netdev - Re: SRIOV switchdev mode BoF minutes

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Message-ID: <CAJ3xEMgsLTqU2WNBYNBPGuON-z7fxwHcBiooN74Fgk87g0L18A@mail.gmail.com>
Date:   Tue, 17 Apr 2018 16:58:05 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        David Miller <davem@...emloft.net>,
        Anjali Singhai Jain <anjali.singhai@...el.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Rony Efraim <ronye@...lanox.com>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: SRIOV switchdev mode BoF minutes

On Tue, Apr 17, 2018 at 4:30 PM, Andy Gospodarek
<andrew.gospodarek@...adcom.com> wrote:
> On Mon, Apr 16, 2018 at 07:08:39PM -0700, Samudrala, Sridhar wrote:
>>
>> On 4/16/2018 5:39 AM, Andy Gospodarek wrote:
>> > On Sun, Apr 15, 2018 at 09:01:16AM +0300, Or Gerlitz wrote:
>> > > On Sat, Apr 14, 2018 at 2:03 AM, Samudrala, Sridhar
>> > > <sridhar.samudrala@...el.com> wrote:
>> > >
>> > > > I meant between PFs on 2 compute nodes.
>> > > If the PF serves as uplink rep, it functions as  a switch port -- applications
>> > > don't run on switch ports. One way to get apps to run on the host in switchdev
>> > > mode is probe one of the VFs there.
>> > >
>> > >
>> > >
>> So once a pci device is configured in 'switchdev' mode,  only port representor netdevs are
>> seen on the host, no more PF netdev.
>
> That is not the functionality I would propose.  The PF netdev will still be there.

Andy,

Basically LGTM, so even in smartnic configs, the PF @ the host is
still privileged to
create/destroy VFs or provision MACs for them even if it is not the
e-switch manager
anymore?

Actually AFAIK this  can also work somehow otherwise, e.g a smartnic FW
"pushes" the VFs into the host w.o them being under a host admin directive.