netdev - Re: [pull request][net-next 0/3] Mellanox, mlx5 GRE tunnel offloads

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Date:   Sat, 2 Sep 2017 16:01:29 -0700
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [pull request][net-next 0/3] Mellanox, mlx5 GRE tunnel offloads

On Thu, Aug 31, 2017 at 6:51 AM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> Saeed Mahameed <saeedm@...lanox.com> writes:
>
>> The first patch from Gal and Ariel provides the mlx5 driver support for
>> ConnectX capability to perform IP version identification and matching in
>> order to distinguish between IPv4 and IPv6 without the need to specify the
>> encapsulation type, thus perform RSS in MPLS automatically without
>> specifying MPLS ethertyoe. This patch will also serve for inner GRE IPv4/6
>> classification for inner GRE RSS.
>
> I don't think this is legal at all or did I misunderstood something?
>
> <https://tools.ietf.org/html/rfc3032#section-2.2>

It seems you misunderstood the cover letter.  The HW will still
identify MPLS (IPv4/IPv6) packets using a new bit we specify in the HW
steering rules rather than adding new specific rules with  {MPLS
ethertype} X {IPv4,IPv6} to classify MPLS IPv{4,6} traffic, Same
functionality a better and general way to approach it.
Bottom line the hardware is capable of processing MPLS headers and
perform RSS on the inner packet (IPv4/6) without the need of the
driver to provide precise steering MPLS rules.

>
> Thanks,
> Hannes