freebsd-dev/sys/dev/usb/net/if_axge.c

/*-
 * Copyright (c) 2013 Kevin Lo
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * ASIX Electronics AX88178A/AX88179 USB 2.0/3.0 gigabit ethernet driver.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/unistd.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 	axge_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_axgereg.h>

/*
 * Various supported device vendors/products.
 */

static const STRUCT_USB_HOST_ID axge_devs[] = {
#define	AXGE_DEV(v,p) { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
	AXGE_DEV(ASIX, AX88178A),
	AXGE_DEV(ASIX, AX88179),
	/* AXGE_DEV(SITECOMEU, LN032), */
#undef AXGE_DEV
};

static const struct {
	unsigned char ctrl, timer_l, timer_h, size, ifg;
} AX88179_BULKIN_SIZE[] = {
	{7, 0x4f, 0,    0x12, 0xff},
	{7, 0x20, 3,    0x16, 0xff},
	{7, 0xae, 7,    0x18, 0xff},
	{7, 0xcc, 0x4c, 0x18, 8},
};

/* prototypes */

static device_probe_t axge_probe;
static device_attach_t axge_attach;
static device_detach_t axge_detach;

static usb_callback_t axge_bulk_read_callback;
static usb_callback_t axge_bulk_write_callback;

static miibus_readreg_t axge_miibus_readreg;
static miibus_writereg_t axge_miibus_writereg;
static miibus_statchg_t axge_miibus_statchg;

static uether_fn_t axge_attach_post;
static uether_fn_t axge_init;
static uether_fn_t axge_stop;
static uether_fn_t axge_start;
static uether_fn_t axge_tick;
static uether_fn_t axge_setmulti;
static uether_fn_t axge_setpromisc;

static int	axge_read_mem(struct axge_softc *, uint8_t, uint16_t,
		    uint16_t, void *, int);
static void	axge_write_mem(struct axge_softc *, uint8_t, uint16_t,
		    uint16_t, void *, int);
static uint16_t	axge_read_cmd_2(struct axge_softc *, uint8_t, uint16_t,
		    uint16_t);
static void	axge_write_cmd_1(struct axge_softc *, uint8_t, uint16_t,
		    uint16_t, uint8_t);
static void	axge_write_cmd_2(struct axge_softc *, uint8_t, uint16_t,
		    uint16_t, uint16_t);
static void	axge_chip_init(struct axge_softc *);
static void	axge_reset(struct axge_softc *);

static int	axge_attach_post_sub(struct usb_ether *);
static int	axge_ifmedia_upd(struct ifnet *);
static void	axge_ifmedia_sts(struct ifnet *, struct ifmediareq *);
static int	axge_ioctl(struct ifnet *, u_long, caddr_t);
static int	axge_rx_frame(struct usb_ether *, struct usb_page_cache *, int);
static int	axge_rxeof(struct usb_ether *, struct usb_page_cache *,
		    unsigned int, unsigned int, struct axge_csum_hdr *);
static void	axge_csum_cfg(struct usb_ether *);

#define	AXGE_CSUM_FEATURES	(CSUM_IP | CSUM_TCP | CSUM_UDP)

#ifdef USB_DEBUG
static int axge_debug = 0;

static SYSCTL_NODE(_hw_usb, OID_AUTO, axge, CTLFLAG_RW, 0, "USB axge");
SYSCTL_INT(_hw_usb_axge, OID_AUTO, debug, CTLFLAG_RW, &axge_debug, 0,
    "Debug level");
#endif

static const struct usb_config axge_config[AXGE_N_TRANSFER] = {
	[AXGE_BULK_DT_WR] = {
		.type = UE_BULK,
		.endpoint = UE_ADDR_ANY,
		.direction = UE_DIR_OUT,
		.frames = 16,
		.bufsize = 16 * (MCLBYTES + 16),
		.flags = {.pipe_bof = 1,.force_short_xfer = 1,},
		.callback = axge_bulk_write_callback,
		.timeout = 10000,	/* 10 seconds */
	},
	[AXGE_BULK_DT_RD] = {
		.type = UE_BULK,
		.endpoint = UE_ADDR_ANY,
		.direction = UE_DIR_IN,
		.bufsize = 20480,
		.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
		.callback = axge_bulk_read_callback,
		.timeout = 0,		/* no timeout */
	},
};

static device_method_t axge_methods[] = {
	/* Device interface. */
	DEVMETHOD(device_probe,		axge_probe),
	DEVMETHOD(device_attach,	axge_attach),
	DEVMETHOD(device_detach,	axge_detach),

	/* MII interface. */
	DEVMETHOD(miibus_readreg,	axge_miibus_readreg),
	DEVMETHOD(miibus_writereg,	axge_miibus_writereg),
	DEVMETHOD(miibus_statchg,	axge_miibus_statchg),

	DEVMETHOD_END
};

static driver_t axge_driver = {
	.name = "axge",
	.methods = axge_methods,
	.size = sizeof(struct axge_softc),
};

static devclass_t axge_devclass;

DRIVER_MODULE(axge, uhub, axge_driver, axge_devclass, NULL, NULL);
DRIVER_MODULE(miibus, axge, miibus_driver, miibus_devclass, NULL, NULL);
MODULE_DEPEND(axge, uether, 1, 1, 1);
MODULE_DEPEND(axge, usb, 1, 1, 1);
MODULE_DEPEND(axge, ether, 1, 1, 1);
MODULE_DEPEND(axge, miibus, 1, 1, 1);
MODULE_VERSION(axge, 1);

static const struct usb_ether_methods axge_ue_methods = {
	.ue_attach_post = axge_attach_post,
	.ue_attach_post_sub = axge_attach_post_sub,
	.ue_start = axge_start,
	.ue_init = axge_init,
	.ue_stop = axge_stop,
	.ue_tick = axge_tick,
	.ue_setmulti = axge_setmulti,
	.ue_setpromisc = axge_setpromisc,
	.ue_mii_upd = axge_ifmedia_upd,
	.ue_mii_sts = axge_ifmedia_sts,
};

static int
axge_read_mem(struct axge_softc *sc, uint8_t cmd, uint16_t index,
    uint16_t val, void *buf, int len)
{
	struct usb_device_request req;

	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	req.bmRequestType = UT_READ_VENDOR_DEVICE;
	req.bRequest = cmd;
	USETW(req.wValue, val);
	USETW(req.wIndex, index);
	USETW(req.wLength, len);

	return (uether_do_request(&sc->sc_ue, &req, buf, 1000));
}

static void
axge_write_mem(struct axge_softc *sc, uint8_t cmd, uint16_t index,
    uint16_t val, void *buf, int len)
{
	struct usb_device_request req;

	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
	req.bRequest = cmd;
	USETW(req.wValue, val);
	USETW(req.wIndex, index);
	USETW(req.wLength, len);

	if (uether_do_request(&sc->sc_ue, &req, buf, 1000)) {
		/* Error ignored. */
	}
}

static uint16_t
axge_read_cmd_2(struct axge_softc *sc, uint8_t cmd, uint16_t index,
    uint16_t reg)
{
	uint8_t val[2];

	axge_read_mem(sc, cmd, index, reg, &val, 2);
	return (UGETW(val));
}

static void
axge_write_cmd_1(struct axge_softc *sc, uint8_t cmd, uint16_t index,
    uint16_t reg, uint8_t val)
{
	axge_write_mem(sc, cmd, index, reg, &val, 1);
}

static void
axge_write_cmd_2(struct axge_softc *sc, uint8_t cmd, uint16_t index,
    uint16_t reg, uint16_t val)
{
	uint8_t temp[2];

	USETW(temp, val);
	axge_write_mem(sc, cmd, index, reg, &temp, 2);
}

static int
axge_miibus_readreg(device_t dev, int phy, int reg)
{
	struct axge_softc *sc;
	uint16_t val;
	int locked;

	sc = device_get_softc(dev);
	locked = mtx_owned(&sc->sc_mtx);
	if (!locked)
		AXGE_LOCK(sc);

	val = axge_read_cmd_2(sc, AXGE_ACCESS_PHY, reg, phy);

	if (!locked)
		AXGE_UNLOCK(sc);

	return (val);
}

static int
axge_miibus_writereg(device_t dev, int phy, int reg, int val)
{
	struct axge_softc *sc;
	int locked;

	sc = device_get_softc(dev);
	if (sc->sc_phyno != phy)
		return (0);
	locked = mtx_owned(&sc->sc_mtx);
	if (!locked)
		AXGE_LOCK(sc);

	axge_write_cmd_2(sc, AXGE_ACCESS_PHY, reg, phy, val);

	if (!locked)
		AXGE_UNLOCK(sc);

	return (0);
}

static void
axge_miibus_statchg(device_t dev)
{
	struct axge_softc *sc;
	struct mii_data *mii;
	struct ifnet *ifp;
	uint16_t val;
	int locked;

	sc = device_get_softc(dev);
	mii = GET_MII(sc);
	locked = mtx_owned(&sc->sc_mtx);
	if (!locked)
		AXGE_LOCK(sc);

	ifp = uether_getifp(&sc->sc_ue);
	if (mii == NULL || ifp == NULL ||
	    (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
		goto done;

	sc->sc_flags &= ~AXGE_FLAG_LINK;
	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:
		case IFM_1000_T:
			sc->sc_flags |= AXGE_FLAG_LINK;
			break;
		default:
			break;
		}
	}

	/* Lost link, do nothing. */
	if ((sc->sc_flags & AXGE_FLAG_LINK) == 0)
		goto done;

	val = 0;
	if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0) {
		val |= AXGE_MEDIUM_FULL_DUPLEX;
		if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_TXPAUSE) != 0)
			val |= AXGE_MEDIUM_TXFLOW_CTRLEN;
		if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_RXPAUSE) != 0)
			val |= AXGE_MEDIUM_RXFLOW_CTRLEN;
	}
	val |=  AXGE_MEDIUM_RECEIVE_EN | AXGE_MEDIUM_ALWAYS_ONE;
	switch (IFM_SUBTYPE(mii->mii_media_active)) {
	case IFM_1000_T:
		val |= AXGE_MEDIUM_GIGAMODE;
	case IFM_100_TX:
		val |= AXGE_MEDIUM_PS;
	case IFM_10_T:
		/* Doesn't need to be handled. */
		break;
	}
	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_MEDIUM_STATUS_MODE, val);

done:
	if (!locked)
		AXGE_UNLOCK(sc);
}

static void
axge_chip_init(struct axge_softc *sc)
{
	/* Power up ethernet PHY. */
	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_PHYPWR_RSTCTL, 0);
	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_PHYPWR_RSTCTL,
	    AXGE_PHYPWR_RSTCTL_IPRL);
	uether_pause(&sc->sc_ue, hz / 4);
	axge_write_cmd_1(sc, AXGE_ACCESS_MAC, 1, AXGE_CLK_SELECT,
	    AXGE_CLK_SELECT_ACS | AXGE_CLK_SELECT_BCS);
	uether_pause(&sc->sc_ue, hz / 10);
}

static void
axge_reset(struct axge_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);

	/* Reinitialize controller to achieve full reset. */
	axge_chip_init(sc);
}

static void
axge_attach_post(struct usb_ether *ue)
{
	struct axge_softc *sc;
	uint8_t tmp[5];

	sc = uether_getsc(ue);
	sc->sc_phyno = 3;

	/* Initialize controller and get station address. */
	axge_chip_init(sc);

	memcpy(tmp, &AX88179_BULKIN_SIZE[0], 5);
	axge_read_mem(sc, AXGE_ACCESS_MAC, 5, AXGE_RX_BULKIN_QCTRL, tmp, 5);
	axge_read_mem(sc, AXGE_ACCESS_MAC, ETHER_ADDR_LEN, AXGE_NODE_ID,
	    ue->ue_eaddr, ETHER_ADDR_LEN);
}

static int
axge_attach_post_sub(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	int error;

	sc = uether_getsc(ue);
	ifp = ue->ue_ifp;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_start = uether_start;
	ifp->if_ioctl = axge_ioctl;
	ifp->if_init = uether_init;
	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
	IFQ_SET_READY(&ifp->if_snd);

	ifp->if_capabilities |= IFCAP_VLAN_MTU | IFCAP_TXCSUM | IFCAP_RXCSUM;
	ifp->if_hwassist = AXGE_CSUM_FEATURES;
	ifp->if_capenable = ifp->if_capabilities;

	mtx_lock(&Giant);
	error = mii_attach(ue->ue_dev, &ue->ue_miibus, ifp,
	    uether_ifmedia_upd, ue->ue_methods->ue_mii_sts,
	    BMSR_DEFCAPMASK, sc->sc_phyno, MII_OFFSET_ANY, 0);
	mtx_unlock(&Giant);

	return (error);
}

/*
 * Set media options.
 */
static int
axge_ifmedia_upd(struct ifnet *ifp)
{
	struct axge_softc *sc;
	struct mii_data *mii;
	struct mii_softc *miisc;
	int error;

	sc = ifp->if_softc;
	mii = GET_MII(sc);
	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
	    PHY_RESET(miisc);
	error = mii_mediachg(mii);

	return (error);
}

/*
 * Report current media status.
 */
static void
axge_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
	struct axge_softc *sc;
	struct mii_data *mii;

	sc = ifp->if_softc;
	mii = GET_MII(sc);
	AXGE_LOCK(sc);
	mii_pollstat(mii);
	ifmr->ifm_active = mii->mii_media_active;
	ifmr->ifm_status = mii->mii_media_status;
	AXGE_UNLOCK(sc);
}

/*
 * Probe for a AX88179 chip.
 */
static int
axge_probe(device_t dev)
{
	struct usb_attach_arg *uaa;

	uaa = device_get_ivars(dev);
	if (uaa->usb_mode != USB_MODE_HOST)
		return (ENXIO);
	if (uaa->info.bConfigIndex != AXGE_CONFIG_IDX)
		return (ENXIO);
	if (uaa->info.bIfaceIndex != AXGE_IFACE_IDX)
		return (ENXIO);

	return (usbd_lookup_id_by_uaa(axge_devs, sizeof(axge_devs), uaa));
}

/*
 * Attach the interface. Allocate softc structures, do ifmedia
 * setup and ethernet/BPF attach.
 */
static int
axge_attach(device_t dev)
{
	struct usb_attach_arg *uaa;
	struct axge_softc *sc;
	struct usb_ether *ue;
	uint8_t iface_index;
	int error;

	uaa = device_get_ivars(dev);
	sc = device_get_softc(dev);
	ue = &sc->sc_ue;

	device_set_usb_desc(dev);
	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);

	iface_index = AXGE_IFACE_IDX;
	error = usbd_transfer_setup(uaa->device, &iface_index,
	    sc->sc_xfer, axge_config, AXGE_N_TRANSFER, sc, &sc->sc_mtx);
	if (error) {
		device_printf(dev, "allocating USB transfers failed\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 = &axge_ue_methods;

	error = uether_ifattach(ue);
	if (error) {
		device_printf(dev, "could not attach interface\n");
		goto detach;
	}
	return (0);			/* success */

detach:
	axge_detach(dev);
	return (ENXIO);			/* failure */
}

static int
axge_detach(device_t dev)
{
	struct axge_softc *sc;
	struct usb_ether *ue;

	sc = device_get_softc(dev);
	ue = &sc->sc_ue;
	usbd_transfer_unsetup(sc->sc_xfer, AXGE_N_TRANSFER);
	uether_ifdetach(ue);
	mtx_destroy(&sc->sc_mtx);

	return (0);
}

static void
axge_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
{
	struct axge_softc *sc;
	struct usb_ether *ue;
	struct usb_page_cache *pc;
	int actlen;

	sc = usbd_xfer_softc(xfer);
	ue = &sc->sc_ue;
	usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);

	switch (USB_GET_STATE(xfer)) {
	case USB_ST_TRANSFERRED:
		pc = usbd_xfer_get_frame(xfer, 0);
		axge_rx_frame(ue, pc, actlen);

		/* 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:
		if (error != USB_ERR_CANCELLED) {
			usbd_xfer_set_stall(xfer);
			goto tr_setup;
		}
		return;

	}
}

static void
axge_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	struct usb_page_cache *pc;
	struct mbuf *m;
	uint32_t txhdr;
	uint32_t txhdr2;
	int nframes;
	int frm_len;

	sc = usbd_xfer_softc(xfer);
	ifp = uether_getifp(&sc->sc_ue);

	switch (USB_GET_STATE(xfer)) {
	case USB_ST_TRANSFERRED:
		ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
		/* FALLTHROUGH */
	case USB_ST_SETUP:
tr_setup:
		if ((sc->sc_flags & AXGE_FLAG_LINK) == 0 ||
		    (ifp->if_drv_flags & IFF_DRV_OACTIVE) != 0) {
			/*
			 * Don't send anything if there is no link or
			 * controller is busy.
			 */
			return;
		}

		for (nframes = 0; nframes < 16 &&
		    !IFQ_DRV_IS_EMPTY(&ifp->if_snd); nframes++) {
			IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
			if (m == NULL)
				break;
			usbd_xfer_set_frame_offset(xfer, nframes * MCLBYTES,
				nframes);
			frm_len = 0;
			pc = usbd_xfer_get_frame(xfer, nframes);

			txhdr = m->m_pkthdr.len;
			txhdr = htole32(txhdr);
			usbd_copy_in(pc, 0, &txhdr, sizeof(txhdr));
			frm_len += sizeof(txhdr);

			txhdr2 = 0;
			if ((m->m_pkthdr.len + sizeof(txhdr) + sizeof(txhdr2)) %
			    usbd_xfer_max_framelen(xfer) == 0) {
				txhdr2 |= 0x80008000;
			}
			txhdr2 = htole32(txhdr2);
			usbd_copy_in(pc, frm_len, &txhdr2, sizeof(txhdr2));
			frm_len += sizeof(txhdr2);

			/* Next copy in the actual packet. */
			usbd_m_copy_in(pc, frm_len, m, 0, m->m_pkthdr.len);
			frm_len += m->m_pkthdr.len;

			/*
			 * XXX
			 * Update TX packet counter here. This is not
			 * correct way but it seems that there is no way
			 * to know how many packets are sent at the end
			 * of transfer because controller combines
			 * multiple writes into single one if there is
			 * room in TX buffer of controller.
			 */
			ifp->if_opackets++;

			/*
			 * if there's a BPF listener, bounce a copy
			 * of this frame to him:
			 */
			BPF_MTAP(ifp, m);

			m_freem(m);

			/* Set frame length. */
			usbd_xfer_set_frame_len(xfer, nframes, frm_len);
		}
		if (nframes != 0) {
			usbd_xfer_set_frames(xfer, nframes);
			usbd_transfer_submit(xfer);
			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
		}
		return;
		/* NOTREACHED */
	default:
		ifp->if_oerrors++;
		ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;

		if (error != USB_ERR_CANCELLED) {
			usbd_xfer_set_stall(xfer);
			goto tr_setup;
		}
		return;

	}
}

static void
axge_tick(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct mii_data *mii;

	sc = uether_getsc(ue);
	mii = GET_MII(sc);
	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	mii_tick(mii);
	if ((sc->sc_flags & AXGE_FLAG_LINK) == 0) {
		axge_miibus_statchg(ue->ue_dev);
		if ((sc->sc_flags & AXGE_FLAG_LINK) != 0)
			axge_start(ue);
	}
}

static void
axge_setmulti(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	struct ifmultiaddr *ifma;
	uint32_t h;
	uint16_t rxmode;
	uint8_t hashtbl[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	sc = uether_getsc(ue);
	ifp = uether_getifp(ue);
	h = 0;
	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	rxmode = axge_read_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL);
	if (ifp->if_flags & (IFF_ALLMULTI | IFF_PROMISC)) {
		rxmode |= AXGE_RX_CTL_AMALL;
		axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL, rxmode);
		return;
	}
	rxmode &= ~AXGE_RX_CTL_AMALL;

	if_maddr_rlock(ifp);
	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
		if (ifma->ifma_addr->sa_family != AF_LINK)
			continue;
		h = ether_crc32_be(LLADDR((struct sockaddr_dl *)
		    ifma->ifma_addr), ETHER_ADDR_LEN) >> 26;
		hashtbl[h / 8] |= 1 << (h % 8);
	}
	if_maddr_runlock(ifp);

	axge_write_mem(sc, AXGE_ACCESS_MAC, 8, AXGE_MULTI_FILTER_ARRY,
	    (void *)&hashtbl, 8);
	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL, rxmode);
}

static void
axge_setpromisc(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	uint16_t rxmode;

	sc = uether_getsc(ue);
	ifp = uether_getifp(ue);
	rxmode = axge_read_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL);

	if (ifp->if_flags & IFF_PROMISC)
		rxmode |= AXGE_RX_CTL_PRO;
	else
		rxmode &= ~AXGE_RX_CTL_PRO;

	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL, rxmode);
	axge_setmulti(ue);
}

static void
axge_start(struct usb_ether *ue)
{
	struct axge_softc *sc;

	sc = uether_getsc(ue);
	/*
	 * Start the USB transfers, if not already started.
	 */
	usbd_transfer_start(sc->sc_xfer[AXGE_BULK_DT_RD]);
	usbd_transfer_start(sc->sc_xfer[AXGE_BULK_DT_WR]);
}

static void
axge_init(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	uint16_t rxmode;

	sc = uether_getsc(ue);
	ifp = uether_getifp(ue);
	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
		return;

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

	axge_reset(sc);

	/* Set MAC address. */
	axge_write_mem(sc, AXGE_ACCESS_MAC, ETHER_ADDR_LEN, AXGE_NODE_ID,
	    IF_LLADDR(ifp), ETHER_ADDR_LEN);

	axge_write_cmd_1(sc, AXGE_ACCESS_MAC, 1, AXGE_PAUSE_WATERLVL_LOW, 0x34);
	axge_write_cmd_1(sc, AXGE_ACCESS_MAC, 1, AXGE_PAUSE_WATERLVL_HIGH,
	    0x52);

	/* Configure TX/RX checksum offloading. */
	axge_csum_cfg(ue);

	/* Configure RX settings. */
	rxmode = (AXGE_RX_CTL_IPE | AXGE_RX_CTL_AM | AXGE_RX_CTL_START);

	/* If we want promiscuous mode, set the allframes bit. */
	if (ifp->if_flags & IFF_PROMISC)
		rxmode |= AXGE_RX_CTL_PRO;

	if (ifp->if_flags & IFF_BROADCAST)
		rxmode |= AXGE_RX_CTL_AB;

	axge_write_cmd_2(sc, AXGE_ACCESS_MAC, 2, AXGE_RX_CTL, rxmode);

	/* Load the multicast filter. */
	axge_setmulti(ue);

	usbd_xfer_set_stall(sc->sc_xfer[AXGE_BULK_DT_WR]);

	ifp->if_drv_flags |= IFF_DRV_RUNNING;
	/* Switch to selected media. */
	axge_ifmedia_upd(ifp);
}

static void
axge_stop(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;

	sc = uether_getsc(ue);
	ifp = uether_getifp(ue);

	AXGE_LOCK_ASSERT(sc, MA_OWNED);

	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
	sc->sc_flags &= ~AXGE_FLAG_LINK;

	/*
	 * Stop all the transfers, if not already stopped:
	 */
	usbd_transfer_stop(sc->sc_xfer[AXGE_BULK_DT_WR]);
	usbd_transfer_stop(sc->sc_xfer[AXGE_BULK_DT_RD]);
}

static int
axge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
	struct usb_ether *ue;
	struct axge_softc *sc;
	struct ifreq *ifr;
	int error, mask, reinit;

	ue = ifp->if_softc;
	sc = uether_getsc(ue);
	ifr = (struct ifreq *)data;
	error = 0;
	reinit = 0;
	if (cmd == SIOCSIFCAP) {
		AXGE_LOCK(sc);
		mask = ifr->ifr_reqcap ^ ifp->if_capenable;
		if ((mask & IFCAP_TXCSUM) != 0 &&
		    (ifp->if_capabilities & IFCAP_TXCSUM) != 0) {
			ifp->if_capenable ^= IFCAP_TXCSUM;
			if ((ifp->if_capenable & IFCAP_TXCSUM) != 0)
				ifp->if_hwassist |= AXGE_CSUM_FEATURES;
			else
				ifp->if_hwassist &= ~AXGE_CSUM_FEATURES;
			reinit++;
		}
		if ((mask & IFCAP_RXCSUM) != 0 &&
		    (ifp->if_capabilities & IFCAP_RXCSUM) != 0) {
			ifp->if_capenable ^= IFCAP_RXCSUM;
			reinit++;
		}
		if (reinit > 0 && ifp->if_drv_flags & IFF_DRV_RUNNING)
			ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
		else
			reinit = 0;
		AXGE_UNLOCK(sc);
		if (reinit > 0)
			uether_init(ue);
	} else
		error = uether_ioctl(ifp, cmd, data);

	return (error);
}

static int
axge_rx_frame(struct usb_ether *ue, struct usb_page_cache *pc, int actlen)
{
	struct axge_softc *sc;
	struct axge_csum_hdr csum_hdr;
	int error, len, pos;
	int pkt_cnt;
	uint32_t rxhdr;
	uint16_t hdr_off;
	uint16_t pktlen;

	sc = uether_getsc(ue);
	pos = 0;
	len = 0;
	error = 0;

	usbd_copy_out(pc, actlen - sizeof(rxhdr), &rxhdr, sizeof(rxhdr));
	actlen -= sizeof(rxhdr);
	rxhdr = le32toh(rxhdr);

	pkt_cnt = (uint16_t)rxhdr;
	hdr_off = (uint16_t)(rxhdr >> 16);

	usbd_copy_out(pc, pos + hdr_off, &csum_hdr, sizeof(csum_hdr));
	csum_hdr.len = le16toh(csum_hdr.len);
	csum_hdr.cstatus = le16toh(csum_hdr.cstatus);

	while (pkt_cnt--) {
		if (actlen <= sizeof(csum_hdr) + sizeof(struct ether_header)) {
			error = EINVAL;
			break;
		}
		pktlen = AXGE_CSUM_RXBYTES(csum_hdr.len);

		if (pkt_cnt == 0)
			/* Skip the 2-byte IP alignment header. */
			axge_rxeof(ue, pc, 2, pktlen - 2, &csum_hdr);
	}

	if (error != 0)
		ue->ue_ifp->if_ierrors++;
	return (error);
}

static int
axge_rxeof(struct usb_ether *ue, struct usb_page_cache *pc,
    unsigned int offset, unsigned int len, struct axge_csum_hdr *csum_hdr)
{
	struct ifnet *ifp;
	struct mbuf *m;

	ifp = ue->ue_ifp;
	if (len < ETHER_HDR_LEN || len > MCLBYTES - ETHER_ALIGN) {
		ifp->if_ierrors++;
		return (EINVAL);
	}

	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
	if (m == NULL) {
		ifp->if_iqdrops++;
		return (ENOMEM);
	}
	m->m_len = m->m_pkthdr.len = MCLBYTES;
	m_adj(m, ETHER_ALIGN);

	usbd_copy_out(pc, offset, mtod(m, uint8_t *), len);

	ifp->if_ipackets++;
	m->m_pkthdr.rcvif = ifp;
	m->m_pkthdr.len = m->m_len = len;

	if (csum_hdr != NULL &&
	    csum_hdr->cstatus & AXGE_CSUM_HDR_L3_TYPE_IPV4) {
		if ((csum_hdr->cstatus & (AXGE_CSUM_HDR_L4_CSUM_ERR |
		    AXGE_RXHDR_L4CSUM_ERR)) == 0) {
			m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED |
			    CSUM_IP_VALID;
			if ((csum_hdr->cstatus & AXGE_CSUM_HDR_L4_TYPE_MASK) ==
			    AXGE_CSUM_HDR_L4_TYPE_TCP ||
			    (csum_hdr->cstatus & AXGE_CSUM_HDR_L4_TYPE_MASK) ==
			    AXGE_CSUM_HDR_L4_TYPE_UDP) {
				m->m_pkthdr.csum_flags |=
				    CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
				m->m_pkthdr.csum_data = 0xffff;
			}
		}
	}

	_IF_ENQUEUE(&ue->ue_rxq, m);
	return (0);
}

static void
axge_csum_cfg(struct usb_ether *ue)
{
	struct axge_softc *sc;
	struct ifnet *ifp;
	uint8_t csum;

	sc = uether_getsc(ue);
	AXGE_LOCK_ASSERT(sc, MA_OWNED);
	ifp = uether_getifp(ue);

	csum = 0;
	if ((ifp->if_capenable & IFCAP_TXCSUM) != 0)
		csum |= AXGE_TXCOE_IP  | AXGE_TXCOE_TCP | AXGE_TXCOE_UDP;
	axge_write_cmd_1(sc, AXGE_ACCESS_MAC, 1, AXGE_TXCOE_CTL, csum);

	csum = 0;
	if ((ifp->if_capenable & IFCAP_RXCSUM) != 0)
		csum |= AXGE_RXCOE_IP  | AXGE_RXCOE_TCP | AXGE_RXCOE_UDP |
		    AXGE_RXCOE_ICMP | AXGE_RXCOE_IGMP;
	axge_write_cmd_1(sc, AXGE_ACCESS_MAC, 1, AXGE_RXCOE_CTL, csum);
}