[RFC PATCH v7 01/19] Add a new structure for skb buffer from external.

xiaohui.xin
2010-06-05T10:14:40Z

From: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
Reviewed-by: Jeff Dike <jdike@linux.intel.com>
---
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