SKBFL_MANAGED_FRAG_REFS
return skb_shinfo(skb)->flags & SKBFL_MANAGED_FRAG_REFS;
SKBFL_DONT_ORPHAN | SKBFL_MANAGED_FRAG_REFS)
shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
bool skip_unref = shinfo->flags & SKBFL_MANAGED_FRAG_REFS;
skb_shinfo(skb)->flags &= ~SKBFL_MANAGED_FRAG_REFS;