1. Fix a bug in PXE driver that the PXE boot do not restart if a new boot option on the different IP stack is selected.

2. Retrieve the IP information after iSCSI TCPv6 connection established and fill it into iBFT table.
3. Generate a random IAID for each NIC port to require different IPv6 address in PXE driver.
4. Update function EfiMtftp6Configure() and Mtftp6RrqHandleOack() to allocate at most one UdpIo.
5. Fix a typo from “destory” to “destroy” in network code.

Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Ouyang Qian <qian.ouyang@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13859 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c

@@ -1,7 +1,7 @@
 /** @file
   Driver Binding functions implementationfor for UefiPxeBc Driver.
 
-  Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2007 - 2012, 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
@@ -779,6 +779,7 @@ PxeBcCreateIp6Children (
   EFI_IP6_MODE_DATA               Ip6ModeData;
   PXEBC_PRIVATE_PROTOCOL          *Id;
   EFI_SIMPLE_NETWORK_PROTOCOL     *Snp;
+  UINTN                           Index;
 
   if (Private->Ip6Nic != NULL) {
     //
@@ -821,6 +822,16 @@ PxeBcCreateIp6Children (
     goto ON_ERROR;
   }
 
+  //
+  // Generate a random IAID for the Dhcp6 assigned address.
+  //
+  Private->IaId = NET_RANDOM (NetRandomInitSeed ());
+  if (Private->Snp != NULL) {
+    for (Index = 0; Index < Private->Snp->Mode->HwAddressSize; Index++) {
+      Private->IaId |= (Private->Snp->Mode->CurrentAddress.Addr[Index] << ((Index << 3) & 31));
+    }  
+  }
+
   //
   // Create Mtftp6 child and open Mtftp6 protocol for PxeBc->Mtftp.
   //