Re: [Xen-devel] [PATCH net-next v4 3/5] xen-netback: Unconditionally set NETIF_F_RXCSUM

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Ian Campbell
> Sent: 14 October 2013 11:56
> To: Paul Durrant
> Cc: xen-devel@xxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; Wei Liu; David Vrabel
> Subject: Re: [PATCH net-next v4 3/5] xen-netback: Unconditionally set
> NETIF_F_RXCSUM
> 
> On Fri, 2013-10-11 at 16:06 +0100, Paul Durrant wrote:
> > There is no mechanism to insist that a guest always generates a packet
> > with good checksum (at least for IPv4)
> 
> Isn't this what feature-no-csum-offload is?
> 

Theoretically, yes, but netback does not have code to advertise that flag (and 
never has?) and I don't see anything in xen-netfront that checks such a flag so 
I think we have to assume it's not going to be honoured even if we were to 
introduce it now.

  Paul
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