1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/eventhandler.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/sockio.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 #include <sys/socket.h> 43 #include <sys/sysctl.h> 44 #include <sys/random.h> 45 #include <sys/sglist.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/taskqueue.h> 49 #include <sys/smp.h> 50 #include <machine/smp.h> 51 52 #include <vm/uma.h> 53 54 #include <net/debugnet.h> 55 #include <net/ethernet.h> 56 #include <net/pfil.h> 57 #include <net/if.h> 58 #include <net/if_var.h> 59 #include <net/if_arp.h> 60 #include <net/if_dl.h> 61 #include <net/if_types.h> 62 #include <net/if_media.h> 63 #include <net/if_vlan_var.h> 64 65 #include <net/bpf.h> 66 67 #include <netinet/in_systm.h> 68 #include <netinet/in.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip6.h> 71 #include <netinet6/ip6_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/tcp.h> 74 #include <netinet/tcp_lro.h> 75 76 #include <machine/bus.h> 77 #include <machine/resource.h> 78 #include <sys/bus.h> 79 #include <sys/rman.h> 80 81 #include <dev/virtio/virtio.h> 82 #include <dev/virtio/virtqueue.h> 83 #include <dev/virtio/network/virtio_net.h> 84 #include <dev/virtio/network/if_vtnetvar.h> 85 #include "virtio_if.h" 86 87 #include "opt_inet.h" 88 #include "opt_inet6.h" 89 90 #if defined(INET) || defined(INET6) 91 #include <machine/in_cksum.h> 92 #endif 93 94 static int vtnet_modevent(module_t, int, void *); 95 96 static int vtnet_probe(device_t); 97 static int vtnet_attach(device_t); 98 static int vtnet_detach(device_t); 99 static int vtnet_suspend(device_t); 100 static int vtnet_resume(device_t); 101 static int vtnet_shutdown(device_t); 102 static int vtnet_attach_completed(device_t); 103 static int vtnet_config_change(device_t); 104 105 static int vtnet_negotiate_features(struct vtnet_softc *); 106 static int vtnet_setup_features(struct vtnet_softc *); 107 static int vtnet_init_rxq(struct vtnet_softc *, int); 108 static int vtnet_init_txq(struct vtnet_softc *, int); 109 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 110 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 111 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 112 static void vtnet_free_rx_filters(struct vtnet_softc *); 113 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 114 static int vtnet_alloc_interface(struct vtnet_softc *); 115 static int vtnet_setup_interface(struct vtnet_softc *); 116 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 117 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 118 static int vtnet_ioctl_multi(struct vtnet_softc *); 119 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 120 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 121 static uint64_t vtnet_get_counter(struct ifnet *, ift_counter); 122 123 static int vtnet_rxq_populate(struct vtnet_rxq *); 124 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 125 static struct mbuf * 126 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 127 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 128 struct mbuf *, int); 129 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 130 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 131 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 132 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 133 uint16_t, int, struct virtio_net_hdr *); 134 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 135 uint16_t, int, struct virtio_net_hdr *); 136 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 137 struct virtio_net_hdr *); 138 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 139 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 140 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 141 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 142 struct virtio_net_hdr *); 143 static int vtnet_rxq_eof(struct vtnet_rxq *); 144 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 145 static void vtnet_rx_vq_intr(void *); 146 static void vtnet_rxq_tq_intr(void *, int); 147 148 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 149 static int vtnet_txq_below_threshold(struct vtnet_txq *); 150 static int vtnet_txq_notify(struct vtnet_txq *); 151 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 152 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 153 int *, int *, int *); 154 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 155 int, struct virtio_net_hdr *); 156 static struct mbuf * 157 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 158 struct virtio_net_hdr *); 159 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 160 struct vtnet_tx_header *); 161 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 162 #ifdef VTNET_LEGACY_TX 163 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 164 static void vtnet_start(struct ifnet *); 165 #else 166 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 167 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 168 static void vtnet_txq_tq_deferred(void *, int); 169 #endif 170 static void vtnet_txq_start(struct vtnet_txq *); 171 static void vtnet_txq_tq_intr(void *, int); 172 static int vtnet_txq_eof(struct vtnet_txq *); 173 static void vtnet_tx_vq_intr(void *); 174 static void vtnet_tx_start_all(struct vtnet_softc *); 175 176 #ifndef VTNET_LEGACY_TX 177 static void vtnet_qflush(struct ifnet *); 178 #endif 179 180 static int vtnet_watchdog(struct vtnet_txq *); 181 static void vtnet_accum_stats(struct vtnet_softc *, 182 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 183 static void vtnet_tick(void *); 184 185 static void vtnet_start_taskqueues(struct vtnet_softc *); 186 static void vtnet_free_taskqueues(struct vtnet_softc *); 187 static void vtnet_drain_taskqueues(struct vtnet_softc *); 188 189 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 190 static void vtnet_stop_rendezvous(struct vtnet_softc *); 191 static void vtnet_stop(struct vtnet_softc *); 192 static int vtnet_virtio_reinit(struct vtnet_softc *); 193 static void vtnet_init_rx_filters(struct vtnet_softc *); 194 static int vtnet_init_rx_queues(struct vtnet_softc *); 195 static int vtnet_init_tx_queues(struct vtnet_softc *); 196 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 197 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 198 static void vtnet_update_rx_offloads(struct vtnet_softc *); 199 static int vtnet_reinit(struct vtnet_softc *); 200 static void vtnet_init_locked(struct vtnet_softc *, int); 201 static void vtnet_init(void *); 202 203 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 204 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 205 struct sglist *, int, int); 206 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 207 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 208 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 209 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 210 static int vtnet_set_promisc(struct vtnet_softc *, bool); 211 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 212 static void vtnet_rx_filter(struct vtnet_softc *); 213 static void vtnet_rx_filter_mac(struct vtnet_softc *); 214 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 215 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 216 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 217 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 218 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 219 220 static void vtnet_update_speed_duplex(struct vtnet_softc *); 221 static int vtnet_is_link_up(struct vtnet_softc *); 222 static void vtnet_update_link_status(struct vtnet_softc *); 223 static int vtnet_ifmedia_upd(struct ifnet *); 224 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 225 static void vtnet_get_macaddr(struct vtnet_softc *); 226 static void vtnet_set_macaddr(struct vtnet_softc *); 227 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 228 static void vtnet_vlan_tag_remove(struct mbuf *); 229 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 230 231 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 232 struct sysctl_oid_list *, struct vtnet_rxq *); 233 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 234 struct sysctl_oid_list *, struct vtnet_txq *); 235 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 236 static void vtnet_load_tunables(struct vtnet_softc *); 237 static void vtnet_setup_sysctl(struct vtnet_softc *); 238 239 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 240 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 241 static int vtnet_txq_enable_intr(struct vtnet_txq *); 242 static void vtnet_txq_disable_intr(struct vtnet_txq *); 243 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 244 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 245 static void vtnet_enable_interrupts(struct vtnet_softc *); 246 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 247 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 248 static void vtnet_disable_interrupts(struct vtnet_softc *); 249 250 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 251 252 DEBUGNET_DEFINE(vtnet); 253 254 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 255 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 256 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 257 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 258 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 259 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 260 261 /* Tunables. */ 262 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 263 "VirtIO Net driver parameters"); 264 265 static int vtnet_csum_disable = 0; 266 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 267 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 268 269 static int vtnet_fixup_needs_csum = 0; 270 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 271 &vtnet_fixup_needs_csum, 0, 272 "Calculate valid checksum for NEEDS_CSUM packets"); 273 274 static int vtnet_tso_disable = 0; 275 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 276 &vtnet_tso_disable, 0, "Disables TSO"); 277 278 static int vtnet_lro_disable = 0; 279 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 280 &vtnet_lro_disable, 0, "Disables hardware LRO"); 281 282 static int vtnet_mq_disable = 0; 283 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 284 &vtnet_mq_disable, 0, "Disables multiqueue support"); 285 286 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 287 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 288 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 289 290 static int vtnet_tso_maxlen = IP_MAXPACKET; 291 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 292 &vtnet_tso_maxlen, 0, "TSO burst limit"); 293 294 static int vtnet_rx_process_limit = 1024; 295 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 296 &vtnet_rx_process_limit, 0, 297 "Number of RX segments processed in one pass"); 298 299 static int vtnet_lro_entry_count = 128; 300 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 301 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 302 303 /* Enable sorted LRO, and the depth of the mbuf queue. */ 304 static int vtnet_lro_mbufq_depth = 0; 305 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 306 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 307 308 static uma_zone_t vtnet_tx_header_zone; 309 310 static struct virtio_feature_desc vtnet_feature_desc[] = { 311 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 312 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 313 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 314 { VIRTIO_NET_F_MAC, "MAC" }, 315 { VIRTIO_NET_F_GSO, "TxGSO" }, 316 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 317 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 318 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 319 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 320 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 321 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 322 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 323 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 324 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 325 { VIRTIO_NET_F_STATUS, "Status" }, 326 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 327 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 328 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 329 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 330 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 331 { VIRTIO_NET_F_MQ, "Multiqueue" }, 332 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 333 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 334 335 { 0, NULL } 336 }; 337 338 static device_method_t vtnet_methods[] = { 339 /* Device methods. */ 340 DEVMETHOD(device_probe, vtnet_probe), 341 DEVMETHOD(device_attach, vtnet_attach), 342 DEVMETHOD(device_detach, vtnet_detach), 343 DEVMETHOD(device_suspend, vtnet_suspend), 344 DEVMETHOD(device_resume, vtnet_resume), 345 DEVMETHOD(device_shutdown, vtnet_shutdown), 346 347 /* VirtIO methods. */ 348 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 349 DEVMETHOD(virtio_config_change, vtnet_config_change), 350 351 DEVMETHOD_END 352 }; 353 354 #ifdef DEV_NETMAP 355 #include <dev/netmap/if_vtnet_netmap.h> 356 #endif 357 358 static driver_t vtnet_driver = { 359 .name = "vtnet", 360 .methods = vtnet_methods, 361 .size = sizeof(struct vtnet_softc) 362 }; 363 static devclass_t vtnet_devclass; 364 365 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_devclass, 366 vtnet_modevent, 0); 367 MODULE_VERSION(vtnet, 1); 368 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 369 #ifdef DEV_NETMAP 370 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 371 #endif 372 373 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 374 375 static int 376 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 377 { 378 int error = 0; 379 static int loaded = 0; 380 381 switch (type) { 382 case MOD_LOAD: 383 if (loaded++ == 0) { 384 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 385 sizeof(struct vtnet_tx_header), 386 NULL, NULL, NULL, NULL, 0, 0); 387 #ifdef DEBUGNET 388 /* 389 * We need to allocate from this zone in the transmit path, so ensure 390 * that we have at least one item per header available. 391 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 392 * buckets 393 */ 394 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 395 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 396 #endif 397 } 398 break; 399 case MOD_QUIESCE: 400 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 401 error = EBUSY; 402 break; 403 case MOD_UNLOAD: 404 if (--loaded == 0) { 405 uma_zdestroy(vtnet_tx_header_zone); 406 vtnet_tx_header_zone = NULL; 407 } 408 break; 409 case MOD_SHUTDOWN: 410 break; 411 default: 412 error = EOPNOTSUPP; 413 break; 414 } 415 416 return (error); 417 } 418 419 static int 420 vtnet_probe(device_t dev) 421 { 422 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 423 } 424 425 static int 426 vtnet_attach(device_t dev) 427 { 428 struct vtnet_softc *sc; 429 int error; 430 431 sc = device_get_softc(dev); 432 sc->vtnet_dev = dev; 433 virtio_set_feature_desc(dev, vtnet_feature_desc); 434 435 VTNET_CORE_LOCK_INIT(sc); 436 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 437 vtnet_load_tunables(sc); 438 439 error = vtnet_alloc_interface(sc); 440 if (error) { 441 device_printf(dev, "cannot allocate interface\n"); 442 goto fail; 443 } 444 445 vtnet_setup_sysctl(sc); 446 447 error = vtnet_setup_features(sc); 448 if (error) { 449 device_printf(dev, "cannot setup features\n"); 450 goto fail; 451 } 452 453 error = vtnet_alloc_rx_filters(sc); 454 if (error) { 455 device_printf(dev, "cannot allocate Rx filters\n"); 456 goto fail; 457 } 458 459 error = vtnet_alloc_rxtx_queues(sc); 460 if (error) { 461 device_printf(dev, "cannot allocate queues\n"); 462 goto fail; 463 } 464 465 error = vtnet_alloc_virtqueues(sc); 466 if (error) { 467 device_printf(dev, "cannot allocate virtqueues\n"); 468 goto fail; 469 } 470 471 error = vtnet_setup_interface(sc); 472 if (error) { 473 device_printf(dev, "cannot setup interface\n"); 474 goto fail; 475 } 476 477 error = virtio_setup_intr(dev, INTR_TYPE_NET); 478 if (error) { 479 device_printf(dev, "cannot setup interrupts\n"); 480 ether_ifdetach(sc->vtnet_ifp); 481 goto fail; 482 } 483 484 #ifdef DEV_NETMAP 485 vtnet_netmap_attach(sc); 486 #endif 487 vtnet_start_taskqueues(sc); 488 489 fail: 490 if (error) 491 vtnet_detach(dev); 492 493 return (error); 494 } 495 496 static int 497 vtnet_detach(device_t dev) 498 { 499 struct vtnet_softc *sc; 500 struct ifnet *ifp; 501 502 sc = device_get_softc(dev); 503 ifp = sc->vtnet_ifp; 504 505 if (device_is_attached(dev)) { 506 VTNET_CORE_LOCK(sc); 507 vtnet_stop(sc); 508 VTNET_CORE_UNLOCK(sc); 509 510 callout_drain(&sc->vtnet_tick_ch); 511 vtnet_drain_taskqueues(sc); 512 513 ether_ifdetach(ifp); 514 } 515 516 #ifdef DEV_NETMAP 517 netmap_detach(ifp); 518 #endif 519 520 vtnet_free_taskqueues(sc); 521 522 if (sc->vtnet_vlan_attach != NULL) { 523 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 524 sc->vtnet_vlan_attach = NULL; 525 } 526 if (sc->vtnet_vlan_detach != NULL) { 527 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 528 sc->vtnet_vlan_detach = NULL; 529 } 530 531 ifmedia_removeall(&sc->vtnet_media); 532 533 if (ifp != NULL) { 534 if_free(ifp); 535 sc->vtnet_ifp = NULL; 536 } 537 538 vtnet_free_rxtx_queues(sc); 539 vtnet_free_rx_filters(sc); 540 541 if (sc->vtnet_ctrl_vq != NULL) 542 vtnet_free_ctrl_vq(sc); 543 544 VTNET_CORE_LOCK_DESTROY(sc); 545 546 return (0); 547 } 548 549 static int 550 vtnet_suspend(device_t dev) 551 { 552 struct vtnet_softc *sc; 553 554 sc = device_get_softc(dev); 555 556 VTNET_CORE_LOCK(sc); 557 vtnet_stop(sc); 558 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 559 VTNET_CORE_UNLOCK(sc); 560 561 return (0); 562 } 563 564 static int 565 vtnet_resume(device_t dev) 566 { 567 struct vtnet_softc *sc; 568 struct ifnet *ifp; 569 570 sc = device_get_softc(dev); 571 ifp = sc->vtnet_ifp; 572 573 VTNET_CORE_LOCK(sc); 574 if (ifp->if_flags & IFF_UP) 575 vtnet_init_locked(sc, 0); 576 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 577 VTNET_CORE_UNLOCK(sc); 578 579 return (0); 580 } 581 582 static int 583 vtnet_shutdown(device_t dev) 584 { 585 /* 586 * Suspend already does all of what we need to 587 * do here; we just never expect to be resumed. 588 */ 589 return (vtnet_suspend(dev)); 590 } 591 592 static int 593 vtnet_attach_completed(device_t dev) 594 { 595 struct vtnet_softc *sc; 596 597 sc = device_get_softc(dev); 598 599 VTNET_CORE_LOCK(sc); 600 vtnet_attached_set_macaddr(sc); 601 VTNET_CORE_UNLOCK(sc); 602 603 return (0); 604 } 605 606 static int 607 vtnet_config_change(device_t dev) 608 { 609 struct vtnet_softc *sc; 610 611 sc = device_get_softc(dev); 612 613 VTNET_CORE_LOCK(sc); 614 vtnet_update_link_status(sc); 615 if (sc->vtnet_link_active != 0) 616 vtnet_tx_start_all(sc); 617 VTNET_CORE_UNLOCK(sc); 618 619 return (0); 620 } 621 622 static int 623 vtnet_negotiate_features(struct vtnet_softc *sc) 624 { 625 device_t dev; 626 uint64_t features, negotiated_features; 627 int no_csum; 628 629 dev = sc->vtnet_dev; 630 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 631 VTNET_LEGACY_FEATURES; 632 633 /* 634 * TSO and LRO are only available when their corresponding checksum 635 * offload feature is also negotiated. 636 */ 637 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 638 if (no_csum) 639 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 640 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 641 features &= ~VTNET_TSO_FEATURES; 642 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 643 features &= ~VTNET_LRO_FEATURES; 644 645 #ifndef VTNET_LEGACY_TX 646 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 647 features &= ~VIRTIO_NET_F_MQ; 648 #else 649 features &= ~VIRTIO_NET_F_MQ; 650 #endif 651 652 negotiated_features = virtio_negotiate_features(dev, features); 653 654 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 655 uint16_t mtu; 656 657 mtu = virtio_read_dev_config_2(dev, 658 offsetof(struct virtio_net_config, mtu)); 659 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 660 device_printf(dev, "Invalid MTU value: %d. " 661 "MTU feature disabled.\n", mtu); 662 features &= ~VIRTIO_NET_F_MTU; 663 negotiated_features = 664 virtio_negotiate_features(dev, features); 665 } 666 } 667 668 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 669 uint16_t npairs; 670 671 npairs = virtio_read_dev_config_2(dev, 672 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 673 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 674 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 675 device_printf(dev, "Invalid max_virtqueue_pairs value: " 676 "%d. Multiqueue feature disabled.\n", npairs); 677 features &= ~VIRTIO_NET_F_MQ; 678 negotiated_features = 679 virtio_negotiate_features(dev, features); 680 } 681 } 682 683 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 684 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 685 /* 686 * LRO without mergeable buffers requires special care. This 687 * is not ideal because every receive buffer must be large 688 * enough to hold the maximum TCP packet, the Ethernet header, 689 * and the header. This requires up to 34 descriptors with 690 * MCLBYTES clusters. If we do not have indirect descriptors, 691 * LRO is disabled since the virtqueue will not contain very 692 * many receive buffers. 693 */ 694 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 695 device_printf(dev, 696 "Host LRO disabled since both mergeable buffers " 697 "and indirect descriptors were not negotiated\n"); 698 features &= ~VTNET_LRO_FEATURES; 699 negotiated_features = 700 virtio_negotiate_features(dev, features); 701 } else 702 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 703 } 704 705 sc->vtnet_features = negotiated_features; 706 sc->vtnet_negotiated_features = negotiated_features; 707 708 return (virtio_finalize_features(dev)); 709 } 710 711 static int 712 vtnet_setup_features(struct vtnet_softc *sc) 713 { 714 device_t dev; 715 int error; 716 717 dev = sc->vtnet_dev; 718 719 error = vtnet_negotiate_features(sc); 720 if (error) 721 return (error); 722 723 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 724 sc->vtnet_flags |= VTNET_FLAG_MODERN; 725 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 726 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 727 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 728 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 729 730 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 731 /* This feature should always be negotiated. */ 732 sc->vtnet_flags |= VTNET_FLAG_MAC; 733 } 734 735 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 736 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 737 offsetof(struct virtio_net_config, mtu)); 738 } else 739 sc->vtnet_max_mtu = VTNET_MAX_MTU; 740 741 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 742 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 743 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 744 } else if (vtnet_modern(sc)) { 745 /* This is identical to the mergeable header. */ 746 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 747 } else 748 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 749 750 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 751 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 752 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 753 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 754 else 755 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 756 757 /* 758 * Favor "hardware" LRO if negotiated, but support software LRO as 759 * a fallback; there is usually little benefit (or worse) with both. 760 */ 761 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 762 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 763 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 764 765 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 766 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 767 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 768 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 769 else 770 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 771 772 sc->vtnet_req_vq_pairs = 1; 773 sc->vtnet_max_vq_pairs = 1; 774 775 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 776 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 777 778 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 779 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 780 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 781 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 782 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 783 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 784 785 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 786 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 787 offsetof(struct virtio_net_config, 788 max_virtqueue_pairs)); 789 } 790 } 791 792 if (sc->vtnet_max_vq_pairs > 1) { 793 int req; 794 795 /* 796 * Limit the maximum number of requested queue pairs to the 797 * number of CPUs and the configured maximum. 798 */ 799 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 800 if (req < 0) 801 req = 1; 802 if (req == 0) 803 req = mp_ncpus; 804 if (req > sc->vtnet_max_vq_pairs) 805 req = sc->vtnet_max_vq_pairs; 806 if (req > mp_ncpus) 807 req = mp_ncpus; 808 if (req > 1) { 809 sc->vtnet_req_vq_pairs = req; 810 sc->vtnet_flags |= VTNET_FLAG_MQ; 811 } 812 } 813 814 return (0); 815 } 816 817 static int 818 vtnet_init_rxq(struct vtnet_softc *sc, int id) 819 { 820 struct vtnet_rxq *rxq; 821 822 rxq = &sc->vtnet_rxqs[id]; 823 824 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 825 device_get_nameunit(sc->vtnet_dev), id); 826 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 827 828 rxq->vtnrx_sc = sc; 829 rxq->vtnrx_id = id; 830 831 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 832 if (rxq->vtnrx_sg == NULL) 833 return (ENOMEM); 834 835 #if defined(INET) || defined(INET6) 836 if (vtnet_software_lro(sc)) { 837 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 838 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 839 return (ENOMEM); 840 } 841 #endif 842 843 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 844 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 845 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 846 847 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 848 } 849 850 static int 851 vtnet_init_txq(struct vtnet_softc *sc, int id) 852 { 853 struct vtnet_txq *txq; 854 855 txq = &sc->vtnet_txqs[id]; 856 857 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 858 device_get_nameunit(sc->vtnet_dev), id); 859 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 860 861 txq->vtntx_sc = sc; 862 txq->vtntx_id = id; 863 864 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 865 if (txq->vtntx_sg == NULL) 866 return (ENOMEM); 867 868 #ifndef VTNET_LEGACY_TX 869 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 870 M_NOWAIT, &txq->vtntx_mtx); 871 if (txq->vtntx_br == NULL) 872 return (ENOMEM); 873 874 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 875 #endif 876 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 877 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 878 taskqueue_thread_enqueue, &txq->vtntx_tq); 879 if (txq->vtntx_tq == NULL) 880 return (ENOMEM); 881 882 return (0); 883 } 884 885 static int 886 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 887 { 888 int i, npairs, error; 889 890 npairs = sc->vtnet_max_vq_pairs; 891 892 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 893 M_NOWAIT | M_ZERO); 894 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 895 M_NOWAIT | M_ZERO); 896 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 897 return (ENOMEM); 898 899 for (i = 0; i < npairs; i++) { 900 error = vtnet_init_rxq(sc, i); 901 if (error) 902 return (error); 903 error = vtnet_init_txq(sc, i); 904 if (error) 905 return (error); 906 } 907 908 vtnet_set_rx_process_limit(sc); 909 vtnet_setup_queue_sysctl(sc); 910 911 return (0); 912 } 913 914 static void 915 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 916 { 917 918 rxq->vtnrx_sc = NULL; 919 rxq->vtnrx_id = -1; 920 921 #if defined(INET) || defined(INET6) 922 tcp_lro_free(&rxq->vtnrx_lro); 923 #endif 924 925 if (rxq->vtnrx_sg != NULL) { 926 sglist_free(rxq->vtnrx_sg); 927 rxq->vtnrx_sg = NULL; 928 } 929 930 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 931 mtx_destroy(&rxq->vtnrx_mtx); 932 } 933 934 static void 935 vtnet_destroy_txq(struct vtnet_txq *txq) 936 { 937 938 txq->vtntx_sc = NULL; 939 txq->vtntx_id = -1; 940 941 if (txq->vtntx_sg != NULL) { 942 sglist_free(txq->vtntx_sg); 943 txq->vtntx_sg = NULL; 944 } 945 946 #ifndef VTNET_LEGACY_TX 947 if (txq->vtntx_br != NULL) { 948 buf_ring_free(txq->vtntx_br, M_DEVBUF); 949 txq->vtntx_br = NULL; 950 } 951 #endif 952 953 if (mtx_initialized(&txq->vtntx_mtx) != 0) 954 mtx_destroy(&txq->vtntx_mtx); 955 } 956 957 static void 958 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 959 { 960 int i; 961 962 if (sc->vtnet_rxqs != NULL) { 963 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 964 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 965 free(sc->vtnet_rxqs, M_DEVBUF); 966 sc->vtnet_rxqs = NULL; 967 } 968 969 if (sc->vtnet_txqs != NULL) { 970 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 971 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 972 free(sc->vtnet_txqs, M_DEVBUF); 973 sc->vtnet_txqs = NULL; 974 } 975 } 976 977 static int 978 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 979 { 980 981 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 982 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 983 M_DEVBUF, M_NOWAIT | M_ZERO); 984 if (sc->vtnet_mac_filter == NULL) 985 return (ENOMEM); 986 } 987 988 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 989 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 990 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 991 if (sc->vtnet_vlan_filter == NULL) 992 return (ENOMEM); 993 } 994 995 return (0); 996 } 997 998 static void 999 vtnet_free_rx_filters(struct vtnet_softc *sc) 1000 { 1001 1002 if (sc->vtnet_mac_filter != NULL) { 1003 free(sc->vtnet_mac_filter, M_DEVBUF); 1004 sc->vtnet_mac_filter = NULL; 1005 } 1006 1007 if (sc->vtnet_vlan_filter != NULL) { 1008 free(sc->vtnet_vlan_filter, M_DEVBUF); 1009 sc->vtnet_vlan_filter = NULL; 1010 } 1011 } 1012 1013 static int 1014 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1015 { 1016 device_t dev; 1017 struct vq_alloc_info *info; 1018 struct vtnet_rxq *rxq; 1019 struct vtnet_txq *txq; 1020 int i, idx, flags, nvqs, error; 1021 1022 dev = sc->vtnet_dev; 1023 flags = 0; 1024 1025 nvqs = sc->vtnet_max_vq_pairs * 2; 1026 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1027 nvqs++; 1028 1029 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1030 if (info == NULL) 1031 return (ENOMEM); 1032 1033 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1034 rxq = &sc->vtnet_rxqs[i]; 1035 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1036 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1037 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1038 1039 txq = &sc->vtnet_txqs[i]; 1040 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1041 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1042 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1043 } 1044 1045 /* These queues will not be used so allocate the minimum resources. */ 1046 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1047 rxq = &sc->vtnet_rxqs[i]; 1048 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1049 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1050 1051 txq = &sc->vtnet_txqs[i]; 1052 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1053 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1054 } 1055 1056 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1057 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1058 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1059 } 1060 1061 /* 1062 * TODO: Enable interrupt binding if this is multiqueue. This will 1063 * only matter when per-virtqueue MSIX is available. 1064 */ 1065 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1066 flags |= 0; 1067 1068 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1069 free(info, M_TEMP); 1070 1071 return (error); 1072 } 1073 1074 static int 1075 vtnet_alloc_interface(struct vtnet_softc *sc) 1076 { 1077 device_t dev; 1078 struct ifnet *ifp; 1079 1080 dev = sc->vtnet_dev; 1081 1082 ifp = if_alloc(IFT_ETHER); 1083 if (ifp == NULL) 1084 return (ENOMEM); 1085 1086 sc->vtnet_ifp = ifp; 1087 ifp->if_softc = sc; 1088 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1089 1090 return (0); 1091 } 1092 1093 static int 1094 vtnet_setup_interface(struct vtnet_softc *sc) 1095 { 1096 device_t dev; 1097 struct pfil_head_args pa; 1098 struct ifnet *ifp; 1099 1100 dev = sc->vtnet_dev; 1101 ifp = sc->vtnet_ifp; 1102 1103 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST | 1104 IFF_KNOWSEPOCH; 1105 ifp->if_baudrate = IF_Gbps(10); 1106 ifp->if_init = vtnet_init; 1107 ifp->if_ioctl = vtnet_ioctl; 1108 ifp->if_get_counter = vtnet_get_counter; 1109 #ifndef VTNET_LEGACY_TX 1110 ifp->if_transmit = vtnet_txq_mq_start; 1111 ifp->if_qflush = vtnet_qflush; 1112 #else 1113 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1114 ifp->if_start = vtnet_start; 1115 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1); 1116 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1; 1117 IFQ_SET_READY(&ifp->if_snd); 1118 #endif 1119 1120 vtnet_get_macaddr(sc); 1121 1122 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1123 ifp->if_capabilities |= IFCAP_LINKSTATE; 1124 1125 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1126 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1127 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1128 1129 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1130 int gso; 1131 1132 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6; 1133 1134 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1135 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1136 ifp->if_capabilities |= IFCAP_TSO4; 1137 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1138 ifp->if_capabilities |= IFCAP_TSO6; 1139 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1140 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1141 1142 if (ifp->if_capabilities & (IFCAP_TSO4 | IFCAP_TSO6)) { 1143 int tso_maxlen; 1144 1145 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 1146 1147 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1148 vtnet_tso_maxlen); 1149 ifp->if_hw_tsomax = tso_maxlen - 1150 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN); 1151 ifp->if_hw_tsomaxsegcount = sc->vtnet_tx_nsegs - 1; 1152 ifp->if_hw_tsomaxsegsize = PAGE_SIZE; 1153 } 1154 } 1155 1156 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1157 ifp->if_capabilities |= IFCAP_RXCSUM; 1158 #ifdef notyet 1159 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1160 ifp->if_capabilities |= IFCAP_RXCSUM_IPV6; 1161 #endif 1162 1163 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1164 vtnet_fixup_needs_csum) != 0) 1165 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1166 1167 /* Support either "hardware" or software LRO. */ 1168 ifp->if_capabilities |= IFCAP_LRO; 1169 } 1170 1171 if (ifp->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1172 /* 1173 * VirtIO does not support VLAN tagging, but we can fake 1174 * it by inserting and removing the 802.1Q header during 1175 * transmit and receive. We are then able to do checksum 1176 * offloading of VLAN frames. 1177 */ 1178 ifp->if_capabilities |= 1179 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 1180 } 1181 1182 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1183 ifp->if_capabilities |= IFCAP_JUMBO_MTU; 1184 ifp->if_capabilities |= IFCAP_VLAN_MTU; 1185 1186 /* 1187 * Capabilities after here are not enabled by default. 1188 */ 1189 ifp->if_capenable = ifp->if_capabilities; 1190 1191 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1192 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 1193 1194 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1195 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1196 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1197 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1198 } 1199 1200 ether_ifattach(ifp, sc->vtnet_hwaddr); 1201 1202 /* Tell the upper layer(s) we support long frames. */ 1203 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 1204 1205 DEBUGNET_SET(ifp, vtnet); 1206 1207 pa.pa_version = PFIL_VERSION; 1208 pa.pa_flags = PFIL_IN; 1209 pa.pa_type = PFIL_TYPE_ETHERNET; 1210 pa.pa_headname = ifp->if_xname; 1211 sc->vtnet_pfil = pfil_head_register(&pa); 1212 1213 return (0); 1214 } 1215 1216 static int 1217 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1218 { 1219 int framesz; 1220 1221 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1222 return (MJUMPAGESIZE); 1223 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1224 return (MCLBYTES); 1225 1226 /* 1227 * Try to scale the receive mbuf cluster size from the MTU. We 1228 * could also use the VQ size to influence the selected size, 1229 * but that would only matter for very small queues. 1230 */ 1231 if (vtnet_modern(sc)) { 1232 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1233 framesz = sizeof(struct virtio_net_hdr_v1); 1234 } else 1235 framesz = sizeof(struct vtnet_rx_header); 1236 framesz += sizeof(struct ether_vlan_header) + mtu; 1237 1238 if (framesz <= MCLBYTES) 1239 return (MCLBYTES); 1240 else if (framesz <= MJUMPAGESIZE) 1241 return (MJUMPAGESIZE); 1242 else if (framesz <= MJUM9BYTES) 1243 return (MJUM9BYTES); 1244 1245 /* Sane default; avoid 16KB clusters. */ 1246 return (MCLBYTES); 1247 } 1248 1249 static int 1250 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1251 { 1252 struct ifnet *ifp; 1253 int clustersz; 1254 1255 ifp = sc->vtnet_ifp; 1256 VTNET_CORE_LOCK_ASSERT(sc); 1257 1258 if (ifp->if_mtu == mtu) 1259 return (0); 1260 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1261 return (EINVAL); 1262 1263 ifp->if_mtu = mtu; 1264 clustersz = vtnet_rx_cluster_size(sc, mtu); 1265 1266 if (clustersz != sc->vtnet_rx_clustersz && 1267 ifp->if_drv_flags & IFF_DRV_RUNNING) { 1268 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1269 vtnet_init_locked(sc, 0); 1270 } 1271 1272 return (0); 1273 } 1274 1275 static int 1276 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1277 { 1278 struct ifnet *ifp; 1279 int drv_running; 1280 1281 ifp = sc->vtnet_ifp; 1282 drv_running = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0; 1283 1284 VTNET_CORE_LOCK_ASSERT(sc); 1285 1286 if ((ifp->if_flags & IFF_UP) == 0) { 1287 if (drv_running) 1288 vtnet_stop(sc); 1289 goto out; 1290 } 1291 1292 if (!drv_running) { 1293 vtnet_init_locked(sc, 0); 1294 goto out; 1295 } 1296 1297 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 1298 (IFF_PROMISC | IFF_ALLMULTI)) { 1299 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 1300 return (ENOTSUP); 1301 vtnet_rx_filter(sc); 1302 } 1303 1304 out: 1305 sc->vtnet_if_flags = ifp->if_flags; 1306 return (0); 1307 } 1308 1309 static int 1310 vtnet_ioctl_multi(struct vtnet_softc *sc) 1311 { 1312 struct ifnet *ifp; 1313 1314 ifp = sc->vtnet_ifp; 1315 1316 VTNET_CORE_LOCK_ASSERT(sc); 1317 1318 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1319 ifp->if_drv_flags & IFF_DRV_RUNNING) 1320 vtnet_rx_filter_mac(sc); 1321 1322 return (0); 1323 } 1324 1325 static int 1326 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1327 { 1328 struct ifnet *ifp; 1329 int mask, reinit, update; 1330 1331 ifp = sc->vtnet_ifp; 1332 mask = (ifr->ifr_reqcap & ifp->if_capabilities) ^ ifp->if_capenable; 1333 reinit = update = 0; 1334 1335 VTNET_CORE_LOCK_ASSERT(sc); 1336 1337 if (mask & IFCAP_TXCSUM) 1338 ifp->if_capenable ^= IFCAP_TXCSUM; 1339 if (mask & IFCAP_TXCSUM_IPV6) 1340 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1341 if (mask & IFCAP_TSO4) 1342 ifp->if_capenable ^= IFCAP_TSO4; 1343 if (mask & IFCAP_TSO6) 1344 ifp->if_capenable ^= IFCAP_TSO6; 1345 1346 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1347 /* 1348 * These Rx features require the negotiated features to 1349 * be updated. Avoid a full reinit if possible. 1350 */ 1351 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1352 update = 1; 1353 else 1354 reinit = 1; 1355 1356 /* BMV: Avoid needless renegotiation for just software LRO. */ 1357 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1358 IFCAP_LRO && vtnet_software_lro(sc)) 1359 reinit = update = 0; 1360 1361 if (mask & IFCAP_RXCSUM) 1362 ifp->if_capenable ^= IFCAP_RXCSUM; 1363 if (mask & IFCAP_RXCSUM_IPV6) 1364 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1365 if (mask & IFCAP_LRO) 1366 ifp->if_capenable ^= IFCAP_LRO; 1367 1368 /* 1369 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1370 * so treat them as a pair. Guest TSO (LRO) requires receive 1371 * checksums. 1372 */ 1373 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1374 ifp->if_capenable |= IFCAP_RXCSUM; 1375 #ifdef notyet 1376 ifp->if_capenable |= IFCAP_RXCSUM_IPV6; 1377 #endif 1378 } else 1379 ifp->if_capenable &= 1380 ~(IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO); 1381 } 1382 1383 if (mask & IFCAP_VLAN_HWFILTER) { 1384 /* These Rx features require renegotiation. */ 1385 reinit = 1; 1386 1387 if (mask & IFCAP_VLAN_HWFILTER) 1388 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1389 } 1390 1391 if (mask & IFCAP_VLAN_HWTSO) 1392 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1393 if (mask & IFCAP_VLAN_HWTAGGING) 1394 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1395 1396 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1397 if (reinit) { 1398 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1399 vtnet_init_locked(sc, 0); 1400 } else if (update) 1401 vtnet_update_rx_offloads(sc); 1402 } 1403 1404 return (0); 1405 } 1406 1407 static int 1408 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1409 { 1410 struct vtnet_softc *sc; 1411 struct ifreq *ifr; 1412 int error; 1413 1414 sc = ifp->if_softc; 1415 ifr = (struct ifreq *) data; 1416 error = 0; 1417 1418 switch (cmd) { 1419 case SIOCSIFMTU: 1420 VTNET_CORE_LOCK(sc); 1421 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1422 VTNET_CORE_UNLOCK(sc); 1423 break; 1424 1425 case SIOCSIFFLAGS: 1426 VTNET_CORE_LOCK(sc); 1427 error = vtnet_ioctl_ifflags(sc); 1428 VTNET_CORE_UNLOCK(sc); 1429 break; 1430 1431 case SIOCADDMULTI: 1432 case SIOCDELMULTI: 1433 VTNET_CORE_LOCK(sc); 1434 error = vtnet_ioctl_multi(sc); 1435 VTNET_CORE_UNLOCK(sc); 1436 break; 1437 1438 case SIOCSIFMEDIA: 1439 case SIOCGIFMEDIA: 1440 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1441 break; 1442 1443 case SIOCSIFCAP: 1444 VTNET_CORE_LOCK(sc); 1445 error = vtnet_ioctl_ifcap(sc, ifr); 1446 VTNET_CORE_UNLOCK(sc); 1447 VLAN_CAPABILITIES(ifp); 1448 break; 1449 1450 default: 1451 error = ether_ioctl(ifp, cmd, data); 1452 break; 1453 } 1454 1455 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1456 1457 return (error); 1458 } 1459 1460 static int 1461 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1462 { 1463 struct virtqueue *vq; 1464 int nbufs, error; 1465 1466 #ifdef DEV_NETMAP 1467 error = vtnet_netmap_rxq_populate(rxq); 1468 if (error >= 0) 1469 return (error); 1470 #endif /* DEV_NETMAP */ 1471 1472 vq = rxq->vtnrx_vq; 1473 error = ENOSPC; 1474 1475 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1476 error = vtnet_rxq_new_buf(rxq); 1477 if (error) 1478 break; 1479 } 1480 1481 if (nbufs > 0) { 1482 virtqueue_notify(vq); 1483 /* 1484 * EMSGSIZE signifies the virtqueue did not have enough 1485 * entries available to hold the last mbuf. This is not 1486 * an error. 1487 */ 1488 if (error == EMSGSIZE) 1489 error = 0; 1490 } 1491 1492 return (error); 1493 } 1494 1495 static void 1496 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1497 { 1498 struct virtqueue *vq; 1499 struct mbuf *m; 1500 int last; 1501 #ifdef DEV_NETMAP 1502 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1503 rxq->vtnrx_id, NR_RX); 1504 #else /* !DEV_NETMAP */ 1505 void *kring = NULL; 1506 #endif /* !DEV_NETMAP */ 1507 1508 vq = rxq->vtnrx_vq; 1509 last = 0; 1510 1511 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1512 if (kring == NULL) 1513 m_freem(m); 1514 } 1515 1516 KASSERT(virtqueue_empty(vq), 1517 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1518 } 1519 1520 static struct mbuf * 1521 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1522 { 1523 struct mbuf *m_head, *m_tail, *m; 1524 int i, size; 1525 1526 m_head = NULL; 1527 size = sc->vtnet_rx_clustersz; 1528 1529 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1530 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1531 1532 for (i = 0; i < nbufs; i++) { 1533 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1534 if (m == NULL) { 1535 sc->vtnet_stats.mbuf_alloc_failed++; 1536 m_freem(m_head); 1537 return (NULL); 1538 } 1539 1540 m->m_len = size; 1541 if (m_head != NULL) { 1542 m_tail->m_next = m; 1543 m_tail = m; 1544 } else 1545 m_head = m_tail = m; 1546 } 1547 1548 if (m_tailp != NULL) 1549 *m_tailp = m_tail; 1550 1551 return (m_head); 1552 } 1553 1554 /* 1555 * Slow path for when LRO without mergeable buffers is negotiated. 1556 */ 1557 static int 1558 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1559 int len0) 1560 { 1561 struct vtnet_softc *sc; 1562 struct mbuf *m, *m_prev, *m_new, *m_tail; 1563 int len, clustersz, nreplace, error; 1564 1565 sc = rxq->vtnrx_sc; 1566 clustersz = sc->vtnet_rx_clustersz; 1567 1568 m_prev = NULL; 1569 m_tail = NULL; 1570 nreplace = 0; 1571 1572 m = m0; 1573 len = len0; 1574 1575 /* 1576 * Since these mbuf chains are so large, avoid allocating a complete 1577 * replacement when the received frame did not consume the entire 1578 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1579 */ 1580 while (len > 0) { 1581 if (m == NULL) { 1582 sc->vtnet_stats.rx_frame_too_large++; 1583 return (EMSGSIZE); 1584 } 1585 1586 /* 1587 * Every mbuf should have the expected cluster size since that 1588 * is also used to allocate the replacements. 1589 */ 1590 KASSERT(m->m_len == clustersz, 1591 ("%s: mbuf size %d not expected cluster size %d", __func__, 1592 m->m_len, clustersz)); 1593 1594 m->m_len = MIN(m->m_len, len); 1595 len -= m->m_len; 1596 1597 m_prev = m; 1598 m = m->m_next; 1599 nreplace++; 1600 } 1601 1602 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1603 ("%s: invalid replacement mbuf count %d max %d", __func__, 1604 nreplace, sc->vtnet_rx_nmbufs)); 1605 1606 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1607 if (m_new == NULL) { 1608 m_prev->m_len = clustersz; 1609 return (ENOBUFS); 1610 } 1611 1612 /* 1613 * Move any unused mbufs from the received mbuf chain onto the 1614 * end of the replacement chain. 1615 */ 1616 if (m_prev->m_next != NULL) { 1617 m_tail->m_next = m_prev->m_next; 1618 m_prev->m_next = NULL; 1619 } 1620 1621 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1622 if (error) { 1623 /* 1624 * The replacement is suppose to be an copy of the one 1625 * dequeued so this is a very unexpected error. 1626 * 1627 * Restore the m0 chain to the original state if it was 1628 * modified so we can then discard it. 1629 */ 1630 if (m_tail->m_next != NULL) { 1631 m_prev->m_next = m_tail->m_next; 1632 m_tail->m_next = NULL; 1633 } 1634 m_prev->m_len = clustersz; 1635 sc->vtnet_stats.rx_enq_replacement_failed++; 1636 m_freem(m_new); 1637 } 1638 1639 return (error); 1640 } 1641 1642 static int 1643 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1644 { 1645 struct vtnet_softc *sc; 1646 struct mbuf *m_new; 1647 int error; 1648 1649 sc = rxq->vtnrx_sc; 1650 1651 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1652 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1653 1654 MPASS(m->m_next == NULL); 1655 if (m->m_len < len) 1656 return (EMSGSIZE); 1657 1658 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1659 if (m_new == NULL) 1660 return (ENOBUFS); 1661 1662 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1663 if (error) { 1664 sc->vtnet_stats.rx_enq_replacement_failed++; 1665 m_freem(m_new); 1666 } else 1667 m->m_len = len; 1668 1669 return (error); 1670 } 1671 1672 static int 1673 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1674 { 1675 struct vtnet_softc *sc; 1676 struct sglist *sg; 1677 int header_inlined, error; 1678 1679 sc = rxq->vtnrx_sc; 1680 sg = rxq->vtnrx_sg; 1681 1682 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1683 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1684 VTNET_RXQ_LOCK_ASSERT(rxq); 1685 1686 sglist_reset(sg); 1687 header_inlined = vtnet_modern(sc) || 1688 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1689 1690 if (header_inlined) 1691 error = sglist_append_mbuf(sg, m); 1692 else { 1693 struct vtnet_rx_header *rxhdr = 1694 mtod(m, struct vtnet_rx_header *); 1695 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1696 1697 /* Append the header and remaining mbuf data. */ 1698 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1699 if (error) 1700 return (error); 1701 error = sglist_append(sg, &rxhdr[1], 1702 m->m_len - sizeof(struct vtnet_rx_header)); 1703 if (error) 1704 return (error); 1705 1706 if (m->m_next != NULL) 1707 error = sglist_append_mbuf(sg, m->m_next); 1708 } 1709 1710 if (error) 1711 return (error); 1712 1713 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1714 } 1715 1716 static int 1717 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1718 { 1719 struct vtnet_softc *sc; 1720 struct mbuf *m; 1721 int error; 1722 1723 sc = rxq->vtnrx_sc; 1724 1725 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1726 if (m == NULL) 1727 return (ENOBUFS); 1728 1729 error = vtnet_rxq_enqueue_buf(rxq, m); 1730 if (error) 1731 m_freem(m); 1732 1733 return (error); 1734 } 1735 1736 static int 1737 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1738 int hoff, struct virtio_net_hdr *hdr) 1739 { 1740 struct vtnet_softc *sc; 1741 int error; 1742 1743 sc = rxq->vtnrx_sc; 1744 1745 /* 1746 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1747 * not have an analogous CSUM flag. The checksum has been validated, 1748 * but is incomplete (TCP/UDP pseudo header). 1749 * 1750 * The packet is likely from another VM on the same host that itself 1751 * performed checksum offloading so Tx/Rx is basically a memcpy and 1752 * the checksum has little value. 1753 * 1754 * Default to receiving the packet as-is for performance reasons, but 1755 * this can cause issues if the packet is to be forwarded because it 1756 * does not contain a valid checksum. This patch may be helpful: 1757 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1758 * compute the checksum if requested. 1759 * 1760 * BMV: Need to add an CSUM_PARTIAL flag? 1761 */ 1762 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1763 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1764 return (error); 1765 } 1766 1767 /* 1768 * Compute the checksum in the driver so the packet will contain a 1769 * valid checksum. The checksum is at csum_offset from csum_start. 1770 */ 1771 switch (etype) { 1772 #if defined(INET) || defined(INET6) 1773 case ETHERTYPE_IP: 1774 case ETHERTYPE_IPV6: { 1775 int csum_off, csum_end; 1776 uint16_t csum; 1777 1778 csum_off = hdr->csum_start + hdr->csum_offset; 1779 csum_end = csum_off + sizeof(uint16_t); 1780 1781 /* Assume checksum will be in the first mbuf. */ 1782 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1783 return (1); 1784 1785 /* 1786 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1787 * checksum and write it at the specified offset. We could 1788 * try to verify the packet: csum_start should probably 1789 * correspond to the start of the TCP/UDP header. 1790 * 1791 * BMV: Need to properly handle UDP with zero checksum. Is 1792 * the IPv4 header checksum implicitly validated? 1793 */ 1794 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1795 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1796 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1797 m->m_pkthdr.csum_data = 0xFFFF; 1798 break; 1799 } 1800 #endif 1801 default: 1802 sc->vtnet_stats.rx_csum_bad_ethtype++; 1803 return (1); 1804 } 1805 1806 return (0); 1807 } 1808 1809 static int 1810 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1811 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1812 { 1813 struct vtnet_softc *sc; 1814 int protocol; 1815 1816 sc = rxq->vtnrx_sc; 1817 1818 switch (etype) { 1819 #if defined(INET) 1820 case ETHERTYPE_IP: 1821 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1822 protocol = IPPROTO_DONE; 1823 else { 1824 struct ip *ip = (struct ip *)(m->m_data + hoff); 1825 protocol = ip->ip_p; 1826 } 1827 break; 1828 #endif 1829 #if defined(INET6) 1830 case ETHERTYPE_IPV6: 1831 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1832 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1833 protocol = IPPROTO_DONE; 1834 break; 1835 #endif 1836 default: 1837 protocol = IPPROTO_DONE; 1838 break; 1839 } 1840 1841 switch (protocol) { 1842 case IPPROTO_TCP: 1843 case IPPROTO_UDP: 1844 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1845 m->m_pkthdr.csum_data = 0xFFFF; 1846 break; 1847 default: 1848 /* 1849 * FreeBSD does not support checksum offloading of this 1850 * protocol. Let the stack re-verify the checksum later 1851 * if the protocol is supported. 1852 */ 1853 #if 0 1854 if_printf(sc->vtnet_ifp, 1855 "%s: checksum offload of unsupported protocol " 1856 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1857 __func__, etype, protocol, hdr->csum_start, 1858 hdr->csum_offset); 1859 #endif 1860 break; 1861 } 1862 1863 return (0); 1864 } 1865 1866 static int 1867 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1868 struct virtio_net_hdr *hdr) 1869 { 1870 const struct ether_header *eh; 1871 int hoff; 1872 uint16_t etype; 1873 1874 eh = mtod(m, const struct ether_header *); 1875 etype = ntohs(eh->ether_type); 1876 if (etype == ETHERTYPE_VLAN) { 1877 /* TODO BMV: Handle QinQ. */ 1878 const struct ether_vlan_header *evh = 1879 mtod(m, const struct ether_vlan_header *); 1880 etype = ntohs(evh->evl_proto); 1881 hoff = sizeof(struct ether_vlan_header); 1882 } else 1883 hoff = sizeof(struct ether_header); 1884 1885 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1886 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1887 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1888 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1889 } 1890 1891 static void 1892 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1893 { 1894 struct mbuf *m; 1895 1896 while (--nbufs > 0) { 1897 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1898 if (m == NULL) 1899 break; 1900 vtnet_rxq_discard_buf(rxq, m); 1901 } 1902 } 1903 1904 static void 1905 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1906 { 1907 int error; 1908 1909 /* 1910 * Requeue the discarded mbuf. This should always be successful 1911 * since it was just dequeued. 1912 */ 1913 error = vtnet_rxq_enqueue_buf(rxq, m); 1914 KASSERT(error == 0, 1915 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1916 } 1917 1918 static int 1919 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1920 { 1921 struct vtnet_softc *sc; 1922 struct virtqueue *vq; 1923 struct mbuf *m_tail; 1924 1925 sc = rxq->vtnrx_sc; 1926 vq = rxq->vtnrx_vq; 1927 m_tail = m_head; 1928 1929 while (--nbufs > 0) { 1930 struct mbuf *m; 1931 uint32_t len; 1932 1933 m = virtqueue_dequeue(vq, &len); 1934 if (m == NULL) { 1935 rxq->vtnrx_stats.vrxs_ierrors++; 1936 goto fail; 1937 } 1938 1939 if (vtnet_rxq_new_buf(rxq) != 0) { 1940 rxq->vtnrx_stats.vrxs_iqdrops++; 1941 vtnet_rxq_discard_buf(rxq, m); 1942 if (nbufs > 1) 1943 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1944 goto fail; 1945 } 1946 1947 if (m->m_len < len) 1948 len = m->m_len; 1949 1950 m->m_len = len; 1951 m->m_flags &= ~M_PKTHDR; 1952 1953 m_head->m_pkthdr.len += len; 1954 m_tail->m_next = m; 1955 m_tail = m; 1956 } 1957 1958 return (0); 1959 1960 fail: 1961 sc->vtnet_stats.rx_mergeable_failed++; 1962 m_freem(m_head); 1963 1964 return (1); 1965 } 1966 1967 #if defined(INET) || defined(INET6) 1968 static int 1969 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1970 { 1971 struct lro_ctrl *lro; 1972 1973 lro = &rxq->vtnrx_lro; 1974 1975 if (lro->lro_mbuf_max != 0) { 1976 tcp_lro_queue_mbuf(lro, m); 1977 return (0); 1978 } 1979 1980 return (tcp_lro_rx(lro, m, 0)); 1981 } 1982 #endif 1983 1984 static void 1985 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1986 struct virtio_net_hdr *hdr) 1987 { 1988 struct vtnet_softc *sc; 1989 struct ifnet *ifp; 1990 1991 sc = rxq->vtnrx_sc; 1992 ifp = sc->vtnet_ifp; 1993 1994 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1995 struct ether_header *eh = mtod(m, struct ether_header *); 1996 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1997 vtnet_vlan_tag_remove(m); 1998 /* 1999 * With the 802.1Q header removed, update the 2000 * checksum starting location accordingly. 2001 */ 2002 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2003 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2004 } 2005 } 2006 2007 m->m_pkthdr.flowid = rxq->vtnrx_id; 2008 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2009 2010 if (hdr->flags & 2011 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2012 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2013 rxq->vtnrx_stats.vrxs_csum++; 2014 else 2015 rxq->vtnrx_stats.vrxs_csum_failed++; 2016 } 2017 2018 if (hdr->gso_size != 0) { 2019 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2020 case VIRTIO_NET_HDR_GSO_TCPV4: 2021 case VIRTIO_NET_HDR_GSO_TCPV6: 2022 m->m_pkthdr.lro_nsegs = 2023 howmany(m->m_pkthdr.len, hdr->gso_size); 2024 rxq->vtnrx_stats.vrxs_host_lro++; 2025 break; 2026 } 2027 } 2028 2029 rxq->vtnrx_stats.vrxs_ipackets++; 2030 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2031 2032 #if defined(INET) || defined(INET6) 2033 if (vtnet_software_lro(sc) && ifp->if_capenable & IFCAP_LRO) { 2034 if (vtnet_lro_rx(rxq, m) == 0) 2035 return; 2036 } 2037 #endif 2038 2039 (*ifp->if_input)(ifp, m); 2040 } 2041 2042 static int 2043 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2044 { 2045 struct virtio_net_hdr lhdr, *hdr; 2046 struct vtnet_softc *sc; 2047 struct ifnet *ifp; 2048 struct virtqueue *vq; 2049 int deq, count; 2050 2051 sc = rxq->vtnrx_sc; 2052 vq = rxq->vtnrx_vq; 2053 ifp = sc->vtnet_ifp; 2054 deq = 0; 2055 count = sc->vtnet_rx_process_limit; 2056 2057 VTNET_RXQ_LOCK_ASSERT(rxq); 2058 2059 while (count-- > 0) { 2060 struct mbuf *m; 2061 uint32_t len, nbufs, adjsz; 2062 2063 m = virtqueue_dequeue(vq, &len); 2064 if (m == NULL) 2065 break; 2066 deq++; 2067 2068 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2069 rxq->vtnrx_stats.vrxs_ierrors++; 2070 vtnet_rxq_discard_buf(rxq, m); 2071 continue; 2072 } 2073 2074 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2075 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2076 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2077 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2078 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2079 } else if (vtnet_modern(sc)) { 2080 nbufs = 1; /* num_buffers is always 1 */ 2081 adjsz = sizeof(struct virtio_net_hdr_v1); 2082 } else { 2083 nbufs = 1; 2084 adjsz = sizeof(struct vtnet_rx_header); 2085 /* 2086 * Account for our gap between the header and start of 2087 * data to keep the segments separated. 2088 */ 2089 len += VTNET_RX_HEADER_PAD; 2090 } 2091 2092 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2093 rxq->vtnrx_stats.vrxs_iqdrops++; 2094 vtnet_rxq_discard_buf(rxq, m); 2095 if (nbufs > 1) 2096 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2097 continue; 2098 } 2099 2100 m->m_pkthdr.len = len; 2101 m->m_pkthdr.rcvif = ifp; 2102 m->m_pkthdr.csum_flags = 0; 2103 2104 if (nbufs > 1) { 2105 /* Dequeue the rest of chain. */ 2106 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2107 continue; 2108 } 2109 2110 /* 2111 * Save an endian swapped version of the header prior to it 2112 * being stripped. The header is always at the start of the 2113 * mbuf data. num_buffers was already saved (and not needed) 2114 * so use the standard header. 2115 */ 2116 hdr = mtod(m, struct virtio_net_hdr *); 2117 lhdr.flags = hdr->flags; 2118 lhdr.gso_type = hdr->gso_type; 2119 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2120 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2121 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2122 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2123 m_adj(m, adjsz); 2124 2125 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2126 pfil_return_t pfil; 2127 2128 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 2129 NULL); 2130 switch (pfil) { 2131 case PFIL_REALLOCED: 2132 m = pfil_mem2mbuf(m->m_data); 2133 break; 2134 case PFIL_DROPPED: 2135 case PFIL_CONSUMED: 2136 continue; 2137 default: 2138 KASSERT(pfil == PFIL_PASS, 2139 ("Filter returned %d!", pfil)); 2140 } 2141 } 2142 2143 vtnet_rxq_input(rxq, m, &lhdr); 2144 } 2145 2146 if (deq > 0) { 2147 #if defined(INET) || defined(INET6) 2148 if (vtnet_software_lro(sc)) 2149 tcp_lro_flush_all(&rxq->vtnrx_lro); 2150 #endif 2151 virtqueue_notify(vq); 2152 } 2153 2154 return (count > 0 ? 0 : EAGAIN); 2155 } 2156 2157 static void 2158 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2159 { 2160 struct vtnet_softc *sc; 2161 struct ifnet *ifp; 2162 u_int more; 2163 #ifdef DEV_NETMAP 2164 int nmirq; 2165 #endif /* DEV_NETMAP */ 2166 2167 sc = rxq->vtnrx_sc; 2168 ifp = sc->vtnet_ifp; 2169 2170 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2171 /* 2172 * Ignore this interrupt. Either this is a spurious interrupt 2173 * or multiqueue without per-VQ MSIX so every queue needs to 2174 * be polled (a brain dead configuration we could try harder 2175 * to avoid). 2176 */ 2177 vtnet_rxq_disable_intr(rxq); 2178 return; 2179 } 2180 2181 VTNET_RXQ_LOCK(rxq); 2182 2183 #ifdef DEV_NETMAP 2184 /* 2185 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2186 * This is not necessary to serialize the access to the RX vq, but 2187 * rather to avoid races that may happen if this interface is 2188 * attached to a VALE switch, which would cause received packets 2189 * to stall in the RX queue (nm_kr_tryget() could find the kring 2190 * busy when called from netmap_bwrap_intr_notify()). 2191 */ 2192 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2193 if (nmirq != NM_IRQ_PASS) { 2194 VTNET_RXQ_UNLOCK(rxq); 2195 if (nmirq == NM_IRQ_RESCHED) { 2196 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2197 } 2198 return; 2199 } 2200 #endif /* DEV_NETMAP */ 2201 2202 again: 2203 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2204 VTNET_RXQ_UNLOCK(rxq); 2205 return; 2206 } 2207 2208 more = vtnet_rxq_eof(rxq); 2209 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2210 if (!more) 2211 vtnet_rxq_disable_intr(rxq); 2212 /* 2213 * This is an occasional condition or race (when !more), 2214 * so retry a few times before scheduling the taskqueue. 2215 */ 2216 if (tries-- > 0) 2217 goto again; 2218 2219 rxq->vtnrx_stats.vrxs_rescheduled++; 2220 VTNET_RXQ_UNLOCK(rxq); 2221 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2222 } else 2223 VTNET_RXQ_UNLOCK(rxq); 2224 } 2225 2226 static void 2227 vtnet_rx_vq_intr(void *xrxq) 2228 { 2229 struct vtnet_rxq *rxq; 2230 2231 rxq = xrxq; 2232 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2233 } 2234 2235 static void 2236 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2237 { 2238 struct vtnet_rxq *rxq; 2239 2240 rxq = xrxq; 2241 vtnet_rx_vq_process(rxq, 0); 2242 } 2243 2244 static int 2245 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2246 { 2247 struct vtnet_softc *sc; 2248 int threshold; 2249 2250 sc = txq->vtntx_sc; 2251 2252 /* 2253 * The Tx interrupt is disabled until the queue free count falls 2254 * below our threshold. Completed frames are drained from the Tx 2255 * virtqueue before transmitting new frames and in the watchdog 2256 * callout, so the frequency of Tx interrupts is greatly reduced, 2257 * at the cost of not freeing mbufs as quickly as they otherwise 2258 * would be. 2259 */ 2260 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2261 2262 /* 2263 * Without indirect descriptors, leave enough room for the most 2264 * segments we handle. 2265 */ 2266 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2267 threshold < sc->vtnet_tx_nsegs) 2268 threshold = sc->vtnet_tx_nsegs; 2269 2270 return (threshold); 2271 } 2272 2273 static int 2274 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2275 { 2276 struct virtqueue *vq; 2277 2278 vq = txq->vtntx_vq; 2279 2280 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2281 } 2282 2283 static int 2284 vtnet_txq_notify(struct vtnet_txq *txq) 2285 { 2286 struct virtqueue *vq; 2287 2288 vq = txq->vtntx_vq; 2289 2290 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2291 virtqueue_notify(vq); 2292 2293 if (vtnet_txq_enable_intr(txq) == 0) 2294 return (0); 2295 2296 /* 2297 * Drain frames that were completed since last checked. If this 2298 * causes the queue to go above the threshold, the caller should 2299 * continue transmitting. 2300 */ 2301 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2302 virtqueue_disable_intr(vq); 2303 return (1); 2304 } 2305 2306 return (0); 2307 } 2308 2309 static void 2310 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2311 { 2312 struct virtqueue *vq; 2313 struct vtnet_tx_header *txhdr; 2314 int last; 2315 #ifdef DEV_NETMAP 2316 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2317 txq->vtntx_id, NR_TX); 2318 #else /* !DEV_NETMAP */ 2319 void *kring = NULL; 2320 #endif /* !DEV_NETMAP */ 2321 2322 vq = txq->vtntx_vq; 2323 last = 0; 2324 2325 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2326 if (kring == NULL) { 2327 m_freem(txhdr->vth_mbuf); 2328 uma_zfree(vtnet_tx_header_zone, txhdr); 2329 } 2330 } 2331 2332 KASSERT(virtqueue_empty(vq), 2333 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2334 } 2335 2336 /* 2337 * BMV: This can go away once we finally have offsets in the mbuf header. 2338 */ 2339 static int 2340 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2341 int *proto, int *start) 2342 { 2343 struct vtnet_softc *sc; 2344 struct ether_vlan_header *evh; 2345 int offset; 2346 2347 sc = txq->vtntx_sc; 2348 2349 evh = mtod(m, struct ether_vlan_header *); 2350 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2351 /* BMV: We should handle nested VLAN tags too. */ 2352 *etype = ntohs(evh->evl_proto); 2353 offset = sizeof(struct ether_vlan_header); 2354 } else { 2355 *etype = ntohs(evh->evl_encap_proto); 2356 offset = sizeof(struct ether_header); 2357 } 2358 2359 switch (*etype) { 2360 #if defined(INET) 2361 case ETHERTYPE_IP: { 2362 struct ip *ip, iphdr; 2363 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2364 m_copydata(m, offset, sizeof(struct ip), 2365 (caddr_t) &iphdr); 2366 ip = &iphdr; 2367 } else 2368 ip = (struct ip *)(m->m_data + offset); 2369 *proto = ip->ip_p; 2370 *start = offset + (ip->ip_hl << 2); 2371 break; 2372 } 2373 #endif 2374 #if defined(INET6) 2375 case ETHERTYPE_IPV6: 2376 *proto = -1; 2377 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2378 /* Assert the network stack sent us a valid packet. */ 2379 KASSERT(*start > offset, 2380 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2381 *start, offset, *proto)); 2382 break; 2383 #endif 2384 default: 2385 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2386 return (EINVAL); 2387 } 2388 2389 return (0); 2390 } 2391 2392 static int 2393 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2394 int offset, struct virtio_net_hdr *hdr) 2395 { 2396 static struct timeval lastecn; 2397 static int curecn; 2398 struct vtnet_softc *sc; 2399 struct tcphdr *tcp, tcphdr; 2400 2401 sc = txq->vtntx_sc; 2402 2403 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2404 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2405 tcp = &tcphdr; 2406 } else 2407 tcp = (struct tcphdr *)(m->m_data + offset); 2408 2409 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2410 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2411 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2412 VIRTIO_NET_HDR_GSO_TCPV6; 2413 2414 if (__predict_false(tcp->th_flags & TH_CWR)) { 2415 /* 2416 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2417 * FreeBSD, ECN support is not on a per-interface basis, 2418 * but globally via the net.inet.tcp.ecn.enable sysctl 2419 * knob. The default is off. 2420 */ 2421 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2422 if (ppsratecheck(&lastecn, &curecn, 1)) 2423 if_printf(sc->vtnet_ifp, 2424 "TSO with ECN not negotiated with host\n"); 2425 return (ENOTSUP); 2426 } 2427 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2428 } 2429 2430 txq->vtntx_stats.vtxs_tso++; 2431 2432 return (0); 2433 } 2434 2435 static struct mbuf * 2436 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2437 struct virtio_net_hdr *hdr) 2438 { 2439 struct vtnet_softc *sc; 2440 int flags, etype, csum_start, proto, error; 2441 2442 sc = txq->vtntx_sc; 2443 flags = m->m_pkthdr.csum_flags; 2444 2445 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2446 if (error) 2447 goto drop; 2448 2449 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2450 /* Sanity check the parsed mbuf matches the offload flags. */ 2451 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2452 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2453 && etype != ETHERTYPE_IPV6))) { 2454 sc->vtnet_stats.tx_csum_proto_mismatch++; 2455 goto drop; 2456 } 2457 2458 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2459 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2460 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2461 txq->vtntx_stats.vtxs_csum++; 2462 } 2463 2464 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2465 /* 2466 * Sanity check the parsed mbuf IP protocol is TCP, and 2467 * VirtIO TSO reqires the checksum offloading above. 2468 */ 2469 if (__predict_false(proto != IPPROTO_TCP)) { 2470 sc->vtnet_stats.tx_tso_not_tcp++; 2471 goto drop; 2472 } else if (__predict_false((hdr->flags & 2473 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2474 sc->vtnet_stats.tx_tso_without_csum++; 2475 goto drop; 2476 } 2477 2478 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2479 if (error) 2480 goto drop; 2481 } 2482 2483 return (m); 2484 2485 drop: 2486 m_freem(m); 2487 return (NULL); 2488 } 2489 2490 static int 2491 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2492 struct vtnet_tx_header *txhdr) 2493 { 2494 struct vtnet_softc *sc; 2495 struct virtqueue *vq; 2496 struct sglist *sg; 2497 struct mbuf *m; 2498 int error; 2499 2500 sc = txq->vtntx_sc; 2501 vq = txq->vtntx_vq; 2502 sg = txq->vtntx_sg; 2503 m = *m_head; 2504 2505 sglist_reset(sg); 2506 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2507 if (error != 0 || sg->sg_nseg != 1) { 2508 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2509 __func__, error, sg->sg_nseg)); 2510 goto fail; 2511 } 2512 2513 error = sglist_append_mbuf(sg, m); 2514 if (error) { 2515 m = m_defrag(m, M_NOWAIT); 2516 if (m == NULL) 2517 goto fail; 2518 2519 *m_head = m; 2520 sc->vtnet_stats.tx_defragged++; 2521 2522 error = sglist_append_mbuf(sg, m); 2523 if (error) 2524 goto fail; 2525 } 2526 2527 txhdr->vth_mbuf = m; 2528 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2529 2530 return (error); 2531 2532 fail: 2533 sc->vtnet_stats.tx_defrag_failed++; 2534 m_freem(*m_head); 2535 *m_head = NULL; 2536 2537 return (ENOBUFS); 2538 } 2539 2540 static int 2541 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2542 { 2543 struct vtnet_tx_header *txhdr; 2544 struct virtio_net_hdr *hdr; 2545 struct mbuf *m; 2546 int error; 2547 2548 m = *m_head; 2549 M_ASSERTPKTHDR(m); 2550 2551 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2552 if (txhdr == NULL) { 2553 m_freem(m); 2554 *m_head = NULL; 2555 return (ENOMEM); 2556 } 2557 2558 /* 2559 * Always use the non-mergeable header, regardless if mergable headers 2560 * were negotiated, because for transmit num_buffers is always zero. 2561 * The vtnet_hdr_size is used to enqueue the right header size segment. 2562 */ 2563 hdr = &txhdr->vth_uhdr.hdr; 2564 2565 if (m->m_flags & M_VLANTAG) { 2566 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2567 if ((*m_head = m) == NULL) { 2568 error = ENOBUFS; 2569 goto fail; 2570 } 2571 m->m_flags &= ~M_VLANTAG; 2572 } 2573 2574 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2575 m = vtnet_txq_offload(txq, m, hdr); 2576 if ((*m_head = m) == NULL) { 2577 error = ENOBUFS; 2578 goto fail; 2579 } 2580 } 2581 2582 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2583 fail: 2584 if (error) 2585 uma_zfree(vtnet_tx_header_zone, txhdr); 2586 2587 return (error); 2588 } 2589 2590 #ifdef VTNET_LEGACY_TX 2591 2592 static void 2593 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2594 { 2595 struct vtnet_softc *sc; 2596 struct virtqueue *vq; 2597 struct mbuf *m0; 2598 int tries, enq; 2599 2600 sc = txq->vtntx_sc; 2601 vq = txq->vtntx_vq; 2602 tries = 0; 2603 2604 VTNET_TXQ_LOCK_ASSERT(txq); 2605 2606 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2607 sc->vtnet_link_active == 0) 2608 return; 2609 2610 vtnet_txq_eof(txq); 2611 2612 again: 2613 enq = 0; 2614 2615 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2616 if (virtqueue_full(vq)) 2617 break; 2618 2619 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2620 if (m0 == NULL) 2621 break; 2622 2623 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2624 if (m0 != NULL) 2625 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2626 break; 2627 } 2628 2629 enq++; 2630 ETHER_BPF_MTAP(ifp, m0); 2631 } 2632 2633 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2634 if (tries++ < VTNET_NOTIFY_RETRIES) 2635 goto again; 2636 2637 txq->vtntx_stats.vtxs_rescheduled++; 2638 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2639 } 2640 } 2641 2642 static void 2643 vtnet_start(struct ifnet *ifp) 2644 { 2645 struct vtnet_softc *sc; 2646 struct vtnet_txq *txq; 2647 2648 sc = ifp->if_softc; 2649 txq = &sc->vtnet_txqs[0]; 2650 2651 VTNET_TXQ_LOCK(txq); 2652 vtnet_start_locked(txq, ifp); 2653 VTNET_TXQ_UNLOCK(txq); 2654 } 2655 2656 #else /* !VTNET_LEGACY_TX */ 2657 2658 static int 2659 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2660 { 2661 struct vtnet_softc *sc; 2662 struct virtqueue *vq; 2663 struct buf_ring *br; 2664 struct ifnet *ifp; 2665 int enq, tries, error; 2666 2667 sc = txq->vtntx_sc; 2668 vq = txq->vtntx_vq; 2669 br = txq->vtntx_br; 2670 ifp = sc->vtnet_ifp; 2671 tries = 0; 2672 error = 0; 2673 2674 VTNET_TXQ_LOCK_ASSERT(txq); 2675 2676 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2677 sc->vtnet_link_active == 0) { 2678 if (m != NULL) 2679 error = drbr_enqueue(ifp, br, m); 2680 return (error); 2681 } 2682 2683 if (m != NULL) { 2684 error = drbr_enqueue(ifp, br, m); 2685 if (error) 2686 return (error); 2687 } 2688 2689 vtnet_txq_eof(txq); 2690 2691 again: 2692 enq = 0; 2693 2694 while ((m = drbr_peek(ifp, br)) != NULL) { 2695 if (virtqueue_full(vq)) { 2696 drbr_putback(ifp, br, m); 2697 break; 2698 } 2699 2700 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2701 if (m != NULL) 2702 drbr_putback(ifp, br, m); 2703 else 2704 drbr_advance(ifp, br); 2705 break; 2706 } 2707 drbr_advance(ifp, br); 2708 2709 enq++; 2710 ETHER_BPF_MTAP(ifp, m); 2711 } 2712 2713 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2714 if (tries++ < VTNET_NOTIFY_RETRIES) 2715 goto again; 2716 2717 txq->vtntx_stats.vtxs_rescheduled++; 2718 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2719 } 2720 2721 return (0); 2722 } 2723 2724 static int 2725 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2726 { 2727 struct vtnet_softc *sc; 2728 struct vtnet_txq *txq; 2729 int i, npairs, error; 2730 2731 sc = ifp->if_softc; 2732 npairs = sc->vtnet_act_vq_pairs; 2733 2734 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2735 i = m->m_pkthdr.flowid % npairs; 2736 else 2737 i = curcpu % npairs; 2738 2739 txq = &sc->vtnet_txqs[i]; 2740 2741 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2742 error = vtnet_txq_mq_start_locked(txq, m); 2743 VTNET_TXQ_UNLOCK(txq); 2744 } else { 2745 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2746 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2747 } 2748 2749 return (error); 2750 } 2751 2752 static void 2753 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2754 { 2755 struct vtnet_softc *sc; 2756 struct vtnet_txq *txq; 2757 2758 txq = xtxq; 2759 sc = txq->vtntx_sc; 2760 2761 VTNET_TXQ_LOCK(txq); 2762 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2763 vtnet_txq_mq_start_locked(txq, NULL); 2764 VTNET_TXQ_UNLOCK(txq); 2765 } 2766 2767 #endif /* VTNET_LEGACY_TX */ 2768 2769 static void 2770 vtnet_txq_start(struct vtnet_txq *txq) 2771 { 2772 struct vtnet_softc *sc; 2773 struct ifnet *ifp; 2774 2775 sc = txq->vtntx_sc; 2776 ifp = sc->vtnet_ifp; 2777 2778 #ifdef VTNET_LEGACY_TX 2779 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2780 vtnet_start_locked(txq, ifp); 2781 #else 2782 if (!drbr_empty(ifp, txq->vtntx_br)) 2783 vtnet_txq_mq_start_locked(txq, NULL); 2784 #endif 2785 } 2786 2787 static void 2788 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2789 { 2790 struct vtnet_softc *sc; 2791 struct vtnet_txq *txq; 2792 struct ifnet *ifp; 2793 2794 txq = xtxq; 2795 sc = txq->vtntx_sc; 2796 ifp = sc->vtnet_ifp; 2797 2798 VTNET_TXQ_LOCK(txq); 2799 2800 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2801 VTNET_TXQ_UNLOCK(txq); 2802 return; 2803 } 2804 2805 vtnet_txq_eof(txq); 2806 vtnet_txq_start(txq); 2807 2808 VTNET_TXQ_UNLOCK(txq); 2809 } 2810 2811 static int 2812 vtnet_txq_eof(struct vtnet_txq *txq) 2813 { 2814 struct virtqueue *vq; 2815 struct vtnet_tx_header *txhdr; 2816 struct mbuf *m; 2817 int deq; 2818 2819 vq = txq->vtntx_vq; 2820 deq = 0; 2821 VTNET_TXQ_LOCK_ASSERT(txq); 2822 2823 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2824 m = txhdr->vth_mbuf; 2825 deq++; 2826 2827 txq->vtntx_stats.vtxs_opackets++; 2828 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2829 if (m->m_flags & M_MCAST) 2830 txq->vtntx_stats.vtxs_omcasts++; 2831 2832 m_freem(m); 2833 uma_zfree(vtnet_tx_header_zone, txhdr); 2834 } 2835 2836 if (virtqueue_empty(vq)) 2837 txq->vtntx_watchdog = 0; 2838 2839 return (deq); 2840 } 2841 2842 static void 2843 vtnet_tx_vq_intr(void *xtxq) 2844 { 2845 struct vtnet_softc *sc; 2846 struct vtnet_txq *txq; 2847 struct ifnet *ifp; 2848 2849 txq = xtxq; 2850 sc = txq->vtntx_sc; 2851 ifp = sc->vtnet_ifp; 2852 2853 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2854 /* 2855 * Ignore this interrupt. Either this is a spurious interrupt 2856 * or multiqueue without per-VQ MSIX so every queue needs to 2857 * be polled (a brain dead configuration we could try harder 2858 * to avoid). 2859 */ 2860 vtnet_txq_disable_intr(txq); 2861 return; 2862 } 2863 2864 #ifdef DEV_NETMAP 2865 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2866 return; 2867 #endif /* DEV_NETMAP */ 2868 2869 VTNET_TXQ_LOCK(txq); 2870 2871 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2872 VTNET_TXQ_UNLOCK(txq); 2873 return; 2874 } 2875 2876 vtnet_txq_eof(txq); 2877 vtnet_txq_start(txq); 2878 2879 VTNET_TXQ_UNLOCK(txq); 2880 } 2881 2882 static void 2883 vtnet_tx_start_all(struct vtnet_softc *sc) 2884 { 2885 struct vtnet_txq *txq; 2886 int i; 2887 2888 VTNET_CORE_LOCK_ASSERT(sc); 2889 2890 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2891 txq = &sc->vtnet_txqs[i]; 2892 2893 VTNET_TXQ_LOCK(txq); 2894 vtnet_txq_start(txq); 2895 VTNET_TXQ_UNLOCK(txq); 2896 } 2897 } 2898 2899 #ifndef VTNET_LEGACY_TX 2900 static void 2901 vtnet_qflush(struct ifnet *ifp) 2902 { 2903 struct vtnet_softc *sc; 2904 struct vtnet_txq *txq; 2905 struct mbuf *m; 2906 int i; 2907 2908 sc = ifp->if_softc; 2909 2910 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2911 txq = &sc->vtnet_txqs[i]; 2912 2913 VTNET_TXQ_LOCK(txq); 2914 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2915 m_freem(m); 2916 VTNET_TXQ_UNLOCK(txq); 2917 } 2918 2919 if_qflush(ifp); 2920 } 2921 #endif 2922 2923 static int 2924 vtnet_watchdog(struct vtnet_txq *txq) 2925 { 2926 struct ifnet *ifp; 2927 2928 ifp = txq->vtntx_sc->vtnet_ifp; 2929 2930 VTNET_TXQ_LOCK(txq); 2931 if (txq->vtntx_watchdog == 1) { 2932 /* 2933 * Only drain completed frames if the watchdog is about to 2934 * expire. If any frames were drained, there may be enough 2935 * free descriptors now available to transmit queued frames. 2936 * In that case, the timer will immediately be decremented 2937 * below, but the timeout is generous enough that should not 2938 * be a problem. 2939 */ 2940 if (vtnet_txq_eof(txq) != 0) 2941 vtnet_txq_start(txq); 2942 } 2943 2944 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2945 VTNET_TXQ_UNLOCK(txq); 2946 return (0); 2947 } 2948 VTNET_TXQ_UNLOCK(txq); 2949 2950 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2951 return (1); 2952 } 2953 2954 static void 2955 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2956 struct vtnet_txq_stats *txacc) 2957 { 2958 2959 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2960 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2961 2962 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2963 struct vtnet_rxq_stats *rxst; 2964 struct vtnet_txq_stats *txst; 2965 2966 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2967 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2968 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2969 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2970 rxacc->vrxs_csum += rxst->vrxs_csum; 2971 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2972 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2973 2974 txst = &sc->vtnet_txqs[i].vtntx_stats; 2975 txacc->vtxs_opackets += txst->vtxs_opackets; 2976 txacc->vtxs_obytes += txst->vtxs_obytes; 2977 txacc->vtxs_csum += txst->vtxs_csum; 2978 txacc->vtxs_tso += txst->vtxs_tso; 2979 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2980 } 2981 } 2982 2983 static uint64_t 2984 vtnet_get_counter(if_t ifp, ift_counter cnt) 2985 { 2986 struct vtnet_softc *sc; 2987 struct vtnet_rxq_stats rxaccum; 2988 struct vtnet_txq_stats txaccum; 2989 2990 sc = if_getsoftc(ifp); 2991 vtnet_accum_stats(sc, &rxaccum, &txaccum); 2992 2993 switch (cnt) { 2994 case IFCOUNTER_IPACKETS: 2995 return (rxaccum.vrxs_ipackets); 2996 case IFCOUNTER_IQDROPS: 2997 return (rxaccum.vrxs_iqdrops); 2998 case IFCOUNTER_IERRORS: 2999 return (rxaccum.vrxs_ierrors); 3000 case IFCOUNTER_OPACKETS: 3001 return (txaccum.vtxs_opackets); 3002 #ifndef VTNET_LEGACY_TX 3003 case IFCOUNTER_OBYTES: 3004 return (txaccum.vtxs_obytes); 3005 case IFCOUNTER_OMCASTS: 3006 return (txaccum.vtxs_omcasts); 3007 #endif 3008 default: 3009 return (if_get_counter_default(ifp, cnt)); 3010 } 3011 } 3012 3013 static void 3014 vtnet_tick(void *xsc) 3015 { 3016 struct vtnet_softc *sc; 3017 struct ifnet *ifp; 3018 int i, timedout; 3019 3020 sc = xsc; 3021 ifp = sc->vtnet_ifp; 3022 timedout = 0; 3023 3024 VTNET_CORE_LOCK_ASSERT(sc); 3025 3026 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3027 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3028 3029 if (timedout != 0) { 3030 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3031 vtnet_init_locked(sc, 0); 3032 } else 3033 callout_schedule(&sc->vtnet_tick_ch, hz); 3034 } 3035 3036 static void 3037 vtnet_start_taskqueues(struct vtnet_softc *sc) 3038 { 3039 device_t dev; 3040 struct vtnet_rxq *rxq; 3041 struct vtnet_txq *txq; 3042 int i, error; 3043 3044 dev = sc->vtnet_dev; 3045 3046 /* 3047 * Errors here are very difficult to recover from - we cannot 3048 * easily fail because, if this is during boot, we will hang 3049 * when freeing any successfully started taskqueues because 3050 * the scheduler isn't up yet. 3051 * 3052 * Most drivers just ignore the return value - it only fails 3053 * with ENOMEM so an error is not likely. 3054 */ 3055 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3056 rxq = &sc->vtnet_rxqs[i]; 3057 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3058 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3059 if (error) { 3060 device_printf(dev, "failed to start rx taskq %d\n", 3061 rxq->vtnrx_id); 3062 } 3063 3064 txq = &sc->vtnet_txqs[i]; 3065 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3066 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3067 if (error) { 3068 device_printf(dev, "failed to start tx taskq %d\n", 3069 txq->vtntx_id); 3070 } 3071 } 3072 } 3073 3074 static void 3075 vtnet_free_taskqueues(struct vtnet_softc *sc) 3076 { 3077 struct vtnet_rxq *rxq; 3078 struct vtnet_txq *txq; 3079 int i; 3080 3081 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3082 rxq = &sc->vtnet_rxqs[i]; 3083 if (rxq->vtnrx_tq != NULL) { 3084 taskqueue_free(rxq->vtnrx_tq); 3085 rxq->vtnrx_tq = NULL; 3086 } 3087 3088 txq = &sc->vtnet_txqs[i]; 3089 if (txq->vtntx_tq != NULL) { 3090 taskqueue_free(txq->vtntx_tq); 3091 txq->vtntx_tq = NULL; 3092 } 3093 } 3094 } 3095 3096 static void 3097 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3098 { 3099 struct vtnet_rxq *rxq; 3100 struct vtnet_txq *txq; 3101 int i; 3102 3103 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3104 rxq = &sc->vtnet_rxqs[i]; 3105 if (rxq->vtnrx_tq != NULL) 3106 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3107 3108 txq = &sc->vtnet_txqs[i]; 3109 if (txq->vtntx_tq != NULL) { 3110 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3111 #ifndef VTNET_LEGACY_TX 3112 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3113 #endif 3114 } 3115 } 3116 } 3117 3118 static void 3119 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3120 { 3121 struct vtnet_rxq *rxq; 3122 struct vtnet_txq *txq; 3123 int i; 3124 3125 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3126 rxq = &sc->vtnet_rxqs[i]; 3127 vtnet_rxq_free_mbufs(rxq); 3128 3129 txq = &sc->vtnet_txqs[i]; 3130 vtnet_txq_free_mbufs(txq); 3131 } 3132 } 3133 3134 static void 3135 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3136 { 3137 struct vtnet_rxq *rxq; 3138 struct vtnet_txq *txq; 3139 int i; 3140 3141 VTNET_CORE_LOCK_ASSERT(sc); 3142 3143 /* 3144 * Lock and unlock the per-queue mutex so we known the stop 3145 * state is visible. Doing only the active queues should be 3146 * sufficient, but it does not cost much extra to do all the 3147 * queues. 3148 */ 3149 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3150 rxq = &sc->vtnet_rxqs[i]; 3151 VTNET_RXQ_LOCK(rxq); 3152 VTNET_RXQ_UNLOCK(rxq); 3153 3154 txq = &sc->vtnet_txqs[i]; 3155 VTNET_TXQ_LOCK(txq); 3156 VTNET_TXQ_UNLOCK(txq); 3157 } 3158 } 3159 3160 static void 3161 vtnet_stop(struct vtnet_softc *sc) 3162 { 3163 device_t dev; 3164 struct ifnet *ifp; 3165 3166 dev = sc->vtnet_dev; 3167 ifp = sc->vtnet_ifp; 3168 3169 VTNET_CORE_LOCK_ASSERT(sc); 3170 3171 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3172 sc->vtnet_link_active = 0; 3173 callout_stop(&sc->vtnet_tick_ch); 3174 3175 /* Only advisory. */ 3176 vtnet_disable_interrupts(sc); 3177 3178 #ifdef DEV_NETMAP 3179 /* Stop any pending txsync/rxsync and disable them. */ 3180 netmap_disable_all_rings(ifp); 3181 #endif /* DEV_NETMAP */ 3182 3183 /* 3184 * Stop the host adapter. This resets it to the pre-initialized 3185 * state. It will not generate any interrupts until after it is 3186 * reinitialized. 3187 */ 3188 virtio_stop(dev); 3189 vtnet_stop_rendezvous(sc); 3190 3191 vtnet_drain_rxtx_queues(sc); 3192 sc->vtnet_act_vq_pairs = 1; 3193 } 3194 3195 static int 3196 vtnet_virtio_reinit(struct vtnet_softc *sc) 3197 { 3198 device_t dev; 3199 struct ifnet *ifp; 3200 uint64_t features; 3201 int error; 3202 3203 dev = sc->vtnet_dev; 3204 ifp = sc->vtnet_ifp; 3205 features = sc->vtnet_negotiated_features; 3206 3207 /* 3208 * Re-negotiate with the host, removing any disabled receive 3209 * features. Transmit features are disabled only on our side 3210 * via if_capenable and if_hwassist. 3211 */ 3212 3213 if ((ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3214 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3215 3216 if ((ifp->if_capenable & IFCAP_LRO) == 0) 3217 features &= ~VTNET_LRO_FEATURES; 3218 3219 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 3220 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3221 3222 error = virtio_reinit(dev, features); 3223 if (error) { 3224 device_printf(dev, "virtio reinit error %d\n", error); 3225 return (error); 3226 } 3227 3228 sc->vtnet_features = features; 3229 virtio_reinit_complete(dev); 3230 3231 return (0); 3232 } 3233 3234 static void 3235 vtnet_init_rx_filters(struct vtnet_softc *sc) 3236 { 3237 struct ifnet *ifp; 3238 3239 ifp = sc->vtnet_ifp; 3240 3241 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3242 vtnet_rx_filter(sc); 3243 vtnet_rx_filter_mac(sc); 3244 } 3245 3246 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 3247 vtnet_rx_filter_vlan(sc); 3248 } 3249 3250 static int 3251 vtnet_init_rx_queues(struct vtnet_softc *sc) 3252 { 3253 device_t dev; 3254 struct ifnet *ifp; 3255 struct vtnet_rxq *rxq; 3256 int i, clustersz, error; 3257 3258 dev = sc->vtnet_dev; 3259 ifp = sc->vtnet_ifp; 3260 3261 clustersz = vtnet_rx_cluster_size(sc, ifp->if_mtu); 3262 sc->vtnet_rx_clustersz = clustersz; 3263 3264 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3265 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3266 VTNET_MAX_RX_SIZE, clustersz); 3267 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3268 ("%s: too many rx mbufs %d for %d segments", __func__, 3269 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3270 } else 3271 sc->vtnet_rx_nmbufs = 1; 3272 3273 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3274 rxq = &sc->vtnet_rxqs[i]; 3275 3276 /* Hold the lock to satisfy asserts. */ 3277 VTNET_RXQ_LOCK(rxq); 3278 error = vtnet_rxq_populate(rxq); 3279 VTNET_RXQ_UNLOCK(rxq); 3280 3281 if (error) { 3282 device_printf(dev, "cannot populate Rx queue %d\n", i); 3283 return (error); 3284 } 3285 } 3286 3287 return (0); 3288 } 3289 3290 static int 3291 vtnet_init_tx_queues(struct vtnet_softc *sc) 3292 { 3293 struct vtnet_txq *txq; 3294 int i; 3295 3296 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3297 txq = &sc->vtnet_txqs[i]; 3298 txq->vtntx_watchdog = 0; 3299 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3300 #ifdef DEV_NETMAP 3301 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3302 #endif /* DEV_NETMAP */ 3303 } 3304 3305 return (0); 3306 } 3307 3308 static int 3309 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3310 { 3311 int error; 3312 3313 error = vtnet_init_rx_queues(sc); 3314 if (error) 3315 return (error); 3316 3317 error = vtnet_init_tx_queues(sc); 3318 if (error) 3319 return (error); 3320 3321 return (0); 3322 } 3323 3324 static void 3325 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3326 { 3327 device_t dev; 3328 int npairs; 3329 3330 dev = sc->vtnet_dev; 3331 3332 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3333 sc->vtnet_act_vq_pairs = 1; 3334 return; 3335 } 3336 3337 npairs = sc->vtnet_req_vq_pairs; 3338 3339 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3340 device_printf(dev, "cannot set active queue pairs to %d, " 3341 "falling back to 1 queue pair\n", npairs); 3342 npairs = 1; 3343 } 3344 3345 sc->vtnet_act_vq_pairs = npairs; 3346 } 3347 3348 static void 3349 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3350 { 3351 struct ifnet *ifp; 3352 uint64_t features; 3353 int error; 3354 3355 ifp = sc->vtnet_ifp; 3356 features = sc->vtnet_features; 3357 3358 VTNET_CORE_LOCK_ASSERT(sc); 3359 3360 if (ifp->if_capabilities & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3361 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3362 features |= VIRTIO_NET_F_GUEST_CSUM; 3363 else 3364 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3365 } 3366 3367 if (ifp->if_capabilities & IFCAP_LRO && !vtnet_software_lro(sc)) { 3368 if (ifp->if_capenable & IFCAP_LRO) 3369 features |= VTNET_LRO_FEATURES; 3370 else 3371 features &= ~VTNET_LRO_FEATURES; 3372 } 3373 3374 error = vtnet_ctrl_guest_offloads(sc, 3375 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3376 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3377 VIRTIO_NET_F_GUEST_UFO)); 3378 if (error) { 3379 device_printf(sc->vtnet_dev, 3380 "%s: cannot update Rx features\n", __func__); 3381 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 3382 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3383 vtnet_init_locked(sc, 0); 3384 } 3385 } else 3386 sc->vtnet_features = features; 3387 } 3388 3389 static int 3390 vtnet_reinit(struct vtnet_softc *sc) 3391 { 3392 device_t dev; 3393 struct ifnet *ifp; 3394 int error; 3395 3396 dev = sc->vtnet_dev; 3397 ifp = sc->vtnet_ifp; 3398 3399 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3400 3401 error = vtnet_virtio_reinit(sc); 3402 if (error) 3403 return (error); 3404 3405 vtnet_set_macaddr(sc); 3406 vtnet_set_active_vq_pairs(sc); 3407 3408 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3409 vtnet_init_rx_filters(sc); 3410 3411 ifp->if_hwassist = 0; 3412 if (ifp->if_capenable & IFCAP_TXCSUM) 3413 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3414 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3415 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3416 if (ifp->if_capenable & IFCAP_TSO4) 3417 ifp->if_hwassist |= CSUM_IP_TSO; 3418 if (ifp->if_capenable & IFCAP_TSO6) 3419 ifp->if_hwassist |= CSUM_IP6_TSO; 3420 3421 error = vtnet_init_rxtx_queues(sc); 3422 if (error) 3423 return (error); 3424 3425 return (0); 3426 } 3427 3428 static void 3429 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3430 { 3431 device_t dev; 3432 struct ifnet *ifp; 3433 3434 dev = sc->vtnet_dev; 3435 ifp = sc->vtnet_ifp; 3436 3437 VTNET_CORE_LOCK_ASSERT(sc); 3438 3439 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3440 return; 3441 3442 vtnet_stop(sc); 3443 3444 #ifdef DEV_NETMAP 3445 /* Once stopped we can update the netmap flags, if necessary. */ 3446 switch (init_mode) { 3447 case VTNET_INIT_NETMAP_ENTER: 3448 nm_set_native_flags(NA(ifp)); 3449 break; 3450 case VTNET_INIT_NETMAP_EXIT: 3451 nm_clear_native_flags(NA(ifp)); 3452 break; 3453 } 3454 #endif /* DEV_NETMAP */ 3455 3456 if (vtnet_reinit(sc) != 0) { 3457 vtnet_stop(sc); 3458 return; 3459 } 3460 3461 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3462 vtnet_update_link_status(sc); 3463 vtnet_enable_interrupts(sc); 3464 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3465 3466 #ifdef DEV_NETMAP 3467 /* Re-enable txsync/rxsync. */ 3468 netmap_enable_all_rings(ifp); 3469 #endif /* DEV_NETMAP */ 3470 } 3471 3472 static void 3473 vtnet_init(void *xsc) 3474 { 3475 struct vtnet_softc *sc; 3476 3477 sc = xsc; 3478 3479 VTNET_CORE_LOCK(sc); 3480 vtnet_init_locked(sc, 0); 3481 VTNET_CORE_UNLOCK(sc); 3482 } 3483 3484 static void 3485 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3486 { 3487 3488 /* 3489 * The control virtqueue is only polled and therefore it should 3490 * already be empty. 3491 */ 3492 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3493 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3494 } 3495 3496 static void 3497 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3498 struct sglist *sg, int readable, int writable) 3499 { 3500 struct virtqueue *vq; 3501 3502 vq = sc->vtnet_ctrl_vq; 3503 3504 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3505 VTNET_CORE_LOCK_ASSERT(sc); 3506 3507 if (!virtqueue_empty(vq)) 3508 return; 3509 3510 /* 3511 * Poll for the response, but the command is likely completed before 3512 * returning from the notify. 3513 */ 3514 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3515 virtqueue_notify(vq); 3516 virtqueue_poll(vq, NULL); 3517 } 3518 } 3519 3520 static int 3521 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3522 { 3523 struct sglist_seg segs[3]; 3524 struct sglist sg; 3525 struct { 3526 struct virtio_net_ctrl_hdr hdr __aligned(2); 3527 uint8_t pad1; 3528 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3529 uint8_t pad2; 3530 uint8_t ack; 3531 } s; 3532 int error; 3533 3534 error = 0; 3535 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3536 3537 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3538 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3539 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3540 s.ack = VIRTIO_NET_ERR; 3541 3542 sglist_init(&sg, nitems(segs), segs); 3543 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3544 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3545 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3546 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3547 3548 if (error == 0) 3549 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3550 3551 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3552 } 3553 3554 static int 3555 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3556 { 3557 struct sglist_seg segs[3]; 3558 struct sglist sg; 3559 struct { 3560 struct virtio_net_ctrl_hdr hdr __aligned(2); 3561 uint8_t pad1; 3562 uint64_t offloads __aligned(8); 3563 uint8_t pad2; 3564 uint8_t ack; 3565 } s; 3566 int error; 3567 3568 error = 0; 3569 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3570 3571 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3572 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3573 s.offloads = vtnet_gtoh64(sc, offloads); 3574 s.ack = VIRTIO_NET_ERR; 3575 3576 sglist_init(&sg, nitems(segs), segs); 3577 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3578 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3579 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3580 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3581 3582 if (error == 0) 3583 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3584 3585 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3586 } 3587 3588 static int 3589 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3590 { 3591 struct sglist_seg segs[3]; 3592 struct sglist sg; 3593 struct { 3594 struct virtio_net_ctrl_hdr hdr __aligned(2); 3595 uint8_t pad1; 3596 struct virtio_net_ctrl_mq mq __aligned(2); 3597 uint8_t pad2; 3598 uint8_t ack; 3599 } s; 3600 int error; 3601 3602 error = 0; 3603 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3604 3605 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3606 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3607 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3608 s.ack = VIRTIO_NET_ERR; 3609 3610 sglist_init(&sg, nitems(segs), segs); 3611 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3612 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3613 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3614 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3615 3616 if (error == 0) 3617 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3618 3619 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3620 } 3621 3622 static int 3623 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3624 { 3625 struct sglist_seg segs[3]; 3626 struct sglist sg; 3627 struct { 3628 struct virtio_net_ctrl_hdr hdr __aligned(2); 3629 uint8_t pad1; 3630 uint8_t onoff; 3631 uint8_t pad2; 3632 uint8_t ack; 3633 } s; 3634 int error; 3635 3636 error = 0; 3637 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3638 3639 s.hdr.class = VIRTIO_NET_CTRL_RX; 3640 s.hdr.cmd = cmd; 3641 s.onoff = on; 3642 s.ack = VIRTIO_NET_ERR; 3643 3644 sglist_init(&sg, nitems(segs), segs); 3645 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3646 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3647 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3648 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3649 3650 if (error == 0) 3651 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3652 3653 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3654 } 3655 3656 static int 3657 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3658 { 3659 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3660 } 3661 3662 static int 3663 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3664 { 3665 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3666 } 3667 3668 static void 3669 vtnet_rx_filter(struct vtnet_softc *sc) 3670 { 3671 device_t dev; 3672 struct ifnet *ifp; 3673 3674 dev = sc->vtnet_dev; 3675 ifp = sc->vtnet_ifp; 3676 3677 VTNET_CORE_LOCK_ASSERT(sc); 3678 3679 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) { 3680 device_printf(dev, "cannot %s promiscuous mode\n", 3681 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3682 } 3683 3684 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) { 3685 device_printf(dev, "cannot %s all-multicast mode\n", 3686 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3687 } 3688 } 3689 3690 static u_int 3691 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3692 { 3693 struct vtnet_softc *sc = arg; 3694 3695 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3696 return (0); 3697 3698 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3699 bcopy(LLADDR(sdl), 3700 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3701 ETHER_ADDR_LEN); 3702 3703 return (1); 3704 } 3705 3706 static u_int 3707 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3708 { 3709 struct vtnet_mac_filter *filter = arg; 3710 3711 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3712 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3713 ETHER_ADDR_LEN); 3714 3715 return (1); 3716 } 3717 3718 static void 3719 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3720 { 3721 struct virtio_net_ctrl_hdr hdr __aligned(2); 3722 struct vtnet_mac_filter *filter; 3723 struct sglist_seg segs[4]; 3724 struct sglist sg; 3725 struct ifnet *ifp; 3726 bool promisc, allmulti; 3727 u_int ucnt, mcnt; 3728 int error; 3729 uint8_t ack; 3730 3731 ifp = sc->vtnet_ifp; 3732 filter = sc->vtnet_mac_filter; 3733 error = 0; 3734 3735 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3736 VTNET_CORE_LOCK_ASSERT(sc); 3737 3738 /* Unicast MAC addresses: */ 3739 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3740 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3741 3742 if (promisc) { 3743 ucnt = 0; 3744 if_printf(ifp, "more than %d MAC addresses assigned, " 3745 "falling back to promiscuous mode\n", 3746 VTNET_MAX_MAC_ENTRIES); 3747 } 3748 3749 /* Multicast MAC addresses: */ 3750 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3751 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3752 3753 if (allmulti) { 3754 mcnt = 0; 3755 if_printf(ifp, "more than %d multicast MAC addresses " 3756 "assigned, falling back to all-multicast mode\n", 3757 VTNET_MAX_MAC_ENTRIES); 3758 } 3759 3760 if (promisc && allmulti) 3761 goto out; 3762 3763 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3764 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3765 3766 hdr.class = VIRTIO_NET_CTRL_MAC; 3767 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3768 ack = VIRTIO_NET_ERR; 3769 3770 sglist_init(&sg, nitems(segs), segs); 3771 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3772 error |= sglist_append(&sg, &filter->vmf_unicast, 3773 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3774 error |= sglist_append(&sg, &filter->vmf_multicast, 3775 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3776 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3777 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3778 3779 if (error == 0) 3780 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3781 if (ack != VIRTIO_NET_OK) 3782 if_printf(ifp, "error setting host MAC filter table\n"); 3783 3784 out: 3785 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3786 if_printf(ifp, "cannot enable promiscuous mode\n"); 3787 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3788 if_printf(ifp, "cannot enable all-multicast mode\n"); 3789 } 3790 3791 static int 3792 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3793 { 3794 struct sglist_seg segs[3]; 3795 struct sglist sg; 3796 struct { 3797 struct virtio_net_ctrl_hdr hdr __aligned(2); 3798 uint8_t pad1; 3799 uint16_t tag __aligned(2); 3800 uint8_t pad2; 3801 uint8_t ack; 3802 } s; 3803 int error; 3804 3805 error = 0; 3806 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3807 3808 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3809 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3810 s.tag = vtnet_gtoh16(sc, tag); 3811 s.ack = VIRTIO_NET_ERR; 3812 3813 sglist_init(&sg, nitems(segs), segs); 3814 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3815 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3816 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3817 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3818 3819 if (error == 0) 3820 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3821 3822 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3823 } 3824 3825 static void 3826 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3827 { 3828 int i, bit; 3829 uint32_t w; 3830 uint16_t tag; 3831 3832 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3833 VTNET_CORE_LOCK_ASSERT(sc); 3834 3835 /* Enable the filter for each configured VLAN. */ 3836 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3837 w = sc->vtnet_vlan_filter[i]; 3838 3839 while ((bit = ffs(w) - 1) != -1) { 3840 w &= ~(1 << bit); 3841 tag = sizeof(w) * CHAR_BIT * i + bit; 3842 3843 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3844 device_printf(sc->vtnet_dev, 3845 "cannot enable VLAN %d filter\n", tag); 3846 } 3847 } 3848 } 3849 } 3850 3851 static void 3852 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3853 { 3854 struct ifnet *ifp; 3855 int idx, bit; 3856 3857 ifp = sc->vtnet_ifp; 3858 idx = (tag >> 5) & 0x7F; 3859 bit = tag & 0x1F; 3860 3861 if (tag == 0 || tag > 4095) 3862 return; 3863 3864 VTNET_CORE_LOCK(sc); 3865 3866 if (add) 3867 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3868 else 3869 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3870 3871 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3872 ifp->if_drv_flags & IFF_DRV_RUNNING && 3873 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3874 device_printf(sc->vtnet_dev, 3875 "cannot %s VLAN %d %s the host filter table\n", 3876 add ? "add" : "remove", tag, add ? "to" : "from"); 3877 } 3878 3879 VTNET_CORE_UNLOCK(sc); 3880 } 3881 3882 static void 3883 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3884 { 3885 3886 if (ifp->if_softc != arg) 3887 return; 3888 3889 vtnet_update_vlan_filter(arg, 1, tag); 3890 } 3891 3892 static void 3893 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3894 { 3895 3896 if (ifp->if_softc != arg) 3897 return; 3898 3899 vtnet_update_vlan_filter(arg, 0, tag); 3900 } 3901 3902 static void 3903 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3904 { 3905 struct ifnet *ifp; 3906 uint32_t speed; 3907 3908 ifp = sc->vtnet_ifp; 3909 3910 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3911 return; 3912 3913 /* BMV: Ignore duplex. */ 3914 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3915 offsetof(struct virtio_net_config, speed)); 3916 if (speed != UINT32_MAX) 3917 ifp->if_baudrate = IF_Mbps(speed); 3918 } 3919 3920 static int 3921 vtnet_is_link_up(struct vtnet_softc *sc) 3922 { 3923 uint16_t status; 3924 3925 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3926 return (1); 3927 3928 status = virtio_read_dev_config_2(sc->vtnet_dev, 3929 offsetof(struct virtio_net_config, status)); 3930 3931 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3932 } 3933 3934 static void 3935 vtnet_update_link_status(struct vtnet_softc *sc) 3936 { 3937 struct ifnet *ifp; 3938 int link; 3939 3940 ifp = sc->vtnet_ifp; 3941 VTNET_CORE_LOCK_ASSERT(sc); 3942 link = vtnet_is_link_up(sc); 3943 3944 /* Notify if the link status has changed. */ 3945 if (link != 0 && sc->vtnet_link_active == 0) { 3946 vtnet_update_speed_duplex(sc); 3947 sc->vtnet_link_active = 1; 3948 if_link_state_change(ifp, LINK_STATE_UP); 3949 } else if (link == 0 && sc->vtnet_link_active != 0) { 3950 sc->vtnet_link_active = 0; 3951 if_link_state_change(ifp, LINK_STATE_DOWN); 3952 } 3953 } 3954 3955 static int 3956 vtnet_ifmedia_upd(struct ifnet *ifp __unused) 3957 { 3958 return (EOPNOTSUPP); 3959 } 3960 3961 static void 3962 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3963 { 3964 struct vtnet_softc *sc; 3965 3966 sc = ifp->if_softc; 3967 3968 ifmr->ifm_status = IFM_AVALID; 3969 ifmr->ifm_active = IFM_ETHER; 3970 3971 VTNET_CORE_LOCK(sc); 3972 if (vtnet_is_link_up(sc) != 0) { 3973 ifmr->ifm_status |= IFM_ACTIVE; 3974 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3975 } else 3976 ifmr->ifm_active |= IFM_NONE; 3977 VTNET_CORE_UNLOCK(sc); 3978 } 3979 3980 static void 3981 vtnet_get_macaddr(struct vtnet_softc *sc) 3982 { 3983 3984 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3985 virtio_read_device_config_array(sc->vtnet_dev, 3986 offsetof(struct virtio_net_config, mac), 3987 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 3988 } else { 3989 /* Generate a random locally administered unicast address. */ 3990 sc->vtnet_hwaddr[0] = 0xB2; 3991 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3992 } 3993 } 3994 3995 static void 3996 vtnet_set_macaddr(struct vtnet_softc *sc) 3997 { 3998 device_t dev; 3999 int error; 4000 4001 dev = sc->vtnet_dev; 4002 4003 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4004 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4005 if (error) 4006 device_printf(dev, "unable to set MAC address\n"); 4007 return; 4008 } 4009 4010 /* MAC in config is read-only in modern VirtIO. */ 4011 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4012 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4013 virtio_write_dev_config_1(dev, 4014 offsetof(struct virtio_net_config, mac) + i, 4015 sc->vtnet_hwaddr[i]); 4016 } 4017 } 4018 } 4019 4020 static void 4021 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4022 { 4023 4024 /* Assign MAC address if it was generated. */ 4025 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4026 vtnet_set_macaddr(sc); 4027 } 4028 4029 static void 4030 vtnet_vlan_tag_remove(struct mbuf *m) 4031 { 4032 struct ether_vlan_header *evh; 4033 4034 evh = mtod(m, struct ether_vlan_header *); 4035 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4036 m->m_flags |= M_VLANTAG; 4037 4038 /* Strip the 802.1Q header. */ 4039 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4040 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4041 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4042 } 4043 4044 static void 4045 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4046 { 4047 int limit; 4048 4049 limit = vtnet_tunable_int(sc, "rx_process_limit", 4050 vtnet_rx_process_limit); 4051 if (limit < 0) 4052 limit = INT_MAX; 4053 sc->vtnet_rx_process_limit = limit; 4054 } 4055 4056 static void 4057 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4058 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4059 { 4060 struct sysctl_oid *node; 4061 struct sysctl_oid_list *list; 4062 struct vtnet_rxq_stats *stats; 4063 char namebuf[16]; 4064 4065 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4066 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4067 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4068 list = SYSCTL_CHILDREN(node); 4069 4070 stats = &rxq->vtnrx_stats; 4071 4072 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4073 &stats->vrxs_ipackets, "Receive packets"); 4074 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4075 &stats->vrxs_ibytes, "Receive bytes"); 4076 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4077 &stats->vrxs_iqdrops, "Receive drops"); 4078 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4079 &stats->vrxs_ierrors, "Receive errors"); 4080 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4081 &stats->vrxs_csum, "Receive checksum offloaded"); 4082 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4083 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4084 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4085 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4086 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4087 &stats->vrxs_rescheduled, 4088 "Receive interrupt handler rescheduled"); 4089 } 4090 4091 static void 4092 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4093 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4094 { 4095 struct sysctl_oid *node; 4096 struct sysctl_oid_list *list; 4097 struct vtnet_txq_stats *stats; 4098 char namebuf[16]; 4099 4100 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4101 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4102 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4103 list = SYSCTL_CHILDREN(node); 4104 4105 stats = &txq->vtntx_stats; 4106 4107 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4108 &stats->vtxs_opackets, "Transmit packets"); 4109 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4110 &stats->vtxs_obytes, "Transmit bytes"); 4111 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4112 &stats->vtxs_omcasts, "Transmit multicasts"); 4113 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4114 &stats->vtxs_csum, "Transmit checksum offloaded"); 4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4116 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4117 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4118 &stats->vtxs_rescheduled, 4119 "Transmit interrupt handler rescheduled"); 4120 } 4121 4122 static void 4123 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4124 { 4125 device_t dev; 4126 struct sysctl_ctx_list *ctx; 4127 struct sysctl_oid *tree; 4128 struct sysctl_oid_list *child; 4129 int i; 4130 4131 dev = sc->vtnet_dev; 4132 ctx = device_get_sysctl_ctx(dev); 4133 tree = device_get_sysctl_tree(dev); 4134 child = SYSCTL_CHILDREN(tree); 4135 4136 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4137 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4138 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4139 } 4140 } 4141 4142 static void 4143 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4144 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4145 { 4146 struct vtnet_statistics *stats; 4147 struct vtnet_rxq_stats rxaccum; 4148 struct vtnet_txq_stats txaccum; 4149 4150 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4151 4152 stats = &sc->vtnet_stats; 4153 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4154 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4155 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4156 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4157 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4158 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4159 4160 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4161 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4162 "Mbuf cluster allocation failures"); 4163 4164 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4165 CTLFLAG_RD, &stats->rx_frame_too_large, 4166 "Received frame larger than the mbuf chain"); 4167 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4168 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4169 "Enqueuing the replacement receive mbuf failed"); 4170 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4171 CTLFLAG_RD, &stats->rx_mergeable_failed, 4172 "Mergeable buffers receive failures"); 4173 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4174 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4175 "Received checksum offloaded buffer with unsupported " 4176 "Ethernet type"); 4177 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4178 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4179 "Received checksum offloaded buffer with incorrect IP protocol"); 4180 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4181 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4182 "Received checksum offloaded buffer with incorrect offset"); 4183 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4184 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4185 "Received checksum offloaded buffer with incorrect protocol"); 4186 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4187 CTLFLAG_RD, &stats->rx_csum_failed, 4188 "Received buffer checksum offload failed"); 4189 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4190 CTLFLAG_RD, &stats->rx_csum_offloaded, 4191 "Received buffer checksum offload succeeded"); 4192 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4193 CTLFLAG_RD, &stats->rx_task_rescheduled, 4194 "Times the receive interrupt task rescheduled itself"); 4195 4196 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4197 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4198 "Aborted transmit of checksum offloaded buffer with unknown " 4199 "Ethernet type"); 4200 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4201 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4202 "Aborted transmit of checksum offloaded buffer because mismatched " 4203 "protocols"); 4204 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4205 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4206 "Aborted transmit of TSO buffer with non TCP protocol"); 4207 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4208 CTLFLAG_RD, &stats->tx_tso_without_csum, 4209 "Aborted transmit of TSO buffer without TCP checksum offload"); 4210 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4211 CTLFLAG_RD, &stats->tx_defragged, 4212 "Transmit mbufs defragged"); 4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4214 CTLFLAG_RD, &stats->tx_defrag_failed, 4215 "Aborted transmit of buffer because defrag failed"); 4216 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4217 CTLFLAG_RD, &stats->tx_csum_offloaded, 4218 "Offloaded checksum of transmitted buffer"); 4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4220 CTLFLAG_RD, &stats->tx_tso_offloaded, 4221 "Segmentation offload of transmitted buffer"); 4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4223 CTLFLAG_RD, &stats->tx_task_rescheduled, 4224 "Times the transmit interrupt task rescheduled itself"); 4225 } 4226 4227 static void 4228 vtnet_setup_sysctl(struct vtnet_softc *sc) 4229 { 4230 device_t dev; 4231 struct sysctl_ctx_list *ctx; 4232 struct sysctl_oid *tree; 4233 struct sysctl_oid_list *child; 4234 4235 dev = sc->vtnet_dev; 4236 ctx = device_get_sysctl_ctx(dev); 4237 tree = device_get_sysctl_tree(dev); 4238 child = SYSCTL_CHILDREN(tree); 4239 4240 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4241 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4242 "Number of maximum supported virtqueue pairs"); 4243 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4244 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4245 "Number of requested virtqueue pairs"); 4246 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4247 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4248 "Number of active virtqueue pairs"); 4249 4250 vtnet_setup_stat_sysctl(ctx, child, sc); 4251 } 4252 4253 static void 4254 vtnet_load_tunables(struct vtnet_softc *sc) 4255 { 4256 4257 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4258 "lro_entry_count", vtnet_lro_entry_count); 4259 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4260 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4261 4262 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4263 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4264 } 4265 4266 static int 4267 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4268 { 4269 4270 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4271 } 4272 4273 static void 4274 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4275 { 4276 4277 virtqueue_disable_intr(rxq->vtnrx_vq); 4278 } 4279 4280 static int 4281 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4282 { 4283 struct virtqueue *vq; 4284 4285 vq = txq->vtntx_vq; 4286 4287 if (vtnet_txq_below_threshold(txq) != 0) 4288 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4289 4290 /* 4291 * The free count is above our threshold. Keep the Tx interrupt 4292 * disabled until the queue is fuller. 4293 */ 4294 return (0); 4295 } 4296 4297 static void 4298 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4299 { 4300 4301 virtqueue_disable_intr(txq->vtntx_vq); 4302 } 4303 4304 static void 4305 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4306 { 4307 struct vtnet_rxq *rxq; 4308 int i; 4309 4310 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4311 rxq = &sc->vtnet_rxqs[i]; 4312 if (vtnet_rxq_enable_intr(rxq) != 0) 4313 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4314 } 4315 } 4316 4317 static void 4318 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4319 { 4320 int i; 4321 4322 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4323 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4324 } 4325 4326 static void 4327 vtnet_enable_interrupts(struct vtnet_softc *sc) 4328 { 4329 4330 vtnet_enable_rx_interrupts(sc); 4331 vtnet_enable_tx_interrupts(sc); 4332 } 4333 4334 static void 4335 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4336 { 4337 int i; 4338 4339 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4340 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4341 } 4342 4343 static void 4344 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4345 { 4346 int i; 4347 4348 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4349 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4350 } 4351 4352 static void 4353 vtnet_disable_interrupts(struct vtnet_softc *sc) 4354 { 4355 4356 vtnet_disable_rx_interrupts(sc); 4357 vtnet_disable_tx_interrupts(sc); 4358 } 4359 4360 static int 4361 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4362 { 4363 char path[64]; 4364 4365 snprintf(path, sizeof(path), 4366 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4367 TUNABLE_INT_FETCH(path, &def); 4368 4369 return (def); 4370 } 4371 4372 #ifdef DEBUGNET 4373 static void 4374 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4375 { 4376 struct vtnet_softc *sc; 4377 4378 sc = if_getsoftc(ifp); 4379 4380 VTNET_CORE_LOCK(sc); 4381 *nrxr = sc->vtnet_req_vq_pairs; 4382 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4383 *clsize = sc->vtnet_rx_clustersz; 4384 VTNET_CORE_UNLOCK(sc); 4385 } 4386 4387 static void 4388 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4389 { 4390 } 4391 4392 static int 4393 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4394 { 4395 struct vtnet_softc *sc; 4396 struct vtnet_txq *txq; 4397 int error; 4398 4399 sc = if_getsoftc(ifp); 4400 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4401 IFF_DRV_RUNNING) 4402 return (EBUSY); 4403 4404 txq = &sc->vtnet_txqs[0]; 4405 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4406 if (error == 0) 4407 (void)vtnet_txq_notify(txq); 4408 return (error); 4409 } 4410 4411 static int 4412 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4413 { 4414 struct vtnet_softc *sc; 4415 int i; 4416 4417 sc = if_getsoftc(ifp); 4418 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4419 IFF_DRV_RUNNING) 4420 return (EBUSY); 4421 4422 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4423 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4424 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4425 return (0); 4426 } 4427 #endif /* DEBUGNET */ 4428