FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/net/if_kue.c

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * 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/socket.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 <net/if.h>
    #include <net/if_var.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 | CTLFLAG_MPSAFE, 0,
       "USB kue");
   SYSCTL_INT(_hw_usb_kue, OID_AUTO, debug, CTLFLAG_RWTUN, &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),
   };
   
   DRIVER_MODULE(kue, uhub, kue_driver, NULL, NULL);
   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);
   USB_PNP_HOST_INFO(kue_devs);
   
   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 u_int
   kue_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int cnt)
   {
           struct kue_softc *sc = arg;
   
           if (cnt >= KUE_MCFILTCNT(sc))
                   return (1);
   
           memcpy(KUE_MCFILT(sc, cnt), LLADDR(sdl), ETHER_ADDR_LEN);
   
           return (1);
   }
   
   static void
   kue_setmulti(struct usb_ether *ue)
   {
           struct kue_softc *sc = uether_getsc(ue);
           struct ifnet *ifp = uether_getifp(ue);
           int i;
   
           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;
   
           i = if_foreach_llmaddr(ifp, kue_copy_maddr, sc);
   
           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 <= (int)(2 + sizeof(struct ether_header))) {
                           if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
                           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");
                   if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
   
                   /* 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));
   
                   if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
   
                   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]);
   }

Cache object: 0ad341e768b057880b3a991c0a42c2f1