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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49e2792d-7580-e066-8d4e-183a9c826e68@intel.com>
Date:   Mon, 14 Nov 2022 09:31:11 -0600
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
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>,
        <anthony.l.nguyen@...el.com>, <alexandr.lobakin@...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 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.