Re: [Xen-devel] [PATCH net] xen-netback: make sure that hashes are not send to unaware frontends

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: David Miller [mailto:davem@xxxxxxxxxxxxx]
> Sent: 07 October 2016 06:38
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx; Wei Liu
> <wei.liu2@xxxxxxxxxx>
> Subject: Re: [PATCH net] xen-netback: make sure that hashes are not send
> to unaware frontends
> 
> From: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Date: Thu, 6 Oct 2016 15:47:10 +0100
> 
> > In the case when a frontend only negotiates a single queue with xen-
> > netback it is possible for a skbuff with a s/w hash to result in a
> > hash extra_info segment being sent to the frontend even when no hash
> > algorithm has been configured. (The ndo_select_queue() entry point
> > makes sure the hash is not set if no algorithm is configured, but this
> > entry point is not called when there is only a single queue). This can
> > result in a frontend that isunable to handle extra_info segments being
> > given such a segment, causing it to crash.
> >
> > This patch fixes the problem by gating whether the extra_info is sent
> > not only on the presence of a s/w hash, but also on whether the hash
> > algorithm has been configured.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> > Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> This doesn't apply cleanly to the current 'net' tree, please respin.
> 

Sure. V2 coming.

  Paul

> Thanks.

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