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

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Message-ID: <Y3JBaQ7+p5ncsjuW@unreal>
Date:   Mon, 14 Nov 2022 15:23:53 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     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,
        anthony.l.nguyen@...el.com, alexandr.lobakin@...el.com,
        sridhar.samudrala@...el.com, wojciech.drewek@...el.com,
        lukasz.czapnik@...el.com, shiraz.saleem@...el.com,
        jesse.brandeburg@...el.com, mustafa.ismail@...el.com,
        przemyslaw.kitszel@...el.com, piotr.raczynski@...el.com,
        jacob.e.keller@...el.com, david.m.ertman@...el.com,
        leszek.kaliszczuk@...el.com
Subject: Re: [PATCH net-next 00/13] resource management using devlink reload

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/

Thanks