netdev - Re: [PATCH] ipv4: Create and use fib_compute_spec

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Date:	Thu, 05 Jul 2012 00:59:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ja@....bg, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: Create and use fib_compute_spec_dst() helper.

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 05 Jul 2012 09:52:25 +0200

> [PATCH] ipv4: defer fib_compute_spec_dst() call
> 
> ip_options_compile() can avoid calling fib_compute_spec_dst()
> by default, and perform the call if needed.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Yes, this is a great idea.  Actually in some obscure cases your
change can cause us to compute it more than once I think.

I'd suggest we do something like create a helper function above this
code in ip_options.c that checks whether spec_dst is INADDR_ANY or
not, to guard computing it multiple times.

Could you put together a quick patch like that?
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