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

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Message-ID: <20111114193233.GD27284@hmsreliant.think-freely.org>
Date:	Mon, 14 Nov 2011 14:32:33 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, jeremy.fitzhardinge@...rix.com,
	konrad.wilk@...cle.com, xen-devel@...ts.xensource.com
Subject: Re: [PATCH] Don't allow sharing of tx skbs on xen-netfront

On Mon, Nov 14, 2011 at 02:27:16PM -0500, David Miller wrote:
> From: Neil Horman <nhorman@...driver.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@...driver.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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