MdeModulePkg: IP4 should re-initiate a DHCP if it detects network reconnection

v2:
* Update the MediaPresent detect declaring.

IP4 driver should re-initiate a DHCP if it detects that there is a network.
To fix this issue, we can implement the DHCP re-initiate policy while the media
change detected. The Ip4 driver should set a timer to signal the Ip4 to run the
DHCP configuration again(D.O.R.A). IP4 driver should free old IP address related
resource, then initiate a DHCP process to acquire new IP.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Zhang Lubo <lubo.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Lubo Zhang <lubo.zhang@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18232 6f19259b-4bc3-4df7-8a09-765794883524

4 files changed, 133 insertions, 6 deletions

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c
index fcb2bdd..caf84fb 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c
@@ -492,6 +492,7 @@ Ip4Config2SetDefaultAddr (
   ASSERT (IpIf != NULL);

 

   if ((IpIf->Ip == StationAddress) && (IpIf->SubnetMask == SubnetMask)) {

+    IpSb->State = IP4_SERVICE_CONFIGED;

     return EFI_SUCCESS;

   }

 

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
index 101390c..4d3ccec 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
@@ -210,6 +210,10 @@ Ip4CreateService (
 

   IpSb->Timer = NULL;

 

+  IpSb->ReconfigEvent = NULL;

+  

+  IpSb->MediaPresent = TRUE;

+

   //

   // Create various resources. First create the route table, timer

   // event and MNP child. IGMP, interface's initialization depend

@@ -386,6 +390,12 @@ Ip4CleanService (
     IpSb->Timer = NULL;

   }

 

+  if (IpSb->ReconfigEvent != NULL) {

+    gBS->CloseEvent (IpSb->ReconfigEvent);

+

+    IpSb->ReconfigEvent = NULL;

+  }

+

   if (IpSb->MacString != NULL) {

     FreePool (IpSb->MacString);

   }

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c
index 2fb4f4c..ac8fb1a 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c
@@ -563,6 +563,54 @@ Ip4InitProtocol (
 }

 

 

+/**

+  The event handle for IP4 auto reconfiguration. The original default

+  interface and route table will be removed as the default.

+

+  @param[in]  Context                The IP4 service binding instance.

+

+**/

+VOID

+EFIAPI

+Ip4AutoReconfigCallBackDpc (

+  IN VOID                   *Context

+  )

+{

+  IP4_SERVICE               *IpSb;

+

+  IpSb      = (IP4_SERVICE *) Context;

+  NET_CHECK_SIGNATURE (IpSb, IP4_SERVICE_SIGNATURE);

+

+  if (IpSb->State > IP4_SERVICE_UNSTARTED) {

+    IpSb->State = IP4_SERVICE_UNSTARTED;

+  }

+

+  Ip4StartAutoConfig (&IpSb->Ip4Config2Instance);

+

+  return ;

+}

+

+

+/**

+  Request Ip4AutoReconfigCallBackDpc as a DPC at TPL_CALLBACK.

+

+  @param Event     The event that is signalled.

+  @param Context   The IP4 service binding instance.

+

+**/

+VOID

+EFIAPI

+Ip4AutoReconfigCallBack (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  )

+{

+  //

+  // Request Ip4AutoReconfigCallBackDpc as a DPC at TPL_CALLBACK

+  //

+  QueueDpc (TPL_CALLBACK, Ip4AutoReconfigCallBackDpc, Context);

+}

+

 

 /**

   Configure the IP4 child. If the child is already configured,

@@ -678,10 +726,27 @@ Ip4ConfigProtocol (
     // been started, start it.

     //

     if (IpSb->State == IP4_SERVICE_UNSTARTED) {

+      //

+      // Create the ReconfigEvent to start the new configuration.

+      //

+      if (IpSb->ReconfigEvent == NULL) {

+        Status = gBS->CreateEvent (

+                        EVT_NOTIFY_SIGNAL,

+                        TPL_NOTIFY,

+                        Ip4AutoReconfigCallBack,

+                        IpSb,

+                        &IpSb->ReconfigEvent

+                        );

+

+        if (EFI_ERROR (Status)) {

+          goto ON_ERROR;

+        }

+      }

+      

       Status = Ip4StartAutoConfig (&IpSb->Ip4Config2Instance);

 

       if (EFI_ERROR (Status)) {

-        goto ON_ERROR;

+        goto CLOSE_RECONFIG_EVENT;

       }

     }

 

@@ -711,7 +776,7 @@ Ip4ConfigProtocol (
                     EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER

                     );

     if (EFI_ERROR (Status)) {

-      goto ON_ERROR;

+      goto CLOSE_RECONFIG_EVENT;

     }

   }

   InsertTailList (&IpIf->IpInstances, &IpInstance->AddrLink);

@@ -730,6 +795,12 @@ Ip4ConfigProtocol (
 

   return EFI_SUCCESS;

 

+CLOSE_RECONFIG_EVENT:

+  if (IpSb->ReconfigEvent != NULL) {

+    gBS->CloseEvent (IpSb->ReconfigEvent);

+    IpSb->ReconfigEvent = NULL;

+  }

+

 ON_ERROR:

   Ip4FreeRouteTable (IpInstance->RouteTable);

   IpInstance->RouteTable = NULL;

@@ -2295,10 +2366,16 @@ Ip4SentPacketTicking (
 

 

 /**

-  The heart beat timer of IP4 service instance. It times out

-  all of its IP4 children's received-but-not-delivered and

-  transmitted-but-not-recycle packets, and provides time input

-  for its IGMP protocol.

+  There are two steps for this the heart beat timer of IP4 service instance. 

+  First, it times out all of its IP4 children's received-but-not-delivered 

+  and transmitted-but-not-recycle packets, and provides time input for its 

+  IGMP protocol.

+  Second, a dedicated timer is used to poll underlying media status. In case 

+  of cable swap, a new round auto configuration will be initiated. The timer 

+  will signal the IP4 to run DHCP configuration again. IP4 driver will free

+  old IP address related resource, such as route table and Interface, then

+  initiate a DHCP process to acquire new IP, eventually create route table 

+  for new IP address.

 

   @param[in]  Event                  The IP4 service instance's heart beat timer.

   @param[in]  Context                The IP4 service instance.

@@ -2312,10 +2389,42 @@ Ip4TimerTicking (
   )

 {

   IP4_SERVICE               *IpSb;

+  BOOLEAN                   OldMediaPresent;

+  EFI_STATUS                Status;

+  EFI_SIMPLE_NETWORK_MODE   SnpModeData;

 

   IpSb = (IP4_SERVICE *) Context;

   NET_CHECK_SIGNATURE (IpSb, IP4_SERVICE_SIGNATURE);

+  

+  OldMediaPresent = IpSb->MediaPresent;

 

   Ip4PacketTimerTicking (IpSb);

   Ip4IgmpTicking (IpSb);

+

+  //

+  // Get fresh mode data from MNP, since underlying media status may change. 

+  // Here, it needs to mention that the MediaPresent can also be checked even if 

+  // EFI_NOT_STARTED returned while this MNP child driver instance isn't configured.

+  //

+  Status = IpSb->Mnp->GetModeData (IpSb->Mnp, NULL, &SnpModeData);

+  if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {

+    return;

+  }

+

+  IpSb->MediaPresent = SnpModeData.MediaPresent;

+  //

+  // Media transimit Unpresent to Present means new link movement is detected.

+  //

+  if (!OldMediaPresent && IpSb->MediaPresent) {

+    //

+    // Signal the IP4 to run the dhcp configuration again. IP4 driver will free

+    // old IP address related resource, such as route table and Interface, then 

+    // initiate a DHCP round to acquire new IP, eventually 

+    // create route table for new IP address.

+    //

+    if (IpSb->ReconfigEvent != NULL) {

+      Status = gBS->SignalEvent (IpSb->ReconfigEvent);

+      DispatchDpc ();

+    }

+  }

 }

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.h b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.h
index 84dfa80..4bb0089 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.h
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.h
@@ -203,6 +203,13 @@ struct _IP4_SERVICE {
 

   EFI_EVENT                       Timer;

 

+  EFI_EVENT                       ReconfigEvent;

+

+  //

+  // Underlying media present status. 

+  //

+  BOOLEAN                         MediaPresent;

+

   //

   // IPv4 Configuration II Protocol instance

   //