netdev - Re: [PATCH net-next 1/4] mlx5: Make building eswitch configurable

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Message-ID: <CALzJLG_WCiTei7CDoUCzM241gt0bSKqjGJ61ke2XbbQTOjZBkQ@mail.gmail.com>
Date:   Fri, 27 Jan 2017 20:28:20 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Or Gerlitz <gerlitz.or@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH net-next 1/4] mlx5: Make building eswitch configurable

On Fri, Jan 27, 2017 at 8:16 PM, Tom Herbert <tom@...bertland.com> wrote:
> On Fri, Jan 27, 2017 at 10:05 AM, Saeed Mahameed
> <saeedm@....mellanox.co.il> wrote:
>> On Fri, Jan 27, 2017 at 7:50 PM, Tom Herbert <tom@...bertland.com> wrote:
>>> On Fri, Jan 27, 2017 at 9:38 AM, Saeed Mahameed
>>> <saeedm@....mellanox.co.il> wrote:
>>>> On Fri, Jan 27, 2017 at 7:34 AM, Or Gerlitz <gerlitz.or@...il.com> wrote:
>>>>> On Fri, Jan 27, 2017 at 1:32 AM, Tom Herbert <tom@...bertland.com> wrote:
>>>>>> Add a configuration option (CONFIG_MLX5_CORE_ESWITCH) for controlling
>>>>>> whether the eswitch code is built. Change Kconfig and Makefile
>>>>>> accordingly.
>>>>>
>>>>> Tom, FWIW, please note that the basic e-switch functionality is needed
>>>>> also when SRIOV isn't of use, this is for a multi host configuration.
>>>>>
>>>>
>>>> Right, set_l2_table_entry@...itch.c need to be called by PF for any UC
>>>> MAC address wanted by VF or PF.
>>>> To keep one flow in the code, the implementation is done as part of eswitch.
>>>>
>>>> so in multi-host configuration (where there are 4 PFs) each PF should
>>>> invoke set_l2_table_entry_cmd  for each one of its own UC MACs.
>>>>
>>>> populating the l2 table is done using the whole eswitch event driven
>>>> mechanisms, it is not easy and IMH not right to separate eswitch
>>>> tables from l2 table (same management logic, different tables).
>>>>
>>>> Anyways as Or stated this is just an FYI, eswitch needs to be enabled
>>>> on Multi-host configuration.
>>>>
>>> What indicate a multi-host configuration?
>>
>> nothing in the driver, it is transparent.
>>
> So then we always need the eswitch code to be built even if someone
> never uses any of it?
>

yes.
but for your convenience all you need is to compile eswitch.c.
esiwtch_offoalds.c and en_rep.c can be compiled out for basic ethernet.

>>>
>>>>> Or.
>>>>>
>>>>> My WW (and same for the rest of the IL team..) has ended so I will be
>>>>> able to further look on this series and comment on Sunday.