linux-kernel - Re: [PATCH v3 00/14] Adding GAUDI NIC code to habanalabs driver

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Message-ID: <CAFCwf137pgTewcn4DwPwYRPwZARusD_5OW8OVyBPXZTyjw2KHA@mail.gmail.com>
Date:   Fri, 18 Sep 2020 15:01:08 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, SW_Drivers <SW_Drivers@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v3 00/14] Adding GAUDI NIC code to habanalabs driver

On Fri, Sep 18, 2020 at 3:00 PM Jason Gunthorpe <jgg@...dia.com> wrote:
>
>
> On Tue, Sep 15, 2020 at 08:10:08PM +0300, Oded Gabbay wrote:
> > Hello,
> >
> > This is the second version of the patch-set to upstream the GAUDI NIC code
> > into the habanalabs driver.
> >
> > The only modification from v2 is in the ethtool patch (patch 12). Details
> > are in that patch's commit message.
> >
> > Link to v2 cover letter:
> > https://lkml.org/lkml/2020/9/12/201
>
> >1. The NIC functionality is NOT exposed as different PCI Physical
> >   Functions. There is a single PF which is used for compute and
> >   networking, as the main goal of the NIC ports is to be used as
> >   intra-communication and not as standard network interfaces. This
> >   implies we can't connect different drivers to handle the networking
> >   ports because it is the same device, from the kernel POV, as the
> >   compute. Therefore, we must integrate the networking code into the
> >   main habanalabs driver.
>
> No, this means you need to use virtual bus/ancillary bus that your
> other Intel colleagues have been working on with Greg.
>
> It is specificaly intended as the way to split a single PCI function
> across multiple subsystems. eg drivers/misc/habanalabs would be the
> pci_driver and drivers/net/ethernet/habanadalabs would be the
> 'virtual/ancillary' driver. Probably one per port.
>
> Jasno

Understood.
We are doing a refactor of the code according to those guidelines and
will send an updated patch-set in a couple of weeks.
Thanks,
Oded