Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-01 17:51:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

[NETFILTER]: nf_conntrack: avoid duplicate protocol comparison in nf_ct_tuple_equal()

Browse Source 
nf_ct_tuple_src_equal() and nf_ct_tuple_dst_equal() both compare the protocol
numbers. Unfortunately gcc doesn't optimize out the second comparison, so
remove it and prefix both functions with __ to indicate that they should not
be used directly.

Saves another 16 byte of text in __nf_conntrack_find() on x86_64:

  nf_conntrack_tuple_taken |  -20 # 320 -> 300, size inlines: 181 -> 161
  __nf_conntrack_find      |  -16 # 267 -> 251, size inlines: 127 -> 115
  __nf_conntrack_confirm   |  -40 # 875 -> 835, size inlines: 570 -> 537
 3 functions changed, 76 bytes removed

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-31 04:40:04 -08:00 committed by David S. Miller
parent ba419aff2c
commit 380517dead
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/net/netfilter/nf_conntrack_tuple.h
View File

@ -132,34 +132,33 @@ struct nf_conntrack_tuple_hash
#endif /* __KERNEL__ */
static inline int nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
static inline int __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return (t1->src.u3.all[0] == t2->src.u3.all[0] &&
t1->src.u3.all[1] == t2->src.u3.all[1] &&
t1->src.u3.all[2] == t2->src.u3.all[2] &&
t1->src.u3.all[3] == t2->src.u3.all[3] &&
t1->src.u.all == t2->src.u.all &&
t1->src.l3num == t2->src.l3num &&
t1->dst.protonum == t2->dst.protonum);
t1->src.l3num == t2->src.l3num);
}
static inline int nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
static inline int __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
t1->dst.u.all == t2->dst.u.all &&
t1->src.l3num == t2->src.l3num &&
t1->dst.protonum == t2->dst.protonum);
}
static inline int nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
const struct nf_conntrack_tuple *t2)
{
return nf_ct_tuple_src_equal(t1, t2) && nf_ct_tuple_dst_equal(t1, t2);
return __nf_ct_tuple_src_equal(t1, t2) &&
__nf_ct_tuple_dst_equal(t1, t2);
}
static inline int nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
@ -199,7 +198,7 @@ static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
const struct nf_conntrack_tuple_mask *mask)
{
return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
nf_ct_tuple_dst_equal(t, tuple);
__nf_ct_tuple_dst_equal(t, tuple);
}
#endif /* _NF_CONNTRACK_TUPLE_H */