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: <20180222130717.GE1994@nanopsycho>
Date:   Thu, 22 Feb 2018 14:07:17 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Or Gerlitz <gerlitz.or@...il.com>
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

Thu, Feb 22, 2018 at 12:54:45PM CET, gerlitz.or@...il.com wrote:
>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.

Yes, that is correct.