BGMAC_RX_FRAME_OFFSET
ctl |= BGMAC_RX_FRAME_OFFSET << BGMAC_DMA_RX_FRAME_OFFSET_SHIFT;
skb_put(skb, BGMAC_RX_FRAME_OFFSET +
skb_pull(skb, BGMAC_RX_FRAME_OFFSET +
BGMAC_RX_FRAME_OFFSET)
#define BGMAC_RX_BUF_SIZE (BGMAC_RX_FRAME_OFFSET + BGMAC_RX_MAX_FRAME_SIZE)