From 7750b036d8196bfdc4f117a84ac4822e8fb03a5b Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Fri, 5 Jul 2019 10:16:19 -0700 Subject: [PATCH] net: speedup ethernet address comparison with bitops Using bit operations like or and xor is faster than a loop on all architectures. Really just explicit unrolling. Similar cast to uint16 unaligned is already done in other functions here. Signed-off-by: Stephen Hemminger Reviewed-by: Andrew Rybchenko Acked-by: Olivier Matz --- lib/librte_net/rte_ether.h | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/lib/librte_net/rte_ether.h b/lib/librte_net/rte_ether.h index c4ff4cd8d3..8ac1afecc8 100644 --- a/lib/librte_net/rte_ether.h +++ b/lib/librte_net/rte_ether.h @@ -81,11 +81,10 @@ struct rte_ether_addr { static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1, const struct rte_ether_addr *ea2) { - int i; - for (i = 0; i < RTE_ETHER_ADDR_LEN; i++) - if (ea1->addr_bytes[i] != ea2->addr_bytes[i]) - return 0; - return 1; + const unaligned_uint16_t *w1 = (const uint16_t *)ea1; + const unaligned_uint16_t *w2 = (const uint16_t *)ea2; + + return ((w1[0] ^ w2[0]) | (w1[1] ^ w2[1]) | (w1[2] ^ w2[2])) == 0; } /** @@ -100,11 +99,9 @@ static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1, */ static inline int rte_is_zero_ether_addr(const struct rte_ether_addr *ea) { - int i; - for (i = 0; i < RTE_ETHER_ADDR_LEN; i++) - if (ea->addr_bytes[i] != 0x00) - return 0; - return 1; + const unaligned_uint16_t *w = (const uint16_t *)ea; + + return (w[0] | w[1] | w[2]) == 0; } /** -- 2.20.1