Revert "RDMA/mlx5: Fix devlink deadlock on net namespace deletion"

This reverts commit fbdd0049d98d44914fc57d4b91f867f4996c787b.

Due to commit in fixes tag, netdevice events were received only in one net
namespace of mlx5_core_dev. Due to this when netdevice events arrive in
net namespace other than net namespace of mlx5_core_dev, they are missed.

This results in empty GID table due to RDMA device being detached from its
net device.

Hence, revert back to receive netdevice events in all net namespaces to
restore back RDMA functionality in non init_net net namespace. The
deadlock will have to be addressed in another patch.

Fixes: fbdd0049d98d ("RDMA/mlx5: Fix devlink deadlock on net namespace deletion")
Link: https://lore.kernel.org/r/20210117092633.10690-1-leon@kernel.org
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index d26f3f3e0462a03e8cc38058124add5bcb0f86d8..aabdc07e475374fbe591fa15a42a0e20b931c497 100644 (file)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -3311,8 +3311,7 @@ static int mlx5_add_netdev_notifier(struct mlx5_ib_dev *dev, u8 port_num)
        int err;
 
        dev->port[port_num].roce.nb.notifier_call = mlx5_netdev_event;
-       err = register_netdevice_notifier_net(mlx5_core_net(dev->mdev),
-                                             &dev->port[port_num].roce.nb);
+       err = register_netdevice_notifier(&dev->port[port_num].roce.nb);
        if (err) {
                dev->port[port_num].roce.nb.notifier_call = NULL;
                return err;
@@ -3324,8 +3323,7 @@ static int mlx5_add_netdev_notifier(struct mlx5_ib_dev *dev, u8 port_num)
 static void mlx5_remove_netdev_notifier(struct mlx5_ib_dev *dev, u8 port_num)
 {
        if (dev->port[port_num].roce.nb.notifier_call) {
-               unregister_netdevice_notifier_net(mlx5_core_net(dev->mdev),
-                                                 &dev->port[port_num].roce.nb);
+               unregister_netdevice_notifier(&dev->port[port_num].roce.nb);
                dev->port[port_num].roce.nb.notifier_call = NULL;
        }
 }

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
index 3a9fa629503f0e0eb889ae0e4b79dc05eafee79e..d046db7bb047d5f9fc9dc59b415bef0a53efb356 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
@@ -90,4 +90,9 @@ int mlx5_create_encryption_key(struct mlx5_core_dev *mdev,
                               u32 key_type, u32 *p_key_id);
 void mlx5_destroy_encryption_key(struct mlx5_core_dev *mdev, u32 key_id);
 
+static inline struct net *mlx5_core_net(struct mlx5_core_dev *dev)
+{
+       return devlink_net(priv_to_devlink(dev));
+}
+
 #endif

diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index f93bfe7473aa7c15e3da3630fffd5786bf21ed3f..4672e12f1aa52cfb7daa2a87824e9715247d36fd 100644 (file)
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1209,22 +1209,4 @@ static inline bool mlx5_is_roce_enabled(struct mlx5_core_dev *dev)
        return val.vbool;
 }
 
-/**
- * mlx5_core_net - Provide net namespace of the mlx5_core_dev
- * @dev: mlx5 core device
- *
- * mlx5_core_net() returns the net namespace of mlx5 core device.
- * This can be called only in below described limited context.
- * (a) When a devlink instance for mlx5_core is registered and
- *     when devlink reload operation is disabled.
- *     or
- * (b) during devlink reload reload_down() and reload_up callbacks
- *     where it is ensured that devlink instance's net namespace is
- *     stable.
- */
-static inline struct net *mlx5_core_net(struct mlx5_core_dev *dev)
-{
-       return devlink_net(priv_to_devlink(dev));
-}
-
 #endif /* MLX5_DRIVER_H */