Function flow_mreg_update_copy_table

dpdk/drivers/net/mlx5/mlx5_flow.c:5385–5426

* Add a flow of copying flow metadata registers in RX_CP_TBL. * * All the flow having Q/RSS action should be split by * flow_mreg_split_qrss_prep() to pass by RX_CP_TBL. A flow in the RX_CP_TBL * performs the following, * - CQE->flow_tag := reg_c[1] (MARK) * - CQE->flow_table_metadata (reg_b) := reg_c[0] (META) * As CQE's flow_tag is not a register, it can't be simply copied from reg_c[

 *   0 on success, negative value otherwise and rte_errno is set.
 */
static int
flow_mreg_update_copy_table(struct rte_eth_dev *dev,
			    struct rte_flow *flow,
			    const struct rte_flow_action *actions,
			    struct rte_flow_error *error)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	struct mlx5_sh_config *config = &priv->sh->config;
	struct mlx5_flow_mreg_copy_resource *mcp_res;
	const struct rte_flow_action_mark *mark;

	/* Check whether extensive metadata feature is engaged. */
	if (!config->dv_flow_en ||
	    config->dv_xmeta_en == MLX5_XMETA_MODE_LEGACY ||
	    !mlx5_flow_ext_mreg_supported(dev) ||
	    !priv->sh->dv_regc0_mask)
		return 0;
	/* Find MARK action. */
	for (; actions->type != RTE_FLOW_ACTION_TYPE_END; actions++) {
		switch (actions->type) {
		case RTE_FLOW_ACTION_TYPE_FLAG:
			mcp_res = flow_mreg_add_copy_action
				(dev, MLX5_FLOW_MARK_DEFAULT, error);
			if (!mcp_res)
				return -rte_errno;
			flow->rix_mreg_copy = mcp_res->idx;
			return 0;
		case RTE_FLOW_ACTION_TYPE_MARK:
			mark = (const struct rte_flow_action_mark *)
				actions->conf;
			mcp_res =
				flow_mreg_add_copy_action(dev, mark->id, error);
			if (!mcp_res)
				return -rte_errno;
			flow->rix_mreg_copy = mcp_res->idx;
			return 0;
		default:
			break;
		}
	}
	return 0;
}

#define MLX5_MAX_SPLIT_ACTIONS 24
#define MLX5_MAX_SPLIT_ITEMS 24