1 /*- 2 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* Driver for VirtIO network devices. */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/eventhandler.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/sockio.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/socket.h> 41 #include <sys/sysctl.h> 42 #include <sys/random.h> 43 #include <sys/sglist.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/taskqueue.h> 47 #include <sys/smp.h> 48 #include <machine/smp.h> 49 50 #include <vm/uma.h> 51 52 #include <net/ethernet.h> 53 #include <net/if.h> 54 #include <net/if_var.h> 55 #include <net/if_arp.h> 56 #include <net/if_dl.h> 57 #include <net/if_types.h> 58 #include <net/if_media.h> 59 #include <net/if_vlan_var.h> 60 61 #include <net/bpf.h> 62 63 #include <netinet/in_systm.h> 64 #include <netinet/in.h> 65 #include <netinet/ip.h> 66 #include <netinet/ip6.h> 67 #include <netinet6/ip6_var.h> 68 #include <netinet/udp.h> 69 #include <netinet/tcp.h> 70 #include <netinet/sctp.h> 71 72 #include <machine/bus.h> 73 #include <machine/resource.h> 74 #include <sys/bus.h> 75 #include <sys/rman.h> 76 77 #include <dev/virtio/virtio.h> 78 #include <dev/virtio/virtqueue.h> 79 #include <dev/virtio/network/virtio_net.h> 80 #include <dev/virtio/network/if_vtnetvar.h> 81 82 #include "virtio_if.h" 83 84 #include "opt_inet.h" 85 #include "opt_inet6.h" 86 87 static int vtnet_modevent(module_t, int, void *); 88 89 static int vtnet_probe(device_t); 90 static int vtnet_attach(device_t); 91 static int vtnet_detach(device_t); 92 static int vtnet_suspend(device_t); 93 static int vtnet_resume(device_t); 94 static int vtnet_shutdown(device_t); 95 static int vtnet_attach_completed(device_t); 96 static int vtnet_config_change(device_t); 97 98 static void vtnet_negotiate_features(struct vtnet_softc *); 99 static void vtnet_setup_features(struct vtnet_softc *); 100 static int vtnet_init_rxq(struct vtnet_softc *, int); 101 static int vtnet_init_txq(struct vtnet_softc *, int); 102 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 103 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 104 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 105 static void vtnet_free_rx_filters(struct vtnet_softc *); 106 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 107 static int vtnet_setup_interface(struct vtnet_softc *); 108 static int vtnet_change_mtu(struct vtnet_softc *, int); 109 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 110 111 static int vtnet_rxq_populate(struct vtnet_rxq *); 112 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 113 static struct mbuf * 114 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 115 static int vtnet_rxq_replace_lro_nomgr_buf(struct vtnet_rxq *, 116 struct mbuf *, int); 117 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 118 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 119 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 120 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 121 struct virtio_net_hdr *); 122 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 123 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 124 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 125 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 126 struct virtio_net_hdr *); 127 static int vtnet_rxq_eof(struct vtnet_rxq *); 128 static void vtnet_rx_vq_intr(void *); 129 static void vtnet_rxq_tq_intr(void *, int); 130 131 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 132 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 133 int *, int *, int *); 134 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 135 int, struct virtio_net_hdr *); 136 static struct mbuf * 137 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 138 struct virtio_net_hdr *); 139 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 140 struct vtnet_tx_header *); 141 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **); 142 #ifdef VTNET_LEGACY_TX 143 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 144 static void vtnet_start(struct ifnet *); 145 #else 146 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 147 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 148 static void vtnet_txq_tq_deferred(void *, int); 149 #endif 150 static void vtnet_txq_start(struct vtnet_txq *); 151 static void vtnet_txq_tq_intr(void *, int); 152 static void vtnet_txq_eof(struct vtnet_txq *); 153 static void vtnet_tx_vq_intr(void *); 154 static void vtnet_tx_start_all(struct vtnet_softc *); 155 156 #ifndef VTNET_LEGACY_TX 157 static void vtnet_qflush(struct ifnet *); 158 #endif 159 160 static int vtnet_watchdog(struct vtnet_txq *); 161 static void vtnet_rxq_accum_stats(struct vtnet_rxq *, 162 struct vtnet_rxq_stats *); 163 static void vtnet_txq_accum_stats(struct vtnet_txq *, 164 struct vtnet_txq_stats *); 165 static void vtnet_accumulate_stats(struct vtnet_softc *); 166 static void vtnet_tick(void *); 167 168 static void vtnet_start_taskqueues(struct vtnet_softc *); 169 static void vtnet_free_taskqueues(struct vtnet_softc *); 170 static void vtnet_drain_taskqueues(struct vtnet_softc *); 171 172 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 173 static void vtnet_stop_rendezvous(struct vtnet_softc *); 174 static void vtnet_stop(struct vtnet_softc *); 175 static int vtnet_virtio_reinit(struct vtnet_softc *); 176 static void vtnet_init_rx_filters(struct vtnet_softc *); 177 static int vtnet_init_rx_queues(struct vtnet_softc *); 178 static int vtnet_init_tx_queues(struct vtnet_softc *); 179 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 180 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 181 static int vtnet_reinit(struct vtnet_softc *); 182 static void vtnet_init_locked(struct vtnet_softc *); 183 static void vtnet_init(void *); 184 185 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 186 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 187 struct sglist *, int, int); 188 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 189 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 190 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int); 191 static int vtnet_set_promisc(struct vtnet_softc *, int); 192 static int vtnet_set_allmulti(struct vtnet_softc *, int); 193 static void vtnet_attach_disable_promisc(struct vtnet_softc *); 194 static void vtnet_rx_filter(struct vtnet_softc *); 195 static void vtnet_rx_filter_mac(struct vtnet_softc *); 196 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 197 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 198 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 199 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 200 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 201 202 static int vtnet_is_link_up(struct vtnet_softc *); 203 static void vtnet_update_link_status(struct vtnet_softc *); 204 static int vtnet_ifmedia_upd(struct ifnet *); 205 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 206 static void vtnet_get_hwaddr(struct vtnet_softc *); 207 static void vtnet_set_hwaddr(struct vtnet_softc *); 208 static void vtnet_vlan_tag_remove(struct mbuf *); 209 210 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 211 struct sysctl_oid_list *, struct vtnet_rxq *); 212 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 213 struct sysctl_oid_list *, struct vtnet_txq *); 214 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 215 static void vtnet_setup_sysctl(struct vtnet_softc *); 216 217 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 218 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 219 static int vtnet_txq_enable_intr(struct vtnet_txq *); 220 static void vtnet_txq_disable_intr(struct vtnet_txq *); 221 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 222 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 223 static void vtnet_enable_interrupts(struct vtnet_softc *); 224 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 225 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 226 static void vtnet_disable_interrupts(struct vtnet_softc *); 227 228 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 229 230 /* Tunables. */ 231 static int vtnet_csum_disable = 0; 232 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable); 233 static int vtnet_tso_disable = 0; 234 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable); 235 static int vtnet_lro_disable = 0; 236 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable); 237 static int vtnet_mq_disable = 0; 238 TUNABLE_INT("hw.vtnet.mq_disable", &vtnet_mq_disable); 239 static int vtnet_mq_max_pairs = 0; 240 TUNABLE_INT("hw.vtnet.mq_max_pairs", &vtnet_mq_max_pairs); 241 static int vtnet_rx_process_limit = 512; 242 TUNABLE_INT("hw.vtnet.rx_process_limit", &vtnet_rx_process_limit); 243 244 /* 245 * Reducing the number of transmit completed interrupts can improve 246 * performance. To do so, the define below keeps the Tx vq interrupt 247 * disabled and adds calls to vtnet_txeof() in the start and watchdog 248 * paths. The price to pay for this is the m_free'ing of transmitted 249 * mbufs may be delayed until the watchdog fires. 250 * 251 * BMV: Reintroduce this later as a run-time option, if it makes 252 * sense after the EVENT_IDX feature is supported. 253 * 254 * #define VTNET_TX_INTR_MODERATION 255 */ 256 257 static uma_zone_t vtnet_tx_header_zone; 258 259 static struct virtio_feature_desc vtnet_feature_desc[] = { 260 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 261 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 262 { VIRTIO_NET_F_MAC, "MacAddress" }, 263 { VIRTIO_NET_F_GSO, "TxAllGSO" }, 264 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" }, 265 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" }, 266 { VIRTIO_NET_F_GUEST_ECN, "RxECN" }, 267 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 268 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 269 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 270 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 271 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 272 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 273 { VIRTIO_NET_F_STATUS, "Status" }, 274 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" }, 275 { VIRTIO_NET_F_CTRL_RX, "RxMode" }, 276 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" }, 277 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" }, 278 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 279 { VIRTIO_NET_F_MQ, "Multiqueue" }, 280 { VIRTIO_NET_F_CTRL_MAC_ADDR, "SetMacAddress" }, 281 282 { 0, NULL } 283 }; 284 285 static device_method_t vtnet_methods[] = { 286 /* Device methods. */ 287 DEVMETHOD(device_probe, vtnet_probe), 288 DEVMETHOD(device_attach, vtnet_attach), 289 DEVMETHOD(device_detach, vtnet_detach), 290 DEVMETHOD(device_suspend, vtnet_suspend), 291 DEVMETHOD(device_resume, vtnet_resume), 292 DEVMETHOD(device_shutdown, vtnet_shutdown), 293 294 /* VirtIO methods. */ 295 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 296 DEVMETHOD(virtio_config_change, vtnet_config_change), 297 298 DEVMETHOD_END 299 }; 300 301 static driver_t vtnet_driver = { 302 "vtnet", 303 vtnet_methods, 304 sizeof(struct vtnet_softc) 305 }; 306 static devclass_t vtnet_devclass; 307 308 DRIVER_MODULE(vtnet, virtio_pci, vtnet_driver, vtnet_devclass, 309 vtnet_modevent, 0); 310 MODULE_VERSION(vtnet, 1); 311 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 312 313 static int 314 vtnet_modevent(module_t mod, int type, void *unused) 315 { 316 int error; 317 318 error = 0; 319 320 switch (type) { 321 case MOD_LOAD: 322 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 323 sizeof(struct vtnet_tx_header), 324 NULL, NULL, NULL, NULL, 0, 0); 325 break; 326 case MOD_QUIESCE: 327 case MOD_UNLOAD: 328 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 329 error = EBUSY; 330 else if (type == MOD_UNLOAD) { 331 uma_zdestroy(vtnet_tx_header_zone); 332 vtnet_tx_header_zone = NULL; 333 } 334 break; 335 case MOD_SHUTDOWN: 336 break; 337 default: 338 error = EOPNOTSUPP; 339 break; 340 } 341 342 return (error); 343 } 344 345 static int 346 vtnet_probe(device_t dev) 347 { 348 349 if (virtio_get_device_type(dev) != VIRTIO_ID_NETWORK) 350 return (ENXIO); 351 352 device_set_desc(dev, "VirtIO Networking Adapter"); 353 354 return (BUS_PROBE_DEFAULT); 355 } 356 357 static int 358 vtnet_attach(device_t dev) 359 { 360 struct vtnet_softc *sc; 361 int error; 362 363 sc = device_get_softc(dev); 364 sc->vtnet_dev = dev; 365 366 /* Register our feature descriptions. */ 367 virtio_set_feature_desc(dev, vtnet_feature_desc); 368 369 VTNET_CORE_LOCK_INIT(sc); 370 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 371 372 vtnet_setup_sysctl(sc); 373 vtnet_setup_features(sc); 374 375 error = vtnet_alloc_rx_filters(sc); 376 if (error) { 377 device_printf(dev, "cannot allocate Rx filters\n"); 378 goto fail; 379 } 380 381 error = vtnet_alloc_rxtx_queues(sc); 382 if (error) { 383 device_printf(dev, "cannot allocate queues\n"); 384 goto fail; 385 } 386 387 error = vtnet_alloc_virtqueues(sc); 388 if (error) { 389 device_printf(dev, "cannot allocate virtqueues\n"); 390 goto fail; 391 } 392 393 error = vtnet_setup_interface(sc); 394 if (error) { 395 device_printf(dev, "cannot setup interface\n"); 396 goto fail; 397 } 398 399 error = virtio_setup_intr(dev, INTR_TYPE_NET); 400 if (error) { 401 device_printf(dev, "cannot setup virtqueue interrupts\n"); 402 /* BMV: This will crash if during boot! */ 403 ether_ifdetach(sc->vtnet_ifp); 404 goto fail; 405 } 406 407 vtnet_start_taskqueues(sc); 408 409 fail: 410 if (error) 411 vtnet_detach(dev); 412 413 return (error); 414 } 415 416 static int 417 vtnet_detach(device_t dev) 418 { 419 struct vtnet_softc *sc; 420 struct ifnet *ifp; 421 422 sc = device_get_softc(dev); 423 ifp = sc->vtnet_ifp; 424 425 if (device_is_attached(dev)) { 426 VTNET_CORE_LOCK(sc); 427 vtnet_stop(sc); 428 VTNET_CORE_UNLOCK(sc); 429 430 callout_drain(&sc->vtnet_tick_ch); 431 vtnet_drain_taskqueues(sc); 432 433 ether_ifdetach(ifp); 434 } 435 436 vtnet_free_taskqueues(sc); 437 438 if (sc->vtnet_vlan_attach != NULL) { 439 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 440 sc->vtnet_vlan_attach = NULL; 441 } 442 if (sc->vtnet_vlan_detach != NULL) { 443 EVENTHANDLER_DEREGISTER(vlan_unconfg, sc->vtnet_vlan_detach); 444 sc->vtnet_vlan_detach = NULL; 445 } 446 447 ifmedia_removeall(&sc->vtnet_media); 448 449 if (ifp != NULL) { 450 if_free(ifp); 451 sc->vtnet_ifp = NULL; 452 } 453 454 vtnet_free_rxtx_queues(sc); 455 vtnet_free_rx_filters(sc); 456 457 if (sc->vtnet_ctrl_vq != NULL) 458 vtnet_free_ctrl_vq(sc); 459 460 VTNET_CORE_LOCK_DESTROY(sc); 461 462 return (0); 463 } 464 465 static int 466 vtnet_suspend(device_t dev) 467 { 468 struct vtnet_softc *sc; 469 470 sc = device_get_softc(dev); 471 472 VTNET_CORE_LOCK(sc); 473 vtnet_stop(sc); 474 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 475 VTNET_CORE_UNLOCK(sc); 476 477 return (0); 478 } 479 480 static int 481 vtnet_resume(device_t dev) 482 { 483 struct vtnet_softc *sc; 484 struct ifnet *ifp; 485 486 sc = device_get_softc(dev); 487 ifp = sc->vtnet_ifp; 488 489 VTNET_CORE_LOCK(sc); 490 if (ifp->if_flags & IFF_UP) 491 vtnet_init_locked(sc); 492 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 493 VTNET_CORE_UNLOCK(sc); 494 495 return (0); 496 } 497 498 static int 499 vtnet_shutdown(device_t dev) 500 { 501 502 /* 503 * Suspend already does all of what we need to 504 * do here; we just never expect to be resumed. 505 */ 506 return (vtnet_suspend(dev)); 507 } 508 509 static int 510 vtnet_attach_completed(device_t dev) 511 { 512 513 vtnet_attach_disable_promisc(device_get_softc(dev)); 514 515 return (0); 516 } 517 518 static int 519 vtnet_config_change(device_t dev) 520 { 521 struct vtnet_softc *sc; 522 523 sc = device_get_softc(dev); 524 525 VTNET_CORE_LOCK(sc); 526 vtnet_update_link_status(sc); 527 if (sc->vtnet_link_active != 0) 528 vtnet_tx_start_all(sc); 529 VTNET_CORE_UNLOCK(sc); 530 531 return (0); 532 } 533 534 static void 535 vtnet_negotiate_features(struct vtnet_softc *sc) 536 { 537 device_t dev; 538 uint64_t mask, features; 539 540 dev = sc->vtnet_dev; 541 mask = 0; 542 543 /* 544 * TSO and LRO are only available when their corresponding checksum 545 * offload feature is also negotiated. 546 */ 547 if (vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable)) { 548 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM; 549 mask |= VTNET_TSO_FEATURES | VTNET_LRO_FEATURES; 550 } 551 if (vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 552 mask |= VTNET_TSO_FEATURES; 553 if (vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 554 mask |= VTNET_LRO_FEATURES; 555 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 556 mask |= VIRTIO_NET_F_MQ; 557 #ifdef VTNET_LEGACY_TX 558 mask |= VIRTIO_NET_F_MQ; 559 #endif 560 561 features = VTNET_FEATURES & ~mask; 562 sc->vtnet_features = virtio_negotiate_features(dev, features); 563 564 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) == 0) 565 return; 566 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) 567 return; 568 569 /* 570 * LRO without mergeable buffers requires special care. This is not 571 * ideal because every receive buffer must be large enough to hold 572 * the maximum TCP packet, the Ethernet header, and the header. This 573 * requires up to 34 descriptors with MCLBYTES clusters. If we do 574 * not have indirect descriptors, LRO is disabled since the virtqueue 575 * will not contain very many receive buffers. 576 */ 577 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC) == 0) { 578 device_printf(dev, 579 "LRO disabled due to both mergeable buffers and indirect " 580 "descriptors not negotiated\n"); 581 582 features &= ~VTNET_LRO_FEATURES; 583 sc->vtnet_features = virtio_negotiate_features(dev, features); 584 } else 585 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 586 } 587 588 static void 589 vtnet_setup_features(struct vtnet_softc *sc) 590 { 591 device_t dev; 592 int max_pairs, max; 593 594 dev = sc->vtnet_dev; 595 596 vtnet_negotiate_features(sc); 597 598 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 599 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 600 601 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 602 /* This feature should always be negotiated. */ 603 sc->vtnet_flags |= VTNET_FLAG_MAC; 604 } 605 606 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 607 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 608 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 609 } else 610 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 611 612 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 613 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 614 615 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 616 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 617 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 618 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 619 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 620 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 621 } 622 623 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ) && 624 sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 625 max_pairs = virtio_read_dev_config_2(dev, 626 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 627 if (max_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 628 max_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) 629 max_pairs = 1; 630 } else 631 max_pairs = 1; 632 633 if (max_pairs > 1) { 634 /* 635 * Limit the maximum number of queue pairs to the number of 636 * CPUs or the configured maximum. The actual number of 637 * queues that get used may be less. 638 */ 639 max = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 640 if (max > 0 && max_pairs > max) 641 max_pairs = max; 642 if (max_pairs > mp_ncpus) 643 max_pairs = mp_ncpus; 644 if (max_pairs > VTNET_MAX_QUEUE_PAIRS) 645 max_pairs = VTNET_MAX_QUEUE_PAIRS; 646 if (max_pairs > 1) 647 sc->vtnet_flags |= VTNET_FLAG_MULTIQ; 648 } 649 650 sc->vtnet_max_vq_pairs = max_pairs; 651 } 652 653 static int 654 vtnet_init_rxq(struct vtnet_softc *sc, int id) 655 { 656 struct vtnet_rxq *rxq; 657 658 rxq = &sc->vtnet_rxqs[id]; 659 660 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 661 device_get_nameunit(sc->vtnet_dev), id); 662 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 663 664 rxq->vtnrx_sc = sc; 665 rxq->vtnrx_id = id; 666 667 TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 668 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 669 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 670 671 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 672 } 673 674 static int 675 vtnet_init_txq(struct vtnet_softc *sc, int id) 676 { 677 struct vtnet_txq *txq; 678 679 txq = &sc->vtnet_txqs[id]; 680 681 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 682 device_get_nameunit(sc->vtnet_dev), id); 683 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 684 685 txq->vtntx_sc = sc; 686 txq->vtntx_id = id; 687 688 #ifndef VTNET_LEGACY_TX 689 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 690 M_NOWAIT, &txq->vtntx_mtx); 691 if (txq->vtntx_br == NULL) 692 return (ENOMEM); 693 694 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 695 #endif 696 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 697 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 698 taskqueue_thread_enqueue, &txq->vtntx_tq); 699 if (txq->vtntx_tq == NULL) 700 return (ENOMEM); 701 702 return (0); 703 } 704 705 static int 706 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 707 { 708 int i, npairs, error; 709 710 npairs = sc->vtnet_max_vq_pairs; 711 712 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 713 M_NOWAIT | M_ZERO); 714 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 715 M_NOWAIT | M_ZERO); 716 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 717 return (ENOMEM); 718 719 for (i = 0; i < npairs; i++) { 720 error = vtnet_init_rxq(sc, i); 721 if (error) 722 return (error); 723 error = vtnet_init_txq(sc, i); 724 if (error) 725 return (error); 726 } 727 728 vtnet_setup_queue_sysctl(sc); 729 730 return (0); 731 } 732 733 static void 734 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 735 { 736 737 rxq->vtnrx_sc = NULL; 738 rxq->vtnrx_id = -1; 739 740 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 741 mtx_destroy(&rxq->vtnrx_mtx); 742 } 743 744 static void 745 vtnet_destroy_txq(struct vtnet_txq *txq) 746 { 747 748 txq->vtntx_sc = NULL; 749 txq->vtntx_id = -1; 750 751 #ifndef VTNET_LEGACY_TX 752 if (txq->vtntx_br != NULL) { 753 buf_ring_free(txq->vtntx_br, M_DEVBUF); 754 txq->vtntx_br = NULL; 755 } 756 #endif 757 758 if (mtx_initialized(&txq->vtntx_mtx) != 0) 759 mtx_destroy(&txq->vtntx_mtx); 760 } 761 762 static void 763 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 764 { 765 int i; 766 767 if (sc->vtnet_rxqs != NULL) { 768 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 769 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 770 free(sc->vtnet_rxqs, M_DEVBUF); 771 sc->vtnet_rxqs = NULL; 772 } 773 774 if (sc->vtnet_txqs != NULL) { 775 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 776 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 777 free(sc->vtnet_txqs, M_DEVBUF); 778 sc->vtnet_txqs = NULL; 779 } 780 } 781 782 static int 783 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 784 { 785 786 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 787 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 788 M_DEVBUF, M_NOWAIT | M_ZERO); 789 if (sc->vtnet_mac_filter == NULL) 790 return (ENOMEM); 791 } 792 793 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 794 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 795 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 796 if (sc->vtnet_vlan_filter == NULL) 797 return (ENOMEM); 798 } 799 800 return (0); 801 } 802 803 static void 804 vtnet_free_rx_filters(struct vtnet_softc *sc) 805 { 806 807 if (sc->vtnet_mac_filter != NULL) { 808 free(sc->vtnet_mac_filter, M_DEVBUF); 809 sc->vtnet_mac_filter = NULL; 810 } 811 812 if (sc->vtnet_vlan_filter != NULL) { 813 free(sc->vtnet_vlan_filter, M_DEVBUF); 814 sc->vtnet_vlan_filter = NULL; 815 } 816 } 817 818 static int 819 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 820 { 821 device_t dev; 822 struct vq_alloc_info *info; 823 struct vtnet_rxq *rxq; 824 struct vtnet_txq *txq; 825 int i, idx, flags, nvqs, rxsegs, error; 826 827 dev = sc->vtnet_dev; 828 flags = 0; 829 830 /* 831 * Indirect descriptors are not needed for the Rx virtqueue when 832 * mergeable buffers are negotiated. The header is placed inline 833 * with the data, not in a separate descriptor, and mbuf clusters 834 * are always physically contiguous. 835 */ 836 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 837 rxsegs = 0; 838 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 839 rxsegs = VTNET_MAX_RX_SEGS; 840 else 841 rxsegs = VTNET_MIN_RX_SEGS; 842 843 nvqs = sc->vtnet_max_vq_pairs * 2; 844 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 845 nvqs++; 846 847 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 848 if (info == NULL) 849 return (ENOMEM); 850 851 for (i = 0, idx = 0; i < sc->vtnet_max_vq_pairs; i++, idx+=2) { 852 rxq = &sc->vtnet_rxqs[i]; 853 VQ_ALLOC_INFO_INIT(&info[idx], rxsegs, 854 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 855 "%s-%d rx", device_get_nameunit(dev), rxq->vtnrx_id); 856 857 txq = &sc->vtnet_txqs[i]; 858 VQ_ALLOC_INFO_INIT(&info[idx+1], VTNET_MAX_TX_SEGS, 859 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 860 "%s-%d tx", device_get_nameunit(dev), txq->vtntx_id); 861 } 862 863 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 864 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 865 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 866 } 867 868 /* 869 * Enable interrupt binding if this is multiqueue. This only matters 870 * when per-vq MSIX is available. 871 */ 872 if (sc->vtnet_flags & VTNET_FLAG_MULTIQ) 873 flags |= 0; 874 875 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 876 free(info, M_TEMP); 877 878 return (error); 879 } 880 881 static int 882 vtnet_setup_interface(struct vtnet_softc *sc) 883 { 884 device_t dev; 885 struct ifnet *ifp; 886 int limit; 887 888 dev = sc->vtnet_dev; 889 890 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER); 891 if (ifp == NULL) { 892 device_printf(dev, "cannot allocate ifnet structure\n"); 893 return (ENOSPC); 894 } 895 896 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 897 if_initbaudrate(ifp, IF_Gbps(10)); /* Approx. */ 898 ifp->if_softc = sc; 899 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 900 ifp->if_init = vtnet_init; 901 ifp->if_ioctl = vtnet_ioctl; 902 903 #ifndef VTNET_LEGACY_TX 904 ifp->if_transmit = vtnet_txq_mq_start; 905 ifp->if_qflush = vtnet_qflush; 906 #else 907 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 908 ifp->if_start = vtnet_start; 909 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1); 910 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1; 911 IFQ_SET_READY(&ifp->if_snd); 912 #endif 913 914 ifmedia_init(&sc->vtnet_media, IFM_IMASK, vtnet_ifmedia_upd, 915 vtnet_ifmedia_sts); 916 ifmedia_add(&sc->vtnet_media, VTNET_MEDIATYPE, 0, NULL); 917 ifmedia_set(&sc->vtnet_media, VTNET_MEDIATYPE); 918 919 /* Read (or generate) the MAC address for the adapter. */ 920 vtnet_get_hwaddr(sc); 921 922 ether_ifattach(ifp, sc->vtnet_hwaddr); 923 924 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 925 ifp->if_capabilities |= IFCAP_LINKSTATE; 926 927 /* Tell the upper layer(s) we support long frames. */ 928 ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header); 929 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 930 931 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 932 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6; 933 934 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO)) { 935 ifp->if_capabilities |= IFCAP_TSO4 | IFCAP_TSO6; 936 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 937 } else { 938 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 939 ifp->if_capabilities |= IFCAP_TSO4; 940 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 941 ifp->if_capabilities |= IFCAP_TSO6; 942 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 943 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 944 } 945 946 if (ifp->if_capabilities & IFCAP_TSO) 947 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 948 } 949 950 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) 951 ifp->if_capabilities |= IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6; 952 953 if (ifp->if_capabilities & IFCAP_HWCSUM) { 954 /* 955 * VirtIO does not support VLAN tagging, but we can fake 956 * it by inserting and removing the 802.1Q header during 957 * transmit and receive. We are then able to do checksum 958 * offloading of VLAN frames. 959 */ 960 ifp->if_capabilities |= 961 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 962 } 963 964 ifp->if_capenable = ifp->if_capabilities; 965 966 /* 967 * Capabilities after here are not enabled by default. 968 */ 969 970 if (ifp->if_capabilities & IFCAP_RXCSUM) { 971 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) || 972 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6)) 973 ifp->if_capabilities |= IFCAP_LRO; 974 } 975 976 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 977 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 978 979 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 980 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 981 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 982 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 983 } 984 985 limit = vtnet_tunable_int(sc, "rx_process_limit", 986 vtnet_rx_process_limit); 987 if (limit < 0) 988 limit = INT_MAX; 989 sc->vtnet_rx_process_limit = limit; 990 991 return (0); 992 } 993 994 static int 995 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu) 996 { 997 struct ifnet *ifp; 998 int frame_size, clsize; 999 1000 ifp = sc->vtnet_ifp; 1001 1002 if (new_mtu < ETHERMIN || new_mtu > VTNET_MAX_MTU) 1003 return (EINVAL); 1004 1005 frame_size = sc->vtnet_hdr_size + sizeof(struct ether_vlan_header) + 1006 new_mtu; 1007 1008 /* 1009 * Based on the new MTU (and hence frame size) determine which 1010 * cluster size is most appropriate for the receive queues. 1011 */ 1012 if (frame_size <= MCLBYTES) { 1013 clsize = MCLBYTES; 1014 } else if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1015 /* Avoid going past 9K jumbos. */ 1016 if (frame_size > MJUM9BYTES) 1017 return (EINVAL); 1018 clsize = MJUM9BYTES; 1019 } else 1020 clsize = MJUMPAGESIZE; 1021 1022 ifp->if_mtu = new_mtu; 1023 sc->vtnet_rx_new_clsize = clsize; 1024 1025 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1026 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1027 vtnet_init_locked(sc); 1028 } 1029 1030 return (0); 1031 } 1032 1033 static int 1034 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1035 { 1036 struct vtnet_softc *sc; 1037 struct ifreq *ifr; 1038 int reinit, mask, error; 1039 1040 sc = ifp->if_softc; 1041 ifr = (struct ifreq *) data; 1042 error = 0; 1043 1044 switch (cmd) { 1045 case SIOCSIFMTU: 1046 if (ifp->if_mtu != ifr->ifr_mtu) { 1047 VTNET_CORE_LOCK(sc); 1048 error = vtnet_change_mtu(sc, ifr->ifr_mtu); 1049 VTNET_CORE_UNLOCK(sc); 1050 } 1051 break; 1052 1053 case SIOCSIFFLAGS: 1054 VTNET_CORE_LOCK(sc); 1055 if ((ifp->if_flags & IFF_UP) == 0) { 1056 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1057 vtnet_stop(sc); 1058 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1059 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 1060 (IFF_PROMISC | IFF_ALLMULTI)) { 1061 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1062 vtnet_rx_filter(sc); 1063 else 1064 error = ENOTSUP; 1065 } 1066 } else 1067 vtnet_init_locked(sc); 1068 1069 if (error == 0) 1070 sc->vtnet_if_flags = ifp->if_flags; 1071 VTNET_CORE_UNLOCK(sc); 1072 break; 1073 1074 case SIOCADDMULTI: 1075 case SIOCDELMULTI: 1076 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 1077 break; 1078 VTNET_CORE_LOCK(sc); 1079 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1080 vtnet_rx_filter_mac(sc); 1081 VTNET_CORE_UNLOCK(sc); 1082 break; 1083 1084 case SIOCSIFMEDIA: 1085 case SIOCGIFMEDIA: 1086 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1087 break; 1088 1089 case SIOCSIFCAP: 1090 VTNET_CORE_LOCK(sc); 1091 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 1092 1093 if (mask & IFCAP_TXCSUM) 1094 ifp->if_capenable ^= IFCAP_TXCSUM; 1095 if (mask & IFCAP_TXCSUM_IPV6) 1096 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1097 if (mask & IFCAP_TSO4) 1098 ifp->if_capenable ^= IFCAP_TSO4; 1099 if (mask & IFCAP_TSO6) 1100 ifp->if_capenable ^= IFCAP_TSO6; 1101 1102 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO | 1103 IFCAP_VLAN_HWFILTER)) { 1104 /* These Rx features require us to renegotiate. */ 1105 reinit = 1; 1106 1107 if (mask & IFCAP_RXCSUM) 1108 ifp->if_capenable ^= IFCAP_RXCSUM; 1109 if (mask & IFCAP_RXCSUM_IPV6) 1110 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1111 if (mask & IFCAP_LRO) 1112 ifp->if_capenable ^= IFCAP_LRO; 1113 if (mask & IFCAP_VLAN_HWFILTER) 1114 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1115 } else 1116 reinit = 0; 1117 1118 if (mask & IFCAP_VLAN_HWTSO) 1119 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1120 if (mask & IFCAP_VLAN_HWTAGGING) 1121 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1122 1123 if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1124 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1125 vtnet_init_locked(sc); 1126 } 1127 1128 VTNET_CORE_UNLOCK(sc); 1129 VLAN_CAPABILITIES(ifp); 1130 1131 break; 1132 1133 default: 1134 error = ether_ioctl(ifp, cmd, data); 1135 break; 1136 } 1137 1138 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1139 1140 return (error); 1141 } 1142 1143 static int 1144 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1145 { 1146 struct virtqueue *vq; 1147 int nbufs, error; 1148 1149 vq = rxq->vtnrx_vq; 1150 error = ENOSPC; 1151 1152 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1153 error = vtnet_rxq_new_buf(rxq); 1154 if (error) 1155 break; 1156 } 1157 1158 if (nbufs > 0) { 1159 virtqueue_notify(vq); 1160 /* 1161 * EMSGSIZE signifies the virtqueue did not have enough 1162 * entries available to hold the last mbuf. This is not 1163 * an error. 1164 */ 1165 if (error == EMSGSIZE) 1166 error = 0; 1167 } 1168 1169 return (error); 1170 } 1171 1172 static void 1173 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1174 { 1175 struct virtqueue *vq; 1176 struct mbuf *m; 1177 int last; 1178 1179 vq = rxq->vtnrx_vq; 1180 last = 0; 1181 1182 while ((m = virtqueue_drain(vq, &last)) != NULL) 1183 m_freem(m); 1184 1185 KASSERT(virtqueue_empty(vq), 1186 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1187 } 1188 1189 static struct mbuf * 1190 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1191 { 1192 struct mbuf *m_head, *m_tail, *m; 1193 int i, clsize; 1194 1195 clsize = sc->vtnet_rx_clsize; 1196 1197 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1198 ("%s: chained mbuf %d request without LRO_NOMRG", __func__, nbufs)); 1199 1200 m_head = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, clsize); 1201 if (m_head == NULL) 1202 goto fail; 1203 1204 m_head->m_len = clsize; 1205 m_tail = m_head; 1206 1207 /* Allocate the rest of the chain. */ 1208 for (i = 1; i < nbufs; i++) { 1209 m = m_getjcl(M_NOWAIT, MT_DATA, 0, clsize); 1210 if (m == NULL) 1211 goto fail; 1212 1213 m->m_len = clsize; 1214 m_tail->m_next = m; 1215 m_tail = m; 1216 } 1217 1218 if (m_tailp != NULL) 1219 *m_tailp = m_tail; 1220 1221 return (m_head); 1222 1223 fail: 1224 sc->vtnet_stats.mbuf_alloc_failed++; 1225 m_freem(m_head); 1226 1227 return (NULL); 1228 } 1229 1230 /* 1231 * Slow path for when LRO without mergeable buffers is negotiated. 1232 */ 1233 static int 1234 vtnet_rxq_replace_lro_nomgr_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1235 int len0) 1236 { 1237 struct vtnet_softc *sc; 1238 struct mbuf *m, *m_prev; 1239 struct mbuf *m_new, *m_tail; 1240 int len, clsize, nreplace, error; 1241 1242 sc = rxq->vtnrx_sc; 1243 clsize = sc->vtnet_rx_clsize; 1244 1245 m_prev = NULL; 1246 m_tail = NULL; 1247 nreplace = 0; 1248 1249 m = m0; 1250 len = len0; 1251 1252 /* 1253 * Since these mbuf chains are so large, we avoid allocating an 1254 * entire replacement chain if possible. When the received frame 1255 * did not consume the entire chain, the unused mbufs are moved 1256 * to the replacement chain. 1257 */ 1258 while (len > 0) { 1259 /* 1260 * Something is seriously wrong if we received a frame 1261 * larger than the chain. Drop it. 1262 */ 1263 if (m == NULL) { 1264 sc->vtnet_stats.rx_frame_too_large++; 1265 return (EMSGSIZE); 1266 } 1267 1268 /* We always allocate the same cluster size. */ 1269 KASSERT(m->m_len == clsize, 1270 ("%s: mbuf size %d is not the cluster size %d", 1271 __func__, m->m_len, clsize)); 1272 1273 m->m_len = MIN(m->m_len, len); 1274 len -= m->m_len; 1275 1276 m_prev = m; 1277 m = m->m_next; 1278 nreplace++; 1279 } 1280 1281 KASSERT(nreplace <= sc->vtnet_rx_nmbufs, 1282 ("%s: too many replacement mbufs %d max %d", __func__, nreplace, 1283 sc->vtnet_rx_nmbufs)); 1284 1285 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1286 if (m_new == NULL) { 1287 m_prev->m_len = clsize; 1288 return (ENOBUFS); 1289 } 1290 1291 /* 1292 * Move any unused mbufs from the received chain onto the end 1293 * of the new chain. 1294 */ 1295 if (m_prev->m_next != NULL) { 1296 m_tail->m_next = m_prev->m_next; 1297 m_prev->m_next = NULL; 1298 } 1299 1300 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1301 if (error) { 1302 /* 1303 * BAD! We could not enqueue the replacement mbuf chain. We 1304 * must restore the m0 chain to the original state if it was 1305 * modified so we can subsequently discard it. 1306 * 1307 * NOTE: The replacement is suppose to be an identical copy 1308 * to the one just dequeued so this is an unexpected error. 1309 */ 1310 sc->vtnet_stats.rx_enq_replacement_failed++; 1311 1312 if (m_tail->m_next != NULL) { 1313 m_prev->m_next = m_tail->m_next; 1314 m_tail->m_next = NULL; 1315 } 1316 1317 m_prev->m_len = clsize; 1318 m_freem(m_new); 1319 } 1320 1321 return (error); 1322 } 1323 1324 static int 1325 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1326 { 1327 struct vtnet_softc *sc; 1328 struct mbuf *m_new; 1329 int error; 1330 1331 sc = rxq->vtnrx_sc; 1332 1333 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || m->m_next == NULL, 1334 ("%s: chained mbuf without LRO_NOMRG", __func__)); 1335 1336 if (m->m_next == NULL) { 1337 /* Fast-path for the common case of just one mbuf. */ 1338 if (m->m_len < len) 1339 return (EINVAL); 1340 1341 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1342 if (m_new == NULL) 1343 return (ENOBUFS); 1344 1345 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1346 if (error) { 1347 /* 1348 * The new mbuf is suppose to be an identical 1349 * copy of the one just dequeued so this is an 1350 * unexpected error. 1351 */ 1352 m_freem(m_new); 1353 sc->vtnet_stats.rx_enq_replacement_failed++; 1354 } else 1355 m->m_len = len; 1356 } else 1357 error = vtnet_rxq_replace_lro_nomgr_buf(rxq, m, len); 1358 1359 return (error); 1360 } 1361 1362 static int 1363 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1364 { 1365 struct sglist sg; 1366 struct sglist_seg segs[VTNET_MAX_RX_SEGS]; 1367 struct vtnet_softc *sc; 1368 struct vtnet_rx_header *rxhdr; 1369 uint8_t *mdata; 1370 int offset, error; 1371 1372 sc = rxq->vtnrx_sc; 1373 mdata = mtod(m, uint8_t *); 1374 1375 VTNET_RXQ_LOCK_ASSERT(rxq); 1376 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || m->m_next == NULL, 1377 ("%s: chained mbuf without LRO_NOMRG", __func__)); 1378 KASSERT(m->m_len == sc->vtnet_rx_clsize, 1379 ("%s: unexpected cluster size %d/%d", __func__, m->m_len, 1380 sc->vtnet_rx_clsize)); 1381 1382 sglist_init(&sg, VTNET_MAX_RX_SEGS, segs); 1383 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1384 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1385 rxhdr = (struct vtnet_rx_header *) mdata; 1386 sglist_append(&sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1387 offset = sizeof(struct vtnet_rx_header); 1388 } else 1389 offset = 0; 1390 1391 sglist_append(&sg, mdata + offset, m->m_len - offset); 1392 if (m->m_next != NULL) { 1393 error = sglist_append_mbuf(&sg, m->m_next); 1394 MPASS(error == 0); 1395 } 1396 1397 error = virtqueue_enqueue(rxq->vtnrx_vq, m, &sg, 0, sg.sg_nseg); 1398 1399 return (error); 1400 } 1401 1402 static int 1403 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1404 { 1405 struct vtnet_softc *sc; 1406 struct mbuf *m; 1407 int error; 1408 1409 sc = rxq->vtnrx_sc; 1410 1411 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1412 if (m == NULL) 1413 return (ENOBUFS); 1414 1415 error = vtnet_rxq_enqueue_buf(rxq, m); 1416 if (error) 1417 m_freem(m); 1418 1419 return (error); 1420 } 1421 1422 /* 1423 * Use the checksum offset in the VirtIO header to set the 1424 * correct CSUM_* flags. 1425 */ 1426 static int 1427 vtnet_rxq_csum_by_offset(struct vtnet_rxq *rxq, struct mbuf *m, 1428 uint16_t eth_type, int ip_start, struct virtio_net_hdr *hdr) 1429 { 1430 struct vtnet_softc *sc; 1431 #if defined(INET) || defined(INET6) 1432 int offset = hdr->csum_start + hdr->csum_offset; 1433 #endif 1434 1435 sc = rxq->vtnrx_sc; 1436 1437 /* Only do a basic sanity check on the offset. */ 1438 switch (eth_type) { 1439 #if defined(INET) 1440 case ETHERTYPE_IP: 1441 if (__predict_false(offset < ip_start + sizeof(struct ip))) 1442 return (1); 1443 break; 1444 #endif 1445 #if defined(INET6) 1446 case ETHERTYPE_IPV6: 1447 if (__predict_false(offset < ip_start + sizeof(struct ip6_hdr))) 1448 return (1); 1449 break; 1450 #endif 1451 default: 1452 sc->vtnet_stats.rx_csum_bad_ethtype++; 1453 return (1); 1454 } 1455 1456 /* 1457 * Use the offset to determine the appropriate CSUM_* flags. This is 1458 * a bit dirty, but we can get by with it since the checksum offsets 1459 * happen to be different. We assume the host host does not do IPv4 1460 * header checksum offloading. 1461 */ 1462 switch (hdr->csum_offset) { 1463 case offsetof(struct udphdr, uh_sum): 1464 case offsetof(struct tcphdr, th_sum): 1465 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1466 m->m_pkthdr.csum_data = 0xFFFF; 1467 break; 1468 case offsetof(struct sctphdr, checksum): 1469 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1470 break; 1471 default: 1472 sc->vtnet_stats.rx_csum_bad_offset++; 1473 return (1); 1474 } 1475 1476 return (0); 1477 } 1478 1479 static int 1480 vtnet_rxq_csum_by_parse(struct vtnet_rxq *rxq, struct mbuf *m, 1481 uint16_t eth_type, int ip_start, struct virtio_net_hdr *hdr) 1482 { 1483 struct vtnet_softc *sc; 1484 int offset, proto; 1485 1486 sc = rxq->vtnrx_sc; 1487 1488 switch (eth_type) { 1489 #if defined(INET) 1490 case ETHERTYPE_IP: { 1491 struct ip *ip; 1492 if (__predict_false(m->m_len < ip_start + sizeof(struct ip))) 1493 return (1); 1494 ip = (struct ip *)(m->m_data + ip_start); 1495 proto = ip->ip_p; 1496 offset = ip_start + (ip->ip_hl << 2); 1497 break; 1498 } 1499 #endif 1500 #if defined(INET6) 1501 case ETHERTYPE_IPV6: 1502 if (__predict_false(m->m_len < ip_start + 1503 sizeof(struct ip6_hdr))) 1504 return (1); 1505 offset = ip6_lasthdr(m, ip_start, IPPROTO_IPV6, &proto); 1506 if (__predict_false(offset < 0)) 1507 return (1); 1508 break; 1509 #endif 1510 default: 1511 sc->vtnet_stats.rx_csum_bad_ethtype++; 1512 return (1); 1513 } 1514 1515 switch (proto) { 1516 case IPPROTO_TCP: 1517 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) 1518 return (1); 1519 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1520 m->m_pkthdr.csum_data = 0xFFFF; 1521 break; 1522 case IPPROTO_UDP: 1523 if (__predict_false(m->m_len < offset + sizeof(struct udphdr))) 1524 return (1); 1525 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1526 m->m_pkthdr.csum_data = 0xFFFF; 1527 break; 1528 case IPPROTO_SCTP: 1529 if (__predict_false(m->m_len < offset + sizeof(struct sctphdr))) 1530 return (1); 1531 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1532 break; 1533 default: 1534 /* 1535 * For the remaining protocols, FreeBSD does not support 1536 * checksum offloading, so the checksum will be recomputed. 1537 */ 1538 #if 0 1539 if_printf(sc->vtnet_ifp, "cksum offload of unsupported " 1540 "protocol eth_type=%#x proto=%d csum_start=%d " 1541 "csum_offset=%d\n", __func__, eth_type, proto, 1542 hdr->csum_start, hdr->csum_offset); 1543 #endif 1544 break; 1545 } 1546 1547 return (0); 1548 } 1549 1550 /* 1551 * Set the appropriate CSUM_* flags. Unfortunately, the information 1552 * provided is not directly useful to us. The VirtIO header gives the 1553 * offset of the checksum, which is all Linux needs, but this is not 1554 * how FreeBSD does things. We are forced to peek inside the packet 1555 * a bit. 1556 * 1557 * It would be nice if VirtIO gave us the L4 protocol or if FreeBSD 1558 * could accept the offsets and let the stack figure it out. 1559 */ 1560 static int 1561 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1562 struct virtio_net_hdr *hdr) 1563 { 1564 struct ether_header *eh; 1565 struct ether_vlan_header *evh; 1566 uint16_t eth_type; 1567 int offset, error; 1568 1569 eh = mtod(m, struct ether_header *); 1570 eth_type = ntohs(eh->ether_type); 1571 if (eth_type == ETHERTYPE_VLAN) { 1572 /* BMV: We should handle nested VLAN tags too. */ 1573 evh = mtod(m, struct ether_vlan_header *); 1574 eth_type = ntohs(evh->evl_proto); 1575 offset = sizeof(struct ether_vlan_header); 1576 } else 1577 offset = sizeof(struct ether_header); 1578 1579 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1580 error = vtnet_rxq_csum_by_offset(rxq, m, eth_type, offset, hdr); 1581 else 1582 error = vtnet_rxq_csum_by_parse(rxq, m, eth_type, offset, hdr); 1583 1584 return (error); 1585 } 1586 1587 static void 1588 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1589 { 1590 struct mbuf *m; 1591 1592 while (--nbufs > 0) { 1593 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1594 if (m == NULL) 1595 break; 1596 vtnet_rxq_discard_buf(rxq, m); 1597 } 1598 } 1599 1600 static void 1601 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1602 { 1603 int error; 1604 1605 /* 1606 * Requeue the discarded mbuf. This should always be successful 1607 * since it was just dequeued. 1608 */ 1609 error = vtnet_rxq_enqueue_buf(rxq, m); 1610 KASSERT(error == 0, 1611 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1612 } 1613 1614 static int 1615 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1616 { 1617 struct vtnet_softc *sc; 1618 struct ifnet *ifp; 1619 struct virtqueue *vq; 1620 struct mbuf *m, *m_tail; 1621 int len; 1622 1623 sc = rxq->vtnrx_sc; 1624 vq = rxq->vtnrx_vq; 1625 ifp = sc->vtnet_ifp; 1626 m_tail = m_head; 1627 1628 while (--nbufs > 0) { 1629 m = virtqueue_dequeue(vq, &len); 1630 if (m == NULL) { 1631 rxq->vtnrx_stats.vrxs_ierrors++; 1632 goto fail; 1633 } 1634 1635 if (vtnet_rxq_new_buf(rxq) != 0) { 1636 rxq->vtnrx_stats.vrxs_iqdrops++; 1637 vtnet_rxq_discard_buf(rxq, m); 1638 if (nbufs > 1) 1639 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1640 goto fail; 1641 } 1642 1643 if (m->m_len < len) 1644 len = m->m_len; 1645 1646 m->m_len = len; 1647 m->m_flags &= ~M_PKTHDR; 1648 1649 m_head->m_pkthdr.len += len; 1650 m_tail->m_next = m; 1651 m_tail = m; 1652 } 1653 1654 return (0); 1655 1656 fail: 1657 sc->vtnet_stats.rx_mergeable_failed++; 1658 m_freem(m_head); 1659 1660 return (1); 1661 } 1662 1663 static void 1664 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1665 struct virtio_net_hdr *hdr) 1666 { 1667 struct vtnet_softc *sc; 1668 struct ifnet *ifp; 1669 struct ether_header *eh; 1670 1671 sc = rxq->vtnrx_sc; 1672 ifp = sc->vtnet_ifp; 1673 1674 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1675 eh = mtod(m, struct ether_header *); 1676 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1677 vtnet_vlan_tag_remove(m); 1678 /* 1679 * With the 802.1Q header removed, update the 1680 * checksum starting location accordingly. 1681 */ 1682 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1683 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 1684 } 1685 } 1686 1687 m->m_pkthdr.flowid = rxq->vtnrx_id; 1688 m->m_flags |= M_FLOWID; 1689 1690 /* 1691 * BMV: FreeBSD does not have the UNNECESSARY and PARTIAL checksum 1692 * distinction that Linux does. Need to reevaluate if performing 1693 * offloading for the NEEDS_CSUM case is really appropriate. 1694 */ 1695 if (hdr->flags & (VIRTIO_NET_HDR_F_NEEDS_CSUM | 1696 VIRTIO_NET_HDR_F_DATA_VALID)) { 1697 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 1698 rxq->vtnrx_stats.vrxs_csum++; 1699 else 1700 rxq->vtnrx_stats.vrxs_csum_failed++; 1701 } 1702 1703 rxq->vtnrx_stats.vrxs_ipackets++; 1704 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 1705 1706 VTNET_RXQ_UNLOCK(rxq); 1707 (*ifp->if_input)(ifp, m); 1708 VTNET_RXQ_LOCK(rxq); 1709 } 1710 1711 static int 1712 vtnet_rxq_eof(struct vtnet_rxq *rxq) 1713 { 1714 struct virtio_net_hdr lhdr, *hdr; 1715 struct vtnet_softc *sc; 1716 struct ifnet *ifp; 1717 struct virtqueue *vq; 1718 struct mbuf *m; 1719 struct virtio_net_hdr_mrg_rxbuf *mhdr; 1720 int len, deq, nbufs, adjsz, count; 1721 1722 sc = rxq->vtnrx_sc; 1723 vq = rxq->vtnrx_vq; 1724 ifp = sc->vtnet_ifp; 1725 hdr = &lhdr; 1726 deq = 0; 1727 count = sc->vtnet_rx_process_limit; 1728 1729 VTNET_RXQ_LOCK_ASSERT(rxq); 1730 1731 while (count-- > 0) { 1732 m = virtqueue_dequeue(vq, &len); 1733 if (m == NULL) 1734 break; 1735 deq++; 1736 1737 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 1738 rxq->vtnrx_stats.vrxs_ierrors++; 1739 vtnet_rxq_discard_buf(rxq, m); 1740 continue; 1741 } 1742 1743 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1744 nbufs = 1; 1745 adjsz = sizeof(struct vtnet_rx_header); 1746 /* 1747 * Account for our pad inserted between the header 1748 * and the actual start of the frame. 1749 */ 1750 len += VTNET_RX_HEADER_PAD; 1751 } else { 1752 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 1753 nbufs = mhdr->num_buffers; 1754 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1755 } 1756 1757 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 1758 rxq->vtnrx_stats.vrxs_iqdrops++; 1759 vtnet_rxq_discard_buf(rxq, m); 1760 if (nbufs > 1) 1761 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1762 continue; 1763 } 1764 1765 m->m_pkthdr.len = len; 1766 m->m_pkthdr.rcvif = ifp; 1767 m->m_pkthdr.csum_flags = 0; 1768 1769 if (nbufs > 1) { 1770 /* Dequeue the rest of chain. */ 1771 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 1772 continue; 1773 } 1774 1775 /* 1776 * Save copy of header before we strip it. For both mergeable 1777 * and non-mergeable, the header is at the beginning of the 1778 * mbuf data. We no longer need num_buffers, so always use a 1779 * regular header. 1780 * 1781 * BMV: Is this memcpy() expensive? We know the mbuf data is 1782 * still valid even after the m_adj(). 1783 */ 1784 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr)); 1785 m_adj(m, adjsz); 1786 1787 vtnet_rxq_input(rxq, m, hdr); 1788 1789 /* Must recheck after dropping the Rx lock. */ 1790 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1791 break; 1792 } 1793 1794 if (deq > 0) 1795 virtqueue_notify(vq); 1796 1797 return (count > 0 ? 0 : EAGAIN); 1798 } 1799 1800 static void 1801 vtnet_rx_vq_intr(void *xrxq) 1802 { 1803 struct vtnet_softc *sc; 1804 struct vtnet_rxq *rxq; 1805 struct ifnet *ifp; 1806 int tries, more; 1807 1808 rxq = xrxq; 1809 sc = rxq->vtnrx_sc; 1810 ifp = sc->vtnet_ifp; 1811 tries = 0; 1812 1813 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 1814 /* 1815 * Ignore this interrupt. Either this is a spurious interrupt 1816 * or multiqueue without per-VQ MSIX so every queue needs to 1817 * be polled (a brain dead configuration we could try harder 1818 * to avoid). 1819 */ 1820 vtnet_rxq_disable_intr(rxq); 1821 return; 1822 } 1823 1824 VTNET_RXQ_LOCK(rxq); 1825 1826 again: 1827 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1828 VTNET_RXQ_UNLOCK(rxq); 1829 return; 1830 } 1831 1832 more = vtnet_rxq_eof(rxq); 1833 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 1834 if (!more) 1835 vtnet_rxq_disable_intr(rxq); 1836 /* 1837 * This is an occasional condition or race (when !more), 1838 * so retry a few times before scheduling the taskqueue. 1839 */ 1840 if (tries++ < VTNET_INTR_DISABLE_RETRIES) 1841 goto again; 1842 1843 VTNET_RXQ_UNLOCK(rxq); 1844 rxq->vtnrx_stats.vrxs_rescheduled++; 1845 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1846 } else 1847 VTNET_RXQ_UNLOCK(rxq); 1848 } 1849 1850 static void 1851 vtnet_rxq_tq_intr(void *xrxq, int pending) 1852 { 1853 struct vtnet_softc *sc; 1854 struct vtnet_rxq *rxq; 1855 struct ifnet *ifp; 1856 int more; 1857 1858 rxq = xrxq; 1859 sc = rxq->vtnrx_sc; 1860 ifp = sc->vtnet_ifp; 1861 1862 VTNET_RXQ_LOCK(rxq); 1863 1864 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1865 VTNET_RXQ_UNLOCK(rxq); 1866 return; 1867 } 1868 1869 more = vtnet_rxq_eof(rxq); 1870 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 1871 if (!more) 1872 vtnet_rxq_disable_intr(rxq); 1873 rxq->vtnrx_stats.vrxs_rescheduled++; 1874 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1875 } 1876 1877 VTNET_RXQ_UNLOCK(rxq); 1878 } 1879 1880 static void 1881 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 1882 { 1883 struct virtqueue *vq; 1884 struct vtnet_tx_header *txhdr; 1885 int last; 1886 1887 vq = txq->vtntx_vq; 1888 last = 0; 1889 1890 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 1891 m_freem(txhdr->vth_mbuf); 1892 uma_zfree(vtnet_tx_header_zone, txhdr); 1893 } 1894 1895 KASSERT(virtqueue_empty(vq), 1896 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 1897 } 1898 1899 /* 1900 * BMV: Much of this can go away once we finally have offsets in 1901 * the mbuf packet header. Bug andre@. 1902 */ 1903 static int 1904 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, 1905 int *etype, int *proto, int *start) 1906 { 1907 struct vtnet_softc *sc; 1908 struct ether_vlan_header *evh; 1909 int offset; 1910 1911 sc = txq->vtntx_sc; 1912 1913 evh = mtod(m, struct ether_vlan_header *); 1914 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 1915 /* BMV: We should handle nested VLAN tags too. */ 1916 *etype = ntohs(evh->evl_proto); 1917 offset = sizeof(struct ether_vlan_header); 1918 } else { 1919 *etype = ntohs(evh->evl_encap_proto); 1920 offset = sizeof(struct ether_header); 1921 } 1922 1923 switch (*etype) { 1924 #if defined(INET) 1925 case ETHERTYPE_IP: { 1926 struct ip *ip, iphdr; 1927 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 1928 m_copydata(m, offset, sizeof(struct ip), 1929 (caddr_t) &iphdr); 1930 ip = &iphdr; 1931 } else 1932 ip = (struct ip *)(m->m_data + offset); 1933 *proto = ip->ip_p; 1934 *start = offset + (ip->ip_hl << 2); 1935 break; 1936 } 1937 #endif 1938 #if defined(INET6) 1939 case ETHERTYPE_IPV6: 1940 *proto = -1; 1941 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 1942 /* Assert the network stack sent us a valid packet. */ 1943 KASSERT(*start > offset, 1944 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 1945 *start, offset, *proto)); 1946 break; 1947 #endif 1948 default: 1949 sc->vtnet_stats.tx_csum_bad_ethtype++; 1950 return (EINVAL); 1951 } 1952 1953 return (0); 1954 } 1955 1956 static int 1957 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 1958 int offset, struct virtio_net_hdr *hdr) 1959 { 1960 static struct timeval lastecn; 1961 static int curecn; 1962 struct vtnet_softc *sc; 1963 struct tcphdr *tcp, tcphdr; 1964 1965 sc = txq->vtntx_sc; 1966 1967 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 1968 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 1969 tcp = &tcphdr; 1970 } else 1971 tcp = (struct tcphdr *)(m->m_data + offset); 1972 1973 hdr->hdr_len = offset + (tcp->th_off << 2); 1974 hdr->gso_size = m->m_pkthdr.tso_segsz; 1975 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 1976 VIRTIO_NET_HDR_GSO_TCPV6; 1977 1978 if (tcp->th_flags & TH_CWR) { 1979 /* 1980 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD, 1981 * ECN support is not on a per-interface basis, but globally via 1982 * the net.inet.tcp.ecn.enable sysctl knob. The default is off. 1983 */ 1984 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 1985 if (ppsratecheck(&lastecn, &curecn, 1)) 1986 if_printf(sc->vtnet_ifp, 1987 "TSO with ECN not negotiated with host\n"); 1988 return (ENOTSUP); 1989 } 1990 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 1991 } 1992 1993 txq->vtntx_stats.vtxs_tso++; 1994 1995 return (0); 1996 } 1997 1998 static struct mbuf * 1999 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2000 struct virtio_net_hdr *hdr) 2001 { 2002 struct vtnet_softc *sc; 2003 int flags, etype, csum_start, proto, error; 2004 2005 sc = txq->vtntx_sc; 2006 flags = m->m_pkthdr.csum_flags; 2007 2008 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2009 if (error) 2010 goto drop; 2011 2012 if ((etype == ETHERTYPE_IP && flags & VTNET_CSUM_OFFLOAD) || 2013 (etype == ETHERTYPE_IPV6 && flags & VTNET_CSUM_OFFLOAD_IPV6)) { 2014 /* 2015 * We could compare the IP protocol vs the CSUM_ flag too, 2016 * but that really should not be necessary. 2017 */ 2018 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2019 hdr->csum_start = csum_start; 2020 hdr->csum_offset = m->m_pkthdr.csum_data; 2021 txq->vtntx_stats.vtxs_csum++; 2022 } 2023 2024 if (flags & CSUM_TSO) { 2025 if (__predict_false(proto != IPPROTO_TCP)) { 2026 /* Likely failed to correctly parse the mbuf. */ 2027 sc->vtnet_stats.tx_tso_not_tcp++; 2028 goto drop; 2029 } 2030 2031 KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM, 2032 ("%s: mbuf %p TSO without checksum offload %#x", 2033 __func__, m, flags)); 2034 2035 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2036 if (error) 2037 goto drop; 2038 } 2039 2040 return (m); 2041 2042 drop: 2043 m_freem(m); 2044 return (NULL); 2045 } 2046 2047 static int 2048 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2049 struct vtnet_tx_header *txhdr) 2050 { 2051 struct sglist sg; 2052 struct sglist_seg segs[VTNET_MAX_TX_SEGS]; 2053 struct vtnet_softc *sc; 2054 struct virtqueue *vq; 2055 struct mbuf *m; 2056 int collapsed, error; 2057 2058 vq = txq->vtntx_vq; 2059 sc = txq->vtntx_sc; 2060 m = *m_head; 2061 collapsed = 0; 2062 2063 sglist_init(&sg, VTNET_MAX_TX_SEGS, segs); 2064 error = sglist_append(&sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2065 KASSERT(error == 0 && sg.sg_nseg == 1, 2066 ("%s: error %d adding header to sglist", __func__, error)); 2067 2068 again: 2069 error = sglist_append_mbuf(&sg, m); 2070 if (error) { 2071 if (collapsed) 2072 goto fail; 2073 2074 m = m_collapse(m, M_NOWAIT, VTNET_MAX_TX_SEGS - 1); 2075 if (m == NULL) 2076 goto fail; 2077 2078 *m_head = m; 2079 collapsed = 1; 2080 txq->vtntx_stats.vtxs_collapsed++; 2081 goto again; 2082 } 2083 2084 txhdr->vth_mbuf = m; 2085 error = virtqueue_enqueue(vq, txhdr, &sg, sg.sg_nseg, 0); 2086 2087 return (error); 2088 2089 fail: 2090 m_freem(*m_head); 2091 *m_head = NULL; 2092 2093 return (ENOBUFS); 2094 } 2095 2096 static int 2097 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head) 2098 { 2099 struct vtnet_softc *sc; 2100 struct vtnet_tx_header *txhdr; 2101 struct virtio_net_hdr *hdr; 2102 struct mbuf *m; 2103 int error; 2104 2105 sc = txq->vtntx_sc; 2106 m = *m_head; 2107 M_ASSERTPKTHDR(m); 2108 2109 txhdr = uma_zalloc(vtnet_tx_header_zone, M_NOWAIT | M_ZERO); 2110 if (txhdr == NULL) { 2111 m_freem(m); 2112 *m_head = NULL; 2113 return (ENOMEM); 2114 } 2115 2116 /* 2117 * Always use the non-mergeable header, regardless if the feature 2118 * was negotiated. For transmit, num_buffers is always zero. The 2119 * vtnet_hdr_size is used to enqueue the correct header size. 2120 */ 2121 hdr = &txhdr->vth_uhdr.hdr; 2122 2123 if (m->m_flags & M_VLANTAG) { 2124 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2125 if ((*m_head = m) == NULL) { 2126 error = ENOBUFS; 2127 goto fail; 2128 } 2129 m->m_flags &= ~M_VLANTAG; 2130 } 2131 2132 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2133 m = vtnet_txq_offload(txq, m, hdr); 2134 if ((*m_head = m) == NULL) { 2135 error = ENOBUFS; 2136 goto fail; 2137 } 2138 } 2139 2140 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2141 if (error == 0) 2142 return (0); 2143 2144 fail: 2145 uma_zfree(vtnet_tx_header_zone, txhdr); 2146 2147 return (error); 2148 } 2149 2150 #ifdef VTNET_LEGACY_TX 2151 2152 static void 2153 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2154 { 2155 struct vtnet_softc *sc; 2156 struct virtqueue *vq; 2157 struct mbuf *m0; 2158 int enq; 2159 2160 sc = txq->vtntx_sc; 2161 vq = txq->vtntx_vq; 2162 enq = 0; 2163 2164 VTNET_TXQ_LOCK_ASSERT(txq); 2165 2166 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2167 sc->vtnet_link_active == 0) 2168 return; 2169 2170 vtnet_txq_eof(txq); 2171 2172 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2173 if (virtqueue_full(vq)) 2174 break; 2175 2176 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2177 if (m0 == NULL) 2178 break; 2179 2180 if (vtnet_txq_encap(txq, &m0) != 0) { 2181 if (m0 != NULL) 2182 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2183 break; 2184 } 2185 2186 enq++; 2187 ETHER_BPF_MTAP(ifp, m0); 2188 } 2189 2190 if (enq > 0) { 2191 virtqueue_notify(vq); 2192 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2193 } 2194 } 2195 2196 static void 2197 vtnet_start(struct ifnet *ifp) 2198 { 2199 struct vtnet_softc *sc; 2200 struct vtnet_txq *txq; 2201 2202 sc = ifp->if_softc; 2203 txq = &sc->vtnet_txqs[0]; 2204 2205 VTNET_TXQ_LOCK(txq); 2206 vtnet_start_locked(txq, ifp); 2207 VTNET_TXQ_UNLOCK(txq); 2208 } 2209 2210 #else /* !VTNET_LEGACY_TX */ 2211 2212 static int 2213 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2214 { 2215 struct vtnet_softc *sc; 2216 struct virtqueue *vq; 2217 struct buf_ring *br; 2218 struct ifnet *ifp; 2219 int enq, error; 2220 2221 sc = txq->vtntx_sc; 2222 vq = txq->vtntx_vq; 2223 br = txq->vtntx_br; 2224 ifp = sc->vtnet_ifp; 2225 enq = 0; 2226 error = 0; 2227 2228 VTNET_TXQ_LOCK_ASSERT(txq); 2229 2230 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2231 sc->vtnet_link_active == 0) { 2232 if (m != NULL) 2233 error = drbr_enqueue(ifp, br, m); 2234 return (error); 2235 } 2236 2237 if (m != NULL) { 2238 error = drbr_enqueue(ifp, br, m); 2239 if (error) 2240 return (error); 2241 } 2242 2243 vtnet_txq_eof(txq); 2244 2245 while ((m = drbr_peek(ifp, br)) != NULL) { 2246 if (virtqueue_full(vq)) { 2247 drbr_putback(ifp, br, m); 2248 error = ENOBUFS; 2249 break; 2250 } 2251 2252 error = vtnet_txq_encap(txq, &m); 2253 if (error) { 2254 if (m != NULL) 2255 drbr_putback(ifp, br, m); 2256 else 2257 drbr_advance(ifp, br); 2258 break; 2259 } 2260 drbr_advance(ifp, br); 2261 2262 enq++; 2263 ETHER_BPF_MTAP(ifp, m); 2264 } 2265 2266 if (enq > 0) { 2267 virtqueue_notify(vq); 2268 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2269 } 2270 2271 return (error); 2272 } 2273 2274 static int 2275 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2276 { 2277 struct vtnet_softc *sc; 2278 struct vtnet_txq *txq; 2279 int i, npairs, error; 2280 2281 sc = ifp->if_softc; 2282 npairs = sc->vtnet_act_vq_pairs; 2283 2284 if (m->m_flags & M_FLOWID) 2285 i = m->m_pkthdr.flowid % npairs; 2286 else 2287 i = curcpu % npairs; 2288 2289 txq = &sc->vtnet_txqs[i]; 2290 2291 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2292 error = vtnet_txq_mq_start_locked(txq, m); 2293 VTNET_TXQ_UNLOCK(txq); 2294 } else { 2295 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2296 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2297 } 2298 2299 return (error); 2300 } 2301 2302 static void 2303 vtnet_txq_tq_deferred(void *xtxq, int pending) 2304 { 2305 struct vtnet_softc *sc; 2306 struct vtnet_txq *txq; 2307 2308 txq = xtxq; 2309 sc = txq->vtntx_sc; 2310 2311 VTNET_TXQ_LOCK(txq); 2312 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2313 vtnet_txq_mq_start_locked(txq, NULL); 2314 VTNET_TXQ_UNLOCK(txq); 2315 } 2316 2317 #endif /* VTNET_LEGACY_TX */ 2318 2319 static void 2320 vtnet_txq_start(struct vtnet_txq *txq) 2321 { 2322 struct vtnet_softc *sc; 2323 struct ifnet *ifp; 2324 2325 sc = txq->vtntx_sc; 2326 ifp = sc->vtnet_ifp; 2327 2328 #ifdef VTNET_LEGACY_TX 2329 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2330 vtnet_start_locked(txq, ifp); 2331 #else 2332 if (!drbr_empty(ifp, txq->vtntx_br)) 2333 vtnet_txq_mq_start_locked(txq, NULL); 2334 #endif 2335 } 2336 2337 static void 2338 vtnet_txq_tq_intr(void *xtxq, int pending) 2339 { 2340 struct vtnet_softc *sc; 2341 struct vtnet_txq *txq; 2342 struct ifnet *ifp; 2343 2344 txq = xtxq; 2345 sc = txq->vtntx_sc; 2346 ifp = sc->vtnet_ifp; 2347 2348 VTNET_TXQ_LOCK(txq); 2349 2350 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2351 VTNET_TXQ_UNLOCK(txq); 2352 return; 2353 } 2354 2355 vtnet_txq_eof(txq); 2356 2357 vtnet_txq_start(txq); 2358 2359 if (vtnet_txq_enable_intr(txq) != 0) { 2360 vtnet_txq_disable_intr(txq); 2361 txq->vtntx_stats.vtxs_rescheduled++; 2362 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2363 } 2364 2365 VTNET_TXQ_UNLOCK(txq); 2366 } 2367 2368 static void 2369 vtnet_txq_eof(struct vtnet_txq *txq) 2370 { 2371 struct virtqueue *vq; 2372 struct vtnet_tx_header *txhdr; 2373 struct mbuf *m; 2374 2375 vq = txq->vtntx_vq; 2376 VTNET_TXQ_LOCK_ASSERT(txq); 2377 2378 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2379 m = txhdr->vth_mbuf; 2380 2381 txq->vtntx_stats.vtxs_opackets++; 2382 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2383 if (m->m_flags & M_MCAST) 2384 txq->vtntx_stats.vtxs_omcasts++; 2385 2386 m_freem(m); 2387 uma_zfree(vtnet_tx_header_zone, txhdr); 2388 } 2389 2390 if (virtqueue_empty(vq)) 2391 txq->vtntx_watchdog = 0; 2392 } 2393 2394 static void 2395 vtnet_tx_vq_intr(void *xtxq) 2396 { 2397 struct vtnet_softc *sc; 2398 struct vtnet_txq *txq; 2399 struct ifnet *ifp; 2400 int tries; 2401 2402 txq = xtxq; 2403 sc = txq->vtntx_sc; 2404 ifp = sc->vtnet_ifp; 2405 tries = 0; 2406 2407 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2408 /* 2409 * Ignore this interrupt. Either this is a spurious interrupt 2410 * or multiqueue without per-VQ MSIX so every queue needs to 2411 * be polled (a brain dead configuration we could try harder 2412 * to avoid). 2413 */ 2414 vtnet_txq_disable_intr(txq); 2415 return; 2416 } 2417 2418 VTNET_TXQ_LOCK(txq); 2419 2420 again: 2421 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2422 VTNET_TXQ_UNLOCK(txq); 2423 return; 2424 } 2425 2426 vtnet_txq_eof(txq); 2427 2428 vtnet_txq_start(txq); 2429 2430 if (vtnet_txq_enable_intr(txq) != 0) { 2431 vtnet_txq_disable_intr(txq); 2432 /* 2433 * This is an occasional race, so retry a few times 2434 * before scheduling the taskqueue. 2435 */ 2436 if (tries++ < VTNET_INTR_DISABLE_RETRIES) 2437 goto again; 2438 2439 VTNET_TXQ_UNLOCK(txq); 2440 txq->vtntx_stats.vtxs_rescheduled++; 2441 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2442 } else 2443 VTNET_TXQ_UNLOCK(txq); 2444 } 2445 2446 static void 2447 vtnet_tx_start_all(struct vtnet_softc *sc) 2448 { 2449 struct vtnet_txq *txq; 2450 int i; 2451 2452 VTNET_CORE_LOCK_ASSERT(sc); 2453 2454 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2455 txq = &sc->vtnet_txqs[i]; 2456 2457 VTNET_TXQ_LOCK(txq); 2458 vtnet_txq_start(txq); 2459 VTNET_TXQ_UNLOCK(txq); 2460 } 2461 } 2462 2463 #ifndef VTNET_LEGACY_TX 2464 static void 2465 vtnet_qflush(struct ifnet *ifp) 2466 { 2467 struct vtnet_softc *sc; 2468 struct vtnet_txq *txq; 2469 struct mbuf *m; 2470 int i; 2471 2472 sc = ifp->if_softc; 2473 2474 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2475 txq = &sc->vtnet_txqs[i]; 2476 2477 VTNET_TXQ_LOCK(txq); 2478 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2479 m_freem(m); 2480 VTNET_TXQ_UNLOCK(txq); 2481 } 2482 2483 if_qflush(ifp); 2484 } 2485 #endif 2486 2487 static int 2488 vtnet_watchdog(struct vtnet_txq *txq) 2489 { 2490 struct vtnet_softc *sc; 2491 2492 sc = txq->vtntx_sc; 2493 2494 VTNET_TXQ_LOCK(txq); 2495 if (sc->vtnet_flags & VTNET_FLAG_EVENT_IDX) 2496 vtnet_txq_eof(txq); 2497 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2498 VTNET_TXQ_UNLOCK(txq); 2499 return (0); 2500 } 2501 VTNET_TXQ_UNLOCK(txq); 2502 2503 if_printf(sc->vtnet_ifp, "watchdog timeout on queue %d\n", 2504 txq->vtntx_id); 2505 return (1); 2506 } 2507 2508 static void 2509 vtnet_rxq_accum_stats(struct vtnet_rxq *rxq, struct vtnet_rxq_stats *accum) 2510 { 2511 struct vtnet_rxq_stats *st; 2512 2513 st = &rxq->vtnrx_stats; 2514 2515 accum->vrxs_ipackets += st->vrxs_ipackets; 2516 accum->vrxs_ibytes += st->vrxs_ibytes; 2517 accum->vrxs_iqdrops += st->vrxs_iqdrops; 2518 accum->vrxs_csum += st->vrxs_csum; 2519 accum->vrxs_csum_failed += st->vrxs_csum_failed; 2520 accum->vrxs_rescheduled += st->vrxs_rescheduled; 2521 } 2522 2523 static void 2524 vtnet_txq_accum_stats(struct vtnet_txq *txq, struct vtnet_txq_stats *accum) 2525 { 2526 struct vtnet_txq_stats *st; 2527 2528 st = &txq->vtntx_stats; 2529 2530 accum->vtxs_opackets += st->vtxs_opackets; 2531 accum->vtxs_obytes += st->vtxs_obytes; 2532 accum->vtxs_csum += st->vtxs_csum; 2533 accum->vtxs_tso += st->vtxs_tso; 2534 accum->vtxs_collapsed += st->vtxs_collapsed; 2535 accum->vtxs_rescheduled += st->vtxs_rescheduled; 2536 } 2537 2538 static void 2539 vtnet_accumulate_stats(struct vtnet_softc *sc) 2540 { 2541 struct ifnet *ifp; 2542 struct vtnet_statistics *st; 2543 struct vtnet_rxq_stats rxaccum; 2544 struct vtnet_txq_stats txaccum; 2545 int i; 2546 2547 ifp = sc->vtnet_ifp; 2548 st = &sc->vtnet_stats; 2549 bzero(&rxaccum, sizeof(struct vtnet_rxq_stats)); 2550 bzero(&txaccum, sizeof(struct vtnet_txq_stats)); 2551 2552 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2553 vtnet_rxq_accum_stats(&sc->vtnet_rxqs[i], &rxaccum); 2554 vtnet_txq_accum_stats(&sc->vtnet_txqs[i], &txaccum); 2555 } 2556 2557 st->rx_csum_offloaded = rxaccum.vrxs_csum; 2558 st->rx_csum_failed = rxaccum.vrxs_csum_failed; 2559 st->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 2560 st->tx_csum_offloaded = txaccum.vtxs_csum; 2561 st->tx_tso_offloaded = txaccum.vtxs_tso; 2562 st->tx_task_rescheduled = txaccum.vtxs_rescheduled; 2563 2564 /* 2565 * With the exception of if_ierrors, these ifnet statistics are 2566 * only updated in the driver, so just set them to our accumulated 2567 * values. if_ierrors is updated in ether_input() for malformed 2568 * frames that we should have already discarded. 2569 */ 2570 ifp->if_ipackets = rxaccum.vrxs_ipackets; 2571 ifp->if_iqdrops = rxaccum.vrxs_iqdrops; 2572 ifp->if_ierrors = rxaccum.vrxs_ierrors; 2573 ifp->if_opackets = txaccum.vtxs_opackets; 2574 #ifndef VTNET_LEGACY_TX 2575 ifp->if_obytes = txaccum.vtxs_obytes; 2576 ifp->if_omcasts = txaccum.vtxs_omcasts; 2577 #endif 2578 } 2579 2580 static void 2581 vtnet_tick(void *xsc) 2582 { 2583 struct vtnet_softc *sc; 2584 struct ifnet *ifp; 2585 int i, timedout; 2586 2587 sc = xsc; 2588 ifp = sc->vtnet_ifp; 2589 timedout = 0; 2590 2591 VTNET_CORE_LOCK_ASSERT(sc); 2592 vtnet_accumulate_stats(sc); 2593 2594 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 2595 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 2596 2597 if (timedout != 0) { 2598 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2599 vtnet_init_locked(sc); 2600 } else 2601 callout_schedule(&sc->vtnet_tick_ch, hz); 2602 } 2603 2604 static void 2605 vtnet_start_taskqueues(struct vtnet_softc *sc) 2606 { 2607 device_t dev; 2608 struct vtnet_rxq *rxq; 2609 struct vtnet_txq *txq; 2610 int i, error; 2611 2612 dev = sc->vtnet_dev; 2613 2614 /* 2615 * Errors here are very difficult to recover from - we cannot 2616 * easily fail because, if this is during boot, we will hang 2617 * when freeing any successfully started taskqueues because 2618 * the scheduler isn't up yet. 2619 * 2620 * Most drivers just ignore the return value - it only fails 2621 * with ENOMEM so an error is not likely. 2622 */ 2623 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2624 rxq = &sc->vtnet_rxqs[i]; 2625 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 2626 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 2627 if (error) { 2628 device_printf(dev, "failed to start rx taskq %d\n", 2629 rxq->vtnrx_id); 2630 } 2631 2632 txq = &sc->vtnet_txqs[i]; 2633 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 2634 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 2635 if (error) { 2636 device_printf(dev, "failed to start tx taskq %d\n", 2637 txq->vtntx_id); 2638 } 2639 } 2640 } 2641 2642 static void 2643 vtnet_free_taskqueues(struct vtnet_softc *sc) 2644 { 2645 struct vtnet_rxq *rxq; 2646 struct vtnet_txq *txq; 2647 int i; 2648 2649 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2650 rxq = &sc->vtnet_rxqs[i]; 2651 if (rxq->vtnrx_tq != NULL) { 2652 taskqueue_free(rxq->vtnrx_tq); 2653 rxq->vtnrx_vq = NULL; 2654 } 2655 2656 txq = &sc->vtnet_txqs[i]; 2657 if (txq->vtntx_tq != NULL) { 2658 taskqueue_free(txq->vtntx_tq); 2659 txq->vtntx_tq = NULL; 2660 } 2661 } 2662 } 2663 2664 static void 2665 vtnet_drain_taskqueues(struct vtnet_softc *sc) 2666 { 2667 struct vtnet_rxq *rxq; 2668 struct vtnet_txq *txq; 2669 int i; 2670 2671 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2672 rxq = &sc->vtnet_rxqs[i]; 2673 if (rxq->vtnrx_tq != NULL) 2674 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2675 2676 txq = &sc->vtnet_txqs[i]; 2677 if (txq->vtntx_tq != NULL) { 2678 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 2679 #ifndef VTNET_LEGACY_TX 2680 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 2681 #endif 2682 } 2683 } 2684 } 2685 2686 static void 2687 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 2688 { 2689 struct vtnet_rxq *rxq; 2690 struct vtnet_txq *txq; 2691 int i; 2692 2693 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2694 rxq = &sc->vtnet_rxqs[i]; 2695 vtnet_rxq_free_mbufs(rxq); 2696 2697 txq = &sc->vtnet_txqs[i]; 2698 vtnet_txq_free_mbufs(txq); 2699 } 2700 } 2701 2702 static void 2703 vtnet_stop_rendezvous(struct vtnet_softc *sc) 2704 { 2705 struct vtnet_rxq *rxq; 2706 struct vtnet_txq *txq; 2707 int i; 2708 2709 /* 2710 * Lock and unlock the per-queue mutex so we known the stop 2711 * state is visible. Doing only the active queues should be 2712 * sufficient, but it does not cost much extra to do all the 2713 * queues. Note we hold the core mutex here too. 2714 */ 2715 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2716 rxq = &sc->vtnet_rxqs[i]; 2717 VTNET_RXQ_LOCK(rxq); 2718 VTNET_RXQ_UNLOCK(rxq); 2719 2720 txq = &sc->vtnet_txqs[i]; 2721 VTNET_TXQ_LOCK(txq); 2722 VTNET_TXQ_UNLOCK(txq); 2723 } 2724 } 2725 2726 static void 2727 vtnet_stop(struct vtnet_softc *sc) 2728 { 2729 device_t dev; 2730 struct ifnet *ifp; 2731 2732 dev = sc->vtnet_dev; 2733 ifp = sc->vtnet_ifp; 2734 2735 VTNET_CORE_LOCK_ASSERT(sc); 2736 2737 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2738 sc->vtnet_link_active = 0; 2739 callout_stop(&sc->vtnet_tick_ch); 2740 2741 /* Only advisory. */ 2742 vtnet_disable_interrupts(sc); 2743 2744 /* 2745 * Stop the host adapter. This resets it to the pre-initialized 2746 * state. It will not generate any interrupts until after it is 2747 * reinitialized. 2748 */ 2749 virtio_stop(dev); 2750 vtnet_stop_rendezvous(sc); 2751 2752 /* Free any mbufs left in the virtqueues. */ 2753 vtnet_drain_rxtx_queues(sc); 2754 } 2755 2756 static int 2757 vtnet_virtio_reinit(struct vtnet_softc *sc) 2758 { 2759 device_t dev; 2760 struct ifnet *ifp; 2761 uint64_t features; 2762 int mask, error; 2763 2764 dev = sc->vtnet_dev; 2765 ifp = sc->vtnet_ifp; 2766 features = sc->vtnet_features; 2767 2768 mask = 0; 2769 #if defined(INET) 2770 mask |= IFCAP_RXCSUM; 2771 #endif 2772 #if defined (INET6) 2773 mask |= IFCAP_RXCSUM_IPV6; 2774 #endif 2775 2776 /* 2777 * Re-negotiate with the host, removing any disabled receive 2778 * features. Transmit features are disabled only on our side 2779 * via if_capenable and if_hwassist. 2780 */ 2781 2782 if (ifp->if_capabilities & mask) { 2783 /* 2784 * We require both IPv4 and IPv6 offloading to be enabled 2785 * in order to negotiated it: VirtIO does not distinguish 2786 * between the two. 2787 */ 2788 if ((ifp->if_capenable & mask) != mask) 2789 features &= ~VIRTIO_NET_F_GUEST_CSUM; 2790 } 2791 2792 if (ifp->if_capabilities & IFCAP_LRO) { 2793 if ((ifp->if_capenable & IFCAP_LRO) == 0) 2794 features &= ~VTNET_LRO_FEATURES; 2795 } 2796 2797 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) { 2798 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 2799 features &= ~VIRTIO_NET_F_CTRL_VLAN; 2800 } 2801 2802 error = virtio_reinit(dev, features); 2803 if (error) 2804 device_printf(dev, "virtio reinit error %d\n", error); 2805 2806 return (error); 2807 } 2808 2809 static void 2810 vtnet_init_rx_filters(struct vtnet_softc *sc) 2811 { 2812 struct ifnet *ifp; 2813 2814 ifp = sc->vtnet_ifp; 2815 2816 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 2817 /* Restore promiscuous and all-multicast modes. */ 2818 vtnet_rx_filter(sc); 2819 /* Restore filtered MAC addresses. */ 2820 vtnet_rx_filter_mac(sc); 2821 } 2822 2823 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 2824 vtnet_rx_filter_vlan(sc); 2825 } 2826 2827 static int 2828 vtnet_init_rx_queues(struct vtnet_softc *sc) 2829 { 2830 device_t dev; 2831 struct vtnet_rxq *rxq; 2832 int i, clsize, error; 2833 2834 dev = sc->vtnet_dev; 2835 2836 /* 2837 * Use the new cluster size if one has been set (via a MTU 2838 * change). Otherwise, use the standard 2K clusters. 2839 * 2840 * BMV: It might make sense to use page sized clusters as 2841 * the default (depending on the features negotiated). 2842 */ 2843 if (sc->vtnet_rx_new_clsize != 0) { 2844 clsize = sc->vtnet_rx_new_clsize; 2845 sc->vtnet_rx_new_clsize = 0; 2846 } else 2847 clsize = MCLBYTES; 2848 2849 sc->vtnet_rx_clsize = clsize; 2850 sc->vtnet_rx_nmbufs = VTNET_NEEDED_RX_MBUFS(sc, clsize); 2851 2852 /* The first segment is reserved for the header. */ 2853 KASSERT(sc->vtnet_rx_nmbufs < VTNET_MAX_RX_SEGS, 2854 ("%s: too many rx mbufs %d", __func__, sc->vtnet_rx_nmbufs)); 2855 2856 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2857 rxq = &sc->vtnet_rxqs[i]; 2858 2859 /* Hold the lock to satisfy asserts. */ 2860 VTNET_RXQ_LOCK(rxq); 2861 error = vtnet_rxq_populate(rxq); 2862 VTNET_RXQ_UNLOCK(rxq); 2863 2864 if (error) { 2865 device_printf(dev, 2866 "cannot allocate mbufs for Rx queue %d\n", i); 2867 return (error); 2868 } 2869 } 2870 2871 return (0); 2872 } 2873 2874 static int 2875 vtnet_init_tx_queues(struct vtnet_softc *sc) 2876 { 2877 struct vtnet_txq *txq; 2878 int i; 2879 2880 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2881 txq = &sc->vtnet_txqs[i]; 2882 txq->vtntx_watchdog = 0; 2883 } 2884 2885 return (0); 2886 } 2887 2888 static int 2889 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 2890 { 2891 int error; 2892 2893 error = vtnet_init_rx_queues(sc); 2894 if (error) 2895 return (error); 2896 2897 error = vtnet_init_tx_queues(sc); 2898 if (error) 2899 return (error); 2900 2901 return (0); 2902 } 2903 2904 static void 2905 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 2906 { 2907 device_t dev; 2908 int npairs; 2909 2910 dev = sc->vtnet_dev; 2911 2912 if ((sc->vtnet_flags & VTNET_FLAG_MULTIQ) == 0) { 2913 MPASS(sc->vtnet_max_vq_pairs == 1); 2914 sc->vtnet_act_vq_pairs = 1; 2915 return; 2916 } 2917 2918 /* BMV: Just use the maximum configured for now. */ 2919 npairs = sc->vtnet_max_vq_pairs; 2920 2921 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 2922 device_printf(dev, 2923 "cannot set active queue pairs to %d\n", npairs); 2924 npairs = 1; 2925 } 2926 2927 sc->vtnet_act_vq_pairs = npairs; 2928 } 2929 2930 static int 2931 vtnet_reinit(struct vtnet_softc *sc) 2932 { 2933 device_t dev; 2934 struct ifnet *ifp; 2935 int error; 2936 2937 dev = sc->vtnet_dev; 2938 ifp = sc->vtnet_ifp; 2939 2940 /* Use the current MAC address. */ 2941 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 2942 vtnet_set_hwaddr(sc); 2943 2944 vtnet_set_active_vq_pairs(sc); 2945 2946 ifp->if_hwassist = 0; 2947 if (ifp->if_capenable & IFCAP_TXCSUM) 2948 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 2949 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 2950 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 2951 if (ifp->if_capenable & IFCAP_TSO4) 2952 ifp->if_hwassist |= CSUM_TSO; 2953 if (ifp->if_capenable & IFCAP_TSO6) 2954 ifp->if_hwassist |= CSUM_TSO; /* No CSUM_TSO_IPV6. */ 2955 2956 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 2957 vtnet_init_rx_filters(sc); 2958 2959 error = vtnet_init_rxtx_queues(sc); 2960 if (error) 2961 return (error); 2962 2963 vtnet_enable_interrupts(sc); 2964 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2965 2966 return (0); 2967 } 2968 2969 static void 2970 vtnet_init_locked(struct vtnet_softc *sc) 2971 { 2972 device_t dev; 2973 struct ifnet *ifp; 2974 2975 dev = sc->vtnet_dev; 2976 ifp = sc->vtnet_ifp; 2977 2978 VTNET_CORE_LOCK_ASSERT(sc); 2979 2980 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2981 return; 2982 2983 vtnet_stop(sc); 2984 2985 /* Reinitialize with the host. */ 2986 if (vtnet_virtio_reinit(sc) != 0) 2987 goto fail; 2988 2989 if (vtnet_reinit(sc) != 0) 2990 goto fail; 2991 2992 virtio_reinit_complete(dev); 2993 2994 vtnet_update_link_status(sc); 2995 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 2996 2997 return; 2998 2999 fail: 3000 vtnet_stop(sc); 3001 } 3002 3003 static void 3004 vtnet_init(void *xsc) 3005 { 3006 struct vtnet_softc *sc; 3007 3008 sc = xsc; 3009 3010 VTNET_CORE_LOCK(sc); 3011 vtnet_init_locked(sc); 3012 VTNET_CORE_UNLOCK(sc); 3013 } 3014 3015 static void 3016 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3017 { 3018 struct virtqueue *vq; 3019 3020 vq = sc->vtnet_ctrl_vq; 3021 3022 /* 3023 * The control virtqueue is only polled and therefore it should 3024 * already be empty. 3025 */ 3026 KASSERT(virtqueue_empty(vq), 3027 ("%s: ctrl vq %p not empty", __func__, vq)); 3028 } 3029 3030 static void 3031 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3032 struct sglist *sg, int readable, int writable) 3033 { 3034 struct virtqueue *vq; 3035 3036 vq = sc->vtnet_ctrl_vq; 3037 3038 VTNET_CORE_LOCK_ASSERT(sc); 3039 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ, 3040 ("%s: CTRL_VQ feature not negotiated", __func__)); 3041 3042 if (!virtqueue_empty(vq)) 3043 return; 3044 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0) 3045 return; 3046 3047 /* 3048 * Poll for the response, but the command is likely already 3049 * done when we return from the notify. 3050 */ 3051 virtqueue_notify(vq); 3052 virtqueue_poll(vq, NULL); 3053 } 3054 3055 static int 3056 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3057 { 3058 struct virtio_net_ctrl_hdr hdr; 3059 struct sglist_seg segs[3]; 3060 struct sglist sg; 3061 uint8_t ack; 3062 int error; 3063 3064 hdr.class = VIRTIO_NET_CTRL_MAC; 3065 hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3066 ack = VIRTIO_NET_ERR; 3067 3068 sglist_init(&sg, 3, segs); 3069 error = 0; 3070 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3071 error |= sglist_append(&sg, hwaddr, ETHER_ADDR_LEN); 3072 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3073 KASSERT(error == 0 && sg.sg_nseg == 3, 3074 ("%s: error %d adding set MAC msg to sglist", __func__, error)); 3075 3076 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3077 3078 return (ack == VIRTIO_NET_OK ? 0 : EIO); 3079 } 3080 3081 static int 3082 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3083 { 3084 struct sglist_seg segs[3]; 3085 struct sglist sg; 3086 struct { 3087 struct virtio_net_ctrl_hdr hdr; 3088 uint8_t pad1; 3089 struct virtio_net_ctrl_mq mq; 3090 uint8_t pad2; 3091 uint8_t ack; 3092 } s; 3093 int error; 3094 3095 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3096 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3097 s.mq.virtqueue_pairs = npairs; 3098 s.ack = VIRTIO_NET_ERR; 3099 3100 sglist_init(&sg, 3, segs); 3101 error = 0; 3102 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3103 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3104 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3105 KASSERT(error == 0 && sg.sg_nseg == 3, 3106 ("%s: error %d adding MQ message to sglist", __func__, error)); 3107 3108 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3109 3110 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3111 } 3112 3113 static int 3114 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on) 3115 { 3116 struct sglist_seg segs[3]; 3117 struct sglist sg; 3118 struct { 3119 struct virtio_net_ctrl_hdr hdr; 3120 uint8_t pad1; 3121 uint8_t onoff; 3122 uint8_t pad2; 3123 uint8_t ack; 3124 } s; 3125 int error; 3126 3127 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3128 ("%s: CTRL_RX feature not negotiated", __func__)); 3129 3130 s.hdr.class = VIRTIO_NET_CTRL_RX; 3131 s.hdr.cmd = cmd; 3132 s.onoff = !!on; 3133 s.ack = VIRTIO_NET_ERR; 3134 3135 sglist_init(&sg, 3, segs); 3136 error = 0; 3137 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3138 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3139 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3140 KASSERT(error == 0 && sg.sg_nseg == 3, 3141 ("%s: error %d adding Rx message to sglist", __func__, error)); 3142 3143 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3144 3145 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3146 } 3147 3148 static int 3149 vtnet_set_promisc(struct vtnet_softc *sc, int on) 3150 { 3151 3152 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3153 } 3154 3155 static int 3156 vtnet_set_allmulti(struct vtnet_softc *sc, int on) 3157 { 3158 3159 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3160 } 3161 3162 /* 3163 * The device defaults to promiscuous mode for backwards compatibility. 3164 * Turn it off at attach time if possible. 3165 */ 3166 static void 3167 vtnet_attach_disable_promisc(struct vtnet_softc *sc) 3168 { 3169 struct ifnet *ifp; 3170 3171 ifp = sc->vtnet_ifp; 3172 3173 VTNET_CORE_LOCK(sc); 3174 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) { 3175 ifp->if_flags |= IFF_PROMISC; 3176 } else if (vtnet_set_promisc(sc, 0) != 0) { 3177 ifp->if_flags |= IFF_PROMISC; 3178 device_printf(sc->vtnet_dev, 3179 "cannot disable default promiscuous mode\n"); 3180 } 3181 VTNET_CORE_UNLOCK(sc); 3182 } 3183 3184 static void 3185 vtnet_rx_filter(struct vtnet_softc *sc) 3186 { 3187 device_t dev; 3188 struct ifnet *ifp; 3189 3190 dev = sc->vtnet_dev; 3191 ifp = sc->vtnet_ifp; 3192 3193 VTNET_CORE_LOCK_ASSERT(sc); 3194 3195 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) 3196 device_printf(dev, "cannot %s promiscuous mode\n", 3197 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3198 3199 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) 3200 device_printf(dev, "cannot %s all-multicast mode\n", 3201 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3202 } 3203 3204 static void 3205 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3206 { 3207 struct virtio_net_ctrl_hdr hdr; 3208 struct vtnet_mac_filter *filter; 3209 struct sglist_seg segs[4]; 3210 struct sglist sg; 3211 struct ifnet *ifp; 3212 struct ifaddr *ifa; 3213 struct ifmultiaddr *ifma; 3214 int ucnt, mcnt, promisc, allmulti, error; 3215 uint8_t ack; 3216 3217 ifp = sc->vtnet_ifp; 3218 filter = sc->vtnet_mac_filter; 3219 ucnt = 0; 3220 mcnt = 0; 3221 promisc = 0; 3222 allmulti = 0; 3223 3224 VTNET_CORE_LOCK_ASSERT(sc); 3225 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3226 ("%s: CTRL_RX feature not negotiated", __func__)); 3227 3228 /* Unicast MAC addresses: */ 3229 if_addr_rlock(ifp); 3230 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3231 if (ifa->ifa_addr->sa_family != AF_LINK) 3232 continue; 3233 else if (memcmp(LLADDR((struct sockaddr_dl *)ifa->ifa_addr), 3234 sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3235 continue; 3236 else if (ucnt == VTNET_MAX_MAC_ENTRIES) { 3237 promisc = 1; 3238 break; 3239 } 3240 3241 bcopy(LLADDR((struct sockaddr_dl *)ifa->ifa_addr), 3242 &filter->vmf_unicast.macs[ucnt], ETHER_ADDR_LEN); 3243 ucnt++; 3244 } 3245 if_addr_runlock(ifp); 3246 3247 if (promisc != 0) { 3248 filter->vmf_unicast.nentries = 0; 3249 if_printf(ifp, "more than %d MAC addresses assigned, " 3250 "falling back to promiscuous mode\n", 3251 VTNET_MAX_MAC_ENTRIES); 3252 } else 3253 filter->vmf_unicast.nentries = ucnt; 3254 3255 /* Multicast MAC addresses: */ 3256 if_maddr_rlock(ifp); 3257 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3258 if (ifma->ifma_addr->sa_family != AF_LINK) 3259 continue; 3260 else if (mcnt == VTNET_MAX_MAC_ENTRIES) { 3261 allmulti = 1; 3262 break; 3263 } 3264 3265 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 3266 &filter->vmf_multicast.macs[mcnt], ETHER_ADDR_LEN); 3267 mcnt++; 3268 } 3269 if_maddr_runlock(ifp); 3270 3271 if (allmulti != 0) { 3272 filter->vmf_multicast.nentries = 0; 3273 if_printf(ifp, "more than %d multicast MAC addresses " 3274 "assigned, falling back to all-multicast mode\n", 3275 VTNET_MAX_MAC_ENTRIES); 3276 } else 3277 filter->vmf_multicast.nentries = mcnt; 3278 3279 if (promisc != 0 && allmulti != 0) 3280 goto out; 3281 3282 hdr.class = VIRTIO_NET_CTRL_MAC; 3283 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3284 ack = VIRTIO_NET_ERR; 3285 3286 sglist_init(&sg, 4, segs); 3287 error = 0; 3288 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3289 error |= sglist_append(&sg, &filter->vmf_unicast, 3290 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN); 3291 error |= sglist_append(&sg, &filter->vmf_multicast, 3292 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN); 3293 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3294 KASSERT(error == 0 && sg.sg_nseg == 4, 3295 ("%s: error %d adding MAC filter msg to sglist", __func__, error)); 3296 3297 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3298 3299 if (ack != VIRTIO_NET_OK) 3300 if_printf(ifp, "error setting host MAC filter table\n"); 3301 3302 out: 3303 if (promisc != 0 && vtnet_set_promisc(sc, 1) != 0) 3304 if_printf(ifp, "cannot enable promiscuous mode\n"); 3305 if (allmulti != 0 && vtnet_set_allmulti(sc, 1) != 0) 3306 if_printf(ifp, "cannot enable all-multicast mode\n"); 3307 } 3308 3309 static int 3310 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3311 { 3312 struct sglist_seg segs[3]; 3313 struct sglist sg; 3314 struct { 3315 struct virtio_net_ctrl_hdr hdr; 3316 uint8_t pad1; 3317 uint16_t tag; 3318 uint8_t pad2; 3319 uint8_t ack; 3320 } s; 3321 int error; 3322 3323 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3324 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3325 s.tag = tag; 3326 s.ack = VIRTIO_NET_ERR; 3327 3328 sglist_init(&sg, 3, segs); 3329 error = 0; 3330 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3331 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3332 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3333 KASSERT(error == 0 && sg.sg_nseg == 3, 3334 ("%s: error %d adding VLAN message to sglist", __func__, error)); 3335 3336 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3337 3338 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3339 } 3340 3341 static void 3342 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3343 { 3344 uint32_t w; 3345 uint16_t tag; 3346 int i, bit; 3347 3348 VTNET_CORE_LOCK_ASSERT(sc); 3349 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 3350 ("%s: VLAN_FILTER feature not negotiated", __func__)); 3351 3352 /* Enable the filter for each configured VLAN. */ 3353 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3354 w = sc->vtnet_vlan_filter[i]; 3355 3356 while ((bit = ffs(w) - 1) != -1) { 3357 w &= ~(1 << bit); 3358 tag = sizeof(w) * CHAR_BIT * i + bit; 3359 3360 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3361 device_printf(sc->vtnet_dev, 3362 "cannot enable VLAN %d filter\n", tag); 3363 } 3364 } 3365 } 3366 } 3367 3368 static void 3369 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3370 { 3371 struct ifnet *ifp; 3372 int idx, bit; 3373 3374 ifp = sc->vtnet_ifp; 3375 idx = (tag >> 5) & 0x7F; 3376 bit = tag & 0x1F; 3377 3378 if (tag == 0 || tag > 4095) 3379 return; 3380 3381 VTNET_CORE_LOCK(sc); 3382 3383 if (add) 3384 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3385 else 3386 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3387 3388 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3389 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3390 device_printf(sc->vtnet_dev, 3391 "cannot %s VLAN %d %s the host filter table\n", 3392 add ? "add" : "remove", tag, add ? "to" : "from"); 3393 } 3394 3395 VTNET_CORE_UNLOCK(sc); 3396 } 3397 3398 static void 3399 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3400 { 3401 3402 if (ifp->if_softc != arg) 3403 return; 3404 3405 vtnet_update_vlan_filter(arg, 1, tag); 3406 } 3407 3408 static void 3409 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3410 { 3411 3412 if (ifp->if_softc != arg) 3413 return; 3414 3415 vtnet_update_vlan_filter(arg, 0, tag); 3416 } 3417 3418 static int 3419 vtnet_is_link_up(struct vtnet_softc *sc) 3420 { 3421 device_t dev; 3422 struct ifnet *ifp; 3423 uint16_t status; 3424 3425 dev = sc->vtnet_dev; 3426 ifp = sc->vtnet_ifp; 3427 3428 if ((ifp->if_capabilities & IFCAP_LINKSTATE) == 0) 3429 status = VIRTIO_NET_S_LINK_UP; 3430 else 3431 status = virtio_read_dev_config_2(dev, 3432 offsetof(struct virtio_net_config, status)); 3433 3434 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3435 } 3436 3437 static void 3438 vtnet_update_link_status(struct vtnet_softc *sc) 3439 { 3440 struct ifnet *ifp; 3441 int link; 3442 3443 ifp = sc->vtnet_ifp; 3444 3445 VTNET_CORE_LOCK_ASSERT(sc); 3446 link = vtnet_is_link_up(sc); 3447 3448 /* Notify if the link status has changed. */ 3449 if (link != 0 && sc->vtnet_link_active == 0) { 3450 sc->vtnet_link_active = 1; 3451 if_link_state_change(ifp, LINK_STATE_UP); 3452 } else if (link == 0 && sc->vtnet_link_active != 0) { 3453 sc->vtnet_link_active = 0; 3454 if_link_state_change(ifp, LINK_STATE_DOWN); 3455 } 3456 } 3457 3458 static int 3459 vtnet_ifmedia_upd(struct ifnet *ifp) 3460 { 3461 struct vtnet_softc *sc; 3462 struct ifmedia *ifm; 3463 3464 sc = ifp->if_softc; 3465 ifm = &sc->vtnet_media; 3466 3467 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) 3468 return (EINVAL); 3469 3470 return (0); 3471 } 3472 3473 static void 3474 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3475 { 3476 struct vtnet_softc *sc; 3477 3478 sc = ifp->if_softc; 3479 3480 ifmr->ifm_status = IFM_AVALID; 3481 ifmr->ifm_active = IFM_ETHER; 3482 3483 VTNET_CORE_LOCK(sc); 3484 if (vtnet_is_link_up(sc) != 0) { 3485 ifmr->ifm_status |= IFM_ACTIVE; 3486 ifmr->ifm_active |= VTNET_MEDIATYPE; 3487 } else 3488 ifmr->ifm_active |= IFM_NONE; 3489 VTNET_CORE_UNLOCK(sc); 3490 } 3491 3492 static void 3493 vtnet_set_hwaddr(struct vtnet_softc *sc) 3494 { 3495 device_t dev; 3496 int i; 3497 3498 dev = sc->vtnet_dev; 3499 3500 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 3501 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0) 3502 device_printf(dev, "unable to set MAC address\n"); 3503 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3504 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3505 virtio_write_dev_config_1(dev, 3506 offsetof(struct virtio_net_config, mac) + i, 3507 sc->vtnet_hwaddr[i]); 3508 } 3509 } 3510 } 3511 3512 static void 3513 vtnet_get_hwaddr(struct vtnet_softc *sc) 3514 { 3515 device_t dev; 3516 int i; 3517 3518 dev = sc->vtnet_dev; 3519 3520 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) { 3521 /* 3522 * Generate a random locally administered unicast address. 3523 * 3524 * It would be nice to generate the same MAC address across 3525 * reboots, but it seems all the hosts currently available 3526 * support the MAC feature, so this isn't too important. 3527 */ 3528 sc->vtnet_hwaddr[0] = 0xB2; 3529 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3530 vtnet_set_hwaddr(sc); 3531 return; 3532 } 3533 3534 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3535 sc->vtnet_hwaddr[i] = virtio_read_dev_config_1(dev, 3536 offsetof(struct virtio_net_config, mac) + i); 3537 } 3538 } 3539 3540 static void 3541 vtnet_vlan_tag_remove(struct mbuf *m) 3542 { 3543 struct ether_vlan_header *evh; 3544 3545 evh = mtod(m, struct ether_vlan_header *); 3546 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 3547 m->m_flags |= M_VLANTAG; 3548 3549 /* Strip the 802.1Q header. */ 3550 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 3551 ETHER_HDR_LEN - ETHER_TYPE_LEN); 3552 m_adj(m, ETHER_VLAN_ENCAP_LEN); 3553 } 3554 3555 static void 3556 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 3557 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 3558 { 3559 struct sysctl_oid *node; 3560 struct sysctl_oid_list *list; 3561 struct vtnet_rxq_stats *stats; 3562 char namebuf[16]; 3563 3564 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 3565 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3566 CTLFLAG_RD, NULL, "Receive Queue"); 3567 list = SYSCTL_CHILDREN(node); 3568 3569 stats = &rxq->vtnrx_stats; 3570 3571 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 3572 &stats->vrxs_ipackets, "Receive packets"); 3573 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 3574 &stats->vrxs_ibytes, "Receive bytes"); 3575 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 3576 &stats->vrxs_iqdrops, "Receive drops"); 3577 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 3578 &stats->vrxs_ierrors, "Receive errors"); 3579 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3580 &stats->vrxs_csum, "Receive checksum offloaded"); 3581 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 3582 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 3583 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3584 &stats->vrxs_rescheduled, 3585 "Receive interrupt handler rescheduled"); 3586 } 3587 3588 static void 3589 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 3590 struct sysctl_oid_list *child, struct vtnet_txq *txq) 3591 { 3592 struct sysctl_oid *node; 3593 struct sysctl_oid_list *list; 3594 struct vtnet_txq_stats *stats; 3595 char namebuf[16]; 3596 3597 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 3598 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3599 CTLFLAG_RD, NULL, "Transmit Queue"); 3600 list = SYSCTL_CHILDREN(node); 3601 3602 stats = &txq->vtntx_stats; 3603 3604 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 3605 &stats->vtxs_opackets, "Transmit packets"); 3606 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 3607 &stats->vtxs_obytes, "Transmit bytes"); 3608 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 3609 &stats->vtxs_omcasts, "Transmit multicasts"); 3610 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3611 &stats->vtxs_csum, "Transmit checksum offloaded"); 3612 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 3613 &stats->vtxs_tso, "Transmit segmentation offloaded"); 3614 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "collapsed", CTLFLAG_RD, 3615 &stats->vtxs_collapsed, "Transmit mbufs collapsed"); 3616 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3617 &stats->vtxs_rescheduled, 3618 "Transmit interrupt handler rescheduled"); 3619 } 3620 3621 static void 3622 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 3623 { 3624 device_t dev; 3625 struct sysctl_ctx_list *ctx; 3626 struct sysctl_oid *tree; 3627 struct sysctl_oid_list *child; 3628 int i; 3629 3630 dev = sc->vtnet_dev; 3631 ctx = device_get_sysctl_ctx(dev); 3632 tree = device_get_sysctl_tree(dev); 3633 child = SYSCTL_CHILDREN(tree); 3634 3635 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3636 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 3637 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 3638 } 3639 } 3640 3641 static void 3642 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 3643 struct sysctl_oid_list *child, struct vtnet_softc *sc) 3644 { 3645 struct vtnet_statistics *stats; 3646 3647 stats = &sc->vtnet_stats; 3648 3649 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 3650 CTLFLAG_RD, &stats->mbuf_alloc_failed, 3651 "Mbuf cluster allocation failures"); 3652 3653 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 3654 CTLFLAG_RD, &stats->rx_frame_too_large, 3655 "Received frame larger than the mbuf chain"); 3656 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 3657 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 3658 "Enqueuing the replacement receive mbuf failed"); 3659 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 3660 CTLFLAG_RD, &stats->rx_mergeable_failed, 3661 "Mergeable buffers receive failures"); 3662 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 3663 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 3664 "Received checksum offloaded buffer with unsupported " 3665 "Ethernet type"); 3666 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 3667 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 3668 "Received checksum offloaded buffer with incorrect IP protocol"); 3669 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 3670 CTLFLAG_RD, &stats->rx_csum_bad_offset, 3671 "Received checksum offloaded buffer with incorrect offset"); 3672 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 3673 CTLFLAG_RD, &stats->rx_csum_bad_proto, 3674 "Received checksum offloaded buffer with incorrect protocol"); 3675 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 3676 CTLFLAG_RD, &stats->rx_csum_failed, 3677 "Received buffer checksum offload failed"); 3678 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 3679 CTLFLAG_RD, &stats->rx_csum_offloaded, 3680 "Received buffer checksum offload succeeded"); 3681 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 3682 CTLFLAG_RD, &stats->rx_task_rescheduled, 3683 "Times the receive interrupt task rescheduled itself"); 3684 3685 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_bad_ethtype", 3686 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 3687 "Aborted transmit of checksum offloaded buffer with unknown " 3688 "Ethernet type"); 3689 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_bad_ethtype", 3690 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 3691 "Aborted transmit of TSO buffer with unknown Ethernet type"); 3692 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 3693 CTLFLAG_RD, &stats->tx_tso_not_tcp, 3694 "Aborted transmit of TSO buffer with non TCP protocol"); 3695 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 3696 CTLFLAG_RD, &stats->tx_csum_offloaded, 3697 "Offloaded checksum of transmitted buffer"); 3698 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 3699 CTLFLAG_RD, &stats->tx_tso_offloaded, 3700 "Segmentation offload of transmitted buffer"); 3701 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 3702 CTLFLAG_RD, &stats->tx_task_rescheduled, 3703 "Times the transmit interrupt task rescheduled itself"); 3704 } 3705 3706 static void 3707 vtnet_setup_sysctl(struct vtnet_softc *sc) 3708 { 3709 device_t dev; 3710 struct sysctl_ctx_list *ctx; 3711 struct sysctl_oid *tree; 3712 struct sysctl_oid_list *child; 3713 3714 dev = sc->vtnet_dev; 3715 ctx = device_get_sysctl_ctx(dev); 3716 tree = device_get_sysctl_tree(dev); 3717 child = SYSCTL_CHILDREN(tree); 3718 3719 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 3720 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 3721 "Maximum number of supported virtqueue pairs"); 3722 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 3723 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 3724 "Number of active virtqueue pairs"); 3725 3726 vtnet_setup_stat_sysctl(ctx, child, sc); 3727 } 3728 3729 static int 3730 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 3731 { 3732 3733 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 3734 } 3735 3736 static void 3737 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 3738 { 3739 3740 virtqueue_disable_intr(rxq->vtnrx_vq); 3741 } 3742 3743 static int 3744 vtnet_txq_enable_intr(struct vtnet_txq *txq) 3745 { 3746 3747 return (virtqueue_postpone_intr(txq->vtntx_vq, VQ_POSTPONE_LONG)); 3748 } 3749 3750 static void 3751 vtnet_txq_disable_intr(struct vtnet_txq *txq) 3752 { 3753 3754 virtqueue_disable_intr(txq->vtntx_vq); 3755 } 3756 3757 static void 3758 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 3759 { 3760 int i; 3761 3762 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3763 vtnet_rxq_enable_intr(&sc->vtnet_rxqs[i]); 3764 } 3765 3766 static void 3767 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 3768 { 3769 int i; 3770 3771 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3772 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 3773 } 3774 3775 static void 3776 vtnet_enable_interrupts(struct vtnet_softc *sc) 3777 { 3778 3779 vtnet_enable_rx_interrupts(sc); 3780 vtnet_enable_tx_interrupts(sc); 3781 } 3782 3783 static void 3784 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 3785 { 3786 int i; 3787 3788 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3789 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 3790 } 3791 3792 static void 3793 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 3794 { 3795 int i; 3796 3797 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3798 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 3799 } 3800 3801 static void 3802 vtnet_disable_interrupts(struct vtnet_softc *sc) 3803 { 3804 3805 vtnet_disable_rx_interrupts(sc); 3806 vtnet_disable_tx_interrupts(sc); 3807 } 3808 3809 static int 3810 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 3811 { 3812 char path[64]; 3813 3814 snprintf(path, sizeof(path), 3815 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 3816 TUNABLE_INT_FETCH(path, &def); 3817 3818 return (def); 3819 } 3820