Added a fast ethernet address comparison function for 64-bit CPU architectures without strict alignment requirements, loading the ethernet addresses as 64-bit words and comparing the relevant 6 bytes.
Signed-off-by: Morten Brørup <[email protected]> --- lib/net/rte_ether.h | 46 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/lib/net/rte_ether.h b/lib/net/rte_ether.h index 5552d3c1f6..1b640d81c2 100644 --- a/lib/net/rte_ether.h +++ b/lib/net/rte_ether.h @@ -114,6 +114,52 @@ static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1, #endif } +/** + * @warning + * @b EXPERIMENTAL: this API may change, or be removed, without prior notice + * + * Check if two Ethernet addresses are the same, performance optimized. + * + * @warning + * Intentional buffer overrun: + * The Ethernet addresses are loaded as 64-bit integers, i.e. + * two bytes past the memory holding the Ethernet addresses are loaded. + * The caller must ensure that this does not cause problems. + * If an Ethernet address 'ea' is a field in a structure 'S', it can be verified as follows: + * \code{.c} + * static_assert(sizeof(struct S) >= offsetof(struct S, ea) + sizeof(uint64_t)); + * \endcode + * + * @param ea1 + * A pointer to the first ether_addr structure containing the Ethernet address. + * @param ea2 + * A pointer to the second ether_addr structure containing the Ethernet address. + * + * @return + * - true if the given two Ethernet addresses are the same; + * - false otherwise. + */ +__rte_experimental +__rte_pure +static inline bool +rte_is_same_ether_addr_fast(const struct rte_ether_addr *ea1, + const struct rte_ether_addr *ea2) +{ +#if defined(RTE_ARCH_64) && !defined(RTE_ARCH_STRICT_ALIGN) + const unaligned_uint64_t * const a1 = (const unaligned_uint64_t *)ea1; + const unaligned_uint64_t * const a2 = (const unaligned_uint64_t *)ea2; +#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN + return (*a1 ^ *a2) >> 16 == 0; +#elif RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN + return (*a1 ^ *a2) << 16 == 0; +#else +#error "Unknown byte order." +#endif /* RTE_BYTE_ORDER */ +#else + return rte_is_same_ether_addr(ea1, ea2); +#endif +} + /** * Check if an Ethernet address is filled with zeros. * -- 2.43.0
