[dpdk-dev] [PATCH v2 5/5] net/mlx5: enforce limitation on IPv6 next proto

[Dekel Peled]

Due to PRM requirement, the IPv6 header item 'proto' field, indicating
the next header protocol, should not be set as extension header.
This patch adds the relevant validation, and documents the limitation.

Signed-off-by: Dekel Peled <dekelp at nvidia.com>
Acked-by: Ori Kam <orika at nvidia.com>
---
 doc/guides/nics/mlx5.rst     |  7 +++++++
 drivers/net/mlx5/mlx5_flow.c | 14 ++++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index a071db2..c2bd737 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -317,6 +317,13 @@ Limitations
   - The E-Switch Sample flow must have the eswitch_manager VPORT destination (PF or ECPF) and no additional actions.
   - For ConnectX-5, the ``RTE_FLOW_ACTION_TYPE_SAMPLE`` is typically used as first action in the E-Switch egress flow if with header modify or encapsulation actions.
 
+- IPv6 header item 'proto' field, indicating the next header protocol, should
+  not be set as extension header.
+  In case the next header is an extension header, it should not be specified in
+  IPv6 header item 'proto' field.
+  The last extension header item 'next header' field can specify the following
+  header protocol type.
+
 Statistics
 ----------
 
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 1116ebb..2922cae 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1977,9 +1977,9 @@ struct mlx5_flow_tunnel_info {
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "IPv6 cannot follow L2/VLAN layer "
 					  "which ether type is not IPv6");
+	if (mask && spec)
+		next_proto = mask->hdr.proto & spec->hdr.proto;
 	if (item_flags & MLX5_FLOW_LAYER_IPV6_ENCAP) {
-		if (mask && spec)
-			next_proto = mask->hdr.proto & spec->hdr.proto;
 		if (next_proto == IPPROTO_IPIP || next_proto == IPPROTO_IPV6)
 			return rte_flow_error_set(error, EINVAL,
 						  RTE_FLOW_ERROR_TYPE_ITEM,
@@ -1987,6 +1987,16 @@ struct mlx5_flow_tunnel_info {
 						  "multiple tunnel "
 						  "not supported");
 	}
+	if (next_proto == IPPROTO_HOPOPTS  ||
+	    next_proto == IPPROTO_ROUTING  ||
+	    next_proto == IPPROTO_FRAGMENT ||
+	    next_proto == IPPROTO_ESP	   ||
+	    next_proto == IPPROTO_AH	   ||
+	    next_proto == IPPROTO_DSTOPTS)
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "IPv6 proto (next header) should "
+					  "not be set as extension header");
 	if (item_flags & MLX5_FLOW_LAYER_IPIP)
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
-- 
1.8.3.1