[v12,01/17] Add a new structure for skb buffer from external.

Commit Message

Xin, Xiaohui Sept. 30, 2010, 2:04 p.m. UTC

None

Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 124f90c..74af06c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -203,6 +203,15 @@  struct skb_shared_info {
 	void *		destructor_arg;
 };
 
+/* The structure is for a skb which pages may point to
+ * an external buffer, which is not allocated from kernel space.
+ * It also contains a destructor for itself.
+ */
+struct skb_ext_page {
+	struct		page *page;
+	void		(*dtor)(struct skb_ext_page *);
+};
+
 /* We divide dataref into two halves.  The higher 16 bits hold references
  * to the payload part of skb->data.  The lower 16 bits hold references to
  * the entire skb->data.  A clone of a headerless skb holds the length of