OCELOT_SHORT_PREFIX_LEN
maxlen += OCELOT_SHORT_PREFIX_LEN;
max_mtu -= OCELOT_SHORT_PREFIX_LEN;
#define OCELOT_TOTAL_TAG_LEN (OCELOT_SHORT_PREFIX_LEN + OCELOT_TAG_LEN)
prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);