[RFC 2/2] ethdev: queue-based flow aged report

[Jack Min]

On 5/31/22 00:42, Thomas Monjalon wrote:
> 07/04/2022 07:30, Xiaoyu Min:
>> When application use queue-based flow management and operate the same
>> flow on the same queue, e.g create/destroy/query, API for querying aged
>> flows should also with queue id parameter just like other queue-based
>> flow APIs.
> A verb is missing, I am not sure to understand.
Ok, I'll re-phrase this.
>
>> By this way, PMD can work in more optimized way since resources are
>> isolated by queue and needn't synchronize.
>>
>> If application do use queue-based flow management but configure port
>> without RTE_FLOW_PORT_FLAG_STRICT_QUEUE, which means application operate
>> the same flow on different queues, the queue id parameter will
>> be ignored.
>>
>> Signed-off-by: Xiaoyu Min<jackmin at nvidia.com>
>> ---
>>   doc/guides/prog_guide/rte_flow.rst |  4 +++
>>   lib/ethdev/rte_flow.h              | 44 ++++++++++++++++++++++++++++++
>>   lib/ethdev/rte_flow_driver.h       |  7 +++++
>>   3 files changed, 55 insertions(+)
>>
>> diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
>> index 588914b231..d540152d74 100644
>> --- a/doc/guides/prog_guide/rte_flow.rst
>> +++ b/doc/guides/prog_guide/rte_flow.rst
>> @@ -2963,6 +2963,10 @@ Set ageing timeout configuration to a flow.
>>   Event RTE_ETH_EVENT_FLOW_AGED will be reported if
>>   timeout passed without any matching on the flow.
>>   
>> +If queue-based flow rule management is used, when this
>> +even is triggered, the ret_param is set to corresponding
>> +flow queue.
>> +
>>   .. _table_rte_flow_action_age:
>>   
>>   .. table:: AGE
>> diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
>> index 578dd837f5..9394fb6965 100644
>> --- a/lib/ethdev/rte_flow.h
>> +++ b/lib/ethdev/rte_flow.h
>>    * The flow context and the flow handle will be reported by the
>>    * rte_flow_get_aged_flows API.
>> + *
>> + * If queue-based flow rule management is used and port configured with
>> + * flag RTE_FLOW_PORT_FLAG_STRICT_QUEUE, RTE_ETH_EVENT_FLOW_AGED event
>> + * is triggered with ret_param set to the corresponding flow queue when
>> + * a flow queue detects new aged-out flows.
> Are you sure it is a good idea to use ret_param for such data?

Well, it seems the only way to add queue information without add/change 
APIs.

> ret_param of an event is supposed to be used by the driver
> to get a confirmation from the application.
>
> If the application needs extra info of an event,
> it is better to do a separate query like rte_flow_get_aged_flows().

Ok, since the *ret_param* is supposed to be used by driver, then the 
above approach is not a good idea.

So we need a new API, something like rte_flow_get_aged_event_queues(), 
which will return

all flow queues which has the aged flows, right?

-Jack

>
>
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