1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 32 #include <sys/eventhandler.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/sockio.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/module.h> 39 #include <sys/msan.h> 40 #include <sys/socket.h> 41 #include <sys/sysctl.h> 42 #include <sys/random.h> 43 #include <sys/sglist.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/taskqueue.h> 47 #include <sys/smp.h> 48 #include <machine/smp.h> 49 50 #include <vm/uma.h> 51 52 #include <net/debugnet.h> 53 #include <net/ethernet.h> 54 #include <net/pfil.h> 55 #include <net/if.h> 56 #include <net/if_var.h> 57 #include <net/if_arp.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/if_media.h> 61 #include <net/if_vlan_var.h> 62 63 #include <net/bpf.h> 64 65 #include <netinet/in_systm.h> 66 #include <netinet/in.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #include <netinet/udp.h> 71 #include <netinet/tcp.h> 72 #include <netinet/tcp_lro.h> 73 74 #include <machine/bus.h> 75 #include <machine/resource.h> 76 #include <sys/bus.h> 77 #include <sys/rman.h> 78 79 #include <dev/virtio/virtio.h> 80 #include <dev/virtio/virtqueue.h> 81 #include <dev/virtio/network/virtio_net.h> 82 #include <dev/virtio/network/if_vtnetvar.h> 83 #include "virtio_if.h" 84 85 #include "opt_inet.h" 86 #include "opt_inet6.h" 87 88 #if defined(INET) || defined(INET6) 89 #include <machine/in_cksum.h> 90 #endif 91 92 static int vtnet_modevent(module_t, int, void *); 93 94 static int vtnet_probe(device_t); 95 static int vtnet_attach(device_t); 96 static int vtnet_detach(device_t); 97 static int vtnet_suspend(device_t); 98 static int vtnet_resume(device_t); 99 static int vtnet_shutdown(device_t); 100 static int vtnet_attach_completed(device_t); 101 static int vtnet_config_change(device_t); 102 103 static int vtnet_negotiate_features(struct vtnet_softc *); 104 static int vtnet_setup_features(struct vtnet_softc *); 105 static int vtnet_init_rxq(struct vtnet_softc *, int); 106 static int vtnet_init_txq(struct vtnet_softc *, int); 107 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 108 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 109 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 110 static void vtnet_free_rx_filters(struct vtnet_softc *); 111 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 112 static int vtnet_alloc_interface(struct vtnet_softc *); 113 static int vtnet_setup_interface(struct vtnet_softc *); 114 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 115 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 116 static int vtnet_ioctl_multi(struct vtnet_softc *); 117 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 118 static int vtnet_ioctl(if_t, u_long, caddr_t); 119 static uint64_t vtnet_get_counter(if_t, ift_counter); 120 121 static int vtnet_rxq_populate(struct vtnet_rxq *); 122 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 123 static struct mbuf * 124 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 125 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 126 struct mbuf *, int); 127 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 128 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 129 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 130 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 131 uint16_t, int, struct virtio_net_hdr *); 132 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 133 uint16_t, int, struct virtio_net_hdr *); 134 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 135 struct virtio_net_hdr *); 136 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 137 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 138 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 139 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 140 struct virtio_net_hdr *); 141 static int vtnet_rxq_eof(struct vtnet_rxq *); 142 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 143 static void vtnet_rx_vq_intr(void *); 144 static void vtnet_rxq_tq_intr(void *, int); 145 146 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 147 static int vtnet_txq_below_threshold(struct vtnet_txq *); 148 static int vtnet_txq_notify(struct vtnet_txq *); 149 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 150 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 151 int *, int *, int *); 152 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 153 int, struct virtio_net_hdr *); 154 static struct mbuf * 155 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 156 struct virtio_net_hdr *); 157 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 158 struct vtnet_tx_header *); 159 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 160 #ifdef VTNET_LEGACY_TX 161 static void vtnet_start_locked(struct vtnet_txq *, if_t); 162 static void vtnet_start(if_t); 163 #else 164 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 165 static int vtnet_txq_mq_start(if_t, struct mbuf *); 166 static void vtnet_txq_tq_deferred(void *, int); 167 #endif 168 static void vtnet_txq_start(struct vtnet_txq *); 169 static void vtnet_txq_tq_intr(void *, int); 170 static int vtnet_txq_eof(struct vtnet_txq *); 171 static void vtnet_tx_vq_intr(void *); 172 static void vtnet_tx_start_all(struct vtnet_softc *); 173 174 #ifndef VTNET_LEGACY_TX 175 static void vtnet_qflush(if_t); 176 #endif 177 178 static int vtnet_watchdog(struct vtnet_txq *); 179 static void vtnet_accum_stats(struct vtnet_softc *, 180 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 181 static void vtnet_tick(void *); 182 183 static void vtnet_start_taskqueues(struct vtnet_softc *); 184 static void vtnet_free_taskqueues(struct vtnet_softc *); 185 static void vtnet_drain_taskqueues(struct vtnet_softc *); 186 187 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 188 static void vtnet_stop_rendezvous(struct vtnet_softc *); 189 static void vtnet_stop(struct vtnet_softc *); 190 static int vtnet_virtio_reinit(struct vtnet_softc *); 191 static void vtnet_init_rx_filters(struct vtnet_softc *); 192 static int vtnet_init_rx_queues(struct vtnet_softc *); 193 static int vtnet_init_tx_queues(struct vtnet_softc *); 194 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 195 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 196 static void vtnet_update_rx_offloads(struct vtnet_softc *); 197 static int vtnet_reinit(struct vtnet_softc *); 198 static void vtnet_init_locked(struct vtnet_softc *, int); 199 static void vtnet_init(void *); 200 201 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 202 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 203 struct sglist *, int, int); 204 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 205 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 206 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 207 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 208 static int vtnet_set_promisc(struct vtnet_softc *, bool); 209 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 210 static void vtnet_rx_filter(struct vtnet_softc *); 211 static void vtnet_rx_filter_mac(struct vtnet_softc *); 212 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 213 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 214 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 215 static void vtnet_register_vlan(void *, if_t, uint16_t); 216 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 217 218 static void vtnet_update_speed_duplex(struct vtnet_softc *); 219 static int vtnet_is_link_up(struct vtnet_softc *); 220 static void vtnet_update_link_status(struct vtnet_softc *); 221 static int vtnet_ifmedia_upd(if_t); 222 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 223 static void vtnet_get_macaddr(struct vtnet_softc *); 224 static void vtnet_set_macaddr(struct vtnet_softc *); 225 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 226 static void vtnet_vlan_tag_remove(struct mbuf *); 227 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 228 229 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 230 struct sysctl_oid_list *, struct vtnet_rxq *); 231 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 232 struct sysctl_oid_list *, struct vtnet_txq *); 233 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 234 static void vtnet_load_tunables(struct vtnet_softc *); 235 static void vtnet_setup_sysctl(struct vtnet_softc *); 236 237 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 238 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 239 static int vtnet_txq_enable_intr(struct vtnet_txq *); 240 static void vtnet_txq_disable_intr(struct vtnet_txq *); 241 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 242 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 243 static void vtnet_enable_interrupts(struct vtnet_softc *); 244 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 245 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 246 static void vtnet_disable_interrupts(struct vtnet_softc *); 247 248 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 249 250 DEBUGNET_DEFINE(vtnet); 251 252 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 253 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 254 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 255 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 256 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 257 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 258 259 /* Tunables. */ 260 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 261 "VirtIO Net driver parameters"); 262 263 static int vtnet_csum_disable = 0; 264 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 265 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 266 267 static int vtnet_fixup_needs_csum = 0; 268 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 269 &vtnet_fixup_needs_csum, 0, 270 "Calculate valid checksum for NEEDS_CSUM packets"); 271 272 static int vtnet_tso_disable = 0; 273 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 274 &vtnet_tso_disable, 0, "Disables TSO"); 275 276 static int vtnet_lro_disable = 0; 277 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 278 &vtnet_lro_disable, 0, "Disables hardware LRO"); 279 280 static int vtnet_mq_disable = 0; 281 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 282 &vtnet_mq_disable, 0, "Disables multiqueue support"); 283 284 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 285 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 286 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 287 288 static int vtnet_tso_maxlen = IP_MAXPACKET; 289 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 290 &vtnet_tso_maxlen, 0, "TSO burst limit"); 291 292 static int vtnet_rx_process_limit = 1024; 293 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 294 &vtnet_rx_process_limit, 0, 295 "Number of RX segments processed in one pass"); 296 297 static int vtnet_lro_entry_count = 128; 298 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 299 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 300 301 /* Enable sorted LRO, and the depth of the mbuf queue. */ 302 static int vtnet_lro_mbufq_depth = 0; 303 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 304 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 305 306 static uma_zone_t vtnet_tx_header_zone; 307 308 static struct virtio_feature_desc vtnet_feature_desc[] = { 309 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 310 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 311 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 312 { VIRTIO_NET_F_MAC, "MAC" }, 313 { VIRTIO_NET_F_GSO, "TxGSO" }, 314 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 315 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 316 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 317 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 318 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 319 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 320 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 321 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 322 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 323 { VIRTIO_NET_F_STATUS, "Status" }, 324 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 325 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 326 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 327 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 328 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 329 { VIRTIO_NET_F_MQ, "Multiqueue" }, 330 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 331 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 332 333 { 0, NULL } 334 }; 335 336 static device_method_t vtnet_methods[] = { 337 /* Device methods. */ 338 DEVMETHOD(device_probe, vtnet_probe), 339 DEVMETHOD(device_attach, vtnet_attach), 340 DEVMETHOD(device_detach, vtnet_detach), 341 DEVMETHOD(device_suspend, vtnet_suspend), 342 DEVMETHOD(device_resume, vtnet_resume), 343 DEVMETHOD(device_shutdown, vtnet_shutdown), 344 345 /* VirtIO methods. */ 346 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 347 DEVMETHOD(virtio_config_change, vtnet_config_change), 348 349 DEVMETHOD_END 350 }; 351 352 #ifdef DEV_NETMAP 353 #include <dev/netmap/if_vtnet_netmap.h> 354 #endif 355 356 static driver_t vtnet_driver = { 357 .name = "vtnet", 358 .methods = vtnet_methods, 359 .size = sizeof(struct vtnet_softc) 360 }; 361 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 362 MODULE_VERSION(vtnet, 1); 363 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 364 #ifdef DEV_NETMAP 365 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 366 #endif 367 368 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 369 370 static int 371 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 372 { 373 int error = 0; 374 static int loaded = 0; 375 376 switch (type) { 377 case MOD_LOAD: 378 if (loaded++ == 0) { 379 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 380 sizeof(struct vtnet_tx_header), 381 NULL, NULL, NULL, NULL, 0, 0); 382 #ifdef DEBUGNET 383 /* 384 * We need to allocate from this zone in the transmit path, so ensure 385 * that we have at least one item per header available. 386 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 387 * buckets 388 */ 389 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 390 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 391 #endif 392 } 393 break; 394 case MOD_QUIESCE: 395 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 396 error = EBUSY; 397 break; 398 case MOD_UNLOAD: 399 if (--loaded == 0) { 400 uma_zdestroy(vtnet_tx_header_zone); 401 vtnet_tx_header_zone = NULL; 402 } 403 break; 404 case MOD_SHUTDOWN: 405 break; 406 default: 407 error = EOPNOTSUPP; 408 break; 409 } 410 411 return (error); 412 } 413 414 static int 415 vtnet_probe(device_t dev) 416 { 417 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 418 } 419 420 static int 421 vtnet_attach(device_t dev) 422 { 423 struct vtnet_softc *sc; 424 int error; 425 426 sc = device_get_softc(dev); 427 sc->vtnet_dev = dev; 428 virtio_set_feature_desc(dev, vtnet_feature_desc); 429 430 VTNET_CORE_LOCK_INIT(sc); 431 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 432 vtnet_load_tunables(sc); 433 434 error = vtnet_alloc_interface(sc); 435 if (error) { 436 device_printf(dev, "cannot allocate interface\n"); 437 goto fail; 438 } 439 440 vtnet_setup_sysctl(sc); 441 442 error = vtnet_setup_features(sc); 443 if (error) { 444 device_printf(dev, "cannot setup features\n"); 445 goto fail; 446 } 447 448 error = vtnet_alloc_rx_filters(sc); 449 if (error) { 450 device_printf(dev, "cannot allocate Rx filters\n"); 451 goto fail; 452 } 453 454 error = vtnet_alloc_rxtx_queues(sc); 455 if (error) { 456 device_printf(dev, "cannot allocate queues\n"); 457 goto fail; 458 } 459 460 error = vtnet_alloc_virtqueues(sc); 461 if (error) { 462 device_printf(dev, "cannot allocate virtqueues\n"); 463 goto fail; 464 } 465 466 error = vtnet_setup_interface(sc); 467 if (error) { 468 device_printf(dev, "cannot setup interface\n"); 469 goto fail; 470 } 471 472 error = virtio_setup_intr(dev, INTR_TYPE_NET); 473 if (error) { 474 device_printf(dev, "cannot setup interrupts\n"); 475 ether_ifdetach(sc->vtnet_ifp); 476 goto fail; 477 } 478 479 #ifdef DEV_NETMAP 480 vtnet_netmap_attach(sc); 481 #endif 482 vtnet_start_taskqueues(sc); 483 484 fail: 485 if (error) 486 vtnet_detach(dev); 487 488 return (error); 489 } 490 491 static int 492 vtnet_detach(device_t dev) 493 { 494 struct vtnet_softc *sc; 495 if_t ifp; 496 497 sc = device_get_softc(dev); 498 ifp = sc->vtnet_ifp; 499 500 if (device_is_attached(dev)) { 501 VTNET_CORE_LOCK(sc); 502 vtnet_stop(sc); 503 VTNET_CORE_UNLOCK(sc); 504 505 callout_drain(&sc->vtnet_tick_ch); 506 vtnet_drain_taskqueues(sc); 507 508 ether_ifdetach(ifp); 509 } 510 511 #ifdef DEV_NETMAP 512 netmap_detach(ifp); 513 #endif 514 515 if (sc->vtnet_pfil != NULL) { 516 pfil_head_unregister(sc->vtnet_pfil); 517 sc->vtnet_pfil = NULL; 518 } 519 520 vtnet_free_taskqueues(sc); 521 522 if (sc->vtnet_vlan_attach != NULL) { 523 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 524 sc->vtnet_vlan_attach = NULL; 525 } 526 if (sc->vtnet_vlan_detach != NULL) { 527 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 528 sc->vtnet_vlan_detach = NULL; 529 } 530 531 ifmedia_removeall(&sc->vtnet_media); 532 533 if (ifp != NULL) { 534 if_free(ifp); 535 sc->vtnet_ifp = NULL; 536 } 537 538 vtnet_free_rxtx_queues(sc); 539 vtnet_free_rx_filters(sc); 540 541 if (sc->vtnet_ctrl_vq != NULL) 542 vtnet_free_ctrl_vq(sc); 543 544 VTNET_CORE_LOCK_DESTROY(sc); 545 546 return (0); 547 } 548 549 static int 550 vtnet_suspend(device_t dev) 551 { 552 struct vtnet_softc *sc; 553 554 sc = device_get_softc(dev); 555 556 VTNET_CORE_LOCK(sc); 557 vtnet_stop(sc); 558 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 559 VTNET_CORE_UNLOCK(sc); 560 561 return (0); 562 } 563 564 static int 565 vtnet_resume(device_t dev) 566 { 567 struct vtnet_softc *sc; 568 if_t ifp; 569 570 sc = device_get_softc(dev); 571 ifp = sc->vtnet_ifp; 572 573 VTNET_CORE_LOCK(sc); 574 if (if_getflags(ifp) & IFF_UP) 575 vtnet_init_locked(sc, 0); 576 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 577 VTNET_CORE_UNLOCK(sc); 578 579 return (0); 580 } 581 582 static int 583 vtnet_shutdown(device_t dev) 584 { 585 /* 586 * Suspend already does all of what we need to 587 * do here; we just never expect to be resumed. 588 */ 589 return (vtnet_suspend(dev)); 590 } 591 592 static int 593 vtnet_attach_completed(device_t dev) 594 { 595 struct vtnet_softc *sc; 596 597 sc = device_get_softc(dev); 598 599 VTNET_CORE_LOCK(sc); 600 vtnet_attached_set_macaddr(sc); 601 VTNET_CORE_UNLOCK(sc); 602 603 return (0); 604 } 605 606 static int 607 vtnet_config_change(device_t dev) 608 { 609 struct vtnet_softc *sc; 610 611 sc = device_get_softc(dev); 612 613 VTNET_CORE_LOCK(sc); 614 vtnet_update_link_status(sc); 615 if (sc->vtnet_link_active != 0) 616 vtnet_tx_start_all(sc); 617 VTNET_CORE_UNLOCK(sc); 618 619 return (0); 620 } 621 622 static int 623 vtnet_negotiate_features(struct vtnet_softc *sc) 624 { 625 device_t dev; 626 uint64_t features, negotiated_features; 627 int no_csum; 628 629 dev = sc->vtnet_dev; 630 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 631 VTNET_LEGACY_FEATURES; 632 633 /* 634 * TSO and LRO are only available when their corresponding checksum 635 * offload feature is also negotiated. 636 */ 637 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 638 if (no_csum) 639 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 640 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 641 features &= ~VTNET_TSO_FEATURES; 642 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 643 features &= ~VTNET_LRO_FEATURES; 644 645 #ifndef VTNET_LEGACY_TX 646 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 647 features &= ~VIRTIO_NET_F_MQ; 648 #else 649 features &= ~VIRTIO_NET_F_MQ; 650 #endif 651 652 negotiated_features = virtio_negotiate_features(dev, features); 653 654 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 655 uint16_t mtu; 656 657 mtu = virtio_read_dev_config_2(dev, 658 offsetof(struct virtio_net_config, mtu)); 659 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 660 device_printf(dev, "Invalid MTU value: %d. " 661 "MTU feature disabled.\n", mtu); 662 features &= ~VIRTIO_NET_F_MTU; 663 negotiated_features = 664 virtio_negotiate_features(dev, features); 665 } 666 } 667 668 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 669 uint16_t npairs; 670 671 npairs = virtio_read_dev_config_2(dev, 672 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 673 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 674 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 675 device_printf(dev, "Invalid max_virtqueue_pairs value: " 676 "%d. Multiqueue feature disabled.\n", npairs); 677 features &= ~VIRTIO_NET_F_MQ; 678 negotiated_features = 679 virtio_negotiate_features(dev, features); 680 } 681 } 682 683 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 684 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 685 /* 686 * LRO without mergeable buffers requires special care. This 687 * is not ideal because every receive buffer must be large 688 * enough to hold the maximum TCP packet, the Ethernet header, 689 * and the header. This requires up to 34 descriptors with 690 * MCLBYTES clusters. If we do not have indirect descriptors, 691 * LRO is disabled since the virtqueue will not contain very 692 * many receive buffers. 693 */ 694 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 695 device_printf(dev, 696 "Host LRO disabled since both mergeable buffers " 697 "and indirect descriptors were not negotiated\n"); 698 features &= ~VTNET_LRO_FEATURES; 699 negotiated_features = 700 virtio_negotiate_features(dev, features); 701 } else 702 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 703 } 704 705 sc->vtnet_features = negotiated_features; 706 sc->vtnet_negotiated_features = negotiated_features; 707 708 return (virtio_finalize_features(dev)); 709 } 710 711 static int 712 vtnet_setup_features(struct vtnet_softc *sc) 713 { 714 device_t dev; 715 int error; 716 717 dev = sc->vtnet_dev; 718 719 error = vtnet_negotiate_features(sc); 720 if (error) 721 return (error); 722 723 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 724 sc->vtnet_flags |= VTNET_FLAG_MODERN; 725 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 726 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 727 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 728 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 729 730 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 731 /* This feature should always be negotiated. */ 732 sc->vtnet_flags |= VTNET_FLAG_MAC; 733 } 734 735 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 736 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 737 offsetof(struct virtio_net_config, mtu)); 738 } else 739 sc->vtnet_max_mtu = VTNET_MAX_MTU; 740 741 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 742 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 743 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 744 } else if (vtnet_modern(sc)) { 745 /* This is identical to the mergeable header. */ 746 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 747 } else 748 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 749 750 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 751 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 752 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 753 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 754 else 755 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 756 757 /* 758 * Favor "hardware" LRO if negotiated, but support software LRO as 759 * a fallback; there is usually little benefit (or worse) with both. 760 */ 761 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 762 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 763 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 764 765 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 766 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 767 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 768 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 769 else 770 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 771 772 sc->vtnet_req_vq_pairs = 1; 773 sc->vtnet_max_vq_pairs = 1; 774 775 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 776 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 777 778 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 779 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 780 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 781 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 782 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 783 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 784 785 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 786 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 787 offsetof(struct virtio_net_config, 788 max_virtqueue_pairs)); 789 } 790 } 791 792 if (sc->vtnet_max_vq_pairs > 1) { 793 int req; 794 795 /* 796 * Limit the maximum number of requested queue pairs to the 797 * number of CPUs and the configured maximum. 798 */ 799 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 800 if (req < 0) 801 req = 1; 802 if (req == 0) 803 req = mp_ncpus; 804 if (req > sc->vtnet_max_vq_pairs) 805 req = sc->vtnet_max_vq_pairs; 806 if (req > mp_ncpus) 807 req = mp_ncpus; 808 if (req > 1) { 809 sc->vtnet_req_vq_pairs = req; 810 sc->vtnet_flags |= VTNET_FLAG_MQ; 811 } 812 } 813 814 return (0); 815 } 816 817 static int 818 vtnet_init_rxq(struct vtnet_softc *sc, int id) 819 { 820 struct vtnet_rxq *rxq; 821 822 rxq = &sc->vtnet_rxqs[id]; 823 824 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 825 device_get_nameunit(sc->vtnet_dev), id); 826 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 827 828 rxq->vtnrx_sc = sc; 829 rxq->vtnrx_id = id; 830 831 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 832 if (rxq->vtnrx_sg == NULL) 833 return (ENOMEM); 834 835 #if defined(INET) || defined(INET6) 836 if (vtnet_software_lro(sc)) { 837 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 838 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 839 return (ENOMEM); 840 } 841 #endif 842 843 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 844 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 845 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 846 847 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 848 } 849 850 static int 851 vtnet_init_txq(struct vtnet_softc *sc, int id) 852 { 853 struct vtnet_txq *txq; 854 855 txq = &sc->vtnet_txqs[id]; 856 857 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 858 device_get_nameunit(sc->vtnet_dev), id); 859 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 860 861 txq->vtntx_sc = sc; 862 txq->vtntx_id = id; 863 864 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 865 if (txq->vtntx_sg == NULL) 866 return (ENOMEM); 867 868 #ifndef VTNET_LEGACY_TX 869 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 870 M_NOWAIT, &txq->vtntx_mtx); 871 if (txq->vtntx_br == NULL) 872 return (ENOMEM); 873 874 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 875 #endif 876 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 877 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 878 taskqueue_thread_enqueue, &txq->vtntx_tq); 879 if (txq->vtntx_tq == NULL) 880 return (ENOMEM); 881 882 return (0); 883 } 884 885 static int 886 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 887 { 888 int i, npairs, error; 889 890 npairs = sc->vtnet_max_vq_pairs; 891 892 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 893 M_NOWAIT | M_ZERO); 894 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 895 M_NOWAIT | M_ZERO); 896 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 897 return (ENOMEM); 898 899 for (i = 0; i < npairs; i++) { 900 error = vtnet_init_rxq(sc, i); 901 if (error) 902 return (error); 903 error = vtnet_init_txq(sc, i); 904 if (error) 905 return (error); 906 } 907 908 vtnet_set_rx_process_limit(sc); 909 vtnet_setup_queue_sysctl(sc); 910 911 return (0); 912 } 913 914 static void 915 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 916 { 917 918 rxq->vtnrx_sc = NULL; 919 rxq->vtnrx_id = -1; 920 921 #if defined(INET) || defined(INET6) 922 tcp_lro_free(&rxq->vtnrx_lro); 923 #endif 924 925 if (rxq->vtnrx_sg != NULL) { 926 sglist_free(rxq->vtnrx_sg); 927 rxq->vtnrx_sg = NULL; 928 } 929 930 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 931 mtx_destroy(&rxq->vtnrx_mtx); 932 } 933 934 static void 935 vtnet_destroy_txq(struct vtnet_txq *txq) 936 { 937 938 txq->vtntx_sc = NULL; 939 txq->vtntx_id = -1; 940 941 if (txq->vtntx_sg != NULL) { 942 sglist_free(txq->vtntx_sg); 943 txq->vtntx_sg = NULL; 944 } 945 946 #ifndef VTNET_LEGACY_TX 947 if (txq->vtntx_br != NULL) { 948 buf_ring_free(txq->vtntx_br, M_DEVBUF); 949 txq->vtntx_br = NULL; 950 } 951 #endif 952 953 if (mtx_initialized(&txq->vtntx_mtx) != 0) 954 mtx_destroy(&txq->vtntx_mtx); 955 } 956 957 static void 958 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 959 { 960 int i; 961 962 if (sc->vtnet_rxqs != NULL) { 963 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 964 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 965 free(sc->vtnet_rxqs, M_DEVBUF); 966 sc->vtnet_rxqs = NULL; 967 } 968 969 if (sc->vtnet_txqs != NULL) { 970 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 971 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 972 free(sc->vtnet_txqs, M_DEVBUF); 973 sc->vtnet_txqs = NULL; 974 } 975 } 976 977 static int 978 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 979 { 980 981 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 982 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 983 M_DEVBUF, M_NOWAIT | M_ZERO); 984 if (sc->vtnet_mac_filter == NULL) 985 return (ENOMEM); 986 } 987 988 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 989 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 990 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 991 if (sc->vtnet_vlan_filter == NULL) 992 return (ENOMEM); 993 } 994 995 return (0); 996 } 997 998 static void 999 vtnet_free_rx_filters(struct vtnet_softc *sc) 1000 { 1001 1002 if (sc->vtnet_mac_filter != NULL) { 1003 free(sc->vtnet_mac_filter, M_DEVBUF); 1004 sc->vtnet_mac_filter = NULL; 1005 } 1006 1007 if (sc->vtnet_vlan_filter != NULL) { 1008 free(sc->vtnet_vlan_filter, M_DEVBUF); 1009 sc->vtnet_vlan_filter = NULL; 1010 } 1011 } 1012 1013 static int 1014 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1015 { 1016 device_t dev; 1017 struct vq_alloc_info *info; 1018 struct vtnet_rxq *rxq; 1019 struct vtnet_txq *txq; 1020 int i, idx, nvqs, error; 1021 1022 dev = sc->vtnet_dev; 1023 1024 nvqs = sc->vtnet_max_vq_pairs * 2; 1025 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1026 nvqs++; 1027 1028 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1029 if (info == NULL) 1030 return (ENOMEM); 1031 1032 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1033 rxq = &sc->vtnet_rxqs[i]; 1034 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1035 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1036 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1037 1038 txq = &sc->vtnet_txqs[i]; 1039 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1040 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1041 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1042 } 1043 1044 /* These queues will not be used so allocate the minimum resources. */ 1045 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1046 rxq = &sc->vtnet_rxqs[i]; 1047 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1048 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1049 1050 txq = &sc->vtnet_txqs[i]; 1051 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1052 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1053 } 1054 1055 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1056 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1057 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1058 } 1059 1060 error = virtio_alloc_virtqueues(dev, nvqs, info); 1061 free(info, M_TEMP); 1062 1063 return (error); 1064 } 1065 1066 static int 1067 vtnet_alloc_interface(struct vtnet_softc *sc) 1068 { 1069 device_t dev; 1070 if_t ifp; 1071 1072 dev = sc->vtnet_dev; 1073 1074 ifp = if_alloc(IFT_ETHER); 1075 if (ifp == NULL) 1076 return (ENOMEM); 1077 1078 sc->vtnet_ifp = ifp; 1079 if_setsoftc(ifp, sc); 1080 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1081 1082 return (0); 1083 } 1084 1085 static int 1086 vtnet_setup_interface(struct vtnet_softc *sc) 1087 { 1088 device_t dev; 1089 struct pfil_head_args pa; 1090 if_t ifp; 1091 1092 dev = sc->vtnet_dev; 1093 ifp = sc->vtnet_ifp; 1094 1095 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1096 if_setbaudrate(ifp, IF_Gbps(10)); 1097 if_setinitfn(ifp, vtnet_init); 1098 if_setioctlfn(ifp, vtnet_ioctl); 1099 if_setgetcounterfn(ifp, vtnet_get_counter); 1100 #ifndef VTNET_LEGACY_TX 1101 if_settransmitfn(ifp, vtnet_txq_mq_start); 1102 if_setqflushfn(ifp, vtnet_qflush); 1103 #else 1104 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1105 if_setstartfn(ifp, vtnet_start); 1106 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1107 if_setsendqready(ifp); 1108 #endif 1109 1110 vtnet_get_macaddr(sc); 1111 1112 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1113 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1114 1115 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1116 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1117 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1118 1119 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1120 int gso; 1121 1122 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1123 1124 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1125 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1126 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1127 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1128 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1129 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1130 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1131 1132 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1133 int tso_maxlen; 1134 1135 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1136 1137 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1138 vtnet_tso_maxlen); 1139 if_sethwtsomax(ifp, tso_maxlen - 1140 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1141 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1142 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1143 } 1144 } 1145 1146 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1147 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1148 #ifdef notyet 1149 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1150 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1151 #endif 1152 1153 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1154 vtnet_fixup_needs_csum) != 0) 1155 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1156 1157 /* Support either "hardware" or software LRO. */ 1158 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1159 } 1160 1161 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1162 /* 1163 * VirtIO does not support VLAN tagging, but we can fake 1164 * it by inserting and removing the 802.1Q header during 1165 * transmit and receive. We are then able to do checksum 1166 * offloading of VLAN frames. 1167 */ 1168 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1169 } 1170 1171 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1172 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1173 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1174 1175 /* 1176 * Capabilities after here are not enabled by default. 1177 */ 1178 if_setcapenable(ifp, if_getcapabilities(ifp)); 1179 1180 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1181 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1182 1183 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1184 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1185 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1186 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1187 } 1188 1189 ether_ifattach(ifp, sc->vtnet_hwaddr); 1190 1191 /* Tell the upper layer(s) we support long frames. */ 1192 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1193 1194 DEBUGNET_SET(ifp, vtnet); 1195 1196 pa.pa_version = PFIL_VERSION; 1197 pa.pa_flags = PFIL_IN; 1198 pa.pa_type = PFIL_TYPE_ETHERNET; 1199 pa.pa_headname = if_name(ifp); 1200 sc->vtnet_pfil = pfil_head_register(&pa); 1201 1202 return (0); 1203 } 1204 1205 static int 1206 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1207 { 1208 int framesz; 1209 1210 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1211 return (MJUMPAGESIZE); 1212 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1213 return (MCLBYTES); 1214 1215 /* 1216 * Try to scale the receive mbuf cluster size from the MTU. We 1217 * could also use the VQ size to influence the selected size, 1218 * but that would only matter for very small queues. 1219 */ 1220 if (vtnet_modern(sc)) { 1221 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1222 framesz = sizeof(struct virtio_net_hdr_v1); 1223 } else 1224 framesz = sizeof(struct vtnet_rx_header); 1225 framesz += sizeof(struct ether_vlan_header) + mtu; 1226 1227 if (framesz <= MCLBYTES) 1228 return (MCLBYTES); 1229 else if (framesz <= MJUMPAGESIZE) 1230 return (MJUMPAGESIZE); 1231 else if (framesz <= MJUM9BYTES) 1232 return (MJUM9BYTES); 1233 1234 /* Sane default; avoid 16KB clusters. */ 1235 return (MCLBYTES); 1236 } 1237 1238 static int 1239 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1240 { 1241 if_t ifp; 1242 int clustersz; 1243 1244 ifp = sc->vtnet_ifp; 1245 VTNET_CORE_LOCK_ASSERT(sc); 1246 1247 if (if_getmtu(ifp) == mtu) 1248 return (0); 1249 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1250 return (EINVAL); 1251 1252 if_setmtu(ifp, mtu); 1253 clustersz = vtnet_rx_cluster_size(sc, mtu); 1254 1255 if (clustersz != sc->vtnet_rx_clustersz && 1256 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1257 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1258 vtnet_init_locked(sc, 0); 1259 } 1260 1261 return (0); 1262 } 1263 1264 static int 1265 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1266 { 1267 if_t ifp; 1268 int drv_running; 1269 1270 ifp = sc->vtnet_ifp; 1271 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1272 1273 VTNET_CORE_LOCK_ASSERT(sc); 1274 1275 if ((if_getflags(ifp) & IFF_UP) == 0) { 1276 if (drv_running) 1277 vtnet_stop(sc); 1278 goto out; 1279 } 1280 1281 if (!drv_running) { 1282 vtnet_init_locked(sc, 0); 1283 goto out; 1284 } 1285 1286 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1287 (IFF_PROMISC | IFF_ALLMULTI)) { 1288 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1289 vtnet_rx_filter(sc); 1290 else { 1291 /* 1292 * We don't support filtering out multicast, so 1293 * ALLMULTI is always set. 1294 */ 1295 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1296 if_setflagbits(ifp, IFF_PROMISC, 0); 1297 } 1298 } 1299 1300 out: 1301 sc->vtnet_if_flags = if_getflags(ifp); 1302 return (0); 1303 } 1304 1305 static int 1306 vtnet_ioctl_multi(struct vtnet_softc *sc) 1307 { 1308 if_t ifp; 1309 1310 ifp = sc->vtnet_ifp; 1311 1312 VTNET_CORE_LOCK_ASSERT(sc); 1313 1314 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1315 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1316 vtnet_rx_filter_mac(sc); 1317 1318 return (0); 1319 } 1320 1321 static int 1322 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1323 { 1324 if_t ifp; 1325 int mask, reinit, update; 1326 1327 ifp = sc->vtnet_ifp; 1328 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1329 reinit = update = 0; 1330 1331 VTNET_CORE_LOCK_ASSERT(sc); 1332 1333 if (mask & IFCAP_TXCSUM) 1334 if_togglecapenable(ifp, IFCAP_TXCSUM); 1335 if (mask & IFCAP_TXCSUM_IPV6) 1336 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1337 if (mask & IFCAP_TSO4) 1338 if_togglecapenable(ifp, IFCAP_TSO4); 1339 if (mask & IFCAP_TSO6) 1340 if_togglecapenable(ifp, IFCAP_TSO6); 1341 1342 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1343 /* 1344 * These Rx features require the negotiated features to 1345 * be updated. Avoid a full reinit if possible. 1346 */ 1347 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1348 update = 1; 1349 else 1350 reinit = 1; 1351 1352 /* BMV: Avoid needless renegotiation for just software LRO. */ 1353 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1354 IFCAP_LRO && vtnet_software_lro(sc)) 1355 reinit = update = 0; 1356 1357 if (mask & IFCAP_RXCSUM) 1358 if_togglecapenable(ifp, IFCAP_RXCSUM); 1359 if (mask & IFCAP_RXCSUM_IPV6) 1360 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1361 if (mask & IFCAP_LRO) 1362 if_togglecapenable(ifp, IFCAP_LRO); 1363 1364 /* 1365 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1366 * so treat them as a pair. Guest TSO (LRO) requires receive 1367 * checksums. 1368 */ 1369 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1370 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1371 #ifdef notyet 1372 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1373 #endif 1374 } else 1375 if_setcapenablebit(ifp, 0, 1376 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1377 } 1378 1379 if (mask & IFCAP_VLAN_HWFILTER) { 1380 /* These Rx features require renegotiation. */ 1381 reinit = 1; 1382 1383 if (mask & IFCAP_VLAN_HWFILTER) 1384 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1385 } 1386 1387 if (mask & IFCAP_VLAN_HWTSO) 1388 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1389 if (mask & IFCAP_VLAN_HWTAGGING) 1390 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1391 1392 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1393 if (reinit) { 1394 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1395 vtnet_init_locked(sc, 0); 1396 } else if (update) 1397 vtnet_update_rx_offloads(sc); 1398 } 1399 1400 return (0); 1401 } 1402 1403 static int 1404 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1405 { 1406 struct vtnet_softc *sc; 1407 struct ifreq *ifr; 1408 int error; 1409 1410 sc = if_getsoftc(ifp); 1411 ifr = (struct ifreq *) data; 1412 error = 0; 1413 1414 switch (cmd) { 1415 case SIOCSIFMTU: 1416 VTNET_CORE_LOCK(sc); 1417 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1418 VTNET_CORE_UNLOCK(sc); 1419 break; 1420 1421 case SIOCSIFFLAGS: 1422 VTNET_CORE_LOCK(sc); 1423 error = vtnet_ioctl_ifflags(sc); 1424 VTNET_CORE_UNLOCK(sc); 1425 break; 1426 1427 case SIOCADDMULTI: 1428 case SIOCDELMULTI: 1429 VTNET_CORE_LOCK(sc); 1430 error = vtnet_ioctl_multi(sc); 1431 VTNET_CORE_UNLOCK(sc); 1432 break; 1433 1434 case SIOCSIFMEDIA: 1435 case SIOCGIFMEDIA: 1436 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1437 break; 1438 1439 case SIOCSIFCAP: 1440 VTNET_CORE_LOCK(sc); 1441 error = vtnet_ioctl_ifcap(sc, ifr); 1442 VTNET_CORE_UNLOCK(sc); 1443 VLAN_CAPABILITIES(ifp); 1444 break; 1445 1446 default: 1447 error = ether_ioctl(ifp, cmd, data); 1448 break; 1449 } 1450 1451 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1452 1453 return (error); 1454 } 1455 1456 static int 1457 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1458 { 1459 struct virtqueue *vq; 1460 int nbufs, error; 1461 1462 #ifdef DEV_NETMAP 1463 error = vtnet_netmap_rxq_populate(rxq); 1464 if (error >= 0) 1465 return (error); 1466 #endif /* DEV_NETMAP */ 1467 1468 vq = rxq->vtnrx_vq; 1469 error = ENOSPC; 1470 1471 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1472 error = vtnet_rxq_new_buf(rxq); 1473 if (error) 1474 break; 1475 } 1476 1477 if (nbufs > 0) { 1478 virtqueue_notify(vq); 1479 /* 1480 * EMSGSIZE signifies the virtqueue did not have enough 1481 * entries available to hold the last mbuf. This is not 1482 * an error. 1483 */ 1484 if (error == EMSGSIZE) 1485 error = 0; 1486 } 1487 1488 return (error); 1489 } 1490 1491 static void 1492 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1493 { 1494 struct virtqueue *vq; 1495 struct mbuf *m; 1496 int last; 1497 #ifdef DEV_NETMAP 1498 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1499 rxq->vtnrx_id, NR_RX); 1500 #else /* !DEV_NETMAP */ 1501 void *kring = NULL; 1502 #endif /* !DEV_NETMAP */ 1503 1504 vq = rxq->vtnrx_vq; 1505 last = 0; 1506 1507 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1508 if (kring == NULL) 1509 m_freem(m); 1510 } 1511 1512 KASSERT(virtqueue_empty(vq), 1513 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1514 } 1515 1516 static struct mbuf * 1517 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1518 { 1519 struct mbuf *m_head, *m_tail, *m; 1520 int i, size; 1521 1522 m_head = NULL; 1523 size = sc->vtnet_rx_clustersz; 1524 1525 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1526 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1527 1528 for (i = 0; i < nbufs; i++) { 1529 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1530 if (m == NULL) { 1531 sc->vtnet_stats.mbuf_alloc_failed++; 1532 m_freem(m_head); 1533 return (NULL); 1534 } 1535 1536 m->m_len = size; 1537 if (m_head != NULL) { 1538 m_tail->m_next = m; 1539 m_tail = m; 1540 } else 1541 m_head = m_tail = m; 1542 } 1543 1544 if (m_tailp != NULL) 1545 *m_tailp = m_tail; 1546 1547 return (m_head); 1548 } 1549 1550 /* 1551 * Slow path for when LRO without mergeable buffers is negotiated. 1552 */ 1553 static int 1554 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1555 int len0) 1556 { 1557 struct vtnet_softc *sc; 1558 struct mbuf *m, *m_prev, *m_new, *m_tail; 1559 int len, clustersz, nreplace, error; 1560 1561 sc = rxq->vtnrx_sc; 1562 clustersz = sc->vtnet_rx_clustersz; 1563 1564 m_prev = NULL; 1565 m_tail = NULL; 1566 nreplace = 0; 1567 1568 m = m0; 1569 len = len0; 1570 1571 /* 1572 * Since these mbuf chains are so large, avoid allocating a complete 1573 * replacement when the received frame did not consume the entire 1574 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1575 */ 1576 while (len > 0) { 1577 if (m == NULL) { 1578 sc->vtnet_stats.rx_frame_too_large++; 1579 return (EMSGSIZE); 1580 } 1581 1582 /* 1583 * Every mbuf should have the expected cluster size since that 1584 * is also used to allocate the replacements. 1585 */ 1586 KASSERT(m->m_len == clustersz, 1587 ("%s: mbuf size %d not expected cluster size %d", __func__, 1588 m->m_len, clustersz)); 1589 1590 m->m_len = MIN(m->m_len, len); 1591 len -= m->m_len; 1592 1593 m_prev = m; 1594 m = m->m_next; 1595 nreplace++; 1596 } 1597 1598 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1599 ("%s: invalid replacement mbuf count %d max %d", __func__, 1600 nreplace, sc->vtnet_rx_nmbufs)); 1601 1602 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1603 if (m_new == NULL) { 1604 m_prev->m_len = clustersz; 1605 return (ENOBUFS); 1606 } 1607 1608 /* 1609 * Move any unused mbufs from the received mbuf chain onto the 1610 * end of the replacement chain. 1611 */ 1612 if (m_prev->m_next != NULL) { 1613 m_tail->m_next = m_prev->m_next; 1614 m_prev->m_next = NULL; 1615 } 1616 1617 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1618 if (error) { 1619 /* 1620 * The replacement is suppose to be an copy of the one 1621 * dequeued so this is a very unexpected error. 1622 * 1623 * Restore the m0 chain to the original state if it was 1624 * modified so we can then discard it. 1625 */ 1626 if (m_tail->m_next != NULL) { 1627 m_prev->m_next = m_tail->m_next; 1628 m_tail->m_next = NULL; 1629 } 1630 m_prev->m_len = clustersz; 1631 sc->vtnet_stats.rx_enq_replacement_failed++; 1632 m_freem(m_new); 1633 } 1634 1635 return (error); 1636 } 1637 1638 static int 1639 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1640 { 1641 struct vtnet_softc *sc; 1642 struct mbuf *m_new; 1643 int error; 1644 1645 sc = rxq->vtnrx_sc; 1646 1647 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1648 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1649 1650 MPASS(m->m_next == NULL); 1651 if (m->m_len < len) 1652 return (EMSGSIZE); 1653 1654 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1655 if (m_new == NULL) 1656 return (ENOBUFS); 1657 1658 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1659 if (error) { 1660 sc->vtnet_stats.rx_enq_replacement_failed++; 1661 m_freem(m_new); 1662 } else 1663 m->m_len = len; 1664 1665 return (error); 1666 } 1667 1668 static int 1669 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1670 { 1671 struct vtnet_softc *sc; 1672 struct sglist *sg; 1673 int header_inlined, error; 1674 1675 sc = rxq->vtnrx_sc; 1676 sg = rxq->vtnrx_sg; 1677 1678 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1679 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1680 VTNET_RXQ_LOCK_ASSERT(rxq); 1681 1682 sglist_reset(sg); 1683 header_inlined = vtnet_modern(sc) || 1684 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1685 1686 if (header_inlined) 1687 error = sglist_append_mbuf(sg, m); 1688 else { 1689 struct vtnet_rx_header *rxhdr = 1690 mtod(m, struct vtnet_rx_header *); 1691 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1692 1693 /* Append the header and remaining mbuf data. */ 1694 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1695 if (error) 1696 return (error); 1697 error = sglist_append(sg, &rxhdr[1], 1698 m->m_len - sizeof(struct vtnet_rx_header)); 1699 if (error) 1700 return (error); 1701 1702 if (m->m_next != NULL) 1703 error = sglist_append_mbuf(sg, m->m_next); 1704 } 1705 1706 if (error) 1707 return (error); 1708 1709 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1710 } 1711 1712 static int 1713 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1714 { 1715 struct vtnet_softc *sc; 1716 struct mbuf *m; 1717 int error; 1718 1719 sc = rxq->vtnrx_sc; 1720 1721 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1722 if (m == NULL) 1723 return (ENOBUFS); 1724 1725 error = vtnet_rxq_enqueue_buf(rxq, m); 1726 if (error) 1727 m_freem(m); 1728 1729 return (error); 1730 } 1731 1732 static int 1733 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1734 int hoff, struct virtio_net_hdr *hdr) 1735 { 1736 struct vtnet_softc *sc; 1737 int error; 1738 1739 sc = rxq->vtnrx_sc; 1740 1741 /* 1742 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1743 * not have an analogous CSUM flag. The checksum has been validated, 1744 * but is incomplete (TCP/UDP pseudo header). 1745 * 1746 * The packet is likely from another VM on the same host that itself 1747 * performed checksum offloading so Tx/Rx is basically a memcpy and 1748 * the checksum has little value. 1749 * 1750 * Default to receiving the packet as-is for performance reasons, but 1751 * this can cause issues if the packet is to be forwarded because it 1752 * does not contain a valid checksum. This patch may be helpful: 1753 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1754 * compute the checksum if requested. 1755 * 1756 * BMV: Need to add an CSUM_PARTIAL flag? 1757 */ 1758 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1759 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1760 return (error); 1761 } 1762 1763 /* 1764 * Compute the checksum in the driver so the packet will contain a 1765 * valid checksum. The checksum is at csum_offset from csum_start. 1766 */ 1767 switch (etype) { 1768 #if defined(INET) || defined(INET6) 1769 case ETHERTYPE_IP: 1770 case ETHERTYPE_IPV6: { 1771 int csum_off, csum_end; 1772 uint16_t csum; 1773 1774 csum_off = hdr->csum_start + hdr->csum_offset; 1775 csum_end = csum_off + sizeof(uint16_t); 1776 1777 /* Assume checksum will be in the first mbuf. */ 1778 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1779 return (1); 1780 1781 /* 1782 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1783 * checksum and write it at the specified offset. We could 1784 * try to verify the packet: csum_start should probably 1785 * correspond to the start of the TCP/UDP header. 1786 * 1787 * BMV: Need to properly handle UDP with zero checksum. Is 1788 * the IPv4 header checksum implicitly validated? 1789 */ 1790 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1791 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1792 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1793 m->m_pkthdr.csum_data = 0xFFFF; 1794 break; 1795 } 1796 #endif 1797 default: 1798 sc->vtnet_stats.rx_csum_bad_ethtype++; 1799 return (1); 1800 } 1801 1802 return (0); 1803 } 1804 1805 static int 1806 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1807 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1808 { 1809 #if 0 1810 struct vtnet_softc *sc; 1811 #endif 1812 int protocol; 1813 1814 #if 0 1815 sc = rxq->vtnrx_sc; 1816 #endif 1817 1818 switch (etype) { 1819 #if defined(INET) 1820 case ETHERTYPE_IP: 1821 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1822 protocol = IPPROTO_DONE; 1823 else { 1824 struct ip *ip = (struct ip *)(m->m_data + hoff); 1825 protocol = ip->ip_p; 1826 } 1827 break; 1828 #endif 1829 #if defined(INET6) 1830 case ETHERTYPE_IPV6: 1831 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1832 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1833 protocol = IPPROTO_DONE; 1834 break; 1835 #endif 1836 default: 1837 protocol = IPPROTO_DONE; 1838 break; 1839 } 1840 1841 switch (protocol) { 1842 case IPPROTO_TCP: 1843 case IPPROTO_UDP: 1844 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1845 m->m_pkthdr.csum_data = 0xFFFF; 1846 break; 1847 default: 1848 /* 1849 * FreeBSD does not support checksum offloading of this 1850 * protocol. Let the stack re-verify the checksum later 1851 * if the protocol is supported. 1852 */ 1853 #if 0 1854 if_printf(sc->vtnet_ifp, 1855 "%s: checksum offload of unsupported protocol " 1856 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1857 __func__, etype, protocol, hdr->csum_start, 1858 hdr->csum_offset); 1859 #endif 1860 break; 1861 } 1862 1863 return (0); 1864 } 1865 1866 static int 1867 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1868 struct virtio_net_hdr *hdr) 1869 { 1870 const struct ether_header *eh; 1871 int hoff; 1872 uint16_t etype; 1873 1874 eh = mtod(m, const struct ether_header *); 1875 etype = ntohs(eh->ether_type); 1876 if (etype == ETHERTYPE_VLAN) { 1877 /* TODO BMV: Handle QinQ. */ 1878 const struct ether_vlan_header *evh = 1879 mtod(m, const struct ether_vlan_header *); 1880 etype = ntohs(evh->evl_proto); 1881 hoff = sizeof(struct ether_vlan_header); 1882 } else 1883 hoff = sizeof(struct ether_header); 1884 1885 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1886 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1887 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1888 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1889 } 1890 1891 static void 1892 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1893 { 1894 struct mbuf *m; 1895 1896 while (--nbufs > 0) { 1897 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1898 if (m == NULL) 1899 break; 1900 vtnet_rxq_discard_buf(rxq, m); 1901 } 1902 } 1903 1904 static void 1905 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1906 { 1907 int error __diagused; 1908 1909 /* 1910 * Requeue the discarded mbuf. This should always be successful 1911 * since it was just dequeued. 1912 */ 1913 error = vtnet_rxq_enqueue_buf(rxq, m); 1914 KASSERT(error == 0, 1915 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1916 } 1917 1918 static int 1919 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1920 { 1921 struct vtnet_softc *sc; 1922 struct virtqueue *vq; 1923 struct mbuf *m_tail; 1924 1925 sc = rxq->vtnrx_sc; 1926 vq = rxq->vtnrx_vq; 1927 m_tail = m_head; 1928 1929 while (--nbufs > 0) { 1930 struct mbuf *m; 1931 uint32_t len; 1932 1933 m = virtqueue_dequeue(vq, &len); 1934 if (m == NULL) { 1935 rxq->vtnrx_stats.vrxs_ierrors++; 1936 goto fail; 1937 } 1938 1939 if (vtnet_rxq_new_buf(rxq) != 0) { 1940 rxq->vtnrx_stats.vrxs_iqdrops++; 1941 vtnet_rxq_discard_buf(rxq, m); 1942 if (nbufs > 1) 1943 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1944 goto fail; 1945 } 1946 1947 if (m->m_len < len) 1948 len = m->m_len; 1949 1950 m->m_len = len; 1951 m->m_flags &= ~M_PKTHDR; 1952 1953 m_head->m_pkthdr.len += len; 1954 m_tail->m_next = m; 1955 m_tail = m; 1956 } 1957 1958 return (0); 1959 1960 fail: 1961 sc->vtnet_stats.rx_mergeable_failed++; 1962 m_freem(m_head); 1963 1964 return (1); 1965 } 1966 1967 #if defined(INET) || defined(INET6) 1968 static int 1969 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1970 { 1971 struct lro_ctrl *lro; 1972 1973 lro = &rxq->vtnrx_lro; 1974 1975 if (lro->lro_mbuf_max != 0) { 1976 tcp_lro_queue_mbuf(lro, m); 1977 return (0); 1978 } 1979 1980 return (tcp_lro_rx(lro, m, 0)); 1981 } 1982 #endif 1983 1984 static void 1985 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1986 struct virtio_net_hdr *hdr) 1987 { 1988 struct vtnet_softc *sc; 1989 if_t ifp; 1990 1991 sc = rxq->vtnrx_sc; 1992 ifp = sc->vtnet_ifp; 1993 1994 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 1995 struct ether_header *eh = mtod(m, struct ether_header *); 1996 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1997 vtnet_vlan_tag_remove(m); 1998 /* 1999 * With the 802.1Q header removed, update the 2000 * checksum starting location accordingly. 2001 */ 2002 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2003 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2004 } 2005 } 2006 2007 m->m_pkthdr.flowid = rxq->vtnrx_id; 2008 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2009 2010 if (hdr->flags & 2011 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2012 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2013 rxq->vtnrx_stats.vrxs_csum++; 2014 else 2015 rxq->vtnrx_stats.vrxs_csum_failed++; 2016 } 2017 2018 if (hdr->gso_size != 0) { 2019 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2020 case VIRTIO_NET_HDR_GSO_TCPV4: 2021 case VIRTIO_NET_HDR_GSO_TCPV6: 2022 m->m_pkthdr.lro_nsegs = 2023 howmany(m->m_pkthdr.len, hdr->gso_size); 2024 rxq->vtnrx_stats.vrxs_host_lro++; 2025 break; 2026 } 2027 } 2028 2029 rxq->vtnrx_stats.vrxs_ipackets++; 2030 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2031 2032 #if defined(INET) || defined(INET6) 2033 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2034 if (vtnet_lro_rx(rxq, m) == 0) 2035 return; 2036 } 2037 #endif 2038 2039 if_input(ifp, m); 2040 } 2041 2042 static int 2043 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2044 { 2045 struct virtio_net_hdr lhdr, *hdr; 2046 struct vtnet_softc *sc; 2047 if_t ifp; 2048 struct virtqueue *vq; 2049 int deq, count; 2050 2051 sc = rxq->vtnrx_sc; 2052 vq = rxq->vtnrx_vq; 2053 ifp = sc->vtnet_ifp; 2054 deq = 0; 2055 count = sc->vtnet_rx_process_limit; 2056 2057 VTNET_RXQ_LOCK_ASSERT(rxq); 2058 2059 while (count-- > 0) { 2060 struct mbuf *m; 2061 uint32_t len, nbufs, adjsz; 2062 2063 m = virtqueue_dequeue(vq, &len); 2064 if (m == NULL) 2065 break; 2066 deq++; 2067 2068 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2069 rxq->vtnrx_stats.vrxs_ierrors++; 2070 vtnet_rxq_discard_buf(rxq, m); 2071 continue; 2072 } 2073 2074 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2075 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2076 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2077 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2078 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2079 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2080 } else if (vtnet_modern(sc)) { 2081 nbufs = 1; /* num_buffers is always 1 */ 2082 adjsz = sizeof(struct virtio_net_hdr_v1); 2083 } else { 2084 nbufs = 1; 2085 adjsz = sizeof(struct vtnet_rx_header); 2086 /* 2087 * Account for our gap between the header and start of 2088 * data to keep the segments separated. 2089 */ 2090 len += VTNET_RX_HEADER_PAD; 2091 } 2092 2093 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2094 rxq->vtnrx_stats.vrxs_iqdrops++; 2095 vtnet_rxq_discard_buf(rxq, m); 2096 if (nbufs > 1) 2097 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2098 continue; 2099 } 2100 2101 m->m_pkthdr.len = len; 2102 m->m_pkthdr.rcvif = ifp; 2103 m->m_pkthdr.csum_flags = 0; 2104 2105 if (nbufs > 1) { 2106 /* Dequeue the rest of chain. */ 2107 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2108 continue; 2109 } 2110 2111 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2112 2113 /* 2114 * Save an endian swapped version of the header prior to it 2115 * being stripped. The header is always at the start of the 2116 * mbuf data. num_buffers was already saved (and not needed) 2117 * so use the standard header. 2118 */ 2119 hdr = mtod(m, struct virtio_net_hdr *); 2120 lhdr.flags = hdr->flags; 2121 lhdr.gso_type = hdr->gso_type; 2122 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2123 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2124 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2125 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2126 m_adj(m, adjsz); 2127 2128 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2129 pfil_return_t pfil; 2130 2131 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2132 switch (pfil) { 2133 case PFIL_DROPPED: 2134 case PFIL_CONSUMED: 2135 continue; 2136 default: 2137 KASSERT(pfil == PFIL_PASS, 2138 ("Filter returned %d!", pfil)); 2139 } 2140 } 2141 2142 vtnet_rxq_input(rxq, m, &lhdr); 2143 } 2144 2145 if (deq > 0) { 2146 #if defined(INET) || defined(INET6) 2147 if (vtnet_software_lro(sc)) 2148 tcp_lro_flush_all(&rxq->vtnrx_lro); 2149 #endif 2150 virtqueue_notify(vq); 2151 } 2152 2153 return (count > 0 ? 0 : EAGAIN); 2154 } 2155 2156 static void 2157 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2158 { 2159 struct vtnet_softc *sc; 2160 if_t ifp; 2161 u_int more; 2162 #ifdef DEV_NETMAP 2163 int nmirq; 2164 #endif /* DEV_NETMAP */ 2165 2166 sc = rxq->vtnrx_sc; 2167 ifp = sc->vtnet_ifp; 2168 2169 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2170 /* 2171 * Ignore this interrupt. Either this is a spurious interrupt 2172 * or multiqueue without per-VQ MSIX so every queue needs to 2173 * be polled (a brain dead configuration we could try harder 2174 * to avoid). 2175 */ 2176 vtnet_rxq_disable_intr(rxq); 2177 return; 2178 } 2179 2180 VTNET_RXQ_LOCK(rxq); 2181 2182 #ifdef DEV_NETMAP 2183 /* 2184 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2185 * This is not necessary to serialize the access to the RX vq, but 2186 * rather to avoid races that may happen if this interface is 2187 * attached to a VALE switch, which would cause received packets 2188 * to stall in the RX queue (nm_kr_tryget() could find the kring 2189 * busy when called from netmap_bwrap_intr_notify()). 2190 */ 2191 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2192 if (nmirq != NM_IRQ_PASS) { 2193 VTNET_RXQ_UNLOCK(rxq); 2194 if (nmirq == NM_IRQ_RESCHED) { 2195 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2196 } 2197 return; 2198 } 2199 #endif /* DEV_NETMAP */ 2200 2201 again: 2202 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2203 VTNET_RXQ_UNLOCK(rxq); 2204 return; 2205 } 2206 2207 more = vtnet_rxq_eof(rxq); 2208 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2209 if (!more) 2210 vtnet_rxq_disable_intr(rxq); 2211 /* 2212 * This is an occasional condition or race (when !more), 2213 * so retry a few times before scheduling the taskqueue. 2214 */ 2215 if (tries-- > 0) 2216 goto again; 2217 2218 rxq->vtnrx_stats.vrxs_rescheduled++; 2219 VTNET_RXQ_UNLOCK(rxq); 2220 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2221 } else 2222 VTNET_RXQ_UNLOCK(rxq); 2223 } 2224 2225 static void 2226 vtnet_rx_vq_intr(void *xrxq) 2227 { 2228 struct vtnet_rxq *rxq; 2229 2230 rxq = xrxq; 2231 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2232 } 2233 2234 static void 2235 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2236 { 2237 struct vtnet_rxq *rxq; 2238 2239 rxq = xrxq; 2240 vtnet_rx_vq_process(rxq, 0); 2241 } 2242 2243 static int 2244 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2245 { 2246 struct vtnet_softc *sc; 2247 int threshold; 2248 2249 sc = txq->vtntx_sc; 2250 2251 /* 2252 * The Tx interrupt is disabled until the queue free count falls 2253 * below our threshold. Completed frames are drained from the Tx 2254 * virtqueue before transmitting new frames and in the watchdog 2255 * callout, so the frequency of Tx interrupts is greatly reduced, 2256 * at the cost of not freeing mbufs as quickly as they otherwise 2257 * would be. 2258 */ 2259 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2260 2261 /* 2262 * Without indirect descriptors, leave enough room for the most 2263 * segments we handle. 2264 */ 2265 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2266 threshold < sc->vtnet_tx_nsegs) 2267 threshold = sc->vtnet_tx_nsegs; 2268 2269 return (threshold); 2270 } 2271 2272 static int 2273 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2274 { 2275 struct virtqueue *vq; 2276 2277 vq = txq->vtntx_vq; 2278 2279 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2280 } 2281 2282 static int 2283 vtnet_txq_notify(struct vtnet_txq *txq) 2284 { 2285 struct virtqueue *vq; 2286 2287 vq = txq->vtntx_vq; 2288 2289 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2290 virtqueue_notify(vq); 2291 2292 if (vtnet_txq_enable_intr(txq) == 0) 2293 return (0); 2294 2295 /* 2296 * Drain frames that were completed since last checked. If this 2297 * causes the queue to go above the threshold, the caller should 2298 * continue transmitting. 2299 */ 2300 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2301 virtqueue_disable_intr(vq); 2302 return (1); 2303 } 2304 2305 return (0); 2306 } 2307 2308 static void 2309 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2310 { 2311 struct virtqueue *vq; 2312 struct vtnet_tx_header *txhdr; 2313 int last; 2314 #ifdef DEV_NETMAP 2315 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2316 txq->vtntx_id, NR_TX); 2317 #else /* !DEV_NETMAP */ 2318 void *kring = NULL; 2319 #endif /* !DEV_NETMAP */ 2320 2321 vq = txq->vtntx_vq; 2322 last = 0; 2323 2324 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2325 if (kring == NULL) { 2326 m_freem(txhdr->vth_mbuf); 2327 uma_zfree(vtnet_tx_header_zone, txhdr); 2328 } 2329 } 2330 2331 KASSERT(virtqueue_empty(vq), 2332 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2333 } 2334 2335 /* 2336 * BMV: This can go away once we finally have offsets in the mbuf header. 2337 */ 2338 static int 2339 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2340 int *proto, int *start) 2341 { 2342 struct vtnet_softc *sc; 2343 struct ether_vlan_header *evh; 2344 #if defined(INET) || defined(INET6) 2345 int offset; 2346 #endif 2347 2348 sc = txq->vtntx_sc; 2349 2350 evh = mtod(m, struct ether_vlan_header *); 2351 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2352 /* BMV: We should handle nested VLAN tags too. */ 2353 *etype = ntohs(evh->evl_proto); 2354 #if defined(INET) || defined(INET6) 2355 offset = sizeof(struct ether_vlan_header); 2356 #endif 2357 } else { 2358 *etype = ntohs(evh->evl_encap_proto); 2359 #if defined(INET) || defined(INET6) 2360 offset = sizeof(struct ether_header); 2361 #endif 2362 } 2363 2364 switch (*etype) { 2365 #if defined(INET) 2366 case ETHERTYPE_IP: { 2367 struct ip *ip, iphdr; 2368 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2369 m_copydata(m, offset, sizeof(struct ip), 2370 (caddr_t) &iphdr); 2371 ip = &iphdr; 2372 } else 2373 ip = (struct ip *)(m->m_data + offset); 2374 *proto = ip->ip_p; 2375 *start = offset + (ip->ip_hl << 2); 2376 break; 2377 } 2378 #endif 2379 #if defined(INET6) 2380 case ETHERTYPE_IPV6: 2381 *proto = -1; 2382 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2383 /* Assert the network stack sent us a valid packet. */ 2384 KASSERT(*start > offset, 2385 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2386 *start, offset, *proto)); 2387 break; 2388 #endif 2389 default: 2390 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2391 return (EINVAL); 2392 } 2393 2394 return (0); 2395 } 2396 2397 static int 2398 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2399 int offset, struct virtio_net_hdr *hdr) 2400 { 2401 static struct timeval lastecn; 2402 static int curecn; 2403 struct vtnet_softc *sc; 2404 struct tcphdr *tcp, tcphdr; 2405 2406 sc = txq->vtntx_sc; 2407 2408 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2409 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2410 tcp = &tcphdr; 2411 } else 2412 tcp = (struct tcphdr *)(m->m_data + offset); 2413 2414 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2415 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2416 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2417 VIRTIO_NET_HDR_GSO_TCPV6; 2418 2419 if (__predict_false(tcp->th_flags & TH_CWR)) { 2420 /* 2421 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2422 * FreeBSD, ECN support is not on a per-interface basis, 2423 * but globally via the net.inet.tcp.ecn.enable sysctl 2424 * knob. The default is off. 2425 */ 2426 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2427 if (ppsratecheck(&lastecn, &curecn, 1)) 2428 if_printf(sc->vtnet_ifp, 2429 "TSO with ECN not negotiated with host\n"); 2430 return (ENOTSUP); 2431 } 2432 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2433 } 2434 2435 txq->vtntx_stats.vtxs_tso++; 2436 2437 return (0); 2438 } 2439 2440 static struct mbuf * 2441 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2442 struct virtio_net_hdr *hdr) 2443 { 2444 struct vtnet_softc *sc; 2445 int flags, etype, csum_start, proto, error; 2446 2447 sc = txq->vtntx_sc; 2448 flags = m->m_pkthdr.csum_flags; 2449 2450 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2451 if (error) 2452 goto drop; 2453 2454 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2455 /* Sanity check the parsed mbuf matches the offload flags. */ 2456 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2457 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2458 && etype != ETHERTYPE_IPV6))) { 2459 sc->vtnet_stats.tx_csum_proto_mismatch++; 2460 goto drop; 2461 } 2462 2463 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2464 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2465 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2466 txq->vtntx_stats.vtxs_csum++; 2467 } 2468 2469 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2470 /* 2471 * Sanity check the parsed mbuf IP protocol is TCP, and 2472 * VirtIO TSO reqires the checksum offloading above. 2473 */ 2474 if (__predict_false(proto != IPPROTO_TCP)) { 2475 sc->vtnet_stats.tx_tso_not_tcp++; 2476 goto drop; 2477 } else if (__predict_false((hdr->flags & 2478 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2479 sc->vtnet_stats.tx_tso_without_csum++; 2480 goto drop; 2481 } 2482 2483 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2484 if (error) 2485 goto drop; 2486 } 2487 2488 return (m); 2489 2490 drop: 2491 m_freem(m); 2492 return (NULL); 2493 } 2494 2495 static int 2496 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2497 struct vtnet_tx_header *txhdr) 2498 { 2499 struct vtnet_softc *sc; 2500 struct virtqueue *vq; 2501 struct sglist *sg; 2502 struct mbuf *m; 2503 int error; 2504 2505 sc = txq->vtntx_sc; 2506 vq = txq->vtntx_vq; 2507 sg = txq->vtntx_sg; 2508 m = *m_head; 2509 2510 sglist_reset(sg); 2511 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2512 if (error != 0 || sg->sg_nseg != 1) { 2513 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2514 __func__, error, sg->sg_nseg)); 2515 goto fail; 2516 } 2517 2518 error = sglist_append_mbuf(sg, m); 2519 if (error) { 2520 m = m_defrag(m, M_NOWAIT); 2521 if (m == NULL) 2522 goto fail; 2523 2524 *m_head = m; 2525 sc->vtnet_stats.tx_defragged++; 2526 2527 error = sglist_append_mbuf(sg, m); 2528 if (error) 2529 goto fail; 2530 } 2531 2532 txhdr->vth_mbuf = m; 2533 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2534 2535 return (error); 2536 2537 fail: 2538 sc->vtnet_stats.tx_defrag_failed++; 2539 m_freem(*m_head); 2540 *m_head = NULL; 2541 2542 return (ENOBUFS); 2543 } 2544 2545 static int 2546 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2547 { 2548 struct vtnet_tx_header *txhdr; 2549 struct virtio_net_hdr *hdr; 2550 struct mbuf *m; 2551 int error; 2552 2553 m = *m_head; 2554 M_ASSERTPKTHDR(m); 2555 2556 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2557 if (txhdr == NULL) { 2558 m_freem(m); 2559 *m_head = NULL; 2560 return (ENOMEM); 2561 } 2562 2563 /* 2564 * Always use the non-mergeable header, regardless if mergable headers 2565 * were negotiated, because for transmit num_buffers is always zero. 2566 * The vtnet_hdr_size is used to enqueue the right header size segment. 2567 */ 2568 hdr = &txhdr->vth_uhdr.hdr; 2569 2570 if (m->m_flags & M_VLANTAG) { 2571 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2572 if ((*m_head = m) == NULL) { 2573 error = ENOBUFS; 2574 goto fail; 2575 } 2576 m->m_flags &= ~M_VLANTAG; 2577 } 2578 2579 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2580 m = vtnet_txq_offload(txq, m, hdr); 2581 if ((*m_head = m) == NULL) { 2582 error = ENOBUFS; 2583 goto fail; 2584 } 2585 } 2586 2587 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2588 fail: 2589 if (error) 2590 uma_zfree(vtnet_tx_header_zone, txhdr); 2591 2592 return (error); 2593 } 2594 2595 #ifdef VTNET_LEGACY_TX 2596 2597 static void 2598 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2599 { 2600 struct vtnet_softc *sc; 2601 struct virtqueue *vq; 2602 struct mbuf *m0; 2603 int tries, enq; 2604 2605 sc = txq->vtntx_sc; 2606 vq = txq->vtntx_vq; 2607 tries = 0; 2608 2609 VTNET_TXQ_LOCK_ASSERT(txq); 2610 2611 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2612 sc->vtnet_link_active == 0) 2613 return; 2614 2615 vtnet_txq_eof(txq); 2616 2617 again: 2618 enq = 0; 2619 2620 while (!if_sendq_empty(ifp)) { 2621 if (virtqueue_full(vq)) 2622 break; 2623 2624 m0 = if_dequeue(ifp); 2625 if (m0 == NULL) 2626 break; 2627 2628 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2629 if (m0 != NULL) 2630 if_sendq_prepend(ifp, m0); 2631 break; 2632 } 2633 2634 enq++; 2635 ETHER_BPF_MTAP(ifp, m0); 2636 } 2637 2638 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2639 if (tries++ < VTNET_NOTIFY_RETRIES) 2640 goto again; 2641 2642 txq->vtntx_stats.vtxs_rescheduled++; 2643 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2644 } 2645 } 2646 2647 static void 2648 vtnet_start(if_t ifp) 2649 { 2650 struct vtnet_softc *sc; 2651 struct vtnet_txq *txq; 2652 2653 sc = if_getsoftc(ifp); 2654 txq = &sc->vtnet_txqs[0]; 2655 2656 VTNET_TXQ_LOCK(txq); 2657 vtnet_start_locked(txq, ifp); 2658 VTNET_TXQ_UNLOCK(txq); 2659 } 2660 2661 #else /* !VTNET_LEGACY_TX */ 2662 2663 static int 2664 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2665 { 2666 struct vtnet_softc *sc; 2667 struct virtqueue *vq; 2668 struct buf_ring *br; 2669 if_t ifp; 2670 int enq, tries, error; 2671 2672 sc = txq->vtntx_sc; 2673 vq = txq->vtntx_vq; 2674 br = txq->vtntx_br; 2675 ifp = sc->vtnet_ifp; 2676 tries = 0; 2677 error = 0; 2678 2679 VTNET_TXQ_LOCK_ASSERT(txq); 2680 2681 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2682 sc->vtnet_link_active == 0) { 2683 if (m != NULL) 2684 error = drbr_enqueue(ifp, br, m); 2685 return (error); 2686 } 2687 2688 if (m != NULL) { 2689 error = drbr_enqueue(ifp, br, m); 2690 if (error) 2691 return (error); 2692 } 2693 2694 vtnet_txq_eof(txq); 2695 2696 again: 2697 enq = 0; 2698 2699 while ((m = drbr_peek(ifp, br)) != NULL) { 2700 if (virtqueue_full(vq)) { 2701 drbr_putback(ifp, br, m); 2702 break; 2703 } 2704 2705 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2706 if (m != NULL) 2707 drbr_putback(ifp, br, m); 2708 else 2709 drbr_advance(ifp, br); 2710 break; 2711 } 2712 drbr_advance(ifp, br); 2713 2714 enq++; 2715 ETHER_BPF_MTAP(ifp, m); 2716 } 2717 2718 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2719 if (tries++ < VTNET_NOTIFY_RETRIES) 2720 goto again; 2721 2722 txq->vtntx_stats.vtxs_rescheduled++; 2723 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2724 } 2725 2726 return (0); 2727 } 2728 2729 static int 2730 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2731 { 2732 struct vtnet_softc *sc; 2733 struct vtnet_txq *txq; 2734 int i, npairs, error; 2735 2736 sc = if_getsoftc(ifp); 2737 npairs = sc->vtnet_act_vq_pairs; 2738 2739 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2740 i = m->m_pkthdr.flowid % npairs; 2741 else 2742 i = curcpu % npairs; 2743 2744 txq = &sc->vtnet_txqs[i]; 2745 2746 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2747 error = vtnet_txq_mq_start_locked(txq, m); 2748 VTNET_TXQ_UNLOCK(txq); 2749 } else { 2750 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2751 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2752 } 2753 2754 return (error); 2755 } 2756 2757 static void 2758 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2759 { 2760 struct vtnet_softc *sc; 2761 struct vtnet_txq *txq; 2762 2763 txq = xtxq; 2764 sc = txq->vtntx_sc; 2765 2766 VTNET_TXQ_LOCK(txq); 2767 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2768 vtnet_txq_mq_start_locked(txq, NULL); 2769 VTNET_TXQ_UNLOCK(txq); 2770 } 2771 2772 #endif /* VTNET_LEGACY_TX */ 2773 2774 static void 2775 vtnet_txq_start(struct vtnet_txq *txq) 2776 { 2777 struct vtnet_softc *sc; 2778 if_t ifp; 2779 2780 sc = txq->vtntx_sc; 2781 ifp = sc->vtnet_ifp; 2782 2783 #ifdef VTNET_LEGACY_TX 2784 if (!if_sendq_empty(ifp)) 2785 vtnet_start_locked(txq, ifp); 2786 #else 2787 if (!drbr_empty(ifp, txq->vtntx_br)) 2788 vtnet_txq_mq_start_locked(txq, NULL); 2789 #endif 2790 } 2791 2792 static void 2793 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2794 { 2795 struct vtnet_softc *sc; 2796 struct vtnet_txq *txq; 2797 if_t ifp; 2798 2799 txq = xtxq; 2800 sc = txq->vtntx_sc; 2801 ifp = sc->vtnet_ifp; 2802 2803 VTNET_TXQ_LOCK(txq); 2804 2805 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2806 VTNET_TXQ_UNLOCK(txq); 2807 return; 2808 } 2809 2810 vtnet_txq_eof(txq); 2811 vtnet_txq_start(txq); 2812 2813 VTNET_TXQ_UNLOCK(txq); 2814 } 2815 2816 static int 2817 vtnet_txq_eof(struct vtnet_txq *txq) 2818 { 2819 struct virtqueue *vq; 2820 struct vtnet_tx_header *txhdr; 2821 struct mbuf *m; 2822 int deq; 2823 2824 vq = txq->vtntx_vq; 2825 deq = 0; 2826 VTNET_TXQ_LOCK_ASSERT(txq); 2827 2828 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2829 m = txhdr->vth_mbuf; 2830 deq++; 2831 2832 txq->vtntx_stats.vtxs_opackets++; 2833 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2834 if (m->m_flags & M_MCAST) 2835 txq->vtntx_stats.vtxs_omcasts++; 2836 2837 m_freem(m); 2838 uma_zfree(vtnet_tx_header_zone, txhdr); 2839 } 2840 2841 if (virtqueue_empty(vq)) 2842 txq->vtntx_watchdog = 0; 2843 2844 return (deq); 2845 } 2846 2847 static void 2848 vtnet_tx_vq_intr(void *xtxq) 2849 { 2850 struct vtnet_softc *sc; 2851 struct vtnet_txq *txq; 2852 if_t ifp; 2853 2854 txq = xtxq; 2855 sc = txq->vtntx_sc; 2856 ifp = sc->vtnet_ifp; 2857 2858 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2859 /* 2860 * Ignore this interrupt. Either this is a spurious interrupt 2861 * or multiqueue without per-VQ MSIX so every queue needs to 2862 * be polled (a brain dead configuration we could try harder 2863 * to avoid). 2864 */ 2865 vtnet_txq_disable_intr(txq); 2866 return; 2867 } 2868 2869 #ifdef DEV_NETMAP 2870 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2871 return; 2872 #endif /* DEV_NETMAP */ 2873 2874 VTNET_TXQ_LOCK(txq); 2875 2876 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2877 VTNET_TXQ_UNLOCK(txq); 2878 return; 2879 } 2880 2881 vtnet_txq_eof(txq); 2882 vtnet_txq_start(txq); 2883 2884 VTNET_TXQ_UNLOCK(txq); 2885 } 2886 2887 static void 2888 vtnet_tx_start_all(struct vtnet_softc *sc) 2889 { 2890 struct vtnet_txq *txq; 2891 int i; 2892 2893 VTNET_CORE_LOCK_ASSERT(sc); 2894 2895 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2896 txq = &sc->vtnet_txqs[i]; 2897 2898 VTNET_TXQ_LOCK(txq); 2899 vtnet_txq_start(txq); 2900 VTNET_TXQ_UNLOCK(txq); 2901 } 2902 } 2903 2904 #ifndef VTNET_LEGACY_TX 2905 static void 2906 vtnet_qflush(if_t ifp) 2907 { 2908 struct vtnet_softc *sc; 2909 struct vtnet_txq *txq; 2910 struct mbuf *m; 2911 int i; 2912 2913 sc = if_getsoftc(ifp); 2914 2915 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2916 txq = &sc->vtnet_txqs[i]; 2917 2918 VTNET_TXQ_LOCK(txq); 2919 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2920 m_freem(m); 2921 VTNET_TXQ_UNLOCK(txq); 2922 } 2923 2924 if_qflush(ifp); 2925 } 2926 #endif 2927 2928 static int 2929 vtnet_watchdog(struct vtnet_txq *txq) 2930 { 2931 if_t ifp; 2932 2933 ifp = txq->vtntx_sc->vtnet_ifp; 2934 2935 VTNET_TXQ_LOCK(txq); 2936 if (txq->vtntx_watchdog == 1) { 2937 /* 2938 * Only drain completed frames if the watchdog is about to 2939 * expire. If any frames were drained, there may be enough 2940 * free descriptors now available to transmit queued frames. 2941 * In that case, the timer will immediately be decremented 2942 * below, but the timeout is generous enough that should not 2943 * be a problem. 2944 */ 2945 if (vtnet_txq_eof(txq) != 0) 2946 vtnet_txq_start(txq); 2947 } 2948 2949 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2950 VTNET_TXQ_UNLOCK(txq); 2951 return (0); 2952 } 2953 VTNET_TXQ_UNLOCK(txq); 2954 2955 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2956 return (1); 2957 } 2958 2959 static void 2960 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2961 struct vtnet_txq_stats *txacc) 2962 { 2963 2964 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2965 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2966 2967 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2968 struct vtnet_rxq_stats *rxst; 2969 struct vtnet_txq_stats *txst; 2970 2971 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2972 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2973 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2974 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2975 rxacc->vrxs_csum += rxst->vrxs_csum; 2976 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2977 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2978 2979 txst = &sc->vtnet_txqs[i].vtntx_stats; 2980 txacc->vtxs_opackets += txst->vtxs_opackets; 2981 txacc->vtxs_obytes += txst->vtxs_obytes; 2982 txacc->vtxs_csum += txst->vtxs_csum; 2983 txacc->vtxs_tso += txst->vtxs_tso; 2984 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2985 } 2986 } 2987 2988 static uint64_t 2989 vtnet_get_counter(if_t ifp, ift_counter cnt) 2990 { 2991 struct vtnet_softc *sc; 2992 struct vtnet_rxq_stats rxaccum; 2993 struct vtnet_txq_stats txaccum; 2994 2995 sc = if_getsoftc(ifp); 2996 vtnet_accum_stats(sc, &rxaccum, &txaccum); 2997 2998 switch (cnt) { 2999 case IFCOUNTER_IPACKETS: 3000 return (rxaccum.vrxs_ipackets); 3001 case IFCOUNTER_IQDROPS: 3002 return (rxaccum.vrxs_iqdrops); 3003 case IFCOUNTER_IERRORS: 3004 return (rxaccum.vrxs_ierrors); 3005 case IFCOUNTER_OPACKETS: 3006 return (txaccum.vtxs_opackets); 3007 #ifndef VTNET_LEGACY_TX 3008 case IFCOUNTER_OBYTES: 3009 return (txaccum.vtxs_obytes); 3010 case IFCOUNTER_OMCASTS: 3011 return (txaccum.vtxs_omcasts); 3012 #endif 3013 default: 3014 return (if_get_counter_default(ifp, cnt)); 3015 } 3016 } 3017 3018 static void 3019 vtnet_tick(void *xsc) 3020 { 3021 struct vtnet_softc *sc; 3022 if_t ifp; 3023 int i, timedout; 3024 3025 sc = xsc; 3026 ifp = sc->vtnet_ifp; 3027 timedout = 0; 3028 3029 VTNET_CORE_LOCK_ASSERT(sc); 3030 3031 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3032 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3033 3034 if (timedout != 0) { 3035 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3036 vtnet_init_locked(sc, 0); 3037 } else 3038 callout_schedule(&sc->vtnet_tick_ch, hz); 3039 } 3040 3041 static void 3042 vtnet_start_taskqueues(struct vtnet_softc *sc) 3043 { 3044 device_t dev; 3045 struct vtnet_rxq *rxq; 3046 struct vtnet_txq *txq; 3047 int i, error; 3048 3049 dev = sc->vtnet_dev; 3050 3051 /* 3052 * Errors here are very difficult to recover from - we cannot 3053 * easily fail because, if this is during boot, we will hang 3054 * when freeing any successfully started taskqueues because 3055 * the scheduler isn't up yet. 3056 * 3057 * Most drivers just ignore the return value - it only fails 3058 * with ENOMEM so an error is not likely. 3059 */ 3060 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3061 rxq = &sc->vtnet_rxqs[i]; 3062 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3063 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3064 if (error) { 3065 device_printf(dev, "failed to start rx taskq %d\n", 3066 rxq->vtnrx_id); 3067 } 3068 3069 txq = &sc->vtnet_txqs[i]; 3070 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3071 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3072 if (error) { 3073 device_printf(dev, "failed to start tx taskq %d\n", 3074 txq->vtntx_id); 3075 } 3076 } 3077 } 3078 3079 static void 3080 vtnet_free_taskqueues(struct vtnet_softc *sc) 3081 { 3082 struct vtnet_rxq *rxq; 3083 struct vtnet_txq *txq; 3084 int i; 3085 3086 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3087 rxq = &sc->vtnet_rxqs[i]; 3088 if (rxq->vtnrx_tq != NULL) { 3089 taskqueue_free(rxq->vtnrx_tq); 3090 rxq->vtnrx_tq = NULL; 3091 } 3092 3093 txq = &sc->vtnet_txqs[i]; 3094 if (txq->vtntx_tq != NULL) { 3095 taskqueue_free(txq->vtntx_tq); 3096 txq->vtntx_tq = NULL; 3097 } 3098 } 3099 } 3100 3101 static void 3102 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3103 { 3104 struct vtnet_rxq *rxq; 3105 struct vtnet_txq *txq; 3106 int i; 3107 3108 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3109 rxq = &sc->vtnet_rxqs[i]; 3110 if (rxq->vtnrx_tq != NULL) 3111 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3112 3113 txq = &sc->vtnet_txqs[i]; 3114 if (txq->vtntx_tq != NULL) { 3115 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3116 #ifndef VTNET_LEGACY_TX 3117 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3118 #endif 3119 } 3120 } 3121 } 3122 3123 static void 3124 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3125 { 3126 struct vtnet_rxq *rxq; 3127 struct vtnet_txq *txq; 3128 int i; 3129 3130 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3131 rxq = &sc->vtnet_rxqs[i]; 3132 vtnet_rxq_free_mbufs(rxq); 3133 3134 txq = &sc->vtnet_txqs[i]; 3135 vtnet_txq_free_mbufs(txq); 3136 } 3137 } 3138 3139 static void 3140 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3141 { 3142 struct vtnet_rxq *rxq; 3143 struct vtnet_txq *txq; 3144 int i; 3145 3146 VTNET_CORE_LOCK_ASSERT(sc); 3147 3148 /* 3149 * Lock and unlock the per-queue mutex so we known the stop 3150 * state is visible. Doing only the active queues should be 3151 * sufficient, but it does not cost much extra to do all the 3152 * queues. 3153 */ 3154 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3155 rxq = &sc->vtnet_rxqs[i]; 3156 VTNET_RXQ_LOCK(rxq); 3157 VTNET_RXQ_UNLOCK(rxq); 3158 3159 txq = &sc->vtnet_txqs[i]; 3160 VTNET_TXQ_LOCK(txq); 3161 VTNET_TXQ_UNLOCK(txq); 3162 } 3163 } 3164 3165 static void 3166 vtnet_stop(struct vtnet_softc *sc) 3167 { 3168 device_t dev; 3169 if_t ifp; 3170 3171 dev = sc->vtnet_dev; 3172 ifp = sc->vtnet_ifp; 3173 3174 VTNET_CORE_LOCK_ASSERT(sc); 3175 3176 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3177 sc->vtnet_link_active = 0; 3178 callout_stop(&sc->vtnet_tick_ch); 3179 3180 /* Only advisory. */ 3181 vtnet_disable_interrupts(sc); 3182 3183 #ifdef DEV_NETMAP 3184 /* Stop any pending txsync/rxsync and disable them. */ 3185 netmap_disable_all_rings(ifp); 3186 #endif /* DEV_NETMAP */ 3187 3188 /* 3189 * Stop the host adapter. This resets it to the pre-initialized 3190 * state. It will not generate any interrupts until after it is 3191 * reinitialized. 3192 */ 3193 virtio_stop(dev); 3194 vtnet_stop_rendezvous(sc); 3195 3196 vtnet_drain_rxtx_queues(sc); 3197 sc->vtnet_act_vq_pairs = 1; 3198 } 3199 3200 static int 3201 vtnet_virtio_reinit(struct vtnet_softc *sc) 3202 { 3203 device_t dev; 3204 if_t ifp; 3205 uint64_t features; 3206 int error; 3207 3208 dev = sc->vtnet_dev; 3209 ifp = sc->vtnet_ifp; 3210 features = sc->vtnet_negotiated_features; 3211 3212 /* 3213 * Re-negotiate with the host, removing any disabled receive 3214 * features. Transmit features are disabled only on our side 3215 * via if_capenable and if_hwassist. 3216 */ 3217 3218 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3219 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3220 3221 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3222 features &= ~VTNET_LRO_FEATURES; 3223 3224 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3225 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3226 3227 error = virtio_reinit(dev, features); 3228 if (error) { 3229 device_printf(dev, "virtio reinit error %d\n", error); 3230 return (error); 3231 } 3232 3233 sc->vtnet_features = features; 3234 virtio_reinit_complete(dev); 3235 3236 return (0); 3237 } 3238 3239 static void 3240 vtnet_init_rx_filters(struct vtnet_softc *sc) 3241 { 3242 if_t ifp; 3243 3244 ifp = sc->vtnet_ifp; 3245 3246 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3247 vtnet_rx_filter(sc); 3248 vtnet_rx_filter_mac(sc); 3249 } 3250 3251 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3252 vtnet_rx_filter_vlan(sc); 3253 } 3254 3255 static int 3256 vtnet_init_rx_queues(struct vtnet_softc *sc) 3257 { 3258 device_t dev; 3259 if_t ifp; 3260 struct vtnet_rxq *rxq; 3261 int i, clustersz, error; 3262 3263 dev = sc->vtnet_dev; 3264 ifp = sc->vtnet_ifp; 3265 3266 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3267 sc->vtnet_rx_clustersz = clustersz; 3268 3269 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3270 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3271 VTNET_MAX_RX_SIZE, clustersz); 3272 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3273 ("%s: too many rx mbufs %d for %d segments", __func__, 3274 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3275 } else 3276 sc->vtnet_rx_nmbufs = 1; 3277 3278 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3279 rxq = &sc->vtnet_rxqs[i]; 3280 3281 /* Hold the lock to satisfy asserts. */ 3282 VTNET_RXQ_LOCK(rxq); 3283 error = vtnet_rxq_populate(rxq); 3284 VTNET_RXQ_UNLOCK(rxq); 3285 3286 if (error) { 3287 device_printf(dev, "cannot populate Rx queue %d\n", i); 3288 return (error); 3289 } 3290 } 3291 3292 return (0); 3293 } 3294 3295 static int 3296 vtnet_init_tx_queues(struct vtnet_softc *sc) 3297 { 3298 struct vtnet_txq *txq; 3299 int i; 3300 3301 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3302 txq = &sc->vtnet_txqs[i]; 3303 txq->vtntx_watchdog = 0; 3304 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3305 #ifdef DEV_NETMAP 3306 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3307 #endif /* DEV_NETMAP */ 3308 } 3309 3310 return (0); 3311 } 3312 3313 static int 3314 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3315 { 3316 int error; 3317 3318 error = vtnet_init_rx_queues(sc); 3319 if (error) 3320 return (error); 3321 3322 error = vtnet_init_tx_queues(sc); 3323 if (error) 3324 return (error); 3325 3326 return (0); 3327 } 3328 3329 static void 3330 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3331 { 3332 device_t dev; 3333 int npairs; 3334 3335 dev = sc->vtnet_dev; 3336 3337 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3338 sc->vtnet_act_vq_pairs = 1; 3339 return; 3340 } 3341 3342 npairs = sc->vtnet_req_vq_pairs; 3343 3344 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3345 device_printf(dev, "cannot set active queue pairs to %d, " 3346 "falling back to 1 queue pair\n", npairs); 3347 npairs = 1; 3348 } 3349 3350 sc->vtnet_act_vq_pairs = npairs; 3351 } 3352 3353 static void 3354 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3355 { 3356 if_t ifp; 3357 uint64_t features; 3358 int error; 3359 3360 ifp = sc->vtnet_ifp; 3361 features = sc->vtnet_features; 3362 3363 VTNET_CORE_LOCK_ASSERT(sc); 3364 3365 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3366 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3367 features |= VIRTIO_NET_F_GUEST_CSUM; 3368 else 3369 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3370 } 3371 3372 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3373 if (if_getcapenable(ifp) & IFCAP_LRO) 3374 features |= VTNET_LRO_FEATURES; 3375 else 3376 features &= ~VTNET_LRO_FEATURES; 3377 } 3378 3379 error = vtnet_ctrl_guest_offloads(sc, 3380 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3381 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3382 VIRTIO_NET_F_GUEST_UFO)); 3383 if (error) { 3384 device_printf(sc->vtnet_dev, 3385 "%s: cannot update Rx features\n", __func__); 3386 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3387 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3388 vtnet_init_locked(sc, 0); 3389 } 3390 } else 3391 sc->vtnet_features = features; 3392 } 3393 3394 static int 3395 vtnet_reinit(struct vtnet_softc *sc) 3396 { 3397 if_t ifp; 3398 int error; 3399 3400 ifp = sc->vtnet_ifp; 3401 3402 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3403 3404 error = vtnet_virtio_reinit(sc); 3405 if (error) 3406 return (error); 3407 3408 vtnet_set_macaddr(sc); 3409 vtnet_set_active_vq_pairs(sc); 3410 3411 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3412 vtnet_init_rx_filters(sc); 3413 3414 if_sethwassist(ifp, 0); 3415 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3416 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3417 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3418 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3419 if (if_getcapenable(ifp) & IFCAP_TSO4) 3420 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3421 if (if_getcapenable(ifp) & IFCAP_TSO6) 3422 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3423 3424 error = vtnet_init_rxtx_queues(sc); 3425 if (error) 3426 return (error); 3427 3428 return (0); 3429 } 3430 3431 static void 3432 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3433 { 3434 if_t ifp; 3435 3436 ifp = sc->vtnet_ifp; 3437 3438 VTNET_CORE_LOCK_ASSERT(sc); 3439 3440 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3441 return; 3442 3443 vtnet_stop(sc); 3444 3445 #ifdef DEV_NETMAP 3446 /* Once stopped we can update the netmap flags, if necessary. */ 3447 switch (init_mode) { 3448 case VTNET_INIT_NETMAP_ENTER: 3449 nm_set_native_flags(NA(ifp)); 3450 break; 3451 case VTNET_INIT_NETMAP_EXIT: 3452 nm_clear_native_flags(NA(ifp)); 3453 break; 3454 } 3455 #endif /* DEV_NETMAP */ 3456 3457 if (vtnet_reinit(sc) != 0) { 3458 vtnet_stop(sc); 3459 return; 3460 } 3461 3462 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3463 vtnet_update_link_status(sc); 3464 vtnet_enable_interrupts(sc); 3465 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3466 3467 #ifdef DEV_NETMAP 3468 /* Re-enable txsync/rxsync. */ 3469 netmap_enable_all_rings(ifp); 3470 #endif /* DEV_NETMAP */ 3471 } 3472 3473 static void 3474 vtnet_init(void *xsc) 3475 { 3476 struct vtnet_softc *sc; 3477 3478 sc = xsc; 3479 3480 VTNET_CORE_LOCK(sc); 3481 vtnet_init_locked(sc, 0); 3482 VTNET_CORE_UNLOCK(sc); 3483 } 3484 3485 static void 3486 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3487 { 3488 3489 /* 3490 * The control virtqueue is only polled and therefore it should 3491 * already be empty. 3492 */ 3493 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3494 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3495 } 3496 3497 static void 3498 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3499 struct sglist *sg, int readable, int writable) 3500 { 3501 struct virtqueue *vq; 3502 3503 vq = sc->vtnet_ctrl_vq; 3504 3505 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3506 VTNET_CORE_LOCK_ASSERT(sc); 3507 3508 if (!virtqueue_empty(vq)) 3509 return; 3510 3511 /* 3512 * Poll for the response, but the command is likely completed before 3513 * returning from the notify. 3514 */ 3515 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3516 virtqueue_notify(vq); 3517 virtqueue_poll(vq, NULL); 3518 } 3519 } 3520 3521 static int 3522 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3523 { 3524 struct sglist_seg segs[3]; 3525 struct sglist sg; 3526 struct { 3527 struct virtio_net_ctrl_hdr hdr __aligned(2); 3528 uint8_t pad1; 3529 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3530 uint8_t pad2; 3531 uint8_t ack; 3532 } s; 3533 int error; 3534 3535 error = 0; 3536 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3537 3538 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3539 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3540 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3541 s.ack = VIRTIO_NET_ERR; 3542 3543 sglist_init(&sg, nitems(segs), segs); 3544 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3545 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3546 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3547 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3548 3549 if (error == 0) 3550 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3551 3552 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3553 } 3554 3555 static int 3556 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3557 { 3558 struct sglist_seg segs[3]; 3559 struct sglist sg; 3560 struct { 3561 struct virtio_net_ctrl_hdr hdr __aligned(2); 3562 uint8_t pad1; 3563 uint64_t offloads __aligned(8); 3564 uint8_t pad2; 3565 uint8_t ack; 3566 } s; 3567 int error; 3568 3569 error = 0; 3570 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3571 3572 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3573 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3574 s.offloads = vtnet_gtoh64(sc, offloads); 3575 s.ack = VIRTIO_NET_ERR; 3576 3577 sglist_init(&sg, nitems(segs), segs); 3578 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3579 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3580 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3581 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3582 3583 if (error == 0) 3584 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3585 3586 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3587 } 3588 3589 static int 3590 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3591 { 3592 struct sglist_seg segs[3]; 3593 struct sglist sg; 3594 struct { 3595 struct virtio_net_ctrl_hdr hdr __aligned(2); 3596 uint8_t pad1; 3597 struct virtio_net_ctrl_mq mq __aligned(2); 3598 uint8_t pad2; 3599 uint8_t ack; 3600 } s; 3601 int error; 3602 3603 error = 0; 3604 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3605 3606 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3607 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3608 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3609 s.ack = VIRTIO_NET_ERR; 3610 3611 sglist_init(&sg, nitems(segs), segs); 3612 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3613 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3614 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3615 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3616 3617 if (error == 0) 3618 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3619 3620 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3621 } 3622 3623 static int 3624 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3625 { 3626 struct sglist_seg segs[3]; 3627 struct sglist sg; 3628 struct { 3629 struct virtio_net_ctrl_hdr hdr __aligned(2); 3630 uint8_t pad1; 3631 uint8_t onoff; 3632 uint8_t pad2; 3633 uint8_t ack; 3634 } s; 3635 int error; 3636 3637 error = 0; 3638 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3639 3640 s.hdr.class = VIRTIO_NET_CTRL_RX; 3641 s.hdr.cmd = cmd; 3642 s.onoff = on; 3643 s.ack = VIRTIO_NET_ERR; 3644 3645 sglist_init(&sg, nitems(segs), segs); 3646 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3647 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3648 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3649 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3650 3651 if (error == 0) 3652 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3653 3654 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3655 } 3656 3657 static int 3658 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3659 { 3660 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3661 } 3662 3663 static int 3664 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3665 { 3666 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3667 } 3668 3669 static void 3670 vtnet_rx_filter(struct vtnet_softc *sc) 3671 { 3672 device_t dev; 3673 if_t ifp; 3674 3675 dev = sc->vtnet_dev; 3676 ifp = sc->vtnet_ifp; 3677 3678 VTNET_CORE_LOCK_ASSERT(sc); 3679 3680 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3681 device_printf(dev, "cannot %s promiscuous mode\n", 3682 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3683 } 3684 3685 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3686 device_printf(dev, "cannot %s all-multicast mode\n", 3687 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3688 } 3689 } 3690 3691 static u_int 3692 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3693 { 3694 struct vtnet_softc *sc = arg; 3695 3696 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3697 return (0); 3698 3699 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3700 bcopy(LLADDR(sdl), 3701 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3702 ETHER_ADDR_LEN); 3703 3704 return (1); 3705 } 3706 3707 static u_int 3708 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3709 { 3710 struct vtnet_mac_filter *filter = arg; 3711 3712 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3713 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3714 ETHER_ADDR_LEN); 3715 3716 return (1); 3717 } 3718 3719 static void 3720 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3721 { 3722 struct virtio_net_ctrl_hdr hdr __aligned(2); 3723 struct vtnet_mac_filter *filter; 3724 struct sglist_seg segs[4]; 3725 struct sglist sg; 3726 if_t ifp; 3727 bool promisc, allmulti; 3728 u_int ucnt, mcnt; 3729 int error; 3730 uint8_t ack; 3731 3732 ifp = sc->vtnet_ifp; 3733 filter = sc->vtnet_mac_filter; 3734 error = 0; 3735 3736 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3737 VTNET_CORE_LOCK_ASSERT(sc); 3738 3739 /* Unicast MAC addresses: */ 3740 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3741 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3742 3743 if (promisc) { 3744 ucnt = 0; 3745 if_printf(ifp, "more than %d MAC addresses assigned, " 3746 "falling back to promiscuous mode\n", 3747 VTNET_MAX_MAC_ENTRIES); 3748 } 3749 3750 /* Multicast MAC addresses: */ 3751 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3752 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3753 3754 if (allmulti) { 3755 mcnt = 0; 3756 if_printf(ifp, "more than %d multicast MAC addresses " 3757 "assigned, falling back to all-multicast mode\n", 3758 VTNET_MAX_MAC_ENTRIES); 3759 } 3760 3761 if (promisc && allmulti) 3762 goto out; 3763 3764 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3765 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3766 3767 hdr.class = VIRTIO_NET_CTRL_MAC; 3768 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3769 ack = VIRTIO_NET_ERR; 3770 3771 sglist_init(&sg, nitems(segs), segs); 3772 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3773 error |= sglist_append(&sg, &filter->vmf_unicast, 3774 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3775 error |= sglist_append(&sg, &filter->vmf_multicast, 3776 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3777 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3778 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3779 3780 if (error == 0) 3781 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3782 if (ack != VIRTIO_NET_OK) 3783 if_printf(ifp, "error setting host MAC filter table\n"); 3784 3785 out: 3786 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3787 if_printf(ifp, "cannot enable promiscuous mode\n"); 3788 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3789 if_printf(ifp, "cannot enable all-multicast mode\n"); 3790 } 3791 3792 static int 3793 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3794 { 3795 struct sglist_seg segs[3]; 3796 struct sglist sg; 3797 struct { 3798 struct virtio_net_ctrl_hdr hdr __aligned(2); 3799 uint8_t pad1; 3800 uint16_t tag __aligned(2); 3801 uint8_t pad2; 3802 uint8_t ack; 3803 } s; 3804 int error; 3805 3806 error = 0; 3807 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3808 3809 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3810 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3811 s.tag = vtnet_gtoh16(sc, tag); 3812 s.ack = VIRTIO_NET_ERR; 3813 3814 sglist_init(&sg, nitems(segs), segs); 3815 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3816 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3817 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3818 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3819 3820 if (error == 0) 3821 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3822 3823 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3824 } 3825 3826 static void 3827 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3828 { 3829 int i, bit; 3830 uint32_t w; 3831 uint16_t tag; 3832 3833 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3834 VTNET_CORE_LOCK_ASSERT(sc); 3835 3836 /* Enable the filter for each configured VLAN. */ 3837 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3838 w = sc->vtnet_vlan_filter[i]; 3839 3840 while ((bit = ffs(w) - 1) != -1) { 3841 w &= ~(1 << bit); 3842 tag = sizeof(w) * CHAR_BIT * i + bit; 3843 3844 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3845 device_printf(sc->vtnet_dev, 3846 "cannot enable VLAN %d filter\n", tag); 3847 } 3848 } 3849 } 3850 } 3851 3852 static void 3853 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3854 { 3855 if_t ifp; 3856 int idx, bit; 3857 3858 ifp = sc->vtnet_ifp; 3859 idx = (tag >> 5) & 0x7F; 3860 bit = tag & 0x1F; 3861 3862 if (tag == 0 || tag > 4095) 3863 return; 3864 3865 VTNET_CORE_LOCK(sc); 3866 3867 if (add) 3868 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3869 else 3870 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3871 3872 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3873 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3874 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3875 device_printf(sc->vtnet_dev, 3876 "cannot %s VLAN %d %s the host filter table\n", 3877 add ? "add" : "remove", tag, add ? "to" : "from"); 3878 } 3879 3880 VTNET_CORE_UNLOCK(sc); 3881 } 3882 3883 static void 3884 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3885 { 3886 3887 if (if_getsoftc(ifp) != arg) 3888 return; 3889 3890 vtnet_update_vlan_filter(arg, 1, tag); 3891 } 3892 3893 static void 3894 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3895 { 3896 3897 if (if_getsoftc(ifp) != arg) 3898 return; 3899 3900 vtnet_update_vlan_filter(arg, 0, tag); 3901 } 3902 3903 static void 3904 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3905 { 3906 if_t ifp; 3907 uint32_t speed; 3908 3909 ifp = sc->vtnet_ifp; 3910 3911 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3912 return; 3913 3914 /* BMV: Ignore duplex. */ 3915 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3916 offsetof(struct virtio_net_config, speed)); 3917 if (speed != UINT32_MAX) 3918 if_setbaudrate(ifp, IF_Mbps(speed)); 3919 } 3920 3921 static int 3922 vtnet_is_link_up(struct vtnet_softc *sc) 3923 { 3924 uint16_t status; 3925 3926 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3927 return (1); 3928 3929 status = virtio_read_dev_config_2(sc->vtnet_dev, 3930 offsetof(struct virtio_net_config, status)); 3931 3932 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3933 } 3934 3935 static void 3936 vtnet_update_link_status(struct vtnet_softc *sc) 3937 { 3938 if_t ifp; 3939 int link; 3940 3941 ifp = sc->vtnet_ifp; 3942 VTNET_CORE_LOCK_ASSERT(sc); 3943 link = vtnet_is_link_up(sc); 3944 3945 /* Notify if the link status has changed. */ 3946 if (link != 0 && sc->vtnet_link_active == 0) { 3947 vtnet_update_speed_duplex(sc); 3948 sc->vtnet_link_active = 1; 3949 if_link_state_change(ifp, LINK_STATE_UP); 3950 } else if (link == 0 && sc->vtnet_link_active != 0) { 3951 sc->vtnet_link_active = 0; 3952 if_link_state_change(ifp, LINK_STATE_DOWN); 3953 } 3954 } 3955 3956 static int 3957 vtnet_ifmedia_upd(if_t ifp __unused) 3958 { 3959 return (EOPNOTSUPP); 3960 } 3961 3962 static void 3963 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 3964 { 3965 struct vtnet_softc *sc; 3966 3967 sc = if_getsoftc(ifp); 3968 3969 ifmr->ifm_status = IFM_AVALID; 3970 ifmr->ifm_active = IFM_ETHER; 3971 3972 VTNET_CORE_LOCK(sc); 3973 if (vtnet_is_link_up(sc) != 0) { 3974 ifmr->ifm_status |= IFM_ACTIVE; 3975 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3976 } else 3977 ifmr->ifm_active |= IFM_NONE; 3978 VTNET_CORE_UNLOCK(sc); 3979 } 3980 3981 static void 3982 vtnet_get_macaddr(struct vtnet_softc *sc) 3983 { 3984 3985 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3986 virtio_read_device_config_array(sc->vtnet_dev, 3987 offsetof(struct virtio_net_config, mac), 3988 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 3989 } else { 3990 /* Generate a random locally administered unicast address. */ 3991 sc->vtnet_hwaddr[0] = 0xB2; 3992 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 3993 } 3994 } 3995 3996 static void 3997 vtnet_set_macaddr(struct vtnet_softc *sc) 3998 { 3999 device_t dev; 4000 int error; 4001 4002 dev = sc->vtnet_dev; 4003 4004 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4005 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4006 if (error) 4007 device_printf(dev, "unable to set MAC address\n"); 4008 return; 4009 } 4010 4011 /* MAC in config is read-only in modern VirtIO. */ 4012 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4013 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4014 virtio_write_dev_config_1(dev, 4015 offsetof(struct virtio_net_config, mac) + i, 4016 sc->vtnet_hwaddr[i]); 4017 } 4018 } 4019 } 4020 4021 static void 4022 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4023 { 4024 4025 /* Assign MAC address if it was generated. */ 4026 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4027 vtnet_set_macaddr(sc); 4028 } 4029 4030 static void 4031 vtnet_vlan_tag_remove(struct mbuf *m) 4032 { 4033 struct ether_vlan_header *evh; 4034 4035 evh = mtod(m, struct ether_vlan_header *); 4036 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4037 m->m_flags |= M_VLANTAG; 4038 4039 /* Strip the 802.1Q header. */ 4040 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4041 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4042 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4043 } 4044 4045 static void 4046 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4047 { 4048 int limit; 4049 4050 limit = vtnet_tunable_int(sc, "rx_process_limit", 4051 vtnet_rx_process_limit); 4052 if (limit < 0) 4053 limit = INT_MAX; 4054 sc->vtnet_rx_process_limit = limit; 4055 } 4056 4057 static void 4058 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4059 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4060 { 4061 struct sysctl_oid *node; 4062 struct sysctl_oid_list *list; 4063 struct vtnet_rxq_stats *stats; 4064 char namebuf[16]; 4065 4066 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4067 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4068 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4069 list = SYSCTL_CHILDREN(node); 4070 4071 stats = &rxq->vtnrx_stats; 4072 4073 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4074 &stats->vrxs_ipackets, "Receive packets"); 4075 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4076 &stats->vrxs_ibytes, "Receive bytes"); 4077 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4078 &stats->vrxs_iqdrops, "Receive drops"); 4079 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4080 &stats->vrxs_ierrors, "Receive errors"); 4081 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4082 &stats->vrxs_csum, "Receive checksum offloaded"); 4083 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4084 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4085 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4086 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4087 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4088 &stats->vrxs_rescheduled, 4089 "Receive interrupt handler rescheduled"); 4090 } 4091 4092 static void 4093 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4094 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4095 { 4096 struct sysctl_oid *node; 4097 struct sysctl_oid_list *list; 4098 struct vtnet_txq_stats *stats; 4099 char namebuf[16]; 4100 4101 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4102 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4103 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4104 list = SYSCTL_CHILDREN(node); 4105 4106 stats = &txq->vtntx_stats; 4107 4108 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4109 &stats->vtxs_opackets, "Transmit packets"); 4110 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4111 &stats->vtxs_obytes, "Transmit bytes"); 4112 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4113 &stats->vtxs_omcasts, "Transmit multicasts"); 4114 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4115 &stats->vtxs_csum, "Transmit checksum offloaded"); 4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4117 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4119 &stats->vtxs_rescheduled, 4120 "Transmit interrupt handler rescheduled"); 4121 } 4122 4123 static void 4124 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4125 { 4126 device_t dev; 4127 struct sysctl_ctx_list *ctx; 4128 struct sysctl_oid *tree; 4129 struct sysctl_oid_list *child; 4130 int i; 4131 4132 dev = sc->vtnet_dev; 4133 ctx = device_get_sysctl_ctx(dev); 4134 tree = device_get_sysctl_tree(dev); 4135 child = SYSCTL_CHILDREN(tree); 4136 4137 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4138 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4139 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4140 } 4141 } 4142 4143 static void 4144 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4145 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4146 { 4147 struct vtnet_statistics *stats; 4148 struct vtnet_rxq_stats rxaccum; 4149 struct vtnet_txq_stats txaccum; 4150 4151 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4152 4153 stats = &sc->vtnet_stats; 4154 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4155 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4156 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4157 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4158 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4159 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4160 4161 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4162 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4163 "Mbuf cluster allocation failures"); 4164 4165 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4166 CTLFLAG_RD, &stats->rx_frame_too_large, 4167 "Received frame larger than the mbuf chain"); 4168 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4169 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4170 "Enqueuing the replacement receive mbuf failed"); 4171 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4172 CTLFLAG_RD, &stats->rx_mergeable_failed, 4173 "Mergeable buffers receive failures"); 4174 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4175 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4176 "Received checksum offloaded buffer with unsupported " 4177 "Ethernet type"); 4178 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4179 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4180 "Received checksum offloaded buffer with incorrect IP protocol"); 4181 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4182 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4183 "Received checksum offloaded buffer with incorrect offset"); 4184 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4185 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4186 "Received checksum offloaded buffer with incorrect protocol"); 4187 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4188 CTLFLAG_RD, &stats->rx_csum_failed, 4189 "Received buffer checksum offload failed"); 4190 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4191 CTLFLAG_RD, &stats->rx_csum_offloaded, 4192 "Received buffer checksum offload succeeded"); 4193 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4194 CTLFLAG_RD, &stats->rx_task_rescheduled, 4195 "Times the receive interrupt task rescheduled itself"); 4196 4197 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4198 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4199 "Aborted transmit of checksum offloaded buffer with unknown " 4200 "Ethernet type"); 4201 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4202 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4203 "Aborted transmit of checksum offloaded buffer because mismatched " 4204 "protocols"); 4205 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4206 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4207 "Aborted transmit of TSO buffer with non TCP protocol"); 4208 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4209 CTLFLAG_RD, &stats->tx_tso_without_csum, 4210 "Aborted transmit of TSO buffer without TCP checksum offload"); 4211 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4212 CTLFLAG_RD, &stats->tx_defragged, 4213 "Transmit mbufs defragged"); 4214 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4215 CTLFLAG_RD, &stats->tx_defrag_failed, 4216 "Aborted transmit of buffer because defrag failed"); 4217 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4218 CTLFLAG_RD, &stats->tx_csum_offloaded, 4219 "Offloaded checksum of transmitted buffer"); 4220 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4221 CTLFLAG_RD, &stats->tx_tso_offloaded, 4222 "Segmentation offload of transmitted buffer"); 4223 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4224 CTLFLAG_RD, &stats->tx_task_rescheduled, 4225 "Times the transmit interrupt task rescheduled itself"); 4226 } 4227 4228 static void 4229 vtnet_setup_sysctl(struct vtnet_softc *sc) 4230 { 4231 device_t dev; 4232 struct sysctl_ctx_list *ctx; 4233 struct sysctl_oid *tree; 4234 struct sysctl_oid_list *child; 4235 4236 dev = sc->vtnet_dev; 4237 ctx = device_get_sysctl_ctx(dev); 4238 tree = device_get_sysctl_tree(dev); 4239 child = SYSCTL_CHILDREN(tree); 4240 4241 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4242 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4243 "Number of maximum supported virtqueue pairs"); 4244 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4245 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4246 "Number of requested virtqueue pairs"); 4247 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4248 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4249 "Number of active virtqueue pairs"); 4250 4251 vtnet_setup_stat_sysctl(ctx, child, sc); 4252 } 4253 4254 static void 4255 vtnet_load_tunables(struct vtnet_softc *sc) 4256 { 4257 4258 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4259 "lro_entry_count", vtnet_lro_entry_count); 4260 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4261 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4262 4263 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4264 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4265 } 4266 4267 static int 4268 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4269 { 4270 4271 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4272 } 4273 4274 static void 4275 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4276 { 4277 4278 virtqueue_disable_intr(rxq->vtnrx_vq); 4279 } 4280 4281 static int 4282 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4283 { 4284 struct virtqueue *vq; 4285 4286 vq = txq->vtntx_vq; 4287 4288 if (vtnet_txq_below_threshold(txq) != 0) 4289 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4290 4291 /* 4292 * The free count is above our threshold. Keep the Tx interrupt 4293 * disabled until the queue is fuller. 4294 */ 4295 return (0); 4296 } 4297 4298 static void 4299 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4300 { 4301 4302 virtqueue_disable_intr(txq->vtntx_vq); 4303 } 4304 4305 static void 4306 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4307 { 4308 struct vtnet_rxq *rxq; 4309 int i; 4310 4311 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4312 rxq = &sc->vtnet_rxqs[i]; 4313 if (vtnet_rxq_enable_intr(rxq) != 0) 4314 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4315 } 4316 } 4317 4318 static void 4319 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4320 { 4321 int i; 4322 4323 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4324 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4325 } 4326 4327 static void 4328 vtnet_enable_interrupts(struct vtnet_softc *sc) 4329 { 4330 4331 vtnet_enable_rx_interrupts(sc); 4332 vtnet_enable_tx_interrupts(sc); 4333 } 4334 4335 static void 4336 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4337 { 4338 int i; 4339 4340 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4341 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4342 } 4343 4344 static void 4345 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4346 { 4347 int i; 4348 4349 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4350 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4351 } 4352 4353 static void 4354 vtnet_disable_interrupts(struct vtnet_softc *sc) 4355 { 4356 4357 vtnet_disable_rx_interrupts(sc); 4358 vtnet_disable_tx_interrupts(sc); 4359 } 4360 4361 static int 4362 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4363 { 4364 char path[64]; 4365 4366 snprintf(path, sizeof(path), 4367 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4368 TUNABLE_INT_FETCH(path, &def); 4369 4370 return (def); 4371 } 4372 4373 #ifdef DEBUGNET 4374 static void 4375 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4376 { 4377 struct vtnet_softc *sc; 4378 4379 sc = if_getsoftc(ifp); 4380 4381 VTNET_CORE_LOCK(sc); 4382 *nrxr = sc->vtnet_req_vq_pairs; 4383 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4384 *clsize = sc->vtnet_rx_clustersz; 4385 VTNET_CORE_UNLOCK(sc); 4386 } 4387 4388 static void 4389 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4390 { 4391 struct vtnet_softc *sc; 4392 static bool sw_lro_enabled = false; 4393 4394 /* 4395 * Disable software LRO, since it would require entering the network 4396 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4397 */ 4398 sc = if_getsoftc(ifp); 4399 switch (event) { 4400 case DEBUGNET_START: 4401 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4402 if (sw_lro_enabled) 4403 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4404 break; 4405 case DEBUGNET_END: 4406 if (sw_lro_enabled) 4407 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4408 break; 4409 } 4410 } 4411 4412 static int 4413 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4414 { 4415 struct vtnet_softc *sc; 4416 struct vtnet_txq *txq; 4417 int error; 4418 4419 sc = if_getsoftc(ifp); 4420 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4421 IFF_DRV_RUNNING) 4422 return (EBUSY); 4423 4424 txq = &sc->vtnet_txqs[0]; 4425 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4426 if (error == 0) 4427 (void)vtnet_txq_notify(txq); 4428 return (error); 4429 } 4430 4431 static int 4432 vtnet_debugnet_poll(if_t ifp, int count) 4433 { 4434 struct vtnet_softc *sc; 4435 int i; 4436 4437 sc = if_getsoftc(ifp); 4438 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4439 IFF_DRV_RUNNING) 4440 return (EBUSY); 4441 4442 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4443 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4444 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4445 return (0); 4446 } 4447 #endif /* DEBUGNET */ 4448