1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <[email protected]> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include <sys/cdefs.h> 32 #include <sys/param.h> 33 #include <sys/eventhandler.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/sockio.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/module.h> 40 #include <sys/msan.h> 41 #include <sys/socket.h> 42 #include <sys/sysctl.h> 43 #include <sys/random.h> 44 #include <sys/sglist.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/taskqueue.h> 48 #include <sys/smp.h> 49 #include <machine/smp.h> 50 51 #include <vm/uma.h> 52 53 #include <net/debugnet.h> 54 #include <net/ethernet.h> 55 #include <net/pfil.h> 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_arp.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_media.h> 62 #include <net/if_vlan_var.h> 63 64 #include <net/bpf.h> 65 66 #include <netinet/in_systm.h> 67 #include <netinet/in.h> 68 #include <netinet/ip.h> 69 #include <netinet/ip6.h> 70 #include <netinet6/ip6_var.h> 71 #include <netinet/udp.h> 72 #include <netinet/tcp.h> 73 #include <netinet/tcp_lro.h> 74 75 #include <machine/bus.h> 76 #include <machine/resource.h> 77 #include <sys/bus.h> 78 #include <sys/rman.h> 79 80 #include <dev/virtio/virtio.h> 81 #include <dev/virtio/virtqueue.h> 82 #include <dev/virtio/network/virtio_net.h> 83 #include <dev/virtio/network/if_vtnetvar.h> 84 #include "virtio_if.h" 85 86 #include "opt_inet.h" 87 #include "opt_inet6.h" 88 89 #if defined(INET) || defined(INET6) 90 #include <machine/in_cksum.h> 91 #endif 92 93 #ifdef __NO_STRICT_ALIGNMENT 94 #define VTNET_ETHER_ALIGN 0 95 #else /* Strict alignment */ 96 #define VTNET_ETHER_ALIGN ETHER_ALIGN 97 #endif 98 99 static int vtnet_modevent(module_t, int, void *); 100 101 static int vtnet_probe(device_t); 102 static int vtnet_attach(device_t); 103 static int vtnet_detach(device_t); 104 static int vtnet_suspend(device_t); 105 static int vtnet_resume(device_t); 106 static int vtnet_shutdown(device_t); 107 static int vtnet_attach_completed(device_t); 108 static int vtnet_config_change(device_t); 109 110 static int vtnet_negotiate_features(struct vtnet_softc *); 111 static int vtnet_setup_features(struct vtnet_softc *); 112 static int vtnet_init_rxq(struct vtnet_softc *, int); 113 static int vtnet_init_txq(struct vtnet_softc *, int); 114 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 115 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 116 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 117 static void vtnet_free_rx_filters(struct vtnet_softc *); 118 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 119 static int vtnet_alloc_interface(struct vtnet_softc *); 120 static int vtnet_setup_interface(struct vtnet_softc *); 121 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 122 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 123 static int vtnet_ioctl_multi(struct vtnet_softc *); 124 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 125 static int vtnet_ioctl(if_t, u_long, caddr_t); 126 static uint64_t vtnet_get_counter(if_t, ift_counter); 127 128 static int vtnet_rxq_populate(struct vtnet_rxq *); 129 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 130 static struct mbuf * 131 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 132 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 133 struct mbuf *, int); 134 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 135 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 136 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 137 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 138 uint16_t, int, struct virtio_net_hdr *); 139 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 140 uint16_t, int, struct virtio_net_hdr *); 141 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 142 struct virtio_net_hdr *); 143 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 144 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 145 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 146 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 147 struct virtio_net_hdr *); 148 static int vtnet_rxq_eof(struct vtnet_rxq *); 149 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 150 static void vtnet_rx_vq_intr(void *); 151 static void vtnet_rxq_tq_intr(void *, int); 152 153 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 154 static int vtnet_txq_below_threshold(struct vtnet_txq *); 155 static int vtnet_txq_notify(struct vtnet_txq *); 156 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 157 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 158 int *, int *, int *); 159 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 160 int, struct virtio_net_hdr *); 161 static struct mbuf * 162 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 163 struct virtio_net_hdr *); 164 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 165 struct vtnet_tx_header *); 166 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 167 #ifdef VTNET_LEGACY_TX 168 static void vtnet_start_locked(struct vtnet_txq *, if_t); 169 static void vtnet_start(if_t); 170 #else 171 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 172 static int vtnet_txq_mq_start(if_t, struct mbuf *); 173 static void vtnet_txq_tq_deferred(void *, int); 174 #endif 175 static void vtnet_txq_start(struct vtnet_txq *); 176 static void vtnet_txq_tq_intr(void *, int); 177 static int vtnet_txq_eof(struct vtnet_txq *); 178 static void vtnet_tx_vq_intr(void *); 179 static void vtnet_tx_start_all(struct vtnet_softc *); 180 181 #ifndef VTNET_LEGACY_TX 182 static void vtnet_qflush(if_t); 183 #endif 184 185 static int vtnet_watchdog(struct vtnet_txq *); 186 static void vtnet_accum_stats(struct vtnet_softc *, 187 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 188 static void vtnet_tick(void *); 189 190 static void vtnet_start_taskqueues(struct vtnet_softc *); 191 static void vtnet_free_taskqueues(struct vtnet_softc *); 192 static void vtnet_drain_taskqueues(struct vtnet_softc *); 193 194 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 195 static void vtnet_stop_rendezvous(struct vtnet_softc *); 196 static void vtnet_stop(struct vtnet_softc *); 197 static int vtnet_virtio_reinit(struct vtnet_softc *); 198 static void vtnet_init_rx_filters(struct vtnet_softc *); 199 static int vtnet_init_rx_queues(struct vtnet_softc *); 200 static int vtnet_init_tx_queues(struct vtnet_softc *); 201 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 202 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 203 static void vtnet_update_rx_offloads(struct vtnet_softc *); 204 static int vtnet_reinit(struct vtnet_softc *); 205 static void vtnet_init_locked(struct vtnet_softc *, int); 206 static void vtnet_init(void *); 207 208 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 209 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 210 struct sglist *, int, int); 211 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 212 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 213 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 214 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 215 static int vtnet_set_promisc(struct vtnet_softc *, bool); 216 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 217 static void vtnet_rx_filter(struct vtnet_softc *); 218 static void vtnet_rx_filter_mac(struct vtnet_softc *); 219 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 220 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 221 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 222 static void vtnet_register_vlan(void *, if_t, uint16_t); 223 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 224 225 static void vtnet_update_speed_duplex(struct vtnet_softc *); 226 static int vtnet_is_link_up(struct vtnet_softc *); 227 static void vtnet_update_link_status(struct vtnet_softc *); 228 static int vtnet_ifmedia_upd(if_t); 229 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 230 static void vtnet_get_macaddr(struct vtnet_softc *); 231 static void vtnet_set_macaddr(struct vtnet_softc *); 232 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 233 static void vtnet_vlan_tag_remove(struct mbuf *); 234 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 235 236 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 237 struct sysctl_oid_list *, struct vtnet_rxq *); 238 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 239 struct sysctl_oid_list *, struct vtnet_txq *); 240 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 241 static void vtnet_load_tunables(struct vtnet_softc *); 242 static void vtnet_setup_sysctl(struct vtnet_softc *); 243 244 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 245 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 246 static int vtnet_txq_enable_intr(struct vtnet_txq *); 247 static void vtnet_txq_disable_intr(struct vtnet_txq *); 248 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 249 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 250 static void vtnet_enable_interrupts(struct vtnet_softc *); 251 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 252 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 253 static void vtnet_disable_interrupts(struct vtnet_softc *); 254 255 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 256 257 DEBUGNET_DEFINE(vtnet); 258 259 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 260 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 261 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 262 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 263 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 264 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 265 266 /* Tunables. */ 267 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 268 "VirtIO Net driver parameters"); 269 270 static int vtnet_csum_disable = 0; 271 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 272 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 273 274 static int vtnet_fixup_needs_csum = 0; 275 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 276 &vtnet_fixup_needs_csum, 0, 277 "Calculate valid checksum for NEEDS_CSUM packets"); 278 279 static int vtnet_tso_disable = 0; 280 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 281 &vtnet_tso_disable, 0, "Disables TSO"); 282 283 static int vtnet_lro_disable = 0; 284 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 285 &vtnet_lro_disable, 0, "Disables hardware LRO"); 286 287 static int vtnet_mq_disable = 0; 288 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 289 &vtnet_mq_disable, 0, "Disables multiqueue support"); 290 291 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 292 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 293 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 294 295 static int vtnet_tso_maxlen = IP_MAXPACKET; 296 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 297 &vtnet_tso_maxlen, 0, "TSO burst limit"); 298 299 static int vtnet_rx_process_limit = 1024; 300 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 301 &vtnet_rx_process_limit, 0, 302 "Number of RX segments processed in one pass"); 303 304 static int vtnet_lro_entry_count = 128; 305 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 306 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 307 308 /* Enable sorted LRO, and the depth of the mbuf queue. */ 309 static int vtnet_lro_mbufq_depth = 0; 310 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 311 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 312 313 static uma_zone_t vtnet_tx_header_zone; 314 315 static struct virtio_feature_desc vtnet_feature_desc[] = { 316 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 317 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 318 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 319 { VIRTIO_NET_F_MAC, "MAC" }, 320 { VIRTIO_NET_F_GSO, "TxGSO" }, 321 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 322 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 323 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 324 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 325 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 326 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 327 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 328 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 329 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 330 { VIRTIO_NET_F_STATUS, "Status" }, 331 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 332 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 333 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 334 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 335 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 336 { VIRTIO_NET_F_MQ, "Multiqueue" }, 337 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 338 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 339 340 { 0, NULL } 341 }; 342 343 static device_method_t vtnet_methods[] = { 344 /* Device methods. */ 345 DEVMETHOD(device_probe, vtnet_probe), 346 DEVMETHOD(device_attach, vtnet_attach), 347 DEVMETHOD(device_detach, vtnet_detach), 348 DEVMETHOD(device_suspend, vtnet_suspend), 349 DEVMETHOD(device_resume, vtnet_resume), 350 DEVMETHOD(device_shutdown, vtnet_shutdown), 351 352 /* VirtIO methods. */ 353 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 354 DEVMETHOD(virtio_config_change, vtnet_config_change), 355 356 DEVMETHOD_END 357 }; 358 359 #ifdef DEV_NETMAP 360 #include <dev/netmap/if_vtnet_netmap.h> 361 #endif 362 363 static driver_t vtnet_driver = { 364 .name = "vtnet", 365 .methods = vtnet_methods, 366 .size = sizeof(struct vtnet_softc) 367 }; 368 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 369 MODULE_VERSION(vtnet, 1); 370 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 371 #ifdef DEV_NETMAP 372 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 373 #endif 374 375 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 376 377 static int 378 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 379 { 380 int error = 0; 381 static int loaded = 0; 382 383 switch (type) { 384 case MOD_LOAD: 385 if (loaded++ == 0) { 386 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 387 sizeof(struct vtnet_tx_header), 388 NULL, NULL, NULL, NULL, 0, 0); 389 #ifdef DEBUGNET 390 /* 391 * We need to allocate from this zone in the transmit path, so ensure 392 * that we have at least one item per header available. 393 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 394 * buckets 395 */ 396 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 397 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 398 #endif 399 } 400 break; 401 case MOD_QUIESCE: 402 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 403 error = EBUSY; 404 break; 405 case MOD_UNLOAD: 406 if (--loaded == 0) { 407 uma_zdestroy(vtnet_tx_header_zone); 408 vtnet_tx_header_zone = NULL; 409 } 410 break; 411 case MOD_SHUTDOWN: 412 break; 413 default: 414 error = EOPNOTSUPP; 415 break; 416 } 417 418 return (error); 419 } 420 421 static int 422 vtnet_probe(device_t dev) 423 { 424 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 425 } 426 427 static int 428 vtnet_attach(device_t dev) 429 { 430 struct vtnet_softc *sc; 431 int error; 432 433 sc = device_get_softc(dev); 434 sc->vtnet_dev = dev; 435 virtio_set_feature_desc(dev, vtnet_feature_desc); 436 437 VTNET_CORE_LOCK_INIT(sc); 438 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 439 vtnet_load_tunables(sc); 440 441 error = vtnet_alloc_interface(sc); 442 if (error) { 443 device_printf(dev, "cannot allocate interface\n"); 444 goto fail; 445 } 446 447 vtnet_setup_sysctl(sc); 448 449 error = vtnet_setup_features(sc); 450 if (error) { 451 device_printf(dev, "cannot setup features\n"); 452 goto fail; 453 } 454 455 error = vtnet_alloc_rx_filters(sc); 456 if (error) { 457 device_printf(dev, "cannot allocate Rx filters\n"); 458 goto fail; 459 } 460 461 error = vtnet_alloc_rxtx_queues(sc); 462 if (error) { 463 device_printf(dev, "cannot allocate queues\n"); 464 goto fail; 465 } 466 467 error = vtnet_alloc_virtqueues(sc); 468 if (error) { 469 device_printf(dev, "cannot allocate virtqueues\n"); 470 goto fail; 471 } 472 473 error = vtnet_setup_interface(sc); 474 if (error) { 475 device_printf(dev, "cannot setup interface\n"); 476 goto fail; 477 } 478 479 error = virtio_setup_intr(dev, INTR_TYPE_NET); 480 if (error) { 481 device_printf(dev, "cannot setup interrupts\n"); 482 ether_ifdetach(sc->vtnet_ifp); 483 goto fail; 484 } 485 486 #ifdef DEV_NETMAP 487 vtnet_netmap_attach(sc); 488 #endif 489 vtnet_start_taskqueues(sc); 490 491 fail: 492 if (error) 493 vtnet_detach(dev); 494 495 return (error); 496 } 497 498 static int 499 vtnet_detach(device_t dev) 500 { 501 struct vtnet_softc *sc; 502 if_t ifp; 503 504 sc = device_get_softc(dev); 505 ifp = sc->vtnet_ifp; 506 507 if (device_is_attached(dev)) { 508 VTNET_CORE_LOCK(sc); 509 vtnet_stop(sc); 510 VTNET_CORE_UNLOCK(sc); 511 512 callout_drain(&sc->vtnet_tick_ch); 513 vtnet_drain_taskqueues(sc); 514 515 ether_ifdetach(ifp); 516 } 517 518 #ifdef DEV_NETMAP 519 netmap_detach(ifp); 520 #endif 521 522 if (sc->vtnet_pfil != NULL) { 523 pfil_head_unregister(sc->vtnet_pfil); 524 sc->vtnet_pfil = NULL; 525 } 526 527 vtnet_free_taskqueues(sc); 528 529 if (sc->vtnet_vlan_attach != NULL) { 530 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 531 sc->vtnet_vlan_attach = NULL; 532 } 533 if (sc->vtnet_vlan_detach != NULL) { 534 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 535 sc->vtnet_vlan_detach = NULL; 536 } 537 538 ifmedia_removeall(&sc->vtnet_media); 539 540 if (ifp != NULL) { 541 if_free(ifp); 542 sc->vtnet_ifp = NULL; 543 } 544 545 vtnet_free_rxtx_queues(sc); 546 vtnet_free_rx_filters(sc); 547 548 if (sc->vtnet_ctrl_vq != NULL) 549 vtnet_free_ctrl_vq(sc); 550 551 VTNET_CORE_LOCK_DESTROY(sc); 552 553 return (0); 554 } 555 556 static int 557 vtnet_suspend(device_t dev) 558 { 559 struct vtnet_softc *sc; 560 561 sc = device_get_softc(dev); 562 563 VTNET_CORE_LOCK(sc); 564 vtnet_stop(sc); 565 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 566 VTNET_CORE_UNLOCK(sc); 567 568 return (0); 569 } 570 571 static int 572 vtnet_resume(device_t dev) 573 { 574 struct vtnet_softc *sc; 575 if_t ifp; 576 577 sc = device_get_softc(dev); 578 ifp = sc->vtnet_ifp; 579 580 VTNET_CORE_LOCK(sc); 581 if (if_getflags(ifp) & IFF_UP) 582 vtnet_init_locked(sc, 0); 583 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 584 VTNET_CORE_UNLOCK(sc); 585 586 return (0); 587 } 588 589 static int 590 vtnet_shutdown(device_t dev) 591 { 592 /* 593 * Suspend already does all of what we need to 594 * do here; we just never expect to be resumed. 595 */ 596 return (vtnet_suspend(dev)); 597 } 598 599 static int 600 vtnet_attach_completed(device_t dev) 601 { 602 struct vtnet_softc *sc; 603 604 sc = device_get_softc(dev); 605 606 VTNET_CORE_LOCK(sc); 607 vtnet_attached_set_macaddr(sc); 608 VTNET_CORE_UNLOCK(sc); 609 610 return (0); 611 } 612 613 static int 614 vtnet_config_change(device_t dev) 615 { 616 struct vtnet_softc *sc; 617 618 sc = device_get_softc(dev); 619 620 VTNET_CORE_LOCK(sc); 621 vtnet_update_link_status(sc); 622 if (sc->vtnet_link_active != 0) 623 vtnet_tx_start_all(sc); 624 VTNET_CORE_UNLOCK(sc); 625 626 return (0); 627 } 628 629 static int 630 vtnet_negotiate_features(struct vtnet_softc *sc) 631 { 632 device_t dev; 633 uint64_t features, negotiated_features; 634 int no_csum; 635 636 dev = sc->vtnet_dev; 637 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 638 VTNET_LEGACY_FEATURES; 639 640 /* 641 * TSO and LRO are only available when their corresponding checksum 642 * offload feature is also negotiated. 643 */ 644 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 645 if (no_csum) 646 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 647 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 648 features &= ~VTNET_TSO_FEATURES; 649 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 650 features &= ~VTNET_LRO_FEATURES; 651 652 #ifndef VTNET_LEGACY_TX 653 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 654 features &= ~VIRTIO_NET_F_MQ; 655 #else 656 features &= ~VIRTIO_NET_F_MQ; 657 #endif 658 659 negotiated_features = virtio_negotiate_features(dev, features); 660 661 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 662 uint16_t mtu; 663 664 mtu = virtio_read_dev_config_2(dev, 665 offsetof(struct virtio_net_config, mtu)); 666 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) { 667 device_printf(dev, "Invalid MTU value: %d. " 668 "MTU feature disabled.\n", mtu); 669 features &= ~VIRTIO_NET_F_MTU; 670 negotiated_features = 671 virtio_negotiate_features(dev, features); 672 } 673 } 674 675 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 676 uint16_t npairs; 677 678 npairs = virtio_read_dev_config_2(dev, 679 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 680 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 681 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 682 device_printf(dev, "Invalid max_virtqueue_pairs value: " 683 "%d. Multiqueue feature disabled.\n", npairs); 684 features &= ~VIRTIO_NET_F_MQ; 685 negotiated_features = 686 virtio_negotiate_features(dev, features); 687 } 688 } 689 690 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 691 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 692 /* 693 * LRO without mergeable buffers requires special care. This 694 * is not ideal because every receive buffer must be large 695 * enough to hold the maximum TCP packet, the Ethernet header, 696 * and the header. This requires up to 34 descriptors with 697 * MCLBYTES clusters. If we do not have indirect descriptors, 698 * LRO is disabled since the virtqueue will not contain very 699 * many receive buffers. 700 */ 701 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 702 device_printf(dev, 703 "Host LRO disabled since both mergeable buffers " 704 "and indirect descriptors were not negotiated\n"); 705 features &= ~VTNET_LRO_FEATURES; 706 negotiated_features = 707 virtio_negotiate_features(dev, features); 708 } else 709 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 710 } 711 712 sc->vtnet_features = negotiated_features; 713 sc->vtnet_negotiated_features = negotiated_features; 714 715 return (virtio_finalize_features(dev)); 716 } 717 718 static int 719 vtnet_setup_features(struct vtnet_softc *sc) 720 { 721 device_t dev; 722 int error; 723 724 dev = sc->vtnet_dev; 725 726 error = vtnet_negotiate_features(sc); 727 if (error) 728 return (error); 729 730 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 731 sc->vtnet_flags |= VTNET_FLAG_MODERN; 732 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 733 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 734 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 735 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 736 737 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 738 /* This feature should always be negotiated. */ 739 sc->vtnet_flags |= VTNET_FLAG_MAC; 740 } 741 742 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 743 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 744 offsetof(struct virtio_net_config, mtu)); 745 } else 746 sc->vtnet_max_mtu = VTNET_MAX_MTU; 747 748 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 749 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 750 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 751 } else if (vtnet_modern(sc)) { 752 /* This is identical to the mergeable header. */ 753 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 754 } else 755 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 756 757 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 758 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 759 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 760 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 761 else 762 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 763 764 /* 765 * Favor "hardware" LRO if negotiated, but support software LRO as 766 * a fallback; there is usually little benefit (or worse) with both. 767 */ 768 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 769 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 770 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 771 772 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 773 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 774 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 775 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 776 else 777 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 778 779 sc->vtnet_req_vq_pairs = 1; 780 sc->vtnet_max_vq_pairs = 1; 781 782 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 783 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 784 785 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 786 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 787 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 788 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 789 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 790 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 791 792 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 793 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 794 offsetof(struct virtio_net_config, 795 max_virtqueue_pairs)); 796 } 797 } 798 799 if (sc->vtnet_max_vq_pairs > 1) { 800 int req; 801 802 /* 803 * Limit the maximum number of requested queue pairs to the 804 * number of CPUs and the configured maximum. 805 */ 806 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 807 if (req < 0) 808 req = 1; 809 if (req == 0) 810 req = mp_ncpus; 811 if (req > sc->vtnet_max_vq_pairs) 812 req = sc->vtnet_max_vq_pairs; 813 if (req > mp_ncpus) 814 req = mp_ncpus; 815 if (req > 1) { 816 sc->vtnet_req_vq_pairs = req; 817 sc->vtnet_flags |= VTNET_FLAG_MQ; 818 } 819 } 820 821 return (0); 822 } 823 824 static int 825 vtnet_init_rxq(struct vtnet_softc *sc, int id) 826 { 827 struct vtnet_rxq *rxq; 828 829 rxq = &sc->vtnet_rxqs[id]; 830 831 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 832 device_get_nameunit(sc->vtnet_dev), id); 833 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 834 835 rxq->vtnrx_sc = sc; 836 rxq->vtnrx_id = id; 837 838 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 839 if (rxq->vtnrx_sg == NULL) 840 return (ENOMEM); 841 842 #if defined(INET) || defined(INET6) 843 if (vtnet_software_lro(sc)) { 844 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 845 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 846 return (ENOMEM); 847 } 848 #endif 849 850 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 851 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 852 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 853 854 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 855 } 856 857 static int 858 vtnet_init_txq(struct vtnet_softc *sc, int id) 859 { 860 struct vtnet_txq *txq; 861 862 txq = &sc->vtnet_txqs[id]; 863 864 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 865 device_get_nameunit(sc->vtnet_dev), id); 866 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 867 868 txq->vtntx_sc = sc; 869 txq->vtntx_id = id; 870 871 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 872 if (txq->vtntx_sg == NULL) 873 return (ENOMEM); 874 875 #ifndef VTNET_LEGACY_TX 876 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 877 M_NOWAIT, &txq->vtntx_mtx); 878 if (txq->vtntx_br == NULL) 879 return (ENOMEM); 880 881 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 882 #endif 883 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 884 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 885 taskqueue_thread_enqueue, &txq->vtntx_tq); 886 if (txq->vtntx_tq == NULL) 887 return (ENOMEM); 888 889 return (0); 890 } 891 892 static int 893 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 894 { 895 int i, npairs, error; 896 897 npairs = sc->vtnet_max_vq_pairs; 898 899 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 900 M_NOWAIT | M_ZERO); 901 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 902 M_NOWAIT | M_ZERO); 903 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 904 return (ENOMEM); 905 906 for (i = 0; i < npairs; i++) { 907 error = vtnet_init_rxq(sc, i); 908 if (error) 909 return (error); 910 error = vtnet_init_txq(sc, i); 911 if (error) 912 return (error); 913 } 914 915 vtnet_set_rx_process_limit(sc); 916 vtnet_setup_queue_sysctl(sc); 917 918 return (0); 919 } 920 921 static void 922 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 923 { 924 925 rxq->vtnrx_sc = NULL; 926 rxq->vtnrx_id = -1; 927 928 #if defined(INET) || defined(INET6) 929 tcp_lro_free(&rxq->vtnrx_lro); 930 #endif 931 932 if (rxq->vtnrx_sg != NULL) { 933 sglist_free(rxq->vtnrx_sg); 934 rxq->vtnrx_sg = NULL; 935 } 936 937 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 938 mtx_destroy(&rxq->vtnrx_mtx); 939 } 940 941 static void 942 vtnet_destroy_txq(struct vtnet_txq *txq) 943 { 944 945 txq->vtntx_sc = NULL; 946 txq->vtntx_id = -1; 947 948 if (txq->vtntx_sg != NULL) { 949 sglist_free(txq->vtntx_sg); 950 txq->vtntx_sg = NULL; 951 } 952 953 #ifndef VTNET_LEGACY_TX 954 if (txq->vtntx_br != NULL) { 955 buf_ring_free(txq->vtntx_br, M_DEVBUF); 956 txq->vtntx_br = NULL; 957 } 958 #endif 959 960 if (mtx_initialized(&txq->vtntx_mtx) != 0) 961 mtx_destroy(&txq->vtntx_mtx); 962 } 963 964 static void 965 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 966 { 967 int i; 968 969 if (sc->vtnet_rxqs != NULL) { 970 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 971 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 972 free(sc->vtnet_rxqs, M_DEVBUF); 973 sc->vtnet_rxqs = NULL; 974 } 975 976 if (sc->vtnet_txqs != NULL) { 977 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 978 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 979 free(sc->vtnet_txqs, M_DEVBUF); 980 sc->vtnet_txqs = NULL; 981 } 982 } 983 984 static int 985 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 986 { 987 988 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 989 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 990 M_DEVBUF, M_NOWAIT | M_ZERO); 991 if (sc->vtnet_mac_filter == NULL) 992 return (ENOMEM); 993 } 994 995 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 996 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 997 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 998 if (sc->vtnet_vlan_filter == NULL) 999 return (ENOMEM); 1000 } 1001 1002 return (0); 1003 } 1004 1005 static void 1006 vtnet_free_rx_filters(struct vtnet_softc *sc) 1007 { 1008 1009 if (sc->vtnet_mac_filter != NULL) { 1010 free(sc->vtnet_mac_filter, M_DEVBUF); 1011 sc->vtnet_mac_filter = NULL; 1012 } 1013 1014 if (sc->vtnet_vlan_filter != NULL) { 1015 free(sc->vtnet_vlan_filter, M_DEVBUF); 1016 sc->vtnet_vlan_filter = NULL; 1017 } 1018 } 1019 1020 static int 1021 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1022 { 1023 device_t dev; 1024 struct vq_alloc_info *info; 1025 struct vtnet_rxq *rxq; 1026 struct vtnet_txq *txq; 1027 int i, idx, flags, nvqs, error; 1028 1029 dev = sc->vtnet_dev; 1030 flags = 0; 1031 1032 nvqs = sc->vtnet_max_vq_pairs * 2; 1033 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1034 nvqs++; 1035 1036 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1037 if (info == NULL) 1038 return (ENOMEM); 1039 1040 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1041 rxq = &sc->vtnet_rxqs[i]; 1042 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1043 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1044 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1045 1046 txq = &sc->vtnet_txqs[i]; 1047 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs, 1048 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1049 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1050 } 1051 1052 /* These queues will not be used so allocate the minimum resources. */ 1053 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1054 rxq = &sc->vtnet_rxqs[i]; 1055 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1056 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1057 1058 txq = &sc->vtnet_txqs[i]; 1059 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq, 1060 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1061 } 1062 1063 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1064 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1065 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1066 } 1067 1068 /* 1069 * TODO: Enable interrupt binding if this is multiqueue. This will 1070 * only matter when per-virtqueue MSIX is available. 1071 */ 1072 if (sc->vtnet_flags & VTNET_FLAG_MQ) 1073 flags |= 0; 1074 1075 error = virtio_alloc_virtqueues(dev, flags, nvqs, info); 1076 free(info, M_TEMP); 1077 1078 return (error); 1079 } 1080 1081 static int 1082 vtnet_alloc_interface(struct vtnet_softc *sc) 1083 { 1084 device_t dev; 1085 if_t ifp; 1086 1087 dev = sc->vtnet_dev; 1088 1089 ifp = if_alloc(IFT_ETHER); 1090 if (ifp == NULL) 1091 return (ENOMEM); 1092 1093 sc->vtnet_ifp = ifp; 1094 if_setsoftc(ifp, sc); 1095 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1096 1097 return (0); 1098 } 1099 1100 static int 1101 vtnet_setup_interface(struct vtnet_softc *sc) 1102 { 1103 device_t dev; 1104 struct pfil_head_args pa; 1105 if_t ifp; 1106 1107 dev = sc->vtnet_dev; 1108 ifp = sc->vtnet_ifp; 1109 1110 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1111 if_setbaudrate(ifp, IF_Gbps(10)); 1112 if_setinitfn(ifp, vtnet_init); 1113 if_setioctlfn(ifp, vtnet_ioctl); 1114 if_setgetcounterfn(ifp, vtnet_get_counter); 1115 #ifndef VTNET_LEGACY_TX 1116 if_settransmitfn(ifp, vtnet_txq_mq_start); 1117 if_setqflushfn(ifp, vtnet_qflush); 1118 #else 1119 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1120 if_setstartfn(ifp, vtnet_start); 1121 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1122 if_setsendqready(ifp); 1123 #endif 1124 1125 vtnet_get_macaddr(sc); 1126 1127 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1128 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1129 1130 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1131 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1132 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1133 1134 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1135 int gso; 1136 1137 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1138 1139 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1140 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1141 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1142 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1143 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1144 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1145 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1146 1147 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1148 int tso_maxlen; 1149 1150 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1151 1152 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1153 vtnet_tso_maxlen); 1154 if_sethwtsomax(ifp, tso_maxlen - 1155 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1156 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1157 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1158 } 1159 } 1160 1161 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1162 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1163 #ifdef notyet 1164 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1165 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1166 #endif 1167 1168 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1169 vtnet_fixup_needs_csum) != 0) 1170 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1171 1172 /* Support either "hardware" or software LRO. */ 1173 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1174 } 1175 1176 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1177 /* 1178 * VirtIO does not support VLAN tagging, but we can fake 1179 * it by inserting and removing the 802.1Q header during 1180 * transmit and receive. We are then able to do checksum 1181 * offloading of VLAN frames. 1182 */ 1183 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1184 } 1185 1186 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1187 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1188 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1189 1190 /* 1191 * Capabilities after here are not enabled by default. 1192 */ 1193 if_setcapenable(ifp, if_getcapabilities(ifp)); 1194 1195 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1196 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1197 1198 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1199 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1200 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1201 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1202 } 1203 1204 ether_ifattach(ifp, sc->vtnet_hwaddr); 1205 1206 /* Tell the upper layer(s) we support long frames. */ 1207 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1208 1209 DEBUGNET_SET(ifp, vtnet); 1210 1211 pa.pa_version = PFIL_VERSION; 1212 pa.pa_flags = PFIL_IN; 1213 pa.pa_type = PFIL_TYPE_ETHERNET; 1214 pa.pa_headname = if_name(ifp); 1215 sc->vtnet_pfil = pfil_head_register(&pa); 1216 1217 return (0); 1218 } 1219 1220 static int 1221 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1222 { 1223 int framesz; 1224 1225 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1226 return (MJUMPAGESIZE); 1227 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1228 return (MCLBYTES); 1229 1230 /* 1231 * Try to scale the receive mbuf cluster size from the MTU. We 1232 * could also use the VQ size to influence the selected size, 1233 * but that would only matter for very small queues. 1234 */ 1235 if (vtnet_modern(sc)) { 1236 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1237 framesz = sizeof(struct virtio_net_hdr_v1); 1238 } else 1239 framesz = sizeof(struct vtnet_rx_header); 1240 framesz += sizeof(struct ether_vlan_header) + mtu; 1241 /* 1242 * Account for the offsetting we'll do elsewhere so we allocate the 1243 * right size for the mtu. 1244 */ 1245 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1246 framesz += VTNET_ETHER_ALIGN; 1247 } 1248 1249 if (framesz <= MCLBYTES) 1250 return (MCLBYTES); 1251 else if (framesz <= MJUMPAGESIZE) 1252 return (MJUMPAGESIZE); 1253 else if (framesz <= MJUM9BYTES) 1254 return (MJUM9BYTES); 1255 1256 /* Sane default; avoid 16KB clusters. */ 1257 return (MCLBYTES); 1258 } 1259 1260 static int 1261 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1262 { 1263 if_t ifp; 1264 int clustersz; 1265 1266 ifp = sc->vtnet_ifp; 1267 VTNET_CORE_LOCK_ASSERT(sc); 1268 1269 if (if_getmtu(ifp) == mtu) 1270 return (0); 1271 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1272 return (EINVAL); 1273 1274 if_setmtu(ifp, mtu); 1275 clustersz = vtnet_rx_cluster_size(sc, mtu); 1276 1277 if (clustersz != sc->vtnet_rx_clustersz && 1278 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1279 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1280 vtnet_init_locked(sc, 0); 1281 } 1282 1283 return (0); 1284 } 1285 1286 static int 1287 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1288 { 1289 if_t ifp; 1290 int drv_running; 1291 1292 ifp = sc->vtnet_ifp; 1293 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1294 1295 VTNET_CORE_LOCK_ASSERT(sc); 1296 1297 if ((if_getflags(ifp) & IFF_UP) == 0) { 1298 if (drv_running) 1299 vtnet_stop(sc); 1300 goto out; 1301 } 1302 1303 if (!drv_running) { 1304 vtnet_init_locked(sc, 0); 1305 goto out; 1306 } 1307 1308 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1309 (IFF_PROMISC | IFF_ALLMULTI)) { 1310 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1311 vtnet_rx_filter(sc); 1312 else { 1313 /* 1314 * We don't support filtering out multicast, so 1315 * ALLMULTI is always set. 1316 */ 1317 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1318 if_setflagbits(ifp, IFF_PROMISC, 0); 1319 } 1320 } 1321 1322 out: 1323 sc->vtnet_if_flags = if_getflags(ifp); 1324 return (0); 1325 } 1326 1327 static int 1328 vtnet_ioctl_multi(struct vtnet_softc *sc) 1329 { 1330 if_t ifp; 1331 1332 ifp = sc->vtnet_ifp; 1333 1334 VTNET_CORE_LOCK_ASSERT(sc); 1335 1336 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1337 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1338 vtnet_rx_filter_mac(sc); 1339 1340 return (0); 1341 } 1342 1343 static int 1344 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1345 { 1346 if_t ifp; 1347 int mask, reinit, update; 1348 1349 ifp = sc->vtnet_ifp; 1350 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1351 reinit = update = 0; 1352 1353 VTNET_CORE_LOCK_ASSERT(sc); 1354 1355 if (mask & IFCAP_TXCSUM) 1356 if_togglecapenable(ifp, IFCAP_TXCSUM); 1357 if (mask & IFCAP_TXCSUM_IPV6) 1358 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1359 if (mask & IFCAP_TSO4) 1360 if_togglecapenable(ifp, IFCAP_TSO4); 1361 if (mask & IFCAP_TSO6) 1362 if_togglecapenable(ifp, IFCAP_TSO6); 1363 1364 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1365 /* 1366 * These Rx features require the negotiated features to 1367 * be updated. Avoid a full reinit if possible. 1368 */ 1369 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1370 update = 1; 1371 else 1372 reinit = 1; 1373 1374 /* BMV: Avoid needless renegotiation for just software LRO. */ 1375 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1376 IFCAP_LRO && vtnet_software_lro(sc)) 1377 reinit = update = 0; 1378 1379 if (mask & IFCAP_RXCSUM) 1380 if_togglecapenable(ifp, IFCAP_RXCSUM); 1381 if (mask & IFCAP_RXCSUM_IPV6) 1382 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1383 if (mask & IFCAP_LRO) 1384 if_togglecapenable(ifp, IFCAP_LRO); 1385 1386 /* 1387 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1388 * so treat them as a pair. Guest TSO (LRO) requires receive 1389 * checksums. 1390 */ 1391 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1392 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1393 #ifdef notyet 1394 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1395 #endif 1396 } else 1397 if_setcapenablebit(ifp, 0, 1398 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1399 } 1400 1401 if (mask & IFCAP_VLAN_HWFILTER) { 1402 /* These Rx features require renegotiation. */ 1403 reinit = 1; 1404 1405 if (mask & IFCAP_VLAN_HWFILTER) 1406 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1407 } 1408 1409 if (mask & IFCAP_VLAN_HWTSO) 1410 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1411 if (mask & IFCAP_VLAN_HWTAGGING) 1412 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1413 1414 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1415 if (reinit) { 1416 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1417 vtnet_init_locked(sc, 0); 1418 } else if (update) 1419 vtnet_update_rx_offloads(sc); 1420 } 1421 1422 return (0); 1423 } 1424 1425 static int 1426 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1427 { 1428 struct vtnet_softc *sc; 1429 struct ifreq *ifr; 1430 int error; 1431 1432 sc = if_getsoftc(ifp); 1433 ifr = (struct ifreq *) data; 1434 error = 0; 1435 1436 switch (cmd) { 1437 case SIOCSIFMTU: 1438 VTNET_CORE_LOCK(sc); 1439 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1440 VTNET_CORE_UNLOCK(sc); 1441 break; 1442 1443 case SIOCSIFFLAGS: 1444 VTNET_CORE_LOCK(sc); 1445 error = vtnet_ioctl_ifflags(sc); 1446 VTNET_CORE_UNLOCK(sc); 1447 break; 1448 1449 case SIOCADDMULTI: 1450 case SIOCDELMULTI: 1451 VTNET_CORE_LOCK(sc); 1452 error = vtnet_ioctl_multi(sc); 1453 VTNET_CORE_UNLOCK(sc); 1454 break; 1455 1456 case SIOCSIFMEDIA: 1457 case SIOCGIFMEDIA: 1458 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1459 break; 1460 1461 case SIOCSIFCAP: 1462 VTNET_CORE_LOCK(sc); 1463 error = vtnet_ioctl_ifcap(sc, ifr); 1464 VTNET_CORE_UNLOCK(sc); 1465 VLAN_CAPABILITIES(ifp); 1466 break; 1467 1468 default: 1469 error = ether_ioctl(ifp, cmd, data); 1470 break; 1471 } 1472 1473 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1474 1475 return (error); 1476 } 1477 1478 static int 1479 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1480 { 1481 struct virtqueue *vq; 1482 int nbufs, error; 1483 1484 #ifdef DEV_NETMAP 1485 error = vtnet_netmap_rxq_populate(rxq); 1486 if (error >= 0) 1487 return (error); 1488 #endif /* DEV_NETMAP */ 1489 1490 vq = rxq->vtnrx_vq; 1491 error = ENOSPC; 1492 1493 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1494 error = vtnet_rxq_new_buf(rxq); 1495 if (error) 1496 break; 1497 } 1498 1499 if (nbufs > 0) { 1500 virtqueue_notify(vq); 1501 /* 1502 * EMSGSIZE signifies the virtqueue did not have enough 1503 * entries available to hold the last mbuf. This is not 1504 * an error. 1505 */ 1506 if (error == EMSGSIZE) 1507 error = 0; 1508 } 1509 1510 return (error); 1511 } 1512 1513 static void 1514 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1515 { 1516 struct virtqueue *vq; 1517 struct mbuf *m; 1518 int last; 1519 #ifdef DEV_NETMAP 1520 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1521 rxq->vtnrx_id, NR_RX); 1522 #else /* !DEV_NETMAP */ 1523 void *kring = NULL; 1524 #endif /* !DEV_NETMAP */ 1525 1526 vq = rxq->vtnrx_vq; 1527 last = 0; 1528 1529 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1530 if (kring == NULL) 1531 m_freem(m); 1532 } 1533 1534 KASSERT(virtqueue_empty(vq), 1535 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1536 } 1537 1538 static struct mbuf * 1539 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1540 { 1541 struct mbuf *m_head, *m_tail, *m; 1542 int i, size; 1543 1544 m_head = NULL; 1545 size = sc->vtnet_rx_clustersz; 1546 1547 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1548 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1549 1550 for (i = 0; i < nbufs; i++) { 1551 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1552 if (m == NULL) { 1553 sc->vtnet_stats.mbuf_alloc_failed++; 1554 m_freem(m_head); 1555 return (NULL); 1556 } 1557 1558 m->m_len = size; 1559 /* 1560 * Need to offset the mbuf if the header we're going to add 1561 * will misalign. 1562 */ 1563 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1564 m_adj(m, VTNET_ETHER_ALIGN); 1565 } 1566 if (m_head != NULL) { 1567 m_tail->m_next = m; 1568 m_tail = m; 1569 } else 1570 m_head = m_tail = m; 1571 } 1572 1573 if (m_tailp != NULL) 1574 *m_tailp = m_tail; 1575 1576 return (m_head); 1577 } 1578 1579 /* 1580 * Slow path for when LRO without mergeable buffers is negotiated. 1581 */ 1582 static int 1583 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1584 int len0) 1585 { 1586 struct vtnet_softc *sc; 1587 struct mbuf *m, *m_prev, *m_new, *m_tail; 1588 int len, clustersz, nreplace, error; 1589 1590 sc = rxq->vtnrx_sc; 1591 clustersz = sc->vtnet_rx_clustersz; 1592 /* 1593 * Need to offset the mbuf if the header we're going to add will 1594 * misalign, account for that here. 1595 */ 1596 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) 1597 clustersz -= VTNET_ETHER_ALIGN; 1598 1599 m_prev = NULL; 1600 m_tail = NULL; 1601 nreplace = 0; 1602 1603 m = m0; 1604 len = len0; 1605 1606 /* 1607 * Since these mbuf chains are so large, avoid allocating a complete 1608 * replacement when the received frame did not consume the entire 1609 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1610 */ 1611 while (len > 0) { 1612 if (m == NULL) { 1613 sc->vtnet_stats.rx_frame_too_large++; 1614 return (EMSGSIZE); 1615 } 1616 1617 /* 1618 * Every mbuf should have the expected cluster size since that 1619 * is also used to allocate the replacements. 1620 */ 1621 KASSERT(m->m_len == clustersz, 1622 ("%s: mbuf size %d not expected cluster size %d", __func__, 1623 m->m_len, clustersz)); 1624 1625 m->m_len = MIN(m->m_len, len); 1626 len -= m->m_len; 1627 1628 m_prev = m; 1629 m = m->m_next; 1630 nreplace++; 1631 } 1632 1633 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1634 ("%s: invalid replacement mbuf count %d max %d", __func__, 1635 nreplace, sc->vtnet_rx_nmbufs)); 1636 1637 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1638 if (m_new == NULL) { 1639 m_prev->m_len = clustersz; 1640 return (ENOBUFS); 1641 } 1642 1643 /* 1644 * Move any unused mbufs from the received mbuf chain onto the 1645 * end of the replacement chain. 1646 */ 1647 if (m_prev->m_next != NULL) { 1648 m_tail->m_next = m_prev->m_next; 1649 m_prev->m_next = NULL; 1650 } 1651 1652 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1653 if (error) { 1654 /* 1655 * The replacement is suppose to be an copy of the one 1656 * dequeued so this is a very unexpected error. 1657 * 1658 * Restore the m0 chain to the original state if it was 1659 * modified so we can then discard it. 1660 */ 1661 if (m_tail->m_next != NULL) { 1662 m_prev->m_next = m_tail->m_next; 1663 m_tail->m_next = NULL; 1664 } 1665 m_prev->m_len = clustersz; 1666 sc->vtnet_stats.rx_enq_replacement_failed++; 1667 m_freem(m_new); 1668 } 1669 1670 return (error); 1671 } 1672 1673 static int 1674 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1675 { 1676 struct vtnet_softc *sc; 1677 struct mbuf *m_new; 1678 int error; 1679 1680 sc = rxq->vtnrx_sc; 1681 1682 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1683 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1684 1685 MPASS(m->m_next == NULL); 1686 if (m->m_len < len) 1687 return (EMSGSIZE); 1688 1689 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1690 if (m_new == NULL) 1691 return (ENOBUFS); 1692 1693 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1694 if (error) { 1695 sc->vtnet_stats.rx_enq_replacement_failed++; 1696 m_freem(m_new); 1697 } else 1698 m->m_len = len; 1699 1700 return (error); 1701 } 1702 1703 static int 1704 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1705 { 1706 struct vtnet_softc *sc; 1707 struct sglist *sg; 1708 int header_inlined, error; 1709 1710 sc = rxq->vtnrx_sc; 1711 sg = rxq->vtnrx_sg; 1712 1713 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1714 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1715 VTNET_RXQ_LOCK_ASSERT(rxq); 1716 1717 sglist_reset(sg); 1718 header_inlined = vtnet_modern(sc) || 1719 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1720 1721 /* 1722 * Note: The mbuf has been already adjusted when we allocate it if we 1723 * have to do strict alignment. 1724 */ 1725 if (header_inlined) 1726 error = sglist_append_mbuf(sg, m); 1727 else { 1728 struct vtnet_rx_header *rxhdr = 1729 mtod(m, struct vtnet_rx_header *); 1730 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1731 1732 /* Append the header and remaining mbuf data. */ 1733 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1734 if (error) 1735 return (error); 1736 error = sglist_append(sg, &rxhdr[1], 1737 m->m_len - sizeof(struct vtnet_rx_header)); 1738 if (error) 1739 return (error); 1740 1741 if (m->m_next != NULL) 1742 error = sglist_append_mbuf(sg, m->m_next); 1743 } 1744 1745 if (error) 1746 return (error); 1747 1748 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1749 } 1750 1751 static int 1752 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1753 { 1754 struct vtnet_softc *sc; 1755 struct mbuf *m; 1756 int error; 1757 1758 sc = rxq->vtnrx_sc; 1759 1760 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1761 if (m == NULL) 1762 return (ENOBUFS); 1763 1764 error = vtnet_rxq_enqueue_buf(rxq, m); 1765 if (error) 1766 m_freem(m); 1767 1768 return (error); 1769 } 1770 1771 static int 1772 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype, 1773 int hoff, struct virtio_net_hdr *hdr) 1774 { 1775 struct vtnet_softc *sc; 1776 int error; 1777 1778 sc = rxq->vtnrx_sc; 1779 1780 /* 1781 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does 1782 * not have an analogous CSUM flag. The checksum has been validated, 1783 * but is incomplete (TCP/UDP pseudo header). 1784 * 1785 * The packet is likely from another VM on the same host that itself 1786 * performed checksum offloading so Tx/Rx is basically a memcpy and 1787 * the checksum has little value. 1788 * 1789 * Default to receiving the packet as-is for performance reasons, but 1790 * this can cause issues if the packet is to be forwarded because it 1791 * does not contain a valid checksum. This patch may be helpful: 1792 * https://reviews.freebsd.org/D6611. In the meantime, have the driver 1793 * compute the checksum if requested. 1794 * 1795 * BMV: Need to add an CSUM_PARTIAL flag? 1796 */ 1797 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1798 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr); 1799 return (error); 1800 } 1801 1802 /* 1803 * Compute the checksum in the driver so the packet will contain a 1804 * valid checksum. The checksum is at csum_offset from csum_start. 1805 */ 1806 switch (etype) { 1807 #if defined(INET) || defined(INET6) 1808 case ETHERTYPE_IP: 1809 case ETHERTYPE_IPV6: { 1810 int csum_off, csum_end; 1811 uint16_t csum; 1812 1813 csum_off = hdr->csum_start + hdr->csum_offset; 1814 csum_end = csum_off + sizeof(uint16_t); 1815 1816 /* Assume checksum will be in the first mbuf. */ 1817 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) 1818 return (1); 1819 1820 /* 1821 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1822 * checksum and write it at the specified offset. We could 1823 * try to verify the packet: csum_start should probably 1824 * correspond to the start of the TCP/UDP header. 1825 * 1826 * BMV: Need to properly handle UDP with zero checksum. Is 1827 * the IPv4 header checksum implicitly validated? 1828 */ 1829 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1830 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1831 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1832 m->m_pkthdr.csum_data = 0xFFFF; 1833 break; 1834 } 1835 #endif 1836 default: 1837 sc->vtnet_stats.rx_csum_bad_ethtype++; 1838 return (1); 1839 } 1840 1841 return (0); 1842 } 1843 1844 static int 1845 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, 1846 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused) 1847 { 1848 #if 0 1849 struct vtnet_softc *sc; 1850 #endif 1851 int protocol; 1852 1853 #if 0 1854 sc = rxq->vtnrx_sc; 1855 #endif 1856 1857 switch (etype) { 1858 #if defined(INET) 1859 case ETHERTYPE_IP: 1860 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) 1861 protocol = IPPROTO_DONE; 1862 else { 1863 struct ip *ip = (struct ip *)(m->m_data + hoff); 1864 protocol = ip->ip_p; 1865 } 1866 break; 1867 #endif 1868 #if defined(INET6) 1869 case ETHERTYPE_IPV6: 1870 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1871 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) 1872 protocol = IPPROTO_DONE; 1873 break; 1874 #endif 1875 default: 1876 protocol = IPPROTO_DONE; 1877 break; 1878 } 1879 1880 switch (protocol) { 1881 case IPPROTO_TCP: 1882 case IPPROTO_UDP: 1883 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1884 m->m_pkthdr.csum_data = 0xFFFF; 1885 break; 1886 default: 1887 /* 1888 * FreeBSD does not support checksum offloading of this 1889 * protocol. Let the stack re-verify the checksum later 1890 * if the protocol is supported. 1891 */ 1892 #if 0 1893 if_printf(sc->vtnet_ifp, 1894 "%s: checksum offload of unsupported protocol " 1895 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n", 1896 __func__, etype, protocol, hdr->csum_start, 1897 hdr->csum_offset); 1898 #endif 1899 break; 1900 } 1901 1902 return (0); 1903 } 1904 1905 static int 1906 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1907 struct virtio_net_hdr *hdr) 1908 { 1909 const struct ether_header *eh; 1910 int hoff; 1911 uint16_t etype; 1912 1913 eh = mtod(m, const struct ether_header *); 1914 etype = ntohs(eh->ether_type); 1915 if (etype == ETHERTYPE_VLAN) { 1916 /* TODO BMV: Handle QinQ. */ 1917 const struct ether_vlan_header *evh = 1918 mtod(m, const struct ether_vlan_header *); 1919 etype = ntohs(evh->evl_proto); 1920 hoff = sizeof(struct ether_vlan_header); 1921 } else 1922 hoff = sizeof(struct ether_header); 1923 1924 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1925 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr)); 1926 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1927 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr)); 1928 } 1929 1930 static void 1931 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1932 { 1933 struct mbuf *m; 1934 1935 while (--nbufs > 0) { 1936 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1937 if (m == NULL) 1938 break; 1939 vtnet_rxq_discard_buf(rxq, m); 1940 } 1941 } 1942 1943 static void 1944 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1945 { 1946 int error __diagused; 1947 1948 /* 1949 * Requeue the discarded mbuf. This should always be successful 1950 * since it was just dequeued. 1951 */ 1952 error = vtnet_rxq_enqueue_buf(rxq, m); 1953 KASSERT(error == 0, 1954 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1955 } 1956 1957 static int 1958 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1959 { 1960 struct vtnet_softc *sc; 1961 struct virtqueue *vq; 1962 struct mbuf *m_tail; 1963 1964 sc = rxq->vtnrx_sc; 1965 vq = rxq->vtnrx_vq; 1966 m_tail = m_head; 1967 1968 while (--nbufs > 0) { 1969 struct mbuf *m; 1970 uint32_t len; 1971 1972 m = virtqueue_dequeue(vq, &len); 1973 if (m == NULL) { 1974 rxq->vtnrx_stats.vrxs_ierrors++; 1975 goto fail; 1976 } 1977 1978 if (vtnet_rxq_new_buf(rxq) != 0) { 1979 rxq->vtnrx_stats.vrxs_iqdrops++; 1980 vtnet_rxq_discard_buf(rxq, m); 1981 if (nbufs > 1) 1982 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1983 goto fail; 1984 } 1985 1986 if (m->m_len < len) 1987 len = m->m_len; 1988 1989 m->m_len = len; 1990 m->m_flags &= ~M_PKTHDR; 1991 1992 m_head->m_pkthdr.len += len; 1993 m_tail->m_next = m; 1994 m_tail = m; 1995 } 1996 1997 return (0); 1998 1999 fail: 2000 sc->vtnet_stats.rx_mergeable_failed++; 2001 m_freem(m_head); 2002 2003 return (1); 2004 } 2005 2006 #if defined(INET) || defined(INET6) 2007 static int 2008 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 2009 { 2010 struct lro_ctrl *lro; 2011 2012 lro = &rxq->vtnrx_lro; 2013 2014 if (lro->lro_mbuf_max != 0) { 2015 tcp_lro_queue_mbuf(lro, m); 2016 return (0); 2017 } 2018 2019 return (tcp_lro_rx(lro, m, 0)); 2020 } 2021 #endif 2022 2023 static void 2024 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2025 struct virtio_net_hdr *hdr) 2026 { 2027 struct vtnet_softc *sc; 2028 if_t ifp; 2029 2030 sc = rxq->vtnrx_sc; 2031 ifp = sc->vtnet_ifp; 2032 2033 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2034 struct ether_header *eh = mtod(m, struct ether_header *); 2035 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2036 vtnet_vlan_tag_remove(m); 2037 /* 2038 * With the 802.1Q header removed, update the 2039 * checksum starting location accordingly. 2040 */ 2041 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2042 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2043 } 2044 } 2045 2046 m->m_pkthdr.flowid = rxq->vtnrx_id; 2047 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2048 2049 if (hdr->flags & 2050 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2051 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2052 rxq->vtnrx_stats.vrxs_csum++; 2053 else 2054 rxq->vtnrx_stats.vrxs_csum_failed++; 2055 } 2056 2057 if (hdr->gso_size != 0) { 2058 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2059 case VIRTIO_NET_HDR_GSO_TCPV4: 2060 case VIRTIO_NET_HDR_GSO_TCPV6: 2061 m->m_pkthdr.lro_nsegs = 2062 howmany(m->m_pkthdr.len, hdr->gso_size); 2063 rxq->vtnrx_stats.vrxs_host_lro++; 2064 break; 2065 } 2066 } 2067 2068 rxq->vtnrx_stats.vrxs_ipackets++; 2069 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2070 2071 #if defined(INET) || defined(INET6) 2072 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2073 if (vtnet_lro_rx(rxq, m) == 0) 2074 return; 2075 } 2076 #endif 2077 2078 if_input(ifp, m); 2079 } 2080 2081 static int 2082 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2083 { 2084 struct virtio_net_hdr lhdr, *hdr; 2085 struct vtnet_softc *sc; 2086 if_t ifp; 2087 struct virtqueue *vq; 2088 int deq, count; 2089 2090 sc = rxq->vtnrx_sc; 2091 vq = rxq->vtnrx_vq; 2092 ifp = sc->vtnet_ifp; 2093 deq = 0; 2094 count = sc->vtnet_rx_process_limit; 2095 2096 VTNET_RXQ_LOCK_ASSERT(rxq); 2097 2098 CURVNET_SET_QUIET(if_getvnet(ifp)); 2099 while (count-- > 0) { 2100 struct mbuf *m; 2101 uint32_t len, nbufs, adjsz; 2102 2103 m = virtqueue_dequeue(vq, &len); 2104 if (m == NULL) 2105 break; 2106 deq++; 2107 2108 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2109 rxq->vtnrx_stats.vrxs_ierrors++; 2110 vtnet_rxq_discard_buf(rxq, m); 2111 continue; 2112 } 2113 2114 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2115 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2116 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2117 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2118 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2119 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2120 } else if (vtnet_modern(sc)) { 2121 nbufs = 1; /* num_buffers is always 1 */ 2122 adjsz = sizeof(struct virtio_net_hdr_v1); 2123 } else { 2124 nbufs = 1; 2125 adjsz = sizeof(struct vtnet_rx_header); 2126 /* 2127 * Account for our gap between the header and start of 2128 * data to keep the segments separated. 2129 */ 2130 len += VTNET_RX_HEADER_PAD; 2131 } 2132 2133 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2134 rxq->vtnrx_stats.vrxs_iqdrops++; 2135 vtnet_rxq_discard_buf(rxq, m); 2136 if (nbufs > 1) 2137 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2138 continue; 2139 } 2140 2141 m->m_pkthdr.len = len; 2142 m->m_pkthdr.rcvif = ifp; 2143 m->m_pkthdr.csum_flags = 0; 2144 2145 if (nbufs > 1) { 2146 /* Dequeue the rest of chain. */ 2147 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2148 continue; 2149 } 2150 2151 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2152 2153 /* 2154 * Save an endian swapped version of the header prior to it 2155 * being stripped. The header is always at the start of the 2156 * mbuf data. num_buffers was already saved (and not needed) 2157 * so use the standard header. 2158 */ 2159 hdr = mtod(m, struct virtio_net_hdr *); 2160 lhdr.flags = hdr->flags; 2161 lhdr.gso_type = hdr->gso_type; 2162 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2163 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2164 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2165 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2166 m_adj(m, adjsz); 2167 2168 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2169 pfil_return_t pfil; 2170 2171 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2172 switch (pfil) { 2173 case PFIL_DROPPED: 2174 case PFIL_CONSUMED: 2175 continue; 2176 default: 2177 KASSERT(pfil == PFIL_PASS, 2178 ("Filter returned %d!", pfil)); 2179 } 2180 } 2181 2182 vtnet_rxq_input(rxq, m, &lhdr); 2183 } 2184 2185 if (deq > 0) { 2186 #if defined(INET) || defined(INET6) 2187 if (vtnet_software_lro(sc)) 2188 tcp_lro_flush_all(&rxq->vtnrx_lro); 2189 #endif 2190 virtqueue_notify(vq); 2191 } 2192 CURVNET_RESTORE(); 2193 2194 return (count > 0 ? 0 : EAGAIN); 2195 } 2196 2197 static void 2198 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2199 { 2200 struct vtnet_softc *sc; 2201 if_t ifp; 2202 u_int more; 2203 #ifdef DEV_NETMAP 2204 int nmirq; 2205 #endif /* DEV_NETMAP */ 2206 2207 sc = rxq->vtnrx_sc; 2208 ifp = sc->vtnet_ifp; 2209 2210 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2211 /* 2212 * Ignore this interrupt. Either this is a spurious interrupt 2213 * or multiqueue without per-VQ MSIX so every queue needs to 2214 * be polled (a brain dead configuration we could try harder 2215 * to avoid). 2216 */ 2217 vtnet_rxq_disable_intr(rxq); 2218 return; 2219 } 2220 2221 VTNET_RXQ_LOCK(rxq); 2222 2223 #ifdef DEV_NETMAP 2224 /* 2225 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2226 * This is not necessary to serialize the access to the RX vq, but 2227 * rather to avoid races that may happen if this interface is 2228 * attached to a VALE switch, which would cause received packets 2229 * to stall in the RX queue (nm_kr_tryget() could find the kring 2230 * busy when called from netmap_bwrap_intr_notify()). 2231 */ 2232 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2233 if (nmirq != NM_IRQ_PASS) { 2234 VTNET_RXQ_UNLOCK(rxq); 2235 if (nmirq == NM_IRQ_RESCHED) { 2236 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2237 } 2238 return; 2239 } 2240 #endif /* DEV_NETMAP */ 2241 2242 again: 2243 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2244 VTNET_RXQ_UNLOCK(rxq); 2245 return; 2246 } 2247 2248 more = vtnet_rxq_eof(rxq); 2249 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2250 if (!more) 2251 vtnet_rxq_disable_intr(rxq); 2252 /* 2253 * This is an occasional condition or race (when !more), 2254 * so retry a few times before scheduling the taskqueue. 2255 */ 2256 if (tries-- > 0) 2257 goto again; 2258 2259 rxq->vtnrx_stats.vrxs_rescheduled++; 2260 VTNET_RXQ_UNLOCK(rxq); 2261 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2262 } else 2263 VTNET_RXQ_UNLOCK(rxq); 2264 } 2265 2266 static void 2267 vtnet_rx_vq_intr(void *xrxq) 2268 { 2269 struct vtnet_rxq *rxq; 2270 2271 rxq = xrxq; 2272 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2273 } 2274 2275 static void 2276 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2277 { 2278 struct vtnet_rxq *rxq; 2279 2280 rxq = xrxq; 2281 vtnet_rx_vq_process(rxq, 0); 2282 } 2283 2284 static int 2285 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2286 { 2287 struct vtnet_softc *sc; 2288 int threshold; 2289 2290 sc = txq->vtntx_sc; 2291 2292 /* 2293 * The Tx interrupt is disabled until the queue free count falls 2294 * below our threshold. Completed frames are drained from the Tx 2295 * virtqueue before transmitting new frames and in the watchdog 2296 * callout, so the frequency of Tx interrupts is greatly reduced, 2297 * at the cost of not freeing mbufs as quickly as they otherwise 2298 * would be. 2299 */ 2300 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2301 2302 /* 2303 * Without indirect descriptors, leave enough room for the most 2304 * segments we handle. 2305 */ 2306 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2307 threshold < sc->vtnet_tx_nsegs) 2308 threshold = sc->vtnet_tx_nsegs; 2309 2310 return (threshold); 2311 } 2312 2313 static int 2314 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2315 { 2316 struct virtqueue *vq; 2317 2318 vq = txq->vtntx_vq; 2319 2320 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2321 } 2322 2323 static int 2324 vtnet_txq_notify(struct vtnet_txq *txq) 2325 { 2326 struct virtqueue *vq; 2327 2328 vq = txq->vtntx_vq; 2329 2330 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2331 virtqueue_notify(vq); 2332 2333 if (vtnet_txq_enable_intr(txq) == 0) 2334 return (0); 2335 2336 /* 2337 * Drain frames that were completed since last checked. If this 2338 * causes the queue to go above the threshold, the caller should 2339 * continue transmitting. 2340 */ 2341 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2342 virtqueue_disable_intr(vq); 2343 return (1); 2344 } 2345 2346 return (0); 2347 } 2348 2349 static void 2350 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2351 { 2352 struct virtqueue *vq; 2353 struct vtnet_tx_header *txhdr; 2354 int last; 2355 #ifdef DEV_NETMAP 2356 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2357 txq->vtntx_id, NR_TX); 2358 #else /* !DEV_NETMAP */ 2359 void *kring = NULL; 2360 #endif /* !DEV_NETMAP */ 2361 2362 vq = txq->vtntx_vq; 2363 last = 0; 2364 2365 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2366 if (kring == NULL) { 2367 m_freem(txhdr->vth_mbuf); 2368 uma_zfree(vtnet_tx_header_zone, txhdr); 2369 } 2370 } 2371 2372 KASSERT(virtqueue_empty(vq), 2373 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2374 } 2375 2376 /* 2377 * BMV: This can go away once we finally have offsets in the mbuf header. 2378 */ 2379 static int 2380 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2381 int *proto, int *start) 2382 { 2383 struct vtnet_softc *sc; 2384 struct ether_vlan_header *evh; 2385 #if defined(INET) || defined(INET6) 2386 int offset; 2387 #endif 2388 2389 sc = txq->vtntx_sc; 2390 2391 evh = mtod(m, struct ether_vlan_header *); 2392 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2393 /* BMV: We should handle nested VLAN tags too. */ 2394 *etype = ntohs(evh->evl_proto); 2395 #if defined(INET) || defined(INET6) 2396 offset = sizeof(struct ether_vlan_header); 2397 #endif 2398 } else { 2399 *etype = ntohs(evh->evl_encap_proto); 2400 #if defined(INET) || defined(INET6) 2401 offset = sizeof(struct ether_header); 2402 #endif 2403 } 2404 2405 switch (*etype) { 2406 #if defined(INET) 2407 case ETHERTYPE_IP: { 2408 struct ip *ip, iphdr; 2409 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2410 m_copydata(m, offset, sizeof(struct ip), 2411 (caddr_t) &iphdr); 2412 ip = &iphdr; 2413 } else 2414 ip = (struct ip *)(m->m_data + offset); 2415 *proto = ip->ip_p; 2416 *start = offset + (ip->ip_hl << 2); 2417 break; 2418 } 2419 #endif 2420 #if defined(INET6) 2421 case ETHERTYPE_IPV6: 2422 *proto = -1; 2423 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2424 /* Assert the network stack sent us a valid packet. */ 2425 KASSERT(*start > offset, 2426 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2427 *start, offset, *proto)); 2428 break; 2429 #endif 2430 default: 2431 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2432 return (EINVAL); 2433 } 2434 2435 return (0); 2436 } 2437 2438 static int 2439 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2440 int offset, struct virtio_net_hdr *hdr) 2441 { 2442 static struct timeval lastecn; 2443 static int curecn; 2444 struct vtnet_softc *sc; 2445 struct tcphdr *tcp, tcphdr; 2446 2447 sc = txq->vtntx_sc; 2448 2449 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2450 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2451 tcp = &tcphdr; 2452 } else 2453 tcp = (struct tcphdr *)(m->m_data + offset); 2454 2455 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2456 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2457 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2458 VIRTIO_NET_HDR_GSO_TCPV6; 2459 2460 if (__predict_false(tcp->th_flags & TH_CWR)) { 2461 /* 2462 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2463 * FreeBSD, ECN support is not on a per-interface basis, 2464 * but globally via the net.inet.tcp.ecn.enable sysctl 2465 * knob. The default is off. 2466 */ 2467 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2468 if (ppsratecheck(&lastecn, &curecn, 1)) 2469 if_printf(sc->vtnet_ifp, 2470 "TSO with ECN not negotiated with host\n"); 2471 return (ENOTSUP); 2472 } 2473 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2474 } 2475 2476 txq->vtntx_stats.vtxs_tso++; 2477 2478 return (0); 2479 } 2480 2481 static struct mbuf * 2482 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2483 struct virtio_net_hdr *hdr) 2484 { 2485 struct vtnet_softc *sc; 2486 int flags, etype, csum_start, proto, error; 2487 2488 sc = txq->vtntx_sc; 2489 flags = m->m_pkthdr.csum_flags; 2490 2491 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2492 if (error) 2493 goto drop; 2494 2495 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2496 /* Sanity check the parsed mbuf matches the offload flags. */ 2497 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2498 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2499 && etype != ETHERTYPE_IPV6))) { 2500 sc->vtnet_stats.tx_csum_proto_mismatch++; 2501 goto drop; 2502 } 2503 2504 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2505 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2506 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2507 txq->vtntx_stats.vtxs_csum++; 2508 } 2509 2510 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2511 /* 2512 * Sanity check the parsed mbuf IP protocol is TCP, and 2513 * VirtIO TSO reqires the checksum offloading above. 2514 */ 2515 if (__predict_false(proto != IPPROTO_TCP)) { 2516 sc->vtnet_stats.tx_tso_not_tcp++; 2517 goto drop; 2518 } else if (__predict_false((hdr->flags & 2519 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2520 sc->vtnet_stats.tx_tso_without_csum++; 2521 goto drop; 2522 } 2523 2524 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2525 if (error) 2526 goto drop; 2527 } 2528 2529 return (m); 2530 2531 drop: 2532 m_freem(m); 2533 return (NULL); 2534 } 2535 2536 static int 2537 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2538 struct vtnet_tx_header *txhdr) 2539 { 2540 struct vtnet_softc *sc; 2541 struct virtqueue *vq; 2542 struct sglist *sg; 2543 struct mbuf *m; 2544 int error; 2545 2546 sc = txq->vtntx_sc; 2547 vq = txq->vtntx_vq; 2548 sg = txq->vtntx_sg; 2549 m = *m_head; 2550 2551 sglist_reset(sg); 2552 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2553 if (error != 0 || sg->sg_nseg != 1) { 2554 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2555 __func__, error, sg->sg_nseg)); 2556 goto fail; 2557 } 2558 2559 error = sglist_append_mbuf(sg, m); 2560 if (error) { 2561 m = m_defrag(m, M_NOWAIT); 2562 if (m == NULL) 2563 goto fail; 2564 2565 *m_head = m; 2566 sc->vtnet_stats.tx_defragged++; 2567 2568 error = sglist_append_mbuf(sg, m); 2569 if (error) 2570 goto fail; 2571 } 2572 2573 txhdr->vth_mbuf = m; 2574 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2575 2576 return (error); 2577 2578 fail: 2579 sc->vtnet_stats.tx_defrag_failed++; 2580 m_freem(*m_head); 2581 *m_head = NULL; 2582 2583 return (ENOBUFS); 2584 } 2585 2586 static int 2587 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2588 { 2589 struct vtnet_tx_header *txhdr; 2590 struct virtio_net_hdr *hdr; 2591 struct mbuf *m; 2592 int error; 2593 2594 m = *m_head; 2595 M_ASSERTPKTHDR(m); 2596 2597 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2598 if (txhdr == NULL) { 2599 m_freem(m); 2600 *m_head = NULL; 2601 return (ENOMEM); 2602 } 2603 2604 /* 2605 * Always use the non-mergeable header, regardless if mergable headers 2606 * were negotiated, because for transmit num_buffers is always zero. 2607 * The vtnet_hdr_size is used to enqueue the right header size segment. 2608 */ 2609 hdr = &txhdr->vth_uhdr.hdr; 2610 2611 if (m->m_flags & M_VLANTAG) { 2612 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2613 if ((*m_head = m) == NULL) { 2614 error = ENOBUFS; 2615 goto fail; 2616 } 2617 m->m_flags &= ~M_VLANTAG; 2618 } 2619 2620 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) { 2621 m = vtnet_txq_offload(txq, m, hdr); 2622 if ((*m_head = m) == NULL) { 2623 error = ENOBUFS; 2624 goto fail; 2625 } 2626 } 2627 2628 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2629 fail: 2630 if (error) 2631 uma_zfree(vtnet_tx_header_zone, txhdr); 2632 2633 return (error); 2634 } 2635 2636 #ifdef VTNET_LEGACY_TX 2637 2638 static void 2639 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2640 { 2641 struct vtnet_softc *sc; 2642 struct virtqueue *vq; 2643 struct mbuf *m0; 2644 int tries, enq; 2645 2646 sc = txq->vtntx_sc; 2647 vq = txq->vtntx_vq; 2648 tries = 0; 2649 2650 VTNET_TXQ_LOCK_ASSERT(txq); 2651 2652 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2653 sc->vtnet_link_active == 0) 2654 return; 2655 2656 vtnet_txq_eof(txq); 2657 2658 again: 2659 enq = 0; 2660 2661 while (!if_sendq_empty(ifp)) { 2662 if (virtqueue_full(vq)) 2663 break; 2664 2665 m0 = if_dequeue(ifp); 2666 if (m0 == NULL) 2667 break; 2668 2669 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2670 if (m0 != NULL) 2671 if_sendq_prepend(ifp, m0); 2672 break; 2673 } 2674 2675 enq++; 2676 ETHER_BPF_MTAP(ifp, m0); 2677 } 2678 2679 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2680 if (tries++ < VTNET_NOTIFY_RETRIES) 2681 goto again; 2682 2683 txq->vtntx_stats.vtxs_rescheduled++; 2684 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2685 } 2686 } 2687 2688 static void 2689 vtnet_start(if_t ifp) 2690 { 2691 struct vtnet_softc *sc; 2692 struct vtnet_txq *txq; 2693 2694 sc = if_getsoftc(ifp); 2695 txq = &sc->vtnet_txqs[0]; 2696 2697 VTNET_TXQ_LOCK(txq); 2698 vtnet_start_locked(txq, ifp); 2699 VTNET_TXQ_UNLOCK(txq); 2700 } 2701 2702 #else /* !VTNET_LEGACY_TX */ 2703 2704 static int 2705 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2706 { 2707 struct vtnet_softc *sc; 2708 struct virtqueue *vq; 2709 struct buf_ring *br; 2710 if_t ifp; 2711 int enq, tries, error; 2712 2713 sc = txq->vtntx_sc; 2714 vq = txq->vtntx_vq; 2715 br = txq->vtntx_br; 2716 ifp = sc->vtnet_ifp; 2717 tries = 0; 2718 error = 0; 2719 2720 VTNET_TXQ_LOCK_ASSERT(txq); 2721 2722 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2723 sc->vtnet_link_active == 0) { 2724 if (m != NULL) 2725 error = drbr_enqueue(ifp, br, m); 2726 return (error); 2727 } 2728 2729 if (m != NULL) { 2730 error = drbr_enqueue(ifp, br, m); 2731 if (error) 2732 return (error); 2733 } 2734 2735 vtnet_txq_eof(txq); 2736 2737 again: 2738 enq = 0; 2739 2740 while ((m = drbr_peek(ifp, br)) != NULL) { 2741 if (virtqueue_full(vq)) { 2742 drbr_putback(ifp, br, m); 2743 break; 2744 } 2745 2746 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2747 if (m != NULL) 2748 drbr_putback(ifp, br, m); 2749 else 2750 drbr_advance(ifp, br); 2751 break; 2752 } 2753 drbr_advance(ifp, br); 2754 2755 enq++; 2756 ETHER_BPF_MTAP(ifp, m); 2757 } 2758 2759 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2760 if (tries++ < VTNET_NOTIFY_RETRIES) 2761 goto again; 2762 2763 txq->vtntx_stats.vtxs_rescheduled++; 2764 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2765 } 2766 2767 return (0); 2768 } 2769 2770 static int 2771 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2772 { 2773 struct vtnet_softc *sc; 2774 struct vtnet_txq *txq; 2775 int i, npairs, error; 2776 2777 sc = if_getsoftc(ifp); 2778 npairs = sc->vtnet_act_vq_pairs; 2779 2780 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2781 i = m->m_pkthdr.flowid % npairs; 2782 else 2783 i = curcpu % npairs; 2784 2785 txq = &sc->vtnet_txqs[i]; 2786 2787 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2788 error = vtnet_txq_mq_start_locked(txq, m); 2789 VTNET_TXQ_UNLOCK(txq); 2790 } else { 2791 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2792 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2793 } 2794 2795 return (error); 2796 } 2797 2798 static void 2799 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2800 { 2801 struct vtnet_softc *sc; 2802 struct vtnet_txq *txq; 2803 2804 txq = xtxq; 2805 sc = txq->vtntx_sc; 2806 2807 VTNET_TXQ_LOCK(txq); 2808 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2809 vtnet_txq_mq_start_locked(txq, NULL); 2810 VTNET_TXQ_UNLOCK(txq); 2811 } 2812 2813 #endif /* VTNET_LEGACY_TX */ 2814 2815 static void 2816 vtnet_txq_start(struct vtnet_txq *txq) 2817 { 2818 struct vtnet_softc *sc; 2819 if_t ifp; 2820 2821 sc = txq->vtntx_sc; 2822 ifp = sc->vtnet_ifp; 2823 2824 #ifdef VTNET_LEGACY_TX 2825 if (!if_sendq_empty(ifp)) 2826 vtnet_start_locked(txq, ifp); 2827 #else 2828 if (!drbr_empty(ifp, txq->vtntx_br)) 2829 vtnet_txq_mq_start_locked(txq, NULL); 2830 #endif 2831 } 2832 2833 static void 2834 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2835 { 2836 struct vtnet_softc *sc; 2837 struct vtnet_txq *txq; 2838 if_t ifp; 2839 2840 txq = xtxq; 2841 sc = txq->vtntx_sc; 2842 ifp = sc->vtnet_ifp; 2843 2844 VTNET_TXQ_LOCK(txq); 2845 2846 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2847 VTNET_TXQ_UNLOCK(txq); 2848 return; 2849 } 2850 2851 vtnet_txq_eof(txq); 2852 vtnet_txq_start(txq); 2853 2854 VTNET_TXQ_UNLOCK(txq); 2855 } 2856 2857 static int 2858 vtnet_txq_eof(struct vtnet_txq *txq) 2859 { 2860 struct virtqueue *vq; 2861 struct vtnet_tx_header *txhdr; 2862 struct mbuf *m; 2863 int deq; 2864 2865 vq = txq->vtntx_vq; 2866 deq = 0; 2867 VTNET_TXQ_LOCK_ASSERT(txq); 2868 2869 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2870 m = txhdr->vth_mbuf; 2871 deq++; 2872 2873 txq->vtntx_stats.vtxs_opackets++; 2874 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2875 if (m->m_flags & M_MCAST) 2876 txq->vtntx_stats.vtxs_omcasts++; 2877 2878 m_freem(m); 2879 uma_zfree(vtnet_tx_header_zone, txhdr); 2880 } 2881 2882 if (virtqueue_empty(vq)) 2883 txq->vtntx_watchdog = 0; 2884 2885 return (deq); 2886 } 2887 2888 static void 2889 vtnet_tx_vq_intr(void *xtxq) 2890 { 2891 struct vtnet_softc *sc; 2892 struct vtnet_txq *txq; 2893 if_t ifp; 2894 2895 txq = xtxq; 2896 sc = txq->vtntx_sc; 2897 ifp = sc->vtnet_ifp; 2898 2899 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2900 /* 2901 * Ignore this interrupt. Either this is a spurious interrupt 2902 * or multiqueue without per-VQ MSIX so every queue needs to 2903 * be polled (a brain dead configuration we could try harder 2904 * to avoid). 2905 */ 2906 vtnet_txq_disable_intr(txq); 2907 return; 2908 } 2909 2910 #ifdef DEV_NETMAP 2911 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2912 return; 2913 #endif /* DEV_NETMAP */ 2914 2915 VTNET_TXQ_LOCK(txq); 2916 2917 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2918 VTNET_TXQ_UNLOCK(txq); 2919 return; 2920 } 2921 2922 vtnet_txq_eof(txq); 2923 vtnet_txq_start(txq); 2924 2925 VTNET_TXQ_UNLOCK(txq); 2926 } 2927 2928 static void 2929 vtnet_tx_start_all(struct vtnet_softc *sc) 2930 { 2931 struct vtnet_txq *txq; 2932 int i; 2933 2934 VTNET_CORE_LOCK_ASSERT(sc); 2935 2936 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2937 txq = &sc->vtnet_txqs[i]; 2938 2939 VTNET_TXQ_LOCK(txq); 2940 vtnet_txq_start(txq); 2941 VTNET_TXQ_UNLOCK(txq); 2942 } 2943 } 2944 2945 #ifndef VTNET_LEGACY_TX 2946 static void 2947 vtnet_qflush(if_t ifp) 2948 { 2949 struct vtnet_softc *sc; 2950 struct vtnet_txq *txq; 2951 struct mbuf *m; 2952 int i; 2953 2954 sc = if_getsoftc(ifp); 2955 2956 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2957 txq = &sc->vtnet_txqs[i]; 2958 2959 VTNET_TXQ_LOCK(txq); 2960 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2961 m_freem(m); 2962 VTNET_TXQ_UNLOCK(txq); 2963 } 2964 2965 if_qflush(ifp); 2966 } 2967 #endif 2968 2969 static int 2970 vtnet_watchdog(struct vtnet_txq *txq) 2971 { 2972 if_t ifp; 2973 2974 ifp = txq->vtntx_sc->vtnet_ifp; 2975 2976 VTNET_TXQ_LOCK(txq); 2977 if (txq->vtntx_watchdog == 1) { 2978 /* 2979 * Only drain completed frames if the watchdog is about to 2980 * expire. If any frames were drained, there may be enough 2981 * free descriptors now available to transmit queued frames. 2982 * In that case, the timer will immediately be decremented 2983 * below, but the timeout is generous enough that should not 2984 * be a problem. 2985 */ 2986 if (vtnet_txq_eof(txq) != 0) 2987 vtnet_txq_start(txq); 2988 } 2989 2990 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2991 VTNET_TXQ_UNLOCK(txq); 2992 return (0); 2993 } 2994 VTNET_TXQ_UNLOCK(txq); 2995 2996 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2997 return (1); 2998 } 2999 3000 static void 3001 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 3002 struct vtnet_txq_stats *txacc) 3003 { 3004 3005 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 3006 bzero(txacc, sizeof(struct vtnet_txq_stats)); 3007 3008 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3009 struct vtnet_rxq_stats *rxst; 3010 struct vtnet_txq_stats *txst; 3011 3012 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 3013 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 3014 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 3015 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 3016 rxacc->vrxs_csum += rxst->vrxs_csum; 3017 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 3018 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 3019 3020 txst = &sc->vtnet_txqs[i].vtntx_stats; 3021 txacc->vtxs_opackets += txst->vtxs_opackets; 3022 txacc->vtxs_obytes += txst->vtxs_obytes; 3023 txacc->vtxs_csum += txst->vtxs_csum; 3024 txacc->vtxs_tso += txst->vtxs_tso; 3025 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 3026 } 3027 } 3028 3029 static uint64_t 3030 vtnet_get_counter(if_t ifp, ift_counter cnt) 3031 { 3032 struct vtnet_softc *sc; 3033 struct vtnet_rxq_stats rxaccum; 3034 struct vtnet_txq_stats txaccum; 3035 3036 sc = if_getsoftc(ifp); 3037 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3038 3039 switch (cnt) { 3040 case IFCOUNTER_IPACKETS: 3041 return (rxaccum.vrxs_ipackets); 3042 case IFCOUNTER_IQDROPS: 3043 return (rxaccum.vrxs_iqdrops); 3044 case IFCOUNTER_IERRORS: 3045 return (rxaccum.vrxs_ierrors); 3046 case IFCOUNTER_OPACKETS: 3047 return (txaccum.vtxs_opackets); 3048 #ifndef VTNET_LEGACY_TX 3049 case IFCOUNTER_OBYTES: 3050 return (txaccum.vtxs_obytes); 3051 case IFCOUNTER_OMCASTS: 3052 return (txaccum.vtxs_omcasts); 3053 #endif 3054 default: 3055 return (if_get_counter_default(ifp, cnt)); 3056 } 3057 } 3058 3059 static void 3060 vtnet_tick(void *xsc) 3061 { 3062 struct vtnet_softc *sc; 3063 if_t ifp; 3064 int i, timedout; 3065 3066 sc = xsc; 3067 ifp = sc->vtnet_ifp; 3068 timedout = 0; 3069 3070 VTNET_CORE_LOCK_ASSERT(sc); 3071 3072 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3073 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3074 3075 if (timedout != 0) { 3076 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3077 vtnet_init_locked(sc, 0); 3078 } else 3079 callout_schedule(&sc->vtnet_tick_ch, hz); 3080 } 3081 3082 static void 3083 vtnet_start_taskqueues(struct vtnet_softc *sc) 3084 { 3085 device_t dev; 3086 struct vtnet_rxq *rxq; 3087 struct vtnet_txq *txq; 3088 int i, error; 3089 3090 dev = sc->vtnet_dev; 3091 3092 /* 3093 * Errors here are very difficult to recover from - we cannot 3094 * easily fail because, if this is during boot, we will hang 3095 * when freeing any successfully started taskqueues because 3096 * the scheduler isn't up yet. 3097 * 3098 * Most drivers just ignore the return value - it only fails 3099 * with ENOMEM so an error is not likely. 3100 */ 3101 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3102 rxq = &sc->vtnet_rxqs[i]; 3103 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3104 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3105 if (error) { 3106 device_printf(dev, "failed to start rx taskq %d\n", 3107 rxq->vtnrx_id); 3108 } 3109 3110 txq = &sc->vtnet_txqs[i]; 3111 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3112 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3113 if (error) { 3114 device_printf(dev, "failed to start tx taskq %d\n", 3115 txq->vtntx_id); 3116 } 3117 } 3118 } 3119 3120 static void 3121 vtnet_free_taskqueues(struct vtnet_softc *sc) 3122 { 3123 struct vtnet_rxq *rxq; 3124 struct vtnet_txq *txq; 3125 int i; 3126 3127 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3128 rxq = &sc->vtnet_rxqs[i]; 3129 if (rxq->vtnrx_tq != NULL) { 3130 taskqueue_free(rxq->vtnrx_tq); 3131 rxq->vtnrx_tq = NULL; 3132 } 3133 3134 txq = &sc->vtnet_txqs[i]; 3135 if (txq->vtntx_tq != NULL) { 3136 taskqueue_free(txq->vtntx_tq); 3137 txq->vtntx_tq = NULL; 3138 } 3139 } 3140 } 3141 3142 static void 3143 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3144 { 3145 struct vtnet_rxq *rxq; 3146 struct vtnet_txq *txq; 3147 int i; 3148 3149 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3150 rxq = &sc->vtnet_rxqs[i]; 3151 if (rxq->vtnrx_tq != NULL) 3152 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3153 3154 txq = &sc->vtnet_txqs[i]; 3155 if (txq->vtntx_tq != NULL) { 3156 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3157 #ifndef VTNET_LEGACY_TX 3158 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3159 #endif 3160 } 3161 } 3162 } 3163 3164 static void 3165 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3166 { 3167 struct vtnet_rxq *rxq; 3168 struct vtnet_txq *txq; 3169 int i; 3170 3171 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3172 rxq = &sc->vtnet_rxqs[i]; 3173 vtnet_rxq_free_mbufs(rxq); 3174 3175 txq = &sc->vtnet_txqs[i]; 3176 vtnet_txq_free_mbufs(txq); 3177 } 3178 } 3179 3180 static void 3181 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3182 { 3183 struct vtnet_rxq *rxq; 3184 struct vtnet_txq *txq; 3185 int i; 3186 3187 VTNET_CORE_LOCK_ASSERT(sc); 3188 3189 /* 3190 * Lock and unlock the per-queue mutex so we known the stop 3191 * state is visible. Doing only the active queues should be 3192 * sufficient, but it does not cost much extra to do all the 3193 * queues. 3194 */ 3195 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3196 rxq = &sc->vtnet_rxqs[i]; 3197 VTNET_RXQ_LOCK(rxq); 3198 VTNET_RXQ_UNLOCK(rxq); 3199 3200 txq = &sc->vtnet_txqs[i]; 3201 VTNET_TXQ_LOCK(txq); 3202 VTNET_TXQ_UNLOCK(txq); 3203 } 3204 } 3205 3206 static void 3207 vtnet_stop(struct vtnet_softc *sc) 3208 { 3209 device_t dev; 3210 if_t ifp; 3211 3212 dev = sc->vtnet_dev; 3213 ifp = sc->vtnet_ifp; 3214 3215 VTNET_CORE_LOCK_ASSERT(sc); 3216 3217 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3218 sc->vtnet_link_active = 0; 3219 callout_stop(&sc->vtnet_tick_ch); 3220 3221 /* Only advisory. */ 3222 vtnet_disable_interrupts(sc); 3223 3224 #ifdef DEV_NETMAP 3225 /* Stop any pending txsync/rxsync and disable them. */ 3226 netmap_disable_all_rings(ifp); 3227 #endif /* DEV_NETMAP */ 3228 3229 /* 3230 * Stop the host adapter. This resets it to the pre-initialized 3231 * state. It will not generate any interrupts until after it is 3232 * reinitialized. 3233 */ 3234 virtio_stop(dev); 3235 vtnet_stop_rendezvous(sc); 3236 3237 vtnet_drain_rxtx_queues(sc); 3238 sc->vtnet_act_vq_pairs = 1; 3239 } 3240 3241 static int 3242 vtnet_virtio_reinit(struct vtnet_softc *sc) 3243 { 3244 device_t dev; 3245 if_t ifp; 3246 uint64_t features; 3247 int error; 3248 3249 dev = sc->vtnet_dev; 3250 ifp = sc->vtnet_ifp; 3251 features = sc->vtnet_negotiated_features; 3252 3253 /* 3254 * Re-negotiate with the host, removing any disabled receive 3255 * features. Transmit features are disabled only on our side 3256 * via if_capenable and if_hwassist. 3257 */ 3258 3259 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3260 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3261 3262 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3263 features &= ~VTNET_LRO_FEATURES; 3264 3265 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3266 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3267 3268 error = virtio_reinit(dev, features); 3269 if (error) { 3270 device_printf(dev, "virtio reinit error %d\n", error); 3271 return (error); 3272 } 3273 3274 sc->vtnet_features = features; 3275 virtio_reinit_complete(dev); 3276 3277 return (0); 3278 } 3279 3280 static void 3281 vtnet_init_rx_filters(struct vtnet_softc *sc) 3282 { 3283 if_t ifp; 3284 3285 ifp = sc->vtnet_ifp; 3286 3287 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3288 vtnet_rx_filter(sc); 3289 vtnet_rx_filter_mac(sc); 3290 } 3291 3292 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3293 vtnet_rx_filter_vlan(sc); 3294 } 3295 3296 static int 3297 vtnet_init_rx_queues(struct vtnet_softc *sc) 3298 { 3299 device_t dev; 3300 if_t ifp; 3301 struct vtnet_rxq *rxq; 3302 int i, clustersz, error; 3303 3304 dev = sc->vtnet_dev; 3305 ifp = sc->vtnet_ifp; 3306 3307 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3308 sc->vtnet_rx_clustersz = clustersz; 3309 3310 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3311 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3312 VTNET_MAX_RX_SIZE, clustersz); 3313 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3314 ("%s: too many rx mbufs %d for %d segments", __func__, 3315 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3316 } else 3317 sc->vtnet_rx_nmbufs = 1; 3318 3319 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3320 rxq = &sc->vtnet_rxqs[i]; 3321 3322 /* Hold the lock to satisfy asserts. */ 3323 VTNET_RXQ_LOCK(rxq); 3324 error = vtnet_rxq_populate(rxq); 3325 VTNET_RXQ_UNLOCK(rxq); 3326 3327 if (error) { 3328 device_printf(dev, "cannot populate Rx queue %d\n", i); 3329 return (error); 3330 } 3331 } 3332 3333 return (0); 3334 } 3335 3336 static int 3337 vtnet_init_tx_queues(struct vtnet_softc *sc) 3338 { 3339 struct vtnet_txq *txq; 3340 int i; 3341 3342 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3343 txq = &sc->vtnet_txqs[i]; 3344 txq->vtntx_watchdog = 0; 3345 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3346 #ifdef DEV_NETMAP 3347 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3348 #endif /* DEV_NETMAP */ 3349 } 3350 3351 return (0); 3352 } 3353 3354 static int 3355 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3356 { 3357 int error; 3358 3359 error = vtnet_init_rx_queues(sc); 3360 if (error) 3361 return (error); 3362 3363 error = vtnet_init_tx_queues(sc); 3364 if (error) 3365 return (error); 3366 3367 return (0); 3368 } 3369 3370 static void 3371 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3372 { 3373 device_t dev; 3374 int npairs; 3375 3376 dev = sc->vtnet_dev; 3377 3378 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3379 sc->vtnet_act_vq_pairs = 1; 3380 return; 3381 } 3382 3383 npairs = sc->vtnet_req_vq_pairs; 3384 3385 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3386 device_printf(dev, "cannot set active queue pairs to %d, " 3387 "falling back to 1 queue pair\n", npairs); 3388 npairs = 1; 3389 } 3390 3391 sc->vtnet_act_vq_pairs = npairs; 3392 } 3393 3394 static void 3395 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3396 { 3397 if_t ifp; 3398 uint64_t features; 3399 int error; 3400 3401 ifp = sc->vtnet_ifp; 3402 features = sc->vtnet_features; 3403 3404 VTNET_CORE_LOCK_ASSERT(sc); 3405 3406 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3407 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3408 features |= VIRTIO_NET_F_GUEST_CSUM; 3409 else 3410 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3411 } 3412 3413 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3414 if (if_getcapenable(ifp) & IFCAP_LRO) 3415 features |= VTNET_LRO_FEATURES; 3416 else 3417 features &= ~VTNET_LRO_FEATURES; 3418 } 3419 3420 error = vtnet_ctrl_guest_offloads(sc, 3421 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3422 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3423 VIRTIO_NET_F_GUEST_UFO)); 3424 if (error) { 3425 device_printf(sc->vtnet_dev, 3426 "%s: cannot update Rx features\n", __func__); 3427 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3428 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3429 vtnet_init_locked(sc, 0); 3430 } 3431 } else 3432 sc->vtnet_features = features; 3433 } 3434 3435 static int 3436 vtnet_reinit(struct vtnet_softc *sc) 3437 { 3438 if_t ifp; 3439 int error; 3440 3441 ifp = sc->vtnet_ifp; 3442 3443 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3444 3445 error = vtnet_virtio_reinit(sc); 3446 if (error) 3447 return (error); 3448 3449 vtnet_set_macaddr(sc); 3450 vtnet_set_active_vq_pairs(sc); 3451 3452 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3453 vtnet_init_rx_filters(sc); 3454 3455 if_sethwassist(ifp, 0); 3456 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3457 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3458 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3459 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3460 if (if_getcapenable(ifp) & IFCAP_TSO4) 3461 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3462 if (if_getcapenable(ifp) & IFCAP_TSO6) 3463 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3464 3465 error = vtnet_init_rxtx_queues(sc); 3466 if (error) 3467 return (error); 3468 3469 return (0); 3470 } 3471 3472 static void 3473 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3474 { 3475 if_t ifp; 3476 3477 ifp = sc->vtnet_ifp; 3478 3479 VTNET_CORE_LOCK_ASSERT(sc); 3480 3481 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3482 return; 3483 3484 vtnet_stop(sc); 3485 3486 #ifdef DEV_NETMAP 3487 /* Once stopped we can update the netmap flags, if necessary. */ 3488 switch (init_mode) { 3489 case VTNET_INIT_NETMAP_ENTER: 3490 nm_set_native_flags(NA(ifp)); 3491 break; 3492 case VTNET_INIT_NETMAP_EXIT: 3493 nm_clear_native_flags(NA(ifp)); 3494 break; 3495 } 3496 #endif /* DEV_NETMAP */ 3497 3498 if (vtnet_reinit(sc) != 0) { 3499 vtnet_stop(sc); 3500 return; 3501 } 3502 3503 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3504 vtnet_update_link_status(sc); 3505 vtnet_enable_interrupts(sc); 3506 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3507 3508 #ifdef DEV_NETMAP 3509 /* Re-enable txsync/rxsync. */ 3510 netmap_enable_all_rings(ifp); 3511 #endif /* DEV_NETMAP */ 3512 } 3513 3514 static void 3515 vtnet_init(void *xsc) 3516 { 3517 struct vtnet_softc *sc; 3518 3519 sc = xsc; 3520 3521 VTNET_CORE_LOCK(sc); 3522 vtnet_init_locked(sc, 0); 3523 VTNET_CORE_UNLOCK(sc); 3524 } 3525 3526 static void 3527 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3528 { 3529 3530 /* 3531 * The control virtqueue is only polled and therefore it should 3532 * already be empty. 3533 */ 3534 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3535 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3536 } 3537 3538 static void 3539 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3540 struct sglist *sg, int readable, int writable) 3541 { 3542 struct virtqueue *vq; 3543 3544 vq = sc->vtnet_ctrl_vq; 3545 3546 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3547 VTNET_CORE_LOCK_ASSERT(sc); 3548 3549 if (!virtqueue_empty(vq)) 3550 return; 3551 3552 /* 3553 * Poll for the response, but the command is likely completed before 3554 * returning from the notify. 3555 */ 3556 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3557 virtqueue_notify(vq); 3558 virtqueue_poll(vq, NULL); 3559 } 3560 } 3561 3562 static int 3563 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3564 { 3565 struct sglist_seg segs[3]; 3566 struct sglist sg; 3567 struct { 3568 struct virtio_net_ctrl_hdr hdr __aligned(2); 3569 uint8_t pad1; 3570 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3571 uint8_t pad2; 3572 uint8_t ack; 3573 } s; 3574 int error; 3575 3576 error = 0; 3577 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3578 3579 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3580 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3581 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3582 s.ack = VIRTIO_NET_ERR; 3583 3584 sglist_init(&sg, nitems(segs), segs); 3585 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3586 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3587 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3588 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3589 3590 if (error == 0) 3591 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3592 3593 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3594 } 3595 3596 static int 3597 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3598 { 3599 struct sglist_seg segs[3]; 3600 struct sglist sg; 3601 struct { 3602 struct virtio_net_ctrl_hdr hdr __aligned(2); 3603 uint8_t pad1; 3604 uint64_t offloads __aligned(8); 3605 uint8_t pad2; 3606 uint8_t ack; 3607 } s; 3608 int error; 3609 3610 error = 0; 3611 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3612 3613 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3614 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3615 s.offloads = vtnet_gtoh64(sc, offloads); 3616 s.ack = VIRTIO_NET_ERR; 3617 3618 sglist_init(&sg, nitems(segs), segs); 3619 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3620 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3621 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3622 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3623 3624 if (error == 0) 3625 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3626 3627 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3628 } 3629 3630 static int 3631 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3632 { 3633 struct sglist_seg segs[3]; 3634 struct sglist sg; 3635 struct { 3636 struct virtio_net_ctrl_hdr hdr __aligned(2); 3637 uint8_t pad1; 3638 struct virtio_net_ctrl_mq mq __aligned(2); 3639 uint8_t pad2; 3640 uint8_t ack; 3641 } s; 3642 int error; 3643 3644 error = 0; 3645 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3646 3647 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3648 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3649 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3650 s.ack = VIRTIO_NET_ERR; 3651 3652 sglist_init(&sg, nitems(segs), segs); 3653 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3654 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3655 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3656 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3657 3658 if (error == 0) 3659 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3660 3661 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3662 } 3663 3664 static int 3665 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3666 { 3667 struct sglist_seg segs[3]; 3668 struct sglist sg; 3669 struct { 3670 struct virtio_net_ctrl_hdr hdr __aligned(2); 3671 uint8_t pad1; 3672 uint8_t onoff; 3673 uint8_t pad2; 3674 uint8_t ack; 3675 } s; 3676 int error; 3677 3678 error = 0; 3679 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3680 3681 s.hdr.class = VIRTIO_NET_CTRL_RX; 3682 s.hdr.cmd = cmd; 3683 s.onoff = on; 3684 s.ack = VIRTIO_NET_ERR; 3685 3686 sglist_init(&sg, nitems(segs), segs); 3687 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3688 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3689 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3690 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3691 3692 if (error == 0) 3693 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3694 3695 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3696 } 3697 3698 static int 3699 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3700 { 3701 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3702 } 3703 3704 static int 3705 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3706 { 3707 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3708 } 3709 3710 static void 3711 vtnet_rx_filter(struct vtnet_softc *sc) 3712 { 3713 device_t dev; 3714 if_t ifp; 3715 3716 dev = sc->vtnet_dev; 3717 ifp = sc->vtnet_ifp; 3718 3719 VTNET_CORE_LOCK_ASSERT(sc); 3720 3721 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3722 device_printf(dev, "cannot %s promiscuous mode\n", 3723 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3724 } 3725 3726 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3727 device_printf(dev, "cannot %s all-multicast mode\n", 3728 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3729 } 3730 } 3731 3732 static u_int 3733 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3734 { 3735 struct vtnet_softc *sc = arg; 3736 3737 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3738 return (0); 3739 3740 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3741 bcopy(LLADDR(sdl), 3742 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3743 ETHER_ADDR_LEN); 3744 3745 return (1); 3746 } 3747 3748 static u_int 3749 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3750 { 3751 struct vtnet_mac_filter *filter = arg; 3752 3753 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3754 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3755 ETHER_ADDR_LEN); 3756 3757 return (1); 3758 } 3759 3760 static void 3761 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3762 { 3763 struct virtio_net_ctrl_hdr hdr __aligned(2); 3764 struct vtnet_mac_filter *filter; 3765 struct sglist_seg segs[4]; 3766 struct sglist sg; 3767 if_t ifp; 3768 bool promisc, allmulti; 3769 u_int ucnt, mcnt; 3770 int error; 3771 uint8_t ack; 3772 3773 ifp = sc->vtnet_ifp; 3774 filter = sc->vtnet_mac_filter; 3775 error = 0; 3776 3777 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3778 VTNET_CORE_LOCK_ASSERT(sc); 3779 3780 /* Unicast MAC addresses: */ 3781 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3782 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3783 3784 if (promisc) { 3785 ucnt = 0; 3786 if_printf(ifp, "more than %d MAC addresses assigned, " 3787 "falling back to promiscuous mode\n", 3788 VTNET_MAX_MAC_ENTRIES); 3789 } 3790 3791 /* Multicast MAC addresses: */ 3792 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3793 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3794 3795 if (allmulti) { 3796 mcnt = 0; 3797 if_printf(ifp, "more than %d multicast MAC addresses " 3798 "assigned, falling back to all-multicast mode\n", 3799 VTNET_MAX_MAC_ENTRIES); 3800 } 3801 3802 if (promisc && allmulti) 3803 goto out; 3804 3805 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3806 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3807 3808 hdr.class = VIRTIO_NET_CTRL_MAC; 3809 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3810 ack = VIRTIO_NET_ERR; 3811 3812 sglist_init(&sg, nitems(segs), segs); 3813 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3814 error |= sglist_append(&sg, &filter->vmf_unicast, 3815 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3816 error |= sglist_append(&sg, &filter->vmf_multicast, 3817 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3818 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3819 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3820 3821 if (error == 0) 3822 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3823 if (ack != VIRTIO_NET_OK) 3824 if_printf(ifp, "error setting host MAC filter table\n"); 3825 3826 out: 3827 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0) 3828 if_printf(ifp, "cannot enable promiscuous mode\n"); 3829 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0) 3830 if_printf(ifp, "cannot enable all-multicast mode\n"); 3831 } 3832 3833 static int 3834 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3835 { 3836 struct sglist_seg segs[3]; 3837 struct sglist sg; 3838 struct { 3839 struct virtio_net_ctrl_hdr hdr __aligned(2); 3840 uint8_t pad1; 3841 uint16_t tag __aligned(2); 3842 uint8_t pad2; 3843 uint8_t ack; 3844 } s; 3845 int error; 3846 3847 error = 0; 3848 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3849 3850 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3851 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3852 s.tag = vtnet_gtoh16(sc, tag); 3853 s.ack = VIRTIO_NET_ERR; 3854 3855 sglist_init(&sg, nitems(segs), segs); 3856 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3857 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3858 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3859 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3860 3861 if (error == 0) 3862 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3863 3864 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3865 } 3866 3867 static void 3868 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3869 { 3870 int i, bit; 3871 uint32_t w; 3872 uint16_t tag; 3873 3874 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3875 VTNET_CORE_LOCK_ASSERT(sc); 3876 3877 /* Enable the filter for each configured VLAN. */ 3878 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3879 w = sc->vtnet_vlan_filter[i]; 3880 3881 while ((bit = ffs(w) - 1) != -1) { 3882 w &= ~(1 << bit); 3883 tag = sizeof(w) * CHAR_BIT * i + bit; 3884 3885 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3886 device_printf(sc->vtnet_dev, 3887 "cannot enable VLAN %d filter\n", tag); 3888 } 3889 } 3890 } 3891 } 3892 3893 static void 3894 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3895 { 3896 if_t ifp; 3897 int idx, bit; 3898 3899 ifp = sc->vtnet_ifp; 3900 idx = (tag >> 5) & 0x7F; 3901 bit = tag & 0x1F; 3902 3903 if (tag == 0 || tag > 4095) 3904 return; 3905 3906 VTNET_CORE_LOCK(sc); 3907 3908 if (add) 3909 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3910 else 3911 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3912 3913 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3914 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3915 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3916 device_printf(sc->vtnet_dev, 3917 "cannot %s VLAN %d %s the host filter table\n", 3918 add ? "add" : "remove", tag, add ? "to" : "from"); 3919 } 3920 3921 VTNET_CORE_UNLOCK(sc); 3922 } 3923 3924 static void 3925 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3926 { 3927 3928 if (if_getsoftc(ifp) != arg) 3929 return; 3930 3931 vtnet_update_vlan_filter(arg, 1, tag); 3932 } 3933 3934 static void 3935 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3936 { 3937 3938 if (if_getsoftc(ifp) != arg) 3939 return; 3940 3941 vtnet_update_vlan_filter(arg, 0, tag); 3942 } 3943 3944 static void 3945 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3946 { 3947 if_t ifp; 3948 uint32_t speed; 3949 3950 ifp = sc->vtnet_ifp; 3951 3952 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3953 return; 3954 3955 /* BMV: Ignore duplex. */ 3956 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3957 offsetof(struct virtio_net_config, speed)); 3958 if (speed != UINT32_MAX) 3959 if_setbaudrate(ifp, IF_Mbps(speed)); 3960 } 3961 3962 static int 3963 vtnet_is_link_up(struct vtnet_softc *sc) 3964 { 3965 uint16_t status; 3966 3967 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3968 return (1); 3969 3970 status = virtio_read_dev_config_2(sc->vtnet_dev, 3971 offsetof(struct virtio_net_config, status)); 3972 3973 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3974 } 3975 3976 static void 3977 vtnet_update_link_status(struct vtnet_softc *sc) 3978 { 3979 if_t ifp; 3980 int link; 3981 3982 ifp = sc->vtnet_ifp; 3983 VTNET_CORE_LOCK_ASSERT(sc); 3984 link = vtnet_is_link_up(sc); 3985 3986 /* Notify if the link status has changed. */ 3987 if (link != 0 && sc->vtnet_link_active == 0) { 3988 vtnet_update_speed_duplex(sc); 3989 sc->vtnet_link_active = 1; 3990 if_link_state_change(ifp, LINK_STATE_UP); 3991 } else if (link == 0 && sc->vtnet_link_active != 0) { 3992 sc->vtnet_link_active = 0; 3993 if_link_state_change(ifp, LINK_STATE_DOWN); 3994 } 3995 } 3996 3997 static int 3998 vtnet_ifmedia_upd(if_t ifp __unused) 3999 { 4000 return (EOPNOTSUPP); 4001 } 4002 4003 static void 4004 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 4005 { 4006 struct vtnet_softc *sc; 4007 4008 sc = if_getsoftc(ifp); 4009 4010 ifmr->ifm_status = IFM_AVALID; 4011 ifmr->ifm_active = IFM_ETHER; 4012 4013 VTNET_CORE_LOCK(sc); 4014 if (vtnet_is_link_up(sc) != 0) { 4015 ifmr->ifm_status |= IFM_ACTIVE; 4016 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 4017 } else 4018 ifmr->ifm_active |= IFM_NONE; 4019 VTNET_CORE_UNLOCK(sc); 4020 } 4021 4022 static void 4023 vtnet_get_macaddr(struct vtnet_softc *sc) 4024 { 4025 4026 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 4027 virtio_read_device_config_array(sc->vtnet_dev, 4028 offsetof(struct virtio_net_config, mac), 4029 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4030 } else { 4031 /* Generate a random locally administered unicast address. */ 4032 sc->vtnet_hwaddr[0] = 0xB2; 4033 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4034 } 4035 } 4036 4037 static void 4038 vtnet_set_macaddr(struct vtnet_softc *sc) 4039 { 4040 device_t dev; 4041 int error; 4042 4043 dev = sc->vtnet_dev; 4044 4045 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4046 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4047 if (error) 4048 device_printf(dev, "unable to set MAC address\n"); 4049 return; 4050 } 4051 4052 /* MAC in config is read-only in modern VirtIO. */ 4053 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4054 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4055 virtio_write_dev_config_1(dev, 4056 offsetof(struct virtio_net_config, mac) + i, 4057 sc->vtnet_hwaddr[i]); 4058 } 4059 } 4060 } 4061 4062 static void 4063 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4064 { 4065 4066 /* Assign MAC address if it was generated. */ 4067 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4068 vtnet_set_macaddr(sc); 4069 } 4070 4071 static void 4072 vtnet_vlan_tag_remove(struct mbuf *m) 4073 { 4074 struct ether_vlan_header *evh; 4075 4076 evh = mtod(m, struct ether_vlan_header *); 4077 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4078 m->m_flags |= M_VLANTAG; 4079 4080 /* Strip the 802.1Q header. */ 4081 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4082 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4083 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4084 } 4085 4086 static void 4087 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4088 { 4089 int limit; 4090 4091 limit = vtnet_tunable_int(sc, "rx_process_limit", 4092 vtnet_rx_process_limit); 4093 if (limit < 0) 4094 limit = INT_MAX; 4095 sc->vtnet_rx_process_limit = limit; 4096 } 4097 4098 static void 4099 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4100 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4101 { 4102 struct sysctl_oid *node; 4103 struct sysctl_oid_list *list; 4104 struct vtnet_rxq_stats *stats; 4105 char namebuf[16]; 4106 4107 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4108 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4109 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4110 list = SYSCTL_CHILDREN(node); 4111 4112 stats = &rxq->vtnrx_stats; 4113 4114 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD, 4115 &stats->vrxs_ipackets, "Receive packets"); 4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD, 4117 &stats->vrxs_ibytes, "Receive bytes"); 4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD, 4119 &stats->vrxs_iqdrops, "Receive drops"); 4120 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD, 4121 &stats->vrxs_ierrors, "Receive errors"); 4122 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4123 &stats->vrxs_csum, "Receive checksum offloaded"); 4124 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD, 4125 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4126 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD, 4127 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4128 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4129 &stats->vrxs_rescheduled, 4130 "Receive interrupt handler rescheduled"); 4131 } 4132 4133 static void 4134 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4135 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4136 { 4137 struct sysctl_oid *node; 4138 struct sysctl_oid_list *list; 4139 struct vtnet_txq_stats *stats; 4140 char namebuf[16]; 4141 4142 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4143 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4144 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4145 list = SYSCTL_CHILDREN(node); 4146 4147 stats = &txq->vtntx_stats; 4148 4149 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD, 4150 &stats->vtxs_opackets, "Transmit packets"); 4151 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD, 4152 &stats->vtxs_obytes, "Transmit bytes"); 4153 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD, 4154 &stats->vtxs_omcasts, "Transmit multicasts"); 4155 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD, 4156 &stats->vtxs_csum, "Transmit checksum offloaded"); 4157 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD, 4158 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4159 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD, 4160 &stats->vtxs_rescheduled, 4161 "Transmit interrupt handler rescheduled"); 4162 } 4163 4164 static void 4165 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4166 { 4167 device_t dev; 4168 struct sysctl_ctx_list *ctx; 4169 struct sysctl_oid *tree; 4170 struct sysctl_oid_list *child; 4171 int i; 4172 4173 dev = sc->vtnet_dev; 4174 ctx = device_get_sysctl_ctx(dev); 4175 tree = device_get_sysctl_tree(dev); 4176 child = SYSCTL_CHILDREN(tree); 4177 4178 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4179 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4180 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4181 } 4182 } 4183 4184 static void 4185 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4186 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4187 { 4188 struct vtnet_statistics *stats; 4189 struct vtnet_rxq_stats rxaccum; 4190 struct vtnet_txq_stats txaccum; 4191 4192 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4193 4194 stats = &sc->vtnet_stats; 4195 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4196 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4197 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4198 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4199 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4200 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4201 4202 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4203 CTLFLAG_RD, &stats->mbuf_alloc_failed, 4204 "Mbuf cluster allocation failures"); 4205 4206 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4207 CTLFLAG_RD, &stats->rx_frame_too_large, 4208 "Received frame larger than the mbuf chain"); 4209 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4210 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 4211 "Enqueuing the replacement receive mbuf failed"); 4212 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4213 CTLFLAG_RD, &stats->rx_mergeable_failed, 4214 "Mergeable buffers receive failures"); 4215 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4216 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 4217 "Received checksum offloaded buffer with unsupported " 4218 "Ethernet type"); 4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4220 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 4221 "Received checksum offloaded buffer with incorrect IP protocol"); 4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4223 CTLFLAG_RD, &stats->rx_csum_bad_offset, 4224 "Received checksum offloaded buffer with incorrect offset"); 4225 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto", 4226 CTLFLAG_RD, &stats->rx_csum_bad_proto, 4227 "Received checksum offloaded buffer with incorrect protocol"); 4228 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed", 4229 CTLFLAG_RD, &stats->rx_csum_failed, 4230 "Received buffer checksum offload failed"); 4231 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded", 4232 CTLFLAG_RD, &stats->rx_csum_offloaded, 4233 "Received buffer checksum offload succeeded"); 4234 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled", 4235 CTLFLAG_RD, &stats->rx_task_rescheduled, 4236 "Times the receive interrupt task rescheduled itself"); 4237 4238 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4239 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype, 4240 "Aborted transmit of checksum offloaded buffer with unknown " 4241 "Ethernet type"); 4242 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4243 CTLFLAG_RD, &stats->tx_csum_proto_mismatch, 4244 "Aborted transmit of checksum offloaded buffer because mismatched " 4245 "protocols"); 4246 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4247 CTLFLAG_RD, &stats->tx_tso_not_tcp, 4248 "Aborted transmit of TSO buffer with non TCP protocol"); 4249 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4250 CTLFLAG_RD, &stats->tx_tso_without_csum, 4251 "Aborted transmit of TSO buffer without TCP checksum offload"); 4252 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4253 CTLFLAG_RD, &stats->tx_defragged, 4254 "Transmit mbufs defragged"); 4255 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4256 CTLFLAG_RD, &stats->tx_defrag_failed, 4257 "Aborted transmit of buffer because defrag failed"); 4258 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded", 4259 CTLFLAG_RD, &stats->tx_csum_offloaded, 4260 "Offloaded checksum of transmitted buffer"); 4261 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded", 4262 CTLFLAG_RD, &stats->tx_tso_offloaded, 4263 "Segmentation offload of transmitted buffer"); 4264 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled", 4265 CTLFLAG_RD, &stats->tx_task_rescheduled, 4266 "Times the transmit interrupt task rescheduled itself"); 4267 } 4268 4269 static void 4270 vtnet_setup_sysctl(struct vtnet_softc *sc) 4271 { 4272 device_t dev; 4273 struct sysctl_ctx_list *ctx; 4274 struct sysctl_oid *tree; 4275 struct sysctl_oid_list *child; 4276 4277 dev = sc->vtnet_dev; 4278 ctx = device_get_sysctl_ctx(dev); 4279 tree = device_get_sysctl_tree(dev); 4280 child = SYSCTL_CHILDREN(tree); 4281 4282 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4283 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4284 "Number of maximum supported virtqueue pairs"); 4285 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4286 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4287 "Number of requested virtqueue pairs"); 4288 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4289 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4290 "Number of active virtqueue pairs"); 4291 4292 vtnet_setup_stat_sysctl(ctx, child, sc); 4293 } 4294 4295 static void 4296 vtnet_load_tunables(struct vtnet_softc *sc) 4297 { 4298 4299 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4300 "lro_entry_count", vtnet_lro_entry_count); 4301 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4302 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4303 4304 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4305 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4306 } 4307 4308 static int 4309 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4310 { 4311 4312 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4313 } 4314 4315 static void 4316 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4317 { 4318 4319 virtqueue_disable_intr(rxq->vtnrx_vq); 4320 } 4321 4322 static int 4323 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4324 { 4325 struct virtqueue *vq; 4326 4327 vq = txq->vtntx_vq; 4328 4329 if (vtnet_txq_below_threshold(txq) != 0) 4330 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4331 4332 /* 4333 * The free count is above our threshold. Keep the Tx interrupt 4334 * disabled until the queue is fuller. 4335 */ 4336 return (0); 4337 } 4338 4339 static void 4340 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4341 { 4342 4343 virtqueue_disable_intr(txq->vtntx_vq); 4344 } 4345 4346 static void 4347 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4348 { 4349 struct vtnet_rxq *rxq; 4350 int i; 4351 4352 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4353 rxq = &sc->vtnet_rxqs[i]; 4354 if (vtnet_rxq_enable_intr(rxq) != 0) 4355 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4356 } 4357 } 4358 4359 static void 4360 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4361 { 4362 int i; 4363 4364 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4365 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4366 } 4367 4368 static void 4369 vtnet_enable_interrupts(struct vtnet_softc *sc) 4370 { 4371 4372 vtnet_enable_rx_interrupts(sc); 4373 vtnet_enable_tx_interrupts(sc); 4374 } 4375 4376 static void 4377 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4378 { 4379 int i; 4380 4381 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4382 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4383 } 4384 4385 static void 4386 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4387 { 4388 int i; 4389 4390 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4391 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4392 } 4393 4394 static void 4395 vtnet_disable_interrupts(struct vtnet_softc *sc) 4396 { 4397 4398 vtnet_disable_rx_interrupts(sc); 4399 vtnet_disable_tx_interrupts(sc); 4400 } 4401 4402 static int 4403 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4404 { 4405 char path[64]; 4406 4407 snprintf(path, sizeof(path), 4408 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4409 TUNABLE_INT_FETCH(path, &def); 4410 4411 return (def); 4412 } 4413 4414 #ifdef DEBUGNET 4415 static void 4416 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4417 { 4418 struct vtnet_softc *sc; 4419 4420 sc = if_getsoftc(ifp); 4421 4422 VTNET_CORE_LOCK(sc); 4423 *nrxr = sc->vtnet_req_vq_pairs; 4424 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4425 *clsize = sc->vtnet_rx_clustersz; 4426 VTNET_CORE_UNLOCK(sc); 4427 } 4428 4429 static void 4430 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4431 { 4432 struct vtnet_softc *sc; 4433 static bool sw_lro_enabled = false; 4434 4435 /* 4436 * Disable software LRO, since it would require entering the network 4437 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4438 */ 4439 sc = if_getsoftc(ifp); 4440 switch (event) { 4441 case DEBUGNET_START: 4442 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4443 if (sw_lro_enabled) 4444 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4445 break; 4446 case DEBUGNET_END: 4447 if (sw_lro_enabled) 4448 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4449 break; 4450 } 4451 } 4452 4453 static int 4454 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4455 { 4456 struct vtnet_softc *sc; 4457 struct vtnet_txq *txq; 4458 int error; 4459 4460 sc = if_getsoftc(ifp); 4461 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4462 IFF_DRV_RUNNING) 4463 return (EBUSY); 4464 4465 txq = &sc->vtnet_txqs[0]; 4466 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4467 if (error == 0) 4468 (void)vtnet_txq_notify(txq); 4469 return (error); 4470 } 4471 4472 static int 4473 vtnet_debugnet_poll(if_t ifp, int count) 4474 { 4475 struct vtnet_softc *sc; 4476 int i; 4477 4478 sc = if_getsoftc(ifp); 4479 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4480 IFF_DRV_RUNNING) 4481 return (EBUSY); 4482 4483 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4484 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4485 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4486 return (0); 4487 } 4488 #endif /* DEBUGNET */ 4489