1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/param.h> 32 #include <sys/eventhandler.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/sockio.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/module.h> 39 #include <sys/msan.h> 40 #include <sys/socket.h> 41 #include <sys/sysctl.h> 42 #include <sys/random.h> 43 #include <sys/sglist.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/taskqueue.h> 47 #include <sys/smp.h> 48 #include <machine/smp.h> 49 50 #include <vm/uma.h> 51 52 #include <net/debugnet.h> 53 #include <net/ethernet.h> 54 #include <net/pfil.h> 55 #include <net/if.h> 56 #include <net/if_var.h> 57 #include <net/if_arp.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/if_media.h> 61 #include <net/if_vlan_var.h> 62 63 #include <net/bpf.h> 64 65 #include <netinet/in_systm.h> 66 #include <netinet/in.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #include <netinet/udp.h> 71 #include <netinet/tcp.h> 72 #include <netinet/tcp_lro.h> 73 74 #include <machine/bus.h> 75 #include <machine/resource.h> 76 #include <sys/bus.h> 77 #include <sys/rman.h> 78 79 #include <dev/virtio/virtio.h> 80 #include <dev/virtio/virtqueue.h> 81 #include <dev/virtio/network/virtio_net.h> 82 #include <dev/virtio/network/if_vtnetvar.h> 83 #include "virtio_if.h" 84 85 #include "opt_inet.h" 86 #include "opt_inet6.h" 87 88 #if defined(INET) || defined(INET6) 89 #include <machine/in_cksum.h> 90 #endif 91 92 #ifdef __NO_STRICT_ALIGNMENT 93 #define VTNET_ETHER_ALIGN 0 94 #else /* Strict alignment */ 95 #define VTNET_ETHER_ALIGN ETHER_ALIGN 96 #endif 97 98 static int vtnet_modevent(module_t, int, void *); 99 100 static int vtnet_probe(device_t); 101 static int vtnet_attach(device_t); 102 static int vtnet_detach(device_t); 103 static int vtnet_suspend(device_t); 104 static int vtnet_resume(device_t); 105 static int vtnet_shutdown(device_t); 106 static int vtnet_attach_completed(device_t); 107 static int vtnet_config_change(device_t); 108 109 static int vtnet_negotiate_features(struct vtnet_softc *); 110 static int vtnet_setup_features(struct vtnet_softc *); 111 static int vtnet_init_rxq(struct vtnet_softc *, int); 112 static int vtnet_init_txq(struct vtnet_softc *, int); 113 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 114 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 115 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 116 static void vtnet_free_rx_filters(struct vtnet_softc *); 117 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 118 static int vtnet_alloc_interface(struct vtnet_softc *); 119 static int vtnet_setup_interface(struct vtnet_softc *); 120 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 121 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 122 static int vtnet_ioctl_multi(struct vtnet_softc *); 123 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 124 static int vtnet_ioctl(if_t, u_long, caddr_t); 125 static uint64_t vtnet_get_counter(if_t, ift_counter); 126 127 static int vtnet_rxq_populate(struct vtnet_rxq *); 128 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 129 static struct mbuf * 130 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 131 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 132 struct mbuf *, int); 133 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 134 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 135 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 136 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 137 uint16_t, int, struct virtio_net_hdr *); 138 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 139 uint16_t, int, struct virtio_net_hdr *); 140 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 141 struct virtio_net_hdr *); 142 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 143 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 144 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 145 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 146 struct virtio_net_hdr *); 147 static int vtnet_rxq_eof(struct vtnet_rxq *); 148 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 149 static void vtnet_rx_vq_intr(void *); 150 static void vtnet_rxq_tq_intr(void *, int); 151 152 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 153 static int vtnet_txq_below_threshold(struct vtnet_txq *); 154 static int vtnet_txq_notify(struct vtnet_txq *); 155 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 156 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 157 int *, int *, int *); 158 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 159 int, struct virtio_net_hdr *); 160 static struct mbuf * 161 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 162 struct virtio_net_hdr *); 163 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 164 struct vtnet_tx_header *); 165 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 166 #ifdef VTNET_LEGACY_TX 167 static void vtnet_start_locked(struct vtnet_txq *, if_t); 168 static void vtnet_start(if_t); 169 #else 170 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 171 static int vtnet_txq_mq_start(if_t, struct mbuf *); 172 static void vtnet_txq_tq_deferred(void *, int); 173 #endif 174 static void vtnet_txq_start(struct vtnet_txq *); 175 static void vtnet_txq_tq_intr(void *, int); 176 static int vtnet_txq_eof(struct vtnet_txq *); 177 static void vtnet_tx_vq_intr(void *); 178 static void vtnet_tx_start_all(struct vtnet_softc *); 179 180 #ifndef VTNET_LEGACY_TX 181 static void vtnet_qflush(if_t); 182 #endif 183 184 static int vtnet_watchdog(struct vtnet_txq *); 185 static void vtnet_accum_stats(struct vtnet_softc *, 186 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 187 static void vtnet_tick(void *); 188 189 static void vtnet_start_taskqueues(struct vtnet_softc *); 190 static void vtnet_free_taskqueues(struct vtnet_softc *); 191 static void vtnet_drain_taskqueues(struct vtnet_softc *); 192 193 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 194 static void vtnet_stop_rendezvous(struct vtnet_softc *); 195 static void vtnet_stop(struct vtnet_softc *); 196 static int vtnet_virtio_reinit(struct vtnet_softc *); 197 static void vtnet_init_rx_filters(struct vtnet_softc *); 198 static int vtnet_init_rx_queues(struct vtnet_softc *); 199 static int vtnet_init_tx_queues(struct vtnet_softc *); 200 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 201 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 202 static void vtnet_update_rx_offloads(struct vtnet_softc *); 203 static int vtnet_reinit(struct vtnet_softc *); 204 static void vtnet_init_locked(struct vtnet_softc *, int); 205 static void vtnet_init(void *); 206 207 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 208 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 209 struct sglist *, int, int); 210 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 211 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 212 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 213 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 214 static int vtnet_set_promisc(struct vtnet_softc *, bool); 215 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 216 static void vtnet_rx_filter(struct vtnet_softc *); 217 static void vtnet_rx_filter_mac(struct vtnet_softc *); 218 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 219 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 220 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 221 static void vtnet_register_vlan(void *, if_t, uint16_t); 222 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 223 224 static void vtnet_update_speed_duplex(struct vtnet_softc *); 225 static int vtnet_is_link_up(struct vtnet_softc *); 226 static void vtnet_update_link_status(struct vtnet_softc *); 227 static int vtnet_ifmedia_upd(if_t); 228 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 229 static void vtnet_get_macaddr(struct vtnet_softc *); 230 static void vtnet_set_macaddr(struct vtnet_softc *); 231 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 232 static void vtnet_vlan_tag_remove(struct mbuf *); 233 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 234 235 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 236 struct sysctl_oid_list *, struct vtnet_rxq *); 237 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 238 struct sysctl_oid_list *, struct vtnet_txq *); 239 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 240 static void vtnet_load_tunables(struct vtnet_softc *); 241 static void vtnet_setup_sysctl(struct vtnet_softc *); 242 243 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 244 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 245 static int vtnet_txq_enable_intr(struct vtnet_txq *); 246 static void vtnet_txq_disable_intr(struct vtnet_txq *); 247 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 248 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 249 static void vtnet_enable_interrupts(struct vtnet_softc *); 250 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 251 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 252 static void vtnet_disable_interrupts(struct vtnet_softc *); 253 254 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 255 256 DEBUGNET_DEFINE(vtnet); 257 258 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 259 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 260 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 261 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 262 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 263 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 264 265 /* Tunables. */ 266 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 267 "VirtIO Net driver parameters"); 268 269 static int vtnet_csum_disable = 0; 270 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 271 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 272 273 static int vtnet_fixup_needs_csum = 0; 274 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 275 &vtnet_fixup_needs_csum, 0, 276 "Calculate valid checksum for NEEDS_CSUM packets"); 277 278 static int vtnet_tso_disable = 0; 279 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 280 &vtnet_tso_disable, 0, "Disables TSO"); 281 282 static int vtnet_lro_disable = 0; 283 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 284 &vtnet_lro_disable, 0, "Disables hardware LRO"); 285 286 static int vtnet_mq_disable = 0; 287 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 288 &vtnet_mq_disable, 0, "Disables multiqueue support"); 289 290 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 291 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 292 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 293 294 static int vtnet_tso_maxlen = IP_MAXPACKET; 295 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 296 &vtnet_tso_maxlen, 0, "TSO burst limit"); 297 298 static int vtnet_rx_process_limit = 1024; 299 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 300 &vtnet_rx_process_limit, 0, 301 "Number of RX segments processed in one pass"); 302 303 static int vtnet_lro_entry_count = 128; 304 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 305 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 306 307 /* Enable sorted LRO, and the depth of the mbuf queue. */ 308 static int vtnet_lro_mbufq_depth = 0; 309 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 310 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 311 312 static uma_zone_t vtnet_tx_header_zone; 313 314 static struct virtio_feature_desc vtnet_feature_desc[] = { 315 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 316 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 317 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 318 { VIRTIO_NET_F_MAC, "MAC" }, 319 { VIRTIO_NET_F_GSO, "TxGSO" }, 320 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 321 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 322 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 323 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 324 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 325 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 326 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 327 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 328 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 329 { VIRTIO_NET_F_STATUS, "Status" }, 330 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 331 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 332 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 333 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 334 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 335 { VIRTIO_NET_F_MQ, "Multiqueue" }, 336 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 337 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 338 339 { 0, NULL } 340 }; 341 342 static device_method_t vtnet_methods[] = { 343 /* Device methods. */ 344 DEVMETHOD(device_probe, vtnet_probe), 345 DEVMETHOD(device_attach, vtnet_attach), 346 DEVMETHOD(device_detach, vtnet_detach), 347 DEVMETHOD(device_suspend, vtnet_suspend), 348 DEVMETHOD(device_resume, vtnet_resume), 349 DEVMETHOD(device_shutdown, vtnet_shutdown), 350 351 /* VirtIO methods. */ 352 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 353 DEVMETHOD(virtio_config_change, vtnet_config_change), 354 355 DEVMETHOD_END 356 }; 357 358 #ifdef DEV_NETMAP 359 #include <dev/netmap/if_vtnet_netmap.h> 360 #endif 361 362 static driver_t vtnet_driver = { 363 .name = "vtnet", 364 .methods = vtnet_methods, 365 .size = sizeof(struct vtnet_softc) 366 }; 367 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 368 MODULE_VERSION(vtnet, 1); 369 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 370 #ifdef DEV_NETMAP 371 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 372 #endif 373 374 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 375 376 static int 377 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 378 { 379 int error = 0; 380 static int loaded = 0; 381 382 switch (type) { 383 case MOD_LOAD: 384 if (loaded++ == 0) { 385 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 386 sizeof(struct vtnet_tx_header), 387 NULL, NULL, NULL, NULL, 0, 0); 388 #ifdef DEBUGNET 389 /* 390 * We need to allocate from this zone in the transmit path, so ensure 391 * that we have at least one item per header available. 392 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 393 * buckets 394 */ 395 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 396 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 397 #endif 398 } 399 break; 400 case MOD_QUIESCE: 401 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 402 error = EBUSY; 403 break; 404 case MOD_UNLOAD: 405 if (--loaded == 0) { 406 uma_zdestroy(vtnet_tx_header_zone); 407 vtnet_tx_header_zone = NULL; 408 } 409 break; 410 case MOD_SHUTDOWN: 411 break; 412 default: 413 error = EOPNOTSUPP; 414 break; 415 } 416 417 return (error); 418 } 419 420 static int 421 vtnet_probe(device_t dev) 422 { 423 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 424 } 425 426 static int 427 vtnet_attach(device_t dev) 428 { 429 struct vtnet_softc *sc; 430 int error; 431 432 sc = device_get_softc(dev); 433 sc->vtnet_dev = dev; 434 virtio_set_feature_desc(dev, vtnet_feature_desc); 435 436 VTNET_CORE_LOCK_INIT(sc); 437 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 438 vtnet_load_tunables(sc); 439 440 error = vtnet_alloc_interface(sc); 441 if (error) { 442 device_printf(dev, "cannot allocate interface\n"); 443 goto fail; 444 } 445 446 vtnet_setup_sysctl(sc); 447 448 error = vtnet_setup_features(sc); 449 if (error) { 450 device_printf(dev, "cannot setup features\n"); 451 goto fail; 452 } 453 454 error = vtnet_alloc_rx_filters(sc); 455 if (error) { 456 device_printf(dev, "cannot allocate Rx filters\n"); 457 goto fail; 458 } 459 460 error = vtnet_alloc_rxtx_queues(sc); 461 if (error) { 462 device_printf(dev, "cannot allocate queues\n"); 463 goto fail; 464 } 465 466 error = vtnet_alloc_virtqueues(sc); 467 if (error) { 468 device_printf(dev, "cannot allocate virtqueues\n"); 469 goto fail; 470 } 471 472 error = vtnet_setup_interface(sc); 473 if (error) { 474 device_printf(dev, "cannot setup interface\n"); 475 goto fail; 476 } 477 478 error = virtio_setup_intr(dev, INTR_TYPE_NET); 479 if (error) { 480 device_printf(dev, "cannot setup interrupts\n"); 481 ether_ifdetach(sc->vtnet_ifp); 482 goto fail; 483 } 484 485 #ifdef DEV_NETMAP 486 vtnet_netmap_attach(sc); 487 #endif 488 vtnet_start_taskqueues(sc); 489 490 fail: 491 if (error) 492 vtnet_detach(dev); 493 494 return (error); 495 } 496 497 static int 498 vtnet_detach(device_t dev) 499 { 500 struct vtnet_softc *sc; 501 if_t ifp; 502 503 sc = device_get_softc(dev); 504 ifp = sc->vtnet_ifp; 505 506 if (device_is_attached(dev)) { 507 VTNET_CORE_LOCK(sc); 508 vtnet_stop(sc); 509 VTNET_CORE_UNLOCK(sc); 510 511 callout_drain(&sc->vtnet_tick_ch); 512 vtnet_drain_taskqueues(sc); 513 514 ether_ifdetach(ifp); 515 } 516 517 #ifdef DEV_NETMAP 518 netmap_detach(ifp); 519 #endif 520 521 if (sc->vtnet_pfil != NULL) { 522 pfil_head_unregister(sc->vtnet_pfil); 523 sc->vtnet_pfil = NULL; 524 } 525 526 vtnet_free_taskqueues(sc); 527 528 if (sc->vtnet_vlan_attach != NULL) { 529 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 530 sc->vtnet_vlan_attach = NULL; 531 } 532 if (sc->vtnet_vlan_detach != NULL) { 533 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 534 sc->vtnet_vlan_detach = NULL; 535 } 536 537 ifmedia_removeall(&sc->vtnet_media); 538 539 if (ifp != NULL) { 540 if_free(ifp); 541 sc->vtnet_ifp = NULL; 542 } 543 544 vtnet_free_rxtx_queues(sc); 545 vtnet_free_rx_filters(sc); 546 547 if (sc->vtnet_ctrl_vq != NULL) 548 vtnet_free_ctrl_vq(sc); 549 550 VTNET_CORE_LOCK_DESTROY(sc); 551 552 return (0); 553 } 554 555 static int 556 vtnet_suspend(device_t dev) 557 { 558 struct vtnet_softc *sc; 559 560 sc = device_get_softc(dev); 561 562 VTNET_CORE_LOCK(sc); 563 vtnet_stop(sc); 564 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 565 VTNET_CORE_UNLOCK(sc); 566 567 return (0); 568 } 569 570 static int 571 vtnet_resume(device_t dev) 572 { 573 struct vtnet_softc *sc; 574 if_t ifp; 575 576 sc = device_get_softc(dev); 577 ifp = sc->vtnet_ifp; 578 579 VTNET_CORE_LOCK(sc); 580 if (if_getflags(ifp) & IFF_UP) 581 vtnet_init_locked(sc, 0); 582 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 583 VTNET_CORE_UNLOCK(sc); 584 585 return (0); 586 } 587 588 static int 589 vtnet_shutdown(device_t dev) 590 { 591 /* 592 * Suspend already does all of what we need to 593 * do here; we just never expect to be resumed. 594 */ 595 return (vtnet_suspend(dev)); 596 } 597 598 static int 599 vtnet_attach_completed(device_t dev) 600 { 601 struct vtnet_softc *sc; 602 603 sc = device_get_softc(dev); 604 605 VTNET_CORE_LOCK(sc); 606 vtnet_attached_set_macaddr(sc); 607 VTNET_CORE_UNLOCK(sc); 608 609 return (0); 610 } 611 612 static int 613 vtnet_config_change(device_t dev) 614 { 615 struct vtnet_softc *sc; 616 617 sc = device_get_softc(dev); 618 619 VTNET_CORE_LOCK(sc); 620 vtnet_update_link_status(sc); 621 if (sc->vtnet_link_active != 0) 622 vtnet_tx_start_all(sc); 623 VTNET_CORE_UNLOCK(sc); 624 625 return (0); 626 } 627 628 static int 629 vtnet_negotiate_features(struct vtnet_softc *sc) 630 { 631 device_t dev; 632 uint64_t features, negotiated_features; 633 int no_csum; 634 635 dev = sc->vtnet_dev; 636 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 637 VTNET_LEGACY_FEATURES; 638 639 /* 640 * TSO and LRO are only available when their corresponding checksum 641 * offload feature is also negotiated. 642 */ 643 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 644 if (no_csum) 645 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 646 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 647 features &= ~VTNET_TSO_FEATURES; 648 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 649 features &= ~VTNET_LRO_FEATURES; 650 651 #ifndef VTNET_LEGACY_TX 652 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 653 features &= ~VIRTIO_NET_F_MQ; 654 #else 655 features &= ~VIRTIO_NET_F_MQ; 656 #endif 657 658 negotiated_features = virtio_negotiate_features(dev, features); 659 660 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 661 uint16_t mtu; 662 663 mtu = virtio_read_dev_config_2(dev, 664 offsetof(struct virtio_net_config, mtu)); 665 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 666 device_printf(dev, "Invalid MTU value: %d. " 667 "MTU feature disabled.\n", mtu); 668 features &= ~VIRTIO_NET_F_MTU; 669 negotiated_features = 670 virtio_negotiate_features(dev, features); 671 } 672 } 673 674 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 675 uint16_t npairs; 676 677 npairs = virtio_read_dev_config_2(dev, 678 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 679 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 680 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 681 device_printf(dev, "Invalid max_virtqueue_pairs value: " 682 "%d. Multiqueue feature disabled.\n", npairs); 683 features &= ~VIRTIO_NET_F_MQ; 684 negotiated_features = 685 virtio_negotiate_features(dev, features); 686 } 687 } 688 689 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 690 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 691 /* 692 * LRO without mergeable buffers requires special care. This 693 * is not ideal because every receive buffer must be large 694 * enough to hold the maximum TCP packet, the Ethernet header, 695 * and the header. This requires up to 34 descriptors with 696 * MCLBYTES clusters. If we do not have indirect descriptors, 697 * LRO is disabled since the virtqueue will not contain very 698 * many receive buffers. 699 */ 700 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 701 device_printf(dev, 702 "Host LRO disabled since both mergeable buffers " 703 "and indirect descriptors were not negotiated\n"); 704 features &= ~VTNET_LRO_FEATURES; 705 negotiated_features = 706 virtio_negotiate_features(dev, features); 707 } else 708 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 709 } 710 711 sc->vtnet_features = negotiated_features; 712 sc->vtnet_negotiated_features = negotiated_features; 713 714 return (virtio_finalize_features(dev)); 715 } 716 717 static int 718 vtnet_setup_features(struct vtnet_softc *sc) 719 { 720 device_t dev; 721 int error; 722 723 dev = sc->vtnet_dev; 724 725 error = vtnet_negotiate_features(sc); 726 if (error) 727 return (error); 728 729 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 730 sc->vtnet_flags |= VTNET_FLAG_MODERN; 731 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 732 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 733 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 734 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 735 736 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 737 /* This feature should always be negotiated. */ 738 sc->vtnet_flags |= VTNET_FLAG_MAC; 739 } 740 741 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 742 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 743 offsetof(struct virtio_net_config, mtu)); 744 } else 745 sc->vtnet_max_mtu = VTNET_MAX_MTU; 746 747 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 748 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 750 } else if (vtnet_modern(sc)) { 751 /* This is identical to the mergeable header. */ 752 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 753 } else 754 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 755 756 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 757 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 758 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 759 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 760 else 761 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 762 763 /* 764 * Favor "hardware" LRO if negotiated, but support software LRO as 765 * a fallback; there is usually little benefit (or worse) with both. 766 */ 767 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 768 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 769 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 770 771 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 772 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 773 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 774 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 775 else 776 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 777 778 sc->vtnet_req_vq_pairs = 1; 779 sc->vtnet_max_vq_pairs = 1; 780 781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 782 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 783 784 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 785 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 786 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 787 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 788 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 789 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 790 791 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 792 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 793 offsetof(struct virtio_net_config, 794 max_virtqueue_pairs)); 795 } 796 } 797 798 if (sc->vtnet_max_vq_pairs > 1) { 799 int req; 800 801 /* 802 * Limit the maximum number of requested queue pairs to the 803 * number of CPUs and the configured maximum. 804 */ 805 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 806 if (req < 0) 807 req = 1; 808 if (req == 0) 809 req = mp_ncpus; 810 if (req > sc->vtnet_max_vq_pairs) 811 req = sc->vtnet_max_vq_pairs; 812 if (req > mp_ncpus) 813 req = mp_ncpus; 814 if (req > 1) { 815 sc->vtnet_req_vq_pairs = req; 816 sc->vtnet_flags |= VTNET_FLAG_MQ; 817 } 818 } 819 820 return (0); 821 } 822 823 static int 824 vtnet_init_rxq(struct vtnet_softc *sc, int id) 825 { 826 struct vtnet_rxq *rxq; 827 828 rxq = &sc->vtnet_rxqs[id]; 829 830 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 831 device_get_nameunit(sc->vtnet_dev), id); 832 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 833 834 rxq->vtnrx_sc = sc; 835 rxq->vtnrx_id = id; 836 837 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 838 if (rxq->vtnrx_sg == NULL) 839 return (ENOMEM); 840 841 #if defined(INET) || defined(INET6) 842 if (vtnet_software_lro(sc)) { 843 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 844 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 845 return (ENOMEM); 846 } 847 #endif 848 849 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 850 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 851 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 852 853 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 854 } 855 856 static int 857 vtnet_init_txq(struct vtnet_softc *sc, int id) 858 { 859 struct vtnet_txq *txq; 860 861 txq = &sc->vtnet_txqs[id]; 862 863 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 864 device_get_nameunit(sc->vtnet_dev), id); 865 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 866 867 txq->vtntx_sc = sc; 868 txq->vtntx_id = id; 869 870 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 871 if (txq->vtntx_sg == NULL) 872 return (ENOMEM); 873 874 #ifndef VTNET_LEGACY_TX 875 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 876 M_NOWAIT, &txq->vtntx_mtx); 877 if (txq->vtntx_br == NULL) 878 return (ENOMEM); 879 880 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 881 #endif 882 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 883 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 884 taskqueue_thread_enqueue, &txq->vtntx_tq); 885 if (txq->vtntx_tq == NULL) 886 return (ENOMEM); 887 888 return (0); 889 } 890 891 static int 892 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 893 { 894 int i, npairs, error; 895 896 npairs = sc->vtnet_max_vq_pairs; 897 898 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 899 M_NOWAIT | M_ZERO); 900 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 901 M_NOWAIT | M_ZERO); 902 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 903 return (ENOMEM); 904 905 for (i = 0; i < npairs; i++) { 906 error = vtnet_init_rxq(sc, i); 907 if (error) 908 return (error); 909 error = vtnet_init_txq(sc, i); 910 if (error) 911 return (error); 912 } 913 914 vtnet_set_rx_process_limit(sc); 915 vtnet_setup_queue_sysctl(sc); 916 917 return (0); 918 } 919 920 static void 921 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 922 { 923 924 rxq->vtnrx_sc = NULL; 925 rxq->vtnrx_id = -1; 926 927 #if defined(INET) || defined(INET6) 928 tcp_lro_free(&rxq->vtnrx_lro); 929 #endif 930 931 if (rxq->vtnrx_sg != NULL) { 932 sglist_free(rxq->vtnrx_sg); 933 rxq->vtnrx_sg = NULL; 934 } 935 936 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 937 mtx_destroy(&rxq->vtnrx_mtx); 938 } 939 940 static void 941 vtnet_destroy_txq(struct vtnet_txq *txq) 942 { 943 944 txq->vtntx_sc = NULL; 945 txq->vtntx_id = -1; 946 947 if (txq->vtntx_sg != NULL) { 948 sglist_free(txq->vtntx_sg); 949 txq->vtntx_sg = NULL; 950 } 951 952 #ifndef VTNET_LEGACY_TX 953 if (txq->vtntx_br != NULL) { 954 buf_ring_free(txq->vtntx_br, M_DEVBUF); 955 txq->vtntx_br = NULL; 956 } 957 #endif 958 959 if (mtx_initialized(&txq->vtntx_mtx) != 0) 960 mtx_destroy(&txq->vtntx_mtx); 961 } 962 963 static void 964 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 965 { 966 int i; 967 968 if (sc->vtnet_rxqs != NULL) { 969 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 970 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 971 free(sc->vtnet_rxqs, M_DEVBUF); 972 sc->vtnet_rxqs = NULL; 973 } 974 975 if (sc->vtnet_txqs != NULL) { 976 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 977 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 978 free(sc->vtnet_txqs, M_DEVBUF); 979 sc->vtnet_txqs = NULL; 980 } 981 } 982 983 static int 984 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 985 { 986 987 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 988 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 989 M_DEVBUF, M_NOWAIT | M_ZERO); 990 if (sc->vtnet_mac_filter == NULL) 991 return (ENOMEM); 992 } 993 994 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 995 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 996 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 997 if (sc->vtnet_vlan_filter == NULL) 998 return (ENOMEM); 999 } 1000 1001 return (0); 1002 } 1003 1004 static void 1005 vtnet_free_rx_filters(struct vtnet_softc *sc) 1006 { 1007 1008 if (sc->vtnet_mac_filter != NULL) { 1009 free(sc->vtnet_mac_filter, M_DEVBUF); 1010 sc->vtnet_mac_filter = NULL; 1011 } 1012 1013 if (sc->vtnet_vlan_filter != NULL) { 1014 free(sc->vtnet_vlan_filter, M_DEVBUF); 1015 sc->vtnet_vlan_filter = NULL; 1016 } 1017 } 1018 1019 static int 1020 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1021 { 1022 device_t dev; 1023 struct vq_alloc_info *info; 1024 struct vtnet_rxq *rxq; 1025 struct vtnet_txq *txq; 1026 int i, idx, nvqs, error; 1027 1028 dev = sc->vtnet_dev; 1029 1030 nvqs = sc->vtnet_max_vq_pairs * 2; 1031 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1032 nvqs++; 1033 1034 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1035 if (info == NULL) 1036 return (ENOMEM); 1037 1038 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1039 rxq = &sc->vtnet_rxqs[i]; 1040 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1041 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1042 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1043 1044 txq = &sc->vtnet_txqs[i]; 1045 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1046 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1047 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1048 } 1049 1050 /* These queues will not be used so allocate the minimum resources. */ 1051 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1052 rxq = &sc->vtnet_rxqs[i]; 1053 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1054 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1055 1056 txq = &sc->vtnet_txqs[i]; 1057 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1058 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1059 } 1060 1061 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1062 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1063 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1064 } 1065 1066 error = virtio_alloc_virtqueues(dev, nvqs, info); 1067 free(info, M_TEMP); 1068 1069 return (error); 1070 } 1071 1072 static int 1073 vtnet_alloc_interface(struct vtnet_softc *sc) 1074 { 1075 device_t dev; 1076 if_t ifp; 1077 1078 dev = sc->vtnet_dev; 1079 1080 ifp = if_alloc(IFT_ETHER); 1081 if (ifp == NULL) 1082 return (ENOMEM); 1083 1084 sc->vtnet_ifp = ifp; 1085 if_setsoftc(ifp, sc); 1086 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1087 1088 return (0); 1089 } 1090 1091 static int 1092 vtnet_setup_interface(struct vtnet_softc *sc) 1093 { 1094 device_t dev; 1095 struct pfil_head_args pa; 1096 if_t ifp; 1097 1098 dev = sc->vtnet_dev; 1099 ifp = sc->vtnet_ifp; 1100 1101 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1102 if_setbaudrate(ifp, IF_Gbps(10)); 1103 if_setinitfn(ifp, vtnet_init); 1104 if_setioctlfn(ifp, vtnet_ioctl); 1105 if_setgetcounterfn(ifp, vtnet_get_counter); 1106 #ifndef VTNET_LEGACY_TX 1107 if_settransmitfn(ifp, vtnet_txq_mq_start); 1108 if_setqflushfn(ifp, vtnet_qflush); 1109 #else 1110 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1111 if_setstartfn(ifp, vtnet_start); 1112 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1113 if_setsendqready(ifp); 1114 #endif 1115 1116 vtnet_get_macaddr(sc); 1117 1118 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1119 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1120 1121 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1122 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1123 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1124 1125 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1126 int gso; 1127 1128 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1129 1130 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1131 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1132 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1133 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1134 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1135 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1136 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1137 1138 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1139 int tso_maxlen; 1140 1141 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1142 1143 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1144 vtnet_tso_maxlen); 1145 if_sethwtsomax(ifp, tso_maxlen - 1146 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1147 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1148 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1149 } 1150 } 1151 1152 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1153 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1154 #ifdef notyet 1155 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1156 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1157 #endif 1158 1159 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1160 vtnet_fixup_needs_csum) != 0) 1161 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1162 1163 /* Support either "hardware" or software LRO. */ 1164 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1165 } 1166 1167 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1168 /* 1169 * VirtIO does not support VLAN tagging, but we can fake 1170 * it by inserting and removing the 802.1Q header during 1171 * transmit and receive. We are then able to do checksum 1172 * offloading of VLAN frames. 1173 */ 1174 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1175 } 1176 1177 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1178 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1179 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1180 1181 /* 1182 * Capabilities after here are not enabled by default. 1183 */ 1184 if_setcapenable(ifp, if_getcapabilities(ifp)); 1185 1186 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1187 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1188 1189 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1190 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1191 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1192 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1193 } 1194 1195 ether_ifattach(ifp, sc->vtnet_hwaddr); 1196 1197 /* Tell the upper layer(s) we support long frames. */ 1198 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1199 1200 DEBUGNET_SET(ifp, vtnet); 1201 1202 pa.pa_version = PFIL_VERSION; 1203 pa.pa_flags = PFIL_IN; 1204 pa.pa_type = PFIL_TYPE_ETHERNET; 1205 pa.pa_headname = if_name(ifp); 1206 sc->vtnet_pfil = pfil_head_register(&pa); 1207 1208 return (0); 1209 } 1210 1211 static int 1212 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1213 { 1214 int framesz; 1215 1216 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1217 return (MJUMPAGESIZE); 1218 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1219 return (MCLBYTES); 1220 1221 /* 1222 * Try to scale the receive mbuf cluster size from the MTU. We 1223 * could also use the VQ size to influence the selected size, 1224 * but that would only matter for very small queues. 1225 */ 1226 if (vtnet_modern(sc)) { 1227 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1228 framesz = sizeof(struct virtio_net_hdr_v1); 1229 } else 1230 framesz = sizeof(struct vtnet_rx_header); 1231 framesz += sizeof(struct ether_vlan_header) + mtu; 1232 /* 1233 * Account for the offsetting we'll do elsewhere so we allocate the 1234 * right size for the mtu. 1235 */ 1236 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1237 framesz += VTNET_ETHER_ALIGN; 1238 } 1239 1240 if (framesz <= MCLBYTES) 1241 return (MCLBYTES); 1242 else if (framesz <= MJUMPAGESIZE) 1243 return (MJUMPAGESIZE); 1244 else if (framesz <= MJUM9BYTES) 1245 return (MJUM9BYTES); 1246 1247 /* Sane default; avoid 16KB clusters. */ 1248 return (MCLBYTES); 1249 } 1250 1251 static int 1252 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1253 { 1254 if_t ifp; 1255 int clustersz; 1256 1257 ifp = sc->vtnet_ifp; 1258 VTNET_CORE_LOCK_ASSERT(sc); 1259 1260 if (if_getmtu(ifp) == mtu) 1261 return (0); 1262 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1263 return (EINVAL); 1264 1265 if_setmtu(ifp, mtu); 1266 clustersz = vtnet_rx_cluster_size(sc, mtu); 1267 1268 if (clustersz != sc->vtnet_rx_clustersz && 1269 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1270 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1271 vtnet_init_locked(sc, 0); 1272 } 1273 1274 return (0); 1275 } 1276 1277 static int 1278 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1279 { 1280 if_t ifp; 1281 int drv_running; 1282 1283 ifp = sc->vtnet_ifp; 1284 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1285 1286 VTNET_CORE_LOCK_ASSERT(sc); 1287 1288 if ((if_getflags(ifp) & IFF_UP) == 0) { 1289 if (drv_running) 1290 vtnet_stop(sc); 1291 goto out; 1292 } 1293 1294 if (!drv_running) { 1295 vtnet_init_locked(sc, 0); 1296 goto out; 1297 } 1298 1299 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1300 (IFF_PROMISC | IFF_ALLMULTI)) { 1301 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1302 vtnet_rx_filter(sc); 1303 else { 1304 /* 1305 * We don't support filtering out multicast, so 1306 * ALLMULTI is always set. 1307 */ 1308 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1309 if_setflagbits(ifp, IFF_PROMISC, 0); 1310 } 1311 } 1312 1313 out: 1314 sc->vtnet_if_flags = if_getflags(ifp); 1315 return (0); 1316 } 1317 1318 static int 1319 vtnet_ioctl_multi(struct vtnet_softc *sc) 1320 { 1321 if_t ifp; 1322 1323 ifp = sc->vtnet_ifp; 1324 1325 VTNET_CORE_LOCK_ASSERT(sc); 1326 1327 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1328 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1329 vtnet_rx_filter_mac(sc); 1330 1331 return (0); 1332 } 1333 1334 static int 1335 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1336 { 1337 if_t ifp; 1338 int mask, reinit, update; 1339 1340 ifp = sc->vtnet_ifp; 1341 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1342 reinit = update = 0; 1343 1344 VTNET_CORE_LOCK_ASSERT(sc); 1345 1346 if (mask & IFCAP_TXCSUM) 1347 if_togglecapenable(ifp, IFCAP_TXCSUM); 1348 if (mask & IFCAP_TXCSUM_IPV6) 1349 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1350 if (mask & IFCAP_TSO4) 1351 if_togglecapenable(ifp, IFCAP_TSO4); 1352 if (mask & IFCAP_TSO6) 1353 if_togglecapenable(ifp, IFCAP_TSO6); 1354 1355 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1356 /* 1357 * These Rx features require the negotiated features to 1358 * be updated. Avoid a full reinit if possible. 1359 */ 1360 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1361 update = 1; 1362 else 1363 reinit = 1; 1364 1365 /* BMV: Avoid needless renegotiation for just software LRO. */ 1366 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1367 IFCAP_LRO && vtnet_software_lro(sc)) 1368 reinit = update = 0; 1369 1370 if (mask & IFCAP_RXCSUM) 1371 if_togglecapenable(ifp, IFCAP_RXCSUM); 1372 if (mask & IFCAP_RXCSUM_IPV6) 1373 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1374 if (mask & IFCAP_LRO) 1375 if_togglecapenable(ifp, IFCAP_LRO); 1376 1377 /* 1378 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1379 * so treat them as a pair. Guest TSO (LRO) requires receive 1380 * checksums. 1381 */ 1382 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1383 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1384 #ifdef notyet 1385 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1386 #endif 1387 } else 1388 if_setcapenablebit(ifp, 0, 1389 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1390 } 1391 1392 if (mask & IFCAP_VLAN_HWFILTER) { 1393 /* These Rx features require renegotiation. */ 1394 reinit = 1; 1395 1396 if (mask & IFCAP_VLAN_HWFILTER) 1397 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1398 } 1399 1400 if (mask & IFCAP_VLAN_HWTSO) 1401 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1402 if (mask & IFCAP_VLAN_HWTAGGING) 1403 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1404 1405 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1406 if (reinit) { 1407 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1408 vtnet_init_locked(sc, 0); 1409 } else if (update) 1410 vtnet_update_rx_offloads(sc); 1411 } 1412 1413 return (0); 1414 } 1415 1416 static int 1417 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1418 { 1419 struct vtnet_softc *sc; 1420 struct ifreq *ifr; 1421 int error; 1422 1423 sc = if_getsoftc(ifp); 1424 ifr = (struct ifreq *) data; 1425 error = 0; 1426 1427 switch (cmd) { 1428 case SIOCSIFMTU: 1429 VTNET_CORE_LOCK(sc); 1430 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1431 VTNET_CORE_UNLOCK(sc); 1432 break; 1433 1434 case SIOCSIFFLAGS: 1435 VTNET_CORE_LOCK(sc); 1436 error = vtnet_ioctl_ifflags(sc); 1437 VTNET_CORE_UNLOCK(sc); 1438 break; 1439 1440 case SIOCADDMULTI: 1441 case SIOCDELMULTI: 1442 VTNET_CORE_LOCK(sc); 1443 error = vtnet_ioctl_multi(sc); 1444 VTNET_CORE_UNLOCK(sc); 1445 break; 1446 1447 case SIOCSIFMEDIA: 1448 case SIOCGIFMEDIA: 1449 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1450 break; 1451 1452 case SIOCSIFCAP: 1453 VTNET_CORE_LOCK(sc); 1454 error = vtnet_ioctl_ifcap(sc, ifr); 1455 VTNET_CORE_UNLOCK(sc); 1456 VLAN_CAPABILITIES(ifp); 1457 break; 1458 1459 default: 1460 error = ether_ioctl(ifp, cmd, data); 1461 break; 1462 } 1463 1464 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1465 1466 return (error); 1467 } 1468 1469 static int 1470 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1471 { 1472 struct virtqueue *vq; 1473 int nbufs, error; 1474 1475 #ifdef DEV_NETMAP 1476 error = vtnet_netmap_rxq_populate(rxq); 1477 if (error >= 0) 1478 return (error); 1479 #endif /* DEV_NETMAP */ 1480 1481 vq = rxq->vtnrx_vq; 1482 error = ENOSPC; 1483 1484 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1485 error = vtnet_rxq_new_buf(rxq); 1486 if (error) 1487 break; 1488 } 1489 1490 if (nbufs > 0) { 1491 virtqueue_notify(vq); 1492 /* 1493 * EMSGSIZE signifies the virtqueue did not have enough 1494 * entries available to hold the last mbuf. This is not 1495 * an error. 1496 */ 1497 if (error == EMSGSIZE) 1498 error = 0; 1499 } 1500 1501 return (error); 1502 } 1503 1504 static void 1505 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1506 { 1507 struct virtqueue *vq; 1508 struct mbuf *m; 1509 int last; 1510 #ifdef DEV_NETMAP 1511 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1512 rxq->vtnrx_id, NR_RX); 1513 #else /* !DEV_NETMAP */ 1514 void *kring = NULL; 1515 #endif /* !DEV_NETMAP */ 1516 1517 vq = rxq->vtnrx_vq; 1518 last = 0; 1519 1520 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1521 if (kring == NULL) 1522 m_freem(m); 1523 } 1524 1525 KASSERT(virtqueue_empty(vq), 1526 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1527 } 1528 1529 static struct mbuf * 1530 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1531 { 1532 struct mbuf *m_head, *m_tail, *m; 1533 int i, size; 1534 1535 m_head = NULL; 1536 size = sc->vtnet_rx_clustersz; 1537 1538 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1539 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1540 1541 for (i = 0; i < nbufs; i++) { 1542 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1543 if (m == NULL) { 1544 sc->vtnet_stats.mbuf_alloc_failed++; 1545 m_freem(m_head); 1546 return (NULL); 1547 } 1548 1549 m->m_len = size; 1550 /* 1551 * Need to offset the mbuf if the header we're going to add 1552 * will misalign. 1553 */ 1554 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1555 m_adj(m, VTNET_ETHER_ALIGN); 1556 } 1557 if (m_head != NULL) { 1558 m_tail->m_next = m; 1559 m_tail = m; 1560 } else 1561 m_head = m_tail = m; 1562 } 1563 1564 if (m_tailp != NULL) 1565 *m_tailp = m_tail; 1566 1567 return (m_head); 1568 } 1569 1570 /* 1571 * Slow path for when LRO without mergeable buffers is negotiated. 1572 */ 1573 static int 1574 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1575 int len0) 1576 { 1577 struct vtnet_softc *sc; 1578 struct mbuf *m, *m_prev, *m_new, *m_tail; 1579 int len, clustersz, nreplace, error; 1580 1581 sc = rxq->vtnrx_sc; 1582 clustersz = sc->vtnet_rx_clustersz; 1583 /* 1584 * Need to offset the mbuf if the header we're going to add will 1585 * misalign, account for that here. 1586 */ 1587 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) 1588 clustersz -= VTNET_ETHER_ALIGN; 1589 1590 m_prev = NULL; 1591 m_tail = NULL; 1592 nreplace = 0; 1593 1594 m = m0; 1595 len = len0; 1596 1597 /* 1598 * Since these mbuf chains are so large, avoid allocating a complete 1599 * replacement when the received frame did not consume the entire 1600 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1601 */ 1602 while (len > 0) { 1603 if (m == NULL) { 1604 sc->vtnet_stats.rx_frame_too_large++; 1605 return (EMSGSIZE); 1606 } 1607 1608 /* 1609 * Every mbuf should have the expected cluster size since that 1610 * is also used to allocate the replacements. 1611 */ 1612 KASSERT(m->m_len == clustersz, 1613 ("%s: mbuf size %d not expected cluster size %d", __func__, 1614 m->m_len, clustersz)); 1615 1616 m->m_len = MIN(m->m_len, len); 1617 len -= m->m_len; 1618 1619 m_prev = m; 1620 m = m->m_next; 1621 nreplace++; 1622 } 1623 1624 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1625 ("%s: invalid replacement mbuf count %d max %d", __func__, 1626 nreplace, sc->vtnet_rx_nmbufs)); 1627 1628 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1629 if (m_new == NULL) { 1630 m_prev->m_len = clustersz; 1631 return (ENOBUFS); 1632 } 1633 1634 /* 1635 * Move any unused mbufs from the received mbuf chain onto the 1636 * end of the replacement chain. 1637 */ 1638 if (m_prev->m_next != NULL) { 1639 m_tail->m_next = m_prev->m_next; 1640 m_prev->m_next = NULL; 1641 } 1642 1643 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1644 if (error) { 1645 /* 1646 * The replacement is suppose to be an copy of the one 1647 * dequeued so this is a very unexpected error. 1648 * 1649 * Restore the m0 chain to the original state if it was 1650 * modified so we can then discard it. 1651 */ 1652 if (m_tail->m_next != NULL) { 1653 m_prev->m_next = m_tail->m_next; 1654 m_tail->m_next = NULL; 1655 } 1656 m_prev->m_len = clustersz; 1657 sc->vtnet_stats.rx_enq_replacement_failed++; 1658 m_freem(m_new); 1659 } 1660 1661 return (error); 1662 } 1663 1664 static int 1665 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1666 { 1667 struct vtnet_softc *sc; 1668 struct mbuf *m_new; 1669 int error; 1670 1671 sc = rxq->vtnrx_sc; 1672 1673 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1674 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1675 1676 MPASS(m->m_next == NULL); 1677 if (m->m_len < len) 1678 return (EMSGSIZE); 1679 1680 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1681 if (m_new == NULL) 1682 return (ENOBUFS); 1683 1684 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1685 if (error) { 1686 sc->vtnet_stats.rx_enq_replacement_failed++; 1687 m_freem(m_new); 1688 } else 1689 m->m_len = len; 1690 1691 return (error); 1692 } 1693 1694 static int 1695 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1696 { 1697 struct vtnet_softc *sc; 1698 struct sglist *sg; 1699 int header_inlined, error; 1700 1701 sc = rxq->vtnrx_sc; 1702 sg = rxq->vtnrx_sg; 1703 1704 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1705 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1706 VTNET_RXQ_LOCK_ASSERT(rxq); 1707 1708 sglist_reset(sg); 1709 header_inlined = vtnet_modern(sc) || 1710 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1711 1712 /* 1713 * Note: The mbuf has been already adjusted when we allocate it if we 1714 * have to do strict alignment. 1715 */ 1716 if (header_inlined) 1717 error = sglist_append_mbuf(sg, m); 1718 else { 1719 struct vtnet_rx_header *rxhdr = 1720 mtod(m, struct vtnet_rx_header *); 1721 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1722 1723 /* Append the header and remaining mbuf data. */ 1724 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1725 if (error) 1726 return (error); 1727 error = sglist_append(sg, &rxhdr[1], 1728 m->m_len - sizeof(struct vtnet_rx_header)); 1729 if (error) 1730 return (error); 1731 1732 if (m->m_next != NULL) 1733 error = sglist_append_mbuf(sg, m->m_next); 1734 } 1735 1736 if (error) 1737 return (error); 1738 1739 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1740 } 1741 1742 static int 1743 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1744 { 1745 struct vtnet_softc *sc; 1746 struct mbuf *m; 1747 int error; 1748 1749 sc = rxq->vtnrx_sc; 1750 1751 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1752 if (m == NULL) 1753 return (ENOBUFS); 1754 1755 error = vtnet_rxq_enqueue_buf(rxq, m); 1756 if (error) 1757 m_freem(m); 1758 1759 return (error); 1760 } 1761 1762 static int 1763 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1764 int hoff, struct virtio_net_hdr *hdr) 1765 { 1766 struct vtnet_softc *sc; 1767 int error; 1768 1769 sc = rxq->vtnrx_sc; 1770 1771 /* 1772 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1773 * not have an analogous CSUM flag. The checksum has been validated, 1774 * but is incomplete (TCP/UDP pseudo header). 1775 * 1776 * The packet is likely from another VM on the same host that itself 1777 * performed checksum offloading so Tx/Rx is basically a memcpy and 1778 * the checksum has little value. 1779 * 1780 * Default to receiving the packet as-is for performance reasons, but 1781 * this can cause issues if the packet is to be forwarded because it 1782 * does not contain a valid checksum. This patch may be helpful: 1783 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1784 * compute the checksum if requested. 1785 * 1786 * BMV: Need to add an CSUM_PARTIAL flag? 1787 */ 1788 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1789 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1790 return (error); 1791 } 1792 1793 /* 1794 * Compute the checksum in the driver so the packet will contain a 1795 * valid checksum. The checksum is at csum_offset from csum_start. 1796 */ 1797 switch (etype) { 1798 #if defined(INET) || defined(INET6) 1799 case ETHERTYPE_IP: 1800 case ETHERTYPE_IPV6: { 1801 int csum_off, csum_end; 1802 uint16_t csum; 1803 1804 csum_off = hdr->csum_start + hdr->csum_offset; 1805 csum_end = csum_off + sizeof(uint16_t); 1806 1807 /* Assume checksum will be in the first mbuf. */ 1808 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1809 return (1); 1810 1811 /* 1812 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1813 * checksum and write it at the specified offset. We could 1814 * try to verify the packet: csum_start should probably 1815 * correspond to the start of the TCP/UDP header. 1816 * 1817 * BMV: Need to properly handle UDP with zero checksum. Is 1818 * the IPv4 header checksum implicitly validated? 1819 */ 1820 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1821 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1822 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1823 m->m_pkthdr.csum_data = 0xFFFF; 1824 break; 1825 } 1826 #endif 1827 default: 1828 sc->vtnet_stats.rx_csum_bad_ethtype++; 1829 return (1); 1830 } 1831 1832 return (0); 1833 } 1834 1835 static int 1836 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1837 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1838 { 1839 #if 0 1840 struct vtnet_softc *sc; 1841 #endif 1842 int protocol; 1843 1844 #if 0 1845 sc = rxq->vtnrx_sc; 1846 #endif 1847 1848 switch (etype) { 1849 #if defined(INET) 1850 case ETHERTYPE_IP: 1851 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1852 protocol = IPPROTO_DONE; 1853 else { 1854 struct ip *ip = (struct ip *)(m->m_data + hoff); 1855 protocol = ip->ip_p; 1856 } 1857 break; 1858 #endif 1859 #if defined(INET6) 1860 case ETHERTYPE_IPV6: 1861 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1862 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1863 protocol = IPPROTO_DONE; 1864 break; 1865 #endif 1866 default: 1867 protocol = IPPROTO_DONE; 1868 break; 1869 } 1870 1871 switch (protocol) { 1872 case IPPROTO_TCP: 1873 case IPPROTO_UDP: 1874 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1875 m->m_pkthdr.csum_data = 0xFFFF; 1876 break; 1877 default: 1878 /* 1879 * FreeBSD does not support checksum offloading of this 1880 * protocol. Let the stack re-verify the checksum later 1881 * if the protocol is supported. 1882 */ 1883 #if 0 1884 if_printf(sc->vtnet_ifp, 1885 "%s: checksum offload of unsupported protocol " 1886 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1887 __func__, etype, protocol, hdr->csum_start, 1888 hdr->csum_offset); 1889 #endif 1890 break; 1891 } 1892 1893 return (0); 1894 } 1895 1896 static int 1897 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1898 struct virtio_net_hdr *hdr) 1899 { 1900 const struct ether_header *eh; 1901 int hoff; 1902 uint16_t etype; 1903 1904 eh = mtod(m, const struct ether_header *); 1905 etype = ntohs(eh->ether_type); 1906 if (etype == ETHERTYPE_VLAN) { 1907 /* TODO BMV: Handle QinQ. */ 1908 const struct ether_vlan_header *evh = 1909 mtod(m, const struct ether_vlan_header *); 1910 etype = ntohs(evh->evl_proto); 1911 hoff = sizeof(struct ether_vlan_header); 1912 } else 1913 hoff = sizeof(struct ether_header); 1914 1915 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1916 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1917 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1918 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1919 } 1920 1921 static void 1922 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1923 { 1924 struct mbuf *m; 1925 1926 while (--nbufs > 0) { 1927 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1928 if (m == NULL) 1929 break; 1930 vtnet_rxq_discard_buf(rxq, m); 1931 } 1932 } 1933 1934 static void 1935 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1936 { 1937 int error __diagused; 1938 1939 /* 1940 * Requeue the discarded mbuf. This should always be successful 1941 * since it was just dequeued. 1942 */ 1943 error = vtnet_rxq_enqueue_buf(rxq, m); 1944 KASSERT(error == 0, 1945 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1946 } 1947 1948 static int 1949 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1950 { 1951 struct vtnet_softc *sc; 1952 struct virtqueue *vq; 1953 struct mbuf *m_tail; 1954 1955 sc = rxq->vtnrx_sc; 1956 vq = rxq->vtnrx_vq; 1957 m_tail = m_head; 1958 1959 while (--nbufs > 0) { 1960 struct mbuf *m; 1961 uint32_t len; 1962 1963 m = virtqueue_dequeue(vq, &len); 1964 if (m == NULL) { 1965 rxq->vtnrx_stats.vrxs_ierrors++; 1966 goto fail; 1967 } 1968 1969 if (vtnet_rxq_new_buf(rxq) != 0) { 1970 rxq->vtnrx_stats.vrxs_iqdrops++; 1971 vtnet_rxq_discard_buf(rxq, m); 1972 if (nbufs > 1) 1973 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1974 goto fail; 1975 } 1976 1977 if (m->m_len < len) 1978 len = m->m_len; 1979 1980 m->m_len = len; 1981 m->m_flags &= ~M_PKTHDR; 1982 1983 m_head->m_pkthdr.len += len; 1984 m_tail->m_next = m; 1985 m_tail = m; 1986 } 1987 1988 return (0); 1989 1990 fail: 1991 sc->vtnet_stats.rx_mergeable_failed++; 1992 m_freem(m_head); 1993 1994 return (1); 1995 } 1996 1997 #if defined(INET) || defined(INET6) 1998 static int 1999 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 2000 { 2001 struct lro_ctrl *lro; 2002 2003 lro = &rxq->vtnrx_lro; 2004 2005 if (lro->lro_mbuf_max != 0) { 2006 tcp_lro_queue_mbuf(lro, m); 2007 return (0); 2008 } 2009 2010 return (tcp_lro_rx(lro, m, 0)); 2011 } 2012 #endif 2013 2014 static void 2015 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2016 struct virtio_net_hdr *hdr) 2017 { 2018 struct vtnet_softc *sc; 2019 if_t ifp; 2020 2021 sc = rxq->vtnrx_sc; 2022 ifp = sc->vtnet_ifp; 2023 2024 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2025 struct ether_header *eh = mtod(m, struct ether_header *); 2026 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2027 vtnet_vlan_tag_remove(m); 2028 /* 2029 * With the 802.1Q header removed, update the 2030 * checksum starting location accordingly. 2031 */ 2032 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2033 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2034 } 2035 } 2036 2037 m->m_pkthdr.flowid = rxq->vtnrx_id; 2038 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2039 2040 if (hdr->flags & 2041 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2042 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2043 rxq->vtnrx_stats.vrxs_csum++; 2044 else 2045 rxq->vtnrx_stats.vrxs_csum_failed++; 2046 } 2047 2048 if (hdr->gso_size != 0) { 2049 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2050 case VIRTIO_NET_HDR_GSO_TCPV4: 2051 case VIRTIO_NET_HDR_GSO_TCPV6: 2052 m->m_pkthdr.lro_nsegs = 2053 howmany(m->m_pkthdr.len, hdr->gso_size); 2054 rxq->vtnrx_stats.vrxs_host_lro++; 2055 break; 2056 } 2057 } 2058 2059 rxq->vtnrx_stats.vrxs_ipackets++; 2060 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2061 2062 #if defined(INET) || defined(INET6) 2063 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2064 if (vtnet_lro_rx(rxq, m) == 0) 2065 return; 2066 } 2067 #endif 2068 2069 if_input(ifp, m); 2070 } 2071 2072 static int 2073 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2074 { 2075 struct virtio_net_hdr lhdr, *hdr; 2076 struct vtnet_softc *sc; 2077 if_t ifp; 2078 struct virtqueue *vq; 2079 int deq, count; 2080 2081 sc = rxq->vtnrx_sc; 2082 vq = rxq->vtnrx_vq; 2083 ifp = sc->vtnet_ifp; 2084 deq = 0; 2085 count = sc->vtnet_rx_process_limit; 2086 2087 VTNET_RXQ_LOCK_ASSERT(rxq); 2088 2089 CURVNET_SET(if_getvnet(ifp)); 2090 while (count-- > 0) { 2091 struct mbuf *m; 2092 uint32_t len, nbufs, adjsz; 2093 2094 m = virtqueue_dequeue(vq, &len); 2095 if (m == NULL) 2096 break; 2097 deq++; 2098 2099 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2100 rxq->vtnrx_stats.vrxs_ierrors++; 2101 vtnet_rxq_discard_buf(rxq, m); 2102 continue; 2103 } 2104 2105 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2106 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2107 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2108 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2109 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2110 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2111 } else if (vtnet_modern(sc)) { 2112 nbufs = 1; /* num_buffers is always 1 */ 2113 adjsz = sizeof(struct virtio_net_hdr_v1); 2114 } else { 2115 nbufs = 1; 2116 adjsz = sizeof(struct vtnet_rx_header); 2117 /* 2118 * Account for our gap between the header and start of 2119 * data to keep the segments separated. 2120 */ 2121 len += VTNET_RX_HEADER_PAD; 2122 } 2123 2124 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2125 rxq->vtnrx_stats.vrxs_iqdrops++; 2126 vtnet_rxq_discard_buf(rxq, m); 2127 if (nbufs > 1) 2128 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2129 continue; 2130 } 2131 2132 m->m_pkthdr.len = len; 2133 m->m_pkthdr.rcvif = ifp; 2134 m->m_pkthdr.csum_flags = 0; 2135 2136 if (nbufs > 1) { 2137 /* Dequeue the rest of chain. */ 2138 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2139 continue; 2140 } 2141 2142 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2143 2144 /* 2145 * Save an endian swapped version of the header prior to it 2146 * being stripped. The header is always at the start of the 2147 * mbuf data. num_buffers was already saved (and not needed) 2148 * so use the standard header. 2149 */ 2150 hdr = mtod(m, struct virtio_net_hdr *); 2151 lhdr.flags = hdr->flags; 2152 lhdr.gso_type = hdr->gso_type; 2153 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2154 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2155 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2156 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2157 m_adj(m, adjsz); 2158 2159 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2160 pfil_return_t pfil; 2161 2162 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2163 switch (pfil) { 2164 case PFIL_DROPPED: 2165 case PFIL_CONSUMED: 2166 continue; 2167 default: 2168 KASSERT(pfil == PFIL_PASS, 2169 ("Filter returned %d!", pfil)); 2170 } 2171 } 2172 2173 vtnet_rxq_input(rxq, m, &lhdr); 2174 } 2175 2176 if (deq > 0) { 2177 #if defined(INET) || defined(INET6) 2178 if (vtnet_software_lro(sc)) 2179 tcp_lro_flush_all(&rxq->vtnrx_lro); 2180 #endif 2181 virtqueue_notify(vq); 2182 } 2183 CURVNET_RESTORE(); 2184 2185 return (count > 0 ? 0 : EAGAIN); 2186 } 2187 2188 static void 2189 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2190 { 2191 struct vtnet_softc *sc; 2192 if_t ifp; 2193 u_int more; 2194 #ifdef DEV_NETMAP 2195 int nmirq; 2196 #endif /* DEV_NETMAP */ 2197 2198 sc = rxq->vtnrx_sc; 2199 ifp = sc->vtnet_ifp; 2200 2201 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2202 /* 2203 * Ignore this interrupt. Either this is a spurious interrupt 2204 * or multiqueue without per-VQ MSIX so every queue needs to 2205 * be polled (a brain dead configuration we could try harder 2206 * to avoid). 2207 */ 2208 vtnet_rxq_disable_intr(rxq); 2209 return; 2210 } 2211 2212 VTNET_RXQ_LOCK(rxq); 2213 2214 #ifdef DEV_NETMAP 2215 /* 2216 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2217 * This is not necessary to serialize the access to the RX vq, but 2218 * rather to avoid races that may happen if this interface is 2219 * attached to a VALE switch, which would cause received packets 2220 * to stall in the RX queue (nm_kr_tryget() could find the kring 2221 * busy when called from netmap_bwrap_intr_notify()). 2222 */ 2223 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2224 if (nmirq != NM_IRQ_PASS) { 2225 VTNET_RXQ_UNLOCK(rxq); 2226 if (nmirq == NM_IRQ_RESCHED) { 2227 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2228 } 2229 return; 2230 } 2231 #endif /* DEV_NETMAP */ 2232 2233 again: 2234 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2235 VTNET_RXQ_UNLOCK(rxq); 2236 return; 2237 } 2238 2239 more = vtnet_rxq_eof(rxq); 2240 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2241 if (!more) 2242 vtnet_rxq_disable_intr(rxq); 2243 /* 2244 * This is an occasional condition or race (when !more), 2245 * so retry a few times before scheduling the taskqueue. 2246 */ 2247 if (tries-- > 0) 2248 goto again; 2249 2250 rxq->vtnrx_stats.vrxs_rescheduled++; 2251 VTNET_RXQ_UNLOCK(rxq); 2252 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2253 } else 2254 VTNET_RXQ_UNLOCK(rxq); 2255 } 2256 2257 static void 2258 vtnet_rx_vq_intr(void *xrxq) 2259 { 2260 struct vtnet_rxq *rxq; 2261 2262 rxq = xrxq; 2263 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2264 } 2265 2266 static void 2267 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2268 { 2269 struct vtnet_rxq *rxq; 2270 2271 rxq = xrxq; 2272 vtnet_rx_vq_process(rxq, 0); 2273 } 2274 2275 static int 2276 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2277 { 2278 struct vtnet_softc *sc; 2279 int threshold; 2280 2281 sc = txq->vtntx_sc; 2282 2283 /* 2284 * The Tx interrupt is disabled until the queue free count falls 2285 * below our threshold. Completed frames are drained from the Tx 2286 * virtqueue before transmitting new frames and in the watchdog 2287 * callout, so the frequency of Tx interrupts is greatly reduced, 2288 * at the cost of not freeing mbufs as quickly as they otherwise 2289 * would be. 2290 */ 2291 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2292 2293 /* 2294 * Without indirect descriptors, leave enough room for the most 2295 * segments we handle. 2296 */ 2297 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2298 threshold < sc->vtnet_tx_nsegs) 2299 threshold = sc->vtnet_tx_nsegs; 2300 2301 return (threshold); 2302 } 2303 2304 static int 2305 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2306 { 2307 struct virtqueue *vq; 2308 2309 vq = txq->vtntx_vq; 2310 2311 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2312 } 2313 2314 static int 2315 vtnet_txq_notify(struct vtnet_txq *txq) 2316 { 2317 struct virtqueue *vq; 2318 2319 vq = txq->vtntx_vq; 2320 2321 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2322 virtqueue_notify(vq); 2323 2324 if (vtnet_txq_enable_intr(txq) == 0) 2325 return (0); 2326 2327 /* 2328 * Drain frames that were completed since last checked. If this 2329 * causes the queue to go above the threshold, the caller should 2330 * continue transmitting. 2331 */ 2332 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2333 virtqueue_disable_intr(vq); 2334 return (1); 2335 } 2336 2337 return (0); 2338 } 2339 2340 static void 2341 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2342 { 2343 struct virtqueue *vq; 2344 struct vtnet_tx_header *txhdr; 2345 int last; 2346 #ifdef DEV_NETMAP 2347 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2348 txq->vtntx_id, NR_TX); 2349 #else /* !DEV_NETMAP */ 2350 void *kring = NULL; 2351 #endif /* !DEV_NETMAP */ 2352 2353 vq = txq->vtntx_vq; 2354 last = 0; 2355 2356 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2357 if (kring == NULL) { 2358 m_freem(txhdr->vth_mbuf); 2359 uma_zfree(vtnet_tx_header_zone, txhdr); 2360 } 2361 } 2362 2363 KASSERT(virtqueue_empty(vq), 2364 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2365 } 2366 2367 /* 2368 * BMV: This can go away once we finally have offsets in the mbuf header. 2369 */ 2370 static int 2371 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2372 int *proto, int *start) 2373 { 2374 struct vtnet_softc *sc; 2375 struct ether_vlan_header *evh; 2376 #if defined(INET) || defined(INET6) 2377 int offset; 2378 #endif 2379 2380 sc = txq->vtntx_sc; 2381 2382 evh = mtod(m, struct ether_vlan_header *); 2383 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2384 /* BMV: We should handle nested VLAN tags too. */ 2385 *etype = ntohs(evh->evl_proto); 2386 #if defined(INET) || defined(INET6) 2387 offset = sizeof(struct ether_vlan_header); 2388 #endif 2389 } else { 2390 *etype = ntohs(evh->evl_encap_proto); 2391 #if defined(INET) || defined(INET6) 2392 offset = sizeof(struct ether_header); 2393 #endif 2394 } 2395 2396 switch (*etype) { 2397 #if defined(INET) 2398 case ETHERTYPE_IP: { 2399 struct ip *ip, iphdr; 2400 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2401 m_copydata(m, offset, sizeof(struct ip), 2402 (caddr_t) &iphdr); 2403 ip = &iphdr; 2404 } else 2405 ip = (struct ip *)(m->m_data + offset); 2406 *proto = ip->ip_p; 2407 *start = offset + (ip->ip_hl << 2); 2408 break; 2409 } 2410 #endif 2411 #if defined(INET6) 2412 case ETHERTYPE_IPV6: 2413 *proto = -1; 2414 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2415 /* Assert the network stack sent us a valid packet. */ 2416 KASSERT(*start > offset, 2417 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2418 *start, offset, *proto)); 2419 break; 2420 #endif 2421 default: 2422 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2423 return (EINVAL); 2424 } 2425 2426 return (0); 2427 } 2428 2429 static int 2430 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2431 int offset, struct virtio_net_hdr *hdr) 2432 { 2433 static struct timeval lastecn; 2434 static int curecn; 2435 struct vtnet_softc *sc; 2436 struct tcphdr *tcp, tcphdr; 2437 2438 sc = txq->vtntx_sc; 2439 2440 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2441 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2442 tcp = &tcphdr; 2443 } else 2444 tcp = (struct tcphdr *)(m->m_data + offset); 2445 2446 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2447 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2448 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2449 VIRTIO_NET_HDR_GSO_TCPV6; 2450 2451 if (__predict_false(tcp->th_flags & TH_CWR)) { 2452 /* 2453 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2454 * FreeBSD, ECN support is not on a per-interface basis, 2455 * but globally via the net.inet.tcp.ecn.enable sysctl 2456 * knob. The default is off. 2457 */ 2458 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2459 if (ppsratecheck(&lastecn, &curecn, 1)) 2460 if_printf(sc->vtnet_ifp, 2461 "TSO with ECN not negotiated with host\n"); 2462 return (ENOTSUP); 2463 } 2464 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2465 } 2466 2467 txq->vtntx_stats.vtxs_tso++; 2468 2469 return (0); 2470 } 2471 2472 static struct mbuf * 2473 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2474 struct virtio_net_hdr *hdr) 2475 { 2476 struct vtnet_softc *sc; 2477 int flags, etype, csum_start, proto, error; 2478 2479 sc = txq->vtntx_sc; 2480 flags = m->m_pkthdr.csum_flags; 2481 2482 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2483 if (error) 2484 goto drop; 2485 2486 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2487 /* Sanity check the parsed mbuf matches the offload flags. */ 2488 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2489 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2490 && etype != ETHERTYPE_IPV6))) { 2491 sc->vtnet_stats.tx_csum_proto_mismatch++; 2492 goto drop; 2493 } 2494 2495 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2496 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2497 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2498 txq->vtntx_stats.vtxs_csum++; 2499 } 2500 2501 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2502 /* 2503 * Sanity check the parsed mbuf IP protocol is TCP, and 2504 * VirtIO TSO reqires the checksum offloading above. 2505 */ 2506 if (__predict_false(proto != IPPROTO_TCP)) { 2507 sc->vtnet_stats.tx_tso_not_tcp++; 2508 goto drop; 2509 } else if (__predict_false((hdr->flags & 2510 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2511 sc->vtnet_stats.tx_tso_without_csum++; 2512 goto drop; 2513 } 2514 2515 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2516 if (error) 2517 goto drop; 2518 } 2519 2520 return (m); 2521 2522 drop: 2523 m_freem(m); 2524 return (NULL); 2525 } 2526 2527 static int 2528 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2529 struct vtnet_tx_header *txhdr) 2530 { 2531 struct vtnet_softc *sc; 2532 struct virtqueue *vq; 2533 struct sglist *sg; 2534 struct mbuf *m; 2535 int error; 2536 2537 sc = txq->vtntx_sc; 2538 vq = txq->vtntx_vq; 2539 sg = txq->vtntx_sg; 2540 m = *m_head; 2541 2542 sglist_reset(sg); 2543 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2544 if (error != 0 || sg->sg_nseg != 1) { 2545 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2546 __func__, error, sg->sg_nseg)); 2547 goto fail; 2548 } 2549 2550 error = sglist_append_mbuf(sg, m); 2551 if (error) { 2552 m = m_defrag(m, M_NOWAIT); 2553 if (m == NULL) 2554 goto fail; 2555 2556 *m_head = m; 2557 sc->vtnet_stats.tx_defragged++; 2558 2559 error = sglist_append_mbuf(sg, m); 2560 if (error) 2561 goto fail; 2562 } 2563 2564 txhdr->vth_mbuf = m; 2565 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2566 2567 return (error); 2568 2569 fail: 2570 sc->vtnet_stats.tx_defrag_failed++; 2571 m_freem(*m_head); 2572 *m_head = NULL; 2573 2574 return (ENOBUFS); 2575 } 2576 2577 static int 2578 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2579 { 2580 struct vtnet_tx_header *txhdr; 2581 struct virtio_net_hdr *hdr; 2582 struct mbuf *m; 2583 int error; 2584 2585 m = *m_head; 2586 M_ASSERTPKTHDR(m); 2587 2588 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2589 if (txhdr == NULL) { 2590 m_freem(m); 2591 *m_head = NULL; 2592 return (ENOMEM); 2593 } 2594 2595 /* 2596 * Always use the non-mergeable header, regardless if mergable headers 2597 * were negotiated, because for transmit num_buffers is always zero. 2598 * The vtnet_hdr_size is used to enqueue the right header size segment. 2599 */ 2600 hdr = &txhdr->vth_uhdr.hdr; 2601 2602 if (m->m_flags & M_VLANTAG) { 2603 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2604 if ((*m_head = m) == NULL) { 2605 error = ENOBUFS; 2606 goto fail; 2607 } 2608 m->m_flags &= ~M_VLANTAG; 2609 } 2610 2611 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2612 m = vtnet_txq_offload(txq, m, hdr); 2613 if ((*m_head = m) == NULL) { 2614 error = ENOBUFS; 2615 goto fail; 2616 } 2617 } 2618 2619 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2620 fail: 2621 if (error) 2622 uma_zfree(vtnet_tx_header_zone, txhdr); 2623 2624 return (error); 2625 } 2626 2627 #ifdef VTNET_LEGACY_TX 2628 2629 static void 2630 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2631 { 2632 struct vtnet_softc *sc; 2633 struct virtqueue *vq; 2634 struct mbuf *m0; 2635 int tries, enq; 2636 2637 sc = txq->vtntx_sc; 2638 vq = txq->vtntx_vq; 2639 tries = 0; 2640 2641 VTNET_TXQ_LOCK_ASSERT(txq); 2642 2643 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2644 sc->vtnet_link_active == 0) 2645 return; 2646 2647 vtnet_txq_eof(txq); 2648 2649 again: 2650 enq = 0; 2651 2652 while (!if_sendq_empty(ifp)) { 2653 if (virtqueue_full(vq)) 2654 break; 2655 2656 m0 = if_dequeue(ifp); 2657 if (m0 == NULL) 2658 break; 2659 2660 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2661 if (m0 != NULL) 2662 if_sendq_prepend(ifp, m0); 2663 break; 2664 } 2665 2666 enq++; 2667 ETHER_BPF_MTAP(ifp, m0); 2668 } 2669 2670 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2671 if (tries++ < VTNET_NOTIFY_RETRIES) 2672 goto again; 2673 2674 txq->vtntx_stats.vtxs_rescheduled++; 2675 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2676 } 2677 } 2678 2679 static void 2680 vtnet_start(if_t ifp) 2681 { 2682 struct vtnet_softc *sc; 2683 struct vtnet_txq *txq; 2684 2685 sc = if_getsoftc(ifp); 2686 txq = &sc->vtnet_txqs[0]; 2687 2688 VTNET_TXQ_LOCK(txq); 2689 vtnet_start_locked(txq, ifp); 2690 VTNET_TXQ_UNLOCK(txq); 2691 } 2692 2693 #else /* !VTNET_LEGACY_TX */ 2694 2695 static int 2696 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2697 { 2698 struct vtnet_softc *sc; 2699 struct virtqueue *vq; 2700 struct buf_ring *br; 2701 if_t ifp; 2702 int enq, tries, error; 2703 2704 sc = txq->vtntx_sc; 2705 vq = txq->vtntx_vq; 2706 br = txq->vtntx_br; 2707 ifp = sc->vtnet_ifp; 2708 tries = 0; 2709 error = 0; 2710 2711 VTNET_TXQ_LOCK_ASSERT(txq); 2712 2713 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2714 sc->vtnet_link_active == 0) { 2715 if (m != NULL) 2716 error = drbr_enqueue(ifp, br, m); 2717 return (error); 2718 } 2719 2720 if (m != NULL) { 2721 error = drbr_enqueue(ifp, br, m); 2722 if (error) 2723 return (error); 2724 } 2725 2726 vtnet_txq_eof(txq); 2727 2728 again: 2729 enq = 0; 2730 2731 while ((m = drbr_peek(ifp, br)) != NULL) { 2732 if (virtqueue_full(vq)) { 2733 drbr_putback(ifp, br, m); 2734 break; 2735 } 2736 2737 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2738 if (m != NULL) 2739 drbr_putback(ifp, br, m); 2740 else 2741 drbr_advance(ifp, br); 2742 break; 2743 } 2744 drbr_advance(ifp, br); 2745 2746 enq++; 2747 ETHER_BPF_MTAP(ifp, m); 2748 } 2749 2750 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2751 if (tries++ < VTNET_NOTIFY_RETRIES) 2752 goto again; 2753 2754 txq->vtntx_stats.vtxs_rescheduled++; 2755 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2756 } 2757 2758 return (0); 2759 } 2760 2761 static int 2762 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2763 { 2764 struct vtnet_softc *sc; 2765 struct vtnet_txq *txq; 2766 int i, npairs, error; 2767 2768 sc = if_getsoftc(ifp); 2769 npairs = sc->vtnet_act_vq_pairs; 2770 2771 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2772 i = m->m_pkthdr.flowid % npairs; 2773 else 2774 i = curcpu % npairs; 2775 2776 txq = &sc->vtnet_txqs[i]; 2777 2778 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2779 error = vtnet_txq_mq_start_locked(txq, m); 2780 VTNET_TXQ_UNLOCK(txq); 2781 } else { 2782 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2783 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2784 } 2785 2786 return (error); 2787 } 2788 2789 static void 2790 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2791 { 2792 struct vtnet_softc *sc; 2793 struct vtnet_txq *txq; 2794 2795 txq = xtxq; 2796 sc = txq->vtntx_sc; 2797 2798 VTNET_TXQ_LOCK(txq); 2799 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2800 vtnet_txq_mq_start_locked(txq, NULL); 2801 VTNET_TXQ_UNLOCK(txq); 2802 } 2803 2804 #endif /* VTNET_LEGACY_TX */ 2805 2806 static void 2807 vtnet_txq_start(struct vtnet_txq *txq) 2808 { 2809 struct vtnet_softc *sc; 2810 if_t ifp; 2811 2812 sc = txq->vtntx_sc; 2813 ifp = sc->vtnet_ifp; 2814 2815 #ifdef VTNET_LEGACY_TX 2816 if (!if_sendq_empty(ifp)) 2817 vtnet_start_locked(txq, ifp); 2818 #else 2819 if (!drbr_empty(ifp, txq->vtntx_br)) 2820 vtnet_txq_mq_start_locked(txq, NULL); 2821 #endif 2822 } 2823 2824 static void 2825 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2826 { 2827 struct vtnet_softc *sc; 2828 struct vtnet_txq *txq; 2829 if_t ifp; 2830 2831 txq = xtxq; 2832 sc = txq->vtntx_sc; 2833 ifp = sc->vtnet_ifp; 2834 2835 VTNET_TXQ_LOCK(txq); 2836 2837 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2838 VTNET_TXQ_UNLOCK(txq); 2839 return; 2840 } 2841 2842 vtnet_txq_eof(txq); 2843 vtnet_txq_start(txq); 2844 2845 VTNET_TXQ_UNLOCK(txq); 2846 } 2847 2848 static int 2849 vtnet_txq_eof(struct vtnet_txq *txq) 2850 { 2851 struct virtqueue *vq; 2852 struct vtnet_tx_header *txhdr; 2853 struct mbuf *m; 2854 int deq; 2855 2856 vq = txq->vtntx_vq; 2857 deq = 0; 2858 VTNET_TXQ_LOCK_ASSERT(txq); 2859 2860 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2861 m = txhdr->vth_mbuf; 2862 deq++; 2863 2864 txq->vtntx_stats.vtxs_opackets++; 2865 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2866 if (m->m_flags & M_MCAST) 2867 txq->vtntx_stats.vtxs_omcasts++; 2868 2869 m_freem(m); 2870 uma_zfree(vtnet_tx_header_zone, txhdr); 2871 } 2872 2873 if (virtqueue_empty(vq)) 2874 txq->vtntx_watchdog = 0; 2875 2876 return (deq); 2877 } 2878 2879 static void 2880 vtnet_tx_vq_intr(void *xtxq) 2881 { 2882 struct vtnet_softc *sc; 2883 struct vtnet_txq *txq; 2884 if_t ifp; 2885 2886 txq = xtxq; 2887 sc = txq->vtntx_sc; 2888 ifp = sc->vtnet_ifp; 2889 2890 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2891 /* 2892 * Ignore this interrupt. Either this is a spurious interrupt 2893 * or multiqueue without per-VQ MSIX so every queue needs to 2894 * be polled (a brain dead configuration we could try harder 2895 * to avoid). 2896 */ 2897 vtnet_txq_disable_intr(txq); 2898 return; 2899 } 2900 2901 #ifdef DEV_NETMAP 2902 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2903 return; 2904 #endif /* DEV_NETMAP */ 2905 2906 VTNET_TXQ_LOCK(txq); 2907 2908 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2909 VTNET_TXQ_UNLOCK(txq); 2910 return; 2911 } 2912 2913 vtnet_txq_eof(txq); 2914 vtnet_txq_start(txq); 2915 2916 VTNET_TXQ_UNLOCK(txq); 2917 } 2918 2919 static void 2920 vtnet_tx_start_all(struct vtnet_softc *sc) 2921 { 2922 struct vtnet_txq *txq; 2923 int i; 2924 2925 VTNET_CORE_LOCK_ASSERT(sc); 2926 2927 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2928 txq = &sc->vtnet_txqs[i]; 2929 2930 VTNET_TXQ_LOCK(txq); 2931 vtnet_txq_start(txq); 2932 VTNET_TXQ_UNLOCK(txq); 2933 } 2934 } 2935 2936 #ifndef VTNET_LEGACY_TX 2937 static void 2938 vtnet_qflush(if_t ifp) 2939 { 2940 struct vtnet_softc *sc; 2941 struct vtnet_txq *txq; 2942 struct mbuf *m; 2943 int i; 2944 2945 sc = if_getsoftc(ifp); 2946 2947 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2948 txq = &sc->vtnet_txqs[i]; 2949 2950 VTNET_TXQ_LOCK(txq); 2951 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2952 m_freem(m); 2953 VTNET_TXQ_UNLOCK(txq); 2954 } 2955 2956 if_qflush(ifp); 2957 } 2958 #endif 2959 2960 static int 2961 vtnet_watchdog(struct vtnet_txq *txq) 2962 { 2963 if_t ifp; 2964 2965 ifp = txq->vtntx_sc->vtnet_ifp; 2966 2967 VTNET_TXQ_LOCK(txq); 2968 if (txq->vtntx_watchdog == 1) { 2969 /* 2970 * Only drain completed frames if the watchdog is about to 2971 * expire. If any frames were drained, there may be enough 2972 * free descriptors now available to transmit queued frames. 2973 * In that case, the timer will immediately be decremented 2974 * below, but the timeout is generous enough that should not 2975 * be a problem. 2976 */ 2977 if (vtnet_txq_eof(txq) != 0) 2978 vtnet_txq_start(txq); 2979 } 2980 2981 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2982 VTNET_TXQ_UNLOCK(txq); 2983 return (0); 2984 } 2985 VTNET_TXQ_UNLOCK(txq); 2986 2987 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2988 return (1); 2989 } 2990 2991 static void 2992 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 2993 struct vtnet_txq_stats *txacc) 2994 { 2995 2996 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 2997 bzero(txacc, sizeof(struct vtnet_txq_stats)); 2998 2999 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3000 struct vtnet_rxq_stats *rxst; 3001 struct vtnet_txq_stats *txst; 3002 3003 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 3004 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 3005 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 3006 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 3007 rxacc->vrxs_csum += rxst->vrxs_csum; 3008 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 3009 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 3010 3011 txst = &sc->vtnet_txqs[i].vtntx_stats; 3012 txacc->vtxs_opackets += txst->vtxs_opackets; 3013 txacc->vtxs_obytes += txst->vtxs_obytes; 3014 txacc->vtxs_csum += txst->vtxs_csum; 3015 txacc->vtxs_tso += txst->vtxs_tso; 3016 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 3017 } 3018 } 3019 3020 static uint64_t 3021 vtnet_get_counter(if_t ifp, ift_counter cnt) 3022 { 3023 struct vtnet_softc *sc; 3024 struct vtnet_rxq_stats rxaccum; 3025 struct vtnet_txq_stats txaccum; 3026 3027 sc = if_getsoftc(ifp); 3028 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3029 3030 switch (cnt) { 3031 case IFCOUNTER_IPACKETS: 3032 return (rxaccum.vrxs_ipackets); 3033 case IFCOUNTER_IQDROPS: 3034 return (rxaccum.vrxs_iqdrops); 3035 case IFCOUNTER_IERRORS: 3036 return (rxaccum.vrxs_ierrors); 3037 case IFCOUNTER_OPACKETS: 3038 return (txaccum.vtxs_opackets); 3039 #ifndef VTNET_LEGACY_TX 3040 case IFCOUNTER_OBYTES: 3041 return (txaccum.vtxs_obytes); 3042 case IFCOUNTER_OMCASTS: 3043 return (txaccum.vtxs_omcasts); 3044 #endif 3045 default: 3046 return (if_get_counter_default(ifp, cnt)); 3047 } 3048 } 3049 3050 static void 3051 vtnet_tick(void *xsc) 3052 { 3053 struct vtnet_softc *sc; 3054 if_t ifp; 3055 int i, timedout; 3056 3057 sc = xsc; 3058 ifp = sc->vtnet_ifp; 3059 timedout = 0; 3060 3061 VTNET_CORE_LOCK_ASSERT(sc); 3062 3063 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3064 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3065 3066 if (timedout != 0) { 3067 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3068 vtnet_init_locked(sc, 0); 3069 } else 3070 callout_schedule(&sc->vtnet_tick_ch, hz); 3071 } 3072 3073 static void 3074 vtnet_start_taskqueues(struct vtnet_softc *sc) 3075 { 3076 device_t dev; 3077 struct vtnet_rxq *rxq; 3078 struct vtnet_txq *txq; 3079 int i, error; 3080 3081 dev = sc->vtnet_dev; 3082 3083 /* 3084 * Errors here are very difficult to recover from - we cannot 3085 * easily fail because, if this is during boot, we will hang 3086 * when freeing any successfully started taskqueues because 3087 * the scheduler isn't up yet. 3088 * 3089 * Most drivers just ignore the return value - it only fails 3090 * with ENOMEM so an error is not likely. 3091 */ 3092 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3093 rxq = &sc->vtnet_rxqs[i]; 3094 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3095 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3096 if (error) { 3097 device_printf(dev, "failed to start rx taskq %d\n", 3098 rxq->vtnrx_id); 3099 } 3100 3101 txq = &sc->vtnet_txqs[i]; 3102 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3103 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3104 if (error) { 3105 device_printf(dev, "failed to start tx taskq %d\n", 3106 txq->vtntx_id); 3107 } 3108 } 3109 } 3110 3111 static void 3112 vtnet_free_taskqueues(struct vtnet_softc *sc) 3113 { 3114 struct vtnet_rxq *rxq; 3115 struct vtnet_txq *txq; 3116 int i; 3117 3118 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3119 rxq = &sc->vtnet_rxqs[i]; 3120 if (rxq->vtnrx_tq != NULL) { 3121 taskqueue_free(rxq->vtnrx_tq); 3122 rxq->vtnrx_tq = NULL; 3123 } 3124 3125 txq = &sc->vtnet_txqs[i]; 3126 if (txq->vtntx_tq != NULL) { 3127 taskqueue_free(txq->vtntx_tq); 3128 txq->vtntx_tq = NULL; 3129 } 3130 } 3131 } 3132 3133 static void 3134 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3135 { 3136 struct vtnet_rxq *rxq; 3137 struct vtnet_txq *txq; 3138 int i; 3139 3140 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3141 rxq = &sc->vtnet_rxqs[i]; 3142 if (rxq->vtnrx_tq != NULL) 3143 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3144 3145 txq = &sc->vtnet_txqs[i]; 3146 if (txq->vtntx_tq != NULL) { 3147 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3148 #ifndef VTNET_LEGACY_TX 3149 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3150 #endif 3151 } 3152 } 3153 } 3154 3155 static void 3156 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3157 { 3158 struct vtnet_rxq *rxq; 3159 struct vtnet_txq *txq; 3160 int i; 3161 3162 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3163 rxq = &sc->vtnet_rxqs[i]; 3164 vtnet_rxq_free_mbufs(rxq); 3165 3166 txq = &sc->vtnet_txqs[i]; 3167 vtnet_txq_free_mbufs(txq); 3168 } 3169 } 3170 3171 static void 3172 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3173 { 3174 struct vtnet_rxq *rxq; 3175 struct vtnet_txq *txq; 3176 int i; 3177 3178 VTNET_CORE_LOCK_ASSERT(sc); 3179 3180 /* 3181 * Lock and unlock the per-queue mutex so we known the stop 3182 * state is visible. Doing only the active queues should be 3183 * sufficient, but it does not cost much extra to do all the 3184 * queues. 3185 */ 3186 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3187 rxq = &sc->vtnet_rxqs[i]; 3188 VTNET_RXQ_LOCK(rxq); 3189 VTNET_RXQ_UNLOCK(rxq); 3190 3191 txq = &sc->vtnet_txqs[i]; 3192 VTNET_TXQ_LOCK(txq); 3193 VTNET_TXQ_UNLOCK(txq); 3194 } 3195 } 3196 3197 static void 3198 vtnet_stop(struct vtnet_softc *sc) 3199 { 3200 device_t dev; 3201 if_t ifp; 3202 3203 dev = sc->vtnet_dev; 3204 ifp = sc->vtnet_ifp; 3205 3206 VTNET_CORE_LOCK_ASSERT(sc); 3207 3208 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3209 sc->vtnet_link_active = 0; 3210 callout_stop(&sc->vtnet_tick_ch); 3211 3212 /* Only advisory. */ 3213 vtnet_disable_interrupts(sc); 3214 3215 #ifdef DEV_NETMAP 3216 /* Stop any pending txsync/rxsync and disable them. */ 3217 netmap_disable_all_rings(ifp); 3218 #endif /* DEV_NETMAP */ 3219 3220 /* 3221 * Stop the host adapter. This resets it to the pre-initialized 3222 * state. It will not generate any interrupts until after it is 3223 * reinitialized. 3224 */ 3225 virtio_stop(dev); 3226 vtnet_stop_rendezvous(sc); 3227 3228 vtnet_drain_rxtx_queues(sc); 3229 sc->vtnet_act_vq_pairs = 1; 3230 } 3231 3232 static int 3233 vtnet_virtio_reinit(struct vtnet_softc *sc) 3234 { 3235 device_t dev; 3236 if_t ifp; 3237 uint64_t features; 3238 int error; 3239 3240 dev = sc->vtnet_dev; 3241 ifp = sc->vtnet_ifp; 3242 features = sc->vtnet_negotiated_features; 3243 3244 /* 3245 * Re-negotiate with the host, removing any disabled receive 3246 * features. Transmit features are disabled only on our side 3247 * via if_capenable and if_hwassist. 3248 */ 3249 3250 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3251 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3252 3253 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3254 features &= ~VTNET_LRO_FEATURES; 3255 3256 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3257 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3258 3259 error = virtio_reinit(dev, features); 3260 if (error) { 3261 device_printf(dev, "virtio reinit error %d\n", error); 3262 return (error); 3263 } 3264 3265 sc->vtnet_features = features; 3266 virtio_reinit_complete(dev); 3267 3268 return (0); 3269 } 3270 3271 static void 3272 vtnet_init_rx_filters(struct vtnet_softc *sc) 3273 { 3274 if_t ifp; 3275 3276 ifp = sc->vtnet_ifp; 3277 3278 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3279 vtnet_rx_filter(sc); 3280 vtnet_rx_filter_mac(sc); 3281 } 3282 3283 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3284 vtnet_rx_filter_vlan(sc); 3285 } 3286 3287 static int 3288 vtnet_init_rx_queues(struct vtnet_softc *sc) 3289 { 3290 device_t dev; 3291 if_t ifp; 3292 struct vtnet_rxq *rxq; 3293 int i, clustersz, error; 3294 3295 dev = sc->vtnet_dev; 3296 ifp = sc->vtnet_ifp; 3297 3298 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3299 sc->vtnet_rx_clustersz = clustersz; 3300 3301 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3302 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3303 VTNET_MAX_RX_SIZE, clustersz); 3304 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3305 ("%s: too many rx mbufs %d for %d segments", __func__, 3306 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3307 } else 3308 sc->vtnet_rx_nmbufs = 1; 3309 3310 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3311 rxq = &sc->vtnet_rxqs[i]; 3312 3313 /* Hold the lock to satisfy asserts. */ 3314 VTNET_RXQ_LOCK(rxq); 3315 error = vtnet_rxq_populate(rxq); 3316 VTNET_RXQ_UNLOCK(rxq); 3317 3318 if (error) { 3319 device_printf(dev, "cannot populate Rx queue %d\n", i); 3320 return (error); 3321 } 3322 } 3323 3324 return (0); 3325 } 3326 3327 static int 3328 vtnet_init_tx_queues(struct vtnet_softc *sc) 3329 { 3330 struct vtnet_txq *txq; 3331 int i; 3332 3333 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3334 txq = &sc->vtnet_txqs[i]; 3335 txq->vtntx_watchdog = 0; 3336 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3337 #ifdef DEV_NETMAP 3338 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3339 #endif /* DEV_NETMAP */ 3340 } 3341 3342 return (0); 3343 } 3344 3345 static int 3346 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3347 { 3348 int error; 3349 3350 error = vtnet_init_rx_queues(sc); 3351 if (error) 3352 return (error); 3353 3354 error = vtnet_init_tx_queues(sc); 3355 if (error) 3356 return (error); 3357 3358 return (0); 3359 } 3360 3361 static void 3362 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3363 { 3364 device_t dev; 3365 int npairs; 3366 3367 dev = sc->vtnet_dev; 3368 3369 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3370 sc->vtnet_act_vq_pairs = 1; 3371 return; 3372 } 3373 3374 npairs = sc->vtnet_req_vq_pairs; 3375 3376 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3377 device_printf(dev, "cannot set active queue pairs to %d, " 3378 "falling back to 1 queue pair\n", npairs); 3379 npairs = 1; 3380 } 3381 3382 sc->vtnet_act_vq_pairs = npairs; 3383 } 3384 3385 static void 3386 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3387 { 3388 if_t ifp; 3389 uint64_t features; 3390 int error; 3391 3392 ifp = sc->vtnet_ifp; 3393 features = sc->vtnet_features; 3394 3395 VTNET_CORE_LOCK_ASSERT(sc); 3396 3397 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3398 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3399 features |= VIRTIO_NET_F_GUEST_CSUM; 3400 else 3401 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3402 } 3403 3404 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3405 if (if_getcapenable(ifp) & IFCAP_LRO) 3406 features |= VTNET_LRO_FEATURES; 3407 else 3408 features &= ~VTNET_LRO_FEATURES; 3409 } 3410 3411 error = vtnet_ctrl_guest_offloads(sc, 3412 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3413 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3414 VIRTIO_NET_F_GUEST_UFO)); 3415 if (error) { 3416 device_printf(sc->vtnet_dev, 3417 "%s: cannot update Rx features\n", __func__); 3418 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3419 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3420 vtnet_init_locked(sc, 0); 3421 } 3422 } else 3423 sc->vtnet_features = features; 3424 } 3425 3426 static int 3427 vtnet_reinit(struct vtnet_softc *sc) 3428 { 3429 if_t ifp; 3430 int error; 3431 3432 ifp = sc->vtnet_ifp; 3433 3434 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3435 3436 error = vtnet_virtio_reinit(sc); 3437 if (error) 3438 return (error); 3439 3440 vtnet_set_macaddr(sc); 3441 vtnet_set_active_vq_pairs(sc); 3442 3443 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3444 vtnet_init_rx_filters(sc); 3445 3446 if_sethwassist(ifp, 0); 3447 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3448 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3449 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3450 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3451 if (if_getcapenable(ifp) & IFCAP_TSO4) 3452 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3453 if (if_getcapenable(ifp) & IFCAP_TSO6) 3454 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3455 3456 error = vtnet_init_rxtx_queues(sc); 3457 if (error) 3458 return (error); 3459 3460 return (0); 3461 } 3462 3463 static void 3464 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3465 { 3466 if_t ifp; 3467 3468 ifp = sc->vtnet_ifp; 3469 3470 VTNET_CORE_LOCK_ASSERT(sc); 3471 3472 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3473 return; 3474 3475 vtnet_stop(sc); 3476 3477 #ifdef DEV_NETMAP 3478 /* Once stopped we can update the netmap flags, if necessary. */ 3479 switch (init_mode) { 3480 case VTNET_INIT_NETMAP_ENTER: 3481 nm_set_native_flags(NA(ifp)); 3482 break; 3483 case VTNET_INIT_NETMAP_EXIT: 3484 nm_clear_native_flags(NA(ifp)); 3485 break; 3486 } 3487 #endif /* DEV_NETMAP */ 3488 3489 if (vtnet_reinit(sc) != 0) { 3490 vtnet_stop(sc); 3491 return; 3492 } 3493 3494 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3495 vtnet_update_link_status(sc); 3496 vtnet_enable_interrupts(sc); 3497 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3498 3499 #ifdef DEV_NETMAP 3500 /* Re-enable txsync/rxsync. */ 3501 netmap_enable_all_rings(ifp); 3502 #endif /* DEV_NETMAP */ 3503 } 3504 3505 static void 3506 vtnet_init(void *xsc) 3507 { 3508 struct vtnet_softc *sc; 3509 3510 sc = xsc; 3511 3512 VTNET_CORE_LOCK(sc); 3513 vtnet_init_locked(sc, 0); 3514 VTNET_CORE_UNLOCK(sc); 3515 } 3516 3517 static void 3518 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3519 { 3520 3521 /* 3522 * The control virtqueue is only polled and therefore it should 3523 * already be empty. 3524 */ 3525 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3526 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3527 } 3528 3529 static void 3530 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3531 struct sglist *sg, int readable, int writable) 3532 { 3533 struct virtqueue *vq; 3534 3535 vq = sc->vtnet_ctrl_vq; 3536 3537 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3538 VTNET_CORE_LOCK_ASSERT(sc); 3539 3540 if (!virtqueue_empty(vq)) 3541 return; 3542 3543 /* 3544 * Poll for the response, but the command is likely completed before 3545 * returning from the notify. 3546 */ 3547 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3548 virtqueue_notify(vq); 3549 virtqueue_poll(vq, NULL); 3550 } 3551 } 3552 3553 static int 3554 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3555 { 3556 struct sglist_seg segs[3]; 3557 struct sglist sg; 3558 struct { 3559 struct virtio_net_ctrl_hdr hdr __aligned(2); 3560 uint8_t pad1; 3561 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3562 uint8_t pad2; 3563 uint8_t ack; 3564 } s; 3565 int error; 3566 3567 error = 0; 3568 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3569 3570 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3571 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3572 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3573 s.ack = VIRTIO_NET_ERR; 3574 3575 sglist_init(&sg, nitems(segs), segs); 3576 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3577 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3578 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3579 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3580 3581 if (error == 0) 3582 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3583 3584 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3585 } 3586 3587 static int 3588 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3589 { 3590 struct sglist_seg segs[3]; 3591 struct sglist sg; 3592 struct { 3593 struct virtio_net_ctrl_hdr hdr __aligned(2); 3594 uint8_t pad1; 3595 uint64_t offloads __aligned(8); 3596 uint8_t pad2; 3597 uint8_t ack; 3598 } s; 3599 int error; 3600 3601 error = 0; 3602 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3603 3604 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3605 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3606 s.offloads = vtnet_gtoh64(sc, offloads); 3607 s.ack = VIRTIO_NET_ERR; 3608 3609 sglist_init(&sg, nitems(segs), segs); 3610 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3611 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3612 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3613 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3614 3615 if (error == 0) 3616 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3617 3618 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3619 } 3620 3621 static int 3622 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3623 { 3624 struct sglist_seg segs[3]; 3625 struct sglist sg; 3626 struct { 3627 struct virtio_net_ctrl_hdr hdr __aligned(2); 3628 uint8_t pad1; 3629 struct virtio_net_ctrl_mq mq __aligned(2); 3630 uint8_t pad2; 3631 uint8_t ack; 3632 } s; 3633 int error; 3634 3635 error = 0; 3636 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3637 3638 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3639 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3640 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3641 s.ack = VIRTIO_NET_ERR; 3642 3643 sglist_init(&sg, nitems(segs), segs); 3644 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3645 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3646 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3647 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3648 3649 if (error == 0) 3650 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3651 3652 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3653 } 3654 3655 static int 3656 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3657 { 3658 struct sglist_seg segs[3]; 3659 struct sglist sg; 3660 struct { 3661 struct virtio_net_ctrl_hdr hdr __aligned(2); 3662 uint8_t pad1; 3663 uint8_t onoff; 3664 uint8_t pad2; 3665 uint8_t ack; 3666 } s; 3667 int error; 3668 3669 error = 0; 3670 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3671 3672 s.hdr.class = VIRTIO_NET_CTRL_RX; 3673 s.hdr.cmd = cmd; 3674 s.onoff = on; 3675 s.ack = VIRTIO_NET_ERR; 3676 3677 sglist_init(&sg, nitems(segs), segs); 3678 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3679 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3680 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3681 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3682 3683 if (error == 0) 3684 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3685 3686 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3687 } 3688 3689 static int 3690 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3691 { 3692 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3693 } 3694 3695 static int 3696 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3697 { 3698 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3699 } 3700 3701 static void 3702 vtnet_rx_filter(struct vtnet_softc *sc) 3703 { 3704 device_t dev; 3705 if_t ifp; 3706 3707 dev = sc->vtnet_dev; 3708 ifp = sc->vtnet_ifp; 3709 3710 VTNET_CORE_LOCK_ASSERT(sc); 3711 3712 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3713 device_printf(dev, "cannot %s promiscuous mode\n", 3714 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3715 } 3716 3717 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3718 device_printf(dev, "cannot %s all-multicast mode\n", 3719 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3720 } 3721 } 3722 3723 static u_int 3724 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3725 { 3726 struct vtnet_softc *sc = arg; 3727 3728 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3729 return (0); 3730 3731 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3732 bcopy(LLADDR(sdl), 3733 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3734 ETHER_ADDR_LEN); 3735 3736 return (1); 3737 } 3738 3739 static u_int 3740 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3741 { 3742 struct vtnet_mac_filter *filter = arg; 3743 3744 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3745 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3746 ETHER_ADDR_LEN); 3747 3748 return (1); 3749 } 3750 3751 static void 3752 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3753 { 3754 struct virtio_net_ctrl_hdr hdr __aligned(2); 3755 struct vtnet_mac_filter *filter; 3756 struct sglist_seg segs[4]; 3757 struct sglist sg; 3758 if_t ifp; 3759 bool promisc, allmulti; 3760 u_int ucnt, mcnt; 3761 int error; 3762 uint8_t ack; 3763 3764 ifp = sc->vtnet_ifp; 3765 filter = sc->vtnet_mac_filter; 3766 error = 0; 3767 3768 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3769 VTNET_CORE_LOCK_ASSERT(sc); 3770 3771 /* Unicast MAC addresses: */ 3772 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3773 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3774 3775 if (promisc) { 3776 ucnt = 0; 3777 if_printf(ifp, "more than %d MAC addresses assigned, " 3778 "falling back to promiscuous mode\n", 3779 VTNET_MAX_MAC_ENTRIES); 3780 } 3781 3782 /* Multicast MAC addresses: */ 3783 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3784 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3785 3786 if (allmulti) { 3787 mcnt = 0; 3788 if_printf(ifp, "more than %d multicast MAC addresses " 3789 "assigned, falling back to all-multicast mode\n", 3790 VTNET_MAX_MAC_ENTRIES); 3791 } 3792 3793 if (promisc && allmulti) 3794 goto out; 3795 3796 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3797 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3798 3799 hdr.class = VIRTIO_NET_CTRL_MAC; 3800 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3801 ack = VIRTIO_NET_ERR; 3802 3803 sglist_init(&sg, nitems(segs), segs); 3804 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3805 error |= sglist_append(&sg, &filter->vmf_unicast, 3806 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3807 error |= sglist_append(&sg, &filter->vmf_multicast, 3808 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3809 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3810 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3811 3812 if (error == 0) 3813 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3814 if (ack != VIRTIO_NET_OK) 3815 if_printf(ifp, "error setting host MAC filter table\n"); 3816 3817 out: 3818 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3819 if_printf(ifp, "cannot enable promiscuous mode\n"); 3820 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3821 if_printf(ifp, "cannot enable all-multicast mode\n"); 3822 } 3823 3824 static int 3825 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3826 { 3827 struct sglist_seg segs[3]; 3828 struct sglist sg; 3829 struct { 3830 struct virtio_net_ctrl_hdr hdr __aligned(2); 3831 uint8_t pad1; 3832 uint16_t tag __aligned(2); 3833 uint8_t pad2; 3834 uint8_t ack; 3835 } s; 3836 int error; 3837 3838 error = 0; 3839 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3840 3841 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3842 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3843 s.tag = vtnet_gtoh16(sc, tag); 3844 s.ack = VIRTIO_NET_ERR; 3845 3846 sglist_init(&sg, nitems(segs), segs); 3847 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3848 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3849 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3850 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3851 3852 if (error == 0) 3853 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3854 3855 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3856 } 3857 3858 static void 3859 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3860 { 3861 int i, bit; 3862 uint32_t w; 3863 uint16_t tag; 3864 3865 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3866 VTNET_CORE_LOCK_ASSERT(sc); 3867 3868 /* Enable the filter for each configured VLAN. */ 3869 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3870 w = sc->vtnet_vlan_filter[i]; 3871 3872 while ((bit = ffs(w) - 1) != -1) { 3873 w &= ~(1 << bit); 3874 tag = sizeof(w) * CHAR_BIT * i + bit; 3875 3876 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3877 device_printf(sc->vtnet_dev, 3878 "cannot enable VLAN %d filter\n", tag); 3879 } 3880 } 3881 } 3882 } 3883 3884 static void 3885 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3886 { 3887 if_t ifp; 3888 int idx, bit; 3889 3890 ifp = sc->vtnet_ifp; 3891 idx = (tag >> 5) & 0x7F; 3892 bit = tag & 0x1F; 3893 3894 if (tag == 0 || tag > 4095) 3895 return; 3896 3897 VTNET_CORE_LOCK(sc); 3898 3899 if (add) 3900 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3901 else 3902 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3903 3904 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3905 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3906 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3907 device_printf(sc->vtnet_dev, 3908 "cannot %s VLAN %d %s the host filter table\n", 3909 add ? "add" : "remove", tag, add ? "to" : "from"); 3910 } 3911 3912 VTNET_CORE_UNLOCK(sc); 3913 } 3914 3915 static void 3916 vtnet_register_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, 1, tag); 3923 } 3924 3925 static void 3926 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3927 { 3928 3929 if (if_getsoftc(ifp) != arg) 3930 return; 3931 3932 vtnet_update_vlan_filter(arg, 0, tag); 3933 } 3934 3935 static void 3936 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3937 { 3938 if_t ifp; 3939 uint32_t speed; 3940 3941 ifp = sc->vtnet_ifp; 3942 3943 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3944 return; 3945 3946 /* BMV: Ignore duplex. */ 3947 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3948 offsetof(struct virtio_net_config, speed)); 3949 if (speed != UINT32_MAX) 3950 if_setbaudrate(ifp, IF_Mbps(speed)); 3951 } 3952 3953 static int 3954 vtnet_is_link_up(struct vtnet_softc *sc) 3955 { 3956 uint16_t status; 3957 3958 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3959 return (1); 3960 3961 status = virtio_read_dev_config_2(sc->vtnet_dev, 3962 offsetof(struct virtio_net_config, status)); 3963 3964 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3965 } 3966 3967 static void 3968 vtnet_update_link_status(struct vtnet_softc *sc) 3969 { 3970 if_t ifp; 3971 int link; 3972 3973 ifp = sc->vtnet_ifp; 3974 VTNET_CORE_LOCK_ASSERT(sc); 3975 link = vtnet_is_link_up(sc); 3976 3977 /* Notify if the link status has changed. */ 3978 if (link != 0 && sc->vtnet_link_active == 0) { 3979 vtnet_update_speed_duplex(sc); 3980 sc->vtnet_link_active = 1; 3981 if_link_state_change(ifp, LINK_STATE_UP); 3982 } else if (link == 0 && sc->vtnet_link_active != 0) { 3983 sc->vtnet_link_active = 0; 3984 if_link_state_change(ifp, LINK_STATE_DOWN); 3985 } 3986 } 3987 3988 static int 3989 vtnet_ifmedia_upd(if_t ifp __unused) 3990 { 3991 return (EOPNOTSUPP); 3992 } 3993 3994 static void 3995 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 3996 { 3997 struct vtnet_softc *sc; 3998 3999 sc = if_getsoftc(ifp); 4000 4001 ifmr->ifm_status = IFM_AVALID; 4002 ifmr->ifm_active = IFM_ETHER; 4003 4004 VTNET_CORE_LOCK(sc); 4005 if (vtnet_is_link_up(sc) != 0) { 4006 ifmr->ifm_status |= IFM_ACTIVE; 4007 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 4008 } else 4009 ifmr->ifm_active |= IFM_NONE; 4010 VTNET_CORE_UNLOCK(sc); 4011 } 4012 4013 static void 4014 vtnet_get_macaddr(struct vtnet_softc *sc) 4015 { 4016 4017 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 4018 virtio_read_device_config_array(sc->vtnet_dev, 4019 offsetof(struct virtio_net_config, mac), 4020 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4021 } else { 4022 /* Generate a random locally administered unicast address. */ 4023 sc->vtnet_hwaddr[0] = 0xB2; 4024 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4025 } 4026 } 4027 4028 static void 4029 vtnet_set_macaddr(struct vtnet_softc *sc) 4030 { 4031 device_t dev; 4032 int error; 4033 4034 dev = sc->vtnet_dev; 4035 4036 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4037 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4038 if (error) 4039 device_printf(dev, "unable to set MAC address\n"); 4040 return; 4041 } 4042 4043 /* MAC in config is read-only in modern VirtIO. */ 4044 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4045 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4046 virtio_write_dev_config_1(dev, 4047 offsetof(struct virtio_net_config, mac) + i, 4048 sc->vtnet_hwaddr[i]); 4049 } 4050 } 4051 } 4052 4053 static void 4054 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4055 { 4056 4057 /* Assign MAC address if it was generated. */ 4058 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4059 vtnet_set_macaddr(sc); 4060 } 4061 4062 static void 4063 vtnet_vlan_tag_remove(struct mbuf *m) 4064 { 4065 struct ether_vlan_header *evh; 4066 4067 evh = mtod(m, struct ether_vlan_header *); 4068 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4069 m->m_flags |= M_VLANTAG; 4070 4071 /* Strip the 802.1Q header. */ 4072 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4073 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4074 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4075 } 4076 4077 static void 4078 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4079 { 4080 int limit; 4081 4082 limit = vtnet_tunable_int(sc, "rx_process_limit", 4083 vtnet_rx_process_limit); 4084 if (limit < 0) 4085 limit = INT_MAX; 4086 sc->vtnet_rx_process_limit = limit; 4087 } 4088 4089 static void 4090 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4091 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4092 { 4093 struct sysctl_oid *node; 4094 struct sysctl_oid_list *list; 4095 struct vtnet_rxq_stats *stats; 4096 char namebuf[16]; 4097 4098 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4099 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4100 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4101 list = SYSCTL_CHILDREN(node); 4102 4103 stats = &rxq->vtnrx_stats; 4104 4105 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4106 &stats->vrxs_ipackets, "Receive packets"); 4107 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4108 &stats->vrxs_ibytes, "Receive bytes"); 4109 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4110 &stats->vrxs_iqdrops, "Receive drops"); 4111 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4112 &stats->vrxs_ierrors, "Receive errors"); 4113 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4114 &stats->vrxs_csum, "Receive checksum offloaded"); 4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4116 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4117 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4118 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4119 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4120 &stats->vrxs_rescheduled, 4121 "Receive interrupt handler rescheduled"); 4122 } 4123 4124 static void 4125 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4126 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4127 { 4128 struct sysctl_oid *node; 4129 struct sysctl_oid_list *list; 4130 struct vtnet_txq_stats *stats; 4131 char namebuf[16]; 4132 4133 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4134 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4135 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4136 list = SYSCTL_CHILDREN(node); 4137 4138 stats = &txq->vtntx_stats; 4139 4140 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4141 &stats->vtxs_opackets, "Transmit packets"); 4142 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4143 &stats->vtxs_obytes, "Transmit bytes"); 4144 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4145 &stats->vtxs_omcasts, "Transmit multicasts"); 4146 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4147 &stats->vtxs_csum, "Transmit checksum offloaded"); 4148 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4149 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4150 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4151 &stats->vtxs_rescheduled, 4152 "Transmit interrupt handler rescheduled"); 4153 } 4154 4155 static void 4156 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4157 { 4158 device_t dev; 4159 struct sysctl_ctx_list *ctx; 4160 struct sysctl_oid *tree; 4161 struct sysctl_oid_list *child; 4162 int i; 4163 4164 dev = sc->vtnet_dev; 4165 ctx = device_get_sysctl_ctx(dev); 4166 tree = device_get_sysctl_tree(dev); 4167 child = SYSCTL_CHILDREN(tree); 4168 4169 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4170 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4171 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4172 } 4173 } 4174 4175 static void 4176 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4177 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4178 { 4179 struct vtnet_statistics *stats; 4180 struct vtnet_rxq_stats rxaccum; 4181 struct vtnet_txq_stats txaccum; 4182 4183 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4184 4185 stats = &sc->vtnet_stats; 4186 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4187 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4188 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4189 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4190 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4191 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4192 4193 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4194 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4195 "Mbuf cluster allocation failures"); 4196 4197 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4198 CTLFLAG_RD, &stats->rx_frame_too_large, 4199 "Received frame larger than the mbuf chain"); 4200 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4201 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4202 "Enqueuing the replacement receive mbuf failed"); 4203 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4204 CTLFLAG_RD, &stats->rx_mergeable_failed, 4205 "Mergeable buffers receive failures"); 4206 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4207 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4208 "Received checksum offloaded buffer with unsupported " 4209 "Ethernet type"); 4210 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4211 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4212 "Received checksum offloaded buffer with incorrect IP protocol"); 4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4214 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4215 "Received checksum offloaded buffer with incorrect offset"); 4216 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4217 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4218 "Received checksum offloaded buffer with incorrect protocol"); 4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4220 CTLFLAG_RD, &stats->rx_csum_failed, 4221 "Received buffer checksum offload failed"); 4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4223 CTLFLAG_RD, &stats->rx_csum_offloaded, 4224 "Received buffer checksum offload succeeded"); 4225 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4226 CTLFLAG_RD, &stats->rx_task_rescheduled, 4227 "Times the receive interrupt task rescheduled itself"); 4228 4229 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4230 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4231 "Aborted transmit of checksum offloaded buffer with unknown " 4232 "Ethernet type"); 4233 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4234 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4235 "Aborted transmit of checksum offloaded buffer because mismatched " 4236 "protocols"); 4237 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4238 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4239 "Aborted transmit of TSO buffer with non TCP protocol"); 4240 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4241 CTLFLAG_RD, &stats->tx_tso_without_csum, 4242 "Aborted transmit of TSO buffer without TCP checksum offload"); 4243 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4244 CTLFLAG_RD, &stats->tx_defragged, 4245 "Transmit mbufs defragged"); 4246 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4247 CTLFLAG_RD, &stats->tx_defrag_failed, 4248 "Aborted transmit of buffer because defrag failed"); 4249 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4250 CTLFLAG_RD, &stats->tx_csum_offloaded, 4251 "Offloaded checksum of transmitted buffer"); 4252 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4253 CTLFLAG_RD, &stats->tx_tso_offloaded, 4254 "Segmentation offload of transmitted buffer"); 4255 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4256 CTLFLAG_RD, &stats->tx_task_rescheduled, 4257 "Times the transmit interrupt task rescheduled itself"); 4258 } 4259 4260 static void 4261 vtnet_setup_sysctl(struct vtnet_softc *sc) 4262 { 4263 device_t dev; 4264 struct sysctl_ctx_list *ctx; 4265 struct sysctl_oid *tree; 4266 struct sysctl_oid_list *child; 4267 4268 dev = sc->vtnet_dev; 4269 ctx = device_get_sysctl_ctx(dev); 4270 tree = device_get_sysctl_tree(dev); 4271 child = SYSCTL_CHILDREN(tree); 4272 4273 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4274 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4275 "Number of maximum supported virtqueue pairs"); 4276 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4277 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4278 "Number of requested virtqueue pairs"); 4279 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4280 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4281 "Number of active virtqueue pairs"); 4282 4283 vtnet_setup_stat_sysctl(ctx, child, sc); 4284 } 4285 4286 static void 4287 vtnet_load_tunables(struct vtnet_softc *sc) 4288 { 4289 4290 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4291 "lro_entry_count", vtnet_lro_entry_count); 4292 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4293 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4294 4295 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4296 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4297 } 4298 4299 static int 4300 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4301 { 4302 4303 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4304 } 4305 4306 static void 4307 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4308 { 4309 4310 virtqueue_disable_intr(rxq->vtnrx_vq); 4311 } 4312 4313 static int 4314 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4315 { 4316 struct virtqueue *vq; 4317 4318 vq = txq->vtntx_vq; 4319 4320 if (vtnet_txq_below_threshold(txq) != 0) 4321 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4322 4323 /* 4324 * The free count is above our threshold. Keep the Tx interrupt 4325 * disabled until the queue is fuller. 4326 */ 4327 return (0); 4328 } 4329 4330 static void 4331 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4332 { 4333 4334 virtqueue_disable_intr(txq->vtntx_vq); 4335 } 4336 4337 static void 4338 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4339 { 4340 struct vtnet_rxq *rxq; 4341 int i; 4342 4343 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4344 rxq = &sc->vtnet_rxqs[i]; 4345 if (vtnet_rxq_enable_intr(rxq) != 0) 4346 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4347 } 4348 } 4349 4350 static void 4351 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4352 { 4353 int i; 4354 4355 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4356 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4357 } 4358 4359 static void 4360 vtnet_enable_interrupts(struct vtnet_softc *sc) 4361 { 4362 4363 vtnet_enable_rx_interrupts(sc); 4364 vtnet_enable_tx_interrupts(sc); 4365 } 4366 4367 static void 4368 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4369 { 4370 int i; 4371 4372 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4373 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4374 } 4375 4376 static void 4377 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4378 { 4379 int i; 4380 4381 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4382 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4383 } 4384 4385 static void 4386 vtnet_disable_interrupts(struct vtnet_softc *sc) 4387 { 4388 4389 vtnet_disable_rx_interrupts(sc); 4390 vtnet_disable_tx_interrupts(sc); 4391 } 4392 4393 static int 4394 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4395 { 4396 char path[64]; 4397 4398 snprintf(path, sizeof(path), 4399 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4400 TUNABLE_INT_FETCH(path, &def); 4401 4402 return (def); 4403 } 4404 4405 #ifdef DEBUGNET 4406 static void 4407 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4408 { 4409 struct vtnet_softc *sc; 4410 4411 sc = if_getsoftc(ifp); 4412 4413 VTNET_CORE_LOCK(sc); 4414 *nrxr = sc->vtnet_req_vq_pairs; 4415 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4416 *clsize = sc->vtnet_rx_clustersz; 4417 VTNET_CORE_UNLOCK(sc); 4418 } 4419 4420 static void 4421 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4422 { 4423 struct vtnet_softc *sc; 4424 static bool sw_lro_enabled = false; 4425 4426 /* 4427 * Disable software LRO, since it would require entering the network 4428 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4429 */ 4430 sc = if_getsoftc(ifp); 4431 switch (event) { 4432 case DEBUGNET_START: 4433 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4434 if (sw_lro_enabled) 4435 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4436 break; 4437 case DEBUGNET_END: 4438 if (sw_lro_enabled) 4439 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4440 break; 4441 } 4442 } 4443 4444 static int 4445 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4446 { 4447 struct vtnet_softc *sc; 4448 struct vtnet_txq *txq; 4449 int error; 4450 4451 sc = if_getsoftc(ifp); 4452 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4453 IFF_DRV_RUNNING) 4454 return (EBUSY); 4455 4456 txq = &sc->vtnet_txqs[0]; 4457 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4458 if (error == 0) 4459 (void)vtnet_txq_notify(txq); 4460 return (error); 4461 } 4462 4463 static int 4464 vtnet_debugnet_poll(if_t ifp, int count) 4465 { 4466 struct vtnet_softc *sc; 4467 int i; 4468 4469 sc = if_getsoftc(ifp); 4470 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4471 IFF_DRV_RUNNING) 4472 return (EBUSY); 4473 4474 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4475 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4476 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4477 return (0); 4478 } 4479 #endif /* DEBUGNET */ 4480