+----+--------------------------------+
| 22 | RTE_FLOW_ITEM_TYPE_ANY |
+----+--------------------------------+
+ | 23 | RTE_FLOW_ITEM_TYPE_GRE_KEY |
+ +----+--------------------------------+
+
+.. note::
+
+ ``RTE_FLOW_ITEM_TYPE_GRE_KEY`` works only when checksum and routing
+ bits in the GRE header are equal to 0.
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