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 "qapi/qmp/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 "sysemu/sysemu.h" 43 #include "sysemu/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 "sysemu/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 bool ret = false; 1356 1357 if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) { 1358 trace_virtio_net_rss_load(n, n->nr_ebpf_rss_fds, n->ebpf_rss_fds); 1359 if (n->ebpf_rss_fds) { 1360 ret = virtio_net_load_ebpf_fds(n, errp); 1361 } else { 1362 ret = ebpf_rss_load(&n->ebpf_rss, errp); 1363 } 1364 } 1365 1366 return ret; 1367 } 1368 1369 static void virtio_net_unload_ebpf(VirtIONet *n) 1370 { 1371 virtio_net_attach_ebpf_to_backend(n->nic, -1); 1372 ebpf_rss_unload(&n->ebpf_rss); 1373 } 1374 1375 static uint16_t virtio_net_handle_rss(VirtIONet *n, 1376 struct iovec *iov, 1377 unsigned int iov_cnt, 1378 bool do_rss) 1379 { 1380 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1381 struct virtio_net_rss_config cfg; 1382 size_t s, offset = 0, size_get; 1383 uint16_t queue_pairs, i; 1384 struct { 1385 uint16_t us; 1386 uint8_t b; 1387 } QEMU_PACKED temp; 1388 const char *err_msg = ""; 1389 uint32_t err_value = 0; 1390 1391 if (do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_RSS)) { 1392 err_msg = "RSS is not negotiated"; 1393 goto error; 1394 } 1395 if (!do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) { 1396 err_msg = "Hash report is not negotiated"; 1397 goto error; 1398 } 1399 size_get = offsetof(struct virtio_net_rss_config, indirection_table); 1400 s = iov_to_buf(iov, iov_cnt, offset, &cfg, size_get); 1401 if (s != size_get) { 1402 err_msg = "Short command buffer"; 1403 err_value = (uint32_t)s; 1404 goto error; 1405 } 1406 n->rss_data.hash_types = virtio_ldl_p(vdev, &cfg.hash_types); 1407 n->rss_data.indirections_len = 1408 virtio_lduw_p(vdev, &cfg.indirection_table_mask); 1409 if (!do_rss) { 1410 n->rss_data.indirections_len = 0; 1411 } 1412 if (n->rss_data.indirections_len >= VIRTIO_NET_RSS_MAX_TABLE_LEN) { 1413 err_msg = "Too large indirection table"; 1414 err_value = n->rss_data.indirections_len; 1415 goto error; 1416 } 1417 n->rss_data.indirections_len++; 1418 if (!is_power_of_2(n->rss_data.indirections_len)) { 1419 err_msg = "Invalid size of indirection table"; 1420 err_value = n->rss_data.indirections_len; 1421 goto error; 1422 } 1423 n->rss_data.default_queue = do_rss ? 1424 virtio_lduw_p(vdev, &cfg.unclassified_queue) : 0; 1425 if (n->rss_data.default_queue >= n->max_queue_pairs) { 1426 err_msg = "Invalid default queue"; 1427 err_value = n->rss_data.default_queue; 1428 goto error; 1429 } 1430 offset += size_get; 1431 size_get = sizeof(uint16_t) * n->rss_data.indirections_len; 1432 g_free(n->rss_data.indirections_table); 1433 n->rss_data.indirections_table = g_malloc(size_get); 1434 if (!n->rss_data.indirections_table) { 1435 err_msg = "Can't allocate indirections table"; 1436 err_value = n->rss_data.indirections_len; 1437 goto error; 1438 } 1439 s = iov_to_buf(iov, iov_cnt, offset, 1440 n->rss_data.indirections_table, size_get); 1441 if (s != size_get) { 1442 err_msg = "Short indirection table buffer"; 1443 err_value = (uint32_t)s; 1444 goto error; 1445 } 1446 for (i = 0; i < n->rss_data.indirections_len; ++i) { 1447 uint16_t val = n->rss_data.indirections_table[i]; 1448 n->rss_data.indirections_table[i] = virtio_lduw_p(vdev, &val); 1449 } 1450 offset += size_get; 1451 size_get = sizeof(temp); 1452 s = iov_to_buf(iov, iov_cnt, offset, &temp, size_get); 1453 if (s != size_get) { 1454 err_msg = "Can't get queue_pairs"; 1455 err_value = (uint32_t)s; 1456 goto error; 1457 } 1458 queue_pairs = do_rss ? virtio_lduw_p(vdev, &temp.us) : n->curr_queue_pairs; 1459 if (queue_pairs == 0 || queue_pairs > n->max_queue_pairs) { 1460 err_msg = "Invalid number of queue_pairs"; 1461 err_value = queue_pairs; 1462 goto error; 1463 } 1464 if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) { 1465 err_msg = "Invalid key size"; 1466 err_value = temp.b; 1467 goto error; 1468 } 1469 if (!temp.b && n->rss_data.hash_types) { 1470 err_msg = "No key provided"; 1471 err_value = 0; 1472 goto error; 1473 } 1474 if (!temp.b && !n->rss_data.hash_types) { 1475 virtio_net_disable_rss(n); 1476 return queue_pairs; 1477 } 1478 offset += size_get; 1479 size_get = temp.b; 1480 s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get); 1481 if (s != size_get) { 1482 err_msg = "Can get key buffer"; 1483 err_value = (uint32_t)s; 1484 goto error; 1485 } 1486 n->rss_data.enabled = true; 1487 virtio_net_commit_rss_config(n); 1488 return queue_pairs; 1489 error: 1490 trace_virtio_net_rss_error(n, err_msg, err_value); 1491 virtio_net_disable_rss(n); 1492 return 0; 1493 } 1494 1495 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, 1496 struct iovec *iov, unsigned int iov_cnt) 1497 { 1498 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1499 uint16_t queue_pairs; 1500 NetClientState *nc = qemu_get_queue(n->nic); 1501 1502 virtio_net_disable_rss(n); 1503 if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) { 1504 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, false); 1505 return queue_pairs ? VIRTIO_NET_OK : VIRTIO_NET_ERR; 1506 } 1507 if (cmd == VIRTIO_NET_CTRL_MQ_RSS_CONFIG) { 1508 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, true); 1509 } else if (cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { 1510 struct virtio_net_ctrl_mq mq; 1511 size_t s; 1512 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ)) { 1513 return VIRTIO_NET_ERR; 1514 } 1515 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); 1516 if (s != sizeof(mq)) { 1517 return VIRTIO_NET_ERR; 1518 } 1519 queue_pairs = virtio_lduw_p(vdev, &mq.virtqueue_pairs); 1520 1521 } else { 1522 return VIRTIO_NET_ERR; 1523 } 1524 1525 if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1526 queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1527 queue_pairs > n->max_queue_pairs || 1528 !n->multiqueue) { 1529 return VIRTIO_NET_ERR; 1530 } 1531 1532 n->curr_queue_pairs = queue_pairs; 1533 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 1534 /* 1535 * Avoid updating the backend for a vdpa device: We're only interested 1536 * in updating the device model queues. 1537 */ 1538 return VIRTIO_NET_OK; 1539 } 1540 /* stop the backend before changing the number of queue_pairs to avoid handling a 1541 * disabled queue */ 1542 virtio_net_set_status(vdev, vdev->status); 1543 virtio_net_set_queue_pairs(n); 1544 1545 return VIRTIO_NET_OK; 1546 } 1547 1548 size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev, 1549 const struct iovec *in_sg, unsigned in_num, 1550 const struct iovec *out_sg, 1551 unsigned out_num) 1552 { 1553 VirtIONet *n = VIRTIO_NET(vdev); 1554 struct virtio_net_ctrl_hdr ctrl; 1555 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 1556 size_t s; 1557 struct iovec *iov, *iov2; 1558 1559 if (iov_size(in_sg, in_num) < sizeof(status) || 1560 iov_size(out_sg, out_num) < sizeof(ctrl)) { 1561 virtio_error(vdev, "virtio-net ctrl missing headers"); 1562 return 0; 1563 } 1564 1565 iov2 = iov = g_memdup2(out_sg, sizeof(struct iovec) * out_num); 1566 s = iov_to_buf(iov, out_num, 0, &ctrl, sizeof(ctrl)); 1567 iov_discard_front(&iov, &out_num, sizeof(ctrl)); 1568 if (s != sizeof(ctrl)) { 1569 status = VIRTIO_NET_ERR; 1570 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { 1571 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, out_num); 1572 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { 1573 status = virtio_net_handle_mac(n, ctrl.cmd, iov, out_num); 1574 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { 1575 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, out_num); 1576 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { 1577 status = virtio_net_handle_announce(n, ctrl.cmd, iov, out_num); 1578 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { 1579 status = virtio_net_handle_mq(n, ctrl.cmd, iov, out_num); 1580 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { 1581 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, out_num); 1582 } 1583 1584 s = iov_from_buf(in_sg, in_num, 0, &status, sizeof(status)); 1585 assert(s == sizeof(status)); 1586 1587 g_free(iov2); 1588 return sizeof(status); 1589 } 1590 1591 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 1592 { 1593 VirtQueueElement *elem; 1594 1595 for (;;) { 1596 size_t written; 1597 elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); 1598 if (!elem) { 1599 break; 1600 } 1601 1602 written = virtio_net_handle_ctrl_iov(vdev, elem->in_sg, elem->in_num, 1603 elem->out_sg, elem->out_num); 1604 if (written > 0) { 1605 virtqueue_push(vq, elem, written); 1606 virtio_notify(vdev, vq); 1607 g_free(elem); 1608 } else { 1609 virtqueue_detach_element(vq, elem, 0); 1610 g_free(elem); 1611 break; 1612 } 1613 } 1614 } 1615 1616 /* RX */ 1617 1618 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) 1619 { 1620 VirtIONet *n = VIRTIO_NET(vdev); 1621 int queue_index = vq2q(virtio_get_queue_index(vq)); 1622 1623 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); 1624 } 1625 1626 static bool virtio_net_can_receive(NetClientState *nc) 1627 { 1628 VirtIONet *n = qemu_get_nic_opaque(nc); 1629 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1630 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 1631 1632 if (!vdev->vm_running) { 1633 return false; 1634 } 1635 1636 if (nc->queue_index >= n->curr_queue_pairs) { 1637 return false; 1638 } 1639 1640 if (!virtio_queue_ready(q->rx_vq) || 1641 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1642 return false; 1643 } 1644 1645 return true; 1646 } 1647 1648 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) 1649 { 1650 int opaque; 1651 unsigned int in_bytes; 1652 VirtIONet *n = q->n; 1653 1654 while (virtio_queue_empty(q->rx_vq) || n->mergeable_rx_bufs) { 1655 opaque = virtqueue_get_avail_bytes(q->rx_vq, &in_bytes, NULL, 1656 bufsize, 0); 1657 /* Buffer is enough, disable notifiaction */ 1658 if (bufsize <= in_bytes) { 1659 break; 1660 } 1661 1662 if (virtio_queue_enable_notification_and_check(q->rx_vq, opaque)) { 1663 /* Guest has added some buffers, try again */ 1664 continue; 1665 } else { 1666 return 0; 1667 } 1668 } 1669 1670 virtio_queue_set_notification(q->rx_vq, 0); 1671 1672 return 1; 1673 } 1674 1675 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) 1676 { 1677 virtio_tswap16s(vdev, &hdr->hdr_len); 1678 virtio_tswap16s(vdev, &hdr->gso_size); 1679 virtio_tswap16s(vdev, &hdr->csum_start); 1680 virtio_tswap16s(vdev, &hdr->csum_offset); 1681 } 1682 1683 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so 1684 * it never finds out that the packets don't have valid checksums. This 1685 * causes dhclient to get upset. Fedora's carried a patch for ages to 1686 * fix this with Xen but it hasn't appeared in an upstream release of 1687 * dhclient yet. 1688 * 1689 * To avoid breaking existing guests, we catch udp packets and add 1690 * checksums. This is terrible but it's better than hacking the guest 1691 * kernels. 1692 * 1693 * N.B. if we introduce a zero-copy API, this operation is no longer free so 1694 * we should provide a mechanism to disable it to avoid polluting the host 1695 * cache. 1696 */ 1697 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, 1698 uint8_t *buf, size_t size) 1699 { 1700 size_t csum_size = ETH_HLEN + sizeof(struct ip_header) + 1701 sizeof(struct udp_header); 1702 1703 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ 1704 (size >= csum_size && size < 1500) && /* normal sized MTU */ 1705 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ 1706 (buf[23] == 17) && /* ip.protocol == UDP */ 1707 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ 1708 net_checksum_calculate(buf, size, CSUM_UDP); 1709 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; 1710 } 1711 } 1712 1713 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, 1714 const void *buf, size_t size) 1715 { 1716 if (n->has_vnet_hdr) { 1717 /* FIXME this cast is evil */ 1718 void *wbuf = (void *)buf; 1719 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, 1720 size - n->host_hdr_len); 1721 1722 if (n->needs_vnet_hdr_swap) { 1723 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); 1724 } 1725 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); 1726 } else { 1727 struct virtio_net_hdr hdr = { 1728 .flags = 0, 1729 .gso_type = VIRTIO_NET_HDR_GSO_NONE 1730 }; 1731 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); 1732 } 1733 } 1734 1735 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) 1736 { 1737 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 1738 static const uint8_t vlan[] = {0x81, 0x00}; 1739 uint8_t *ptr = (uint8_t *)buf; 1740 int i; 1741 1742 if (n->promisc) 1743 return 1; 1744 1745 ptr += n->host_hdr_len; 1746 1747 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { 1748 int vid = lduw_be_p(ptr + 14) & 0xfff; 1749 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) 1750 return 0; 1751 } 1752 1753 if (ptr[0] & 1) { // multicast 1754 if (!memcmp(ptr, bcast, sizeof(bcast))) { 1755 return !n->nobcast; 1756 } else if (n->nomulti) { 1757 return 0; 1758 } else if (n->allmulti || n->mac_table.multi_overflow) { 1759 return 1; 1760 } 1761 1762 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { 1763 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1764 return 1; 1765 } 1766 } 1767 } else { // unicast 1768 if (n->nouni) { 1769 return 0; 1770 } else if (n->alluni || n->mac_table.uni_overflow) { 1771 return 1; 1772 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { 1773 return 1; 1774 } 1775 1776 for (i = 0; i < n->mac_table.first_multi; i++) { 1777 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { 1778 return 1; 1779 } 1780 } 1781 } 1782 1783 return 0; 1784 } 1785 1786 static uint8_t virtio_net_get_hash_type(bool hasip4, 1787 bool hasip6, 1788 EthL4HdrProto l4hdr_proto, 1789 uint32_t types) 1790 { 1791 if (hasip4) { 1792 switch (l4hdr_proto) { 1793 case ETH_L4_HDR_PROTO_TCP: 1794 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 1795 return NetPktRssIpV4Tcp; 1796 } 1797 break; 1798 1799 case ETH_L4_HDR_PROTO_UDP: 1800 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 1801 return NetPktRssIpV4Udp; 1802 } 1803 break; 1804 1805 default: 1806 break; 1807 } 1808 1809 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 1810 return NetPktRssIpV4; 1811 } 1812 } else if (hasip6) { 1813 switch (l4hdr_proto) { 1814 case ETH_L4_HDR_PROTO_TCP: 1815 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) { 1816 return NetPktRssIpV6TcpEx; 1817 } 1818 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 1819 return NetPktRssIpV6Tcp; 1820 } 1821 break; 1822 1823 case ETH_L4_HDR_PROTO_UDP: 1824 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) { 1825 return NetPktRssIpV6UdpEx; 1826 } 1827 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 1828 return NetPktRssIpV6Udp; 1829 } 1830 break; 1831 1832 default: 1833 break; 1834 } 1835 1836 if (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) { 1837 return NetPktRssIpV6Ex; 1838 } 1839 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 1840 return NetPktRssIpV6; 1841 } 1842 } 1843 return 0xff; 1844 } 1845 1846 static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf, 1847 size_t size, 1848 struct virtio_net_hdr_v1_hash *hdr) 1849 { 1850 VirtIONet *n = qemu_get_nic_opaque(nc); 1851 unsigned int index = nc->queue_index, new_index = index; 1852 struct NetRxPkt *pkt = n->rx_pkt; 1853 uint8_t net_hash_type; 1854 uint32_t hash; 1855 bool hasip4, hasip6; 1856 EthL4HdrProto l4hdr_proto; 1857 static const uint8_t reports[NetPktRssIpV6UdpEx + 1] = { 1858 VIRTIO_NET_HASH_REPORT_IPv4, 1859 VIRTIO_NET_HASH_REPORT_TCPv4, 1860 VIRTIO_NET_HASH_REPORT_TCPv6, 1861 VIRTIO_NET_HASH_REPORT_IPv6, 1862 VIRTIO_NET_HASH_REPORT_IPv6_EX, 1863 VIRTIO_NET_HASH_REPORT_TCPv6_EX, 1864 VIRTIO_NET_HASH_REPORT_UDPv4, 1865 VIRTIO_NET_HASH_REPORT_UDPv6, 1866 VIRTIO_NET_HASH_REPORT_UDPv6_EX 1867 }; 1868 struct iovec iov = { 1869 .iov_base = (void *)buf, 1870 .iov_len = size 1871 }; 1872 1873 net_rx_pkt_set_protocols(pkt, &iov, 1, n->host_hdr_len); 1874 net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto); 1875 net_hash_type = virtio_net_get_hash_type(hasip4, hasip6, l4hdr_proto, 1876 n->rss_data.hash_types); 1877 if (net_hash_type > NetPktRssIpV6UdpEx) { 1878 if (n->rss_data.populate_hash) { 1879 hdr->hash_value = VIRTIO_NET_HASH_REPORT_NONE; 1880 hdr->hash_report = 0; 1881 } 1882 return n->rss_data.redirect ? n->rss_data.default_queue : -1; 1883 } 1884 1885 hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key); 1886 1887 if (n->rss_data.populate_hash) { 1888 hdr->hash_value = hash; 1889 hdr->hash_report = reports[net_hash_type]; 1890 } 1891 1892 if (n->rss_data.redirect) { 1893 new_index = hash & (n->rss_data.indirections_len - 1); 1894 new_index = n->rss_data.indirections_table[new_index]; 1895 } 1896 1897 return (index == new_index) ? -1 : new_index; 1898 } 1899 1900 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, 1901 size_t size) 1902 { 1903 VirtIONet *n = qemu_get_nic_opaque(nc); 1904 VirtIONetQueue *q; 1905 VirtIODevice *vdev = VIRTIO_DEVICE(n); 1906 VirtQueueElement *elems[VIRTQUEUE_MAX_SIZE]; 1907 size_t lens[VIRTQUEUE_MAX_SIZE]; 1908 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; 1909 struct virtio_net_hdr_v1_hash extra_hdr; 1910 unsigned mhdr_cnt = 0; 1911 size_t offset, i, guest_offset, j; 1912 ssize_t err; 1913 1914 memset(&extra_hdr, 0, sizeof(extra_hdr)); 1915 1916 if (n->rss_data.enabled && n->rss_data.enabled_software_rss) { 1917 int index = virtio_net_process_rss(nc, buf, size, &extra_hdr); 1918 if (index >= 0) { 1919 nc = qemu_get_subqueue(n->nic, index % n->curr_queue_pairs); 1920 } 1921 } 1922 1923 if (!virtio_net_can_receive(nc)) { 1924 return -1; 1925 } 1926 1927 q = virtio_net_get_subqueue(nc); 1928 1929 /* hdr_len refers to the header we supply to the guest */ 1930 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { 1931 return 0; 1932 } 1933 1934 if (!receive_filter(n, buf, size)) 1935 return size; 1936 1937 offset = i = 0; 1938 1939 while (offset < size) { 1940 VirtQueueElement *elem; 1941 int len, total; 1942 const struct iovec *sg; 1943 1944 total = 0; 1945 1946 if (i == VIRTQUEUE_MAX_SIZE) { 1947 virtio_error(vdev, "virtio-net unexpected long buffer chain"); 1948 err = size; 1949 goto err; 1950 } 1951 1952 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); 1953 if (!elem) { 1954 if (i) { 1955 virtio_error(vdev, "virtio-net unexpected empty queue: " 1956 "i %zd mergeable %d offset %zd, size %zd, " 1957 "guest hdr len %zd, host hdr len %zd " 1958 "guest features 0x%" PRIx64, 1959 i, n->mergeable_rx_bufs, offset, size, 1960 n->guest_hdr_len, n->host_hdr_len, 1961 vdev->guest_features); 1962 } 1963 err = -1; 1964 goto err; 1965 } 1966 1967 if (elem->in_num < 1) { 1968 virtio_error(vdev, 1969 "virtio-net receive queue contains no in buffers"); 1970 virtqueue_detach_element(q->rx_vq, elem, 0); 1971 g_free(elem); 1972 err = -1; 1973 goto err; 1974 } 1975 1976 sg = elem->in_sg; 1977 if (i == 0) { 1978 assert(offset == 0); 1979 if (n->mergeable_rx_bufs) { 1980 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), 1981 sg, elem->in_num, 1982 offsetof(typeof(extra_hdr), hdr.num_buffers), 1983 sizeof(extra_hdr.hdr.num_buffers)); 1984 } 1985 1986 receive_header(n, sg, elem->in_num, buf, size); 1987 if (n->rss_data.populate_hash) { 1988 offset = offsetof(typeof(extra_hdr), hash_value); 1989 iov_from_buf(sg, elem->in_num, offset, 1990 (char *)&extra_hdr + offset, 1991 sizeof(extra_hdr.hash_value) + 1992 sizeof(extra_hdr.hash_report)); 1993 } 1994 offset = n->host_hdr_len; 1995 total += n->guest_hdr_len; 1996 guest_offset = n->guest_hdr_len; 1997 } else { 1998 guest_offset = 0; 1999 } 2000 2001 /* copy in packet. ugh */ 2002 len = iov_from_buf(sg, elem->in_num, guest_offset, 2003 buf + offset, size - offset); 2004 total += len; 2005 offset += len; 2006 /* If buffers can't be merged, at this point we 2007 * must have consumed the complete packet. 2008 * Otherwise, drop it. */ 2009 if (!n->mergeable_rx_bufs && offset < size) { 2010 virtqueue_unpop(q->rx_vq, elem, total); 2011 g_free(elem); 2012 err = size; 2013 goto err; 2014 } 2015 2016 elems[i] = elem; 2017 lens[i] = total; 2018 i++; 2019 } 2020 2021 if (mhdr_cnt) { 2022 virtio_stw_p(vdev, &extra_hdr.hdr.num_buffers, i); 2023 iov_from_buf(mhdr_sg, mhdr_cnt, 2024 0, 2025 &extra_hdr.hdr.num_buffers, 2026 sizeof extra_hdr.hdr.num_buffers); 2027 } 2028 2029 for (j = 0; j < i; j++) { 2030 /* signal other side */ 2031 virtqueue_fill(q->rx_vq, elems[j], lens[j], j); 2032 g_free(elems[j]); 2033 } 2034 2035 virtqueue_flush(q->rx_vq, i); 2036 virtio_notify(vdev, q->rx_vq); 2037 2038 return size; 2039 2040 err: 2041 for (j = 0; j < i; j++) { 2042 virtqueue_detach_element(q->rx_vq, elems[j], lens[j]); 2043 g_free(elems[j]); 2044 } 2045 2046 return err; 2047 } 2048 2049 static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf, 2050 size_t size) 2051 { 2052 RCU_READ_LOCK_GUARD(); 2053 2054 return virtio_net_receive_rcu(nc, buf, size); 2055 } 2056 2057 /* 2058 * Accessors to read and write the IP packet data length field. This 2059 * is a potentially unaligned network-byte-order 16 bit unsigned integer 2060 * pointed to by unit->ip_len. 2061 */ 2062 static uint16_t read_unit_ip_len(VirtioNetRscUnit *unit) 2063 { 2064 return lduw_be_p(unit->ip_plen); 2065 } 2066 2067 static void write_unit_ip_len(VirtioNetRscUnit *unit, uint16_t l) 2068 { 2069 stw_be_p(unit->ip_plen, l); 2070 } 2071 2072 static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain, 2073 const uint8_t *buf, 2074 VirtioNetRscUnit *unit) 2075 { 2076 uint16_t ip_hdrlen; 2077 struct ip_header *ip; 2078 2079 ip = (struct ip_header *)(buf + chain->n->guest_hdr_len 2080 + sizeof(struct eth_header)); 2081 unit->ip = (void *)ip; 2082 ip_hdrlen = (ip->ip_ver_len & 0xF) << 2; 2083 unit->ip_plen = &ip->ip_len; 2084 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen); 2085 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 2086 unit->payload = read_unit_ip_len(unit) - ip_hdrlen - unit->tcp_hdrlen; 2087 } 2088 2089 static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain, 2090 const uint8_t *buf, 2091 VirtioNetRscUnit *unit) 2092 { 2093 struct ip6_header *ip6; 2094 2095 ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len 2096 + sizeof(struct eth_header)); 2097 unit->ip = ip6; 2098 unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 2099 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) 2100 + sizeof(struct ip6_header)); 2101 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10; 2102 2103 /* There is a difference between payload length in ipv4 and v6, 2104 ip header is excluded in ipv6 */ 2105 unit->payload = read_unit_ip_len(unit) - unit->tcp_hdrlen; 2106 } 2107 2108 static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain, 2109 VirtioNetRscSeg *seg) 2110 { 2111 int ret; 2112 struct virtio_net_hdr_v1 *h; 2113 2114 h = (struct virtio_net_hdr_v1 *)seg->buf; 2115 h->flags = 0; 2116 h->gso_type = VIRTIO_NET_HDR_GSO_NONE; 2117 2118 if (seg->is_coalesced) { 2119 h->rsc.segments = seg->packets; 2120 h->rsc.dup_acks = seg->dup_ack; 2121 h->flags = VIRTIO_NET_HDR_F_RSC_INFO; 2122 if (chain->proto == ETH_P_IP) { 2123 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 2124 } else { 2125 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 2126 } 2127 } 2128 2129 ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size); 2130 QTAILQ_REMOVE(&chain->buffers, seg, next); 2131 g_free(seg->buf); 2132 g_free(seg); 2133 2134 return ret; 2135 } 2136 2137 static void virtio_net_rsc_purge(void *opq) 2138 { 2139 VirtioNetRscSeg *seg, *rn; 2140 VirtioNetRscChain *chain = (VirtioNetRscChain *)opq; 2141 2142 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) { 2143 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2144 chain->stat.purge_failed++; 2145 continue; 2146 } 2147 } 2148 2149 chain->stat.timer++; 2150 if (!QTAILQ_EMPTY(&chain->buffers)) { 2151 timer_mod(chain->drain_timer, 2152 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + chain->n->rsc_timeout); 2153 } 2154 } 2155 2156 static void virtio_net_rsc_cleanup(VirtIONet *n) 2157 { 2158 VirtioNetRscChain *chain, *rn_chain; 2159 VirtioNetRscSeg *seg, *rn_seg; 2160 2161 QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) { 2162 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) { 2163 QTAILQ_REMOVE(&chain->buffers, seg, next); 2164 g_free(seg->buf); 2165 g_free(seg); 2166 } 2167 2168 timer_free(chain->drain_timer); 2169 QTAILQ_REMOVE(&n->rsc_chains, chain, next); 2170 g_free(chain); 2171 } 2172 } 2173 2174 static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain, 2175 NetClientState *nc, 2176 const uint8_t *buf, size_t size) 2177 { 2178 uint16_t hdr_len; 2179 VirtioNetRscSeg *seg; 2180 2181 hdr_len = chain->n->guest_hdr_len; 2182 seg = g_new(VirtioNetRscSeg, 1); 2183 seg->buf = g_malloc(hdr_len + sizeof(struct eth_header) 2184 + sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD); 2185 memcpy(seg->buf, buf, size); 2186 seg->size = size; 2187 seg->packets = 1; 2188 seg->dup_ack = 0; 2189 seg->is_coalesced = 0; 2190 seg->nc = nc; 2191 2192 QTAILQ_INSERT_TAIL(&chain->buffers, seg, next); 2193 chain->stat.cache++; 2194 2195 switch (chain->proto) { 2196 case ETH_P_IP: 2197 virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit); 2198 break; 2199 case ETH_P_IPV6: 2200 virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit); 2201 break; 2202 default: 2203 g_assert_not_reached(); 2204 } 2205 } 2206 2207 static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain, 2208 VirtioNetRscSeg *seg, 2209 const uint8_t *buf, 2210 struct tcp_header *n_tcp, 2211 struct tcp_header *o_tcp) 2212 { 2213 uint32_t nack, oack; 2214 uint16_t nwin, owin; 2215 2216 nack = htonl(n_tcp->th_ack); 2217 nwin = htons(n_tcp->th_win); 2218 oack = htonl(o_tcp->th_ack); 2219 owin = htons(o_tcp->th_win); 2220 2221 if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) { 2222 chain->stat.ack_out_of_win++; 2223 return RSC_FINAL; 2224 } else if (nack == oack) { 2225 /* duplicated ack or window probe */ 2226 if (nwin == owin) { 2227 /* duplicated ack, add dup ack count due to whql test up to 1 */ 2228 chain->stat.dup_ack++; 2229 return RSC_FINAL; 2230 } else { 2231 /* Coalesce window update */ 2232 o_tcp->th_win = n_tcp->th_win; 2233 chain->stat.win_update++; 2234 return RSC_COALESCE; 2235 } 2236 } else { 2237 /* pure ack, go to 'C', finalize*/ 2238 chain->stat.pure_ack++; 2239 return RSC_FINAL; 2240 } 2241 } 2242 2243 static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain, 2244 VirtioNetRscSeg *seg, 2245 const uint8_t *buf, 2246 VirtioNetRscUnit *n_unit) 2247 { 2248 void *data; 2249 uint16_t o_ip_len; 2250 uint32_t nseq, oseq; 2251 VirtioNetRscUnit *o_unit; 2252 2253 o_unit = &seg->unit; 2254 o_ip_len = read_unit_ip_len(o_unit); 2255 nseq = htonl(n_unit->tcp->th_seq); 2256 oseq = htonl(o_unit->tcp->th_seq); 2257 2258 /* out of order or retransmitted. */ 2259 if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) { 2260 chain->stat.data_out_of_win++; 2261 return RSC_FINAL; 2262 } 2263 2264 data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen; 2265 if (nseq == oseq) { 2266 if ((o_unit->payload == 0) && n_unit->payload) { 2267 /* From no payload to payload, normal case, not a dup ack or etc */ 2268 chain->stat.data_after_pure_ack++; 2269 goto coalesce; 2270 } else { 2271 return virtio_net_rsc_handle_ack(chain, seg, buf, 2272 n_unit->tcp, o_unit->tcp); 2273 } 2274 } else if ((nseq - oseq) != o_unit->payload) { 2275 /* Not a consistent packet, out of order */ 2276 chain->stat.data_out_of_order++; 2277 return RSC_FINAL; 2278 } else { 2279 coalesce: 2280 if ((o_ip_len + n_unit->payload) > chain->max_payload) { 2281 chain->stat.over_size++; 2282 return RSC_FINAL; 2283 } 2284 2285 /* Here comes the right data, the payload length in v4/v6 is different, 2286 so use the field value to update and record the new data len */ 2287 o_unit->payload += n_unit->payload; /* update new data len */ 2288 2289 /* update field in ip header */ 2290 write_unit_ip_len(o_unit, o_ip_len + n_unit->payload); 2291 2292 /* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced 2293 for windows guest, while this may change the behavior for linux 2294 guest (only if it uses RSC feature). */ 2295 o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags; 2296 2297 o_unit->tcp->th_ack = n_unit->tcp->th_ack; 2298 o_unit->tcp->th_win = n_unit->tcp->th_win; 2299 2300 memmove(seg->buf + seg->size, data, n_unit->payload); 2301 seg->size += n_unit->payload; 2302 seg->packets++; 2303 chain->stat.coalesced++; 2304 return RSC_COALESCE; 2305 } 2306 } 2307 2308 static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain, 2309 VirtioNetRscSeg *seg, 2310 const uint8_t *buf, size_t size, 2311 VirtioNetRscUnit *unit) 2312 { 2313 struct ip_header *ip1, *ip2; 2314 2315 ip1 = (struct ip_header *)(unit->ip); 2316 ip2 = (struct ip_header *)(seg->unit.ip); 2317 if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst) 2318 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 2319 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 2320 chain->stat.no_match++; 2321 return RSC_NO_MATCH; 2322 } 2323 2324 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 2325 } 2326 2327 static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain, 2328 VirtioNetRscSeg *seg, 2329 const uint8_t *buf, size_t size, 2330 VirtioNetRscUnit *unit) 2331 { 2332 struct ip6_header *ip1, *ip2; 2333 2334 ip1 = (struct ip6_header *)(unit->ip); 2335 ip2 = (struct ip6_header *)(seg->unit.ip); 2336 if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address)) 2337 || memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address)) 2338 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport) 2339 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) { 2340 chain->stat.no_match++; 2341 return RSC_NO_MATCH; 2342 } 2343 2344 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit); 2345 } 2346 2347 /* Packets with 'SYN' should bypass, other flag should be sent after drain 2348 * to prevent out of order */ 2349 static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain, 2350 struct tcp_header *tcp) 2351 { 2352 uint16_t tcp_hdr; 2353 uint16_t tcp_flag; 2354 2355 tcp_flag = htons(tcp->th_offset_flags); 2356 tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10; 2357 tcp_flag &= VIRTIO_NET_TCP_FLAG; 2358 if (tcp_flag & TH_SYN) { 2359 chain->stat.tcp_syn++; 2360 return RSC_BYPASS; 2361 } 2362 2363 if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) { 2364 chain->stat.tcp_ctrl_drain++; 2365 return RSC_FINAL; 2366 } 2367 2368 if (tcp_hdr > sizeof(struct tcp_header)) { 2369 chain->stat.tcp_all_opt++; 2370 return RSC_FINAL; 2371 } 2372 2373 return RSC_CANDIDATE; 2374 } 2375 2376 static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain, 2377 NetClientState *nc, 2378 const uint8_t *buf, size_t size, 2379 VirtioNetRscUnit *unit) 2380 { 2381 int ret; 2382 VirtioNetRscSeg *seg, *nseg; 2383 2384 if (QTAILQ_EMPTY(&chain->buffers)) { 2385 chain->stat.empty_cache++; 2386 virtio_net_rsc_cache_buf(chain, nc, buf, size); 2387 timer_mod(chain->drain_timer, 2388 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + chain->n->rsc_timeout); 2389 return size; 2390 } 2391 2392 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 2393 if (chain->proto == ETH_P_IP) { 2394 ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit); 2395 } else { 2396 ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit); 2397 } 2398 2399 if (ret == RSC_FINAL) { 2400 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2401 /* Send failed */ 2402 chain->stat.final_failed++; 2403 return 0; 2404 } 2405 2406 /* Send current packet */ 2407 return virtio_net_do_receive(nc, buf, size); 2408 } else if (ret == RSC_NO_MATCH) { 2409 continue; 2410 } else { 2411 /* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */ 2412 seg->is_coalesced = 1; 2413 return size; 2414 } 2415 } 2416 2417 chain->stat.no_match_cache++; 2418 virtio_net_rsc_cache_buf(chain, nc, buf, size); 2419 return size; 2420 } 2421 2422 /* Drain a connection data, this is to avoid out of order segments */ 2423 static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain, 2424 NetClientState *nc, 2425 const uint8_t *buf, size_t size, 2426 uint16_t ip_start, uint16_t ip_size, 2427 uint16_t tcp_port) 2428 { 2429 VirtioNetRscSeg *seg, *nseg; 2430 uint32_t ppair1, ppair2; 2431 2432 ppair1 = *(uint32_t *)(buf + tcp_port); 2433 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) { 2434 ppair2 = *(uint32_t *)(seg->buf + tcp_port); 2435 if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size) 2436 || (ppair1 != ppair2)) { 2437 continue; 2438 } 2439 if (virtio_net_rsc_drain_seg(chain, seg) == 0) { 2440 chain->stat.drain_failed++; 2441 } 2442 2443 break; 2444 } 2445 2446 return virtio_net_do_receive(nc, buf, size); 2447 } 2448 2449 static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain, 2450 struct ip_header *ip, 2451 const uint8_t *buf, size_t size) 2452 { 2453 uint16_t ip_len; 2454 2455 /* Not an ipv4 packet */ 2456 if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) { 2457 chain->stat.ip_option++; 2458 return RSC_BYPASS; 2459 } 2460 2461 /* Don't handle packets with ip option */ 2462 if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) { 2463 chain->stat.ip_option++; 2464 return RSC_BYPASS; 2465 } 2466 2467 if (ip->ip_p != IPPROTO_TCP) { 2468 chain->stat.bypass_not_tcp++; 2469 return RSC_BYPASS; 2470 } 2471 2472 /* Don't handle packets with ip fragment */ 2473 if (!(htons(ip->ip_off) & IP_DF)) { 2474 chain->stat.ip_frag++; 2475 return RSC_BYPASS; 2476 } 2477 2478 /* Don't handle packets with ecn flag */ 2479 if (IPTOS_ECN(ip->ip_tos)) { 2480 chain->stat.ip_ecn++; 2481 return RSC_BYPASS; 2482 } 2483 2484 ip_len = htons(ip->ip_len); 2485 if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header)) 2486 || ip_len > (size - chain->n->guest_hdr_len - 2487 sizeof(struct eth_header))) { 2488 chain->stat.ip_hacked++; 2489 return RSC_BYPASS; 2490 } 2491 2492 return RSC_CANDIDATE; 2493 } 2494 2495 static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain, 2496 NetClientState *nc, 2497 const uint8_t *buf, size_t size) 2498 { 2499 int32_t ret; 2500 uint16_t hdr_len; 2501 VirtioNetRscUnit unit; 2502 2503 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 2504 2505 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header) 2506 + sizeof(struct tcp_header))) { 2507 chain->stat.bypass_not_tcp++; 2508 return virtio_net_do_receive(nc, buf, size); 2509 } 2510 2511 virtio_net_rsc_extract_unit4(chain, buf, &unit); 2512 if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size) 2513 != RSC_CANDIDATE) { 2514 return virtio_net_do_receive(nc, buf, size); 2515 } 2516 2517 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 2518 if (ret == RSC_BYPASS) { 2519 return virtio_net_do_receive(nc, buf, size); 2520 } else if (ret == RSC_FINAL) { 2521 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 2522 ((hdr_len + sizeof(struct eth_header)) + 12), 2523 VIRTIO_NET_IP4_ADDR_SIZE, 2524 hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)); 2525 } 2526 2527 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 2528 } 2529 2530 static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain, 2531 struct ip6_header *ip6, 2532 const uint8_t *buf, size_t size) 2533 { 2534 uint16_t ip_len; 2535 2536 if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4) 2537 != IP_HEADER_VERSION_6) { 2538 return RSC_BYPASS; 2539 } 2540 2541 /* Both option and protocol is checked in this */ 2542 if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) { 2543 chain->stat.bypass_not_tcp++; 2544 return RSC_BYPASS; 2545 } 2546 2547 ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen); 2548 if (ip_len < sizeof(struct tcp_header) || 2549 ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header) 2550 - sizeof(struct ip6_header))) { 2551 chain->stat.ip_hacked++; 2552 return RSC_BYPASS; 2553 } 2554 2555 /* Don't handle packets with ecn flag */ 2556 if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) { 2557 chain->stat.ip_ecn++; 2558 return RSC_BYPASS; 2559 } 2560 2561 return RSC_CANDIDATE; 2562 } 2563 2564 static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc, 2565 const uint8_t *buf, size_t size) 2566 { 2567 int32_t ret; 2568 uint16_t hdr_len; 2569 VirtioNetRscChain *chain; 2570 VirtioNetRscUnit unit; 2571 2572 chain = opq; 2573 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len; 2574 2575 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header) 2576 + sizeof(tcp_header))) { 2577 return virtio_net_do_receive(nc, buf, size); 2578 } 2579 2580 virtio_net_rsc_extract_unit6(chain, buf, &unit); 2581 if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain, 2582 unit.ip, buf, size)) { 2583 return virtio_net_do_receive(nc, buf, size); 2584 } 2585 2586 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp); 2587 if (ret == RSC_BYPASS) { 2588 return virtio_net_do_receive(nc, buf, size); 2589 } else if (ret == RSC_FINAL) { 2590 return virtio_net_rsc_drain_flow(chain, nc, buf, size, 2591 ((hdr_len + sizeof(struct eth_header)) + 8), 2592 VIRTIO_NET_IP6_ADDR_SIZE, 2593 hdr_len + sizeof(struct eth_header) 2594 + sizeof(struct ip6_header)); 2595 } 2596 2597 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit); 2598 } 2599 2600 static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n, 2601 NetClientState *nc, 2602 uint16_t proto) 2603 { 2604 VirtioNetRscChain *chain; 2605 2606 if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) { 2607 return NULL; 2608 } 2609 2610 QTAILQ_FOREACH(chain, &n->rsc_chains, next) { 2611 if (chain->proto == proto) { 2612 return chain; 2613 } 2614 } 2615 2616 chain = g_malloc(sizeof(*chain)); 2617 chain->n = n; 2618 chain->proto = proto; 2619 if (proto == (uint16_t)ETH_P_IP) { 2620 chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD; 2621 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 2622 } else { 2623 chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD; 2624 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 2625 } 2626 chain->drain_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 2627 virtio_net_rsc_purge, chain); 2628 memset(&chain->stat, 0, sizeof(chain->stat)); 2629 2630 QTAILQ_INIT(&chain->buffers); 2631 QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next); 2632 2633 return chain; 2634 } 2635 2636 static ssize_t virtio_net_rsc_receive(NetClientState *nc, 2637 const uint8_t *buf, 2638 size_t size) 2639 { 2640 uint16_t proto; 2641 VirtioNetRscChain *chain; 2642 struct eth_header *eth; 2643 VirtIONet *n; 2644 2645 n = qemu_get_nic_opaque(nc); 2646 if (size < (n->host_hdr_len + sizeof(struct eth_header))) { 2647 return virtio_net_do_receive(nc, buf, size); 2648 } 2649 2650 eth = (struct eth_header *)(buf + n->guest_hdr_len); 2651 proto = htons(eth->h_proto); 2652 2653 chain = virtio_net_rsc_lookup_chain(n, nc, proto); 2654 if (chain) { 2655 chain->stat.received++; 2656 if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) { 2657 return virtio_net_rsc_receive4(chain, nc, buf, size); 2658 } else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) { 2659 return virtio_net_rsc_receive6(chain, nc, buf, size); 2660 } 2661 } 2662 return virtio_net_do_receive(nc, buf, size); 2663 } 2664 2665 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, 2666 size_t size) 2667 { 2668 VirtIONet *n = qemu_get_nic_opaque(nc); 2669 if ((n->rsc4_enabled || n->rsc6_enabled)) { 2670 return virtio_net_rsc_receive(nc, buf, size); 2671 } else { 2672 return virtio_net_do_receive(nc, buf, size); 2673 } 2674 } 2675 2676 static int32_t virtio_net_flush_tx(VirtIONetQueue *q); 2677 2678 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) 2679 { 2680 VirtIONet *n = qemu_get_nic_opaque(nc); 2681 VirtIONetQueue *q = virtio_net_get_subqueue(nc); 2682 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2683 int ret; 2684 2685 virtqueue_push(q->tx_vq, q->async_tx.elem, 0); 2686 virtio_notify(vdev, q->tx_vq); 2687 2688 g_free(q->async_tx.elem); 2689 q->async_tx.elem = NULL; 2690 2691 virtio_queue_set_notification(q->tx_vq, 1); 2692 ret = virtio_net_flush_tx(q); 2693 if (ret >= n->tx_burst) { 2694 /* 2695 * the flush has been stopped by tx_burst 2696 * we will not receive notification for the 2697 * remainining part, so re-schedule 2698 */ 2699 virtio_queue_set_notification(q->tx_vq, 0); 2700 if (q->tx_bh) { 2701 replay_bh_schedule_event(q->tx_bh); 2702 } else { 2703 timer_mod(q->tx_timer, 2704 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2705 } 2706 q->tx_waiting = 1; 2707 } 2708 } 2709 2710 /* TX */ 2711 static int32_t virtio_net_flush_tx(VirtIONetQueue *q) 2712 { 2713 VirtIONet *n = q->n; 2714 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2715 VirtQueueElement *elem; 2716 int32_t num_packets = 0; 2717 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); 2718 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2719 return num_packets; 2720 } 2721 2722 if (q->async_tx.elem) { 2723 virtio_queue_set_notification(q->tx_vq, 0); 2724 return num_packets; 2725 } 2726 2727 for (;;) { 2728 ssize_t ret; 2729 unsigned int out_num; 2730 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; 2731 struct virtio_net_hdr vhdr; 2732 2733 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); 2734 if (!elem) { 2735 break; 2736 } 2737 2738 out_num = elem->out_num; 2739 out_sg = elem->out_sg; 2740 if (out_num < 1) { 2741 virtio_error(vdev, "virtio-net header not in first element"); 2742 goto detach; 2743 } 2744 2745 if (n->needs_vnet_hdr_swap) { 2746 if (iov_to_buf(out_sg, out_num, 0, &vhdr, sizeof(vhdr)) < 2747 sizeof(vhdr)) { 2748 virtio_error(vdev, "virtio-net header incorrect"); 2749 goto detach; 2750 } 2751 virtio_net_hdr_swap(vdev, &vhdr); 2752 sg2[0].iov_base = &vhdr; 2753 sg2[0].iov_len = sizeof(vhdr); 2754 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, out_sg, out_num, 2755 sizeof(vhdr), -1); 2756 if (out_num == VIRTQUEUE_MAX_SIZE) { 2757 goto drop; 2758 } 2759 out_num += 1; 2760 out_sg = sg2; 2761 } 2762 /* 2763 * If host wants to see the guest header as is, we can 2764 * pass it on unchanged. Otherwise, copy just the parts 2765 * that host is interested in. 2766 */ 2767 assert(n->host_hdr_len <= n->guest_hdr_len); 2768 if (n->host_hdr_len != n->guest_hdr_len) { 2769 if (iov_size(out_sg, out_num) < n->guest_hdr_len) { 2770 virtio_error(vdev, "virtio-net header is invalid"); 2771 goto detach; 2772 } 2773 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), 2774 out_sg, out_num, 2775 0, n->host_hdr_len); 2776 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, 2777 out_sg, out_num, 2778 n->guest_hdr_len, -1); 2779 out_num = sg_num; 2780 out_sg = sg; 2781 2782 if (out_num < 1) { 2783 virtio_error(vdev, "virtio-net nothing to send"); 2784 goto detach; 2785 } 2786 } 2787 2788 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), 2789 out_sg, out_num, virtio_net_tx_complete); 2790 if (ret == 0) { 2791 virtio_queue_set_notification(q->tx_vq, 0); 2792 q->async_tx.elem = elem; 2793 return -EBUSY; 2794 } 2795 2796 drop: 2797 virtqueue_push(q->tx_vq, elem, 0); 2798 virtio_notify(vdev, q->tx_vq); 2799 g_free(elem); 2800 2801 if (++num_packets >= n->tx_burst) { 2802 break; 2803 } 2804 } 2805 return num_packets; 2806 2807 detach: 2808 virtqueue_detach_element(q->tx_vq, elem, 0); 2809 g_free(elem); 2810 return -EINVAL; 2811 } 2812 2813 static void virtio_net_tx_timer(void *opaque); 2814 2815 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) 2816 { 2817 VirtIONet *n = VIRTIO_NET(vdev); 2818 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2819 2820 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2821 virtio_net_drop_tx_queue_data(vdev, vq); 2822 return; 2823 } 2824 2825 /* This happens when device was stopped but VCPU wasn't. */ 2826 if (!vdev->vm_running) { 2827 q->tx_waiting = 1; 2828 return; 2829 } 2830 2831 if (q->tx_waiting) { 2832 /* We already have queued packets, immediately flush */ 2833 timer_del(q->tx_timer); 2834 virtio_net_tx_timer(q); 2835 } else { 2836 /* re-arm timer to flush it (and more) on next tick */ 2837 timer_mod(q->tx_timer, 2838 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2839 q->tx_waiting = 1; 2840 virtio_queue_set_notification(vq, 0); 2841 } 2842 } 2843 2844 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) 2845 { 2846 VirtIONet *n = VIRTIO_NET(vdev); 2847 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; 2848 2849 if (unlikely(n->vhost_started)) { 2850 return; 2851 } 2852 2853 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { 2854 virtio_net_drop_tx_queue_data(vdev, vq); 2855 return; 2856 } 2857 2858 if (unlikely(q->tx_waiting)) { 2859 return; 2860 } 2861 q->tx_waiting = 1; 2862 /* This happens when device was stopped but VCPU wasn't. */ 2863 if (!vdev->vm_running) { 2864 return; 2865 } 2866 virtio_queue_set_notification(vq, 0); 2867 replay_bh_schedule_event(q->tx_bh); 2868 } 2869 2870 static void virtio_net_tx_timer(void *opaque) 2871 { 2872 VirtIONetQueue *q = opaque; 2873 VirtIONet *n = q->n; 2874 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2875 int ret; 2876 2877 /* This happens when device was stopped but BH wasn't. */ 2878 if (!vdev->vm_running) { 2879 /* Make sure tx waiting is set, so we'll run when restarted. */ 2880 assert(q->tx_waiting); 2881 return; 2882 } 2883 2884 q->tx_waiting = 0; 2885 2886 /* Just in case the driver is not ready on more */ 2887 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 2888 return; 2889 } 2890 2891 ret = virtio_net_flush_tx(q); 2892 if (ret == -EBUSY || ret == -EINVAL) { 2893 return; 2894 } 2895 /* 2896 * If we flush a full burst of packets, assume there are 2897 * more coming and immediately rearm 2898 */ 2899 if (ret >= n->tx_burst) { 2900 q->tx_waiting = 1; 2901 timer_mod(q->tx_timer, 2902 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2903 return; 2904 } 2905 /* 2906 * If less than a full burst, re-enable notification and flush 2907 * anything that may have come in while we weren't looking. If 2908 * we find something, assume the guest is still active and rearm 2909 */ 2910 virtio_queue_set_notification(q->tx_vq, 1); 2911 ret = virtio_net_flush_tx(q); 2912 if (ret > 0) { 2913 virtio_queue_set_notification(q->tx_vq, 0); 2914 q->tx_waiting = 1; 2915 timer_mod(q->tx_timer, 2916 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); 2917 } 2918 } 2919 2920 static void virtio_net_tx_bh(void *opaque) 2921 { 2922 VirtIONetQueue *q = opaque; 2923 VirtIONet *n = q->n; 2924 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2925 int32_t ret; 2926 2927 /* This happens when device was stopped but BH wasn't. */ 2928 if (!vdev->vm_running) { 2929 /* Make sure tx waiting is set, so we'll run when restarted. */ 2930 assert(q->tx_waiting); 2931 return; 2932 } 2933 2934 q->tx_waiting = 0; 2935 2936 /* Just in case the driver is not ready on more */ 2937 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { 2938 return; 2939 } 2940 2941 ret = virtio_net_flush_tx(q); 2942 if (ret == -EBUSY || ret == -EINVAL) { 2943 return; /* Notification re-enable handled by tx_complete or device 2944 * broken */ 2945 } 2946 2947 /* If we flush a full burst of packets, assume there are 2948 * more coming and immediately reschedule */ 2949 if (ret >= n->tx_burst) { 2950 replay_bh_schedule_event(q->tx_bh); 2951 q->tx_waiting = 1; 2952 return; 2953 } 2954 2955 /* If less than a full burst, re-enable notification and flush 2956 * anything that may have come in while we weren't looking. If 2957 * we find something, assume the guest is still active and reschedule */ 2958 virtio_queue_set_notification(q->tx_vq, 1); 2959 ret = virtio_net_flush_tx(q); 2960 if (ret == -EINVAL) { 2961 return; 2962 } else if (ret > 0) { 2963 virtio_queue_set_notification(q->tx_vq, 0); 2964 replay_bh_schedule_event(q->tx_bh); 2965 q->tx_waiting = 1; 2966 } 2967 } 2968 2969 static void virtio_net_add_queue(VirtIONet *n, int index) 2970 { 2971 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2972 2973 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, 2974 virtio_net_handle_rx); 2975 2976 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { 2977 n->vqs[index].tx_vq = 2978 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 2979 virtio_net_handle_tx_timer); 2980 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 2981 virtio_net_tx_timer, 2982 &n->vqs[index]); 2983 } else { 2984 n->vqs[index].tx_vq = 2985 virtio_add_queue(vdev, n->net_conf.tx_queue_size, 2986 virtio_net_handle_tx_bh); 2987 n->vqs[index].tx_bh = qemu_bh_new_guarded(virtio_net_tx_bh, &n->vqs[index], 2988 &DEVICE(vdev)->mem_reentrancy_guard); 2989 } 2990 2991 n->vqs[index].tx_waiting = 0; 2992 n->vqs[index].n = n; 2993 } 2994 2995 static void virtio_net_del_queue(VirtIONet *n, int index) 2996 { 2997 VirtIODevice *vdev = VIRTIO_DEVICE(n); 2998 VirtIONetQueue *q = &n->vqs[index]; 2999 NetClientState *nc = qemu_get_subqueue(n->nic, index); 3000 3001 qemu_purge_queued_packets(nc); 3002 3003 virtio_del_queue(vdev, index * 2); 3004 if (q->tx_timer) { 3005 timer_free(q->tx_timer); 3006 q->tx_timer = NULL; 3007 } else { 3008 qemu_bh_delete(q->tx_bh); 3009 q->tx_bh = NULL; 3010 } 3011 q->tx_waiting = 0; 3012 virtio_del_queue(vdev, index * 2 + 1); 3013 } 3014 3015 static void virtio_net_change_num_queue_pairs(VirtIONet *n, int new_max_queue_pairs) 3016 { 3017 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3018 int old_num_queues = virtio_get_num_queues(vdev); 3019 int new_num_queues = new_max_queue_pairs * 2 + 1; 3020 int i; 3021 3022 assert(old_num_queues >= 3); 3023 assert(old_num_queues % 2 == 1); 3024 3025 if (old_num_queues == new_num_queues) { 3026 return; 3027 } 3028 3029 /* 3030 * We always need to remove and add ctrl vq if 3031 * old_num_queues != new_num_queues. Remove ctrl_vq first, 3032 * and then we only enter one of the following two loops. 3033 */ 3034 virtio_del_queue(vdev, old_num_queues - 1); 3035 3036 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { 3037 /* new_num_queues < old_num_queues */ 3038 virtio_net_del_queue(n, i / 2); 3039 } 3040 3041 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { 3042 /* new_num_queues > old_num_queues */ 3043 virtio_net_add_queue(n, i / 2); 3044 } 3045 3046 /* add ctrl_vq last */ 3047 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 3048 } 3049 3050 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) 3051 { 3052 int max = multiqueue ? n->max_queue_pairs : 1; 3053 3054 n->multiqueue = multiqueue; 3055 virtio_net_change_num_queue_pairs(n, max); 3056 3057 virtio_net_set_queue_pairs(n); 3058 } 3059 3060 static int virtio_net_post_load_device(void *opaque, int version_id) 3061 { 3062 VirtIONet *n = opaque; 3063 VirtIODevice *vdev = VIRTIO_DEVICE(n); 3064 int i, link_down; 3065 3066 trace_virtio_net_post_load_device(); 3067 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, 3068 virtio_vdev_has_feature(vdev, 3069 VIRTIO_F_VERSION_1), 3070 virtio_vdev_has_feature(vdev, 3071 VIRTIO_NET_F_HASH_REPORT)); 3072 3073 /* MAC_TABLE_ENTRIES may be different from the saved image */ 3074 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { 3075 n->mac_table.in_use = 0; 3076 } 3077 3078 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 3079 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); 3080 } 3081 3082 /* 3083 * curr_guest_offloads will be later overwritten by the 3084 * virtio_set_features_nocheck call done from the virtio_load. 3085 * Here we make sure it is preserved and restored accordingly 3086 * in the virtio_net_post_load_virtio callback. 3087 */ 3088 n->saved_guest_offloads = n->curr_guest_offloads; 3089 3090 virtio_net_set_queue_pairs(n); 3091 3092 /* Find the first multicast entry in the saved MAC filter */ 3093 for (i = 0; i < n->mac_table.in_use; i++) { 3094 if (n->mac_table.macs[i * ETH_ALEN] & 1) { 3095 break; 3096 } 3097 } 3098 n->mac_table.first_multi = i; 3099 3100 /* nc.link_down can't be migrated, so infer link_down according 3101 * to link status bit in n->status */ 3102 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; 3103 for (i = 0; i < n->max_queue_pairs; i++) { 3104 qemu_get_subqueue(n->nic, i)->link_down = link_down; 3105 } 3106 3107 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && 3108 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3109 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 3110 QEMU_CLOCK_VIRTUAL, 3111 virtio_net_announce_timer, n); 3112 if (n->announce_timer.round) { 3113 timer_mod(n->announce_timer.tm, 3114 qemu_clock_get_ms(n->announce_timer.type)); 3115 } else { 3116 qemu_announce_timer_del(&n->announce_timer, false); 3117 } 3118 } 3119 3120 virtio_net_commit_rss_config(n); 3121 return 0; 3122 } 3123 3124 static int virtio_net_post_load_virtio(VirtIODevice *vdev) 3125 { 3126 VirtIONet *n = VIRTIO_NET(vdev); 3127 /* 3128 * The actual needed state is now in saved_guest_offloads, 3129 * see virtio_net_post_load_device for detail. 3130 * Restore it back and apply the desired offloads. 3131 */ 3132 n->curr_guest_offloads = n->saved_guest_offloads; 3133 if (peer_has_vnet_hdr(n)) { 3134 virtio_net_apply_guest_offloads(n); 3135 } 3136 3137 return 0; 3138 } 3139 3140 /* tx_waiting field of a VirtIONetQueue */ 3141 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { 3142 .name = "virtio-net-queue-tx_waiting", 3143 .fields = (const VMStateField[]) { 3144 VMSTATE_UINT32(tx_waiting, VirtIONetQueue), 3145 VMSTATE_END_OF_LIST() 3146 }, 3147 }; 3148 3149 static bool max_queue_pairs_gt_1(void *opaque, int version_id) 3150 { 3151 return VIRTIO_NET(opaque)->max_queue_pairs > 1; 3152 } 3153 3154 static bool has_ctrl_guest_offloads(void *opaque, int version_id) 3155 { 3156 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), 3157 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3158 } 3159 3160 static bool mac_table_fits(void *opaque, int version_id) 3161 { 3162 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; 3163 } 3164 3165 static bool mac_table_doesnt_fit(void *opaque, int version_id) 3166 { 3167 return !mac_table_fits(opaque, version_id); 3168 } 3169 3170 /* This temporary type is shared by all the WITH_TMP methods 3171 * although only some fields are used by each. 3172 */ 3173 struct VirtIONetMigTmp { 3174 VirtIONet *parent; 3175 VirtIONetQueue *vqs_1; 3176 uint16_t curr_queue_pairs_1; 3177 uint8_t has_ufo; 3178 uint32_t has_vnet_hdr; 3179 }; 3180 3181 /* The 2nd and subsequent tx_waiting flags are loaded later than 3182 * the 1st entry in the queue_pairs and only if there's more than one 3183 * entry. We use the tmp mechanism to calculate a temporary 3184 * pointer and count and also validate the count. 3185 */ 3186 3187 static int virtio_net_tx_waiting_pre_save(void *opaque) 3188 { 3189 struct VirtIONetMigTmp *tmp = opaque; 3190 3191 tmp->vqs_1 = tmp->parent->vqs + 1; 3192 tmp->curr_queue_pairs_1 = tmp->parent->curr_queue_pairs - 1; 3193 if (tmp->parent->curr_queue_pairs == 0) { 3194 tmp->curr_queue_pairs_1 = 0; 3195 } 3196 3197 return 0; 3198 } 3199 3200 static int virtio_net_tx_waiting_pre_load(void *opaque) 3201 { 3202 struct VirtIONetMigTmp *tmp = opaque; 3203 3204 /* Reuse the pointer setup from save */ 3205 virtio_net_tx_waiting_pre_save(opaque); 3206 3207 if (tmp->parent->curr_queue_pairs > tmp->parent->max_queue_pairs) { 3208 error_report("virtio-net: curr_queue_pairs %x > max_queue_pairs %x", 3209 tmp->parent->curr_queue_pairs, tmp->parent->max_queue_pairs); 3210 3211 return -EINVAL; 3212 } 3213 3214 return 0; /* all good */ 3215 } 3216 3217 static const VMStateDescription vmstate_virtio_net_tx_waiting = { 3218 .name = "virtio-net-tx_waiting", 3219 .pre_load = virtio_net_tx_waiting_pre_load, 3220 .pre_save = virtio_net_tx_waiting_pre_save, 3221 .fields = (const VMStateField[]) { 3222 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, 3223 curr_queue_pairs_1, 3224 vmstate_virtio_net_queue_tx_waiting, 3225 struct VirtIONetQueue), 3226 VMSTATE_END_OF_LIST() 3227 }, 3228 }; 3229 3230 /* the 'has_ufo' flag is just tested; if the incoming stream has the 3231 * flag set we need to check that we have it 3232 */ 3233 static int virtio_net_ufo_post_load(void *opaque, int version_id) 3234 { 3235 struct VirtIONetMigTmp *tmp = opaque; 3236 3237 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { 3238 error_report("virtio-net: saved image requires TUN_F_UFO support"); 3239 return -EINVAL; 3240 } 3241 3242 return 0; 3243 } 3244 3245 static int virtio_net_ufo_pre_save(void *opaque) 3246 { 3247 struct VirtIONetMigTmp *tmp = opaque; 3248 3249 tmp->has_ufo = tmp->parent->has_ufo; 3250 3251 return 0; 3252 } 3253 3254 static const VMStateDescription vmstate_virtio_net_has_ufo = { 3255 .name = "virtio-net-ufo", 3256 .post_load = virtio_net_ufo_post_load, 3257 .pre_save = virtio_net_ufo_pre_save, 3258 .fields = (const VMStateField[]) { 3259 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), 3260 VMSTATE_END_OF_LIST() 3261 }, 3262 }; 3263 3264 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the 3265 * flag set we need to check that we have it 3266 */ 3267 static int virtio_net_vnet_post_load(void *opaque, int version_id) 3268 { 3269 struct VirtIONetMigTmp *tmp = opaque; 3270 3271 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { 3272 error_report("virtio-net: saved image requires vnet_hdr=on"); 3273 return -EINVAL; 3274 } 3275 3276 return 0; 3277 } 3278 3279 static int virtio_net_vnet_pre_save(void *opaque) 3280 { 3281 struct VirtIONetMigTmp *tmp = opaque; 3282 3283 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; 3284 3285 return 0; 3286 } 3287 3288 static const VMStateDescription vmstate_virtio_net_has_vnet = { 3289 .name = "virtio-net-vnet", 3290 .post_load = virtio_net_vnet_post_load, 3291 .pre_save = virtio_net_vnet_pre_save, 3292 .fields = (const VMStateField[]) { 3293 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), 3294 VMSTATE_END_OF_LIST() 3295 }, 3296 }; 3297 3298 static bool virtio_net_rss_needed(void *opaque) 3299 { 3300 return VIRTIO_NET(opaque)->rss_data.enabled; 3301 } 3302 3303 static const VMStateDescription vmstate_virtio_net_rss = { 3304 .name = "virtio-net-device/rss", 3305 .version_id = 1, 3306 .minimum_version_id = 1, 3307 .needed = virtio_net_rss_needed, 3308 .fields = (const VMStateField[]) { 3309 VMSTATE_BOOL(rss_data.enabled, VirtIONet), 3310 VMSTATE_BOOL(rss_data.redirect, VirtIONet), 3311 VMSTATE_BOOL(rss_data.populate_hash, VirtIONet), 3312 VMSTATE_UINT32(rss_data.hash_types, VirtIONet), 3313 VMSTATE_UINT16(rss_data.indirections_len, VirtIONet), 3314 VMSTATE_UINT16(rss_data.default_queue, VirtIONet), 3315 VMSTATE_UINT8_ARRAY(rss_data.key, VirtIONet, 3316 VIRTIO_NET_RSS_MAX_KEY_SIZE), 3317 VMSTATE_VARRAY_UINT16_ALLOC(rss_data.indirections_table, VirtIONet, 3318 rss_data.indirections_len, 0, 3319 vmstate_info_uint16, uint16_t), 3320 VMSTATE_END_OF_LIST() 3321 }, 3322 }; 3323 3324 static const VMStateDescription vmstate_virtio_net_device = { 3325 .name = "virtio-net-device", 3326 .version_id = VIRTIO_NET_VM_VERSION, 3327 .minimum_version_id = VIRTIO_NET_VM_VERSION, 3328 .post_load = virtio_net_post_load_device, 3329 .fields = (const VMStateField[]) { 3330 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), 3331 VMSTATE_STRUCT_POINTER(vqs, VirtIONet, 3332 vmstate_virtio_net_queue_tx_waiting, 3333 VirtIONetQueue), 3334 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), 3335 VMSTATE_UINT16(status, VirtIONet), 3336 VMSTATE_UINT8(promisc, VirtIONet), 3337 VMSTATE_UINT8(allmulti, VirtIONet), 3338 VMSTATE_UINT32(mac_table.in_use, VirtIONet), 3339 3340 /* Guarded pair: If it fits we load it, else we throw it away 3341 * - can happen if source has a larger MAC table.; post-load 3342 * sets flags in this case. 3343 */ 3344 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 3345 0, mac_table_fits, mac_table.in_use, 3346 ETH_ALEN), 3347 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, 3348 mac_table.in_use, ETH_ALEN), 3349 3350 /* Note: This is an array of uint32's that's always been saved as a 3351 * buffer; hold onto your endiannesses; it's actually used as a bitmap 3352 * but based on the uint. 3353 */ 3354 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), 3355 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3356 vmstate_virtio_net_has_vnet), 3357 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), 3358 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), 3359 VMSTATE_UINT8(alluni, VirtIONet), 3360 VMSTATE_UINT8(nomulti, VirtIONet), 3361 VMSTATE_UINT8(nouni, VirtIONet), 3362 VMSTATE_UINT8(nobcast, VirtIONet), 3363 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3364 vmstate_virtio_net_has_ufo), 3365 VMSTATE_SINGLE_TEST(max_queue_pairs, VirtIONet, max_queue_pairs_gt_1, 0, 3366 vmstate_info_uint16_equal, uint16_t), 3367 VMSTATE_UINT16_TEST(curr_queue_pairs, VirtIONet, max_queue_pairs_gt_1), 3368 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, 3369 vmstate_virtio_net_tx_waiting), 3370 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, 3371 has_ctrl_guest_offloads), 3372 VMSTATE_END_OF_LIST() 3373 }, 3374 .subsections = (const VMStateDescription * const []) { 3375 &vmstate_virtio_net_rss, 3376 NULL 3377 } 3378 }; 3379 3380 static NetClientInfo net_virtio_info = { 3381 .type = NET_CLIENT_DRIVER_NIC, 3382 .size = sizeof(NICState), 3383 .can_receive = virtio_net_can_receive, 3384 .receive = virtio_net_receive, 3385 .link_status_changed = virtio_net_set_link_status, 3386 .query_rx_filter = virtio_net_query_rxfilter, 3387 .announce = virtio_net_announce, 3388 }; 3389 3390 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) 3391 { 3392 VirtIONet *n = VIRTIO_NET(vdev); 3393 NetClientState *nc; 3394 assert(n->vhost_started); 3395 if (!n->multiqueue && idx == 2) { 3396 /* Must guard against invalid features and bogus queue index 3397 * from being set by malicious guest, or penetrated through 3398 * buggy migration stream. 3399 */ 3400 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3401 qemu_log_mask(LOG_GUEST_ERROR, 3402 "%s: bogus vq index ignored\n", __func__); 3403 return false; 3404 } 3405 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs); 3406 } else { 3407 nc = qemu_get_subqueue(n->nic, vq2q(idx)); 3408 } 3409 /* 3410 * Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1 3411 * as the macro of configure interrupt's IDX, If this driver does not 3412 * support, the function will return false 3413 */ 3414 3415 if (idx == VIRTIO_CONFIG_IRQ_IDX) { 3416 return vhost_net_config_pending(get_vhost_net(nc->peer)); 3417 } 3418 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); 3419 } 3420 3421 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, 3422 bool mask) 3423 { 3424 VirtIONet *n = VIRTIO_NET(vdev); 3425 NetClientState *nc; 3426 assert(n->vhost_started); 3427 if (!n->multiqueue && idx == 2) { 3428 /* Must guard against invalid features and bogus queue index 3429 * from being set by malicious guest, or penetrated through 3430 * buggy migration stream. 3431 */ 3432 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { 3433 qemu_log_mask(LOG_GUEST_ERROR, 3434 "%s: bogus vq index ignored\n", __func__); 3435 return; 3436 } 3437 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs); 3438 } else { 3439 nc = qemu_get_subqueue(n->nic, vq2q(idx)); 3440 } 3441 /* 3442 *Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1 3443 * as the macro of configure interrupt's IDX, If this driver does not 3444 * support, the function will return 3445 */ 3446 3447 if (idx == VIRTIO_CONFIG_IRQ_IDX) { 3448 vhost_net_config_mask(get_vhost_net(nc->peer), vdev, mask); 3449 return; 3450 } 3451 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask); 3452 } 3453 3454 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) 3455 { 3456 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); 3457 3458 n->config_size = virtio_get_config_size(&cfg_size_params, host_features); 3459 } 3460 3461 void virtio_net_set_netclient_name(VirtIONet *n, const char *name, 3462 const char *type) 3463 { 3464 /* 3465 * The name can be NULL, the netclient name will be type.x. 3466 */ 3467 assert(type != NULL); 3468 3469 g_free(n->netclient_name); 3470 g_free(n->netclient_type); 3471 n->netclient_name = g_strdup(name); 3472 n->netclient_type = g_strdup(type); 3473 } 3474 3475 static bool failover_unplug_primary(VirtIONet *n, DeviceState *dev) 3476 { 3477 HotplugHandler *hotplug_ctrl; 3478 PCIDevice *pci_dev; 3479 Error *err = NULL; 3480 3481 hotplug_ctrl = qdev_get_hotplug_handler(dev); 3482 if (hotplug_ctrl) { 3483 pci_dev = PCI_DEVICE(dev); 3484 pci_dev->partially_hotplugged = true; 3485 hotplug_handler_unplug_request(hotplug_ctrl, dev, &err); 3486 if (err) { 3487 error_report_err(err); 3488 return false; 3489 } 3490 } else { 3491 return false; 3492 } 3493 return true; 3494 } 3495 3496 static bool failover_replug_primary(VirtIONet *n, DeviceState *dev, 3497 Error **errp) 3498 { 3499 Error *err = NULL; 3500 HotplugHandler *hotplug_ctrl; 3501 PCIDevice *pdev = PCI_DEVICE(dev); 3502 BusState *primary_bus; 3503 3504 if (!pdev->partially_hotplugged) { 3505 return true; 3506 } 3507 primary_bus = dev->parent_bus; 3508 if (!primary_bus) { 3509 error_setg(errp, "virtio_net: couldn't find primary bus"); 3510 return false; 3511 } 3512 qdev_set_parent_bus(dev, primary_bus, &error_abort); 3513 qatomic_set(&n->failover_primary_hidden, false); 3514 hotplug_ctrl = qdev_get_hotplug_handler(dev); 3515 if (hotplug_ctrl) { 3516 hotplug_handler_pre_plug(hotplug_ctrl, dev, &err); 3517 if (err) { 3518 goto out; 3519 } 3520 hotplug_handler_plug(hotplug_ctrl, dev, &err); 3521 } 3522 pdev->partially_hotplugged = false; 3523 3524 out: 3525 error_propagate(errp, err); 3526 return !err; 3527 } 3528 3529 static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e) 3530 { 3531 bool should_be_hidden; 3532 Error *err = NULL; 3533 DeviceState *dev = failover_find_primary_device(n); 3534 3535 if (!dev) { 3536 return; 3537 } 3538 3539 should_be_hidden = qatomic_read(&n->failover_primary_hidden); 3540 3541 if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) { 3542 if (failover_unplug_primary(n, dev)) { 3543 vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev); 3544 qapi_event_send_unplug_primary(dev->id); 3545 qatomic_set(&n->failover_primary_hidden, true); 3546 } else { 3547 warn_report("couldn't unplug primary device"); 3548 } 3549 } else if (e->type == MIG_EVENT_PRECOPY_FAILED) { 3550 /* We already unplugged the device let's plug it back */ 3551 if (!failover_replug_primary(n, dev, &err)) { 3552 if (err) { 3553 error_report_err(err); 3554 } 3555 } 3556 } 3557 } 3558 3559 static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier, 3560 MigrationEvent *e, Error **errp) 3561 { 3562 VirtIONet *n = container_of(notifier, VirtIONet, migration_state); 3563 virtio_net_handle_migration_primary(n, e); 3564 return 0; 3565 } 3566 3567 static bool failover_hide_primary_device(DeviceListener *listener, 3568 const QDict *device_opts, 3569 bool from_json, 3570 Error **errp) 3571 { 3572 VirtIONet *n = container_of(listener, VirtIONet, primary_listener); 3573 const char *standby_id; 3574 3575 if (!device_opts) { 3576 return false; 3577 } 3578 3579 if (!qdict_haskey(device_opts, "failover_pair_id")) { 3580 return false; 3581 } 3582 3583 if (!qdict_haskey(device_opts, "id")) { 3584 error_setg(errp, "Device with failover_pair_id needs to have id"); 3585 return false; 3586 } 3587 3588 standby_id = qdict_get_str(device_opts, "failover_pair_id"); 3589 if (g_strcmp0(standby_id, n->netclient_name) != 0) { 3590 return false; 3591 } 3592 3593 /* 3594 * The hide helper can be called several times for a given device. 3595 * Check there is only one primary for a virtio-net device but 3596 * don't duplicate the qdict several times if it's called for the same 3597 * device. 3598 */ 3599 if (n->primary_opts) { 3600 const char *old, *new; 3601 /* devices with failover_pair_id always have an id */ 3602 old = qdict_get_str(n->primary_opts, "id"); 3603 new = qdict_get_str(device_opts, "id"); 3604 if (strcmp(old, new) != 0) { 3605 error_setg(errp, "Cannot attach more than one primary device to " 3606 "'%s': '%s' and '%s'", n->netclient_name, old, new); 3607 return false; 3608 } 3609 } else { 3610 n->primary_opts = qdict_clone_shallow(device_opts); 3611 n->primary_opts_from_json = from_json; 3612 } 3613 3614 /* failover_primary_hidden is set during feature negotiation */ 3615 return qatomic_read(&n->failover_primary_hidden); 3616 } 3617 3618 static void virtio_net_device_realize(DeviceState *dev, Error **errp) 3619 { 3620 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3621 VirtIONet *n = VIRTIO_NET(dev); 3622 NetClientState *nc; 3623 int i; 3624 3625 if (n->net_conf.mtu) { 3626 n->host_features |= (1ULL << VIRTIO_NET_F_MTU); 3627 } 3628 3629 if (n->net_conf.duplex_str) { 3630 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) { 3631 n->net_conf.duplex = DUPLEX_HALF; 3632 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) { 3633 n->net_conf.duplex = DUPLEX_FULL; 3634 } else { 3635 error_setg(errp, "'duplex' must be 'half' or 'full'"); 3636 return; 3637 } 3638 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 3639 } else { 3640 n->net_conf.duplex = DUPLEX_UNKNOWN; 3641 } 3642 3643 if (n->net_conf.speed < SPEED_UNKNOWN) { 3644 error_setg(errp, "'speed' must be between 0 and INT_MAX"); 3645 return; 3646 } 3647 if (n->net_conf.speed >= 0) { 3648 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX); 3649 } 3650 3651 if (n->failover) { 3652 n->primary_listener.hide_device = failover_hide_primary_device; 3653 qatomic_set(&n->failover_primary_hidden, true); 3654 device_listener_register(&n->primary_listener); 3655 migration_add_notifier(&n->migration_state, 3656 virtio_net_migration_state_notifier); 3657 n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY); 3658 } 3659 3660 virtio_net_set_config_size(n, n->host_features); 3661 virtio_init(vdev, VIRTIO_ID_NET, n->config_size); 3662 3663 /* 3664 * We set a lower limit on RX queue size to what it always was. 3665 * Guests that want a smaller ring can always resize it without 3666 * help from us (using virtio 1 and up). 3667 */ 3668 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || 3669 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || 3670 !is_power_of_2(n->net_conf.rx_queue_size)) { 3671 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " 3672 "must be a power of 2 between %d and %d.", 3673 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, 3674 VIRTQUEUE_MAX_SIZE); 3675 virtio_cleanup(vdev); 3676 return; 3677 } 3678 3679 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || 3680 n->net_conf.tx_queue_size > virtio_net_max_tx_queue_size(n) || 3681 !is_power_of_2(n->net_conf.tx_queue_size)) { 3682 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " 3683 "must be a power of 2 between %d and %d", 3684 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, 3685 virtio_net_max_tx_queue_size(n)); 3686 virtio_cleanup(vdev); 3687 return; 3688 } 3689 3690 n->max_ncs = MAX(n->nic_conf.peers.queues, 1); 3691 3692 /* 3693 * Figure out the datapath queue pairs since the backend could 3694 * provide control queue via peers as well. 3695 */ 3696 if (n->nic_conf.peers.queues) { 3697 for (i = 0; i < n->max_ncs; i++) { 3698 if (n->nic_conf.peers.ncs[i]->is_datapath) { 3699 ++n->max_queue_pairs; 3700 } 3701 } 3702 } 3703 n->max_queue_pairs = MAX(n->max_queue_pairs, 1); 3704 3705 if (n->max_queue_pairs * 2 + 1 > VIRTIO_QUEUE_MAX) { 3706 error_setg(errp, "Invalid number of queue pairs (= %" PRIu32 "), " 3707 "must be a positive integer less than %d.", 3708 n->max_queue_pairs, (VIRTIO_QUEUE_MAX - 1) / 2); 3709 virtio_cleanup(vdev); 3710 return; 3711 } 3712 n->vqs = g_new0(VirtIONetQueue, n->max_queue_pairs); 3713 n->curr_queue_pairs = 1; 3714 n->tx_timeout = n->net_conf.txtimer; 3715 3716 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") 3717 && strcmp(n->net_conf.tx, "bh")) { 3718 warn_report("virtio-net: " 3719 "Unknown option tx=%s, valid options: \"timer\" \"bh\"", 3720 n->net_conf.tx); 3721 error_printf("Defaulting to \"bh\""); 3722 } 3723 3724 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), 3725 n->net_conf.tx_queue_size); 3726 3727 virtio_net_add_queue(n, 0); 3728 3729 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); 3730 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); 3731 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); 3732 n->status = VIRTIO_NET_S_LINK_UP; 3733 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(), 3734 QEMU_CLOCK_VIRTUAL, 3735 virtio_net_announce_timer, n); 3736 n->announce_timer.round = 0; 3737 3738 if (n->netclient_type) { 3739 /* 3740 * Happen when virtio_net_set_netclient_name has been called. 3741 */ 3742 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3743 n->netclient_type, n->netclient_name, 3744 &dev->mem_reentrancy_guard, n); 3745 } else { 3746 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, 3747 object_get_typename(OBJECT(dev)), dev->id, 3748 &dev->mem_reentrancy_guard, n); 3749 } 3750 3751 for (i = 0; i < n->max_queue_pairs; i++) { 3752 n->nic->ncs[i].do_not_pad = true; 3753 } 3754 3755 peer_test_vnet_hdr(n); 3756 if (peer_has_vnet_hdr(n)) { 3757 n->host_hdr_len = sizeof(struct virtio_net_hdr); 3758 } else { 3759 n->host_hdr_len = 0; 3760 } 3761 3762 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); 3763 3764 n->vqs[0].tx_waiting = 0; 3765 n->tx_burst = n->net_conf.txburst; 3766 virtio_net_set_mrg_rx_bufs(n, 0, 0, 0); 3767 n->promisc = 1; /* for compatibility */ 3768 3769 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); 3770 3771 n->vlans = g_malloc0(MAX_VLAN >> 3); 3772 3773 nc = qemu_get_queue(n->nic); 3774 nc->rxfilter_notify_enabled = 1; 3775 3776 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { 3777 struct virtio_net_config netcfg = {}; 3778 memcpy(&netcfg.mac, &n->nic_conf.macaddr, ETH_ALEN); 3779 vhost_net_set_config(get_vhost_net(nc->peer), 3780 (uint8_t *)&netcfg, 0, ETH_ALEN, VHOST_SET_CONFIG_TYPE_FRONTEND); 3781 } 3782 QTAILQ_INIT(&n->rsc_chains); 3783 n->qdev = dev; 3784 3785 net_rx_pkt_init(&n->rx_pkt); 3786 3787 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { 3788 Error *err = NULL; 3789 if (!virtio_net_load_ebpf(n, &err)) { 3790 /* 3791 * If user explicitly gave QEMU RSS FDs to use, then 3792 * failing to use them must be considered a fatal 3793 * error. If no RSS FDs were provided, QEMU is trying 3794 * eBPF on a "best effort" basis only, so report a 3795 * warning and allow fallback to software RSS. 3796 */ 3797 if (n->ebpf_rss_fds) { 3798 error_propagate(errp, err); 3799 } else { 3800 warn_report("unable to load eBPF RSS: %s", 3801 error_get_pretty(err)); 3802 error_free(err); 3803 } 3804 } 3805 } 3806 } 3807 3808 static void virtio_net_device_unrealize(DeviceState *dev) 3809 { 3810 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3811 VirtIONet *n = VIRTIO_NET(dev); 3812 int i, max_queue_pairs; 3813 3814 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { 3815 virtio_net_unload_ebpf(n); 3816 } 3817 3818 /* This will stop vhost backend if appropriate. */ 3819 virtio_net_set_status(vdev, 0); 3820 3821 g_free(n->netclient_name); 3822 n->netclient_name = NULL; 3823 g_free(n->netclient_type); 3824 n->netclient_type = NULL; 3825 3826 g_free(n->mac_table.macs); 3827 g_free(n->vlans); 3828 3829 if (n->failover) { 3830 qobject_unref(n->primary_opts); 3831 device_listener_unregister(&n->primary_listener); 3832 migration_remove_notifier(&n->migration_state); 3833 } else { 3834 assert(n->primary_opts == NULL); 3835 } 3836 3837 max_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 3838 for (i = 0; i < max_queue_pairs; i++) { 3839 virtio_net_del_queue(n, i); 3840 } 3841 /* delete also control vq */ 3842 virtio_del_queue(vdev, max_queue_pairs * 2); 3843 qemu_announce_timer_del(&n->announce_timer, false); 3844 g_free(n->vqs); 3845 qemu_del_nic(n->nic); 3846 virtio_net_rsc_cleanup(n); 3847 g_free(n->rss_data.indirections_table); 3848 net_rx_pkt_uninit(n->rx_pkt); 3849 virtio_cleanup(vdev); 3850 } 3851 3852 static void virtio_net_reset(VirtIODevice *vdev) 3853 { 3854 VirtIONet *n = VIRTIO_NET(vdev); 3855 int i; 3856 3857 /* Reset back to compatibility mode */ 3858 n->promisc = 1; 3859 n->allmulti = 0; 3860 n->alluni = 0; 3861 n->nomulti = 0; 3862 n->nouni = 0; 3863 n->nobcast = 0; 3864 /* multiqueue is disabled by default */ 3865 n->curr_queue_pairs = 1; 3866 timer_del(n->announce_timer.tm); 3867 n->announce_timer.round = 0; 3868 n->status &= ~VIRTIO_NET_S_ANNOUNCE; 3869 3870 /* Flush any MAC and VLAN filter table state */ 3871 n->mac_table.in_use = 0; 3872 n->mac_table.first_multi = 0; 3873 n->mac_table.multi_overflow = 0; 3874 n->mac_table.uni_overflow = 0; 3875 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); 3876 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); 3877 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); 3878 memset(n->vlans, 0, MAX_VLAN >> 3); 3879 3880 /* Flush any async TX */ 3881 for (i = 0; i < n->max_queue_pairs; i++) { 3882 flush_or_purge_queued_packets(qemu_get_subqueue(n->nic, i)); 3883 } 3884 3885 virtio_net_disable_rss(n); 3886 } 3887 3888 static void virtio_net_instance_init(Object *obj) 3889 { 3890 VirtIONet *n = VIRTIO_NET(obj); 3891 3892 /* 3893 * The default config_size is sizeof(struct virtio_net_config). 3894 * Can be overridden with virtio_net_set_config_size. 3895 */ 3896 n->config_size = sizeof(struct virtio_net_config); 3897 device_add_bootindex_property(obj, &n->nic_conf.bootindex, 3898 "bootindex", "/ethernet-phy@0", 3899 DEVICE(n)); 3900 3901 ebpf_rss_init(&n->ebpf_rss); 3902 } 3903 3904 static int virtio_net_pre_save(void *opaque) 3905 { 3906 VirtIONet *n = opaque; 3907 3908 /* At this point, backend must be stopped, otherwise 3909 * it might keep writing to memory. */ 3910 assert(!n->vhost_started); 3911 3912 return 0; 3913 } 3914 3915 static bool primary_unplug_pending(void *opaque) 3916 { 3917 DeviceState *dev = opaque; 3918 DeviceState *primary; 3919 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 3920 VirtIONet *n = VIRTIO_NET(vdev); 3921 3922 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 3923 return false; 3924 } 3925 primary = failover_find_primary_device(n); 3926 return primary ? primary->pending_deleted_event : false; 3927 } 3928 3929 static bool dev_unplug_pending(void *opaque) 3930 { 3931 DeviceState *dev = opaque; 3932 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); 3933 3934 return vdc->primary_unplug_pending(dev); 3935 } 3936 3937 static struct vhost_dev *virtio_net_get_vhost(VirtIODevice *vdev) 3938 { 3939 VirtIONet *n = VIRTIO_NET(vdev); 3940 NetClientState *nc; 3941 struct vhost_net *net; 3942 3943 if (!n->nic) { 3944 return NULL; 3945 } 3946 3947 nc = qemu_get_queue(n->nic); 3948 if (!nc) { 3949 return NULL; 3950 } 3951 3952 net = get_vhost_net(nc->peer); 3953 if (!net) { 3954 return NULL; 3955 } 3956 3957 return &net->dev; 3958 } 3959 3960 static const VMStateDescription vmstate_virtio_net = { 3961 .name = "virtio-net", 3962 .minimum_version_id = VIRTIO_NET_VM_VERSION, 3963 .version_id = VIRTIO_NET_VM_VERSION, 3964 .fields = (const VMStateField[]) { 3965 VMSTATE_VIRTIO_DEVICE, 3966 VMSTATE_END_OF_LIST() 3967 }, 3968 .pre_save = virtio_net_pre_save, 3969 .dev_unplug_pending = dev_unplug_pending, 3970 }; 3971 3972 static Property virtio_net_properties[] = { 3973 DEFINE_PROP_BIT64("csum", VirtIONet, host_features, 3974 VIRTIO_NET_F_CSUM, true), 3975 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features, 3976 VIRTIO_NET_F_GUEST_CSUM, true), 3977 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), 3978 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features, 3979 VIRTIO_NET_F_GUEST_TSO4, true), 3980 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features, 3981 VIRTIO_NET_F_GUEST_TSO6, true), 3982 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features, 3983 VIRTIO_NET_F_GUEST_ECN, true), 3984 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features, 3985 VIRTIO_NET_F_GUEST_UFO, true), 3986 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features, 3987 VIRTIO_NET_F_GUEST_ANNOUNCE, true), 3988 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features, 3989 VIRTIO_NET_F_HOST_TSO4, true), 3990 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features, 3991 VIRTIO_NET_F_HOST_TSO6, true), 3992 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features, 3993 VIRTIO_NET_F_HOST_ECN, true), 3994 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features, 3995 VIRTIO_NET_F_HOST_UFO, true), 3996 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features, 3997 VIRTIO_NET_F_MRG_RXBUF, true), 3998 DEFINE_PROP_BIT64("status", VirtIONet, host_features, 3999 VIRTIO_NET_F_STATUS, true), 4000 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features, 4001 VIRTIO_NET_F_CTRL_VQ, true), 4002 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features, 4003 VIRTIO_NET_F_CTRL_RX, true), 4004 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features, 4005 VIRTIO_NET_F_CTRL_VLAN, true), 4006 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features, 4007 VIRTIO_NET_F_CTRL_RX_EXTRA, true), 4008 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features, 4009 VIRTIO_NET_F_CTRL_MAC_ADDR, true), 4010 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features, 4011 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), 4012 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), 4013 DEFINE_PROP_BIT64("rss", VirtIONet, host_features, 4014 VIRTIO_NET_F_RSS, false), 4015 DEFINE_PROP_BIT64("hash", VirtIONet, host_features, 4016 VIRTIO_NET_F_HASH_REPORT, false), 4017 DEFINE_PROP_ARRAY("ebpf-rss-fds", VirtIONet, nr_ebpf_rss_fds, 4018 ebpf_rss_fds, qdev_prop_string, char*), 4019 DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features, 4020 VIRTIO_NET_F_RSC_EXT, false), 4021 DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout, 4022 VIRTIO_NET_RSC_DEFAULT_INTERVAL), 4023 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), 4024 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, 4025 TX_TIMER_INTERVAL), 4026 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), 4027 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), 4028 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, 4029 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), 4030 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, 4031 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), 4032 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), 4033 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, 4034 true), 4035 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN), 4036 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str), 4037 DEFINE_PROP_BOOL("failover", VirtIONet, failover, false), 4038 DEFINE_PROP_BIT64("guest_uso4", VirtIONet, host_features, 4039 VIRTIO_NET_F_GUEST_USO4, true), 4040 DEFINE_PROP_BIT64("guest_uso6", VirtIONet, host_features, 4041 VIRTIO_NET_F_GUEST_USO6, true), 4042 DEFINE_PROP_BIT64("host_uso", VirtIONet, host_features, 4043 VIRTIO_NET_F_HOST_USO, true), 4044 DEFINE_PROP_END_OF_LIST(), 4045 }; 4046 4047 static void virtio_net_class_init(ObjectClass *klass, void *data) 4048 { 4049 DeviceClass *dc = DEVICE_CLASS(klass); 4050 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 4051 4052 device_class_set_props(dc, virtio_net_properties); 4053 dc->vmsd = &vmstate_virtio_net; 4054 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 4055 vdc->realize = virtio_net_device_realize; 4056 vdc->unrealize = virtio_net_device_unrealize; 4057 vdc->get_config = virtio_net_get_config; 4058 vdc->set_config = virtio_net_set_config; 4059 vdc->get_features = virtio_net_get_features; 4060 vdc->set_features = virtio_net_set_features; 4061 vdc->bad_features = virtio_net_bad_features; 4062 vdc->reset = virtio_net_reset; 4063 vdc->queue_reset = virtio_net_queue_reset; 4064 vdc->queue_enable = virtio_net_queue_enable; 4065 vdc->set_status = virtio_net_set_status; 4066 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; 4067 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; 4068 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); 4069 vdc->post_load = virtio_net_post_load_virtio; 4070 vdc->vmsd = &vmstate_virtio_net_device; 4071 vdc->primary_unplug_pending = primary_unplug_pending; 4072 vdc->get_vhost = virtio_net_get_vhost; 4073 vdc->toggle_device_iotlb = vhost_toggle_device_iotlb; 4074 } 4075 4076 static const TypeInfo virtio_net_info = { 4077 .name = TYPE_VIRTIO_NET, 4078 .parent = TYPE_VIRTIO_DEVICE, 4079 .instance_size = sizeof(VirtIONet), 4080 .instance_init = virtio_net_instance_init, 4081 .class_init = virtio_net_class_init, 4082 }; 4083 4084 static void virtio_register_types(void) 4085 { 4086 type_register_static(&virtio_net_info); 4087 } 4088 4089 type_init(virtio_register_types) 4090