netdev - Re: [PATCH net-next 1/2] ethtool: Add support for 100Gbps per lane link modes

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Message-ID: <20200611135429.GF19869@lunn.ch>
Date:   Thu, 11 Jun 2020 15:54:29 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Meir Lichtinger <meirl@...lanox.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] ethtool: Add support for 100Gbps per lane
 link modes

> > How do you know you have connected a 400000baseLR4 to a
> > 400000baseER4 with a 40Km and it is not expected to work, when looking
> > at ethtool? I assume the EEPROM contents tell you if the module is
> > LR4, ER4, or FR4?
> > 
> >       Andrew
> Correct.

Hi Meir

Do you also have patches to Ethtool to decode these bits in the SFP EEPROM?

> In addition, this is the terminology exposed in 50 Gbps and we
> followed it.

Yes, i missed the patch which added those. I would probably of
objected. But we have them now, so lets keep going. But we might want
a clear definition of when modes can be combined like this.

  Andrew