netdev - RE: [PATCH net-next 1/3] net: ethtool: add support for forward error correction modes

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Message-ID: <9BBC4E0CF881AA4299206E2E1412B6265049232F@ORSMSX102.amr.corp.intel.com>
Date:   Thu, 6 Jul 2017 22:16:08 +0000
From:   "Wyborny, Carolyn" <carolyn.wyborny@...el.com>
To:     Casey Leedom <leedom@...lsio.com>, Jakub Kicinski <kubakici@...pl>
CC:     Dustin Byford <dustin@...ulusnetworks.com>,
        Andrew Lunn <andrew@...n.ch>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linville@...driver.com" <linville@...driver.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "vidya.chowdary@...il.com" <vidya.chowdary@...il.com>,
        "olson@...ulusnetworks.com" <olson@...ulusnetworks.com>,
        Manoj Malviya <manojmalviya@...lsio.com>,
        Santosh Rastapur <santosh@...lsio.com>,
        "yuval.mintz@...gic.com" <yuval.mintz@...gic.com>,
        "odedw@...lanox.com" <odedw@...lanox.com>,
        "ariela@...lanox.com" <ariela@...lanox.com>,
        "galp@...lanox.com" <galp@...lanox.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: [PATCH net-next 1/3] net: ethtool: add support for forward
 error correction modes

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Casey Leedom
> Sent: Thursday, July 06, 2017 2:54 PM
> To: Jakub Kicinski <kubakici@...pl>
> Cc: Dustin Byford <dustin@...ulusnetworks.com>; Andrew Lunn
> <andrew@...n.ch>; Roopa Prabhu <roopa@...ulusnetworks.com>;
> davem@...emloft.net; linville@...driver.com; netdev@...r.kernel.org;
> vidya.chowdary@...il.com; olson@...ulusnetworks.com; Manoj Malviya
> <manojmalviya@...lsio.com>; Santosh Rastapur <santosh@...lsio.com>;
> yuval.mintz@...gic.com; odedw@...lanox.com; ariela@...lanox.com;
> galp@...lanox.com; Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Subject: Re: [PATCH net-next 1/3] net: ethtool: add support for forward error
> correction modes
> 
> | From: Jakub Kicinski <kubakici@...pl>
> | Sent: Thursday, July 6, 2017 12:02 PM
> |
> | IMHO if something gets replugged all the settings should be reset.
> | I feel that it's not entirely unlike replugging a USB adapter.  Perhaps
> | we should introduce some (devlink) notifications for SFP module events
> | so userspace can apply whatever static user config it has?
> 
> Absolutely a valid approach.  As are all of the ones I outlined.
> 
[..]
> As I noted in my previous letter: this is something new that we've never
> faced before with any prior networking technology.  All previous networking
> technologies had a static set of Physical Port Capabilities fixed from the
> moment a Host Diver/Firmware first see a Port.  We're now facing a situation
> where these can change dynamically from moment to moment based on what
> Transceiver Module is inserted.

Agree with your points generally, but other networking hw vendors have dealt with this since SFP variant and other modules arrived on the scene.