netdev - Re: DPAA Ethernet traffice troubles with Linux kernel

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Message-ID: <20180116143836.GC22903@lunn.ch>
Date:   Tue, 16 Jan 2018 15:38:36 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "madalin.bucur@....com" <madalin.bucur@....com>,
        "madskateman@...il.com" <madskateman@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: DPAA Ethernet traffice troubles with Linux kernel

> Hi, just saw this and thought of a small patch I just wrote for mdio bus, o idea
> if it is relevant but here goes:
> 
> From fe0b98d54a79779482700676331b4d10a0f3cada Mon Sep 17 00:00:00 2001
> From: Joakim Tjernlund <joakim.tjernlund@...inera.com>
> Date: Sun, 14 Jan 2018 21:27:20 +0100
> Subject: [PATCH] of_mdiobus_register: Continue after error
> 
> of_mdiobus_register unregister itself if one phy fails to register
> which is bad for system having all its PHYs on the same MDIO bus.
> Just log the error and continue with the remaining PHYs instead.
> 
> Signed-off-by: Joakim Tjernlund <joakim.tjernlund@...inera.com>

Hi Joakim

You appear to be using an old kernel. Take a look at:

commit 95f566de0269a0c59fd6a737a147731302136429
Author: Madalin Bucur <madalin.bucur@....com>
Date:   Tue Jan 9 14:43:34 2018 +0200

    of_mdio: avoid MDIO bus removal when a PHY is missing
    
    If one of the child devices is missing the of_mdiobus_register_phy()
    call will return -ENODEV. When a missing device is encountered the
    registration of the remaining PHYs is stopped and the MDIO bus will
    fail to register. Propagate all errors except ENODEV to avoid it.
    
    Signed-off-by: Madalin Bucur <madalin.bucur@....com>
    Reviewed-by: Andrew Lunn <andrew@...n.ch>
    Signed-off-by: David S. Miller <davem@...emloft.net>


    Andrew