1 files changed, 39 insertions, 16 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 43c37385f1e9..9fcf534f2d92 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -533,6 +533,13 @@ enum {
 struct ubuf_info {
 	void (*callback)(struct sk_buff *, struct ubuf_info *,
 			 bool zerocopy_success);
+	refcount_t refcnt;
+	u8 flags;
+};
+
+struct ubuf_info_msgzc {
+	struct ubuf_info ubuf;
+
 	union {
 		struct {
 			unsigned long desc;
@@ -545,8 +552,6 @@ struct ubuf_info {
 			u32 bytelen;
 		};
 	};
-	refcount_t refcnt;
-	u8 flags;
 
 	struct mmpin {
 		struct user_struct *user;
@@ -555,6 +560,8 @@ struct ubuf_info {
 };
 
 #define skb_uarg(SKB)	((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))
+#define uarg_to_msgzc(ubuf_ptr)	container_of((ubuf_ptr), struct ubuf_info_msgzc, \
+					     ubuf)
 
 int mm_account_pinned_pages(struct mmpin *mmp, size_t size);
 void mm_unaccount_pinned_pages(struct mmpin *mmp);
@@ -2445,6 +2452,27 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
 	skb_shinfo(skb)->nr_frags = i + 1;
 }
 
+/**
+ * skb_fill_page_desc_noacc - initialise a paged fragment in an skb
+ * @skb: buffer containing fragment to be initialised
+ * @i: paged fragment index to initialise
+ * @page: the page to use for this fragment
+ * @off: the offset to the data with @page
+ * @size: the length of the data
+ *
+ * Variant of skb_fill_page_desc() which does not deal with
+ * pfmemalloc, if page is not owned by us.
+ */
+static inline void skb_fill_page_desc_noacc(struct sk_buff *skb, int i,
+					    struct page *page, int off,
+					    int size)
+{
+	struct skb_shared_info *shinfo = skb_shinfo(skb);
+
+	__skb_fill_page_desc_noacc(shinfo, i, page, off, size);
+	shinfo->nr_frags = i + 1;
+}
+
 void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
 		     int size, unsigned int truesize);
 
@@ -2588,20 +2616,6 @@ void *skb_pull_data(struct sk_buff *skb, size_t len);
 
 void *__pskb_pull_tail(struct sk_buff *skb, int delta);
 
-static inline void *__pskb_pull(struct sk_buff *skb, unsigned int len)
-{
-	if (len > skb_headlen(skb) &&
-	    !__pskb_pull_tail(skb, len - skb_headlen(skb)))
-		return NULL;
-	skb->len -= len;
-	return skb->data += len;
-}
-
-static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)
-{
-	return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len);
-}
-
 static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
 {
 	if (likely(len <= skb_headlen(skb)))
@@ -2611,6 +2625,15 @@ static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
 	return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL;
 }
 
+static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)
+{
+	if (!pskb_may_pull(skb, len))
+		return NULL;
+
+	skb->len -= len;
+	return skb->data += len;
+}
+
 void skb_condense(struct sk_buff *skb);
 
 /**