netdev - [PATCH v16 01/17] Add a new structure for skb buffer from external.

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Message-Id: <fc6e95d63a2c62aaf77f8ded22fc43ccefcdbbff.1291187695.git.xiaohui.xin@intel.com>
Date:	Wed,  1 Dec 2010 16:08:12 +0800
From:	xiaohui.xin@...el.com
To:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	davem@...emloft.net, herbert@...dor.apana.org.au,
	jdike@...ux.intel.com
Cc:	Xin Xiaohui <xiaohui.xin@...el.com>
Subject: [PATCH v16 01/17] Add a new structure for skb buffer from external.

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

Signed-off-by: Xin Xiaohui <xiaohui.xin@...el.com>
Signed-off-by: Zhao Yu <yzhao81new@...il.com>
Reviewed-by: Jeff Dike <jdike@...ux.intel.com>
---
 include/linux/skbuff.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 77eb60d..696e690 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -211,6 +211,15 @@ struct skb_shared_info {
 	skb_frag_t	frags[MAX_SKB_FRAGS];
 };
 
+/* 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
-- 
1.7.3

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