netdev - [net-next 09/14] net/mlx5e: Fix devlink port register sequence

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Date:   Tue, 17 Mar 2020 19:47:17 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        Vladyslav Tarasiuk <vladyslavt@...lanox.com>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 09/14] net/mlx5e: Fix devlink port register sequence

From: Vladyslav Tarasiuk <vladyslavt@...lanox.com>

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@...lanox.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 .../ethernet/mellanox/mlx5/core/en/devlink.c  | 26 +++++++------------
 .../ethernet/mellanox/mlx5/core/en/devlink.h  |  3 ++-
 .../net/ethernet/mellanox/mlx5/core/en_main.c | 16 +++++++-----
 3 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/en/devlink.c
index e38495e4aa42..f8b2de4b04be 100644
--- 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 3e5393a0901f..83123a801adc 100644
--- 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 f9c928afec89..be20d2247594 100644
--- 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:
-- 
2.24.1