[rds-devel] [PATCH 14/19] Add infrastructure for TCP statistics per network namespace.

[Jie Liu]

- Introduce percpu tcp stats to netns_rds.
- init/free tcp stats per netns.

Signed-off-by: Jie Liu <jeff.liu at oracle.com>
---
 include/net/netns/rds.h |    3 +++
 net/rds/tcp.c           |    7 +++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/net/netns/rds.h b/include/net/netns/rds.h
index 78918fa..2662b87 100644
--- a/include/net/netns/rds.h
+++ b/include/net/netns/rds.h
@@ -36,10 +36,13 @@ struct netns_rds {
 	/* track rds_tcp_connection structs so they can be cleaned up */
 	struct list_head rds_tcp_conn_list;
 	spinlock_t rds_tcp_conn_lock;
+
 	/* exporting info */
 	struct list_head rds_tcp_tc_list;
 	spinlock_t rds_tcp_tc_list_lock;
 	unsigned int rds_tcp_tc_count;
+
+	struct rds_tcp_statistics __percpu *rds_tcp_stats;
 #endif
 
 	/* global statistics */
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 7a49899..5c543b7 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -257,12 +257,18 @@ static int __net_init rds_tcp_pernet_init(struct net *net)
 	INIT_LIST_HEAD(&net->rds.rds_tcp_conn_list);
 	spin_lock_init(&net->rds.rds_tcp_conn_lock);
 
+	net->rds.rds_tcp_stats = alloc_percpu(struct rds_tcp_statistics);
+	if (!net->rds.rds_tcp_stats)
+		return -ENOMEM;
+
 	return 0;
 }
 
 static void __net_exit rds_tcp_pernet_exit(struct net *net)
 {
 	rds_tcp_destroy_conns(net);
+	free_percpu(net->rds.rds_tcp_stats);
+	net->rds.rds_tcp_stats = NULL;
 }
 
 static struct pernet_operations __net_initdata rds_tcp_net_ops = {
@@ -284,6 +290,7 @@ static void rds_tcp_exit(void)
 {
 	rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
 	rds_tcp_listen_stop();
+	rds_tcp_net_exit();
 	rds_trans_unregister(&rds_tcp_transport);
 	rds_tcp_recv_exit();
 	kmem_cache_destroy(rds_tcp_conn_slab);
-- 
1.7.4.1