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_process(struct vtnet_rxq *rxq, int tries); 132 static void vtnet_rx_vq_intr(void *); 133 static void vtnet_rxq_tq_intr(void *, int); 134 135 static int vtnet_txq_below_threshold(struct vtnet_txq *); 136 static int vtnet_txq_notify(struct vtnet_txq *); 137 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 138 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 139 int *, int *, int *); 140 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 141 int, struct virtio_net_hdr *); 142 static struct mbuf * 143 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 144 struct virtio_net_hdr *); 145 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 146 struct vtnet_tx_header *); 147 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 148 #ifdef VTNET_LEGACY_TX 149 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 150 static void vtnet_start(struct ifnet *); 151 #else 152 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 153 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 154 static void vtnet_txq_tq_deferred(void *, int); 155 #endif 156 static void vtnet_txq_start(struct vtnet_txq *); 157 static void vtnet_txq_tq_intr(void *, int); 158 static int vtnet_txq_eof(struct vtnet_txq *); 159 static void vtnet_tx_vq_intr(void *); 160 static void vtnet_tx_start_all(struct vtnet_softc *); 161 162 #ifndef VTNET_LEGACY_TX 163 static void vtnet_qflush(struct ifnet *); 164 #endif 165 166 static int vtnet_watchdog(struct vtnet_txq *); 167 static void vtnet_accum_stats(struct vtnet_softc *, 168 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 169 static void vtnet_tick(void *); 170 171 static void vtnet_start_taskqueues(struct vtnet_softc *); 172 static void vtnet_free_taskqueues(struct vtnet_softc *); 173 static void vtnet_drain_taskqueues(struct vtnet_softc *); 174 175 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 176 static void vtnet_stop_rendezvous(struct vtnet_softc *); 177 static void vtnet_stop(struct vtnet_softc *); 178 static int vtnet_virtio_reinit(struct vtnet_softc *); 179 static void vtnet_init_rx_filters(struct vtnet_softc *); 180 static int vtnet_init_rx_queues(struct vtnet_softc *); 181 static int vtnet_init_tx_queues(struct vtnet_softc *); 182 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 183 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 184 static int vtnet_reinit(struct vtnet_softc *); 185 static void vtnet_init_locked(struct vtnet_softc *, int); 186 static void vtnet_init(void *); 187 188 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 189 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 190 struct sglist *, int, int); 191 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 192 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 193 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int); 194 static int vtnet_set_promisc(struct vtnet_softc *, int); 195 static int vtnet_set_allmulti(struct vtnet_softc *, int); 196 static void vtnet_attach_disable_promisc(struct vtnet_softc *); 197 static void vtnet_rx_filter(struct vtnet_softc *); 198 static void vtnet_rx_filter_mac(struct vtnet_softc *); 199 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 200 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 201 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 202 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 203 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 204 205 static int vtnet_is_link_up(struct vtnet_softc *); 206 static void vtnet_update_link_status(struct vtnet_softc *); 207 static int vtnet_ifmedia_upd(struct ifnet *); 208 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 209 static void vtnet_get_hwaddr(struct vtnet_softc *); 210 static void vtnet_set_hwaddr(struct vtnet_softc *); 211 static void vtnet_vlan_tag_remove(struct mbuf *); 212 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 213 static void vtnet_set_tx_intr_threshold(struct vtnet_softc *); 214 215 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 216 struct sysctl_oid_list *, struct vtnet_rxq *); 217 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 218 struct sysctl_oid_list *, struct vtnet_txq *); 219 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 220 static void vtnet_setup_sysctl(struct vtnet_softc *); 221 222 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 223 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 224 static int vtnet_txq_enable_intr(struct vtnet_txq *); 225 static void vtnet_txq_disable_intr(struct vtnet_txq *); 226 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 227 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 228 static void vtnet_enable_interrupts(struct vtnet_softc *); 229 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 230 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 231 static void vtnet_disable_interrupts(struct vtnet_softc *); 232 233 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 234 235 DEBUGNET_DEFINE(vtnet); 236 237 /* Tunables. */ 238 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 239 "VNET driver parameters"); 240 static int vtnet_csum_disable = 0; 241 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable); 242 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 243 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 244 static int vtnet_tso_disable = 0; 245 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable); 246 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, &vtnet_tso_disable, 247 0, "Disables TCP Segmentation Offload"); 248 static int vtnet_lro_disable = 0; 249 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable); 250 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, &vtnet_lro_disable, 251 0, "Disables TCP Large Receive Offload"); 252 static int vtnet_mq_disable = 0; 253 TUNABLE_INT("hw.vtnet.mq_disable", &vtnet_mq_disable); 254 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, &vtnet_mq_disable, 255 0, "Disables Multi Queue support"); 256 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 257 TUNABLE_INT("hw.vtnet.mq_max_pairs", &vtnet_mq_max_pairs); 258 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 259 &vtnet_mq_max_pairs, 0, "Sets the maximum number of Multi Queue pairs"); 260 static int vtnet_rx_process_limit = 512; 261 TUNABLE_INT("hw.vtnet.rx_process_limit", &vtnet_rx_process_limit); 262 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 263 &vtnet_rx_process_limit, 0, 264 "Limits the number RX segments processed in a single pass"); 265 266 static uma_zone_t vtnet_tx_header_zone; 267 268 static struct virtio_feature_desc vtnet_feature_desc[] = { 269 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 270 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 271 { VIRTIO_NET_F_MAC, "MacAddress" }, 272 { VIRTIO_NET_F_GSO, "TxAllGSO" }, 273 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" }, 274 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" }, 275 { VIRTIO_NET_F_GUEST_ECN, "RxECN" }, 276 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 277 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 278 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 279 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 280 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 281 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 282 { VIRTIO_NET_F_STATUS, "Status" }, 283 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" }, 284 { VIRTIO_NET_F_CTRL_RX, "RxMode" }, 285 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" }, 286 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" }, 287 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 288 { VIRTIO_NET_F_MQ, "Multiqueue" }, 289 { VIRTIO_NET_F_CTRL_MAC_ADDR, "SetMacAddress" }, 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, 0); 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, 0); 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, 0); 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, 0); 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 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1253 rxq->vtnrx_id, NR_RX); 1254 #else /* !DEV_NETMAP */ 1255 void *kring = NULL; 1256 #endif /* !DEV_NETMAP */ 1257 1258 vq = rxq->vtnrx_vq; 1259 last = 0; 1260 1261 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1262 if (kring == NULL) 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. This includes 1823 * the unused num_buffers when using a legacy device. 1824 */ 1825 len += adjsz - sc->vtnet_hdr_size; 1826 } else { 1827 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 1828 nbufs = mhdr->num_buffers; 1829 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1830 } 1831 1832 /* 1833 * If we have enough data in first mbuf, run it through 1834 * pfil as a memory buffer before dequeueing the rest. 1835 */ 1836 if (PFIL_HOOKED_IN(sc->vtnet_pfil) && 1837 len - adjsz >= ETHER_HDR_LEN + max_protohdr) { 1838 pfil = pfil_run_hooks(sc->vtnet_pfil, 1839 m->m_data + adjsz, ifp, 1840 (len - adjsz) | PFIL_MEMPTR | PFIL_IN, NULL); 1841 switch (pfil) { 1842 case PFIL_REALLOCED: 1843 mr = pfil_mem2mbuf(m->m_data + adjsz); 1844 vtnet_rxq_input(rxq, mr, hdr); 1845 /* FALLTHROUGH */ 1846 case PFIL_DROPPED: 1847 case PFIL_CONSUMED: 1848 vtnet_rxq_discard_buf(rxq, m); 1849 if (nbufs > 1) 1850 vtnet_rxq_discard_merged_bufs(rxq, 1851 nbufs); 1852 continue; 1853 default: 1854 KASSERT(pfil == PFIL_PASS, 1855 ("Filter returned %d!\n", pfil)); 1856 }; 1857 pfil_done = true; 1858 } else 1859 pfil_done = false; 1860 1861 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 1862 rxq->vtnrx_stats.vrxs_iqdrops++; 1863 vtnet_rxq_discard_buf(rxq, m); 1864 if (nbufs > 1) 1865 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1866 continue; 1867 } 1868 1869 m->m_pkthdr.len = len; 1870 m->m_pkthdr.rcvif = ifp; 1871 m->m_pkthdr.csum_flags = 0; 1872 1873 if (nbufs > 1) { 1874 /* Dequeue the rest of chain. */ 1875 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 1876 continue; 1877 } 1878 1879 /* 1880 * Save copy of header before we strip it. For both mergeable 1881 * and non-mergeable, the header is at the beginning of the 1882 * mbuf data. We no longer need num_buffers, so always use a 1883 * regular header. 1884 * 1885 * BMV: Is this memcpy() expensive? We know the mbuf data is 1886 * still valid even after the m_adj(). 1887 */ 1888 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr)); 1889 m_adj(m, adjsz); 1890 1891 if (PFIL_HOOKED_IN(sc->vtnet_pfil) && pfil_done == false) { 1892 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 1893 NULL); 1894 switch (pfil) { 1895 case PFIL_DROPPED: 1896 case PFIL_CONSUMED: 1897 continue; 1898 default: 1899 KASSERT(pfil == PFIL_PASS, 1900 ("Filter returned %d!\n", pfil)); 1901 } 1902 } 1903 1904 vtnet_rxq_input(rxq, m, hdr); 1905 1906 /* Must recheck after dropping the Rx lock. */ 1907 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1908 break; 1909 } 1910 1911 if (deq > 0) 1912 virtqueue_notify(vq); 1913 1914 return (count > 0 ? 0 : EAGAIN); 1915 } 1916 1917 static void 1918 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 1919 { 1920 struct vtnet_softc *sc; 1921 struct ifnet *ifp; 1922 int more; 1923 #ifdef DEV_NETMAP 1924 int nmirq; 1925 #endif /* DEV_NETMAP */ 1926 1927 sc = rxq->vtnrx_sc; 1928 ifp = sc->vtnet_ifp; 1929 1930 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 1931 /* 1932 * Ignore this interrupt. Either this is a spurious interrupt 1933 * or multiqueue without per-VQ MSIX so every queue needs to 1934 * be polled (a brain dead configuration we could try harder 1935 * to avoid). 1936 */ 1937 vtnet_rxq_disable_intr(rxq); 1938 return; 1939 } 1940 1941 VTNET_RXQ_LOCK(rxq); 1942 1943 #ifdef DEV_NETMAP 1944 /* 1945 * We call netmap_rx_irq() under lock to prevent concurrent calls. 1946 * This is not necessary to serialize the access to the RX vq, but 1947 * rather to avoid races that may happen if this interface is 1948 * attached to a VALE switch, which would cause received packets 1949 * to stall in the RX queue (nm_kr_tryget() could find the kring 1950 * busy when called from netmap_bwrap_intr_notify()). 1951 */ 1952 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 1953 if (nmirq != NM_IRQ_PASS) { 1954 VTNET_RXQ_UNLOCK(rxq); 1955 if (nmirq == NM_IRQ_RESCHED) { 1956 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1957 } 1958 return; 1959 } 1960 #endif /* DEV_NETMAP */ 1961 1962 again: 1963 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1964 VTNET_RXQ_UNLOCK(rxq); 1965 return; 1966 } 1967 1968 more = vtnet_rxq_eof(rxq); 1969 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 1970 if (!more) 1971 vtnet_rxq_disable_intr(rxq); 1972 /* 1973 * This is an occasional condition or race (when !more), 1974 * so retry a few times before scheduling the taskqueue. 1975 */ 1976 if (tries-- > 0) 1977 goto again; 1978 1979 rxq->vtnrx_stats.vrxs_rescheduled++; 1980 VTNET_RXQ_UNLOCK(rxq); 1981 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 1982 } else 1983 VTNET_RXQ_UNLOCK(rxq); 1984 } 1985 1986 static void 1987 vtnet_rx_vq_intr(void *xrxq) 1988 { 1989 struct vtnet_rxq *rxq; 1990 1991 rxq = xrxq; 1992 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 1993 } 1994 1995 static void 1996 vtnet_rxq_tq_intr(void *xrxq, int pending) 1997 { 1998 struct vtnet_rxq *rxq; 1999 2000 rxq = xrxq; 2001 vtnet_rx_vq_process(rxq, 0); 2002 } 2003 2004 static int 2005 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2006 { 2007 struct vtnet_softc *sc; 2008 struct virtqueue *vq; 2009 2010 sc = txq->vtntx_sc; 2011 vq = txq->vtntx_vq; 2012 2013 return (virtqueue_nfree(vq) <= sc->vtnet_tx_intr_thresh); 2014 } 2015 2016 static int 2017 vtnet_txq_notify(struct vtnet_txq *txq) 2018 { 2019 struct virtqueue *vq; 2020 2021 vq = txq->vtntx_vq; 2022 2023 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2024 virtqueue_notify(vq); 2025 2026 if (vtnet_txq_enable_intr(txq) == 0) 2027 return (0); 2028 2029 /* 2030 * Drain frames that were completed since last checked. If this 2031 * causes the queue to go above the threshold, the caller should 2032 * continue transmitting. 2033 */ 2034 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2035 virtqueue_disable_intr(vq); 2036 return (1); 2037 } 2038 2039 return (0); 2040 } 2041 2042 static void 2043 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2044 { 2045 struct virtqueue *vq; 2046 struct vtnet_tx_header *txhdr; 2047 int last; 2048 #ifdef DEV_NETMAP 2049 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2050 txq->vtntx_id, NR_TX); 2051 #else /* !DEV_NETMAP */ 2052 void *kring = NULL; 2053 #endif /* !DEV_NETMAP */ 2054 2055 vq = txq->vtntx_vq; 2056 last = 0; 2057 2058 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2059 if (kring == NULL) { 2060 m_freem(txhdr->vth_mbuf); 2061 uma_zfree(vtnet_tx_header_zone, txhdr); 2062 } 2063 } 2064 2065 KASSERT(virtqueue_empty(vq), 2066 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2067 } 2068 2069 /* 2070 * BMV: Much of this can go away once we finally have offsets in 2071 * the mbuf packet header. Bug andre@. 2072 */ 2073 static int 2074 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, 2075 int *etype, int *proto, int *start) 2076 { 2077 struct vtnet_softc *sc; 2078 struct ether_vlan_header *evh; 2079 int offset; 2080 2081 sc = txq->vtntx_sc; 2082 2083 evh = mtod(m, struct ether_vlan_header *); 2084 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2085 /* BMV: We should handle nested VLAN tags too. */ 2086 *etype = ntohs(evh->evl_proto); 2087 offset = sizeof(struct ether_vlan_header); 2088 } else { 2089 *etype = ntohs(evh->evl_encap_proto); 2090 offset = sizeof(struct ether_header); 2091 } 2092 2093 switch (*etype) { 2094 #if defined(INET) 2095 case ETHERTYPE_IP: { 2096 struct ip *ip, iphdr; 2097 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2098 m_copydata(m, offset, sizeof(struct ip), 2099 (caddr_t) &iphdr); 2100 ip = &iphdr; 2101 } else 2102 ip = (struct ip *)(m->m_data + offset); 2103 *proto = ip->ip_p; 2104 *start = offset + (ip->ip_hl << 2); 2105 break; 2106 } 2107 #endif 2108 #if defined(INET6) 2109 case ETHERTYPE_IPV6: 2110 *proto = -1; 2111 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2112 /* Assert the network stack sent us a valid packet. */ 2113 KASSERT(*start > offset, 2114 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2115 *start, offset, *proto)); 2116 break; 2117 #endif 2118 default: 2119 sc->vtnet_stats.tx_csum_bad_ethtype++; 2120 return (EINVAL); 2121 } 2122 2123 return (0); 2124 } 2125 2126 static int 2127 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2128 int offset, struct virtio_net_hdr *hdr) 2129 { 2130 static struct timeval lastecn; 2131 static int curecn; 2132 struct vtnet_softc *sc; 2133 struct tcphdr *tcp, tcphdr; 2134 2135 sc = txq->vtntx_sc; 2136 2137 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2138 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2139 tcp = &tcphdr; 2140 } else 2141 tcp = (struct tcphdr *)(m->m_data + offset); 2142 2143 hdr->hdr_len = offset + (tcp->th_off << 2); 2144 hdr->gso_size = m->m_pkthdr.tso_segsz; 2145 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2146 VIRTIO_NET_HDR_GSO_TCPV6; 2147 2148 if (tcp->th_flags & TH_CWR) { 2149 /* 2150 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD, 2151 * ECN support is not on a per-interface basis, but globally via 2152 * the net.inet.tcp.ecn.enable sysctl knob. The default is off. 2153 */ 2154 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2155 if (ppsratecheck(&lastecn, &curecn, 1)) 2156 if_printf(sc->vtnet_ifp, 2157 "TSO with ECN not negotiated with host\n"); 2158 return (ENOTSUP); 2159 } 2160 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2161 } 2162 2163 txq->vtntx_stats.vtxs_tso++; 2164 2165 return (0); 2166 } 2167 2168 static struct mbuf * 2169 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2170 struct virtio_net_hdr *hdr) 2171 { 2172 struct vtnet_softc *sc; 2173 int flags, etype, csum_start, proto, error; 2174 2175 sc = txq->vtntx_sc; 2176 flags = m->m_pkthdr.csum_flags; 2177 2178 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2179 if (error) 2180 goto drop; 2181 2182 if ((etype == ETHERTYPE_IP && flags & VTNET_CSUM_OFFLOAD) || 2183 (etype == ETHERTYPE_IPV6 && flags & VTNET_CSUM_OFFLOAD_IPV6)) { 2184 /* 2185 * We could compare the IP protocol vs the CSUM_ flag too, 2186 * but that really should not be necessary. 2187 */ 2188 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2189 hdr->csum_start = csum_start; 2190 hdr->csum_offset = m->m_pkthdr.csum_data; 2191 txq->vtntx_stats.vtxs_csum++; 2192 } 2193 2194 if (flags & CSUM_TSO) { 2195 if (__predict_false(proto != IPPROTO_TCP)) { 2196 /* Likely failed to correctly parse the mbuf. */ 2197 sc->vtnet_stats.tx_tso_not_tcp++; 2198 goto drop; 2199 } 2200 2201 KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM, 2202 ("%s: mbuf %p TSO without checksum offload %#x", 2203 __func__, m, flags)); 2204 2205 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2206 if (error) 2207 goto drop; 2208 } 2209 2210 return (m); 2211 2212 drop: 2213 m_freem(m); 2214 return (NULL); 2215 } 2216 2217 static int 2218 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2219 struct vtnet_tx_header *txhdr) 2220 { 2221 struct vtnet_softc *sc; 2222 struct virtqueue *vq; 2223 struct sglist *sg; 2224 struct mbuf *m; 2225 int error; 2226 2227 sc = txq->vtntx_sc; 2228 vq = txq->vtntx_vq; 2229 sg = txq->vtntx_sg; 2230 m = *m_head; 2231 2232 sglist_reset(sg); 2233 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2234 KASSERT(error == 0 && sg->sg_nseg == 1, 2235 ("%s: error %d adding header to sglist", __func__, error)); 2236 2237 error = sglist_append_mbuf(sg, m); 2238 if (error) { 2239 m = m_defrag(m, M_NOWAIT); 2240 if (m == NULL) 2241 goto fail; 2242 2243 *m_head = m; 2244 sc->vtnet_stats.tx_defragged++; 2245 2246 error = sglist_append_mbuf(sg, m); 2247 if (error) 2248 goto fail; 2249 } 2250 2251 txhdr->vth_mbuf = m; 2252 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2253 2254 return (error); 2255 2256 fail: 2257 sc->vtnet_stats.tx_defrag_failed++; 2258 m_freem(*m_head); 2259 *m_head = NULL; 2260 2261 return (ENOBUFS); 2262 } 2263 2264 static int 2265 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2266 { 2267 struct vtnet_tx_header *txhdr; 2268 struct virtio_net_hdr *hdr; 2269 struct mbuf *m; 2270 int error; 2271 2272 m = *m_head; 2273 M_ASSERTPKTHDR(m); 2274 2275 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2276 if (txhdr == NULL) { 2277 m_freem(m); 2278 *m_head = NULL; 2279 return (ENOMEM); 2280 } 2281 2282 /* 2283 * Always use the non-mergeable header, regardless if the feature 2284 * was negotiated. For transmit, num_buffers is always zero. The 2285 * vtnet_hdr_size is used to enqueue the correct header size. 2286 */ 2287 hdr = &txhdr->vth_uhdr.hdr; 2288 2289 if (m->m_flags & M_VLANTAG) { 2290 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2291 if ((*m_head = m) == NULL) { 2292 error = ENOBUFS; 2293 goto fail; 2294 } 2295 m->m_flags &= ~M_VLANTAG; 2296 } 2297 2298 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2299 m = vtnet_txq_offload(txq, m, hdr); 2300 if ((*m_head = m) == NULL) { 2301 error = ENOBUFS; 2302 goto fail; 2303 } 2304 } 2305 2306 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2307 if (error == 0) 2308 return (0); 2309 2310 fail: 2311 uma_zfree(vtnet_tx_header_zone, txhdr); 2312 2313 return (error); 2314 } 2315 2316 #ifdef VTNET_LEGACY_TX 2317 2318 static void 2319 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2320 { 2321 struct vtnet_softc *sc; 2322 struct virtqueue *vq; 2323 struct mbuf *m0; 2324 int tries, enq; 2325 2326 sc = txq->vtntx_sc; 2327 vq = txq->vtntx_vq; 2328 tries = 0; 2329 2330 VTNET_TXQ_LOCK_ASSERT(txq); 2331 2332 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2333 sc->vtnet_link_active == 0) 2334 return; 2335 2336 vtnet_txq_eof(txq); 2337 2338 again: 2339 enq = 0; 2340 2341 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2342 if (virtqueue_full(vq)) 2343 break; 2344 2345 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2346 if (m0 == NULL) 2347 break; 2348 2349 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2350 if (m0 != NULL) 2351 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2352 break; 2353 } 2354 2355 enq++; 2356 ETHER_BPF_MTAP(ifp, m0); 2357 } 2358 2359 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2360 if (tries++ < VTNET_NOTIFY_RETRIES) 2361 goto again; 2362 2363 txq->vtntx_stats.vtxs_rescheduled++; 2364 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2365 } 2366 } 2367 2368 static void 2369 vtnet_start(struct ifnet *ifp) 2370 { 2371 struct vtnet_softc *sc; 2372 struct vtnet_txq *txq; 2373 2374 sc = ifp->if_softc; 2375 txq = &sc->vtnet_txqs[0]; 2376 2377 VTNET_TXQ_LOCK(txq); 2378 vtnet_start_locked(txq, ifp); 2379 VTNET_TXQ_UNLOCK(txq); 2380 } 2381 2382 #else /* !VTNET_LEGACY_TX */ 2383 2384 static int 2385 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2386 { 2387 struct vtnet_softc *sc; 2388 struct virtqueue *vq; 2389 struct buf_ring *br; 2390 struct ifnet *ifp; 2391 int enq, tries, error; 2392 2393 sc = txq->vtntx_sc; 2394 vq = txq->vtntx_vq; 2395 br = txq->vtntx_br; 2396 ifp = sc->vtnet_ifp; 2397 tries = 0; 2398 error = 0; 2399 2400 VTNET_TXQ_LOCK_ASSERT(txq); 2401 2402 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2403 sc->vtnet_link_active == 0) { 2404 if (m != NULL) 2405 error = drbr_enqueue(ifp, br, m); 2406 return (error); 2407 } 2408 2409 if (m != NULL) { 2410 error = drbr_enqueue(ifp, br, m); 2411 if (error) 2412 return (error); 2413 } 2414 2415 vtnet_txq_eof(txq); 2416 2417 again: 2418 enq = 0; 2419 2420 while ((m = drbr_peek(ifp, br)) != NULL) { 2421 if (virtqueue_full(vq)) { 2422 drbr_putback(ifp, br, m); 2423 break; 2424 } 2425 2426 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2427 if (m != NULL) 2428 drbr_putback(ifp, br, m); 2429 else 2430 drbr_advance(ifp, br); 2431 break; 2432 } 2433 drbr_advance(ifp, br); 2434 2435 enq++; 2436 ETHER_BPF_MTAP(ifp, m); 2437 } 2438 2439 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2440 if (tries++ < VTNET_NOTIFY_RETRIES) 2441 goto again; 2442 2443 txq->vtntx_stats.vtxs_rescheduled++; 2444 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2445 } 2446 2447 return (0); 2448 } 2449 2450 static int 2451 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2452 { 2453 struct vtnet_softc *sc; 2454 struct vtnet_txq *txq; 2455 int i, npairs, error; 2456 2457 sc = ifp->if_softc; 2458 npairs = sc->vtnet_act_vq_pairs; 2459 2460 /* check if flowid is set */ 2461 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2462 i = m->m_pkthdr.flowid % npairs; 2463 else 2464 i = curcpu % npairs; 2465 2466 txq = &sc->vtnet_txqs[i]; 2467 2468 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2469 error = vtnet_txq_mq_start_locked(txq, m); 2470 VTNET_TXQ_UNLOCK(txq); 2471 } else { 2472 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2473 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2474 } 2475 2476 return (error); 2477 } 2478 2479 static void 2480 vtnet_txq_tq_deferred(void *xtxq, int pending) 2481 { 2482 struct vtnet_softc *sc; 2483 struct vtnet_txq *txq; 2484 2485 txq = xtxq; 2486 sc = txq->vtntx_sc; 2487 2488 VTNET_TXQ_LOCK(txq); 2489 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2490 vtnet_txq_mq_start_locked(txq, NULL); 2491 VTNET_TXQ_UNLOCK(txq); 2492 } 2493 2494 #endif /* VTNET_LEGACY_TX */ 2495 2496 static void 2497 vtnet_txq_start(struct vtnet_txq *txq) 2498 { 2499 struct vtnet_softc *sc; 2500 struct ifnet *ifp; 2501 2502 sc = txq->vtntx_sc; 2503 ifp = sc->vtnet_ifp; 2504 2505 #ifdef VTNET_LEGACY_TX 2506 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2507 vtnet_start_locked(txq, ifp); 2508 #else 2509 if (!drbr_empty(ifp, txq->vtntx_br)) 2510 vtnet_txq_mq_start_locked(txq, NULL); 2511 #endif 2512 } 2513 2514 static void 2515 vtnet_txq_tq_intr(void *xtxq, int pending) 2516 { 2517 struct vtnet_softc *sc; 2518 struct vtnet_txq *txq; 2519 struct ifnet *ifp; 2520 2521 txq = xtxq; 2522 sc = txq->vtntx_sc; 2523 ifp = sc->vtnet_ifp; 2524 2525 VTNET_TXQ_LOCK(txq); 2526 2527 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2528 VTNET_TXQ_UNLOCK(txq); 2529 return; 2530 } 2531 2532 vtnet_txq_eof(txq); 2533 vtnet_txq_start(txq); 2534 2535 VTNET_TXQ_UNLOCK(txq); 2536 } 2537 2538 static int 2539 vtnet_txq_eof(struct vtnet_txq *txq) 2540 { 2541 struct virtqueue *vq; 2542 struct vtnet_tx_header *txhdr; 2543 struct mbuf *m; 2544 int deq; 2545 2546 vq = txq->vtntx_vq; 2547 deq = 0; 2548 VTNET_TXQ_LOCK_ASSERT(txq); 2549 2550 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2551 m = txhdr->vth_mbuf; 2552 deq++; 2553 2554 txq->vtntx_stats.vtxs_opackets++; 2555 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2556 if (m->m_flags & M_MCAST) 2557 txq->vtntx_stats.vtxs_omcasts++; 2558 2559 m_freem(m); 2560 uma_zfree(vtnet_tx_header_zone, txhdr); 2561 } 2562 2563 if (virtqueue_empty(vq)) 2564 txq->vtntx_watchdog = 0; 2565 2566 return (deq); 2567 } 2568 2569 static void 2570 vtnet_tx_vq_intr(void *xtxq) 2571 { 2572 struct vtnet_softc *sc; 2573 struct vtnet_txq *txq; 2574 struct ifnet *ifp; 2575 2576 txq = xtxq; 2577 sc = txq->vtntx_sc; 2578 ifp = sc->vtnet_ifp; 2579 2580 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2581 /* 2582 * Ignore this interrupt. Either this is a spurious interrupt 2583 * or multiqueue without per-VQ MSIX so every queue needs to 2584 * be polled (a brain dead configuration we could try harder 2585 * to avoid). 2586 */ 2587 vtnet_txq_disable_intr(txq); 2588 return; 2589 } 2590 2591 #ifdef DEV_NETMAP 2592 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2593 return; 2594 #endif /* DEV_NETMAP */ 2595 2596 VTNET_TXQ_LOCK(txq); 2597 2598 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2599 VTNET_TXQ_UNLOCK(txq); 2600 return; 2601 } 2602 2603 vtnet_txq_eof(txq); 2604 vtnet_txq_start(txq); 2605 2606 VTNET_TXQ_UNLOCK(txq); 2607 } 2608 2609 static void 2610 vtnet_tx_start_all(struct vtnet_softc *sc) 2611 { 2612 struct vtnet_txq *txq; 2613 int i; 2614 2615 VTNET_CORE_LOCK_ASSERT(sc); 2616 2617 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2618 txq = &sc->vtnet_txqs[i]; 2619 2620 VTNET_TXQ_LOCK(txq); 2621 vtnet_txq_start(txq); 2622 VTNET_TXQ_UNLOCK(txq); 2623 } 2624 } 2625 2626 #ifndef VTNET_LEGACY_TX 2627 static void 2628 vtnet_qflush(struct ifnet *ifp) 2629 { 2630 struct vtnet_softc *sc; 2631 struct vtnet_txq *txq; 2632 struct mbuf *m; 2633 int i; 2634 2635 sc = ifp->if_softc; 2636 2637 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2638 txq = &sc->vtnet_txqs[i]; 2639 2640 VTNET_TXQ_LOCK(txq); 2641 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2642 m_freem(m); 2643 VTNET_TXQ_UNLOCK(txq); 2644 } 2645 2646 if_qflush(ifp); 2647 } 2648 #endif 2649 2650 static int 2651 vtnet_watchdog(struct vtnet_txq *txq) 2652 { 2653 struct ifnet *ifp; 2654 2655 ifp = txq->vtntx_sc->vtnet_ifp; 2656 2657 VTNET_TXQ_LOCK(txq); 2658 if (txq->vtntx_watchdog == 1) { 2659 /* 2660 * Only drain completed frames if the watchdog is about to 2661 * expire. If any frames were drained, there may be enough 2662 * free descriptors now available to transmit queued frames. 2663 * In that case, the timer will immediately be decremented 2664 * below, but the timeout is generous enough that should not 2665 * be a problem. 2666 */ 2667 if (vtnet_txq_eof(txq) != 0) 2668 vtnet_txq_start(txq); 2669 } 2670 2671 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2672 VTNET_TXQ_UNLOCK(txq); 2673 return (0); 2674 } 2675 VTNET_TXQ_UNLOCK(txq); 2676 2677 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2678 return (1); 2679 } 2680 2681 static void 2682 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2683 struct vtnet_txq_stats *txacc) 2684 { 2685 2686 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2687 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2688 2689 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2690 struct vtnet_rxq_stats *rxst; 2691 struct vtnet_txq_stats *txst; 2692 2693 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2694 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2695 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2696 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2697 rxacc->vrxs_csum += rxst->vrxs_csum; 2698 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2699 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2700 2701 txst = &sc->vtnet_txqs[i].vtntx_stats; 2702 txacc->vtxs_opackets += txst->vtxs_opackets; 2703 txacc->vtxs_obytes += txst->vtxs_obytes; 2704 txacc->vtxs_csum += txst->vtxs_csum; 2705 txacc->vtxs_tso += txst->vtxs_tso; 2706 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2707 } 2708 } 2709 2710 static uint64_t 2711 vtnet_get_counter(if_t ifp, ift_counter cnt) 2712 { 2713 struct vtnet_softc *sc; 2714 struct vtnet_rxq_stats rxaccum; 2715 struct vtnet_txq_stats txaccum; 2716 2717 sc = if_getsoftc(ifp); 2718 vtnet_accum_stats(sc, &rxaccum, &txaccum); 2719 2720 switch (cnt) { 2721 case IFCOUNTER_IPACKETS: 2722 return (rxaccum.vrxs_ipackets); 2723 case IFCOUNTER_IQDROPS: 2724 return (rxaccum.vrxs_iqdrops); 2725 case IFCOUNTER_IERRORS: 2726 return (rxaccum.vrxs_ierrors); 2727 case IFCOUNTER_OPACKETS: 2728 return (txaccum.vtxs_opackets); 2729 #ifndef VTNET_LEGACY_TX 2730 case IFCOUNTER_OBYTES: 2731 return (txaccum.vtxs_obytes); 2732 case IFCOUNTER_OMCASTS: 2733 return (txaccum.vtxs_omcasts); 2734 #endif 2735 default: 2736 return (if_get_counter_default(ifp, cnt)); 2737 } 2738 } 2739 2740 static void 2741 vtnet_tick(void *xsc) 2742 { 2743 struct vtnet_softc *sc; 2744 struct ifnet *ifp; 2745 int i, timedout; 2746 2747 sc = xsc; 2748 ifp = sc->vtnet_ifp; 2749 timedout = 0; 2750 2751 VTNET_CORE_LOCK_ASSERT(sc); 2752 2753 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 2754 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 2755 2756 if (timedout != 0) { 2757 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2758 vtnet_init_locked(sc, 0); 2759 } else 2760 callout_schedule(&sc->vtnet_tick_ch, hz); 2761 } 2762 2763 static void 2764 vtnet_start_taskqueues(struct vtnet_softc *sc) 2765 { 2766 device_t dev; 2767 struct vtnet_rxq *rxq; 2768 struct vtnet_txq *txq; 2769 int i, error; 2770 2771 dev = sc->vtnet_dev; 2772 2773 /* 2774 * Errors here are very difficult to recover from - we cannot 2775 * easily fail because, if this is during boot, we will hang 2776 * when freeing any successfully started taskqueues because 2777 * the scheduler isn't up yet. 2778 * 2779 * Most drivers just ignore the return value - it only fails 2780 * with ENOMEM so an error is not likely. 2781 */ 2782 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2783 rxq = &sc->vtnet_rxqs[i]; 2784 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 2785 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 2786 if (error) { 2787 device_printf(dev, "failed to start rx taskq %d\n", 2788 rxq->vtnrx_id); 2789 } 2790 2791 txq = &sc->vtnet_txqs[i]; 2792 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 2793 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 2794 if (error) { 2795 device_printf(dev, "failed to start tx taskq %d\n", 2796 txq->vtntx_id); 2797 } 2798 } 2799 } 2800 2801 static void 2802 vtnet_free_taskqueues(struct vtnet_softc *sc) 2803 { 2804 struct vtnet_rxq *rxq; 2805 struct vtnet_txq *txq; 2806 int i; 2807 2808 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2809 rxq = &sc->vtnet_rxqs[i]; 2810 if (rxq->vtnrx_tq != NULL) { 2811 taskqueue_free(rxq->vtnrx_tq); 2812 rxq->vtnrx_tq = NULL; 2813 } 2814 2815 txq = &sc->vtnet_txqs[i]; 2816 if (txq->vtntx_tq != NULL) { 2817 taskqueue_free(txq->vtntx_tq); 2818 txq->vtntx_tq = NULL; 2819 } 2820 } 2821 } 2822 2823 static void 2824 vtnet_drain_taskqueues(struct vtnet_softc *sc) 2825 { 2826 struct vtnet_rxq *rxq; 2827 struct vtnet_txq *txq; 2828 int i; 2829 2830 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2831 rxq = &sc->vtnet_rxqs[i]; 2832 if (rxq->vtnrx_tq != NULL) 2833 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2834 2835 txq = &sc->vtnet_txqs[i]; 2836 if (txq->vtntx_tq != NULL) { 2837 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 2838 #ifndef VTNET_LEGACY_TX 2839 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 2840 #endif 2841 } 2842 } 2843 } 2844 2845 static void 2846 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 2847 { 2848 struct vtnet_rxq *rxq; 2849 struct vtnet_txq *txq; 2850 int i; 2851 2852 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2853 rxq = &sc->vtnet_rxqs[i]; 2854 vtnet_rxq_free_mbufs(rxq); 2855 2856 txq = &sc->vtnet_txqs[i]; 2857 vtnet_txq_free_mbufs(txq); 2858 } 2859 } 2860 2861 static void 2862 vtnet_stop_rendezvous(struct vtnet_softc *sc) 2863 { 2864 struct vtnet_rxq *rxq; 2865 struct vtnet_txq *txq; 2866 int i; 2867 2868 /* 2869 * Lock and unlock the per-queue mutex so we known the stop 2870 * state is visible. Doing only the active queues should be 2871 * sufficient, but it does not cost much extra to do all the 2872 * queues. Note we hold the core mutex here too. 2873 */ 2874 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2875 rxq = &sc->vtnet_rxqs[i]; 2876 VTNET_RXQ_LOCK(rxq); 2877 VTNET_RXQ_UNLOCK(rxq); 2878 2879 txq = &sc->vtnet_txqs[i]; 2880 VTNET_TXQ_LOCK(txq); 2881 VTNET_TXQ_UNLOCK(txq); 2882 } 2883 } 2884 2885 static void 2886 vtnet_stop(struct vtnet_softc *sc) 2887 { 2888 device_t dev; 2889 struct ifnet *ifp; 2890 2891 dev = sc->vtnet_dev; 2892 ifp = sc->vtnet_ifp; 2893 2894 VTNET_CORE_LOCK_ASSERT(sc); 2895 2896 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2897 sc->vtnet_link_active = 0; 2898 callout_stop(&sc->vtnet_tick_ch); 2899 2900 /* Only advisory. */ 2901 vtnet_disable_interrupts(sc); 2902 2903 /* 2904 * Stop the host adapter. This resets it to the pre-initialized 2905 * state. It will not generate any interrupts until after it is 2906 * reinitialized. 2907 */ 2908 virtio_stop(dev); 2909 vtnet_stop_rendezvous(sc); 2910 2911 /* Free any mbufs left in the virtqueues. */ 2912 vtnet_drain_rxtx_queues(sc); 2913 } 2914 2915 static int 2916 vtnet_virtio_reinit(struct vtnet_softc *sc) 2917 { 2918 device_t dev; 2919 struct ifnet *ifp; 2920 uint64_t features; 2921 int mask, error; 2922 2923 dev = sc->vtnet_dev; 2924 ifp = sc->vtnet_ifp; 2925 features = sc->vtnet_features; 2926 2927 mask = 0; 2928 #if defined(INET) 2929 mask |= IFCAP_RXCSUM; 2930 #endif 2931 #if defined (INET6) 2932 mask |= IFCAP_RXCSUM_IPV6; 2933 #endif 2934 2935 /* 2936 * Re-negotiate with the host, removing any disabled receive 2937 * features. Transmit features are disabled only on our side 2938 * via if_capenable and if_hwassist. 2939 */ 2940 2941 if (ifp->if_capabilities & mask) { 2942 /* 2943 * We require both IPv4 and IPv6 offloading to be enabled 2944 * in order to negotiated it: VirtIO does not distinguish 2945 * between the two. 2946 */ 2947 if ((ifp->if_capenable & mask) != mask) 2948 features &= ~VIRTIO_NET_F_GUEST_CSUM; 2949 } 2950 2951 if (ifp->if_capabilities & IFCAP_LRO) { 2952 if ((ifp->if_capenable & IFCAP_LRO) == 0) 2953 features &= ~VTNET_LRO_FEATURES; 2954 } 2955 2956 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) { 2957 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 2958 features &= ~VIRTIO_NET_F_CTRL_VLAN; 2959 } 2960 2961 error = virtio_reinit(dev, features); 2962 if (error) 2963 device_printf(dev, "virtio reinit error %d\n", error); 2964 2965 return (error); 2966 } 2967 2968 static void 2969 vtnet_init_rx_filters(struct vtnet_softc *sc) 2970 { 2971 struct ifnet *ifp; 2972 2973 ifp = sc->vtnet_ifp; 2974 2975 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 2976 /* Restore promiscuous and all-multicast modes. */ 2977 vtnet_rx_filter(sc); 2978 /* Restore filtered MAC addresses. */ 2979 vtnet_rx_filter_mac(sc); 2980 } 2981 2982 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 2983 vtnet_rx_filter_vlan(sc); 2984 } 2985 2986 static int 2987 vtnet_init_rx_queues(struct vtnet_softc *sc) 2988 { 2989 device_t dev; 2990 struct vtnet_rxq *rxq; 2991 int i, clsize, error; 2992 2993 dev = sc->vtnet_dev; 2994 2995 /* 2996 * Use the new cluster size if one has been set (via a MTU 2997 * change). Otherwise, use the standard 2K clusters. 2998 * 2999 * BMV: It might make sense to use page sized clusters as 3000 * the default (depending on the features negotiated). 3001 */ 3002 if (sc->vtnet_rx_new_clsize != 0) { 3003 clsize = sc->vtnet_rx_new_clsize; 3004 sc->vtnet_rx_new_clsize = 0; 3005 } else 3006 clsize = MCLBYTES; 3007 3008 sc->vtnet_rx_clsize = clsize; 3009 sc->vtnet_rx_nmbufs = VTNET_NEEDED_RX_MBUFS(sc, clsize); 3010 3011 KASSERT(sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS || 3012 sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3013 ("%s: too many rx mbufs %d for %d segments", __func__, 3014 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3015 3016 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3017 rxq = &sc->vtnet_rxqs[i]; 3018 3019 /* Hold the lock to satisfy asserts. */ 3020 VTNET_RXQ_LOCK(rxq); 3021 error = vtnet_rxq_populate(rxq); 3022 VTNET_RXQ_UNLOCK(rxq); 3023 3024 if (error) { 3025 device_printf(dev, 3026 "cannot allocate mbufs for Rx queue %d\n", i); 3027 return (error); 3028 } 3029 } 3030 3031 return (0); 3032 } 3033 3034 static int 3035 vtnet_init_tx_queues(struct vtnet_softc *sc) 3036 { 3037 struct vtnet_txq *txq; 3038 int i; 3039 3040 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3041 txq = &sc->vtnet_txqs[i]; 3042 txq->vtntx_watchdog = 0; 3043 #ifdef DEV_NETMAP 3044 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3045 #endif /* DEV_NETMAP */ 3046 } 3047 3048 return (0); 3049 } 3050 3051 static int 3052 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3053 { 3054 int error; 3055 3056 error = vtnet_init_rx_queues(sc); 3057 if (error) 3058 return (error); 3059 3060 error = vtnet_init_tx_queues(sc); 3061 if (error) 3062 return (error); 3063 3064 return (0); 3065 } 3066 3067 static void 3068 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3069 { 3070 device_t dev; 3071 int npairs; 3072 3073 dev = sc->vtnet_dev; 3074 3075 if ((sc->vtnet_flags & VTNET_FLAG_MULTIQ) == 0) { 3076 sc->vtnet_act_vq_pairs = 1; 3077 return; 3078 } 3079 3080 npairs = sc->vtnet_requested_vq_pairs; 3081 3082 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3083 device_printf(dev, 3084 "cannot set active queue pairs to %d\n", npairs); 3085 npairs = 1; 3086 } 3087 3088 sc->vtnet_act_vq_pairs = npairs; 3089 } 3090 3091 static int 3092 vtnet_reinit(struct vtnet_softc *sc) 3093 { 3094 struct ifnet *ifp; 3095 int error; 3096 3097 ifp = sc->vtnet_ifp; 3098 3099 /* Use the current MAC address. */ 3100 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3101 vtnet_set_hwaddr(sc); 3102 3103 vtnet_set_active_vq_pairs(sc); 3104 3105 ifp->if_hwassist = 0; 3106 if (ifp->if_capenable & IFCAP_TXCSUM) 3107 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3108 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3109 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3110 if (ifp->if_capenable & IFCAP_TSO4) 3111 ifp->if_hwassist |= CSUM_IP_TSO; 3112 if (ifp->if_capenable & IFCAP_TSO6) 3113 ifp->if_hwassist |= CSUM_IP6_TSO; 3114 3115 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3116 vtnet_init_rx_filters(sc); 3117 3118 error = vtnet_init_rxtx_queues(sc); 3119 if (error) 3120 return (error); 3121 3122 vtnet_enable_interrupts(sc); 3123 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3124 3125 return (0); 3126 } 3127 3128 static void 3129 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3130 { 3131 device_t dev; 3132 struct ifnet *ifp; 3133 3134 dev = sc->vtnet_dev; 3135 ifp = sc->vtnet_ifp; 3136 3137 VTNET_CORE_LOCK_ASSERT(sc); 3138 3139 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3140 return; 3141 3142 vtnet_stop(sc); 3143 3144 #ifdef DEV_NETMAP 3145 /* Once stopped we can update the netmap flags, if necessary. */ 3146 switch (init_mode) { 3147 case VTNET_INIT_NETMAP_ENTER: 3148 nm_set_native_flags(NA(ifp)); 3149 break; 3150 case VTNET_INIT_NETMAP_EXIT: 3151 nm_clear_native_flags(NA(ifp)); 3152 break; 3153 } 3154 #endif /* DEV_NETMAP */ 3155 3156 /* Reinitialize with the host. */ 3157 if (vtnet_virtio_reinit(sc) != 0) 3158 goto fail; 3159 3160 if (vtnet_reinit(sc) != 0) 3161 goto fail; 3162 3163 virtio_reinit_complete(dev); 3164 3165 vtnet_update_link_status(sc); 3166 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3167 3168 return; 3169 3170 fail: 3171 vtnet_stop(sc); 3172 } 3173 3174 static void 3175 vtnet_init(void *xsc) 3176 { 3177 struct vtnet_softc *sc; 3178 3179 sc = xsc; 3180 3181 VTNET_CORE_LOCK(sc); 3182 vtnet_init_locked(sc, 0); 3183 VTNET_CORE_UNLOCK(sc); 3184 } 3185 3186 static void 3187 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3188 { 3189 struct virtqueue *vq; 3190 3191 vq = sc->vtnet_ctrl_vq; 3192 3193 /* 3194 * The control virtqueue is only polled and therefore it should 3195 * already be empty. 3196 */ 3197 KASSERT(virtqueue_empty(vq), 3198 ("%s: ctrl vq %p not empty", __func__, vq)); 3199 } 3200 3201 static void 3202 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3203 struct sglist *sg, int readable, int writable) 3204 { 3205 struct virtqueue *vq; 3206 3207 vq = sc->vtnet_ctrl_vq; 3208 3209 VTNET_CORE_LOCK_ASSERT(sc); 3210 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ, 3211 ("%s: CTRL_VQ feature not negotiated", __func__)); 3212 3213 if (!virtqueue_empty(vq)) 3214 return; 3215 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0) 3216 return; 3217 3218 /* 3219 * Poll for the response, but the command is likely already 3220 * done when we return from the notify. 3221 */ 3222 virtqueue_notify(vq); 3223 virtqueue_poll(vq, NULL); 3224 } 3225 3226 static int 3227 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3228 { 3229 struct virtio_net_ctrl_hdr hdr __aligned(2); 3230 struct sglist_seg segs[3]; 3231 struct sglist sg; 3232 uint8_t ack; 3233 int error; 3234 3235 hdr.class = VIRTIO_NET_CTRL_MAC; 3236 hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3237 ack = VIRTIO_NET_ERR; 3238 3239 sglist_init(&sg, 3, segs); 3240 error = 0; 3241 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3242 error |= sglist_append(&sg, hwaddr, ETHER_ADDR_LEN); 3243 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3244 KASSERT(error == 0 && sg.sg_nseg == 3, 3245 ("%s: error %d adding set MAC msg to sglist", __func__, error)); 3246 3247 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3248 3249 return (ack == VIRTIO_NET_OK ? 0 : EIO); 3250 } 3251 3252 static int 3253 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3254 { 3255 struct sglist_seg segs[3]; 3256 struct sglist sg; 3257 struct { 3258 struct virtio_net_ctrl_hdr hdr; 3259 uint8_t pad1; 3260 struct virtio_net_ctrl_mq mq; 3261 uint8_t pad2; 3262 uint8_t ack; 3263 } s __aligned(2); 3264 int error; 3265 3266 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3267 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3268 s.mq.virtqueue_pairs = npairs; 3269 s.ack = VIRTIO_NET_ERR; 3270 3271 sglist_init(&sg, 3, segs); 3272 error = 0; 3273 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3274 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3275 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3276 KASSERT(error == 0 && sg.sg_nseg == 3, 3277 ("%s: error %d adding MQ message to sglist", __func__, error)); 3278 3279 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3280 3281 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3282 } 3283 3284 static int 3285 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on) 3286 { 3287 struct sglist_seg segs[3]; 3288 struct sglist sg; 3289 struct { 3290 struct virtio_net_ctrl_hdr hdr; 3291 uint8_t pad1; 3292 uint8_t onoff; 3293 uint8_t pad2; 3294 uint8_t ack; 3295 } s __aligned(2); 3296 int error; 3297 3298 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3299 ("%s: CTRL_RX feature not negotiated", __func__)); 3300 3301 s.hdr.class = VIRTIO_NET_CTRL_RX; 3302 s.hdr.cmd = cmd; 3303 s.onoff = !!on; 3304 s.ack = VIRTIO_NET_ERR; 3305 3306 sglist_init(&sg, 3, segs); 3307 error = 0; 3308 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3309 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3310 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3311 KASSERT(error == 0 && sg.sg_nseg == 3, 3312 ("%s: error %d adding Rx message to sglist", __func__, error)); 3313 3314 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3315 3316 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3317 } 3318 3319 static int 3320 vtnet_set_promisc(struct vtnet_softc *sc, int on) 3321 { 3322 3323 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3324 } 3325 3326 static int 3327 vtnet_set_allmulti(struct vtnet_softc *sc, int on) 3328 { 3329 3330 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3331 } 3332 3333 /* 3334 * The device defaults to promiscuous mode for backwards compatibility. 3335 * Turn it off at attach time if possible. 3336 */ 3337 static void 3338 vtnet_attach_disable_promisc(struct vtnet_softc *sc) 3339 { 3340 struct ifnet *ifp; 3341 3342 ifp = sc->vtnet_ifp; 3343 3344 VTNET_CORE_LOCK(sc); 3345 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) { 3346 ifp->if_flags |= IFF_PROMISC; 3347 } else if (vtnet_set_promisc(sc, 0) != 0) { 3348 ifp->if_flags |= IFF_PROMISC; 3349 device_printf(sc->vtnet_dev, 3350 "cannot disable default promiscuous mode\n"); 3351 } 3352 VTNET_CORE_UNLOCK(sc); 3353 } 3354 3355 static void 3356 vtnet_rx_filter(struct vtnet_softc *sc) 3357 { 3358 device_t dev; 3359 struct ifnet *ifp; 3360 3361 dev = sc->vtnet_dev; 3362 ifp = sc->vtnet_ifp; 3363 3364 VTNET_CORE_LOCK_ASSERT(sc); 3365 3366 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) 3367 device_printf(dev, "cannot %s promiscuous mode\n", 3368 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3369 3370 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) 3371 device_printf(dev, "cannot %s all-multicast mode\n", 3372 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3373 } 3374 3375 static u_int 3376 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3377 { 3378 struct vtnet_softc *sc = arg; 3379 3380 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3381 return (0); 3382 3383 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3384 bcopy(LLADDR(sdl), 3385 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3386 ETHER_ADDR_LEN); 3387 3388 return (1); 3389 } 3390 3391 static u_int 3392 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3393 { 3394 struct vtnet_mac_filter *filter = arg; 3395 3396 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3397 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3398 ETHER_ADDR_LEN); 3399 3400 return (1); 3401 } 3402 3403 static void 3404 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3405 { 3406 struct virtio_net_ctrl_hdr hdr __aligned(2); 3407 struct vtnet_mac_filter *filter; 3408 struct sglist_seg segs[4]; 3409 struct sglist sg; 3410 struct ifnet *ifp; 3411 bool promisc, allmulti; 3412 u_int ucnt, mcnt; 3413 int error; 3414 uint8_t ack; 3415 3416 ifp = sc->vtnet_ifp; 3417 filter = sc->vtnet_mac_filter; 3418 3419 VTNET_CORE_LOCK_ASSERT(sc); 3420 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 3421 ("%s: CTRL_RX feature not negotiated", __func__)); 3422 3423 /* Unicast MAC addresses: */ 3424 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3425 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3426 3427 if (promisc) { 3428 filter->vmf_unicast.nentries = 0; 3429 if_printf(ifp, "more than %d MAC addresses assigned, " 3430 "falling back to promiscuous mode\n", 3431 VTNET_MAX_MAC_ENTRIES); 3432 } else 3433 filter->vmf_unicast.nentries = ucnt; 3434 3435 /* Multicast MAC addresses: */ 3436 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3437 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3438 3439 if (allmulti) { 3440 filter->vmf_multicast.nentries = 0; 3441 if_printf(ifp, "more than %d multicast MAC addresses " 3442 "assigned, falling back to all-multicast mode\n", 3443 VTNET_MAX_MAC_ENTRIES); 3444 } else 3445 filter->vmf_multicast.nentries = mcnt; 3446 3447 if (promisc && allmulti) 3448 goto out; 3449 3450 hdr.class = VIRTIO_NET_CTRL_MAC; 3451 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3452 ack = VIRTIO_NET_ERR; 3453 3454 sglist_init(&sg, 4, segs); 3455 error = 0; 3456 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3457 error |= sglist_append(&sg, &filter->vmf_unicast, 3458 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN); 3459 error |= sglist_append(&sg, &filter->vmf_multicast, 3460 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN); 3461 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3462 KASSERT(error == 0 && sg.sg_nseg == 4, 3463 ("%s: error %d adding MAC filter msg to sglist", __func__, error)); 3464 3465 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3466 3467 if (ack != VIRTIO_NET_OK) 3468 if_printf(ifp, "error setting host MAC filter table\n"); 3469 3470 out: 3471 if (promisc != 0 && vtnet_set_promisc(sc, 1) != 0) 3472 if_printf(ifp, "cannot enable promiscuous mode\n"); 3473 if (allmulti != 0 && vtnet_set_allmulti(sc, 1) != 0) 3474 if_printf(ifp, "cannot enable all-multicast mode\n"); 3475 } 3476 3477 static int 3478 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3479 { 3480 struct sglist_seg segs[3]; 3481 struct sglist sg; 3482 struct { 3483 struct virtio_net_ctrl_hdr hdr; 3484 uint8_t pad1; 3485 uint16_t tag; 3486 uint8_t pad2; 3487 uint8_t ack; 3488 } s __aligned(2); 3489 int error; 3490 3491 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3492 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3493 s.tag = tag; 3494 s.ack = VIRTIO_NET_ERR; 3495 3496 sglist_init(&sg, 3, segs); 3497 error = 0; 3498 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3499 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3500 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3501 KASSERT(error == 0 && sg.sg_nseg == 3, 3502 ("%s: error %d adding VLAN message to sglist", __func__, error)); 3503 3504 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3505 3506 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3507 } 3508 3509 static void 3510 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3511 { 3512 uint32_t w; 3513 uint16_t tag; 3514 int i, bit; 3515 3516 VTNET_CORE_LOCK_ASSERT(sc); 3517 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 3518 ("%s: VLAN_FILTER feature not negotiated", __func__)); 3519 3520 /* Enable the filter for each configured VLAN. */ 3521 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3522 w = sc->vtnet_vlan_filter[i]; 3523 3524 while ((bit = ffs(w) - 1) != -1) { 3525 w &= ~(1 << bit); 3526 tag = sizeof(w) * CHAR_BIT * i + bit; 3527 3528 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3529 device_printf(sc->vtnet_dev, 3530 "cannot enable VLAN %d filter\n", tag); 3531 } 3532 } 3533 } 3534 } 3535 3536 static void 3537 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3538 { 3539 struct ifnet *ifp; 3540 int idx, bit; 3541 3542 ifp = sc->vtnet_ifp; 3543 idx = (tag >> 5) & 0x7F; 3544 bit = tag & 0x1F; 3545 3546 if (tag == 0 || tag > 4095) 3547 return; 3548 3549 VTNET_CORE_LOCK(sc); 3550 3551 if (add) 3552 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3553 else 3554 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3555 3556 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3557 ifp->if_drv_flags & IFF_DRV_RUNNING && 3558 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3559 device_printf(sc->vtnet_dev, 3560 "cannot %s VLAN %d %s the host filter table\n", 3561 add ? "add" : "remove", tag, add ? "to" : "from"); 3562 } 3563 3564 VTNET_CORE_UNLOCK(sc); 3565 } 3566 3567 static void 3568 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3569 { 3570 3571 if (ifp->if_softc != arg) 3572 return; 3573 3574 vtnet_update_vlan_filter(arg, 1, tag); 3575 } 3576 3577 static void 3578 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3579 { 3580 3581 if (ifp->if_softc != arg) 3582 return; 3583 3584 vtnet_update_vlan_filter(arg, 0, tag); 3585 } 3586 3587 static int 3588 vtnet_is_link_up(struct vtnet_softc *sc) 3589 { 3590 device_t dev; 3591 struct ifnet *ifp; 3592 uint16_t status; 3593 3594 dev = sc->vtnet_dev; 3595 ifp = sc->vtnet_ifp; 3596 3597 if ((ifp->if_capabilities & IFCAP_LINKSTATE) == 0) 3598 status = VIRTIO_NET_S_LINK_UP; 3599 else 3600 status = virtio_read_dev_config_2(dev, 3601 offsetof(struct virtio_net_config, status)); 3602 3603 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3604 } 3605 3606 static void 3607 vtnet_update_link_status(struct vtnet_softc *sc) 3608 { 3609 struct ifnet *ifp; 3610 int link; 3611 3612 ifp = sc->vtnet_ifp; 3613 3614 VTNET_CORE_LOCK_ASSERT(sc); 3615 link = vtnet_is_link_up(sc); 3616 3617 /* Notify if the link status has changed. */ 3618 if (link != 0 && sc->vtnet_link_active == 0) { 3619 sc->vtnet_link_active = 1; 3620 if_link_state_change(ifp, LINK_STATE_UP); 3621 } else if (link == 0 && sc->vtnet_link_active != 0) { 3622 sc->vtnet_link_active = 0; 3623 if_link_state_change(ifp, LINK_STATE_DOWN); 3624 } 3625 } 3626 3627 static int 3628 vtnet_ifmedia_upd(struct ifnet *ifp) 3629 { 3630 struct vtnet_softc *sc; 3631 struct ifmedia *ifm; 3632 3633 sc = ifp->if_softc; 3634 ifm = &sc->vtnet_media; 3635 3636 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) 3637 return (EINVAL); 3638 3639 return (0); 3640 } 3641 3642 static void 3643 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3644 { 3645 struct vtnet_softc *sc; 3646 3647 sc = ifp->if_softc; 3648 3649 ifmr->ifm_status = IFM_AVALID; 3650 ifmr->ifm_active = IFM_ETHER; 3651 3652 VTNET_CORE_LOCK(sc); 3653 if (vtnet_is_link_up(sc) != 0) { 3654 ifmr->ifm_status |= IFM_ACTIVE; 3655 ifmr->ifm_active |= VTNET_MEDIATYPE; 3656 } else 3657 ifmr->ifm_active |= IFM_NONE; 3658 VTNET_CORE_UNLOCK(sc); 3659 } 3660 3661 static void 3662 vtnet_set_hwaddr(struct vtnet_softc *sc) 3663 { 3664 device_t dev; 3665 int i; 3666 3667 dev = sc->vtnet_dev; 3668 3669 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 3670 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0) 3671 device_printf(dev, "unable to set MAC address\n"); 3672 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3673 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3674 virtio_write_dev_config_1(dev, 3675 offsetof(struct virtio_net_config, mac) + i, 3676 sc->vtnet_hwaddr[i]); 3677 } 3678 } 3679 } 3680 3681 static void 3682 vtnet_get_hwaddr(struct vtnet_softc *sc) 3683 { 3684 device_t dev; 3685 int i; 3686 3687 dev = sc->vtnet_dev; 3688 3689 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) { 3690 /* 3691 * Generate a random locally administered unicast address. 3692 * 3693 * It would be nice to generate the same MAC address across 3694 * reboots, but it seems all the hosts currently available 3695 * support the MAC feature, so this isn't too important. 3696 */ 3697 sc->vtnet_hwaddr[0] = 0xB2; 3698 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3699 vtnet_set_hwaddr(sc); 3700 return; 3701 } 3702 3703 for (i = 0; i < ETHER_ADDR_LEN; i++) { 3704 sc->vtnet_hwaddr[i] = virtio_read_dev_config_1(dev, 3705 offsetof(struct virtio_net_config, mac) + i); 3706 } 3707 } 3708 3709 static void 3710 vtnet_vlan_tag_remove(struct mbuf *m) 3711 { 3712 struct ether_vlan_header *evh; 3713 3714 evh = mtod(m, struct ether_vlan_header *); 3715 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 3716 m->m_flags |= M_VLANTAG; 3717 3718 /* Strip the 802.1Q header. */ 3719 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 3720 ETHER_HDR_LEN - ETHER_TYPE_LEN); 3721 m_adj(m, ETHER_VLAN_ENCAP_LEN); 3722 } 3723 3724 static void 3725 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 3726 { 3727 int limit; 3728 3729 limit = vtnet_tunable_int(sc, "rx_process_limit", 3730 vtnet_rx_process_limit); 3731 if (limit < 0) 3732 limit = INT_MAX; 3733 sc->vtnet_rx_process_limit = limit; 3734 } 3735 3736 static void 3737 vtnet_set_tx_intr_threshold(struct vtnet_softc *sc) 3738 { 3739 int size, thresh; 3740 3741 size = virtqueue_size(sc->vtnet_txqs[0].vtntx_vq); 3742 3743 /* 3744 * The Tx interrupt is disabled until the queue free count falls 3745 * below our threshold. Completed frames are drained from the Tx 3746 * virtqueue before transmitting new frames and in the watchdog 3747 * callout, so the frequency of Tx interrupts is greatly reduced, 3748 * at the cost of not freeing mbufs as quickly as they otherwise 3749 * would be. 3750 * 3751 * N.B. We assume all the Tx queues are the same size. 3752 */ 3753 thresh = size / 4; 3754 3755 /* 3756 * Without indirect descriptors, leave enough room for the most 3757 * segments we handle. 3758 */ 3759 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 3760 thresh < sc->vtnet_tx_nsegs) 3761 thresh = sc->vtnet_tx_nsegs; 3762 3763 sc->vtnet_tx_intr_thresh = thresh; 3764 } 3765 3766 static void 3767 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 3768 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 3769 { 3770 struct sysctl_oid *node; 3771 struct sysctl_oid_list *list; 3772 struct vtnet_rxq_stats *stats; 3773 char namebuf[16]; 3774 3775 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 3776 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3777 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 3778 list = SYSCTL_CHILDREN(node); 3779 3780 stats = &rxq->vtnrx_stats; 3781 3782 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 3783 &stats->vrxs_ipackets, "Receive packets"); 3784 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 3785 &stats->vrxs_ibytes, "Receive bytes"); 3786 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 3787 &stats->vrxs_iqdrops, "Receive drops"); 3788 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 3789 &stats->vrxs_ierrors, "Receive errors"); 3790 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3791 &stats->vrxs_csum, "Receive checksum offloaded"); 3792 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 3793 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 3794 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3795 &stats->vrxs_rescheduled, 3796 "Receive interrupt handler rescheduled"); 3797 } 3798 3799 static void 3800 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 3801 struct sysctl_oid_list *child, struct vtnet_txq *txq) 3802 { 3803 struct sysctl_oid *node; 3804 struct sysctl_oid_list *list; 3805 struct vtnet_txq_stats *stats; 3806 char namebuf[16]; 3807 3808 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 3809 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 3810 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 3811 list = SYSCTL_CHILDREN(node); 3812 3813 stats = &txq->vtntx_stats; 3814 3815 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 3816 &stats->vtxs_opackets, "Transmit packets"); 3817 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 3818 &stats->vtxs_obytes, "Transmit bytes"); 3819 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 3820 &stats->vtxs_omcasts, "Transmit multicasts"); 3821 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 3822 &stats->vtxs_csum, "Transmit checksum offloaded"); 3823 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 3824 &stats->vtxs_tso, "Transmit segmentation offloaded"); 3825 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 3826 &stats->vtxs_rescheduled, 3827 "Transmit interrupt handler rescheduled"); 3828 } 3829 3830 static void 3831 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 3832 { 3833 device_t dev; 3834 struct sysctl_ctx_list *ctx; 3835 struct sysctl_oid *tree; 3836 struct sysctl_oid_list *child; 3837 int i; 3838 3839 dev = sc->vtnet_dev; 3840 ctx = device_get_sysctl_ctx(dev); 3841 tree = device_get_sysctl_tree(dev); 3842 child = SYSCTL_CHILDREN(tree); 3843 3844 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3845 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 3846 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 3847 } 3848 } 3849 3850 static void 3851 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 3852 struct sysctl_oid_list *child, struct vtnet_softc *sc) 3853 { 3854 struct vtnet_statistics *stats; 3855 struct vtnet_rxq_stats rxaccum; 3856 struct vtnet_txq_stats txaccum; 3857 3858 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3859 3860 stats = &sc->vtnet_stats; 3861 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 3862 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 3863 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 3864 stats->tx_csum_offloaded = txaccum.vtxs_csum; 3865 stats->tx_tso_offloaded = txaccum.vtxs_tso; 3866 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 3867 3868 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 3869 CTLFLAG_RD, &stats->mbuf_alloc_failed, 3870 "Mbuf cluster allocation failures"); 3871 3872 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 3873 CTLFLAG_RD, &stats->rx_frame_too_large, 3874 "Received frame larger than the mbuf chain"); 3875 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 3876 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 3877 "Enqueuing the replacement receive mbuf failed"); 3878 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 3879 CTLFLAG_RD, &stats->rx_mergeable_failed, 3880 "Mergeable buffers receive failures"); 3881 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 3882 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 3883 "Received checksum offloaded buffer with unsupported " 3884 "Ethernet type"); 3885 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 3886 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 3887 "Received checksum offloaded buffer with incorrect IP protocol"); 3888 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 3889 CTLFLAG_RD, &stats->rx_csum_bad_offset, 3890 "Received checksum offloaded buffer with incorrect offset"); 3891 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 3892 CTLFLAG_RD, &stats->rx_csum_bad_proto, 3893 "Received checksum offloaded buffer with incorrect protocol"); 3894 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 3895 CTLFLAG_RD, &stats->rx_csum_failed, 3896 "Received buffer checksum offload failed"); 3897 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 3898 CTLFLAG_RD, &stats->rx_csum_offloaded, 3899 "Received buffer checksum offload succeeded"); 3900 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 3901 CTLFLAG_RD, &stats->rx_task_rescheduled, 3902 "Times the receive interrupt task rescheduled itself"); 3903 3904 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_bad_ethtype", 3905 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 3906 "Aborted transmit of checksum offloaded buffer with unknown " 3907 "Ethernet type"); 3908 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_bad_ethtype", 3909 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 3910 "Aborted transmit of TSO buffer with unknown Ethernet type"); 3911 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 3912 CTLFLAG_RD, &stats->tx_tso_not_tcp, 3913 "Aborted transmit of TSO buffer with non TCP protocol"); 3914 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 3915 CTLFLAG_RD, &stats->tx_defragged, 3916 "Transmit mbufs defragged"); 3917 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 3918 CTLFLAG_RD, &stats->tx_defrag_failed, 3919 "Aborted transmit of buffer because defrag failed"); 3920 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 3921 CTLFLAG_RD, &stats->tx_csum_offloaded, 3922 "Offloaded checksum of transmitted buffer"); 3923 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 3924 CTLFLAG_RD, &stats->tx_tso_offloaded, 3925 "Segmentation offload of transmitted buffer"); 3926 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 3927 CTLFLAG_RD, &stats->tx_task_rescheduled, 3928 "Times the transmit interrupt task rescheduled itself"); 3929 } 3930 3931 static void 3932 vtnet_setup_sysctl(struct vtnet_softc *sc) 3933 { 3934 device_t dev; 3935 struct sysctl_ctx_list *ctx; 3936 struct sysctl_oid *tree; 3937 struct sysctl_oid_list *child; 3938 3939 dev = sc->vtnet_dev; 3940 ctx = device_get_sysctl_ctx(dev); 3941 tree = device_get_sysctl_tree(dev); 3942 child = SYSCTL_CHILDREN(tree); 3943 3944 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 3945 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 3946 "Maximum number of supported virtqueue pairs"); 3947 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "requested_vq_pairs", 3948 CTLFLAG_RD, &sc->vtnet_requested_vq_pairs, 0, 3949 "Requested number of virtqueue pairs"); 3950 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 3951 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 3952 "Number of active virtqueue pairs"); 3953 3954 vtnet_setup_stat_sysctl(ctx, child, sc); 3955 } 3956 3957 static int 3958 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 3959 { 3960 3961 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 3962 } 3963 3964 static void 3965 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 3966 { 3967 3968 virtqueue_disable_intr(rxq->vtnrx_vq); 3969 } 3970 3971 static int 3972 vtnet_txq_enable_intr(struct vtnet_txq *txq) 3973 { 3974 struct virtqueue *vq; 3975 3976 vq = txq->vtntx_vq; 3977 3978 if (vtnet_txq_below_threshold(txq) != 0) 3979 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 3980 3981 /* 3982 * The free count is above our threshold. Keep the Tx interrupt 3983 * disabled until the queue is fuller. 3984 */ 3985 return (0); 3986 } 3987 3988 static void 3989 vtnet_txq_disable_intr(struct vtnet_txq *txq) 3990 { 3991 3992 virtqueue_disable_intr(txq->vtntx_vq); 3993 } 3994 3995 static void 3996 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 3997 { 3998 int i; 3999 4000 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4001 vtnet_rxq_enable_intr(&sc->vtnet_rxqs[i]); 4002 } 4003 4004 static void 4005 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4006 { 4007 int i; 4008 4009 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4010 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4011 } 4012 4013 static void 4014 vtnet_enable_interrupts(struct vtnet_softc *sc) 4015 { 4016 4017 vtnet_enable_rx_interrupts(sc); 4018 vtnet_enable_tx_interrupts(sc); 4019 } 4020 4021 static void 4022 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4023 { 4024 int i; 4025 4026 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4027 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4028 } 4029 4030 static void 4031 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4032 { 4033 int i; 4034 4035 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4036 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4037 } 4038 4039 static void 4040 vtnet_disable_interrupts(struct vtnet_softc *sc) 4041 { 4042 4043 vtnet_disable_rx_interrupts(sc); 4044 vtnet_disable_tx_interrupts(sc); 4045 } 4046 4047 static int 4048 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4049 { 4050 char path[64]; 4051 4052 snprintf(path, sizeof(path), 4053 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4054 TUNABLE_INT_FETCH(path, &def); 4055 4056 return (def); 4057 } 4058 4059 #ifdef DEBUGNET 4060 static void 4061 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4062 { 4063 struct vtnet_softc *sc; 4064 4065 sc = if_getsoftc(ifp); 4066 4067 VTNET_CORE_LOCK(sc); 4068 *nrxr = sc->vtnet_max_vq_pairs; 4069 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4070 *clsize = sc->vtnet_rx_clsize; 4071 VTNET_CORE_UNLOCK(sc); 4072 } 4073 4074 static void 4075 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4076 { 4077 } 4078 4079 static int 4080 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4081 { 4082 struct vtnet_softc *sc; 4083 struct vtnet_txq *txq; 4084 int error; 4085 4086 sc = if_getsoftc(ifp); 4087 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4088 IFF_DRV_RUNNING) 4089 return (EBUSY); 4090 4091 txq = &sc->vtnet_txqs[0]; 4092 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4093 if (error == 0) 4094 (void)vtnet_txq_notify(txq); 4095 return (error); 4096 } 4097 4098 static int 4099 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4100 { 4101 struct vtnet_softc *sc; 4102 int i; 4103 4104 sc = if_getsoftc(ifp); 4105 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4106 IFF_DRV_RUNNING) 4107 return (EBUSY); 4108 4109 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4110 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4111 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4112 return (0); 4113 } 4114 #endif /* DEBUGNET */ 4115