[dpdk-dev] [RFC 4/4] doc: update mlx5 document for flow dump feature

[Xiaoyu Min <jackmin@mellanox.com>]

From: Xueming Li <xuemingl@mellanox.com>

Guide of mlx5 is updated on how to dump HW flows.

Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
---
 doc/guides/nics/mlx5.rst | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 92228d3cca..4781aae0aa 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -1316,3 +1316,31 @@ ConnectX-4/ConnectX-5/ConnectX-6/BlueField devices managed by librte_pmd_mlx5.
       Port 3 Link Up - speed 10000 Mbps - full-duplex
       Done
       testpmd>
+
+HowTo dump flows
+----------------
+
+This section demonstrates how to dump flows. Currently, it's possible to dump
+all flows with assistence of external tools.
+
+#. 2 ways to get flow raw file:
+
+   - Using testpmd CLI:
+
+   .. code-block:: console
+
+       testpmd> flow dump <port> <output_file>
+
+   - call mlx5 PMD api in rte_pmd_mlx5.h:
+
+   .. code-block:: console
+
+       rte_pmd_mlx5_flow_dump(port, file);
+
+#. Dump humanreadable flows from raw file:
+
+   Get flow parsing tool from: https://github.com/Mellanox/mlx_steering_dump
+
+   .. code-block:: console
+
+       mlx_steering_dump.py -f <output_file>
-- 
2.24.1