netdev - Re: SRIOV switchdev mode BoF minutes

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Message-ID: <20180417165324.GK33938@C02RW35GFVH8.dhcp.broadcom.net>
Date:   Tue, 17 Apr 2018 12:53:24 -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 Tue, Apr 17, 2018 at 09:46:38AM -0700, Samudrala, Sridhar wrote:
> On 4/17/2018 7:47 AM, Andy Gospodarek wrote:
> > On Tue, Apr 17, 2018 at 04:58:05PM +0300, Or Gerlitz wrote:
> > > 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?
> > Yes, in a SmartNIC world one config we aim to have is that a host can create
> > and destroy VFs as needed.  One of the challenges is how the VF reps are
> > managed by applications in the SmartNIC when the host could make them
> > disappear.
> 
> OK. So are we saying that in 'switchdev' mode with 2 VFs and 1 uplink, the host will
> see PF netdev, 2 vf-rep netdev's corresponding to 2 VFs and 1 uplink-rep netdev.
> 
> Is PF netdev used only for the control/configure of the VFs? If it used as a datapath,
> i think we need a pf-rep netdev too.
> 

Yes, that is correct.  PF reps could be used for datapath configuration to
redirect traffic to a PF.