linux-kernel - Re: [PATCH net-next 2/5] net/sched: taprio: replace tc_taprio_qopt_offload

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Message-ID: <ZHd++lqP8EQocWQC@corigine.com>
Date:   Wed, 31 May 2023 19:08:10 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Ferenc Fejes <ferenc.fejes@...csson.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Roger Quadros <rogerq@...nel.org>,
        Pranavi Somisetty <pranavi.somisetty@....com>,
        Harini Katakam <harini.katakam@....com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Jacob Keller <jacob.e.keller@...el.com>,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
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        UNGLinuxDriver@...rochip.com,
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        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        intel-wired-lan@...ts.osuosl.org,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
Subject: Re: [PATCH net-next 2/5] net/sched: taprio: replace
 tc_taprio_qopt_offload :: enable with a "cmd" enum

On Tue, May 30, 2023 at 12:19:45PM +0300, Vladimir Oltean wrote:
> Inspired from struct flow_cls_offload :: cmd, in order for taprio to be
> able to report statistics (which is future work), it seems that we need
> to drill one step further with the ndo_setup_tc(TC_SETUP_QDISC_TAPRIO)
> multiplexing, and pass the command as part of the common portion of the
> muxed structure.
> 
> Since we already have an "enable" variable in tc_taprio_qopt_offload,
> refactor all drivers to check for "cmd" instead of "enable", and reject
> every other command except "replace" and "destroy" - to be future proof.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

...

> --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c

...

> @@ -1423,6 +1423,8 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
>  
>  		mutex_unlock(&ocelot->tas_lock);
>  		return 0;
> +	} else if (taprio->cmd != TAPRIO_CMD_REPLACE) {

Hi Vladimir,

Do you need to 'mutex_unlock(&ocelot->tas_lock)' here?

> +		return -EOPNOTSUPP;
>  	}
>  
>  	ret = ocelot_port_mqprio(ocelot, port, &taprio->mqprio);

...