文章：
https://blog.csdn.net/IT_xiao_bai0516/article/details/122129925

SOC MAC驱动：
drivers/net/phy/phylink.c

PHY驱动：
厂商提供

SOC-RGMII-PHY方式，需要确认时钟

安卓层：
获取状态过程：

• packages/modules/Connectivity/framework-t/src/android/net/EthernetManager.java

  • EthernetManager isAvailable 上层：提供给应用接口

• packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetServiceImpl.java

  • EthernetService isAvailable 服务层

   mTracker.isTrackingInterface(iface);	
  

• packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetTracker.java

  • isTrackingInterface return mFactory.hasInterface(iface);

• packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java

  • hasInterface return mTrackingInterfaces.containsKey(ifaceName);

更新状态过程：

• packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java
  • EthernetNetworkFactory updateInterfaceLinkState 最后会更新键值

原生Settings

packages/apps/Settings/src/com/android/settings/network/telephony/NetworkSelectSettings.java
控件

public boolean onPreferenceTreeClick(Preference preference) {