net/mlx5e: Fix devlink port register sequence

If udevd is configured to rename interfaces according to persistent
naming rules and if a network interface has phys_port_name in sysfs,
its contents will be appended to the interface name.
However, register_netdev creates device in sysfs and if
devlink_port_register is called after that, there is a timeframe in
which udevd may read an empty phys_port_name value. The consequence is
that the interface will lose this suffix and its name will not be
really persistent.

The solution is to register the port before registering a netdev.

Fixes: c6acd629eec7 ("net/mlx5e: Add support for devlink-port in non-representors mode")
Signed-off-by: Vladyslav Tarasiuk <vladyslavt@mellanox.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c
index e38495e..f8b2de4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c
@@ -3,20 +3,14 @@
 
 #include "en/devlink.h"
 
-int mlx5e_devlink_port_register(struct net_device *netdev)
+int mlx5e_devlink_port_register(struct mlx5e_priv *priv)
 {
-       struct mlx5_core_dev *dev;
-       struct mlx5e_priv *priv;
-       struct devlink *devlink;
-       int err;
+       struct devlink *devlink = priv_to_devlink(priv->mdev);
 
-       priv = netdev_priv(netdev);
-       dev = priv->mdev;
-
-       if (mlx5_core_is_pf(dev))
+       if (mlx5_core_is_pf(priv->mdev))
                devlink_port_attrs_set(&priv->dl_port,
                                       DEVLINK_PORT_FLAVOUR_PHYSICAL,
-                                      PCI_FUNC(dev->pdev->devfn),
+                                      PCI_FUNC(priv->mdev->pdev->devfn),
                                       false, 0,
                                       NULL, 0);
        else
@@ -24,12 +18,12 @@ int mlx5e_devlink_port_register(struct net_device *netdev)
                                       DEVLINK_PORT_FLAVOUR_VIRTUAL,
                                       0, false, 0, NULL, 0);
 
-       devlink = priv_to_devlink(dev);
-       err = devlink_port_register(devlink, &priv->dl_port, 1);
-       if (err)
-               return err;
-       devlink_port_type_eth_set(&priv->dl_port, netdev);
-       return 0;
+       return devlink_port_register(devlink, &priv->dl_port, 1);
+}
+
+void mlx5e_devlink_port_type_eth_set(struct mlx5e_priv *priv)
+{
+       devlink_port_type_eth_set(&priv->dl_port, priv->netdev);
 }
 
 void mlx5e_devlink_port_unregister(struct mlx5e_priv *priv)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.h b/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.h
index 3e5393a..83123a8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.h
@@ -7,8 +7,9 @@
 #include <net/devlink.h>
 #include "en.h"
 
-int mlx5e_devlink_port_register(struct net_device *dev);
+int mlx5e_devlink_port_register(struct mlx5e_priv *priv);
 void mlx5e_devlink_port_unregister(struct mlx5e_priv *priv);
+void mlx5e_devlink_port_type_eth_set(struct mlx5e_priv *priv);
 struct devlink_port *mlx5e_get_devlink_port(struct net_device *dev);
 
 #endif

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index f9c928a..be20d22 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -5467,25 +5467,27 @@ static void *mlx5e_add(struct mlx5_core_dev *mdev)
                goto err_destroy_netdev;
        }
 
-       err = register_netdev(netdev);
+       err = mlx5e_devlink_port_register(priv);
        if (err) {
-               mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
+               mlx5_core_err(mdev, "mlx5e_devlink_port_register failed, %d\n", err);
                goto err_detach;
        }
 
-       err = mlx5e_devlink_port_register(netdev);
+       err = register_netdev(netdev);
        if (err) {
-               mlx5_core_err(mdev, "mlx5e_devlink_phy_port_register failed, %d\n", err);
-               goto err_unregister_netdev;
+               mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
+               goto err_devlink_port_unregister;
        }
 
+       mlx5e_devlink_port_type_eth_set(priv);
+
 #ifdef CONFIG_MLX5_CORE_EN_DCB
        mlx5e_dcbnl_init_app(priv);
 #endif
        return priv;
 
-err_unregister_netdev:
-       unregister_netdev(netdev);
+err_devlink_port_unregister:
+       mlx5e_devlink_port_unregister(priv);
 err_detach:
        mlx5e_detach(mdev, priv);
 err_destroy_netdev: