netdev - Re: [PATCH net-next v2 2/8] taprio: Add support for frame preemption offload

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Message-ID: <878s8lyj5x.fsf@vcostago-mobl2.amr.corp.intel.com>
Date:   Thu, 21 Jan 2021 15:17:14 -0800
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, m-karicheri2@...com, vladimir.oltean@....com,
        Jose.Abreu@...opsys.com, po.liu@....com,
        intel-wired-lan@...ts.osuosl.org, anthony.l.nguyen@...el.com,
        mkubecek@...e.cz
Subject: Re: [PATCH net-next v2 2/8] taprio: Add support for frame
 preemption offload

Jakub Kicinski <kuba@...nel.org> writes:

> On Mon, 18 Jan 2021 16:40:22 -0800 Vinicius Costa Gomes wrote:
>> Adds a way to configure which traffic classes are marked as
>> preemptible and which are marked as express.
>> 
>> Even if frame preemption is not a "real" offload, because it can't be
>> executed purely in software, having this information near where the
>> mapping of traffic classes to queues is specified, makes it,
>> hopefully, easier to use.
>> 
>> taprio will receive the information of which traffic classes are
>> marked as express/preemptible, and when offloading frame preemption to
>> the driver will convert the information, so the driver receives which
>> queues are marked as express/preemptible.
>> 
>> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
>
>> @@ -1286,13 +1289,15 @@ static int taprio_disable_offload(struct net_device *dev,
>>  	offload->enable = 0;
>>  
>>  	err = ops->ndo_setup_tc(dev, TC_SETUP_QDISC_TAPRIO, offload);
>> -	if (err < 0) {
>> +	if (err < 0)
>> +		NL_SET_ERR_MSG(extack,
>> +			       "Device failed to disable offload");
>> +
>> +	err = ops->ndo_setup_tc(dev, TC_SETUP_PREEMPT, &preempt);
>> +	if (err < 0)
>>  		NL_SET_ERR_MSG(extack,
>>  			       "Device failed to disable offload");
>
> This was meant to say something else?

Yeah, better to say which offload failed to be disabled. Will fix.


Cheers,
-- 
Vinicius