1 /* 2 * Virtio Network Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/iov.h" 15 #include "hw/virtio/virtio.h" 16 #include "net/net.h" 17 #include "net/checksum.h" 18 #include "net/tap.h" 19 #include "qemu/error-report.h" 20 #include "qemu/timer.h" 21 #include "hw/virtio/virtio-net.h" 22 #include "net/vhost_net.h" 23 #include "hw/virtio/virtio-bus.h" 24 #include "qapi/qmp/qjson.h" 25 #include "qapi-event.h" 26 #include "hw/virtio/virtio-access.h" 27 28 #define VIRTIO_NET_VM_VERSION 11 29 30 #define MAC_TABLE_ENTRIES 64 31 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 32 33 /* 34 * Calculate the number of bytes up to and including the given 'field' of 35 * 'container'. 36 */ 37 #define endof(container, field) \ 38 (offsetof(container, field) + sizeof(((container *)0)->field)) 39 40 typedef struct VirtIOFeature { 41 uint32_t flags; 42 size_t end; 43 } VirtIOFeature; 44 45 static VirtIOFeature feature_sizes[] = { 46 {.flags = 1 << VIRTIO_NET_F_MAC, 47 .end = endof(struct virtio_net_config, mac)}, 48 {.flags = 1 << VIRTIO_NET_F_STATUS, 49 .end = endof(struct virtio_net_config, status)}, 50 {.flags = 1 << VIRTIO_NET_F_MQ, 51 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 52 {} 53 }; 54 55 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 56 { 57 VirtIONet *n = qemu_get_nic_opaque(nc); 58 59 return &n->vqs[nc->queue_index]; 60 } 61 62 static int vq2q(int queue_index) 63 { 64 return queue_index / 2; 65 } 66 67 /* TODO 68 * - we could suppress RX interrupt if we were so inclined. 69 */ 70 71 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 72 { 73 VirtIONet *n = VIRTIO_NET(vdev); 74 struct virtio_net_config netcfg; 75 76 virtio_stw_p(vdev, &netcfg.status, n->status); 77 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); 78 memcpy(netcfg.mac, n->mac, ETH_ALEN); 79 memcpy(config, &netcfg, n->config_size); 80 } 81 82 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 83 { 84 VirtIONet *n = VIRTIO_NET(vdev); 85 struct virtio_net_config netcfg = {}; 86 87 memcpy(&netcfg, config, n->config_size); 88 89 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 90 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 ((virtio_net_started(n, status) && !nc->peer->link_down) == 124 !!n->vhost_started) { 125 return; 126 } 127 if (!n->vhost_started) { 128 int r, i; 129 130 if (!vhost_net_query(get_vhost_net(nc->peer), vdev)) { 131 return; 132 } 133 134 /* Any packets outstanding? Purge them to avoid touching rings 135 * when vhost is running. 136 */ 137 for (i = 0; i < queues; i++) { 138 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 139 140 /* Purge both directions: TX and RX. */ 141 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 142 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 143 } 144 145 n->vhost_started = 1; 146 r = vhost_net_start(vdev, n->nic->ncs, queues); 147 if (r < 0) { 148 error_report("unable to start vhost net: %d: " 149 "falling back on userspace virtio", -r); 150 n->vhost_started = 0; 151 } 152 } else { 153 vhost_net_stop(vdev, n->nic->ncs, queues); 154 n->vhost_started = 0; 155 } 156 } 157 158 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 159 { 160 VirtIONet *n = VIRTIO_NET(vdev); 161 VirtIONetQueue *q; 162 int i; 163 uint8_t queue_status; 164 165 virtio_net_vhost_status(n, status); 166 167 for (i = 0; i < n->max_queues; i++) { 168 q = &n->vqs[i]; 169 170 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 171 queue_status = 0; 172 } else { 173 queue_status = status; 174 } 175 176 if (!q->tx_waiting) { 177 continue; 178 } 179 180 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 181 if (q->tx_timer) { 182 timer_mod(q->tx_timer, 183 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 184 } else { 185 qemu_bh_schedule(q->tx_bh); 186 } 187 } else { 188 if (q->tx_timer) { 189 timer_del(q->tx_timer); 190 } else { 191 qemu_bh_cancel(q->tx_bh); 192 } 193 } 194 } 195 } 196 197 static void virtio_net_set_link_status(NetClientState *nc) 198 { 199 VirtIONet *n = qemu_get_nic_opaque(nc); 200 VirtIODevice *vdev = VIRTIO_DEVICE(n); 201 uint16_t old_status = n->status; 202 203 if (nc->link_down) 204 n->status &= ~VIRTIO_NET_S_LINK_UP; 205 else 206 n->status |= VIRTIO_NET_S_LINK_UP; 207 208 if (n->status != old_status) 209 virtio_notify_config(vdev); 210 211 virtio_net_set_status(vdev, vdev->status); 212 } 213 214 static void rxfilter_notify(NetClientState *nc) 215 { 216 VirtIONet *n = qemu_get_nic_opaque(nc); 217 218 if (nc->rxfilter_notify_enabled) { 219 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 220 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, 221 n->netclient_name, path, &error_abort); 222 g_free(path); 223 224 /* disable event notification to avoid events flooding */ 225 nc->rxfilter_notify_enabled = 0; 226 } 227 } 228 229 static char *mac_strdup_printf(const uint8_t *mac) 230 { 231 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0], 232 mac[1], mac[2], mac[3], mac[4], mac[5]); 233 } 234 235 static intList *get_vlan_table(VirtIONet *n) 236 { 237 intList *list, *entry; 238 int i, j; 239 240 list = NULL; 241 for (i = 0; i < MAX_VLAN >> 5; i++) { 242 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 243 if (n->vlans[i] & (1U << j)) { 244 entry = g_malloc0(sizeof(*entry)); 245 entry->value = (i << 5) + j; 246 entry->next = list; 247 list = entry; 248 } 249 } 250 } 251 252 return list; 253 } 254 255 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 256 { 257 VirtIONet *n = qemu_get_nic_opaque(nc); 258 VirtIODevice *vdev = VIRTIO_DEVICE(n); 259 RxFilterInfo *info; 260 strList *str_list, *entry; 261 int i; 262 263 info = g_malloc0(sizeof(*info)); 264 info->name = g_strdup(nc->name); 265 info->promiscuous = n->promisc; 266 267 if (n->nouni) { 268 info->unicast = RX_STATE_NONE; 269 } else if (n->alluni) { 270 info->unicast = RX_STATE_ALL; 271 } else { 272 info->unicast = RX_STATE_NORMAL; 273 } 274 275 if (n->nomulti) { 276 info->multicast = RX_STATE_NONE; 277 } else if (n->allmulti) { 278 info->multicast = RX_STATE_ALL; 279 } else { 280 info->multicast = RX_STATE_NORMAL; 281 } 282 283 info->broadcast_allowed = n->nobcast; 284 info->multicast_overflow = n->mac_table.multi_overflow; 285 info->unicast_overflow = n->mac_table.uni_overflow; 286 287 info->main_mac = mac_strdup_printf(n->mac); 288 289 str_list = NULL; 290 for (i = 0; i < n->mac_table.first_multi; i++) { 291 entry = g_malloc0(sizeof(*entry)); 292 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 293 entry->next = str_list; 294 str_list = entry; 295 } 296 info->unicast_table = str_list; 297 298 str_list = NULL; 299 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 300 entry = g_malloc0(sizeof(*entry)); 301 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 302 entry->next = str_list; 303 str_list = entry; 304 } 305 info->multicast_table = str_list; 306 info->vlan_table = get_vlan_table(n); 307 308 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 309 info->vlan = RX_STATE_ALL; 310 } else if (!info->vlan_table) { 311 info->vlan = RX_STATE_NONE; 312 } else { 313 info->vlan = RX_STATE_NORMAL; 314 } 315 316 /* enable event notification after query */ 317 nc->rxfilter_notify_enabled = 1; 318 319 return info; 320 } 321 322 static void virtio_net_reset(VirtIODevice *vdev) 323 { 324 VirtIONet *n = VIRTIO_NET(vdev); 325 326 /* Reset back to compatibility mode */ 327 n->promisc = 1; 328 n->allmulti = 0; 329 n->alluni = 0; 330 n->nomulti = 0; 331 n->nouni = 0; 332 n->nobcast = 0; 333 /* multiqueue is disabled by default */ 334 n->curr_queues = 1; 335 timer_del(n->announce_timer); 336 n->announce_counter = 0; 337 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 338 339 /* Flush any MAC and VLAN filter table state */ 340 n->mac_table.in_use = 0; 341 n->mac_table.first_multi = 0; 342 n->mac_table.multi_overflow = 0; 343 n->mac_table.uni_overflow = 0; 344 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 345 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 346 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 347 memset(n->vlans, 0, MAX_VLAN >> 3); 348 } 349 350 static void peer_test_vnet_hdr(VirtIONet *n) 351 { 352 NetClientState *nc = qemu_get_queue(n->nic); 353 if (!nc->peer) { 354 return; 355 } 356 357 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 358 } 359 360 static int peer_has_vnet_hdr(VirtIONet *n) 361 { 362 return n->has_vnet_hdr; 363 } 364 365 static int peer_has_ufo(VirtIONet *n) 366 { 367 if (!peer_has_vnet_hdr(n)) 368 return 0; 369 370 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 371 372 return n->has_ufo; 373 } 374 375 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 376 { 377 int i; 378 NetClientState *nc; 379 380 n->mergeable_rx_bufs = mergeable_rx_bufs; 381 382 n->guest_hdr_len = n->mergeable_rx_bufs ? 383 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 384 385 for (i = 0; i < n->max_queues; i++) { 386 nc = qemu_get_subqueue(n->nic, i); 387 388 if (peer_has_vnet_hdr(n) && 389 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 390 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 391 n->host_hdr_len = n->guest_hdr_len; 392 } 393 } 394 } 395 396 static int peer_attach(VirtIONet *n, int index) 397 { 398 NetClientState *nc = qemu_get_subqueue(n->nic, index); 399 400 if (!nc->peer) { 401 return 0; 402 } 403 404 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 405 return 0; 406 } 407 408 return tap_enable(nc->peer); 409 } 410 411 static int peer_detach(VirtIONet *n, int index) 412 { 413 NetClientState *nc = qemu_get_subqueue(n->nic, index); 414 415 if (!nc->peer) { 416 return 0; 417 } 418 419 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 420 return 0; 421 } 422 423 return tap_disable(nc->peer); 424 } 425 426 static void virtio_net_set_queues(VirtIONet *n) 427 { 428 int i; 429 int r; 430 431 for (i = 0; i < n->max_queues; i++) { 432 if (i < n->curr_queues) { 433 r = peer_attach(n, i); 434 assert(!r); 435 } else { 436 r = peer_detach(n, i); 437 assert(!r); 438 } 439 } 440 } 441 442 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 443 444 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 445 { 446 VirtIONet *n = VIRTIO_NET(vdev); 447 NetClientState *nc = qemu_get_queue(n->nic); 448 449 /* Firstly sync all virtio-net possible supported features */ 450 features |= n->host_features; 451 452 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 453 454 if (!peer_has_vnet_hdr(n)) { 455 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 456 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 457 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 458 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 459 460 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 461 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 462 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 463 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 464 } 465 466 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 467 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 468 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 469 } 470 471 if (!get_vhost_net(nc->peer)) { 472 return features; 473 } 474 return vhost_net_get_features(get_vhost_net(nc->peer), features); 475 } 476 477 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 478 { 479 uint32_t features = 0; 480 481 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 482 * but also these: */ 483 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 484 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 485 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 486 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 487 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 488 489 return features; 490 } 491 492 static void virtio_net_apply_guest_offloads(VirtIONet *n) 493 { 494 qemu_set_offload(qemu_get_queue(n->nic)->peer, 495 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 496 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 497 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 498 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 499 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 500 } 501 502 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 503 { 504 static const uint64_t guest_offloads_mask = 505 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 506 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 507 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 508 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 509 (1ULL << VIRTIO_NET_F_GUEST_UFO); 510 511 return guest_offloads_mask & features; 512 } 513 514 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 515 { 516 VirtIODevice *vdev = VIRTIO_DEVICE(n); 517 return virtio_net_guest_offloads_by_features(vdev->guest_features); 518 } 519 520 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 521 { 522 VirtIONet *n = VIRTIO_NET(vdev); 523 int i; 524 525 virtio_net_set_multiqueue(n, 526 __virtio_has_feature(features, VIRTIO_NET_F_MQ)); 527 528 virtio_net_set_mrg_rx_bufs(n, 529 __virtio_has_feature(features, 530 VIRTIO_NET_F_MRG_RXBUF)); 531 532 if (n->has_vnet_hdr) { 533 n->curr_guest_offloads = 534 virtio_net_guest_offloads_by_features(features); 535 virtio_net_apply_guest_offloads(n); 536 } 537 538 for (i = 0; i < n->max_queues; i++) { 539 NetClientState *nc = qemu_get_subqueue(n->nic, i); 540 541 if (!get_vhost_net(nc->peer)) { 542 continue; 543 } 544 vhost_net_ack_features(get_vhost_net(nc->peer), features); 545 } 546 547 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 548 memset(n->vlans, 0, MAX_VLAN >> 3); 549 } else { 550 memset(n->vlans, 0xff, MAX_VLAN >> 3); 551 } 552 } 553 554 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 555 struct iovec *iov, unsigned int iov_cnt) 556 { 557 uint8_t on; 558 size_t s; 559 NetClientState *nc = qemu_get_queue(n->nic); 560 561 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 562 if (s != sizeof(on)) { 563 return VIRTIO_NET_ERR; 564 } 565 566 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 567 n->promisc = on; 568 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 569 n->allmulti = on; 570 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 571 n->alluni = on; 572 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 573 n->nomulti = on; 574 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 575 n->nouni = on; 576 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 577 n->nobcast = on; 578 } else { 579 return VIRTIO_NET_ERR; 580 } 581 582 rxfilter_notify(nc); 583 584 return VIRTIO_NET_OK; 585 } 586 587 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 588 struct iovec *iov, unsigned int iov_cnt) 589 { 590 VirtIODevice *vdev = VIRTIO_DEVICE(n); 591 uint64_t offloads; 592 size_t s; 593 594 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 595 return VIRTIO_NET_ERR; 596 } 597 598 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 599 if (s != sizeof(offloads)) { 600 return VIRTIO_NET_ERR; 601 } 602 603 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 604 uint64_t supported_offloads; 605 606 if (!n->has_vnet_hdr) { 607 return VIRTIO_NET_ERR; 608 } 609 610 supported_offloads = virtio_net_supported_guest_offloads(n); 611 if (offloads & ~supported_offloads) { 612 return VIRTIO_NET_ERR; 613 } 614 615 n->curr_guest_offloads = offloads; 616 virtio_net_apply_guest_offloads(n); 617 618 return VIRTIO_NET_OK; 619 } else { 620 return VIRTIO_NET_ERR; 621 } 622 } 623 624 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 625 struct iovec *iov, unsigned int iov_cnt) 626 { 627 VirtIODevice *vdev = VIRTIO_DEVICE(n); 628 struct virtio_net_ctrl_mac mac_data; 629 size_t s; 630 NetClientState *nc = qemu_get_queue(n->nic); 631 632 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 633 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 634 return VIRTIO_NET_ERR; 635 } 636 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 637 assert(s == sizeof(n->mac)); 638 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 639 rxfilter_notify(nc); 640 641 return VIRTIO_NET_OK; 642 } 643 644 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 645 return VIRTIO_NET_ERR; 646 } 647 648 int in_use = 0; 649 int first_multi = 0; 650 uint8_t uni_overflow = 0; 651 uint8_t multi_overflow = 0; 652 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 653 654 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 655 sizeof(mac_data.entries)); 656 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 657 if (s != sizeof(mac_data.entries)) { 658 goto error; 659 } 660 iov_discard_front(&iov, &iov_cnt, s); 661 662 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 663 goto error; 664 } 665 666 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 667 s = iov_to_buf(iov, iov_cnt, 0, macs, 668 mac_data.entries * ETH_ALEN); 669 if (s != mac_data.entries * ETH_ALEN) { 670 goto error; 671 } 672 in_use += mac_data.entries; 673 } else { 674 uni_overflow = 1; 675 } 676 677 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 678 679 first_multi = in_use; 680 681 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 682 sizeof(mac_data.entries)); 683 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 684 if (s != sizeof(mac_data.entries)) { 685 goto error; 686 } 687 688 iov_discard_front(&iov, &iov_cnt, s); 689 690 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 691 goto error; 692 } 693 694 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 695 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 696 mac_data.entries * ETH_ALEN); 697 if (s != mac_data.entries * ETH_ALEN) { 698 goto error; 699 } 700 in_use += mac_data.entries; 701 } else { 702 multi_overflow = 1; 703 } 704 705 n->mac_table.in_use = in_use; 706 n->mac_table.first_multi = first_multi; 707 n->mac_table.uni_overflow = uni_overflow; 708 n->mac_table.multi_overflow = multi_overflow; 709 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 710 g_free(macs); 711 rxfilter_notify(nc); 712 713 return VIRTIO_NET_OK; 714 715 error: 716 g_free(macs); 717 return VIRTIO_NET_ERR; 718 } 719 720 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 721 struct iovec *iov, unsigned int iov_cnt) 722 { 723 VirtIODevice *vdev = VIRTIO_DEVICE(n); 724 uint16_t vid; 725 size_t s; 726 NetClientState *nc = qemu_get_queue(n->nic); 727 728 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 729 vid = virtio_lduw_p(vdev, &vid); 730 if (s != sizeof(vid)) { 731 return VIRTIO_NET_ERR; 732 } 733 734 if (vid >= MAX_VLAN) 735 return VIRTIO_NET_ERR; 736 737 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 738 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 739 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 740 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 741 else 742 return VIRTIO_NET_ERR; 743 744 rxfilter_notify(nc); 745 746 return VIRTIO_NET_OK; 747 } 748 749 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 750 struct iovec *iov, unsigned int iov_cnt) 751 { 752 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 753 n->status & VIRTIO_NET_S_ANNOUNCE) { 754 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 755 if (n->announce_counter) { 756 timer_mod(n->announce_timer, 757 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 758 self_announce_delay(n->announce_counter)); 759 } 760 return VIRTIO_NET_OK; 761 } else { 762 return VIRTIO_NET_ERR; 763 } 764 } 765 766 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 767 struct iovec *iov, unsigned int iov_cnt) 768 { 769 VirtIODevice *vdev = VIRTIO_DEVICE(n); 770 struct virtio_net_ctrl_mq mq; 771 size_t s; 772 uint16_t queues; 773 774 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 775 if (s != sizeof(mq)) { 776 return VIRTIO_NET_ERR; 777 } 778 779 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 780 return VIRTIO_NET_ERR; 781 } 782 783 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 784 785 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 786 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 787 queues > n->max_queues || 788 !n->multiqueue) { 789 return VIRTIO_NET_ERR; 790 } 791 792 n->curr_queues = queues; 793 /* stop the backend before changing the number of queues to avoid handling a 794 * disabled queue */ 795 virtio_net_set_status(vdev, vdev->status); 796 virtio_net_set_queues(n); 797 798 return VIRTIO_NET_OK; 799 } 800 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 801 { 802 VirtIONet *n = VIRTIO_NET(vdev); 803 struct virtio_net_ctrl_hdr ctrl; 804 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 805 VirtQueueElement elem; 806 size_t s; 807 struct iovec *iov, *iov2; 808 unsigned int iov_cnt; 809 810 while (virtqueue_pop(vq, &elem)) { 811 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 812 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 813 error_report("virtio-net ctrl missing headers"); 814 exit(1); 815 } 816 817 iov_cnt = elem.out_num; 818 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num); 819 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 820 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 821 if (s != sizeof(ctrl)) { 822 status = VIRTIO_NET_ERR; 823 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 824 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 825 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 826 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 827 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 828 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 829 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 830 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 831 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 832 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 833 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 834 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 835 } 836 837 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 838 assert(s == sizeof(status)); 839 840 virtqueue_push(vq, &elem, sizeof(status)); 841 virtio_notify(vdev, vq); 842 g_free(iov2); 843 } 844 } 845 846 /* RX */ 847 848 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 849 { 850 VirtIONet *n = VIRTIO_NET(vdev); 851 int queue_index = vq2q(virtio_get_queue_index(vq)); 852 853 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 854 } 855 856 static int virtio_net_can_receive(NetClientState *nc) 857 { 858 VirtIONet *n = qemu_get_nic_opaque(nc); 859 VirtIODevice *vdev = VIRTIO_DEVICE(n); 860 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 861 862 if (!vdev->vm_running) { 863 return 0; 864 } 865 866 if (nc->queue_index >= n->curr_queues) { 867 return 0; 868 } 869 870 if (!virtio_queue_ready(q->rx_vq) || 871 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 872 return 0; 873 } 874 875 return 1; 876 } 877 878 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 879 { 880 VirtIONet *n = q->n; 881 if (virtio_queue_empty(q->rx_vq) || 882 (n->mergeable_rx_bufs && 883 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 884 virtio_queue_set_notification(q->rx_vq, 1); 885 886 /* To avoid a race condition where the guest has made some buffers 887 * available after the above check but before notification was 888 * enabled, check for available buffers again. 889 */ 890 if (virtio_queue_empty(q->rx_vq) || 891 (n->mergeable_rx_bufs && 892 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 893 return 0; 894 } 895 } 896 897 virtio_queue_set_notification(q->rx_vq, 0); 898 return 1; 899 } 900 901 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 902 { 903 virtio_tswap16s(vdev, &hdr->hdr_len); 904 virtio_tswap16s(vdev, &hdr->gso_size); 905 virtio_tswap16s(vdev, &hdr->csum_start); 906 virtio_tswap16s(vdev, &hdr->csum_offset); 907 } 908 909 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 910 * it never finds out that the packets don't have valid checksums. This 911 * causes dhclient to get upset. Fedora's carried a patch for ages to 912 * fix this with Xen but it hasn't appeared in an upstream release of 913 * dhclient yet. 914 * 915 * To avoid breaking existing guests, we catch udp packets and add 916 * checksums. This is terrible but it's better than hacking the guest 917 * kernels. 918 * 919 * N.B. if we introduce a zero-copy API, this operation is no longer free so 920 * we should provide a mechanism to disable it to avoid polluting the host 921 * cache. 922 */ 923 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 924 uint8_t *buf, size_t size) 925 { 926 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 927 (size > 27 && size < 1500) && /* normal sized MTU */ 928 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 929 (buf[23] == 17) && /* ip.protocol == UDP */ 930 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 931 net_checksum_calculate(buf, size); 932 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 933 } 934 } 935 936 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 937 const void *buf, size_t size) 938 { 939 if (n->has_vnet_hdr) { 940 /* FIXME this cast is evil */ 941 void *wbuf = (void *)buf; 942 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 943 size - n->host_hdr_len); 944 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 945 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 946 } else { 947 struct virtio_net_hdr hdr = { 948 .flags = 0, 949 .gso_type = VIRTIO_NET_HDR_GSO_NONE 950 }; 951 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 952 } 953 } 954 955 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 956 { 957 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 958 static const uint8_t vlan[] = {0x81, 0x00}; 959 uint8_t *ptr = (uint8_t *)buf; 960 int i; 961 962 if (n->promisc) 963 return 1; 964 965 ptr += n->host_hdr_len; 966 967 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 968 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 969 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 970 return 0; 971 } 972 973 if (ptr[0] & 1) { // multicast 974 if (!memcmp(ptr, bcast, sizeof(bcast))) { 975 return !n->nobcast; 976 } else if (n->nomulti) { 977 return 0; 978 } else if (n->allmulti || n->mac_table.multi_overflow) { 979 return 1; 980 } 981 982 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 983 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 984 return 1; 985 } 986 } 987 } else { // unicast 988 if (n->nouni) { 989 return 0; 990 } else if (n->alluni || n->mac_table.uni_overflow) { 991 return 1; 992 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 993 return 1; 994 } 995 996 for (i = 0; i < n->mac_table.first_multi; i++) { 997 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 998 return 1; 999 } 1000 } 1001 } 1002 1003 return 0; 1004 } 1005 1006 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 1007 { 1008 VirtIONet *n = qemu_get_nic_opaque(nc); 1009 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1010 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1011 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1012 struct virtio_net_hdr_mrg_rxbuf mhdr; 1013 unsigned mhdr_cnt = 0; 1014 size_t offset, i, guest_offset; 1015 1016 if (!virtio_net_can_receive(nc)) { 1017 return -1; 1018 } 1019 1020 /* hdr_len refers to the header we supply to the guest */ 1021 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1022 return 0; 1023 } 1024 1025 if (!receive_filter(n, buf, size)) 1026 return size; 1027 1028 offset = i = 0; 1029 1030 while (offset < size) { 1031 VirtQueueElement elem; 1032 int len, total; 1033 const struct iovec *sg = elem.in_sg; 1034 1035 total = 0; 1036 1037 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1038 if (i == 0) 1039 return -1; 1040 error_report("virtio-net unexpected empty queue: " 1041 "i %zd mergeable %d offset %zd, size %zd, " 1042 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 1043 i, n->mergeable_rx_bufs, offset, size, 1044 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 1045 exit(1); 1046 } 1047 1048 if (elem.in_num < 1) { 1049 error_report("virtio-net receive queue contains no in buffers"); 1050 exit(1); 1051 } 1052 1053 if (i == 0) { 1054 assert(offset == 0); 1055 if (n->mergeable_rx_bufs) { 1056 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1057 sg, elem.in_num, 1058 offsetof(typeof(mhdr), num_buffers), 1059 sizeof(mhdr.num_buffers)); 1060 } 1061 1062 receive_header(n, sg, elem.in_num, buf, size); 1063 offset = n->host_hdr_len; 1064 total += n->guest_hdr_len; 1065 guest_offset = n->guest_hdr_len; 1066 } else { 1067 guest_offset = 0; 1068 } 1069 1070 /* copy in packet. ugh */ 1071 len = iov_from_buf(sg, elem.in_num, guest_offset, 1072 buf + offset, size - offset); 1073 total += len; 1074 offset += len; 1075 /* If buffers can't be merged, at this point we 1076 * must have consumed the complete packet. 1077 * Otherwise, drop it. */ 1078 if (!n->mergeable_rx_bufs && offset < size) { 1079 #if 0 1080 error_report("virtio-net truncated non-mergeable packet: " 1081 "i %zd mergeable %d offset %zd, size %zd, " 1082 "guest hdr len %zd, host hdr len %zd", 1083 i, n->mergeable_rx_bufs, 1084 offset, size, n->guest_hdr_len, n->host_hdr_len); 1085 #endif 1086 return size; 1087 } 1088 1089 /* signal other side */ 1090 virtqueue_fill(q->rx_vq, &elem, total, i++); 1091 } 1092 1093 if (mhdr_cnt) { 1094 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1095 iov_from_buf(mhdr_sg, mhdr_cnt, 1096 0, 1097 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1098 } 1099 1100 virtqueue_flush(q->rx_vq, i); 1101 virtio_notify(vdev, q->rx_vq); 1102 1103 return size; 1104 } 1105 1106 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1107 1108 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1109 { 1110 VirtIONet *n = qemu_get_nic_opaque(nc); 1111 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1112 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1113 1114 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1115 virtio_notify(vdev, q->tx_vq); 1116 1117 q->async_tx.elem.out_num = q->async_tx.len = 0; 1118 1119 virtio_queue_set_notification(q->tx_vq, 1); 1120 virtio_net_flush_tx(q); 1121 } 1122 1123 /* TX */ 1124 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1125 { 1126 VirtIONet *n = q->n; 1127 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1128 VirtQueueElement elem; 1129 int32_t num_packets = 0; 1130 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1131 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1132 return num_packets; 1133 } 1134 1135 if (q->async_tx.elem.out_num) { 1136 virtio_queue_set_notification(q->tx_vq, 0); 1137 return num_packets; 1138 } 1139 1140 while (virtqueue_pop(q->tx_vq, &elem)) { 1141 ssize_t ret, len; 1142 unsigned int out_num = elem.out_num; 1143 struct iovec *out_sg = &elem.out_sg[0]; 1144 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1145 1146 if (out_num < 1) { 1147 error_report("virtio-net header not in first element"); 1148 exit(1); 1149 } 1150 1151 if (n->has_vnet_hdr) { 1152 if (out_sg[0].iov_len < n->guest_hdr_len) { 1153 error_report("virtio-net header incorrect"); 1154 exit(1); 1155 } 1156 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); 1157 } 1158 1159 /* 1160 * If host wants to see the guest header as is, we can 1161 * pass it on unchanged. Otherwise, copy just the parts 1162 * that host is interested in. 1163 */ 1164 assert(n->host_hdr_len <= n->guest_hdr_len); 1165 if (n->host_hdr_len != n->guest_hdr_len) { 1166 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1167 out_sg, out_num, 1168 0, n->host_hdr_len); 1169 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1170 out_sg, out_num, 1171 n->guest_hdr_len, -1); 1172 out_num = sg_num; 1173 out_sg = sg; 1174 } 1175 1176 len = n->guest_hdr_len; 1177 1178 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1179 out_sg, out_num, virtio_net_tx_complete); 1180 if (ret == 0) { 1181 virtio_queue_set_notification(q->tx_vq, 0); 1182 q->async_tx.elem = elem; 1183 q->async_tx.len = len; 1184 return -EBUSY; 1185 } 1186 1187 len += ret; 1188 1189 virtqueue_push(q->tx_vq, &elem, 0); 1190 virtio_notify(vdev, q->tx_vq); 1191 1192 if (++num_packets >= n->tx_burst) { 1193 break; 1194 } 1195 } 1196 return num_packets; 1197 } 1198 1199 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1200 { 1201 VirtIONet *n = VIRTIO_NET(vdev); 1202 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1203 1204 /* This happens when device was stopped but VCPU wasn't. */ 1205 if (!vdev->vm_running) { 1206 q->tx_waiting = 1; 1207 return; 1208 } 1209 1210 if (q->tx_waiting) { 1211 virtio_queue_set_notification(vq, 1); 1212 timer_del(q->tx_timer); 1213 q->tx_waiting = 0; 1214 virtio_net_flush_tx(q); 1215 } else { 1216 timer_mod(q->tx_timer, 1217 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1218 q->tx_waiting = 1; 1219 virtio_queue_set_notification(vq, 0); 1220 } 1221 } 1222 1223 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1224 { 1225 VirtIONet *n = VIRTIO_NET(vdev); 1226 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1227 1228 if (unlikely(q->tx_waiting)) { 1229 return; 1230 } 1231 q->tx_waiting = 1; 1232 /* This happens when device was stopped but VCPU wasn't. */ 1233 if (!vdev->vm_running) { 1234 return; 1235 } 1236 virtio_queue_set_notification(vq, 0); 1237 qemu_bh_schedule(q->tx_bh); 1238 } 1239 1240 static void virtio_net_tx_timer(void *opaque) 1241 { 1242 VirtIONetQueue *q = opaque; 1243 VirtIONet *n = q->n; 1244 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1245 /* This happens when device was stopped but BH wasn't. */ 1246 if (!vdev->vm_running) { 1247 /* Make sure tx waiting is set, so we'll run when restarted. */ 1248 assert(q->tx_waiting); 1249 return; 1250 } 1251 1252 q->tx_waiting = 0; 1253 1254 /* Just in case the driver is not ready on more */ 1255 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1256 return; 1257 } 1258 1259 virtio_queue_set_notification(q->tx_vq, 1); 1260 virtio_net_flush_tx(q); 1261 } 1262 1263 static void virtio_net_tx_bh(void *opaque) 1264 { 1265 VirtIONetQueue *q = opaque; 1266 VirtIONet *n = q->n; 1267 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1268 int32_t ret; 1269 1270 /* This happens when device was stopped but BH wasn't. */ 1271 if (!vdev->vm_running) { 1272 /* Make sure tx waiting is set, so we'll run when restarted. */ 1273 assert(q->tx_waiting); 1274 return; 1275 } 1276 1277 q->tx_waiting = 0; 1278 1279 /* Just in case the driver is not ready on more */ 1280 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1281 return; 1282 } 1283 1284 ret = virtio_net_flush_tx(q); 1285 if (ret == -EBUSY) { 1286 return; /* Notification re-enable handled by tx_complete */ 1287 } 1288 1289 /* If we flush a full burst of packets, assume there are 1290 * more coming and immediately reschedule */ 1291 if (ret >= n->tx_burst) { 1292 qemu_bh_schedule(q->tx_bh); 1293 q->tx_waiting = 1; 1294 return; 1295 } 1296 1297 /* If less than a full burst, re-enable notification and flush 1298 * anything that may have come in while we weren't looking. If 1299 * we find something, assume the guest is still active and reschedule */ 1300 virtio_queue_set_notification(q->tx_vq, 1); 1301 if (virtio_net_flush_tx(q) > 0) { 1302 virtio_queue_set_notification(q->tx_vq, 0); 1303 qemu_bh_schedule(q->tx_bh); 1304 q->tx_waiting = 1; 1305 } 1306 } 1307 1308 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1309 { 1310 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1311 int i, max = multiqueue ? n->max_queues : 1; 1312 1313 n->multiqueue = multiqueue; 1314 1315 for (i = 2; i < n->max_queues * 2 + 1; i++) { 1316 virtio_del_queue(vdev, i); 1317 } 1318 1319 for (i = 1; i < max; i++) { 1320 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1321 if (n->vqs[i].tx_timer) { 1322 n->vqs[i].tx_vq = 1323 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1324 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1325 virtio_net_tx_timer, 1326 &n->vqs[i]); 1327 } else { 1328 n->vqs[i].tx_vq = 1329 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1330 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1331 } 1332 1333 n->vqs[i].tx_waiting = 0; 1334 n->vqs[i].n = n; 1335 } 1336 1337 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1338 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1339 * breaking them. 1340 */ 1341 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1342 1343 virtio_net_set_queues(n); 1344 } 1345 1346 static void virtio_net_save(QEMUFile *f, void *opaque) 1347 { 1348 VirtIONet *n = opaque; 1349 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1350 1351 /* At this point, backend must be stopped, otherwise 1352 * it might keep writing to memory. */ 1353 assert(!n->vhost_started); 1354 virtio_save(vdev, f); 1355 } 1356 1357 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1358 { 1359 VirtIONet *n = VIRTIO_NET(vdev); 1360 int i; 1361 1362 qemu_put_buffer(f, n->mac, ETH_ALEN); 1363 qemu_put_be32(f, n->vqs[0].tx_waiting); 1364 qemu_put_be32(f, n->mergeable_rx_bufs); 1365 qemu_put_be16(f, n->status); 1366 qemu_put_byte(f, n->promisc); 1367 qemu_put_byte(f, n->allmulti); 1368 qemu_put_be32(f, n->mac_table.in_use); 1369 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1370 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1371 qemu_put_be32(f, n->has_vnet_hdr); 1372 qemu_put_byte(f, n->mac_table.multi_overflow); 1373 qemu_put_byte(f, n->mac_table.uni_overflow); 1374 qemu_put_byte(f, n->alluni); 1375 qemu_put_byte(f, n->nomulti); 1376 qemu_put_byte(f, n->nouni); 1377 qemu_put_byte(f, n->nobcast); 1378 qemu_put_byte(f, n->has_ufo); 1379 if (n->max_queues > 1) { 1380 qemu_put_be16(f, n->max_queues); 1381 qemu_put_be16(f, n->curr_queues); 1382 for (i = 1; i < n->curr_queues; i++) { 1383 qemu_put_be32(f, n->vqs[i].tx_waiting); 1384 } 1385 } 1386 1387 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1388 qemu_put_be64(f, n->curr_guest_offloads); 1389 } 1390 } 1391 1392 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1393 { 1394 VirtIONet *n = opaque; 1395 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1396 1397 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1398 return -EINVAL; 1399 1400 return virtio_load(vdev, f, version_id); 1401 } 1402 1403 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1404 int version_id) 1405 { 1406 VirtIONet *n = VIRTIO_NET(vdev); 1407 int i, link_down; 1408 1409 qemu_get_buffer(f, n->mac, ETH_ALEN); 1410 n->vqs[0].tx_waiting = qemu_get_be32(f); 1411 1412 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1413 1414 if (version_id >= 3) 1415 n->status = qemu_get_be16(f); 1416 1417 if (version_id >= 4) { 1418 if (version_id < 8) { 1419 n->promisc = qemu_get_be32(f); 1420 n->allmulti = qemu_get_be32(f); 1421 } else { 1422 n->promisc = qemu_get_byte(f); 1423 n->allmulti = qemu_get_byte(f); 1424 } 1425 } 1426 1427 if (version_id >= 5) { 1428 n->mac_table.in_use = qemu_get_be32(f); 1429 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1430 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1431 qemu_get_buffer(f, n->mac_table.macs, 1432 n->mac_table.in_use * ETH_ALEN); 1433 } else { 1434 int64_t i; 1435 1436 /* Overflow detected - can happen if source has a larger MAC table. 1437 * We simply set overflow flag so there's no need to maintain the 1438 * table of addresses, discard them all. 1439 * Note: 64 bit math to avoid integer overflow. 1440 */ 1441 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1442 qemu_get_byte(f); 1443 } 1444 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1445 n->mac_table.in_use = 0; 1446 } 1447 } 1448 1449 if (version_id >= 6) 1450 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1451 1452 if (version_id >= 7) { 1453 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1454 error_report("virtio-net: saved image requires vnet_hdr=on"); 1455 return -1; 1456 } 1457 } 1458 1459 if (version_id >= 9) { 1460 n->mac_table.multi_overflow = qemu_get_byte(f); 1461 n->mac_table.uni_overflow = qemu_get_byte(f); 1462 } 1463 1464 if (version_id >= 10) { 1465 n->alluni = qemu_get_byte(f); 1466 n->nomulti = qemu_get_byte(f); 1467 n->nouni = qemu_get_byte(f); 1468 n->nobcast = qemu_get_byte(f); 1469 } 1470 1471 if (version_id >= 11) { 1472 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1473 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1474 return -1; 1475 } 1476 } 1477 1478 if (n->max_queues > 1) { 1479 if (n->max_queues != qemu_get_be16(f)) { 1480 error_report("virtio-net: different max_queues "); 1481 return -1; 1482 } 1483 1484 n->curr_queues = qemu_get_be16(f); 1485 if (n->curr_queues > n->max_queues) { 1486 error_report("virtio-net: curr_queues %x > max_queues %x", 1487 n->curr_queues, n->max_queues); 1488 return -1; 1489 } 1490 for (i = 1; i < n->curr_queues; i++) { 1491 n->vqs[i].tx_waiting = qemu_get_be32(f); 1492 } 1493 } 1494 1495 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1496 n->curr_guest_offloads = qemu_get_be64(f); 1497 } else { 1498 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1499 } 1500 1501 if (peer_has_vnet_hdr(n)) { 1502 virtio_net_apply_guest_offloads(n); 1503 } 1504 1505 virtio_net_set_queues(n); 1506 1507 /* Find the first multicast entry in the saved MAC filter */ 1508 for (i = 0; i < n->mac_table.in_use; i++) { 1509 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1510 break; 1511 } 1512 } 1513 n->mac_table.first_multi = i; 1514 1515 /* nc.link_down can't be migrated, so infer link_down according 1516 * to link status bit in n->status */ 1517 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1518 for (i = 0; i < n->max_queues; i++) { 1519 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1520 } 1521 1522 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1523 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1524 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1525 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1526 } 1527 1528 return 0; 1529 } 1530 1531 static NetClientInfo net_virtio_info = { 1532 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1533 .size = sizeof(NICState), 1534 .can_receive = virtio_net_can_receive, 1535 .receive = virtio_net_receive, 1536 .link_status_changed = virtio_net_set_link_status, 1537 .query_rx_filter = virtio_net_query_rxfilter, 1538 }; 1539 1540 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1541 { 1542 VirtIONet *n = VIRTIO_NET(vdev); 1543 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1544 assert(n->vhost_started); 1545 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1546 } 1547 1548 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1549 bool mask) 1550 { 1551 VirtIONet *n = VIRTIO_NET(vdev); 1552 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1553 assert(n->vhost_started); 1554 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1555 vdev, idx, mask); 1556 } 1557 1558 static void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1559 { 1560 int i, config_size = 0; 1561 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1562 for (i = 0; feature_sizes[i].flags != 0; i++) { 1563 if (host_features & feature_sizes[i].flags) { 1564 config_size = MAX(feature_sizes[i].end, config_size); 1565 } 1566 } 1567 n->config_size = config_size; 1568 } 1569 1570 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1571 const char *type) 1572 { 1573 /* 1574 * The name can be NULL, the netclient name will be type.x. 1575 */ 1576 assert(type != NULL); 1577 1578 g_free(n->netclient_name); 1579 g_free(n->netclient_type); 1580 n->netclient_name = g_strdup(name); 1581 n->netclient_type = g_strdup(type); 1582 } 1583 1584 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1585 { 1586 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1587 VirtIONet *n = VIRTIO_NET(dev); 1588 NetClientState *nc; 1589 int i; 1590 1591 virtio_net_set_config_size(n, n->host_features); 1592 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1593 1594 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1595 if (n->max_queues * 2 + 1 > VIRTIO_PCI_QUEUE_MAX) { 1596 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1597 "must be a postive integer less than %d.", 1598 n->max_queues, (VIRTIO_PCI_QUEUE_MAX - 1) / 2); 1599 virtio_cleanup(vdev); 1600 return; 1601 } 1602 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1603 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1604 n->curr_queues = 1; 1605 n->vqs[0].n = n; 1606 n->tx_timeout = n->net_conf.txtimer; 1607 1608 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1609 && strcmp(n->net_conf.tx, "bh")) { 1610 error_report("virtio-net: " 1611 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1612 n->net_conf.tx); 1613 error_report("Defaulting to \"bh\""); 1614 } 1615 1616 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1617 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1618 virtio_net_handle_tx_timer); 1619 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, 1620 &n->vqs[0]); 1621 } else { 1622 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1623 virtio_net_handle_tx_bh); 1624 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1625 } 1626 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1627 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1628 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1629 n->status = VIRTIO_NET_S_LINK_UP; 1630 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1631 virtio_net_announce_timer, n); 1632 1633 if (n->netclient_type) { 1634 /* 1635 * Happen when virtio_net_set_netclient_name has been called. 1636 */ 1637 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1638 n->netclient_type, n->netclient_name, n); 1639 } else { 1640 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1641 object_get_typename(OBJECT(dev)), dev->id, n); 1642 } 1643 1644 peer_test_vnet_hdr(n); 1645 if (peer_has_vnet_hdr(n)) { 1646 for (i = 0; i < n->max_queues; i++) { 1647 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1648 } 1649 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1650 } else { 1651 n->host_hdr_len = 0; 1652 } 1653 1654 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1655 1656 n->vqs[0].tx_waiting = 0; 1657 n->tx_burst = n->net_conf.txburst; 1658 virtio_net_set_mrg_rx_bufs(n, 0); 1659 n->promisc = 1; /* for compatibility */ 1660 1661 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1662 1663 n->vlans = g_malloc0(MAX_VLAN >> 3); 1664 1665 nc = qemu_get_queue(n->nic); 1666 nc->rxfilter_notify_enabled = 1; 1667 1668 n->qdev = dev; 1669 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1670 virtio_net_save, virtio_net_load, n); 1671 } 1672 1673 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1674 { 1675 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1676 VirtIONet *n = VIRTIO_NET(dev); 1677 int i; 1678 1679 /* This will stop vhost backend if appropriate. */ 1680 virtio_net_set_status(vdev, 0); 1681 1682 unregister_savevm(dev, "virtio-net", n); 1683 1684 g_free(n->netclient_name); 1685 n->netclient_name = NULL; 1686 g_free(n->netclient_type); 1687 n->netclient_type = NULL; 1688 1689 g_free(n->mac_table.macs); 1690 g_free(n->vlans); 1691 1692 for (i = 0; i < n->max_queues; i++) { 1693 VirtIONetQueue *q = &n->vqs[i]; 1694 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1695 1696 qemu_purge_queued_packets(nc); 1697 1698 if (q->tx_timer) { 1699 timer_del(q->tx_timer); 1700 timer_free(q->tx_timer); 1701 } else if (q->tx_bh) { 1702 qemu_bh_delete(q->tx_bh); 1703 } 1704 } 1705 1706 timer_del(n->announce_timer); 1707 timer_free(n->announce_timer); 1708 g_free(n->vqs); 1709 qemu_del_nic(n->nic); 1710 virtio_cleanup(vdev); 1711 } 1712 1713 static void virtio_net_instance_init(Object *obj) 1714 { 1715 VirtIONet *n = VIRTIO_NET(obj); 1716 1717 /* 1718 * The default config_size is sizeof(struct virtio_net_config). 1719 * Can be overriden with virtio_net_set_config_size. 1720 */ 1721 n->config_size = sizeof(struct virtio_net_config); 1722 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 1723 "bootindex", "/ethernet-phy@0", 1724 DEVICE(n), NULL); 1725 } 1726 1727 static Property virtio_net_properties[] = { 1728 DEFINE_VIRTIO_NET_FEATURES(VirtIONet, host_features), 1729 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1730 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1731 TX_TIMER_INTERVAL), 1732 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1733 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1734 DEFINE_PROP_END_OF_LIST(), 1735 }; 1736 1737 static void virtio_net_class_init(ObjectClass *klass, void *data) 1738 { 1739 DeviceClass *dc = DEVICE_CLASS(klass); 1740 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1741 1742 dc->props = virtio_net_properties; 1743 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1744 vdc->realize = virtio_net_device_realize; 1745 vdc->unrealize = virtio_net_device_unrealize; 1746 vdc->get_config = virtio_net_get_config; 1747 vdc->set_config = virtio_net_set_config; 1748 vdc->get_features = virtio_net_get_features; 1749 vdc->set_features = virtio_net_set_features; 1750 vdc->bad_features = virtio_net_bad_features; 1751 vdc->reset = virtio_net_reset; 1752 vdc->set_status = virtio_net_set_status; 1753 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1754 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1755 vdc->load = virtio_net_load_device; 1756 vdc->save = virtio_net_save_device; 1757 } 1758 1759 static const TypeInfo virtio_net_info = { 1760 .name = TYPE_VIRTIO_NET, 1761 .parent = TYPE_VIRTIO_DEVICE, 1762 .instance_size = sizeof(VirtIONet), 1763 .instance_init = virtio_net_instance_init, 1764 .class_init = virtio_net_class_init, 1765 }; 1766 1767 static void virtio_register_types(void) 1768 { 1769 type_register_static(&virtio_net_info); 1770 } 1771 1772 type_init(virtio_register_types) 1773