1 /* 2 * Virtio Network Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/iov.h" 15 #include "hw/virtio/virtio.h" 16 #include "net/net.h" 17 #include "net/checksum.h" 18 #include "net/tap.h" 19 #include "qemu/error-report.h" 20 #include "qemu/timer.h" 21 #include "hw/virtio/virtio-net.h" 22 #include "net/vhost_net.h" 23 #include "hw/virtio/virtio-bus.h" 24 #include "qapi/qmp/qjson.h" 25 #include "monitor/monitor.h" 26 27 #define VIRTIO_NET_VM_VERSION 11 28 29 #define MAC_TABLE_ENTRIES 64 30 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 31 32 /* 33 * Calculate the number of bytes up to and including the given 'field' of 34 * 'container'. 35 */ 36 #define endof(container, field) \ 37 (offsetof(container, field) + sizeof(((container *)0)->field)) 38 39 typedef struct VirtIOFeature { 40 uint32_t flags; 41 size_t end; 42 } VirtIOFeature; 43 44 static VirtIOFeature feature_sizes[] = { 45 {.flags = 1 << VIRTIO_NET_F_MAC, 46 .end = endof(struct virtio_net_config, mac)}, 47 {.flags = 1 << VIRTIO_NET_F_STATUS, 48 .end = endof(struct virtio_net_config, status)}, 49 {.flags = 1 << VIRTIO_NET_F_MQ, 50 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 51 {} 52 }; 53 54 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 55 { 56 VirtIONet *n = qemu_get_nic_opaque(nc); 57 58 return &n->vqs[nc->queue_index]; 59 } 60 61 static int vq2q(int queue_index) 62 { 63 return queue_index / 2; 64 } 65 66 /* TODO 67 * - we could suppress RX interrupt if we were so inclined. 68 */ 69 70 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 71 { 72 VirtIONet *n = VIRTIO_NET(vdev); 73 struct virtio_net_config netcfg; 74 75 stw_p(&netcfg.status, n->status); 76 stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); 77 memcpy(netcfg.mac, n->mac, ETH_ALEN); 78 memcpy(config, &netcfg, n->config_size); 79 } 80 81 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 82 { 83 VirtIONet *n = VIRTIO_NET(vdev); 84 struct virtio_net_config netcfg = {}; 85 86 memcpy(&netcfg, config, n->config_size); 87 88 if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && 89 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 90 memcpy(n->mac, netcfg.mac, ETH_ALEN); 91 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 92 } 93 } 94 95 static bool virtio_net_started(VirtIONet *n, uint8_t status) 96 { 97 VirtIODevice *vdev = VIRTIO_DEVICE(n); 98 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 99 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 100 } 101 102 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 103 { 104 VirtIODevice *vdev = VIRTIO_DEVICE(n); 105 NetClientState *nc = qemu_get_queue(n->nic); 106 int queues = n->multiqueue ? n->max_queues : 1; 107 108 if (!nc->peer) { 109 return; 110 } 111 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 112 return; 113 } 114 115 if (!tap_get_vhost_net(nc->peer)) { 116 return; 117 } 118 119 if (!!n->vhost_started == 120 (virtio_net_started(n, status) && !nc->peer->link_down)) { 121 return; 122 } 123 if (!n->vhost_started) { 124 int r; 125 if (!vhost_net_query(tap_get_vhost_net(nc->peer), vdev)) { 126 return; 127 } 128 n->vhost_started = 1; 129 r = vhost_net_start(vdev, n->nic->ncs, queues); 130 if (r < 0) { 131 error_report("unable to start vhost net: %d: " 132 "falling back on userspace virtio", -r); 133 n->vhost_started = 0; 134 } 135 } else { 136 vhost_net_stop(vdev, n->nic->ncs, queues); 137 n->vhost_started = 0; 138 } 139 } 140 141 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 142 { 143 VirtIONet *n = VIRTIO_NET(vdev); 144 VirtIONetQueue *q; 145 int i; 146 uint8_t queue_status; 147 148 virtio_net_vhost_status(n, status); 149 150 for (i = 0; i < n->max_queues; i++) { 151 q = &n->vqs[i]; 152 153 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 154 queue_status = 0; 155 } else { 156 queue_status = status; 157 } 158 159 if (!q->tx_waiting) { 160 continue; 161 } 162 163 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 164 if (q->tx_timer) { 165 timer_mod(q->tx_timer, 166 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 167 } else { 168 qemu_bh_schedule(q->tx_bh); 169 } 170 } else { 171 if (q->tx_timer) { 172 timer_del(q->tx_timer); 173 } else { 174 qemu_bh_cancel(q->tx_bh); 175 } 176 } 177 } 178 } 179 180 static void virtio_net_set_link_status(NetClientState *nc) 181 { 182 VirtIONet *n = qemu_get_nic_opaque(nc); 183 VirtIODevice *vdev = VIRTIO_DEVICE(n); 184 uint16_t old_status = n->status; 185 186 if (nc->link_down) 187 n->status &= ~VIRTIO_NET_S_LINK_UP; 188 else 189 n->status |= VIRTIO_NET_S_LINK_UP; 190 191 if (n->status != old_status) 192 virtio_notify_config(vdev); 193 194 virtio_net_set_status(vdev, vdev->status); 195 } 196 197 static void rxfilter_notify(NetClientState *nc) 198 { 199 QObject *event_data; 200 VirtIONet *n = qemu_get_nic_opaque(nc); 201 202 if (nc->rxfilter_notify_enabled) { 203 gchar *path = object_get_canonical_path(OBJECT(n->qdev)); 204 if (n->netclient_name) { 205 event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }", 206 n->netclient_name, path); 207 } else { 208 event_data = qobject_from_jsonf("{ 'path': %s }", path); 209 } 210 monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data); 211 qobject_decref(event_data); 212 g_free(path); 213 214 /* disable event notification to avoid events flooding */ 215 nc->rxfilter_notify_enabled = 0; 216 } 217 } 218 219 static char *mac_strdup_printf(const uint8_t *mac) 220 { 221 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0], 222 mac[1], mac[2], mac[3], mac[4], mac[5]); 223 } 224 225 static intList *get_vlan_table(VirtIONet *n) 226 { 227 intList *list, *entry; 228 int i, j; 229 230 list = NULL; 231 for (i = 0; i < MAX_VLAN >> 5; i++) { 232 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 233 if (n->vlans[i] & (1U << j)) { 234 entry = g_malloc0(sizeof(*entry)); 235 entry->value = (i << 5) + j; 236 entry->next = list; 237 list = entry; 238 } 239 } 240 } 241 242 return list; 243 } 244 245 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 246 { 247 VirtIONet *n = qemu_get_nic_opaque(nc); 248 VirtIODevice *vdev = VIRTIO_DEVICE(n); 249 RxFilterInfo *info; 250 strList *str_list, *entry; 251 int i; 252 253 info = g_malloc0(sizeof(*info)); 254 info->name = g_strdup(nc->name); 255 info->promiscuous = n->promisc; 256 257 if (n->nouni) { 258 info->unicast = RX_STATE_NONE; 259 } else if (n->alluni) { 260 info->unicast = RX_STATE_ALL; 261 } else { 262 info->unicast = RX_STATE_NORMAL; 263 } 264 265 if (n->nomulti) { 266 info->multicast = RX_STATE_NONE; 267 } else if (n->allmulti) { 268 info->multicast = RX_STATE_ALL; 269 } else { 270 info->multicast = RX_STATE_NORMAL; 271 } 272 273 info->broadcast_allowed = n->nobcast; 274 info->multicast_overflow = n->mac_table.multi_overflow; 275 info->unicast_overflow = n->mac_table.uni_overflow; 276 277 info->main_mac = mac_strdup_printf(n->mac); 278 279 str_list = NULL; 280 for (i = 0; i < n->mac_table.first_multi; i++) { 281 entry = g_malloc0(sizeof(*entry)); 282 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 283 entry->next = str_list; 284 str_list = entry; 285 } 286 info->unicast_table = str_list; 287 288 str_list = NULL; 289 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 290 entry = g_malloc0(sizeof(*entry)); 291 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); 292 entry->next = str_list; 293 str_list = entry; 294 } 295 info->multicast_table = str_list; 296 info->vlan_table = get_vlan_table(n); 297 298 if (!((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features)) { 299 info->vlan = RX_STATE_ALL; 300 } else if (!info->vlan_table) { 301 info->vlan = RX_STATE_NONE; 302 } else { 303 info->vlan = RX_STATE_NORMAL; 304 } 305 306 /* enable event notification after query */ 307 nc->rxfilter_notify_enabled = 1; 308 309 return info; 310 } 311 312 static void virtio_net_reset(VirtIODevice *vdev) 313 { 314 VirtIONet *n = VIRTIO_NET(vdev); 315 316 /* Reset back to compatibility mode */ 317 n->promisc = 1; 318 n->allmulti = 0; 319 n->alluni = 0; 320 n->nomulti = 0; 321 n->nouni = 0; 322 n->nobcast = 0; 323 /* multiqueue is disabled by default */ 324 n->curr_queues = 1; 325 326 /* Flush any MAC and VLAN filter table state */ 327 n->mac_table.in_use = 0; 328 n->mac_table.first_multi = 0; 329 n->mac_table.multi_overflow = 0; 330 n->mac_table.uni_overflow = 0; 331 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 332 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 333 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 334 memset(n->vlans, 0, MAX_VLAN >> 3); 335 } 336 337 static void peer_test_vnet_hdr(VirtIONet *n) 338 { 339 NetClientState *nc = qemu_get_queue(n->nic); 340 if (!nc->peer) { 341 return; 342 } 343 344 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 345 } 346 347 static int peer_has_vnet_hdr(VirtIONet *n) 348 { 349 return n->has_vnet_hdr; 350 } 351 352 static int peer_has_ufo(VirtIONet *n) 353 { 354 if (!peer_has_vnet_hdr(n)) 355 return 0; 356 357 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 358 359 return n->has_ufo; 360 } 361 362 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 363 { 364 int i; 365 NetClientState *nc; 366 367 n->mergeable_rx_bufs = mergeable_rx_bufs; 368 369 n->guest_hdr_len = n->mergeable_rx_bufs ? 370 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 371 372 for (i = 0; i < n->max_queues; i++) { 373 nc = qemu_get_subqueue(n->nic, i); 374 375 if (peer_has_vnet_hdr(n) && 376 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 377 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 378 n->host_hdr_len = n->guest_hdr_len; 379 } 380 } 381 } 382 383 static int peer_attach(VirtIONet *n, int index) 384 { 385 NetClientState *nc = qemu_get_subqueue(n->nic, index); 386 387 if (!nc->peer) { 388 return 0; 389 } 390 391 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 392 return 0; 393 } 394 395 return tap_enable(nc->peer); 396 } 397 398 static int peer_detach(VirtIONet *n, int index) 399 { 400 NetClientState *nc = qemu_get_subqueue(n->nic, index); 401 402 if (!nc->peer) { 403 return 0; 404 } 405 406 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 407 return 0; 408 } 409 410 return tap_disable(nc->peer); 411 } 412 413 static void virtio_net_set_queues(VirtIONet *n) 414 { 415 int i; 416 int r; 417 418 for (i = 0; i < n->max_queues; i++) { 419 if (i < n->curr_queues) { 420 r = peer_attach(n, i); 421 assert(!r); 422 } else { 423 r = peer_detach(n, i); 424 assert(!r); 425 } 426 } 427 } 428 429 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 430 431 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 432 { 433 VirtIONet *n = VIRTIO_NET(vdev); 434 NetClientState *nc = qemu_get_queue(n->nic); 435 436 features |= (1 << VIRTIO_NET_F_MAC); 437 438 if (!peer_has_vnet_hdr(n)) { 439 features &= ~(0x1 << VIRTIO_NET_F_CSUM); 440 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); 441 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); 442 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); 443 444 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); 445 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); 446 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); 447 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); 448 } 449 450 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 451 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); 452 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); 453 } 454 455 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 456 return features; 457 } 458 if (!tap_get_vhost_net(nc->peer)) { 459 return features; 460 } 461 return vhost_net_get_features(tap_get_vhost_net(nc->peer), features); 462 } 463 464 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 465 { 466 uint32_t features = 0; 467 468 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 469 * but also these: */ 470 features |= (1 << VIRTIO_NET_F_MAC); 471 features |= (1 << VIRTIO_NET_F_CSUM); 472 features |= (1 << VIRTIO_NET_F_HOST_TSO4); 473 features |= (1 << VIRTIO_NET_F_HOST_TSO6); 474 features |= (1 << VIRTIO_NET_F_HOST_ECN); 475 476 return features; 477 } 478 479 static void virtio_net_apply_guest_offloads(VirtIONet *n) 480 { 481 qemu_set_offload(qemu_get_queue(n->nic)->peer, 482 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 483 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 484 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 485 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 486 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); 487 } 488 489 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) 490 { 491 static const uint64_t guest_offloads_mask = 492 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 493 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 494 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 495 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 496 (1ULL << VIRTIO_NET_F_GUEST_UFO); 497 498 return guest_offloads_mask & features; 499 } 500 501 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) 502 { 503 VirtIODevice *vdev = VIRTIO_DEVICE(n); 504 return virtio_net_guest_offloads_by_features(vdev->guest_features); 505 } 506 507 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 508 { 509 VirtIONet *n = VIRTIO_NET(vdev); 510 int i; 511 512 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); 513 514 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 515 516 if (n->has_vnet_hdr) { 517 n->curr_guest_offloads = 518 virtio_net_guest_offloads_by_features(features); 519 virtio_net_apply_guest_offloads(n); 520 } 521 522 for (i = 0; i < n->max_queues; i++) { 523 NetClientState *nc = qemu_get_subqueue(n->nic, i); 524 525 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 526 continue; 527 } 528 if (!tap_get_vhost_net(nc->peer)) { 529 continue; 530 } 531 vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); 532 } 533 534 if ((1 << VIRTIO_NET_F_CTRL_VLAN) & features) { 535 memset(n->vlans, 0, MAX_VLAN >> 3); 536 } else { 537 memset(n->vlans, 0xff, MAX_VLAN >> 3); 538 } 539 } 540 541 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 542 struct iovec *iov, unsigned int iov_cnt) 543 { 544 uint8_t on; 545 size_t s; 546 NetClientState *nc = qemu_get_queue(n->nic); 547 548 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 549 if (s != sizeof(on)) { 550 return VIRTIO_NET_ERR; 551 } 552 553 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 554 n->promisc = on; 555 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 556 n->allmulti = on; 557 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 558 n->alluni = on; 559 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 560 n->nomulti = on; 561 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 562 n->nouni = on; 563 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 564 n->nobcast = on; 565 } else { 566 return VIRTIO_NET_ERR; 567 } 568 569 rxfilter_notify(nc); 570 571 return VIRTIO_NET_OK; 572 } 573 574 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 575 struct iovec *iov, unsigned int iov_cnt) 576 { 577 VirtIODevice *vdev = VIRTIO_DEVICE(n); 578 uint64_t offloads; 579 size_t s; 580 581 if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) { 582 return VIRTIO_NET_ERR; 583 } 584 585 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 586 if (s != sizeof(offloads)) { 587 return VIRTIO_NET_ERR; 588 } 589 590 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 591 uint64_t supported_offloads; 592 593 if (!n->has_vnet_hdr) { 594 return VIRTIO_NET_ERR; 595 } 596 597 supported_offloads = virtio_net_supported_guest_offloads(n); 598 if (offloads & ~supported_offloads) { 599 return VIRTIO_NET_ERR; 600 } 601 602 n->curr_guest_offloads = offloads; 603 virtio_net_apply_guest_offloads(n); 604 605 return VIRTIO_NET_OK; 606 } else { 607 return VIRTIO_NET_ERR; 608 } 609 } 610 611 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 612 struct iovec *iov, unsigned int iov_cnt) 613 { 614 struct virtio_net_ctrl_mac mac_data; 615 size_t s; 616 NetClientState *nc = qemu_get_queue(n->nic); 617 618 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 619 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 620 return VIRTIO_NET_ERR; 621 } 622 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 623 assert(s == sizeof(n->mac)); 624 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 625 rxfilter_notify(nc); 626 627 return VIRTIO_NET_OK; 628 } 629 630 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 631 return VIRTIO_NET_ERR; 632 } 633 634 int in_use = 0; 635 int first_multi = 0; 636 uint8_t uni_overflow = 0; 637 uint8_t multi_overflow = 0; 638 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 639 640 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 641 sizeof(mac_data.entries)); 642 mac_data.entries = ldl_p(&mac_data.entries); 643 if (s != sizeof(mac_data.entries)) { 644 goto error; 645 } 646 iov_discard_front(&iov, &iov_cnt, s); 647 648 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 649 goto error; 650 } 651 652 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 653 s = iov_to_buf(iov, iov_cnt, 0, macs, 654 mac_data.entries * ETH_ALEN); 655 if (s != mac_data.entries * ETH_ALEN) { 656 goto error; 657 } 658 in_use += mac_data.entries; 659 } else { 660 uni_overflow = 1; 661 } 662 663 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 664 665 first_multi = in_use; 666 667 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 668 sizeof(mac_data.entries)); 669 mac_data.entries = ldl_p(&mac_data.entries); 670 if (s != sizeof(mac_data.entries)) { 671 goto error; 672 } 673 674 iov_discard_front(&iov, &iov_cnt, s); 675 676 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 677 goto error; 678 } 679 680 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 681 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 682 mac_data.entries * ETH_ALEN); 683 if (s != mac_data.entries * ETH_ALEN) { 684 goto error; 685 } 686 in_use += mac_data.entries; 687 } else { 688 multi_overflow = 1; 689 } 690 691 n->mac_table.in_use = in_use; 692 n->mac_table.first_multi = first_multi; 693 n->mac_table.uni_overflow = uni_overflow; 694 n->mac_table.multi_overflow = multi_overflow; 695 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 696 g_free(macs); 697 rxfilter_notify(nc); 698 699 return VIRTIO_NET_OK; 700 701 error: 702 g_free(macs); 703 return VIRTIO_NET_ERR; 704 } 705 706 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 707 struct iovec *iov, unsigned int iov_cnt) 708 { 709 uint16_t vid; 710 size_t s; 711 NetClientState *nc = qemu_get_queue(n->nic); 712 713 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 714 vid = lduw_p(&vid); 715 if (s != sizeof(vid)) { 716 return VIRTIO_NET_ERR; 717 } 718 719 if (vid >= MAX_VLAN) 720 return VIRTIO_NET_ERR; 721 722 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 723 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 724 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 725 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 726 else 727 return VIRTIO_NET_ERR; 728 729 rxfilter_notify(nc); 730 731 return VIRTIO_NET_OK; 732 } 733 734 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 735 struct iovec *iov, unsigned int iov_cnt) 736 { 737 VirtIODevice *vdev = VIRTIO_DEVICE(n); 738 struct virtio_net_ctrl_mq mq; 739 size_t s; 740 uint16_t queues; 741 742 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 743 if (s != sizeof(mq)) { 744 return VIRTIO_NET_ERR; 745 } 746 747 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 748 return VIRTIO_NET_ERR; 749 } 750 751 queues = lduw_p(&mq.virtqueue_pairs); 752 753 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 754 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 755 queues > n->max_queues || 756 !n->multiqueue) { 757 return VIRTIO_NET_ERR; 758 } 759 760 n->curr_queues = queues; 761 /* stop the backend before changing the number of queues to avoid handling a 762 * disabled queue */ 763 virtio_net_set_status(vdev, vdev->status); 764 virtio_net_set_queues(n); 765 766 return VIRTIO_NET_OK; 767 } 768 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 769 { 770 VirtIONet *n = VIRTIO_NET(vdev); 771 struct virtio_net_ctrl_hdr ctrl; 772 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 773 VirtQueueElement elem; 774 size_t s; 775 struct iovec *iov; 776 unsigned int iov_cnt; 777 778 while (virtqueue_pop(vq, &elem)) { 779 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 780 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 781 error_report("virtio-net ctrl missing headers"); 782 exit(1); 783 } 784 785 iov = elem.out_sg; 786 iov_cnt = elem.out_num; 787 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 788 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 789 if (s != sizeof(ctrl)) { 790 status = VIRTIO_NET_ERR; 791 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 792 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 793 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 794 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 795 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 796 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 797 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 798 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 799 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 800 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); 801 } 802 803 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 804 assert(s == sizeof(status)); 805 806 virtqueue_push(vq, &elem, sizeof(status)); 807 virtio_notify(vdev, vq); 808 } 809 } 810 811 /* RX */ 812 813 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 814 { 815 VirtIONet *n = VIRTIO_NET(vdev); 816 int queue_index = vq2q(virtio_get_queue_index(vq)); 817 818 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 819 } 820 821 static int virtio_net_can_receive(NetClientState *nc) 822 { 823 VirtIONet *n = qemu_get_nic_opaque(nc); 824 VirtIODevice *vdev = VIRTIO_DEVICE(n); 825 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 826 827 if (!vdev->vm_running) { 828 return 0; 829 } 830 831 if (nc->queue_index >= n->curr_queues) { 832 return 0; 833 } 834 835 if (!virtio_queue_ready(q->rx_vq) || 836 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 837 return 0; 838 } 839 840 return 1; 841 } 842 843 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 844 { 845 VirtIONet *n = q->n; 846 if (virtio_queue_empty(q->rx_vq) || 847 (n->mergeable_rx_bufs && 848 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 849 virtio_queue_set_notification(q->rx_vq, 1); 850 851 /* To avoid a race condition where the guest has made some buffers 852 * available after the above check but before notification was 853 * enabled, check for available buffers again. 854 */ 855 if (virtio_queue_empty(q->rx_vq) || 856 (n->mergeable_rx_bufs && 857 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 858 return 0; 859 } 860 } 861 862 virtio_queue_set_notification(q->rx_vq, 0); 863 return 1; 864 } 865 866 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 867 * it never finds out that the packets don't have valid checksums. This 868 * causes dhclient to get upset. Fedora's carried a patch for ages to 869 * fix this with Xen but it hasn't appeared in an upstream release of 870 * dhclient yet. 871 * 872 * To avoid breaking existing guests, we catch udp packets and add 873 * checksums. This is terrible but it's better than hacking the guest 874 * kernels. 875 * 876 * N.B. if we introduce a zero-copy API, this operation is no longer free so 877 * we should provide a mechanism to disable it to avoid polluting the host 878 * cache. 879 */ 880 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 881 uint8_t *buf, size_t size) 882 { 883 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 884 (size > 27 && size < 1500) && /* normal sized MTU */ 885 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 886 (buf[23] == 17) && /* ip.protocol == UDP */ 887 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 888 net_checksum_calculate(buf, size); 889 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 890 } 891 } 892 893 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 894 const void *buf, size_t size) 895 { 896 if (n->has_vnet_hdr) { 897 /* FIXME this cast is evil */ 898 void *wbuf = (void *)buf; 899 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 900 size - n->host_hdr_len); 901 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 902 } else { 903 struct virtio_net_hdr hdr = { 904 .flags = 0, 905 .gso_type = VIRTIO_NET_HDR_GSO_NONE 906 }; 907 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 908 } 909 } 910 911 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 912 { 913 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 914 static const uint8_t vlan[] = {0x81, 0x00}; 915 uint8_t *ptr = (uint8_t *)buf; 916 int i; 917 918 if (n->promisc) 919 return 1; 920 921 ptr += n->host_hdr_len; 922 923 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 924 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 925 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 926 return 0; 927 } 928 929 if (ptr[0] & 1) { // multicast 930 if (!memcmp(ptr, bcast, sizeof(bcast))) { 931 return !n->nobcast; 932 } else if (n->nomulti) { 933 return 0; 934 } else if (n->allmulti || n->mac_table.multi_overflow) { 935 return 1; 936 } 937 938 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 939 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 940 return 1; 941 } 942 } 943 } else { // unicast 944 if (n->nouni) { 945 return 0; 946 } else if (n->alluni || n->mac_table.uni_overflow) { 947 return 1; 948 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 949 return 1; 950 } 951 952 for (i = 0; i < n->mac_table.first_multi; i++) { 953 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 954 return 1; 955 } 956 } 957 } 958 959 return 0; 960 } 961 962 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 963 { 964 VirtIONet *n = qemu_get_nic_opaque(nc); 965 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 966 VirtIODevice *vdev = VIRTIO_DEVICE(n); 967 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 968 struct virtio_net_hdr_mrg_rxbuf mhdr; 969 unsigned mhdr_cnt = 0; 970 size_t offset, i, guest_offset; 971 972 if (!virtio_net_can_receive(nc)) { 973 return -1; 974 } 975 976 /* hdr_len refers to the header we supply to the guest */ 977 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 978 return 0; 979 } 980 981 if (!receive_filter(n, buf, size)) 982 return size; 983 984 offset = i = 0; 985 986 while (offset < size) { 987 VirtQueueElement elem; 988 int len, total; 989 const struct iovec *sg = elem.in_sg; 990 991 total = 0; 992 993 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 994 if (i == 0) 995 return -1; 996 error_report("virtio-net unexpected empty queue: " 997 "i %zd mergeable %d offset %zd, size %zd, " 998 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 999 i, n->mergeable_rx_bufs, offset, size, 1000 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 1001 exit(1); 1002 } 1003 1004 if (elem.in_num < 1) { 1005 error_report("virtio-net receive queue contains no in buffers"); 1006 exit(1); 1007 } 1008 1009 if (i == 0) { 1010 assert(offset == 0); 1011 if (n->mergeable_rx_bufs) { 1012 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1013 sg, elem.in_num, 1014 offsetof(typeof(mhdr), num_buffers), 1015 sizeof(mhdr.num_buffers)); 1016 } 1017 1018 receive_header(n, sg, elem.in_num, buf, size); 1019 offset = n->host_hdr_len; 1020 total += n->guest_hdr_len; 1021 guest_offset = n->guest_hdr_len; 1022 } else { 1023 guest_offset = 0; 1024 } 1025 1026 /* copy in packet. ugh */ 1027 len = iov_from_buf(sg, elem.in_num, guest_offset, 1028 buf + offset, size - offset); 1029 total += len; 1030 offset += len; 1031 /* If buffers can't be merged, at this point we 1032 * must have consumed the complete packet. 1033 * Otherwise, drop it. */ 1034 if (!n->mergeable_rx_bufs && offset < size) { 1035 #if 0 1036 error_report("virtio-net truncated non-mergeable packet: " 1037 "i %zd mergeable %d offset %zd, size %zd, " 1038 "guest hdr len %zd, host hdr len %zd", 1039 i, n->mergeable_rx_bufs, 1040 offset, size, n->guest_hdr_len, n->host_hdr_len); 1041 #endif 1042 return size; 1043 } 1044 1045 /* signal other side */ 1046 virtqueue_fill(q->rx_vq, &elem, total, i++); 1047 } 1048 1049 if (mhdr_cnt) { 1050 stw_p(&mhdr.num_buffers, i); 1051 iov_from_buf(mhdr_sg, mhdr_cnt, 1052 0, 1053 &mhdr.num_buffers, sizeof mhdr.num_buffers); 1054 } 1055 1056 virtqueue_flush(q->rx_vq, i); 1057 virtio_notify(vdev, q->rx_vq); 1058 1059 return size; 1060 } 1061 1062 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 1063 1064 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 1065 { 1066 VirtIONet *n = qemu_get_nic_opaque(nc); 1067 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1068 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1069 1070 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 1071 virtio_notify(vdev, q->tx_vq); 1072 1073 q->async_tx.elem.out_num = q->async_tx.len = 0; 1074 1075 virtio_queue_set_notification(q->tx_vq, 1); 1076 virtio_net_flush_tx(q); 1077 } 1078 1079 /* TX */ 1080 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 1081 { 1082 VirtIONet *n = q->n; 1083 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1084 VirtQueueElement elem; 1085 int32_t num_packets = 0; 1086 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 1087 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1088 return num_packets; 1089 } 1090 1091 assert(vdev->vm_running); 1092 1093 if (q->async_tx.elem.out_num) { 1094 virtio_queue_set_notification(q->tx_vq, 0); 1095 return num_packets; 1096 } 1097 1098 while (virtqueue_pop(q->tx_vq, &elem)) { 1099 ssize_t ret, len; 1100 unsigned int out_num = elem.out_num; 1101 struct iovec *out_sg = &elem.out_sg[0]; 1102 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 1103 1104 if (out_num < 1) { 1105 error_report("virtio-net header not in first element"); 1106 exit(1); 1107 } 1108 1109 /* 1110 * If host wants to see the guest header as is, we can 1111 * pass it on unchanged. Otherwise, copy just the parts 1112 * that host is interested in. 1113 */ 1114 assert(n->host_hdr_len <= n->guest_hdr_len); 1115 if (n->host_hdr_len != n->guest_hdr_len) { 1116 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 1117 out_sg, out_num, 1118 0, n->host_hdr_len); 1119 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 1120 out_sg, out_num, 1121 n->guest_hdr_len, -1); 1122 out_num = sg_num; 1123 out_sg = sg; 1124 } 1125 1126 len = n->guest_hdr_len; 1127 1128 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 1129 out_sg, out_num, virtio_net_tx_complete); 1130 if (ret == 0) { 1131 virtio_queue_set_notification(q->tx_vq, 0); 1132 q->async_tx.elem = elem; 1133 q->async_tx.len = len; 1134 return -EBUSY; 1135 } 1136 1137 len += ret; 1138 1139 virtqueue_push(q->tx_vq, &elem, 0); 1140 virtio_notify(vdev, q->tx_vq); 1141 1142 if (++num_packets >= n->tx_burst) { 1143 break; 1144 } 1145 } 1146 return num_packets; 1147 } 1148 1149 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 1150 { 1151 VirtIONet *n = VIRTIO_NET(vdev); 1152 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1153 1154 /* This happens when device was stopped but VCPU wasn't. */ 1155 if (!vdev->vm_running) { 1156 q->tx_waiting = 1; 1157 return; 1158 } 1159 1160 if (q->tx_waiting) { 1161 virtio_queue_set_notification(vq, 1); 1162 timer_del(q->tx_timer); 1163 q->tx_waiting = 0; 1164 virtio_net_flush_tx(q); 1165 } else { 1166 timer_mod(q->tx_timer, 1167 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 1168 q->tx_waiting = 1; 1169 virtio_queue_set_notification(vq, 0); 1170 } 1171 } 1172 1173 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 1174 { 1175 VirtIONet *n = VIRTIO_NET(vdev); 1176 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 1177 1178 if (unlikely(q->tx_waiting)) { 1179 return; 1180 } 1181 q->tx_waiting = 1; 1182 /* This happens when device was stopped but VCPU wasn't. */ 1183 if (!vdev->vm_running) { 1184 return; 1185 } 1186 virtio_queue_set_notification(vq, 0); 1187 qemu_bh_schedule(q->tx_bh); 1188 } 1189 1190 static void virtio_net_tx_timer(void *opaque) 1191 { 1192 VirtIONetQueue *q = opaque; 1193 VirtIONet *n = q->n; 1194 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1195 assert(vdev->vm_running); 1196 1197 q->tx_waiting = 0; 1198 1199 /* Just in case the driver is not ready on more */ 1200 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1201 return; 1202 } 1203 1204 virtio_queue_set_notification(q->tx_vq, 1); 1205 virtio_net_flush_tx(q); 1206 } 1207 1208 static void virtio_net_tx_bh(void *opaque) 1209 { 1210 VirtIONetQueue *q = opaque; 1211 VirtIONet *n = q->n; 1212 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1213 int32_t ret; 1214 1215 assert(vdev->vm_running); 1216 1217 q->tx_waiting = 0; 1218 1219 /* Just in case the driver is not ready on more */ 1220 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1221 return; 1222 } 1223 1224 ret = virtio_net_flush_tx(q); 1225 if (ret == -EBUSY) { 1226 return; /* Notification re-enable handled by tx_complete */ 1227 } 1228 1229 /* If we flush a full burst of packets, assume there are 1230 * more coming and immediately reschedule */ 1231 if (ret >= n->tx_burst) { 1232 qemu_bh_schedule(q->tx_bh); 1233 q->tx_waiting = 1; 1234 return; 1235 } 1236 1237 /* If less than a full burst, re-enable notification and flush 1238 * anything that may have come in while we weren't looking. If 1239 * we find something, assume the guest is still active and reschedule */ 1240 virtio_queue_set_notification(q->tx_vq, 1); 1241 if (virtio_net_flush_tx(q) > 0) { 1242 virtio_queue_set_notification(q->tx_vq, 0); 1243 qemu_bh_schedule(q->tx_bh); 1244 q->tx_waiting = 1; 1245 } 1246 } 1247 1248 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1249 { 1250 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1251 int i, max = multiqueue ? n->max_queues : 1; 1252 1253 n->multiqueue = multiqueue; 1254 1255 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1256 virtio_del_queue(vdev, i); 1257 } 1258 1259 for (i = 1; i < max; i++) { 1260 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1261 if (n->vqs[i].tx_timer) { 1262 n->vqs[i].tx_vq = 1263 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1264 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 1265 virtio_net_tx_timer, 1266 &n->vqs[i]); 1267 } else { 1268 n->vqs[i].tx_vq = 1269 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1270 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1271 } 1272 1273 n->vqs[i].tx_waiting = 0; 1274 n->vqs[i].n = n; 1275 } 1276 1277 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1278 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1279 * breaking them. 1280 */ 1281 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1282 1283 virtio_net_set_queues(n); 1284 } 1285 1286 static void virtio_net_save(QEMUFile *f, void *opaque) 1287 { 1288 int i; 1289 VirtIONet *n = opaque; 1290 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1291 1292 /* At this point, backend must be stopped, otherwise 1293 * it might keep writing to memory. */ 1294 assert(!n->vhost_started); 1295 virtio_save(vdev, f); 1296 1297 qemu_put_buffer(f, n->mac, ETH_ALEN); 1298 qemu_put_be32(f, n->vqs[0].tx_waiting); 1299 qemu_put_be32(f, n->mergeable_rx_bufs); 1300 qemu_put_be16(f, n->status); 1301 qemu_put_byte(f, n->promisc); 1302 qemu_put_byte(f, n->allmulti); 1303 qemu_put_be32(f, n->mac_table.in_use); 1304 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1305 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1306 qemu_put_be32(f, n->has_vnet_hdr); 1307 qemu_put_byte(f, n->mac_table.multi_overflow); 1308 qemu_put_byte(f, n->mac_table.uni_overflow); 1309 qemu_put_byte(f, n->alluni); 1310 qemu_put_byte(f, n->nomulti); 1311 qemu_put_byte(f, n->nouni); 1312 qemu_put_byte(f, n->nobcast); 1313 qemu_put_byte(f, n->has_ufo); 1314 if (n->max_queues > 1) { 1315 qemu_put_be16(f, n->max_queues); 1316 qemu_put_be16(f, n->curr_queues); 1317 for (i = 1; i < n->curr_queues; i++) { 1318 qemu_put_be32(f, n->vqs[i].tx_waiting); 1319 } 1320 } 1321 1322 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1323 qemu_put_be64(f, n->curr_guest_offloads); 1324 } 1325 } 1326 1327 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1328 { 1329 VirtIONet *n = opaque; 1330 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1331 int ret, i, link_down; 1332 1333 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1334 return -EINVAL; 1335 1336 ret = virtio_load(vdev, f); 1337 if (ret) { 1338 return ret; 1339 } 1340 1341 qemu_get_buffer(f, n->mac, ETH_ALEN); 1342 n->vqs[0].tx_waiting = qemu_get_be32(f); 1343 1344 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1345 1346 if (version_id >= 3) 1347 n->status = qemu_get_be16(f); 1348 1349 if (version_id >= 4) { 1350 if (version_id < 8) { 1351 n->promisc = qemu_get_be32(f); 1352 n->allmulti = qemu_get_be32(f); 1353 } else { 1354 n->promisc = qemu_get_byte(f); 1355 n->allmulti = qemu_get_byte(f); 1356 } 1357 } 1358 1359 if (version_id >= 5) { 1360 n->mac_table.in_use = qemu_get_be32(f); 1361 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1362 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1363 qemu_get_buffer(f, n->mac_table.macs, 1364 n->mac_table.in_use * ETH_ALEN); 1365 } else if (n->mac_table.in_use) { 1366 uint8_t *buf = g_malloc0(n->mac_table.in_use); 1367 qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); 1368 g_free(buf); 1369 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1370 n->mac_table.in_use = 0; 1371 } 1372 } 1373 1374 if (version_id >= 6) 1375 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1376 1377 if (version_id >= 7) { 1378 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1379 error_report("virtio-net: saved image requires vnet_hdr=on"); 1380 return -1; 1381 } 1382 } 1383 1384 if (version_id >= 9) { 1385 n->mac_table.multi_overflow = qemu_get_byte(f); 1386 n->mac_table.uni_overflow = qemu_get_byte(f); 1387 } 1388 1389 if (version_id >= 10) { 1390 n->alluni = qemu_get_byte(f); 1391 n->nomulti = qemu_get_byte(f); 1392 n->nouni = qemu_get_byte(f); 1393 n->nobcast = qemu_get_byte(f); 1394 } 1395 1396 if (version_id >= 11) { 1397 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1398 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1399 return -1; 1400 } 1401 } 1402 1403 if (n->max_queues > 1) { 1404 if (n->max_queues != qemu_get_be16(f)) { 1405 error_report("virtio-net: different max_queues "); 1406 return -1; 1407 } 1408 1409 n->curr_queues = qemu_get_be16(f); 1410 for (i = 1; i < n->curr_queues; i++) { 1411 n->vqs[i].tx_waiting = qemu_get_be32(f); 1412 } 1413 } 1414 1415 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { 1416 n->curr_guest_offloads = qemu_get_be64(f); 1417 } else { 1418 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 1419 } 1420 1421 if (peer_has_vnet_hdr(n)) { 1422 virtio_net_apply_guest_offloads(n); 1423 } 1424 1425 virtio_net_set_queues(n); 1426 1427 /* Find the first multicast entry in the saved MAC filter */ 1428 for (i = 0; i < n->mac_table.in_use; i++) { 1429 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1430 break; 1431 } 1432 } 1433 n->mac_table.first_multi = i; 1434 1435 /* nc.link_down can't be migrated, so infer link_down according 1436 * to link status bit in n->status */ 1437 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1438 for (i = 0; i < n->max_queues; i++) { 1439 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1440 } 1441 1442 return 0; 1443 } 1444 1445 static void virtio_net_cleanup(NetClientState *nc) 1446 { 1447 VirtIONet *n = qemu_get_nic_opaque(nc); 1448 1449 n->nic = NULL; 1450 } 1451 1452 static NetClientInfo net_virtio_info = { 1453 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1454 .size = sizeof(NICState), 1455 .can_receive = virtio_net_can_receive, 1456 .receive = virtio_net_receive, 1457 .cleanup = virtio_net_cleanup, 1458 .link_status_changed = virtio_net_set_link_status, 1459 .query_rx_filter = virtio_net_query_rxfilter, 1460 }; 1461 1462 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1463 { 1464 VirtIONet *n = VIRTIO_NET(vdev); 1465 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1466 assert(n->vhost_started); 1467 return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx); 1468 } 1469 1470 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1471 bool mask) 1472 { 1473 VirtIONet *n = VIRTIO_NET(vdev); 1474 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1475 assert(n->vhost_started); 1476 vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), 1477 vdev, idx, mask); 1478 } 1479 1480 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1481 { 1482 int i, config_size = 0; 1483 host_features |= (1 << VIRTIO_NET_F_MAC); 1484 for (i = 0; feature_sizes[i].flags != 0; i++) { 1485 if (host_features & feature_sizes[i].flags) { 1486 config_size = MAX(feature_sizes[i].end, config_size); 1487 } 1488 } 1489 n->config_size = config_size; 1490 } 1491 1492 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 1493 const char *type) 1494 { 1495 /* 1496 * The name can be NULL, the netclient name will be type.x. 1497 */ 1498 assert(type != NULL); 1499 1500 if (n->netclient_name) { 1501 g_free(n->netclient_name); 1502 n->netclient_name = NULL; 1503 } 1504 if (n->netclient_type) { 1505 g_free(n->netclient_type); 1506 n->netclient_type = NULL; 1507 } 1508 1509 if (name != NULL) { 1510 n->netclient_name = g_strdup(name); 1511 } 1512 n->netclient_type = g_strdup(type); 1513 } 1514 1515 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 1516 { 1517 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1518 VirtIONet *n = VIRTIO_NET(dev); 1519 NetClientState *nc; 1520 int i; 1521 1522 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 1523 1524 n->max_queues = MAX(n->nic_conf.queues, 1); 1525 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1526 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1527 n->curr_queues = 1; 1528 n->vqs[0].n = n; 1529 n->tx_timeout = n->net_conf.txtimer; 1530 1531 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1532 && strcmp(n->net_conf.tx, "bh")) { 1533 error_report("virtio-net: " 1534 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1535 n->net_conf.tx); 1536 error_report("Defaulting to \"bh\""); 1537 } 1538 1539 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1540 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1541 virtio_net_handle_tx_timer); 1542 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, 1543 &n->vqs[0]); 1544 } else { 1545 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1546 virtio_net_handle_tx_bh); 1547 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1548 } 1549 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1550 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1551 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1552 n->status = VIRTIO_NET_S_LINK_UP; 1553 1554 if (n->netclient_type) { 1555 /* 1556 * Happen when virtio_net_set_netclient_name has been called. 1557 */ 1558 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1559 n->netclient_type, n->netclient_name, n); 1560 } else { 1561 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1562 object_get_typename(OBJECT(dev)), dev->id, n); 1563 } 1564 1565 peer_test_vnet_hdr(n); 1566 if (peer_has_vnet_hdr(n)) { 1567 for (i = 0; i < n->max_queues; i++) { 1568 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1569 } 1570 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1571 } else { 1572 n->host_hdr_len = 0; 1573 } 1574 1575 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1576 1577 n->vqs[0].tx_waiting = 0; 1578 n->tx_burst = n->net_conf.txburst; 1579 virtio_net_set_mrg_rx_bufs(n, 0); 1580 n->promisc = 1; /* for compatibility */ 1581 1582 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1583 1584 n->vlans = g_malloc0(MAX_VLAN >> 3); 1585 1586 nc = qemu_get_queue(n->nic); 1587 nc->rxfilter_notify_enabled = 1; 1588 1589 n->qdev = dev; 1590 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1591 virtio_net_save, virtio_net_load, n); 1592 1593 add_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0"); 1594 } 1595 1596 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) 1597 { 1598 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1599 VirtIONet *n = VIRTIO_NET(dev); 1600 int i; 1601 1602 /* This will stop vhost backend if appropriate. */ 1603 virtio_net_set_status(vdev, 0); 1604 1605 unregister_savevm(dev, "virtio-net", n); 1606 1607 if (n->netclient_name) { 1608 g_free(n->netclient_name); 1609 n->netclient_name = NULL; 1610 } 1611 if (n->netclient_type) { 1612 g_free(n->netclient_type); 1613 n->netclient_type = NULL; 1614 } 1615 1616 g_free(n->mac_table.macs); 1617 g_free(n->vlans); 1618 1619 for (i = 0; i < n->max_queues; i++) { 1620 VirtIONetQueue *q = &n->vqs[i]; 1621 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1622 1623 qemu_purge_queued_packets(nc); 1624 1625 if (q->tx_timer) { 1626 timer_del(q->tx_timer); 1627 timer_free(q->tx_timer); 1628 } else if (q->tx_bh) { 1629 qemu_bh_delete(q->tx_bh); 1630 } 1631 } 1632 1633 g_free(n->vqs); 1634 qemu_del_nic(n->nic); 1635 virtio_cleanup(vdev); 1636 } 1637 1638 static void virtio_net_instance_init(Object *obj) 1639 { 1640 VirtIONet *n = VIRTIO_NET(obj); 1641 1642 /* 1643 * The default config_size is sizeof(struct virtio_net_config). 1644 * Can be overriden with virtio_net_set_config_size. 1645 */ 1646 n->config_size = sizeof(struct virtio_net_config); 1647 } 1648 1649 static Property virtio_net_properties[] = { 1650 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1651 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1652 TX_TIMER_INTERVAL), 1653 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1654 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1655 DEFINE_PROP_END_OF_LIST(), 1656 }; 1657 1658 static void virtio_net_class_init(ObjectClass *klass, void *data) 1659 { 1660 DeviceClass *dc = DEVICE_CLASS(klass); 1661 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1662 1663 dc->props = virtio_net_properties; 1664 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 1665 vdc->realize = virtio_net_device_realize; 1666 vdc->unrealize = virtio_net_device_unrealize; 1667 vdc->get_config = virtio_net_get_config; 1668 vdc->set_config = virtio_net_set_config; 1669 vdc->get_features = virtio_net_get_features; 1670 vdc->set_features = virtio_net_set_features; 1671 vdc->bad_features = virtio_net_bad_features; 1672 vdc->reset = virtio_net_reset; 1673 vdc->set_status = virtio_net_set_status; 1674 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1675 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1676 } 1677 1678 static const TypeInfo virtio_net_info = { 1679 .name = TYPE_VIRTIO_NET, 1680 .parent = TYPE_VIRTIO_DEVICE, 1681 .instance_size = sizeof(VirtIONet), 1682 .instance_init = virtio_net_instance_init, 1683 .class_init = virtio_net_class_init, 1684 }; 1685 1686 static void virtio_register_types(void) 1687 { 1688 type_register_static(&virtio_net_info); 1689 } 1690 1691 type_init(virtio_register_types) 1692