linux-kernel - Re: [net PATCH 4/9] octeontx2-af: Remove TOS field from MKEX TX

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Date:   Wed, 17 Mar 2021 12:07:12 +0530
From:   sundeep subbaraya <sundeep.lkml@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Hariprasad Kelam <hkelam@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        lcherian@...vell.com, Geetha sowjanya <gakula@...vell.com>,
        jerinj@...vell.com, Subbaraya Sundeep <sbhatta@...vell.com>
Subject: Re: [net PATCH 4/9] octeontx2-af: Remove TOS field from MKEX TX

Hi Jakub,

On Tue, Mar 16, 2021 at 10:53 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 16 Mar 2021 14:57:08 +0530 Hariprasad Kelam wrote:
> > From: Subbaraya Sundeep <sbhatta@...vell.com>
> >
> > TOS overlaps with DMAC field in mcam search key and hence installing
> > rules for TX side are failing. Hence remove TOS field from TX profile.
>
> Could you clarify what "installing rules is failing" means?
> Return error or does not behave correctly?

Returns error. The MKEX profile can be in a way where higher layer packet fields
can overwrite lower layer packet fields in output MCAM Key. The commit
42006910 ("octeontx2-af: cleanup KPU config data") introduced TX TOS field and
it overwrites DMAC. AF driver return error when TX rule is installed
with DMAC as
match criteria since DMAC gets overwritten and cannot be supported. Layers from
lower to higher in our case:
LA - Ethernet
LB - VLAN
LC - IP
LD - TCP/UDP
and so on.

We make sure there are no overlaps between layers but TOS got added by mistake.
We will elaborate the commit description and send the next version.

Thanks,
Sundeep