1 files changed, 19 insertions, 5 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 33370271b8b2..111f26b6e28b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -238,11 +238,12 @@ enum {
 /*
  * The callback notifies userspace to release buffers when skb DMA is done in
  * lower device, the skb last reference should be 0 when calling this.
- * The desc is used to track userspace buffer index.
+ * The ctx field is used to track device context.
+ * The desc field is used to track userspace buffer index.
  */
 struct ubuf_info {
-        void (*callback)(void *);
-        void *arg;
+        void (*callback)(struct ubuf_info *);
+        void *ctx;
         unsigned long desc;
 };
 
@@ -481,6 +482,7 @@ struct sk_buff {
         union {
                 __u32           mark;
                 __u32           dropcount;
+                __u32           avail_size;
         };
 
         sk_buff_data_t          transport_header;
@@ -1018,7 +1020,7 @@ static inline void skb_queue_splice(const struct sk_buff_head *list,
 }
 
 /**
- *      skb_queue_splice - join two skb lists and reinitialise the emptied list
+ *      skb_queue_splice_init - join two skb lists and reinitialise the emptied list
  *      @list: the new list to add
  *      @head: the place to add it in the first list
  *
@@ -1049,7 +1051,7 @@ static inline void skb_queue_splice_tail(const struct sk_buff_head *list,
 }
 
 /**
- *      skb_queue_splice_tail - join two skb lists and reinitialise the emptied list
+ *      skb_queue_splice_tail_init - join two skb lists and reinitialise the emptied list
  *      @list: the new list to add
  *      @head: the place to add it in the first list
  *
@@ -1366,6 +1368,18 @@ static inline int skb_tailroom(const struct sk_buff *skb)
 }
 
 /**
+ *      skb_availroom - bytes at buffer end
+ *      @skb: buffer to check
+ *
+ *      Return the number of bytes of free space at the tail of an sk_buff
+ *      allocated by sk_stream_alloc()
+ */
+static inline int skb_availroom(const struct sk_buff *skb)
+{
+        return skb_is_nonlinear(skb) ? 0 : skb->avail_size - skb->len;
+}
+
+/**
  *      skb_reserve - adjust headroom
  *      @skb: buffer to alter
  *      @len: bytes to move