net/mlx5e: Enable local loopback in loopback selftest

Before running the ethtool's loopback selftest, we need
to make sure that the local loopback is enabled.
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c

@@ -189,6 +189,7 @@ struct mlx5e_lbt_priv {
 	struct packet_type pt;
 	struct completion comp;
 	bool loopback_ok;
+	bool local_lb;
 };
 
 static int
@@ -236,6 +237,13 @@ static int mlx5e_test_loopback_setup(struct mlx5e_priv *priv,
 {
 	int err = 0;
 
+	/* Temporarily enable local_lb */
+	if (MLX5_CAP_GEN(priv->mdev, disable_local_lb)) {
+		mlx5_nic_vport_query_local_lb(priv->mdev, &lbtp->local_lb);
+		if (!lbtp->local_lb)
+			mlx5_nic_vport_update_local_lb(priv->mdev, true);
+	}
+
 	err = mlx5e_refresh_tirs(priv, true);
 	if (err)
 		return err;
@@ -254,6 +262,11 @@ static int mlx5e_test_loopback_setup(struct mlx5e_priv *priv,
 static void mlx5e_test_loopback_cleanup(struct mlx5e_priv *priv,
 					struct mlx5e_lbt_priv *lbtp)
 {
+	if (MLX5_CAP_GEN(priv->mdev, disable_local_lb)) {
+		if (!lbtp->local_lb)
+			mlx5_nic_vport_update_local_lb(priv->mdev, false);
+	}
+
 	dev_remove_pack(&lbtp->pt);
 	mlx5e_refresh_tirs(priv, false);
 }