linux-kernel - Re: [BUG] igb: reconnecting of cable not always detected

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Date:   Tue, 24 Apr 2018 20:30:13 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Holger Schurig <holgerschurig@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] igb: reconnecting of cable not always detected

On Tue, Apr 24, 2018 at 11:09:02AM -0700, Alexander Duyck wrote:
> On Tue, Apr 24, 2018 at 8:14 AM, Holger Schurig <holgerschurig@...il.com> wrote:
> > Sometimes, plugging the cable back in is detected ...
> >
> > [   43.736922] igb 0000:02:00.0 eth0: igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> >
> > ... but sometimes this is *NOT* detected. I can put the cable in and
> > even after two minutes nothing has been detected.
> >
> > But when I run "rmmod igb" followed by "modpobe igb", the link is
> > detected again:

FWIW, I have noticed over the past months (or even years?) that my
i210 cards (or the igb driver) also fail to detect link changes after
a few physical link interruptions.  I never bothered to try and debug
this, but it is super annoying.

Thanks,
Richard