linux-kernel - Re: [PATCH] octeontx2-pf: devlink params support to set TL1 round robin priority

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Date: Tue, 14 May 2024 07:54:10 +0000
From: Hariprasad Kelam <hkelam@...vell.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Sunil Kovvuri Goutham
	<sgoutham@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Jerin
 Jacob <jerinj@...vell.com>, Linu Cherian <lcherian@...vell.com>,
        Subbaraya
 Sundeep Bhatta <sbhatta@...vell.com>,
        Naveen Mamindlapalli
	<naveenm@...vell.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>
Subject: Re: [PATCH] octeontx2-pf: devlink params support to set TL1 round
 robin priority



> On Mon, 13 May 2024 11:05:46 +0530 Hariprasad Kelam wrote:
> > Added support for setting or modifying transmit level (tl1) round
> > robin priority at runtime via devlink params.
> >
> > Octeontx2 and CN10K silicon's support five transmit levels (TL5 to TL1).
> > On each transmit level Hardware supports DWRR and strict priority,
> > depend on the configuration the hardware will choose the appropriate
> > method to select packets for the next level in the transmission process.
> 
> Configuring DWRR parameters seems in no way HW specific.
> Please work on extending one of the Tx scheduling APIs to express this.
>
  The driver offers per-interface DWRR params configuration with HTB offload.
  Below are example commands having different classid with same priority value

tc class add dev ethx parent 1: classid 1:1 htb rate 10Gbit prio 1 quantum 2048
tc class add dev ethx parent 1: classid 1:2 htb rate 10Gbit prio 1 quantum 3048

Due to a hardware limitation, only a single DWRR group is supported on a transmit level.
To address this for physical functions (PFs) sharing a transmit level with their virtual functions (VFs),
 a devlink option implemented to configure a priority value.

Thanks,
Hariprasad k

> pw-bot: cr