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Date:   Fri, 18 Sep 2020 15:10:03 +0300
From:   Oded Gabbay <>
Cc:     Jason Gunthorpe <>, Jakub Kicinski <>,
        "Linux-Kernel@...r. Kernel. Org" <>,, SW_Drivers <>,
        Greg Kroah-Hartman <>,
        "David S. Miller" <>,
        Andrew Lunn <>,
        Florian Fainelli <>,, Gal Pressman <>,
        Leon Romanovsky <>
Subject: Re: [PATCH v3 00/14] Adding GAUDI NIC code to habanalabs driver

On Fri, Sep 18, 2020 at 2:36 PM Gal Pressman <> wrote:
> On 17/09/2020 20:18, Jason Gunthorpe wrote:
> > On Tue, Sep 15, 2020 at 11:46:58PM +0300, Oded Gabbay wrote:
> >> infrastructure for communication between multiple accelerators. Same
> >> as Nvidia uses NVlink, we use RDMA that we have inside our ASIC.
> >> The RDMA implementation we did does NOT support some basic RDMA
> >> IBverbs (such as MR and PD) and therefore, we can't use the rdma-core
> >> library or to connect to the rdma infrastructure in the kernel.
> >
> > You can't create a parallel RDMA subsystem in netdev, or in misc, and
> > you can't add random device offloads as IOCTL to nedevs.
> >
> > RDMA is the proper home for all the networking offloads that don't fit
> > into netdev.
> >
> > EFA was able to fit into rdma-core/etc and it isn't even RoCE at
> > all. I'm sure this can too.
> Well, EFA wasn't welcomed to the RDMA subsystem with open arms ;), initially it
> was suggested to go through the vfio subsystem instead.
> I think this comes back to the discussion we had when EFA was upstreamed, which
> is what's the bar to get accepted to the RDMA subsystem.
> IIRC, what we eventually agreed on is having a userspace rdma-core provider and
> ibv_{ud,rc}_pingpong working (or just supporting one of the IB spec's QP types?).
> Does GAUDI fit these requirements? If not, should it be in a different subsystem
> or should we open the "what qualifies as an RDMA device" question again?

Hi Itay,
Please see the above comments/questions.

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