[ETH]: ether address compare

Expose faster ether compare for use by protocols and other
driver. And change name to be more consistent with other ether
address manipulation routines in same file
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

include/linux/etherdevice.h

@@ -104,6 +104,22 @@ static inline void random_ether_addr(u8 *addr)
 	addr [0] &= 0xfe;	/* clear multicast bit */
 	addr [0] |= 0x02;	/* set local assignment bit (IEEE802) */
 }
+
+/**
+ * compare_ether_addr - Compare two Ethernet addresses
+ * @addr1: Pointer to a six-byte array containing the Ethernet address
+ * @addr2 Pointer other six-byte array containing the Ethernet address
+ *
+ * Compare two ethernet addresses, returns 0 if equal
+ */
+static inline unsigned compare_ether_addr(const u8 *_a, const u8 *_b)
+{
+	const u16 *a = (const u16 *) _a;
+	const u16 *b = (const u16 *) _b;
+
+	BUILD_BUG_ON(ETH_ALEN != 6);
+	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
+}
 #endif	/* __KERNEL__ */
 
 #endif	/* _LINUX_ETHERDEVICE_H */

net/ethernet/eth.c

@@ -146,19 +146,6 @@ int eth_rebuild_header(struct sk_buff *skb)
 	return 0;
 }
 
-static inline unsigned int compare_eth_addr(const unsigned char *__a, const unsigned char *__b)
-{
-	const unsigned short *dest = (unsigned short *) __a;
-	const unsigned short *devaddr = (unsigned short *) __b;
-	unsigned int res;
-
-	BUILD_BUG_ON(ETH_ALEN != 6);
-	res = ((dest[0] ^ devaddr[0]) |
-	       (dest[1] ^ devaddr[1]) |
-	       (dest[2] ^ devaddr[2])) != 0;
-
-	return res;
-}
 
 /*
  *	Determine the packet's protocol ID. The rule here is that we 
@@ -176,7 +163,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	eth = eth_hdr(skb);
 	
 	if (*eth->h_dest&1) {
-		if (!compare_eth_addr(eth->h_dest, dev->broadcast))
+		if (!compare_ether_addr(eth->h_dest, dev->broadcast))
 			skb->pkt_type = PACKET_BROADCAST;
 		else
 			skb->pkt_type = PACKET_MULTICAST;
@@ -191,7 +178,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	 */
 	 
 	else if(1 /*dev->flags&IFF_PROMISC*/) {
-		if (unlikely(compare_eth_addr(eth->h_dest, dev->dev_addr)))
+		if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
 			skb->pkt_type = PACKET_OTHERHOST;
 	}