netdev - RE: [PATCH net-next 12/19] devlink: Introduce mdev port flavour

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Date:   Fri, 8 Nov 2019 15:45:06 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Jiri Pirko <jiri@...nulli.us>
CC:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH net-next 12/19] devlink: Introduce mdev port flavour



> -----Original Message-----
> From: Jiri Pirko <jiri@...nulli.us>
> Sent: Friday, November 8, 2019 3:47 AM
> To: Parav Pandit <parav@...lanox.com>
> Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>;
> alex.williamson@...hat.com; davem@...emloft.net; kvm@...r.kernel.org;
> netdev@...r.kernel.org; Saeed Mahameed <saeedm@...lanox.com>;
> kwankhede@...dia.com; leon@...nel.org; cohuck@...hat.com; Jiri Pirko
> <jiri@...lanox.com>; linux-rdma@...r.kernel.org
> Subject: Re: [PATCH net-next 12/19] devlink: Introduce mdev port flavour
> 
> Fri, Nov 08, 2019 at 03:31:02AM CET, parav@...lanox.com wrote:
> >
> >
> >> -----Original Message-----
> >> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
> >> Sent: Thursday, November 7, 2019 8:20 PM
> >> To: Parav Pandit <parav@...lanox.com>
> >> Cc: alex.williamson@...hat.com; davem@...emloft.net;
> >> kvm@...r.kernel.org; netdev@...r.kernel.org; Saeed Mahameed
> >> <saeedm@...lanox.com>; kwankhede@...dia.com; leon@...nel.org;
> >> cohuck@...hat.com; Jiri Pirko <jiri@...lanox.com>; linux-
> >> rdma@...r.kernel.org
> >> Subject: Re: [PATCH net-next 12/19] devlink: Introduce mdev port
> >> flavour
> >>
> >> On Fri, 8 Nov 2019 01:44:53 +0000, Parav Pandit wrote:
> >> > > I'm talking about netlink attributes. I'm not suggesting to
> >> > > sprintf it all into the phys_port_name.
> >> > >
> >> > I didn't follow your comment. For devlink port show command output
> >> > you said,
> >> >
> >> > "Surely those devices are anchored in on of the PF (or possibly
> >> > VFs) that should be exposed here from the start."
> >> > So I was trying to explain why we don't expose PF/VF detail in the
> >> > port attributes which contains
> >> > (a) flavour
> >> > (b) netdev representor (name derived from phys_port_name)
> >> > (c) mdev alias
> >> >
> >> > Can you please describe which netlink attribute I missed?
> >>
> >> Identification of the PCI device. The PCI devices are not linked to
> >> devlink ports, so the sysfs hierarchy (a) is irrelevant, (b) may not
> >> be visible in multi- host (or SmartNIC).
> >>
> >
> >It's the unique mdev device alias. It is not right to attach to the PCI device.
> >Mdev is bus in itself where devices are identified uniquely. So an alias
> suffice that identity.
> 
> Wait a sec. For mdev, what you say is correct. But here we talk about
> devlink_port which is representing this mdev. And this devlink_port is very
> similar to VF devlink_port. It is bound to specific PF (in case of mdev it could
> be PF-VF).
>
But mdev port has unique phys_port_name in system, it incorrect to use PF/VF prefix.
What in hypothetical case, mdev is not on top of PCI...