[Patch] NetworkPkg: Correct the proxy DHCP offer handing

[Jiaxin Wu <jiaxin.wu@intel.com>]

When PXE10/WFM11a offer received, we should only cache
the first PXE10/WFM11a offer, and discard the others. But
Current we discard all PXE10/WFM11a offer. This patch is
to fix this issue.

Cc: RickF <rfarrington@cavium.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Zhang Lubo <lubo.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c | 5 +++--
 NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
index 5497390..97829e9 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
@@ -1,9 +1,9 @@
 /** @file
   Functions implementation related with DHCPv4 for UefiPxeBc Driver.
 
-  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
 
   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
   http://opensource.org/licenses/bsd-license.php.
@@ -868,11 +868,12 @@ PxeBcCacheDhcp4Offer (
         //
         // Cache all proxy BINL offers.
         //
         Private->OfferIndex[OfferType][Private->OfferCount[OfferType]] = Private->OfferNum;
         Private->OfferCount[OfferType]++;
-      } else if (Private->OfferCount[OfferType] > 0) {
+      } else if ((OfferType == PxeOfferTypeProxyPxe10 || OfferType == PxeOfferTypeProxyWfm11a) && 
+                 Private->OfferCount[OfferType] < 1) {
         //
         // Only cache the first PXE10/WFM11a offer, and discard the others.
         //
         Private->OfferIndex[OfferType][0] = Private->OfferNum;
         Private->OfferCount[OfferType]    = 1;
diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
index a295b82..4cd1770 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
@@ -1,10 +1,10 @@
 /** @file
   Functions implementation related with DHCPv6 for UefiPxeBc Driver.
 
   (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
-  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
 
   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
   http://opensource.org/licenses/bsd-license.php.
@@ -1195,11 +1195,12 @@ PxeBcCacheDhcp6Offer (
       //
       // Cache all proxy BINL offers.
       //
       Private->OfferIndex[OfferType][Private->OfferCount[OfferType]] = Private->OfferNum;
       Private->OfferCount[OfferType]++;
-    } else if (Private->OfferCount[OfferType] > 0) {
+    } else if ((OfferType == PxeOfferTypeProxyPxe10 || OfferType == PxeOfferTypeProxyWfm11a) && 
+                 Private->OfferCount[OfferType] < 1) {
       //
       // Only cache the first PXE10/WFM11a offer, and discard the others.
       //
       Private->OfferIndex[OfferType][0] = Private->OfferNum;
       Private->OfferCount[OfferType]    = 1;
-- 
1.9.5.msysgit.1