/*      $OpenBSD: if_axen.c,v 1.34 2024/10/07 07:35:40 kevlo Exp $      */

/*
 * Copyright (c) 2013 Yojiro UO <yuo@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * ASIX Electronics AX88178a/AX88772d USB 2.0 ethernet and 
 * AX88179/AX88179a USB 3.0 Ethernet driver.
 */

#include "bpfilter.h"

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

#include <sys/device.h>

#include <machine/bus.h>

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

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

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

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

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

#include <dev/usb/if_axenreg.h>

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

#define AXEN_TOE        /* enable checksum offload function */

/*
 * Various supported device vendors/products.
 */
const struct axen_type axen_devs[] = {
#if 0 /* not tested */
        { { USB_VENDOR_ASIX, USB_PRODUCT_ASIX_AX88178A}, AX178A },
#endif
        { { USB_VENDOR_ASIX, USB_PRODUCT_ASIX_AX88179}, AX179 },
        { { USB_VENDOR_DLINK, USB_PRODUCT_DLINK_DUB1312}, AX179 },
        { { USB_VENDOR_LENOVO, USB_PRODUCT_LENOVO_AX88179}, AX179 },
        { { USB_VENDOR_SAMSUNG2, USB_PRODUCT_SAMSUNG2_AX88179}, AX179 },
        { { USB_VENDOR_SITECOMEU, USB_PRODUCT_SITECOMEU_LN032}, AX179 }
};

#define axen_lookup(v, p) ((struct axen_type *)usb_lookup(axen_devs, v, p))

int     axen_match(struct device *, void *, void *);
void    axen_attach(struct device *, struct device *, void *);
int     axen_detach(struct device *, int);

struct cfdriver axen_cd = {
        NULL, "axen", DV_IFNET
};

const struct cfattach axen_ca = {
        sizeof(struct axen_softc), axen_match, axen_attach, axen_detach
};

int     axen_tx_list_init(struct axen_softc *);
int     axen_rx_list_init(struct axen_softc *);
struct mbuf *axen_newbuf(void);
int     axen_encap(struct axen_softc *, struct mbuf *, int);
void    axen_rxeof(struct usbd_xfer *, void *, usbd_status);
void    axen_txeof(struct usbd_xfer *, void *, usbd_status);
void    axen_tick(void *);
void    axen_tick_task(void *);
void    axen_start(struct ifnet *);
int     axen_ioctl(struct ifnet *, u_long, caddr_t);
void    axen_init(void *);
void    axen_stop(struct axen_softc *);
void    axen_watchdog(struct ifnet *);
int     axen_miibus_readreg(struct device *, int, int);
void    axen_miibus_writereg(struct device *, int, int, int);
void    axen_miibus_statchg(struct device *);
int     axen_cmd(struct axen_softc *, int, int, int, void *);
int     axen_ifmedia_upd(struct ifnet *);
void    axen_ifmedia_sts(struct ifnet *, struct ifmediareq *);
void    axen_reset(struct axen_softc *sc);
void    axen_iff(struct axen_softc *);
void    axen_lock_mii(struct axen_softc *sc);
void    axen_unlock_mii(struct axen_softc *sc);

void    axen_ax88179_init(struct axen_softc *);

/* Get exclusive access to the MII registers */
void
axen_lock_mii(struct axen_softc *sc)
{
        sc->axen_refcnt++;
        rw_enter_write(&sc->axen_mii_lock);
}

void
axen_unlock_mii(struct axen_softc *sc)
{
        rw_exit_write(&sc->axen_mii_lock);
        if (--sc->axen_refcnt < 0)
                usb_detach_wakeup(&sc->axen_dev);
}

int
axen_cmd(struct axen_softc *sc, int cmd, int index, int val, void *buf)
{
        usb_device_request_t    req;
        usbd_status             err;

        if (usbd_is_dying(sc->axen_udev))
                return 0;

        if (AXEN_CMD_DIR(cmd))
                req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        else
                req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = AXEN_CMD_CMD(cmd);
        USETW(req.wValue, val);
        USETW(req.wIndex, index);
        USETW(req.wLength, AXEN_CMD_LEN(cmd));

        err = usbd_do_request(sc->axen_udev, &req, buf);
        DPRINTFN(5, ("axen_cmd: cmd 0x%04x val 0x%04x len %d\n",
            cmd, val, AXEN_CMD_LEN(cmd)));

        if (err) {
                DPRINTF(("axen_cmd err: cmd: %d, error: %d\n", cmd, err));
                return -1;
        }

        return 0;
}

int
axen_miibus_readreg(struct device *dev, int phy, int reg)
{
        struct axen_softc       *sc = (void *)dev;
        int                     err;
        uWord                   val;
        int                     ival;

        if (usbd_is_dying(sc->axen_udev)) {
                DPRINTF(("axen: dying\n"));
                return 0;
        }

        if (sc->axen_phyno != phy)
                return 0;

        axen_lock_mii(sc);
        err = axen_cmd(sc, AXEN_CMD_MII_READ_REG, reg, phy, &val);
        axen_unlock_mii(sc);

        if (err) {
                printf("axen%d: read PHY failed\n", sc->axen_unit);
                return -1;
        }

        ival = UGETW(val);
        DPRINTFN(2,("axen_miibus_readreg: phy 0x%x reg 0x%x val 0x%x\n",
            phy, reg, ival));

        if (reg == MII_BMSR) {
                ival &= ~BMSR_EXTCAP;
        }

        return ival;
}

void
axen_miibus_writereg(struct device *dev, int phy, int reg, int val)
{
        struct axen_softc       *sc = (void *)dev;
        int                     err;
        uWord                   uval;

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

        if (sc->axen_phyno != phy)
                return;

        USETW(uval, val);
        axen_lock_mii(sc);
        err = axen_cmd(sc, AXEN_CMD_MII_WRITE_REG, reg, phy, &uval);
        axen_unlock_mii(sc);
        DPRINTFN(2, ("axen_miibus_writereg: phy 0x%x reg 0x%x val 0x%0x\n",
            phy, reg, val));

        if (err) {
                printf("axen%d: write PHY failed\n", sc->axen_unit);
                return;
        }
}

void
axen_miibus_statchg(struct device *dev)
{
        struct axen_softc       *sc = (void *)dev;
        struct mii_data         *mii = GET_MII(sc);
        struct ifnet            *ifp;
        int                     err;
        uint16_t                val;
        uWord                   wval;

        ifp = GET_IFP(sc);
        if (mii == NULL || ifp == NULL ||
            (ifp->if_flags & IFF_RUNNING) == 0)
                return;

        sc->axen_link = 0;
        if ((mii->mii_media_status & (IFM_ACTIVE | IFM_AVALID)) ==
            (IFM_ACTIVE | IFM_AVALID)) {
                switch (IFM_SUBTYPE(mii->mii_media_active)) {
                    case IFM_10_T:
                    case IFM_100_TX:
                        sc->axen_link++;
                        break;
                    case IFM_1000_T:
                        if ((sc->axen_flags & AX772D) != 0)
                                break;
                        sc->axen_link++;
                        break;
                    default:
                        break;
                }
        }

        /* Lost link, do nothing. */
        if (sc->axen_link == 0)
                return;

        val = 0;
        if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0)
                val |= AXEN_MEDIUM_FDX;

        val |= (AXEN_MEDIUM_RECV_EN | AXEN_MEDIUM_ALWAYS_ONE);
        val |= (AXEN_MEDIUM_RXFLOW_CTRL_EN | AXEN_MEDIUM_TXFLOW_CTRL_EN);

        switch (IFM_SUBTYPE(mii->mii_media_active)) {
        case IFM_1000_T:
                val |= AXEN_MEDIUM_GIGA | AXEN_MEDIUM_EN_125MHZ;
                break;
        case IFM_100_TX:
                val |= AXEN_MEDIUM_PS;
                break;
        case IFM_10_T:
                /* doesn't need to be handled */
                break;
        }

        DPRINTF(("axen_miibus_statchg: val=0x%x\n", val));
        USETW(wval, val);
        axen_lock_mii(sc);
        err = axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MEDIUM_STATUS, &wval);
        axen_unlock_mii(sc);
        if (err) {
                printf("%s: media change failed\n", sc->axen_dev.dv_xname);
                return;
        }
}

/*
 * Set media options.
 */
int
axen_ifmedia_upd(struct ifnet *ifp)
{
        struct axen_softc       *sc = ifp->if_softc;
        struct mii_data         *mii = GET_MII(sc);
        int err;

        sc->axen_link = 0;

        if (mii->mii_instance) {
                struct mii_softc        *miisc;
                LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
                        mii_phy_reset(miisc);
        }

        err = mii_mediachg(mii);
        if (err == ENXIO)
                return 0;
        else
                return err;
}

/*
 * Report current media status.
 */
void
axen_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
        struct axen_softc       *sc = ifp->if_softc;
        struct mii_data         *mii = GET_MII(sc);

        mii_pollstat(mii);
        ifmr->ifm_active = mii->mii_media_active;
        ifmr->ifm_status = mii->mii_media_status;
}

void
axen_iff(struct axen_softc *sc)
{
        struct ifnet            *ifp = GET_IFP(sc);
        struct arpcom           *ac = &sc->arpcom;
        struct ether_multi      *enm;
        struct ether_multistep  step;
        u_int32_t               h = 0;
        u_int16_t               rxmode;
        u_int8_t                hashtbl[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
        uWord                   wval;

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

        rxmode = 0;

        /* Enable receiver, set RX mode */
        axen_lock_mii(sc);
        axen_cmd(sc, AXEN_CMD_MAC_READ2, 2, AXEN_MAC_RXCTL, &wval);
        rxmode = UGETW(wval);
        rxmode &= ~(AXEN_RXCTL_ACPT_ALL_MCAST | AXEN_RXCTL_ACPT_PHY_MCAST |
                  AXEN_RXCTL_PROMISC);
        ifp->if_flags &= ~IFF_ALLMULTI;

        /*
         * Always accept broadcast frames.
         * Always accept frames destined to our station address.
         */
        rxmode |= AXEN_RXCTL_ACPT_BCAST;

        if (ifp->if_flags & IFF_PROMISC || ac->ac_multirangecnt > 0) {
                ifp->if_flags |= IFF_ALLMULTI;
                rxmode |= AXEN_RXCTL_ACPT_ALL_MCAST | AXEN_RXCTL_ACPT_PHY_MCAST;
                if (ifp->if_flags & IFF_PROMISC)
                        rxmode |= AXEN_RXCTL_PROMISC;
        } else {
                rxmode |= AXEN_RXCTL_ACPT_ALL_MCAST | AXEN_RXCTL_ACPT_PHY_MCAST;

                /* now program new ones */
                ETHER_FIRST_MULTI(step, ac, enm);
                while (enm != NULL) {
                        h = ether_crc32_be(enm->enm_addrlo,
                            ETHER_ADDR_LEN) >> 26;
                        hashtbl[h / 8] |= 1 << (h % 8);
                        ETHER_NEXT_MULTI(step, enm);
                }
        }

        axen_cmd(sc, AXEN_CMD_MAC_WRITE_FILTER, 8, AXEN_FILTER_MULTI, 
            (void *)&hashtbl);
        USETW(wval, rxmode);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MAC_RXCTL, &wval);
        axen_unlock_mii(sc);
}

void
axen_reset(struct axen_softc *sc)
{
        if (usbd_is_dying(sc->axen_udev))
                return;
        
        axen_ax88179_init(sc);

        /* Wait a little while for the chip to get its brains in order. */
        DELAY(1000);
        return;
}

void
axen_ax88179_init(struct axen_softc *sc)
{
        uWord           wval;
        uByte           val;
        u_int16_t       ctl, temp;
        struct axen_qctrl qctrl;

        axen_lock_mii(sc);

        /* XXX: ? */
        axen_cmd(sc, AXEN_CMD_MAC_READ, 1, AXEN_UNK_05, &val);
        DPRINTFN(5, ("AXEN_CMD_MAC_READ(0x05): 0x%02x\n", val));

        /* check AX88179 version, UA1 / UA2 */
        axen_cmd(sc, AXEN_CMD_MAC_READ, 1, AXEN_GENERAL_STATUS, &val);
        /* UA1 */
        if (!(val & AXEN_GENERAL_STATUS_MASK)) {
                sc->axen_rev = AXEN_REV_UA1;
                DPRINTF(("AX88179 ver. UA1\n"));
        } else {
                sc->axen_rev = AXEN_REV_UA2;
                DPRINTF(("AX88179 ver. UA2\n"));
        }

        /* power up ethernet PHY */
        USETW(wval, 0);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_PHYPWR_RSTCTL, &wval);

        USETW(wval, AXEN_PHYPWR_RSTCTL_IPRL);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_PHYPWR_RSTCTL, &wval);
        usbd_delay_ms(sc->axen_udev, 200);

        /* set clock mode */
        val = AXEN_PHYCLK_ACS | AXEN_PHYCLK_BCS;
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_PHYCLK, &val);
        usbd_delay_ms(sc->axen_udev, 100);

        /* set monitor mode (disable) */
        val = AXEN_MONITOR_NONE;
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_MONITOR_MODE, &val);

        /* enable auto detach */
        axen_cmd(sc, AXEN_CMD_EEPROM_READ, 2, AXEN_EEPROM_STAT, &wval);
        temp = UGETW(wval);
        DPRINTFN(2,("EEPROM0x43 = 0x%04x\n", temp));
        if (!(temp == 0xffff) && !(temp & 0x0100)) {
                /* Enable auto detach bit */
                val = 0;
                axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_PHYCLK, &val);
                val = AXEN_PHYCLK_ULR;
                axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_PHYCLK, &val);
                usbd_delay_ms(sc->axen_udev, 100);

                axen_cmd(sc, AXEN_CMD_MAC_READ2, 2, AXEN_PHYPWR_RSTCTL, &wval);
                ctl = UGETW(wval);
                ctl |= AXEN_PHYPWR_RSTCTL_AUTODETACH;
                USETW(wval, ctl);
                axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_PHYPWR_RSTCTL, &wval);
                usbd_delay_ms(sc->axen_udev, 200);
                printf("%s: enable auto detach (0x%04x)\n",
                    sc->axen_dev.dv_xname, ctl);
        }

        /* bulkin queue setting */
        axen_cmd(sc, AXEN_CMD_MAC_READ, 1, AXEN_USB_UPLINK, &val);
        switch (val) {
        case AXEN_USB_FS:
                DPRINTF(("uplink: USB1.1\n"));
                qctrl.ctrl      = 0x07;
                qctrl.timer_low = 0xcc;
                qctrl.timer_high= 0x4c;
                qctrl.bufsize   = AXEN_BUFSZ_LS - 1;
                qctrl.ifg       = 0x08;
                break;
        case AXEN_USB_HS:
                DPRINTF(("uplink: USB2.0\n"));
                qctrl.ctrl      = 0x07;
                qctrl.timer_low = 0x02;
                qctrl.timer_high= 0xa0;
                qctrl.bufsize   = AXEN_BUFSZ_HS - 1;
                qctrl.ifg       = 0xff;
                break;
        case AXEN_USB_SS:
                DPRINTF(("uplink: USB3.0\n"));
                qctrl.ctrl      = 0x07;
                qctrl.timer_low = 0x4f;
                qctrl.timer_high= 0x00;
                qctrl.bufsize   = AXEN_BUFSZ_SS - 1;
                qctrl.ifg       = 0xff;
                break;
        default:
                printf("%s: unknown uplink bus:0x%02x\n",
                    sc->axen_dev.dv_xname, val);
                axen_unlock_mii(sc);
                return;
        }
        axen_cmd(sc, AXEN_CMD_MAC_SET_RXSR, 5, AXEN_RX_BULKIN_QCTRL, &qctrl);

        /* Set MAC address. */
        axen_cmd(sc, AXEN_CMD_MAC_WRITE_ETHER, ETHER_ADDR_LEN,
            AXEN_CMD_MAC_NODE_ID, &sc->arpcom.ac_enaddr);

        /*
         * set buffer high/low watermark to pause/resume.
         * write 2byte will set high/log simultaneous with AXEN_PAUSE_HIGH.
         * XXX: what is the best value? OSX driver uses 0x3c-0x4c as LOW-HIGH
         * watermark parameters.
         */
        val = 0x34;
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_PAUSE_LOW_WATERMARK, &val);
        val = 0x52;
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_PAUSE_HIGH_WATERMARK, &val);

        /* Set RX/TX configuration. */
        /* Offloading enable */
#ifdef AXEN_TOE
        val = AXEN_RXCOE_IPv4 | AXEN_RXCOE_TCPv4 | AXEN_RXCOE_UDPv4 |
              AXEN_RXCOE_TCPv6 | AXEN_RXCOE_UDPv6;
#else
        val = AXEN_RXCOE_OFF;
#endif
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_RX_COE, &val);

#ifdef AXEN_TOE
        val = AXEN_TXCOE_IPv4 | AXEN_TXCOE_TCPv4 | AXEN_TXCOE_UDPv4 |
              AXEN_TXCOE_TCPv6 | AXEN_TXCOE_UDPv6;
#else
        val = AXEN_TXCOE_OFF;
#endif
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_TX_COE, &val);

        /* Set RX control register */
        ctl = AXEN_RXCTL_IPE | AXEN_RXCTL_DROPCRCERR | AXEN_RXCTL_AUTOB;
        ctl |= AXEN_RXCTL_ACPT_PHY_MCAST | AXEN_RXCTL_ACPT_ALL_MCAST;
        ctl |= AXEN_RXCTL_START;
        USETW(wval, ctl);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MAC_RXCTL, &wval);

        /* set monitor mode (enable) */
        val = AXEN_MONITOR_PMETYPE | AXEN_MONITOR_PMEPOL | AXEN_MONITOR_RWMP;
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_MONITOR_MODE, &val);
        axen_cmd(sc, AXEN_CMD_MAC_READ, 1, AXEN_MONITOR_MODE, &val);
        DPRINTF(("axen: Monitor mode = 0x%02x\n", val));

        /* set medium type */
        ctl = AXEN_MEDIUM_GIGA | AXEN_MEDIUM_FDX | AXEN_MEDIUM_ALWAYS_ONE |
              AXEN_MEDIUM_RXFLOW_CTRL_EN | AXEN_MEDIUM_TXFLOW_CTRL_EN;
        ctl |= AXEN_MEDIUM_RECV_EN;
        USETW(wval, ctl);
        DPRINTF(("axen: set to medium mode: 0x%04x\n", UGETW(wval)));
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MEDIUM_STATUS, &wval);
        usbd_delay_ms(sc->axen_udev, 100);

        axen_cmd(sc, AXEN_CMD_MAC_READ2, 2, AXEN_MEDIUM_STATUS, &wval);
        DPRINTF(("axen: current medium mode: 0x%04x\n", UGETW(wval)));
        axen_unlock_mii(sc);

#if 0 /* XXX: TBD.... */
#define GMII_LED_ACTIVE         0x1a
#define GMII_PHY_PAGE_SEL       0x1e
#define GMII_PHY_PAGE_SEL       0x1f
#define GMII_PAGE_EXT           0x0007
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, GMII_PHY_PAGE_SEL,
            GMII_PAGE_EXT);
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, GMII_PHY_PAGE,
            0x002c);
#endif

#if 1 /* XXX: phy hack ? */
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, 0x1F, 0x0005);
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, 0x0C, 0x0000);
        val = axen_miibus_readreg(&sc->axen_dev, sc->axen_phyno, 0x0001);
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, 0x01,
            val | 0x0080);
        axen_miibus_writereg(&sc->axen_dev, sc->axen_phyno, 0x1F, 0x0000);
#endif
}

int
axen_match(struct device *parent, void *match, void *aux)
{
        struct usb_attach_arg *uaa = aux;

        if (uaa->iface == NULL || uaa->configno != 1)
                return (UMATCH_NONE);

        return (axen_lookup(uaa->vendor, uaa->product) != NULL ?
                UMATCH_VENDOR_PRODUCT_CONF_IFACE : UMATCH_NONE);
}

void
axen_attach(struct device *parent, struct device *self, void *aux)
{
        struct axen_softc       *sc = (struct axen_softc *)self;
        struct usb_attach_arg   *uaa = aux;
        usb_interface_descriptor_t *id;
        usb_endpoint_descriptor_t *ed;
        usb_device_descriptor_t *dd;
        struct mii_data         *mii;
        u_char                   eaddr[ETHER_ADDR_LEN];
        char                    *devname = sc->axen_dev.dv_xname;
        struct ifnet            *ifp;
        int                      i, s;

        sc->axen_unit = self->dv_unit; /*device_get_unit(self);*/
        sc->axen_udev = uaa->device;
        sc->axen_iface = uaa->iface;
        sc->axen_flags = axen_lookup(uaa->vendor, uaa->product)->axen_flags;

        usb_init_task(&sc->axen_tick_task, axen_tick_task, sc,
            USB_TASK_TYPE_GENERIC);
        rw_init(&sc->axen_mii_lock, "axenmii");
        usb_init_task(&sc->axen_stop_task, (void (*)(void *))axen_stop, sc,
            USB_TASK_TYPE_GENERIC);

        sc->axen_product = uaa->product;
        sc->axen_vendor = uaa->vendor;

        id = usbd_get_interface_descriptor(sc->axen_iface);

        /* decide on what our bufsize will be */
        switch (sc->axen_udev->speed) {
        case USB_SPEED_FULL:
                sc->axen_bufsz = AXEN_BUFSZ_LS * 1024; 
                break;
        case USB_SPEED_HIGH:
                sc->axen_bufsz = AXEN_BUFSZ_HS * 1024; 
                break;
        case USB_SPEED_SUPER:
                sc->axen_bufsz = AXEN_BUFSZ_SS * 1024; 
                break;
        default:
                printf("%s: not supported usb bus type", sc->axen_dev.dv_xname);
                return;
        }
                
        /* Find endpoints. */
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->axen_iface, i);
                if (!ed) {
                        printf("%s: couldn't get ep %d\n",
                            sc->axen_dev.dv_xname, i);
                        return;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->axen_ed[AXEN_ENDPT_RX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->axen_ed[AXEN_ENDPT_TX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
                        sc->axen_ed[AXEN_ENDPT_INTR] = ed->bEndpointAddress;
                }
        }

        dd = usbd_get_device_descriptor(sc->axen_udev);
        switch (UGETW(dd->bcdDevice)) {
        case 0x200:
                sc->axen_flags = AX179A;
                break;
        case 0x300:
                sc->axen_flags = AX772D;
                break;
        }

        s = splnet();

        sc->axen_phyno = AXEN_PHY_ID;
        DPRINTF((" get_phyno %d\n", sc->axen_phyno));

        /*
         * Get station address.
         */
        /* use MAC command */
        axen_lock_mii(sc);
        axen_cmd(sc, AXEN_CMD_MAC_READ_ETHER, ETHER_ADDR_LEN,
            AXEN_CMD_MAC_NODE_ID, &eaddr);
        axen_unlock_mii(sc);

        /*
         * An ASIX chip was detected. Inform the world.
         */
        printf("%s:", sc->axen_dev.dv_xname);
        if (sc->axen_flags & AX178A)
                printf(" AX88178a");
        else if (sc->axen_flags & AX179)
                printf(" AX88179");
        else if (sc->axen_flags & AX772D)
                printf(" AX88772D");
        else
                printf(" AX88179A");
        printf(", address %s\n", ether_sprintf(eaddr));

        bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);

        axen_ax88179_init(sc);

        /* Initialize interface info. */
        ifp = &sc->arpcom.ac_if;
        ifp->if_softc = sc;
        strlcpy(ifp->if_xname, devname, IFNAMSIZ);
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_ioctl = axen_ioctl;
        ifp->if_start = axen_start;
        ifp->if_watchdog = axen_watchdog;

        ifp->if_capabilities = IFCAP_VLAN_MTU;
#ifdef AXEN_TOE
        ifp->if_capabilities |= IFCAP_CSUM_IPv4 | IFCAP_CSUM_TCPv4 |
            IFCAP_CSUM_UDPv4 | IFCAP_CSUM_TCPv6 | IFCAP_CSUM_UDPv6;
#endif

        /* Initialize MII/media info. */
        mii = &sc->axen_mii;
        mii->mii_ifp = ifp;
        mii->mii_readreg = axen_miibus_readreg;
        mii->mii_writereg = axen_miibus_writereg;
        mii->mii_statchg = axen_miibus_statchg;
        mii->mii_flags = MIIF_AUTOTSLEEP;

        ifmedia_init(&mii->mii_media, 0, axen_ifmedia_upd, axen_ifmedia_sts);
        mii_attach(self, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY, 0);

        if (LIST_FIRST(&mii->mii_phys) == NULL) {
                ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_NONE);
        } else
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_AUTO);

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

        timeout_set(&sc->axen_stat_ch, axen_tick, sc);

        splx(s);
}

int
axen_detach(struct device *self, int flags)
{
        struct axen_softc       *sc = (struct axen_softc *)self;
        int                     s;
        struct ifnet            *ifp = GET_IFP(sc);

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

        if (timeout_initialized(&sc->axen_stat_ch))
                timeout_del(&sc->axen_stat_ch);

        if (sc->axen_ep[AXEN_ENDPT_TX] != NULL)
                usbd_abort_pipe(sc->axen_ep[AXEN_ENDPT_TX]);
        if (sc->axen_ep[AXEN_ENDPT_RX] != NULL)
                usbd_abort_pipe(sc->axen_ep[AXEN_ENDPT_RX]);
        if (sc->axen_ep[AXEN_ENDPT_INTR] != NULL)
                usbd_abort_pipe(sc->axen_ep[AXEN_ENDPT_INTR]);

        /*
         * Remove any pending tasks.  They cannot be executing because they run
         * in the same thread as detach.
         */
        usb_rem_task(sc->axen_udev, &sc->axen_tick_task);
        usb_rem_task(sc->axen_udev, &sc->axen_stop_task);

        s = splusb();

        if (--sc->axen_refcnt >= 0) {
                /* Wait for processes to go away */
                usb_detach_wait(&sc->axen_dev);
        }

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

        mii_detach(&sc->axen_mii, MII_PHY_ANY, MII_OFFSET_ANY);
        ifmedia_delete_instance(&sc->axen_mii.mii_media, IFM_INST_ANY);
        if (ifp->if_softc != NULL) {
                ether_ifdetach(ifp);
                if_detach(ifp);
        }

#ifdef DIAGNOSTIC
        if (sc->axen_ep[AXEN_ENDPT_TX] != NULL ||
            sc->axen_ep[AXEN_ENDPT_RX] != NULL ||
            sc->axen_ep[AXEN_ENDPT_INTR] != NULL)
                printf("%s: detach has active endpoints\n",
                    sc->axen_dev.dv_xname);
#endif

        splx(s);

        return 0;
}

struct mbuf *
axen_newbuf(void)
{
        struct mbuf *m;

        MGETHDR(m, M_DONTWAIT, MT_DATA);
        if (m == NULL)
                return NULL;

        MCLGET(m, M_DONTWAIT);
        if (!(m->m_flags & M_EXT)) {
                m_freem(m);
                return NULL;
        }

        m->m_len = m->m_pkthdr.len = MCLBYTES;
        m_adj(m, ETHER_ALIGN);

        return m;
}

int
axen_rx_list_init(struct axen_softc *sc)
{
        struct axen_cdata *cd;
        struct axen_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", sc->axen_dev.dv_xname, __func__));

        cd = &sc->axen_cdata;
        for (i = 0; i < AXEN_RX_LIST_CNT; i++) {
                c = &cd->axen_rx_chain[i];
                c->axen_sc = sc;
                c->axen_idx = i;
                c->axen_mbuf = NULL;
                if (c->axen_xfer == NULL) {
                        c->axen_xfer = usbd_alloc_xfer(sc->axen_udev);
                        if (c->axen_xfer == NULL)
                                return ENOBUFS;
                        c->axen_buf = usbd_alloc_buffer(c->axen_xfer,
                            sc->axen_bufsz);
                        if (c->axen_buf == NULL) {
                                usbd_free_xfer(c->axen_xfer);
                                return ENOBUFS;
                        }
                }
        }

        return 0;
}

int
axen_tx_list_init(struct axen_softc *sc)
{
        struct axen_cdata *cd;
        struct axen_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", sc->axen_dev.dv_xname, __func__));

        cd = &sc->axen_cdata;
        for (i = 0; i < AXEN_TX_LIST_CNT; i++) {
                c = &cd->axen_tx_chain[i];
                c->axen_sc = sc;
                c->axen_idx = i;
                c->axen_mbuf = NULL;
                if (c->axen_xfer == NULL) {
                        c->axen_xfer = usbd_alloc_xfer(sc->axen_udev);
                        if (c->axen_xfer == NULL)
                                return ENOBUFS;
                        c->axen_buf = usbd_alloc_buffer(c->axen_xfer,
                            sc->axen_bufsz);
                        if (c->axen_buf == NULL) {
                                usbd_free_xfer(c->axen_xfer);
                                return ENOBUFS;
                        }
                }
        }

        return 0;
}

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
void
axen_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct axen_chain       *c = (struct axen_chain *)priv;
        struct axen_softc       *sc = c->axen_sc;
        struct ifnet            *ifp = GET_IFP(sc);
        u_char                  *buf = c->axen_buf;
        struct mbuf_list        ml = MBUF_LIST_INITIALIZER();
        struct mbuf             *m;
        u_int32_t               total_len;
        u_int32_t               rx_hdr, pkt_hdr;
        u_int32_t               *hdr_p;
        u_int16_t               hdr_offset, pkt_count;
        size_t                  pkt_len;
        size_t                  temp;
        int                     padlen, s;

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

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

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                if (usbd_ratecheck(&sc->axen_rx_notice)) {
                        printf("%s: usb errors on rx: %s\n",
                            sc->axen_dev.dv_xname, usbd_errstr(status));
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->axen_ep[AXEN_ENDPT_RX]);
                goto done;
        }

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

        if (total_len < sizeof(pkt_hdr)) {
                ifp->if_ierrors++;
                goto done;
        }

        /* 
         * buffer map
         *
         * for ax88179
         * [packet #0]...[packet #n][pkt hdr#0]..[pkt hdr#n][recv_hdr]
         *
         * for ax88179a
         * [packet #0]...[packet #n][pkt hdr#0][dummy_hdr]..
         * [pkt hdr#n][dummy_hdr][recv_hdr]
         *
         * each packet has 0xeeee as pseudo header..
         */
        hdr_p = (u_int32_t *)(buf + total_len - sizeof(u_int32_t));
        rx_hdr = letoh32(*hdr_p);
        hdr_offset = (u_int16_t)(rx_hdr >> 16);
        pkt_count  = (u_int16_t)(rx_hdr & 0xffff);

        if (total_len > sc->axen_bufsz) {
                printf("%s: rxeof: too large transfer\n",
                    sc->axen_dev.dv_xname);
                goto done;
        }

        /* sanity check */
        if (hdr_offset > total_len) {
                ifp->if_ierrors++;
                goto done;
        }

        /* point first packet header */
        hdr_p = (u_int32_t*)(buf + hdr_offset);

        /*
         * ax88179 will pack multiple ip packet to a USB transaction.
         * process all of packets in the buffer
         */

#if 1 /* XXX: paranoiac check. need to remove later */
#define AXEN_MAX_PACKED_PACKET 200 
        if (pkt_count > AXEN_MAX_PACKED_PACKET) {
                DPRINTF(("Too many packets (%d) in a transaction, discard.\n", 
                    pkt_count));
                goto done;
        }
#endif

        /* skip pseudo header (2byte) */
        padlen = 2;
        /* skip trailer padding (4Byte) for ax88179 */
        if (!(sc->axen_flags & (AX179A | AX772D)))
                padlen += 4;

        do {
                pkt_hdr = letoh32(*hdr_p);
                pkt_len = (pkt_hdr >> 16) & 0x1fff;

                DPRINTFN(10,("rxeof: packet#%d, pkt_hdr 0x%08x, pkt_len %zu\n",
                   pkt_count, pkt_hdr, pkt_len));

                /* skip dummy packet header */
                if (pkt_len == 0)
                        goto nextpkt;

                if ((buf[0] != 0xee) || (buf[1] != 0xee)){
                        printf("%s: invalid buffer(pkt#%d), continue\n",
                            sc->axen_dev.dv_xname, pkt_count);
                        ifp->if_ierrors += pkt_count;
                        goto done;
                }

                if ((pkt_hdr & AXEN_RXHDR_CRC_ERR) ||
                    (pkt_hdr & AXEN_RXHDR_DROP_ERR)) {
                        ifp->if_ierrors++;
                        /* move to next pkt header */
                        DPRINTF(("crc err(pkt#%d)\n", pkt_count));
                        goto nextpkt;
                }

                /* process each packet */
                /* allocate mbuf */
                m = axen_newbuf();
                if (m == NULL) {
                        ifp->if_ierrors++;
                        goto nextpkt;
                }

                m->m_pkthdr.len = m->m_len = pkt_len - padlen;

#ifdef AXEN_TOE
                /* checksum err */
                if ((pkt_hdr & AXEN_RXHDR_L3CSUM_ERR) || 
                    (pkt_hdr & AXEN_RXHDR_L4CSUM_ERR)) {
                        printf("%s: checksum err (pkt#%d)\n",
                            sc->axen_dev.dv_xname, pkt_count);
                        goto nextpkt;
                } else {
                        m->m_pkthdr.csum_flags |= M_IPV4_CSUM_IN_OK;
                }

                int l4_type;
                l4_type = (pkt_hdr & AXEN_RXHDR_L4_TYPE_MASK) >> 
                    AXEN_RXHDR_L4_TYPE_OFFSET;

                if ((l4_type == AXEN_RXHDR_L4_TYPE_TCP) ||
                    (l4_type == AXEN_RXHDR_L4_TYPE_UDP)) 
                        m->m_pkthdr.csum_flags |= M_TCP_CSUM_IN_OK |
                            M_UDP_CSUM_IN_OK;
#endif

                memcpy(mtod(m, char *), buf + 2, pkt_len - padlen);

                ml_enqueue(&ml, m);

nextpkt:
                /*
                 * prepare next packet 
                 * as each packet will be aligned 8byte boundary,
                 * need to fix up the start point of the buffer.
                 */
                temp = ((pkt_len + 7) & 0xfff8);
                buf = buf + temp;
                hdr_p++;
                pkt_count--;
        } while( pkt_count > 0);

done:
        /* push the packet up */
        s = splnet();
        if_input(ifp, &ml);
        splx(s);

        /* clear buffer for next transaction */
        memset(c->axen_buf, 0, sc->axen_bufsz);

        /* Setup new transfer. */
        usbd_setup_xfer(xfer, sc->axen_ep[AXEN_ENDPT_RX],
            c, c->axen_buf, sc->axen_bufsz,
            USBD_SHORT_XFER_OK | USBD_NO_COPY,
            USBD_NO_TIMEOUT, axen_rxeof);
        usbd_transfer(xfer);

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

/*
 * A frame was downloaded to the chip. It's safe for us to clean up
 * the list buffers.
 */
void
axen_txeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct axen_softc       *sc;
        struct axen_chain       *c;
        struct ifnet            *ifp;
        int                     s;

        c = priv;
        sc = c->axen_sc;
        ifp = &sc->arpcom.ac_if;

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

        s = splnet();

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        splx(s);
                        return;
                }
                ifp->if_oerrors++;
                printf("axen%d: usb error on tx: %s\n", sc->axen_unit,
                    usbd_errstr(status));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->axen_ep[AXEN_ENDPT_TX]);
                splx(s);
                return;
        }

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

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

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

        splx(s);
}

void
axen_tick(void *xsc)
{
        struct axen_softc *sc = xsc;

        if (sc == NULL)
                return;

        DPRINTFN(0xff, ("%s: %s: enter\n", sc->axen_dev.dv_xname,
                        __func__));

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

        /* Perform periodic stuff in process context */
        usb_add_task(sc->axen_udev, &sc->axen_tick_task);
}

void
axen_tick_task(void *xsc)
{
        int                     s;
        struct axen_softc       *sc;
        struct mii_data         *mii;

        sc = xsc;

        if (sc == NULL)
                return;

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

        mii = GET_MII(sc);
        if (mii == NULL)
                return;

        s = splnet();

        mii_tick(mii);
        if (sc->axen_link == 0)
                axen_miibus_statchg(&sc->axen_dev);
        timeout_add_sec(&sc->axen_stat_ch, 1);

        splx(s);
}

int
axen_encap(struct axen_softc *sc, struct mbuf *m, int idx)
{
        struct axen_chain       *c;
        usbd_status             err;
        struct axen_sframe_hdr  hdr;
        int                     length, boundary;

        c = &sc->axen_cdata.axen_tx_chain[idx];

        switch (sc->axen_udev->speed) {
        case USB_SPEED_FULL:
                boundary = 64;
                break;
        case USB_SPEED_HIGH:
                boundary = 512;
                break;
        case USB_SPEED_SUPER:
                boundary = 4096; /* XXX */
                break;
        default:
                printf("%s: not supported usb bus type", sc->axen_dev.dv_xname);
                return EIO;
        }

        hdr.plen = htole32(m->m_pkthdr.len);
        hdr.gso = 0; /* disable segmentation offloading */

        memcpy(c->axen_buf, &hdr, sizeof(hdr));
        length = sizeof(hdr);

        m_copydata(m, 0, m->m_pkthdr.len, c->axen_buf + length);
        length += m->m_pkthdr.len;

        if ((length % boundary) == 0) {
                hdr.plen = 0x0;
                hdr.gso |= 0x80008000;  /* enable padding */
                memcpy(c->axen_buf + length, &hdr, sizeof(hdr));
                length += sizeof(hdr);
        }

        c->axen_mbuf = m;

        usbd_setup_xfer(c->axen_xfer, sc->axen_ep[AXEN_ENDPT_TX],
            c, c->axen_buf, length, USBD_FORCE_SHORT_XFER | USBD_NO_COPY,
            10000, axen_txeof);

        /* Transmit */
        err = usbd_transfer(c->axen_xfer);
        if (err != USBD_IN_PROGRESS) {
                c->axen_mbuf = NULL;
                axen_stop(sc);
                return EIO;
        }

        sc->axen_cdata.axen_tx_cnt++;

        return 0;
}

void
axen_start(struct ifnet *ifp)
{
        struct axen_softc       *sc;
        struct mbuf             *m_head = NULL;

        sc = ifp->if_softc;

        if (!sc->axen_link)
                return;

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

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

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

        /*
         * If there's a BPF listener, bounce a copy of this frame
         * to him.
         */
#if NBPFILTER > 0
        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
axen_init(void *xsc)
{
        struct axen_softc       *sc = xsc;
        struct ifnet            *ifp = &sc->arpcom.ac_if;
        struct axen_chain       *c;
        usbd_status             err;
        int                     i, s;
        uByte                   bval;
        uWord                   wval;
        uint16_t                rxmode;

        s = splnet();

        /*
         * Cancel pending I/O and free all RX/TX buffers.
         */
        axen_reset(sc);

        /* XXX: ? */
        bval = 0x01;
        axen_lock_mii(sc);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE, 1, AXEN_UNK_28, &bval);
        axen_unlock_mii(sc);

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

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

        /* Program promiscuous mode and multicast filters. */
        axen_iff(sc);

        /* Enable receiver, set RX mode */
        axen_lock_mii(sc);
        axen_cmd(sc, AXEN_CMD_MAC_READ2, 2, AXEN_MAC_RXCTL, &wval);
        rxmode = UGETW(wval);
        rxmode |= AXEN_RXCTL_START;
        USETW(wval, rxmode);
        axen_cmd(sc, AXEN_CMD_MAC_WRITE2, 2, AXEN_MAC_RXCTL, &wval);
        axen_unlock_mii(sc);

        /* Open RX and TX pipes. */
        err = usbd_open_pipe(sc->axen_iface, sc->axen_ed[AXEN_ENDPT_RX],
            USBD_EXCLUSIVE_USE, &sc->axen_ep[AXEN_ENDPT_RX]);
        if (err) {
                printf("axen%d: open rx pipe failed: %s\n",
                    sc->axen_unit, usbd_errstr(err));
                splx(s);
                return;
        }

        err = usbd_open_pipe(sc->axen_iface, sc->axen_ed[AXEN_ENDPT_TX],
            USBD_EXCLUSIVE_USE, &sc->axen_ep[AXEN_ENDPT_TX]);
        if (err) {
                printf("axen%d: open tx pipe failed: %s\n",
                    sc->axen_unit, usbd_errstr(err));
                splx(s);
                return;
        }

        /* Start up the receive pipe. */
        for (i = 0; i < AXEN_RX_LIST_CNT; i++) {
                c = &sc->axen_cdata.axen_rx_chain[i];
                usbd_setup_xfer(c->axen_xfer, sc->axen_ep[AXEN_ENDPT_RX],
                    c, c->axen_buf, sc->axen_bufsz,
                    USBD_SHORT_XFER_OK | USBD_NO_COPY,
                    USBD_NO_TIMEOUT, axen_rxeof);
                usbd_transfer(c->axen_xfer);
        }

        sc->axen_link = 0;
        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        splx(s);

        timeout_add_sec(&sc->axen_stat_ch, 1);
        return;
}

int
axen_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct axen_softc       *sc = ifp->if_softc;
        struct ifreq            *ifr = (struct ifreq *)data;
        int                     s;
        int                     error = 0;

        s = splnet();

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

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

        case SIOCGIFMEDIA:
        case SIOCSIFMEDIA:
                error = ifmedia_ioctl(ifp, ifr, &sc->axen_mii.mii_media, cmd);
                break;

#if 0
        case SCIOCSIFMTU:
                /* XXX need to set AX_MEDIUM_JUMBO_EN here? */
                /* fall through */
#endif
        default:
                error = ether_ioctl(ifp, &sc->arpcom, cmd, data);
        }

        if (error == ENETRESET) {
                if (ifp->if_flags & IFF_RUNNING)
                        axen_iff(sc);
                error = 0;
        }

        splx(s);

        return error;
}

void
axen_watchdog(struct ifnet *ifp)
{
        struct axen_softc       *sc;
        struct axen_chain       *c;
        usbd_status             stat;
        int                     s;

        sc = ifp->if_softc;

        ifp->if_oerrors++;
        printf("axen%d: watchdog timeout\n", sc->axen_unit);

        s = splusb();
        c = &sc->axen_cdata.axen_tx_chain[0];
        usbd_get_xfer_status(c->axen_xfer, NULL, NULL, NULL, &stat);
        axen_txeof(c->axen_xfer, c, stat);

        if (!ifq_empty(&ifp->if_snd))
                axen_start(ifp);
        splx(s);
}

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

        axen_reset(sc);

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

        timeout_del(&sc->axen_stat_ch);

        /* Stop transfers. */
        if (sc->axen_ep[AXEN_ENDPT_RX] != NULL) {
                err = usbd_close_pipe(sc->axen_ep[AXEN_ENDPT_RX]);
                if (err) {
                        printf("axen%d: close rx pipe failed: %s\n",
                            sc->axen_unit, usbd_errstr(err));
                }
                sc->axen_ep[AXEN_ENDPT_RX] = NULL;
        }

        if (sc->axen_ep[AXEN_ENDPT_TX] != NULL) {
                err = usbd_close_pipe(sc->axen_ep[AXEN_ENDPT_TX]);
                if (err) {
                        printf("axen%d: close tx pipe failed: %s\n",
                            sc->axen_unit, usbd_errstr(err));
                }
                sc->axen_ep[AXEN_ENDPT_TX] = NULL;
        }

        if (sc->axen_ep[AXEN_ENDPT_INTR] != NULL) {
                err = usbd_close_pipe(sc->axen_ep[AXEN_ENDPT_INTR]);
                if (err) {
                        printf("axen%d: close intr pipe failed: %s\n",
                            sc->axen_unit, usbd_errstr(err));
                }
                sc->axen_ep[AXEN_ENDPT_INTR] = NULL;
        }

        /* Free RX resources. */
        for (i = 0; i < AXEN_RX_LIST_CNT; i++) {
                if (sc->axen_cdata.axen_rx_chain[i].axen_mbuf != NULL) {
                        m_freem(sc->axen_cdata.axen_rx_chain[i].axen_mbuf);
                        sc->axen_cdata.axen_rx_chain[i].axen_mbuf = NULL;
                }
                if (sc->axen_cdata.axen_rx_chain[i].axen_xfer != NULL) {
                        usbd_free_xfer(sc->axen_cdata.axen_rx_chain[i].axen_xfer);
                        sc->axen_cdata.axen_rx_chain[i].axen_xfer = NULL;
                }
        }

        /* Free TX resources. */
        for (i = 0; i < AXEN_TX_LIST_CNT; i++) {

                if (sc->axen_cdata.axen_tx_chain[i].axen_mbuf != NULL) {
                        m_freem(sc->axen_cdata.axen_tx_chain[i].axen_mbuf);
                        sc->axen_cdata.axen_tx_chain[i].axen_mbuf = NULL;
                }
                if (sc->axen_cdata.axen_tx_chain[i].axen_xfer != NULL) {
                        usbd_free_xfer(sc->axen_cdata.axen_tx_chain[i].axen_xfer);
                        sc->axen_cdata.axen_tx_chain[i].axen_xfer = NULL;
                }
        }

        sc->axen_link = 0;
}