netdev - Re: [PATCH] hv_netvsc: update VF after name has changed.

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Date:   Tue, 26 Dec 2017 12:25:12 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org, sthemmin@...rosoft.com
Subject: Re: [PATCH] hv_netvsc: update VF after name has changed.

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Wed, 20 Dec 2017 14:33:23 -0800

> Since commit 6123c66854c1 ("netvsc: delay setup of VF device")
> the automatic bring up of the VF is delayed to allow userspace (udev)
> a chance to rename the device. This delay is problematic because
> it delays boot and may not be long enough for some cases.
> 
> Instead, use the rename can be used to trigger the next step
> in setup to happen immediately.
> 
> The VF initialization sequence now looks like:
>    * hotplug causes VF network device probe to create network device
>    * netvsc notifier joins VF with netvsc and schedules VF to be
>      setup after timer expires
>    * udev in userspace renames device
>    * if netvsc notifier detects rename, it can cancel timer
>      and do immediate setup
> 
> The delay can also be increased to allow for slower rules.
> Still need the delayed work to handle the case where rename is
> not done.
> 
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>

I'm still seriously perplexed by this whole situation.

Why can't you bring up a VF interface simply because of a text string
used to reffered to it?

If the VF interface were named "rabbit" I don't see why it can't be
brought up until it is named "tiger"

I'm not applying any patches in this area until we have a better
understanding of what the real issue is, and have a real solution
that can be applied to any other VF interface implemented in the
tree.