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| author |   Herbert Xu <herbert@gondor.apana.org.au> | 2007-03-25 20:10:56 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:23:51 -0700 |
| commit | 759e5d006462d53fb708daa8284b4ad909415da1 (patch) | |
| tree | edcc4e9d975199b3fe5e2aadc3d1e06824755e75 /include/net/udp.h | |
| parent | [UDP6]: Restore sk_filter optimisation (diff) | |
| download | linux-dev-759e5d006462d53fb708daa8284b4ad909415da1.tar.xz linux-dev-759e5d006462d53fb708daa8284b4ad909415da1.zip | |
[UDP]: Clean up UDP-Lite receive checksum
This patch eliminates some duplicate code for the verification of
receive checksums between UDP-Lite and UDP. It does this by
introducing __skb_checksum_complete_head which is identical to
__skb_checksum_complete_head apart from the fact that it takes
a length parameter rather than computing the first skb->len bytes.
As a result UDP-Lite will be able to use hardware checksum offload
for packets which do not use partial coverage checksums. It also
means that UDP-Lite loopback no longer does unnecessary checksum
verification.
If any NICs start support UDP-Lite this would also start working
automatically.
This patch removes the assumption that msg_flags has MSG_TRUNC clear
upon entry in recvmsg.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/udp.h')
| -rw-r--r-- | include/net/udp.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index 1b921fa81474..4a9699f79281 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -72,10 +72,7 @@ struct sk_buff; */ static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) { - if (! UDP_SKB_CB(skb)->partial_cov) - return __skb_checksum_complete(skb); - return csum_fold(skb_checksum(skb, 0, UDP_SKB_CB(skb)->cscov, - skb->csum)); + return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); } static inline int udp_lib_checksum_complete(struct sk_buff *skb) |