netdev - [PATCH net v2 05/11] net/mlx5e: use netdev_lockdep_set

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Message-ID: <20250327135659.2057487-6-sdf@fomichev.me>
Date: Thu, 27 Mar 2025 06:56:53 -0700
From: Stanislav Fomichev <sdf@...ichev.me>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	Cosmin Ratiu <cratiu@...dia.com>
Subject: [PATCH net v2 05/11] net/mlx5e: use netdev_lockdep_set_classes

Cosmin reports a potential recursive lock warning in [0]. mlx5 is
using register_netdevice_notifier_dev_net which might result in
iteration over entire netns which triggers lock ordering issues.
We know that lower devices are independent, so it's save to
suppress the lockdep.

0: https://lore.kernel.org/netdev/672305efd02d3d29520f49a1c18e2f4da6e90902.camel@nvidia.com/

Reported-by: Cosmin Ratiu <cratiu@...dia.com>
Signed-off-by: Stanislav Fomichev <sdf@...ichev.me>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 3506024c2453..e3d8d6c9bf03 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -40,6 +40,7 @@
 #include <linux/if_bridge.h>
 #include <linux/filter.h>
 #include <net/netdev_queues.h>
+#include <net/netdev_lock.h>
 #include <net/page_pool/types.h>
 #include <net/pkt_sched.h>
 #include <net/xdp_sock_drv.h>
@@ -5454,6 +5455,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 	netdev->netdev_ops = &mlx5e_netdev_ops;
 	netdev->xdp_metadata_ops = &mlx5e_xdp_metadata_ops;
 	netdev->xsk_tx_metadata_ops = &mlx5e_xsk_tx_metadata_ops;
+	netdev_lockdep_set_classes(netdev);
 
 	mlx5e_dcbnl_build_netdev(netdev);
 
-- 
2.48.1