RX_NIC_BUFSIZE
static unsigned char txb[TX_RING * RX_NIC_BUFSIZE];
static unsigned char rxb[RX_RING * RX_NIC_BUFSIZE];
virt_to_le32desc(&rxb[i * RX_NIC_BUFSIZE]);
rx_ring[i].Length = cpu_to_le16(RX_NIC_BUFSIZE);
(i * RX_NIC_BUFSIZE), nic->packetlen);
ptxb = txb + (nr * RX_NIC_BUFSIZE);