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Commit baf523c9 authored by Joe Perches's avatar Joe Perches Committed by David S. Miller
Browse files

etherdevice.h: Add ether_addr_equal_64bits 



Add an optimized boolean function to check if
2 ethernet addresses are the same.

This is to avoid any confusion about compare_ether_addr_64bits
returning an unsigned, and not being able to use the
compare_ether_addr_64bits function for sorting ala memcmp.

Signed-off-by: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2e42e474

include/linux/etherdevice.h

+20 −0
Original line number Diff line number Diff line
@@ -224,6 +224,26 @@ static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2], 
#endif

}



/**

 * ether_addr_equal_64bits - Compare two Ethernet addresses

 * @addr1: Pointer to an array of 8 bytes

 * @addr2: Pointer to an other array of 8 bytes

 *

 * Compare two ethernet addresses, returns true if equal, false otherwise.

 *

 * The function doesn't need any conditional branches and possibly uses

 * word memory accesses on CPU allowing cheap unaligned memory reads.

 * arrays = { byte1, byte2, byte3, byte4, byte6, byte7, pad1, pad2}

 *

 * Please note that alignment of addr1 & addr2 is only guaranted to be 16 bits.

 */



static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],

					   const u8 addr2[6+2])

{

	return !compare_ether_addr_64bits(addr1, addr2);

}



/**

 * is_etherdev_addr - Tell if given Ethernet address belongs to the device.

 * @dev: Pointer to a device structure