netdev - Re: [PATCH] bnx2: Fix the behavior of ethtool when ONBOOT=no

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Date:	Wed, 24 Jun 2009 16:48:32 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	"rick.jones2@...com" <rick.jones2@...com>,
	"nooiwa@...aclelinux.com" <nooiwa@...aclelinux.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] bnx2: Fix the behavior of ethtool when ONBOOT=no


On Wed, 2009-06-24 at 16:42 -0700, David Miller wrote:
> From: "Michael Chan" <mchan@...adcom.com>
> Date: Wed, 24 Jun 2009 09:59:20 -0700
> 
> > On Wed, 2009-06-24 at 09:43 -0700, Rick Jones wrote:
> >> Why?  Sure, there is no IP on the link, but does that mean the link is 
> >> otherwise unusable?  Is ethtool only about IP status?
> >> 
> > 
> > Once the device is closed, we no longer keep track of the link state and
> > no longer have register access to determine the link state.  So we
> > assume it is down.  In reality, it may still be up if WoL is enabled or
> > management firmware is running, but the driver can no longer keep track
> > of it.  If we have to assume one or the other, I think it is more
> > correct to assume it is down.
> 
> This is a big problem.  I misread this situation when I decided to
> apply the patch yesterday, sorry.  We're going to have to revert it.
> 
> Applications like NetworkManager decide which devices to bring up and
> attempt DHCP etc. on based upon the link status.
> 
> So if we report link down, the interface won't even be tried even if a
> cable is plugged in.
> 
> Actually I wonder, does NM bring the interface "up" before checking
> link state?  Does anyone know?
> 

I don't know about NetworkManager, but the old ifup script will bring up
the device, wait up to 5 seconds for link up, and then do DHCP.


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