netdev - Re: [PATCH] TX_RING and packet mmap

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Date:	Sun, 12 Apr 2009 22:30:34 +0200
From:	Johann Baudy <johann.baudy@...-log.net>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH] TX_RING and packet mmap

Where do you see that skb_shinfo(skb)->frags[i].page (not other
fields) can be overwritten ?

Thanks,
Johann

On Sun, Apr 12, 2009 at 9:52 PM, Evgeniy Polyakov <zbr@...emap.net> wrote:
> On Sun, Apr 12, 2009 at 09:27:37PM +0200, Johann Baudy (johann.baudy@...-log.net) wrote:
>> I've seen that during skb_linearize(), skb_shinfo(skb)->frags[i].page
>> is not lost even if pages has been put. So I can get back original
>> frag address from this info in skb destructor. Can I rely on
>> skb_shinfo(skb)->frags[i].page on more complicated sending paths ... ?
>
> skb_shinfo(skb)->frags[i] can be overwritten, for example in
> __pskb_pull_tail() at pull_pages: label.
>
> --
>        Evgeniy Polyakov
>



-- 
Johann Baudy
johaahn@...il.com
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