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xen-devel
RE: [Xen-devel] ip/udp checksum offload from minios guest
>
> On Tue, 2011-03-29 at 23:26 +0100, Anil Madhavapeddy wrote:
> > Thanks, this is all clear now. I was not setting NETTXF_data_validated
> > along with NETTXF_csum_blank in my transmit path, which was confusing
> > the backend.
>
> Right, that would have ended up confusing things, I think. c_s && !d_v
> still ends up a CHECKSUM_PARTIAL in relatively recent backends. I'm not
> sure that has always been implemented correctly though.
>
> In recent netback there is fixup for the case where a GSO packet sets
> csum_blank but not data_validated which recalculates the partial
> checksum (since Linux requires that all GSO SKBs are CHECKSUM_PARTIAL to
> simplify the software GSO checksum stuff). That's only in the GSO case
> though since we can't detect it otherwise.
>
> > Ian: yes the IPv4 checksum is of course only over the header. I wrote
> > the code right, and then re-read it wrong while hacking on a flight :)
>
> Easily done!
>
> > The ICMP errors confused me (since I was setting NETTXF_csum_blank for
> > those too and the checksum functions error out).
>
> Yeah, don't do that ;-)
>
Is IPv6 offload (gso and/or checksum) supported at this time?
James
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