netdev - Re: [PATCH RFC russell-king 0/4] Support for RollBall 10G copper SFP modules

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Date:   Wed, 12 Aug 2020 16:20:30 +0200
From:   Marek Behún <marek.behun@....cz>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Baruch Siach <baruch@...s.co.il>,
        Chris Healy <cphealy@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH RFC russell-king 0/4] Support for RollBall 10G copper
 SFP modules

On Tue, 11 Aug 2020 16:08:09 +0100
Russell King - ARM Linux admin <linux@...linux.org.uk> wrote:

> On Tue, Aug 11, 2020 at 12:06:41AM +0200, Marek Behún wrote:
> > Hi Russell,
> > 
> > this series should apply on linux-arm git repository, on branch
> > clearfog.
> > 
> > Some internet providers are already starting to offer 2.5G copper
> > connectivity to their users. On Turris Omnia the SFP port is capable
> > of 2.5G speed, so we tested some copper SFP modules.
> > 
> > This adds support to the SFP subsystem for 10G RollBall copper
> > modules which contain a Marvell 88X3310 PHY. By default these
> > modules are configured in 10GKR only mode on the host interface,
> > and also contain some bad information in EEPROM (the extended_cc
> > byte).  
> 
> Are you sure they are 10GBASE-KR, and not 10GBASE-R ?  Please send me
> the contents of MMD 31 register 0xf001.  Also knowing MMD 1 registers
> 2 and 3 would be useful to confirm exactly which version of the PHY
> has been used.
> 
> Thanks.
> 

Russell, sorry, I meant 10gbase-r mode, this was a typo. I don't know if
the PHY supports 10gbase-kr.