[PATCH v2] doc: document mlx5 HWS actions order

[Maayan Kashani]

Add actions order supported in mlx5 PMD when HW steering flow engine
 is used.
This limitation existed since HW Steering flow engine was introduced.

Fixes: 22681deead3e ("net/mlx5/hws: enable hardware steering")
Cc: stable at dpdk.org
Signed-off-by: Maayan Kashani <mkashani at nvidia.com>
Acked-by: Dariusz Sosnowski <dsosnowski at nvidia.com>
---
 doc/guides/nics/mlx5.rst | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 43fc181d8dc..4c00bb7755c 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -251,6 +251,26 @@ Limitations
     IPv6 routing extension matching is not supported in flow template relaxed
     matching mode (see ``struct rte_flow_pattern_template_attr::relaxed_matching``).
 
+  - The supported actions order is as below::
+
+          MARK(a)
+          *_DECAP(b)
+          OF_POP_VLAN
+          COUNT | AGE
+          METER_MARK | CONNTRACK
+          OF_PUSH_VLAN
+          MODIFY_FIELD
+          *_ENCAP(c)
+          JUMP | DROP | RSS(a) | QUEUE(a) | REPRESENTED_PORT(d)
+
+    a. Only supported on ingress.
+    b. Any decapsulation action, including the combination of RAW_ENCAP and RAW_DECAP actions
+       which results in L3 decapsulation.
+       Not supported on egress.
+    c. Any encapsulation action, including the combination of RAW_ENCAP and RAW_DECAP actions
+       which results in L3 encap.
+    d. Only in transfer (switchdev) mode.
+
 - When using Verbs flow engine (``dv_flow_en`` = 0), flow pattern without any
   specific VLAN will match for VLAN packets as well:
 
-- 
2.21.0