1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/eventhandler.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/module.h> 42 #include <sys/msan.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/random.h> 46 #include <sys/sglist.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/taskqueue.h> 50 #include <sys/smp.h> 51 #include <machine/smp.h> 52 53 #include <vm/uma.h> 54 55 #include <net/debugnet.h> 56 #include <net/ethernet.h> 57 #include <net/pfil.h> 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_arp.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_media.h> 64 #include <net/if_vlan_var.h> 65 66 #include <net/bpf.h> 67 68 #include <netinet/in_systm.h> 69 #include <netinet/in.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip6.h> 72 #include <netinet6/ip6_var.h> 73 #include <netinet/udp.h> 74 #include <netinet/tcp.h> 75 #include <netinet/tcp_lro.h> 76 77 #include <machine/bus.h> 78 #include <machine/resource.h> 79 #include <sys/bus.h> 80 #include <sys/rman.h> 81 82 #include <dev/virtio/virtio.h> 83 #include <dev/virtio/virtqueue.h> 84 #include <dev/virtio/network/virtio_net.h> 85 #include <dev/virtio/network/if_vtnetvar.h> 86 #include "virtio_if.h" 87 88 #include "opt_inet.h" 89 #include "opt_inet6.h" 90 91 #if defined(INET) || defined(INET6) 92 #include <machine/in_cksum.h> 93 #endif 94 95 static int vtnet_modevent(module_t, int, void *); 96 97 static int vtnet_probe(device_t); 98 static int vtnet_attach(device_t); 99 static int vtnet_detach(device_t); 100 static int vtnet_suspend(device_t); 101 static int vtnet_resume(device_t); 102 static int vtnet_shutdown(device_t); 103 static int vtnet_attach_completed(device_t); 104 static int vtnet_config_change(device_t); 105 106 static int vtnet_negotiate_features(struct vtnet_softc *); 107 static int vtnet_setup_features(struct vtnet_softc *); 108 static int vtnet_init_rxq(struct vtnet_softc *, int); 109 static int vtnet_init_txq(struct vtnet_softc *, int); 110 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 111 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 112 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 113 static void vtnet_free_rx_filters(struct vtnet_softc *); 114 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 115 static int vtnet_alloc_interface(struct vtnet_softc *); 116 static int vtnet_setup_interface(struct vtnet_softc *); 117 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 118 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 119 static int vtnet_ioctl_multi(struct vtnet_softc *); 120 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 121 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t); 122 static uint64_t vtnet_get_counter(struct ifnet *, ift_counter); 123 124 static int vtnet_rxq_populate(struct vtnet_rxq *); 125 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 126 static struct mbuf * 127 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 128 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 129 struct mbuf *, int); 130 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 131 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 132 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 133 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 134 uint16_t, int, struct virtio_net_hdr *); 135 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 136 uint16_t, int, struct virtio_net_hdr *); 137 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 138 struct virtio_net_hdr *); 139 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 140 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 141 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 142 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 143 struct virtio_net_hdr *); 144 static int vtnet_rxq_eof(struct vtnet_rxq *); 145 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 146 static void vtnet_rx_vq_intr(void *); 147 static void vtnet_rxq_tq_intr(void *, int); 148 149 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 150 static int vtnet_txq_below_threshold(struct vtnet_txq *); 151 static int vtnet_txq_notify(struct vtnet_txq *); 152 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 153 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 154 int *, int *, int *); 155 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 156 int, struct virtio_net_hdr *); 157 static struct mbuf * 158 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 159 struct virtio_net_hdr *); 160 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 161 struct vtnet_tx_header *); 162 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 163 #ifdef VTNET_LEGACY_TX 164 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *); 165 static void vtnet_start(struct ifnet *); 166 #else 167 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 168 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *); 169 static void vtnet_txq_tq_deferred(void *, int); 170 #endif 171 static void vtnet_txq_start(struct vtnet_txq *); 172 static void vtnet_txq_tq_intr(void *, int); 173 static int vtnet_txq_eof(struct vtnet_txq *); 174 static void vtnet_tx_vq_intr(void *); 175 static void vtnet_tx_start_all(struct vtnet_softc *); 176 177 #ifndef VTNET_LEGACY_TX 178 static void vtnet_qflush(struct ifnet *); 179 #endif 180 181 static int vtnet_watchdog(struct vtnet_txq *); 182 static void vtnet_accum_stats(struct vtnet_softc *, 183 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 184 static void vtnet_tick(void *); 185 186 static void vtnet_start_taskqueues(struct vtnet_softc *); 187 static void vtnet_free_taskqueues(struct vtnet_softc *); 188 static void vtnet_drain_taskqueues(struct vtnet_softc *); 189 190 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 191 static void vtnet_stop_rendezvous(struct vtnet_softc *); 192 static void vtnet_stop(struct vtnet_softc *); 193 static int vtnet_virtio_reinit(struct vtnet_softc *); 194 static void vtnet_init_rx_filters(struct vtnet_softc *); 195 static int vtnet_init_rx_queues(struct vtnet_softc *); 196 static int vtnet_init_tx_queues(struct vtnet_softc *); 197 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 198 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 199 static void vtnet_update_rx_offloads(struct vtnet_softc *); 200 static int vtnet_reinit(struct vtnet_softc *); 201 static void vtnet_init_locked(struct vtnet_softc *, int); 202 static void vtnet_init(void *); 203 204 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 205 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 206 struct sglist *, int, int); 207 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 208 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 209 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 210 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 211 static int vtnet_set_promisc(struct vtnet_softc *, bool); 212 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 213 static void vtnet_rx_filter(struct vtnet_softc *); 214 static void vtnet_rx_filter_mac(struct vtnet_softc *); 215 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 216 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 217 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 218 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 219 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 220 221 static void vtnet_update_speed_duplex(struct vtnet_softc *); 222 static int vtnet_is_link_up(struct vtnet_softc *); 223 static void vtnet_update_link_status(struct vtnet_softc *); 224 static int vtnet_ifmedia_upd(struct ifnet *); 225 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 226 static void vtnet_get_macaddr(struct vtnet_softc *); 227 static void vtnet_set_macaddr(struct vtnet_softc *); 228 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 229 static void vtnet_vlan_tag_remove(struct mbuf *); 230 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 231 232 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 233 struct sysctl_oid_list *, struct vtnet_rxq *); 234 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 235 struct sysctl_oid_list *, struct vtnet_txq *); 236 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 237 static void vtnet_load_tunables(struct vtnet_softc *); 238 static void vtnet_setup_sysctl(struct vtnet_softc *); 239 240 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 241 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 242 static int vtnet_txq_enable_intr(struct vtnet_txq *); 243 static void vtnet_txq_disable_intr(struct vtnet_txq *); 244 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 245 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 246 static void vtnet_enable_interrupts(struct vtnet_softc *); 247 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 248 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 249 static void vtnet_disable_interrupts(struct vtnet_softc *); 250 251 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 252 253 DEBUGNET_DEFINE(vtnet); 254 255 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 256 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 257 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 258 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 259 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 260 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 261 262 /* Tunables. */ 263 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 264 "VirtIO Net driver parameters"); 265 266 static int vtnet_csum_disable = 0; 267 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 268 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 269 270 static int vtnet_fixup_needs_csum = 0; 271 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 272 &vtnet_fixup_needs_csum, 0, 273 "Calculate valid checksum for NEEDS_CSUM packets"); 274 275 static int vtnet_tso_disable = 0; 276 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 277 &vtnet_tso_disable, 0, "Disables TSO"); 278 279 static int vtnet_lro_disable = 0; 280 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 281 &vtnet_lro_disable, 0, "Disables hardware LRO"); 282 283 static int vtnet_mq_disable = 0; 284 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 285 &vtnet_mq_disable, 0, "Disables multiqueue support"); 286 287 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 288 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 289 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 290 291 static int vtnet_tso_maxlen = IP_MAXPACKET; 292 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 293 &vtnet_tso_maxlen, 0, "TSO burst limit"); 294 295 static int vtnet_rx_process_limit = 1024; 296 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 297 &vtnet_rx_process_limit, 0, 298 "Number of RX segments processed in one pass"); 299 300 static int vtnet_lro_entry_count = 128; 301 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 302 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 303 304 /* Enable sorted LRO, and the depth of the mbuf queue. */ 305 static int vtnet_lro_mbufq_depth = 0; 306 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 307 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 308 309 static uma_zone_t vtnet_tx_header_zone; 310 311 static struct virtio_feature_desc vtnet_feature_desc[] = { 312 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 313 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 314 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 315 { VIRTIO_NET_F_MAC, "MAC" }, 316 { VIRTIO_NET_F_GSO, "TxGSO" }, 317 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 318 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 319 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 320 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 321 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 322 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 323 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 324 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 325 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 326 { VIRTIO_NET_F_STATUS, "Status" }, 327 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 328 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 329 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 330 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 331 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 332 { VIRTIO_NET_F_MQ, "Multiqueue" }, 333 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 334 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 335 336 { 0, NULL } 337 }; 338 339 static device_method_t vtnet_methods[] = { 340 /* Device methods. */ 341 DEVMETHOD(device_probe, vtnet_probe), 342 DEVMETHOD(device_attach, vtnet_attach), 343 DEVMETHOD(device_detach, vtnet_detach), 344 DEVMETHOD(device_suspend, vtnet_suspend), 345 DEVMETHOD(device_resume, vtnet_resume), 346 DEVMETHOD(device_shutdown, vtnet_shutdown), 347 348 /* VirtIO methods. */ 349 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 350 DEVMETHOD(virtio_config_change, vtnet_config_change), 351 352 DEVMETHOD_END 353 }; 354 355 #ifdef DEV_NETMAP 356 #include <dev/netmap/if_vtnet_netmap.h> 357 #endif 358 359 static driver_t vtnet_driver = { 360 .name = "vtnet", 361 .methods = vtnet_methods, 362 .size = sizeof(struct vtnet_softc) 363 }; 364 static devclass_t vtnet_devclass; 365 366 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_devclass, 367 vtnet_modevent, 0); 368 MODULE_VERSION(vtnet, 1); 369 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 370 #ifdef DEV_NETMAP 371 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 372 #endif 373 374 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 375 376 static int 377 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 378 { 379 int error = 0; 380 static int loaded = 0; 381 382 switch (type) { 383 case MOD_LOAD: 384 if (loaded++ == 0) { 385 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 386 sizeof(struct vtnet_tx_header), 387 NULL, NULL, NULL, NULL, 0, 0); 388 #ifdef DEBUGNET 389 /* 390 * We need to allocate from this zone in the transmit path, so ensure 391 * that we have at least one item per header available. 392 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 393 * buckets 394 */ 395 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 396 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 397 #endif 398 } 399 break; 400 case MOD_QUIESCE: 401 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 402 error = EBUSY; 403 break; 404 case MOD_UNLOAD: 405 if (--loaded == 0) { 406 uma_zdestroy(vtnet_tx_header_zone); 407 vtnet_tx_header_zone = NULL; 408 } 409 break; 410 case MOD_SHUTDOWN: 411 break; 412 default: 413 error = EOPNOTSUPP; 414 break; 415 } 416 417 return (error); 418 } 419 420 static int 421 vtnet_probe(device_t dev) 422 { 423 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 424 } 425 426 static int 427 vtnet_attach(device_t dev) 428 { 429 struct vtnet_softc *sc; 430 int error; 431 432 sc = device_get_softc(dev); 433 sc->vtnet_dev = dev; 434 virtio_set_feature_desc(dev, vtnet_feature_desc); 435 436 VTNET_CORE_LOCK_INIT(sc); 437 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 438 vtnet_load_tunables(sc); 439 440 error = vtnet_alloc_interface(sc); 441 if (error) { 442 device_printf(dev, "cannot allocate interface\n"); 443 goto fail; 444 } 445 446 vtnet_setup_sysctl(sc); 447 448 error = vtnet_setup_features(sc); 449 if (error) { 450 device_printf(dev, "cannot setup features\n"); 451 goto fail; 452 } 453 454 error = vtnet_alloc_rx_filters(sc); 455 if (error) { 456 device_printf(dev, "cannot allocate Rx filters\n"); 457 goto fail; 458 } 459 460 error = vtnet_alloc_rxtx_queues(sc); 461 if (error) { 462 device_printf(dev, "cannot allocate queues\n"); 463 goto fail; 464 } 465 466 error = vtnet_alloc_virtqueues(sc); 467 if (error) { 468 device_printf(dev, "cannot allocate virtqueues\n"); 469 goto fail; 470 } 471 472 error = vtnet_setup_interface(sc); 473 if (error) { 474 device_printf(dev, "cannot setup interface\n"); 475 goto fail; 476 } 477 478 error = virtio_setup_intr(dev, INTR_TYPE_NET); 479 if (error) { 480 device_printf(dev, "cannot setup interrupts\n"); 481 ether_ifdetach(sc->vtnet_ifp); 482 goto fail; 483 } 484 485 #ifdef DEV_NETMAP 486 vtnet_netmap_attach(sc); 487 #endif 488 vtnet_start_taskqueues(sc); 489 490 fail: 491 if (error) 492 vtnet_detach(dev); 493 494 return (error); 495 } 496 497 static int 498 vtnet_detach(device_t dev) 499 { 500 struct vtnet_softc *sc; 501 struct ifnet *ifp; 502 503 sc = device_get_softc(dev); 504 ifp = sc->vtnet_ifp; 505 506 if (device_is_attached(dev)) { 507 VTNET_CORE_LOCK(sc); 508 vtnet_stop(sc); 509 VTNET_CORE_UNLOCK(sc); 510 511 callout_drain(&sc->vtnet_tick_ch); 512 vtnet_drain_taskqueues(sc); 513 514 ether_ifdetach(ifp); 515 } 516 517 #ifdef DEV_NETMAP 518 netmap_detach(ifp); 519 #endif 520 521 if (sc->vtnet_pfil != NULL) { 522 pfil_head_unregister(sc->vtnet_pfil); 523 sc->vtnet_pfil = NULL; 524 } 525 526 vtnet_free_taskqueues(sc); 527 528 if (sc->vtnet_vlan_attach != NULL) { 529 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 530 sc->vtnet_vlan_attach = NULL; 531 } 532 if (sc->vtnet_vlan_detach != NULL) { 533 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 534 sc->vtnet_vlan_detach = NULL; 535 } 536 537 ifmedia_removeall(&sc->vtnet_media); 538 539 if (ifp != NULL) { 540 if_free(ifp); 541 sc->vtnet_ifp = NULL; 542 } 543 544 vtnet_free_rxtx_queues(sc); 545 vtnet_free_rx_filters(sc); 546 547 if (sc->vtnet_ctrl_vq != NULL) 548 vtnet_free_ctrl_vq(sc); 549 550 VTNET_CORE_LOCK_DESTROY(sc); 551 552 return (0); 553 } 554 555 static int 556 vtnet_suspend(device_t dev) 557 { 558 struct vtnet_softc *sc; 559 560 sc = device_get_softc(dev); 561 562 VTNET_CORE_LOCK(sc); 563 vtnet_stop(sc); 564 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 565 VTNET_CORE_UNLOCK(sc); 566 567 return (0); 568 } 569 570 static int 571 vtnet_resume(device_t dev) 572 { 573 struct vtnet_softc *sc; 574 struct ifnet *ifp; 575 576 sc = device_get_softc(dev); 577 ifp = sc->vtnet_ifp; 578 579 VTNET_CORE_LOCK(sc); 580 if (ifp->if_flags & IFF_UP) 581 vtnet_init_locked(sc, 0); 582 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 583 VTNET_CORE_UNLOCK(sc); 584 585 return (0); 586 } 587 588 static int 589 vtnet_shutdown(device_t dev) 590 { 591 /* 592 * Suspend already does all of what we need to 593 * do here; we just never expect to be resumed. 594 */ 595 return (vtnet_suspend(dev)); 596 } 597 598 static int 599 vtnet_attach_completed(device_t dev) 600 { 601 struct vtnet_softc *sc; 602 603 sc = device_get_softc(dev); 604 605 VTNET_CORE_LOCK(sc); 606 vtnet_attached_set_macaddr(sc); 607 VTNET_CORE_UNLOCK(sc); 608 609 return (0); 610 } 611 612 static int 613 vtnet_config_change(device_t dev) 614 { 615 struct vtnet_softc *sc; 616 617 sc = device_get_softc(dev); 618 619 VTNET_CORE_LOCK(sc); 620 vtnet_update_link_status(sc); 621 if (sc->vtnet_link_active != 0) 622 vtnet_tx_start_all(sc); 623 VTNET_CORE_UNLOCK(sc); 624 625 return (0); 626 } 627 628 static int 629 vtnet_negotiate_features(struct vtnet_softc *sc) 630 { 631 device_t dev; 632 uint64_t features, negotiated_features; 633 int no_csum; 634 635 dev = sc->vtnet_dev; 636 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 637 VTNET_LEGACY_FEATURES; 638 639 /* 640 * TSO and LRO are only available when their corresponding checksum 641 * offload feature is also negotiated. 642 */ 643 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 644 if (no_csum) 645 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 646 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 647 features &= ~VTNET_TSO_FEATURES; 648 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 649 features &= ~VTNET_LRO_FEATURES; 650 651 #ifndef VTNET_LEGACY_TX 652 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 653 features &= ~VIRTIO_NET_F_MQ; 654 #else 655 features &= ~VIRTIO_NET_F_MQ; 656 #endif 657 658 negotiated_features = virtio_negotiate_features(dev, features); 659 660 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 661 uint16_t mtu; 662 663 mtu = virtio_read_dev_config_2(dev, 664 offsetof(struct virtio_net_config, mtu)); 665 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 666 device_printf(dev, "Invalid MTU value: %d. " 667 "MTU feature disabled.\n", mtu); 668 features &= ~VIRTIO_NET_F_MTU; 669 negotiated_features = 670 virtio_negotiate_features(dev, features); 671 } 672 } 673 674 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 675 uint16_t npairs; 676 677 npairs = virtio_read_dev_config_2(dev, 678 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 679 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 680 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 681 device_printf(dev, "Invalid max_virtqueue_pairs value: " 682 "%d. Multiqueue feature disabled.\n", npairs); 683 features &= ~VIRTIO_NET_F_MQ; 684 negotiated_features = 685 virtio_negotiate_features(dev, features); 686 } 687 } 688 689 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 690 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 691 /* 692 * LRO without mergeable buffers requires special care. This 693 * is not ideal because every receive buffer must be large 694 * enough to hold the maximum TCP packet, the Ethernet header, 695 * and the header. This requires up to 34 descriptors with 696 * MCLBYTES clusters. If we do not have indirect descriptors, 697 * LRO is disabled since the virtqueue will not contain very 698 * many receive buffers. 699 */ 700 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 701 device_printf(dev, 702 "Host LRO disabled since both mergeable buffers " 703 "and indirect descriptors were not negotiated\n"); 704 features &= ~VTNET_LRO_FEATURES; 705 negotiated_features = 706 virtio_negotiate_features(dev, features); 707 } else 708 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 709 } 710 711 sc->vtnet_features = negotiated_features; 712 sc->vtnet_negotiated_features = negotiated_features; 713 714 return (virtio_finalize_features(dev)); 715 } 716 717 static int 718 vtnet_setup_features(struct vtnet_softc *sc) 719 { 720 device_t dev; 721 int error; 722 723 dev = sc->vtnet_dev; 724 725 error = vtnet_negotiate_features(sc); 726 if (error) 727 return (error); 728 729 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 730 sc->vtnet_flags |= VTNET_FLAG_MODERN; 731 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 732 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 733 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 734 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 735 736 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 737 /* This feature should always be negotiated. */ 738 sc->vtnet_flags |= VTNET_FLAG_MAC; 739 } 740 741 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 742 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 743 offsetof(struct virtio_net_config, mtu)); 744 } else 745 sc->vtnet_max_mtu = VTNET_MAX_MTU; 746 747 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 748 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 750 } else if (vtnet_modern(sc)) { 751 /* This is identical to the mergeable header. */ 752 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 753 } else 754 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 755 756 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 757 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 758 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 759 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 760 else 761 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 762 763 /* 764 * Favor "hardware" LRO if negotiated, but support software LRO as 765 * a fallback; there is usually little benefit (or worse) with both. 766 */ 767 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 768 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 769 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 770 771 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 772 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 773 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 774 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 775 else 776 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 777 778 sc->vtnet_req_vq_pairs = 1; 779 sc->vtnet_max_vq_pairs = 1; 780 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 782 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 783 784 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 785 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 786 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 787 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 788 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 789 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 790 791 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 792 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 793 offsetof(struct virtio_net_config, 794 max_virtqueue_pairs)); 795 } 796 } 797 798 if (sc->vtnet_max_vq_pairs > 1) { 799 int req; 800 801 /* 802 * Limit the maximum number of requested queue pairs to the 803 * number of CPUs and the configured maximum. 804 */ 805 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 806 if (req < 0) 807 req = 1; 808 if (req == 0) 809 req = mp_ncpus; 810 if (req > sc->vtnet_max_vq_pairs) 811 req = sc->vtnet_max_vq_pairs; 812 if (req > mp_ncpus) 813 req = mp_ncpus; 814 if (req > 1) { 815 sc->vtnet_req_vq_pairs = req; 816 sc->vtnet_flags |= VTNET_FLAG_MQ; 817 } 818 } 819 820 return (0); 821 } 822 823 static int 824 vtnet_init_rxq(struct vtnet_softc *sc, int id) 825 { 826 struct vtnet_rxq *rxq; 827 828 rxq = &sc->vtnet_rxqs[id]; 829 830 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 831 device_get_nameunit(sc->vtnet_dev), id); 832 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 833 834 rxq->vtnrx_sc = sc; 835 rxq->vtnrx_id = id; 836 837 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 838 if (rxq->vtnrx_sg == NULL) 839 return (ENOMEM); 840 841 #if defined(INET) || defined(INET6) 842 if (vtnet_software_lro(sc)) { 843 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 844 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 845 return (ENOMEM); 846 } 847 #endif 848 849 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 850 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 851 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 852 853 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 854 } 855 856 static int 857 vtnet_init_txq(struct vtnet_softc *sc, int id) 858 { 859 struct vtnet_txq *txq; 860 861 txq = &sc->vtnet_txqs[id]; 862 863 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 864 device_get_nameunit(sc->vtnet_dev), id); 865 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 866 867 txq->vtntx_sc = sc; 868 txq->vtntx_id = id; 869 870 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 871 if (txq->vtntx_sg == NULL) 872 return (ENOMEM); 873 874 #ifndef VTNET_LEGACY_TX 875 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 876 M_NOWAIT, &txq->vtntx_mtx); 877 if (txq->vtntx_br == NULL) 878 return (ENOMEM); 879 880 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 881 #endif 882 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 883 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 884 taskqueue_thread_enqueue, &txq->vtntx_tq); 885 if (txq->vtntx_tq == NULL) 886 return (ENOMEM); 887 888 return (0); 889 } 890 891 static int 892 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 893 { 894 int i, npairs, error; 895 896 npairs = sc->vtnet_max_vq_pairs; 897 898 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 899 M_NOWAIT | M_ZERO); 900 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 901 M_NOWAIT | M_ZERO); 902 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 903 return (ENOMEM); 904 905 for (i = 0; i < npairs; i++) { 906 error = vtnet_init_rxq(sc, i); 907 if (error) 908 return (error); 909 error = vtnet_init_txq(sc, i); 910 if (error) 911 return (error); 912 } 913 914 vtnet_set_rx_process_limit(sc); 915 vtnet_setup_queue_sysctl(sc); 916 917 return (0); 918 } 919 920 static void 921 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 922 { 923 924 rxq->vtnrx_sc = NULL; 925 rxq->vtnrx_id = -1; 926 927 #if defined(INET) || defined(INET6) 928 tcp_lro_free(&rxq->vtnrx_lro); 929 #endif 930 931 if (rxq->vtnrx_sg != NULL) { 932 sglist_free(rxq->vtnrx_sg); 933 rxq->vtnrx_sg = NULL; 934 } 935 936 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 937 mtx_destroy(&rxq->vtnrx_mtx); 938 } 939 940 static void 941 vtnet_destroy_txq(struct vtnet_txq *txq) 942 { 943 944 txq->vtntx_sc = NULL; 945 txq->vtntx_id = -1; 946 947 if (txq->vtntx_sg != NULL) { 948 sglist_free(txq->vtntx_sg); 949 txq->vtntx_sg = NULL; 950 } 951 952 #ifndef VTNET_LEGACY_TX 953 if (txq->vtntx_br != NULL) { 954 buf_ring_free(txq->vtntx_br, M_DEVBUF); 955 txq->vtntx_br = NULL; 956 } 957 #endif 958 959 if (mtx_initialized(&txq->vtntx_mtx) != 0) 960 mtx_destroy(&txq->vtntx_mtx); 961 } 962 963 static void 964 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 965 { 966 int i; 967 968 if (sc->vtnet_rxqs != NULL) { 969 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 970 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 971 free(sc->vtnet_rxqs, M_DEVBUF); 972 sc->vtnet_rxqs = NULL; 973 } 974 975 if (sc->vtnet_txqs != NULL) { 976 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 977 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 978 free(sc->vtnet_txqs, M_DEVBUF); 979 sc->vtnet_txqs = NULL; 980 } 981 } 982 983 static int 984 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 985 { 986 987 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 988 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 989 M_DEVBUF, M_NOWAIT | M_ZERO); 990 if (sc->vtnet_mac_filter == NULL) 991 return (ENOMEM); 992 } 993 994 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 995 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 996 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 997 if (sc->vtnet_vlan_filter == NULL) 998 return (ENOMEM); 999 } 1000 1001 return (0); 1002 } 1003 1004 static void 1005 vtnet_free_rx_filters(struct vtnet_softc *sc) 1006 { 1007 1008 if (sc->vtnet_mac_filter != NULL) { 1009 free(sc->vtnet_mac_filter, M_DEVBUF); 1010 sc->vtnet_mac_filter = NULL; 1011 } 1012 1013 if (sc->vtnet_vlan_filter != NULL) { 1014 free(sc->vtnet_vlan_filter, M_DEVBUF); 1015 sc->vtnet_vlan_filter = NULL; 1016 } 1017 } 1018 1019 static int 1020 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1021 { 1022 device_t dev; 1023 struct vq_alloc_info *info; 1024 struct vtnet_rxq *rxq; 1025 struct vtnet_txq *txq; 1026 int i, idx, flags, nvqs, error; 1027 1028 dev = sc->vtnet_dev; 1029 flags = 0; 1030 1031 nvqs = sc->vtnet_max_vq_pairs * 2; 1032 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1033 nvqs++; 1034 1035 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1036 if (info == NULL) 1037 return (ENOMEM); 1038 1039 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1040 rxq = &sc->vtnet_rxqs[i]; 1041 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1042 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1043 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1044 1045 txq = &sc->vtnet_txqs[i]; 1046 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1047 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1048 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1049 } 1050 1051 /* These queues will not be used so allocate the minimum resources. */ 1052 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1053 rxq = &sc->vtnet_rxqs[i]; 1054 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1055 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1056 1057 txq = &sc->vtnet_txqs[i]; 1058 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1059 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1060 } 1061 1062 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1063 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1064 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1065 } 1066 1067 /* 1068 * TODO: Enable interrupt binding if this is multiqueue. This will 1069 * only matter when per-virtqueue MSIX is available. 1070 */ 1071 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1072 flags |= 0; 1073 1074 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1075 free(info, M_TEMP); 1076 1077 return (error); 1078 } 1079 1080 static int 1081 vtnet_alloc_interface(struct vtnet_softc *sc) 1082 { 1083 device_t dev; 1084 struct ifnet *ifp; 1085 1086 dev = sc->vtnet_dev; 1087 1088 ifp = if_alloc(IFT_ETHER); 1089 if (ifp == NULL) 1090 return (ENOMEM); 1091 1092 sc->vtnet_ifp = ifp; 1093 ifp->if_softc = sc; 1094 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1095 1096 return (0); 1097 } 1098 1099 static int 1100 vtnet_setup_interface(struct vtnet_softc *sc) 1101 { 1102 device_t dev; 1103 struct pfil_head_args pa; 1104 struct ifnet *ifp; 1105 1106 dev = sc->vtnet_dev; 1107 ifp = sc->vtnet_ifp; 1108 1109 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST | 1110 IFF_KNOWSEPOCH; 1111 ifp->if_baudrate = IF_Gbps(10); 1112 ifp->if_init = vtnet_init; 1113 ifp->if_ioctl = vtnet_ioctl; 1114 ifp->if_get_counter = vtnet_get_counter; 1115 #ifndef VTNET_LEGACY_TX 1116 ifp->if_transmit = vtnet_txq_mq_start; 1117 ifp->if_qflush = vtnet_qflush; 1118 #else 1119 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1120 ifp->if_start = vtnet_start; 1121 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1); 1122 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1; 1123 IFQ_SET_READY(&ifp->if_snd); 1124 #endif 1125 1126 vtnet_get_macaddr(sc); 1127 1128 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1129 ifp->if_capabilities |= IFCAP_LINKSTATE; 1130 1131 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1132 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1133 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1134 1135 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1136 int gso; 1137 1138 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6; 1139 1140 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1141 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1142 ifp->if_capabilities |= IFCAP_TSO4; 1143 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1144 ifp->if_capabilities |= IFCAP_TSO6; 1145 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1146 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1147 1148 if (ifp->if_capabilities & (IFCAP_TSO4 | IFCAP_TSO6)) { 1149 int tso_maxlen; 1150 1151 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 1152 1153 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1154 vtnet_tso_maxlen); 1155 ifp->if_hw_tsomax = tso_maxlen - 1156 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN); 1157 ifp->if_hw_tsomaxsegcount = sc->vtnet_tx_nsegs - 1; 1158 ifp->if_hw_tsomaxsegsize = PAGE_SIZE; 1159 } 1160 } 1161 1162 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1163 ifp->if_capabilities |= IFCAP_RXCSUM; 1164 #ifdef notyet 1165 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1166 ifp->if_capabilities |= IFCAP_RXCSUM_IPV6; 1167 #endif 1168 1169 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1170 vtnet_fixup_needs_csum) != 0) 1171 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1172 1173 /* Support either "hardware" or software LRO. */ 1174 ifp->if_capabilities |= IFCAP_LRO; 1175 } 1176 1177 if (ifp->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1178 /* 1179 * VirtIO does not support VLAN tagging, but we can fake 1180 * it by inserting and removing the 802.1Q header during 1181 * transmit and receive. We are then able to do checksum 1182 * offloading of VLAN frames. 1183 */ 1184 ifp->if_capabilities |= 1185 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 1186 } 1187 1188 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1189 ifp->if_capabilities |= IFCAP_JUMBO_MTU; 1190 ifp->if_capabilities |= IFCAP_VLAN_MTU; 1191 1192 /* 1193 * Capabilities after here are not enabled by default. 1194 */ 1195 ifp->if_capenable = ifp->if_capabilities; 1196 1197 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1198 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 1199 1200 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1201 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1202 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1203 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1204 } 1205 1206 ether_ifattach(ifp, sc->vtnet_hwaddr); 1207 1208 /* Tell the upper layer(s) we support long frames. */ 1209 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 1210 1211 DEBUGNET_SET(ifp, vtnet); 1212 1213 pa.pa_version = PFIL_VERSION; 1214 pa.pa_flags = PFIL_IN; 1215 pa.pa_type = PFIL_TYPE_ETHERNET; 1216 pa.pa_headname = ifp->if_xname; 1217 sc->vtnet_pfil = pfil_head_register(&pa); 1218 1219 return (0); 1220 } 1221 1222 static int 1223 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1224 { 1225 int framesz; 1226 1227 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1228 return (MJUMPAGESIZE); 1229 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1230 return (MCLBYTES); 1231 1232 /* 1233 * Try to scale the receive mbuf cluster size from the MTU. We 1234 * could also use the VQ size to influence the selected size, 1235 * but that would only matter for very small queues. 1236 */ 1237 if (vtnet_modern(sc)) { 1238 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1239 framesz = sizeof(struct virtio_net_hdr_v1); 1240 } else 1241 framesz = sizeof(struct vtnet_rx_header); 1242 framesz += sizeof(struct ether_vlan_header) + mtu; 1243 1244 if (framesz <= MCLBYTES) 1245 return (MCLBYTES); 1246 else if (framesz <= MJUMPAGESIZE) 1247 return (MJUMPAGESIZE); 1248 else if (framesz <= MJUM9BYTES) 1249 return (MJUM9BYTES); 1250 1251 /* Sane default; avoid 16KB clusters. */ 1252 return (MCLBYTES); 1253 } 1254 1255 static int 1256 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1257 { 1258 struct ifnet *ifp; 1259 int clustersz; 1260 1261 ifp = sc->vtnet_ifp; 1262 VTNET_CORE_LOCK_ASSERT(sc); 1263 1264 if (ifp->if_mtu == mtu) 1265 return (0); 1266 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1267 return (EINVAL); 1268 1269 ifp->if_mtu = mtu; 1270 clustersz = vtnet_rx_cluster_size(sc, mtu); 1271 1272 if (clustersz != sc->vtnet_rx_clustersz && 1273 ifp->if_drv_flags & IFF_DRV_RUNNING) { 1274 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1275 vtnet_init_locked(sc, 0); 1276 } 1277 1278 return (0); 1279 } 1280 1281 static int 1282 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1283 { 1284 struct ifnet *ifp; 1285 int drv_running; 1286 1287 ifp = sc->vtnet_ifp; 1288 drv_running = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0; 1289 1290 VTNET_CORE_LOCK_ASSERT(sc); 1291 1292 if ((ifp->if_flags & IFF_UP) == 0) { 1293 if (drv_running) 1294 vtnet_stop(sc); 1295 goto out; 1296 } 1297 1298 if (!drv_running) { 1299 vtnet_init_locked(sc, 0); 1300 goto out; 1301 } 1302 1303 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 1304 (IFF_PROMISC | IFF_ALLMULTI)) { 1305 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 1306 return (ENOTSUP); 1307 vtnet_rx_filter(sc); 1308 } 1309 1310 out: 1311 sc->vtnet_if_flags = ifp->if_flags; 1312 return (0); 1313 } 1314 1315 static int 1316 vtnet_ioctl_multi(struct vtnet_softc *sc) 1317 { 1318 struct ifnet *ifp; 1319 1320 ifp = sc->vtnet_ifp; 1321 1322 VTNET_CORE_LOCK_ASSERT(sc); 1323 1324 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1325 ifp->if_drv_flags & IFF_DRV_RUNNING) 1326 vtnet_rx_filter_mac(sc); 1327 1328 return (0); 1329 } 1330 1331 static int 1332 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1333 { 1334 struct ifnet *ifp; 1335 int mask, reinit, update; 1336 1337 ifp = sc->vtnet_ifp; 1338 mask = (ifr->ifr_reqcap & ifp->if_capabilities) ^ ifp->if_capenable; 1339 reinit = update = 0; 1340 1341 VTNET_CORE_LOCK_ASSERT(sc); 1342 1343 if (mask & IFCAP_TXCSUM) 1344 ifp->if_capenable ^= IFCAP_TXCSUM; 1345 if (mask & IFCAP_TXCSUM_IPV6) 1346 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1347 if (mask & IFCAP_TSO4) 1348 ifp->if_capenable ^= IFCAP_TSO4; 1349 if (mask & IFCAP_TSO6) 1350 ifp->if_capenable ^= IFCAP_TSO6; 1351 1352 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1353 /* 1354 * These Rx features require the negotiated features to 1355 * be updated. Avoid a full reinit if possible. 1356 */ 1357 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1358 update = 1; 1359 else 1360 reinit = 1; 1361 1362 /* BMV: Avoid needless renegotiation for just software LRO. */ 1363 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1364 IFCAP_LRO && vtnet_software_lro(sc)) 1365 reinit = update = 0; 1366 1367 if (mask & IFCAP_RXCSUM) 1368 ifp->if_capenable ^= IFCAP_RXCSUM; 1369 if (mask & IFCAP_RXCSUM_IPV6) 1370 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1371 if (mask & IFCAP_LRO) 1372 ifp->if_capenable ^= IFCAP_LRO; 1373 1374 /* 1375 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1376 * so treat them as a pair. Guest TSO (LRO) requires receive 1377 * checksums. 1378 */ 1379 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1380 ifp->if_capenable |= IFCAP_RXCSUM; 1381 #ifdef notyet 1382 ifp->if_capenable |= IFCAP_RXCSUM_IPV6; 1383 #endif 1384 } else 1385 ifp->if_capenable &= 1386 ~(IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO); 1387 } 1388 1389 if (mask & IFCAP_VLAN_HWFILTER) { 1390 /* These Rx features require renegotiation. */ 1391 reinit = 1; 1392 1393 if (mask & IFCAP_VLAN_HWFILTER) 1394 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1395 } 1396 1397 if (mask & IFCAP_VLAN_HWTSO) 1398 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1399 if (mask & IFCAP_VLAN_HWTAGGING) 1400 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1401 1402 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1403 if (reinit) { 1404 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1405 vtnet_init_locked(sc, 0); 1406 } else if (update) 1407 vtnet_update_rx_offloads(sc); 1408 } 1409 1410 return (0); 1411 } 1412 1413 static int 1414 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1415 { 1416 struct vtnet_softc *sc; 1417 struct ifreq *ifr; 1418 int error; 1419 1420 sc = ifp->if_softc; 1421 ifr = (struct ifreq *) data; 1422 error = 0; 1423 1424 switch (cmd) { 1425 case SIOCSIFMTU: 1426 VTNET_CORE_LOCK(sc); 1427 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1428 VTNET_CORE_UNLOCK(sc); 1429 break; 1430 1431 case SIOCSIFFLAGS: 1432 VTNET_CORE_LOCK(sc); 1433 error = vtnet_ioctl_ifflags(sc); 1434 VTNET_CORE_UNLOCK(sc); 1435 break; 1436 1437 case SIOCADDMULTI: 1438 case SIOCDELMULTI: 1439 VTNET_CORE_LOCK(sc); 1440 error = vtnet_ioctl_multi(sc); 1441 VTNET_CORE_UNLOCK(sc); 1442 break; 1443 1444 case SIOCSIFMEDIA: 1445 case SIOCGIFMEDIA: 1446 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1447 break; 1448 1449 case SIOCSIFCAP: 1450 VTNET_CORE_LOCK(sc); 1451 error = vtnet_ioctl_ifcap(sc, ifr); 1452 VTNET_CORE_UNLOCK(sc); 1453 VLAN_CAPABILITIES(ifp); 1454 break; 1455 1456 default: 1457 error = ether_ioctl(ifp, cmd, data); 1458 break; 1459 } 1460 1461 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1462 1463 return (error); 1464 } 1465 1466 static int 1467 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1468 { 1469 struct virtqueue *vq; 1470 int nbufs, error; 1471 1472 #ifdef DEV_NETMAP 1473 error = vtnet_netmap_rxq_populate(rxq); 1474 if (error >= 0) 1475 return (error); 1476 #endif /* DEV_NETMAP */ 1477 1478 vq = rxq->vtnrx_vq; 1479 error = ENOSPC; 1480 1481 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1482 error = vtnet_rxq_new_buf(rxq); 1483 if (error) 1484 break; 1485 } 1486 1487 if (nbufs > 0) { 1488 virtqueue_notify(vq); 1489 /* 1490 * EMSGSIZE signifies the virtqueue did not have enough 1491 * entries available to hold the last mbuf. This is not 1492 * an error. 1493 */ 1494 if (error == EMSGSIZE) 1495 error = 0; 1496 } 1497 1498 return (error); 1499 } 1500 1501 static void 1502 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1503 { 1504 struct virtqueue *vq; 1505 struct mbuf *m; 1506 int last; 1507 #ifdef DEV_NETMAP 1508 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1509 rxq->vtnrx_id, NR_RX); 1510 #else /* !DEV_NETMAP */ 1511 void *kring = NULL; 1512 #endif /* !DEV_NETMAP */ 1513 1514 vq = rxq->vtnrx_vq; 1515 last = 0; 1516 1517 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1518 if (kring == NULL) 1519 m_freem(m); 1520 } 1521 1522 KASSERT(virtqueue_empty(vq), 1523 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1524 } 1525 1526 static struct mbuf * 1527 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1528 { 1529 struct mbuf *m_head, *m_tail, *m; 1530 int i, size; 1531 1532 m_head = NULL; 1533 size = sc->vtnet_rx_clustersz; 1534 1535 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1536 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1537 1538 for (i = 0; i < nbufs; i++) { 1539 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1540 if (m == NULL) { 1541 sc->vtnet_stats.mbuf_alloc_failed++; 1542 m_freem(m_head); 1543 return (NULL); 1544 } 1545 1546 m->m_len = size; 1547 if (m_head != NULL) { 1548 m_tail->m_next = m; 1549 m_tail = m; 1550 } else 1551 m_head = m_tail = m; 1552 } 1553 1554 if (m_tailp != NULL) 1555 *m_tailp = m_tail; 1556 1557 return (m_head); 1558 } 1559 1560 /* 1561 * Slow path for when LRO without mergeable buffers is negotiated. 1562 */ 1563 static int 1564 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1565 int len0) 1566 { 1567 struct vtnet_softc *sc; 1568 struct mbuf *m, *m_prev, *m_new, *m_tail; 1569 int len, clustersz, nreplace, error; 1570 1571 sc = rxq->vtnrx_sc; 1572 clustersz = sc->vtnet_rx_clustersz; 1573 1574 m_prev = NULL; 1575 m_tail = NULL; 1576 nreplace = 0; 1577 1578 m = m0; 1579 len = len0; 1580 1581 /* 1582 * Since these mbuf chains are so large, avoid allocating a complete 1583 * replacement when the received frame did not consume the entire 1584 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1585 */ 1586 while (len > 0) { 1587 if (m == NULL) { 1588 sc->vtnet_stats.rx_frame_too_large++; 1589 return (EMSGSIZE); 1590 } 1591 1592 /* 1593 * Every mbuf should have the expected cluster size since that 1594 * is also used to allocate the replacements. 1595 */ 1596 KASSERT(m->m_len == clustersz, 1597 ("%s: mbuf size %d not expected cluster size %d", __func__, 1598 m->m_len, clustersz)); 1599 1600 m->m_len = MIN(m->m_len, len); 1601 len -= m->m_len; 1602 1603 m_prev = m; 1604 m = m->m_next; 1605 nreplace++; 1606 } 1607 1608 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1609 ("%s: invalid replacement mbuf count %d max %d", __func__, 1610 nreplace, sc->vtnet_rx_nmbufs)); 1611 1612 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1613 if (m_new == NULL) { 1614 m_prev->m_len = clustersz; 1615 return (ENOBUFS); 1616 } 1617 1618 /* 1619 * Move any unused mbufs from the received mbuf chain onto the 1620 * end of the replacement chain. 1621 */ 1622 if (m_prev->m_next != NULL) { 1623 m_tail->m_next = m_prev->m_next; 1624 m_prev->m_next = NULL; 1625 } 1626 1627 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1628 if (error) { 1629 /* 1630 * The replacement is suppose to be an copy of the one 1631 * dequeued so this is a very unexpected error. 1632 * 1633 * Restore the m0 chain to the original state if it was 1634 * modified so we can then discard it. 1635 */ 1636 if (m_tail->m_next != NULL) { 1637 m_prev->m_next = m_tail->m_next; 1638 m_tail->m_next = NULL; 1639 } 1640 m_prev->m_len = clustersz; 1641 sc->vtnet_stats.rx_enq_replacement_failed++; 1642 m_freem(m_new); 1643 } 1644 1645 return (error); 1646 } 1647 1648 static int 1649 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1650 { 1651 struct vtnet_softc *sc; 1652 struct mbuf *m_new; 1653 int error; 1654 1655 sc = rxq->vtnrx_sc; 1656 1657 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1658 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1659 1660 MPASS(m->m_next == NULL); 1661 if (m->m_len < len) 1662 return (EMSGSIZE); 1663 1664 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1665 if (m_new == NULL) 1666 return (ENOBUFS); 1667 1668 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1669 if (error) { 1670 sc->vtnet_stats.rx_enq_replacement_failed++; 1671 m_freem(m_new); 1672 } else 1673 m->m_len = len; 1674 1675 return (error); 1676 } 1677 1678 static int 1679 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1680 { 1681 struct vtnet_softc *sc; 1682 struct sglist *sg; 1683 int header_inlined, error; 1684 1685 sc = rxq->vtnrx_sc; 1686 sg = rxq->vtnrx_sg; 1687 1688 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1689 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1690 VTNET_RXQ_LOCK_ASSERT(rxq); 1691 1692 sglist_reset(sg); 1693 header_inlined = vtnet_modern(sc) || 1694 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1695 1696 if (header_inlined) 1697 error = sglist_append_mbuf(sg, m); 1698 else { 1699 struct vtnet_rx_header *rxhdr = 1700 mtod(m, struct vtnet_rx_header *); 1701 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1702 1703 /* Append the header and remaining mbuf data. */ 1704 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1705 if (error) 1706 return (error); 1707 error = sglist_append(sg, &rxhdr[1], 1708 m->m_len - sizeof(struct vtnet_rx_header)); 1709 if (error) 1710 return (error); 1711 1712 if (m->m_next != NULL) 1713 error = sglist_append_mbuf(sg, m->m_next); 1714 } 1715 1716 if (error) 1717 return (error); 1718 1719 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1720 } 1721 1722 static int 1723 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1724 { 1725 struct vtnet_softc *sc; 1726 struct mbuf *m; 1727 int error; 1728 1729 sc = rxq->vtnrx_sc; 1730 1731 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1732 if (m == NULL) 1733 return (ENOBUFS); 1734 1735 error = vtnet_rxq_enqueue_buf(rxq, m); 1736 if (error) 1737 m_freem(m); 1738 1739 return (error); 1740 } 1741 1742 static int 1743 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1744 int hoff, struct virtio_net_hdr *hdr) 1745 { 1746 struct vtnet_softc *sc; 1747 int error; 1748 1749 sc = rxq->vtnrx_sc; 1750 1751 /* 1752 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1753 * not have an analogous CSUM flag. The checksum has been validated, 1754 * but is incomplete (TCP/UDP pseudo header). 1755 * 1756 * The packet is likely from another VM on the same host that itself 1757 * performed checksum offloading so Tx/Rx is basically a memcpy and 1758 * the checksum has little value. 1759 * 1760 * Default to receiving the packet as-is for performance reasons, but 1761 * this can cause issues if the packet is to be forwarded because it 1762 * does not contain a valid checksum. This patch may be helpful: 1763 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1764 * compute the checksum if requested. 1765 * 1766 * BMV: Need to add an CSUM_PARTIAL flag? 1767 */ 1768 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1769 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1770 return (error); 1771 } 1772 1773 /* 1774 * Compute the checksum in the driver so the packet will contain a 1775 * valid checksum. The checksum is at csum_offset from csum_start. 1776 */ 1777 switch (etype) { 1778 #if defined(INET) || defined(INET6) 1779 case ETHERTYPE_IP: 1780 case ETHERTYPE_IPV6: { 1781 int csum_off, csum_end; 1782 uint16_t csum; 1783 1784 csum_off = hdr->csum_start + hdr->csum_offset; 1785 csum_end = csum_off + sizeof(uint16_t); 1786 1787 /* Assume checksum will be in the first mbuf. */ 1788 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1789 return (1); 1790 1791 /* 1792 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1793 * checksum and write it at the specified offset. We could 1794 * try to verify the packet: csum_start should probably 1795 * correspond to the start of the TCP/UDP header. 1796 * 1797 * BMV: Need to properly handle UDP with zero checksum. Is 1798 * the IPv4 header checksum implicitly validated? 1799 */ 1800 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1801 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1802 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1803 m->m_pkthdr.csum_data = 0xFFFF; 1804 break; 1805 } 1806 #endif 1807 default: 1808 sc->vtnet_stats.rx_csum_bad_ethtype++; 1809 return (1); 1810 } 1811 1812 return (0); 1813 } 1814 1815 static int 1816 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1817 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1818 { 1819 #if 0 1820 struct vtnet_softc *sc; 1821 #endif 1822 int protocol; 1823 1824 #if 0 1825 sc = rxq->vtnrx_sc; 1826 #endif 1827 1828 switch (etype) { 1829 #if defined(INET) 1830 case ETHERTYPE_IP: 1831 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1832 protocol = IPPROTO_DONE; 1833 else { 1834 struct ip *ip = (struct ip *)(m->m_data + hoff); 1835 protocol = ip->ip_p; 1836 } 1837 break; 1838 #endif 1839 #if defined(INET6) 1840 case ETHERTYPE_IPV6: 1841 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1842 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1843 protocol = IPPROTO_DONE; 1844 break; 1845 #endif 1846 default: 1847 protocol = IPPROTO_DONE; 1848 break; 1849 } 1850 1851 switch (protocol) { 1852 case IPPROTO_TCP: 1853 case IPPROTO_UDP: 1854 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1855 m->m_pkthdr.csum_data = 0xFFFF; 1856 break; 1857 default: 1858 /* 1859 * FreeBSD does not support checksum offloading of this 1860 * protocol. Let the stack re-verify the checksum later 1861 * if the protocol is supported. 1862 */ 1863 #if 0 1864 if_printf(sc->vtnet_ifp, 1865 "%s: checksum offload of unsupported protocol " 1866 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1867 __func__, etype, protocol, hdr->csum_start, 1868 hdr->csum_offset); 1869 #endif 1870 break; 1871 } 1872 1873 return (0); 1874 } 1875 1876 static int 1877 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1878 struct virtio_net_hdr *hdr) 1879 { 1880 const struct ether_header *eh; 1881 int hoff; 1882 uint16_t etype; 1883 1884 eh = mtod(m, const struct ether_header *); 1885 etype = ntohs(eh->ether_type); 1886 if (etype == ETHERTYPE_VLAN) { 1887 /* TODO BMV: Handle QinQ. */ 1888 const struct ether_vlan_header *evh = 1889 mtod(m, const struct ether_vlan_header *); 1890 etype = ntohs(evh->evl_proto); 1891 hoff = sizeof(struct ether_vlan_header); 1892 } else 1893 hoff = sizeof(struct ether_header); 1894 1895 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1896 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1897 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1898 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1899 } 1900 1901 static void 1902 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1903 { 1904 struct mbuf *m; 1905 1906 while (--nbufs > 0) { 1907 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1908 if (m == NULL) 1909 break; 1910 vtnet_rxq_discard_buf(rxq, m); 1911 } 1912 } 1913 1914 static void 1915 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1916 { 1917 int error __diagused; 1918 1919 /* 1920 * Requeue the discarded mbuf. This should always be successful 1921 * since it was just dequeued. 1922 */ 1923 error = vtnet_rxq_enqueue_buf(rxq, m); 1924 KASSERT(error == 0, 1925 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1926 } 1927 1928 static int 1929 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1930 { 1931 struct vtnet_softc *sc; 1932 struct virtqueue *vq; 1933 struct mbuf *m_tail; 1934 1935 sc = rxq->vtnrx_sc; 1936 vq = rxq->vtnrx_vq; 1937 m_tail = m_head; 1938 1939 while (--nbufs > 0) { 1940 struct mbuf *m; 1941 uint32_t len; 1942 1943 m = virtqueue_dequeue(vq, &len); 1944 if (m == NULL) { 1945 rxq->vtnrx_stats.vrxs_ierrors++; 1946 goto fail; 1947 } 1948 1949 if (vtnet_rxq_new_buf(rxq) != 0) { 1950 rxq->vtnrx_stats.vrxs_iqdrops++; 1951 vtnet_rxq_discard_buf(rxq, m); 1952 if (nbufs > 1) 1953 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1954 goto fail; 1955 } 1956 1957 if (m->m_len < len) 1958 len = m->m_len; 1959 1960 m->m_len = len; 1961 m->m_flags &= ~M_PKTHDR; 1962 1963 m_head->m_pkthdr.len += len; 1964 m_tail->m_next = m; 1965 m_tail = m; 1966 } 1967 1968 return (0); 1969 1970 fail: 1971 sc->vtnet_stats.rx_mergeable_failed++; 1972 m_freem(m_head); 1973 1974 return (1); 1975 } 1976 1977 #if defined(INET) || defined(INET6) 1978 static int 1979 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1980 { 1981 struct lro_ctrl *lro; 1982 1983 lro = &rxq->vtnrx_lro; 1984 1985 if (lro->lro_mbuf_max != 0) { 1986 tcp_lro_queue_mbuf(lro, m); 1987 return (0); 1988 } 1989 1990 return (tcp_lro_rx(lro, m, 0)); 1991 } 1992 #endif 1993 1994 static void 1995 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1996 struct virtio_net_hdr *hdr) 1997 { 1998 struct vtnet_softc *sc; 1999 struct ifnet *ifp; 2000 2001 sc = rxq->vtnrx_sc; 2002 ifp = sc->vtnet_ifp; 2003 2004 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 2005 struct ether_header *eh = mtod(m, struct ether_header *); 2006 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2007 vtnet_vlan_tag_remove(m); 2008 /* 2009 * With the 802.1Q header removed, update the 2010 * checksum starting location accordingly. 2011 */ 2012 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2013 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2014 } 2015 } 2016 2017 m->m_pkthdr.flowid = rxq->vtnrx_id; 2018 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2019 2020 if (hdr->flags & 2021 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2022 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2023 rxq->vtnrx_stats.vrxs_csum++; 2024 else 2025 rxq->vtnrx_stats.vrxs_csum_failed++; 2026 } 2027 2028 if (hdr->gso_size != 0) { 2029 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2030 case VIRTIO_NET_HDR_GSO_TCPV4: 2031 case VIRTIO_NET_HDR_GSO_TCPV6: 2032 m->m_pkthdr.lro_nsegs = 2033 howmany(m->m_pkthdr.len, hdr->gso_size); 2034 rxq->vtnrx_stats.vrxs_host_lro++; 2035 break; 2036 } 2037 } 2038 2039 rxq->vtnrx_stats.vrxs_ipackets++; 2040 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2041 2042 #if defined(INET) || defined(INET6) 2043 if (vtnet_software_lro(sc) && ifp->if_capenable & IFCAP_LRO) { 2044 if (vtnet_lro_rx(rxq, m) == 0) 2045 return; 2046 } 2047 #endif 2048 2049 (*ifp->if_input)(ifp, m); 2050 } 2051 2052 static int 2053 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2054 { 2055 struct virtio_net_hdr lhdr, *hdr; 2056 struct vtnet_softc *sc; 2057 struct ifnet *ifp; 2058 struct virtqueue *vq; 2059 int deq, count; 2060 2061 sc = rxq->vtnrx_sc; 2062 vq = rxq->vtnrx_vq; 2063 ifp = sc->vtnet_ifp; 2064 deq = 0; 2065 count = sc->vtnet_rx_process_limit; 2066 2067 VTNET_RXQ_LOCK_ASSERT(rxq); 2068 2069 while (count-- > 0) { 2070 struct mbuf *m; 2071 uint32_t len, nbufs, adjsz; 2072 2073 m = virtqueue_dequeue(vq, &len); 2074 if (m == NULL) 2075 break; 2076 deq++; 2077 2078 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2079 rxq->vtnrx_stats.vrxs_ierrors++; 2080 vtnet_rxq_discard_buf(rxq, m); 2081 continue; 2082 } 2083 2084 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2085 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2086 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2087 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2088 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2089 } else if (vtnet_modern(sc)) { 2090 nbufs = 1; /* num_buffers is always 1 */ 2091 adjsz = sizeof(struct virtio_net_hdr_v1); 2092 } else { 2093 nbufs = 1; 2094 adjsz = sizeof(struct vtnet_rx_header); 2095 /* 2096 * Account for our gap between the header and start of 2097 * data to keep the segments separated. 2098 */ 2099 len += VTNET_RX_HEADER_PAD; 2100 } 2101 2102 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2103 rxq->vtnrx_stats.vrxs_iqdrops++; 2104 vtnet_rxq_discard_buf(rxq, m); 2105 if (nbufs > 1) 2106 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2107 continue; 2108 } 2109 2110 m->m_pkthdr.len = len; 2111 m->m_pkthdr.rcvif = ifp; 2112 m->m_pkthdr.csum_flags = 0; 2113 2114 if (nbufs > 1) { 2115 /* Dequeue the rest of chain. */ 2116 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2117 continue; 2118 } 2119 2120 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2121 2122 /* 2123 * Save an endian swapped version of the header prior to it 2124 * being stripped. The header is always at the start of the 2125 * mbuf data. num_buffers was already saved (and not needed) 2126 * so use the standard header. 2127 */ 2128 hdr = mtod(m, struct virtio_net_hdr *); 2129 lhdr.flags = hdr->flags; 2130 lhdr.gso_type = hdr->gso_type; 2131 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2132 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2133 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2134 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2135 m_adj(m, adjsz); 2136 2137 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2138 pfil_return_t pfil; 2139 2140 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 2141 NULL); 2142 switch (pfil) { 2143 case PFIL_REALLOCED: 2144 m = pfil_mem2mbuf(m->m_data); 2145 break; 2146 case PFIL_DROPPED: 2147 case PFIL_CONSUMED: 2148 continue; 2149 default: 2150 KASSERT(pfil == PFIL_PASS, 2151 ("Filter returned %d!", pfil)); 2152 } 2153 } 2154 2155 vtnet_rxq_input(rxq, m, &lhdr); 2156 } 2157 2158 if (deq > 0) { 2159 #if defined(INET) || defined(INET6) 2160 if (vtnet_software_lro(sc)) 2161 tcp_lro_flush_all(&rxq->vtnrx_lro); 2162 #endif 2163 virtqueue_notify(vq); 2164 } 2165 2166 return (count > 0 ? 0 : EAGAIN); 2167 } 2168 2169 static void 2170 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2171 { 2172 struct vtnet_softc *sc; 2173 struct ifnet *ifp; 2174 u_int more; 2175 #ifdef DEV_NETMAP 2176 int nmirq; 2177 #endif /* DEV_NETMAP */ 2178 2179 sc = rxq->vtnrx_sc; 2180 ifp = sc->vtnet_ifp; 2181 2182 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2183 /* 2184 * Ignore this interrupt. Either this is a spurious interrupt 2185 * or multiqueue without per-VQ MSIX so every queue needs to 2186 * be polled (a brain dead configuration we could try harder 2187 * to avoid). 2188 */ 2189 vtnet_rxq_disable_intr(rxq); 2190 return; 2191 } 2192 2193 VTNET_RXQ_LOCK(rxq); 2194 2195 #ifdef DEV_NETMAP 2196 /* 2197 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2198 * This is not necessary to serialize the access to the RX vq, but 2199 * rather to avoid races that may happen if this interface is 2200 * attached to a VALE switch, which would cause received packets 2201 * to stall in the RX queue (nm_kr_tryget() could find the kring 2202 * busy when called from netmap_bwrap_intr_notify()). 2203 */ 2204 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2205 if (nmirq != NM_IRQ_PASS) { 2206 VTNET_RXQ_UNLOCK(rxq); 2207 if (nmirq == NM_IRQ_RESCHED) { 2208 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2209 } 2210 return; 2211 } 2212 #endif /* DEV_NETMAP */ 2213 2214 again: 2215 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2216 VTNET_RXQ_UNLOCK(rxq); 2217 return; 2218 } 2219 2220 more = vtnet_rxq_eof(rxq); 2221 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2222 if (!more) 2223 vtnet_rxq_disable_intr(rxq); 2224 /* 2225 * This is an occasional condition or race (when !more), 2226 * so retry a few times before scheduling the taskqueue. 2227 */ 2228 if (tries-- > 0) 2229 goto again; 2230 2231 rxq->vtnrx_stats.vrxs_rescheduled++; 2232 VTNET_RXQ_UNLOCK(rxq); 2233 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2234 } else 2235 VTNET_RXQ_UNLOCK(rxq); 2236 } 2237 2238 static void 2239 vtnet_rx_vq_intr(void *xrxq) 2240 { 2241 struct vtnet_rxq *rxq; 2242 2243 rxq = xrxq; 2244 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2245 } 2246 2247 static void 2248 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2249 { 2250 struct vtnet_rxq *rxq; 2251 2252 rxq = xrxq; 2253 vtnet_rx_vq_process(rxq, 0); 2254 } 2255 2256 static int 2257 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2258 { 2259 struct vtnet_softc *sc; 2260 int threshold; 2261 2262 sc = txq->vtntx_sc; 2263 2264 /* 2265 * The Tx interrupt is disabled until the queue free count falls 2266 * below our threshold. Completed frames are drained from the Tx 2267 * virtqueue before transmitting new frames and in the watchdog 2268 * callout, so the frequency of Tx interrupts is greatly reduced, 2269 * at the cost of not freeing mbufs as quickly as they otherwise 2270 * would be. 2271 */ 2272 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2273 2274 /* 2275 * Without indirect descriptors, leave enough room for the most 2276 * segments we handle. 2277 */ 2278 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2279 threshold < sc->vtnet_tx_nsegs) 2280 threshold = sc->vtnet_tx_nsegs; 2281 2282 return (threshold); 2283 } 2284 2285 static int 2286 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2287 { 2288 struct virtqueue *vq; 2289 2290 vq = txq->vtntx_vq; 2291 2292 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2293 } 2294 2295 static int 2296 vtnet_txq_notify(struct vtnet_txq *txq) 2297 { 2298 struct virtqueue *vq; 2299 2300 vq = txq->vtntx_vq; 2301 2302 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2303 virtqueue_notify(vq); 2304 2305 if (vtnet_txq_enable_intr(txq) == 0) 2306 return (0); 2307 2308 /* 2309 * Drain frames that were completed since last checked. If this 2310 * causes the queue to go above the threshold, the caller should 2311 * continue transmitting. 2312 */ 2313 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2314 virtqueue_disable_intr(vq); 2315 return (1); 2316 } 2317 2318 return (0); 2319 } 2320 2321 static void 2322 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2323 { 2324 struct virtqueue *vq; 2325 struct vtnet_tx_header *txhdr; 2326 int last; 2327 #ifdef DEV_NETMAP 2328 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2329 txq->vtntx_id, NR_TX); 2330 #else /* !DEV_NETMAP */ 2331 void *kring = NULL; 2332 #endif /* !DEV_NETMAP */ 2333 2334 vq = txq->vtntx_vq; 2335 last = 0; 2336 2337 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2338 if (kring == NULL) { 2339 m_freem(txhdr->vth_mbuf); 2340 uma_zfree(vtnet_tx_header_zone, txhdr); 2341 } 2342 } 2343 2344 KASSERT(virtqueue_empty(vq), 2345 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2346 } 2347 2348 /* 2349 * BMV: This can go away once we finally have offsets in the mbuf header. 2350 */ 2351 static int 2352 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2353 int *proto, int *start) 2354 { 2355 struct vtnet_softc *sc; 2356 struct ether_vlan_header *evh; 2357 int offset; 2358 2359 sc = txq->vtntx_sc; 2360 2361 evh = mtod(m, struct ether_vlan_header *); 2362 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2363 /* BMV: We should handle nested VLAN tags too. */ 2364 *etype = ntohs(evh->evl_proto); 2365 offset = sizeof(struct ether_vlan_header); 2366 } else { 2367 *etype = ntohs(evh->evl_encap_proto); 2368 offset = sizeof(struct ether_header); 2369 } 2370 2371 switch (*etype) { 2372 #if defined(INET) 2373 case ETHERTYPE_IP: { 2374 struct ip *ip, iphdr; 2375 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2376 m_copydata(m, offset, sizeof(struct ip), 2377 (caddr_t) &iphdr); 2378 ip = &iphdr; 2379 } else 2380 ip = (struct ip *)(m->m_data + offset); 2381 *proto = ip->ip_p; 2382 *start = offset + (ip->ip_hl << 2); 2383 break; 2384 } 2385 #endif 2386 #if defined(INET6) 2387 case ETHERTYPE_IPV6: 2388 *proto = -1; 2389 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2390 /* Assert the network stack sent us a valid packet. */ 2391 KASSERT(*start > offset, 2392 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2393 *start, offset, *proto)); 2394 break; 2395 #endif 2396 default: 2397 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2398 return (EINVAL); 2399 } 2400 2401 return (0); 2402 } 2403 2404 static int 2405 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2406 int offset, struct virtio_net_hdr *hdr) 2407 { 2408 static struct timeval lastecn; 2409 static int curecn; 2410 struct vtnet_softc *sc; 2411 struct tcphdr *tcp, tcphdr; 2412 2413 sc = txq->vtntx_sc; 2414 2415 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2416 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2417 tcp = &tcphdr; 2418 } else 2419 tcp = (struct tcphdr *)(m->m_data + offset); 2420 2421 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2422 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2423 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2424 VIRTIO_NET_HDR_GSO_TCPV6; 2425 2426 if (__predict_false(tcp->th_flags & TH_CWR)) { 2427 /* 2428 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2429 * FreeBSD, ECN support is not on a per-interface basis, 2430 * but globally via the net.inet.tcp.ecn.enable sysctl 2431 * knob. The default is off. 2432 */ 2433 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2434 if (ppsratecheck(&lastecn, &curecn, 1)) 2435 if_printf(sc->vtnet_ifp, 2436 "TSO with ECN not negotiated with host\n"); 2437 return (ENOTSUP); 2438 } 2439 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2440 } 2441 2442 txq->vtntx_stats.vtxs_tso++; 2443 2444 return (0); 2445 } 2446 2447 static struct mbuf * 2448 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2449 struct virtio_net_hdr *hdr) 2450 { 2451 struct vtnet_softc *sc; 2452 int flags, etype, csum_start, proto, error; 2453 2454 sc = txq->vtntx_sc; 2455 flags = m->m_pkthdr.csum_flags; 2456 2457 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2458 if (error) 2459 goto drop; 2460 2461 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2462 /* Sanity check the parsed mbuf matches the offload flags. */ 2463 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2464 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2465 && etype != ETHERTYPE_IPV6))) { 2466 sc->vtnet_stats.tx_csum_proto_mismatch++; 2467 goto drop; 2468 } 2469 2470 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2471 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2472 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2473 txq->vtntx_stats.vtxs_csum++; 2474 } 2475 2476 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2477 /* 2478 * Sanity check the parsed mbuf IP protocol is TCP, and 2479 * VirtIO TSO reqires the checksum offloading above. 2480 */ 2481 if (__predict_false(proto != IPPROTO_TCP)) { 2482 sc->vtnet_stats.tx_tso_not_tcp++; 2483 goto drop; 2484 } else if (__predict_false((hdr->flags & 2485 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2486 sc->vtnet_stats.tx_tso_without_csum++; 2487 goto drop; 2488 } 2489 2490 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2491 if (error) 2492 goto drop; 2493 } 2494 2495 return (m); 2496 2497 drop: 2498 m_freem(m); 2499 return (NULL); 2500 } 2501 2502 static int 2503 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2504 struct vtnet_tx_header *txhdr) 2505 { 2506 struct vtnet_softc *sc; 2507 struct virtqueue *vq; 2508 struct sglist *sg; 2509 struct mbuf *m; 2510 int error; 2511 2512 sc = txq->vtntx_sc; 2513 vq = txq->vtntx_vq; 2514 sg = txq->vtntx_sg; 2515 m = *m_head; 2516 2517 sglist_reset(sg); 2518 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2519 if (error != 0 || sg->sg_nseg != 1) { 2520 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2521 __func__, error, sg->sg_nseg)); 2522 goto fail; 2523 } 2524 2525 error = sglist_append_mbuf(sg, m); 2526 if (error) { 2527 m = m_defrag(m, M_NOWAIT); 2528 if (m == NULL) 2529 goto fail; 2530 2531 *m_head = m; 2532 sc->vtnet_stats.tx_defragged++; 2533 2534 error = sglist_append_mbuf(sg, m); 2535 if (error) 2536 goto fail; 2537 } 2538 2539 txhdr->vth_mbuf = m; 2540 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2541 2542 return (error); 2543 2544 fail: 2545 sc->vtnet_stats.tx_defrag_failed++; 2546 m_freem(*m_head); 2547 *m_head = NULL; 2548 2549 return (ENOBUFS); 2550 } 2551 2552 static int 2553 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2554 { 2555 struct vtnet_tx_header *txhdr; 2556 struct virtio_net_hdr *hdr; 2557 struct mbuf *m; 2558 int error; 2559 2560 m = *m_head; 2561 M_ASSERTPKTHDR(m); 2562 2563 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2564 if (txhdr == NULL) { 2565 m_freem(m); 2566 *m_head = NULL; 2567 return (ENOMEM); 2568 } 2569 2570 /* 2571 * Always use the non-mergeable header, regardless if mergable headers 2572 * were negotiated, because for transmit num_buffers is always zero. 2573 * The vtnet_hdr_size is used to enqueue the right header size segment. 2574 */ 2575 hdr = &txhdr->vth_uhdr.hdr; 2576 2577 if (m->m_flags & M_VLANTAG) { 2578 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2579 if ((*m_head = m) == NULL) { 2580 error = ENOBUFS; 2581 goto fail; 2582 } 2583 m->m_flags &= ~M_VLANTAG; 2584 } 2585 2586 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2587 m = vtnet_txq_offload(txq, m, hdr); 2588 if ((*m_head = m) == NULL) { 2589 error = ENOBUFS; 2590 goto fail; 2591 } 2592 } 2593 2594 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2595 fail: 2596 if (error) 2597 uma_zfree(vtnet_tx_header_zone, txhdr); 2598 2599 return (error); 2600 } 2601 2602 #ifdef VTNET_LEGACY_TX 2603 2604 static void 2605 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2606 { 2607 struct vtnet_softc *sc; 2608 struct virtqueue *vq; 2609 struct mbuf *m0; 2610 int tries, enq; 2611 2612 sc = txq->vtntx_sc; 2613 vq = txq->vtntx_vq; 2614 tries = 0; 2615 2616 VTNET_TXQ_LOCK_ASSERT(txq); 2617 2618 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2619 sc->vtnet_link_active == 0) 2620 return; 2621 2622 vtnet_txq_eof(txq); 2623 2624 again: 2625 enq = 0; 2626 2627 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2628 if (virtqueue_full(vq)) 2629 break; 2630 2631 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2632 if (m0 == NULL) 2633 break; 2634 2635 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2636 if (m0 != NULL) 2637 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2638 break; 2639 } 2640 2641 enq++; 2642 ETHER_BPF_MTAP(ifp, m0); 2643 } 2644 2645 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2646 if (tries++ < VTNET_NOTIFY_RETRIES) 2647 goto again; 2648 2649 txq->vtntx_stats.vtxs_rescheduled++; 2650 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2651 } 2652 } 2653 2654 static void 2655 vtnet_start(struct ifnet *ifp) 2656 { 2657 struct vtnet_softc *sc; 2658 struct vtnet_txq *txq; 2659 2660 sc = ifp->if_softc; 2661 txq = &sc->vtnet_txqs[0]; 2662 2663 VTNET_TXQ_LOCK(txq); 2664 vtnet_start_locked(txq, ifp); 2665 VTNET_TXQ_UNLOCK(txq); 2666 } 2667 2668 #else /* !VTNET_LEGACY_TX */ 2669 2670 static int 2671 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2672 { 2673 struct vtnet_softc *sc; 2674 struct virtqueue *vq; 2675 struct buf_ring *br; 2676 struct ifnet *ifp; 2677 int enq, tries, error; 2678 2679 sc = txq->vtntx_sc; 2680 vq = txq->vtntx_vq; 2681 br = txq->vtntx_br; 2682 ifp = sc->vtnet_ifp; 2683 tries = 0; 2684 error = 0; 2685 2686 VTNET_TXQ_LOCK_ASSERT(txq); 2687 2688 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2689 sc->vtnet_link_active == 0) { 2690 if (m != NULL) 2691 error = drbr_enqueue(ifp, br, m); 2692 return (error); 2693 } 2694 2695 if (m != NULL) { 2696 error = drbr_enqueue(ifp, br, m); 2697 if (error) 2698 return (error); 2699 } 2700 2701 vtnet_txq_eof(txq); 2702 2703 again: 2704 enq = 0; 2705 2706 while ((m = drbr_peek(ifp, br)) != NULL) { 2707 if (virtqueue_full(vq)) { 2708 drbr_putback(ifp, br, m); 2709 break; 2710 } 2711 2712 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2713 if (m != NULL) 2714 drbr_putback(ifp, br, m); 2715 else 2716 drbr_advance(ifp, br); 2717 break; 2718 } 2719 drbr_advance(ifp, br); 2720 2721 enq++; 2722 ETHER_BPF_MTAP(ifp, m); 2723 } 2724 2725 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2726 if (tries++ < VTNET_NOTIFY_RETRIES) 2727 goto again; 2728 2729 txq->vtntx_stats.vtxs_rescheduled++; 2730 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2731 } 2732 2733 return (0); 2734 } 2735 2736 static int 2737 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2738 { 2739 struct vtnet_softc *sc; 2740 struct vtnet_txq *txq; 2741 int i, npairs, error; 2742 2743 sc = ifp->if_softc; 2744 npairs = sc->vtnet_act_vq_pairs; 2745 2746 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2747 i = m->m_pkthdr.flowid % npairs; 2748 else 2749 i = curcpu % npairs; 2750 2751 txq = &sc->vtnet_txqs[i]; 2752 2753 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2754 error = vtnet_txq_mq_start_locked(txq, m); 2755 VTNET_TXQ_UNLOCK(txq); 2756 } else { 2757 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2758 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2759 } 2760 2761 return (error); 2762 } 2763 2764 static void 2765 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2766 { 2767 struct vtnet_softc *sc; 2768 struct vtnet_txq *txq; 2769 2770 txq = xtxq; 2771 sc = txq->vtntx_sc; 2772 2773 VTNET_TXQ_LOCK(txq); 2774 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2775 vtnet_txq_mq_start_locked(txq, NULL); 2776 VTNET_TXQ_UNLOCK(txq); 2777 } 2778 2779 #endif /* VTNET_LEGACY_TX */ 2780 2781 static void 2782 vtnet_txq_start(struct vtnet_txq *txq) 2783 { 2784 struct vtnet_softc *sc; 2785 struct ifnet *ifp; 2786 2787 sc = txq->vtntx_sc; 2788 ifp = sc->vtnet_ifp; 2789 2790 #ifdef VTNET_LEGACY_TX 2791 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2792 vtnet_start_locked(txq, ifp); 2793 #else 2794 if (!drbr_empty(ifp, txq->vtntx_br)) 2795 vtnet_txq_mq_start_locked(txq, NULL); 2796 #endif 2797 } 2798 2799 static void 2800 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2801 { 2802 struct vtnet_softc *sc; 2803 struct vtnet_txq *txq; 2804 struct ifnet *ifp; 2805 2806 txq = xtxq; 2807 sc = txq->vtntx_sc; 2808 ifp = sc->vtnet_ifp; 2809 2810 VTNET_TXQ_LOCK(txq); 2811 2812 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2813 VTNET_TXQ_UNLOCK(txq); 2814 return; 2815 } 2816 2817 vtnet_txq_eof(txq); 2818 vtnet_txq_start(txq); 2819 2820 VTNET_TXQ_UNLOCK(txq); 2821 } 2822 2823 static int 2824 vtnet_txq_eof(struct vtnet_txq *txq) 2825 { 2826 struct virtqueue *vq; 2827 struct vtnet_tx_header *txhdr; 2828 struct mbuf *m; 2829 int deq; 2830 2831 vq = txq->vtntx_vq; 2832 deq = 0; 2833 VTNET_TXQ_LOCK_ASSERT(txq); 2834 2835 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2836 m = txhdr->vth_mbuf; 2837 deq++; 2838 2839 txq->vtntx_stats.vtxs_opackets++; 2840 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2841 if (m->m_flags & M_MCAST) 2842 txq->vtntx_stats.vtxs_omcasts++; 2843 2844 m_freem(m); 2845 uma_zfree(vtnet_tx_header_zone, txhdr); 2846 } 2847 2848 if (virtqueue_empty(vq)) 2849 txq->vtntx_watchdog = 0; 2850 2851 return (deq); 2852 } 2853 2854 static void 2855 vtnet_tx_vq_intr(void *xtxq) 2856 { 2857 struct vtnet_softc *sc; 2858 struct vtnet_txq *txq; 2859 struct ifnet *ifp; 2860 2861 txq = xtxq; 2862 sc = txq->vtntx_sc; 2863 ifp = sc->vtnet_ifp; 2864 2865 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2866 /* 2867 * Ignore this interrupt. Either this is a spurious interrupt 2868 * or multiqueue without per-VQ MSIX so every queue needs to 2869 * be polled (a brain dead configuration we could try harder 2870 * to avoid). 2871 */ 2872 vtnet_txq_disable_intr(txq); 2873 return; 2874 } 2875 2876 #ifdef DEV_NETMAP 2877 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2878 return; 2879 #endif /* DEV_NETMAP */ 2880 2881 VTNET_TXQ_LOCK(txq); 2882 2883 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2884 VTNET_TXQ_UNLOCK(txq); 2885 return; 2886 } 2887 2888 vtnet_txq_eof(txq); 2889 vtnet_txq_start(txq); 2890 2891 VTNET_TXQ_UNLOCK(txq); 2892 } 2893 2894 static void 2895 vtnet_tx_start_all(struct vtnet_softc *sc) 2896 { 2897 struct vtnet_txq *txq; 2898 int i; 2899 2900 VTNET_CORE_LOCK_ASSERT(sc); 2901 2902 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2903 txq = &sc->vtnet_txqs[i]; 2904 2905 VTNET_TXQ_LOCK(txq); 2906 vtnet_txq_start(txq); 2907 VTNET_TXQ_UNLOCK(txq); 2908 } 2909 } 2910 2911 #ifndef VTNET_LEGACY_TX 2912 static void 2913 vtnet_qflush(struct ifnet *ifp) 2914 { 2915 struct vtnet_softc *sc; 2916 struct vtnet_txq *txq; 2917 struct mbuf *m; 2918 int i; 2919 2920 sc = ifp->if_softc; 2921 2922 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2923 txq = &sc->vtnet_txqs[i]; 2924 2925 VTNET_TXQ_LOCK(txq); 2926 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2927 m_freem(m); 2928 VTNET_TXQ_UNLOCK(txq); 2929 } 2930 2931 if_qflush(ifp); 2932 } 2933 #endif 2934 2935 static int 2936 vtnet_watchdog(struct vtnet_txq *txq) 2937 { 2938 struct ifnet *ifp; 2939 2940 ifp = txq->vtntx_sc->vtnet_ifp; 2941 2942 VTNET_TXQ_LOCK(txq); 2943 if (txq->vtntx_watchdog == 1) { 2944 /* 2945 * Only drain completed frames if the watchdog is about to 2946 * expire. If any frames were drained, there may be enough 2947 * free descriptors now available to transmit queued frames. 2948 * In that case, the timer will immediately be decremented 2949 * below, but the timeout is generous enough that should not 2950 * be a problem. 2951 */ 2952 if (vtnet_txq_eof(txq) != 0) 2953 vtnet_txq_start(txq); 2954 } 2955 2956 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2957 VTNET_TXQ_UNLOCK(txq); 2958 return (0); 2959 } 2960 VTNET_TXQ_UNLOCK(txq); 2961 2962 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2963 return (1); 2964 } 2965 2966 static void 2967 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2968 struct vtnet_txq_stats *txacc) 2969 { 2970 2971 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2972 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2973 2974 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2975 struct vtnet_rxq_stats *rxst; 2976 struct vtnet_txq_stats *txst; 2977 2978 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2979 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2980 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2981 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2982 rxacc->vrxs_csum += rxst->vrxs_csum; 2983 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2984 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2985 2986 txst = &sc->vtnet_txqs[i].vtntx_stats; 2987 txacc->vtxs_opackets += txst->vtxs_opackets; 2988 txacc->vtxs_obytes += txst->vtxs_obytes; 2989 txacc->vtxs_csum += txst->vtxs_csum; 2990 txacc->vtxs_tso += txst->vtxs_tso; 2991 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2992 } 2993 } 2994 2995 static uint64_t 2996 vtnet_get_counter(if_t ifp, ift_counter cnt) 2997 { 2998 struct vtnet_softc *sc; 2999 struct vtnet_rxq_stats rxaccum; 3000 struct vtnet_txq_stats txaccum; 3001 3002 sc = if_getsoftc(ifp); 3003 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3004 3005 switch (cnt) { 3006 case IFCOUNTER_IPACKETS: 3007 return (rxaccum.vrxs_ipackets); 3008 case IFCOUNTER_IQDROPS: 3009 return (rxaccum.vrxs_iqdrops); 3010 case IFCOUNTER_IERRORS: 3011 return (rxaccum.vrxs_ierrors); 3012 case IFCOUNTER_OPACKETS: 3013 return (txaccum.vtxs_opackets); 3014 #ifndef VTNET_LEGACY_TX 3015 case IFCOUNTER_OBYTES: 3016 return (txaccum.vtxs_obytes); 3017 case IFCOUNTER_OMCASTS: 3018 return (txaccum.vtxs_omcasts); 3019 #endif 3020 default: 3021 return (if_get_counter_default(ifp, cnt)); 3022 } 3023 } 3024 3025 static void 3026 vtnet_tick(void *xsc) 3027 { 3028 struct vtnet_softc *sc; 3029 struct ifnet *ifp; 3030 int i, timedout; 3031 3032 sc = xsc; 3033 ifp = sc->vtnet_ifp; 3034 timedout = 0; 3035 3036 VTNET_CORE_LOCK_ASSERT(sc); 3037 3038 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3039 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3040 3041 if (timedout != 0) { 3042 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3043 vtnet_init_locked(sc, 0); 3044 } else 3045 callout_schedule(&sc->vtnet_tick_ch, hz); 3046 } 3047 3048 static void 3049 vtnet_start_taskqueues(struct vtnet_softc *sc) 3050 { 3051 device_t dev; 3052 struct vtnet_rxq *rxq; 3053 struct vtnet_txq *txq; 3054 int i, error; 3055 3056 dev = sc->vtnet_dev; 3057 3058 /* 3059 * Errors here are very difficult to recover from - we cannot 3060 * easily fail because, if this is during boot, we will hang 3061 * when freeing any successfully started taskqueues because 3062 * the scheduler isn't up yet. 3063 * 3064 * Most drivers just ignore the return value - it only fails 3065 * with ENOMEM so an error is not likely. 3066 */ 3067 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3068 rxq = &sc->vtnet_rxqs[i]; 3069 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3070 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3071 if (error) { 3072 device_printf(dev, "failed to start rx taskq %d\n", 3073 rxq->vtnrx_id); 3074 } 3075 3076 txq = &sc->vtnet_txqs[i]; 3077 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3078 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3079 if (error) { 3080 device_printf(dev, "failed to start tx taskq %d\n", 3081 txq->vtntx_id); 3082 } 3083 } 3084 } 3085 3086 static void 3087 vtnet_free_taskqueues(struct vtnet_softc *sc) 3088 { 3089 struct vtnet_rxq *rxq; 3090 struct vtnet_txq *txq; 3091 int i; 3092 3093 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3094 rxq = &sc->vtnet_rxqs[i]; 3095 if (rxq->vtnrx_tq != NULL) { 3096 taskqueue_free(rxq->vtnrx_tq); 3097 rxq->vtnrx_tq = NULL; 3098 } 3099 3100 txq = &sc->vtnet_txqs[i]; 3101 if (txq->vtntx_tq != NULL) { 3102 taskqueue_free(txq->vtntx_tq); 3103 txq->vtntx_tq = NULL; 3104 } 3105 } 3106 } 3107 3108 static void 3109 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3110 { 3111 struct vtnet_rxq *rxq; 3112 struct vtnet_txq *txq; 3113 int i; 3114 3115 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3116 rxq = &sc->vtnet_rxqs[i]; 3117 if (rxq->vtnrx_tq != NULL) 3118 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3119 3120 txq = &sc->vtnet_txqs[i]; 3121 if (txq->vtntx_tq != NULL) { 3122 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3123 #ifndef VTNET_LEGACY_TX 3124 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3125 #endif 3126 } 3127 } 3128 } 3129 3130 static void 3131 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3132 { 3133 struct vtnet_rxq *rxq; 3134 struct vtnet_txq *txq; 3135 int i; 3136 3137 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3138 rxq = &sc->vtnet_rxqs[i]; 3139 vtnet_rxq_free_mbufs(rxq); 3140 3141 txq = &sc->vtnet_txqs[i]; 3142 vtnet_txq_free_mbufs(txq); 3143 } 3144 } 3145 3146 static void 3147 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3148 { 3149 struct vtnet_rxq *rxq; 3150 struct vtnet_txq *txq; 3151 int i; 3152 3153 VTNET_CORE_LOCK_ASSERT(sc); 3154 3155 /* 3156 * Lock and unlock the per-queue mutex so we known the stop 3157 * state is visible. Doing only the active queues should be 3158 * sufficient, but it does not cost much extra to do all the 3159 * queues. 3160 */ 3161 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3162 rxq = &sc->vtnet_rxqs[i]; 3163 VTNET_RXQ_LOCK(rxq); 3164 VTNET_RXQ_UNLOCK(rxq); 3165 3166 txq = &sc->vtnet_txqs[i]; 3167 VTNET_TXQ_LOCK(txq); 3168 VTNET_TXQ_UNLOCK(txq); 3169 } 3170 } 3171 3172 static void 3173 vtnet_stop(struct vtnet_softc *sc) 3174 { 3175 device_t dev; 3176 struct ifnet *ifp; 3177 3178 dev = sc->vtnet_dev; 3179 ifp = sc->vtnet_ifp; 3180 3181 VTNET_CORE_LOCK_ASSERT(sc); 3182 3183 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3184 sc->vtnet_link_active = 0; 3185 callout_stop(&sc->vtnet_tick_ch); 3186 3187 /* Only advisory. */ 3188 vtnet_disable_interrupts(sc); 3189 3190 #ifdef DEV_NETMAP 3191 /* Stop any pending txsync/rxsync and disable them. */ 3192 netmap_disable_all_rings(ifp); 3193 #endif /* DEV_NETMAP */ 3194 3195 /* 3196 * Stop the host adapter. This resets it to the pre-initialized 3197 * state. It will not generate any interrupts until after it is 3198 * reinitialized. 3199 */ 3200 virtio_stop(dev); 3201 vtnet_stop_rendezvous(sc); 3202 3203 vtnet_drain_rxtx_queues(sc); 3204 sc->vtnet_act_vq_pairs = 1; 3205 } 3206 3207 static int 3208 vtnet_virtio_reinit(struct vtnet_softc *sc) 3209 { 3210 device_t dev; 3211 struct ifnet *ifp; 3212 uint64_t features; 3213 int error; 3214 3215 dev = sc->vtnet_dev; 3216 ifp = sc->vtnet_ifp; 3217 features = sc->vtnet_negotiated_features; 3218 3219 /* 3220 * Re-negotiate with the host, removing any disabled receive 3221 * features. Transmit features are disabled only on our side 3222 * via if_capenable and if_hwassist. 3223 */ 3224 3225 if ((ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3226 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3227 3228 if ((ifp->if_capenable & IFCAP_LRO) == 0) 3229 features &= ~VTNET_LRO_FEATURES; 3230 3231 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 3232 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3233 3234 error = virtio_reinit(dev, features); 3235 if (error) { 3236 device_printf(dev, "virtio reinit error %d\n", error); 3237 return (error); 3238 } 3239 3240 sc->vtnet_features = features; 3241 virtio_reinit_complete(dev); 3242 3243 return (0); 3244 } 3245 3246 static void 3247 vtnet_init_rx_filters(struct vtnet_softc *sc) 3248 { 3249 struct ifnet *ifp; 3250 3251 ifp = sc->vtnet_ifp; 3252 3253 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3254 vtnet_rx_filter(sc); 3255 vtnet_rx_filter_mac(sc); 3256 } 3257 3258 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 3259 vtnet_rx_filter_vlan(sc); 3260 } 3261 3262 static int 3263 vtnet_init_rx_queues(struct vtnet_softc *sc) 3264 { 3265 device_t dev; 3266 struct ifnet *ifp; 3267 struct vtnet_rxq *rxq; 3268 int i, clustersz, error; 3269 3270 dev = sc->vtnet_dev; 3271 ifp = sc->vtnet_ifp; 3272 3273 clustersz = vtnet_rx_cluster_size(sc, ifp->if_mtu); 3274 sc->vtnet_rx_clustersz = clustersz; 3275 3276 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3277 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3278 VTNET_MAX_RX_SIZE, clustersz); 3279 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3280 ("%s: too many rx mbufs %d for %d segments", __func__, 3281 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3282 } else 3283 sc->vtnet_rx_nmbufs = 1; 3284 3285 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3286 rxq = &sc->vtnet_rxqs[i]; 3287 3288 /* Hold the lock to satisfy asserts. */ 3289 VTNET_RXQ_LOCK(rxq); 3290 error = vtnet_rxq_populate(rxq); 3291 VTNET_RXQ_UNLOCK(rxq); 3292 3293 if (error) { 3294 device_printf(dev, "cannot populate Rx queue %d\n", i); 3295 return (error); 3296 } 3297 } 3298 3299 return (0); 3300 } 3301 3302 static int 3303 vtnet_init_tx_queues(struct vtnet_softc *sc) 3304 { 3305 struct vtnet_txq *txq; 3306 int i; 3307 3308 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3309 txq = &sc->vtnet_txqs[i]; 3310 txq->vtntx_watchdog = 0; 3311 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3312 #ifdef DEV_NETMAP 3313 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3314 #endif /* DEV_NETMAP */ 3315 } 3316 3317 return (0); 3318 } 3319 3320 static int 3321 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3322 { 3323 int error; 3324 3325 error = vtnet_init_rx_queues(sc); 3326 if (error) 3327 return (error); 3328 3329 error = vtnet_init_tx_queues(sc); 3330 if (error) 3331 return (error); 3332 3333 return (0); 3334 } 3335 3336 static void 3337 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3338 { 3339 device_t dev; 3340 int npairs; 3341 3342 dev = sc->vtnet_dev; 3343 3344 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3345 sc->vtnet_act_vq_pairs = 1; 3346 return; 3347 } 3348 3349 npairs = sc->vtnet_req_vq_pairs; 3350 3351 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3352 device_printf(dev, "cannot set active queue pairs to %d, " 3353 "falling back to 1 queue pair\n", npairs); 3354 npairs = 1; 3355 } 3356 3357 sc->vtnet_act_vq_pairs = npairs; 3358 } 3359 3360 static void 3361 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3362 { 3363 struct ifnet *ifp; 3364 uint64_t features; 3365 int error; 3366 3367 ifp = sc->vtnet_ifp; 3368 features = sc->vtnet_features; 3369 3370 VTNET_CORE_LOCK_ASSERT(sc); 3371 3372 if (ifp->if_capabilities & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3373 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3374 features |= VIRTIO_NET_F_GUEST_CSUM; 3375 else 3376 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3377 } 3378 3379 if (ifp->if_capabilities & IFCAP_LRO && !vtnet_software_lro(sc)) { 3380 if (ifp->if_capenable & IFCAP_LRO) 3381 features |= VTNET_LRO_FEATURES; 3382 else 3383 features &= ~VTNET_LRO_FEATURES; 3384 } 3385 3386 error = vtnet_ctrl_guest_offloads(sc, 3387 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3388 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3389 VIRTIO_NET_F_GUEST_UFO)); 3390 if (error) { 3391 device_printf(sc->vtnet_dev, 3392 "%s: cannot update Rx features\n", __func__); 3393 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 3394 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3395 vtnet_init_locked(sc, 0); 3396 } 3397 } else 3398 sc->vtnet_features = features; 3399 } 3400 3401 static int 3402 vtnet_reinit(struct vtnet_softc *sc) 3403 { 3404 struct ifnet *ifp; 3405 int error; 3406 3407 ifp = sc->vtnet_ifp; 3408 3409 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3410 3411 error = vtnet_virtio_reinit(sc); 3412 if (error) 3413 return (error); 3414 3415 vtnet_set_macaddr(sc); 3416 vtnet_set_active_vq_pairs(sc); 3417 3418 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3419 vtnet_init_rx_filters(sc); 3420 3421 ifp->if_hwassist = 0; 3422 if (ifp->if_capenable & IFCAP_TXCSUM) 3423 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3424 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3425 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3426 if (ifp->if_capenable & IFCAP_TSO4) 3427 ifp->if_hwassist |= CSUM_IP_TSO; 3428 if (ifp->if_capenable & IFCAP_TSO6) 3429 ifp->if_hwassist |= CSUM_IP6_TSO; 3430 3431 error = vtnet_init_rxtx_queues(sc); 3432 if (error) 3433 return (error); 3434 3435 return (0); 3436 } 3437 3438 static void 3439 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3440 { 3441 struct ifnet *ifp; 3442 3443 ifp = sc->vtnet_ifp; 3444 3445 VTNET_CORE_LOCK_ASSERT(sc); 3446 3447 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3448 return; 3449 3450 vtnet_stop(sc); 3451 3452 #ifdef DEV_NETMAP 3453 /* Once stopped we can update the netmap flags, if necessary. */ 3454 switch (init_mode) { 3455 case VTNET_INIT_NETMAP_ENTER: 3456 nm_set_native_flags(NA(ifp)); 3457 break; 3458 case VTNET_INIT_NETMAP_EXIT: 3459 nm_clear_native_flags(NA(ifp)); 3460 break; 3461 } 3462 #endif /* DEV_NETMAP */ 3463 3464 if (vtnet_reinit(sc) != 0) { 3465 vtnet_stop(sc); 3466 return; 3467 } 3468 3469 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3470 vtnet_update_link_status(sc); 3471 vtnet_enable_interrupts(sc); 3472 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3473 3474 #ifdef DEV_NETMAP 3475 /* Re-enable txsync/rxsync. */ 3476 netmap_enable_all_rings(ifp); 3477 #endif /* DEV_NETMAP */ 3478 } 3479 3480 static void 3481 vtnet_init(void *xsc) 3482 { 3483 struct vtnet_softc *sc; 3484 3485 sc = xsc; 3486 3487 VTNET_CORE_LOCK(sc); 3488 vtnet_init_locked(sc, 0); 3489 VTNET_CORE_UNLOCK(sc); 3490 } 3491 3492 static void 3493 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3494 { 3495 3496 /* 3497 * The control virtqueue is only polled and therefore it should 3498 * already be empty. 3499 */ 3500 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3501 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3502 } 3503 3504 static void 3505 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3506 struct sglist *sg, int readable, int writable) 3507 { 3508 struct virtqueue *vq; 3509 3510 vq = sc->vtnet_ctrl_vq; 3511 3512 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3513 VTNET_CORE_LOCK_ASSERT(sc); 3514 3515 if (!virtqueue_empty(vq)) 3516 return; 3517 3518 /* 3519 * Poll for the response, but the command is likely completed before 3520 * returning from the notify. 3521 */ 3522 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3523 virtqueue_notify(vq); 3524 virtqueue_poll(vq, NULL); 3525 } 3526 } 3527 3528 static int 3529 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3530 { 3531 struct sglist_seg segs[3]; 3532 struct sglist sg; 3533 struct { 3534 struct virtio_net_ctrl_hdr hdr __aligned(2); 3535 uint8_t pad1; 3536 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3537 uint8_t pad2; 3538 uint8_t ack; 3539 } s; 3540 int error; 3541 3542 error = 0; 3543 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3544 3545 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3546 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3547 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3548 s.ack = VIRTIO_NET_ERR; 3549 3550 sglist_init(&sg, nitems(segs), segs); 3551 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3552 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3553 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3554 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3555 3556 if (error == 0) 3557 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3558 3559 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3560 } 3561 3562 static int 3563 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3564 { 3565 struct sglist_seg segs[3]; 3566 struct sglist sg; 3567 struct { 3568 struct virtio_net_ctrl_hdr hdr __aligned(2); 3569 uint8_t pad1; 3570 uint64_t offloads __aligned(8); 3571 uint8_t pad2; 3572 uint8_t ack; 3573 } s; 3574 int error; 3575 3576 error = 0; 3577 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3578 3579 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3580 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3581 s.offloads = vtnet_gtoh64(sc, offloads); 3582 s.ack = VIRTIO_NET_ERR; 3583 3584 sglist_init(&sg, nitems(segs), segs); 3585 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3586 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3587 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3588 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3589 3590 if (error == 0) 3591 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3592 3593 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3594 } 3595 3596 static int 3597 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3598 { 3599 struct sglist_seg segs[3]; 3600 struct sglist sg; 3601 struct { 3602 struct virtio_net_ctrl_hdr hdr __aligned(2); 3603 uint8_t pad1; 3604 struct virtio_net_ctrl_mq mq __aligned(2); 3605 uint8_t pad2; 3606 uint8_t ack; 3607 } s; 3608 int error; 3609 3610 error = 0; 3611 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3612 3613 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3614 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3615 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3616 s.ack = VIRTIO_NET_ERR; 3617 3618 sglist_init(&sg, nitems(segs), segs); 3619 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3620 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3621 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3622 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3623 3624 if (error == 0) 3625 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3626 3627 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3628 } 3629 3630 static int 3631 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3632 { 3633 struct sglist_seg segs[3]; 3634 struct sglist sg; 3635 struct { 3636 struct virtio_net_ctrl_hdr hdr __aligned(2); 3637 uint8_t pad1; 3638 uint8_t onoff; 3639 uint8_t pad2; 3640 uint8_t ack; 3641 } s; 3642 int error; 3643 3644 error = 0; 3645 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3646 3647 s.hdr.class = VIRTIO_NET_CTRL_RX; 3648 s.hdr.cmd = cmd; 3649 s.onoff = on; 3650 s.ack = VIRTIO_NET_ERR; 3651 3652 sglist_init(&sg, nitems(segs), segs); 3653 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3654 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3655 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3656 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3657 3658 if (error == 0) 3659 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3660 3661 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3662 } 3663 3664 static int 3665 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3666 { 3667 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3668 } 3669 3670 static int 3671 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3672 { 3673 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3674 } 3675 3676 static void 3677 vtnet_rx_filter(struct vtnet_softc *sc) 3678 { 3679 device_t dev; 3680 struct ifnet *ifp; 3681 3682 dev = sc->vtnet_dev; 3683 ifp = sc->vtnet_ifp; 3684 3685 VTNET_CORE_LOCK_ASSERT(sc); 3686 3687 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) { 3688 device_printf(dev, "cannot %s promiscuous mode\n", 3689 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3690 } 3691 3692 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) { 3693 device_printf(dev, "cannot %s all-multicast mode\n", 3694 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3695 } 3696 } 3697 3698 static u_int 3699 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3700 { 3701 struct vtnet_softc *sc = arg; 3702 3703 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3704 return (0); 3705 3706 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3707 bcopy(LLADDR(sdl), 3708 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3709 ETHER_ADDR_LEN); 3710 3711 return (1); 3712 } 3713 3714 static u_int 3715 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3716 { 3717 struct vtnet_mac_filter *filter = arg; 3718 3719 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3720 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3721 ETHER_ADDR_LEN); 3722 3723 return (1); 3724 } 3725 3726 static void 3727 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3728 { 3729 struct virtio_net_ctrl_hdr hdr __aligned(2); 3730 struct vtnet_mac_filter *filter; 3731 struct sglist_seg segs[4]; 3732 struct sglist sg; 3733 struct ifnet *ifp; 3734 bool promisc, allmulti; 3735 u_int ucnt, mcnt; 3736 int error; 3737 uint8_t ack; 3738 3739 ifp = sc->vtnet_ifp; 3740 filter = sc->vtnet_mac_filter; 3741 error = 0; 3742 3743 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3744 VTNET_CORE_LOCK_ASSERT(sc); 3745 3746 /* Unicast MAC addresses: */ 3747 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3748 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3749 3750 if (promisc) { 3751 ucnt = 0; 3752 if_printf(ifp, "more than %d MAC addresses assigned, " 3753 "falling back to promiscuous mode\n", 3754 VTNET_MAX_MAC_ENTRIES); 3755 } 3756 3757 /* Multicast MAC addresses: */ 3758 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3759 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3760 3761 if (allmulti) { 3762 mcnt = 0; 3763 if_printf(ifp, "more than %d multicast MAC addresses " 3764 "assigned, falling back to all-multicast mode\n", 3765 VTNET_MAX_MAC_ENTRIES); 3766 } 3767 3768 if (promisc && allmulti) 3769 goto out; 3770 3771 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3772 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3773 3774 hdr.class = VIRTIO_NET_CTRL_MAC; 3775 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3776 ack = VIRTIO_NET_ERR; 3777 3778 sglist_init(&sg, nitems(segs), segs); 3779 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3780 error |= sglist_append(&sg, &filter->vmf_unicast, 3781 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3782 error |= sglist_append(&sg, &filter->vmf_multicast, 3783 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3784 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3785 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3786 3787 if (error == 0) 3788 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3789 if (ack != VIRTIO_NET_OK) 3790 if_printf(ifp, "error setting host MAC filter table\n"); 3791 3792 out: 3793 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3794 if_printf(ifp, "cannot enable promiscuous mode\n"); 3795 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3796 if_printf(ifp, "cannot enable all-multicast mode\n"); 3797 } 3798 3799 static int 3800 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3801 { 3802 struct sglist_seg segs[3]; 3803 struct sglist sg; 3804 struct { 3805 struct virtio_net_ctrl_hdr hdr __aligned(2); 3806 uint8_t pad1; 3807 uint16_t tag __aligned(2); 3808 uint8_t pad2; 3809 uint8_t ack; 3810 } s; 3811 int error; 3812 3813 error = 0; 3814 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3815 3816 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3817 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3818 s.tag = vtnet_gtoh16(sc, tag); 3819 s.ack = VIRTIO_NET_ERR; 3820 3821 sglist_init(&sg, nitems(segs), segs); 3822 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3823 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3824 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3825 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3826 3827 if (error == 0) 3828 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3829 3830 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3831 } 3832 3833 static void 3834 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3835 { 3836 int i, bit; 3837 uint32_t w; 3838 uint16_t tag; 3839 3840 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3841 VTNET_CORE_LOCK_ASSERT(sc); 3842 3843 /* Enable the filter for each configured VLAN. */ 3844 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3845 w = sc->vtnet_vlan_filter[i]; 3846 3847 while ((bit = ffs(w) - 1) != -1) { 3848 w &= ~(1 << bit); 3849 tag = sizeof(w) * CHAR_BIT * i + bit; 3850 3851 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3852 device_printf(sc->vtnet_dev, 3853 "cannot enable VLAN %d filter\n", tag); 3854 } 3855 } 3856 } 3857 } 3858 3859 static void 3860 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3861 { 3862 struct ifnet *ifp; 3863 int idx, bit; 3864 3865 ifp = sc->vtnet_ifp; 3866 idx = (tag >> 5) & 0x7F; 3867 bit = tag & 0x1F; 3868 3869 if (tag == 0 || tag > 4095) 3870 return; 3871 3872 VTNET_CORE_LOCK(sc); 3873 3874 if (add) 3875 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3876 else 3877 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3878 3879 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3880 ifp->if_drv_flags & IFF_DRV_RUNNING && 3881 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3882 device_printf(sc->vtnet_dev, 3883 "cannot %s VLAN %d %s the host filter table\n", 3884 add ? "add" : "remove", tag, add ? "to" : "from"); 3885 } 3886 3887 VTNET_CORE_UNLOCK(sc); 3888 } 3889 3890 static void 3891 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3892 { 3893 3894 if (ifp->if_softc != arg) 3895 return; 3896 3897 vtnet_update_vlan_filter(arg, 1, tag); 3898 } 3899 3900 static void 3901 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3902 { 3903 3904 if (ifp->if_softc != arg) 3905 return; 3906 3907 vtnet_update_vlan_filter(arg, 0, tag); 3908 } 3909 3910 static void 3911 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3912 { 3913 struct ifnet *ifp; 3914 uint32_t speed; 3915 3916 ifp = sc->vtnet_ifp; 3917 3918 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3919 return; 3920 3921 /* BMV: Ignore duplex. */ 3922 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3923 offsetof(struct virtio_net_config, speed)); 3924 if (speed != UINT32_MAX) 3925 ifp->if_baudrate = IF_Mbps(speed); 3926 } 3927 3928 static int 3929 vtnet_is_link_up(struct vtnet_softc *sc) 3930 { 3931 uint16_t status; 3932 3933 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3934 return (1); 3935 3936 status = virtio_read_dev_config_2(sc->vtnet_dev, 3937 offsetof(struct virtio_net_config, status)); 3938 3939 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3940 } 3941 3942 static void 3943 vtnet_update_link_status(struct vtnet_softc *sc) 3944 { 3945 struct ifnet *ifp; 3946 int link; 3947 3948 ifp = sc->vtnet_ifp; 3949 VTNET_CORE_LOCK_ASSERT(sc); 3950 link = vtnet_is_link_up(sc); 3951 3952 /* Notify if the link status has changed. */ 3953 if (link != 0 && sc->vtnet_link_active == 0) { 3954 vtnet_update_speed_duplex(sc); 3955 sc->vtnet_link_active = 1; 3956 if_link_state_change(ifp, LINK_STATE_UP); 3957 } else if (link == 0 && sc->vtnet_link_active != 0) { 3958 sc->vtnet_link_active = 0; 3959 if_link_state_change(ifp, LINK_STATE_DOWN); 3960 } 3961 } 3962 3963 static int 3964 vtnet_ifmedia_upd(struct ifnet *ifp __unused) 3965 { 3966 return (EOPNOTSUPP); 3967 } 3968 3969 static void 3970 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3971 { 3972 struct vtnet_softc *sc; 3973 3974 sc = ifp->if_softc; 3975 3976 ifmr->ifm_status = IFM_AVALID; 3977 ifmr->ifm_active = IFM_ETHER; 3978 3979 VTNET_CORE_LOCK(sc); 3980 if (vtnet_is_link_up(sc) != 0) { 3981 ifmr->ifm_status |= IFM_ACTIVE; 3982 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3983 } else 3984 ifmr->ifm_active |= IFM_NONE; 3985 VTNET_CORE_UNLOCK(sc); 3986 } 3987 3988 static void 3989 vtnet_get_macaddr(struct vtnet_softc *sc) 3990 { 3991 3992 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3993 virtio_read_device_config_array(sc->vtnet_dev, 3994 offsetof(struct virtio_net_config, mac), 3995 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 3996 } else { 3997 /* Generate a random locally administered unicast address. */ 3998 sc->vtnet_hwaddr[0] = 0xB2; 3999 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4000 } 4001 } 4002 4003 static void 4004 vtnet_set_macaddr(struct vtnet_softc *sc) 4005 { 4006 device_t dev; 4007 int error; 4008 4009 dev = sc->vtnet_dev; 4010 4011 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4012 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4013 if (error) 4014 device_printf(dev, "unable to set MAC address\n"); 4015 return; 4016 } 4017 4018 /* MAC in config is read-only in modern VirtIO. */ 4019 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4020 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4021 virtio_write_dev_config_1(dev, 4022 offsetof(struct virtio_net_config, mac) + i, 4023 sc->vtnet_hwaddr[i]); 4024 } 4025 } 4026 } 4027 4028 static void 4029 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4030 { 4031 4032 /* Assign MAC address if it was generated. */ 4033 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4034 vtnet_set_macaddr(sc); 4035 } 4036 4037 static void 4038 vtnet_vlan_tag_remove(struct mbuf *m) 4039 { 4040 struct ether_vlan_header *evh; 4041 4042 evh = mtod(m, struct ether_vlan_header *); 4043 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4044 m->m_flags |= M_VLANTAG; 4045 4046 /* Strip the 802.1Q header. */ 4047 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4048 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4049 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4050 } 4051 4052 static void 4053 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4054 { 4055 int limit; 4056 4057 limit = vtnet_tunable_int(sc, "rx_process_limit", 4058 vtnet_rx_process_limit); 4059 if (limit < 0) 4060 limit = INT_MAX; 4061 sc->vtnet_rx_process_limit = limit; 4062 } 4063 4064 static void 4065 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4066 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4067 { 4068 struct sysctl_oid *node; 4069 struct sysctl_oid_list *list; 4070 struct vtnet_rxq_stats *stats; 4071 char namebuf[16]; 4072 4073 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4074 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4075 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4076 list = SYSCTL_CHILDREN(node); 4077 4078 stats = &rxq->vtnrx_stats; 4079 4080 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4081 &stats->vrxs_ipackets, "Receive packets"); 4082 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4083 &stats->vrxs_ibytes, "Receive bytes"); 4084 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4085 &stats->vrxs_iqdrops, "Receive drops"); 4086 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4087 &stats->vrxs_ierrors, "Receive errors"); 4088 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4089 &stats->vrxs_csum, "Receive checksum offloaded"); 4090 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4091 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4092 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4093 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4094 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4095 &stats->vrxs_rescheduled, 4096 "Receive interrupt handler rescheduled"); 4097 } 4098 4099 static void 4100 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4101 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4102 { 4103 struct sysctl_oid *node; 4104 struct sysctl_oid_list *list; 4105 struct vtnet_txq_stats *stats; 4106 char namebuf[16]; 4107 4108 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4109 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4110 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4111 list = SYSCTL_CHILDREN(node); 4112 4113 stats = &txq->vtntx_stats; 4114 4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4116 &stats->vtxs_opackets, "Transmit packets"); 4117 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4118 &stats->vtxs_obytes, "Transmit bytes"); 4119 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4120 &stats->vtxs_omcasts, "Transmit multicasts"); 4121 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4122 &stats->vtxs_csum, "Transmit checksum offloaded"); 4123 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4124 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4125 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4126 &stats->vtxs_rescheduled, 4127 "Transmit interrupt handler rescheduled"); 4128 } 4129 4130 static void 4131 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4132 { 4133 device_t dev; 4134 struct sysctl_ctx_list *ctx; 4135 struct sysctl_oid *tree; 4136 struct sysctl_oid_list *child; 4137 int i; 4138 4139 dev = sc->vtnet_dev; 4140 ctx = device_get_sysctl_ctx(dev); 4141 tree = device_get_sysctl_tree(dev); 4142 child = SYSCTL_CHILDREN(tree); 4143 4144 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4145 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4146 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4147 } 4148 } 4149 4150 static void 4151 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4152 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4153 { 4154 struct vtnet_statistics *stats; 4155 struct vtnet_rxq_stats rxaccum; 4156 struct vtnet_txq_stats txaccum; 4157 4158 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4159 4160 stats = &sc->vtnet_stats; 4161 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4162 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4163 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4164 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4165 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4166 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4167 4168 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4169 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4170 "Mbuf cluster allocation failures"); 4171 4172 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4173 CTLFLAG_RD, &stats->rx_frame_too_large, 4174 "Received frame larger than the mbuf chain"); 4175 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4176 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4177 "Enqueuing the replacement receive mbuf failed"); 4178 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4179 CTLFLAG_RD, &stats->rx_mergeable_failed, 4180 "Mergeable buffers receive failures"); 4181 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4182 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4183 "Received checksum offloaded buffer with unsupported " 4184 "Ethernet type"); 4185 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4186 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4187 "Received checksum offloaded buffer with incorrect IP protocol"); 4188 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4189 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4190 "Received checksum offloaded buffer with incorrect offset"); 4191 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4192 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4193 "Received checksum offloaded buffer with incorrect protocol"); 4194 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4195 CTLFLAG_RD, &stats->rx_csum_failed, 4196 "Received buffer checksum offload failed"); 4197 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4198 CTLFLAG_RD, &stats->rx_csum_offloaded, 4199 "Received buffer checksum offload succeeded"); 4200 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4201 CTLFLAG_RD, &stats->rx_task_rescheduled, 4202 "Times the receive interrupt task rescheduled itself"); 4203 4204 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4205 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4206 "Aborted transmit of checksum offloaded buffer with unknown " 4207 "Ethernet type"); 4208 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4209 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4210 "Aborted transmit of checksum offloaded buffer because mismatched " 4211 "protocols"); 4212 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4213 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4214 "Aborted transmit of TSO buffer with non TCP protocol"); 4215 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4216 CTLFLAG_RD, &stats->tx_tso_without_csum, 4217 "Aborted transmit of TSO buffer without TCP checksum offload"); 4218 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4219 CTLFLAG_RD, &stats->tx_defragged, 4220 "Transmit mbufs defragged"); 4221 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4222 CTLFLAG_RD, &stats->tx_defrag_failed, 4223 "Aborted transmit of buffer because defrag failed"); 4224 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4225 CTLFLAG_RD, &stats->tx_csum_offloaded, 4226 "Offloaded checksum of transmitted buffer"); 4227 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4228 CTLFLAG_RD, &stats->tx_tso_offloaded, 4229 "Segmentation offload of transmitted buffer"); 4230 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4231 CTLFLAG_RD, &stats->tx_task_rescheduled, 4232 "Times the transmit interrupt task rescheduled itself"); 4233 } 4234 4235 static void 4236 vtnet_setup_sysctl(struct vtnet_softc *sc) 4237 { 4238 device_t dev; 4239 struct sysctl_ctx_list *ctx; 4240 struct sysctl_oid *tree; 4241 struct sysctl_oid_list *child; 4242 4243 dev = sc->vtnet_dev; 4244 ctx = device_get_sysctl_ctx(dev); 4245 tree = device_get_sysctl_tree(dev); 4246 child = SYSCTL_CHILDREN(tree); 4247 4248 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4249 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4250 "Number of maximum supported virtqueue pairs"); 4251 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4252 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4253 "Number of requested virtqueue pairs"); 4254 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4255 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4256 "Number of active virtqueue pairs"); 4257 4258 vtnet_setup_stat_sysctl(ctx, child, sc); 4259 } 4260 4261 static void 4262 vtnet_load_tunables(struct vtnet_softc *sc) 4263 { 4264 4265 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4266 "lro_entry_count", vtnet_lro_entry_count); 4267 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4268 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4269 4270 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4271 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4272 } 4273 4274 static int 4275 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4276 { 4277 4278 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4279 } 4280 4281 static void 4282 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4283 { 4284 4285 virtqueue_disable_intr(rxq->vtnrx_vq); 4286 } 4287 4288 static int 4289 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4290 { 4291 struct virtqueue *vq; 4292 4293 vq = txq->vtntx_vq; 4294 4295 if (vtnet_txq_below_threshold(txq) != 0) 4296 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4297 4298 /* 4299 * The free count is above our threshold. Keep the Tx interrupt 4300 * disabled until the queue is fuller. 4301 */ 4302 return (0); 4303 } 4304 4305 static void 4306 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4307 { 4308 4309 virtqueue_disable_intr(txq->vtntx_vq); 4310 } 4311 4312 static void 4313 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4314 { 4315 struct vtnet_rxq *rxq; 4316 int i; 4317 4318 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4319 rxq = &sc->vtnet_rxqs[i]; 4320 if (vtnet_rxq_enable_intr(rxq) != 0) 4321 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4322 } 4323 } 4324 4325 static void 4326 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4327 { 4328 int i; 4329 4330 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4331 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4332 } 4333 4334 static void 4335 vtnet_enable_interrupts(struct vtnet_softc *sc) 4336 { 4337 4338 vtnet_enable_rx_interrupts(sc); 4339 vtnet_enable_tx_interrupts(sc); 4340 } 4341 4342 static void 4343 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4344 { 4345 int i; 4346 4347 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4348 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4349 } 4350 4351 static void 4352 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4353 { 4354 int i; 4355 4356 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4357 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4358 } 4359 4360 static void 4361 vtnet_disable_interrupts(struct vtnet_softc *sc) 4362 { 4363 4364 vtnet_disable_rx_interrupts(sc); 4365 vtnet_disable_tx_interrupts(sc); 4366 } 4367 4368 static int 4369 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4370 { 4371 char path[64]; 4372 4373 snprintf(path, sizeof(path), 4374 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4375 TUNABLE_INT_FETCH(path, &def); 4376 4377 return (def); 4378 } 4379 4380 #ifdef DEBUGNET 4381 static void 4382 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4383 { 4384 struct vtnet_softc *sc; 4385 4386 sc = if_getsoftc(ifp); 4387 4388 VTNET_CORE_LOCK(sc); 4389 *nrxr = sc->vtnet_req_vq_pairs; 4390 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4391 *clsize = sc->vtnet_rx_clustersz; 4392 VTNET_CORE_UNLOCK(sc); 4393 } 4394 4395 static void 4396 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4397 { 4398 } 4399 4400 static int 4401 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4402 { 4403 struct vtnet_softc *sc; 4404 struct vtnet_txq *txq; 4405 int error; 4406 4407 sc = if_getsoftc(ifp); 4408 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4409 IFF_DRV_RUNNING) 4410 return (EBUSY); 4411 4412 txq = &sc->vtnet_txqs[0]; 4413 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4414 if (error == 0) 4415 (void)vtnet_txq_notify(txq); 4416 return (error); 4417 } 4418 4419 static int 4420 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4421 { 4422 struct vtnet_softc *sc; 4423 int i; 4424 4425 sc = if_getsoftc(ifp); 4426 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4427 IFF_DRV_RUNNING) 4428 return (EBUSY); 4429 4430 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4431 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4432 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4433 return (0); 4434 } 4435 #endif /* DEBUGNET */ 4436