netdev - Re: SRIOV switchdev mode BoF minutes

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Date:   Fri, 13 Apr 2018 16:03:55 -0700
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Or Gerlitz <gerlitz.or@...il.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 4/13/2018 1:16 PM, Or Gerlitz wrote:
> On Fri, Apr 13, 2018 at 7:49 PM, Samudrala, Sridhar
> <sridhar.samudrala@...el.com> wrote:
>> On 4/13/2018 1:57 AM, Or Gerlitz wrote:
>
>>>> in  overlay networks scheme, the uplink rep has the VTEP ip and is not connected
>>>> to the bridge, e.g you use ovs you have vf reps and vxlan ports connected
>>>> to ovs and the ip stack routes through the uplink rep
>> This changes the legacy mode behavior of configuring  vtep ip on the pf
>> netdev. How does host to host traffic expected to work when vtep ip is moved to uplink rep?
> What do you mean host to host traffic, is that two VFs on the same host?
> control plane SWs (such as OVS) don't apply encapsulation within the same host

I meant between PFs on 2 compute nodes.


>
>>>>> What about pf-rep?
>> Are you planning to create a pf-rep too? Is pf also treated similar to vf in
>> switchdev mode?
>> All pf traffic goes to pf-rep and pf-rep traffic goes to pf by default
>> without any rules programmed?
> @ the sriov switchdev ARCH level, pf/pf-rep would work indeed as you described.
>
> We will have pf rep for smartnic schemes where the the pf on the host
> is not the manager of the eswitch but rather the smartnic driver instance.
>
> on non smart env, there are some challenges to address for the pf
> nic to be fully functional for the slow path (what you described), we
> will get there down the road if there is a real need.

So on non-smart env, are you planning to only expose uplink rep and vf reps as netdevs.
By smartnic env, i guess you are referring to OVS control plane also running on the NIC.

I will look forward to your patches.

Thanks
Sridhar