netdev - Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when available

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Message-ID: <20171219104159.30d9caaf@xeon-e3>
Date:   Tue, 19 Dec 2017 10:41:59 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     David Miller <davem@...emloft.net>
Cc:     sridhar.samudrala@...el.com, mst@...hat.com,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        alexander.duyck@...il.com, jesse.brandeburg@...el.com
Subject: Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when
 available

On Tue, 19 Dec 2017 13:21:17 -0500 (EST)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <stephen@...workplumber.org>
> Date: Tue, 19 Dec 2017 09:55:48 -0800
> 
> > could be 10ms, just enough to let udev do its renaming  
> 
> Please, move to some kind of notification or event based handling of
> this problem.
> 
> No delay is safe, what if userspace gets swapped out or whatever
> else might make userspace stall unexpectedly?
> 

The plan is to remove the delay and do the naming in the kernel.
This was suggested by Lennart since udev is only doing naming policy
because kernel names were not repeatable.

This makes the VF show up as "ethN_vf" on Hyper-V which is user friendly.

Patch is pending.