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(if_t, u_long, caddr_t); 122 static uint64_t vtnet_get_counter(if_t, 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 *, if_t); 165 static void vtnet_start(if_t); 166 #else 167 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 168 static int vtnet_txq_mq_start(if_t, 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(if_t); 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 *, if_t, uint16_t); 219 static void vtnet_unregister_vlan(void *, if_t, 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(if_t); 225 static void vtnet_ifmedia_sts(if_t, 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 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 365 MODULE_VERSION(vtnet, 1); 366 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 367 #ifdef DEV_NETMAP 368 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 369 #endif 370 371 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 372 373 static int 374 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 375 { 376 int error = 0; 377 static int loaded = 0; 378 379 switch (type) { 380 case MOD_LOAD: 381 if (loaded++ == 0) { 382 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 383 sizeof(struct vtnet_tx_header), 384 NULL, NULL, NULL, NULL, 0, 0); 385 #ifdef DEBUGNET 386 /* 387 * We need to allocate from this zone in the transmit path, so ensure 388 * that we have at least one item per header available. 389 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 390 * buckets 391 */ 392 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 393 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 394 #endif 395 } 396 break; 397 case MOD_QUIESCE: 398 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 399 error = EBUSY; 400 break; 401 case MOD_UNLOAD: 402 if (--loaded == 0) { 403 uma_zdestroy(vtnet_tx_header_zone); 404 vtnet_tx_header_zone = NULL; 405 } 406 break; 407 case MOD_SHUTDOWN: 408 break; 409 default: 410 error = EOPNOTSUPP; 411 break; 412 } 413 414 return (error); 415 } 416 417 static int 418 vtnet_probe(device_t dev) 419 { 420 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 421 } 422 423 static int 424 vtnet_attach(device_t dev) 425 { 426 struct vtnet_softc *sc; 427 int error; 428 429 sc = device_get_softc(dev); 430 sc->vtnet_dev = dev; 431 virtio_set_feature_desc(dev, vtnet_feature_desc); 432 433 VTNET_CORE_LOCK_INIT(sc); 434 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 435 vtnet_load_tunables(sc); 436 437 error = vtnet_alloc_interface(sc); 438 if (error) { 439 device_printf(dev, "cannot allocate interface\n"); 440 goto fail; 441 } 442 443 vtnet_setup_sysctl(sc); 444 445 error = vtnet_setup_features(sc); 446 if (error) { 447 device_printf(dev, "cannot setup features\n"); 448 goto fail; 449 } 450 451 error = vtnet_alloc_rx_filters(sc); 452 if (error) { 453 device_printf(dev, "cannot allocate Rx filters\n"); 454 goto fail; 455 } 456 457 error = vtnet_alloc_rxtx_queues(sc); 458 if (error) { 459 device_printf(dev, "cannot allocate queues\n"); 460 goto fail; 461 } 462 463 error = vtnet_alloc_virtqueues(sc); 464 if (error) { 465 device_printf(dev, "cannot allocate virtqueues\n"); 466 goto fail; 467 } 468 469 error = vtnet_setup_interface(sc); 470 if (error) { 471 device_printf(dev, "cannot setup interface\n"); 472 goto fail; 473 } 474 475 error = virtio_setup_intr(dev, INTR_TYPE_NET); 476 if (error) { 477 device_printf(dev, "cannot setup interrupts\n"); 478 ether_ifdetach(sc->vtnet_ifp); 479 goto fail; 480 } 481 482 #ifdef DEV_NETMAP 483 vtnet_netmap_attach(sc); 484 #endif 485 vtnet_start_taskqueues(sc); 486 487 fail: 488 if (error) 489 vtnet_detach(dev); 490 491 return (error); 492 } 493 494 static int 495 vtnet_detach(device_t dev) 496 { 497 struct vtnet_softc *sc; 498 if_t ifp; 499 500 sc = device_get_softc(dev); 501 ifp = sc->vtnet_ifp; 502 503 if (device_is_attached(dev)) { 504 VTNET_CORE_LOCK(sc); 505 vtnet_stop(sc); 506 VTNET_CORE_UNLOCK(sc); 507 508 callout_drain(&sc->vtnet_tick_ch); 509 vtnet_drain_taskqueues(sc); 510 511 ether_ifdetach(ifp); 512 } 513 514 #ifdef DEV_NETMAP 515 netmap_detach(ifp); 516 #endif 517 518 if (sc->vtnet_pfil != NULL) { 519 pfil_head_unregister(sc->vtnet_pfil); 520 sc->vtnet_pfil = NULL; 521 } 522 523 vtnet_free_taskqueues(sc); 524 525 if (sc->vtnet_vlan_attach != NULL) { 526 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 527 sc->vtnet_vlan_attach = NULL; 528 } 529 if (sc->vtnet_vlan_detach != NULL) { 530 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 531 sc->vtnet_vlan_detach = NULL; 532 } 533 534 ifmedia_removeall(&sc->vtnet_media); 535 536 if (ifp != NULL) { 537 if_free(ifp); 538 sc->vtnet_ifp = NULL; 539 } 540 541 vtnet_free_rxtx_queues(sc); 542 vtnet_free_rx_filters(sc); 543 544 if (sc->vtnet_ctrl_vq != NULL) 545 vtnet_free_ctrl_vq(sc); 546 547 VTNET_CORE_LOCK_DESTROY(sc); 548 549 return (0); 550 } 551 552 static int 553 vtnet_suspend(device_t dev) 554 { 555 struct vtnet_softc *sc; 556 557 sc = device_get_softc(dev); 558 559 VTNET_CORE_LOCK(sc); 560 vtnet_stop(sc); 561 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 562 VTNET_CORE_UNLOCK(sc); 563 564 return (0); 565 } 566 567 static int 568 vtnet_resume(device_t dev) 569 { 570 struct vtnet_softc *sc; 571 if_t ifp; 572 573 sc = device_get_softc(dev); 574 ifp = sc->vtnet_ifp; 575 576 VTNET_CORE_LOCK(sc); 577 if (if_getflags(ifp) & IFF_UP) 578 vtnet_init_locked(sc, 0); 579 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 580 VTNET_CORE_UNLOCK(sc); 581 582 return (0); 583 } 584 585 static int 586 vtnet_shutdown(device_t dev) 587 { 588 /* 589 * Suspend already does all of what we need to 590 * do here; we just never expect to be resumed. 591 */ 592 return (vtnet_suspend(dev)); 593 } 594 595 static int 596 vtnet_attach_completed(device_t dev) 597 { 598 struct vtnet_softc *sc; 599 600 sc = device_get_softc(dev); 601 602 VTNET_CORE_LOCK(sc); 603 vtnet_attached_set_macaddr(sc); 604 VTNET_CORE_UNLOCK(sc); 605 606 return (0); 607 } 608 609 static int 610 vtnet_config_change(device_t dev) 611 { 612 struct vtnet_softc *sc; 613 614 sc = device_get_softc(dev); 615 616 VTNET_CORE_LOCK(sc); 617 vtnet_update_link_status(sc); 618 if (sc->vtnet_link_active != 0) 619 vtnet_tx_start_all(sc); 620 VTNET_CORE_UNLOCK(sc); 621 622 return (0); 623 } 624 625 static int 626 vtnet_negotiate_features(struct vtnet_softc *sc) 627 { 628 device_t dev; 629 uint64_t features, negotiated_features; 630 int no_csum; 631 632 dev = sc->vtnet_dev; 633 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 634 VTNET_LEGACY_FEATURES; 635 636 /* 637 * TSO and LRO are only available when their corresponding checksum 638 * offload feature is also negotiated. 639 */ 640 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 641 if (no_csum) 642 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 643 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 644 features &= ~VTNET_TSO_FEATURES; 645 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 646 features &= ~VTNET_LRO_FEATURES; 647 648 #ifndef VTNET_LEGACY_TX 649 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 650 features &= ~VIRTIO_NET_F_MQ; 651 #else 652 features &= ~VIRTIO_NET_F_MQ; 653 #endif 654 655 negotiated_features = virtio_negotiate_features(dev, features); 656 657 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 658 uint16_t mtu; 659 660 mtu = virtio_read_dev_config_2(dev, 661 offsetof(struct virtio_net_config, mtu)); 662 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 663 device_printf(dev, "Invalid MTU value: %d. " 664 "MTU feature disabled.\n", mtu); 665 features &= ~VIRTIO_NET_F_MTU; 666 negotiated_features = 667 virtio_negotiate_features(dev, features); 668 } 669 } 670 671 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 672 uint16_t npairs; 673 674 npairs = virtio_read_dev_config_2(dev, 675 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 676 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 677 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 678 device_printf(dev, "Invalid max_virtqueue_pairs value: " 679 "%d. Multiqueue feature disabled.\n", npairs); 680 features &= ~VIRTIO_NET_F_MQ; 681 negotiated_features = 682 virtio_negotiate_features(dev, features); 683 } 684 } 685 686 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 687 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 688 /* 689 * LRO without mergeable buffers requires special care. This 690 * is not ideal because every receive buffer must be large 691 * enough to hold the maximum TCP packet, the Ethernet header, 692 * and the header. This requires up to 34 descriptors with 693 * MCLBYTES clusters. If we do not have indirect descriptors, 694 * LRO is disabled since the virtqueue will not contain very 695 * many receive buffers. 696 */ 697 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 698 device_printf(dev, 699 "Host LRO disabled since both mergeable buffers " 700 "and indirect descriptors were not negotiated\n"); 701 features &= ~VTNET_LRO_FEATURES; 702 negotiated_features = 703 virtio_negotiate_features(dev, features); 704 } else 705 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 706 } 707 708 sc->vtnet_features = negotiated_features; 709 sc->vtnet_negotiated_features = negotiated_features; 710 711 return (virtio_finalize_features(dev)); 712 } 713 714 static int 715 vtnet_setup_features(struct vtnet_softc *sc) 716 { 717 device_t dev; 718 int error; 719 720 dev = sc->vtnet_dev; 721 722 error = vtnet_negotiate_features(sc); 723 if (error) 724 return (error); 725 726 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 727 sc->vtnet_flags |= VTNET_FLAG_MODERN; 728 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 729 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 730 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 731 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 732 733 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 734 /* This feature should always be negotiated. */ 735 sc->vtnet_flags |= VTNET_FLAG_MAC; 736 } 737 738 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 739 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 740 offsetof(struct virtio_net_config, mtu)); 741 } else 742 sc->vtnet_max_mtu = VTNET_MAX_MTU; 743 744 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 745 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 746 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 747 } else if (vtnet_modern(sc)) { 748 /* This is identical to the mergeable header. */ 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 750 } else 751 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 752 753 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 754 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 755 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 756 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 757 else 758 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 759 760 /* 761 * Favor "hardware" LRO if negotiated, but support software LRO as 762 * a fallback; there is usually little benefit (or worse) with both. 763 */ 764 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 765 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 766 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 767 768 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 769 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 770 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 771 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 772 else 773 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 774 775 sc->vtnet_req_vq_pairs = 1; 776 sc->vtnet_max_vq_pairs = 1; 777 778 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 779 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 780 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 782 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 783 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 784 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 785 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 786 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 787 788 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 789 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 790 offsetof(struct virtio_net_config, 791 max_virtqueue_pairs)); 792 } 793 } 794 795 if (sc->vtnet_max_vq_pairs > 1) { 796 int req; 797 798 /* 799 * Limit the maximum number of requested queue pairs to the 800 * number of CPUs and the configured maximum. 801 */ 802 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 803 if (req < 0) 804 req = 1; 805 if (req == 0) 806 req = mp_ncpus; 807 if (req > sc->vtnet_max_vq_pairs) 808 req = sc->vtnet_max_vq_pairs; 809 if (req > mp_ncpus) 810 req = mp_ncpus; 811 if (req > 1) { 812 sc->vtnet_req_vq_pairs = req; 813 sc->vtnet_flags |= VTNET_FLAG_MQ; 814 } 815 } 816 817 return (0); 818 } 819 820 static int 821 vtnet_init_rxq(struct vtnet_softc *sc, int id) 822 { 823 struct vtnet_rxq *rxq; 824 825 rxq = &sc->vtnet_rxqs[id]; 826 827 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 828 device_get_nameunit(sc->vtnet_dev), id); 829 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 830 831 rxq->vtnrx_sc = sc; 832 rxq->vtnrx_id = id; 833 834 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 835 if (rxq->vtnrx_sg == NULL) 836 return (ENOMEM); 837 838 #if defined(INET) || defined(INET6) 839 if (vtnet_software_lro(sc)) { 840 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 841 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 842 return (ENOMEM); 843 } 844 #endif 845 846 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 847 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 848 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 849 850 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 851 } 852 853 static int 854 vtnet_init_txq(struct vtnet_softc *sc, int id) 855 { 856 struct vtnet_txq *txq; 857 858 txq = &sc->vtnet_txqs[id]; 859 860 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 861 device_get_nameunit(sc->vtnet_dev), id); 862 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 863 864 txq->vtntx_sc = sc; 865 txq->vtntx_id = id; 866 867 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 868 if (txq->vtntx_sg == NULL) 869 return (ENOMEM); 870 871 #ifndef VTNET_LEGACY_TX 872 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 873 M_NOWAIT, &txq->vtntx_mtx); 874 if (txq->vtntx_br == NULL) 875 return (ENOMEM); 876 877 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 878 #endif 879 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 880 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 881 taskqueue_thread_enqueue, &txq->vtntx_tq); 882 if (txq->vtntx_tq == NULL) 883 return (ENOMEM); 884 885 return (0); 886 } 887 888 static int 889 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 890 { 891 int i, npairs, error; 892 893 npairs = sc->vtnet_max_vq_pairs; 894 895 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 896 M_NOWAIT | M_ZERO); 897 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 898 M_NOWAIT | M_ZERO); 899 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 900 return (ENOMEM); 901 902 for (i = 0; i < npairs; i++) { 903 error = vtnet_init_rxq(sc, i); 904 if (error) 905 return (error); 906 error = vtnet_init_txq(sc, i); 907 if (error) 908 return (error); 909 } 910 911 vtnet_set_rx_process_limit(sc); 912 vtnet_setup_queue_sysctl(sc); 913 914 return (0); 915 } 916 917 static void 918 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 919 { 920 921 rxq->vtnrx_sc = NULL; 922 rxq->vtnrx_id = -1; 923 924 #if defined(INET) || defined(INET6) 925 tcp_lro_free(&rxq->vtnrx_lro); 926 #endif 927 928 if (rxq->vtnrx_sg != NULL) { 929 sglist_free(rxq->vtnrx_sg); 930 rxq->vtnrx_sg = NULL; 931 } 932 933 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 934 mtx_destroy(&rxq->vtnrx_mtx); 935 } 936 937 static void 938 vtnet_destroy_txq(struct vtnet_txq *txq) 939 { 940 941 txq->vtntx_sc = NULL; 942 txq->vtntx_id = -1; 943 944 if (txq->vtntx_sg != NULL) { 945 sglist_free(txq->vtntx_sg); 946 txq->vtntx_sg = NULL; 947 } 948 949 #ifndef VTNET_LEGACY_TX 950 if (txq->vtntx_br != NULL) { 951 buf_ring_free(txq->vtntx_br, M_DEVBUF); 952 txq->vtntx_br = NULL; 953 } 954 #endif 955 956 if (mtx_initialized(&txq->vtntx_mtx) != 0) 957 mtx_destroy(&txq->vtntx_mtx); 958 } 959 960 static void 961 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 962 { 963 int i; 964 965 if (sc->vtnet_rxqs != NULL) { 966 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 967 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 968 free(sc->vtnet_rxqs, M_DEVBUF); 969 sc->vtnet_rxqs = NULL; 970 } 971 972 if (sc->vtnet_txqs != NULL) { 973 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 974 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 975 free(sc->vtnet_txqs, M_DEVBUF); 976 sc->vtnet_txqs = NULL; 977 } 978 } 979 980 static int 981 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 982 { 983 984 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 985 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 986 M_DEVBUF, M_NOWAIT | M_ZERO); 987 if (sc->vtnet_mac_filter == NULL) 988 return (ENOMEM); 989 } 990 991 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 992 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 993 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 994 if (sc->vtnet_vlan_filter == NULL) 995 return (ENOMEM); 996 } 997 998 return (0); 999 } 1000 1001 static void 1002 vtnet_free_rx_filters(struct vtnet_softc *sc) 1003 { 1004 1005 if (sc->vtnet_mac_filter != NULL) { 1006 free(sc->vtnet_mac_filter, M_DEVBUF); 1007 sc->vtnet_mac_filter = NULL; 1008 } 1009 1010 if (sc->vtnet_vlan_filter != NULL) { 1011 free(sc->vtnet_vlan_filter, M_DEVBUF); 1012 sc->vtnet_vlan_filter = NULL; 1013 } 1014 } 1015 1016 static int 1017 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1018 { 1019 device_t dev; 1020 struct vq_alloc_info *info; 1021 struct vtnet_rxq *rxq; 1022 struct vtnet_txq *txq; 1023 int i, idx, flags, nvqs, error; 1024 1025 dev = sc->vtnet_dev; 1026 flags = 0; 1027 1028 nvqs = sc->vtnet_max_vq_pairs * 2; 1029 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1030 nvqs++; 1031 1032 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1033 if (info == NULL) 1034 return (ENOMEM); 1035 1036 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1037 rxq = &sc->vtnet_rxqs[i]; 1038 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1039 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1040 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1041 1042 txq = &sc->vtnet_txqs[i]; 1043 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1044 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1045 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1046 } 1047 1048 /* These queues will not be used so allocate the minimum resources. */ 1049 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1050 rxq = &sc->vtnet_rxqs[i]; 1051 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1052 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1053 1054 txq = &sc->vtnet_txqs[i]; 1055 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1056 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1057 } 1058 1059 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1060 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1061 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1062 } 1063 1064 /* 1065 * TODO: Enable interrupt binding if this is multiqueue. This will 1066 * only matter when per-virtqueue MSIX is available. 1067 */ 1068 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1069 flags |= 0; 1070 1071 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1072 free(info, M_TEMP); 1073 1074 return (error); 1075 } 1076 1077 static int 1078 vtnet_alloc_interface(struct vtnet_softc *sc) 1079 { 1080 device_t dev; 1081 if_t ifp; 1082 1083 dev = sc->vtnet_dev; 1084 1085 ifp = if_alloc(IFT_ETHER); 1086 if (ifp == NULL) 1087 return (ENOMEM); 1088 1089 sc->vtnet_ifp = ifp; 1090 if_setsoftc(ifp, sc); 1091 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1092 1093 return (0); 1094 } 1095 1096 static int 1097 vtnet_setup_interface(struct vtnet_softc *sc) 1098 { 1099 device_t dev; 1100 struct pfil_head_args pa; 1101 if_t ifp; 1102 1103 dev = sc->vtnet_dev; 1104 ifp = sc->vtnet_ifp; 1105 1106 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1107 if_setbaudrate(ifp, IF_Gbps(10)); 1108 if_setinitfn(ifp, vtnet_init); 1109 if_setioctlfn(ifp, vtnet_ioctl); 1110 if_setgetcounterfn(ifp, vtnet_get_counter); 1111 #ifndef VTNET_LEGACY_TX 1112 if_settransmitfn(ifp, vtnet_txq_mq_start); 1113 if_setqflushfn(ifp, vtnet_qflush); 1114 #else 1115 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1116 if_setstartfn(ifp, vtnet_start); 1117 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1118 if_setsendqready(ifp); 1119 #endif 1120 1121 vtnet_get_macaddr(sc); 1122 1123 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1124 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1125 1126 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1127 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1128 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1129 1130 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1131 int gso; 1132 1133 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1134 1135 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1136 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1137 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1138 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1139 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1140 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1141 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1142 1143 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1144 int tso_maxlen; 1145 1146 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1147 1148 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1149 vtnet_tso_maxlen); 1150 if_sethwtsomax(ifp, tso_maxlen - 1151 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1152 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1153 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1154 } 1155 } 1156 1157 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1158 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1159 #ifdef notyet 1160 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1161 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1162 #endif 1163 1164 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1165 vtnet_fixup_needs_csum) != 0) 1166 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1167 1168 /* Support either "hardware" or software LRO. */ 1169 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1170 } 1171 1172 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1173 /* 1174 * VirtIO does not support VLAN tagging, but we can fake 1175 * it by inserting and removing the 802.1Q header during 1176 * transmit and receive. We are then able to do checksum 1177 * offloading of VLAN frames. 1178 */ 1179 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1180 } 1181 1182 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1183 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1184 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1185 1186 /* 1187 * Capabilities after here are not enabled by default. 1188 */ 1189 if_setcapenable(ifp, if_getcapabilities(ifp)); 1190 1191 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1192 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1193 1194 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1195 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1196 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1197 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1198 } 1199 1200 ether_ifattach(ifp, sc->vtnet_hwaddr); 1201 1202 /* Tell the upper layer(s) we support long frames. */ 1203 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1204 1205 DEBUGNET_SET(ifp, vtnet); 1206 1207 pa.pa_version = PFIL_VERSION; 1208 pa.pa_flags = PFIL_IN; 1209 pa.pa_type = PFIL_TYPE_ETHERNET; 1210 pa.pa_headname = if_name(ifp); 1211 sc->vtnet_pfil = pfil_head_register(&pa); 1212 1213 return (0); 1214 } 1215 1216 static int 1217 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1218 { 1219 int framesz; 1220 1221 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1222 return (MJUMPAGESIZE); 1223 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1224 return (MCLBYTES); 1225 1226 /* 1227 * Try to scale the receive mbuf cluster size from the MTU. We 1228 * could also use the VQ size to influence the selected size, 1229 * but that would only matter for very small queues. 1230 */ 1231 if (vtnet_modern(sc)) { 1232 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1233 framesz = sizeof(struct virtio_net_hdr_v1); 1234 } else 1235 framesz = sizeof(struct vtnet_rx_header); 1236 framesz += sizeof(struct ether_vlan_header) + mtu; 1237 1238 if (framesz <= MCLBYTES) 1239 return (MCLBYTES); 1240 else if (framesz <= MJUMPAGESIZE) 1241 return (MJUMPAGESIZE); 1242 else if (framesz <= MJUM9BYTES) 1243 return (MJUM9BYTES); 1244 1245 /* Sane default; avoid 16KB clusters. */ 1246 return (MCLBYTES); 1247 } 1248 1249 static int 1250 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1251 { 1252 if_t ifp; 1253 int clustersz; 1254 1255 ifp = sc->vtnet_ifp; 1256 VTNET_CORE_LOCK_ASSERT(sc); 1257 1258 if (if_getmtu(ifp) == mtu) 1259 return (0); 1260 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1261 return (EINVAL); 1262 1263 if_setmtu(ifp, mtu); 1264 clustersz = vtnet_rx_cluster_size(sc, mtu); 1265 1266 if (clustersz != sc->vtnet_rx_clustersz && 1267 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1268 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1269 vtnet_init_locked(sc, 0); 1270 } 1271 1272 return (0); 1273 } 1274 1275 static int 1276 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1277 { 1278 if_t ifp; 1279 int drv_running; 1280 1281 ifp = sc->vtnet_ifp; 1282 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1283 1284 VTNET_CORE_LOCK_ASSERT(sc); 1285 1286 if ((if_getflags(ifp) & IFF_UP) == 0) { 1287 if (drv_running) 1288 vtnet_stop(sc); 1289 goto out; 1290 } 1291 1292 if (!drv_running) { 1293 vtnet_init_locked(sc, 0); 1294 goto out; 1295 } 1296 1297 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1298 (IFF_PROMISC | IFF_ALLMULTI)) { 1299 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1300 vtnet_rx_filter(sc); 1301 else { 1302 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & IFF_ALLMULTI) 1303 return (ENOTSUP); 1304 if_setflagbits(ifp, IFF_PROMISC, 0); 1305 } 1306 } 1307 1308 out: 1309 sc->vtnet_if_flags = if_getflags(ifp); 1310 return (0); 1311 } 1312 1313 static int 1314 vtnet_ioctl_multi(struct vtnet_softc *sc) 1315 { 1316 if_t ifp; 1317 1318 ifp = sc->vtnet_ifp; 1319 1320 VTNET_CORE_LOCK_ASSERT(sc); 1321 1322 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1323 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1324 vtnet_rx_filter_mac(sc); 1325 1326 return (0); 1327 } 1328 1329 static int 1330 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1331 { 1332 if_t ifp; 1333 int mask, reinit, update; 1334 1335 ifp = sc->vtnet_ifp; 1336 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1337 reinit = update = 0; 1338 1339 VTNET_CORE_LOCK_ASSERT(sc); 1340 1341 if (mask & IFCAP_TXCSUM) 1342 if_togglecapenable(ifp, IFCAP_TXCSUM); 1343 if (mask & IFCAP_TXCSUM_IPV6) 1344 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1345 if (mask & IFCAP_TSO4) 1346 if_togglecapenable(ifp, IFCAP_TSO4); 1347 if (mask & IFCAP_TSO6) 1348 if_togglecapenable(ifp, IFCAP_TSO6); 1349 1350 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1351 /* 1352 * These Rx features require the negotiated features to 1353 * be updated. Avoid a full reinit if possible. 1354 */ 1355 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1356 update = 1; 1357 else 1358 reinit = 1; 1359 1360 /* BMV: Avoid needless renegotiation for just software LRO. */ 1361 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1362 IFCAP_LRO && vtnet_software_lro(sc)) 1363 reinit = update = 0; 1364 1365 if (mask & IFCAP_RXCSUM) 1366 if_togglecapenable(ifp, IFCAP_RXCSUM); 1367 if (mask & IFCAP_RXCSUM_IPV6) 1368 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1369 if (mask & IFCAP_LRO) 1370 if_togglecapenable(ifp, IFCAP_LRO); 1371 1372 /* 1373 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1374 * so treat them as a pair. Guest TSO (LRO) requires receive 1375 * checksums. 1376 */ 1377 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1378 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1379 #ifdef notyet 1380 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1381 #endif 1382 } else 1383 if_setcapenablebit(ifp, 0, 1384 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1385 } 1386 1387 if (mask & IFCAP_VLAN_HWFILTER) { 1388 /* These Rx features require renegotiation. */ 1389 reinit = 1; 1390 1391 if (mask & IFCAP_VLAN_HWFILTER) 1392 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1393 } 1394 1395 if (mask & IFCAP_VLAN_HWTSO) 1396 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1397 if (mask & IFCAP_VLAN_HWTAGGING) 1398 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1399 1400 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1401 if (reinit) { 1402 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1403 vtnet_init_locked(sc, 0); 1404 } else if (update) 1405 vtnet_update_rx_offloads(sc); 1406 } 1407 1408 return (0); 1409 } 1410 1411 static int 1412 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1413 { 1414 struct vtnet_softc *sc; 1415 struct ifreq *ifr; 1416 int error; 1417 1418 sc = if_getsoftc(ifp); 1419 ifr = (struct ifreq *) data; 1420 error = 0; 1421 1422 switch (cmd) { 1423 case SIOCSIFMTU: 1424 VTNET_CORE_LOCK(sc); 1425 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1426 VTNET_CORE_UNLOCK(sc); 1427 break; 1428 1429 case SIOCSIFFLAGS: 1430 VTNET_CORE_LOCK(sc); 1431 error = vtnet_ioctl_ifflags(sc); 1432 VTNET_CORE_UNLOCK(sc); 1433 break; 1434 1435 case SIOCADDMULTI: 1436 case SIOCDELMULTI: 1437 VTNET_CORE_LOCK(sc); 1438 error = vtnet_ioctl_multi(sc); 1439 VTNET_CORE_UNLOCK(sc); 1440 break; 1441 1442 case SIOCSIFMEDIA: 1443 case SIOCGIFMEDIA: 1444 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1445 break; 1446 1447 case SIOCSIFCAP: 1448 VTNET_CORE_LOCK(sc); 1449 error = vtnet_ioctl_ifcap(sc, ifr); 1450 VTNET_CORE_UNLOCK(sc); 1451 VLAN_CAPABILITIES(ifp); 1452 break; 1453 1454 default: 1455 error = ether_ioctl(ifp, cmd, data); 1456 break; 1457 } 1458 1459 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1460 1461 return (error); 1462 } 1463 1464 static int 1465 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1466 { 1467 struct virtqueue *vq; 1468 int nbufs, error; 1469 1470 #ifdef DEV_NETMAP 1471 error = vtnet_netmap_rxq_populate(rxq); 1472 if (error >= 0) 1473 return (error); 1474 #endif /* DEV_NETMAP */ 1475 1476 vq = rxq->vtnrx_vq; 1477 error = ENOSPC; 1478 1479 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1480 error = vtnet_rxq_new_buf(rxq); 1481 if (error) 1482 break; 1483 } 1484 1485 if (nbufs > 0) { 1486 virtqueue_notify(vq); 1487 /* 1488 * EMSGSIZE signifies the virtqueue did not have enough 1489 * entries available to hold the last mbuf. This is not 1490 * an error. 1491 */ 1492 if (error == EMSGSIZE) 1493 error = 0; 1494 } 1495 1496 return (error); 1497 } 1498 1499 static void 1500 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1501 { 1502 struct virtqueue *vq; 1503 struct mbuf *m; 1504 int last; 1505 #ifdef DEV_NETMAP 1506 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1507 rxq->vtnrx_id, NR_RX); 1508 #else /* !DEV_NETMAP */ 1509 void *kring = NULL; 1510 #endif /* !DEV_NETMAP */ 1511 1512 vq = rxq->vtnrx_vq; 1513 last = 0; 1514 1515 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1516 if (kring == NULL) 1517 m_freem(m); 1518 } 1519 1520 KASSERT(virtqueue_empty(vq), 1521 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1522 } 1523 1524 static struct mbuf * 1525 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1526 { 1527 struct mbuf *m_head, *m_tail, *m; 1528 int i, size; 1529 1530 m_head = NULL; 1531 size = sc->vtnet_rx_clustersz; 1532 1533 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1534 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1535 1536 for (i = 0; i < nbufs; i++) { 1537 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1538 if (m == NULL) { 1539 sc->vtnet_stats.mbuf_alloc_failed++; 1540 m_freem(m_head); 1541 return (NULL); 1542 } 1543 1544 m->m_len = size; 1545 if (m_head != NULL) { 1546 m_tail->m_next = m; 1547 m_tail = m; 1548 } else 1549 m_head = m_tail = m; 1550 } 1551 1552 if (m_tailp != NULL) 1553 *m_tailp = m_tail; 1554 1555 return (m_head); 1556 } 1557 1558 /* 1559 * Slow path for when LRO without mergeable buffers is negotiated. 1560 */ 1561 static int 1562 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1563 int len0) 1564 { 1565 struct vtnet_softc *sc; 1566 struct mbuf *m, *m_prev, *m_new, *m_tail; 1567 int len, clustersz, nreplace, error; 1568 1569 sc = rxq->vtnrx_sc; 1570 clustersz = sc->vtnet_rx_clustersz; 1571 1572 m_prev = NULL; 1573 m_tail = NULL; 1574 nreplace = 0; 1575 1576 m = m0; 1577 len = len0; 1578 1579 /* 1580 * Since these mbuf chains are so large, avoid allocating a complete 1581 * replacement when the received frame did not consume the entire 1582 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1583 */ 1584 while (len > 0) { 1585 if (m == NULL) { 1586 sc->vtnet_stats.rx_frame_too_large++; 1587 return (EMSGSIZE); 1588 } 1589 1590 /* 1591 * Every mbuf should have the expected cluster size since that 1592 * is also used to allocate the replacements. 1593 */ 1594 KASSERT(m->m_len == clustersz, 1595 ("%s: mbuf size %d not expected cluster size %d", __func__, 1596 m->m_len, clustersz)); 1597 1598 m->m_len = MIN(m->m_len, len); 1599 len -= m->m_len; 1600 1601 m_prev = m; 1602 m = m->m_next; 1603 nreplace++; 1604 } 1605 1606 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1607 ("%s: invalid replacement mbuf count %d max %d", __func__, 1608 nreplace, sc->vtnet_rx_nmbufs)); 1609 1610 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1611 if (m_new == NULL) { 1612 m_prev->m_len = clustersz; 1613 return (ENOBUFS); 1614 } 1615 1616 /* 1617 * Move any unused mbufs from the received mbuf chain onto the 1618 * end of the replacement chain. 1619 */ 1620 if (m_prev->m_next != NULL) { 1621 m_tail->m_next = m_prev->m_next; 1622 m_prev->m_next = NULL; 1623 } 1624 1625 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1626 if (error) { 1627 /* 1628 * The replacement is suppose to be an copy of the one 1629 * dequeued so this is a very unexpected error. 1630 * 1631 * Restore the m0 chain to the original state if it was 1632 * modified so we can then discard it. 1633 */ 1634 if (m_tail->m_next != NULL) { 1635 m_prev->m_next = m_tail->m_next; 1636 m_tail->m_next = NULL; 1637 } 1638 m_prev->m_len = clustersz; 1639 sc->vtnet_stats.rx_enq_replacement_failed++; 1640 m_freem(m_new); 1641 } 1642 1643 return (error); 1644 } 1645 1646 static int 1647 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1648 { 1649 struct vtnet_softc *sc; 1650 struct mbuf *m_new; 1651 int error; 1652 1653 sc = rxq->vtnrx_sc; 1654 1655 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1656 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1657 1658 MPASS(m->m_next == NULL); 1659 if (m->m_len < len) 1660 return (EMSGSIZE); 1661 1662 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1663 if (m_new == NULL) 1664 return (ENOBUFS); 1665 1666 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1667 if (error) { 1668 sc->vtnet_stats.rx_enq_replacement_failed++; 1669 m_freem(m_new); 1670 } else 1671 m->m_len = len; 1672 1673 return (error); 1674 } 1675 1676 static int 1677 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1678 { 1679 struct vtnet_softc *sc; 1680 struct sglist *sg; 1681 int header_inlined, error; 1682 1683 sc = rxq->vtnrx_sc; 1684 sg = rxq->vtnrx_sg; 1685 1686 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1687 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1688 VTNET_RXQ_LOCK_ASSERT(rxq); 1689 1690 sglist_reset(sg); 1691 header_inlined = vtnet_modern(sc) || 1692 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1693 1694 if (header_inlined) 1695 error = sglist_append_mbuf(sg, m); 1696 else { 1697 struct vtnet_rx_header *rxhdr = 1698 mtod(m, struct vtnet_rx_header *); 1699 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1700 1701 /* Append the header and remaining mbuf data. */ 1702 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1703 if (error) 1704 return (error); 1705 error = sglist_append(sg, &rxhdr[1], 1706 m->m_len - sizeof(struct vtnet_rx_header)); 1707 if (error) 1708 return (error); 1709 1710 if (m->m_next != NULL) 1711 error = sglist_append_mbuf(sg, m->m_next); 1712 } 1713 1714 if (error) 1715 return (error); 1716 1717 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1718 } 1719 1720 static int 1721 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1722 { 1723 struct vtnet_softc *sc; 1724 struct mbuf *m; 1725 int error; 1726 1727 sc = rxq->vtnrx_sc; 1728 1729 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1730 if (m == NULL) 1731 return (ENOBUFS); 1732 1733 error = vtnet_rxq_enqueue_buf(rxq, m); 1734 if (error) 1735 m_freem(m); 1736 1737 return (error); 1738 } 1739 1740 static int 1741 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1742 int hoff, struct virtio_net_hdr *hdr) 1743 { 1744 struct vtnet_softc *sc; 1745 int error; 1746 1747 sc = rxq->vtnrx_sc; 1748 1749 /* 1750 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1751 * not have an analogous CSUM flag. The checksum has been validated, 1752 * but is incomplete (TCP/UDP pseudo header). 1753 * 1754 * The packet is likely from another VM on the same host that itself 1755 * performed checksum offloading so Tx/Rx is basically a memcpy and 1756 * the checksum has little value. 1757 * 1758 * Default to receiving the packet as-is for performance reasons, but 1759 * this can cause issues if the packet is to be forwarded because it 1760 * does not contain a valid checksum. This patch may be helpful: 1761 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1762 * compute the checksum if requested. 1763 * 1764 * BMV: Need to add an CSUM_PARTIAL flag? 1765 */ 1766 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1767 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1768 return (error); 1769 } 1770 1771 /* 1772 * Compute the checksum in the driver so the packet will contain a 1773 * valid checksum. The checksum is at csum_offset from csum_start. 1774 */ 1775 switch (etype) { 1776 #if defined(INET) || defined(INET6) 1777 case ETHERTYPE_IP: 1778 case ETHERTYPE_IPV6: { 1779 int csum_off, csum_end; 1780 uint16_t csum; 1781 1782 csum_off = hdr->csum_start + hdr->csum_offset; 1783 csum_end = csum_off + sizeof(uint16_t); 1784 1785 /* Assume checksum will be in the first mbuf. */ 1786 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1787 return (1); 1788 1789 /* 1790 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1791 * checksum and write it at the specified offset. We could 1792 * try to verify the packet: csum_start should probably 1793 * correspond to the start of the TCP/UDP header. 1794 * 1795 * BMV: Need to properly handle UDP with zero checksum. Is 1796 * the IPv4 header checksum implicitly validated? 1797 */ 1798 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1799 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1800 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1801 m->m_pkthdr.csum_data = 0xFFFF; 1802 break; 1803 } 1804 #endif 1805 default: 1806 sc->vtnet_stats.rx_csum_bad_ethtype++; 1807 return (1); 1808 } 1809 1810 return (0); 1811 } 1812 1813 static int 1814 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1815 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1816 { 1817 #if 0 1818 struct vtnet_softc *sc; 1819 #endif 1820 int protocol; 1821 1822 #if 0 1823 sc = rxq->vtnrx_sc; 1824 #endif 1825 1826 switch (etype) { 1827 #if defined(INET) 1828 case ETHERTYPE_IP: 1829 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1830 protocol = IPPROTO_DONE; 1831 else { 1832 struct ip *ip = (struct ip *)(m->m_data + hoff); 1833 protocol = ip->ip_p; 1834 } 1835 break; 1836 #endif 1837 #if defined(INET6) 1838 case ETHERTYPE_IPV6: 1839 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1840 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1841 protocol = IPPROTO_DONE; 1842 break; 1843 #endif 1844 default: 1845 protocol = IPPROTO_DONE; 1846 break; 1847 } 1848 1849 switch (protocol) { 1850 case IPPROTO_TCP: 1851 case IPPROTO_UDP: 1852 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1853 m->m_pkthdr.csum_data = 0xFFFF; 1854 break; 1855 default: 1856 /* 1857 * FreeBSD does not support checksum offloading of this 1858 * protocol. Let the stack re-verify the checksum later 1859 * if the protocol is supported. 1860 */ 1861 #if 0 1862 if_printf(sc->vtnet_ifp, 1863 "%s: checksum offload of unsupported protocol " 1864 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1865 __func__, etype, protocol, hdr->csum_start, 1866 hdr->csum_offset); 1867 #endif 1868 break; 1869 } 1870 1871 return (0); 1872 } 1873 1874 static int 1875 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1876 struct virtio_net_hdr *hdr) 1877 { 1878 const struct ether_header *eh; 1879 int hoff; 1880 uint16_t etype; 1881 1882 eh = mtod(m, const struct ether_header *); 1883 etype = ntohs(eh->ether_type); 1884 if (etype == ETHERTYPE_VLAN) { 1885 /* TODO BMV: Handle QinQ. */ 1886 const struct ether_vlan_header *evh = 1887 mtod(m, const struct ether_vlan_header *); 1888 etype = ntohs(evh->evl_proto); 1889 hoff = sizeof(struct ether_vlan_header); 1890 } else 1891 hoff = sizeof(struct ether_header); 1892 1893 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1894 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1895 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1896 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1897 } 1898 1899 static void 1900 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1901 { 1902 struct mbuf *m; 1903 1904 while (--nbufs > 0) { 1905 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1906 if (m == NULL) 1907 break; 1908 vtnet_rxq_discard_buf(rxq, m); 1909 } 1910 } 1911 1912 static void 1913 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1914 { 1915 int error __diagused; 1916 1917 /* 1918 * Requeue the discarded mbuf. This should always be successful 1919 * since it was just dequeued. 1920 */ 1921 error = vtnet_rxq_enqueue_buf(rxq, m); 1922 KASSERT(error == 0, 1923 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1924 } 1925 1926 static int 1927 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1928 { 1929 struct vtnet_softc *sc; 1930 struct virtqueue *vq; 1931 struct mbuf *m_tail; 1932 1933 sc = rxq->vtnrx_sc; 1934 vq = rxq->vtnrx_vq; 1935 m_tail = m_head; 1936 1937 while (--nbufs > 0) { 1938 struct mbuf *m; 1939 uint32_t len; 1940 1941 m = virtqueue_dequeue(vq, &len); 1942 if (m == NULL) { 1943 rxq->vtnrx_stats.vrxs_ierrors++; 1944 goto fail; 1945 } 1946 1947 if (vtnet_rxq_new_buf(rxq) != 0) { 1948 rxq->vtnrx_stats.vrxs_iqdrops++; 1949 vtnet_rxq_discard_buf(rxq, m); 1950 if (nbufs > 1) 1951 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1952 goto fail; 1953 } 1954 1955 if (m->m_len < len) 1956 len = m->m_len; 1957 1958 m->m_len = len; 1959 m->m_flags &= ~M_PKTHDR; 1960 1961 m_head->m_pkthdr.len += len; 1962 m_tail->m_next = m; 1963 m_tail = m; 1964 } 1965 1966 return (0); 1967 1968 fail: 1969 sc->vtnet_stats.rx_mergeable_failed++; 1970 m_freem(m_head); 1971 1972 return (1); 1973 } 1974 1975 #if defined(INET) || defined(INET6) 1976 static int 1977 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1978 { 1979 struct lro_ctrl *lro; 1980 1981 lro = &rxq->vtnrx_lro; 1982 1983 if (lro->lro_mbuf_max != 0) { 1984 tcp_lro_queue_mbuf(lro, m); 1985 return (0); 1986 } 1987 1988 return (tcp_lro_rx(lro, m, 0)); 1989 } 1990 #endif 1991 1992 static void 1993 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1994 struct virtio_net_hdr *hdr) 1995 { 1996 struct vtnet_softc *sc; 1997 if_t ifp; 1998 1999 sc = rxq->vtnrx_sc; 2000 ifp = sc->vtnet_ifp; 2001 2002 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2003 struct ether_header *eh = mtod(m, struct ether_header *); 2004 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2005 vtnet_vlan_tag_remove(m); 2006 /* 2007 * With the 802.1Q header removed, update the 2008 * checksum starting location accordingly. 2009 */ 2010 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2011 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2012 } 2013 } 2014 2015 m->m_pkthdr.flowid = rxq->vtnrx_id; 2016 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2017 2018 if (hdr->flags & 2019 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2020 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2021 rxq->vtnrx_stats.vrxs_csum++; 2022 else 2023 rxq->vtnrx_stats.vrxs_csum_failed++; 2024 } 2025 2026 if (hdr->gso_size != 0) { 2027 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2028 case VIRTIO_NET_HDR_GSO_TCPV4: 2029 case VIRTIO_NET_HDR_GSO_TCPV6: 2030 m->m_pkthdr.lro_nsegs = 2031 howmany(m->m_pkthdr.len, hdr->gso_size); 2032 rxq->vtnrx_stats.vrxs_host_lro++; 2033 break; 2034 } 2035 } 2036 2037 rxq->vtnrx_stats.vrxs_ipackets++; 2038 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2039 2040 #if defined(INET) || defined(INET6) 2041 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2042 if (vtnet_lro_rx(rxq, m) == 0) 2043 return; 2044 } 2045 #endif 2046 2047 if_input(ifp, m); 2048 } 2049 2050 static int 2051 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2052 { 2053 struct virtio_net_hdr lhdr, *hdr; 2054 struct vtnet_softc *sc; 2055 if_t ifp; 2056 struct virtqueue *vq; 2057 int deq, count; 2058 2059 sc = rxq->vtnrx_sc; 2060 vq = rxq->vtnrx_vq; 2061 ifp = sc->vtnet_ifp; 2062 deq = 0; 2063 count = sc->vtnet_rx_process_limit; 2064 2065 VTNET_RXQ_LOCK_ASSERT(rxq); 2066 2067 while (count-- > 0) { 2068 struct mbuf *m; 2069 uint32_t len, nbufs, adjsz; 2070 2071 m = virtqueue_dequeue(vq, &len); 2072 if (m == NULL) 2073 break; 2074 deq++; 2075 2076 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2077 rxq->vtnrx_stats.vrxs_ierrors++; 2078 vtnet_rxq_discard_buf(rxq, m); 2079 continue; 2080 } 2081 2082 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2083 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2084 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2085 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2086 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2087 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2088 } else if (vtnet_modern(sc)) { 2089 nbufs = 1; /* num_buffers is always 1 */ 2090 adjsz = sizeof(struct virtio_net_hdr_v1); 2091 } else { 2092 nbufs = 1; 2093 adjsz = sizeof(struct vtnet_rx_header); 2094 /* 2095 * Account for our gap between the header and start of 2096 * data to keep the segments separated. 2097 */ 2098 len += VTNET_RX_HEADER_PAD; 2099 } 2100 2101 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2102 rxq->vtnrx_stats.vrxs_iqdrops++; 2103 vtnet_rxq_discard_buf(rxq, m); 2104 if (nbufs > 1) 2105 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2106 continue; 2107 } 2108 2109 m->m_pkthdr.len = len; 2110 m->m_pkthdr.rcvif = ifp; 2111 m->m_pkthdr.csum_flags = 0; 2112 2113 if (nbufs > 1) { 2114 /* Dequeue the rest of chain. */ 2115 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2116 continue; 2117 } 2118 2119 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2120 2121 /* 2122 * Save an endian swapped version of the header prior to it 2123 * being stripped. The header is always at the start of the 2124 * mbuf data. num_buffers was already saved (and not needed) 2125 * so use the standard header. 2126 */ 2127 hdr = mtod(m, struct virtio_net_hdr *); 2128 lhdr.flags = hdr->flags; 2129 lhdr.gso_type = hdr->gso_type; 2130 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2131 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2132 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2133 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2134 m_adj(m, adjsz); 2135 2136 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2137 pfil_return_t pfil; 2138 2139 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2140 switch (pfil) { 2141 case PFIL_DROPPED: 2142 case PFIL_CONSUMED: 2143 continue; 2144 default: 2145 KASSERT(pfil == PFIL_PASS, 2146 ("Filter returned %d!", pfil)); 2147 } 2148 } 2149 2150 vtnet_rxq_input(rxq, m, &lhdr); 2151 } 2152 2153 if (deq > 0) { 2154 #if defined(INET) || defined(INET6) 2155 if (vtnet_software_lro(sc)) 2156 tcp_lro_flush_all(&rxq->vtnrx_lro); 2157 #endif 2158 virtqueue_notify(vq); 2159 } 2160 2161 return (count > 0 ? 0 : EAGAIN); 2162 } 2163 2164 static void 2165 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2166 { 2167 struct vtnet_softc *sc; 2168 if_t ifp; 2169 u_int more; 2170 #ifdef DEV_NETMAP 2171 int nmirq; 2172 #endif /* DEV_NETMAP */ 2173 2174 sc = rxq->vtnrx_sc; 2175 ifp = sc->vtnet_ifp; 2176 2177 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2178 /* 2179 * Ignore this interrupt. Either this is a spurious interrupt 2180 * or multiqueue without per-VQ MSIX so every queue needs to 2181 * be polled (a brain dead configuration we could try harder 2182 * to avoid). 2183 */ 2184 vtnet_rxq_disable_intr(rxq); 2185 return; 2186 } 2187 2188 VTNET_RXQ_LOCK(rxq); 2189 2190 #ifdef DEV_NETMAP 2191 /* 2192 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2193 * This is not necessary to serialize the access to the RX vq, but 2194 * rather to avoid races that may happen if this interface is 2195 * attached to a VALE switch, which would cause received packets 2196 * to stall in the RX queue (nm_kr_tryget() could find the kring 2197 * busy when called from netmap_bwrap_intr_notify()). 2198 */ 2199 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2200 if (nmirq != NM_IRQ_PASS) { 2201 VTNET_RXQ_UNLOCK(rxq); 2202 if (nmirq == NM_IRQ_RESCHED) { 2203 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2204 } 2205 return; 2206 } 2207 #endif /* DEV_NETMAP */ 2208 2209 again: 2210 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2211 VTNET_RXQ_UNLOCK(rxq); 2212 return; 2213 } 2214 2215 more = vtnet_rxq_eof(rxq); 2216 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2217 if (!more) 2218 vtnet_rxq_disable_intr(rxq); 2219 /* 2220 * This is an occasional condition or race (when !more), 2221 * so retry a few times before scheduling the taskqueue. 2222 */ 2223 if (tries-- > 0) 2224 goto again; 2225 2226 rxq->vtnrx_stats.vrxs_rescheduled++; 2227 VTNET_RXQ_UNLOCK(rxq); 2228 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2229 } else 2230 VTNET_RXQ_UNLOCK(rxq); 2231 } 2232 2233 static void 2234 vtnet_rx_vq_intr(void *xrxq) 2235 { 2236 struct vtnet_rxq *rxq; 2237 2238 rxq = xrxq; 2239 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2240 } 2241 2242 static void 2243 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2244 { 2245 struct vtnet_rxq *rxq; 2246 2247 rxq = xrxq; 2248 vtnet_rx_vq_process(rxq, 0); 2249 } 2250 2251 static int 2252 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2253 { 2254 struct vtnet_softc *sc; 2255 int threshold; 2256 2257 sc = txq->vtntx_sc; 2258 2259 /* 2260 * The Tx interrupt is disabled until the queue free count falls 2261 * below our threshold. Completed frames are drained from the Tx 2262 * virtqueue before transmitting new frames and in the watchdog 2263 * callout, so the frequency of Tx interrupts is greatly reduced, 2264 * at the cost of not freeing mbufs as quickly as they otherwise 2265 * would be. 2266 */ 2267 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2268 2269 /* 2270 * Without indirect descriptors, leave enough room for the most 2271 * segments we handle. 2272 */ 2273 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2274 threshold < sc->vtnet_tx_nsegs) 2275 threshold = sc->vtnet_tx_nsegs; 2276 2277 return (threshold); 2278 } 2279 2280 static int 2281 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2282 { 2283 struct virtqueue *vq; 2284 2285 vq = txq->vtntx_vq; 2286 2287 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2288 } 2289 2290 static int 2291 vtnet_txq_notify(struct vtnet_txq *txq) 2292 { 2293 struct virtqueue *vq; 2294 2295 vq = txq->vtntx_vq; 2296 2297 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2298 virtqueue_notify(vq); 2299 2300 if (vtnet_txq_enable_intr(txq) == 0) 2301 return (0); 2302 2303 /* 2304 * Drain frames that were completed since last checked. If this 2305 * causes the queue to go above the threshold, the caller should 2306 * continue transmitting. 2307 */ 2308 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2309 virtqueue_disable_intr(vq); 2310 return (1); 2311 } 2312 2313 return (0); 2314 } 2315 2316 static void 2317 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2318 { 2319 struct virtqueue *vq; 2320 struct vtnet_tx_header *txhdr; 2321 int last; 2322 #ifdef DEV_NETMAP 2323 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2324 txq->vtntx_id, NR_TX); 2325 #else /* !DEV_NETMAP */ 2326 void *kring = NULL; 2327 #endif /* !DEV_NETMAP */ 2328 2329 vq = txq->vtntx_vq; 2330 last = 0; 2331 2332 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2333 if (kring == NULL) { 2334 m_freem(txhdr->vth_mbuf); 2335 uma_zfree(vtnet_tx_header_zone, txhdr); 2336 } 2337 } 2338 2339 KASSERT(virtqueue_empty(vq), 2340 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2341 } 2342 2343 /* 2344 * BMV: This can go away once we finally have offsets in the mbuf header. 2345 */ 2346 static int 2347 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2348 int *proto, int *start) 2349 { 2350 struct vtnet_softc *sc; 2351 struct ether_vlan_header *evh; 2352 #if defined(INET) || defined(INET6) 2353 int offset; 2354 #endif 2355 2356 sc = txq->vtntx_sc; 2357 2358 evh = mtod(m, struct ether_vlan_header *); 2359 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2360 /* BMV: We should handle nested VLAN tags too. */ 2361 *etype = ntohs(evh->evl_proto); 2362 #if defined(INET) || defined(INET6) 2363 offset = sizeof(struct ether_vlan_header); 2364 #endif 2365 } else { 2366 *etype = ntohs(evh->evl_encap_proto); 2367 #if defined(INET) || defined(INET6) 2368 offset = sizeof(struct ether_header); 2369 #endif 2370 } 2371 2372 switch (*etype) { 2373 #if defined(INET) 2374 case ETHERTYPE_IP: { 2375 struct ip *ip, iphdr; 2376 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2377 m_copydata(m, offset, sizeof(struct ip), 2378 (caddr_t) &iphdr); 2379 ip = &iphdr; 2380 } else 2381 ip = (struct ip *)(m->m_data + offset); 2382 *proto = ip->ip_p; 2383 *start = offset + (ip->ip_hl << 2); 2384 break; 2385 } 2386 #endif 2387 #if defined(INET6) 2388 case ETHERTYPE_IPV6: 2389 *proto = -1; 2390 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2391 /* Assert the network stack sent us a valid packet. */ 2392 KASSERT(*start > offset, 2393 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2394 *start, offset, *proto)); 2395 break; 2396 #endif 2397 default: 2398 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2399 return (EINVAL); 2400 } 2401 2402 return (0); 2403 } 2404 2405 static int 2406 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2407 int offset, struct virtio_net_hdr *hdr) 2408 { 2409 static struct timeval lastecn; 2410 static int curecn; 2411 struct vtnet_softc *sc; 2412 struct tcphdr *tcp, tcphdr; 2413 2414 sc = txq->vtntx_sc; 2415 2416 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2417 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2418 tcp = &tcphdr; 2419 } else 2420 tcp = (struct tcphdr *)(m->m_data + offset); 2421 2422 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2423 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2424 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2425 VIRTIO_NET_HDR_GSO_TCPV6; 2426 2427 if (__predict_false(tcp->th_flags & TH_CWR)) { 2428 /* 2429 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2430 * FreeBSD, ECN support is not on a per-interface basis, 2431 * but globally via the net.inet.tcp.ecn.enable sysctl 2432 * knob. The default is off. 2433 */ 2434 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2435 if (ppsratecheck(&lastecn, &curecn, 1)) 2436 if_printf(sc->vtnet_ifp, 2437 "TSO with ECN not negotiated with host\n"); 2438 return (ENOTSUP); 2439 } 2440 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2441 } 2442 2443 txq->vtntx_stats.vtxs_tso++; 2444 2445 return (0); 2446 } 2447 2448 static struct mbuf * 2449 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2450 struct virtio_net_hdr *hdr) 2451 { 2452 struct vtnet_softc *sc; 2453 int flags, etype, csum_start, proto, error; 2454 2455 sc = txq->vtntx_sc; 2456 flags = m->m_pkthdr.csum_flags; 2457 2458 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2459 if (error) 2460 goto drop; 2461 2462 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2463 /* Sanity check the parsed mbuf matches the offload flags. */ 2464 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2465 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2466 && etype != ETHERTYPE_IPV6))) { 2467 sc->vtnet_stats.tx_csum_proto_mismatch++; 2468 goto drop; 2469 } 2470 2471 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2472 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2473 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2474 txq->vtntx_stats.vtxs_csum++; 2475 } 2476 2477 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2478 /* 2479 * Sanity check the parsed mbuf IP protocol is TCP, and 2480 * VirtIO TSO reqires the checksum offloading above. 2481 */ 2482 if (__predict_false(proto != IPPROTO_TCP)) { 2483 sc->vtnet_stats.tx_tso_not_tcp++; 2484 goto drop; 2485 } else if (__predict_false((hdr->flags & 2486 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2487 sc->vtnet_stats.tx_tso_without_csum++; 2488 goto drop; 2489 } 2490 2491 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2492 if (error) 2493 goto drop; 2494 } 2495 2496 return (m); 2497 2498 drop: 2499 m_freem(m); 2500 return (NULL); 2501 } 2502 2503 static int 2504 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2505 struct vtnet_tx_header *txhdr) 2506 { 2507 struct vtnet_softc *sc; 2508 struct virtqueue *vq; 2509 struct sglist *sg; 2510 struct mbuf *m; 2511 int error; 2512 2513 sc = txq->vtntx_sc; 2514 vq = txq->vtntx_vq; 2515 sg = txq->vtntx_sg; 2516 m = *m_head; 2517 2518 sglist_reset(sg); 2519 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2520 if (error != 0 || sg->sg_nseg != 1) { 2521 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2522 __func__, error, sg->sg_nseg)); 2523 goto fail; 2524 } 2525 2526 error = sglist_append_mbuf(sg, m); 2527 if (error) { 2528 m = m_defrag(m, M_NOWAIT); 2529 if (m == NULL) 2530 goto fail; 2531 2532 *m_head = m; 2533 sc->vtnet_stats.tx_defragged++; 2534 2535 error = sglist_append_mbuf(sg, m); 2536 if (error) 2537 goto fail; 2538 } 2539 2540 txhdr->vth_mbuf = m; 2541 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2542 2543 return (error); 2544 2545 fail: 2546 sc->vtnet_stats.tx_defrag_failed++; 2547 m_freem(*m_head); 2548 *m_head = NULL; 2549 2550 return (ENOBUFS); 2551 } 2552 2553 static int 2554 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2555 { 2556 struct vtnet_tx_header *txhdr; 2557 struct virtio_net_hdr *hdr; 2558 struct mbuf *m; 2559 int error; 2560 2561 m = *m_head; 2562 M_ASSERTPKTHDR(m); 2563 2564 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2565 if (txhdr == NULL) { 2566 m_freem(m); 2567 *m_head = NULL; 2568 return (ENOMEM); 2569 } 2570 2571 /* 2572 * Always use the non-mergeable header, regardless if mergable headers 2573 * were negotiated, because for transmit num_buffers is always zero. 2574 * The vtnet_hdr_size is used to enqueue the right header size segment. 2575 */ 2576 hdr = &txhdr->vth_uhdr.hdr; 2577 2578 if (m->m_flags & M_VLANTAG) { 2579 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2580 if ((*m_head = m) == NULL) { 2581 error = ENOBUFS; 2582 goto fail; 2583 } 2584 m->m_flags &= ~M_VLANTAG; 2585 } 2586 2587 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2588 m = vtnet_txq_offload(txq, m, hdr); 2589 if ((*m_head = m) == NULL) { 2590 error = ENOBUFS; 2591 goto fail; 2592 } 2593 } 2594 2595 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2596 fail: 2597 if (error) 2598 uma_zfree(vtnet_tx_header_zone, txhdr); 2599 2600 return (error); 2601 } 2602 2603 #ifdef VTNET_LEGACY_TX 2604 2605 static void 2606 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2607 { 2608 struct vtnet_softc *sc; 2609 struct virtqueue *vq; 2610 struct mbuf *m0; 2611 int tries, enq; 2612 2613 sc = txq->vtntx_sc; 2614 vq = txq->vtntx_vq; 2615 tries = 0; 2616 2617 VTNET_TXQ_LOCK_ASSERT(txq); 2618 2619 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2620 sc->vtnet_link_active == 0) 2621 return; 2622 2623 vtnet_txq_eof(txq); 2624 2625 again: 2626 enq = 0; 2627 2628 while (!if_sendq_empty(ifp)) { 2629 if (virtqueue_full(vq)) 2630 break; 2631 2632 m0 = if_dequeue(ifp); 2633 if (m0 == NULL) 2634 break; 2635 2636 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2637 if (m0 != NULL) 2638 if_sendq_prepend(ifp, m0); 2639 break; 2640 } 2641 2642 enq++; 2643 ETHER_BPF_MTAP(ifp, m0); 2644 } 2645 2646 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2647 if (tries++ < VTNET_NOTIFY_RETRIES) 2648 goto again; 2649 2650 txq->vtntx_stats.vtxs_rescheduled++; 2651 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2652 } 2653 } 2654 2655 static void 2656 vtnet_start(if_t ifp) 2657 { 2658 struct vtnet_softc *sc; 2659 struct vtnet_txq *txq; 2660 2661 sc = if_getsoftc(ifp); 2662 txq = &sc->vtnet_txqs[0]; 2663 2664 VTNET_TXQ_LOCK(txq); 2665 vtnet_start_locked(txq, ifp); 2666 VTNET_TXQ_UNLOCK(txq); 2667 } 2668 2669 #else /* !VTNET_LEGACY_TX */ 2670 2671 static int 2672 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2673 { 2674 struct vtnet_softc *sc; 2675 struct virtqueue *vq; 2676 struct buf_ring *br; 2677 if_t ifp; 2678 int enq, tries, error; 2679 2680 sc = txq->vtntx_sc; 2681 vq = txq->vtntx_vq; 2682 br = txq->vtntx_br; 2683 ifp = sc->vtnet_ifp; 2684 tries = 0; 2685 error = 0; 2686 2687 VTNET_TXQ_LOCK_ASSERT(txq); 2688 2689 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2690 sc->vtnet_link_active == 0) { 2691 if (m != NULL) 2692 error = drbr_enqueue(ifp, br, m); 2693 return (error); 2694 } 2695 2696 if (m != NULL) { 2697 error = drbr_enqueue(ifp, br, m); 2698 if (error) 2699 return (error); 2700 } 2701 2702 vtnet_txq_eof(txq); 2703 2704 again: 2705 enq = 0; 2706 2707 while ((m = drbr_peek(ifp, br)) != NULL) { 2708 if (virtqueue_full(vq)) { 2709 drbr_putback(ifp, br, m); 2710 break; 2711 } 2712 2713 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2714 if (m != NULL) 2715 drbr_putback(ifp, br, m); 2716 else 2717 drbr_advance(ifp, br); 2718 break; 2719 } 2720 drbr_advance(ifp, br); 2721 2722 enq++; 2723 ETHER_BPF_MTAP(ifp, m); 2724 } 2725 2726 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2727 if (tries++ < VTNET_NOTIFY_RETRIES) 2728 goto again; 2729 2730 txq->vtntx_stats.vtxs_rescheduled++; 2731 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2732 } 2733 2734 return (0); 2735 } 2736 2737 static int 2738 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2739 { 2740 struct vtnet_softc *sc; 2741 struct vtnet_txq *txq; 2742 int i, npairs, error; 2743 2744 sc = if_getsoftc(ifp); 2745 npairs = sc->vtnet_act_vq_pairs; 2746 2747 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2748 i = m->m_pkthdr.flowid % npairs; 2749 else 2750 i = curcpu % npairs; 2751 2752 txq = &sc->vtnet_txqs[i]; 2753 2754 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2755 error = vtnet_txq_mq_start_locked(txq, m); 2756 VTNET_TXQ_UNLOCK(txq); 2757 } else { 2758 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2759 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2760 } 2761 2762 return (error); 2763 } 2764 2765 static void 2766 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2767 { 2768 struct vtnet_softc *sc; 2769 struct vtnet_txq *txq; 2770 2771 txq = xtxq; 2772 sc = txq->vtntx_sc; 2773 2774 VTNET_TXQ_LOCK(txq); 2775 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2776 vtnet_txq_mq_start_locked(txq, NULL); 2777 VTNET_TXQ_UNLOCK(txq); 2778 } 2779 2780 #endif /* VTNET_LEGACY_TX */ 2781 2782 static void 2783 vtnet_txq_start(struct vtnet_txq *txq) 2784 { 2785 struct vtnet_softc *sc; 2786 if_t ifp; 2787 2788 sc = txq->vtntx_sc; 2789 ifp = sc->vtnet_ifp; 2790 2791 #ifdef VTNET_LEGACY_TX 2792 if (!if_sendq_empty(ifp)) 2793 vtnet_start_locked(txq, ifp); 2794 #else 2795 if (!drbr_empty(ifp, txq->vtntx_br)) 2796 vtnet_txq_mq_start_locked(txq, NULL); 2797 #endif 2798 } 2799 2800 static void 2801 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2802 { 2803 struct vtnet_softc *sc; 2804 struct vtnet_txq *txq; 2805 if_t ifp; 2806 2807 txq = xtxq; 2808 sc = txq->vtntx_sc; 2809 ifp = sc->vtnet_ifp; 2810 2811 VTNET_TXQ_LOCK(txq); 2812 2813 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2814 VTNET_TXQ_UNLOCK(txq); 2815 return; 2816 } 2817 2818 vtnet_txq_eof(txq); 2819 vtnet_txq_start(txq); 2820 2821 VTNET_TXQ_UNLOCK(txq); 2822 } 2823 2824 static int 2825 vtnet_txq_eof(struct vtnet_txq *txq) 2826 { 2827 struct virtqueue *vq; 2828 struct vtnet_tx_header *txhdr; 2829 struct mbuf *m; 2830 int deq; 2831 2832 vq = txq->vtntx_vq; 2833 deq = 0; 2834 VTNET_TXQ_LOCK_ASSERT(txq); 2835 2836 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2837 m = txhdr->vth_mbuf; 2838 deq++; 2839 2840 txq->vtntx_stats.vtxs_opackets++; 2841 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2842 if (m->m_flags & M_MCAST) 2843 txq->vtntx_stats.vtxs_omcasts++; 2844 2845 m_freem(m); 2846 uma_zfree(vtnet_tx_header_zone, txhdr); 2847 } 2848 2849 if (virtqueue_empty(vq)) 2850 txq->vtntx_watchdog = 0; 2851 2852 return (deq); 2853 } 2854 2855 static void 2856 vtnet_tx_vq_intr(void *xtxq) 2857 { 2858 struct vtnet_softc *sc; 2859 struct vtnet_txq *txq; 2860 if_t ifp; 2861 2862 txq = xtxq; 2863 sc = txq->vtntx_sc; 2864 ifp = sc->vtnet_ifp; 2865 2866 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2867 /* 2868 * Ignore this interrupt. Either this is a spurious interrupt 2869 * or multiqueue without per-VQ MSIX so every queue needs to 2870 * be polled (a brain dead configuration we could try harder 2871 * to avoid). 2872 */ 2873 vtnet_txq_disable_intr(txq); 2874 return; 2875 } 2876 2877 #ifdef DEV_NETMAP 2878 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2879 return; 2880 #endif /* DEV_NETMAP */ 2881 2882 VTNET_TXQ_LOCK(txq); 2883 2884 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2885 VTNET_TXQ_UNLOCK(txq); 2886 return; 2887 } 2888 2889 vtnet_txq_eof(txq); 2890 vtnet_txq_start(txq); 2891 2892 VTNET_TXQ_UNLOCK(txq); 2893 } 2894 2895 static void 2896 vtnet_tx_start_all(struct vtnet_softc *sc) 2897 { 2898 struct vtnet_txq *txq; 2899 int i; 2900 2901 VTNET_CORE_LOCK_ASSERT(sc); 2902 2903 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2904 txq = &sc->vtnet_txqs[i]; 2905 2906 VTNET_TXQ_LOCK(txq); 2907 vtnet_txq_start(txq); 2908 VTNET_TXQ_UNLOCK(txq); 2909 } 2910 } 2911 2912 #ifndef VTNET_LEGACY_TX 2913 static void 2914 vtnet_qflush(if_t ifp) 2915 { 2916 struct vtnet_softc *sc; 2917 struct vtnet_txq *txq; 2918 struct mbuf *m; 2919 int i; 2920 2921 sc = if_getsoftc(ifp); 2922 2923 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2924 txq = &sc->vtnet_txqs[i]; 2925 2926 VTNET_TXQ_LOCK(txq); 2927 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2928 m_freem(m); 2929 VTNET_TXQ_UNLOCK(txq); 2930 } 2931 2932 if_qflush(ifp); 2933 } 2934 #endif 2935 2936 static int 2937 vtnet_watchdog(struct vtnet_txq *txq) 2938 { 2939 if_t ifp; 2940 2941 ifp = txq->vtntx_sc->vtnet_ifp; 2942 2943 VTNET_TXQ_LOCK(txq); 2944 if (txq->vtntx_watchdog == 1) { 2945 /* 2946 * Only drain completed frames if the watchdog is about to 2947 * expire. If any frames were drained, there may be enough 2948 * free descriptors now available to transmit queued frames. 2949 * In that case, the timer will immediately be decremented 2950 * below, but the timeout is generous enough that should not 2951 * be a problem. 2952 */ 2953 if (vtnet_txq_eof(txq) != 0) 2954 vtnet_txq_start(txq); 2955 } 2956 2957 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2958 VTNET_TXQ_UNLOCK(txq); 2959 return (0); 2960 } 2961 VTNET_TXQ_UNLOCK(txq); 2962 2963 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2964 return (1); 2965 } 2966 2967 static void 2968 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2969 struct vtnet_txq_stats *txacc) 2970 { 2971 2972 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2973 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2974 2975 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2976 struct vtnet_rxq_stats *rxst; 2977 struct vtnet_txq_stats *txst; 2978 2979 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2980 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2981 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2982 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2983 rxacc->vrxs_csum += rxst->vrxs_csum; 2984 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2985 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2986 2987 txst = &sc->vtnet_txqs[i].vtntx_stats; 2988 txacc->vtxs_opackets += txst->vtxs_opackets; 2989 txacc->vtxs_obytes += txst->vtxs_obytes; 2990 txacc->vtxs_csum += txst->vtxs_csum; 2991 txacc->vtxs_tso += txst->vtxs_tso; 2992 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2993 } 2994 } 2995 2996 static uint64_t 2997 vtnet_get_counter(if_t ifp, ift_counter cnt) 2998 { 2999 struct vtnet_softc *sc; 3000 struct vtnet_rxq_stats rxaccum; 3001 struct vtnet_txq_stats txaccum; 3002 3003 sc = if_getsoftc(ifp); 3004 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3005 3006 switch (cnt) { 3007 case IFCOUNTER_IPACKETS: 3008 return (rxaccum.vrxs_ipackets); 3009 case IFCOUNTER_IQDROPS: 3010 return (rxaccum.vrxs_iqdrops); 3011 case IFCOUNTER_IERRORS: 3012 return (rxaccum.vrxs_ierrors); 3013 case IFCOUNTER_OPACKETS: 3014 return (txaccum.vtxs_opackets); 3015 #ifndef VTNET_LEGACY_TX 3016 case IFCOUNTER_OBYTES: 3017 return (txaccum.vtxs_obytes); 3018 case IFCOUNTER_OMCASTS: 3019 return (txaccum.vtxs_omcasts); 3020 #endif 3021 default: 3022 return (if_get_counter_default(ifp, cnt)); 3023 } 3024 } 3025 3026 static void 3027 vtnet_tick(void *xsc) 3028 { 3029 struct vtnet_softc *sc; 3030 if_t ifp; 3031 int i, timedout; 3032 3033 sc = xsc; 3034 ifp = sc->vtnet_ifp; 3035 timedout = 0; 3036 3037 VTNET_CORE_LOCK_ASSERT(sc); 3038 3039 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3040 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3041 3042 if (timedout != 0) { 3043 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3044 vtnet_init_locked(sc, 0); 3045 } else 3046 callout_schedule(&sc->vtnet_tick_ch, hz); 3047 } 3048 3049 static void 3050 vtnet_start_taskqueues(struct vtnet_softc *sc) 3051 { 3052 device_t dev; 3053 struct vtnet_rxq *rxq; 3054 struct vtnet_txq *txq; 3055 int i, error; 3056 3057 dev = sc->vtnet_dev; 3058 3059 /* 3060 * Errors here are very difficult to recover from - we cannot 3061 * easily fail because, if this is during boot, we will hang 3062 * when freeing any successfully started taskqueues because 3063 * the scheduler isn't up yet. 3064 * 3065 * Most drivers just ignore the return value - it only fails 3066 * with ENOMEM so an error is not likely. 3067 */ 3068 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3069 rxq = &sc->vtnet_rxqs[i]; 3070 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3071 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3072 if (error) { 3073 device_printf(dev, "failed to start rx taskq %d\n", 3074 rxq->vtnrx_id); 3075 } 3076 3077 txq = &sc->vtnet_txqs[i]; 3078 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3079 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3080 if (error) { 3081 device_printf(dev, "failed to start tx taskq %d\n", 3082 txq->vtntx_id); 3083 } 3084 } 3085 } 3086 3087 static void 3088 vtnet_free_taskqueues(struct vtnet_softc *sc) 3089 { 3090 struct vtnet_rxq *rxq; 3091 struct vtnet_txq *txq; 3092 int i; 3093 3094 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3095 rxq = &sc->vtnet_rxqs[i]; 3096 if (rxq->vtnrx_tq != NULL) { 3097 taskqueue_free(rxq->vtnrx_tq); 3098 rxq->vtnrx_tq = NULL; 3099 } 3100 3101 txq = &sc->vtnet_txqs[i]; 3102 if (txq->vtntx_tq != NULL) { 3103 taskqueue_free(txq->vtntx_tq); 3104 txq->vtntx_tq = NULL; 3105 } 3106 } 3107 } 3108 3109 static void 3110 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3111 { 3112 struct vtnet_rxq *rxq; 3113 struct vtnet_txq *txq; 3114 int i; 3115 3116 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3117 rxq = &sc->vtnet_rxqs[i]; 3118 if (rxq->vtnrx_tq != NULL) 3119 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3120 3121 txq = &sc->vtnet_txqs[i]; 3122 if (txq->vtntx_tq != NULL) { 3123 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3124 #ifndef VTNET_LEGACY_TX 3125 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3126 #endif 3127 } 3128 } 3129 } 3130 3131 static void 3132 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3133 { 3134 struct vtnet_rxq *rxq; 3135 struct vtnet_txq *txq; 3136 int i; 3137 3138 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3139 rxq = &sc->vtnet_rxqs[i]; 3140 vtnet_rxq_free_mbufs(rxq); 3141 3142 txq = &sc->vtnet_txqs[i]; 3143 vtnet_txq_free_mbufs(txq); 3144 } 3145 } 3146 3147 static void 3148 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3149 { 3150 struct vtnet_rxq *rxq; 3151 struct vtnet_txq *txq; 3152 int i; 3153 3154 VTNET_CORE_LOCK_ASSERT(sc); 3155 3156 /* 3157 * Lock and unlock the per-queue mutex so we known the stop 3158 * state is visible. Doing only the active queues should be 3159 * sufficient, but it does not cost much extra to do all the 3160 * queues. 3161 */ 3162 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3163 rxq = &sc->vtnet_rxqs[i]; 3164 VTNET_RXQ_LOCK(rxq); 3165 VTNET_RXQ_UNLOCK(rxq); 3166 3167 txq = &sc->vtnet_txqs[i]; 3168 VTNET_TXQ_LOCK(txq); 3169 VTNET_TXQ_UNLOCK(txq); 3170 } 3171 } 3172 3173 static void 3174 vtnet_stop(struct vtnet_softc *sc) 3175 { 3176 device_t dev; 3177 if_t ifp; 3178 3179 dev = sc->vtnet_dev; 3180 ifp = sc->vtnet_ifp; 3181 3182 VTNET_CORE_LOCK_ASSERT(sc); 3183 3184 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3185 sc->vtnet_link_active = 0; 3186 callout_stop(&sc->vtnet_tick_ch); 3187 3188 /* Only advisory. */ 3189 vtnet_disable_interrupts(sc); 3190 3191 #ifdef DEV_NETMAP 3192 /* Stop any pending txsync/rxsync and disable them. */ 3193 netmap_disable_all_rings(ifp); 3194 #endif /* DEV_NETMAP */ 3195 3196 /* 3197 * Stop the host adapter. This resets it to the pre-initialized 3198 * state. It will not generate any interrupts until after it is 3199 * reinitialized. 3200 */ 3201 virtio_stop(dev); 3202 vtnet_stop_rendezvous(sc); 3203 3204 vtnet_drain_rxtx_queues(sc); 3205 sc->vtnet_act_vq_pairs = 1; 3206 } 3207 3208 static int 3209 vtnet_virtio_reinit(struct vtnet_softc *sc) 3210 { 3211 device_t dev; 3212 if_t ifp; 3213 uint64_t features; 3214 int error; 3215 3216 dev = sc->vtnet_dev; 3217 ifp = sc->vtnet_ifp; 3218 features = sc->vtnet_negotiated_features; 3219 3220 /* 3221 * Re-negotiate with the host, removing any disabled receive 3222 * features. Transmit features are disabled only on our side 3223 * via if_capenable and if_hwassist. 3224 */ 3225 3226 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3227 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3228 3229 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3230 features &= ~VTNET_LRO_FEATURES; 3231 3232 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3233 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3234 3235 error = virtio_reinit(dev, features); 3236 if (error) { 3237 device_printf(dev, "virtio reinit error %d\n", error); 3238 return (error); 3239 } 3240 3241 sc->vtnet_features = features; 3242 virtio_reinit_complete(dev); 3243 3244 return (0); 3245 } 3246 3247 static void 3248 vtnet_init_rx_filters(struct vtnet_softc *sc) 3249 { 3250 if_t ifp; 3251 3252 ifp = sc->vtnet_ifp; 3253 3254 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3255 vtnet_rx_filter(sc); 3256 vtnet_rx_filter_mac(sc); 3257 } 3258 3259 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3260 vtnet_rx_filter_vlan(sc); 3261 } 3262 3263 static int 3264 vtnet_init_rx_queues(struct vtnet_softc *sc) 3265 { 3266 device_t dev; 3267 if_t ifp; 3268 struct vtnet_rxq *rxq; 3269 int i, clustersz, error; 3270 3271 dev = sc->vtnet_dev; 3272 ifp = sc->vtnet_ifp; 3273 3274 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3275 sc->vtnet_rx_clustersz = clustersz; 3276 3277 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3278 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3279 VTNET_MAX_RX_SIZE, clustersz); 3280 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3281 ("%s: too many rx mbufs %d for %d segments", __func__, 3282 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3283 } else 3284 sc->vtnet_rx_nmbufs = 1; 3285 3286 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3287 rxq = &sc->vtnet_rxqs[i]; 3288 3289 /* Hold the lock to satisfy asserts. */ 3290 VTNET_RXQ_LOCK(rxq); 3291 error = vtnet_rxq_populate(rxq); 3292 VTNET_RXQ_UNLOCK(rxq); 3293 3294 if (error) { 3295 device_printf(dev, "cannot populate Rx queue %d\n", i); 3296 return (error); 3297 } 3298 } 3299 3300 return (0); 3301 } 3302 3303 static int 3304 vtnet_init_tx_queues(struct vtnet_softc *sc) 3305 { 3306 struct vtnet_txq *txq; 3307 int i; 3308 3309 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3310 txq = &sc->vtnet_txqs[i]; 3311 txq->vtntx_watchdog = 0; 3312 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3313 #ifdef DEV_NETMAP 3314 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3315 #endif /* DEV_NETMAP */ 3316 } 3317 3318 return (0); 3319 } 3320 3321 static int 3322 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3323 { 3324 int error; 3325 3326 error = vtnet_init_rx_queues(sc); 3327 if (error) 3328 return (error); 3329 3330 error = vtnet_init_tx_queues(sc); 3331 if (error) 3332 return (error); 3333 3334 return (0); 3335 } 3336 3337 static void 3338 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3339 { 3340 device_t dev; 3341 int npairs; 3342 3343 dev = sc->vtnet_dev; 3344 3345 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3346 sc->vtnet_act_vq_pairs = 1; 3347 return; 3348 } 3349 3350 npairs = sc->vtnet_req_vq_pairs; 3351 3352 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3353 device_printf(dev, "cannot set active queue pairs to %d, " 3354 "falling back to 1 queue pair\n", npairs); 3355 npairs = 1; 3356 } 3357 3358 sc->vtnet_act_vq_pairs = npairs; 3359 } 3360 3361 static void 3362 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3363 { 3364 if_t ifp; 3365 uint64_t features; 3366 int error; 3367 3368 ifp = sc->vtnet_ifp; 3369 features = sc->vtnet_features; 3370 3371 VTNET_CORE_LOCK_ASSERT(sc); 3372 3373 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3374 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3375 features |= VIRTIO_NET_F_GUEST_CSUM; 3376 else 3377 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3378 } 3379 3380 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3381 if (if_getcapenable(ifp) & IFCAP_LRO) 3382 features |= VTNET_LRO_FEATURES; 3383 else 3384 features &= ~VTNET_LRO_FEATURES; 3385 } 3386 3387 error = vtnet_ctrl_guest_offloads(sc, 3388 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3389 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3390 VIRTIO_NET_F_GUEST_UFO)); 3391 if (error) { 3392 device_printf(sc->vtnet_dev, 3393 "%s: cannot update Rx features\n", __func__); 3394 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3395 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3396 vtnet_init_locked(sc, 0); 3397 } 3398 } else 3399 sc->vtnet_features = features; 3400 } 3401 3402 static int 3403 vtnet_reinit(struct vtnet_softc *sc) 3404 { 3405 if_t ifp; 3406 int error; 3407 3408 ifp = sc->vtnet_ifp; 3409 3410 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3411 3412 error = vtnet_virtio_reinit(sc); 3413 if (error) 3414 return (error); 3415 3416 vtnet_set_macaddr(sc); 3417 vtnet_set_active_vq_pairs(sc); 3418 3419 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3420 vtnet_init_rx_filters(sc); 3421 3422 if_sethwassist(ifp, 0); 3423 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3424 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3425 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3426 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3427 if (if_getcapenable(ifp) & IFCAP_TSO4) 3428 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3429 if (if_getcapenable(ifp) & IFCAP_TSO6) 3430 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3431 3432 error = vtnet_init_rxtx_queues(sc); 3433 if (error) 3434 return (error); 3435 3436 return (0); 3437 } 3438 3439 static void 3440 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3441 { 3442 if_t ifp; 3443 3444 ifp = sc->vtnet_ifp; 3445 3446 VTNET_CORE_LOCK_ASSERT(sc); 3447 3448 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3449 return; 3450 3451 vtnet_stop(sc); 3452 3453 #ifdef DEV_NETMAP 3454 /* Once stopped we can update the netmap flags, if necessary. */ 3455 switch (init_mode) { 3456 case VTNET_INIT_NETMAP_ENTER: 3457 nm_set_native_flags(NA(ifp)); 3458 break; 3459 case VTNET_INIT_NETMAP_EXIT: 3460 nm_clear_native_flags(NA(ifp)); 3461 break; 3462 } 3463 #endif /* DEV_NETMAP */ 3464 3465 if (vtnet_reinit(sc) != 0) { 3466 vtnet_stop(sc); 3467 return; 3468 } 3469 3470 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3471 vtnet_update_link_status(sc); 3472 vtnet_enable_interrupts(sc); 3473 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3474 3475 #ifdef DEV_NETMAP 3476 /* Re-enable txsync/rxsync. */ 3477 netmap_enable_all_rings(ifp); 3478 #endif /* DEV_NETMAP */ 3479 } 3480 3481 static void 3482 vtnet_init(void *xsc) 3483 { 3484 struct vtnet_softc *sc; 3485 3486 sc = xsc; 3487 3488 VTNET_CORE_LOCK(sc); 3489 vtnet_init_locked(sc, 0); 3490 VTNET_CORE_UNLOCK(sc); 3491 } 3492 3493 static void 3494 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3495 { 3496 3497 /* 3498 * The control virtqueue is only polled and therefore it should 3499 * already be empty. 3500 */ 3501 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3502 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3503 } 3504 3505 static void 3506 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3507 struct sglist *sg, int readable, int writable) 3508 { 3509 struct virtqueue *vq; 3510 3511 vq = sc->vtnet_ctrl_vq; 3512 3513 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3514 VTNET_CORE_LOCK_ASSERT(sc); 3515 3516 if (!virtqueue_empty(vq)) 3517 return; 3518 3519 /* 3520 * Poll for the response, but the command is likely completed before 3521 * returning from the notify. 3522 */ 3523 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3524 virtqueue_notify(vq); 3525 virtqueue_poll(vq, NULL); 3526 } 3527 } 3528 3529 static int 3530 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3531 { 3532 struct sglist_seg segs[3]; 3533 struct sglist sg; 3534 struct { 3535 struct virtio_net_ctrl_hdr hdr __aligned(2); 3536 uint8_t pad1; 3537 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3538 uint8_t pad2; 3539 uint8_t ack; 3540 } s; 3541 int error; 3542 3543 error = 0; 3544 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3545 3546 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3547 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3548 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3549 s.ack = VIRTIO_NET_ERR; 3550 3551 sglist_init(&sg, nitems(segs), segs); 3552 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3553 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3554 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3555 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3556 3557 if (error == 0) 3558 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3559 3560 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3561 } 3562 3563 static int 3564 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3565 { 3566 struct sglist_seg segs[3]; 3567 struct sglist sg; 3568 struct { 3569 struct virtio_net_ctrl_hdr hdr __aligned(2); 3570 uint8_t pad1; 3571 uint64_t offloads __aligned(8); 3572 uint8_t pad2; 3573 uint8_t ack; 3574 } s; 3575 int error; 3576 3577 error = 0; 3578 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3579 3580 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3581 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3582 s.offloads = vtnet_gtoh64(sc, offloads); 3583 s.ack = VIRTIO_NET_ERR; 3584 3585 sglist_init(&sg, nitems(segs), segs); 3586 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3587 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3588 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3589 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3590 3591 if (error == 0) 3592 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3593 3594 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3595 } 3596 3597 static int 3598 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3599 { 3600 struct sglist_seg segs[3]; 3601 struct sglist sg; 3602 struct { 3603 struct virtio_net_ctrl_hdr hdr __aligned(2); 3604 uint8_t pad1; 3605 struct virtio_net_ctrl_mq mq __aligned(2); 3606 uint8_t pad2; 3607 uint8_t ack; 3608 } s; 3609 int error; 3610 3611 error = 0; 3612 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3613 3614 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3615 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3616 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3617 s.ack = VIRTIO_NET_ERR; 3618 3619 sglist_init(&sg, nitems(segs), segs); 3620 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3621 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3622 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3623 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3624 3625 if (error == 0) 3626 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3627 3628 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3629 } 3630 3631 static int 3632 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3633 { 3634 struct sglist_seg segs[3]; 3635 struct sglist sg; 3636 struct { 3637 struct virtio_net_ctrl_hdr hdr __aligned(2); 3638 uint8_t pad1; 3639 uint8_t onoff; 3640 uint8_t pad2; 3641 uint8_t ack; 3642 } s; 3643 int error; 3644 3645 error = 0; 3646 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3647 3648 s.hdr.class = VIRTIO_NET_CTRL_RX; 3649 s.hdr.cmd = cmd; 3650 s.onoff = on; 3651 s.ack = VIRTIO_NET_ERR; 3652 3653 sglist_init(&sg, nitems(segs), segs); 3654 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3655 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3656 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3657 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3658 3659 if (error == 0) 3660 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3661 3662 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3663 } 3664 3665 static int 3666 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3667 { 3668 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3669 } 3670 3671 static int 3672 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3673 { 3674 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3675 } 3676 3677 static void 3678 vtnet_rx_filter(struct vtnet_softc *sc) 3679 { 3680 device_t dev; 3681 if_t ifp; 3682 3683 dev = sc->vtnet_dev; 3684 ifp = sc->vtnet_ifp; 3685 3686 VTNET_CORE_LOCK_ASSERT(sc); 3687 3688 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3689 device_printf(dev, "cannot %s promiscuous mode\n", 3690 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3691 } 3692 3693 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3694 device_printf(dev, "cannot %s all-multicast mode\n", 3695 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3696 } 3697 } 3698 3699 static u_int 3700 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3701 { 3702 struct vtnet_softc *sc = arg; 3703 3704 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3705 return (0); 3706 3707 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3708 bcopy(LLADDR(sdl), 3709 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3710 ETHER_ADDR_LEN); 3711 3712 return (1); 3713 } 3714 3715 static u_int 3716 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3717 { 3718 struct vtnet_mac_filter *filter = arg; 3719 3720 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3721 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3722 ETHER_ADDR_LEN); 3723 3724 return (1); 3725 } 3726 3727 static void 3728 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3729 { 3730 struct virtio_net_ctrl_hdr hdr __aligned(2); 3731 struct vtnet_mac_filter *filter; 3732 struct sglist_seg segs[4]; 3733 struct sglist sg; 3734 if_t ifp; 3735 bool promisc, allmulti; 3736 u_int ucnt, mcnt; 3737 int error; 3738 uint8_t ack; 3739 3740 ifp = sc->vtnet_ifp; 3741 filter = sc->vtnet_mac_filter; 3742 error = 0; 3743 3744 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3745 VTNET_CORE_LOCK_ASSERT(sc); 3746 3747 /* Unicast MAC addresses: */ 3748 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3749 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3750 3751 if (promisc) { 3752 ucnt = 0; 3753 if_printf(ifp, "more than %d MAC addresses assigned, " 3754 "falling back to promiscuous mode\n", 3755 VTNET_MAX_MAC_ENTRIES); 3756 } 3757 3758 /* Multicast MAC addresses: */ 3759 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3760 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3761 3762 if (allmulti) { 3763 mcnt = 0; 3764 if_printf(ifp, "more than %d multicast MAC addresses " 3765 "assigned, falling back to all-multicast mode\n", 3766 VTNET_MAX_MAC_ENTRIES); 3767 } 3768 3769 if (promisc && allmulti) 3770 goto out; 3771 3772 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3773 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3774 3775 hdr.class = VIRTIO_NET_CTRL_MAC; 3776 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3777 ack = VIRTIO_NET_ERR; 3778 3779 sglist_init(&sg, nitems(segs), segs); 3780 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3781 error |= sglist_append(&sg, &filter->vmf_unicast, 3782 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3783 error |= sglist_append(&sg, &filter->vmf_multicast, 3784 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3785 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3786 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3787 3788 if (error == 0) 3789 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3790 if (ack != VIRTIO_NET_OK) 3791 if_printf(ifp, "error setting host MAC filter table\n"); 3792 3793 out: 3794 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3795 if_printf(ifp, "cannot enable promiscuous mode\n"); 3796 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3797 if_printf(ifp, "cannot enable all-multicast mode\n"); 3798 } 3799 3800 static int 3801 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3802 { 3803 struct sglist_seg segs[3]; 3804 struct sglist sg; 3805 struct { 3806 struct virtio_net_ctrl_hdr hdr __aligned(2); 3807 uint8_t pad1; 3808 uint16_t tag __aligned(2); 3809 uint8_t pad2; 3810 uint8_t ack; 3811 } s; 3812 int error; 3813 3814 error = 0; 3815 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3816 3817 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3818 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3819 s.tag = vtnet_gtoh16(sc, tag); 3820 s.ack = VIRTIO_NET_ERR; 3821 3822 sglist_init(&sg, nitems(segs), segs); 3823 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3824 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3825 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3826 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3827 3828 if (error == 0) 3829 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3830 3831 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3832 } 3833 3834 static void 3835 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3836 { 3837 int i, bit; 3838 uint32_t w; 3839 uint16_t tag; 3840 3841 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3842 VTNET_CORE_LOCK_ASSERT(sc); 3843 3844 /* Enable the filter for each configured VLAN. */ 3845 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3846 w = sc->vtnet_vlan_filter[i]; 3847 3848 while ((bit = ffs(w) - 1) != -1) { 3849 w &= ~(1 << bit); 3850 tag = sizeof(w) * CHAR_BIT * i + bit; 3851 3852 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3853 device_printf(sc->vtnet_dev, 3854 "cannot enable VLAN %d filter\n", tag); 3855 } 3856 } 3857 } 3858 } 3859 3860 static void 3861 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3862 { 3863 if_t ifp; 3864 int idx, bit; 3865 3866 ifp = sc->vtnet_ifp; 3867 idx = (tag >> 5) & 0x7F; 3868 bit = tag & 0x1F; 3869 3870 if (tag == 0 || tag > 4095) 3871 return; 3872 3873 VTNET_CORE_LOCK(sc); 3874 3875 if (add) 3876 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3877 else 3878 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3879 3880 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3881 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3882 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3883 device_printf(sc->vtnet_dev, 3884 "cannot %s VLAN %d %s the host filter table\n", 3885 add ? "add" : "remove", tag, add ? "to" : "from"); 3886 } 3887 3888 VTNET_CORE_UNLOCK(sc); 3889 } 3890 3891 static void 3892 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3893 { 3894 3895 if (if_getsoftc(ifp) != arg) 3896 return; 3897 3898 vtnet_update_vlan_filter(arg, 1, tag); 3899 } 3900 3901 static void 3902 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3903 { 3904 3905 if (if_getsoftc(ifp) != arg) 3906 return; 3907 3908 vtnet_update_vlan_filter(arg, 0, tag); 3909 } 3910 3911 static void 3912 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3913 { 3914 if_t ifp; 3915 uint32_t speed; 3916 3917 ifp = sc->vtnet_ifp; 3918 3919 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3920 return; 3921 3922 /* BMV: Ignore duplex. */ 3923 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3924 offsetof(struct virtio_net_config, speed)); 3925 if (speed != UINT32_MAX) 3926 if_setbaudrate(ifp, IF_Mbps(speed)); 3927 } 3928 3929 static int 3930 vtnet_is_link_up(struct vtnet_softc *sc) 3931 { 3932 uint16_t status; 3933 3934 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3935 return (1); 3936 3937 status = virtio_read_dev_config_2(sc->vtnet_dev, 3938 offsetof(struct virtio_net_config, status)); 3939 3940 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3941 } 3942 3943 static void 3944 vtnet_update_link_status(struct vtnet_softc *sc) 3945 { 3946 if_t ifp; 3947 int link; 3948 3949 ifp = sc->vtnet_ifp; 3950 VTNET_CORE_LOCK_ASSERT(sc); 3951 link = vtnet_is_link_up(sc); 3952 3953 /* Notify if the link status has changed. */ 3954 if (link != 0 && sc->vtnet_link_active == 0) { 3955 vtnet_update_speed_duplex(sc); 3956 sc->vtnet_link_active = 1; 3957 if_link_state_change(ifp, LINK_STATE_UP); 3958 } else if (link == 0 && sc->vtnet_link_active != 0) { 3959 sc->vtnet_link_active = 0; 3960 if_link_state_change(ifp, LINK_STATE_DOWN); 3961 } 3962 } 3963 3964 static int 3965 vtnet_ifmedia_upd(if_t ifp __unused) 3966 { 3967 return (EOPNOTSUPP); 3968 } 3969 3970 static void 3971 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 3972 { 3973 struct vtnet_softc *sc; 3974 3975 sc = if_getsoftc(ifp); 3976 3977 ifmr->ifm_status = IFM_AVALID; 3978 ifmr->ifm_active = IFM_ETHER; 3979 3980 VTNET_CORE_LOCK(sc); 3981 if (vtnet_is_link_up(sc) != 0) { 3982 ifmr->ifm_status |= IFM_ACTIVE; 3983 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3984 } else 3985 ifmr->ifm_active |= IFM_NONE; 3986 VTNET_CORE_UNLOCK(sc); 3987 } 3988 3989 static void 3990 vtnet_get_macaddr(struct vtnet_softc *sc) 3991 { 3992 3993 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3994 virtio_read_device_config_array(sc->vtnet_dev, 3995 offsetof(struct virtio_net_config, mac), 3996 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 3997 } else { 3998 /* Generate a random locally administered unicast address. */ 3999 sc->vtnet_hwaddr[0] = 0xB2; 4000 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4001 } 4002 } 4003 4004 static void 4005 vtnet_set_macaddr(struct vtnet_softc *sc) 4006 { 4007 device_t dev; 4008 int error; 4009 4010 dev = sc->vtnet_dev; 4011 4012 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4013 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4014 if (error) 4015 device_printf(dev, "unable to set MAC address\n"); 4016 return; 4017 } 4018 4019 /* MAC in config is read-only in modern VirtIO. */ 4020 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4021 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4022 virtio_write_dev_config_1(dev, 4023 offsetof(struct virtio_net_config, mac) + i, 4024 sc->vtnet_hwaddr[i]); 4025 } 4026 } 4027 } 4028 4029 static void 4030 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4031 { 4032 4033 /* Assign MAC address if it was generated. */ 4034 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4035 vtnet_set_macaddr(sc); 4036 } 4037 4038 static void 4039 vtnet_vlan_tag_remove(struct mbuf *m) 4040 { 4041 struct ether_vlan_header *evh; 4042 4043 evh = mtod(m, struct ether_vlan_header *); 4044 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4045 m->m_flags |= M_VLANTAG; 4046 4047 /* Strip the 802.1Q header. */ 4048 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4049 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4050 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4051 } 4052 4053 static void 4054 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4055 { 4056 int limit; 4057 4058 limit = vtnet_tunable_int(sc, "rx_process_limit", 4059 vtnet_rx_process_limit); 4060 if (limit < 0) 4061 limit = INT_MAX; 4062 sc->vtnet_rx_process_limit = limit; 4063 } 4064 4065 static void 4066 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4067 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4068 { 4069 struct sysctl_oid *node; 4070 struct sysctl_oid_list *list; 4071 struct vtnet_rxq_stats *stats; 4072 char namebuf[16]; 4073 4074 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4075 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4076 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4077 list = SYSCTL_CHILDREN(node); 4078 4079 stats = &rxq->vtnrx_stats; 4080 4081 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4082 &stats->vrxs_ipackets, "Receive packets"); 4083 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4084 &stats->vrxs_ibytes, "Receive bytes"); 4085 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4086 &stats->vrxs_iqdrops, "Receive drops"); 4087 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4088 &stats->vrxs_ierrors, "Receive errors"); 4089 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4090 &stats->vrxs_csum, "Receive checksum offloaded"); 4091 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4092 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4093 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4094 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4095 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4096 &stats->vrxs_rescheduled, 4097 "Receive interrupt handler rescheduled"); 4098 } 4099 4100 static void 4101 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4102 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4103 { 4104 struct sysctl_oid *node; 4105 struct sysctl_oid_list *list; 4106 struct vtnet_txq_stats *stats; 4107 char namebuf[16]; 4108 4109 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4110 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4111 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4112 list = SYSCTL_CHILDREN(node); 4113 4114 stats = &txq->vtntx_stats; 4115 4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4117 &stats->vtxs_opackets, "Transmit packets"); 4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4119 &stats->vtxs_obytes, "Transmit bytes"); 4120 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4121 &stats->vtxs_omcasts, "Transmit multicasts"); 4122 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4123 &stats->vtxs_csum, "Transmit checksum offloaded"); 4124 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4125 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4126 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4127 &stats->vtxs_rescheduled, 4128 "Transmit interrupt handler rescheduled"); 4129 } 4130 4131 static void 4132 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4133 { 4134 device_t dev; 4135 struct sysctl_ctx_list *ctx; 4136 struct sysctl_oid *tree; 4137 struct sysctl_oid_list *child; 4138 int i; 4139 4140 dev = sc->vtnet_dev; 4141 ctx = device_get_sysctl_ctx(dev); 4142 tree = device_get_sysctl_tree(dev); 4143 child = SYSCTL_CHILDREN(tree); 4144 4145 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4146 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4147 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4148 } 4149 } 4150 4151 static void 4152 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4153 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4154 { 4155 struct vtnet_statistics *stats; 4156 struct vtnet_rxq_stats rxaccum; 4157 struct vtnet_txq_stats txaccum; 4158 4159 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4160 4161 stats = &sc->vtnet_stats; 4162 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4163 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4164 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4165 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4166 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4167 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4168 4169 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4170 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4171 "Mbuf cluster allocation failures"); 4172 4173 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4174 CTLFLAG_RD, &stats->rx_frame_too_large, 4175 "Received frame larger than the mbuf chain"); 4176 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4177 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4178 "Enqueuing the replacement receive mbuf failed"); 4179 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4180 CTLFLAG_RD, &stats->rx_mergeable_failed, 4181 "Mergeable buffers receive failures"); 4182 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4183 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4184 "Received checksum offloaded buffer with unsupported " 4185 "Ethernet type"); 4186 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4187 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4188 "Received checksum offloaded buffer with incorrect IP protocol"); 4189 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4190 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4191 "Received checksum offloaded buffer with incorrect offset"); 4192 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4193 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4194 "Received checksum offloaded buffer with incorrect protocol"); 4195 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4196 CTLFLAG_RD, &stats->rx_csum_failed, 4197 "Received buffer checksum offload failed"); 4198 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4199 CTLFLAG_RD, &stats->rx_csum_offloaded, 4200 "Received buffer checksum offload succeeded"); 4201 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4202 CTLFLAG_RD, &stats->rx_task_rescheduled, 4203 "Times the receive interrupt task rescheduled itself"); 4204 4205 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4206 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4207 "Aborted transmit of checksum offloaded buffer with unknown " 4208 "Ethernet type"); 4209 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4210 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4211 "Aborted transmit of checksum offloaded buffer because mismatched " 4212 "protocols"); 4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4214 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4215 "Aborted transmit of TSO buffer with non TCP protocol"); 4216 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4217 CTLFLAG_RD, &stats->tx_tso_without_csum, 4218 "Aborted transmit of TSO buffer without TCP checksum offload"); 4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4220 CTLFLAG_RD, &stats->tx_defragged, 4221 "Transmit mbufs defragged"); 4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4223 CTLFLAG_RD, &stats->tx_defrag_failed, 4224 "Aborted transmit of buffer because defrag failed"); 4225 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4226 CTLFLAG_RD, &stats->tx_csum_offloaded, 4227 "Offloaded checksum of transmitted buffer"); 4228 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4229 CTLFLAG_RD, &stats->tx_tso_offloaded, 4230 "Segmentation offload of transmitted buffer"); 4231 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4232 CTLFLAG_RD, &stats->tx_task_rescheduled, 4233 "Times the transmit interrupt task rescheduled itself"); 4234 } 4235 4236 static void 4237 vtnet_setup_sysctl(struct vtnet_softc *sc) 4238 { 4239 device_t dev; 4240 struct sysctl_ctx_list *ctx; 4241 struct sysctl_oid *tree; 4242 struct sysctl_oid_list *child; 4243 4244 dev = sc->vtnet_dev; 4245 ctx = device_get_sysctl_ctx(dev); 4246 tree = device_get_sysctl_tree(dev); 4247 child = SYSCTL_CHILDREN(tree); 4248 4249 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4250 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4251 "Number of maximum supported virtqueue pairs"); 4252 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4253 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4254 "Number of requested virtqueue pairs"); 4255 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4256 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4257 "Number of active virtqueue pairs"); 4258 4259 vtnet_setup_stat_sysctl(ctx, child, sc); 4260 } 4261 4262 static void 4263 vtnet_load_tunables(struct vtnet_softc *sc) 4264 { 4265 4266 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4267 "lro_entry_count", vtnet_lro_entry_count); 4268 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4269 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4270 4271 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4272 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4273 } 4274 4275 static int 4276 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4277 { 4278 4279 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4280 } 4281 4282 static void 4283 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4284 { 4285 4286 virtqueue_disable_intr(rxq->vtnrx_vq); 4287 } 4288 4289 static int 4290 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4291 { 4292 struct virtqueue *vq; 4293 4294 vq = txq->vtntx_vq; 4295 4296 if (vtnet_txq_below_threshold(txq) != 0) 4297 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4298 4299 /* 4300 * The free count is above our threshold. Keep the Tx interrupt 4301 * disabled until the queue is fuller. 4302 */ 4303 return (0); 4304 } 4305 4306 static void 4307 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4308 { 4309 4310 virtqueue_disable_intr(txq->vtntx_vq); 4311 } 4312 4313 static void 4314 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4315 { 4316 struct vtnet_rxq *rxq; 4317 int i; 4318 4319 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4320 rxq = &sc->vtnet_rxqs[i]; 4321 if (vtnet_rxq_enable_intr(rxq) != 0) 4322 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4323 } 4324 } 4325 4326 static void 4327 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4328 { 4329 int i; 4330 4331 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4332 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4333 } 4334 4335 static void 4336 vtnet_enable_interrupts(struct vtnet_softc *sc) 4337 { 4338 4339 vtnet_enable_rx_interrupts(sc); 4340 vtnet_enable_tx_interrupts(sc); 4341 } 4342 4343 static void 4344 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4345 { 4346 int i; 4347 4348 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4349 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4350 } 4351 4352 static void 4353 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4354 { 4355 int i; 4356 4357 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4358 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4359 } 4360 4361 static void 4362 vtnet_disable_interrupts(struct vtnet_softc *sc) 4363 { 4364 4365 vtnet_disable_rx_interrupts(sc); 4366 vtnet_disable_tx_interrupts(sc); 4367 } 4368 4369 static int 4370 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4371 { 4372 char path[64]; 4373 4374 snprintf(path, sizeof(path), 4375 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4376 TUNABLE_INT_FETCH(path, &def); 4377 4378 return (def); 4379 } 4380 4381 #ifdef DEBUGNET 4382 static void 4383 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4384 { 4385 struct vtnet_softc *sc; 4386 4387 sc = if_getsoftc(ifp); 4388 4389 VTNET_CORE_LOCK(sc); 4390 *nrxr = sc->vtnet_req_vq_pairs; 4391 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4392 *clsize = sc->vtnet_rx_clustersz; 4393 VTNET_CORE_UNLOCK(sc); 4394 } 4395 4396 static void 4397 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4398 { 4399 struct vtnet_softc *sc; 4400 static bool sw_lro_enabled = false; 4401 4402 /* 4403 * Disable software LRO, since it would require entering the network 4404 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4405 */ 4406 sc = if_getsoftc(ifp); 4407 switch (event) { 4408 case DEBUGNET_START: 4409 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4410 if (sw_lro_enabled) 4411 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4412 break; 4413 case DEBUGNET_END: 4414 if (sw_lro_enabled) 4415 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4416 break; 4417 } 4418 } 4419 4420 static int 4421 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4422 { 4423 struct vtnet_softc *sc; 4424 struct vtnet_txq *txq; 4425 int error; 4426 4427 sc = if_getsoftc(ifp); 4428 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4429 IFF_DRV_RUNNING) 4430 return (EBUSY); 4431 4432 txq = &sc->vtnet_txqs[0]; 4433 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4434 if (error == 0) 4435 (void)vtnet_txq_notify(txq); 4436 return (error); 4437 } 4438 4439 static int 4440 vtnet_debugnet_poll(if_t ifp, int count) 4441 { 4442 struct vtnet_softc *sc; 4443 int i; 4444 4445 sc = if_getsoftc(ifp); 4446 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4447 IFF_DRV_RUNNING) 4448 return (EBUSY); 4449 4450 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4451 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4452 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4453 return (0); 4454 } 4455 #endif /* DEBUGNET */ 4456