Commit c44f5faa8e8c2036da2ba656f79b57a737543aff
1 parent
5861811549
Exists in
smarc-l5.0.0_1.0.0-ga
and in
5 other branches
netfilter: xt_HMARK: modulus is expensive for hash calculation
Use: ((u64)(HASH_VAL * HASH_SIZE)) >> 32 as suggested by David S. Miller. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff
net/netfilter/xt_HMARK.c
| ... | ... | @@ -109,7 +109,7 @@ |
| 109 | 109 | hash = jhash_3words(t->src, t->dst, t->uports.v32, info->hashrnd); |
| 110 | 110 | hash = hash ^ (t->proto & info->proto_mask); |
| 111 | 111 | |
| 112 | - return (hash % info->hmodulus) + info->hoffset; | |
| 112 | + return (((u64)hash * info->hmodulus) >> 32) + info->hoffset; | |
| 113 | 113 | } |
| 114 | 114 | |
| 115 | 115 | static void |