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[UDP]: Clean up UDP-Lite receive checksum

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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>
This commit is contained in:
Herbert Xu
2007-03-25 20:10:56 -07:00
committed by David S. Miller
parent 1ab6eb62b0
commit 759e5d0064
8 changed files with 109 additions and 120 deletions
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2
net/ipv4/udplite.c
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@@ -31,7 +31,7 @@ static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
static int udplite_rcv(struct sk_buff *skb)
{
return __udp4_lib_rcv(skb, udplite_hash, 1);
return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
}
static void udplite_err(struct sk_buff *skb, u32 info)