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) Thanks James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
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. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> 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. >Thanks. I guess I'll find out shortly :) James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel