netdev - Re: [PATCH] TX_RING and packet mmap

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Message-Id: <1239137800.21227.10.camel@dogo.mojatatu.com>
Date:	Tue, 07 Apr 2009 16:56:40 -0400
From:	jamal <hadi@...erus.ca>
To:	Johann Baudy <johann.baudy@...-log.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] TX_RING and packet mmap

On Tue, 2009-04-07 at 16:38 +0200, Johann Baudy wrote:
> Hi All, 
> Many thanks for your replies!
> 
> Indeed, I've tried to find a solution to store data in skb (valid
> until destructor).

Makes sense for what you are trying to do (or someone else a long
while back who wanted to notify user space of a sent skb).
Any skb metadata can mutate along its path. Actually even
if you used a field off the skb->data it too could be changed 
somewhere along the path before destructor is invoked.
There maybe a "hard way" to achieve your goal: use the address
of the skb to derive your index; i am not 100% sure if your destructor
will always be called (check skb_expand() for example).

cheers,
jamal

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