[PATCH 2/2] packet: convert socket list to RCU

[Stephen Hemminger]

Convert AF_PACKET to use RCU, eliminating one more reader/writer lock.

I needed to create some minor additional socket list RCU infrastructure
to make this work. Note: there is no need for a real sk_del_node_init_rcu(), 
because sk_del_node_init is doing the equivalent thing to 
hlst_del_init_rcu already; but added some comments to try and make that obvious.

Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxxxx>

---
 include/net/netns/packet.h |    4 ++--
 include/net/sock.h         |   10 ++++++++++
 net/packet/af_packet.c     |   42 ++++++++++++++++++++----------------------
 3 files changed, 32 insertions(+), 24 deletions(-)

--- a/include/net/netns/packet.h	2010-02-18 15:08:59.532872158 -0800
+++ b/include/net/netns/packet.h	2010-02-18 15:09:16.433496523 -0800
@@ -4,11 +4,11 @@
 #ifndef __NETNS_PACKET_H__
 #define __NETNS_PACKET_H__
 
-#include <linux/list.h>
+#include <linux/rculist.h>
 #include <linux/spinlock.h>
 
 struct netns_packet {
-	rwlock_t		sklist_lock;
+	spinlock_t		sklist_lock;
 	struct hlist_head	sklist;
 };
 
--- a/net/packet/af_packet.c	2010-02-18 15:08:59.520873035 -0800
+++ b/net/packet/af_packet.c	2010-02-18 15:10:33.908871539 -0800
@@ -1262,18 +1262,15 @@ static int packet_release(struct socket 
 	net = sock_net(sk);
 	po = pkt_sk(sk);
 
-	write_lock_bh(&net->packet.sklist_lock);
-	sk_del_node_init(sk);
+	spin_lock_bh(&net->packet.sklist_lock);
+	sk_del_node_init_rcu(sk);
 	sock_prot_inuse_add(net, sk->sk_prot, -1);
-	write_unlock_bh(&net->packet.sklist_lock);
-
-	/*
-	 *	Unhook packet receive handler.
-	 */
+	spin_unlock_bh(&net->packet.sklist_lock);
 
 	if (po->running) {
 		/*
-		 *	Remove the protocol hook
+		 * Remove from protocol table
+		 *  does synchronize_net()
 		 */
 		dev_remove_pack(&po->prot_hook);
 		po->running = 0;
@@ -1478,10 +1475,11 @@ static int packet_create(struct net *net
 		po->running = 1;
 	}
 
-	write_lock_bh(&net->packet.sklist_lock);
-	sk_add_node(sk, &net->packet.sklist);
+	spin_lock_bh(&net->packet.sklist_lock);
+	sk_add_node_rcu(sk, &net->packet.sklist);
 	sock_prot_inuse_add(net, &packet_proto, 1);
-	write_unlock_bh(&net->packet.sklist_lock);
+	spin_unlock_bh(&net->packet.sklist_lock);
+
 	return 0;
 out:
 	return err;
@@ -2075,8 +2073,8 @@ static int packet_notifier(struct notifi
 	struct net_device *dev = data;
 	struct net *net = dev_net(dev);
 
-	read_lock(&net->packet.sklist_lock);
-	sk_for_each(sk, node, &net->packet.sklist) {
+	rcu_read_lock();
+	sk_for_each_rcu(sk, node, &net->packet.sklist) {
 		struct packet_sock *po = pkt_sk(sk);
 
 		switch (msg) {
@@ -2115,7 +2113,7 @@ static int packet_notifier(struct notifi
 			break;
 		}
 	}
-	read_unlock(&net->packet.sklist_lock);
+	rcu_read_unlock();
 	return NOTIFY_DONE;
 }
 
@@ -2512,24 +2510,24 @@ static struct notifier_block packet_netd
 #ifdef CONFIG_PROC_FS
 
 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
-	__acquires(seq_file_net(seq)->packet.sklist_lock)
+	__acquires(RCU)
 {
 	struct net *net = seq_file_net(seq);
-	read_lock(&net->packet.sklist_lock);
-	return seq_hlist_start_head(&net->packet.sklist, *pos);
+
+	rcu_read_lock();
+	return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
 }
 
 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct net *net = seq_file_net(seq);
-	return seq_hlist_next(v, &net->packet.sklist, pos);
+	return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
 }
 
 static void packet_seq_stop(struct seq_file *seq, void *v)
-	__releases(seq_file_net(seq)->packet.sklist_lock)
+	__releases(RCU)
 {
-	struct net *net = seq_file_net(seq);
-	read_unlock(&net->packet.sklist_lock);
+	rcu_read_unlock();
 }
 
 static int packet_seq_show(struct seq_file *seq, void *v)
@@ -2581,7 +2579,7 @@ static const struct file_operations pack
 
 static int __net_init packet_net_init(struct net *net)
 {
-	rwlock_init(&net->packet.sklist_lock);
+	spin_lock_init(&net->packet.sklist_lock);
 	INIT_HLIST_HEAD(&net->packet.sklist);
 
 	if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
--- a/include/net/sock.h	2010-02-18 15:08:59.548872240 -0800
+++ b/include/net/sock.h	2010-02-18 15:09:16.437496392 -0800
@@ -381,6 +381,7 @@ static __inline__ void __sk_del_node(str
 	__hlist_del(&sk->sk_node);
 }
 
+/* NB: equivalent to hlist_del_init_rcu */
 static __inline__ int __sk_del_node_init(struct sock *sk)
 {
 	if (sk_hashed(sk)) {
@@ -421,6 +422,7 @@ static __inline__ int sk_del_node_init(s
 	}
 	return rc;
 }
+#define sk_del_node_init_rcu(sk)	sk_del_node_init(sk)
 
 static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk)
 {
@@ -454,6 +456,12 @@ static __inline__ void sk_add_node(struc
 	__sk_add_node(sk, list);
 }
 
+static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
+{
+	sock_hold(sk);
+	hlist_add_head_rcu(&sk->sk_node, list);
+}
+
 static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
 {
 	hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
@@ -478,6 +486,8 @@ static __inline__ void sk_add_bind_node(
 
 #define sk_for_each(__sk, node, list) \
 	hlist_for_each_entry(__sk, node, list, sk_node)
+#define sk_for_each_rcu(__sk, node, list) \
+	hlist_for_each_entry_rcu(__sk, node, list, sk_node)
 #define sk_nulls_for_each(__sk, node, list) \
 	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
 #define sk_nulls_for_each_rcu(__sk, node, list) \

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