setup_base_pdu
setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum);
setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);
setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, urb_p->seqnum);
setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum);