[INET]: Omit double hash calculations in xxx_frag_intern
Since the hash value is already calculated in xxx_find, we can
simply use it later. This is already done in netfilter code,
so make the same in ipv4 and ipv6.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 443b3f8..d12a18b 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -212,17 +212,14 @@
/* Creation primitives. */
-static struct ipq *ip_frag_intern(struct ipq *qp_in)
+static struct ipq *ip_frag_intern(struct ipq *qp_in, unsigned int hash)
{
struct ipq *qp;
#ifdef CONFIG_SMP
struct hlist_node *n;
#endif
- unsigned int hash;
write_lock(&ip4_frags.lock);
- hash = ipqhashfn(qp_in->id, qp_in->saddr, qp_in->daddr,
- qp_in->protocol);
#ifdef CONFIG_SMP
/* With SMP race we have to recheck hash table, because
* such entry could be created on other cpu, while we
@@ -257,7 +254,7 @@
}
/* Add an entry to the 'ipq' queue for a newly received IP datagram. */
-static struct ipq *ip_frag_create(struct iphdr *iph, u32 user)
+static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h)
{
struct ipq *qp;
@@ -278,7 +275,7 @@
spin_lock_init(&qp->q.lock);
atomic_set(&qp->q.refcnt, 1);
- return ip_frag_intern(qp);
+ return ip_frag_intern(qp, h);
out_nomem:
LIMIT_NETDEBUG(KERN_ERR "ip_frag_create: no memory left !\n");
@@ -313,7 +310,7 @@
}
read_unlock(&ip4_frags.lock);
- return ip_frag_create(iph, user);
+ return ip_frag_create(iph, user, hash);
}
/* Is the fragment too far ahead to be part of ipq? */