netdev - Re: [PATCH] net: tun: convert to hw

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Message-ID: <87r58ol26k.fsf@rustcorp.com.au>
Date:	Wed, 27 Apr 2011 14:29:31 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	David Miller <davem@...emloft.net>, mirq-linux@...e.qmqm.pl
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: tun: convert to hw_features

On Wed, 20 Apr 2011 01:32:16 -0700 (PDT), David Miller <davem@...emloft.net> wrote:
> From: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Date: Tue, 19 Apr 2011 18:13:10 +0200 (CEST)
> 
> > This changes offload setting behaviour to what I think is correct:
> >  - offloads set via ethtool mean what admin wants to use (by default
> >    he wants 'em all)
> >  - offloads set via ioctl() mean what userspace is expecting to get
> >    (this limits which admin wishes are granted)
> >  - TUN_NOCHECKSUM is ignored, as it might cause broken packets when
> >    forwarded (ip_summed == CHECKSUM_UNNECESSARY means that checksum
> >    was verified, not that it can be ignored)
> > 
> > If TUN_NOCHECKSUM is implemented, it should set skb->csum_* and
> > skb->ip_summed (= CHECKSUM_PARTIAL) for known protocols and let others
> > be verified by kernel when necessary.
> > 
> > TUN_NOCHECKSUM handling was introduced by commit
> > f43798c27684ab925adde7d8acc34c78c6e50df8:
> > 
> >     tun: Allow GSO using virtio_net_hdr
> >     
> > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> 
> Applied.

Dave, you just removed a feature that has been in Linux since before
git.  It *probably* just means we go slower in cases we don't really
care about.  But does removing it break qemu?  Has anyone tested?

Thanks,
Rusty.

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