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

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Message-ID: <f47d7519-4f58-bc94-2387-20342afd91b8@fb.com>
Date:   Fri, 26 May 2017 14:31:48 -0400
From:   Jes Sorensen <jsorensen@...com>
To:     Saeed Mahameed <saeedm@....mellanox.co.il>
CC:     Ilan Tayari <ilant@...lanox.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Saeed Mahameed <saeedm@...lanox.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>
Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

On 05/26/2017 04:29 AM, Saeed Mahameed wrote:
> On Thu, May 25, 2017 at 11:48 PM, Jes Sorensen <jsorensen@...com> wrote:
>> On 05/25/2017 06:40 AM, Saeed Mahameed wrote:
> Hi Jes,
> 
> No, It is clearly stated in the commit message :
> 
> "The FPGA is a bump-on-the-wire and thus affects operation of
> the mlx5_core driver on the ConnectX ASIC."
> 
> Which means mlx5 FPGA user can only write logic which affects only
> packets going in/out
> A ConnectX chip - so it is only network stuff -.
> 
>> We have this with other devices in the kernel where a primary device driver
>> provides an interface for an additional sub-driver to access another device
>> behind it. Like bt-coexist in some of the wifi drivers allowing access to a
>> bluetooth device behind it.
> 
> Blutooth over wifi or vise versa is a very good example to what you
> are requesting.
> But, it doesn't fit to what we are trying to do here. mlx5 FGPA is a
> ConnectX card feature, not a new protocol.

In that case it would need to be an optional module that can be enabled 
or disabled at build time.

Cheers,
Jes