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