plan 9 kernel history: overview | file list | diff list

1997/0408/pc/devether.c (diff list | history)

1997/0408/sys/src/9/pc/devether.c:1,407 – 1997/0415/sys/src/9/pc/devether.c:1,429 (short | long | prev | next)
1992/0403    
#include "u.h" 
#include "../port/lib.h" 
#include "mem.h" 
#include "dat.h" 
#include "fns.h" 
#include "io.h"
1993/1113    
#include "ureg.h" 
#include "../port/error.h" 
#include "../port/netif.h"
1992/0403    
1993/1113    
#include "etherif.h"
1992/1222    
1997/0327    
static Ether *etherxx[MaxEther];
1992/0403    
1993/1113    
Chan*
1997/0327    
etherattach(char* spec)
1993/1113    
{ 
	ulong ctlrno; 
	char *p;
1997/0327    
	Chan *chan;
1992/0404    
1993/1113    
	ctlrno = 0; 
	if(spec && *spec){ 
		ctlrno = strtoul(spec, &p, 0); 
		if((ctlrno == 0 && p == spec) || *p || (ctlrno >= MaxEther)) 
			error(Ebadarg); 
	}
1997/0327    
	if(etherxx[ctlrno] == 0)
1993/1113    
		error(Enodev);
1992/0403    
1997/0327    
	chan = devattach('l', spec); 
	chan->dev = ctlrno; 
	if(etherxx[ctlrno]->attach) 
		etherxx[ctlrno]->attach(etherxx[ctlrno]); 
	return chan;
1993/1113    
}
1992/0922    
1997/0327    
static int 
etherwalk(Chan* chan, char* name)
1992/0411    
{
1997/0327    
	return netifwalk(etherxx[chan->dev], chan, name);
1992/0424    
}
1992/0411    
1997/0327    
static void 
etherstat(Chan* chan, char* dp)
1992/0424    
{
1997/0327    
	netifstat(etherxx[chan->dev], chan, dp);
1992/0424    
}
1997/0327    
static Chan* 
etheropen(Chan* chan, int omode)
1992/0424    
{
1997/0327    
	return netifopen(etherxx[chan->dev], chan, omode);
1992/0424    
}
1997/0327    
static void
1995/0726    
ethercreate(Chan*, char*, int, ulong)
1992/0424    
{ 
}
1997/0327    
static void 
etherclose(Chan* chan)
1992/0424    
{
1997/0327    
	netifclose(etherxx[chan->dev], chan);
1992/0424    
}
1997/0327    
static long 
etherread(Chan* chan, void* buf, long n, ulong offset)
1992/0424    
{
1997/0327    
	Ether *ether;
1996/0607    
1997/0327    
	ether = etherxx[chan->dev]; 
	if((chan->qid.path & CHDIR) == 0 && ether->ifstat){
1996/0607    
		/* 
		 * With some controllers it is necessary to reach 
		 * into the chip to extract statistics. 
		 */
1997/0327    
		if(NETTYPE(chan->qid.path) == Nifstatqid) 
			return ether->ifstat(ether, buf, n, offset); 
		else if(NETTYPE(chan->qid.path) == Nstatqid) 
			ether->ifstat(ether, buf, 0, offset);
1996/0607    
	}
1997/0327    
	return netifread(ether, chan, buf, n, offset);
1992/0411    
}
1997/0327    
static Block* 
etherbread(Chan* chan, long n, ulong offset)
1995/0108    
{
1997/0327    
	return netifbread(etherxx[chan->dev], chan, n, offset);
1995/0108    
}
1997/0327    
static void
1995/0822    
etherremove(Chan*)
1992/0424    
{ 
}
1997/0327    
static void 
etherwstat(Chan* chan, char* dp)
1992/0424    
{
1997/0327    
	netifwstat(etherxx[chan->dev], chan, dp);
1992/0424    
}
1997/0327    
static void 
etherrtrace(Netfile* f, Etherpkt* pkt, int len)
1993/1120    
{
1997/0327    
	int i, n;
1995/0713    
	Block *bp;
1997/0327    
 
	if(qwindow(f->in) <= 0) 
		return; 
	if(len > 64) 
		n = 64; 
	else 
		n = len; 
	bp = iallocb(n); 
	if(bp == 0) 
		return; 
	memmove(bp->wp, pkt->d, n); 
	i = TK2MS(m->ticks); 
	bp->wp[58] = len>>8; 
	bp->wp[59] = len; 
	bp->wp[60] = i>>24; 
	bp->wp[61] = i>>16; 
	bp->wp[62] = i>>8; 
	bp->wp[63] = i; 
	bp->wp += 64; 
	qpass(f->in, bp); 
} 
 
Block* 
etheriq(Ether* ether, Block* bp, int freebp) 
{ 
	Etherpkt *pkt;
1993/1120    
	ushort type;
1997/0327    
	int len; 
	Netfile **ep, *f, **fp, *fx; 
	Block *xbp;
1993/1120    
1997/0327    
	ether->inpackets++; 
 
	pkt = (Etherpkt*)bp->rp; 
	len = BLEN(bp);
1993/1120    
	type = (pkt->type[0]<<8)|pkt->type[1];
1997/0327    
	fx = 0; 
	ep = ðer->f[Ntypes];
1997/0404    
	/* check for valid multcast addresses */ 
	if((pkt->d[0] & 1) && memcmp(pkt->d, ether->bcast, sizeof(pkt->d)) != 0 && ether->prom == 0){ 
		if(!activemulti(ether, pkt->d, sizeof(pkt->d))){ 
			if(freebp){ 
				freeb(bp); 
				bp = 0; 
			} 
			return bp; 
		} 
	}
1997/0327    
	/* 
	 * Multiplex the packet to all the connections which want it. 
	 * If the packet is not to be used subsequently (freebp != 0), 
	 * attempt to simply pass it into one of the connections, thereby 
	 * saving a copy of the data (usual case hopefully). 
	 */ 
	for(fp = ether->f; fp < ep; fp++){
1995/0721    
		if((f = *fp) && (f->type == type || f->type < 0)){
1995/0713    
			if(f->type > -2){
1997/0327    
				if(freebp && fx == 0) 
					fx = f; 
				else if(xbp = iallocb(len)){ 
					memmove(xbp->wp, pkt, len); 
					xbp->wp += len; 
					qpass(f->in, xbp); 
				}
1995/0801    
				else
1997/0327    
					ether->soverflows++;
1995/0713    
			}
1997/0327    
			else 
				etherrtrace(f, pkt, len);
1995/0713    
		}
1993/1120    
	}
1997/0327    
 
	if(fx){ 
		qpass(fx->in, bp); 
		return 0; 
	} 
	if(freebp){ 
		freeb(bp); 
		return 0; 
	} 
 
	return bp;
1993/1120    
} 
 
static int
1997/0327    
etheroq(Ether* ether, Block* bp)
1993/1120    
{
1997/0327    
	int len, loopback, s; 
	Etherpkt *pkt;
1993/1120    
1997/0327    
	ether->outpackets++;
1993/1120    
1997/0327    
	/* 
	 * Check if the packet has to be placed back onto the input queue, 
	 * i.e. if it's a loopback or broadcast packet or the interface is 
	 * in promiscuous mode. 
	 * If it's a loopback packet indicate to etheriq that the data isn't 
	 * needed and return, etheriq will pass-on or free the block. 
	 */ 
	pkt = (Etherpkt*)bp->rp; 
	len = BLEN(bp); 
	loopback = !memcmp(pkt->d, ether->ea, sizeof(pkt->d)); 
	if(loopback || !memcmp(pkt->d, ether->bcast, sizeof(pkt->d)) || ether->prom){ 
		s = splhi(); 
		etheriq(ether, bp, loopback); 
		splx(s); 
	}
1994/0702    
1997/0327    
	if(!loopback){ 
		qbwrite(ether->oq, bp); 
		ether->transmit(ether); 
	} 
 
	return len;
1993/1120    
}
1997/0327    
static long 
etherwrite(Chan* chan, void* buf, long n, ulong)
1992/0407    
{
1997/0327    
	Ether *ether; 
	Block *bp;
1992/0407    
1993/1113    
	if(n > ETHERMAXTU) 
		error(Ebadarg);
1992/0407    
1997/0327    
	ether = etherxx[chan->dev]; 
	if(NETTYPE(chan->qid.path) != Ndataqid) 
		return netifwrite(ether, chan, buf, n);
1992/0403    
1997/0327    
	bp = allocb(n);
1992/0403    
	if(waserror()){
1997/0327    
		freeb(bp);
1992/0403    
		nexterror(); 
	}
1997/0327    
	memmove(bp->rp, buf, n); 
	memmove(bp->rp+Eaddrlen, ether->ea, Eaddrlen);
1995/0822    
	poperror();
1997/0327    
	bp->wp += n;
1992/0403    
1997/0327    
	return etheroq(ether, bp);
1995/0108    
}
1997/0327    
static long 
etherbwrite(Chan* chan, Block* bp, ulong)
1995/0108    
{
1997/0327    
	Ether *ether; 
	long n; 
 
	n = BLEN(bp); 
	if(n > ETHERMAXTU){ 
		freeb(bp); 
		error(Ebadarg); 
	} 
 
	ether = etherxx[chan->dev]; 
	if(NETTYPE(chan->qid.path) != Ndataqid){ 
		n = netifwrite(ether, chan, bp->rp, n); 
		freeb(bp); 
		return n; 
	} 
 
	return etheroq(ether, bp);
1992/0403    
}
1993/1113    
static struct {
1997/0327    
	char*	type;
1993/1113    
	int	(*reset)(Ether*);
1993/1119    
} cards[MaxEther+1];
1992/0403    
1993/1113    
void
1997/0327    
addethercard(char* t, int (*r)(Ether*))
1992/0403    
{
1993/1113    
	static int ncard;
1992/0403    
1993/1119    
	if(ncard == MaxEther)
1993/1113    
		panic("too many ether cards"); 
	cards[ncard].type = t; 
	cards[ncard].reset = r; 
	ncard++;
1992/0403    
}
1997/0327    
int 
parseether(uchar *to, char *from) 
{ 
	char nip[4]; 
	char *p; 
	int i; 
 
	p = from; 
	for(i = 0; i < 6; i++){ 
		if(*p == 0) 
			return -1; 
		nip[0] = *p++; 
		if(*p == 0) 
			return -1; 
		nip[1] = *p++; 
		nip[2] = 0; 
		to[i] = strtoul(nip, 0, 16); 
		if(*p == ':') 
			p++; 
	} 
	return 0; 
} 
 
static void
1992/0424    
etherreset(void) 
{
1997/0327    
	Ether *ether;
1993/1113    
	int i, n, ctlrno;
1997/0327    
	char name[NAMELEN], buf[128];
1992/0410    
1997/0327    
	for(ether = 0, ctlrno = 0; ctlrno < MaxEther; ctlrno++){ 
		if(ether == 0) 
			ether = malloc(sizeof(Ether)); 
		memset(ether, 0, sizeof(Ether)); 
		ether->ctlrno = ctlrno; 
		ether->tbdf = BUSUNKNOWN; 
		ether->mbps = 10; 
		if(isaconfig("ether", ctlrno, ether) == 0)
1993/1113    
			continue; 
		for(n = 0; cards[n].type; n++){
1997/0327    
			if(cistrcmp(cards[n].type, ether->type))
1993/1113    
				continue;
1997/0327    
			for(i = 0; i < ether->nopt; i++){ 
				if(strncmp(ether->opt[i], "ea=", 3)) 
					continue; 
				if(parseether(ether->ea, ðer->opt[i][3]) == -1) 
					memset(ether->ea, 0, Eaddrlen); 
			}	 
			if(cards[n].reset(ether))
1993/1113    
				break;
1992/1222    
 
			/* 
			 * IRQ2 doesn't really exist, it's used to gang the interrupt 
			 * controllers together. A device set to IRQ2 will appear on 
			 * the second interrupt controller as IRQ9. 
			 */
1997/0327    
			if(ether->irq == 2) 
				ether->irq = 9; 
			intrenable(VectorPIC+ether->irq, ether->interrupt, ether, ether->tbdf);
1993/0212    
1997/0327    
			i = sprint(buf, "#l%d: %s: %dMbps port 0x%luX irq %d", 
				ctlrno, ether->type, ether->mbps, ether->port, ether->irq); 
			if(ether->mem) 
				i += sprint(buf+i, " addr 0x%luX", ether->mem & ~KZERO); 
			if(ether->size) 
				i += sprint(buf+i, " size 0x%luX", ether->size); 
			i += sprint(buf+i, ": %2.2uX%2.2uX%2.2uX%2.2uX%2.2uX%2.2uX", 
				ether->ea[0], ether->ea[1], ether->ea[2], 
				ether->ea[3], ether->ea[4], ether->ea[5]); 
			sprint(buf+i, "\n"); 
			print(buf);
1993/0212    
1997/0327    
			snprint(name, sizeof(name), "ether%d", ctlrno); 
			if(ether->mbps == 100){ 
				netifinit(ether, name, Ntypes, 256*1024); 
				if(ether->oq == 0) 
					ether->oq = qopen(256*1024, 1, 0, 0); 
			} 
			else{ 
				netifinit(ether, name, Ntypes, 32*1024); 
				if(ether->oq == 0) 
					ether->oq = qopen(64*1024, 1, 0, 0); 
			} 
			ether->alen = Eaddrlen; 
			memmove(ether->addr, ether->ea, Eaddrlen); 
			memset(ether->bcast, 0xFF, Eaddrlen);
1992/0410    
1997/0327    
			etherxx[ctlrno] = ether; 
			ether = 0;
1993/1120    
			break;
1993/1113    
		}
1992/0403    
	}
1997/0327    
	if(ether) 
		free(ether);
1992/0403    
}
1997/0327    
1997/0415    
#define POLY 0xedb88320 
 
/* really slow 32 bit crc for ethers */ 
ulong 
ethercrc(uchar *p, int len) 
{ 
	int i, j; 
	ulong crc, b; 
 
	crc = 0xffffffff; 
	for(i = 0; i < len; i++){ 
		b = *p++; 
		for(j = 0; j < 8; j++){ 
			crc = (crc>>1); 
			if((crc^b) & 1) 
				crc ^= POLY; 
			b >>= 1; 
		} 
	} 
	return crc; 
}
1997/0327    
Dev etherdevtab = {
1997/0408    
	'l', 
	"ether",
1997/0327    
	etherreset, 
	devinit, 
	etherattach, 
	devclone, 
	etherwalk, 
	etherstat, 
	etheropen, 
	ethercreate, 
	etherclose, 
	etherread, 
	etherbread, 
	etherwrite, 
	etherbwrite, 
	etherremove, 
	etherwstat, 
};


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Plan 9 distribution
comments to russ cox (rsc@swtch.com)