mlx5_get_fdb_sub_ns
root_ns = mlx5_get_fdb_sub_ns(dev, 0);
root_ns = mlx5_get_fdb_sub_ns(dev, 0);
EXPORT_SYMBOL(mlx5_get_fdb_sub_ns);
mlx5_get_fdb_sub_ns(chains->dev, chain) :
mlx5_get_fdb_sub_ns(struct mlx5_core_dev *dev, int n);