A5PSW_TAG_LEN
#define A5PSW_EXTRA_MTU_LEN (A5PSW_TAG_LEN + 8)
.needed_headroom = A5PSW_TAG_LEN,
BUILD_BUG_ON(sizeof(*ptag) != A5PSW_TAG_LEN);
skb_push(skb, A5PSW_TAG_LEN);
dsa_alloc_etype_header(skb, A5PSW_TAG_LEN);
if (unlikely(!pskb_may_pull(skb, A5PSW_TAG_LEN))) {
skb_pull_rcsum(skb, A5PSW_TAG_LEN);
dsa_strip_etype_header(skb, A5PSW_TAG_LEN);