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, int ctrl); 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 !!(features & (1 << VIRTIO_NET_F_CTRL_VQ))); 369 370 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); 371 372 if (n->has_vnet_hdr) { 373 tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer, 374 (features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 375 (features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 376 (features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 377 (features >> VIRTIO_NET_F_GUEST_ECN) & 1, 378 (features >> VIRTIO_NET_F_GUEST_UFO) & 1); 379 } 380 381 for (i = 0; i < n->max_queues; i++) { 382 NetClientState *nc = qemu_get_subqueue(n->nic, i); 383 384 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { 385 continue; 386 } 387 if (!tap_get_vhost_net(nc->peer)) { 388 continue; 389 } 390 vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); 391 } 392 } 393 394 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 395 struct iovec *iov, unsigned int iov_cnt) 396 { 397 uint8_t on; 398 size_t s; 399 400 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 401 if (s != sizeof(on)) { 402 return VIRTIO_NET_ERR; 403 } 404 405 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 406 n->promisc = on; 407 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 408 n->allmulti = on; 409 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 410 n->alluni = on; 411 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 412 n->nomulti = on; 413 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 414 n->nouni = on; 415 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 416 n->nobcast = on; 417 } else { 418 return VIRTIO_NET_ERR; 419 } 420 421 return VIRTIO_NET_OK; 422 } 423 424 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 425 struct iovec *iov, unsigned int iov_cnt) 426 { 427 struct virtio_net_ctrl_mac mac_data; 428 size_t s; 429 430 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 431 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 432 return VIRTIO_NET_ERR; 433 } 434 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 435 assert(s == sizeof(n->mac)); 436 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 437 return VIRTIO_NET_OK; 438 } 439 440 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 441 return VIRTIO_NET_ERR; 442 } 443 444 n->mac_table.in_use = 0; 445 n->mac_table.first_multi = 0; 446 n->mac_table.uni_overflow = 0; 447 n->mac_table.multi_overflow = 0; 448 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 449 450 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 451 sizeof(mac_data.entries)); 452 mac_data.entries = ldl_p(&mac_data.entries); 453 if (s != sizeof(mac_data.entries)) { 454 return VIRTIO_NET_ERR; 455 } 456 iov_discard_front(&iov, &iov_cnt, s); 457 458 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 459 return VIRTIO_NET_ERR; 460 } 461 462 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 463 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 464 mac_data.entries * ETH_ALEN); 465 if (s != mac_data.entries * ETH_ALEN) { 466 return VIRTIO_NET_ERR; 467 } 468 n->mac_table.in_use += mac_data.entries; 469 } else { 470 n->mac_table.uni_overflow = 1; 471 } 472 473 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 474 475 n->mac_table.first_multi = n->mac_table.in_use; 476 477 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 478 sizeof(mac_data.entries)); 479 mac_data.entries = ldl_p(&mac_data.entries); 480 if (s != sizeof(mac_data.entries)) { 481 return VIRTIO_NET_ERR; 482 } 483 484 iov_discard_front(&iov, &iov_cnt, s); 485 486 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 487 return VIRTIO_NET_ERR; 488 } 489 490 if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) { 491 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, 492 mac_data.entries * ETH_ALEN); 493 if (s != mac_data.entries * ETH_ALEN) { 494 return VIRTIO_NET_ERR; 495 } 496 n->mac_table.in_use += mac_data.entries; 497 } else { 498 n->mac_table.multi_overflow = 1; 499 } 500 501 return VIRTIO_NET_OK; 502 } 503 504 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 505 struct iovec *iov, unsigned int iov_cnt) 506 { 507 uint16_t vid; 508 size_t s; 509 510 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 511 vid = lduw_p(&vid); 512 if (s != sizeof(vid)) { 513 return VIRTIO_NET_ERR; 514 } 515 516 if (vid >= MAX_VLAN) 517 return VIRTIO_NET_ERR; 518 519 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 520 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 521 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 522 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 523 else 524 return VIRTIO_NET_ERR; 525 526 return VIRTIO_NET_OK; 527 } 528 529 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 530 struct iovec *iov, unsigned int iov_cnt) 531 { 532 VirtIODevice *vdev = VIRTIO_DEVICE(n); 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(vdev, 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 = 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 = 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 VirtIODevice *vdev = VIRTIO_DEVICE(n); 618 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 619 620 if (!vdev->vm_running) { 621 return 0; 622 } 623 624 if (nc->queue_index >= n->curr_queues) { 625 return 0; 626 } 627 628 if (!virtio_queue_ready(q->rx_vq) || 629 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 630 return 0; 631 } 632 633 return 1; 634 } 635 636 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 637 { 638 VirtIONet *n = q->n; 639 if (virtio_queue_empty(q->rx_vq) || 640 (n->mergeable_rx_bufs && 641 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 642 virtio_queue_set_notification(q->rx_vq, 1); 643 644 /* To avoid a race condition where the guest has made some buffers 645 * available after the above check but before notification was 646 * enabled, check for available buffers again. 647 */ 648 if (virtio_queue_empty(q->rx_vq) || 649 (n->mergeable_rx_bufs && 650 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { 651 return 0; 652 } 653 } 654 655 virtio_queue_set_notification(q->rx_vq, 0); 656 return 1; 657 } 658 659 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 660 * it never finds out that the packets don't have valid checksums. This 661 * causes dhclient to get upset. Fedora's carried a patch for ages to 662 * fix this with Xen but it hasn't appeared in an upstream release of 663 * dhclient yet. 664 * 665 * To avoid breaking existing guests, we catch udp packets and add 666 * checksums. This is terrible but it's better than hacking the guest 667 * kernels. 668 * 669 * N.B. if we introduce a zero-copy API, this operation is no longer free so 670 * we should provide a mechanism to disable it to avoid polluting the host 671 * cache. 672 */ 673 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 674 uint8_t *buf, size_t size) 675 { 676 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 677 (size > 27 && size < 1500) && /* normal sized MTU */ 678 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 679 (buf[23] == 17) && /* ip.protocol == UDP */ 680 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 681 net_checksum_calculate(buf, size); 682 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 683 } 684 } 685 686 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 687 const void *buf, size_t size) 688 { 689 if (n->has_vnet_hdr) { 690 /* FIXME this cast is evil */ 691 void *wbuf = (void *)buf; 692 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 693 size - n->host_hdr_len); 694 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 695 } else { 696 struct virtio_net_hdr hdr = { 697 .flags = 0, 698 .gso_type = VIRTIO_NET_HDR_GSO_NONE 699 }; 700 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 701 } 702 } 703 704 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 705 { 706 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 707 static const uint8_t vlan[] = {0x81, 0x00}; 708 uint8_t *ptr = (uint8_t *)buf; 709 int i; 710 711 if (n->promisc) 712 return 1; 713 714 ptr += n->host_hdr_len; 715 716 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 717 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; 718 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 719 return 0; 720 } 721 722 if (ptr[0] & 1) { // multicast 723 if (!memcmp(ptr, bcast, sizeof(bcast))) { 724 return !n->nobcast; 725 } else if (n->nomulti) { 726 return 0; 727 } else if (n->allmulti || n->mac_table.multi_overflow) { 728 return 1; 729 } 730 731 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 732 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 733 return 1; 734 } 735 } 736 } else { // unicast 737 if (n->nouni) { 738 return 0; 739 } else if (n->alluni || n->mac_table.uni_overflow) { 740 return 1; 741 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 742 return 1; 743 } 744 745 for (i = 0; i < n->mac_table.first_multi; i++) { 746 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 747 return 1; 748 } 749 } 750 } 751 752 return 0; 753 } 754 755 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) 756 { 757 VirtIONet *n = qemu_get_nic_opaque(nc); 758 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 759 VirtIODevice *vdev = VIRTIO_DEVICE(n); 760 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 761 struct virtio_net_hdr_mrg_rxbuf mhdr; 762 unsigned mhdr_cnt = 0; 763 size_t offset, i, guest_offset; 764 765 if (!virtio_net_can_receive(nc)) { 766 return -1; 767 } 768 769 /* hdr_len refers to the header we supply to the guest */ 770 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 771 return 0; 772 } 773 774 if (!receive_filter(n, buf, size)) 775 return size; 776 777 offset = i = 0; 778 779 while (offset < size) { 780 VirtQueueElement elem; 781 int len, total; 782 const struct iovec *sg = elem.in_sg; 783 784 total = 0; 785 786 if (virtqueue_pop(q->rx_vq, &elem) == 0) { 787 if (i == 0) 788 return -1; 789 error_report("virtio-net unexpected empty queue: " 790 "i %zd mergeable %d offset %zd, size %zd, " 791 "guest hdr len %zd, host hdr len %zd guest features 0x%x", 792 i, n->mergeable_rx_bufs, offset, size, 793 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); 794 exit(1); 795 } 796 797 if (elem.in_num < 1) { 798 error_report("virtio-net receive queue contains no in buffers"); 799 exit(1); 800 } 801 802 if (i == 0) { 803 assert(offset == 0); 804 if (n->mergeable_rx_bufs) { 805 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 806 sg, elem.in_num, 807 offsetof(typeof(mhdr), num_buffers), 808 sizeof(mhdr.num_buffers)); 809 } 810 811 receive_header(n, sg, elem.in_num, buf, size); 812 offset = n->host_hdr_len; 813 total += n->guest_hdr_len; 814 guest_offset = n->guest_hdr_len; 815 } else { 816 guest_offset = 0; 817 } 818 819 /* copy in packet. ugh */ 820 len = iov_from_buf(sg, elem.in_num, guest_offset, 821 buf + offset, size - offset); 822 total += len; 823 offset += len; 824 /* If buffers can't be merged, at this point we 825 * must have consumed the complete packet. 826 * Otherwise, drop it. */ 827 if (!n->mergeable_rx_bufs && offset < size) { 828 #if 0 829 error_report("virtio-net truncated non-mergeable packet: " 830 "i %zd mergeable %d offset %zd, size %zd, " 831 "guest hdr len %zd, host hdr len %zd", 832 i, n->mergeable_rx_bufs, 833 offset, size, n->guest_hdr_len, n->host_hdr_len); 834 #endif 835 return size; 836 } 837 838 /* signal other side */ 839 virtqueue_fill(q->rx_vq, &elem, total, i++); 840 } 841 842 if (mhdr_cnt) { 843 stw_p(&mhdr.num_buffers, i); 844 iov_from_buf(mhdr_sg, mhdr_cnt, 845 0, 846 &mhdr.num_buffers, sizeof mhdr.num_buffers); 847 } 848 849 virtqueue_flush(q->rx_vq, i); 850 virtio_notify(vdev, q->rx_vq); 851 852 return size; 853 } 854 855 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 856 857 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 858 { 859 VirtIONet *n = qemu_get_nic_opaque(nc); 860 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 861 VirtIODevice *vdev = VIRTIO_DEVICE(n); 862 863 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); 864 virtio_notify(vdev, q->tx_vq); 865 866 q->async_tx.elem.out_num = q->async_tx.len = 0; 867 868 virtio_queue_set_notification(q->tx_vq, 1); 869 virtio_net_flush_tx(q); 870 } 871 872 /* TX */ 873 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 874 { 875 VirtIONet *n = q->n; 876 VirtIODevice *vdev = VIRTIO_DEVICE(n); 877 VirtQueueElement elem; 878 int32_t num_packets = 0; 879 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 880 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 881 return num_packets; 882 } 883 884 assert(vdev->vm_running); 885 886 if (q->async_tx.elem.out_num) { 887 virtio_queue_set_notification(q->tx_vq, 0); 888 return num_packets; 889 } 890 891 while (virtqueue_pop(q->tx_vq, &elem)) { 892 ssize_t ret, len; 893 unsigned int out_num = elem.out_num; 894 struct iovec *out_sg = &elem.out_sg[0]; 895 struct iovec sg[VIRTQUEUE_MAX_SIZE]; 896 897 if (out_num < 1) { 898 error_report("virtio-net header not in first element"); 899 exit(1); 900 } 901 902 /* 903 * If host wants to see the guest header as is, we can 904 * pass it on unchanged. Otherwise, copy just the parts 905 * that host is interested in. 906 */ 907 assert(n->host_hdr_len <= n->guest_hdr_len); 908 if (n->host_hdr_len != n->guest_hdr_len) { 909 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 910 out_sg, out_num, 911 0, n->host_hdr_len); 912 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 913 out_sg, out_num, 914 n->guest_hdr_len, -1); 915 out_num = sg_num; 916 out_sg = sg; 917 } 918 919 len = n->guest_hdr_len; 920 921 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 922 out_sg, out_num, virtio_net_tx_complete); 923 if (ret == 0) { 924 virtio_queue_set_notification(q->tx_vq, 0); 925 q->async_tx.elem = elem; 926 q->async_tx.len = len; 927 return -EBUSY; 928 } 929 930 len += ret; 931 932 virtqueue_push(q->tx_vq, &elem, 0); 933 virtio_notify(vdev, q->tx_vq); 934 935 if (++num_packets >= n->tx_burst) { 936 break; 937 } 938 } 939 return num_packets; 940 } 941 942 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 943 { 944 VirtIONet *n = VIRTIO_NET(vdev); 945 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 946 947 /* This happens when device was stopped but VCPU wasn't. */ 948 if (!vdev->vm_running) { 949 q->tx_waiting = 1; 950 return; 951 } 952 953 if (q->tx_waiting) { 954 virtio_queue_set_notification(vq, 1); 955 qemu_del_timer(q->tx_timer); 956 q->tx_waiting = 0; 957 virtio_net_flush_tx(q); 958 } else { 959 qemu_mod_timer(q->tx_timer, 960 qemu_get_clock_ns(vm_clock) + n->tx_timeout); 961 q->tx_waiting = 1; 962 virtio_queue_set_notification(vq, 0); 963 } 964 } 965 966 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 967 { 968 VirtIONet *n = VIRTIO_NET(vdev); 969 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 970 971 if (unlikely(q->tx_waiting)) { 972 return; 973 } 974 q->tx_waiting = 1; 975 /* This happens when device was stopped but VCPU wasn't. */ 976 if (!vdev->vm_running) { 977 return; 978 } 979 virtio_queue_set_notification(vq, 0); 980 qemu_bh_schedule(q->tx_bh); 981 } 982 983 static void virtio_net_tx_timer(void *opaque) 984 { 985 VirtIONetQueue *q = opaque; 986 VirtIONet *n = q->n; 987 VirtIODevice *vdev = VIRTIO_DEVICE(n); 988 assert(vdev->vm_running); 989 990 q->tx_waiting = 0; 991 992 /* Just in case the driver is not ready on more */ 993 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 994 return; 995 } 996 997 virtio_queue_set_notification(q->tx_vq, 1); 998 virtio_net_flush_tx(q); 999 } 1000 1001 static void virtio_net_tx_bh(void *opaque) 1002 { 1003 VirtIONetQueue *q = opaque; 1004 VirtIONet *n = q->n; 1005 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1006 int32_t ret; 1007 1008 assert(vdev->vm_running); 1009 1010 q->tx_waiting = 0; 1011 1012 /* Just in case the driver is not ready on more */ 1013 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 1014 return; 1015 } 1016 1017 ret = virtio_net_flush_tx(q); 1018 if (ret == -EBUSY) { 1019 return; /* Notification re-enable handled by tx_complete */ 1020 } 1021 1022 /* If we flush a full burst of packets, assume there are 1023 * more coming and immediately reschedule */ 1024 if (ret >= n->tx_burst) { 1025 qemu_bh_schedule(q->tx_bh); 1026 q->tx_waiting = 1; 1027 return; 1028 } 1029 1030 /* If less than a full burst, re-enable notification and flush 1031 * anything that may have come in while we weren't looking. If 1032 * we find something, assume the guest is still active and reschedule */ 1033 virtio_queue_set_notification(q->tx_vq, 1); 1034 if (virtio_net_flush_tx(q) > 0) { 1035 virtio_queue_set_notification(q->tx_vq, 0); 1036 qemu_bh_schedule(q->tx_bh); 1037 q->tx_waiting = 1; 1038 } 1039 } 1040 1041 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) 1042 { 1043 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1044 int i, max = multiqueue ? n->max_queues : 1; 1045 1046 n->multiqueue = multiqueue; 1047 1048 for (i = 2; i <= n->max_queues * 2 + 1; i++) { 1049 virtio_del_queue(vdev, i); 1050 } 1051 1052 for (i = 1; i < max; i++) { 1053 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1054 if (n->vqs[i].tx_timer) { 1055 n->vqs[i].tx_vq = 1056 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); 1057 n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, 1058 virtio_net_tx_timer, 1059 &n->vqs[i]); 1060 } else { 1061 n->vqs[i].tx_vq = 1062 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); 1063 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); 1064 } 1065 1066 n->vqs[i].tx_waiting = 0; 1067 n->vqs[i].n = n; 1068 } 1069 1070 if (ctrl) { 1071 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1072 } 1073 1074 virtio_net_set_queues(n); 1075 } 1076 1077 static void virtio_net_save(QEMUFile *f, void *opaque) 1078 { 1079 int i; 1080 VirtIONet *n = opaque; 1081 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1082 1083 /* At this point, backend must be stopped, otherwise 1084 * it might keep writing to memory. */ 1085 assert(!n->vhost_started); 1086 virtio_save(vdev, f); 1087 1088 qemu_put_buffer(f, n->mac, ETH_ALEN); 1089 qemu_put_be32(f, n->vqs[0].tx_waiting); 1090 qemu_put_be32(f, n->mergeable_rx_bufs); 1091 qemu_put_be16(f, n->status); 1092 qemu_put_byte(f, n->promisc); 1093 qemu_put_byte(f, n->allmulti); 1094 qemu_put_be32(f, n->mac_table.in_use); 1095 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); 1096 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1097 qemu_put_be32(f, n->has_vnet_hdr); 1098 qemu_put_byte(f, n->mac_table.multi_overflow); 1099 qemu_put_byte(f, n->mac_table.uni_overflow); 1100 qemu_put_byte(f, n->alluni); 1101 qemu_put_byte(f, n->nomulti); 1102 qemu_put_byte(f, n->nouni); 1103 qemu_put_byte(f, n->nobcast); 1104 qemu_put_byte(f, n->has_ufo); 1105 if (n->max_queues > 1) { 1106 qemu_put_be16(f, n->max_queues); 1107 qemu_put_be16(f, n->curr_queues); 1108 for (i = 1; i < n->curr_queues; i++) { 1109 qemu_put_be32(f, n->vqs[i].tx_waiting); 1110 } 1111 } 1112 } 1113 1114 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) 1115 { 1116 VirtIONet *n = opaque; 1117 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1118 int ret, i, link_down; 1119 1120 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) 1121 return -EINVAL; 1122 1123 ret = virtio_load(vdev, f); 1124 if (ret) { 1125 return ret; 1126 } 1127 1128 qemu_get_buffer(f, n->mac, ETH_ALEN); 1129 n->vqs[0].tx_waiting = qemu_get_be32(f); 1130 1131 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); 1132 1133 if (version_id >= 3) 1134 n->status = qemu_get_be16(f); 1135 1136 if (version_id >= 4) { 1137 if (version_id < 8) { 1138 n->promisc = qemu_get_be32(f); 1139 n->allmulti = qemu_get_be32(f); 1140 } else { 1141 n->promisc = qemu_get_byte(f); 1142 n->allmulti = qemu_get_byte(f); 1143 } 1144 } 1145 1146 if (version_id >= 5) { 1147 n->mac_table.in_use = qemu_get_be32(f); 1148 /* MAC_TABLE_ENTRIES may be different from the saved image */ 1149 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { 1150 qemu_get_buffer(f, n->mac_table.macs, 1151 n->mac_table.in_use * ETH_ALEN); 1152 } else if (n->mac_table.in_use) { 1153 uint8_t *buf = g_malloc0(n->mac_table.in_use); 1154 qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); 1155 g_free(buf); 1156 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; 1157 n->mac_table.in_use = 0; 1158 } 1159 } 1160 1161 if (version_id >= 6) 1162 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); 1163 1164 if (version_id >= 7) { 1165 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { 1166 error_report("virtio-net: saved image requires vnet_hdr=on"); 1167 return -1; 1168 } 1169 1170 if (n->has_vnet_hdr) { 1171 tap_set_offload(qemu_get_queue(n->nic)->peer, 1172 (vdev->guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1, 1173 (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1, 1174 (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1, 1175 (vdev->guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1, 1176 (vdev->guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1); 1177 } 1178 } 1179 1180 if (version_id >= 9) { 1181 n->mac_table.multi_overflow = qemu_get_byte(f); 1182 n->mac_table.uni_overflow = qemu_get_byte(f); 1183 } 1184 1185 if (version_id >= 10) { 1186 n->alluni = qemu_get_byte(f); 1187 n->nomulti = qemu_get_byte(f); 1188 n->nouni = qemu_get_byte(f); 1189 n->nobcast = qemu_get_byte(f); 1190 } 1191 1192 if (version_id >= 11) { 1193 if (qemu_get_byte(f) && !peer_has_ufo(n)) { 1194 error_report("virtio-net: saved image requires TUN_F_UFO support"); 1195 return -1; 1196 } 1197 } 1198 1199 if (n->max_queues > 1) { 1200 if (n->max_queues != qemu_get_be16(f)) { 1201 error_report("virtio-net: different max_queues "); 1202 return -1; 1203 } 1204 1205 n->curr_queues = qemu_get_be16(f); 1206 for (i = 1; i < n->curr_queues; i++) { 1207 n->vqs[i].tx_waiting = qemu_get_be32(f); 1208 } 1209 } 1210 1211 virtio_net_set_queues(n); 1212 1213 /* Find the first multicast entry in the saved MAC filter */ 1214 for (i = 0; i < n->mac_table.in_use; i++) { 1215 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 1216 break; 1217 } 1218 } 1219 n->mac_table.first_multi = i; 1220 1221 /* nc.link_down can't be migrated, so infer link_down according 1222 * to link status bit in n->status */ 1223 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 1224 for (i = 0; i < n->max_queues; i++) { 1225 qemu_get_subqueue(n->nic, i)->link_down = link_down; 1226 } 1227 1228 return 0; 1229 } 1230 1231 static void virtio_net_cleanup(NetClientState *nc) 1232 { 1233 VirtIONet *n = qemu_get_nic_opaque(nc); 1234 1235 n->nic = NULL; 1236 } 1237 1238 static NetClientInfo net_virtio_info = { 1239 .type = NET_CLIENT_OPTIONS_KIND_NIC, 1240 .size = sizeof(NICState), 1241 .can_receive = virtio_net_can_receive, 1242 .receive = virtio_net_receive, 1243 .cleanup = virtio_net_cleanup, 1244 .link_status_changed = virtio_net_set_link_status, 1245 }; 1246 1247 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 1248 { 1249 VirtIONet *n = VIRTIO_NET(vdev); 1250 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1251 assert(n->vhost_started); 1252 return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx); 1253 } 1254 1255 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 1256 bool mask) 1257 { 1258 VirtIONet *n = VIRTIO_NET(vdev); 1259 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); 1260 assert(n->vhost_started); 1261 vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), 1262 vdev, idx, mask); 1263 } 1264 1265 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) 1266 { 1267 int i, config_size = 0; 1268 for (i = 0; feature_sizes[i].flags != 0; i++) { 1269 if (host_features & feature_sizes[i].flags) { 1270 config_size = MAX(feature_sizes[i].end, config_size); 1271 } 1272 } 1273 n->config_size = config_size; 1274 } 1275 1276 static int virtio_net_device_init(VirtIODevice *vdev) 1277 { 1278 int i; 1279 1280 DeviceState *qdev = DEVICE(vdev); 1281 VirtIONet *n = VIRTIO_NET(vdev); 1282 1283 virtio_init(VIRTIO_DEVICE(n), "virtio-net", VIRTIO_ID_NET, 1284 n->config_size); 1285 1286 vdev->get_config = virtio_net_get_config; 1287 vdev->set_config = virtio_net_set_config; 1288 vdev->get_features = virtio_net_get_features; 1289 vdev->set_features = virtio_net_set_features; 1290 vdev->bad_features = virtio_net_bad_features; 1291 vdev->reset = virtio_net_reset; 1292 vdev->set_status = virtio_net_set_status; 1293 vdev->guest_notifier_mask = virtio_net_guest_notifier_mask; 1294 vdev->guest_notifier_pending = virtio_net_guest_notifier_pending; 1295 n->max_queues = MAX(n->nic_conf.queues, 1); 1296 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); 1297 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); 1298 n->curr_queues = 1; 1299 n->vqs[0].n = n; 1300 n->tx_timeout = n->net_conf.txtimer; 1301 1302 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 1303 && strcmp(n->net_conf.tx, "bh")) { 1304 error_report("virtio-net: " 1305 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 1306 n->net_conf.tx); 1307 error_report("Defaulting to \"bh\""); 1308 } 1309 1310 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 1311 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1312 virtio_net_handle_tx_timer); 1313 n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, 1314 &n->vqs[0]); 1315 } else { 1316 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, 1317 virtio_net_handle_tx_bh); 1318 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); 1319 } 1320 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 1321 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 1322 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 1323 n->status = VIRTIO_NET_S_LINK_UP; 1324 1325 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 1326 object_get_typename(OBJECT(qdev)), qdev->id, n); 1327 peer_test_vnet_hdr(n); 1328 if (peer_has_vnet_hdr(n)) { 1329 for (i = 0; i < n->max_queues; i++) { 1330 tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); 1331 } 1332 n->host_hdr_len = sizeof(struct virtio_net_hdr); 1333 } else { 1334 n->host_hdr_len = 0; 1335 } 1336 1337 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 1338 1339 n->vqs[0].tx_waiting = 0; 1340 n->tx_burst = n->net_conf.txburst; 1341 virtio_net_set_mrg_rx_bufs(n, 0); 1342 n->promisc = 1; /* for compatibility */ 1343 1344 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1345 1346 n->vlans = g_malloc0(MAX_VLAN >> 3); 1347 1348 n->qdev = qdev; 1349 register_savevm(qdev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, 1350 virtio_net_save, virtio_net_load, n); 1351 1352 add_boot_device_path(n->nic_conf.bootindex, qdev, "/ethernet-phy@0"); 1353 return 0; 1354 } 1355 1356 static int virtio_net_device_exit(DeviceState *qdev) 1357 { 1358 VirtIONet *n = VIRTIO_NET(qdev); 1359 VirtIODevice *vdev = VIRTIO_DEVICE(qdev); 1360 int i; 1361 1362 /* This will stop vhost backend if appropriate. */ 1363 virtio_net_set_status(vdev, 0); 1364 1365 unregister_savevm(qdev, "virtio-net", n); 1366 1367 g_free(n->mac_table.macs); 1368 g_free(n->vlans); 1369 1370 for (i = 0; i < n->max_queues; i++) { 1371 VirtIONetQueue *q = &n->vqs[i]; 1372 NetClientState *nc = qemu_get_subqueue(n->nic, i); 1373 1374 qemu_purge_queued_packets(nc); 1375 1376 if (q->tx_timer) { 1377 qemu_del_timer(q->tx_timer); 1378 qemu_free_timer(q->tx_timer); 1379 } else { 1380 qemu_bh_delete(q->tx_bh); 1381 } 1382 } 1383 1384 g_free(n->vqs); 1385 qemu_del_nic(n->nic); 1386 virtio_common_cleanup(vdev); 1387 1388 return 0; 1389 } 1390 1391 static void virtio_net_instance_init(Object *obj) 1392 { 1393 VirtIONet *n = VIRTIO_NET(obj); 1394 1395 /* 1396 * The default config_size is sizeof(struct virtio_net_config). 1397 * Can be overriden with virtio_net_set_config_size. 1398 */ 1399 n->config_size = sizeof(struct virtio_net_config); 1400 } 1401 1402 static Property virtio_net_properties[] = { 1403 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 1404 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 1405 TX_TIMER_INTERVAL), 1406 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 1407 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 1408 DEFINE_PROP_END_OF_LIST(), 1409 }; 1410 1411 static void virtio_net_class_init(ObjectClass *klass, void *data) 1412 { 1413 DeviceClass *dc = DEVICE_CLASS(klass); 1414 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1415 dc->exit = virtio_net_device_exit; 1416 dc->props = virtio_net_properties; 1417 vdc->init = virtio_net_device_init; 1418 vdc->get_config = virtio_net_get_config; 1419 vdc->set_config = virtio_net_set_config; 1420 vdc->get_features = virtio_net_get_features; 1421 vdc->set_features = virtio_net_set_features; 1422 vdc->bad_features = virtio_net_bad_features; 1423 vdc->reset = virtio_net_reset; 1424 vdc->set_status = virtio_net_set_status; 1425 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 1426 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 1427 } 1428 1429 static const TypeInfo virtio_net_info = { 1430 .name = TYPE_VIRTIO_NET, 1431 .parent = TYPE_VIRTIO_DEVICE, 1432 .instance_size = sizeof(VirtIONet), 1433 .instance_init = virtio_net_instance_init, 1434 .class_init = virtio_net_class_init, 1435 }; 1436 1437 static void virtio_register_types(void) 1438 { 1439 type_register_static(&virtio_net_info); 1440 } 1441 1442 type_init(virtio_register_types) 1443