cma_set_qkey
ret = cma_set_qkey(id_priv, rep->qkey);
ret = cma_set_qkey(id_priv, qkey);
status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
ret = cma_set_qkey(id_priv, 0);
ret = cma_set_qkey(id_priv, 0);