mr_driver
#define mri_driver mr_driver
rv = ring->mr_start(ring->mr_driver, ring->mr_gen_num);
ring->mr_stop(ring->mr_driver);
ring->mr_driver, ring->mr_type);
ring->mr_driver, ring->mr_type);
ring->mr_driver, ring->mr_type);
ring->mr_stat(ring->mr_driver, stat, &val);
ring->mr_stat(ring->mr_driver, stat, &val);