net: Introduce skb_checksum_start_offset()
Introduce skb_checksum_start_offset() to replace repetitive calculation.
Signed-off-by: Michał Mirosław <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4c4bec63..20ec0a64 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1355,6 +1355,11 @@
}
#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;
