("virtio-net header not in first element"); 1130 exit(1); 1131 } 1132 1133 if (n->has_vnet_hdr) { 1134 if (out_sg[0].iov_len < n->guest_hdr_len) { 1135 error_report("virtio-net header incorrect"); 1136 exit(1); 1137 } 1138 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); 1139 } 1140 1141 /* 1142 * If host wants to see the guest header as is, we can 1143 * pass it on unchanged. Otherwise, copy just the parts 1144 * that host is interested in. 1145 */ 1146 assert(n->host_hdr_len <= n->guest_hdr_len); 1147 if (n->host_hdr_len != n->guest_hdr_len) { 1148 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1149 out_sg, out_num, 1150 0, n->host_hdr_len); 1151 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1152 out_sg, out_num, 1153 n->guest_hdr_len, -1); 1154 out_num = sg_num; 1155 out_sg = sg; 1156 } 1157 1158 len = n->guest_hdr_len; 1159 1160 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1161 out_sg, out_num, virtio_net_tx_complete); 1162 if (ret == 0) { 1163 virtio_queue_set_notification(q->tx_vq, 0); 1164 q->async_tx.elem = elem; 1165 q->async_tx.len = len; 1166 return -EBUSY; 1167 } 1168 1169 len += ret; 1170 1171 virtqueue_push(q->tx_vq, &elem, 0); 1172 virtio_notify(vdev, q->tx_vq); 1173 1174 if (++num_packets >= n->tx_burst) { 1175 break; 1176 } 1177 } 1178 return num_packets; 1179 } 1180 1181 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1182 { 1183 VirtIONet *n = VIRTIO_NET(vdev); 1184 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1185 1186 /* This happens when device was stopped but VCPU wasn't. */ 1187 if (!vdev->vm_running) { 1188 q->tx_waiting = 1; 1189 return; 1190 } 1191 1192 if (q->tx_waiting) { 1193 virtio_queue_set_notification(vq, 1); 1194 timer_del(q->tx_timer); 1195 q->tx_waiting = 0; 1196 virtio_net_flush_tx(q); 1197 } else { 1198 timer_mod(q->tx_timer, 1199 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1200 q->tx_waiting = 1; 1201 virtio_queue_set_notification(vq, 0); 1202 } 1203 } 1204 1205 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1206 { 1207 VirtIONet *n = VIRTIO_NET(vdev); 1208 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1209 1210 if (unlikely(q->tx_waiting)) { 1211 return; 1212 } 1213 q->tx_waiting = 1; 1214 /* This happens when device was stopped but VCPU wasn't. */ 1215 if (!vdev->vm_running) { 1216 return; 1217 } 1218 virtio_queue_set_notification(vq, 0); 1219 qemu_bh_schedule(q->tx_bh); 1220 } 1221 1222 static void virtio_net_tx_timer(void *opaque) 1223 { 1224 VirtIONetQueue *q = opaque; 1225 VirtIONet *n = q->n; 1226 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1227 assert(vdev->vm_running); 1228 1229 q->tx_waiting = 0; 1230 1231 /* Just in case the driver is not ready on more */ 1232 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1233 return; 1234 } 1235 1236 virtio_queue_set_notification(q->tx_vq, 1); 1237 virtio_net_flush_tx(q); 1238 } 1239 1240 static void virtio_net_tx_bh(void *opaque) 1241 { 1242 VirtIONetQueue *q = opaque; 1243 VirtIONet *n = q->n; 1244 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1245 int32_t ret; 1246 1247 assert(vdev->vm_running); 1248 1249 q->tx_waiting = 0; 1250 1251 /* Just in case the driver is not ready on more */ 1252 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1253 return; 1254 } 1255 1256 ret = virtio_net_flush_tx(q); 1257 if (ret == -EBUSY) { 1258 return; /* Notification re-enable handled by tx_complete */ 1259 } 1260 1261 /* If we flush a full burst of packets, assume there are 1262 * more coming and immediately reschedule */ 1263 if (ret >= n->tx_burst) { 1264 qemu_bh_schedule(q->tx_bh); 1265 q->tx_waiting = 1; 1266 return; 1267 } 1268 1269 /* If less than a full burst, re-enable notification and flush 1270 * anything that may have come in while we weren't looking. If 1271 * we find something, assume the guest is still active and reschedule */ 1272 virtio_queue_set_notification(q->tx_vq, 1); 1273 if (virtio_net_flush_tx(q) > 0) { 1274 virtio_queue_set_notification(q->tx_vq, 0); 1275 qemu_bh_schedule(q->tx_bh); 1276 q->tx_waiting = 1; 1277 } 1278 } 1279 1280 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1281 { 1282 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1283 int i, max = multiqueue ? n->max_queues : 1; 1284 1285 n->multiqueue = multiqueue; 1286 1287 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1288 virtio_del_queue(vdev, i); 1289 } 1290 1291 for (i = 1; i < max; i++) { 1292 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1293 if (n->vqs[i].tx_timer) { 1294 n->vqs[i].tx_vq = 1295 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1296 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1297 virtio_net_tx_timer, 1298 &n->vqs[i]); 1299 } else { 1300 n->vqs[i].tx_vq = 1301 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1302 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1303 } 1304 1305 n->vqs[i].tx_waiting = 0; 1306 n->vqs[i].n = n; 1307 } 1308 1309 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1310 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1311 * breaking them. 1312 */ 1313 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1314 1315 virtio_net_set_queues(n); 1316 } 1317 1318 static void virtio_net_save(QEMUFile *f, void *opaque) 1319 { 1320 VirtIONet *n = opaque; 1321 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1322 1323 /* At this point, backend must be stopped, otherwise 1324 * it might keep writing to memory. */ 1325 assert(!n->vhost_started); 1326 virtio_save(vdev, f); 1327 } 1328 1329 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1330 { 1331 VirtIONet *n = VIRTIO_NET(vdev); 1332 int i; 1333 1334 qemu_put_buffer(f, n->mac, ETH_ALEN); 1335 qemu_put_be32(f, n->vqs[0].tx_waiting); 1336 qemu_put_be32(f, n->mergeable_rx_bufs); 1337 qemu_put_be16(f, n->status); 1338 qemu_put_byte(f, n->promisc); 1339 qemu_put_byte(f, n->allmulti); 1340 qemu_put_be32(f, n->mac_table.in_use); 1341 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1342 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1343 qemu_put_be32(f, n->has_vnet_hdr); 1344 qemu_put_byte(f, n->mac_table.multi_overflow); 1345 qemu_put_byte(f, n->mac_table.uni_overflow); 1346 qemu_put_byte(f, n->alluni); 1347 qemu_put_byte(f, n->nomulti); 1348 qemu_put_byte(f, n->nouni); 1349 qemu_put_byte(f, n->nobcast); 1350 qemu_put_byte(f, n->has_ufo); 1351 if (n->max_queues > 1) { 1352 qemu_put_be16(f, n->max_queues); 1353 qemu_put_be16(f, n->curr_queues); 1354 for (i = 1; i < n->curr_queues; i++) { 1355 qemu_put_be32(f, n->vqs[i].tx_waiting); 1356 } 1357 } 1358 1359 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1360 qemu_put_be64(f, n->curr_guest_offloads); 1361 } 1362 } 1363 1364 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1365 { 1366 VirtIONet *n = opaque; 1367 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1368 1369 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1370 return -EINVAL; 1371 1372 return virtio_load(vdev, f, version_id); 1373 } 1374 1375 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1376 int version_id) 1377 { 1378 VirtIONet *n = VIRTIO_NET(vdev); 1379 int i, link_down; 1380 1381 qemu_get_buffer(f, n->mac, ETH_ALEN); 1382 n->vqs[0].tx_waiting = qemu_get_be32(f); 1383 1384 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1385 1386 if (version_id >= 3) 1387 n->status = qemu_get_be16(f); 1388 1389 if (version_id >= 4) { 1390 if (version_id < 8) { 1391 n->promisc = qemu_get_be32(f); 1392 n->allmulti = qemu_get_be32(f); 1393 } else { 1394 n->promisc = qemu_get_byte(f); 1395 n->allmulti = qemu_get_byte(f); 1396 } 1397 } 1398 1399 if (version_id >= 5) { 1400 n->mac_table.in_use = qemu_get_be32(f); 1401 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1402 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1403 qemu_get_buffer(f, n->mac_table.macs, 1404 n->mac_table.in_use * ETH_ALEN); 1405 } else { 1406 int64_t i; 1407 1408 /* Overflow detected - can happen if source has a larger MAC table. 1409 * We simply set overflow flag so there's no need to maintain the 1410 * table of addresses, discard them all. 1411 * Note: 64 bit math to avoid integer overflow. 1412 */ 1413 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1414 qemu_get_byte(f); 1415 } 1416 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1417 n->mac_table.in_use = 0; 1418 } 1419 } 1420 1421 if (version_id >= 6) 1422 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1423 1424 if (version_id >= 7) { 1425 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1426 error_report("virtio-net: saved image requires vnet_hdr=on"); 1427 return -1; 1428 } 1429 } 1430 1431 if (version_id >= 9) { 1432 n->mac_table.multi_overflow = qemu_get_byte(f); 1433 n->mac_table.uni_overflow = qemu_get_byte(f); 1434 } 1435 1436 if (version_id >= 10) { 1437 n->alluni = qemu_get_byte(f); 1438 n->nomulti = qemu_get_byte(f); 1439 n->nouni = qemu_get_byte(f); 1440 n->nobcast = qemu_get_byte(f); 1441 } 1442 1443 if (version_id >= 11) { 1444 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1445 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1446 return -1; 1447 } 1448 } 1449 1450 if (n->max_queues > 1) { 1451 if (n->max_queues != qemu_get_be16(f)) { 1452 error_report("virtio-net: different max_queues "); 1453 return -1; 1454 } 1455 1456 n->curr_queues = qemu_get_be16(f); 1457 if (n->curr_queues > n->max_queues) { 1458 error_report("virtio-net: curr_queues %x > max_queues %x", 1459 n->curr_queues, n->max_queues); 1460 return -1; 1461 } 1462 for (i = 1; i < n->curr_queues; i++) { 1463 n->vqs[i].tx_waiting = qemu_get_be32(f); 1464 } 1465 } 1466 1467 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1468 n->curr_guest_offloads = qemu_get_be64(f); 1469 } else { 1470 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1471 } 1472 1473 if (peer_has_vnet_hdr(n)) { 1474 virtio_net_apply_guest_offloads(n); 1475 } 1476 1477 virtio_net_set_queues(n); 1478 1479 /* Find the first multicast entry in the saved MAC filter */ 1480 for (i = 0; i < n->mac_table.in_use; i++) { 1481 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1482 break; 1483 } 1484 } 1485 n->mac_table.first_multi = i; 1486 1487 /* nc.link_down can't be migrated, so infer link_down according 1488 * to link status bit in n->status */ 1489 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1490 for (i = 0; i < n->max_queues; i++) { 1491 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1492 } 1493 1494 if (vdev->guest_features & (0x1 << VIRTIO_NET_F_GUEST_ANNOUNCE) && 1495 vdev->guest_features & (0x1 << VIRTIO_NET_F_CTRL_VQ)) { 1496 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1497 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1498 } 1499 1500 return 0; 1501 } 1502 1503 static void virtio_net_cleanup(NetClientState *nc) 1504 { 1505 VirtIONet *n = qemu_get_nic_opaque(nc); 1506 1507 n->nic = NULL; 1508 } 1509 1510 static NetClientInfo net_virtio_info = { 1511 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1512 .size = sizeof(NICState), 1513 .can_receive = virtio_net_can_receive, 1514 .receive = virtio_net_receive, 1515 .cleanup = virtio_net_cleanup, 1516 .link_status_changed = virtio_net_set_link_status, 1517 .query_rx_filter = virtio_net_query_rxfilter, 1518 }; 1519 1520 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1521 { 1522 VirtIONet *n = VIRTIO_NET(vdev); 1523 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1524 assert(n->vhost_started); 1525 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1526 } 1527 1528 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1529 bool mask) 1530 { 1531 VirtIONet *n = VIRTIO_NET(vdev); 1532 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1533 assert(n->vhost_started); 1534 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1535 vdev, idx, mask); 1536 } 1537 1538 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1539 { 1540 int i, config_size = 0; 1541 host_features |= (1 << VIRTIO_NET_F_MAC); 1542 for (i = 0; feature_sizes[i].flags != 0; i++) { 1543 if (host_features & feature_sizes[i].flags) { 1544 config_size = MAX(feature_sizes[i].end, config_size); 1545 } 1546 } 1547 n->config_size = config_size; 1548 } 1549 1550 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1551 const char *type) 1552 { 1553 /* 1554 * The name can be NULL, the netclient name will be type.x. 1555 */ 1556 assert(type != NULL); 1557 1558 g_free(n->netclient_name); 1559 g_free(n->netclient_type); 1560 n->netclient_name = g_strdup(name); 1561 n->netclient_type = g_strdup(type); 1562 } 1563 1564 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1565 { 1566 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1567 VirtIONet *n = VIRTIO_NET(dev); 1568 NetClientState *nc; 1569 int i; 1570 1571 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1572 1573 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1574 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1575 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1576 n->curr_queues = 1; 1577 n->vqs[0].n = n; 1578 n->tx_timeout = n->net_conf.txtimer; 1579 1580 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1581 && strcmp(n->net_conf.tx, "bh")) { 1582 error_report("virtio-net: " 1583 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1584 n->net_conf.tx); 1585 error_report("Defaulting to \"bh\""); 1586 } 1587 1588 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1589 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1590 virtio_net_handle_tx_timer); 1591 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, 1592 &n->vqs[0]); 1593 } else { 1594 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1595 virtio_net_handle_tx_bh); 1596 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1597 } 1598 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1599 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1600 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1601 n->status = VIRTIO_NET_S_LINK_UP; 1602 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1603 virtio_net_announce_timer, n); 1604 1605 if (n->netclient_type) { 1606 /* 1607 * Happen when virtio_net_set_netclient_name has been called. 1608 */ 1609 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1610 n->netclient_type, n->netclient_name, n); 1611 } else { 1612 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1613 object_get_typename(OBJECT(dev)), dev->id, n); 1614 } 1615 1616 peer_test_vnet_hdr(n); 1617 if (peer_has_vnet_hdr(n)) { 1618 for (i = 0; i < n->max_queues; i++) { 1619 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1620 } 1621 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1622 } else { 1623 n->host_hdr_len = 0; 1624 } 1625 1626 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1627 1628 n->vqs[0].tx_waiting = 0; 1629 n->tx_burst = n->net_conf.txburst; 1630 virtio_net_set_mrg_rx_bufs(n, 0); 1631 n->promisc = 1; /* for compatibility */ 1632 1633 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1634 1635 n->vlans = g_malloc0(MAX_VLAN >> 3); 1636 1637 nc = qemu_get_queue(n->nic); 1638 nc->rxfilter_notify_enabled = 1; 1639 1640 n->qdev = dev; 1641 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1642 virtio_net_save, virtio_net_load, n); 1643 1644 add_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0"); 1645 } 1646 1647 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1648 { 1649 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1650 VirtIONet *n = VIRTIO_NET(dev); 1651 int i; 1652 1653 /* This will stop vhost backend if appropriate. */ 1654 virtio_net_set_status(vdev, 0); 1655 1656 unregister_savevm(dev, "virtio-net", n); 1657 1658 g_free(n->netclient_name); 1659 n->netclient_name = NULL; 1660 g_free(n->netclient_type); 1661 n->netclient_type = NULL; 1662 1663 g_free(n->mac_table.macs); 1664 g_free(n->vlans); 1665 1666 for (i = 0; i < n->max_queues; i++) { 1667 VirtIONetQueue *q = &n->vqs[i]; 1668 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1669 1670 qemu_purge_queued_packets(nc); 1671 1672 if (q->tx_timer) { 1673 timer_del(q->tx_timer); 1674 timer_free(q->tx_timer); 1675 } else if (q->tx_bh) { 1676 qemu_bh_delete(q->tx_bh); 1677 } 1678 } 1679 1680 timer_del(n->announce_timer); 1681 timer_free(n->announce_timer); 1682 g_free(n->vqs); 1683 qemu_del_nic(n->nic); 1684 virtio_cleanup(vdev); 1685 } 1686 1687 static void virtio_net_instance_init(Object *obj) 1688 { 1689 VirtIONet *n = VIRTIO_NET(obj); 1690 1691 /* 1692 * The default config_size is sizeof(struct virtio_net_config). 1693 * Can be overriden with virtio_net_set_config_size. 1694 */ 1695 n->config_size = sizeof(struct virtio_net_config); 1696 } 1697 1698 static Property virtio_net_properties[] = { 1699 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1700 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1701 TX_TIMER_INTERVAL), 1702 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1703 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1704 DEFINE_PROP_END_OF_LIST(), 1705 }; 1706 1707 static void virtio_net_class_init(ObjectClass *klass, void *data) 1708 { 1709 DeviceClass *dc = DEVICE_CLASS(klass); 1710 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1711 1712 dc->props = virtio_net_properties; 1713 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1714 vdc->realize = virtio_net_device_realize; 1715 vdc->unrealize = virtio_net_device_unrealize; 1716 vdc->get_config = virtio_net_get_config; 1717 vdc->set_config = virtio_net_set_config; 1718 vdc->get_features = virtio_net_get_features; 1719 vdc->set_features = virtio_net_set_features; 1720 vdc->bad_features = virtio_net_bad_features; 1721 vdc->reset = virtio_net_reset; 1722 vdc->set_status = virtio_net_set_status; 1723 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1724 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1725 vdc->load = virtio_net_load_device; 1726 vdc->save = virtio_net_save_device; 1727 } 1728 1729 static const TypeInfo virtio_net_info = { 1730 .name = TYPE_VIRTIO_NET, 1731 .parent = TYPE_VIRTIO_DEVICE, 1732 .instance_size = sizeof(VirtIONet), 1733 .instance_init = virtio_net_instance_init, 1734 .class_init = virtio_net_class_init, 1735 }; 1736 1737 static void virtio_register_types(void) 1738 { 1739 type_register_static(&virtio_net_info); 1740 } 1741 1742 type_init(virtio_register_types) 1743