Function rdmaxcel_create_devx_dmabuf_mr 

pub unsafe extern "C" fn rdmaxcel_create_devx_dmabuf_mr(
    pd: *mut ibv_pd,
    access_flags: c_int,
    addr: usize,
    length: usize,
    page_shift: u8,
    mkey: *mut *mut rdmaxcel_devx_mkey_t,
) -> c_int