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

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Message-ID: <20170706231550.GC24237@lunn.ch>
Date:   Fri, 7 Jul 2017 01:15:50 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Casey Leedom <leedom@...lsio.com>
Cc:     Jakub Kicinski <kubakici@...pl>,
        Dustin Byford <dustin@...ulusnetworks.com>,
        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>,
        "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>
Subject: Re: [PATCH net-next 1/3] net: ethtool: add support for forward error
 correction modes

> Even this feels too extreme for me.  I think users would hate it.  They
> did an ifup and swapped cables.  They expect the OS/Driver/Firmware
> to continue trying to honor their ifup request.

Lets take a look around at other subsystems....

What happens if you hot-unplug a SATA drive?
An MMC card?
A USB device?
A PCIe card?
A CPU?
An SDRAM?

Do you know of any subsystem that tried to keep its configuration
across a hot unplug/plug event? I suspect they all require user space
to take some action to get the newly plugged hardware into operation.

       Andrew