RT2573_RX_DESC_SIZE
if (len < RT2573_RX_DESC_SIZE) {
len -= RT2573_RX_DESC_SIZE;
usbd_copy_out(pc, 0, &sc->sc_rx_desc, RT2573_RX_DESC_SIZE);
usbd_copy_out(pc, RT2573_RX_DESC_SIZE,
.bufsize = (MCLBYTES + RT2573_RX_DESC_SIZE),