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/osdep.h" 15 #include "qemu/atomic.h" 16 #include "qemu/iov.h" 17 #include "qemu/log.h" 18 #include "qemu/main-loop.h" 19 #include "qemu/module.h" 20 #include "hw/virtio/virtio.h" 21 #include "net/net.h" 22 #include "net/checksum.h" 23 #include "net/tap.h" 24 #include "qemu/error-report.h" 25 #include "qemu/timer.h" 26 #include "qemu/option.h" 27 #include "qemu/option_int.h" 28 #include "qemu/config-file.h" 29 #include "qobject/qdict.h" 30 #include "hw/virtio/virtio-net.h" 31 #include "net/vhost_net.h" 32 #include "net/announce.h" 33 #include "hw/virtio/virtio-bus.h" 34 #include "qapi/error.h" 35 #include "qapi/qapi-events-net.h" 36 #include "hw/qdev-properties.h" 37 #include "qapi/qapi-types-migration.h" 38 #include "qapi/qapi-events-migration.h" 39 #include "hw/virtio/virtio-access.h" 40 #include "migration/misc.h" 41 #include "standard-headers/linux/ethtool.h" 42 #include "system/system.h" 43 #include "system/replay.h" 44 #include "trace.h" 45 #include "monitor/qdev.h" 46 #include "monitor/monitor.h" 47 #include "hw/pci/pci_device.h" 48 #include "net_rx_pkt.h" 49 #include "hw/virtio/vhost.h" 50 #include "system/qtest.h" 51 52 #define VIRTIO_NET_VM_VERSION 11 53 54 /* previously fixed value */ 55 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 56 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256 57 58 /* for now, only allow larger queue_pairs; with virtio-1, guest can downsize */ 59 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 60 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 61 62 #define VIRTIO_NET_IP4_ADDR_SIZE 8 /* ipv4 saddr + daddr */ 63 64 #define VIRTIO_NET_TCP_FLAG 0x3F 65 #define VIRTIO_NET_TCP_HDR_LENGTH 0xF000 66 67 /* IPv4 max payload, 16 bits in the header */ 68 #define VIRTIO_NET_MAX_IP4_PAYLOAD (65535 - sizeof(struct ip_header)) 69 #define VIRTIO_NET_MAX_TCP_PAYLOAD 65535 70 71 /* header length value in ip header without option */ 72 #define VIRTIO_NET_IP4_HEADER_LENGTH 5 73 74 #define VIRTIO_NET_IP6_ADDR_SIZE 32 /* ipv6 saddr + daddr */ 75 #define VIRTIO_NET_MAX_IP6_PAYLOAD VIRTIO_NET_MAX_TCP_PAYLOAD 76 77 /* Purge coalesced packets timer interval, This value affects the performance 78 a lot, and should be tuned carefully, '300000'(300us) is the recommended 79 value to pass the WHQL test, '50000' can gain 2x netperf throughput with 80 tso/gso/gro 'off'. */ 81 #define VIRTIO_NET_RSC_DEFAULT_INTERVAL 300000 82 83 #define VIRTIO_NET_RSS_SUPPORTED_HASHES (VIRTIO_NET_RSS_HASH_TYPE_IPv4 | \ 84 VIRTIO_NET_RSS_HASH_TYPE_TCPv4 | \ 85 VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | \ 86 VIRTIO_NET_RSS_HASH_TYPE_IPv6 | \ 87 VIRTIO_NET_RSS_HASH_TYPE_TCPv6 | \ 88 VIRTIO_NET_RSS_HASH_TYPE_UDPv6 | \ 89 VIRTIO_NET_RSS_HASH_TYPE_IP_EX | \ 90 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | \ 91 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) 92 93 static const VirtIOFeature feature_sizes[] = { 94 {.flags = 1ULL << VIRTIO_NET_F_MAC, 95 .end = endof(struct virtio_net_config, mac)}, 96 {.flags = 1ULL << VIRTIO_NET_F_STATUS, 97 .end = endof(struct virtio_net_config, status)}, 98 {.flags = 1ULL << VIRTIO_NET_F_MQ, 99 .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, 100 {.flags = 1ULL << VIRTIO_NET_F_MTU, 101 .end = endof(struct virtio_net_config, mtu)}, 102 {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX, 103 .end = endof(struct virtio_net_config, duplex)}, 104 {.flags = (1ULL << VIRTIO_NET_F_RSS) | (1ULL << VIRTIO_NET_F_HASH_REPORT), 105 .end = endof(struct virtio_net_config, supported_hash_types)}, 106 {} 107 }; 108 109 static const VirtIOConfigSizeParams cfg_size_params = { 110 .min_size = endof(struct virtio_net_config, mac), 111 .max_size = sizeof(struct virtio_net_config), 112 .feature_sizes = feature_sizes 113 }; 114 115 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) 116 { 117 VirtIONet *n = qemu_get_nic_opaque(nc); 118 119 return &n->vqs[nc->queue_index]; 120 } 121 122 static int vq2q(int queue_index) 123 { 124 return queue_index / 2; 125 } 126 127 static void flush_or_purge_queued_packets(NetClientState *nc) 128 { 129 if (!nc->peer) { 130 return; 131 } 132 133 qemu_flush_or_purge_queued_packets(nc->peer, true); 134 assert(!virtio_net_get_subqueue(nc)->async_tx.elem); 135 } 136 137 /* TODO 138 * - we could suppress RX interrupt if we were so inclined. 139 */ 140 141 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) 142 { 143 VirtIONet *n = VIRTIO_NET(vdev); 144 struct virtio_net_config netcfg; 145 NetClientState *nc = qemu_get_queue(n->nic); 146 static const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } }; 147 148 int ret = 0; 149 memset(&netcfg, 0 , sizeof(struct virtio_net_config)); 150 virtio_stw_p(vdev, &netcfg.status, n->status); 151 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queue_pairs); 152 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); 153 memcpy(netcfg.mac, n->mac, ETH_ALEN); 154 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed); 155 netcfg.duplex = n->net_conf.duplex; 156 netcfg.rss_max_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE; 157 virtio_stw_p(vdev, &netcfg.rss_max_indirection_table_length, 158 virtio_host_has_feature(vdev, VIRTIO_NET_F_RSS) ? 159 VIRTIO_NET_RSS_MAX_TABLE_LEN : 1); 160 virtio_stl_p(vdev, &netcfg.supported_hash_types, 161 VIRTIO_NET_RSS_SUPPORTED_HASHES); 162 memcpy(config, &netcfg, n->config_size); 163 164 /* 165 * Is this VDPA? No peer means not VDPA: there's no way to 166 * disconnect/reconnect a VDPA peer. 167 */ 168 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 169 ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg, 170 n->config_size); 171 if (ret == -1) { 172 return; 173 } 174 175 /* 176 * Some NIC/kernel combinations present 0 as the mac address. As that 177 * is not a legal address, try to proceed with the address from the 178 * QEMU command line in the hope that the address has been configured 179 * correctly elsewhere - just not reported by the device. 180 */ 181 if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) { 182 info_report("Zero hardware mac address detected. Ignoring."); 183 memcpy(netcfg.mac, n->mac, ETH_ALEN); 184 } 185 186 netcfg.status |= virtio_tswap16(vdev, 187 n->status & VIRTIO_NET_S_ANNOUNCE); 188 memcpy(config, &netcfg, n->config_size); 189 } 190 } 191 192 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) 193 { 194 VirtIONet *n = VIRTIO_NET(vdev); 195 struct virtio_net_config netcfg = {}; 196 NetClientState *nc = qemu_get_queue(n->nic); 197 198 memcpy(&netcfg, config, n->config_size); 199 200 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 201 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && 202 memcmp(netcfg.mac, n->mac, ETH_ALEN)) { 203 memcpy(n->mac, netcfg.mac, ETH_ALEN); 204 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 205 } 206 207 /* 208 * Is this VDPA? No peer means not VDPA: there's no way to 209 * disconnect/reconnect a VDPA peer. 210 */ 211 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 212 vhost_net_set_config(get_vhost_net(nc->peer), 213 (uint8_t *)&netcfg, 0, n->config_size, 214 VHOST_SET_CONFIG_TYPE_FRONTEND); 215 } 216 } 217 218 static bool virtio_net_started(VirtIONet *n, uint8_t status) 219 { 220 VirtIODevice *vdev = VIRTIO_DEVICE(n); 221 return (status & VIRTIO_CONFIG_S_DRIVER_OK) && 222 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; 223 } 224 225 static void virtio_net_announce_notify(VirtIONet *net) 226 { 227 VirtIODevice *vdev = VIRTIO_DEVICE(net); 228 trace_virtio_net_announce_notify(); 229 230 net->status |= VIRTIO_NET_S_ANNOUNCE; 231 virtio_notify_config(vdev); 232 } 233 234 static void virtio_net_announce_timer(void *opaque) 235 { 236 VirtIONet *n = opaque; 237 trace_virtio_net_announce_timer(n->announce_timer.round); 238 239 n->announce_timer.round--; 240 virtio_net_announce_notify(n); 241 } 242 243 static void virtio_net_announce(NetClientState *nc) 244 { 245 VirtIONet *n = qemu_get_nic_opaque(nc); 246 VirtIODevice *vdev = VIRTIO_DEVICE(n); 247 248 /* 249 * Make sure the virtio migration announcement timer isn't running 250 * If it is, let it trigger announcement so that we do not cause 251 * confusion. 252 */ 253 if (n->announce_timer.round) { 254 return; 255 } 256 257 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 258 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 259 virtio_net_announce_notify(n); 260 } 261 } 262 263 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) 264 { 265 VirtIODevice *vdev = VIRTIO_DEVICE(n); 266 NetClientState *nc = qemu_get_queue(n->nic); 267 int queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 268 int cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? 269 n->max_ncs - n->max_queue_pairs : 0; 270 271 if (!get_vhost_net(nc->peer)) { 272 return; 273 } 274 275 if ((virtio_net_started(n, status) && !nc->peer->link_down) == 276 !!n->vhost_started) { 277 return; 278 } 279 if (!n->vhost_started) { 280 int r, i; 281 282 if (n->needs_vnet_hdr_swap) { 283 error_report("backend does not support %s vnet headers; " 284 "falling back on userspace virtio", 285 virtio_is_big_endian(vdev) ? "BE" : "LE"); 286 return; 287 } 288 289 /* Any packets outstanding? Purge them to avoid touching rings 290 * when vhost is running. 291 */ 292 for (i = 0; i < queue_pairs; i++) { 293 NetClientState *qnc = qemu_get_subqueue(n->nic, i); 294 295 /* Purge both directions: TX and RX. */ 296 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); 297 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); 298 } 299 300 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { 301 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); 302 if (r < 0) { 303 error_report("%uBytes MTU not supported by the backend", 304 n->net_conf.mtu); 305 306 return; 307 } 308 } 309 310 n->vhost_started = 1; 311 r = vhost_net_start(vdev, n->nic->ncs, queue_pairs, cvq); 312 if (r < 0) { 313 error_report("unable to start vhost net: %d: " 314 "falling back on userspace virtio", -r); 315 n->vhost_started = 0; 316 } 317 } else { 318 vhost_net_stop(vdev, n->nic->ncs, queue_pairs, cvq); 319 n->vhost_started = 0; 320 } 321 } 322 323 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, 324 NetClientState *peer, 325 bool enable) 326 { 327 if (virtio_is_big_endian(vdev)) { 328 return qemu_set_vnet_be(peer, enable); 329 } else { 330 return qemu_set_vnet_le(peer, enable); 331 } 332 } 333 334 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, 335 int queue_pairs, bool enable) 336 { 337 int i; 338 339 for (i = 0; i < queue_pairs; i++) { 340 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && 341 enable) { 342 while (--i >= 0) { 343 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); 344 } 345 346 return true; 347 } 348 } 349 350 return false; 351 } 352 353 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) 354 { 355 VirtIODevice *vdev = VIRTIO_DEVICE(n); 356 int queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 357 358 if (virtio_net_started(n, status)) { 359 /* Before using the device, we tell the network backend about the 360 * endianness to use when parsing vnet headers. If the backend 361 * can't do it, we fallback onto fixing the headers in the core 362 * virtio-net code. 363 */ 364 n->needs_vnet_hdr_swap = n->has_vnet_hdr && 365 virtio_net_set_vnet_endian(vdev, n->nic->ncs, 366 queue_pairs, true); 367 } else if (virtio_net_started(n, vdev->status)) { 368 /* After using the device, we need to reset the network backend to 369 * the default (guest native endianness), otherwise the guest may 370 * lose network connectivity if it is rebooted into a different 371 * endianness. 372 */ 373 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queue_pairs, false); 374 } 375 } 376 377 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) 378 { 379 unsigned int dropped = virtqueue_drop_all(vq); 380 if (dropped) { 381 virtio_notify(vdev, vq); 382 } 383 } 384 385 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) 386 { 387 VirtIONet *n = VIRTIO_NET(vdev); 388 VirtIONetQueue *q; 389 int i; 390 uint8_t queue_status; 391 392 virtio_net_vnet_endian_status(n, status); 393 virtio_net_vhost_status(n, status); 394 395 for (i = 0; i < n->max_queue_pairs; i++) { 396 NetClientState *ncs = qemu_get_subqueue(n->nic, i); 397 bool queue_started; 398 q = &n->vqs[i]; 399 400 if ((!n->multiqueue && i != 0) || i >= n->curr_queue_pairs) { 401 queue_status = 0; 402 } else { 403 queue_status = status; 404 } 405 queue_started = 406 virtio_net_started(n, queue_status) && !n->vhost_started; 407 408 if (queue_started) { 409 qemu_flush_queued_packets(ncs); 410 } 411 412 if (!q->tx_waiting) { 413 continue; 414 } 415 416 if (queue_started) { 417 if (q->tx_timer) { 418 timer_mod(q->tx_timer, 419 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 420 } else { 421 replay_bh_schedule_event(q->tx_bh); 422 } 423 } else { 424 if (q->tx_timer) { 425 timer_del(q->tx_timer); 426 } else { 427 qemu_bh_cancel(q->tx_bh); 428 } 429 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && 430 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) && 431 vdev->vm_running) { 432 /* if tx is waiting we are likely have some packets in tx queue 433 * and disabled notification */ 434 q->tx_waiting = 0; 435 virtio_queue_set_notification(q->tx_vq, 1); 436 virtio_net_drop_tx_queue_data(vdev, q->tx_vq); 437 } 438 } 439 } 440 } 441 442 static void virtio_net_set_link_status(NetClientState *nc) 443 { 444 VirtIONet *n = qemu_get_nic_opaque(nc); 445 VirtIODevice *vdev = VIRTIO_DEVICE(n); 446 uint16_t old_status = n->status; 447 448 if (nc->link_down) 449 n->status &= ~VIRTIO_NET_S_LINK_UP; 450 else 451 n->status |= VIRTIO_NET_S_LINK_UP; 452 453 if (n->status != old_status) 454 virtio_notify_config(vdev); 455 456 virtio_net_set_status(vdev, vdev->status); 457 } 458 459 static void rxfilter_notify(NetClientState *nc) 460 { 461 VirtIONet *n = qemu_get_nic_opaque(nc); 462 463 if (nc->rxfilter_notify_enabled) { 464 char *path = object_get_canonical_path(OBJECT(n->qdev)); 465 qapi_event_send_nic_rx_filter_changed(n->netclient_name, path); 466 g_free(path); 467 468 /* disable event notification to avoid events flooding */ 469 nc->rxfilter_notify_enabled = 0; 470 } 471 } 472 473 static intList *get_vlan_table(VirtIONet *n) 474 { 475 intList *list; 476 int i, j; 477 478 list = NULL; 479 for (i = 0; i < MAX_VLAN >> 5; i++) { 480 for (j = 0; n->vlans[i] && j <= 0x1f; j++) { 481 if (n->vlans[i] & (1U << j)) { 482 QAPI_LIST_PREPEND(list, (i << 5) + j); 483 } 484 } 485 } 486 487 return list; 488 } 489 490 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) 491 { 492 VirtIONet *n = qemu_get_nic_opaque(nc); 493 VirtIODevice *vdev = VIRTIO_DEVICE(n); 494 RxFilterInfo *info; 495 strList *str_list; 496 int i; 497 498 info = g_malloc0(sizeof(*info)); 499 info->name = g_strdup(nc->name); 500 info->promiscuous = n->promisc; 501 502 if (n->nouni) { 503 info->unicast = RX_STATE_NONE; 504 } else if (n->alluni) { 505 info->unicast = RX_STATE_ALL; 506 } else { 507 info->unicast = RX_STATE_NORMAL; 508 } 509 510 if (n->nomulti) { 511 info->multicast = RX_STATE_NONE; 512 } else if (n->allmulti) { 513 info->multicast = RX_STATE_ALL; 514 } else { 515 info->multicast = RX_STATE_NORMAL; 516 } 517 518 info->broadcast_allowed = n->nobcast; 519 info->multicast_overflow = n->mac_table.multi_overflow; 520 info->unicast_overflow = n->mac_table.uni_overflow; 521 522 info->main_mac = qemu_mac_strdup_printf(n->mac); 523 524 str_list = NULL; 525 for (i = 0; i < n->mac_table.first_multi; i++) { 526 QAPI_LIST_PREPEND(str_list, 527 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN)); 528 } 529 info->unicast_table = str_list; 530 531 str_list = NULL; 532 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 533 QAPI_LIST_PREPEND(str_list, 534 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN)); 535 } 536 info->multicast_table = str_list; 537 info->vlan_table = get_vlan_table(n); 538 539 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { 540 info->vlan = RX_STATE_ALL; 541 } else if (!info->vlan_table) { 542 info->vlan = RX_STATE_NONE; 543 } else { 544 info->vlan = RX_STATE_NORMAL; 545 } 546 547 /* enable event notification after query */ 548 nc->rxfilter_notify_enabled = 1; 549 550 return info; 551 } 552 553 static void virtio_net_queue_reset(VirtIODevice *vdev, uint32_t queue_index) 554 { 555 VirtIONet *n = VIRTIO_NET(vdev); 556 NetClientState *nc; 557 558 /* validate queue_index and skip for cvq */ 559 if (queue_index >= n->max_queue_pairs * 2) { 560 return; 561 } 562 563 nc = qemu_get_subqueue(n->nic, vq2q(queue_index)); 564 565 if (!nc->peer) { 566 return; 567 } 568 569 if (get_vhost_net(nc->peer) && 570 nc->peer->info->type == NET_CLIENT_DRIVER_TAP) { 571 vhost_net_virtqueue_reset(vdev, nc, queue_index); 572 } 573 574 flush_or_purge_queued_packets(nc); 575 } 576 577 static void virtio_net_queue_enable(VirtIODevice *vdev, uint32_t queue_index) 578 { 579 VirtIONet *n = VIRTIO_NET(vdev); 580 NetClientState *nc; 581 int r; 582 583 /* validate queue_index and skip for cvq */ 584 if (queue_index >= n->max_queue_pairs * 2) { 585 return; 586 } 587 588 nc = qemu_get_subqueue(n->nic, vq2q(queue_index)); 589 590 if (!nc->peer || !vdev->vhost_started) { 591 return; 592 } 593 594 if (get_vhost_net(nc->peer) && 595 nc->peer->info->type == NET_CLIENT_DRIVER_TAP) { 596 r = vhost_net_virtqueue_restart(vdev, nc, queue_index); 597 if (r < 0) { 598 error_report("unable to restart vhost net virtqueue: %d, " 599 "when resetting the queue", queue_index); 600 } 601 } 602 } 603 604 static void peer_test_vnet_hdr(VirtIONet *n) 605 { 606 NetClientState *nc = qemu_get_queue(n->nic); 607 if (!nc->peer) { 608 return; 609 } 610 611 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); 612 } 613 614 static int peer_has_vnet_hdr(VirtIONet *n) 615 { 616 return n->has_vnet_hdr; 617 } 618 619 static int peer_has_ufo(VirtIONet *n) 620 { 621 if (!peer_has_vnet_hdr(n)) 622 return 0; 623 624 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); 625 626 return n->has_ufo; 627 } 628 629 static int peer_has_uso(VirtIONet *n) 630 { 631 if (!peer_has_vnet_hdr(n)) { 632 return 0; 633 } 634 635 return qemu_has_uso(qemu_get_queue(n->nic)->peer); 636 } 637 638 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, 639 int version_1, int hash_report) 640 { 641 int i; 642 NetClientState *nc; 643 644 n->mergeable_rx_bufs = mergeable_rx_bufs; 645 646 if (version_1) { 647 n->guest_hdr_len = hash_report ? 648 sizeof(struct virtio_net_hdr_v1_hash) : 649 sizeof(struct virtio_net_hdr_mrg_rxbuf); 650 n->rss_data.populate_hash = !!hash_report; 651 } else { 652 n->guest_hdr_len = n->mergeable_rx_bufs ? 653 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 654 sizeof(struct virtio_net_hdr); 655 n->rss_data.populate_hash = false; 656 } 657 658 for (i = 0; i < n->max_queue_pairs; i++) { 659 nc = qemu_get_subqueue(n->nic, i); 660 661 if (peer_has_vnet_hdr(n) && 662 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { 663 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); 664 n->host_hdr_len = n->guest_hdr_len; 665 } 666 } 667 } 668 669 static int virtio_net_max_tx_queue_size(VirtIONet *n) 670 { 671 NetClientState *peer = n->nic_conf.peers.ncs[0]; 672 673 /* 674 * Backends other than vhost-user or vhost-vdpa don't support max queue 675 * size. 676 */ 677 if (!peer) { 678 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 679 } 680 681 switch(peer->info->type) { 682 case NET_CLIENT_DRIVER_VHOST_USER: 683 case NET_CLIENT_DRIVER_VHOST_VDPA: 684 return VIRTQUEUE_MAX_SIZE; 685 default: 686 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; 687 }; 688 } 689 690 static int peer_attach(VirtIONet *n, int index) 691 { 692 NetClientState *nc = qemu_get_subqueue(n->nic, index); 693 694 if (!nc->peer) { 695 return 0; 696 } 697 698 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 699 vhost_set_vring_enable(nc->peer, 1); 700 } 701 702 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 703 return 0; 704 } 705 706 if (n->max_queue_pairs == 1) { 707 return 0; 708 } 709 710 return tap_enable(nc->peer); 711 } 712 713 static int peer_detach(VirtIONet *n, int index) 714 { 715 NetClientState *nc = qemu_get_subqueue(n->nic, index); 716 717 if (!nc->peer) { 718 return 0; 719 } 720 721 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { 722 vhost_set_vring_enable(nc->peer, 0); 723 } 724 725 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { 726 return 0; 727 } 728 729 return tap_disable(nc->peer); 730 } 731 732 static void virtio_net_set_queue_pairs(VirtIONet *n) 733 { 734 int i; 735 int r; 736 737 if (n->nic->peer_deleted) { 738 return; 739 } 740 741 for (i = 0; i < n->max_queue_pairs; i++) { 742 if (i < n->curr_queue_pairs) { 743 r = peer_attach(n, i); 744 assert(!r); 745 } else { 746 r = peer_detach(n, i); 747 assert(!r); 748 } 749 } 750 } 751 752 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); 753 754 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, 755 Error **errp) 756 { 757 VirtIONet *n = VIRTIO_NET(vdev); 758 NetClientState *nc = qemu_get_queue(n->nic); 759 760 /* Firstly sync all virtio-net possible supported features */ 761 features |= n->host_features; 762 763 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 764 765 if (!peer_has_vnet_hdr(n)) { 766 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); 767 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); 768 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); 769 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); 770 771 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); 772 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); 773 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); 774 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); 775 776 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO); 777 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4); 778 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6); 779 780 virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); 781 } 782 783 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { 784 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); 785 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); 786 } 787 788 if (!peer_has_uso(n)) { 789 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO); 790 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4); 791 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6); 792 } 793 794 if (!get_vhost_net(nc->peer)) { 795 return features; 796 } 797 798 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { 799 virtio_clear_feature(&features, VIRTIO_NET_F_RSS); 800 } 801 features = vhost_net_get_features(get_vhost_net(nc->peer), features); 802 vdev->backend_features = features; 803 804 if (n->mtu_bypass_backend && 805 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { 806 features |= (1ULL << VIRTIO_NET_F_MTU); 807 } 808 809 /* 810 * Since GUEST_ANNOUNCE is emulated the feature bit could be set without 811 * enabled. This happens in the vDPA case. 812 * 813 * Make sure the feature set is not incoherent, as the driver could refuse 814 * to start. 815 * 816 * TODO: QEMU is able to emulate a CVQ just for guest_announce purposes, 817 * helping guest to notify the new location with vDPA devices that does not 818 * support it. 819 */ 820 if (!virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_CTRL_VQ)) { 821 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ANNOUNCE); 822 } 823 824 return features; 825 } 826 827 static uint64_t virtio_net_bad_features(VirtIODevice *vdev) 828 { 829 uint64_t features = 0; 830 831 /* Linux kernel 2.6.25. It understood MAC (as everyone must), 832 * but also these: */ 833 virtio_add_feature(&features, VIRTIO_NET_F_MAC); 834 virtio_add_feature(&features, VIRTIO_NET_F_CSUM); 835 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); 836 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); 837 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); 838 839 return features; 840 } 841 842 static void virtio_net_apply_guest_offloads(VirtIONet *n) 843 { 844 qemu_set_offload(qemu_get_queue(n->nic)->peer, 845 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), 846 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), 847 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), 848 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), 849 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)), 850 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_USO4)), 851 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_USO6))); 852 } 853 854 static uint64_t virtio_net_guest_offloads_by_features(uint64_t features) 855 { 856 static const uint64_t guest_offloads_mask = 857 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | 858 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | 859 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | 860 (1ULL << VIRTIO_NET_F_GUEST_ECN) | 861 (1ULL << VIRTIO_NET_F_GUEST_UFO) | 862 (1ULL << VIRTIO_NET_F_GUEST_USO4) | 863 (1ULL << VIRTIO_NET_F_GUEST_USO6); 864 865 return guest_offloads_mask & features; 866 } 867 868 uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n) 869 { 870 VirtIODevice *vdev = VIRTIO_DEVICE(n); 871 return virtio_net_guest_offloads_by_features(vdev->guest_features); 872 } 873 874 typedef struct { 875 VirtIONet *n; 876 DeviceState *dev; 877 } FailoverDevice; 878 879 /** 880 * Set the failover primary device 881 * 882 * @opaque: FailoverId to setup 883 * @opts: opts for device we are handling 884 * @errp: returns an error if this function fails 885 */ 886 static int failover_set_primary(DeviceState *dev, void *opaque) 887 { 888 FailoverDevice *fdev = opaque; 889 PCIDevice *pci_dev = (PCIDevice *) 890 object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE); 891 892 if (!pci_dev) { 893 return 0; 894 } 895 896 if (!g_strcmp0(pci_dev->failover_pair_id, fdev->n->netclient_name)) { 897 fdev->dev = dev; 898 return 1; 899 } 900 901 return 0; 902 } 903 904 /** 905 * Find the primary device for this failover virtio-net 906 * 907 * @n: VirtIONet device 908 * @errp: returns an error if this function fails 909 */ 910 static DeviceState *failover_find_primary_device(VirtIONet *n) 911 { 912 FailoverDevice fdev = { 913 .n = n, 914 }; 915 916 qbus_walk_children(sysbus_get_default(), failover_set_primary, NULL, 917 NULL, NULL, &fdev); 918 return fdev.dev; 919 } 920 921 static void failover_add_primary(VirtIONet *n, Error **errp) 922 { 923 Error *err = NULL; 924 DeviceState *dev = failover_find_primary_device(n); 925 926 if (dev) { 927 return; 928 } 929 930 if (!n->primary_opts) { 931 error_setg(errp, "Primary device not found"); 932 error_append_hint(errp, "Virtio-net failover will not work. Make " 933 "sure primary device has parameter" 934 " failover_pair_id=%s\n", n->netclient_name); 935 return; 936 } 937 938 dev = qdev_device_add_from_qdict(n->primary_opts, 939 n->primary_opts_from_json, 940 &err); 941 if (err) { 942 qobject_unref(n->primary_opts); 943 n->primary_opts = NULL; 944 } else { 945 object_unref(OBJECT(dev)); 946 } 947 error_propagate(errp, err); 948 } 949 950 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) 951 { 952 VirtIONet *n = VIRTIO_NET(vdev); 953 Error *err = NULL; 954 int i; 955 956 if (n->mtu_bypass_backend && 957 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { 958 features &= ~(1ULL << VIRTIO_NET_F_MTU); 959 } 960 961 virtio_net_set_multiqueue(n, 962 virtio_has_feature(features, VIRTIO_NET_F_RSS) || 963 virtio_has_feature(features, VIRTIO_NET_F_MQ)); 964 965 virtio_net_set_mrg_rx_bufs(n, 966 virtio_has_feature(features, 967 VIRTIO_NET_F_MRG_RXBUF), 968 virtio_has_feature(features, 969 VIRTIO_F_VERSION_1), 970 virtio_has_feature(features, 971 VIRTIO_NET_F_HASH_REPORT)); 972 973 n->rsc4_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) && 974 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4); 975 n->rsc6_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) && 976 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6); 977 n->rss_data.redirect = virtio_has_feature(features, VIRTIO_NET_F_RSS); 978 979 if (n->has_vnet_hdr) { 980 n->curr_guest_offloads = 981 virtio_net_guest_offloads_by_features(features); 982 virtio_net_apply_guest_offloads(n); 983 } 984 985 for (i = 0; i < n->max_queue_pairs; i++) { 986 NetClientState *nc = qemu_get_subqueue(n->nic, i); 987 988 if (!get_vhost_net(nc->peer)) { 989 continue; 990 } 991 vhost_net_ack_features(get_vhost_net(nc->peer), features); 992 993 /* 994 * keep acked_features in NetVhostUserState up-to-date so it 995 * can't miss any features configured by guest virtio driver. 996 */ 997 vhost_net_save_acked_features(nc->peer); 998 } 999 1000 if (!virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { 1001 memset(n->vlans, 0xff, MAX_VLAN >> 3); 1002 } 1003 1004 if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) { 1005 qapi_event_send_failover_negotiated(n->netclient_name); 1006 qatomic_set(&n->failover_primary_hidden, false); 1007 failover_add_primary(n, &err); 1008 if (err) { 1009 if (!qtest_enabled()) { 1010 warn_report_err(err); 1011 } else { 1012 error_free(err); 1013 } 1014 } 1015 } 1016 } 1017 1018 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, 1019 struct iovec *iov, unsigned int iov_cnt) 1020 { 1021 uint8_t on; 1022 size_t s; 1023 NetClientState *nc = qemu_get_queue(n->nic); 1024 1025 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); 1026 if (s != sizeof(on)) { 1027 return VIRTIO_NET_ERR; 1028 } 1029 1030 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { 1031 n->promisc = on; 1032 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { 1033 n->allmulti = on; 1034 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { 1035 n->alluni = on; 1036 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { 1037 n->nomulti = on; 1038 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { 1039 n->nouni = on; 1040 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { 1041 n->nobcast = on; 1042 } else { 1043 return VIRTIO_NET_ERR; 1044 } 1045 1046 rxfilter_notify(nc); 1047 1048 return VIRTIO_NET_OK; 1049 } 1050 1051 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, 1052 struct iovec *iov, unsigned int iov_cnt) 1053 { 1054 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1055 uint64_t offloads; 1056 size_t s; 1057 1058 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 1059 return VIRTIO_NET_ERR; 1060 } 1061 1062 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); 1063 if (s != sizeof(offloads)) { 1064 return VIRTIO_NET_ERR; 1065 } 1066 1067 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { 1068 uint64_t supported_offloads; 1069 1070 offloads = virtio_ldq_p(vdev, &offloads); 1071 1072 if (!n->has_vnet_hdr) { 1073 return VIRTIO_NET_ERR; 1074 } 1075 1076 n->rsc4_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) && 1077 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO4); 1078 n->rsc6_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) && 1079 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO6); 1080 virtio_clear_feature(&offloads, VIRTIO_NET_F_RSC_EXT); 1081 1082 supported_offloads = virtio_net_supported_guest_offloads(n); 1083 if (offloads & ~supported_offloads) { 1084 return VIRTIO_NET_ERR; 1085 } 1086 1087 n->curr_guest_offloads = offloads; 1088 virtio_net_apply_guest_offloads(n); 1089 1090 return VIRTIO_NET_OK; 1091 } else { 1092 return VIRTIO_NET_ERR; 1093 } 1094 } 1095 1096 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, 1097 struct iovec *iov, unsigned int iov_cnt) 1098 { 1099 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1100 struct virtio_net_ctrl_mac mac_data; 1101 size_t s; 1102 NetClientState *nc = qemu_get_queue(n->nic); 1103 1104 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { 1105 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { 1106 return VIRTIO_NET_ERR; 1107 } 1108 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); 1109 assert(s == sizeof(n->mac)); 1110 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 1111 rxfilter_notify(nc); 1112 1113 return VIRTIO_NET_OK; 1114 } 1115 1116 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { 1117 return VIRTIO_NET_ERR; 1118 } 1119 1120 int in_use = 0; 1121 int first_multi = 0; 1122 uint8_t uni_overflow = 0; 1123 uint8_t multi_overflow = 0; 1124 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 1125 1126 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 1127 sizeof(mac_data.entries)); 1128 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 1129 if (s != sizeof(mac_data.entries)) { 1130 goto error; 1131 } 1132 iov_discard_front(&iov, &iov_cnt, s); 1133 1134 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { 1135 goto error; 1136 } 1137 1138 if (mac_data.entries <= MAC_TABLE_ENTRIES) { 1139 s = iov_to_buf(iov, iov_cnt, 0, macs, 1140 mac_data.entries * ETH_ALEN); 1141 if (s != mac_data.entries * ETH_ALEN) { 1142 goto error; 1143 } 1144 in_use += mac_data.entries; 1145 } else { 1146 uni_overflow = 1; 1147 } 1148 1149 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); 1150 1151 first_multi = in_use; 1152 1153 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, 1154 sizeof(mac_data.entries)); 1155 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); 1156 if (s != sizeof(mac_data.entries)) { 1157 goto error; 1158 } 1159 1160 iov_discard_front(&iov, &iov_cnt, s); 1161 1162 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { 1163 goto error; 1164 } 1165 1166 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { 1167 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], 1168 mac_data.entries * ETH_ALEN); 1169 if (s != mac_data.entries * ETH_ALEN) { 1170 goto error; 1171 } 1172 in_use += mac_data.entries; 1173 } else { 1174 multi_overflow = 1; 1175 } 1176 1177 n->mac_table.in_use = in_use; 1178 n->mac_table.first_multi = first_multi; 1179 n->mac_table.uni_overflow = uni_overflow; 1180 n->mac_table.multi_overflow = multi_overflow; 1181 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); 1182 g_free(macs); 1183 rxfilter_notify(nc); 1184 1185 return VIRTIO_NET_OK; 1186 1187 error: 1188 g_free(macs); 1189 return VIRTIO_NET_ERR; 1190 } 1191 1192 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, 1193 struct iovec *iov, unsigned int iov_cnt) 1194 { 1195 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1196 uint16_t vid; 1197 size_t s; 1198 NetClientState *nc = qemu_get_queue(n->nic); 1199 1200 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); 1201 vid = virtio_lduw_p(vdev, &vid); 1202 if (s != sizeof(vid)) { 1203 return VIRTIO_NET_ERR; 1204 } 1205 1206 if (vid >= MAX_VLAN) 1207 return VIRTIO_NET_ERR; 1208 1209 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) 1210 n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); 1211 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) 1212 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); 1213 else 1214 return VIRTIO_NET_ERR; 1215 1216 rxfilter_notify(nc); 1217 1218 return VIRTIO_NET_OK; 1219 } 1220 1221 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, 1222 struct iovec *iov, unsigned int iov_cnt) 1223 { 1224 trace_virtio_net_handle_announce(n->announce_timer.round); 1225 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && 1226 n->status & VIRTIO_NET_S_ANNOUNCE) { 1227 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 1228 if (n->announce_timer.round) { 1229 qemu_announce_timer_step(&n->announce_timer); 1230 } 1231 return VIRTIO_NET_OK; 1232 } else { 1233 return VIRTIO_NET_ERR; 1234 } 1235 } 1236 1237 static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd) 1238 { 1239 NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0); 1240 if (nc == NULL || nc->info->set_steering_ebpf == NULL) { 1241 return false; 1242 } 1243 1244 trace_virtio_net_rss_attach_ebpf(nic, prog_fd); 1245 return nc->info->set_steering_ebpf(nc, prog_fd); 1246 } 1247 1248 static void rss_data_to_rss_config(struct VirtioNetRssData *data, 1249 struct EBPFRSSConfig *config) 1250 { 1251 config->redirect = data->redirect; 1252 config->populate_hash = data->populate_hash; 1253 config->hash_types = data->hash_types; 1254 config->indirections_len = data->indirections_len; 1255 config->default_queue = data->default_queue; 1256 } 1257 1258 static bool virtio_net_attach_ebpf_rss(VirtIONet *n) 1259 { 1260 struct EBPFRSSConfig config = {}; 1261 1262 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { 1263 return false; 1264 } 1265 1266 rss_data_to_rss_config(&n->rss_data, &config); 1267 1268 if (!ebpf_rss_set_all(&n->ebpf_rss, &config, 1269 n->rss_data.indirections_table, n->rss_data.key, 1270 NULL)) { 1271 return false; 1272 } 1273 1274 if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) { 1275 return false; 1276 } 1277 1278 return true; 1279 } 1280 1281 static void virtio_net_detach_ebpf_rss(VirtIONet *n) 1282 { 1283 virtio_net_attach_ebpf_to_backend(n->nic, -1); 1284 } 1285 1286 static void virtio_net_commit_rss_config(VirtIONet *n) 1287 { 1288 if (n->rss_data.enabled) { 1289 n->rss_data.enabled_software_rss = n->rss_data.populate_hash; 1290 if (n->rss_data.populate_hash) { 1291 virtio_net_detach_ebpf_rss(n); 1292 } else if (!virtio_net_attach_ebpf_rss(n)) { 1293 if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { 1294 warn_report("Can't load eBPF RSS for vhost"); 1295 } else { 1296 warn_report("Can't load eBPF RSS - fallback to software RSS"); 1297 n->rss_data.enabled_software_rss = true; 1298 } 1299 } 1300 1301 trace_virtio_net_rss_enable(n, 1302 n->rss_data.hash_types, 1303 n->rss_data.indirections_len, 1304 sizeof(n->rss_data.key)); 1305 } else { 1306 virtio_net_detach_ebpf_rss(n); 1307 trace_virtio_net_rss_disable(n); 1308 } 1309 } 1310 1311 static void virtio_net_disable_rss(VirtIONet *n) 1312 { 1313 if (!n->rss_data.enabled) { 1314 return; 1315 } 1316 1317 n->rss_data.enabled = false; 1318 virtio_net_commit_rss_config(n); 1319 } 1320 1321 static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp) 1322 { 1323 int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1}; 1324 int ret = true; 1325 int i = 0; 1326 1327 if (n->nr_ebpf_rss_fds != EBPF_RSS_MAX_FDS) { 1328 error_setg(errp, "Expected %d file descriptors but got %d", 1329 EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds); 1330 return false; 1331 } 1332 1333 for (i = 0; i < n->nr_ebpf_rss_fds; i++) { 1334 fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], errp); 1335 if (fds[i] < 0) { 1336 ret = false; 1337 goto exit; 1338 } 1339 } 1340 1341 ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3], errp); 1342 1343 exit: 1344 if (!ret) { 1345 for (i = 0; i < n->nr_ebpf_rss_fds && fds[i] != -1; i++) { 1346 close(fds[i]); 1347 } 1348 } 1349 1350 return ret; 1351 } 1352 1353 static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp) 1354 { 1355 if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) { 1356 return true; 1357 } 1358 1359 trace_virtio_net_rss_load(n, n->nr_ebpf_rss_fds, n->ebpf_rss_fds); 1360 1361 /* 1362 * If user explicitly gave QEMU RSS FDs to use, then 1363 * failing to use them must be considered a fatal 1364 * error. If no RSS FDs were provided, QEMU is trying 1365 * eBPF on a "best effort" basis only, so report a 1366 * warning and allow fallback to software RSS. 1367 */ 1368 if (n->ebpf_rss_fds) { 1369 return virtio_net_load_ebpf_fds(n, errp); 1370 } 1371 1372 ebpf_rss_load(&n->ebpf_rss, &error_warn); 1373 return true; 1374 } 1375 1376 static void virtio_net_unload_ebpf(VirtIONet *n) 1377 { 1378 virtio_net_attach_ebpf_to_backend(n->nic, -1); 1379 ebpf_rss_unload(&n->ebpf_rss); 1380 } 1381 1382 static uint16_t virtio_net_handle_rss(VirtIONet *n, 1383 struct iovec *iov, 1384 unsigned int iov_cnt, 1385 bool do_rss) 1386 { 1387 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1388 struct virtio_net_rss_config cfg; 1389 size_t s, offset = 0, size_get; 1390 uint16_t queue_pairs, i; 1391 struct { 1392 uint16_t us; 1393 uint8_t b; 1394 } QEMU_PACKED temp; 1395 const char *err_msg = ""; 1396 uint32_t err_value = 0; 1397 1398 if (do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_RSS)) { 1399 err_msg = "RSS is not negotiated"; 1400 goto error; 1401 } 1402 if (!do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) { 1403 err_msg = "Hash report is not negotiated"; 1404 goto error; 1405 } 1406 size_get = offsetof(struct virtio_net_rss_config, indirection_table); 1407 s = iov_to_buf(iov, iov_cnt, offset, &cfg, size_get); 1408 if (s != size_get) { 1409 err_msg = "Short command buffer"; 1410 err_value = (uint32_t)s; 1411 goto error; 1412 } 1413 n->rss_data.hash_types = virtio_ldl_p(vdev, &cfg.hash_types); 1414 n->rss_data.indirections_len = 1415 virtio_lduw_p(vdev, &cfg.indirection_table_mask); 1416 if (!do_rss) { 1417 n->rss_data.indirections_len = 0; 1418 } 1419 if (n->rss_data.indirections_len >= VIRTIO_NET_RSS_MAX_TABLE_LEN) { 1420 err_msg = "Too large indirection table"; 1421 err_value = n->rss_data.indirections_len; 1422 goto error; 1423 } 1424 n->rss_data.indirections_len++; 1425 if (!is_power_of_2(n->rss_data.indirections_len)) { 1426 err_msg = "Invalid size of indirection table"; 1427 err_value = n->rss_data.indirections_len; 1428 goto error; 1429 } 1430 n->rss_data.default_queue = do_rss ? 1431 virtio_lduw_p(vdev, &cfg.unclassified_queue) : 0; 1432 if (n->rss_data.default_queue >= n->max_queue_pairs) { 1433 err_msg = "Invalid default queue"; 1434 err_value = n->rss_data.default_queue; 1435 goto error; 1436 } 1437 offset += size_get; 1438 size_get = sizeof(uint16_t) * n->rss_data.indirections_len; 1439 g_free(n->rss_data.indirections_table); 1440 n->rss_data.indirections_table = g_malloc(size_get); 1441 if (!n->rss_data.indirections_table) { 1442 err_msg = "Can't allocate indirections table"; 1443 err_value = n->rss_data.indirections_len; 1444 goto error; 1445 } 1446 s = iov_to_buf(iov, iov_cnt, offset, 1447 n->rss_data.indirections_table, size_get); 1448 if (s != size_get) { 1449 err_msg = "Short indirection table buffer"; 1450 err_value = (uint32_t)s; 1451 goto error; 1452 } 1453 for (i = 0; i < n->rss_data.indirections_len; ++i) { 1454 uint16_t val = n->rss_data.indirections_table[i]; 1455 n->rss_data.indirections_table[i] = virtio_lduw_p(vdev, &val); 1456 } 1457 offset += size_get; 1458 size_get = sizeof(temp); 1459 s = iov_to_buf(iov, iov_cnt, offset, &temp, size_get); 1460 if (s != size_get) { 1461 err_msg = "Can't get queue_pairs"; 1462 err_value = (uint32_t)s; 1463 goto error; 1464 } 1465 queue_pairs = do_rss ? virtio_lduw_p(vdev, &temp.us) : n->curr_queue_pairs; 1466 if (queue_pairs == 0 || queue_pairs > n->max_queue_pairs) { 1467 err_msg = "Invalid number of queue_pairs"; 1468 err_value = queue_pairs; 1469 goto error; 1470 } 1471 if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) { 1472 err_msg = "Invalid key size"; 1473 err_value = temp.b; 1474 goto error; 1475 } 1476 if (!temp.b && n->rss_data.hash_types) { 1477 err_msg = "No key provided"; 1478 err_value = 0; 1479 goto error; 1480 } 1481 if (!temp.b && !n->rss_data.hash_types) { 1482 virtio_net_disable_rss(n); 1483 return queue_pairs; 1484 } 1485 offset += size_get; 1486 size_get = temp.b; 1487 s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get); 1488 if (s != size_get) { 1489 err_msg = "Can get key buffer"; 1490 err_value = (uint32_t)s; 1491 goto error; 1492 } 1493 n->rss_data.enabled = true; 1494 virtio_net_commit_rss_config(n); 1495 return queue_pairs; 1496 error: 1497 trace_virtio_net_rss_error(n, err_msg, err_value); 1498 virtio_net_disable_rss(n); 1499 return 0; 1500 } 1501 1502 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 1503 struct iovec *iov, unsigned int iov_cnt) 1504 { 1505 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1506 uint16_t queue_pairs; 1507 NetClientState *nc = qemu_get_queue(n->nic); 1508 1509 virtio_net_disable_rss(n); 1510 if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) { 1511 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, false); 1512 return queue_pairs ? VIRTIO_NET_OK : VIRTIO_NET_ERR; 1513 } 1514 if (cmd == VIRTIO_NET_CTRL_MQ_RSS_CONFIG) { 1515 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, true); 1516 } else if (cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 1517 struct virtio_net_ctrl_mq mq; 1518 size_t s; 1519 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ)) { 1520 return VIRTIO_NET_ERR; 1521 } 1522 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 1523 if (s != sizeof(mq)) { 1524 return VIRTIO_NET_ERR; 1525 } 1526 queue_pairs = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 1527 1528 } else { 1529 return VIRTIO_NET_ERR; 1530 } 1531 1532 if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1533 queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1534 queue_pairs > n->max_queue_pairs || 1535 !n->multiqueue) { 1536 return VIRTIO_NET_ERR; 1537 } 1538 1539 n->curr_queue_pairs = queue_pairs; 1540 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 1541 /* 1542 * Avoid updating the backend for a vdpa device: We're only interested 1543 * in updating the device model queues. 1544 */ 1545 return VIRTIO_NET_OK; 1546 } 1547 /* stop the backend before changing the number of queue_pairs to avoid handling a 1548 * disabled queue */ 1549 virtio_net_set_status(vdev, vdev->status); 1550 virtio_net_set_queue_pairs(n); 1551 1552 return VIRTIO_NET_OK; 1553 } 1554 1555 size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev, 1556 const struct iovec *in_sg, unsigned in_num, 1557 const struct iovec *out_sg, 1558 unsigned out_num) 1559 { 1560 VirtIONet *n = VIRTIO_NET(vdev); 1561 struct virtio_net_ctrl_hdr ctrl; 1562 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 1563 size_t s; 1564 struct iovec *iov, *iov2; 1565 1566 if (iov_size(in_sg, in_num) < sizeof(status) || 1567 iov_size(out_sg, out_num) < sizeof(ctrl)) { 1568 virtio_error(vdev, "virtio-net ctrl missing headers"); 1569 return 0; 1570 } 1571 1572 iov2 = iov = g_memdup2(out_sg, sizeof(struct iovec) * out_num); 1573 s = iov_to_buf(iov, out_num, 0, &ctrl, sizeof(ctrl)); 1574 iov_discard_front(&iov, &out_num, sizeof(ctrl)); 1575 if (s != sizeof(ctrl)) { 1576 status = VIRTIO_NET_ERR; 1577 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 1578 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, out_num); 1579 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 1580 status = virtio_net_handle_mac(n, ctrl.cmd, iov, out_num); 1581 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 1582 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, out_num); 1583 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 1584 status = virtio_net_handle_announce(n, ctrl.cmd, iov, out_num); 1585 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 1586 status = virtio_net_handle_mq(n, ctrl.cmd, iov, out_num); 1587 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 1588 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, out_num); 1589 } 1590 1591 s = iov_from_buf(in_sg, in_num, 0, &status, sizeof(status)); 1592 assert(s == sizeof(status)); 1593 1594 g_free(iov2); 1595 return sizeof(status); 1596 } 1597 1598 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 1599 { 1600 VirtQueueElement *elem; 1601 1602 for (;;) { 1603 size_t written; 1604 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 1605 if (!elem) { 1606 break; 1607 } 1608 1609 written = virtio_net_handle_ctrl_iov(vdev, elem->in_sg, elem->in_num, 1610 elem->out_sg, elem->out_num); 1611 if (written > 0) { 1612 virtqueue_push(vq, elem, written); 1613 virtio_notify(vdev, vq); 1614 g_free(elem); 1615 } else { 1616 virtqueue_detach_element(vq, elem, 0); 1617 g_free(elem); 1618 break; 1619 } 1620 } 1621 } 1622 1623 /* RX */ 1624 1625 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 1626 { 1627 VirtIONet *n = VIRTIO_NET(vdev); 1628 int queue_index = vq2q(virtio_get_queue_index(vq)); 1629 1630 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 1631 } 1632 1633 static bool virtio_net_can_receive(NetClientState *nc) 1634 { 1635 VirtIONet *n = qemu_get_nic_opaque(nc); 1636 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1637 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1638 1639 if (!vdev->vm_running) { 1640 return false; 1641 } 1642 1643 if (nc->queue_index >= n->curr_queue_pairs) { 1644 return false; 1645 } 1646 1647 if (!virtio_queue_ready(q->rx_vq) || 1648 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1649 return false; 1650 } 1651 1652 return true; 1653 } 1654 1655 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1656 { 1657 int opaque; 1658 unsigned int in_bytes; 1659 VirtIONet *n = q->n; 1660 1661 while (virtio_queue_empty(q->rx_vq) || n->mergeable_rx_bufs) { 1662 opaque = virtqueue_get_avail_bytes(q->rx_vq, &in_bytes, NULL, 1663 bufsize, 0); 1664 /* Buffer is enough, disable notifiaction */ 1665 if (bufsize <= in_bytes) { 1666 break; 1667 } 1668 1669 if (virtio_queue_enable_notification_and_check(q->rx_vq, opaque)) { 1670 /* Guest has added some buffers, try again */ 1671 continue; 1672 } else { 1673 return 0; 1674 } 1675 } 1676 1677 virtio_queue_set_notification(q->rx_vq, 0); 1678 1679 return 1; 1680 } 1681 1682 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1683 { 1684 virtio_tswap16s(vdev, &hdr->hdr_len); 1685 virtio_tswap16s(vdev, &hdr->gso_size); 1686 virtio_tswap16s(vdev, &hdr->csum_start); 1687 virtio_tswap16s(vdev, &hdr->csum_offset); 1688 } 1689 1690 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1691 * it never finds out that the packets don't have valid checksums. This 1692 * causes dhclient to get upset. Fedora's carried a patch for ages to 1693 * fix this with Xen but it hasn't appeared in an upstream release of 1694 * dhclient yet. 1695 * 1696 * To avoid breaking existing guests, we catch udp packets and add 1697 * checksums. This is terrible but it's better than hacking the guest 1698 * kernels. 1699 * 1700 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1701 * we should provide a mechanism to disable it to avoid polluting the host 1702 * cache. 1703 */ 1704 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1705 size_t *hdr_len, const uint8_t *buf, 1706 size_t buf_size, size_t *buf_offset) 1707 { 1708 size_t csum_size = ETH_HLEN + sizeof(struct ip_header) + 1709 sizeof(struct udp_header); 1710 1711 buf += *buf_offset; 1712 buf_size -= *buf_offset; 1713 1714 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1715 (buf_size >= csum_size && buf_size < 1500) && /* normal sized MTU */ 1716 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1717 (buf[23] == 17) && /* ip.protocol == UDP */ 1718 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1719 memcpy((uint8_t *)hdr + *hdr_len, buf, csum_size); 1720 net_checksum_calculate((uint8_t *)hdr + *hdr_len, csum_size, CSUM_UDP); 1721 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1722 *hdr_len += csum_size; 1723 *buf_offset += csum_size; 1724 } 1725 } 1726 1727 static size_t receive_header(VirtIONet *n, struct virtio_net_hdr *hdr, 1728 const void *buf, size_t buf_size, 1729 size_t *buf_offset) 1730 { 1731 size_t hdr_len = n->guest_hdr_len; 1732 1733 memcpy(hdr, buf, sizeof(struct virtio_net_hdr)); 1734 1735 *buf_offset = n->host_hdr_len; 1736 work_around_broken_dhclient(hdr, &hdr_len, buf, buf_size, buf_offset); 1737 1738 if (n->needs_vnet_hdr_swap) { 1739 virtio_net_hdr_swap(VIRTIO_DEVICE(n), hdr); 1740 } 1741 1742 return hdr_len; 1743 } 1744 1745 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1746 { 1747 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1748 static const uint8_t vlan[] = {0x81, 0x00}; 1749 uint8_t *ptr = (uint8_t *)buf; 1750 int i; 1751 1752 if (n->promisc) 1753 return 1; 1754 1755 ptr += n->host_hdr_len; 1756 1757 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1758 int vid = lduw_be_p(ptr + 14) & 0xfff; 1759 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1760 return 0; 1761 } 1762 1763 if (ptr[0] & 1) { // multicast 1764 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1765 return !n->nobcast; 1766 } else if (n->nomulti) { 1767 return 0; 1768 } else if (n->allmulti || n->mac_table.multi_overflow) { 1769 return 1; 1770 } 1771 1772 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1773 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1774 return 1; 1775 } 1776 } 1777 } else { // unicast 1778 if (n->nouni) { 1779 return 0; 1780 } else if (n->alluni || n->mac_table.uni_overflow) { 1781 return 1; 1782 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1783 return 1; 1784 } 1785 1786 for (i = 0; i < n->mac_table.first_multi; i++) { 1787 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1788 return 1; 1789 } 1790 } 1791 } 1792 1793 return 0; 1794 } 1795 1796 static uint8_t virtio_net_get_hash_type(bool hasip4, 1797 bool hasip6, 1798 EthL4HdrProto l4hdr_proto, 1799 uint32_t types) 1800 { 1801 if (hasip4) { 1802 switch (l4hdr_proto) { 1803 case ETH_L4_HDR_PROTO_TCP: 1804 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 1805 return NetPktRssIpV4Tcp; 1806 } 1807 break; 1808 1809 case ETH_L4_HDR_PROTO_UDP: 1810 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 1811 return NetPktRssIpV4Udp; 1812 } 1813 break; 1814 1815 default: 1816 break; 1817 } 1818 1819 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 1820 return NetPktRssIpV4; 1821 } 1822 } else if (hasip6) { 1823 switch (l4hdr_proto) { 1824 case ETH_L4_HDR_PROTO_TCP: 1825 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) { 1826 return NetPktRssIpV6TcpEx; 1827 } 1828 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 1829 return NetPktRssIpV6Tcp; 1830 } 1831 break; 1832 1833 case ETH_L4_HDR_PROTO_UDP: 1834 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) { 1835 return NetPktRssIpV6UdpEx; 1836 } 1837 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 1838 return NetPktRssIpV6Udp; 1839 } 1840 break; 1841 1842 default: 1843 break; 1844 } 1845 1846 if (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) { 1847 return NetPktRssIpV6Ex; 1848 } 1849 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 1850 return NetPktRssIpV6; 1851 } 1852 } 1853 return 0xff; 1854 } 1855 1856 static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf, 1857 size_t size, 1858 struct virtio_net_hdr_v1_hash *hdr) 1859 { 1860 VirtIONet *n = qemu_get_nic_opaque(nc); 1861 unsigned int index = nc->queue_index, new_index = index; 1862 struct NetRxPkt *pkt = n->rx_pkt; 1863 uint8_t net_hash_type; 1864 uint32_t hash; 1865 bool hasip4, hasip6; 1866 EthL4HdrProto l4hdr_proto; 1867 static const uint8_t reports[NetPktRssIpV6UdpEx + 1] = { 1868 VIRTIO_NET_HASH_REPORT_IPv4, 1869 VIRTIO_NET_HASH_REPORT_TCPv4, 1870 VIRTIO_NET_HASH_REPORT_TCPv6, 1871 VIRTIO_NET_HASH_REPORT_IPv6, 1872 VIRTIO_NET_HASH_REPORT_IPv6_EX, 1873 VIRTIO_NET_HASH_REPORT_TCPv6_EX, 1874 VIRTIO_NET_HASH_REPORT_UDPv4, 1875 VIRTIO_NET_HASH_REPORT_UDPv6, 1876 VIRTIO_NET_HASH_REPORT_UDPv6_EX 1877 }; 1878 struct iovec iov = { 1879 .iov_base = (void *)buf, 1880 .iov_len = size 1881 }; 1882 1883 net_rx_pkt_set_protocols(pkt, &iov, 1, n->host_hdr_len); 1884 net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto); 1885 net_hash_type = virtio_net_get_hash_type(hasip4, hasip6, l4hdr_proto, 1886 n->rss_data.hash_types); 1887 if (net_hash_type > NetPktRssIpV6UdpEx) { 1888 if (n->rss_data.populate_hash) { 1889 hdr->hash_value = VIRTIO_NET_HASH_REPORT_NONE; 1890 hdr->hash_report = 0; 1891 } 1892 return n->rss_data.redirect ? n->rss_data.default_queue : -1; 1893 } 1894 1895 hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key); 1896 1897 if (n->rss_data.populate_hash) { 1898 hdr->hash_value = hash; 1899 hdr->hash_report = reports[net_hash_type]; 1900 } 1901 1902 if (n->rss_data.redirect) { 1903 new_index = hash & (n->rss_data.indirections_len - 1); 1904 new_index = n->rss_data.indirections_table[new_index]; 1905 } 1906 1907 return (index == new_index) ? -1 : new_index; 1908 } 1909 1910 typedef struct Header { 1911 struct virtio_net_hdr_v1_hash virtio_net; 1912 struct eth_header eth; 1913 struct ip_header ip; 1914 struct udp_header udp; 1915 } Header; 1916 1917 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1918 size_t size) 1919 { 1920 VirtIONet *n = qemu_get_nic_opaque(nc); 1921 VirtIONetQueue *q; 1922 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1923 VirtQueueElement *elems[VIRTQUEUE_MAX_SIZE]; 1924 size_t lens[VIRTQUEUE_MAX_SIZE]; 1925 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1926 Header hdr; 1927 unsigned mhdr_cnt = 0; 1928 size_t offset, i, guest_offset, j; 1929 ssize_t err; 1930 1931 memset(&hdr.virtio_net, 0, sizeof(hdr.virtio_net)); 1932 1933 if (n->rss_data.enabled && n->rss_data.enabled_software_rss) { 1934 int index = virtio_net_process_rss(nc, buf, size, &hdr.virtio_net); 1935 if (index >= 0) { 1936 nc = qemu_get_subqueue(n->nic, index % n->curr_queue_pairs); 1937 } 1938 } 1939 1940 if (!virtio_net_can_receive(nc)) { 1941 return -1; 1942 } 1943 1944 q = virtio_net_get_subqueue(nc); 1945 1946 /* hdr_len refers to the header we supply to the guest */ 1947 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1948 return 0; 1949 } 1950 1951 if (!receive_filter(n, buf, size)) 1952 return size; 1953 1954 offset = i = 0; 1955 1956 while (offset < size) { 1957 VirtQueueElement *elem; 1958 int len, total; 1959 const struct iovec *sg; 1960 1961 total = 0; 1962 1963 if (i == VIRTQUEUE_MAX_SIZE) { 1964 virtio_error(vdev, "virtio-net unexpected long buffer chain"); 1965 err = size; 1966 goto err; 1967 } 1968 1969 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1970 if (!elem) { 1971 if (i) { 1972 virtio_error(vdev, "virtio-net unexpected empty queue: " 1973 "i %zd mergeable %d offset %zd, size %zd, " 1974 "guest hdr len %zd, host hdr len %zd " 1975 "guest features 0x%" PRIx64, 1976 i, n->mergeable_rx_bufs, offset, size, 1977 n->guest_hdr_len, n->host_hdr_len, 1978 vdev->guest_features); 1979 } 1980 err = -1; 1981 goto err; 1982 } 1983 1984 if (elem->in_num < 1) { 1985 virtio_error(vdev, 1986 "virtio-net receive queue contains no in buffers"); 1987 virtqueue_detach_element(q->rx_vq, elem, 0); 1988 g_free(elem); 1989 err = -1; 1990 goto err; 1991 } 1992 1993 sg = elem->in_sg; 1994 if (i == 0) { 1995 assert(offset == 0); 1996 if (n->mergeable_rx_bufs) { 1997 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1998 sg, elem->in_num, 1999 offsetof(typeof(hdr), 2000 virtio_net.hdr.num_buffers), 2001 sizeof(hdr.virtio_net.hdr.num_buffers)); 2002 } 2003 2004 guest_offset = n->has_vnet_hdr ? 2005 receive_header(n, (struct virtio_net_hdr *)&hdr, 2006 buf, size, &offset) : 2007 n->guest_hdr_len; 2008 2009 iov_from_buf(sg, elem->in_num, 0, &hdr, guest_offset); 2010 total += guest_offset; 2011 } else { 2012 guest_offset = 0; 2013 } 2014 2015 /* copy in packet. ugh */ 2016 len = iov_from_buf(sg, elem->in_num, guest_offset, 2017 buf + offset, size - offset); 2018 total += len; 2019 offset += len; 2020 /* If buffers can't be merged, at this point we 2021 * must have consumed the complete packet. 2022 * Otherwise, drop it. */ 2023 if (!n->mergeable_rx_bufs && offset < size) { 2024 virtqueue_unpop(q->rx_vq, elem, total); 2025 g_free(elem); 2026 err = size; 2027 goto err; 2028 } 2029 2030 elems[i] = elem; 2031 lens[i] = total; 2032 i++; 2033 } 2034 2035 if (mhdr_cnt) { 2036 virtio_stw_p(vdev, &hdr.virtio_net.hdr.num_buffers, i); 2037 iov_from_buf(mhdr_sg, mhdr_cnt, 2038 0, 2039 &hdr.virtio_net.hdr.num_buffers, 2040 sizeof hdr.virtio_net.hdr.num_buffers); 2041 } 2042 2043 for (j = 0; j < i; j++) { 2044 /* signal other side */ 2045 virtqueue_fill(q->rx_vq, elems[j], lens[j], j); 2046 g_free(elems[j]); 2047 } 2048 2049 virtqueue_flush(q->rx_vq, i); 2050 virtio_notify(vdev, q->rx_vq); 2051 2052 return size; 2053 2054 err: 2055 for (j = 0; j < i; j++) { 2056 virtqueue_detach_element(q->rx_vq, elems[j], lens[j]); 2057 g_free(elems[j]); 2058 } 2059 2060 return err; 2061 } 2062 2063 static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf, 2064 size_t size) 2065 { 2066 RCU_READ_LOCK_GUARD(); 2067 2068 return virtio_net_receive_rcu(nc, buf, size); 2069 } 2070 2071 /* 2072 * Accessors to read and write the IP packet data length field. This 2073 * is a potentially unaligned network-byte-order 16 bit unsigned integer 2074 * pointed to by unit->ip_len. 2075 */ 2076 static uint16_t read_unit_ip_len(VirtioNetRscUnit *unit) 2077 { 2078 return lduw_be_p(unit->ip_plen); 2079 } 2080 2081 static void write_unit_ip_len(VirtioNetRscUnit *unit, uint16_t l) 2082 { 2083 stw_be_p(unit->ip_plen, l); 2084 } 2085 2086 static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain, 2087 const uint8_t *buf, 2088 VirtioNetRscUnit *unit) 2089 { 2090 uint16_t ip_hdrlen; 2091 struct ip_header *ip; 2092 2093 ip = (struct ip_header *)(buf + chain->n->guest_hdr_len 2094 + sizeof(struct eth_header)); 2095 unit->ip = (void *)ip; 2096 ip_hdrlen = (ip->ip_ver_len & 0xF) << 2; 2097 unit->ip_plen = &ip->ip_len; 2098 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen); 2099 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 2100 unit->payload = read_unit_ip_len(unit) - ip_hdrlen - unit->tcp_hdrlen; 2101 } 2102 2103 static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain, 2104 const uint8_t *buf, 2105 VirtioNetRscUnit *unit) 2106 { 2107 struct ip6_header *ip6; 2108 2109 ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len 2110 + sizeof(struct eth_header)); 2111 unit->ip = ip6; 2112 unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 2113 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) 2114 + sizeof(struct ip6_header)); 2115 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 2116 2117 /* There is a difference between payload length in ipv4 and v6, 2118 ip header is excluded in ipv6 */ 2119 unit->payload = read_unit_ip_len(unit) - unit->tcp_hdrlen; 2120 } 2121 2122 static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain, 2123 VirtioNetRscSeg *seg) 2124 { 2125 int ret; 2126 struct virtio_net_hdr_v1 *h; 2127 2128 h = (struct virtio_net_hdr_v1 *)seg->buf; 2129 h->flags = 0; 2130 h->gso_type = VIRTIO_NET_HDR_GSO_NONE; 2131 2132 if (seg->is_coalesced) { 2133 h->rsc.segments = seg->packets; 2134 h->rsc.dup_acks = seg->dup_ack; 2135 h->flags = VIRTIO_NET_HDR_F_RSC_INFO; 2136 if (chain->proto == ETH_P_IP) { 2137 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 2138 } else { 2139 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 2140 } 2141 } 2142 2143 ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size); 2144 QTAILQ_REMOVE(&chain->buffers, seg, next); 2145 g_free(seg->buf); 2146 g_free(seg); 2147 2148 return ret; 2149 } 2150 2151 static void virtio_net_rsc_purge(void *opq) 2152 { 2153 VirtioNetRscSeg *seg, *rn; 2154 VirtioNetRscChain *chain = (VirtioNetRscChain *)opq; 2155 2156 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) { 2157 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2158 chain->stat.purge_failed++; 2159 continue; 2160 } 2161 } 2162 2163 chain->stat.timer++; 2164 if (!QTAILQ_EMPTY(&chain->buffers)) { 2165 timer_mod(chain->drain_timer, 2166 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + chain->n->rsc_timeout); 2167 } 2168 } 2169 2170 static void virtio_net_rsc_cleanup(VirtIONet *n) 2171 { 2172 VirtioNetRscChain *chain, *rn_chain; 2173 VirtioNetRscSeg *seg, *rn_seg; 2174 2175 QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) { 2176 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) { 2177 QTAILQ_REMOVE(&chain->buffers, seg, next); 2178 g_free(seg->buf); 2179 g_free(seg); 2180 } 2181 2182 timer_free(chain->drain_timer); 2183 QTAILQ_REMOVE(&n->rsc_chains, chain, next); 2184 g_free(chain); 2185 } 2186 } 2187 2188 static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain, 2189 NetClientState *nc, 2190 const uint8_t *buf, size_t size) 2191 { 2192 uint16_t hdr_len; 2193 VirtioNetRscSeg *seg; 2194 2195 hdr_len = chain->n->guest_hdr_len; 2196 seg = g_new(VirtioNetRscSeg, 1); 2197 seg->buf = g_malloc(hdr_len + sizeof(struct eth_header) 2198 + sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD); 2199 memcpy(seg->buf, buf, size); 2200 seg->size = size; 2201 seg->packets = 1; 2202 seg->dup_ack = 0; 2203 seg->is_coalesced = 0; 2204 seg->nc = nc; 2205 2206 QTAILQ_INSERT_TAIL(&chain->buffers, seg, next); 2207 chain->stat.cache++; 2208 2209 switch (chain->proto) { 2210 case ETH_P_IP: 2211 virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit); 2212 break; 2213 case ETH_P_IPV6: 2214 virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit); 2215 break; 2216 default: 2217 g_assert_not_reached(); 2218 } 2219 } 2220 2221 static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain, 2222 VirtioNetRscSeg *seg, 2223 const uint8_t *buf, 2224 struct tcp_header *n_tcp, 2225 struct tcp_header *o_tcp) 2226 { 2227 uint32_t nack, oack; 2228 uint16_t nwin, owin; 2229 2230 nack = htonl(n_tcp->th_ack); 2231 nwin = htons(n_tcp->th_win); 2232 oack = htonl(o_tcp->th_ack); 2233 owin = htons(o_tcp->th_win); 2234 2235 if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) { 2236 chain->stat.ack_out_of_win++; 2237 return RSC_FINAL; 2238 } else if (nack == oack) { 2239 /* duplicated ack or window probe */ 2240 if (nwin == owin) { 2241 /* duplicated ack, add dup ack count due to whql test up to 1 */ 2242 chain->stat.dup_ack++; 2243 return RSC_FINAL; 2244 } else { 2245 /* Coalesce window update */ 2246 o_tcp->th_win = n_tcp->th_win; 2247 chain->stat.win_update++; 2248 return RSC_COALESCE; 2249 } 2250 } else { 2251 /* pure ack, go to 'C', finalize*/ 2252 chain->stat.pure_ack++; 2253 return RSC_FINAL; 2254 } 2255 } 2256 2257 static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain, 2258 VirtioNetRscSeg *seg, 2259 const uint8_t *buf, 2260 VirtioNetRscUnit *n_unit) 2261 { 2262 void *data; 2263 uint16_t o_ip_len; 2264 uint32_t nseq, oseq; 2265 VirtioNetRscUnit *o_unit; 2266 2267 o_unit = &seg->unit; 2268 o_ip_len = read_unit_ip_len(o_unit); 2269 nseq = htonl(n_unit->tcp->th_seq); 2270 oseq = htonl(o_unit->tcp->th_seq); 2271 2272 /* out of order or retransmitted. */ 2273 if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) { 2274 chain->stat.data_out_of_win++; 2275 return RSC_FINAL; 2276 } 2277 2278 data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen; 2279 if (nseq == oseq) { 2280 if ((o_unit->payload == 0) && n_unit->payload) { 2281 /* From no payload to payload, normal case, not a dup ack or etc */ 2282 chain->stat.data_after_pure_ack++; 2283 goto coalesce; 2284 } else { 2285 return virtio_net_rsc_handle_ack(chain, seg, buf, 2286 n_unit->tcp, o_unit->tcp); 2287 } 2288 } else if ((nseq - oseq) != o_unit->payload) { 2289 /* Not a consistent packet, out of order */ 2290 chain->stat.data_out_of_order++; 2291 return RSC_FINAL; 2292 } else { 2293 coalesce: 2294 if ((o_ip_len + n_unit->payload) > chain->max_payload) { 2295 chain->stat.over_size++; 2296 return RSC_FINAL; 2297 } 2298 2299 /* Here comes the right data, the payload length in v4/v6 is different, 2300 so use the field value to update and record the new data len */ 2301 o_unit->payload += n_unit->payload; /* update new data len */ 2302 2303 /* update field in ip header */ 2304 write_unit_ip_len(o_unit, o_ip_len + n_unit->payload); 2305 2306 /* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced 2307 for windows guest, while this may change the behavior for linux 2308 guest (only if it uses RSC feature). */ 2309 o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags; 2310 2311 o_unit->tcp->th_ack = n_unit->tcp->th_ack; 2312 o_unit->tcp->th_win = n_unit->tcp->th_win; 2313 2314 memmove(seg->buf + seg->size, data, n_unit->payload); 2315 seg->size += n_unit->payload; 2316 seg->packets++; 2317 chain->stat.coalesced++; 2318 return RSC_COALESCE; 2319 } 2320 } 2321 2322 static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain, 2323 VirtioNetRscSeg *seg, 2324 const uint8_t *buf, size_t size, 2325 VirtioNetRscUnit *unit) 2326 { 2327 struct ip_header *ip1, *ip2; 2328 2329 ip1 = (struct ip_header *)(unit->ip); 2330 ip2 = (struct ip_header *)(seg->unit.ip); 2331 if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst) 2332 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 2333 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 2334 chain->stat.no_match++; 2335 return RSC_NO_MATCH; 2336 } 2337 2338 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 2339 } 2340 2341 static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain, 2342 VirtioNetRscSeg *seg, 2343 const uint8_t *buf, size_t size, 2344 VirtioNetRscUnit *unit) 2345 { 2346 struct ip6_header *ip1, *ip2; 2347 2348 ip1 = (struct ip6_header *)(unit->ip); 2349 ip2 = (struct ip6_header *)(seg->unit.ip); 2350 if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address)) 2351 || memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address)) 2352 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 2353 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 2354 chain->stat.no_match++; 2355 return RSC_NO_MATCH; 2356 } 2357 2358 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 2359 } 2360 2361 /* Packets with 'SYN' should bypass, other flag should be sent after drain 2362 * to prevent out of order */ 2363 static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain, 2364 struct tcp_header *tcp) 2365 { 2366 uint16_t tcp_hdr; 2367 uint16_t tcp_flag; 2368 2369 tcp_flag = htons(tcp->th_offset_flags); 2370 tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10; 2371 tcp_flag &= VIRTIO_NET_TCP_FLAG; 2372 if (tcp_flag & TH_SYN) { 2373 chain->stat.tcp_syn++; 2374 return RSC_BYPASS; 2375 } 2376 2377 if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) { 2378 chain->stat.tcp_ctrl_drain++; 2379 return RSC_FINAL; 2380 } 2381 2382 if (tcp_hdr > sizeof(struct tcp_header)) { 2383 chain->stat.tcp_all_opt++; 2384 return RSC_FINAL; 2385 } 2386 2387 return RSC_CANDIDATE; 2388 } 2389 2390 static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain, 2391 NetClientState *nc, 2392 const uint8_t *buf, size_t size, 2393 VirtioNetRscUnit *unit) 2394 { 2395 int ret; 2396 VirtioNetRscSeg *seg, *nseg; 2397 2398 if (QTAILQ_EMPTY(&chain->buffers)) { 2399 chain->stat.empty_cache++; 2400 virtio_net_rsc_cache_buf(chain, nc, buf, size); 2401 timer_mod(chain->drain_timer, 2402 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + chain->n->rsc_timeout); 2403 return size; 2404 } 2405 2406 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 2407 if (chain->proto == ETH_P_IP) { 2408 ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit); 2409 } else { 2410 ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit); 2411 } 2412 2413 if (ret == RSC_FINAL) { 2414 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2415 /* Send failed */ 2416 chain->stat.final_failed++; 2417 return 0; 2418 } 2419 2420 /* Send current packet */ 2421 return virtio_net_do_receive(nc, buf, size); 2422 } else if (ret == RSC_NO_MATCH) { 2423 continue; 2424 } else { 2425 /* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */ 2426 seg->is_coalesced = 1; 2427 return size; 2428 } 2429 } 2430 2431 chain->stat.no_match_cache++; 2432 virtio_net_rsc_cache_buf(chain, nc, buf, size); 2433 return size; 2434 } 2435 2436 /* Drain a connection data, this is to avoid out of order segments */ 2437 static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain, 2438 NetClientState *nc, 2439 const uint8_t *buf, size_t size, 2440 uint16_t ip_start, uint16_t ip_size, 2441 uint16_t tcp_port) 2442 { 2443 VirtioNetRscSeg *seg, *nseg; 2444 uint32_t ppair1, ppair2; 2445 2446 ppair1 = *(uint32_t *)(buf + tcp_port); 2447 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 2448 ppair2 = *(uint32_t *)(seg->buf + tcp_port); 2449 if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size) 2450 || (ppair1 != ppair2)) { 2451 continue; 2452 } 2453 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2454 chain->stat.drain_failed++; 2455 } 2456 2457 break; 2458 } 2459 2460 return virtio_net_do_receive(nc, buf, size); 2461 } 2462 2463 static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain, 2464 struct ip_header *ip, 2465 const uint8_t *buf, size_t size) 2466 { 2467 uint16_t ip_len; 2468 2469 /* Not an ipv4 packet */ 2470 if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) { 2471 chain->stat.ip_option++; 2472 return RSC_BYPASS; 2473 } 2474 2475 /* Don't handle packets with ip option */ 2476 if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) { 2477 chain->stat.ip_option++; 2478 return RSC_BYPASS; 2479 } 2480 2481 if (ip->ip_p != IPPROTO_TCP) { 2482 chain->stat.bypass_not_tcp++; 2483 return RSC_BYPASS; 2484 } 2485 2486 /* Don't handle packets with ip fragment */ 2487 if (!(htons(ip->ip_off) & IP_DF)) { 2488 chain->stat.ip_frag++; 2489 return RSC_BYPASS; 2490 } 2491 2492 /* Don't handle packets with ecn flag */ 2493 if (IPTOS_ECN(ip->ip_tos)) { 2494 chain->stat.ip_ecn++; 2495 return RSC_BYPASS; 2496 } 2497 2498 ip_len = htons(ip->ip_len); 2499 if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header)) 2500 || ip_len > (size - chain->n->guest_hdr_len - 2501 sizeof(struct eth_header))) { 2502 chain->stat.ip_hacked++; 2503 return RSC_BYPASS; 2504 } 2505 2506 return RSC_CANDIDATE; 2507 } 2508 2509 static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain, 2510 NetClientState *nc, 2511 const uint8_t *buf, size_t size) 2512 { 2513 int32_t ret; 2514 uint16_t hdr_len; 2515 VirtioNetRscUnit unit; 2516 2517 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 2518 2519 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header) 2520 + sizeof(struct tcp_header))) { 2521 chain->stat.bypass_not_tcp++; 2522 return virtio_net_do_receive(nc, buf, size); 2523 } 2524 2525 virtio_net_rsc_extract_unit4(chain, buf, &unit); 2526 if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size) 2527 != RSC_CANDIDATE) { 2528 return virtio_net_do_receive(nc, buf, size); 2529 } 2530 2531 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 2532 if (ret == RSC_BYPASS) { 2533 return virtio_net_do_receive(nc, buf, size); 2534 } else if (ret == RSC_FINAL) { 2535 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 2536 ((hdr_len + sizeof(struct eth_header)) + 12), 2537 VIRTIO_NET_IP4_ADDR_SIZE, 2538 hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)); 2539 } 2540 2541 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 2542 } 2543 2544 static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain, 2545 struct ip6_header *ip6, 2546 const uint8_t *buf, size_t size) 2547 { 2548 uint16_t ip_len; 2549 2550 if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4) 2551 != IP_HEADER_VERSION_6) { 2552 return RSC_BYPASS; 2553 } 2554 2555 /* Both option and protocol is checked in this */ 2556 if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) { 2557 chain->stat.bypass_not_tcp++; 2558 return RSC_BYPASS; 2559 } 2560 2561 ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 2562 if (ip_len < sizeof(struct tcp_header) || 2563 ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header) 2564 - sizeof(struct ip6_header))) { 2565 chain->stat.ip_hacked++; 2566 return RSC_BYPASS; 2567 } 2568 2569 /* Don't handle packets with ecn flag */ 2570 if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) { 2571 chain->stat.ip_ecn++; 2572 return RSC_BYPASS; 2573 } 2574 2575 return RSC_CANDIDATE; 2576 } 2577 2578 static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc, 2579 const uint8_t *buf, size_t size) 2580 { 2581 int32_t ret; 2582 uint16_t hdr_len; 2583 VirtioNetRscChain *chain; 2584 VirtioNetRscUnit unit; 2585 2586 chain = opq; 2587 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 2588 2589 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header) 2590 + sizeof(tcp_header))) { 2591 return virtio_net_do_receive(nc, buf, size); 2592 } 2593 2594 virtio_net_rsc_extract_unit6(chain, buf, &unit); 2595 if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain, 2596 unit.ip, buf, size)) { 2597 return virtio_net_do_receive(nc, buf, size); 2598 } 2599 2600 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 2601 if (ret == RSC_BYPASS) { 2602 return virtio_net_do_receive(nc, buf, size); 2603 } else if (ret == RSC_FINAL) { 2604 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 2605 ((hdr_len + sizeof(struct eth_header)) + 8), 2606 VIRTIO_NET_IP6_ADDR_SIZE, 2607 hdr_len + sizeof(struct eth_header) 2608 + sizeof(struct ip6_header)); 2609 } 2610 2611 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 2612 } 2613 2614 static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n, 2615 NetClientState *nc, 2616 uint16_t proto) 2617 { 2618 VirtioNetRscChain *chain; 2619 2620 if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) { 2621 return NULL; 2622 } 2623 2624 QTAILQ_FOREACH(chain, &n->rsc_chains, next) { 2625 if (chain->proto == proto) { 2626 return chain; 2627 } 2628 } 2629 2630 chain = g_malloc(sizeof(*chain)); 2631 chain->n = n; 2632 chain->proto = proto; 2633 if (proto == (uint16_t)ETH_P_IP) { 2634 chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD; 2635 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 2636 } else { 2637 chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD; 2638 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 2639 } 2640 chain->drain_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 2641 virtio_net_rsc_purge, chain); 2642 memset(&chain->stat, 0, sizeof(chain->stat)); 2643 2644 QTAILQ_INIT(&chain->buffers); 2645 QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next); 2646 2647 return chain; 2648 } 2649 2650 static ssize_t virtio_net_rsc_receive(NetClientState *nc, 2651 const uint8_t *buf, 2652 size_t size) 2653 { 2654 uint16_t proto; 2655 VirtioNetRscChain *chain; 2656 struct eth_header *eth; 2657 VirtIONet *n; 2658 2659 n = qemu_get_nic_opaque(nc); 2660 if (size < (n->host_hdr_len + sizeof(struct eth_header))) { 2661 return virtio_net_do_receive(nc, buf, size); 2662 } 2663 2664 eth = (struct eth_header *)(buf + n->guest_hdr_len); 2665 proto = htons(eth->h_proto); 2666 2667 chain = virtio_net_rsc_lookup_chain(n, nc, proto); 2668 if (chain) { 2669 chain->stat.received++; 2670 if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) { 2671 return virtio_net_rsc_receive4(chain, nc, buf, size); 2672 } else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) { 2673 return virtio_net_rsc_receive6(chain, nc, buf, size); 2674 } 2675 } 2676 return virtio_net_do_receive(nc, buf, size); 2677 } 2678 2679 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 2680 size_t size) 2681 { 2682 VirtIONet *n = qemu_get_nic_opaque(nc); 2683 if ((n->rsc4_enabled || n->rsc6_enabled)) { 2684 return virtio_net_rsc_receive(nc, buf, size); 2685 } else { 2686 return virtio_net_do_receive(nc, buf, size); 2687 } 2688 } 2689 2690 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 2691 2692 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 2693 { 2694 VirtIONet *n = qemu_get_nic_opaque(nc); 2695 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 2696 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2697 int ret; 2698 2699 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 2700 virtio_notify(vdev, q->tx_vq); 2701 2702 g_free(q->async_tx.elem); 2703 q->async_tx.elem = NULL; 2704 2705 virtio_queue_set_notification(q->tx_vq, 1); 2706 ret = virtio_net_flush_tx(q); 2707 if (ret >= n->tx_burst) { 2708 /* 2709 * the flush has been stopped by tx_burst 2710 * we will not receive notification for the 2711 * remainining part, so re-schedule 2712 */ 2713 virtio_queue_set_notification(q->tx_vq, 0); 2714 if (q->tx_bh) { 2715 replay_bh_schedule_event(q->tx_bh); 2716 } else { 2717 timer_mod(q->tx_timer, 2718 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2719 } 2720 q->tx_waiting = 1; 2721 } 2722 } 2723 2724 /* TX */ 2725 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 2726 { 2727 VirtIONet *n = q->n; 2728 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2729 VirtQueueElement *elem; 2730 int32_t num_packets = 0; 2731 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 2732 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2733 return num_packets; 2734 } 2735 2736 if (q->async_tx.elem) { 2737 virtio_queue_set_notification(q->tx_vq, 0); 2738 return num_packets; 2739 } 2740 2741 for (;;) { 2742 ssize_t ret; 2743 unsigned int out_num; 2744 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 2745 struct virtio_net_hdr vhdr; 2746 2747 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 2748 if (!elem) { 2749 break; 2750 } 2751 2752 out_num = elem->out_num; 2753 out_sg = elem->out_sg; 2754 if (out_num < 1) { 2755 virtio_error(vdev, "virtio-net header not in first element"); 2756 goto detach; 2757 } 2758 2759 if (n->needs_vnet_hdr_swap) { 2760 if (iov_to_buf(out_sg, out_num, 0, &vhdr, sizeof(vhdr)) < 2761 sizeof(vhdr)) { 2762 virtio_error(vdev, "virtio-net header incorrect"); 2763 goto detach; 2764 } 2765 virtio_net_hdr_swap(vdev, &vhdr); 2766 sg2[0].iov_base = &vhdr; 2767 sg2[0].iov_len = sizeof(vhdr); 2768 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, out_sg, out_num, 2769 sizeof(vhdr), -1); 2770 if (out_num == VIRTQUEUE_MAX_SIZE) { 2771 goto drop; 2772 } 2773 out_num += 1; 2774 out_sg = sg2; 2775 } 2776 /* 2777 * If host wants to see the guest header as is, we can 2778 * pass it on unchanged. Otherwise, copy just the parts 2779 * that host is interested in. 2780 */ 2781 assert(n->host_hdr_len <= n->guest_hdr_len); 2782 if (n->host_hdr_len != n->guest_hdr_len) { 2783 if (iov_size(out_sg, out_num) < n->guest_hdr_len) { 2784 virtio_error(vdev, "virtio-net header is invalid"); 2785 goto detach; 2786 } 2787 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 2788 out_sg, out_num, 2789 0, n->host_hdr_len); 2790 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 2791 out_sg, out_num, 2792 n->guest_hdr_len, -1); 2793 out_num = sg_num; 2794 out_sg = sg; 2795 2796 if (out_num < 1) { 2797 virtio_error(vdev, "virtio-net nothing to send"); 2798 goto detach; 2799 } 2800 } 2801 2802 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 2803 out_sg, out_num, virtio_net_tx_complete); 2804 if (ret == 0) { 2805 virtio_queue_set_notification(q->tx_vq, 0); 2806 q->async_tx.elem = elem; 2807 return -EBUSY; 2808 } 2809 2810 drop: 2811 virtqueue_push(q->tx_vq, elem, 0); 2812 virtio_notify(vdev, q->tx_vq); 2813 g_free(elem); 2814 2815 if (++num_packets >= n->tx_burst) { 2816 break; 2817 } 2818 } 2819 return num_packets; 2820 2821 detach: 2822 virtqueue_detach_element(q->tx_vq, elem, 0); 2823 g_free(elem); 2824 return -EINVAL; 2825 } 2826 2827 static void virtio_net_tx_timer(void *opaque); 2828 2829 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 2830 { 2831 VirtIONet *n = VIRTIO_NET(vdev); 2832 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2833 2834 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2835 virtio_net_drop_tx_queue_data(vdev, vq); 2836 return; 2837 } 2838 2839 /* This happens when device was stopped but VCPU wasn't. */ 2840 if (!vdev->vm_running) { 2841 q->tx_waiting = 1; 2842 return; 2843 } 2844 2845 if (q->tx_waiting) { 2846 /* We already have queued packets, immediately flush */ 2847 timer_del(q->tx_timer); 2848 virtio_net_tx_timer(q); 2849 } else { 2850 /* re-arm timer to flush it (and more) on next tick */ 2851 timer_mod(q->tx_timer, 2852 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2853 q->tx_waiting = 1; 2854 virtio_queue_set_notification(vq, 0); 2855 } 2856 } 2857 2858 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 2859 { 2860 VirtIONet *n = VIRTIO_NET(vdev); 2861 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2862 2863 if (unlikely(n->vhost_started)) { 2864 return; 2865 } 2866 2867 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2868 virtio_net_drop_tx_queue_data(vdev, vq); 2869 return; 2870 } 2871 2872 if (unlikely(q->tx_waiting)) { 2873 return; 2874 } 2875 q->tx_waiting = 1; 2876 /* This happens when device was stopped but VCPU wasn't. */ 2877 if (!vdev->vm_running) { 2878 return; 2879 } 2880 virtio_queue_set_notification(vq, 0); 2881 replay_bh_schedule_event(q->tx_bh); 2882 } 2883 2884 static void virtio_net_tx_timer(void *opaque) 2885 { 2886 VirtIONetQueue *q = opaque; 2887 VirtIONet *n = q->n; 2888 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2889 int ret; 2890 2891 /* This happens when device was stopped but BH wasn't. */ 2892 if (!vdev->vm_running) { 2893 /* Make sure tx waiting is set, so we'll run when restarted. */ 2894 assert(q->tx_waiting); 2895 return; 2896 } 2897 2898 q->tx_waiting = 0; 2899 2900 /* Just in case the driver is not ready on more */ 2901 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2902 return; 2903 } 2904 2905 ret = virtio_net_flush_tx(q); 2906 if (ret == -EBUSY || ret == -EINVAL) { 2907 return; 2908 } 2909 /* 2910 * If we flush a full burst of packets, assume there are 2911 * more coming and immediately rearm 2912 */ 2913 if (ret >= n->tx_burst) { 2914 q->tx_waiting = 1; 2915 timer_mod(q->tx_timer, 2916 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2917 return; 2918 } 2919 /* 2920 * If less than a full burst, re-enable notification and flush 2921 * anything that may have come in while we weren't looking. If 2922 * we find something, assume the guest is still active and rearm 2923 */ 2924 virtio_queue_set_notification(q->tx_vq, 1); 2925 ret = virtio_net_flush_tx(q); 2926 if (ret > 0) { 2927 virtio_queue_set_notification(q->tx_vq, 0); 2928 q->tx_waiting = 1; 2929 timer_mod(q->tx_timer, 2930 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2931 } 2932 } 2933 2934 static void virtio_net_tx_bh(void *opaque) 2935 { 2936 VirtIONetQueue *q = opaque; 2937 VirtIONet *n = q->n; 2938 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2939 int32_t ret; 2940 2941 /* This happens when device was stopped but BH wasn't. */ 2942 if (!vdev->vm_running) { 2943 /* Make sure tx waiting is set, so we'll run when restarted. */ 2944 assert(q->tx_waiting); 2945 return; 2946 } 2947 2948 q->tx_waiting = 0; 2949 2950 /* Just in case the driver is not ready on more */ 2951 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 2952 return; 2953 } 2954 2955 ret = virtio_net_flush_tx(q); 2956 if (ret == -EBUSY || ret == -EINVAL) { 2957 return; /* Notification re-enable handled by tx_complete or device 2958 * broken */ 2959 } 2960 2961 /* If we flush a full burst of packets, assume there are 2962 * more coming and immediately reschedule */ 2963 if (ret >= n->tx_burst) { 2964 replay_bh_schedule_event(q->tx_bh); 2965 q->tx_waiting = 1; 2966 return; 2967 } 2968 2969 /* If less than a full burst, re-enable notification and flush 2970 * anything that may have come in while we weren't looking. If 2971 * we find something, assume the guest is still active and reschedule */ 2972 virtio_queue_set_notification(q->tx_vq, 1); 2973 ret = virtio_net_flush_tx(q); 2974 if (ret == -EINVAL) { 2975 return; 2976 } else if (ret > 0) { 2977 virtio_queue_set_notification(q->tx_vq, 0); 2978 replay_bh_schedule_event(q->tx_bh); 2979 q->tx_waiting = 1; 2980 } 2981 } 2982 2983 static void virtio_net_add_queue(VirtIONet *n, int index) 2984 { 2985 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2986 2987 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 2988 virtio_net_handle_rx); 2989 2990 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 2991 n->vqs[index].tx_vq = 2992 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 2993 virtio_net_handle_tx_timer); 2994 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 2995 virtio_net_tx_timer, 2996 &n->vqs[index]); 2997 } else { 2998 n->vqs[index].tx_vq = 2999 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 3000 virtio_net_handle_tx_bh); 3001 n->vqs[index].tx_bh = qemu_bh_new_guarded(virtio_net_tx_bh, &n->vqs[index], 3002 &DEVICE(vdev)->mem_reentrancy_guard); 3003 } 3004 3005 n->vqs[index].tx_waiting = 0; 3006 n->vqs[index].n = n; 3007 } 3008 3009 static void virtio_net_del_queue(VirtIONet *n, int index) 3010 { 3011 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3012 VirtIONetQueue *q = &n->vqs[index]; 3013 NetClientState *nc = qemu_get_subqueue(n->nic, index); 3014 3015 qemu_purge_queued_packets(nc); 3016 3017 virtio_del_queue(vdev, index * 2); 3018 if (q->tx_timer) { 3019 timer_free(q->tx_timer); 3020 q->tx_timer = NULL; 3021 } else { 3022 qemu_bh_delete(q->tx_bh); 3023 q->tx_bh = NULL; 3024 } 3025 q->tx_waiting = 0; 3026 virtio_del_queue(vdev, index * 2 + 1); 3027 } 3028 3029 static void virtio_net_change_num_queue_pairs(VirtIONet *n, int new_max_queue_pairs) 3030 { 3031 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3032 int old_num_queues = virtio_get_num_queues(vdev); 3033 int new_num_queues = new_max_queue_pairs * 2 + 1; 3034 int i; 3035 3036 assert(old_num_queues >= 3); 3037 assert(old_num_queues % 2 == 1); 3038 3039 if (old_num_queues == new_num_queues) { 3040 return; 3041 } 3042 3043 /* 3044 * We always need to remove and add ctrl vq if 3045 * old_num_queues != new_num_queues. Remove ctrl_vq first, 3046 * and then we only enter one of the following two loops. 3047 */ 3048 virtio_del_queue(vdev, old_num_queues - 1); 3049 3050 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 3051 /* new_num_queues < old_num_queues */ 3052 virtio_net_del_queue(n, i / 2); 3053 } 3054 3055 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 3056 /* new_num_queues > old_num_queues */ 3057 virtio_net_add_queue(n, i / 2); 3058 } 3059 3060 /* add ctrl_vq last */ 3061 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 3062 } 3063 3064 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 3065 { 3066 int max = multiqueue ? n->max_queue_pairs : 1; 3067 3068 n->multiqueue = multiqueue; 3069 virtio_net_change_num_queue_pairs(n, max); 3070 3071 virtio_net_set_queue_pairs(n); 3072 } 3073 3074 static int virtio_net_pre_load_queues(VirtIODevice *vdev) 3075 { 3076 virtio_net_set_multiqueue(VIRTIO_NET(vdev), 3077 virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_RSS) || 3078 virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MQ)); 3079 3080 return 0; 3081 } 3082 3083 static int virtio_net_post_load_device(void *opaque, int version_id) 3084 { 3085 VirtIONet *n = opaque; 3086 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3087 int i, link_down; 3088 3089 trace_virtio_net_post_load_device(); 3090 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 3091 virtio_vdev_has_feature(vdev, 3092 VIRTIO_F_VERSION_1), 3093 virtio_vdev_has_feature(vdev, 3094 VIRTIO_NET_F_HASH_REPORT)); 3095 3096 /* MAC_TABLE_ENTRIES may be different from the saved image */ 3097 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 3098 n->mac_table.in_use = 0; 3099 } 3100 3101 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 3102 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 3103 } 3104 3105 /* 3106 * curr_guest_offloads will be later overwritten by the 3107 * virtio_set_features_nocheck call done from the virtio_load. 3108 * Here we make sure it is preserved and restored accordingly 3109 * in the virtio_net_post_load_virtio callback. 3110 */ 3111 n->saved_guest_offloads = n->curr_guest_offloads; 3112 3113 virtio_net_set_queue_pairs(n); 3114 3115 /* Find the first multicast entry in the saved MAC filter */ 3116 for (i = 0; i < n->mac_table.in_use; i++) { 3117 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 3118 break; 3119 } 3120 } 3121 n->mac_table.first_multi = i; 3122 3123 /* nc.link_down can't be migrated, so infer link_down according 3124 * to link status bit in n->status */ 3125 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 3126 for (i = 0; i < n->max_queue_pairs; i++) { 3127 qemu_get_subqueue(n->nic, i)->link_down = link_down; 3128 } 3129 3130 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 3131 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3132 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 3133 QEMU_CLOCK_VIRTUAL, 3134 virtio_net_announce_timer, n); 3135 if (n->announce_timer.round) { 3136 timer_mod(n->announce_timer.tm, 3137 qemu_clock_get_ms(n->announce_timer.type)); 3138 } else { 3139 qemu_announce_timer_del(&n->announce_timer, false); 3140 } 3141 } 3142 3143 virtio_net_commit_rss_config(n); 3144 return 0; 3145 } 3146 3147 static int virtio_net_post_load_virtio(VirtIODevice *vdev) 3148 { 3149 VirtIONet *n = VIRTIO_NET(vdev); 3150 /* 3151 * The actual needed state is now in saved_guest_offloads, 3152 * see virtio_net_post_load_device for detail. 3153 * Restore it back and apply the desired offloads. 3154 */ 3155 n->curr_guest_offloads = n->saved_guest_offloads; 3156 if (peer_has_vnet_hdr(n)) { 3157 virtio_net_apply_guest_offloads(n); 3158 } 3159 3160 return 0; 3161 } 3162 3163 /* tx_waiting field of a VirtIONetQueue */ 3164 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 3165 .name = "virtio-net-queue-tx_waiting", 3166 .fields = (const VMStateField[]) { 3167 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 3168 VMSTATE_END_OF_LIST() 3169 }, 3170 }; 3171 3172 static bool max_queue_pairs_gt_1(void *opaque, int version_id) 3173 { 3174 return VIRTIO_NET(opaque)->max_queue_pairs > 1; 3175 } 3176 3177 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 3178 { 3179 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 3180 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3181 } 3182 3183 static bool mac_table_fits(void *opaque, int version_id) 3184 { 3185 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 3186 } 3187 3188 static bool mac_table_doesnt_fit(void *opaque, int version_id) 3189 { 3190 return !mac_table_fits(opaque, version_id); 3191 } 3192 3193 /* This temporary type is shared by all the WITH_TMP methods 3194 * although only some fields are used by each. 3195 */ 3196 struct VirtIONetMigTmp { 3197 VirtIONet *parent; 3198 VirtIONetQueue *vqs_1; 3199 uint16_t curr_queue_pairs_1; 3200 uint8_t has_ufo; 3201 uint32_t has_vnet_hdr; 3202 }; 3203 3204 /* The 2nd and subsequent tx_waiting flags are loaded later than 3205 * the 1st entry in the queue_pairs and only if there's more than one 3206 * entry. We use the tmp mechanism to calculate a temporary 3207 * pointer and count and also validate the count. 3208 */ 3209 3210 static int virtio_net_tx_waiting_pre_save(void *opaque) 3211 { 3212 struct VirtIONetMigTmp *tmp = opaque; 3213 3214 tmp->vqs_1 = tmp->parent->vqs + 1; 3215 tmp->curr_queue_pairs_1 = tmp->parent->curr_queue_pairs - 1; 3216 if (tmp->parent->curr_queue_pairs == 0) { 3217 tmp->curr_queue_pairs_1 = 0; 3218 } 3219 3220 return 0; 3221 } 3222 3223 static int virtio_net_tx_waiting_pre_load(void *opaque) 3224 { 3225 struct VirtIONetMigTmp *tmp = opaque; 3226 3227 /* Reuse the pointer setup from save */ 3228 virtio_net_tx_waiting_pre_save(opaque); 3229 3230 if (tmp->parent->curr_queue_pairs > tmp->parent->max_queue_pairs) { 3231 error_report("virtio-net: curr_queue_pairs %x > max_queue_pairs %x", 3232 tmp->parent->curr_queue_pairs, tmp->parent->max_queue_pairs); 3233 3234 return -EINVAL; 3235 } 3236 3237 return 0; /* all good */ 3238 } 3239 3240 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 3241 .name = "virtio-net-tx_waiting", 3242 .pre_load = virtio_net_tx_waiting_pre_load, 3243 .pre_save = virtio_net_tx_waiting_pre_save, 3244 .fields = (const VMStateField[]) { 3245 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 3246 curr_queue_pairs_1, 3247 vmstate_virtio_net_queue_tx_waiting, 3248 struct VirtIONetQueue), 3249 VMSTATE_END_OF_LIST() 3250 }, 3251 }; 3252 3253 /* the 'has_ufo' flag is just tested; if the incoming stream has the 3254 * flag set we need to check that we have it 3255 */ 3256 static int virtio_net_ufo_post_load(void *opaque, int version_id) 3257 { 3258 struct VirtIONetMigTmp *tmp = opaque; 3259 3260 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 3261 error_report("virtio-net: saved image requires TUN_F_UFO support"); 3262 return -EINVAL; 3263 } 3264 3265 return 0; 3266 } 3267 3268 static int virtio_net_ufo_pre_save(void *opaque) 3269 { 3270 struct VirtIONetMigTmp *tmp = opaque; 3271 3272 tmp->has_ufo = tmp->parent->has_ufo; 3273 3274 return 0; 3275 } 3276 3277 static const VMStateDescription vmstate_virtio_net_has_ufo = { 3278 .name = "virtio-net-ufo", 3279 .post_load = virtio_net_ufo_post_load, 3280 .pre_save = virtio_net_ufo_pre_save, 3281 .fields = (const VMStateField[]) { 3282 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 3283 VMSTATE_END_OF_LIST() 3284 }, 3285 }; 3286 3287 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 3288 * flag set we need to check that we have it 3289 */ 3290 static int virtio_net_vnet_post_load(void *opaque, int version_id) 3291 { 3292 struct VirtIONetMigTmp *tmp = opaque; 3293 3294 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 3295 error_report("virtio-net: saved image requires vnet_hdr=on"); 3296 return -EINVAL; 3297 } 3298 3299 return 0; 3300 } 3301 3302 static int virtio_net_vnet_pre_save(void *opaque) 3303 { 3304 struct VirtIONetMigTmp *tmp = opaque; 3305 3306 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 3307 3308 return 0; 3309 } 3310 3311 static const VMStateDescription vmstate_virtio_net_has_vnet = { 3312 .name = "virtio-net-vnet", 3313 .post_load = virtio_net_vnet_post_load, 3314 .pre_save = virtio_net_vnet_pre_save, 3315 .fields = (const VMStateField[]) { 3316 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 3317 VMSTATE_END_OF_LIST() 3318 }, 3319 }; 3320 3321 static bool virtio_net_rss_needed(void *opaque) 3322 { 3323 return VIRTIO_NET(opaque)->rss_data.enabled; 3324 } 3325 3326 static const VMStateDescription vmstate_virtio_net_rss = { 3327 .name = "virtio-net-device/rss", 3328 .version_id = 1, 3329 .minimum_version_id = 1, 3330 .needed = virtio_net_rss_needed, 3331 .fields = (const VMStateField[]) { 3332 VMSTATE_BOOL(rss_data.enabled, VirtIONet), 3333 VMSTATE_BOOL(rss_data.redirect, VirtIONet), 3334 VMSTATE_BOOL(rss_data.populate_hash, VirtIONet), 3335 VMSTATE_UINT32(rss_data.hash_types, VirtIONet), 3336 VMSTATE_UINT16(rss_data.indirections_len, VirtIONet), 3337 VMSTATE_UINT16(rss_data.default_queue, VirtIONet), 3338 VMSTATE_UINT8_ARRAY(rss_data.key, VirtIONet, 3339 VIRTIO_NET_RSS_MAX_KEY_SIZE), 3340 VMSTATE_VARRAY_UINT16_ALLOC(rss_data.indirections_table, VirtIONet, 3341 rss_data.indirections_len, 0, 3342 vmstate_info_uint16, uint16_t), 3343 VMSTATE_END_OF_LIST() 3344 }, 3345 }; 3346 3347 static struct vhost_dev *virtio_net_get_vhost(VirtIODevice *vdev) 3348 { 3349 VirtIONet *n = VIRTIO_NET(vdev); 3350 NetClientState *nc; 3351 struct vhost_net *net; 3352 3353 if (!n->nic) { 3354 return NULL; 3355 } 3356 3357 nc = qemu_get_queue(n->nic); 3358 if (!nc) { 3359 return NULL; 3360 } 3361 3362 net = get_vhost_net(nc->peer); 3363 if (!net) { 3364 return NULL; 3365 } 3366 3367 return &net->dev; 3368 } 3369 3370 static int vhost_user_net_save_state(QEMUFile *f, void *pv, size_t size, 3371 const VMStateField *field, 3372 JSONWriter *vmdesc) 3373 { 3374 VirtIONet *n = pv; 3375 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3376 struct vhost_dev *vhdev; 3377 Error *local_error = NULL; 3378 int ret; 3379 3380 vhdev = virtio_net_get_vhost(vdev); 3381 if (vhdev == NULL) { 3382 error_reportf_err(local_error, 3383 "Error getting vhost back-end of %s device %s: ", 3384 vdev->name, vdev->parent_obj.canonical_path); 3385 return -1; 3386 } 3387 3388 ret = vhost_save_backend_state(vhdev, f, &local_error); 3389 if (ret < 0) { 3390 error_reportf_err(local_error, 3391 "Error saving back-end state of %s device %s: ", 3392 vdev->name, vdev->parent_obj.canonical_path); 3393 return ret; 3394 } 3395 3396 return 0; 3397 } 3398 3399 static int vhost_user_net_load_state(QEMUFile *f, void *pv, size_t size, 3400 const VMStateField *field) 3401 { 3402 VirtIONet *n = pv; 3403 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3404 struct vhost_dev *vhdev; 3405 Error *local_error = NULL; 3406 int ret; 3407 3408 vhdev = virtio_net_get_vhost(vdev); 3409 if (vhdev == NULL) { 3410 error_reportf_err(local_error, 3411 "Error getting vhost back-end of %s device %s: ", 3412 vdev->name, vdev->parent_obj.canonical_path); 3413 return -1; 3414 } 3415 3416 ret = vhost_load_backend_state(vhdev, f, &local_error); 3417 if (ret < 0) { 3418 error_reportf_err(local_error, 3419 "Error loading back-end state of %s device %s: ", 3420 vdev->name, vdev->parent_obj.canonical_path); 3421 return ret; 3422 } 3423 3424 return 0; 3425 } 3426 3427 static bool vhost_user_net_is_internal_migration(void *opaque) 3428 { 3429 VirtIONet *n = opaque; 3430 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3431 struct vhost_dev *vhdev; 3432 3433 vhdev = virtio_net_get_vhost(vdev); 3434 if (vhdev == NULL) { 3435 return false; 3436 } 3437 3438 return vhost_supports_device_state(vhdev); 3439 } 3440 3441 static const VMStateDescription vhost_user_net_backend_state = { 3442 .name = "virtio-net-device/backend", 3443 .version_id = 0, 3444 .needed = vhost_user_net_is_internal_migration, 3445 .fields = (const VMStateField[]) { 3446 { 3447 .name = "backend", 3448 .info = &(const VMStateInfo) { 3449 .name = "virtio-net vhost-user backend state", 3450 .get = vhost_user_net_load_state, 3451 .put = vhost_user_net_save_state, 3452 }, 3453 }, 3454 VMSTATE_END_OF_LIST() 3455 } 3456 }; 3457 3458 static const VMStateDescription vmstate_virtio_net_device = { 3459 .name = "virtio-net-device", 3460 .version_id = VIRTIO_NET_VM_VERSION, 3461 .minimum_version_id = VIRTIO_NET_VM_VERSION, 3462 .post_load = virtio_net_post_load_device, 3463 .fields = (const VMStateField[]) { 3464 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 3465 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 3466 vmstate_virtio_net_queue_tx_waiting, 3467 VirtIONetQueue), 3468 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 3469 VMSTATE_UINT16(status, VirtIONet), 3470 VMSTATE_UINT8(promisc, VirtIONet), 3471 VMSTATE_UINT8(allmulti, VirtIONet), 3472 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 3473 3474 /* Guarded pair: If it fits we load it, else we throw it away 3475 * - can happen if source has a larger MAC table.; post-load 3476 * sets flags in this case. 3477 */ 3478 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 3479 0, mac_table_fits, mac_table.in_use, 3480 ETH_ALEN), 3481 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 3482 mac_table.in_use, ETH_ALEN), 3483 3484 /* Note: This is an array of uint32's that's always been saved as a 3485 * buffer; hold onto your endiannesses; it's actually used as a bitmap 3486 * but based on the uint. 3487 */ 3488 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 3489 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3490 vmstate_virtio_net_has_vnet), 3491 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 3492 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 3493 VMSTATE_UINT8(alluni, VirtIONet), 3494 VMSTATE_UINT8(nomulti, VirtIONet), 3495 VMSTATE_UINT8(nouni, VirtIONet), 3496 VMSTATE_UINT8(nobcast, VirtIONet), 3497 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3498 vmstate_virtio_net_has_ufo), 3499 VMSTATE_SINGLE_TEST(max_queue_pairs, VirtIONet, max_queue_pairs_gt_1, 0, 3500 vmstate_info_uint16_equal, uint16_t), 3501 VMSTATE_UINT16_TEST(curr_queue_pairs, VirtIONet, max_queue_pairs_gt_1), 3502 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3503 vmstate_virtio_net_tx_waiting), 3504 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 3505 has_ctrl_guest_offloads), 3506 VMSTATE_END_OF_LIST() 3507 }, 3508 .subsections = (const VMStateDescription * const []) { 3509 &vmstate_virtio_net_rss, 3510 &vhost_user_net_backend_state, 3511 NULL 3512 } 3513 }; 3514 3515 static NetClientInfo net_virtio_info = { 3516 .type = NET_CLIENT_DRIVER_NIC, 3517 .size = sizeof(NICState), 3518 .can_receive = virtio_net_can_receive, 3519 .receive = virtio_net_receive, 3520 .link_status_changed = virtio_net_set_link_status, 3521 .query_rx_filter = virtio_net_query_rxfilter, 3522 .announce = virtio_net_announce, 3523 }; 3524 3525 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 3526 { 3527 VirtIONet *n = VIRTIO_NET(vdev); 3528 NetClientState *nc; 3529 assert(n->vhost_started); 3530 if (!n->multiqueue && idx == 2) { 3531 /* Must guard against invalid features and bogus queue index 3532 * from being set by malicious guest, or penetrated through 3533 * buggy migration stream. 3534 */ 3535 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3536 qemu_log_mask(LOG_GUEST_ERROR, 3537 "%s: bogus vq index ignored\n", __func__); 3538 return false; 3539 } 3540 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs); 3541 } else { 3542 nc = qemu_get_subqueue(n->nic, vq2q(idx)); 3543 } 3544 /* 3545 * Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1 3546 * as the macro of configure interrupt's IDX, If this driver does not 3547 * support, the function will return false 3548 */ 3549 3550 if (idx == VIRTIO_CONFIG_IRQ_IDX) { 3551 return vhost_net_config_pending(get_vhost_net(nc->peer)); 3552 } 3553 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 3554 } 3555 3556 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 3557 bool mask) 3558 { 3559 VirtIONet *n = VIRTIO_NET(vdev); 3560 NetClientState *nc; 3561 assert(n->vhost_started); 3562 if (!n->multiqueue && idx == 2) { 3563 /* Must guard against invalid features and bogus queue index 3564 * from being set by malicious guest, or penetrated through 3565 * buggy migration stream. 3566 */ 3567 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3568 qemu_log_mask(LOG_GUEST_ERROR, 3569 "%s: bogus vq index ignored\n", __func__); 3570 return; 3571 } 3572 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs); 3573 } else { 3574 nc = qemu_get_subqueue(n->nic, vq2q(idx)); 3575 } 3576 /* 3577 *Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1 3578 * as the macro of configure interrupt's IDX, If this driver does not 3579 * support, the function will return 3580 */ 3581 3582 if (idx == VIRTIO_CONFIG_IRQ_IDX) { 3583 vhost_net_config_mask(get_vhost_net(nc->peer), vdev, mask); 3584 return; 3585 } 3586 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask); 3587 } 3588 3589 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 3590 { 3591 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 3592 3593 n->config_size = virtio_get_config_size(&cfg_size_params, host_features); 3594 } 3595 3596 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 3597 const char *type) 3598 { 3599 /* 3600 * The name can be NULL, the netclient name will be type.x. 3601 */ 3602 assert(type != NULL); 3603 3604 g_free(n->netclient_name); 3605 g_free(n->netclient_type); 3606 n->netclient_name = g_strdup(name); 3607 n->netclient_type = g_strdup(type); 3608 } 3609 3610 static bool failover_unplug_primary(VirtIONet *n, DeviceState *dev) 3611 { 3612 HotplugHandler *hotplug_ctrl; 3613 PCIDevice *pci_dev; 3614 Error *err = NULL; 3615 3616 hotplug_ctrl = qdev_get_hotplug_handler(dev); 3617 if (hotplug_ctrl) { 3618 pci_dev = PCI_DEVICE(dev); 3619 pci_dev->partially_hotplugged = true; 3620 hotplug_handler_unplug_request(hotplug_ctrl, dev, &err); 3621 if (err) { 3622 error_report_err(err); 3623 return false; 3624 } 3625 } else { 3626 return false; 3627 } 3628 return true; 3629 } 3630 3631 static bool failover_replug_primary(VirtIONet *n, DeviceState *dev, 3632 Error **errp) 3633 { 3634 Error *err = NULL; 3635 HotplugHandler *hotplug_ctrl; 3636 PCIDevice *pdev = PCI_DEVICE(dev); 3637 BusState *primary_bus; 3638 3639 if (!pdev->partially_hotplugged) { 3640 return true; 3641 } 3642 primary_bus = dev->parent_bus; 3643 if (!primary_bus) { 3644 error_setg(errp, "virtio_net: couldn't find primary bus"); 3645 return false; 3646 } 3647 qdev_set_parent_bus(dev, primary_bus, &error_abort); 3648 qatomic_set(&n->failover_primary_hidden, false); 3649 hotplug_ctrl = qdev_get_hotplug_handler(dev); 3650 if (hotplug_ctrl) { 3651 hotplug_handler_pre_plug(hotplug_ctrl, dev, &err); 3652 if (err) { 3653 goto out; 3654 } 3655 hotplug_handler_plug(hotplug_ctrl, dev, &err); 3656 } 3657 pdev->partially_hotplugged = false; 3658 3659 out: 3660 error_propagate(errp, err); 3661 return !err; 3662 } 3663 3664 static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e) 3665 { 3666 bool should_be_hidden; 3667 Error *err = NULL; 3668 DeviceState *dev = failover_find_primary_device(n); 3669 3670 if (!dev) { 3671 return; 3672 } 3673 3674 should_be_hidden = qatomic_read(&n->failover_primary_hidden); 3675 3676 if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) { 3677 if (failover_unplug_primary(n, dev)) { 3678 vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev); 3679 qapi_event_send_unplug_primary(dev->id); 3680 qatomic_set(&n->failover_primary_hidden, true); 3681 } else { 3682 warn_report("couldn't unplug primary device"); 3683 } 3684 } else if (e->type == MIG_EVENT_PRECOPY_FAILED) { 3685 /* We already unplugged the device let's plug it back */ 3686 if (!failover_replug_primary(n, dev, &err)) { 3687 if (err) { 3688 error_report_err(err); 3689 } 3690 } 3691 } 3692 } 3693 3694 static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier, 3695 MigrationEvent *e, Error **errp) 3696 { 3697 VirtIONet *n = container_of(notifier, VirtIONet, migration_state); 3698 virtio_net_handle_migration_primary(n, e); 3699 return 0; 3700 } 3701 3702 static bool failover_hide_primary_device(DeviceListener *listener, 3703 const QDict *device_opts, 3704 bool from_json, 3705 Error **errp) 3706 { 3707 VirtIONet *n = container_of(listener, VirtIONet, primary_listener); 3708 const char *standby_id; 3709 3710 if (!device_opts) { 3711 return false; 3712 } 3713 3714 if (!qdict_haskey(device_opts, "failover_pair_id")) { 3715 return false; 3716 } 3717 3718 if (!qdict_haskey(device_opts, "id")) { 3719 error_setg(errp, "Device with failover_pair_id needs to have id"); 3720 return false; 3721 } 3722 3723 standby_id = qdict_get_str(device_opts, "failover_pair_id"); 3724 if (g_strcmp0(standby_id, n->netclient_name) != 0) { 3725 return false; 3726 } 3727 3728 /* 3729 * The hide helper can be called several times for a given device. 3730 * Check there is only one primary for a virtio-net device but 3731 * don't duplicate the qdict several times if it's called for the same 3732 * device. 3733 */ 3734 if (n->primary_opts) { 3735 const char *old, *new; 3736 /* devices with failover_pair_id always have an id */ 3737 old = qdict_get_str(n->primary_opts, "id"); 3738 new = qdict_get_str(device_opts, "id"); 3739 if (strcmp(old, new) != 0) { 3740 error_setg(errp, "Cannot attach more than one primary device to " 3741 "'%s': '%s' and '%s'", n->netclient_name, old, new); 3742 return false; 3743 } 3744 } else { 3745 n->primary_opts = qdict_clone_shallow(device_opts); 3746 n->primary_opts_from_json = from_json; 3747 } 3748 3749 /* failover_primary_hidden is set during feature negotiation */ 3750 return qatomic_read(&n->failover_primary_hidden); 3751 } 3752 3753 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 3754 { 3755 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3756 VirtIONet *n = VIRTIO_NET(dev); 3757 NetClientState *nc; 3758 int i; 3759 3760 if (n->net_conf.mtu) { 3761 n->host_features |= (1ULL << VIRTIO_NET_F_MTU); 3762 } 3763 3764 if (n->net_conf.duplex_str) { 3765 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) { 3766 n->net_conf.duplex = DUPLEX_HALF; 3767 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) { 3768 n->net_conf.duplex = DUPLEX_FULL; 3769 } else { 3770 error_setg(errp, "'duplex' must be 'half' or 'full'"); 3771 return; 3772 } 3773 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 3774 } else { 3775 n->net_conf.duplex = DUPLEX_UNKNOWN; 3776 } 3777 3778 if (n->net_conf.speed < SPEED_UNKNOWN) { 3779 error_setg(errp, "'speed' must be between 0 and INT_MAX"); 3780 return; 3781 } 3782 if (n->net_conf.speed >= 0) { 3783 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 3784 } 3785 3786 if (n->failover) { 3787 n->primary_listener.hide_device = failover_hide_primary_device; 3788 qatomic_set(&n->failover_primary_hidden, true); 3789 device_listener_register(&n->primary_listener); 3790 migration_add_notifier(&n->migration_state, 3791 virtio_net_migration_state_notifier); 3792 n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY); 3793 } 3794 3795 virtio_net_set_config_size(n, n->host_features); 3796 virtio_init(vdev, VIRTIO_ID_NET, n->config_size); 3797 3798 /* 3799 * We set a lower limit on RX queue size to what it always was. 3800 * Guests that want a smaller ring can always resize it without 3801 * help from us (using virtio 1 and up). 3802 */ 3803 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 3804 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 3805 !is_power_of_2(n->net_conf.rx_queue_size)) { 3806 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 3807 "must be a power of 2 between %d and %d.", 3808 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 3809 VIRTQUEUE_MAX_SIZE); 3810 virtio_cleanup(vdev); 3811 return; 3812 } 3813 3814 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || 3815 n->net_conf.tx_queue_size > virtio_net_max_tx_queue_size(n) || 3816 !is_power_of_2(n->net_conf.tx_queue_size)) { 3817 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " 3818 "must be a power of 2 between %d and %d", 3819 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, 3820 virtio_net_max_tx_queue_size(n)); 3821 virtio_cleanup(vdev); 3822 return; 3823 } 3824 3825 n->max_ncs = MAX(n->nic_conf.peers.queues, 1); 3826 3827 /* 3828 * Figure out the datapath queue pairs since the backend could 3829 * provide control queue via peers as well. 3830 */ 3831 if (n->nic_conf.peers.queues) { 3832 for (i = 0; i < n->max_ncs; i++) { 3833 if (n->nic_conf.peers.ncs[i]->is_datapath) { 3834 ++n->max_queue_pairs; 3835 } 3836 } 3837 } 3838 n->max_queue_pairs = MAX(n->max_queue_pairs, 1); 3839 3840 if (n->max_queue_pairs * 2 + 1 > VIRTIO_QUEUE_MAX) { 3841 error_setg(errp, "Invalid number of queue pairs (= %" PRIu32 "), " 3842 "must be a positive integer less than %d.", 3843 n->max_queue_pairs, (VIRTIO_QUEUE_MAX - 1) / 2); 3844 virtio_cleanup(vdev); 3845 return; 3846 } 3847 n->vqs = g_new0(VirtIONetQueue, n->max_queue_pairs); 3848 n->curr_queue_pairs = 1; 3849 n->tx_timeout = n->net_conf.txtimer; 3850 3851 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 3852 && strcmp(n->net_conf.tx, "bh")) { 3853 warn_report("virtio-net: " 3854 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 3855 n->net_conf.tx); 3856 error_printf("Defaulting to \"bh\""); 3857 } 3858 3859 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), 3860 n->net_conf.tx_queue_size); 3861 3862 virtio_net_add_queue(n, 0); 3863 3864 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 3865 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 3866 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 3867 n->status = VIRTIO_NET_S_LINK_UP; 3868 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 3869 QEMU_CLOCK_VIRTUAL, 3870 virtio_net_announce_timer, n); 3871 n->announce_timer.round = 0; 3872 3873 if (n->netclient_type) { 3874 /* 3875 * Happen when virtio_net_set_netclient_name has been called. 3876 */ 3877 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3878 n->netclient_type, n->netclient_name, 3879 &dev->mem_reentrancy_guard, n); 3880 } else { 3881 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3882 object_get_typename(OBJECT(dev)), dev->id, 3883 &dev->mem_reentrancy_guard, n); 3884 } 3885 3886 for (i = 0; i < n->max_queue_pairs; i++) { 3887 n->nic->ncs[i].do_not_pad = true; 3888 } 3889 3890 peer_test_vnet_hdr(n); 3891 if (peer_has_vnet_hdr(n)) { 3892 n->host_hdr_len = sizeof(struct virtio_net_hdr); 3893 } else { 3894 n->host_hdr_len = 0; 3895 } 3896 3897 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 3898 3899 n->vqs[0].tx_waiting = 0; 3900 n->tx_burst = n->net_conf.txburst; 3901 virtio_net_set_mrg_rx_bufs(n, 0, 0, 0); 3902 n->promisc = 1; /* for compatibility */ 3903 3904 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 3905 3906 n->vlans = g_malloc0(MAX_VLAN >> 3); 3907 3908 nc = qemu_get_queue(n->nic); 3909 nc->rxfilter_notify_enabled = 1; 3910 3911 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 3912 struct virtio_net_config netcfg = {}; 3913 memcpy(&netcfg.mac, &n->nic_conf.macaddr, ETH_ALEN); 3914 vhost_net_set_config(get_vhost_net(nc->peer), 3915 (uint8_t *)&netcfg, 0, ETH_ALEN, VHOST_SET_CONFIG_TYPE_FRONTEND); 3916 } 3917 QTAILQ_INIT(&n->rsc_chains); 3918 n->qdev = dev; 3919 3920 net_rx_pkt_init(&n->rx_pkt); 3921 3922 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { 3923 virtio_net_load_ebpf(n, errp); 3924 } 3925 } 3926 3927 static void virtio_net_device_unrealize(DeviceState *dev) 3928 { 3929 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3930 VirtIONet *n = VIRTIO_NET(dev); 3931 int i, max_queue_pairs; 3932 3933 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { 3934 virtio_net_unload_ebpf(n); 3935 } 3936 3937 /* This will stop vhost backend if appropriate. */ 3938 virtio_net_set_status(vdev, 0); 3939 3940 g_free(n->netclient_name); 3941 n->netclient_name = NULL; 3942 g_free(n->netclient_type); 3943 n->netclient_type = NULL; 3944 3945 g_free(n->mac_table.macs); 3946 g_free(n->vlans); 3947 3948 if (n->failover) { 3949 qobject_unref(n->primary_opts); 3950 device_listener_unregister(&n->primary_listener); 3951 migration_remove_notifier(&n->migration_state); 3952 } else { 3953 assert(n->primary_opts == NULL); 3954 } 3955 3956 max_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 3957 for (i = 0; i < max_queue_pairs; i++) { 3958 virtio_net_del_queue(n, i); 3959 } 3960 /* delete also control vq */ 3961 virtio_del_queue(vdev, max_queue_pairs * 2); 3962 qemu_announce_timer_del(&n->announce_timer, false); 3963 g_free(n->vqs); 3964 qemu_del_nic(n->nic); 3965 virtio_net_rsc_cleanup(n); 3966 g_free(n->rss_data.indirections_table); 3967 net_rx_pkt_uninit(n->rx_pkt); 3968 virtio_cleanup(vdev); 3969 } 3970 3971 static void virtio_net_reset(VirtIODevice *vdev) 3972 { 3973 VirtIONet *n = VIRTIO_NET(vdev); 3974 int i; 3975 3976 /* Reset back to compatibility mode */ 3977 n->promisc = 1; 3978 n->allmulti = 0; 3979 n->alluni = 0; 3980 n->nomulti = 0; 3981 n->nouni = 0; 3982 n->nobcast = 0; 3983 /* multiqueue is disabled by default */ 3984 n->curr_queue_pairs = 1; 3985 timer_del(n->announce_timer.tm); 3986 n->announce_timer.round = 0; 3987 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 3988 3989 /* Flush any MAC and VLAN filter table state */ 3990 n->mac_table.in_use = 0; 3991 n->mac_table.first_multi = 0; 3992 n->mac_table.multi_overflow = 0; 3993 n->mac_table.uni_overflow = 0; 3994 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 3995 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 3996 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 3997 memset(n->vlans, 0, MAX_VLAN >> 3); 3998 3999 /* Flush any async TX */ 4000 for (i = 0; i < n->max_queue_pairs; i++) { 4001 flush_or_purge_queued_packets(qemu_get_subqueue(n->nic, i)); 4002 } 4003 4004 virtio_net_disable_rss(n); 4005 } 4006 4007 static void virtio_net_instance_init(Object *obj) 4008 { 4009 VirtIONet *n = VIRTIO_NET(obj); 4010 4011 /* 4012 * The default config_size is sizeof(struct virtio_net_config). 4013 * Can be overridden with virtio_net_set_config_size. 4014 */ 4015 n->config_size = sizeof(struct virtio_net_config); 4016 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 4017 "bootindex", "/ethernet-phy@0", 4018 DEVICE(n)); 4019 4020 ebpf_rss_init(&n->ebpf_rss); 4021 } 4022 4023 static int virtio_net_pre_save(void *opaque) 4024 { 4025 VirtIONet *n = opaque; 4026 4027 /* At this point, backend must be stopped, otherwise 4028 * it might keep writing to memory. */ 4029 assert(!n->vhost_started); 4030 4031 return 0; 4032 } 4033 4034 static bool primary_unplug_pending(void *opaque) 4035 { 4036 DeviceState *dev = opaque; 4037 DeviceState *primary; 4038 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 4039 VirtIONet *n = VIRTIO_NET(vdev); 4040 4041 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4042 return false; 4043 } 4044 primary = failover_find_primary_device(n); 4045 return primary ? primary->pending_deleted_event : false; 4046 } 4047 4048 static bool dev_unplug_pending(void *opaque) 4049 { 4050 DeviceState *dev = opaque; 4051 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); 4052 4053 return vdc->primary_unplug_pending(dev); 4054 } 4055 4056 static const VMStateDescription vmstate_virtio_net = { 4057 .name = "virtio-net", 4058 .minimum_version_id = VIRTIO_NET_VM_VERSION, 4059 .version_id = VIRTIO_NET_VM_VERSION, 4060 .fields = (const VMStateField[]) { 4061 VMSTATE_VIRTIO_DEVICE, 4062 VMSTATE_END_OF_LIST() 4063 }, 4064 .pre_save = virtio_net_pre_save, 4065 .dev_unplug_pending = dev_unplug_pending, 4066 }; 4067 4068 static const Property virtio_net_properties[] = { 4069 DEFINE_PROP_BIT64("csum", VirtIONet, host_features, 4070 VIRTIO_NET_F_CSUM, true), 4071 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features, 4072 VIRTIO_NET_F_GUEST_CSUM, true), 4073 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 4074 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features, 4075 VIRTIO_NET_F_GUEST_TSO4, true), 4076 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features, 4077 VIRTIO_NET_F_GUEST_TSO6, true), 4078 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features, 4079 VIRTIO_NET_F_GUEST_ECN, true), 4080 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features, 4081 VIRTIO_NET_F_GUEST_UFO, true), 4082 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features, 4083 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 4084 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features, 4085 VIRTIO_NET_F_HOST_TSO4, true), 4086 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features, 4087 VIRTIO_NET_F_HOST_TSO6, true), 4088 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features, 4089 VIRTIO_NET_F_HOST_ECN, true), 4090 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features, 4091 VIRTIO_NET_F_HOST_UFO, true), 4092 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features, 4093 VIRTIO_NET_F_MRG_RXBUF, true), 4094 DEFINE_PROP_BIT64("status", VirtIONet, host_features, 4095 VIRTIO_NET_F_STATUS, true), 4096 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features, 4097 VIRTIO_NET_F_CTRL_VQ, true), 4098 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features, 4099 VIRTIO_NET_F_CTRL_RX, true), 4100 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features, 4101 VIRTIO_NET_F_CTRL_VLAN, true), 4102 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features, 4103 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 4104 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features, 4105 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 4106 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features, 4107 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 4108 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 4109 DEFINE_PROP_BIT64("rss", VirtIONet, host_features, 4110 VIRTIO_NET_F_RSS, false), 4111 DEFINE_PROP_BIT64("hash", VirtIONet, host_features, 4112 VIRTIO_NET_F_HASH_REPORT, false), 4113 DEFINE_PROP_ARRAY("ebpf-rss-fds", VirtIONet, nr_ebpf_rss_fds, 4114 ebpf_rss_fds, qdev_prop_string, char*), 4115 DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features, 4116 VIRTIO_NET_F_RSC_EXT, false), 4117 DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout, 4118 VIRTIO_NET_RSC_DEFAULT_INTERVAL), 4119 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 4120 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 4121 TX_TIMER_INTERVAL), 4122 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 4123 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 4124 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 4125 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 4126 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 4127 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), 4128 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 4129 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 4130 true), 4131 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN), 4132 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str), 4133 DEFINE_PROP_BOOL("failover", VirtIONet, failover, false), 4134 DEFINE_PROP_BIT64("guest_uso4", VirtIONet, host_features, 4135 VIRTIO_NET_F_GUEST_USO4, true), 4136 DEFINE_PROP_BIT64("guest_uso6", VirtIONet, host_features, 4137 VIRTIO_NET_F_GUEST_USO6, true), 4138 DEFINE_PROP_BIT64("host_uso", VirtIONet, host_features, 4139 VIRTIO_NET_F_HOST_USO, true), 4140 }; 4141 4142 static void virtio_net_class_init(ObjectClass *klass, void *data) 4143 { 4144 DeviceClass *dc = DEVICE_CLASS(klass); 4145 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 4146 4147 device_class_set_props(dc, virtio_net_properties); 4148 dc->vmsd = &vmstate_virtio_net; 4149 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 4150 vdc->realize = virtio_net_device_realize; 4151 vdc->unrealize = virtio_net_device_unrealize; 4152 vdc->get_config = virtio_net_get_config; 4153 vdc->set_config = virtio_net_set_config; 4154 vdc->get_features = virtio_net_get_features; 4155 vdc->set_features = virtio_net_set_features; 4156 vdc->bad_features = virtio_net_bad_features; 4157 vdc->reset = virtio_net_reset; 4158 vdc->queue_reset = virtio_net_queue_reset; 4159 vdc->queue_enable = virtio_net_queue_enable; 4160 vdc->set_status = virtio_net_set_status; 4161 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 4162 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 4163 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 4164 vdc->pre_load_queues = virtio_net_pre_load_queues; 4165 vdc->post_load = virtio_net_post_load_virtio; 4166 vdc->vmsd = &vmstate_virtio_net_device; 4167 vdc->primary_unplug_pending = primary_unplug_pending; 4168 vdc->get_vhost = virtio_net_get_vhost; 4169 vdc->toggle_device_iotlb = vhost_toggle_device_iotlb; 4170 } 4171 4172 static const TypeInfo virtio_net_info = { 4173 .name = TYPE_VIRTIO_NET, 4174 .parent = TYPE_VIRTIO_DEVICE, 4175 .instance_size = sizeof(VirtIONet), 4176 .instance_init = virtio_net_instance_init, 4177 .class_init = virtio_net_class_init, 4178 }; 4179 4180 static void virtio_register_types(void) 4181 { 4182 type_register_static(&virtio_net_info); 4183 } 4184 4185 type_init(virtio_register_types) 4186