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From: <pbhagavatula@marvell.com>
To: <jerinj@marvell.com>, <sthotton@marvell.com>,
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<peter.mccarthy@intel.com>
CC: <dev@dpdk.org>, Pavan Nikhilesh <pbhagavatula@marvell.com>
Subject: [PATCH v5 3/6] eventdev: add event preschedule hint
Date: Fri, 4 Oct 2024 21:54:48 +0530
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From: Pavan Nikhilesh <pbhagavatula@marvell.com>
Add a new eventdev API to provide a hint to the eventdev PMD to
pre-schedule the next event into the event port, without releasing
the current flow context.
Event device that support this feature advertises the capability
using the RTE_EVENT_DEV_CAP_PRESCHEDULE_EXPLICIT capability flag.
Application can invoke `rte_event_port_preschedule` to hint the PMD,
if event device does not support this feature it is treated as a no-op.
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
doc/guides/prog_guide/eventdev/eventdev.rst | 9 ++++
doc/guides/rel_notes/release_24_11.rst | 3 +-
lib/eventdev/eventdev_pmd.h | 2 +
lib/eventdev/eventdev_private.c | 21 ++++++++-
lib/eventdev/eventdev_trace_points.c | 3 ++
lib/eventdev/rte_eventdev.h | 50 +++++++++++++++++++++
lib/eventdev/rte_eventdev_core.h | 8 +++-
lib/eventdev/rte_eventdev_trace_fp.h | 8 ++++
lib/eventdev/version.map | 2 +
9 files changed, 102 insertions(+), 4 deletions(-)
diff --git a/doc/guides/prog_guide/eventdev/eventdev.rst b/doc/guides/prog_guide/eventdev/eventdev.rst
index 26e77166d5..56d62d260a 100644
--- a/doc/guides/prog_guide/eventdev/eventdev.rst
+++ b/doc/guides/prog_guide/eventdev/eventdev.rst
@@ -395,6 +395,15 @@ will be a no-op in that case.
// Disable pre-scheduling if thread is about to be scheduled out and issue dequeue() to drain
// pending events.
+Application may provide a hint to the eventdev PMD to pre-schedule the next event without
+releasing the current flow context. Event device that support this feature advertises
+the capability via the ``RTE_EVENT_DEV_CAP_PRESCHEDULE_EXPLICIT`` flag.
+If pre-scheduling is already enabled at a event device or event port level or if the
+capability is not supported then the hint is ignored.
+
+.. code-block:: c
+
+ rte_event_port_preschedule(dev_id, port_id, RTE_EVENT_PRESCHEDULE);
Starting the EventDev
~~~~~~~~~~~~~~~~~~~~~
diff --git a/doc/guides/rel_notes/release_24_11.rst b/doc/guides/rel_notes/release_24_11.rst
index cae594096c..3a41263b8b 100644
--- a/doc/guides/rel_notes/release_24_11.rst
+++ b/doc/guides/rel_notes/release_24_11.rst
@@ -64,7 +64,8 @@ New Features
level pre-scheduling type.
* Added ``rte_event_port_preschedule_modify`` to modify pre-scheduling type
on a given event port.
-
+ * Added ``rte_event_port_preschedule`` to allow applications provide explicit
+ pre-schedule hints to event ports.
Removed Items
-------------
diff --git a/lib/eventdev/eventdev_pmd.h b/lib/eventdev/eventdev_pmd.h
index 9ea23aa6cd..0bee2347ef 100644
--- a/lib/eventdev/eventdev_pmd.h
+++ b/lib/eventdev/eventdev_pmd.h
@@ -186,6 +186,8 @@ struct __rte_cache_aligned rte_eventdev {
/**< Pointer to PMD Event switch profile function. */
event_preschedule_modify_t preschedule_modify;
/**< Pointer to PMD Event port pre-schedule type modify function. */
+ event_preschedule_t preschedule;
+ /**< Pointer to PMD Event port pre-schedule 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 cc5963b31b..b628f4a69e 100644
--- a/lib/eventdev/eventdev_private.c
+++ b/lib/eventdev/eventdev_private.c
@@ -111,6 +111,19 @@ dummy_event_port_preschedule_modify_hint(
return -ENOTSUP;
}
+static void
+dummy_event_port_preschedule(__rte_unused void *port,
+ __rte_unused enum rte_event_dev_preschedule_type preschedule)
+{
+ RTE_EDEV_LOG_ERR("pre-schedule requested for unconfigured event device");
+}
+
+static void
+dummy_event_port_preschedule_hint(__rte_unused void *port,
+ __rte_unused enum rte_event_dev_preschedule_type preschedule)
+{
+}
+
void
event_dev_fp_ops_reset(struct rte_event_fp_ops *fp_op)
{
@@ -124,12 +137,12 @@ event_dev_fp_ops_reset(struct rte_event_fp_ops *fp_op)
.dequeue_burst = dummy_event_dequeue_burst,
.maintain = dummy_event_maintain,
.txa_enqueue = dummy_event_tx_adapter_enqueue,
- .txa_enqueue_same_dest =
- dummy_event_tx_adapter_enqueue_same_dest,
+ .txa_enqueue_same_dest = dummy_event_tx_adapter_enqueue_same_dest,
.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,
+ .preschedule = dummy_event_port_preschedule,
.data = dummy_data,
};
@@ -153,8 +166,12 @@ event_dev_fp_ops_set(struct rte_event_fp_ops *fp_op,
fp_op->dma_enqueue = dev->dma_enqueue;
fp_op->profile_switch = dev->profile_switch;
fp_op->preschedule_modify = dev->preschedule_modify;
+ fp_op->preschedule = dev->preschedule;
fp_op->data = dev->data->ports;
if (fp_op->preschedule_modify == NULL)
fp_op->preschedule_modify = dummy_event_port_preschedule_modify_hint;
+
+ if (fp_op->preschedule == NULL)
+ fp_op->preschedule = dummy_event_port_preschedule_hint;
}
diff --git a/lib/eventdev/eventdev_trace_points.c b/lib/eventdev/eventdev_trace_points.c
index e41674123c..e7af1591f7 100644
--- a/lib/eventdev/eventdev_trace_points.c
+++ b/lib/eventdev/eventdev_trace_points.c
@@ -52,6 +52,9 @@ RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_port_profile_switch,
RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_port_preschedule_modify,
lib.eventdev.port.preschedule.modify)
+RTE_TRACE_POINT_REGISTER(rte_eventdev_trace_port_preschedule,
+ lib.eventdev.port.preschedule)
+
/* 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 d7920bfba0..ffce2ee0d9 100644
--- a/lib/eventdev/rte_eventdev.h
+++ b/lib/eventdev/rte_eventdev.h
@@ -480,6 +480,15 @@ struct rte_event;
* @see rte_event_port_preschedule_modify()
*/
+#define RTE_EVENT_DEV_CAP_PRESCHEDULE_EXPLICIT (1ULL << 19)
+/**< Event device supports explicit prescheduling.
+ *
+ * When this flag is set, the application can issue preschedule request on
+ * a event port.
+ *
+ * @see rte_event_port_preschedule()
+ */
+
/* Event device priority levels */
#define RTE_EVENT_DEV_PRIORITY_HIGHEST 0
/**< Highest priority level for events and queues.
@@ -2983,6 +2992,47 @@ rte_event_port_preschedule_modify(uint8_t dev_id, uint8_t port_id,
return fp_ops->preschedule_modify(port, type);
}
+/**
+ * Provide a hint to the event device to pre-schedule events to event port .
+ *
+ * Hint the event device to pre-schedule events to the event port.
+ * The call doesn't not guarantee that the events will be pre-scheduleed.
+ * The call doesn't release the flow context currently held by the event port.
+ * The event device should support RTE_EVENT_DEV_CAP_PRESCHEDULE_EXPLICIT capability.
+ *
+ * When pre-scheduling is enabled at an event device/port level or if
+ * the capability is not supported, then the hint is ignored.
+ *
+ * Subsequent calls to rte_event_dequeue_burst() will dequeue the pre-schedule
+ * events but pre-schedule operation is not issued again.
+ *
+ * @param dev_id
+ * The identifier of the device.
+ * @param port_id
+ * The identifier of the event port.
+ * @param type
+ * The pre-schedule type to use on the event port.
+ */
+static inline void
+rte_event_port_preschedule(uint8_t dev_id, uint8_t port_id,
+ enum rte_event_dev_preschedule_type 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;
+ if (port == NULL)
+ return;
+#endif
+ rte_eventdev_trace_port_preschedule(dev_id, port_id, type);
+
+ fp_ops->preschedule(port, type);
+}
#ifdef __cplusplus
}
#endif
diff --git a/lib/eventdev/rte_eventdev_core.h b/lib/eventdev/rte_eventdev_core.h
index 5f4c25b1c5..2706d5e6c8 100644
--- a/lib/eventdev/rte_eventdev_core.h
+++ b/lib/eventdev/rte_eventdev_core.h
@@ -53,6 +53,10 @@ typedef int (*event_preschedule_modify_t)(void *port,
enum rte_event_dev_preschedule_type preschedule_type);
/**< @internal Modify pre-schedule type on the event port. */
+typedef void (*event_preschedule_t)(void *port,
+ enum rte_event_dev_preschedule_type preschedule_type);
+/**< @internal Issue pre-schedule on an event port. */
+
struct __rte_cache_aligned rte_event_fp_ops {
void **data;
/**< points to array of internal port data pointers */
@@ -82,7 +86,9 @@ struct __rte_cache_aligned rte_event_fp_ops {
/**< PMD Event switch profile function. */
event_preschedule_modify_t preschedule_modify;
/**< PMD Event port pre-schedule switch. */
- uintptr_t reserved[3];
+ event_preschedule_t preschedule;
+ /**< PMD Event port pre-schedule. */
+ uintptr_t reserved[2];
};
extern struct rte_event_fp_ops rte_event_fp_ops[RTE_EVENT_MAX_DEVS];
diff --git a/lib/eventdev/rte_eventdev_trace_fp.h b/lib/eventdev/rte_eventdev_trace_fp.h
index 78baed94de..8290f8a248 100644
--- a/lib/eventdev/rte_eventdev_trace_fp.h
+++ b/lib/eventdev/rte_eventdev_trace_fp.h
@@ -63,6 +63,14 @@ RTE_TRACE_POINT_FP(
rte_trace_point_emit_int(type);
)
+RTE_TRACE_POINT_FP(
+ rte_eventdev_trace_port_preschedule,
+ 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 b6d63ba576..42a5867aba 100644
--- a/lib/eventdev/version.map
+++ b/lib/eventdev/version.map
@@ -151,6 +151,8 @@ EXPERIMENTAL {
# added in 24.11
rte_event_port_preschedule_modify;
__rte_eventdev_trace_port_preschedule_modify;
+ rte_event_port_preschedule;
+ __rte_eventdev_trace_port_preschedule;
};
INTERNAL {
--
2.25.1