Re: [PATCH v8 2/3] eventdev: add support for independent enqueue

["Mattias Rönnblom" <hofors@lysator.liu.se>]

On 2024-08-24 22:41, Pathak, Pravin wrote:
> 
> 
>> -----Original Message-----
>> From: Mattias Rönnblom <hofors@lysator.liu.se>
>> Sent: Friday, August 23, 2024 7:03 AM
>> To: Sevincer, Abdullah <abdullah.sevincer@intel.com>; dev@dpdk.org
>> Cc: jerinj@marvell.com; Richardson, Bruce <bruce.richardson@intel.com>;
>> Pathak, Pravin <pravin.pathak@intel.com>; mattias.ronnblom@ericsson.com;
>> Aggarwal, Manish <manish.aggarwal@intel.com>
>> Subject: Re: [PATCH v8 2/3] eventdev: add support for independent enqueue
>>
>> On 2024-08-12 22:00, Abdullah Sevincer wrote:
>>> This commit adds support for independent enqueue feature and updates
>>> Event Device and PMD feature list.
>>>
>>> A new capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ is introduced to
>>> support independent enqueue to support PMD to enqueue in any order
>>> even the underlined hardware device needs enqueues in a strict dequeue
>>
>> This sentence needs to be rephrased.
>>
>> My attempt:
>> "A new capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ is introduced. An
>> application may, on an event device where independent enqueue is supported,
>> using an event port where it is enabled, enqueue RTE_EVENT_OP_FORWARD or
>> RELEASE type events in any order."
>>
>>> order.
> 
> Will this work:
> A new capability, RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ, is introduced. It
> allows out-of-order enqueuing of RTE_EVENT_OP_FORWARD or RELEASE type
> events on an event port where this capability is enabled.
> 

Sounds good and better than my attempt.

>>>
>>> To use this capability applications need to set flag
>>> RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ during port setup only if the
>>> capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ exists.
>>>
>>> Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
>>> ---
>>>    doc/guides/eventdevs/features/default.ini |  1 +
>>>    doc/guides/eventdevs/features/dlb2.ini    |  1 +
>>>    doc/guides/rel_notes/release_24_11.rst    |  5 +++
>>>    lib/eventdev/rte_eventdev.h               | 37 +++++++++++++++++++++++
>>>    4 files changed, 44 insertions(+)
>>>
>>> diff --git a/doc/guides/eventdevs/features/default.ini
>>> b/doc/guides/eventdevs/features/default.ini
>>> index 1cc4303fe5..7c4ee99238 100644
>>> --- a/doc/guides/eventdevs/features/default.ini
>>> +++ b/doc/guides/eventdevs/features/default.ini
>>> @@ -22,6 +22,7 @@ carry_flow_id              =
>>>    maintenance_free           =
>>>    runtime_queue_attr         =
>>>    profile_links              =
>>> +independent_enq            =
>>>
>>>    ;
>>>    ; Features of a default Ethernet Rx adapter.
>>> diff --git a/doc/guides/eventdevs/features/dlb2.ini
>>> b/doc/guides/eventdevs/features/dlb2.ini
>>> index 7b80286927..c7193b47c1 100644
>>> --- a/doc/guides/eventdevs/features/dlb2.ini
>>> +++ b/doc/guides/eventdevs/features/dlb2.ini
>>> @@ -15,6 +15,7 @@ implicit_release_disable   = Y
>>>    runtime_port_link          = Y
>>>    multiple_queue_port        = Y
>>>    maintenance_free           = Y
>>> +independent_enq            = Y
>>>
>>>    [Eth Rx adapter Features]
>>>
>>> diff --git a/doc/guides/rel_notes/release_24_11.rst
>>> b/doc/guides/rel_notes/release_24_11.rst
>>> index f0ec07c263..04f389876a 100644
>>> --- a/doc/guides/rel_notes/release_24_11.rst
>>> +++ b/doc/guides/rel_notes/release_24_11.rst
>>> @@ -30,6 +30,11 @@ New Features
>>>      ``RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ`` to enable the feature if the
>> capability
>>>      ``RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ`` exists.
>>>
>>> +* **Updated Event Device Library for independent enqueue feature**
>>> +
>>> +  * Added support for independent enqueue feature. Updated Event Device
>> and
>>> +    PMD feature list.
>>> +
>>>
>>>    Removed Items
>>>    -------------
>>> diff --git a/lib/eventdev/rte_eventdev.h b/lib/eventdev/rte_eventdev.h
>>> index 08e5f9320b..48e6eadda9 100644
>>> --- a/lib/eventdev/rte_eventdev.h
>>> +++ b/lib/eventdev/rte_eventdev.h
>>> @@ -446,6 +446,31 @@ struct rte_event;
>>>     * @see RTE_SCHED_TYPE_PARALLEL
>>>     */
>>>
>>> +#define RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ  (1ULL << 16) /**< Event
>>> +device is capable of independent enqueue.
>>> + * A new capability, RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ, will indicate
>>> +that Eventdev
>>> + * supports the enqueue in any order or specifically in a different
>>> +order than the
>>> + * dequeue. Eventdev PMD can either transmit events in the changed
>>> +order in which
>>> + * they are enqueued or restore the original order before sending
>>> +them to the
>>> + * underlying hardware device. A flag is provided during the port
>>> +configuration to
>>> + * inform Eventdev PMD that the application intends to use an
>>> +independent enqueue
>>> + * order on a particular port. Note that this capability only matters
>>> +for Eventdevs
>>> + * supporting burst mode.
>>> + *
>>> + * To Inform PMD that the application plans to use independent
>>> +enqueue order on a port
>>> + * this code example can be used:
>>> + *
>>> + *  if (capability & RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ)
>>> + *     port_config = port_config |
>> RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ;
>>> + *
>>> + * When an implicit release is enabled on a port, Eventdev PMD will
>>> +also handle
>>> + * the insertion of RELEASE events in place of dropped events. The
>>> +independent enqueue
>>> + * feature only applies to FORWARD and RELEASE events. New events
>>> +(op=RTE_EVENT_OP_NEW)
>>> + * will be transmitted in the order the application enqueues them and
>>> +do not maintain
>>> + * any order relative to FORWARD/RELEASE events. FORWARD vs NEW
>>> +relaxed ordering
>>> + * only applies to ports that have enabled independent enqueue feature.
>>> + */
>>> +
>>>    /* Event device priority levels */
>>>    #define RTE_EVENT_DEV_PRIORITY_HIGHEST   0
>>>    /**< Highest priority level for events and queues.
>>> @@ -1072,6 +1097,18 @@ rte_event_queue_attr_set(uint8_t dev_id, uint8_t
>> queue_id, uint32_t attr_id,
>>>     *
>>>     *  @see rte_event_port_setup()
>>>     */
>>> + #define RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ   (1ULL << 5)
>>> +/**< Flag to enable independent enqueue. Must not be set if the
>>> +device
>>> + * is not RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ capable. This feature
>>> + * allows an application to enqueue RTE_EVENT_OP_FORWARD or
>>> + * RTE_EVENT_OP_RELEASE in an order different than the order the
>>> + * events were dequeued from the event device, while maintaining
>>> + * RTE_SCHED_TYPE_ATOMIC or RTE_SCHED_TYPE_ORDERED semantics.
>>> + *
>>> + * Note that this flag only matters for Eventdevs supporting burst mode.
>>> + *
>>> + *  @see rte_event_port_setup()
>>> + */
>>>
>>>    /** Event port configuration structure */
>>>    struct rte_event_port_conf {
>>
>> Acked-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>