MAC_MAX_FRAME_SIZE
writel_relaxed(MAC_MAX_FRAME_SIZE, priv->base + CONTROL_WORD);
u32 len = MAC_MAX_FRAME_SIZE;
dma_unmap_single(priv->dev, addr, MAC_MAX_FRAME_SIZE,
if (skb->len > MAC_MAX_FRAME_SIZE) {
MAC_MAX_FRAME_SIZE, DMA_FROM_DEVICE);