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 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 450 451 if (!peer_has_vnet_hdr(n)) { 452 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 453 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 454 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 455 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 456 457 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 458 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 459 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 460 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 461 } 462 463 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 464 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 465 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 466 } 467 468 if (!get_vhost_net(nc->peer)) { 469 return features; 470 } 471 return vhost_net_get_features(get_vhost_net(nc->peer), features); 472 } 473 474 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 475 { 476 uint32_t features = 0; 477 478 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 479 * but also these: */ 480 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 481 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 482 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 483 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 484 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 485 486 return features; 487 } 488 489 static void virtio_net_apply_guest_offloads(VirtIONet *n) 490 { 491 qemu_set_offload(qemu_get_queue(n->nic)->peer, 492 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 493 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 494 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 495 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 496 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 497 } 498 499 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 500 { 501 static const uint64_t guest_offloads_mask = 502 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 503 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 504 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 505 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 506 (1ULL << VIRTIO_NET_F_GUEST_UFO); 507 508 return guest_offloads_mask & features; 509 } 510 511 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 512 { 513 VirtIODevice *vdev = VIRTIO_DEVICE(n); 514 return virtio_net_guest_offloads_by_features(vdev->guest_features); 515 } 516 517 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 518 { 519 VirtIONet *n = VIRTIO_NET(vdev); 520 int i; 521 522 virtio_net_set_multiqueue(n, 523 __virtio_has_feature(features, VIRTIO_NET_F_MQ)); 524 525 virtio_net_set_mrg_rx_bufs(n, 526 __virtio_has_feature(features, 527 VIRTIO_NET_F_MRG_RXBUF)); 528 529 if (n->has_vnet_hdr) { 530 n->curr_guest_offloads = 531 virtio_net_guest_offloads_by_features(features); 532 virtio_net_apply_guest_offloads(n); 533 } 534 535 for (i = 0; i < n->max_queues; i++) { 536 NetClientState *nc = qemu_get_subqueue(n->nic, i); 537 538 if (!get_vhost_net(nc->peer)) { 539 continue; 540 } 541 vhost_net_ack_features(get_vhost_net(nc->peer), features); 542 } 543 544 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 545 memset(n->vlans, 0, MAX_VLAN >> 3); 546 } else { 547 memset(n->vlans, 0xff, MAX_VLAN >> 3); 548 } 549 } 550 551 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 552 struct iovec *iov, unsigned int iov_cnt) 553 { 554 uint8_t on; 555 size_t s; 556 NetClientState *nc = qemu_get_queue(n->nic); 557 558 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 559 if (s != sizeof(on)) { 560 return VIRTIO_NET_ERR; 561 } 562 563 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 564 n->promisc = on; 565 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 566 n->allmulti = on; 567 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 568 n->alluni = on; 569 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 570 n->nomulti = on; 571 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 572 n->nouni = on; 573 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 574 n->nobcast = on; 575 } else { 576 return VIRTIO_NET_ERR; 577 } 578 579 rxfilter_notify(nc); 580 581 return VIRTIO_NET_OK; 582 } 583 584 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 585 struct iovec *iov, unsigned int iov_cnt) 586 { 587 VirtIODevice *vdev = VIRTIO_DEVICE(n); 588 uint64_t offloads; 589 size_t s; 590 591 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 592 return VIRTIO_NET_ERR; 593 } 594 595 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 596 if (s != sizeof(offloads)) { 597 return VIRTIO_NET_ERR; 598 } 599 600 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 601 uint64_t supported_offloads; 602 603 if (!n->has_vnet_hdr) { 604 return VIRTIO_NET_ERR; 605 } 606 607 supported_offloads = virtio_net_supported_guest_offloads(n); 608 if (offloads & ~supported_offloads) { 609 return VIRTIO_NET_ERR; 610 } 611 612 n->curr_guest_offloads = offloads; 613 virtio_net_apply_guest_offloads(n); 614 615 return VIRTIO_NET_OK; 616 } else { 617 return VIRTIO_NET_ERR; 618 } 619 } 620 621 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 622 struct iovec *iov, unsigned int iov_cnt) 623 { 624 VirtIODevice *vdev = VIRTIO_DEVICE(n); 625 struct virtio_net_ctrl_mac mac_data; 626 size_t s; 627 NetClientState *nc = qemu_get_queue(n->nic); 628 629 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 630 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 631 return VIRTIO_NET_ERR; 632 } 633 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 634 assert(s == sizeof(n->mac)); 635 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 636 rxfilter_notify(nc); 637 638 return VIRTIO_NET_OK; 639 } 640 641 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 642 return VIRTIO_NET_ERR; 643 } 644 645 int in_use = 0; 646 int first_multi = 0; 647 uint8_t uni_overflow = 0; 648 uint8_t multi_overflow = 0; 649 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 650 651 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 652 sizeof(mac_data.entries)); 653 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 654 if (s != sizeof(mac_data.entries)) { 655 goto error; 656 } 657 iov_discard_front(&iov, &iov_cnt, s); 658 659 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 660 goto error; 661 } 662 663 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 664 s = iov_to_buf(iov, iov_cnt, 0, macs, 665 mac_data.entries * ETH_ALEN); 666 if (s != mac_data.entries * ETH_ALEN) { 667 goto error; 668 } 669 in_use += mac_data.entries; 670 } else { 671 uni_overflow = 1; 672 } 673 674 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 675 676 first_multi = in_use; 677 678 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 679 sizeof(mac_data.entries)); 680 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 681 if (s != sizeof(mac_data.entries)) { 682 goto error; 683 } 684 685 iov_discard_front(&iov, &iov_cnt, s); 686 687 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 688 goto error; 689 } 690 691 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 692 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 693 mac_data.entries * ETH_ALEN); 694 if (s != mac_data.entries * ETH_ALEN) { 695 goto error; 696 } 697 in_use += mac_data.entries; 698 } else { 699 multi_overflow = 1; 700 } 701 702 n->mac_table.in_use = in_use; 703 n->mac_table.first_multi = first_multi; 704 n->mac_table.uni_overflow = uni_overflow; 705 n->mac_table.multi_overflow = multi_overflow; 706 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 707 g_free(macs); 708 rxfilter_notify(nc); 709 710 return VIRTIO_NET_OK; 711 712 error: 713 g_free(macs); 714 return VIRTIO_NET_ERR; 715 } 716 717 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 718 struct iovec *iov, unsigned int iov_cnt) 719 { 720 VirtIODevice *vdev = VIRTIO_DEVICE(n); 721 uint16_t vid; 722 size_t s; 723 NetClientState *nc = qemu_get_queue(n->nic); 724 725 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 726 vid = virtio_lduw_p(vdev, &vid); 727 if (s != sizeof(vid)) { 728 return VIRTIO_NET_ERR; 729 } 730 731 if (vid >= MAX_VLAN) 732 return VIRTIO_NET_ERR; 733 734 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 735 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 736 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 737 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 738 else 739 return VIRTIO_NET_ERR; 740 741 rxfilter_notify(nc); 742 743 return VIRTIO_NET_OK; 744 } 745 746 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 747 struct iovec *iov, unsigned int iov_cnt) 748 { 749 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 750 n->status & VIRTIO_NET_S_ANNOUNCE) { 751 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 752 if (n->announce_counter) { 753 timer_mod(n->announce_timer, 754 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 755 self_announce_delay(n->announce_counter)); 756 } 757 return VIRTIO_NET_OK; 758 } else { 759 return VIRTIO_NET_ERR; 760 } 761 } 762 763 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 764 struct iovec *iov, unsigned int iov_cnt) 765 { 766 VirtIODevice *vdev = VIRTIO_DEVICE(n); 767 struct virtio_net_ctrl_mq mq; 768 size_t s; 769 uint16_t queues; 770 771 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 772 if (s != sizeof(mq)) { 773 return VIRTIO_NET_ERR; 774 } 775 776 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 777 return VIRTIO_NET_ERR; 778 } 779 780 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 781 782 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 783 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 784 queues > n->max_queues || 785 !n->multiqueue) { 786 return VIRTIO_NET_ERR; 787 } 788 789 n->curr_queues = queues; 790 /* stop the backend before changing the number of queues to avoid handling a 791 * disabled queue */ 792 virtio_net_set_status(vdev, vdev->status); 793 virtio_net_set_queues(n); 794 795 return VIRTIO_NET_OK; 796 } 797 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 798 { 799 VirtIONet *n = VIRTIO_NET(vdev); 800 struct virtio_net_ctrl_hdr ctrl; 801 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 802 VirtQueueElement elem; 803 size_t s; 804 struct iovec *iov, *iov2; 805 unsigned int iov_cnt; 806 807 while (virtqueue_pop(vq, &elem)) { 808 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 809 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 810 error_report("virtio-net ctrl missing headers"); 811 exit(1); 812 } 813 814 iov_cnt = elem.out_num; 815 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num); 816 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 817 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 818 if (s != sizeof(ctrl)) { 819 status = VIRTIO_NET_ERR; 820 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 821 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 822 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 823 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 824 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 825 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 826 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 827 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); 828 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 829 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 830 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 831 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 832 } 833 834 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 835 assert(s == sizeof(status)); 836 837 virtqueue_push(vq, &elem, sizeof(status)); 838 virtio_notify(vdev, vq); 839 g_free(iov2); 840 } 841 } 842 843 /* RX */ 844 845 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 846 { 847 VirtIONet *n = VIRTIO_NET(vdev); 848 int queue_index = vq2q(virtio_get_queue_index(vq)); 849 850 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 851 } 852 853 static int virtio_net_can_receive(NetClientState *nc) 854 { 855 VirtIONet *n = qemu_get_nic_opaque(nc); 856 VirtIODevice *vdev = VIRTIO_DEVICE(n); 857 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 858 859 if (!vdev->vm_running) { 860 return 0; 861 } 862 863 if (nc->queue_index >= n->curr_queues) { 864 return 0; 865 } 866 867 if (!virtio_queue_ready(q->rx_vq) || 868 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 869 return 0; 870 } 871 872 return 1; 873 } 874 875 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 876 { 877 VirtIONet *n = q->n; 878 if (virtio_queue_empty(q->rx_vq) || 879 (n->mergeable_rx_bufs && 880 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 881 virtio_queue_set_notification(q->rx_vq, 1); 882 883 /* To avoid a race condition where the guest has made some buffers 884 * available after the above check but before notification was 885 * enabled, check for available buffers again. 886 */ 887 if (virtio_queue_empty(q->rx_vq) || 888 (n->mergeable_rx_bufs && 889 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 890 return 0; 891 } 892 } 893 894 virtio_queue_set_notification(q->rx_vq, 0); 895 return 1; 896 } 897 898 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 899 { 900 virtio_tswap16s(vdev, &hdr->hdr_len); 901 virtio_tswap16s(vdev, &hdr->gso_size); 902 virtio_tswap16s(vdev, &hdr->csum_start); 903 virtio_tswap16s(vdev, &hdr->csum_offset); 904 } 905 906 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 907 * it never finds out that the packets don't have valid checksums. This 908 * causes dhclient to get upset. Fedora's carried a patch for ages to 909 * fix this with Xen but it hasn't appeared in an upstream release of 910 * dhclient yet. 911 * 912 * To avoid breaking existing guests, we catch udp packets and add 913 * checksums. This is terrible but it's better than hacking the guest 914 * kernels. 915 * 916 * N.B. if we introduce a zero-copy API, this operation is no longer free so 917 * we should provide a mechanism to disable it to avoid polluting the host 918 * cache. 919 */ 920 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 921 uint8_t *buf, size_t size) 922 { 923 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 924 (size > 27 && size < 1500) && /* normal sized MTU */ 925 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 926 (buf[23] == 17) && /* ip.protocol == UDP */ 927 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 928 net_checksum_calculate(buf, size); 929 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 930 } 931 } 932 933 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 934 const void *buf, size_t size) 935 { 936 if (n->has_vnet_hdr) { 937 /* FIXME this cast is evil */ 938 void *wbuf = (void *)buf; 939 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 940 size - n->host_hdr_len); 941 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 942 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 943 } else { 944 struct virtio_net_hdr hdr = { 945 .flags = 0, 946 .gso_type = VIRTIO_NET_HDR_GSO_NONE 947 }; 948 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 949 } 950 } 951 952 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 953 { 954 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 955 static const uint8_t vlan[] = {0x81, 0x00}; 956 uint8_t *ptr = (uint8_t *)buf; 957 int i; 958 959 if (n->promisc) 960 return 1; 961 962 ptr += n->host_hdr_len; 963 964 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 965 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 966 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 967 return 0; 968 } 969 970 if (ptr[0] & 1) { // multicast 971 if (!memcmp(ptr, bcast, sizeof(bcast))) { 972 return !n->nobcast; 973 } else if (n->nomulti) { 974 return 0; 975 } else if (n->allmulti || n->mac_table.multi_overflow) { 976 return 1; 977 } 978 979 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 980 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 981 return 1; 982 } 983 } 984 } else { // unicast 985 if (n->nouni) { 986 return 0; 987 } else if (n->alluni || n->mac_table.uni_overflow) { 988 return 1; 989 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 990 return 1; 991 } 992 993 for (i = 0; i < n->mac_table.first_multi; i++) { 994 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 995 return 1; 996 } 997 } 998 } 999 1000 return 0; 1001 } 1002 1003 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 1004 { 1005 VirtIONet *n = qemu_get_nic_opaque(nc); 1006 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1007 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1008 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1009 struct virtio_net_hdr_mrg_rxbuf mhdr; 1010 unsigned mhdr_cnt = 0; 1011 size_t offset, i, guest_offset; 1012 1013 if (!virtio_net_can_receive(nc)) { 1014 return -1; 1015 } 1016 1017 /* hdr_len refers to the header we supply to the guest */ 1018 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1019 return 0; 1020 } 1021 1022 if (!receive_filter(n, buf, size)) 1023 return size; 1024 1025 offset = i = 0; 1026 1027 while (offset < size) { 1028 VirtQueueElement elem; 1029 int len, total; 1030 const struct iovec *sg = elem.in_sg; 1031 1032 total = 0; 1033 1034 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 1035 if (i == 0) 1036 return -1; 1037 error_report("virtio-net unexpected empty queue: " 1038 "i %zd mergeable %d offset %zd, size %zd, " 1039 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 1040 i, n->mergeable_rx_bufs, offset, size, 1041 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 1042 exit(1); 1043 } 1044 1045 if (elem.in_num < 1) { 1046 error_report("virtio-net receive queue contains no in buffers"); 1047 exit(1); 1048 } 1049 1050 if (i == 0) { 1051 assert(offset == 0); 1052 if (n->mergeable_rx_bufs) { 1053 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1054 sg, elem.in_num, 1055 offsetof(typeof(mhdr), num_buffers), 1056 sizeof(mhdr.num_buffers)); 1057 } 1058 1059 receive_header(n, sg, elem.in_num, buf, size); 1060 offset = n->host_hdr_len; 1061 total += n->guest_hdr_len; 1062 guest_offset = n->guest_hdr_len; 1063 } else { 1064 guest_offset = 0; 1065 } 1066 1067 /* copy in packet. ugh */ 1068 len = iov_from_buf(sg, elem.in_num, guest_offset, 1069 buf + offset, size - offset); 1070 total += len; 1071 offset += len; 1072 /* If buffers can't be merged, at this point we 1073 * must have consumed the complete packet. 1074 * Otherwise, drop it. */ 1075 if (!n->mergeable_rx_bufs && offset < size) { 1076 #if 0 1077 error_report("virtio-net truncated non-mergeable packet: " 1078 "i %zd mergeable %d offset %zd, size %zd, " 1079 "guest hdr len %zd, host hdr len %zd", 1080 i, n->mergeable_rx_bufs, 1081 offset, size, n->guest_hdr_len, n->host_hdr_len); 1082 #endif 1083 return size; 1084 } 1085 1086 /* signal other side */ 1087 virtqueue_fill(q->rx_vq, &elem, total, i++); 1088 } 1089 1090 if (mhdr_cnt) { 1091 virtio_stw_p(vdev, &mhdr.num_buffers, i); 1092 iov_from_buf(mhdr_sg, mhdr_cnt, 1093 0, 1094 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1095 } 1096 1097 virtqueue_flush(q->rx_vq, i); 1098 virtio_notify(vdev, q->rx_vq); 1099 1100 return size; 1101 } 1102 1103 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1104 1105 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1106 { 1107 VirtIONet *n = qemu_get_nic_opaque(nc); 1108 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1109 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1110 1111 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1112 virtio_notify(vdev, q->tx_vq); 1113 1114 q->async_tx.elem.out_num = q->async_tx.len = 0; 1115 1116 virtio_queue_set_notification(q->tx_vq, 1); 1117 virtio_net_flush_tx(q); 1118 } 1119 1120 /* TX */ 1121 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1122 { 1123 VirtIONet *n = q->n; 1124 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1125 VirtQueueElement elem; 1126 int32_t num_packets = 0; 1127 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1128 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1129 return num_packets; 1130 } 1131 1132 if (q->async_tx.elem.out_num) { 1133 virtio_queue_set_notification(q->tx_vq, 0); 1134 return num_packets; 1135 } 1136 1137 while (virtqueue_pop(q->tx_vq, &elem)) { 1138 ssize_t ret, len; 1139 unsigned int out_num = elem.out_num; 1140 struct iovec *out_sg = &elem.out_sg[0]; 1141 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1142 1143 if (out_num < 1) { 1144 error_report("virtio-net header not in first element"); 1145 exit(1); 1146 } 1147 1148 if (n->has_vnet_hdr) { 1149 if (out_sg[0].iov_len < n->guest_hdr_len) { 1150 error_report("virtio-net header incorrect"); 1151 exit(1); 1152 } 1153 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); 1154 } 1155 1156 /* 1157 * If host wants to see the guest header as is, we can 1158 * pass it on unchanged. Otherwise, copy just the parts 1159 * that host is interested in. 1160 */ 1161 assert(n->host_hdr_len <= n->guest_hdr_len); 1162 if (n->host_hdr_len != n->guest_hdr_len) { 1163 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1164 out_sg, out_num, 1165 0, n->host_hdr_len); 1166 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1167 out_sg, out_num, 1168 n->guest_hdr_len, -1); 1169 out_num = sg_num; 1170 out_sg = sg; 1171 } 1172 1173 len = n->guest_hdr_len; 1174 1175 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1176 out_sg, out_num, virtio_net_tx_complete); 1177 if (ret == 0) { 1178 virtio_queue_set_notification(q->tx_vq, 0); 1179 q->async_tx.elem = elem; 1180 q->async_tx.len = len; 1181 return -EBUSY; 1182 } 1183 1184 len += ret; 1185 1186 virtqueue_push(q->tx_vq, &elem, 0); 1187 virtio_notify(vdev, q->tx_vq); 1188 1189 if (++num_packets >= n->tx_burst) { 1190 break; 1191 } 1192 } 1193 return num_packets; 1194 } 1195 1196 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1197 { 1198 VirtIONet *n = VIRTIO_NET(vdev); 1199 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1200 1201 /* This happens when device was stopped but VCPU wasn't. */ 1202 if (!vdev->vm_running) { 1203 q->tx_waiting = 1; 1204 return; 1205 } 1206 1207 if (q->tx_waiting) { 1208 virtio_queue_set_notification(vq, 1); 1209 timer_del(q->tx_timer); 1210 q->tx_waiting = 0; 1211 virtio_net_flush_tx(q); 1212 } else { 1213 timer_mod(q->tx_timer, 1214 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1215 q->tx_waiting = 1; 1216 virtio_queue_set_notification(vq, 0); 1217 } 1218 } 1219 1220 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1221 { 1222 VirtIONet *n = VIRTIO_NET(vdev); 1223 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1224 1225 if (unlikely(q->tx_waiting)) { 1226 return; 1227 } 1228 q->tx_waiting = 1; 1229 /* This happens when device was stopped but VCPU wasn't. */ 1230 if (!vdev->vm_running) { 1231 return; 1232 } 1233 virtio_queue_set_notification(vq, 0); 1234 qemu_bh_schedule(q->tx_bh); 1235 } 1236 1237 static void virtio_net_tx_timer(void *opaque) 1238 { 1239 VirtIONetQueue *q = opaque; 1240 VirtIONet *n = q->n; 1241 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1242 /* This happens when device was stopped but BH wasn't. */ 1243 if (!vdev->vm_running) { 1244 /* Make sure tx waiting is set, so we'll run when restarted. */ 1245 assert(q->tx_waiting); 1246 return; 1247 } 1248 1249 q->tx_waiting = 0; 1250 1251 /* Just in case the driver is not ready on more */ 1252 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1253 return; 1254 } 1255 1256 virtio_queue_set_notification(q->tx_vq, 1); 1257 virtio_net_flush_tx(q); 1258 } 1259 1260 static void virtio_net_tx_bh(void *opaque) 1261 { 1262 VirtIONetQueue *q = opaque; 1263 VirtIONet *n = q->n; 1264 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1265 int32_t ret; 1266 1267 /* This happens when device was stopped but BH wasn't. */ 1268 if (!vdev->vm_running) { 1269 /* Make sure tx waiting is set, so we'll run when restarted. */ 1270 assert(q->tx_waiting); 1271 return; 1272 } 1273 1274 q->tx_waiting = 0; 1275 1276 /* Just in case the driver is not ready on more */ 1277 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1278 return; 1279 } 1280 1281 ret = virtio_net_flush_tx(q); 1282 if (ret == -EBUSY) { 1283 return; /* Notification re-enable handled by tx_complete */ 1284 } 1285 1286 /* If we flush a full burst of packets, assume there are 1287 * more coming and immediately reschedule */ 1288 if (ret >= n->tx_burst) { 1289 qemu_bh_schedule(q->tx_bh); 1290 q->tx_waiting = 1; 1291 return; 1292 } 1293 1294 /* If less than a full burst, re-enable notification and flush 1295 * anything that may have come in while we weren't looking. If 1296 * we find something, assume the guest is still active and reschedule */ 1297 virtio_queue_set_notification(q->tx_vq, 1); 1298 if (virtio_net_flush_tx(q) > 0) { 1299 virtio_queue_set_notification(q->tx_vq, 0); 1300 qemu_bh_schedule(q->tx_bh); 1301 q->tx_waiting = 1; 1302 } 1303 } 1304 1305 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1306 { 1307 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1308 int i, max = multiqueue ? n->max_queues : 1; 1309 1310 n->multiqueue = multiqueue; 1311 1312 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1313 virtio_del_queue(vdev, i); 1314 } 1315 1316 for (i = 1; i < max; i++) { 1317 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1318 if (n->vqs[i].tx_timer) { 1319 n->vqs[i].tx_vq = 1320 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1321 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1322 virtio_net_tx_timer, 1323 &n->vqs[i]); 1324 } else { 1325 n->vqs[i].tx_vq = 1326 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1327 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1328 } 1329 1330 n->vqs[i].tx_waiting = 0; 1331 n->vqs[i].n = n; 1332 } 1333 1334 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1335 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1336 * breaking them. 1337 */ 1338 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1339 1340 virtio_net_set_queues(n); 1341 } 1342 1343 static void virtio_net_save(QEMUFile *f, void *opaque) 1344 { 1345 VirtIONet *n = opaque; 1346 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1347 1348 /* At this point, backend must be stopped, otherwise 1349 * it might keep writing to memory. */ 1350 assert(!n->vhost_started); 1351 virtio_save(vdev, f); 1352 } 1353 1354 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) 1355 { 1356 VirtIONet *n = VIRTIO_NET(vdev); 1357 int i; 1358 1359 qemu_put_buffer(f, n->mac, ETH_ALEN); 1360 qemu_put_be32(f, n->vqs[0].tx_waiting); 1361 qemu_put_be32(f, n->mergeable_rx_bufs); 1362 qemu_put_be16(f, n->status); 1363 qemu_put_byte(f, n->promisc); 1364 qemu_put_byte(f, n->allmulti); 1365 qemu_put_be32(f, n->mac_table.in_use); 1366 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1367 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1368 qemu_put_be32(f, n->has_vnet_hdr); 1369 qemu_put_byte(f, n->mac_table.multi_overflow); 1370 qemu_put_byte(f, n->mac_table.uni_overflow); 1371 qemu_put_byte(f, n->alluni); 1372 qemu_put_byte(f, n->nomulti); 1373 qemu_put_byte(f, n->nouni); 1374 qemu_put_byte(f, n->nobcast); 1375 qemu_put_byte(f, n->has_ufo); 1376 if (n->max_queues > 1) { 1377 qemu_put_be16(f, n->max_queues); 1378 qemu_put_be16(f, n->curr_queues); 1379 for (i = 1; i < n->curr_queues; i++) { 1380 qemu_put_be32(f, n->vqs[i].tx_waiting); 1381 } 1382 } 1383 1384 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1385 qemu_put_be64(f, n->curr_guest_offloads); 1386 } 1387 } 1388 1389 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1390 { 1391 VirtIONet *n = opaque; 1392 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1393 1394 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1395 return -EINVAL; 1396 1397 return virtio_load(vdev, f, version_id); 1398 } 1399 1400 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, 1401 int version_id) 1402 { 1403 VirtIONet *n = VIRTIO_NET(vdev); 1404 int i, link_down; 1405 1406 qemu_get_buffer(f, n->mac, ETH_ALEN); 1407 n->vqs[0].tx_waiting = qemu_get_be32(f); 1408 1409 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1410 1411 if (version_id >= 3) 1412 n->status = qemu_get_be16(f); 1413 1414 if (version_id >= 4) { 1415 if (version_id < 8) { 1416 n->promisc = qemu_get_be32(f); 1417 n->allmulti = qemu_get_be32(f); 1418 } else { 1419 n->promisc = qemu_get_byte(f); 1420 n->allmulti = qemu_get_byte(f); 1421 } 1422 } 1423 1424 if (version_id >= 5) { 1425 n->mac_table.in_use = qemu_get_be32(f); 1426 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1427 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1428 qemu_get_buffer(f, n->mac_table.macs, 1429 n->mac_table.in_use * ETH_ALEN); 1430 } else { 1431 int64_t i; 1432 1433 /* Overflow detected - can happen if source has a larger MAC table. 1434 * We simply set overflow flag so there's no need to maintain the 1435 * table of addresses, discard them all. 1436 * Note: 64 bit math to avoid integer overflow. 1437 */ 1438 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { 1439 qemu_get_byte(f); 1440 } 1441 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1442 n->mac_table.in_use = 0; 1443 } 1444 } 1445 1446 if (version_id >= 6) 1447 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1448 1449 if (version_id >= 7) { 1450 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1451 error_report("virtio-net: saved image requires vnet_hdr=on"); 1452 return -1; 1453 } 1454 } 1455 1456 if (version_id >= 9) { 1457 n->mac_table.multi_overflow = qemu_get_byte(f); 1458 n->mac_table.uni_overflow = qemu_get_byte(f); 1459 } 1460 1461 if (version_id >= 10) { 1462 n->alluni = qemu_get_byte(f); 1463 n->nomulti = qemu_get_byte(f); 1464 n->nouni = qemu_get_byte(f); 1465 n->nobcast = qemu_get_byte(f); 1466 } 1467 1468 if (version_id >= 11) { 1469 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1470 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1471 return -1; 1472 } 1473 } 1474 1475 if (n->max_queues > 1) { 1476 if (n->max_queues != qemu_get_be16(f)) { 1477 error_report("virtio-net: different max_queues "); 1478 return -1; 1479 } 1480 1481 n->curr_queues = qemu_get_be16(f); 1482 if (n->curr_queues > n->max_queues) { 1483 error_report("virtio-net: curr_queues %x > max_queues %x", 1484 n->curr_queues, n->max_queues); 1485 return -1; 1486 } 1487 for (i = 1; i < n->curr_queues; i++) { 1488 n->vqs[i].tx_waiting = qemu_get_be32(f); 1489 } 1490 } 1491 1492 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1493 n->curr_guest_offloads = qemu_get_be64(f); 1494 } else { 1495 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1496 } 1497 1498 if (peer_has_vnet_hdr(n)) { 1499 virtio_net_apply_guest_offloads(n); 1500 } 1501 1502 virtio_net_set_queues(n); 1503 1504 /* Find the first multicast entry in the saved MAC filter */ 1505 for (i = 0; i < n->mac_table.in_use; i++) { 1506 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1507 break; 1508 } 1509 } 1510 n->mac_table.first_multi = i; 1511 1512 /* nc.link_down can't be migrated, so infer link_down according 1513 * to link status bit in n->status */ 1514 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1515 for (i = 0; i < n->max_queues; i++) { 1516 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1517 } 1518 1519 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 1520 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 1521 n->announce_counter = SELF_ANNOUNCE_ROUNDS; 1522 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); 1523 } 1524 1525 return 0; 1526 } 1527 1528 static NetClientInfo net_virtio_info = { 1529 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1530 .size = sizeof(NICState), 1531 .can_receive = virtio_net_can_receive, 1532 .receive = virtio_net_receive, 1533 .link_status_changed = virtio_net_set_link_status, 1534 .query_rx_filter = virtio_net_query_rxfilter, 1535 }; 1536 1537 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1538 { 1539 VirtIONet *n = VIRTIO_NET(vdev); 1540 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1541 assert(n->vhost_started); 1542 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 1543 } 1544 1545 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1546 bool mask) 1547 { 1548 VirtIONet *n = VIRTIO_NET(vdev); 1549 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1550 assert(n->vhost_started); 1551 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), 1552 vdev, idx, mask); 1553 } 1554 1555 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1556 { 1557 int i, config_size = 0; 1558 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 1559 for (i = 0; feature_sizes[i].flags != 0; i++) { 1560 if (host_features & feature_sizes[i].flags) { 1561 config_size = MAX(feature_sizes[i].end, config_size); 1562 } 1563 } 1564 n->config_size = config_size; 1565 } 1566 1567 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1568 const char *type) 1569 { 1570 /* 1571 * The name can be NULL, the netclient name will be type.x. 1572 */ 1573 assert(type != NULL); 1574 1575 g_free(n->netclient_name); 1576 g_free(n->netclient_type); 1577 n->netclient_name = g_strdup(name); 1578 n->netclient_type = g_strdup(type); 1579 } 1580 1581 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1582 { 1583 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1584 VirtIONet *n = VIRTIO_NET(dev); 1585 NetClientState *nc; 1586 int i; 1587 1588 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1589 1590 n->max_queues = MAX(n->nic_conf.peers.queues, 1); 1591 if (n->max_queues * 2 + 1 > VIRTIO_PCI_QUEUE_MAX) { 1592 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1593 "must be a postive integer less than %d.", 1594 n->max_queues, (VIRTIO_PCI_QUEUE_MAX - 1) / 2); 1595 virtio_cleanup(vdev); 1596 return; 1597 } 1598 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1599 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1600 n->curr_queues = 1; 1601 n->vqs[0].n = n; 1602 n->tx_timeout = n->net_conf.txtimer; 1603 1604 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1605 && strcmp(n->net_conf.tx, "bh")) { 1606 error_report("virtio-net: " 1607 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1608 n->net_conf.tx); 1609 error_report("Defaulting to \"bh\""); 1610 } 1611 1612 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1613 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1614 virtio_net_handle_tx_timer); 1615 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, 1616 &n->vqs[0]); 1617 } else { 1618 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1619 virtio_net_handle_tx_bh); 1620 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1621 } 1622 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1623 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1624 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1625 n->status = VIRTIO_NET_S_LINK_UP; 1626 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 1627 virtio_net_announce_timer, n); 1628 1629 if (n->netclient_type) { 1630 /* 1631 * Happen when virtio_net_set_netclient_name has been called. 1632 */ 1633 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1634 n->netclient_type, n->netclient_name, n); 1635 } else { 1636 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1637 object_get_typename(OBJECT(dev)), dev->id, n); 1638 } 1639 1640 peer_test_vnet_hdr(n); 1641 if (peer_has_vnet_hdr(n)) { 1642 for (i = 0; i < n->max_queues; i++) { 1643 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1644 } 1645 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1646 } else { 1647 n->host_hdr_len = 0; 1648 } 1649 1650 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1651 1652 n->vqs[0].tx_waiting = 0; 1653 n->tx_burst = n->net_conf.txburst; 1654 virtio_net_set_mrg_rx_bufs(n, 0); 1655 n->promisc = 1; /* for compatibility */ 1656 1657 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1658 1659 n->vlans = g_malloc0(MAX_VLAN >> 3); 1660 1661 nc = qemu_get_queue(n->nic); 1662 nc->rxfilter_notify_enabled = 1; 1663 1664 n->qdev = dev; 1665 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1666 virtio_net_save, virtio_net_load, n); 1667 } 1668 1669 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1670 { 1671 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1672 VirtIONet *n = VIRTIO_NET(dev); 1673 int i; 1674 1675 /* This will stop vhost backend if appropriate. */ 1676 virtio_net_set_status(vdev, 0); 1677 1678 unregister_savevm(dev, "virtio-net", n); 1679 1680 g_free(n->netclient_name); 1681 n->netclient_name = NULL; 1682 g_free(n->netclient_type); 1683 n->netclient_type = NULL; 1684 1685 g_free(n->mac_table.macs); 1686 g_free(n->vlans); 1687 1688 for (i = 0; i < n->max_queues; i++) { 1689 VirtIONetQueue *q = &n->vqs[i]; 1690 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1691 1692 qemu_purge_queued_packets(nc); 1693 1694 if (q->tx_timer) { 1695 timer_del(q->tx_timer); 1696 timer_free(q->tx_timer); 1697 } else if (q->tx_bh) { 1698 qemu_bh_delete(q->tx_bh); 1699 } 1700 } 1701 1702 timer_del(n->announce_timer); 1703 timer_free(n->announce_timer); 1704 g_free(n->vqs); 1705 qemu_del_nic(n->nic); 1706 virtio_cleanup(vdev); 1707 } 1708 1709 static void virtio_net_instance_init(Object *obj) 1710 { 1711 VirtIONet *n = VIRTIO_NET(obj); 1712 1713 /* 1714 * The default config_size is sizeof(struct virtio_net_config). 1715 * Can be overriden with virtio_net_set_config_size. 1716 */ 1717 n->config_size = sizeof(struct virtio_net_config); 1718 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 1719 "bootindex", "/ethernet-phy@0", 1720 DEVICE(n), NULL); 1721 } 1722 1723 static Property virtio_net_properties[] = { 1724 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1725 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1726 TX_TIMER_INTERVAL), 1727 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1728 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1729 DEFINE_PROP_END_OF_LIST(), 1730 }; 1731 1732 static void virtio_net_class_init(ObjectClass *klass, void *data) 1733 { 1734 DeviceClass *dc = DEVICE_CLASS(klass); 1735 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1736 1737 dc->props = virtio_net_properties; 1738 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1739 vdc->realize = virtio_net_device_realize; 1740 vdc->unrealize = virtio_net_device_unrealize; 1741 vdc->get_config = virtio_net_get_config; 1742 vdc->set_config = virtio_net_set_config; 1743 vdc->get_features = virtio_net_get_features; 1744 vdc->set_features = virtio_net_set_features; 1745 vdc->bad_features = virtio_net_bad_features; 1746 vdc->reset = virtio_net_reset; 1747 vdc->set_status = virtio_net_set_status; 1748 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1749 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1750 vdc->load = virtio_net_load_device; 1751 vdc->save = virtio_net_save_device; 1752 } 1753 1754 static const TypeInfo virtio_net_info = { 1755 .name = TYPE_VIRTIO_NET, 1756 .parent = TYPE_VIRTIO_DEVICE, 1757 .instance_size = sizeof(VirtIONet), 1758 .instance_init = virtio_net_instance_init, 1759 .class_init = virtio_net_class_init, 1760 }; 1761 1762 static void virtio_register_types(void) 1763 { 1764 type_register_static(&virtio_net_info); 1765 } 1766 1767 type_init(virtio_register_types) 1768