netdev - Re: [patch net-next RFC 00/10] introduce line card support for modular switch

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Message-ID: <20210114152058.704c9f6d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 14 Jan 2021 15:20:58 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, roopa@...dia.com, mlxsw@...dia.com
Subject: Re: [patch net-next RFC 00/10] introduce line card support for
 modular switch

On Thu, 14 Jan 2021 14:58:33 -0800 Jacob Keller wrote:
> > There is no way to tell a breakout cable from normal one, so the
> > system has no chance to magically configure itself. Besides SFP
> > is just plugging a cable, not a module of the system.. 
> >   
> If you're able to tell what is plugged in, why would we want to force
> user to provision ahead of time? Wouldn't it make more sense to just
> instantiate them as the card is plugged in? I guess it might be useful
> to allow programming the netdevices before the cable is actually
> inserted... I guess I don't see why that is valuable.
> 
> It would be sort of like if you provision a PCI slot before a device is
> plugged into it..

Yup, that's pretty much my thinking as well.