netdev - Re: SRIOV switchdev mode BoF minutes

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Date:   Mon, 16 Apr 2018 19:08:39 -0700
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>,
        Or Gerlitz <gerlitz.or@...il.com>
Cc:     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 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.

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?

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?