netdev - Re: SRIOV switchdev mode BoF minutes

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Message-ID: <20180417133028.GI33938@C02RW35GFVH8.dhcp.broadcom.net>
Date:   Tue, 17 Apr 2018 09:30:28 -0400
From:   Andy Gospodarek <andrew.gospodarek@...adcom.com>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Cc:     Andy Gospodarek <andrew.gospodarek@...adcom.com>,
        Or Gerlitz <gerlitz.or@...il.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 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.

> Are you going to expose another way to change sriov_num_vfs when the device is in
> 'switchdev' mode OR do we need to switch to 'legacy' mode to increase/decrease the number of
> VFs?

Since the PF netdev will not disappear, the standard ways to configure number
of VF, etc is still available.

> Even in switchdev mode, i guess it will be possible for host apps to use the IP configured
> on the uplink rep to talk externally.
> 
> In case of multiple uplinks, are you exposing one uplink-rep netdev per uplink?