1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Driver for VirtIO network devices. */ 30 31 #include "opt_inet.h" 32 #include "opt_inet6.h" 33 34 #include <sys/param.h> 35 #include <sys/eventhandler.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/module.h> 42 #include <sys/msan.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/random.h> 46 #include <sys/sglist.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/taskqueue.h> 50 #include <sys/smp.h> 51 #include <machine/smp.h> 52 53 #include <vm/uma.h> 54 55 #include <net/debugnet.h> 56 #include <net/ethernet.h> 57 #include <net/pfil.h> 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_arp.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_media.h> 64 #include <net/if_vlan_var.h> 65 66 #include <net/bpf.h> 67 68 #include <netinet/in_systm.h> 69 #include <netinet/in.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip6.h> 72 #include <netinet6/ip6_var.h> 73 #include <netinet/udp.h> 74 #include <netinet/tcp.h> 75 #include <netinet/tcp_lro.h> 76 77 #include <machine/bus.h> 78 #include <machine/resource.h> 79 #include <sys/bus.h> 80 #include <sys/rman.h> 81 82 #include <dev/virtio/virtio.h> 83 #include <dev/virtio/virtqueue.h> 84 #include <dev/virtio/network/virtio_net.h> 85 #include <dev/virtio/network/if_vtnetvar.h> 86 #include "virtio_if.h" 87 88 #if defined(INET) || defined(INET6) 89 #include <machine/in_cksum.h> 90 #endif 91 92 #ifdef __NO_STRICT_ALIGNMENT 93 #define VTNET_ETHER_ALIGN 0 94 #else /* Strict alignment */ 95 #define VTNET_ETHER_ALIGN ETHER_ALIGN 96 #endif 97 98 static int vtnet_modevent(module_t, int, void *); 99 100 static int vtnet_probe(device_t); 101 static int vtnet_attach(device_t); 102 static int vtnet_detach(device_t); 103 static int vtnet_suspend(device_t); 104 static int vtnet_resume(device_t); 105 static int vtnet_shutdown(device_t); 106 static int vtnet_attach_completed(device_t); 107 static int vtnet_config_change(device_t); 108 109 static int vtnet_negotiate_features(struct vtnet_softc *); 110 static int vtnet_setup_features(struct vtnet_softc *); 111 static int vtnet_init_rxq(struct vtnet_softc *, int); 112 static int vtnet_init_txq(struct vtnet_softc *, int); 113 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *); 114 static void vtnet_free_rxtx_queues(struct vtnet_softc *); 115 static int vtnet_alloc_rx_filters(struct vtnet_softc *); 116 static void vtnet_free_rx_filters(struct vtnet_softc *); 117 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 118 static void vtnet_alloc_interface(struct vtnet_softc *); 119 static int vtnet_setup_interface(struct vtnet_softc *); 120 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int); 121 static int vtnet_ioctl_ifflags(struct vtnet_softc *); 122 static int vtnet_ioctl_multi(struct vtnet_softc *); 123 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *); 124 static int vtnet_ioctl(if_t, u_long, caddr_t); 125 static uint64_t vtnet_get_counter(if_t, ift_counter); 126 127 static int vtnet_rxq_populate(struct vtnet_rxq *); 128 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *); 129 static struct mbuf * 130 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **); 131 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *, 132 struct mbuf *, int); 133 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int); 134 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *); 135 static int vtnet_rxq_new_buf(struct vtnet_rxq *); 136 #if defined(INET) || defined(INET6) 137 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *, 138 bool, int, struct virtio_net_hdr *); 139 static void vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *, 140 int); 141 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *, 142 struct virtio_net_hdr *); 143 #endif 144 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int); 145 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *); 146 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int); 147 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *, 148 struct virtio_net_hdr *); 149 static int vtnet_rxq_eof(struct vtnet_rxq *); 150 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries); 151 static void vtnet_rx_vq_intr(void *); 152 static void vtnet_rxq_tq_intr(void *, int); 153 154 static int vtnet_txq_intr_threshold(struct vtnet_txq *); 155 static int vtnet_txq_below_threshold(struct vtnet_txq *); 156 static int vtnet_txq_notify(struct vtnet_txq *); 157 static void vtnet_txq_free_mbufs(struct vtnet_txq *); 158 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *, 159 int *, int *, int *); 160 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int, 161 int, struct virtio_net_hdr *); 162 static struct mbuf * 163 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *, 164 struct virtio_net_hdr *); 165 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **, 166 struct vtnet_tx_header *); 167 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int); 168 169 /* Required for ALTQ */ 170 static void vtnet_start_locked(struct vtnet_txq *, if_t); 171 static void vtnet_start(if_t); 172 173 /* Required for MQ */ 174 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *); 175 static int vtnet_txq_mq_start(if_t, struct mbuf *); 176 static void vtnet_txq_tq_deferred(void *, int); 177 static void vtnet_qflush(if_t); 178 179 180 static void vtnet_txq_start(struct vtnet_txq *); 181 static void vtnet_txq_tq_intr(void *, int); 182 static int vtnet_txq_eof(struct vtnet_txq *); 183 static void vtnet_tx_vq_intr(void *); 184 static void vtnet_tx_start_all(struct vtnet_softc *); 185 186 static int vtnet_watchdog(struct vtnet_txq *); 187 static void vtnet_accum_stats(struct vtnet_softc *, 188 struct vtnet_rxq_stats *, struct vtnet_txq_stats *); 189 static void vtnet_tick(void *); 190 191 static void vtnet_start_taskqueues(struct vtnet_softc *); 192 static void vtnet_free_taskqueues(struct vtnet_softc *); 193 static void vtnet_drain_taskqueues(struct vtnet_softc *); 194 195 static void vtnet_drain_rxtx_queues(struct vtnet_softc *); 196 static void vtnet_stop_rendezvous(struct vtnet_softc *); 197 static void vtnet_stop(struct vtnet_softc *); 198 static int vtnet_virtio_reinit(struct vtnet_softc *); 199 static void vtnet_init_rx_filters(struct vtnet_softc *); 200 static int vtnet_init_rx_queues(struct vtnet_softc *); 201 static int vtnet_init_tx_queues(struct vtnet_softc *); 202 static int vtnet_init_rxtx_queues(struct vtnet_softc *); 203 static void vtnet_set_active_vq_pairs(struct vtnet_softc *); 204 static void vtnet_update_rx_offloads(struct vtnet_softc *); 205 static int vtnet_reinit(struct vtnet_softc *); 206 static void vtnet_init_locked(struct vtnet_softc *, int); 207 static void vtnet_init(void *); 208 209 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 210 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 211 struct sglist *, int, int); 212 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 213 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t); 214 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t); 215 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool); 216 static int vtnet_set_promisc(struct vtnet_softc *, bool); 217 static int vtnet_set_allmulti(struct vtnet_softc *, bool); 218 static void vtnet_rx_filter(struct vtnet_softc *); 219 static void vtnet_rx_filter_mac(struct vtnet_softc *); 220 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 221 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 222 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t); 223 static void vtnet_register_vlan(void *, if_t, uint16_t); 224 static void vtnet_unregister_vlan(void *, if_t, uint16_t); 225 226 static void vtnet_update_speed_duplex(struct vtnet_softc *); 227 static int vtnet_is_link_up(struct vtnet_softc *); 228 static void vtnet_update_link_status(struct vtnet_softc *); 229 static int vtnet_ifmedia_upd(if_t); 230 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *); 231 static void vtnet_get_macaddr(struct vtnet_softc *); 232 static void vtnet_set_macaddr(struct vtnet_softc *); 233 static void vtnet_attached_set_macaddr(struct vtnet_softc *); 234 static void vtnet_vlan_tag_remove(struct mbuf *); 235 static void vtnet_set_rx_process_limit(struct vtnet_softc *); 236 237 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *, 238 struct sysctl_oid_list *, struct vtnet_rxq *); 239 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *, 240 struct sysctl_oid_list *, struct vtnet_txq *); 241 static void vtnet_setup_queue_sysctl(struct vtnet_softc *); 242 static void vtnet_load_tunables(struct vtnet_softc *); 243 static void vtnet_setup_sysctl(struct vtnet_softc *); 244 245 static int vtnet_rxq_enable_intr(struct vtnet_rxq *); 246 static void vtnet_rxq_disable_intr(struct vtnet_rxq *); 247 static int vtnet_txq_enable_intr(struct vtnet_txq *); 248 static void vtnet_txq_disable_intr(struct vtnet_txq *); 249 static void vtnet_enable_rx_interrupts(struct vtnet_softc *); 250 static void vtnet_enable_tx_interrupts(struct vtnet_softc *); 251 static void vtnet_enable_interrupts(struct vtnet_softc *); 252 static void vtnet_disable_rx_interrupts(struct vtnet_softc *); 253 static void vtnet_disable_tx_interrupts(struct vtnet_softc *); 254 static void vtnet_disable_interrupts(struct vtnet_softc *); 255 256 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int); 257 258 DEBUGNET_DEFINE(vtnet); 259 260 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val) 261 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val) 262 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val) 263 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val) 264 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val) 265 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val) 266 267 /* Tunables. */ 268 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 269 "VirtIO Net driver parameters"); 270 271 static int vtnet_csum_disable = 0; 272 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN, 273 &vtnet_csum_disable, 0, "Disables receive and send checksum offload"); 274 275 static int vtnet_fixup_needs_csum = 0; 276 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN, 277 &vtnet_fixup_needs_csum, 0, 278 "Calculate valid checksum for NEEDS_CSUM packets"); 279 280 static int vtnet_tso_disable = 0; 281 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN, 282 &vtnet_tso_disable, 0, "Disables TSO"); 283 284 static int vtnet_lro_disable = 0; 285 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN, 286 &vtnet_lro_disable, 0, "Disables hardware LRO"); 287 288 static int vtnet_mq_disable = 0; 289 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN, 290 &vtnet_mq_disable, 0, "Disables multiqueue support"); 291 292 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS; 293 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN, 294 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs"); 295 296 static int vtnet_tso_maxlen = IP_MAXPACKET; 297 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN, 298 &vtnet_tso_maxlen, 0, "TSO burst limit"); 299 300 static int vtnet_rx_process_limit = 1024; 301 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN, 302 &vtnet_rx_process_limit, 0, 303 "Number of RX segments processed in one pass"); 304 305 static int vtnet_lro_entry_count = 128; 306 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN, 307 &vtnet_lro_entry_count, 0, "Software LRO entry count"); 308 309 /* Enable sorted LRO, and the depth of the mbuf queue. */ 310 static int vtnet_lro_mbufq_depth = 0; 311 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN, 312 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue"); 313 314 /* Deactivate ALTQ Support */ 315 static int vtnet_altq_disable = 0; 316 SYSCTL_INT(_hw_vtnet, OID_AUTO, altq_disable, CTLFLAG_RDTUN, 317 &vtnet_altq_disable, 0, "Disables ALTQ Support"); 318 319 /* 320 * For the driver to be considered as having altq enabled, 321 * it must be compiled with an ALTQ capable kernel, 322 * and the tunable hw.vtnet.altq_disable must be zero 323 */ 324 #define VTNET_ALTQ_ENABLED (VTNET_ALTQ_CAPABLE && (!vtnet_altq_disable)) 325 326 327 static uma_zone_t vtnet_tx_header_zone; 328 329 static struct virtio_feature_desc vtnet_feature_desc[] = { 330 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 331 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 332 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" }, 333 { VIRTIO_NET_F_MAC, "MAC" }, 334 { VIRTIO_NET_F_GSO, "TxGSO" }, 335 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" }, 336 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" }, 337 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" }, 338 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 339 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 340 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 341 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 342 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 343 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 344 { VIRTIO_NET_F_STATUS, "Status" }, 345 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" }, 346 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" }, 347 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" }, 348 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" }, 349 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 350 { VIRTIO_NET_F_MQ, "Multiqueue" }, 351 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" }, 352 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" }, 353 354 { 0, NULL } 355 }; 356 357 static device_method_t vtnet_methods[] = { 358 /* Device methods. */ 359 DEVMETHOD(device_probe, vtnet_probe), 360 DEVMETHOD(device_attach, vtnet_attach), 361 DEVMETHOD(device_detach, vtnet_detach), 362 DEVMETHOD(device_suspend, vtnet_suspend), 363 DEVMETHOD(device_resume, vtnet_resume), 364 DEVMETHOD(device_shutdown, vtnet_shutdown), 365 366 /* VirtIO methods. */ 367 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed), 368 DEVMETHOD(virtio_config_change, vtnet_config_change), 369 370 DEVMETHOD_END 371 }; 372 373 #ifdef DEV_NETMAP 374 #include <dev/netmap/if_vtnet_netmap.h> 375 #endif 376 377 static driver_t vtnet_driver = { 378 .name = "vtnet", 379 .methods = vtnet_methods, 380 .size = sizeof(struct vtnet_softc) 381 }; 382 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL); 383 MODULE_VERSION(vtnet, 1); 384 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 385 #ifdef DEV_NETMAP 386 MODULE_DEPEND(vtnet, netmap, 1, 1, 1); 387 #endif 388 389 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter"); 390 391 static int 392 vtnet_modevent(module_t mod __unused, int type, void *unused __unused) 393 { 394 int error = 0; 395 static int loaded = 0; 396 397 switch (type) { 398 case MOD_LOAD: 399 if (loaded++ == 0) { 400 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr", 401 sizeof(struct vtnet_tx_header), 402 NULL, NULL, NULL, NULL, 0, 0); 403 #ifdef DEBUGNET 404 /* 405 * We need to allocate from this zone in the transmit path, so ensure 406 * that we have at least one item per header available. 407 * XXX add a separate zone like we do for mbufs? otherwise we may alloc 408 * buckets 409 */ 410 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 411 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2); 412 #endif 413 } 414 break; 415 case MOD_QUIESCE: 416 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0) 417 error = EBUSY; 418 break; 419 case MOD_UNLOAD: 420 if (--loaded == 0) { 421 uma_zdestroy(vtnet_tx_header_zone); 422 vtnet_tx_header_zone = NULL; 423 } 424 break; 425 case MOD_SHUTDOWN: 426 break; 427 default: 428 error = EOPNOTSUPP; 429 break; 430 } 431 432 return (error); 433 } 434 435 static int 436 vtnet_probe(device_t dev) 437 { 438 return (VIRTIO_SIMPLE_PROBE(dev, vtnet)); 439 } 440 441 static int 442 vtnet_attach(device_t dev) 443 { 444 struct vtnet_softc *sc; 445 int error; 446 447 sc = device_get_softc(dev); 448 sc->vtnet_dev = dev; 449 virtio_set_feature_desc(dev, vtnet_feature_desc); 450 451 VTNET_CORE_LOCK_INIT(sc); 452 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0); 453 vtnet_load_tunables(sc); 454 455 vtnet_alloc_interface(sc); 456 vtnet_setup_sysctl(sc); 457 458 error = vtnet_setup_features(sc); 459 if (error) { 460 device_printf(dev, "cannot setup features\n"); 461 goto fail; 462 } 463 464 error = vtnet_alloc_rx_filters(sc); 465 if (error) { 466 device_printf(dev, "cannot allocate Rx filters\n"); 467 goto fail; 468 } 469 470 error = vtnet_alloc_rxtx_queues(sc); 471 if (error) { 472 device_printf(dev, "cannot allocate queues\n"); 473 goto fail; 474 } 475 476 error = vtnet_alloc_virtqueues(sc); 477 if (error) { 478 device_printf(dev, "cannot allocate virtqueues\n"); 479 goto fail; 480 } 481 482 error = vtnet_setup_interface(sc); 483 if (error) { 484 device_printf(dev, "cannot setup interface\n"); 485 goto fail; 486 } 487 488 error = virtio_setup_intr(dev, INTR_TYPE_NET); 489 if (error) { 490 device_printf(dev, "cannot setup interrupts\n"); 491 ether_ifdetach(sc->vtnet_ifp); 492 goto fail; 493 } 494 495 #ifdef DEV_NETMAP 496 vtnet_netmap_attach(sc); 497 #endif 498 vtnet_start_taskqueues(sc); 499 500 fail: 501 if (error) 502 vtnet_detach(dev); 503 504 return (error); 505 } 506 507 static int 508 vtnet_detach(device_t dev) 509 { 510 struct vtnet_softc *sc; 511 if_t ifp; 512 513 sc = device_get_softc(dev); 514 ifp = sc->vtnet_ifp; 515 516 if (device_is_attached(dev)) { 517 VTNET_CORE_LOCK(sc); 518 vtnet_stop(sc); 519 VTNET_CORE_UNLOCK(sc); 520 521 callout_drain(&sc->vtnet_tick_ch); 522 vtnet_drain_taskqueues(sc); 523 524 ether_ifdetach(ifp); 525 } 526 527 #ifdef DEV_NETMAP 528 netmap_detach(ifp); 529 #endif 530 531 if (sc->vtnet_pfil != NULL) { 532 pfil_head_unregister(sc->vtnet_pfil); 533 sc->vtnet_pfil = NULL; 534 } 535 536 vtnet_free_taskqueues(sc); 537 538 if (sc->vtnet_vlan_attach != NULL) { 539 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 540 sc->vtnet_vlan_attach = NULL; 541 } 542 if (sc->vtnet_vlan_detach != NULL) { 543 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach); 544 sc->vtnet_vlan_detach = NULL; 545 } 546 547 ifmedia_removeall(&sc->vtnet_media); 548 549 if (ifp != NULL) { 550 if_free(ifp); 551 sc->vtnet_ifp = NULL; 552 } 553 554 vtnet_free_rxtx_queues(sc); 555 vtnet_free_rx_filters(sc); 556 557 if (sc->vtnet_ctrl_vq != NULL) 558 vtnet_free_ctrl_vq(sc); 559 560 VTNET_CORE_LOCK_DESTROY(sc); 561 562 return (0); 563 } 564 565 static int 566 vtnet_suspend(device_t dev) 567 { 568 struct vtnet_softc *sc; 569 570 sc = device_get_softc(dev); 571 572 VTNET_CORE_LOCK(sc); 573 vtnet_stop(sc); 574 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 575 VTNET_CORE_UNLOCK(sc); 576 577 return (0); 578 } 579 580 static int 581 vtnet_resume(device_t dev) 582 { 583 struct vtnet_softc *sc; 584 if_t ifp; 585 586 sc = device_get_softc(dev); 587 ifp = sc->vtnet_ifp; 588 589 VTNET_CORE_LOCK(sc); 590 if (if_getflags(ifp) & IFF_UP) 591 vtnet_init_locked(sc, 0); 592 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 593 VTNET_CORE_UNLOCK(sc); 594 595 return (0); 596 } 597 598 static int 599 vtnet_shutdown(device_t dev) 600 { 601 /* 602 * Suspend already does all of what we need to 603 * do here; we just never expect to be resumed. 604 */ 605 return (vtnet_suspend(dev)); 606 } 607 608 static int 609 vtnet_attach_completed(device_t dev) 610 { 611 struct vtnet_softc *sc; 612 613 sc = device_get_softc(dev); 614 615 VTNET_CORE_LOCK(sc); 616 vtnet_attached_set_macaddr(sc); 617 VTNET_CORE_UNLOCK(sc); 618 619 return (0); 620 } 621 622 static int 623 vtnet_config_change(device_t dev) 624 { 625 struct vtnet_softc *sc; 626 627 sc = device_get_softc(dev); 628 629 VTNET_CORE_LOCK(sc); 630 vtnet_update_link_status(sc); 631 if (sc->vtnet_link_active != 0) 632 vtnet_tx_start_all(sc); 633 VTNET_CORE_UNLOCK(sc); 634 635 return (0); 636 } 637 638 static int 639 vtnet_negotiate_features(struct vtnet_softc *sc) 640 { 641 device_t dev; 642 uint64_t features, negotiated_features; 643 int no_csum; 644 645 dev = sc->vtnet_dev; 646 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES : 647 VTNET_LEGACY_FEATURES; 648 649 /* 650 * TSO and LRO are only available when their corresponding checksum 651 * offload feature is also negotiated. 652 */ 653 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable); 654 if (no_csum) 655 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM); 656 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable)) 657 features &= ~VTNET_TSO_FEATURES; 658 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable)) 659 features &= ~VTNET_LRO_FEATURES; 660 661 /* Deactivate MQ Feature flag, if driver has ALTQ enabled, or MQ is explicitly disabled */ 662 if (VTNET_ALTQ_ENABLED || vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable)) 663 features &= ~VIRTIO_NET_F_MQ; 664 665 negotiated_features = virtio_negotiate_features(dev, features); 666 667 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 668 uint16_t mtu; 669 670 mtu = virtio_read_dev_config_2(dev, 671 offsetof(struct virtio_net_config, mtu)); 672 if (mtu < VTNET_MIN_MTU) { 673 device_printf(dev, "Invalid MTU value: %d. " 674 "MTU feature disabled.\n", mtu); 675 features &= ~VIRTIO_NET_F_MTU; 676 negotiated_features = 677 virtio_negotiate_features(dev, features); 678 } 679 } 680 681 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 682 uint16_t npairs; 683 684 npairs = virtio_read_dev_config_2(dev, 685 offsetof(struct virtio_net_config, max_virtqueue_pairs)); 686 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 687 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) { 688 device_printf(dev, "Invalid max_virtqueue_pairs value: " 689 "%d. Multiqueue feature disabled.\n", npairs); 690 features &= ~VIRTIO_NET_F_MQ; 691 negotiated_features = 692 virtio_negotiate_features(dev, features); 693 } 694 } 695 696 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) && 697 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) { 698 /* 699 * LRO without mergeable buffers requires special care. This 700 * is not ideal because every receive buffer must be large 701 * enough to hold the maximum TCP packet, the Ethernet header, 702 * and the header. This requires up to 34 descriptors with 703 * MCLBYTES clusters. If we do not have indirect descriptors, 704 * LRO is disabled since the virtqueue will not contain very 705 * many receive buffers. 706 */ 707 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) { 708 device_printf(dev, 709 "Host LRO disabled since both mergeable buffers " 710 "and indirect descriptors were not negotiated\n"); 711 features &= ~VTNET_LRO_FEATURES; 712 negotiated_features = 713 virtio_negotiate_features(dev, features); 714 } else 715 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG; 716 } 717 718 sc->vtnet_features = negotiated_features; 719 sc->vtnet_negotiated_features = negotiated_features; 720 721 return (virtio_finalize_features(dev)); 722 } 723 724 static int 725 vtnet_setup_features(struct vtnet_softc *sc) 726 { 727 device_t dev; 728 int error; 729 730 dev = sc->vtnet_dev; 731 732 error = vtnet_negotiate_features(sc); 733 if (error) 734 return (error); 735 736 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1)) 737 sc->vtnet_flags |= VTNET_FLAG_MODERN; 738 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) 739 sc->vtnet_flags |= VTNET_FLAG_INDIRECT; 740 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX)) 741 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX; 742 743 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 744 /* This feature should always be negotiated. */ 745 sc->vtnet_flags |= VTNET_FLAG_MAC; 746 } 747 748 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) { 749 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev, 750 offsetof(struct virtio_net_config, mtu)); 751 } else 752 sc->vtnet_max_mtu = VTNET_MAX_MTU; 753 754 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 755 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 756 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 757 } else if (vtnet_modern(sc)) { 758 /* This is identical to the mergeable header. */ 759 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1); 760 } else 761 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 762 763 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 764 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE; 765 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 766 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG; 767 else 768 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE; 769 770 /* 771 * Favor "hardware" LRO if negotiated, but support software LRO as 772 * a fallback; there is usually little benefit (or worse) with both. 773 */ 774 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 && 775 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0) 776 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 777 778 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) || 779 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) || 780 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 781 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX; 782 else 783 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN; 784 785 sc->vtnet_req_vq_pairs = 1; 786 sc->vtnet_max_vq_pairs = 1; 787 788 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 789 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 790 791 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 792 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 793 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 794 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 795 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR)) 796 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 797 798 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) { 799 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev, 800 offsetof(struct virtio_net_config, 801 max_virtqueue_pairs)); 802 } 803 } 804 805 if (sc->vtnet_max_vq_pairs > 1) { 806 int req; 807 808 /* 809 * Limit the maximum number of requested queue pairs to the 810 * number of CPUs and the configured maximum. 811 */ 812 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs); 813 if (req < 0) 814 req = 1; 815 if (req == 0) 816 req = mp_ncpus; 817 if (req > sc->vtnet_max_vq_pairs) 818 req = sc->vtnet_max_vq_pairs; 819 if (req > mp_ncpus) 820 req = mp_ncpus; 821 if (req > 1) { 822 sc->vtnet_req_vq_pairs = req; 823 sc->vtnet_flags |= VTNET_FLAG_MQ; 824 } 825 } 826 827 return (0); 828 } 829 830 static int 831 vtnet_init_rxq(struct vtnet_softc *sc, int id) 832 { 833 struct vtnet_rxq *rxq; 834 835 rxq = &sc->vtnet_rxqs[id]; 836 837 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d", 838 device_get_nameunit(sc->vtnet_dev), id); 839 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF); 840 841 rxq->vtnrx_sc = sc; 842 rxq->vtnrx_id = id; 843 844 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT); 845 if (rxq->vtnrx_sg == NULL) 846 return (ENOMEM); 847 848 #if defined(INET) || defined(INET6) 849 if (vtnet_software_lro(sc)) { 850 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp, 851 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0) 852 return (ENOMEM); 853 } 854 #endif 855 856 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq); 857 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT, 858 taskqueue_thread_enqueue, &rxq->vtnrx_tq); 859 860 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0); 861 } 862 863 static int 864 vtnet_init_txq(struct vtnet_softc *sc, int id) 865 { 866 struct vtnet_txq *txq; 867 868 txq = &sc->vtnet_txqs[id]; 869 870 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d", 871 device_get_nameunit(sc->vtnet_dev), id); 872 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF); 873 874 txq->vtntx_sc = sc; 875 txq->vtntx_id = id; 876 877 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT); 878 if (txq->vtntx_sg == NULL) 879 return (ENOMEM); 880 881 if (!VTNET_ALTQ_ENABLED) { 882 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF, 883 M_NOWAIT, &txq->vtntx_mtx); 884 if (txq->vtntx_br == NULL) 885 return (ENOMEM); 886 887 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq); 888 } 889 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq); 890 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT, 891 taskqueue_thread_enqueue, &txq->vtntx_tq); 892 if (txq->vtntx_tq == NULL) 893 return (ENOMEM); 894 895 return (0); 896 } 897 898 static int 899 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc) 900 { 901 int i, npairs, error; 902 903 npairs = sc->vtnet_max_vq_pairs; 904 905 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF, 906 M_NOWAIT | M_ZERO); 907 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF, 908 M_NOWAIT | M_ZERO); 909 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL) 910 return (ENOMEM); 911 912 for (i = 0; i < npairs; i++) { 913 error = vtnet_init_rxq(sc, i); 914 if (error) 915 return (error); 916 error = vtnet_init_txq(sc, i); 917 if (error) 918 return (error); 919 } 920 921 vtnet_set_rx_process_limit(sc); 922 vtnet_setup_queue_sysctl(sc); 923 924 return (0); 925 } 926 927 static void 928 vtnet_destroy_rxq(struct vtnet_rxq *rxq) 929 { 930 931 rxq->vtnrx_sc = NULL; 932 rxq->vtnrx_id = -1; 933 934 #if defined(INET) || defined(INET6) 935 tcp_lro_free(&rxq->vtnrx_lro); 936 #endif 937 938 if (rxq->vtnrx_sg != NULL) { 939 sglist_free(rxq->vtnrx_sg); 940 rxq->vtnrx_sg = NULL; 941 } 942 943 if (mtx_initialized(&rxq->vtnrx_mtx) != 0) 944 mtx_destroy(&rxq->vtnrx_mtx); 945 } 946 947 static void 948 vtnet_destroy_txq(struct vtnet_txq *txq) 949 { 950 951 txq->vtntx_sc = NULL; 952 txq->vtntx_id = -1; 953 954 if (txq->vtntx_sg != NULL) { 955 sglist_free(txq->vtntx_sg); 956 txq->vtntx_sg = NULL; 957 } 958 959 if (!VTNET_ALTQ_ENABLED) { 960 if (txq->vtntx_br != NULL) { 961 buf_ring_free(txq->vtntx_br, M_DEVBUF); 962 txq->vtntx_br = NULL; 963 } 964 } 965 966 if (mtx_initialized(&txq->vtntx_mtx) != 0) 967 mtx_destroy(&txq->vtntx_mtx); 968 } 969 970 static void 971 vtnet_free_rxtx_queues(struct vtnet_softc *sc) 972 { 973 int i; 974 975 if (sc->vtnet_rxqs != NULL) { 976 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 977 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]); 978 free(sc->vtnet_rxqs, M_DEVBUF); 979 sc->vtnet_rxqs = NULL; 980 } 981 982 if (sc->vtnet_txqs != NULL) { 983 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 984 vtnet_destroy_txq(&sc->vtnet_txqs[i]); 985 free(sc->vtnet_txqs, M_DEVBUF); 986 sc->vtnet_txqs = NULL; 987 } 988 } 989 990 static int 991 vtnet_alloc_rx_filters(struct vtnet_softc *sc) 992 { 993 994 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 995 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter), 996 M_DEVBUF, M_NOWAIT | M_ZERO); 997 if (sc->vtnet_mac_filter == NULL) 998 return (ENOMEM); 999 } 1000 1001 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1002 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) * 1003 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO); 1004 if (sc->vtnet_vlan_filter == NULL) 1005 return (ENOMEM); 1006 } 1007 1008 return (0); 1009 } 1010 1011 static void 1012 vtnet_free_rx_filters(struct vtnet_softc *sc) 1013 { 1014 1015 if (sc->vtnet_mac_filter != NULL) { 1016 free(sc->vtnet_mac_filter, M_DEVBUF); 1017 sc->vtnet_mac_filter = NULL; 1018 } 1019 1020 if (sc->vtnet_vlan_filter != NULL) { 1021 free(sc->vtnet_vlan_filter, M_DEVBUF); 1022 sc->vtnet_vlan_filter = NULL; 1023 } 1024 } 1025 1026 static int 1027 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 1028 { 1029 device_t dev; 1030 struct vq_alloc_info *info; 1031 struct vtnet_rxq *rxq; 1032 struct vtnet_txq *txq; 1033 int i, idx, nvqs, error; 1034 1035 dev = sc->vtnet_dev; 1036 1037 nvqs = sc->vtnet_max_vq_pairs * 2; 1038 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 1039 nvqs++; 1040 1041 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 1042 if (info == NULL) 1043 return (ENOMEM); 1044 1045 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) { 1046 rxq = &sc->vtnet_rxqs[i]; 1047 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs, 1048 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq, 1049 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1050 1051 txq = &sc->vtnet_txqs[i]; 1052 VQ_ALLOC_INFO_INIT(&info[idx + 1], sc->vtnet_tx_nsegs, 1053 vtnet_tx_vq_intr, txq, &txq->vtntx_vq, 1054 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1055 } 1056 1057 /* These queues will not be used so allocate the minimum resources. */ 1058 for (; i < sc->vtnet_max_vq_pairs; i++, idx += 2) { 1059 rxq = &sc->vtnet_rxqs[i]; 1060 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq, 1061 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id); 1062 1063 txq = &sc->vtnet_txqs[i]; 1064 VQ_ALLOC_INFO_INIT(&info[idx + 1], 0, NULL, txq, &txq->vtntx_vq, 1065 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id); 1066 } 1067 1068 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 1069 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL, 1070 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev)); 1071 } 1072 1073 error = virtio_alloc_virtqueues(dev, nvqs, info); 1074 free(info, M_TEMP); 1075 1076 return (error); 1077 } 1078 1079 static void 1080 vtnet_alloc_interface(struct vtnet_softc *sc) 1081 { 1082 device_t dev; 1083 if_t ifp; 1084 1085 dev = sc->vtnet_dev; 1086 1087 ifp = if_alloc(IFT_ETHER); 1088 sc->vtnet_ifp = ifp; 1089 if_setsoftc(ifp, sc); 1090 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 1091 } 1092 1093 static int 1094 vtnet_setup_interface(struct vtnet_softc *sc) 1095 { 1096 device_t dev; 1097 struct pfil_head_args pa; 1098 if_t ifp; 1099 1100 dev = sc->vtnet_dev; 1101 ifp = sc->vtnet_ifp; 1102 1103 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 1104 if_setbaudrate(ifp, IF_Gbps(10)); 1105 if_setinitfn(ifp, vtnet_init); 1106 if_setioctlfn(ifp, vtnet_ioctl); 1107 if_setgetcounterfn(ifp, vtnet_get_counter); 1108 1109 if (!VTNET_ALTQ_ENABLED) { 1110 if_settransmitfn(ifp, vtnet_txq_mq_start); 1111 if_setqflushfn(ifp, vtnet_qflush); 1112 } else { 1113 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq; 1114 if_setstartfn(ifp, vtnet_start); 1115 if_setsendqlen(ifp, virtqueue_size(vq) - 1); 1116 if_setsendqready(ifp); 1117 } 1118 1119 vtnet_get_macaddr(sc); 1120 1121 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) 1122 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0); 1123 1124 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts); 1125 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL); 1126 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO); 1127 1128 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 1129 int gso; 1130 1131 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0); 1132 1133 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO); 1134 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 1135 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0); 1136 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 1137 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0); 1138 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 1139 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 1140 1141 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) { 1142 int tso_maxlen; 1143 1144 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0); 1145 1146 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen", 1147 vtnet_tso_maxlen); 1148 if_sethwtsomax(ifp, tso_maxlen - 1149 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 1150 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1); 1151 if_sethwtsomaxsegsize(ifp, PAGE_SIZE); 1152 } 1153 } 1154 1155 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 1156 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1157 #ifdef notyet 1158 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1159 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1160 #endif 1161 1162 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1163 vtnet_fixup_needs_csum) != 0) 1164 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1165 1166 /* Support either "hardware" or software LRO. */ 1167 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1168 } 1169 1170 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1171 /* 1172 * VirtIO does not support VLAN tagging, but we can fake 1173 * it by inserting and removing the 802.1Q header during 1174 * transmit and receive. We are then able to do checksum 1175 * offloading of VLAN frames. 1176 */ 1177 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1178 } 1179 1180 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1181 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1182 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1183 if_setcapabilitiesbit(ifp, IFCAP_HWSTATS, 0); 1184 1185 /* 1186 * Capabilities after here are not enabled by default. 1187 */ 1188 if_setcapenable(ifp, if_getcapabilities(ifp)); 1189 1190 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1191 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1192 1193 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1194 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1195 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1196 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1197 } 1198 1199 ether_ifattach(ifp, sc->vtnet_hwaddr); 1200 1201 /* Tell the upper layer(s) we support long frames. */ 1202 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1203 1204 DEBUGNET_SET(ifp, vtnet); 1205 1206 pa.pa_version = PFIL_VERSION; 1207 pa.pa_flags = PFIL_IN; 1208 pa.pa_type = PFIL_TYPE_ETHERNET; 1209 pa.pa_headname = if_name(ifp); 1210 sc->vtnet_pfil = pfil_head_register(&pa); 1211 1212 return (0); 1213 } 1214 1215 static int 1216 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1217 { 1218 int framesz; 1219 1220 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1221 return (MJUMPAGESIZE); 1222 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1223 return (MCLBYTES); 1224 1225 /* 1226 * Try to scale the receive mbuf cluster size from the MTU. We 1227 * could also use the VQ size to influence the selected size, 1228 * but that would only matter for very small queues. 1229 */ 1230 if (vtnet_modern(sc)) { 1231 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1232 framesz = sizeof(struct virtio_net_hdr_v1); 1233 } else 1234 framesz = sizeof(struct vtnet_rx_header); 1235 framesz += sizeof(struct ether_vlan_header) + mtu; 1236 /* 1237 * Account for the offsetting we'll do elsewhere so we allocate the 1238 * right size for the mtu. 1239 */ 1240 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1241 framesz += VTNET_ETHER_ALIGN; 1242 } 1243 1244 if (framesz <= MCLBYTES) 1245 return (MCLBYTES); 1246 else if (framesz <= MJUMPAGESIZE) 1247 return (MJUMPAGESIZE); 1248 else if (framesz <= MJUM9BYTES) 1249 return (MJUM9BYTES); 1250 1251 /* Sane default; avoid 16KB clusters. */ 1252 return (MCLBYTES); 1253 } 1254 1255 static int 1256 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1257 { 1258 if_t ifp; 1259 int clustersz; 1260 1261 ifp = sc->vtnet_ifp; 1262 VTNET_CORE_LOCK_ASSERT(sc); 1263 1264 if (if_getmtu(ifp) == mtu) 1265 return (0); 1266 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1267 return (EINVAL); 1268 1269 if_setmtu(ifp, mtu); 1270 clustersz = vtnet_rx_cluster_size(sc, mtu); 1271 1272 if (clustersz != sc->vtnet_rx_clustersz && 1273 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1274 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1275 vtnet_init_locked(sc, 0); 1276 } 1277 1278 return (0); 1279 } 1280 1281 static int 1282 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1283 { 1284 if_t ifp; 1285 int drv_running; 1286 1287 ifp = sc->vtnet_ifp; 1288 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1289 1290 VTNET_CORE_LOCK_ASSERT(sc); 1291 1292 if ((if_getflags(ifp) & IFF_UP) == 0) { 1293 if (drv_running) 1294 vtnet_stop(sc); 1295 goto out; 1296 } 1297 1298 if (!drv_running) { 1299 vtnet_init_locked(sc, 0); 1300 goto out; 1301 } 1302 1303 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1304 (IFF_PROMISC | IFF_ALLMULTI)) { 1305 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1306 vtnet_rx_filter(sc); 1307 else { 1308 /* 1309 * We don't support filtering out multicast, so 1310 * ALLMULTI is always set. 1311 */ 1312 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1313 if_setflagbits(ifp, IFF_PROMISC, 0); 1314 } 1315 } 1316 1317 out: 1318 sc->vtnet_if_flags = if_getflags(ifp); 1319 return (0); 1320 } 1321 1322 static int 1323 vtnet_ioctl_multi(struct vtnet_softc *sc) 1324 { 1325 if_t ifp; 1326 1327 ifp = sc->vtnet_ifp; 1328 1329 VTNET_CORE_LOCK_ASSERT(sc); 1330 1331 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1332 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1333 vtnet_rx_filter_mac(sc); 1334 1335 return (0); 1336 } 1337 1338 static int 1339 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1340 { 1341 if_t ifp; 1342 int mask, reinit, update; 1343 1344 ifp = sc->vtnet_ifp; 1345 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1346 reinit = update = 0; 1347 1348 VTNET_CORE_LOCK_ASSERT(sc); 1349 1350 if (mask & IFCAP_TXCSUM) 1351 if_togglecapenable(ifp, IFCAP_TXCSUM); 1352 if (mask & IFCAP_TXCSUM_IPV6) 1353 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1354 if (mask & IFCAP_TSO4) 1355 if_togglecapenable(ifp, IFCAP_TSO4); 1356 if (mask & IFCAP_TSO6) 1357 if_togglecapenable(ifp, IFCAP_TSO6); 1358 1359 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1360 /* 1361 * These Rx features require the negotiated features to 1362 * be updated. Avoid a full reinit if possible. 1363 */ 1364 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1365 update = 1; 1366 else 1367 reinit = 1; 1368 1369 /* BMV: Avoid needless renegotiation for just software LRO. */ 1370 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1371 IFCAP_LRO && vtnet_software_lro(sc)) 1372 reinit = update = 0; 1373 1374 if (mask & IFCAP_RXCSUM) 1375 if_togglecapenable(ifp, IFCAP_RXCSUM); 1376 if (mask & IFCAP_RXCSUM_IPV6) 1377 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1378 if (mask & IFCAP_LRO) 1379 if_togglecapenable(ifp, IFCAP_LRO); 1380 1381 /* 1382 * VirtIO does not distinguish between IPv4 and IPv6 checksums 1383 * so treat them as a pair. Guest TSO (LRO) requires receive 1384 * checksums. 1385 */ 1386 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1387 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0); 1388 #ifdef notyet 1389 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0); 1390 #endif 1391 } else 1392 if_setcapenablebit(ifp, 0, 1393 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)); 1394 } 1395 1396 if (mask & IFCAP_VLAN_HWFILTER) { 1397 /* These Rx features require renegotiation. */ 1398 reinit = 1; 1399 1400 if (mask & IFCAP_VLAN_HWFILTER) 1401 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1402 } 1403 1404 if (mask & IFCAP_VLAN_HWTSO) 1405 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1406 if (mask & IFCAP_VLAN_HWTAGGING) 1407 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1408 1409 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1410 if (reinit) { 1411 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1412 vtnet_init_locked(sc, 0); 1413 } else if (update) 1414 vtnet_update_rx_offloads(sc); 1415 } 1416 1417 return (0); 1418 } 1419 1420 static int 1421 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1422 { 1423 struct vtnet_softc *sc; 1424 struct ifreq *ifr; 1425 int error; 1426 1427 sc = if_getsoftc(ifp); 1428 ifr = (struct ifreq *) data; 1429 error = 0; 1430 1431 switch (cmd) { 1432 case SIOCSIFMTU: 1433 VTNET_CORE_LOCK(sc); 1434 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1435 VTNET_CORE_UNLOCK(sc); 1436 break; 1437 1438 case SIOCSIFFLAGS: 1439 VTNET_CORE_LOCK(sc); 1440 error = vtnet_ioctl_ifflags(sc); 1441 VTNET_CORE_UNLOCK(sc); 1442 break; 1443 1444 case SIOCADDMULTI: 1445 case SIOCDELMULTI: 1446 VTNET_CORE_LOCK(sc); 1447 error = vtnet_ioctl_multi(sc); 1448 VTNET_CORE_UNLOCK(sc); 1449 break; 1450 1451 case SIOCSIFMEDIA: 1452 case SIOCGIFMEDIA: 1453 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1454 break; 1455 1456 case SIOCSIFCAP: 1457 VTNET_CORE_LOCK(sc); 1458 error = vtnet_ioctl_ifcap(sc, ifr); 1459 VTNET_CORE_UNLOCK(sc); 1460 VLAN_CAPABILITIES(ifp); 1461 break; 1462 1463 default: 1464 error = ether_ioctl(ifp, cmd, data); 1465 break; 1466 } 1467 1468 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1469 1470 return (error); 1471 } 1472 1473 static int 1474 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1475 { 1476 struct virtqueue *vq; 1477 int nbufs, error; 1478 1479 #ifdef DEV_NETMAP 1480 error = vtnet_netmap_rxq_populate(rxq); 1481 if (error >= 0) 1482 return (error); 1483 #endif /* DEV_NETMAP */ 1484 1485 vq = rxq->vtnrx_vq; 1486 error = ENOSPC; 1487 1488 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1489 error = vtnet_rxq_new_buf(rxq); 1490 if (error) 1491 break; 1492 } 1493 1494 if (nbufs > 0) { 1495 virtqueue_notify(vq); 1496 /* 1497 * EMSGSIZE signifies the virtqueue did not have enough 1498 * entries available to hold the last mbuf. This is not 1499 * an error. 1500 */ 1501 if (error == EMSGSIZE) 1502 error = 0; 1503 } 1504 1505 return (error); 1506 } 1507 1508 static void 1509 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1510 { 1511 struct virtqueue *vq; 1512 struct mbuf *m; 1513 int last; 1514 #ifdef DEV_NETMAP 1515 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1516 rxq->vtnrx_id, NR_RX); 1517 #else /* !DEV_NETMAP */ 1518 void *kring = NULL; 1519 #endif /* !DEV_NETMAP */ 1520 1521 vq = rxq->vtnrx_vq; 1522 last = 0; 1523 1524 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1525 if (kring == NULL) 1526 m_freem(m); 1527 } 1528 1529 KASSERT(virtqueue_empty(vq), 1530 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1531 } 1532 1533 static struct mbuf * 1534 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1535 { 1536 struct mbuf *m_head, *m_tail, *m; 1537 int i, size; 1538 1539 m_head = NULL; 1540 size = sc->vtnet_rx_clustersz; 1541 1542 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1543 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1544 1545 for (i = 0; i < nbufs; i++) { 1546 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1547 if (m == NULL) { 1548 sc->vtnet_stats.mbuf_alloc_failed++; 1549 m_freem(m_head); 1550 return (NULL); 1551 } 1552 1553 m->m_len = size; 1554 /* 1555 * Need to offset the mbuf if the header we're going to add 1556 * will misalign. 1557 */ 1558 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1559 m_adj(m, VTNET_ETHER_ALIGN); 1560 } 1561 if (m_head != NULL) { 1562 m_tail->m_next = m; 1563 m_tail = m; 1564 } else 1565 m_head = m_tail = m; 1566 } 1567 1568 if (m_tailp != NULL) 1569 *m_tailp = m_tail; 1570 1571 return (m_head); 1572 } 1573 1574 /* 1575 * Slow path for when LRO without mergeable buffers is negotiated. 1576 */ 1577 static int 1578 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1579 int len0) 1580 { 1581 struct vtnet_softc *sc; 1582 struct mbuf *m, *m_prev, *m_new, *m_tail; 1583 int len, clustersz, nreplace, error; 1584 1585 sc = rxq->vtnrx_sc; 1586 clustersz = sc->vtnet_rx_clustersz; 1587 /* 1588 * Need to offset the mbuf if the header we're going to add will 1589 * misalign, account for that here. 1590 */ 1591 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) 1592 clustersz -= VTNET_ETHER_ALIGN; 1593 1594 m_prev = NULL; 1595 m_tail = NULL; 1596 nreplace = 0; 1597 1598 m = m0; 1599 len = len0; 1600 1601 /* 1602 * Since these mbuf chains are so large, avoid allocating a complete 1603 * replacement when the received frame did not consume the entire 1604 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1605 */ 1606 while (len > 0) { 1607 if (m == NULL) { 1608 sc->vtnet_stats.rx_frame_too_large++; 1609 return (EMSGSIZE); 1610 } 1611 1612 /* 1613 * Every mbuf should have the expected cluster size since that 1614 * is also used to allocate the replacements. 1615 */ 1616 KASSERT(m->m_len == clustersz, 1617 ("%s: mbuf size %d not expected cluster size %d", __func__, 1618 m->m_len, clustersz)); 1619 1620 m->m_len = MIN(m->m_len, len); 1621 len -= m->m_len; 1622 1623 m_prev = m; 1624 m = m->m_next; 1625 nreplace++; 1626 } 1627 1628 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1629 ("%s: invalid replacement mbuf count %d max %d", __func__, 1630 nreplace, sc->vtnet_rx_nmbufs)); 1631 1632 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1633 if (m_new == NULL) { 1634 m_prev->m_len = clustersz; 1635 return (ENOBUFS); 1636 } 1637 1638 /* 1639 * Move any unused mbufs from the received mbuf chain onto the 1640 * end of the replacement chain. 1641 */ 1642 if (m_prev->m_next != NULL) { 1643 m_tail->m_next = m_prev->m_next; 1644 m_prev->m_next = NULL; 1645 } 1646 1647 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1648 if (error) { 1649 /* 1650 * The replacement is suppose to be an copy of the one 1651 * dequeued so this is a very unexpected error. 1652 * 1653 * Restore the m0 chain to the original state if it was 1654 * modified so we can then discard it. 1655 */ 1656 if (m_tail->m_next != NULL) { 1657 m_prev->m_next = m_tail->m_next; 1658 m_tail->m_next = NULL; 1659 } 1660 m_prev->m_len = clustersz; 1661 sc->vtnet_stats.rx_enq_replacement_failed++; 1662 m_freem(m_new); 1663 } 1664 1665 return (error); 1666 } 1667 1668 static int 1669 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1670 { 1671 struct vtnet_softc *sc; 1672 struct mbuf *m_new; 1673 int error; 1674 1675 sc = rxq->vtnrx_sc; 1676 1677 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1678 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1679 1680 MPASS(m->m_next == NULL); 1681 if (m->m_len < len) 1682 return (EMSGSIZE); 1683 1684 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1685 if (m_new == NULL) 1686 return (ENOBUFS); 1687 1688 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1689 if (error) { 1690 sc->vtnet_stats.rx_enq_replacement_failed++; 1691 m_freem(m_new); 1692 } else 1693 m->m_len = len; 1694 1695 return (error); 1696 } 1697 1698 static int 1699 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1700 { 1701 struct vtnet_softc *sc; 1702 struct sglist *sg; 1703 int header_inlined, error; 1704 1705 sc = rxq->vtnrx_sc; 1706 sg = rxq->vtnrx_sg; 1707 1708 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1709 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1710 VTNET_RXQ_LOCK_ASSERT(rxq); 1711 1712 sglist_reset(sg); 1713 header_inlined = vtnet_modern(sc) || 1714 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1715 1716 /* 1717 * Note: The mbuf has been already adjusted when we allocate it if we 1718 * have to do strict alignment. 1719 */ 1720 if (header_inlined) 1721 error = sglist_append_mbuf(sg, m); 1722 else { 1723 struct vtnet_rx_header *rxhdr = 1724 mtod(m, struct vtnet_rx_header *); 1725 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1726 1727 /* Append the header and remaining mbuf data. */ 1728 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1729 if (error) 1730 return (error); 1731 error = sglist_append(sg, &rxhdr[1], 1732 m->m_len - sizeof(struct vtnet_rx_header)); 1733 if (error) 1734 return (error); 1735 1736 if (m->m_next != NULL) 1737 error = sglist_append_mbuf(sg, m->m_next); 1738 } 1739 1740 if (error) 1741 return (error); 1742 1743 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1744 } 1745 1746 static int 1747 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1748 { 1749 struct vtnet_softc *sc; 1750 struct mbuf *m; 1751 int error; 1752 1753 sc = rxq->vtnrx_sc; 1754 1755 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1756 if (m == NULL) 1757 return (ENOBUFS); 1758 1759 error = vtnet_rxq_enqueue_buf(rxq, m); 1760 if (error) 1761 m_freem(m); 1762 1763 return (error); 1764 } 1765 1766 #if defined(INET) || defined(INET6) 1767 static int 1768 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, bool isipv6, 1769 int protocol, struct virtio_net_hdr *hdr) 1770 { 1771 struct vtnet_softc *sc; 1772 1773 /* 1774 * The packet is likely from another VM on the same host or from the 1775 * host that itself performed checksum offloading so Tx/Rx is basically 1776 * a memcpy and the checksum has little value so far. 1777 */ 1778 1779 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP, 1780 ("%s: unsupported IP protocol %d", __func__, protocol)); 1781 1782 /* 1783 * If the user don't want us to fix it up here by computing the 1784 * checksum, just forward the order to compute the checksum by setting 1785 * the corresponding mbuf flag (e.g., CSUM_TCP). 1786 */ 1787 sc = rxq->vtnrx_sc; 1788 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1789 switch (protocol) { 1790 case IPPROTO_TCP: 1791 m->m_pkthdr.csum_flags |= 1792 (isipv6 ? CSUM_TCP_IPV6 : CSUM_TCP); 1793 break; 1794 case IPPROTO_UDP: 1795 m->m_pkthdr.csum_flags |= 1796 (isipv6 ? CSUM_UDP_IPV6 : CSUM_UDP); 1797 break; 1798 } 1799 m->m_pkthdr.csum_data = hdr->csum_offset; 1800 return (0); 1801 } 1802 1803 /* 1804 * Compute the checksum in the driver so the packet will contain a 1805 * valid checksum. The checksum is at csum_offset from csum_start. 1806 */ 1807 int csum_off, csum_end; 1808 uint16_t csum; 1809 1810 csum_off = hdr->csum_start + hdr->csum_offset; 1811 csum_end = csum_off + sizeof(uint16_t); 1812 1813 /* Assume checksum will be in the first mbuf. */ 1814 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) { 1815 sc->vtnet_stats.rx_csum_bad_offset++; 1816 return (1); 1817 } 1818 1819 /* 1820 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1821 * checksum and write it at the specified offset. We could 1822 * try to verify the packet: csum_start should probably 1823 * correspond to the start of the TCP/UDP header. 1824 * 1825 * BMV: Need to properly handle UDP with zero checksum. Is 1826 * the IPv4 header checksum implicitly validated? 1827 */ 1828 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1829 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1830 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1831 m->m_pkthdr.csum_data = 0xFFFF; 1832 1833 return (0); 1834 } 1835 1836 static void 1837 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, int protocol) 1838 { 1839 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP, 1840 ("%s: unsupported IP protocol %d", __func__, protocol)); 1841 1842 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1843 m->m_pkthdr.csum_data = 0xFFFF; 1844 } 1845 1846 static int 1847 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1848 struct virtio_net_hdr *hdr) 1849 { 1850 const struct ether_header *eh; 1851 struct vtnet_softc *sc; 1852 int hoff, protocol; 1853 uint16_t etype; 1854 bool isipv6; 1855 1856 KASSERT(hdr->flags & 1857 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID), 1858 ("%s: missing checksum offloading flag %x", __func__, hdr->flags)); 1859 1860 eh = mtod(m, const struct ether_header *); 1861 etype = ntohs(eh->ether_type); 1862 if (etype == ETHERTYPE_VLAN) { 1863 /* TODO BMV: Handle QinQ. */ 1864 const struct ether_vlan_header *evh = 1865 mtod(m, const struct ether_vlan_header *); 1866 etype = ntohs(evh->evl_proto); 1867 hoff = sizeof(struct ether_vlan_header); 1868 } else 1869 hoff = sizeof(struct ether_header); 1870 1871 sc = rxq->vtnrx_sc; 1872 1873 /* Check whether ethernet type is IP or IPv6, and get protocol. */ 1874 switch (etype) { 1875 #if defined(INET) 1876 case ETHERTYPE_IP: 1877 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) { 1878 sc->vtnet_stats.rx_csum_inaccessible_ipproto++; 1879 return (1); 1880 } else { 1881 struct ip *ip = (struct ip *)(m->m_data + hoff); 1882 protocol = ip->ip_p; 1883 } 1884 isipv6 = false; 1885 break; 1886 #endif 1887 #if defined(INET6) 1888 case ETHERTYPE_IPV6: 1889 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1890 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) { 1891 sc->vtnet_stats.rx_csum_inaccessible_ipproto++; 1892 return (1); 1893 } 1894 isipv6 = true; 1895 break; 1896 #endif 1897 default: 1898 sc->vtnet_stats.rx_csum_bad_ethtype++; 1899 return (1); 1900 } 1901 1902 /* Check whether protocol is TCP or UDP. */ 1903 switch (protocol) { 1904 case IPPROTO_TCP: 1905 case IPPROTO_UDP: 1906 break; 1907 default: 1908 /* 1909 * FreeBSD does not support checksum offloading of this 1910 * protocol here. 1911 */ 1912 sc->vtnet_stats.rx_csum_bad_ipproto++; 1913 return (1); 1914 } 1915 1916 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1917 return (vtnet_rxq_csum_needs_csum(rxq, m, isipv6, protocol, 1918 hdr)); 1919 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1920 vtnet_rxq_csum_data_valid(rxq, m, protocol); 1921 1922 return (0); 1923 } 1924 #endif 1925 1926 static void 1927 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1928 { 1929 struct mbuf *m; 1930 1931 while (--nbufs > 0) { 1932 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1933 if (m == NULL) 1934 break; 1935 vtnet_rxq_discard_buf(rxq, m); 1936 } 1937 } 1938 1939 static void 1940 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1941 { 1942 int error __diagused; 1943 1944 /* 1945 * Requeue the discarded mbuf. This should always be successful 1946 * since it was just dequeued. 1947 */ 1948 error = vtnet_rxq_enqueue_buf(rxq, m); 1949 KASSERT(error == 0, 1950 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1951 } 1952 1953 static int 1954 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1955 { 1956 struct vtnet_softc *sc; 1957 struct virtqueue *vq; 1958 struct mbuf *m_tail; 1959 1960 sc = rxq->vtnrx_sc; 1961 vq = rxq->vtnrx_vq; 1962 m_tail = m_head; 1963 1964 while (--nbufs > 0) { 1965 struct mbuf *m; 1966 uint32_t len; 1967 1968 m = virtqueue_dequeue(vq, &len); 1969 if (m == NULL) { 1970 rxq->vtnrx_stats.vrxs_ierrors++; 1971 goto fail; 1972 } 1973 1974 if (vtnet_rxq_new_buf(rxq) != 0) { 1975 rxq->vtnrx_stats.vrxs_iqdrops++; 1976 vtnet_rxq_discard_buf(rxq, m); 1977 if (nbufs > 1) 1978 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1979 goto fail; 1980 } 1981 1982 if (m->m_len < len) 1983 len = m->m_len; 1984 1985 m->m_len = len; 1986 m->m_flags &= ~M_PKTHDR; 1987 1988 m_head->m_pkthdr.len += len; 1989 m_tail->m_next = m; 1990 m_tail = m; 1991 } 1992 1993 return (0); 1994 1995 fail: 1996 sc->vtnet_stats.rx_mergeable_failed++; 1997 m_freem(m_head); 1998 1999 return (1); 2000 } 2001 2002 #if defined(INET) || defined(INET6) 2003 static int 2004 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 2005 { 2006 struct lro_ctrl *lro; 2007 2008 lro = &rxq->vtnrx_lro; 2009 2010 if (lro->lro_mbuf_max != 0) { 2011 tcp_lro_queue_mbuf(lro, m); 2012 return (0); 2013 } 2014 2015 return (tcp_lro_rx(lro, m, 0)); 2016 } 2017 #endif 2018 2019 static void 2020 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2021 struct virtio_net_hdr *hdr) 2022 { 2023 struct vtnet_softc *sc; 2024 if_t ifp; 2025 2026 sc = rxq->vtnrx_sc; 2027 ifp = sc->vtnet_ifp; 2028 2029 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2030 struct ether_header *eh = mtod(m, struct ether_header *); 2031 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2032 vtnet_vlan_tag_remove(m); 2033 /* 2034 * With the 802.1Q header removed, update the 2035 * checksum starting location accordingly. 2036 */ 2037 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2038 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2039 } 2040 } 2041 2042 m->m_pkthdr.flowid = rxq->vtnrx_id; 2043 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2044 2045 if (hdr->flags & 2046 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2047 #if defined(INET) || defined(INET6) 2048 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2049 rxq->vtnrx_stats.vrxs_csum++; 2050 else 2051 rxq->vtnrx_stats.vrxs_csum_failed++; 2052 #else 2053 sc->vtnet_stats.rx_csum_bad_ethtype++; 2054 rxq->vtnrx_stats.vrxs_csum_failed++; 2055 #endif 2056 } 2057 2058 if (hdr->gso_size != 0) { 2059 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2060 case VIRTIO_NET_HDR_GSO_TCPV4: 2061 case VIRTIO_NET_HDR_GSO_TCPV6: 2062 m->m_pkthdr.lro_nsegs = 2063 howmany(m->m_pkthdr.len, hdr->gso_size); 2064 rxq->vtnrx_stats.vrxs_host_lro++; 2065 break; 2066 } 2067 } 2068 2069 rxq->vtnrx_stats.vrxs_ipackets++; 2070 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2071 2072 #if defined(INET) || defined(INET6) 2073 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2074 if (vtnet_lro_rx(rxq, m) == 0) 2075 return; 2076 } 2077 #endif 2078 2079 if_input(ifp, m); 2080 } 2081 2082 static int 2083 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2084 { 2085 struct virtio_net_hdr lhdr, *hdr; 2086 struct vtnet_softc *sc; 2087 if_t ifp; 2088 struct virtqueue *vq; 2089 int deq, count; 2090 2091 sc = rxq->vtnrx_sc; 2092 vq = rxq->vtnrx_vq; 2093 ifp = sc->vtnet_ifp; 2094 deq = 0; 2095 count = sc->vtnet_rx_process_limit; 2096 2097 VTNET_RXQ_LOCK_ASSERT(rxq); 2098 2099 CURVNET_SET(if_getvnet(ifp)); 2100 while (count-- > 0) { 2101 struct mbuf *m; 2102 uint32_t len, nbufs, adjsz; 2103 2104 m = virtqueue_dequeue(vq, &len); 2105 if (m == NULL) 2106 break; 2107 deq++; 2108 2109 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2110 rxq->vtnrx_stats.vrxs_ierrors++; 2111 vtnet_rxq_discard_buf(rxq, m); 2112 continue; 2113 } 2114 2115 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2116 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2117 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2118 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2119 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2120 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2121 } else if (vtnet_modern(sc)) { 2122 nbufs = 1; /* num_buffers is always 1 */ 2123 adjsz = sizeof(struct virtio_net_hdr_v1); 2124 } else { 2125 nbufs = 1; 2126 adjsz = sizeof(struct vtnet_rx_header); 2127 /* 2128 * Account for our gap between the header and start of 2129 * data to keep the segments separated. 2130 */ 2131 len += VTNET_RX_HEADER_PAD; 2132 } 2133 2134 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2135 rxq->vtnrx_stats.vrxs_iqdrops++; 2136 vtnet_rxq_discard_buf(rxq, m); 2137 if (nbufs > 1) 2138 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2139 continue; 2140 } 2141 2142 m->m_pkthdr.len = len; 2143 m->m_pkthdr.rcvif = ifp; 2144 m->m_pkthdr.csum_flags = 0; 2145 2146 if (nbufs > 1) { 2147 /* Dequeue the rest of chain. */ 2148 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2149 continue; 2150 } 2151 2152 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2153 2154 /* 2155 * Save an endian swapped version of the header prior to it 2156 * being stripped. The header is always at the start of the 2157 * mbuf data. num_buffers was already saved (and not needed) 2158 * so use the standard header. 2159 */ 2160 hdr = mtod(m, struct virtio_net_hdr *); 2161 lhdr.flags = hdr->flags; 2162 lhdr.gso_type = hdr->gso_type; 2163 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2164 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2165 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2166 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2167 m_adj(m, adjsz); 2168 2169 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2170 pfil_return_t pfil; 2171 2172 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2173 switch (pfil) { 2174 case PFIL_DROPPED: 2175 case PFIL_CONSUMED: 2176 continue; 2177 default: 2178 KASSERT(pfil == PFIL_PASS, 2179 ("Filter returned %d!", pfil)); 2180 } 2181 } 2182 2183 vtnet_rxq_input(rxq, m, &lhdr); 2184 } 2185 2186 if (deq > 0) { 2187 #if defined(INET) || defined(INET6) 2188 if (vtnet_software_lro(sc)) 2189 tcp_lro_flush_all(&rxq->vtnrx_lro); 2190 #endif 2191 virtqueue_notify(vq); 2192 } 2193 CURVNET_RESTORE(); 2194 2195 return (count > 0 ? 0 : EAGAIN); 2196 } 2197 2198 static void 2199 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2200 { 2201 struct vtnet_softc *sc; 2202 if_t ifp; 2203 u_int more; 2204 #ifdef DEV_NETMAP 2205 int nmirq; 2206 #endif /* DEV_NETMAP */ 2207 2208 sc = rxq->vtnrx_sc; 2209 ifp = sc->vtnet_ifp; 2210 2211 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2212 /* 2213 * Ignore this interrupt. Either this is a spurious interrupt 2214 * or multiqueue without per-VQ MSIX so every queue needs to 2215 * be polled (a brain dead configuration we could try harder 2216 * to avoid). 2217 */ 2218 vtnet_rxq_disable_intr(rxq); 2219 return; 2220 } 2221 2222 VTNET_RXQ_LOCK(rxq); 2223 2224 #ifdef DEV_NETMAP 2225 /* 2226 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2227 * This is not necessary to serialize the access to the RX vq, but 2228 * rather to avoid races that may happen if this interface is 2229 * attached to a VALE switch, which would cause received packets 2230 * to stall in the RX queue (nm_kr_tryget() could find the kring 2231 * busy when called from netmap_bwrap_intr_notify()). 2232 */ 2233 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2234 if (nmirq != NM_IRQ_PASS) { 2235 VTNET_RXQ_UNLOCK(rxq); 2236 if (nmirq == NM_IRQ_RESCHED) { 2237 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2238 } 2239 return; 2240 } 2241 #endif /* DEV_NETMAP */ 2242 2243 again: 2244 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2245 VTNET_RXQ_UNLOCK(rxq); 2246 return; 2247 } 2248 2249 more = vtnet_rxq_eof(rxq); 2250 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2251 if (!more) 2252 vtnet_rxq_disable_intr(rxq); 2253 /* 2254 * This is an occasional condition or race (when !more), 2255 * so retry a few times before scheduling the taskqueue. 2256 */ 2257 if (tries-- > 0) 2258 goto again; 2259 2260 rxq->vtnrx_stats.vrxs_rescheduled++; 2261 VTNET_RXQ_UNLOCK(rxq); 2262 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2263 } else 2264 VTNET_RXQ_UNLOCK(rxq); 2265 } 2266 2267 static void 2268 vtnet_rx_vq_intr(void *xrxq) 2269 { 2270 struct vtnet_rxq *rxq; 2271 2272 rxq = xrxq; 2273 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2274 } 2275 2276 static void 2277 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2278 { 2279 struct vtnet_rxq *rxq; 2280 2281 rxq = xrxq; 2282 vtnet_rx_vq_process(rxq, 0); 2283 } 2284 2285 static int 2286 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2287 { 2288 struct vtnet_softc *sc; 2289 int threshold; 2290 2291 sc = txq->vtntx_sc; 2292 2293 /* 2294 * The Tx interrupt is disabled until the queue free count falls 2295 * below our threshold. Completed frames are drained from the Tx 2296 * virtqueue before transmitting new frames and in the watchdog 2297 * callout, so the frequency of Tx interrupts is greatly reduced, 2298 * at the cost of not freeing mbufs as quickly as they otherwise 2299 * would be. 2300 */ 2301 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2302 2303 /* 2304 * Without indirect descriptors, leave enough room for the most 2305 * segments we handle. 2306 */ 2307 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2308 threshold < sc->vtnet_tx_nsegs) 2309 threshold = sc->vtnet_tx_nsegs; 2310 2311 return (threshold); 2312 } 2313 2314 static int 2315 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2316 { 2317 struct virtqueue *vq; 2318 2319 vq = txq->vtntx_vq; 2320 2321 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2322 } 2323 2324 static int 2325 vtnet_txq_notify(struct vtnet_txq *txq) 2326 { 2327 struct virtqueue *vq; 2328 2329 vq = txq->vtntx_vq; 2330 2331 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2332 virtqueue_notify(vq); 2333 2334 if (vtnet_txq_enable_intr(txq) == 0) 2335 return (0); 2336 2337 /* 2338 * Drain frames that were completed since last checked. If this 2339 * causes the queue to go above the threshold, the caller should 2340 * continue transmitting. 2341 */ 2342 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2343 virtqueue_disable_intr(vq); 2344 return (1); 2345 } 2346 2347 return (0); 2348 } 2349 2350 static void 2351 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2352 { 2353 struct virtqueue *vq; 2354 struct vtnet_tx_header *txhdr; 2355 int last; 2356 #ifdef DEV_NETMAP 2357 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2358 txq->vtntx_id, NR_TX); 2359 #else /* !DEV_NETMAP */ 2360 void *kring = NULL; 2361 #endif /* !DEV_NETMAP */ 2362 2363 vq = txq->vtntx_vq; 2364 last = 0; 2365 2366 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2367 if (kring == NULL) { 2368 m_freem(txhdr->vth_mbuf); 2369 uma_zfree(vtnet_tx_header_zone, txhdr); 2370 } 2371 } 2372 2373 KASSERT(virtqueue_empty(vq), 2374 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2375 } 2376 2377 /* 2378 * BMV: This can go away once we finally have offsets in the mbuf header. 2379 */ 2380 static int 2381 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2382 int *proto, int *start) 2383 { 2384 struct vtnet_softc *sc; 2385 struct ether_vlan_header *evh; 2386 #if defined(INET) || defined(INET6) 2387 int offset; 2388 #endif 2389 2390 sc = txq->vtntx_sc; 2391 2392 evh = mtod(m, struct ether_vlan_header *); 2393 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2394 /* BMV: We should handle nested VLAN tags too. */ 2395 *etype = ntohs(evh->evl_proto); 2396 #if defined(INET) || defined(INET6) 2397 offset = sizeof(struct ether_vlan_header); 2398 #endif 2399 } else { 2400 *etype = ntohs(evh->evl_encap_proto); 2401 #if defined(INET) || defined(INET6) 2402 offset = sizeof(struct ether_header); 2403 #endif 2404 } 2405 2406 switch (*etype) { 2407 #if defined(INET) 2408 case ETHERTYPE_IP: { 2409 struct ip *ip, iphdr; 2410 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2411 m_copydata(m, offset, sizeof(struct ip), 2412 (caddr_t) &iphdr); 2413 ip = &iphdr; 2414 } else 2415 ip = (struct ip *)(m->m_data + offset); 2416 *proto = ip->ip_p; 2417 *start = offset + (ip->ip_hl << 2); 2418 break; 2419 } 2420 #endif 2421 #if defined(INET6) 2422 case ETHERTYPE_IPV6: 2423 *proto = -1; 2424 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2425 /* Assert the network stack sent us a valid packet. */ 2426 KASSERT(*start > offset, 2427 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2428 *start, offset, *proto)); 2429 break; 2430 #endif 2431 default: 2432 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2433 return (EINVAL); 2434 } 2435 2436 return (0); 2437 } 2438 2439 static int 2440 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2441 int offset, struct virtio_net_hdr *hdr) 2442 { 2443 static struct timeval lastecn; 2444 static int curecn; 2445 struct vtnet_softc *sc; 2446 struct tcphdr *tcp, tcphdr; 2447 2448 sc = txq->vtntx_sc; 2449 2450 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2451 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2452 tcp = &tcphdr; 2453 } else 2454 tcp = (struct tcphdr *)(m->m_data + offset); 2455 2456 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2457 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2458 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2459 VIRTIO_NET_HDR_GSO_TCPV6; 2460 2461 if (__predict_false(tcp_get_flags(tcp) & TH_CWR)) { 2462 /* 2463 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2464 * FreeBSD, ECN support is not on a per-interface basis, 2465 * but globally via the net.inet.tcp.ecn.enable sysctl 2466 * knob. The default is off. 2467 */ 2468 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2469 if (ppsratecheck(&lastecn, &curecn, 1)) 2470 if_printf(sc->vtnet_ifp, 2471 "TSO with ECN not negotiated with host\n"); 2472 return (ENOTSUP); 2473 } 2474 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2475 } 2476 2477 txq->vtntx_stats.vtxs_tso++; 2478 2479 return (0); 2480 } 2481 2482 static struct mbuf * 2483 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2484 struct virtio_net_hdr *hdr) 2485 { 2486 struct vtnet_softc *sc; 2487 int flags, etype, csum_start, proto, error; 2488 2489 sc = txq->vtntx_sc; 2490 flags = m->m_pkthdr.csum_flags; 2491 2492 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2493 if (error) 2494 goto drop; 2495 2496 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2497 /* Sanity check the parsed mbuf matches the offload flags. */ 2498 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2499 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2500 && etype != ETHERTYPE_IPV6))) { 2501 sc->vtnet_stats.tx_csum_proto_mismatch++; 2502 goto drop; 2503 } 2504 2505 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2506 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2507 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2508 txq->vtntx_stats.vtxs_csum++; 2509 } else if ((flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) && 2510 (proto == IPPROTO_TCP || proto == IPPROTO_UDP) && 2511 (m->m_pkthdr.csum_data == 0xFFFF)) { 2512 hdr->flags |= VIRTIO_NET_HDR_F_DATA_VALID; 2513 } 2514 2515 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2516 /* 2517 * Sanity check the parsed mbuf IP protocol is TCP, and 2518 * VirtIO TSO reqires the checksum offloading above. 2519 */ 2520 if (__predict_false(proto != IPPROTO_TCP)) { 2521 sc->vtnet_stats.tx_tso_not_tcp++; 2522 goto drop; 2523 } else if (__predict_false((hdr->flags & 2524 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2525 sc->vtnet_stats.tx_tso_without_csum++; 2526 goto drop; 2527 } 2528 2529 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2530 if (error) 2531 goto drop; 2532 } 2533 2534 return (m); 2535 2536 drop: 2537 m_freem(m); 2538 return (NULL); 2539 } 2540 2541 static int 2542 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2543 struct vtnet_tx_header *txhdr) 2544 { 2545 struct vtnet_softc *sc; 2546 struct virtqueue *vq; 2547 struct sglist *sg; 2548 struct mbuf *m; 2549 int error; 2550 2551 sc = txq->vtntx_sc; 2552 vq = txq->vtntx_vq; 2553 sg = txq->vtntx_sg; 2554 m = *m_head; 2555 2556 sglist_reset(sg); 2557 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2558 if (error != 0 || sg->sg_nseg != 1) { 2559 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2560 __func__, error, sg->sg_nseg)); 2561 goto fail; 2562 } 2563 2564 error = sglist_append_mbuf(sg, m); 2565 if (error) { 2566 m = m_defrag(m, M_NOWAIT); 2567 if (m == NULL) { 2568 sc->vtnet_stats.tx_defrag_failed++; 2569 goto fail; 2570 } 2571 2572 *m_head = m; 2573 sc->vtnet_stats.tx_defragged++; 2574 2575 error = sglist_append_mbuf(sg, m); 2576 if (error) 2577 goto fail; 2578 } 2579 2580 txhdr->vth_mbuf = m; 2581 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2582 2583 return (error); 2584 2585 fail: 2586 m_freem(*m_head); 2587 *m_head = NULL; 2588 2589 return (ENOBUFS); 2590 } 2591 2592 static int 2593 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2594 { 2595 struct vtnet_tx_header *txhdr; 2596 struct virtio_net_hdr *hdr; 2597 struct mbuf *m; 2598 int error; 2599 2600 m = *m_head; 2601 M_ASSERTPKTHDR(m); 2602 2603 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2604 if (txhdr == NULL) { 2605 m_freem(m); 2606 *m_head = NULL; 2607 return (ENOMEM); 2608 } 2609 2610 /* 2611 * Always use the non-mergeable header, regardless if mergable headers 2612 * were negotiated, because for transmit num_buffers is always zero. 2613 * The vtnet_hdr_size is used to enqueue the right header size segment. 2614 */ 2615 hdr = &txhdr->vth_uhdr.hdr; 2616 2617 if (m->m_flags & M_VLANTAG) { 2618 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2619 if ((*m_head = m) == NULL) { 2620 error = ENOBUFS; 2621 goto fail; 2622 } 2623 m->m_flags &= ~M_VLANTAG; 2624 } 2625 2626 if (m->m_pkthdr.csum_flags & 2627 (VTNET_CSUM_ALL_OFFLOAD | CSUM_DATA_VALID)) { 2628 m = vtnet_txq_offload(txq, m, hdr); 2629 if ((*m_head = m) == NULL) { 2630 error = ENOBUFS; 2631 goto fail; 2632 } 2633 } 2634 2635 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2636 fail: 2637 if (error) 2638 uma_zfree(vtnet_tx_header_zone, txhdr); 2639 2640 return (error); 2641 } 2642 2643 2644 static void 2645 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2646 { 2647 struct vtnet_softc *sc; 2648 struct virtqueue *vq; 2649 struct mbuf *m0; 2650 int tries, enq; 2651 2652 sc = txq->vtntx_sc; 2653 vq = txq->vtntx_vq; 2654 tries = 0; 2655 2656 VTNET_TXQ_LOCK_ASSERT(txq); 2657 2658 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2659 sc->vtnet_link_active == 0) 2660 return; 2661 2662 vtnet_txq_eof(txq); 2663 2664 again: 2665 enq = 0; 2666 2667 while (!if_sendq_empty(ifp)) { 2668 if (virtqueue_full(vq)) 2669 break; 2670 2671 m0 = if_dequeue(ifp); 2672 if (m0 == NULL) 2673 break; 2674 2675 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2676 if (m0 != NULL) 2677 if_sendq_prepend(ifp, m0); 2678 break; 2679 } 2680 2681 enq++; 2682 ETHER_BPF_MTAP(ifp, m0); 2683 } 2684 2685 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2686 if (tries++ < VTNET_NOTIFY_RETRIES) 2687 goto again; 2688 2689 txq->vtntx_stats.vtxs_rescheduled++; 2690 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2691 } 2692 } 2693 2694 static void 2695 vtnet_start(if_t ifp) 2696 { 2697 struct vtnet_softc *sc; 2698 struct vtnet_txq *txq; 2699 2700 sc = if_getsoftc(ifp); 2701 txq = &sc->vtnet_txqs[0]; 2702 2703 VTNET_TXQ_LOCK(txq); 2704 vtnet_start_locked(txq, ifp); 2705 VTNET_TXQ_UNLOCK(txq); 2706 } 2707 2708 2709 static int 2710 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2711 { 2712 struct vtnet_softc *sc; 2713 struct virtqueue *vq; 2714 struct buf_ring *br; 2715 if_t ifp; 2716 int enq, tries, error; 2717 2718 sc = txq->vtntx_sc; 2719 vq = txq->vtntx_vq; 2720 br = txq->vtntx_br; 2721 ifp = sc->vtnet_ifp; 2722 tries = 0; 2723 error = 0; 2724 2725 VTNET_TXQ_LOCK_ASSERT(txq); 2726 2727 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2728 sc->vtnet_link_active == 0) { 2729 if (m != NULL) 2730 error = drbr_enqueue(ifp, br, m); 2731 return (error); 2732 } 2733 2734 if (m != NULL) { 2735 error = drbr_enqueue(ifp, br, m); 2736 if (error) 2737 return (error); 2738 } 2739 2740 vtnet_txq_eof(txq); 2741 2742 again: 2743 enq = 0; 2744 2745 while ((m = drbr_peek(ifp, br)) != NULL) { 2746 if (virtqueue_full(vq)) { 2747 drbr_putback(ifp, br, m); 2748 break; 2749 } 2750 2751 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2752 if (m != NULL) 2753 drbr_putback(ifp, br, m); 2754 else 2755 drbr_advance(ifp, br); 2756 break; 2757 } 2758 drbr_advance(ifp, br); 2759 2760 enq++; 2761 ETHER_BPF_MTAP(ifp, m); 2762 } 2763 2764 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2765 if (tries++ < VTNET_NOTIFY_RETRIES) 2766 goto again; 2767 2768 txq->vtntx_stats.vtxs_rescheduled++; 2769 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2770 } 2771 2772 return (0); 2773 } 2774 2775 static int 2776 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2777 { 2778 struct vtnet_softc *sc; 2779 struct vtnet_txq *txq; 2780 int i, npairs, error; 2781 2782 sc = if_getsoftc(ifp); 2783 npairs = sc->vtnet_act_vq_pairs; 2784 2785 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2786 i = m->m_pkthdr.flowid % npairs; 2787 else 2788 i = curcpu % npairs; 2789 2790 txq = &sc->vtnet_txqs[i]; 2791 2792 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2793 error = vtnet_txq_mq_start_locked(txq, m); 2794 VTNET_TXQ_UNLOCK(txq); 2795 } else { 2796 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2797 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2798 } 2799 2800 return (error); 2801 } 2802 2803 static void 2804 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2805 { 2806 struct vtnet_softc *sc; 2807 struct vtnet_txq *txq; 2808 2809 txq = xtxq; 2810 sc = txq->vtntx_sc; 2811 2812 VTNET_TXQ_LOCK(txq); 2813 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2814 vtnet_txq_mq_start_locked(txq, NULL); 2815 VTNET_TXQ_UNLOCK(txq); 2816 } 2817 2818 2819 static void 2820 vtnet_txq_start(struct vtnet_txq *txq) 2821 { 2822 struct vtnet_softc *sc; 2823 if_t ifp; 2824 2825 sc = txq->vtntx_sc; 2826 ifp = sc->vtnet_ifp; 2827 2828 if (!VTNET_ALTQ_ENABLED) { 2829 if (!drbr_empty(ifp, txq->vtntx_br)) 2830 vtnet_txq_mq_start_locked(txq, NULL); 2831 } else { 2832 if (!if_sendq_empty(ifp)) 2833 vtnet_start_locked(txq, ifp); 2834 2835 } 2836 } 2837 2838 static void 2839 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2840 { 2841 struct vtnet_softc *sc; 2842 struct vtnet_txq *txq; 2843 if_t ifp; 2844 2845 txq = xtxq; 2846 sc = txq->vtntx_sc; 2847 ifp = sc->vtnet_ifp; 2848 2849 VTNET_TXQ_LOCK(txq); 2850 2851 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2852 VTNET_TXQ_UNLOCK(txq); 2853 return; 2854 } 2855 2856 vtnet_txq_eof(txq); 2857 vtnet_txq_start(txq); 2858 2859 VTNET_TXQ_UNLOCK(txq); 2860 } 2861 2862 static int 2863 vtnet_txq_eof(struct vtnet_txq *txq) 2864 { 2865 struct virtqueue *vq; 2866 struct vtnet_tx_header *txhdr; 2867 struct mbuf *m; 2868 int deq; 2869 2870 vq = txq->vtntx_vq; 2871 deq = 0; 2872 VTNET_TXQ_LOCK_ASSERT(txq); 2873 2874 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2875 m = txhdr->vth_mbuf; 2876 deq++; 2877 2878 txq->vtntx_stats.vtxs_opackets++; 2879 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2880 if (m->m_flags & M_MCAST) 2881 txq->vtntx_stats.vtxs_omcasts++; 2882 2883 m_freem(m); 2884 uma_zfree(vtnet_tx_header_zone, txhdr); 2885 } 2886 2887 if (virtqueue_empty(vq)) 2888 txq->vtntx_watchdog = 0; 2889 2890 return (deq); 2891 } 2892 2893 static void 2894 vtnet_tx_vq_intr(void *xtxq) 2895 { 2896 struct vtnet_softc *sc; 2897 struct vtnet_txq *txq; 2898 if_t ifp; 2899 2900 txq = xtxq; 2901 sc = txq->vtntx_sc; 2902 ifp = sc->vtnet_ifp; 2903 2904 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2905 /* 2906 * Ignore this interrupt. Either this is a spurious interrupt 2907 * or multiqueue without per-VQ MSIX so every queue needs to 2908 * be polled (a brain dead configuration we could try harder 2909 * to avoid). 2910 */ 2911 vtnet_txq_disable_intr(txq); 2912 return; 2913 } 2914 2915 #ifdef DEV_NETMAP 2916 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2917 return; 2918 #endif /* DEV_NETMAP */ 2919 2920 VTNET_TXQ_LOCK(txq); 2921 2922 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2923 VTNET_TXQ_UNLOCK(txq); 2924 return; 2925 } 2926 2927 vtnet_txq_eof(txq); 2928 vtnet_txq_start(txq); 2929 2930 VTNET_TXQ_UNLOCK(txq); 2931 } 2932 2933 static void 2934 vtnet_tx_start_all(struct vtnet_softc *sc) 2935 { 2936 struct vtnet_txq *txq; 2937 int i; 2938 2939 VTNET_CORE_LOCK_ASSERT(sc); 2940 2941 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2942 txq = &sc->vtnet_txqs[i]; 2943 2944 VTNET_TXQ_LOCK(txq); 2945 vtnet_txq_start(txq); 2946 VTNET_TXQ_UNLOCK(txq); 2947 } 2948 } 2949 2950 static void 2951 vtnet_qflush(if_t ifp) 2952 { 2953 struct vtnet_softc *sc; 2954 struct vtnet_txq *txq; 2955 struct mbuf *m; 2956 int i; 2957 2958 sc = if_getsoftc(ifp); 2959 2960 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2961 txq = &sc->vtnet_txqs[i]; 2962 2963 VTNET_TXQ_LOCK(txq); 2964 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2965 m_freem(m); 2966 VTNET_TXQ_UNLOCK(txq); 2967 } 2968 2969 if_qflush(ifp); 2970 } 2971 2972 static int 2973 vtnet_watchdog(struct vtnet_txq *txq) 2974 { 2975 if_t ifp; 2976 2977 ifp = txq->vtntx_sc->vtnet_ifp; 2978 2979 VTNET_TXQ_LOCK(txq); 2980 if (txq->vtntx_watchdog == 1) { 2981 /* 2982 * Only drain completed frames if the watchdog is about to 2983 * expire. If any frames were drained, there may be enough 2984 * free descriptors now available to transmit queued frames. 2985 * In that case, the timer will immediately be decremented 2986 * below, but the timeout is generous enough that should not 2987 * be a problem. 2988 */ 2989 if (vtnet_txq_eof(txq) != 0) 2990 vtnet_txq_start(txq); 2991 } 2992 2993 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2994 VTNET_TXQ_UNLOCK(txq); 2995 return (0); 2996 } 2997 VTNET_TXQ_UNLOCK(txq); 2998 2999 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 3000 return (1); 3001 } 3002 3003 static void 3004 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 3005 struct vtnet_txq_stats *txacc) 3006 { 3007 3008 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 3009 bzero(txacc, sizeof(struct vtnet_txq_stats)); 3010 3011 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3012 struct vtnet_rxq_stats *rxst; 3013 struct vtnet_txq_stats *txst; 3014 3015 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 3016 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 3017 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 3018 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 3019 rxacc->vrxs_csum += rxst->vrxs_csum; 3020 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 3021 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 3022 3023 txst = &sc->vtnet_txqs[i].vtntx_stats; 3024 txacc->vtxs_opackets += txst->vtxs_opackets; 3025 txacc->vtxs_obytes += txst->vtxs_obytes; 3026 txacc->vtxs_csum += txst->vtxs_csum; 3027 txacc->vtxs_tso += txst->vtxs_tso; 3028 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 3029 } 3030 } 3031 3032 static uint64_t 3033 vtnet_get_counter(if_t ifp, ift_counter cnt) 3034 { 3035 struct vtnet_softc *sc; 3036 struct vtnet_rxq_stats rxaccum; 3037 struct vtnet_txq_stats txaccum; 3038 3039 sc = if_getsoftc(ifp); 3040 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3041 3042 switch (cnt) { 3043 case IFCOUNTER_IPACKETS: 3044 return (rxaccum.vrxs_ipackets); 3045 case IFCOUNTER_IQDROPS: 3046 return (rxaccum.vrxs_iqdrops); 3047 case IFCOUNTER_IERRORS: 3048 return (rxaccum.vrxs_ierrors); 3049 case IFCOUNTER_IBYTES: 3050 return (rxaccum.vrxs_ibytes); 3051 case IFCOUNTER_OPACKETS: 3052 return (txaccum.vtxs_opackets); 3053 case IFCOUNTER_OBYTES: 3054 return (txaccum.vtxs_obytes); 3055 case IFCOUNTER_OMCASTS: 3056 return (txaccum.vtxs_omcasts); 3057 default: 3058 return (if_get_counter_default(ifp, cnt)); 3059 } 3060 } 3061 3062 static void 3063 vtnet_tick(void *xsc) 3064 { 3065 struct vtnet_softc *sc; 3066 if_t ifp; 3067 int i, timedout; 3068 3069 sc = xsc; 3070 ifp = sc->vtnet_ifp; 3071 timedout = 0; 3072 3073 VTNET_CORE_LOCK_ASSERT(sc); 3074 3075 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3076 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3077 3078 if (timedout != 0) { 3079 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3080 vtnet_init_locked(sc, 0); 3081 } else 3082 callout_schedule(&sc->vtnet_tick_ch, hz); 3083 } 3084 3085 static void 3086 vtnet_start_taskqueues(struct vtnet_softc *sc) 3087 { 3088 device_t dev; 3089 struct vtnet_rxq *rxq; 3090 struct vtnet_txq *txq; 3091 int i, error; 3092 3093 dev = sc->vtnet_dev; 3094 3095 /* 3096 * Errors here are very difficult to recover from - we cannot 3097 * easily fail because, if this is during boot, we will hang 3098 * when freeing any successfully started taskqueues because 3099 * the scheduler isn't up yet. 3100 * 3101 * Most drivers just ignore the return value - it only fails 3102 * with ENOMEM so an error is not likely. 3103 */ 3104 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3105 rxq = &sc->vtnet_rxqs[i]; 3106 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3107 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3108 if (error) { 3109 device_printf(dev, "failed to start rx taskq %d\n", 3110 rxq->vtnrx_id); 3111 } 3112 3113 txq = &sc->vtnet_txqs[i]; 3114 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3115 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3116 if (error) { 3117 device_printf(dev, "failed to start tx taskq %d\n", 3118 txq->vtntx_id); 3119 } 3120 } 3121 } 3122 3123 static void 3124 vtnet_free_taskqueues(struct vtnet_softc *sc) 3125 { 3126 struct vtnet_rxq *rxq; 3127 struct vtnet_txq *txq; 3128 int i; 3129 3130 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3131 rxq = &sc->vtnet_rxqs[i]; 3132 if (rxq->vtnrx_tq != NULL) { 3133 taskqueue_free(rxq->vtnrx_tq); 3134 rxq->vtnrx_tq = NULL; 3135 } 3136 3137 txq = &sc->vtnet_txqs[i]; 3138 if (txq->vtntx_tq != NULL) { 3139 taskqueue_free(txq->vtntx_tq); 3140 txq->vtntx_tq = NULL; 3141 } 3142 } 3143 } 3144 3145 static void 3146 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3147 { 3148 struct vtnet_rxq *rxq; 3149 struct vtnet_txq *txq; 3150 int i; 3151 3152 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3153 rxq = &sc->vtnet_rxqs[i]; 3154 if (rxq->vtnrx_tq != NULL) 3155 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3156 3157 txq = &sc->vtnet_txqs[i]; 3158 if (txq->vtntx_tq != NULL) { 3159 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3160 if (!VTNET_ALTQ_ENABLED) 3161 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3162 } 3163 } 3164 } 3165 3166 static void 3167 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3168 { 3169 struct vtnet_rxq *rxq; 3170 struct vtnet_txq *txq; 3171 int i; 3172 3173 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3174 rxq = &sc->vtnet_rxqs[i]; 3175 vtnet_rxq_free_mbufs(rxq); 3176 3177 txq = &sc->vtnet_txqs[i]; 3178 vtnet_txq_free_mbufs(txq); 3179 } 3180 } 3181 3182 static void 3183 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3184 { 3185 struct vtnet_rxq *rxq; 3186 struct vtnet_txq *txq; 3187 int i; 3188 3189 VTNET_CORE_LOCK_ASSERT(sc); 3190 3191 /* 3192 * Lock and unlock the per-queue mutex so we known the stop 3193 * state is visible. Doing only the active queues should be 3194 * sufficient, but it does not cost much extra to do all the 3195 * queues. 3196 */ 3197 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3198 rxq = &sc->vtnet_rxqs[i]; 3199 VTNET_RXQ_LOCK(rxq); 3200 VTNET_RXQ_UNLOCK(rxq); 3201 3202 txq = &sc->vtnet_txqs[i]; 3203 VTNET_TXQ_LOCK(txq); 3204 VTNET_TXQ_UNLOCK(txq); 3205 } 3206 } 3207 3208 static void 3209 vtnet_stop(struct vtnet_softc *sc) 3210 { 3211 device_t dev; 3212 if_t ifp; 3213 3214 dev = sc->vtnet_dev; 3215 ifp = sc->vtnet_ifp; 3216 3217 VTNET_CORE_LOCK_ASSERT(sc); 3218 3219 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3220 sc->vtnet_link_active = 0; 3221 callout_stop(&sc->vtnet_tick_ch); 3222 3223 /* Only advisory. */ 3224 vtnet_disable_interrupts(sc); 3225 3226 #ifdef DEV_NETMAP 3227 /* Stop any pending txsync/rxsync and disable them. */ 3228 netmap_disable_all_rings(ifp); 3229 #endif /* DEV_NETMAP */ 3230 3231 /* 3232 * Stop the host adapter. This resets it to the pre-initialized 3233 * state. It will not generate any interrupts until after it is 3234 * reinitialized. 3235 */ 3236 virtio_stop(dev); 3237 vtnet_stop_rendezvous(sc); 3238 3239 vtnet_drain_rxtx_queues(sc); 3240 sc->vtnet_act_vq_pairs = 1; 3241 } 3242 3243 static int 3244 vtnet_virtio_reinit(struct vtnet_softc *sc) 3245 { 3246 device_t dev; 3247 if_t ifp; 3248 uint64_t features; 3249 int error; 3250 3251 dev = sc->vtnet_dev; 3252 ifp = sc->vtnet_ifp; 3253 features = sc->vtnet_negotiated_features; 3254 3255 /* 3256 * Re-negotiate with the host, removing any disabled receive 3257 * features. Transmit features are disabled only on our side 3258 * via if_capenable and if_hwassist. 3259 */ 3260 3261 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3262 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3263 3264 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3265 features &= ~VTNET_LRO_FEATURES; 3266 3267 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3268 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3269 3270 error = virtio_reinit(dev, features); 3271 if (error) { 3272 device_printf(dev, "virtio reinit error %d\n", error); 3273 return (error); 3274 } 3275 3276 sc->vtnet_features = features; 3277 virtio_reinit_complete(dev); 3278 3279 return (0); 3280 } 3281 3282 static void 3283 vtnet_init_rx_filters(struct vtnet_softc *sc) 3284 { 3285 if_t ifp; 3286 3287 ifp = sc->vtnet_ifp; 3288 3289 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3290 vtnet_rx_filter(sc); 3291 vtnet_rx_filter_mac(sc); 3292 } 3293 3294 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3295 vtnet_rx_filter_vlan(sc); 3296 } 3297 3298 static int 3299 vtnet_init_rx_queues(struct vtnet_softc *sc) 3300 { 3301 device_t dev; 3302 if_t ifp; 3303 struct vtnet_rxq *rxq; 3304 int i, clustersz, error; 3305 3306 dev = sc->vtnet_dev; 3307 ifp = sc->vtnet_ifp; 3308 3309 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3310 sc->vtnet_rx_clustersz = clustersz; 3311 3312 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3313 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3314 VTNET_MAX_RX_SIZE, clustersz); 3315 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3316 ("%s: too many rx mbufs %d for %d segments", __func__, 3317 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3318 } else 3319 sc->vtnet_rx_nmbufs = 1; 3320 3321 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3322 rxq = &sc->vtnet_rxqs[i]; 3323 3324 /* Hold the lock to satisfy asserts. */ 3325 VTNET_RXQ_LOCK(rxq); 3326 error = vtnet_rxq_populate(rxq); 3327 VTNET_RXQ_UNLOCK(rxq); 3328 3329 if (error) { 3330 device_printf(dev, "cannot populate Rx queue %d\n", i); 3331 return (error); 3332 } 3333 } 3334 3335 return (0); 3336 } 3337 3338 static int 3339 vtnet_init_tx_queues(struct vtnet_softc *sc) 3340 { 3341 struct vtnet_txq *txq; 3342 int i; 3343 3344 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3345 txq = &sc->vtnet_txqs[i]; 3346 txq->vtntx_watchdog = 0; 3347 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3348 #ifdef DEV_NETMAP 3349 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3350 #endif /* DEV_NETMAP */ 3351 } 3352 3353 return (0); 3354 } 3355 3356 static int 3357 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3358 { 3359 int error; 3360 3361 error = vtnet_init_rx_queues(sc); 3362 if (error) 3363 return (error); 3364 3365 error = vtnet_init_tx_queues(sc); 3366 if (error) 3367 return (error); 3368 3369 return (0); 3370 } 3371 3372 static void 3373 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3374 { 3375 device_t dev; 3376 int npairs; 3377 3378 dev = sc->vtnet_dev; 3379 3380 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3381 sc->vtnet_act_vq_pairs = 1; 3382 return; 3383 } 3384 3385 npairs = sc->vtnet_req_vq_pairs; 3386 3387 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3388 device_printf(dev, "cannot set active queue pairs to %d, " 3389 "falling back to 1 queue pair\n", npairs); 3390 npairs = 1; 3391 } 3392 3393 sc->vtnet_act_vq_pairs = npairs; 3394 } 3395 3396 static void 3397 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3398 { 3399 if_t ifp; 3400 uint64_t features; 3401 int error; 3402 3403 ifp = sc->vtnet_ifp; 3404 features = sc->vtnet_features; 3405 3406 VTNET_CORE_LOCK_ASSERT(sc); 3407 3408 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3409 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3410 features |= VIRTIO_NET_F_GUEST_CSUM; 3411 else 3412 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3413 } 3414 3415 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3416 if (if_getcapenable(ifp) & IFCAP_LRO) 3417 features |= VTNET_LRO_FEATURES; 3418 else 3419 features &= ~VTNET_LRO_FEATURES; 3420 } 3421 3422 error = vtnet_ctrl_guest_offloads(sc, 3423 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3424 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3425 VIRTIO_NET_F_GUEST_UFO)); 3426 if (error) { 3427 device_printf(sc->vtnet_dev, 3428 "%s: cannot update Rx features\n", __func__); 3429 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3430 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3431 vtnet_init_locked(sc, 0); 3432 } 3433 } else 3434 sc->vtnet_features = features; 3435 } 3436 3437 static int 3438 vtnet_reinit(struct vtnet_softc *sc) 3439 { 3440 if_t ifp; 3441 int error; 3442 3443 ifp = sc->vtnet_ifp; 3444 3445 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3446 3447 error = vtnet_virtio_reinit(sc); 3448 if (error) 3449 return (error); 3450 3451 vtnet_set_macaddr(sc); 3452 vtnet_set_active_vq_pairs(sc); 3453 3454 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3455 vtnet_init_rx_filters(sc); 3456 3457 if_sethwassist(ifp, 0); 3458 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3459 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3460 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3461 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3462 if (if_getcapenable(ifp) & IFCAP_TSO4) 3463 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3464 if (if_getcapenable(ifp) & IFCAP_TSO6) 3465 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3466 3467 error = vtnet_init_rxtx_queues(sc); 3468 if (error) 3469 return (error); 3470 3471 return (0); 3472 } 3473 3474 static void 3475 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3476 { 3477 if_t ifp; 3478 3479 ifp = sc->vtnet_ifp; 3480 3481 VTNET_CORE_LOCK_ASSERT(sc); 3482 3483 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3484 return; 3485 3486 vtnet_stop(sc); 3487 3488 #ifdef DEV_NETMAP 3489 /* Once stopped we can update the netmap flags, if necessary. */ 3490 switch (init_mode) { 3491 case VTNET_INIT_NETMAP_ENTER: 3492 nm_set_native_flags(NA(ifp)); 3493 break; 3494 case VTNET_INIT_NETMAP_EXIT: 3495 nm_clear_native_flags(NA(ifp)); 3496 break; 3497 } 3498 #endif /* DEV_NETMAP */ 3499 3500 if (vtnet_reinit(sc) != 0) { 3501 vtnet_stop(sc); 3502 return; 3503 } 3504 3505 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3506 vtnet_update_link_status(sc); 3507 vtnet_enable_interrupts(sc); 3508 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3509 3510 #ifdef DEV_NETMAP 3511 /* Re-enable txsync/rxsync. */ 3512 netmap_enable_all_rings(ifp); 3513 #endif /* DEV_NETMAP */ 3514 } 3515 3516 static void 3517 vtnet_init(void *xsc) 3518 { 3519 struct vtnet_softc *sc; 3520 3521 sc = xsc; 3522 3523 VTNET_CORE_LOCK(sc); 3524 vtnet_init_locked(sc, 0); 3525 VTNET_CORE_UNLOCK(sc); 3526 } 3527 3528 static void 3529 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3530 { 3531 3532 /* 3533 * The control virtqueue is only polled and therefore it should 3534 * already be empty. 3535 */ 3536 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3537 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3538 } 3539 3540 static void 3541 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3542 struct sglist *sg, int readable, int writable) 3543 { 3544 struct virtqueue *vq; 3545 3546 vq = sc->vtnet_ctrl_vq; 3547 3548 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3549 VTNET_CORE_LOCK_ASSERT(sc); 3550 3551 if (!virtqueue_empty(vq)) 3552 return; 3553 3554 /* 3555 * Poll for the response, but the command is likely completed before 3556 * returning from the notify. 3557 */ 3558 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3559 virtqueue_notify(vq); 3560 virtqueue_poll(vq, NULL); 3561 } 3562 } 3563 3564 static int 3565 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3566 { 3567 struct sglist_seg segs[3]; 3568 struct sglist sg; 3569 struct { 3570 struct virtio_net_ctrl_hdr hdr __aligned(2); 3571 uint8_t pad1; 3572 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3573 uint8_t pad2; 3574 uint8_t ack; 3575 } s; 3576 int error; 3577 3578 error = 0; 3579 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3580 3581 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3582 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3583 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3584 s.ack = VIRTIO_NET_ERR; 3585 3586 sglist_init(&sg, nitems(segs), segs); 3587 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3588 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3589 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3590 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3591 3592 if (error == 0) 3593 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3594 3595 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3596 } 3597 3598 static int 3599 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3600 { 3601 struct sglist_seg segs[3]; 3602 struct sglist sg; 3603 struct { 3604 struct virtio_net_ctrl_hdr hdr __aligned(2); 3605 uint8_t pad1; 3606 uint64_t offloads __aligned(8); 3607 uint8_t pad2; 3608 uint8_t ack; 3609 } s; 3610 int error; 3611 3612 error = 0; 3613 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3614 3615 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3616 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3617 s.offloads = vtnet_gtoh64(sc, offloads); 3618 s.ack = VIRTIO_NET_ERR; 3619 3620 sglist_init(&sg, nitems(segs), segs); 3621 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3622 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3623 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3624 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3625 3626 if (error == 0) 3627 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3628 3629 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3630 } 3631 3632 static int 3633 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3634 { 3635 struct sglist_seg segs[3]; 3636 struct sglist sg; 3637 struct { 3638 struct virtio_net_ctrl_hdr hdr __aligned(2); 3639 uint8_t pad1; 3640 struct virtio_net_ctrl_mq mq __aligned(2); 3641 uint8_t pad2; 3642 uint8_t ack; 3643 } s; 3644 int error; 3645 3646 error = 0; 3647 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3648 3649 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3650 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3651 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3652 s.ack = VIRTIO_NET_ERR; 3653 3654 sglist_init(&sg, nitems(segs), segs); 3655 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3656 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3657 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3658 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3659 3660 if (error == 0) 3661 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3662 3663 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3664 } 3665 3666 static int 3667 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3668 { 3669 struct sglist_seg segs[3]; 3670 struct sglist sg; 3671 struct { 3672 struct virtio_net_ctrl_hdr hdr __aligned(2); 3673 uint8_t pad1; 3674 uint8_t onoff; 3675 uint8_t pad2; 3676 uint8_t ack; 3677 } s; 3678 int error; 3679 3680 error = 0; 3681 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3682 3683 s.hdr.class = VIRTIO_NET_CTRL_RX; 3684 s.hdr.cmd = cmd; 3685 s.onoff = on; 3686 s.ack = VIRTIO_NET_ERR; 3687 3688 sglist_init(&sg, nitems(segs), segs); 3689 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3690 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3691 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3692 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3693 3694 if (error == 0) 3695 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3696 3697 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3698 } 3699 3700 static int 3701 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3702 { 3703 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3704 } 3705 3706 static int 3707 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3708 { 3709 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3710 } 3711 3712 static void 3713 vtnet_rx_filter(struct vtnet_softc *sc) 3714 { 3715 device_t dev; 3716 if_t ifp; 3717 3718 dev = sc->vtnet_dev; 3719 ifp = sc->vtnet_ifp; 3720 3721 VTNET_CORE_LOCK_ASSERT(sc); 3722 3723 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3724 device_printf(dev, "cannot %s promiscuous mode\n", 3725 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3726 } 3727 3728 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3729 device_printf(dev, "cannot %s all-multicast mode\n", 3730 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3731 } 3732 } 3733 3734 static u_int 3735 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3736 { 3737 struct vtnet_softc *sc = arg; 3738 3739 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3740 return (0); 3741 3742 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3743 bcopy(LLADDR(sdl), 3744 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3745 ETHER_ADDR_LEN); 3746 3747 return (1); 3748 } 3749 3750 static u_int 3751 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3752 { 3753 struct vtnet_mac_filter *filter = arg; 3754 3755 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3756 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3757 ETHER_ADDR_LEN); 3758 3759 return (1); 3760 } 3761 3762 static void 3763 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3764 { 3765 struct virtio_net_ctrl_hdr hdr __aligned(2); 3766 struct vtnet_mac_filter *filter; 3767 struct sglist_seg segs[4]; 3768 struct sglist sg; 3769 if_t ifp; 3770 bool promisc, allmulti; 3771 u_int ucnt, mcnt; 3772 int error; 3773 uint8_t ack; 3774 3775 ifp = sc->vtnet_ifp; 3776 filter = sc->vtnet_mac_filter; 3777 error = 0; 3778 3779 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3780 VTNET_CORE_LOCK_ASSERT(sc); 3781 3782 /* Unicast MAC addresses: */ 3783 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3784 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3785 3786 if (promisc) { 3787 ucnt = 0; 3788 if_printf(ifp, "more than %d MAC addresses assigned, " 3789 "falling back to promiscuous mode\n", 3790 VTNET_MAX_MAC_ENTRIES); 3791 } 3792 3793 /* Multicast MAC addresses: */ 3794 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3795 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3796 3797 if (allmulti) { 3798 mcnt = 0; 3799 if_printf(ifp, "more than %d multicast MAC addresses " 3800 "assigned, falling back to all-multicast mode\n", 3801 VTNET_MAX_MAC_ENTRIES); 3802 } 3803 3804 if (promisc && allmulti) 3805 goto out; 3806 3807 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3808 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3809 3810 hdr.class = VIRTIO_NET_CTRL_MAC; 3811 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3812 ack = VIRTIO_NET_ERR; 3813 3814 sglist_init(&sg, nitems(segs), segs); 3815 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3816 error |= sglist_append(&sg, &filter->vmf_unicast, 3817 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3818 error |= sglist_append(&sg, &filter->vmf_multicast, 3819 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3820 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3821 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3822 3823 if (error == 0) 3824 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3825 if (ack != VIRTIO_NET_OK) 3826 if_printf(ifp, "error setting host MAC filter table\n"); 3827 3828 out: 3829 if (promisc && vtnet_set_promisc(sc, true) != 0) 3830 if_printf(ifp, "cannot enable promiscuous mode\n"); 3831 if (allmulti && vtnet_set_allmulti(sc, true) != 0) 3832 if_printf(ifp, "cannot enable all-multicast mode\n"); 3833 } 3834 3835 static int 3836 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3837 { 3838 struct sglist_seg segs[3]; 3839 struct sglist sg; 3840 struct { 3841 struct virtio_net_ctrl_hdr hdr __aligned(2); 3842 uint8_t pad1; 3843 uint16_t tag __aligned(2); 3844 uint8_t pad2; 3845 uint8_t ack; 3846 } s; 3847 int error; 3848 3849 error = 0; 3850 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3851 3852 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3853 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3854 s.tag = vtnet_gtoh16(sc, tag); 3855 s.ack = VIRTIO_NET_ERR; 3856 3857 sglist_init(&sg, nitems(segs), segs); 3858 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3859 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3860 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3861 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3862 3863 if (error == 0) 3864 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3865 3866 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3867 } 3868 3869 static void 3870 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3871 { 3872 int i, bit; 3873 uint32_t w; 3874 uint16_t tag; 3875 3876 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3877 VTNET_CORE_LOCK_ASSERT(sc); 3878 3879 /* Enable the filter for each configured VLAN. */ 3880 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3881 w = sc->vtnet_vlan_filter[i]; 3882 3883 while ((bit = ffs(w) - 1) != -1) { 3884 w &= ~(1 << bit); 3885 tag = sizeof(w) * CHAR_BIT * i + bit; 3886 3887 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3888 device_printf(sc->vtnet_dev, 3889 "cannot enable VLAN %d filter\n", tag); 3890 } 3891 } 3892 } 3893 } 3894 3895 static void 3896 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3897 { 3898 if_t ifp; 3899 int idx, bit; 3900 3901 ifp = sc->vtnet_ifp; 3902 idx = (tag >> 5) & 0x7F; 3903 bit = tag & 0x1F; 3904 3905 if (tag == 0 || tag > 4095) 3906 return; 3907 3908 VTNET_CORE_LOCK(sc); 3909 3910 if (add) 3911 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3912 else 3913 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3914 3915 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3916 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3917 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3918 device_printf(sc->vtnet_dev, 3919 "cannot %s VLAN %d %s the host filter table\n", 3920 add ? "add" : "remove", tag, add ? "to" : "from"); 3921 } 3922 3923 VTNET_CORE_UNLOCK(sc); 3924 } 3925 3926 static void 3927 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3928 { 3929 3930 if (if_getsoftc(ifp) != arg) 3931 return; 3932 3933 vtnet_update_vlan_filter(arg, 1, tag); 3934 } 3935 3936 static void 3937 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3938 { 3939 3940 if (if_getsoftc(ifp) != arg) 3941 return; 3942 3943 vtnet_update_vlan_filter(arg, 0, tag); 3944 } 3945 3946 static void 3947 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3948 { 3949 if_t ifp; 3950 uint32_t speed; 3951 3952 ifp = sc->vtnet_ifp; 3953 3954 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3955 return; 3956 3957 /* BMV: Ignore duplex. */ 3958 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3959 offsetof(struct virtio_net_config, speed)); 3960 if (speed != UINT32_MAX) 3961 if_setbaudrate(ifp, IF_Mbps(speed)); 3962 } 3963 3964 static int 3965 vtnet_is_link_up(struct vtnet_softc *sc) 3966 { 3967 uint16_t status; 3968 3969 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3970 return (1); 3971 3972 status = virtio_read_dev_config_2(sc->vtnet_dev, 3973 offsetof(struct virtio_net_config, status)); 3974 3975 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3976 } 3977 3978 static void 3979 vtnet_update_link_status(struct vtnet_softc *sc) 3980 { 3981 if_t ifp; 3982 int link; 3983 3984 ifp = sc->vtnet_ifp; 3985 VTNET_CORE_LOCK_ASSERT(sc); 3986 link = vtnet_is_link_up(sc); 3987 3988 /* Notify if the link status has changed. */ 3989 if (link != 0 && sc->vtnet_link_active == 0) { 3990 vtnet_update_speed_duplex(sc); 3991 sc->vtnet_link_active = 1; 3992 if_link_state_change(ifp, LINK_STATE_UP); 3993 } else if (link == 0 && sc->vtnet_link_active != 0) { 3994 sc->vtnet_link_active = 0; 3995 if_link_state_change(ifp, LINK_STATE_DOWN); 3996 } 3997 } 3998 3999 static int 4000 vtnet_ifmedia_upd(if_t ifp __unused) 4001 { 4002 return (EOPNOTSUPP); 4003 } 4004 4005 static void 4006 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 4007 { 4008 struct vtnet_softc *sc; 4009 4010 sc = if_getsoftc(ifp); 4011 4012 ifmr->ifm_status = IFM_AVALID; 4013 ifmr->ifm_active = IFM_ETHER; 4014 4015 VTNET_CORE_LOCK(sc); 4016 if (vtnet_is_link_up(sc) != 0) { 4017 ifmr->ifm_status |= IFM_ACTIVE; 4018 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 4019 } else 4020 ifmr->ifm_active |= IFM_NONE; 4021 VTNET_CORE_UNLOCK(sc); 4022 } 4023 4024 static void 4025 vtnet_get_macaddr(struct vtnet_softc *sc) 4026 { 4027 4028 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 4029 virtio_read_device_config_array(sc->vtnet_dev, 4030 offsetof(struct virtio_net_config, mac), 4031 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4032 } else { 4033 /* Generate a random locally administered unicast address. */ 4034 sc->vtnet_hwaddr[0] = 0xB2; 4035 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4036 } 4037 } 4038 4039 static void 4040 vtnet_set_macaddr(struct vtnet_softc *sc) 4041 { 4042 device_t dev; 4043 int error; 4044 4045 dev = sc->vtnet_dev; 4046 4047 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4048 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4049 if (error) 4050 device_printf(dev, "unable to set MAC address\n"); 4051 return; 4052 } 4053 4054 /* MAC in config is read-only in modern VirtIO. */ 4055 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4056 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4057 virtio_write_dev_config_1(dev, 4058 offsetof(struct virtio_net_config, mac) + i, 4059 sc->vtnet_hwaddr[i]); 4060 } 4061 } 4062 } 4063 4064 static void 4065 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4066 { 4067 4068 /* Assign MAC address if it was generated. */ 4069 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4070 vtnet_set_macaddr(sc); 4071 } 4072 4073 static void 4074 vtnet_vlan_tag_remove(struct mbuf *m) 4075 { 4076 struct ether_vlan_header *evh; 4077 4078 evh = mtod(m, struct ether_vlan_header *); 4079 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4080 m->m_flags |= M_VLANTAG; 4081 4082 /* Strip the 802.1Q header. */ 4083 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4084 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4085 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4086 } 4087 4088 static void 4089 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4090 { 4091 int limit; 4092 4093 limit = vtnet_tunable_int(sc, "rx_process_limit", 4094 vtnet_rx_process_limit); 4095 if (limit < 0) 4096 limit = INT_MAX; 4097 sc->vtnet_rx_process_limit = limit; 4098 } 4099 4100 static void 4101 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4102 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4103 { 4104 struct sysctl_oid *node; 4105 struct sysctl_oid_list *list; 4106 struct vtnet_rxq_stats *stats; 4107 char namebuf[16]; 4108 4109 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4110 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4111 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4112 list = SYSCTL_CHILDREN(node); 4113 4114 stats = &rxq->vtnrx_stats; 4115 4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", 4117 CTLFLAG_RD | CTLFLAG_STATS, 4118 &stats->vrxs_ipackets, "Receive packets"); 4119 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", 4120 CTLFLAG_RD | CTLFLAG_STATS, 4121 &stats->vrxs_ibytes, "Receive bytes"); 4122 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", 4123 CTLFLAG_RD | CTLFLAG_STATS, 4124 &stats->vrxs_iqdrops, "Receive drops"); 4125 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", 4126 CTLFLAG_RD | CTLFLAG_STATS, 4127 &stats->vrxs_ierrors, "Receive errors"); 4128 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", 4129 CTLFLAG_RD | CTLFLAG_STATS, 4130 &stats->vrxs_csum, "Receive checksum offloaded"); 4131 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", 4132 CTLFLAG_RD | CTLFLAG_STATS, 4133 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4134 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", 4135 CTLFLAG_RD | CTLFLAG_STATS, 4136 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4137 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", 4138 CTLFLAG_RD | CTLFLAG_STATS, 4139 &stats->vrxs_rescheduled, 4140 "Receive interrupt handler rescheduled"); 4141 } 4142 4143 static void 4144 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4145 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4146 { 4147 struct sysctl_oid *node; 4148 struct sysctl_oid_list *list; 4149 struct vtnet_txq_stats *stats; 4150 char namebuf[16]; 4151 4152 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4153 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4154 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4155 list = SYSCTL_CHILDREN(node); 4156 4157 stats = &txq->vtntx_stats; 4158 4159 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", 4160 CTLFLAG_RD | CTLFLAG_STATS, 4161 &stats->vtxs_opackets, "Transmit packets"); 4162 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", 4163 CTLFLAG_RD | CTLFLAG_STATS, 4164 &stats->vtxs_obytes, "Transmit bytes"); 4165 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", 4166 CTLFLAG_RD | CTLFLAG_STATS, 4167 &stats->vtxs_omcasts, "Transmit multicasts"); 4168 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", 4169 CTLFLAG_RD | CTLFLAG_STATS, 4170 &stats->vtxs_csum, "Transmit checksum offloaded"); 4171 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", 4172 CTLFLAG_RD | CTLFLAG_STATS, 4173 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4174 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", 4175 CTLFLAG_RD | CTLFLAG_STATS, 4176 &stats->vtxs_rescheduled, 4177 "Transmit interrupt handler rescheduled"); 4178 } 4179 4180 static void 4181 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4182 { 4183 device_t dev; 4184 struct sysctl_ctx_list *ctx; 4185 struct sysctl_oid *tree; 4186 struct sysctl_oid_list *child; 4187 int i; 4188 4189 dev = sc->vtnet_dev; 4190 ctx = device_get_sysctl_ctx(dev); 4191 tree = device_get_sysctl_tree(dev); 4192 child = SYSCTL_CHILDREN(tree); 4193 4194 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4195 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4196 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4197 } 4198 } 4199 4200 static int 4201 vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS) 4202 { 4203 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4204 struct vtnet_statistics *stats = &sc->vtnet_stats; 4205 struct vtnet_rxq_stats *rxst; 4206 int i; 4207 4208 stats->rx_csum_failed = 0; 4209 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4210 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4211 stats->rx_csum_failed += rxst->vrxs_csum_failed; 4212 } 4213 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_failed, req)); 4214 } 4215 4216 static int 4217 vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS) 4218 { 4219 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4220 struct vtnet_statistics *stats = &sc->vtnet_stats; 4221 struct vtnet_rxq_stats *rxst; 4222 int i; 4223 4224 stats->rx_csum_offloaded = 0; 4225 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4226 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4227 stats->rx_csum_offloaded += rxst->vrxs_csum; 4228 } 4229 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_offloaded, req)); 4230 } 4231 4232 static int 4233 vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS) 4234 { 4235 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4236 struct vtnet_statistics *stats = &sc->vtnet_stats; 4237 struct vtnet_rxq_stats *rxst; 4238 int i; 4239 4240 stats->rx_task_rescheduled = 0; 4241 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4242 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4243 stats->rx_task_rescheduled += rxst->vrxs_rescheduled; 4244 } 4245 return (sysctl_handle_64(oidp, NULL, stats->rx_task_rescheduled, req)); 4246 } 4247 4248 static int 4249 vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS) 4250 { 4251 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4252 struct vtnet_statistics *stats = &sc->vtnet_stats; 4253 struct vtnet_txq_stats *txst; 4254 int i; 4255 4256 stats->tx_csum_offloaded = 0; 4257 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4258 txst = &sc->vtnet_txqs[i].vtntx_stats; 4259 stats->tx_csum_offloaded += txst->vtxs_csum; 4260 } 4261 return (sysctl_handle_64(oidp, NULL, stats->tx_csum_offloaded, req)); 4262 } 4263 4264 static int 4265 vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS) 4266 { 4267 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4268 struct vtnet_statistics *stats = &sc->vtnet_stats; 4269 struct vtnet_txq_stats *txst; 4270 int i; 4271 4272 stats->tx_tso_offloaded = 0; 4273 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4274 txst = &sc->vtnet_txqs[i].vtntx_stats; 4275 stats->tx_tso_offloaded += txst->vtxs_tso; 4276 } 4277 return (sysctl_handle_64(oidp, NULL, stats->tx_tso_offloaded, req)); 4278 } 4279 4280 static int 4281 vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS) 4282 { 4283 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4284 struct vtnet_statistics *stats = &sc->vtnet_stats; 4285 struct vtnet_txq_stats *txst; 4286 int i; 4287 4288 stats->tx_task_rescheduled = 0; 4289 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4290 txst = &sc->vtnet_txqs[i].vtntx_stats; 4291 stats->tx_task_rescheduled += txst->vtxs_rescheduled; 4292 } 4293 return (sysctl_handle_64(oidp, NULL, stats->tx_task_rescheduled, req)); 4294 } 4295 4296 static void 4297 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4298 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4299 { 4300 struct vtnet_statistics *stats; 4301 struct vtnet_rxq_stats rxaccum; 4302 struct vtnet_txq_stats txaccum; 4303 4304 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4305 4306 stats = &sc->vtnet_stats; 4307 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4308 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4309 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4310 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4311 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4312 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4313 4314 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4315 CTLFLAG_RD | CTLFLAG_STATS, &stats->mbuf_alloc_failed, 4316 "Mbuf cluster allocation failures"); 4317 4318 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4319 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_frame_too_large, 4320 "Received frame larger than the mbuf chain"); 4321 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4322 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_enq_replacement_failed, 4323 "Enqueuing the replacement receive mbuf failed"); 4324 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4325 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_mergeable_failed, 4326 "Mergeable buffers receive failures"); 4327 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4328 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ethtype, 4329 "Received checksum offloaded buffer with unsupported " 4330 "Ethernet type"); 4331 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4332 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ipproto, 4333 "Received checksum offloaded buffer with incorrect IP protocol"); 4334 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4335 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_offset, 4336 "Received checksum offloaded buffer with incorrect offset"); 4337 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_inaccessible_ipproto", 4338 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_inaccessible_ipproto, 4339 "Received checksum offloaded buffer with inaccessible IP protocol"); 4340 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_failed", 4341 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4342 sc, 0, vtnet_sysctl_rx_csum_failed, "QU", 4343 "Received buffer checksum offload failed"); 4344 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_offloaded", 4345 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4346 sc, 0, vtnet_sysctl_rx_csum_offloaded, "QU", 4347 "Received buffer checksum offload succeeded"); 4348 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_task_rescheduled", 4349 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4350 sc, 0, vtnet_sysctl_rx_task_rescheduled, "QU", 4351 "Times the receive interrupt task rescheduled itself"); 4352 4353 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4354 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_unknown_ethtype, 4355 "Aborted transmit of checksum offloaded buffer with unknown " 4356 "Ethernet type"); 4357 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4358 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_proto_mismatch, 4359 "Aborted transmit of checksum offloaded buffer because mismatched " 4360 "protocols"); 4361 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4362 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_not_tcp, 4363 "Aborted transmit of TSO buffer with non TCP protocol"); 4364 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4365 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_without_csum, 4366 "Aborted transmit of TSO buffer without TCP checksum offload"); 4367 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4368 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defragged, 4369 "Transmit mbufs defragged"); 4370 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4371 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defrag_failed, 4372 "Aborted transmit of buffer because defrag failed"); 4373 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_csum_offloaded", 4374 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4375 sc, 0, vtnet_sysctl_tx_csum_offloaded, "QU", 4376 "Offloaded checksum of transmitted buffer"); 4377 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_tso_offloaded", 4378 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4379 sc, 0, vtnet_sysctl_tx_tso_offloaded, "QU", 4380 "Segmentation offload of transmitted buffer"); 4381 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_task_rescheduled", 4382 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4383 sc, 0, vtnet_sysctl_tx_task_rescheduled, "QU", 4384 "Times the transmit interrupt task rescheduled itself"); 4385 } 4386 4387 static void 4388 vtnet_setup_sysctl(struct vtnet_softc *sc) 4389 { 4390 device_t dev; 4391 struct sysctl_ctx_list *ctx; 4392 struct sysctl_oid *tree; 4393 struct sysctl_oid_list *child; 4394 4395 dev = sc->vtnet_dev; 4396 ctx = device_get_sysctl_ctx(dev); 4397 tree = device_get_sysctl_tree(dev); 4398 child = SYSCTL_CHILDREN(tree); 4399 4400 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4401 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4402 "Number of maximum supported virtqueue pairs"); 4403 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4404 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4405 "Number of requested virtqueue pairs"); 4406 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4407 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4408 "Number of active virtqueue pairs"); 4409 4410 vtnet_setup_stat_sysctl(ctx, child, sc); 4411 } 4412 4413 static void 4414 vtnet_load_tunables(struct vtnet_softc *sc) 4415 { 4416 4417 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4418 "lro_entry_count", vtnet_lro_entry_count); 4419 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4420 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4421 4422 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4423 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4424 } 4425 4426 static int 4427 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4428 { 4429 4430 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4431 } 4432 4433 static void 4434 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4435 { 4436 4437 virtqueue_disable_intr(rxq->vtnrx_vq); 4438 } 4439 4440 static int 4441 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4442 { 4443 struct virtqueue *vq; 4444 4445 vq = txq->vtntx_vq; 4446 4447 if (vtnet_txq_below_threshold(txq) != 0) 4448 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4449 4450 /* 4451 * The free count is above our threshold. Keep the Tx interrupt 4452 * disabled until the queue is fuller. 4453 */ 4454 return (0); 4455 } 4456 4457 static void 4458 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4459 { 4460 4461 virtqueue_disable_intr(txq->vtntx_vq); 4462 } 4463 4464 static void 4465 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4466 { 4467 struct vtnet_rxq *rxq; 4468 int i; 4469 4470 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4471 rxq = &sc->vtnet_rxqs[i]; 4472 if (vtnet_rxq_enable_intr(rxq) != 0) 4473 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4474 } 4475 } 4476 4477 static void 4478 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4479 { 4480 int i; 4481 4482 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4483 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4484 } 4485 4486 static void 4487 vtnet_enable_interrupts(struct vtnet_softc *sc) 4488 { 4489 4490 vtnet_enable_rx_interrupts(sc); 4491 vtnet_enable_tx_interrupts(sc); 4492 } 4493 4494 static void 4495 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4496 { 4497 int i; 4498 4499 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4500 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4501 } 4502 4503 static void 4504 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4505 { 4506 int i; 4507 4508 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4509 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4510 } 4511 4512 static void 4513 vtnet_disable_interrupts(struct vtnet_softc *sc) 4514 { 4515 4516 vtnet_disable_rx_interrupts(sc); 4517 vtnet_disable_tx_interrupts(sc); 4518 } 4519 4520 static int 4521 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4522 { 4523 char path[64]; 4524 4525 snprintf(path, sizeof(path), 4526 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4527 TUNABLE_INT_FETCH(path, &def); 4528 4529 return (def); 4530 } 4531 4532 #ifdef DEBUGNET 4533 static void 4534 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4535 { 4536 struct vtnet_softc *sc; 4537 4538 sc = if_getsoftc(ifp); 4539 4540 VTNET_CORE_LOCK(sc); 4541 *nrxr = sc->vtnet_req_vq_pairs; 4542 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4543 *clsize = sc->vtnet_rx_clustersz; 4544 VTNET_CORE_UNLOCK(sc); 4545 } 4546 4547 static void 4548 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4549 { 4550 struct vtnet_softc *sc; 4551 static bool sw_lro_enabled = false; 4552 4553 /* 4554 * Disable software LRO, since it would require entering the network 4555 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4556 */ 4557 sc = if_getsoftc(ifp); 4558 switch (event) { 4559 case DEBUGNET_START: 4560 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4561 if (sw_lro_enabled) 4562 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4563 break; 4564 case DEBUGNET_END: 4565 if (sw_lro_enabled) 4566 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4567 break; 4568 } 4569 } 4570 4571 static int 4572 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4573 { 4574 struct vtnet_softc *sc; 4575 struct vtnet_txq *txq; 4576 int error; 4577 4578 sc = if_getsoftc(ifp); 4579 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4580 IFF_DRV_RUNNING) 4581 return (EBUSY); 4582 4583 txq = &sc->vtnet_txqs[0]; 4584 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4585 if (error == 0) 4586 (void)vtnet_txq_notify(txq); 4587 return (error); 4588 } 4589 4590 static int 4591 vtnet_debugnet_poll(if_t ifp, int count) 4592 { 4593 struct vtnet_softc *sc; 4594 int i; 4595 4596 sc = if_getsoftc(ifp); 4597 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4598 IFF_DRV_RUNNING) 4599 return (EBUSY); 4600 4601 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4602 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4603 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4604 return (0); 4605 } 4606 #endif /* DEBUGNET */ 4607