RUN_MAX_RXSZ
usbd_setup_xfer(xfer, sc->rxq.pipeh, data, data->buf, RUN_MAX_RXSZ,
RUN_MAX_RXSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY,
data->buf = usbd_alloc_buffer(data->xfer, RUN_MAX_RXSZ);