[dpdk-dev] [PATCH] net/mlx5: support match on GTP flags

[Dekel Peled <dekelp@mellanox.com>]

This patch adds to MLX5 PMD the support of matching on
GTP header item v_pt_rsv_flags.

This item is contained in 1 byte of the format:
-------------------------------------------
| bit   | 0 - 2   | 3  | 4   | 5 | 6 | 7  |
|-----------------------------------------|
| value | Version | PT | Res | E | S | PN |
-------------------------------------------

Matching is supported only for GTP flags E, S, PN.
Therefore values 0 to 7 are supported.

Mask must be set accordingly:
... gtp v_pt_rsv_flags is 1 v_pt_rsv_flags mask 0x07 ...

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
---
 doc/guides/nics/mlx5.rst               |  1 +
 doc/guides/rel_notes/release_20_05.rst |  1 +
 drivers/net/mlx5/mlx5_flow_dv.c        | 23 +++++++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index c4bc77c..f561683 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -162,6 +162,7 @@ Limitations
 
 - Match on GTP tunnel header item supports the following fields only:
 
+     - v_pt_rsv_flags: E flag, S flag, PN flag
      - msg_type
      - teid
 
diff --git a/doc/guides/rel_notes/release_20_05.rst b/doc/guides/rel_notes/release_20_05.rst
index 2f60e67..8bab5a3 100644
--- a/doc/guides/rel_notes/release_20_05.rst
+++ b/doc/guides/rel_notes/release_20_05.rst
@@ -144,6 +144,7 @@ New Features
   * Removed flow rules caching for memory saving and compliance with ethdev API.
   * Optimized the memory consumption of flow.
   * Added support for flow aging based on hardware counter.
+  * Updated support for matching on GTP header, added match on GTP flags.
 
 * **Updated the AESNI MB crypto PMD.**
 
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index aa5c353..e5e656f 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1639,6 +1639,18 @@ struct field_modify_info modify_tcp[] = {
 	return 0;
 }
 
+/*
+ * GTP flags are contained in 1 byte of the format:
+ * -------------------------------------------
+ * | bit   | 0 - 2   | 3  | 4   | 5 | 6 | 7  |
+ * |-----------------------------------------|
+ * | value | Version | PT | Res | E | S | PN |
+ * -------------------------------------------
+ *
+ * Matching is supported only for GTP flags E, S, PN.
+ */
+#define MLX5_GTP_FLAGS_MASK	0x07
+
 /**
  * Validate GTP item.
  *
@@ -1661,8 +1673,10 @@ struct field_modify_info modify_tcp[] = {
 			  struct rte_flow_error *error)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
+	const struct rte_flow_item_gtp *spec = item->spec;
 	const struct rte_flow_item_gtp *mask = item->mask;
 	const struct rte_flow_item_gtp nic_mask = {
+		.v_pt_rsv_flags = MLX5_GTP_FLAGS_MASK,
 		.msg_type = 0xff,
 		.teid = RTE_BE32(0xffffffff),
 	};
@@ -1682,6 +1696,11 @@ struct field_modify_info modify_tcp[] = {
 					  "no outer UDP layer found");
 	if (!mask)
 		mask = &rte_flow_item_gtp_mask;
+	if (spec && spec->v_pt_rsv_flags & ~MLX5_GTP_FLAGS_MASK)
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "Match is supported for GTP"
+					  " flags only");
 	return mlx5_flow_item_acceptable
 		(item, (const uint8_t *)mask,
 		 (const uint8_t *)&nic_mask,
@@ -7047,6 +7066,10 @@ struct field_modify_info modify_tcp[] = {
 		return;
 	if (!gtp_m)
 		gtp_m = &rte_flow_item_gtp_mask;
+	MLX5_SET(fte_match_set_misc3, misc3_m, gtpu_msg_flags,
+		 gtp_m->v_pt_rsv_flags);
+	MLX5_SET(fte_match_set_misc3, misc3_v, gtpu_msg_flags,
+		 gtp_v->v_pt_rsv_flags & gtp_m->v_pt_rsv_flags);
 	MLX5_SET(fte_match_set_misc3, misc3_m, gtpu_msg_type, gtp_m->msg_type);
 	MLX5_SET(fte_match_set_misc3, misc3_v, gtpu_msg_type,
 		 gtp_v->msg_type & gtp_m->msg_type);
-- 
1.8.3.1