from kimmel@varese.cs.umass.edu (Matt Kimmel):

"el" driver for 3COM 3C501. This driver has some serious performance
problems and drops packets on the floor like hot potatos.

1 files changed, 800 insertions, 0 deletions

diff --git a/sys/i386/isa/if_el.c b/sys/i386/isa/if_el.c
new file mode 100644
index 0000000..d0de274
--- /dev/null
+++ b/sys/i386/isa/if_el.c
@@ -0,0 +1,800 @@
+/* Copyright (c) 1994, Matthew E. Kimmel.  Permission is hereby granted
+ * to use, copy, modify and distribute this software provided that both
+ * the copyright notice and this permission notice appear in all copies
+ * of the software, derivative works or modified versions, and any
+ * portions thereof.
+ *
+ * Questions, comments, bug reports and fixes to kimmel@cs.umass.edu.
+ */
+/* Except of course for the portions of code lifted from other FreeBSD
+ * drivers (mainly elread, elget and el_ioctl)
+ */
+/* 3COM Etherlink 3C501 device driver for FreeBSD */
+/* Yeah, I know these cards suck, but you can also get them for free
+ * really easily...
+ */
+/* Bugs/possible improvements:
+ *	- Does not currently support DMA
+ *	- Does not currently support multicasts
+ */
+#include "el.h"
+#if NEL > 0
+#include "bpfilter.h"
+
+#include "param.h"
+#include "systm.h"
+#include "errno.h"
+#include "ioctl.h"
+#include "mbuf.h"
+#include "socket.h"
+#include "syslog.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 "i386/isa/isa.h"
+#include "i386/isa/isa_device.h"
+#include "i386/isa/icu.h"
+#include "i386/isa/if_elreg.h"
+
+#define ETHER_MIN_LEN	64
+#define ETHER_MAX_LEN	1518
+
+/* For debugging convenience */
+#ifdef EL_DEBUG
+#define dprintf(x) printf x
+#else
+#define dprintf(x)
+#endif
+
+/* el_softc: per line info and status */
+struct el_softc {
+	struct arpcom arpcom;	/* Ethernet common */
+	u_short el_base;	/* Base I/O addr */
+	caddr_t bpf;		/* BPF magic cookie */
+	char el_pktbuf[EL_BUFSIZ]; 	/* Frame buffer */
+} el_softc[NEL];
+
+/* Prototypes */
+int el_attach(struct isa_device *);
+void el_init(int);
+void elintr(int);
+int el_ioctl(struct ifnet *,int,caddr_t);
+int el_probe(struct isa_device *);
+void el_start(struct ifnet *);
+void el_reset(int,int);
+void el_watchdog(int);
+
+static void el_stop(int);
+static int el_xmit(struct el_softc *,int);
+static inline void elread(struct el_softc *,caddr_t,int);
+static struct mbuf *elget(caddr_t,int,int,struct ifnet *);
+static inline void el_hardreset(int);
+
+/* isa_driver structure for autoconf */
+struct isa_driver eldriver = {
+	el_probe, el_attach, "el"
+};
+
+/* Probe routine.  See if the card is there and at the right place. */
+int el_probe(struct isa_device *idev)
+{
+	struct el_softc *sc;
+	u_short base; /* Just for convenience */
+	u_char station_addr[ETHER_ADDR_LEN];
+	int i;
+
+	/* Grab some info for our structure */
+	sc = &el_softc[idev->id_unit];
+	sc->el_base = idev->id_iobase;
+	base = sc->el_base;
+
+	/* First check the base */
+	if((base < 0x280) || (base > 0x3f0)) {
+		printf("el%d: ioaddr must be between 0x280 and 0x3f0\n",
+			idev->id_unit);
+		return(0);
+	}
+
+	/* Now attempt to grab the station address from the PROM
+	 * and see if it contains the 3com vendor code.
+	 */
+	dprintf(("Probing 3c501 at 0x%x...\n",base));
+
+	/* Reset the board */
+	dprintf(("Resetting board...\n"));
+	outb(base+EL_AC,EL_AC_RESET);
+	DELAY(5);
+	outb(base+EL_AC,0);
+	dprintf(("Reading station address...\n"));
+	/* Now read the address */
+	for(i=0;i<ETHER_ADDR_LEN;i++) {
+		outb(base+EL_GPBL,i);
+		station_addr[i] = inb(base+EL_EAW);
+	}
+	dprintf(("Address is %s\n",ether_sprintf(station_addr)));
+
+	/* If the vendor code is ok, return a 1.  We'll assume that
+	 * whoever configured this system is right about the IRQ.
+	 */
+	if((station_addr[0] != 0x02) || (station_addr[1] != 0x60)
+	   || (station_addr[2] != 0x8c)) {
+		dprintf(("Bad vendor code.\n"));
+		return(0);
+	} else {
+		dprintf(("Vendor code ok.\n"));
+		/* Copy the station address into the arpcom structure */
+		bcopy(station_addr,sc->arpcom.ac_enaddr,ETHER_ADDR_LEN);
+		return(1);
+	}
+}
+
+/* Attach the interface to the kernel data structures.  By the time
+ * this is called, we know that the card exists at the given I/O address.
+ * We still assume that the IRQ given is correct.
+ */
+int el_attach(struct isa_device *idev)
+{
+	struct el_softc *sc;
+	struct ifnet *ifp;
+	struct ifaddr *ifa;
+	struct sockaddr_dl *sdl;
+	u_short base;
+	int t;
+
+	dprintf(("Attaching el%d...\n",idev->id_unit));
+
+	/* Get things pointing to the right places. */
+	sc = &el_softc[idev->id_unit];
+	ifp = &sc->arpcom.ac_if;
+	base = sc->el_base;
+
+	/* Now reset the board */
+	dprintf(("Resetting board...\n"));
+	el_hardreset(idev->id_unit);
+
+	/* Initialize ifnet structure */
+	ifp->if_unit = idev->id_unit;
+	ifp->if_name = "el";
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_init = el_init;
+	ifp->if_output = ether_output;
+	ifp->if_start = el_start;
+	ifp->if_ioctl = el_ioctl;
+	ifp->if_reset = el_reset;
+	ifp->if_watchdog = el_watchdog;
+	ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS);
+
+	/* Now we can attach the interface */
+	dprintf(("Attaching interface...\n"));
+	if_attach(ifp);
+
+	/* Put the station address in the ifa address list's AF_LINK
+	 * entry, if any.
+	 */
+	ifa = ifp->if_addrlist;
+	while ((ifa != NULL) && (ifa->ifa_addr != NULL) && 
+	  (ifa->ifa_addr->sa_family != AF_LINK))
+		ifa = ifa->ifa_next;
+	if((ifa != NULL) && (ifa->ifa_addr != NULL)) {
+		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
+		sdl->sdl_type = IFT_ETHER;
+		sdl->sdl_alen = ETHER_ADDR_LEN;
+		sdl->sdl_slen = 0;
+		bcopy(sc->arpcom.ac_enaddr,LLADDR(sdl),ETHER_ADDR_LEN);
+	}
+
+	/* Print out some information for the user */
+	printf("el%d: 3c501 address %s\n",idev->id_unit,
+	  ether_sprintf(sc->arpcom.ac_enaddr));
+
+	/* Finally, attach to bpf filter if it is present. */
+#if NBPFILTER > 0
+	dprintf(("Attaching to BPF...\n"));
+	bpfattach(&sc->bpf,ifp,DLT_EN10MB,sizeof(struct ether_header));
+#endif
+
+	dprintf(("el_attach() finished.\n"));
+	return(1);
+}
+
+/* This routine resets the interface. */
+void el_reset(int unit,int uban)
+{
+	int s;
+
+	dprintf(("elreset()\n"));
+	s = splimp();
+	el_stop(unit);
+	el_init(unit);
+	splx(s);
+}
+
+static void el_stop(int unit)
+{
+	struct el_softc *sc;
+
+	sc = &el_softc[unit];
+	outb(sc->el_base+EL_AC,0);
+}
+
+/* Do a hardware reset of the 3c501.  Do not call until after el_probe()! */
+static inline void el_hardreset(int unit)
+{
+	register struct el_softc *sc;
+	register int base;
+	register int j;
+
+	sc = &el_softc[unit];
+	base = sc->el_base;
+
+	/* First reset the board */
+	outb(base+EL_AC,EL_AC_RESET);
+	DELAY(5);
+	outb(base+EL_AC,0);
+
+	/* Then give it back its ethernet address.  Thanks to the mach
+	 * source code for this undocumented goodie...
+	 */
+	for(j=0;j<ETHER_ADDR_LEN;j++)
+		outb(base+j,sc->arpcom.ac_enaddr[j]);
+}
+
+/* Initialize interface.  */
+void el_init(int unit)
+{
+	struct el_softc *sc;
+	struct ifnet *ifp;
+	int s;
+	u_short base;
+
+	/* Set up pointers */
+	sc = &el_softc[unit];
+	ifp = &sc->arpcom.ac_if;
+	base = sc->el_base;
+
+	/* If address not known, do nothing. */
+	if(ifp->if_addrlist == (struct ifaddr *)0)
+		return;
+
+	s = splimp();
+
+	/* First, reset the board. */
+	dprintf(("Resetting board...\n"));
+	el_hardreset(unit);
+
+	/* Configure rx */
+	dprintf(("Configuring rx...\n"));
+	if(ifp->if_flags & IFF_PROMISC)
+		outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+	else
+		outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+	outb(base+EL_RBC,0);
+
+	/* Configure TX */
+	dprintf(("Configuring tx...\n"));
+	outb(base+EL_TXC,0);
+
+	/* Start reception */
+	dprintf(("Starting reception...\n"));
+	outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+
+	/* Set flags appropriately */
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	/* And start output. */
+	el_start(ifp);
+
+	splx(s);
+}
+
+/* Start output on interface.  Get datagrams from the queue and output
+ * them, giving the receiver a chance between datagrams.  Call only
+ * from splimp or interrupt level!
+ */
+void el_start(struct ifnet *ifp)
+{
+	struct el_softc *sc;
+	u_short base;
+	struct mbuf *m, *m0;
+	int s, i, len, retries, done;
+
+	/* Get things pointing in the right directions */
+	sc = &el_softc[ifp->if_unit];
+	base = sc->el_base;
+
+	dprintf(("el_start()...\n"));
+	s = splimp();
+
+	/* Don't do anything if output is active */
+	if(sc->arpcom.ac_if.if_flags & IFF_OACTIVE)
+		return;
+	sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
+
+	/* The main loop.  They warned me against endless loops, but
+	 * would I listen?  NOOO....
+	 */
+	while(1) {
+		/* Dequeue the next datagram */
+		IF_DEQUEUE(&sc->arpcom.ac_if.if_snd,m0);
+
+		/* If there's nothing to send, return. */
+		if(m0 == NULL) {
+			sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
+			splx(s);
+			return;
+		}
+
+		/* Disable the receiver */
+		outb(base+EL_AC,EL_AC_HOST);
+		outb(base+EL_RBC,0);
+
+		/* Copy the datagram to the buffer. */
+		len = 0;
+		for(m = m0; m != NULL; m = m->m_next) {
+			if(m->m_len == 0)
+				continue;
+			bcopy(mtod(m,caddr_t),sc->el_pktbuf+len,m->m_len);
+			len += m->m_len;
+		}
+		m_freem(m0);
+
+		len = MAX(len,ETHER_MIN_LEN);
+
+		/* Give the packet to the bpf, if any */
+#if NBPFILTER > 0
+		if(sc->bpf)
+			bpf_tap(sc->bpf,sc->el_pktbuf,len);
+#endif
+
+		/* Transfer datagram to board */
+		dprintf(("el: xfr pkt length=%d...\n",len));
+		i = EL_BUFSIZ - len;
+		outb(base+EL_GPBL,(i & 0xff));
+		outb(base+EL_GPBH,((i>>8)&0xff));
+		outsb(base+EL_BUF,sc->el_pktbuf,len);
+
+		/* Now transmit the datagram */
+		retries=0;
+		done=0;
+		while(!done) {
+			if(el_xmit(sc,len)) { /* Something went wrong */
+				done = -1;
+				break;
+			}
+			/* Check out status */
+			i = inb(base+EL_TXS);
+			dprintf(("tx status=0x%x\n",i));
+			if(!(i & EL_TXS_READY)) {
+				dprintf(("el: err txs=%x\n",i));
+				sc->arpcom.ac_if.if_oerrors++;
+				if(i & (EL_TXS_COLL|EL_TXS_COLL16)) {
+					if((!(i & EL_TXC_DCOLL16)) && retries < 15) {
+						retries++;
+						outb(base+EL_AC,EL_AC_HOST);
+					}
+				}
+				else
+					done = 1;
+			} 
+			else {
+				sc->arpcom.ac_if.if_opackets++;
+				done = 1;
+			}
+		}
+		if(done == -1)  /* Packet not transmitted */
+			continue;
+
+		/* Now give the card a chance to receive.
+		 * Gotta love 3c501s...
+		 */
+		(void)inb(base+EL_AS);
+		outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+		splx(s);
+		/* Interrupt here */
+		s = splimp();
+	}
+}
+
+/* This function actually attempts to transmit a datagram downloaded
+ * to the board.  Call at splimp or interrupt, after downloading data!
+ * Returns 0 on success, non-0 on failure
+ */
+static int el_xmit(struct el_softc *sc,int len)
+{
+	int gpl;
+	int i;
+
+	gpl = EL_BUFSIZ - len;
+	dprintf(("el: xmit..."));
+	outb((sc->el_base)+EL_GPBL,(gpl & 0xff));
+	outb((sc->el_base)+EL_GPBH,((gpl>>8)&0xff));
+	outb((sc->el_base)+EL_AC,EL_AC_TXFRX);
+	i = 20000;
+	while((inb((sc->el_base)+EL_AS) & EL_AS_TXBUSY) && (i>0))
+		i--;
+	if(i == 0) {
+		dprintf(("tx not ready\n"));
+		sc->arpcom.ac_if.if_oerrors++;
+		return(-1);
+	}
+	dprintf(("%d cycles.\n",(20000-i)));
+	return(0);
+}
+
+/* controller interrupt */
+void elintr(int unit)
+{
+	register struct el_softc *sc;
+	register base;
+	int stat, rxstat, len, done;
+
+	/* Get things pointing properly */
+	sc = &el_softc[unit];
+	base = sc->el_base;
+
+	dprintf(("elintr: "));
+
+	/* Check board status */
+	stat = inb(base+EL_AS);
+	if(stat & EL_AS_RXBUSY) {
+		(void)inb(base+EL_RXC);
+		outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+		return;
+	}
+
+	done = 0;
+	while(!done) {
+		rxstat = inb(base+EL_RXS);
+		if(rxstat & EL_RXS_STALE) {
+			(void)inb(base+EL_RXC);
+			outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+			return;
+		}
+
+		/* If there's an overflow, reinit the board. */
+		if(!(rxstat & EL_RXS_NOFLOW)) {
+			dprintf(("overflow.\n"));
+			el_hardreset(unit);
+			/* Put board back into receive mode */
+			if(sc->arpcom.ac_if.if_flags & IFF_PROMISC)
+				outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+			else
+				outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+			(void)inb(base+EL_AS);
+			outb(base+EL_RBC,0);
+			(void)inb(base+EL_RXC);
+			outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+			return;
+		}
+
+		/* Incoming packet */
+		len = inb(base+EL_RBL);
+		len |= inb(base+EL_RBH) << 8;
+		dprintf(("receive len=%d rxstat=%x ",len,rxstat));
+		outb(base+EL_AC,EL_AC_HOST);
+
+		/* If packet too short or too long, restore rx mode and return
+		 */
+		if((len <= sizeof(struct ether_header)) || (len > ETHER_MAX_LEN)) {
+			if(sc->arpcom.ac_if.if_flags & IFF_PROMISC)
+				outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+			else
+				outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
+			(void)inb(base+EL_AS);
+			outb(base+EL_RBC,0);
+			(void)inb(base+EL_RXC);
+			outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+			return;
+		}
+
+		sc->arpcom.ac_if.if_ipackets++;
+
+		/* Copy the data into our buffer */
+		outb(base+EL_GPBL,0);
+		outb(base+EL_GPBH,0);
+		insb(base+EL_BUF,sc->el_pktbuf,len);
+		outb(base+EL_RBC,0);
+		outb(base+EL_AC,EL_AC_RX);
+		dprintf(("%s-->",ether_sprintf(sc->el_pktbuf+6)));
+		dprintf(("%s\n",ether_sprintf(sc->el_pktbuf)));
+
+		/* Pass data up to upper levels */
+		len -= sizeof(struct ether_header);
+		elread(sc,(caddr_t)(sc->el_pktbuf),len);
+
+		/* Is there another packet? */
+		stat = inb(base+EL_AS);
+
+		/* If so, do it all again (i.e. don't set done to 1) */
+		if(!(stat & EL_AS_RXBUSY)) 
+			dprintf(("<rescan> "));
+		else
+			done = 1;
+	}
+
+	(void)inb(base+EL_RXC);
+	outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
+	return;
+}
+
+/* Pass a packet up to the higher levels.  Deal with trailer protocol. */
+static inline void elread(struct el_softc *sc,caddr_t buf,int len)
+{
+	register struct ether_header *eh;
+	struct mbuf *m;
+	int off, resid;
+
+	/* Deal with trailer protocol: if type is trailer type
+	 * get true type from first 16-bit word past data.
+	 * Remember that type was trailer by setting off.
+	 */
+	eh = (struct ether_header *)buf;
+	eh->ether_type = ntohs((u_short)eh->ether_type);
+#define eldataaddr(eh,off,type)	((type)(((caddr_t)((eh)+1)+(off))))
+	if(eh->ether_type >= ETHERTYPE_TRAIL &&
+	   eh->ether_type < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) {
+		off = (eh->ether_type - ETHERTYPE_TRAIL) * 512;
+		if(off >= ETHERMTU)
+			return;
+		eh->ether_type = ntohs(*eldataaddr(eh,off,u_short *));
+		resid = ntohs(*(eldataaddr(eh,off+2,u_short *)));
+		if((off+resid) > len)
+			return;
+		len = off + resid;
+	}
+	else
+		off = 0;
+
+	if(len <= 0)
+		return;
+
+#if NBPFILTER > 0
+	/*
+	 * Check if there's a bpf filter listening on this interface.
+	 * If so, hand off the raw packet to bpf, which must deal with
+	 * trailers in its own way.
+	 */
+	if(sc->bpf) {
+		eh->ether_type = htons((u_short)eh->ether_type);
+		bpf_tap(sc->bpf,buf,len+sizeof(struct ether_header));
+		eh->ether_type = ntohs((u_short)eh->ether_type);
+
+		/*
+		 * Note that the interface cannot be in promiscuous mode if
+		 * there are no bpf listeners.  And if el are in promiscuous
+		 * mode, el have to check if this packet is really ours.
+		 *
+		 * This test does not support multicasts.
+		 */
+		if((sc->arpcom.ac_if.if_flags & IFF_PROMISC)
+		   && bcmp(eh->ether_dhost,sc->arpcom.ac_enaddr,
+			   sizeof(eh->ether_dhost)) != 0
+		   && bcmp(eh->ether_dhost,etherbroadcastaddr,
+			   sizeof(eh->ether_dhost)) != 0)
+			return;
+	}
+#endif
+
+	/*
+	 * Pull packet off interface.  Off is nonzero if packet
+	 * has trailing header; neget will then force this header
+	 * information to be at the front, but we still have to drop
+	 * the type and length which are at the front of any trailer data.
+	 */
+	m = elget(buf,len,off,&sc->arpcom.ac_if);
+	if(m == 0)
+		return;
+
+	ether_input(&sc->arpcom.ac_if,eh,m);
+}
+
+/*
+ * Pull read data off a interface.
+ * Len is length of data, with local net header stripped.
+ * Off is non-zero if a trailer protocol was used, and
+ * gives the offset of the trailer information.
+ * We copy the trailer information and then all the normal
+ * data into mbufs.  When full cluster sized units are present
+ * we copy into clusters.
+ */
+struct mbuf *
+elget(buf, totlen, off0, ifp)
+        caddr_t buf;
+        int totlen, off0;
+        struct ifnet *ifp;
+{
+        struct mbuf *top, **mp, *m, *p;
+        int off = off0, len;
+        register caddr_t cp = buf;
+        char *epkt;
+
+        buf += sizeof(struct ether_header);
+        cp = buf;
+        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;
+        top = 0;
+        mp = &top;
+        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 = buf;
+        }
+        return (top);
+}
+
+/*
+ * Process an ioctl request. This code needs some work - it looks
+ *	pretty ugly.
+ */
+int
+el_ioctl(ifp, command, data)
+	register struct ifnet *ifp;
+	int command;
+	caddr_t data;
+{
+	register struct ifaddr *ifa = (struct ifaddr *)data;
+	struct el_softc *sc = &el_softc[ifp->if_unit];
+	struct ifreq *ifr = (struct ifreq *)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:
+			el_init(ifp->if_unit);	/* before arpwhohas */
+			/*
+			 * See if another station has *our* IP address.
+			 * i.e.: There is an address conflict! If a
+			 * conflict exists, a message is sent to the
+			 * console.
+			 */
+			((struct arpcom *)ifp)->ac_ipaddr = IA_SIN(ifa)->sin_addr;
+			arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr);
+			break;
+#endif
+#ifdef NS
+		/*
+		 * XXX - This code is probably wrong
+		 */
+		case AF_NS:
+		    {
+			register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
+
+			if (ns_nullhost(*ina))
+				ina->x_host =
+					*(union ns_host *)(sc->arpcom.ac_enaddr);
+			else {
+				/* 
+				 * 
+				 */
+				bcopy((caddr_t)ina->x_host.c_host,
+				      (caddr_t)sc->arpcom.ac_enaddr,
+				      sizeof(sc->arpcom.ac_enaddr));
+			}
+			/*
+			 * Set new address
+			 */
+			el_init(ifp->if_unit);
+			break;
+		    }
+#endif
+		default:
+			el_init(ifp->if_unit);
+			break;
+		}
+		break;
+
+	case SIOCGIFADDR:
+		{
+			struct sockaddr *sa;
+			sa = (struct sockaddr *)&ifr->ifr_data;
+			bcopy((caddr_t)sc->arpcom.ac_enaddr,
+			    (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
+		}
+		break;
+
+	case SIOCSIFFLAGS:
+		/*
+		 * If interface is marked down and it is running, then stop it
+		 */
+		if (((ifp->if_flags & IFF_UP) == 0) &&
+		    (ifp->if_flags & IFF_RUNNING)) {
+			el_stop(ifp->if_unit);
+			ifp->if_flags &= ~IFF_RUNNING;
+		} else {
+		/*
+		 * If interface is marked up and it is stopped, then start it
+		 */
+			if ((ifp->if_flags & IFF_UP) &&
+		    	    ((ifp->if_flags & IFF_RUNNING) == 0))
+				el_init(ifp->if_unit);
+		}
+
+	default:
+		error = EINVAL;
+	}
+	(void) splx(s);
+	return (error);
+}
+
+/* Device timeout routine */
+void el_watchdog(int unit)
+{
+	struct el_softc *sc;
+
+	sc = &el_softc[unit];
+
+	log(LOG_ERR,"el%d: device timeout\n",unit);
+	sc->arpcom.ac_if.if_oerrors++;
+	el_reset(unit,0);
+}
+#endif