[PATCH V2 1/5] ethdev: add new flow action for metering and policing

[Cristian Dumitrescu <cristian.dumitrescu@intel.com>]

Metering and policing action typically sits on top of flow classification,
which is why MTR objects are enabled through a newly introduced flow
action.

The configuration of MTR objects is done in their own namespace (rte_mtr)
within the librte_ether library. The MTR object is hooked into ethdev RX
processing path using the "meter" flow action.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
---
 doc/guides/prog_guide/rte_flow.rst | 24 ++++++++++++++++++++++++
 lib/librte_ether/rte_flow.h        | 22 ++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 662a912..6b9cdc2 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -1354,6 +1354,30 @@ rule or if packets are not addressed to a VF in the first place.
    | ``vf``       | VF ID to redirect packets to   |
    +--------------+--------------------------------+
 
+Action: ``METER``
+^^^^^^^^^^^^^^^^^
+
+Applies a stage of metering and policing.
+
+The metering and policing (MTR) object has to be first created using the
+rte_mtr_create() API function. The ID of the MTR object is specified as
+action parameter. One or several meter actions can be added to the same
+flow. More than one flow can use the same MTR object through the meter
+action. The MTR object can be further updated or queried using the
+rte_mtr* API.
+
+- Non-terminating by default.
+
+.. _table_rte_flow_action_meter:
+
+.. table:: METER
+
+   +--------------+---------------+
+   | Field        | Value         |
+   +==============+===============+
+   | ``mtr_id``   | MTR object ID |
+   +--------------+---------------+
+
 Negative types
 ~~~~~~~~~~~~~~
 
diff --git a/lib/librte_ether/rte_flow.h b/lib/librte_ether/rte_flow.h
index bba6169..5569a87 100644
--- a/lib/librte_ether/rte_flow.h
+++ b/lib/librte_ether/rte_flow.h
@@ -915,6 +915,14 @@ enum rte_flow_action_type {
 	 * See struct rte_flow_action_vf.
 	 */
 	RTE_FLOW_ACTION_TYPE_VF,
+
+	/**
+	 * Traffic metering and policing (MTR).
+	 *
+	 * See struct rte_flow_action_meter.
+	 * See file rte_mtr.h for MTR object configuration.
+	 */
+	RTE_FLOW_ACTION_TYPE_METER,
 };
 
 /**
@@ -1008,6 +1016,20 @@ struct rte_flow_action_vf {
 };
 
 /**
+ * RTE_FLOW_ACTION_TYPE_METER
+ *
+ * Traffic metering and policing (MTR).
+ *
+ * Packets matched by items of this type can be either dropped or passed to the
+ * next item with their color set by the MTR object.
+ *
+ * Non-terminating by default.
+ */
+struct rte_flow_action_meter {
+	uint32_t mtr_id; /**< MTR object ID created with rte_mtr_create(). */
+};
+
+/**
  * Definition of a single action.
  *
  * A list of actions is terminated by a END action.
-- 
2.7.4