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

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Message-ID: <4c164e09-0103-7daf-e9f8-9260223ada08@fb.com>
Date:   Fri, 2 Jun 2017 16:31:18 -0400
From:   Jes Sorensen <jsorensen@...com>
To:     Ilan Tayari <ilant@...lanox.com>,
        Saeed Mahameed <saeedm@....mellanox.co.il>
CC:     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>,
        Kernel Team <kernel-team@...com>
Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

On 05/28/2017 03:24 AM, Ilan Tayari wrote:
>> -----Original Message-----
>> From: Jes Sorensen [mailto:jsorensen@...com]
>>
>> 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.
> 
> Jes,
> 
> It is already modular like that. See CONFIG_MLX5_FPGA.

[jes@...as netdev.git]$ grep CONFIG_MLX5_FPGA 
drivers/net/ethernet/mellanox/mlx5/core/*
[jes@...as netdev.git]$

Which git tree am I supposed to look at?

Jes