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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.
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