GSW1XX_HEADER_LEN
skb_pull_rcsum(skb, GSW1XX_HEADER_LEN);
dsa_strip_etype_header(skb, GSW1XX_HEADER_LEN);
.needed_headroom = GSW1XX_HEADER_LEN,
skb_push(skb, GSW1XX_HEADER_LEN);
dsa_alloc_etype_header(skb, GSW1XX_HEADER_LEN);
if (unlikely(!pskb_may_pull(skb, GSW1XX_HEADER_LEN))) {