def vhost_scsi_controller_add_target(client, ctrlr, scsi_target_num, bdev_name):
    """Add LUN to vhost scsi controller target.
    Args:
        ctrlr: controller name
        scsi_target_num: target number to use
        bdev_name: name of bdev to add to target
    """
    params = {
        'ctrlr': ctrlr,
        'scsi_target_num': scsi_target_num,
        'bdev_name': bdev_name,
    }
    return client.call('vhost_scsi_controller_add_target', params)