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| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2011-11-22 06:46:02 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-11-22 15:27:18 -0500 |
| commit | 26bff940dd975499c6c47438d4395d7d215911e8 (patch) | |
| tree | 7b6774138e3033d7ab6df080419740083caee2ae /include/net | |
| parent | net: add documentation for net_prio cgroups (v4) (diff) | |
| download | linux-dev-26bff940dd975499c6c47438d4395d7d215911e8.tar.xz linux-dev-26bff940dd975499c6c47438d4395d7d215911e8.zip | |
xfrm: optimize ipv4 selector matching
Current addr_match() is errh, under-optimized.
Compiler doesn't know that memcmp() branch doesn't trigger for IPv4.
Also, pass addresses by value -- they fit into register.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/xfrm.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index b203e14d26b7..4de7ed9016d9 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -827,6 +827,14 @@ static inline bool addr_match(const void *token1, const void *token2, return true; } +static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) +{ + /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ + if (prefixlen == 0) + return true; + return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); +} + static __inline__ __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) { |