[PATCH v1 5/7] eventdev: improve function documentation for query fns

[Bruce Richardson <bruce.richardson@intel.com>]

General improvements to the doxygen docs for eventdev functions for
querying basic information:
* number of devices
* id for a particular device
* socket id of device
* capability information for a device

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/eventdev/rte_eventdev.h | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/lib/eventdev/rte_eventdev.h b/lib/eventdev/rte_eventdev.h
index 872f241df2..c57c93a22e 100644
--- a/lib/eventdev/rte_eventdev.h
+++ b/lib/eventdev/rte_eventdev.h
@@ -440,8 +440,7 @@ struct rte_event;
  */
 
 /**
- * Get the total number of event devices that have been successfully
- * initialised.
+ * Get the total number of event devices available for application use.
  *
  * @return
  *   The total number of usable event devices.
@@ -456,8 +455,10 @@ rte_event_dev_count(void);
  *   Event device name to select the event device identifier.
  *
  * @return
- *   Returns event device identifier on success.
- *   - <0: Failure to find named event device.
+ *   Event device identifier (dev_id >= 0) on success.
+ *   Negative error code on failure:
+ *   - -EINVAL - input name parameter is invalid
+ *   - -ENODEV - no event device found with that name
  */
 int
 rte_event_dev_get_dev_id(const char *name);
@@ -470,7 +471,8 @@ rte_event_dev_get_dev_id(const char *name);
  * @return
  *   The NUMA socket id to which the device is connected or
  *   a default of zero if the socket could not be determined.
- *   -(-EINVAL)  dev_id value is out of range.
+ *   -EINVAL on error, where the given dev_id value does not
+ *   correspond to any event device.
  */
 int
 rte_event_dev_socket_id(uint8_t dev_id);
@@ -539,18 +541,20 @@ struct rte_event_dev_info {
 };
 
 /**
- * Retrieve the contextual information of an event device.
+ * Retrieve details of an event device's capabilities and configuration limits.
  *
  * @param dev_id
  *   The identifier of the device.
  *
  * @param[out] dev_info
  *   A pointer to a structure of type *rte_event_dev_info* to be filled with the
- *   contextual information of the device.
+ *   information about the device's capabilities.
  *
  * @return
- *   - 0: Success, driver updates the contextual information of the event device
- *   - <0: Error code returned by the driver info get function.
+ *   - 0: Success, information about the event device is present in dev_info.
+ *   - <0: Failure, error code returned by the function.
+ *     - -EINVAL - invalid input parameters, e.g. incorrect device id
+ *     - -ENOTSUP - device does not support returning capabilities information
  */
 int
 rte_event_dev_info_get(uint8_t dev_id, struct rte_event_dev_info *dev_info);
-- 
2.40.1