[RFC 1/3] ethdev: support GRE optional fields

[Sean Zhang <xiazhang@nvidia.com>]

Add flow pattern items and header format for matching optional fields
(checksum/key/sequence) in GRE header. And the flags in gre item should
be correspondingly set with the new added items.

Signed-off-by: Sean Zhang <xiazhang@nvidia.com>
---
 doc/guides/prog_guide/rte_flow.rst | 16 ++++++++++++++++
 lib/ethdev/rte_flow.c              |  1 +
 lib/ethdev/rte_flow.h              | 18 ++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index c51ed88..48d5685 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -1113,6 +1113,22 @@ This should be preceded by item ``GRE``.
 - Value to be matched is a big-endian 32 bit integer.
 - When this item present it implicitly match K bit in default mask as "1"
 
+Item: ``GRE_OPTION``
+^^^^^^^^^^^^^^^^^^^^
+
+Matches a GRE optional fields (checksum/key/sequence).
+This should be preceded by item ``GRE``.
+
+- ``checksum``: checksum.
+- ``key``: key.
+- ``sequence``: sequence.
+- The items in GRE_OPTION do not change bit flags(c_bit/k_bit/s_bit) in GRE
+  item. The bit flags need be set with GRE item by application. When the items
+  present, the corresponding bits in GRE spec and mask should be set "1" by
+  application, it means to match specified value of the fields. When the items
+  no present, but the corresponding bits in GRE spec and mask is "1", it means
+  to match any value of the fields.
+
 Item: ``FUZZY``
 ^^^^^^^^^^^^^^^
 
diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c
index a93f68a..03bd1df 100644
--- a/lib/ethdev/rte_flow.c
+++ b/lib/ethdev/rte_flow.c
@@ -139,6 +139,7 @@ struct rte_flow_desc_data {
 	MK_FLOW_ITEM(META, sizeof(struct rte_flow_item_meta)),
 	MK_FLOW_ITEM(TAG, sizeof(struct rte_flow_item_tag)),
 	MK_FLOW_ITEM(GRE_KEY, sizeof(rte_be32_t)),
+	MK_FLOW_ITEM(GRE_OPTION, sizeof(struct rte_gre_hdr_option)),
 	MK_FLOW_ITEM(GTP_PSC, sizeof(struct rte_flow_item_gtp_psc)),
 	MK_FLOW_ITEM(PPPOES, sizeof(struct rte_flow_item_pppoe)),
 	MK_FLOW_ITEM(PPPOED, sizeof(struct rte_flow_item_pppoe)),
diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
index 1031fb2..27b4140 100644
--- a/lib/ethdev/rte_flow.h
+++ b/lib/ethdev/rte_flow.h
@@ -660,6 +660,13 @@ enum rte_flow_item_type {
 	 * See struct rte_flow_item_ppp.
 	 */
 	RTE_FLOW_ITEM_TYPE_PPP,
+
+	/**
+	 * Matches GRE optional fields.
+	 *
+	 * See struct rte_gre_hdr_option.
+	 */
+	RTE_FLOW_ITEM_TYPE_GRE_OPTION,
 };
 
 /**
@@ -1196,6 +1203,17 @@ struct rte_flow_item_gre {
 #endif
 
 /**
+ * RTE_FLOW_ITEM_TYPE_GRE_OPTION.
+ *
+ * Matches GRE optional fields in header.
+ */
+struct rte_gre_hdr_option {
+	rte_be16_t checksum;
+	rte_be32_t key;
+	rte_be32_t sequence;
+};
+
+/**
  * RTE_FLOW_ITEM_TYPE_FUZZY
  *
  * Fuzzy pattern match, expect faster than default.
-- 
1.8.3.1