[Xen-devel] Re: [1/4] [NET] back: Fix maximum fragment check

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Jul 2006, at 10:59, Herbert Xu wrote:

> > netback to advertise support for the ECN flag? I'm not sure exactly
> > what it will mean, and whether it can just be ignored by netbacks that
> > don't support it?
> If netback does not advertise the flag then netfront will perform
> segmentation before passing TCP packets with CWR set through.
Ah, okay, can that not be handled properly by some TSO-supporting NICs 
then? You need to do something smarter than simply duplicate the ECN 
bits in every segment header? What would happen if netfront sent 
through a packet with ECE/CWR and didn't set the GSO_ECN flag -- is it 
safe but stupid, will it break something, should dodgy packets have the 
GSO_ECN flag recomputed?
 Thanks!
 Keir


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