linux-kernel - Re: [net-next PATCH 4/5] octeontx2-pf: Add devlink support to configure TL1 RR

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Date:   Fri, 13 Jan 2023 14:19:05 +0200
From:   Maxim Mikityanskiy <maxtram95@...il.com>
To:     Hariprasad Kelam <hkelam@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        edumazet@...gle.com, sgoutham@...vell.com, lcherian@...vell.com,
        gakula@...vell.com, jerinj@...vell.com, sbhatta@...vell.com,
        Jiri Pirko <jiri@...dia.com>
Subject: Re: [net-next PATCH 4/5] octeontx2-pf: Add devlink support to
 configure TL1 RR_PRIO

On Thu, Jan 12, 2023 at 11:01:19PM +0530, Hariprasad Kelam wrote:
> All VFs and PF netdev shares same TL1 schedular, each interface
> PF or VF will have different TL2 schedulars having same parent
> TL1. The TL1 RR_PRIO value is static and PF/VFs use the same value
> to configure its TL2 node priority in case of DWRR children.
> 
> This patch adds support to configure TL1 RR_PRIO value using devlink.
> The TL1 RR_PRIO can be configured for each PF. The VFs are not allowed
> to configure TL1 RR_PRIO value. The VFs can get the RR_PRIO value from
> the mailbox NIX_TXSCH_ALLOC response parameter aggr_lvl_rr_prio.
> 
> Example command to configure TL1 RR_PRIO to 6 for PF 0002:04:00.0:
> $ devlink -p dev param set pci/0002:04:00.0 name tl1_rr_prio value 6 \
>   cmode runtime

Could you please elaborate how these priorities of Transmit Levels are
related to HTB priorities? I don't seem to understand why something has
to be configured with devlink in addition to HTB.

Also, what do MDQ and SMQ abbreviations mean?

(Ccing Jiri for devlink stuff.)

> 
> Limitations:
> 1. The RR_PRIO can only be configured before VFs are enabled
> 
> Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> ---