+Item: ``E_TAG``
+^^^^^^^^^^^^^^^
+
+Matches an IEEE 802.1BR E-Tag header.
+
+- ``tpid``: tag protocol identifier (0x893F)
+- ``epcp_edei_in_ecid_b``: E-Tag control information (E-TCI), E-PCP (3b),
+ E-DEI (1b), ingress E-CID base (12b).
+- ``rsvd_grp_ecid_b``: reserved (2b), GRP (2b), E-CID base (12b).
+- ``in_ecid_e``: ingress E-CID ext.
+- ``ecid_e``: E-CID ext.
+- Default ``mask`` simultaneously matches GRP and E-CID base.
+
+Item: ``NVGRE``
+^^^^^^^^^^^^^^^
+
+Matches a NVGRE header (RFC 7637).
+
+- ``c_k_s_rsvd0_ver``: checksum (1b), undefined (1b), key bit (1b),
+ sequence number (1b), reserved 0 (9b), version (3b). This field must have
+ value 0x2000 according to RFC 7637.
+- ``protocol``: protocol type (0x6558).
+- ``tni``: virtual subnet ID.
+- ``flow_id``: flow ID.
+- Default ``mask`` matches TNI only.
+
+Item: ``MPLS``
+^^^^^^^^^^^^^^
+
+Matches a MPLS header.
+
+- ``label_tc_s_ttl``: label, TC, Bottom of Stack and TTL.
+- Default ``mask`` matches label only.
+
+Item: ``GRE``
+^^^^^^^^^^^^^
+
+Matches a GRE header.
+
+- ``c_rsvd0_ver``: checksum, reserved 0 and version.
+- ``protocol``: protocol type.
+- Default ``mask`` matches protocol only.
+
+Item: ``FUZZY``
+^^^^^^^^^^^^^^^
+
+Fuzzy pattern match, expect faster than default.
+
+This is for device that support fuzzy match option. Usually a fuzzy match is
+fast but the cost is accuracy. i.e. Signature Match only match pattern's hash
+value, but it is possible two different patterns have the same hash value.
+
+Matching accuracy level can be configured by threshold. Driver can divide the
+range of threshold and map to different accuracy levels that device support.
+
+Threshold 0 means perfect match (no fuzziness), while threshold 0xffffffff
+means fuzziest match.
+
+.. _table_rte_flow_item_fuzzy:
+
+.. table:: FUZZY
+
+ +----------+---------------+--------------------------------------------------+
+ | Field | Subfield | Value |
+ +==========+===============+==================================================+
+ | ``spec`` | ``threshold`` | 0 as perfect match, 0xffffffff as fuzziest match |
+ +----------+---------------+--------------------------------------------------+
+ | ``last`` | ``threshold`` | upper range value |
+ +----------+---------------+--------------------------------------------------+
+ | ``mask`` | ``threshold`` | bit-mask apply to "spec" and "last" |
+ +----------+---------------+--------------------------------------------------+
+
+Usage example, fuzzy match a TCPv4 packets:
+
+.. _table_rte_flow_item_fuzzy_example:
+
+.. table:: Fuzzy matching
+
+ +-------+----------+
+ | Index | Item |
+ +=======+==========+
+ | 0 | FUZZY |
+ +-------+----------+
+ | 1 | Ethernet |
+ +-------+----------+
+ | 2 | IPv4 |
+ +-------+----------+
+ | 3 | TCP |
+ +-------+----------+
+ | 4 | END |
+ +-------+----------+
+
+Item: ``GTP``, ``GTPC``, ``GTPU``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Matches a GTPv1 header.
+
+Note: GTP, GTPC and GTPU use the same structure. GTPC and GTPU item
+are defined for a user-friendly API when creating GTP-C and GTP-U
+flow rules.
+
+- ``v_pt_rsv_flags``: version (3b), protocol type (1b), reserved (1b),
+ extension header flag (1b), sequence number flag (1b), N-PDU number
+ flag (1b).
+- ``msg_type``: message type.
+- ``msg_len``: message length.
+- ``teid``: tunnel endpoint identifier.
+- Default ``mask`` matches teid only.
+
+Item: ``ESP``
+^^^^^^^^^^^^^
+
+Matches an ESP header.
+
+- ``hdr``: ESP header definition (``rte_esp.h``).
+- Default ``mask`` matches SPI only.
+
+Item: ``GENEVE``
+^^^^^^^^^^^^^^^^
+
+Matches a GENEVE header.
+
+- ``ver_opt_len_o_c_rsvd0``: version (2b), length of the options fields (6b),
+ OAM packet (1b), critical options present (1b), reserved 0 (6b).
+- ``protocol``: protocol type.
+- ``vni``: virtual network identifier.
+- ``rsvd1``: reserved, normally 0x00.
+- Default ``mask`` matches VNI only.
+