From: "Michael S. Tsirkin" <mst@redhat.com>
To: Siwei Liu <loseweigh@gmail.com>
Cc: "Samudrala, Sridhar" <sridhar.samudrala@intel.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
Jiri Pirko <jiri@resnulli.us>,
Stephen Hemminger <stephen@networkplumber.org>,
David Miller <davem@davemloft.net>,
Netdev <netdev@vger.kernel.org>,
virtio-dev@lists.oasis-open.org, "Brandeburg,
Jesse" <jesse.brandeburg@intel.com>,
"Duyck, Alexander H" <alexander.h.duyck@intel.com>,
Jakub Kicinski <kubakici@wp.pl>
Subject: Re: [virtio-dev] Re: [PATCH v4 2/2] virtio_net: Extend virtio to use VF datapath when available
Date: Fri, 2 Mar 2018 23:31:37 +0200 [thread overview]
Message-ID: <20180302233011-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CADGSJ20w4pMetRjjGO0pEgM5ZtL0y+LtTAy-7AF5ZXaV=Ldm1g@mail.gmail.com>
On Fri, Mar 02, 2018 at 12:44:56PM -0800, Siwei Liu wrote:
> On Fri, Mar 2, 2018 at 12:10 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
> > On Fri, Mar 02, 2018 at 11:52:27AM -0800, Samudrala, Sridhar wrote:
> >>
> >>
> >> On 3/2/2018 11:41 AM, Michael S. Tsirkin wrote:
> >> > On Fri, Mar 02, 2018 at 07:26:25AM -0800, Alexander Duyck wrote:
> >> > > The design limits things to a 1:1 relationship since we just have the
> >> > > child and backup pointers, but I don't think I am seeing exception
> >> > > handling to prevent us from overwriting the child pointers so there
> >> > > may be a leak there.
> >> > >
> >> > > Thanks.
> >> > >
> >> > > - Alex
> >> > In fact maintaining a list in that case would be nicer, and
> >> > just use an arbitrary one.
> >> > E.g. one can see how a user wanting to swap device 1 for device 2
> >> > might first add device 2 with same MAC then drop device 1.
> >>
> >> It should be possible to swap VF1 with VF2 by
> >> 1.- enabling virtio link
> >> 2.- unplugging VF1
> >> 3.- plugging VF2
> >> 4.- disabling virtio link
> >>
> >
> > True, but it isn't hard to avoid breakage if user
> > swapped steps 2 and 3. No need to make it more
> > fragile that it has to be.
>
> The migration case, VF2 is associated with another PF on another
> machine (destination), I wonder how it is possible.
E.g. you want to remove the PF so you unplug the VF
then add another VF of the same PF.
> Even with local plugging of VF2 on the same PF, the MAC address
> requirement (VF1's == VF2's) would fail the MAC address assignment on
> VF2.
>
> -Siwei
Why would it fail? These are separate cards.
> >
> > --
> > MST
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org
> >
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next prev parent reply other threads:[~2018-03-02 21:31 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-01 20:08 [virtio-dev] [PATCH v4 0/2] Enable virtio_net to act as a backup for a passthru device Sridhar Samudrala
2018-03-01 20:08 ` [virtio-dev] [PATCH v4 1/2] virtio_net: Introduce VIRTIO_NET_F_BACKUP feature bit Sridhar Samudrala
2018-03-01 20:08 ` [virtio-dev] [PATCH v4 2/2] virtio_net: Extend virtio to use VF datapath when available Sridhar Samudrala
[not found] ` <20180302083605.GD2099@nanopsycho>
2018-03-02 15:26 ` [virtio-dev] " Alexander Duyck
[not found] ` <20180302162017.GG2099@nanopsycho>
2018-03-02 16:37 ` Samudrala, Sridhar
2018-03-02 17:06 ` Alexander Duyck
2018-03-02 19:42 ` Michael S. Tsirkin
2018-03-02 20:49 ` Siwei Liu
[not found] ` <20180303113120.GA3205@nanopsycho.orion>
2018-03-03 18:04 ` Alexander Duyck
[not found] ` <20180303212542.GA10132@nanopsycho.orion>
2018-03-04 0:26 ` Alexander Duyck
[not found] ` <20180304071329.GA2112@nanopsycho.orion>
2018-03-04 18:24 ` Alexander Duyck
[not found] ` <20180304185034.GE2112@nanopsycho.orion>
2018-03-04 21:54 ` Samudrala, Sridhar
2018-03-04 21:58 ` Alexander Duyck
[not found] ` <20180305092118.GG2112@nanopsycho.orion>
[not found] ` <20180305081132.72b5159f@xeon-e3>
[not found] ` <20180305223013.GA2144@nanopsycho>
2018-03-05 22:47 ` Alexander Duyck
[not found] ` <20180305191508.298bd595@xeon-e3>
2018-03-06 19:08 ` Alexander Duyck
[not found] ` <20180306225927.GB2144@nanopsycho>
2018-03-06 23:27 ` Alexander Duyck
2018-03-07 2:38 ` Michael S. Tsirkin
2018-03-07 17:50 ` Alexander Duyck
[not found] ` <20180307100630.0f7ba1df@xeon-e3>
2018-03-07 18:55 ` Alexander Duyck
2018-03-07 20:11 ` Michael S. Tsirkin
2018-03-12 18:47 ` Samudrala, Sridhar
2018-03-02 19:41 ` Michael S. Tsirkin
2018-03-02 19:52 ` Samudrala, Sridhar
2018-03-02 20:10 ` Michael S. Tsirkin
2018-03-02 20:44 ` Siwei Liu
2018-03-02 20:56 ` Samudrala, Sridhar
2018-03-02 21:33 ` Michael S. Tsirkin
2018-03-02 21:31 ` Michael S. Tsirkin [this message]
2018-03-02 22:26 ` Siwei Liu
2018-03-04 4:00 ` Michael S. Tsirkin
2018-03-02 21:11 ` Siwei Liu
2018-03-02 21:36 ` Michael S. Tsirkin
2018-03-02 23:56 ` Siwei Liu
2018-03-04 4:04 ` Michael S. Tsirkin
2018-03-12 21:53 ` Siwei Liu
2018-03-02 23:12 ` Samudrala, Sridhar
2018-03-03 0:09 ` Siwei Liu
[not found] ` <20180312201231.GA17283@nanopsycho>
2018-03-12 20:58 ` Samudrala, Sridhar
[not found] ` <20180312210812.GB17283@nanopsycho>
2018-03-14 0:36 ` Samudrala, Sridhar
2018-03-12 22:44 ` Siwei Liu
2018-03-14 0:28 ` Samudrala, Sridhar
2018-03-14 0:44 ` Michael S. Tsirkin
2018-03-14 4:50 ` Siwei Liu
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