net: config: Add set/get functions

Add set and get functions that return/set either the default
settings or if user has changed them, the user adjusted value.
Make these two functions to use settings API.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

include/zephyr/net/net_config.h

@@ -16,6 +16,12 @@
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/ieee802154_mgmt.h>
 
+#if defined(CONFIG_NET_CONFIG_SETTINGS)
+#include <net_init_config.inc>
+#else
+struct net_init_config;
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -99,6 +105,37 @@ int net_config_init_by_iface(struct net_if *iface, const char *app_info,
  */
 int net_config_init_app(const struct device *dev, const char *app_info);
 
+/* @brief Get network initialization configuration.
+ *
+ * @details This network configuration consists of initial read-only
+ *          configuration and read-write configuration when the
+ *          configuration is changed at runtime.
+ *
+ * @param cfg Caller supplied pointer to struct net_init_config where
+ *            the configuration will be stored.
+ */
+int net_config_get(struct net_init_config *cfg);
+
+/* @brief Set network initialization configuration.
+ *
+ * @details The user supplied configuration is saved to permanent
+ *          storage. How this works:
+ *          - If the config option in struct net_init_config is different
+ *            than the default one, then change the option and enable the _changed flag.
+ *          - If the config option in struct net_init_config is the same
+ *	      as the default one.
+ *
+ * @param cfg Caller supplied pointer to struct net_init_config where
+ *            the configuration will be read.
+ */
+int net_config_set(const struct net_init_config *cfg);
+
+/* @brief Clear all network configuration.
+ *
+ * @details This will reset all runtime configuration back to defaults.
+ */
+int net_config_clear(void);
+
 /**
  * @}
  */

subsys/net/lib/config/CMakeLists.txt

@@ -7,6 +7,9 @@ zephyr_library_compile_definitions_ifdef(
 
 zephyr_library_sources_ifdef(CONFIG_NET_CONFIG_SETTINGS init.c)
 zephyr_library_include_directories(${ZEPHYR_BASE}/subsys/net/ip)
+zephyr_library_include_directories_ifdef(CONFIG_FILE_SYSTEM_LITTLEFS
+  ${ZEPHYR_BASE}/../modules/fs/littlefs
+)
 
 if(CONFIG_NET_CONFIG_SETTINGS)
   zephyr_library_sources_ifdef(

subsys/net/lib/config/Kconfig

@@ -22,6 +22,11 @@ menuconfig NET_CONFIG_SETTINGS
 
 if NET_CONFIG_SETTINGS
 
+config HEAP_MEM_POOL_ADD_SIZE_NET_CONFIG
+	int "Amount of heap needed for storing user configuration data"
+	default 1024
+	depends on SETTINGS
+
 config NET_CONFIG_AUTO_INIT
 	bool "Init networking support automatically during device startup"
 	default y if !(USB_DEVICE_NETWORK || USBD_CDC_ECM_CLASS || USBD_CDC_NCM_CLASS)