netdev - Re: [RFC] af-packet: Save reference to bound network device.

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Message-Id: <20110525.180113.1194226831134092545.davem@davemloft.net>
Date:	Wed, 25 May 2011 18:01:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] af-packet: Save reference to bound network device.

From: greearb@...delatech.com
Date: Wed, 25 May 2011 14:56:42 -0700

> From: Ben Greear <greearb@...delatech.com>
> 
> This saves a network device lookup on each packet transmitted,
> for sockets that are bound to a network device.
> 
> Signed-off-by: Ben Greear <greearb@...delatech.com>

You can't hold onto devices like this unless you also add a netdev
event notifier that will release it.  Otherwise we'll hang on net
driver module unload until the packet socket is closed.

I don't think you really want to walk all pf-packet sockets on netdev
events just to do this.

dev_get_by_index(,_rcu}() is insanely cheap, I doubt it's showing up
on your profiles at all.
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