RXSTART_INIT
return (ptr + RSV_SIZE) - (RXEND_INIT - RXSTART_INIT + 1);
nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT);
nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT);
erxrdpt = erxrdpt_workaround(next_packet, RXSTART_INIT, RXEND_INIT);