linux-kernel - Re: [PATCH 00/15] Adding GAUDI NIC code to habanalabs driver

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Message-ID: <CAFCwf11P7pEJ+Av9oiwdQFor5Kh9JeKvVTBXnMzWusKCRz7mHw@mail.gmail.com>
Date:   Thu, 10 Sep 2020 23:30:33 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "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>
Subject: Re: [PATCH 00/15] Adding GAUDI NIC code to habanalabs driver

On Thu, Sep 10, 2020 at 11:25 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > Can you please elaborate on how to do this with a single driver that
> > is already in misc ?
> > As I mentioned in the cover letter, we are not developing a
> > stand-alone NIC. We have a deep-learning accelerator with a NIC
> > interface.
>
> This sounds like an MFD.
>
>      Andrew

Yes and no. There is only one functionality - training of deep
learning (Accelerating compute operations) :)
The rdma is just our method of scaling-out - our method of
intra-connection between GAUDI devices (similar to NVlink or AMD
crossfire).
So the H/W exposes a single physical function at the PCI level. And
thus Linux can call a single driver for it during the PCI probe.

I hope that in future generations we will improve that, but it is what
it is for GAUDI.
I don't see how to do it otherwise currently but if you have ideas please share.
Oded