Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/network/if_vtnet.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/eventhandler.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/module.h> 42 #include <sys/msan.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/random.h> 46 #include <sys/sglist.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/taskqueue.h> 50 #include <sys/smp.h> 51 #include <machine/smp.h> 52 53 #include <vm/uma.h> 54 55 #include <net/debugnet.h> 56 #include <net/ethernet.h> 57 #include <net/pfil.h> 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_arp.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_media.h> 64 #include <net/if_vlan_var.h> 65 66 #include <net/bpf.h> 67 68 #include <netinet/in_systm.h> 69 #include <netinet/in.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip6.h> 72 #include <netinet6/ip6_var.h> 73 #include <netinet/udp.h> 74 #include <netinet/tcp.h> 75 #include <netinet/tcp_lro.h> 76 77 #include <machine/bus.h> 78 #include <machine/resource.h> 79 #include <sys/bus.h> 80 #include <sys/rman.h> 81 82 #include <dev/virtio/virtio.h> 83 #include <dev/virtio/virtqueue.h> 84 #include <dev/virtio/network/virtio_net.h> 85 #include <dev/virtio/network/if_vtnetvar.h> 86 #include "virtio_if.h" 87 88 #include "opt_inet.h" 89 #include "opt_inet6.h" 90 91 #if defined(INET) || defined(INET6) 92 #include <machine/in_cksum.h> 93 #endif 94 95 static int vtnet_modevent(module_t, int, void *); 96 97 static int vtnet_probe(device_t); 98 static int vtnet_attach(device_t); 99 static int vtnet_detach(device_t); 100 static int vtnet_suspend(device_t); 101 static int vtnet_resume(device_t); 102 static int vtnet_shutdown(device_t); 103 static int vtnet_attach_completed(device_t); 104 static int vtnet_config_change(device_t); 105 106 static int vtnet_negotiate_features(struct vtnet_softc *); 107 static int vtnet_setup_features(struct vtnet_softc *); 108 static int vtnet_init_rxq(struct vtnet_softc *, int); 109 static int vtnet_init_txq(struct vtnet_softc *, int); 110 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 111 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 112 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 113 static void vtnet_free_rx_filters(struct vtnet_softc *); 114 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 115 static int vtnet_alloc_interface(struct vtnet_softc *); 116 static int vtnet_setup_interface(struct vtnet_softc *); 117 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 118 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 119 static int vtnet_ioctl_multi(struct vtnet_softc *); 120 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 121 static int vtnet_ioctl(if_t, u_long, caddr_t); 122 static uint64_t vtnet_get_counter(if_t, ift_counter); 123 124 static int vtnet_rxq_populate(struct vtnet_rxq *); 125 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 126 static struct mbuf * 127 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 128 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 129 struct mbuf *, int); 130 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 131 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 132 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 133 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 134 uint16_t, int, struct virtio_net_hdr *); 135 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 136 uint16_t, int, struct virtio_net_hdr *); 137 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 138 struct virtio_net_hdr *); 139 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 140 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 141 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 142 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 143 struct virtio_net_hdr *); 144 static int vtnet_rxq_eof(struct vtnet_rxq *); 145 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 146 static void vtnet_rx_vq_intr(void *); 147 static void vtnet_rxq_tq_intr(void *, int); 148 149 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 150 static int vtnet_txq_below_threshold(struct vtnet_txq *); 151 static int vtnet_txq_notify(struct vtnet_txq *); 152 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 153 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 154 int *, int *, int *); 155 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 156 int, struct virtio_net_hdr *); 157 static struct mbuf * 158 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 159 struct virtio_net_hdr *); 160 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 161 struct vtnet_tx_header *); 162 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 163 #ifdef VTNET_LEGACY_TX 164 static void vtnet_start_locked(struct vtnet_txq *, if_t); 165 static void vtnet_start(if_t); 166 #else 167 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 168 static int vtnet_txq_mq_start(if_t, struct mbuf *); 169 static void vtnet_txq_tq_deferred(void *, int); 170 #endif 171 static void vtnet_txq_start(struct vtnet_txq *); 172 static void vtnet_txq_tq_intr(void *, int); 173 static int vtnet_txq_eof(struct vtnet_txq *); 174 static void vtnet_tx_vq_intr(void *); 175 static void vtnet_tx_start_all(struct vtnet_softc *); 176 177 #ifndef VTNET_LEGACY_TX 178 static void vtnet_qflush(if_t); 179 #endif 180 181 static int vtnet_watchdog(struct vtnet_txq *); 182 static void vtnet_accum_stats(struct vtnet_softc *, 183 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 184 static void vtnet_tick(void *); 185 186 static void vtnet_start_taskqueues(struct vtnet_softc *); 187 static void vtnet_free_taskqueues(struct vtnet_softc *); 188 static void vtnet_drain_taskqueues(struct vtnet_softc *); 189 190 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 191 static void vtnet_stop_rendezvous(struct vtnet_softc *); 192 static void vtnet_stop(struct vtnet_softc *); 193 static int vtnet_virtio_reinit(struct vtnet_softc *); 194 static void vtnet_init_rx_filters(struct vtnet_softc *); 195 static int vtnet_init_rx_queues(struct vtnet_softc *); 196 static int vtnet_init_tx_queues(struct vtnet_softc *); 197 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 198 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 199 static void vtnet_update_rx_offloads(struct vtnet_softc *); 200 static int vtnet_reinit(struct vtnet_softc *); 201 static void vtnet_init_locked(struct vtnet_softc *, int); 202 static void vtnet_init(void *); 203 204 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 205 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 206 struct sglist *, int, int); 207 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 208 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 209 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 210 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 211 static int vtnet_set_promisc(struct vtnet_softc *, bool); 212 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 213 static void vtnet_rx_filter(struct vtnet_softc *); 214 static void vtnet_rx_filter_mac(struct vtnet_softc *); 215 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 216 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 217 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 218 static void vtnet_register_vlan(void *, if_t, uint16_t); 219 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 220 221 static void vtnet_update_speed_duplex(struct vtnet_softc *); 222 static int vtnet_is_link_up(struct vtnet_softc *); 223 static void vtnet_update_link_status(struct vtnet_softc *); 224 static int vtnet_ifmedia_upd(if_t); 225 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 226 static void vtnet_get_macaddr(struct vtnet_softc *); 227 static void vtnet_set_macaddr(struct vtnet_softc *); 228 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 229 static void vtnet_vlan_tag_remove(struct mbuf *); 230 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 231 232 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 233 struct sysctl_oid_list *, struct vtnet_rxq *); 234 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 235 struct sysctl_oid_list *, struct vtnet_txq *); 236 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 237 static void vtnet_load_tunables(struct vtnet_softc *); 238 static void vtnet_setup_sysctl(struct vtnet_softc *); 239 240 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 241 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 242 static int vtnet_txq_enable_intr(struct vtnet_txq *); 243 static void vtnet_txq_disable_intr(struct vtnet_txq *); 244 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 245 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 246 static void vtnet_enable_interrupts(struct vtnet_softc *); 247 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 248 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 249 static void vtnet_disable_interrupts(struct vtnet_softc *); 250 251 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 252 253 DEBUGNET_DEFINE(vtnet); 254 255 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 256 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 257 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 258 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 259 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 260 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 261 262 /* Tunables. */ 263 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 264 "VirtIO Net driver parameters"); 265 266 static int vtnet_csum_disable = 0; 267 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 268 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 269 270 static int vtnet_fixup_needs_csum = 0; 271 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 272 &vtnet_fixup_needs_csum, 0, 273 "Calculate valid checksum for NEEDS_CSUM packets"); 274 275 static int vtnet_tso_disable = 0; 276 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 277 &vtnet_tso_disable, 0, "Disables TSO"); 278 279 static int vtnet_lro_disable = 0; 280 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 281 &vtnet_lro_disable, 0, "Disables hardware LRO"); 282 283 static int vtnet_mq_disable = 0; 284 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 285 &vtnet_mq_disable, 0, "Disables multiqueue support"); 286 287 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 288 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 289 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 290 291 static int vtnet_tso_maxlen = IP_MAXPACKET; 292 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 293 &vtnet_tso_maxlen, 0, "TSO burst limit"); 294 295 static int vtnet_rx_process_limit = 1024; 296 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 297 &vtnet_rx_process_limit, 0, 298 "Number of RX segments processed in one pass"); 299 300 static int vtnet_lro_entry_count = 128; 301 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 302 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 303 304 /* Enable sorted LRO, and the depth of the mbuf queue. */ 305 static int vtnet_lro_mbufq_depth = 0; 306 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 307 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 308 309 static uma_zone_t vtnet_tx_header_zone; 310 311 static struct virtio_feature_desc vtnet_feature_desc[] = { 312 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 313 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 314 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 315 { VIRTIO_NET_F_MAC, "MAC" }, 316 { VIRTIO_NET_F_GSO, "TxGSO" }, 317 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 318 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 319 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 320 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 321 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 322 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 323 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 324 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 325 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 326 { VIRTIO_NET_F_STATUS, "Status" }, 327 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 328 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 329 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 330 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 331 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 332 { VIRTIO_NET_F_MQ, "Multiqueue" }, 333 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 334 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 335 336 { 0, NULL } 337 }; 338 339 static device_method_t vtnet_methods[] = { 340 /* Device methods. */ 341 DEVMETHOD(device_probe, vtnet_probe), 342 DEVMETHOD(device_attach, vtnet_attach), 343 DEVMETHOD(device_detach, vtnet_detach), 344 DEVMETHOD(device_suspend, vtnet_suspend), 345 DEVMETHOD(device_resume, vtnet_resume), 346 DEVMETHOD(device_shutdown, vtnet_shutdown), 347 348 /* VirtIO methods. */ 349 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 350 DEVMETHOD(virtio_config_change, vtnet_config_change), 351 352 DEVMETHOD_END 353 }; 354 355 #ifdef DEV_NETMAP 356 #include <dev/netmap/if_vtnet_netmap.h> 357 #endif 358 359 static driver_t vtnet_driver = { 360 .name = "vtnet", 361 .methods = vtnet_methods, 362 .size = sizeof(struct vtnet_softc) 363 }; 364 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 365 MODULE_VERSION(vtnet, 1); 366 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 367 #ifdef DEV_NETMAP 368 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 369 #endif 370 371 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 372 373 static int 374 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 375 { 376 int error = 0; 377 static int loaded = 0; 378 379 switch (type) { 380 case MOD_LOAD: 381 if (loaded++ == 0) { 382 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 383 sizeof(struct vtnet_tx_header), 384 NULL, NULL, NULL, NULL, 0, 0); 385 #ifdef DEBUGNET 386 /* 387 * We need to allocate from this zone in the transmit path, so ensure 388 * that we have at least one item per header available. 389 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 390 * buckets 391 */ 392 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 393 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 394 #endif 395 } 396 break; 397 case MOD_QUIESCE: 398 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 399 error = EBUSY; 400 break; 401 case MOD_UNLOAD: 402 if (--loaded == 0) { 403 uma_zdestroy(vtnet_tx_header_zone); 404 vtnet_tx_header_zone = NULL; 405 } 406 break; 407 case MOD_SHUTDOWN: 408 break; 409 default: 410 error = EOPNOTSUPP; 411 break; 412 } 413 414 return (error); 415 } 416 417 static int 418 vtnet_probe(device_t dev) 419 { 420 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 421 } 422 423 static int 424 vtnet_attach(device_t dev) 425 { 426 struct vtnet_softc *sc; 427 int error; 428 429 sc = device_get_softc(dev); 430 sc->vtnet_dev = dev; 431 virtio_set_feature_desc(dev, vtnet_feature_desc); 432 433 VTNET_CORE_LOCK_INIT(sc); 434 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 435 vtnet_load_tunables(sc); 436 437 error = vtnet_alloc_interface(sc); 438 if (error) { 439 device_printf(dev, "cannot allocate interface\n"); 440 goto fail; 441 } 442 443 vtnet_setup_sysctl(sc); 444 445 error = vtnet_setup_features(sc); 446 if (error) { 447 device_printf(dev, "cannot setup features\n"); 448 goto fail; 449 } 450 451 error = vtnet_alloc_rx_filters(sc); 452 if (error) { 453 device_printf(dev, "cannot allocate Rx filters\n"); 454 goto fail; 455 } 456 457 error = vtnet_alloc_rxtx_queues(sc); 458 if (error) { 459 device_printf(dev, "cannot allocate queues\n"); 460 goto fail; 461 } 462 463 error = vtnet_alloc_virtqueues(sc); 464 if (error) { 465 device_printf(dev, "cannot allocate virtqueues\n"); 466 goto fail; 467 } 468 469 error = vtnet_setup_interface(sc); 470 if (error) { 471 device_printf(dev, "cannot setup interface\n"); 472 goto fail; 473 } 474 475 error = virtio_setup_intr(dev, INTR_TYPE_NET); 476 if (error) { 477 device_printf(dev, "cannot setup interrupts\n"); 478 ether_ifdetach(sc->vtnet_ifp); 479 goto fail; 480 } 481 482 #ifdef DEV_NETMAP 483 vtnet_netmap_attach(sc); 484 #endif 485 vtnet_start_taskqueues(sc); 486 487 fail: 488 if (error) 489 vtnet_detach(dev); 490 491 return (error); 492 } 493 494 static int 495 vtnet_detach(device_t dev) 496 { 497 struct vtnet_softc *sc; 498 if_t ifp; 499 500 sc = device_get_softc(dev); 501 ifp = sc->vtnet_ifp; 502 503 if (device_is_attached(dev)) { 504 VTNET_CORE_LOCK(sc); 505 vtnet_stop(sc); 506 VTNET_CORE_UNLOCK(sc); 507 508 callout_drain(&sc->vtnet_tick_ch); 509 vtnet_drain_taskqueues(sc); 510 511 ether_ifdetach(ifp); 512 } 513 514 #ifdef DEV_NETMAP 515 netmap_detach(ifp); 516 #endif 517 518 if (sc->vtnet_pfil != NULL) { 519 pfil_head_unregister(sc->vtnet_pfil); 520 sc->vtnet_pfil = NULL; 521 } 522 523 vtnet_free_taskqueues(sc); 524 525 if (sc->vtnet_vlan_attach != NULL) { 526 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 527 sc->vtnet_vlan_attach = NULL; 528 } 529 if (sc->vtnet_vlan_detach != NULL) { 530 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 531 sc->vtnet_vlan_detach = NULL; 532 } 533 534 ifmedia_removeall(&sc->vtnet_media); 535 536 if (ifp != NULL) { 537 if_free(ifp); 538 sc->vtnet_ifp = NULL; 539 } 540 541 vtnet_free_rxtx_queues(sc); 542 vtnet_free_rx_filters(sc); 543 544 if (sc->vtnet_ctrl_vq != NULL) 545 vtnet_free_ctrl_vq(sc); 546 547 VTNET_CORE_LOCK_DESTROY(sc); 548 549 return (0); 550 } 551 552 static int 553 vtnet_suspend(device_t dev) 554 { 555 struct vtnet_softc *sc; 556 557 sc = device_get_softc(dev); 558 559 VTNET_CORE_LOCK(sc); 560 vtnet_stop(sc); 561 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 562 VTNET_CORE_UNLOCK(sc); 563 564 return (0); 565 } 566 567 static int 568 vtnet_resume(device_t dev) 569 { 570 struct vtnet_softc *sc; 571 if_t ifp; 572 573 sc = device_get_softc(dev); 574 ifp = sc->vtnet_ifp; 575 576 VTNET_CORE_LOCK(sc); 577 if (if_getflags(ifp) & IFF_UP) 578 vtnet_init_locked(sc, 0); 579 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 580 VTNET_CORE_UNLOCK(sc); 581 582 return (0); 583 } 584 585 static int 586 vtnet_shutdown(device_t dev) 587 { 588 /* 589 * Suspend already does all of what we need to 590 * do here; we just never expect to be resumed. 591 */ 592 return (vtnet_suspend(dev)); 593 } 594 595 static int 596 vtnet_attach_completed(device_t dev) 597 { 598 struct vtnet_softc *sc; 599 600 sc = device_get_softc(dev); 601 602 VTNET_CORE_LOCK(sc); 603 vtnet_attached_set_macaddr(sc); 604 VTNET_CORE_UNLOCK(sc); 605 606 return (0); 607 } 608 609 static int 610 vtnet_config_change(device_t dev) 611 { 612 struct vtnet_softc *sc; 613 614 sc = device_get_softc(dev); 615 616 VTNET_CORE_LOCK(sc); 617 vtnet_update_link_status(sc); 618 if (sc->vtnet_link_active != 0) 619 vtnet_tx_start_all(sc); 620 VTNET_CORE_UNLOCK(sc); 621 622 return (0); 623 } 624 625 static int 626 vtnet_negotiate_features(struct vtnet_softc *sc) 627 { 628 device_t dev; 629 uint64_t features, negotiated_features; 630 int no_csum; 631 632 dev = sc->vtnet_dev; 633 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 634 VTNET_LEGACY_FEATURES; 635 636 /* 637 * TSO and LRO are only available when their corresponding checksum 638 * offload feature is also negotiated. 639 */ 640 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 641 if (no_csum) 642 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 643 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 644 features &= ~VTNET_TSO_FEATURES; 645 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 646 features &= ~VTNET_LRO_FEATURES; 647 648 #ifndef VTNET_LEGACY_TX 649 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 650 features &= ~VIRTIO_NET_F_MQ; 651 #else 652 features &= ~VIRTIO_NET_F_MQ; 653 #endif 654 655 negotiated_features = virtio_negotiate_features(dev, features); 656 657 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 658 uint16_t mtu; 659 660 mtu = virtio_read_dev_config_2(dev, 661 offsetof(struct virtio_net_config, mtu)); 662 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 663 device_printf(dev, "Invalid MTU value: %d. " 664 "MTU feature disabled.\n", mtu); 665 features &= ~VIRTIO_NET_F_MTU; 666 negotiated_features = 667 virtio_negotiate_features(dev, features); 668 } 669 } 670 671 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 672 uint16_t npairs; 673 674 npairs = virtio_read_dev_config_2(dev, 675 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 676 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 677 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 678 device_printf(dev, "Invalid max_virtqueue_pairs value: " 679 "%d. Multiqueue feature disabled.\n", npairs); 680 features &= ~VIRTIO_NET_F_MQ; 681 negotiated_features = 682 virtio_negotiate_features(dev, features); 683 } 684 } 685 686 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 687 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 688 /* 689 * LRO without mergeable buffers requires special care. This 690 * is not ideal because every receive buffer must be large 691 * enough to hold the maximum TCP packet, the Ethernet header, 692 * and the header. This requires up to 34 descriptors with 693 * MCLBYTES clusters. If we do not have indirect descriptors, 694 * LRO is disabled since the virtqueue will not contain very 695 * many receive buffers. 696 */ 697 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 698 device_printf(dev, 699 "Host LRO disabled since both mergeable buffers " 700 "and indirect descriptors were not negotiated\n"); 701 features &= ~VTNET_LRO_FEATURES; 702 negotiated_features = 703 virtio_negotiate_features(dev, features); 704 } else 705 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 706 } 707 708 sc->vtnet_features = negotiated_features; 709 sc->vtnet_negotiated_features = negotiated_features; 710 711 return (virtio_finalize_features(dev)); 712 } 713 714 static int 715 vtnet_setup_features(struct vtnet_softc *sc) 716 { 717 device_t dev; 718 int error; 719 720 dev = sc->vtnet_dev; 721 722 error = vtnet_negotiate_features(sc); 723 if (error) 724 return (error); 725 726 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 727 sc->vtnet_flags |= VTNET_FLAG_MODERN; 728 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 729 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 730 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 731 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 732 733 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 734 /* This feature should always be negotiated. */ 735 sc->vtnet_flags |= VTNET_FLAG_MAC; 736 } 737 738 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 739 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 740 offsetof(struct virtio_net_config, mtu)); 741 } else 742 sc->vtnet_max_mtu = VTNET_MAX_MTU; 743 744 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 745 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 746 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 747 } else if (vtnet_modern(sc)) { 748 /* This is identical to the mergeable header. */ 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 750 } else 751 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 752 753 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 754 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 755 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 756 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 757 else 758 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 759 760 /* 761 * Favor "hardware" LRO if negotiated, but support software LRO as 762 * a fallback; there is usually little benefit (or worse) with both. 763 */ 764 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 765 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 766 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 767 768 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 769 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 770 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 771 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 772 else 773 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 774 775 sc->vtnet_req_vq_pairs = 1; 776 sc->vtnet_max_vq_pairs = 1; 777 778 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 779 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 780 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 782 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 783 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 784 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 785 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 786 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 787 788 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 789 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 790 offsetof(struct virtio_net_config, 791 max_virtqueue_pairs)); 792 } 793 } 794 795 if (sc->vtnet_max_vq_pairs > 1) { 796 int req; 797 798 /* 799 * Limit the maximum number of requested queue pairs to the 800 * number of CPUs and the configured maximum. 801 */ 802 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 803 if (req < 0) 804 req = 1; 805 if (req == 0) 806 req = mp_ncpus; 807 if (req > sc->vtnet_max_vq_pairs) 808 req = sc->vtnet_max_vq_pairs; 809 if (req > mp_ncpus) 810 req = mp_ncpus; 811 if (req > 1) { 812 sc->vtnet_req_vq_pairs = req; 813 sc->vtnet_flags |= VTNET_FLAG_MQ; 814 } 815 } 816 817 return (0); 818 } 819 820 static int 821 vtnet_init_rxq(struct vtnet_softc *sc, int id) 822 { 823 struct vtnet_rxq *rxq; 824 825 rxq = &sc->vtnet_rxqs[id]; 826 827 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 828 device_get_nameunit(sc->vtnet_dev), id); 829 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 830 831 rxq->vtnrx_sc = sc; 832 rxq->vtnrx_id = id; 833 834 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 835 if (rxq->vtnrx_sg == NULL) 836 return (ENOMEM); 837 838 #if defined(INET) || defined(INET6) 839 if (vtnet_software_lro(sc)) { 840 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 841 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 842 return (ENOMEM); 843 } 844 #endif 845 846 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 847 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 848 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 849 850 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 851 } 852 853 static int 854 vtnet_init_txq(struct vtnet_softc *sc, int id) 855 { 856 struct vtnet_txq *txq; 857 858 txq = &sc->vtnet_txqs[id]; 859 860 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 861 device_get_nameunit(sc->vtnet_dev), id); 862 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 863 864 txq->vtntx_sc = sc; 865 txq->vtntx_id = id; 866 867 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 868 if (txq->vtntx_sg == NULL) 869 return (ENOMEM); 870 871 #ifndef VTNET_LEGACY_TX 872 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 873 M_NOWAIT, &txq->vtntx_mtx); 874 if (txq->vtntx_br == NULL) 875 return (ENOMEM); 876 877 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 878 #endif 879 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 880 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 881 taskqueue_thread_enqueue, &txq->vtntx_tq); 882 if (txq->vtntx_tq == NULL) 883 return (ENOMEM); 884 885 return (0); 886 } 887 888 static int 889 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 890 { 891 int i, npairs, error; 892 893 npairs = sc->vtnet_max_vq_pairs; 894 895 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 896 M_NOWAIT | M_ZERO); 897 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 898 M_NOWAIT | M_ZERO); 899 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 900 return (ENOMEM); 901 902 for (i = 0; i < npairs; i++) { 903 error = vtnet_init_rxq(sc, i); 904 if (error) 905 return (error); 906 error = vtnet_init_txq(sc, i); 907 if (error) 908 return (error); 909 } 910 911 vtnet_set_rx_process_limit(sc); 912 vtnet_setup_queue_sysctl(sc); 913 914 return (0); 915 } 916 917 static void 918 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 919 { 920 921 rxq->vtnrx_sc = NULL; 922 rxq->vtnrx_id = -1; 923 924 #if defined(INET) || defined(INET6) 925 tcp_lro_free(&rxq->vtnrx_lro); 926 #endif 927 928 if (rxq->vtnrx_sg != NULL) { 929 sglist_free(rxq->vtnrx_sg); 930 rxq->vtnrx_sg = NULL; 931 } 932 933 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 934 mtx_destroy(&rxq->vtnrx_mtx); 935 } 936 937 static void 938 vtnet_destroy_txq(struct vtnet_txq *txq) 939 { 940 941 txq->vtntx_sc = NULL; 942 txq->vtntx_id = -1; 943 944 if (txq->vtntx_sg != NULL) { 945 sglist_free(txq->vtntx_sg); 946 txq->vtntx_sg = NULL; 947 } 948 949 #ifndef VTNET_LEGACY_TX 950 if (txq->vtntx_br != NULL) { 951 buf_ring_free(txq->vtntx_br, M_DEVBUF); 952 txq->vtntx_br = NULL; 953 } 954 #endif 955 956 if (mtx_initialized(&txq->vtntx_mtx) != 0) 957 mtx_destroy(&txq->vtntx_mtx); 958 } 959 960 static void 961 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 962 { 963 int i; 964 965 if (sc->vtnet_rxqs != NULL) { 966 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 967 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 968 free(sc->vtnet_rxqs, M_DEVBUF); 969 sc->vtnet_rxqs = NULL; 970 } 971 972 if (sc->vtnet_txqs != NULL) { 973 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 974 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 975 free(sc->vtnet_txqs, M_DEVBUF); 976 sc->vtnet_txqs = NULL; 977 } 978 } 979 980 static int 981 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 982 { 983 984 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 985 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 986 M_DEVBUF, M_NOWAIT | M_ZERO); 987 if (sc->vtnet_mac_filter == NULL) 988 return (ENOMEM); 989 } 990 991 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 992 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 993 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 994 if (sc->vtnet_vlan_filter == NULL) 995 return (ENOMEM); 996 } 997 998 return (0); 999 } 1000 1001 static void 1002 vtnet_free_rx_filters(struct vtnet_softc *sc) 1003 { 1004 1005 if (sc->vtnet_mac_filter != NULL) { 1006 free(sc->vtnet_mac_filter, M_DEVBUF); 1007 sc->vtnet_mac_filter = NULL; 1008 } 1009 1010 if (sc->vtnet_vlan_filter != NULL) { 1011 free(sc->vtnet_vlan_filter, M_DEVBUF); 1012 sc->vtnet_vlan_filter = NULL; 1013 } 1014 } 1015 1016 static int 1017 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1018 { 1019 device_t dev; 1020 struct vq_alloc_info *info; 1021 struct vtnet_rxq *rxq; 1022 struct vtnet_txq *txq; 1023 int i, idx, flags, nvqs, error; 1024 1025 dev = sc->vtnet_dev; 1026 flags = 0; 1027 1028 nvqs = sc->vtnet_max_vq_pairs * 2; 1029 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1030 nvqs++; 1031 1032 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1033 if (info == NULL) 1034 return (ENOMEM); 1035 1036 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1037 rxq = &sc->vtnet_rxqs[i]; 1038 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1039 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1040 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1041 1042 txq = &sc->vtnet_txqs[i]; 1043 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1044 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1045 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1046 } 1047 1048 /* These queues will not be used so allocate the minimum resources. */ 1049 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1050 rxq = &sc->vtnet_rxqs[i]; 1051 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1052 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1053 1054 txq = &sc->vtnet_txqs[i]; 1055 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1056 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1057 } 1058 1059 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1060 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1061 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1062 } 1063 1064 /* 1065 * TODO: Enable interrupt binding if this is multiqueue. This will 1066 * only matter when per-virtqueue MSIX is available. 1067 */ 1068 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1069 flags |= 0; 1070 1071 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1072 free(info, M_TEMP); 1073 1074 return (error); 1075 } 1076 1077 static int 1078 vtnet_alloc_interface(struct vtnet_softc *sc) 1079 { 1080 device_t dev; 1081 if_t ifp; 1082 1083 dev = sc->vtnet_dev; 1084 1085 ifp = if_alloc(IFT_ETHER); 1086 if (ifp == NULL) 1087 return (ENOMEM); 1088 1089 sc->vtnet_ifp = ifp; 1090 if_setsoftc(ifp, sc); 1091 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1092 1093 return (0); 1094 } 1095 1096 static int 1097 vtnet_setup_interface(struct vtnet_softc *sc) 1098 { 1099 device_t dev; 1100 struct pfil_head_args pa; 1101 if_t ifp; 1102 1103 dev = sc->vtnet_dev; 1104 ifp = sc->vtnet_ifp; 1105 1106 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST | 1107 IFF_KNOWSEPOCH); 1108 if_setbaudrate(ifp, IF_Gbps(10)); 1109 if_setinitfn(ifp, vtnet_init); 1110 if_setioctlfn(ifp, vtnet_ioctl); 1111 if_setgetcounterfn(ifp, vtnet_get_counter); 1112 #ifndef VTNET_LEGACY_TX 1113 if_settransmitfn(ifp, vtnet_txq_mq_start); 1114 if_setqflushfn(ifp, vtnet_qflush); 1115 #else 1116 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1117 if_setstartfn(ifp, vtnet_start); 1118 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1119 if_setsendqready(ifp); 1120 #endif 1121 1122 vtnet_get_macaddr(sc); 1123 1124 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1125 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1126 1127 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1128 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1129 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1130 1131 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1132 int gso; 1133 1134 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1135 1136 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1137 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1138 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1139 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1140 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1141 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1142 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1143 1144 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1145 int tso_maxlen; 1146 1147 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1148 1149 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1150 vtnet_tso_maxlen); 1151 if_sethwtsomax(ifp, tso_maxlen - 1152 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1153 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1154 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1155 } 1156 } 1157 1158 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1159 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1160 #ifdef notyet 1161 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1162 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1163 #endif 1164 1165 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1166 vtnet_fixup_needs_csum) != 0) 1167 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1168 1169 /* Support either "hardware" or software LRO. */ 1170 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1171 } 1172 1173 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1174 /* 1175 * VirtIO does not support VLAN tagging, but we can fake 1176 * it by inserting and removing the 802.1Q header during 1177 * transmit and receive. We are then able to do checksum 1178 * offloading of VLAN frames. 1179 */ 1180 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1181 } 1182 1183 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1184 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1185 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1186 1187 /* 1188 * Capabilities after here are not enabled by default. 1189 */ 1190 if_setcapenable(ifp, if_getcapabilities(ifp)); 1191 1192 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1193 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1194 1195 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1196 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1197 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1198 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1199 } 1200 1201 ether_ifattach(ifp, sc->vtnet_hwaddr); 1202 1203 /* Tell the upper layer(s) we support long frames. */ 1204 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1205 1206 DEBUGNET_SET(ifp, vtnet); 1207 1208 pa.pa_version = PFIL_VERSION; 1209 pa.pa_flags = PFIL_IN; 1210 pa.pa_type = PFIL_TYPE_ETHERNET; 1211 pa.pa_headname = if_name(ifp); 1212 sc->vtnet_pfil = pfil_head_register(&pa); 1213 1214 return (0); 1215 } 1216 1217 static int 1218 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1219 { 1220 int framesz; 1221 1222 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1223 return (MJUMPAGESIZE); 1224 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1225 return (MCLBYTES); 1226 1227 /* 1228 * Try to scale the receive mbuf cluster size from the MTU. We 1229 * could also use the VQ size to influence the selected size, 1230 * but that would only matter for very small queues. 1231 */ 1232 if (vtnet_modern(sc)) { 1233 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1234 framesz = sizeof(struct virtio_net_hdr_v1); 1235 } else 1236 framesz = sizeof(struct vtnet_rx_header); 1237 framesz += sizeof(struct ether_vlan_header) + mtu; 1238 1239 if (framesz <= MCLBYTES) 1240 return (MCLBYTES); 1241 else if (framesz <= MJUMPAGESIZE) 1242 return (MJUMPAGESIZE); 1243 else if (framesz <= MJUM9BYTES) 1244 return (MJUM9BYTES); 1245 1246 /* Sane default; avoid 16KB clusters. */ 1247 return (MCLBYTES); 1248 } 1249 1250 static int 1251 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1252 { 1253 if_t ifp; 1254 int clustersz; 1255 1256 ifp = sc->vtnet_ifp; 1257 VTNET_CORE_LOCK_ASSERT(sc); 1258 1259 if (if_getmtu(ifp) == mtu) 1260 return (0); 1261 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1262 return (EINVAL); 1263 1264 if_setmtu(ifp, mtu); 1265 clustersz = vtnet_rx_cluster_size(sc, mtu); 1266 1267 if (clustersz != sc->vtnet_rx_clustersz && 1268 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1269 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1270 vtnet_init_locked(sc, 0); 1271 } 1272 1273 return (0); 1274 } 1275 1276 static int 1277 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1278 { 1279 if_t ifp; 1280 int drv_running; 1281 1282 ifp = sc->vtnet_ifp; 1283 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1284 1285 VTNET_CORE_LOCK_ASSERT(sc); 1286 1287 if ((if_getflags(ifp) & IFF_UP) == 0) { 1288 if (drv_running) 1289 vtnet_stop(sc); 1290 goto out; 1291 } 1292 1293 if (!drv_running) { 1294 vtnet_init_locked(sc, 0); 1295 goto out; 1296 } 1297 1298 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1299 (IFF_PROMISC | IFF_ALLMULTI)) { 1300 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1301 vtnet_rx_filter(sc); 1302 else { 1303 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & IFF_ALLMULTI) 1304 return (ENOTSUP); 1305 if_setflagbits(ifp, IFF_PROMISC, 0); 1306 } 1307 } 1308 1309 out: 1310 sc->vtnet_if_flags = if_getflags(ifp); 1311 return (0); 1312 } 1313 1314 static int 1315 vtnet_ioctl_multi(struct vtnet_softc *sc) 1316 { 1317 if_t ifp; 1318 1319 ifp = sc->vtnet_ifp; 1320 1321 VTNET_CORE_LOCK_ASSERT(sc); 1322 1323 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1324 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1325 vtnet_rx_filter_mac(sc); 1326 1327 return (0); 1328 } 1329 1330 static int 1331 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1332 { 1333 if_t ifp; 1334 int mask, reinit, update; 1335 1336 ifp = sc->vtnet_ifp; 1337 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1338 reinit = update = 0; 1339 1340 VTNET_CORE_LOCK_ASSERT(sc); 1341 1342 if (mask & IFCAP_TXCSUM) 1343 if_togglecapenable(ifp, IFCAP_TXCSUM); 1344 if (mask & IFCAP_TXCSUM_IPV6) 1345 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1346 if (mask & IFCAP_TSO4) 1347 if_togglecapenable(ifp, IFCAP_TSO4); 1348 if (mask & IFCAP_TSO6) 1349 if_togglecapenable(ifp, IFCAP_TSO6); 1350 1351 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1352 /* 1353 * These Rx features require the negotiated features to 1354 * be updated. Avoid a full reinit if possible. 1355 */ 1356 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1357 update = 1; 1358 else 1359 reinit = 1; 1360 1361 /* BMV: Avoid needless renegotiation for just software LRO. */ 1362 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1363 IFCAP_LRO && vtnet_software_lro(sc)) 1364 reinit = update = 0; 1365 1366 if (mask & IFCAP_RXCSUM) 1367 if_togglecapenable(ifp, IFCAP_RXCSUM); 1368 if (mask & IFCAP_RXCSUM_IPV6) 1369 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1370 if (mask & IFCAP_LRO) 1371 if_togglecapenable(ifp, IFCAP_LRO); 1372 1373 /* 1374 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1375 * so treat them as a pair. Guest TSO (LRO) requires receive 1376 * checksums. 1377 */ 1378 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1379 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1380 #ifdef notyet 1381 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1382 #endif 1383 } else 1384 if_setcapenablebit(ifp, 0, 1385 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1386 } 1387 1388 if (mask & IFCAP_VLAN_HWFILTER) { 1389 /* These Rx features require renegotiation. */ 1390 reinit = 1; 1391 1392 if (mask & IFCAP_VLAN_HWFILTER) 1393 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1394 } 1395 1396 if (mask & IFCAP_VLAN_HWTSO) 1397 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1398 if (mask & IFCAP_VLAN_HWTAGGING) 1399 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1400 1401 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1402 if (reinit) { 1403 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1404 vtnet_init_locked(sc, 0); 1405 } else if (update) 1406 vtnet_update_rx_offloads(sc); 1407 } 1408 1409 return (0); 1410 } 1411 1412 static int 1413 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1414 { 1415 struct vtnet_softc *sc; 1416 struct ifreq *ifr; 1417 int error; 1418 1419 sc = if_getsoftc(ifp); 1420 ifr = (struct ifreq *) data; 1421 error = 0; 1422 1423 switch (cmd) { 1424 case SIOCSIFMTU: 1425 VTNET_CORE_LOCK(sc); 1426 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1427 VTNET_CORE_UNLOCK(sc); 1428 break; 1429 1430 case SIOCSIFFLAGS: 1431 VTNET_CORE_LOCK(sc); 1432 error = vtnet_ioctl_ifflags(sc); 1433 VTNET_CORE_UNLOCK(sc); 1434 break; 1435 1436 case SIOCADDMULTI: 1437 case SIOCDELMULTI: 1438 VTNET_CORE_LOCK(sc); 1439 error = vtnet_ioctl_multi(sc); 1440 VTNET_CORE_UNLOCK(sc); 1441 break; 1442 1443 case SIOCSIFMEDIA: 1444 case SIOCGIFMEDIA: 1445 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1446 break; 1447 1448 case SIOCSIFCAP: 1449 VTNET_CORE_LOCK(sc); 1450 error = vtnet_ioctl_ifcap(sc, ifr); 1451 VTNET_CORE_UNLOCK(sc); 1452 VLAN_CAPABILITIES(ifp); 1453 break; 1454 1455 default: 1456 error = ether_ioctl(ifp, cmd, data); 1457 break; 1458 } 1459 1460 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1461 1462 return (error); 1463 } 1464 1465 static int 1466 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1467 { 1468 struct virtqueue *vq; 1469 int nbufs, error; 1470 1471 #ifdef DEV_NETMAP 1472 error = vtnet_netmap_rxq_populate(rxq); 1473 if (error >= 0) 1474 return (error); 1475 #endif /* DEV_NETMAP */ 1476 1477 vq = rxq->vtnrx_vq; 1478 error = ENOSPC; 1479 1480 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1481 error = vtnet_rxq_new_buf(rxq); 1482 if (error) 1483 break; 1484 } 1485 1486 if (nbufs > 0) { 1487 virtqueue_notify(vq); 1488 /* 1489 * EMSGSIZE signifies the virtqueue did not have enough 1490 * entries available to hold the last mbuf. This is not 1491 * an error. 1492 */ 1493 if (error == EMSGSIZE) 1494 error = 0; 1495 } 1496 1497 return (error); 1498 } 1499 1500 static void 1501 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1502 { 1503 struct virtqueue *vq; 1504 struct mbuf *m; 1505 int last; 1506 #ifdef DEV_NETMAP 1507 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1508 rxq->vtnrx_id, NR_RX); 1509 #else /* !DEV_NETMAP */ 1510 void *kring = NULL; 1511 #endif /* !DEV_NETMAP */ 1512 1513 vq = rxq->vtnrx_vq; 1514 last = 0; 1515 1516 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1517 if (kring == NULL) 1518 m_freem(m); 1519 } 1520 1521 KASSERT(virtqueue_empty(vq), 1522 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1523 } 1524 1525 static struct mbuf * 1526 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1527 { 1528 struct mbuf *m_head, *m_tail, *m; 1529 int i, size; 1530 1531 m_head = NULL; 1532 size = sc->vtnet_rx_clustersz; 1533 1534 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1535 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1536 1537 for (i = 0; i < nbufs; i++) { 1538 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1539 if (m == NULL) { 1540 sc->vtnet_stats.mbuf_alloc_failed++; 1541 m_freem(m_head); 1542 return (NULL); 1543 } 1544 1545 m->m_len = size; 1546 if (m_head != NULL) { 1547 m_tail->m_next = m; 1548 m_tail = m; 1549 } else 1550 m_head = m_tail = m; 1551 } 1552 1553 if (m_tailp != NULL) 1554 *m_tailp = m_tail; 1555 1556 return (m_head); 1557 } 1558 1559 /* 1560 * Slow path for when LRO without mergeable buffers is negotiated. 1561 */ 1562 static int 1563 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1564 int len0) 1565 { 1566 struct vtnet_softc *sc; 1567 struct mbuf *m, *m_prev, *m_new, *m_tail; 1568 int len, clustersz, nreplace, error; 1569 1570 sc = rxq->vtnrx_sc; 1571 clustersz = sc->vtnet_rx_clustersz; 1572 1573 m_prev = NULL; 1574 m_tail = NULL; 1575 nreplace = 0; 1576 1577 m = m0; 1578 len = len0; 1579 1580 /* 1581 * Since these mbuf chains are so large, avoid allocating a complete 1582 * replacement when the received frame did not consume the entire 1583 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1584 */ 1585 while (len > 0) { 1586 if (m == NULL) { 1587 sc->vtnet_stats.rx_frame_too_large++; 1588 return (EMSGSIZE); 1589 } 1590 1591 /* 1592 * Every mbuf should have the expected cluster size since that 1593 * is also used to allocate the replacements. 1594 */ 1595 KASSERT(m->m_len == clustersz, 1596 ("%s: mbuf size %d not expected cluster size %d", __func__, 1597 m->m_len, clustersz)); 1598 1599 m->m_len = MIN(m->m_len, len); 1600 len -= m->m_len; 1601 1602 m_prev = m; 1603 m = m->m_next; 1604 nreplace++; 1605 } 1606 1607 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1608 ("%s: invalid replacement mbuf count %d max %d", __func__, 1609 nreplace, sc->vtnet_rx_nmbufs)); 1610 1611 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1612 if (m_new == NULL) { 1613 m_prev->m_len = clustersz; 1614 return (ENOBUFS); 1615 } 1616 1617 /* 1618 * Move any unused mbufs from the received mbuf chain onto the 1619 * end of the replacement chain. 1620 */ 1621 if (m_prev->m_next != NULL) { 1622 m_tail->m_next = m_prev->m_next; 1623 m_prev->m_next = NULL; 1624 } 1625 1626 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1627 if (error) { 1628 /* 1629 * The replacement is suppose to be an copy of the one 1630 * dequeued so this is a very unexpected error. 1631 * 1632 * Restore the m0 chain to the original state if it was 1633 * modified so we can then discard it. 1634 */ 1635 if (m_tail->m_next != NULL) { 1636 m_prev->m_next = m_tail->m_next; 1637 m_tail->m_next = NULL; 1638 } 1639 m_prev->m_len = clustersz; 1640 sc->vtnet_stats.rx_enq_replacement_failed++; 1641 m_freem(m_new); 1642 } 1643 1644 return (error); 1645 } 1646 1647 static int 1648 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1649 { 1650 struct vtnet_softc *sc; 1651 struct mbuf *m_new; 1652 int error; 1653 1654 sc = rxq->vtnrx_sc; 1655 1656 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1657 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1658 1659 MPASS(m->m_next == NULL); 1660 if (m->m_len < len) 1661 return (EMSGSIZE); 1662 1663 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1664 if (m_new == NULL) 1665 return (ENOBUFS); 1666 1667 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1668 if (error) { 1669 sc->vtnet_stats.rx_enq_replacement_failed++; 1670 m_freem(m_new); 1671 } else 1672 m->m_len = len; 1673 1674 return (error); 1675 } 1676 1677 static int 1678 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1679 { 1680 struct vtnet_softc *sc; 1681 struct sglist *sg; 1682 int header_inlined, error; 1683 1684 sc = rxq->vtnrx_sc; 1685 sg = rxq->vtnrx_sg; 1686 1687 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1688 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1689 VTNET_RXQ_LOCK_ASSERT(rxq); 1690 1691 sglist_reset(sg); 1692 header_inlined = vtnet_modern(sc) || 1693 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1694 1695 if (header_inlined) 1696 error = sglist_append_mbuf(sg, m); 1697 else { 1698 struct vtnet_rx_header *rxhdr = 1699 mtod(m, struct vtnet_rx_header *); 1700 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1701 1702 /* Append the header and remaining mbuf data. */ 1703 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1704 if (error) 1705 return (error); 1706 error = sglist_append(sg, &rxhdr[1], 1707 m->m_len - sizeof(struct vtnet_rx_header)); 1708 if (error) 1709 return (error); 1710 1711 if (m->m_next != NULL) 1712 error = sglist_append_mbuf(sg, m->m_next); 1713 } 1714 1715 if (error) 1716 return (error); 1717 1718 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1719 } 1720 1721 static int 1722 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1723 { 1724 struct vtnet_softc *sc; 1725 struct mbuf *m; 1726 int error; 1727 1728 sc = rxq->vtnrx_sc; 1729 1730 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1731 if (m == NULL) 1732 return (ENOBUFS); 1733 1734 error = vtnet_rxq_enqueue_buf(rxq, m); 1735 if (error) 1736 m_freem(m); 1737 1738 return (error); 1739 } 1740 1741 static int 1742 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1743 int hoff, struct virtio_net_hdr *hdr) 1744 { 1745 struct vtnet_softc *sc; 1746 int error; 1747 1748 sc = rxq->vtnrx_sc; 1749 1750 /* 1751 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1752 * not have an analogous CSUM flag. The checksum has been validated, 1753 * but is incomplete (TCP/UDP pseudo header). 1754 * 1755 * The packet is likely from another VM on the same host that itself 1756 * performed checksum offloading so Tx/Rx is basically a memcpy and 1757 * the checksum has little value. 1758 * 1759 * Default to receiving the packet as-is for performance reasons, but 1760 * this can cause issues if the packet is to be forwarded because it 1761 * does not contain a valid checksum. This patch may be helpful: 1762 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1763 * compute the checksum if requested. 1764 * 1765 * BMV: Need to add an CSUM_PARTIAL flag? 1766 */ 1767 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1768 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1769 return (error); 1770 } 1771 1772 /* 1773 * Compute the checksum in the driver so the packet will contain a 1774 * valid checksum. The checksum is at csum_offset from csum_start. 1775 */ 1776 switch (etype) { 1777 #if defined(INET) || defined(INET6) 1778 case ETHERTYPE_IP: 1779 case ETHERTYPE_IPV6: { 1780 int csum_off, csum_end; 1781 uint16_t csum; 1782 1783 csum_off = hdr->csum_start + hdr->csum_offset; 1784 csum_end = csum_off + sizeof(uint16_t); 1785 1786 /* Assume checksum will be in the first mbuf. */ 1787 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1788 return (1); 1789 1790 /* 1791 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1792 * checksum and write it at the specified offset. We could 1793 * try to verify the packet: csum_start should probably 1794 * correspond to the start of the TCP/UDP header. 1795 * 1796 * BMV: Need to properly handle UDP with zero checksum. Is 1797 * the IPv4 header checksum implicitly validated? 1798 */ 1799 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1800 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1801 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1802 m->m_pkthdr.csum_data = 0xFFFF; 1803 break; 1804 } 1805 #endif 1806 default: 1807 sc->vtnet_stats.rx_csum_bad_ethtype++; 1808 return (1); 1809 } 1810 1811 return (0); 1812 } 1813 1814 static int 1815 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1816 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1817 { 1818 #if 0 1819 struct vtnet_softc *sc; 1820 #endif 1821 int protocol; 1822 1823 #if 0 1824 sc = rxq->vtnrx_sc; 1825 #endif 1826 1827 switch (etype) { 1828 #if defined(INET) 1829 case ETHERTYPE_IP: 1830 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1831 protocol = IPPROTO_DONE; 1832 else { 1833 struct ip *ip = (struct ip *)(m->m_data + hoff); 1834 protocol = ip->ip_p; 1835 } 1836 break; 1837 #endif 1838 #if defined(INET6) 1839 case ETHERTYPE_IPV6: 1840 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1841 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1842 protocol = IPPROTO_DONE; 1843 break; 1844 #endif 1845 default: 1846 protocol = IPPROTO_DONE; 1847 break; 1848 } 1849 1850 switch (protocol) { 1851 case IPPROTO_TCP: 1852 case IPPROTO_UDP: 1853 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1854 m->m_pkthdr.csum_data = 0xFFFF; 1855 break; 1856 default: 1857 /* 1858 * FreeBSD does not support checksum offloading of this 1859 * protocol. Let the stack re-verify the checksum later 1860 * if the protocol is supported. 1861 */ 1862 #if 0 1863 if_printf(sc->vtnet_ifp, 1864 "%s: checksum offload of unsupported protocol " 1865 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1866 __func__, etype, protocol, hdr->csum_start, 1867 hdr->csum_offset); 1868 #endif 1869 break; 1870 } 1871 1872 return (0); 1873 } 1874 1875 static int 1876 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1877 struct virtio_net_hdr *hdr) 1878 { 1879 const struct ether_header *eh; 1880 int hoff; 1881 uint16_t etype; 1882 1883 eh = mtod(m, const struct ether_header *); 1884 etype = ntohs(eh->ether_type); 1885 if (etype == ETHERTYPE_VLAN) { 1886 /* TODO BMV: Handle QinQ. */ 1887 const struct ether_vlan_header *evh = 1888 mtod(m, const struct ether_vlan_header *); 1889 etype = ntohs(evh->evl_proto); 1890 hoff = sizeof(struct ether_vlan_header); 1891 } else 1892 hoff = sizeof(struct ether_header); 1893 1894 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1895 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1896 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1897 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1898 } 1899 1900 static void 1901 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1902 { 1903 struct mbuf *m; 1904 1905 while (--nbufs > 0) { 1906 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1907 if (m == NULL) 1908 break; 1909 vtnet_rxq_discard_buf(rxq, m); 1910 } 1911 } 1912 1913 static void 1914 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1915 { 1916 int error __diagused; 1917 1918 /* 1919 * Requeue the discarded mbuf. This should always be successful 1920 * since it was just dequeued. 1921 */ 1922 error = vtnet_rxq_enqueue_buf(rxq, m); 1923 KASSERT(error == 0, 1924 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1925 } 1926 1927 static int 1928 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1929 { 1930 struct vtnet_softc *sc; 1931 struct virtqueue *vq; 1932 struct mbuf *m_tail; 1933 1934 sc = rxq->vtnrx_sc; 1935 vq = rxq->vtnrx_vq; 1936 m_tail = m_head; 1937 1938 while (--nbufs > 0) { 1939 struct mbuf *m; 1940 uint32_t len; 1941 1942 m = virtqueue_dequeue(vq, &len); 1943 if (m == NULL) { 1944 rxq->vtnrx_stats.vrxs_ierrors++; 1945 goto fail; 1946 } 1947 1948 if (vtnet_rxq_new_buf(rxq) != 0) { 1949 rxq->vtnrx_stats.vrxs_iqdrops++; 1950 vtnet_rxq_discard_buf(rxq, m); 1951 if (nbufs > 1) 1952 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1953 goto fail; 1954 } 1955 1956 if (m->m_len < len) 1957 len = m->m_len; 1958 1959 m->m_len = len; 1960 m->m_flags &= ~M_PKTHDR; 1961 1962 m_head->m_pkthdr.len += len; 1963 m_tail->m_next = m; 1964 m_tail = m; 1965 } 1966 1967 return (0); 1968 1969 fail: 1970 sc->vtnet_stats.rx_mergeable_failed++; 1971 m_freem(m_head); 1972 1973 return (1); 1974 } 1975 1976 #if defined(INET) || defined(INET6) 1977 static int 1978 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 1979 { 1980 struct lro_ctrl *lro; 1981 1982 lro = &rxq->vtnrx_lro; 1983 1984 if (lro->lro_mbuf_max != 0) { 1985 tcp_lro_queue_mbuf(lro, m); 1986 return (0); 1987 } 1988 1989 return (tcp_lro_rx(lro, m, 0)); 1990 } 1991 #endif 1992 1993 static void 1994 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 1995 struct virtio_net_hdr *hdr) 1996 { 1997 struct vtnet_softc *sc; 1998 if_t ifp; 1999 2000 sc = rxq->vtnrx_sc; 2001 ifp = sc->vtnet_ifp; 2002 2003 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2004 struct ether_header *eh = mtod(m, struct ether_header *); 2005 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2006 vtnet_vlan_tag_remove(m); 2007 /* 2008 * With the 802.1Q header removed, update the 2009 * checksum starting location accordingly. 2010 */ 2011 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2012 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2013 } 2014 } 2015 2016 m->m_pkthdr.flowid = rxq->vtnrx_id; 2017 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2018 2019 if (hdr->flags & 2020 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2021 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2022 rxq->vtnrx_stats.vrxs_csum++; 2023 else 2024 rxq->vtnrx_stats.vrxs_csum_failed++; 2025 } 2026 2027 if (hdr->gso_size != 0) { 2028 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2029 case VIRTIO_NET_HDR_GSO_TCPV4: 2030 case VIRTIO_NET_HDR_GSO_TCPV6: 2031 m->m_pkthdr.lro_nsegs = 2032 howmany(m->m_pkthdr.len, hdr->gso_size); 2033 rxq->vtnrx_stats.vrxs_host_lro++; 2034 break; 2035 } 2036 } 2037 2038 rxq->vtnrx_stats.vrxs_ipackets++; 2039 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2040 2041 #if defined(INET) || defined(INET6) 2042 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2043 if (vtnet_lro_rx(rxq, m) == 0) 2044 return; 2045 } 2046 #endif 2047 2048 if_input(ifp, m); 2049 } 2050 2051 static int 2052 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2053 { 2054 struct virtio_net_hdr lhdr, *hdr; 2055 struct vtnet_softc *sc; 2056 if_t ifp; 2057 struct virtqueue *vq; 2058 int deq, count; 2059 2060 sc = rxq->vtnrx_sc; 2061 vq = rxq->vtnrx_vq; 2062 ifp = sc->vtnet_ifp; 2063 deq = 0; 2064 count = sc->vtnet_rx_process_limit; 2065 2066 VTNET_RXQ_LOCK_ASSERT(rxq); 2067 2068 while (count-- > 0) { 2069 struct mbuf *m; 2070 uint32_t len, nbufs, adjsz; 2071 2072 m = virtqueue_dequeue(vq, &len); 2073 if (m == NULL) 2074 break; 2075 deq++; 2076 2077 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2078 rxq->vtnrx_stats.vrxs_ierrors++; 2079 vtnet_rxq_discard_buf(rxq, m); 2080 continue; 2081 } 2082 2083 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2084 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2085 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2086 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2087 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2088 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2089 } else if (vtnet_modern(sc)) { 2090 nbufs = 1; /* num_buffers is always 1 */ 2091 adjsz = sizeof(struct virtio_net_hdr_v1); 2092 } else { 2093 nbufs = 1; 2094 adjsz = sizeof(struct vtnet_rx_header); 2095 /* 2096 * Account for our gap between the header and start of 2097 * data to keep the segments separated. 2098 */ 2099 len += VTNET_RX_HEADER_PAD; 2100 } 2101 2102 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2103 rxq->vtnrx_stats.vrxs_iqdrops++; 2104 vtnet_rxq_discard_buf(rxq, m); 2105 if (nbufs > 1) 2106 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2107 continue; 2108 } 2109 2110 m->m_pkthdr.len = len; 2111 m->m_pkthdr.rcvif = ifp; 2112 m->m_pkthdr.csum_flags = 0; 2113 2114 if (nbufs > 1) { 2115 /* Dequeue the rest of chain. */ 2116 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2117 continue; 2118 } 2119 2120 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2121 2122 /* 2123 * Save an endian swapped version of the header prior to it 2124 * being stripped. The header is always at the start of the 2125 * mbuf data. num_buffers was already saved (and not needed) 2126 * so use the standard header. 2127 */ 2128 hdr = mtod(m, struct virtio_net_hdr *); 2129 lhdr.flags = hdr->flags; 2130 lhdr.gso_type = hdr->gso_type; 2131 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2132 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2133 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2134 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2135 m_adj(m, adjsz); 2136 2137 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2138 pfil_return_t pfil; 2139 2140 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN, 2141 NULL); 2142 switch (pfil) { 2143 case PFIL_REALLOCED: 2144 m = pfil_mem2mbuf(m->m_data); 2145 break; 2146 case PFIL_DROPPED: 2147 case PFIL_CONSUMED: 2148 continue; 2149 default: 2150 KASSERT(pfil == PFIL_PASS, 2151 ("Filter returned %d!", pfil)); 2152 } 2153 } 2154 2155 vtnet_rxq_input(rxq, m, &lhdr); 2156 } 2157 2158 if (deq > 0) { 2159 #if defined(INET) || defined(INET6) 2160 if (vtnet_software_lro(sc)) 2161 tcp_lro_flush_all(&rxq->vtnrx_lro); 2162 #endif 2163 virtqueue_notify(vq); 2164 } 2165 2166 return (count > 0 ? 0 : EAGAIN); 2167 } 2168 2169 static void 2170 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2171 { 2172 struct vtnet_softc *sc; 2173 if_t ifp; 2174 u_int more; 2175 #ifdef DEV_NETMAP 2176 int nmirq; 2177 #endif /* DEV_NETMAP */ 2178 2179 sc = rxq->vtnrx_sc; 2180 ifp = sc->vtnet_ifp; 2181 2182 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2183 /* 2184 * Ignore this interrupt. Either this is a spurious interrupt 2185 * or multiqueue without per-VQ MSIX so every queue needs to 2186 * be polled (a brain dead configuration we could try harder 2187 * to avoid). 2188 */ 2189 vtnet_rxq_disable_intr(rxq); 2190 return; 2191 } 2192 2193 VTNET_RXQ_LOCK(rxq); 2194 2195 #ifdef DEV_NETMAP 2196 /* 2197 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2198 * This is not necessary to serialize the access to the RX vq, but 2199 * rather to avoid races that may happen if this interface is 2200 * attached to a VALE switch, which would cause received packets 2201 * to stall in the RX queue (nm_kr_tryget() could find the kring 2202 * busy when called from netmap_bwrap_intr_notify()). 2203 */ 2204 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2205 if (nmirq != NM_IRQ_PASS) { 2206 VTNET_RXQ_UNLOCK(rxq); 2207 if (nmirq == NM_IRQ_RESCHED) { 2208 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2209 } 2210 return; 2211 } 2212 #endif /* DEV_NETMAP */ 2213 2214 again: 2215 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2216 VTNET_RXQ_UNLOCK(rxq); 2217 return; 2218 } 2219 2220 more = vtnet_rxq_eof(rxq); 2221 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2222 if (!more) 2223 vtnet_rxq_disable_intr(rxq); 2224 /* 2225 * This is an occasional condition or race (when !more), 2226 * so retry a few times before scheduling the taskqueue. 2227 */ 2228 if (tries-- > 0) 2229 goto again; 2230 2231 rxq->vtnrx_stats.vrxs_rescheduled++; 2232 VTNET_RXQ_UNLOCK(rxq); 2233 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2234 } else 2235 VTNET_RXQ_UNLOCK(rxq); 2236 } 2237 2238 static void 2239 vtnet_rx_vq_intr(void *xrxq) 2240 { 2241 struct vtnet_rxq *rxq; 2242 2243 rxq = xrxq; 2244 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2245 } 2246 2247 static void 2248 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2249 { 2250 struct vtnet_rxq *rxq; 2251 2252 rxq = xrxq; 2253 vtnet_rx_vq_process(rxq, 0); 2254 } 2255 2256 static int 2257 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2258 { 2259 struct vtnet_softc *sc; 2260 int threshold; 2261 2262 sc = txq->vtntx_sc; 2263 2264 /* 2265 * The Tx interrupt is disabled until the queue free count falls 2266 * below our threshold. Completed frames are drained from the Tx 2267 * virtqueue before transmitting new frames and in the watchdog 2268 * callout, so the frequency of Tx interrupts is greatly reduced, 2269 * at the cost of not freeing mbufs as quickly as they otherwise 2270 * would be. 2271 */ 2272 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2273 2274 /* 2275 * Without indirect descriptors, leave enough room for the most 2276 * segments we handle. 2277 */ 2278 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2279 threshold < sc->vtnet_tx_nsegs) 2280 threshold = sc->vtnet_tx_nsegs; 2281 2282 return (threshold); 2283 } 2284 2285 static int 2286 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2287 { 2288 struct virtqueue *vq; 2289 2290 vq = txq->vtntx_vq; 2291 2292 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2293 } 2294 2295 static int 2296 vtnet_txq_notify(struct vtnet_txq *txq) 2297 { 2298 struct virtqueue *vq; 2299 2300 vq = txq->vtntx_vq; 2301 2302 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2303 virtqueue_notify(vq); 2304 2305 if (vtnet_txq_enable_intr(txq) == 0) 2306 return (0); 2307 2308 /* 2309 * Drain frames that were completed since last checked. If this 2310 * causes the queue to go above the threshold, the caller should 2311 * continue transmitting. 2312 */ 2313 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2314 virtqueue_disable_intr(vq); 2315 return (1); 2316 } 2317 2318 return (0); 2319 } 2320 2321 static void 2322 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2323 { 2324 struct virtqueue *vq; 2325 struct vtnet_tx_header *txhdr; 2326 int last; 2327 #ifdef DEV_NETMAP 2328 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2329 txq->vtntx_id, NR_TX); 2330 #else /* !DEV_NETMAP */ 2331 void *kring = NULL; 2332 #endif /* !DEV_NETMAP */ 2333 2334 vq = txq->vtntx_vq; 2335 last = 0; 2336 2337 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2338 if (kring == NULL) { 2339 m_freem(txhdr->vth_mbuf); 2340 uma_zfree(vtnet_tx_header_zone, txhdr); 2341 } 2342 } 2343 2344 KASSERT(virtqueue_empty(vq), 2345 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2346 } 2347 2348 /* 2349 * BMV: This can go away once we finally have offsets in the mbuf header. 2350 */ 2351 static int 2352 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2353 int *proto, int *start) 2354 { 2355 struct vtnet_softc *sc; 2356 struct ether_vlan_header *evh; 2357 #if defined(INET) || defined(INET6) 2358 int offset; 2359 #endif 2360 2361 sc = txq->vtntx_sc; 2362 2363 evh = mtod(m, struct ether_vlan_header *); 2364 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2365 /* BMV: We should handle nested VLAN tags too. */ 2366 *etype = ntohs(evh->evl_proto); 2367 #if defined(INET) || defined(INET6) 2368 offset = sizeof(struct ether_vlan_header); 2369 #endif 2370 } else { 2371 *etype = ntohs(evh->evl_encap_proto); 2372 #if defined(INET) || defined(INET6) 2373 offset = sizeof(struct ether_header); 2374 #endif 2375 } 2376 2377 switch (*etype) { 2378 #if defined(INET) 2379 case ETHERTYPE_IP: { 2380 struct ip *ip, iphdr; 2381 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2382 m_copydata(m, offset, sizeof(struct ip), 2383 (caddr_t) &iphdr); 2384 ip = &iphdr; 2385 } else 2386 ip = (struct ip *)(m->m_data + offset); 2387 *proto = ip->ip_p; 2388 *start = offset + (ip->ip_hl << 2); 2389 break; 2390 } 2391 #endif 2392 #if defined(INET6) 2393 case ETHERTYPE_IPV6: 2394 *proto = -1; 2395 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2396 /* Assert the network stack sent us a valid packet. */ 2397 KASSERT(*start > offset, 2398 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2399 *start, offset, *proto)); 2400 break; 2401 #endif 2402 default: 2403 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2404 return (EINVAL); 2405 } 2406 2407 return (0); 2408 } 2409 2410 static int 2411 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2412 int offset, struct virtio_net_hdr *hdr) 2413 { 2414 static struct timeval lastecn; 2415 static int curecn; 2416 struct vtnet_softc *sc; 2417 struct tcphdr *tcp, tcphdr; 2418 2419 sc = txq->vtntx_sc; 2420 2421 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2422 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2423 tcp = &tcphdr; 2424 } else 2425 tcp = (struct tcphdr *)(m->m_data + offset); 2426 2427 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2428 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2429 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2430 VIRTIO_NET_HDR_GSO_TCPV6; 2431 2432 if (__predict_false(tcp->th_flags & TH_CWR)) { 2433 /* 2434 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2435 * FreeBSD, ECN support is not on a per-interface basis, 2436 * but globally via the net.inet.tcp.ecn.enable sysctl 2437 * knob. The default is off. 2438 */ 2439 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2440 if (ppsratecheck(&lastecn, &curecn, 1)) 2441 if_printf(sc->vtnet_ifp, 2442 "TSO with ECN not negotiated with host\n"); 2443 return (ENOTSUP); 2444 } 2445 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2446 } 2447 2448 txq->vtntx_stats.vtxs_tso++; 2449 2450 return (0); 2451 } 2452 2453 static struct mbuf * 2454 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2455 struct virtio_net_hdr *hdr) 2456 { 2457 struct vtnet_softc *sc; 2458 int flags, etype, csum_start, proto, error; 2459 2460 sc = txq->vtntx_sc; 2461 flags = m->m_pkthdr.csum_flags; 2462 2463 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2464 if (error) 2465 goto drop; 2466 2467 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2468 /* Sanity check the parsed mbuf matches the offload flags. */ 2469 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2470 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2471 && etype != ETHERTYPE_IPV6))) { 2472 sc->vtnet_stats.tx_csum_proto_mismatch++; 2473 goto drop; 2474 } 2475 2476 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2477 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2478 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2479 txq->vtntx_stats.vtxs_csum++; 2480 } 2481 2482 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2483 /* 2484 * Sanity check the parsed mbuf IP protocol is TCP, and 2485 * VirtIO TSO reqires the checksum offloading above. 2486 */ 2487 if (__predict_false(proto != IPPROTO_TCP)) { 2488 sc->vtnet_stats.tx_tso_not_tcp++; 2489 goto drop; 2490 } else if (__predict_false((hdr->flags & 2491 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2492 sc->vtnet_stats.tx_tso_without_csum++; 2493 goto drop; 2494 } 2495 2496 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2497 if (error) 2498 goto drop; 2499 } 2500 2501 return (m); 2502 2503 drop: 2504 m_freem(m); 2505 return (NULL); 2506 } 2507 2508 static int 2509 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2510 struct vtnet_tx_header *txhdr) 2511 { 2512 struct vtnet_softc *sc; 2513 struct virtqueue *vq; 2514 struct sglist *sg; 2515 struct mbuf *m; 2516 int error; 2517 2518 sc = txq->vtntx_sc; 2519 vq = txq->vtntx_vq; 2520 sg = txq->vtntx_sg; 2521 m = *m_head; 2522 2523 sglist_reset(sg); 2524 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2525 if (error != 0 || sg->sg_nseg != 1) { 2526 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2527 __func__, error, sg->sg_nseg)); 2528 goto fail; 2529 } 2530 2531 error = sglist_append_mbuf(sg, m); 2532 if (error) { 2533 m = m_defrag(m, M_NOWAIT); 2534 if (m == NULL) 2535 goto fail; 2536 2537 *m_head = m; 2538 sc->vtnet_stats.tx_defragged++; 2539 2540 error = sglist_append_mbuf(sg, m); 2541 if (error) 2542 goto fail; 2543 } 2544 2545 txhdr->vth_mbuf = m; 2546 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2547 2548 return (error); 2549 2550 fail: 2551 sc->vtnet_stats.tx_defrag_failed++; 2552 m_freem(*m_head); 2553 *m_head = NULL; 2554 2555 return (ENOBUFS); 2556 } 2557 2558 static int 2559 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2560 { 2561 struct vtnet_tx_header *txhdr; 2562 struct virtio_net_hdr *hdr; 2563 struct mbuf *m; 2564 int error; 2565 2566 m = *m_head; 2567 M_ASSERTPKTHDR(m); 2568 2569 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2570 if (txhdr == NULL) { 2571 m_freem(m); 2572 *m_head = NULL; 2573 return (ENOMEM); 2574 } 2575 2576 /* 2577 * Always use the non-mergeable header, regardless if mergable headers 2578 * were negotiated, because for transmit num_buffers is always zero. 2579 * The vtnet_hdr_size is used to enqueue the right header size segment. 2580 */ 2581 hdr = &txhdr->vth_uhdr.hdr; 2582 2583 if (m->m_flags & M_VLANTAG) { 2584 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2585 if ((*m_head = m) == NULL) { 2586 error = ENOBUFS; 2587 goto fail; 2588 } 2589 m->m_flags &= ~M_VLANTAG; 2590 } 2591 2592 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2593 m = vtnet_txq_offload(txq, m, hdr); 2594 if ((*m_head = m) == NULL) { 2595 error = ENOBUFS; 2596 goto fail; 2597 } 2598 } 2599 2600 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2601 fail: 2602 if (error) 2603 uma_zfree(vtnet_tx_header_zone, txhdr); 2604 2605 return (error); 2606 } 2607 2608 #ifdef VTNET_LEGACY_TX 2609 2610 static void 2611 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2612 { 2613 struct vtnet_softc *sc; 2614 struct virtqueue *vq; 2615 struct mbuf *m0; 2616 int tries, enq; 2617 2618 sc = txq->vtntx_sc; 2619 vq = txq->vtntx_vq; 2620 tries = 0; 2621 2622 VTNET_TXQ_LOCK_ASSERT(txq); 2623 2624 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2625 sc->vtnet_link_active == 0) 2626 return; 2627 2628 vtnet_txq_eof(txq); 2629 2630 again: 2631 enq = 0; 2632 2633 while (!if_sendq_empty(ifp)) { 2634 if (virtqueue_full(vq)) 2635 break; 2636 2637 m0 = if_dequeue(ifp); 2638 if (m0 == NULL) 2639 break; 2640 2641 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2642 if (m0 != NULL) 2643 if_sendq_prepend(ifp, m0); 2644 break; 2645 } 2646 2647 enq++; 2648 ETHER_BPF_MTAP(ifp, m0); 2649 } 2650 2651 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2652 if (tries++ < VTNET_NOTIFY_RETRIES) 2653 goto again; 2654 2655 txq->vtntx_stats.vtxs_rescheduled++; 2656 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2657 } 2658 } 2659 2660 static void 2661 vtnet_start(if_t ifp) 2662 { 2663 struct vtnet_softc *sc; 2664 struct vtnet_txq *txq; 2665 2666 sc = if_getsoftc(ifp); 2667 txq = &sc->vtnet_txqs[0]; 2668 2669 VTNET_TXQ_LOCK(txq); 2670 vtnet_start_locked(txq, ifp); 2671 VTNET_TXQ_UNLOCK(txq); 2672 } 2673 2674 #else /* !VTNET_LEGACY_TX */ 2675 2676 static int 2677 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2678 { 2679 struct vtnet_softc *sc; 2680 struct virtqueue *vq; 2681 struct buf_ring *br; 2682 if_t ifp; 2683 int enq, tries, error; 2684 2685 sc = txq->vtntx_sc; 2686 vq = txq->vtntx_vq; 2687 br = txq->vtntx_br; 2688 ifp = sc->vtnet_ifp; 2689 tries = 0; 2690 error = 0; 2691 2692 VTNET_TXQ_LOCK_ASSERT(txq); 2693 2694 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2695 sc->vtnet_link_active == 0) { 2696 if (m != NULL) 2697 error = drbr_enqueue(ifp, br, m); 2698 return (error); 2699 } 2700 2701 if (m != NULL) { 2702 error = drbr_enqueue(ifp, br, m); 2703 if (error) 2704 return (error); 2705 } 2706 2707 vtnet_txq_eof(txq); 2708 2709 again: 2710 enq = 0; 2711 2712 while ((m = drbr_peek(ifp, br)) != NULL) { 2713 if (virtqueue_full(vq)) { 2714 drbr_putback(ifp, br, m); 2715 break; 2716 } 2717 2718 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2719 if (m != NULL) 2720 drbr_putback(ifp, br, m); 2721 else 2722 drbr_advance(ifp, br); 2723 break; 2724 } 2725 drbr_advance(ifp, br); 2726 2727 enq++; 2728 ETHER_BPF_MTAP(ifp, m); 2729 } 2730 2731 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2732 if (tries++ < VTNET_NOTIFY_RETRIES) 2733 goto again; 2734 2735 txq->vtntx_stats.vtxs_rescheduled++; 2736 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2737 } 2738 2739 return (0); 2740 } 2741 2742 static int 2743 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2744 { 2745 struct vtnet_softc *sc; 2746 struct vtnet_txq *txq; 2747 int i, npairs, error; 2748 2749 sc = if_getsoftc(ifp); 2750 npairs = sc->vtnet_act_vq_pairs; 2751 2752 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2753 i = m->m_pkthdr.flowid % npairs; 2754 else 2755 i = curcpu % npairs; 2756 2757 txq = &sc->vtnet_txqs[i]; 2758 2759 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2760 error = vtnet_txq_mq_start_locked(txq, m); 2761 VTNET_TXQ_UNLOCK(txq); 2762 } else { 2763 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2764 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2765 } 2766 2767 return (error); 2768 } 2769 2770 static void 2771 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2772 { 2773 struct vtnet_softc *sc; 2774 struct vtnet_txq *txq; 2775 2776 txq = xtxq; 2777 sc = txq->vtntx_sc; 2778 2779 VTNET_TXQ_LOCK(txq); 2780 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2781 vtnet_txq_mq_start_locked(txq, NULL); 2782 VTNET_TXQ_UNLOCK(txq); 2783 } 2784 2785 #endif /* VTNET_LEGACY_TX */ 2786 2787 static void 2788 vtnet_txq_start(struct vtnet_txq *txq) 2789 { 2790 struct vtnet_softc *sc; 2791 if_t ifp; 2792 2793 sc = txq->vtntx_sc; 2794 ifp = sc->vtnet_ifp; 2795 2796 #ifdef VTNET_LEGACY_TX 2797 if (!if_sendq_empty(ifp)) 2798 vtnet_start_locked(txq, ifp); 2799 #else 2800 if (!drbr_empty(ifp, txq->vtntx_br)) 2801 vtnet_txq_mq_start_locked(txq, NULL); 2802 #endif 2803 } 2804 2805 static void 2806 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2807 { 2808 struct vtnet_softc *sc; 2809 struct vtnet_txq *txq; 2810 if_t ifp; 2811 2812 txq = xtxq; 2813 sc = txq->vtntx_sc; 2814 ifp = sc->vtnet_ifp; 2815 2816 VTNET_TXQ_LOCK(txq); 2817 2818 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2819 VTNET_TXQ_UNLOCK(txq); 2820 return; 2821 } 2822 2823 vtnet_txq_eof(txq); 2824 vtnet_txq_start(txq); 2825 2826 VTNET_TXQ_UNLOCK(txq); 2827 } 2828 2829 static int 2830 vtnet_txq_eof(struct vtnet_txq *txq) 2831 { 2832 struct virtqueue *vq; 2833 struct vtnet_tx_header *txhdr; 2834 struct mbuf *m; 2835 int deq; 2836 2837 vq = txq->vtntx_vq; 2838 deq = 0; 2839 VTNET_TXQ_LOCK_ASSERT(txq); 2840 2841 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2842 m = txhdr->vth_mbuf; 2843 deq++; 2844 2845 txq->vtntx_stats.vtxs_opackets++; 2846 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2847 if (m->m_flags & M_MCAST) 2848 txq->vtntx_stats.vtxs_omcasts++; 2849 2850 m_freem(m); 2851 uma_zfree(vtnet_tx_header_zone, txhdr); 2852 } 2853 2854 if (virtqueue_empty(vq)) 2855 txq->vtntx_watchdog = 0; 2856 2857 return (deq); 2858 } 2859 2860 static void 2861 vtnet_tx_vq_intr(void *xtxq) 2862 { 2863 struct vtnet_softc *sc; 2864 struct vtnet_txq *txq; 2865 if_t ifp; 2866 2867 txq = xtxq; 2868 sc = txq->vtntx_sc; 2869 ifp = sc->vtnet_ifp; 2870 2871 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2872 /* 2873 * Ignore this interrupt. Either this is a spurious interrupt 2874 * or multiqueue without per-VQ MSIX so every queue needs to 2875 * be polled (a brain dead configuration we could try harder 2876 * to avoid). 2877 */ 2878 vtnet_txq_disable_intr(txq); 2879 return; 2880 } 2881 2882 #ifdef DEV_NETMAP 2883 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2884 return; 2885 #endif /* DEV_NETMAP */ 2886 2887 VTNET_TXQ_LOCK(txq); 2888 2889 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2890 VTNET_TXQ_UNLOCK(txq); 2891 return; 2892 } 2893 2894 vtnet_txq_eof(txq); 2895 vtnet_txq_start(txq); 2896 2897 VTNET_TXQ_UNLOCK(txq); 2898 } 2899 2900 static void 2901 vtnet_tx_start_all(struct vtnet_softc *sc) 2902 { 2903 struct vtnet_txq *txq; 2904 int i; 2905 2906 VTNET_CORE_LOCK_ASSERT(sc); 2907 2908 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2909 txq = &sc->vtnet_txqs[i]; 2910 2911 VTNET_TXQ_LOCK(txq); 2912 vtnet_txq_start(txq); 2913 VTNET_TXQ_UNLOCK(txq); 2914 } 2915 } 2916 2917 #ifndef VTNET_LEGACY_TX 2918 static void 2919 vtnet_qflush(if_t ifp) 2920 { 2921 struct vtnet_softc *sc; 2922 struct vtnet_txq *txq; 2923 struct mbuf *m; 2924 int i; 2925 2926 sc = if_getsoftc(ifp); 2927 2928 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2929 txq = &sc->vtnet_txqs[i]; 2930 2931 VTNET_TXQ_LOCK(txq); 2932 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2933 m_freem(m); 2934 VTNET_TXQ_UNLOCK(txq); 2935 } 2936 2937 if_qflush(ifp); 2938 } 2939 #endif 2940 2941 static int 2942 vtnet_watchdog(struct vtnet_txq *txq) 2943 { 2944 if_t ifp; 2945 2946 ifp = txq->vtntx_sc->vtnet_ifp; 2947 2948 VTNET_TXQ_LOCK(txq); 2949 if (txq->vtntx_watchdog == 1) { 2950 /* 2951 * Only drain completed frames if the watchdog is about to 2952 * expire. If any frames were drained, there may be enough 2953 * free descriptors now available to transmit queued frames. 2954 * In that case, the timer will immediately be decremented 2955 * below, but the timeout is generous enough that should not 2956 * be a problem. 2957 */ 2958 if (vtnet_txq_eof(txq) != 0) 2959 vtnet_txq_start(txq); 2960 } 2961 2962 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2963 VTNET_TXQ_UNLOCK(txq); 2964 return (0); 2965 } 2966 VTNET_TXQ_UNLOCK(txq); 2967 2968 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2969 return (1); 2970 } 2971 2972 static void 2973 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2974 struct vtnet_txq_stats *txacc) 2975 { 2976 2977 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2978 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2979 2980 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2981 struct vtnet_rxq_stats *rxst; 2982 struct vtnet_txq_stats *txst; 2983 2984 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 2985 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 2986 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 2987 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 2988 rxacc->vrxs_csum += rxst->vrxs_csum; 2989 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 2990 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 2991 2992 txst = &sc->vtnet_txqs[i].vtntx_stats; 2993 txacc->vtxs_opackets += txst->vtxs_opackets; 2994 txacc->vtxs_obytes += txst->vtxs_obytes; 2995 txacc->vtxs_csum += txst->vtxs_csum; 2996 txacc->vtxs_tso += txst->vtxs_tso; 2997 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 2998 } 2999 } 3000 3001 static uint64_t 3002 vtnet_get_counter(if_t ifp, ift_counter cnt) 3003 { 3004 struct vtnet_softc *sc; 3005 struct vtnet_rxq_stats rxaccum; 3006 struct vtnet_txq_stats txaccum; 3007 3008 sc = if_getsoftc(ifp); 3009 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3010 3011 switch (cnt) { 3012 case IFCOUNTER_IPACKETS: 3013 return (rxaccum.vrxs_ipackets); 3014 case IFCOUNTER_IQDROPS: 3015 return (rxaccum.vrxs_iqdrops); 3016 case IFCOUNTER_IERRORS: 3017 return (rxaccum.vrxs_ierrors); 3018 case IFCOUNTER_OPACKETS: 3019 return (txaccum.vtxs_opackets); 3020 #ifndef VTNET_LEGACY_TX 3021 case IFCOUNTER_OBYTES: 3022 return (txaccum.vtxs_obytes); 3023 case IFCOUNTER_OMCASTS: 3024 return (txaccum.vtxs_omcasts); 3025 #endif 3026 default: 3027 return (if_get_counter_default(ifp, cnt)); 3028 } 3029 } 3030 3031 static void 3032 vtnet_tick(void *xsc) 3033 { 3034 struct vtnet_softc *sc; 3035 if_t ifp; 3036 int i, timedout; 3037 3038 sc = xsc; 3039 ifp = sc->vtnet_ifp; 3040 timedout = 0; 3041 3042 VTNET_CORE_LOCK_ASSERT(sc); 3043 3044 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3045 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3046 3047 if (timedout != 0) { 3048 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3049 vtnet_init_locked(sc, 0); 3050 } else 3051 callout_schedule(&sc->vtnet_tick_ch, hz); 3052 } 3053 3054 static void 3055 vtnet_start_taskqueues(struct vtnet_softc *sc) 3056 { 3057 device_t dev; 3058 struct vtnet_rxq *rxq; 3059 struct vtnet_txq *txq; 3060 int i, error; 3061 3062 dev = sc->vtnet_dev; 3063 3064 /* 3065 * Errors here are very difficult to recover from - we cannot 3066 * easily fail because, if this is during boot, we will hang 3067 * when freeing any successfully started taskqueues because 3068 * the scheduler isn't up yet. 3069 * 3070 * Most drivers just ignore the return value - it only fails 3071 * with ENOMEM so an error is not likely. 3072 */ 3073 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3074 rxq = &sc->vtnet_rxqs[i]; 3075 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3076 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3077 if (error) { 3078 device_printf(dev, "failed to start rx taskq %d\n", 3079 rxq->vtnrx_id); 3080 } 3081 3082 txq = &sc->vtnet_txqs[i]; 3083 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3084 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3085 if (error) { 3086 device_printf(dev, "failed to start tx taskq %d\n", 3087 txq->vtntx_id); 3088 } 3089 } 3090 } 3091 3092 static void 3093 vtnet_free_taskqueues(struct vtnet_softc *sc) 3094 { 3095 struct vtnet_rxq *rxq; 3096 struct vtnet_txq *txq; 3097 int i; 3098 3099 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3100 rxq = &sc->vtnet_rxqs[i]; 3101 if (rxq->vtnrx_tq != NULL) { 3102 taskqueue_free(rxq->vtnrx_tq); 3103 rxq->vtnrx_tq = NULL; 3104 } 3105 3106 txq = &sc->vtnet_txqs[i]; 3107 if (txq->vtntx_tq != NULL) { 3108 taskqueue_free(txq->vtntx_tq); 3109 txq->vtntx_tq = NULL; 3110 } 3111 } 3112 } 3113 3114 static void 3115 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3116 { 3117 struct vtnet_rxq *rxq; 3118 struct vtnet_txq *txq; 3119 int i; 3120 3121 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3122 rxq = &sc->vtnet_rxqs[i]; 3123 if (rxq->vtnrx_tq != NULL) 3124 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3125 3126 txq = &sc->vtnet_txqs[i]; 3127 if (txq->vtntx_tq != NULL) { 3128 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3129 #ifndef VTNET_LEGACY_TX 3130 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3131 #endif 3132 } 3133 } 3134 } 3135 3136 static void 3137 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3138 { 3139 struct vtnet_rxq *rxq; 3140 struct vtnet_txq *txq; 3141 int i; 3142 3143 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3144 rxq = &sc->vtnet_rxqs[i]; 3145 vtnet_rxq_free_mbufs(rxq); 3146 3147 txq = &sc->vtnet_txqs[i]; 3148 vtnet_txq_free_mbufs(txq); 3149 } 3150 } 3151 3152 static void 3153 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3154 { 3155 struct vtnet_rxq *rxq; 3156 struct vtnet_txq *txq; 3157 int i; 3158 3159 VTNET_CORE_LOCK_ASSERT(sc); 3160 3161 /* 3162 * Lock and unlock the per-queue mutex so we known the stop 3163 * state is visible. Doing only the active queues should be 3164 * sufficient, but it does not cost much extra to do all the 3165 * queues. 3166 */ 3167 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3168 rxq = &sc->vtnet_rxqs[i]; 3169 VTNET_RXQ_LOCK(rxq); 3170 VTNET_RXQ_UNLOCK(rxq); 3171 3172 txq = &sc->vtnet_txqs[i]; 3173 VTNET_TXQ_LOCK(txq); 3174 VTNET_TXQ_UNLOCK(txq); 3175 } 3176 } 3177 3178 static void 3179 vtnet_stop(struct vtnet_softc *sc) 3180 { 3181 device_t dev; 3182 if_t ifp; 3183 3184 dev = sc->vtnet_dev; 3185 ifp = sc->vtnet_ifp; 3186 3187 VTNET_CORE_LOCK_ASSERT(sc); 3188 3189 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3190 sc->vtnet_link_active = 0; 3191 callout_stop(&sc->vtnet_tick_ch); 3192 3193 /* Only advisory. */ 3194 vtnet_disable_interrupts(sc); 3195 3196 #ifdef DEV_NETMAP 3197 /* Stop any pending txsync/rxsync and disable them. */ 3198 netmap_disable_all_rings(ifp); 3199 #endif /* DEV_NETMAP */ 3200 3201 /* 3202 * Stop the host adapter. This resets it to the pre-initialized 3203 * state. It will not generate any interrupts until after it is 3204 * reinitialized. 3205 */ 3206 virtio_stop(dev); 3207 vtnet_stop_rendezvous(sc); 3208 3209 vtnet_drain_rxtx_queues(sc); 3210 sc->vtnet_act_vq_pairs = 1; 3211 } 3212 3213 static int 3214 vtnet_virtio_reinit(struct vtnet_softc *sc) 3215 { 3216 device_t dev; 3217 if_t ifp; 3218 uint64_t features; 3219 int error; 3220 3221 dev = sc->vtnet_dev; 3222 ifp = sc->vtnet_ifp; 3223 features = sc->vtnet_negotiated_features; 3224 3225 /* 3226 * Re-negotiate with the host, removing any disabled receive 3227 * features. Transmit features are disabled only on our side 3228 * via if_capenable and if_hwassist. 3229 */ 3230 3231 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3232 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3233 3234 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3235 features &= ~VTNET_LRO_FEATURES; 3236 3237 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3238 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3239 3240 error = virtio_reinit(dev, features); 3241 if (error) { 3242 device_printf(dev, "virtio reinit error %d\n", error); 3243 return (error); 3244 } 3245 3246 sc->vtnet_features = features; 3247 virtio_reinit_complete(dev); 3248 3249 return (0); 3250 } 3251 3252 static void 3253 vtnet_init_rx_filters(struct vtnet_softc *sc) 3254 { 3255 if_t ifp; 3256 3257 ifp = sc->vtnet_ifp; 3258 3259 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3260 vtnet_rx_filter(sc); 3261 vtnet_rx_filter_mac(sc); 3262 } 3263 3264 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3265 vtnet_rx_filter_vlan(sc); 3266 } 3267 3268 static int 3269 vtnet_init_rx_queues(struct vtnet_softc *sc) 3270 { 3271 device_t dev; 3272 if_t ifp; 3273 struct vtnet_rxq *rxq; 3274 int i, clustersz, error; 3275 3276 dev = sc->vtnet_dev; 3277 ifp = sc->vtnet_ifp; 3278 3279 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3280 sc->vtnet_rx_clustersz = clustersz; 3281 3282 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3283 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3284 VTNET_MAX_RX_SIZE, clustersz); 3285 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3286 ("%s: too many rx mbufs %d for %d segments", __func__, 3287 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3288 } else 3289 sc->vtnet_rx_nmbufs = 1; 3290 3291 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3292 rxq = &sc->vtnet_rxqs[i]; 3293 3294 /* Hold the lock to satisfy asserts. */ 3295 VTNET_RXQ_LOCK(rxq); 3296 error = vtnet_rxq_populate(rxq); 3297 VTNET_RXQ_UNLOCK(rxq); 3298 3299 if (error) { 3300 device_printf(dev, "cannot populate Rx queue %d\n", i); 3301 return (error); 3302 } 3303 } 3304 3305 return (0); 3306 } 3307 3308 static int 3309 vtnet_init_tx_queues(struct vtnet_softc *sc) 3310 { 3311 struct vtnet_txq *txq; 3312 int i; 3313 3314 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3315 txq = &sc->vtnet_txqs[i]; 3316 txq->vtntx_watchdog = 0; 3317 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3318 #ifdef DEV_NETMAP 3319 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3320 #endif /* DEV_NETMAP */ 3321 } 3322 3323 return (0); 3324 } 3325 3326 static int 3327 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3328 { 3329 int error; 3330 3331 error = vtnet_init_rx_queues(sc); 3332 if (error) 3333 return (error); 3334 3335 error = vtnet_init_tx_queues(sc); 3336 if (error) 3337 return (error); 3338 3339 return (0); 3340 } 3341 3342 static void 3343 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3344 { 3345 device_t dev; 3346 int npairs; 3347 3348 dev = sc->vtnet_dev; 3349 3350 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3351 sc->vtnet_act_vq_pairs = 1; 3352 return; 3353 } 3354 3355 npairs = sc->vtnet_req_vq_pairs; 3356 3357 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3358 device_printf(dev, "cannot set active queue pairs to %d, " 3359 "falling back to 1 queue pair\n", npairs); 3360 npairs = 1; 3361 } 3362 3363 sc->vtnet_act_vq_pairs = npairs; 3364 } 3365 3366 static void 3367 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3368 { 3369 if_t ifp; 3370 uint64_t features; 3371 int error; 3372 3373 ifp = sc->vtnet_ifp; 3374 features = sc->vtnet_features; 3375 3376 VTNET_CORE_LOCK_ASSERT(sc); 3377 3378 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3379 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3380 features |= VIRTIO_NET_F_GUEST_CSUM; 3381 else 3382 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3383 } 3384 3385 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3386 if (if_getcapenable(ifp) & IFCAP_LRO) 3387 features |= VTNET_LRO_FEATURES; 3388 else 3389 features &= ~VTNET_LRO_FEATURES; 3390 } 3391 3392 error = vtnet_ctrl_guest_offloads(sc, 3393 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3394 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3395 VIRTIO_NET_F_GUEST_UFO)); 3396 if (error) { 3397 device_printf(sc->vtnet_dev, 3398 "%s: cannot update Rx features\n", __func__); 3399 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3400 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3401 vtnet_init_locked(sc, 0); 3402 } 3403 } else 3404 sc->vtnet_features = features; 3405 } 3406 3407 static int 3408 vtnet_reinit(struct vtnet_softc *sc) 3409 { 3410 if_t ifp; 3411 int error; 3412 3413 ifp = sc->vtnet_ifp; 3414 3415 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3416 3417 error = vtnet_virtio_reinit(sc); 3418 if (error) 3419 return (error); 3420 3421 vtnet_set_macaddr(sc); 3422 vtnet_set_active_vq_pairs(sc); 3423 3424 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3425 vtnet_init_rx_filters(sc); 3426 3427 if_sethwassist(ifp, 0); 3428 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3429 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3430 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3431 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3432 if (if_getcapenable(ifp) & IFCAP_TSO4) 3433 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3434 if (if_getcapenable(ifp) & IFCAP_TSO6) 3435 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3436 3437 error = vtnet_init_rxtx_queues(sc); 3438 if (error) 3439 return (error); 3440 3441 return (0); 3442 } 3443 3444 static void 3445 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3446 { 3447 if_t ifp; 3448 3449 ifp = sc->vtnet_ifp; 3450 3451 VTNET_CORE_LOCK_ASSERT(sc); 3452 3453 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3454 return; 3455 3456 vtnet_stop(sc); 3457 3458 #ifdef DEV_NETMAP 3459 /* Once stopped we can update the netmap flags, if necessary. */ 3460 switch (init_mode) { 3461 case VTNET_INIT_NETMAP_ENTER: 3462 nm_set_native_flags(NA(ifp)); 3463 break; 3464 case VTNET_INIT_NETMAP_EXIT: 3465 nm_clear_native_flags(NA(ifp)); 3466 break; 3467 } 3468 #endif /* DEV_NETMAP */ 3469 3470 if (vtnet_reinit(sc) != 0) { 3471 vtnet_stop(sc); 3472 return; 3473 } 3474 3475 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3476 vtnet_update_link_status(sc); 3477 vtnet_enable_interrupts(sc); 3478 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3479 3480 #ifdef DEV_NETMAP 3481 /* Re-enable txsync/rxsync. */ 3482 netmap_enable_all_rings(ifp); 3483 #endif /* DEV_NETMAP */ 3484 } 3485 3486 static void 3487 vtnet_init(void *xsc) 3488 { 3489 struct vtnet_softc *sc; 3490 3491 sc = xsc; 3492 3493 VTNET_CORE_LOCK(sc); 3494 vtnet_init_locked(sc, 0); 3495 VTNET_CORE_UNLOCK(sc); 3496 } 3497 3498 static void 3499 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3500 { 3501 3502 /* 3503 * The control virtqueue is only polled and therefore it should 3504 * already be empty. 3505 */ 3506 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3507 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3508 } 3509 3510 static void 3511 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3512 struct sglist *sg, int readable, int writable) 3513 { 3514 struct virtqueue *vq; 3515 3516 vq = sc->vtnet_ctrl_vq; 3517 3518 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3519 VTNET_CORE_LOCK_ASSERT(sc); 3520 3521 if (!virtqueue_empty(vq)) 3522 return; 3523 3524 /* 3525 * Poll for the response, but the command is likely completed before 3526 * returning from the notify. 3527 */ 3528 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3529 virtqueue_notify(vq); 3530 virtqueue_poll(vq, NULL); 3531 } 3532 } 3533 3534 static int 3535 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3536 { 3537 struct sglist_seg segs[3]; 3538 struct sglist sg; 3539 struct { 3540 struct virtio_net_ctrl_hdr hdr __aligned(2); 3541 uint8_t pad1; 3542 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3543 uint8_t pad2; 3544 uint8_t ack; 3545 } s; 3546 int error; 3547 3548 error = 0; 3549 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3550 3551 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3552 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3553 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3554 s.ack = VIRTIO_NET_ERR; 3555 3556 sglist_init(&sg, nitems(segs), segs); 3557 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3558 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3559 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3560 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3561 3562 if (error == 0) 3563 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3564 3565 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3566 } 3567 3568 static int 3569 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3570 { 3571 struct sglist_seg segs[3]; 3572 struct sglist sg; 3573 struct { 3574 struct virtio_net_ctrl_hdr hdr __aligned(2); 3575 uint8_t pad1; 3576 uint64_t offloads __aligned(8); 3577 uint8_t pad2; 3578 uint8_t ack; 3579 } s; 3580 int error; 3581 3582 error = 0; 3583 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3584 3585 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3586 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3587 s.offloads = vtnet_gtoh64(sc, offloads); 3588 s.ack = VIRTIO_NET_ERR; 3589 3590 sglist_init(&sg, nitems(segs), segs); 3591 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3592 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3593 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3594 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3595 3596 if (error == 0) 3597 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3598 3599 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3600 } 3601 3602 static int 3603 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3604 { 3605 struct sglist_seg segs[3]; 3606 struct sglist sg; 3607 struct { 3608 struct virtio_net_ctrl_hdr hdr __aligned(2); 3609 uint8_t pad1; 3610 struct virtio_net_ctrl_mq mq __aligned(2); 3611 uint8_t pad2; 3612 uint8_t ack; 3613 } s; 3614 int error; 3615 3616 error = 0; 3617 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3618 3619 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3620 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3621 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3622 s.ack = VIRTIO_NET_ERR; 3623 3624 sglist_init(&sg, nitems(segs), segs); 3625 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3626 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3627 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3628 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3629 3630 if (error == 0) 3631 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3632 3633 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3634 } 3635 3636 static int 3637 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3638 { 3639 struct sglist_seg segs[3]; 3640 struct sglist sg; 3641 struct { 3642 struct virtio_net_ctrl_hdr hdr __aligned(2); 3643 uint8_t pad1; 3644 uint8_t onoff; 3645 uint8_t pad2; 3646 uint8_t ack; 3647 } s; 3648 int error; 3649 3650 error = 0; 3651 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3652 3653 s.hdr.class = VIRTIO_NET_CTRL_RX; 3654 s.hdr.cmd = cmd; 3655 s.onoff = on; 3656 s.ack = VIRTIO_NET_ERR; 3657 3658 sglist_init(&sg, nitems(segs), segs); 3659 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3660 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3661 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3662 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3663 3664 if (error == 0) 3665 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3666 3667 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3668 } 3669 3670 static int 3671 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3672 { 3673 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3674 } 3675 3676 static int 3677 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3678 { 3679 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3680 } 3681 3682 static void 3683 vtnet_rx_filter(struct vtnet_softc *sc) 3684 { 3685 device_t dev; 3686 if_t ifp; 3687 3688 dev = sc->vtnet_dev; 3689 ifp = sc->vtnet_ifp; 3690 3691 VTNET_CORE_LOCK_ASSERT(sc); 3692 3693 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3694 device_printf(dev, "cannot %s promiscuous mode\n", 3695 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3696 } 3697 3698 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3699 device_printf(dev, "cannot %s all-multicast mode\n", 3700 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3701 } 3702 } 3703 3704 static u_int 3705 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3706 { 3707 struct vtnet_softc *sc = arg; 3708 3709 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3710 return (0); 3711 3712 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3713 bcopy(LLADDR(sdl), 3714 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3715 ETHER_ADDR_LEN); 3716 3717 return (1); 3718 } 3719 3720 static u_int 3721 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3722 { 3723 struct vtnet_mac_filter *filter = arg; 3724 3725 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3726 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3727 ETHER_ADDR_LEN); 3728 3729 return (1); 3730 } 3731 3732 static void 3733 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3734 { 3735 struct virtio_net_ctrl_hdr hdr __aligned(2); 3736 struct vtnet_mac_filter *filter; 3737 struct sglist_seg segs[4]; 3738 struct sglist sg; 3739 if_t ifp; 3740 bool promisc, allmulti; 3741 u_int ucnt, mcnt; 3742 int error; 3743 uint8_t ack; 3744 3745 ifp = sc->vtnet_ifp; 3746 filter = sc->vtnet_mac_filter; 3747 error = 0; 3748 3749 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3750 VTNET_CORE_LOCK_ASSERT(sc); 3751 3752 /* Unicast MAC addresses: */ 3753 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3754 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3755 3756 if (promisc) { 3757 ucnt = 0; 3758 if_printf(ifp, "more than %d MAC addresses assigned, " 3759 "falling back to promiscuous mode\n", 3760 VTNET_MAX_MAC_ENTRIES); 3761 } 3762 3763 /* Multicast MAC addresses: */ 3764 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3765 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3766 3767 if (allmulti) { 3768 mcnt = 0; 3769 if_printf(ifp, "more than %d multicast MAC addresses " 3770 "assigned, falling back to all-multicast mode\n", 3771 VTNET_MAX_MAC_ENTRIES); 3772 } 3773 3774 if (promisc && allmulti) 3775 goto out; 3776 3777 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3778 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3779 3780 hdr.class = VIRTIO_NET_CTRL_MAC; 3781 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3782 ack = VIRTIO_NET_ERR; 3783 3784 sglist_init(&sg, nitems(segs), segs); 3785 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3786 error |= sglist_append(&sg, &filter->vmf_unicast, 3787 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3788 error |= sglist_append(&sg, &filter->vmf_multicast, 3789 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3790 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3791 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3792 3793 if (error == 0) 3794 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3795 if (ack != VIRTIO_NET_OK) 3796 if_printf(ifp, "error setting host MAC filter table\n"); 3797 3798 out: 3799 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3800 if_printf(ifp, "cannot enable promiscuous mode\n"); 3801 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3802 if_printf(ifp, "cannot enable all-multicast mode\n"); 3803 } 3804 3805 static int 3806 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3807 { 3808 struct sglist_seg segs[3]; 3809 struct sglist sg; 3810 struct { 3811 struct virtio_net_ctrl_hdr hdr __aligned(2); 3812 uint8_t pad1; 3813 uint16_t tag __aligned(2); 3814 uint8_t pad2; 3815 uint8_t ack; 3816 } s; 3817 int error; 3818 3819 error = 0; 3820 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3821 3822 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3823 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3824 s.tag = vtnet_gtoh16(sc, tag); 3825 s.ack = VIRTIO_NET_ERR; 3826 3827 sglist_init(&sg, nitems(segs), segs); 3828 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3829 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3830 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3831 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3832 3833 if (error == 0) 3834 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3835 3836 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3837 } 3838 3839 static void 3840 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3841 { 3842 int i, bit; 3843 uint32_t w; 3844 uint16_t tag; 3845 3846 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3847 VTNET_CORE_LOCK_ASSERT(sc); 3848 3849 /* Enable the filter for each configured VLAN. */ 3850 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3851 w = sc->vtnet_vlan_filter[i]; 3852 3853 while ((bit = ffs(w) - 1) != -1) { 3854 w &= ~(1 << bit); 3855 tag = sizeof(w) * CHAR_BIT * i + bit; 3856 3857 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3858 device_printf(sc->vtnet_dev, 3859 "cannot enable VLAN %d filter\n", tag); 3860 } 3861 } 3862 } 3863 } 3864 3865 static void 3866 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3867 { 3868 if_t ifp; 3869 int idx, bit; 3870 3871 ifp = sc->vtnet_ifp; 3872 idx = (tag >> 5) & 0x7F; 3873 bit = tag & 0x1F; 3874 3875 if (tag == 0 || tag > 4095) 3876 return; 3877 3878 VTNET_CORE_LOCK(sc); 3879 3880 if (add) 3881 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3882 else 3883 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3884 3885 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3886 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3887 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3888 device_printf(sc->vtnet_dev, 3889 "cannot %s VLAN %d %s the host filter table\n", 3890 add ? "add" : "remove", tag, add ? "to" : "from"); 3891 } 3892 3893 VTNET_CORE_UNLOCK(sc); 3894 } 3895 3896 static void 3897 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3898 { 3899 3900 if (if_getsoftc(ifp) != arg) 3901 return; 3902 3903 vtnet_update_vlan_filter(arg, 1, tag); 3904 } 3905 3906 static void 3907 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3908 { 3909 3910 if (if_getsoftc(ifp) != arg) 3911 return; 3912 3913 vtnet_update_vlan_filter(arg, 0, tag); 3914 } 3915 3916 static void 3917 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3918 { 3919 if_t ifp; 3920 uint32_t speed; 3921 3922 ifp = sc->vtnet_ifp; 3923 3924 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3925 return; 3926 3927 /* BMV: Ignore duplex. */ 3928 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3929 offsetof(struct virtio_net_config, speed)); 3930 if (speed != UINT32_MAX) 3931 if_setbaudrate(ifp, IF_Mbps(speed)); 3932 } 3933 3934 static int 3935 vtnet_is_link_up(struct vtnet_softc *sc) 3936 { 3937 uint16_t status; 3938 3939 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3940 return (1); 3941 3942 status = virtio_read_dev_config_2(sc->vtnet_dev, 3943 offsetof(struct virtio_net_config, status)); 3944 3945 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3946 } 3947 3948 static void 3949 vtnet_update_link_status(struct vtnet_softc *sc) 3950 { 3951 if_t ifp; 3952 int link; 3953 3954 ifp = sc->vtnet_ifp; 3955 VTNET_CORE_LOCK_ASSERT(sc); 3956 link = vtnet_is_link_up(sc); 3957 3958 /* Notify if the link status has changed. */ 3959 if (link != 0 && sc->vtnet_link_active == 0) { 3960 vtnet_update_speed_duplex(sc); 3961 sc->vtnet_link_active = 1; 3962 if_link_state_change(ifp, LINK_STATE_UP); 3963 } else if (link == 0 && sc->vtnet_link_active != 0) { 3964 sc->vtnet_link_active = 0; 3965 if_link_state_change(ifp, LINK_STATE_DOWN); 3966 } 3967 } 3968 3969 static int 3970 vtnet_ifmedia_upd(if_t ifp __unused) 3971 { 3972 return (EOPNOTSUPP); 3973 } 3974 3975 static void 3976 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 3977 { 3978 struct vtnet_softc *sc; 3979 3980 sc = if_getsoftc(ifp); 3981 3982 ifmr->ifm_status = IFM_AVALID; 3983 ifmr->ifm_active = IFM_ETHER; 3984 3985 VTNET_CORE_LOCK(sc); 3986 if (vtnet_is_link_up(sc) != 0) { 3987 ifmr->ifm_status |= IFM_ACTIVE; 3988 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 3989 } else 3990 ifmr->ifm_active |= IFM_NONE; 3991 VTNET_CORE_UNLOCK(sc); 3992 } 3993 3994 static void 3995 vtnet_get_macaddr(struct vtnet_softc *sc) 3996 { 3997 3998 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 3999 virtio_read_device_config_array(sc->vtnet_dev, 4000 offsetof(struct virtio_net_config, mac), 4001 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4002 } else { 4003 /* Generate a random locally administered unicast address. */ 4004 sc->vtnet_hwaddr[0] = 0xB2; 4005 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4006 } 4007 } 4008 4009 static void 4010 vtnet_set_macaddr(struct vtnet_softc *sc) 4011 { 4012 device_t dev; 4013 int error; 4014 4015 dev = sc->vtnet_dev; 4016 4017 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4018 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4019 if (error) 4020 device_printf(dev, "unable to set MAC address\n"); 4021 return; 4022 } 4023 4024 /* MAC in config is read-only in modern VirtIO. */ 4025 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4026 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4027 virtio_write_dev_config_1(dev, 4028 offsetof(struct virtio_net_config, mac) + i, 4029 sc->vtnet_hwaddr[i]); 4030 } 4031 } 4032 } 4033 4034 static void 4035 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4036 { 4037 4038 /* Assign MAC address if it was generated. */ 4039 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4040 vtnet_set_macaddr(sc); 4041 } 4042 4043 static void 4044 vtnet_vlan_tag_remove(struct mbuf *m) 4045 { 4046 struct ether_vlan_header *evh; 4047 4048 evh = mtod(m, struct ether_vlan_header *); 4049 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4050 m->m_flags |= M_VLANTAG; 4051 4052 /* Strip the 802.1Q header. */ 4053 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4054 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4055 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4056 } 4057 4058 static void 4059 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4060 { 4061 int limit; 4062 4063 limit = vtnet_tunable_int(sc, "rx_process_limit", 4064 vtnet_rx_process_limit); 4065 if (limit < 0) 4066 limit = INT_MAX; 4067 sc->vtnet_rx_process_limit = limit; 4068 } 4069 4070 static void 4071 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4072 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4073 { 4074 struct sysctl_oid *node; 4075 struct sysctl_oid_list *list; 4076 struct vtnet_rxq_stats *stats; 4077 char namebuf[16]; 4078 4079 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4080 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4081 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4082 list = SYSCTL_CHILDREN(node); 4083 4084 stats = &rxq->vtnrx_stats; 4085 4086 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4087 &stats->vrxs_ipackets, "Receive packets"); 4088 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4089 &stats->vrxs_ibytes, "Receive bytes"); 4090 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4091 &stats->vrxs_iqdrops, "Receive drops"); 4092 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4093 &stats->vrxs_ierrors, "Receive errors"); 4094 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4095 &stats->vrxs_csum, "Receive checksum offloaded"); 4096 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4097 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4098 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4099 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4100 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4101 &stats->vrxs_rescheduled, 4102 "Receive interrupt handler rescheduled"); 4103 } 4104 4105 static void 4106 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4107 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4108 { 4109 struct sysctl_oid *node; 4110 struct sysctl_oid_list *list; 4111 struct vtnet_txq_stats *stats; 4112 char namebuf[16]; 4113 4114 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4115 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4116 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4117 list = SYSCTL_CHILDREN(node); 4118 4119 stats = &txq->vtntx_stats; 4120 4121 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4122 &stats->vtxs_opackets, "Transmit packets"); 4123 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4124 &stats->vtxs_obytes, "Transmit bytes"); 4125 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4126 &stats->vtxs_omcasts, "Transmit multicasts"); 4127 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4128 &stats->vtxs_csum, "Transmit checksum offloaded"); 4129 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4130 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4131 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4132 &stats->vtxs_rescheduled, 4133 "Transmit interrupt handler rescheduled"); 4134 } 4135 4136 static void 4137 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4138 { 4139 device_t dev; 4140 struct sysctl_ctx_list *ctx; 4141 struct sysctl_oid *tree; 4142 struct sysctl_oid_list *child; 4143 int i; 4144 4145 dev = sc->vtnet_dev; 4146 ctx = device_get_sysctl_ctx(dev); 4147 tree = device_get_sysctl_tree(dev); 4148 child = SYSCTL_CHILDREN(tree); 4149 4150 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4151 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4152 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4153 } 4154 } 4155 4156 static void 4157 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4158 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4159 { 4160 struct vtnet_statistics *stats; 4161 struct vtnet_rxq_stats rxaccum; 4162 struct vtnet_txq_stats txaccum; 4163 4164 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4165 4166 stats = &sc->vtnet_stats; 4167 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4168 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4169 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4170 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4171 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4172 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4173 4174 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4175 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4176 "Mbuf cluster allocation failures"); 4177 4178 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4179 CTLFLAG_RD, &stats->rx_frame_too_large, 4180 "Received frame larger than the mbuf chain"); 4181 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4182 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4183 "Enqueuing the replacement receive mbuf failed"); 4184 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4185 CTLFLAG_RD, &stats->rx_mergeable_failed, 4186 "Mergeable buffers receive failures"); 4187 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4188 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4189 "Received checksum offloaded buffer with unsupported " 4190 "Ethernet type"); 4191 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4192 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4193 "Received checksum offloaded buffer with incorrect IP protocol"); 4194 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4195 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4196 "Received checksum offloaded buffer with incorrect offset"); 4197 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4198 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4199 "Received checksum offloaded buffer with incorrect protocol"); 4200 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4201 CTLFLAG_RD, &stats->rx_csum_failed, 4202 "Received buffer checksum offload failed"); 4203 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4204 CTLFLAG_RD, &stats->rx_csum_offloaded, 4205 "Received buffer checksum offload succeeded"); 4206 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4207 CTLFLAG_RD, &stats->rx_task_rescheduled, 4208 "Times the receive interrupt task rescheduled itself"); 4209 4210 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4211 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4212 "Aborted transmit of checksum offloaded buffer with unknown " 4213 "Ethernet type"); 4214 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4215 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4216 "Aborted transmit of checksum offloaded buffer because mismatched " 4217 "protocols"); 4218 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4219 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4220 "Aborted transmit of TSO buffer with non TCP protocol"); 4221 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4222 CTLFLAG_RD, &stats->tx_tso_without_csum, 4223 "Aborted transmit of TSO buffer without TCP checksum offload"); 4224 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4225 CTLFLAG_RD, &stats->tx_defragged, 4226 "Transmit mbufs defragged"); 4227 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4228 CTLFLAG_RD, &stats->tx_defrag_failed, 4229 "Aborted transmit of buffer because defrag failed"); 4230 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4231 CTLFLAG_RD, &stats->tx_csum_offloaded, 4232 "Offloaded checksum of transmitted buffer"); 4233 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4234 CTLFLAG_RD, &stats->tx_tso_offloaded, 4235 "Segmentation offload of transmitted buffer"); 4236 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4237 CTLFLAG_RD, &stats->tx_task_rescheduled, 4238 "Times the transmit interrupt task rescheduled itself"); 4239 } 4240 4241 static void 4242 vtnet_setup_sysctl(struct vtnet_softc *sc) 4243 { 4244 device_t dev; 4245 struct sysctl_ctx_list *ctx; 4246 struct sysctl_oid *tree; 4247 struct sysctl_oid_list *child; 4248 4249 dev = sc->vtnet_dev; 4250 ctx = device_get_sysctl_ctx(dev); 4251 tree = device_get_sysctl_tree(dev); 4252 child = SYSCTL_CHILDREN(tree); 4253 4254 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4255 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4256 "Number of maximum supported virtqueue pairs"); 4257 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4258 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4259 "Number of requested virtqueue pairs"); 4260 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4261 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4262 "Number of active virtqueue pairs"); 4263 4264 vtnet_setup_stat_sysctl(ctx, child, sc); 4265 } 4266 4267 static void 4268 vtnet_load_tunables(struct vtnet_softc *sc) 4269 { 4270 4271 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4272 "lro_entry_count", vtnet_lro_entry_count); 4273 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4274 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4275 4276 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4277 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4278 } 4279 4280 static int 4281 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4282 { 4283 4284 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4285 } 4286 4287 static void 4288 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4289 { 4290 4291 virtqueue_disable_intr(rxq->vtnrx_vq); 4292 } 4293 4294 static int 4295 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4296 { 4297 struct virtqueue *vq; 4298 4299 vq = txq->vtntx_vq; 4300 4301 if (vtnet_txq_below_threshold(txq) != 0) 4302 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4303 4304 /* 4305 * The free count is above our threshold. Keep the Tx interrupt 4306 * disabled until the queue is fuller. 4307 */ 4308 return (0); 4309 } 4310 4311 static void 4312 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4313 { 4314 4315 virtqueue_disable_intr(txq->vtntx_vq); 4316 } 4317 4318 static void 4319 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4320 { 4321 struct vtnet_rxq *rxq; 4322 int i; 4323 4324 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4325 rxq = &sc->vtnet_rxqs[i]; 4326 if (vtnet_rxq_enable_intr(rxq) != 0) 4327 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4328 } 4329 } 4330 4331 static void 4332 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4333 { 4334 int i; 4335 4336 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4337 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4338 } 4339 4340 static void 4341 vtnet_enable_interrupts(struct vtnet_softc *sc) 4342 { 4343 4344 vtnet_enable_rx_interrupts(sc); 4345 vtnet_enable_tx_interrupts(sc); 4346 } 4347 4348 static void 4349 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4350 { 4351 int i; 4352 4353 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4354 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4355 } 4356 4357 static void 4358 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4359 { 4360 int i; 4361 4362 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4363 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4364 } 4365 4366 static void 4367 vtnet_disable_interrupts(struct vtnet_softc *sc) 4368 { 4369 4370 vtnet_disable_rx_interrupts(sc); 4371 vtnet_disable_tx_interrupts(sc); 4372 } 4373 4374 static int 4375 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4376 { 4377 char path[64]; 4378 4379 snprintf(path, sizeof(path), 4380 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4381 TUNABLE_INT_FETCH(path, &def); 4382 4383 return (def); 4384 } 4385 4386 #ifdef DEBUGNET 4387 static void 4388 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4389 { 4390 struct vtnet_softc *sc; 4391 4392 sc = if_getsoftc(ifp); 4393 4394 VTNET_CORE_LOCK(sc); 4395 *nrxr = sc->vtnet_req_vq_pairs; 4396 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4397 *clsize = sc->vtnet_rx_clustersz; 4398 VTNET_CORE_UNLOCK(sc); 4399 } 4400 4401 static void 4402 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4403 { 4404 struct vtnet_softc *sc; 4405 static bool sw_lro_enabled = false; 4406 4407 /* 4408 * Disable software LRO, since it would require entering the network 4409 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4410 */ 4411 sc = if_getsoftc(ifp); 4412 switch (event) { 4413 case DEBUGNET_START: 4414 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4415 if (sw_lro_enabled) 4416 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4417 break; 4418 case DEBUGNET_END: 4419 if (sw_lro_enabled) 4420 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4421 break; 4422 } 4423 } 4424 4425 static int 4426 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4427 { 4428 struct vtnet_softc *sc; 4429 struct vtnet_txq *txq; 4430 int error; 4431 4432 sc = if_getsoftc(ifp); 4433 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4434 IFF_DRV_RUNNING) 4435 return (EBUSY); 4436 4437 txq = &sc->vtnet_txqs[0]; 4438 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4439 if (error == 0) 4440 (void)vtnet_txq_notify(txq); 4441 return (error); 4442 } 4443 4444 static int 4445 vtnet_debugnet_poll(if_t ifp, int count) 4446 { 4447 struct vtnet_softc *sc; 4448 int i; 4449 4450 sc = if_getsoftc(ifp); 4451 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4452 IFF_DRV_RUNNING) 4453 return (EBUSY); 4454 4455 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4456 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4457 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4458 return (0); 4459 } 4460 #endif /* DEBUGNET */
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