netdev - Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

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Date:   Wed, 7 Jun 2017 07:16:42 +0300
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     Ilan Tayari <ilant@...lanox.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "jsorensen@...com" <jsorensen@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        Alan Tull <atull@...nsource.altera.com>,
        "yi1.li@...ux.intel.com" <yi1.li@...ux.intel.com>,
        Boris Pismenny <borisp@...lanox.com>
Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

On Tue, Jun 6, 2017 at 7:17 PM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> On Tue, Jun 06, 2017 at 06:52:15AM +0000, Ilan Tayari wrote:
>
>> So neither the host stack nor the network are aware of them.
>> They exist momentarily only on the internal traces on the board and not
>> anywhere else.
>
> Is that really true? If you are creating rocee QPs' then the RDMA
> stack sees this stuff and now we have buried a RDMA ULP inside an
> ethernet driver which seems really wonky..

It is not an ethernet driver, mlx5_core provides both RDMA and
ethernet interfaces to both mlx5_ib and the mlx5e netdevice.

so it is perfectly capable of creating QPs on its own, after all it is
the one creating QPs for the RDMA stack :).

rdma_create_qp->mlx5_ib_create_qp->mlx5_core_create_qp.


>
>> I don't mind explaining further, but I think you will just see it in the
>> patchset when we submit.
>
> You described exactly what I thought.. I just disagree with you that
> an ethernet connected and controlled IP accelerator is 'part of the
> NIC', even if it happens to be colocated on the same circuit board.
>
> Jason