ipvs: batch __ip_vs_cleanup

It's better to batch __ip_vs_cleanup to speedup ipvs
connections dismantle.
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -1324,7 +1324,7 @@ void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
-void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
+void ip_vs_service_nets_cleanup(struct list_head *net_list);
 
 /* IPVS application functions
  * (from ip_vs_app.c)

net/netfilter/ipvs/ip_vs_core.c

@@ -2402,18 +2402,22 @@ static int __net_init __ip_vs_init(struct net *net)
 	return -ENOMEM;
 }
 
-static void __net_exit __ip_vs_cleanup(struct net *net)
+static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
 {
-	struct netns_ipvs *ipvs = net_ipvs(net);
-
-	ip_vs_service_net_cleanup(ipvs);	/* ip_vs_flush() with locks */
-	ip_vs_conn_net_cleanup(ipvs);
-	ip_vs_app_net_cleanup(ipvs);
-	ip_vs_protocol_net_cleanup(ipvs);
-	ip_vs_control_net_cleanup(ipvs);
-	ip_vs_estimator_net_cleanup(ipvs);
-	IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
-	net->ipvs = NULL;
+	struct netns_ipvs *ipvs;
+	struct net *net;
+
+	ip_vs_service_nets_cleanup(net_list);	/* ip_vs_flush() with locks */
+	list_for_each_entry(net, net_list, exit_list) {
+		ipvs = net_ipvs(net);
+		ip_vs_conn_net_cleanup(ipvs);
+		ip_vs_app_net_cleanup(ipvs);
+		ip_vs_protocol_net_cleanup(ipvs);
+		ip_vs_control_net_cleanup(ipvs);
+		ip_vs_estimator_net_cleanup(ipvs);
+		IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
+		net->ipvs = NULL;
+	}
 }
 
 static int __net_init __ip_vs_dev_init(struct net *net)
@@ -2442,7 +2446,7 @@ static void __net_exit __ip_vs_dev_cleanup(struct net *net)
 
 static struct pernet_operations ipvs_core_ops = {
 	.init = __ip_vs_init,
-	.exit = __ip_vs_cleanup,
+	.exit_batch = __ip_vs_cleanup_batch,
 	.id   = &ip_vs_net_id,
 	.size = sizeof(struct netns_ipvs),
 };

net/netfilter/ipvs/ip_vs_ctl.c

@@ -1607,14 +1607,20 @@ static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
 
 /*
  *	Delete service by {netns} in the service table.
- *	Called by __ip_vs_cleanup()
+ *	Called by __ip_vs_batch_cleanup()
  */
-void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs)
+void ip_vs_service_nets_cleanup(struct list_head *net_list)
 {
+	struct netns_ipvs *ipvs;
+	struct net *net;
+
 	EnterFunction(2);
 	/* Check for "full" addressed entries */
 	mutex_lock(&__ip_vs_mutex);
-	ip_vs_flush(ipvs, true);
+	list_for_each_entry(net, net_list, exit_list) {
+		ipvs = net_ipvs(net);
+		ip_vs_flush(ipvs, true);
+	}
 	mutex_unlock(&__ip_vs_mutex);
 	LeaveFunction(2);
 }