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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2011-11-22 06:46:02 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-22 20:27:18 (GMT) |
| commit | 26bff940dd975499c6c47438d4395d7d215911e8 (patch) | |
| tree | 7b6774138e3033d7ab6df080419740083caee2ae | |
| parent | 3ee32fee65ef6a4a8a4188e913be7dd90ba9e058 (diff) | |
| download | linux-26bff940dd975499c6c47438d4395d7d215911e8.tar.xz | |
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>
| -rw-r--r-- | include/net/xfrm.h | 8 | ||||
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 4 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index b203e14..4de7ed9 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) { diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 552df27..593c8a1 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -61,8 +61,8 @@ __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) { const struct flowi4 *fl4 = &fl->u.ip4; - return addr_match(&fl4->daddr, &sel->daddr, sel->prefixlen_d) && - addr_match(&fl4->saddr, &sel->saddr, sel->prefixlen_s) && + return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && + addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && (fl4->flowi4_proto == sel->proto || !sel->proto) && |