diff options
| author |   Alexander Duyck <alexander.h.duyck@redhat.com> | 2015-04-30 14:53:54 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-05-03 22:30:36 -0400 |
| commit | d54385ce68cd18ab002b46f61246ad197cec92de (patch) | |
| tree | 402dda30a5d94d0519d62ac25c03b3c32d08a188 /include/linux/etherdevice.h | |
| parent | etherdev: Avoid unnecessary byte swap in check for Ethertype (diff) | |
| download | wireguard-linux-d54385ce68cd18ab002b46f61246ad197cec92de.tar.xz wireguard-linux-d54385ce68cd18ab002b46f61246ad197cec92de.zip | |
etherdev: Process is_multicast_ether_addr at same size as other operations
This change makes it so that we process the address in
is_multicast_ether_addr at the same size as the other calls. This allows
us to avoid duplicate reads when used with other calls such as
is_zero_ether_addr or eth_addr_copy. In addition I have added a 64 bit
version of the function so in eth_type_trans we can process the destination
address as a 64 bit value throughout.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/etherdevice.h')
| -rw-r--r-- | include/linux/etherdevice.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 606563ef8a72..c4a10f991fe0 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -110,7 +110,29 @@ static inline bool is_zero_ether_addr(const u8 *addr) */ static inline bool is_multicast_ether_addr(const u8 *addr) { - return 0x01 & addr[0]; +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) + u32 a = *(const u32 *)addr; +#else + u16 a = *(const u16 *)addr; +#endif +#ifdef __BIG_ENDIAN + return 0x01 & (a >> ((sizeof(a) * 8) - 8)); +#else + return 0x01 & a; +#endif +} + +static inline bool is_multicast_ether_addr_64bits(const u8 addr[6+2]) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 +#ifdef __BIG_ENDIAN + return 0x01 & ((*(const u64 *)addr) >> 56); +#else + return 0x01 & (*(const u64 *)addr); +#endif +#else + return is_multicast_ether_addr(addr); +#endif } /** |