1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/eventhandler.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/sockio.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 #include <sys/socket.h> 43 #include <sys/sysctl.h> 44 #include <sys/random.h> 45 #include <sys/sglist.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/taskqueue.h> 49 #include <sys/smp.h> 50 #include <machine/smp.h> 51 52 #include <vm/uma.h> 53 54 #include <net/debugnet.h> 55 #include <net/ethernet.h> 56 #include <net/pfil.h> 57 #include <net/if.h> 58 #include <net/if_var.h> 59 #include <net/if_arp.h> 60 #include <net/if_dl.h> 61 #include <net/if_types.h> 62 #include <net/if_media.h> 63 #include <net/if_vlan_var.h> 64 65 #include <net/bpf.h> 66 67 #include <netinet/in_systm.h> 68 #include <netinet/in.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip6.h> 71 #include <netinet6/ip6_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/tcp.h> 74 75 #include <machine/bus.h> 76 #include <machine/resource.h> 77 #include <sys/bus.h> 78 #include <sys/rman.h> 79 80 #include <dev/virtio/virtio.h> 81 #include <dev/virtio/virtqueue.h> 82 #include <dev/virtio/network/virtio_net.h> 83 #include <dev/virtio/network/if_vtnetvar.h> 84 #include "virtio_if.h" 85 86 #include "opt_inet.h" 87 #include "opt_inet6.h" 88 89 static int vtnet_modevent(module_t, int, void *); 90 91 static int vtnet_probe(device_t); 92 static int vtnet_attach(device_t); 93 static int vtnet_detach(device_t); 94 static int vtnet_suspend(device_t); 95 static int vtnet_resume(device_t); 96 static int vtnet_shutdown(device_t); 97 static int vtnet_attach_completed(device_t); 98 static int vtnet_config_change(device_t); 99 100 static void vtnet_negotiate_features(struct vtnet_softc *); 101 static void vtnet_setup_features(struct vtnet_softc *); 102 static int vtnet_init_rxq(struct vtnet_softc *, int); 103 static int vtnet_init_txq(struct vtnet_softc *, int); 104 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 105 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 106 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 107 static void vtnet_free_rx_filters(struct vtnet_softc *); 108 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 109 static int vtnet_setup_interface(struct vtnet_softc *); 110 static int vtnet_change_mtu(struct vtnet_softc *, int); 111 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 112 static uint64_t vtnet_get_counter(struct ifnet *, ift_counter); 113 114 static int vtnet_rxq_populate(struct vtnet_rxq *); 115 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 116 static struct mbuf * 117 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 118 static int vtnet_rxq_replace_lro_nomgr_buf(struct vtnet_rxq *, 119 struct mbuf *, int); 120 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 121 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 122 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 123 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 124 struct virtio_net_hdr *); 125 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 126 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 127 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 128 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 129 struct virtio_net_hdr *); 130 static int vtnet_rxq_eof(struct vtnet_rxq *); 131 static void vtnet_rx_vq_intr(void *); 132 static void vtnet_rxq_tq_intr(void *, int); 133 134 static int vtnet_txq_below_threshold(struct vtnet_txq *); 135 static int vtnet_txq_notify(struct vtnet_txq *); 136 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 137 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 138 int *, int *, int *); 139 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 140 int, struct virtio_net_hdr *); 141 static struct mbuf * 142 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 143 struct virtio_net_hdr *); 144 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 145 struct vtnet_tx_header *); 146 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 147 #ifdef VTNET_LEGACY_TX 148 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 149 static void vtnet_start(struct ifnet *); 150 #else 151 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 152 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 153 static void vtnet_txq_tq_deferred(void *, int); 154 #endif 155 static void vtnet_txq_start(struct vtnet_txq *); 156 static void vtnet_txq_tq_intr(void *, int); 157 static int vtnet_txq_eof(struct vtnet_txq *); 158 static void vtnet_tx_vq_intr(void *); 159 static void vtnet_tx_start_all(struct vtnet_softc *); 160 161 #ifndef VTNET_LEGACY_TX 162 static void vtnet_qflush(struct ifnet *); 163 #endif 164 165 static int vtnet_watchdog(struct vtnet_txq *); 166 static void vtnet_accum_stats(struct vtnet_softc *, 167 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 168 static void vtnet_tick(void *); 169 170 static void vtnet_start_taskqueues(struct vtnet_softc *); 171 static void vtnet_free_taskqueues(struct vtnet_softc *); 172 static void vtnet_drain_taskqueues(struct vtnet_softc *); 173 174 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 175 static void vtnet_stop_rendezvous(struct vtnet_softc *); 176 static void vtnet_stop(struct vtnet_softc *); 177 static int vtnet_virtio_reinit(struct vtnet_softc *); 178 static void vtnet_init_rx_filters(struct vtnet_softc *); 179 static int vtnet_init_rx_queues(struct vtnet_softc *); 180 static int vtnet_init_tx_queues(struct vtnet_softc *); 181 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 182 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 183 static int vtnet_reinit(struct vtnet_softc *); 184 static void vtnet_init_locked(struct vtnet_softc *); 185 static void vtnet_init(void *); 186 187 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 188 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 189 struct sglist *, int, int); 190 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 191 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 192 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int); 193 static int vtnet_set_promisc(struct vtnet_softc *, int); 194 static int vtnet_set_allmulti(struct vtnet_softc *, int); 195 static void vtnet_attach_disable_promisc(struct vtnet_softc *); 196 static void vtnet_rx_filter(struct vtnet_softc *); 197 static void vtnet_rx_filter_mac(struct vtnet_softc *); 198 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 199 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 200 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 201 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 202 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 203 204 static int vtnet_is_link_up(struct vtnet_softc *); 205 static void vtnet_update_link_status(struct vtnet_softc *); 206 static int vtnet_ifmedia_upd(struct ifnet *); 207 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 208 static void vtnet_get_hwaddr(struct vtnet_softc *); 209 static void vtnet_set_hwaddr(struct vtnet_softc *); 210 static void vtnet_vlan_tag_remove(struct mbuf *); 211 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 212 static void vtnet_set_tx_intr_threshold(struct vtnet_softc *); 213 214 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 215 struct sysctl_oid_list *, struct vtnet_rxq *); 216 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 217 struct sysctl_oid_list *, struct vtnet_txq *); 218 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 219 static void vtnet_setup_sysctl(struct vtnet_softc *); 220 221 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 222 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 223 static int vtnet_txq_enable_intr(struct vtnet_txq *); 224 static void vtnet_txq_disable_intr(struct vtnet_txq *); 225 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 226 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 227 static void vtnet_enable_interrupts(struct vtnet_softc *); 228 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 229 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 230 static void vtnet_disable_interrupts(struct vtnet_softc *); 231 232 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 233 234 DEBUGNET_DEFINE(vtnet); 235 236 /* Tunables. */ 237 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 238 "VNET driver parameters"); 239 static int vtnet_csum_disable = 0; 240 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable); 241 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 242 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 243 static int vtnet_tso_disable = 0; 244 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable); 245 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, &vtnet_tso_disable, 246 0, "Disables TCP Segmentation Offload"); 247 static int vtnet_lro_disable = 0; 248 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable); 249 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, &vtnet_lro_disable, 250 0, "Disables TCP Large Receive Offload"); 251 static int vtnet_mq_disable = 0; 252 TUNABLE_INT("hw.vtnet.mq_disable", &vtnet_mq_disable); 253 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, &vtnet_mq_disable, 254 0, "Disables Multi Queue support"); 255 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 256 TUNABLE_INT("hw.vtnet.mq_max_pairs", &vtnet_mq_max_pairs); 257 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 258 &vtnet_mq_max_pairs, 0, "Sets the maximum number of Multi Queue pairs"); 259 static int vtnet_rx_process_limit = 512; 260 TUNABLE_INT("hw.vtnet.rx_process_limit", &vtnet_rx_process_limit); 261 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 262 &vtnet_rx_process_limit, 0, 263 "Limits the number RX segments processed in a single pass"); 264 265 static uma_zone_t vtnet_tx_header_zone; 266 267 static struct virtio_feature_desc vtnet_feature_desc[] = { 268 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 269 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 270 { VIRTIO_NET_F_MAC, "MacAddress" }, 271 { VIRTIO_NET_F_GSO, "TxAllGSO" }, 272 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" }, 273 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" }, 274 { VIRTIO_NET_F_GUEST_ECN, "RxECN" }, 275 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 276 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 277 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 278 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 279 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 280 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 281 { VIRTIO_NET_F_STATUS, "Status" }, 282 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" }, 283 { VIRTIO_NET_F_CTRL_RX, "RxMode" }, 284 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" }, 285 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" }, 286 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 287 { VIRTIO_NET_F_MQ, "Multiqueue" }, 288 { VIRTIO_NET_F_CTRL_MAC_ADDR, "SetMacAddress" }, 289 290 { 0, NULL } 291 }; 292 293 static device_method_t vtnet_methods[] = { 294 /* Device methods. */ 295 DEVMETHOD(device_probe, vtnet_probe), 296 DEVMETHOD(device_attach, vtnet_attach), 297 DEVMETHOD(device_detach, vtnet_detach), 298 DEVMETHOD(device_suspend, vtnet_suspend), 299 DEVMETHOD(device_resume, vtnet_resume), 300 DEVMETHOD(device_shutdown, vtnet_shutdown), 301 302 /* VirtIO methods. */ 303 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 304 DEVMETHOD(virtio_config_change, vtnet_config_change), 305 306 DEVMETHOD_END 307 }; 308 309 #ifdef DEV_NETMAP 310 #include <dev/netmap/if_vtnet_netmap.h> 311 #endif /* DEV_NETMAP */ 312 313 static driver_t vtnet_driver = { 314 "vtnet", 315 vtnet_methods, 316 sizeof(struct vtnet_softc) 317 }; 318 static devclass_t vtnet_devclass; 319 320 DRIVER_MODULE(vtnet, virtio_mmio, vtnet_driver, vtnet_devclass, 321 vtnet_modevent, 0); 322 DRIVER_MODULE(vtnet, virtio_pci, vtnet_driver, vtnet_devclass, 323 vtnet_modevent, 0); 324 MODULE_VERSION(vtnet, 1); 325 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 326 #ifdef DEV_NETMAP 327 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 328 #endif /* DEV_NETMAP */ 329 330 VIRTIO_SIMPLE_PNPTABLE(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 331 VIRTIO_SIMPLE_PNPINFO(virtio_mmio, vtnet); 332 VIRTIO_SIMPLE_PNPINFO(virtio_pci, vtnet); 333 334 static int 335 vtnet_modevent(module_t mod, int type, void *unused) 336 { 337 int error = 0; 338 static int loaded = 0; 339 340 switch (type) { 341 case MOD_LOAD: 342 if (loaded++ == 0) { 343 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 344 sizeof(struct vtnet_tx_header), 345 NULL, NULL, NULL, NULL, 0, 0); 346 #ifdef DEBUGNET 347 /* 348 * We need to allocate from this zone in the transmit path, so ensure 349 * that we have at least one item per header available. 350 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 351 * buckets 352 */ 353 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 354 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 355 #endif 356 } 357 break; 358 case MOD_QUIESCE: 359 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 360 error = EBUSY; 361 break; 362 case MOD_UNLOAD: 363 if (--loaded == 0) { 364 uma_zdestroy(vtnet_tx_header_zone); 365 vtnet_tx_header_zone = NULL; 366 } 367 break; 368 case MOD_SHUTDOWN: 369 break; 370 default: 371 error = EOPNOTSUPP; 372 break; 373 } 374 375 return (error); 376 } 377 378 static int 379 vtnet_probe(device_t dev) 380 { 381 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 382 } 383 384 static int 385 vtnet_attach(device_t dev) 386 { 387 struct vtnet_softc *sc; 388 int error; 389 390 sc = device_get_softc(dev); 391 sc->vtnet_dev = dev; 392 393 /* Register our feature descriptions. */ 394 virtio_set_feature_desc(dev, vtnet_feature_desc); 395 396 VTNET_CORE_LOCK_INIT(sc); 397 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 398 399 vtnet_setup_sysctl(sc); 400 vtnet_setup_features(sc); 401 402 error = vtnet_alloc_rx_filters(sc); 403 if (error) { 404 device_printf(dev, "cannot allocate Rx filters\n"); 405 goto fail; 406 } 407 408 error = vtnet_alloc_rxtx_queues(sc); 409 if (error) { 410 device_printf(dev, "cannot allocate queues\n"); 411 goto fail; 412 } 413 414 error = vtnet_alloc_virtqueues(sc); 415 if (error) { 416 device_printf(dev, "cannot allocate virtqueues\n"); 417 goto fail; 418 } 419 420 error = vtnet_setup_interface(sc); 421 if (error) { 422 device_printf(dev, "cannot setup interface\n"); 423 goto fail; 424 } 425 426 error = virtio_setup_intr(dev, INTR_TYPE_NET); 427 if (error) { 428 device_printf(dev, "cannot setup virtqueue interrupts\n"); 429 /* BMV: This will crash if during boot! */ 430 ether_ifdetach(sc->vtnet_ifp); 431 goto fail; 432 } 433 434 #ifdef DEV_NETMAP 435 vtnet_netmap_attach(sc); 436 #endif /* DEV_NETMAP */ 437 438 vtnet_start_taskqueues(sc); 439 440 fail: 441 if (error) 442 vtnet_detach(dev); 443 444 return (error); 445 } 446 447 static int 448 vtnet_detach(device_t dev) 449 { 450 struct vtnet_softc *sc; 451 struct ifnet *ifp; 452 453 sc = device_get_softc(dev); 454 ifp = sc->vtnet_ifp; 455 456 if (device_is_attached(dev)) { 457 VTNET_CORE_LOCK(sc); 458 vtnet_stop(sc); 459 VTNET_CORE_UNLOCK(sc); 460 461 callout_drain(&sc->vtnet_tick_ch); 462 vtnet_drain_taskqueues(sc); 463 464 ether_ifdetach(ifp); 465 } 466 467 #ifdef DEV_NETMAP 468 netmap_detach(ifp); 469 #endif /* DEV_NETMAP */ 470 471 vtnet_free_taskqueues(sc); 472 473 if (sc->vtnet_vlan_attach != NULL) { 474 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 475 sc->vtnet_vlan_attach = NULL; 476 } 477 if (sc->vtnet_vlan_detach != NULL) { 478 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 479 sc->vtnet_vlan_detach = NULL; 480 } 481 482 ifmedia_removeall(&sc->vtnet_media); 483 484 if (ifp != NULL) { 485 if_free(ifp); 486 sc->vtnet_ifp = NULL; 487 } 488 489 vtnet_free_rxtx_queues(sc); 490 vtnet_free_rx_filters(sc); 491 492 if (sc->vtnet_ctrl_vq != NULL) 493 vtnet_free_ctrl_vq(sc); 494 495 VTNET_CORE_LOCK_DESTROY(sc); 496 497 return (0); 498 } 499 500 static int 501 vtnet_suspend(device_t dev) 502 { 503 struct vtnet_softc *sc; 504 505 sc = device_get_softc(dev); 506 507 VTNET_CORE_LOCK(sc); 508 vtnet_stop(sc); 509 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 510 VTNET_CORE_UNLOCK(sc); 511 512 return (0); 513 } 514 515 static int 516 vtnet_resume(device_t dev) 517 { 518 struct vtnet_softc *sc; 519 struct ifnet *ifp; 520 521 sc = device_get_softc(dev); 522 ifp = sc->vtnet_ifp; 523 524 VTNET_CORE_LOCK(sc); 525 if (ifp->if_flags & IFF_UP) 526 vtnet_init_locked(sc); 527 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 528 VTNET_CORE_UNLOCK(sc); 529 530 return (0); 531 } 532 533 static int 534 vtnet_shutdown(device_t dev) 535 { 536 537 /* 538 * Suspend already does all of what we need to 539 * do here; we just never expect to be resumed. 540 */ 541 return (vtnet_suspend(dev)); 542 } 543 544 static int 545 vtnet_attach_completed(device_t dev) 546 { 547 548 vtnet_attach_disable_promisc(device_get_softc(dev)); 549 550 return (0); 551 } 552 553 static int 554 vtnet_config_change(device_t dev) 555 { 556 struct vtnet_softc *sc; 557 558 sc = device_get_softc(dev); 559 560 VTNET_CORE_LOCK(sc); 561 vtnet_update_link_status(sc); 562 if (sc->vtnet_link_active != 0) 563 vtnet_tx_start_all(sc); 564 VTNET_CORE_UNLOCK(sc); 565 566 return (0); 567 } 568 569 static void 570 vtnet_negotiate_features(struct vtnet_softc *sc) 571 { 572 device_t dev; 573 uint64_t mask, features; 574 575 dev = sc->vtnet_dev; 576 mask = 0; 577 578 /* 579 * TSO and LRO are only available when their corresponding checksum 580 * offload feature is also negotiated. 581 */ 582 if (vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable)) { 583 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM; 584 mask |= VTNET_TSO_FEATURES | VTNET_LRO_FEATURES; 585 } 586 if (vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 587 mask |= VTNET_TSO_FEATURES; 588 if (vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 589 mask |= VTNET_LRO_FEATURES; 590 #ifndef VTNET_LEGACY_TX 591 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 592 mask |= VIRTIO_NET_F_MQ; 593 #else 594 mask |= VIRTIO_NET_F_MQ; 595 #endif 596 597 features = VTNET_FEATURES & ~mask; 598 sc->vtnet_features = virtio_negotiate_features(dev, features); 599 600 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 601 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 602 /* 603 * LRO without mergeable buffers requires special care. This 604 * is not ideal because every receive buffer must be large 605 * enough to hold the maximum TCP packet, the Ethernet header, 606 * and the header. This requires up to 34 descriptors with 607 * MCLBYTES clusters. If we do not have indirect descriptors, 608 * LRO is disabled since the virtqueue will not contain very 609 * many receive buffers. 610 */ 611 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 612 device_printf(dev, 613 "LRO disabled due to both mergeable buffers and " 614 "indirect descriptors not negotiated\n"); 615 616 features &= ~VTNET_LRO_FEATURES; 617 sc->vtnet_features = 618 virtio_negotiate_features(dev, features); 619 } else 620 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 621 } 622 } 623 624 static void 625 vtnet_setup_features(struct vtnet_softc *sc) 626 { 627 device_t dev; 628 629 dev = sc->vtnet_dev; 630 631 vtnet_negotiate_features(sc); 632 633 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 634 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 635 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 636 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 637 638 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 639 /* This feature should always be negotiated. */ 640 sc->vtnet_flags |= VTNET_FLAG_MAC; 641 } 642 643 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) 644 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 645 646 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) || 647 virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 648 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 649 else 650 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 651 652 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 653 sc->vtnet_rx_nsegs = VTNET_MRG_RX_SEGS; 654 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 655 sc->vtnet_rx_nsegs = VTNET_MAX_RX_SEGS; 656 else 657 sc->vtnet_rx_nsegs = VTNET_MIN_RX_SEGS; 658 659 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 660 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 661 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 662 sc->vtnet_tx_nsegs = VTNET_MAX_TX_SEGS; 663 else 664 sc->vtnet_tx_nsegs = VTNET_MIN_TX_SEGS; 665 666 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 667 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 668 669 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 670 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 671 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 672 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 673 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 674 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 675 } 676 677 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ) && 678 sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 679 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 680 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 681 } else 682 sc->vtnet_max_vq_pairs = 1; 683 684 if (sc->vtnet_max_vq_pairs > 1) { 685 /* 686 * Limit the maximum number of queue pairs to the lower of 687 * the number of CPUs and the configured maximum. 688 * The actual number of queues that get used may be less. 689 */ 690 int max; 691 692 max = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 693 if (max > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN) { 694 if (max > mp_ncpus) 695 max = mp_ncpus; 696 if (max > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) 697 max = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX; 698 if (max > 1) { 699 sc->vtnet_requested_vq_pairs = max; 700 sc->vtnet_flags |= VTNET_FLAG_MULTIQ; 701 } 702 } 703 } 704 } 705 706 static int 707 vtnet_init_rxq(struct vtnet_softc *sc, int id) 708 { 709 struct vtnet_rxq *rxq; 710 711 rxq = &sc->vtnet_rxqs[id]; 712 713 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 714 device_get_nameunit(sc->vtnet_dev), id); 715 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 716 717 rxq->vtnrx_sc = sc; 718 rxq->vtnrx_id = id; 719 720 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 721 if (rxq->vtnrx_sg == NULL) 722 return (ENOMEM); 723 724 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 725 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 726 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 727 728 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 729 } 730 731 static int 732 vtnet_init_txq(struct vtnet_softc *sc, int id) 733 { 734 struct vtnet_txq *txq; 735 736 txq = &sc->vtnet_txqs[id]; 737 738 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 739 device_get_nameunit(sc->vtnet_dev), id); 740 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 741 742 txq->vtntx_sc = sc; 743 txq->vtntx_id = id; 744 745 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 746 if (txq->vtntx_sg == NULL) 747 return (ENOMEM); 748 749 #ifndef VTNET_LEGACY_TX 750 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 751 M_NOWAIT, &txq->vtntx_mtx); 752 if (txq->vtntx_br == NULL) 753 return (ENOMEM); 754 755 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 756 #endif 757 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 758 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 759 taskqueue_thread_enqueue, &txq->vtntx_tq); 760 if (txq->vtntx_tq == NULL) 761 return (ENOMEM); 762 763 return (0); 764 } 765 766 static int 767 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 768 { 769 int i, npairs, error; 770 771 npairs = sc->vtnet_max_vq_pairs; 772 773 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 774 M_NOWAIT | M_ZERO); 775 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 776 M_NOWAIT | M_ZERO); 777 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 778 return (ENOMEM); 779 780 for (i = 0; i < npairs; i++) { 781 error = vtnet_init_rxq(sc, i); 782 if (error) 783 return (error); 784 error = vtnet_init_txq(sc, i); 785 if (error) 786 return (error); 787 } 788 789 vtnet_setup_queue_sysctl(sc); 790 791 return (0); 792 } 793 794 static void 795 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 796 { 797 798 rxq->vtnrx_sc = NULL; 799 rxq->vtnrx_id = -1; 800 801 if (rxq->vtnrx_sg != NULL) { 802 sglist_free(rxq->vtnrx_sg); 803 rxq->vtnrx_sg = NULL; 804 } 805 806 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 807 mtx_destroy(&rxq->vtnrx_mtx); 808 } 809 810 static void 811 vtnet_destroy_txq(struct vtnet_txq *txq) 812 { 813 814 txq->vtntx_sc = NULL; 815 txq->vtntx_id = -1; 816 817 if (txq->vtntx_sg != NULL) { 818 sglist_free(txq->vtntx_sg); 819 txq->vtntx_sg = NULL; 820 } 821 822 #ifndef VTNET_LEGACY_TX 823 if (txq->vtntx_br != NULL) { 824 buf_ring_free(txq->vtntx_br, M_DEVBUF); 825 txq->vtntx_br = NULL; 826 } 827 #endif 828 829 if (mtx_initialized(&txq->vtntx_mtx) != 0) 830 mtx_destroy(&txq->vtntx_mtx); 831 } 832 833 static void 834 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 835 { 836 int i; 837 838 if (sc->vtnet_rxqs != NULL) { 839 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 840 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 841 free(sc->vtnet_rxqs, M_DEVBUF); 842 sc->vtnet_rxqs = NULL; 843 } 844 845 if (sc->vtnet_txqs != NULL) { 846 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 847 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 848 free(sc->vtnet_txqs, M_DEVBUF); 849 sc->vtnet_txqs = NULL; 850 } 851 } 852 853 static int 854 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 855 { 856 857 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 858 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 859 M_DEVBUF, M_NOWAIT | M_ZERO); 860 if (sc->vtnet_mac_filter == NULL) 861 return (ENOMEM); 862 } 863 864 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 865 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 866 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 867 if (sc->vtnet_vlan_filter == NULL) 868 return (ENOMEM); 869 } 870 871 return (0); 872 } 873 874 static void 875 vtnet_free_rx_filters(struct vtnet_softc *sc) 876 { 877 878 if (sc->vtnet_mac_filter != NULL) { 879 free(sc->vtnet_mac_filter, M_DEVBUF); 880 sc->vtnet_mac_filter = NULL; 881 } 882 883 if (sc->vtnet_vlan_filter != NULL) { 884 free(sc->vtnet_vlan_filter, M_DEVBUF); 885 sc->vtnet_vlan_filter = NULL; 886 } 887 } 888 889 static int 890 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 891 { 892 device_t dev; 893 struct vq_alloc_info *info; 894 struct vtnet_rxq *rxq; 895 struct vtnet_txq *txq; 896 int i, idx, flags, nvqs, error; 897 898 dev = sc->vtnet_dev; 899 flags = 0; 900 901 nvqs = sc->vtnet_max_vq_pairs * 2; 902 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 903 nvqs++; 904 905 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 906 if (info == NULL) 907 return (ENOMEM); 908 909 for (i = 0, idx = 0; i < sc->vtnet_max_vq_pairs; i++, idx+=2) { 910 rxq = &sc->vtnet_rxqs[i]; 911 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 912 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 913 "%s-%d rx", device_get_nameunit(dev), rxq->vtnrx_id); 914 915 txq = &sc->vtnet_txqs[i]; 916 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 917 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 918 "%s-%d tx", device_get_nameunit(dev), txq->vtntx_id); 919 } 920 921 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 922 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 923 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 924 } 925 926 /* 927 * Enable interrupt binding if this is multiqueue. This only matters 928 * when per-vq MSIX is available. 929 */ 930 if (sc->vtnet_flags & VTNET_FLAG_MULTIQ) 931 flags |= 0; 932 933 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 934 free(info, M_TEMP); 935 936 return (error); 937 } 938 939 static int 940 vtnet_setup_interface(struct vtnet_softc *sc) 941 { 942 device_t dev; 943 struct pfil_head_args pa; 944 struct ifnet *ifp; 945 946 dev = sc->vtnet_dev; 947 948 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER); 949 if (ifp == NULL) { 950 device_printf(dev, "cannot allocate ifnet structure\n"); 951 return (ENOSPC); 952 } 953 954 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 955 ifp->if_baudrate = IF_Gbps(10); /* Approx. */ 956 ifp->if_softc = sc; 957 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST | 958 IFF_KNOWSEPOCH; 959 ifp->if_init = vtnet_init; 960 ifp->if_ioctl = vtnet_ioctl; 961 ifp->if_get_counter = vtnet_get_counter; 962 #ifndef VTNET_LEGACY_TX 963 ifp->if_transmit = vtnet_txq_mq_start; 964 ifp->if_qflush = vtnet_qflush; 965 #else 966 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 967 ifp->if_start = vtnet_start; 968 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1); 969 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1; 970 IFQ_SET_READY(&ifp->if_snd); 971 #endif 972 973 ifmedia_init(&sc->vtnet_media, IFM_IMASK, vtnet_ifmedia_upd, 974 vtnet_ifmedia_sts); 975 ifmedia_add(&sc->vtnet_media, VTNET_MEDIATYPE, 0, NULL); 976 ifmedia_set(&sc->vtnet_media, VTNET_MEDIATYPE); 977 978 /* Read (or generate) the MAC address for the adapter. */ 979 vtnet_get_hwaddr(sc); 980 981 ether_ifattach(ifp, sc->vtnet_hwaddr); 982 983 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 984 ifp->if_capabilities |= IFCAP_LINKSTATE; 985 986 /* Tell the upper layer(s) we support long frames. */ 987 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 988 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 989 990 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 991 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6; 992 993 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO)) { 994 ifp->if_capabilities |= IFCAP_TSO4 | IFCAP_TSO6; 995 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 996 } else { 997 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 998 ifp->if_capabilities |= IFCAP_TSO4; 999 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1000 ifp->if_capabilities |= IFCAP_TSO6; 1001 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1002 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1003 } 1004 1005 if (ifp->if_capabilities & IFCAP_TSO) 1006 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 1007 } 1008 1009 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1010 ifp->if_capabilities |= IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6; 1011 1012 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) || 1013 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6)) 1014 ifp->if_capabilities |= IFCAP_LRO; 1015 } 1016 1017 if (ifp->if_capabilities & IFCAP_HWCSUM) { 1018 /* 1019 * VirtIO does not support VLAN tagging, but we can fake 1020 * it by inserting and removing the 802.1Q header during 1021 * transmit and receive. We are then able to do checksum 1022 * offloading of VLAN frames. 1023 */ 1024 ifp->if_capabilities |= 1025 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 1026 } 1027 1028 ifp->if_capenable = ifp->if_capabilities; 1029 1030 /* 1031 * Capabilities after here are not enabled by default. 1032 */ 1033 1034 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1035 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 1036 1037 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1038 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1039 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1040 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1041 } 1042 1043 vtnet_set_rx_process_limit(sc); 1044 vtnet_set_tx_intr_threshold(sc); 1045 1046 DEBUGNET_SET(ifp, vtnet); 1047 1048 pa.pa_version = PFIL_VERSION; 1049 pa.pa_flags = PFIL_IN; 1050 pa.pa_type = PFIL_TYPE_ETHERNET; 1051 pa.pa_headname = ifp->if_xname; 1052 sc->vtnet_pfil = pfil_head_register(&pa); 1053 1054 return (0); 1055 } 1056 1057 static int 1058 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu) 1059 { 1060 struct ifnet *ifp; 1061 int frame_size, clsize; 1062 1063 ifp = sc->vtnet_ifp; 1064 1065 if (new_mtu < ETHERMIN || new_mtu > VTNET_MAX_MTU) 1066 return (EINVAL); 1067 1068 frame_size = sc->vtnet_hdr_size + sizeof(struct ether_vlan_header) + 1069 new_mtu; 1070 1071 /* 1072 * Based on the new MTU (and hence frame size) determine which 1073 * cluster size is most appropriate for the receive queues. 1074 */ 1075 if (frame_size <= MCLBYTES) { 1076 clsize = MCLBYTES; 1077 } else if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1078 /* Avoid going past 9K jumbos. */ 1079 if (frame_size > MJUM9BYTES) 1080 return (EINVAL); 1081 clsize = MJUM9BYTES; 1082 } else 1083 clsize = MJUMPAGESIZE; 1084 1085 ifp->if_mtu = new_mtu; 1086 sc->vtnet_rx_new_clsize = clsize; 1087 1088 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1089 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1090 vtnet_init_locked(sc); 1091 } 1092 1093 return (0); 1094 } 1095 1096 static int 1097 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1098 { 1099 struct vtnet_softc *sc; 1100 struct ifreq *ifr; 1101 int reinit, mask, error; 1102 1103 sc = ifp->if_softc; 1104 ifr = (struct ifreq *) data; 1105 error = 0; 1106 1107 switch (cmd) { 1108 case SIOCSIFMTU: 1109 if (ifp->if_mtu != ifr->ifr_mtu) { 1110 VTNET_CORE_LOCK(sc); 1111 error = vtnet_change_mtu(sc, ifr->ifr_mtu); 1112 VTNET_CORE_UNLOCK(sc); 1113 } 1114 break; 1115 1116 case SIOCSIFFLAGS: 1117 VTNET_CORE_LOCK(sc); 1118 if ((ifp->if_flags & IFF_UP) == 0) { 1119 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1120 vtnet_stop(sc); 1121 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1122 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 1123 (IFF_PROMISC | IFF_ALLMULTI)) { 1124 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1125 vtnet_rx_filter(sc); 1126 else { 1127 ifp->if_flags |= IFF_PROMISC; 1128 if ((ifp->if_flags ^ sc->vtnet_if_flags) 1129 & IFF_ALLMULTI) 1130 error = ENOTSUP; 1131 } 1132 } 1133 } else 1134 vtnet_init_locked(sc); 1135 1136 if (error == 0) 1137 sc->vtnet_if_flags = ifp->if_flags; 1138 VTNET_CORE_UNLOCK(sc); 1139 break; 1140 1141 case SIOCADDMULTI: 1142 case SIOCDELMULTI: 1143 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 1144 break; 1145 VTNET_CORE_LOCK(sc); 1146 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1147 vtnet_rx_filter_mac(sc); 1148 VTNET_CORE_UNLOCK(sc); 1149 break; 1150 1151 case SIOCSIFMEDIA: 1152 case SIOCGIFMEDIA: 1153 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1154 break; 1155 1156 case SIOCSIFCAP: 1157 VTNET_CORE_LOCK(sc); 1158 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 1159 1160 if (mask & IFCAP_TXCSUM) 1161 ifp->if_capenable ^= IFCAP_TXCSUM; 1162 if (mask & IFCAP_TXCSUM_IPV6) 1163 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1164 if (mask & IFCAP_TSO4) 1165 ifp->if_capenable ^= IFCAP_TSO4; 1166 if (mask & IFCAP_TSO6) 1167 ifp->if_capenable ^= IFCAP_TSO6; 1168 1169 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO | 1170 IFCAP_VLAN_HWFILTER)) { 1171 /* These Rx features require us to renegotiate. */ 1172 reinit = 1; 1173 1174 if (mask & IFCAP_RXCSUM) 1175 ifp->if_capenable ^= IFCAP_RXCSUM; 1176 if (mask & IFCAP_RXCSUM_IPV6) 1177 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1178 if (mask & IFCAP_LRO) 1179 ifp->if_capenable ^= IFCAP_LRO; 1180 if (mask & IFCAP_VLAN_HWFILTER) 1181 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1182 } else 1183 reinit = 0; 1184 1185 if (mask & IFCAP_VLAN_HWTSO) 1186 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1187 if (mask & IFCAP_VLAN_HWTAGGING) 1188 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1189 1190 if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 1191 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1192 vtnet_init_locked(sc); 1193 } 1194 1195 VTNET_CORE_UNLOCK(sc); 1196 VLAN_CAPABILITIES(ifp); 1197 1198 break; 1199 1200 default: 1201 error = ether_ioctl(ifp, cmd, data); 1202 break; 1203 } 1204 1205 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1206 1207 return (error); 1208 } 1209 1210 static int 1211 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1212 { 1213 struct virtqueue *vq; 1214 int nbufs, error; 1215 1216 #ifdef DEV_NETMAP 1217 error = vtnet_netmap_rxq_populate(rxq); 1218 if (error >= 0) 1219 return (error); 1220 #endif /* DEV_NETMAP */ 1221 1222 vq = rxq->vtnrx_vq; 1223 error = ENOSPC; 1224 1225 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1226 error = vtnet_rxq_new_buf(rxq); 1227 if (error) 1228 break; 1229 } 1230 1231 if (nbufs > 0) { 1232 virtqueue_notify(vq); 1233 /* 1234 * EMSGSIZE signifies the virtqueue did not have enough 1235 * entries available to hold the last mbuf. This is not 1236 * an error. 1237 */ 1238 if (error == EMSGSIZE) 1239 error = 0; 1240 } 1241 1242 return (error); 1243 } 1244 1245 static void 1246 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1247 { 1248 struct virtqueue *vq; 1249 struct mbuf *m; 1250 int last; 1251 #ifdef DEV_NETMAP 1252 int netmap_bufs = vtnet_netmap_queue_on(rxq->vtnrx_sc, NR_RX, 1253 rxq->vtnrx_id); 1254 #else /* !DEV_NETMAP */ 1255 int netmap_bufs = 0; 1256 #endif /* !DEV_NETMAP */ 1257 1258 vq = rxq->vtnrx_vq; 1259 last = 0; 1260 1261 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1262 if (!netmap_bufs) 1263 m_freem(m); 1264 } 1265 1266 KASSERT(virtqueue_empty(vq), 1267 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1268 } 1269 1270 static struct mbuf * 1271 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1272 { 1273 struct mbuf *m_head, *m_tail, *m; 1274 int i, clsize; 1275 1276 clsize = sc->vtnet_rx_clsize; 1277 1278 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1279 ("%s: chained mbuf %d request without LRO_NOMRG", __func__, nbufs)); 1280 1281 m_head = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, clsize); 1282 if (m_head == NULL) 1283 goto fail; 1284 1285 m_head->m_len = clsize; 1286 m_tail = m_head; 1287 1288 /* Allocate the rest of the chain. */ 1289 for (i = 1; i < nbufs; i++) { 1290 m = m_getjcl(M_NOWAIT, MT_DATA, 0, clsize); 1291 if (m == NULL) 1292 goto fail; 1293 1294 m->m_len = clsize; 1295 m_tail->m_next = m; 1296 m_tail = m; 1297 } 1298 1299 if (m_tailp != NULL) 1300 *m_tailp = m_tail; 1301 1302 return (m_head); 1303 1304 fail: 1305 sc->vtnet_stats.mbuf_alloc_failed++; 1306 m_freem(m_head); 1307 1308 return (NULL); 1309 } 1310 1311 /* 1312 * Slow path for when LRO without mergeable buffers is negotiated. 1313 */ 1314 static int 1315 vtnet_rxq_replace_lro_nomgr_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1316 int len0) 1317 { 1318 struct vtnet_softc *sc; 1319 struct mbuf *m, *m_prev; 1320 struct mbuf *m_new, *m_tail; 1321 int len, clsize, nreplace, error; 1322 1323 sc = rxq->vtnrx_sc; 1324 clsize = sc->vtnet_rx_clsize; 1325 1326 m_prev = NULL; 1327 m_tail = NULL; 1328 nreplace = 0; 1329 1330 m = m0; 1331 len = len0; 1332 1333 /* 1334 * Since these mbuf chains are so large, we avoid allocating an 1335 * entire replacement chain if possible. When the received frame 1336 * did not consume the entire chain, the unused mbufs are moved 1337 * to the replacement chain. 1338 */ 1339 while (len > 0) { 1340 /* 1341 * Something is seriously wrong if we received a frame 1342 * larger than the chain. Drop it. 1343 */ 1344 if (m == NULL) { 1345 sc->vtnet_stats.rx_frame_too_large++; 1346 return (EMSGSIZE); 1347 } 1348 1349 /* We always allocate the same cluster size. */ 1350 KASSERT(m->m_len == clsize, 1351 ("%s: mbuf size %d is not the cluster size %d", 1352 __func__, m->m_len, clsize)); 1353 1354 m->m_len = MIN(m->m_len, len); 1355 len -= m->m_len; 1356 1357 m_prev = m; 1358 m = m->m_next; 1359 nreplace++; 1360 } 1361 1362 KASSERT(nreplace <= sc->vtnet_rx_nmbufs, 1363 ("%s: too many replacement mbufs %d max %d", __func__, nreplace, 1364 sc->vtnet_rx_nmbufs)); 1365 1366 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1367 if (m_new == NULL) { 1368 m_prev->m_len = clsize; 1369 return (ENOBUFS); 1370 } 1371 1372 /* 1373 * Move any unused mbufs from the received chain onto the end 1374 * of the new chain. 1375 */ 1376 if (m_prev->m_next != NULL) { 1377 m_tail->m_next = m_prev->m_next; 1378 m_prev->m_next = NULL; 1379 } 1380 1381 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1382 if (error) { 1383 /* 1384 * BAD! We could not enqueue the replacement mbuf chain. We 1385 * must restore the m0 chain to the original state if it was 1386 * modified so we can subsequently discard it. 1387 * 1388 * NOTE: The replacement is suppose to be an identical copy 1389 * to the one just dequeued so this is an unexpected error. 1390 */ 1391 sc->vtnet_stats.rx_enq_replacement_failed++; 1392 1393 if (m_tail->m_next != NULL) { 1394 m_prev->m_next = m_tail->m_next; 1395 m_tail->m_next = NULL; 1396 } 1397 1398 m_prev->m_len = clsize; 1399 m_freem(m_new); 1400 } 1401 1402 return (error); 1403 } 1404 1405 static int 1406 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1407 { 1408 struct vtnet_softc *sc; 1409 struct mbuf *m_new; 1410 int error; 1411 1412 sc = rxq->vtnrx_sc; 1413 1414 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || m->m_next == NULL, 1415 ("%s: chained mbuf without LRO_NOMRG", __func__)); 1416 1417 if (m->m_next == NULL) { 1418 /* Fast-path for the common case of just one mbuf. */ 1419 if (m->m_len < len) 1420 return (EINVAL); 1421 1422 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1423 if (m_new == NULL) 1424 return (ENOBUFS); 1425 1426 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1427 if (error) { 1428 /* 1429 * The new mbuf is suppose to be an identical 1430 * copy of the one just dequeued so this is an 1431 * unexpected error. 1432 */ 1433 m_freem(m_new); 1434 sc->vtnet_stats.rx_enq_replacement_failed++; 1435 } else 1436 m->m_len = len; 1437 } else 1438 error = vtnet_rxq_replace_lro_nomgr_buf(rxq, m, len); 1439 1440 return (error); 1441 } 1442 1443 static int 1444 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1445 { 1446 struct vtnet_softc *sc; 1447 struct sglist *sg; 1448 struct vtnet_rx_header *rxhdr; 1449 uint8_t *mdata; 1450 int offset, error; 1451 1452 sc = rxq->vtnrx_sc; 1453 sg = rxq->vtnrx_sg; 1454 mdata = mtod(m, uint8_t *); 1455 1456 VTNET_RXQ_LOCK_ASSERT(rxq); 1457 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG || m->m_next == NULL, 1458 ("%s: chained mbuf without LRO_NOMRG", __func__)); 1459 KASSERT(m->m_len == sc->vtnet_rx_clsize, 1460 ("%s: unexpected cluster size %d/%d", __func__, m->m_len, 1461 sc->vtnet_rx_clsize)); 1462 1463 sglist_reset(sg); 1464 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1465 MPASS(sc->vtnet_hdr_size == sizeof(rxhdr->vrh_uhdr.hdr) || 1466 sc->vtnet_hdr_size == sizeof(rxhdr->vrh_uhdr.mhdr)); 1467 rxhdr = (struct vtnet_rx_header *) mdata; 1468 sglist_append(sg, &rxhdr->vrh_uhdr, sc->vtnet_hdr_size); 1469 offset = sizeof(struct vtnet_rx_header); 1470 } else 1471 offset = 0; 1472 1473 sglist_append(sg, mdata + offset, m->m_len - offset); 1474 if (m->m_next != NULL) { 1475 error = sglist_append_mbuf(sg, m->m_next); 1476 MPASS(error == 0); 1477 } 1478 1479 error = virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg); 1480 1481 return (error); 1482 } 1483 1484 static int 1485 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1486 { 1487 struct vtnet_softc *sc; 1488 struct mbuf *m; 1489 int error; 1490 1491 sc = rxq->vtnrx_sc; 1492 1493 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1494 if (m == NULL) 1495 return (ENOBUFS); 1496 1497 error = vtnet_rxq_enqueue_buf(rxq, m); 1498 if (error) 1499 m_freem(m); 1500 1501 return (error); 1502 } 1503 1504 /* 1505 * Use the checksum offset in the VirtIO header to set the 1506 * correct CSUM_* flags. 1507 */ 1508 static int 1509 vtnet_rxq_csum_by_offset(struct vtnet_rxq *rxq, struct mbuf *m, 1510 uint16_t eth_type, int ip_start, struct virtio_net_hdr *hdr) 1511 { 1512 struct vtnet_softc *sc; 1513 #if defined(INET) || defined(INET6) 1514 int offset = hdr->csum_start + hdr->csum_offset; 1515 #endif 1516 1517 sc = rxq->vtnrx_sc; 1518 1519 /* Only do a basic sanity check on the offset. */ 1520 switch (eth_type) { 1521 #if defined(INET) 1522 case ETHERTYPE_IP: 1523 if (__predict_false(offset < ip_start + sizeof(struct ip))) 1524 return (1); 1525 break; 1526 #endif 1527 #if defined(INET6) 1528 case ETHERTYPE_IPV6: 1529 if (__predict_false(offset < ip_start + sizeof(struct ip6_hdr))) 1530 return (1); 1531 break; 1532 #endif 1533 default: 1534 sc->vtnet_stats.rx_csum_bad_ethtype++; 1535 return (1); 1536 } 1537 1538 /* 1539 * Use the offset to determine the appropriate CSUM_* flags. This is 1540 * a bit dirty, but we can get by with it since the checksum offsets 1541 * happen to be different. We assume the host host does not do IPv4 1542 * header checksum offloading. 1543 */ 1544 switch (hdr->csum_offset) { 1545 case offsetof(struct udphdr, uh_sum): 1546 case offsetof(struct tcphdr, th_sum): 1547 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1548 m->m_pkthdr.csum_data = 0xFFFF; 1549 break; 1550 default: 1551 sc->vtnet_stats.rx_csum_bad_offset++; 1552 return (1); 1553 } 1554 1555 return (0); 1556 } 1557 1558 static int 1559 vtnet_rxq_csum_by_parse(struct vtnet_rxq *rxq, struct mbuf *m, 1560 uint16_t eth_type, int ip_start, struct virtio_net_hdr *hdr) 1561 { 1562 struct vtnet_softc *sc; 1563 int offset, proto; 1564 1565 sc = rxq->vtnrx_sc; 1566 1567 switch (eth_type) { 1568 #if defined(INET) 1569 case ETHERTYPE_IP: { 1570 struct ip *ip; 1571 if (__predict_false(m->m_len < ip_start + sizeof(struct ip))) 1572 return (1); 1573 ip = (struct ip *)(m->m_data + ip_start); 1574 proto = ip->ip_p; 1575 offset = ip_start + (ip->ip_hl << 2); 1576 break; 1577 } 1578 #endif 1579 #if defined(INET6) 1580 case ETHERTYPE_IPV6: 1581 if (__predict_false(m->m_len < ip_start + 1582 sizeof(struct ip6_hdr))) 1583 return (1); 1584 offset = ip6_lasthdr(m, ip_start, IPPROTO_IPV6, &proto); 1585 if (__predict_false(offset < 0)) 1586 return (1); 1587 break; 1588 #endif 1589 default: 1590 sc->vtnet_stats.rx_csum_bad_ethtype++; 1591 return (1); 1592 } 1593 1594 switch (proto) { 1595 case IPPROTO_TCP: 1596 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) 1597 return (1); 1598 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1599 m->m_pkthdr.csum_data = 0xFFFF; 1600 break; 1601 case IPPROTO_UDP: 1602 if (__predict_false(m->m_len < offset + sizeof(struct udphdr))) 1603 return (1); 1604 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1605 m->m_pkthdr.csum_data = 0xFFFF; 1606 break; 1607 default: 1608 /* 1609 * For the remaining protocols, FreeBSD does not support 1610 * checksum offloading, so the checksum will be recomputed. 1611 */ 1612 #if 0 1613 if_printf(sc->vtnet_ifp, "cksum offload of unsupported " 1614 "protocol eth_type=%#x proto=%d csum_start=%d " 1615 "csum_offset=%d\n", __func__, eth_type, proto, 1616 hdr->csum_start, hdr->csum_offset); 1617 #endif 1618 break; 1619 } 1620 1621 return (0); 1622 } 1623 1624 /* 1625 * Set the appropriate CSUM_* flags. Unfortunately, the information 1626 * provided is not directly useful to us. The VirtIO header gives the 1627 * offset of the checksum, which is all Linux needs, but this is not 1628 * how FreeBSD does things. We are forced to peek inside the packet 1629 * a bit. 1630 * 1631 * It would be nice if VirtIO gave us the L4 protocol or if FreeBSD 1632 * could accept the offsets and let the stack figure it out. 1633 */ 1634 static int 1635 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1636 struct virtio_net_hdr *hdr) 1637 { 1638 struct ether_header *eh; 1639 struct ether_vlan_header *evh; 1640 uint16_t eth_type; 1641 int offset, error; 1642 1643 eh = mtod(m, struct ether_header *); 1644 eth_type = ntohs(eh->ether_type); 1645 if (eth_type == ETHERTYPE_VLAN) { 1646 /* BMV: We should handle nested VLAN tags too. */ 1647 evh = mtod(m, struct ether_vlan_header *); 1648 eth_type = ntohs(evh->evl_proto); 1649 offset = sizeof(struct ether_vlan_header); 1650 } else 1651 offset = sizeof(struct ether_header); 1652 1653 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1654 error = vtnet_rxq_csum_by_offset(rxq, m, eth_type, offset, hdr); 1655 else 1656 error = vtnet_rxq_csum_by_parse(rxq, m, eth_type, offset, hdr); 1657 1658 return (error); 1659 } 1660 1661 static void 1662 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1663 { 1664 struct mbuf *m; 1665 1666 while (--nbufs > 0) { 1667 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1668 if (m == NULL) 1669 break; 1670 vtnet_rxq_discard_buf(rxq, m); 1671 } 1672 } 1673 1674 static void 1675 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1676 { 1677 int error; 1678 1679 /* 1680 * Requeue the discarded mbuf. This should always be successful 1681 * since it was just dequeued. 1682 */ 1683 error = vtnet_rxq_enqueue_buf(rxq, m); 1684 KASSERT(error == 0, 1685 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1686 } 1687 1688 static int 1689 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1690 { 1691 struct vtnet_softc *sc; 1692 struct virtqueue *vq; 1693 struct mbuf *m, *m_tail; 1694 int len; 1695 1696 sc = rxq->vtnrx_sc; 1697 vq = rxq->vtnrx_vq; 1698 m_tail = m_head; 1699 1700 while (--nbufs > 0) { 1701 m = virtqueue_dequeue(vq, &len); 1702 if (m == NULL) { 1703 rxq->vtnrx_stats.vrxs_ierrors++; 1704 goto fail; 1705 } 1706 1707 if (vtnet_rxq_new_buf(rxq) != 0) { 1708 rxq->vtnrx_stats.vrxs_iqdrops++; 1709 vtnet_rxq_discard_buf(rxq, m); 1710 if (nbufs > 1) 1711 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1712 goto fail; 1713 } 1714 1715 if (m->m_len < len) 1716 len = m->m_len; 1717 1718 m->m_len = len; 1719 m->m_flags &= ~M_PKTHDR; 1720 1721 m_head->m_pkthdr.len += len; 1722 m_tail->m_next = m; 1723 m_tail = m; 1724 } 1725 1726 return (0); 1727 1728 fail: 1729 sc->vtnet_stats.rx_mergeable_failed++; 1730 m_freem(m_head); 1731 1732 return (1); 1733 } 1734 1735 static void 1736 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1737 struct virtio_net_hdr *hdr) 1738 { 1739 struct vtnet_softc *sc; 1740 struct ifnet *ifp; 1741 struct ether_header *eh; 1742 1743 sc = rxq->vtnrx_sc; 1744 ifp = sc->vtnet_ifp; 1745 1746 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1747 eh = mtod(m, struct ether_header *); 1748 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1749 vtnet_vlan_tag_remove(m); 1750 /* 1751 * With the 802.1Q header removed, update the 1752 * checksum starting location accordingly. 1753 */ 1754 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1755 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 1756 } 1757 } 1758 1759 m->m_pkthdr.flowid = rxq->vtnrx_id; 1760 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 1761 1762 /* 1763 * BMV: FreeBSD does not have the UNNECESSARY and PARTIAL checksum 1764 * distinction that Linux does. Need to reevaluate if performing 1765 * offloading for the NEEDS_CSUM case is really appropriate. 1766 */ 1767 if (hdr->flags & (VIRTIO_NET_HDR_F_NEEDS_CSUM | 1768 VIRTIO_NET_HDR_F_DATA_VALID)) { 1769 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 1770 rxq->vtnrx_stats.vrxs_csum++; 1771 else 1772 rxq->vtnrx_stats.vrxs_csum_failed++; 1773 } 1774 1775 rxq->vtnrx_stats.vrxs_ipackets++; 1776 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 1777 1778 VTNET_RXQ_UNLOCK(rxq); 1779 (*ifp->if_input)(ifp, m); 1780 VTNET_RXQ_LOCK(rxq); 1781 } 1782 1783 static int 1784 vtnet_rxq_eof(struct vtnet_rxq *rxq) 1785 { 1786 struct virtio_net_hdr lhdr, *hdr; 1787 struct vtnet_softc *sc; 1788 struct ifnet *ifp; 1789 struct virtqueue *vq; 1790 struct mbuf *m, *mr; 1791 struct virtio_net_hdr_mrg_rxbuf *mhdr; 1792 int len, deq, nbufs, adjsz, count; 1793 pfil_return_t pfil; 1794 bool pfil_done; 1795 1796 sc = rxq->vtnrx_sc; 1797 vq = rxq->vtnrx_vq; 1798 ifp = sc->vtnet_ifp; 1799 hdr = &lhdr; 1800 deq = 0; 1801 count = sc->vtnet_rx_process_limit; 1802 1803 VTNET_RXQ_LOCK_ASSERT(rxq); 1804 1805 while (count-- > 0) { 1806 m = virtqueue_dequeue(vq, &len); 1807 if (m == NULL) 1808 break; 1809 deq++; 1810 1811 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 1812 rxq->vtnrx_stats.vrxs_ierrors++; 1813 vtnet_rxq_discard_buf(rxq, m); 1814 continue; 1815 } 1816 1817 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1818 nbufs = 1; 1819 adjsz = sizeof(struct vtnet_rx_header); 1820 /* 1821 * Account for our pad inserted between the header 1822 * and the actual start of the frame. 1823 */ 1824 len += VTNET_RX_HEADER_PAD; 1825 } else { 1826 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 1827 nbufs = mhdr->num_buffers; 1828 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1829 } 1830 1831 /* 1832 * If we have enough data in first mbuf, run it through 1833 * pfil as a memory buffer before dequeueing the rest. 1834 */ 1835 if (PFIL_HOOKED_IN(sc->vtnet_pfil) && 1836 len - adjsz >= ETHER_HDR_LEN + max_protohdr) { 1837 pfil = pfil_run_hooks(sc->vtnet_pfil, 1838 m->m_data + adjsz, ifp, 1839 (len - adjsz) | PFIL_MEMPTR | PFIL_IN, NULL); 1840 switch (pfil) { 1841 case PFIL_REALLOCED: 1842 mr = pfil_mem2mbuf(m->m_data + adjsz); 1843 vtnet_rxq_input(rxq, mr, hdr); 1844 /* FALLTHROUGH */ 1845 case PFIL_DROPPED: 1846 case PFIL_CONSUMED: 1847 vtnet_rxq_discard_buf(rxq, m); 1848 if (nbufs > 1) 1849 vtnet_rxq_discard_merged_bufs(rxq, 1850 nbufs); 1851 continue; 1852 default: 1853 KASSERT(pfil == PFIL_PASS, 1854 ("Filter returned %d!\n", pfil)); 1855 }; 1856 pfil_done = true; 1857 } else 1858 pfil_done = false; 1859 1860 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 1861 rxq->vtnrx_stats.vrxs_iqdrops++; 1862 vtnet_rxq_discard_buf(rxq, m); 1863 if (nbufs > 1) 1864 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1865 continue; 1866 } 1867 1868 m->m_pkthdr.len = len; 1869 m->m_pkthdr.rcvif = ifp; 1870 m->m_pkthdr.csum_flags = 0; 1871 1872 if (nbufs > 1) { 1873 /* Dequeue the rest of chain. */ 1874 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 1875 continue; 1876 } 1877 1878 /* 1879 * Save copy of header before we strip it. For both mergeable 1880 * and non-mergeable, the header is at the beginning of the 1881 * mbuf data. We no longer need num_buffers, so always use a 1882 * regular header. 1883 * 1884 * BMV: Is this memcpy() expensive? We know the mbuf data is 1885 * still valid even after the m_adj(). 1886 */ 1887 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr)); 1888 m_adj(m, adjsz); 1889 1890 if (PFIL_HOOKED_IN(sc->vtnet_pfil) && pfil_done == false) { 1891 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 1892 NULL); 1893 switch (pfil) { 1894 case PFIL_DROPPED: 1895 case PFIL_CONSUMED: 1896 continue; 1897 default: 1898 KASSERT(pfil == PFIL_PASS, 1899 ("Filter returned %d!\n", pfil)); 1900 } 1901 } 1902 1903 vtnet_rxq_input(rxq, m, hdr); 1904 1905 /* Must recheck after dropping the Rx lock. */ 1906 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1907 break; 1908 } 1909 1910 if (deq > 0) 1911 virtqueue_notify(vq); 1912 1913 return (count > 0 ? 0 : EAGAIN); 1914 } 1915 1916 static void 1917 vtnet_rx_vq_intr(void *xrxq) 1918 { 1919 struct vtnet_softc *sc; 1920 struct vtnet_rxq *rxq; 1921 struct ifnet *ifp; 1922 int tries, more; 1923 #ifdef DEV_NETMAP 1924 int nmirq; 1925 #endif /* DEV_NETMAP */ 1926 1927 rxq = xrxq; 1928 sc = rxq->vtnrx_sc; 1929 ifp = sc->vtnet_ifp; 1930 tries = 0; 1931 1932 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 1933 /* 1934 * Ignore this interrupt. Either this is a spurious interrupt 1935 * or multiqueue without per-VQ MSIX so every queue needs to 1936 * be polled (a brain dead configuration we could try harder 1937 * to avoid). 1938 */ 1939 vtnet_rxq_disable_intr(rxq); 1940 return; 1941 } 1942 1943 VTNET_RXQ_LOCK(rxq); 1944 1945 #ifdef DEV_NETMAP 1946 /* 1947 * We call netmap_rx_irq() under lock to prevent concurrent calls. 1948 * This is not necessary to serialize the access to the RX vq, but 1949 * rather to avoid races that may happen if this interface is 1950 * attached to a VALE switch, which would cause received packets 1951 * to stall in the RX queue (nm_kr_tryget() could find the kring 1952 * busy when called from netmap_bwrap_intr_notify()). 1953 */ 1954 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 1955 if (nmirq != NM_IRQ_PASS) { 1956 VTNET_RXQ_UNLOCK(rxq); 1957 if (nmirq == NM_IRQ_RESCHED) { 1958 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1959 } 1960 return; 1961 } 1962 #endif /* DEV_NETMAP */ 1963 1964 again: 1965 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1966 VTNET_RXQ_UNLOCK(rxq); 1967 return; 1968 } 1969 1970 more = vtnet_rxq_eof(rxq); 1971 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 1972 if (!more) 1973 vtnet_rxq_disable_intr(rxq); 1974 /* 1975 * This is an occasional condition or race (when !more), 1976 * so retry a few times before scheduling the taskqueue. 1977 */ 1978 if (tries++ < VTNET_INTR_DISABLE_RETRIES) 1979 goto again; 1980 1981 VTNET_RXQ_UNLOCK(rxq); 1982 rxq->vtnrx_stats.vrxs_rescheduled++; 1983 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1984 } else 1985 VTNET_RXQ_UNLOCK(rxq); 1986 } 1987 1988 static void 1989 vtnet_rxq_tq_intr(void *xrxq, int pending) 1990 { 1991 struct vtnet_softc *sc; 1992 struct vtnet_rxq *rxq; 1993 struct ifnet *ifp; 1994 int more; 1995 #ifdef DEV_NETMAP 1996 int nmirq; 1997 #endif /* DEV_NETMAP */ 1998 1999 rxq = xrxq; 2000 sc = rxq->vtnrx_sc; 2001 ifp = sc->vtnet_ifp; 2002 2003 VTNET_RXQ_LOCK(rxq); 2004 2005 #ifdef DEV_NETMAP 2006 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2007 if (nmirq != NM_IRQ_PASS) { 2008 VTNET_RXQ_UNLOCK(rxq); 2009 if (nmirq == NM_IRQ_RESCHED) { 2010 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2011 } 2012 return; 2013 } 2014 #endif /* DEV_NETMAP */ 2015 2016 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2017 VTNET_RXQ_UNLOCK(rxq); 2018 return; 2019 } 2020 2021 more = vtnet_rxq_eof(rxq); 2022 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2023 if (!more) 2024 vtnet_rxq_disable_intr(rxq); 2025 rxq->vtnrx_stats.vrxs_rescheduled++; 2026 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2027 } 2028 2029 VTNET_RXQ_UNLOCK(rxq); 2030 } 2031 2032 static int 2033 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2034 { 2035 struct vtnet_softc *sc; 2036 struct virtqueue *vq; 2037 2038 sc = txq->vtntx_sc; 2039 vq = txq->vtntx_vq; 2040 2041 return (virtqueue_nfree(vq) <= sc->vtnet_tx_intr_thresh); 2042 } 2043 2044 static int 2045 vtnet_txq_notify(struct vtnet_txq *txq) 2046 { 2047 struct virtqueue *vq; 2048 2049 vq = txq->vtntx_vq; 2050 2051 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2052 virtqueue_notify(vq); 2053 2054 if (vtnet_txq_enable_intr(txq) == 0) 2055 return (0); 2056 2057 /* 2058 * Drain frames that were completed since last checked. If this 2059 * causes the queue to go above the threshold, the caller should 2060 * continue transmitting. 2061 */ 2062 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2063 virtqueue_disable_intr(vq); 2064 return (1); 2065 } 2066 2067 return (0); 2068 } 2069 2070 static void 2071 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2072 { 2073 struct virtqueue *vq; 2074 struct vtnet_tx_header *txhdr; 2075 int last; 2076 #ifdef DEV_NETMAP 2077 int netmap_bufs = vtnet_netmap_queue_on(txq->vtntx_sc, NR_TX, 2078 txq->vtntx_id); 2079 #else /* !DEV_NETMAP */ 2080 int netmap_bufs = 0; 2081 #endif /* !DEV_NETMAP */ 2082 2083 vq = txq->vtntx_vq; 2084 last = 0; 2085 2086 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2087 if (!netmap_bufs) { 2088 m_freem(txhdr->vth_mbuf); 2089 uma_zfree(vtnet_tx_header_zone, txhdr); 2090 } 2091 } 2092 2093 KASSERT(virtqueue_empty(vq), 2094 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2095 } 2096 2097 /* 2098 * BMV: Much of this can go away once we finally have offsets in 2099 * the mbuf packet header. Bug andre@. 2100 */ 2101 static int 2102 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, 2103 int *etype, int *proto, int *start) 2104 { 2105 struct vtnet_softc *sc; 2106 struct ether_vlan_header *evh; 2107 int offset; 2108 2109 sc = txq->vtntx_sc; 2110 2111 evh = mtod(m, struct ether_vlan_header *); 2112 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2113 /* BMV: We should handle nested VLAN tags too. */ 2114 *etype = ntohs(evh->evl_proto); 2115 offset = sizeof(struct ether_vlan_header); 2116 } else { 2117 *etype = ntohs(evh->evl_encap_proto); 2118 offset = sizeof(struct ether_header); 2119 } 2120 2121 switch (*etype) { 2122 #if defined(INET) 2123 case ETHERTYPE_IP: { 2124 struct ip *ip, iphdr; 2125 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2126 m_copydata(m, offset, sizeof(struct ip), 2127 (caddr_t) &iphdr); 2128 ip = &iphdr; 2129 } else 2130 ip = (struct ip *)(m->m_data + offset); 2131 *proto = ip->ip_p; 2132 *start = offset + (ip->ip_hl << 2); 2133 break; 2134 } 2135 #endif 2136 #if defined(INET6) 2137 case ETHERTYPE_IPV6: 2138 *proto = -1; 2139 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2140 /* Assert the network stack sent us a valid packet. */ 2141 KASSERT(*start > offset, 2142 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2143 *start, offset, *proto)); 2144 break; 2145 #endif 2146 default: 2147 sc->vtnet_stats.tx_csum_bad_ethtype++; 2148 return (EINVAL); 2149 } 2150 2151 return (0); 2152 } 2153 2154 static int 2155 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2156 int offset, struct virtio_net_hdr *hdr) 2157 { 2158 static struct timeval lastecn; 2159 static int curecn; 2160 struct vtnet_softc *sc; 2161 struct tcphdr *tcp, tcphdr; 2162 2163 sc = txq->vtntx_sc; 2164 2165 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2166 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2167 tcp = &tcphdr; 2168 } else 2169 tcp = (struct tcphdr *)(m->m_data + offset); 2170 2171 hdr->hdr_len = offset + (tcp->th_off << 2); 2172 hdr->gso_size = m->m_pkthdr.tso_segsz; 2173 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2174 VIRTIO_NET_HDR_GSO_TCPV6; 2175 2176 if (tcp->th_flags & TH_CWR) { 2177 /* 2178 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD, 2179 * ECN support is not on a per-interface basis, but globally via 2180 * the net.inet.tcp.ecn.enable sysctl knob. The default is off. 2181 */ 2182 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2183 if (ppsratecheck(&lastecn, &curecn, 1)) 2184 if_printf(sc->vtnet_ifp, 2185 "TSO with ECN not negotiated with host\n"); 2186 return (ENOTSUP); 2187 } 2188 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2189 } 2190 2191 txq->vtntx_stats.vtxs_tso++; 2192 2193 return (0); 2194 } 2195 2196 static struct mbuf * 2197 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2198 struct virtio_net_hdr *hdr) 2199 { 2200 struct vtnet_softc *sc; 2201 int flags, etype, csum_start, proto, error; 2202 2203 sc = txq->vtntx_sc; 2204 flags = m->m_pkthdr.csum_flags; 2205 2206 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2207 if (error) 2208 goto drop; 2209 2210 if ((etype == ETHERTYPE_IP && flags & VTNET_CSUM_OFFLOAD) || 2211 (etype == ETHERTYPE_IPV6 && flags & VTNET_CSUM_OFFLOAD_IPV6)) { 2212 /* 2213 * We could compare the IP protocol vs the CSUM_ flag too, 2214 * but that really should not be necessary. 2215 */ 2216 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2217 hdr->csum_start = csum_start; 2218 hdr->csum_offset = m->m_pkthdr.csum_data; 2219 txq->vtntx_stats.vtxs_csum++; 2220 } 2221 2222 if (flags & CSUM_TSO) { 2223 if (__predict_false(proto != IPPROTO_TCP)) { 2224 /* Likely failed to correctly parse the mbuf. */ 2225 sc->vtnet_stats.tx_tso_not_tcp++; 2226 goto drop; 2227 } 2228 2229 KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM, 2230 ("%s: mbuf %p TSO without checksum offload %#x", 2231 __func__, m, flags)); 2232 2233 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2234 if (error) 2235 goto drop; 2236 } 2237 2238 return (m); 2239 2240 drop: 2241 m_freem(m); 2242 return (NULL); 2243 } 2244 2245 static int 2246 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2247 struct vtnet_tx_header *txhdr) 2248 { 2249 struct vtnet_softc *sc; 2250 struct virtqueue *vq; 2251 struct sglist *sg; 2252 struct mbuf *m; 2253 int error; 2254 2255 sc = txq->vtntx_sc; 2256 vq = txq->vtntx_vq; 2257 sg = txq->vtntx_sg; 2258 m = *m_head; 2259 2260 sglist_reset(sg); 2261 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2262 KASSERT(error == 0 && sg->sg_nseg == 1, 2263 ("%s: error %d adding header to sglist", __func__, error)); 2264 2265 error = sglist_append_mbuf(sg, m); 2266 if (error) { 2267 m = m_defrag(m, M_NOWAIT); 2268 if (m == NULL) 2269 goto fail; 2270 2271 *m_head = m; 2272 sc->vtnet_stats.tx_defragged++; 2273 2274 error = sglist_append_mbuf(sg, m); 2275 if (error) 2276 goto fail; 2277 } 2278 2279 txhdr->vth_mbuf = m; 2280 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2281 2282 return (error); 2283 2284 fail: 2285 sc->vtnet_stats.tx_defrag_failed++; 2286 m_freem(*m_head); 2287 *m_head = NULL; 2288 2289 return (ENOBUFS); 2290 } 2291 2292 static int 2293 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2294 { 2295 struct vtnet_tx_header *txhdr; 2296 struct virtio_net_hdr *hdr; 2297 struct mbuf *m; 2298 int error; 2299 2300 m = *m_head; 2301 M_ASSERTPKTHDR(m); 2302 2303 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2304 if (txhdr == NULL) { 2305 m_freem(m); 2306 *m_head = NULL; 2307 return (ENOMEM); 2308 } 2309 2310 /* 2311 * Always use the non-mergeable header, regardless if the feature 2312 * was negotiated. For transmit, num_buffers is always zero. The 2313 * vtnet_hdr_size is used to enqueue the correct header size. 2314 */ 2315 hdr = &txhdr->vth_uhdr.hdr; 2316 2317 if (m->m_flags & M_VLANTAG) { 2318 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2319 if ((*m_head = m) == NULL) { 2320 error = ENOBUFS; 2321 goto fail; 2322 } 2323 m->m_flags &= ~M_VLANTAG; 2324 } 2325 2326 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2327 m = vtnet_txq_offload(txq, m, hdr); 2328 if ((*m_head = m) == NULL) { 2329 error = ENOBUFS; 2330 goto fail; 2331 } 2332 } 2333 2334 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2335 if (error == 0) 2336 return (0); 2337 2338 fail: 2339 uma_zfree(vtnet_tx_header_zone, txhdr); 2340 2341 return (error); 2342 } 2343 2344 #ifdef VTNET_LEGACY_TX 2345 2346 static void 2347 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2348 { 2349 struct vtnet_softc *sc; 2350 struct virtqueue *vq; 2351 struct mbuf *m0; 2352 int tries, enq; 2353 2354 sc = txq->vtntx_sc; 2355 vq = txq->vtntx_vq; 2356 tries = 0; 2357 2358 VTNET_TXQ_LOCK_ASSERT(txq); 2359 2360 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2361 sc->vtnet_link_active == 0) 2362 return; 2363 2364 vtnet_txq_eof(txq); 2365 2366 again: 2367 enq = 0; 2368 2369 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2370 if (virtqueue_full(vq)) 2371 break; 2372 2373 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2374 if (m0 == NULL) 2375 break; 2376 2377 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2378 if (m0 != NULL) 2379 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2380 break; 2381 } 2382 2383 enq++; 2384 ETHER_BPF_MTAP(ifp, m0); 2385 } 2386 2387 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2388 if (tries++ < VTNET_NOTIFY_RETRIES) 2389 goto again; 2390 2391 txq->vtntx_stats.vtxs_rescheduled++; 2392 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2393 } 2394 } 2395 2396 static void 2397 vtnet_start(struct ifnet *ifp) 2398 { 2399 struct vtnet_softc *sc; 2400 struct vtnet_txq *txq; 2401 2402 sc = ifp->if_softc; 2403 txq = &sc->vtnet_txqs[0]; 2404 2405 VTNET_TXQ_LOCK(txq); 2406 vtnet_start_locked(txq, ifp); 2407 VTNET_TXQ_UNLOCK(txq); 2408 } 2409 2410 #else /* !VTNET_LEGACY_TX */ 2411 2412 static int 2413 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2414 { 2415 struct vtnet_softc *sc; 2416 struct virtqueue *vq; 2417 struct buf_ring *br; 2418 struct ifnet *ifp; 2419 int enq, tries, error; 2420 2421 sc = txq->vtntx_sc; 2422 vq = txq->vtntx_vq; 2423 br = txq->vtntx_br; 2424 ifp = sc->vtnet_ifp; 2425 tries = 0; 2426 error = 0; 2427 2428 VTNET_TXQ_LOCK_ASSERT(txq); 2429 2430 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2431 sc->vtnet_link_active == 0) { 2432 if (m != NULL) 2433 error = drbr_enqueue(ifp, br, m); 2434 return (error); 2435 } 2436 2437 if (m != NULL) { 2438 error = drbr_enqueue(ifp, br, m); 2439 if (error) 2440 return (error); 2441 } 2442 2443 vtnet_txq_eof(txq); 2444 2445 again: 2446 enq = 0; 2447 2448 while ((m = drbr_peek(ifp, br)) != NULL) { 2449 if (virtqueue_full(vq)) { 2450 drbr_putback(ifp, br, m); 2451 break; 2452 } 2453 2454 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2455 if (m != NULL) 2456 drbr_putback(ifp, br, m); 2457 else 2458 drbr_advance(ifp, br); 2459 break; 2460 } 2461 drbr_advance(ifp, br); 2462 2463 enq++; 2464 ETHER_BPF_MTAP(ifp, m); 2465 } 2466 2467 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2468 if (tries++ < VTNET_NOTIFY_RETRIES) 2469 goto again; 2470 2471 txq->vtntx_stats.vtxs_rescheduled++; 2472 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2473 } 2474 2475 return (0); 2476 } 2477 2478 static int 2479 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2480 { 2481 struct vtnet_softc *sc; 2482 struct vtnet_txq *txq; 2483 int i, npairs, error; 2484 2485 sc = ifp->if_softc; 2486 npairs = sc->vtnet_act_vq_pairs; 2487 2488 /* check if flowid is set */ 2489 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2490 i = m->m_pkthdr.flowid % npairs; 2491 else 2492 i = curcpu % npairs; 2493 2494 txq = &sc->vtnet_txqs[i]; 2495 2496 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2497 error = vtnet_txq_mq_start_locked(txq, m); 2498 VTNET_TXQ_UNLOCK(txq); 2499 } else { 2500 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2501 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2502 } 2503 2504 return (error); 2505 } 2506 2507 static void 2508 vtnet_txq_tq_deferred(void *xtxq, int pending) 2509 { 2510 struct vtnet_softc *sc; 2511 struct vtnet_txq *txq; 2512 2513 txq = xtxq; 2514 sc = txq->vtntx_sc; 2515 2516 VTNET_TXQ_LOCK(txq); 2517 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2518 vtnet_txq_mq_start_locked(txq, NULL); 2519 VTNET_TXQ_UNLOCK(txq); 2520 } 2521 2522 #endif /* VTNET_LEGACY_TX */ 2523 2524 static void 2525 vtnet_txq_start(struct vtnet_txq *txq) 2526 { 2527 struct vtnet_softc *sc; 2528 struct ifnet *ifp; 2529 2530 sc = txq->vtntx_sc; 2531 ifp = sc->vtnet_ifp; 2532 2533 #ifdef VTNET_LEGACY_TX 2534 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2535 vtnet_start_locked(txq, ifp); 2536 #else 2537 if (!drbr_empty(ifp, txq->vtntx_br)) 2538 vtnet_txq_mq_start_locked(txq, NULL); 2539 #endif 2540 } 2541 2542 static void 2543 vtnet_txq_tq_intr(void *xtxq, int pending) 2544 { 2545 struct vtnet_softc *sc; 2546 struct vtnet_txq *txq; 2547 struct ifnet *ifp; 2548 2549 txq = xtxq; 2550 sc = txq->vtntx_sc; 2551 ifp = sc->vtnet_ifp; 2552 2553 VTNET_TXQ_LOCK(txq); 2554 2555 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2556 VTNET_TXQ_UNLOCK(txq); 2557 return; 2558 } 2559 2560 vtnet_txq_eof(txq); 2561 vtnet_txq_start(txq); 2562 2563 VTNET_TXQ_UNLOCK(txq); 2564 } 2565 2566 static int 2567 vtnet_txq_eof(struct vtnet_txq *txq) 2568 { 2569 struct virtqueue *vq; 2570 struct vtnet_tx_header *txhdr; 2571 struct mbuf *m; 2572 int deq; 2573 2574 vq = txq->vtntx_vq; 2575 deq = 0; 2576 VTNET_TXQ_LOCK_ASSERT(txq); 2577 2578 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2579 m = txhdr->vth_mbuf; 2580 deq++; 2581 2582 txq->vtntx_stats.vtxs_opackets++; 2583 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2584 if (m->m_flags & M_MCAST) 2585 txq->vtntx_stats.vtxs_omcasts++; 2586 2587 m_freem(m); 2588 uma_zfree(vtnet_tx_header_zone, txhdr); 2589 } 2590 2591 if (virtqueue_empty(vq)) 2592 txq->vtntx_watchdog = 0; 2593 2594 return (deq); 2595 } 2596 2597 static void 2598 vtnet_tx_vq_intr(void *xtxq) 2599 { 2600 struct vtnet_softc *sc; 2601 struct vtnet_txq *txq; 2602 struct ifnet *ifp; 2603 2604 txq = xtxq; 2605 sc = txq->vtntx_sc; 2606 ifp = sc->vtnet_ifp; 2607 2608 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2609 /* 2610 * Ignore this interrupt. Either this is a spurious interrupt 2611 * or multiqueue without per-VQ MSIX so every queue needs to 2612 * be polled (a brain dead configuration we could try harder 2613 * to avoid). 2614 */ 2615 vtnet_txq_disable_intr(txq); 2616 return; 2617 } 2618 2619 #ifdef DEV_NETMAP 2620 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2621 return; 2622 #endif /* DEV_NETMAP */ 2623 2624 VTNET_TXQ_LOCK(txq); 2625 2626 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2627 VTNET_TXQ_UNLOCK(txq); 2628 return; 2629 } 2630 2631 vtnet_txq_eof(txq); 2632 vtnet_txq_start(txq); 2633 2634 VTNET_TXQ_UNLOCK(txq); 2635 } 2636 2637 static void 2638 vtnet_tx_start_all(struct vtnet_softc *sc) 2639 { 2640 struct vtnet_txq *txq; 2641 int i; 2642 2643 VTNET_CORE_LOCK_ASSERT(sc); 2644 2645 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2646 txq = &sc->vtnet_txqs[i]; 2647 2648 VTNET_TXQ_LOCK(txq); 2649 vtnet_txq_start(txq); 2650 VTNET_TXQ_UNLOCK(txq); 2651 } 2652 } 2653 2654 #ifndef VTNET_LEGACY_TX 2655 static void 2656 vtnet_qflush(struct ifnet *ifp) 2657 { 2658 struct vtnet_softc *sc; 2659 struct vtnet_txq *txq; 2660 struct mbuf *m; 2661 int i; 2662 2663 sc = ifp->if_softc; 2664 2665 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2666 txq = &sc->vtnet_txqs[i]; 2667 2668 VTNET_TXQ_LOCK(txq); 2669 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2670 m_freem(m); 2671 VTNET_TXQ_UNLOCK(txq); 2672 } 2673 2674 if_qflush(ifp); 2675 } 2676 #endif 2677 2678 static int 2679 vtnet_watchdog(struct vtnet_txq *txq) 2680 { 2681 struct ifnet *ifp; 2682 2683 ifp = txq->vtntx_sc->vtnet_ifp; 2684 2685 VTNET_TXQ_LOCK(txq); 2686 if (txq->vtntx_watchdog == 1) { 2687 /* 2688 * Only drain completed frames if the watchdog is about to 2689 * expire. If any frames were drained, there may be enough 2690 * free descriptors now available to transmit queued frames. 2691 * In that case, the timer will immediately be decremented 2692 * below, but the timeout is generous enough that should not 2693 * be a problem. 2694 */ 2695 if (vtnet_txq_eof(txq) != 0) 2696 vtnet_txq_start(txq); 2697 } 2698 2699 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2700 VTNET_TXQ_UNLOCK(txq); 2701 return (0); 2702 } 2703 VTNET_TXQ_UNLOCK(txq); 2704 2705 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2706 return (1); 2707 } 2708 2709 static void 2710 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2711 struct vtnet_txq_stats *txacc) 2712 { 2713 2714 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2715 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2716 2717 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2718 struct vtnet_rxq_stats *rxst; 2719 struct vtnet_txq_stats *txst; 2720 2721 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2722 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2723 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2724 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2725 rxacc->vrxs_csum += rxst->vrxs_csum; 2726 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2727 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2728 2729 txst = &sc->vtnet_txqs[i].vtntx_stats; 2730 txacc->vtxs_opackets += txst->vtxs_opackets; 2731 txacc->vtxs_obytes += txst->vtxs_obytes; 2732 txacc->vtxs_csum += txst->vtxs_csum; 2733 txacc->vtxs_tso += txst->vtxs_tso; 2734 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2735 } 2736 } 2737 2738 static uint64_t 2739 vtnet_get_counter(if_t ifp, ift_counter cnt) 2740 { 2741 struct vtnet_softc *sc; 2742 struct vtnet_rxq_stats rxaccum; 2743 struct vtnet_txq_stats txaccum; 2744 2745 sc = if_getsoftc(ifp); 2746 vtnet_accum_stats(sc, &rxaccum, &txaccum); 2747 2748 switch (cnt) { 2749 case IFCOUNTER_IPACKETS: 2750 return (rxaccum.vrxs_ipackets); 2751 case IFCOUNTER_IQDROPS: 2752 return (rxaccum.vrxs_iqdrops); 2753 case IFCOUNTER_IERRORS: 2754 return (rxaccum.vrxs_ierrors); 2755 case IFCOUNTER_OPACKETS: 2756 return (txaccum.vtxs_opackets); 2757 #ifndef VTNET_LEGACY_TX 2758 case IFCOUNTER_OBYTES: 2759 return (txaccum.vtxs_obytes); 2760 case IFCOUNTER_OMCASTS: 2761 return (txaccum.vtxs_omcasts); 2762 #endif 2763 default: 2764 return (if_get_counter_default(ifp, cnt)); 2765 } 2766 } 2767 2768 static void 2769 vtnet_tick(void *xsc) 2770 { 2771 struct vtnet_softc *sc; 2772 struct ifnet *ifp; 2773 int i, timedout; 2774 2775 sc = xsc; 2776 ifp = sc->vtnet_ifp; 2777 timedout = 0; 2778 2779 VTNET_CORE_LOCK_ASSERT(sc); 2780 2781 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 2782 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 2783 2784 if (timedout != 0) { 2785 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2786 vtnet_init_locked(sc); 2787 } else 2788 callout_schedule(&sc->vtnet_tick_ch, hz); 2789 } 2790 2791 static void 2792 vtnet_start_taskqueues(struct vtnet_softc *sc) 2793 { 2794 device_t dev; 2795 struct vtnet_rxq *rxq; 2796 struct vtnet_txq *txq; 2797 int i, error; 2798 2799 dev = sc->vtnet_dev; 2800 2801 /* 2802 * Errors here are very difficult to recover from - we cannot 2803 * easily fail because, if this is during boot, we will hang 2804 * when freeing any successfully started taskqueues because 2805 * the scheduler isn't up yet. 2806 * 2807 * Most drivers just ignore the return value - it only fails 2808 * with ENOMEM so an error is not likely. 2809 */ 2810 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2811 rxq = &sc->vtnet_rxqs[i]; 2812 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 2813 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 2814 if (error) { 2815 device_printf(dev, "failed to start rx taskq %d\n", 2816 rxq->vtnrx_id); 2817 } 2818 2819 txq = &sc->vtnet_txqs[i]; 2820 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 2821 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 2822 if (error) { 2823 device_printf(dev, "failed to start tx taskq %d\n", 2824 txq->vtntx_id); 2825 } 2826 } 2827 } 2828 2829 static void 2830 vtnet_free_taskqueues(struct vtnet_softc *sc) 2831 { 2832 struct vtnet_rxq *rxq; 2833 struct vtnet_txq *txq; 2834 int i; 2835 2836 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2837 rxq = &sc->vtnet_rxqs[i]; 2838 if (rxq->vtnrx_tq != NULL) { 2839 taskqueue_free(rxq->vtnrx_tq); 2840 rxq->vtnrx_tq = NULL; 2841 } 2842 2843 txq = &sc->vtnet_txqs[i]; 2844 if (txq->vtntx_tq != NULL) { 2845 taskqueue_free(txq->vtntx_tq); 2846 txq->vtntx_tq = NULL; 2847 } 2848 } 2849 } 2850 2851 static void 2852 vtnet_drain_taskqueues(struct vtnet_softc *sc) 2853 { 2854 struct vtnet_rxq *rxq; 2855 struct vtnet_txq *txq; 2856 int i; 2857 2858 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2859 rxq = &sc->vtnet_rxqs[i]; 2860 if (rxq->vtnrx_tq != NULL) 2861 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2862 2863 txq = &sc->vtnet_txqs[i]; 2864 if (txq->vtntx_tq != NULL) { 2865 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 2866 #ifndef VTNET_LEGACY_TX 2867 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 2868 #endif 2869 } 2870 } 2871 } 2872 2873 static void 2874 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 2875 { 2876 struct vtnet_rxq *rxq; 2877 struct vtnet_txq *txq; 2878 int i; 2879 2880 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2881 rxq = &sc->vtnet_rxqs[i]; 2882 vtnet_rxq_free_mbufs(rxq); 2883 2884 txq = &sc->vtnet_txqs[i]; 2885 vtnet_txq_free_mbufs(txq); 2886 } 2887 } 2888 2889 static void 2890 vtnet_stop_rendezvous(struct vtnet_softc *sc) 2891 { 2892 struct vtnet_rxq *rxq; 2893 struct vtnet_txq *txq; 2894 int i; 2895 2896 /* 2897 * Lock and unlock the per-queue mutex so we known the stop 2898 * state is visible. Doing only the active queues should be 2899 * sufficient, but it does not cost much extra to do all the 2900 * queues. Note we hold the core mutex here too. 2901 */ 2902 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2903 rxq = &sc->vtnet_rxqs[i]; 2904 VTNET_RXQ_LOCK(rxq); 2905 VTNET_RXQ_UNLOCK(rxq); 2906 2907 txq = &sc->vtnet_txqs[i]; 2908 VTNET_TXQ_LOCK(txq); 2909 VTNET_TXQ_UNLOCK(txq); 2910 } 2911 } 2912 2913 static void 2914 vtnet_stop(struct vtnet_softc *sc) 2915 { 2916 device_t dev; 2917 struct ifnet *ifp; 2918 2919 dev = sc->vtnet_dev; 2920 ifp = sc->vtnet_ifp; 2921 2922 VTNET_CORE_LOCK_ASSERT(sc); 2923 2924 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2925 sc->vtnet_link_active = 0; 2926 callout_stop(&sc->vtnet_tick_ch); 2927 2928 /* Only advisory. */ 2929 vtnet_disable_interrupts(sc); 2930 2931 /* 2932 * Stop the host adapter. This resets it to the pre-initialized 2933 * state. It will not generate any interrupts until after it is 2934 * reinitialized. 2935 */ 2936 virtio_stop(dev); 2937 vtnet_stop_rendezvous(sc); 2938 2939 /* Free any mbufs left in the virtqueues. */ 2940 vtnet_drain_rxtx_queues(sc); 2941 } 2942 2943 static int 2944 vtnet_virtio_reinit(struct vtnet_softc *sc) 2945 { 2946 device_t dev; 2947 struct ifnet *ifp; 2948 uint64_t features; 2949 int mask, error; 2950 2951 dev = sc->vtnet_dev; 2952 ifp = sc->vtnet_ifp; 2953 features = sc->vtnet_features; 2954 2955 mask = 0; 2956 #if defined(INET) 2957 mask |= IFCAP_RXCSUM; 2958 #endif 2959 #if defined (INET6) 2960 mask |= IFCAP_RXCSUM_IPV6; 2961 #endif 2962 2963 /* 2964 * Re-negotiate with the host, removing any disabled receive 2965 * features. Transmit features are disabled only on our side 2966 * via if_capenable and if_hwassist. 2967 */ 2968 2969 if (ifp->if_capabilities & mask) { 2970 /* 2971 * We require both IPv4 and IPv6 offloading to be enabled 2972 * in order to negotiated it: VirtIO does not distinguish 2973 * between the two. 2974 */ 2975 if ((ifp->if_capenable & mask) != mask) 2976 features &= ~VIRTIO_NET_F_GUEST_CSUM; 2977 } 2978 2979 if (ifp->if_capabilities & IFCAP_LRO) { 2980 if ((ifp->if_capenable & IFCAP_LRO) == 0) 2981 features &= ~VTNET_LRO_FEATURES; 2982 } 2983 2984 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) { 2985 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 2986 features &= ~VIRTIO_NET_F_CTRL_VLAN; 2987 } 2988 2989 error = virtio_reinit(dev, features); 2990 if (error) 2991 device_printf(dev, "virtio reinit error %d\n", error); 2992 2993 return (error); 2994 } 2995 2996 static void 2997 vtnet_init_rx_filters(struct vtnet_softc *sc) 2998 { 2999 struct ifnet *ifp; 3000 3001 ifp = sc->vtnet_ifp; 3002 3003 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3004 /* Restore promiscuous and all-multicast modes. */ 3005 vtnet_rx_filter(sc); 3006 /* Restore filtered MAC addresses. */ 3007 vtnet_rx_filter_mac(sc); 3008 } 3009 3010 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 3011 vtnet_rx_filter_vlan(sc); 3012 } 3013 3014 static int 3015 vtnet_init_rx_queues(struct vtnet_softc *sc) 3016 { 3017 device_t dev; 3018 struct vtnet_rxq *rxq; 3019 int i, clsize, error; 3020 3021 dev = sc->vtnet_dev; 3022 3023 /* 3024 * Use the new cluster size if one has been set (via a MTU 3025 * change). Otherwise, use the standard 2K clusters. 3026 * 3027 * BMV: It might make sense to use page sized clusters as 3028 * the default (depending on the features negotiated). 3029 */ 3030 if (sc->vtnet_rx_new_clsize != 0) { 3031 clsize = sc->vtnet_rx_new_clsize; 3032 sc->vtnet_rx_new_clsize = 0; 3033 } else 3034 clsize = MCLBYTES; 3035 3036 sc->vtnet_rx_clsize = clsize; 3037 sc->vtnet_rx_nmbufs = VTNET_NEEDED_RX_MBUFS(sc, clsize); 3038 3039 KASSERT(sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS || 3040 sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3041 ("%s: too many rx mbufs %d for %d segments", __func__, 3042 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3043 3044 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3045 rxq = &sc->vtnet_rxqs[i]; 3046 3047 /* Hold the lock to satisfy asserts. */ 3048 VTNET_RXQ_LOCK(rxq); 3049 error = vtnet_rxq_populate(rxq); 3050 VTNET_RXQ_UNLOCK(rxq); 3051 3052 if (error) { 3053 device_printf(dev, 3054 "cannot allocate mbufs for Rx queue %d\n", i); 3055 return (error); 3056 } 3057 } 3058 3059 return (0); 3060 } 3061 3062 static int 3063 vtnet_init_tx_queues(struct vtnet_softc *sc) 3064 { 3065 struct vtnet_txq *txq; 3066 int i; 3067 3068 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3069 txq = &sc->vtnet_txqs[i]; 3070 txq->vtntx_watchdog = 0; 3071 } 3072 3073 return (0); 3074 } 3075 3076 static int 3077 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3078 { 3079 int error; 3080 3081 error = vtnet_init_rx_queues(sc); 3082 if (error) 3083 return (error); 3084 3085 error = vtnet_init_tx_queues(sc); 3086 if (error) 3087 return (error); 3088 3089 return (0); 3090 } 3091 3092 static void 3093 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3094 { 3095 device_t dev; 3096 int npairs; 3097 3098 dev = sc->vtnet_dev; 3099 3100 if ((sc->vtnet_flags & VTNET_FLAG_MULTIQ) == 0) { 3101 sc->vtnet_act_vq_pairs = 1; 3102 return; 3103 } 3104 3105 npairs = sc->vtnet_requested_vq_pairs; 3106 3107 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3108 device_printf(dev, 3109 "cannot set active queue pairs to %d\n", npairs); 3110 npairs = 1; 3111 } 3112 3113 sc->vtnet_act_vq_pairs = npairs; 3114 } 3115 3116 static int 3117 vtnet_reinit(struct vtnet_softc *sc) 3118 { 3119 struct ifnet *ifp; 3120 int error; 3121 3122 ifp = sc->vtnet_ifp; 3123 3124 /* Use the current MAC address. */ 3125 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3126 vtnet_set_hwaddr(sc); 3127 3128 vtnet_set_active_vq_pairs(sc); 3129 3130 ifp->if_hwassist = 0; 3131 if (ifp->if_capenable & IFCAP_TXCSUM) 3132 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3133 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3134 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3135 if (ifp->if_capenable & IFCAP_TSO4) 3136 ifp->if_hwassist |= CSUM_IP_TSO; 3137 if (ifp->if_capenable & IFCAP_TSO6) 3138 ifp->if_hwassist |= CSUM_IP6_TSO; 3139 3140 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3141 vtnet_init_rx_filters(sc); 3142 3143 error = vtnet_init_rxtx_queues(sc); 3144 if (error) 3145 return (error); 3146 3147 vtnet_enable_interrupts(sc); 3148 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3149 3150 return (0); 3151 } 3152 3153 static void 3154 vtnet_init_locked(struct vtnet_softc *sc) 3155 { 3156 device_t dev; 3157 struct ifnet *ifp; 3158 3159 dev = sc->vtnet_dev; 3160 ifp = sc->vtnet_ifp; 3161 3162 VTNET_CORE_LOCK_ASSERT(sc); 3163 3164 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3165 return; 3166 3167 vtnet_stop(sc); 3168 3169 /* Reinitialize with the host. */ 3170 if (vtnet_virtio_reinit(sc) != 0) 3171 goto fail; 3172 3173 if (vtnet_reinit(sc) != 0) 3174 goto fail; 3175 3176 virtio_reinit_complete(dev); 3177 3178 vtnet_update_link_status(sc); 3179 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3180 3181 return; 3182 3183 fail: 3184 vtnet_stop(sc); 3185 } 3186 3187 static void 3188 vtnet_init(void *xsc) 3189 { 3190 struct vtnet_softc *sc; 3191 3192 sc = xsc; 3193 3194 VTNET_CORE_LOCK(sc); 3195 vtnet_init_locked(sc); 3196 VTNET_CORE_UNLOCK(sc); 3197 } 3198 3199 static void 3200 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3201 { 3202 struct virtqueue *vq; 3203 3204 vq = sc->vtnet_ctrl_vq; 3205 3206 /* 3207 * The control virtqueue is only polled and therefore it should 3208 * already be empty. 3209 */ 3210 KASSERT(virtqueue_empty(vq), 3211 ("%s: ctrl vq %p not empty", __func__, vq)); 3212 } 3213 3214 static void 3215 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3216 struct sglist *sg, int readable, int writable) 3217 { 3218 struct virtqueue *vq; 3219 3220 vq = sc->vtnet_ctrl_vq; 3221 3222 VTNET_CORE_LOCK_ASSERT(sc); 3223 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ, 3224 ("%s: CTRL_VQ feature not negotiated", __func__)); 3225 3226 if (!virtqueue_empty(vq)) 3227 return; 3228 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0) 3229 return; 3230 3231 /* 3232 * Poll for the response, but the command is likely already 3233 * done when we return from the notify. 3234 */ 3235 virtqueue_notify(vq); 3236 virtqueue_poll(vq, NULL); 3237 } 3238 3239 static int 3240 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3241 { 3242 struct virtio_net_ctrl_hdr hdr __aligned(2); 3243 struct sglist_seg segs[3]; 3244 struct sglist sg; 3245 uint8_t ack; 3246 int error; 3247 3248 hdr.class = VIRTIO_NET_CTRL_MAC; 3249 hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3250 ack = VIRTIO_NET_ERR; 3251 3252 sglist_init(&sg, 3, segs); 3253 error = 0; 3254 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3255 error |= sglist_append(&sg, hwaddr, ETHER_ADDR_LEN); 3256 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3257 KASSERT(error == 0 && sg.sg_nseg == 3, 3258 ("%s: error %d adding set MAC msg to sglist", __func__, error)); 3259 3260 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3261 3262 return (ack == VIRTIO_NET_OK ? 0 : EIO); 3263 } 3264 3265 static int 3266 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3267 { 3268 struct sglist_seg segs[3]; 3269 struct sglist sg; 3270 struct { 3271 struct virtio_net_ctrl_hdr hdr; 3272 uint8_t pad1; 3273 struct virtio_net_ctrl_mq mq; 3274 uint8_t pad2; 3275 uint8_t ack; 3276 } s __aligned(2); 3277 int error; 3278 3279 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3280 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3281 s.mq.virtqueue_pairs = npairs; 3282 s.ack = VIRTIO_NET_ERR; 3283 3284 sglist_init(&sg, 3, segs); 3285 error = 0; 3286 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3287 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3288 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3289 KASSERT(error == 0 && sg.sg_nseg == 3, 3290 ("%s: error %d adding MQ message to sglist", __func__, error)); 3291 3292 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3293 3294 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3295 } 3296 3297 static int 3298 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on) 3299 { 3300 struct sglist_seg segs[3]; 3301 struct sglist sg; 3302 struct { 3303 struct virtio_net_ctrl_hdr hdr; 3304 uint8_t pad1; 3305 uint8_t onoff; 3306 uint8_t pad2; 3307 uint8_t ack; 3308 } s __aligned(2); 3309 int error; 3310 3311 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3312 ("%s: CTRL_RX feature not negotiated", __func__)); 3313 3314 s.hdr.class = VIRTIO_NET_CTRL_RX; 3315 s.hdr.cmd = cmd; 3316 s.onoff = !!on; 3317 s.ack = VIRTIO_NET_ERR; 3318 3319 sglist_init(&sg, 3, segs); 3320 error = 0; 3321 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3322 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3323 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3324 KASSERT(error == 0 && sg.sg_nseg == 3, 3325 ("%s: error %d adding Rx message to sglist", __func__, error)); 3326 3327 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3328 3329 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3330 } 3331 3332 static int 3333 vtnet_set_promisc(struct vtnet_softc *sc, int on) 3334 { 3335 3336 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3337 } 3338 3339 static int 3340 vtnet_set_allmulti(struct vtnet_softc *sc, int on) 3341 { 3342 3343 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3344 } 3345 3346 /* 3347 * The device defaults to promiscuous mode for backwards compatibility. 3348 * Turn it off at attach time if possible. 3349 */ 3350 static void 3351 vtnet_attach_disable_promisc(struct vtnet_softc *sc) 3352 { 3353 struct ifnet *ifp; 3354 3355 ifp = sc->vtnet_ifp; 3356 3357 VTNET_CORE_LOCK(sc); 3358 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) { 3359 ifp->if_flags |= IFF_PROMISC; 3360 } else if (vtnet_set_promisc(sc, 0) != 0) { 3361 ifp->if_flags |= IFF_PROMISC; 3362 device_printf(sc->vtnet_dev, 3363 "cannot disable default promiscuous mode\n"); 3364 } 3365 VTNET_CORE_UNLOCK(sc); 3366 } 3367 3368 static void 3369 vtnet_rx_filter(struct vtnet_softc *sc) 3370 { 3371 device_t dev; 3372 struct ifnet *ifp; 3373 3374 dev = sc->vtnet_dev; 3375 ifp = sc->vtnet_ifp; 3376 3377 VTNET_CORE_LOCK_ASSERT(sc); 3378 3379 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) 3380 device_printf(dev, "cannot %s promiscuous mode\n", 3381 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3382 3383 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) 3384 device_printf(dev, "cannot %s all-multicast mode\n", 3385 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3386 } 3387 3388 static u_int 3389 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3390 { 3391 struct vtnet_softc *sc = arg; 3392 3393 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3394 return (0); 3395 3396 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3397 bcopy(LLADDR(sdl), 3398 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3399 ETHER_ADDR_LEN); 3400 3401 return (1); 3402 } 3403 3404 static u_int 3405 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3406 { 3407 struct vtnet_mac_filter *filter = arg; 3408 3409 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3410 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3411 ETHER_ADDR_LEN); 3412 3413 return (1); 3414 } 3415 3416 static void 3417 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3418 { 3419 struct virtio_net_ctrl_hdr hdr __aligned(2); 3420 struct vtnet_mac_filter *filter; 3421 struct sglist_seg segs[4]; 3422 struct sglist sg; 3423 struct ifnet *ifp; 3424 bool promisc, allmulti; 3425 u_int ucnt, mcnt; 3426 int error; 3427 uint8_t ack; 3428 3429 ifp = sc->vtnet_ifp; 3430 filter = sc->vtnet_mac_filter; 3431 3432 VTNET_CORE_LOCK_ASSERT(sc); 3433 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3434 ("%s: CTRL_RX feature not negotiated", __func__)); 3435 3436 /* Unicast MAC addresses: */ 3437 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3438 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3439 3440 if (promisc) { 3441 filter->vmf_unicast.nentries = 0; 3442 if_printf(ifp, "more than %d MAC addresses assigned, " 3443 "falling back to promiscuous mode\n", 3444 VTNET_MAX_MAC_ENTRIES); 3445 } else 3446 filter->vmf_unicast.nentries = ucnt; 3447 3448 /* Multicast MAC addresses: */ 3449 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3450 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3451 3452 if (allmulti) { 3453 filter->vmf_multicast.nentries = 0; 3454 if_printf(ifp, "more than %d multicast MAC addresses " 3455 "assigned, falling back to all-multicast mode\n", 3456 VTNET_MAX_MAC_ENTRIES); 3457 } else 3458 filter->vmf_multicast.nentries = mcnt; 3459 3460 if (promisc && allmulti) 3461 goto out; 3462 3463 hdr.class = VIRTIO_NET_CTRL_MAC; 3464 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3465 ack = VIRTIO_NET_ERR; 3466 3467 sglist_init(&sg, 4, segs); 3468 error = 0; 3469 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3470 error |= sglist_append(&sg, &filter->vmf_unicast, 3471 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN); 3472 error |= sglist_append(&sg, &filter->vmf_multicast, 3473 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN); 3474 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3475 KASSERT(error == 0 && sg.sg_nseg == 4, 3476 ("%s: error %d adding MAC filter msg to sglist", __func__, error)); 3477 3478 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3479 3480 if (ack != VIRTIO_NET_OK) 3481 if_printf(ifp, "error setting host MAC filter table\n"); 3482 3483 out: 3484 if (promisc != 0 && vtnet_set_promisc(sc, 1) != 0) 3485 if_printf(ifp, "cannot enable promiscuous mode\n"); 3486 if (allmulti != 0 && vtnet_set_allmulti(sc, 1) != 0) 3487 if_printf(ifp, "cannot enable all-multicast mode\n"); 3488 } 3489 3490 static int 3491 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3492 { 3493 struct sglist_seg segs[3]; 3494 struct sglist sg; 3495 struct { 3496 struct virtio_net_ctrl_hdr hdr; 3497 uint8_t pad1; 3498 uint16_t tag; 3499 uint8_t pad2; 3500 uint8_t ack; 3501 } s __aligned(2); 3502 int error; 3503 3504 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3505 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3506 s.tag = tag; 3507 s.ack = VIRTIO_NET_ERR; 3508 3509 sglist_init(&sg, 3, segs); 3510 error = 0; 3511 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3512 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3513 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3514 KASSERT(error == 0 && sg.sg_nseg == 3, 3515 ("%s: error %d adding VLAN message to sglist", __func__, error)); 3516 3517 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3518 3519 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3520 } 3521 3522 static void 3523 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3524 { 3525 uint32_t w; 3526 uint16_t tag; 3527 int i, bit; 3528 3529 VTNET_CORE_LOCK_ASSERT(sc); 3530 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 3531 ("%s: VLAN_FILTER feature not negotiated", __func__)); 3532 3533 /* Enable the filter for each configured VLAN. */ 3534 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3535 w = sc->vtnet_vlan_filter[i]; 3536 3537 while ((bit = ffs(w) - 1) != -1) { 3538 w &= ~(1 << bit); 3539 tag = sizeof(w) * CHAR_BIT * i + bit; 3540 3541 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3542 device_printf(sc->vtnet_dev, 3543 "cannot enable VLAN %d filter\n", tag); 3544 } 3545 } 3546 } 3547 } 3548 3549 static void 3550 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3551 { 3552 struct ifnet *ifp; 3553 int idx, bit; 3554 3555 ifp = sc->vtnet_ifp; 3556 idx = (tag >> 5) & 0x7F; 3557 bit = tag & 0x1F; 3558 3559 if (tag == 0 || tag > 4095) 3560 return; 3561 3562 VTNET_CORE_LOCK(sc); 3563 3564 if (add) 3565 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3566 else 3567 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3568 3569 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3570 ifp->if_drv_flags & IFF_DRV_RUNNING && 3571 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3572 device_printf(sc->vtnet_dev, 3573 "cannot %s VLAN %d %s the host filter table\n", 3574 add ? "add" : "remove", tag, add ? "to" : "from"); 3575 } 3576 3577 VTNET_CORE_UNLOCK(sc); 3578 } 3579 3580 static void 3581 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3582 { 3583 3584 if (ifp->if_softc != arg) 3585 return; 3586 3587 vtnet_update_vlan_filter(arg, 1, tag); 3588 } 3589 3590 static void 3591 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3592 { 3593 3594 if (ifp->if_softc != arg) 3595 return; 3596 3597 vtnet_update_vlan_filter(arg, 0, tag); 3598 } 3599 3600 static int 3601 vtnet_is_link_up(struct vtnet_softc *sc) 3602 { 3603 device_t dev; 3604 struct ifnet *ifp; 3605 uint16_t status; 3606 3607 dev = sc->vtnet_dev; 3608 ifp = sc->vtnet_ifp; 3609 3610 if ((ifp->if_capabilities & IFCAP_LINKSTATE) == 0) 3611 status = VIRTIO_NET_S_LINK_UP; 3612 else 3613 status = virtio_read_dev_config_2(dev, 3614 offsetof(struct virtio_net_config, status)); 3615 3616 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3617 } 3618 3619 static void 3620 vtnet_update_link_status(struct vtnet_softc *sc) 3621 { 3622 struct ifnet *ifp; 3623 int link; 3624 3625 ifp = sc->vtnet_ifp; 3626 3627 VTNET_CORE_LOCK_ASSERT(sc); 3628 link = vtnet_is_link_up(sc); 3629 3630 /* Notify if the link status has changed. */ 3631 if (link != 0 && sc->vtnet_link_active == 0) { 3632 sc->vtnet_link_active = 1; 3633 if_link_state_change(ifp, LINK_STATE_UP); 3634 } else if (link == 0 && sc->vtnet_link_active != 0) { 3635 sc->vtnet_link_active = 0; 3636 if_link_state_change(ifp, LINK_STATE_DOWN); 3637 } 3638 } 3639 3640 static int 3641 vtnet_ifmedia_upd(struct ifnet *ifp) 3642 { 3643 struct vtnet_softc *sc; 3644 struct ifmedia *ifm; 3645 3646 sc = ifp->if_softc; 3647 ifm = &sc->vtnet_media; 3648 3649 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) 3650 return (EINVAL); 3651 3652 return (0); 3653 } 3654 3655 static void 3656 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3657 { 3658 struct vtnet_softc *sc; 3659 3660 sc = ifp->if_softc; 3661 3662 ifmr->ifm_status = IFM_AVALID; 3663 ifmr->ifm_active = IFM_ETHER; 3664 3665 VTNET_CORE_LOCK(sc); 3666 if (vtnet_is_link_up(sc) != 0) { 3667 ifmr->ifm_status |= IFM_ACTIVE; 3668 ifmr->ifm_active |= VTNET_MEDIATYPE; 3669 } else 3670 ifmr->ifm_active |= IFM_NONE; 3671 VTNET_CORE_UNLOCK(sc); 3672 } 3673 3674 static void 3675 vtnet_set_hwaddr(struct vtnet_softc *sc) 3676 { 3677 device_t dev; 3678 int i; 3679 3680 dev = sc->vtnet_dev; 3681 3682 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 3683 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0) 3684 device_printf(dev, "unable to set MAC address\n"); 3685 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3686 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3687 virtio_write_dev_config_1(dev, 3688 offsetof(struct virtio_net_config, mac) + i, 3689 sc->vtnet_hwaddr[i]); 3690 } 3691 } 3692 } 3693 3694 static void 3695 vtnet_get_hwaddr(struct vtnet_softc *sc) 3696 { 3697 device_t dev; 3698 int i; 3699 3700 dev = sc->vtnet_dev; 3701 3702 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) { 3703 /* 3704 * Generate a random locally administered unicast address. 3705 * 3706 * It would be nice to generate the same MAC address across 3707 * reboots, but it seems all the hosts currently available 3708 * support the MAC feature, so this isn't too important. 3709 */ 3710 sc->vtnet_hwaddr[0] = 0xB2; 3711 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3712 vtnet_set_hwaddr(sc); 3713 return; 3714 } 3715 3716 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3717 sc->vtnet_hwaddr[i] = virtio_read_dev_config_1(dev, 3718 offsetof(struct virtio_net_config, mac) + i); 3719 } 3720 } 3721 3722 static void 3723 vtnet_vlan_tag_remove(struct mbuf *m) 3724 { 3725 struct ether_vlan_header *evh; 3726 3727 evh = mtod(m, struct ether_vlan_header *); 3728 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 3729 m->m_flags |= M_VLANTAG; 3730 3731 /* Strip the 802.1Q header. */ 3732 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 3733 ETHER_HDR_LEN - ETHER_TYPE_LEN); 3734 m_adj(m, ETHER_VLAN_ENCAP_LEN); 3735 } 3736 3737 static void 3738 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 3739 { 3740 int limit; 3741 3742 limit = vtnet_tunable_int(sc, "rx_process_limit", 3743 vtnet_rx_process_limit); 3744 if (limit < 0) 3745 limit = INT_MAX; 3746 sc->vtnet_rx_process_limit = limit; 3747 } 3748 3749 static void 3750 vtnet_set_tx_intr_threshold(struct vtnet_softc *sc) 3751 { 3752 int size, thresh; 3753 3754 size = virtqueue_size(sc->vtnet_txqs[0].vtntx_vq); 3755 3756 /* 3757 * The Tx interrupt is disabled until the queue free count falls 3758 * below our threshold. Completed frames are drained from the Tx 3759 * virtqueue before transmitting new frames and in the watchdog 3760 * callout, so the frequency of Tx interrupts is greatly reduced, 3761 * at the cost of not freeing mbufs as quickly as they otherwise 3762 * would be. 3763 * 3764 * N.B. We assume all the Tx queues are the same size. 3765 */ 3766 thresh = size / 4; 3767 3768 /* 3769 * Without indirect descriptors, leave enough room for the most 3770 * segments we handle. 3771 */ 3772 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 3773 thresh < sc->vtnet_tx_nsegs) 3774 thresh = sc->vtnet_tx_nsegs; 3775 3776 sc->vtnet_tx_intr_thresh = thresh; 3777 } 3778 3779 static void 3780 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 3781 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 3782 { 3783 struct sysctl_oid *node; 3784 struct sysctl_oid_list *list; 3785 struct vtnet_rxq_stats *stats; 3786 char namebuf[16]; 3787 3788 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 3789 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3790 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 3791 list = SYSCTL_CHILDREN(node); 3792 3793 stats = &rxq->vtnrx_stats; 3794 3795 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 3796 &stats->vrxs_ipackets, "Receive packets"); 3797 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 3798 &stats->vrxs_ibytes, "Receive bytes"); 3799 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 3800 &stats->vrxs_iqdrops, "Receive drops"); 3801 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 3802 &stats->vrxs_ierrors, "Receive errors"); 3803 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3804 &stats->vrxs_csum, "Receive checksum offloaded"); 3805 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 3806 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 3807 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3808 &stats->vrxs_rescheduled, 3809 "Receive interrupt handler rescheduled"); 3810 } 3811 3812 static void 3813 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 3814 struct sysctl_oid_list *child, struct vtnet_txq *txq) 3815 { 3816 struct sysctl_oid *node; 3817 struct sysctl_oid_list *list; 3818 struct vtnet_txq_stats *stats; 3819 char namebuf[16]; 3820 3821 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 3822 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3823 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 3824 list = SYSCTL_CHILDREN(node); 3825 3826 stats = &txq->vtntx_stats; 3827 3828 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 3829 &stats->vtxs_opackets, "Transmit packets"); 3830 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 3831 &stats->vtxs_obytes, "Transmit bytes"); 3832 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 3833 &stats->vtxs_omcasts, "Transmit multicasts"); 3834 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3835 &stats->vtxs_csum, "Transmit checksum offloaded"); 3836 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 3837 &stats->vtxs_tso, "Transmit segmentation offloaded"); 3838 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3839 &stats->vtxs_rescheduled, 3840 "Transmit interrupt handler rescheduled"); 3841 } 3842 3843 static void 3844 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 3845 { 3846 device_t dev; 3847 struct sysctl_ctx_list *ctx; 3848 struct sysctl_oid *tree; 3849 struct sysctl_oid_list *child; 3850 int i; 3851 3852 dev = sc->vtnet_dev; 3853 ctx = device_get_sysctl_ctx(dev); 3854 tree = device_get_sysctl_tree(dev); 3855 child = SYSCTL_CHILDREN(tree); 3856 3857 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3858 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 3859 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 3860 } 3861 } 3862 3863 static void 3864 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 3865 struct sysctl_oid_list *child, struct vtnet_softc *sc) 3866 { 3867 struct vtnet_statistics *stats; 3868 struct vtnet_rxq_stats rxaccum; 3869 struct vtnet_txq_stats txaccum; 3870 3871 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3872 3873 stats = &sc->vtnet_stats; 3874 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 3875 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 3876 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 3877 stats->tx_csum_offloaded = txaccum.vtxs_csum; 3878 stats->tx_tso_offloaded = txaccum.vtxs_tso; 3879 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 3880 3881 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 3882 CTLFLAG_RD, &stats->mbuf_alloc_failed, 3883 "Mbuf cluster allocation failures"); 3884 3885 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 3886 CTLFLAG_RD, &stats->rx_frame_too_large, 3887 "Received frame larger than the mbuf chain"); 3888 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 3889 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 3890 "Enqueuing the replacement receive mbuf failed"); 3891 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 3892 CTLFLAG_RD, &stats->rx_mergeable_failed, 3893 "Mergeable buffers receive failures"); 3894 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 3895 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 3896 "Received checksum offloaded buffer with unsupported " 3897 "Ethernet type"); 3898 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 3899 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 3900 "Received checksum offloaded buffer with incorrect IP protocol"); 3901 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 3902 CTLFLAG_RD, &stats->rx_csum_bad_offset, 3903 "Received checksum offloaded buffer with incorrect offset"); 3904 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 3905 CTLFLAG_RD, &stats->rx_csum_bad_proto, 3906 "Received checksum offloaded buffer with incorrect protocol"); 3907 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 3908 CTLFLAG_RD, &stats->rx_csum_failed, 3909 "Received buffer checksum offload failed"); 3910 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 3911 CTLFLAG_RD, &stats->rx_csum_offloaded, 3912 "Received buffer checksum offload succeeded"); 3913 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 3914 CTLFLAG_RD, &stats->rx_task_rescheduled, 3915 "Times the receive interrupt task rescheduled itself"); 3916 3917 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_bad_ethtype", 3918 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 3919 "Aborted transmit of checksum offloaded buffer with unknown " 3920 "Ethernet type"); 3921 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_bad_ethtype", 3922 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 3923 "Aborted transmit of TSO buffer with unknown Ethernet type"); 3924 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 3925 CTLFLAG_RD, &stats->tx_tso_not_tcp, 3926 "Aborted transmit of TSO buffer with non TCP protocol"); 3927 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 3928 CTLFLAG_RD, &stats->tx_defragged, 3929 "Transmit mbufs defragged"); 3930 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 3931 CTLFLAG_RD, &stats->tx_defrag_failed, 3932 "Aborted transmit of buffer because defrag failed"); 3933 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 3934 CTLFLAG_RD, &stats->tx_csum_offloaded, 3935 "Offloaded checksum of transmitted buffer"); 3936 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 3937 CTLFLAG_RD, &stats->tx_tso_offloaded, 3938 "Segmentation offload of transmitted buffer"); 3939 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 3940 CTLFLAG_RD, &stats->tx_task_rescheduled, 3941 "Times the transmit interrupt task rescheduled itself"); 3942 } 3943 3944 static void 3945 vtnet_setup_sysctl(struct vtnet_softc *sc) 3946 { 3947 device_t dev; 3948 struct sysctl_ctx_list *ctx; 3949 struct sysctl_oid *tree; 3950 struct sysctl_oid_list *child; 3951 3952 dev = sc->vtnet_dev; 3953 ctx = device_get_sysctl_ctx(dev); 3954 tree = device_get_sysctl_tree(dev); 3955 child = SYSCTL_CHILDREN(tree); 3956 3957 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 3958 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 3959 "Maximum number of supported virtqueue pairs"); 3960 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "requested_vq_pairs", 3961 CTLFLAG_RD, &sc->vtnet_requested_vq_pairs, 0, 3962 "Requested number of virtqueue pairs"); 3963 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 3964 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 3965 "Number of active virtqueue pairs"); 3966 3967 vtnet_setup_stat_sysctl(ctx, child, sc); 3968 } 3969 3970 static int 3971 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 3972 { 3973 3974 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 3975 } 3976 3977 static void 3978 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 3979 { 3980 3981 virtqueue_disable_intr(rxq->vtnrx_vq); 3982 } 3983 3984 static int 3985 vtnet_txq_enable_intr(struct vtnet_txq *txq) 3986 { 3987 struct virtqueue *vq; 3988 3989 vq = txq->vtntx_vq; 3990 3991 if (vtnet_txq_below_threshold(txq) != 0) 3992 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 3993 3994 /* 3995 * The free count is above our threshold. Keep the Tx interrupt 3996 * disabled until the queue is fuller. 3997 */ 3998 return (0); 3999 } 4000 4001 static void 4002 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4003 { 4004 4005 virtqueue_disable_intr(txq->vtntx_vq); 4006 } 4007 4008 static void 4009 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4010 { 4011 int i; 4012 4013 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4014 vtnet_rxq_enable_intr(&sc->vtnet_rxqs[i]); 4015 } 4016 4017 static void 4018 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4019 { 4020 int i; 4021 4022 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4023 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4024 } 4025 4026 static void 4027 vtnet_enable_interrupts(struct vtnet_softc *sc) 4028 { 4029 4030 vtnet_enable_rx_interrupts(sc); 4031 vtnet_enable_tx_interrupts(sc); 4032 } 4033 4034 static void 4035 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4036 { 4037 int i; 4038 4039 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4040 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4041 } 4042 4043 static void 4044 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4045 { 4046 int i; 4047 4048 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4049 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4050 } 4051 4052 static void 4053 vtnet_disable_interrupts(struct vtnet_softc *sc) 4054 { 4055 4056 vtnet_disable_rx_interrupts(sc); 4057 vtnet_disable_tx_interrupts(sc); 4058 } 4059 4060 static int 4061 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4062 { 4063 char path[64]; 4064 4065 snprintf(path, sizeof(path), 4066 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4067 TUNABLE_INT_FETCH(path, &def); 4068 4069 return (def); 4070 } 4071 4072 #ifdef DEBUGNET 4073 static void 4074 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4075 { 4076 struct vtnet_softc *sc; 4077 4078 sc = if_getsoftc(ifp); 4079 4080 VTNET_CORE_LOCK(sc); 4081 *nrxr = sc->vtnet_max_vq_pairs; 4082 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4083 *clsize = sc->vtnet_rx_clsize; 4084 VTNET_CORE_UNLOCK(sc); 4085 } 4086 4087 static void 4088 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4089 { 4090 } 4091 4092 static int 4093 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4094 { 4095 struct vtnet_softc *sc; 4096 struct vtnet_txq *txq; 4097 int error; 4098 4099 sc = if_getsoftc(ifp); 4100 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4101 IFF_DRV_RUNNING) 4102 return (EBUSY); 4103 4104 txq = &sc->vtnet_txqs[0]; 4105 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4106 if (error == 0) 4107 (void)vtnet_txq_notify(txq); 4108 return (error); 4109 } 4110 4111 static int 4112 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4113 { 4114 struct vtnet_softc *sc; 4115 int i; 4116 4117 sc = if_getsoftc(ifp); 4118 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4119 IFF_DRV_RUNNING) 4120 return (EBUSY); 4121 4122 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4123 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4124 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4125 return (0); 4126 } 4127 #endif /* DEBUGNET */ 4128