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    SubjectRe: 2.6.18-rc1-mm2
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    On Fri, Jul 14, 2006 at 12:05:51AM -0700, Andrew Morton wrote:
    >
    > > Call Trace:
    > > [<ffffffff8026963e>] show_trace+0xae/0x265
    > > [<ffffffff8026980a>] dump_stack+0x15/0x1b
    > > [<ffffffff8043ba7b>] skb_checksum_help+0x61/0x126
    > > [<ffffffff8802f35f>] :iptable_nat:ip_nat_fn+0x5f/0x1d2

    This is tell you that there is a bug in ip_nat_fn in that it completes
    the partial checksum even for TSO packets which will cause them to go
    out with bogus checksums.

    The warning also indicates that the system has detected this and has
    worked around it by recomputing the partial checksum after NAT.

    The warning is here so someone can fix NAT to not trash the partial
    checksum. It would also tell us if anyone else breaks checksums in
    this way.

    I've already made the warning appear only once per-boot so I'd really
    like to keep it in until

    1) NAT is fixed.
    2) We're reasonably sure there's nothing else doing this.

    Prior to this change your TSO packets would've gone out with corrupted
    checksums silently. Essentially TSO would only slow your machine down
    since every transmission it makes has to be retransmitted as non-TSO.

    Cheers,
    --
    Visit Openswan at http://www.openswan.org/
    Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
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