netdev - [PATCH 1/3] net: Introduce skb_checksum_start

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Message-Id: <b1d596064d2b9ae518f79ac82711ff84ea46a19d.1292372504.git.mirq-linux@rere.qmqm.pl>
Date:	Wed, 15 Dec 2010 02:24:08 +0100 (CET)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	netdev@...r.kernel.org
Subject: [PATCH 1/3] net: Introduce skb_checksum_start_offset()

Introduce skb_checksum_start_offset() to replace repetitive calculation.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 include/linux/skbuff.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 19f37a6..0491da5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1355,6 +1355,11 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 }
 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
 
+static inline int skb_checksum_start_offset(const struct sk_buff *skb)
+{
+	return skb->csum_start - skb_headroom(skb);
+}
+
 static inline int skb_transport_offset(const struct sk_buff *skb)
 {
 	return skb_transport_header(skb) - skb->data;
-- 
1.7.2.3

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