[PATCH] net/mlx5: add match on IPv6 fragment extension header

[PATCH] net/mlx5: add match on IPv6 fragment extension header

[Maayan Kashani]

Add HWS support for IPv6 fragment extension header
matching for HWS.
Supported field is next_header.

Signed-off-by: Maayan Kashani <mkashani@nvidia.com>
Acked-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
---
 doc/guides/rel_notes/release_25_07.rst |  4 ++
 drivers/net/mlx5/hws/mlx5dr_definer.c  | 51 ++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_flow_hw.c        |  1 +
 3 files changed, 56 insertions(+)

diff --git a/doc/guides/rel_notes/release_25_07.rst b/doc/guides/rel_notes/release_25_07.rst
index cd1025aac09..6503f5a9f3c 100644
--- a/doc/guides/rel_notes/release_25_07.rst
+++ b/doc/guides/rel_notes/release_25_07.rst
@@ -55,6 +55,10 @@ New Features
      Also, make sure to start the actual text at the margin.
      =======================================================
 
+* **Updated NVIDIA mlx5 driver.**
+
+  * Support matching on IPv6 frag extension header with rte_flow template API.
+
 
 Removed Items
 -------------
diff --git a/drivers/net/mlx5/hws/mlx5dr_definer.c b/drivers/net/mlx5/hws/mlx5dr_definer.c
index 5272119bcbe..9c11d6c2cb9 100644
--- a/drivers/net/mlx5/hws/mlx5dr_definer.c
+++ b/drivers/net/mlx5/hws/mlx5dr_definer.c
@@ -176,6 +176,7 @@ struct mlx5dr_definer_conv_data {
 	X(SET,          ip_fragmented,          !!v->fragment_offset,   rte_ipv4_hdr) \
 	X(SET_BE16,	ipv6_payload_len,	v->hdr.payload_len,	rte_flow_item_ipv6) \
 	X(SET,		ipv6_proto,		v->hdr.proto,		rte_flow_item_ipv6) \
+	X(SET,		ipv6_frag_proto,	v->hdr.next_header, rte_flow_item_ipv6_frag_ext) \
 	X(SET,		ipv6_routing_hdr,	IPPROTO_ROUTING,	rte_flow_item_ipv6) \
 	X(SET,		ipv6_hop_limits,	v->hdr.hop_limits,	rte_flow_item_ipv6) \
 	X(SET_BE32P,	ipv6_src_addr_127_96,	&v->hdr.src_addr.a[0],	rte_flow_item_ipv6) \
@@ -2553,6 +2554,51 @@ mlx5dr_definer_conv_item_ipv6_routing_ext(struct mlx5dr_definer_conv_data *cd,
 	return 0;
 }
 
+static int
+mlx5dr_definer_conv_item_ipv6_frag_ext(struct mlx5dr_definer_conv_data *cd,
+					  struct rte_flow_item *item,
+					  int item_idx)
+{
+	const struct rte_flow_item_ipv6_frag_ext *m = item->mask;
+	struct mlx5dr_definer_fc *fc;
+	bool inner = cd->tunnel;
+
+	if (!cd->relaxed) {
+		fc = &cd->fc[DR_CALC_FNAME(IP_VERSION, inner)];
+		fc->item_idx = item_idx;
+		fc->tag_set = &mlx5dr_definer_ipv6_version_set;
+		fc->tag_mask_set = &mlx5dr_definer_ones_set;
+		DR_CALC_SET(fc, eth_l2, l3_type, inner);
+
+		/* Overwrite - Unset ethertype if present */
+		memset(&cd->fc[DR_CALC_FNAME(ETH_TYPE, inner)], 0, sizeof(*fc));
+
+		fc = &cd->fc[DR_CALC_FNAME(IP_FRAG, inner)];
+		if (!fc->tag_set) {
+			fc->item_idx = item_idx;
+			fc->tag_set = &mlx5dr_definer_ones_set;
+			fc->tag_mask_set = &mlx5dr_definer_ones_set;
+			DR_CALC_SET(fc, eth_l4, ip_fragmented, inner);
+		}
+	}
+
+	if (!m)
+		return 0;
+
+	if (m->hdr.frag_data || m->hdr.id || m->hdr.reserved) {
+		rte_errno = ENOTSUP;
+		return rte_errno;
+	}
+
+	if (m->hdr.next_header) {
+		fc = &cd->fc[DR_CALC_FNAME(IP_PROTOCOL, inner)];
+		fc->item_idx = item_idx;
+		fc->tag_set = &mlx5dr_definer_ipv6_frag_proto_set;
+		DR_CALC_SET(fc, eth_l3, protocol_next_header, inner);
+	}
+	return 0;
+}
+
 static int
 mlx5dr_definer_conv_item_random(struct mlx5dr_definer_conv_data *cd,
 				struct rte_flow_item *item,
@@ -3285,6 +3331,11 @@ mlx5dr_definer_conv_items_to_hl(struct mlx5dr_context *ctx,
 			item_flags |= cd.tunnel ? MLX5_FLOW_LAYER_INNER_L3_IPV6 :
 						  MLX5_FLOW_LAYER_OUTER_L3_IPV6;
 			break;
+		case RTE_FLOW_ITEM_TYPE_IPV6_FRAG_EXT:
+			ret = mlx5dr_definer_conv_item_ipv6_frag_ext(&cd, items, i);
+			item_flags |= cd.tunnel ? MLX5_FLOW_LAYER_INNER_L3_IPV6_FRAG_EXT :
+						  MLX5_FLOW_LAYER_OUTER_L3_IPV6_FRAG_EXT;
+			break;
 		case RTE_FLOW_ITEM_TYPE_UDP:
 			ret = mlx5dr_definer_conv_item_udp(&cd, items, i);
 			item_flags |= cd.tunnel ? MLX5_FLOW_LAYER_INNER_L4_UDP :
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index 20d38ce4141..9a281b67dc7 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -8899,6 +8899,7 @@ flow_hw_pattern_validate(struct rte_eth_dev *dev,
 			*item_flags |= MLX5_FLOW_LAYER_ECPRI;
 			break;
 		case RTE_FLOW_ITEM_TYPE_IB_BTH:
+		case RTE_FLOW_ITEM_TYPE_IPV6_FRAG_EXT:
 		case RTE_FLOW_ITEM_TYPE_VOID:
 		case RTE_FLOW_ITEM_TYPE_END:
 			break;
-- 
2.21.0