TxIntrUploaded
vp->tx_ring[entry].status = cpu_to_le32(skb->len | TxIntrUploaded);
vp->tx_ring[entry].status = cpu_to_le32(skb->len | TxIntrUploaded | AddTCPChksum | AddUDPChksum);
vp->tx_ring[entry].status = cpu_to_le32(skb->len | TxIntrUploaded);
prev_entry->status &= cpu_to_le32(~TxIntrUploaded);