linux-kernel - Re: [PATCH net-next 1/3] ethtool: Add 100base-FX link mode entries

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Date:   Tue, 15 Sep 2020 18:29:22 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <f.fainelli@...il.com>,
        <hkallweit1@...il.com>, <mkubecek@...e.cz>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] ethtool: Add 100base-FX link mode entries

Andrew

On 9/15/20 3:21 PM, Andrew Lunn wrote:
> On Tue, Sep 15, 2020 at 01:17:06PM -0500, Dan Murphy wrote:
>> Add entries for the 100base-FX full and half duplex supported modes.
>>
>> $ ethtool eth0
>>          Supported ports: [ TP    MII     FIBRE ]
>>          Supported link modes:   10baseT/Half 10baseT/Full
>>                                  100baseT/Half 100baseT/Full
>>                                  100baseFX/Half 100baseFX/Full
>>          Supported pause frame use: Symmetric Receive-only
>>          Supports auto-negotiation: No
>>          Supported FEC modes: Not reported
>>          Advertised link modes:  10baseT/Half 10baseT/Full
>>                                  100baseT/Half 100baseT/Full
>>                                  100baseFX/Half 100baseFX/Full
> I thought this PHY could not switch between TP and Fibre. It has a
> strap which decides? So i would expect the supported modes to be
> either BaseT or BaseFX. Not both. Same for Advertised?
>
>         Andrew

I found that the phy-device was setting all these bits in phy_init in 
features_init.

My first pass was to clear all these bits as well because the PHY was 
still advertising these modes.

But you are right this PHY cannot switch without strapping.

I can clear these bits.

Dan