linux-kernel - Re: [RFC PATCH net-next 07/10] mlxsw: spectrum

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Date:   Tue, 9 Jun 2020 09:58:19 +0300
From:   Amit Cohen <amitc@...lanox.com>
To:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, corbet@....net,
        jiri@...lanox.com, idosch@...lanox.com, shuah@...nel.org,
        mkubecek@...e.cz, gustavo@...eddedor.com,
        cforno12@...ux.vnet.ibm.com, andrew@...n.ch,
        linux@...pel-privat.de, alexandru.ardelean@...log.com,
        ayal@...lanox.com, petrm@...lanox.com, mlxsw@...lanox.com,
        liuhangbin@...il.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC PATCH net-next 07/10] mlxsw: spectrum_ethtool: Add link
 extended state

On 07-Jun-20 21:25, Florian Fainelli wrote:
> 
> 
> On 6/7/2020 7:59 AM, Amit Cohen wrote:
>> Implement .get_down_ext_state() as part of ethtool_ops.
>> Query link down reason from PDDR register and convert it to ethtool
>> ext_state.
>>
>> In case that more information than common ext_state is provided,
>> fill ext_substate also with the appropriate value.
>>
>> Signed-off-by: Amit Cohen <amitc@...lanox.com>
>> Reviewed-by: Petr Machata <petrm@...lanox.com>
>> Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> 
> Is the firmware smart enough to report
> ETHTOOL_EXT_SUBSTATE_LT_KR_FRAME_LOCK_NOT_ACQUIRED only when using a *KR
> link mode for instance, or do you need to sanitize that against the
> supported/advertised mode?
> 

This reason can appear with copper cable or backplane. At the moment it is only supported with AN and PD modes (not Force mode).