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

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Date:	Thu, 5 May 2011 17:26:44 +0200
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	netdev@...r.kernel.org, Ben Hutchings <bhutchings@...arflare.com>,
	herbert@...dor.hengli.com.au
Subject: Re: tap/bridge: Dropping NETIF_F_GSO/NETIF_F_SG

On Wed, May 04, 2011 at 09:18:14PM +0300, Michael S. Tsirkin wrote:
> BTW, I just noticed that net-next spits out
> many of the following when I run any VMs:
[...]
> tap0: Features changed: 0x40004040 -> 0x401b4849

Before this message, userspace called ioctl(TIOCSETOFFLOAD)
turning offloads on.

> tap0: Dropping NETIF_F_SG since no checksum feature.
> tap0: Dropping NETIF_F_GSO since no SG feature.
> tap0: Features changed: 0x401b4849 -> 0x40004040

And then it probably called ioctl(TIOCSETOFFLOAD) again, disabling them.

Best Regards,
Michał Mirosław
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