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

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Message-ID: <20110516104309.GA3534@gondor.apana.org.au>
Date:	Mon, 16 May 2011 20:43:10 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
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 12:48:21PM +0300, Michael S. Tsirkin wrote:
>
> 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.

Drivers don't need to do this at all since the network stack
will automatically clear SG and related features if checksum
is disabled.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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