IOC3_DMA_XFER_LEN
return (~addr + 1) & (IOC3_DMA_XFER_LEN - 1UL);
new_skb = alloc_skb(RX_BUF_SIZE + IOC3_DMA_XFER_LEN - 1, GFP_ATOMIC);
#define RX_BUF_SIZE (13 * IOC3_DMA_XFER_LEN)