1 /*- 2 * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.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 #ifdef HAVE_KERNEL_OPTION_HEADERS 33 #include "opt_device_polling.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/sockio.h> 40 #include <sys/mbuf.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/taskqueue.h> 46 #include <sys/random.h> 47 #include <sys/sglist.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 51 #include <vm/uma.h> 52 53 #include <net/ethernet.h> 54 #include <net/if.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 <netinet/udp.h> 68 #include <netinet/tcp.h> 69 #include <netinet/sctp.h> 70 71 #include <machine/bus.h> 72 #include <machine/resource.h> 73 #include <sys/bus.h> 74 #include <sys/rman.h> 75 76 #include <dev/virtio/virtio.h> 77 #include <dev/virtio/virtqueue.h> 78 #include <dev/virtio/network/virtio_net.h> 79 #include <dev/virtio/network/if_vtnetvar.h> 80 81 #include "virtio_if.h" 82 83 static int vtnet_modevent(module_t, int, void *); 84 85 static int vtnet_probe(device_t); 86 static int vtnet_attach(device_t); 87 static int vtnet_detach(device_t); 88 static int vtnet_suspend(device_t); 89 static int vtnet_resume(device_t); 90 static int vtnet_shutdown(device_t); 91 static int vtnet_config_change(device_t); 92 93 static void vtnet_negotiate_features(struct vtnet_softc *); 94 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 95 static void vtnet_get_hwaddr(struct vtnet_softc *); 96 static void vtnet_set_hwaddr(struct vtnet_softc *); 97 static int vtnet_is_link_up(struct vtnet_softc *); 98 static void vtnet_update_link_status(struct vtnet_softc *); 99 static void vtnet_watchdog(struct vtnet_softc *); 100 static void vtnet_config_change_task(void *, int); 101 static int vtnet_change_mtu(struct vtnet_softc *, int); 102 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 103 104 static int vtnet_init_rx_vq(struct vtnet_softc *); 105 static void vtnet_free_rx_mbufs(struct vtnet_softc *); 106 static void vtnet_free_tx_mbufs(struct vtnet_softc *); 107 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 108 109 #ifdef DEVICE_POLLING 110 static poll_handler_t vtnet_poll; 111 #endif 112 113 static struct mbuf * vtnet_alloc_rxbuf(struct vtnet_softc *, int, 114 struct mbuf **); 115 static int vtnet_replace_rxbuf(struct vtnet_softc *, 116 struct mbuf *, int); 117 static int vtnet_newbuf(struct vtnet_softc *); 118 static void vtnet_discard_merged_rxbuf(struct vtnet_softc *, int); 119 static void vtnet_discard_rxbuf(struct vtnet_softc *, struct mbuf *); 120 static int vtnet_enqueue_rxbuf(struct vtnet_softc *, struct mbuf *); 121 static void vtnet_vlan_tag_remove(struct mbuf *); 122 static int vtnet_rx_csum(struct vtnet_softc *, struct mbuf *, 123 struct virtio_net_hdr *); 124 static int vtnet_rxeof_merged(struct vtnet_softc *, struct mbuf *, int); 125 static int vtnet_rxeof(struct vtnet_softc *, int, int *); 126 static void vtnet_rx_intr_task(void *, int); 127 static int vtnet_rx_vq_intr(void *); 128 129 static void vtnet_txeof(struct vtnet_softc *); 130 static struct mbuf * vtnet_tx_offload(struct vtnet_softc *, struct mbuf *, 131 struct virtio_net_hdr *); 132 static int vtnet_enqueue_txbuf(struct vtnet_softc *, struct mbuf **, 133 struct vtnet_tx_header *); 134 static int vtnet_encap(struct vtnet_softc *, struct mbuf **); 135 static void vtnet_start_locked(struct ifnet *); 136 static void vtnet_start(struct ifnet *); 137 static void vtnet_tick(void *); 138 static void vtnet_tx_intr_task(void *, int); 139 static int vtnet_tx_vq_intr(void *); 140 141 static void vtnet_stop(struct vtnet_softc *); 142 static int vtnet_reinit(struct vtnet_softc *); 143 static void vtnet_init_locked(struct vtnet_softc *); 144 static void vtnet_init(void *); 145 146 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 147 struct sglist *, int, int); 148 149 static void vtnet_rx_filter(struct vtnet_softc *sc); 150 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int); 151 static int vtnet_set_promisc(struct vtnet_softc *, int); 152 static int vtnet_set_allmulti(struct vtnet_softc *, int); 153 static void vtnet_rx_filter_mac(struct vtnet_softc *); 154 155 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 156 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 157 static void vtnet_set_vlan_filter(struct vtnet_softc *, int, uint16_t); 158 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 159 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 160 161 static int vtnet_ifmedia_upd(struct ifnet *); 162 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 163 164 static void vtnet_add_statistics(struct vtnet_softc *); 165 166 static int vtnet_enable_rx_intr(struct vtnet_softc *); 167 static int vtnet_enable_tx_intr(struct vtnet_softc *); 168 static void vtnet_disable_rx_intr(struct vtnet_softc *); 169 static void vtnet_disable_tx_intr(struct vtnet_softc *); 170 171 /* Tunables. */ 172 static int vtnet_csum_disable = 0; 173 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable); 174 static int vtnet_tso_disable = 0; 175 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable); 176 static int vtnet_lro_disable = 0; 177 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable); 178 179 /* 180 * Reducing the number of transmit completed interrupts can 181 * improve performance. To do so, the define below keeps the 182 * Tx vq interrupt disabled and adds calls to vtnet_txeof() 183 * in the start and watchdog paths. The price to pay for this 184 * is the m_free'ing of transmitted mbufs may be delayed until 185 * the watchdog fires. 186 */ 187 #define VTNET_TX_INTR_MODERATION 188 189 static uma_zone_t vtnet_tx_header_zone; 190 191 static struct virtio_feature_desc vtnet_feature_desc[] = { 192 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 193 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 194 { VIRTIO_NET_F_MAC, "MacAddress" }, 195 { VIRTIO_NET_F_GSO, "TxAllGSO" }, 196 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" }, 197 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" }, 198 { VIRTIO_NET_F_GUEST_ECN, "RxECN" }, 199 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 200 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 201 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 202 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 203 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 204 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 205 { VIRTIO_NET_F_STATUS, "Status" }, 206 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" }, 207 { VIRTIO_NET_F_CTRL_RX, "RxMode" }, 208 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" }, 209 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" }, 210 211 { 0, NULL } 212 }; 213 214 static device_method_t vtnet_methods[] = { 215 /* Device methods. */ 216 DEVMETHOD(device_probe, vtnet_probe), 217 DEVMETHOD(device_attach, vtnet_attach), 218 DEVMETHOD(device_detach, vtnet_detach), 219 DEVMETHOD(device_suspend, vtnet_suspend), 220 DEVMETHOD(device_resume, vtnet_resume), 221 DEVMETHOD(device_shutdown, vtnet_shutdown), 222 223 /* VirtIO methods. */ 224 DEVMETHOD(virtio_config_change, vtnet_config_change), 225 226 DEVMETHOD_END 227 }; 228 229 static driver_t vtnet_driver = { 230 "vtnet", 231 vtnet_methods, 232 sizeof(struct vtnet_softc) 233 }; 234 static devclass_t vtnet_devclass; 235 236 DRIVER_MODULE(vtnet, virtio_pci, vtnet_driver, vtnet_devclass, 237 vtnet_modevent, 0); 238 MODULE_VERSION(vtnet, 1); 239 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 240 241 static int 242 vtnet_modevent(module_t mod, int type, void *unused) 243 { 244 int error; 245 246 error = 0; 247 248 switch (type) { 249 case MOD_LOAD: 250 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 251 sizeof(struct vtnet_tx_header), 252 NULL, NULL, NULL, NULL, 0, 0); 253 break; 254 case MOD_QUIESCE: 255 case MOD_UNLOAD: 256 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 257 error = EBUSY; 258 else if (type == MOD_UNLOAD) { 259 uma_zdestroy(vtnet_tx_header_zone); 260 vtnet_tx_header_zone = NULL; 261 } 262 break; 263 case MOD_SHUTDOWN: 264 break; 265 default: 266 error = EOPNOTSUPP; 267 break; 268 } 269 270 return (error); 271 } 272 273 static int 274 vtnet_probe(device_t dev) 275 { 276 277 if (virtio_get_device_type(dev) != VIRTIO_ID_NETWORK) 278 return (ENXIO); 279 280 device_set_desc(dev, "VirtIO Networking Adapter"); 281 282 return (BUS_PROBE_DEFAULT); 283 } 284 285 static int 286 vtnet_attach(device_t dev) 287 { 288 struct vtnet_softc *sc; 289 struct ifnet *ifp; 290 int tx_size, error; 291 292 sc = device_get_softc(dev); 293 sc->vtnet_dev = dev; 294 295 VTNET_LOCK_INIT(sc); 296 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_MTX(sc), 0); 297 298 ifmedia_init(&sc->vtnet_media, IFM_IMASK, vtnet_ifmedia_upd, 299 vtnet_ifmedia_sts); 300 ifmedia_add(&sc->vtnet_media, VTNET_MEDIATYPE, 0, NULL); 301 ifmedia_set(&sc->vtnet_media, VTNET_MEDIATYPE); 302 303 vtnet_add_statistics(sc); 304 305 virtio_set_feature_desc(dev, vtnet_feature_desc); 306 vtnet_negotiate_features(sc); 307 308 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 309 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 310 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 311 } else 312 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 313 314 sc->vtnet_rx_mbuf_size = MCLBYTES; 315 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc); 316 317 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 318 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 319 320 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) { 321 sc->vtnet_mac_filter = malloc( 322 sizeof(struct vtnet_mac_filter), M_DEVBUF, 323 M_NOWAIT | M_ZERO); 324 if (sc->vtnet_mac_filter == NULL) { 325 device_printf(dev, 326 "cannot allocate mac filter table\n"); 327 error = ENOMEM; 328 goto fail; 329 } 330 331 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 332 } 333 334 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 335 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 336 } 337 338 vtnet_get_hwaddr(sc); 339 340 error = vtnet_alloc_virtqueues(sc); 341 if (error) { 342 device_printf(dev, "cannot allocate virtqueues\n"); 343 goto fail; 344 } 345 346 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER); 347 if (ifp == NULL) { 348 device_printf(dev, "cannot allocate ifnet structure\n"); 349 error = ENOSPC; 350 goto fail; 351 } 352 353 ifp->if_softc = sc; 354 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 355 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 356 ifp->if_init = vtnet_init; 357 ifp->if_start = vtnet_start; 358 ifp->if_ioctl = vtnet_ioctl; 359 360 sc->vtnet_rx_size = virtqueue_size(sc->vtnet_rx_vq); 361 sc->vtnet_rx_process_limit = sc->vtnet_rx_size; 362 363 tx_size = virtqueue_size(sc->vtnet_tx_vq); 364 sc->vtnet_tx_size = tx_size; 365 IFQ_SET_MAXLEN(&ifp->if_snd, tx_size - 1); 366 ifp->if_snd.ifq_drv_maxlen = tx_size - 1; 367 IFQ_SET_READY(&ifp->if_snd); 368 369 ether_ifattach(ifp, sc->vtnet_hwaddr); 370 371 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 372 ifp->if_capabilities |= IFCAP_LINKSTATE; 373 374 /* Tell the upper layer(s) we support long frames. */ 375 ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header); 376 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 377 378 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 379 ifp->if_capabilities |= IFCAP_TXCSUM; 380 381 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 382 ifp->if_capabilities |= IFCAP_TSO4; 383 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 384 ifp->if_capabilities |= IFCAP_TSO6; 385 if (ifp->if_capabilities & IFCAP_TSO) 386 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 387 388 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 389 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 390 } 391 392 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 393 ifp->if_capabilities |= IFCAP_RXCSUM; 394 395 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) || 396 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6)) 397 ifp->if_capabilities |= IFCAP_LRO; 398 } 399 400 if (ifp->if_capabilities & IFCAP_HWCSUM) { 401 /* 402 * VirtIO does not support VLAN tagging, but we can fake 403 * it by inserting and removing the 802.1Q header during 404 * transmit and receive. We are then able to do checksum 405 * offloading of VLAN frames. 406 */ 407 ifp->if_capabilities |= 408 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 409 } 410 411 ifp->if_capenable = ifp->if_capabilities; 412 413 /* 414 * Capabilities after here are not enabled by default. 415 */ 416 417 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 418 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 419 420 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 421 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 422 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 423 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 424 } 425 426 #ifdef DEVICE_POLLING 427 ifp->if_capabilities |= IFCAP_POLLING; 428 #endif 429 430 TASK_INIT(&sc->vtnet_rx_intr_task, 0, vtnet_rx_intr_task, sc); 431 TASK_INIT(&sc->vtnet_tx_intr_task, 0, vtnet_tx_intr_task, sc); 432 TASK_INIT(&sc->vtnet_cfgchg_task, 0, vtnet_config_change_task, sc); 433 434 sc->vtnet_tq = taskqueue_create_fast("vtnet_taskq", M_NOWAIT, 435 taskqueue_thread_enqueue, &sc->vtnet_tq); 436 if (sc->vtnet_tq == NULL) { 437 error = ENOMEM; 438 device_printf(dev, "cannot allocate taskqueue\n"); 439 ether_ifdetach(ifp); 440 goto fail; 441 } 442 taskqueue_start_threads(&sc->vtnet_tq, 1, PI_NET, "%s taskq", 443 device_get_nameunit(dev)); 444 445 error = virtio_setup_intr(dev, INTR_TYPE_NET); 446 if (error) { 447 device_printf(dev, "cannot setup virtqueue interrupts\n"); 448 taskqueue_free(sc->vtnet_tq); 449 sc->vtnet_tq = NULL; 450 ether_ifdetach(ifp); 451 goto fail; 452 } 453 454 /* 455 * Device defaults to promiscuous mode for backwards 456 * compatibility. Turn it off if possible. 457 */ 458 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 459 VTNET_LOCK(sc); 460 if (vtnet_set_promisc(sc, 0) != 0) { 461 ifp->if_flags |= IFF_PROMISC; 462 device_printf(dev, 463 "cannot disable promiscuous mode\n"); 464 } 465 VTNET_UNLOCK(sc); 466 } else 467 ifp->if_flags |= IFF_PROMISC; 468 469 fail: 470 if (error) 471 vtnet_detach(dev); 472 473 return (error); 474 } 475 476 static int 477 vtnet_detach(device_t dev) 478 { 479 struct vtnet_softc *sc; 480 struct ifnet *ifp; 481 482 sc = device_get_softc(dev); 483 ifp = sc->vtnet_ifp; 484 485 KASSERT(mtx_initialized(VTNET_MTX(sc)), 486 ("vtnet mutex not initialized")); 487 488 #ifdef DEVICE_POLLING 489 if (ifp != NULL && ifp->if_capenable & IFCAP_POLLING) 490 ether_poll_deregister(ifp); 491 #endif 492 493 if (device_is_attached(dev)) { 494 VTNET_LOCK(sc); 495 vtnet_stop(sc); 496 VTNET_UNLOCK(sc); 497 498 callout_drain(&sc->vtnet_tick_ch); 499 taskqueue_drain(taskqueue_fast, &sc->vtnet_cfgchg_task); 500 501 ether_ifdetach(ifp); 502 } 503 504 if (sc->vtnet_tq != NULL) { 505 taskqueue_drain(sc->vtnet_tq, &sc->vtnet_rx_intr_task); 506 taskqueue_drain(sc->vtnet_tq, &sc->vtnet_tx_intr_task); 507 taskqueue_free(sc->vtnet_tq); 508 sc->vtnet_tq = NULL; 509 } 510 511 if (sc->vtnet_vlan_attach != NULL) { 512 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 513 sc->vtnet_vlan_attach = NULL; 514 } 515 if (sc->vtnet_vlan_detach != NULL) { 516 EVENTHANDLER_DEREGISTER(vlan_unconfg, sc->vtnet_vlan_detach); 517 sc->vtnet_vlan_detach = NULL; 518 } 519 520 if (sc->vtnet_mac_filter != NULL) { 521 free(sc->vtnet_mac_filter, M_DEVBUF); 522 sc->vtnet_mac_filter = NULL; 523 } 524 525 if (ifp != NULL) { 526 if_free(ifp); 527 sc->vtnet_ifp = NULL; 528 } 529 530 if (sc->vtnet_rx_vq != NULL) 531 vtnet_free_rx_mbufs(sc); 532 if (sc->vtnet_tx_vq != NULL) 533 vtnet_free_tx_mbufs(sc); 534 if (sc->vtnet_ctrl_vq != NULL) 535 vtnet_free_ctrl_vq(sc); 536 537 ifmedia_removeall(&sc->vtnet_media); 538 VTNET_LOCK_DESTROY(sc); 539 540 return (0); 541 } 542 543 static int 544 vtnet_suspend(device_t dev) 545 { 546 struct vtnet_softc *sc; 547 548 sc = device_get_softc(dev); 549 550 VTNET_LOCK(sc); 551 vtnet_stop(sc); 552 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 553 VTNET_UNLOCK(sc); 554 555 return (0); 556 } 557 558 static int 559 vtnet_resume(device_t dev) 560 { 561 struct vtnet_softc *sc; 562 struct ifnet *ifp; 563 564 sc = device_get_softc(dev); 565 ifp = sc->vtnet_ifp; 566 567 VTNET_LOCK(sc); 568 if (ifp->if_flags & IFF_UP) 569 vtnet_init_locked(sc); 570 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 571 VTNET_UNLOCK(sc); 572 573 return (0); 574 } 575 576 static int 577 vtnet_shutdown(device_t dev) 578 { 579 580 /* 581 * Suspend already does all of what we need to 582 * do here; we just never expect to be resumed. 583 */ 584 return (vtnet_suspend(dev)); 585 } 586 587 static int 588 vtnet_config_change(device_t dev) 589 { 590 struct vtnet_softc *sc; 591 592 sc = device_get_softc(dev); 593 594 taskqueue_enqueue_fast(taskqueue_fast, &sc->vtnet_cfgchg_task); 595 596 return (1); 597 } 598 599 static void 600 vtnet_negotiate_features(struct vtnet_softc *sc) 601 { 602 device_t dev; 603 uint64_t mask, features; 604 605 dev = sc->vtnet_dev; 606 mask = 0; 607 608 if (vtnet_csum_disable) 609 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM; 610 611 /* 612 * TSO and LRO are only available when their corresponding 613 * checksum offload feature is also negotiated. 614 */ 615 616 if (vtnet_csum_disable || vtnet_tso_disable) 617 mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | 618 VIRTIO_NET_F_HOST_ECN; 619 620 if (vtnet_csum_disable || vtnet_lro_disable) 621 mask |= VTNET_LRO_FEATURES; 622 623 features = VTNET_FEATURES & ~mask; 624 #ifdef VTNET_TX_INTR_MODERATION 625 features |= VIRTIO_F_NOTIFY_ON_EMPTY; 626 #endif 627 sc->vtnet_features = virtio_negotiate_features(dev, features); 628 629 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0 && 630 virtio_with_feature(dev, VTNET_LRO_FEATURES)) { 631 /* 632 * LRO without mergeable buffers requires special care. This 633 * is not ideal because every receive buffer must be large 634 * enough to hold the maximum TCP packet, the Ethernet header, 635 * and the vtnet_rx_header. This requires up to 34 descriptors 636 * when using MCLBYTES clusters. If we do not have indirect 637 * descriptors, LRO is disabled since the virtqueue will not 638 * be able to contain very many receive buffers. 639 */ 640 if (virtio_with_feature(dev, 641 VIRTIO_RING_F_INDIRECT_DESC) == 0) { 642 device_printf(dev, 643 "LRO disabled due to lack of both mergeable " 644 "buffers and indirect descriptors\n"); 645 646 sc->vtnet_features = virtio_negotiate_features(dev, 647 features & ~VTNET_LRO_FEATURES); 648 } else 649 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 650 } 651 } 652 653 static int 654 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 655 { 656 device_t dev; 657 struct vq_alloc_info vq_info[3]; 658 int nvqs, rxsegs; 659 660 dev = sc->vtnet_dev; 661 nvqs = 2; 662 663 /* 664 * Indirect descriptors are not needed for the Rx 665 * virtqueue when mergeable buffers are negotiated. 666 * The header is placed inline with the data, not 667 * in a separate descriptor, and mbuf clusters are 668 * always physically contiguous. 669 */ 670 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 671 rxsegs = sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG ? 672 VTNET_MAX_RX_SEGS : VTNET_MIN_RX_SEGS; 673 } else 674 rxsegs = 0; 675 676 VQ_ALLOC_INFO_INIT(&vq_info[0], rxsegs, 677 vtnet_rx_vq_intr, sc, &sc->vtnet_rx_vq, 678 "%s receive", device_get_nameunit(dev)); 679 680 VQ_ALLOC_INFO_INIT(&vq_info[1], VTNET_MAX_TX_SEGS, 681 vtnet_tx_vq_intr, sc, &sc->vtnet_tx_vq, 682 "%s transmit", device_get_nameunit(dev)); 683 684 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 685 nvqs++; 686 687 VQ_ALLOC_INFO_INIT(&vq_info[2], 0, NULL, NULL, 688 &sc->vtnet_ctrl_vq, "%s control", 689 device_get_nameunit(dev)); 690 } 691 692 return (virtio_alloc_virtqueues(dev, 0, nvqs, vq_info)); 693 } 694 695 static void 696 vtnet_get_hwaddr(struct vtnet_softc *sc) 697 { 698 device_t dev; 699 700 dev = sc->vtnet_dev; 701 702 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 703 virtio_read_device_config(dev, 704 offsetof(struct virtio_net_config, mac), 705 sc->vtnet_hwaddr, ETHER_ADDR_LEN); 706 } else { 707 /* Generate random locally administered unicast address. */ 708 sc->vtnet_hwaddr[0] = 0xB2; 709 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 710 711 vtnet_set_hwaddr(sc); 712 } 713 } 714 715 static void 716 vtnet_set_hwaddr(struct vtnet_softc *sc) 717 { 718 device_t dev; 719 720 dev = sc->vtnet_dev; 721 722 virtio_write_device_config(dev, 723 offsetof(struct virtio_net_config, mac), 724 sc->vtnet_hwaddr, ETHER_ADDR_LEN); 725 } 726 727 static int 728 vtnet_is_link_up(struct vtnet_softc *sc) 729 { 730 device_t dev; 731 struct ifnet *ifp; 732 uint16_t status; 733 734 dev = sc->vtnet_dev; 735 ifp = sc->vtnet_ifp; 736 737 VTNET_LOCK_ASSERT(sc); 738 739 if ((ifp->if_capenable & IFCAP_LINKSTATE) == 0) 740 return (1); 741 742 status = virtio_read_dev_config_2(dev, 743 offsetof(struct virtio_net_config, status)); 744 745 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 746 } 747 748 static void 749 vtnet_update_link_status(struct vtnet_softc *sc) 750 { 751 device_t dev; 752 struct ifnet *ifp; 753 int link; 754 755 dev = sc->vtnet_dev; 756 ifp = sc->vtnet_ifp; 757 758 link = vtnet_is_link_up(sc); 759 760 if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) { 761 sc->vtnet_flags |= VTNET_FLAG_LINK; 762 if_link_state_change(ifp, LINK_STATE_UP); 763 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 764 vtnet_start_locked(ifp); 765 } else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) { 766 sc->vtnet_flags &= ~VTNET_FLAG_LINK; 767 if_link_state_change(ifp, LINK_STATE_DOWN); 768 } 769 } 770 771 static void 772 vtnet_watchdog(struct vtnet_softc *sc) 773 { 774 struct ifnet *ifp; 775 776 ifp = sc->vtnet_ifp; 777 778 #ifdef VTNET_TX_INTR_MODERATION 779 vtnet_txeof(sc); 780 #endif 781 782 if (sc->vtnet_watchdog_timer == 0 || --sc->vtnet_watchdog_timer) 783 return; 784 785 if_printf(ifp, "watchdog timeout -- resetting\n"); 786 #ifdef VTNET_DEBUG 787 virtqueue_dump(sc->vtnet_tx_vq); 788 #endif 789 ifp->if_oerrors++; 790 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 791 vtnet_init_locked(sc); 792 } 793 794 static void 795 vtnet_config_change_task(void *arg, int pending) 796 { 797 struct vtnet_softc *sc; 798 799 sc = arg; 800 801 VTNET_LOCK(sc); 802 vtnet_update_link_status(sc); 803 VTNET_UNLOCK(sc); 804 } 805 806 static int 807 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 808 { 809 struct vtnet_softc *sc; 810 struct ifreq *ifr; 811 int reinit, mask, error; 812 813 sc = ifp->if_softc; 814 ifr = (struct ifreq *) data; 815 reinit = 0; 816 error = 0; 817 818 switch (cmd) { 819 case SIOCSIFMTU: 820 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > VTNET_MAX_MTU) 821 error = EINVAL; 822 else if (ifp->if_mtu != ifr->ifr_mtu) { 823 VTNET_LOCK(sc); 824 error = vtnet_change_mtu(sc, ifr->ifr_mtu); 825 VTNET_UNLOCK(sc); 826 } 827 break; 828 829 case SIOCSIFFLAGS: 830 VTNET_LOCK(sc); 831 if ((ifp->if_flags & IFF_UP) == 0) { 832 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 833 vtnet_stop(sc); 834 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 835 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 836 (IFF_PROMISC | IFF_ALLMULTI)) { 837 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 838 vtnet_rx_filter(sc); 839 else 840 error = ENOTSUP; 841 } 842 } else 843 vtnet_init_locked(sc); 844 845 if (error == 0) 846 sc->vtnet_if_flags = ifp->if_flags; 847 VTNET_UNLOCK(sc); 848 break; 849 850 case SIOCADDMULTI: 851 case SIOCDELMULTI: 852 VTNET_LOCK(sc); 853 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) && 854 (ifp->if_drv_flags & IFF_DRV_RUNNING)) 855 vtnet_rx_filter_mac(sc); 856 VTNET_UNLOCK(sc); 857 break; 858 859 case SIOCSIFMEDIA: 860 case SIOCGIFMEDIA: 861 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 862 break; 863 864 case SIOCSIFCAP: 865 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 866 867 #ifdef DEVICE_POLLING 868 if (mask & IFCAP_POLLING) { 869 if (ifr->ifr_reqcap & IFCAP_POLLING) { 870 error = ether_poll_register(vtnet_poll, ifp); 871 if (error) 872 break; 873 874 VTNET_LOCK(sc); 875 vtnet_disable_rx_intr(sc); 876 vtnet_disable_tx_intr(sc); 877 ifp->if_capenable |= IFCAP_POLLING; 878 VTNET_UNLOCK(sc); 879 } else { 880 error = ether_poll_deregister(ifp); 881 882 /* Enable interrupts even in error case. */ 883 VTNET_LOCK(sc); 884 vtnet_enable_tx_intr(sc); 885 vtnet_enable_rx_intr(sc); 886 ifp->if_capenable &= ~IFCAP_POLLING; 887 VTNET_UNLOCK(sc); 888 } 889 } 890 #endif 891 VTNET_LOCK(sc); 892 893 if (mask & IFCAP_TXCSUM) { 894 ifp->if_capenable ^= IFCAP_TXCSUM; 895 if (ifp->if_capenable & IFCAP_TXCSUM) 896 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 897 else 898 ifp->if_hwassist &= ~VTNET_CSUM_OFFLOAD; 899 } 900 901 if (mask & IFCAP_TSO4) { 902 ifp->if_capenable ^= IFCAP_TSO4; 903 if (ifp->if_capenable & IFCAP_TSO4) 904 ifp->if_hwassist |= CSUM_TSO; 905 else 906 ifp->if_hwassist &= ~CSUM_TSO; 907 } 908 909 if (mask & IFCAP_RXCSUM) { 910 ifp->if_capenable ^= IFCAP_RXCSUM; 911 reinit = 1; 912 } 913 914 if (mask & IFCAP_LRO) { 915 ifp->if_capenable ^= IFCAP_LRO; 916 reinit = 1; 917 } 918 919 if (mask & IFCAP_VLAN_HWFILTER) { 920 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 921 reinit = 1; 922 } 923 924 if (mask & IFCAP_VLAN_HWTSO) 925 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 926 927 if (mask & IFCAP_VLAN_HWTAGGING) 928 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 929 930 if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 931 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 932 vtnet_init_locked(sc); 933 } 934 VLAN_CAPABILITIES(ifp); 935 936 VTNET_UNLOCK(sc); 937 break; 938 939 default: 940 error = ether_ioctl(ifp, cmd, data); 941 break; 942 } 943 944 VTNET_LOCK_ASSERT_NOTOWNED(sc); 945 946 return (error); 947 } 948 949 static int 950 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu) 951 { 952 struct ifnet *ifp; 953 int new_frame_size, clsize; 954 955 ifp = sc->vtnet_ifp; 956 957 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 958 new_frame_size = sizeof(struct vtnet_rx_header) + 959 sizeof(struct ether_vlan_header) + new_mtu; 960 961 if (new_frame_size > MJUM9BYTES) 962 return (EINVAL); 963 964 if (new_frame_size <= MCLBYTES) 965 clsize = MCLBYTES; 966 else 967 clsize = MJUM9BYTES; 968 } else { 969 new_frame_size = sizeof(struct virtio_net_hdr_mrg_rxbuf) + 970 sizeof(struct ether_vlan_header) + new_mtu; 971 972 if (new_frame_size <= MCLBYTES) 973 clsize = MCLBYTES; 974 else 975 clsize = MJUMPAGESIZE; 976 } 977 978 sc->vtnet_rx_mbuf_size = clsize; 979 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc); 980 KASSERT(sc->vtnet_rx_mbuf_count < VTNET_MAX_RX_SEGS, 981 ("too many rx mbufs: %d", sc->vtnet_rx_mbuf_count)); 982 983 ifp->if_mtu = new_mtu; 984 985 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 986 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 987 vtnet_init_locked(sc); 988 } 989 990 return (0); 991 } 992 993 static int 994 vtnet_init_rx_vq(struct vtnet_softc *sc) 995 { 996 struct virtqueue *vq; 997 int nbufs, error; 998 999 vq = sc->vtnet_rx_vq; 1000 nbufs = 0; 1001 error = ENOSPC; 1002 1003 while (!virtqueue_full(vq)) { 1004 if ((error = vtnet_newbuf(sc)) != 0) 1005 break; 1006 nbufs++; 1007 } 1008 1009 if (nbufs > 0) { 1010 virtqueue_notify(vq); 1011 1012 /* 1013 * EMSGSIZE signifies the virtqueue did not have enough 1014 * entries available to hold the last mbuf. This is not 1015 * an error. We should not get ENOSPC since we check if 1016 * the virtqueue is full before attempting to add a 1017 * buffer. 1018 */ 1019 if (error == EMSGSIZE) 1020 error = 0; 1021 } 1022 1023 return (error); 1024 } 1025 1026 static void 1027 vtnet_free_rx_mbufs(struct vtnet_softc *sc) 1028 { 1029 struct virtqueue *vq; 1030 struct mbuf *m; 1031 int last; 1032 1033 vq = sc->vtnet_rx_vq; 1034 last = 0; 1035 1036 while ((m = virtqueue_drain(vq, &last)) != NULL) 1037 m_freem(m); 1038 1039 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Rx Vq")); 1040 } 1041 1042 static void 1043 vtnet_free_tx_mbufs(struct vtnet_softc *sc) 1044 { 1045 struct virtqueue *vq; 1046 struct vtnet_tx_header *txhdr; 1047 int last; 1048 1049 vq = sc->vtnet_tx_vq; 1050 last = 0; 1051 1052 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 1053 m_freem(txhdr->vth_mbuf); 1054 uma_zfree(vtnet_tx_header_zone, txhdr); 1055 } 1056 1057 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Tx Vq")); 1058 } 1059 1060 static void 1061 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 1062 { 1063 1064 /* 1065 * The control virtqueue is only polled, therefore 1066 * it should already be empty. 1067 */ 1068 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 1069 ("Ctrl Vq not empty")); 1070 } 1071 1072 #ifdef DEVICE_POLLING 1073 static int 1074 vtnet_poll(struct ifnet *ifp, enum poll_cmd cmd, int count) 1075 { 1076 struct vtnet_softc *sc; 1077 int rx_done; 1078 1079 sc = ifp->if_softc; 1080 rx_done = 0; 1081 1082 VTNET_LOCK(sc); 1083 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1084 if (cmd == POLL_AND_CHECK_STATUS) 1085 vtnet_update_link_status(sc); 1086 1087 if (virtqueue_nused(sc->vtnet_rx_vq) > 0) 1088 vtnet_rxeof(sc, count, &rx_done); 1089 1090 vtnet_txeof(sc); 1091 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 1092 vtnet_start_locked(ifp); 1093 } 1094 VTNET_UNLOCK(sc); 1095 1096 return (rx_done); 1097 } 1098 #endif /* DEVICE_POLLING */ 1099 1100 static struct mbuf * 1101 vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1102 { 1103 struct mbuf *m_head, *m_tail, *m; 1104 int i, clsize; 1105 1106 clsize = sc->vtnet_rx_mbuf_size; 1107 1108 m_head = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, clsize); 1109 if (m_head == NULL) 1110 goto fail; 1111 1112 m_head->m_len = clsize; 1113 m_tail = m_head; 1114 1115 if (nbufs > 1) { 1116 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1117 ("chained Rx mbuf requested without LRO_NOMRG")); 1118 1119 for (i = 1; i < nbufs; i++) { 1120 m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize); 1121 if (m == NULL) 1122 goto fail; 1123 1124 m->m_len = clsize; 1125 m_tail->m_next = m; 1126 m_tail = m; 1127 } 1128 } 1129 1130 if (m_tailp != NULL) 1131 *m_tailp = m_tail; 1132 1133 return (m_head); 1134 1135 fail: 1136 sc->vtnet_stats.mbuf_alloc_failed++; 1137 m_freem(m_head); 1138 1139 return (NULL); 1140 } 1141 1142 static int 1143 vtnet_replace_rxbuf(struct vtnet_softc *sc, struct mbuf *m0, int len0) 1144 { 1145 struct mbuf *m, *m_prev; 1146 struct mbuf *m_new, *m_tail; 1147 int len, clsize, nreplace, error; 1148 1149 m = m0; 1150 m_prev = NULL; 1151 len = len0; 1152 1153 m_tail = NULL; 1154 clsize = sc->vtnet_rx_mbuf_size; 1155 nreplace = 0; 1156 1157 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || 1158 m->m_next == NULL, ("chained Rx mbuf without LRO_NOMRG")); 1159 1160 /* 1161 * Since LRO_NOMRG mbuf chains are so large, we want to avoid 1162 * allocating an entire chain for each received frame. When 1163 * the received frame's length is less than that of the chain, 1164 * the unused mbufs are reassigned to the new chain. 1165 */ 1166 while (len > 0) { 1167 /* 1168 * Something is seriously wrong if we received 1169 * a frame larger than the mbuf chain. Drop it. 1170 */ 1171 if (m == NULL) { 1172 sc->vtnet_stats.rx_frame_too_large++; 1173 return (EMSGSIZE); 1174 } 1175 1176 KASSERT(m->m_len == clsize, 1177 ("mbuf length not expected cluster size: %d", 1178 m->m_len)); 1179 1180 m->m_len = MIN(m->m_len, len); 1181 len -= m->m_len; 1182 1183 m_prev = m; 1184 m = m->m_next; 1185 nreplace++; 1186 } 1187 1188 KASSERT(m_prev != NULL, ("m_prev == NULL")); 1189 KASSERT(nreplace <= sc->vtnet_rx_mbuf_count, 1190 ("too many replacement mbufs: %d/%d", nreplace, 1191 sc->vtnet_rx_mbuf_count)); 1192 1193 m_new = vtnet_alloc_rxbuf(sc, nreplace, &m_tail); 1194 if (m_new == NULL) { 1195 m_prev->m_len = clsize; 1196 return (ENOBUFS); 1197 } 1198 1199 /* 1200 * Move unused mbufs, if any, from the original chain 1201 * onto the end of the new chain. 1202 */ 1203 if (m_prev->m_next != NULL) { 1204 m_tail->m_next = m_prev->m_next; 1205 m_prev->m_next = NULL; 1206 } 1207 1208 error = vtnet_enqueue_rxbuf(sc, m_new); 1209 if (error) { 1210 /* 1211 * BAD! We could not enqueue the replacement mbuf chain. We 1212 * must restore the m0 chain to the original state if it was 1213 * modified so we can subsequently discard it. 1214 * 1215 * NOTE: The replacement is suppose to be an identical copy 1216 * to the one just dequeued so this is an unexpected error. 1217 */ 1218 sc->vtnet_stats.rx_enq_replacement_failed++; 1219 1220 if (m_tail->m_next != NULL) { 1221 m_prev->m_next = m_tail->m_next; 1222 m_tail->m_next = NULL; 1223 } 1224 1225 m_prev->m_len = clsize; 1226 m_freem(m_new); 1227 } 1228 1229 return (error); 1230 } 1231 1232 static int 1233 vtnet_newbuf(struct vtnet_softc *sc) 1234 { 1235 struct mbuf *m; 1236 int error; 1237 1238 m = vtnet_alloc_rxbuf(sc, sc->vtnet_rx_mbuf_count, NULL); 1239 if (m == NULL) 1240 return (ENOBUFS); 1241 1242 error = vtnet_enqueue_rxbuf(sc, m); 1243 if (error) 1244 m_freem(m); 1245 1246 return (error); 1247 } 1248 1249 static void 1250 vtnet_discard_merged_rxbuf(struct vtnet_softc *sc, int nbufs) 1251 { 1252 struct virtqueue *vq; 1253 struct mbuf *m; 1254 1255 vq = sc->vtnet_rx_vq; 1256 1257 while (--nbufs > 0) { 1258 if ((m = virtqueue_dequeue(vq, NULL)) == NULL) 1259 break; 1260 vtnet_discard_rxbuf(sc, m); 1261 } 1262 } 1263 1264 static void 1265 vtnet_discard_rxbuf(struct vtnet_softc *sc, struct mbuf *m) 1266 { 1267 int error; 1268 1269 /* 1270 * Requeue the discarded mbuf. This should always be 1271 * successful since it was just dequeued. 1272 */ 1273 error = vtnet_enqueue_rxbuf(sc, m); 1274 KASSERT(error == 0, ("cannot requeue discarded mbuf")); 1275 } 1276 1277 static int 1278 vtnet_enqueue_rxbuf(struct vtnet_softc *sc, struct mbuf *m) 1279 { 1280 struct sglist sg; 1281 struct sglist_seg segs[VTNET_MAX_RX_SEGS]; 1282 struct vtnet_rx_header *rxhdr; 1283 struct virtio_net_hdr *hdr; 1284 uint8_t *mdata; 1285 int offset, error; 1286 1287 VTNET_LOCK_ASSERT(sc); 1288 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || 1289 m->m_next == NULL, ("chained Rx mbuf without LRO_NOMRG")); 1290 1291 sglist_init(&sg, VTNET_MAX_RX_SEGS, segs); 1292 1293 mdata = mtod(m, uint8_t *); 1294 offset = 0; 1295 1296 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1297 rxhdr = (struct vtnet_rx_header *) mdata; 1298 hdr = &rxhdr->vrh_hdr; 1299 offset += sizeof(struct vtnet_rx_header); 1300 1301 error = sglist_append(&sg, hdr, sc->vtnet_hdr_size); 1302 KASSERT(error == 0, ("cannot add header to sglist")); 1303 } 1304 1305 error = sglist_append(&sg, mdata + offset, m->m_len - offset); 1306 if (error) 1307 return (error); 1308 1309 if (m->m_next != NULL) { 1310 error = sglist_append_mbuf(&sg, m->m_next); 1311 if (error) 1312 return (error); 1313 } 1314 1315 return (virtqueue_enqueue(sc->vtnet_rx_vq, m, &sg, 0, sg.sg_nseg)); 1316 } 1317 1318 static void 1319 vtnet_vlan_tag_remove(struct mbuf *m) 1320 { 1321 struct ether_vlan_header *evl; 1322 1323 evl = mtod(m, struct ether_vlan_header *); 1324 1325 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag); 1326 m->m_flags |= M_VLANTAG; 1327 1328 /* Strip the 802.1Q header. */ 1329 bcopy((char *) evl, (char *) evl + ETHER_VLAN_ENCAP_LEN, 1330 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1331 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1332 } 1333 1334 #ifdef notyet 1335 static int 1336 vtnet_rx_csum(struct vtnet_softc *sc, struct mbuf *m, 1337 struct virtio_net_hdr *hdr) 1338 { 1339 struct ether_header *eh; 1340 struct ether_vlan_header *evh; 1341 struct ip *ip; 1342 struct ip6_hdr *ip6; 1343 struct udphdr *udp; 1344 int ip_offset, csum_start, csum_offset, hlen; 1345 uint16_t eth_type; 1346 uint8_t ip_proto; 1347 1348 /* 1349 * Convert the VirtIO checksum interface to FreeBSD's interface. 1350 * The host only provides us with the offset at which to start 1351 * checksumming, and the offset from that to place the completed 1352 * checksum. While this maps well with how Linux does checksums, 1353 * for FreeBSD, we must parse the received packet in order to set 1354 * the appropriate CSUM_* flags. 1355 */ 1356 1357 /* 1358 * Every mbuf added to the receive virtqueue is always at least 1359 * MCLBYTES big, so assume something is amiss if the first mbuf 1360 * does not contain both the Ethernet and protocol headers. 1361 */ 1362 ip_offset = sizeof(struct ether_header); 1363 if (m->m_len < ip_offset) 1364 return (1); 1365 1366 eh = mtod(m, struct ether_header *); 1367 eth_type = ntohs(eh->ether_type); 1368 if (eth_type == ETHERTYPE_VLAN) { 1369 ip_offset = sizeof(struct ether_vlan_header); 1370 if (m->m_len < ip_offset) 1371 return (1); 1372 evh = mtod(m, struct ether_vlan_header *); 1373 eth_type = ntohs(evh->evl_proto); 1374 } 1375 1376 switch (eth_type) { 1377 case ETHERTYPE_IP: 1378 if (m->m_len < ip_offset + sizeof(struct ip)) 1379 return (1); 1380 1381 ip = (struct ip *)(mtod(m, uint8_t *) + ip_offset); 1382 /* Sanity check the IP header. */ 1383 if (ip->ip_v != IPVERSION) 1384 return (1); 1385 hlen = ip->ip_hl << 2; 1386 if (hlen < sizeof(struct ip)) 1387 return (1); 1388 if (ntohs(ip->ip_len) < hlen) 1389 return (1); 1390 if (ntohs(ip->ip_len) != (m->m_pkthdr.len - ip_offset)) 1391 return (1); 1392 1393 ip_proto = ip->ip_p; 1394 csum_start = ip_offset + hlen; 1395 break; 1396 1397 case ETHERTYPE_IPV6: 1398 if (m->m_len < ip_offset + sizeof(struct ip6_hdr)) 1399 return (1); 1400 1401 /* 1402 * XXX FreeBSD does not handle any IPv6 checksum offloading 1403 * at the moment. 1404 */ 1405 1406 ip6 = (struct ip6_hdr *)(mtod(m, uint8_t *) + ip_offset); 1407 /* XXX Assume no extension headers are present. */ 1408 ip_proto = ip6->ip6_nxt; 1409 csum_start = ip_offset + sizeof(struct ip6_hdr); 1410 break; 1411 1412 default: 1413 sc->vtnet_stats.rx_csum_bad_ethtype++; 1414 return (1); 1415 } 1416 1417 /* Assume checksum begins right after the IP header. */ 1418 if (hdr->csum_start != csum_start) { 1419 sc->vtnet_stats.rx_csum_bad_start++; 1420 return (1); 1421 } 1422 1423 switch (ip_proto) { 1424 case IPPROTO_TCP: 1425 csum_offset = offsetof(struct tcphdr, th_sum); 1426 break; 1427 1428 case IPPROTO_UDP: 1429 csum_offset = offsetof(struct udphdr, uh_sum); 1430 break; 1431 1432 case IPPROTO_SCTP: 1433 csum_offset = offsetof(struct sctphdr, checksum); 1434 break; 1435 1436 default: 1437 sc->vtnet_stats.rx_csum_bad_ipproto++; 1438 return (1); 1439 } 1440 1441 if (hdr->csum_offset != csum_offset) { 1442 sc->vtnet_stats.rx_csum_bad_offset++; 1443 return (1); 1444 } 1445 1446 /* 1447 * The IP header checksum is almost certainly valid but I'm 1448 * uncertain if that is guaranteed. 1449 * 1450 * m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED | CSUM_IP_VALID; 1451 */ 1452 1453 switch (ip_proto) { 1454 case IPPROTO_UDP: 1455 if (m->m_len < csum_start + sizeof(struct udphdr)) 1456 return (1); 1457 1458 udp = (struct udphdr *)(mtod(m, uint8_t *) + csum_start); 1459 if (udp->uh_sum == 0) 1460 return (0); 1461 1462 /* FALLTHROUGH */ 1463 1464 case IPPROTO_TCP: 1465 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1466 m->m_pkthdr.csum_data = 0xFFFF; 1467 break; 1468 1469 case IPPROTO_SCTP: 1470 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1471 break; 1472 } 1473 1474 sc->vtnet_stats.rx_csum_offloaded++; 1475 1476 return (0); 1477 } 1478 #endif 1479 1480 /* 1481 * Alternative method of doing receive checksum offloading. Rather 1482 * than parsing the received frame down to the IP header, use the 1483 * csum_offset to determine which CSUM_* flags are appropriate. We 1484 * can get by with doing this only because the checksum offsets are 1485 * unique for the things we care about. 1486 */ 1487 static int 1488 vtnet_rx_csum(struct vtnet_softc *sc, struct mbuf *m, 1489 struct virtio_net_hdr *hdr) 1490 { 1491 struct ether_header *eh; 1492 struct ether_vlan_header *evh; 1493 struct udphdr *udp; 1494 int csum_len; 1495 uint16_t eth_type; 1496 1497 csum_len = hdr->csum_start + hdr->csum_offset; 1498 1499 if (csum_len < sizeof(struct ether_header) + sizeof(struct ip)) 1500 return (1); 1501 if (m->m_len < csum_len) 1502 return (1); 1503 1504 eh = mtod(m, struct ether_header *); 1505 eth_type = ntohs(eh->ether_type); 1506 if (eth_type == ETHERTYPE_VLAN) { 1507 evh = mtod(m, struct ether_vlan_header *); 1508 eth_type = ntohs(evh->evl_proto); 1509 } 1510 1511 if (eth_type != ETHERTYPE_IP && eth_type != ETHERTYPE_IPV6) { 1512 sc->vtnet_stats.rx_csum_bad_ethtype++; 1513 return (1); 1514 } 1515 1516 /* Use the offset to determine the appropriate CSUM_* flags. */ 1517 switch (hdr->csum_offset) { 1518 case offsetof(struct udphdr, uh_sum): 1519 if (m->m_len < hdr->csum_start + sizeof(struct udphdr)) 1520 return (1); 1521 udp = (struct udphdr *)(mtod(m, uint8_t *) + hdr->csum_start); 1522 if (udp->uh_sum == 0) 1523 return (0); 1524 1525 /* FALLTHROUGH */ 1526 1527 case offsetof(struct tcphdr, th_sum): 1528 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1529 m->m_pkthdr.csum_data = 0xFFFF; 1530 break; 1531 1532 case offsetof(struct sctphdr, checksum): 1533 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1534 break; 1535 1536 default: 1537 sc->vtnet_stats.rx_csum_bad_offset++; 1538 return (1); 1539 } 1540 1541 sc->vtnet_stats.rx_csum_offloaded++; 1542 1543 return (0); 1544 } 1545 1546 static int 1547 vtnet_rxeof_merged(struct vtnet_softc *sc, struct mbuf *m_head, int nbufs) 1548 { 1549 struct ifnet *ifp; 1550 struct virtqueue *vq; 1551 struct mbuf *m, *m_tail; 1552 int len; 1553 1554 ifp = sc->vtnet_ifp; 1555 vq = sc->vtnet_rx_vq; 1556 m_tail = m_head; 1557 1558 while (--nbufs > 0) { 1559 m = virtqueue_dequeue(vq, &len); 1560 if (m == NULL) { 1561 ifp->if_ierrors++; 1562 goto fail; 1563 } 1564 1565 if (vtnet_newbuf(sc) != 0) { 1566 ifp->if_iqdrops++; 1567 vtnet_discard_rxbuf(sc, m); 1568 if (nbufs > 1) 1569 vtnet_discard_merged_rxbuf(sc, nbufs); 1570 goto fail; 1571 } 1572 1573 if (m->m_len < len) 1574 len = m->m_len; 1575 1576 m->m_len = len; 1577 m->m_flags &= ~M_PKTHDR; 1578 1579 m_head->m_pkthdr.len += len; 1580 m_tail->m_next = m; 1581 m_tail = m; 1582 } 1583 1584 return (0); 1585 1586 fail: 1587 sc->vtnet_stats.rx_mergeable_failed++; 1588 m_freem(m_head); 1589 1590 return (1); 1591 } 1592 1593 static int 1594 vtnet_rxeof(struct vtnet_softc *sc, int count, int *rx_npktsp) 1595 { 1596 struct virtio_net_hdr lhdr; 1597 struct ifnet *ifp; 1598 struct virtqueue *vq; 1599 struct mbuf *m; 1600 struct ether_header *eh; 1601 struct virtio_net_hdr *hdr; 1602 struct virtio_net_hdr_mrg_rxbuf *mhdr; 1603 int len, deq, nbufs, adjsz, rx_npkts; 1604 1605 ifp = sc->vtnet_ifp; 1606 vq = sc->vtnet_rx_vq; 1607 hdr = &lhdr; 1608 deq = 0; 1609 rx_npkts = 0; 1610 1611 VTNET_LOCK_ASSERT(sc); 1612 1613 while (--count >= 0) { 1614 m = virtqueue_dequeue(vq, &len); 1615 if (m == NULL) 1616 break; 1617 deq++; 1618 1619 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 1620 ifp->if_ierrors++; 1621 vtnet_discard_rxbuf(sc, m); 1622 continue; 1623 } 1624 1625 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1626 nbufs = 1; 1627 adjsz = sizeof(struct vtnet_rx_header); 1628 /* 1629 * Account for our pad between the header and 1630 * the actual start of the frame. 1631 */ 1632 len += VTNET_RX_HEADER_PAD; 1633 } else { 1634 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 1635 nbufs = mhdr->num_buffers; 1636 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1637 } 1638 1639 if (vtnet_replace_rxbuf(sc, m, len) != 0) { 1640 ifp->if_iqdrops++; 1641 vtnet_discard_rxbuf(sc, m); 1642 if (nbufs > 1) 1643 vtnet_discard_merged_rxbuf(sc, nbufs); 1644 continue; 1645 } 1646 1647 m->m_pkthdr.len = len; 1648 m->m_pkthdr.rcvif = ifp; 1649 m->m_pkthdr.csum_flags = 0; 1650 1651 if (nbufs > 1) { 1652 if (vtnet_rxeof_merged(sc, m, nbufs) != 0) 1653 continue; 1654 } 1655 1656 ifp->if_ipackets++; 1657 1658 /* 1659 * Save copy of header before we strip it. For both mergeable 1660 * and non-mergeable, the VirtIO header is placed first in the 1661 * mbuf's data. We no longer need num_buffers, so always use a 1662 * virtio_net_hdr. 1663 */ 1664 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr)); 1665 m_adj(m, adjsz); 1666 1667 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1668 eh = mtod(m, struct ether_header *); 1669 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1670 vtnet_vlan_tag_remove(m); 1671 1672 /* 1673 * With the 802.1Q header removed, update the 1674 * checksum starting location accordingly. 1675 */ 1676 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1677 hdr->csum_start -= 1678 ETHER_VLAN_ENCAP_LEN; 1679 } 1680 } 1681 1682 if (ifp->if_capenable & IFCAP_RXCSUM && 1683 hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 1684 if (vtnet_rx_csum(sc, m, hdr) != 0) 1685 sc->vtnet_stats.rx_csum_failed++; 1686 } 1687 1688 VTNET_UNLOCK(sc); 1689 rx_npkts++; 1690 (*ifp->if_input)(ifp, m); 1691 VTNET_LOCK(sc); 1692 1693 /* 1694 * The interface may have been stopped while we were 1695 * passing the packet up the network stack. 1696 */ 1697 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1698 break; 1699 } 1700 1701 if (deq > 0) 1702 virtqueue_notify(vq); 1703 1704 if (rx_npktsp != NULL) 1705 *rx_npktsp = rx_npkts; 1706 1707 return (count > 0 ? 0 : EAGAIN); 1708 } 1709 1710 static void 1711 vtnet_rx_intr_task(void *arg, int pending) 1712 { 1713 struct vtnet_softc *sc; 1714 struct ifnet *ifp; 1715 int more; 1716 1717 sc = arg; 1718 ifp = sc->vtnet_ifp; 1719 1720 VTNET_LOCK(sc); 1721 1722 #ifdef DEVICE_POLLING 1723 if (ifp->if_capenable & IFCAP_POLLING) { 1724 VTNET_UNLOCK(sc); 1725 return; 1726 } 1727 #endif 1728 1729 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1730 vtnet_enable_rx_intr(sc); 1731 VTNET_UNLOCK(sc); 1732 return; 1733 } 1734 1735 more = vtnet_rxeof(sc, sc->vtnet_rx_process_limit, NULL); 1736 if (!more && vtnet_enable_rx_intr(sc) != 0) { 1737 vtnet_disable_rx_intr(sc); 1738 more = 1; 1739 } 1740 1741 VTNET_UNLOCK(sc); 1742 1743 if (more) { 1744 sc->vtnet_stats.rx_task_rescheduled++; 1745 taskqueue_enqueue_fast(sc->vtnet_tq, 1746 &sc->vtnet_rx_intr_task); 1747 } 1748 } 1749 1750 static int 1751 vtnet_rx_vq_intr(void *xsc) 1752 { 1753 struct vtnet_softc *sc; 1754 1755 sc = xsc; 1756 1757 vtnet_disable_rx_intr(sc); 1758 taskqueue_enqueue_fast(sc->vtnet_tq, &sc->vtnet_rx_intr_task); 1759 1760 return (1); 1761 } 1762 1763 static void 1764 vtnet_txeof(struct vtnet_softc *sc) 1765 { 1766 struct virtqueue *vq; 1767 struct ifnet *ifp; 1768 struct vtnet_tx_header *txhdr; 1769 int deq; 1770 1771 vq = sc->vtnet_tx_vq; 1772 ifp = sc->vtnet_ifp; 1773 deq = 0; 1774 1775 VTNET_LOCK_ASSERT(sc); 1776 1777 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 1778 deq++; 1779 ifp->if_opackets++; 1780 m_freem(txhdr->vth_mbuf); 1781 uma_zfree(vtnet_tx_header_zone, txhdr); 1782 } 1783 1784 if (deq > 0) { 1785 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1786 if (virtqueue_empty(vq)) 1787 sc->vtnet_watchdog_timer = 0; 1788 } 1789 } 1790 1791 static struct mbuf * 1792 vtnet_tx_offload(struct vtnet_softc *sc, struct mbuf *m, 1793 struct virtio_net_hdr *hdr) 1794 { 1795 struct ifnet *ifp; 1796 struct ether_header *eh; 1797 struct ether_vlan_header *evh; 1798 struct ip *ip; 1799 struct ip6_hdr *ip6; 1800 struct tcphdr *tcp; 1801 int ip_offset; 1802 uint16_t eth_type, csum_start; 1803 uint8_t ip_proto, gso_type; 1804 1805 ifp = sc->vtnet_ifp; 1806 M_ASSERTPKTHDR(m); 1807 1808 ip_offset = sizeof(struct ether_header); 1809 if (m->m_len < ip_offset) { 1810 if ((m = m_pullup(m, ip_offset)) == NULL) 1811 return (NULL); 1812 } 1813 1814 eh = mtod(m, struct ether_header *); 1815 eth_type = ntohs(eh->ether_type); 1816 if (eth_type == ETHERTYPE_VLAN) { 1817 ip_offset = sizeof(struct ether_vlan_header); 1818 if (m->m_len < ip_offset) { 1819 if ((m = m_pullup(m, ip_offset)) == NULL) 1820 return (NULL); 1821 } 1822 evh = mtod(m, struct ether_vlan_header *); 1823 eth_type = ntohs(evh->evl_proto); 1824 } 1825 1826 switch (eth_type) { 1827 case ETHERTYPE_IP: 1828 if (m->m_len < ip_offset + sizeof(struct ip)) { 1829 m = m_pullup(m, ip_offset + sizeof(struct ip)); 1830 if (m == NULL) 1831 return (NULL); 1832 } 1833 1834 ip = (struct ip *)(mtod(m, uint8_t *) + ip_offset); 1835 ip_proto = ip->ip_p; 1836 csum_start = ip_offset + (ip->ip_hl << 2); 1837 gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 1838 break; 1839 1840 case ETHERTYPE_IPV6: 1841 if (m->m_len < ip_offset + sizeof(struct ip6_hdr)) { 1842 m = m_pullup(m, ip_offset + sizeof(struct ip6_hdr)); 1843 if (m == NULL) 1844 return (NULL); 1845 } 1846 1847 ip6 = (struct ip6_hdr *)(mtod(m, uint8_t *) + ip_offset); 1848 /* 1849 * XXX Assume no extension headers are present. Presently, 1850 * this will always be true in the case of TSO, and FreeBSD 1851 * does not perform checksum offloading of IPv6 yet. 1852 */ 1853 ip_proto = ip6->ip6_nxt; 1854 csum_start = ip_offset + sizeof(struct ip6_hdr); 1855 gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 1856 break; 1857 1858 default: 1859 return (m); 1860 } 1861 1862 if (m->m_pkthdr.csum_flags & VTNET_CSUM_OFFLOAD) { 1863 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 1864 hdr->csum_start = csum_start; 1865 hdr->csum_offset = m->m_pkthdr.csum_data; 1866 1867 sc->vtnet_stats.tx_csum_offloaded++; 1868 } 1869 1870 if (m->m_pkthdr.csum_flags & CSUM_TSO) { 1871 if (ip_proto != IPPROTO_TCP) 1872 return (m); 1873 1874 if (m->m_len < csum_start + sizeof(struct tcphdr)) { 1875 m = m_pullup(m, csum_start + sizeof(struct tcphdr)); 1876 if (m == NULL) 1877 return (NULL); 1878 } 1879 1880 tcp = (struct tcphdr *)(mtod(m, uint8_t *) + csum_start); 1881 hdr->gso_type = gso_type; 1882 hdr->hdr_len = csum_start + (tcp->th_off << 2); 1883 hdr->gso_size = m->m_pkthdr.tso_segsz; 1884 1885 if (tcp->th_flags & TH_CWR) { 1886 /* 1887 * Drop if we did not negotiate VIRTIO_NET_F_HOST_ECN. 1888 * ECN support is only configurable globally with the 1889 * net.inet.tcp.ecn.enable sysctl knob. 1890 */ 1891 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 1892 if_printf(ifp, "TSO with ECN not supported " 1893 "by host\n"); 1894 m_freem(m); 1895 return (NULL); 1896 } 1897 1898 hdr->flags |= VIRTIO_NET_HDR_GSO_ECN; 1899 } 1900 1901 sc->vtnet_stats.tx_tso_offloaded++; 1902 } 1903 1904 return (m); 1905 } 1906 1907 static int 1908 vtnet_enqueue_txbuf(struct vtnet_softc *sc, struct mbuf **m_head, 1909 struct vtnet_tx_header *txhdr) 1910 { 1911 struct sglist sg; 1912 struct sglist_seg segs[VTNET_MAX_TX_SEGS]; 1913 struct virtqueue *vq; 1914 struct mbuf *m; 1915 int collapsed, error; 1916 1917 vq = sc->vtnet_tx_vq; 1918 m = *m_head; 1919 collapsed = 0; 1920 1921 sglist_init(&sg, VTNET_MAX_TX_SEGS, segs); 1922 error = sglist_append(&sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 1923 KASSERT(error == 0 && sg.sg_nseg == 1, 1924 ("cannot add header to sglist")); 1925 1926 again: 1927 error = sglist_append_mbuf(&sg, m); 1928 if (error) { 1929 if (collapsed) 1930 goto fail; 1931 1932 m = m_collapse(m, M_DONTWAIT, VTNET_MAX_TX_SEGS - 1); 1933 if (m == NULL) 1934 goto fail; 1935 1936 *m_head = m; 1937 collapsed = 1; 1938 goto again; 1939 } 1940 1941 txhdr->vth_mbuf = m; 1942 1943 return (virtqueue_enqueue(vq, txhdr, &sg, sg.sg_nseg, 0)); 1944 1945 fail: 1946 m_freem(*m_head); 1947 *m_head = NULL; 1948 1949 return (ENOBUFS); 1950 } 1951 1952 static int 1953 vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head) 1954 { 1955 struct vtnet_tx_header *txhdr; 1956 struct virtio_net_hdr *hdr; 1957 struct mbuf *m; 1958 int error; 1959 1960 m = *m_head; 1961 1962 txhdr = uma_zalloc(vtnet_tx_header_zone, M_NOWAIT | M_ZERO); 1963 if (txhdr == NULL) { 1964 *m_head = NULL; 1965 m_freem(m); 1966 return (ENOMEM); 1967 } 1968 1969 /* 1970 * Always use the non-mergeable header to simplify things. When 1971 * the mergeable feature is negotiated, the num_buffers field 1972 * must be set to zero. We use vtnet_hdr_size later to enqueue 1973 * the correct header size to the host. 1974 */ 1975 hdr = &txhdr->vth_uhdr.hdr; 1976 1977 if (m->m_flags & M_VLANTAG) { 1978 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1979 if ((*m_head = m) == NULL) { 1980 error = ENOBUFS; 1981 goto fail; 1982 } 1983 m->m_flags &= ~M_VLANTAG; 1984 } 1985 1986 if (m->m_pkthdr.csum_flags != 0) { 1987 m = vtnet_tx_offload(sc, m, hdr); 1988 if ((*m_head = m) == NULL) { 1989 error = ENOBUFS; 1990 goto fail; 1991 } 1992 } 1993 1994 error = vtnet_enqueue_txbuf(sc, m_head, txhdr); 1995 fail: 1996 if (error) 1997 uma_zfree(vtnet_tx_header_zone, txhdr); 1998 1999 return (error); 2000 } 2001 2002 static void 2003 vtnet_start(struct ifnet *ifp) 2004 { 2005 struct vtnet_softc *sc; 2006 2007 sc = ifp->if_softc; 2008 2009 VTNET_LOCK(sc); 2010 vtnet_start_locked(ifp); 2011 VTNET_UNLOCK(sc); 2012 } 2013 2014 static void 2015 vtnet_start_locked(struct ifnet *ifp) 2016 { 2017 struct vtnet_softc *sc; 2018 struct virtqueue *vq; 2019 struct mbuf *m0; 2020 int enq; 2021 2022 sc = ifp->if_softc; 2023 vq = sc->vtnet_tx_vq; 2024 enq = 0; 2025 2026 VTNET_LOCK_ASSERT(sc); 2027 2028 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 2029 IFF_DRV_RUNNING || ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) 2030 return; 2031 2032 #ifdef VTNET_TX_INTR_MODERATION 2033 if (virtqueue_nused(vq) >= sc->vtnet_tx_size / 2) 2034 vtnet_txeof(sc); 2035 #endif 2036 2037 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2038 if (virtqueue_full(vq)) { 2039 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 2040 break; 2041 } 2042 2043 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2044 if (m0 == NULL) 2045 break; 2046 2047 if (vtnet_encap(sc, &m0) != 0) { 2048 if (m0 == NULL) 2049 break; 2050 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2051 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 2052 break; 2053 } 2054 2055 enq++; 2056 ETHER_BPF_MTAP(ifp, m0); 2057 } 2058 2059 if (enq > 0) { 2060 virtqueue_notify(vq); 2061 sc->vtnet_watchdog_timer = VTNET_WATCHDOG_TIMEOUT; 2062 } 2063 } 2064 2065 static void 2066 vtnet_tick(void *xsc) 2067 { 2068 struct vtnet_softc *sc; 2069 2070 sc = xsc; 2071 2072 VTNET_LOCK_ASSERT(sc); 2073 #ifdef VTNET_DEBUG 2074 virtqueue_dump(sc->vtnet_rx_vq); 2075 virtqueue_dump(sc->vtnet_tx_vq); 2076 #endif 2077 2078 vtnet_watchdog(sc); 2079 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 2080 } 2081 2082 static void 2083 vtnet_tx_intr_task(void *arg, int pending) 2084 { 2085 struct vtnet_softc *sc; 2086 struct ifnet *ifp; 2087 2088 sc = arg; 2089 ifp = sc->vtnet_ifp; 2090 2091 VTNET_LOCK(sc); 2092 2093 #ifdef DEVICE_POLLING 2094 if (ifp->if_capenable & IFCAP_POLLING) { 2095 VTNET_UNLOCK(sc); 2096 return; 2097 } 2098 #endif 2099 2100 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2101 vtnet_enable_tx_intr(sc); 2102 VTNET_UNLOCK(sc); 2103 return; 2104 } 2105 2106 vtnet_txeof(sc); 2107 2108 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2109 vtnet_start_locked(ifp); 2110 2111 if (vtnet_enable_tx_intr(sc) != 0) { 2112 vtnet_disable_tx_intr(sc); 2113 sc->vtnet_stats.tx_task_rescheduled++; 2114 VTNET_UNLOCK(sc); 2115 taskqueue_enqueue_fast(sc->vtnet_tq, &sc->vtnet_tx_intr_task); 2116 return; 2117 } 2118 2119 VTNET_UNLOCK(sc); 2120 } 2121 2122 static int 2123 vtnet_tx_vq_intr(void *xsc) 2124 { 2125 struct vtnet_softc *sc; 2126 2127 sc = xsc; 2128 2129 vtnet_disable_tx_intr(sc); 2130 taskqueue_enqueue_fast(sc->vtnet_tq, &sc->vtnet_tx_intr_task); 2131 2132 return (1); 2133 } 2134 2135 static void 2136 vtnet_stop(struct vtnet_softc *sc) 2137 { 2138 device_t dev; 2139 struct ifnet *ifp; 2140 2141 dev = sc->vtnet_dev; 2142 ifp = sc->vtnet_ifp; 2143 2144 VTNET_LOCK_ASSERT(sc); 2145 2146 sc->vtnet_watchdog_timer = 0; 2147 callout_stop(&sc->vtnet_tick_ch); 2148 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 2149 2150 vtnet_disable_rx_intr(sc); 2151 vtnet_disable_tx_intr(sc); 2152 2153 /* 2154 * Stop the host VirtIO adapter. Note this will reset the host 2155 * adapter's state back to the pre-initialized state, so in 2156 * order to make the device usable again, we must drive it 2157 * through virtio_reinit() and virtio_reinit_complete(). 2158 */ 2159 virtio_stop(dev); 2160 2161 sc->vtnet_flags &= ~VTNET_FLAG_LINK; 2162 2163 vtnet_free_rx_mbufs(sc); 2164 vtnet_free_tx_mbufs(sc); 2165 } 2166 2167 static int 2168 vtnet_reinit(struct vtnet_softc *sc) 2169 { 2170 struct ifnet *ifp; 2171 uint64_t features; 2172 2173 ifp = sc->vtnet_ifp; 2174 features = sc->vtnet_features; 2175 2176 /* 2177 * Re-negotiate with the host, removing any disabled receive 2178 * features. Transmit features are disabled only on our side 2179 * via if_capenable and if_hwassist. 2180 */ 2181 2182 if (ifp->if_capabilities & IFCAP_RXCSUM) { 2183 if ((ifp->if_capenable & IFCAP_RXCSUM) == 0) 2184 features &= ~VIRTIO_NET_F_GUEST_CSUM; 2185 } 2186 2187 if (ifp->if_capabilities & IFCAP_LRO) { 2188 if ((ifp->if_capenable & IFCAP_LRO) == 0) 2189 features &= ~VTNET_LRO_FEATURES; 2190 } 2191 2192 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) { 2193 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 2194 features &= ~VIRTIO_NET_F_CTRL_VLAN; 2195 } 2196 2197 return (virtio_reinit(sc->vtnet_dev, features)); 2198 } 2199 2200 static void 2201 vtnet_init_locked(struct vtnet_softc *sc) 2202 { 2203 device_t dev; 2204 struct ifnet *ifp; 2205 int error; 2206 2207 dev = sc->vtnet_dev; 2208 ifp = sc->vtnet_ifp; 2209 2210 VTNET_LOCK_ASSERT(sc); 2211 2212 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 2213 return; 2214 2215 /* Stop host's adapter, cancel any pending I/O. */ 2216 vtnet_stop(sc); 2217 2218 /* Reinitialize the host device. */ 2219 error = vtnet_reinit(sc); 2220 if (error) { 2221 device_printf(dev, 2222 "reinitialization failed, stopping device...\n"); 2223 vtnet_stop(sc); 2224 return; 2225 } 2226 2227 /* Update host with assigned MAC address. */ 2228 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 2229 vtnet_set_hwaddr(sc); 2230 2231 ifp->if_hwassist = 0; 2232 if (ifp->if_capenable & IFCAP_TXCSUM) 2233 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 2234 if (ifp->if_capenable & IFCAP_TSO4) 2235 ifp->if_hwassist |= CSUM_TSO; 2236 2237 error = vtnet_init_rx_vq(sc); 2238 if (error) { 2239 device_printf(dev, 2240 "cannot allocate mbufs for Rx virtqueue\n"); 2241 vtnet_stop(sc); 2242 return; 2243 } 2244 2245 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 2246 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 2247 /* Restore promiscuous and all-multicast modes. */ 2248 vtnet_rx_filter(sc); 2249 2250 /* Restore filtered MAC addresses. */ 2251 vtnet_rx_filter_mac(sc); 2252 } 2253 2254 /* Restore VLAN filters. */ 2255 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 2256 vtnet_rx_filter_vlan(sc); 2257 } 2258 2259 #ifdef DEVICE_POLLING 2260 if (ifp->if_capenable & IFCAP_POLLING) { 2261 vtnet_disable_rx_intr(sc); 2262 vtnet_disable_tx_intr(sc); 2263 } else 2264 #endif 2265 { 2266 vtnet_enable_rx_intr(sc); 2267 vtnet_enable_tx_intr(sc); 2268 } 2269 2270 ifp->if_drv_flags |= IFF_DRV_RUNNING; 2271 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 2272 2273 virtio_reinit_complete(dev); 2274 2275 vtnet_update_link_status(sc); 2276 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 2277 } 2278 2279 static void 2280 vtnet_init(void *xsc) 2281 { 2282 struct vtnet_softc *sc; 2283 2284 sc = xsc; 2285 2286 VTNET_LOCK(sc); 2287 vtnet_init_locked(sc); 2288 VTNET_UNLOCK(sc); 2289 } 2290 2291 static void 2292 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 2293 struct sglist *sg, int readable, int writable) 2294 { 2295 struct virtqueue *vq; 2296 void *c; 2297 2298 vq = sc->vtnet_ctrl_vq; 2299 2300 VTNET_LOCK_ASSERT(sc); 2301 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ, 2302 ("no control virtqueue")); 2303 KASSERT(virtqueue_empty(vq), 2304 ("control command already enqueued")); 2305 2306 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0) 2307 return; 2308 2309 virtqueue_notify(vq); 2310 2311 /* 2312 * Poll until the command is complete. Previously, we would 2313 * sleep until the control virtqueue interrupt handler woke 2314 * us up, but dropping the VTNET_MTX leads to serialization 2315 * difficulties. 2316 * 2317 * Furthermore, it appears QEMU/KVM only allocates three MSIX 2318 * vectors. Two of those vectors are needed for the Rx and Tx 2319 * virtqueues. We do not support sharing both a Vq and config 2320 * changed notification on the same MSIX vector. 2321 */ 2322 c = virtqueue_poll(vq, NULL); 2323 KASSERT(c == cookie, ("unexpected control command response")); 2324 } 2325 2326 static void 2327 vtnet_rx_filter(struct vtnet_softc *sc) 2328 { 2329 device_t dev; 2330 struct ifnet *ifp; 2331 2332 dev = sc->vtnet_dev; 2333 ifp = sc->vtnet_ifp; 2334 2335 VTNET_LOCK_ASSERT(sc); 2336 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 2337 ("CTRL_RX feature not negotiated")); 2338 2339 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) 2340 device_printf(dev, "cannot %s promiscuous mode\n", 2341 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 2342 2343 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) 2344 device_printf(dev, "cannot %s all-multicast mode\n", 2345 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 2346 } 2347 2348 static int 2349 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on) 2350 { 2351 struct virtio_net_ctrl_hdr hdr; 2352 struct sglist_seg segs[3]; 2353 struct sglist sg; 2354 uint8_t onoff, ack; 2355 int error; 2356 2357 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 2358 return (ENOTSUP); 2359 2360 error = 0; 2361 2362 hdr.class = VIRTIO_NET_CTRL_RX; 2363 hdr.cmd = cmd; 2364 onoff = !!on; 2365 ack = VIRTIO_NET_ERR; 2366 2367 sglist_init(&sg, 3, segs); 2368 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2369 error |= sglist_append(&sg, &onoff, sizeof(uint8_t)); 2370 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2371 KASSERT(error == 0 && sg.sg_nseg == 3, 2372 ("error adding Rx filter message to sglist")); 2373 2374 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2375 2376 return (ack == VIRTIO_NET_OK ? 0 : EIO); 2377 } 2378 2379 static int 2380 vtnet_set_promisc(struct vtnet_softc *sc, int on) 2381 { 2382 2383 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 2384 } 2385 2386 static int 2387 vtnet_set_allmulti(struct vtnet_softc *sc, int on) 2388 { 2389 2390 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 2391 } 2392 2393 static void 2394 vtnet_rx_filter_mac(struct vtnet_softc *sc) 2395 { 2396 struct virtio_net_ctrl_hdr hdr; 2397 struct vtnet_mac_filter *filter; 2398 struct sglist_seg segs[4]; 2399 struct sglist sg; 2400 struct ifnet *ifp; 2401 struct ifaddr *ifa; 2402 struct ifmultiaddr *ifma; 2403 int ucnt, mcnt, promisc, allmulti, error; 2404 uint8_t ack; 2405 2406 ifp = sc->vtnet_ifp; 2407 filter = sc->vtnet_mac_filter; 2408 ucnt = 0; 2409 mcnt = 0; 2410 promisc = 0; 2411 allmulti = 0; 2412 error = 0; 2413 2414 VTNET_LOCK_ASSERT(sc); 2415 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 2416 ("CTRL_RX feature not negotiated")); 2417 2418 /* Unicast MAC addresses: */ 2419 if_addr_rlock(ifp); 2420 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2421 if (ifa->ifa_addr->sa_family != AF_LINK) 2422 continue; 2423 else if (ucnt == VTNET_MAX_MAC_ENTRIES) 2424 break; 2425 2426 bcopy(LLADDR((struct sockaddr_dl *)ifa->ifa_addr), 2427 &filter->vmf_unicast.macs[ucnt], ETHER_ADDR_LEN); 2428 ucnt++; 2429 } 2430 if_addr_runlock(ifp); 2431 2432 if (ucnt >= VTNET_MAX_MAC_ENTRIES) { 2433 promisc = 1; 2434 filter->vmf_unicast.nentries = 0; 2435 2436 if_printf(ifp, "more than %d MAC addresses assigned, " 2437 "falling back to promiscuous mode\n", 2438 VTNET_MAX_MAC_ENTRIES); 2439 } else 2440 filter->vmf_unicast.nentries = ucnt; 2441 2442 /* Multicast MAC addresses: */ 2443 if_maddr_rlock(ifp); 2444 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2445 if (ifma->ifma_addr->sa_family != AF_LINK) 2446 continue; 2447 else if (mcnt == VTNET_MAX_MAC_ENTRIES) 2448 break; 2449 2450 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 2451 &filter->vmf_multicast.macs[mcnt], ETHER_ADDR_LEN); 2452 mcnt++; 2453 } 2454 if_maddr_runlock(ifp); 2455 2456 if (mcnt >= VTNET_MAX_MAC_ENTRIES) { 2457 allmulti = 1; 2458 filter->vmf_multicast.nentries = 0; 2459 2460 if_printf(ifp, "more than %d multicast MAC addresses " 2461 "assigned, falling back to all-multicast mode\n", 2462 VTNET_MAX_MAC_ENTRIES); 2463 } else 2464 filter->vmf_multicast.nentries = mcnt; 2465 2466 if (promisc && allmulti) 2467 goto out; 2468 2469 hdr.class = VIRTIO_NET_CTRL_MAC; 2470 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 2471 ack = VIRTIO_NET_ERR; 2472 2473 sglist_init(&sg, 4, segs); 2474 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2475 error |= sglist_append(&sg, &filter->vmf_unicast, 2476 sizeof(struct vtnet_mac_table)); 2477 error |= sglist_append(&sg, &filter->vmf_multicast, 2478 sizeof(struct vtnet_mac_table)); 2479 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2480 KASSERT(error == 0 && sg.sg_nseg == 4, 2481 ("error adding MAC filtering message to sglist")); 2482 2483 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2484 2485 if (ack != VIRTIO_NET_OK) 2486 if_printf(ifp, "error setting host MAC filter table\n"); 2487 2488 out: 2489 if (promisc) 2490 if (vtnet_set_promisc(sc, 1) != 0) 2491 if_printf(ifp, "cannot enable promiscuous mode\n"); 2492 if (allmulti) 2493 if (vtnet_set_allmulti(sc, 1) != 0) 2494 if_printf(ifp, "cannot enable all-multicast mode\n"); 2495 } 2496 2497 static int 2498 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 2499 { 2500 struct virtio_net_ctrl_hdr hdr; 2501 struct sglist_seg segs[3]; 2502 struct sglist sg; 2503 uint8_t ack; 2504 int error; 2505 2506 hdr.class = VIRTIO_NET_CTRL_VLAN; 2507 hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 2508 ack = VIRTIO_NET_ERR; 2509 error = 0; 2510 2511 sglist_init(&sg, 3, segs); 2512 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2513 error |= sglist_append(&sg, &tag, sizeof(uint16_t)); 2514 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2515 KASSERT(error == 0 && sg.sg_nseg == 3, 2516 ("error adding VLAN control message to sglist")); 2517 2518 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2519 2520 return (ack == VIRTIO_NET_OK ? 0 : EIO); 2521 } 2522 2523 static void 2524 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 2525 { 2526 device_t dev; 2527 uint32_t w, mask; 2528 uint16_t tag; 2529 int i, nvlans, error; 2530 2531 VTNET_LOCK_ASSERT(sc); 2532 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 2533 ("VLAN_FILTER feature not negotiated")); 2534 2535 dev = sc->vtnet_dev; 2536 nvlans = sc->vtnet_nvlans; 2537 error = 0; 2538 2539 /* Enable filtering for each configured VLAN. */ 2540 for (i = 0; i < VTNET_VLAN_SHADOW_SIZE && nvlans > 0; i++) { 2541 w = sc->vtnet_vlan_shadow[i]; 2542 for (mask = 1, tag = i * 32; w != 0; mask <<= 1, tag++) { 2543 if ((w & mask) != 0) { 2544 w &= ~mask; 2545 nvlans--; 2546 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) 2547 error++; 2548 } 2549 } 2550 } 2551 2552 KASSERT(nvlans == 0, ("VLAN count incorrect")); 2553 if (error) 2554 device_printf(dev, "cannot restore VLAN filter table\n"); 2555 } 2556 2557 static void 2558 vtnet_set_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 2559 { 2560 struct ifnet *ifp; 2561 int idx, bit; 2562 2563 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 2564 ("VLAN_FILTER feature not negotiated")); 2565 2566 if ((tag == 0) || (tag > 4095)) 2567 return; 2568 2569 ifp = sc->vtnet_ifp; 2570 idx = (tag >> 5) & 0x7F; 2571 bit = tag & 0x1F; 2572 2573 VTNET_LOCK(sc); 2574 2575 /* Update shadow VLAN table. */ 2576 if (add) { 2577 sc->vtnet_nvlans++; 2578 sc->vtnet_vlan_shadow[idx] |= (1 << bit); 2579 } else { 2580 sc->vtnet_nvlans--; 2581 sc->vtnet_vlan_shadow[idx] &= ~(1 << bit); 2582 } 2583 2584 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) { 2585 if (vtnet_exec_vlan_filter(sc, add, tag) != 0) { 2586 device_printf(sc->vtnet_dev, 2587 "cannot %s VLAN %d %s the host filter table\n", 2588 add ? "add" : "remove", tag, 2589 add ? "to" : "from"); 2590 } 2591 } 2592 2593 VTNET_UNLOCK(sc); 2594 } 2595 2596 static void 2597 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 2598 { 2599 2600 if (ifp->if_softc != arg) 2601 return; 2602 2603 vtnet_set_vlan_filter(arg, 1, tag); 2604 } 2605 2606 static void 2607 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 2608 { 2609 2610 if (ifp->if_softc != arg) 2611 return; 2612 2613 vtnet_set_vlan_filter(arg, 0, tag); 2614 } 2615 2616 static int 2617 vtnet_ifmedia_upd(struct ifnet *ifp) 2618 { 2619 struct vtnet_softc *sc; 2620 struct ifmedia *ifm; 2621 2622 sc = ifp->if_softc; 2623 ifm = &sc->vtnet_media; 2624 2625 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) 2626 return (EINVAL); 2627 2628 return (0); 2629 } 2630 2631 static void 2632 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 2633 { 2634 struct vtnet_softc *sc; 2635 2636 sc = ifp->if_softc; 2637 2638 ifmr->ifm_status = IFM_AVALID; 2639 ifmr->ifm_active = IFM_ETHER; 2640 2641 VTNET_LOCK(sc); 2642 if (vtnet_is_link_up(sc) != 0) { 2643 ifmr->ifm_status |= IFM_ACTIVE; 2644 ifmr->ifm_active |= VTNET_MEDIATYPE; 2645 } else 2646 ifmr->ifm_active |= IFM_NONE; 2647 VTNET_UNLOCK(sc); 2648 } 2649 2650 static void 2651 vtnet_add_statistics(struct vtnet_softc *sc) 2652 { 2653 device_t dev; 2654 struct vtnet_statistics *stats; 2655 struct sysctl_ctx_list *ctx; 2656 struct sysctl_oid *tree; 2657 struct sysctl_oid_list *child; 2658 2659 dev = sc->vtnet_dev; 2660 stats = &sc->vtnet_stats; 2661 ctx = device_get_sysctl_ctx(dev); 2662 tree = device_get_sysctl_tree(dev); 2663 child = SYSCTL_CHILDREN(tree); 2664 2665 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "mbuf_alloc_failed", 2666 CTLFLAG_RD, &stats->mbuf_alloc_failed, 2667 "Mbuf cluster allocation failures"); 2668 2669 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_frame_too_large", 2670 CTLFLAG_RD, &stats->rx_frame_too_large, 2671 "Received frame larger than the mbuf chain"); 2672 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 2673 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 2674 "Enqueuing the replacement receive mbuf failed"); 2675 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_mergeable_failed", 2676 CTLFLAG_RD, &stats->rx_mergeable_failed, 2677 "Mergeable buffers receive failures"); 2678 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 2679 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 2680 "Received checksum offloaded buffer with unsupported " 2681 "Ethernet type"); 2682 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_start", 2683 CTLFLAG_RD, &stats->rx_csum_bad_start, 2684 "Received checksum offloaded buffer with incorrect start offset"); 2685 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 2686 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 2687 "Received checksum offloaded buffer with incorrect IP protocol"); 2688 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_offset", 2689 CTLFLAG_RD, &stats->rx_csum_bad_offset, 2690 "Received checksum offloaded buffer with incorrect offset"); 2691 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_failed", 2692 CTLFLAG_RD, &stats->rx_csum_failed, 2693 "Received buffer checksum offload failed"); 2694 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_offloaded", 2695 CTLFLAG_RD, &stats->rx_csum_offloaded, 2696 "Received buffer checksum offload succeeded"); 2697 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_task_rescheduled", 2698 CTLFLAG_RD, &stats->rx_task_rescheduled, 2699 "Times the receive interrupt task rescheduled itself"); 2700 2701 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_csum_offloaded", 2702 CTLFLAG_RD, &stats->tx_csum_offloaded, 2703 "Offloaded checksum of transmitted buffer"); 2704 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_tso_offloaded", 2705 CTLFLAG_RD, &stats->tx_tso_offloaded, 2706 "Segmentation offload of transmitted buffer"); 2707 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_csum_bad_ethtype", 2708 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 2709 "Aborted transmit of checksum offloaded buffer with unknown " 2710 "Ethernet type"); 2711 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_tso_bad_ethtype", 2712 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 2713 "Aborted transmit of TSO buffer with unknown Ethernet type"); 2714 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_task_rescheduled", 2715 CTLFLAG_RD, &stats->tx_task_rescheduled, 2716 "Times the transmit interrupt task rescheduled itself"); 2717 } 2718 2719 static int 2720 vtnet_enable_rx_intr(struct vtnet_softc *sc) 2721 { 2722 2723 return (virtqueue_enable_intr(sc->vtnet_rx_vq)); 2724 } 2725 2726 static void 2727 vtnet_disable_rx_intr(struct vtnet_softc *sc) 2728 { 2729 2730 virtqueue_disable_intr(sc->vtnet_rx_vq); 2731 } 2732 2733 static int 2734 vtnet_enable_tx_intr(struct vtnet_softc *sc) 2735 { 2736 2737 #ifdef VTNET_TX_INTR_MODERATION 2738 return (0); 2739 #else 2740 return (virtqueue_enable_intr(sc->vtnet_tx_vq)); 2741 #endif 2742 } 2743 2744 static void 2745 vtnet_disable_tx_intr(struct vtnet_softc *sc) 2746 { 2747 2748 virtqueue_disable_intr(sc->vtnet_tx_vq); 2749 } 2750