etherdevice: Optimize a few is_<foo>_ether_addr functions (2c722fe1) · Commits · 戴 / test

include/linux/etherdevice.h

+23 −2

Original line number	Diff line number	Diff line
		@@ -61,6 +61,8 @@ static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
		*
		* Return true if address is link local reserved addr (01:80:c2:00:00:0X) per
		* IEEE 802.1Q 8.6.3 Frame filtering.
		*
		* Please note: addr must be aligned to u16.
		*/
		static inline bool is_link_local_ether_addr(const u8 *addr)
		{
		@@ -68,7 +70,12 @@ static inline bool is_link_local_ether_addr(const u8 *addr)
		static const __be16 b = (const __be16 )eth_reserved_addr_base;
		static const __be16 m = cpu_to_be16(0xfff0);

		#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
		return ((((const u32 )addr) ^ ((const u32 )b)) \|
		((a[2] ^ b[2]) & m)) == 0;
		#else
		return ((a[0] ^ b[0]) \| (a[1] ^ b[1]) \| ((a[2] ^ b[2]) & m)) == 0;
		#endif
		}

		/**
		@@ -76,10 +83,18 @@ static inline bool is_link_local_ether_addr(const u8 *addr)
		* @addr: Pointer to a six-byte array containing the Ethernet address
		*
		* Return true if the address is all zeroes.
		*
		* Please note: addr must be aligned to u16.
		*/
		static inline bool is_zero_ether_addr(const u8 *addr)
		{
		return !(addr[0] \| addr[1] \| addr[2] \| addr[3] \| addr[4] \| addr[5]);
		#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
		return (((const u32 )addr) \| ((const u16 )(addr + 4))) == 0;
		#else
		return ((const u16 )(addr + 0) \|
		(const u16 )(addr + 2) \|
		(const u16 )(addr + 4)) == 0;
		#endif
		}

		/**
		@@ -110,10 +125,14 @@ static inline bool is_local_ether_addr(const u8 *addr)
		* @addr: Pointer to a six-byte array containing the Ethernet address
		*
		* Return true if the address is the broadcast address.
		*
		* Please note: addr must be aligned to u16.
		*/
		static inline bool is_broadcast_ether_addr(const u8 *addr)
		{
		return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
		return ((const u16 )(addr + 0) &
		(const u16 )(addr + 2) &
		(const u16 )(addr + 4)) == 0xffff;
		}

		/**
		@@ -135,6 +154,8 @@ static inline bool is_unicast_ether_addr(const u8 *addr)
		* a multicast address, and is not FF:FF:FF:FF:FF:FF.
		*
		* Return true if the address is valid.
		*
		* Please note: addr must be aligned to u16.
		*/
		static inline bool is_valid_ether_addr(const u8 *addr)
		{

Admin message