netdev - Re: [PATCH net-next v3 1/3] net: filter: simplify label names from jump-table

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Date:	Thu, 01 May 2014 11:50:13 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	davem@...emloft.net, ast@...mgrid.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/3] net: filter: simplify label names from
 jump-table

On Thu, 2014-05-01 at 19:39 +0200, Daniel Borkmann wrote:

> Well, if you review the code itself in filter.c it makes it hard
> to read and review, with this patch, you'll immediately get the
> label name and what it actually does, so I think it's quite convenient
> and way more readable by itself. For grepping, you can always add
> subdirectories you're searching for, besides that I don't think
> that everything in the kernel needs to have unique names only so
> that one can grep for it among the whole tree.



Considering that Alexei claimed :

+Internal BPF is a general purpose RISC instruction set. Not every register and
+every instruction are used during translation from original BPF to new format.
+For example, socket filters are not using 'exclusive add' instruction, but
+tracing filters may do to maintain counters of events, for example. Register R9
+is not used by socket filters either, but more complex filters may be running
+out of registers and would have to resort to spill/fill to stack.

I tried to verify this claim and I could not.

After your patch, it will be really this :

"We, Daniel and Alexei, hereby certify that this code is 100% safe.

 If you Eric, or anyone else, want to check, you'll have to grep in
appropriate places, and use your brain as we did."

I find very worrying all this stuff. This looks like you guys make
everything possible to make it absolutely unmaintainable.



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