netdev - Re: [PATCH v3 01/10] Add auxiliary bus support

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Date:   Tue, 10 Nov 2020 09:23:10 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Parav Pandit <parav@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Takashi Iwai <tiwai@...e.de>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Doug Ledford <dledford@...hat.com>,
        Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Fred Oh <fred.oh@...ux.intel.com>,
        Parav Pandit <parav@...lanox.com>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Patil, Kiran" <kiran.patil@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Leon Romanovsky <leonro@...dia.com>
Subject: Re: [PATCH v3 01/10] Add auxiliary bus support

On Fri, Nov 06, 2020 at 07:35:37PM +0000, Mark Brown wrote:
> On Thu, Nov 05, 2020 at 08:37:14PM +0000, Parav Pandit wrote:
> 
> > > > This example describes the mlx5 PCI subfunction use case.
> > > > I didn't follow your question about 'explicit example'.
> > > > What part is missing to identify it as explicit example?
> 
> > > Specifically listing "mlx5" so if someone reading this document thinks to
> > > themselves "hey mlx5 sounds like my use case" they can go grep for that.
> 
> > Ah, I see.
> > "mlx5" is not listed explicitly, because it is not included in this patchset.
> > In various previous discussions in this thread, mlx5 subfunction use case is described that justifies the existence of the bus.
> > I will be happy to update this documentation once mlx5 subfunction will be part of kernel so that grep actually shows valid output.
> > (waiting to post them as it uses auxiliary bus :-)).
> 
> For ease of review if there's a new version it might be as well to just
> reference it anyway, hopefully the mlx5 code will be merged fairly
> quickly once the bus itself is merged.  It's probably easier all round
> than adding the reference later, it seems more likely that mlx5 will get
> merged than that it'll fall by the wayside.

Another use-case for this patch-set is going to be the habanalabs driver.
The GAUDI ASIC is a PCI H/W accelerator for deep-learning which also exposes 
network ports.We are going to use this auxiliary-bus feature to separate our 
monolithic driver into several parts that will reside in different subsystems 
and communicate between them through the bus.

Thanks,
Oded