net/mlx5: E-switch, When eswitch is unsupported, return -EOPNOTSUPP

When eswitch is unsupported, currently -EPERM error code is returned
instead of -EOPNOTSUPP.

Due to this VF device's devlink virtual port is not enumerated because
port_function_get() callback returned -EPERM instead of -EOPNOTSUPP.

Hence, return the error code -EOPNOTSUPP when eswitch is unsupported.

Fixes: bd939753 ("net/mlx5: E-switch, Introduce and use eswitch support check helper")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -69,7 +69,7 @@ static int mlx5_eswitch_check(const struct mlx5_core_dev *dev)
 		return -EOPNOTSUPP;
 
 	if (!MLX5_ESWITCH_MANAGER(dev))
-		return -EPERM;
+		return -EOPNOTSUPP;
 
 	return 0;
 }