1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/param.h> 32 #include <sys/eventhandler.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/sockio.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/module.h> 39 #include <sys/msan.h> 40 #include <sys/socket.h> 41 #include <sys/sysctl.h> 42 #include <sys/random.h> 43 #include <sys/sglist.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/taskqueue.h> 47 #include <sys/smp.h> 48 #include <machine/smp.h> 49 50 #include <vm/uma.h> 51 52 #include <net/debugnet.h> 53 #include <net/ethernet.h> 54 #include <net/pfil.h> 55 #include <net/if.h> 56 #include <net/if_var.h> 57 #include <net/if_arp.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/if_media.h> 61 #include <net/if_vlan_var.h> 62 63 #include <net/bpf.h> 64 65 #include <netinet/in_systm.h> 66 #include <netinet/in.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #include <netinet/udp.h> 71 #include <netinet/tcp.h> 72 #include <netinet/tcp_lro.h> 73 74 #include <machine/bus.h> 75 #include <machine/resource.h> 76 #include <sys/bus.h> 77 #include <sys/rman.h> 78 79 #include <dev/virtio/virtio.h> 80 #include <dev/virtio/virtqueue.h> 81 #include <dev/virtio/network/virtio_net.h> 82 #include <dev/virtio/network/if_vtnetvar.h> 83 #include "virtio_if.h" 84 85 #include "opt_inet.h" 86 #include "opt_inet6.h" 87 88 #if defined(INET) || defined(INET6) 89 #include <machine/in_cksum.h> 90 #endif 91 92 #ifdef __NO_STRICT_ALIGNMENT 93 #define VTNET_ETHER_ALIGN 0 94 #else /* Strict alignment */ 95 #define VTNET_ETHER_ALIGN ETHER_ALIGN 96 #endif 97 98 static int vtnet_modevent(module_t, int, void *); 99 100 static int vtnet_probe(device_t); 101 static int vtnet_attach(device_t); 102 static int vtnet_detach(device_t); 103 static int vtnet_suspend(device_t); 104 static int vtnet_resume(device_t); 105 static int vtnet_shutdown(device_t); 106 static int vtnet_attach_completed(device_t); 107 static int vtnet_config_change(device_t); 108 109 static int vtnet_negotiate_features(struct vtnet_softc *); 110 static int vtnet_setup_features(struct vtnet_softc *); 111 static int vtnet_init_rxq(struct vtnet_softc *, int); 112 static int vtnet_init_txq(struct vtnet_softc *, int); 113 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 114 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 115 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 116 static void vtnet_free_rx_filters(struct vtnet_softc *); 117 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 118 static int vtnet_alloc_interface(struct vtnet_softc *); 119 static int vtnet_setup_interface(struct vtnet_softc *); 120 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 121 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 122 static int vtnet_ioctl_multi(struct vtnet_softc *); 123 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 124 static int vtnet_ioctl(if_t, u_long, caddr_t); 125 static uint64_t vtnet_get_counter(if_t, ift_counter); 126 127 static int vtnet_rxq_populate(struct vtnet_rxq *); 128 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 129 static struct mbuf * 130 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 131 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 132 struct mbuf *, int); 133 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 134 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 135 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 136 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 137 uint16_t, int, struct virtio_net_hdr *); 138 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 139 uint16_t, int, struct virtio_net_hdr *); 140 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 141 struct virtio_net_hdr *); 142 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 143 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 144 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 145 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 146 struct virtio_net_hdr *); 147 static int vtnet_rxq_eof(struct vtnet_rxq *); 148 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 149 static void vtnet_rx_vq_intr(void *); 150 static void vtnet_rxq_tq_intr(void *, int); 151 152 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 153 static int vtnet_txq_below_threshold(struct vtnet_txq *); 154 static int vtnet_txq_notify(struct vtnet_txq *); 155 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 156 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 157 int *, int *, int *); 158 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 159 int, struct virtio_net_hdr *); 160 static struct mbuf * 161 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 162 struct virtio_net_hdr *); 163 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 164 struct vtnet_tx_header *); 165 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 166 #ifdef VTNET_LEGACY_TX 167 static void vtnet_start_locked(struct vtnet_txq *, if_t); 168 static void vtnet_start(if_t); 169 #else 170 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 171 static int vtnet_txq_mq_start(if_t, struct mbuf *); 172 static void vtnet_txq_tq_deferred(void *, int); 173 #endif 174 static void vtnet_txq_start(struct vtnet_txq *); 175 static void vtnet_txq_tq_intr(void *, int); 176 static int vtnet_txq_eof(struct vtnet_txq *); 177 static void vtnet_tx_vq_intr(void *); 178 static void vtnet_tx_start_all(struct vtnet_softc *); 179 180 #ifndef VTNET_LEGACY_TX 181 static void vtnet_qflush(if_t); 182 #endif 183 184 static int vtnet_watchdog(struct vtnet_txq *); 185 static void vtnet_accum_stats(struct vtnet_softc *, 186 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 187 static void vtnet_tick(void *); 188 189 static void vtnet_start_taskqueues(struct vtnet_softc *); 190 static void vtnet_free_taskqueues(struct vtnet_softc *); 191 static void vtnet_drain_taskqueues(struct vtnet_softc *); 192 193 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 194 static void vtnet_stop_rendezvous(struct vtnet_softc *); 195 static void vtnet_stop(struct vtnet_softc *); 196 static int vtnet_virtio_reinit(struct vtnet_softc *); 197 static void vtnet_init_rx_filters(struct vtnet_softc *); 198 static int vtnet_init_rx_queues(struct vtnet_softc *); 199 static int vtnet_init_tx_queues(struct vtnet_softc *); 200 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 201 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 202 static void vtnet_update_rx_offloads(struct vtnet_softc *); 203 static int vtnet_reinit(struct vtnet_softc *); 204 static void vtnet_init_locked(struct vtnet_softc *, int); 205 static void vtnet_init(void *); 206 207 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 208 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 209 struct sglist *, int, int); 210 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 211 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 212 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 213 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 214 static int vtnet_set_promisc(struct vtnet_softc *, bool); 215 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 216 static void vtnet_rx_filter(struct vtnet_softc *); 217 static void vtnet_rx_filter_mac(struct vtnet_softc *); 218 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 219 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 220 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 221 static void vtnet_register_vlan(void *, if_t, uint16_t); 222 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 223 224 static void vtnet_update_speed_duplex(struct vtnet_softc *); 225 static int vtnet_is_link_up(struct vtnet_softc *); 226 static void vtnet_update_link_status(struct vtnet_softc *); 227 static int vtnet_ifmedia_upd(if_t); 228 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 229 static void vtnet_get_macaddr(struct vtnet_softc *); 230 static void vtnet_set_macaddr(struct vtnet_softc *); 231 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 232 static void vtnet_vlan_tag_remove(struct mbuf *); 233 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 234 235 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 236 struct sysctl_oid_list *, struct vtnet_rxq *); 237 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 238 struct sysctl_oid_list *, struct vtnet_txq *); 239 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 240 static void vtnet_load_tunables(struct vtnet_softc *); 241 static void vtnet_setup_sysctl(struct vtnet_softc *); 242 243 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 244 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 245 static int vtnet_txq_enable_intr(struct vtnet_txq *); 246 static void vtnet_txq_disable_intr(struct vtnet_txq *); 247 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 248 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 249 static void vtnet_enable_interrupts(struct vtnet_softc *); 250 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 251 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 252 static void vtnet_disable_interrupts(struct vtnet_softc *); 253 254 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 255 256 DEBUGNET_DEFINE(vtnet); 257 258 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 259 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 260 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 261 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 262 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 263 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 264 265 /* Tunables. */ 266 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 267 "VirtIO Net driver parameters"); 268 269 static int vtnet_csum_disable = 0; 270 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 271 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 272 273 static int vtnet_fixup_needs_csum = 0; 274 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 275 &vtnet_fixup_needs_csum, 0, 276 "Calculate valid checksum for NEEDS_CSUM packets"); 277 278 static int vtnet_tso_disable = 0; 279 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 280 &vtnet_tso_disable, 0, "Disables TSO"); 281 282 static int vtnet_lro_disable = 0; 283 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 284 &vtnet_lro_disable, 0, "Disables hardware LRO"); 285 286 static int vtnet_mq_disable = 0; 287 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 288 &vtnet_mq_disable, 0, "Disables multiqueue support"); 289 290 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 291 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 292 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 293 294 static int vtnet_tso_maxlen = IP_MAXPACKET; 295 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 296 &vtnet_tso_maxlen, 0, "TSO burst limit"); 297 298 static int vtnet_rx_process_limit = 1024; 299 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 300 &vtnet_rx_process_limit, 0, 301 "Number of RX segments processed in one pass"); 302 303 static int vtnet_lro_entry_count = 128; 304 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 305 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 306 307 /* Enable sorted LRO, and the depth of the mbuf queue. */ 308 static int vtnet_lro_mbufq_depth = 0; 309 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 310 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 311 312 static uma_zone_t vtnet_tx_header_zone; 313 314 static struct virtio_feature_desc vtnet_feature_desc[] = { 315 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 316 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 317 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 318 { VIRTIO_NET_F_MAC, "MAC" }, 319 { VIRTIO_NET_F_GSO, "TxGSO" }, 320 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 321 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 322 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 323 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 324 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 325 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 326 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 327 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 328 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 329 { VIRTIO_NET_F_STATUS, "Status" }, 330 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 331 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 332 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 333 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 334 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 335 { VIRTIO_NET_F_MQ, "Multiqueue" }, 336 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 337 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 338 339 { 0, NULL } 340 }; 341 342 static device_method_t vtnet_methods[] = { 343 /* Device methods. */ 344 DEVMETHOD(device_probe, vtnet_probe), 345 DEVMETHOD(device_attach, vtnet_attach), 346 DEVMETHOD(device_detach, vtnet_detach), 347 DEVMETHOD(device_suspend, vtnet_suspend), 348 DEVMETHOD(device_resume, vtnet_resume), 349 DEVMETHOD(device_shutdown, vtnet_shutdown), 350 351 /* VirtIO methods. */ 352 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 353 DEVMETHOD(virtio_config_change, vtnet_config_change), 354 355 DEVMETHOD_END 356 }; 357 358 #ifdef DEV_NETMAP 359 #include <dev/netmap/if_vtnet_netmap.h> 360 #endif 361 362 static driver_t vtnet_driver = { 363 .name = "vtnet", 364 .methods = vtnet_methods, 365 .size = sizeof(struct vtnet_softc) 366 }; 367 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 368 MODULE_VERSION(vtnet, 1); 369 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 370 #ifdef DEV_NETMAP 371 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 372 #endif 373 374 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 375 376 static int 377 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 378 { 379 int error = 0; 380 static int loaded = 0; 381 382 switch (type) { 383 case MOD_LOAD: 384 if (loaded++ == 0) { 385 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 386 sizeof(struct vtnet_tx_header), 387 NULL, NULL, NULL, NULL, 0, 0); 388 #ifdef DEBUGNET 389 /* 390 * We need to allocate from this zone in the transmit path, so ensure 391 * that we have at least one item per header available. 392 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 393 * buckets 394 */ 395 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 396 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 397 #endif 398 } 399 break; 400 case MOD_QUIESCE: 401 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 402 error = EBUSY; 403 break; 404 case MOD_UNLOAD: 405 if (--loaded == 0) { 406 uma_zdestroy(vtnet_tx_header_zone); 407 vtnet_tx_header_zone = NULL; 408 } 409 break; 410 case MOD_SHUTDOWN: 411 break; 412 default: 413 error = EOPNOTSUPP; 414 break; 415 } 416 417 return (error); 418 } 419 420 static int 421 vtnet_probe(device_t dev) 422 { 423 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 424 } 425 426 static int 427 vtnet_attach(device_t dev) 428 { 429 struct vtnet_softc *sc; 430 int error; 431 432 sc = device_get_softc(dev); 433 sc->vtnet_dev = dev; 434 virtio_set_feature_desc(dev, vtnet_feature_desc); 435 436 VTNET_CORE_LOCK_INIT(sc); 437 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 438 vtnet_load_tunables(sc); 439 440 error = vtnet_alloc_interface(sc); 441 if (error) { 442 device_printf(dev, "cannot allocate interface\n"); 443 goto fail; 444 } 445 446 vtnet_setup_sysctl(sc); 447 448 error = vtnet_setup_features(sc); 449 if (error) { 450 device_printf(dev, "cannot setup features\n"); 451 goto fail; 452 } 453 454 error = vtnet_alloc_rx_filters(sc); 455 if (error) { 456 device_printf(dev, "cannot allocate Rx filters\n"); 457 goto fail; 458 } 459 460 error = vtnet_alloc_rxtx_queues(sc); 461 if (error) { 462 device_printf(dev, "cannot allocate queues\n"); 463 goto fail; 464 } 465 466 error = vtnet_alloc_virtqueues(sc); 467 if (error) { 468 device_printf(dev, "cannot allocate virtqueues\n"); 469 goto fail; 470 } 471 472 error = vtnet_setup_interface(sc); 473 if (error) { 474 device_printf(dev, "cannot setup interface\n"); 475 goto fail; 476 } 477 478 error = virtio_setup_intr(dev, INTR_TYPE_NET); 479 if (error) { 480 device_printf(dev, "cannot setup interrupts\n"); 481 ether_ifdetach(sc->vtnet_ifp); 482 goto fail; 483 } 484 485 #ifdef DEV_NETMAP 486 vtnet_netmap_attach(sc); 487 #endif 488 vtnet_start_taskqueues(sc); 489 490 fail: 491 if (error) 492 vtnet_detach(dev); 493 494 return (error); 495 } 496 497 static int 498 vtnet_detach(device_t dev) 499 { 500 struct vtnet_softc *sc; 501 if_t ifp; 502 503 sc = device_get_softc(dev); 504 ifp = sc->vtnet_ifp; 505 506 if (device_is_attached(dev)) { 507 VTNET_CORE_LOCK(sc); 508 vtnet_stop(sc); 509 VTNET_CORE_UNLOCK(sc); 510 511 callout_drain(&sc->vtnet_tick_ch); 512 vtnet_drain_taskqueues(sc); 513 514 ether_ifdetach(ifp); 515 } 516 517 #ifdef DEV_NETMAP 518 netmap_detach(ifp); 519 #endif 520 521 if (sc->vtnet_pfil != NULL) { 522 pfil_head_unregister(sc->vtnet_pfil); 523 sc->vtnet_pfil = NULL; 524 } 525 526 vtnet_free_taskqueues(sc); 527 528 if (sc->vtnet_vlan_attach != NULL) { 529 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 530 sc->vtnet_vlan_attach = NULL; 531 } 532 if (sc->vtnet_vlan_detach != NULL) { 533 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 534 sc->vtnet_vlan_detach = NULL; 535 } 536 537 ifmedia_removeall(&sc->vtnet_media); 538 539 if (ifp != NULL) { 540 if_free(ifp); 541 sc->vtnet_ifp = NULL; 542 } 543 544 vtnet_free_rxtx_queues(sc); 545 vtnet_free_rx_filters(sc); 546 547 if (sc->vtnet_ctrl_vq != NULL) 548 vtnet_free_ctrl_vq(sc); 549 550 VTNET_CORE_LOCK_DESTROY(sc); 551 552 return (0); 553 } 554 555 static int 556 vtnet_suspend(device_t dev) 557 { 558 struct vtnet_softc *sc; 559 560 sc = device_get_softc(dev); 561 562 VTNET_CORE_LOCK(sc); 563 vtnet_stop(sc); 564 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 565 VTNET_CORE_UNLOCK(sc); 566 567 return (0); 568 } 569 570 static int 571 vtnet_resume(device_t dev) 572 { 573 struct vtnet_softc *sc; 574 if_t ifp; 575 576 sc = device_get_softc(dev); 577 ifp = sc->vtnet_ifp; 578 579 VTNET_CORE_LOCK(sc); 580 if (if_getflags(ifp) & IFF_UP) 581 vtnet_init_locked(sc, 0); 582 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 583 VTNET_CORE_UNLOCK(sc); 584 585 return (0); 586 } 587 588 static int 589 vtnet_shutdown(device_t dev) 590 { 591 /* 592 * Suspend already does all of what we need to 593 * do here; we just never expect to be resumed. 594 */ 595 return (vtnet_suspend(dev)); 596 } 597 598 static int 599 vtnet_attach_completed(device_t dev) 600 { 601 struct vtnet_softc *sc; 602 603 sc = device_get_softc(dev); 604 605 VTNET_CORE_LOCK(sc); 606 vtnet_attached_set_macaddr(sc); 607 VTNET_CORE_UNLOCK(sc); 608 609 return (0); 610 } 611 612 static int 613 vtnet_config_change(device_t dev) 614 { 615 struct vtnet_softc *sc; 616 617 sc = device_get_softc(dev); 618 619 VTNET_CORE_LOCK(sc); 620 vtnet_update_link_status(sc); 621 if (sc->vtnet_link_active != 0) 622 vtnet_tx_start_all(sc); 623 VTNET_CORE_UNLOCK(sc); 624 625 return (0); 626 } 627 628 static int 629 vtnet_negotiate_features(struct vtnet_softc *sc) 630 { 631 device_t dev; 632 uint64_t features, negotiated_features; 633 int no_csum; 634 635 dev = sc->vtnet_dev; 636 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 637 VTNET_LEGACY_FEATURES; 638 639 /* 640 * TSO and LRO are only available when their corresponding checksum 641 * offload feature is also negotiated. 642 */ 643 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 644 if (no_csum) 645 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 646 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 647 features &= ~VTNET_TSO_FEATURES; 648 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 649 features &= ~VTNET_LRO_FEATURES; 650 651 #ifndef VTNET_LEGACY_TX 652 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 653 features &= ~VIRTIO_NET_F_MQ; 654 #else 655 features &= ~VIRTIO_NET_F_MQ; 656 #endif 657 658 negotiated_features = virtio_negotiate_features(dev, features); 659 660 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 661 uint16_t mtu; 662 663 mtu = virtio_read_dev_config_2(dev, 664 offsetof(struct virtio_net_config, mtu)); 665 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 666 device_printf(dev, "Invalid MTU value: %d. " 667 "MTU feature disabled.\n", mtu); 668 features &= ~VIRTIO_NET_F_MTU; 669 negotiated_features = 670 virtio_negotiate_features(dev, features); 671 } 672 } 673 674 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 675 uint16_t npairs; 676 677 npairs = virtio_read_dev_config_2(dev, 678 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 679 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 680 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 681 device_printf(dev, "Invalid max_virtqueue_pairs value: " 682 "%d. Multiqueue feature disabled.\n", npairs); 683 features &= ~VIRTIO_NET_F_MQ; 684 negotiated_features = 685 virtio_negotiate_features(dev, features); 686 } 687 } 688 689 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 690 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 691 /* 692 * LRO without mergeable buffers requires special care. This 693 * is not ideal because every receive buffer must be large 694 * enough to hold the maximum TCP packet, the Ethernet header, 695 * and the header. This requires up to 34 descriptors with 696 * MCLBYTES clusters. If we do not have indirect descriptors, 697 * LRO is disabled since the virtqueue will not contain very 698 * many receive buffers. 699 */ 700 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 701 device_printf(dev, 702 "Host LRO disabled since both mergeable buffers " 703 "and indirect descriptors were not negotiated\n"); 704 features &= ~VTNET_LRO_FEATURES; 705 negotiated_features = 706 virtio_negotiate_features(dev, features); 707 } else 708 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 709 } 710 711 sc->vtnet_features = negotiated_features; 712 sc->vtnet_negotiated_features = negotiated_features; 713 714 return (virtio_finalize_features(dev)); 715 } 716 717 static int 718 vtnet_setup_features(struct vtnet_softc *sc) 719 { 720 device_t dev; 721 int error; 722 723 dev = sc->vtnet_dev; 724 725 error = vtnet_negotiate_features(sc); 726 if (error) 727 return (error); 728 729 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 730 sc->vtnet_flags |= VTNET_FLAG_MODERN; 731 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 732 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 733 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 734 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 735 736 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 737 /* This feature should always be negotiated. */ 738 sc->vtnet_flags |= VTNET_FLAG_MAC; 739 } 740 741 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 742 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 743 offsetof(struct virtio_net_config, mtu)); 744 } else 745 sc->vtnet_max_mtu = VTNET_MAX_MTU; 746 747 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 748 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 750 } else if (vtnet_modern(sc)) { 751 /* This is identical to the mergeable header. */ 752 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 753 } else 754 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 755 756 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 757 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 758 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 759 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 760 else 761 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 762 763 /* 764 * Favor "hardware" LRO if negotiated, but support software LRO as 765 * a fallback; there is usually little benefit (or worse) with both. 766 */ 767 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 768 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 769 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 770 771 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 772 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 773 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 774 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 775 else 776 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 777 778 sc->vtnet_req_vq_pairs = 1; 779 sc->vtnet_max_vq_pairs = 1; 780 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 782 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 783 784 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 785 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 786 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 787 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 788 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 789 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 790 791 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 792 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 793 offsetof(struct virtio_net_config, 794 max_virtqueue_pairs)); 795 } 796 } 797 798 if (sc->vtnet_max_vq_pairs > 1) { 799 int req; 800 801 /* 802 * Limit the maximum number of requested queue pairs to the 803 * number of CPUs and the configured maximum. 804 */ 805 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 806 if (req < 0) 807 req = 1; 808 if (req == 0) 809 req = mp_ncpus; 810 if (req > sc->vtnet_max_vq_pairs) 811 req = sc->vtnet_max_vq_pairs; 812 if (req > mp_ncpus) 813 req = mp_ncpus; 814 if (req > 1) { 815 sc->vtnet_req_vq_pairs = req; 816 sc->vtnet_flags |= VTNET_FLAG_MQ; 817 } 818 } 819 820 return (0); 821 } 822 823 static int 824 vtnet_init_rxq(struct vtnet_softc *sc, int id) 825 { 826 struct vtnet_rxq *rxq; 827 828 rxq = &sc->vtnet_rxqs[id]; 829 830 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 831 device_get_nameunit(sc->vtnet_dev), id); 832 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 833 834 rxq->vtnrx_sc = sc; 835 rxq->vtnrx_id = id; 836 837 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 838 if (rxq->vtnrx_sg == NULL) 839 return (ENOMEM); 840 841 #if defined(INET) || defined(INET6) 842 if (vtnet_software_lro(sc)) { 843 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 844 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 845 return (ENOMEM); 846 } 847 #endif 848 849 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 850 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 851 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 852 853 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 854 } 855 856 static int 857 vtnet_init_txq(struct vtnet_softc *sc, int id) 858 { 859 struct vtnet_txq *txq; 860 861 txq = &sc->vtnet_txqs[id]; 862 863 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 864 device_get_nameunit(sc->vtnet_dev), id); 865 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 866 867 txq->vtntx_sc = sc; 868 txq->vtntx_id = id; 869 870 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 871 if (txq->vtntx_sg == NULL) 872 return (ENOMEM); 873 874 #ifndef VTNET_LEGACY_TX 875 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 876 M_NOWAIT, &txq->vtntx_mtx); 877 if (txq->vtntx_br == NULL) 878 return (ENOMEM); 879 880 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 881 #endif 882 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 883 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 884 taskqueue_thread_enqueue, &txq->vtntx_tq); 885 if (txq->vtntx_tq == NULL) 886 return (ENOMEM); 887 888 return (0); 889 } 890 891 static int 892 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 893 { 894 int i, npairs, error; 895 896 npairs = sc->vtnet_max_vq_pairs; 897 898 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 899 M_NOWAIT | M_ZERO); 900 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 901 M_NOWAIT | M_ZERO); 902 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 903 return (ENOMEM); 904 905 for (i = 0; i < npairs; i++) { 906 error = vtnet_init_rxq(sc, i); 907 if (error) 908 return (error); 909 error = vtnet_init_txq(sc, i); 910 if (error) 911 return (error); 912 } 913 914 vtnet_set_rx_process_limit(sc); 915 vtnet_setup_queue_sysctl(sc); 916 917 return (0); 918 } 919 920 static void 921 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 922 { 923 924 rxq->vtnrx_sc = NULL; 925 rxq->vtnrx_id = -1; 926 927 #if defined(INET) || defined(INET6) 928 tcp_lro_free(&rxq->vtnrx_lro); 929 #endif 930 931 if (rxq->vtnrx_sg != NULL) { 932 sglist_free(rxq->vtnrx_sg); 933 rxq->vtnrx_sg = NULL; 934 } 935 936 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 937 mtx_destroy(&rxq->vtnrx_mtx); 938 } 939 940 static void 941 vtnet_destroy_txq(struct vtnet_txq *txq) 942 { 943 944 txq->vtntx_sc = NULL; 945 txq->vtntx_id = -1; 946 947 if (txq->vtntx_sg != NULL) { 948 sglist_free(txq->vtntx_sg); 949 txq->vtntx_sg = NULL; 950 } 951 952 #ifndef VTNET_LEGACY_TX 953 if (txq->vtntx_br != NULL) { 954 buf_ring_free(txq->vtntx_br, M_DEVBUF); 955 txq->vtntx_br = NULL; 956 } 957 #endif 958 959 if (mtx_initialized(&txq->vtntx_mtx) != 0) 960 mtx_destroy(&txq->vtntx_mtx); 961 } 962 963 static void 964 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 965 { 966 int i; 967 968 if (sc->vtnet_rxqs != NULL) { 969 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 970 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 971 free(sc->vtnet_rxqs, M_DEVBUF); 972 sc->vtnet_rxqs = NULL; 973 } 974 975 if (sc->vtnet_txqs != NULL) { 976 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 977 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 978 free(sc->vtnet_txqs, M_DEVBUF); 979 sc->vtnet_txqs = NULL; 980 } 981 } 982 983 static int 984 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 985 { 986 987 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 988 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 989 M_DEVBUF, M_NOWAIT | M_ZERO); 990 if (sc->vtnet_mac_filter == NULL) 991 return (ENOMEM); 992 } 993 994 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 995 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 996 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 997 if (sc->vtnet_vlan_filter == NULL) 998 return (ENOMEM); 999 } 1000 1001 return (0); 1002 } 1003 1004 static void 1005 vtnet_free_rx_filters(struct vtnet_softc *sc) 1006 { 1007 1008 if (sc->vtnet_mac_filter != NULL) { 1009 free(sc->vtnet_mac_filter, M_DEVBUF); 1010 sc->vtnet_mac_filter = NULL; 1011 } 1012 1013 if (sc->vtnet_vlan_filter != NULL) { 1014 free(sc->vtnet_vlan_filter, M_DEVBUF); 1015 sc->vtnet_vlan_filter = NULL; 1016 } 1017 } 1018 1019 static int 1020 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1021 { 1022 device_t dev; 1023 struct vq_alloc_info *info; 1024 struct vtnet_rxq *rxq; 1025 struct vtnet_txq *txq; 1026 int i, idx, nvqs, error; 1027 1028 dev = sc->vtnet_dev; 1029 1030 nvqs = sc->vtnet_max_vq_pairs * 2; 1031 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1032 nvqs++; 1033 1034 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1035 if (info == NULL) 1036 return (ENOMEM); 1037 1038 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1039 rxq = &sc->vtnet_rxqs[i]; 1040 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1041 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1042 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1043 1044 txq = &sc->vtnet_txqs[i]; 1045 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1046 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1047 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1048 } 1049 1050 /* These queues will not be used so allocate the minimum resources. */ 1051 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1052 rxq = &sc->vtnet_rxqs[i]; 1053 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1054 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1055 1056 txq = &sc->vtnet_txqs[i]; 1057 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1058 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1059 } 1060 1061 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1062 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1063 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1064 } 1065 1066 error = virtio_alloc_virtqueues(dev, nvqs, info); 1067 free(info, M_TEMP); 1068 1069 return (error); 1070 } 1071 1072 static int 1073 vtnet_alloc_interface(struct vtnet_softc *sc) 1074 { 1075 device_t dev; 1076 if_t ifp; 1077 1078 dev = sc->vtnet_dev; 1079 1080 ifp = if_alloc(IFT_ETHER); 1081 if (ifp == NULL) 1082 return (ENOMEM); 1083 1084 sc->vtnet_ifp = ifp; 1085 if_setsoftc(ifp, sc); 1086 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1087 1088 return (0); 1089 } 1090 1091 static int 1092 vtnet_setup_interface(struct vtnet_softc *sc) 1093 { 1094 device_t dev; 1095 struct pfil_head_args pa; 1096 if_t ifp; 1097 1098 dev = sc->vtnet_dev; 1099 ifp = sc->vtnet_ifp; 1100 1101 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1102 if_setbaudrate(ifp, IF_Gbps(10)); 1103 if_setinitfn(ifp, vtnet_init); 1104 if_setioctlfn(ifp, vtnet_ioctl); 1105 if_setgetcounterfn(ifp, vtnet_get_counter); 1106 #ifndef VTNET_LEGACY_TX 1107 if_settransmitfn(ifp, vtnet_txq_mq_start); 1108 if_setqflushfn(ifp, vtnet_qflush); 1109 #else 1110 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1111 if_setstartfn(ifp, vtnet_start); 1112 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1113 if_setsendqready(ifp); 1114 #endif 1115 1116 vtnet_get_macaddr(sc); 1117 1118 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1119 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1120 1121 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1122 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1123 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1124 1125 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1126 int gso; 1127 1128 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1129 1130 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1131 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1132 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1133 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1134 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1135 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1136 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1137 1138 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1139 int tso_maxlen; 1140 1141 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1142 1143 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1144 vtnet_tso_maxlen); 1145 if_sethwtsomax(ifp, tso_maxlen - 1146 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1147 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1148 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1149 } 1150 } 1151 1152 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1153 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1154 #ifdef notyet 1155 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1156 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1157 #endif 1158 1159 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1160 vtnet_fixup_needs_csum) != 0) 1161 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1162 1163 /* Support either "hardware" or software LRO. */ 1164 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1165 } 1166 1167 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1168 /* 1169 * VirtIO does not support VLAN tagging, but we can fake 1170 * it by inserting and removing the 802.1Q header during 1171 * transmit and receive. We are then able to do checksum 1172 * offloading of VLAN frames. 1173 */ 1174 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1175 } 1176 1177 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1178 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1179 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1180 1181 /* 1182 * Capabilities after here are not enabled by default. 1183 */ 1184 if_setcapenable(ifp, if_getcapabilities(ifp)); 1185 1186 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1187 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1188 1189 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1190 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1191 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1192 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1193 } 1194 1195 ether_ifattach(ifp, sc->vtnet_hwaddr); 1196 1197 /* Tell the upper layer(s) we support long frames. */ 1198 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1199 1200 DEBUGNET_SET(ifp, vtnet); 1201 1202 pa.pa_version = PFIL_VERSION; 1203 pa.pa_flags = PFIL_IN; 1204 pa.pa_type = PFIL_TYPE_ETHERNET; 1205 pa.pa_headname = if_name(ifp); 1206 sc->vtnet_pfil = pfil_head_register(&pa); 1207 1208 return (0); 1209 } 1210 1211 static int 1212 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1213 { 1214 int framesz; 1215 1216 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1217 return (MJUMPAGESIZE); 1218 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1219 return (MCLBYTES); 1220 1221 /* 1222 * Try to scale the receive mbuf cluster size from the MTU. We 1223 * could also use the VQ size to influence the selected size, 1224 * but that would only matter for very small queues. 1225 */ 1226 if (vtnet_modern(sc)) { 1227 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1228 framesz = sizeof(struct virtio_net_hdr_v1); 1229 } else 1230 framesz = sizeof(struct vtnet_rx_header); 1231 framesz += sizeof(struct ether_vlan_header) + mtu; 1232 /* 1233 * Account for the offsetting we'll do elsewhere so we allocate the 1234 * right size for the mtu. 1235 */ 1236 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1237 framesz += VTNET_ETHER_ALIGN; 1238 } 1239 1240 if (framesz <= MCLBYTES) 1241 return (MCLBYTES); 1242 else if (framesz <= MJUMPAGESIZE) 1243 return (MJUMPAGESIZE); 1244 else if (framesz <= MJUM9BYTES) 1245 return (MJUM9BYTES); 1246 1247 /* Sane default; avoid 16KB clusters. */ 1248 return (MCLBYTES); 1249 } 1250 1251 static int 1252 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1253 { 1254 if_t ifp; 1255 int clustersz; 1256 1257 ifp = sc->vtnet_ifp; 1258 VTNET_CORE_LOCK_ASSERT(sc); 1259 1260 if (if_getmtu(ifp) == mtu) 1261 return (0); 1262 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1263 return (EINVAL); 1264 1265 if_setmtu(ifp, mtu); 1266 clustersz = vtnet_rx_cluster_size(sc, mtu); 1267 1268 if (clustersz != sc->vtnet_rx_clustersz && 1269 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1270 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1271 vtnet_init_locked(sc, 0); 1272 } 1273 1274 return (0); 1275 } 1276 1277 static int 1278 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1279 { 1280 if_t ifp; 1281 int drv_running; 1282 1283 ifp = sc->vtnet_ifp; 1284 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1285 1286 VTNET_CORE_LOCK_ASSERT(sc); 1287 1288 if ((if_getflags(ifp) & IFF_UP) == 0) { 1289 if (drv_running) 1290 vtnet_stop(sc); 1291 goto out; 1292 } 1293 1294 if (!drv_running) { 1295 vtnet_init_locked(sc, 0); 1296 goto out; 1297 } 1298 1299 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1300 (IFF_PROMISC | IFF_ALLMULTI)) { 1301 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1302 vtnet_rx_filter(sc); 1303 else { 1304 /* 1305 * We don't support filtering out multicast, so 1306 * ALLMULTI is always set. 1307 */ 1308 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1309 if_setflagbits(ifp, IFF_PROMISC, 0); 1310 } 1311 } 1312 1313 out: 1314 sc->vtnet_if_flags = if_getflags(ifp); 1315 return (0); 1316 } 1317 1318 static int 1319 vtnet_ioctl_multi(struct vtnet_softc *sc) 1320 { 1321 if_t ifp; 1322 1323 ifp = sc->vtnet_ifp; 1324 1325 VTNET_CORE_LOCK_ASSERT(sc); 1326 1327 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1328 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1329 vtnet_rx_filter_mac(sc); 1330 1331 return (0); 1332 } 1333 1334 static int 1335 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1336 { 1337 if_t ifp; 1338 int mask, reinit, update; 1339 1340 ifp = sc->vtnet_ifp; 1341 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1342 reinit = update = 0; 1343 1344 VTNET_CORE_LOCK_ASSERT(sc); 1345 1346 if (mask & IFCAP_TXCSUM) 1347 if_togglecapenable(ifp, IFCAP_TXCSUM); 1348 if (mask & IFCAP_TXCSUM_IPV6) 1349 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1350 if (mask & IFCAP_TSO4) 1351 if_togglecapenable(ifp, IFCAP_TSO4); 1352 if (mask & IFCAP_TSO6) 1353 if_togglecapenable(ifp, IFCAP_TSO6); 1354 1355 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1356 /* 1357 * These Rx features require the negotiated features to 1358 * be updated. Avoid a full reinit if possible. 1359 */ 1360 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1361 update = 1; 1362 else 1363 reinit = 1; 1364 1365 /* BMV: Avoid needless renegotiation for just software LRO. */ 1366 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1367 IFCAP_LRO && vtnet_software_lro(sc)) 1368 reinit = update = 0; 1369 1370 if (mask & IFCAP_RXCSUM) 1371 if_togglecapenable(ifp, IFCAP_RXCSUM); 1372 if (mask & IFCAP_RXCSUM_IPV6) 1373 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1374 if (mask & IFCAP_LRO) 1375 if_togglecapenable(ifp, IFCAP_LRO); 1376 1377 /* 1378 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1379 * so treat them as a pair. Guest TSO (LRO) requires receive 1380 * checksums. 1381 */ 1382 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1383 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1384 #ifdef notyet 1385 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1386 #endif 1387 } else 1388 if_setcapenablebit(ifp, 0, 1389 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1390 } 1391 1392 if (mask & IFCAP_VLAN_HWFILTER) { 1393 /* These Rx features require renegotiation. */ 1394 reinit = 1; 1395 1396 if (mask & IFCAP_VLAN_HWFILTER) 1397 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1398 } 1399 1400 if (mask & IFCAP_VLAN_HWTSO) 1401 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1402 if (mask & IFCAP_VLAN_HWTAGGING) 1403 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1404 1405 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1406 if (reinit) { 1407 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1408 vtnet_init_locked(sc, 0); 1409 } else if (update) 1410 vtnet_update_rx_offloads(sc); 1411 } 1412 1413 return (0); 1414 } 1415 1416 static int 1417 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1418 { 1419 struct vtnet_softc *sc; 1420 struct ifreq *ifr; 1421 int error; 1422 1423 sc = if_getsoftc(ifp); 1424 ifr = (struct ifreq *) data; 1425 error = 0; 1426 1427 switch (cmd) { 1428 case SIOCSIFMTU: 1429 VTNET_CORE_LOCK(sc); 1430 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1431 VTNET_CORE_UNLOCK(sc); 1432 break; 1433 1434 case SIOCSIFFLAGS: 1435 VTNET_CORE_LOCK(sc); 1436 error = vtnet_ioctl_ifflags(sc); 1437 VTNET_CORE_UNLOCK(sc); 1438 break; 1439 1440 case SIOCADDMULTI: 1441 case SIOCDELMULTI: 1442 VTNET_CORE_LOCK(sc); 1443 error = vtnet_ioctl_multi(sc); 1444 VTNET_CORE_UNLOCK(sc); 1445 break; 1446 1447 case SIOCSIFMEDIA: 1448 case SIOCGIFMEDIA: 1449 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1450 break; 1451 1452 case SIOCSIFCAP: 1453 VTNET_CORE_LOCK(sc); 1454 error = vtnet_ioctl_ifcap(sc, ifr); 1455 VTNET_CORE_UNLOCK(sc); 1456 VLAN_CAPABILITIES(ifp); 1457 break; 1458 1459 default: 1460 error = ether_ioctl(ifp, cmd, data); 1461 break; 1462 } 1463 1464 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1465 1466 return (error); 1467 } 1468 1469 static int 1470 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1471 { 1472 struct virtqueue *vq; 1473 int nbufs, error; 1474 1475 #ifdef DEV_NETMAP 1476 error = vtnet_netmap_rxq_populate(rxq); 1477 if (error >= 0) 1478 return (error); 1479 #endif /* DEV_NETMAP */ 1480 1481 vq = rxq->vtnrx_vq; 1482 error = ENOSPC; 1483 1484 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1485 error = vtnet_rxq_new_buf(rxq); 1486 if (error) 1487 break; 1488 } 1489 1490 if (nbufs > 0) { 1491 virtqueue_notify(vq); 1492 /* 1493 * EMSGSIZE signifies the virtqueue did not have enough 1494 * entries available to hold the last mbuf. This is not 1495 * an error. 1496 */ 1497 if (error == EMSGSIZE) 1498 error = 0; 1499 } 1500 1501 return (error); 1502 } 1503 1504 static void 1505 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1506 { 1507 struct virtqueue *vq; 1508 struct mbuf *m; 1509 int last; 1510 #ifdef DEV_NETMAP 1511 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1512 rxq->vtnrx_id, NR_RX); 1513 #else /* !DEV_NETMAP */ 1514 void *kring = NULL; 1515 #endif /* !DEV_NETMAP */ 1516 1517 vq = rxq->vtnrx_vq; 1518 last = 0; 1519 1520 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1521 if (kring == NULL) 1522 m_freem(m); 1523 } 1524 1525 KASSERT(virtqueue_empty(vq), 1526 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1527 } 1528 1529 static struct mbuf * 1530 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1531 { 1532 struct mbuf *m_head, *m_tail, *m; 1533 int i, size; 1534 1535 m_head = NULL; 1536 size = sc->vtnet_rx_clustersz; 1537 1538 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1539 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1540 1541 for (i = 0; i < nbufs; i++) { 1542 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1543 if (m == NULL) { 1544 sc->vtnet_stats.mbuf_alloc_failed++; 1545 m_freem(m_head); 1546 return (NULL); 1547 } 1548 1549 m->m_len = size; 1550 /* 1551 * Need to offset the mbuf if the header we're going to add 1552 * will misalign. 1553 */ 1554 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1555 m_adj(m, VTNET_ETHER_ALIGN); 1556 } 1557 if (m_head != NULL) { 1558 m_tail->m_next = m; 1559 m_tail = m; 1560 } else 1561 m_head = m_tail = m; 1562 } 1563 1564 if (m_tailp != NULL) 1565 *m_tailp = m_tail; 1566 1567 return (m_head); 1568 } 1569 1570 /* 1571 * Slow path for when LRO without mergeable buffers is negotiated. 1572 */ 1573 static int 1574 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1575 int len0) 1576 { 1577 struct vtnet_softc *sc; 1578 struct mbuf *m, *m_prev, *m_new, *m_tail; 1579 int len, clustersz, nreplace, error; 1580 1581 sc = rxq->vtnrx_sc; 1582 clustersz = sc->vtnet_rx_clustersz; 1583 /* 1584 * Need to offset the mbuf if the header we're going to add will 1585 * misalign, account for that here. 1586 */ 1587 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) 1588 clustersz -= VTNET_ETHER_ALIGN; 1589 1590 m_prev = NULL; 1591 m_tail = NULL; 1592 nreplace = 0; 1593 1594 m = m0; 1595 len = len0; 1596 1597 /* 1598 * Since these mbuf chains are so large, avoid allocating a complete 1599 * replacement when the received frame did not consume the entire 1600 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1601 */ 1602 while (len > 0) { 1603 if (m == NULL) { 1604 sc->vtnet_stats.rx_frame_too_large++; 1605 return (EMSGSIZE); 1606 } 1607 1608 /* 1609 * Every mbuf should have the expected cluster size since that 1610 * is also used to allocate the replacements. 1611 */ 1612 KASSERT(m->m_len == clustersz, 1613 ("%s: mbuf size %d not expected cluster size %d", __func__, 1614 m->m_len, clustersz)); 1615 1616 m->m_len = MIN(m->m_len, len); 1617 len -= m->m_len; 1618 1619 m_prev = m; 1620 m = m->m_next; 1621 nreplace++; 1622 } 1623 1624 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1625 ("%s: invalid replacement mbuf count %d max %d", __func__, 1626 nreplace, sc->vtnet_rx_nmbufs)); 1627 1628 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1629 if (m_new == NULL) { 1630 m_prev->m_len = clustersz; 1631 return (ENOBUFS); 1632 } 1633 1634 /* 1635 * Move any unused mbufs from the received mbuf chain onto the 1636 * end of the replacement chain. 1637 */ 1638 if (m_prev->m_next != NULL) { 1639 m_tail->m_next = m_prev->m_next; 1640 m_prev->m_next = NULL; 1641 } 1642 1643 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1644 if (error) { 1645 /* 1646 * The replacement is suppose to be an copy of the one 1647 * dequeued so this is a very unexpected error. 1648 * 1649 * Restore the m0 chain to the original state if it was 1650 * modified so we can then discard it. 1651 */ 1652 if (m_tail->m_next != NULL) { 1653 m_prev->m_next = m_tail->m_next; 1654 m_tail->m_next = NULL; 1655 } 1656 m_prev->m_len = clustersz; 1657 sc->vtnet_stats.rx_enq_replacement_failed++; 1658 m_freem(m_new); 1659 } 1660 1661 return (error); 1662 } 1663 1664 static int 1665 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1666 { 1667 struct vtnet_softc *sc; 1668 struct mbuf *m_new; 1669 int error; 1670 1671 sc = rxq->vtnrx_sc; 1672 1673 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1674 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1675 1676 MPASS(m->m_next == NULL); 1677 if (m->m_len < len) 1678 return (EMSGSIZE); 1679 1680 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1681 if (m_new == NULL) 1682 return (ENOBUFS); 1683 1684 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1685 if (error) { 1686 sc->vtnet_stats.rx_enq_replacement_failed++; 1687 m_freem(m_new); 1688 } else 1689 m->m_len = len; 1690 1691 return (error); 1692 } 1693 1694 static int 1695 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1696 { 1697 struct vtnet_softc *sc; 1698 struct sglist *sg; 1699 int header_inlined, error; 1700 1701 sc = rxq->vtnrx_sc; 1702 sg = rxq->vtnrx_sg; 1703 1704 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1705 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1706 VTNET_RXQ_LOCK_ASSERT(rxq); 1707 1708 sglist_reset(sg); 1709 header_inlined = vtnet_modern(sc) || 1710 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1711 1712 /* 1713 * Note: The mbuf has been already adjusted when we allocate it if we 1714 * have to do strict alignment. 1715 */ 1716 if (header_inlined) 1717 error = sglist_append_mbuf(sg, m); 1718 else { 1719 struct vtnet_rx_header *rxhdr = 1720 mtod(m, struct vtnet_rx_header *); 1721 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1722 1723 /* Append the header and remaining mbuf data. */ 1724 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1725 if (error) 1726 return (error); 1727 error = sglist_append(sg, &rxhdr[1], 1728 m->m_len - sizeof(struct vtnet_rx_header)); 1729 if (error) 1730 return (error); 1731 1732 if (m->m_next != NULL) 1733 error = sglist_append_mbuf(sg, m->m_next); 1734 } 1735 1736 if (error) 1737 return (error); 1738 1739 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1740 } 1741 1742 static int 1743 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1744 { 1745 struct vtnet_softc *sc; 1746 struct mbuf *m; 1747 int error; 1748 1749 sc = rxq->vtnrx_sc; 1750 1751 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1752 if (m == NULL) 1753 return (ENOBUFS); 1754 1755 error = vtnet_rxq_enqueue_buf(rxq, m); 1756 if (error) 1757 m_freem(m); 1758 1759 return (error); 1760 } 1761 1762 static int 1763 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1764 int hoff, struct virtio_net_hdr *hdr) 1765 { 1766 struct vtnet_softc *sc; 1767 int error; 1768 1769 sc = rxq->vtnrx_sc; 1770 1771 /* 1772 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1773 * not have an analogous CSUM flag. The checksum has been validated, 1774 * but is incomplete (TCP/UDP pseudo header). 1775 * 1776 * The packet is likely from another VM on the same host that itself 1777 * performed checksum offloading so Tx/Rx is basically a memcpy and 1778 * the checksum has little value. 1779 * 1780 * Default to receiving the packet as-is for performance reasons, but 1781 * this can cause issues if the packet is to be forwarded because it 1782 * does not contain a valid checksum. This patch may be helpful: 1783 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1784 * compute the checksum if requested. 1785 * 1786 * BMV: Need to add an CSUM_PARTIAL flag? 1787 */ 1788 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1789 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1790 return (error); 1791 } 1792 1793 /* 1794 * Compute the checksum in the driver so the packet will contain a 1795 * valid checksum. The checksum is at csum_offset from csum_start. 1796 */ 1797 switch (etype) { 1798 #if defined(INET) || defined(INET6) 1799 case ETHERTYPE_IP: 1800 case ETHERTYPE_IPV6: { 1801 int csum_off, csum_end; 1802 uint16_t csum; 1803 1804 csum_off = hdr->csum_start + hdr->csum_offset; 1805 csum_end = csum_off + sizeof(uint16_t); 1806 1807 /* Assume checksum will be in the first mbuf. */ 1808 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1809 return (1); 1810 1811 /* 1812 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1813 * checksum and write it at the specified offset. We could 1814 * try to verify the packet: csum_start should probably 1815 * correspond to the start of the TCP/UDP header. 1816 * 1817 * BMV: Need to properly handle UDP with zero checksum. Is 1818 * the IPv4 header checksum implicitly validated? 1819 */ 1820 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1821 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1822 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1823 m->m_pkthdr.csum_data = 0xFFFF; 1824 break; 1825 } 1826 #endif 1827 default: 1828 sc->vtnet_stats.rx_csum_bad_ethtype++; 1829 return (1); 1830 } 1831 1832 return (0); 1833 } 1834 1835 static int 1836 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1837 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1838 { 1839 #if 0 1840 struct vtnet_softc *sc; 1841 #endif 1842 int protocol; 1843 1844 #if 0 1845 sc = rxq->vtnrx_sc; 1846 #endif 1847 1848 switch (etype) { 1849 #if defined(INET) 1850 case ETHERTYPE_IP: 1851 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1852 protocol = IPPROTO_DONE; 1853 else { 1854 struct ip *ip = (struct ip *)(m->m_data + hoff); 1855 protocol = ip->ip_p; 1856 } 1857 break; 1858 #endif 1859 #if defined(INET6) 1860 case ETHERTYPE_IPV6: 1861 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1862 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1863 protocol = IPPROTO_DONE; 1864 break; 1865 #endif 1866 default: 1867 protocol = IPPROTO_DONE; 1868 break; 1869 } 1870 1871 switch (protocol) { 1872 case IPPROTO_TCP: 1873 case IPPROTO_UDP: 1874 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1875 m->m_pkthdr.csum_data = 0xFFFF; 1876 break; 1877 default: 1878 /* 1879 * FreeBSD does not support checksum offloading of this 1880 * protocol. Let the stack re-verify the checksum later 1881 * if the protocol is supported. 1882 */ 1883 #if 0 1884 if_printf(sc->vtnet_ifp, 1885 "%s: checksum offload of unsupported protocol " 1886 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1887 __func__, etype, protocol, hdr->csum_start, 1888 hdr->csum_offset); 1889 #endif 1890 break; 1891 } 1892 1893 return (0); 1894 } 1895 1896 static int 1897 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1898 struct virtio_net_hdr *hdr) 1899 { 1900 const struct ether_header *eh; 1901 int hoff; 1902 uint16_t etype; 1903 1904 eh = mtod(m, const struct ether_header *); 1905 etype = ntohs(eh->ether_type); 1906 if (etype == ETHERTYPE_VLAN) { 1907 /* TODO BMV: Handle QinQ. */ 1908 const struct ether_vlan_header *evh = 1909 mtod(m, const struct ether_vlan_header *); 1910 etype = ntohs(evh->evl_proto); 1911 hoff = sizeof(struct ether_vlan_header); 1912 } else 1913 hoff = sizeof(struct ether_header); 1914 1915 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1916 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1917 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1918 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1919 } 1920 1921 static void 1922 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1923 { 1924 struct mbuf *m; 1925 1926 while (--nbufs > 0) { 1927 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1928 if (m == NULL) 1929 break; 1930 vtnet_rxq_discard_buf(rxq, m); 1931 } 1932 } 1933 1934 static void 1935 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1936 { 1937 int error __diagused; 1938 1939 /* 1940 * Requeue the discarded mbuf. This should always be successful 1941 * since it was just dequeued. 1942 */ 1943 error = vtnet_rxq_enqueue_buf(rxq, m); 1944 KASSERT(error == 0, 1945 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1946 } 1947 1948 static int 1949 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1950 { 1951 struct vtnet_softc *sc; 1952 struct virtqueue *vq; 1953 struct mbuf *m_tail; 1954 1955 sc = rxq->vtnrx_sc; 1956 vq = rxq->vtnrx_vq; 1957 m_tail = m_head; 1958 1959 while (--nbufs > 0) { 1960 struct mbuf *m; 1961 uint32_t len; 1962 1963 m = virtqueue_dequeue(vq, &len); 1964 if (m == NULL) { 1965 rxq->vtnrx_stats.vrxs_ierrors++; 1966 goto fail; 1967 } 1968 1969 if (vtnet_rxq_new_buf(rxq) != 0) { 1970 rxq->vtnrx_stats.vrxs_iqdrops++; 1971 vtnet_rxq_discard_buf(rxq, m); 1972 if (nbufs > 1) 1973 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1974 goto fail; 1975 } 1976 1977 if (m->m_len < len) 1978 len = m->m_len; 1979 1980 m->m_len = len; 1981 m->m_flags &= ~M_PKTHDR; 1982 1983 m_head->m_pkthdr.len += len; 1984 m_tail->m_next = m; 1985 m_tail = m; 1986 } 1987 1988 return (0); 1989 1990 fail: 1991 sc->vtnet_stats.rx_mergeable_failed++; 1992 m_freem(m_head); 1993 1994 return (1); 1995 } 1996 1997 #if defined(INET) || defined(INET6) 1998 static int 1999 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 2000 { 2001 struct lro_ctrl *lro; 2002 2003 lro = &rxq->vtnrx_lro; 2004 2005 if (lro->lro_mbuf_max != 0) { 2006 tcp_lro_queue_mbuf(lro, m); 2007 return (0); 2008 } 2009 2010 return (tcp_lro_rx(lro, m, 0)); 2011 } 2012 #endif 2013 2014 static void 2015 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2016 struct virtio_net_hdr *hdr) 2017 { 2018 struct vtnet_softc *sc; 2019 if_t ifp; 2020 2021 sc = rxq->vtnrx_sc; 2022 ifp = sc->vtnet_ifp; 2023 2024 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2025 struct ether_header *eh = mtod(m, struct ether_header *); 2026 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2027 vtnet_vlan_tag_remove(m); 2028 /* 2029 * With the 802.1Q header removed, update the 2030 * checksum starting location accordingly. 2031 */ 2032 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2033 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2034 } 2035 } 2036 2037 m->m_pkthdr.flowid = rxq->vtnrx_id; 2038 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2039 2040 if (hdr->flags & 2041 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2042 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2043 rxq->vtnrx_stats.vrxs_csum++; 2044 else 2045 rxq->vtnrx_stats.vrxs_csum_failed++; 2046 } 2047 2048 if (hdr->gso_size != 0) { 2049 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2050 case VIRTIO_NET_HDR_GSO_TCPV4: 2051 case VIRTIO_NET_HDR_GSO_TCPV6: 2052 m->m_pkthdr.lro_nsegs = 2053 howmany(m->m_pkthdr.len, hdr->gso_size); 2054 rxq->vtnrx_stats.vrxs_host_lro++; 2055 break; 2056 } 2057 } 2058 2059 rxq->vtnrx_stats.vrxs_ipackets++; 2060 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2061 2062 #if defined(INET) || defined(INET6) 2063 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2064 if (vtnet_lro_rx(rxq, m) == 0) 2065 return; 2066 } 2067 #endif 2068 2069 if_input(ifp, m); 2070 } 2071 2072 static int 2073 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2074 { 2075 struct virtio_net_hdr lhdr, *hdr; 2076 struct vtnet_softc *sc; 2077 if_t ifp; 2078 struct virtqueue *vq; 2079 int deq, count; 2080 2081 sc = rxq->vtnrx_sc; 2082 vq = rxq->vtnrx_vq; 2083 ifp = sc->vtnet_ifp; 2084 deq = 0; 2085 count = sc->vtnet_rx_process_limit; 2086 2087 VTNET_RXQ_LOCK_ASSERT(rxq); 2088 2089 while (count-- > 0) { 2090 struct mbuf *m; 2091 uint32_t len, nbufs, adjsz; 2092 2093 m = virtqueue_dequeue(vq, &len); 2094 if (m == NULL) 2095 break; 2096 deq++; 2097 2098 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2099 rxq->vtnrx_stats.vrxs_ierrors++; 2100 vtnet_rxq_discard_buf(rxq, m); 2101 continue; 2102 } 2103 2104 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2105 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2106 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2107 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2108 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2109 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2110 } else if (vtnet_modern(sc)) { 2111 nbufs = 1; /* num_buffers is always 1 */ 2112 adjsz = sizeof(struct virtio_net_hdr_v1); 2113 } else { 2114 nbufs = 1; 2115 adjsz = sizeof(struct vtnet_rx_header); 2116 /* 2117 * Account for our gap between the header and start of 2118 * data to keep the segments separated. 2119 */ 2120 len += VTNET_RX_HEADER_PAD; 2121 } 2122 2123 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2124 rxq->vtnrx_stats.vrxs_iqdrops++; 2125 vtnet_rxq_discard_buf(rxq, m); 2126 if (nbufs > 1) 2127 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2128 continue; 2129 } 2130 2131 m->m_pkthdr.len = len; 2132 m->m_pkthdr.rcvif = ifp; 2133 m->m_pkthdr.csum_flags = 0; 2134 2135 if (nbufs > 1) { 2136 /* Dequeue the rest of chain. */ 2137 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2138 continue; 2139 } 2140 2141 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2142 2143 /* 2144 * Save an endian swapped version of the header prior to it 2145 * being stripped. The header is always at the start of the 2146 * mbuf data. num_buffers was already saved (and not needed) 2147 * so use the standard header. 2148 */ 2149 hdr = mtod(m, struct virtio_net_hdr *); 2150 lhdr.flags = hdr->flags; 2151 lhdr.gso_type = hdr->gso_type; 2152 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2153 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2154 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2155 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2156 m_adj(m, adjsz); 2157 2158 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2159 pfil_return_t pfil; 2160 2161 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2162 switch (pfil) { 2163 case PFIL_DROPPED: 2164 case PFIL_CONSUMED: 2165 continue; 2166 default: 2167 KASSERT(pfil == PFIL_PASS, 2168 ("Filter returned %d!", pfil)); 2169 } 2170 } 2171 2172 vtnet_rxq_input(rxq, m, &lhdr); 2173 } 2174 2175 if (deq > 0) { 2176 #if defined(INET) || defined(INET6) 2177 if (vtnet_software_lro(sc)) 2178 tcp_lro_flush_all(&rxq->vtnrx_lro); 2179 #endif 2180 virtqueue_notify(vq); 2181 } 2182 2183 return (count > 0 ? 0 : EAGAIN); 2184 } 2185 2186 static void 2187 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2188 { 2189 struct vtnet_softc *sc; 2190 if_t ifp; 2191 u_int more; 2192 #ifdef DEV_NETMAP 2193 int nmirq; 2194 #endif /* DEV_NETMAP */ 2195 2196 sc = rxq->vtnrx_sc; 2197 ifp = sc->vtnet_ifp; 2198 2199 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2200 /* 2201 * Ignore this interrupt. Either this is a spurious interrupt 2202 * or multiqueue without per-VQ MSIX so every queue needs to 2203 * be polled (a brain dead configuration we could try harder 2204 * to avoid). 2205 */ 2206 vtnet_rxq_disable_intr(rxq); 2207 return; 2208 } 2209 2210 VTNET_RXQ_LOCK(rxq); 2211 2212 #ifdef DEV_NETMAP 2213 /* 2214 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2215 * This is not necessary to serialize the access to the RX vq, but 2216 * rather to avoid races that may happen if this interface is 2217 * attached to a VALE switch, which would cause received packets 2218 * to stall in the RX queue (nm_kr_tryget() could find the kring 2219 * busy when called from netmap_bwrap_intr_notify()). 2220 */ 2221 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2222 if (nmirq != NM_IRQ_PASS) { 2223 VTNET_RXQ_UNLOCK(rxq); 2224 if (nmirq == NM_IRQ_RESCHED) { 2225 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2226 } 2227 return; 2228 } 2229 #endif /* DEV_NETMAP */ 2230 2231 again: 2232 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2233 VTNET_RXQ_UNLOCK(rxq); 2234 return; 2235 } 2236 2237 more = vtnet_rxq_eof(rxq); 2238 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2239 if (!more) 2240 vtnet_rxq_disable_intr(rxq); 2241 /* 2242 * This is an occasional condition or race (when !more), 2243 * so retry a few times before scheduling the taskqueue. 2244 */ 2245 if (tries-- > 0) 2246 goto again; 2247 2248 rxq->vtnrx_stats.vrxs_rescheduled++; 2249 VTNET_RXQ_UNLOCK(rxq); 2250 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2251 } else 2252 VTNET_RXQ_UNLOCK(rxq); 2253 } 2254 2255 static void 2256 vtnet_rx_vq_intr(void *xrxq) 2257 { 2258 struct vtnet_rxq *rxq; 2259 2260 rxq = xrxq; 2261 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2262 } 2263 2264 static void 2265 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2266 { 2267 struct vtnet_rxq *rxq; 2268 2269 rxq = xrxq; 2270 vtnet_rx_vq_process(rxq, 0); 2271 } 2272 2273 static int 2274 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2275 { 2276 struct vtnet_softc *sc; 2277 int threshold; 2278 2279 sc = txq->vtntx_sc; 2280 2281 /* 2282 * The Tx interrupt is disabled until the queue free count falls 2283 * below our threshold. Completed frames are drained from the Tx 2284 * virtqueue before transmitting new frames and in the watchdog 2285 * callout, so the frequency of Tx interrupts is greatly reduced, 2286 * at the cost of not freeing mbufs as quickly as they otherwise 2287 * would be. 2288 */ 2289 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2290 2291 /* 2292 * Without indirect descriptors, leave enough room for the most 2293 * segments we handle. 2294 */ 2295 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2296 threshold < sc->vtnet_tx_nsegs) 2297 threshold = sc->vtnet_tx_nsegs; 2298 2299 return (threshold); 2300 } 2301 2302 static int 2303 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2304 { 2305 struct virtqueue *vq; 2306 2307 vq = txq->vtntx_vq; 2308 2309 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2310 } 2311 2312 static int 2313 vtnet_txq_notify(struct vtnet_txq *txq) 2314 { 2315 struct virtqueue *vq; 2316 2317 vq = txq->vtntx_vq; 2318 2319 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2320 virtqueue_notify(vq); 2321 2322 if (vtnet_txq_enable_intr(txq) == 0) 2323 return (0); 2324 2325 /* 2326 * Drain frames that were completed since last checked. If this 2327 * causes the queue to go above the threshold, the caller should 2328 * continue transmitting. 2329 */ 2330 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2331 virtqueue_disable_intr(vq); 2332 return (1); 2333 } 2334 2335 return (0); 2336 } 2337 2338 static void 2339 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2340 { 2341 struct virtqueue *vq; 2342 struct vtnet_tx_header *txhdr; 2343 int last; 2344 #ifdef DEV_NETMAP 2345 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2346 txq->vtntx_id, NR_TX); 2347 #else /* !DEV_NETMAP */ 2348 void *kring = NULL; 2349 #endif /* !DEV_NETMAP */ 2350 2351 vq = txq->vtntx_vq; 2352 last = 0; 2353 2354 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2355 if (kring == NULL) { 2356 m_freem(txhdr->vth_mbuf); 2357 uma_zfree(vtnet_tx_header_zone, txhdr); 2358 } 2359 } 2360 2361 KASSERT(virtqueue_empty(vq), 2362 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2363 } 2364 2365 /* 2366 * BMV: This can go away once we finally have offsets in the mbuf header. 2367 */ 2368 static int 2369 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2370 int *proto, int *start) 2371 { 2372 struct vtnet_softc *sc; 2373 struct ether_vlan_header *evh; 2374 #if defined(INET) || defined(INET6) 2375 int offset; 2376 #endif 2377 2378 sc = txq->vtntx_sc; 2379 2380 evh = mtod(m, struct ether_vlan_header *); 2381 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2382 /* BMV: We should handle nested VLAN tags too. */ 2383 *etype = ntohs(evh->evl_proto); 2384 #if defined(INET) || defined(INET6) 2385 offset = sizeof(struct ether_vlan_header); 2386 #endif 2387 } else { 2388 *etype = ntohs(evh->evl_encap_proto); 2389 #if defined(INET) || defined(INET6) 2390 offset = sizeof(struct ether_header); 2391 #endif 2392 } 2393 2394 switch (*etype) { 2395 #if defined(INET) 2396 case ETHERTYPE_IP: { 2397 struct ip *ip, iphdr; 2398 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2399 m_copydata(m, offset, sizeof(struct ip), 2400 (caddr_t) &iphdr); 2401 ip = &iphdr; 2402 } else 2403 ip = (struct ip *)(m->m_data + offset); 2404 *proto = ip->ip_p; 2405 *start = offset + (ip->ip_hl << 2); 2406 break; 2407 } 2408 #endif 2409 #if defined(INET6) 2410 case ETHERTYPE_IPV6: 2411 *proto = -1; 2412 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2413 /* Assert the network stack sent us a valid packet. */ 2414 KASSERT(*start > offset, 2415 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2416 *start, offset, *proto)); 2417 break; 2418 #endif 2419 default: 2420 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2421 return (EINVAL); 2422 } 2423 2424 return (0); 2425 } 2426 2427 static int 2428 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2429 int offset, struct virtio_net_hdr *hdr) 2430 { 2431 static struct timeval lastecn; 2432 static int curecn; 2433 struct vtnet_softc *sc; 2434 struct tcphdr *tcp, tcphdr; 2435 2436 sc = txq->vtntx_sc; 2437 2438 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2439 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2440 tcp = &tcphdr; 2441 } else 2442 tcp = (struct tcphdr *)(m->m_data + offset); 2443 2444 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2445 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2446 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2447 VIRTIO_NET_HDR_GSO_TCPV6; 2448 2449 if (__predict_false(tcp->th_flags & TH_CWR)) { 2450 /* 2451 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2452 * FreeBSD, ECN support is not on a per-interface basis, 2453 * but globally via the net.inet.tcp.ecn.enable sysctl 2454 * knob. The default is off. 2455 */ 2456 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2457 if (ppsratecheck(&lastecn, &curecn, 1)) 2458 if_printf(sc->vtnet_ifp, 2459 "TSO with ECN not negotiated with host\n"); 2460 return (ENOTSUP); 2461 } 2462 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2463 } 2464 2465 txq->vtntx_stats.vtxs_tso++; 2466 2467 return (0); 2468 } 2469 2470 static struct mbuf * 2471 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2472 struct virtio_net_hdr *hdr) 2473 { 2474 struct vtnet_softc *sc; 2475 int flags, etype, csum_start, proto, error; 2476 2477 sc = txq->vtntx_sc; 2478 flags = m->m_pkthdr.csum_flags; 2479 2480 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2481 if (error) 2482 goto drop; 2483 2484 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2485 /* Sanity check the parsed mbuf matches the offload flags. */ 2486 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2487 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2488 && etype != ETHERTYPE_IPV6))) { 2489 sc->vtnet_stats.tx_csum_proto_mismatch++; 2490 goto drop; 2491 } 2492 2493 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2494 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2495 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2496 txq->vtntx_stats.vtxs_csum++; 2497 } 2498 2499 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2500 /* 2501 * Sanity check the parsed mbuf IP protocol is TCP, and 2502 * VirtIO TSO reqires the checksum offloading above. 2503 */ 2504 if (__predict_false(proto != IPPROTO_TCP)) { 2505 sc->vtnet_stats.tx_tso_not_tcp++; 2506 goto drop; 2507 } else if (__predict_false((hdr->flags & 2508 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2509 sc->vtnet_stats.tx_tso_without_csum++; 2510 goto drop; 2511 } 2512 2513 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2514 if (error) 2515 goto drop; 2516 } 2517 2518 return (m); 2519 2520 drop: 2521 m_freem(m); 2522 return (NULL); 2523 } 2524 2525 static int 2526 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2527 struct vtnet_tx_header *txhdr) 2528 { 2529 struct vtnet_softc *sc; 2530 struct virtqueue *vq; 2531 struct sglist *sg; 2532 struct mbuf *m; 2533 int error; 2534 2535 sc = txq->vtntx_sc; 2536 vq = txq->vtntx_vq; 2537 sg = txq->vtntx_sg; 2538 m = *m_head; 2539 2540 sglist_reset(sg); 2541 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2542 if (error != 0 || sg->sg_nseg != 1) { 2543 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2544 __func__, error, sg->sg_nseg)); 2545 goto fail; 2546 } 2547 2548 error = sglist_append_mbuf(sg, m); 2549 if (error) { 2550 m = m_defrag(m, M_NOWAIT); 2551 if (m == NULL) 2552 goto fail; 2553 2554 *m_head = m; 2555 sc->vtnet_stats.tx_defragged++; 2556 2557 error = sglist_append_mbuf(sg, m); 2558 if (error) 2559 goto fail; 2560 } 2561 2562 txhdr->vth_mbuf = m; 2563 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2564 2565 return (error); 2566 2567 fail: 2568 sc->vtnet_stats.tx_defrag_failed++; 2569 m_freem(*m_head); 2570 *m_head = NULL; 2571 2572 return (ENOBUFS); 2573 } 2574 2575 static int 2576 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2577 { 2578 struct vtnet_tx_header *txhdr; 2579 struct virtio_net_hdr *hdr; 2580 struct mbuf *m; 2581 int error; 2582 2583 m = *m_head; 2584 M_ASSERTPKTHDR(m); 2585 2586 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2587 if (txhdr == NULL) { 2588 m_freem(m); 2589 *m_head = NULL; 2590 return (ENOMEM); 2591 } 2592 2593 /* 2594 * Always use the non-mergeable header, regardless if mergable headers 2595 * were negotiated, because for transmit num_buffers is always zero. 2596 * The vtnet_hdr_size is used to enqueue the right header size segment. 2597 */ 2598 hdr = &txhdr->vth_uhdr.hdr; 2599 2600 if (m->m_flags & M_VLANTAG) { 2601 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2602 if ((*m_head = m) == NULL) { 2603 error = ENOBUFS; 2604 goto fail; 2605 } 2606 m->m_flags &= ~M_VLANTAG; 2607 } 2608 2609 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2610 m = vtnet_txq_offload(txq, m, hdr); 2611 if ((*m_head = m) == NULL) { 2612 error = ENOBUFS; 2613 goto fail; 2614 } 2615 } 2616 2617 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2618 fail: 2619 if (error) 2620 uma_zfree(vtnet_tx_header_zone, txhdr); 2621 2622 return (error); 2623 } 2624 2625 #ifdef VTNET_LEGACY_TX 2626 2627 static void 2628 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2629 { 2630 struct vtnet_softc *sc; 2631 struct virtqueue *vq; 2632 struct mbuf *m0; 2633 int tries, enq; 2634 2635 sc = txq->vtntx_sc; 2636 vq = txq->vtntx_vq; 2637 tries = 0; 2638 2639 VTNET_TXQ_LOCK_ASSERT(txq); 2640 2641 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2642 sc->vtnet_link_active == 0) 2643 return; 2644 2645 vtnet_txq_eof(txq); 2646 2647 again: 2648 enq = 0; 2649 2650 while (!if_sendq_empty(ifp)) { 2651 if (virtqueue_full(vq)) 2652 break; 2653 2654 m0 = if_dequeue(ifp); 2655 if (m0 == NULL) 2656 break; 2657 2658 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2659 if (m0 != NULL) 2660 if_sendq_prepend(ifp, m0); 2661 break; 2662 } 2663 2664 enq++; 2665 ETHER_BPF_MTAP(ifp, m0); 2666 } 2667 2668 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2669 if (tries++ < VTNET_NOTIFY_RETRIES) 2670 goto again; 2671 2672 txq->vtntx_stats.vtxs_rescheduled++; 2673 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2674 } 2675 } 2676 2677 static void 2678 vtnet_start(if_t ifp) 2679 { 2680 struct vtnet_softc *sc; 2681 struct vtnet_txq *txq; 2682 2683 sc = if_getsoftc(ifp); 2684 txq = &sc->vtnet_txqs[0]; 2685 2686 VTNET_TXQ_LOCK(txq); 2687 vtnet_start_locked(txq, ifp); 2688 VTNET_TXQ_UNLOCK(txq); 2689 } 2690 2691 #else /* !VTNET_LEGACY_TX */ 2692 2693 static int 2694 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2695 { 2696 struct vtnet_softc *sc; 2697 struct virtqueue *vq; 2698 struct buf_ring *br; 2699 if_t ifp; 2700 int enq, tries, error; 2701 2702 sc = txq->vtntx_sc; 2703 vq = txq->vtntx_vq; 2704 br = txq->vtntx_br; 2705 ifp = sc->vtnet_ifp; 2706 tries = 0; 2707 error = 0; 2708 2709 VTNET_TXQ_LOCK_ASSERT(txq); 2710 2711 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2712 sc->vtnet_link_active == 0) { 2713 if (m != NULL) 2714 error = drbr_enqueue(ifp, br, m); 2715 return (error); 2716 } 2717 2718 if (m != NULL) { 2719 error = drbr_enqueue(ifp, br, m); 2720 if (error) 2721 return (error); 2722 } 2723 2724 vtnet_txq_eof(txq); 2725 2726 again: 2727 enq = 0; 2728 2729 while ((m = drbr_peek(ifp, br)) != NULL) { 2730 if (virtqueue_full(vq)) { 2731 drbr_putback(ifp, br, m); 2732 break; 2733 } 2734 2735 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2736 if (m != NULL) 2737 drbr_putback(ifp, br, m); 2738 else 2739 drbr_advance(ifp, br); 2740 break; 2741 } 2742 drbr_advance(ifp, br); 2743 2744 enq++; 2745 ETHER_BPF_MTAP(ifp, m); 2746 } 2747 2748 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2749 if (tries++ < VTNET_NOTIFY_RETRIES) 2750 goto again; 2751 2752 txq->vtntx_stats.vtxs_rescheduled++; 2753 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2754 } 2755 2756 return (0); 2757 } 2758 2759 static int 2760 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2761 { 2762 struct vtnet_softc *sc; 2763 struct vtnet_txq *txq; 2764 int i, npairs, error; 2765 2766 sc = if_getsoftc(ifp); 2767 npairs = sc->vtnet_act_vq_pairs; 2768 2769 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2770 i = m->m_pkthdr.flowid % npairs; 2771 else 2772 i = curcpu % npairs; 2773 2774 txq = &sc->vtnet_txqs[i]; 2775 2776 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2777 error = vtnet_txq_mq_start_locked(txq, m); 2778 VTNET_TXQ_UNLOCK(txq); 2779 } else { 2780 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2781 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2782 } 2783 2784 return (error); 2785 } 2786 2787 static void 2788 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2789 { 2790 struct vtnet_softc *sc; 2791 struct vtnet_txq *txq; 2792 2793 txq = xtxq; 2794 sc = txq->vtntx_sc; 2795 2796 VTNET_TXQ_LOCK(txq); 2797 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2798 vtnet_txq_mq_start_locked(txq, NULL); 2799 VTNET_TXQ_UNLOCK(txq); 2800 } 2801 2802 #endif /* VTNET_LEGACY_TX */ 2803 2804 static void 2805 vtnet_txq_start(struct vtnet_txq *txq) 2806 { 2807 struct vtnet_softc *sc; 2808 if_t ifp; 2809 2810 sc = txq->vtntx_sc; 2811 ifp = sc->vtnet_ifp; 2812 2813 #ifdef VTNET_LEGACY_TX 2814 if (!if_sendq_empty(ifp)) 2815 vtnet_start_locked(txq, ifp); 2816 #else 2817 if (!drbr_empty(ifp, txq->vtntx_br)) 2818 vtnet_txq_mq_start_locked(txq, NULL); 2819 #endif 2820 } 2821 2822 static void 2823 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2824 { 2825 struct vtnet_softc *sc; 2826 struct vtnet_txq *txq; 2827 if_t ifp; 2828 2829 txq = xtxq; 2830 sc = txq->vtntx_sc; 2831 ifp = sc->vtnet_ifp; 2832 2833 VTNET_TXQ_LOCK(txq); 2834 2835 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2836 VTNET_TXQ_UNLOCK(txq); 2837 return; 2838 } 2839 2840 vtnet_txq_eof(txq); 2841 vtnet_txq_start(txq); 2842 2843 VTNET_TXQ_UNLOCK(txq); 2844 } 2845 2846 static int 2847 vtnet_txq_eof(struct vtnet_txq *txq) 2848 { 2849 struct virtqueue *vq; 2850 struct vtnet_tx_header *txhdr; 2851 struct mbuf *m; 2852 int deq; 2853 2854 vq = txq->vtntx_vq; 2855 deq = 0; 2856 VTNET_TXQ_LOCK_ASSERT(txq); 2857 2858 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2859 m = txhdr->vth_mbuf; 2860 deq++; 2861 2862 txq->vtntx_stats.vtxs_opackets++; 2863 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2864 if (m->m_flags & M_MCAST) 2865 txq->vtntx_stats.vtxs_omcasts++; 2866 2867 m_freem(m); 2868 uma_zfree(vtnet_tx_header_zone, txhdr); 2869 } 2870 2871 if (virtqueue_empty(vq)) 2872 txq->vtntx_watchdog = 0; 2873 2874 return (deq); 2875 } 2876 2877 static void 2878 vtnet_tx_vq_intr(void *xtxq) 2879 { 2880 struct vtnet_softc *sc; 2881 struct vtnet_txq *txq; 2882 if_t ifp; 2883 2884 txq = xtxq; 2885 sc = txq->vtntx_sc; 2886 ifp = sc->vtnet_ifp; 2887 2888 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2889 /* 2890 * Ignore this interrupt. Either this is a spurious interrupt 2891 * or multiqueue without per-VQ MSIX so every queue needs to 2892 * be polled (a brain dead configuration we could try harder 2893 * to avoid). 2894 */ 2895 vtnet_txq_disable_intr(txq); 2896 return; 2897 } 2898 2899 #ifdef DEV_NETMAP 2900 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2901 return; 2902 #endif /* DEV_NETMAP */ 2903 2904 VTNET_TXQ_LOCK(txq); 2905 2906 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2907 VTNET_TXQ_UNLOCK(txq); 2908 return; 2909 } 2910 2911 vtnet_txq_eof(txq); 2912 vtnet_txq_start(txq); 2913 2914 VTNET_TXQ_UNLOCK(txq); 2915 } 2916 2917 static void 2918 vtnet_tx_start_all(struct vtnet_softc *sc) 2919 { 2920 struct vtnet_txq *txq; 2921 int i; 2922 2923 VTNET_CORE_LOCK_ASSERT(sc); 2924 2925 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2926 txq = &sc->vtnet_txqs[i]; 2927 2928 VTNET_TXQ_LOCK(txq); 2929 vtnet_txq_start(txq); 2930 VTNET_TXQ_UNLOCK(txq); 2931 } 2932 } 2933 2934 #ifndef VTNET_LEGACY_TX 2935 static void 2936 vtnet_qflush(if_t ifp) 2937 { 2938 struct vtnet_softc *sc; 2939 struct vtnet_txq *txq; 2940 struct mbuf *m; 2941 int i; 2942 2943 sc = if_getsoftc(ifp); 2944 2945 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2946 txq = &sc->vtnet_txqs[i]; 2947 2948 VTNET_TXQ_LOCK(txq); 2949 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2950 m_freem(m); 2951 VTNET_TXQ_UNLOCK(txq); 2952 } 2953 2954 if_qflush(ifp); 2955 } 2956 #endif 2957 2958 static int 2959 vtnet_watchdog(struct vtnet_txq *txq) 2960 { 2961 if_t ifp; 2962 2963 ifp = txq->vtntx_sc->vtnet_ifp; 2964 2965 VTNET_TXQ_LOCK(txq); 2966 if (txq->vtntx_watchdog == 1) { 2967 /* 2968 * Only drain completed frames if the watchdog is about to 2969 * expire. If any frames were drained, there may be enough 2970 * free descriptors now available to transmit queued frames. 2971 * In that case, the timer will immediately be decremented 2972 * below, but the timeout is generous enough that should not 2973 * be a problem. 2974 */ 2975 if (vtnet_txq_eof(txq) != 0) 2976 vtnet_txq_start(txq); 2977 } 2978 2979 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2980 VTNET_TXQ_UNLOCK(txq); 2981 return (0); 2982 } 2983 VTNET_TXQ_UNLOCK(txq); 2984 2985 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2986 return (1); 2987 } 2988 2989 static void 2990 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2991 struct vtnet_txq_stats *txacc) 2992 { 2993 2994 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2995 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2996 2997 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 2998 struct vtnet_rxq_stats *rxst; 2999 struct vtnet_txq_stats *txst; 3000 3001 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 3002 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 3003 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 3004 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 3005 rxacc->vrxs_csum += rxst->vrxs_csum; 3006 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 3007 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 3008 3009 txst = &sc->vtnet_txqs[i].vtntx_stats; 3010 txacc->vtxs_opackets += txst->vtxs_opackets; 3011 txacc->vtxs_obytes += txst->vtxs_obytes; 3012 txacc->vtxs_csum += txst->vtxs_csum; 3013 txacc->vtxs_tso += txst->vtxs_tso; 3014 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 3015 } 3016 } 3017 3018 static uint64_t 3019 vtnet_get_counter(if_t ifp, ift_counter cnt) 3020 { 3021 struct vtnet_softc *sc; 3022 struct vtnet_rxq_stats rxaccum; 3023 struct vtnet_txq_stats txaccum; 3024 3025 sc = if_getsoftc(ifp); 3026 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3027 3028 switch (cnt) { 3029 case IFCOUNTER_IPACKETS: 3030 return (rxaccum.vrxs_ipackets); 3031 case IFCOUNTER_IQDROPS: 3032 return (rxaccum.vrxs_iqdrops); 3033 case IFCOUNTER_IERRORS: 3034 return (rxaccum.vrxs_ierrors); 3035 case IFCOUNTER_OPACKETS: 3036 return (txaccum.vtxs_opackets); 3037 #ifndef VTNET_LEGACY_TX 3038 case IFCOUNTER_OBYTES: 3039 return (txaccum.vtxs_obytes); 3040 case IFCOUNTER_OMCASTS: 3041 return (txaccum.vtxs_omcasts); 3042 #endif 3043 default: 3044 return (if_get_counter_default(ifp, cnt)); 3045 } 3046 } 3047 3048 static void 3049 vtnet_tick(void *xsc) 3050 { 3051 struct vtnet_softc *sc; 3052 if_t ifp; 3053 int i, timedout; 3054 3055 sc = xsc; 3056 ifp = sc->vtnet_ifp; 3057 timedout = 0; 3058 3059 VTNET_CORE_LOCK_ASSERT(sc); 3060 3061 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3062 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3063 3064 if (timedout != 0) { 3065 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3066 vtnet_init_locked(sc, 0); 3067 } else 3068 callout_schedule(&sc->vtnet_tick_ch, hz); 3069 } 3070 3071 static void 3072 vtnet_start_taskqueues(struct vtnet_softc *sc) 3073 { 3074 device_t dev; 3075 struct vtnet_rxq *rxq; 3076 struct vtnet_txq *txq; 3077 int i, error; 3078 3079 dev = sc->vtnet_dev; 3080 3081 /* 3082 * Errors here are very difficult to recover from - we cannot 3083 * easily fail because, if this is during boot, we will hang 3084 * when freeing any successfully started taskqueues because 3085 * the scheduler isn't up yet. 3086 * 3087 * Most drivers just ignore the return value - it only fails 3088 * with ENOMEM so an error is not likely. 3089 */ 3090 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3091 rxq = &sc->vtnet_rxqs[i]; 3092 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3093 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3094 if (error) { 3095 device_printf(dev, "failed to start rx taskq %d\n", 3096 rxq->vtnrx_id); 3097 } 3098 3099 txq = &sc->vtnet_txqs[i]; 3100 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3101 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3102 if (error) { 3103 device_printf(dev, "failed to start tx taskq %d\n", 3104 txq->vtntx_id); 3105 } 3106 } 3107 } 3108 3109 static void 3110 vtnet_free_taskqueues(struct vtnet_softc *sc) 3111 { 3112 struct vtnet_rxq *rxq; 3113 struct vtnet_txq *txq; 3114 int i; 3115 3116 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3117 rxq = &sc->vtnet_rxqs[i]; 3118 if (rxq->vtnrx_tq != NULL) { 3119 taskqueue_free(rxq->vtnrx_tq); 3120 rxq->vtnrx_tq = NULL; 3121 } 3122 3123 txq = &sc->vtnet_txqs[i]; 3124 if (txq->vtntx_tq != NULL) { 3125 taskqueue_free(txq->vtntx_tq); 3126 txq->vtntx_tq = NULL; 3127 } 3128 } 3129 } 3130 3131 static void 3132 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3133 { 3134 struct vtnet_rxq *rxq; 3135 struct vtnet_txq *txq; 3136 int i; 3137 3138 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3139 rxq = &sc->vtnet_rxqs[i]; 3140 if (rxq->vtnrx_tq != NULL) 3141 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3142 3143 txq = &sc->vtnet_txqs[i]; 3144 if (txq->vtntx_tq != NULL) { 3145 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3146 #ifndef VTNET_LEGACY_TX 3147 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3148 #endif 3149 } 3150 } 3151 } 3152 3153 static void 3154 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3155 { 3156 struct vtnet_rxq *rxq; 3157 struct vtnet_txq *txq; 3158 int i; 3159 3160 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3161 rxq = &sc->vtnet_rxqs[i]; 3162 vtnet_rxq_free_mbufs(rxq); 3163 3164 txq = &sc->vtnet_txqs[i]; 3165 vtnet_txq_free_mbufs(txq); 3166 } 3167 } 3168 3169 static void 3170 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3171 { 3172 struct vtnet_rxq *rxq; 3173 struct vtnet_txq *txq; 3174 int i; 3175 3176 VTNET_CORE_LOCK_ASSERT(sc); 3177 3178 /* 3179 * Lock and unlock the per-queue mutex so we known the stop 3180 * state is visible. Doing only the active queues should be 3181 * sufficient, but it does not cost much extra to do all the 3182 * queues. 3183 */ 3184 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3185 rxq = &sc->vtnet_rxqs[i]; 3186 VTNET_RXQ_LOCK(rxq); 3187 VTNET_RXQ_UNLOCK(rxq); 3188 3189 txq = &sc->vtnet_txqs[i]; 3190 VTNET_TXQ_LOCK(txq); 3191 VTNET_TXQ_UNLOCK(txq); 3192 } 3193 } 3194 3195 static void 3196 vtnet_stop(struct vtnet_softc *sc) 3197 { 3198 device_t dev; 3199 if_t ifp; 3200 3201 dev = sc->vtnet_dev; 3202 ifp = sc->vtnet_ifp; 3203 3204 VTNET_CORE_LOCK_ASSERT(sc); 3205 3206 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3207 sc->vtnet_link_active = 0; 3208 callout_stop(&sc->vtnet_tick_ch); 3209 3210 /* Only advisory. */ 3211 vtnet_disable_interrupts(sc); 3212 3213 #ifdef DEV_NETMAP 3214 /* Stop any pending txsync/rxsync and disable them. */ 3215 netmap_disable_all_rings(ifp); 3216 #endif /* DEV_NETMAP */ 3217 3218 /* 3219 * Stop the host adapter. This resets it to the pre-initialized 3220 * state. It will not generate any interrupts until after it is 3221 * reinitialized. 3222 */ 3223 virtio_stop(dev); 3224 vtnet_stop_rendezvous(sc); 3225 3226 vtnet_drain_rxtx_queues(sc); 3227 sc->vtnet_act_vq_pairs = 1; 3228 } 3229 3230 static int 3231 vtnet_virtio_reinit(struct vtnet_softc *sc) 3232 { 3233 device_t dev; 3234 if_t ifp; 3235 uint64_t features; 3236 int error; 3237 3238 dev = sc->vtnet_dev; 3239 ifp = sc->vtnet_ifp; 3240 features = sc->vtnet_negotiated_features; 3241 3242 /* 3243 * Re-negotiate with the host, removing any disabled receive 3244 * features. Transmit features are disabled only on our side 3245 * via if_capenable and if_hwassist. 3246 */ 3247 3248 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3249 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3250 3251 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3252 features &= ~VTNET_LRO_FEATURES; 3253 3254 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3255 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3256 3257 error = virtio_reinit(dev, features); 3258 if (error) { 3259 device_printf(dev, "virtio reinit error %d\n", error); 3260 return (error); 3261 } 3262 3263 sc->vtnet_features = features; 3264 virtio_reinit_complete(dev); 3265 3266 return (0); 3267 } 3268 3269 static void 3270 vtnet_init_rx_filters(struct vtnet_softc *sc) 3271 { 3272 if_t ifp; 3273 3274 ifp = sc->vtnet_ifp; 3275 3276 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3277 vtnet_rx_filter(sc); 3278 vtnet_rx_filter_mac(sc); 3279 } 3280 3281 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3282 vtnet_rx_filter_vlan(sc); 3283 } 3284 3285 static int 3286 vtnet_init_rx_queues(struct vtnet_softc *sc) 3287 { 3288 device_t dev; 3289 if_t ifp; 3290 struct vtnet_rxq *rxq; 3291 int i, clustersz, error; 3292 3293 dev = sc->vtnet_dev; 3294 ifp = sc->vtnet_ifp; 3295 3296 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3297 sc->vtnet_rx_clustersz = clustersz; 3298 3299 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3300 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3301 VTNET_MAX_RX_SIZE, clustersz); 3302 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3303 ("%s: too many rx mbufs %d for %d segments", __func__, 3304 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3305 } else 3306 sc->vtnet_rx_nmbufs = 1; 3307 3308 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3309 rxq = &sc->vtnet_rxqs[i]; 3310 3311 /* Hold the lock to satisfy asserts. */ 3312 VTNET_RXQ_LOCK(rxq); 3313 error = vtnet_rxq_populate(rxq); 3314 VTNET_RXQ_UNLOCK(rxq); 3315 3316 if (error) { 3317 device_printf(dev, "cannot populate Rx queue %d\n", i); 3318 return (error); 3319 } 3320 } 3321 3322 return (0); 3323 } 3324 3325 static int 3326 vtnet_init_tx_queues(struct vtnet_softc *sc) 3327 { 3328 struct vtnet_txq *txq; 3329 int i; 3330 3331 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3332 txq = &sc->vtnet_txqs[i]; 3333 txq->vtntx_watchdog = 0; 3334 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3335 #ifdef DEV_NETMAP 3336 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3337 #endif /* DEV_NETMAP */ 3338 } 3339 3340 return (0); 3341 } 3342 3343 static int 3344 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3345 { 3346 int error; 3347 3348 error = vtnet_init_rx_queues(sc); 3349 if (error) 3350 return (error); 3351 3352 error = vtnet_init_tx_queues(sc); 3353 if (error) 3354 return (error); 3355 3356 return (0); 3357 } 3358 3359 static void 3360 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3361 { 3362 device_t dev; 3363 int npairs; 3364 3365 dev = sc->vtnet_dev; 3366 3367 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3368 sc->vtnet_act_vq_pairs = 1; 3369 return; 3370 } 3371 3372 npairs = sc->vtnet_req_vq_pairs; 3373 3374 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3375 device_printf(dev, "cannot set active queue pairs to %d, " 3376 "falling back to 1 queue pair\n", npairs); 3377 npairs = 1; 3378 } 3379 3380 sc->vtnet_act_vq_pairs = npairs; 3381 } 3382 3383 static void 3384 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3385 { 3386 if_t ifp; 3387 uint64_t features; 3388 int error; 3389 3390 ifp = sc->vtnet_ifp; 3391 features = sc->vtnet_features; 3392 3393 VTNET_CORE_LOCK_ASSERT(sc); 3394 3395 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3396 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3397 features |= VIRTIO_NET_F_GUEST_CSUM; 3398 else 3399 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3400 } 3401 3402 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3403 if (if_getcapenable(ifp) & IFCAP_LRO) 3404 features |= VTNET_LRO_FEATURES; 3405 else 3406 features &= ~VTNET_LRO_FEATURES; 3407 } 3408 3409 error = vtnet_ctrl_guest_offloads(sc, 3410 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3411 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3412 VIRTIO_NET_F_GUEST_UFO)); 3413 if (error) { 3414 device_printf(sc->vtnet_dev, 3415 "%s: cannot update Rx features\n", __func__); 3416 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3417 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3418 vtnet_init_locked(sc, 0); 3419 } 3420 } else 3421 sc->vtnet_features = features; 3422 } 3423 3424 static int 3425 vtnet_reinit(struct vtnet_softc *sc) 3426 { 3427 if_t ifp; 3428 int error; 3429 3430 ifp = sc->vtnet_ifp; 3431 3432 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3433 3434 error = vtnet_virtio_reinit(sc); 3435 if (error) 3436 return (error); 3437 3438 vtnet_set_macaddr(sc); 3439 vtnet_set_active_vq_pairs(sc); 3440 3441 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3442 vtnet_init_rx_filters(sc); 3443 3444 if_sethwassist(ifp, 0); 3445 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3446 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3447 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3448 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3449 if (if_getcapenable(ifp) & IFCAP_TSO4) 3450 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3451 if (if_getcapenable(ifp) & IFCAP_TSO6) 3452 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3453 3454 error = vtnet_init_rxtx_queues(sc); 3455 if (error) 3456 return (error); 3457 3458 return (0); 3459 } 3460 3461 static void 3462 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3463 { 3464 if_t ifp; 3465 3466 ifp = sc->vtnet_ifp; 3467 3468 VTNET_CORE_LOCK_ASSERT(sc); 3469 3470 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3471 return; 3472 3473 vtnet_stop(sc); 3474 3475 #ifdef DEV_NETMAP 3476 /* Once stopped we can update the netmap flags, if necessary. */ 3477 switch (init_mode) { 3478 case VTNET_INIT_NETMAP_ENTER: 3479 nm_set_native_flags(NA(ifp)); 3480 break; 3481 case VTNET_INIT_NETMAP_EXIT: 3482 nm_clear_native_flags(NA(ifp)); 3483 break; 3484 } 3485 #endif /* DEV_NETMAP */ 3486 3487 if (vtnet_reinit(sc) != 0) { 3488 vtnet_stop(sc); 3489 return; 3490 } 3491 3492 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3493 vtnet_update_link_status(sc); 3494 vtnet_enable_interrupts(sc); 3495 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3496 3497 #ifdef DEV_NETMAP 3498 /* Re-enable txsync/rxsync. */ 3499 netmap_enable_all_rings(ifp); 3500 #endif /* DEV_NETMAP */ 3501 } 3502 3503 static void 3504 vtnet_init(void *xsc) 3505 { 3506 struct vtnet_softc *sc; 3507 3508 sc = xsc; 3509 3510 VTNET_CORE_LOCK(sc); 3511 vtnet_init_locked(sc, 0); 3512 VTNET_CORE_UNLOCK(sc); 3513 } 3514 3515 static void 3516 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3517 { 3518 3519 /* 3520 * The control virtqueue is only polled and therefore it should 3521 * already be empty. 3522 */ 3523 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3524 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3525 } 3526 3527 static void 3528 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3529 struct sglist *sg, int readable, int writable) 3530 { 3531 struct virtqueue *vq; 3532 3533 vq = sc->vtnet_ctrl_vq; 3534 3535 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3536 VTNET_CORE_LOCK_ASSERT(sc); 3537 3538 if (!virtqueue_empty(vq)) 3539 return; 3540 3541 /* 3542 * Poll for the response, but the command is likely completed before 3543 * returning from the notify. 3544 */ 3545 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3546 virtqueue_notify(vq); 3547 virtqueue_poll(vq, NULL); 3548 } 3549 } 3550 3551 static int 3552 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3553 { 3554 struct sglist_seg segs[3]; 3555 struct sglist sg; 3556 struct { 3557 struct virtio_net_ctrl_hdr hdr __aligned(2); 3558 uint8_t pad1; 3559 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3560 uint8_t pad2; 3561 uint8_t ack; 3562 } s; 3563 int error; 3564 3565 error = 0; 3566 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3567 3568 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3569 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3570 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3571 s.ack = VIRTIO_NET_ERR; 3572 3573 sglist_init(&sg, nitems(segs), segs); 3574 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3575 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3576 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3577 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3578 3579 if (error == 0) 3580 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3581 3582 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3583 } 3584 3585 static int 3586 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3587 { 3588 struct sglist_seg segs[3]; 3589 struct sglist sg; 3590 struct { 3591 struct virtio_net_ctrl_hdr hdr __aligned(2); 3592 uint8_t pad1; 3593 uint64_t offloads __aligned(8); 3594 uint8_t pad2; 3595 uint8_t ack; 3596 } s; 3597 int error; 3598 3599 error = 0; 3600 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3601 3602 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3603 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3604 s.offloads = vtnet_gtoh64(sc, offloads); 3605 s.ack = VIRTIO_NET_ERR; 3606 3607 sglist_init(&sg, nitems(segs), segs); 3608 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3609 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3610 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3611 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3612 3613 if (error == 0) 3614 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3615 3616 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3617 } 3618 3619 static int 3620 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3621 { 3622 struct sglist_seg segs[3]; 3623 struct sglist sg; 3624 struct { 3625 struct virtio_net_ctrl_hdr hdr __aligned(2); 3626 uint8_t pad1; 3627 struct virtio_net_ctrl_mq mq __aligned(2); 3628 uint8_t pad2; 3629 uint8_t ack; 3630 } s; 3631 int error; 3632 3633 error = 0; 3634 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3635 3636 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3637 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3638 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3639 s.ack = VIRTIO_NET_ERR; 3640 3641 sglist_init(&sg, nitems(segs), segs); 3642 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3643 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3644 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3645 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3646 3647 if (error == 0) 3648 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3649 3650 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3651 } 3652 3653 static int 3654 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3655 { 3656 struct sglist_seg segs[3]; 3657 struct sglist sg; 3658 struct { 3659 struct virtio_net_ctrl_hdr hdr __aligned(2); 3660 uint8_t pad1; 3661 uint8_t onoff; 3662 uint8_t pad2; 3663 uint8_t ack; 3664 } s; 3665 int error; 3666 3667 error = 0; 3668 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3669 3670 s.hdr.class = VIRTIO_NET_CTRL_RX; 3671 s.hdr.cmd = cmd; 3672 s.onoff = on; 3673 s.ack = VIRTIO_NET_ERR; 3674 3675 sglist_init(&sg, nitems(segs), segs); 3676 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3677 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3678 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3679 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3680 3681 if (error == 0) 3682 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3683 3684 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3685 } 3686 3687 static int 3688 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3689 { 3690 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3691 } 3692 3693 static int 3694 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3695 { 3696 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3697 } 3698 3699 static void 3700 vtnet_rx_filter(struct vtnet_softc *sc) 3701 { 3702 device_t dev; 3703 if_t ifp; 3704 3705 dev = sc->vtnet_dev; 3706 ifp = sc->vtnet_ifp; 3707 3708 VTNET_CORE_LOCK_ASSERT(sc); 3709 3710 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3711 device_printf(dev, "cannot %s promiscuous mode\n", 3712 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3713 } 3714 3715 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3716 device_printf(dev, "cannot %s all-multicast mode\n", 3717 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3718 } 3719 } 3720 3721 static u_int 3722 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3723 { 3724 struct vtnet_softc *sc = arg; 3725 3726 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3727 return (0); 3728 3729 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3730 bcopy(LLADDR(sdl), 3731 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3732 ETHER_ADDR_LEN); 3733 3734 return (1); 3735 } 3736 3737 static u_int 3738 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3739 { 3740 struct vtnet_mac_filter *filter = arg; 3741 3742 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3743 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3744 ETHER_ADDR_LEN); 3745 3746 return (1); 3747 } 3748 3749 static void 3750 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3751 { 3752 struct virtio_net_ctrl_hdr hdr __aligned(2); 3753 struct vtnet_mac_filter *filter; 3754 struct sglist_seg segs[4]; 3755 struct sglist sg; 3756 if_t ifp; 3757 bool promisc, allmulti; 3758 u_int ucnt, mcnt; 3759 int error; 3760 uint8_t ack; 3761 3762 ifp = sc->vtnet_ifp; 3763 filter = sc->vtnet_mac_filter; 3764 error = 0; 3765 3766 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3767 VTNET_CORE_LOCK_ASSERT(sc); 3768 3769 /* Unicast MAC addresses: */ 3770 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3771 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3772 3773 if (promisc) { 3774 ucnt = 0; 3775 if_printf(ifp, "more than %d MAC addresses assigned, " 3776 "falling back to promiscuous mode\n", 3777 VTNET_MAX_MAC_ENTRIES); 3778 } 3779 3780 /* Multicast MAC addresses: */ 3781 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3782 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3783 3784 if (allmulti) { 3785 mcnt = 0; 3786 if_printf(ifp, "more than %d multicast MAC addresses " 3787 "assigned, falling back to all-multicast mode\n", 3788 VTNET_MAX_MAC_ENTRIES); 3789 } 3790 3791 if (promisc && allmulti) 3792 goto out; 3793 3794 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3795 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3796 3797 hdr.class = VIRTIO_NET_CTRL_MAC; 3798 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3799 ack = VIRTIO_NET_ERR; 3800 3801 sglist_init(&sg, nitems(segs), segs); 3802 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3803 error |= sglist_append(&sg, &filter->vmf_unicast, 3804 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3805 error |= sglist_append(&sg, &filter->vmf_multicast, 3806 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3807 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3808 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3809 3810 if (error == 0) 3811 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3812 if (ack != VIRTIO_NET_OK) 3813 if_printf(ifp, "error setting host MAC filter table\n"); 3814 3815 out: 3816 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3817 if_printf(ifp, "cannot enable promiscuous mode\n"); 3818 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3819 if_printf(ifp, "cannot enable all-multicast mode\n"); 3820 } 3821 3822 static int 3823 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3824 { 3825 struct sglist_seg segs[3]; 3826 struct sglist sg; 3827 struct { 3828 struct virtio_net_ctrl_hdr hdr __aligned(2); 3829 uint8_t pad1; 3830 uint16_t tag __aligned(2); 3831 uint8_t pad2; 3832 uint8_t ack; 3833 } s; 3834 int error; 3835 3836 error = 0; 3837 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3838 3839 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3840 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3841 s.tag = vtnet_gtoh16(sc, tag); 3842 s.ack = VIRTIO_NET_ERR; 3843 3844 sglist_init(&sg, nitems(segs), segs); 3845 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3846 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3847 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3848 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3849 3850 if (error == 0) 3851 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3852 3853 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3854 } 3855 3856 static void 3857 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3858 { 3859 int i, bit; 3860 uint32_t w; 3861 uint16_t tag; 3862 3863 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3864 VTNET_CORE_LOCK_ASSERT(sc); 3865 3866 /* Enable the filter for each configured VLAN. */ 3867 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3868 w = sc->vtnet_vlan_filter[i]; 3869 3870 while ((bit = ffs(w) - 1) != -1) { 3871 w &= ~(1 << bit); 3872 tag = sizeof(w) * CHAR_BIT * i + bit; 3873 3874 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3875 device_printf(sc->vtnet_dev, 3876 "cannot enable VLAN %d filter\n", tag); 3877 } 3878 } 3879 } 3880 } 3881 3882 static void 3883 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3884 { 3885 if_t ifp; 3886 int idx, bit; 3887 3888 ifp = sc->vtnet_ifp; 3889 idx = (tag >> 5) & 0x7F; 3890 bit = tag & 0x1F; 3891 3892 if (tag == 0 || tag > 4095) 3893 return; 3894 3895 VTNET_CORE_LOCK(sc); 3896 3897 if (add) 3898 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3899 else 3900 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3901 3902 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3903 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3904 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3905 device_printf(sc->vtnet_dev, 3906 "cannot %s VLAN %d %s the host filter table\n", 3907 add ? "add" : "remove", tag, add ? "to" : "from"); 3908 } 3909 3910 VTNET_CORE_UNLOCK(sc); 3911 } 3912 3913 static void 3914 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3915 { 3916 3917 if (if_getsoftc(ifp) != arg) 3918 return; 3919 3920 vtnet_update_vlan_filter(arg, 1, tag); 3921 } 3922 3923 static void 3924 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3925 { 3926 3927 if (if_getsoftc(ifp) != arg) 3928 return; 3929 3930 vtnet_update_vlan_filter(arg, 0, tag); 3931 } 3932 3933 static void 3934 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3935 { 3936 if_t ifp; 3937 uint32_t speed; 3938 3939 ifp = sc->vtnet_ifp; 3940 3941 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3942 return; 3943 3944 /* BMV: Ignore duplex. */ 3945 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3946 offsetof(struct virtio_net_config, speed)); 3947 if (speed != UINT32_MAX) 3948 if_setbaudrate(ifp, IF_Mbps(speed)); 3949 } 3950 3951 static int 3952 vtnet_is_link_up(struct vtnet_softc *sc) 3953 { 3954 uint16_t status; 3955 3956 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3957 return (1); 3958 3959 status = virtio_read_dev_config_2(sc->vtnet_dev, 3960 offsetof(struct virtio_net_config, status)); 3961 3962 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3963 } 3964 3965 static void 3966 vtnet_update_link_status(struct vtnet_softc *sc) 3967 { 3968 if_t ifp; 3969 int link; 3970 3971 ifp = sc->vtnet_ifp; 3972 VTNET_CORE_LOCK_ASSERT(sc); 3973 link = vtnet_is_link_up(sc); 3974 3975 /* Notify if the link status has changed. */ 3976 if (link != 0 && sc->vtnet_link_active == 0) { 3977 vtnet_update_speed_duplex(sc); 3978 sc->vtnet_link_active = 1; 3979 if_link_state_change(ifp, LINK_STATE_UP); 3980 } else if (link == 0 && sc->vtnet_link_active != 0) { 3981 sc->vtnet_link_active = 0; 3982 if_link_state_change(ifp, LINK_STATE_DOWN); 3983 } 3984 } 3985 3986 static int 3987 vtnet_ifmedia_upd(if_t ifp __unused) 3988 { 3989 return (EOPNOTSUPP); 3990 } 3991 3992 static void 3993 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 3994 { 3995 struct vtnet_softc *sc; 3996 3997 sc = if_getsoftc(ifp); 3998 3999 ifmr->ifm_status = IFM_AVALID; 4000 ifmr->ifm_active = IFM_ETHER; 4001 4002 VTNET_CORE_LOCK(sc); 4003 if (vtnet_is_link_up(sc) != 0) { 4004 ifmr->ifm_status |= IFM_ACTIVE; 4005 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 4006 } else 4007 ifmr->ifm_active |= IFM_NONE; 4008 VTNET_CORE_UNLOCK(sc); 4009 } 4010 4011 static void 4012 vtnet_get_macaddr(struct vtnet_softc *sc) 4013 { 4014 4015 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 4016 virtio_read_device_config_array(sc->vtnet_dev, 4017 offsetof(struct virtio_net_config, mac), 4018 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4019 } else { 4020 /* Generate a random locally administered unicast address. */ 4021 sc->vtnet_hwaddr[0] = 0xB2; 4022 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4023 } 4024 } 4025 4026 static void 4027 vtnet_set_macaddr(struct vtnet_softc *sc) 4028 { 4029 device_t dev; 4030 int error; 4031 4032 dev = sc->vtnet_dev; 4033 4034 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4035 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4036 if (error) 4037 device_printf(dev, "unable to set MAC address\n"); 4038 return; 4039 } 4040 4041 /* MAC in config is read-only in modern VirtIO. */ 4042 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4043 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4044 virtio_write_dev_config_1(dev, 4045 offsetof(struct virtio_net_config, mac) + i, 4046 sc->vtnet_hwaddr[i]); 4047 } 4048 } 4049 } 4050 4051 static void 4052 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4053 { 4054 4055 /* Assign MAC address if it was generated. */ 4056 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4057 vtnet_set_macaddr(sc); 4058 } 4059 4060 static void 4061 vtnet_vlan_tag_remove(struct mbuf *m) 4062 { 4063 struct ether_vlan_header *evh; 4064 4065 evh = mtod(m, struct ether_vlan_header *); 4066 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4067 m->m_flags |= M_VLANTAG; 4068 4069 /* Strip the 802.1Q header. */ 4070 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4071 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4072 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4073 } 4074 4075 static void 4076 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4077 { 4078 int limit; 4079 4080 limit = vtnet_tunable_int(sc, "rx_process_limit", 4081 vtnet_rx_process_limit); 4082 if (limit < 0) 4083 limit = INT_MAX; 4084 sc->vtnet_rx_process_limit = limit; 4085 } 4086 4087 static void 4088 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4089 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4090 { 4091 struct sysctl_oid *node; 4092 struct sysctl_oid_list *list; 4093 struct vtnet_rxq_stats *stats; 4094 char namebuf[16]; 4095 4096 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4097 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4098 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4099 list = SYSCTL_CHILDREN(node); 4100 4101 stats = &rxq->vtnrx_stats; 4102 4103 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4104 &stats->vrxs_ipackets, "Receive packets"); 4105 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4106 &stats->vrxs_ibytes, "Receive bytes"); 4107 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4108 &stats->vrxs_iqdrops, "Receive drops"); 4109 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4110 &stats->vrxs_ierrors, "Receive errors"); 4111 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4112 &stats->vrxs_csum, "Receive checksum offloaded"); 4113 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4114 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4116 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4117 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4118 &stats->vrxs_rescheduled, 4119 "Receive interrupt handler rescheduled"); 4120 } 4121 4122 static void 4123 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4124 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4125 { 4126 struct sysctl_oid *node; 4127 struct sysctl_oid_list *list; 4128 struct vtnet_txq_stats *stats; 4129 char namebuf[16]; 4130 4131 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4132 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4133 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4134 list = SYSCTL_CHILDREN(node); 4135 4136 stats = &txq->vtntx_stats; 4137 4138 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4139 &stats->vtxs_opackets, "Transmit packets"); 4140 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4141 &stats->vtxs_obytes, "Transmit bytes"); 4142 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4143 &stats->vtxs_omcasts, "Transmit multicasts"); 4144 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4145 &stats->vtxs_csum, "Transmit checksum offloaded"); 4146 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4147 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4148 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4149 &stats->vtxs_rescheduled, 4150 "Transmit interrupt handler rescheduled"); 4151 } 4152 4153 static void 4154 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4155 { 4156 device_t dev; 4157 struct sysctl_ctx_list *ctx; 4158 struct sysctl_oid *tree; 4159 struct sysctl_oid_list *child; 4160 int i; 4161 4162 dev = sc->vtnet_dev; 4163 ctx = device_get_sysctl_ctx(dev); 4164 tree = device_get_sysctl_tree(dev); 4165 child = SYSCTL_CHILDREN(tree); 4166 4167 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4168 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4169 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4170 } 4171 } 4172 4173 static void 4174 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4175 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4176 { 4177 struct vtnet_statistics *stats; 4178 struct vtnet_rxq_stats rxaccum; 4179 struct vtnet_txq_stats txaccum; 4180 4181 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4182 4183 stats = &sc->vtnet_stats; 4184 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4185 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4186 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4187 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4188 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4189 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4190 4191 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4192 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4193 "Mbuf cluster allocation failures"); 4194 4195 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4196 CTLFLAG_RD, &stats->rx_frame_too_large, 4197 "Received frame larger than the mbuf chain"); 4198 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4199 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4200 "Enqueuing the replacement receive mbuf failed"); 4201 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4202 CTLFLAG_RD, &stats->rx_mergeable_failed, 4203 "Mergeable buffers receive failures"); 4204 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4205 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4206 "Received checksum offloaded buffer with unsupported " 4207 "Ethernet type"); 4208 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4209 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4210 "Received checksum offloaded buffer with incorrect IP protocol"); 4211 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4212 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4213 "Received checksum offloaded buffer with incorrect offset"); 4214 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4215 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4216 "Received checksum offloaded buffer with incorrect protocol"); 4217 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4218 CTLFLAG_RD, &stats->rx_csum_failed, 4219 "Received buffer checksum offload failed"); 4220 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4221 CTLFLAG_RD, &stats->rx_csum_offloaded, 4222 "Received buffer checksum offload succeeded"); 4223 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4224 CTLFLAG_RD, &stats->rx_task_rescheduled, 4225 "Times the receive interrupt task rescheduled itself"); 4226 4227 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4228 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4229 "Aborted transmit of checksum offloaded buffer with unknown " 4230 "Ethernet type"); 4231 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4232 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4233 "Aborted transmit of checksum offloaded buffer because mismatched " 4234 "protocols"); 4235 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4236 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4237 "Aborted transmit of TSO buffer with non TCP protocol"); 4238 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4239 CTLFLAG_RD, &stats->tx_tso_without_csum, 4240 "Aborted transmit of TSO buffer without TCP checksum offload"); 4241 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4242 CTLFLAG_RD, &stats->tx_defragged, 4243 "Transmit mbufs defragged"); 4244 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4245 CTLFLAG_RD, &stats->tx_defrag_failed, 4246 "Aborted transmit of buffer because defrag failed"); 4247 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4248 CTLFLAG_RD, &stats->tx_csum_offloaded, 4249 "Offloaded checksum of transmitted buffer"); 4250 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4251 CTLFLAG_RD, &stats->tx_tso_offloaded, 4252 "Segmentation offload of transmitted buffer"); 4253 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4254 CTLFLAG_RD, &stats->tx_task_rescheduled, 4255 "Times the transmit interrupt task rescheduled itself"); 4256 } 4257 4258 static void 4259 vtnet_setup_sysctl(struct vtnet_softc *sc) 4260 { 4261 device_t dev; 4262 struct sysctl_ctx_list *ctx; 4263 struct sysctl_oid *tree; 4264 struct sysctl_oid_list *child; 4265 4266 dev = sc->vtnet_dev; 4267 ctx = device_get_sysctl_ctx(dev); 4268 tree = device_get_sysctl_tree(dev); 4269 child = SYSCTL_CHILDREN(tree); 4270 4271 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4272 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4273 "Number of maximum supported virtqueue pairs"); 4274 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4275 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4276 "Number of requested virtqueue pairs"); 4277 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4278 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4279 "Number of active virtqueue pairs"); 4280 4281 vtnet_setup_stat_sysctl(ctx, child, sc); 4282 } 4283 4284 static void 4285 vtnet_load_tunables(struct vtnet_softc *sc) 4286 { 4287 4288 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4289 "lro_entry_count", vtnet_lro_entry_count); 4290 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4291 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4292 4293 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4294 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4295 } 4296 4297 static int 4298 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4299 { 4300 4301 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4302 } 4303 4304 static void 4305 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4306 { 4307 4308 virtqueue_disable_intr(rxq->vtnrx_vq); 4309 } 4310 4311 static int 4312 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4313 { 4314 struct virtqueue *vq; 4315 4316 vq = txq->vtntx_vq; 4317 4318 if (vtnet_txq_below_threshold(txq) != 0) 4319 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4320 4321 /* 4322 * The free count is above our threshold. Keep the Tx interrupt 4323 * disabled until the queue is fuller. 4324 */ 4325 return (0); 4326 } 4327 4328 static void 4329 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4330 { 4331 4332 virtqueue_disable_intr(txq->vtntx_vq); 4333 } 4334 4335 static void 4336 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4337 { 4338 struct vtnet_rxq *rxq; 4339 int i; 4340 4341 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4342 rxq = &sc->vtnet_rxqs[i]; 4343 if (vtnet_rxq_enable_intr(rxq) != 0) 4344 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4345 } 4346 } 4347 4348 static void 4349 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4350 { 4351 int i; 4352 4353 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4354 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4355 } 4356 4357 static void 4358 vtnet_enable_interrupts(struct vtnet_softc *sc) 4359 { 4360 4361 vtnet_enable_rx_interrupts(sc); 4362 vtnet_enable_tx_interrupts(sc); 4363 } 4364 4365 static void 4366 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4367 { 4368 int i; 4369 4370 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4371 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4372 } 4373 4374 static void 4375 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4376 { 4377 int i; 4378 4379 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4380 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4381 } 4382 4383 static void 4384 vtnet_disable_interrupts(struct vtnet_softc *sc) 4385 { 4386 4387 vtnet_disable_rx_interrupts(sc); 4388 vtnet_disable_tx_interrupts(sc); 4389 } 4390 4391 static int 4392 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4393 { 4394 char path[64]; 4395 4396 snprintf(path, sizeof(path), 4397 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4398 TUNABLE_INT_FETCH(path, &def); 4399 4400 return (def); 4401 } 4402 4403 #ifdef DEBUGNET 4404 static void 4405 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4406 { 4407 struct vtnet_softc *sc; 4408 4409 sc = if_getsoftc(ifp); 4410 4411 VTNET_CORE_LOCK(sc); 4412 *nrxr = sc->vtnet_req_vq_pairs; 4413 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4414 *clsize = sc->vtnet_rx_clustersz; 4415 VTNET_CORE_UNLOCK(sc); 4416 } 4417 4418 static void 4419 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4420 { 4421 struct vtnet_softc *sc; 4422 static bool sw_lro_enabled = false; 4423 4424 /* 4425 * Disable software LRO, since it would require entering the network 4426 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4427 */ 4428 sc = if_getsoftc(ifp); 4429 switch (event) { 4430 case DEBUGNET_START: 4431 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4432 if (sw_lro_enabled) 4433 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4434 break; 4435 case DEBUGNET_END: 4436 if (sw_lro_enabled) 4437 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4438 break; 4439 } 4440 } 4441 4442 static int 4443 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4444 { 4445 struct vtnet_softc *sc; 4446 struct vtnet_txq *txq; 4447 int error; 4448 4449 sc = if_getsoftc(ifp); 4450 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4451 IFF_DRV_RUNNING) 4452 return (EBUSY); 4453 4454 txq = &sc->vtnet_txqs[0]; 4455 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4456 if (error == 0) 4457 (void)vtnet_txq_notify(txq); 4458 return (error); 4459 } 4460 4461 static int 4462 vtnet_debugnet_poll(if_t ifp, int count) 4463 { 4464 struct vtnet_softc *sc; 4465 int i; 4466 4467 sc = if_getsoftc(ifp); 4468 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4469 IFF_DRV_RUNNING) 4470 return (EBUSY); 4471 4472 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4473 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4474 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4475 return (0); 4476 } 4477 #endif /* DEBUGNET */ 4478