netdev - Re: tap/bridge: Dropping NETIF_F_GSO/NETIF_F

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Message-ID: <20110516094821.GA9427@redhat.com>
Date:	Mon, 16 May 2011 12:48:21 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	Shan Wei <shanwei@...fujitsu.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	netdev@...r.kernel.org, Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: tap/bridge: Dropping NETIF_F_GSO/NETIF_F_SG

On Mon, May 16, 2011 at 07:38:22PM +1000, Herbert Xu wrote:
> On Mon, May 16, 2011 at 11:18:41AM +0300, Michael S. Tsirkin wrote:
> >
> > There's no interface for userspace to enable it: userspace
> > only has an ioctl to enable/disable checksum offloading.
> > SG is an implementation detail.
> 
> Yes there is: ethtool -K
> 
> Cheers,

Ok. You are right of course, I was confused.

So it's just an info message: in the end if userspace DTRT features
get enabled properly. Functionally, there is no regression.

Both bridge and tun trigger the messages ATM. I note that
dev.c takes pains to avoid these messages:
	Avoid warning from netdev_fix_features() for GSO without SG

Should all drivers do this: clear _SG if they clear checksum?  What about _GSO?
If we start doing this, this spills info about flag dependencies out to drivers.

-- 
MST
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