Phonet: put sockets in a hash table

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/phonet/phonet.h

@@ -46,6 +46,7 @@ static inline struct pn_sock *pn_sk(struct sock *sk)
 
 extern const struct proto_ops phonet_dgram_ops;
 
+void pn_sock_init(void);
 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
 void phonet_get_local_port_range(int *min, int *max);

net/phonet/af_phonet.c

@@ -481,6 +481,7 @@ static int __init phonet_init(void)
 	if (err)
 		return err;
 
+	pn_sock_init();
 	err = sock_register(&phonet_proto_family);
 	if (err) {
 		printk(KERN_ALERT

net/phonet/socket.c

@@ -45,13 +45,28 @@ static int pn_socket_release(struct socket *sock)
 	return 0;
 }
 
+#define PN_HASHSIZE	16
+#define PN_HASHMASK	(PN_HASHSIZE-1)
+
+
 static struct  {
-	struct hlist_head hlist;
+	struct hlist_head hlist[PN_HASHSIZE];
 	spinlock_t lock;
-} pnsocks = {
-	.hlist = HLIST_HEAD_INIT,
-	.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
-};
+} pnsocks;
+
+void __init pn_sock_init(void)
+{
+	unsigned i;
+
+	for (i = 0; i < PN_HASHSIZE; i++)
+		INIT_HLIST_HEAD(pnsocks.hlist + i);
+	spin_lock_init(&pnsocks.lock);
+}
+
+static struct hlist_head *pn_hash_list(u16 obj)
+{
+	return pnsocks.hlist + (obj & PN_HASHMASK);
+}
 
 /*
  * Find address based on socket address, match only certain fields.
@@ -64,10 +79,11 @@ struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
 	struct sock *rval = NULL;
 	u16 obj = pn_sockaddr_get_object(spn);
 	u8 res = spn->spn_resource;
+	struct hlist_head *hlist = pn_hash_list(obj);
 
 	spin_lock_bh(&pnsocks.lock);
 
-	sk_for_each(sknode, node, &pnsocks.hlist) {
+	sk_for_each(sknode, node, hlist) {
 		struct pn_sock *pn = pn_sk(sknode);
 		BUG_ON(!pn->sobject); /* unbound socket */
 
@@ -99,11 +115,15 @@ struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
 /* Deliver a broadcast packet (only in bottom-half) */
 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
 {
+	struct hlist_head *hlist = pnsocks.hlist;
+	unsigned h;
+
+	spin_lock(&pnsocks.lock);
+	for (h = 0; h < PN_HASHSIZE; h++) {
 		struct hlist_node *node;
 		struct sock *sknode;
 
-	spin_lock(&pnsocks.lock);
-	sk_for_each(sknode, node, &pnsocks.hlist) {
+		sk_for_each(sknode, node, hlist) {
 			struct sk_buff *clone;
 
 			if (!net_eq(sock_net(sknode), net))
@@ -117,13 +137,17 @@ void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
 				sk_receive_skb(sknode, clone, 0);
 			}
 		}
+		hlist++;
+	}
 	spin_unlock(&pnsocks.lock);
 }
 
 void pn_sock_hash(struct sock *sk)
 {
+	struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
+
 	spin_lock_bh(&pnsocks.lock);
-	sk_add_node(sk, &pnsocks.hlist);
+	sk_add_node(sk, hlist);
 	spin_unlock_bh(&pnsocks.lock);
 }
 EXPORT_SYMBOL(pn_sock_hash);
@@ -439,16 +463,21 @@ EXPORT_SYMBOL(pn_sock_get_port);
 static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
 {
 	struct net *net = seq_file_net(seq);
+	struct hlist_head *hlist = pnsocks.hlist;
 	struct hlist_node *node;
 	struct sock *sknode;
+	unsigned h;
 
-	sk_for_each(sknode, node, &pnsocks.hlist) {
+	for (h = 0; h < PN_HASHSIZE; h++) {
+		sk_for_each(sknode, node, hlist) {
 			if (!net_eq(net, sock_net(sknode)))
 				continue;
 			if (!pos)
 				return sknode;
 			pos--;
 		}
+		hlist++;
+	}
 	return NULL;
 }