datapath: Backport skb_frag_ functions

Define accessors skb_frag_* functions whch were introduced in 3.2

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

diff --git a/datapath/linux/compat/include/linux/skbuff.h b/datapath/linux/compat/include/linux/skbuff.h
index a5f8702..be134d7 100644 (file)
--- a/datapath/linux/compat/include/linux/skbuff.h
+++ b/datapath/linux/compat/include/linux/skbuff.h
@@ -194,6 +194,34 @@ static inline struct page *skb_frag_page(const skb_frag_t *frag)
 {
        return frag->page;
 }
+
+static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page)
+{
+       frag->page = page;
+}
+static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size)
+{
+       frag->size = size;
+}
+static inline void __skb_frag_ref(skb_frag_t *frag)
+{
+       get_page(skb_frag_page(frag));
+}
+static inline void __skb_frag_unref(skb_frag_t *frag)
+{
+       put_page(skb_frag_page(frag));
+}
+
+static inline void skb_frag_ref(struct sk_buff *skb, int f)
+{
+       __skb_frag_ref(&skb_shinfo(skb)->frags[f]);
+}
+
+static inline void skb_frag_unref(struct sk_buff *skb, int f)
+{
+       __skb_frag_unref(&skb_shinfo(skb)->frags[f]);
+}
+
 #endif
 
 #ifndef HAVE_SKB_RESET_MAC_LEN