[PATCH v4 2/6] eventdev: add event port pre-schedule modify

[<pbhagavatula@marvell.com>]

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

Some event devices allow pre-schedule types to be modified at
runtime on an event port.
Add `RTE_EVENT_DEV_CAP_EVENT_PER_PORT_PRESCHEDULE` capability
to indicate that the event device supports this feature.

Add `rte_event_port_preschedule_modify()` API to modify the
pre-schedule type at runtime.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 app/test/test_eventdev.c                    | 45 +++++++++++++++--
 doc/guides/prog_guide/eventdev/eventdev.rst | 12 +++++
 doc/guides/rel_notes/release_24_11.rst      |  2 +
 lib/eventdev/eventdev_pmd.h                 |  2 +
 lib/eventdev/eventdev_private.c             | 20 ++++++++
 lib/eventdev/eventdev_trace_points.c        |  3 ++
 lib/eventdev/rte_eventdev.h                 | 55 +++++++++++++++++++++
 lib/eventdev/rte_eventdev_core.h            |  6 +++
 lib/eventdev/rte_eventdev_trace_fp.h        | 11 ++++-
 lib/eventdev/version.map                    |  4 ++
 10 files changed, 154 insertions(+), 6 deletions(-)

diff --git a/app/test/test_eventdev.c b/app/test/test_eventdev.c
index d75fc8fbbc..af3ab689b5 100644
--- a/app/test/test_eventdev.c
+++ b/app/test/test_eventdev.c
@@ -1251,7 +1251,8 @@ test_eventdev_profile_switch(void)
 }
 
 static int
-preschedule_test(rte_event_dev_preschedule_type_t preschedule_type, const char *preschedule_name)
+preschedule_test(rte_event_dev_preschedule_type_t preschedule_type, const char *preschedule_name,
+	      uint8_t modify)
 {
 #define NB_EVENTS     1024
 	uint64_t start, total;
@@ -1269,7 +1270,11 @@ preschedule_test(rte_event_dev_preschedule_type_t preschedule_type, const char *
 		TEST_ASSERT(rc == 1, "Failed to enqueue event");
 	}
 
-	RTE_SET_USED(preschedule_type);
+	if (modify) {
+		rc = rte_event_port_preschedule_modify(TEST_DEV_ID, 0, preschedule_type);
+		TEST_ASSERT_SUCCESS(rc, "Failed to modify preschedule type");
+	}
+
 	total = 0;
 	while (cnt) {
 		start = rte_rdtsc_precise();
@@ -1334,13 +1339,13 @@ test_eventdev_preschedule_configure(void)
 
 	rc = preschedule_configure(RTE_EVENT_DEV_PRESCHEDULE_NONE, &info);
 	TEST_ASSERT_SUCCESS(rc, "Failed to configure eventdev");
-	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE_NONE, "RTE_EVENT_DEV_PRESCHEDULE_NONE");
+	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE_NONE, "RTE_EVENT_DEV_PRESCHEDULE_NONE", 0);
 	TEST_ASSERT_SUCCESS(rc, "Failed to test preschedule RTE_EVENT_DEV_PRESCHEDULE_NONE");
 
 	rte_event_dev_stop(TEST_DEV_ID);
 	rc = preschedule_configure(RTE_EVENT_DEV_PRESCHEDULE, &info);
 	TEST_ASSERT_SUCCESS(rc, "Failed to configure eventdev");
-	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE, "RTE_EVENT_DEV_PRESCHEDULE");
+	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE, "RTE_EVENT_DEV_PRESCHEDULE", 0);
 	TEST_ASSERT_SUCCESS(rc, "Failed to test preschedule RTE_EVENT_DEV_PRESCHEDULE");
 
 	if (info.event_dev_cap & RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE_ADAPTIVE) {
@@ -1348,7 +1353,7 @@ test_eventdev_preschedule_configure(void)
 		rc = preschedule_configure(RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE, &info);
 		TEST_ASSERT_SUCCESS(rc, "Failed to configure eventdev");
 		rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE,
-				      "RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE");
+				      "RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE", 0);
 		TEST_ASSERT_SUCCESS(
 			rc, "Failed to test preschedule RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE");
 	}
@@ -1356,6 +1361,34 @@ test_eventdev_preschedule_configure(void)
 	return TEST_SUCCESS;
 }
 
+static int
+test_eventdev_preschedule_modify(void)
+{
+	struct rte_event_dev_info info;
+	int rc;
+
+	rte_event_dev_info_get(TEST_DEV_ID, &info);
+	if ((info.event_dev_cap & RTE_EVENT_DEV_CAP_EVENT_PER_PORT_PRESCHEDULE) == 0)
+		return TEST_SKIPPED;
+
+	rc = preschedule_configure(RTE_EVENT_DEV_PRESCHEDULE_NONE, &info);
+	TEST_ASSERT_SUCCESS(rc, "Failed to configure eventdev");
+	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE_NONE, "RTE_EVENT_DEV_PRESCHEDULE_NONE", 1);
+	TEST_ASSERT_SUCCESS(rc, "Failed to test per port preschedule RTE_EVENT_DEV_PRESCHEDULE_NONE");
+
+	rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE, "RTE_EVENT_DEV_PRESCHEDULE", 1);
+	TEST_ASSERT_SUCCESS(rc, "Failed to test per port preschedule RTE_EVENT_DEV_PRESCHEDULE");
+
+	if (info.event_dev_cap & RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE_ADAPTIVE) {
+		rc = preschedule_test(RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE,
+				      "RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE", 1);
+		TEST_ASSERT_SUCCESS(
+			rc, "Failed to test per port preschedule RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE");
+	}
+
+	return TEST_SUCCESS;
+}
+
 static int
 test_eventdev_close(void)
 {
@@ -1418,6 +1451,8 @@ static struct unit_test_suite eventdev_common_testsuite  = {
 			test_eventdev_profile_switch),
 		TEST_CASE_ST(eventdev_configure_setup, NULL,
 			test_eventdev_preschedule_configure),
+		TEST_CASE_ST(eventdev_configure_setup, eventdev_stop_device,
+			test_eventdev_preschedule_modify),
 		TEST_CASE_ST(eventdev_setup_device, eventdev_stop_device,
 			test_eventdev_link),
 		TEST_CASE_ST(eventdev_setup_device, eventdev_stop_device,
diff --git a/doc/guides/prog_guide/eventdev/eventdev.rst b/doc/guides/prog_guide/eventdev/eventdev.rst
index 341b9bb2c6..2deab0333e 100644
--- a/doc/guides/prog_guide/eventdev/eventdev.rst
+++ b/doc/guides/prog_guide/eventdev/eventdev.rst
@@ -379,6 +379,18 @@ Currently, the following pre-schedule types are supported:
  * ``RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE`` - Issue pre-schedule when dequeue is issued and there are
    no forward progress constraints.
 
+To enable or disable event pre-scheduling at a given event port, the application can use
+``rte_event_port_preschedule_modify()`` API.
+
+.. code-block:: c
+
+   rte_event_port_preschedule_modify(dev_id, port_id, RTE_EVENT_DEV_PRESCHEDULE);
+   // Dequeue events from the event port with normal dequeue() function.
+   rte_event_port_preschedule_modify(dev_id, port_id, RTE_EVENT_DEV_PRESCHEDULE_NONE);
+   // Disable pre-scheduling if thread is about to be scheduled out and issue dequeue() to drain
+   // pending events.
+
+
 Starting the EventDev
 ~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/doc/guides/rel_notes/release_24_11.rst b/doc/guides/rel_notes/release_24_11.rst
index eae5cc326b..6e36ac7b7e 100644
--- a/doc/guides/rel_notes/release_24_11.rst
+++ b/doc/guides/rel_notes/release_24_11.rst
@@ -62,6 +62,8 @@ New Features
 
   * Added ``rte_event_dev_config::preschedule_type`` to configure the device
     level pre-scheduling type.
+  * Added ``rte_event_port_preschedule_modify`` to modify pre-scheduling type
+    on a given event port.
 
 
 Removed Items
diff --git a/lib/eventdev/eventdev_pmd.h b/lib/eventdev/eventdev_pmd.h
index 7a5699f14b..9ea23aa6cd 100644
--- a/lib/eventdev/eventdev_pmd.h
+++ b/lib/eventdev/eventdev_pmd.h
@@ -184,6 +184,8 @@ struct __rte_cache_aligned rte_eventdev {
 	/**< Pointer to PMD DMA adapter enqueue function. */
 	event_profile_switch_t profile_switch;
 	/**< Pointer to PMD Event switch profile function. */
+	event_preschedule_modify_t preschedule_modify;
+	/**< Pointer to PMD Event port pre-schedule type modify function.  */
 
 	uint64_t reserved_64s[3]; /**< Reserved for future fields */
 	void *reserved_ptrs[3];	  /**< Reserved for future fields */
diff --git a/lib/eventdev/eventdev_private.c b/lib/eventdev/eventdev_private.c
index 017f97ccab..dc37f736f8 100644
--- a/lib/eventdev/eventdev_private.c
+++ b/lib/eventdev/eventdev_private.c
@@ -96,6 +96,21 @@ dummy_event_port_profile_switch(__rte_unused void *port, __rte_unused uint8_t pr
 	return -EINVAL;
 }
 
+static int
+dummy_event_port_preschedule_modify(__rte_unused void *port,
+				    __rte_unused rte_event_dev_preschedule_type_t preschedule)
+{
+	RTE_EDEV_LOG_ERR("modify pre-schedule requested for unconfigured event device");
+	return -EINVAL;
+}
+
+static int
+dummy_event_port_preschedule_modify_hint(__rte_unused void *port,
+					 __rte_unused rte_event_dev_preschedule_type_t preschedule)
+{
+	return -ENOTSUP;
+}
+
 void
 event_dev_fp_ops_reset(struct rte_event_fp_ops *fp_op)
 {
@@ -114,6 +129,7 @@ event_dev_fp_ops_reset(struct rte_event_fp_ops *fp_op)
 		.ca_enqueue = dummy_event_crypto_adapter_enqueue,
 		.dma_enqueue = dummy_event_dma_adapter_enqueue,
 		.profile_switch = dummy_event_port_profile_switch,
+		.preschedule_modify = dummy_event_port_preschedule_modify,
 		.data = dummy_data,
 	};
 
@@ -136,5 +152,9 @@ event_dev_fp_ops_set(struct rte_event_fp_ops *fp_op,
 	fp_op->ca_enqueue = dev->ca_enqueue;
 	fp_op->dma_enqueue = dev->dma_enqueue;
 	fp_op->profile_switch = dev->profile_switch;
+	fp_op->preschedule_modify = dev->preschedule_modify;
 	fp_op->data = dev->data->ports;
+
+	if (fp_op->preschedule_modify == NULL)
+		fp_op->preschedule_modify = dummy_event_port_preschedule_modify_hint;
 }
diff --git a/lib/eventdev/eventdev_trace_points.c b/lib/eventdev/eventdev_trace_points.c
index 8024e07531..e41674123c 100644
--- a/lib/eventdev/eventdev_trace_points.c
+++ b/lib/eventdev/eventdev_trace_points.c
@@ -49,6 +49,9 @@ RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_maintain,
 RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_port_profile_switch,
 	lib.eventdev.port.profile.switch)
 
+RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_port_preschedule_modify,
+	lib.eventdev.port.preschedule.modify)
+
 /* Eventdev Rx adapter trace points */
 RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_eth_rx_adapter_create,
 	lib.eventdev.rx.adapter.create)
diff --git a/lib/eventdev/rte_eventdev.h b/lib/eventdev/rte_eventdev.h
index 5ea7f5a07b..0add0093ac 100644
--- a/lib/eventdev/rte_eventdev.h
+++ b/lib/eventdev/rte_eventdev.h
@@ -470,6 +470,16 @@ struct rte_event;
  * @see rte_event_dev_configure()
  */
 
+#define RTE_EVENT_DEV_CAP_EVENT_PER_PORT_PRESCHEDULE (1ULL << 18)
+/**< Event device supports event pre-scheduling per event port.
+ *
+ * When this flag is set, the event device allows controlling the event
+ * pre-scheduling at a event port granularity.
+ *
+ * @see rte_event_dev_configure()
+ * @see rte_event_port_preschedule_modify()
+ */
+
 /* Event device priority levels */
 #define RTE_EVENT_DEV_PRIORITY_HIGHEST   0
 /**< Highest priority level for events and queues.
@@ -708,18 +718,23 @@ typedef enum {
 	RTE_EVENT_DEV_PRESCHEDULE_NONE = 0,
 	/* Disable pre-schedule across the event device or on a given event port.
 	 * @ref rte_event_dev_config.preschedule_type
+	 * @ref rte_event_port_preschedule_modify()
 	 */
 	RTE_EVENT_DEV_PRESCHEDULE,
 	/* Enable pre-schedule always across the event device or a given event port.
 	 * @ref rte_event_dev_config.preschedule_type
+	 * @ref rte_event_port_preschedule_modify()
 	 * @see RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE
+	 * @see RTE_EVENT_DEV_CAP_EVENT_PER_PORT_PRESCHEDULE
 	 */
 	RTE_EVENT_DEV_PRESCHEDULE_ADAPTIVE,
 	/* Enable adaptive pre-schedule across the event device or a given event port.
 	 * Delay issuing pre-schedule until there are no forward progress constraints with
 	 * the held flow contexts.
 	 * @ref rte_event_dev_config.preschedule_type
+	 * @ref rte_event_port_preschedule_modify()
 	 * @see RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE_ADAPTIVE
+	 * @see RTE_EVENT_DEV_CAP_EVENT_PER_PORT_PRESCHEDULE
 	 */
 } rte_event_dev_preschedule_type_t;
 
@@ -2922,6 +2937,46 @@ rte_event_port_profile_switch(uint8_t dev_id, uint8_t port_id, uint8_t profile_i
 	return fp_ops->profile_switch(port, profile_id);
 }
 
+/**
+ * Change the pre-schedule type to use on an event port.
+ *
+ * This function is used to change the current pre-schedule type configured
+ * on an event port, the pre-schedule type can be set to none to disable pre-scheduling.
+ * This effects the subsequent ``rte_event_dequeue_burst`` call.
+ * The event device should support RTE_EVENT_DEV_CAP_PER_PORT_PRESCHEDULE capability.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param port_id
+ *   The identifier of the event port.
+ * @param type
+ *   The preschedule type to use on the event port.
+ * @return
+ *  - 0 on success.
+ *  - -EINVAL if *dev_id*,  *port_id*, or *type* is invalid.
+ */
+static inline int
+rte_event_port_preschedule_modify(uint8_t dev_id, uint8_t port_id,
+				  rte_event_dev_preschedule_type_t type)
+{
+	const struct rte_event_fp_ops *fp_ops;
+	void *port;
+
+	fp_ops = &rte_event_fp_ops[dev_id];
+	port = fp_ops->data[port_id];
+
+#ifdef RTE_LIBRTE_EVENTDEV_DEBUG
+	if (dev_id >= RTE_EVENT_MAX_DEVS || port_id >= RTE_EVENT_MAX_PORTS_PER_DEV)
+		return -EINVAL;
+
+	if (port == NULL)
+		return -EINVAL;
+#endif
+	rte_eventdev_trace_port_preschedule_modify(dev_id, port_id, type);
+
+	return fp_ops->preschedule_modify(port, type);
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/eventdev/rte_eventdev_core.h b/lib/eventdev/rte_eventdev_core.h
index fc8e1556ab..2275888a6b 100644
--- a/lib/eventdev/rte_eventdev_core.h
+++ b/lib/eventdev/rte_eventdev_core.h
@@ -49,6 +49,10 @@ typedef uint16_t (*event_dma_adapter_enqueue_t)(void *port, struct rte_event ev[
 typedef int (*event_profile_switch_t)(void *port, uint8_t profile);
 /**< @internal Switch active link profile on the event port. */
 
+typedef int (*event_preschedule_modify_t)(void *port,
+					  rte_event_dev_preschedule_type_t preschedule_type);
+/**< @internal Modify pre-schedule type on the event port. */
+
 struct __rte_cache_aligned rte_event_fp_ops {
 	void **data;
 	/**< points to array of internal port data pointers */
@@ -76,6 +80,8 @@ struct __rte_cache_aligned rte_event_fp_ops {
 	/**< PMD DMA adapter enqueue function. */
 	event_profile_switch_t profile_switch;
 	/**< PMD Event switch profile function. */
+	event_preschedule_modify_t preschedule_modify;
+	/**< PMD Event port pre-schedule switch. */
 	uintptr_t reserved[4];
 };
 
diff --git a/lib/eventdev/rte_eventdev_trace_fp.h b/lib/eventdev/rte_eventdev_trace_fp.h
index 04d510ad00..78baed94de 100644
--- a/lib/eventdev/rte_eventdev_trace_fp.h
+++ b/lib/eventdev/rte_eventdev_trace_fp.h
@@ -8,7 +8,7 @@
 /**
  * @file
  *
- * API for ethdev trace support
+ * API for eventdev trace support
  */
 
 #ifdef __cplusplus
@@ -54,6 +54,15 @@ RTE_TRACE_POINT_FP(
 	rte_trace_point_emit_u8(profile);
 )
 
+RTE_TRACE_POINT_FP(
+	rte_eventdev_trace_port_preschedule_modify,
+	RTE_TRACE_POINT_ARGS(uint8_t dev_id, uint8_t port_id,
+			     int type),
+	rte_trace_point_emit_u8(dev_id);
+	rte_trace_point_emit_u8(port_id);
+	rte_trace_point_emit_int(type);
+)
+
 RTE_TRACE_POINT_FP(
 	rte_eventdev_trace_eth_tx_adapter_enqueue,
 	RTE_TRACE_POINT_ARGS(uint8_t dev_id, uint8_t port_id, void *ev_table,
diff --git a/lib/eventdev/version.map b/lib/eventdev/version.map
index 4947bb4ec6..b6d63ba576 100644
--- a/lib/eventdev/version.map
+++ b/lib/eventdev/version.map
@@ -147,6 +147,10 @@ EXPERIMENTAL {
 	rte_event_port_profile_unlink;
 	rte_event_port_profile_links_get;
 	__rte_eventdev_trace_port_profile_switch;
+
+	# added in 24.11
+	rte_event_port_preschedule_modify;
+	__rte_eventdev_trace_port_preschedule_modify;
 };
 
 INTERNAL {
-- 
2.25.1