netdev - Re: SRIOV switchdev mode BoF minutes

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Message-ID: <CAJ3xEMiP2my8gP+VsvGAFv9Zj=qk2iTr+BYbd=VEtRFwrG_2JA@mail.gmail.com>
Date:   Thu, 12 Apr 2018 23:20:26 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Cc:     David Miller <davem@...emloft.net>,
        Anjali Singhai Jain <anjali.singhai@...el.com>,
        Andy Gospodarek <gospo@...adcom.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 Thu, Apr 12, 2018 at 8:05 PM, Samudrala, Sridhar
<sridhar.samudrala@...el.com> wrote:
> On 11/12/2017 11:49 AM, Or Gerlitz wrote:
>>
>> Hi Dave and all,
>>
>> During and after the BoF on SRIOV switchdev mode, we came into a
>> consensus among the developers from four different HW vendors (CC
>> audience) that a correct thing to do would be to disallow any new
>> extensions to the legacy mode.
>>
>> The idea is to put focus on the new mode and not add new UAPIs and
>> kernel code which was turned to be a wrong design which does not allow
>> for properly offloading a kernel switching SW model to e-switch HW.
>>
>> We also had a good session the day after regarding alignment for the
>> representation model of the uplink (physical port) and PF/s.
>>
>> The VF representor netdevs  exist for all drivers that support the new
>> mode but the representation for the uplink and PF wasn't the same for
>> all. The decision was to represent the uplink and PFs vports in the
>> same manner done for VFs, using rep netdevs. This alignment would
>> provide a more strict and clear view of the kernel model for e-switch
>> to users and upper layer control plane SW.
>>
> I don't see any changes in the Mellanox/other drivers to move to this new
> model to enable the uplink and PF port representors, any updates?

Yeah, I am worked on that but didn't get to finalize the upstreaming
so far.  I have resumed
the work and plan uplink rep in mlx5 to replace the PF being uplink rep for 4.18

> It would be really nice to highlight the pros and cons of the old versus the
> new model.
>
> We are looking into adding switchdev support for our new 100Gb ice driver
> and could use some feedback on the direction we should be taking.

good news.

The uplink rep is clear cut that needs to be a rep device representing
the uplink just like vf
rep represents the vport toward the vf - please just do it correct
from the begining

I can spare