From 04fb451eff978ca059399eab83d5594b073caf6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@rere.qmqm.pl>
Date: Tue, 14 Dec 2010 15:24:08 +0000
Subject: [PATCH] net: Introduce skb_checksum_start_offset()
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Introduce skb_checksum_start_offset() to replace repetitive calculation.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/skbuff.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4c4bec6316d9..20ec0a64cb9f 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;
--
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