MDP_HDR_LEN
#define MAMAC_DATA_LEN (1024 - MDP_HDR_LEN)
skb = dev_alloc_skb(len - MDP_HDR_LEN + 2 * ETH_ALEN + 2);
buf += MDP_HDR_LEN;
len -= MDP_HDR_LEN;
return (len > MDP_HDR_LEN &&
unsigned int mdp_len = payload_len + MDP_HDR_LEN;