netdev - RE: v4.15-rc2 on thinkpad x60: ethernet stopped working

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Date:   Fri, 15 Dec 2017 17:29:06 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Gabriel C <nix.or.die@...il.com>, Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>
CC:     "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: v4.15-rc2 on thinkpad x60: ethernet stopped working

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Gabriel C
> Sent: Sunday, December 10, 2017 4:44 AM
> To: Pavel Machek <pavel@....cz>; kernel list <linux-kernel@...r.kernel.org>
> Cc: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; intel-wired-
> lan@...ts.osuosl.org; netdev@...r.kernel.org
> Subject: Re: v4.15-rc2 on thinkpad x60: ethernet stopped working
> 
> On 10.12.2017 09:39, Pavel Machek wrote:
> > Hi!
> 
> Hi,
> 
> > In v4.15-rc2+, network manager can not see my ethernet card, and
> > manual attempts to ifconfig it up did not really help, either.
> >
> > Card is:
> >
> > 02:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
> > Controller
> >
> > Dmesg says:
> >
> >    dmesg | grep eth
> > [    0.648931] e1000e 0000:02:00.0 eth0: (PCI Express:2.5GT/s:Width
> > x1) 00:16:d3:25:19:04
> > [    0.648934] e1000e 0000:02:00.0 eth0: Intel(R) PRO/1000 Network
> > Connection
> > [    0.649012] e1000e 0000:02:00.0 eth0: MAC: 2, PHY: 2, PBA No:
> > 005302-003
> > [    0.706510] usbcore: registered new interface driver cdc_ether
> > [    6.557022] e1000e 0000:02:00.0 eth1: renamed from eth0
> > [    6.577554] systemd-udevd[2363]: renamed network interface eth0 to
> > eth1
> >
> > Any ideas ?
> 
> Yes , 19110cfbb34d4af0cdfe14cd243f3b09dc95b013 broke it.
> 
> See:
> https://bugzilla.kernel.org/show_bug.cgi?id=198047
> 
> Fix there :
> https://marc.info/?l=linux-kernel&m=151272209903675&w=2
> 
> Regards,
> 
> Gabriel C

Hi,

Digging into this, the problem is complicated. The original bug assumed behavior of the .check_for_link call, which is universally not implemented.

I think the correct fix is to revert 19110cfbb34d ("e1000e: Separate signaling for link check/link up", 2017-10-10) and find a more proper solution.

I don't think any other code which uses check_for_link expects the interface to return in the way this patch attempted.

Thanks,
Jake