hw_index_to_key
*lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
mr->key = hw_index_to_key(mridx);
mw->key = hw_index_to_key(index);
mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);