net/mlx5: disable config restore

mlx5 PMD does not require configuration restore
on rte_eth_dev_start().
Add implementation of get_restore_flags() indicating that.

Signed-off-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
Acked-by: Ferruh Yigit <ferruh.yigit@amd.com>

drivers/net/mlx5/mlx5.c

@@ -2571,6 +2571,7 @@ const struct eth_dev_ops mlx5_dev_ops = {
 	.count_aggr_ports = mlx5_count_aggr_ports,
 	.map_aggr_tx_affinity = mlx5_map_aggr_tx_affinity,
 	.rx_metadata_negotiate = mlx5_flow_rx_metadata_negotiate,
+	.get_restore_flags = mlx5_get_restore_flags,
 };
 
 /* Available operations from secondary process. */
@@ -2663,6 +2664,7 @@ const struct eth_dev_ops mlx5_dev_ops_isolate = {
 	.get_monitor_addr = mlx5_get_monitor_addr,
 	.count_aggr_ports = mlx5_count_aggr_ports,
 	.map_aggr_tx_affinity = mlx5_map_aggr_tx_affinity,
+	.get_restore_flags = mlx5_get_restore_flags,
 };
 
 /**

drivers/net/mlx5/mlx5.h

@@ -2228,6 +2228,8 @@ eth_rx_burst_t mlx5_select_rx_function(struct rte_eth_dev *dev);
 struct mlx5_priv *mlx5_port_to_eswitch_info(uint16_t port, bool valid);
 struct mlx5_priv *mlx5_dev_to_eswitch_info(struct rte_eth_dev *dev);
 int mlx5_dev_configure_rss_reta(struct rte_eth_dev *dev);
+uint64_t mlx5_get_restore_flags(struct rte_eth_dev *dev,
+				enum rte_eth_dev_operation op);
 
 /* mlx5_ethdev_os.c */
 

drivers/net/mlx5/mlx5_ethdev.c

@@ -796,3 +796,21 @@ mlx5_hairpin_cap_get(struct rte_eth_dev *dev, struct rte_eth_hairpin_cap *cap)
 	cap->tx_cap.rte_memory = hca_attr->hairpin_sq_wq_in_host_mem;
 	return 0;
 }
+
+/**
+ * Indicate to ethdev layer, what configuration must be restored.
+ *
+ * @param[in] dev
+ *   Pointer to Ethernet device structure.
+ * @param[in] op
+ *   Type of operation which might require.
+ * @param[out] flags
+ *   Restore flags will be stored here.
+ */
+uint64_t
+mlx5_get_restore_flags(__rte_unused struct rte_eth_dev *dev,
+		       __rte_unused enum rte_eth_dev_operation op)
+{
+	/* mlx5 PMD does not require any configuration restore. */
+	return 0;
+}