linux-kernel - Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel

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Message-ID: <1285770689.31343.9.camel@localhost.localdomain>
Date:	Wed, 29 Sep 2010 07:31:29 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Avi Kivity <avi@...hat.com>,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host
 kernel

On Wed, 2010-09-29 at 10:16 +0200, Michael S. Tsirkin wrote:
> If you look at dev_hard_start_xmit you will see a call
> to skb_orphan_try which often calls the skb destructor.
> So I suspect this is almost equivalent to your original patch,
> and has the same correctness issue.

I forgot to mention, in skb_orphan_try, I still kept the skb->sk
reference to sk, I assign skb->sk to NULL when the DMA done.

Thanks
Shirley

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