[PATCH 2/2] net/mlx5: add random item support

[Michael Baum <michaelba@nvidia.com>]

Add support for random item in HWS mode.

Signed-off-by: Michael Baum <michaelba@nvidia.com>
---
 doc/guides/nics/features/mlx5.ini      |  1 +
 doc/guides/nics/mlx5.rst               | 10 +++++++++-
 doc/guides/rel_notes/release_23_11.rst |  4 ++++
 drivers/net/mlx5/mlx5_flow_dv.c        |  5 +++++
 drivers/net/mlx5/mlx5_flow_hw.c        |  5 +++++
 5 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/features/mlx5.ini b/doc/guides/nics/features/mlx5.ini
index c0e0b779cf..5606f435f2 100644
--- a/doc/guides/nics/features/mlx5.ini
+++ b/doc/guides/nics/features/mlx5.ini
@@ -86,6 +86,7 @@ nvgre                = Y
 port_id              = Y
 port_representor     = Y
 quota                = Y
+random               = Y
 tag                  = Y
 tcp                  = Y
 udp                  = Y
diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index eac67a7864..f754fab3e1 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -165,7 +165,7 @@ Features
 - Sub-Function.
 - Matching on represented port.
 - Matching on aggregated affinity.
-
+- Matching on random value.
 
 Limitations
 -----------
@@ -554,6 +554,7 @@ Limitations
   - Modification of the MPLS header is supported only in HWS and only to copy from,
     the encapsulation level is always 0.
   - Modification of the 802.1Q Tag, VXLAN Network or GENEVE Network ID's is not supported.
+  - Modify field action using ``RTE_FLOW_FIELD_RANDOM`` is not supported.
   - Encapsulation levels are not supported, can modify outermost header fields only.
   - Offsets cannot skip past the boundary of a field.
   - If the field type is ``RTE_FLOW_FIELD_MAC_TYPE``
@@ -712,6 +713,13 @@ Limitations
 
 - The NIC egress flow rules on representor port are not supported.
 
+- Match on random value:
+
+  - Supported only with HW Steering enabled (``dv_flow_en`` = 2).
+  - Supported only in table with ``nb_flows=1``.
+  - NIC ingress flow in group 0 is not supported.
+  - Supports matching only 16 bits (LSB).
+
 - During live migration to a new process set its flow engine as standby mode,
   the user should only program flow rules in group 0 (``fdb_def_rule_en=0``).
   Live migration is only supported under SWS (``dv_flow_en=1``).
diff --git a/doc/guides/rel_notes/release_23_11.rst b/doc/guides/rel_notes/release_23_11.rst
index 1e90bf83e7..8a4c04ed75 100644
--- a/doc/guides/rel_notes/release_23_11.rst
+++ b/doc/guides/rel_notes/release_23_11.rst
@@ -76,6 +76,10 @@ New Features
 
   Added ``RTE_FLOW_ITEM_RANDOM`` to match random value.
 
+* **Updated NVIDIA mlx5 net driver.**
+
+  * Added support for random value matching.
+
 
 Removed Items
 -------------
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index a8dd9920e6..1238d00073 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -5385,6 +5385,11 @@ flow_dv_validate_action_modify_field(struct rte_eth_dev *dev,
 				RTE_FLOW_ERROR_TYPE_ACTION, action,
 				"modifications of the MPLS header "
 				"is not supported");
+	if (dst_data->field == RTE_FLOW_FIELD_RANDOM ||
+	    src_data->field == RTE_FLOW_FIELD_RANDOM)
+		return rte_flow_error_set(error, ENOTSUP,
+				RTE_FLOW_ERROR_TYPE_ACTION, action,
+				"modifications of random value is not supported");
 	if (dst_data->field == RTE_FLOW_FIELD_MARK ||
 	    src_data->field == RTE_FLOW_FIELD_MARK)
 		if (config->dv_xmeta_en == MLX5_XMETA_MODE_LEGACY ||
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index 5395969eb0..6fe6103a37 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -3893,6 +3893,10 @@ flow_hw_validate_action_modify_field(const struct rte_flow_action *action,
 		return rte_flow_error_set(error, EINVAL,
 				RTE_FLOW_ERROR_TYPE_ACTION, action,
 				"modifying Geneve VNI is not supported");
+	if (flow_hw_modify_field_is_used(action_conf, RTE_FLOW_FIELD_RANDOM))
+		return rte_flow_error_set(error, EINVAL,
+				RTE_FLOW_ERROR_TYPE_ACTION, action,
+				"modifying random value is not supported");
 	/* Due to HW bug, tunnel MPLS header is read only. */
 	if (action_conf->dst.field == RTE_FLOW_FIELD_MPLS)
 		return rte_flow_error_set(error, EINVAL,
@@ -5375,6 +5379,7 @@ flow_hw_pattern_validate(struct rte_eth_dev *dev,
 		case RTE_FLOW_ITEM_TYPE_ESP:
 		case RTE_FLOW_ITEM_TYPE_FLEX:
 		case RTE_FLOW_ITEM_TYPE_IB_BTH:
+		case RTE_FLOW_ITEM_TYPE_RANDOM:
 			break;
 		case RTE_FLOW_ITEM_TYPE_INTEGRITY:
 			/*
-- 
2.25.1