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Date:	Mon, 16 May 2011 18:07:02 +1000
From:	Herbert Xu <>
To:	"Michael S. Tsirkin" <>
Cc:	Shan Wei <>,
	Michał Mirosław <>,, Ben Hutchings <>
Subject: Re: tap/bridge: Dropping NETIF_F_GSO/NETIF_F_SG

On Mon, May 16, 2011 at 10:32:10AM +0300, Michael S. Tsirkin wrote:
> So how is NETIF_F_SG supposed to be enabled then?

It should either be enabled at device creation time, or whatever
user-space entity managing the device creation should enable it
along with checksumming and anything else applicable.

> In upstream kernels userspace can disable checksum offloading then
> re-enable and get SG set back.  userspace came to depend on this
> behaviour so I think changing this is a regression.

Can you point me to the relevant code in the upstream kernel?
I'm not aware of any automatic SG enabling for network devices
in general when you enable checksum offloading.

Email: Herbert Xu <>
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