+/**
+ * The splitting for meter feature.
+ *
+ * - The meter flow will be split to two flows as prefix and
+ * suffix flow. The packets make sense only it pass the prefix
+ * meter action.
+ *
+ * - Reg_C_5 is used for the packet to match betweend prefix and
+ * suffix flow.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param[in] flow
+ * Parent flow structure pointer.
+ * @param[in] attr
+ * Flow rule attributes.
+ * @param[in] items
+ * Pattern specification (list terminated by the END pattern item).
+ * @param[in] actions
+ * Associated actions (list terminated by the END action).
+ * @param[in] external
+ * This flow rule is created by request external to PMD.
+ * @param[out] error
+ * Perform verbose error reporting if not NULL.
+ * @return
+ * 0 on success, negative value otherwise
+ */
+static int
+flow_create_split_meter(struct rte_eth_dev *dev,
+ struct rte_flow *flow,
+ const struct rte_flow_attr *attr,
+ const struct rte_flow_item items[],
+ const struct rte_flow_action actions[],
+ bool external, struct rte_flow_error *error)
+{
+ struct mlx5_priv *priv = dev->data->dev_private;
+ struct rte_flow_action *sfx_actions = NULL;
+ struct rte_flow_action *pre_actions = NULL;
+ struct rte_flow_item *sfx_items = NULL;
+ const struct rte_flow_item *sfx_port_id_item;
+ struct mlx5_flow *dev_flow = NULL;
+ struct rte_flow_attr sfx_attr = *attr;
+ uint32_t mtr = 0;
+ uint32_t mtr_tag_id = 0;
+ size_t act_size;
+ size_t item_size;
+ int actions_n = 0;
+ int ret;
+
+ if (priv->mtr_en)
+ actions_n = flow_check_meter_action(actions, &mtr);
+ if (mtr) {
+ struct mlx5_rte_flow_item_tag *tag_spec;
+ /* The five prefix actions: meter, decap, encap, tag, end. */
+ act_size = sizeof(struct rte_flow_action) * (actions_n + 5) +
+ sizeof(struct rte_flow_action_set_tag);
+ /* tag, end. */
+#define METER_SUFFIX_ITEM 3
+ item_size = sizeof(struct rte_flow_item) * METER_SUFFIX_ITEM +
+ sizeof(struct mlx5_rte_flow_item_tag);
+ sfx_actions = rte_zmalloc(__func__, (act_size + item_size), 0);
+ if (!sfx_actions)
+ return rte_flow_error_set(error, ENOMEM,
+ RTE_FLOW_ERROR_TYPE_ACTION,
+ NULL, "no memory to split "
+ "meter flow");
+ pre_actions = sfx_actions + actions_n;
+ mtr_tag_id = flow_meter_split_prep(dev, actions, sfx_actions,
+ pre_actions);
+ if (!mtr_tag_id) {
+ ret = -rte_errno;
+ goto exit;
+ }
+ /* Add the prefix subflow. */
+ ret = flow_create_split_inner(dev, flow, &dev_flow, attr, items,
+ pre_actions, external, error);
+ if (ret) {
+ ret = -rte_errno;
+ goto exit;
+ }
+ dev_flow->mtr_flow_id = mtr_tag_id;
+ /* Prepare the suffix flow match pattern. */
+ sfx_items = (struct rte_flow_item *)((char *)sfx_actions +
+ act_size);
+ tag_spec = (struct mlx5_rte_flow_item_tag *)(sfx_items +
+ METER_SUFFIX_ITEM);
+ tag_spec->data = rte_cpu_to_be_32(dev_flow->mtr_flow_id);
+ tag_spec->id = mlx5_flow_get_reg_id(dev, MLX5_MTR_SFX, 0,
+ error);
+ sfx_items->type = MLX5_RTE_FLOW_ITEM_TYPE_TAG;
+ sfx_items->spec = tag_spec;
+ sfx_items->last = NULL;
+ sfx_items->mask = NULL;
+ sfx_items++;
+ sfx_port_id_item = find_port_id_item(items);
+ if (sfx_port_id_item) {
+ memcpy(sfx_items, sfx_port_id_item,
+ sizeof(*sfx_items));
+ sfx_items++;
+ }
+ sfx_items->type = RTE_FLOW_ITEM_TYPE_END;
+ sfx_items -= METER_SUFFIX_ITEM;
+ /* Setting the sfx group atrr. */
+ sfx_attr.group = sfx_attr.transfer ?
+ (MLX5_FLOW_TABLE_LEVEL_SUFFIX - 1) :
+ MLX5_FLOW_TABLE_LEVEL_SUFFIX;
+ }
+ /* Add the prefix subflow. */
+ ret = flow_create_split_metadata(dev, flow, &sfx_attr,
+ sfx_items ? sfx_items : items,
+ sfx_actions ? sfx_actions : actions,
+ external, error);
+exit:
+ if (sfx_actions)
+ rte_free(sfx_actions);
+ return ret;
+}
+