[Patch] NetworkPkg: Recycle the ICMP error message in PXE driver.

[Fu Siyuan <siyuan.fu@intel.com>]

This patch updates PxeBcIcmpErrorDpcHandle() and PxeBcIcmp6ErrorDpcHandle() to
recycle the ICMP packet after copy it to PXE mode data.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Wang Fan <fan.wang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
---
 NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c | 36 +++++++++++++++-------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c b/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
index dfc79a067b..1e77929364 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
@@ -257,8 +257,7 @@ PxeBcIcmpErrorDpcHandle (
     //
     // The return status should be recognized as EFI_ICMP_ERROR.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (EFI_IP4 (RxData->Header->SourceAddress) != 0 &&
@@ -268,24 +267,21 @@ PxeBcIcmpErrorDpcHandle (
     //
     // The source address of the received packet should be a valid unicast address.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (!EFI_IP4_EQUAL (&RxData->Header->DestinationAddress, &Mode->StationIp.v4)) {
     //
     // The destination address of the received packet should be equal to the host address.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (RxData->Header->Protocol != EFI_IP_PROTO_ICMP) {
     //
     // The protocol value in the header of the receveid packet should be EFI_IP_PROTO_ICMP.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   Type = *((UINT8 *) RxData->FragmentTable[0].FragmentBuffer);
@@ -298,8 +294,7 @@ PxeBcIcmpErrorDpcHandle (
     //
     // The type of the receveid ICMP message should be ICMP_ERROR_MESSAGE.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   //
@@ -326,6 +321,9 @@ PxeBcIcmpErrorDpcHandle (
     IcmpError += CopiedLen;
   }
 
+ON_RECYCLE:
+  gBS->SignalEvent (RxData->RecycleSignal);
+
 ON_EXIT:
   Private->IcmpToken.Status = EFI_NOT_READY;
   Ip4->Receive (Ip4, &Private->IcmpToken);
@@ -395,16 +393,14 @@ PxeBcIcmp6ErrorDpcHandle (
     //
     // The return status should be recognized as EFI_ICMP_ERROR.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (!NetIp6IsValidUnicast (&RxData->Header->SourceAddress)) {
     //
     // The source address of the received packet should be a valid unicast address.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (!NetIp6IsUnspecifiedAddr (&Mode->StationIp.v6) &&
@@ -412,16 +408,14 @@ PxeBcIcmp6ErrorDpcHandle (
     //
     // The destination address of the received packet should be equal to the host address.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   if (RxData->Header->NextHeader != IP6_ICMP) {
     //
     // The nextheader in the header of the receveid packet should be IP6_ICMP.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   Type = *((UINT8 *) RxData->FragmentTable[0].FragmentBuffer);
@@ -433,8 +427,7 @@ PxeBcIcmp6ErrorDpcHandle (
     //
     // The type of the receveid packet should be an ICMP6 error message.
     //
-    gBS->SignalEvent (RxData->RecycleSignal);
-    goto ON_EXIT;
+    goto ON_RECYCLE;
   }
 
   //
@@ -461,6 +454,9 @@ PxeBcIcmp6ErrorDpcHandle (
     Icmp6Error += CopiedLen;
   }
 
+ON_RECYCLE:
+  gBS->SignalEvent (RxData->RecycleSignal);
+  
 ON_EXIT:
   Private->Icmp6Token.Status = EFI_NOT_READY;
   Ip6->Receive (Ip6, &Private->Icmp6Token);
-- 
2.13.0.windows.1