Commit fd74e6cc authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
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[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
...@@ -112,7 +112,11 @@ static int br_handle_local_finish(struct sk_buff *skb) ...@@ -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;
} }
/* /*
......
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