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Commit fd74e6cc authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[BRIDGE]: faster compare for link local addresses 



Use logic operations rather than memcmp() to compare destination
address with link local multicast addresses.

Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eddc9ec5

net/bridge/br_input.c

+5 −1
Original line number Original line Diff line number Diff line
@@ -112,7 +112,11 @@ static int br_handle_local_finish(struct sk_buff *skb) 
 */

 */

static inline int is_link_local(const unsigned char *dest)

static inline int is_link_local(const unsigned char *dest)

{

{

	return memcmp(dest, br_group_address, 5) == 0 && (dest[5] & 0xf0) == 0;

	const u16 *a = (const u16 *) dest;

	static const u16 *const b = (const u16 *const ) br_group_address;

	static const u16 m = __constant_cpu_to_be16(0xfff0);



	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;

}

}





/*

/*