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

[Abdullah Sevincer <abdullah.sevincer@intel.com>]

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
order.

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 {
-- 
2.25.1