netdev - Re: Marvell switch port shows LOWERLAYERDOWN, ping fails

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Message-ID: <afed8a23-de6b-bcf2-e87f-8b68113abca5@helixd.com>
Date:   Wed, 28 Jul 2021 13:54:15 -0700
From:   Dario Alcocer <dalcocer@...ixd.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: Marvell switch port shows LOWERLAYERDOWN, ping fails

On 7/28/21 1:47 PM, Andrew Lunn wrote:
>> Many thanks for the link; I will build and install it on the target. Hope it
>> will work with the older kernel (5.4.114) we're using.
> 
> Probably not. You need
> 
> commit b71a8d60252111d89dccba92ded7470faef16460
> Author: Andrew Lunn <andrew@...n.ch>
> Date:   Sun Oct 4 18:12:57 2020 +0200
> 
>      net: dsa: mv88e6xxx: Add per port devlink regions
>      
>      Add a devlink region to return the per port registers.
>      
>      Signed-off-by: Andrew Lunn <andrew@...n.ch>
>      Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
>      Reviewed-by: Vladimir Oltean <olteanv@...il.com>
>      Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> 5.4 we released in 2019-11-24.
> 
> When debugging issues like this, you really should be using a modern
> kernel. At minimum 5.13, better still, net-next.

You're absolutely right. The issue is we're relying on the upstream 
socfpga Cyclone V kernel, and our custom board requires we rebase our 
local fixes.

But, you're right: using net-next is probably what I try next, if commit 
b71a8d6025 doesn't resolve this issue.

Thank you very much for all of the feedback!