text: /*-
   * Copyright (c) 1997, 1998, 1999, 2000
   *	Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by Bill Paul.
   * 4. Neither the name of the author nor the names of any co-contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  /*
   * Kawasaki LSI KL5KUSB101B USB to ethernet adapter driver.
   *
   * Written by Bill Paul <wpaul@ee.columbia.edu>
   * Electrical Engineering Department
   * Columbia University, New York City
   */
  
  /*
   * The KLSI USB to ethernet adapter chip contains an USB serial interface,
   * ethernet MAC and embedded microcontroller (called the QT Engine).
   * The chip must have firmware loaded into it before it will operate.
   * Packets are passed between the chip and host via bulk transfers.
   * There is an interrupt endpoint mentioned in the software spec, however
   * it's currently unused. This device is 10Mbps half-duplex only, hence
   * there is no media selection logic. The MAC supports a 128 entry
   * multicast filter, though the exact size of the filter can depend
   * on the firmware. Curiously, while the software spec describes various
   * ethernet statistics counters, my sample adapter and firmware combination
   * claims not to support any statistics counters at all.
   *
   * Note that once we load the firmware in the device, we have to be
   * careful not to load it again: if you restart your computer but
   * leave the adapter attached to the USB controller, it may remain
   * powered on and retain its firmware. In this case, we don't need
   * to load the firmware a second time.
   *
   * Special thanks to Rob Furr for providing an ADS Technologies
   * adapter for development and testing. No monkeys were harmed during
   * the development of this driver.
   */
  
  #include <sys/stdint.h>
  #include <sys/stddef.h>
  #include <sys/param.h>
  #include <sys/queue.h>
  #include <sys/types.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/bus.h>
  #include <sys/module.h>
  #include <sys/lock.h>
  #include <sys/mutex.h>
  #include <sys/condvar.h>
  #include <sys/sysctl.h>
  #include <sys/sx.h>
  #include <sys/unistd.h>
  #include <sys/callout.h>
  #include <sys/malloc.h>
  #include <sys/priv.h>
  
  #include <dev/usb/usb.h>
  #include <dev/usb/usbdi.h>
  #include <dev/usb/usbdi_util.h>
  #include "usbdevs.h"
  
  #define	USB_DEBUG_VAR kue_debug
  #include <dev/usb/usb_debug.h>
  #include <dev/usb/usb_process.h>
  
  #include <dev/usb/net/usb_ethernet.h>
  #include <dev/usb/net/if_kuereg.h>
  #include <dev/usb/net/if_kuefw.h>
  
  /*
   * Various supported device vendors/products.
   */
  static const STRUCT_USB_HOST_ID kue_devs[] = {
  #define	KUE_DEV(v,p) { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
  	KUE_DEV(3COM, 3C19250),
  	KUE_DEV(3COM, 3C460),
  	KUE_DEV(ABOCOM, URE450),
  	KUE_DEV(ADS, UBS10BT),
  	KUE_DEV(ADS, UBS10BTX),
  	KUE_DEV(AOX, USB101),
  	KUE_DEV(ASANTE, EA),
  	KUE_DEV(ATEN, DSB650C),
  	KUE_DEV(ATEN, UC10T),
  	KUE_DEV(COREGA, ETHER_USB_T),
  	KUE_DEV(DLINK, DSB650C),
  	KUE_DEV(ENTREGA, E45),
  	KUE_DEV(ENTREGA, XX1),
  	KUE_DEV(ENTREGA, XX2),
  	KUE_DEV(IODATA, USBETT),
  	KUE_DEV(JATON, EDA),
  	KUE_DEV(KINGSTON, XX1),
  	KUE_DEV(KLSI, DUH3E10BT),
  	KUE_DEV(KLSI, DUH3E10BTN),
  	KUE_DEV(LINKSYS, USB10T),
  	KUE_DEV(MOBILITY, EA),
  	KUE_DEV(NETGEAR, EA101),
  	KUE_DEV(NETGEAR, EA101X),
  	KUE_DEV(PERACOM, ENET),
  	KUE_DEV(PERACOM, ENET2),
  	KUE_DEV(PERACOM, ENET3),
  	KUE_DEV(PORTGEAR, EA8),
  	KUE_DEV(PORTGEAR, EA9),
  	KUE_DEV(PORTSMITH, EEA),
  	KUE_DEV(SHARK, PA),
  	KUE_DEV(SILICOM, GPE),
  	KUE_DEV(SILICOM, U2E),
  	KUE_DEV(SMC, 2102USB),
  #undef KUE_DEV
  };
  
  /* prototypes */
  
  static device_probe_t kue_probe;
  static device_attach_t kue_attach;
  static device_detach_t kue_detach;
  
  static usb_callback_t kue_bulk_read_callback;
  static usb_callback_t kue_bulk_write_callback;
  
  static uether_fn_t kue_attach_post;
  static uether_fn_t kue_init;
  static uether_fn_t kue_stop;
  static uether_fn_t kue_start;
  static uether_fn_t kue_setmulti;
  static uether_fn_t kue_setpromisc;
  
  static int	kue_do_request(struct kue_softc *,
  		    struct usb_device_request *, void *);
  static int	kue_setword(struct kue_softc *, uint8_t, uint16_t);
  static int	kue_ctl(struct kue_softc *, uint8_t, uint8_t, uint16_t,
  		    void *, int);
  static int	kue_load_fw(struct kue_softc *);
  static void	kue_reset(struct kue_softc *);
  
  #ifdef USB_DEBUG
  static int kue_debug = 0;
  
  static SYSCTL_NODE(_hw_usb, OID_AUTO, kue, CTLFLAG_RW, 0, "USB kue");
  SYSCTL_INT(_hw_usb_kue, OID_AUTO, debug, CTLFLAG_RW, &kue_debug, 0,
      "Debug level");
  #endif
  
  static const struct usb_config kue_config[KUE_N_TRANSFER] = {
  
  	[KUE_BULK_DT_WR] = {
  		.type = UE_BULK,
  		.endpoint = UE_ADDR_ANY,
  		.direction = UE_DIR_OUT,
  		.bufsize = (MCLBYTES + 2 + 64),
  		.flags = {.pipe_bof = 1,},
  		.callback = kue_bulk_write_callback,
  		.timeout = 10000,	/* 10 seconds */
  	},
  
  	[KUE_BULK_DT_RD] = {
  		.type = UE_BULK,
  		.endpoint = UE_ADDR_ANY,
  		.direction = UE_DIR_IN,
  		.bufsize = (MCLBYTES + 2),
  		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
  		.callback = kue_bulk_read_callback,
  		.timeout = 0,	/* no timeout */
  	},
  };
  
  static device_method_t kue_methods[] = {
  	/* Device interface */
  	DEVMETHOD(device_probe, kue_probe),
  	DEVMETHOD(device_attach, kue_attach),
  	DEVMETHOD(device_detach, kue_detach),
  
  	DEVMETHOD_END
  };
  
  static driver_t kue_driver = {
  	.name = "kue",
  	.methods = kue_methods,
  	.size = sizeof(struct kue_softc),
  };
  
  static devclass_t kue_devclass;
  
  DRIVER_MODULE(kue, uhub, kue_driver, kue_devclass, NULL, 0);
  MODULE_DEPEND(kue, uether, 1, 1, 1);
  MODULE_DEPEND(kue, usb, 1, 1, 1);
  MODULE_DEPEND(kue, ether, 1, 1, 1);
  MODULE_VERSION(kue, 1);
  
  static const struct usb_ether_methods kue_ue_methods = {
  	.ue_attach_post = kue_attach_post,
  	.ue_start = kue_start,
  	.ue_init = kue_init,
  	.ue_stop = kue_stop,
  	.ue_setmulti = kue_setmulti,
  	.ue_setpromisc = kue_setpromisc,
  };
  
  /*
   * We have a custom do_request function which is almost like the
   * regular do_request function, except it has a much longer timeout.
   * Why? Because we need to make requests over the control endpoint
   * to download the firmware to the device, which can take longer
   * than the default timeout.
   */
  static int
  kue_do_request(struct kue_softc *sc, struct usb_device_request *req,
      void *data)
  {
  	usb_error_t err;
  
  	err = uether_do_request(&sc->sc_ue, req, data, 60000);
  
  	return (err);
  }
  
  static int
  kue_setword(struct kue_softc *sc, uint8_t breq, uint16_t word)
  {
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
  	req.bRequest = breq;
  	USETW(req.wValue, word);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  
  	return (kue_do_request(sc, &req, NULL));
  }
  
  static int
  kue_ctl(struct kue_softc *sc, uint8_t rw, uint8_t breq,
      uint16_t val, void *data, int len)
  {
  	struct usb_device_request req;
  
  	if (rw == KUE_CTL_WRITE)
  		req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
  	else
  		req.bmRequestType = UT_READ_VENDOR_DEVICE;
  
  
  	req.bRequest = breq;
  	USETW(req.wValue, val);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, len);
  
  	return (kue_do_request(sc, &req, data));
  }
  
  static int
  kue_load_fw(struct kue_softc *sc)
  {
  	struct usb_device_descriptor *dd;
  	uint16_t hwrev;
  	usb_error_t err;
  
  	dd = usbd_get_device_descriptor(sc->sc_ue.ue_udev);
  	hwrev = UGETW(dd->bcdDevice);
  
  	/*
  	 * First, check if we even need to load the firmware.
  	 * If the device was still attached when the system was
  	 * rebooted, it may already have firmware loaded in it.
  	 * If this is the case, we don't need to do it again.
  	 * And in fact, if we try to load it again, we'll hang,
  	 * so we have to avoid this condition if we don't want
  	 * to look stupid.
  	 *
  	 * We can test this quickly by checking the bcdRevision
  	 * code. The NIC will return a different revision code if
  	 * it's probed while the firmware is still loaded and
  	 * running.
  	 */
  	if (hwrev == 0x0202)
  		return(0);
  
  	/* Load code segment */
  	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
  	    0, kue_code_seg, sizeof(kue_code_seg));
  	if (err) {
  		device_printf(sc->sc_ue.ue_dev, "failed to load code segment: %s\n",
  		    usbd_errstr(err));
  		return(ENXIO);
  	}
  
  	/* Load fixup segment */
  	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
  	    0, kue_fix_seg, sizeof(kue_fix_seg));
  	if (err) {
  		device_printf(sc->sc_ue.ue_dev, "failed to load fixup segment: %s\n",
  		    usbd_errstr(err));
  		return(ENXIO);
  	}
  
  	/* Send trigger command. */
  	err = kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SEND_SCAN,
  	    0, kue_trig_seg, sizeof(kue_trig_seg));
  	if (err) {
  		device_printf(sc->sc_ue.ue_dev, "failed to load trigger segment: %s\n",
  		    usbd_errstr(err));
  		return(ENXIO);
  	}
  
  	return (0);
  }
  
  static void
  kue_setpromisc(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  	struct ifnet *ifp = uether_getifp(ue);
  
  	KUE_LOCK_ASSERT(sc, MA_OWNED);
  
  	if (ifp->if_flags & IFF_PROMISC)
  		sc->sc_rxfilt |= KUE_RXFILT_PROMISC;
  	else
  		sc->sc_rxfilt &= ~KUE_RXFILT_PROMISC;
  
  	kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
  }
  
  static void
  kue_setmulti(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  	struct ifnet *ifp = uether_getifp(ue);
  	struct ifmultiaddr *ifma;
  	int i = 0;
  
  	KUE_LOCK_ASSERT(sc, MA_OWNED);
  
  	if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
  		sc->sc_rxfilt |= KUE_RXFILT_ALLMULTI;
  		sc->sc_rxfilt &= ~KUE_RXFILT_MULTICAST;
  		kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
  		return;
  	}
  
  	sc->sc_rxfilt &= ~KUE_RXFILT_ALLMULTI;
  
  	if_maddr_rlock(ifp);
  	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
  	{
  		if (ifma->ifma_addr->sa_family != AF_LINK)
  			continue;
  		/*
  		 * If there are too many addresses for the
  		 * internal filter, switch over to allmulti mode.
  		 */
  		if (i == KUE_MCFILTCNT(sc))
  			break;
  		memcpy(KUE_MCFILT(sc, i),
  		    LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
  		    ETHER_ADDR_LEN);
  		i++;
  	}
  	if_maddr_runlock(ifp);
  
  	if (i == KUE_MCFILTCNT(sc))
  		sc->sc_rxfilt |= KUE_RXFILT_ALLMULTI;
  	else {
  		sc->sc_rxfilt |= KUE_RXFILT_MULTICAST;
  		kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SET_MCAST_FILTERS,
  		    i, sc->sc_mcfilters, i * ETHER_ADDR_LEN);
  	}
  
  	kue_setword(sc, KUE_CMD_SET_PKT_FILTER, sc->sc_rxfilt);
  }
  
  /*
   * Issue a SET_CONFIGURATION command to reset the MAC. This should be
   * done after the firmware is loaded into the adapter in order to
   * bring it into proper operation.
   */
  static void
  kue_reset(struct kue_softc *sc)
  {
  	struct usb_config_descriptor *cd;
  	usb_error_t err;
  
  	cd = usbd_get_config_descriptor(sc->sc_ue.ue_udev);
  
  	err = usbd_req_set_config(sc->sc_ue.ue_udev, &sc->sc_mtx,
  	    cd->bConfigurationValue);
  	if (err)
  		DPRINTF("reset failed (ignored)\n");
  
  	/* wait a little while for the chip to get its brains in order */
  	uether_pause(&sc->sc_ue, hz / 100);
  }
  
  static void
  kue_attach_post(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  	int error;
  
  	/* load the firmware into the NIC */
  	error = kue_load_fw(sc);
  	if (error) {
  		device_printf(sc->sc_ue.ue_dev, "could not load firmware\n");
  		/* ignore the error */
  	}
  
  	/* reset the adapter */
  	kue_reset(sc);
  
  	/* read ethernet descriptor */
  	kue_ctl(sc, KUE_CTL_READ, KUE_CMD_GET_ETHER_DESCRIPTOR,
  	    0, &sc->sc_desc, sizeof(sc->sc_desc));
  
  	/* copy in ethernet address */
  	memcpy(ue->ue_eaddr, sc->sc_desc.kue_macaddr, sizeof(ue->ue_eaddr));
  }
  
  /*
   * Probe for a KLSI chip.
   */
  static int
  kue_probe(device_t dev)
  {
  	struct usb_attach_arg *uaa = device_get_ivars(dev);
  
  	if (uaa->usb_mode != USB_MODE_HOST)
  		return (ENXIO);
  	if (uaa->info.bConfigIndex != KUE_CONFIG_IDX)
  		return (ENXIO);
  	if (uaa->info.bIfaceIndex != KUE_IFACE_IDX)
  		return (ENXIO);
  
  	return (usbd_lookup_id_by_uaa(kue_devs, sizeof(kue_devs), uaa));
  }
  
  /*
   * Attach the interface. Allocate softc structures, do
   * setup and ethernet/BPF attach.
   */
  static int
  kue_attach(device_t dev)
  {
  	struct usb_attach_arg *uaa = device_get_ivars(dev);
  	struct kue_softc *sc = device_get_softc(dev);
  	struct usb_ether *ue = &sc->sc_ue;
  	uint8_t iface_index;
  	int error;
  
  	device_set_usb_desc(dev);
  	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
  
  	iface_index = KUE_IFACE_IDX;
  	error = usbd_transfer_setup(uaa->device, &iface_index,
  	    sc->sc_xfer, kue_config, KUE_N_TRANSFER, sc, &sc->sc_mtx);
  	if (error) {
  		device_printf(dev, "allocating USB transfers failed\n");
  		goto detach;
  	}
  
  	sc->sc_mcfilters = malloc(KUE_MCFILTCNT(sc) * ETHER_ADDR_LEN,
  	    M_USBDEV, M_WAITOK);
  	if (sc->sc_mcfilters == NULL) {
  		device_printf(dev, "failed allocating USB memory\n");
  		goto detach;
  	}
  
  	ue->ue_sc = sc;
  	ue->ue_dev = dev;
  	ue->ue_udev = uaa->device;
  	ue->ue_mtx = &sc->sc_mtx;
  	ue->ue_methods = &kue_ue_methods;
  
  	error = uether_ifattach(ue);
  	if (error) {
  		device_printf(dev, "could not attach interface\n");
  		goto detach;
  	}
  	return (0);			/* success */
  
  detach:
  	kue_detach(dev);
  	return (ENXIO);			/* failure */
  }
  
  static int
  kue_detach(device_t dev)
  {
  	struct kue_softc *sc = device_get_softc(dev);
  	struct usb_ether *ue = &sc->sc_ue;
  
  	usbd_transfer_unsetup(sc->sc_xfer, KUE_N_TRANSFER);
  	uether_ifdetach(ue);
  	mtx_destroy(&sc->sc_mtx);
  	free(sc->sc_mcfilters, M_USBDEV);
  
  	return (0);
  }
  
  /*
   * A frame has been uploaded: pass the resulting mbuf chain up to
   * the higher level protocols.
   */
  static void
  kue_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
  {
  	struct kue_softc *sc = usbd_xfer_softc(xfer);
  	struct usb_ether *ue = &sc->sc_ue;
  	struct ifnet *ifp = uether_getifp(ue);
  	struct usb_page_cache *pc;
  	uint8_t buf[2];
  	int len;
  	int actlen;
  
  	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
  
  	switch (USB_GET_STATE(xfer)) {
  	case USB_ST_TRANSFERRED:
  
  		if (actlen <= (2 + sizeof(struct ether_header))) {
  			ifp->if_ierrors++;
  			goto tr_setup;
  		}
  		pc = usbd_xfer_get_frame(xfer, 0);
  		usbd_copy_out(pc, 0, buf, 2);
  		actlen -= 2;
  		len = buf[0] | (buf[1] << 8);
  		len = min(actlen, len);
  
  		uether_rxbuf(ue, pc, 2, len);
  		/* FALLTHROUGH */
  	case USB_ST_SETUP:
  tr_setup:
  		usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
  		usbd_transfer_submit(xfer);
  		uether_rxflush(ue);
  		return;
  
  	default:			/* Error */
  		DPRINTF("bulk read error, %s\n",
  		    usbd_errstr(error));
  
  		if (error != USB_ERR_CANCELLED) {
  			/* try to clear stall first */
  			usbd_xfer_set_stall(xfer);
  			goto tr_setup;
  		}
  		return;
  
  	}
  }
  
  static void
  kue_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
  {
  	struct kue_softc *sc = usbd_xfer_softc(xfer);
  	struct ifnet *ifp = uether_getifp(&sc->sc_ue);
  	struct usb_page_cache *pc;
  	struct mbuf *m;
  	int total_len;
  	int temp_len;
  	uint8_t buf[2];
  
  	switch (USB_GET_STATE(xfer)) {
  	case USB_ST_TRANSFERRED:
  		DPRINTFN(11, "transfer complete\n");
  		ifp->if_opackets++;
  
  		/* FALLTHROUGH */
  	case USB_ST_SETUP:
  tr_setup:
  		IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  
  		if (m == NULL)
  			return;
  		if (m->m_pkthdr.len > MCLBYTES)
  			m->m_pkthdr.len = MCLBYTES;
  		temp_len = (m->m_pkthdr.len + 2);
  		total_len = (temp_len + (64 - (temp_len % 64)));
  
  		/* the first two bytes are the frame length */
  
  		buf[0] = (uint8_t)(m->m_pkthdr.len);
  		buf[1] = (uint8_t)(m->m_pkthdr.len >> 8);
  
  		pc = usbd_xfer_get_frame(xfer, 0);
  		usbd_copy_in(pc, 0, buf, 2);
  		usbd_m_copy_in(pc, 2, m, 0, m->m_pkthdr.len);
  
  		usbd_frame_zero(pc, temp_len, total_len - temp_len);
  		usbd_xfer_set_frame_len(xfer, 0, total_len);
  
  		/*
  		 * if there's a BPF listener, bounce a copy
  		 * of this frame to him:
  		 */
  		BPF_MTAP(ifp, m);
  
  		m_freem(m);
  
  		usbd_transfer_submit(xfer);
  
  		return;
  
  	default:			/* Error */
  		DPRINTFN(11, "transfer error, %s\n",
  		    usbd_errstr(error));
  
  		ifp->if_oerrors++;
  
  		if (error != USB_ERR_CANCELLED) {
  			/* try to clear stall first */
  			usbd_xfer_set_stall(xfer);
  			goto tr_setup;
  		}
  		return;
  
  	}
  }
  
  static void
  kue_start(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  
  	/*
  	 * start the USB transfers, if not already started:
  	 */
  	usbd_transfer_start(sc->sc_xfer[KUE_BULK_DT_RD]);
  	usbd_transfer_start(sc->sc_xfer[KUE_BULK_DT_WR]);
  }
  
  static void
  kue_init(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  	struct ifnet *ifp = uether_getifp(ue);
  
  	KUE_LOCK_ASSERT(sc, MA_OWNED);
  
  	/* set MAC address */
  	kue_ctl(sc, KUE_CTL_WRITE, KUE_CMD_SET_MAC,
  	    0, IF_LLADDR(ifp), ETHER_ADDR_LEN);
  
  	/* I'm not sure how to tune these. */
  #if 0
  	/*
  	 * Leave this one alone for now; setting it
  	 * wrong causes lockups on some machines/controllers.
  	 */
  	kue_setword(sc, KUE_CMD_SET_SOFS, 1);
  #endif
  	kue_setword(sc, KUE_CMD_SET_URB_SIZE, 64);
  
  	/* load the multicast filter */
  	kue_setpromisc(ue);
  
  	usbd_xfer_set_stall(sc->sc_xfer[KUE_BULK_DT_WR]);
  
  	ifp->if_drv_flags |= IFF_DRV_RUNNING;
  	kue_start(ue);
  }
  
  static void
  kue_stop(struct usb_ether *ue)
  {
  	struct kue_softc *sc = uether_getsc(ue);
  	struct ifnet *ifp = uether_getifp(ue);
  
  	KUE_LOCK_ASSERT(sc, MA_OWNED);
  
  	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  
  	/*
  	 * stop all the transfers, if not already stopped:
  	 */
  	usbd_transfer_stop(sc->sc_xfer[KUE_BULK_DT_WR]);
  	usbd_transfer_stop(sc->sc_xfer[KUE_BULK_DT_RD]);
  }
  