[dpdk-dev] [PATCH 03/20] net/mlx5: add metadata register copy

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

Add flow metadata register copy action which is supported through modify
header command. As it is an internal action, not exposed to users, item
type (MLX5_RTE_FLOW_ACTION_TYPE_COPY_MREG) is negative value. This can be
used when creating PMD internal subflows.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.h    | 13 +++++++----
 drivers/net/mlx5/mlx5_flow_dv.c | 50 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 58 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 8cc6c47..170192d 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -47,24 +47,30 @@ enum mlx5_rte_flow_item_type {
 	MLX5_RTE_FLOW_ITEM_TYPE_TX_QUEUE,
 };
 
-/* Private rte flow actions. */
+/* Private (internal) rte flow actions. */
 enum mlx5_rte_flow_action_type {
 	MLX5_RTE_FLOW_ACTION_TYPE_END = INT_MIN,
 	MLX5_RTE_FLOW_ACTION_TYPE_TAG,
+	MLX5_RTE_FLOW_ACTION_TYPE_COPY_MREG,
 };
 
 /* Matches on selected register. */
 struct mlx5_rte_flow_item_tag {
-	uint16_t id;
+	enum modify_reg id;
 	uint32_t data;
 };
 
 /* Modify selected register. */
 struct mlx5_rte_flow_action_set_tag {
-	uint16_t id;
+	enum modify_reg id;
 	uint32_t data;
 };
 
+struct mlx5_flow_action_copy_mreg {
+	enum modify_reg dst;
+	enum modify_reg src;
+};
+
 /* Matches on source queue. */
 struct mlx5_rte_flow_item_tx_queue {
 	uint32_t queue;
@@ -227,7 +233,6 @@ struct mlx5_rte_flow_item_tx_queue {
 
 #define MLX5_FLOW_VLAN_ACTIONS (MLX5_FLOW_ACTION_OF_POP_VLAN | \
 				MLX5_FLOW_ACTION_OF_PUSH_VLAN)
-
 #ifndef IPPROTO_MPLS
 #define IPPROTO_MPLS 137
 #endif
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 3df2609..930f088 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -861,7 +861,7 @@ struct field_modify_info modify_tcp[] = {
 			 const struct rte_flow_action *action,
 			 struct rte_flow_error *error)
 {
-	const struct mlx5_rte_flow_action_set_tag *conf = (action->conf);
+	const struct mlx5_rte_flow_action_set_tag *conf = action->conf;
 	struct mlx5_modification_cmd *actions = resource->actions;
 	uint32_t i = resource->actions_num;
 
@@ -883,6 +883,47 @@ struct field_modify_info modify_tcp[] = {
 }
 
 /**
+ * Convert internal COPY_REG action to DV specification.
+ *
+ * @param[in] dev
+ *   Pointer to the rte_eth_dev structure.
+ * @param[in,out] res
+ *   Pointer to the modify-header resource.
+ * @param[in] action
+ *   Pointer to action specification.
+ * @param[out] error
+ *   Pointer to the error structure.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+flow_dv_convert_action_copy_mreg(struct rte_eth_dev *dev  __rte_unused,
+				 struct mlx5_flow_dv_modify_hdr_resource *res,
+				 const struct rte_flow_action *action,
+				 struct rte_flow_error *error)
+{
+	const struct mlx5_flow_action_copy_mreg *conf = action->conf;
+	uint32_t mask = RTE_BE32(UINT32_MAX);
+	struct rte_flow_item item = {
+		.spec = NULL,
+		.mask = &mask,
+	};
+	struct field_modify_info reg_src[] = {
+		{4, 0, reg_to_field[conf->src]},
+		{0, 0, 0},
+	};
+	struct field_modify_info reg_dst = {
+		.offset = (uint32_t)-1, /* Same as src. */
+		.id = reg_to_field[conf->dst],
+	};
+	return flow_dv_convert_modify_action(&item,
+					     reg_src, &reg_dst, res,
+					     MLX5_MODIFICATION_TYPE_COPY,
+					     error);
+}
+
+/**
  * Validate META item.
  *
  * @param[in] dev
@@ -3949,6 +3990,7 @@ struct field_modify_info modify_tcp[] = {
 						MLX5_FLOW_ACTION_DEC_TCP_ACK;
 			break;
 		case MLX5_RTE_FLOW_ACTION_TYPE_TAG:
+		case MLX5_RTE_FLOW_ACTION_TYPE_COPY_MREG:
 			break;
 		default:
 			return rte_flow_error_set(error, ENOTSUP,
@@ -5945,6 +5987,12 @@ struct field_modify_info modify_tcp[] = {
 				return -rte_errno;
 			action_flags |= MLX5_FLOW_ACTION_SET_TAG;
 			break;
+		case MLX5_RTE_FLOW_ACTION_TYPE_COPY_MREG:
+			if (flow_dv_convert_action_copy_mreg(dev, &res,
+							     actions, error))
+				return -rte_errno;
+			action_flags |= MLX5_FLOW_ACTION_SET_TAG;
+			break;
 		case RTE_FLOW_ACTION_TYPE_END:
 			actions_end = true;
 			if (action_flags & MLX5_FLOW_MODIFY_HDR_ACTIONS) {
-- 
1.8.3.1