Re: [Xen-devel] tcp offload with ip or tcp options

On Thu, 2011-05-12 at 13:08 +0100, James Harper wrote:
> Is TCP LSO and/or checksum offload supported when IP or TCP options are
> present in the packet? Or is that dependent on the underlying hardware
> (for which there is no way to indicate to DomU I think)

I think it ought to work.

Until recently Linux netback might not have included enough bytes in the
Linux part of an SKB to cover TCP/IP headers including options. That's
fixed in xen/stable-2.6.32.x though via 0cbb2dd6d518 and it was fixed
already in the version which went upstream in 2.6.39. I don't know how
versions before that actually behave in practice though.

Ian.

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