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