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Subject[PATCH 3.16 372/410] skb: Add skb_postpush_rcsum()
3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@decadent.org.uk>

This is based on commit f8ffad69c9f8b8dfb0b633425d4ef4d2493ba61a upstream,
"bpf: add skb_postpush_rcsum and fix dev_forward_skb occasions". We don't
need the bpf fixes here, just the new function.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2477,6 +2477,23 @@ static inline void skb_postpull_rcsum(st

unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);

+static inline void skb_postpush_rcsum(struct sk_buff *skb,
+ const void *start, unsigned int len)
+{
+ /* For performing the reverse operation to skb_postpull_rcsum(),
+ * we can instead of ...
+ *
+ * skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
+ *
+ * ... just use this equivalent version here to save a few
+ * instructions. Feeding csum of 0 in csum_partial() and later
+ * on adding skb->csum is equivalent to feed skb->csum in the
+ * first place.
+ */
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->csum = csum_partial(start, len, skb->csum);
+}
+
/**
* pskb_trim_rcsum - trim received skb and update checksum
* @skb: buffer to trim
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