[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: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ip_fragment.c

@@ -212,17 +212,14 @@ static void ip_expire(unsigned long arg)
 
 /* 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 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
 }
 
 /* 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 @@ static struct ipq *ip_frag_create(struct iphdr *iph, u32 user)
 	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 @@ static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
 	}
 	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? */

net/ipv6/reassembly.c

@@ -233,16 +233,15 @@ static void ip6_frag_expire(unsigned long data)
 /* Creation primitives. */
 
 
-static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in)
+static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in,
+		unsigned int hash)
 {
 	struct frag_queue *fq;
-	unsigned int hash;
 #ifdef CONFIG_SMP
 	struct hlist_node *n;
 #endif
 
 	write_lock(&ip6_frags.lock);
-	hash = ip6qhashfn(fq_in->id, &fq_in->saddr, &fq_in->daddr);
 #ifdef CONFIG_SMP
 	hlist_for_each_entry(fq, n, &ip6_frags.hash[hash], q.list) {
 		if (fq->id == fq_in->id &&
@@ -273,7 +272,7 @@ static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in)
 
 static struct frag_queue *
 ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
-		struct inet6_dev *idev)
+		struct inet6_dev *idev, unsigned int hash)
 {
 	struct frag_queue *fq;
 
@@ -290,7 +289,7 @@ ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
 	spin_lock_init(&fq->q.lock);
 	atomic_set(&fq->q.refcnt, 1);
 
-	return ip6_frag_intern(fq);
+	return ip6_frag_intern(fq, hash);
 
 oom:
 	IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS);
@@ -318,7 +317,7 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
 	}
 	read_unlock(&ip6_frags.lock);
 
-	return ip6_frag_create(id, src, dst, idev);
+	return ip6_frag_create(id, src, dst, idev, hash);
 }