From: "Elo, Matias (Nokia - FI/Espoo)" <matias.elo@nokia.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Cc: "Van Haaren, Harry" <harry.van.haaren@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] eventdev: method for finding out unlink status
Date: Tue, 31 Jul 2018 09:27:37 +0000 [thread overview]
Message-ID: <4C54AAAE-A872-47E1-B815-AF68965F9F3E@nokia.com> (raw)
In-Reply-To: <20180731083107.GA23233@jerin>
>>>>>>
>>>>>> I think the end result we're hoping for is something like pseudo code below,
>>>>>> (keep in mind that the event/sw has a service-core thread running it, so no
>>>>>> application code there):
>>>>>>
>>>>>> int worker_poll = 1;
>>>>>>
>>>>>> worker() {
>>>>>> while(worker_poll) {
>>>>>> // eventdev_dequeue_burst() etc
>>>>>> }
>>>>>> go_to_sleep(1);
>>>>>> }
>>>>>>
>>>>>> control_plane_scale_down() {
>>>>>> unlink(evdev, worker, queue_id);
>>>>>> while(unlinks_in_progress(evdev) > 0)
>>>>>> usleep(100);
>>>>>>
>>>>>> /* here we know that the unlink is complete.
>>>>>> * so we can now stop the worker from polling */
>>>>>> worker_poll = 0;
>>>>>> }
>>>>>
>>>>>
>>>>> Make sense. Instead of rte_event_is_unlink_in_progress(), How about
>>>>> adding a callback in rte_event_port_unlink() which will be called on
>>>>> unlink completion. It will reduce the need for ONE more API.
>>>>>
>>>>> Anyway it RC2 now, so we can not accept a new feature. So we will have
>>>>> time for deprecation notice.
>>>>>
>>>>
>>>> Both solutions should work but I would perhaps favor Harry's approach as it
>>>> requires less code in the application side and doesn't break backward
>>>> compatibility.
>>>
>>> OK.
>>>
>>> Does rte_event_port_unlink() returning -EBUSY will help?
>>
>> It could perhaps work. The return value becomes a bit ambiguous though. E.g. how
>> to differentiate a delayed unlink completion from a scenario where the port & queues
>> have never been linked?
>
> Based on return code?
Yes, that works. I was thinking about the complexity of the implementation as it would
have to also track the pending unlink requests. But anyway, Harry is better answering
these questions since I guess he would be implementing this.
next prev parent reply other threads:[~2018-07-31 9:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-30 6:39 Elo, Matias (Nokia - FI/Espoo)
2018-07-30 7:54 ` Jerin Jacob
2018-07-30 9:17 ` Elo, Matias (Nokia - FI/Espoo)
2018-07-30 9:29 ` Jerin Jacob
2018-07-30 9:38 ` Van Haaren, Harry
2018-07-30 10:28 ` Elo, Matias (Nokia - FI/Espoo)
2018-07-30 10:36 ` Jerin Jacob
2018-07-30 13:36 ` Elo, Matias (Nokia - FI/Espoo)
2018-07-30 14:26 ` Jerin Jacob
2018-07-31 8:09 ` Elo, Matias (Nokia - FI/Espoo)
2018-07-31 8:31 ` Jerin Jacob
2018-07-31 9:27 ` Elo, Matias (Nokia - FI/Espoo) [this message]
2018-08-08 10:05 ` Elo, Matias (Nokia - FI/Espoo)
2018-08-09 13:14 ` Van Haaren, Harry
2018-08-09 14:18 ` Jerin Jacob
2018-08-10 14:24 ` Elo, Matias (Nokia - FI/Espoo)
2018-08-10 14:52 ` Jerin Jacob
2018-08-10 16:55 ` Van Haaren, Harry
2018-08-10 17:35 ` Jerin Jacob
2018-09-05 7:49 ` Elo, Matias (Nokia - FI/Espoo)
2018-09-12 15:17 ` Van Haaren, Harry
2018-07-30 15:32 ` Liang, Ma
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