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 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */ 1157 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0); 1158 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0); 1159 1160 if (vtnet_tunable_int(sc, "fixup_needs_csum", 1161 vtnet_fixup_needs_csum) != 0) 1162 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM; 1163 1164 /* Support either "hardware" or software LRO. */ 1165 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0); 1166 } 1167 1168 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) { 1169 /* 1170 * VirtIO does not support VLAN tagging, but we can fake 1171 * it by inserting and removing the 802.1Q header during 1172 * transmit and receive. We are then able to do checksum 1173 * offloading of VLAN frames. 1174 */ 1175 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0); 1176 } 1177 1178 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO) 1179 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0); 1180 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0); 1181 if_setcapabilitiesbit(ifp, IFCAP_HWSTATS, 0); 1182 1183 /* 1184 * Capabilities after here are not enabled by default. 1185 */ 1186 if_setcapenable(ifp, if_getcapabilities(ifp)); 1187 1188 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 1189 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0); 1190 1191 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 1192 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 1193 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 1194 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 1195 } 1196 1197 ether_ifattach(ifp, sc->vtnet_hwaddr); 1198 1199 /* Tell the upper layer(s) we support long frames. */ 1200 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header)); 1201 1202 DEBUGNET_SET(ifp, vtnet); 1203 1204 pa.pa_version = PFIL_VERSION; 1205 pa.pa_flags = PFIL_IN; 1206 pa.pa_type = PFIL_TYPE_ETHERNET; 1207 pa.pa_headname = if_name(ifp); 1208 sc->vtnet_pfil = pfil_head_register(&pa); 1209 1210 return (0); 1211 } 1212 1213 static int 1214 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) 1215 { 1216 int framesz; 1217 1218 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) 1219 return (MJUMPAGESIZE); 1220 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1221 return (MCLBYTES); 1222 1223 /* 1224 * Try to scale the receive mbuf cluster size from the MTU. We 1225 * could also use the VQ size to influence the selected size, 1226 * but that would only matter for very small queues. 1227 */ 1228 if (vtnet_modern(sc)) { 1229 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1)); 1230 framesz = sizeof(struct virtio_net_hdr_v1); 1231 } else 1232 framesz = sizeof(struct vtnet_rx_header); 1233 framesz += sizeof(struct ether_vlan_header) + mtu; 1234 /* 1235 * Account for the offsetting we'll do elsewhere so we allocate the 1236 * right size for the mtu. 1237 */ 1238 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1239 framesz += VTNET_ETHER_ALIGN; 1240 } 1241 1242 if (framesz <= MCLBYTES) 1243 return (MCLBYTES); 1244 else if (framesz <= MJUMPAGESIZE) 1245 return (MJUMPAGESIZE); 1246 else if (framesz <= MJUM9BYTES) 1247 return (MJUM9BYTES); 1248 1249 /* Sane default; avoid 16KB clusters. */ 1250 return (MCLBYTES); 1251 } 1252 1253 static int 1254 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu) 1255 { 1256 if_t ifp; 1257 int clustersz; 1258 1259 ifp = sc->vtnet_ifp; 1260 VTNET_CORE_LOCK_ASSERT(sc); 1261 1262 if (if_getmtu(ifp) == mtu) 1263 return (0); 1264 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu) 1265 return (EINVAL); 1266 1267 if_setmtu(ifp, mtu); 1268 clustersz = vtnet_rx_cluster_size(sc, mtu); 1269 1270 if (clustersz != sc->vtnet_rx_clustersz && 1271 if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1272 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1273 vtnet_init_locked(sc, 0); 1274 } 1275 1276 return (0); 1277 } 1278 1279 static int 1280 vtnet_ioctl_ifflags(struct vtnet_softc *sc) 1281 { 1282 if_t ifp; 1283 int drv_running; 1284 1285 ifp = sc->vtnet_ifp; 1286 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0; 1287 1288 VTNET_CORE_LOCK_ASSERT(sc); 1289 1290 if ((if_getflags(ifp) & IFF_UP) == 0) { 1291 if (drv_running) 1292 vtnet_stop(sc); 1293 goto out; 1294 } 1295 1296 if (!drv_running) { 1297 vtnet_init_locked(sc, 0); 1298 goto out; 1299 } 1300 1301 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) & 1302 (IFF_PROMISC | IFF_ALLMULTI)) { 1303 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 1304 vtnet_rx_filter(sc); 1305 else { 1306 /* 1307 * We don't support filtering out multicast, so 1308 * ALLMULTI is always set. 1309 */ 1310 if_setflagbits(ifp, IFF_ALLMULTI, 0); 1311 if_setflagbits(ifp, IFF_PROMISC, 0); 1312 } 1313 } 1314 1315 out: 1316 sc->vtnet_if_flags = if_getflags(ifp); 1317 return (0); 1318 } 1319 1320 static int 1321 vtnet_ioctl_multi(struct vtnet_softc *sc) 1322 { 1323 if_t ifp; 1324 1325 ifp = sc->vtnet_ifp; 1326 1327 VTNET_CORE_LOCK_ASSERT(sc); 1328 1329 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX && 1330 if_getdrvflags(ifp) & IFF_DRV_RUNNING) 1331 vtnet_rx_filter_mac(sc); 1332 1333 return (0); 1334 } 1335 1336 static int 1337 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr) 1338 { 1339 if_t ifp; 1340 int mask, reinit, update; 1341 1342 ifp = sc->vtnet_ifp; 1343 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp); 1344 reinit = update = 0; 1345 1346 VTNET_CORE_LOCK_ASSERT(sc); 1347 1348 if (mask & IFCAP_TXCSUM) { 1349 if_togglecapenable(ifp, IFCAP_TXCSUM); 1350 if_togglehwassist(ifp, VTNET_CSUM_OFFLOAD); 1351 } 1352 if (mask & IFCAP_TXCSUM_IPV6) { 1353 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6); 1354 if_togglehwassist(ifp, VTNET_CSUM_OFFLOAD_IPV6); 1355 } 1356 if (mask & IFCAP_TSO4) { 1357 if_togglecapenable(ifp, IFCAP_TSO4); 1358 if_togglehwassist(ifp, IFCAP_TSO4); 1359 } 1360 if (mask & IFCAP_TSO6) { 1361 if_togglecapenable(ifp, IFCAP_TSO6); 1362 if_togglehwassist(ifp, IFCAP_TSO6); 1363 } 1364 1365 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) { 1366 /* 1367 * These Rx features require the negotiated features to 1368 * be updated. Avoid a full reinit if possible. 1369 */ 1370 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 1371 update = 1; 1372 else 1373 reinit = 1; 1374 1375 /* BMV: Avoid needless renegotiation for just software LRO. */ 1376 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) == 1377 IFCAP_LRO && vtnet_software_lro(sc)) 1378 reinit = update = 0; 1379 /* 1380 * VirtIO does not distinguish between receive checksum offload 1381 * for IPv4 and IPv6 packets, so treat them as a pair. 1382 */ 1383 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 1384 if_togglecapenable(ifp, IFCAP_RXCSUM); 1385 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6); 1386 } 1387 if (mask & IFCAP_LRO) 1388 if_togglecapenable(ifp, IFCAP_LRO); 1389 /* Both SW and HW TCP LRO require receive checksum offload. */ 1390 if ((if_getcapenable(ifp) & 1391 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 1392 if_setcapenablebit(ifp, 0, IFCAP_LRO); 1393 } 1394 1395 if (mask & IFCAP_VLAN_HWFILTER) { 1396 /* These Rx features require renegotiation. */ 1397 reinit = 1; 1398 1399 if (mask & IFCAP_VLAN_HWFILTER) 1400 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER); 1401 } 1402 1403 if (mask & IFCAP_VLAN_HWTSO) 1404 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO); 1405 if (mask & IFCAP_VLAN_HWTAGGING) 1406 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING); 1407 1408 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 1409 if (reinit) { 1410 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 1411 vtnet_init_locked(sc, 0); 1412 } else if (update) 1413 vtnet_update_rx_offloads(sc); 1414 } 1415 1416 return (0); 1417 } 1418 1419 static int 1420 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 1421 { 1422 struct vtnet_softc *sc; 1423 struct ifreq *ifr; 1424 int error; 1425 1426 sc = if_getsoftc(ifp); 1427 ifr = (struct ifreq *) data; 1428 error = 0; 1429 1430 switch (cmd) { 1431 case SIOCSIFMTU: 1432 VTNET_CORE_LOCK(sc); 1433 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu); 1434 VTNET_CORE_UNLOCK(sc); 1435 break; 1436 1437 case SIOCSIFFLAGS: 1438 VTNET_CORE_LOCK(sc); 1439 error = vtnet_ioctl_ifflags(sc); 1440 VTNET_CORE_UNLOCK(sc); 1441 break; 1442 1443 case SIOCADDMULTI: 1444 case SIOCDELMULTI: 1445 VTNET_CORE_LOCK(sc); 1446 error = vtnet_ioctl_multi(sc); 1447 VTNET_CORE_UNLOCK(sc); 1448 break; 1449 1450 case SIOCSIFMEDIA: 1451 case SIOCGIFMEDIA: 1452 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1453 break; 1454 1455 case SIOCSIFCAP: 1456 VTNET_CORE_LOCK(sc); 1457 error = vtnet_ioctl_ifcap(sc, ifr); 1458 VTNET_CORE_UNLOCK(sc); 1459 VLAN_CAPABILITIES(ifp); 1460 break; 1461 1462 default: 1463 error = ether_ioctl(ifp, cmd, data); 1464 break; 1465 } 1466 1467 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc); 1468 1469 return (error); 1470 } 1471 1472 static int 1473 vtnet_rxq_populate(struct vtnet_rxq *rxq) 1474 { 1475 struct virtqueue *vq; 1476 int nbufs, error; 1477 1478 #ifdef DEV_NETMAP 1479 error = vtnet_netmap_rxq_populate(rxq); 1480 if (error >= 0) 1481 return (error); 1482 #endif /* DEV_NETMAP */ 1483 1484 vq = rxq->vtnrx_vq; 1485 error = ENOSPC; 1486 1487 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1488 error = vtnet_rxq_new_buf(rxq); 1489 if (error) 1490 break; 1491 } 1492 1493 if (nbufs > 0) { 1494 virtqueue_notify(vq); 1495 /* 1496 * EMSGSIZE signifies the virtqueue did not have enough 1497 * entries available to hold the last mbuf. This is not 1498 * an error. 1499 */ 1500 if (error == EMSGSIZE) 1501 error = 0; 1502 } 1503 1504 return (error); 1505 } 1506 1507 static void 1508 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq) 1509 { 1510 struct virtqueue *vq; 1511 struct mbuf *m; 1512 int last; 1513 #ifdef DEV_NETMAP 1514 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp), 1515 rxq->vtnrx_id, NR_RX); 1516 #else /* !DEV_NETMAP */ 1517 void *kring = NULL; 1518 #endif /* !DEV_NETMAP */ 1519 1520 vq = rxq->vtnrx_vq; 1521 last = 0; 1522 1523 while ((m = virtqueue_drain(vq, &last)) != NULL) { 1524 if (kring == NULL) 1525 m_freem(m); 1526 } 1527 1528 KASSERT(virtqueue_empty(vq), 1529 ("%s: mbufs remaining in rx queue %p", __func__, rxq)); 1530 } 1531 1532 static struct mbuf * 1533 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1534 { 1535 struct mbuf *m_head, *m_tail, *m; 1536 int i, size; 1537 1538 m_head = NULL; 1539 size = sc->vtnet_rx_clustersz; 1540 1541 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1542 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs)); 1543 1544 for (i = 0; i < nbufs; i++) { 1545 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size); 1546 if (m == NULL) { 1547 sc->vtnet_stats.mbuf_alloc_failed++; 1548 m_freem(m_head); 1549 return (NULL); 1550 } 1551 1552 m->m_len = size; 1553 /* 1554 * Need to offset the mbuf if the header we're going to add 1555 * will misalign. 1556 */ 1557 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { 1558 m_adj(m, VTNET_ETHER_ALIGN); 1559 } 1560 if (m_head != NULL) { 1561 m_tail->m_next = m; 1562 m_tail = m; 1563 } else 1564 m_head = m_tail = m; 1565 } 1566 1567 if (m_tailp != NULL) 1568 *m_tailp = m_tail; 1569 1570 return (m_head); 1571 } 1572 1573 /* 1574 * Slow path for when LRO without mergeable buffers is negotiated. 1575 */ 1576 static int 1577 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, 1578 int len0) 1579 { 1580 struct vtnet_softc *sc; 1581 struct mbuf *m, *m_prev, *m_new, *m_tail; 1582 int len, clustersz, nreplace, error; 1583 1584 sc = rxq->vtnrx_sc; 1585 clustersz = sc->vtnet_rx_clustersz; 1586 /* 1587 * Need to offset the mbuf if the header we're going to add will 1588 * misalign, account for that here. 1589 */ 1590 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) 1591 clustersz -= VTNET_ETHER_ALIGN; 1592 1593 m_prev = NULL; 1594 m_tail = NULL; 1595 nreplace = 0; 1596 1597 m = m0; 1598 len = len0; 1599 1600 /* 1601 * Since these mbuf chains are so large, avoid allocating a complete 1602 * replacement when the received frame did not consume the entire 1603 * chain. Unused mbufs are moved to the tail of the replacement mbuf. 1604 */ 1605 while (len > 0) { 1606 if (m == NULL) { 1607 sc->vtnet_stats.rx_frame_too_large++; 1608 return (EMSGSIZE); 1609 } 1610 1611 /* 1612 * Every mbuf should have the expected cluster size since that 1613 * is also used to allocate the replacements. 1614 */ 1615 KASSERT(m->m_len == clustersz, 1616 ("%s: mbuf size %d not expected cluster size %d", __func__, 1617 m->m_len, clustersz)); 1618 1619 m->m_len = MIN(m->m_len, len); 1620 len -= m->m_len; 1621 1622 m_prev = m; 1623 m = m->m_next; 1624 nreplace++; 1625 } 1626 1627 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs, 1628 ("%s: invalid replacement mbuf count %d max %d", __func__, 1629 nreplace, sc->vtnet_rx_nmbufs)); 1630 1631 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail); 1632 if (m_new == NULL) { 1633 m_prev->m_len = clustersz; 1634 return (ENOBUFS); 1635 } 1636 1637 /* 1638 * Move any unused mbufs from the received mbuf chain onto the 1639 * end of the replacement chain. 1640 */ 1641 if (m_prev->m_next != NULL) { 1642 m_tail->m_next = m_prev->m_next; 1643 m_prev->m_next = NULL; 1644 } 1645 1646 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1647 if (error) { 1648 /* 1649 * The replacement is suppose to be an copy of the one 1650 * dequeued so this is a very unexpected error. 1651 * 1652 * Restore the m0 chain to the original state if it was 1653 * modified so we can then discard it. 1654 */ 1655 if (m_tail->m_next != NULL) { 1656 m_prev->m_next = m_tail->m_next; 1657 m_tail->m_next = NULL; 1658 } 1659 m_prev->m_len = clustersz; 1660 sc->vtnet_stats.rx_enq_replacement_failed++; 1661 m_freem(m_new); 1662 } 1663 1664 return (error); 1665 } 1666 1667 static int 1668 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len) 1669 { 1670 struct vtnet_softc *sc; 1671 struct mbuf *m_new; 1672 int error; 1673 1674 sc = rxq->vtnrx_sc; 1675 1676 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) 1677 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len)); 1678 1679 MPASS(m->m_next == NULL); 1680 if (m->m_len < len) 1681 return (EMSGSIZE); 1682 1683 m_new = vtnet_rx_alloc_buf(sc, 1, NULL); 1684 if (m_new == NULL) 1685 return (ENOBUFS); 1686 1687 error = vtnet_rxq_enqueue_buf(rxq, m_new); 1688 if (error) { 1689 sc->vtnet_stats.rx_enq_replacement_failed++; 1690 m_freem(m_new); 1691 } else 1692 m->m_len = len; 1693 1694 return (error); 1695 } 1696 1697 static int 1698 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1699 { 1700 struct vtnet_softc *sc; 1701 struct sglist *sg; 1702 int header_inlined, error; 1703 1704 sc = rxq->vtnrx_sc; 1705 sg = rxq->vtnrx_sg; 1706 1707 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1708 ("%s: mbuf chain without LRO_NOMRG", __func__)); 1709 VTNET_RXQ_LOCK_ASSERT(rxq); 1710 1711 sglist_reset(sg); 1712 header_inlined = vtnet_modern(sc) || 1713 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */ 1714 1715 /* 1716 * Note: The mbuf has been already adjusted when we allocate it if we 1717 * have to do strict alignment. 1718 */ 1719 if (header_inlined) 1720 error = sglist_append_mbuf(sg, m); 1721 else { 1722 struct vtnet_rx_header *rxhdr = 1723 mtod(m, struct vtnet_rx_header *); 1724 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr)); 1725 1726 /* Append the header and remaining mbuf data. */ 1727 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size); 1728 if (error) 1729 return (error); 1730 error = sglist_append(sg, &rxhdr[1], 1731 m->m_len - sizeof(struct vtnet_rx_header)); 1732 if (error) 1733 return (error); 1734 1735 if (m->m_next != NULL) 1736 error = sglist_append_mbuf(sg, m->m_next); 1737 } 1738 1739 if (error) 1740 return (error); 1741 1742 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg)); 1743 } 1744 1745 static int 1746 vtnet_rxq_new_buf(struct vtnet_rxq *rxq) 1747 { 1748 struct vtnet_softc *sc; 1749 struct mbuf *m; 1750 int error; 1751 1752 sc = rxq->vtnrx_sc; 1753 1754 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL); 1755 if (m == NULL) 1756 return (ENOBUFS); 1757 1758 error = vtnet_rxq_enqueue_buf(rxq, m); 1759 if (error) 1760 m_freem(m); 1761 1762 return (error); 1763 } 1764 1765 #if defined(INET) || defined(INET6) 1766 static int 1767 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, bool isipv6, 1768 int protocol, struct virtio_net_hdr *hdr) 1769 { 1770 struct vtnet_softc *sc; 1771 1772 /* 1773 * The packet is likely from another VM on the same host or from the 1774 * host that itself performed checksum offloading so Tx/Rx is basically 1775 * a memcpy and the checksum has little value so far. 1776 */ 1777 1778 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP, 1779 ("%s: unsupported IP protocol %d", __func__, protocol)); 1780 1781 /* 1782 * If the user don't want us to fix it up here by computing the 1783 * checksum, just forward the order to compute the checksum by setting 1784 * the corresponding mbuf flag (e.g., CSUM_TCP). 1785 */ 1786 sc = rxq->vtnrx_sc; 1787 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) { 1788 switch (protocol) { 1789 case IPPROTO_TCP: 1790 m->m_pkthdr.csum_flags |= 1791 (isipv6 ? CSUM_TCP_IPV6 : CSUM_TCP); 1792 break; 1793 case IPPROTO_UDP: 1794 m->m_pkthdr.csum_flags |= 1795 (isipv6 ? CSUM_UDP_IPV6 : CSUM_UDP); 1796 break; 1797 } 1798 m->m_pkthdr.csum_data = hdr->csum_offset; 1799 return (0); 1800 } 1801 1802 /* 1803 * Compute the checksum in the driver so the packet will contain a 1804 * valid checksum. The checksum is at csum_offset from csum_start. 1805 */ 1806 int csum_off, csum_end; 1807 uint16_t csum; 1808 1809 csum_off = hdr->csum_start + hdr->csum_offset; 1810 csum_end = csum_off + sizeof(uint16_t); 1811 1812 /* Assume checksum will be in the first mbuf. */ 1813 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) { 1814 sc->vtnet_stats.rx_csum_bad_offset++; 1815 return (1); 1816 } 1817 1818 /* 1819 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the 1820 * checksum and write it at the specified offset. We could 1821 * try to verify the packet: csum_start should probably 1822 * correspond to the start of the TCP/UDP header. 1823 * 1824 * BMV: Need to properly handle UDP with zero checksum. Is 1825 * the IPv4 header checksum implicitly validated? 1826 */ 1827 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start); 1828 *(uint16_t *)(mtodo(m, csum_off)) = csum; 1829 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1830 m->m_pkthdr.csum_data = 0xFFFF; 1831 1832 return (0); 1833 } 1834 1835 static void 1836 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, int protocol) 1837 { 1838 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP, 1839 ("%s: unsupported IP protocol %d", __func__, protocol)); 1840 1841 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1842 m->m_pkthdr.csum_data = 0xFFFF; 1843 } 1844 1845 static int 1846 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m, 1847 struct virtio_net_hdr *hdr) 1848 { 1849 const struct ether_header *eh; 1850 struct vtnet_softc *sc; 1851 int hoff, protocol; 1852 uint16_t etype; 1853 bool isipv6; 1854 1855 KASSERT(hdr->flags & 1856 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID), 1857 ("%s: missing checksum offloading flag %x", __func__, hdr->flags)); 1858 1859 eh = mtod(m, const struct ether_header *); 1860 etype = ntohs(eh->ether_type); 1861 if (etype == ETHERTYPE_VLAN) { 1862 /* TODO BMV: Handle QinQ. */ 1863 const struct ether_vlan_header *evh = 1864 mtod(m, const struct ether_vlan_header *); 1865 etype = ntohs(evh->evl_proto); 1866 hoff = sizeof(struct ether_vlan_header); 1867 } else 1868 hoff = sizeof(struct ether_header); 1869 1870 sc = rxq->vtnrx_sc; 1871 1872 /* Check whether ethernet type is IP or IPv6, and get protocol. */ 1873 switch (etype) { 1874 #if defined(INET) 1875 case ETHERTYPE_IP: 1876 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) { 1877 sc->vtnet_stats.rx_csum_inaccessible_ipproto++; 1878 return (1); 1879 } else { 1880 struct ip *ip = (struct ip *)(m->m_data + hoff); 1881 protocol = ip->ip_p; 1882 } 1883 isipv6 = false; 1884 break; 1885 #endif 1886 #if defined(INET6) 1887 case ETHERTYPE_IPV6: 1888 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr)) 1889 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) { 1890 sc->vtnet_stats.rx_csum_inaccessible_ipproto++; 1891 return (1); 1892 } 1893 isipv6 = true; 1894 break; 1895 #endif 1896 default: 1897 sc->vtnet_stats.rx_csum_bad_ethtype++; 1898 return (1); 1899 } 1900 1901 /* Check whether protocol is TCP or UDP. */ 1902 switch (protocol) { 1903 case IPPROTO_TCP: 1904 case IPPROTO_UDP: 1905 break; 1906 default: 1907 /* 1908 * FreeBSD does not support checksum offloading of this 1909 * protocol here. 1910 */ 1911 sc->vtnet_stats.rx_csum_bad_ipproto++; 1912 return (1); 1913 } 1914 1915 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1916 return (vtnet_rxq_csum_needs_csum(rxq, m, isipv6, protocol, 1917 hdr)); 1918 else /* VIRTIO_NET_HDR_F_DATA_VALID */ 1919 vtnet_rxq_csum_data_valid(rxq, m, protocol); 1920 1921 return (0); 1922 } 1923 #endif 1924 1925 static void 1926 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs) 1927 { 1928 struct mbuf *m; 1929 1930 while (--nbufs > 0) { 1931 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL); 1932 if (m == NULL) 1933 break; 1934 vtnet_rxq_discard_buf(rxq, m); 1935 } 1936 } 1937 1938 static void 1939 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m) 1940 { 1941 int error __diagused; 1942 1943 /* 1944 * Requeue the discarded mbuf. This should always be successful 1945 * since it was just dequeued. 1946 */ 1947 error = vtnet_rxq_enqueue_buf(rxq, m); 1948 KASSERT(error == 0, 1949 ("%s: cannot requeue discarded mbuf %d", __func__, error)); 1950 } 1951 1952 static int 1953 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs) 1954 { 1955 struct vtnet_softc *sc; 1956 struct virtqueue *vq; 1957 struct mbuf *m_tail; 1958 1959 sc = rxq->vtnrx_sc; 1960 vq = rxq->vtnrx_vq; 1961 m_tail = m_head; 1962 1963 while (--nbufs > 0) { 1964 struct mbuf *m; 1965 uint32_t len; 1966 1967 m = virtqueue_dequeue(vq, &len); 1968 if (m == NULL) { 1969 rxq->vtnrx_stats.vrxs_ierrors++; 1970 goto fail; 1971 } 1972 1973 if (vtnet_rxq_new_buf(rxq) != 0) { 1974 rxq->vtnrx_stats.vrxs_iqdrops++; 1975 vtnet_rxq_discard_buf(rxq, m); 1976 if (nbufs > 1) 1977 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 1978 goto fail; 1979 } 1980 1981 if (m->m_len < len) 1982 len = m->m_len; 1983 1984 m->m_len = len; 1985 m->m_flags &= ~M_PKTHDR; 1986 1987 m_head->m_pkthdr.len += len; 1988 m_tail->m_next = m; 1989 m_tail = m; 1990 } 1991 1992 return (0); 1993 1994 fail: 1995 sc->vtnet_stats.rx_mergeable_failed++; 1996 m_freem(m_head); 1997 1998 return (1); 1999 } 2000 2001 #if defined(INET) || defined(INET6) 2002 static int 2003 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m) 2004 { 2005 struct lro_ctrl *lro; 2006 2007 lro = &rxq->vtnrx_lro; 2008 2009 if (lro->lro_mbuf_max != 0) { 2010 tcp_lro_queue_mbuf(lro, m); 2011 return (0); 2012 } 2013 2014 return (tcp_lro_rx(lro, m, 0)); 2015 } 2016 #endif 2017 2018 static void 2019 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m, 2020 struct virtio_net_hdr *hdr) 2021 { 2022 struct vtnet_softc *sc; 2023 if_t ifp; 2024 2025 sc = rxq->vtnrx_sc; 2026 ifp = sc->vtnet_ifp; 2027 2028 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) { 2029 struct ether_header *eh = mtod(m, struct ether_header *); 2030 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2031 vtnet_vlan_tag_remove(m); 2032 /* 2033 * With the 802.1Q header removed, update the 2034 * checksum starting location accordingly. 2035 */ 2036 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2037 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN; 2038 } 2039 } 2040 2041 m->m_pkthdr.flowid = rxq->vtnrx_id; 2042 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 2043 2044 if (hdr->flags & 2045 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) { 2046 #if defined(INET) || defined(INET6) 2047 if (vtnet_rxq_csum(rxq, m, hdr) == 0) 2048 rxq->vtnrx_stats.vrxs_csum++; 2049 else 2050 rxq->vtnrx_stats.vrxs_csum_failed++; 2051 #else 2052 sc->vtnet_stats.rx_csum_bad_ethtype++; 2053 rxq->vtnrx_stats.vrxs_csum_failed++; 2054 #endif 2055 } 2056 2057 if (hdr->gso_size != 0) { 2058 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 2059 case VIRTIO_NET_HDR_GSO_TCPV4: 2060 case VIRTIO_NET_HDR_GSO_TCPV6: 2061 m->m_pkthdr.lro_nsegs = 2062 howmany(m->m_pkthdr.len, hdr->gso_size); 2063 rxq->vtnrx_stats.vrxs_host_lro++; 2064 break; 2065 } 2066 } 2067 2068 rxq->vtnrx_stats.vrxs_ipackets++; 2069 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len; 2070 2071 #if defined(INET) || defined(INET6) 2072 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) { 2073 if (vtnet_lro_rx(rxq, m) == 0) 2074 return; 2075 } 2076 #endif 2077 2078 if_input(ifp, m); 2079 } 2080 2081 static int 2082 vtnet_rxq_eof(struct vtnet_rxq *rxq) 2083 { 2084 struct virtio_net_hdr lhdr, *hdr; 2085 struct vtnet_softc *sc; 2086 if_t ifp; 2087 struct virtqueue *vq; 2088 int deq, count; 2089 2090 sc = rxq->vtnrx_sc; 2091 vq = rxq->vtnrx_vq; 2092 ifp = sc->vtnet_ifp; 2093 deq = 0; 2094 count = sc->vtnet_rx_process_limit; 2095 2096 VTNET_RXQ_LOCK_ASSERT(rxq); 2097 2098 CURVNET_SET(if_getvnet(ifp)); 2099 while (count-- > 0) { 2100 struct mbuf *m; 2101 uint32_t len, nbufs, adjsz; 2102 2103 m = virtqueue_dequeue(vq, &len); 2104 if (m == NULL) 2105 break; 2106 deq++; 2107 2108 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 2109 rxq->vtnrx_stats.vrxs_ierrors++; 2110 vtnet_rxq_discard_buf(rxq, m); 2111 continue; 2112 } 2113 2114 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) { 2115 struct virtio_net_hdr_mrg_rxbuf *mhdr = 2116 mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 2117 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED); 2118 nbufs = vtnet_htog16(sc, mhdr->num_buffers); 2119 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2120 } else if (vtnet_modern(sc)) { 2121 nbufs = 1; /* num_buffers is always 1 */ 2122 adjsz = sizeof(struct virtio_net_hdr_v1); 2123 } else { 2124 nbufs = 1; 2125 adjsz = sizeof(struct vtnet_rx_header); 2126 /* 2127 * Account for our gap between the header and start of 2128 * data to keep the segments separated. 2129 */ 2130 len += VTNET_RX_HEADER_PAD; 2131 } 2132 2133 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) { 2134 rxq->vtnrx_stats.vrxs_iqdrops++; 2135 vtnet_rxq_discard_buf(rxq, m); 2136 if (nbufs > 1) 2137 vtnet_rxq_discard_merged_bufs(rxq, nbufs); 2138 continue; 2139 } 2140 2141 m->m_pkthdr.len = len; 2142 m->m_pkthdr.rcvif = ifp; 2143 m->m_pkthdr.csum_flags = 0; 2144 2145 if (nbufs > 1) { 2146 /* Dequeue the rest of chain. */ 2147 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0) 2148 continue; 2149 } 2150 2151 kmsan_mark_mbuf(m, KMSAN_STATE_INITED); 2152 2153 /* 2154 * Save an endian swapped version of the header prior to it 2155 * being stripped. The header is always at the start of the 2156 * mbuf data. num_buffers was already saved (and not needed) 2157 * so use the standard header. 2158 */ 2159 hdr = mtod(m, struct virtio_net_hdr *); 2160 lhdr.flags = hdr->flags; 2161 lhdr.gso_type = hdr->gso_type; 2162 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len); 2163 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size); 2164 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start); 2165 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset); 2166 m_adj(m, adjsz); 2167 2168 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) { 2169 pfil_return_t pfil; 2170 2171 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL); 2172 switch (pfil) { 2173 case PFIL_DROPPED: 2174 case PFIL_CONSUMED: 2175 continue; 2176 default: 2177 KASSERT(pfil == PFIL_PASS, 2178 ("Filter returned %d!", pfil)); 2179 } 2180 } 2181 2182 vtnet_rxq_input(rxq, m, &lhdr); 2183 } 2184 2185 if (deq > 0) { 2186 #if defined(INET) || defined(INET6) 2187 if (vtnet_software_lro(sc)) 2188 tcp_lro_flush_all(&rxq->vtnrx_lro); 2189 #endif 2190 virtqueue_notify(vq); 2191 } 2192 CURVNET_RESTORE(); 2193 2194 return (count > 0 ? 0 : EAGAIN); 2195 } 2196 2197 static void 2198 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries) 2199 { 2200 struct vtnet_softc *sc; 2201 if_t ifp; 2202 u_int more; 2203 #ifdef DEV_NETMAP 2204 int nmirq; 2205 #endif /* DEV_NETMAP */ 2206 2207 sc = rxq->vtnrx_sc; 2208 ifp = sc->vtnet_ifp; 2209 2210 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) { 2211 /* 2212 * Ignore this interrupt. Either this is a spurious interrupt 2213 * or multiqueue without per-VQ MSIX so every queue needs to 2214 * be polled (a brain dead configuration we could try harder 2215 * to avoid). 2216 */ 2217 vtnet_rxq_disable_intr(rxq); 2218 return; 2219 } 2220 2221 VTNET_RXQ_LOCK(rxq); 2222 2223 #ifdef DEV_NETMAP 2224 /* 2225 * We call netmap_rx_irq() under lock to prevent concurrent calls. 2226 * This is not necessary to serialize the access to the RX vq, but 2227 * rather to avoid races that may happen if this interface is 2228 * attached to a VALE switch, which would cause received packets 2229 * to stall in the RX queue (nm_kr_tryget() could find the kring 2230 * busy when called from netmap_bwrap_intr_notify()). 2231 */ 2232 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more); 2233 if (nmirq != NM_IRQ_PASS) { 2234 VTNET_RXQ_UNLOCK(rxq); 2235 if (nmirq == NM_IRQ_RESCHED) { 2236 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2237 } 2238 return; 2239 } 2240 #endif /* DEV_NETMAP */ 2241 2242 again: 2243 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2244 VTNET_RXQ_UNLOCK(rxq); 2245 return; 2246 } 2247 2248 more = vtnet_rxq_eof(rxq); 2249 if (more || vtnet_rxq_enable_intr(rxq) != 0) { 2250 if (!more) 2251 vtnet_rxq_disable_intr(rxq); 2252 /* 2253 * This is an occasional condition or race (when !more), 2254 * so retry a few times before scheduling the taskqueue. 2255 */ 2256 if (tries-- > 0) 2257 goto again; 2258 2259 rxq->vtnrx_stats.vrxs_rescheduled++; 2260 VTNET_RXQ_UNLOCK(rxq); 2261 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 2262 } else 2263 VTNET_RXQ_UNLOCK(rxq); 2264 } 2265 2266 static void 2267 vtnet_rx_vq_intr(void *xrxq) 2268 { 2269 struct vtnet_rxq *rxq; 2270 2271 rxq = xrxq; 2272 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES); 2273 } 2274 2275 static void 2276 vtnet_rxq_tq_intr(void *xrxq, int pending __unused) 2277 { 2278 struct vtnet_rxq *rxq; 2279 2280 rxq = xrxq; 2281 vtnet_rx_vq_process(rxq, 0); 2282 } 2283 2284 static int 2285 vtnet_txq_intr_threshold(struct vtnet_txq *txq) 2286 { 2287 struct vtnet_softc *sc; 2288 int threshold; 2289 2290 sc = txq->vtntx_sc; 2291 2292 /* 2293 * The Tx interrupt is disabled until the queue free count falls 2294 * below our threshold. Completed frames are drained from the Tx 2295 * virtqueue before transmitting new frames and in the watchdog 2296 * callout, so the frequency of Tx interrupts is greatly reduced, 2297 * at the cost of not freeing mbufs as quickly as they otherwise 2298 * would be. 2299 */ 2300 threshold = virtqueue_size(txq->vtntx_vq) / 4; 2301 2302 /* 2303 * Without indirect descriptors, leave enough room for the most 2304 * segments we handle. 2305 */ 2306 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 && 2307 threshold < sc->vtnet_tx_nsegs) 2308 threshold = sc->vtnet_tx_nsegs; 2309 2310 return (threshold); 2311 } 2312 2313 static int 2314 vtnet_txq_below_threshold(struct vtnet_txq *txq) 2315 { 2316 struct virtqueue *vq; 2317 2318 vq = txq->vtntx_vq; 2319 2320 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold); 2321 } 2322 2323 static int 2324 vtnet_txq_notify(struct vtnet_txq *txq) 2325 { 2326 struct virtqueue *vq; 2327 2328 vq = txq->vtntx_vq; 2329 2330 txq->vtntx_watchdog = VTNET_TX_TIMEOUT; 2331 virtqueue_notify(vq); 2332 2333 if (vtnet_txq_enable_intr(txq) == 0) 2334 return (0); 2335 2336 /* 2337 * Drain frames that were completed since last checked. If this 2338 * causes the queue to go above the threshold, the caller should 2339 * continue transmitting. 2340 */ 2341 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) { 2342 virtqueue_disable_intr(vq); 2343 return (1); 2344 } 2345 2346 return (0); 2347 } 2348 2349 static void 2350 vtnet_txq_free_mbufs(struct vtnet_txq *txq) 2351 { 2352 struct virtqueue *vq; 2353 struct vtnet_tx_header *txhdr; 2354 int last; 2355 #ifdef DEV_NETMAP 2356 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp), 2357 txq->vtntx_id, NR_TX); 2358 #else /* !DEV_NETMAP */ 2359 void *kring = NULL; 2360 #endif /* !DEV_NETMAP */ 2361 2362 vq = txq->vtntx_vq; 2363 last = 0; 2364 2365 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 2366 if (kring == NULL) { 2367 m_freem(txhdr->vth_mbuf); 2368 uma_zfree(vtnet_tx_header_zone, txhdr); 2369 } 2370 } 2371 2372 KASSERT(virtqueue_empty(vq), 2373 ("%s: mbufs remaining in tx queue %p", __func__, txq)); 2374 } 2375 2376 /* 2377 * BMV: This can go away once we finally have offsets in the mbuf header. 2378 */ 2379 static int 2380 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype, 2381 int *proto, int *start) 2382 { 2383 struct vtnet_softc *sc; 2384 struct ether_vlan_header *evh; 2385 #if defined(INET) || defined(INET6) 2386 int offset; 2387 #endif 2388 2389 sc = txq->vtntx_sc; 2390 2391 evh = mtod(m, struct ether_vlan_header *); 2392 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 2393 /* BMV: We should handle nested VLAN tags too. */ 2394 *etype = ntohs(evh->evl_proto); 2395 #if defined(INET) || defined(INET6) 2396 offset = sizeof(struct ether_vlan_header); 2397 #endif 2398 } else { 2399 *etype = ntohs(evh->evl_encap_proto); 2400 #if defined(INET) || defined(INET6) 2401 offset = sizeof(struct ether_header); 2402 #endif 2403 } 2404 2405 switch (*etype) { 2406 #if defined(INET) 2407 case ETHERTYPE_IP: { 2408 struct ip *ip, iphdr; 2409 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 2410 m_copydata(m, offset, sizeof(struct ip), 2411 (caddr_t) &iphdr); 2412 ip = &iphdr; 2413 } else 2414 ip = (struct ip *)(m->m_data + offset); 2415 *proto = ip->ip_p; 2416 *start = offset + (ip->ip_hl << 2); 2417 break; 2418 } 2419 #endif 2420 #if defined(INET6) 2421 case ETHERTYPE_IPV6: 2422 *proto = -1; 2423 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 2424 /* Assert the network stack sent us a valid packet. */ 2425 KASSERT(*start > offset, 2426 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 2427 *start, offset, *proto)); 2428 break; 2429 #endif 2430 default: 2431 sc->vtnet_stats.tx_csum_unknown_ethtype++; 2432 return (EINVAL); 2433 } 2434 2435 return (0); 2436 } 2437 2438 static int 2439 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type, 2440 int offset, struct virtio_net_hdr *hdr) 2441 { 2442 static struct timeval lastecn; 2443 static int curecn; 2444 struct vtnet_softc *sc; 2445 struct tcphdr *tcp, tcphdr; 2446 2447 sc = txq->vtntx_sc; 2448 2449 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 2450 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 2451 tcp = &tcphdr; 2452 } else 2453 tcp = (struct tcphdr *)(m->m_data + offset); 2454 2455 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2)); 2456 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz); 2457 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 2458 VIRTIO_NET_HDR_GSO_TCPV6; 2459 2460 if (__predict_false(tcp_get_flags(tcp) & TH_CWR)) { 2461 /* 2462 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In 2463 * FreeBSD, ECN support is not on a per-interface basis, 2464 * but globally via the net.inet.tcp.ecn.enable sysctl 2465 * knob. The default is off. 2466 */ 2467 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 2468 if (ppsratecheck(&lastecn, &curecn, 1)) 2469 if_printf(sc->vtnet_ifp, 2470 "TSO with ECN not negotiated with host\n"); 2471 return (ENOTSUP); 2472 } 2473 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 2474 } 2475 2476 txq->vtntx_stats.vtxs_tso++; 2477 2478 return (0); 2479 } 2480 2481 static struct mbuf * 2482 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m, 2483 struct virtio_net_hdr *hdr) 2484 { 2485 struct vtnet_softc *sc; 2486 int flags, etype, csum_start, proto, error; 2487 2488 sc = txq->vtntx_sc; 2489 flags = m->m_pkthdr.csum_flags; 2490 2491 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start); 2492 if (error) 2493 goto drop; 2494 2495 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) { 2496 /* Sanity check the parsed mbuf matches the offload flags. */ 2497 if (__predict_false((flags & VTNET_CSUM_OFFLOAD && 2498 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6 2499 && etype != ETHERTYPE_IPV6))) { 2500 sc->vtnet_stats.tx_csum_proto_mismatch++; 2501 goto drop; 2502 } 2503 2504 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 2505 hdr->csum_start = vtnet_gtoh16(sc, csum_start); 2506 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data); 2507 txq->vtntx_stats.vtxs_csum++; 2508 } else if ((flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) && 2509 (proto == IPPROTO_TCP || proto == IPPROTO_UDP) && 2510 (m->m_pkthdr.csum_data == 0xFFFF)) { 2511 hdr->flags |= VIRTIO_NET_HDR_F_DATA_VALID; 2512 } 2513 2514 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) { 2515 /* 2516 * Sanity check the parsed mbuf IP protocol is TCP, and 2517 * VirtIO TSO reqires the checksum offloading above. 2518 */ 2519 if (__predict_false(proto != IPPROTO_TCP)) { 2520 sc->vtnet_stats.tx_tso_not_tcp++; 2521 goto drop; 2522 } else if (__predict_false((hdr->flags & 2523 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) { 2524 sc->vtnet_stats.tx_tso_without_csum++; 2525 goto drop; 2526 } 2527 2528 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr); 2529 if (error) 2530 goto drop; 2531 } 2532 2533 return (m); 2534 2535 drop: 2536 m_freem(m); 2537 return (NULL); 2538 } 2539 2540 static int 2541 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head, 2542 struct vtnet_tx_header *txhdr) 2543 { 2544 struct vtnet_softc *sc; 2545 struct virtqueue *vq; 2546 struct sglist *sg; 2547 struct mbuf *m; 2548 int error; 2549 2550 sc = txq->vtntx_sc; 2551 vq = txq->vtntx_vq; 2552 sg = txq->vtntx_sg; 2553 m = *m_head; 2554 2555 sglist_reset(sg); 2556 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 2557 if (error != 0 || sg->sg_nseg != 1) { 2558 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d", 2559 __func__, error, sg->sg_nseg)); 2560 goto fail; 2561 } 2562 2563 error = sglist_append_mbuf(sg, m); 2564 if (error) { 2565 m = m_defrag(m, M_NOWAIT); 2566 if (m == NULL) { 2567 sc->vtnet_stats.tx_defrag_failed++; 2568 goto fail; 2569 } 2570 2571 *m_head = m; 2572 sc->vtnet_stats.tx_defragged++; 2573 2574 error = sglist_append_mbuf(sg, m); 2575 if (error) 2576 goto fail; 2577 } 2578 2579 txhdr->vth_mbuf = m; 2580 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0); 2581 2582 return (error); 2583 2584 fail: 2585 m_freem(*m_head); 2586 *m_head = NULL; 2587 2588 return (ENOBUFS); 2589 } 2590 2591 static int 2592 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags) 2593 { 2594 struct vtnet_tx_header *txhdr; 2595 struct virtio_net_hdr *hdr; 2596 struct mbuf *m; 2597 int error; 2598 2599 m = *m_head; 2600 M_ASSERTPKTHDR(m); 2601 2602 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO); 2603 if (txhdr == NULL) { 2604 m_freem(m); 2605 *m_head = NULL; 2606 return (ENOMEM); 2607 } 2608 2609 /* 2610 * Always use the non-mergeable header, regardless if mergable headers 2611 * were negotiated, because for transmit num_buffers is always zero. 2612 * The vtnet_hdr_size is used to enqueue the right header size segment. 2613 */ 2614 hdr = &txhdr->vth_uhdr.hdr; 2615 2616 if (m->m_flags & M_VLANTAG) { 2617 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2618 if ((*m_head = m) == NULL) { 2619 error = ENOBUFS; 2620 goto fail; 2621 } 2622 m->m_flags &= ~M_VLANTAG; 2623 } 2624 2625 if (m->m_pkthdr.csum_flags & 2626 (VTNET_CSUM_ALL_OFFLOAD | CSUM_DATA_VALID)) { 2627 m = vtnet_txq_offload(txq, m, hdr); 2628 if ((*m_head = m) == NULL) { 2629 error = ENOBUFS; 2630 goto fail; 2631 } 2632 } 2633 2634 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr); 2635 fail: 2636 if (error) 2637 uma_zfree(vtnet_tx_header_zone, txhdr); 2638 2639 return (error); 2640 } 2641 2642 2643 static void 2644 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp) 2645 { 2646 struct vtnet_softc *sc; 2647 struct virtqueue *vq; 2648 struct mbuf *m0; 2649 int tries, enq; 2650 2651 sc = txq->vtntx_sc; 2652 vq = txq->vtntx_vq; 2653 tries = 0; 2654 2655 VTNET_TXQ_LOCK_ASSERT(txq); 2656 2657 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2658 sc->vtnet_link_active == 0) 2659 return; 2660 2661 vtnet_txq_eof(txq); 2662 2663 again: 2664 enq = 0; 2665 2666 while (!if_sendq_empty(ifp)) { 2667 if (virtqueue_full(vq)) 2668 break; 2669 2670 m0 = if_dequeue(ifp); 2671 if (m0 == NULL) 2672 break; 2673 2674 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) { 2675 if (m0 != NULL) 2676 if_sendq_prepend(ifp, m0); 2677 break; 2678 } 2679 2680 enq++; 2681 ETHER_BPF_MTAP(ifp, m0); 2682 } 2683 2684 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2685 if (tries++ < VTNET_NOTIFY_RETRIES) 2686 goto again; 2687 2688 txq->vtntx_stats.vtxs_rescheduled++; 2689 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2690 } 2691 } 2692 2693 static void 2694 vtnet_start(if_t ifp) 2695 { 2696 struct vtnet_softc *sc; 2697 struct vtnet_txq *txq; 2698 2699 sc = if_getsoftc(ifp); 2700 txq = &sc->vtnet_txqs[0]; 2701 2702 VTNET_TXQ_LOCK(txq); 2703 vtnet_start_locked(txq, ifp); 2704 VTNET_TXQ_UNLOCK(txq); 2705 } 2706 2707 2708 static int 2709 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m) 2710 { 2711 struct vtnet_softc *sc; 2712 struct virtqueue *vq; 2713 struct buf_ring *br; 2714 if_t ifp; 2715 int enq, tries, error; 2716 2717 sc = txq->vtntx_sc; 2718 vq = txq->vtntx_vq; 2719 br = txq->vtntx_br; 2720 ifp = sc->vtnet_ifp; 2721 tries = 0; 2722 error = 0; 2723 2724 VTNET_TXQ_LOCK_ASSERT(txq); 2725 2726 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 || 2727 sc->vtnet_link_active == 0) { 2728 if (m != NULL) 2729 error = drbr_enqueue(ifp, br, m); 2730 return (error); 2731 } 2732 2733 if (m != NULL) { 2734 error = drbr_enqueue(ifp, br, m); 2735 if (error) 2736 return (error); 2737 } 2738 2739 vtnet_txq_eof(txq); 2740 2741 again: 2742 enq = 0; 2743 2744 while ((m = drbr_peek(ifp, br)) != NULL) { 2745 if (virtqueue_full(vq)) { 2746 drbr_putback(ifp, br, m); 2747 break; 2748 } 2749 2750 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) { 2751 if (m != NULL) 2752 drbr_putback(ifp, br, m); 2753 else 2754 drbr_advance(ifp, br); 2755 break; 2756 } 2757 drbr_advance(ifp, br); 2758 2759 enq++; 2760 ETHER_BPF_MTAP(ifp, m); 2761 } 2762 2763 if (enq > 0 && vtnet_txq_notify(txq) != 0) { 2764 if (tries++ < VTNET_NOTIFY_RETRIES) 2765 goto again; 2766 2767 txq->vtntx_stats.vtxs_rescheduled++; 2768 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask); 2769 } 2770 2771 return (0); 2772 } 2773 2774 static int 2775 vtnet_txq_mq_start(if_t ifp, struct mbuf *m) 2776 { 2777 struct vtnet_softc *sc; 2778 struct vtnet_txq *txq; 2779 int i, npairs, error; 2780 2781 sc = if_getsoftc(ifp); 2782 npairs = sc->vtnet_act_vq_pairs; 2783 2784 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) 2785 i = m->m_pkthdr.flowid % npairs; 2786 else 2787 i = curcpu % npairs; 2788 2789 txq = &sc->vtnet_txqs[i]; 2790 2791 if (VTNET_TXQ_TRYLOCK(txq) != 0) { 2792 error = vtnet_txq_mq_start_locked(txq, m); 2793 VTNET_TXQ_UNLOCK(txq); 2794 } else { 2795 error = drbr_enqueue(ifp, txq->vtntx_br, m); 2796 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask); 2797 } 2798 2799 return (error); 2800 } 2801 2802 static void 2803 vtnet_txq_tq_deferred(void *xtxq, int pending __unused) 2804 { 2805 struct vtnet_softc *sc; 2806 struct vtnet_txq *txq; 2807 2808 txq = xtxq; 2809 sc = txq->vtntx_sc; 2810 2811 VTNET_TXQ_LOCK(txq); 2812 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br)) 2813 vtnet_txq_mq_start_locked(txq, NULL); 2814 VTNET_TXQ_UNLOCK(txq); 2815 } 2816 2817 2818 static void 2819 vtnet_txq_start(struct vtnet_txq *txq) 2820 { 2821 struct vtnet_softc *sc; 2822 if_t ifp; 2823 2824 sc = txq->vtntx_sc; 2825 ifp = sc->vtnet_ifp; 2826 2827 if (!VTNET_ALTQ_ENABLED) { 2828 if (!drbr_empty(ifp, txq->vtntx_br)) 2829 vtnet_txq_mq_start_locked(txq, NULL); 2830 } else { 2831 if (!if_sendq_empty(ifp)) 2832 vtnet_start_locked(txq, ifp); 2833 2834 } 2835 } 2836 2837 static void 2838 vtnet_txq_tq_intr(void *xtxq, int pending __unused) 2839 { 2840 struct vtnet_softc *sc; 2841 struct vtnet_txq *txq; 2842 if_t ifp; 2843 2844 txq = xtxq; 2845 sc = txq->vtntx_sc; 2846 ifp = sc->vtnet_ifp; 2847 2848 VTNET_TXQ_LOCK(txq); 2849 2850 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2851 VTNET_TXQ_UNLOCK(txq); 2852 return; 2853 } 2854 2855 vtnet_txq_eof(txq); 2856 vtnet_txq_start(txq); 2857 2858 VTNET_TXQ_UNLOCK(txq); 2859 } 2860 2861 static int 2862 vtnet_txq_eof(struct vtnet_txq *txq) 2863 { 2864 struct virtqueue *vq; 2865 struct vtnet_tx_header *txhdr; 2866 struct mbuf *m; 2867 int deq; 2868 2869 vq = txq->vtntx_vq; 2870 deq = 0; 2871 VTNET_TXQ_LOCK_ASSERT(txq); 2872 2873 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 2874 m = txhdr->vth_mbuf; 2875 deq++; 2876 2877 txq->vtntx_stats.vtxs_opackets++; 2878 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len; 2879 if (m->m_flags & M_MCAST) 2880 txq->vtntx_stats.vtxs_omcasts++; 2881 2882 m_freem(m); 2883 uma_zfree(vtnet_tx_header_zone, txhdr); 2884 } 2885 2886 if (virtqueue_empty(vq)) 2887 txq->vtntx_watchdog = 0; 2888 2889 return (deq); 2890 } 2891 2892 static void 2893 vtnet_tx_vq_intr(void *xtxq) 2894 { 2895 struct vtnet_softc *sc; 2896 struct vtnet_txq *txq; 2897 if_t ifp; 2898 2899 txq = xtxq; 2900 sc = txq->vtntx_sc; 2901 ifp = sc->vtnet_ifp; 2902 2903 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) { 2904 /* 2905 * Ignore this interrupt. Either this is a spurious interrupt 2906 * or multiqueue without per-VQ MSIX so every queue needs to 2907 * be polled (a brain dead configuration we could try harder 2908 * to avoid). 2909 */ 2910 vtnet_txq_disable_intr(txq); 2911 return; 2912 } 2913 2914 #ifdef DEV_NETMAP 2915 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS) 2916 return; 2917 #endif /* DEV_NETMAP */ 2918 2919 VTNET_TXQ_LOCK(txq); 2920 2921 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) { 2922 VTNET_TXQ_UNLOCK(txq); 2923 return; 2924 } 2925 2926 vtnet_txq_eof(txq); 2927 vtnet_txq_start(txq); 2928 2929 VTNET_TXQ_UNLOCK(txq); 2930 } 2931 2932 static void 2933 vtnet_tx_start_all(struct vtnet_softc *sc) 2934 { 2935 struct vtnet_txq *txq; 2936 int i; 2937 2938 VTNET_CORE_LOCK_ASSERT(sc); 2939 2940 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2941 txq = &sc->vtnet_txqs[i]; 2942 2943 VTNET_TXQ_LOCK(txq); 2944 vtnet_txq_start(txq); 2945 VTNET_TXQ_UNLOCK(txq); 2946 } 2947 } 2948 2949 static void 2950 vtnet_qflush(if_t ifp) 2951 { 2952 struct vtnet_softc *sc; 2953 struct vtnet_txq *txq; 2954 struct mbuf *m; 2955 int i; 2956 2957 sc = if_getsoftc(ifp); 2958 2959 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 2960 txq = &sc->vtnet_txqs[i]; 2961 2962 VTNET_TXQ_LOCK(txq); 2963 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL) 2964 m_freem(m); 2965 VTNET_TXQ_UNLOCK(txq); 2966 } 2967 2968 if_qflush(ifp); 2969 } 2970 2971 static int 2972 vtnet_watchdog(struct vtnet_txq *txq) 2973 { 2974 if_t ifp; 2975 2976 ifp = txq->vtntx_sc->vtnet_ifp; 2977 2978 VTNET_TXQ_LOCK(txq); 2979 if (txq->vtntx_watchdog == 1) { 2980 /* 2981 * Only drain completed frames if the watchdog is about to 2982 * expire. If any frames were drained, there may be enough 2983 * free descriptors now available to transmit queued frames. 2984 * In that case, the timer will immediately be decremented 2985 * below, but the timeout is generous enough that should not 2986 * be a problem. 2987 */ 2988 if (vtnet_txq_eof(txq) != 0) 2989 vtnet_txq_start(txq); 2990 } 2991 2992 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) { 2993 VTNET_TXQ_UNLOCK(txq); 2994 return (0); 2995 } 2996 VTNET_TXQ_UNLOCK(txq); 2997 2998 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id); 2999 return (1); 3000 } 3001 3002 static void 3003 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc, 3004 struct vtnet_txq_stats *txacc) 3005 { 3006 3007 bzero(rxacc, sizeof(struct vtnet_rxq_stats)); 3008 bzero(txacc, sizeof(struct vtnet_txq_stats)); 3009 3010 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3011 struct vtnet_rxq_stats *rxst; 3012 struct vtnet_txq_stats *txst; 3013 3014 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 3015 rxacc->vrxs_ipackets += rxst->vrxs_ipackets; 3016 rxacc->vrxs_ibytes += rxst->vrxs_ibytes; 3017 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops; 3018 rxacc->vrxs_csum += rxst->vrxs_csum; 3019 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed; 3020 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled; 3021 3022 txst = &sc->vtnet_txqs[i].vtntx_stats; 3023 txacc->vtxs_opackets += txst->vtxs_opackets; 3024 txacc->vtxs_obytes += txst->vtxs_obytes; 3025 txacc->vtxs_csum += txst->vtxs_csum; 3026 txacc->vtxs_tso += txst->vtxs_tso; 3027 txacc->vtxs_rescheduled += txst->vtxs_rescheduled; 3028 } 3029 } 3030 3031 static uint64_t 3032 vtnet_get_counter(if_t ifp, ift_counter cnt) 3033 { 3034 struct vtnet_softc *sc; 3035 struct vtnet_rxq_stats rxaccum; 3036 struct vtnet_txq_stats txaccum; 3037 3038 sc = if_getsoftc(ifp); 3039 vtnet_accum_stats(sc, &rxaccum, &txaccum); 3040 3041 switch (cnt) { 3042 case IFCOUNTER_IPACKETS: 3043 return (rxaccum.vrxs_ipackets); 3044 case IFCOUNTER_IQDROPS: 3045 return (rxaccum.vrxs_iqdrops); 3046 case IFCOUNTER_IERRORS: 3047 return (rxaccum.vrxs_ierrors); 3048 case IFCOUNTER_IBYTES: 3049 return (rxaccum.vrxs_ibytes); 3050 case IFCOUNTER_OPACKETS: 3051 return (txaccum.vtxs_opackets); 3052 case IFCOUNTER_OBYTES: 3053 return (txaccum.vtxs_obytes); 3054 case IFCOUNTER_OMCASTS: 3055 return (txaccum.vtxs_omcasts); 3056 default: 3057 return (if_get_counter_default(ifp, cnt)); 3058 } 3059 } 3060 3061 static void 3062 vtnet_tick(void *xsc) 3063 { 3064 struct vtnet_softc *sc; 3065 if_t ifp; 3066 int i, timedout; 3067 3068 sc = xsc; 3069 ifp = sc->vtnet_ifp; 3070 timedout = 0; 3071 3072 VTNET_CORE_LOCK_ASSERT(sc); 3073 3074 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 3075 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]); 3076 3077 if (timedout != 0) { 3078 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3079 vtnet_init_locked(sc, 0); 3080 } else 3081 callout_schedule(&sc->vtnet_tick_ch, hz); 3082 } 3083 3084 static void 3085 vtnet_start_taskqueues(struct vtnet_softc *sc) 3086 { 3087 device_t dev; 3088 struct vtnet_rxq *rxq; 3089 struct vtnet_txq *txq; 3090 int i, error; 3091 3092 dev = sc->vtnet_dev; 3093 3094 /* 3095 * Errors here are very difficult to recover from - we cannot 3096 * easily fail because, if this is during boot, we will hang 3097 * when freeing any successfully started taskqueues because 3098 * the scheduler isn't up yet. 3099 * 3100 * Most drivers just ignore the return value - it only fails 3101 * with ENOMEM so an error is not likely. 3102 */ 3103 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 3104 rxq = &sc->vtnet_rxqs[i]; 3105 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET, 3106 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id); 3107 if (error) { 3108 device_printf(dev, "failed to start rx taskq %d\n", 3109 rxq->vtnrx_id); 3110 } 3111 3112 txq = &sc->vtnet_txqs[i]; 3113 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET, 3114 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id); 3115 if (error) { 3116 device_printf(dev, "failed to start tx taskq %d\n", 3117 txq->vtntx_id); 3118 } 3119 } 3120 } 3121 3122 static void 3123 vtnet_free_taskqueues(struct vtnet_softc *sc) 3124 { 3125 struct vtnet_rxq *rxq; 3126 struct vtnet_txq *txq; 3127 int i; 3128 3129 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3130 rxq = &sc->vtnet_rxqs[i]; 3131 if (rxq->vtnrx_tq != NULL) { 3132 taskqueue_free(rxq->vtnrx_tq); 3133 rxq->vtnrx_tq = NULL; 3134 } 3135 3136 txq = &sc->vtnet_txqs[i]; 3137 if (txq->vtntx_tq != NULL) { 3138 taskqueue_free(txq->vtntx_tq); 3139 txq->vtntx_tq = NULL; 3140 } 3141 } 3142 } 3143 3144 static void 3145 vtnet_drain_taskqueues(struct vtnet_softc *sc) 3146 { 3147 struct vtnet_rxq *rxq; 3148 struct vtnet_txq *txq; 3149 int i; 3150 3151 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3152 rxq = &sc->vtnet_rxqs[i]; 3153 if (rxq->vtnrx_tq != NULL) 3154 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 3155 3156 txq = &sc->vtnet_txqs[i]; 3157 if (txq->vtntx_tq != NULL) { 3158 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask); 3159 if (!VTNET_ALTQ_ENABLED) 3160 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask); 3161 } 3162 } 3163 } 3164 3165 static void 3166 vtnet_drain_rxtx_queues(struct vtnet_softc *sc) 3167 { 3168 struct vtnet_rxq *rxq; 3169 struct vtnet_txq *txq; 3170 int i; 3171 3172 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3173 rxq = &sc->vtnet_rxqs[i]; 3174 vtnet_rxq_free_mbufs(rxq); 3175 3176 txq = &sc->vtnet_txqs[i]; 3177 vtnet_txq_free_mbufs(txq); 3178 } 3179 } 3180 3181 static void 3182 vtnet_stop_rendezvous(struct vtnet_softc *sc) 3183 { 3184 struct vtnet_rxq *rxq; 3185 struct vtnet_txq *txq; 3186 int i; 3187 3188 VTNET_CORE_LOCK_ASSERT(sc); 3189 3190 /* 3191 * Lock and unlock the per-queue mutex so we known the stop 3192 * state is visible. Doing only the active queues should be 3193 * sufficient, but it does not cost much extra to do all the 3194 * queues. 3195 */ 3196 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 3197 rxq = &sc->vtnet_rxqs[i]; 3198 VTNET_RXQ_LOCK(rxq); 3199 VTNET_RXQ_UNLOCK(rxq); 3200 3201 txq = &sc->vtnet_txqs[i]; 3202 VTNET_TXQ_LOCK(txq); 3203 VTNET_TXQ_UNLOCK(txq); 3204 } 3205 } 3206 3207 static void 3208 vtnet_stop(struct vtnet_softc *sc) 3209 { 3210 device_t dev; 3211 if_t ifp; 3212 3213 dev = sc->vtnet_dev; 3214 ifp = sc->vtnet_ifp; 3215 3216 VTNET_CORE_LOCK_ASSERT(sc); 3217 3218 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3219 sc->vtnet_link_active = 0; 3220 callout_stop(&sc->vtnet_tick_ch); 3221 3222 /* Only advisory. */ 3223 vtnet_disable_interrupts(sc); 3224 3225 #ifdef DEV_NETMAP 3226 /* Stop any pending txsync/rxsync and disable them. */ 3227 netmap_disable_all_rings(ifp); 3228 #endif /* DEV_NETMAP */ 3229 3230 /* 3231 * Stop the host adapter. This resets it to the pre-initialized 3232 * state. It will not generate any interrupts until after it is 3233 * reinitialized. 3234 */ 3235 virtio_stop(dev); 3236 vtnet_stop_rendezvous(sc); 3237 3238 vtnet_drain_rxtx_queues(sc); 3239 sc->vtnet_act_vq_pairs = 1; 3240 } 3241 3242 static int 3243 vtnet_virtio_reinit(struct vtnet_softc *sc) 3244 { 3245 device_t dev; 3246 if_t ifp; 3247 uint64_t features; 3248 int error; 3249 3250 dev = sc->vtnet_dev; 3251 ifp = sc->vtnet_ifp; 3252 features = sc->vtnet_negotiated_features; 3253 3254 /* 3255 * Re-negotiate with the host, removing any disabled receive 3256 * features. Transmit features are disabled only on our side 3257 * via if_capenable and if_hwassist. 3258 */ 3259 3260 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0) 3261 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES); 3262 3263 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0) 3264 features &= ~VTNET_LRO_FEATURES; 3265 3266 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0) 3267 features &= ~VIRTIO_NET_F_CTRL_VLAN; 3268 3269 error = virtio_reinit(dev, features); 3270 if (error) { 3271 device_printf(dev, "virtio reinit error %d\n", error); 3272 return (error); 3273 } 3274 3275 sc->vtnet_features = features; 3276 virtio_reinit_complete(dev); 3277 3278 return (0); 3279 } 3280 3281 static void 3282 vtnet_init_rx_filters(struct vtnet_softc *sc) 3283 { 3284 if_t ifp; 3285 3286 ifp = sc->vtnet_ifp; 3287 3288 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 3289 vtnet_rx_filter(sc); 3290 vtnet_rx_filter_mac(sc); 3291 } 3292 3293 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) 3294 vtnet_rx_filter_vlan(sc); 3295 } 3296 3297 static int 3298 vtnet_init_rx_queues(struct vtnet_softc *sc) 3299 { 3300 device_t dev; 3301 if_t ifp; 3302 struct vtnet_rxq *rxq; 3303 int i, clustersz, error; 3304 3305 dev = sc->vtnet_dev; 3306 ifp = sc->vtnet_ifp; 3307 3308 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp)); 3309 sc->vtnet_rx_clustersz = clustersz; 3310 3311 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) { 3312 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) + 3313 VTNET_MAX_RX_SIZE, clustersz); 3314 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs, 3315 ("%s: too many rx mbufs %d for %d segments", __func__, 3316 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs)); 3317 } else 3318 sc->vtnet_rx_nmbufs = 1; 3319 3320 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3321 rxq = &sc->vtnet_rxqs[i]; 3322 3323 /* Hold the lock to satisfy asserts. */ 3324 VTNET_RXQ_LOCK(rxq); 3325 error = vtnet_rxq_populate(rxq); 3326 VTNET_RXQ_UNLOCK(rxq); 3327 3328 if (error) { 3329 device_printf(dev, "cannot populate Rx queue %d\n", i); 3330 return (error); 3331 } 3332 } 3333 3334 return (0); 3335 } 3336 3337 static int 3338 vtnet_init_tx_queues(struct vtnet_softc *sc) 3339 { 3340 struct vtnet_txq *txq; 3341 int i; 3342 3343 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 3344 txq = &sc->vtnet_txqs[i]; 3345 txq->vtntx_watchdog = 0; 3346 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq); 3347 #ifdef DEV_NETMAP 3348 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0); 3349 #endif /* DEV_NETMAP */ 3350 } 3351 3352 return (0); 3353 } 3354 3355 static int 3356 vtnet_init_rxtx_queues(struct vtnet_softc *sc) 3357 { 3358 int error; 3359 3360 error = vtnet_init_rx_queues(sc); 3361 if (error) 3362 return (error); 3363 3364 error = vtnet_init_tx_queues(sc); 3365 if (error) 3366 return (error); 3367 3368 return (0); 3369 } 3370 3371 static void 3372 vtnet_set_active_vq_pairs(struct vtnet_softc *sc) 3373 { 3374 device_t dev; 3375 int npairs; 3376 3377 dev = sc->vtnet_dev; 3378 3379 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) { 3380 sc->vtnet_act_vq_pairs = 1; 3381 return; 3382 } 3383 3384 npairs = sc->vtnet_req_vq_pairs; 3385 3386 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) { 3387 device_printf(dev, "cannot set active queue pairs to %d, " 3388 "falling back to 1 queue pair\n", npairs); 3389 npairs = 1; 3390 } 3391 3392 sc->vtnet_act_vq_pairs = npairs; 3393 } 3394 3395 static void 3396 vtnet_update_rx_offloads(struct vtnet_softc *sc) 3397 { 3398 if_t ifp; 3399 uint64_t features; 3400 int error; 3401 3402 ifp = sc->vtnet_ifp; 3403 features = sc->vtnet_features; 3404 3405 VTNET_CORE_LOCK_ASSERT(sc); 3406 3407 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) { 3408 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) 3409 features |= VIRTIO_NET_F_GUEST_CSUM; 3410 else 3411 features &= ~VIRTIO_NET_F_GUEST_CSUM; 3412 } 3413 3414 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) { 3415 if (if_getcapenable(ifp) & IFCAP_LRO) 3416 features |= VTNET_LRO_FEATURES; 3417 else 3418 features &= ~VTNET_LRO_FEATURES; 3419 } 3420 3421 error = vtnet_ctrl_guest_offloads(sc, 3422 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 | 3423 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN | 3424 VIRTIO_NET_F_GUEST_UFO)); 3425 if (error) { 3426 device_printf(sc->vtnet_dev, 3427 "%s: cannot update Rx features\n", __func__); 3428 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) { 3429 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); 3430 vtnet_init_locked(sc, 0); 3431 } 3432 } else 3433 sc->vtnet_features = features; 3434 } 3435 3436 static int 3437 vtnet_reinit(struct vtnet_softc *sc) 3438 { 3439 if_t ifp; 3440 int error; 3441 3442 ifp = sc->vtnet_ifp; 3443 3444 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 3445 3446 error = vtnet_virtio_reinit(sc); 3447 if (error) 3448 return (error); 3449 3450 vtnet_set_macaddr(sc); 3451 vtnet_set_active_vq_pairs(sc); 3452 3453 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) 3454 vtnet_init_rx_filters(sc); 3455 3456 if_sethwassist(ifp, 0); 3457 if (if_getcapenable(ifp) & IFCAP_TXCSUM) 3458 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0); 3459 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6) 3460 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0); 3461 if (if_getcapenable(ifp) & IFCAP_TSO4) 3462 if_sethwassistbits(ifp, CSUM_IP_TSO, 0); 3463 if (if_getcapenable(ifp) & IFCAP_TSO6) 3464 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0); 3465 3466 error = vtnet_init_rxtx_queues(sc); 3467 if (error) 3468 return (error); 3469 3470 return (0); 3471 } 3472 3473 static void 3474 vtnet_init_locked(struct vtnet_softc *sc, int init_mode) 3475 { 3476 if_t ifp; 3477 3478 ifp = sc->vtnet_ifp; 3479 3480 VTNET_CORE_LOCK_ASSERT(sc); 3481 3482 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) 3483 return; 3484 3485 vtnet_stop(sc); 3486 3487 #ifdef DEV_NETMAP 3488 /* Once stopped we can update the netmap flags, if necessary. */ 3489 switch (init_mode) { 3490 case VTNET_INIT_NETMAP_ENTER: 3491 nm_set_native_flags(NA(ifp)); 3492 break; 3493 case VTNET_INIT_NETMAP_EXIT: 3494 nm_clear_native_flags(NA(ifp)); 3495 break; 3496 } 3497 #endif /* DEV_NETMAP */ 3498 3499 if (vtnet_reinit(sc) != 0) { 3500 vtnet_stop(sc); 3501 return; 3502 } 3503 3504 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0); 3505 vtnet_update_link_status(sc); 3506 vtnet_enable_interrupts(sc); 3507 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 3508 3509 #ifdef DEV_NETMAP 3510 /* Re-enable txsync/rxsync. */ 3511 netmap_enable_all_rings(ifp); 3512 #endif /* DEV_NETMAP */ 3513 } 3514 3515 static void 3516 vtnet_init(void *xsc) 3517 { 3518 struct vtnet_softc *sc; 3519 3520 sc = xsc; 3521 3522 VTNET_CORE_LOCK(sc); 3523 vtnet_init_locked(sc, 0); 3524 VTNET_CORE_UNLOCK(sc); 3525 } 3526 3527 static void 3528 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 3529 { 3530 3531 /* 3532 * The control virtqueue is only polled and therefore it should 3533 * already be empty. 3534 */ 3535 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 3536 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq)); 3537 } 3538 3539 static void 3540 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 3541 struct sglist *sg, int readable, int writable) 3542 { 3543 struct virtqueue *vq; 3544 3545 vq = sc->vtnet_ctrl_vq; 3546 3547 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ); 3548 VTNET_CORE_LOCK_ASSERT(sc); 3549 3550 if (!virtqueue_empty(vq)) 3551 return; 3552 3553 /* 3554 * Poll for the response, but the command is likely completed before 3555 * returning from the notify. 3556 */ 3557 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) { 3558 virtqueue_notify(vq); 3559 virtqueue_poll(vq, NULL); 3560 } 3561 } 3562 3563 static int 3564 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 3565 { 3566 struct sglist_seg segs[3]; 3567 struct sglist sg; 3568 struct { 3569 struct virtio_net_ctrl_hdr hdr __aligned(2); 3570 uint8_t pad1; 3571 uint8_t addr[ETHER_ADDR_LEN] __aligned(8); 3572 uint8_t pad2; 3573 uint8_t ack; 3574 } s; 3575 int error; 3576 3577 error = 0; 3578 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC); 3579 3580 s.hdr.class = VIRTIO_NET_CTRL_MAC; 3581 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 3582 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN); 3583 s.ack = VIRTIO_NET_ERR; 3584 3585 sglist_init(&sg, nitems(segs), segs); 3586 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3587 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN); 3588 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3589 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3590 3591 if (error == 0) 3592 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3593 3594 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3595 } 3596 3597 static int 3598 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads) 3599 { 3600 struct sglist_seg segs[3]; 3601 struct sglist sg; 3602 struct { 3603 struct virtio_net_ctrl_hdr hdr __aligned(2); 3604 uint8_t pad1; 3605 uint64_t offloads __aligned(8); 3606 uint8_t pad2; 3607 uint8_t ack; 3608 } s; 3609 int error; 3610 3611 error = 0; 3612 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); 3613 3614 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS; 3615 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET; 3616 s.offloads = vtnet_gtoh64(sc, offloads); 3617 s.ack = VIRTIO_NET_ERR; 3618 3619 sglist_init(&sg, nitems(segs), segs); 3620 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3621 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t)); 3622 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3623 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3624 3625 if (error == 0) 3626 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3627 3628 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3629 } 3630 3631 static int 3632 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs) 3633 { 3634 struct sglist_seg segs[3]; 3635 struct sglist sg; 3636 struct { 3637 struct virtio_net_ctrl_hdr hdr __aligned(2); 3638 uint8_t pad1; 3639 struct virtio_net_ctrl_mq mq __aligned(2); 3640 uint8_t pad2; 3641 uint8_t ack; 3642 } s; 3643 int error; 3644 3645 error = 0; 3646 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ); 3647 3648 s.hdr.class = VIRTIO_NET_CTRL_MQ; 3649 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET; 3650 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs); 3651 s.ack = VIRTIO_NET_ERR; 3652 3653 sglist_init(&sg, nitems(segs), segs); 3654 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3655 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq)); 3656 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3657 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3658 3659 if (error == 0) 3660 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3661 3662 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3663 } 3664 3665 static int 3666 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on) 3667 { 3668 struct sglist_seg segs[3]; 3669 struct sglist sg; 3670 struct { 3671 struct virtio_net_ctrl_hdr hdr __aligned(2); 3672 uint8_t pad1; 3673 uint8_t onoff; 3674 uint8_t pad2; 3675 uint8_t ack; 3676 } s; 3677 int error; 3678 3679 error = 0; 3680 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3681 3682 s.hdr.class = VIRTIO_NET_CTRL_RX; 3683 s.hdr.cmd = cmd; 3684 s.onoff = on; 3685 s.ack = VIRTIO_NET_ERR; 3686 3687 sglist_init(&sg, nitems(segs), segs); 3688 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3689 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t)); 3690 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3691 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3692 3693 if (error == 0) 3694 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3695 3696 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3697 } 3698 3699 static int 3700 vtnet_set_promisc(struct vtnet_softc *sc, bool on) 3701 { 3702 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 3703 } 3704 3705 static int 3706 vtnet_set_allmulti(struct vtnet_softc *sc, bool on) 3707 { 3708 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 3709 } 3710 3711 static void 3712 vtnet_rx_filter(struct vtnet_softc *sc) 3713 { 3714 device_t dev; 3715 if_t ifp; 3716 3717 dev = sc->vtnet_dev; 3718 ifp = sc->vtnet_ifp; 3719 3720 VTNET_CORE_LOCK_ASSERT(sc); 3721 3722 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) { 3723 device_printf(dev, "cannot %s promiscuous mode\n", 3724 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable"); 3725 } 3726 3727 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) { 3728 device_printf(dev, "cannot %s all-multicast mode\n", 3729 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable"); 3730 } 3731 } 3732 3733 static u_int 3734 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt) 3735 { 3736 struct vtnet_softc *sc = arg; 3737 3738 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0) 3739 return (0); 3740 3741 if (ucnt < VTNET_MAX_MAC_ENTRIES) 3742 bcopy(LLADDR(sdl), 3743 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt], 3744 ETHER_ADDR_LEN); 3745 3746 return (1); 3747 } 3748 3749 static u_int 3750 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt) 3751 { 3752 struct vtnet_mac_filter *filter = arg; 3753 3754 if (mcnt < VTNET_MAX_MAC_ENTRIES) 3755 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt], 3756 ETHER_ADDR_LEN); 3757 3758 return (1); 3759 } 3760 3761 static void 3762 vtnet_rx_filter_mac(struct vtnet_softc *sc) 3763 { 3764 struct virtio_net_ctrl_hdr hdr __aligned(2); 3765 struct vtnet_mac_filter *filter; 3766 struct sglist_seg segs[4]; 3767 struct sglist sg; 3768 if_t ifp; 3769 bool promisc, allmulti; 3770 u_int ucnt, mcnt; 3771 int error; 3772 uint8_t ack; 3773 3774 ifp = sc->vtnet_ifp; 3775 filter = sc->vtnet_mac_filter; 3776 error = 0; 3777 3778 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX); 3779 VTNET_CORE_LOCK_ASSERT(sc); 3780 3781 /* Unicast MAC addresses: */ 3782 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc); 3783 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES); 3784 3785 if (promisc) { 3786 ucnt = 0; 3787 if_printf(ifp, "more than %d MAC addresses assigned, " 3788 "falling back to promiscuous mode\n", 3789 VTNET_MAX_MAC_ENTRIES); 3790 } 3791 3792 /* Multicast MAC addresses: */ 3793 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter); 3794 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES); 3795 3796 if (allmulti) { 3797 mcnt = 0; 3798 if_printf(ifp, "more than %d multicast MAC addresses " 3799 "assigned, falling back to all-multicast mode\n", 3800 VTNET_MAX_MAC_ENTRIES); 3801 } 3802 3803 if (promisc && allmulti) 3804 goto out; 3805 3806 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt); 3807 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt); 3808 3809 hdr.class = VIRTIO_NET_CTRL_MAC; 3810 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 3811 ack = VIRTIO_NET_ERR; 3812 3813 sglist_init(&sg, nitems(segs), segs); 3814 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 3815 error |= sglist_append(&sg, &filter->vmf_unicast, 3816 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN); 3817 error |= sglist_append(&sg, &filter->vmf_multicast, 3818 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN); 3819 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 3820 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3821 3822 if (error == 0) 3823 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 3824 if (ack != VIRTIO_NET_OK) 3825 if_printf(ifp, "error setting host MAC filter table\n"); 3826 3827 out: 3828 if (promisc && vtnet_set_promisc(sc, true) != 0) 3829 if_printf(ifp, "cannot enable promiscuous mode\n"); 3830 if (allmulti && vtnet_set_allmulti(sc, true) != 0) 3831 if_printf(ifp, "cannot enable all-multicast mode\n"); 3832 } 3833 3834 static int 3835 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3836 { 3837 struct sglist_seg segs[3]; 3838 struct sglist sg; 3839 struct { 3840 struct virtio_net_ctrl_hdr hdr __aligned(2); 3841 uint8_t pad1; 3842 uint16_t tag __aligned(2); 3843 uint8_t pad2; 3844 uint8_t ack; 3845 } s; 3846 int error; 3847 3848 error = 0; 3849 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3850 3851 s.hdr.class = VIRTIO_NET_CTRL_VLAN; 3852 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 3853 s.tag = vtnet_gtoh16(sc, tag); 3854 s.ack = VIRTIO_NET_ERR; 3855 3856 sglist_init(&sg, nitems(segs), segs); 3857 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr)); 3858 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t)); 3859 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 3860 MPASS(error == 0 && sg.sg_nseg == nitems(segs)); 3861 3862 if (error == 0) 3863 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 3864 3865 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 3866 } 3867 3868 static void 3869 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 3870 { 3871 int i, bit; 3872 uint32_t w; 3873 uint16_t tag; 3874 3875 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER); 3876 VTNET_CORE_LOCK_ASSERT(sc); 3877 3878 /* Enable the filter for each configured VLAN. */ 3879 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) { 3880 w = sc->vtnet_vlan_filter[i]; 3881 3882 while ((bit = ffs(w) - 1) != -1) { 3883 w &= ~(1 << bit); 3884 tag = sizeof(w) * CHAR_BIT * i + bit; 3885 3886 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) { 3887 device_printf(sc->vtnet_dev, 3888 "cannot enable VLAN %d filter\n", tag); 3889 } 3890 } 3891 } 3892 } 3893 3894 static void 3895 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 3896 { 3897 if_t ifp; 3898 int idx, bit; 3899 3900 ifp = sc->vtnet_ifp; 3901 idx = (tag >> 5) & 0x7F; 3902 bit = tag & 0x1F; 3903 3904 if (tag == 0 || tag > 4095) 3905 return; 3906 3907 VTNET_CORE_LOCK(sc); 3908 3909 if (add) 3910 sc->vtnet_vlan_filter[idx] |= (1 << bit); 3911 else 3912 sc->vtnet_vlan_filter[idx] &= ~(1 << bit); 3913 3914 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER && 3915 if_getdrvflags(ifp) & IFF_DRV_RUNNING && 3916 vtnet_exec_vlan_filter(sc, add, tag) != 0) { 3917 device_printf(sc->vtnet_dev, 3918 "cannot %s VLAN %d %s the host filter table\n", 3919 add ? "add" : "remove", tag, add ? "to" : "from"); 3920 } 3921 3922 VTNET_CORE_UNLOCK(sc); 3923 } 3924 3925 static void 3926 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag) 3927 { 3928 3929 if (if_getsoftc(ifp) != arg) 3930 return; 3931 3932 vtnet_update_vlan_filter(arg, 1, tag); 3933 } 3934 3935 static void 3936 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag) 3937 { 3938 3939 if (if_getsoftc(ifp) != arg) 3940 return; 3941 3942 vtnet_update_vlan_filter(arg, 0, tag); 3943 } 3944 3945 static void 3946 vtnet_update_speed_duplex(struct vtnet_softc *sc) 3947 { 3948 if_t ifp; 3949 uint32_t speed; 3950 3951 ifp = sc->vtnet_ifp; 3952 3953 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0) 3954 return; 3955 3956 /* BMV: Ignore duplex. */ 3957 speed = virtio_read_dev_config_4(sc->vtnet_dev, 3958 offsetof(struct virtio_net_config, speed)); 3959 if (speed != UINT32_MAX) 3960 if_setbaudrate(ifp, IF_Mbps(speed)); 3961 } 3962 3963 static int 3964 vtnet_is_link_up(struct vtnet_softc *sc) 3965 { 3966 uint16_t status; 3967 3968 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0) 3969 return (1); 3970 3971 status = virtio_read_dev_config_2(sc->vtnet_dev, 3972 offsetof(struct virtio_net_config, status)); 3973 3974 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 3975 } 3976 3977 static void 3978 vtnet_update_link_status(struct vtnet_softc *sc) 3979 { 3980 if_t ifp; 3981 int link; 3982 3983 ifp = sc->vtnet_ifp; 3984 VTNET_CORE_LOCK_ASSERT(sc); 3985 link = vtnet_is_link_up(sc); 3986 3987 /* Notify if the link status has changed. */ 3988 if (link != 0 && sc->vtnet_link_active == 0) { 3989 vtnet_update_speed_duplex(sc); 3990 sc->vtnet_link_active = 1; 3991 if_link_state_change(ifp, LINK_STATE_UP); 3992 } else if (link == 0 && sc->vtnet_link_active != 0) { 3993 sc->vtnet_link_active = 0; 3994 if_link_state_change(ifp, LINK_STATE_DOWN); 3995 } 3996 } 3997 3998 static int 3999 vtnet_ifmedia_upd(if_t ifp __unused) 4000 { 4001 return (EOPNOTSUPP); 4002 } 4003 4004 static void 4005 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr) 4006 { 4007 struct vtnet_softc *sc; 4008 4009 sc = if_getsoftc(ifp); 4010 4011 ifmr->ifm_status = IFM_AVALID; 4012 ifmr->ifm_active = IFM_ETHER; 4013 4014 VTNET_CORE_LOCK(sc); 4015 if (vtnet_is_link_up(sc) != 0) { 4016 ifmr->ifm_status |= IFM_ACTIVE; 4017 ifmr->ifm_active |= IFM_10G_T | IFM_FDX; 4018 } else 4019 ifmr->ifm_active |= IFM_NONE; 4020 VTNET_CORE_UNLOCK(sc); 4021 } 4022 4023 static void 4024 vtnet_get_macaddr(struct vtnet_softc *sc) 4025 { 4026 4027 if (sc->vtnet_flags & VTNET_FLAG_MAC) { 4028 virtio_read_device_config_array(sc->vtnet_dev, 4029 offsetof(struct virtio_net_config, mac), 4030 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN); 4031 } else { 4032 /* Generate a random locally administered unicast address. */ 4033 sc->vtnet_hwaddr[0] = 0xB2; 4034 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0); 4035 } 4036 } 4037 4038 static void 4039 vtnet_set_macaddr(struct vtnet_softc *sc) 4040 { 4041 device_t dev; 4042 int error; 4043 4044 dev = sc->vtnet_dev; 4045 4046 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) { 4047 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr); 4048 if (error) 4049 device_printf(dev, "unable to set MAC address\n"); 4050 return; 4051 } 4052 4053 /* MAC in config is read-only in modern VirtIO. */ 4054 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) { 4055 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4056 virtio_write_dev_config_1(dev, 4057 offsetof(struct virtio_net_config, mac) + i, 4058 sc->vtnet_hwaddr[i]); 4059 } 4060 } 4061 } 4062 4063 static void 4064 vtnet_attached_set_macaddr(struct vtnet_softc *sc) 4065 { 4066 4067 /* Assign MAC address if it was generated. */ 4068 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) 4069 vtnet_set_macaddr(sc); 4070 } 4071 4072 static void 4073 vtnet_vlan_tag_remove(struct mbuf *m) 4074 { 4075 struct ether_vlan_header *evh; 4076 4077 evh = mtod(m, struct ether_vlan_header *); 4078 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 4079 m->m_flags |= M_VLANTAG; 4080 4081 /* Strip the 802.1Q header. */ 4082 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 4083 ETHER_HDR_LEN - ETHER_TYPE_LEN); 4084 m_adj(m, ETHER_VLAN_ENCAP_LEN); 4085 } 4086 4087 static void 4088 vtnet_set_rx_process_limit(struct vtnet_softc *sc) 4089 { 4090 int limit; 4091 4092 limit = vtnet_tunable_int(sc, "rx_process_limit", 4093 vtnet_rx_process_limit); 4094 if (limit < 0) 4095 limit = INT_MAX; 4096 sc->vtnet_rx_process_limit = limit; 4097 } 4098 4099 static void 4100 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx, 4101 struct sysctl_oid_list *child, struct vtnet_rxq *rxq) 4102 { 4103 struct sysctl_oid *node; 4104 struct sysctl_oid_list *list; 4105 struct vtnet_rxq_stats *stats; 4106 char namebuf[16]; 4107 4108 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id); 4109 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4110 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue"); 4111 list = SYSCTL_CHILDREN(node); 4112 4113 stats = &rxq->vtnrx_stats; 4114 4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", 4116 CTLFLAG_RD | CTLFLAG_STATS, 4117 &stats->vrxs_ipackets, "Receive packets"); 4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", 4119 CTLFLAG_RD | CTLFLAG_STATS, 4120 &stats->vrxs_ibytes, "Receive bytes"); 4121 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", 4122 CTLFLAG_RD | CTLFLAG_STATS, 4123 &stats->vrxs_iqdrops, "Receive drops"); 4124 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", 4125 CTLFLAG_RD | CTLFLAG_STATS, 4126 &stats->vrxs_ierrors, "Receive errors"); 4127 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", 4128 CTLFLAG_RD | CTLFLAG_STATS, 4129 &stats->vrxs_csum, "Receive checksum offloaded"); 4130 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", 4131 CTLFLAG_RD | CTLFLAG_STATS, 4132 &stats->vrxs_csum_failed, "Receive checksum offload failed"); 4133 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", 4134 CTLFLAG_RD | CTLFLAG_STATS, 4135 &stats->vrxs_host_lro, "Receive host segmentation offloaded"); 4136 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", 4137 CTLFLAG_RD | CTLFLAG_STATS, 4138 &stats->vrxs_rescheduled, 4139 "Receive interrupt handler rescheduled"); 4140 } 4141 4142 static void 4143 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx, 4144 struct sysctl_oid_list *child, struct vtnet_txq *txq) 4145 { 4146 struct sysctl_oid *node; 4147 struct sysctl_oid_list *list; 4148 struct vtnet_txq_stats *stats; 4149 char namebuf[16]; 4150 4151 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id); 4152 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf, 4153 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue"); 4154 list = SYSCTL_CHILDREN(node); 4155 4156 stats = &txq->vtntx_stats; 4157 4158 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", 4159 CTLFLAG_RD | CTLFLAG_STATS, 4160 &stats->vtxs_opackets, "Transmit packets"); 4161 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", 4162 CTLFLAG_RD | CTLFLAG_STATS, 4163 &stats->vtxs_obytes, "Transmit bytes"); 4164 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", 4165 CTLFLAG_RD | CTLFLAG_STATS, 4166 &stats->vtxs_omcasts, "Transmit multicasts"); 4167 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", 4168 CTLFLAG_RD | CTLFLAG_STATS, 4169 &stats->vtxs_csum, "Transmit checksum offloaded"); 4170 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", 4171 CTLFLAG_RD | CTLFLAG_STATS, 4172 &stats->vtxs_tso, "Transmit TCP segmentation offloaded"); 4173 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", 4174 CTLFLAG_RD | CTLFLAG_STATS, 4175 &stats->vtxs_rescheduled, 4176 "Transmit interrupt handler rescheduled"); 4177 } 4178 4179 static void 4180 vtnet_setup_queue_sysctl(struct vtnet_softc *sc) 4181 { 4182 device_t dev; 4183 struct sysctl_ctx_list *ctx; 4184 struct sysctl_oid *tree; 4185 struct sysctl_oid_list *child; 4186 int i; 4187 4188 dev = sc->vtnet_dev; 4189 ctx = device_get_sysctl_ctx(dev); 4190 tree = device_get_sysctl_tree(dev); 4191 child = SYSCTL_CHILDREN(tree); 4192 4193 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) { 4194 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]); 4195 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]); 4196 } 4197 } 4198 4199 static int 4200 vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS) 4201 { 4202 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4203 struct vtnet_statistics *stats = &sc->vtnet_stats; 4204 struct vtnet_rxq_stats *rxst; 4205 int i; 4206 4207 stats->rx_csum_failed = 0; 4208 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4209 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4210 stats->rx_csum_failed += rxst->vrxs_csum_failed; 4211 } 4212 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_failed, req)); 4213 } 4214 4215 static int 4216 vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS) 4217 { 4218 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4219 struct vtnet_statistics *stats = &sc->vtnet_stats; 4220 struct vtnet_rxq_stats *rxst; 4221 int i; 4222 4223 stats->rx_csum_offloaded = 0; 4224 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4225 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4226 stats->rx_csum_offloaded += rxst->vrxs_csum; 4227 } 4228 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_offloaded, req)); 4229 } 4230 4231 static int 4232 vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS) 4233 { 4234 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4235 struct vtnet_statistics *stats = &sc->vtnet_stats; 4236 struct vtnet_rxq_stats *rxst; 4237 int i; 4238 4239 stats->rx_task_rescheduled = 0; 4240 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4241 rxst = &sc->vtnet_rxqs[i].vtnrx_stats; 4242 stats->rx_task_rescheduled += rxst->vrxs_rescheduled; 4243 } 4244 return (sysctl_handle_64(oidp, NULL, stats->rx_task_rescheduled, req)); 4245 } 4246 4247 static int 4248 vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS) 4249 { 4250 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4251 struct vtnet_statistics *stats = &sc->vtnet_stats; 4252 struct vtnet_txq_stats *txst; 4253 int i; 4254 4255 stats->tx_csum_offloaded = 0; 4256 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4257 txst = &sc->vtnet_txqs[i].vtntx_stats; 4258 stats->tx_csum_offloaded += txst->vtxs_csum; 4259 } 4260 return (sysctl_handle_64(oidp, NULL, stats->tx_csum_offloaded, req)); 4261 } 4262 4263 static int 4264 vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS) 4265 { 4266 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4267 struct vtnet_statistics *stats = &sc->vtnet_stats; 4268 struct vtnet_txq_stats *txst; 4269 int i; 4270 4271 stats->tx_tso_offloaded = 0; 4272 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4273 txst = &sc->vtnet_txqs[i].vtntx_stats; 4274 stats->tx_tso_offloaded += txst->vtxs_tso; 4275 } 4276 return (sysctl_handle_64(oidp, NULL, stats->tx_tso_offloaded, req)); 4277 } 4278 4279 static int 4280 vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS) 4281 { 4282 struct vtnet_softc *sc = (struct vtnet_softc *)arg1; 4283 struct vtnet_statistics *stats = &sc->vtnet_stats; 4284 struct vtnet_txq_stats *txst; 4285 int i; 4286 4287 stats->tx_task_rescheduled = 0; 4288 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) { 4289 txst = &sc->vtnet_txqs[i].vtntx_stats; 4290 stats->tx_task_rescheduled += txst->vtxs_rescheduled; 4291 } 4292 return (sysctl_handle_64(oidp, NULL, stats->tx_task_rescheduled, req)); 4293 } 4294 4295 static void 4296 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx, 4297 struct sysctl_oid_list *child, struct vtnet_softc *sc) 4298 { 4299 struct vtnet_statistics *stats; 4300 struct vtnet_rxq_stats rxaccum; 4301 struct vtnet_txq_stats txaccum; 4302 4303 vtnet_accum_stats(sc, &rxaccum, &txaccum); 4304 4305 stats = &sc->vtnet_stats; 4306 stats->rx_csum_offloaded = rxaccum.vrxs_csum; 4307 stats->rx_csum_failed = rxaccum.vrxs_csum_failed; 4308 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled; 4309 stats->tx_csum_offloaded = txaccum.vtxs_csum; 4310 stats->tx_tso_offloaded = txaccum.vtxs_tso; 4311 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled; 4312 4313 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed", 4314 CTLFLAG_RD | CTLFLAG_STATS, &stats->mbuf_alloc_failed, 4315 "Mbuf cluster allocation failures"); 4316 4317 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large", 4318 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_frame_too_large, 4319 "Received frame larger than the mbuf chain"); 4320 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 4321 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_enq_replacement_failed, 4322 "Enqueuing the replacement receive mbuf failed"); 4323 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed", 4324 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_mergeable_failed, 4325 "Mergeable buffers receive failures"); 4326 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 4327 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ethtype, 4328 "Received checksum offloaded buffer with unsupported " 4329 "Ethernet type"); 4330 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 4331 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ipproto, 4332 "Received checksum offloaded buffer with incorrect IP protocol"); 4333 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset", 4334 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_offset, 4335 "Received checksum offloaded buffer with incorrect offset"); 4336 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_inaccessible_ipproto", 4337 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_inaccessible_ipproto, 4338 "Received checksum offloaded buffer with inaccessible IP protocol"); 4339 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_failed", 4340 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4341 sc, 0, vtnet_sysctl_rx_csum_failed, "QU", 4342 "Received buffer checksum offload failed"); 4343 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_offloaded", 4344 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4345 sc, 0, vtnet_sysctl_rx_csum_offloaded, "QU", 4346 "Received buffer checksum offload succeeded"); 4347 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_task_rescheduled", 4348 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4349 sc, 0, vtnet_sysctl_rx_task_rescheduled, "QU", 4350 "Times the receive interrupt task rescheduled itself"); 4351 4352 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype", 4353 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_unknown_ethtype, 4354 "Aborted transmit of checksum offloaded buffer with unknown " 4355 "Ethernet type"); 4356 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch", 4357 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_proto_mismatch, 4358 "Aborted transmit of checksum offloaded buffer because mismatched " 4359 "protocols"); 4360 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp", 4361 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_not_tcp, 4362 "Aborted transmit of TSO buffer with non TCP protocol"); 4363 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum", 4364 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_without_csum, 4365 "Aborted transmit of TSO buffer without TCP checksum offload"); 4366 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged", 4367 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defragged, 4368 "Transmit mbufs defragged"); 4369 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed", 4370 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defrag_failed, 4371 "Aborted transmit of buffer because defrag failed"); 4372 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_csum_offloaded", 4373 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4374 sc, 0, vtnet_sysctl_tx_csum_offloaded, "QU", 4375 "Offloaded checksum of transmitted buffer"); 4376 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_tso_offloaded", 4377 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4378 sc, 0, vtnet_sysctl_tx_tso_offloaded, "QU", 4379 "Segmentation offload of transmitted buffer"); 4380 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_task_rescheduled", 4381 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS, 4382 sc, 0, vtnet_sysctl_tx_task_rescheduled, "QU", 4383 "Times the transmit interrupt task rescheduled itself"); 4384 } 4385 4386 static void 4387 vtnet_setup_sysctl(struct vtnet_softc *sc) 4388 { 4389 device_t dev; 4390 struct sysctl_ctx_list *ctx; 4391 struct sysctl_oid *tree; 4392 struct sysctl_oid_list *child; 4393 4394 dev = sc->vtnet_dev; 4395 ctx = device_get_sysctl_ctx(dev); 4396 tree = device_get_sysctl_tree(dev); 4397 child = SYSCTL_CHILDREN(tree); 4398 4399 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs", 4400 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0, 4401 "Number of maximum supported virtqueue pairs"); 4402 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs", 4403 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0, 4404 "Number of requested virtqueue pairs"); 4405 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs", 4406 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0, 4407 "Number of active virtqueue pairs"); 4408 4409 vtnet_setup_stat_sysctl(ctx, child, sc); 4410 } 4411 4412 static void 4413 vtnet_load_tunables(struct vtnet_softc *sc) 4414 { 4415 4416 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc, 4417 "lro_entry_count", vtnet_lro_entry_count); 4418 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES) 4419 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES; 4420 4421 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc, 4422 "lro_mbufq_depth", vtnet_lro_mbufq_depth); 4423 } 4424 4425 static int 4426 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq) 4427 { 4428 4429 return (virtqueue_enable_intr(rxq->vtnrx_vq)); 4430 } 4431 4432 static void 4433 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq) 4434 { 4435 4436 virtqueue_disable_intr(rxq->vtnrx_vq); 4437 } 4438 4439 static int 4440 vtnet_txq_enable_intr(struct vtnet_txq *txq) 4441 { 4442 struct virtqueue *vq; 4443 4444 vq = txq->vtntx_vq; 4445 4446 if (vtnet_txq_below_threshold(txq) != 0) 4447 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG)); 4448 4449 /* 4450 * The free count is above our threshold. Keep the Tx interrupt 4451 * disabled until the queue is fuller. 4452 */ 4453 return (0); 4454 } 4455 4456 static void 4457 vtnet_txq_disable_intr(struct vtnet_txq *txq) 4458 { 4459 4460 virtqueue_disable_intr(txq->vtntx_vq); 4461 } 4462 4463 static void 4464 vtnet_enable_rx_interrupts(struct vtnet_softc *sc) 4465 { 4466 struct vtnet_rxq *rxq; 4467 int i; 4468 4469 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) { 4470 rxq = &sc->vtnet_rxqs[i]; 4471 if (vtnet_rxq_enable_intr(rxq) != 0) 4472 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask); 4473 } 4474 } 4475 4476 static void 4477 vtnet_enable_tx_interrupts(struct vtnet_softc *sc) 4478 { 4479 int i; 4480 4481 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4482 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]); 4483 } 4484 4485 static void 4486 vtnet_enable_interrupts(struct vtnet_softc *sc) 4487 { 4488 4489 vtnet_enable_rx_interrupts(sc); 4490 vtnet_enable_tx_interrupts(sc); 4491 } 4492 4493 static void 4494 vtnet_disable_rx_interrupts(struct vtnet_softc *sc) 4495 { 4496 int i; 4497 4498 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4499 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]); 4500 } 4501 4502 static void 4503 vtnet_disable_tx_interrupts(struct vtnet_softc *sc) 4504 { 4505 int i; 4506 4507 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) 4508 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]); 4509 } 4510 4511 static void 4512 vtnet_disable_interrupts(struct vtnet_softc *sc) 4513 { 4514 4515 vtnet_disable_rx_interrupts(sc); 4516 vtnet_disable_tx_interrupts(sc); 4517 } 4518 4519 static int 4520 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def) 4521 { 4522 char path[64]; 4523 4524 snprintf(path, sizeof(path), 4525 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob); 4526 TUNABLE_INT_FETCH(path, &def); 4527 4528 return (def); 4529 } 4530 4531 #ifdef DEBUGNET 4532 static void 4533 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize) 4534 { 4535 struct vtnet_softc *sc; 4536 4537 sc = if_getsoftc(ifp); 4538 4539 VTNET_CORE_LOCK(sc); 4540 *nrxr = sc->vtnet_req_vq_pairs; 4541 *ncl = DEBUGNET_MAX_IN_FLIGHT; 4542 *clsize = sc->vtnet_rx_clustersz; 4543 VTNET_CORE_UNLOCK(sc); 4544 } 4545 4546 static void 4547 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event) 4548 { 4549 struct vtnet_softc *sc; 4550 static bool sw_lro_enabled = false; 4551 4552 /* 4553 * Disable software LRO, since it would require entering the network 4554 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll(). 4555 */ 4556 sc = if_getsoftc(ifp); 4557 switch (event) { 4558 case DEBUGNET_START: 4559 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0; 4560 if (sw_lro_enabled) 4561 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO; 4562 break; 4563 case DEBUGNET_END: 4564 if (sw_lro_enabled) 4565 sc->vtnet_flags |= VTNET_FLAG_SW_LRO; 4566 break; 4567 } 4568 } 4569 4570 static int 4571 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m) 4572 { 4573 struct vtnet_softc *sc; 4574 struct vtnet_txq *txq; 4575 int error; 4576 4577 sc = if_getsoftc(ifp); 4578 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4579 IFF_DRV_RUNNING) 4580 return (EBUSY); 4581 4582 txq = &sc->vtnet_txqs[0]; 4583 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE); 4584 if (error == 0) 4585 (void)vtnet_txq_notify(txq); 4586 return (error); 4587 } 4588 4589 static int 4590 vtnet_debugnet_poll(if_t ifp, int count) 4591 { 4592 struct vtnet_softc *sc; 4593 int i; 4594 4595 sc = if_getsoftc(ifp); 4596 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != 4597 IFF_DRV_RUNNING) 4598 return (EBUSY); 4599 4600 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]); 4601 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) 4602 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]); 4603 return (0); 4604 } 4605 #endif /* DEBUGNET */ 4606