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 25 #define VIRTIO_NET_VM_VERSION 11 26 27 #define MAC_TABLE_ENTRIES 64 28 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ 29 30 /* 31 * Calculate the number of bytes up to and including the given 'field' of 32 * 'container'. 33 */ 34 #define endof(container, field) \ 35 (offsetof(container, field) + sizeof(((container *)0)->field)) 36 37 typedef struct VirtIOFeature { 38 uint32_t flags; 39 size_t end; 40 } VirtIOFeature; 41 42 static VirtIOFeature feature_sizes[] = { 43 {.flags = 1 << VIRTIO_NET_F_MAC, 44 .end = endof(struct virtio_net_config, mac)}, 45 {.flags = 1 << VIRTIO_NET_F_STATUS, 46 .end = endof(struct virtio_net_config, status)}, 47 {.flags = 1 << VIRTIO_NET_F_MQ, 48 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 49 {} 50 }; 51 52 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 53 { 54 VirtIONet *n = qemu_get_nic_opaque(nc); 55 56 return &n->vqs[nc->queue_index]; 57 } 58 59 static int vq2q(int queue_index) 60 { 61 return queue_index / 2; 62 } 63 64 /* TODO 65 * - we could suppress RX interrupt if we were so inclined. 66 */ 67 68 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 69 { 70 VirtIONet *n = VIRTIO_NET(vdev); 71 struct virtio_net_config netcfg; 72 73 stw_p(&netcfg.status, n->status); 74 stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); 75 memcpy(netcfg.mac, n->mac, ETH_ALEN); 76 memcpy(config, &netcfg, n->config_size); 77 } 78 79 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 80 { 81 VirtIONet *n = VIRTIO_NET(vdev); 82 struct virtio_net_config netcfg = {}; 83 84 memcpy(&netcfg, config, n->config_size); 85 86 if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && 87 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 88 memcpy(n->mac, netcfg.mac, ETH_ALEN); 89 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 90 } 91 } 92 93 static bool virtio_net_started(VirtIONet *n, uint8_t status) 94 { 95 VirtIODevice *vdev = VIRTIO_DEVICE(n); 96 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 97 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 98 } 99 100 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 101 { 102 VirtIODevice *vdev = VIRTIO_DEVICE(n); 103 NetClientState *nc = qemu_get_queue(n->nic); 104 int queues = n->multiqueue ? n->max_queues : 1; 105 106 if (!nc->peer) { 107 return; 108 } 109 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 110 return; 111 } 112 113 if (!tap_get_vhost_net(nc->peer)) { 114 return; 115 } 116 117 if (!!n->vhost_started == virtio_net_started(n, status) && 118 !nc->peer->link_down) { 119 return; 120 } 121 if (!n->vhost_started) { 122 int r; 123 if (!vhost_net_query(tap_get_vhost_net(nc->peer), vdev)) { 124 return; 125 } 126 n->vhost_started = 1; 127 r = vhost_net_start(vdev, n->nic->ncs, queues); 128 if (r < 0) { 129 error_report("unable to start vhost net: %d: " 130 "falling back on userspace virtio", -r); 131 n->vhost_started = 0; 132 } 133 } else { 134 vhost_net_stop(vdev, n->nic->ncs, queues); 135 n->vhost_started = 0; 136 } 137 } 138 139 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 140 { 141 VirtIONet *n = VIRTIO_NET(vdev); 142 VirtIONetQueue *q; 143 int i; 144 uint8_t queue_status; 145 146 virtio_net_vhost_status(n, status); 147 148 for (i = 0; i < n->max_queues; i++) { 149 q = &n->vqs[i]; 150 151 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { 152 queue_status = 0; 153 } else { 154 queue_status = status; 155 } 156 157 if (!q->tx_waiting) { 158 continue; 159 } 160 161 if (virtio_net_started(n, queue_status) && !n->vhost_started) { 162 if (q->tx_timer) { 163 qemu_mod_timer(q->tx_timer, 164 qemu_get_clock_ns(vm_clock) + n->tx_timeout); 165 } else { 166 qemu_bh_schedule(q->tx_bh); 167 } 168 } else { 169 if (q->tx_timer) { 170 qemu_del_timer(q->tx_timer); 171 } else { 172 qemu_bh_cancel(q->tx_bh); 173 } 174 } 175 } 176 } 177 178 static void virtio_net_set_link_status(NetClientState *nc) 179 { 180 VirtIONet *n = qemu_get_nic_opaque(nc); 181 VirtIODevice *vdev = VIRTIO_DEVICE(n); 182 uint16_t old_status = n->status; 183 184 if (nc->link_down) 185 n->status &= ~VIRTIO_NET_S_LINK_UP; 186 else 187 n->status |= VIRTIO_NET_S_LINK_UP; 188 189 if (n->status != old_status) 190 virtio_notify_config(vdev); 191 192 virtio_net_set_status(vdev, vdev->status); 193 } 194 195 static void virtio_net_reset(VirtIODevice *vdev) 196 { 197 VirtIONet *n = VIRTIO_NET(vdev); 198 199 /* Reset back to compatibility mode */ 200 n->promisc = 1; 201 n->allmulti = 0; 202 n->alluni = 0; 203 n->nomulti = 0; 204 n->nouni = 0; 205 n->nobcast = 0; 206 /* multiqueue is disabled by default */ 207 n->curr_queues = 1; 208 209 /* Flush any MAC and VLAN filter table state */ 210 n->mac_table.in_use = 0; 211 n->mac_table.first_multi = 0; 212 n->mac_table.multi_overflow = 0; 213 n->mac_table.uni_overflow = 0; 214 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 215 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 216 memset(n->vlans, 0, MAX_VLAN >> 3); 217 } 218 219 static void peer_test_vnet_hdr(VirtIONet *n) 220 { 221 NetClientState *nc = qemu_get_queue(n->nic); 222 if (!nc->peer) { 223 return; 224 } 225 226 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 227 return; 228 } 229 230 n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer); 231 } 232 233 static int peer_has_vnet_hdr(VirtIONet *n) 234 { 235 return n->has_vnet_hdr; 236 } 237 238 static int peer_has_ufo(VirtIONet *n) 239 { 240 if (!peer_has_vnet_hdr(n)) 241 return 0; 242 243 n->has_ufo = tap_has_ufo(qemu_get_queue(n->nic)->peer); 244 245 return n->has_ufo; 246 } 247 248 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) 249 { 250 int i; 251 NetClientState *nc; 252 253 n->mergeable_rx_bufs = mergeable_rx_bufs; 254 255 n->guest_hdr_len = n->mergeable_rx_bufs ? 256 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); 257 258 for (i = 0; i < n->max_queues; i++) { 259 nc = qemu_get_subqueue(n->nic, i); 260 261 if (peer_has_vnet_hdr(n) && 262 tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 263 tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 264 n->host_hdr_len = n->guest_hdr_len; 265 } 266 } 267 } 268 269 static int peer_attach(VirtIONet *n, int index) 270 { 271 NetClientState *nc = qemu_get_subqueue(n->nic, index); 272 273 if (!nc->peer) { 274 return 0; 275 } 276 277 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 278 return 0; 279 } 280 281 return tap_enable(nc->peer); 282 } 283 284 static int peer_detach(VirtIONet *n, int index) 285 { 286 NetClientState *nc = qemu_get_subqueue(n->nic, index); 287 288 if (!nc->peer) { 289 return 0; 290 } 291 292 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 293 return 0; 294 } 295 296 return tap_disable(nc->peer); 297 } 298 299 static void virtio_net_set_queues(VirtIONet *n) 300 { 301 int i; 302 303 for (i = 0; i < n->max_queues; i++) { 304 if (i < n->curr_queues) { 305 assert(!peer_attach(n, i)); 306 } else { 307 assert(!peer_detach(n, i)); 308 } 309 } 310 } 311 312 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 313 314 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) 315 { 316 VirtIONet *n = VIRTIO_NET(vdev); 317 NetClientState *nc = qemu_get_queue(n->nic); 318 319 features |= (1 << VIRTIO_NET_F_MAC); 320 321 if (!peer_has_vnet_hdr(n)) { 322 features &= ~(0x1 << VIRTIO_NET_F_CSUM); 323 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); 324 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); 325 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); 326 327 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); 328 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); 329 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); 330 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); 331 } 332 333 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 334 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); 335 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); 336 } 337 338 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 339 return features; 340 } 341 if (!tap_get_vhost_net(nc->peer)) { 342 return features; 343 } 344 return vhost_net_get_features(tap_get_vhost_net(nc->peer), features); 345 } 346 347 static uint32_t virtio_net_bad_features(VirtIODevice *vdev) 348 { 349 uint32_t features = 0; 350 351 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 352 * but also these: */ 353 features |= (1 << VIRTIO_NET_F_MAC); 354 features |= (1 << VIRTIO_NET_F_CSUM); 355 features |= (1 << VIRTIO_NET_F_HOST_TSO4); 356 features |= (1 << VIRTIO_NET_F_HOST_TSO6); 357 features |= (1 << VIRTIO_NET_F_HOST_ECN); 358 359 return features; 360 } 361 362 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) 363 { 364 VirtIONet *n = VIRTIO_NET(vdev); 365 int i; 366 367 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); 368 369 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 370 371 if (n->has_vnet_hdr) { 372 tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer, 373 (features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 374 (features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 375 (features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 376 (features >> VIRTIO_NET_F_GUEST_ECN) & 1, 377 (features >> VIRTIO_NET_F_GUEST_UFO) & 1); 378 } 379 380 for (i = 0; i < n->max_queues; i++) { 381 NetClientState *nc = qemu_get_subqueue(n->nic, i); 382 383 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 384 continue; 385 } 386 if (!tap_get_vhost_net(nc->peer)) { 387 continue; 388 } 389 vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); 390 } 391 } 392 393 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 394 struct iovec *iov, unsigned int iov_cnt) 395 { 396 uint8_t on; 397 size_t s; 398 399 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 400 if (s != sizeof(on)) { 401 return VIRTIO_NET_ERR; 402 } 403 404 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 405 n->promisc = on; 406 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 407 n->allmulti = on; 408 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 409 n->alluni = on; 410 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 411 n->nomulti = on; 412 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 413 n->nouni = on; 414 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 415 n->nobcast = on; 416 } else { 417 return VIRTIO_NET_ERR; 418 } 419 420 return VIRTIO_NET_OK; 421 } 422 423 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 424 struct iovec *iov, unsigned int iov_cnt) 425 { 426 struct virtio_net_ctrl_mac mac_data; 427 size_t s; 428 429 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 430 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 431 return VIRTIO_NET_ERR; 432 } 433 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 434 assert(s == sizeof(n->mac)); 435 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 436 return VIRTIO_NET_OK; 437 } 438 439 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 440 return VIRTIO_NET_ERR; 441 } 442 443 n->mac_table.in_use = 0; 444 n->mac_table.first_multi = 0; 445 n->mac_table.uni_overflow = 0; 446 n->mac_table.multi_overflow = 0; 447 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 448 449 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 450 sizeof(mac_data.entries)); 451 mac_data.entries = ldl_p(&mac_data.entries); 452 if (s != sizeof(mac_data.entries)) { 453 return VIRTIO_NET_ERR; 454 } 455 iov_discard_front(&iov, &iov_cnt, s); 456 457 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 458 return VIRTIO_NET_ERR; 459 } 460 461 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 462 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 463 mac_data.entries * ETH_ALEN); 464 if (s != mac_data.entries * ETH_ALEN) { 465 return VIRTIO_NET_ERR; 466 } 467 n->mac_table.in_use += mac_data.entries; 468 } else { 469 n->mac_table.uni_overflow = 1; 470 } 471 472 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 473 474 n->mac_table.first_multi = n->mac_table.in_use; 475 476 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 477 sizeof(mac_data.entries)); 478 mac_data.entries = ldl_p(&mac_data.entries); 479 if (s != sizeof(mac_data.entries)) { 480 return VIRTIO_NET_ERR; 481 } 482 483 iov_discard_front(&iov, &iov_cnt, s); 484 485 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 486 return VIRTIO_NET_ERR; 487 } 488 489 if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) { 490 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 491 mac_data.entries * ETH_ALEN); 492 if (s != mac_data.entries * ETH_ALEN) { 493 return VIRTIO_NET_ERR; 494 } 495 n->mac_table.in_use += mac_data.entries; 496 } else { 497 n->mac_table.multi_overflow = 1; 498 } 499 500 return VIRTIO_NET_OK; 501 } 502 503 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 504 struct iovec *iov, unsigned int iov_cnt) 505 { 506 uint16_t vid; 507 size_t s; 508 509 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 510 vid = lduw_p(&vid); 511 if (s != sizeof(vid)) { 512 return VIRTIO_NET_ERR; 513 } 514 515 if (vid >= MAX_VLAN) 516 return VIRTIO_NET_ERR; 517 518 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 519 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 520 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 521 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 522 else 523 return VIRTIO_NET_ERR; 524 525 return VIRTIO_NET_OK; 526 } 527 528 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 529 struct iovec *iov, unsigned int iov_cnt) 530 { 531 VirtIODevice *vdev = VIRTIO_DEVICE(n); 532 struct virtio_net_ctrl_mq mq; 533 size_t s; 534 uint16_t queues; 535 536 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 537 if (s != sizeof(mq)) { 538 return VIRTIO_NET_ERR; 539 } 540 541 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 542 return VIRTIO_NET_ERR; 543 } 544 545 queues = lduw_p(&mq.virtqueue_pairs); 546 547 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 548 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 549 queues > n->max_queues || 550 !n->multiqueue) { 551 return VIRTIO_NET_ERR; 552 } 553 554 n->curr_queues = queues; 555 /* stop the backend before changing the number of queues to avoid handling a 556 * disabled queue */ 557 virtio_net_set_status(vdev, vdev->status); 558 virtio_net_set_queues(n); 559 560 return VIRTIO_NET_OK; 561 } 562 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 563 { 564 VirtIONet *n = VIRTIO_NET(vdev); 565 struct virtio_net_ctrl_hdr ctrl; 566 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 567 VirtQueueElement elem; 568 size_t s; 569 struct iovec *iov; 570 unsigned int iov_cnt; 571 572 while (virtqueue_pop(vq, &elem)) { 573 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || 574 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { 575 error_report("virtio-net ctrl missing headers"); 576 exit(1); 577 } 578 579 iov = elem.out_sg; 580 iov_cnt = elem.out_num; 581 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); 582 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); 583 if (s != sizeof(ctrl)) { 584 status = VIRTIO_NET_ERR; 585 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 586 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); 587 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 588 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); 589 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 590 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); 591 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 592 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); 593 } 594 595 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); 596 assert(s == sizeof(status)); 597 598 virtqueue_push(vq, &elem, sizeof(status)); 599 virtio_notify(vdev, vq); 600 } 601 } 602 603 /* RX */ 604 605 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 606 { 607 VirtIONet *n = VIRTIO_NET(vdev); 608 int queue_index = vq2q(virtio_get_queue_index(vq)); 609 610 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 611 } 612 613 static int virtio_net_can_receive(NetClientState *nc) 614 { 615 VirtIONet *n = qemu_get_nic_opaque(nc); 616 VirtIODevice *vdev = VIRTIO_DEVICE(n); 617 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 618 619 if (!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 !(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 VirtIODevice *vdev = VIRTIO_DEVICE(n); 759 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 760 struct virtio_net_hdr_mrg_rxbuf mhdr; 761 unsigned mhdr_cnt = 0; 762 size_t offset, i, guest_offset; 763 764 if (!virtio_net_can_receive(nc)) { 765 return -1; 766 } 767 768 /* hdr_len refers to the header we supply to the guest */ 769 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 770 return 0; 771 } 772 773 if (!receive_filter(n, buf, size)) 774 return size; 775 776 offset = i = 0; 777 778 while (offset < size) { 779 VirtQueueElement elem; 780 int len, total; 781 const struct iovec *sg = elem.in_sg; 782 783 total = 0; 784 785 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 786 if (i == 0) 787 return -1; 788 error_report("virtio-net unexpected empty queue: " 789 "i %zd mergeable %d offset %zd, size %zd, " 790 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 791 i, n->mergeable_rx_bufs, offset, size, 792 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 793 exit(1); 794 } 795 796 if (elem.in_num < 1) { 797 error_report("virtio-net receive queue contains no in buffers"); 798 exit(1); 799 } 800 801 if (i == 0) { 802 assert(offset == 0); 803 if (n->mergeable_rx_bufs) { 804 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 805 sg, elem.in_num, 806 offsetof(typeof(mhdr), num_buffers), 807 sizeof(mhdr.num_buffers)); 808 } 809 810 receive_header(n, sg, elem.in_num, buf, size); 811 offset = n->host_hdr_len; 812 total += n->guest_hdr_len; 813 guest_offset = n->guest_hdr_len; 814 } else { 815 guest_offset = 0; 816 } 817 818 /* copy in packet. ugh */ 819 len = iov_from_buf(sg, elem.in_num, guest_offset, 820 buf + offset, size - offset); 821 total += len; 822 offset += len; 823 /* If buffers can't be merged, at this point we 824 * must have consumed the complete packet. 825 * Otherwise, drop it. */ 826 if (!n->mergeable_rx_bufs && offset < size) { 827 #if 0 828 error_report("virtio-net truncated non-mergeable packet: " 829 "i %zd mergeable %d offset %zd, size %zd, " 830 "guest hdr len %zd, host hdr len %zd", 831 i, n->mergeable_rx_bufs, 832 offset, size, n->guest_hdr_len, n->host_hdr_len); 833 #endif 834 return size; 835 } 836 837 /* signal other side */ 838 virtqueue_fill(q->rx_vq, &elem, total, i++); 839 } 840 841 if (mhdr_cnt) { 842 stw_p(&mhdr.num_buffers, i); 843 iov_from_buf(mhdr_sg, mhdr_cnt, 844 0, 845 &mhdr.num_buffers, sizeof mhdr.num_buffers); 846 } 847 848 virtqueue_flush(q->rx_vq, i); 849 virtio_notify(vdev, q->rx_vq); 850 851 return size; 852 } 853 854 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 855 856 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 857 { 858 VirtIONet *n = qemu_get_nic_opaque(nc); 859 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 860 VirtIODevice *vdev = VIRTIO_DEVICE(n); 861 862 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 863 virtio_notify(vdev, q->tx_vq); 864 865 q->async_tx.elem.out_num = q->async_tx.len = 0; 866 867 virtio_queue_set_notification(q->tx_vq, 1); 868 virtio_net_flush_tx(q); 869 } 870 871 /* TX */ 872 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 873 { 874 VirtIONet *n = q->n; 875 VirtIODevice *vdev = VIRTIO_DEVICE(n); 876 VirtQueueElement elem; 877 int32_t num_packets = 0; 878 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 879 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 880 return num_packets; 881 } 882 883 assert(vdev->vm_running); 884 885 if (q->async_tx.elem.out_num) { 886 virtio_queue_set_notification(q->tx_vq, 0); 887 return num_packets; 888 } 889 890 while (virtqueue_pop(q->tx_vq, &elem)) { 891 ssize_t ret, len; 892 unsigned int out_num = elem.out_num; 893 struct iovec *out_sg = &elem.out_sg[0]; 894 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 895 896 if (out_num < 1) { 897 error_report("virtio-net header not in first element"); 898 exit(1); 899 } 900 901 /* 902 * If host wants to see the guest header as is, we can 903 * pass it on unchanged. Otherwise, copy just the parts 904 * that host is interested in. 905 */ 906 assert(n->host_hdr_len <= n->guest_hdr_len); 907 if (n->host_hdr_len != n->guest_hdr_len) { 908 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 909 out_sg, out_num, 910 0, n->host_hdr_len); 911 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 912 out_sg, out_num, 913 n->guest_hdr_len, -1); 914 out_num = sg_num; 915 out_sg = sg; 916 } 917 918 len = n->guest_hdr_len; 919 920 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 921 out_sg, out_num, virtio_net_tx_complete); 922 if (ret == 0) { 923 virtio_queue_set_notification(q->tx_vq, 0); 924 q->async_tx.elem = elem; 925 q->async_tx.len = len; 926 return -EBUSY; 927 } 928 929 len += ret; 930 931 virtqueue_push(q->tx_vq, &elem, 0); 932 virtio_notify(vdev, q->tx_vq); 933 934 if (++num_packets >= n->tx_burst) { 935 break; 936 } 937 } 938 return num_packets; 939 } 940 941 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 942 { 943 VirtIONet *n = VIRTIO_NET(vdev); 944 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 945 946 /* This happens when device was stopped but VCPU wasn't. */ 947 if (!vdev->vm_running) { 948 q->tx_waiting = 1; 949 return; 950 } 951 952 if (q->tx_waiting) { 953 virtio_queue_set_notification(vq, 1); 954 qemu_del_timer(q->tx_timer); 955 q->tx_waiting = 0; 956 virtio_net_flush_tx(q); 957 } else { 958 qemu_mod_timer(q->tx_timer, 959 qemu_get_clock_ns(vm_clock) + n->tx_timeout); 960 q->tx_waiting = 1; 961 virtio_queue_set_notification(vq, 0); 962 } 963 } 964 965 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 966 { 967 VirtIONet *n = VIRTIO_NET(vdev); 968 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 969 970 if (unlikely(q->tx_waiting)) { 971 return; 972 } 973 q->tx_waiting = 1; 974 /* This happens when device was stopped but VCPU wasn't. */ 975 if (!vdev->vm_running) { 976 return; 977 } 978 virtio_queue_set_notification(vq, 0); 979 qemu_bh_schedule(q->tx_bh); 980 } 981 982 static void virtio_net_tx_timer(void *opaque) 983 { 984 VirtIONetQueue *q = opaque; 985 VirtIONet *n = q->n; 986 VirtIODevice *vdev = VIRTIO_DEVICE(n); 987 assert(vdev->vm_running); 988 989 q->tx_waiting = 0; 990 991 /* Just in case the driver is not ready on more */ 992 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 993 return; 994 } 995 996 virtio_queue_set_notification(q->tx_vq, 1); 997 virtio_net_flush_tx(q); 998 } 999 1000 static void virtio_net_tx_bh(void *opaque) 1001 { 1002 VirtIONetQueue *q = opaque; 1003 VirtIONet *n = q->n; 1004 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1005 int32_t ret; 1006 1007 assert(vdev->vm_running); 1008 1009 q->tx_waiting = 0; 1010 1011 /* Just in case the driver is not ready on more */ 1012 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1013 return; 1014 } 1015 1016 ret = virtio_net_flush_tx(q); 1017 if (ret == -EBUSY) { 1018 return; /* Notification re-enable handled by tx_complete */ 1019 } 1020 1021 /* If we flush a full burst of packets, assume there are 1022 * more coming and immediately reschedule */ 1023 if (ret >= n->tx_burst) { 1024 qemu_bh_schedule(q->tx_bh); 1025 q->tx_waiting = 1; 1026 return; 1027 } 1028 1029 /* If less than a full burst, re-enable notification and flush 1030 * anything that may have come in while we weren't looking. If 1031 * we find something, assume the guest is still active and reschedule */ 1032 virtio_queue_set_notification(q->tx_vq, 1); 1033 if (virtio_net_flush_tx(q) > 0) { 1034 virtio_queue_set_notification(q->tx_vq, 0); 1035 qemu_bh_schedule(q->tx_bh); 1036 q->tx_waiting = 1; 1037 } 1038 } 1039 1040 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 1041 { 1042 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1043 int i, max = multiqueue ? n->max_queues : 1; 1044 1045 n->multiqueue = multiqueue; 1046 1047 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1048 virtio_del_queue(vdev, i); 1049 } 1050 1051 for (i = 1; i < max; i++) { 1052 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1053 if (n->vqs[i].tx_timer) { 1054 n->vqs[i].tx_vq = 1055 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1056 n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, 1057 virtio_net_tx_timer, 1058 &n->vqs[i]); 1059 } else { 1060 n->vqs[i].tx_vq = 1061 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1062 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1063 } 1064 1065 n->vqs[i].tx_waiting = 0; 1066 n->vqs[i].n = n; 1067 } 1068 1069 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack 1070 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid 1071 * breaking them. 1072 */ 1073 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1074 1075 virtio_net_set_queues(n); 1076 } 1077 1078 static void virtio_net_save(QEMUFile *f, void *opaque) 1079 { 1080 int i; 1081 VirtIONet *n = opaque; 1082 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1083 1084 /* At this point, backend must be stopped, otherwise 1085 * it might keep writing to memory. */ 1086 assert(!n->vhost_started); 1087 virtio_save(vdev, f); 1088 1089 qemu_put_buffer(f, n->mac, ETH_ALEN); 1090 qemu_put_be32(f, n->vqs[0].tx_waiting); 1091 qemu_put_be32(f, n->mergeable_rx_bufs); 1092 qemu_put_be16(f, n->status); 1093 qemu_put_byte(f, n->promisc); 1094 qemu_put_byte(f, n->allmulti); 1095 qemu_put_be32(f, n->mac_table.in_use); 1096 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1097 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1098 qemu_put_be32(f, n->has_vnet_hdr); 1099 qemu_put_byte(f, n->mac_table.multi_overflow); 1100 qemu_put_byte(f, n->mac_table.uni_overflow); 1101 qemu_put_byte(f, n->alluni); 1102 qemu_put_byte(f, n->nomulti); 1103 qemu_put_byte(f, n->nouni); 1104 qemu_put_byte(f, n->nobcast); 1105 qemu_put_byte(f, n->has_ufo); 1106 if (n->max_queues > 1) { 1107 qemu_put_be16(f, n->max_queues); 1108 qemu_put_be16(f, n->curr_queues); 1109 for (i = 1; i < n->curr_queues; i++) { 1110 qemu_put_be32(f, n->vqs[i].tx_waiting); 1111 } 1112 } 1113 } 1114 1115 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1116 { 1117 VirtIONet *n = opaque; 1118 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1119 int ret, i, link_down; 1120 1121 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1122 return -EINVAL; 1123 1124 ret = virtio_load(vdev, f); 1125 if (ret) { 1126 return ret; 1127 } 1128 1129 qemu_get_buffer(f, n->mac, ETH_ALEN); 1130 n->vqs[0].tx_waiting = qemu_get_be32(f); 1131 1132 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1133 1134 if (version_id >= 3) 1135 n->status = qemu_get_be16(f); 1136 1137 if (version_id >= 4) { 1138 if (version_id < 8) { 1139 n->promisc = qemu_get_be32(f); 1140 n->allmulti = qemu_get_be32(f); 1141 } else { 1142 n->promisc = qemu_get_byte(f); 1143 n->allmulti = qemu_get_byte(f); 1144 } 1145 } 1146 1147 if (version_id >= 5) { 1148 n->mac_table.in_use = qemu_get_be32(f); 1149 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1150 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1151 qemu_get_buffer(f, n->mac_table.macs, 1152 n->mac_table.in_use * ETH_ALEN); 1153 } else if (n->mac_table.in_use) { 1154 uint8_t *buf = g_malloc0(n->mac_table.in_use); 1155 qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); 1156 g_free(buf); 1157 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1158 n->mac_table.in_use = 0; 1159 } 1160 } 1161 1162 if (version_id >= 6) 1163 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1164 1165 if (version_id >= 7) { 1166 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1167 error_report("virtio-net: saved image requires vnet_hdr=on"); 1168 return -1; 1169 } 1170 1171 if (n->has_vnet_hdr) { 1172 tap_set_offload(qemu_get_queue(n->nic)->peer, 1173 (vdev->guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 1174 (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 1175 (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 1176 (vdev->guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1, 1177 (vdev->guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1); 1178 } 1179 } 1180 1181 if (version_id >= 9) { 1182 n->mac_table.multi_overflow = qemu_get_byte(f); 1183 n->mac_table.uni_overflow = qemu_get_byte(f); 1184 } 1185 1186 if (version_id >= 10) { 1187 n->alluni = qemu_get_byte(f); 1188 n->nomulti = qemu_get_byte(f); 1189 n->nouni = qemu_get_byte(f); 1190 n->nobcast = qemu_get_byte(f); 1191 } 1192 1193 if (version_id >= 11) { 1194 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1195 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1196 return -1; 1197 } 1198 } 1199 1200 if (n->max_queues > 1) { 1201 if (n->max_queues != qemu_get_be16(f)) { 1202 error_report("virtio-net: different max_queues "); 1203 return -1; 1204 } 1205 1206 n->curr_queues = qemu_get_be16(f); 1207 for (i = 1; i < n->curr_queues; i++) { 1208 n->vqs[i].tx_waiting = qemu_get_be32(f); 1209 } 1210 } 1211 1212 virtio_net_set_queues(n); 1213 1214 /* Find the first multicast entry in the saved MAC filter */ 1215 for (i = 0; i < n->mac_table.in_use; i++) { 1216 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1217 break; 1218 } 1219 } 1220 n->mac_table.first_multi = i; 1221 1222 /* nc.link_down can't be migrated, so infer link_down according 1223 * to link status bit in n->status */ 1224 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1225 for (i = 0; i < n->max_queues; i++) { 1226 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1227 } 1228 1229 return 0; 1230 } 1231 1232 static void virtio_net_cleanup(NetClientState *nc) 1233 { 1234 VirtIONet *n = qemu_get_nic_opaque(nc); 1235 1236 n->nic = NULL; 1237 } 1238 1239 static NetClientInfo net_virtio_info = { 1240 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1241 .size = sizeof(NICState), 1242 .can_receive = virtio_net_can_receive, 1243 .receive = virtio_net_receive, 1244 .cleanup = virtio_net_cleanup, 1245 .link_status_changed = virtio_net_set_link_status, 1246 }; 1247 1248 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1249 { 1250 VirtIONet *n = VIRTIO_NET(vdev); 1251 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1252 assert(n->vhost_started); 1253 return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx); 1254 } 1255 1256 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1257 bool mask) 1258 { 1259 VirtIONet *n = VIRTIO_NET(vdev); 1260 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1261 assert(n->vhost_started); 1262 vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), 1263 vdev, idx, mask); 1264 } 1265 1266 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1267 { 1268 int i, config_size = 0; 1269 host_features |= (1 << VIRTIO_NET_F_MAC); 1270 for (i = 0; feature_sizes[i].flags != 0; i++) { 1271 if (host_features & feature_sizes[i].flags) { 1272 config_size = MAX(feature_sizes[i].end, config_size); 1273 } 1274 } 1275 n->config_size = config_size; 1276 } 1277 1278 static int virtio_net_device_init(VirtIODevice *vdev) 1279 { 1280 int i; 1281 1282 DeviceState *qdev = DEVICE(vdev); 1283 VirtIONet *n = VIRTIO_NET(vdev); 1284 1285 virtio_init(VIRTIO_DEVICE(n), "virtio-net", VIRTIO_ID_NET, 1286 n->config_size); 1287 1288 n->max_queues = MAX(n->nic_conf.queues, 1); 1289 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1290 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1291 n->curr_queues = 1; 1292 n->vqs[0].n = n; 1293 n->tx_timeout = n->net_conf.txtimer; 1294 1295 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1296 && strcmp(n->net_conf.tx, "bh")) { 1297 error_report("virtio-net: " 1298 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1299 n->net_conf.tx); 1300 error_report("Defaulting to \"bh\""); 1301 } 1302 1303 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1304 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1305 virtio_net_handle_tx_timer); 1306 n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, 1307 &n->vqs[0]); 1308 } else { 1309 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1310 virtio_net_handle_tx_bh); 1311 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1312 } 1313 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1314 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1315 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1316 n->status = VIRTIO_NET_S_LINK_UP; 1317 1318 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1319 object_get_typename(OBJECT(qdev)), qdev->id, n); 1320 peer_test_vnet_hdr(n); 1321 if (peer_has_vnet_hdr(n)) { 1322 for (i = 0; i < n->max_queues; i++) { 1323 tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1324 } 1325 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1326 } else { 1327 n->host_hdr_len = 0; 1328 } 1329 1330 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1331 1332 n->vqs[0].tx_waiting = 0; 1333 n->tx_burst = n->net_conf.txburst; 1334 virtio_net_set_mrg_rx_bufs(n, 0); 1335 n->promisc = 1; /* for compatibility */ 1336 1337 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1338 1339 n->vlans = g_malloc0(MAX_VLAN >> 3); 1340 1341 n->qdev = qdev; 1342 register_savevm(qdev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1343 virtio_net_save, virtio_net_load, n); 1344 1345 add_boot_device_path(n->nic_conf.bootindex, qdev, "/ethernet-phy@0"); 1346 return 0; 1347 } 1348 1349 static int virtio_net_device_exit(DeviceState *qdev) 1350 { 1351 VirtIONet *n = VIRTIO_NET(qdev); 1352 VirtIODevice *vdev = VIRTIO_DEVICE(qdev); 1353 int i; 1354 1355 /* This will stop vhost backend if appropriate. */ 1356 virtio_net_set_status(vdev, 0); 1357 1358 unregister_savevm(qdev, "virtio-net", n); 1359 1360 g_free(n->mac_table.macs); 1361 g_free(n->vlans); 1362 1363 for (i = 0; i < n->max_queues; i++) { 1364 VirtIONetQueue *q = &n->vqs[i]; 1365 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1366 1367 qemu_purge_queued_packets(nc); 1368 1369 if (q->tx_timer) { 1370 qemu_del_timer(q->tx_timer); 1371 qemu_free_timer(q->tx_timer); 1372 } else { 1373 qemu_bh_delete(q->tx_bh); 1374 } 1375 } 1376 1377 g_free(n->vqs); 1378 qemu_del_nic(n->nic); 1379 virtio_cleanup(vdev); 1380 1381 return 0; 1382 } 1383 1384 static void virtio_net_instance_init(Object *obj) 1385 { 1386 VirtIONet *n = VIRTIO_NET(obj); 1387 1388 /* 1389 * The default config_size is sizeof(struct virtio_net_config). 1390 * Can be overriden with virtio_net_set_config_size. 1391 */ 1392 n->config_size = sizeof(struct virtio_net_config); 1393 } 1394 1395 static Property virtio_net_properties[] = { 1396 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1397 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1398 TX_TIMER_INTERVAL), 1399 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1400 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1401 DEFINE_PROP_END_OF_LIST(), 1402 }; 1403 1404 static void virtio_net_class_init(ObjectClass *klass, void *data) 1405 { 1406 DeviceClass *dc = DEVICE_CLASS(klass); 1407 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1408 dc->exit = virtio_net_device_exit; 1409 dc->props = virtio_net_properties; 1410 vdc->init = virtio_net_device_init; 1411 vdc->get_config = virtio_net_get_config; 1412 vdc->set_config = virtio_net_set_config; 1413 vdc->get_features = virtio_net_get_features; 1414 vdc->set_features = virtio_net_set_features; 1415 vdc->bad_features = virtio_net_bad_features; 1416 vdc->reset = virtio_net_reset; 1417 vdc->set_status = virtio_net_set_status; 1418 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1419 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1420 } 1421 1422 static const TypeInfo virtio_net_info = { 1423 .name = TYPE_VIRTIO_NET, 1424 .parent = TYPE_VIRTIO_DEVICE, 1425 .instance_size = sizeof(VirtIONet), 1426 .instance_init = virtio_net_instance_init, 1427 .class_init = virtio_net_class_init, 1428 }; 1429 1430 static void virtio_register_types(void) 1431 { 1432 type_register_static(&virtio_net_info); 1433 } 1434 1435 type_init(virtio_register_types) 1436