Re: [PATCH v18 1/3] eventdev: add support for independent enqueue

[Jerin Jacob <jerinjacobk@gmail.com>]

On Mon, Oct 7, 2024 at 1:43 PM Abdullah Sevincer
<abdullah.sevincer@intel.com> wrote:
>
> Support for independent enqueue feature and updates Event Device
> and PMD feature list.
>
> 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.
>
> 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>
> Acked-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>

Acked-by: Jerin Jacob <jerinj@marvell.com>
Series applied to dpdk-next-net-eventdev/for-main. Thanks


> ---
>  doc/guides/eventdevs/features/default.ini   |  1 +
>  doc/guides/prog_guide/eventdev/eventdev.rst | 23 +++++++++++++++
>  doc/guides/rel_notes/release_24_11.rst      |  8 ++++++
>  lib/eventdev/rte_eventdev.h                 | 31 +++++++++++++++++++++
>  4 files changed, 63 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/prog_guide/eventdev/eventdev.rst b/doc/guides/prog_guide/eventdev/eventdev.rst
> index fb6dfce102..515744d8ec 100644
> --- a/doc/guides/prog_guide/eventdev/eventdev.rst
> +++ b/doc/guides/prog_guide/eventdev/eventdev.rst
> @@ -472,6 +472,29 @@ A flush callback can be passed to the function to handle any outstanding events.
>
>          Invocation of this API does not affect the existing port configuration.
>
> +Independent Enqueue Capability
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +This capability applies to eventdev devices that expects all forwarded events to be
> +enqueued in the same order as they are dequeued. For dropped events, their
> +releases should come at the same location as the original event was expected.
> +The eventdev device has this restriction as it uses the order to retrieve information about
> +the original event that was sent to the CPU. This contains information like atomic
> +flow ID to release the flow lock and ordered events sequence number to restore the
> +original order.
> +
> +This capability only matters to eventdevs supporting burst mode. On ports where
> +the application is going to change enqueue order,
> +``RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ`` support should be enabled.
> +
> +Example code to inform PMD that the application plans to use independent enqueue
> +order on a port:
> +
> +    .. code-block:: c
> +
> +       if (capability & RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ)
> +         port_config = port_config | RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ;
> +
>  Stopping the EventDev
>  ~~~~~~~~~~~~~~~~~~~~~
>
> diff --git a/doc/guides/rel_notes/release_24_11.rst b/doc/guides/rel_notes/release_24_11.rst
> index e0a9aa55a1..bf7b8f005c 100644
> --- a/doc/guides/rel_notes/release_24_11.rst
> +++ b/doc/guides/rel_notes/release_24_11.rst
> @@ -67,6 +67,14 @@ New Features
>
>    The new statistics are useful for debugging and profiling.
>
> +* **Updated Event Device Library for independent enqueue feature**
> +
> +  * Added support for independent enqueue feature. With this feature Eventdev
> +    supports enqueue in any order or specifically in a different order than
> +    dequeue. The feature is intended for eventdevs supporting burst mode.
> +    Applications should  use ``RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ`` to enable
> +    the feature if the capability  ``RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ`` exists.
> +
>
>  Removed Items
>  -------------
> diff --git a/lib/eventdev/rte_eventdev.h b/lib/eventdev/rte_eventdev.h
> index 08e5f9320b..73a44b2ac5 100644
> --- a/lib/eventdev/rte_eventdev.h
> +++ b/lib/eventdev/rte_eventdev.h
> @@ -446,6 +446,25 @@ 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 dequeue 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.
> + *
> + * 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 dequeued 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 +1091,18 @@ 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 {
> --
> 2.25.1
>