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ether82563: fix multicast filter (based on openbsd em(4) driver)

--- a/sys/src/9/pc/ether82563.c

+++ b/sys/src/9/pc/ether82563.c

@@ -749,12 +749,24 @@

 	edev = arg;

 	ctlr = edev->ctlr;

-	x = addr[5]>>1;

-	if(ctlr->type == i82566)

-		x &= 31;

-	if(ctlr->type == i218)

-		x &= 15;

-	bit = ((addr[5] & 1)<<4)|(addr[4]>>4);

+	switch(ctlr->type){

+	case i82566:

+	case i82567:

+	case i82567m:

+	case i82577:

+	case i82577m:

+	case i82579:

+	case i218:

+		bit = (addr[5]<<2)|(addr[4]>>6);

+		x = (bit>>5) & 31;

+		break;

+	default:

+		bit = (addr[5]<<4)|(addr[4]>>4);

+		x = (bit>>5) & 127;

+		break;

+	}

+	bit &= 31;

+

 	/*

 	 * multiple ether addresses can hash to the same filter bit,

 	 * so it's never safe to clear a filter bit.

@@ -764,8 +776,6 @@

 	 */

 	if(on)

 		ctlr->mta[x] |= 1<<bit;

-//	else

-//		ctlr->mta[x] &= ~(1<<bit);

 	csr32w(ctlr, Mta+x*4, ctlr->mta[x]);

 }