netdev - Re: [net-next Patch v2 4/5] octeontx2-pf: Add devlink support to configure TL1 RR

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Date:   Tue, 24 Jan 2023 17:26:45 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Maxim Mikityanskiy <maxtram95@...il.com>
Cc:     Hariprasad Kelam <hkelam@...vell.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Jerin Jacob Kollanukkaran <jerinj@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "jiri@...nulli.us" <jiri@...nulli.us>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "tariqt@...dia.com" <tariqt@...dia.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "hariprasad.netdev@...il.com" <hariprasad.netdev@...il.com>,
        Naveen Mamindlapalli <naveenm@...vell.com>
Subject: Re: [net-next Patch v2 4/5] octeontx2-pf: Add devlink support to
 configure TL1 RR_PRIO

On Tue, 24 Jan 2023 15:02:29 +0200 Maxim Mikityanskiy wrote:
> So, basically, in your implementation, entities prioritized by hardware
> are: each HTB class, each VF and PF; you want to keep user-assigned
> priorities for HTB classes, you want to let the user assign a priority
> for unclassified traffic, but the latter must be equal for all VFs and
> PF (for DWRR to work), correct? And that devlink command is only useful
> in the HTB scenario, i.e. it doesn't matter what tl1_rr_prio you set if
> HTB is not used, right?

To me HW this limited does not sound like a match for HTB offload.