[PATCH v4 3/4] doc: add PMD ptype item limitations

[Alexander Kozyrev]

From: Michael Baum <michaelba at nvidia.com>

Add limitations for ptype item support in "mlx5.rst" file.

Signed-off-by: Michael Baum <michaelba at nvidia.com>
---
 doc/guides/nics/features/mlx5.ini |  1 +
 doc/guides/nics/mlx5.rst          | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/doc/guides/nics/features/mlx5.ini b/doc/guides/nics/features/mlx5.ini
index fc67415c6c..e3927ab4df 100644
--- a/doc/guides/nics/features/mlx5.ini
+++ b/doc/guides/nics/features/mlx5.ini
@@ -86,6 +86,7 @@ nsh                  = Y
 nvgre                = Y
 port_id              = Y
 port_representor     = Y
+ptype                = Y
 quota                = Y
 tag                  = Y
 tcp                  = Y
diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 7086f3d1d4..c9e74948cc 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -646,6 +646,21 @@ Limitations
   - When using HWS flow engine (``dv_flow_en`` = 2),
     only meter mark action is supported.
 
+- Ptype:
+
+  - Only supports HW steering (``dv_flow_en=2``).
+  - The supported values are:
+    L2: ``RTE_PTYPE_L2_ETHER``, ``RTE_PTYPE_L2_ETHER_VLAN``, ``RTE_PTYPE_L2_ETHER_QINQ``
+    L3: ``RTE_PTYPE_L3_IPV4``, ``RTE_PTYPE_L3_IPV6``
+    L4: ``RTE_PTYPE_L4_TCP``, ``RTE_PTYPE_L4_UDP``, ``RTE_PTYPE_L4_ICMP``
+    and their ``RTE_PTYPE_INNER_XXX`` counterparts as well as ``RTE_PTYPE_TUNNEL_ESP``.
+    Any other values are not supported. Using them as a value will cause unexpected behavior.
+  - Matching on both outer and inner IP fragmented is supported using ``RTE_PTYPE_L4_FRAG`` and
+    ``RTE_PTYPE_INNER_L4_FRAG`` values. They are not part of L4 types, so they should be provided
+    explicitly as a mask value during pattern template creation. Providing ``RTE_PTYPE_L4_MASK``
+    during pattern template creation and ``RTE_PTYPE_L4_FRAG`` during flow rule creation
+    will cause unexpected behavior.
+
 - Integrity:
 
   - Integrity offload is enabled starting from **ConnectX-6 Dx**.
-- 
2.18.2