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nusb/ether: tune buffer size parameters for SMSC ethernet (raspi) (thanks richard miller)

--- a/sys/src/cmd/nusb/ether/smsc.c

+++ b/sys/src/cmd/nusb/ether/smsc.c

@@ -14,10 +14,9 @@

 	Resettime	= 1000,

 	E2pbusytime	= 1000,

 	Afcdefault	= 0xF830A1,

-//	Hsburst		= 37,	/* from original linux driver */

-	Hsburst		= 8,

+	Hsburst		= 24,

 	Fsburst		= 129,

-	Defbulkdly	= 0x2000,

+	Defbulkdly	= 1000,

 	Ethp8021q	= 0x8100,

 	MACoffset 	= 1,

@@ -211,11 +210,9 @@

 	uint hd;

 	int n;

-	if(Doburst)

-		b = allocb(Hsburst*512);

-	else

-		b = allocb(Maxpkt+4);

-	if((n = read(ep->dfd, b->wp, b->lim - b->base)) < 0){

+	n = Doburst? Hsburst*512 : Maxpkt+4;

+	b = allocb(n);

+	if((n = read(ep->dfd, b->wp, n)) < 0){

 		freeb(b);

 		return -1;

 	}