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

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Date:	Wed, 20 Dec 2006 15:37:41 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Stephen Hemminger <shemminger@...l.org>
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

> 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
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