netdev - [PATCH v3 net-next 05/15] geneve: use exit_batch

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Message-ID: <20240205124752.811108-6-edumazet@google.com>
Date: Mon,  5 Feb 2024 12:47:42 +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 05/15] geneve: 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,
and one unregister_netdevice_many() call.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/geneve.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 32c51c244153bd760b9f58001906c04c8b0f37ff..f31fc52ef397dfe0eba854385f783fbcad7e870f 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1900,18 +1900,13 @@ static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
 	}
 }
 
-static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
+static void __net_exit geneve_exit_batch_rtnl(struct list_head *net_list,
+					      struct list_head *dev_to_kill)
 {
 	struct net *net;
-	LIST_HEAD(list);
 
-	rtnl_lock();
 	list_for_each_entry(net, net_list, exit_list)
-		geneve_destroy_tunnels(net, &list);
-
-	/* unregister the devices gathered above */
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+		geneve_destroy_tunnels(net, dev_to_kill);
 
 	list_for_each_entry(net, net_list, exit_list) {
 		const struct geneve_net *gn = net_generic(net, geneve_net_id);
@@ -1922,7 +1917,7 @@ static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
 
 static struct pernet_operations geneve_net_ops = {
 	.init = geneve_init_net,
-	.exit_batch = geneve_exit_batch_net,
+	.exit_batch_rtnl = geneve_exit_batch_rtnl,
 	.id   = &geneve_net_id,
 	.size = sizeof(struct geneve_net),
 };
-- 
2.43.0.594.gd9cf4e227d-goog