netdev - [PATCH v3 net-next 08/15] vxlan: use exit_batch

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Message-ID: <20240205124752.811108-9-edumazet@google.com>
Date: Mon,  5 Feb 2024 12:47:45 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v3 net-next 08/15] vxlan: use exit_batch_rtnl() method

exit_batch_rtnl() is called while RTNL is held,
and devices to be unregistered can be queued in the dev_kill_list.

This saves one rtnl_lock()/rtnl_unlock() pair per netns
and one unregister_netdevice_many() call.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/vxlan/vxlan_core.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 16106e088c6301d3aaa47dd73985107945735b6e..df664de4b2b6cc361363b804e7ad531d59e2cdfa 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -4846,23 +4846,25 @@ static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
 
 }
 
-static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
+static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list,
+					     struct list_head *dev_to_kill)
 {
 	struct net *net;
-	LIST_HEAD(list);
-	unsigned int h;
 
+	ASSERT_RTNL();
 	list_for_each_entry(net, net_list, exit_list) {
 		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 
-		unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
+		__unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
+
+		vxlan_destroy_tunnels(net, dev_to_kill);
 	}
-	rtnl_lock();
-	list_for_each_entry(net, net_list, exit_list)
-		vxlan_destroy_tunnels(net, &list);
+}
 
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
+{
+	struct net *net;
+	unsigned int h;
 
 	list_for_each_entry(net, net_list, exit_list) {
 		struct vxlan_net *vn = net_generic(net, vxlan_net_id);
@@ -4875,6 +4877,7 @@ static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
 static struct pernet_operations vxlan_net_ops = {
 	.init = vxlan_init_net,
 	.exit_batch = vxlan_exit_batch_net,
+	.exit_batch_rtnl = vxlan_exit_batch_rtnl,
 	.id   = &vxlan_net_id,
 	.size = sizeof(struct vxlan_net),
 };
-- 
2.43.0.594.gd9cf4e227d-goog