For network dynamic media support:

1. add library function NetLibDetectMedia to NetLib for media detection
2. update MnpDxe to periodically poll for media status update and check for media status before packet transmit
3. update Ip4Dxe to return ModeData using Mnp->GetModeData()
4. update IScsiDxe to check for media status before try to do DHCP and session login
5. update UefiPxeBcDxe to check for media status before PXE start

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9919 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Library/NetLib.h

@@ -1092,6 +1092,40 @@ NetLibGetMacString (
   OUT CHAR16                **MacString
   );
 
+/**
+  Detect media status for specified network device.
+
+  The underlying UNDI driver may or may not support reporting media status from
+  GET_STATUS command (PXE_STATFLAGS_GET_STATUS_NO_MEDIA_SUPPORTED). This routine
+  will try to invoke Snp->GetStatus() to get the media status: if media already
+  present, it return directly; if media not present, it will stop SNP and then
+  restart SNP to get the latest media status, this give chance to get the correct
+  media status for old UNDI driver which doesn't support reporting media status
+  from GET_STATUS command.
+  Note: there will be two limitations for current algorithm:
+  1) for UNDI with this capability, in case of cable is not attached, there will
+     be an redundant Stop/Start() process;
+  2) for UNDI without this capability, in case cable is attached in UNDI
+     initialize while unattached latter, NetLibDetectMedia() will report
+     MediaPresent as TRUE, this cause upper layer apps wait for timeout time.
+
+  @param[in]   ServiceHandle    The handle where network service binding protocols are
+                                installed on.
+  @param[out]  MediaPresent     The pointer to store the media status.
+
+  @retval EFI_SUCCESS           Media detection success.
+  @retval EFI_INVALID_PARAMETER ServiceHandle is not valid network device handle.
+  @retval EFI_UNSUPPORTED       Network device does not support media detection.
+  @retval EFI_DEVICE_ERROR      SNP is in unknown state.
+
+**/
+EFI_STATUS
+EFIAPI
+NetLibDetectMedia (
+  IN  EFI_HANDLE            ServiceHandle,
+  OUT BOOLEAN               *MediaPresent
+  );
+
 /**
   Create an IPv4 device path node.
 

MdeModulePkg/Library/DxeNetLib/DxeNetLib.c

@@ -2145,6 +2145,213 @@ NetLibGetMacString (
   return EFI_SUCCESS;
 }
 
+/**
+  Detect media status for specified network device.
+
+  The underlying UNDI driver may or may not support reporting media status from
+  GET_STATUS command (PXE_STATFLAGS_GET_STATUS_NO_MEDIA_SUPPORTED). This routine
+  will try to invoke Snp->GetStatus() to get the media status: if media already
+  present, it return directly; if media not present, it will stop SNP and then
+  restart SNP to get the latest media status, this give chance to get the correct
+  media status for old UNDI driver which doesn't support reporting media status
+  from GET_STATUS command.
+  Note: there will be two limitations for current algorithm:
+  1) for UNDI with this capability, in case of cable is not attached, there will
+     be an redundant Stop/Start() process;
+  2) for UNDI without this capability, in case cable is attached in UNDI
+     initialize while unattached latter, NetLibDetectMedia() will report
+     MediaPresent as TRUE, this cause upper layer apps wait for timeout time.
+
+  @param[in]   ServiceHandle    The handle where network service binding protocols are
+                                installed on.
+  @param[out]  MediaPresent     The pointer to store the media status.
+
+  @retval EFI_SUCCESS           Media detection success.
+  @retval EFI_INVALID_PARAMETER ServiceHandle is not valid network device handle.
+  @retval EFI_UNSUPPORTED       Network device does not support media detection.
+  @retval EFI_DEVICE_ERROR      SNP is in unknown state.
+
+**/
+EFI_STATUS
+EFIAPI
+NetLibDetectMedia (
+  IN  EFI_HANDLE            ServiceHandle,
+  OUT BOOLEAN               *MediaPresent
+  )
+{
+  EFI_STATUS                   Status;
+  EFI_HANDLE                   SnpHandle;
+  EFI_SIMPLE_NETWORK_PROTOCOL  *Snp;
+  UINT32                       InterruptStatus;
+  UINT32                       OldState;
+  EFI_MAC_ADDRESS              *MCastFilter;
+  UINT32                       MCastFilterCount;
+  UINT32                       EnableFilterBits;
+  UINT32                       DisableFilterBits;
+  BOOLEAN                      ResetMCastFilters;
+
+  ASSERT (MediaPresent != NULL);
+
+  //
+  // Get SNP handle
+  //
+  Snp = NULL;
+  SnpHandle = NetLibGetSnpHandle (ServiceHandle, &Snp);
+  if (SnpHandle == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Check whether SNP support media detection
+  //
+  if (!Snp->Mode->MediaPresentSupported) {
+    return EFI_UNSUPPORTED;
+  }
+
+  //
+  // Invoke Snp->GetStatus() to refresh MediaPresent field in SNP mode data
+  //
+  Status = Snp->GetStatus (Snp, &InterruptStatus, NULL);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (Snp->Mode->MediaPresent) {
+    //
+    // Media is present, return directly
+    //
+    *MediaPresent = TRUE;
+    return EFI_SUCCESS;
+  }
+
+  //
+  // Till now, GetStatus() report no media; while, in case UNDI not support
+  // reporting media status from GetStatus(), this media status may be incorrect.
+  // So, we will stop SNP and then restart it to get the correct media status.
+  //
+  OldState = Snp->Mode->State;
+  if (OldState >= EfiSimpleNetworkMaxState) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  MCastFilter = NULL;
+
+  if (OldState == EfiSimpleNetworkInitialized) {
+    //
+    // SNP is already in use, need Shutdown/Stop and then Start/Initialize
+    //
+
+    //
+    // Backup current SNP receive filter settings
+    //
+    EnableFilterBits  = Snp->Mode->ReceiveFilterSetting;
+    DisableFilterBits = Snp->Mode->ReceiveFilterMask ^ EnableFilterBits;
+
+    ResetMCastFilters = TRUE;
+    MCastFilterCount  = Snp->Mode->MCastFilterCount;
+    if (MCastFilterCount != 0) {
+      MCastFilter = AllocateCopyPool (
+                      MCastFilterCount * sizeof (EFI_MAC_ADDRESS),
+                      Snp->Mode->MCastFilter
+                      );
+      ASSERT (MCastFilter != NULL);
+
+      ResetMCastFilters = FALSE;
+    }
+
+    //
+    // Shutdown/Stop the simple network
+    //
+    Status = Snp->Shutdown (Snp);
+    if (!EFI_ERROR (Status)) {
+      Status = Snp->Stop (Snp);
+    }
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    //
+    // Start/Initialize the simple network
+    //
+    Status = Snp->Start (Snp);
+    if (!EFI_ERROR (Status)) {
+      Status = Snp->Initialize (Snp, 0, 0);
+    }
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    //
+    // Here we get the correct media status
+    //
+    *MediaPresent = Snp->Mode->MediaPresent;
+
+    //
+    // Restore SNP receive filter settings
+    //
+    Status = Snp->ReceiveFilters (
+                    Snp,
+                    EnableFilterBits,
+                    DisableFilterBits,
+                    ResetMCastFilters,
+                    MCastFilterCount,
+                    MCastFilter
+                    );
+
+    if (MCastFilter != NULL) {
+      FreePool (MCastFilter);
+    }
+
+    return Status;
+  }
+
+  //
+  // SNP is not in use, it's in state of EfiSimpleNetworkStopped or EfiSimpleNetworkStarted
+  //
+  if (OldState == EfiSimpleNetworkStopped) {
+    //
+    // SNP not start yet, start it
+    //
+    Status = Snp->Start (Snp);
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+  }
+
+  //
+  // Initialize the simple network
+  //
+  Status = Snp->Initialize (Snp, 0, 0);
+  if (EFI_ERROR (Status)) {
+    Status = EFI_DEVICE_ERROR;
+    goto Exit;
+  }
+
+  //
+  // Here we get the correct media status
+  //
+  *MediaPresent = Snp->Mode->MediaPresent;
+
+  //
+  // Shut down the simple network
+  //
+  Snp->Shutdown (Snp);
+
+Exit:
+  if (OldState == EfiSimpleNetworkStopped) {
+    //
+    // Original SNP sate is Stopped, restore to original state
+    //
+    Snp->Stop (Snp);
+  }
+
+  if (MCastFilter != NULL) {
+    FreePool (MCastFilter);
+  }
+
+  return Status;
+}
+
 /**
   Check the default address used by the IPv4 driver is static or dynamic (acquired
   from DHCP).

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.c

@@ -770,6 +770,7 @@ ON_EXIT:
   @retval EFI_ALREADY_STARTED   Some other EFI DHCPv4 Protocol instance already started the
                                 DHCP process.
   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.
+  @retval EFI_NO_MEDIA          There was a media error.
 
 **/
 EFI_STATUS

MdeModulePkg/Universal/Network/IScsiDxe/IScsiDhcp.c

@@ -1,7 +1,7 @@
 /** @file
   iSCSI DHCP related configuration routines.
 
-Copyright (c) 2004 - 2009, Intel Corporation.<BR>
+Copyright (c) 2004 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -344,7 +344,9 @@ IScsiParseDhcpAck (
 
   @retval EFI_SUCCESS           The DNS information is got from the DHCP ACK.
   @retval EFI_OUT_OF_RESOURCES  Failed to allocate memory.
+  @retval EFI_NO_MEDIA          There was a media error.
   @retval Others                Other errors as indicated.
+
 **/
 EFI_STATUS
 IScsiDoDhcp (
@@ -358,11 +360,21 @@ IScsiDoDhcp (
   EFI_STATUS              Status;
   EFI_DHCP4_PACKET_OPTION *ParaList;
   EFI_DHCP4_CONFIG_DATA   Dhcp4ConfigData;
+  BOOLEAN                 MediaPresent;
 
   Dhcp4Handle = NULL;
   Dhcp4       = NULL;
   ParaList    = NULL;
 
+  //
+  // Check media status before do DHCP
+  //
+  MediaPresent = TRUE;
+  NetLibDetectMedia (Controller, &MediaPresent);
+  if (!MediaPresent) {
+    return EFI_NO_MEDIA;
+  }
+
   //
   // Create a DHCP4 child instance and get the protocol.
   //

MdeModulePkg/Universal/Network/IScsiDxe/IScsiDhcp.h

@@ -1,7 +1,7 @@
 /** @file
   The header file of IScsiDhcp.
 
-Copyright (c) 2004 - 2009, Intel Corporation.<BR>
+Copyright (c) 2004 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -47,7 +47,9 @@ typedef struct _ISCSI_ROOT_PATH_FIELD {
 
   @retval EFI_SUCCESS           The DNS information is got from the DHCP ACK.
   @retval EFI_OUT_OF_RESOURCES  Failed to allocate memory.
+  @retval EFI_NO_MEDIA          There was a media error.
   @retval Others                Other errors as indicated.
+
 **/
 EFI_STATUS
 IScsiDoDhcp (

MdeModulePkg/Universal/Network/IScsiDxe/IScsiProto.c

@@ -1,7 +1,7 @@
 /** @file
   The implementation of iSCSI protocol based on RFC3720.
 
-Copyright (c) 2004 - 2009, Intel Corporation.<BR>
+Copyright (c) 2004 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -276,7 +276,9 @@ IScsiDestroyConnection (
 
   @retval EFI_SUCCESS          The iSCSI session login procedure finished.
   @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+  @retval EFI_NO_MEDIA         There was a media error.
   @retval Others               Other errors as indicated.
+
 **/
 EFI_STATUS
 IScsiSessionLogin (
@@ -287,9 +289,19 @@ IScsiSessionLogin (
   ISCSI_SESSION     *Session;
   ISCSI_CONNECTION  *Conn;
   EFI_TCP4_PROTOCOL *Tcp4;
+  BOOLEAN           MediaPresent;
 
   Session = &Private->Session;
 
+  //
+  // Check media status before session login
+  //
+  MediaPresent = TRUE;
+  NetLibDetectMedia (Private->Controller, &MediaPresent);
+  if (!MediaPresent) {
+    return EFI_NO_MEDIA;
+  }
+
   //
   // Create a connection for the session.
   //

MdeModulePkg/Universal/Network/IScsiDxe/IScsiProto.h

@@ -1,7 +1,7 @@
 /** @file
   The header file of iSCSI Protocol that defines many specific data structures.
 
-Copyright (c) 2004 - 2009, Intel Corporation.<BR>
+Copyright (c) 2004 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -692,7 +692,9 @@ IScsiDestroyConnection (
 
   @retval EFI_SUCCESS          The iSCSI session login procedure finished.
   @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+  @retval EFI_NO_MEDIA         There was a media error.
   @retval Others               Other errors as indicated.
+
 **/
 EFI_STATUS
 IScsiSessionLogin (

MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c

@@ -440,16 +440,13 @@ EfiIp4GetModeData (
     }
   }
 
-  if (MnpConfigData != NULL) {
+  //
-    CopyMem (MnpConfigData, &IpSb->MnpConfigData, sizeof (*MnpConfigData));
+  // Get fresh mode data from MNP, since underlying media status may change
-  }
+  //
-
+  Status = IpSb->Mnp->GetModeData (IpSb->Mnp, MnpConfigData, SnpModeData);
-  if (SnpModeData != NULL) {
-    CopyMem (SnpModeData, &IpSb->SnpMode, sizeof (*SnpModeData));
-  }
 
   gBS->RestoreTPL (OldTpl);
-  return EFI_SUCCESS;
+  return Status;
 }
 
 

MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c

@@ -1,7 +1,7 @@
 /** @file
   Implementation of Managed Network Protocol private services.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -355,6 +355,22 @@ MnpInitializeDeviceData (
     goto ERROR;
   }
 
+  //
+  // Create the timer for media detection.
+  //
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_SIGNAL | EVT_TIMER,
+                  TPL_CALLBACK,
+                  MnpCheckMediaStatus,
+                  MnpDeviceData,
+                  &MnpDeviceData->MediaDetectTimer
+                  );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "MnpInitializeDeviceData: CreateEvent for media detection failed.\n"));
+
+    goto ERROR;
+  }
+
   //
   // Create the timer for tx timeout check.
   //
@@ -382,6 +398,10 @@ ERROR:
       gBS->CloseEvent (MnpDeviceData->TimeoutCheckTimer);
     }
 
+    if (MnpDeviceData->MediaDetectTimer != NULL) {
+      gBS->CloseEvent (MnpDeviceData->MediaDetectTimer);
+    }
+
     if (MnpDeviceData->PollTimer != NULL) {
       gBS->CloseEvent (MnpDeviceData->PollTimer);
     }
@@ -443,9 +463,10 @@ MnpDestroyDeviceData (
   //
   // Close the event.
   //
-  gBS->CloseEvent (&MnpDeviceData->TxTimeoutEvent);
+  gBS->CloseEvent (MnpDeviceData->TxTimeoutEvent);
-  gBS->CloseEvent (&MnpDeviceData->TimeoutCheckTimer);
+  gBS->CloseEvent (MnpDeviceData->TimeoutCheckTimer);
-  gBS->CloseEvent (&MnpDeviceData->PollTimer);
+  gBS->CloseEvent (MnpDeviceData->MediaDetectTimer);
+  gBS->CloseEvent (MnpDeviceData->PollTimer);
 
   //
   // Free the tx buffer.
@@ -1010,6 +1031,24 @@ MnpStart (
 
         goto ErrorExit;
       }
+
+      //
+      // Start the media detection timer.
+      //
+      Status = gBS->SetTimer (
+                      MnpDeviceData->MediaDetectTimer,
+                      TimerPeriodic,
+                      MNP_MEDIA_DETECT_INTERVAL
+                      );
+      if (EFI_ERROR (Status)) {
+        DEBUG (
+          (EFI_D_ERROR,
+          "MnpStart, gBS->SetTimer for MediaDetectTimer %r.\n",
+          Status)
+          );
+
+        goto ErrorExit;
+      }
     }
   }
 
@@ -1095,6 +1134,11 @@ MnpStop (
   //
   Status = gBS->SetTimer (MnpDeviceData->TimeoutCheckTimer, TimerCancel, 0);
 
+  //
+  // Cancel the media detect timer.
+  //
+  Status = gBS->SetTimer (MnpDeviceData->MediaDetectTimer, TimerCancel, 0);
+
   //
   // Stop the simple network.
   //

MdeModulePkg/Universal/Network/MnpDxe/MnpDriver.c

@@ -1,7 +1,7 @@
 /** @file
   Implementation of driver entry point and driver binding protocol.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -336,7 +336,7 @@ MnpDriverBindingStop (
     }
 
     //
-    // Destroy the Mnp device data
+    // Destroy Mnp Device Data
     //
     MnpDestroyDeviceData (MnpDeviceData, This->DriverBindingHandle);
     FreePool (MnpDeviceData);

MdeModulePkg/Universal/Network/MnpDxe/MnpDriver.h

@@ -1,7 +1,7 @@
 /** @file
   Declaration of strctures and functions for MnpDxe driver.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -70,6 +70,7 @@ typedef struct {
   BOOLEAN                       EnableSystemPoll;
 
   EFI_EVENT                     TimeoutCheckTimer;
+  EFI_EVENT                     MediaDetectTimer;
 
   UINT32                        UnicastCount;
   UINT32                        BroadcastCount;

MdeModulePkg/Universal/Network/MnpDxe/MnpImpl.h

@@ -1,7 +1,7 @@
 /** @file
   Declaration of structures and functions of MnpDxe driver.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -22,6 +22,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #define MNP_SYS_POLL_INTERVAL         (10 * TICKS_PER_MS)   // 10 milliseconds
 #define MNP_TIMEOUT_CHECK_INTERVAL    (50 * TICKS_PER_MS)   // 50 milliseconds
+#define MNP_MEDIA_DETECT_INTERVAL     (500 * TICKS_PER_MS)  // 500 milliseconds
 #define MNP_TX_TIMEOUT_TIME           (500 * TICKS_PER_MS)  // 500 milliseconds
 #define MNP_INIT_NET_BUFFER_NUM       512
 #define MNP_NET_BUFFER_INCREASEMENT   64
@@ -448,9 +449,8 @@ MnpFreeNbuf (
 /**
   Remove the received packets if timeout occurs.
 
-  @param[in]  Event             The event this notify function registered to.
+  @param[in]  Event        The event this notify function registered to.
-  @param[in]  Context           Pointer to the context data registered to the
+  @param[in]  Context      Pointer to the context data registered to the event.
-                                event.
 
 **/
 VOID
@@ -460,19 +460,33 @@ MnpCheckPacketTimeout (
   IN VOID          *Context
   );
 
+/**
+  Poll to update MediaPresent field in SNP ModeData by Snp.GetStatus().
+
+  @param[in]  Event        The event this notify function registered to.
+  @param[in]  Context      Pointer to the context data registered to the event.
+
+**/
+VOID
+EFIAPI
+MnpCheckMediaStatus (
+  IN EFI_EVENT     Event,
+  IN VOID          *Context
+  );
+
 /**
   Poll to receive the packets from Snp. This function is either called by upperlayer
   protocols/applications or the system poll timer notify mechanism.
 
-  @param[in]       Event        The event this notify function registered to.
+  @param[in]  Event        The event this notify function registered to.
-  @param[in, out]  Context      Pointer to the context data registered to the event.
+  @param[in]  Context      Pointer to the context data registered to the event.
 
 **/
 VOID
 EFIAPI
 MnpSystemPoll (
-  IN     EFI_EVENT   Event,
+  IN EFI_EVENT     Event,
-  IN OUT VOID        *Context
+  IN VOID          *Context
   );
 
 /**

MdeModulePkg/Universal/Network/MnpDxe/MnpIo.c

@@ -1,7 +1,7 @@
 /** @file
   Implementation of Managed Network Protocol I/O functions.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -210,6 +210,18 @@ MnpSyncSendPacket (
 
   HeaderSize    = Snp->Mode->MediaHeaderSize - TxData->HeaderLength;
 
+  //
+  // Check media status before transmit packet.
+  // Note: media status will be updated by periodic timer MediaDetectTimer.
+  //
+  if (!Snp->Mode->MediaPresent) {
+    //
+    // Media not present, skip packet transmit and report EFI_NO_MEDIA
+    //
+    Status = EFI_NO_MEDIA;
+    goto SIGNAL_TOKEN;
+  }
+
   //
   // Start the timeout event.
   //
@@ -998,9 +1010,8 @@ EXIT:
 /**
   Remove the received packets if timeout occurs.
 
-  @param[in]  Event             The event this notify function registered to.
+  @param[in]  Event        The event this notify function registered to.
-  @param[in]  Context           Pointer to the context data registered to the
+  @param[in]  Context      Pointer to the context data registered to the event.
-                                event.
 
 **/
 VOID
@@ -1065,19 +1076,50 @@ MnpCheckPacketTimeout (
   }
 }
 
+/**
+  Poll to update MediaPresent field in SNP ModeData by Snp->GetStatus().
+
+  @param[in]  Event        The event this notify function registered to.
+  @param[in]  Context      Pointer to the context data registered to the event.
+
+**/
+VOID
+EFIAPI
+MnpCheckMediaStatus (
+  IN EFI_EVENT     Event,
+  IN VOID          *Context
+  )
+{
+  MNP_DEVICE_DATA             *MnpDeviceData;
+  EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
+  UINT32                      InterruptStatus;
+
+  MnpDeviceData = (MNP_DEVICE_DATA *) Context;
+  NET_CHECK_SIGNATURE (MnpDeviceData, MNP_DEVICE_DATA_SIGNATURE);
+
+  Snp = MnpDeviceData->Snp;
+  if (Snp->Mode->MediaPresentSupported) {
+    //
+    // Upon successful return of GetStatus(), the MediaPresent field of
+    // EFI_SIMPLE_NETWORK_MODE will be updated to reflect any change of media status
+    //
+    Snp->GetStatus (Snp, &InterruptStatus, NULL);
+  }
+}
+
 /**
   Poll to receive the packets from Snp. This function is either called by upperlayer
   protocols/applications or the system poll timer notify mechanism.
 
-  @param[in]       Event        The event this notify function registered to.
+  @param[in]  Event        The event this notify function registered to.
-  @param[in, out]  Context      Pointer to the context data registered to the event.
+  @param[in]  Context      Pointer to the context data registered to the event.
 
 **/
 VOID
 EFIAPI
 MnpSystemPoll (
-  IN     EFI_EVENT   Event,
+  IN EFI_EVENT     Event,
-  IN OUT VOID        *Context
+  IN VOID          *Context
   )
 {
   MNP_DEVICE_DATA  *MnpDeviceData;

MdeModulePkg/Universal/Network/MnpDxe/MnpMain.c

@@ -1,7 +1,7 @@
 /** @file
   Implementation of Managed Network Protocol public services.
 
-Copyright (c) 2005 - 2009, Intel Corporation.<BR>
+Copyright (c) 2005 - 2010, Intel Corporation.<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
@@ -52,6 +52,7 @@ MnpGetModeData (
   EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
   EFI_TPL                     OldTpl;
   EFI_STATUS                  Status;
+  UINT32                      InterruptStatus;
 
   if (This == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -73,6 +74,12 @@ MnpGetModeData (
     // Copy the underlayer Snp mode data.
     //
     Snp = Instance->MnpServiceData->MnpDeviceData->Snp;
+
+    //
+    // Upon successful return of GetStatus(), the Snp->Mode->MediaPresent
+    // will be updated to reflect any change of media status
+    //
+    Snp->GetStatus (Snp, &InterruptStatus, NULL);
     CopyMem (SnpModeData, Snp->Mode, sizeof (*SnpModeData));
   }
 

MdeModulePkg/Universal/Network/Mtftp4Dxe/Mtftp4Impl.c

@@ -1,7 +1,7 @@
 /** @file
   Interface routine for Mtftp4.
   
-Copyright (c) 2006 - 2009, Intel Corporation<BR>
+Copyright (c) 2006 - 2010, Intel Corporation<BR>
 All rights reserved. This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -776,6 +776,7 @@ EfiMtftp4ParseOptions (
   @retval EFI_TIMEOUT           No responses were received from the MTFTPv4 server.
   @retval EFI_TFTP_ERROR        An MTFTPv4 ERROR packet was received.
   @retval EFI_DEVICE_ERROR      An unexpected network error or system error occurred.
+  @retval EFI_NO_MEDIA          There was a media error.
 
 **/
 EFI_STATUS
@@ -971,6 +972,7 @@ EfiMtftp4ReadDirectory (
                                  in the Buffer.
   @retval EFI_TIMEOUT            No responses were received from the MTFTPv4 server.
   @retval EFI_DEVICE_ERROR       An unexpected network error or system error occurred.
+  @retval EFI_NO_MEDIA           There was a media error.
 
 **/
 EFI_STATUS

MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcImpl.c

@@ -2585,6 +2585,7 @@ EfiPxeLoadFile (
   BOOLEAN                     NewMakeCallback;
   EFI_STATUS                  Status;
   UINT64                      TmpBufSize;
+  BOOLEAN                     MediaPresent;
 
   Private         = PXEBC_PRIVATE_DATA_FROM_LOADFILE (This);
   PxeBc           = &Private->PxeBc;
@@ -2603,6 +2604,15 @@ EfiPxeLoadFile (
     return EFI_UNSUPPORTED;
   }
 
+  //
+  // Check media status before PXE start
+  //
+  MediaPresent = TRUE;
+  NetLibDetectMedia (Private->Controller, &MediaPresent);
+  if (!MediaPresent) {
+    return EFI_NO_MEDIA;
+  }
+
   Status = PxeBc->Start (PxeBc, FALSE);
   if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
     return Status;