CEPH_HAVE_FEATURE
if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) {
if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {