[PATCH v2 1/7] eventdev: add API to get service id

[Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>]

From: Pavan Bhagavatula <pbhagavatula@caviumnetworks.com>

In case of sw event device the scheduling can be done on a service core
using the service registered at the time of probe.
This patch adds a helper function to get the service id that can be used
by the application to assign a lcore for the service to run on.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
---

v2 changes:
 - fix checkpatch issues
 - update eventdev versio map
 - fix --slcore option not removed in app/test-event-dev

 lib/librte_eventdev/rte_eventdev.c           | 17 +++++++++++++++++
 lib/librte_eventdev/rte_eventdev.h           | 22 ++++++++++++++++++++++
 lib/librte_eventdev/rte_eventdev_version.map |  1 +
 3 files changed, 40 insertions(+)

diff --git a/lib/librte_eventdev/rte_eventdev.c b/lib/librte_eventdev/rte_eventdev.c
index 378ccb5..f179aa4 100644
--- a/lib/librte_eventdev/rte_eventdev.c
+++ b/lib/librte_eventdev/rte_eventdev.c
@@ -961,6 +961,23 @@ rte_event_dequeue_timeout_ticks(uint8_t dev_id, uint64_t ns,
 }

 int
+rte_event_dev_service_id_get(uint8_t dev_id, uint32_t *service_id)
+{
+	struct rte_eventdev *dev;
+
+	RTE_EVENTDEV_VALID_DEVID_OR_ERR_RET(dev_id, -EINVAL);
+	dev = &rte_eventdevs[dev_id];
+
+	if (service_id == NULL)
+		return -EINVAL;
+
+	if (dev->data->service_inited)
+		*service_id = dev->data->service_id;
+
+	return dev->data->service_inited ? 0 : -ESRCH;
+}
+
+int
 rte_event_dev_dump(uint8_t dev_id, FILE *f)
 {
 	struct rte_eventdev *dev;
diff --git a/lib/librte_eventdev/rte_eventdev.h b/lib/librte_eventdev/rte_eventdev.h
index 1dbc872..1c1ff6b 100644
--- a/lib/librte_eventdev/rte_eventdev.h
+++ b/lib/librte_eventdev/rte_eventdev.h
@@ -1116,6 +1116,10 @@ struct rte_eventdev_data {
 	/**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
 	struct rte_event_dev_config dev_conf;
 	/**< Configuration applied to device. */
+	uint8_t service_inited;
+	/* Service initialization state */
+	uint32_t service_id;
+	/* Service ID*/

 	RTE_STD_C11
 	uint8_t dev_started : 1;
@@ -1619,6 +1623,24 @@ rte_event_port_links_get(uint8_t dev_id, uint8_t port_id,
 			 uint8_t queues[], uint8_t priorities[]);

 /**
+ * Retrieve the service ID of the event dev. If the adapter doesn't use
+ * a rte_service function, this function returns -ESRCH.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @param [out] service_id
+ *   A pointer to a uint32_t, to be filled in with the service id.
+ *
+ * @return
+ *   - 0: Success
+ *   - <0: Error code on failure, if the event dev doesn't use a rte_service
+ *   function, this function returns -ESRCH.
+ */
+int
+rte_event_dev_service_id_get(uint8_t dev_id, uint32_t *service_id);
+
+/**
  * Dump internal information about *dev_id* to the FILE* provided in *f*.
  *
  * @param dev_id
diff --git a/lib/librte_eventdev/rte_eventdev_version.map b/lib/librte_eventdev/rte_eventdev_version.map
index d555b19..59c36a0 100644
--- a/lib/librte_eventdev/rte_eventdev_version.map
+++ b/lib/librte_eventdev/rte_eventdev_version.map
@@ -53,6 +53,7 @@ DPDK_17.11 {
 	rte_event_dev_attr_get;
 	rte_event_port_attr_get;
 	rte_event_queue_attr_get;
+	rte_event_dev_service_id_get;

 	rte_event_eth_rx_adapter_create;
 	rte_event_eth_rx_adapter_free;
--
2.7.4