Date: Tue, 19 Dec 2006 15:51:33 -0800
From: Stephen Hemminger <shemminger@osdl.org>
To: Rick Jones <rick.jones2@hp.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
       Matthew Garrett <mjg59@srcf.ucam.org>, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
Subject: Re: Network drivers that don't suspend on interface down
Message-ID: <20061219155133.20132824@freekitty>
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On Wed, 20 Dec 2006 15:37:41 -0800
Rick Jones <rick.jones2@hp.com> wrote:

> > There are two different problems:
> > 
> > 1) Behavior seems to be different depending on device driver
> >    author. We should document the expected semantics better.
> > 
> >    IMHO:
> > 	When device is down, it should:
> > 	 a) use as few resources as possible:
> > 	       - not grab memory for buffers
> > 	       - not assign IRQ unless it could get one
> > 	       - turn off all power consumption possible
> > 	 b) allow setting parameters like speed/duplex/autonegotiation,
> >             ring buffers, ... with ethtool, and remember the state
> > 	 c) not accept data coming in, and drop packets queued
> 
> What implications does c have for something like tcpdump?
> 
> rick jones

None, you can bring up the device without actually assigning an address to it.

-- 
Stephen Hemminger <shemminger@osdl.org>
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