[dpdk-dev] [PATCH v2 1/2] ethdev: support query of AGE action

[Dekel Peled <dekelp@nvidia.com>]

Existing API supports AGE action to monitor the aging of a flow.
This patch implements RFC [1], introducing the response format for query
of an AGE action.
Application will be able to query the AGE action state.
The response will be returned in the format implemented here.

[1] https://mails.dpdk.org/archives/dev/2020-September/180061.html

Signed-off-by: Dekel Peled <dekelp@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 doc/guides/prog_guide/rte_flow.rst     | 17 +++++++++++++++++
 doc/guides/rel_notes/release_20_11.rst |  3 +++
 lib/librte_ethdev/rte_flow.h           | 14 ++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 119b128..4b8d033 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -2666,6 +2666,23 @@ timeout passed without any matching on the flow.
    | ``context``  | user input flow context         |
    +--------------+---------------------------------+
 
+Query structure to retrieve ageing status information of a
+shared AGE action, or a flow rule using the AGE action:
+
+.. _table_rte_flow_query_age:
+
+.. table:: AGE query
+
+   +-------------------------+-----+-----------------------------------+
+   | Field                   | I/O | Value                             |
+   +=========================+=====+===================================+
+   | ``aged``                | out | Aging timeout expired             |
+   +-------------------------+-----+-----------------------------------+
+   | ``last_hit_time_valid`` | out | ``last_hit_time`` field is valid  |
+   +-------------------------+-----+-----------------------------------+
+   | ``last_hit_time``       | out | Seconds since last traffic hit    |
+   +-------------------------+-----+-----------------------------------+
+
 Negative types
 ~~~~~~~~~~~~~~
 
diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst
index 7f9d0dd..dd77f04 100644
--- a/doc/guides/rel_notes/release_20_11.rst
+++ b/doc/guides/rel_notes/release_20_11.rst
@@ -168,6 +168,9 @@ API Changes
 
 * ethdev: ``rte_eth_rx_descriptor_done()`` API has been deprecated.
 
+* ethdev: Added struct ``rte_flow_query_age`` for use in response to query
+  of AGE action.
+
 * Renamed internal ethdev APIs:
 
   * ``_rte_eth_dev_callback_process()`` -> ``rte_eth_dev_callback_process()``
diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
index da8bfa5..1a13802 100644
--- a/lib/librte_ethdev/rte_flow.h
+++ b/lib/librte_ethdev/rte_flow.h
@@ -2130,6 +2130,7 @@ enum rte_flow_action_type {
 	 * See struct rte_flow_action_age.
 	 * See function rte_flow_get_aged_flows
 	 * see enum RTE_ETH_EVENT_FLOW_AGED
+	 * See struct rte_flow_query_age
 	 */
 	RTE_FLOW_ACTION_TYPE_AGE,
 };
@@ -2194,6 +2195,19 @@ struct rte_flow_action_age {
 };
 
 /**
+ * RTE_FLOW_ACTION_TYPE_AGE (query)
+ *
+ * Query structure to retrieve the aging status information of a
+ * shared AGE action, or a flow rule using the AGE action.
+ */
+struct rte_flow_query_age {
+	uint32_t aged:1; /**< 1 if aging timeout expired, 0 otherwise. */
+	uint32_t last_hit_time_valid:1; /**< 1 if last_hit_time value valid. */
+	uint32_t reserved:6; /**< Reserved, must be zero. */
+	uint32_t last_hit_time:24; /**< Seconds since last traffic hit. */
+};
+
+/**
  * @warning
  * @b EXPERIMENTAL: this structure may change without prior notice
  *
-- 
1.8.3.1