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) 1306 vtnet_rx_filter(sc); 1307 else { 1308 if ((ifp->if_flags ^ sc->vtnet_if_flags) & IFF_ALLMULTI) 1309 return (ENOTSUP); 1310 ifp->if_flags |= IFF_PROMISC; 1311 } 1312 } 1313 1314 out: 1315 sc->vtnet_if_flags = ifp->if_flags; 1316 return (0); 1317 } 1318 1319 static int 1320 vtnet_ioctl_multi(struct vtnet_softc *sc) 1321 { 1322 struct ifnet *ifp; 1323 1324 ifp = sc->vtnet_ifp; 1325 1326 VTNET_CORE_LOCK_ASSERT(sc); 1327 1328 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1329 ifp->if_drv_flags & IFF_DRV_RUNNING) 1330 vtnet_rx_filter_mac(sc); 1331 1332 return (0); 1333 } 1334 1335 static int 1336 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1337 { 1338 struct ifnet *ifp; 1339 int mask, reinit, update; 1340 1341 ifp = sc->vtnet_ifp; 1342 mask = (ifr->ifr_reqcap & ifp->if_capabilities) ^ ifp->if_capenable; 1343 reinit = update = 0; 1344 1345 VTNET_CORE_LOCK_ASSERT(sc); 1346 1347 if (mask & IFCAP_TXCSUM) 1348 ifp->if_capenable ^= IFCAP_TXCSUM; 1349 if (mask & IFCAP_TXCSUM_IPV6) 1350 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; 1351 if (mask & IFCAP_TSO4) 1352 ifp->if_capenable ^= IFCAP_TSO4; 1353 if (mask & IFCAP_TSO6) 1354 ifp->if_capenable ^= IFCAP_TSO6; 1355 1356 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1357 /* 1358 * These Rx features require the negotiated features to 1359 * be updated. Avoid a full reinit if possible. 1360 */ 1361 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1362 update = 1; 1363 else 1364 reinit = 1; 1365 1366 /* BMV: Avoid needless renegotiation for just software LRO. */ 1367 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1368 IFCAP_LRO && vtnet_software_lro(sc)) 1369 reinit = update = 0; 1370 1371 if (mask & IFCAP_RXCSUM) 1372 ifp->if_capenable ^= IFCAP_RXCSUM; 1373 if (mask & IFCAP_RXCSUM_IPV6) 1374 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; 1375 if (mask & IFCAP_LRO) 1376 ifp->if_capenable ^= IFCAP_LRO; 1377 1378 /* 1379 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1380 * so treat them as a pair. Guest TSO (LRO) requires receive 1381 * checksums. 1382 */ 1383 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1384 ifp->if_capenable |= IFCAP_RXCSUM; 1385 #ifdef notyet 1386 ifp->if_capenable |= IFCAP_RXCSUM_IPV6; 1387 #endif 1388 } else 1389 ifp->if_capenable &= 1390 ~(IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO); 1391 } 1392 1393 if (mask & IFCAP_VLAN_HWFILTER) { 1394 /* These Rx features require renegotiation. */ 1395 reinit = 1; 1396 1397 if (mask & IFCAP_VLAN_HWFILTER) 1398 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1399 } 1400 1401 if (mask & IFCAP_VLAN_HWTSO) 1402 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1403 if (mask & IFCAP_VLAN_HWTAGGING) 1404 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1405 1406 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1407 if (reinit) { 1408 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1409 vtnet_init_locked(sc, 0); 1410 } else if (update) 1411 vtnet_update_rx_offloads(sc); 1412 } 1413 1414 return (0); 1415 } 1416 1417 static int 1418 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1419 { 1420 struct vtnet_softc *sc; 1421 struct ifreq *ifr; 1422 int error; 1423 1424 sc = ifp->if_softc; 1425 ifr = (struct ifreq *) data; 1426 error = 0; 1427 1428 switch (cmd) { 1429 case SIOCSIFMTU: 1430 VTNET_CORE_LOCK(sc); 1431 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1432 VTNET_CORE_UNLOCK(sc); 1433 break; 1434 1435 case SIOCSIFFLAGS: 1436 VTNET_CORE_LOCK(sc); 1437 error = vtnet_ioctl_ifflags(sc); 1438 VTNET_CORE_UNLOCK(sc); 1439 break; 1440 1441 case SIOCADDMULTI: 1442 case SIOCDELMULTI: 1443 VTNET_CORE_LOCK(sc); 1444 error = vtnet_ioctl_multi(sc); 1445 VTNET_CORE_UNLOCK(sc); 1446 break; 1447 1448 case SIOCSIFMEDIA: 1449 case SIOCGIFMEDIA: 1450 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1451 break; 1452 1453 case SIOCSIFCAP: 1454 VTNET_CORE_LOCK(sc); 1455 error = vtnet_ioctl_ifcap(sc, ifr); 1456 VTNET_CORE_UNLOCK(sc); 1457 VLAN_CAPABILITIES(ifp); 1458 break; 1459 1460 default: 1461 error = ether_ioctl(ifp, cmd, data); 1462 break; 1463 } 1464 1465 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1466 1467 return (error); 1468 } 1469 1470 static int 1471 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1472 { 1473 struct virtqueue *vq; 1474 int nbufs, error; 1475 1476 #ifdef DEV_NETMAP 1477 error = vtnet_netmap_rxq_populate(rxq); 1478 if (error >= 0) 1479 return (error); 1480 #endif /* DEV_NETMAP */ 1481 1482 vq = rxq->vtnrx_vq; 1483 error = ENOSPC; 1484 1485 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1486 error = vtnet_rxq_new_buf(rxq); 1487 if (error) 1488 break; 1489 } 1490 1491 if (nbufs > 0) { 1492 virtqueue_notify(vq); 1493 /* 1494 * EMSGSIZE signifies the virtqueue did not have enough 1495 * entries available to hold the last mbuf. This is not 1496 * an error. 1497 */ 1498 if (error == EMSGSIZE) 1499 error = 0; 1500 } 1501 1502 return (error); 1503 } 1504 1505 static void 1506 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1507 { 1508 struct virtqueue *vq; 1509 struct mbuf *m; 1510 int last; 1511 #ifdef DEV_NETMAP 1512 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1513 rxq->vtnrx_id, NR_RX); 1514 #else /* !DEV_NETMAP */ 1515 void *kring = NULL; 1516 #endif /* !DEV_NETMAP */ 1517 1518 vq = rxq->vtnrx_vq; 1519 last = 0; 1520 1521 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1522 if (kring == NULL) 1523 m_freem(m); 1524 } 1525 1526 KASSERT(virtqueue_empty(vq), 1527 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1528 } 1529 1530 static struct mbuf * 1531 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1532 { 1533 struct mbuf *m_head, *m_tail, *m; 1534 int i, size; 1535 1536 m_head = NULL; 1537 size = sc->vtnet_rx_clustersz; 1538 1539 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1540 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1541 1542 for (i = 0; i < nbufs; i++) { 1543 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1544 if (m == NULL) { 1545 sc->vtnet_stats.mbuf_alloc_failed++; 1546 m_freem(m_head); 1547 return (NULL); 1548 } 1549 1550 m->m_len = size; 1551 if (m_head != NULL) { 1552 m_tail->m_next = m; 1553 m_tail = m; 1554 } else 1555 m_head = m_tail = m; 1556 } 1557 1558 if (m_tailp != NULL) 1559 *m_tailp = m_tail; 1560 1561 return (m_head); 1562 } 1563 1564 /* 1565 * Slow path for when LRO without mergeable buffers is negotiated. 1566 */ 1567 static int 1568 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1569 int len0) 1570 { 1571 struct vtnet_softc *sc; 1572 struct mbuf *m, *m_prev, *m_new, *m_tail; 1573 int len, clustersz, nreplace, error; 1574 1575 sc = rxq->vtnrx_sc; 1576 clustersz = sc->vtnet_rx_clustersz; 1577 1578 m_prev = NULL; 1579 m_tail = NULL; 1580 nreplace = 0; 1581 1582 m = m0; 1583 len = len0; 1584 1585 /* 1586 * Since these mbuf chains are so large, avoid allocating a complete 1587 * replacement when the received frame did not consume the entire 1588 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1589 */ 1590 while (len > 0) { 1591 if (m == NULL) { 1592 sc->vtnet_stats.rx_frame_too_large++; 1593 return (EMSGSIZE); 1594 } 1595 1596 /* 1597 * Every mbuf should have the expected cluster size since that 1598 * is also used to allocate the replacements. 1599 */ 1600 KASSERT(m->m_len == clustersz, 1601 ("%s: mbuf size %d not expected cluster size %d", __func__, 1602 m->m_len, clustersz)); 1603 1604 m->m_len = MIN(m->m_len, len); 1605 len -= m->m_len; 1606 1607 m_prev = m; 1608 m = m->m_next; 1609 nreplace++; 1610 } 1611 1612 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1613 ("%s: invalid replacement mbuf count %d max %d", __func__, 1614 nreplace, sc->vtnet_rx_nmbufs)); 1615 1616 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1617 if (m_new == NULL) { 1618 m_prev->m_len = clustersz; 1619 return (ENOBUFS); 1620 } 1621 1622 /* 1623 * Move any unused mbufs from the received mbuf chain onto the 1624 * end of the replacement chain. 1625 */ 1626 if (m_prev->m_next != NULL) { 1627 m_tail->m_next = m_prev->m_next; 1628 m_prev->m_next = NULL; 1629 } 1630 1631 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1632 if (error) { 1633 /* 1634 * The replacement is suppose to be an copy of the one 1635 * dequeued so this is a very unexpected error. 1636 * 1637 * Restore the m0 chain to the original state if it was 1638 * modified so we can then discard it. 1639 */ 1640 if (m_tail->m_next != NULL) { 1641 m_prev->m_next = m_tail->m_next; 1642 m_tail->m_next = NULL; 1643 } 1644 m_prev->m_len = clustersz; 1645 sc->vtnet_stats.rx_enq_replacement_failed++; 1646 m_freem(m_new); 1647 } 1648 1649 return (error); 1650 } 1651 1652 static int 1653 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1654 { 1655 struct vtnet_softc *sc; 1656 struct mbuf *m_new; 1657 int error; 1658 1659 sc = rxq->vtnrx_sc; 1660 1661 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1662 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1663 1664 MPASS(m->m_next == NULL); 1665 if (m->m_len < len) 1666 return (EMSGSIZE); 1667 1668 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1669 if (m_new == NULL) 1670 return (ENOBUFS); 1671 1672 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1673 if (error) { 1674 sc->vtnet_stats.rx_enq_replacement_failed++; 1675 m_freem(m_new); 1676 } else 1677 m->m_len = len; 1678 1679 return (error); 1680 } 1681 1682 static int 1683 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1684 { 1685 struct vtnet_softc *sc; 1686 struct sglist *sg; 1687 int header_inlined, error; 1688 1689 sc = rxq->vtnrx_sc; 1690 sg = rxq->vtnrx_sg; 1691 1692 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1693 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1694 VTNET_RXQ_LOCK_ASSERT(rxq); 1695 1696 sglist_reset(sg); 1697 header_inlined = vtnet_modern(sc) || 1698 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1699 1700 if (header_inlined) 1701 error = sglist_append_mbuf(sg, m); 1702 else { 1703 struct vtnet_rx_header *rxhdr = 1704 mtod(m, struct vtnet_rx_header *); 1705 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1706 1707 /* Append the header and remaining mbuf data. */ 1708 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1709 if (error) 1710 return (error); 1711 error = sglist_append(sg, &rxhdr[1], 1712 m->m_len - sizeof(struct vtnet_rx_header)); 1713 if (error) 1714 return (error); 1715 1716 if (m->m_next != NULL) 1717 error = sglist_append_mbuf(sg, m->m_next); 1718 } 1719 1720 if (error) 1721 return (error); 1722 1723 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1724 } 1725 1726 static int 1727 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1728 { 1729 struct vtnet_softc *sc; 1730 struct mbuf *m; 1731 int error; 1732 1733 sc = rxq->vtnrx_sc; 1734 1735 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1736 if (m == NULL) 1737 return (ENOBUFS); 1738 1739 error = vtnet_rxq_enqueue_buf(rxq, m); 1740 if (error) 1741 m_freem(m); 1742 1743 return (error); 1744 } 1745 1746 static int 1747 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1748 int hoff, struct virtio_net_hdr *hdr) 1749 { 1750 struct vtnet_softc *sc; 1751 int error; 1752 1753 sc = rxq->vtnrx_sc; 1754 1755 /* 1756 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1757 * not have an analogous CSUM flag. The checksum has been validated, 1758 * but is incomplete (TCP/UDP pseudo header). 1759 * 1760 * The packet is likely from another VM on the same host that itself 1761 * performed checksum offloading so Tx/Rx is basically a memcpy and 1762 * the checksum has little value. 1763 * 1764 * Default to receiving the packet as-is for performance reasons, but 1765 * this can cause issues if the packet is to be forwarded because it 1766 * does not contain a valid checksum. This patch may be helpful: 1767 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1768 * compute the checksum if requested. 1769 * 1770 * BMV: Need to add an CSUM_PARTIAL flag? 1771 */ 1772 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1773 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1774 return (error); 1775 } 1776 1777 /* 1778 * Compute the checksum in the driver so the packet will contain a 1779 * valid checksum. The checksum is at csum_offset from csum_start. 1780 */ 1781 switch (etype) { 1782 #if defined(INET) || defined(INET6) 1783 case ETHERTYPE_IP: 1784 case ETHERTYPE_IPV6: { 1785 int csum_off, csum_end; 1786 uint16_t csum; 1787 1788 csum_off = hdr->csum_start + hdr->csum_offset; 1789 csum_end = csum_off + sizeof(uint16_t); 1790 1791 /* Assume checksum will be in the first mbuf. */ 1792 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1793 return (1); 1794 1795 /* 1796 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1797 * checksum and write it at the specified offset. We could 1798 * try to verify the packet: csum_start should probably 1799 * correspond to the start of the TCP/UDP header. 1800 * 1801 * BMV: Need to properly handle UDP with zero checksum. Is 1802 * the IPv4 header checksum implicitly validated? 1803 */ 1804 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1805 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1806 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1807 m->m_pkthdr.csum_data = 0xFFFF; 1808 break; 1809 } 1810 #endif 1811 default: 1812 sc->vtnet_stats.rx_csum_bad_ethtype++; 1813 return (1); 1814 } 1815 1816 return (0); 1817 } 1818 1819 static int 1820 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1821 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1822 { 1823 #if 0 1824 struct vtnet_softc *sc; 1825 #endif 1826 int protocol; 1827 1828 #if 0 1829 sc = rxq->vtnrx_sc; 1830 #endif 1831 1832 switch (etype) { 1833 #if defined(INET) 1834 case ETHERTYPE_IP: 1835 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1836 protocol = IPPROTO_DONE; 1837 else { 1838 struct ip *ip = (struct ip *)(m->m_data + hoff); 1839 protocol = ip->ip_p; 1840 } 1841 break; 1842 #endif 1843 #if defined(INET6) 1844 case ETHERTYPE_IPV6: 1845 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1846 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1847 protocol = IPPROTO_DONE; 1848 break; 1849 #endif 1850 default: 1851 protocol = IPPROTO_DONE; 1852 break; 1853 } 1854 1855 switch (protocol) { 1856 case IPPROTO_TCP: 1857 case IPPROTO_UDP: 1858 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1859 m->m_pkthdr.csum_data = 0xFFFF; 1860 break; 1861 default: 1862 /* 1863 * FreeBSD does not support checksum offloading of this 1864 * protocol. Let the stack re-verify the checksum later 1865 * if the protocol is supported. 1866 */ 1867 #if 0 1868 if_printf(sc->vtnet_ifp, 1869 "%s: checksum offload of unsupported protocol " 1870 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1871 __func__, etype, protocol, hdr->csum_start, 1872 hdr->csum_offset); 1873 #endif 1874 break; 1875 } 1876 1877 return (0); 1878 } 1879 1880 static int 1881 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1882 struct virtio_net_hdr *hdr) 1883 { 1884 const struct ether_header *eh; 1885 int hoff; 1886 uint16_t etype; 1887 1888 eh = mtod(m, const struct ether_header *); 1889 etype = ntohs(eh->ether_type); 1890 if (etype == ETHERTYPE_VLAN) { 1891 /* TODO BMV: Handle QinQ. */ 1892 const struct ether_vlan_header *evh = 1893 mtod(m, const struct ether_vlan_header *); 1894 etype = ntohs(evh->evl_proto); 1895 hoff = sizeof(struct ether_vlan_header); 1896 } else 1897 hoff = sizeof(struct ether_header); 1898 1899 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1900 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1901 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1902 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1903 } 1904 1905 static void 1906 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1907 { 1908 struct mbuf *m; 1909 1910 while (--nbufs > 0) { 1911 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1912 if (m == NULL) 1913 break; 1914 vtnet_rxq_discard_buf(rxq, m); 1915 } 1916 } 1917 1918 static void 1919 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1920 { 1921 int error __diagused; 1922 1923 /* 1924 * Requeue the discarded mbuf. This should always be successful 1925 * since it was just dequeued. 1926 */ 1927 error = vtnet_rxq_enqueue_buf(rxq, m); 1928 KASSERT(error == 0, 1929 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1930 } 1931 1932 static int 1933 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1934 { 1935 struct vtnet_softc *sc; 1936 struct virtqueue *vq; 1937 struct mbuf *m_tail; 1938 1939 sc = rxq->vtnrx_sc; 1940 vq = rxq->vtnrx_vq; 1941 m_tail = m_head; 1942 1943 while (--nbufs > 0) { 1944 struct mbuf *m; 1945 uint32_t len; 1946 1947 m = virtqueue_dequeue(vq, &len); 1948 if (m == NULL) { 1949 rxq->vtnrx_stats.vrxs_ierrors++; 1950 goto fail; 1951 } 1952 1953 if (vtnet_rxq_new_buf(rxq) != 0) { 1954 rxq->vtnrx_stats.vrxs_iqdrops++; 1955 vtnet_rxq_discard_buf(rxq, m); 1956 if (nbufs > 1) 1957 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1958 goto fail; 1959 } 1960 1961 if (m->m_len < len) 1962 len = m->m_len; 1963 1964 m->m_len = len; 1965 m->m_flags &= ~M_PKTHDR; 1966 1967 m_head->m_pkthdr.len += len; 1968 m_tail->m_next = m; 1969 m_tail = m; 1970 } 1971 1972 return (0); 1973 1974 fail: 1975 sc->vtnet_stats.rx_mergeable_failed++; 1976 m_freem(m_head); 1977 1978 return (1); 1979 } 1980 1981 #if defined(INET) || defined(INET6) 1982 static int 1983 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1984 { 1985 struct lro_ctrl *lro; 1986 1987 lro = &rxq->vtnrx_lro; 1988 1989 if (lro->lro_mbuf_max != 0) { 1990 tcp_lro_queue_mbuf(lro, m); 1991 return (0); 1992 } 1993 1994 return (tcp_lro_rx(lro, m, 0)); 1995 } 1996 #endif 1997 1998 static void 1999 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2000 struct virtio_net_hdr *hdr) 2001 { 2002 struct vtnet_softc *sc; 2003 struct ifnet *ifp; 2004 2005 sc = rxq->vtnrx_sc; 2006 ifp = sc->vtnet_ifp; 2007 2008 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 2009 struct ether_header *eh = mtod(m, struct ether_header *); 2010 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2011 vtnet_vlan_tag_remove(m); 2012 /* 2013 * With the 802.1Q header removed, update the 2014 * checksum starting location accordingly. 2015 */ 2016 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2017 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2018 } 2019 } 2020 2021 m->m_pkthdr.flowid = rxq->vtnrx_id; 2022 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2023 2024 if (hdr->flags & 2025 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2026 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2027 rxq->vtnrx_stats.vrxs_csum++; 2028 else 2029 rxq->vtnrx_stats.vrxs_csum_failed++; 2030 } 2031 2032 if (hdr->gso_size != 0) { 2033 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2034 case VIRTIO_NET_HDR_GSO_TCPV4: 2035 case VIRTIO_NET_HDR_GSO_TCPV6: 2036 m->m_pkthdr.lro_nsegs = 2037 howmany(m->m_pkthdr.len, hdr->gso_size); 2038 rxq->vtnrx_stats.vrxs_host_lro++; 2039 break; 2040 } 2041 } 2042 2043 rxq->vtnrx_stats.vrxs_ipackets++; 2044 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2045 2046 #if defined(INET) || defined(INET6) 2047 if (vtnet_software_lro(sc) && ifp->if_capenable & IFCAP_LRO) { 2048 if (vtnet_lro_rx(rxq, m) == 0) 2049 return; 2050 } 2051 #endif 2052 2053 (*ifp->if_input)(ifp, m); 2054 } 2055 2056 static int 2057 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2058 { 2059 struct virtio_net_hdr lhdr, *hdr; 2060 struct vtnet_softc *sc; 2061 struct ifnet *ifp; 2062 struct virtqueue *vq; 2063 int deq, count; 2064 2065 sc = rxq->vtnrx_sc; 2066 vq = rxq->vtnrx_vq; 2067 ifp = sc->vtnet_ifp; 2068 deq = 0; 2069 count = sc->vtnet_rx_process_limit; 2070 2071 VTNET_RXQ_LOCK_ASSERT(rxq); 2072 2073 while (count-- > 0) { 2074 struct mbuf *m; 2075 uint32_t len, nbufs, adjsz; 2076 2077 m = virtqueue_dequeue(vq, &len); 2078 if (m == NULL) 2079 break; 2080 deq++; 2081 2082 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2083 rxq->vtnrx_stats.vrxs_ierrors++; 2084 vtnet_rxq_discard_buf(rxq, m); 2085 continue; 2086 } 2087 2088 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2089 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2090 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2091 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2092 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2093 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2094 } else if (vtnet_modern(sc)) { 2095 nbufs = 1; /* num_buffers is always 1 */ 2096 adjsz = sizeof(struct virtio_net_hdr_v1); 2097 } else { 2098 nbufs = 1; 2099 adjsz = sizeof(struct vtnet_rx_header); 2100 /* 2101 * Account for our gap between the header and start of 2102 * data to keep the segments separated. 2103 */ 2104 len += VTNET_RX_HEADER_PAD; 2105 } 2106 2107 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2108 rxq->vtnrx_stats.vrxs_iqdrops++; 2109 vtnet_rxq_discard_buf(rxq, m); 2110 if (nbufs > 1) 2111 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2112 continue; 2113 } 2114 2115 m->m_pkthdr.len = len; 2116 m->m_pkthdr.rcvif = ifp; 2117 m->m_pkthdr.csum_flags = 0; 2118 2119 if (nbufs > 1) { 2120 /* Dequeue the rest of chain. */ 2121 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2122 continue; 2123 } 2124 2125 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2126 2127 /* 2128 * Save an endian swapped version of the header prior to it 2129 * being stripped. The header is always at the start of the 2130 * mbuf data. num_buffers was already saved (and not needed) 2131 * so use the standard header. 2132 */ 2133 hdr = mtod(m, struct virtio_net_hdr *); 2134 lhdr.flags = hdr->flags; 2135 lhdr.gso_type = hdr->gso_type; 2136 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2137 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2138 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2139 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2140 m_adj(m, adjsz); 2141 2142 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2143 pfil_return_t pfil; 2144 2145 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 2146 NULL); 2147 switch (pfil) { 2148 case PFIL_REALLOCED: 2149 m = pfil_mem2mbuf(m->m_data); 2150 break; 2151 case PFIL_DROPPED: 2152 case PFIL_CONSUMED: 2153 continue; 2154 default: 2155 KASSERT(pfil == PFIL_PASS, 2156 ("Filter returned %d!", pfil)); 2157 } 2158 } 2159 2160 vtnet_rxq_input(rxq, m, &lhdr); 2161 } 2162 2163 if (deq > 0) { 2164 #if defined(INET) || defined(INET6) 2165 if (vtnet_software_lro(sc)) 2166 tcp_lro_flush_all(&rxq->vtnrx_lro); 2167 #endif 2168 virtqueue_notify(vq); 2169 } 2170 2171 return (count > 0 ? 0 : EAGAIN); 2172 } 2173 2174 static void 2175 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2176 { 2177 struct vtnet_softc *sc; 2178 struct ifnet *ifp; 2179 u_int more; 2180 #ifdef DEV_NETMAP 2181 int nmirq; 2182 #endif /* DEV_NETMAP */ 2183 2184 sc = rxq->vtnrx_sc; 2185 ifp = sc->vtnet_ifp; 2186 2187 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2188 /* 2189 * Ignore this interrupt. Either this is a spurious interrupt 2190 * or multiqueue without per-VQ MSIX so every queue needs to 2191 * be polled (a brain dead configuration we could try harder 2192 * to avoid). 2193 */ 2194 vtnet_rxq_disable_intr(rxq); 2195 return; 2196 } 2197 2198 VTNET_RXQ_LOCK(rxq); 2199 2200 #ifdef DEV_NETMAP 2201 /* 2202 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2203 * This is not necessary to serialize the access to the RX vq, but 2204 * rather to avoid races that may happen if this interface is 2205 * attached to a VALE switch, which would cause received packets 2206 * to stall in the RX queue (nm_kr_tryget() could find the kring 2207 * busy when called from netmap_bwrap_intr_notify()). 2208 */ 2209 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2210 if (nmirq != NM_IRQ_PASS) { 2211 VTNET_RXQ_UNLOCK(rxq); 2212 if (nmirq == NM_IRQ_RESCHED) { 2213 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2214 } 2215 return; 2216 } 2217 #endif /* DEV_NETMAP */ 2218 2219 again: 2220 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2221 VTNET_RXQ_UNLOCK(rxq); 2222 return; 2223 } 2224 2225 more = vtnet_rxq_eof(rxq); 2226 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2227 if (!more) 2228 vtnet_rxq_disable_intr(rxq); 2229 /* 2230 * This is an occasional condition or race (when !more), 2231 * so retry a few times before scheduling the taskqueue. 2232 */ 2233 if (tries-- > 0) 2234 goto again; 2235 2236 rxq->vtnrx_stats.vrxs_rescheduled++; 2237 VTNET_RXQ_UNLOCK(rxq); 2238 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2239 } else 2240 VTNET_RXQ_UNLOCK(rxq); 2241 } 2242 2243 static void 2244 vtnet_rx_vq_intr(void *xrxq) 2245 { 2246 struct vtnet_rxq *rxq; 2247 2248 rxq = xrxq; 2249 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2250 } 2251 2252 static void 2253 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2254 { 2255 struct vtnet_rxq *rxq; 2256 2257 rxq = xrxq; 2258 vtnet_rx_vq_process(rxq, 0); 2259 } 2260 2261 static int 2262 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2263 { 2264 struct vtnet_softc *sc; 2265 int threshold; 2266 2267 sc = txq->vtntx_sc; 2268 2269 /* 2270 * The Tx interrupt is disabled until the queue free count falls 2271 * below our threshold. Completed frames are drained from the Tx 2272 * virtqueue before transmitting new frames and in the watchdog 2273 * callout, so the frequency of Tx interrupts is greatly reduced, 2274 * at the cost of not freeing mbufs as quickly as they otherwise 2275 * would be. 2276 */ 2277 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2278 2279 /* 2280 * Without indirect descriptors, leave enough room for the most 2281 * segments we handle. 2282 */ 2283 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2284 threshold < sc->vtnet_tx_nsegs) 2285 threshold = sc->vtnet_tx_nsegs; 2286 2287 return (threshold); 2288 } 2289 2290 static int 2291 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2292 { 2293 struct virtqueue *vq; 2294 2295 vq = txq->vtntx_vq; 2296 2297 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2298 } 2299 2300 static int 2301 vtnet_txq_notify(struct vtnet_txq *txq) 2302 { 2303 struct virtqueue *vq; 2304 2305 vq = txq->vtntx_vq; 2306 2307 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2308 virtqueue_notify(vq); 2309 2310 if (vtnet_txq_enable_intr(txq) == 0) 2311 return (0); 2312 2313 /* 2314 * Drain frames that were completed since last checked. If this 2315 * causes the queue to go above the threshold, the caller should 2316 * continue transmitting. 2317 */ 2318 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2319 virtqueue_disable_intr(vq); 2320 return (1); 2321 } 2322 2323 return (0); 2324 } 2325 2326 static void 2327 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2328 { 2329 struct virtqueue *vq; 2330 struct vtnet_tx_header *txhdr; 2331 int last; 2332 #ifdef DEV_NETMAP 2333 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2334 txq->vtntx_id, NR_TX); 2335 #else /* !DEV_NETMAP */ 2336 void *kring = NULL; 2337 #endif /* !DEV_NETMAP */ 2338 2339 vq = txq->vtntx_vq; 2340 last = 0; 2341 2342 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2343 if (kring == NULL) { 2344 m_freem(txhdr->vth_mbuf); 2345 uma_zfree(vtnet_tx_header_zone, txhdr); 2346 } 2347 } 2348 2349 KASSERT(virtqueue_empty(vq), 2350 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2351 } 2352 2353 /* 2354 * BMV: This can go away once we finally have offsets in the mbuf header. 2355 */ 2356 static int 2357 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2358 int *proto, int *start) 2359 { 2360 struct vtnet_softc *sc; 2361 struct ether_vlan_header *evh; 2362 int offset; 2363 2364 sc = txq->vtntx_sc; 2365 2366 evh = mtod(m, struct ether_vlan_header *); 2367 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2368 /* BMV: We should handle nested VLAN tags too. */ 2369 *etype = ntohs(evh->evl_proto); 2370 offset = sizeof(struct ether_vlan_header); 2371 } else { 2372 *etype = ntohs(evh->evl_encap_proto); 2373 offset = sizeof(struct ether_header); 2374 } 2375 2376 switch (*etype) { 2377 #if defined(INET) 2378 case ETHERTYPE_IP: { 2379 struct ip *ip, iphdr; 2380 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2381 m_copydata(m, offset, sizeof(struct ip), 2382 (caddr_t) &iphdr); 2383 ip = &iphdr; 2384 } else 2385 ip = (struct ip *)(m->m_data + offset); 2386 *proto = ip->ip_p; 2387 *start = offset + (ip->ip_hl << 2); 2388 break; 2389 } 2390 #endif 2391 #if defined(INET6) 2392 case ETHERTYPE_IPV6: 2393 *proto = -1; 2394 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2395 /* Assert the network stack sent us a valid packet. */ 2396 KASSERT(*start > offset, 2397 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2398 *start, offset, *proto)); 2399 break; 2400 #endif 2401 default: 2402 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2403 return (EINVAL); 2404 } 2405 2406 return (0); 2407 } 2408 2409 static int 2410 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2411 int offset, struct virtio_net_hdr *hdr) 2412 { 2413 static struct timeval lastecn; 2414 static int curecn; 2415 struct vtnet_softc *sc; 2416 struct tcphdr *tcp, tcphdr; 2417 2418 sc = txq->vtntx_sc; 2419 2420 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2421 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2422 tcp = &tcphdr; 2423 } else 2424 tcp = (struct tcphdr *)(m->m_data + offset); 2425 2426 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2427 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2428 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2429 VIRTIO_NET_HDR_GSO_TCPV6; 2430 2431 if (__predict_false(tcp->th_flags & TH_CWR)) { 2432 /* 2433 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2434 * FreeBSD, ECN support is not on a per-interface basis, 2435 * but globally via the net.inet.tcp.ecn.enable sysctl 2436 * knob. The default is off. 2437 */ 2438 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2439 if (ppsratecheck(&lastecn, &curecn, 1)) 2440 if_printf(sc->vtnet_ifp, 2441 "TSO with ECN not negotiated with host\n"); 2442 return (ENOTSUP); 2443 } 2444 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2445 } 2446 2447 txq->vtntx_stats.vtxs_tso++; 2448 2449 return (0); 2450 } 2451 2452 static struct mbuf * 2453 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2454 struct virtio_net_hdr *hdr) 2455 { 2456 struct vtnet_softc *sc; 2457 int flags, etype, csum_start, proto, error; 2458 2459 sc = txq->vtntx_sc; 2460 flags = m->m_pkthdr.csum_flags; 2461 2462 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2463 if (error) 2464 goto drop; 2465 2466 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2467 /* Sanity check the parsed mbuf matches the offload flags. */ 2468 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2469 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2470 && etype != ETHERTYPE_IPV6))) { 2471 sc->vtnet_stats.tx_csum_proto_mismatch++; 2472 goto drop; 2473 } 2474 2475 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2476 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2477 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2478 txq->vtntx_stats.vtxs_csum++; 2479 } 2480 2481 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2482 /* 2483 * Sanity check the parsed mbuf IP protocol is TCP, and 2484 * VirtIO TSO reqires the checksum offloading above. 2485 */ 2486 if (__predict_false(proto != IPPROTO_TCP)) { 2487 sc->vtnet_stats.tx_tso_not_tcp++; 2488 goto drop; 2489 } else if (__predict_false((hdr->flags & 2490 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2491 sc->vtnet_stats.tx_tso_without_csum++; 2492 goto drop; 2493 } 2494 2495 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2496 if (error) 2497 goto drop; 2498 } 2499 2500 return (m); 2501 2502 drop: 2503 m_freem(m); 2504 return (NULL); 2505 } 2506 2507 static int 2508 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2509 struct vtnet_tx_header *txhdr) 2510 { 2511 struct vtnet_softc *sc; 2512 struct virtqueue *vq; 2513 struct sglist *sg; 2514 struct mbuf *m; 2515 int error; 2516 2517 sc = txq->vtntx_sc; 2518 vq = txq->vtntx_vq; 2519 sg = txq->vtntx_sg; 2520 m = *m_head; 2521 2522 sglist_reset(sg); 2523 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2524 if (error != 0 || sg->sg_nseg != 1) { 2525 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2526 __func__, error, sg->sg_nseg)); 2527 goto fail; 2528 } 2529 2530 error = sglist_append_mbuf(sg, m); 2531 if (error) { 2532 m = m_defrag(m, M_NOWAIT); 2533 if (m == NULL) 2534 goto fail; 2535 2536 *m_head = m; 2537 sc->vtnet_stats.tx_defragged++; 2538 2539 error = sglist_append_mbuf(sg, m); 2540 if (error) 2541 goto fail; 2542 } 2543 2544 txhdr->vth_mbuf = m; 2545 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2546 2547 return (error); 2548 2549 fail: 2550 sc->vtnet_stats.tx_defrag_failed++; 2551 m_freem(*m_head); 2552 *m_head = NULL; 2553 2554 return (ENOBUFS); 2555 } 2556 2557 static int 2558 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2559 { 2560 struct vtnet_tx_header *txhdr; 2561 struct virtio_net_hdr *hdr; 2562 struct mbuf *m; 2563 int error; 2564 2565 m = *m_head; 2566 M_ASSERTPKTHDR(m); 2567 2568 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2569 if (txhdr == NULL) { 2570 m_freem(m); 2571 *m_head = NULL; 2572 return (ENOMEM); 2573 } 2574 2575 /* 2576 * Always use the non-mergeable header, regardless if mergable headers 2577 * were negotiated, because for transmit num_buffers is always zero. 2578 * The vtnet_hdr_size is used to enqueue the right header size segment. 2579 */ 2580 hdr = &txhdr->vth_uhdr.hdr; 2581 2582 if (m->m_flags & M_VLANTAG) { 2583 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2584 if ((*m_head = m) == NULL) { 2585 error = ENOBUFS; 2586 goto fail; 2587 } 2588 m->m_flags &= ~M_VLANTAG; 2589 } 2590 2591 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2592 m = vtnet_txq_offload(txq, m, hdr); 2593 if ((*m_head = m) == NULL) { 2594 error = ENOBUFS; 2595 goto fail; 2596 } 2597 } 2598 2599 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2600 fail: 2601 if (error) 2602 uma_zfree(vtnet_tx_header_zone, txhdr); 2603 2604 return (error); 2605 } 2606 2607 #ifdef VTNET_LEGACY_TX 2608 2609 static void 2610 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp) 2611 { 2612 struct vtnet_softc *sc; 2613 struct virtqueue *vq; 2614 struct mbuf *m0; 2615 int tries, enq; 2616 2617 sc = txq->vtntx_sc; 2618 vq = txq->vtntx_vq; 2619 tries = 0; 2620 2621 VTNET_TXQ_LOCK_ASSERT(txq); 2622 2623 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2624 sc->vtnet_link_active == 0) 2625 return; 2626 2627 vtnet_txq_eof(txq); 2628 2629 again: 2630 enq = 0; 2631 2632 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 2633 if (virtqueue_full(vq)) 2634 break; 2635 2636 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0); 2637 if (m0 == NULL) 2638 break; 2639 2640 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2641 if (m0 != NULL) 2642 IFQ_DRV_PREPEND(&ifp->if_snd, m0); 2643 break; 2644 } 2645 2646 enq++; 2647 ETHER_BPF_MTAP(ifp, m0); 2648 } 2649 2650 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2651 if (tries++ < VTNET_NOTIFY_RETRIES) 2652 goto again; 2653 2654 txq->vtntx_stats.vtxs_rescheduled++; 2655 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2656 } 2657 } 2658 2659 static void 2660 vtnet_start(struct ifnet *ifp) 2661 { 2662 struct vtnet_softc *sc; 2663 struct vtnet_txq *txq; 2664 2665 sc = ifp->if_softc; 2666 txq = &sc->vtnet_txqs[0]; 2667 2668 VTNET_TXQ_LOCK(txq); 2669 vtnet_start_locked(txq, ifp); 2670 VTNET_TXQ_UNLOCK(txq); 2671 } 2672 2673 #else /* !VTNET_LEGACY_TX */ 2674 2675 static int 2676 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2677 { 2678 struct vtnet_softc *sc; 2679 struct virtqueue *vq; 2680 struct buf_ring *br; 2681 struct ifnet *ifp; 2682 int enq, tries, error; 2683 2684 sc = txq->vtntx_sc; 2685 vq = txq->vtntx_vq; 2686 br = txq->vtntx_br; 2687 ifp = sc->vtnet_ifp; 2688 tries = 0; 2689 error = 0; 2690 2691 VTNET_TXQ_LOCK_ASSERT(txq); 2692 2693 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 2694 sc->vtnet_link_active == 0) { 2695 if (m != NULL) 2696 error = drbr_enqueue(ifp, br, m); 2697 return (error); 2698 } 2699 2700 if (m != NULL) { 2701 error = drbr_enqueue(ifp, br, m); 2702 if (error) 2703 return (error); 2704 } 2705 2706 vtnet_txq_eof(txq); 2707 2708 again: 2709 enq = 0; 2710 2711 while ((m = drbr_peek(ifp, br)) != NULL) { 2712 if (virtqueue_full(vq)) { 2713 drbr_putback(ifp, br, m); 2714 break; 2715 } 2716 2717 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2718 if (m != NULL) 2719 drbr_putback(ifp, br, m); 2720 else 2721 drbr_advance(ifp, br); 2722 break; 2723 } 2724 drbr_advance(ifp, br); 2725 2726 enq++; 2727 ETHER_BPF_MTAP(ifp, m); 2728 } 2729 2730 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2731 if (tries++ < VTNET_NOTIFY_RETRIES) 2732 goto again; 2733 2734 txq->vtntx_stats.vtxs_rescheduled++; 2735 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2736 } 2737 2738 return (0); 2739 } 2740 2741 static int 2742 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m) 2743 { 2744 struct vtnet_softc *sc; 2745 struct vtnet_txq *txq; 2746 int i, npairs, error; 2747 2748 sc = ifp->if_softc; 2749 npairs = sc->vtnet_act_vq_pairs; 2750 2751 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2752 i = m->m_pkthdr.flowid % npairs; 2753 else 2754 i = curcpu % npairs; 2755 2756 txq = &sc->vtnet_txqs[i]; 2757 2758 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2759 error = vtnet_txq_mq_start_locked(txq, m); 2760 VTNET_TXQ_UNLOCK(txq); 2761 } else { 2762 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2763 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2764 } 2765 2766 return (error); 2767 } 2768 2769 static void 2770 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2771 { 2772 struct vtnet_softc *sc; 2773 struct vtnet_txq *txq; 2774 2775 txq = xtxq; 2776 sc = txq->vtntx_sc; 2777 2778 VTNET_TXQ_LOCK(txq); 2779 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2780 vtnet_txq_mq_start_locked(txq, NULL); 2781 VTNET_TXQ_UNLOCK(txq); 2782 } 2783 2784 #endif /* VTNET_LEGACY_TX */ 2785 2786 static void 2787 vtnet_txq_start(struct vtnet_txq *txq) 2788 { 2789 struct vtnet_softc *sc; 2790 struct ifnet *ifp; 2791 2792 sc = txq->vtntx_sc; 2793 ifp = sc->vtnet_ifp; 2794 2795 #ifdef VTNET_LEGACY_TX 2796 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 2797 vtnet_start_locked(txq, ifp); 2798 #else 2799 if (!drbr_empty(ifp, txq->vtntx_br)) 2800 vtnet_txq_mq_start_locked(txq, NULL); 2801 #endif 2802 } 2803 2804 static void 2805 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2806 { 2807 struct vtnet_softc *sc; 2808 struct vtnet_txq *txq; 2809 struct ifnet *ifp; 2810 2811 txq = xtxq; 2812 sc = txq->vtntx_sc; 2813 ifp = sc->vtnet_ifp; 2814 2815 VTNET_TXQ_LOCK(txq); 2816 2817 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2818 VTNET_TXQ_UNLOCK(txq); 2819 return; 2820 } 2821 2822 vtnet_txq_eof(txq); 2823 vtnet_txq_start(txq); 2824 2825 VTNET_TXQ_UNLOCK(txq); 2826 } 2827 2828 static int 2829 vtnet_txq_eof(struct vtnet_txq *txq) 2830 { 2831 struct virtqueue *vq; 2832 struct vtnet_tx_header *txhdr; 2833 struct mbuf *m; 2834 int deq; 2835 2836 vq = txq->vtntx_vq; 2837 deq = 0; 2838 VTNET_TXQ_LOCK_ASSERT(txq); 2839 2840 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2841 m = txhdr->vth_mbuf; 2842 deq++; 2843 2844 txq->vtntx_stats.vtxs_opackets++; 2845 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2846 if (m->m_flags & M_MCAST) 2847 txq->vtntx_stats.vtxs_omcasts++; 2848 2849 m_freem(m); 2850 uma_zfree(vtnet_tx_header_zone, txhdr); 2851 } 2852 2853 if (virtqueue_empty(vq)) 2854 txq->vtntx_watchdog = 0; 2855 2856 return (deq); 2857 } 2858 2859 static void 2860 vtnet_tx_vq_intr(void *xtxq) 2861 { 2862 struct vtnet_softc *sc; 2863 struct vtnet_txq *txq; 2864 struct ifnet *ifp; 2865 2866 txq = xtxq; 2867 sc = txq->vtntx_sc; 2868 ifp = sc->vtnet_ifp; 2869 2870 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2871 /* 2872 * Ignore this interrupt. Either this is a spurious interrupt 2873 * or multiqueue without per-VQ MSIX so every queue needs to 2874 * be polled (a brain dead configuration we could try harder 2875 * to avoid). 2876 */ 2877 vtnet_txq_disable_intr(txq); 2878 return; 2879 } 2880 2881 #ifdef DEV_NETMAP 2882 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2883 return; 2884 #endif /* DEV_NETMAP */ 2885 2886 VTNET_TXQ_LOCK(txq); 2887 2888 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2889 VTNET_TXQ_UNLOCK(txq); 2890 return; 2891 } 2892 2893 vtnet_txq_eof(txq); 2894 vtnet_txq_start(txq); 2895 2896 VTNET_TXQ_UNLOCK(txq); 2897 } 2898 2899 static void 2900 vtnet_tx_start_all(struct vtnet_softc *sc) 2901 { 2902 struct vtnet_txq *txq; 2903 int i; 2904 2905 VTNET_CORE_LOCK_ASSERT(sc); 2906 2907 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2908 txq = &sc->vtnet_txqs[i]; 2909 2910 VTNET_TXQ_LOCK(txq); 2911 vtnet_txq_start(txq); 2912 VTNET_TXQ_UNLOCK(txq); 2913 } 2914 } 2915 2916 #ifndef VTNET_LEGACY_TX 2917 static void 2918 vtnet_qflush(struct ifnet *ifp) 2919 { 2920 struct vtnet_softc *sc; 2921 struct vtnet_txq *txq; 2922 struct mbuf *m; 2923 int i; 2924 2925 sc = ifp->if_softc; 2926 2927 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2928 txq = &sc->vtnet_txqs[i]; 2929 2930 VTNET_TXQ_LOCK(txq); 2931 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2932 m_freem(m); 2933 VTNET_TXQ_UNLOCK(txq); 2934 } 2935 2936 if_qflush(ifp); 2937 } 2938 #endif 2939 2940 static int 2941 vtnet_watchdog(struct vtnet_txq *txq) 2942 { 2943 struct ifnet *ifp; 2944 2945 ifp = txq->vtntx_sc->vtnet_ifp; 2946 2947 VTNET_TXQ_LOCK(txq); 2948 if (txq->vtntx_watchdog == 1) { 2949 /* 2950 * Only drain completed frames if the watchdog is about to 2951 * expire. If any frames were drained, there may be enough 2952 * free descriptors now available to transmit queued frames. 2953 * In that case, the timer will immediately be decremented 2954 * below, but the timeout is generous enough that should not 2955 * be a problem. 2956 */ 2957 if (vtnet_txq_eof(txq) != 0) 2958 vtnet_txq_start(txq); 2959 } 2960 2961 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2962 VTNET_TXQ_UNLOCK(txq); 2963 return (0); 2964 } 2965 VTNET_TXQ_UNLOCK(txq); 2966 2967 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2968 return (1); 2969 } 2970 2971 static void 2972 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2973 struct vtnet_txq_stats *txacc) 2974 { 2975 2976 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2977 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2978 2979 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2980 struct vtnet_rxq_stats *rxst; 2981 struct vtnet_txq_stats *txst; 2982 2983 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2984 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2985 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2986 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2987 rxacc->vrxs_csum += rxst->vrxs_csum; 2988 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2989 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2990 2991 txst = &sc->vtnet_txqs[i].vtntx_stats; 2992 txacc->vtxs_opackets += txst->vtxs_opackets; 2993 txacc->vtxs_obytes += txst->vtxs_obytes; 2994 txacc->vtxs_csum += txst->vtxs_csum; 2995 txacc->vtxs_tso += txst->vtxs_tso; 2996 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2997 } 2998 } 2999 3000 static uint64_t 3001 vtnet_get_counter(if_t ifp, ift_counter cnt) 3002 { 3003 struct vtnet_softc *sc; 3004 struct vtnet_rxq_stats rxaccum; 3005 struct vtnet_txq_stats txaccum; 3006 3007 sc = if_getsoftc(ifp); 3008 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3009 3010 switch (cnt) { 3011 case IFCOUNTER_IPACKETS: 3012 return (rxaccum.vrxs_ipackets); 3013 case IFCOUNTER_IQDROPS: 3014 return (rxaccum.vrxs_iqdrops); 3015 case IFCOUNTER_IERRORS: 3016 return (rxaccum.vrxs_ierrors); 3017 case IFCOUNTER_OPACKETS: 3018 return (txaccum.vtxs_opackets); 3019 #ifndef VTNET_LEGACY_TX 3020 case IFCOUNTER_OBYTES: 3021 return (txaccum.vtxs_obytes); 3022 case IFCOUNTER_OMCASTS: 3023 return (txaccum.vtxs_omcasts); 3024 #endif 3025 default: 3026 return (if_get_counter_default(ifp, cnt)); 3027 } 3028 } 3029 3030 static void 3031 vtnet_tick(void *xsc) 3032 { 3033 struct vtnet_softc *sc; 3034 struct ifnet *ifp; 3035 int i, timedout; 3036 3037 sc = xsc; 3038 ifp = sc->vtnet_ifp; 3039 timedout = 0; 3040 3041 VTNET_CORE_LOCK_ASSERT(sc); 3042 3043 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3044 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3045 3046 if (timedout != 0) { 3047 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3048 vtnet_init_locked(sc, 0); 3049 } else 3050 callout_schedule(&sc->vtnet_tick_ch, hz); 3051 } 3052 3053 static void 3054 vtnet_start_taskqueues(struct vtnet_softc *sc) 3055 { 3056 device_t dev; 3057 struct vtnet_rxq *rxq; 3058 struct vtnet_txq *txq; 3059 int i, error; 3060 3061 dev = sc->vtnet_dev; 3062 3063 /* 3064 * Errors here are very difficult to recover from - we cannot 3065 * easily fail because, if this is during boot, we will hang 3066 * when freeing any successfully started taskqueues because 3067 * the scheduler isn't up yet. 3068 * 3069 * Most drivers just ignore the return value - it only fails 3070 * with ENOMEM so an error is not likely. 3071 */ 3072 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3073 rxq = &sc->vtnet_rxqs[i]; 3074 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3075 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3076 if (error) { 3077 device_printf(dev, "failed to start rx taskq %d\n", 3078 rxq->vtnrx_id); 3079 } 3080 3081 txq = &sc->vtnet_txqs[i]; 3082 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3083 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3084 if (error) { 3085 device_printf(dev, "failed to start tx taskq %d\n", 3086 txq->vtntx_id); 3087 } 3088 } 3089 } 3090 3091 static void 3092 vtnet_free_taskqueues(struct vtnet_softc *sc) 3093 { 3094 struct vtnet_rxq *rxq; 3095 struct vtnet_txq *txq; 3096 int i; 3097 3098 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3099 rxq = &sc->vtnet_rxqs[i]; 3100 if (rxq->vtnrx_tq != NULL) { 3101 taskqueue_free(rxq->vtnrx_tq); 3102 rxq->vtnrx_tq = NULL; 3103 } 3104 3105 txq = &sc->vtnet_txqs[i]; 3106 if (txq->vtntx_tq != NULL) { 3107 taskqueue_free(txq->vtntx_tq); 3108 txq->vtntx_tq = NULL; 3109 } 3110 } 3111 } 3112 3113 static void 3114 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3115 { 3116 struct vtnet_rxq *rxq; 3117 struct vtnet_txq *txq; 3118 int i; 3119 3120 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3121 rxq = &sc->vtnet_rxqs[i]; 3122 if (rxq->vtnrx_tq != NULL) 3123 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3124 3125 txq = &sc->vtnet_txqs[i]; 3126 if (txq->vtntx_tq != NULL) { 3127 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3128 #ifndef VTNET_LEGACY_TX 3129 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3130 #endif 3131 } 3132 } 3133 } 3134 3135 static void 3136 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3137 { 3138 struct vtnet_rxq *rxq; 3139 struct vtnet_txq *txq; 3140 int i; 3141 3142 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3143 rxq = &sc->vtnet_rxqs[i]; 3144 vtnet_rxq_free_mbufs(rxq); 3145 3146 txq = &sc->vtnet_txqs[i]; 3147 vtnet_txq_free_mbufs(txq); 3148 } 3149 } 3150 3151 static void 3152 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3153 { 3154 struct vtnet_rxq *rxq; 3155 struct vtnet_txq *txq; 3156 int i; 3157 3158 VTNET_CORE_LOCK_ASSERT(sc); 3159 3160 /* 3161 * Lock and unlock the per-queue mutex so we known the stop 3162 * state is visible. Doing only the active queues should be 3163 * sufficient, but it does not cost much extra to do all the 3164 * queues. 3165 */ 3166 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3167 rxq = &sc->vtnet_rxqs[i]; 3168 VTNET_RXQ_LOCK(rxq); 3169 VTNET_RXQ_UNLOCK(rxq); 3170 3171 txq = &sc->vtnet_txqs[i]; 3172 VTNET_TXQ_LOCK(txq); 3173 VTNET_TXQ_UNLOCK(txq); 3174 } 3175 } 3176 3177 static void 3178 vtnet_stop(struct vtnet_softc *sc) 3179 { 3180 device_t dev; 3181 struct ifnet *ifp; 3182 3183 dev = sc->vtnet_dev; 3184 ifp = sc->vtnet_ifp; 3185 3186 VTNET_CORE_LOCK_ASSERT(sc); 3187 3188 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3189 sc->vtnet_link_active = 0; 3190 callout_stop(&sc->vtnet_tick_ch); 3191 3192 /* Only advisory. */ 3193 vtnet_disable_interrupts(sc); 3194 3195 #ifdef DEV_NETMAP 3196 /* Stop any pending txsync/rxsync and disable them. */ 3197 netmap_disable_all_rings(ifp); 3198 #endif /* DEV_NETMAP */ 3199 3200 /* 3201 * Stop the host adapter. This resets it to the pre-initialized 3202 * state. It will not generate any interrupts until after it is 3203 * reinitialized. 3204 */ 3205 virtio_stop(dev); 3206 vtnet_stop_rendezvous(sc); 3207 3208 vtnet_drain_rxtx_queues(sc); 3209 sc->vtnet_act_vq_pairs = 1; 3210 } 3211 3212 static int 3213 vtnet_virtio_reinit(struct vtnet_softc *sc) 3214 { 3215 device_t dev; 3216 struct ifnet *ifp; 3217 uint64_t features; 3218 int error; 3219 3220 dev = sc->vtnet_dev; 3221 ifp = sc->vtnet_ifp; 3222 features = sc->vtnet_negotiated_features; 3223 3224 /* 3225 * Re-negotiate with the host, removing any disabled receive 3226 * features. Transmit features are disabled only on our side 3227 * via if_capenable and if_hwassist. 3228 */ 3229 3230 if ((ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3231 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3232 3233 if ((ifp->if_capenable & IFCAP_LRO) == 0) 3234 features &= ~VTNET_LRO_FEATURES; 3235 3236 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 3237 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3238 3239 error = virtio_reinit(dev, features); 3240 if (error) { 3241 device_printf(dev, "virtio reinit error %d\n", error); 3242 return (error); 3243 } 3244 3245 sc->vtnet_features = features; 3246 virtio_reinit_complete(dev); 3247 3248 return (0); 3249 } 3250 3251 static void 3252 vtnet_init_rx_filters(struct vtnet_softc *sc) 3253 { 3254 struct ifnet *ifp; 3255 3256 ifp = sc->vtnet_ifp; 3257 3258 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3259 vtnet_rx_filter(sc); 3260 vtnet_rx_filter_mac(sc); 3261 } 3262 3263 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 3264 vtnet_rx_filter_vlan(sc); 3265 } 3266 3267 static int 3268 vtnet_init_rx_queues(struct vtnet_softc *sc) 3269 { 3270 device_t dev; 3271 struct ifnet *ifp; 3272 struct vtnet_rxq *rxq; 3273 int i, clustersz, error; 3274 3275 dev = sc->vtnet_dev; 3276 ifp = sc->vtnet_ifp; 3277 3278 clustersz = vtnet_rx_cluster_size(sc, ifp->if_mtu); 3279 sc->vtnet_rx_clustersz = clustersz; 3280 3281 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3282 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3283 VTNET_MAX_RX_SIZE, clustersz); 3284 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3285 ("%s: too many rx mbufs %d for %d segments", __func__, 3286 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3287 } else 3288 sc->vtnet_rx_nmbufs = 1; 3289 3290 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3291 rxq = &sc->vtnet_rxqs[i]; 3292 3293 /* Hold the lock to satisfy asserts. */ 3294 VTNET_RXQ_LOCK(rxq); 3295 error = vtnet_rxq_populate(rxq); 3296 VTNET_RXQ_UNLOCK(rxq); 3297 3298 if (error) { 3299 device_printf(dev, "cannot populate Rx queue %d\n", i); 3300 return (error); 3301 } 3302 } 3303 3304 return (0); 3305 } 3306 3307 static int 3308 vtnet_init_tx_queues(struct vtnet_softc *sc) 3309 { 3310 struct vtnet_txq *txq; 3311 int i; 3312 3313 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3314 txq = &sc->vtnet_txqs[i]; 3315 txq->vtntx_watchdog = 0; 3316 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3317 #ifdef DEV_NETMAP 3318 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3319 #endif /* DEV_NETMAP */ 3320 } 3321 3322 return (0); 3323 } 3324 3325 static int 3326 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3327 { 3328 int error; 3329 3330 error = vtnet_init_rx_queues(sc); 3331 if (error) 3332 return (error); 3333 3334 error = vtnet_init_tx_queues(sc); 3335 if (error) 3336 return (error); 3337 3338 return (0); 3339 } 3340 3341 static void 3342 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3343 { 3344 device_t dev; 3345 int npairs; 3346 3347 dev = sc->vtnet_dev; 3348 3349 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3350 sc->vtnet_act_vq_pairs = 1; 3351 return; 3352 } 3353 3354 npairs = sc->vtnet_req_vq_pairs; 3355 3356 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3357 device_printf(dev, "cannot set active queue pairs to %d, " 3358 "falling back to 1 queue pair\n", npairs); 3359 npairs = 1; 3360 } 3361 3362 sc->vtnet_act_vq_pairs = npairs; 3363 } 3364 3365 static void 3366 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3367 { 3368 struct ifnet *ifp; 3369 uint64_t features; 3370 int error; 3371 3372 ifp = sc->vtnet_ifp; 3373 features = sc->vtnet_features; 3374 3375 VTNET_CORE_LOCK_ASSERT(sc); 3376 3377 if (ifp->if_capabilities & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3378 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3379 features |= VIRTIO_NET_F_GUEST_CSUM; 3380 else 3381 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3382 } 3383 3384 if (ifp->if_capabilities & IFCAP_LRO && !vtnet_software_lro(sc)) { 3385 if (ifp->if_capenable & IFCAP_LRO) 3386 features |= VTNET_LRO_FEATURES; 3387 else 3388 features &= ~VTNET_LRO_FEATURES; 3389 } 3390 3391 error = vtnet_ctrl_guest_offloads(sc, 3392 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3393 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3394 VIRTIO_NET_F_GUEST_UFO)); 3395 if (error) { 3396 device_printf(sc->vtnet_dev, 3397 "%s: cannot update Rx features\n", __func__); 3398 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 3399 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 3400 vtnet_init_locked(sc, 0); 3401 } 3402 } else 3403 sc->vtnet_features = features; 3404 } 3405 3406 static int 3407 vtnet_reinit(struct vtnet_softc *sc) 3408 { 3409 struct ifnet *ifp; 3410 int error; 3411 3412 ifp = sc->vtnet_ifp; 3413 3414 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3415 3416 error = vtnet_virtio_reinit(sc); 3417 if (error) 3418 return (error); 3419 3420 vtnet_set_macaddr(sc); 3421 vtnet_set_active_vq_pairs(sc); 3422 3423 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3424 vtnet_init_rx_filters(sc); 3425 3426 ifp->if_hwassist = 0; 3427 if (ifp->if_capenable & IFCAP_TXCSUM) 3428 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 3429 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 3430 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6; 3431 if (ifp->if_capenable & IFCAP_TSO4) 3432 ifp->if_hwassist |= CSUM_IP_TSO; 3433 if (ifp->if_capenable & IFCAP_TSO6) 3434 ifp->if_hwassist |= CSUM_IP6_TSO; 3435 3436 error = vtnet_init_rxtx_queues(sc); 3437 if (error) 3438 return (error); 3439 3440 return (0); 3441 } 3442 3443 static void 3444 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3445 { 3446 struct ifnet *ifp; 3447 3448 ifp = sc->vtnet_ifp; 3449 3450 VTNET_CORE_LOCK_ASSERT(sc); 3451 3452 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 3453 return; 3454 3455 vtnet_stop(sc); 3456 3457 #ifdef DEV_NETMAP 3458 /* Once stopped we can update the netmap flags, if necessary. */ 3459 switch (init_mode) { 3460 case VTNET_INIT_NETMAP_ENTER: 3461 nm_set_native_flags(NA(ifp)); 3462 break; 3463 case VTNET_INIT_NETMAP_EXIT: 3464 nm_clear_native_flags(NA(ifp)); 3465 break; 3466 } 3467 #endif /* DEV_NETMAP */ 3468 3469 if (vtnet_reinit(sc) != 0) { 3470 vtnet_stop(sc); 3471 return; 3472 } 3473 3474 ifp->if_drv_flags |= IFF_DRV_RUNNING; 3475 vtnet_update_link_status(sc); 3476 vtnet_enable_interrupts(sc); 3477 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3478 3479 #ifdef DEV_NETMAP 3480 /* Re-enable txsync/rxsync. */ 3481 netmap_enable_all_rings(ifp); 3482 #endif /* DEV_NETMAP */ 3483 } 3484 3485 static void 3486 vtnet_init(void *xsc) 3487 { 3488 struct vtnet_softc *sc; 3489 3490 sc = xsc; 3491 3492 VTNET_CORE_LOCK(sc); 3493 vtnet_init_locked(sc, 0); 3494 VTNET_CORE_UNLOCK(sc); 3495 } 3496 3497 static void 3498 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3499 { 3500 3501 /* 3502 * The control virtqueue is only polled and therefore it should 3503 * already be empty. 3504 */ 3505 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3506 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3507 } 3508 3509 static void 3510 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3511 struct sglist *sg, int readable, int writable) 3512 { 3513 struct virtqueue *vq; 3514 3515 vq = sc->vtnet_ctrl_vq; 3516 3517 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3518 VTNET_CORE_LOCK_ASSERT(sc); 3519 3520 if (!virtqueue_empty(vq)) 3521 return; 3522 3523 /* 3524 * Poll for the response, but the command is likely completed before 3525 * returning from the notify. 3526 */ 3527 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3528 virtqueue_notify(vq); 3529 virtqueue_poll(vq, NULL); 3530 } 3531 } 3532 3533 static int 3534 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3535 { 3536 struct sglist_seg segs[3]; 3537 struct sglist sg; 3538 struct { 3539 struct virtio_net_ctrl_hdr hdr __aligned(2); 3540 uint8_t pad1; 3541 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3542 uint8_t pad2; 3543 uint8_t ack; 3544 } s; 3545 int error; 3546 3547 error = 0; 3548 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3549 3550 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3551 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3552 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3553 s.ack = VIRTIO_NET_ERR; 3554 3555 sglist_init(&sg, nitems(segs), segs); 3556 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3557 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3558 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3559 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3560 3561 if (error == 0) 3562 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3563 3564 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3565 } 3566 3567 static int 3568 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3569 { 3570 struct sglist_seg segs[3]; 3571 struct sglist sg; 3572 struct { 3573 struct virtio_net_ctrl_hdr hdr __aligned(2); 3574 uint8_t pad1; 3575 uint64_t offloads __aligned(8); 3576 uint8_t pad2; 3577 uint8_t ack; 3578 } s; 3579 int error; 3580 3581 error = 0; 3582 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3583 3584 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3585 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3586 s.offloads = vtnet_gtoh64(sc, offloads); 3587 s.ack = VIRTIO_NET_ERR; 3588 3589 sglist_init(&sg, nitems(segs), segs); 3590 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3591 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3592 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3593 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3594 3595 if (error == 0) 3596 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3597 3598 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3599 } 3600 3601 static int 3602 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3603 { 3604 struct sglist_seg segs[3]; 3605 struct sglist sg; 3606 struct { 3607 struct virtio_net_ctrl_hdr hdr __aligned(2); 3608 uint8_t pad1; 3609 struct virtio_net_ctrl_mq mq __aligned(2); 3610 uint8_t pad2; 3611 uint8_t ack; 3612 } s; 3613 int error; 3614 3615 error = 0; 3616 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3617 3618 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3619 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3620 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3621 s.ack = VIRTIO_NET_ERR; 3622 3623 sglist_init(&sg, nitems(segs), segs); 3624 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3625 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3626 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3627 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3628 3629 if (error == 0) 3630 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3631 3632 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3633 } 3634 3635 static int 3636 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3637 { 3638 struct sglist_seg segs[3]; 3639 struct sglist sg; 3640 struct { 3641 struct virtio_net_ctrl_hdr hdr __aligned(2); 3642 uint8_t pad1; 3643 uint8_t onoff; 3644 uint8_t pad2; 3645 uint8_t ack; 3646 } s; 3647 int error; 3648 3649 error = 0; 3650 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3651 3652 s.hdr.class = VIRTIO_NET_CTRL_RX; 3653 s.hdr.cmd = cmd; 3654 s.onoff = on; 3655 s.ack = VIRTIO_NET_ERR; 3656 3657 sglist_init(&sg, nitems(segs), segs); 3658 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3659 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3660 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3661 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3662 3663 if (error == 0) 3664 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3665 3666 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3667 } 3668 3669 static int 3670 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3671 { 3672 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3673 } 3674 3675 static int 3676 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3677 { 3678 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3679 } 3680 3681 static void 3682 vtnet_rx_filter(struct vtnet_softc *sc) 3683 { 3684 device_t dev; 3685 struct ifnet *ifp; 3686 3687 dev = sc->vtnet_dev; 3688 ifp = sc->vtnet_ifp; 3689 3690 VTNET_CORE_LOCK_ASSERT(sc); 3691 3692 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) { 3693 device_printf(dev, "cannot %s promiscuous mode\n", 3694 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 3695 } 3696 3697 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) { 3698 device_printf(dev, "cannot %s all-multicast mode\n", 3699 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 3700 } 3701 } 3702 3703 static u_int 3704 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3705 { 3706 struct vtnet_softc *sc = arg; 3707 3708 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3709 return (0); 3710 3711 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3712 bcopy(LLADDR(sdl), 3713 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3714 ETHER_ADDR_LEN); 3715 3716 return (1); 3717 } 3718 3719 static u_int 3720 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3721 { 3722 struct vtnet_mac_filter *filter = arg; 3723 3724 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3725 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3726 ETHER_ADDR_LEN); 3727 3728 return (1); 3729 } 3730 3731 static void 3732 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3733 { 3734 struct virtio_net_ctrl_hdr hdr __aligned(2); 3735 struct vtnet_mac_filter *filter; 3736 struct sglist_seg segs[4]; 3737 struct sglist sg; 3738 struct ifnet *ifp; 3739 bool promisc, allmulti; 3740 u_int ucnt, mcnt; 3741 int error; 3742 uint8_t ack; 3743 3744 ifp = sc->vtnet_ifp; 3745 filter = sc->vtnet_mac_filter; 3746 error = 0; 3747 3748 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3749 VTNET_CORE_LOCK_ASSERT(sc); 3750 3751 /* Unicast MAC addresses: */ 3752 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3753 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3754 3755 if (promisc) { 3756 ucnt = 0; 3757 if_printf(ifp, "more than %d MAC addresses assigned, " 3758 "falling back to promiscuous mode\n", 3759 VTNET_MAX_MAC_ENTRIES); 3760 } 3761 3762 /* Multicast MAC addresses: */ 3763 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3764 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3765 3766 if (allmulti) { 3767 mcnt = 0; 3768 if_printf(ifp, "more than %d multicast MAC addresses " 3769 "assigned, falling back to all-multicast mode\n", 3770 VTNET_MAX_MAC_ENTRIES); 3771 } 3772 3773 if (promisc && allmulti) 3774 goto out; 3775 3776 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3777 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3778 3779 hdr.class = VIRTIO_NET_CTRL_MAC; 3780 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3781 ack = VIRTIO_NET_ERR; 3782 3783 sglist_init(&sg, nitems(segs), segs); 3784 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3785 error |= sglist_append(&sg, &filter->vmf_unicast, 3786 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3787 error |= sglist_append(&sg, &filter->vmf_multicast, 3788 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3789 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3790 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3791 3792 if (error == 0) 3793 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3794 if (ack != VIRTIO_NET_OK) 3795 if_printf(ifp, "error setting host MAC filter table\n"); 3796 3797 out: 3798 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3799 if_printf(ifp, "cannot enable promiscuous mode\n"); 3800 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3801 if_printf(ifp, "cannot enable all-multicast mode\n"); 3802 } 3803 3804 static int 3805 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3806 { 3807 struct sglist_seg segs[3]; 3808 struct sglist sg; 3809 struct { 3810 struct virtio_net_ctrl_hdr hdr __aligned(2); 3811 uint8_t pad1; 3812 uint16_t tag __aligned(2); 3813 uint8_t pad2; 3814 uint8_t ack; 3815 } s; 3816 int error; 3817 3818 error = 0; 3819 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3820 3821 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3822 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3823 s.tag = vtnet_gtoh16(sc, tag); 3824 s.ack = VIRTIO_NET_ERR; 3825 3826 sglist_init(&sg, nitems(segs), segs); 3827 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3828 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3829 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3830 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3831 3832 if (error == 0) 3833 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3834 3835 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3836 } 3837 3838 static void 3839 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3840 { 3841 int i, bit; 3842 uint32_t w; 3843 uint16_t tag; 3844 3845 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3846 VTNET_CORE_LOCK_ASSERT(sc); 3847 3848 /* Enable the filter for each configured VLAN. */ 3849 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3850 w = sc->vtnet_vlan_filter[i]; 3851 3852 while ((bit = ffs(w) - 1) != -1) { 3853 w &= ~(1 << bit); 3854 tag = sizeof(w) * CHAR_BIT * i + bit; 3855 3856 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3857 device_printf(sc->vtnet_dev, 3858 "cannot enable VLAN %d filter\n", tag); 3859 } 3860 } 3861 } 3862 } 3863 3864 static void 3865 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3866 { 3867 struct ifnet *ifp; 3868 int idx, bit; 3869 3870 ifp = sc->vtnet_ifp; 3871 idx = (tag >> 5) & 0x7F; 3872 bit = tag & 0x1F; 3873 3874 if (tag == 0 || tag > 4095) 3875 return; 3876 3877 VTNET_CORE_LOCK(sc); 3878 3879 if (add) 3880 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3881 else 3882 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3883 3884 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER && 3885 ifp->if_drv_flags & IFF_DRV_RUNNING && 3886 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3887 device_printf(sc->vtnet_dev, 3888 "cannot %s VLAN %d %s the host filter table\n", 3889 add ? "add" : "remove", tag, add ? "to" : "from"); 3890 } 3891 3892 VTNET_CORE_UNLOCK(sc); 3893 } 3894 3895 static void 3896 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3897 { 3898 3899 if (ifp->if_softc != arg) 3900 return; 3901 3902 vtnet_update_vlan_filter(arg, 1, tag); 3903 } 3904 3905 static void 3906 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 3907 { 3908 3909 if (ifp->if_softc != arg) 3910 return; 3911 3912 vtnet_update_vlan_filter(arg, 0, tag); 3913 } 3914 3915 static void 3916 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3917 { 3918 struct ifnet *ifp; 3919 uint32_t speed; 3920 3921 ifp = sc->vtnet_ifp; 3922 3923 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3924 return; 3925 3926 /* BMV: Ignore duplex. */ 3927 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3928 offsetof(struct virtio_net_config, speed)); 3929 if (speed != UINT32_MAX) 3930 ifp->if_baudrate = IF_Mbps(speed); 3931 } 3932 3933 static int 3934 vtnet_is_link_up(struct vtnet_softc *sc) 3935 { 3936 uint16_t status; 3937 3938 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3939 return (1); 3940 3941 status = virtio_read_dev_config_2(sc->vtnet_dev, 3942 offsetof(struct virtio_net_config, status)); 3943 3944 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3945 } 3946 3947 static void 3948 vtnet_update_link_status(struct vtnet_softc *sc) 3949 { 3950 struct ifnet *ifp; 3951 int link; 3952 3953 ifp = sc->vtnet_ifp; 3954 VTNET_CORE_LOCK_ASSERT(sc); 3955 link = vtnet_is_link_up(sc); 3956 3957 /* Notify if the link status has changed. */ 3958 if (link != 0 && sc->vtnet_link_active == 0) { 3959 vtnet_update_speed_duplex(sc); 3960 sc->vtnet_link_active = 1; 3961 if_link_state_change(ifp, LINK_STATE_UP); 3962 } else if (link == 0 && sc->vtnet_link_active != 0) { 3963 sc->vtnet_link_active = 0; 3964 if_link_state_change(ifp, LINK_STATE_DOWN); 3965 } 3966 } 3967 3968 static int 3969 vtnet_ifmedia_upd(struct ifnet *ifp __unused) 3970 { 3971 return (EOPNOTSUPP); 3972 } 3973 3974 static void 3975 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 3976 { 3977 struct vtnet_softc *sc; 3978 3979 sc = ifp->if_softc; 3980 3981 ifmr->ifm_status = IFM_AVALID; 3982 ifmr->ifm_active = IFM_ETHER; 3983 3984 VTNET_CORE_LOCK(sc); 3985 if (vtnet_is_link_up(sc) != 0) { 3986 ifmr->ifm_status |= IFM_ACTIVE; 3987 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3988 } else 3989 ifmr->ifm_active |= IFM_NONE; 3990 VTNET_CORE_UNLOCK(sc); 3991 } 3992 3993 static void 3994 vtnet_get_macaddr(struct vtnet_softc *sc) 3995 { 3996 3997 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3998 virtio_read_device_config_array(sc->vtnet_dev, 3999 offsetof(struct virtio_net_config, mac), 4000 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4001 } else { 4002 /* Generate a random locally administered unicast address. */ 4003 sc->vtnet_hwaddr[0] = 0xB2; 4004 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4005 } 4006 } 4007 4008 static void 4009 vtnet_set_macaddr(struct vtnet_softc *sc) 4010 { 4011 device_t dev; 4012 int error; 4013 4014 dev = sc->vtnet_dev; 4015 4016 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4017 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4018 if (error) 4019 device_printf(dev, "unable to set MAC address\n"); 4020 return; 4021 } 4022 4023 /* MAC in config is read-only in modern VirtIO. */ 4024 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4025 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4026 virtio_write_dev_config_1(dev, 4027 offsetof(struct virtio_net_config, mac) + i, 4028 sc->vtnet_hwaddr[i]); 4029 } 4030 } 4031 } 4032 4033 static void 4034 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4035 { 4036 4037 /* Assign MAC address if it was generated. */ 4038 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4039 vtnet_set_macaddr(sc); 4040 } 4041 4042 static void 4043 vtnet_vlan_tag_remove(struct mbuf *m) 4044 { 4045 struct ether_vlan_header *evh; 4046 4047 evh = mtod(m, struct ether_vlan_header *); 4048 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4049 m->m_flags |= M_VLANTAG; 4050 4051 /* Strip the 802.1Q header. */ 4052 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4053 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4054 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4055 } 4056 4057 static void 4058 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4059 { 4060 int limit; 4061 4062 limit = vtnet_tunable_int(sc, "rx_process_limit", 4063 vtnet_rx_process_limit); 4064 if (limit < 0) 4065 limit = INT_MAX; 4066 sc->vtnet_rx_process_limit = limit; 4067 } 4068 4069 static void 4070 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4071 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4072 { 4073 struct sysctl_oid *node; 4074 struct sysctl_oid_list *list; 4075 struct vtnet_rxq_stats *stats; 4076 char namebuf[16]; 4077 4078 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4079 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4080 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4081 list = SYSCTL_CHILDREN(node); 4082 4083 stats = &rxq->vtnrx_stats; 4084 4085 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4086 &stats->vrxs_ipackets, "Receive packets"); 4087 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4088 &stats->vrxs_ibytes, "Receive bytes"); 4089 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4090 &stats->vrxs_iqdrops, "Receive drops"); 4091 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4092 &stats->vrxs_ierrors, "Receive errors"); 4093 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4094 &stats->vrxs_csum, "Receive checksum offloaded"); 4095 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4096 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4097 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4098 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4099 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4100 &stats->vrxs_rescheduled, 4101 "Receive interrupt handler rescheduled"); 4102 } 4103 4104 static void 4105 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4106 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4107 { 4108 struct sysctl_oid *node; 4109 struct sysctl_oid_list *list; 4110 struct vtnet_txq_stats *stats; 4111 char namebuf[16]; 4112 4113 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4114 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4115 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4116 list = SYSCTL_CHILDREN(node); 4117 4118 stats = &txq->vtntx_stats; 4119 4120 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4121 &stats->vtxs_opackets, "Transmit packets"); 4122 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4123 &stats->vtxs_obytes, "Transmit bytes"); 4124 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4125 &stats->vtxs_omcasts, "Transmit multicasts"); 4126 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4127 &stats->vtxs_csum, "Transmit checksum offloaded"); 4128 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4129 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4130 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4131 &stats->vtxs_rescheduled, 4132 "Transmit interrupt handler rescheduled"); 4133 } 4134 4135 static void 4136 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4137 { 4138 device_t dev; 4139 struct sysctl_ctx_list *ctx; 4140 struct sysctl_oid *tree; 4141 struct sysctl_oid_list *child; 4142 int i; 4143 4144 dev = sc->vtnet_dev; 4145 ctx = device_get_sysctl_ctx(dev); 4146 tree = device_get_sysctl_tree(dev); 4147 child = SYSCTL_CHILDREN(tree); 4148 4149 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4150 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4151 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4152 } 4153 } 4154 4155 static void 4156 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4157 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4158 { 4159 struct vtnet_statistics *stats; 4160 struct vtnet_rxq_stats rxaccum; 4161 struct vtnet_txq_stats txaccum; 4162 4163 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4164 4165 stats = &sc->vtnet_stats; 4166 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4167 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4168 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4169 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4170 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4171 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4172 4173 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4174 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4175 "Mbuf cluster allocation failures"); 4176 4177 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4178 CTLFLAG_RD, &stats->rx_frame_too_large, 4179 "Received frame larger than the mbuf chain"); 4180 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4181 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4182 "Enqueuing the replacement receive mbuf failed"); 4183 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4184 CTLFLAG_RD, &stats->rx_mergeable_failed, 4185 "Mergeable buffers receive failures"); 4186 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4187 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4188 "Received checksum offloaded buffer with unsupported " 4189 "Ethernet type"); 4190 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4191 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4192 "Received checksum offloaded buffer with incorrect IP protocol"); 4193 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4194 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4195 "Received checksum offloaded buffer with incorrect offset"); 4196 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4197 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4198 "Received checksum offloaded buffer with incorrect protocol"); 4199 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4200 CTLFLAG_RD, &stats->rx_csum_failed, 4201 "Received buffer checksum offload failed"); 4202 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4203 CTLFLAG_RD, &stats->rx_csum_offloaded, 4204 "Received buffer checksum offload succeeded"); 4205 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4206 CTLFLAG_RD, &stats->rx_task_rescheduled, 4207 "Times the receive interrupt task rescheduled itself"); 4208 4209 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4210 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4211 "Aborted transmit of checksum offloaded buffer with unknown " 4212 "Ethernet type"); 4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4214 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4215 "Aborted transmit of checksum offloaded buffer because mismatched " 4216 "protocols"); 4217 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4218 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4219 "Aborted transmit of TSO buffer with non TCP protocol"); 4220 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4221 CTLFLAG_RD, &stats->tx_tso_without_csum, 4222 "Aborted transmit of TSO buffer without TCP checksum offload"); 4223 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4224 CTLFLAG_RD, &stats->tx_defragged, 4225 "Transmit mbufs defragged"); 4226 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4227 CTLFLAG_RD, &stats->tx_defrag_failed, 4228 "Aborted transmit of buffer because defrag failed"); 4229 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4230 CTLFLAG_RD, &stats->tx_csum_offloaded, 4231 "Offloaded checksum of transmitted buffer"); 4232 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4233 CTLFLAG_RD, &stats->tx_tso_offloaded, 4234 "Segmentation offload of transmitted buffer"); 4235 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4236 CTLFLAG_RD, &stats->tx_task_rescheduled, 4237 "Times the transmit interrupt task rescheduled itself"); 4238 } 4239 4240 static void 4241 vtnet_setup_sysctl(struct vtnet_softc *sc) 4242 { 4243 device_t dev; 4244 struct sysctl_ctx_list *ctx; 4245 struct sysctl_oid *tree; 4246 struct sysctl_oid_list *child; 4247 4248 dev = sc->vtnet_dev; 4249 ctx = device_get_sysctl_ctx(dev); 4250 tree = device_get_sysctl_tree(dev); 4251 child = SYSCTL_CHILDREN(tree); 4252 4253 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4254 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4255 "Number of maximum supported virtqueue pairs"); 4256 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4257 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4258 "Number of requested virtqueue pairs"); 4259 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4260 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4261 "Number of active virtqueue pairs"); 4262 4263 vtnet_setup_stat_sysctl(ctx, child, sc); 4264 } 4265 4266 static void 4267 vtnet_load_tunables(struct vtnet_softc *sc) 4268 { 4269 4270 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4271 "lro_entry_count", vtnet_lro_entry_count); 4272 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4273 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4274 4275 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4276 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4277 } 4278 4279 static int 4280 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4281 { 4282 4283 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4284 } 4285 4286 static void 4287 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4288 { 4289 4290 virtqueue_disable_intr(rxq->vtnrx_vq); 4291 } 4292 4293 static int 4294 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4295 { 4296 struct virtqueue *vq; 4297 4298 vq = txq->vtntx_vq; 4299 4300 if (vtnet_txq_below_threshold(txq) != 0) 4301 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4302 4303 /* 4304 * The free count is above our threshold. Keep the Tx interrupt 4305 * disabled until the queue is fuller. 4306 */ 4307 return (0); 4308 } 4309 4310 static void 4311 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4312 { 4313 4314 virtqueue_disable_intr(txq->vtntx_vq); 4315 } 4316 4317 static void 4318 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4319 { 4320 struct vtnet_rxq *rxq; 4321 int i; 4322 4323 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4324 rxq = &sc->vtnet_rxqs[i]; 4325 if (vtnet_rxq_enable_intr(rxq) != 0) 4326 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4327 } 4328 } 4329 4330 static void 4331 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4332 { 4333 int i; 4334 4335 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4336 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4337 } 4338 4339 static void 4340 vtnet_enable_interrupts(struct vtnet_softc *sc) 4341 { 4342 4343 vtnet_enable_rx_interrupts(sc); 4344 vtnet_enable_tx_interrupts(sc); 4345 } 4346 4347 static void 4348 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4349 { 4350 int i; 4351 4352 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4353 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4354 } 4355 4356 static void 4357 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4358 { 4359 int i; 4360 4361 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4362 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4363 } 4364 4365 static void 4366 vtnet_disable_interrupts(struct vtnet_softc *sc) 4367 { 4368 4369 vtnet_disable_rx_interrupts(sc); 4370 vtnet_disable_tx_interrupts(sc); 4371 } 4372 4373 static int 4374 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4375 { 4376 char path[64]; 4377 4378 snprintf(path, sizeof(path), 4379 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4380 TUNABLE_INT_FETCH(path, &def); 4381 4382 return (def); 4383 } 4384 4385 #ifdef DEBUGNET 4386 static void 4387 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize) 4388 { 4389 struct vtnet_softc *sc; 4390 4391 sc = if_getsoftc(ifp); 4392 4393 VTNET_CORE_LOCK(sc); 4394 *nrxr = sc->vtnet_req_vq_pairs; 4395 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4396 *clsize = sc->vtnet_rx_clustersz; 4397 VTNET_CORE_UNLOCK(sc); 4398 } 4399 4400 static void 4401 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused) 4402 { 4403 } 4404 4405 static int 4406 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m) 4407 { 4408 struct vtnet_softc *sc; 4409 struct vtnet_txq *txq; 4410 int error; 4411 4412 sc = if_getsoftc(ifp); 4413 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4414 IFF_DRV_RUNNING) 4415 return (EBUSY); 4416 4417 txq = &sc->vtnet_txqs[0]; 4418 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4419 if (error == 0) 4420 (void)vtnet_txq_notify(txq); 4421 return (error); 4422 } 4423 4424 static int 4425 vtnet_debugnet_poll(struct ifnet *ifp, int count) 4426 { 4427 struct vtnet_softc *sc; 4428 int i; 4429 4430 sc = if_getsoftc(ifp); 4431 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4432 IFF_DRV_RUNNING) 4433 return (EBUSY); 4434 4435 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4436 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4437 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4438 return (0); 4439 } 4440 #endif /* DEBUGNET */ 4441