netdev - Re: [net-next 01/13] e1000e: Fix no connectivity when driver loaded with cable out

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Date:	Fri, 18 Apr 2014 14:15:46 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	David Ertman <davidx.m.ertman@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	sassmann@...hat.com
Subject: Re: [net-next 01/13] e1000e: Fix no connectivity when driver loaded
 with cable out

On Mon, 2014-03-31 at 16:34 -0700, Jeff Kirsher wrote:
> From: David Ertman <davidx.m.ertman@...el.com>
> 
> In commit da1e2046e5, the flow for enabling/disabling an Si errata
> workaround (e1000_lv_jumbo_workaround_ich8lan) was changed to fix a problem
> with iAMT connections dropping on interface down with jumbo frames set.
> Part of this change was to move the function call disabling the workaround
> to e1000e_down() from the e1000_setup_rctl() function.  The mechanic for
> disabling of this workaround involves writing several MAC and PHY registers
> back to hardware defaults.
> 
> After this commit, when the driver is loaded with the cable out, the PHY
> registers are not programmed with the correct default values.  This causes
> the device to be capable of transmitting packets, but is unable to recieve
> them until this workaround is called.
[...]

Which devices are affected by this?  I just did a backport of e1000e
from 3.13 for Debian 7.5 and didn't spot this fix until later.

I couldn't reproduce this problem on my laptop, which has:

00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network Connection [8086:1502] (rev 04)

Ben.

-- 
Ben Hutchings
Lowery's Law:
             If it jams, force it. If it breaks, it needed replacing anyway.

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