测试平台

Platform: RK3399/RK3328
OS: Android 10.0

现象

设置中设置以太网为静态ip，设置后使用ifconfig查看ip显示正常。然后重启，极大概率出现开机后设备没有获取到ip.

分析解决

测试后发现了几点规律:

设置静态ip会开机获取不到ip，但是设置动态ip无问题

没有获取到ip时，使用ifconfig查看，发现网卡设备连接正常。此时拔插网线，或者使用ifconfig eth0 down + ifconfig eth0 up 来开关一次设备后，就能正常获取到ip

根据测试结果采取了如下的解决方案，在开机的时候在Ethernet服务中进行一次ifconfig eth0 down + ifconfig eth0 up的操作来解决.

修改补丁如下，测试20次后无问题，提交给到客户

diff --git a/frameworks/opt/net/ethernet/java/com/android/server/ethernet/EthernetTracker.java b/frameworks/opt/net/ethernet/java/com/android/server/ethernet/EthernetTracker.java

index 308e328..919edc6 100644

--- a/frameworks/opt/net/ethernet/java/com/android/server/ethernet/EthernetTracker.java

+++ b/frameworks/opt/net/ethernet/java/com/android/server/ethernet/EthernetTracker.java

@@ -252,12 +254,41 @@ final class EthernetTracker { 

   

         }

     }

 

-    private void maybeTrackInterface(String iface) { 

   

+    private boolean maybeTrackInterface(String iface) { 

   

         if (DBG) Log.i(TAG, "maybeTrackInterface " + iface);

         // If we don't already track this interface, and if this interface matches

         // our regex, start tracking it.

         if (!iface.matches(mIfaceMatch) || mFactory.hasInterface(iface)) { 

   

-            return;

+            return false;

         }

 

         if (mIpConfigForDefaultInterface != null) { 

   

@@ -266,13 +297,31 @@ final class EthernetTracker { 

   

         }

 

         addInterface(iface);

+        return true;

     }

 

     private void trackAvailableInterfaces() { 

   

         try { 

   

             final String[] ifaces = mNMService.listInterfaces();

             for (String iface : ifaces) { 

   

-                maybeTrackInterface(iface);

+               if (maybeTrackInterface(iface)) { 

   

+                    String mIfaceTmp = iface;

+                    new Thread(new Runnable() { 

   

+                        public void run() { 

   

+                            // carrier is always 1 when kernel boot up no matter RJ45 plugin or not,

+                            // sleep a little time to wait kernel's correct carrier status

+                            try { 

   

+                                Thread.sleep(3000);

+                            } catch (InterruptedException ignore) { 

   

+                            }

+							if(isEthernetInterfaceActive()){ 

   

+                                IpConfiguration config = getIpConfiguration(mIfaceTmp);

+                                if(config != null && IpAssignment.STATIC == config.getIpAssignment())

+                                { 

   

+                                    updateInterfaceState(mIfaceTmp, false);

+                                    updateInterfaceState(mIfaceTmp, true);

+                                }

+                            }else{ 

   

+                                 updateInterfaceState(mIfaceTmp, false);

+                             }

+                        }

+                    }).start();

+                    break;

+                }

             }

         } catch (RemoteException | IllegalStateException e) { 

   

             Log.e(TAG, "Could not get list of interfaces " + e);

注:其实这是种治标不治本的解决办法，但是由于客户追的比较紧先采取这种解决方案，后续有时间再去查一下根本所在(根据测试log等，我猜想这是个由于加载顺序和获取ip的时机导致的随机问题)