lowb
while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
int status = lowb(priv->rx_ring[entry]->RMD1);
if (lowb(priv->rx_ring[(entry + i) % RX_RING_SIZE]->RMD1) & RF_OWN)
int status = lowb(priv->tx_ring[entry]->TMD1);
if (lowb(priv->tx_ring[(entry + 1) % TX_RING_SIZE]->TMD1) != 0) {