Driver for 3c505 boards. Uses the onboard firmware, which is not a good

way to do it.  Doesn't support DMA or high speeds.

Contributed by:	Dean Huxley <dean@fsa.ca> via NetBSD

1 files changed, 856 insertions, 0 deletions

diff --git a/sys/i386/isa/if_eg.c b/sys/i386/isa/if_eg.c
new file mode 100644
index 0000000..a568941
--- /dev/null
+++ b/sys/i386/isa/if_eg.c
@@ -0,0 +1,856 @@
+/*
+ * Copyright (c) 1993 Dean Huxley <dean@fsa.ca>
+ * 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 Dean Huxley.
+ * 4. The name of Dean Huxley may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ *
+ * $Id$
+ */
+
+/* To do:
+ * - multicast
+ * - promiscuous
+ */
+#include "eg.h"
+#include "bpfilter.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/ioctl.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/syslog.h>
+#include <sys/devconf.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+
+#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
+
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#include <net/bpfdesc.h>
+#endif
+
+#include <machine/cpu.h>
+#include <machine/clock.h>
+
+#include <i386/isa/isa.h>
+#include <i386/isa/isa_device.h>
+#include <i386/isa/icu.h>
+#include <i386/isa/if_egreg.h>
+
+/* for debugging convenience */
+#ifdef EGDEBUG
+#define dprintf(x) printf x
+#else
+#define dprintf(x)
+#endif
+
+#define ETHER_MIN_LEN	64
+#define ETHER_MAX_LEN	1518
+#define ETHER_ADDR_LEN	6
+
+#define EG_INLEN  	10
+#define EG_BUFLEN	0x0670
+
+/*
+ * Ethernet software status per interface.
+ */
+struct eg_softc {
+	/* struct device sc_dev; */
+	/* struct intrhand sc_ih; */
+	struct arpcom sc_arpcom;	/* Ethernet common part */
+	int eg_cmd;			/* Command register R/W */
+	int eg_ctl;			/* Control register R/W (EG_CTL_*) */
+	int eg_stat;			/* Status register R/O (EG_STAT_*) */
+	int eg_data;			/* Data register R/W (16 bits) */
+	u_char  eg_rom_major;		/* Cards ROM version (major number) */ 
+	u_char  eg_rom_minor;		/* Cards ROM version (minor number) */ 
+	short	eg_ram;			/* Amount of RAM on the card */
+	u_char	eg_pcb[64];		/* Primary Command Block buffer */
+	u_char  eg_incount;		/* Number of buffers currently used */
+	u_char  *eg_inbuf;		/* Incoming packet buffer */
+	u_char  *eg_outbuf;		/* Outgoing packet buffer */
+	struct	kern_devconf kdc;	/* kernel configuration database */
+} eg_softc[NEG];
+
+int egprobe (struct isa_device *);
+int egattach (struct isa_device *);
+
+struct isa_driver egdriver = {
+	egprobe, egattach, "eg", 0
+};
+
+static struct kern_devconf kdc_eg_template = {
+        0, 0, 0,                /* filled in by dev_attach */
+        "eg", 0, { MDDT_ISA, 0, "net" },
+        isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
+        &kdc_isa0,              /* parent */
+        0,                      /* parentdata */
+        DC_UNCONFIGURED,
+        ""                      /* description */
+};
+
+static inline void
+eg_registerdev(struct isa_device *id, const char *descr)
+{
+        struct kern_devconf *kdc = &eg_softc[id->id_unit].kdc;
+        *kdc = kdc_eg_template;
+        kdc->kdc_unit = id->id_unit;
+        kdc->kdc_parentdata = id;
+        kdc->kdc_description = descr;
+        dev_attach(kdc);
+}
+
+void egintr (int);
+static void eginit __P((struct eg_softc *));
+static int egioctl (struct ifnet *, int, caddr_t);
+static void egrecv(struct eg_softc *);
+static void egstart(struct ifnet *);
+static void egreset(int);
+static inline void egread __P((struct eg_softc *, caddr_t, int));
+static struct mbuf *egget __P((caddr_t, int, struct ifnet *));
+static void egstop __P((struct eg_softc *));
+
+/*
+ * Support stuff
+ */
+	
+static inline void
+egprintpcb(sc)
+	struct eg_softc *sc;
+{
+	int i;
+	
+	for (i = 0; i < sc->eg_pcb[1] + 2; i++)
+		dprintf(("eg#: pcb[%2d] = %x\n", i, sc->eg_pcb[i]));
+}
+
+
+static inline void
+egprintstat(b)
+	u_char b;
+{
+	dprintf(("eg#: %s %s %s %s %s %s %s\n", 
+		 (b & EG_STAT_HCRE)?"HCRE":"",
+		 (b & EG_STAT_ACRF)?"ACRF":"",
+		 (b & EG_STAT_DIR )?"DIR ":"",
+		 (b & EG_STAT_DONE)?"DONE":"",
+		 (b & EG_STAT_ASF3)?"ASF3":"",
+		 (b & EG_STAT_ASF2)?"ASF2":"",
+		 (b & EG_STAT_ASF1)?"ASF1":""));
+}
+
+static int
+egoutPCB(sc, b)
+	struct eg_softc *sc;
+	u_char b;
+{
+	int i;
+
+	for (i=0; i < 4000; i++) {
+		if (inb(sc->eg_stat) & EG_STAT_HCRE) {
+			outb(sc->eg_cmd, b);
+			return 0;
+		}
+		DELAY(10);
+	}
+	dprintf(("eg#: egoutPCB failed\n"));
+	return 1;
+}
+	
+static int
+egreadPCBstat(sc, statb)
+	struct eg_softc *sc;
+	u_char statb;
+{
+	int i;
+
+	for (i=0; i < 5000; i++) {
+		if (EG_PCB_STAT(inb(sc->eg_stat))) 
+			break;
+		DELAY(10);
+	}
+	if (EG_PCB_STAT(inb(sc->eg_stat)) == statb)
+		return 0;
+	return 1;
+}
+
+static int
+egreadPCBready(sc)
+	struct eg_softc *sc;
+{
+	int i;
+
+	for (i=0; i < 10000; i++) {
+		if (inb(sc->eg_stat) & EG_STAT_ACRF)
+			return 0;
+		DELAY(5);
+	}
+	dprintf(("eg#: PCB read not ready\n"));
+	return 1;
+}
+	
+static int
+egwritePCB(sc)
+	struct eg_softc *sc;
+{
+	int i;
+	u_char len;
+
+	outb(sc->eg_ctl, EG_PCB_MASK(inb(sc->eg_ctl)));
+
+	len = sc->eg_pcb[1] + 2;
+	for (i = 0; i < len; i++)
+		egoutPCB(sc, sc->eg_pcb[i]);
+	
+	for (i=0; i < 4000; i++) {
+		if (inb(sc->eg_stat) & EG_STAT_HCRE)
+			break;
+		DELAY(10);
+	}
+	outb(sc->eg_ctl, EG_PCB_MASK(inb(sc->eg_ctl)) | EG_PCB_DONE);
+	egoutPCB(sc, len);
+
+	if (egreadPCBstat(sc, EG_PCB_ACCEPT))
+		return 1;
+	return 0;
+}	
+	
+static int
+egreadPCB(sc)
+	struct eg_softc *sc;
+{
+	int i;
+	u_char b;
+	
+	outb(sc->eg_ctl, EG_PCB_MASK(inb(sc->eg_ctl)));
+
+	bzero(sc->eg_pcb, sizeof(sc->eg_pcb));
+
+	if (egreadPCBready(sc))
+		return 1;
+
+	sc->eg_pcb[0] = inb(sc->eg_cmd);
+	
+	if (egreadPCBready(sc))
+		return 1;
+
+	sc->eg_pcb[1] = inb(sc->eg_cmd);
+
+	if (sc->eg_pcb[1] > 62) {
+		dprintf(("eg#: len %d too large\n", sc->eg_pcb[1]));
+		return 1;
+	}
+	
+	for (i = 0; i < sc->eg_pcb[1]; i++) {
+		if (egreadPCBready(sc))
+			return 1;
+		sc->eg_pcb[2+i] = inb(sc->eg_cmd);
+	}
+	if (egreadPCBready(sc))
+		return 1;
+	if (egreadPCBstat(sc, EG_PCB_DONE))
+		return 1;
+	if ((b = inb(sc->eg_cmd)) != sc->eg_pcb[1] + 2) {
+		dprintf(("eg#: %d != %d\n", b, sc->eg_pcb[1] + 2));
+		return 1;
+	}
+	outb(sc->eg_ctl, EG_PCB_MASK(inb(sc->eg_ctl)) | EG_PCB_ACCEPT);
+	return 0;
+}
+
+/*
+ * Real stuff
+ */
+
+int
+egprobe(struct isa_device * id)
+{
+	struct eg_softc *sc = &eg_softc[id->id_unit];
+	int i;
+
+	eg_registerdev(id, "Ethernet adapter");
+
+	if (id->id_iobase & ~0x07f0 != 0) {
+		dprintf(("eg#: Weird iobase %x\n", id->id_iobase));
+		return 0;
+	}
+	
+	sc->eg_cmd = id->id_iobase + EG_COMMAND;
+	sc->eg_ctl = id->id_iobase + EG_CONTROL;
+	sc->eg_stat = id->id_iobase + EG_STATUS;
+	sc->eg_data = id->id_iobase + EG_DATA;
+
+	/* hard reset card */
+	outb(sc->eg_ctl, EG_CTL_RESET); 
+	if (inb(sc->eg_ctl) != 0xc0)
+		return 0;
+	DELAY(5000);
+	outb(sc->eg_ctl, 0);
+	if (inb(sc->eg_ctl) != 0)
+		return 0;
+	for (i = 0; i < 250; i++) {
+		DELAY(100000);
+		if (EG_PCB_STAT(inb(sc->eg_stat)) == 0)
+			break;
+	}
+	if (EG_PCB_STAT(inb(sc->eg_stat)) != 0) {
+		dprintf(("eg%d: Reset failed\n",id->id_unit));
+		return 0;
+	}
+	sc->eg_pcb[0] = EG_CMD_GETINFO; /* Get Adapter Info */
+	sc->eg_pcb[1] = 0;
+	if (egwritePCB(sc) != 0)
+		return 0;
+	
+	if (egreadPCB(sc) != 0) {
+		egprintpcb(sc);
+		return 0;
+	}
+
+	if (sc->eg_pcb[0] != EG_RSP_GETINFO || /* Get Adapter Info Response */
+	    sc->eg_pcb[1] != 0x0a) {
+		egprintpcb(sc);
+		return 0;
+	}
+	sc->eg_rom_major = sc->eg_pcb[3];
+	sc->eg_rom_minor = sc->eg_pcb[2];
+	sc->eg_ram = sc->eg_pcb[6] | (sc->eg_pcb[7] << 8);
+	
+	return 8;
+}
+
+int
+egattach (struct isa_device *id)
+{
+	struct eg_softc *sc = &eg_softc[id->id_unit];
+	struct ifnet *ifp = &sc->sc_arpcom.ac_if;
+	
+	egstop(sc);
+
+	sc->eg_pcb[0] = EG_CMD_GETEADDR; /* Get Station address */
+	sc->eg_pcb[1] = 0;
+	if (egwritePCB(sc) != 0) {
+		dprintf(("eg#: write error\n"));
+		return 0;
+	}	
+	if (egreadPCB(sc) != 0) {
+		dprintf(("eg#: read error\n"));
+		egprintpcb(sc);
+		return 0;
+	}
+
+	/* check Get station address response */
+	if (sc->eg_pcb[0] != EG_RSP_GETEADDR || sc->eg_pcb[1] != 0x06) { 
+		dprintf(("eg#: parse error\n"));
+		egprintpcb(sc);
+		return 0;
+	}
+	bcopy(&sc->eg_pcb[2], sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
+
+	printf("eg%d: address %s, type=3COM 3c505 (v%d.%02d, %dk)\n",
+	    id->id_unit,
+	    ether_sprintf(sc->sc_arpcom.ac_enaddr),
+	    sc->eg_rom_major, sc->eg_rom_minor, sc->eg_ram);
+
+	sc->eg_pcb[0] = EG_CMD_SETEADDR; /* Set station address */
+	if (egwritePCB(sc) != 0) {
+		dprintf(("eg#: write error2\n"));
+		return 0;
+	}
+	if (egreadPCB(sc) != 0) {
+		dprintf(("eg#: read error2\n"));
+		egprintpcb(sc);
+		return 0;
+	}
+	if (sc->eg_pcb[0] != EG_RSP_SETEADDR || sc->eg_pcb[1] != 0x02 ||
+	    sc->eg_pcb[2] != 0 || sc->eg_pcb[3] != 0) {
+		dprintf(("eg#: parse error2\n"));
+		egprintpcb(sc);
+		return 0;
+	}
+
+	/* Initialize ifnet structure. */
+	ifp->if_unit = id->id_unit;
+	ifp->if_name = "eg";
+	ifp->if_output = ether_output;
+	ifp->if_start = egstart;
+	ifp->if_ioctl = egioctl;
+	ifp->if_reset = egreset;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
+	
+	/* Now we can attach the interface. */
+	if_attach(ifp);
+	ether_ifattach(ifp);
+
+	/* device attach does transition from UNCONFIGURED to IDLE state */
+	sc->kdc.kdc_state = DC_IDLE;
+
+	
+#if NBPFILTER > 0
+	bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
+#endif
+	
+	return 1;
+}
+
+static void
+eginit(sc)
+	register struct eg_softc *sc;
+{
+	register struct ifnet *ifp = &sc->sc_arpcom.ac_if;
+
+	/* Address not known. */
+	if (ifp->if_addrlist == 0)
+		return;
+
+	/* soft reset the board */
+	outb(sc->eg_ctl, EG_CTL_FLSH);
+	DELAY(100);
+	outb(sc->eg_ctl, EG_CTL_ATTN);
+	DELAY(100);
+	outb(sc->eg_ctl, 0);
+	DELAY(200);
+
+	sc->eg_pcb[0] = EG_CMD_CONFIG82586; /* Configure 82586 */
+	sc->eg_pcb[1] = 2;
+	sc->eg_pcb[2] = 3; /* receive broadcast & multicast */
+	sc->eg_pcb[3] = 0;
+#ifdef EGDEBUG
+	if (egwritePCB(sc) != 0)
+		dprintf(("eg#: write error3\n"));
+#endif
+
+	if (egreadPCB(sc) != 0) {
+		dprintf(("eg#: read error\n"));
+		egprintpcb(sc);
+	} else if (sc->eg_pcb[2] != 0 || sc->eg_pcb[3] != 0)
+		printf("eg%d: configure card command failed\n", ifp->if_unit);
+
+	if (sc->eg_inbuf == NULL)
+		sc->eg_inbuf = malloc(EG_BUFLEN, M_TEMP, M_NOWAIT);
+	sc->eg_incount = 0;
+
+	if (sc->eg_outbuf == NULL)
+		sc->eg_outbuf = malloc(EG_BUFLEN, M_TEMP, M_NOWAIT);
+	
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	outb(sc->eg_ctl, EG_CTL_CMDE);
+
+	egstart(ifp);
+	egrecv(sc);
+}
+
+static void
+egrecv(struct eg_softc *sc)
+{
+
+	while (sc->eg_incount < EG_INLEN) {
+		sc->eg_pcb[0] = EG_CMD_RECVPACKET;
+		sc->eg_pcb[1] = 0x08;
+		sc->eg_pcb[2] = 0; /* address not used.. we send zero */
+		sc->eg_pcb[3] = 0;
+		sc->eg_pcb[4] = 0;
+		sc->eg_pcb[5] = 0;
+		sc->eg_pcb[6] = EG_BUFLEN & 0xff; /* our buffer size */
+		sc->eg_pcb[7] = (EG_BUFLEN >> 8) & 0xff;
+		sc->eg_pcb[8] = 0; /* timeout, 0 == none */
+		sc->eg_pcb[9] = 0;
+		if (egwritePCB(sc) == 0)
+			sc->eg_incount++;
+		else
+			break;
+	}
+}
+
+static void
+egstart(ifp)
+	struct ifnet *ifp;
+{
+	register struct eg_softc *sc = &eg_softc[ifp->if_unit];
+	struct mbuf *m0, *m;
+	int len;
+	short *ptr;
+
+	/* Don't transmit if interface is busy or not running */
+	if ((sc->sc_arpcom.ac_if.if_flags & (IFF_RUNNING|IFF_OACTIVE)) != IFF_RUNNING)
+		return;
+
+	/* Dequeue the next datagram. */
+	IF_DEQUEUE(&sc->sc_arpcom.ac_if.if_snd, m0);
+	if (m0 == NULL)
+		return;
+	
+	sc->sc_arpcom.ac_if.if_flags |= IFF_OACTIVE;
+
+	/* Copy the datagram to the buffer. */
+	len = 0;
+	for (m = m0; m; m = m->m_next) {
+		if (m->m_len == 0)
+			continue;
+		if (len + m->m_len > EG_BUFLEN) {
+			dprintf(("eg#: Packet too large to send\n"));
+			m_freem(m0);
+			sc->sc_arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
+			sc->sc_arpcom.ac_if.if_oerrors++;
+			return;
+		}
+		bcopy(mtod(m, caddr_t), sc->eg_outbuf + len, m->m_len);
+		len += m->m_len;
+	}
+#if NBPFILTER > 0
+	if (sc->sc_arpcom.ac_if.if_bpf)
+		bpf_mtap(sc->sc_arpcom.ac_if.if_bpf, m0);
+#endif
+	m_freem(m0);
+	
+	/* length must be a minimum of ETHER_MIN_LEN bytes */
+	len = max(len, ETHER_MIN_LEN);
+
+	/* set direction bit: host -> adapter */
+	outb(sc->eg_ctl, inb(sc->eg_ctl) & ~EG_CTL_DIR); 
+	
+	sc->eg_pcb[0] = EG_CMD_SENDPACKET;
+	sc->eg_pcb[1] = 0x06;
+	sc->eg_pcb[2] = 0; /* address not used, we send zero */
+	sc->eg_pcb[3] = 0;
+	sc->eg_pcb[4] = 0;
+	sc->eg_pcb[5] = 0;
+	sc->eg_pcb[6] = len & 0xff; /* length of packet */
+	sc->eg_pcb[7] = (len >> 8) & 0xff;
+	if (egwritePCB(sc) == 0) {
+		for (ptr = (short *) sc->eg_outbuf; len > 0; len -= 2) {
+			outw(sc->eg_data, *ptr++);
+			while (!(inb(sc->eg_stat) & EG_STAT_HRDY))
+				; /* XXX need timeout here */
+		}
+	} else {
+		dprintf(("eg#: egwritePCB in egstart failed\n"));
+		sc->sc_arpcom.ac_if.if_oerrors++;
+		sc->sc_arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
+	}
+	
+	/* Set direction bit : Adapter -> host */
+	outb(sc->eg_ctl, inb(sc->eg_ctl) | EG_CTL_DIR); 
+
+	return;
+}
+
+void
+egintr(int unit)
+{
+	register struct eg_softc *sc = &eg_softc[unit];
+	int i, len;
+	short *ptr;
+
+	while (inb(sc->eg_stat) & EG_STAT_ACRF) {
+		egreadPCB(sc);
+		switch (sc->eg_pcb[0]) {
+		case EG_RSP_RECVPACKET:
+			len = sc->eg_pcb[6] | (sc->eg_pcb[7] << 8);
+			for (ptr = (short *) sc->eg_inbuf; len > 0; len -= 2) {
+				while (!(inb(sc->eg_stat) & EG_STAT_HRDY))
+					;
+				*ptr++ = inw(sc->eg_data);
+			}
+			len = sc->eg_pcb[8] | (sc->eg_pcb[9] << 8);
+			egrecv(sc);
+			sc->sc_arpcom.ac_if.if_ipackets++;
+			egread(sc, sc->eg_inbuf, len);
+			sc->eg_incount--;
+			break;
+
+		case EG_RSP_SENDPACKET:
+			if (sc->eg_pcb[6] || sc->eg_pcb[7]) {
+				dprintf(("eg#: packet dropped\n"));
+				sc->sc_arpcom.ac_if.if_oerrors++;
+			} else
+				sc->sc_arpcom.ac_if.if_opackets++;
+			sc->sc_arpcom.ac_if.if_collisions += sc->eg_pcb[8] & 0xf;
+			sc->sc_arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
+			egstart(&sc->sc_arpcom.ac_if);
+			break;
+
+		case EG_RSP_GETSTATS:
+			dprintf(("eg#: Card Statistics:\n"));
+			bcopy(&sc->eg_pcb[2], &i, sizeof(i));
+			dprintf(("\tReceive Packets %d\n", i));
+			bcopy(&sc->eg_pcb[6], &i, sizeof(i));
+			dprintf(("\tTransmit Packets %d\n", i));
+			dprintf(("\tCRC errors %d\n", *(short*) &sc->eg_pcb[10]));
+			dprintf(("\talignment errors %d\n", *(short*) &sc->eg_pcb[12]));
+			dprintf(("\tno resources errors %d\n", *(short*) &sc->eg_pcb[14]));
+			dprintf(("\toverrun errors %d\n", *(short*) &sc->eg_pcb[16]));
+			break;
+			
+		default:
+			dprintf(("eg#: egintr: Unknown response %x??\n",
+			    sc->eg_pcb[0]));
+			egprintpcb(sc);
+			break;
+		}
+	}
+
+	return;
+}
+
+/*
+ * Pass a packet up to the higher levels.
+ */
+static inline void
+egread(sc, buf, len)
+	struct eg_softc *sc;
+	caddr_t buf;
+	int len;
+{
+	struct ifnet *ifp;
+	struct mbuf *m;
+	struct ether_header *eh;
+	
+	if (len <= sizeof(struct ether_header) ||
+	    len > ETHER_MAX_LEN) {
+		dprintf(("eg#: Unacceptable packet size %d\n", len));
+		sc->sc_arpcom.ac_if.if_ierrors++;
+		return;
+	}
+
+	/* Pull packet off interface. */
+	ifp = &sc->sc_arpcom.ac_if;
+	m = egget(buf, len, ifp);
+	if (m == 0) {
+		dprintf(("eg#: egget returned 0\n"));
+		sc->sc_arpcom.ac_if.if_ierrors++;
+		return;
+	}
+
+	/* We assume the header fit entirely in one mbuf. */
+	eh = mtod(m, struct ether_header *);
+
+#if NBPFILTER > 0
+	/*
+	 * Check if there's a BPF listener on this interface.
+	 * If so, hand off the raw packet to BPF.
+	 */
+	if (ifp->if_bpf) {
+		bpf_mtap(ifp->if_bpf, m);
+
+		/*
+		 * Note that the interface cannot be in promiscuous mode if
+		 * there are no BPF listeners.  And if we are in promiscuous
+		 * mode, we have to check if this packet is really ours.
+		 */
+		if ((ifp->if_flags & IFF_PROMISC) &&
+		    (eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */
+		    bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr,
+			    sizeof(eh->ether_dhost)) != 0) {
+			m_freem(m);
+			return;
+		}
+	}
+#endif
+
+	/* We assume the header fit entirely in one mbuf. */
+	m->m_pkthdr.len -= sizeof(*eh);
+	m->m_len -= sizeof(*eh);
+	m->m_data += sizeof(*eh);
+
+	ether_input(ifp, eh, m);
+}
+
+/*
+ * convert buf into mbufs
+ */
+static struct mbuf *
+egget(buf, totlen, ifp)
+	caddr_t buf;
+	int totlen;
+	struct ifnet *ifp;
+{
+	struct mbuf *top, **mp, *m;
+	int len;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == 0) {
+		dprintf(("eg#: MGETHDR returns 0\n"));
+		return 0;
+	}
+	m->m_pkthdr.rcvif = ifp;
+	m->m_pkthdr.len = totlen;
+	len = MHLEN;
+	top = 0;
+	mp = &top;
+
+	while (totlen > 0) {
+		if (top) {
+			MGET(m, M_DONTWAIT, MT_DATA);
+			if (m == 0) {
+				m_freem(top);
+				dprintf(("eg#: MGET returns 0\n"));
+				return 0;
+			}
+			len = MLEN;
+		}
+		if (totlen >= MINCLSIZE) {
+			MCLGET(m, M_DONTWAIT);
+			if (m->m_flags & M_EXT)
+				len = MCLBYTES;
+		}
+		m->m_len = len = min(totlen, len);
+		bcopy((caddr_t)buf, mtod(m, caddr_t), len);
+		buf += len;
+		totlen -= len;
+		*mp = m;
+		mp = &m->m_next;
+	}
+
+	return top;
+}
+
+static int
+egioctl(ifp, command, data)
+	register struct ifnet *ifp;
+	int command;
+	caddr_t data;
+{
+	struct eg_softc *sc = &eg_softc[ifp->if_unit];
+	register struct ifaddr *ifa = (struct ifaddr *)data;
+	int s, error = 0;
+
+	s = splimp();
+
+	switch (command) {
+
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+
+		switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+		case AF_INET:
+			eginit(sc);
+			arp_ifinit((struct arpcom *)ifp, ifa);
+			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_arpcom.ac_enaddr);
+			else
+				bcopy(ina->x_host.c_host,
+				    sc->sc_arpcom.ac_enaddr,
+				    sizeof(sc->sc_arpcom.ac_enaddr));
+			/* Set new address. */
+			eginit(sc);
+			break;
+		    }
+#endif
+		default:
+			eginit(sc);
+			break;
+		}
+		break;
+
+	case SIOCSIFFLAGS:
+		if ((ifp->if_flags & IFF_UP) == 0 &&
+		    (ifp->if_flags & IFF_RUNNING) != 0) {
+			/*
+			 * If interface is marked down and it is running, then
+			 * stop it.
+			 */
+			egstop(sc);
+			ifp->if_flags &= ~IFF_RUNNING;
+		} else if ((ifp->if_flags & IFF_UP) != 0 &&
+			   (ifp->if_flags & IFF_RUNNING) == 0) {
+			/*
+			 * If interface is marked up and it is stopped, then
+			 * start it.
+			 */
+			eginit(sc);
+		} else {
+			sc->eg_pcb[0] = EG_CMD_GETSTATS;
+			sc->eg_pcb[1] = 0;
+#ifdef EGDEBUG
+			if (egwritePCB(sc) != 0)
+				dprintf(("eg#: write error\n"));
+#endif
+			/*
+			 * XXX deal with flags changes:
+			 * IFF_MULTICAST, IFF_PROMISC,
+			 * IFF_LINK0, IFF_LINK1,
+			 */
+		}
+		break;
+
+	default:
+		error = EINVAL;
+	}
+
+	splx(s);
+	return error;
+}
+
+static void
+egreset(int unit)
+{
+	struct eg_softc *sc = &eg_softc[unit];
+	int s;
+
+	log(LOG_ERR, "eg%d: device timeout\n", unit);
+	sc->sc_arpcom.ac_if.if_oerrors++;
+
+	s = splimp();
+	egstop(sc);
+	eginit(sc);
+	splx(s);
+}
+
+static void
+egstop(sc)
+	register struct eg_softc *sc;
+{
+	
+	outb(sc->eg_ctl, 0);
+}