netdev - [PATCH v1 net-next 1/3] pfcp: Convert pfcp_net_exit() to ->exit_batch

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Message-ID: <20250214081818.81658-2-kuniyu@amazon.com>
Date: Fri, 14 Feb 2025 17:18:16 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
	<horms@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 1/3] pfcp: Convert pfcp_net_exit() to ->exit_batch_rtnl().

pfcp_net_exit() holds RTNL and calls unregister_netdevice_queue() for
dev in the netns.

Let's convert pfcp_net_exit() to ->exit_batch_rtnl to save RTNL dances
for each netns.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 drivers/net/pfcp.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/net/pfcp.c b/drivers/net/pfcp.c
index 68d0d9e92a22..5cb8635ada20 100644
--- a/drivers/net/pfcp.c
+++ b/drivers/net/pfcp.c
@@ -244,30 +244,35 @@ static int __net_init pfcp_net_init(struct net *net)
 	return 0;
 }
 
-static void __net_exit pfcp_net_exit(struct net *net)
+static void __net_exit pfcp_destroy_links(struct net *net,
+					  struct list_head *dev_kill_list)
 {
 	struct pfcp_net *pn = net_generic(net, pfcp_net_id);
 	struct pfcp_dev *pfcp, *pfcp_next;
 	struct net_device *dev;
-	LIST_HEAD(list);
 
-	rtnl_lock();
 	for_each_netdev(net, dev)
 		if (dev->rtnl_link_ops == &pfcp_link_ops)
-			pfcp_dellink(dev, &list);
+			pfcp_dellink(dev, dev_kill_list);
 
 	list_for_each_entry_safe(pfcp, pfcp_next, &pn->pfcp_dev_list, list)
-		pfcp_dellink(pfcp->dev, &list);
+		pfcp_dellink(pfcp->dev, dev_kill_list);
+}
+
+static void __net_exit pfcp_net_exit_batch_rtnl(struct list_head *net_exit_list,
+						struct list_head *dev_kill_list)
+{
+	struct net *net;
 
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+	list_for_each_entry(net, net_exit_list, exit_list)
+		pfcp_destroy_links(net, dev_kill_list);
 }
 
 static struct pernet_operations pfcp_net_ops = {
-	.init	= pfcp_net_init,
-	.exit	= pfcp_net_exit,
-	.id	= &pfcp_net_id,
-	.size	= sizeof(struct pfcp_net),
+	.init = pfcp_net_init,
+	.exit_batch_rtnl = pfcp_net_exit_batch_rtnl,
+	.id = &pfcp_net_id,
+	.size = sizeof(struct pfcp_net),
 };
 
 static int __init pfcp_init(void)
-- 
2.39.5 (Apple Git-154)