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

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Date:   Mon, 14 Nov 2022 16:58:57 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "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>,
        "Saleem, Shiraz" <shiraz.saleem@...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>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "Kaliszczuk, Leszek" <leszek.kaliszczuk@...el.com>
Subject: RE: [PATCH net-next 00/13] resource management using devlink reload



> -----Original Message-----
> From: Samudrala, Sridhar <sridhar.samudrala@...el.com>
> Sent: Monday, November 14, 2022 7:31 AM
> To: Leon Romanovsky <leon@...nel.org>; Michal Swiatkowski
> <michal.swiatkowski@...ux.intel.com>
> Cc: netdev@...r.kernel.org; davem@...emloft.net; kuba@...nel.org;
> pabeni@...hat.com; edumazet@...gle.com; intel-wired-lan@...ts.osuosl.org;
> 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>;
> Saleem, Shiraz <shiraz.saleem@...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>
> Subject: Re: [PATCH net-next 00/13] resource management using devlink reload
> 
> On 11/14/2022 7:23 AM, Leon Romanovsky wrote:
> > On Mon, Nov 14, 2022 at 01:57:42PM +0100, Michal Swiatkowski wrote:
> >> Currently the default value for number of PF vectors is number of CPUs.
> >> Because of that there are cases when all vectors are used for PF
> >> and user can't create more VFs. It is hard to set default number of
> >> CPUs right for all different use cases. Instead allow user to choose
> >> how many vectors should be used for various features. After implementing
> >> subdevices this mechanism will be also used to set number of vectors
> >> for subfunctions.
> >>
> >> The idea is to set vectors for eth or VFs using devlink resource API.
> >> New value of vectors will be used after devlink reinit. Example
> >> commands:
> >> $ sudo devlink resource set pci/0000:31:00.0 path msix/msix_eth size 16
> >> $ sudo devlink dev reload pci/0000:31:00.0
> >> After reload driver will work with 16 vectors used for eth instead of
> >> num_cpus.
> > By saying "vectors", are you referring to MSI-X vectors?
> > If yes, you have specific interface for that.
> > https://lore.kernel.org/linux-pci/20210314124256.70253-1-leon@kernel.org/
> 
> This patch series is exposing a resources API to split the device level MSI-X vectors
> across the different functions supported by the device (PF, RDMA, SR-IOV VFs
> and
> in future subfunctions). Today this is all hidden in a policy implemented within
> the PF driver.
> 
> The patch you are referring to seems to be providing an interface to change the
> msix count for a particular VF. This patch is providing a interface to set the total
> msix count for all the possible VFs from the available device level pool of
> msix-vectors.
> 

It looks like we should implement both: resources to configure the "pool" of available vectors for each VF, and the sysfs VF Interface to allow configuring individual VFs.

Thanks,
Jake