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