netdev - RE: [PATCH net-next 2/3] devlink: Consider other controller while building phys_port

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Date:   Wed, 2 Sep 2020 04:26:12 +0000
From:   Parav Pandit <parav@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...nulli.us>
CC:     Parav Pandit <parav@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "roid@...lanox.com" <roid@...lanox.com>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>,
        Jiri Pirko <jiri@...dia.com>
Subject: RE: [PATCH net-next 2/3] devlink: Consider other controller while
 building phys_port_name



> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Wednesday, September 2, 2020 2:59 AM
> 
> On Tue, 1 Sep 2020 11:17:42 +0200 Jiri Pirko wrote:
> > >> The external PFs need to have an extra attribute with "external
> > >> enumeration" what would be used for the representor netdev name as well.
> > >>
> > >> pci/0000:00:08.0/0: type eth netdev enp0s8f0 flavour physical
> > >> pci/0000:00:08.0/1: type eth netdev enp0s8f0_pf0 flavour pcipf
> > >> pfnum 0
> > >> pci/0000:00:08.0/2: type eth netdev enp0s8f0_e0pf0 flavour pcipf
> > >> extnum 0 pfnum 0
> > >
> > >How about a prefix of "ec" instead of "e", like?
> > >pci/0000:00:08.0/2: type eth netdev enp0s8f0_ec0pf0 flavour pcipf
> > >ecnum 0 pfnum 0
> >
> > Yeah, looks fine to me. Jakub?
> 
> I don't like that local port doesn't have the controller ID.
> 
Adding controller ID to local port will change name for all non smartnic deployments that affects current vast user base :-(

> Whether PCI port is external or not is best described by a the peer relation.

How about adding an attribute something like below in addition to controller id.

$ devlink port show
pci/0000:00:08.0/1: type eth netdev enp0s8f0_pf0 flavour pcipf pfnum 0 ecnum 0 external true splitable false
                                                                                                                                                    ^^^^^^^^^^^

> Failing that, at the very least "external" should be a separate attribute/flag from
> the controller ID.
>
Ok. Looks fine to me.

Jiri?

> I didn't quite get the fact that you want to not show controller ID on the local
> port, initially.
Mainly to not_break current users.