diff options
| 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 /net/core/datagram.c | |
| 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 'net/core/datagram.c')
| -rw-r--r-- | net/core/datagram.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 186212b5b7da..cb056f476126 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -411,11 +411,11 @@ fault: return -EFAULT; } -__sum16 __skb_checksum_complete(struct sk_buff *skb) +__sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len) { __sum16 sum; - sum = csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)); + sum = csum_fold(skb_checksum(skb, 0, len, skb->csum)); if (likely(!sum)) { if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE)) netdev_rx_csum_fault(skb->dev); @@ -423,6 +423,12 @@ __sum16 __skb_checksum_complete(struct sk_buff *skb) } return sum; } +EXPORT_SYMBOL(__skb_checksum_complete_head); + +__sum16 __skb_checksum_complete(struct sk_buff *skb) +{ + return __skb_checksum_complete_head(skb, skb->len); +} EXPORT_SYMBOL(__skb_checksum_complete); /** |