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>
git-mirror · May 16, 2012 · c44f5fa · c44f5fa
1 parent 5861811
commit c44f5fa
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/net/netfilter/xt_HMARK.c b/net/netfilter/xt_HMARK.c
@@ -109,7 +109,7 @@ hmark_hash(struct hmark_tuple *t, const struct xt_hmark_info *info)
 	hash = jhash_3words(t->src, t->dst, t->uports.v32, info->hashrnd);
 	hash = hash ^ (t->proto & info->proto_mask);
 
-	return (hash % info->hmodulus) + info->hoffset;
+	return (((u64)hash * info->hmodulus) >> 32) + info->hoffset;
 }
 
 static void