[dpdk-dev] [PATCH v3 3/5] eventdev/rx_adapter: introduce per queue event buffer

[Naga Harish K S V <s.v.naga.harish.k@intel.com>]

To configure per queue event buffer size, application sets
``rte_event_eth_rx_adapter_params::use_queue_event_buf`` flag
as true and is passed to ``rte_event_eth_rx_adapter_create_with_params``
api.

The per queue event buffer size is populated  in
``rte_event_eth_rx_adapter_queue_conf::event_buf_size`` and passed
to ``rte_event_eth_rx_adapter_queue_add`` api.

Signed-off-by: Naga Harish K S V <s.v.naga.harish.k@intel.com>
---
 .../prog_guide/event_ethernet_rx_adapter.rst  | 19 ++++++++++++-------
 lib/eventdev/rte_event_eth_rx_adapter.h       |  4 ++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
index dd753613bd..e73ae135d5 100644
--- a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
+++ b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
@@ -62,12 +62,14 @@ service function and needs to create an event port for it. The callback is
 expected to fill the ``struct rte_event_eth_rx_adapter_conf structure``
 passed to it.
 
-If the application desires to control the event buffer size, it can use the
-``rte_event_eth_rx_adapter_create_with_params()`` api. The event buffer size is
-specified using ``struct rte_event_eth_rx_adapter_params::event_buf_size``.
-The function is passed the event device to be associated with the adapter
-and port configuration for the adapter to setup an event port if the
-adapter needs to use a service function.
+If the application desires to control the event buffer size at adapter level,
+it can use the ``rte_event_eth_rx_adapter_create_with_params()`` api. The event
+buffer size is specified using ``struct rte_event_eth_rx_adapter_params::
+event_buf_size``. To configure the event buffer size at queue level, the boolean
+flag ``struct rte_event_eth_rx_adapter_params::use_queue_event_buf`` need to be
+set to true. The function is passed the event device to be associated with
+the adapter and port configuration for the adapter to setup an event port
+if the adapter needs to use a service function.
 
 Adding Rx Queues to the Adapter Instance
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -79,7 +81,9 @@ parameter. Event information for packets from this Rx queue is encoded in the
 ``ev`` field of ``struct rte_event_eth_rx_adapter_queue_conf``. The
 servicing_weight member of the struct  rte_event_eth_rx_adapter_queue_conf
 is the relative polling frequency of the Rx queue and is applicable when the
-adapter uses a service core function.
+adapter uses a service core function. The applications can configure queue
+event buffer size in ``struct rte_event_eth_rx_adapter_queue_conf::event_buf_size``
+parameter.
 
 .. code-block:: c
 
@@ -90,6 +94,7 @@ adapter uses a service core function.
         queue_config.rx_queue_flags = 0;
         queue_config.ev = ev;
         queue_config.servicing_weight = 1;
+        queue_config.event_buf_size = 1024;
 
         err = rte_event_eth_rx_adapter_queue_add(id,
                                                 eth_dev_id,
diff --git a/lib/eventdev/rte_event_eth_rx_adapter.h b/lib/eventdev/rte_event_eth_rx_adapter.h
index 6e8b3085f8..8e341b8bc8 100644
--- a/lib/eventdev/rte_event_eth_rx_adapter.h
+++ b/lib/eventdev/rte_event_eth_rx_adapter.h
@@ -199,6 +199,8 @@ struct rte_event_eth_rx_adapter_queue_conf {
 	 * Valid when RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR flag is set in
 	 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags.
 	 */
+	uint16_t event_buf_size;
+	/**< event buffer size for this queue */
 };
 
 /**
@@ -266,6 +268,8 @@ struct rte_event_eth_rx_adapter_params {
 	 * This value is rounded up for better buffer utilization
 	 * and performance.
 	 */
+	bool use_queue_event_buf;
+	/**< flag to indicate that event buffer is separate for each queue */
 };
 
 /**
-- 
2.25.1