/*      $OpenBSD: if_upl.c,v 1.80 2024/05/23 03:21:09 jsg Exp $ */
/*      $NetBSD: if_upl.c,v 1.19 2002/07/11 21:14:26 augustss Exp $     */
/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net) at
 * Carlstedt Research & Technology.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Prolific PL2301/PL2302 driver
 */

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>

#include <sys/device.h>

#include <net/if.h>
#include <net/if_types.h>

#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdevs.h>

/*
 * 7  6  5  4  3  2  1  0
 * tx rx 1  0
 * 1110 0000 rxdata
 * 1010 0000 idle
 * 0010 0000 tx over
 * 0110      tx over + rxd
 */

#define UPL_RXDATA              0x40
#define UPL_TXOK                0x80

#define UPL_INTR_PKTLEN         1

#define UPL_CONFIG_NO           1
#define UPL_IFACE_IDX           0

/***/

#define UPL_INTR_INTERVAL       20

#define UPL_BUFSZ               1024

#define UPL_RX_FRAMES           1
#define UPL_TX_FRAMES           1

#define UPL_RX_LIST_CNT         1
#define UPL_TX_LIST_CNT         1

#define UPL_ENDPT_RX            0x0
#define UPL_ENDPT_TX            0x1
#define UPL_ENDPT_INTR          0x2
#define UPL_ENDPT_MAX           0x3

struct upl_softc;

struct upl_chain {
        struct upl_softc        *upl_sc;
        struct usbd_xfer        *upl_xfer;
        char                    *upl_buf;
        struct mbuf             *upl_mbuf;
        int                     upl_idx;
};

struct upl_cdata {
        struct upl_chain        upl_tx_chain[UPL_TX_LIST_CNT];
        struct upl_chain        upl_rx_chain[UPL_RX_LIST_CNT];
        int                     upl_tx_prod;
        int                     upl_tx_cons;
        int                     upl_tx_cnt;
        int                     upl_rx_prod;
};

struct upl_softc {
        struct device           sc_dev;

        struct ifnet            sc_if;
        struct timeout          sc_stat_ch;

        struct usbd_device      *sc_udev;
        struct usbd_interface   *sc_iface;
        int                     sc_ed[UPL_ENDPT_MAX];
        struct usbd_pipe        *sc_ep[UPL_ENDPT_MAX];
        struct upl_cdata        sc_cdata;

        uByte                   sc_ibuf;

        u_int                   sc_rx_errs;
        struct timeval          sc_rx_notice;
        u_int                   sc_intr_errs;
};

#ifdef UPL_DEBUG
#define DPRINTF(x)      do { if (upldebug) printf x; } while (0)
#define DPRINTFN(n,x)   do { if (upldebug >= (n)) printf x; } while (0)
int     upldebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/*
 * Various supported device vendors/products.
 */
struct usb_devno upl_devs[] = {
        { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2301 },
        { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2302 }
};

int upl_match(struct device *, void *, void *);
void upl_attach(struct device *, struct device *, void *);
int upl_detach(struct device *, int);

struct cfdriver upl_cd = {
        NULL, "upl", DV_IFNET
};

const struct cfattach upl_ca = {
        sizeof(struct upl_softc), upl_match, upl_attach, upl_detach
};

int upl_openpipes(struct upl_softc *);
int upl_tx_list_init(struct upl_softc *);
int upl_rx_list_init(struct upl_softc *);
int upl_newbuf(struct upl_softc *, struct upl_chain *, struct mbuf *);
int upl_send(struct upl_softc *, struct mbuf *, int);
void upl_intr(struct usbd_xfer *, void *, usbd_status);
void upl_rxeof(struct usbd_xfer *, void *, usbd_status);
void upl_txeof(struct usbd_xfer *, void *, usbd_status);
void upl_start(struct ifnet *);
int upl_ioctl(struct ifnet *, u_long, caddr_t);
void upl_init(void *);
void upl_stop(struct upl_softc *);
void upl_watchdog(struct ifnet *);

int upl_output(struct ifnet *, struct mbuf *, struct sockaddr *,
                      struct rtentry *);

/*
 * Probe for a Prolific chip.
 */
int
upl_match(struct device *parent, void *match, void *aux)
{
        struct usb_attach_arg           *uaa = aux;

        if (uaa->iface == NULL || uaa->configno != UPL_CONFIG_NO)
                return (UMATCH_NONE);

        return (usb_lookup(upl_devs, uaa->vendor, uaa->product) != NULL ?
            UMATCH_VENDOR_PRODUCT : UMATCH_NONE);
}

void
upl_attach(struct device *parent, struct device *self, void *aux)
{
        struct upl_softc        *sc = (struct upl_softc *)self;
        struct usb_attach_arg   *uaa = aux;
        int                     s;
        struct usbd_device      *dev = uaa->device;
        struct usbd_interface   *iface;
        usbd_status             err;
        struct ifnet            *ifp;
        usb_interface_descriptor_t      *id;
        usb_endpoint_descriptor_t       *ed;
        int                     i;

        DPRINTFN(5,(" : upl_attach: sc=%p, dev=%p", sc, dev));

        sc->sc_udev = dev;

        err = usbd_device2interface_handle(dev, UPL_IFACE_IDX, &iface);
        if (err) {
                printf("%s: getting interface handle failed\n",
                    sc->sc_dev.dv_xname);
                return;
        }

        sc->sc_iface = iface;
        id = usbd_get_interface_descriptor(iface);

        /* Find endpoints. */
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(iface, i);
                if (ed == NULL) {
                        printf("%s: couldn't get ep %d\n",
                            sc->sc_dev.dv_xname, i);
                        return;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->sc_ed[UPL_ENDPT_RX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->sc_ed[UPL_ENDPT_TX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
                        sc->sc_ed[UPL_ENDPT_INTR] = ed->bEndpointAddress;
                }
        }

        if (sc->sc_ed[UPL_ENDPT_RX] == 0 || sc->sc_ed[UPL_ENDPT_TX] == 0 ||
            sc->sc_ed[UPL_ENDPT_INTR] == 0) {
                printf("%s: missing endpoint\n", sc->sc_dev.dv_xname);
                return;
        }

        s = splnet();

        /* Initialize interface info.*/
        ifp = &sc->sc_if;
        ifp->if_softc = sc;
        ifp->if_mtu = UPL_BUFSZ;
        ifp->if_hardmtu = UPL_BUFSZ;
        ifp->if_flags = IFF_POINTOPOINT | IFF_SIMPLEX;
        ifp->if_ioctl = upl_ioctl;
        ifp->if_start = upl_start;
        ifp->if_watchdog = upl_watchdog;
        strlcpy(ifp->if_xname, sc->sc_dev.dv_xname, IFNAMSIZ);

        ifp->if_type = IFT_OTHER;
        ifp->if_addrlen = 0;
        ifp->if_hdrlen = 0;
        ifp->if_output = upl_output;
        ifp->if_baudrate = IF_Mbps(12);

        /* Attach the interface. */
        if_attach(ifp);
        if_alloc_sadl(ifp);

        splx(s);
}

int
upl_detach(struct device *self, int flags)
{
        struct upl_softc        *sc = (struct upl_softc *)self;
        struct ifnet            *ifp = &sc->sc_if;
        int                     s;

        DPRINTFN(2,("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        s = splusb();

        if (ifp->if_flags & IFF_RUNNING)
                upl_stop(sc);

        if (ifp->if_softc != NULL)
                if_detach(ifp);

#ifdef DIAGNOSTIC
        if (sc->sc_ep[UPL_ENDPT_TX] != NULL ||
            sc->sc_ep[UPL_ENDPT_RX] != NULL ||
            sc->sc_ep[UPL_ENDPT_INTR] != NULL)
                printf("%s: detach has active endpoints\n",
                       sc->sc_dev.dv_xname);
#endif

        splx(s);

        return (0);
}

/*
 * Initialize an RX descriptor and attach an MBUF cluster.
 */
int
upl_newbuf(struct upl_softc *sc, struct upl_chain *c, struct mbuf *m)
{
        struct mbuf             *m_new = NULL;

        DPRINTFN(8,("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        if (m == NULL) {
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        printf("%s: no memory for rx list "
                            "-- packet dropped!\n", sc->sc_dev.dv_xname);
                        return (ENOBUFS);
                }

                MCLGET(m_new, M_DONTWAIT);
                if (!(m_new->m_flags & M_EXT)) {
                        printf("%s: no memory for rx list "
                            "-- packet dropped!\n", sc->sc_dev.dv_xname);
                        m_freem(m_new);
                        return (ENOBUFS);
                }
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
        } else {
                m_new = m;
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
                m_new->m_data = m_new->m_ext.ext_buf;
        }

        c->upl_mbuf = m_new;

        return (0);
}

int
upl_rx_list_init(struct upl_softc *sc)
{
        struct upl_cdata        *cd;
        struct upl_chain        *c;
        int                     i;

        DPRINTFN(5,("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        cd = &sc->sc_cdata;
        for (i = 0; i < UPL_RX_LIST_CNT; i++) {
                c = &cd->upl_rx_chain[i];
                c->upl_sc = sc;
                c->upl_idx = i;
                if (upl_newbuf(sc, c, NULL) == ENOBUFS)
                        return (ENOBUFS);
                if (c->upl_xfer == NULL) {
                        c->upl_xfer = usbd_alloc_xfer(sc->sc_udev);
                        if (c->upl_xfer == NULL)
                                return (ENOBUFS);
                        c->upl_buf = usbd_alloc_buffer(c->upl_xfer, UPL_BUFSZ);
                        if (c->upl_buf == NULL) {
                                usbd_free_xfer(c->upl_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

int
upl_tx_list_init(struct upl_softc *sc)
{
        struct upl_cdata        *cd;
        struct upl_chain        *c;
        int                     i;

        DPRINTFN(5,("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        cd = &sc->sc_cdata;
        for (i = 0; i < UPL_TX_LIST_CNT; i++) {
                c = &cd->upl_tx_chain[i];
                c->upl_sc = sc;
                c->upl_idx = i;
                c->upl_mbuf = NULL;
                if (c->upl_xfer == NULL) {
                        c->upl_xfer = usbd_alloc_xfer(sc->sc_udev);
                        if (c->upl_xfer == NULL)
                                return (ENOBUFS);
                        c->upl_buf = usbd_alloc_buffer(c->upl_xfer, UPL_BUFSZ);
                        if (c->upl_buf == NULL) {
                                usbd_free_xfer(c->upl_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
void
upl_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct upl_chain        *c = priv;
        struct upl_softc        *sc = c->upl_sc;
        struct ifnet            *ifp = &sc->sc_if;
        struct mbuf_list        ml = MBUF_LIST_INITIALIZER();
        struct mbuf             *m;
        int                     total_len = 0;
        int                     s;

        if (usbd_is_dying(sc->sc_udev))
                return;

        if (!(ifp->if_flags & IFF_RUNNING))
                return;

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                sc->sc_rx_errs++;
                if (usbd_ratecheck(&sc->sc_rx_notice)) {
                        printf("%s: %u usb errors on rx: %s\n",
                            sc->sc_dev.dv_xname, sc->sc_rx_errs,
                            usbd_errstr(status));
                        sc->sc_rx_errs = 0;
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->sc_ep[UPL_ENDPT_RX]);
                goto done;
        }

        usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);

        DPRINTFN(9,("%s: %s: enter status=%d length=%d\n",
                    sc->sc_dev.dv_xname, __func__, status, total_len));

        m = c->upl_mbuf;
        memcpy(mtod(c->upl_mbuf, char *), c->upl_buf, total_len);

        m->m_pkthdr.len = m->m_len = total_len;
        ml_enqueue(&ml, m);

        if (upl_newbuf(sc, c, NULL) == ENOBUFS) {
                ifp->if_ierrors++;
                goto done;
        }

        s = splnet();
        if_input(ifp, &ml);
        splx(s);
 done:
#if 1
        /* Setup new transfer. */
        usbd_setup_xfer(c->upl_xfer, sc->sc_ep[UPL_ENDPT_RX],
            c, c->upl_buf, UPL_BUFSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY,
            USBD_NO_TIMEOUT, upl_rxeof);
        usbd_transfer(c->upl_xfer);

        DPRINTFN(10,("%s: %s: start rx\n", sc->sc_dev.dv_xname,
                    __func__));
#endif
}

/*
 * A frame was downloaded to the chip. It's safe for us to clean up
 * the list buffers.
 */
void
upl_txeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct upl_chain        *c = priv;
        struct upl_softc        *sc = c->upl_sc;
        struct ifnet            *ifp = &sc->sc_if;
        int                     s;

        if (usbd_is_dying(sc->sc_udev))
                return;

        s = splnet();

        DPRINTFN(10,("%s: %s: enter status=%d\n", sc->sc_dev.dv_xname,
                    __func__, status));

        ifp->if_timer = 0;
        ifq_clr_oactive(&ifp->if_snd);

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        splx(s);
                        return;
                }
                ifp->if_oerrors++;
                printf("%s: usb error on tx: %s\n", sc->sc_dev.dv_xname,
                    usbd_errstr(status));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->sc_ep[UPL_ENDPT_TX]);
                splx(s);
                return;
        }

        m_freem(c->upl_mbuf);
        c->upl_mbuf = NULL;

        if (ifq_empty(&ifp->if_snd) == 0)
                upl_start(ifp);

        splx(s);
}

int
upl_send(struct upl_softc *sc, struct mbuf *m, int idx)
{
        int                     total_len;
        struct upl_chain        *c;
        usbd_status             err;

        c = &sc->sc_cdata.upl_tx_chain[idx];

        /*
         * Copy the mbuf data into a contiguous buffer, leaving two
         * bytes at the beginning to hold the frame length.
         */
        m_copydata(m, 0, m->m_pkthdr.len, c->upl_buf);
        c->upl_mbuf = m;

        total_len = m->m_pkthdr.len;

        DPRINTFN(10,("%s: %s: total_len=%d\n",
                     sc->sc_dev.dv_xname, __func__, total_len));

        usbd_setup_xfer(c->upl_xfer, sc->sc_ep[UPL_ENDPT_TX],
            c, c->upl_buf, total_len, USBD_NO_COPY, USBD_DEFAULT_TIMEOUT,
            upl_txeof);

        /* Transmit */
        err = usbd_transfer(c->upl_xfer);
        if (err != USBD_IN_PROGRESS) {
                printf("%s: upl_send error=%s\n", sc->sc_dev.dv_xname,
                       usbd_errstr(err));
                c->upl_mbuf = NULL;
                upl_stop(sc);
                return (EIO);
        }

        sc->sc_cdata.upl_tx_cnt++;

        return (0);
}

void
upl_start(struct ifnet *ifp)
{
        struct upl_softc        *sc = ifp->if_softc;
        struct mbuf             *m_head = NULL;

        if (usbd_is_dying(sc->sc_udev))
                return;

        DPRINTFN(10,("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        if (ifq_is_oactive(&ifp->if_snd))
                return;

        m_head = ifq_dequeue(&ifp->if_snd);
        if (m_head == NULL)
                return;

        if (upl_send(sc, m_head, 0)) {
                m_freem(m_head);
                ifq_set_oactive(&ifp->if_snd);
                return;
        }

#if NBPFILTER > 0
        /*
         * If there's a BPF listener, bounce a copy of this frame
         * to him.
         */
        if (ifp->if_bpf)
                bpf_mtap(ifp->if_bpf, m_head, BPF_DIRECTION_OUT);
#endif

        ifq_set_oactive(&ifp->if_snd);

        /*
         * Set a timeout in case the chip goes out to lunch.
         */
        ifp->if_timer = 5;
}

void
upl_init(void *xsc)
{
        struct upl_softc        *sc = xsc;
        struct ifnet            *ifp = &sc->sc_if;
        int                     s;

        if (usbd_is_dying(sc->sc_udev))
                return;

        DPRINTFN(10,("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        s = splnet();

        /* Init TX ring. */
        if (upl_tx_list_init(sc) == ENOBUFS) {
                printf("%s: tx list init failed\n", sc->sc_dev.dv_xname);
                splx(s);
                return;
        }

        /* Init RX ring. */
        if (upl_rx_list_init(sc) == ENOBUFS) {
                printf("%s: rx list init failed\n", sc->sc_dev.dv_xname);
                splx(s);
                return;
        }

        if (sc->sc_ep[UPL_ENDPT_RX] == NULL) {
                if (upl_openpipes(sc)) {
                        splx(s);
                        return;
                }
        }

        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        splx(s);
}

int
upl_openpipes(struct upl_softc *sc)
{
        struct upl_chain        *c;
        usbd_status             err;
        int                     i;

        /* Open RX and TX pipes. */
        err = usbd_open_pipe(sc->sc_iface, sc->sc_ed[UPL_ENDPT_RX],
            USBD_EXCLUSIVE_USE, &sc->sc_ep[UPL_ENDPT_RX]);
        if (err) {
                printf("%s: open rx pipe failed: %s\n",
                    sc->sc_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }
        err = usbd_open_pipe(sc->sc_iface, sc->sc_ed[UPL_ENDPT_TX],
            USBD_EXCLUSIVE_USE, &sc->sc_ep[UPL_ENDPT_TX]);
        if (err) {
                printf("%s: open tx pipe failed: %s\n",
                    sc->sc_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }
        err = usbd_open_pipe_intr(sc->sc_iface, sc->sc_ed[UPL_ENDPT_INTR],
            0, &sc->sc_ep[UPL_ENDPT_INTR], sc,
            &sc->sc_ibuf, UPL_INTR_PKTLEN, upl_intr,
            UPL_INTR_INTERVAL);
        if (err) {
                printf("%s: open intr pipe failed: %s\n",
                    sc->sc_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }


#if 1
        /* Start up the receive pipe. */
        for (i = 0; i < UPL_RX_LIST_CNT; i++) {
                c = &sc->sc_cdata.upl_rx_chain[i];
                usbd_setup_xfer(c->upl_xfer, sc->sc_ep[UPL_ENDPT_RX],
                    c, c->upl_buf, UPL_BUFSZ,
                    USBD_SHORT_XFER_OK | USBD_NO_COPY, USBD_NO_TIMEOUT,
                    upl_rxeof);
                usbd_transfer(c->upl_xfer);
        }
#endif

        return (0);
}

void
upl_intr(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct upl_softc        *sc = priv;
        struct ifnet            *ifp = &sc->sc_if;
        uByte                   stat;

        DPRINTFN(15,("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        if (usbd_is_dying(sc->sc_udev))
                return;

        if (!(ifp->if_flags & IFF_RUNNING))
                return;

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        return;
                }
                sc->sc_intr_errs++;
                if (usbd_ratecheck(&sc->sc_rx_notice)) {
                        printf("%s: %u usb errors on intr: %s\n",
                            sc->sc_dev.dv_xname, sc->sc_rx_errs,
                            usbd_errstr(status));
                        sc->sc_intr_errs = 0;
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->sc_ep[UPL_ENDPT_RX]);
                return;
        }

        stat = sc->sc_ibuf;

        if (stat == 0)
                return;

        DPRINTFN(10,("%s: %s: stat=0x%02x\n", sc->sc_dev.dv_xname,
                     __func__, stat));

}

int
upl_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
        struct upl_softc        *sc = ifp->if_softc;
        struct ifreq            *ifr = (struct ifreq *)data;
        int                     s, error = 0;

        if (usbd_is_dying(sc->sc_udev))
                return ENXIO;

        DPRINTFN(5,("%s: %s: cmd=0x%08lx\n",
                    sc->sc_dev.dv_xname, __func__, command));

        s = splnet();

        switch(command) {
        case SIOCSIFADDR:
                ifp->if_flags |= IFF_UP;
                if (!(ifp->if_flags & IFF_RUNNING))
                        upl_init(sc);
                break;

        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING)
                                error = ENETRESET;
                        else
                                upl_init(sc);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                upl_stop(sc);
                }
                break;

        case SIOCSIFMTU:
                if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > ifp->if_hardmtu)
                        error = EINVAL;
                else
                        ifp->if_mtu = ifr->ifr_mtu;
                break;

        default:
                error = ENOTTY;
        }

        if (error == ENETRESET)
                error = 0;

        splx(s);
        return (error);
}

void
upl_watchdog(struct ifnet *ifp)
{
        struct upl_softc        *sc = ifp->if_softc;

        DPRINTFN(5,("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        if (usbd_is_dying(sc->sc_udev))
                return;

        ifp->if_oerrors++;
        printf("%s: watchdog timeout\n", sc->sc_dev.dv_xname);

        upl_stop(sc);
        upl_init(sc);

        if (ifq_empty(&ifp->if_snd) == 0)
                upl_start(ifp);
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
void
upl_stop(struct upl_softc *sc)
{
        usbd_status             err;
        struct ifnet            *ifp;
        int                     i;

        DPRINTFN(10,("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        ifp = &sc->sc_if;
        ifp->if_timer = 0;
        ifp->if_flags &= ~IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        /* Stop transfers. */
        if (sc->sc_ep[UPL_ENDPT_RX] != NULL) {
                err = usbd_close_pipe(sc->sc_ep[UPL_ENDPT_RX]);
                if (err) {
                        printf("%s: close rx pipe failed: %s\n",
                        sc->sc_dev.dv_xname, usbd_errstr(err));
                }
                sc->sc_ep[UPL_ENDPT_RX] = NULL;
        }

        if (sc->sc_ep[UPL_ENDPT_TX] != NULL) {
                err = usbd_close_pipe(sc->sc_ep[UPL_ENDPT_TX]);
                if (err) {
                        printf("%s: close tx pipe failed: %s\n",
                            sc->sc_dev.dv_xname, usbd_errstr(err));
                }
                sc->sc_ep[UPL_ENDPT_TX] = NULL;
        }

        if (sc->sc_ep[UPL_ENDPT_INTR] != NULL) {
                err = usbd_close_pipe(sc->sc_ep[UPL_ENDPT_INTR]);
                if (err) {
                        printf("%s: close intr pipe failed: %s\n",
                            sc->sc_dev.dv_xname, usbd_errstr(err));
                }
                sc->sc_ep[UPL_ENDPT_INTR] = NULL;
        }

        /* Free RX resources. */
        for (i = 0; i < UPL_RX_LIST_CNT; i++) {
                if (sc->sc_cdata.upl_rx_chain[i].upl_mbuf != NULL) {
                        m_freem(sc->sc_cdata.upl_rx_chain[i].upl_mbuf);
                        sc->sc_cdata.upl_rx_chain[i].upl_mbuf = NULL;
                }
                if (sc->sc_cdata.upl_rx_chain[i].upl_xfer != NULL) {
                        usbd_free_xfer(sc->sc_cdata.upl_rx_chain[i].upl_xfer);
                        sc->sc_cdata.upl_rx_chain[i].upl_xfer = NULL;
                }
        }

        /* Free TX resources. */
        for (i = 0; i < UPL_TX_LIST_CNT; i++) {
                if (sc->sc_cdata.upl_tx_chain[i].upl_mbuf != NULL) {
                        m_freem(sc->sc_cdata.upl_tx_chain[i].upl_mbuf);
                        sc->sc_cdata.upl_tx_chain[i].upl_mbuf = NULL;
                }
                if (sc->sc_cdata.upl_tx_chain[i].upl_xfer != NULL) {
                        usbd_free_xfer(sc->sc_cdata.upl_tx_chain[i].upl_xfer);
                        sc->sc_cdata.upl_tx_chain[i].upl_xfer = NULL;
                }
        }
}

int
upl_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
           struct rtentry *rt0)
{
        return (if_enqueue(ifp, m));
}