[PATCH v4 1/6] ethdev: Add tunnel encap/decap actions

[Declan Doherty <declan.doherty@intel.com>]

Add new flow action types and associated action data structure to
support the encapsulation and decapsulation of VXLAN/NVGRE tunnel
endpoints.

The RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP or
RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP actions will cause the matching
flow to be encapsulated in the tunnel endpoint overlay
defined in the rte_flow_action_tunnel_encap action definition.

The RTE_FLOW_ACTION_TYPE_VXLAN_DECAP and
RTE_FLOW_ACTION_TYPE_NVGRE_DECAP actions will cause all headers
associated with the outermost VXLAN/NVGRE tunnel overlay to be
decapsulated from the matching flow.

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
---
 doc/guides/prog_guide/rte_flow.rst | 89 ++++++++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_flow.h        | 67 +++++++++++++++++++++++++++-
 2 files changed, 155 insertions(+), 1 deletion(-)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 961943dda..672473d33 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -1486,6 +1486,95 @@ fields in the pattern items.
    | 1     | END      |
    +-------+----------+
 
+Action: ``VXLAN_ENCAP``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Performs a VXLAN encapsulation action by encapsulating the matched flow in the
+VXLAN tunnel as defined in the``rte_flow_action_tunnel_encap`` flow items
+definition.
+
+This action modifies the payload of matched flows. The flow definition specified
+in the ``rte_flow_action_tunnel_encap`` action structure must defined a valid
+VLXAN network overlay which conforms with RFC 7348 (Virtual eXtensible Local Area
+Network (VXLAN): A Framework for Overlaying Virtualized Layer 2 Networks over
+Layer 3 Networks). The pattern must be terminated with
+the RTE_FLOW_ITEM_TYPE_END item type.
+
+- Non-terminating by default.
+
+.. _table_rte_flow_action_tunnel_encap:
+
+.. table:: TUNNEL_ENCAP
+
+   +----------------+-------------------------------------+
+   | Field          | Value                               |
+   +================+=====================================+
+   | ``definition`` | Tunnel end-point overlay definition |
+   +----------------+-------------------------------------+
+
+.. _table_rte_flow_action_tunnel_encap_example:
+
+.. table:: IPv4 VxLAN flow pattern example.
+
+   +-------+----------+
+   | Index | Item     |
+   +=======+==========+
+   | 0     | Ethernet |
+   +-------+----------+
+   | 1     | IPv4     |
+   +-------+----------+
+   | 2     | UDP      |
+   +-------+----------+
+   | 3     | VXLAN    |
+   +-------+----------+
+   | 4     | END      |
+   +-------+----------+
+
+Action: ``VXLAN_DECAP``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Performs a decapsulation action by stripping all headers of the VXLAN tunnel
+network overlay from the matched flow.
+
+This action modifies the payload of matched flows.
+
+Action: ``NVGRE_ENCAP``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Performs a NVGRE encapsulation action by encapsulating the matched flow in the
+NVGRE tunnel as defined in the``rte_flow_action_tunnel_encap`` flow item
+definition.
+
+This action modifies the payload of matched flows. The flow definition specified
+in the ``rte_flow_action_tunnel_encap`` action structure must defined a valid
+NVGRE network overlay which conforms with RFC 7637 (NVGRE: Network Virtualization
+Using Generic Routing Encapsulation). The pattern must be terminated with
+the RTE_FLOW_ITEM_TYPE_END item type.
+
+.. _table_rte_flow_action_tunnel_encap_example:
+
+.. table:: IPv4 NVGRE flow pattern example.
+
+   +-------+----------+
+   | Index | Item     |
+   +=======+==========+
+   | 0     | Ethernet |
+   +-------+----------+
+   | 1     | IPv4     |
+   +-------+----------+
+   | 2     | NVGRE    |
+   +-------+----------+
+   | 3     | END      |
+   +-------+----------+
+
+Action: ``NVGRE_DECAP``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Performs a decapsulation action by stripping all headers of the NVGRE tunnel
+network overlay from the matched flow.
+
+This action modifies the payload of matched flows.
+
 Negative types
 ~~~~~~~~~~~~~~
 
diff --git a/lib/librte_ether/rte_flow.h b/lib/librte_ether/rte_flow.h
index 56c733451..537e1bfba 100644
--- a/lib/librte_ether/rte_flow.h
+++ b/lib/librte_ether/rte_flow.h
@@ -1010,7 +1010,35 @@ enum rte_flow_action_type {
 	 *
 	 * See struct rte_flow_action_security.
 	 */
-	RTE_FLOW_ACTION_TYPE_SECURITY
+	RTE_FLOW_ACTION_TYPE_SECURITY,
+
+	/**
+	 * Encapsulate flow in VXLAN tunnel as defined in RFC7348
+	 * using headers defined in rte_flow_action_tunnel_encap
+	 * structure.
+	 *
+	 * See struct rte_flow_action_tunnel_encap.
+	 */
+	RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP,
+
+	/**
+	 * Decapsulate outer most VXLAN tunnel headers from flow
+	 */
+	RTE_FLOW_ACTION_TYPE_VXLAN_DECAP,
+
+	/**
+	 * Encapsulate flow in NVGRE tunnel as defined in RFC7637
+	 * using header defined in the rte_flow_action_tunnel_encap
+	 * structure.
+	 *
+	 * See struct rte_flow_action_tunnel_encap.
+	 */
+	RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP,
+
+	/**
+	 * Decapsulate outer most NVGRE tunnel headers from flow
+	 */
+	RTE_FLOW_ACTION_TYPE_NVGRE_DECAP
 };
 
 /**
@@ -1148,6 +1176,43 @@ struct rte_flow_action_security {
 	void *security_session; /**< Pointer to security session structure. */
 };
 
+/**
+ * RTE_FLOW_ACTION_TYPE_TUNNEL_ENCAP
+ *
+ * Tunnel end-point encapsulation data definition
+ *
+ * The tunnel definition is provided through the flow item pattern pattern, the
+ * provided pattern must conform with the corresponding RFC for the
+ * tunnel encapsulation action specified by the action type. The flow
+ * definition must be provided in order from the RTE_FLOW_ITEM_TYPE_ETH
+ * definition up the end item which is specified by RTE_FLOW_ITEM_TYPE_END.
+ *
+ * The mask field allows user to specify which fields in the flow item
+ * definitions can be ignored and which have valid data and can be used
+ * verbatim.
+ *
+ * Note: the last field is not used in the definition of a tunnel and can be
+ * ignored.
+ *
+ * For example if the actions type was RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP
+ * then valid patterns would include:
+ *
+ * - ETH / IPV4 / UDP / VXLAN / END
+ * - ETH / VLAN / IPV4 / UDP / VXLAN / END
+ *
+ * some valid examples for RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP include:
+ *
+ * - ETH / IPV4 / NVGRE / END
+ * - ETH / VLAN / IPV4 / NVGRE / END
+ */
+struct rte_flow_action_tunnel_encap {
+	struct rte_flow_item *definition;
+	/**<
+	 * Encapsulating tunnel definition
+	 * (list terminated by the END pattern item).
+	 */
+};
+
 /**
  * Definition of a single action.
  *
-- 
2.14.3