mlx5e_get_linear_rq_headroom
headroom = mlx5e_get_linear_rq_headroom(params, NULL);
u16 linear_headroom = mlx5e_get_linear_rq_headroom(params, rqo);
headroom = mlx5e_get_linear_rq_headroom(params, rqo);
u16 mlx5e_get_linear_rq_headroom(struct mlx5e_params *params,
int hr = mlx5e_get_linear_rq_headroom(params, rqo);
u32 hr = mlx5e_get_linear_rq_headroom(new_params, &rqo);