netdev - Re: RFC: New BGF 'LOOP' instruction

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Date:	Tue, 03 Aug 2010 11:03:21 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	David Miller <davem@...emloft.net>
Cc:	<leonerd@...nerd.org.uk>, <netdev@...r.kernel.org>
Subject: Re: RFC: New BGF 'LOOP' instruction


On Mon, 02 Aug 2010 22:18:13 -0700 (PDT), David Miller wrote:

> Oh yeah, what is an iteration in your definition?  See this is why I
> totally refuse to add a looping construct to BPF.
> 
> If you just check for a single loop hitting, the user will just use
> a chaining of two looping constructs.  And then three levels of
> indirection, then four, etc.  He can run up to just before exhasting
> the "iteration limit" of one loop, and branch to the next one, and
> so on and so forth.

I am aware of any problems caused by complex instructions. David, I was
rather curious to see an unrecognized and ground breaking instructions, I
don't wanted to scotch any (possible) improvement.

HGN
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