netdev - Re: Network drivers that don't suspend on interface down

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Message-ID: <20061219155133.20132824@freekitty>
Date:	Tue, 19 Dec 2006 15:51:33 -0800
From:	Stephen Hemminger <shemminger@...l.org>
To:	Rick Jones <rick.jones2@...com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Network drivers that don't suspend on interface down

On Wed, 20 Dec 2006 15:37:41 -0800
Rick Jones <rick.jones2@...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@...l.org>
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