REAL_RX_BUF_SIZE
cmdsts = REAL_RX_BUF_SIZE | CMDSTS_INTR;
buf = dma_map_single(&dev->pci_dev->dev, skb->data, REAL_RX_BUF_SIZE,
skb = __netdev_alloc_skb(ndev, REAL_RX_BUF_SIZE+16, gfp);