if_cue.c revision 188412
1/*- 2 * Copyright (c) 1997, 1998, 1999, 2000 3 * Bill Paul <wpaul@ee.columbia.edu>. 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, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/dev/usb2/ethernet/if_cue2.c 188412 2009-02-09 22:02:38Z thompsa $"); 35 36/* 37 * CATC USB-EL1210A USB to ethernet driver. Used in the CATC Netmate 38 * adapters and others. 39 * 40 * Written by Bill Paul <wpaul@ee.columbia.edu> 41 * Electrical Engineering Department 42 * Columbia University, New York City 43 */ 44 45/* 46 * The CATC USB-EL1210A provides USB ethernet support at 10Mbps. The 47 * RX filter uses a 512-bit multicast hash table, single perfect entry 48 * for the station address, and promiscuous mode. Unlike the ADMtek 49 * and KLSI chips, the CATC ASIC supports read and write combining 50 * mode where multiple packets can be transfered using a single bulk 51 * transaction, which helps performance a great deal. 52 */ 53 54#include <dev/usb2/include/usb2_devid.h> 55#include <dev/usb2/include/usb2_standard.h> 56#include <dev/usb2/include/usb2_mfunc.h> 57#include <dev/usb2/include/usb2_error.h> 58 59#define USB_DEBUG_VAR cue_debug 60 61#include <dev/usb2/core/usb2_core.h> 62#include <dev/usb2/core/usb2_lookup.h> 63#include <dev/usb2/core/usb2_process.h> 64#include <dev/usb2/core/usb2_debug.h> 65#include <dev/usb2/core/usb2_request.h> 66#include <dev/usb2/core/usb2_busdma.h> 67#include <dev/usb2/core/usb2_util.h> 68 69#include <dev/usb2/ethernet/usb2_ethernet.h> 70#include <dev/usb2/ethernet/if_cuereg.h> 71 72/* 73 * Various supported device vendors/products. 74 */ 75 76/* Belkin F5U111 adapter covered by NETMATE entry */ 77 78static const struct usb2_device_id cue_devs[] = { 79 {USB_VPI(USB_VENDOR_CATC, USB_PRODUCT_CATC_NETMATE, 0)}, 80 {USB_VPI(USB_VENDOR_CATC, USB_PRODUCT_CATC_NETMATE2, 0)}, 81 {USB_VPI(USB_VENDOR_SMARTBRIDGES, USB_PRODUCT_SMARTBRIDGES_SMARTLINK, 0)}, 82}; 83 84/* prototypes */ 85 86static device_probe_t cue_probe; 87static device_attach_t cue_attach; 88static device_detach_t cue_detach; 89static device_shutdown_t cue_shutdown; 90 91static usb2_callback_t cue_bulk_read_callback; 92static usb2_callback_t cue_bulk_write_callback; 93 94static usb2_ether_fn_t cue_attach_post; 95static usb2_ether_fn_t cue_init; 96static usb2_ether_fn_t cue_stop; 97static usb2_ether_fn_t cue_start; 98static usb2_ether_fn_t cue_tick; 99static usb2_ether_fn_t cue_setmulti; 100static usb2_ether_fn_t cue_setpromisc; 101 102static uint8_t cue_csr_read_1(struct cue_softc *, uint16_t); 103static uint16_t cue_csr_read_2(struct cue_softc *, uint8_t); 104static int cue_csr_write_1(struct cue_softc *, uint16_t, uint16_t); 105static int cue_mem(struct cue_softc *, uint8_t, uint16_t, void *, int); 106static int cue_getmac(struct cue_softc *, void *); 107static uint32_t cue_mchash(const uint8_t *); 108static void cue_reset(struct cue_softc *); 109 110#if USB_DEBUG 111static int cue_debug = 0; 112 113SYSCTL_NODE(_hw_usb2, OID_AUTO, cue, CTLFLAG_RW, 0, "USB cue"); 114SYSCTL_INT(_hw_usb2_cue, OID_AUTO, debug, CTLFLAG_RW, &cue_debug, 0, 115 "Debug level"); 116#endif 117 118static const struct usb2_config cue_config[CUE_N_TRANSFER] = { 119 120 [CUE_BULK_DT_WR] = { 121 .type = UE_BULK, 122 .endpoint = UE_ADDR_ANY, 123 .direction = UE_DIR_OUT, 124 .mh.bufsize = (MCLBYTES + 2), 125 .mh.flags = {.pipe_bof = 1,}, 126 .mh.callback = cue_bulk_write_callback, 127 .mh.timeout = 10000, /* 10 seconds */ 128 }, 129 130 [CUE_BULK_DT_RD] = { 131 .type = UE_BULK, 132 .endpoint = UE_ADDR_ANY, 133 .direction = UE_DIR_IN, 134 .mh.bufsize = (MCLBYTES + 2), 135 .mh.flags = {.pipe_bof = 1,.short_xfer_ok = 1,}, 136 .mh.callback = cue_bulk_read_callback, 137 }, 138}; 139 140static device_method_t cue_methods[] = { 141 /* Device interface */ 142 DEVMETHOD(device_probe, cue_probe), 143 DEVMETHOD(device_attach, cue_attach), 144 DEVMETHOD(device_detach, cue_detach), 145 DEVMETHOD(device_shutdown, cue_shutdown), 146 147 {0, 0} 148}; 149 150static driver_t cue_driver = { 151 .name = "cue", 152 .methods = cue_methods, 153 .size = sizeof(struct cue_softc), 154}; 155 156static devclass_t cue_devclass; 157 158DRIVER_MODULE(cue, ushub, cue_driver, cue_devclass, NULL, 0); 159MODULE_DEPEND(cue, usb2_ethernet, 1, 1, 1); 160MODULE_DEPEND(cue, usb2_core, 1, 1, 1); 161MODULE_DEPEND(cue, ether, 1, 1, 1); 162 163static const struct usb2_ether_methods cue_ue_methods = { 164 .ue_attach_post = cue_attach_post, 165 .ue_start = cue_start, 166 .ue_init = cue_init, 167 .ue_stop = cue_stop, 168 .ue_tick = cue_tick, 169 .ue_setmulti = cue_setmulti, 170 .ue_setpromisc = cue_setpromisc, 171}; 172 173#define CUE_SETBIT(sc, reg, x) \ 174 cue_csr_write_1(sc, reg, cue_csr_read_1(sc, reg) | (x)) 175 176#define CUE_CLRBIT(sc, reg, x) \ 177 cue_csr_write_1(sc, reg, cue_csr_read_1(sc, reg) & ~(x)) 178 179static uint8_t 180cue_csr_read_1(struct cue_softc *sc, uint16_t reg) 181{ 182 struct usb2_device_request req; 183 uint8_t val; 184 185 req.bmRequestType = UT_READ_VENDOR_DEVICE; 186 req.bRequest = CUE_CMD_READREG; 187 USETW(req.wValue, 0); 188 USETW(req.wIndex, reg); 189 USETW(req.wLength, 1); 190 191 if (usb2_ether_do_request(&sc->sc_ue, &req, &val, 1000)) { 192 /* ignore any errors */ 193 } 194 return (val); 195} 196 197static uint16_t 198cue_csr_read_2(struct cue_softc *sc, uint8_t reg) 199{ 200 struct usb2_device_request req; 201 uint16_t val; 202 203 req.bmRequestType = UT_READ_VENDOR_DEVICE; 204 req.bRequest = CUE_CMD_READREG; 205 USETW(req.wValue, 0); 206 USETW(req.wIndex, reg); 207 USETW(req.wLength, 2); 208 209 (void)usb2_ether_do_request(&sc->sc_ue, &req, &val, 1000); 210 return (le16toh(val)); 211} 212 213static int 214cue_csr_write_1(struct cue_softc *sc, uint16_t reg, uint16_t val) 215{ 216 struct usb2_device_request req; 217 218 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 219 req.bRequest = CUE_CMD_WRITEREG; 220 USETW(req.wValue, val); 221 USETW(req.wIndex, reg); 222 USETW(req.wLength, 0); 223 224 return (usb2_ether_do_request(&sc->sc_ue, &req, NULL, 1000)); 225} 226 227static int 228cue_mem(struct cue_softc *sc, uint8_t cmd, uint16_t addr, void *buf, int len) 229{ 230 struct usb2_device_request req; 231 232 if (cmd == CUE_CMD_READSRAM) 233 req.bmRequestType = UT_READ_VENDOR_DEVICE; 234 else 235 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 236 req.bRequest = cmd; 237 USETW(req.wValue, 0); 238 USETW(req.wIndex, addr); 239 USETW(req.wLength, len); 240 241 return (usb2_ether_do_request(&sc->sc_ue, &req, buf, 1000)); 242} 243 244static int 245cue_getmac(struct cue_softc *sc, void *buf) 246{ 247 struct usb2_device_request req; 248 249 req.bmRequestType = UT_READ_VENDOR_DEVICE; 250 req.bRequest = CUE_CMD_GET_MACADDR; 251 USETW(req.wValue, 0); 252 USETW(req.wIndex, 0); 253 USETW(req.wLength, ETHER_ADDR_LEN); 254 255 return (usb2_ether_do_request(&sc->sc_ue, &req, buf, 1000)); 256} 257 258#define CUE_BITS 9 259 260static uint32_t 261cue_mchash(const uint8_t *addr) 262{ 263 uint32_t crc; 264 265 /* Compute CRC for the address value. */ 266 crc = ether_crc32_le(addr, ETHER_ADDR_LEN); 267 268 return (crc & ((1 << CUE_BITS) - 1)); 269} 270 271static void 272cue_setpromisc(struct usb2_ether *ue) 273{ 274 struct cue_softc *sc = usb2_ether_getsc(ue); 275 struct ifnet *ifp = usb2_ether_getifp(ue); 276 277 CUE_LOCK_ASSERT(sc, MA_OWNED); 278 279 /* if we want promiscuous mode, set the allframes bit */ 280 if (ifp->if_flags & IFF_PROMISC) 281 CUE_SETBIT(sc, CUE_ETHCTL, CUE_ETHCTL_PROMISC); 282 else 283 CUE_CLRBIT(sc, CUE_ETHCTL, CUE_ETHCTL_PROMISC); 284 285 /* write multicast hash-bits */ 286 cue_setmulti(ue); 287} 288 289static void 290cue_setmulti(struct usb2_ether *ue) 291{ 292 struct cue_softc *sc = usb2_ether_getsc(ue); 293 struct ifnet *ifp = usb2_ether_getifp(ue); 294 struct ifmultiaddr *ifma; 295 uint32_t h = 0, i; 296 uint8_t hashtbl[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 297 298 CUE_LOCK_ASSERT(sc, MA_OWNED); 299 300 if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) { 301 for (i = 0; i < 8; i++) 302 hashtbl[i] = 0xff; 303 cue_mem(sc, CUE_CMD_WRITESRAM, CUE_MCAST_TABLE_ADDR, 304 &hashtbl, 8); 305 return; 306 } 307 308 /* now program new ones */ 309 IF_ADDR_LOCK(ifp); 310 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 311 { 312 if (ifma->ifma_addr->sa_family != AF_LINK) 313 continue; 314 h = cue_mchash(LLADDR((struct sockaddr_dl *)ifma->ifma_addr)); 315 hashtbl[h >> 3] |= 1 << (h & 0x7); 316 } 317 IF_ADDR_UNLOCK(ifp); 318 319 /* 320 * Also include the broadcast address in the filter 321 * so we can receive broadcast frames. 322 */ 323 if (ifp->if_flags & IFF_BROADCAST) { 324 h = cue_mchash(ifp->if_broadcastaddr); 325 hashtbl[h >> 3] |= 1 << (h & 0x7); 326 } 327 328 cue_mem(sc, CUE_CMD_WRITESRAM, CUE_MCAST_TABLE_ADDR, &hashtbl, 8); 329} 330 331static void 332cue_reset(struct cue_softc *sc) 333{ 334 struct usb2_device_request req; 335 336 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 337 req.bRequest = CUE_CMD_RESET; 338 USETW(req.wValue, 0); 339 USETW(req.wIndex, 0); 340 USETW(req.wLength, 0); 341 342 if (usb2_ether_do_request(&sc->sc_ue, &req, NULL, 1000)) { 343 /* ignore any errors */ 344 } 345 346 /* 347 * wait a little while for the chip to get its brains in order: 348 */ 349 usb2_ether_pause(&sc->sc_ue, hz / 100); 350} 351 352static void 353cue_attach_post(struct usb2_ether *ue) 354{ 355 struct cue_softc *sc = usb2_ether_getsc(ue); 356 357 cue_getmac(sc, ue->ue_eaddr); 358} 359 360static int 361cue_probe(device_t dev) 362{ 363 struct usb2_attach_arg *uaa = device_get_ivars(dev); 364 365 if (uaa->usb2_mode != USB_MODE_HOST) 366 return (ENXIO); 367 if (uaa->info.bConfigIndex != CUE_CONFIG_IDX) 368 return (ENXIO); 369 if (uaa->info.bIfaceIndex != CUE_IFACE_IDX) 370 return (ENXIO); 371 372 return (usb2_lookup_id_by_uaa(cue_devs, sizeof(cue_devs), uaa)); 373} 374 375/* 376 * Attach the interface. Allocate softc structures, do ifmedia 377 * setup and ethernet/BPF attach. 378 */ 379static int 380cue_attach(device_t dev) 381{ 382 struct usb2_attach_arg *uaa = device_get_ivars(dev); 383 struct cue_softc *sc = device_get_softc(dev); 384 struct usb2_ether *ue = &sc->sc_ue; 385 uint8_t iface_index; 386 int error; 387 388 device_set_usb2_desc(dev); 389 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF); 390 391 iface_index = CUE_IFACE_IDX; 392 error = usb2_transfer_setup(uaa->device, &iface_index, 393 sc->sc_xfer, cue_config, CUE_N_TRANSFER, sc, &sc->sc_mtx); 394 if (error) { 395 device_printf(dev, "allocating USB transfers failed!\n"); 396 goto detach; 397 } 398 399 ue->ue_sc = sc; 400 ue->ue_dev = dev; 401 ue->ue_udev = uaa->device; 402 ue->ue_mtx = &sc->sc_mtx; 403 ue->ue_methods = &cue_ue_methods; 404 405 error = usb2_ether_ifattach(ue); 406 if (error) { 407 device_printf(dev, "could not attach interface\n"); 408 goto detach; 409 } 410 return (0); /* success */ 411 412detach: 413 cue_detach(dev); 414 return (ENXIO); /* failure */ 415} 416 417static int 418cue_detach(device_t dev) 419{ 420 struct cue_softc *sc = device_get_softc(dev); 421 struct usb2_ether *ue = &sc->sc_ue; 422 423 usb2_transfer_unsetup(sc->sc_xfer, CUE_N_TRANSFER); 424 usb2_ether_ifdetach(ue); 425 mtx_destroy(&sc->sc_mtx); 426 427 return (0); 428} 429 430static void 431cue_bulk_read_callback(struct usb2_xfer *xfer) 432{ 433 struct cue_softc *sc = xfer->priv_sc; 434 struct usb2_ether *ue = &sc->sc_ue; 435 struct ifnet *ifp = usb2_ether_getifp(ue); 436 uint8_t buf[2]; 437 int len; 438 439 switch (USB_GET_STATE(xfer)) { 440 case USB_ST_TRANSFERRED: 441 442 if (xfer->actlen <= (2 + sizeof(struct ether_header))) { 443 ifp->if_ierrors++; 444 goto tr_setup; 445 } 446 usb2_copy_out(xfer->frbuffers, 0, buf, 2); 447 xfer->actlen -= 2; 448 len = buf[0] | (buf[1] << 8); 449 len = min(xfer->actlen, len); 450 451 usb2_ether_rxbuf(ue, xfer->frbuffers, 2, len); 452 /* FALLTHROUGH */ 453 case USB_ST_SETUP: 454tr_setup: 455 xfer->frlengths[0] = xfer->max_data_length; 456 usb2_start_hardware(xfer); 457 usb2_ether_rxflush(ue); 458 return; 459 460 default: /* Error */ 461 DPRINTF("bulk read error, %s\n", 462 usb2_errstr(xfer->error)); 463 464 if (xfer->error != USB_ERR_CANCELLED) { 465 /* try to clear stall first */ 466 xfer->flags.stall_pipe = 1; 467 goto tr_setup; 468 } 469 return; 470 471 } 472} 473 474static void 475cue_bulk_write_callback(struct usb2_xfer *xfer) 476{ 477 struct cue_softc *sc = xfer->priv_sc; 478 struct ifnet *ifp = usb2_ether_getifp(&sc->sc_ue); 479 struct mbuf *m; 480 uint8_t buf[2]; 481 482 switch (USB_GET_STATE(xfer)) { 483 case USB_ST_TRANSFERRED: 484 DPRINTFN(11, "transfer complete\n"); 485 ifp->if_opackets++; 486 487 /* FALLTHROUGH */ 488 case USB_ST_SETUP: 489tr_setup: 490 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 491 492 if (m == NULL) 493 return; 494 if (m->m_pkthdr.len > MCLBYTES) 495 m->m_pkthdr.len = MCLBYTES; 496 xfer->frlengths[0] = (m->m_pkthdr.len + 2); 497 498 /* the first two bytes are the frame length */ 499 500 buf[0] = (uint8_t)(m->m_pkthdr.len); 501 buf[1] = (uint8_t)(m->m_pkthdr.len >> 8); 502 503 usb2_copy_in(xfer->frbuffers, 0, buf, 2); 504 505 usb2_m_copy_in(xfer->frbuffers, 2, 506 m, 0, m->m_pkthdr.len); 507 508 /* 509 * If there's a BPF listener, bounce a copy of this frame 510 * to him. 511 */ 512 BPF_MTAP(ifp, m); 513 514 m_freem(m); 515 516 usb2_start_hardware(xfer); 517 518 return; 519 520 default: /* Error */ 521 DPRINTFN(11, "transfer error, %s\n", 522 usb2_errstr(xfer->error)); 523 524 ifp->if_oerrors++; 525 526 if (xfer->error != USB_ERR_CANCELLED) { 527 /* try to clear stall first */ 528 xfer->flags.stall_pipe = 1; 529 goto tr_setup; 530 } 531 return; 532 } 533} 534 535static void 536cue_tick(struct usb2_ether *ue) 537{ 538 struct cue_softc *sc = usb2_ether_getsc(ue); 539 struct ifnet *ifp = usb2_ether_getifp(ue); 540 541 CUE_LOCK_ASSERT(sc, MA_OWNED); 542 543 ifp->if_collisions += cue_csr_read_2(sc, CUE_TX_SINGLECOLL); 544 ifp->if_collisions += cue_csr_read_2(sc, CUE_TX_MULTICOLL); 545 ifp->if_collisions += cue_csr_read_2(sc, CUE_TX_EXCESSCOLL); 546 547 if (cue_csr_read_2(sc, CUE_RX_FRAMEERR)) 548 ifp->if_ierrors++; 549} 550 551static void 552cue_start(struct usb2_ether *ue) 553{ 554 struct cue_softc *sc = usb2_ether_getsc(ue); 555 556 /* 557 * start the USB transfers, if not already started: 558 */ 559 usb2_transfer_start(sc->sc_xfer[CUE_BULK_DT_RD]); 560 usb2_transfer_start(sc->sc_xfer[CUE_BULK_DT_WR]); 561} 562 563static void 564cue_init(struct usb2_ether *ue) 565{ 566 struct cue_softc *sc = usb2_ether_getsc(ue); 567 struct ifnet *ifp = usb2_ether_getifp(ue); 568 int i; 569 570 CUE_LOCK_ASSERT(sc, MA_OWNED); 571 572 /* 573 * Cancel pending I/O and free all RX/TX buffers. 574 */ 575 cue_stop(ue); 576#if 0 577 cue_reset(sc); 578#endif 579 /* Set MAC address */ 580 for (i = 0; i < ETHER_ADDR_LEN; i++) 581 cue_csr_write_1(sc, CUE_PAR0 - i, IF_LLADDR(ifp)[i]); 582 583 /* Enable RX logic. */ 584 cue_csr_write_1(sc, CUE_ETHCTL, CUE_ETHCTL_RX_ON | CUE_ETHCTL_MCAST_ON); 585 586 /* Load the multicast filter */ 587 cue_setpromisc(ue); 588 589 /* 590 * Set the number of RX and TX buffers that we want 591 * to reserve inside the ASIC. 592 */ 593 cue_csr_write_1(sc, CUE_RX_BUFPKTS, CUE_RX_FRAMES); 594 cue_csr_write_1(sc, CUE_TX_BUFPKTS, CUE_TX_FRAMES); 595 596 /* Set advanced operation modes. */ 597 cue_csr_write_1(sc, CUE_ADVANCED_OPMODES, 598 CUE_AOP_EMBED_RXLEN | 0x01);/* 1 wait state */ 599 600 /* Program the LED operation. */ 601 cue_csr_write_1(sc, CUE_LEDCTL, CUE_LEDCTL_FOLLOW_LINK); 602 603 usb2_transfer_set_stall(sc->sc_xfer[CUE_BULK_DT_WR]); 604 605 ifp->if_drv_flags |= IFF_DRV_RUNNING; 606 cue_start(ue); 607} 608 609/* 610 * Stop the adapter and free any mbufs allocated to the 611 * RX and TX lists. 612 */ 613static void 614cue_stop(struct usb2_ether *ue) 615{ 616 struct cue_softc *sc = usb2_ether_getsc(ue); 617 struct ifnet *ifp = usb2_ether_getifp(ue); 618 619 CUE_LOCK_ASSERT(sc, MA_OWNED); 620 621 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 622 623 /* 624 * stop all the transfers, if not already stopped: 625 */ 626 usb2_transfer_stop(sc->sc_xfer[CUE_BULK_DT_WR]); 627 usb2_transfer_stop(sc->sc_xfer[CUE_BULK_DT_RD]); 628 629 cue_csr_write_1(sc, CUE_ETHCTL, 0); 630 cue_reset(sc); 631} 632 633/* 634 * Stop all chip I/O so that the kernel's probe routines don't 635 * get confused by errant DMAs when rebooting. 636 */ 637static int 638cue_shutdown(device_t dev) 639{ 640 struct cue_softc *sc = device_get_softc(dev); 641 642 usb2_ether_ifshutdown(&sc->sc_ue); 643 644 return (0); 645} 646