netdev - Re: [PATCH net-next 1/6] ethtool: Extend link modes settings uAPI with lanes

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Message-ID: <20201019123837.GP456889@lunn.ch>
Date:   Mon, 19 Oct 2020 14:38:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Danielle Ratson <danieller@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Ido Schimmel <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...dia.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>, mlxsw <mlxsw@...dia.com>,
        Ido Schimmel <idosch@...dia.com>,
        "johannes@...solutions.net" <johannes@...solutions.net>
Subject: Re: [PATCH net-next 1/6] ethtool: Extend link modes settings uAPI
 with lanes

> >>                                 100000baseKR2/Full
> >>                                 100000baseSR2/Full
> >>                                 100000baseCR2/Full
> >>                                 100000baseLR2_ER2_FR2/Full
> >>                                 100000baseDR2/Full
> >
> >I'm not sure i fully understand all these different link modes, but i
> >thought these 5 are all 100G using 2 lanes? So why cannot the user
> >simply do
> >
> >ethtool -s swp1 advertise 100000baseKR2/Full
> >
> >and the driver can figure out it needs to use two lanes at 50G?
> 
> 100000baseKR2 is 2 lanes. No need to figure anything out. What do you
> mean by that?

I'm just thinking, rather than add a new UAPI for the number of lanes,
why not use one we already have, if the number of lanes is implied by
the link mode.

    Andrew