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[Xen-devel] Re: SKB paged fragment lifecycle on receive

from [David Miller] [Permanent Link][Original]
To: jeremy@xxxxxxxx
Subject: [Xen-devel] Re: SKB paged fragment lifecycle on receive
From: David Miller <davem@xxxxxxxxxxxxx>
Date: Fri, 24 Jun 2011 12:46:24 -0700 (PDT)
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From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 24 Jun 2011 11:21:15 -0700

>> Dangerous I would say. You could have a skb1 page transferred to another
>> skb2, and call skb1 destructor way before page being released.
> 
> Under what circumstances would that happen?

Pages get transferred between different SKBs all the time.

For example, GRO makes extensive use of this technique.
See net/core/skbuff.c:skb_gro_receive().

It is just one example.

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