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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>
This commit is contained in:
Michał Mirosław 2010-12-14 15:24:08 +00:00 committed by David S. Miller
parent bc2ce894e1
commit 04fb451eff
1 changed files with 5 additions and 0 deletions
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include/linux/skbuff.h
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@ -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;