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 24 #define VIRTIO_NET_VM_VERSION 11 25 26 #define MAC_TABLE_ENTRIES 64 27 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 28 29 /* 30 * Calculate the number of bytes up to and including the given 'field' of 31 * 'container'. 32 */ 33 #define endof(container, field) \ 34 (offsetof(container, field) + sizeof(((container *)0)->field)) 35 36 typedef struct VirtIOFeature { 37 uint32_t flags; 38 size_t end; 39 } VirtIOFeature; 40 41 static VirtIOFeature feature_sizes[] = { 42 {.flags = 1 << VIRTIO_NET_F_MAC, 43 .end = endof(struct virtio_net_config, mac)}, 44 {.flags = 1 << VIRTIO_NET_F_STATUS, 45 .end = endof(struct virtio_net_config, status)}, 46 {.flags = 1 << VIRTIO_NET_F_MQ, 47 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 48 {} 49 }; 50 51 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 52 { 53 VirtIONet *n = qemu_get_nic_opaque(nc); 54 55 return &n->vqs[nc->queue_index]; 56 } 57 58 static int vq2q(int queue_index) 59 { 60 return queue_index / 2; 61 } 62 63 /* TODO 64 * - we could suppress RX interrupt if we were so inclined. 65 */ 66 67 static VirtIONet *to_virtio_net(VirtIODevice *vdev) 68 { 69 return (VirtIONet *)vdev; 70 } 71 72 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 73 { 74 VirtIONet *n = to_virtio_net(vdev); 75 struct virtio_net_config netcfg; 76 77 stw_p(&netcfg.status, n->status); 78 stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); 79 memcpy(netcfg.mac, n->mac, ETH_ALEN); 80 memcpy(config, &netcfg, n->config_size); 81 } 82 83 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 84 { 85 VirtIONet *n = to_virtio_net(vdev); 86 struct virtio_net_config netcfg = {}; 87 88 memcpy(&netcfg, config, n->config_size); 89 90 if (!(n->vdev.guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && 91 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 92 memcpy(n->mac, netcfg.mac, ETH_ALEN); 93 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 94 } 95 } 96 97 static bool virtio_net_started(VirtIONet *n, uint8_t status) 98 { 99 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 100 (n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running; 101 } 102 103 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 104 { 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 == virtio_net_started(n, status) && 120 !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), &n->vdev)) { 126 return; 127 } 128 n->vhost_started = 1; 129 r = vhost_net_start(&n->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(&n->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 = to_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 qemu_mod_timer(q->tx_timer, 166 qemu_get_clock_ns(vm_clock) + n->tx_timeout); 167 } else { 168 qemu_bh_schedule(q->tx_bh); 169 } 170 } else { 171 if (q->tx_timer) { 172 qemu_del_timer(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 uint16_t old_status = n->status; 184 185 if (nc->link_down) 186 n->status &= ~VIRTIO_NET_S_LINK_UP; 187 else 188 n->status |= VIRTIO_NET_S_LINK_UP; 189 190 if (n->status != old_status) 191 virtio_notify_config(&n->vdev); 192 193 virtio_net_set_status(&n->vdev, n->vdev.status); 194 } 195 196 static void virtio_net_reset(VirtIODevice *vdev) 197 { 198 VirtIONet *n = to_virtio_net(vdev); 199 200 /* Reset back to compatibility mode */ 201 n->promisc = 1; 202 n->allmulti = 0; 203 n->alluni = 0; 204 n->nomulti = 0; 205 n->nouni = 0; 206 n->nobcast = 0; 207 /* multiqueue is disabled by default */ 208 n->curr_queues = 1; 209 210 /* Flush any MAC and VLAN filter table state */ 211 n->mac_table.in_use = 0; 212 n->mac_table.first_multi = 0; 213 n->mac_table.multi_overflow = 0; 214 n->mac_table.uni_overflow = 0; 215 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 216 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 217 memset(n->vlans, 0, MAX_VLAN >> 3); 218 } 219 220 static void peer_test_vnet_hdr(VirtIONet *n) 221 { 222 NetClientState *nc = qemu_get_queue(n->nic); 223 if (!nc->peer) { 224 return; 225 } 226 227 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 228 return; 229 } 230 231 n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer); 232 } 233 234 static int peer_has_vnet_hdr(VirtIONet *n) 235 { 236 return n->has_vnet_hdr; 237 } 238 239 static int peer_has_ufo(VirtIONet *n) 240 { 241 if (!peer_has_vnet_hdr(n)) 242 return 0; 243 244 n->has_ufo = tap_has_ufo(qemu_get_queue(n->nic)->peer); 245 246 return n->has_ufo; 247 } 248 249 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 250 { 251 int i; 252 NetClientState *nc; 253 254 n->mergeable_rx_bufs = mergeable_rx_bufs; 255 256 n->guest_hdr_len = n->mergeable_rx_bufs ? 257 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 258 259 for (i = 0; i < n->max_queues; i++) { 260 nc = qemu_get_subqueue(n->nic, i); 261 262 if (peer_has_vnet_hdr(n) && 263 tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 264 tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 265 n->host_hdr_len = n->guest_hdr_len; 266 } 267 } 268 } 269 270 static int peer_attach(VirtIONet *n, int index) 271 { 272 NetClientState *nc = qemu_get_subqueue(n->nic, index); 273 274 if (!nc->peer) { 275 return 0; 276 } 277 278 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 279 return 0; 280 } 281 282 return tap_enable(nc->peer); 283 } 284 285 static int peer_detach(VirtIONet *n, int index) 286 { 287 NetClientState *nc = qemu_get_subqueue(n->nic, index); 288 289 if (!nc->peer) { 290 return 0; 291 } 292 293 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 294 return 0; 295 } 296 297 return tap_disable(nc->peer); 298 } 299 300 static void virtio_net_set_queues(VirtIONet *n) 301 { 302 int i; 303 304 for (i = 0; i < n->max_queues; i++) { 305 if (i < n->curr_queues) { 306 assert(!peer_attach(n, i)); 307 } else { 308 assert(!peer_detach(n, i)); 309 } 310 } 311 } 312 313 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl); 314 315 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 316 { 317 VirtIONet *n = to_virtio_net(vdev); 318 NetClientState *nc = qemu_get_queue(n->nic); 319 320 features |= (1 << VIRTIO_NET_F_MAC); 321 322 if (!peer_has_vnet_hdr(n)) { 323 features &= ~(0x1 << VIRTIO_NET_F_CSUM); 324 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); 325 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); 326 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); 327 328 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); 329 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); 330 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); 331 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); 332 } 333 334 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 335 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); 336 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); 337 } 338 339 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 340 return features; 341 } 342 if (!tap_get_vhost_net(nc->peer)) { 343 return features; 344 } 345 return vhost_net_get_features(tap_get_vhost_net(nc->peer), features); 346 } 347 348 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 349 { 350 uint32_t features = 0; 351 352 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 353 * but also these: */ 354 features |= (1 << VIRTIO_NET_F_MAC); 355 features |= (1 << VIRTIO_NET_F_CSUM); 356 features |= (1 << VIRTIO_NET_F_HOST_TSO4); 357 features |= (1 << VIRTIO_NET_F_HOST_TSO6); 358 features |= (1 << VIRTIO_NET_F_HOST_ECN); 359 360 return features; 361 } 362 363 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 364 { 365 VirtIONet *n = to_virtio_net(vdev); 366 int i; 367 368 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)), 369 !!(features & (1 << VIRTIO_NET_F_CTRL_VQ))); 370 371 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 372 373 if (n->has_vnet_hdr) { 374 tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer, 375 (features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 376 (features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 377 (features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 378 (features >> VIRTIO_NET_F_GUEST_ECN) & 1, 379 (features >> VIRTIO_NET_F_GUEST_UFO) & 1); 380 } 381 382 for (i = 0; i < n->max_queues; i++) { 383 NetClientState *nc = qemu_get_subqueue(n->nic, i); 384 385 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 386 continue; 387 } 388 if (!tap_get_vhost_net(nc->peer)) { 389 continue; 390 } 391 vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); 392 } 393 } 394 395 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 396 struct iovec *iov, unsigned int iov_cnt) 397 { 398 uint8_t on; 399 size_t s; 400 401 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 402 if (s != sizeof(on)) { 403 return VIRTIO_NET_ERR; 404 } 405 406 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 407 n->promisc = on; 408 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 409 n->allmulti = on; 410 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 411 n->alluni = on; 412 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 413 n->nomulti = on; 414 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 415 n->nouni = on; 416 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 417 n->nobcast = on; 418 } else { 419 return VIRTIO_NET_ERR; 420 } 421 422 return VIRTIO_NET_OK; 423 } 424 425 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 426 struct iovec *iov, unsigned int iov_cnt) 427 { 428 struct virtio_net_ctrl_mac mac_data; 429 size_t s; 430 431 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 432 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 433 return VIRTIO_NET_ERR; 434 } 435 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 436 assert(s == sizeof(n->mac)); 437 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 438 return VIRTIO_NET_OK; 439 } 440 441 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 442 return VIRTIO_NET_ERR; 443 } 444 445 n->mac_table.in_use = 0; 446 n->mac_table.first_multi = 0; 447 n->mac_table.uni_overflow = 0; 448 n->mac_table.multi_overflow = 0; 449 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 450 451 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 452 sizeof(mac_data.entries)); 453 mac_data.entries = ldl_p(&mac_data.entries); 454 if (s != sizeof(mac_data.entries)) { 455 return VIRTIO_NET_ERR; 456 } 457 iov_discard_front(&iov, &iov_cnt, s); 458 459 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 460 return VIRTIO_NET_ERR; 461 } 462 463 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 464 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 465 mac_data.entries * ETH_ALEN); 466 if (s != mac_data.entries * ETH_ALEN) { 467 return VIRTIO_NET_ERR; 468 } 469 n->mac_table.in_use += mac_data.entries; 470 } else { 471 n->mac_table.uni_overflow = 1; 472 } 473 474 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 475 476 n->mac_table.first_multi = n->mac_table.in_use; 477 478 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 479 sizeof(mac_data.entries)); 480 mac_data.entries = ldl_p(&mac_data.entries); 481 if (s != sizeof(mac_data.entries)) { 482 return VIRTIO_NET_ERR; 483 } 484 485 iov_discard_front(&iov, &iov_cnt, s); 486 487 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 488 return VIRTIO_NET_ERR; 489 } 490 491 if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) { 492 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 493 mac_data.entries * ETH_ALEN); 494 if (s != mac_data.entries * ETH_ALEN) { 495 return VIRTIO_NET_ERR; 496 } 497 n->mac_table.in_use += mac_data.entries; 498 } else { 499 n->mac_table.multi_overflow = 1; 500 } 501 502 return VIRTIO_NET_OK; 503 } 504 505 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 506 struct iovec *iov, unsigned int iov_cnt) 507 { 508 uint16_t vid; 509 size_t s; 510 511 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 512 vid = lduw_p(&vid); 513 if (s != sizeof(vid)) { 514 return VIRTIO_NET_ERR; 515 } 516 517 if (vid >= MAX_VLAN) 518 return VIRTIO_NET_ERR; 519 520 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 521 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 522 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 523 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 524 else 525 return VIRTIO_NET_ERR; 526 527 return VIRTIO_NET_OK; 528 } 529 530 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 531 struct iovec *iov, unsigned int iov_cnt) 532 { 533 struct virtio_net_ctrl_mq mq; 534 size_t s; 535 uint16_t queues; 536 537 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 538 if (s != sizeof(mq)) { 539 return VIRTIO_NET_ERR; 540 } 541 542 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 543 return VIRTIO_NET_ERR; 544 } 545 546 queues = lduw_p(&mq.virtqueue_pairs); 547 548 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 549 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 550 queues > n->max_queues || 551 !n->multiqueue) { 552 return VIRTIO_NET_ERR; 553 } 554 555 n->curr_queues = queues; 556 /* stop the backend before changing the number of queues to avoid handling a 557 * disabled queue */ 558 virtio_net_set_status(&n->vdev, n->vdev.status); 559 virtio_net_set_queues(n); 560 561 return VIRTIO_NET_OK; 562 } 563 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 564 { 565 VirtIONet *n = to_virtio_net(vdev); 566 struct virtio_net_ctrl_hdr ctrl; 567 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 568 VirtQueueElement elem; 569 size_t s; 570 struct iovec *iov; 571 unsigned int iov_cnt; 572 573 while (virtqueue_pop(vq, &elem)) { 574 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 575 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 576 error_report("virtio-net ctrl missing headers"); 577 exit(1); 578 } 579 580 iov = elem.out_sg; 581 iov_cnt = elem.out_num; 582 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 583 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 584 if (s != sizeof(ctrl)) { 585 status = VIRTIO_NET_ERR; 586 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 587 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 588 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 589 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 590 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 591 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 592 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 593 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 594 } 595 596 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 597 assert(s == sizeof(status)); 598 599 virtqueue_push(vq, &elem, sizeof(status)); 600 virtio_notify(vdev, vq); 601 } 602 } 603 604 /* RX */ 605 606 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 607 { 608 VirtIONet *n = to_virtio_net(vdev); 609 int queue_index = vq2q(virtio_get_queue_index(vq)); 610 611 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 612 } 613 614 static int virtio_net_can_receive(NetClientState *nc) 615 { 616 VirtIONet *n = qemu_get_nic_opaque(nc); 617 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 618 619 if (!n->vdev.vm_running) { 620 return 0; 621 } 622 623 if (nc->queue_index >= n->curr_queues) { 624 return 0; 625 } 626 627 if (!virtio_queue_ready(q->rx_vq) || 628 !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { 629 return 0; 630 } 631 632 return 1; 633 } 634 635 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 636 { 637 VirtIONet *n = q->n; 638 if (virtio_queue_empty(q->rx_vq) || 639 (n->mergeable_rx_bufs && 640 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 641 virtio_queue_set_notification(q->rx_vq, 1); 642 643 /* To avoid a race condition where the guest has made some buffers 644 * available after the above check but before notification was 645 * enabled, check for available buffers again. 646 */ 647 if (virtio_queue_empty(q->rx_vq) || 648 (n->mergeable_rx_bufs && 649 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 650 return 0; 651 } 652 } 653 654 virtio_queue_set_notification(q->rx_vq, 0); 655 return 1; 656 } 657 658 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 659 * it never finds out that the packets don't have valid checksums. This 660 * causes dhclient to get upset. Fedora's carried a patch for ages to 661 * fix this with Xen but it hasn't appeared in an upstream release of 662 * dhclient yet. 663 * 664 * To avoid breaking existing guests, we catch udp packets and add 665 * checksums. This is terrible but it's better than hacking the guest 666 * kernels. 667 * 668 * N.B. if we introduce a zero-copy API, this operation is no longer free so 669 * we should provide a mechanism to disable it to avoid polluting the host 670 * cache. 671 */ 672 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 673 uint8_t *buf, size_t size) 674 { 675 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 676 (size > 27 && size < 1500) && /* normal sized MTU */ 677 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 678 (buf[23] == 17) && /* ip.protocol == UDP */ 679 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 680 net_checksum_calculate(buf, size); 681 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 682 } 683 } 684 685 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 686 const void *buf, size_t size) 687 { 688 if (n->has_vnet_hdr) { 689 /* FIXME this cast is evil */ 690 void *wbuf = (void *)buf; 691 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 692 size - n->host_hdr_len); 693 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 694 } else { 695 struct virtio_net_hdr hdr = { 696 .flags = 0, 697 .gso_type = VIRTIO_NET_HDR_GSO_NONE 698 }; 699 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 700 } 701 } 702 703 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 704 { 705 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 706 static const uint8_t vlan[] = {0x81, 0x00}; 707 uint8_t *ptr = (uint8_t *)buf; 708 int i; 709 710 if (n->promisc) 711 return 1; 712 713 ptr += n->host_hdr_len; 714 715 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 716 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 717 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 718 return 0; 719 } 720 721 if (ptr[0] & 1) { // multicast 722 if (!memcmp(ptr, bcast, sizeof(bcast))) { 723 return !n->nobcast; 724 } else if (n->nomulti) { 725 return 0; 726 } else if (n->allmulti || n->mac_table.multi_overflow) { 727 return 1; 728 } 729 730 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 731 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 732 return 1; 733 } 734 } 735 } else { // unicast 736 if (n->nouni) { 737 return 0; 738 } else if (n->alluni || n->mac_table.uni_overflow) { 739 return 1; 740 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 741 return 1; 742 } 743 744 for (i = 0; i < n->mac_table.first_multi; i++) { 745 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 746 return 1; 747 } 748 } 749 } 750 751 return 0; 752 } 753 754 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 755 { 756 VirtIONet *n = qemu_get_nic_opaque(nc); 757 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 758 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 759 struct virtio_net_hdr_mrg_rxbuf mhdr; 760 unsigned mhdr_cnt = 0; 761 size_t offset, i, guest_offset; 762 763 if (!virtio_net_can_receive(nc)) { 764 return -1; 765 } 766 767 /* hdr_len refers to the header we supply to the guest */ 768 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 769 return 0; 770 } 771 772 if (!receive_filter(n, buf, size)) 773 return size; 774 775 offset = i = 0; 776 777 while (offset < size) { 778 VirtQueueElement elem; 779 int len, total; 780 const struct iovec *sg = elem.in_sg; 781 782 total = 0; 783 784 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 785 if (i == 0) 786 return -1; 787 error_report("virtio-net unexpected empty queue: " 788 "i %zd mergeable %d offset %zd, size %zd, " 789 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 790 i, n->mergeable_rx_bufs, offset, size, 791 n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); 792 exit(1); 793 } 794 795 if (elem.in_num < 1) { 796 error_report("virtio-net receive queue contains no in buffers"); 797 exit(1); 798 } 799 800 if (i == 0) { 801 assert(offset == 0); 802 if (n->mergeable_rx_bufs) { 803 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 804 sg, elem.in_num, 805 offsetof(typeof(mhdr), num_buffers), 806 sizeof(mhdr.num_buffers)); 807 } 808 809 receive_header(n, sg, elem.in_num, buf, size); 810 offset = n->host_hdr_len; 811 total += n->guest_hdr_len; 812 guest_offset = n->guest_hdr_len; 813 } else { 814 guest_offset = 0; 815 } 816 817 /* copy in packet. ugh */ 818 len = iov_from_buf(sg, elem.in_num, guest_offset, 819 buf + offset, size - offset); 820 total += len; 821 offset += len; 822 /* If buffers can't be merged, at this point we 823 * must have consumed the complete packet. 824 * Otherwise, drop it. */ 825 if (!n->mergeable_rx_bufs && offset < size) { 826 #if 0 827 error_report("virtio-net truncated non-mergeable packet: " 828 "i %zd mergeable %d offset %zd, size %zd, " 829 "guest hdr len %zd, host hdr len %zd", 830 i, n->mergeable_rx_bufs, 831 offset, size, n->guest_hdr_len, n->host_hdr_len); 832 #endif 833 return size; 834 } 835 836 /* signal other side */ 837 virtqueue_fill(q->rx_vq, &elem, total, i++); 838 } 839 840 if (mhdr_cnt) { 841 stw_p(&mhdr.num_buffers, i); 842 iov_from_buf(mhdr_sg, mhdr_cnt, 843 0, 844 &mhdr.num_buffers, sizeof mhdr.num_buffers); 845 } 846 847 virtqueue_flush(q->rx_vq, i); 848 virtio_notify(&n->vdev, q->rx_vq); 849 850 return size; 851 } 852 853 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 854 855 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 856 { 857 VirtIONet *n = qemu_get_nic_opaque(nc); 858 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 859 860 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 861 virtio_notify(&n->vdev, q->tx_vq); 862 863 q->async_tx.elem.out_num = q->async_tx.len = 0; 864 865 virtio_queue_set_notification(q->tx_vq, 1); 866 virtio_net_flush_tx(q); 867 } 868 869 /* TX */ 870 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 871 { 872 VirtIONet *n = q->n; 873 VirtQueueElement elem; 874 int32_t num_packets = 0; 875 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 876 if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { 877 return num_packets; 878 } 879 880 assert(n->vdev.vm_running); 881 882 if (q->async_tx.elem.out_num) { 883 virtio_queue_set_notification(q->tx_vq, 0); 884 return num_packets; 885 } 886 887 while (virtqueue_pop(q->tx_vq, &elem)) { 888 ssize_t ret, len; 889 unsigned int out_num = elem.out_num; 890 struct iovec *out_sg = &elem.out_sg[0]; 891 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 892 893 if (out_num < 1) { 894 error_report("virtio-net header not in first element"); 895 exit(1); 896 } 897 898 /* 899 * If host wants to see the guest header as is, we can 900 * pass it on unchanged. Otherwise, copy just the parts 901 * that host is interested in. 902 */ 903 assert(n->host_hdr_len <= n->guest_hdr_len); 904 if (n->host_hdr_len != n->guest_hdr_len) { 905 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 906 out_sg, out_num, 907 0, n->host_hdr_len); 908 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 909 out_sg, out_num, 910 n->guest_hdr_len, -1); 911 out_num = sg_num; 912 out_sg = sg; 913 } 914 915 len = n->guest_hdr_len; 916 917 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 918 out_sg, out_num, virtio_net_tx_complete); 919 if (ret == 0) { 920 virtio_queue_set_notification(q->tx_vq, 0); 921 q->async_tx.elem = elem; 922 q->async_tx.len = len; 923 return -EBUSY; 924 } 925 926 len += ret; 927 928 virtqueue_push(q->tx_vq, &elem, 0); 929 virtio_notify(&n->vdev, q->tx_vq); 930 931 if (++num_packets >= n->tx_burst) { 932 break; 933 } 934 } 935 return num_packets; 936 } 937 938 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 939 { 940 VirtIONet *n = to_virtio_net(vdev); 941 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 942 943 /* This happens when device was stopped but VCPU wasn't. */ 944 if (!n->vdev.vm_running) { 945 q->tx_waiting = 1; 946 return; 947 } 948 949 if (q->tx_waiting) { 950 virtio_queue_set_notification(vq, 1); 951 qemu_del_timer(q->tx_timer); 952 q->tx_waiting = 0; 953 virtio_net_flush_tx(q); 954 } else { 955 qemu_mod_timer(q->tx_timer, 956 qemu_get_clock_ns(vm_clock) + n->tx_timeout); 957 q->tx_waiting = 1; 958 virtio_queue_set_notification(vq, 0); 959 } 960 } 961 962 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 963 { 964 VirtIONet *n = to_virtio_net(vdev); 965 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 966 967 if (unlikely(q->tx_waiting)) { 968 return; 969 } 970 q->tx_waiting = 1; 971 /* This happens when device was stopped but VCPU wasn't. */ 972 if (!n->vdev.vm_running) { 973 return; 974 } 975 virtio_queue_set_notification(vq, 0); 976 qemu_bh_schedule(q->tx_bh); 977 } 978 979 static void virtio_net_tx_timer(void *opaque) 980 { 981 VirtIONetQueue *q = opaque; 982 VirtIONet *n = q->n; 983 assert(n->vdev.vm_running); 984 985 q->tx_waiting = 0; 986 987 /* Just in case the driver is not ready on more */ 988 if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) 989 return; 990 991 virtio_queue_set_notification(q->tx_vq, 1); 992 virtio_net_flush_tx(q); 993 } 994 995 static void virtio_net_tx_bh(void *opaque) 996 { 997 VirtIONetQueue *q = opaque; 998 VirtIONet *n = q->n; 999 int32_t ret; 1000 1001 assert(n->vdev.vm_running); 1002 1003 q->tx_waiting = 0; 1004 1005 /* Just in case the driver is not ready on more */ 1006 if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))) 1007 return; 1008 1009 ret = virtio_net_flush_tx(q); 1010 if (ret == -EBUSY) { 1011 return; /* Notification re-enable handled by tx_complete */ 1012 } 1013 1014 /* If we flush a full burst of packets, assume there are 1015 * more coming and immediately reschedule */ 1016 if (ret >= n->tx_burst) { 1017 qemu_bh_schedule(q->tx_bh); 1018 q->tx_waiting = 1; 1019 return; 1020 } 1021 1022 /* If less than a full burst, re-enable notification and flush 1023 * anything that may have come in while we weren't looking. If 1024 * we find something, assume the guest is still active and reschedule */ 1025 virtio_queue_set_notification(q->tx_vq, 1); 1026 if (virtio_net_flush_tx(q) > 0) { 1027 virtio_queue_set_notification(q->tx_vq, 0); 1028 qemu_bh_schedule(q->tx_bh); 1029 q->tx_waiting = 1; 1030 } 1031 } 1032 1033 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) 1034 { 1035 VirtIODevice *vdev = &n->vdev; 1036 int i, max = multiqueue ? n->max_queues : 1; 1037 1038 n->multiqueue = multiqueue; 1039 1040 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1041 virtio_del_queue(vdev, i); 1042 } 1043 1044 for (i = 1; i < max; i++) { 1045 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1046 if (n->vqs[i].tx_timer) { 1047 n->vqs[i].tx_vq = 1048 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1049 n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, 1050 virtio_net_tx_timer, 1051 &n->vqs[i]); 1052 } else { 1053 n->vqs[i].tx_vq = 1054 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1055 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1056 } 1057 1058 n->vqs[i].tx_waiting = 0; 1059 n->vqs[i].n = n; 1060 } 1061 1062 if (ctrl) { 1063 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1064 } 1065 1066 virtio_net_set_queues(n); 1067 } 1068 1069 static void virtio_net_save(QEMUFile *f, void *opaque) 1070 { 1071 int i; 1072 VirtIONet *n = opaque; 1073 1074 /* At this point, backend must be stopped, otherwise 1075 * it might keep writing to memory. */ 1076 assert(!n->vhost_started); 1077 virtio_save(&n->vdev, f); 1078 1079 qemu_put_buffer(f, n->mac, ETH_ALEN); 1080 qemu_put_be32(f, n->vqs[0].tx_waiting); 1081 qemu_put_be32(f, n->mergeable_rx_bufs); 1082 qemu_put_be16(f, n->status); 1083 qemu_put_byte(f, n->promisc); 1084 qemu_put_byte(f, n->allmulti); 1085 qemu_put_be32(f, n->mac_table.in_use); 1086 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1087 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1088 qemu_put_be32(f, n->has_vnet_hdr); 1089 qemu_put_byte(f, n->mac_table.multi_overflow); 1090 qemu_put_byte(f, n->mac_table.uni_overflow); 1091 qemu_put_byte(f, n->alluni); 1092 qemu_put_byte(f, n->nomulti); 1093 qemu_put_byte(f, n->nouni); 1094 qemu_put_byte(f, n->nobcast); 1095 qemu_put_byte(f, n->has_ufo); 1096 if (n->max_queues > 1) { 1097 qemu_put_be16(f, n->max_queues); 1098 qemu_put_be16(f, n->curr_queues); 1099 for (i = 1; i < n->curr_queues; i++) { 1100 qemu_put_be32(f, n->vqs[i].tx_waiting); 1101 } 1102 } 1103 } 1104 1105 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1106 { 1107 VirtIONet *n = opaque; 1108 int ret, i, link_down; 1109 1110 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1111 return -EINVAL; 1112 1113 ret = virtio_load(&n->vdev, f); 1114 if (ret) { 1115 return ret; 1116 } 1117 1118 qemu_get_buffer(f, n->mac, ETH_ALEN); 1119 n->vqs[0].tx_waiting = qemu_get_be32(f); 1120 1121 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1122 1123 if (version_id >= 3) 1124 n->status = qemu_get_be16(f); 1125 1126 if (version_id >= 4) { 1127 if (version_id < 8) { 1128 n->promisc = qemu_get_be32(f); 1129 n->allmulti = qemu_get_be32(f); 1130 } else { 1131 n->promisc = qemu_get_byte(f); 1132 n->allmulti = qemu_get_byte(f); 1133 } 1134 } 1135 1136 if (version_id >= 5) { 1137 n->mac_table.in_use = qemu_get_be32(f); 1138 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1139 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1140 qemu_get_buffer(f, n->mac_table.macs, 1141 n->mac_table.in_use * ETH_ALEN); 1142 } else if (n->mac_table.in_use) { 1143 uint8_t *buf = g_malloc0(n->mac_table.in_use); 1144 qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); 1145 g_free(buf); 1146 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1147 n->mac_table.in_use = 0; 1148 } 1149 } 1150 1151 if (version_id >= 6) 1152 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1153 1154 if (version_id >= 7) { 1155 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1156 error_report("virtio-net: saved image requires vnet_hdr=on"); 1157 return -1; 1158 } 1159 1160 if (n->has_vnet_hdr) { 1161 tap_set_offload(qemu_get_queue(n->nic)->peer, 1162 (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 1163 (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 1164 (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 1165 (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1, 1166 (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1); 1167 } 1168 } 1169 1170 if (version_id >= 9) { 1171 n->mac_table.multi_overflow = qemu_get_byte(f); 1172 n->mac_table.uni_overflow = qemu_get_byte(f); 1173 } 1174 1175 if (version_id >= 10) { 1176 n->alluni = qemu_get_byte(f); 1177 n->nomulti = qemu_get_byte(f); 1178 n->nouni = qemu_get_byte(f); 1179 n->nobcast = qemu_get_byte(f); 1180 } 1181 1182 if (version_id >= 11) { 1183 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1184 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1185 return -1; 1186 } 1187 } 1188 1189 if (n->max_queues > 1) { 1190 if (n->max_queues != qemu_get_be16(f)) { 1191 error_report("virtio-net: different max_queues "); 1192 return -1; 1193 } 1194 1195 n->curr_queues = qemu_get_be16(f); 1196 for (i = 1; i < n->curr_queues; i++) { 1197 n->vqs[i].tx_waiting = qemu_get_be32(f); 1198 } 1199 } 1200 1201 virtio_net_set_queues(n); 1202 1203 /* Find the first multicast entry in the saved MAC filter */ 1204 for (i = 0; i < n->mac_table.in_use; i++) { 1205 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1206 break; 1207 } 1208 } 1209 n->mac_table.first_multi = i; 1210 1211 /* nc.link_down can't be migrated, so infer link_down according 1212 * to link status bit in n->status */ 1213 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1214 for (i = 0; i < n->max_queues; i++) { 1215 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1216 } 1217 1218 return 0; 1219 } 1220 1221 static void virtio_net_cleanup(NetClientState *nc) 1222 { 1223 VirtIONet *n = qemu_get_nic_opaque(nc); 1224 1225 n->nic = NULL; 1226 } 1227 1228 static NetClientInfo net_virtio_info = { 1229 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1230 .size = sizeof(NICState), 1231 .can_receive = virtio_net_can_receive, 1232 .receive = virtio_net_receive, 1233 .cleanup = virtio_net_cleanup, 1234 .link_status_changed = virtio_net_set_link_status, 1235 }; 1236 1237 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1238 { 1239 VirtIONet *n = to_virtio_net(vdev); 1240 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1241 assert(n->vhost_started); 1242 return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx); 1243 } 1244 1245 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1246 bool mask) 1247 { 1248 VirtIONet *n = to_virtio_net(vdev); 1249 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1250 assert(n->vhost_started); 1251 vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), 1252 vdev, idx, mask); 1253 } 1254 1255 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, 1256 virtio_net_conf *net, uint32_t host_features) 1257 { 1258 VirtIONet *n; 1259 int i, config_size = 0; 1260 1261 for (i = 0; feature_sizes[i].flags != 0; i++) { 1262 if (host_features & feature_sizes[i].flags) { 1263 config_size = MAX(feature_sizes[i].end, config_size); 1264 } 1265 } 1266 1267 n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET, 1268 config_size, sizeof(VirtIONet)); 1269 1270 n->config_size = config_size; 1271 n->vdev.get_config = virtio_net_get_config; 1272 n->vdev.set_config = virtio_net_set_config; 1273 n->vdev.get_features = virtio_net_get_features; 1274 n->vdev.set_features = virtio_net_set_features; 1275 n->vdev.bad_features = virtio_net_bad_features; 1276 n->vdev.reset = virtio_net_reset; 1277 n->vdev.set_status = virtio_net_set_status; 1278 n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; 1279 n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; 1280 n->max_queues = MAX(conf->queues, 1); 1281 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1282 n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); 1283 n->curr_queues = 1; 1284 n->vqs[0].n = n; 1285 n->tx_timeout = net->txtimer; 1286 1287 if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { 1288 error_report("virtio-net: " 1289 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1290 net->tx); 1291 error_report("Defaulting to \"bh\""); 1292 } 1293 1294 if (net->tx && !strcmp(net->tx, "timer")) { 1295 n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, 1296 virtio_net_handle_tx_timer); 1297 n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, 1298 &n->vqs[0]); 1299 } else { 1300 n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, 1301 virtio_net_handle_tx_bh); 1302 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1303 } 1304 n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl); 1305 qemu_macaddr_default_if_unset(&conf->macaddr); 1306 memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); 1307 n->status = VIRTIO_NET_S_LINK_UP; 1308 1309 n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); 1310 peer_test_vnet_hdr(n); 1311 if (peer_has_vnet_hdr(n)) { 1312 for (i = 0; i < n->max_queues; i++) { 1313 tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1314 } 1315 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1316 } else { 1317 n->host_hdr_len = 0; 1318 } 1319 1320 qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a); 1321 1322 n->vqs[0].tx_waiting = 0; 1323 n->tx_burst = net->txburst; 1324 virtio_net_set_mrg_rx_bufs(n, 0); 1325 n->promisc = 1; /* for compatibility */ 1326 1327 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1328 1329 n->vlans = g_malloc0(MAX_VLAN >> 3); 1330 1331 n->qdev = dev; 1332 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1333 virtio_net_save, virtio_net_load, n); 1334 1335 add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0"); 1336 1337 return &n->vdev; 1338 } 1339 1340 void virtio_net_exit(VirtIODevice *vdev) 1341 { 1342 VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); 1343 int i; 1344 1345 /* This will stop vhost backend if appropriate. */ 1346 virtio_net_set_status(vdev, 0); 1347 1348 unregister_savevm(n->qdev, "virtio-net", n); 1349 1350 g_free(n->mac_table.macs); 1351 g_free(n->vlans); 1352 1353 for (i = 0; i < n->max_queues; i++) { 1354 VirtIONetQueue *q = &n->vqs[i]; 1355 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1356 1357 qemu_purge_queued_packets(nc); 1358 1359 if (q->tx_timer) { 1360 qemu_del_timer(q->tx_timer); 1361 qemu_free_timer(q->tx_timer); 1362 } else { 1363 qemu_bh_delete(q->tx_bh); 1364 } 1365 } 1366 1367 g_free(n->vqs); 1368 qemu_del_nic(n->nic); 1369 virtio_cleanup(&n->vdev); 1370 } 1371