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