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etherdevice.h: Add ether_addr_equal_64bits

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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: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joe Perches 2012-05-09 17:04:03 +00:00 committed by David S. Miller
parent 2e42e4747e
commit baf523c9ba
1 changed files with 20 additions and 0 deletions
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20
include/linux/etherdevice.h
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@ -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