xref: /src/sys/arch/sun3/dev/if_le.c

/*	$NetBSD: if_le.c,v 1.12 1994/10/26 09:08:46 cgd Exp $	*/

/*-
 * Copyright (c) 1982, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Header: if_le.c,v 1.25 93/10/31 04:47:50 leres Locked
 *
 *	@(#)if_le.c	8.2 (Berkeley) 10/30/93
 */

#include "bpfilter.h"

/*
 * AMD 7990 LANCE
 */
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/errno.h>

#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#ifdef APPLETALK
#include <netddp/atalk.h>
#endif

#include <machine/autoconf.h>
#include <machine/cpu.h>

#include "if_lereg.h"
#include "if_le.h"
#include "if_le_subr.h"

/*
 * The lance has only 24 address lines.  When it accesses memory,
 * the high address lines are hard-wired to 0xFF, so we must:
 * (1) put what we want the LANCE to see above 0xFF000000, and
 * (2) mask our CPU addresses down to 24 bits for the LANCE.
 */
#define	LANCE_ADDR(x)	((u_int)(x) & 0xFFffff)
#define ISQUADALIGN(a) (((a) & 0x3) == 0)

/* console error messages */
int	ledebug = 0;

#ifdef PACKETSTATS
long	lexpacketsizes[LEMTU+1];
long	lerpacketsizes[LEMTU+1];
#endif

/* autoconfiguration driver */
void	leattach(struct device *, struct device *, void *);
int 	le_md_match(struct device *, struct cfdata *, void *args);

struct	cfdriver lecd = {
	NULL, "le",
	le_md_match, leattach,
	DV_IFNET, sizeof(struct le_softc),
};

/* Forwards */
void	lesetladrf(struct le_softc *);
void	lereset(struct device *);
int 	leinit(int);
int 	lestart(struct ifnet *);
int 	leintr(void *);
void	lexint(struct le_softc *);
void	lerint(struct le_softc *);
void	leread(struct le_softc *, char *, int);
int 	leput(char *, struct mbuf *);
struct mbuf *leget(char *, int, int, struct ifnet *);
int 	leioctl(struct ifnet *, int, caddr_t);
void	leerror(struct le_softc *, int);
void	lererror(struct le_softc *, char *);
void	lexerror(struct le_softc *);
int 	lewatchdog(int);	/* XXX */

/*
 * Interface exists: make available by filling in network interface
 * record.  System will initialize the interface when it is ready
 * to accept packets.
 */
void
leattach(parent, self, args)
	struct device *parent;
	struct device *self;
	void *args;
{
	struct le_softc *sc = (struct le_softc *)self;
	volatile struct lereg2 *ler2;
	struct ifnet *ifp = &sc->sc_if;
	int pri;
	u_int a;

	le_md_attach(parent, self, args);
	printf(": ether address %s\n", ether_sprintf(sc->sc_addr));

	/*
	 * Setup for transmit/receive
	 *
	 * According to Van, some versions of the Lance only use this
	 * address to receive packets; it doesn't put them in
	 * output packets. We'll want to make sure that lestart()
	 * installs the address.
	 */
	ler2 = sc->sc_r2;
	ler2->ler2_padr[0] = sc->sc_addr[1];
	ler2->ler2_padr[1] = sc->sc_addr[0];
	ler2->ler2_padr[2] = sc->sc_addr[3];
	ler2->ler2_padr[3] = sc->sc_addr[2];
	ler2->ler2_padr[4] = sc->sc_addr[5];
	ler2->ler2_padr[5] = sc->sc_addr[4];
	a = LANCE_ADDR(ler2->ler2_rmd);
#ifdef	DIAGNOSTIC
	if (!ISQUADALIGN(a))
	    panic("rdra not quad aligned");
#endif
	ler2->ler2_rlen = LE_RLEN | (a >> 16);
	ler2->ler2_rdra = a;
	a = LANCE_ADDR(ler2->ler2_tmd);
#ifdef	DIAGNOSTIC
	if (!ISQUADALIGN(a))
	    panic("tdra not quad aligned");
#endif
	ler2->ler2_tlen = LE_TLEN | (a >> 16);
	ler2->ler2_tdra = a;

	/*
	 * Set up event counters.
	 */
	evcnt_attach(&sc->sc_dev, "intr", &sc->sc_intrcnt);
	evcnt_attach(&sc->sc_dev, "errs", &sc->sc_errcnt);

	ifp->if_unit = sc->sc_dev.dv_unit;
	ifp->if_name = "le";
	ifp->if_ioctl = leioctl;
	ifp->if_output = ether_output;
	ifp->if_start = lestart;
	ifp->if_watchdog = lewatchdog;	/* XXX */
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
#ifdef IFF_NOTRAILERS
	/* XXX still compile when the blasted things are gone... */
	ifp->if_flags |= IFF_NOTRAILERS;
#endif
#if NBPFILTER > 0
	bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
	if_attach(ifp);
	ether_ifattach(ifp);
}

/*
 * Setup the logical address filter
 */
void
lesetladrf(sc)
	register struct le_softc *sc;
{
	register volatile struct lereg2 *ler2 = sc->sc_r2;
	register struct ifnet *ifp = &sc->sc_if;
	register struct ether_multi *enm;
	register u_char *cp, c;
	register u_long crc;
	register int i, len;
	struct ether_multistep step;

	/*
	 * Set up multicast address filter by passing all multicast
	 * addresses through a crc generator, and then using the high
	 * order 6 bits as a index into the 64 bit logical address
	 * filter. The high order two bits select the word, while the
	 * rest of the bits select the bit within the word.
	 */

	ler2->ler2_ladrf[0] = 0;
	ler2->ler2_ladrf[1] = 0;
	ler2->ler2_ladrf[2] = 0;
	ler2->ler2_ladrf[3] = 0;
	ifp->if_flags &= ~IFF_ALLMULTI;
	ETHER_FIRST_MULTI(step, &sc->sc_ac, enm);
	while (enm != NULL) {
		if (bcmp((caddr_t)&enm->enm_addrlo,
		    (caddr_t)&enm->enm_addrhi, sizeof(enm->enm_addrlo)) != 0) {
			/*
			 * We must listen to a range of multicast
			 * addresses. For now, just accept all
			 * multicasts, rather than trying to set only
			 * those filter bits needed to match the range.
			 * (At this time, the only use of address
			 * ranges is for IP multicast routing, for
			 * which the range is big enough to require all
			 * bits set.)
			 */
			ler2->ler2_ladrf[0] = 0xffff;
			ler2->ler2_ladrf[1] = 0xffff;
			ler2->ler2_ladrf[2] = 0xffff;
			ler2->ler2_ladrf[3] = 0xffff;
			ifp->if_flags |= IFF_ALLMULTI;
			return;
		}

		/*
		 * One would think, given the AM7990 document's polynomial
		 * of 0x04c11db6, that this should be 0x6db88320 (the bit
		 * reversal of the AMD value), but that is not right.  See
		 * the BASIC listing: bit 0 (our bit 31) must then be set.
		 */
		cp = (unsigned char *)&enm->enm_addrlo;
		crc = 0xffffffff;
		for (len = 6; --len >= 0;) {
			c = *cp++;
			for (i = 0; i < 8; i++) {
				if ((c & 0x01) ^ (crc & 0x01)) {
					crc >>= 1;
					crc = crc ^ 0xedb88320;
				} else
					crc >>= 1;
				c >>= 1;
			}
		}
		/* Just want the 6 most significant bits. */
		crc = crc >> 26;

		/* Turn on the corresponding bit in the filter. */
		ler2->ler2_ladrf[crc >> 4] |= 1 << (crc & 0xf);

		ETHER_NEXT_MULTI(step, enm);
	}
}

void
lereset(dev)
	struct device *dev;
{
	struct le_softc *sc = (struct le_softc *)dev;
	volatile struct lereg1 *ler1 = sc->sc_r1;
	volatile struct lereg2 *ler2 = sc->sc_r2;
	int i, timo, stat;
	u_int a;

	if (ledebug)
	    printf("%s: resetting, reg %x, ram %x\n",
			   sc->sc_dev.dv_xname, sc->sc_r1, sc->sc_r2);

#ifdef	DIAGNOSTIC
	i = getsr();
	if ((i & PSL_IPL) < PSL_IPL3)
		panic("lereset at low ipl, sr=%x", i);
#endif

#if NBPFILTER > 0
	if (sc->sc_if.if_flags & IFF_PROMISC)
		ler2->ler2_mode = LE_MODE_NORMAL | LE_MODE_PROM;
	else
#endif
		ler2->ler2_mode = LE_MODE_NORMAL;
	ler1->ler1_rap = LE_CSR0;
	ler1->ler1_rdp = LE_C0_STOP;

	/* Setup the logical address filter */
	lesetladrf(sc);

	/* init receive and transmit rings */
	for (i = 0; i < LERBUF; i++) {
		a = LANCE_ADDR(&ler2->ler2_rbuf[i][0]);
		ler2->ler2_rmd[i].rmd0 = a;
		ler2->ler2_rmd[i].rmd1_hadr = a >> 16;
		ler2->ler2_rmd[i].rmd1_bits = LE_R1_OWN;
		ler2->ler2_rmd[i].rmd2 = -LEMTU | LE_XMD2_ONES;
		ler2->ler2_rmd[i].rmd3 = 0;
	}
	for (i = 0; i < LETBUF; i++) {
		a = LANCE_ADDR(&ler2->ler2_tbuf[i][0]);
		ler2->ler2_tmd[i].tmd0 = a;
		ler2->ler2_tmd[i].tmd1_hadr = a >> 16;
		ler2->ler2_tmd[i].tmd1_bits = 0;
		ler2->ler2_tmd[i].tmd2 = LE_XMD2_ONES;
		ler2->ler2_tmd[i].tmd3 = 0;
	}

	bzero(&ler2->ler2_rbuf[0][0], (LERBUF + LETBUF) * LEMTU);

	/* lance will stuff packet into receive buffer 0 next */
	sc->sc_rmd = 0;

	/*
	 * Tell the chip where to find the initialization block.
	 * Note that CSR1, CSR2, and CSR3 may only be accessed
	 * while the STOP bit is set in CSR0.
	 */
	a = LANCE_ADDR(&ler2->ler2_mode);
	ler1->ler1_rap = LE_CSR1;
	ler1->ler1_rdp = a;
	ler1->ler1_rap = LE_CSR2;
	ler1->ler1_rdp = a >> 16;
	ler1->ler1_rap = LE_CSR3;
	ler1->ler1_rdp = LE_C3_CONFIG;
	ler1->ler1_rap = LE_CSR0;
	ler1->ler1_rdp = LE_C0_INIT;
	timo = 10000;
	while (((stat = ler1->ler1_rdp) & (LE_C0_ERR | LE_C0_IDON)) == 0) {
		delay(100); 	/* XXX */
		if (--timo == 0) {
			printf("%s: init timeout, stat=%b\n",
			    sc->sc_dev.dv_xname, stat, LE_C0_BITS);
			break;
		}
	}
	if (stat & LE_C0_ERR) {
		printf("%s: init failed, stat=%b\n",
		    sc->sc_dev.dv_xname, stat, LE_C0_BITS);
		sc->sc_if.if_flags &= ~IFF_RUNNING; 	/* XXX */
		return;
	}
	ler1->ler1_rdp = LE_C0_IDON;	/* clear IDON */
	ler1->ler1_rdp = LE_C0_STRT | LE_C0_INEA;
	sc->sc_if.if_flags &= ~IFF_OACTIVE;
	delay(100);		/* XXX */
}

/*
 * Device timeout/watchdog routine.  Entered if the device neglects to
 * generate an interrupt after a transmit has been started on it.
 */
int
lewatchdog(unit)
	int unit;
{
	struct le_softc *sc = lecd.cd_devs[unit];
	struct ifnet *ifp = &sc->sc_if;
	int s;

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

#ifdef	DIAGNOSTIC
	s = getsr();
	if ((s & PSL_IPL) > PSL_IPL3)
		panic("lewatchdog would lower spl, sr=%x", s);
#endif

	s = splimp();	/* XXX - Can this lower the IPL? */
	lereset(&sc->sc_dev);
	lestart(&sc->sc_if);
	splx(s);
}

/*
 * Initialization of interface
 */
int
leinit(unit)
	int unit;
{
	struct le_softc *sc = lecd.cd_devs[unit];
	struct ifnet *ifp = &sc->sc_if;
	int s;

	/* not yet, if address still unknown */
	if (ifp->if_addrlist == (struct ifaddr *)0) {
		if (ledebug)
			printf("leinit: no address yet\n");
		return (0);
	}
	if ((ifp->if_flags & IFF_RUNNING) == 0) {
		s = splimp();
		if (ledebug)
		    printf("le: initializing unit %d, reg %x, ram %x\n",
				   unit, sc->sc_r1, sc->sc_r2);
		ifp->if_flags |= IFF_RUNNING;
		lereset(&sc->sc_dev);
		lestart(ifp);		/* XXX */
		splx(s);
	}
	return (0);
}

/*
 * Start output on interface.  Get another datagram to send
 * off of the interface queue, and copy it to the interface
 * before starting the output.
 */
int
lestart(ifp)
	register struct ifnet *ifp;
{
	register struct le_softc *sc = lecd.cd_devs[ifp->if_unit];
	register volatile struct letmd *tmd;
	register struct mbuf *m;
	register int len;

#ifdef	DIAGNOSTIC
	int s = getsr();
	if ((s & PSL_IPL) < PSL_IPL3)
		panic("lestart at low ipl, sr=%x", s);
#endif

	if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) {
		if (ledebug)
			printf("lestart: not running\n");
		return (0);
	}
	IF_DEQUEUE(&sc->sc_if.if_snd, m);
	if (m == 0) {
		if (ledebug & 2)
			printf("lestart: send queue empty\n");
		return (0);
	}
	len = leput(sc->sc_r2->ler2_tbuf[0], m);
#if NBPFILTER > 0
	/*
	 * If bpf is listening on this interface, let it
	 * see the packet before we commit it to the wire.
	 */
	if (sc->sc_if.if_bpf)
		bpf_tap(sc->sc_if.if_bpf, sc->sc_r2->ler2_tbuf[0], len);
#endif

#ifdef PACKETSTATS
	if (len <= LEMTU)
		lexpacketsizes[len]++;
#endif
	tmd = sc->sc_r2->ler2_tmd;
	tmd->tmd3 = 0;
	tmd->tmd2 = -len | LE_XMD2_ONES;
	tmd->tmd1_bits = LE_T1_OWN | LE_T1_STP | LE_T1_ENP;
	sc->sc_if.if_flags |= IFF_OACTIVE;

	/* Set a timer just in case we never hear from the board again. */
	ifp->if_timer = 2;

	return (0);
}

int
leintr(dev)
	register void *dev;
{
	register struct le_softc *sc = dev;
	register volatile struct lereg1 *ler1 = sc->sc_r1;
	register int csr0;

	csr0 = ler1->ler1_rdp;
	if (ledebug & 2)
	    printf("[%s: intr, stat %b]\n",
			   sc->sc_dev.dv_xname, csr0, LE_C0_BITS);

	if ((csr0 & LE_C0_INTR) == 0)
		return (0);
	sc->sc_intrcnt.ev_count++;

	if (csr0 & LE_C0_ERR) {
		sc->sc_errcnt.ev_count++;
		leerror(sc, csr0);
		if (csr0 & LE_C0_MERR) {
			sc->sc_merr++;
			lereset(&sc->sc_dev);
			return (1);
		}
		if (csr0 & LE_C0_BABL)
			sc->sc_babl++;
		if (csr0 & LE_C0_CERR)
			sc->sc_cerr++;
		if (csr0 & LE_C0_MISS)
			sc->sc_miss++;
		ler1->ler1_rdp = LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_INEA;
	}
	if ((csr0 & LE_C0_RXON) == 0) {
		sc->sc_rxoff++;
		lereset(&sc->sc_dev);
		return (1);
	}
	if ((csr0 & LE_C0_TXON) == 0) {
		sc->sc_txoff++;
		lereset(&sc->sc_dev);
		return (1);
	}
	if (csr0 & LE_C0_RINT) {
		/* interrupt is cleared in lerint */
		lerint(sc);
	}
	if (csr0 & LE_C0_TINT) {
		ler1->ler1_rdp = LE_C0_TINT|LE_C0_INEA;
		lexint(sc);
	}
	return (1);
}

/*
 * Ethernet interface transmitter interrupt.
 * Start another output if more data to send.
 */
void
lexint(sc)
	register struct le_softc *sc;
{
	register volatile struct letmd *tmd = sc->sc_r2->ler2_tmd;

	sc->sc_lestats.lexints++;
	if ((sc->sc_if.if_flags & IFF_OACTIVE) == 0) {
		sc->sc_xint++;
		return;
	}
	if (tmd->tmd1_bits & LE_T1_OWN) {
		sc->sc_xown++;
		return;
	}
	if (tmd->tmd1_bits & LE_T1_ERR) {
err:
		lexerror(sc);
		sc->sc_if.if_oerrors++;
		if (tmd->tmd3 & (LE_T3_BUFF|LE_T3_UFLO)) {
			sc->sc_uflo++;
			lereset(&sc->sc_dev);
		} else if (tmd->tmd3 & LE_T3_LCOL)
			sc->sc_if.if_collisions++;
		else if (tmd->tmd3 & LE_T3_RTRY)
			sc->sc_if.if_collisions += 16;
	}
	else if (tmd->tmd3 & LE_T3_BUFF)
		/* XXX documentation says BUFF not included in ERR */
		goto err;
	else if (tmd->tmd1_bits & LE_T1_ONE)
		sc->sc_if.if_collisions++;
	else if (tmd->tmd1_bits & LE_T1_MORE)
		/* what is the real number? */
		sc->sc_if.if_collisions += 2;
	else
		sc->sc_if.if_opackets++;
	sc->sc_if.if_flags &= ~IFF_OACTIVE;
	sc->sc_if.if_timer = 0;		/* XXX */
	lestart(&sc->sc_if);
}

#define	LENEXTRMP \
	if (++bix == LERBUF) bix = 0, rmd = sc->sc_r2->ler2_rmd; else ++rmd

/*
 * Ethernet interface receiver interrupt.
 * If input error just drop packet.
 * Decapsulate packet based on type and pass to type specific
 * higher-level input routine.
 */
void
lerint(sc)
	register struct le_softc *sc;
{
	register int bix = sc->sc_rmd;
	register volatile struct lermd *rmd = &sc->sc_r2->ler2_rmd[bix];

	sc->sc_lestats.lerints++;
	/*
	 * Out of sync with hardware, should never happen?
	 */
	if (rmd->rmd1_bits & LE_R1_OWN) {
		do {
			sc->sc_lestats.lerscans++;
			LENEXTRMP;
		} while ((rmd->rmd1_bits & LE_R1_OWN) && bix != sc->sc_rmd);
		if (bix == sc->sc_rmd)
			printf("%s: RINT with no buffer\n",
			    sc->sc_dev.dv_xname);
	} else
		sc->sc_lestats.lerhits++;

	/*
	 * Process all buffers with valid data
	 */
	while ((rmd->rmd1_bits & LE_R1_OWN) == 0) {
		int len = rmd->rmd3;

		/* Clear interrupt to avoid race condition */
		sc->sc_r1->ler1_rdp = LE_C0_RINT|LE_C0_INEA;

		if (rmd->rmd1_bits & LE_R1_ERR) {
			sc->sc_rmd = bix;
			lererror(sc, "bad packet");
			sc->sc_if.if_ierrors++;
		} else if ((rmd->rmd1_bits & (LE_R1_STP|LE_R1_ENP)) !=
		    (LE_R1_STP|LE_R1_ENP)) {
			/* XXX make a define for LE_R1_STP|LE_R1_ENP? */
			/*
			 * Find the end of the packet so we can see how long
			 * it was.  We still throw it away.
			 */
			do {
				sc->sc_r1->ler1_rdp = LE_C0_RINT|LE_C0_INEA;
				rmd->rmd3 = 0;
				rmd->rmd1_bits = LE_R1_OWN;
				LENEXTRMP;
			} while (!(rmd->rmd1_bits &
			    (LE_R1_OWN|LE_R1_ERR|LE_R1_STP|LE_R1_ENP)));
			sc->sc_rmd = bix;
			lererror(sc, "chained buffer");
			sc->sc_rxlen++;
			/*
			 * If search terminated without successful completion
			 * we reset the hardware (conservative).
			 */
			if ((rmd->rmd1_bits &
			    (LE_R1_OWN|LE_R1_ERR|LE_R1_STP|LE_R1_ENP)) !=
			    LE_R1_ENP) {
				lereset(&sc->sc_dev);
				return;
			}
		} else {
			leread(sc, sc->sc_r2->ler2_rbuf[bix], len);
#ifdef PACKETSTATS
			lerpacketsizes[len]++;
#endif
			sc->sc_lestats.lerbufs++;
		}
		rmd->rmd3 = 0;
		rmd->rmd1_bits = LE_R1_OWN;
		LENEXTRMP;
	}
	sc->sc_rmd = bix;
}

void
leread(sc, pkt, len)
	register struct le_softc *sc;
	char *pkt;
	int len;
{
	register struct ether_header *et;
	register struct ifnet *ifp = &sc->sc_if;
	struct mbuf *m;
	struct ifqueue *inq;
	int flags;

	ifp->if_ipackets++;
	et = (struct ether_header *)pkt;
	et->ether_type = ntohs((u_short)et->ether_type);
	/* adjust input length to account for header and CRC */
	len -= sizeof(struct ether_header) + 4;

	if (len <= 0) {
		if (ledebug)
			log(LOG_WARNING,
			    "%s: ierror(runt packet): from %s: len=%d\n",
			    sc->sc_dev.dv_xname,
			    ether_sprintf(et->ether_shost), len);
		sc->sc_runt++;
		ifp->if_ierrors++;
		return;
	}

	/* Setup mbuf flags we'll need later */
	flags = 0;
	if (bcmp((caddr_t)etherbroadcastaddr,
	    (caddr_t)et->ether_dhost, sizeof(etherbroadcastaddr)) == 0)
		flags |= M_BCAST;
	if (et->ether_dhost[0] & 1)
		flags |= M_MCAST;

#if NBPFILTER > 0
	/*
	 * Check if there's a bpf filter listening on this interface.
	 * If so, hand off the raw packet to enet, then discard things
	 * not destined for us (but be sure to keep broadcast/multicast).
	 */
	if (ifp->if_bpf) {
		bpf_tap(ifp->if_bpf, pkt,
		    len + sizeof(struct ether_header));
		if ((flags & (M_BCAST | M_MCAST)) == 0 &&
		    bcmp(et->ether_dhost, sc->sc_addr,
			    sizeof(et->ether_dhost)) != 0)
			return;
	}
#endif
	m = leget(pkt, len, 0, ifp);
	if (m == 0)
		return;

	ether_input(ifp, et, m);
}

/*
 * Routine to copy from mbuf chain to transmit
 * buffer in board local memory.
 *
 * ### this can be done by remapping in some cases
 */
int
leput(lebuf, m)
	register char *lebuf;
	register struct mbuf *m;
{
	register struct mbuf *mp;
	register int len, tlen = 0;

	for (mp = m; mp; mp = mp->m_next) {
		len = mp->m_len;
		if (len == 0)
			continue;
		tlen += len;
		bcopy(mtod(mp, char *), lebuf, len);
		lebuf += len;
	}
	m_freem(m);
	if (tlen < LEMINSIZE) {
		bzero(lebuf, LEMINSIZE - tlen);
		tlen = LEMINSIZE;
	}
	return (tlen);
}

/*
 * Routine to copy from board local memory into mbufs.
 */
struct mbuf *
leget(lebuf, totlen, off0, ifp)
	char *lebuf;
	int totlen, off0;
	struct ifnet *ifp;
{
	register struct mbuf *m;
	struct mbuf *top = 0, **mp = &top;
	register int off = off0, len;
	register char *cp;
	char *epkt;

	lebuf += sizeof(struct ether_header);
	cp = lebuf;
	epkt = cp + totlen;
	if (off) {
		cp += off + 2 * sizeof(u_short);
		totlen -= 2 * sizeof(u_short);
	}

	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == 0)
		return (0);
	m->m_pkthdr.rcvif = ifp;
	m->m_pkthdr.len = totlen;
	m->m_len = MHLEN;

	while (totlen > 0) {
		if (top) {
			MGET(m, M_DONTWAIT, MT_DATA);
			if (m == 0) {
				m_freem(top);
				return (0);
			}
			m->m_len = MLEN;
		}
		len = min(totlen, epkt - cp);
		if (len >= MINCLSIZE) {
			MCLGET(m, M_DONTWAIT);
			if (m->m_flags & M_EXT)
				m->m_len = len = min(len, MCLBYTES);
			else
				len = m->m_len;
		} else {
			/*
			 * Place initial small packet/header at end of mbuf.
			 */
			if (len < m->m_len) {
				if (top == 0 && len + max_linkhdr <= m->m_len)
					m->m_data += max_linkhdr;
				m->m_len = len;
			} else
				len = m->m_len;
		}
		bcopy(cp, mtod(m, caddr_t), (unsigned)len);
		cp += len;
		*mp = m;
		mp = &m->m_next;
		totlen -= len;
		if (cp == epkt)
			cp = lebuf;
	}
	return (top);
}

/*
 * Process an ioctl request.
 */
int
leioctl(ifp, cmd, data)
	register struct ifnet *ifp;
	int cmd;
	caddr_t data;
{
	register struct ifaddr *ifa;
	register struct le_softc *sc = lecd.cd_devs[ifp->if_unit];
	register volatile struct lereg1 *ler1;
	int s, error;

	/* Make sure attach was called. */
	if (sc->sc_r1 == NULL)
		return (ENXIO);

	error = 0;
	s = splimp();
	switch (cmd) {

	case SIOCSIFADDR:
		ifa = (struct ifaddr *)data;
		ifp->if_flags |= IFF_UP;
		switch (ifa->ifa_addr->sa_family) {
#ifdef INET
		case AF_INET:
			/* before arpwhohas */
		    if ((ifp->if_flags & IFF_RUNNING) == 0) 	/* XXX */
				(void)leinit(ifp->if_unit);
			((struct arpcom *)ifp)->ac_ipaddr =
				IA_SIN(ifa)->sin_addr;
			arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr);
			break;
#endif
#ifdef NS
		case AF_NS:
		    {
			register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);

			if (ns_nullhost(*ina))
				ina->x_host = *(union ns_host *)(sc->sc_addr);
			else {
				/*
				 * The manual says we can't change the address
				 * while the receiver is armed,
				 * so reset everything
				 */
				ifp->if_flags &= ~IFF_RUNNING;
				bcopy((caddr_t)ina->x_host.c_host,
				    (caddr_t)sc->sc_addr, sizeof(sc->sc_addr));
			}
			(void)leinit(ifp->if_unit);	/* does le_setaddr() */
			break;
		    }
#endif
		default:
			(void)leinit(ifp->if_unit);
			break;
		}
		break;

	case SIOCSIFFLAGS:
		ler1 = sc->sc_r1;
		if ((ifp->if_flags & IFF_UP) == 0 &&
		    ifp->if_flags & IFF_RUNNING) {
			ler1->ler1_rdp = LE_C0_STOP;
			ifp->if_flags &= ~IFF_RUNNING;
		} else if (ifp->if_flags & IFF_UP &&
		    (ifp->if_flags & IFF_RUNNING) == 0)
			(void)leinit(ifp->if_unit);
		/*
		 * If the state of the promiscuous bit changes, the interface
		 * must be reset to effect the change.
		 */
		if (((ifp->if_flags ^ sc->sc_iflags) & IFF_PROMISC) &&
		    (ifp->if_flags & IFF_RUNNING)) {
			sc->sc_iflags = ifp->if_flags;
			lereset(&sc->sc_dev);
			lestart(ifp);
		}
		break;

	case SIOCADDMULTI:
		error = ether_addmulti((struct ifreq *)data, &sc->sc_ac);
		goto update_multicast;

	case SIOCDELMULTI:
		error = ether_delmulti((struct ifreq *)data, &sc->sc_ac);
	update_multicast:
		if (error == ENETRESET) {
			/*
			 * Multicast list has changed; set the hardware
			 * filter accordingly.
			 */
			lereset(&sc->sc_dev);
			lestart(ifp);			/* XXX */
			error = 0;
		}
		break;

	default:
		error = EINVAL;
	}
	splx(s);
	return (error);
}

void
leerror(sc, stat)
	register struct le_softc *sc;
	int stat;
{
	if (!ledebug)
		return;

	/*
	 * Not all transceivers implement heartbeat
	 * so we only log CERR once.
	 */
	if ((stat & LE_C0_CERR) && sc->sc_cerr)
		return;
	log(LOG_WARNING, "%s: error: stat=%b\n",
	    sc->sc_dev.dv_xname, stat, LE_C0_BITS);
}

void
lererror(sc, msg)
	register struct le_softc *sc;
	char *msg;
{
	register volatile struct lermd *rmd;
	int len;

	if (!ledebug)
		return;

	rmd = &sc->sc_r2->ler2_rmd[sc->sc_rmd];
	len = rmd->rmd3;
	log(LOG_WARNING, "%s: ierror(%s): from %s: buf=%d, len=%d, rmd1=%b\n",
	    sc->sc_dev.dv_xname, msg, len > 11 ?
	    ether_sprintf((u_char *)&sc->sc_r2->ler2_rbuf[sc->sc_rmd][6]) :
	    "unknown",
	    sc->sc_rmd, len, rmd->rmd1_bits, LE_R1_BITS);
}

void
lexerror(sc)
	register struct le_softc *sc;
{
	register volatile struct letmd *tmd;
	register int len, tmd3, tdr;

	if (!ledebug)
		return;

	tmd = sc->sc_r2->ler2_tmd;
	tmd3 = tmd->tmd3;
	tdr = tmd3 & LE_T3_TDR_MASK;
	len = -(tmd->tmd2 & ~LE_XMD2_ONES);
	log(LOG_WARNING,
    "%s: oerror: to %s: buf=%d, len=%d, tmd1=%b, tmd3=%b, tdr=%d (%d nsecs)\n",
	    sc->sc_dev.dv_xname, len > 5 ?
	    ether_sprintf((u_char *)&sc->sc_r2->ler2_tbuf[0][0]) : "unknown",
	    0, len,
	    tmd->tmd1_bits, LE_T1_BITS,
	    tmd3, LE_T3_BITS, tdr, tdr * 100);
}