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ethersink: provide promisc and multicast functions for v6, set out queue limit to 0 on attach, add to pc64 config

--- a/sys/src/9/pc64/pc64

+++ b/sys/src/9/pc64/pc64

@@ -68,7 +68,7 @@

 #	ethervgbe	pci ethermii

 #	ethervt6102	pci ethermii

 #	ethervt6105m	pci ethermii

-#	ethersink

+	ethersink

 #	ethersmc	devi82365 cis

 	etheryuk	pci

 #	etherwavelan	wavelan devi82365 cis pci

--- a/sys/src/9/port/ethersink.c

+++ b/sys/src/9/port/ethersink.c

@@ -33,22 +33,35 @@

 }

 static void

-nop(Ether*)

+attach(Ether *ether)

 {

+	/* silently discard output */

+	qnoblock(ether->oq, 1);

+	qsetlimit(ether->oq, 0);

 }

+static void

+multicast(void *, uchar*, int)

+{

+}

+

+static void

+promiscuous(void *, int)

+{

+}

+

 static int

 reset(Ether* ether)

 {

+	static uchar zeros[Eaddrlen];

+

 	if(ether->type==nil)

 		return -1;

 	ether->mbps = 1000;

-	ether->attach = nop;

-	ether->transmit = nop;

-	ether->ifstat = nil;

+	ether->attach = attach;

+	ether->multicast = multicast;

+	ether->promiscuous = promiscuous;

 	ether->ctl = ctl;

-	ether->promiscuous = nil;

-	ether->multicast = nil;

 	ether->arg = ether;

 	return 0;

 }