[RFC][PATCH v6 01/19] Add a new structure for skb buffer from external.

[xiaohui . xin]

From: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>

Signed-off-by: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Zhao Yu <yzhao81new@xxxxxxxxx>
Reviewed-by: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
---
 include/linux/skbuff.h |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 124f90c..cf309c9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -203,6 +203,18 @@ struct skb_shared_info {
 	void *		destructor_arg;
 };
 
+/* The structure is for a skb which skb->data may point to
+ * an external buffer, which is not allocated from kernel space.
+ * Since the buffer is external, then the shinfo or frags are
+ * also extern too. It also contains a destructor for itself.
+ */
+struct skb_external_page {
+	u8              *start;
+	int             size;
+	struct skb_frag_struct *frags;
+	struct skb_shared_info *ushinfo;
+	void		(*dtor)(struct skb_external_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
-- 
1.5.4.4

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