[PATCH 07/10] net/mlx5: get priority to send traffic to kernel

[Michael Savisko]

Introduce mlx5_get_send_to_kernel_priority() function which returns
value of priority which must be used to jump back to table 0 in order
to send traffic to kernel. This function returns lowest priority.

Signed-off-by: Michael Savisko <michael...@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.c | 33 +++++++++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_flow.h |  1 +
 2 files changed, 34 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 8c93a3f2e5..c9e2b68957 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -10968,6 +10968,39 @@ mlx5_flow_adjust_priority(struct rte_eth_dev *dev, 
int32_t priority,
        return  res;
 }
 
+/**
+ * Get the priority for sending traffic to kernel table.
+ *
+ * @param[in] dev
+ *   Pointer to the Ethernet device structure.
+ *
+ * @return
+ *   On success: the value of priority for sending traffic to kernel table
+ *   On failure: -1
+ */
+uint32_t
+mlx5_get_send_to_kernel_priority(struct rte_eth_dev *dev)
+{
+       struct mlx5_priv *priv = dev->data->dev_private;
+       uint32_t res;
+
+       switch (priv->sh->flow_max_priority) {
+       case RTE_DIM(priority_map_5):
+               res = 15;
+               break;
+       case RTE_DIM(priority_map_3):
+               res = 7;
+               break;
+       default:
+               DRV_LOG(ERR,
+                       "port %u maximum priority: %d expected 8/16",
+                       dev->data->port_id, priv->sh->flow_max_priority);
+               res = (uint32_t)-1;
+       }
+
+       return res;
+}
+
 /**
  * Get the E-Switch Manager vport id.
  *
diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 860c6cd2ad..f4228a5549 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -1750,6 +1750,7 @@ uint32_t mlx5_get_lowest_priority(struct rte_eth_dev *dev,
 uint16_t mlx5_get_matcher_priority(struct rte_eth_dev *dev,
                                   const struct rte_flow_attr *attr,
                                   uint32_t subpriority, bool external);
+uint32_t mlx5_get_send_to_kernel_priority(struct rte_eth_dev *dev);
 int mlx5_flow_get_reg_id(struct rte_eth_dev *dev,
                                     enum mlx5_feature_name feature,
                                     uint32_t id,
-- 
2.27.0