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/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/module.h> 42 #include <sys/msan.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/random.h> 46 #include <sys/sglist.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/taskqueue.h> 50 #include <sys/smp.h> 51 #include <machine/smp.h> 52 53 #include <vm/uma.h> 54 55 #include <net/debugnet.h> 56 #include <net/ethernet.h> 57 #include <net/pfil.h> 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_arp.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_media.h> 64 #include <net/if_vlan_var.h> 65 66 #include <net/bpf.h> 67 68 #include <netinet/in_systm.h> 69 #include <netinet/in.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip6.h> 72 #include <netinet6/ip6_var.h> 73 #include <netinet/udp.h> 74 #include <netinet/tcp.h> 75 #include <netinet/tcp_lro.h> 76 77 #include <machine/bus.h> 78 #include <machine/resource.h> 79 #include <sys/bus.h> 80 #include <sys/rman.h> 81 82 #include <dev/virtio/virtio.h> 83 #include <dev/virtio/virtqueue.h> 84 #include <dev/virtio/network/virtio_net.h> 85 #include <dev/virtio/network/if_vtnetvar.h> 86 #include "virtio_if.h" 87 88 #include "opt_inet.h" 89 #include "opt_inet6.h" 90 91 #if defined(INET) || defined(INET6) 92 #include <machine/in_cksum.h> 93 #endif 94 95 static int vtnet_modevent(module_t, int, void *); 96 97 static int vtnet_probe(device_t); 98 static int vtnet_attach(device_t); 99 static int vtnet_detach(device_t); 100 static int vtnet_suspend(device_t); 101 static int vtnet_resume(device_t); 102 static int vtnet_shutdown(device_t); 103 static int vtnet_attach_completed(device_t); 104 static int vtnet_config_change(device_t); 105 106 static int vtnet_negotiate_features(struct vtnet_softc *); 107 static int vtnet_setup_features(struct vtnet_softc *); 108 static int vtnet_init_rxq(struct vtnet_softc *, int); 109 static int vtnet_init_txq(struct vtnet_softc *, int); 110 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 111 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 112 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 113 static void vtnet_free_rx_filters(struct vtnet_softc *); 114 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 115 static int vtnet_alloc_interface(struct vtnet_softc *); 116 static int vtnet_setup_interface(struct vtnet_softc *); 117 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 118 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 119 static int vtnet_ioctl_multi(struct vtnet_softc *); 120 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 121 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 122 static uint64_t vtnet_get_counter(struct ifnet *, ift_counter); 123 124 static int vtnet_rxq_populate(struct vtnet_rxq *); 125 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 126 static struct mbuf * 127 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 128 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 129 struct mbuf *, int); 130 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 131 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 132 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 133 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 134 uint16_t, int, struct virtio_net_hdr *); 135 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 136 uint16_t, int, struct virtio_net_hdr *); 137 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 138 struct virtio_net_hdr *); 139 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 140 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 141 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 142 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 143 struct virtio_net_hdr *); 144 static int vtnet_rxq_eof(struct vtnet_rxq *); 145 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 146 static void vtnet_rx_vq_intr(void *); 147 static void vtnet_rxq_tq_intr(void *, int); 148 149 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 150 static int vtnet_txq_below_threshold(struct vtnet_txq *); 151 static int vtnet_txq_notify(struct vtnet_txq *); 152 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 153 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 154 int *, int *, int *); 155 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 156 int, struct virtio_net_hdr *); 157 static struct mbuf * 158 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 159 struct virtio_net_hdr *); 160 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 161 struct vtnet_tx_header *); 162 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 163 #ifdef VTNET_LEGACY_TX 164 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 165 static void vtnet_start(struct ifnet *); 166 #else 167 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 168 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 169 static void vtnet_txq_tq_deferred(void *, int); 170 #endif 171 static void vtnet_txq_start(struct vtnet_txq *); 172 static void vtnet_txq_tq_intr(void *, int); 173 static int vtnet_txq_eof(struct vtnet_txq *); 174 static void vtnet_tx_vq_intr(void *); 175 static void vtnet_tx_start_all(struct vtnet_softc *); 176 177 #ifndef VTNET_LEGACY_TX 178 static void vtnet_qflush(struct ifnet *); 179 #endif 180 181 static int vtnet_watchdog(struct vtnet_txq *); 182 static void vtnet_accum_stats(struct vtnet_softc *, 183 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 184 static void vtnet_tick(void *); 185 186 static void vtnet_start_taskqueues(struct vtnet_softc *); 187 static void vtnet_free_taskqueues(struct vtnet_softc *); 188 static void vtnet_drain_taskqueues(struct vtnet_softc *); 189 190 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 191 static void vtnet_stop_rendezvous(struct vtnet_softc *); 192 static void vtnet_stop(struct vtnet_softc *); 193 static int vtnet_virtio_reinit(struct vtnet_softc *); 194 static void vtnet_init_rx_filters(struct vtnet_softc *); 195 static int vtnet_init_rx_queues(struct vtnet_softc *); 196 static int vtnet_init_tx_queues(struct vtnet_softc *); 197 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 198 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 199 static void vtnet_update_rx_offloads(struct vtnet_softc *); 200 static int vtnet_reinit(struct vtnet_softc *); 201 static void vtnet_init_locked(struct vtnet_softc *, int); 202 static void vtnet_init(void *); 203 204 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 205 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 206 struct sglist *, int, int); 207 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 208 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 209 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 210 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 211 static int vtnet_set_promisc(struct vtnet_softc *, bool); 212 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 213 static void vtnet_rx_filter(struct vtnet_softc *); 214 static void vtnet_rx_filter_mac(struct vtnet_softc *); 215 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 216 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 217 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 218 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 219 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 220 221 static void vtnet_update_speed_duplex(struct vtnet_softc *); 222 static int vtnet_is_link_up(struct vtnet_softc *); 223 static void vtnet_update_link_status(struct vtnet_softc *); 224 static int vtnet_ifmedia_upd(struct ifnet *); 225 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 226 static void vtnet_get_macaddr(struct vtnet_softc *); 227 static void vtnet_set_macaddr(struct vtnet_softc *); 228 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 229 static void vtnet_vlan_tag_remove(struct mbuf *); 230 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 231 232 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 233 struct sysctl_oid_list *, struct vtnet_rxq *); 234 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 235 struct sysctl_oid_list *, struct vtnet_txq *); 236 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 237 static void vtnet_load_tunables(struct vtnet_softc *); 238 static void vtnet_setup_sysctl(struct vtnet_softc *); 239 240 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 241 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 242 static int vtnet_txq_enable_intr(struct vtnet_txq *); 243 static void vtnet_txq_disable_intr(struct vtnet_txq *); 244 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 245 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 246 static void vtnet_enable_interrupts(struct vtnet_softc *); 247 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 248 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 249 static void vtnet_disable_interrupts(struct vtnet_softc *); 250 251 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 252 253 DEBUGNET_DEFINE(vtnet); 254 255 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 256 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 257 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 258 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 259 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 260 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 261 262 /* Tunables. */ 263 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 264 "VirtIO Net driver parameters"); 265 266 static int vtnet_csum_disable = 0; 267 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 268 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 269 270 static int vtnet_fixup_needs_csum = 0; 271 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 272 &vtnet_fixup_needs_csum, 0, 273 "Calculate valid checksum for NEEDS_CSUM packets"); 274 275 static int vtnet_tso_disable = 0; 276 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 277 &vtnet_tso_disable, 0, "Disables TSO"); 278 279 static int vtnet_lro_disable = 0; 280 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 281 &vtnet_lro_disable, 0, "Disables hardware LRO"); 282 283 static int vtnet_mq_disable = 0; 284 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 285 &vtnet_mq_disable, 0, "Disables multiqueue support"); 286 287 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 288 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 289 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 290 291 static int vtnet_tso_maxlen = IP_MAXPACKET; 292 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 293 &vtnet_tso_maxlen, 0, "TSO burst limit"); 294 295 static int vtnet_rx_process_limit = 1024; 296 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 297 &vtnet_rx_process_limit, 0, 298 "Number of RX segments processed in one pass"); 299 300 static int vtnet_lro_entry_count = 128; 301 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 302 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 303 304 /* Enable sorted LRO, and the depth of the mbuf queue. */ 305 static int vtnet_lro_mbufq_depth = 0; 306 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 307 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 308 309 static uma_zone_t vtnet_tx_header_zone; 310 311 static struct virtio_feature_desc vtnet_feature_desc[] = { 312 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 313 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 314 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 315 { VIRTIO_NET_F_MAC, "MAC" }, 316 { VIRTIO_NET_F_GSO, "TxGSO" }, 317 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 318 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 319 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 320 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 321 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 322 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 323 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 324 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 325 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 326 { VIRTIO_NET_F_STATUS, "Status" }, 327 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 328 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 329 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 330 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 331 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 332 { VIRTIO_NET_F_MQ, "Multiqueue" }, 333 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 334 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 335 336 { 0, NULL } 337 }; 338 339 static device_method_t vtnet_methods[] = { 340 /* Device methods. */ 341 DEVMETHOD(device_probe, vtnet_probe), 342 DEVMETHOD(device_attach, vtnet_attach), 343 DEVMETHOD(device_detach, vtnet_detach), 344 DEVMETHOD(device_suspend, vtnet_suspend), 345 DEVMETHOD(device_resume, vtnet_resume), 346 DEVMETHOD(device_shutdown, vtnet_shutdown), 347 348 /* VirtIO methods. */ 349 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 350 DEVMETHOD(virtio_config_change, vtnet_config_change), 351 352 DEVMETHOD_END 353 }; 354 355 #ifdef DEV_NETMAP 356 #include <dev/netmap/if_vtnet_netmap.h> 357 #endif 358 359 static driver_t vtnet_driver = { 360 .name = "vtnet", 361 .methods = vtnet_methods, 362 .size = sizeof(struct vtnet_softc) 363 }; 364 static devclass_t vtnet_devclass; 365 366 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_devclass, 367 vtnet_modevent, 0); 368 MODULE_VERSION(vtnet, 1); 369 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 370 #ifdef DEV_NETMAP 371 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 372 #endif 373 374 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 375 376 static int 377 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 378 { 379 int error = 0; 380 static int loaded = 0; 381 382 switch (type) { 383 case MOD_LOAD: 384 if (loaded++ == 0) { 385 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 386 sizeof(struct vtnet_tx_header), 387 NULL, NULL, NULL, NULL, 0, 0); 388 #ifdef DEBUGNET 389 /* 390 * We need to allocate from this zone in the transmit path, so ensure 391 * that we have at least one item per header available. 392 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 393 * buckets 394 */ 395 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 396 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 397 #endif 398 } 399 break; 400 case MOD_QUIESCE: 401 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 402 error = EBUSY; 403 break; 404 case MOD_UNLOAD: 405 if (--loaded == 0) { 406 uma_zdestroy(vtnet_tx_header_zone); 407 vtnet_tx_header_zone = NULL; 408 } 409 break; 410 case MOD_SHUTDOWN: 411 break; 412 default: 413 error = EOPNOTSUPP; 414 break; 415 } 416 417 return (error); 418 } 419 420 static int 421 vtnet_probe(device_t dev) 422 { 423 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 424 } 425 426 static int 427 vtnet_attach(device_t dev) 428 { 429 struct vtnet_softc *sc; 430 int error; 431 432 sc = device_get_softc(dev); 433 sc->vtnet_dev = dev; 434 virtio_set_feature_desc(dev, vtnet_feature_desc); 435 436 VTNET_CORE_LOCK_INIT(sc); 437 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 438 vtnet_load_tunables(sc); 439 440 error = vtnet_alloc_interface(sc); 441 if (error) { 442 device_printf(dev, "cannot allocate interface\n"); 443 goto fail; 444 } 445 446 vtnet_setup_sysctl(sc); 447 448 error = vtnet_setup_features(sc); 449 if (error) { 450 device_printf(dev, "cannot setup features\n"); 451 goto fail; 452 } 453 454 error = vtnet_alloc_rx_filters(sc); 455 if (error) { 456 device_printf(dev, "cannot allocate Rx filters\n"); 457 goto fail; 458 } 459 460 error = vtnet_alloc_rxtx_queues(sc); 461 if (error) { 462 device_printf(dev, "cannot allocate queues\n"); 463 goto fail; 464 } 465 466 error = vtnet_alloc_virtqueues(sc); 467 if (error) { 468 device_printf(dev, "cannot allocate virtqueues\n"); 469 goto fail; 470 } 471 472 error = vtnet_setup_interface(sc); 473 if (error) { 474 device_printf(dev, "cannot setup interface\n"); 475 goto fail; 476 } 477 478 error = virtio_setup_intr(dev, INTR_TYPE_NET); 479 if (error) { 480 device_printf(dev, "cannot setup interrupts\n"); 481 ether_ifdetach(sc->vtnet_ifp); 482 goto fail; 483 } 484 485 #ifdef DEV_NETMAP 486 vtnet_netmap_attach(sc); 487 #endif 488 vtnet_start_taskqueues(sc); 489 490 fail: 491 if (error) 492 vtnet_detach(dev); 493 494 return (error); 495 } 496 497 static int 498 vtnet_detach(device_t dev) 499 { 500 struct vtnet_softc *sc; 501 struct ifnet *ifp; 502 503 sc = device_get_softc(dev); 504 ifp = sc->vtnet_ifp; 505 506 if (device_is_attached(dev)) { 507 VTNET_CORE_LOCK(sc); 508 vtnet_stop(sc); 509 VTNET_CORE_UNLOCK(sc); 510 511 callout_drain(&sc->vtnet_tick_ch); 512 vtnet_drain_taskqueues(sc); 513 514 ether_ifdetach(ifp); 515 } 516 517 #ifdef DEV_NETMAP 518 netmap_detach(ifp); 519 #endif 520 521 vtnet_free_taskqueues(sc); 522 523 if (sc->vtnet_vlan_attach != NULL) { 524 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 525 sc->vtnet_vlan_attach = NULL; 526 } 527 if (sc->vtnet_vlan_detach != NULL) { 528 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 529 sc->vtnet_vlan_detach = NULL; 530 } 531 532 ifmedia_removeall(&sc->vtnet_media); 533 534 if (ifp != NULL) { 535 if_free(ifp); 536 sc->vtnet_ifp = NULL; 537 } 538 539 vtnet_free_rxtx_queues(sc); 540 vtnet_free_rx_filters(sc); 541 542 if (sc->vtnet_ctrl_vq != NULL) 543 vtnet_free_ctrl_vq(sc); 544 545 VTNET_CORE_LOCK_DESTROY(sc); 546 547 return (0); 548 } 549 550 static int 551 vtnet_suspend(device_t dev) 552 { 553 struct vtnet_softc *sc; 554 555 sc = device_get_softc(dev); 556 557 VTNET_CORE_LOCK(sc); 558 vtnet_stop(sc); 559 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 560 VTNET_CORE_UNLOCK(sc); 561 562 return (0); 563 } 564 565 static int 566 vtnet_resume(device_t dev) 567 { 568 struct vtnet_softc *sc; 569 struct ifnet *ifp; 570 571 sc = device_get_softc(dev); 572 ifp = sc->vtnet_ifp; 573 574 VTNET_CORE_LOCK(sc); 575 if (ifp->if_flags & IFF_UP) 576 vtnet_init_locked(sc, 0); 577 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 578 VTNET_CORE_UNLOCK(sc); 579 580 return (0); 581 } 582 583 static int 584 vtnet_shutdown(device_t dev) 585 { 586 /* 587 * Suspend already does all of what we need to 588 * do here; we just never expect to be resumed. 589 */ 590 return (vtnet_suspend(dev)); 591 } 592 593 static int 594 vtnet_attach_completed(device_t dev) 595 { 596 struct vtnet_softc *sc; 597 598 sc = device_get_softc(dev); 599 600 VTNET_CORE_LOCK(sc); 601 vtnet_attached_set_macaddr(sc); 602 VTNET_CORE_UNLOCK(sc); 603 604 return (0); 605 } 606 607 static int 608 vtnet_config_change(device_t dev) 609 { 610 struct vtnet_softc *sc; 611 612 sc = device_get_softc(dev); 613 614 VTNET_CORE_LOCK(sc); 615 vtnet_update_link_status(sc); 616 if (sc->vtnet_link_active != 0) 617 vtnet_tx_start_all(sc); 618 VTNET_CORE_UNLOCK(sc); 619 620 return (0); 621 } 622 623 static int 624 vtnet_negotiate_features(struct vtnet_softc *sc) 625 { 626 device_t dev; 627 uint64_t features, negotiated_features; 628 int no_csum; 629 630 dev = sc->vtnet_dev; 631 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 632 VTNET_LEGACY_FEATURES; 633 634 /* 635 * TSO and LRO are only available when their corresponding checksum 636 * offload feature is also negotiated. 637 */ 638 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 639 if (no_csum) 640 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 641 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 642 features &= ~VTNET_TSO_FEATURES; 643 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 644 features &= ~VTNET_LRO_FEATURES; 645 646 #ifndef VTNET_LEGACY_TX 647 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 648 features &= ~VIRTIO_NET_F_MQ; 649 #else 650 features &= ~VIRTIO_NET_F_MQ; 651 #endif 652 653 negotiated_features = virtio_negotiate_features(dev, features); 654 655 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 656 uint16_t mtu; 657 658 mtu = virtio_read_dev_config_2(dev, 659 offsetof(struct virtio_net_config, mtu)); 660 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 661 device_printf(dev, "Invalid MTU value: %d. " 662 "MTU feature disabled.\n", mtu); 663 features &= ~VIRTIO_NET_F_MTU; 664 negotiated_features = 665 virtio_negotiate_features(dev, features); 666 } 667 } 668 669 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 670 uint16_t npairs; 671 672 npairs = virtio_read_dev_config_2(dev, 673 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 674 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 675 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 676 device_printf(dev, "Invalid max_virtqueue_pairs value: " 677 "%d. Multiqueue feature disabled.\n", npairs); 678 features &= ~VIRTIO_NET_F_MQ; 679 negotiated_features = 680 virtio_negotiate_features(dev, features); 681 } 682 } 683 684 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 685 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 686 /* 687 * LRO without mergeable buffers requires special care. This 688 * is not ideal because every receive buffer must be large 689 * enough to hold the maximum TCP packet, the Ethernet header, 690 * and the header. This requires up to 34 descriptors with 691 * MCLBYTES clusters. If we do not have indirect descriptors, 692 * LRO is disabled since the virtqueue will not contain very 693 * many receive buffers. 694 */ 695 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 696 device_printf(dev, 697 "Host LRO disabled since both mergeable buffers " 698 "and indirect descriptors were not negotiated\n"); 699 features &= ~VTNET_LRO_FEATURES; 700 negotiated_features = 701 virtio_negotiate_features(dev, features); 702 } else 703 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 704 } 705 706 sc->vtnet_features = negotiated_features; 707 sc->vtnet_negotiated_features = negotiated_features; 708 709 return (virtio_finalize_features(dev)); 710 } 711 712 static int 713 vtnet_setup_features(struct vtnet_softc *sc) 714 { 715 device_t dev; 716 int error; 717 718 dev = sc->vtnet_dev; 719 720 error = vtnet_negotiate_features(sc); 721 if (error) 722 return (error); 723 724 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 725 sc->vtnet_flags |= VTNET_FLAG_MODERN; 726 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 727 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 728 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 729 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 730 731 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 732 /* This feature should always be negotiated. */ 733 sc->vtnet_flags |= VTNET_FLAG_MAC; 734 } 735 736 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 737 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 738 offsetof(struct virtio_net_config, mtu)); 739 } else 740 sc->vtnet_max_mtu = VTNET_MAX_MTU; 741 742 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 743 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 744 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 745 } else if (vtnet_modern(sc)) { 746 /* This is identical to the mergeable header. */ 747 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 748 } else 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 750 751 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 752 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 753 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 754 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 755 else 756 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 757 758 /* 759 * Favor "hardware" LRO if negotiated, but support software LRO as 760 * a fallback; there is usually little benefit (or worse) with both. 761 */ 762 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 763 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 764 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 765 766 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 767 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 768 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 769 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 770 else 771 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 772 773 sc->vtnet_req_vq_pairs = 1; 774 sc->vtnet_max_vq_pairs = 1; 775 776 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 777 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 778 779 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 780 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 782 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 783 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 784 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 785 786 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 787 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 788 offsetof(struct virtio_net_config, 789 max_virtqueue_pairs)); 790 } 791 } 792 793 if (sc->vtnet_max_vq_pairs > 1) { 794 int req; 795 796 /* 797 * Limit the maximum number of requested queue pairs to the 798 * number of CPUs and the configured maximum. 799 */ 800 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 801 if (req < 0) 802 req = 1; 803 if (req == 0) 804 req = mp_ncpus; 805 if (req > sc->vtnet_max_vq_pairs) 806 req = sc->vtnet_max_vq_pairs; 807 if (req > mp_ncpus) 808 req = mp_ncpus; 809 if (req > 1) { 810 sc->vtnet_req_vq_pairs = req; 811 sc->vtnet_flags |= VTNET_FLAG_MQ; 812 } 813 } 814 815 return (0); 816 } 817 818 static int 819 vtnet_init_rxq(struct vtnet_softc *sc, int id) 820 { 821 struct vtnet_rxq *rxq; 822 823 rxq = &sc->vtnet_rxqs[id]; 824 825 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 826 device_get_nameunit(sc->vtnet_dev), id); 827 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 828 829 rxq->vtnrx_sc = sc; 830 rxq->vtnrx_id = id; 831 832 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 833 if (rxq->vtnrx_sg == NULL) 834 return (ENOMEM); 835 836 #if defined(INET) || defined(INET6) 837 if (vtnet_software_lro(sc)) { 838 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 839 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 840 return (ENOMEM); 841 } 842 #endif 843 844 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 845 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 846 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 847 848 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 849 } 850 851 static int 852 vtnet_init_txq(struct vtnet_softc *sc, int id) 853 { 854 struct vtnet_txq *txq; 855 856 txq = &sc->vtnet_txqs[id]; 857 858 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 859 device_get_nameunit(sc->vtnet_dev), id); 860 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 861 862 txq->vtntx_sc = sc; 863 txq->vtntx_id = id; 864 865 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 866 if (txq->vtntx_sg == NULL) 867 return (ENOMEM); 868 869 #ifndef VTNET_LEGACY_TX 870 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 871 M_NOWAIT, &txq->vtntx_mtx); 872 if (txq->vtntx_br == NULL) 873 return (ENOMEM); 874 875 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 876 #endif 877 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 878 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 879 taskqueue_thread_enqueue, &txq->vtntx_tq); 880 if (txq->vtntx_tq == NULL) 881 return (ENOMEM); 882 883 return (0); 884 } 885 886 static int 887 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 888 { 889 int i, npairs, error; 890 891 npairs = sc->vtnet_max_vq_pairs; 892 893 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 894 M_NOWAIT | M_ZERO); 895 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 896 M_NOWAIT | M_ZERO); 897 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 898 return (ENOMEM); 899 900 for (i = 0; i < npairs; i++) { 901 error = vtnet_init_rxq(sc, i); 902 if (error) 903 return (error); 904 error = vtnet_init_txq(sc, i); 905 if (error) 906 return (error); 907 } 908 909 vtnet_set_rx_process_limit(sc); 910 vtnet_setup_queue_sysctl(sc); 911 912 return (0); 913 } 914 915 static void 916 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 917 { 918 919 rxq->vtnrx_sc = NULL; 920 rxq->vtnrx_id = -1; 921 922 #if defined(INET) || defined(INET6) 923 tcp_lro_free(&rxq->vtnrx_lro); 924 #endif 925 926 if (rxq->vtnrx_sg != NULL) { 927 sglist_free(rxq->vtnrx_sg); 928 rxq->vtnrx_sg = NULL; 929 } 930 931 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 932 mtx_destroy(&rxq->vtnrx_mtx); 933 } 934 935 static void 936 vtnet_destroy_txq(struct vtnet_txq *txq) 937 { 938 939 txq->vtntx_sc = NULL; 940 txq->vtntx_id = -1; 941 942 if (txq->vtntx_sg != NULL) { 943 sglist_free(txq->vtntx_sg); 944 txq->vtntx_sg = NULL; 945 } 946 947 #ifndef VTNET_LEGACY_TX 948 if (txq->vtntx_br != NULL) { 949 buf_ring_free(txq->vtntx_br, M_DEVBUF); 950 txq->vtntx_br = NULL; 951 } 952 #endif 953 954 if (mtx_initialized(&txq->vtntx_mtx) != 0) 955 mtx_destroy(&txq->vtntx_mtx); 956 } 957 958 static void 959 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 960 { 961 int i; 962 963 if (sc->vtnet_rxqs != NULL) { 964 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 965 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 966 free(sc->vtnet_rxqs, M_DEVBUF); 967 sc->vtnet_rxqs = NULL; 968 } 969 970 if (sc->vtnet_txqs != NULL) { 971 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 972 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 973 free(sc->vtnet_txqs, M_DEVBUF); 974 sc->vtnet_txqs = NULL; 975 } 976 } 977 978 static int 979 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 980 { 981 982 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 983 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 984 M_DEVBUF, M_NOWAIT | M_ZERO); 985 if (sc->vtnet_mac_filter == NULL) 986 return (ENOMEM); 987 } 988 989 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 990 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 991 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 992 if (sc->vtnet_vlan_filter == NULL) 993 return (ENOMEM); 994 } 995 996 return (0); 997 } 998 999 static void 1000 vtnet_free_rx_filters(struct vtnet_softc *sc) 1001 { 1002 1003 if (sc->vtnet_mac_filter != NULL) { 1004 free(sc->vtnet_mac_filter, M_DEVBUF); 1005 sc->vtnet_mac_filter = NULL; 1006 } 1007 1008 if (sc->vtnet_vlan_filter != NULL) { 1009 free(sc->vtnet_vlan_filter, M_DEVBUF); 1010 sc->vtnet_vlan_filter = NULL; 1011 } 1012 } 1013 1014 static int 1015 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1016 { 1017 device_t dev; 1018 struct vq_alloc_info *info; 1019 struct vtnet_rxq *rxq; 1020 struct vtnet_txq *txq; 1021 int i, idx, flags, nvqs, error; 1022 1023 dev = sc->vtnet_dev; 1024 flags = 0; 1025 1026 nvqs = sc->vtnet_max_vq_pairs * 2; 1027 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1028 nvqs++; 1029 1030 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1031 if (info == NULL) 1032 return (ENOMEM); 1033 1034 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1035 rxq = &sc->vtnet_rxqs[i]; 1036 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1037 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1038 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1039 1040 txq = &sc->vtnet_txqs[i]; 1041 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1042 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1043 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1044 } 1045 1046 /* These queues will not be used so allocate the minimum resources. */ 1047 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1048 rxq = &sc->vtnet_rxqs[i]; 1049 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1050 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1051 1052 txq = &sc->vtnet_txqs[i]; 1053 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1054 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1055 } 1056 1057 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1058 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1059 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1060 } 1061 1062 /* 1063 * TODO: Enable interrupt binding if this is multiqueue. This will 1064 * only matter when per-virtqueue MSIX is available. 1065 */ 1066 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1067 flags |= 0; 1068 1069 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1070 free(info, M_TEMP); 1071 1072 return (error); 1073 } 1074 1075 static int 1076 vtnet_alloc_interface(struct vtnet_softc *sc) 1077 { 1078 device_t dev; 1079 struct ifnet *ifp; 1080 1081 dev = sc->vtnet_dev; 1082 1083 ifp = if_alloc(IFT_ETHER); 1084 if (ifp == NULL) 1085 return (ENOMEM); 1086 1087 sc->vtnet_ifp = ifp; 1088 ifp->if_softc = sc; 1089 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1090 1091 return (0); 1092 } 1093 1094 static int 1095 vtnet_setup_interface(struct vtnet_softc *sc) 1096 { 1097 device_t dev; 1098 struct pfil_head_args pa; 1099 struct ifnet *ifp; 1100 1101 dev = sc->vtnet_dev; 1102 ifp = sc->vtnet_ifp; 1103 1104 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST | 1105 IFF_KNOWSEPOCH; 1106 ifp->if_baudrate = IF_Gbps(10); 1107 ifp->if_init = vtnet_init; 1108 ifp->if_ioctl = vtnet_ioctl; 1109 ifp->if_get_counter = vtnet_get_counter; 1110 #ifndef VTNET_LEGACY_TX 1111 ifp->if_transmit = vtnet_txq_mq_start; 1112 ifp->if_qflush = vtnet_qflush; 1113 #else 1114 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1115 ifp->if_start = vtnet_start; 1116 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1); 1117 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1; 1118 IFQ_SET_READY(&ifp->if_snd); 1119 #endif 1120 1121 vtnet_get_macaddr(sc); 1122 1123 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1124 ifp->if_capabilities |= IFCAP_LINKSTATE; 1125 1126 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1127 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1128 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1129 1130 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1131 int gso; 1132 1133 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6; 1134 1135 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1136 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1137 ifp->if_capabilities |= IFCAP_TSO4; 1138 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1139 ifp->if_capabilities |= IFCAP_TSO6; 1140 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1141 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1142 1143 if (ifp->if_capabilities & (IFCAP_TSO4 | IFCAP_TSO6)) { 1144 int tso_maxlen; 1145 1146 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 1147 1148 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1149 vtnet_tso_maxlen); 1150 ifp->if_hw_tsomax = tso_maxlen - 1151 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN); 1152 ifp->if_hw_tsomaxsegcount = sc->vtnet_tx_nsegs - 1; 1153 ifp->if_hw_tsomaxsegsize = PAGE_SIZE; 1154 } 1155 } 1156 1157 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1158 ifp->if_capabilities |= IFCAP_RXCSUM; 1159 #ifdef notyet 1160 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1161 ifp->if_capabilities |= IFCAP_RXCSUM_IPV6; 1162 #endif 1163 1164 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1165 vtnet_fixup_needs_csum) != 0) 1166 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1167 1168 /* Support either "hardware" or software LRO. */ 1169 ifp->if_capabilities |= IFCAP_LRO; 1170 } 1171 1172 if (ifp->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1173 /* 1174 * VirtIO does not support VLAN tagging, but we can fake 1175 * it by inserting and removing the 802.1Q header during 1176 * transmit and receive. We are then able to do checksum 1177 * offloading of VLAN frames. 1178 */ 1179 ifp->if_capabilities |= 1180 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 1181 } 1182 1183 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1184 ifp->if_capabilities |= IFCAP_JUMBO_MTU; 1185 ifp->if_capabilities |= IFCAP_VLAN_MTU; 1186 1187 /* 1188 * Capabilities after here are not enabled by default. 1189 */ 1190 ifp->if_capenable = ifp->if_capabilities; 1191 1192 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1193 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 1194 1195 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1196 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1197 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1198 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1199 } 1200 1201 ether_ifattach(ifp, sc->vtnet_hwaddr); 1202 1203 /* Tell the upper layer(s) we support long frames. */ 1204 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 1205 1206 DEBUGNET_SET(ifp, vtnet); 1207 1208 pa.pa_version = PFIL_VERSION; 1209 pa.pa_flags = PFIL_IN; 1210 pa.pa_type = PFIL_TYPE_ETHERNET; 1211 pa.pa_headname = ifp->if_xname; 1212 sc->vtnet_pfil = pfil_head_register(&pa); 1213 1214 return (0); 1215 } 1216 1217 static int 1218 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1219 { 1220 int framesz; 1221 1222 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1223 return (MJUMPAGESIZE); 1224 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1225 return (MCLBYTES); 1226 1227 /* 1228 * Try to scale the receive mbuf cluster size from the MTU. We 1229 * could also use the VQ size to influence the selected size, 1230 * but that would only matter for very small queues. 1231 */ 1232 if (vtnet_modern(sc)) { 1233 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1234 framesz = sizeof(struct virtio_net_hdr_v1); 1235 } else 1236 framesz = sizeof(struct vtnet_rx_header); 1237 framesz += sizeof(struct ether_vlan_header) + mtu; 1238 1239 if (framesz <= MCLBYTES) 1240 return (MCLBYTES); 1241 else if (framesz <= MJUMPAGESIZE) 1242 return (MJUMPAGESIZE); 1243 else if (framesz <= MJUM9BYTES) 1244 return (MJUM9BYTES); 1245 1246 /* Sane default; avoid 16KB clusters. */ 1247 return (MCLBYTES); 1248 } 1249 1250 static int 1251 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1252 { 1253 struct ifnet *ifp; 1254 int clustersz; 1255 1256 ifp = sc->vtnet_ifp; 1257 VTNET_CORE_LOCK_ASSERT(sc); 1258 1259 if (ifp->if_mtu == mtu) 1260 return (0); 1261 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1262 return (EINVAL); 1263 1264 ifp->if_mtu = mtu; 1265 clustersz = vtnet_rx_cluster_size(sc, mtu); 1266 1267 if (clustersz != sc->vtnet_rx_clustersz && 1268 ifp->if_drv_flags & IFF_DRV_RUNNING) { 1269 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1270 vtnet_init_locked(sc, 0); 1271 } 1272 1273 return (0); 1274 } 1275 1276 static int 1277 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1278 { 1279 struct ifnet *ifp; 1280 int drv_running; 1281 1282 ifp = sc->vtnet_ifp; 1283 drv_running = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0; 1284 1285 VTNET_CORE_LOCK_ASSERT(sc); 1286 1287 if ((ifp->if_flags & IFF_UP) == 0) { 1288 if (drv_running) 1289 vtnet_stop(sc); 1290 goto out; 1291 } 1292 1293 if (!drv_running) { 1294 vtnet_init_locked(sc, 0); 1295 goto out; 1296 } 1297 1298 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 1299 (IFF_PROMISC | IFF_ALLMULTI)) { 1300 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 1301 return (ENOTSUP); 1302 vtnet_rx_filter(sc); 1303 } 1304 1305 out: 1306 sc->vtnet_if_flags = ifp->if_flags; 1307 return (0); 1308 } 1309 1310 static int 1311 vtnet_ioctl_multi(struct vtnet_softc *sc) 1312 { 1313 struct ifnet *ifp; 1314 1315 ifp = sc->vtnet_ifp; 1316 1317 VTNET_CORE_LOCK_ASSERT(sc); 1318 1319 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1320 ifp->if_drv_flags & IFF_DRV_RUNNING) 1321 vtnet_rx_filter_mac(sc); 1322 1323 return (0); 1324 } 1325 1326 static int 1327 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1328 { 1329 struct ifnet *ifp; 1330 int mask, reinit, update; 1331 1332 ifp = sc->vtnet_ifp; 1333 mask = (ifr->ifr_reqcap & ifp->if_capabilities) ^ ifp->if_capenable; 1334 reinit = update = 0; 1335 1336 VTNET_CORE_LOCK_ASSERT(sc); 1337 1338 if (mask & IFCAP_TXCSUM) 1339 ifp->if_capenable ^= IFCAP_TXCSUM; 1340 if (mask & IFCAP_TXCSUM_IPV6) 1341 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1342 if (mask & IFCAP_TSO4) 1343 ifp->if_capenable ^= IFCAP_TSO4; 1344 if (mask & IFCAP_TSO6) 1345 ifp->if_capenable ^= IFCAP_TSO6; 1346 1347 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1348 /* 1349 * These Rx features require the negotiated features to 1350 * be updated. Avoid a full reinit if possible. 1351 */ 1352 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1353 update = 1; 1354 else 1355 reinit = 1; 1356 1357 /* BMV: Avoid needless renegotiation for just software LRO. */ 1358 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1359 IFCAP_LRO && vtnet_software_lro(sc)) 1360 reinit = update = 0; 1361 1362 if (mask & IFCAP_RXCSUM) 1363 ifp->if_capenable ^= IFCAP_RXCSUM; 1364 if (mask & IFCAP_RXCSUM_IPV6) 1365 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1366 if (mask & IFCAP_LRO) 1367 ifp->if_capenable ^= IFCAP_LRO; 1368 1369 /* 1370 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1371 * so treat them as a pair. Guest TSO (LRO) requires receive 1372 * checksums. 1373 */ 1374 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1375 ifp->if_capenable |= IFCAP_RXCSUM; 1376 #ifdef notyet 1377 ifp->if_capenable |= IFCAP_RXCSUM_IPV6; 1378 #endif 1379 } else 1380 ifp->if_capenable &= 1381 ~(IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO); 1382 } 1383 1384 if (mask & IFCAP_VLAN_HWFILTER) { 1385 /* These Rx features require renegotiation. */ 1386 reinit = 1; 1387 1388 if (mask & IFCAP_VLAN_HWFILTER) 1389 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1390 } 1391 1392 if (mask & IFCAP_VLAN_HWTSO) 1393 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1394 if (mask & IFCAP_VLAN_HWTAGGING) 1395 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1396 1397 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1398 if (reinit) { 1399 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1400 vtnet_init_locked(sc, 0); 1401 } else if (update) 1402 vtnet_update_rx_offloads(sc); 1403 } 1404 1405 return (0); 1406 } 1407 1408 static int 1409 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1410 { 1411 struct vtnet_softc *sc; 1412 struct ifreq *ifr; 1413 int error; 1414 1415 sc = ifp->if_softc; 1416 ifr = (struct ifreq *) data; 1417 error = 0; 1418 1419 switch (cmd) { 1420 case SIOCSIFMTU: 1421 VTNET_CORE_LOCK(sc); 1422 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1423 VTNET_CORE_UNLOCK(sc); 1424 break; 1425 1426 case SIOCSIFFLAGS: 1427 VTNET_CORE_LOCK(sc); 1428 error = vtnet_ioctl_ifflags(sc); 1429 VTNET_CORE_UNLOCK(sc); 1430 break; 1431 1432 case SIOCADDMULTI: 1433 case SIOCDELMULTI: 1434 VTNET_CORE_LOCK(sc); 1435 error = vtnet_ioctl_multi(sc); 1436 VTNET_CORE_UNLOCK(sc); 1437 break; 1438 1439 case SIOCSIFMEDIA: 1440 case SIOCGIFMEDIA: 1441 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1442 break; 1443 1444 case SIOCSIFCAP: 1445 VTNET_CORE_LOCK(sc); 1446 error = vtnet_ioctl_ifcap(sc, ifr); 1447 VTNET_CORE_UNLOCK(sc); 1448 VLAN_CAPABILITIES(ifp); 1449 break; 1450 1451 default: 1452 error = ether_ioctl(ifp, cmd, data); 1453 break; 1454 } 1455 1456 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1457 1458 return (error); 1459 } 1460 1461 static int 1462 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1463 { 1464 struct virtqueue *vq; 1465 int nbufs, error; 1466 1467 #ifdef DEV_NETMAP 1468 error = vtnet_netmap_rxq_populate(rxq); 1469 if (error >= 0) 1470 return (error); 1471 #endif /* DEV_NETMAP */ 1472 1473 vq = rxq->vtnrx_vq; 1474 error = ENOSPC; 1475 1476 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1477 error = vtnet_rxq_new_buf(rxq); 1478 if (error) 1479 break; 1480 } 1481 1482 if (nbufs > 0) { 1483 virtqueue_notify(vq); 1484 /* 1485 * EMSGSIZE signifies the virtqueue did not have enough 1486 * entries available to hold the last mbuf. This is not 1487 * an error. 1488 */ 1489 if (error == EMSGSIZE) 1490 error = 0; 1491 } 1492 1493 return (error); 1494 } 1495 1496 static void 1497 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1498 { 1499 struct virtqueue *vq; 1500 struct mbuf *m; 1501 int last; 1502 #ifdef DEV_NETMAP 1503 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1504 rxq->vtnrx_id, NR_RX); 1505 #else /* !DEV_NETMAP */ 1506 void *kring = NULL; 1507 #endif /* !DEV_NETMAP */ 1508 1509 vq = rxq->vtnrx_vq; 1510 last = 0; 1511 1512 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1513 if (kring == NULL) 1514 m_freem(m); 1515 } 1516 1517 KASSERT(virtqueue_empty(vq), 1518 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1519 } 1520 1521 static struct mbuf * 1522 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1523 { 1524 struct mbuf *m_head, *m_tail, *m; 1525 int i, size; 1526 1527 m_head = NULL; 1528 size = sc->vtnet_rx_clustersz; 1529 1530 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1531 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1532 1533 for (i = 0; i < nbufs; i++) { 1534 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1535 if (m == NULL) { 1536 sc->vtnet_stats.mbuf_alloc_failed++; 1537 m_freem(m_head); 1538 return (NULL); 1539 } 1540 1541 m->m_len = size; 1542 if (m_head != NULL) { 1543 m_tail->m_next = m; 1544 m_tail = m; 1545 } else 1546 m_head = m_tail = m; 1547 } 1548 1549 if (m_tailp != NULL) 1550 *m_tailp = m_tail; 1551 1552 return (m_head); 1553 } 1554 1555 /* 1556 * Slow path for when LRO without mergeable buffers is negotiated. 1557 */ 1558 static int 1559 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1560 int len0) 1561 { 1562 struct vtnet_softc *sc; 1563 struct mbuf *m, *m_prev, *m_new, *m_tail; 1564 int len, clustersz, nreplace, error; 1565 1566 sc = rxq->vtnrx_sc; 1567 clustersz = sc->vtnet_rx_clustersz; 1568 1569 m_prev = NULL; 1570 m_tail = NULL; 1571 nreplace = 0; 1572 1573 m = m0; 1574 len = len0; 1575 1576 /* 1577 * Since these mbuf chains are so large, avoid allocating a complete 1578 * replacement when the received frame did not consume the entire 1579 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1580 */ 1581 while (len > 0) { 1582 if (m == NULL) { 1583 sc->vtnet_stats.rx_frame_too_large++; 1584 return (EMSGSIZE); 1585 } 1586 1587 /* 1588 * Every mbuf should have the expected cluster size since that 1589 * is also used to allocate the replacements. 1590 */ 1591 KASSERT(m->m_len == clustersz, 1592 ("%s: mbuf size %d not expected cluster size %d", __func__, 1593 m->m_len, clustersz)); 1594 1595 m->m_len = MIN(m->m_len, len); 1596 len -= m->m_len; 1597 1598 m_prev = m; 1599 m = m->m_next; 1600 nreplace++; 1601 } 1602 1603 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1604 ("%s: invalid replacement mbuf count %d max %d", __func__, 1605 nreplace, sc->vtnet_rx_nmbufs)); 1606 1607 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1608 if (m_new == NULL) { 1609 m_prev->m_len = clustersz; 1610 return (ENOBUFS); 1611 } 1612 1613 /* 1614 * Move any unused mbufs from the received mbuf chain onto the 1615 * end of the replacement chain. 1616 */ 1617 if (m_prev->m_next != NULL) { 1618 m_tail->m_next = m_prev->m_next; 1619 m_prev->m_next = NULL; 1620 } 1621 1622 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1623 if (error) { 1624 /* 1625 * The replacement is suppose to be an copy of the one 1626 * dequeued so this is a very unexpected error. 1627 * 1628 * Restore the m0 chain to the original state if it was 1629 * modified so we can then discard it. 1630 */ 1631 if (m_tail->m_next != NULL) { 1632 m_prev->m_next = m_tail->m_next; 1633 m_tail->m_next = NULL; 1634 } 1635 m_prev->m_len = clustersz; 1636 sc->vtnet_stats.rx_enq_replacement_failed++; 1637 m_freem(m_new); 1638 } 1639 1640 return (error); 1641 } 1642 1643 static int 1644 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1645 { 1646 struct vtnet_softc *sc; 1647 struct mbuf *m_new; 1648 int error; 1649 1650 sc = rxq->vtnrx_sc; 1651 1652 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1653 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1654 1655 MPASS(m->m_next == NULL); 1656 if (m->m_len < len) 1657 return (EMSGSIZE); 1658 1659 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1660 if (m_new == NULL) 1661 return (ENOBUFS); 1662 1663 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1664 if (error) { 1665 sc->vtnet_stats.rx_enq_replacement_failed++; 1666 m_freem(m_new); 1667 } else 1668 m->m_len = len; 1669 1670 return (error); 1671 } 1672 1673 static int 1674 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1675 { 1676 struct vtnet_softc *sc; 1677 struct sglist *sg; 1678 int header_inlined, error; 1679 1680 sc = rxq->vtnrx_sc; 1681 sg = rxq->vtnrx_sg; 1682 1683 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1684 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1685 VTNET_RXQ_LOCK_ASSERT(rxq); 1686 1687 sglist_reset(sg); 1688 header_inlined = vtnet_modern(sc) || 1689 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1690 1691 if (header_inlined) 1692 error = sglist_append_mbuf(sg, m); 1693 else { 1694 struct vtnet_rx_header *rxhdr = 1695 mtod(m, struct vtnet_rx_header *); 1696 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1697 1698 /* Append the header and remaining mbuf data. */ 1699 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1700 if (error) 1701 return (error); 1702 error = sglist_append(sg, &rxhdr[1], 1703 m->m_len - sizeof(struct vtnet_rx_header)); 1704 if (error) 1705 return (error); 1706 1707 if (m->m_next != NULL) 1708 error = sglist_append_mbuf(sg, m->m_next); 1709 } 1710 1711 if (error) 1712 return (error); 1713 1714 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1715 } 1716 1717 static int 1718 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1719 { 1720 struct vtnet_softc *sc; 1721 struct mbuf *m; 1722 int error; 1723 1724 sc = rxq->vtnrx_sc; 1725 1726 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1727 if (m == NULL) 1728 return (ENOBUFS); 1729 1730 error = vtnet_rxq_enqueue_buf(rxq, m); 1731 if (error) 1732 m_freem(m); 1733 1734 return (error); 1735 } 1736 1737 static int 1738 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1739 int hoff, struct virtio_net_hdr *hdr) 1740 { 1741 struct vtnet_softc *sc; 1742 int error; 1743 1744 sc = rxq->vtnrx_sc; 1745 1746 /* 1747 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1748 * not have an analogous CSUM flag. The checksum has been validated, 1749 * but is incomplete (TCP/UDP pseudo header). 1750 * 1751 * The packet is likely from another VM on the same host that itself 1752 * performed checksum offloading so Tx/Rx is basically a memcpy and 1753 * the checksum has little value. 1754 * 1755 * Default to receiving the packet as-is for performance reasons, but 1756 * this can cause issues if the packet is to be forwarded because it 1757 * does not contain a valid checksum. This patch may be helpful: 1758 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1759 * compute the checksum if requested. 1760 * 1761 * BMV: Need to add an CSUM_PARTIAL flag? 1762 */ 1763 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1764 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1765 return (error); 1766 } 1767 1768 /* 1769 * Compute the checksum in the driver so the packet will contain a 1770 * valid checksum. The checksum is at csum_offset from csum_start. 1771 */ 1772 switch (etype) { 1773 #if defined(INET) || defined(INET6) 1774 case ETHERTYPE_IP: 1775 case ETHERTYPE_IPV6: { 1776 int csum_off, csum_end; 1777 uint16_t csum; 1778 1779 csum_off = hdr->csum_start + hdr->csum_offset; 1780 csum_end = csum_off + sizeof(uint16_t); 1781 1782 /* Assume checksum will be in the first mbuf. */ 1783 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1784 return (1); 1785 1786 /* 1787 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1788 * checksum and write it at the specified offset. We could 1789 * try to verify the packet: csum_start should probably 1790 * correspond to the start of the TCP/UDP header. 1791 * 1792 * BMV: Need to properly handle UDP with zero checksum. Is 1793 * the IPv4 header checksum implicitly validated? 1794 */ 1795 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1796 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1797 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1798 m->m_pkthdr.csum_data = 0xFFFF; 1799 break; 1800 } 1801 #endif 1802 default: 1803 sc->vtnet_stats.rx_csum_bad_ethtype++; 1804 return (1); 1805 } 1806 1807 return (0); 1808 } 1809 1810 static int 1811 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1812 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1813 { 1814 #if 0 1815 struct vtnet_softc *sc; 1816 #endif 1817 int protocol; 1818 1819 #if 0 1820 sc = rxq->vtnrx_sc; 1821 #endif 1822 1823 switch (etype) { 1824 #if defined(INET) 1825 case ETHERTYPE_IP: 1826 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1827 protocol = IPPROTO_DONE; 1828 else { 1829 struct ip *ip = (struct ip *)(m->m_data + hoff); 1830 protocol = ip->ip_p; 1831 } 1832 break; 1833 #endif 1834 #if defined(INET6) 1835 case ETHERTYPE_IPV6: 1836 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1837 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1838 protocol = IPPROTO_DONE; 1839 break; 1840 #endif 1841 default: 1842 protocol = IPPROTO_DONE; 1843 break; 1844 } 1845 1846 switch (protocol) { 1847 case IPPROTO_TCP: 1848 case IPPROTO_UDP: 1849 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1850 m->m_pkthdr.csum_data = 0xFFFF; 1851 break; 1852 default: 1853 /* 1854 * FreeBSD does not support checksum offloading of this 1855 * protocol. Let the stack re-verify the checksum later 1856 * if the protocol is supported. 1857 */ 1858 #if 0 1859 if_printf(sc->vtnet_ifp, 1860 "%s: checksum offload of unsupported protocol " 1861 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1862 __func__, etype, protocol, hdr->csum_start, 1863 hdr->csum_offset); 1864 #endif 1865 break; 1866 } 1867 1868 return (0); 1869 } 1870 1871 static int 1872 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1873 struct virtio_net_hdr *hdr) 1874 { 1875 const struct ether_header *eh; 1876 int hoff; 1877 uint16_t etype; 1878 1879 eh = mtod(m, const struct ether_header *); 1880 etype = ntohs(eh->ether_type); 1881 if (etype == ETHERTYPE_VLAN) { 1882 /* TODO BMV: Handle QinQ. */ 1883 const struct ether_vlan_header *evh = 1884 mtod(m, const struct ether_vlan_header *); 1885 etype = ntohs(evh->evl_proto); 1886 hoff = sizeof(struct ether_vlan_header); 1887 } else 1888 hoff = sizeof(struct ether_header); 1889 1890 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1891 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1892 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1893 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1894 } 1895 1896 static void 1897 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1898 { 1899 struct mbuf *m; 1900 1901 while (--nbufs > 0) { 1902 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1903 if (m == NULL) 1904 break; 1905 vtnet_rxq_discard_buf(rxq, m); 1906 } 1907 } 1908 1909 static void 1910 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1911 { 1912 int error __diagused; 1913 1914 /* 1915 * Requeue the discarded mbuf. This should always be successful 1916 * since it was just dequeued. 1917 */ 1918 error = vtnet_rxq_enqueue_buf(rxq, m); 1919 KASSERT(error == 0, 1920 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1921 } 1922 1923 static int 1924 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1925 { 1926 struct vtnet_softc *sc; 1927 struct virtqueue *vq; 1928 struct mbuf *m_tail; 1929 1930 sc = rxq->vtnrx_sc; 1931 vq = rxq->vtnrx_vq; 1932 m_tail = m_head; 1933 1934 while (--nbufs > 0) { 1935 struct mbuf *m; 1936 uint32_t len; 1937 1938 m = virtqueue_dequeue(vq, &len); 1939 if (m == NULL) { 1940 rxq->vtnrx_stats.vrxs_ierrors++; 1941 goto fail; 1942 } 1943 1944 if (vtnet_rxq_new_buf(rxq) != 0) { 1945 rxq->vtnrx_stats.vrxs_iqdrops++; 1946 vtnet_rxq_discard_buf(rxq, m); 1947 if (nbufs > 1) 1948 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1949 goto fail; 1950 } 1951 1952 if (m->m_len < len) 1953 len = m->m_len; 1954 1955 m->m_len = len; 1956 m->m_flags &= ~M_PKTHDR; 1957 1958 m_head->m_pkthdr.len += len; 1959 m_tail->m_next = m; 1960 m_tail = m; 1961 } 1962 1963 return (0); 1964 1965 fail: 1966 sc->vtnet_stats.rx_mergeable_failed++; 1967 m_freem(m_head); 1968 1969 return (1); 1970 } 1971 1972 #if defined(INET) || defined(INET6) 1973 static int 1974 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1975 { 1976 struct lro_ctrl *lro; 1977 1978 lro = &rxq->vtnrx_lro; 1979 1980 if (lro->lro_mbuf_max != 0) { 1981 tcp_lro_queue_mbuf(lro, m); 1982 return (0); 1983 } 1984 1985 return (tcp_lro_rx(lro, m, 0)); 1986 } 1987 #endif 1988 1989 static void 1990 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1991 struct virtio_net_hdr *hdr) 1992 { 1993 struct vtnet_softc *sc; 1994 struct ifnet *ifp; 1995 1996 sc = rxq->vtnrx_sc; 1997 ifp = sc->vtnet_ifp; 1998 1999 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 2000 struct ether_header *eh = mtod(m, struct ether_header *); 2001 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2002 vtnet_vlan_tag_remove(m); 2003 /* 2004 * With the 802.1Q header removed, update the 2005 * checksum starting location accordingly. 2006 */ 2007 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2008 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2009 } 2010 } 2011 2012 m->m_pkthdr.flowid = rxq->vtnrx_id; 2013 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2014 2015 if (hdr->flags & 2016 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2017 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2018 rxq->vtnrx_stats.vrxs_csum++; 2019 else 2020 rxq->vtnrx_stats.vrxs_csum_failed++; 2021 } 2022 2023 if (hdr->gso_size != 0) { 2024 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2025 case VIRTIO_NET_HDR_GSO_TCPV4: 2026 case VIRTIO_NET_HDR_GSO_TCPV6: 2027 m->m_pkthdr.lro_nsegs = 2028 howmany(m->m_pkthdr.len, hdr->gso_size); 2029 rxq->vtnrx_stats.vrxs_host_lro++; 2030 break; 2031 } 2032 } 2033 2034 rxq->vtnrx_stats.vrxs_ipackets++; 2035 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2036 2037 #if defined(INET) || defined(INET6) 2038 if (vtnet_software_lro(sc) && ifp->if_capenable & IFCAP_LRO) { 2039 if (vtnet_lro_rx(rxq, m) == 0) 2040 return; 2041 } 2042 #endif 2043 2044 (*ifp->if_input)(ifp, m); 2045 } 2046 2047 static int 2048 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2049 { 2050 struct virtio_net_hdr lhdr, *hdr; 2051 struct vtnet_softc *sc; 2052 struct ifnet *ifp; 2053 struct virtqueue *vq; 2054 int deq, count; 2055 2056 sc = rxq->vtnrx_sc; 2057 vq = rxq->vtnrx_vq; 2058 ifp = sc->vtnet_ifp; 2059 deq = 0; 2060 count = sc->vtnet_rx_process_limit; 2061 2062 VTNET_RXQ_LOCK_ASSERT(rxq); 2063 2064 while (count-- > 0) { 2065 struct mbuf *m; 2066 uint32_t len, nbufs, adjsz; 2067 2068 m = virtqueue_dequeue(vq, &len); 2069 if (m == NULL) 2070 break; 2071 deq++; 2072 2073 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2074 rxq->vtnrx_stats.vrxs_ierrors++; 2075 vtnet_rxq_discard_buf(rxq, m); 2076 continue; 2077 } 2078 2079 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2080 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2081 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2082 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2083 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2084 } else if (vtnet_modern(sc)) { 2085 nbufs = 1; /* num_buffers is always 1 */ 2086 adjsz = sizeof(struct virtio_net_hdr_v1); 2087 } else { 2088 nbufs = 1; 2089 adjsz = sizeof(struct vtnet_rx_header); 2090 /* 2091 * Account for our gap between the header and start of 2092 * data to keep the segments separated. 2093 */ 2094 len += VTNET_RX_HEADER_PAD; 2095 } 2096 2097 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2098 rxq->vtnrx_stats.vrxs_iqdrops++; 2099 vtnet_rxq_discard_buf(rxq, m); 2100 if (nbufs > 1) 2101 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2102 continue; 2103 } 2104 2105 m->m_pkthdr.len = len; 2106 m->m_pkthdr.rcvif = ifp; 2107 m->m_pkthdr.csum_flags = 0; 2108 2109 if (nbufs > 1) { 2110 /* Dequeue the rest of chain. */ 2111 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2112 continue; 2113 } 2114 2115 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2116 2117 /* 2118 * Save an endian swapped version of the header prior to it 2119 * being stripped. The header is always at the start of the 2120 * mbuf data. num_buffers was already saved (and not needed) 2121 * so use the standard header. 2122 */ 2123 hdr = mtod(m, struct virtio_net_hdr *); 2124 lhdr.flags = hdr->flags; 2125 lhdr.gso_type = hdr->gso_type; 2126 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2127 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2128 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2129 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2130 m_adj(m, adjsz); 2131 2132 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2133 pfil_return_t pfil; 2134 2135 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 2136 NULL); 2137 switch (pfil) { 2138 case PFIL_REALLOCED: 2139 m = pfil_mem2mbuf(m->m_data); 2140 break; 2141 case PFIL_DROPPED: 2142 case PFIL_CONSUMED: 2143 continue; 2144 default: 2145 KASSERT(pfil == PFIL_PASS, 2146 ("Filter returned %d!", pfil)); 2147 } 2148 } 2149 2150 vtnet_rxq_input(rxq, m, &lhdr); 2151 } 2152 2153 if (deq > 0) { 2154 #if defined(INET) || defined(INET6) 2155 if (vtnet_software_lro(sc)) 2156 tcp_lro_flush_all(&rxq->vtnrx_lro); 2157 #endif 2158 virtqueue_notify(vq); 2159 } 2160 2161 return (count > 0 ? 0 : EAGAIN); 2162 } 2163 2164 static void 2165 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2166 { 2167 struct vtnet_softc *sc; 2168 struct ifnet *ifp; 2169 u_int more; 2170 #ifdef DEV_NETMAP 2171 int nmirq; 2172 #endif /* DEV_NETMAP */ 2173 2174 sc = rxq->vtnrx_sc; 2175 ifp = sc->vtnet_ifp; 2176 2177 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2178 /* 2179 * Ignore this interrupt. Either this is a spurious interrupt 2180 * or multiqueue without per-VQ MSIX so every queue needs to 2181 * be polled (a brain dead configuration we could try harder 2182 * to avoid). 2183 */ 2184 vtnet_rxq_disable_intr(rxq); 2185 return; 2186 } 2187 2188 VTNET_RXQ_LOCK(rxq); 2189 2190 #ifdef DEV_NETMAP 2191 /* 2192 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2193 * This is not necessary to serialize the access to the RX vq, but 2194 * rather to avoid races that may happen if this interface is 2195 * attached to a VALE switch, which would cause received packets 2196 * to stall in the RX queue (nm_kr_tryget() could find the kring 2197 * busy when called from netmap_bwrap_intr_notify()). 2198 */ 2199 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2200 if (nmirq != NM_IRQ_PASS) { 2201 VTNET_RXQ_UNLOCK(rxq); 2202 if (nmirq == NM_IRQ_RESCHED) { 2203 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2204 } 2205 return; 2206 } 2207 #endif /* DEV_NETMAP */ 2208 2209 again: 2210 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2211 VTNET_RXQ_UNLOCK(rxq); 2212 return; 2213 } 2214 2215 more = vtnet_rxq_eof(rxq); 2216 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2217 if (!more) 2218 vtnet_rxq_disable_intr(rxq); 2219 /* 2220 * This is an occasional condition or race (when !more), 2221 * so retry a few times before scheduling the taskqueue. 2222 */ 2223 if (tries-- > 0) 2224 goto again; 2225 2226 rxq->vtnrx_stats.vrxs_rescheduled++; 2227 VTNET_RXQ_UNLOCK(rxq); 2228 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2229 } else 2230 VTNET_RXQ_UNLOCK(rxq); 2231 } 2232 2233 static void 2234 vtnet_rx_vq_intr(void *xrxq) 2235 { 2236 struct vtnet_rxq *rxq; 2237 2238 rxq = xrxq; 2239 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2240 } 2241 2242 static void 2243 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2244 { 2245 struct vtnet_rxq *rxq; 2246 2247 rxq = xrxq; 2248 vtnet_rx_vq_process(rxq, 0); 2249 } 2250 2251 static int 2252 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2253 { 2254 struct vtnet_softc *sc; 2255 int threshold; 2256 2257 sc = txq->vtntx_sc; 2258 2259 /* 2260 * The Tx interrupt is disabled until the queue free count falls 2261 * below our threshold. Completed frames are drained from the Tx 2262 * virtqueue before transmitting new frames and in the watchdog 2263 * callout, so the frequency of Tx interrupts is greatly reduced, 2264 * at the cost of not freeing mbufs as quickly as they otherwise 2265 * would be. 2266 */ 2267 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2268 2269 /* 2270 * Without indirect descriptors, leave enough room for the most 2271 * segments we handle. 2272 */ 2273 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2274 threshold < sc->vtnet_tx_nsegs) 2275 threshold = sc->vtnet_tx_nsegs; 2276 2277 return (threshold); 2278 } 2279 2280 static int 2281 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2282 { 2283 struct virtqueue *vq; 2284 2285 vq = txq->vtntx_vq; 2286 2287 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2288 } 2289 2290 static int 2291 vtnet_txq_notify(struct vtnet_txq *txq) 2292 { 2293 struct virtqueue *vq; 2294 2295 vq = txq->vtntx_vq; 2296 2297 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2298 virtqueue_notify(vq); 2299 2300 if (vtnet_txq_enable_intr(txq) == 0) 2301 return (0); 2302 2303 /* 2304 * Drain frames that were completed since last checked. If this 2305 * causes the queue to go above the threshold, the caller should 2306 * continue transmitting. 2307 */ 2308 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2309 virtqueue_disable_intr(vq); 2310 return (1); 2311 } 2312 2313 return (0); 2314 } 2315 2316 static void 2317 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2318 { 2319 struct virtqueue *vq; 2320 struct vtnet_tx_header *txhdr; 2321 int last; 2322 #ifdef DEV_NETMAP 2323 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2324 txq->vtntx_id, NR_TX); 2325 #else /* !DEV_NETMAP */ 2326 void *kring = NULL; 2327 #endif /* !DEV_NETMAP */ 2328 2329 vq = txq->vtntx_vq; 2330 last = 0; 2331 2332 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2333 if (kring == NULL) { 2334 m_freem(txhdr->vth_mbuf); 2335 uma_zfree(vtnet_tx_header_zone, txhdr); 2336 } 2337 } 2338 2339 KASSERT(virtqueue_empty(vq), 2340 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2341 } 2342 2343 /* 2344 * BMV: This can go away once we finally have offsets in the mbuf header. 2345 */ 2346 static int 2347 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2348 int *proto, int *start) 2349 { 2350 struct vtnet_softc *sc; 2351 struct ether_vlan_header *evh; 2352 int offset; 2353 2354 sc = txq->vtntx_sc; 2355 2356 evh = mtod(m, struct ether_vlan_header *); 2357 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2358 /* BMV: We should handle nested VLAN tags too. */ 2359 *etype = ntohs(evh->evl_proto); 2360 offset = sizeof(struct ether_vlan_header); 2361 } else { 2362 *etype = ntohs(evh->evl_encap_proto); 2363 offset = sizeof(struct ether_header); 2364 } 2365 2366 switch (*etype) { 2367 #if defined(INET) 2368 case ETHERTYPE_IP: { 2369 struct ip *ip, iphdr; 2370 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2371 m_copydata(m, offset, sizeof(struct ip), 2372 (caddr_t) &iphdr); 2373 ip = &iphdr; 2374 } else 2375 ip = (struct ip *)(m->m_data + offset); 2376 *proto = ip->ip_p; 2377 *start = offset + (ip->ip_hl << 2); 2378 break; 2379 } 2380 #endif 2381 #if defined(INET6) 2382 case ETHERTYPE_IPV6: 2383 *proto = -1; 2384 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2385 /* Assert the network stack sent us a valid packet. */ 2386 KASSERT(*start > offset, 2387 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2388 *start, offset, *proto)); 2389 break; 2390 #endif 2391 default: 2392 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2393 return (EINVAL); 2394 } 2395 2396 return (0); 2397 } 2398 2399 static int 2400 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2401 int offset, struct virtio_net_hdr *hdr) 2402 { 2403 static struct timeval lastecn; 2404 static int curecn; 2405 struct vtnet_softc *sc; 2406 struct tcphdr *tcp, tcphdr; 2407 2408 sc = txq->vtntx_sc; 2409 2410 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2411 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2412 tcp = &tcphdr; 2413 } else 2414 tcp = (struct tcphdr *)(m->m_data + offset); 2415 2416 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2417 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2418 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2419 VIRTIO_NET_HDR_GSO_TCPV6; 2420 2421 if (__predict_false(tcp->th_flags & TH_CWR)) { 2422 /* 2423 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2424 * FreeBSD, ECN support is not on a per-interface basis, 2425 * but globally via the net.inet.tcp.ecn.enable sysctl 2426 * knob. The default is off. 2427 */ 2428 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2429 if (ppsratecheck(&lastecn, &curecn, 1)) 2430 if_printf(sc->vtnet_ifp, 2431 "TSO with ECN not negotiated with host\n"); 2432 return (ENOTSUP); 2433 } 2434 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2435 } 2436 2437 txq->vtntx_stats.vtxs_tso++; 2438 2439 return (0); 2440 } 2441 2442 static struct mbuf * 2443 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2444 struct virtio_net_hdr *hdr) 2445 { 2446 struct vtnet_softc *sc; 2447 int flags, etype, csum_start, proto, error; 2448 2449 sc = txq->vtntx_sc; 2450 flags = m->m_pkthdr.csum_flags; 2451 2452 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2453 if (error) 2454 goto drop; 2455 2456 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2457 /* Sanity check the parsed mbuf matches the offload flags. */ 2458 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2459 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2460 && etype != ETHERTYPE_IPV6))) { 2461 sc->vtnet_stats.tx_csum_proto_mismatch++; 2462 goto drop; 2463 } 2464 2465 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2466 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2467 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2468 txq->vtntx_stats.vtxs_csum++; 2469 } 2470 2471 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2472 /* 2473 * Sanity check the parsed mbuf IP protocol is TCP, and 2474 * VirtIO TSO reqires the checksum offloading above. 2475 */ 2476 if (__predict_false(proto != IPPROTO_TCP)) { 2477 sc->vtnet_stats.tx_tso_not_tcp++; 2478 goto drop; 2479 } else if (__predict_false((hdr->flags & 2480 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2481 sc->vtnet_stats.tx_tso_without_csum++; 2482 goto drop; 2483 } 2484 2485 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2486 if (error) 2487 goto drop; 2488 } 2489 2490 return (m); 2491 2492 drop: 2493 m_freem(m); 2494 return (NULL); 2495 } 2496 2497 static int 2498 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2499 struct vtnet_tx_header *txhdr) 2500 { 2501 struct vtnet_softc *sc; 2502 struct virtqueue *vq; 2503 struct sglist *sg; 2504 struct mbuf *m; 2505 int error; 2506 2507 sc = txq->vtntx_sc; 2508 vq = txq->vtntx_vq; 2509 sg = txq->vtntx_sg; 2510 m = *m_head; 2511 2512 sglist_reset(sg); 2513 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2514 if (error != 0 || sg->sg_nseg != 1) { 2515 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2516 __func__, error, sg->sg_nseg)); 2517 goto fail; 2518 } 2519 2520 error = sglist_append_mbuf(sg, m); 2521 if (error) { 2522 m = m_defrag(m, M_NOWAIT); 2523 if (m == NULL) 2524 goto fail; 2525 2526 *m_head = m; 2527 sc->vtnet_stats.tx_defragged++; 2528 2529 error = sglist_append_mbuf(sg, m); 2530 if (error) 2531 goto fail; 2532 } 2533 2534 txhdr->vth_mbuf = m; 2535 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2536 2537 return (error); 2538 2539 fail: 2540 sc->vtnet_stats.tx_defrag_failed++; 2541 m_freem(*m_head); 2542 *m_head = NULL; 2543 2544 return (ENOBUFS); 2545 } 2546 2547 static int 2548 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2549 { 2550 struct vtnet_tx_header *txhdr; 2551 struct virtio_net_hdr *hdr; 2552 struct mbuf *m; 2553 int error; 2554 2555 m = *m_head; 2556 M_ASSERTPKTHDR(m); 2557 2558 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2559 if (txhdr == NULL) { 2560 m_freem(m); 2561 *m_head = NULL; 2562 return (ENOMEM); 2563 } 2564 2565 /* 2566 * Always use the non-mergeable header, regardless if mergable headers 2567 * were negotiated, because for transmit num_buffers is always zero. 2568 * The vtnet_hdr_size is used to enqueue the right header size segment. 2569 */ 2570 hdr = &txhdr->vth_uhdr.hdr; 2571 2572 if (m->m_flags & M_VLANTAG) { 2573 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2574 if ((*m_head = m) == NULL) { 2575 error = ENOBUFS; 2576 goto fail; 2577 } 2578 m->m_flags &= ~M_VLANTAG; 2579 } 2580 2581 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2582 m = vtnet_txq_offload(txq, m, hdr); 2583 if ((*m_head = m) == NULL) { 2584 error = ENOBUFS; 2585 goto fail; 2586 } 2587 } 2588 2589 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2590 fail: 2591 if (error) 2592 uma_zfree(vtnet_tx_header_zone, txhdr); 2593 2594 return (error); 2595 } 2596 2597 #ifdef VTNET_LEGACY_TX 2598 2599 static void 2600 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2601 { 2602 struct vtnet_softc *sc; 2603 struct virtqueue *vq; 2604 struct mbuf *m0; 2605 int tries, enq; 2606 2607 sc = txq->vtntx_sc; 2608 vq = txq->vtntx_vq; 2609 tries = 0; 2610 2611 VTNET_TXQ_LOCK_ASSERT(txq); 2612 2613 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2614 sc->vtnet_link_active == 0) 2615 return; 2616 2617 vtnet_txq_eof(txq); 2618 2619 again: 2620 enq = 0; 2621 2622 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2623 if (virtqueue_full(vq)) 2624 break; 2625 2626 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2627 if (m0 == NULL) 2628 break; 2629 2630 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2631 if (m0 != NULL) 2632 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2633 break; 2634 } 2635 2636 enq++; 2637 ETHER_BPF_MTAP(ifp, m0); 2638 } 2639 2640 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2641 if (tries++ < VTNET_NOTIFY_RETRIES) 2642 goto again; 2643 2644 txq->vtntx_stats.vtxs_rescheduled++; 2645 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2646 } 2647 } 2648 2649 static void 2650 vtnet_start(struct ifnet *ifp) 2651 { 2652 struct vtnet_softc *sc; 2653 struct vtnet_txq *txq; 2654 2655 sc = ifp->if_softc; 2656 txq = &sc->vtnet_txqs[0]; 2657 2658 VTNET_TXQ_LOCK(txq); 2659 vtnet_start_locked(txq, ifp); 2660 VTNET_TXQ_UNLOCK(txq); 2661 } 2662 2663 #else /* !VTNET_LEGACY_TX */ 2664 2665 static int 2666 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2667 { 2668 struct vtnet_softc *sc; 2669 struct virtqueue *vq; 2670 struct buf_ring *br; 2671 struct ifnet *ifp; 2672 int enq, tries, error; 2673 2674 sc = txq->vtntx_sc; 2675 vq = txq->vtntx_vq; 2676 br = txq->vtntx_br; 2677 ifp = sc->vtnet_ifp; 2678 tries = 0; 2679 error = 0; 2680 2681 VTNET_TXQ_LOCK_ASSERT(txq); 2682 2683 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2684 sc->vtnet_link_active == 0) { 2685 if (m != NULL) 2686 error = drbr_enqueue(ifp, br, m); 2687 return (error); 2688 } 2689 2690 if (m != NULL) { 2691 error = drbr_enqueue(ifp, br, m); 2692 if (error) 2693 return (error); 2694 } 2695 2696 vtnet_txq_eof(txq); 2697 2698 again: 2699 enq = 0; 2700 2701 while ((m = drbr_peek(ifp, br)) != NULL) { 2702 if (virtqueue_full(vq)) { 2703 drbr_putback(ifp, br, m); 2704 break; 2705 } 2706 2707 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2708 if (m != NULL) 2709 drbr_putback(ifp, br, m); 2710 else 2711 drbr_advance(ifp, br); 2712 break; 2713 } 2714 drbr_advance(ifp, br); 2715 2716 enq++; 2717 ETHER_BPF_MTAP(ifp, m); 2718 } 2719 2720 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2721 if (tries++ < VTNET_NOTIFY_RETRIES) 2722 goto again; 2723 2724 txq->vtntx_stats.vtxs_rescheduled++; 2725 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2726 } 2727 2728 return (0); 2729 } 2730 2731 static int 2732 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2733 { 2734 struct vtnet_softc *sc; 2735 struct vtnet_txq *txq; 2736 int i, npairs, error; 2737 2738 sc = ifp->if_softc; 2739 npairs = sc->vtnet_act_vq_pairs; 2740 2741 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2742 i = m->m_pkthdr.flowid % npairs; 2743 else 2744 i = curcpu % npairs; 2745 2746 txq = &sc->vtnet_txqs[i]; 2747 2748 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2749 error = vtnet_txq_mq_start_locked(txq, m); 2750 VTNET_TXQ_UNLOCK(txq); 2751 } else { 2752 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2753 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2754 } 2755 2756 return (error); 2757 } 2758 2759 static void 2760 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2761 { 2762 struct vtnet_softc *sc; 2763 struct vtnet_txq *txq; 2764 2765 txq = xtxq; 2766 sc = txq->vtntx_sc; 2767 2768 VTNET_TXQ_LOCK(txq); 2769 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2770 vtnet_txq_mq_start_locked(txq, NULL); 2771 VTNET_TXQ_UNLOCK(txq); 2772 } 2773 2774 #endif /* VTNET_LEGACY_TX */ 2775 2776 static void 2777 vtnet_txq_start(struct vtnet_txq *txq) 2778 { 2779 struct vtnet_softc *sc; 2780 struct ifnet *ifp; 2781 2782 sc = txq->vtntx_sc; 2783 ifp = sc->vtnet_ifp; 2784 2785 #ifdef VTNET_LEGACY_TX 2786 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2787 vtnet_start_locked(txq, ifp); 2788 #else 2789 if (!drbr_empty(ifp, txq->vtntx_br)) 2790 vtnet_txq_mq_start_locked(txq, NULL); 2791 #endif 2792 } 2793 2794 static void 2795 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2796 { 2797 struct vtnet_softc *sc; 2798 struct vtnet_txq *txq; 2799 struct ifnet *ifp; 2800 2801 txq = xtxq; 2802 sc = txq->vtntx_sc; 2803 ifp = sc->vtnet_ifp; 2804 2805 VTNET_TXQ_LOCK(txq); 2806 2807 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2808 VTNET_TXQ_UNLOCK(txq); 2809 return; 2810 } 2811 2812 vtnet_txq_eof(txq); 2813 vtnet_txq_start(txq); 2814 2815 VTNET_TXQ_UNLOCK(txq); 2816 } 2817 2818 static int 2819 vtnet_txq_eof(struct vtnet_txq *txq) 2820 { 2821 struct virtqueue *vq; 2822 struct vtnet_tx_header *txhdr; 2823 struct mbuf *m; 2824 int deq; 2825 2826 vq = txq->vtntx_vq; 2827 deq = 0; 2828 VTNET_TXQ_LOCK_ASSERT(txq); 2829 2830 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2831 m = txhdr->vth_mbuf; 2832 deq++; 2833 2834 txq->vtntx_stats.vtxs_opackets++; 2835 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2836 if (m->m_flags & M_MCAST) 2837 txq->vtntx_stats.vtxs_omcasts++; 2838 2839 m_freem(m); 2840 uma_zfree(vtnet_tx_header_zone, txhdr); 2841 } 2842 2843 if (virtqueue_empty(vq)) 2844 txq->vtntx_watchdog = 0; 2845 2846 return (deq); 2847 } 2848 2849 static void 2850 vtnet_tx_vq_intr(void *xtxq) 2851 { 2852 struct vtnet_softc *sc; 2853 struct vtnet_txq *txq; 2854 struct ifnet *ifp; 2855 2856 txq = xtxq; 2857 sc = txq->vtntx_sc; 2858 ifp = sc->vtnet_ifp; 2859 2860 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2861 /* 2862 * Ignore this interrupt. Either this is a spurious interrupt 2863 * or multiqueue without per-VQ MSIX so every queue needs to 2864 * be polled (a brain dead configuration we could try harder 2865 * to avoid). 2866 */ 2867 vtnet_txq_disable_intr(txq); 2868 return; 2869 } 2870 2871 #ifdef DEV_NETMAP 2872 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2873 return; 2874 #endif /* DEV_NETMAP */ 2875 2876 VTNET_TXQ_LOCK(txq); 2877 2878 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2879 VTNET_TXQ_UNLOCK(txq); 2880 return; 2881 } 2882 2883 vtnet_txq_eof(txq); 2884 vtnet_txq_start(txq); 2885 2886 VTNET_TXQ_UNLOCK(txq); 2887 } 2888 2889 static void 2890 vtnet_tx_start_all(struct vtnet_softc *sc) 2891 { 2892 struct vtnet_txq *txq; 2893 int i; 2894 2895 VTNET_CORE_LOCK_ASSERT(sc); 2896 2897 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2898 txq = &sc->vtnet_txqs[i]; 2899 2900 VTNET_TXQ_LOCK(txq); 2901 vtnet_txq_start(txq); 2902 VTNET_TXQ_UNLOCK(txq); 2903 } 2904 } 2905 2906 #ifndef VTNET_LEGACY_TX 2907 static void 2908 vtnet_qflush(struct ifnet *ifp) 2909 { 2910 struct vtnet_softc *sc; 2911 struct vtnet_txq *txq; 2912 struct mbuf *m; 2913 int i; 2914 2915 sc = ifp->if_softc; 2916 2917 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2918 txq = &sc->vtnet_txqs[i]; 2919 2920 VTNET_TXQ_LOCK(txq); 2921 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2922 m_freem(m); 2923 VTNET_TXQ_UNLOCK(txq); 2924 } 2925 2926 if_qflush(ifp); 2927 } 2928 #endif 2929 2930 static int 2931 vtnet_watchdog(struct vtnet_txq *txq) 2932 { 2933 struct ifnet *ifp; 2934 2935 ifp = txq->vtntx_sc->vtnet_ifp; 2936 2937 VTNET_TXQ_LOCK(txq); 2938 if (txq->vtntx_watchdog == 1) { 2939 /* 2940 * Only drain completed frames if the watchdog is about to 2941 * expire. If any frames were drained, there may be enough 2942 * free descriptors now available to transmit queued frames. 2943 * In that case, the timer will immediately be decremented 2944 * below, but the timeout is generous enough that should not 2945 * be a problem. 2946 */ 2947 if (vtnet_txq_eof(txq) != 0) 2948 vtnet_txq_start(txq); 2949 } 2950 2951 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2952 VTNET_TXQ_UNLOCK(txq); 2953 return (0); 2954 } 2955 VTNET_TXQ_UNLOCK(txq); 2956 2957 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2958 return (1); 2959 } 2960 2961 static void 2962 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2963 struct vtnet_txq_stats *txacc) 2964 { 2965 2966 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2967 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2968 2969 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2970 struct vtnet_rxq_stats *rxst; 2971 struct vtnet_txq_stats *txst; 2972 2973 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2974 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2975 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2976 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2977 rxacc->vrxs_csum += rxst->vrxs_csum; 2978 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2979 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2980 2981 txst = &sc->vtnet_txqs[i].vtntx_stats; 2982 txacc->vtxs_opackets += txst->vtxs_opackets; 2983 txacc->vtxs_obytes += txst->vtxs_obytes; 2984 txacc->vtxs_csum += txst->vtxs_csum; 2985 txacc->vtxs_tso += txst->vtxs_tso; 2986 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2987 } 2988 } 2989 2990 static uint64_t 2991 vtnet_get_counter(if_t ifp, ift_counter cnt) 2992 { 2993 struct vtnet_softc *sc; 2994 struct vtnet_rxq_stats rxaccum; 2995 struct vtnet_txq_stats txaccum; 2996 2997 sc = if_getsoftc(ifp); 2998 vtnet_accum_stats(sc, &rxaccum, &txaccum); 2999 3000 switch (cnt) { 3001 case IFCOUNTER_IPACKETS: 3002 return (rxaccum.vrxs_ipackets); 3003 case IFCOUNTER_IQDROPS: 3004 return (rxaccum.vrxs_iqdrops); 3005 case IFCOUNTER_IERRORS: 3006 return (rxaccum.vrxs_ierrors); 3007 case IFCOUNTER_OPACKETS: 3008 return (txaccum.vtxs_opackets); 3009 #ifndef VTNET_LEGACY_TX 3010 case IFCOUNTER_OBYTES: 3011 return (txaccum.vtxs_obytes); 3012 case IFCOUNTER_OMCASTS: 3013 return (txaccum.vtxs_omcasts); 3014 #endif 3015 default: 3016 return (if_get_counter_default(ifp, cnt)); 3017 } 3018 } 3019 3020 static void 3021 vtnet_tick(void *xsc) 3022 { 3023 struct vtnet_softc *sc; 3024 struct ifnet *ifp; 3025 int i, timedout; 3026 3027 sc = xsc; 3028 ifp = sc->vtnet_ifp; 3029 timedout = 0; 3030 3031 VTNET_CORE_LOCK_ASSERT(sc); 3032 3033 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3034 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3035 3036 if (timedout != 0) { 3037 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3038 vtnet_init_locked(sc, 0); 3039 } else 3040 callout_schedule(&sc->vtnet_tick_ch, hz); 3041 } 3042 3043 static void 3044 vtnet_start_taskqueues(struct vtnet_softc *sc) 3045 { 3046 device_t dev; 3047 struct vtnet_rxq *rxq; 3048 struct vtnet_txq *txq; 3049 int i, error; 3050 3051 dev = sc->vtnet_dev; 3052 3053 /* 3054 * Errors here are very difficult to recover from - we cannot 3055 * easily fail because, if this is during boot, we will hang 3056 * when freeing any successfully started taskqueues because 3057 * the scheduler isn't up yet. 3058 * 3059 * Most drivers just ignore the return value - it only fails 3060 * with ENOMEM so an error is not likely. 3061 */ 3062 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3063 rxq = &sc->vtnet_rxqs[i]; 3064 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3065 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3066 if (error) { 3067 device_printf(dev, "failed to start rx taskq %d\n", 3068 rxq->vtnrx_id); 3069 } 3070 3071 txq = &sc->vtnet_txqs[i]; 3072 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3073 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3074 if (error) { 3075 device_printf(dev, "failed to start tx taskq %d\n", 3076 txq->vtntx_id); 3077 } 3078 } 3079 } 3080 3081 static void 3082 vtnet_free_taskqueues(struct vtnet_softc *sc) 3083 { 3084 struct vtnet_rxq *rxq; 3085 struct vtnet_txq *txq; 3086 int i; 3087 3088 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3089 rxq = &sc->vtnet_rxqs[i]; 3090 if (rxq->vtnrx_tq != NULL) { 3091 taskqueue_free(rxq->vtnrx_tq); 3092 rxq->vtnrx_tq = NULL; 3093 } 3094 3095 txq = &sc->vtnet_txqs[i]; 3096 if (txq->vtntx_tq != NULL) { 3097 taskqueue_free(txq->vtntx_tq); 3098 txq->vtntx_tq = NULL; 3099 } 3100 } 3101 } 3102 3103 static void 3104 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3105 { 3106 struct vtnet_rxq *rxq; 3107 struct vtnet_txq *txq; 3108 int i; 3109 3110 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3111 rxq = &sc->vtnet_rxqs[i]; 3112 if (rxq->vtnrx_tq != NULL) 3113 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3114 3115 txq = &sc->vtnet_txqs[i]; 3116 if (txq->vtntx_tq != NULL) { 3117 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3118 #ifndef VTNET_LEGACY_TX 3119 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3120 #endif 3121 } 3122 } 3123 } 3124 3125 static void 3126 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3127 { 3128 struct vtnet_rxq *rxq; 3129 struct vtnet_txq *txq; 3130 int i; 3131 3132 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3133 rxq = &sc->vtnet_rxqs[i]; 3134 vtnet_rxq_free_mbufs(rxq); 3135 3136 txq = &sc->vtnet_txqs[i]; 3137 vtnet_txq_free_mbufs(txq); 3138 } 3139 } 3140 3141 static void 3142 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3143 { 3144 struct vtnet_rxq *rxq; 3145 struct vtnet_txq *txq; 3146 int i; 3147 3148 VTNET_CORE_LOCK_ASSERT(sc); 3149 3150 /* 3151 * Lock and unlock the per-queue mutex so we known the stop 3152 * state is visible. Doing only the active queues should be 3153 * sufficient, but it does not cost much extra to do all the 3154 * queues. 3155 */ 3156 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3157 rxq = &sc->vtnet_rxqs[i]; 3158 VTNET_RXQ_LOCK(rxq); 3159 VTNET_RXQ_UNLOCK(rxq); 3160 3161 txq = &sc->vtnet_txqs[i]; 3162 VTNET_TXQ_LOCK(txq); 3163 VTNET_TXQ_UNLOCK(txq); 3164 } 3165 } 3166 3167 static void 3168 vtnet_stop(struct vtnet_softc *sc) 3169 { 3170 device_t dev; 3171 struct ifnet *ifp; 3172 3173 dev = sc->vtnet_dev; 3174 ifp = sc->vtnet_ifp; 3175 3176 VTNET_CORE_LOCK_ASSERT(sc); 3177 3178 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3179 sc->vtnet_link_active = 0; 3180 callout_stop(&sc->vtnet_tick_ch); 3181 3182 /* Only advisory. */ 3183 vtnet_disable_interrupts(sc); 3184 3185 #ifdef DEV_NETMAP 3186 /* Stop any pending txsync/rxsync and disable them. */ 3187 netmap_disable_all_rings(ifp); 3188 #endif /* DEV_NETMAP */ 3189 3190 /* 3191 * Stop the host adapter. This resets it to the pre-initialized 3192 * state. It will not generate any interrupts until after it is 3193 * reinitialized. 3194 */ 3195 virtio_stop(dev); 3196 vtnet_stop_rendezvous(sc); 3197 3198 vtnet_drain_rxtx_queues(sc); 3199 sc->vtnet_act_vq_pairs = 1; 3200 } 3201 3202 static int 3203 vtnet_virtio_reinit(struct vtnet_softc *sc) 3204 { 3205 device_t dev; 3206 struct ifnet *ifp; 3207 uint64_t features; 3208 int error; 3209 3210 dev = sc->vtnet_dev; 3211 ifp = sc->vtnet_ifp; 3212 features = sc->vtnet_negotiated_features; 3213 3214 /* 3215 * Re-negotiate with the host, removing any disabled receive 3216 * features. Transmit features are disabled only on our side 3217 * via if_capenable and if_hwassist. 3218 */ 3219 3220 if ((ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3221 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3222 3223 if ((ifp->if_capenable & IFCAP_LRO) == 0) 3224 features &= ~VTNET_LRO_FEATURES; 3225 3226 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 3227 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3228 3229 error = virtio_reinit(dev, features); 3230 if (error) { 3231 device_printf(dev, "virtio reinit error %d\n", error); 3232 return (error); 3233 } 3234 3235 sc->vtnet_features = features; 3236 virtio_reinit_complete(dev); 3237 3238 return (0); 3239 } 3240 3241 static void 3242 vtnet_init_rx_filters(struct vtnet_softc *sc) 3243 { 3244 struct ifnet *ifp; 3245 3246 ifp = sc->vtnet_ifp; 3247 3248 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3249 vtnet_rx_filter(sc); 3250 vtnet_rx_filter_mac(sc); 3251 } 3252 3253 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 3254 vtnet_rx_filter_vlan(sc); 3255 } 3256 3257 static int 3258 vtnet_init_rx_queues(struct vtnet_softc *sc) 3259 { 3260 device_t dev; 3261 struct ifnet *ifp; 3262 struct vtnet_rxq *rxq; 3263 int i, clustersz, error; 3264 3265 dev = sc->vtnet_dev; 3266 ifp = sc->vtnet_ifp; 3267 3268 clustersz = vtnet_rx_cluster_size(sc, ifp->if_mtu); 3269 sc->vtnet_rx_clustersz = clustersz; 3270 3271 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3272 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3273 VTNET_MAX_RX_SIZE, clustersz); 3274 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3275 ("%s: too many rx mbufs %d for %d segments", __func__, 3276 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3277 } else 3278 sc->vtnet_rx_nmbufs = 1; 3279 3280 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3281 rxq = &sc->vtnet_rxqs[i]; 3282 3283 /* Hold the lock to satisfy asserts. */ 3284 VTNET_RXQ_LOCK(rxq); 3285 error = vtnet_rxq_populate(rxq); 3286 VTNET_RXQ_UNLOCK(rxq); 3287 3288 if (error) { 3289 device_printf(dev, "cannot populate Rx queue %d\n", i); 3290 return (error); 3291 } 3292 } 3293 3294 return (0); 3295 } 3296 3297 static int 3298 vtnet_init_tx_queues(struct vtnet_softc *sc) 3299 { 3300 struct vtnet_txq *txq; 3301 int i; 3302 3303 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3304 txq = &sc->vtnet_txqs[i]; 3305 txq->vtntx_watchdog = 0; 3306 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3307 #ifdef DEV_NETMAP 3308 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3309 #endif /* DEV_NETMAP */ 3310 } 3311 3312 return (0); 3313 } 3314 3315 static int 3316 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3317 { 3318 int error; 3319 3320 error = vtnet_init_rx_queues(sc); 3321 if (error) 3322 return (error); 3323 3324 error = vtnet_init_tx_queues(sc); 3325 if (error) 3326 return (error); 3327 3328 return (0); 3329 } 3330 3331 static void 3332 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3333 { 3334 device_t dev; 3335 int npairs; 3336 3337 dev = sc->vtnet_dev; 3338 3339 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3340 sc->vtnet_act_vq_pairs = 1; 3341 return; 3342 } 3343 3344 npairs = sc->vtnet_req_vq_pairs; 3345 3346 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3347 device_printf(dev, "cannot set active queue pairs to %d, " 3348 "falling back to 1 queue pair\n", npairs); 3349 npairs = 1; 3350 } 3351 3352 sc->vtnet_act_vq_pairs = npairs; 3353 } 3354 3355 static void 3356 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3357 { 3358 struct ifnet *ifp; 3359 uint64_t features; 3360 int error; 3361 3362 ifp = sc->vtnet_ifp; 3363 features = sc->vtnet_features; 3364 3365 VTNET_CORE_LOCK_ASSERT(sc); 3366 3367 if (ifp->if_capabilities & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3368 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3369 features |= VIRTIO_NET_F_GUEST_CSUM; 3370 else 3371 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3372 } 3373 3374 if (ifp->if_capabilities & IFCAP_LRO && !vtnet_software_lro(sc)) { 3375 if (ifp->if_capenable & IFCAP_LRO) 3376 features |= VTNET_LRO_FEATURES; 3377 else 3378 features &= ~VTNET_LRO_FEATURES; 3379 } 3380 3381 error = vtnet_ctrl_guest_offloads(sc, 3382 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3383 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3384 VIRTIO_NET_F_GUEST_UFO)); 3385 if (error) { 3386 device_printf(sc->vtnet_dev, 3387 "%s: cannot update Rx features\n", __func__); 3388 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 3389 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3390 vtnet_init_locked(sc, 0); 3391 } 3392 } else 3393 sc->vtnet_features = features; 3394 } 3395 3396 static int 3397 vtnet_reinit(struct vtnet_softc *sc) 3398 { 3399 struct ifnet *ifp; 3400 int error; 3401 3402 ifp = sc->vtnet_ifp; 3403 3404 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3405 3406 error = vtnet_virtio_reinit(sc); 3407 if (error) 3408 return (error); 3409 3410 vtnet_set_macaddr(sc); 3411 vtnet_set_active_vq_pairs(sc); 3412 3413 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3414 vtnet_init_rx_filters(sc); 3415 3416 ifp->if_hwassist = 0; 3417 if (ifp->if_capenable & IFCAP_TXCSUM) 3418 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3419 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3420 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3421 if (ifp->if_capenable & IFCAP_TSO4) 3422 ifp->if_hwassist |= CSUM_IP_TSO; 3423 if (ifp->if_capenable & IFCAP_TSO6) 3424 ifp->if_hwassist |= CSUM_IP6_TSO; 3425 3426 error = vtnet_init_rxtx_queues(sc); 3427 if (error) 3428 return (error); 3429 3430 return (0); 3431 } 3432 3433 static void 3434 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3435 { 3436 struct ifnet *ifp; 3437 3438 ifp = sc->vtnet_ifp; 3439 3440 VTNET_CORE_LOCK_ASSERT(sc); 3441 3442 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3443 return; 3444 3445 vtnet_stop(sc); 3446 3447 #ifdef DEV_NETMAP 3448 /* Once stopped we can update the netmap flags, if necessary. */ 3449 switch (init_mode) { 3450 case VTNET_INIT_NETMAP_ENTER: 3451 nm_set_native_flags(NA(ifp)); 3452 break; 3453 case VTNET_INIT_NETMAP_EXIT: 3454 nm_clear_native_flags(NA(ifp)); 3455 break; 3456 } 3457 #endif /* DEV_NETMAP */ 3458 3459 if (vtnet_reinit(sc) != 0) { 3460 vtnet_stop(sc); 3461 return; 3462 } 3463 3464 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3465 vtnet_update_link_status(sc); 3466 vtnet_enable_interrupts(sc); 3467 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3468 3469 #ifdef DEV_NETMAP 3470 /* Re-enable txsync/rxsync. */ 3471 netmap_enable_all_rings(ifp); 3472 #endif /* DEV_NETMAP */ 3473 } 3474 3475 static void 3476 vtnet_init(void *xsc) 3477 { 3478 struct vtnet_softc *sc; 3479 3480 sc = xsc; 3481 3482 VTNET_CORE_LOCK(sc); 3483 vtnet_init_locked(sc, 0); 3484 VTNET_CORE_UNLOCK(sc); 3485 } 3486 3487 static void 3488 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3489 { 3490 3491 /* 3492 * The control virtqueue is only polled and therefore it should 3493 * already be empty. 3494 */ 3495 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3496 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3497 } 3498 3499 static void 3500 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3501 struct sglist *sg, int readable, int writable) 3502 { 3503 struct virtqueue *vq; 3504 3505 vq = sc->vtnet_ctrl_vq; 3506 3507 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3508 VTNET_CORE_LOCK_ASSERT(sc); 3509 3510 if (!virtqueue_empty(vq)) 3511 return; 3512 3513 /* 3514 * Poll for the response, but the command is likely completed before 3515 * returning from the notify. 3516 */ 3517 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3518 virtqueue_notify(vq); 3519 virtqueue_poll(vq, NULL); 3520 } 3521 } 3522 3523 static int 3524 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3525 { 3526 struct sglist_seg segs[3]; 3527 struct sglist sg; 3528 struct { 3529 struct virtio_net_ctrl_hdr hdr __aligned(2); 3530 uint8_t pad1; 3531 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3532 uint8_t pad2; 3533 uint8_t ack; 3534 } s; 3535 int error; 3536 3537 error = 0; 3538 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3539 3540 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3541 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3542 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3543 s.ack = VIRTIO_NET_ERR; 3544 3545 sglist_init(&sg, nitems(segs), segs); 3546 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3547 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3548 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3549 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3550 3551 if (error == 0) 3552 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3553 3554 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3555 } 3556 3557 static int 3558 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3559 { 3560 struct sglist_seg segs[3]; 3561 struct sglist sg; 3562 struct { 3563 struct virtio_net_ctrl_hdr hdr __aligned(2); 3564 uint8_t pad1; 3565 uint64_t offloads __aligned(8); 3566 uint8_t pad2; 3567 uint8_t ack; 3568 } s; 3569 int error; 3570 3571 error = 0; 3572 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3573 3574 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3575 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3576 s.offloads = vtnet_gtoh64(sc, offloads); 3577 s.ack = VIRTIO_NET_ERR; 3578 3579 sglist_init(&sg, nitems(segs), segs); 3580 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3581 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3582 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3583 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3584 3585 if (error == 0) 3586 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3587 3588 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3589 } 3590 3591 static int 3592 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3593 { 3594 struct sglist_seg segs[3]; 3595 struct sglist sg; 3596 struct { 3597 struct virtio_net_ctrl_hdr hdr __aligned(2); 3598 uint8_t pad1; 3599 struct virtio_net_ctrl_mq mq __aligned(2); 3600 uint8_t pad2; 3601 uint8_t ack; 3602 } s; 3603 int error; 3604 3605 error = 0; 3606 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3607 3608 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3609 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3610 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3611 s.ack = VIRTIO_NET_ERR; 3612 3613 sglist_init(&sg, nitems(segs), segs); 3614 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3615 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3616 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3617 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3618 3619 if (error == 0) 3620 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3621 3622 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3623 } 3624 3625 static int 3626 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3627 { 3628 struct sglist_seg segs[3]; 3629 struct sglist sg; 3630 struct { 3631 struct virtio_net_ctrl_hdr hdr __aligned(2); 3632 uint8_t pad1; 3633 uint8_t onoff; 3634 uint8_t pad2; 3635 uint8_t ack; 3636 } s; 3637 int error; 3638 3639 error = 0; 3640 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3641 3642 s.hdr.class = VIRTIO_NET_CTRL_RX; 3643 s.hdr.cmd = cmd; 3644 s.onoff = on; 3645 s.ack = VIRTIO_NET_ERR; 3646 3647 sglist_init(&sg, nitems(segs), segs); 3648 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3649 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3650 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3651 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3652 3653 if (error == 0) 3654 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3655 3656 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3657 } 3658 3659 static int 3660 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3661 { 3662 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3663 } 3664 3665 static int 3666 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3667 { 3668 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3669 } 3670 3671 static void 3672 vtnet_rx_filter(struct vtnet_softc *sc) 3673 { 3674 device_t dev; 3675 struct ifnet *ifp; 3676 3677 dev = sc->vtnet_dev; 3678 ifp = sc->vtnet_ifp; 3679 3680 VTNET_CORE_LOCK_ASSERT(sc); 3681 3682 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) { 3683 device_printf(dev, "cannot %s promiscuous mode\n", 3684 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3685 } 3686 3687 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) { 3688 device_printf(dev, "cannot %s all-multicast mode\n", 3689 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3690 } 3691 } 3692 3693 static u_int 3694 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3695 { 3696 struct vtnet_softc *sc = arg; 3697 3698 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3699 return (0); 3700 3701 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3702 bcopy(LLADDR(sdl), 3703 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3704 ETHER_ADDR_LEN); 3705 3706 return (1); 3707 } 3708 3709 static u_int 3710 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3711 { 3712 struct vtnet_mac_filter *filter = arg; 3713 3714 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3715 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3716 ETHER_ADDR_LEN); 3717 3718 return (1); 3719 } 3720 3721 static void 3722 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3723 { 3724 struct virtio_net_ctrl_hdr hdr __aligned(2); 3725 struct vtnet_mac_filter *filter; 3726 struct sglist_seg segs[4]; 3727 struct sglist sg; 3728 struct ifnet *ifp; 3729 bool promisc, allmulti; 3730 u_int ucnt, mcnt; 3731 int error; 3732 uint8_t ack; 3733 3734 ifp = sc->vtnet_ifp; 3735 filter = sc->vtnet_mac_filter; 3736 error = 0; 3737 3738 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3739 VTNET_CORE_LOCK_ASSERT(sc); 3740 3741 /* Unicast MAC addresses: */ 3742 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3743 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3744 3745 if (promisc) { 3746 ucnt = 0; 3747 if_printf(ifp, "more than %d MAC addresses assigned, " 3748 "falling back to promiscuous mode\n", 3749 VTNET_MAX_MAC_ENTRIES); 3750 } 3751 3752 /* Multicast MAC addresses: */ 3753 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3754 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3755 3756 if (allmulti) { 3757 mcnt = 0; 3758 if_printf(ifp, "more than %d multicast MAC addresses " 3759 "assigned, falling back to all-multicast mode\n", 3760 VTNET_MAX_MAC_ENTRIES); 3761 } 3762 3763 if (promisc && allmulti) 3764 goto out; 3765 3766 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3767 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3768 3769 hdr.class = VIRTIO_NET_CTRL_MAC; 3770 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3771 ack = VIRTIO_NET_ERR; 3772 3773 sglist_init(&sg, nitems(segs), segs); 3774 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3775 error |= sglist_append(&sg, &filter->vmf_unicast, 3776 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3777 error |= sglist_append(&sg, &filter->vmf_multicast, 3778 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3779 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3780 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3781 3782 if (error == 0) 3783 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3784 if (ack != VIRTIO_NET_OK) 3785 if_printf(ifp, "error setting host MAC filter table\n"); 3786 3787 out: 3788 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3789 if_printf(ifp, "cannot enable promiscuous mode\n"); 3790 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3791 if_printf(ifp, "cannot enable all-multicast mode\n"); 3792 } 3793 3794 static int 3795 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3796 { 3797 struct sglist_seg segs[3]; 3798 struct sglist sg; 3799 struct { 3800 struct virtio_net_ctrl_hdr hdr __aligned(2); 3801 uint8_t pad1; 3802 uint16_t tag __aligned(2); 3803 uint8_t pad2; 3804 uint8_t ack; 3805 } s; 3806 int error; 3807 3808 error = 0; 3809 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3810 3811 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3812 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3813 s.tag = vtnet_gtoh16(sc, tag); 3814 s.ack = VIRTIO_NET_ERR; 3815 3816 sglist_init(&sg, nitems(segs), segs); 3817 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3818 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3819 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3820 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3821 3822 if (error == 0) 3823 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3824 3825 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3826 } 3827 3828 static void 3829 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3830 { 3831 int i, bit; 3832 uint32_t w; 3833 uint16_t tag; 3834 3835 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3836 VTNET_CORE_LOCK_ASSERT(sc); 3837 3838 /* Enable the filter for each configured VLAN. */ 3839 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3840 w = sc->vtnet_vlan_filter[i]; 3841 3842 while ((bit = ffs(w) - 1) != -1) { 3843 w &= ~(1 << bit); 3844 tag = sizeof(w) * CHAR_BIT * i + bit; 3845 3846 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3847 device_printf(sc->vtnet_dev, 3848 "cannot enable VLAN %d filter\n", tag); 3849 } 3850 } 3851 } 3852 } 3853 3854 static void 3855 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3856 { 3857 struct ifnet *ifp; 3858 int idx, bit; 3859 3860 ifp = sc->vtnet_ifp; 3861 idx = (tag >> 5) & 0x7F; 3862 bit = tag & 0x1F; 3863 3864 if (tag == 0 || tag > 4095) 3865 return; 3866 3867 VTNET_CORE_LOCK(sc); 3868 3869 if (add) 3870 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3871 else 3872 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3873 3874 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3875 ifp->if_drv_flags & IFF_DRV_RUNNING && 3876 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3877 device_printf(sc->vtnet_dev, 3878 "cannot %s VLAN %d %s the host filter table\n", 3879 add ? "add" : "remove", tag, add ? "to" : "from"); 3880 } 3881 3882 VTNET_CORE_UNLOCK(sc); 3883 } 3884 3885 static void 3886 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3887 { 3888 3889 if (ifp->if_softc != arg) 3890 return; 3891 3892 vtnet_update_vlan_filter(arg, 1, tag); 3893 } 3894 3895 static void 3896 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3897 { 3898 3899 if (ifp->if_softc != arg) 3900 return; 3901 3902 vtnet_update_vlan_filter(arg, 0, tag); 3903 } 3904 3905 static void 3906 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3907 { 3908 struct ifnet *ifp; 3909 uint32_t speed; 3910 3911 ifp = sc->vtnet_ifp; 3912 3913 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3914 return; 3915 3916 /* BMV: Ignore duplex. */ 3917 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3918 offsetof(struct virtio_net_config, speed)); 3919 if (speed != UINT32_MAX) 3920 ifp->if_baudrate = IF_Mbps(speed); 3921 } 3922 3923 static int 3924 vtnet_is_link_up(struct vtnet_softc *sc) 3925 { 3926 uint16_t status; 3927 3928 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3929 return (1); 3930 3931 status = virtio_read_dev_config_2(sc->vtnet_dev, 3932 offsetof(struct virtio_net_config, status)); 3933 3934 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3935 } 3936 3937 static void 3938 vtnet_update_link_status(struct vtnet_softc *sc) 3939 { 3940 struct ifnet *ifp; 3941 int link; 3942 3943 ifp = sc->vtnet_ifp; 3944 VTNET_CORE_LOCK_ASSERT(sc); 3945 link = vtnet_is_link_up(sc); 3946 3947 /* Notify if the link status has changed. */ 3948 if (link != 0 && sc->vtnet_link_active == 0) { 3949 vtnet_update_speed_duplex(sc); 3950 sc->vtnet_link_active = 1; 3951 if_link_state_change(ifp, LINK_STATE_UP); 3952 } else if (link == 0 && sc->vtnet_link_active != 0) { 3953 sc->vtnet_link_active = 0; 3954 if_link_state_change(ifp, LINK_STATE_DOWN); 3955 } 3956 } 3957 3958 static int 3959 vtnet_ifmedia_upd(struct ifnet *ifp __unused) 3960 { 3961 return (EOPNOTSUPP); 3962 } 3963 3964 static void 3965 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3966 { 3967 struct vtnet_softc *sc; 3968 3969 sc = ifp->if_softc; 3970 3971 ifmr->ifm_status = IFM_AVALID; 3972 ifmr->ifm_active = IFM_ETHER; 3973 3974 VTNET_CORE_LOCK(sc); 3975 if (vtnet_is_link_up(sc) != 0) { 3976 ifmr->ifm_status |= IFM_ACTIVE; 3977 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3978 } else 3979 ifmr->ifm_active |= IFM_NONE; 3980 VTNET_CORE_UNLOCK(sc); 3981 } 3982 3983 static void 3984 vtnet_get_macaddr(struct vtnet_softc *sc) 3985 { 3986 3987 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3988 virtio_read_device_config_array(sc->vtnet_dev, 3989 offsetof(struct virtio_net_config, mac), 3990 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 3991 } else { 3992 /* Generate a random locally administered unicast address. */ 3993 sc->vtnet_hwaddr[0] = 0xB2; 3994 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3995 } 3996 } 3997 3998 static void 3999 vtnet_set_macaddr(struct vtnet_softc *sc) 4000 { 4001 device_t dev; 4002 int error; 4003 4004 dev = sc->vtnet_dev; 4005 4006 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4007 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4008 if (error) 4009 device_printf(dev, "unable to set MAC address\n"); 4010 return; 4011 } 4012 4013 /* MAC in config is read-only in modern VirtIO. */ 4014 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4015 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4016 virtio_write_dev_config_1(dev, 4017 offsetof(struct virtio_net_config, mac) + i, 4018 sc->vtnet_hwaddr[i]); 4019 } 4020 } 4021 } 4022 4023 static void 4024 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4025 { 4026 4027 /* Assign MAC address if it was generated. */ 4028 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4029 vtnet_set_macaddr(sc); 4030 } 4031 4032 static void 4033 vtnet_vlan_tag_remove(struct mbuf *m) 4034 { 4035 struct ether_vlan_header *evh; 4036 4037 evh = mtod(m, struct ether_vlan_header *); 4038 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4039 m->m_flags |= M_VLANTAG; 4040 4041 /* Strip the 802.1Q header. */ 4042 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4043 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4044 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4045 } 4046 4047 static void 4048 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4049 { 4050 int limit; 4051 4052 limit = vtnet_tunable_int(sc, "rx_process_limit", 4053 vtnet_rx_process_limit); 4054 if (limit < 0) 4055 limit = INT_MAX; 4056 sc->vtnet_rx_process_limit = limit; 4057 } 4058 4059 static void 4060 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4061 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4062 { 4063 struct sysctl_oid *node; 4064 struct sysctl_oid_list *list; 4065 struct vtnet_rxq_stats *stats; 4066 char namebuf[16]; 4067 4068 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4069 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4070 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4071 list = SYSCTL_CHILDREN(node); 4072 4073 stats = &rxq->vtnrx_stats; 4074 4075 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4076 &stats->vrxs_ipackets, "Receive packets"); 4077 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4078 &stats->vrxs_ibytes, "Receive bytes"); 4079 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4080 &stats->vrxs_iqdrops, "Receive drops"); 4081 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4082 &stats->vrxs_ierrors, "Receive errors"); 4083 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4084 &stats->vrxs_csum, "Receive checksum offloaded"); 4085 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4086 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4087 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4088 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4089 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4090 &stats->vrxs_rescheduled, 4091 "Receive interrupt handler rescheduled"); 4092 } 4093 4094 static void 4095 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4096 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4097 { 4098 struct sysctl_oid *node; 4099 struct sysctl_oid_list *list; 4100 struct vtnet_txq_stats *stats; 4101 char namebuf[16]; 4102 4103 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4104 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4105 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4106 list = SYSCTL_CHILDREN(node); 4107 4108 stats = &txq->vtntx_stats; 4109 4110 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4111 &stats->vtxs_opackets, "Transmit packets"); 4112 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4113 &stats->vtxs_obytes, "Transmit bytes"); 4114 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4115 &stats->vtxs_omcasts, "Transmit multicasts"); 4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4117 &stats->vtxs_csum, "Transmit checksum offloaded"); 4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4119 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4120 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4121 &stats->vtxs_rescheduled, 4122 "Transmit interrupt handler rescheduled"); 4123 } 4124 4125 static void 4126 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4127 { 4128 device_t dev; 4129 struct sysctl_ctx_list *ctx; 4130 struct sysctl_oid *tree; 4131 struct sysctl_oid_list *child; 4132 int i; 4133 4134 dev = sc->vtnet_dev; 4135 ctx = device_get_sysctl_ctx(dev); 4136 tree = device_get_sysctl_tree(dev); 4137 child = SYSCTL_CHILDREN(tree); 4138 4139 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4140 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4141 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4142 } 4143 } 4144 4145 static void 4146 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4147 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4148 { 4149 struct vtnet_statistics *stats; 4150 struct vtnet_rxq_stats rxaccum; 4151 struct vtnet_txq_stats txaccum; 4152 4153 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4154 4155 stats = &sc->vtnet_stats; 4156 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4157 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4158 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4159 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4160 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4161 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4162 4163 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4164 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4165 "Mbuf cluster allocation failures"); 4166 4167 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4168 CTLFLAG_RD, &stats->rx_frame_too_large, 4169 "Received frame larger than the mbuf chain"); 4170 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4171 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4172 "Enqueuing the replacement receive mbuf failed"); 4173 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4174 CTLFLAG_RD, &stats->rx_mergeable_failed, 4175 "Mergeable buffers receive failures"); 4176 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4177 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4178 "Received checksum offloaded buffer with unsupported " 4179 "Ethernet type"); 4180 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4181 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4182 "Received checksum offloaded buffer with incorrect IP protocol"); 4183 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4184 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4185 "Received checksum offloaded buffer with incorrect offset"); 4186 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4187 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4188 "Received checksum offloaded buffer with incorrect protocol"); 4189 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4190 CTLFLAG_RD, &stats->rx_csum_failed, 4191 "Received buffer checksum offload failed"); 4192 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4193 CTLFLAG_RD, &stats->rx_csum_offloaded, 4194 "Received buffer checksum offload succeeded"); 4195 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4196 CTLFLAG_RD, &stats->rx_task_rescheduled, 4197 "Times the receive interrupt task rescheduled itself"); 4198 4199 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4200 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4201 "Aborted transmit of checksum offloaded buffer with unknown " 4202 "Ethernet type"); 4203 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4204 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4205 "Aborted transmit of checksum offloaded buffer because mismatched " 4206 "protocols"); 4207 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4208 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4209 "Aborted transmit of TSO buffer with non TCP protocol"); 4210 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4211 CTLFLAG_RD, &stats->tx_tso_without_csum, 4212 "Aborted transmit of TSO buffer without TCP checksum offload"); 4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4214 CTLFLAG_RD, &stats->tx_defragged, 4215 "Transmit mbufs defragged"); 4216 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4217 CTLFLAG_RD, &stats->tx_defrag_failed, 4218 "Aborted transmit of buffer because defrag failed"); 4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4220 CTLFLAG_RD, &stats->tx_csum_offloaded, 4221 "Offloaded checksum of transmitted buffer"); 4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4223 CTLFLAG_RD, &stats->tx_tso_offloaded, 4224 "Segmentation offload of transmitted buffer"); 4225 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4226 CTLFLAG_RD, &stats->tx_task_rescheduled, 4227 "Times the transmit interrupt task rescheduled itself"); 4228 } 4229 4230 static void 4231 vtnet_setup_sysctl(struct vtnet_softc *sc) 4232 { 4233 device_t dev; 4234 struct sysctl_ctx_list *ctx; 4235 struct sysctl_oid *tree; 4236 struct sysctl_oid_list *child; 4237 4238 dev = sc->vtnet_dev; 4239 ctx = device_get_sysctl_ctx(dev); 4240 tree = device_get_sysctl_tree(dev); 4241 child = SYSCTL_CHILDREN(tree); 4242 4243 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4244 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4245 "Number of maximum supported virtqueue pairs"); 4246 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4247 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4248 "Number of requested virtqueue pairs"); 4249 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4250 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4251 "Number of active virtqueue pairs"); 4252 4253 vtnet_setup_stat_sysctl(ctx, child, sc); 4254 } 4255 4256 static void 4257 vtnet_load_tunables(struct vtnet_softc *sc) 4258 { 4259 4260 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4261 "lro_entry_count", vtnet_lro_entry_count); 4262 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4263 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4264 4265 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4266 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4267 } 4268 4269 static int 4270 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4271 { 4272 4273 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4274 } 4275 4276 static void 4277 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4278 { 4279 4280 virtqueue_disable_intr(rxq->vtnrx_vq); 4281 } 4282 4283 static int 4284 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4285 { 4286 struct virtqueue *vq; 4287 4288 vq = txq->vtntx_vq; 4289 4290 if (vtnet_txq_below_threshold(txq) != 0) 4291 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4292 4293 /* 4294 * The free count is above our threshold. Keep the Tx interrupt 4295 * disabled until the queue is fuller. 4296 */ 4297 return (0); 4298 } 4299 4300 static void 4301 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4302 { 4303 4304 virtqueue_disable_intr(txq->vtntx_vq); 4305 } 4306 4307 static void 4308 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4309 { 4310 struct vtnet_rxq *rxq; 4311 int i; 4312 4313 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4314 rxq = &sc->vtnet_rxqs[i]; 4315 if (vtnet_rxq_enable_intr(rxq) != 0) 4316 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4317 } 4318 } 4319 4320 static void 4321 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4322 { 4323 int i; 4324 4325 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4326 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4327 } 4328 4329 static void 4330 vtnet_enable_interrupts(struct vtnet_softc *sc) 4331 { 4332 4333 vtnet_enable_rx_interrupts(sc); 4334 vtnet_enable_tx_interrupts(sc); 4335 } 4336 4337 static void 4338 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4339 { 4340 int i; 4341 4342 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4343 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4344 } 4345 4346 static void 4347 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4348 { 4349 int i; 4350 4351 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4352 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4353 } 4354 4355 static void 4356 vtnet_disable_interrupts(struct vtnet_softc *sc) 4357 { 4358 4359 vtnet_disable_rx_interrupts(sc); 4360 vtnet_disable_tx_interrupts(sc); 4361 } 4362 4363 static int 4364 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4365 { 4366 char path[64]; 4367 4368 snprintf(path, sizeof(path), 4369 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4370 TUNABLE_INT_FETCH(path, &def); 4371 4372 return (def); 4373 } 4374 4375 #ifdef DEBUGNET 4376 static void 4377 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4378 { 4379 struct vtnet_softc *sc; 4380 4381 sc = if_getsoftc(ifp); 4382 4383 VTNET_CORE_LOCK(sc); 4384 *nrxr = sc->vtnet_req_vq_pairs; 4385 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4386 *clsize = sc->vtnet_rx_clustersz; 4387 VTNET_CORE_UNLOCK(sc); 4388 } 4389 4390 static void 4391 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4392 { 4393 } 4394 4395 static int 4396 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4397 { 4398 struct vtnet_softc *sc; 4399 struct vtnet_txq *txq; 4400 int error; 4401 4402 sc = if_getsoftc(ifp); 4403 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4404 IFF_DRV_RUNNING) 4405 return (EBUSY); 4406 4407 txq = &sc->vtnet_txqs[0]; 4408 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4409 if (error == 0) 4410 (void)vtnet_txq_notify(txq); 4411 return (error); 4412 } 4413 4414 static int 4415 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4416 { 4417 struct vtnet_softc *sc; 4418 int i; 4419 4420 sc = if_getsoftc(ifp); 4421 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4422 IFF_DRV_RUNNING) 4423 return (EBUSY); 4424 4425 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4426 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4427 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4428 return (0); 4429 } 4430 #endif /* DEBUGNET */ 4431