netdev - Re: Problem: net: mvneta: auto-negotiation with disconnected network cable

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Message-ID: <b7737751-b051-b717-a856-3e11c73dd25d@list.ru>
Date:   Thu, 23 Mar 2017 01:03:37 +0300
From:   Stas Sergeev <stsp@...t.ru>
To:     Maxime Morin <maxime.morin@...ec.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "thomas.petazzoni@...e-electrons.com" 
        <thomas.petazzoni@...e-electrons.com>
Subject: Re: Problem: net: mvneta: auto-negotiation with disconnected network
 cable

22.03.2017 16:23, Maxime Morin пишет:
> Hi all,
>
> I work on an embedded platform based on the Marvell Armada 88F6707, that is connected to a Marvell Alaska 88E1512 ethernet transceiver. A defect has appeared recently, and it turns out to be a regression on the network part. There is a complete lost of the network when following these steps:
>      1) boot the board with the network cable disconnected
>      2) run the following commands (or equivalent):
>          ip link set eth0 up
>          ip addr add 10.0.0.80/24 dev eth0
>          ethtool -s eth0 autoneg on #this is the command that really breaks the network
In fact, the problem is that this control is
counter-intuitive. It could instead be

ethtool autoneg [on|off|mdio|inband]

with "on" implying "mdio". In that case you would
never notice the change. Unfortunately there seems
to be no way of passing the autoneg mode, so I fused
"on" to "inband"... So, unless I am mistaken, this clearly
needs a rework. But I have really forgot all the details.