Mailing List Archive: Re: [PATCH] Don't allow sharing of tx skbs on xen-netfront

From: Neil Horman <nhorman@tuxdriver.com>
Date: Mon, 14 Nov 2011 14:22:24 -0500

> It was pointed out to me recently that the xen-netfront driver can't safely
> support shared skbs on transmit, since, while it doesn't maintain skb state
> directly, it does pass a pointer to the skb to the hypervisor via a list, and
> the hypervisor may expect the contents of the skb to remain stable. Clearing
> the IFF_TX_SKB_SHARING flag after the call to alloc_etherdev to make it safe.
>
> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

Please put an appropriate prefix into the subject lines of your patch
submissions. In this case "[PATCH] xen-netfront: ..." would be appropriate.

I've been letting you get away with this for the past few weeks and I've
decided that it's your turn to start getting this right :-)

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On Mon, Nov 14, 2011 at 02:27:16PM -0500, David Miller wrote:
> From: Neil Horman <nhorman@tuxdriver.com>
> Date: Mon, 14 Nov 2011 14:22:24 -0500
>
> > It was pointed out to me recently that the xen-netfront driver can't safely
> > support shared skbs on transmit, since, while it doesn't maintain skb state
> > directly, it does pass a pointer to the skb to the hypervisor via a list, and
> > the hypervisor may expect the contents of the skb to remain stable. Clearing
> > the IFF_TX_SKB_SHARING flag after the call to alloc_etherdev to make it safe.
> >
> > Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
>
> Please put an appropriate prefix into the subject lines of your patch
> submissions. In this case "[PATCH] xen-netfront: ..." would be appropriate.
>
> I've been letting you get away with this for the past few weeks and I've
> decided that it's your turn to start getting this right :-)
Jeez Dave, I got it right on the cgroups post, you want consistency now
too? :).

Apologies, I need to consult a checklist for myself prior to sending stuff.

Best
Neil

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