1 /*- 2 * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* Driver for VirtIO network devices. */ 28 29 #include <sys/cdefs.h> 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/sockio.h> 35 #include <sys/mbuf.h> 36 #include <sys/malloc.h> 37 #include <sys/module.h> 38 #include <sys/socket.h> 39 #include <sys/sysctl.h> 40 #include <sys/taskqueue.h> 41 #include <sys/random.h> 42 #include <sys/sglist.h> 43 #include <sys/serialize.h> 44 #include <sys/bus.h> 45 #include <sys/rman.h> 46 47 #include <net/ethernet.h> 48 #include <net/if.h> 49 #include <net/if_arp.h> 50 #include <net/if_dl.h> 51 #include <net/if_types.h> 52 #include <net/if_media.h> 53 #include <net/vlan/if_vlan_var.h> 54 #include <net/vlan/if_vlan_ether.h> 55 #include <net/ifq_var.h> 56 57 #include <net/bpf.h> 58 59 #include <netinet/in_systm.h> 60 #include <netinet/in.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip6.h> 63 #include <netinet/udp.h> 64 #include <netinet/tcp.h> 65 66 #include <dev/virtual/virtio/virtio/virtio.h> 67 #include <dev/virtual/virtio/virtio/virtqueue.h> 68 69 #include "virtio_net.h" 70 #include "virtio_if.h" 71 72 struct vtnet_statistics { 73 unsigned long mbuf_alloc_failed; 74 75 unsigned long rx_frame_too_large; 76 unsigned long rx_enq_replacement_failed; 77 unsigned long rx_mergeable_failed; 78 unsigned long rx_csum_bad_ethtype; 79 unsigned long rx_csum_bad_start; 80 unsigned long rx_csum_bad_ipproto; 81 unsigned long rx_csum_bad_offset; 82 unsigned long rx_csum_failed; 83 unsigned long rx_csum_offloaded; 84 unsigned long rx_task_rescheduled; 85 86 unsigned long tx_csum_offloaded; 87 unsigned long tx_tso_offloaded; 88 unsigned long tx_csum_bad_ethtype; 89 unsigned long tx_tso_bad_ethtype; 90 unsigned long tx_task_rescheduled; 91 }; 92 93 struct vtnet_softc { 94 device_t vtnet_dev; 95 struct ifnet *vtnet_ifp; 96 struct lwkt_serialize vtnet_slz; 97 98 uint32_t vtnet_flags; 99 #define VTNET_FLAG_LINK 0x0001 100 #define VTNET_FLAG_SUSPENDED 0x0002 101 #define VTNET_FLAG_MAC 0x0004 102 #define VTNET_FLAG_CTRL_VQ 0x0008 103 #define VTNET_FLAG_CTRL_RX 0x0010 104 #define VTNET_FLAG_CTRL_MAC 0x0020 105 #define VTNET_FLAG_VLAN_FILTER 0x0040 106 #define VTNET_FLAG_TSO_ECN 0x0080 107 #define VTNET_FLAG_MRG_RXBUFS 0x0100 108 #define VTNET_FLAG_LRO_NOMRG 0x0200 109 110 struct virtqueue *vtnet_rx_vq; 111 struct virtqueue *vtnet_tx_vq; 112 struct virtqueue *vtnet_ctrl_vq; 113 114 struct vtnet_tx_header *vtnet_txhdrarea; 115 uint32_t vtnet_txhdridx; 116 struct vtnet_mac_filter *vtnet_macfilter; 117 118 int vtnet_hdr_size; 119 int vtnet_tx_size; 120 int vtnet_rx_size; 121 int vtnet_rx_process_limit; 122 int vtnet_rx_mbuf_size; 123 int vtnet_rx_mbuf_count; 124 int vtnet_if_flags; 125 int vtnet_watchdog_timer; 126 uint64_t vtnet_features; 127 128 struct task vtnet_cfgchg_task; 129 130 struct vtnet_statistics vtnet_stats; 131 132 struct callout vtnet_tick_ch; 133 134 eventhandler_tag vtnet_vlan_attach; 135 eventhandler_tag vtnet_vlan_detach; 136 137 struct ifmedia vtnet_media; 138 /* 139 * Fake media type; the host does not provide us with 140 * any real media information. 141 */ 142 #define VTNET_MEDIATYPE (IFM_ETHER | IFM_1000_T | IFM_FDX) 143 char vtnet_hwaddr[ETHER_ADDR_LEN]; 144 145 /* 146 * During reset, the host's VLAN filtering table is lost. The 147 * array below is used to restore all the VLANs configured on 148 * this interface after a reset. 149 */ 150 #define VTNET_VLAN_SHADOW_SIZE (4096 / 32) 151 int vtnet_nvlans; 152 uint32_t vtnet_vlan_shadow[VTNET_VLAN_SHADOW_SIZE]; 153 154 char vtnet_mtx_name[16]; 155 }; 156 157 /* 158 * When mergeable buffers are not negotiated, the vtnet_rx_header structure 159 * below is placed at the beginning of the mbuf data. Use 4 bytes of pad to 160 * both keep the VirtIO header and the data non-contiguous and to keep the 161 * frame's payload 4 byte aligned. 162 * 163 * When mergeable buffers are negotiated, the host puts the VirtIO header in 164 * the beginning of the first mbuf's data. 165 */ 166 #define VTNET_RX_HEADER_PAD 4 167 struct vtnet_rx_header { 168 struct virtio_net_hdr vrh_hdr; 169 char vrh_pad[VTNET_RX_HEADER_PAD]; 170 } __packed; 171 172 /* 173 * For each outgoing frame, the vtnet_tx_header below is allocated from 174 * the vtnet_tx_header_zone. 175 */ 176 struct vtnet_tx_header { 177 union { 178 struct virtio_net_hdr hdr; 179 struct virtio_net_hdr_mrg_rxbuf mhdr; 180 } vth_uhdr; 181 182 struct mbuf *vth_mbuf; 183 }; 184 185 MALLOC_DEFINE(M_VTNET, "VTNET_TX", "Outgoing VTNET TX frame header"); 186 187 /* 188 * The VirtIO specification does not place a limit on the number of MAC 189 * addresses the guest driver may request to be filtered. In practice, 190 * the host is constrained by available resources. To simplify this driver, 191 * impose a reasonably high limit of MAC addresses we will filter before 192 * falling back to promiscuous or all-multicast modes. 193 */ 194 #define VTNET_MAX_MAC_ENTRIES 128 195 196 struct vtnet_mac_table { 197 uint32_t nentries; 198 uint8_t macs[VTNET_MAX_MAC_ENTRIES][ETHER_ADDR_LEN]; 199 } __packed; 200 201 struct vtnet_mac_filter { 202 struct vtnet_mac_table vmf_unicast; 203 uint32_t vmf_pad; /* Make tables non-contiguous. */ 204 struct vtnet_mac_table vmf_multicast; 205 }; 206 207 #define VTNET_WATCHDOG_TIMEOUT 5 208 #define VTNET_CSUM_OFFLOAD (CSUM_TCP | CSUM_UDP) 209 210 /* Features desired/implemented by this driver. */ 211 #define VTNET_FEATURES \ 212 (VIRTIO_NET_F_MAC | \ 213 VIRTIO_NET_F_STATUS | \ 214 VIRTIO_NET_F_CTRL_VQ | \ 215 VIRTIO_NET_F_CTRL_RX | \ 216 VIRTIO_NET_F_CTRL_MAC_ADDR | \ 217 VIRTIO_NET_F_CTRL_VLAN | \ 218 VIRTIO_NET_F_CSUM | \ 219 VIRTIO_NET_F_HOST_TSO4 | \ 220 VIRTIO_NET_F_HOST_TSO6 | \ 221 VIRTIO_NET_F_HOST_ECN | \ 222 VIRTIO_NET_F_GUEST_CSUM | \ 223 VIRTIO_NET_F_GUEST_TSO4 | \ 224 VIRTIO_NET_F_GUEST_TSO6 | \ 225 VIRTIO_NET_F_GUEST_ECN | \ 226 VIRTIO_NET_F_MRG_RXBUF) 227 228 /* 229 * The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us 230 * frames larger than 1514 bytes. We do not yet support software LRO 231 * via tcp_lro_rx(). 232 */ 233 #define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \ 234 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN) 235 236 #define VTNET_MAX_MTU 65536 237 #define VTNET_MAX_RX_SIZE 65550 238 239 /* 240 * Used to preallocate the Vq indirect descriptors. The first segment 241 * is reserved for the header. 242 */ 243 #define VTNET_MIN_RX_SEGS 2 244 #define VTNET_MAX_RX_SEGS 34 245 #define VTNET_MAX_TX_SEGS 34 246 247 #define IFCAP_TSO4 0x00100 /* can do TCP Segmentation Offload */ 248 #define IFCAP_TSO6 0x00200 /* can do TCP6 Segmentation Offload */ 249 #define IFCAP_LRO 0x00400 /* can do Large Receive Offload */ 250 #define IFCAP_VLAN_HWFILTER 0x10000 /* interface hw can filter vlan tag */ 251 #define IFCAP_VLAN_HWTSO 0x40000 /* can do IFCAP_TSO on VLANs */ 252 253 254 /* 255 * Assert we can receive and transmit the maximum with regular 256 * size clusters. 257 */ 258 CTASSERT(((VTNET_MAX_RX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_RX_SIZE); 259 CTASSERT(((VTNET_MAX_TX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_MTU); 260 261 /* 262 * Determine how many mbufs are in each receive buffer. For LRO without 263 * mergeable descriptors, we must allocate an mbuf chain large enough to 264 * hold both the vtnet_rx_header and the maximum receivable data. 265 */ 266 #define VTNET_NEEDED_RX_MBUFS(_sc) \ 267 ((_sc)->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0 ? 1 : \ 268 howmany(sizeof(struct vtnet_rx_header) + VTNET_MAX_RX_SIZE, \ 269 (_sc)->vtnet_rx_mbuf_size) 270 271 static int vtnet_modevent(module_t, int, void *); 272 273 static int vtnet_probe(device_t); 274 static int vtnet_attach(device_t); 275 static int vtnet_detach(device_t); 276 static int vtnet_suspend(device_t); 277 static int vtnet_resume(device_t); 278 static int vtnet_shutdown(device_t); 279 static int vtnet_config_change(device_t); 280 281 static void vtnet_negotiate_features(struct vtnet_softc *); 282 static int vtnet_alloc_virtqueues(struct vtnet_softc *); 283 static void vtnet_get_hwaddr(struct vtnet_softc *); 284 static void vtnet_set_hwaddr(struct vtnet_softc *); 285 static int vtnet_is_link_up(struct vtnet_softc *); 286 static void vtnet_update_link_status(struct vtnet_softc *); 287 #if 0 288 static void vtnet_watchdog(struct vtnet_softc *); 289 #endif 290 static void vtnet_config_change_task(void *, int); 291 static int vtnet_change_mtu(struct vtnet_softc *, int); 292 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 293 294 static int vtnet_init_rx_vq(struct vtnet_softc *); 295 static void vtnet_free_rx_mbufs(struct vtnet_softc *); 296 static void vtnet_free_tx_mbufs(struct vtnet_softc *); 297 static void vtnet_free_ctrl_vq(struct vtnet_softc *); 298 299 static struct mbuf * vtnet_alloc_rxbuf(struct vtnet_softc *, int, 300 struct mbuf **); 301 static int vtnet_replace_rxbuf(struct vtnet_softc *, 302 struct mbuf *, int); 303 static int vtnet_newbuf(struct vtnet_softc *); 304 static void vtnet_discard_merged_rxbuf(struct vtnet_softc *, int); 305 static void vtnet_discard_rxbuf(struct vtnet_softc *, struct mbuf *); 306 static int vtnet_enqueue_rxbuf(struct vtnet_softc *, struct mbuf *); 307 static void vtnet_vlan_tag_remove(struct mbuf *); 308 static int vtnet_rx_csum(struct vtnet_softc *, struct mbuf *, 309 struct virtio_net_hdr *); 310 static int vtnet_rxeof_merged(struct vtnet_softc *, struct mbuf *, int); 311 static int vtnet_rxeof(struct vtnet_softc *, int, int *); 312 static void vtnet_rx_intr_task(void *); 313 static int vtnet_rx_vq_intr(void *); 314 315 static void vtnet_txeof(struct vtnet_softc *); 316 static struct mbuf * vtnet_tx_offload(struct vtnet_softc *, struct mbuf *, 317 struct virtio_net_hdr *); 318 static int vtnet_enqueue_txbuf(struct vtnet_softc *, struct mbuf **, 319 struct vtnet_tx_header *); 320 static int vtnet_encap(struct vtnet_softc *, struct mbuf **); 321 static void vtnet_start_locked(struct ifnet *, struct ifaltq_subque *); 322 static void vtnet_start(struct ifnet *, struct ifaltq_subque *); 323 static void vtnet_tick(void *); 324 static void vtnet_tx_intr_task(void *); 325 static int vtnet_tx_vq_intr(void *); 326 327 static void vtnet_stop(struct vtnet_softc *); 328 static int vtnet_reinit(struct vtnet_softc *); 329 static void vtnet_init_locked(struct vtnet_softc *); 330 static void vtnet_init(void *); 331 332 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *, 333 struct sglist *, int, int); 334 335 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *); 336 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int); 337 static int vtnet_set_promisc(struct vtnet_softc *, int); 338 static int vtnet_set_allmulti(struct vtnet_softc *, int); 339 static void vtnet_rx_filter(struct vtnet_softc *sc); 340 static void vtnet_rx_filter_mac(struct vtnet_softc *); 341 342 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t); 343 static void vtnet_rx_filter_vlan(struct vtnet_softc *); 344 static void vtnet_set_vlan_filter(struct vtnet_softc *, int, uint16_t); 345 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t); 346 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t); 347 348 static int vtnet_ifmedia_upd(struct ifnet *); 349 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *); 350 351 static void vtnet_add_statistics(struct vtnet_softc *); 352 353 static int vtnet_enable_rx_intr(struct vtnet_softc *); 354 static int vtnet_enable_tx_intr(struct vtnet_softc *); 355 static void vtnet_disable_rx_intr(struct vtnet_softc *); 356 static void vtnet_disable_tx_intr(struct vtnet_softc *); 357 358 /* Tunables. */ 359 static int vtnet_csum_disable = 0; 360 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable); 361 static int vtnet_tso_disable = 1; 362 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable); 363 static int vtnet_lro_disable = 1; 364 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable); 365 366 /* 367 * Reducing the number of transmit completed interrupts can 368 * improve performance. To do so, the define below keeps the 369 * Tx vq interrupt disabled and adds calls to vtnet_txeof() 370 * in the start and watchdog paths. The price to pay for this 371 * is the m_free'ing of transmitted mbufs may be delayed until 372 * the watchdog fires. 373 */ 374 #define VTNET_TX_INTR_MODERATION 375 376 static struct virtio_feature_desc vtnet_feature_desc[] = { 377 { VIRTIO_NET_F_CSUM, "TxChecksum" }, 378 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" }, 379 { VIRTIO_NET_F_MAC, "MacAddress" }, 380 { VIRTIO_NET_F_GSO, "TxAllGSO" }, 381 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" }, 382 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" }, 383 { VIRTIO_NET_F_GUEST_ECN, "RxECN" }, 384 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" }, 385 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" }, 386 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" }, 387 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" }, 388 { VIRTIO_NET_F_HOST_UFO, "TxUFO" }, 389 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" }, 390 { VIRTIO_NET_F_STATUS, "Status" }, 391 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" }, 392 { VIRTIO_NET_F_CTRL_RX, "RxMode" }, 393 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" }, 394 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" }, 395 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" }, 396 { VIRTIO_NET_F_MQ, "RFS" }, 397 { VIRTIO_NET_F_CTRL_MAC_ADDR, "SetMacAddress" }, 398 { 0, NULL } 399 }; 400 401 static device_method_t vtnet_methods[] = { 402 /* Device methods. */ 403 DEVMETHOD(device_probe, vtnet_probe), 404 DEVMETHOD(device_attach, vtnet_attach), 405 DEVMETHOD(device_detach, vtnet_detach), 406 DEVMETHOD(device_suspend, vtnet_suspend), 407 DEVMETHOD(device_resume, vtnet_resume), 408 DEVMETHOD(device_shutdown, vtnet_shutdown), 409 410 /* VirtIO methods. */ 411 DEVMETHOD(virtio_config_change, vtnet_config_change), 412 413 { 0, 0 } 414 }; 415 416 static driver_t vtnet_driver = { 417 "vtnet", 418 vtnet_methods, 419 sizeof(struct vtnet_softc) 420 }; 421 422 static devclass_t vtnet_devclass; 423 424 DRIVER_MODULE(vtnet, virtio_pci, vtnet_driver, vtnet_devclass, 425 vtnet_modevent, 0); 426 MODULE_VERSION(vtnet, 1); 427 MODULE_DEPEND(vtnet, virtio, 1, 1, 1); 428 429 static int 430 vtnet_modevent(module_t mod, int type, void *unused) 431 { 432 int error; 433 434 error = 0; 435 436 switch (type) { 437 case MOD_LOAD: 438 break; 439 case MOD_UNLOAD: 440 break; 441 case MOD_SHUTDOWN: 442 break; 443 default: 444 error = EOPNOTSUPP; 445 break; 446 } 447 448 return (error); 449 } 450 451 static int 452 vtnet_probe(device_t dev) 453 { 454 if (virtio_get_device_type(dev) != VIRTIO_ID_NETWORK) 455 return (ENXIO); 456 457 device_set_desc(dev, "VirtIO Networking Adapter"); 458 459 return (BUS_PROBE_DEFAULT); 460 } 461 462 static int 463 vtnet_attach(device_t dev) 464 { 465 struct vtnet_softc *sc; 466 struct ifnet *ifp; 467 int tx_size, error; 468 469 sc = device_get_softc(dev); 470 sc->vtnet_dev = dev; 471 472 lwkt_serialize_init(&sc->vtnet_slz); 473 callout_init(&sc->vtnet_tick_ch); 474 475 ifmedia_init(&sc->vtnet_media, IFM_IMASK, vtnet_ifmedia_upd, 476 vtnet_ifmedia_sts); 477 ifmedia_add(&sc->vtnet_media, VTNET_MEDIATYPE, 0, NULL); 478 ifmedia_set(&sc->vtnet_media, VTNET_MEDIATYPE); 479 480 vtnet_add_statistics(sc); 481 482 virtio_set_feature_desc(dev, vtnet_feature_desc); 483 vtnet_negotiate_features(sc); 484 485 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) { 486 /* This feature should always be negotiated. */ 487 sc->vtnet_flags |= VTNET_FLAG_MAC; 488 } 489 490 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) { 491 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS; 492 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); 493 } else { 494 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr); 495 } 496 497 sc->vtnet_rx_mbuf_size = MCLBYTES; 498 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc); 499 500 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) { 501 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ; 502 503 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 504 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX; 505 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN)) 506 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER; 507 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR) && 508 virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) 509 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC; 510 } 511 512 /* Read (or generate) the MAC address for the adapter. */ 513 vtnet_get_hwaddr(sc); 514 515 error = vtnet_alloc_virtqueues(sc); 516 if (error) { 517 device_printf(dev, "cannot allocate virtqueues\n"); 518 goto fail; 519 } 520 521 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER); 522 if (ifp == NULL) { 523 device_printf(dev, "cannot allocate ifnet structure\n"); 524 error = ENOSPC; 525 goto fail; 526 } 527 528 ifp->if_softc = sc; 529 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 530 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 531 ifp->if_init = vtnet_init; 532 ifp->if_start = vtnet_start; 533 ifp->if_ioctl = vtnet_ioctl; 534 535 sc->vtnet_rx_size = virtqueue_size(sc->vtnet_rx_vq); 536 sc->vtnet_rx_process_limit = sc->vtnet_rx_size; 537 538 tx_size = virtqueue_size(sc->vtnet_tx_vq); 539 sc->vtnet_tx_size = tx_size; 540 sc->vtnet_txhdridx = 0; 541 sc->vtnet_txhdrarea = contigmalloc( 542 ((sc->vtnet_tx_size / 2) + 1) * sizeof(struct vtnet_tx_header), 543 M_VTNET, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0); 544 if (sc->vtnet_txhdrarea == NULL) { 545 device_printf(dev, "cannot contigmalloc the tx headers\n"); 546 goto fail; 547 } 548 sc->vtnet_macfilter = contigmalloc( 549 sizeof(struct vtnet_mac_filter), 550 M_DEVBUF, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0); 551 if (sc->vtnet_macfilter == NULL) { 552 device_printf(dev, 553 "cannot contigmalloc the mac filter table\n"); 554 goto fail; 555 } 556 ifq_set_maxlen(&ifp->if_snd, tx_size - 1); 557 ifq_set_ready(&ifp->if_snd); 558 559 ether_ifattach(ifp, sc->vtnet_hwaddr, NULL); 560 561 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)){ 562 //ifp->if_capabilities |= IFCAP_LINKSTATE; 563 kprintf("add dynamic link state\n"); 564 } 565 566 /* Tell the upper layer(s) we support long frames. */ 567 ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header); 568 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 569 570 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) { 571 ifp->if_capabilities |= IFCAP_TXCSUM; 572 573 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4)) 574 ifp->if_capabilities |= IFCAP_TSO4; 575 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6)) 576 ifp->if_capabilities |= IFCAP_TSO6; 577 if (ifp->if_capabilities & IFCAP_TSO) 578 ifp->if_capabilities |= IFCAP_VLAN_HWTSO; 579 580 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN)) 581 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN; 582 } 583 584 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) { 585 ifp->if_capabilities |= IFCAP_RXCSUM; 586 587 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) || 588 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6)) 589 ifp->if_capabilities |= IFCAP_LRO; 590 } 591 592 if (ifp->if_capabilities & IFCAP_HWCSUM) { 593 /* 594 * VirtIO does not support VLAN tagging, but we can fake 595 * it by inserting and removing the 802.1Q header during 596 * transmit and receive. We are then able to do checksum 597 * offloading of VLAN frames. 598 */ 599 ifp->if_capabilities |= 600 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM; 601 } 602 603 ifp->if_capenable = ifp->if_capabilities; 604 605 /* 606 * Capabilities after here are not enabled by default. 607 */ 608 609 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) { 610 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER; 611 612 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config, 613 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST); 614 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig, 615 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST); 616 } 617 618 TASK_INIT(&sc->vtnet_cfgchg_task, 0, vtnet_config_change_task, sc); 619 620 error = virtio_setup_intr(dev, &sc->vtnet_slz); 621 if (error) { 622 device_printf(dev, "cannot setup virtqueue interrupts\n"); 623 ether_ifdetach(ifp); 624 goto fail; 625 } 626 627 /* 628 * Device defaults to promiscuous mode for backwards 629 * compatibility. Turn it off if possible. 630 */ 631 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 632 lwkt_serialize_enter(&sc->vtnet_slz); 633 if (vtnet_set_promisc(sc, 0) != 0) { 634 ifp->if_flags |= IFF_PROMISC; 635 device_printf(dev, 636 "cannot disable promiscuous mode\n"); 637 } 638 lwkt_serialize_exit(&sc->vtnet_slz); 639 } else 640 ifp->if_flags |= IFF_PROMISC; 641 642 fail: 643 if (error) 644 vtnet_detach(dev); 645 646 return (error); 647 } 648 649 static int 650 vtnet_detach(device_t dev) 651 { 652 struct vtnet_softc *sc; 653 struct ifnet *ifp; 654 655 sc = device_get_softc(dev); 656 ifp = sc->vtnet_ifp; 657 658 if (device_is_attached(dev)) { 659 lwkt_serialize_enter(&sc->vtnet_slz); 660 vtnet_stop(sc); 661 lwkt_serialize_exit(&sc->vtnet_slz); 662 663 callout_stop(&sc->vtnet_tick_ch); 664 taskqueue_drain(taskqueue_swi, &sc->vtnet_cfgchg_task); 665 666 ether_ifdetach(ifp); 667 } 668 669 if (sc->vtnet_vlan_attach != NULL) { 670 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach); 671 sc->vtnet_vlan_attach = NULL; 672 } 673 if (sc->vtnet_vlan_detach != NULL) { 674 EVENTHANDLER_DEREGISTER(vlan_unconfg, sc->vtnet_vlan_detach); 675 sc->vtnet_vlan_detach = NULL; 676 } 677 678 if (ifp) { 679 if_free(ifp); 680 sc->vtnet_ifp = NULL; 681 } 682 683 if (sc->vtnet_rx_vq != NULL) 684 vtnet_free_rx_mbufs(sc); 685 if (sc->vtnet_tx_vq != NULL) 686 vtnet_free_tx_mbufs(sc); 687 if (sc->vtnet_ctrl_vq != NULL) 688 vtnet_free_ctrl_vq(sc); 689 690 if (sc->vtnet_txhdrarea != NULL) { 691 contigfree(sc->vtnet_txhdrarea, 692 ((sc->vtnet_tx_size / 2) + 1) * 693 sizeof(struct vtnet_tx_header), M_VTNET); 694 sc->vtnet_txhdrarea = NULL; 695 } 696 if (sc->vtnet_macfilter != NULL) { 697 contigfree(sc->vtnet_macfilter, 698 sizeof(struct vtnet_mac_filter), M_DEVBUF); 699 sc->vtnet_macfilter = NULL; 700 } 701 702 ifmedia_removeall(&sc->vtnet_media); 703 704 return (0); 705 } 706 707 static int 708 vtnet_suspend(device_t dev) 709 { 710 struct vtnet_softc *sc; 711 712 sc = device_get_softc(dev); 713 714 lwkt_serialize_enter(&sc->vtnet_slz); 715 vtnet_stop(sc); 716 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED; 717 lwkt_serialize_exit(&sc->vtnet_slz); 718 719 return (0); 720 } 721 722 static int 723 vtnet_resume(device_t dev) 724 { 725 struct vtnet_softc *sc; 726 struct ifnet *ifp; 727 728 sc = device_get_softc(dev); 729 ifp = sc->vtnet_ifp; 730 731 lwkt_serialize_enter(&sc->vtnet_slz); 732 if (ifp->if_flags & IFF_UP) 733 vtnet_init_locked(sc); 734 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED; 735 lwkt_serialize_exit(&sc->vtnet_slz); 736 737 return (0); 738 } 739 740 static int 741 vtnet_shutdown(device_t dev) 742 { 743 744 /* 745 * Suspend already does all of what we need to 746 * do here; we just never expect to be resumed. 747 */ 748 return (vtnet_suspend(dev)); 749 } 750 751 static int 752 vtnet_config_change(device_t dev) 753 { 754 struct vtnet_softc *sc; 755 756 sc = device_get_softc(dev); 757 758 taskqueue_enqueue(taskqueue_thread[mycpuid], &sc->vtnet_cfgchg_task); 759 760 return (1); 761 } 762 763 static void 764 vtnet_negotiate_features(struct vtnet_softc *sc) 765 { 766 device_t dev; 767 uint64_t mask, features; 768 769 dev = sc->vtnet_dev; 770 mask = 0; 771 772 if (vtnet_csum_disable) 773 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM; 774 775 /* 776 * TSO and LRO are only available when their corresponding 777 * checksum offload feature is also negotiated. 778 */ 779 780 if (vtnet_csum_disable || vtnet_tso_disable) 781 mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | 782 VIRTIO_NET_F_HOST_ECN; 783 784 if (vtnet_csum_disable || vtnet_lro_disable) 785 mask |= VTNET_LRO_FEATURES; 786 787 features = VTNET_FEATURES & ~mask; 788 features |= VIRTIO_F_NOTIFY_ON_EMPTY; 789 sc->vtnet_features = virtio_negotiate_features(dev, features); 790 } 791 792 static int 793 vtnet_alloc_virtqueues(struct vtnet_softc *sc) 794 { 795 device_t dev; 796 struct vq_alloc_info vq_info[3]; 797 int nvqs, rxsegs; 798 799 dev = sc->vtnet_dev; 800 nvqs = 2; 801 802 /* 803 * Indirect descriptors are not needed for the Rx 804 * virtqueue when mergeable buffers are negotiated. 805 * The header is placed inline with the data, not 806 * in a separate descriptor, and mbuf clusters are 807 * always physically contiguous. 808 */ 809 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 810 rxsegs = sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG ? 811 VTNET_MAX_RX_SEGS : VTNET_MIN_RX_SEGS; 812 } else 813 rxsegs = 0; 814 815 VQ_ALLOC_INFO_INIT(&vq_info[0], rxsegs, 816 vtnet_rx_vq_intr, sc, &sc->vtnet_rx_vq, 817 "%s receive", device_get_nameunit(dev)); 818 819 VQ_ALLOC_INFO_INIT(&vq_info[1], VTNET_MAX_TX_SEGS, 820 vtnet_tx_vq_intr, sc, &sc->vtnet_tx_vq, 821 "%s transmit", device_get_nameunit(dev)); 822 823 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 824 nvqs++; 825 826 VQ_ALLOC_INFO_INIT(&vq_info[2], 0, NULL, NULL, 827 &sc->vtnet_ctrl_vq, "%s control", 828 device_get_nameunit(dev)); 829 } 830 831 return (virtio_alloc_virtqueues(dev, 0, nvqs, vq_info)); 832 } 833 834 static void 835 vtnet_set_hwaddr(struct vtnet_softc *sc) 836 { 837 device_t dev; 838 839 dev = sc->vtnet_dev; 840 841 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) && 842 (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)) { 843 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0) 844 device_printf(dev, "unable to set MAC address\n"); 845 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) { 846 virtio_write_device_config(dev, 847 offsetof(struct virtio_net_config, mac), 848 sc->vtnet_hwaddr, ETHER_ADDR_LEN); 849 } 850 } 851 852 static void 853 vtnet_get_hwaddr(struct vtnet_softc *sc) 854 { 855 device_t dev; 856 857 dev = sc->vtnet_dev; 858 859 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) { 860 /* 861 * Generate a random locally administered unicast address. 862 * 863 * It would be nice to generate the same MAC address across 864 * reboots, but it seems all the hosts currently available 865 * support the MAC feature, so this isn't too important. 866 */ 867 sc->vtnet_hwaddr[0] = 0xB2; 868 karc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1); 869 vtnet_set_hwaddr(sc); 870 return; 871 } 872 873 virtio_read_device_config(dev, 874 offsetof(struct virtio_net_config, mac), 875 sc->vtnet_hwaddr, ETHER_ADDR_LEN); 876 } 877 878 static int 879 vtnet_is_link_up(struct vtnet_softc *sc) 880 { 881 device_t dev; 882 struct ifnet *ifp; 883 uint16_t status; 884 885 dev = sc->vtnet_dev; 886 ifp = sc->vtnet_ifp; 887 888 ASSERT_SERIALIZED(&sc->vtnet_slz); 889 890 status = virtio_read_dev_config_2(dev, 891 offsetof(struct virtio_net_config, status)); 892 893 return ((status & VIRTIO_NET_S_LINK_UP) != 0); 894 } 895 896 static void 897 vtnet_update_link_status(struct vtnet_softc *sc) 898 { 899 device_t dev; 900 struct ifnet *ifp; 901 struct ifaltq_subque *ifsq; 902 int link; 903 904 dev = sc->vtnet_dev; 905 ifp = sc->vtnet_ifp; 906 ifsq = ifq_get_subq_default(&ifp->if_snd); 907 908 link = vtnet_is_link_up(sc); 909 910 if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) { 911 sc->vtnet_flags |= VTNET_FLAG_LINK; 912 if (bootverbose) 913 device_printf(dev, "Link is up\n"); 914 ifp->if_link_state = LINK_STATE_UP; 915 if_link_state_change(ifp); 916 if (!ifsq_is_empty(ifsq)) 917 vtnet_start_locked(ifp, ifsq); 918 } else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) { 919 sc->vtnet_flags &= ~VTNET_FLAG_LINK; 920 if (bootverbose) 921 device_printf(dev, "Link is down\n"); 922 923 ifp->if_link_state = LINK_STATE_DOWN; 924 if_link_state_change(ifp); 925 } 926 } 927 928 #if 0 929 static void 930 vtnet_watchdog(struct vtnet_softc *sc) 931 { 932 struct ifnet *ifp; 933 934 ifp = sc->vtnet_ifp; 935 936 #ifdef VTNET_TX_INTR_MODERATION 937 vtnet_txeof(sc); 938 #endif 939 940 if (sc->vtnet_watchdog_timer == 0 || --sc->vtnet_watchdog_timer) 941 return; 942 943 if_printf(ifp, "watchdog timeout -- resetting\n"); 944 #ifdef VTNET_DEBUG 945 virtqueue_dump(sc->vtnet_tx_vq); 946 #endif 947 ifp->if_oerrors++; 948 ifp->if_flags &= ~IFF_RUNNING; 949 vtnet_init_locked(sc); 950 } 951 #endif 952 953 static void 954 vtnet_config_change_task(void *arg, int pending) 955 { 956 struct vtnet_softc *sc; 957 958 sc = arg; 959 960 lwkt_serialize_enter(&sc->vtnet_slz); 961 vtnet_update_link_status(sc); 962 lwkt_serialize_exit(&sc->vtnet_slz); 963 } 964 965 static int 966 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,struct ucred *cr) 967 { 968 struct vtnet_softc *sc; 969 struct ifreq *ifr; 970 int reinit, mask, error; 971 972 sc = ifp->if_softc; 973 ifr = (struct ifreq *) data; 974 reinit = 0; 975 error = 0; 976 977 switch (cmd) { 978 case SIOCSIFMTU: 979 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > VTNET_MAX_MTU) 980 error = EINVAL; 981 else if (ifp->if_mtu != ifr->ifr_mtu) { 982 lwkt_serialize_enter(&sc->vtnet_slz); 983 error = vtnet_change_mtu(sc, ifr->ifr_mtu); 984 lwkt_serialize_exit(&sc->vtnet_slz); 985 } 986 break; 987 988 case SIOCSIFFLAGS: 989 lwkt_serialize_enter(&sc->vtnet_slz); 990 if ((ifp->if_flags & IFF_UP) == 0) { 991 if (ifp->if_flags & IFF_RUNNING) 992 vtnet_stop(sc); 993 } else if (ifp->if_flags & IFF_RUNNING) { 994 if ((ifp->if_flags ^ sc->vtnet_if_flags) & 995 (IFF_PROMISC | IFF_ALLMULTI)) { 996 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) 997 vtnet_rx_filter(sc); 998 else 999 error = ENOTSUP; 1000 } 1001 } else 1002 vtnet_init_locked(sc); 1003 1004 if (error == 0) 1005 sc->vtnet_if_flags = ifp->if_flags; 1006 lwkt_serialize_exit(&sc->vtnet_slz); 1007 break; 1008 1009 case SIOCADDMULTI: 1010 case SIOCDELMULTI: 1011 lwkt_serialize_enter(&sc->vtnet_slz); 1012 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) && 1013 (ifp->if_flags & IFF_RUNNING)) 1014 vtnet_rx_filter_mac(sc); 1015 lwkt_serialize_exit(&sc->vtnet_slz); 1016 break; 1017 1018 case SIOCSIFMEDIA: 1019 case SIOCGIFMEDIA: 1020 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd); 1021 break; 1022 1023 case SIOCSIFCAP: 1024 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 1025 1026 lwkt_serialize_enter(&sc->vtnet_slz); 1027 1028 if (mask & IFCAP_TXCSUM) { 1029 ifp->if_capenable ^= IFCAP_TXCSUM; 1030 if (ifp->if_capenable & IFCAP_TXCSUM) 1031 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 1032 else 1033 ifp->if_hwassist &= ~VTNET_CSUM_OFFLOAD; 1034 } 1035 1036 if (mask & IFCAP_TSO4) { 1037 ifp->if_capenable ^= IFCAP_TSO4; 1038 if (ifp->if_capenable & IFCAP_TSO4) 1039 ifp->if_hwassist |= CSUM_TSO; 1040 else 1041 ifp->if_hwassist &= ~CSUM_TSO; 1042 } 1043 1044 if (mask & IFCAP_RXCSUM) { 1045 ifp->if_capenable ^= IFCAP_RXCSUM; 1046 reinit = 1; 1047 } 1048 1049 if (mask & IFCAP_LRO) { 1050 ifp->if_capenable ^= IFCAP_LRO; 1051 reinit = 1; 1052 } 1053 1054 if (mask & IFCAP_VLAN_HWFILTER) { 1055 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER; 1056 reinit = 1; 1057 } 1058 1059 if (mask & IFCAP_VLAN_HWTSO) 1060 ifp->if_capenable ^= IFCAP_VLAN_HWTSO; 1061 1062 if (mask & IFCAP_VLAN_HWTAGGING) 1063 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING; 1064 1065 if (reinit && (ifp->if_flags & IFF_RUNNING)) { 1066 ifp->if_flags &= ~IFF_RUNNING; 1067 vtnet_init_locked(sc); 1068 } 1069 //VLAN_CAPABILITIES(ifp); 1070 1071 lwkt_serialize_exit(&sc->vtnet_slz); 1072 break; 1073 1074 default: 1075 error = ether_ioctl(ifp, cmd, data); 1076 break; 1077 } 1078 1079 return (error); 1080 } 1081 1082 static int 1083 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu) 1084 { 1085 struct ifnet *ifp; 1086 int new_frame_size, clsize; 1087 1088 ifp = sc->vtnet_ifp; 1089 1090 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1091 new_frame_size = sizeof(struct vtnet_rx_header) + 1092 sizeof(struct ether_vlan_header) + new_mtu; 1093 1094 if (new_frame_size > MJUM9BYTES) 1095 return (EINVAL); 1096 1097 if (new_frame_size <= MCLBYTES) 1098 clsize = MCLBYTES; 1099 else 1100 clsize = MJUM9BYTES; 1101 } else { 1102 new_frame_size = sizeof(struct virtio_net_hdr_mrg_rxbuf) + 1103 sizeof(struct ether_vlan_header) + new_mtu; 1104 1105 if (new_frame_size <= MCLBYTES) 1106 clsize = MCLBYTES; 1107 else 1108 clsize = MJUMPAGESIZE; 1109 } 1110 1111 sc->vtnet_rx_mbuf_size = clsize; 1112 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc); 1113 KASSERT(sc->vtnet_rx_mbuf_count < VTNET_MAX_RX_SEGS, 1114 ("too many rx mbufs: %d", sc->vtnet_rx_mbuf_count)); 1115 1116 ifp->if_mtu = new_mtu; 1117 1118 if (ifp->if_flags & IFF_RUNNING) { 1119 ifp->if_flags &= ~IFF_RUNNING; 1120 vtnet_init_locked(sc); 1121 } 1122 1123 return (0); 1124 } 1125 1126 static int 1127 vtnet_init_rx_vq(struct vtnet_softc *sc) 1128 { 1129 struct virtqueue *vq; 1130 int nbufs, error; 1131 1132 vq = sc->vtnet_rx_vq; 1133 nbufs = 0; 1134 error = ENOSPC; 1135 1136 while (!virtqueue_full(vq)) { 1137 if ((error = vtnet_newbuf(sc)) != 0) 1138 break; 1139 nbufs++; 1140 } 1141 1142 if (nbufs > 0) { 1143 virtqueue_notify(vq, &sc->vtnet_slz); 1144 1145 /* 1146 * EMSGSIZE signifies the virtqueue did not have enough 1147 * entries available to hold the last mbuf. This is not 1148 * an error. We should not get ENOSPC since we check if 1149 * the virtqueue is full before attempting to add a 1150 * buffer. 1151 */ 1152 if (error == EMSGSIZE) 1153 error = 0; 1154 } 1155 1156 return (error); 1157 } 1158 1159 static void 1160 vtnet_free_rx_mbufs(struct vtnet_softc *sc) 1161 { 1162 struct virtqueue *vq; 1163 struct mbuf *m; 1164 int last; 1165 1166 vq = sc->vtnet_rx_vq; 1167 last = 0; 1168 1169 while ((m = virtqueue_drain(vq, &last)) != NULL) 1170 m_freem(m); 1171 1172 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Rx Vq")); 1173 } 1174 1175 static void 1176 vtnet_free_tx_mbufs(struct vtnet_softc *sc) 1177 { 1178 struct virtqueue *vq; 1179 struct vtnet_tx_header *txhdr; 1180 int last; 1181 1182 vq = sc->vtnet_tx_vq; 1183 last = 0; 1184 1185 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) { 1186 m_freem(txhdr->vth_mbuf); 1187 } 1188 1189 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Tx Vq")); 1190 } 1191 1192 static void 1193 vtnet_free_ctrl_vq(struct vtnet_softc *sc) 1194 { 1195 /* 1196 * The control virtqueue is only polled, therefore 1197 * it should already be empty. 1198 */ 1199 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq), 1200 ("Ctrl Vq not empty")); 1201 } 1202 1203 static struct mbuf * 1204 vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) 1205 { 1206 struct mbuf *m_head, *m_tail, *m; 1207 int i, clsize; 1208 1209 clsize = sc->vtnet_rx_mbuf_size; 1210 1211 /*use getcl instead of getjcl. see if_mxge.c comment line 2398*/ 1212 //m_head = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, clsize); 1213 m_head = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR ); 1214 if (m_head == NULL) 1215 goto fail; 1216 1217 m_head->m_len = clsize; 1218 m_tail = m_head; 1219 1220 if (nbufs > 1) { 1221 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1222 ("chained Rx mbuf requested without LRO_NOMRG")); 1223 1224 for (i = 0; i < nbufs - 1; i++) { 1225 //m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize); 1226 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1227 if (m == NULL) 1228 goto fail; 1229 1230 m->m_len = clsize; 1231 m_tail->m_next = m; 1232 m_tail = m; 1233 } 1234 } 1235 1236 if (m_tailp != NULL) 1237 *m_tailp = m_tail; 1238 1239 return (m_head); 1240 1241 fail: 1242 sc->vtnet_stats.mbuf_alloc_failed++; 1243 m_freem(m_head); 1244 1245 return (NULL); 1246 } 1247 1248 static int 1249 vtnet_replace_rxbuf(struct vtnet_softc *sc, struct mbuf *m0, int len0) 1250 { 1251 struct mbuf *m, *m_prev; 1252 struct mbuf *m_new, *m_tail; 1253 int len, clsize, nreplace, error; 1254 1255 m = m0; 1256 m_prev = NULL; 1257 len = len0; 1258 1259 m_tail = NULL; 1260 clsize = sc->vtnet_rx_mbuf_size; 1261 nreplace = 0; 1262 1263 if (m->m_next != NULL) 1264 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG, 1265 ("chained Rx mbuf without LRO_NOMRG")); 1266 1267 /* 1268 * Since LRO_NOMRG mbuf chains are so large, we want to avoid 1269 * allocating an entire chain for each received frame. When 1270 * the received frame's length is less than that of the chain, 1271 * the unused mbufs are reassigned to the new chain. 1272 */ 1273 while (len > 0) { 1274 /* 1275 * Something is seriously wrong if we received 1276 * a frame larger than the mbuf chain. Drop it. 1277 */ 1278 if (m == NULL) { 1279 sc->vtnet_stats.rx_frame_too_large++; 1280 return (EMSGSIZE); 1281 } 1282 1283 KASSERT(m->m_len == clsize, 1284 ("mbuf length not expected cluster size: %d", 1285 m->m_len)); 1286 1287 m->m_len = MIN(m->m_len, len); 1288 len -= m->m_len; 1289 1290 m_prev = m; 1291 m = m->m_next; 1292 nreplace++; 1293 } 1294 1295 KASSERT(m_prev != NULL, ("m_prev == NULL")); 1296 KASSERT(nreplace <= sc->vtnet_rx_mbuf_count, 1297 ("too many replacement mbufs: %d/%d", nreplace, 1298 sc->vtnet_rx_mbuf_count)); 1299 1300 m_new = vtnet_alloc_rxbuf(sc, nreplace, &m_tail); 1301 if (m_new == NULL) { 1302 m_prev->m_len = clsize; 1303 return (ENOBUFS); 1304 } 1305 1306 /* 1307 * Move unused mbufs, if any, from the original chain 1308 * onto the end of the new chain. 1309 */ 1310 if (m_prev->m_next != NULL) { 1311 m_tail->m_next = m_prev->m_next; 1312 m_prev->m_next = NULL; 1313 } 1314 1315 error = vtnet_enqueue_rxbuf(sc, m_new); 1316 if (error) { 1317 /* 1318 * BAD! We could not enqueue the replacement mbuf chain. We 1319 * must restore the m0 chain to the original state if it was 1320 * modified so we can subsequently discard it. 1321 * 1322 * NOTE: The replacement is suppose to be an identical copy 1323 * to the one just dequeued so this is an unexpected error. 1324 */ 1325 sc->vtnet_stats.rx_enq_replacement_failed++; 1326 1327 if (m_tail->m_next != NULL) { 1328 m_prev->m_next = m_tail->m_next; 1329 m_tail->m_next = NULL; 1330 } 1331 1332 m_prev->m_len = clsize; 1333 m_freem(m_new); 1334 } 1335 1336 return (error); 1337 } 1338 1339 static int 1340 vtnet_newbuf(struct vtnet_softc *sc) 1341 { 1342 struct mbuf *m; 1343 int error; 1344 1345 m = vtnet_alloc_rxbuf(sc, sc->vtnet_rx_mbuf_count, NULL); 1346 if (m == NULL) 1347 return (ENOBUFS); 1348 1349 error = vtnet_enqueue_rxbuf(sc, m); 1350 if (error) 1351 m_freem(m); 1352 1353 return (error); 1354 } 1355 1356 static void 1357 vtnet_discard_merged_rxbuf(struct vtnet_softc *sc, int nbufs) 1358 { 1359 struct virtqueue *vq; 1360 struct mbuf *m; 1361 1362 vq = sc->vtnet_rx_vq; 1363 1364 while (--nbufs > 0) { 1365 if ((m = virtqueue_dequeue(vq, NULL)) == NULL) 1366 break; 1367 vtnet_discard_rxbuf(sc, m); 1368 } 1369 } 1370 1371 static void 1372 vtnet_discard_rxbuf(struct vtnet_softc *sc, struct mbuf *m) 1373 { 1374 int error; 1375 1376 /* 1377 * Requeue the discarded mbuf. This should always be 1378 * successful since it was just dequeued. 1379 */ 1380 error = vtnet_enqueue_rxbuf(sc, m); 1381 KASSERT(error == 0, ("cannot requeue discarded mbuf")); 1382 } 1383 1384 static int 1385 vtnet_enqueue_rxbuf(struct vtnet_softc *sc, struct mbuf *m) 1386 { 1387 struct sglist sg; 1388 struct sglist_seg segs[VTNET_MAX_RX_SEGS]; 1389 struct vtnet_rx_header *rxhdr; 1390 struct virtio_net_hdr *hdr; 1391 uint8_t *mdata; 1392 int offset, error; 1393 1394 ASSERT_SERIALIZED(&sc->vtnet_slz); 1395 if ((sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0) 1396 KASSERT(m->m_next == NULL, ("chained Rx mbuf")); 1397 1398 sglist_init(&sg, VTNET_MAX_RX_SEGS, segs); 1399 1400 mdata = mtod(m, uint8_t *); 1401 offset = 0; 1402 1403 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1404 rxhdr = (struct vtnet_rx_header *) mdata; 1405 hdr = &rxhdr->vrh_hdr; 1406 offset += sizeof(struct vtnet_rx_header); 1407 1408 error = sglist_append(&sg, hdr, sc->vtnet_hdr_size); 1409 KASSERT(error == 0, ("cannot add header to sglist")); 1410 } 1411 1412 error = sglist_append(&sg, mdata + offset, m->m_len - offset); 1413 if (error) 1414 return (error); 1415 1416 if (m->m_next != NULL) { 1417 error = sglist_append_mbuf(&sg, m->m_next); 1418 if (error) 1419 return (error); 1420 } 1421 1422 return (virtqueue_enqueue(sc->vtnet_rx_vq, m, &sg, 0, sg.sg_nseg)); 1423 } 1424 1425 static void 1426 vtnet_vlan_tag_remove(struct mbuf *m) 1427 { 1428 struct ether_vlan_header *evl; 1429 1430 evl = mtod(m, struct ether_vlan_header *); 1431 1432 m->m_pkthdr.ether_vlantag = ntohs(evl->evl_tag); 1433 m->m_flags |= M_VLANTAG; 1434 1435 /* Strip the 802.1Q header. */ 1436 bcopy((char *) evl, (char *) evl + ETHER_VLAN_ENCAP_LEN, 1437 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1438 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1439 } 1440 1441 /* 1442 * Alternative method of doing receive checksum offloading. Rather 1443 * than parsing the received frame down to the IP header, use the 1444 * csum_offset to determine which CSUM_* flags are appropriate. We 1445 * can get by with doing this only because the checksum offsets are 1446 * unique for the things we care about. 1447 */ 1448 static int 1449 vtnet_rx_csum(struct vtnet_softc *sc, struct mbuf *m, 1450 struct virtio_net_hdr *hdr) 1451 { 1452 struct ether_header *eh; 1453 struct ether_vlan_header *evh; 1454 struct udphdr *udp; 1455 int csum_len; 1456 uint16_t eth_type; 1457 1458 csum_len = hdr->csum_start + hdr->csum_offset; 1459 1460 if (csum_len < sizeof(struct ether_header) + sizeof(struct ip)) 1461 return (1); 1462 if (m->m_len < csum_len) 1463 return (1); 1464 1465 eh = mtod(m, struct ether_header *); 1466 eth_type = ntohs(eh->ether_type); 1467 if (eth_type == ETHERTYPE_VLAN) { 1468 evh = mtod(m, struct ether_vlan_header *); 1469 eth_type = ntohs(evh->evl_proto); 1470 } 1471 1472 if (eth_type != ETHERTYPE_IP && eth_type != ETHERTYPE_IPV6) { 1473 sc->vtnet_stats.rx_csum_bad_ethtype++; 1474 return (1); 1475 } 1476 1477 /* Use the offset to determine the appropriate CSUM_* flags. */ 1478 switch (hdr->csum_offset) { 1479 case offsetof(struct udphdr, uh_sum): 1480 if (m->m_len < hdr->csum_start + sizeof(struct udphdr)) 1481 return (1); 1482 udp = (struct udphdr *)(mtod(m, uint8_t *) + hdr->csum_start); 1483 if (udp->uh_sum == 0) 1484 return (0); 1485 1486 /* FALLTHROUGH */ 1487 1488 case offsetof(struct tcphdr, th_sum): 1489 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1490 m->m_pkthdr.csum_data = 0xFFFF; 1491 break; 1492 1493 default: 1494 sc->vtnet_stats.rx_csum_bad_offset++; 1495 return (1); 1496 } 1497 1498 sc->vtnet_stats.rx_csum_offloaded++; 1499 1500 return (0); 1501 } 1502 1503 static int 1504 vtnet_rxeof_merged(struct vtnet_softc *sc, struct mbuf *m_head, int nbufs) 1505 { 1506 struct ifnet *ifp; 1507 struct virtqueue *vq; 1508 struct mbuf *m, *m_tail; 1509 int len; 1510 1511 ifp = sc->vtnet_ifp; 1512 vq = sc->vtnet_rx_vq; 1513 m_tail = m_head; 1514 1515 while (--nbufs > 0) { 1516 m = virtqueue_dequeue(vq, &len); 1517 if (m == NULL) { 1518 ifp->if_ierrors++; 1519 goto fail; 1520 } 1521 1522 if (vtnet_newbuf(sc) != 0) { 1523 ifp->if_iqdrops++; 1524 vtnet_discard_rxbuf(sc, m); 1525 if (nbufs > 1) 1526 vtnet_discard_merged_rxbuf(sc, nbufs); 1527 goto fail; 1528 } 1529 1530 if (m->m_len < len) 1531 len = m->m_len; 1532 1533 m->m_len = len; 1534 m->m_flags &= ~M_PKTHDR; 1535 1536 m_head->m_pkthdr.len += len; 1537 m_tail->m_next = m; 1538 m_tail = m; 1539 } 1540 1541 return (0); 1542 1543 fail: 1544 sc->vtnet_stats.rx_mergeable_failed++; 1545 m_freem(m_head); 1546 1547 return (1); 1548 } 1549 1550 static int 1551 vtnet_rxeof(struct vtnet_softc *sc, int count, int *rx_npktsp) 1552 { 1553 struct virtio_net_hdr lhdr; 1554 struct ifnet *ifp; 1555 struct virtqueue *vq; 1556 struct mbuf *m; 1557 struct ether_header *eh; 1558 struct virtio_net_hdr *hdr; 1559 struct virtio_net_hdr_mrg_rxbuf *mhdr; 1560 int len, deq, nbufs, adjsz, rx_npkts; 1561 1562 ifp = sc->vtnet_ifp; 1563 vq = sc->vtnet_rx_vq; 1564 hdr = &lhdr; 1565 deq = 0; 1566 rx_npkts = 0; 1567 1568 ASSERT_SERIALIZED(&sc->vtnet_slz); 1569 1570 while (--count >= 0) { 1571 m = virtqueue_dequeue(vq, &len); 1572 if (m == NULL) 1573 break; 1574 deq++; 1575 1576 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) { 1577 ifp->if_ierrors++; 1578 vtnet_discard_rxbuf(sc, m); 1579 continue; 1580 } 1581 1582 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) { 1583 nbufs = 1; 1584 adjsz = sizeof(struct vtnet_rx_header); 1585 /* 1586 * Account for our pad between the header and 1587 * the actual start of the frame. 1588 */ 1589 len += VTNET_RX_HEADER_PAD; 1590 } else { 1591 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *); 1592 nbufs = mhdr->num_buffers; 1593 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1594 } 1595 1596 if (vtnet_replace_rxbuf(sc, m, len) != 0) { 1597 ifp->if_iqdrops++; 1598 vtnet_discard_rxbuf(sc, m); 1599 if (nbufs > 1) 1600 vtnet_discard_merged_rxbuf(sc, nbufs); 1601 continue; 1602 } 1603 1604 m->m_pkthdr.len = len; 1605 m->m_pkthdr.rcvif = ifp; 1606 m->m_pkthdr.csum_flags = 0; 1607 1608 if (nbufs > 1) { 1609 if (vtnet_rxeof_merged(sc, m, nbufs) != 0) 1610 continue; 1611 } 1612 1613 ifp->if_ipackets++; 1614 1615 /* 1616 * Save copy of header before we strip it. For both mergeable 1617 * and non-mergeable, the VirtIO header is placed first in the 1618 * mbuf's data. We no longer need num_buffers, so always use a 1619 * virtio_net_hdr. 1620 */ 1621 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr)); 1622 m_adj(m, adjsz); 1623 1624 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1625 eh = mtod(m, struct ether_header *); 1626 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1627 vtnet_vlan_tag_remove(m); 1628 1629 /* 1630 * With the 802.1Q header removed, update the 1631 * checksum starting location accordingly. 1632 */ 1633 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1634 hdr->csum_start -= 1635 ETHER_VLAN_ENCAP_LEN; 1636 } 1637 } 1638 1639 if (ifp->if_capenable & IFCAP_RXCSUM && 1640 hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 1641 if (vtnet_rx_csum(sc, m, hdr) != 0) 1642 sc->vtnet_stats.rx_csum_failed++; 1643 } 1644 1645 lwkt_serialize_exit(&sc->vtnet_slz); 1646 rx_npkts++; 1647 ifp->if_input(ifp, m, NULL, -1); 1648 lwkt_serialize_enter(&sc->vtnet_slz); 1649 1650 /* 1651 * The interface may have been stopped while we were 1652 * passing the packet up the network stack. 1653 */ 1654 if ((ifp->if_flags & IFF_RUNNING) == 0) 1655 break; 1656 } 1657 1658 virtqueue_notify(vq, &sc->vtnet_slz); 1659 1660 if (rx_npktsp != NULL) 1661 *rx_npktsp = rx_npkts; 1662 1663 return (count > 0 ? 0 : EAGAIN); 1664 } 1665 1666 static void 1667 vtnet_rx_intr_task(void *arg) 1668 { 1669 struct vtnet_softc *sc; 1670 struct ifnet *ifp; 1671 int more; 1672 1673 sc = arg; 1674 ifp = sc->vtnet_ifp; 1675 1676 next: 1677 // lwkt_serialize_enter(&sc->vtnet_slz); 1678 1679 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1680 vtnet_enable_rx_intr(sc); 1681 // lwkt_serialize_exit(&sc->vtnet_slz); 1682 return; 1683 } 1684 1685 more = vtnet_rxeof(sc, sc->vtnet_rx_process_limit, NULL); 1686 if (!more && vtnet_enable_rx_intr(sc) != 0) { 1687 vtnet_disable_rx_intr(sc); 1688 more = 1; 1689 } 1690 1691 // lwkt_serialize_exit(&sc->vtnet_slz); 1692 1693 if (more) { 1694 sc->vtnet_stats.rx_task_rescheduled++; 1695 goto next; 1696 } 1697 } 1698 1699 static int 1700 vtnet_rx_vq_intr(void *xsc) 1701 { 1702 struct vtnet_softc *sc; 1703 1704 sc = xsc; 1705 1706 vtnet_disable_rx_intr(sc); 1707 vtnet_rx_intr_task(sc); 1708 1709 return (1); 1710 } 1711 1712 static void 1713 vtnet_txeof(struct vtnet_softc *sc) 1714 { 1715 struct virtqueue *vq; 1716 struct ifnet *ifp; 1717 struct vtnet_tx_header *txhdr; 1718 int deq; 1719 1720 vq = sc->vtnet_tx_vq; 1721 ifp = sc->vtnet_ifp; 1722 deq = 0; 1723 1724 ASSERT_SERIALIZED(&sc->vtnet_slz); 1725 1726 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) { 1727 deq++; 1728 ifp->if_opackets++; 1729 m_freem(txhdr->vth_mbuf); 1730 } 1731 1732 if (deq > 0) { 1733 ifq_clr_oactive(&ifp->if_snd); 1734 if (virtqueue_empty(vq)) 1735 sc->vtnet_watchdog_timer = 0; 1736 } 1737 } 1738 1739 static struct mbuf * 1740 vtnet_tx_offload(struct vtnet_softc *sc, struct mbuf *m, 1741 struct virtio_net_hdr *hdr) 1742 { 1743 struct ifnet *ifp; 1744 struct ether_header *eh; 1745 struct ether_vlan_header *evh; 1746 struct ip *ip; 1747 struct ip6_hdr *ip6; 1748 struct tcphdr *tcp; 1749 int ip_offset; 1750 uint16_t eth_type, csum_start; 1751 uint8_t ip_proto, gso_type; 1752 1753 ifp = sc->vtnet_ifp; 1754 M_ASSERTPKTHDR(m); 1755 1756 ip_offset = sizeof(struct ether_header); 1757 if (m->m_len < ip_offset) { 1758 if ((m = m_pullup(m, ip_offset)) == NULL) 1759 return (NULL); 1760 } 1761 1762 eh = mtod(m, struct ether_header *); 1763 eth_type = ntohs(eh->ether_type); 1764 if (eth_type == ETHERTYPE_VLAN) { 1765 ip_offset = sizeof(struct ether_vlan_header); 1766 if (m->m_len < ip_offset) { 1767 if ((m = m_pullup(m, ip_offset)) == NULL) 1768 return (NULL); 1769 } 1770 evh = mtod(m, struct ether_vlan_header *); 1771 eth_type = ntohs(evh->evl_proto); 1772 } 1773 1774 switch (eth_type) { 1775 case ETHERTYPE_IP: 1776 if (m->m_len < ip_offset + sizeof(struct ip)) { 1777 m = m_pullup(m, ip_offset + sizeof(struct ip)); 1778 if (m == NULL) 1779 return (NULL); 1780 } 1781 1782 ip = (struct ip *)(mtod(m, uint8_t *) + ip_offset); 1783 ip_proto = ip->ip_p; 1784 csum_start = ip_offset + (ip->ip_hl << 2); 1785 gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 1786 break; 1787 1788 case ETHERTYPE_IPV6: 1789 if (m->m_len < ip_offset + sizeof(struct ip6_hdr)) { 1790 m = m_pullup(m, ip_offset + sizeof(struct ip6_hdr)); 1791 if (m == NULL) 1792 return (NULL); 1793 } 1794 1795 ip6 = (struct ip6_hdr *)(mtod(m, uint8_t *) + ip_offset); 1796 /* 1797 * XXX Assume no extension headers are present. Presently, 1798 * this will always be true in the case of TSO, and FreeBSD 1799 * does not perform checksum offloading of IPv6 yet. 1800 */ 1801 ip_proto = ip6->ip6_nxt; 1802 csum_start = ip_offset + sizeof(struct ip6_hdr); 1803 gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 1804 break; 1805 1806 default: 1807 return (m); 1808 } 1809 1810 if (m->m_pkthdr.csum_flags & VTNET_CSUM_OFFLOAD) { 1811 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 1812 hdr->csum_start = csum_start; 1813 hdr->csum_offset = m->m_pkthdr.csum_data; 1814 1815 sc->vtnet_stats.tx_csum_offloaded++; 1816 } 1817 1818 if (m->m_pkthdr.csum_flags & CSUM_TSO) { 1819 if (ip_proto != IPPROTO_TCP) 1820 return (m); 1821 1822 if (m->m_len < csum_start + sizeof(struct tcphdr)) { 1823 m = m_pullup(m, csum_start + sizeof(struct tcphdr)); 1824 if (m == NULL) 1825 return (NULL); 1826 } 1827 1828 tcp = (struct tcphdr *)(mtod(m, uint8_t *) + csum_start); 1829 hdr->gso_type = gso_type; 1830 hdr->hdr_len = csum_start + (tcp->th_off << 2); 1831 hdr->gso_size = m->m_pkthdr.tso_segsz; 1832 1833 if (tcp->th_flags & TH_CWR) { 1834 /* 1835 * Drop if we did not negotiate VIRTIO_NET_F_HOST_ECN. 1836 * ECN support is only configurable globally with the 1837 * net.inet.tcp.ecn.enable sysctl knob. 1838 */ 1839 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) { 1840 if_printf(ifp, "TSO with ECN not supported " 1841 "by host\n"); 1842 m_freem(m); 1843 return (NULL); 1844 } 1845 1846 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 1847 } 1848 1849 sc->vtnet_stats.tx_tso_offloaded++; 1850 } 1851 1852 return (m); 1853 } 1854 1855 static int 1856 vtnet_enqueue_txbuf(struct vtnet_softc *sc, struct mbuf **m_head, 1857 struct vtnet_tx_header *txhdr) 1858 { 1859 struct sglist sg; 1860 struct sglist_seg segs[VTNET_MAX_TX_SEGS]; 1861 struct virtqueue *vq; 1862 struct mbuf *m; 1863 int collapsed, error; 1864 1865 vq = sc->vtnet_tx_vq; 1866 m = *m_head; 1867 collapsed = 0; 1868 1869 sglist_init(&sg, VTNET_MAX_TX_SEGS, segs); 1870 error = sglist_append(&sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size); 1871 KASSERT(error == 0 && sg.sg_nseg == 1, 1872 ("cannot add header to sglist")); 1873 1874 again: 1875 error = sglist_append_mbuf(&sg, m); 1876 if (error) { 1877 if (collapsed) 1878 goto fail; 1879 1880 //m = m_collapse(m, M_NOWAIT, VTNET_MAX_TX_SEGS - 1); 1881 m = m_defrag(m, M_NOWAIT); 1882 if (m == NULL) 1883 goto fail; 1884 1885 *m_head = m; 1886 collapsed = 1; 1887 goto again; 1888 } 1889 1890 txhdr->vth_mbuf = m; 1891 1892 return (virtqueue_enqueue(vq, txhdr, &sg, sg.sg_nseg, 0)); 1893 1894 fail: 1895 m_freem(*m_head); 1896 *m_head = NULL; 1897 1898 return (ENOBUFS); 1899 } 1900 1901 static struct mbuf * 1902 vtnet_vlan_tag_insert(struct mbuf *m) 1903 { 1904 struct mbuf *n; 1905 struct ether_vlan_header *evl; 1906 1907 if (M_WRITABLE(m) == 0) { 1908 n = m_dup(m, M_NOWAIT); 1909 m_freem(m); 1910 if ((m = n) == NULL) 1911 return (NULL); 1912 } 1913 1914 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT); 1915 if (m == NULL) 1916 return (NULL); 1917 if (m->m_len < sizeof(struct ether_vlan_header)) { 1918 m = m_pullup(m, sizeof(struct ether_vlan_header)); 1919 if (m == NULL) 1920 return (NULL); 1921 } 1922 1923 /* Insert 802.1Q header into the existing Ethernet header. */ 1924 evl = mtod(m, struct ether_vlan_header *); 1925 bcopy((char *) evl + ETHER_VLAN_ENCAP_LEN, 1926 (char *) evl, ETHER_HDR_LEN - ETHER_TYPE_LEN); 1927 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1928 evl->evl_tag = htons(m->m_pkthdr.ether_vlantag); 1929 m->m_flags &= ~M_VLANTAG; 1930 1931 return (m); 1932 } 1933 1934 static int 1935 vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head) 1936 { 1937 struct vtnet_tx_header *txhdr; 1938 struct virtio_net_hdr *hdr; 1939 struct mbuf *m; 1940 int error; 1941 1942 txhdr = &sc->vtnet_txhdrarea[sc->vtnet_txhdridx]; 1943 memset(txhdr, 0, sizeof(struct vtnet_tx_header)); 1944 1945 /* 1946 * Always use the non-mergeable header to simplify things. When 1947 * the mergeable feature is negotiated, the num_buffers field 1948 * must be set to zero. We use vtnet_hdr_size later to enqueue 1949 * the correct header size to the host. 1950 */ 1951 hdr = &txhdr->vth_uhdr.hdr; 1952 m = *m_head; 1953 1954 error = ENOBUFS; 1955 1956 if (m->m_flags & M_VLANTAG) { 1957 //m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1958 m = vtnet_vlan_tag_insert(m); 1959 if ((*m_head = m) == NULL) 1960 goto fail; 1961 m->m_flags &= ~M_VLANTAG; 1962 } 1963 1964 if (m->m_pkthdr.csum_flags != 0) { 1965 m = vtnet_tx_offload(sc, m, hdr); 1966 if ((*m_head = m) == NULL) 1967 goto fail; 1968 } 1969 1970 error = vtnet_enqueue_txbuf(sc, m_head, txhdr); 1971 if (error == 0) 1972 sc->vtnet_txhdridx = 1973 (sc->vtnet_txhdridx + 1) % ((sc->vtnet_tx_size / 2) + 1); 1974 fail: 1975 return (error); 1976 } 1977 1978 static void 1979 vtnet_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 1980 { 1981 struct vtnet_softc *sc; 1982 1983 sc = ifp->if_softc; 1984 1985 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 1986 lwkt_serialize_enter(&sc->vtnet_slz); 1987 vtnet_start_locked(ifp, ifsq); 1988 lwkt_serialize_exit(&sc->vtnet_slz); 1989 } 1990 1991 static void 1992 vtnet_start_locked(struct ifnet *ifp, struct ifaltq_subque *ifsq) 1993 { 1994 struct vtnet_softc *sc; 1995 struct virtqueue *vq; 1996 struct mbuf *m0; 1997 int enq; 1998 1999 sc = ifp->if_softc; 2000 vq = sc->vtnet_tx_vq; 2001 enq = 0; 2002 2003 ASSERT_SERIALIZED(&sc->vtnet_slz); 2004 2005 if ((ifp->if_flags & (IFF_RUNNING)) != 2006 IFF_RUNNING || ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) 2007 return; 2008 2009 #ifdef VTNET_TX_INTR_MODERATION 2010 if (virtqueue_nused(vq) >= sc->vtnet_tx_size / 2) 2011 vtnet_txeof(sc); 2012 #endif 2013 2014 while (!ifsq_is_empty(ifsq)) { 2015 if (virtqueue_full(vq)) { 2016 ifq_set_oactive(&ifp->if_snd); 2017 break; 2018 } 2019 2020 m0 = ifq_dequeue(&ifp->if_snd); 2021 if (m0 == NULL) 2022 break; 2023 2024 if (vtnet_encap(sc, &m0) != 0) { 2025 if (m0 == NULL) 2026 break; 2027 ifq_prepend(&ifp->if_snd, m0); 2028 ifq_set_oactive(&ifp->if_snd); 2029 break; 2030 } 2031 2032 enq++; 2033 ETHER_BPF_MTAP(ifp, m0); 2034 } 2035 2036 if (enq > 0) { 2037 virtqueue_notify(vq, &sc->vtnet_slz); 2038 sc->vtnet_watchdog_timer = VTNET_WATCHDOG_TIMEOUT; 2039 } 2040 } 2041 2042 static void 2043 vtnet_tick(void *xsc) 2044 { 2045 struct vtnet_softc *sc; 2046 2047 sc = xsc; 2048 2049 #if 0 2050 ASSERT_SERIALIZED(&sc->vtnet_slz); 2051 #ifdef VTNET_DEBUG 2052 virtqueue_dump(sc->vtnet_rx_vq); 2053 virtqueue_dump(sc->vtnet_tx_vq); 2054 #endif 2055 2056 vtnet_watchdog(sc); 2057 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 2058 #endif 2059 } 2060 2061 static void 2062 vtnet_tx_intr_task(void *arg) 2063 { 2064 struct vtnet_softc *sc; 2065 struct ifnet *ifp; 2066 struct ifaltq_subque *ifsq; 2067 2068 sc = arg; 2069 ifp = sc->vtnet_ifp; 2070 ifsq = ifq_get_subq_default(&ifp->if_snd); 2071 2072 next: 2073 // lwkt_serialize_enter(&sc->vtnet_slz); 2074 2075 if ((ifp->if_flags & IFF_RUNNING) == 0) { 2076 vtnet_enable_tx_intr(sc); 2077 // lwkt_serialize_exit(&sc->vtnet_slz); 2078 return; 2079 } 2080 2081 vtnet_txeof(sc); 2082 2083 if (!ifsq_is_empty(ifsq)) 2084 vtnet_start_locked(ifp, ifsq); 2085 2086 if (vtnet_enable_tx_intr(sc) != 0) { 2087 vtnet_disable_tx_intr(sc); 2088 sc->vtnet_stats.tx_task_rescheduled++; 2089 // lwkt_serialize_exit(&sc->vtnet_slz); 2090 goto next; 2091 } 2092 2093 // lwkt_serialize_exit(&sc->vtnet_slz); 2094 } 2095 2096 static int 2097 vtnet_tx_vq_intr(void *xsc) 2098 { 2099 struct vtnet_softc *sc; 2100 2101 sc = xsc; 2102 2103 vtnet_disable_tx_intr(sc); 2104 vtnet_tx_intr_task(sc); 2105 2106 return (1); 2107 } 2108 2109 static void 2110 vtnet_stop(struct vtnet_softc *sc) 2111 { 2112 device_t dev; 2113 struct ifnet *ifp; 2114 2115 dev = sc->vtnet_dev; 2116 ifp = sc->vtnet_ifp; 2117 2118 ASSERT_SERIALIZED(&sc->vtnet_slz); 2119 2120 sc->vtnet_watchdog_timer = 0; 2121 callout_stop(&sc->vtnet_tick_ch); 2122 ifq_clr_oactive(&ifp->if_snd); 2123 ifp->if_flags &= ~(IFF_RUNNING); 2124 2125 vtnet_disable_rx_intr(sc); 2126 vtnet_disable_tx_intr(sc); 2127 2128 /* 2129 * Stop the host VirtIO adapter. Note this will reset the host 2130 * adapter's state back to the pre-initialized state, so in 2131 * order to make the device usable again, we must drive it 2132 * through virtio_reinit() and virtio_reinit_complete(). 2133 */ 2134 virtio_stop(dev); 2135 2136 sc->vtnet_flags &= ~VTNET_FLAG_LINK; 2137 2138 vtnet_free_rx_mbufs(sc); 2139 vtnet_free_tx_mbufs(sc); 2140 } 2141 2142 static int 2143 vtnet_reinit(struct vtnet_softc *sc) 2144 { 2145 struct ifnet *ifp; 2146 uint64_t features; 2147 2148 ifp = sc->vtnet_ifp; 2149 features = sc->vtnet_features; 2150 2151 /* 2152 * Re-negotiate with the host, removing any disabled receive 2153 * features. Transmit features are disabled only on our side 2154 * via if_capenable and if_hwassist. 2155 */ 2156 2157 if (ifp->if_capabilities & IFCAP_RXCSUM) { 2158 if ((ifp->if_capenable & IFCAP_RXCSUM) == 0) 2159 features &= ~VIRTIO_NET_F_GUEST_CSUM; 2160 } 2161 2162 if (ifp->if_capabilities & IFCAP_LRO) { 2163 if ((ifp->if_capenable & IFCAP_LRO) == 0) 2164 features &= ~VTNET_LRO_FEATURES; 2165 } 2166 2167 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) { 2168 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0) 2169 features &= ~VIRTIO_NET_F_CTRL_VLAN; 2170 } 2171 2172 return (virtio_reinit(sc->vtnet_dev, features)); 2173 } 2174 2175 static void 2176 vtnet_init_locked(struct vtnet_softc *sc) 2177 { 2178 device_t dev; 2179 struct ifnet *ifp; 2180 int error; 2181 2182 dev = sc->vtnet_dev; 2183 ifp = sc->vtnet_ifp; 2184 2185 ASSERT_SERIALIZED(&sc->vtnet_slz); 2186 2187 if (ifp->if_flags & IFF_RUNNING) 2188 return; 2189 2190 /* Stop host's adapter, cancel any pending I/O. */ 2191 vtnet_stop(sc); 2192 2193 /* Reinitialize the host device. */ 2194 error = vtnet_reinit(sc); 2195 if (error) { 2196 device_printf(dev, 2197 "reinitialization failed, stopping device...\n"); 2198 vtnet_stop(sc); 2199 return; 2200 } 2201 2202 /* Update host with assigned MAC address. */ 2203 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN); 2204 vtnet_set_hwaddr(sc); 2205 2206 ifp->if_hwassist = 0; 2207 if (ifp->if_capenable & IFCAP_TXCSUM) 2208 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD; 2209 if (ifp->if_capenable & IFCAP_TSO4) 2210 ifp->if_hwassist |= CSUM_TSO; 2211 2212 error = vtnet_init_rx_vq(sc); 2213 if (error) { 2214 device_printf(dev, 2215 "cannot allocate mbufs for Rx virtqueue\n"); 2216 vtnet_stop(sc); 2217 return; 2218 } 2219 2220 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) { 2221 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) { 2222 /* Restore promiscuous and all-multicast modes. */ 2223 vtnet_rx_filter(sc); 2224 2225 /* Restore filtered MAC addresses. */ 2226 vtnet_rx_filter_mac(sc); 2227 } 2228 2229 /* Restore VLAN filters. */ 2230 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) 2231 vtnet_rx_filter_vlan(sc); 2232 } 2233 2234 { 2235 vtnet_enable_rx_intr(sc); 2236 vtnet_enable_tx_intr(sc); 2237 } 2238 2239 ifp->if_flags |= IFF_RUNNING; 2240 ifq_clr_oactive(&ifp->if_snd); 2241 2242 virtio_reinit_complete(dev); 2243 2244 vtnet_update_link_status(sc); 2245 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc); 2246 } 2247 2248 static void 2249 vtnet_init(void *xsc) 2250 { 2251 struct vtnet_softc *sc; 2252 2253 sc = xsc; 2254 2255 lwkt_serialize_enter(&sc->vtnet_slz); 2256 vtnet_init_locked(sc); 2257 lwkt_serialize_exit(&sc->vtnet_slz); 2258 } 2259 2260 static void 2261 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie, 2262 struct sglist *sg, int readable, int writable) 2263 { 2264 struct virtqueue *vq; 2265 void *c; 2266 2267 vq = sc->vtnet_ctrl_vq; 2268 2269 ASSERT_SERIALIZED(&sc->vtnet_slz); 2270 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ, 2271 ("no control virtqueue")); 2272 KASSERT(virtqueue_empty(vq), 2273 ("control command already enqueued")); 2274 2275 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0) 2276 return; 2277 2278 virtqueue_notify(vq, &sc->vtnet_slz); 2279 2280 /* 2281 * Poll until the command is complete. Previously, we would 2282 * sleep until the control virtqueue interrupt handler woke 2283 * us up, but dropping the VTNET_MTX leads to serialization 2284 * difficulties. 2285 * 2286 * Furthermore, it appears QEMU/KVM only allocates three MSIX 2287 * vectors. Two of those vectors are needed for the Rx and Tx 2288 * virtqueues. We do not support sharing both a Vq and config 2289 * changed notification on the same MSIX vector. 2290 */ 2291 c = virtqueue_poll(vq, NULL); 2292 KASSERT(c == cookie, ("unexpected control command response")); 2293 } 2294 2295 static int 2296 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr) 2297 { 2298 struct { 2299 struct virtio_net_ctrl_hdr hdr __aligned(2); 2300 uint8_t pad1; 2301 char aligned_hwaddr[ETHER_ADDR_LEN] __aligned(8); 2302 uint8_t pad2; 2303 uint8_t ack; 2304 } s; 2305 struct sglist_seg segs[3]; 2306 struct sglist sg; 2307 int error; 2308 2309 s.hdr.class = VIRTIO_NET_CTRL_MAC; 2310 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET; 2311 s.ack = VIRTIO_NET_ERR; 2312 2313 /* Copy the mac address into physically contiguous memory */ 2314 memcpy(s.aligned_hwaddr, hwaddr, ETHER_ADDR_LEN); 2315 2316 sglist_init(&sg, 3, segs); 2317 error = 0; 2318 error |= sglist_append(&sg, &s.hdr, 2319 sizeof(struct virtio_net_ctrl_hdr)); 2320 error |= sglist_append(&sg, s.aligned_hwaddr, ETHER_ADDR_LEN); 2321 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t)); 2322 KASSERT(error == 0 && sg.sg_nseg == 3, 2323 ("%s: error %d adding set MAC msg to sglist", __func__, error)); 2324 2325 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1); 2326 2327 return (s.ack == VIRTIO_NET_OK ? 0 : EIO); 2328 } 2329 2330 static void 2331 vtnet_rx_filter(struct vtnet_softc *sc) 2332 { 2333 device_t dev; 2334 struct ifnet *ifp; 2335 2336 dev = sc->vtnet_dev; 2337 ifp = sc->vtnet_ifp; 2338 2339 ASSERT_SERIALIZED(&sc->vtnet_slz); 2340 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 2341 ("CTRL_RX feature not negotiated")); 2342 2343 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) 2344 device_printf(dev, "cannot %s promiscuous mode\n", 2345 ifp->if_flags & IFF_PROMISC ? "enable" : "disable"); 2346 2347 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) 2348 device_printf(dev, "cannot %s all-multicast mode\n", 2349 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable"); 2350 } 2351 2352 static int 2353 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on) 2354 { 2355 struct virtio_net_ctrl_hdr hdr __aligned(2); 2356 struct sglist_seg segs[3]; 2357 struct sglist sg; 2358 uint8_t onoff, ack; 2359 int error; 2360 2361 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0) 2362 return (ENOTSUP); 2363 2364 error = 0; 2365 2366 hdr.class = VIRTIO_NET_CTRL_RX; 2367 hdr.cmd = cmd; 2368 onoff = !!on; 2369 ack = VIRTIO_NET_ERR; 2370 2371 sglist_init(&sg, 3, segs); 2372 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2373 error |= sglist_append(&sg, &onoff, sizeof(uint8_t)); 2374 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2375 KASSERT(error == 0 && sg.sg_nseg == 3, 2376 ("error adding Rx filter message to sglist")); 2377 2378 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2379 2380 return (ack == VIRTIO_NET_OK ? 0 : EIO); 2381 } 2382 2383 static int 2384 vtnet_set_promisc(struct vtnet_softc *sc, int on) 2385 { 2386 2387 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on)); 2388 } 2389 2390 static int 2391 vtnet_set_allmulti(struct vtnet_softc *sc, int on) 2392 { 2393 2394 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on)); 2395 } 2396 2397 static void 2398 vtnet_rx_filter_mac(struct vtnet_softc *sc) 2399 { 2400 struct virtio_net_ctrl_hdr hdr __aligned(2); 2401 struct vtnet_mac_filter *filter; 2402 struct sglist_seg segs[4]; 2403 struct sglist sg; 2404 struct ifnet *ifp; 2405 struct ifaddr *ifa; 2406 struct ifaddr_container *ifac; 2407 struct ifmultiaddr *ifma; 2408 int ucnt, mcnt, promisc, allmulti, error; 2409 uint8_t ack; 2410 2411 ifp = sc->vtnet_ifp; 2412 ucnt = 0; 2413 mcnt = 0; 2414 promisc = 0; 2415 allmulti = 0; 2416 error = 0; 2417 2418 ASSERT_SERIALIZED(&sc->vtnet_slz); 2419 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX, 2420 ("CTRL_RX feature not negotiated")); 2421 2422 /* Use the MAC filtering table allocated in vtnet_attach. */ 2423 filter = sc->vtnet_macfilter; 2424 memset(filter, 0, sizeof(struct vtnet_mac_filter)); 2425 2426 /* Unicast MAC addresses: */ 2427 //if_addr_rlock(ifp); 2428 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2429 ifa = ifac->ifa; 2430 if (ifa->ifa_addr->sa_family != AF_LINK) 2431 continue; 2432 else if (ucnt == VTNET_MAX_MAC_ENTRIES) 2433 break; 2434 2435 bcopy(LLADDR((struct sockaddr_dl *)ifa->ifa_addr), 2436 &filter->vmf_unicast.macs[ucnt], ETHER_ADDR_LEN); 2437 ucnt++; 2438 } 2439 //if_addr_runlock(ifp); 2440 2441 if (ucnt >= VTNET_MAX_MAC_ENTRIES) { 2442 promisc = 1; 2443 filter->vmf_unicast.nentries = 0; 2444 2445 if_printf(ifp, "more than %d MAC addresses assigned, " 2446 "falling back to promiscuous mode\n", 2447 VTNET_MAX_MAC_ENTRIES); 2448 } else 2449 filter->vmf_unicast.nentries = ucnt; 2450 2451 /* Multicast MAC addresses: */ 2452 //if_maddr_rlock(ifp); 2453 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2454 if (ifma->ifma_addr->sa_family != AF_LINK) 2455 continue; 2456 else if (mcnt == VTNET_MAX_MAC_ENTRIES) 2457 break; 2458 2459 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 2460 &filter->vmf_multicast.macs[mcnt], ETHER_ADDR_LEN); 2461 mcnt++; 2462 } 2463 //if_maddr_runlock(ifp); 2464 2465 if (mcnt >= VTNET_MAX_MAC_ENTRIES) { 2466 allmulti = 1; 2467 filter->vmf_multicast.nentries = 0; 2468 2469 if_printf(ifp, "more than %d multicast MAC addresses " 2470 "assigned, falling back to all-multicast mode\n", 2471 VTNET_MAX_MAC_ENTRIES); 2472 } else 2473 filter->vmf_multicast.nentries = mcnt; 2474 2475 if (promisc && allmulti) 2476 goto out; 2477 2478 hdr.class = VIRTIO_NET_CTRL_MAC; 2479 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 2480 ack = VIRTIO_NET_ERR; 2481 2482 sglist_init(&sg, 4, segs); 2483 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2484 error |= sglist_append(&sg, &filter->vmf_unicast, 2485 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN); 2486 error |= sglist_append(&sg, &filter->vmf_multicast, 2487 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN); 2488 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2489 KASSERT(error == 0 && sg.sg_nseg == 4, 2490 ("error adding MAC filtering message to sglist")); 2491 2492 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2493 2494 if (ack != VIRTIO_NET_OK) 2495 if_printf(ifp, "error setting host MAC filter table\n"); 2496 2497 out: 2498 if (promisc) 2499 if (vtnet_set_promisc(sc, 1) != 0) 2500 if_printf(ifp, "cannot enable promiscuous mode\n"); 2501 if (allmulti) 2502 if (vtnet_set_allmulti(sc, 1) != 0) 2503 if_printf(ifp, "cannot enable all-multicast mode\n"); 2504 } 2505 2506 static int 2507 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 2508 { 2509 struct virtio_net_ctrl_hdr hdr __aligned(2); 2510 struct sglist_seg segs[3]; 2511 struct sglist sg; 2512 uint8_t ack; 2513 int error; 2514 2515 hdr.class = VIRTIO_NET_CTRL_VLAN; 2516 hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL; 2517 ack = VIRTIO_NET_ERR; 2518 error = 0; 2519 2520 sglist_init(&sg, 3, segs); 2521 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr)); 2522 error |= sglist_append(&sg, &tag, sizeof(uint16_t)); 2523 error |= sglist_append(&sg, &ack, sizeof(uint8_t)); 2524 KASSERT(error == 0 && sg.sg_nseg == 3, 2525 ("error adding VLAN control message to sglist")); 2526 2527 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1); 2528 2529 return (ack == VIRTIO_NET_OK ? 0 : EIO); 2530 } 2531 2532 static void 2533 vtnet_rx_filter_vlan(struct vtnet_softc *sc) 2534 { 2535 device_t dev; 2536 uint32_t w, mask; 2537 uint16_t tag; 2538 int i, nvlans, error; 2539 2540 ASSERT_SERIALIZED(&sc->vtnet_slz); 2541 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 2542 ("VLAN_FILTER feature not negotiated")); 2543 2544 dev = sc->vtnet_dev; 2545 nvlans = sc->vtnet_nvlans; 2546 error = 0; 2547 2548 /* Enable filtering for each configured VLAN. */ 2549 for (i = 0; i < VTNET_VLAN_SHADOW_SIZE && nvlans > 0; i++) { 2550 w = sc->vtnet_vlan_shadow[i]; 2551 for (mask = 1, tag = i * 32; w != 0; mask <<= 1, tag++) { 2552 if ((w & mask) != 0) { 2553 w &= ~mask; 2554 nvlans--; 2555 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) 2556 error++; 2557 } 2558 } 2559 } 2560 2561 KASSERT(nvlans == 0, ("VLAN count incorrect")); 2562 if (error) 2563 device_printf(dev, "cannot restore VLAN filter table\n"); 2564 } 2565 2566 static void 2567 vtnet_set_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag) 2568 { 2569 struct ifnet *ifp; 2570 int idx, bit; 2571 2572 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER, 2573 ("VLAN_FILTER feature not negotiated")); 2574 2575 if ((tag == 0) || (tag > 4095)) 2576 return; 2577 2578 ifp = sc->vtnet_ifp; 2579 idx = (tag >> 5) & 0x7F; 2580 bit = tag & 0x1F; 2581 2582 lwkt_serialize_enter(&sc->vtnet_slz); 2583 2584 /* Update shadow VLAN table. */ 2585 if (add) { 2586 sc->vtnet_nvlans++; 2587 sc->vtnet_vlan_shadow[idx] |= (1 << bit); 2588 } else { 2589 sc->vtnet_nvlans--; 2590 sc->vtnet_vlan_shadow[idx] &= ~(1 << bit); 2591 } 2592 2593 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER) { 2594 if (vtnet_exec_vlan_filter(sc, add, tag) != 0) { 2595 device_printf(sc->vtnet_dev, 2596 "cannot %s VLAN %d %s the host filter table\n", 2597 add ? "add" : "remove", tag, 2598 add ? "to" : "from"); 2599 } 2600 } 2601 2602 lwkt_serialize_exit(&sc->vtnet_slz); 2603 } 2604 2605 static void 2606 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 2607 { 2608 2609 if (ifp->if_softc != arg) 2610 return; 2611 2612 vtnet_set_vlan_filter(arg, 1, tag); 2613 } 2614 2615 static void 2616 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag) 2617 { 2618 2619 if (ifp->if_softc != arg) 2620 return; 2621 2622 vtnet_set_vlan_filter(arg, 0, tag); 2623 } 2624 2625 static int 2626 vtnet_ifmedia_upd(struct ifnet *ifp) 2627 { 2628 struct vtnet_softc *sc; 2629 struct ifmedia *ifm; 2630 2631 sc = ifp->if_softc; 2632 ifm = &sc->vtnet_media; 2633 2634 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) 2635 return (EINVAL); 2636 2637 return (0); 2638 } 2639 2640 static void 2641 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 2642 { 2643 struct vtnet_softc *sc; 2644 2645 sc = ifp->if_softc; 2646 2647 ifmr->ifm_status = IFM_AVALID; 2648 ifmr->ifm_active = IFM_ETHER; 2649 2650 lwkt_serialize_enter(&sc->vtnet_slz); 2651 if (vtnet_is_link_up(sc) != 0) { 2652 ifmr->ifm_status |= IFM_ACTIVE; 2653 ifmr->ifm_active |= VTNET_MEDIATYPE; 2654 } else 2655 ifmr->ifm_active |= IFM_NONE; 2656 lwkt_serialize_exit(&sc->vtnet_slz); 2657 } 2658 2659 static void 2660 vtnet_add_statistics(struct vtnet_softc *sc) 2661 { 2662 device_t dev; 2663 struct vtnet_statistics *stats; 2664 struct sysctl_ctx_list *ctx; 2665 struct sysctl_oid *tree; 2666 struct sysctl_oid_list *child; 2667 2668 dev = sc->vtnet_dev; 2669 stats = &sc->vtnet_stats; 2670 ctx = device_get_sysctl_ctx(dev); 2671 tree = device_get_sysctl_tree(dev); 2672 child = SYSCTL_CHILDREN(tree); 2673 2674 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "mbuf_alloc_failed", 2675 CTLFLAG_RD, &stats->mbuf_alloc_failed, 2676 "Mbuf cluster allocation failures"); 2677 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_frame_too_large", 2678 CTLFLAG_RD, &stats->rx_frame_too_large, 2679 "Received frame larger than the mbuf chain"); 2680 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_enq_replacement_failed", 2681 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 2682 "Enqueuing the replacement receive mbuf failed"); 2683 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_mergeable_failed", 2684 CTLFLAG_RD, &stats->rx_mergeable_failed, 2685 "Mergeable buffers receive failures"); 2686 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_ethtype", 2687 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 2688 "Received checksum offloaded buffer with unsupported " 2689 "Ethernet type"); 2690 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_start", 2691 CTLFLAG_RD, &stats->rx_csum_bad_start, 2692 "Received checksum offloaded buffer with incorrect start offset"); 2693 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_ipproto", 2694 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 2695 "Received checksum offloaded buffer with incorrect IP protocol"); 2696 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_bad_offset", 2697 CTLFLAG_RD, &stats->rx_csum_bad_offset, 2698 "Received checksum offloaded buffer with incorrect offset"); 2699 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_failed", 2700 CTLFLAG_RD, &stats->rx_csum_failed, 2701 "Received buffer checksum offload failed"); 2702 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_csum_offloaded", 2703 CTLFLAG_RD, &stats->rx_csum_offloaded, 2704 "Received buffer checksum offload succeeded"); 2705 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_task_rescheduled", 2706 CTLFLAG_RD, &stats->rx_task_rescheduled, 2707 "Times the receive interrupt task rescheduled itself"); 2708 2709 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_csum_offloaded", 2710 CTLFLAG_RD, &stats->tx_csum_offloaded, 2711 "Offloaded checksum of transmitted buffer"); 2712 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_tso_offloaded", 2713 CTLFLAG_RD, &stats->tx_tso_offloaded, 2714 "Segmentation offload of transmitted buffer"); 2715 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_csum_bad_ethtype", 2716 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 2717 "Aborted transmit of checksum offloaded buffer with unknown " 2718 "Ethernet type"); 2719 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_tso_bad_ethtype", 2720 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 2721 "Aborted transmit of TSO buffer with unknown Ethernet type"); 2722 SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "tx_task_rescheduled", 2723 CTLFLAG_RD, &stats->tx_task_rescheduled, 2724 "Times the transmit interrupt task rescheduled itself"); 2725 } 2726 2727 static int 2728 vtnet_enable_rx_intr(struct vtnet_softc *sc) 2729 { 2730 2731 return (virtqueue_enable_intr(sc->vtnet_rx_vq)); 2732 } 2733 2734 static void 2735 vtnet_disable_rx_intr(struct vtnet_softc *sc) 2736 { 2737 2738 virtqueue_disable_intr(sc->vtnet_rx_vq); 2739 } 2740 2741 static int 2742 vtnet_enable_tx_intr(struct vtnet_softc *sc) 2743 { 2744 2745 #ifdef VTNET_TX_INTR_MODERATION 2746 return (0); 2747 #else 2748 return (virtqueue_enable_intr(sc->vtnet_tx_vq)); 2749 #endif 2750 } 2751 2752 static void 2753 vtnet_disable_tx_intr(struct vtnet_softc *sc) 2754 { 2755 2756 virtqueue_disable_intr(sc->vtnet_tx_vq); 2757 } 2758