netdev - Re: SRIOV switchdev mode BoF minutes

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Date:   Tue, 17 Apr 2018 16:19:15 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc:     Or Gerlitz <gerlitz.or@...il.com>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.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>,
        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, 17 Apr 2018 10:47:00 -0400, Andy Gospodarek wrote:
> There is also a school of thought that the VF reps could be
> pre-allocated on the SmartNIC so that any application processing that
> traffic would sit idle when no traffic arrives on the rep, but could
> process frames that do arrive when the VFs were created on the host.
> This implementation will depend on how resources are allocated on a
> given bit of hardware, but can really work well.

+1 if there is no FW resource allocation issues IMHO it's okay to
just show all reprs for "remote PCIes (PFs and VFs)" on the SmartNIC/
controller.  The reprs should just show link down as if PCIe cable
was unpluged until host actually enables them.  

A similar issue exists on multi-host for PFs, right?  If one of the
hosts is down do we still show their PF repr?  IMHO yes.

That makes the thing looks more like a switch with cables being plugged
in and out.