Function ibv_reg_mr_iova 

pub unsafe extern "C" fn ibv_reg_mr_iova(
    pd: *mut ibv_pd,
    addr: *mut c_void,
    length: usize,
    iova: u64,
    access: c_int,
) -> *mut ibv_mr

ibv_reg_mr_iova - Register a memory region with a virtual offset address