netdev - Re: [RFC PATCH v3 0/3] Enable virtio_net to act as a backup for a passthru device

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Message-ID: <CAJ3xEMiWUY1-zoFTJ9C9QeAGt24bVg-kKO8RkvRa8Agaf2R+0A@mail.gmail.com>
Date:   Thu, 22 Feb 2018 13:54:45 +0200
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Alexander Duyck <alexander.duyck@...il.com>,
        Jakub Kicinski <kubakici@...pl>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        Jason Wang <jasowang@...hat.com>,
        Siwei Liu <loseweigh@...il.com>
Subject: Re: [RFC PATCH v3 0/3] Enable virtio_net to act as a backup for a
 passthru device

On Thu, Feb 22, 2018 at 10:11 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> Wed, Feb 21, 2018 at 09:57:09PM CET, alexander.duyck@...il.com wrote:

>>The signaling isn't too much of an issue since we can just tweak the
>>link state of the VF or virtio manually to report the link up or down
>>prior to the hot-plug. Now that we are on the same page with the team0

> Oh, so you just do "ip link set vfrepresentor down" in the host.
> That makes sense. I'm pretty sure that this is not implemented for all
> drivers now.

mlx5 supports that, on the representor close ndo we take the VF link
operational v-link down

We should probably also put into the picture some/more aspects
from the host side of things. The provisioning of the v-switch now
have to deal with two channels going into the VM, the PV (virtio)
one and the PT (VF) one.

This should probably boil down to apply teaming/bonding between
the VF representor and a PV backend device, e.g TAP.