netdev - Re: [PATCH net-next 00/13] resource management using devlink reload

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Date:   Fri, 18 Nov 2022 19:31:13 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     "Saleem, Shiraz" <shiraz.saleem@...el.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "jiri@...dia.com" <jiri@...dia.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "Lobakin, Alexandr" <alexandr.lobakin@...el.com>,
        "Drewek, Wojciech" <wojciech.drewek@...el.com>,
        "Czapnik, Lukasz" <lukasz.czapnik@...el.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Ismail, Mustafa" <mustafa.ismail@...el.com>,
        "Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>,
        "Raczynski, Piotr" <piotr.raczynski@...el.com>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "Kaliszczuk, Leszek" <leszek.kaliszczuk@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH net-next 00/13] resource management using devlink reload

On Fri, Nov 18, 2022 at 02:23:50PM +0000, Saleem, Shiraz wrote:
> > Subject: Re: [PATCH net-next 00/13] resource management using devlink reload
> > 
> > On Thu, Nov 17, 2022 at 07:36:18PM -0800, Jakub Kicinski wrote:
> > > On Thu, 17 Nov 2022 19:38:48 +0200 Leon Romanovsky wrote:
> > > > I don't think that management of PCI specific parameters in devlink
> > > > is right idea. PCI has his own subsystem with rules and assumptions,
> > > > netdev shouldn't mangle them.
> > >
> > > Not netdev, devlink, which covers netdev, RDMA and others.
> > 
> > devlink is located in net/*, it is netdev.
> > Regarding RDMA, it is not fully accurate. We use devlink to convey information to
> > FW through pci device located in netdev. Some of such parameters are RDMA
> > related. However, we don't configure RDMA properties through devlink, there is a
> > special tool for that (rdmatool).
> 
> rdmatool though is usable only once the rdma driver probe() completes and the ib_device is registered.
> And cannot be used for any configurations at driver init time.

Like I said, we use devlink to configure FW and "core" device to which
ib_device is connected. We don't configure RDMA specific properties, but
only device specific ones.

> 
> Don't we already have PCI specific parameters managed through devlink today?
> 
> https://docs.kernel.org/networking/devlink/devlink-params.html
> enable_sriov
> ignore_ari
> msix_vec_per_pf_max
> msix_vec_per_pf_min
> 
> How are these in a different bracket from what Michal is trying to do? Or were these ones a bad idea in hindsight?

Yes as it doesn't belong to net/* and it exists there just because of
one reason: ability to write to FW of specific device.

At least for ARI, I don't see that bnxt driver masked ARI Extended Capability
and informed PCI subsystem about it, so PCI core will recreate device.

Thanks