netdev - Re: [PATCH net-next] net: ipconfig: Make device wait timeout configurable

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Date:   Wed, 20 Nov 2019 08:39:55 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     David Miller <davem@...emloft.net>
Cc:     corbet@....net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: ipconfig: Make device wait timeout
 configurable

On Tue, 19 Nov 2019 18:44:46 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> Date: Tue, 19 Nov 2019 13:06:46 +0100
> 
> > If network device drivers are using deferred probing it's possible
> > that waiting for devices to show up in ipconfig is already over,
> > when the device eventually shows up. With the new netdev_max_wait
> > kernel cmdline pataremter it's now possible to extend this time.
> > 
> > Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> 
> This is one of those "user's shouldn't have to figure this crap out"
> situations.
> 
> To me, a knob is always a step backwards, and makes Linux harder to
> use.
> 
> The irony in all of this, is that the kernel knows when this stuff is
> happening.  So the ipconfig code should be taught that drivers are
> still plugging themselves together and probing, instead of setting
> some arbitrary timeout to wait for these things to occur.

fine with, I'll have a look how to solve it taht way.

Thomas.

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