[edk2-devel] [PATCH] RedfishPkg/RedfishDiscoverDxe: EFI Redfish Discover Protocol

Nickle Wang nickle.wang at hpe.com
Mon Apr 12 03:46:28 UTC 2021


Reviewed-by: Nickle Wang <nickle.wang at hpe.com>

Thanks,
Nickle

-----Original Message-----
From: Chang, Abner (HPS SW/FW Technologist) <abner.chang at hpe.com> 
Sent: Friday, March 26, 2021 12:54 PM
To: devel at edk2.groups.io
Cc: Wang, Nickle (HPS SW) <nickle.wang at hpe.com>; Jiaxin Wu <jiaxin.wu at intel.com>; Siyuan Fu <siyuan.fu at intel.com>; Fan Wang <fan.wang at intel.com>; Jiewen Yao <jiewen.yao at intel.com>
Subject: [PATCH] RedfishPkg/RedfishDiscoverDxe: EFI Redfish Discover Protocol

EDK2 EFI Redfish Discover Protocol implementation. Refer to UEFI spec 2.9
section 31.1.

Signed-off-by: Abner Chang <abner.chang at hpe.com>
Cc: Nickle Wang <nickle.wang at hpe.com>
Cc: Jiaxin Wu <jiaxin.wu at intel.com>
Cc: Siyuan Fu <siyuan.fu at intel.com>
Cc: Fan Wang <fan.wang at intel.com>
Cc: Jiewen Yao <jiewen.yao at intel.com>
---
 RedfishPkg/RedfishComponents.dsc.inc          |    3 +-
 RedfishPkg/Redfish.fdf.inc                    |    3 +-
 .../RedfishDiscoverDxe/RedfishDiscoverDxe.inf |   55 +
 .../RedfishDiscoverInternal.h                 |  234 ++
 RedfishPkg/RedfishDiscoverDxe/ComponentName.c |  218 ++
 .../RedfishDiscoverDxe/RedfishDiscoverDxe.c   | 1910 +++++++++++++++++
 .../RedfishSmbiosHostInterface.c              |  118 +
 7 files changed, 2539 insertions(+), 2 deletions(-)
 create mode 100644 RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf
 create mode 100644 RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverInternal.h
 create mode 100644 RedfishPkg/RedfishDiscoverDxe/ComponentName.c
 create mode 100644 RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.c
 create mode 100644 RedfishPkg/RedfishDiscoverDxe/RedfishSmbiosHostInterface.c

diff --git a/RedfishPkg/RedfishComponents.dsc.inc b/RedfishPkg/RedfishComponents.dsc.inc
index 08f1d3bc32..6f3b055aba 100644
--- a/RedfishPkg/RedfishComponents.dsc.inc
+++ b/RedfishPkg/RedfishComponents.dsc.inc
@@ -6,7 +6,7 @@
 # of EDKII Redfish drivers according to the value of flags described in
 # "RedfishDefines.dsc.inc".
 #
-# (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+# (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -17,4 +17,5 @@
   RedfishPkg/RedfishHostInterfaceDxe/RedfishHostInterfaceDxe.inf
   RedfishPkg/RedfishRestExDxe/RedfishRestExDxe.inf
   RedfishPkg/RedfishCredentialDxe/RedfishCredentialDxe.inf
+  RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf
 !endif
diff --git a/RedfishPkg/Redfish.fdf.inc b/RedfishPkg/Redfish.fdf.inc
index a64fd119a9..205c3101c0 100644
--- a/RedfishPkg/Redfish.fdf.inc
+++ b/RedfishPkg/Redfish.fdf.inc
@@ -5,7 +5,7 @@
 # by using "!include RedfishPkg/RedfisLibs.fdf.inc" to specify the module instances
 # to be built in the firmware volume.
 #
-# (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+# (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -15,4 +15,5 @@
   INF RedfishPkg/RedfishHostInterfaceDxe/RedfishHostInterfaceDxe.inf
   INF RedfishPkg/RedfishRestExDxe/RedfishRestExDxe.inf
   INF RedfishPkg/RedfishCredentialDxe/RedfishCredentialDxe.inf
+  INF RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf
 !endif
diff --git a/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf
new file mode 100644
index 0000000000..345bacf44d
--- /dev/null
+++ b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.inf
@@ -0,0 +1,55 @@
+## @file
+#  Implementation of EFI_REDFISH_DISCOVER_PROTOCOL interfaces.
+#
+#  (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION               = 0x0001001b
+  BASE_NAME                 = RedfishDiscoverDxe
+  FILE_GUID                 = 28A76FE5-43D7-48A3-9714-C1B7BDD6DFB6
+  MODULE_TYPE               = UEFI_DRIVER
+  VERSION_STRING            = 1.0
+  ENTRY_POINT               = RedfishDiscoverEntryPoint
+  UNLOAD_IMAGE              = RedfishDiscoverUnload
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  NetworkPkg/NetworkPkg.dec
+  RedfishPkg/RedfishPkg.dec
+
+[Sources]
+  ComponentName.c
+  RedfishDiscoverDxe.c
+  RedfishSmbiosHostInterface.c
+  RedfishDiscoverInternal.h
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  MemoryAllocationLib
+  PrintLib
+  RestExLib
+  UefiLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+
+[Protocols]
+  gEfiRestExServiceBindingProtocolGuid            ## Consuming
+  gEfiRestExProtocolGuid                          ## Consuming
+  gEfiTcp4ServiceBindingProtocolGuid              ## Consuming
+  gEfiTcp4ProtocolGuid                            ## Consuming
+  gEfiTcp6ServiceBindingProtocolGuid              ## Consuming
+  gEfiTcp6ProtocolGuid                            ## Consuming
+  gEfiRedfishDiscoverProtocolGuid                 ## Prodcuing
+  gEfiSmbiosProtocolGuid                          ## Consuming
+  gEfiDriverBindingProtocolGuid                   ## Consuming
+
+[Pcd]
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishDiscoverAccessModeInBand ## CONSUMES
+
diff --git a/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverInternal.h b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverInternal.h
new file mode 100644
index 0000000000..cf69d9231a
--- /dev/null
+++ b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverInternal.h
@@ -0,0 +1,234 @@
+/** @file
+  This file defines the EFI Redfish Discover Protocol interface.
+
+  (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EFI_REDFISH_DISCOVER_INTERNAL_H_
+#define EFI_REDFISH_DISCOVER_INTERNAL_H_
+
+#include <Uefi.h>
+
+#include <Protocol/ComponentName.h>
+#include <Protocol/ComponentName2.h>
+#include <Protocol/DriverBinding.h>
+#include <Protocol/RedfishDiscover.h>
+#include <Protocol/Smbios.h>
+#include <Protocol/Tcp4.h>
+#include <Protocol/Tcp6.h>
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/NetLib.h>
+#include <Library/PrintLib.h>
+#include <Library/RestExLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+
+#include <IndustryStandard/RedfishHostInterface.h>
+
+#define REDFISH_DISCOVER_VERSION  0x00010000
+#define EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_TPL TPL_NOTIFY
+
+//
+//GUID definitions
+//
+
+#define EFI_REDFISH_DISCOVER_TCP4_INSTANCE_GUID \
+  { \
+    0xfbab97a4, 0x4c6a, 0xf8e8, { 0xf2, 0x25, 0x42, 0x8a, 0x80, 0x3f, 0xb6, 0xaa } \
+  }
+
+#define EFI_REDFISH_DISCOVER_TCP6_INSTANCE_GUID \
+  { \
+    0xbe513b6d, 0x41c1, 0x96Ed, { 0x8d, 0xaf, 0x3e, 0x89, 0xc5, 0xf5, 0x02, 0x25 } \
+  }
+
+#define EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_GUID \
+  { \
+    0xc44a6076, 0xd42a, 0x4d54, { 0x85, 0x6d, 0x98, 0x8a, 0x85, 0x8f, 0xa1, 0x11 } \
+  }
+
+extern EFI_COMPONENT_NAME_PROTOCOL   gRedfishDiscoverComponentName;
+extern EFI_COMPONENT_NAME2_PROTOCOL  gRedfishDiscoverComponentName2;
+extern EFI_UNICODE_STRING_TABLE      *gRedfishDiscoverControllerNameTable;
+
+//
+// Enumeration of network protocols
+// required for the Redfish service discovery.
+//
+typedef enum {
+  ProtocolTypeTcp4 = 0, ///< Network protocol TCPv4.
+  ProtocolTypeTcp6,     ///< Network protocol TCCv6.
+  ProtocolTypeRestEx,   ///< REST EX over network protocol.
+  MaxProtocolType
+} NETWORK_INTERFACE_PROTOCOL_TYPE;
+
+//
+// Network protocol information installed on
+// the network interface.
+//
+typedef struct {
+  EFI_GUID ProtocolGuid;                ///< Network protocol GUID.
+  EFI_GUID ProtocolServiceGuid;         ///< Network protocol service GUID.
+  UINT32   ProtocolDiscoverId;          ///< The identifier installed on network protocol handle.
+  EFI_HANDLE ProtocolControllerHandle;  ///< The controller handle on network protocol.
+  VOID *NetworkProtocolInterface;       ///< The protocol interface of network protocol.
+} REDFISH_DISCOVER_NETWORK_INTERFACE_PROTOCOL;
+
+//
+// Internal structure used to maintain network
+// interface properties.
+//
+typedef struct {
+  LIST_ENTRY      Entry;                        ///< Link list entry.
+  EFI_HANDLE      OpenDriverAgentHandle;        ///< The agent to open network protocol.
+  EFI_HANDLE      OpenDriverControllerHandle;   ///< The controller handle to open network protocol.
+  UINTN           HwAddressSize;                ///< The size of network interface hardware address.
+  EFI_MAC_ADDRESS MacAddress;                   ///< MAC address of network interface.
+  CHAR16          *StrMacAddr;                  ///< String to MAC address of network interface.
+  BOOLEAN         GotSubnetInfo;                ///< Indicates sub net information is retrieved.
+  EFI_IP_ADDRESS  SubnetAddr;                   ///< Subnet ID.
+  EFI_IP_ADDRESS  SubnetMask;                   ///< Subnet mask (IPv4 only)
+  UINT8           SubnetPrefixLength;           ///< Subnet prefix.
+  UINT16          VlanId;                       ///< VLAN ID
+  UINT32          SubnetAddrInfoIPv6Number;     ///< IPv6 address info number.
+  EFI_IP6_ADDRESS_INFO *SubnetAddrInfoIPv6;     ///< IPv6 address info.
+  //
+  // Network interface protocol and REST EX infor.
+  //
+  UINT32          NetworkProtocolType;          ///< Network protocol type. Refer to
+                                                ///< NETWORK_INTERFACE_PROTOCOL_TYPE.
+  REDFISH_DISCOVER_NETWORK_INTERFACE_PROTOCOL NetworkInterfaceProtocolInfo; ///< Network interface protocol information.
+  EFI_HANDLE      RestExHandle;                 ///< REST EX handle associated with this network interface.
+} EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL;
+
+//
+// Internal structure used to maintain REST EX properties.
+//
+typedef struct {
+    LIST_ENTRY      Entry;                          ///< Link list entry.
+    EFI_HANDLE      OpenDriverAgentHandle;          ///< The agent to open network protocol.
+    EFI_HANDLE      OpenDriverControllerHandle;     ///< The controller handle to open network protocol.
+    EFI_HANDLE      RestExChildHandle;              ///< The child handle created throught REST EX Service Protocol.
+    EFI_HANDLE      RestExControllerHandle;         ///< The controller handle which provide REST EX protocol.
+    EFI_REST_EX_PROTOCOL *RestExProtocolInterface;  ///< Pointer to EFI_REST_EX_PROTOCOL.
+    UINT32          RestExId;                       ///< The identifier installed on REST EX controller handle.
+} EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL;
+
+/**
+  This function to get subnet information.
+
+  @param[in]            ImageHandle  EFI handle with this image.
+  @param[in]            Instance  Instance of Network interface.
+  @retval EFI_STATUS    Get subnet information successfully.
+  @retval Otherwise     Fail to get subnet information.
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_REDFISH_DISCOVER_GET_SUBNET_INFO)(
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance
+);
+
+//
+// The require network protocol matrix.
+//
+typedef struct {
+  UINT32   ProtocolType;                                ///< Network protocol type,
+                                                        ///< Refer to NETWORK_INTERFACE_PROTOCOL_TYPE.
+  CHAR16   *ProtocolName;                               ///< Protocol name.
+  EFI_GUID *RequiredProtocolGuid;                       ///< Network protocol interface GUID.
+  EFI_GUID *RequiredServiceBindingProtocolGuid;         ///< Network protocol service GUID.
+  EFI_GUID *DiscoveredProtocolGuid;                     ///< Protocol interface GUID use to install identifier.
+  EFI_REDFISH_DISCOVER_GET_SUBNET_INFO GetSubnetInfo;   ///< Function of getting subnet information.
+} REDFISH_DISCOVER_REQUIRED_PROTOCOL;
+
+//
+// Link list of Redfish discover instance.
+//
+typedef struct {
+  LIST_ENTRY  NextInstance;                             ///< Next list.
+  EFI_REDFISH_DISCOVERED_INSTANCE *Instance;            ///< Pointer to EFI_REDFISH_DISCOVERED_INSTANCE.
+} EFI_REDFISH_DISCOVERED_INTERNAL_LIST;
+
+//
+// Internal structure of Redfish discover instance.
+//
+typedef struct {
+  LIST_ENTRY  Entry;                                    ///< Link list entry.
+  EFI_HANDLE  Owner;                                    ///< The owner owns this Redfish service discovery.
+                                                        ///< It's the EFI image handle of driver uses
+                                                        ///< EFI Redfish Discover Protocol.
+  EFI_REDFISH_DISCOVER_FLAG DiscoverFlags;              ///< EFI_REDFISH_DISCOVER_FLAG
+  EFI_REDFISH_DISCOVERED_TOKEN *DiscoverToken;          ///< Token used to signal when Redfish service is discovered.
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *NetworkInterface; ///< EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL
+                                                                     ///< instance used to discover Redfish service.
+  //
+  // Below for Host insterface discovery.
+  //
+  BOOLEAN         HostIntfValidation;                   ///< Indicates whether to validate Redfish Host interface.
+  EFI_IP_ADDRESS  TargetIpAddress;                      ///< Target IP address reported in Redfish Host interface.
+} EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE;
+
+/**
+  The function adds a new foudn Redfish service to internal list and
+  notify clinet.
+
+  It simply frees the packet.
+
+  @param[in]  Instance              EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE.
+  @param[in]  RedfishVersion        Redfish version.
+  @param[in]  RedfishLocation       Redfish location.
+  @param[in]  Uuid                  Service UUID string.
+  @param[in]  Os                    OS string.
+  @param[in]  OsVer                 OS version string.
+  @param[in]  Product               Product string.
+  @param[in]  ProductVer            Product verison string.
+  @param[in]  UseHttps              Redfish service requires secured connection.
+  @retval EFI_SUCCESS               Redfish service is added to list successfully.
+
+**/
+EFI_STATUS
+AddAndSignalNewRedfishService (
+  IN EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *Instance,
+  IN UINTN *RedfishVersion OPTIONAL,
+  IN CHAR8 *RedfishLocation OPTIONAL,
+  IN CHAR8 *Uuid  OPTIONAL,
+  IN CHAR8 *Os  OPTIONAL,
+  IN CHAR8 *OsVer  OPTIONAL,
+  IN CHAR8 *Product  OPTIONAL,
+  IN CHAR8 *ProductVer  OPTIONAL,
+  IN BOOLEAN UseHttps
+  );
+
+/**
+  The function gets information reported in Redfish Host Interface.
+
+  It simply frees the packet.
+
+  @param[in]  Smbios           SMBIOS protocol.
+  @param[out] DeviceDescriptor Pointer to REDFISH_INTERFACE_DATA.
+  @param[out] ProtocolData     Pointer to REDFISH_OVER_IP_PROTOCOL_DATA.
+
+  @retval EFI_SUCCESS    Get host interface succesfully.
+  @retval Otherwise      Fail to tet host interface.
+
+**/
+EFI_STATUS
+RedfishGetHostInterfaceProtocolData (
+  IN EFI_SMBIOS_PROTOCOL              *Smbios,
+  OUT REDFISH_INTERFACE_DATA          **DeviceDescriptor,
+  OUT REDFISH_OVER_IP_PROTOCOL_DATA   **ProtocolData
+  );
+
+extern EFI_GUID gRedfishDiscoverTcp4Instance;
+extern EFI_GUID gRedfishDiscoverTcp6Instance;
+extern EFI_GUID gRedfishDiscoverRestEXInstance;
+#endif
diff --git a/RedfishPkg/RedfishDiscoverDxe/ComponentName.c b/RedfishPkg/RedfishDiscoverDxe/ComponentName.c
new file mode 100644
index 0000000000..adad2504bc
--- /dev/null
+++ b/RedfishPkg/RedfishDiscoverDxe/ComponentName.c
@@ -0,0 +1,218 @@
+/** @file
+  Implementation of EFI_COMPONENT_NAME_PROTOCOL and EFI_COMPONENT_NAME2_PROTOCOL protocol.
+  for EFI Refish Discover Protocol
+
+  (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "RedfishDiscoverInternal.h"
+
+//
+// EFI Component Name Functions
+//
+/**
+  Retrieves a Unicode string that is the user-readable name of the EFI Driver.
+
+  @param[in]  This       A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
+  @param[in]  Language   A pointer to a three-character ISO 639-2 language identifier.
+                         This is the language of the driver name that that the caller
+                         is requesting, and it must match one of the languages specified
+                         in SupportedLanguages.  The number of languages supported by a
+                         driver is up to the driver writer.
+  @param[out] DriverName A pointer to the Unicode string to return.  This Unicode string
+                         is the name of the driver specified by This in the language
+                         specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by This
+                                and the language specified by Language was returned
+                                in DriverName.
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+  @retval EFI_INVALID_PARAMETER DriverName is NULL.
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support the
+                                language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverComponentNameGetDriverName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  CHAR8                        *Language,
+  OUT CHAR16                       **DriverName
+  );
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by an EFI Driver.
+
+  @param[in]  This             A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
+  @param[in]  ControllerHandle The handle of a controller that the driver specified by
+                               This is managing.  This handle specifies the controller
+                               whose name is to be returned.
+  @param[in]  ChildHandle      The handle of the child controller to retrieve the name
+                               of.  This is an optional parameter that may be NULL.  It
+                               will be NULL for device drivers.  It will also be NULL
+                               for a bus drivers that wish to retrieve the name of the
+                               bus controller.  It will not be NULL for a bus driver
+                               that wishes to retrieve the name of a child controller.
+  @param[in]  Language         A pointer to a three character ISO 639-2 language
+                               identifier.  This is the language of the controller name
+                               that the caller is requesting, and it must match one
+                               of the languages specified in SupportedLanguages.  The
+                               number of languages supported by a driver is up to the
+                               driver writer.
+  @param[out]  ControllerName  A pointer to the Unicode string to return.  This Unicode
+                               string is the name of the controller specified by
+                               ControllerHandle and ChildHandle in the language specified
+                               by Language, from the point of view of the driver specified
+                               by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user-readable name in the
+                                language specified by Language for the driver
+                                specified by This was returned in DriverName.
+  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
+  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid EFI_HANDLE.
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+  @retval EFI_INVALID_PARAMETER ControllerName is NULL.
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently managing
+                                the controller specified by ControllerHandle and
+                                ChildHandle.
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support the
+                                language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverComponentNameGetControllerName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  EFI_HANDLE                    ControllerHandle,
+  IN  EFI_HANDLE                    ChildHandle        OPTIONAL,
+  IN  CHAR8                         *Language,
+  OUT CHAR16                        **ControllerName
+  );
+
+
+///
+/// Component Name Protocol instance
+///
+GLOBAL_REMOVE_IF_UNREFERENCED
+EFI_COMPONENT_NAME_PROTOCOL  gRedfishDiscoverComponentName = {
+  RedfishDiscoverComponentNameGetDriverName,
+  RedfishDiscoverComponentNameGetControllerName,
+  "eng"
+};
+
+///
+/// Component Name 2 Protocol instance
+///
+GLOBAL_REMOVE_IF_UNREFERENCED
+EFI_COMPONENT_NAME2_PROTOCOL  gRedfishDiscoverComponentName2 = {
+  (EFI_COMPONENT_NAME2_GET_DRIVER_NAME)     RedfishDiscoverComponentNameGetDriverName,
+  (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) RedfishDiscoverComponentNameGetControllerName,
+  "en"
+};
+
+///
+/// Table of driver names
+///
+GLOBAL_REMOVE_IF_UNREFERENCED
+EFI_UNICODE_STRING_TABLE mRedfishDiscoverDriverNameTable[] = {
+  { "eng;en", (CHAR16 *)L"Redfish Discover UEFI Driver" },
+  { NULL, NULL }
+};
+
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE *gRedfishDiscoverControllerNameTable = NULL;
+
+/**
+  Retrieves a Unicode string that is the user-readable name of the EFI Driver.
+
+  @param[in]  This        A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
+  @param[in]  Language    A pointer to a three-character ISO 639-2 language identifier.
+                          This is the language of the driver name that that the caller
+                          is requesting, and it must match one of the languages specified
+                          in SupportedLanguages.  The number of languages supported by a
+                          driver is up to the driver writer.
+  @param[out]  DriverName A pointer to the Unicode string to return.  This Unicode string
+                          is the name of the driver specified by This in the language
+                          specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by This
+                                and the language specified by Language was returned
+                                in DriverName.
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+  @retval EFI_INVALID_PARAMETER DriverName is NULL.
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support the
+                                language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverComponentNameGetDriverName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  CHAR8                        *Language,
+  OUT CHAR16                       **DriverName
+  )
+{
+  return LookupUnicodeString2 (
+           Language,
+           This->SupportedLanguages,
+           mRedfishDiscoverDriverNameTable,
+           DriverName,
+           (BOOLEAN)(This == &gRedfishDiscoverComponentName)
+           );
+}
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by an EFI Driver.
+
+  @param[in]  This             A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
+  @param[in]  ControllerHandle The handle of a controller that the driver specified by
+                               This is managing.  This handle specifies the controller
+                               whose name is to be returned.
+  @param[in]  ChildHandle      The handle of the child controller to retrieve the name
+                               of.  This is an optional parameter that may be NULL.  It
+                               will be NULL for device drivers.  It will also be NULL
+                               for a bus drivers that wish to retrieve the name of the
+                               bus controller.  It will not be NULL for a bus driver
+                               that wishes to retrieve the name of a child controller.
+  @param[in]  Language         A pointer to a three character ISO 639-2 language
+                               identifier.  This is the language of the controller name
+                               that the caller is requesting, and it must match one
+                               of the languages specified in SupportedLanguages.  The
+                               number of languages supported by a driver is up to the
+                              driver writer.
+  @param[out]  ControllerName  A pointer to the Unicode string to return.  This Unicode
+                               string is the name of the controller specified by
+                               ControllerHandle and ChildHandle in the language specified
+                               by Language, from the point of view of the driver specified
+                               by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user-readable name in the
+                                language specified by Language for the driver
+                                specified by This was returned in DriverName.
+  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
+  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid EFI_HANDLE.
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+  @retval EFI_INVALID_PARAMETER ControllerName is NULL.
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently managing
+                                the controller specified by ControllerHandle and
+                                ChildHandle.
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support the
+                                language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverComponentNameGetControllerName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  EFI_HANDLE                    ControllerHandle,
+  IN  EFI_HANDLE                    ChildHandle        OPTIONAL,
+  IN  CHAR8                         *Language,
+  OUT CHAR16                        **ControllerName
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.c b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.c
new file mode 100644
index 0000000000..80d70a4679
--- /dev/null
+++ b/RedfishPkg/RedfishDiscoverDxe/RedfishDiscoverDxe.c
@@ -0,0 +1,1910 @@
+/** @file
+
+  The implementation of EFI Redfidh Discover Protocol.
+
+  (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "RedfishDiscoverInternal.h"
+
+LIST_ENTRY mRedfishDiscoverList;
+LIST_ENTRY mRedfishInstanceList;
+EFI_SMBIOS_PROTOCOL *mSmbios = NULL;
+
+UINTN mNumNetworkInterface = 0;
+UINTN mNumRestExInstance = 0;
+LIST_ENTRY mEfiRedfishDiscoverNetworkInterface;
+LIST_ENTRY mEfiRedfishDiscoverRestExInstance;
+
+EFI_GUID mRedfishDiscoverTcp4InstanceGuid = EFI_REDFISH_DISCOVER_TCP4_INSTANCE_GUID;
+EFI_GUID mRedfishDiscoverTcp6InstanceGuid = EFI_REDFISH_DISCOVER_TCP6_INSTANCE_GUID;
+EFI_GUID mRedfishDiscoverRestExInstanceGuid = EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_GUID;
+
+EFI_HANDLE EfiRedfishDiscoverProtocolHandle = NULL;
+
+EFI_STATUS
+EFIAPI
+Tcp4GetSubnetInfo (
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance
+);
+
+EFI_STATUS
+EFIAPI
+Tcp6GetSubnetInfo (
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance
+);
+
+static REDFISH_DISCOVER_REQUIRED_PROTOCOL gRequiredProtocol[] = {
+  {
+    ProtocolTypeTcp4,
+    L"TCP4 Service Binding Protocol",
+    &gEfiTcp4ProtocolGuid,
+    &gEfiTcp4ServiceBindingProtocolGuid,
+    &mRedfishDiscoverTcp4InstanceGuid,
+    Tcp4GetSubnetInfo
+  },
+  {
+    ProtocolTypeTcp6,
+    L"TCP6 Service Binding Protocol",
+    &gEfiTcp6ProtocolGuid,
+    &gEfiTcp6ServiceBindingProtocolGuid,
+    &mRedfishDiscoverTcp6InstanceGuid,
+    Tcp6GetSubnetInfo
+  },
+  {
+    ProtocolTypeRestEx,
+    L"REST EX Service Binding Protocol",
+    &gEfiRestExProtocolGuid,
+    &gEfiRestExServiceBindingProtocolGuid,
+    &mRedfishDiscoverRestExInstanceGuid,
+    NULL
+  }
+};
+
+/**
+  This function creates REST EX instance for the found Resfish service.
+  by known owner handle.
+
+  @param[in]    Instance        EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE
+  @param[in]    Token           Client token.
+
+  @retval NULL  Instance not found.
+  @retval EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE The instance owned by this owner.
+
+**/
+EFI_STATUS
+CreateRestExInstance (
+  IN EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *Instance,
+  IN EFI_REDFISH_DISCOVERED_TOKEN *Token
+  )
+{
+  EFI_STATUS Status;
+
+  Status = RestExLibCreateChild (
+            Instance->Owner,
+            FixedPcdGetBool (PcdRedfishDiscoverAccessModeInBand)? EfiRestExServiceInBandAccess: EfiRestExServiceOutOfBandAccess,
+            EfiRestExConfigHttp,
+            EfiRestExServiceRedfish,
+            &Token->DiscoverList.RedfishInstances->Information.RedfishRestExHandle
+            );
+  return Status;
+}
+
+/**
+  This function gets EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE
+  by known owner handle.
+
+  @param[in]    ImageHandle             Image handle owns EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE.
+  @param[in]    TargetNetworkInterface  Target network interface used by this EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE.
+  @param[in]    DiscoverFlags           EFI_REDFISH_DISCOVER_FLAG
+
+  @retval NULL  Instance not found.
+  @retval EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE The instance owned by this owner.
+
+**/
+EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *
+GetInstanceByOwner (
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *TargetNetworkInterface,
+  IN EFI_REDFISH_DISCOVER_FLAG DiscoverFlags
+  )
+{
+  EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *ThisInstance;
+
+  if (IsListEmpty (&mRedfishDiscoverList)) {
+    return NULL;
+  }
+  ThisInstance =
+    (EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *)GetFirstNode (&mRedfishDiscoverList);
+  while (TRUE) {
+    if ((ThisInstance->Owner == ImageHandle) &&
+         (ThisInstance->DiscoverFlags == DiscoverFlags) &&
+         (ThisInstance->NetworkInterface == TargetNetworkInterface)) {
+      return ThisInstance;
+    }
+    if (IsNodeAtEnd (&mRedfishDiscoverList, &ThisInstance->Entry)) {
+      break;
+    }
+    ThisInstance =
+      (EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *)GetNextNode (&mRedfishDiscoverList, &ThisInstance->Entry);
+  };
+  return NULL;
+}
+
+/**
+  This function gets the subnet information of this TCP4 instance.
+
+  @param[in]            ImageHandle  EFI handle with this image.
+  @param[in]            Instance  Instance of Network interface.
+  @retval EFI_STATUS    Get subnet information successfully.
+  @retval Otherwise     Fail to get subnet information.
+**/
+EFI_STATUS
+EFIAPI
+Tcp4GetSubnetInfo (
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance
+)
+{
+  EFI_STATUS Status;
+  EFI_TCP4_PROTOCOL *Tcp4;
+  EFI_TCP4_CONFIG_DATA Tcp4CfgData;
+  EFI_TCP4_OPTION Tcp4Option;
+  EFI_IP4_MODE_DATA IpModedata;
+  UINT8 SubnetMaskIndex;
+  UINT8 BitMask;
+  UINT8 PrefixLength;
+  BOOLEAN GotPrefixLength;
+
+  if (Instance == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+  Tcp4 = (EFI_TCP4_PROTOCOL *)Instance->NetworkInterfaceProtocolInfo.NetworkProtocolInterface;
+
+  ZeroMem ((VOID *)&Tcp4CfgData, sizeof (EFI_TCP4_CONFIG_DATA));
+  ZeroMem ((VOID *)&Tcp4Option, sizeof (EFI_TCP4_OPTION));
+  // Give a local host IP address just for getting subnet information.
+  Tcp4CfgData.AccessPoint.UseDefaultAddress = TRUE;
+  Tcp4CfgData.AccessPoint.RemoteAddress.Addr [0] = 127;
+  Tcp4CfgData.AccessPoint.RemoteAddress.Addr [1] = 0;
+  Tcp4CfgData.AccessPoint.RemoteAddress.Addr [2] = 0;
+  Tcp4CfgData.AccessPoint.RemoteAddress.Addr [3] = 1;
+  Tcp4CfgData.AccessPoint.RemotePort  = 80;
+  Tcp4CfgData.AccessPoint.ActiveFlag  = TRUE;
+
+  Tcp4CfgData.ControlOption = &Tcp4Option;
+  Tcp4Option.ReceiveBufferSize      = 65535;
+  Tcp4Option.SendBufferSize         = 65535;
+  Tcp4Option.MaxSynBackLog          = 5;
+  Tcp4Option.ConnectionTimeout      = 60;
+  Tcp4Option.DataRetries            = 12;
+  Tcp4Option.FinTimeout             = 2;
+  Tcp4Option.KeepAliveProbes        = 6;
+  Tcp4Option.KeepAliveTime          = 7200;
+  Tcp4Option.KeepAliveInterval      = 30;
+  Tcp4Option.EnableNagle            = TRUE;
+  Status = Tcp4->Configure (Tcp4, &Tcp4CfgData);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: Can't get subnet information\n", __FUNCTION__));
+    return Status;
+  }
+  Status = Tcp4->GetModeData (Tcp4, NULL, NULL, &IpModedata, NULL, NULL);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: Can't get IP mode data information\n", __FUNCTION__));
+    return Status;
+  }
+  IP4_COPY_ADDRESS (&Instance->SubnetMask, &IpModedata.ConfigData.SubnetMask);
+  Instance->SubnetAddr.v4.Addr [0] = IpModedata.ConfigData.StationAddress.Addr [0] & Instance->SubnetMask.v4.Addr [0];
+  Instance->SubnetAddr.v4.Addr [1] = IpModedata.ConfigData.StationAddress.Addr [1] & Instance->SubnetMask.v4.Addr [1];
+  Instance->SubnetAddr.v4.Addr [2] = IpModedata.ConfigData.StationAddress.Addr [2] & Instance->SubnetMask.v4.Addr [2];
+  Instance->SubnetAddr.v4.Addr [3] = IpModedata.ConfigData.StationAddress.Addr [3] & Instance->SubnetMask.v4.Addr [3];
+  //
+  // Calculate the subnet mask prefix.
+  //
+  GotPrefixLength = FALSE;
+  PrefixLength = 0;
+  SubnetMaskIndex = 0;
+  while (GotPrefixLength == FALSE && SubnetMaskIndex < 4) {
+    BitMask = 0x80;
+    while (BitMask != 0) {
+      if ((Instance->SubnetMask.v4.Addr [SubnetMaskIndex] & BitMask) != 0) {
+        PrefixLength ++;
+      } else {
+        GotPrefixLength = TRUE;
+        break;
+      }
+      BitMask = BitMask >> 1;
+    };
+    SubnetMaskIndex ++;
+  };
+  Instance->SubnetPrefixLength = PrefixLength;
+  return EFI_SUCCESS;
+}
+
+/**
+  This function gets the subnet information of this TCP6 instance.
+
+  @param[in]            ImageHandle  EFI handle with this image.
+  @param[in]            Instance  Instance of Network interface.
+  @retval EFI_STATUS    Get subnet information successfully.
+  @retval Otherwise     Fail to get subnet information.
+**/
+EFI_STATUS
+EFIAPI
+Tcp6GetSubnetInfo (
+  IN EFI_HANDLE ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance
+)
+{
+  EFI_STATUS Status;
+  EFI_TCP6_PROTOCOL *Tcp6;
+  EFI_IP6_MODE_DATA IpModedata;
+
+  if (Instance == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+  Tcp6 = (EFI_TCP6_PROTOCOL *)Instance->NetworkInterfaceProtocolInfo.NetworkProtocolInterface;
+
+  Status = Tcp6->GetModeData (Tcp6, NULL, NULL, &IpModedata, NULL, NULL);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: Can't get IP mode data information\n"));
+    return Status;
+  }
+  if (IpModedata.AddressCount == 0) {
+    DEBUG ((DEBUG_INFO, "%a: No IPv6 address configured.\n"));
+  }
+  if (Instance->SubnetAddrInfoIPv6 != NULL) {
+    FreePool (Instance->SubnetAddrInfoIPv6);
+  }
+  Instance->SubnetAddrInfoIPv6 = AllocateZeroPool (IpModedata.AddressCount * sizeof (EFI_IP6_ADDRESS_INFO));
+  if (Instance->SubnetAddrInfoIPv6 == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Failed to allocate memory fir IPv6 subnet address information\n"));
+    return EFI_OUT_OF_RESOURCES;
+  }
+  Instance->SubnetAddrInfoIPv6Number = IpModedata.AddressCount;
+  CopyMem (
+    (VOID *)Instance->SubnetAddrInfoIPv6,
+    (VOID *)&IpModedata.AddressList,
+    IpModedata.AddressCount * sizeof (EFI_IP6_ADDRESS_INFO)
+    );
+  FreePool (IpModedata.AddressList);
+  return EFI_SUCCESS;
+}
+
+/**
+  This function searches EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL
+  instance with the given  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE.
+
+  @param[in] TargetNetworkInterface  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE.
+                                     NULL for all EFI_REDFISH_DISCOVER_NETWORK_INTERFACEs.
+
+  @retval Non-NULL  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL is returned.
+  @retval NULL      Non of EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL instance is returned.
+**/
+EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *
+GetTargetNetworkInterfaceInternal (
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE  *TargetNetworkInterface
+  )
+{
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+
+  ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+  while (TRUE) {
+    if (CompareMem((VOID *)&ThisNetworkInterface->MacAddress, &TargetNetworkInterface->MacAddress, ThisNetworkInterface->HwAddressSize) == 0) {
+      return ThisNetworkInterface;
+    }
+    if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry)) {
+      return NULL;
+    }
+    ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry);
+  };
+  return NULL;
+}
+
+/**
+  This function validate if target network interface is ready for discovering
+  Redfish service.
+
+  @param[in] TargetNetworkInterface  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE.
+                                     NULL for all EFI_REDFISH_DISCOVER_NETWORK_INTERFACEs.
+  @param[in] Flags                   EFI_REDFISH_DISCOVER_FLAG
+
+  @retval EFI_SUCCESS     Target network interface is ready to use.
+  @retval EFI_UNSUPPORTED Target network interface is not ready to use.
+**/
+EFI_STATUS
+ValidateTargetNetworkInterface (
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE  *TargetNetworkInterface,
+  IN EFI_REDFISH_DISCOVER_FLAG Flags
+  )
+{
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+
+  if (IsListEmpty (&mEfiRedfishDiscoverNetworkInterface) && TargetNetworkInterface == NULL) {
+    return EFI_UNSUPPORTED;
+  }
+  if (TargetNetworkInterface == NULL) {
+    return EFI_SUCCESS; // Return EFI_SUCCESS if no network interface is specified.
+  }
+
+  ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode(&mEfiRedfishDiscoverNetworkInterface);
+  while (TRUE) {
+    if (CompareMem((VOID *)&ThisNetworkInterface->MacAddress, &TargetNetworkInterface->MacAddress, ThisNetworkInterface->HwAddressSize) == 0) {
+      break;
+    }
+    if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry)) {
+      return EFI_UNSUPPORTED;
+    }
+    ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry);
+  };
+  if ((Flags & EFI_REDFISH_DISCOVER_SSDP) != 0) {
+    // Validate if UDP4/6 is supported on the given network interface.
+    // SSDP is not supported.
+
+    return EFI_SUCCESS;
+  }
+  if (ThisNetworkInterface->NetworkInterfaceProtocolInfo.ProtocolControllerHandle == NULL) {
+    return EFI_UNSUPPORTED; // The required protocol on this network interface is not found.
+  }
+  return EFI_SUCCESS;
+}
+/**
+  This function returns number of network interface instance.
+
+  @retval UINTN  Number of network interface instances.
+**/
+UINTN
+NumberOfNetworkInterface (VOID)
+{
+  UINTN Num;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+
+  if (IsListEmpty (&mEfiRedfishDiscoverNetworkInterface)) {
+    return 0;
+  }
+
+  Num = 1;
+  ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+  while (TRUE) {
+    if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry)) {
+      break;
+    }
+    ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry);
+    Num ++;
+  };
+  return Num;
+}
+
+/**
+  This function checks the  IP version supported on this
+  netwoek interface.
+
+  @param[in]    ThisNetworkInterface   EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL
+
+  @retval TRUE  Is IPv6, otherwise IPv4.
+
+**/
+BOOLEAN
+CheckIsIpVersion6 (
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface
+)
+{
+  if (ThisNetworkInterface->NetworkProtocolType == ProtocolTypeTcp6) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/**
+  This function discover Redfish service through SMBIOS host interface.
+
+  @param[in]    Instance     EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE
+
+  @retval EFI_SUCCESS        Redfish service is discovered through SMBIOS Host interface.
+  @retval Others             Fail to discover Redfish service throught SMBIOS host interface
+
+**/
+EFI_STATUS
+DiscoverRedfishHostInterface (IN EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *Instance)
+{
+  EFI_STATUS Status;
+  REDFISH_OVER_IP_PROTOCOL_DATA *Data;
+  REDFISH_INTERFACE_DATA  *DeviceDescriptor;
+  CHAR8 UuidStr[sizeof"00000000-0000-0000-0000-000000000000" + 1];
+  CHAR16 Ipv6Str [sizeof"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" + 1];
+  CHAR8 RedfishServiceLocateStr [sizeof"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" + 1];
+  UINTN StrSize;
+  UINTN MacCompareStstus;
+  BOOLEAN IsHttps;
+
+  Data = NULL;
+  DeviceDescriptor = NULL;
+
+  if (mSmbios == NULL) {
+    Status = gBS->LocateProtocol(&gEfiSmbiosProtocolGuid, NULL, (VOID **)&mSmbios);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+  Status = RedfishGetHostInterfaceProtocolData (mSmbios, &DeviceDescriptor, &Data); // Search for SMBIOS type 42h
+  if (!EFI_ERROR (Status) && Data != NULL && DeviceDescriptor != NULL) {
+    //
+    // Chceck if we can reach out Redfish service using this network interface.
+    // Check with MAC address using Device Descroptor Data Device Type 04 and Type 05.
+    // Those two types of Redfish host interface device has MAC information.
+    //
+    if (DeviceDescriptor->DeviceType == REDFISH_HOST_INTERFACE_DEVICE_TYPE_PCI_PCIE_V2) {
+      MacCompareStstus = CompareMem(&Instance->NetworkInterface->MacAddress, &DeviceDescriptor->DeviceDescriptor.PciPcieDeviceV2.MacAddress, 6);
+    } else if (DeviceDescriptor->DeviceType == REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2){
+      MacCompareStstus = CompareMem(&Instance->NetworkInterface->MacAddress, &DeviceDescriptor->DeviceDescriptor.UsbDeviceV2.MacAddress, 6);
+    } else {
+      return EFI_UNSUPPORTED;
+    }
+    if (MacCompareStstus != 0) {
+      return EFI_UNSUPPORTED;
+    }
+
+    if (Data->RedfishServiceIpAddressFormat == 1) {
+      IP4_COPY_ADDRESS ((VOID *)&Instance->TargetIpAddress.v4, (VOID *)Data->RedfishServiceIpAddress);
+    } else {
+      IP6_COPY_ADDRESS ((VOID *)&Instance->TargetIpAddress.v6, (VOID *)Data->RedfishServiceIpAddress);
+    }
+
+    if (Instance->HostIntfValidation) {
+      DEBUG ((DEBUG_ERROR,"%a:Send UPnP unicast SSDP to validate this Redfish Host Interface is not supported.\n", __FUNCTION__));
+      Status = EFI_UNSUPPORTED;
+    } else {
+      //
+      // Add this istance to list without detial information of Redfish
+      // service.
+      //
+      IsHttps = FALSE;
+      if (Data->RedfishServiceIpPort == 443) {
+        IsHttps = TRUE;
+      }
+      StrSize = sizeof(UuidStr);
+      AsciiSPrint(UuidStr, StrSize, "%g", &Data->ServiceUuid);
+      //
+      // Generate Redfish service location string.
+      //
+      if (Data->RedfishServiceIpAddressFormat == REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP6) {
+        NetLibIp6ToStr((IPv6_ADDRESS *)&Data->RedfishServiceIpAddress, Ipv6Str, sizeof (Ipv6Str));
+        if (Data->RedfishServiceIpPort == 0 || IsHttps == TRUE) {
+            AsciiSPrintUnicodeFormat (
+              RedfishServiceLocateStr,
+              sizeof (RedfishServiceLocateStr),
+              L"%s",
+              Ipv6Str
+            );
+        } else {
+            AsciiSPrintUnicodeFormat(
+              RedfishServiceLocateStr,
+              sizeof (RedfishServiceLocateStr),
+              L"[%s]:%d",
+              Ipv6Str,
+              Data->RedfishServiceIpPort
+            );
+        }
+      } else {
+        if (Data->RedfishServiceIpPort == 0 || IsHttps == TRUE) {
+          AsciiSPrint(
+            RedfishServiceLocateStr,
+            sizeof (RedfishServiceLocateStr),
+            "%d.%d.%d.%d",
+            Data->RedfishServiceIpAddress [0],
+            Data->RedfishServiceIpAddress [1],
+            Data->RedfishServiceIpAddress [2],
+            Data->RedfishServiceIpAddress [3]
+            );
+        } else {
+          AsciiSPrint(
+            RedfishServiceLocateStr,
+            sizeof (RedfishServiceLocateStr),
+            "%d.%d.%d.%d:%d",
+            Data->RedfishServiceIpAddress [0],
+            Data->RedfishServiceIpAddress [1],
+            Data->RedfishServiceIpAddress [2],
+            Data->RedfishServiceIpAddress [3],
+            Data->RedfishServiceIpPort
+            );
+        }
+       }
+      Status = AddAndSignalNewRedfishService (
+            Instance,
+            NULL,
+            RedfishServiceLocateStr,
+            UuidStr,
+            NULL,
+            NULL,
+            NULL,
+            NULL,
+            IsHttps
+            );
+    }
+  }
+  return Status;
+}
+
+/**
+  The function adds a new found Redfish service to internal list and
+  notify client.
+
+  @param[in]  Instance              EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE.
+  @param[in]  RedfishVersion        Redfish version.
+  @param[in]  RedfishLocation       Redfish location.
+  @param[in]  Uuid                  Service UUID string.
+  @param[in]  Os                    OS string.
+  @param[in]  OsVer                 OS version string.
+  @param[in]  Product               Product string.
+  @param[in]  ProductVer            Product verison string.
+  @param[in]  UseHttps              Redfish service requires secured connection.
+  @retval EFI_SUCCESS               Redfish service is added to list successfully.
+
+**/
+EFI_STATUS
+AddAndSignalNewRedfishService (
+  IN EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *Instance,
+  IN UINTN *RedfishVersion OPTIONAL,
+  IN CHAR8 *RedfishLocation OPTIONAL,
+  IN CHAR8 *Uuid  OPTIONAL,
+  IN CHAR8 *Os  OPTIONAL,
+  IN CHAR8 *OsVer  OPTIONAL,
+  IN CHAR8 *Product  OPTIONAL,
+  IN CHAR8 *ProductVer  OPTIONAL,
+  IN BOOLEAN UseHttps
+  )
+{
+  BOOLEAN NewFound;
+  BOOLEAN InfoRefresh;
+  BOOLEAN RestExOpened;
+  BOOLEAN DeleteRestEx;
+  EFI_STATUS Status;
+  EFI_REDFISH_DISCOVERED_INTERNAL_LIST *DiscoveredList;
+  EFI_REDFISH_DISCOVERED_INSTANCE *DiscoveredInstance;
+  CHAR16 *Char16Uuid;
+  EFI_REST_EX_PROTOCOL *RestEx;
+  EFI_REST_EX_HTTP_CONFIG_DATA *RestExHttpConfigData;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *NetworkInterface;
+
+  NewFound = TRUE;
+  InfoRefresh = FALSE;
+  Char16Uuid = NULL;
+  RestExOpened = FALSE;
+  DeleteRestEx = FALSE;
+
+  DEBUG ((DEBUG_INFO,"%a:Add this instance to Redfish instance list.\n", __FUNCTION__));
+
+  if (Uuid != NULL) {
+    Char16Uuid = (CHAR16 *)AllocateZeroPool(AsciiStrSize((const CHAR8 *)Uuid) * sizeof(CHAR16));
+    AsciiStrToUnicodeStrS ((const CHAR8 *)Uuid, Char16Uuid, AsciiStrSize((const CHAR8 *)Uuid) * sizeof(CHAR16));
+  }
+  DiscoveredList = NULL;
+  DiscoveredInstance = NULL;
+  RestExHttpConfigData = NULL;
+
+  NetworkInterface = Instance->NetworkInterface;
+  if (!IsListEmpty (&mRedfishInstanceList)) {
+    //
+    // Is this a duplicate redfish service.
+    //
+    DiscoveredList = (EFI_REDFISH_DISCOVERED_INTERNAL_LIST *)GetFirstNode (&mRedfishInstanceList);
+    NewFound = FALSE;
+    do {
+      if (Char16Uuid == NULL || DiscoveredList->Instance->Information.Uuid == NULL) {
+        //
+        // Check if this Redfish instance already found using IP addrress.
+        //
+        if (!CheckIsIpVersion6(NetworkInterface)) {
+          if (CompareMem ((VOID *)&Instance->TargetIpAddress.v4,
+                      (VOID *)&DiscoveredList->Instance->Information.RedfishHostIpAddress.v4,
+                      sizeof (EFI_IPv4_ADDRESS)
+                      ) == 0)
+          {
+            DiscoveredInstance = DiscoveredList->Instance;
+            if (DiscoveredList->Instance->Information.Uuid == NULL &&
+                Char16Uuid != NULL) {
+              InfoRefresh = TRUE;
+              DiscoveredInstance = DiscoveredList->Instance;
+              DEBUG((DEBUG_INFO,"*** This Redfish Service information refresh ***\n"));
+            }
+            break;
+          }
+        } else {
+          if (CompareMem ((VOID *)&Instance->TargetIpAddress.v6,
+                      (VOID *)&DiscoveredList->Instance->Information.RedfishHostIpAddress.v6,
+                      sizeof (EFI_IPv6_ADDRESS)
+                      ) == 0)
+          {
+            DiscoveredInstance = DiscoveredList->Instance;
+            break;
+          }
+        }
+      } else {
+        //
+        // Check if this Redfish instance already found using UUID.
+        //
+        if (StrCmp((const CHAR16 *)Char16Uuid, (const CHAR16 *)DiscoveredList->Instance->Information.Uuid) == 0) {
+          DiscoveredInstance = DiscoveredList->Instance;
+          break;
+        }
+      }
+      if (IsNodeAtEnd (&mRedfishInstanceList, &DiscoveredList->NextInstance)) {
+        NewFound = TRUE;
+        break;
+      }
+      DiscoveredList = (EFI_REDFISH_DISCOVERED_INTERNAL_LIST *)GetNextNode (&mRedfishInstanceList, &DiscoveredList->NextInstance);
+    } while (TRUE);
+  }
+  if (NewFound || InfoRefresh) {
+    if (!InfoRefresh) {
+      DiscoveredList = (EFI_REDFISH_DISCOVERED_INTERNAL_LIST *)AllocateZeroPool(sizeof(EFI_REDFISH_DISCOVERED_INTERNAL_LIST));
+      if (DiscoveredList == NULL) {
+        return EFI_OUT_OF_RESOURCES;
+      }
+      InitializeListHead (&DiscoveredList->NextInstance);
+      DiscoveredInstance = (EFI_REDFISH_DISCOVERED_INSTANCE *)AllocateZeroPool(sizeof(EFI_REDFISH_DISCOVERED_INSTANCE));
+      if (DiscoveredInstance == NULL) {
+        FreePool ((VOID *)DiscoveredList);
+        return EFI_OUT_OF_RESOURCES;
+      }
+    }
+    DEBUG ((DEBUG_INFO,"*** Redfish Service Information ***\n"));
+
+    DiscoveredInstance->Information.UseHttps = UseHttps;
+    if (RedfishVersion != NULL) {
+      DiscoveredInstance->Information.RedfishVersion = *RedfishVersion;
+      DEBUG ((DEBUG_INFO,"Redfish service version: %d.\n", DiscoveredInstance->Information.RedfishVersion));
+    }
+    if (RedfishLocation != NULL) {
+      DiscoveredInstance->Information.Location = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)RedfishLocation) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)RedfishLocation, DiscoveredInstance->Information.Location, AsciiStrSize((const CHAR8 *)RedfishLocation) * sizeof(CHAR16));
+      DEBUG ((DEBUG_INFO,"Redfish service location: %s.\n", DiscoveredInstance->Information.Location));
+    }
+    if (Uuid != NULL) {
+      DiscoveredInstance->Information.Uuid = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)Uuid) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)Uuid, DiscoveredInstance->Information.Uuid, AsciiStrSize((const CHAR8 *)Uuid) * sizeof(CHAR16));
+      DEBUG ((DEBUG_INFO,"Service UUID: %s.\n", DiscoveredInstance->Information.Uuid));
+    }
+    if (Os != NULL) {
+      DiscoveredInstance->Information.Os = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)Os) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)Os, DiscoveredInstance->Information.Os, AsciiStrSize((const CHAR8 *)Os) * sizeof(CHAR16));
+      DEBUG ((DEBUG_INFO,"Redfish service OS: %s, Version:%s.\n", DiscoveredInstance->Information.Os, DiscoveredInstance->Information.OsVersion));
+    }
+    if (OsVer != NULL) {
+      DiscoveredInstance->Information.OsVersion = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)OsVer) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)OsVer, DiscoveredInstance->Information.OsVersion, AsciiStrSize((const CHAR8 *)OsVer) * sizeof(CHAR16));
+    }
+    if (Product != NULL && ProductVer != NULL) {
+      DiscoveredInstance->Information.Product = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)Product) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)Product, DiscoveredInstance->Information.Product, AsciiStrSize((const CHAR8 *)Product) * sizeof(CHAR16));
+      DiscoveredInstance->Information.ProductVer = (CHAR16 *)AllocatePool(AsciiStrSize((const CHAR8 *)ProductVer) * sizeof(CHAR16));
+      AsciiStrToUnicodeStrS ((const CHAR8 *)ProductVer, DiscoveredInstance->Information.ProductVer, AsciiStrSize((const CHAR8 *)ProductVer) * sizeof(CHAR16));
+      DEBUG ((DEBUG_INFO,"Redfish service product: %s, Version:%s.\n", DiscoveredInstance->Information.Product, DiscoveredInstance->Information.ProductVer));
+    }
+
+    if (RedfishLocation == NULL) {
+      // This is the Redfish reported from SMBIOS 42h
+      // without validation.
+
+      IP4_COPY_ADDRESS((VOID *)&DiscoveredInstance->Information.RedfishHostIpAddress.v4, (VOID *)&Instance->TargetIpAddress.v4);
+    }
+    if (!InfoRefresh) {
+      DiscoveredList->Instance = DiscoveredInstance;
+      InsertTailList(&mRedfishInstanceList, &DiscoveredList->NextInstance);
+    }
+    DiscoveredInstance->Status = EFI_SUCCESS;
+  } else {
+    if (DiscoveredList != NULL) {
+      DEBUG((DEBUG_INFO,"*** This Redfish Service was already found ***\n"));
+      if (DiscoveredInstance->Information.Uuid != NULL) {
+        DEBUG((DEBUG_INFO,"Service UUID: %s.\n", DiscoveredInstance->Information.Uuid));
+      } else {
+        DEBUG((DEBUG_INFO,"Service UUID: unknown.\n"));
+      }
+    }
+  }
+  if (Char16Uuid != NULL) {
+    FreePool((VOID *)Char16Uuid);
+  }
+
+  Status = EFI_SUCCESS;
+  if (NewFound || InfoRefresh) {
+    //
+    // Build up EFI_REDFISH_DISCOVERED_LIST in token.
+    //
+    Instance->DiscoverToken->DiscoverList.NumberOfServiceFound = 1;
+    Instance->DiscoverToken->DiscoverList.RedfishInstances = DiscoveredInstance;
+    DiscoveredInstance->Status = EFI_SUCCESS;
+    if (!InfoRefresh) {
+      Status = CreateRestExInstance (Instance, Instance->DiscoverToken); // Create REST EX child.
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "%a:Can't create REST EX child instance.\n",__FUNCTION__));
+        goto ON_EXIT;
+      }
+      Status = gBS->OpenProtocol ( // Configure local host information.
+                  Instance->DiscoverToken->DiscoverList.RedfishInstances->Information.RedfishRestExHandle,
+                  &gEfiRestExProtocolGuid,
+                  (VOID **)&RestEx,
+                  Instance->NetworkInterface->OpenDriverAgentHandle,
+                  Instance->NetworkInterface->OpenDriverControllerHandle,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+      if (EFI_ERROR (Status)) {
+        DeleteRestEx = TRUE;
+        goto ERROR_EXIT;
+      }
+      RestExOpened = TRUE;
+      RestExHttpConfigData = AllocateZeroPool (sizeof (EFI_REST_EX_HTTP_CONFIG_DATA));
+      if (RestExHttpConfigData == NULL) {
+        Status = EFI_OUT_OF_RESOURCES;
+        DeleteRestEx = TRUE;
+        goto EXIT_FREE_CONFIG_DATA;
+      }
+      RestExHttpConfigData->SendReceiveTimeout = 5000;
+      RestExHttpConfigData->HttpConfigData.HttpVersion = HttpVersion11;
+      RestExHttpConfigData->HttpConfigData.LocalAddressIsIPv6 = CheckIsIpVersion6(NetworkInterface);
+      if (RestExHttpConfigData->HttpConfigData.LocalAddressIsIPv6) {
+        RestExHttpConfigData->HttpConfigData.AccessPoint.IPv6Node = AllocateZeroPool (sizeof (EFI_HTTPv6_ACCESS_POINT));
+        if (RestExHttpConfigData->HttpConfigData.AccessPoint.IPv6Node == NULL) {
+          Status = EFI_OUT_OF_RESOURCES;
+          goto EXIT_FREE_CONFIG_DATA;
+        }
+      } else {
+        RestExHttpConfigData->HttpConfigData.AccessPoint.IPv4Node = AllocateZeroPool (sizeof (EFI_HTTPv4_ACCESS_POINT));
+        if (RestExHttpConfigData->HttpConfigData.AccessPoint.IPv4Node == NULL) {
+          Status = EFI_OUT_OF_RESOURCES;
+          goto EXIT_FREE_CONFIG_DATA;
+        }
+        RestExHttpConfigData->HttpConfigData.AccessPoint.IPv4Node->UseDefaultAddress = TRUE;
+      }
+      Status = RestEx->Configure (
+                       RestEx,
+                       (EFI_REST_EX_CONFIG_DATA)(UINT8 *)RestExHttpConfigData
+                       );
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR,"%a:REST EX configured..\n", __FUNCTION__));
+        DeleteRestEx = TRUE;
+        goto EXIT_FREE_ALL;
+      }
+      //
+      // Signal client, close REST EX before signaling client.
+      //
+      if (RestExOpened) {
+        gBS->CloseProtocol(
+             Instance->DiscoverToken->DiscoverList.RedfishInstances->Information.RedfishRestExHandle,
+             &gEfiRestExProtocolGuid,
+             Instance->NetworkInterface->OpenDriverAgentHandle,
+             Instance->NetworkInterface->OpenDriverControllerHandle
+          );
+        RestExOpened = FALSE;
+      }
+    }
+    Status = gBS->SignalEvent(Instance->DiscoverToken->Event);
+    if (!EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR,"%a:No event to signal!\n", __FUNCTION__));
+    }
+  }
+
+EXIT_FREE_ALL:;
+  if (RestExHttpConfigData != NULL && RestExHttpConfigData->HttpConfigData.AccessPoint.IPv4Node != NULL) {
+    FreePool (RestExHttpConfigData->HttpConfigData.AccessPoint.IPv4Node);
+  }
+
+EXIT_FREE_CONFIG_DATA:;
+  if (RestExHttpConfigData != NULL) {
+    FreePool((VOID *)RestExHttpConfigData);
+  }
+  if (RestExOpened) {
+    gBS->CloseProtocol(
+           Instance->DiscoverToken->DiscoverList.RedfishInstances->Information.RedfishRestExHandle,
+           &gEfiRestExProtocolGuid,
+           Instance->NetworkInterface->OpenDriverAgentHandle,
+           Instance->NetworkInterface->OpenDriverControllerHandle
+        );
+  }
+ERROR_EXIT:;
+    if (DeleteRestEx && RestExOpened) {
+      gBS->CloseProtocol(
+           Instance->DiscoverToken->DiscoverList.RedfishInstances->Information.RedfishRestExHandle,
+           &gEfiRestExProtocolGuid,
+           Instance->NetworkInterface->OpenDriverAgentHandle,
+           Instance->NetworkInterface->OpenDriverControllerHandle
+        );
+    }
+ON_EXIT:;
+  return Status;
+}
+
+/**
+  This function gets the subnet information of this network interface instance.
+  can discover Redfish service on it.
+
+  @param[in]    Instance     EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL instance.
+  @param[in]    ImageHandle  EFI Image handle request the network interface list.
+
+  @retval EFI_SUCCESS
+
+**/
+EFI_STATUS
+NetworkInterfaceGetSubnetInfo (
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *Instance,
+  IN EFI_HANDLE ImageHandle
+  )
+{
+  EFI_STATUS Status;
+  UINT32 ProtocolType;
+  UINT32 IPv6InfoIndex;
+  EFI_IP6_ADDRESS_INFO *ThisSubnetAddrInfoIPv6;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *NewNetworkInterface;
+
+  if (Instance->GotSubnetInfo) {
+    return EFI_SUCCESS;
+  }
+
+  ProtocolType = Instance->NetworkProtocolType;
+  if (gRequiredProtocol [ProtocolType].GetSubnetInfo != NULL && Instance->GotSubnetInfo == FALSE) {
+    Status = gRequiredProtocol [ProtocolType].GetSubnetInfo (
+        ImageHandle,
+        Instance
+        );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR,"%a:Faile to get Subnet infomation.\n", __FUNCTION__));
+      return Status;
+    } else {
+      DEBUG ((DEBUG_INFO,"%a:MAC address: %s\n", __FUNCTION__, Instance->StrMacAddr));
+      if (CheckIsIpVersion6 (Instance)) {
+        if (Instance->SubnetAddrInfoIPv6Number == 0) {
+          DEBUG ((DEBUG_ERROR,"%a: There is no Subnet infomation for IPv6 network interface.\n", __FUNCTION__));
+          return EFI_NOT_FOUND;
+        }
+        ThisSubnetAddrInfoIPv6 = Instance->SubnetAddrInfoIPv6; // First IPv6 address information.
+        IP6_COPY_ADDRESS (&Instance->SubnetAddr.v6, &ThisSubnetAddrInfoIPv6->Address);
+        Instance->SubnetPrefixLength = ThisSubnetAddrInfoIPv6->PrefixLength;
+        DEBUG((DEBUG_INFO,"   IPv6 Subnet ID:%d, Prefix length: %d.\n",
+               ThisSubnetAddrInfoIPv6->Address.Addr [7] + (UINT16)ThisSubnetAddrInfoIPv6->Address.Addr [6] * 256,
+               ThisSubnetAddrInfoIPv6->PrefixLength)
+               );
+        //
+        // If this is IPv6, then we may have to propagate network interface for IPv6 network scopes
+        // according to the Ipv6 address information.
+        //
+        ThisSubnetAddrInfoIPv6 ++;
+        for (IPv6InfoIndex = 0; IPv6InfoIndex < Instance->SubnetAddrInfoIPv6Number - 1; IPv6InfoIndex++) {
+          //
+          // Build up addtional EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL instances.
+          //
+          NewNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)AllocateZeroPool (sizeof (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL));
+          if (NewNetworkInterface != NULL) {
+            CopyMem ((VOID *)NewNetworkInterface, (VOID *)Instance, sizeof (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL)); // Clone information of first instance.
+            IP6_COPY_ADDRESS (&NewNetworkInterface->SubnetAddr.v6, &ThisSubnetAddrInfoIPv6->Address);
+            NewNetworkInterface->SubnetPrefixLength = ThisSubnetAddrInfoIPv6->PrefixLength;
+            NewNetworkInterface->GotSubnetInfo = TRUE;
+            InsertTailList (&mEfiRedfishDiscoverNetworkInterface, &NewNetworkInterface->Entry);
+            ThisSubnetAddrInfoIPv6 ++;
+            mNumNetworkInterface ++;
+            DEBUG((DEBUG_INFO,"   IPv6 Subnet ID:%d, Prefix length: %d.\n",
+                   ThisSubnetAddrInfoIPv6->Address.Addr [7] + (UINT16)ThisSubnetAddrInfoIPv6->Address.Addr [6] * 256,
+                   ThisSubnetAddrInfoIPv6->PrefixLength)
+                  );
+          } else {
+            return EFI_OUT_OF_RESOURCES;
+          }
+        }
+      } else {
+        DEBUG ((DEBUG_INFO,"   IPv4 Subnet:%d.%d.%d.%d Subnet mask: %d.%d.%d.%d.\n",
+                    Instance->SubnetAddr.v4.Addr [0],
+                    Instance->SubnetAddr.v4.Addr [1],
+                    Instance->SubnetAddr.v4.Addr [2],
+                    Instance->SubnetAddr.v4.Addr [3],
+                    Instance->SubnetMask.v4.Addr [0],
+                    Instance->SubnetMask.v4.Addr [1],
+                    Instance->SubnetMask.v4.Addr [2],
+                    Instance->SubnetMask.v4.Addr [3]
+                    ));
+      }
+    }
+  }
+  Instance->GotSubnetInfo = TRUE; // Only try to get Subnet Info once.
+  return EFI_SUCCESS;
+}
+
+/**
+  This function gets the network interface list which Redfish discover protocol
+  can discover Redfish service on it.
+
+  @param[in]    This                  EFI_REDFISH_DISCOVER_PROTOCOL instance.
+  @param[in]    ImageHandle           EFI Image handle request the network interface list,
+  @param[out]   NumberOfNetworkIntfs  Number of network interfaces can do Redfish service discovery.
+  @param[out]   NetworkIntfInstances  Network interface instances. It's an array of instance. The number of entries
+                                      in array is indicated by NumberOfNetworkIntfs.
+                                      Caller has to release the memory
+                                      allocated by Redfish discover protocol.
+
+  @retval EFI_SUCCESS        The information of network interface is returned in NumberOfNetworkIntfs and
+                             NetworkIntfInstances.
+  @retval Others             Fail to return the information of network interface.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishServiceGetNetworkInterface (
+  IN EFI_REDFISH_DISCOVER_PROTOCOL   *This,
+  IN EFI_HANDLE                      ImageHandle,
+  OUT UINTN                          *NumberOfNetworkIntfs,
+  OUT EFI_REDFISH_DISCOVER_NETWORK_INTERFACE **NetworkIntfInstances
+)
+{
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterfaceIntn;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE *ThisNetworkInterface;
+
+  if (NetworkIntfInstances == NULL || NumberOfNetworkIntfs == NULL || ImageHandle == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  *NumberOfNetworkIntfs = 0;
+  *NetworkIntfInstances = NULL;
+
+  if (IsListEmpty ((const LIST_ENTRY*)&mEfiRedfishDiscoverNetworkInterface)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE *)AllocateZeroPool (sizeof (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE) * mNumNetworkInterface);
+  if (ThisNetworkInterface == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  *NetworkIntfInstances = ThisNetworkInterface;
+  ThisNetworkInterfaceIntn = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+  while (TRUE) {
+    ThisNetworkInterface->IsIpv6 = FALSE;
+    if (CheckIsIpVersion6 (ThisNetworkInterfaceIntn)) {
+      ThisNetworkInterface->IsIpv6 = TRUE;
+    }
+    CopyMem((VOID *)&ThisNetworkInterface->MacAddress, &ThisNetworkInterfaceIntn->MacAddress, ThisNetworkInterfaceIntn->HwAddressSize);
+    NetworkInterfaceGetSubnetInfo(ThisNetworkInterfaceIntn, ImageHandle); // Get subnet info.
+    if (!ThisNetworkInterface->IsIpv6) {
+      IP4_COPY_ADDRESS(&ThisNetworkInterface->SubnetId.v4, &ThisNetworkInterfaceIntn->SubnetAddr.v4); // IPv4 subnet information.
+    } else {
+      IP6_COPY_ADDRESS (&ThisNetworkInterface->SubnetId.v6, &ThisNetworkInterfaceIntn->SubnetAddr.v6); // IPv6 subnet information in IPv6 address information.
+    }
+    ThisNetworkInterface->SubnetPrefixLength = ThisNetworkInterfaceIntn->SubnetPrefixLength;
+    ThisNetworkInterface->VlanId = ThisNetworkInterfaceIntn->VlanId;
+    (*NumberOfNetworkIntfs) ++;
+    if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterfaceIntn->Entry)) {
+      break;
+    }
+    ThisNetworkInterfaceIntn = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterfaceIntn->Entry);
+    ThisNetworkInterface ++;
+  };
+  return EFI_SUCCESS;
+}
+/**
+  This function acquires Redfish services by discovering static Redfish setting
+  according to Redfish Host Interface or through SSDP. Returns a list of EFI
+  handles in EFI_REDFISH_DISCOVERED_LIST. Each of EFI handle has cooresponding
+  EFI REST EX instance installed on it. Each REST EX isntance is a child instance which
+  created through EFI REST EX serivce protoocl for communicating with specific
+  Redfish service.
+
+  @param[in]    This                    EFI_REDFISH_DISCOVER_PROTOCOL instance.
+  @param[in]    ImageHandle             EFI image owns these Redfish service instances.
+  @param[in]    TargetNetworkInterface  Target network interface to do the discovery.
+                                        NULL means discover Redfish service on all network interfaces on platform.
+  @param[in]    Flags                   Redfish service discover flags.
+  @param[in]    Token                   EFI_REDFISH_DISCOVERED_TOKEN instance.
+                                        The memory of EFI_REDFISH_DISCOVERED_LIST and the strings in
+                                        EFI_REDFISH_DISCOVERED_INFORMATION are all allocated by Acquire()
+                                        and must be freed when caller invoke Release().
+
+  @retval EFI_SUCCESS             REST EX instance of discovered Redfish services are returned.
+  @retval EFI_INVALID_PARAMETERS  ImageHandle == NULL, Flags == 0, Token == NULL, Token->Timeout > 5,
+                                  or Token->Event == NULL.
+  @retval Others                  Fail acquire Redfish services.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishServiceAcquireService (
+  IN EFI_REDFISH_DISCOVER_PROTOCOL          *This,
+  IN EFI_HANDLE                             ImageHandle,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE  *TargetNetworkInterface,
+  IN EFI_REDFISH_DISCOVER_FLAG              Flags,
+  IN EFI_REDFISH_DISCOVERED_TOKEN           *Token
+  )
+{
+  EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *Instance;
+  EFI_STATUS Status1;
+  EFI_STATUS Status2;
+  BOOLEAN NewInstance;
+  UINTN NumNetworkInterfaces;
+  UINTN NetworkInterfacesIndex;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *TargetNetworkInterfaceInternal;
+
+  DEBUG ((DEBUG_INFO,"%a:Entry.\n", __FUNCTION__));
+
+  //
+  // Validate parameters.
+  //
+  if (ImageHandle == NULL || Token == NULL || ((Flags & ~EFI_REDFISH_DISCOVER_VALIDATION) == 0)) {
+    DEBUG ((DEBUG_ERROR,"%a:Invalid parameters.\n", __FUNCTION__));
+    return EFI_INVALID_PARAMETER;
+  }
+  //
+  // Validate target network interface.
+  //
+  if (EFI_ERROR (ValidateTargetNetworkInterface (TargetNetworkInterface, Flags))) {
+      return EFI_UNSUPPORTED;
+  }
+  if (TargetNetworkInterface != NULL) {
+    TargetNetworkInterfaceInternal = GetTargetNetworkInterfaceInternal (TargetNetworkInterface);
+    NumNetworkInterfaces = 1;
+  } else {
+    TargetNetworkInterfaceInternal = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+    NumNetworkInterfaces = NumberOfNetworkInterface ();
+    if (NumNetworkInterfaces == 0) {
+      DEBUG ((DEBUG_ERROR,"%a:No network interface on platform.\n", __FUNCTION__));
+      return EFI_UNSUPPORTED;
+    }
+  }
+  for (NetworkInterfacesIndex = 0; NetworkInterfacesIndex < NumNetworkInterfaces; NetworkInterfacesIndex ++) {
+    Status1 = EFI_SUCCESS;
+    Status2 = EFI_SUCCESS;
+    NewInstance = FALSE;
+    Instance = GetInstanceByOwner (ImageHandle, TargetNetworkInterfaceInternal, Flags & ~EFI_REDFISH_DISCOVER_VALIDATION); // Check if we can re-use previous instance.
+    if (Instance == NULL) {
+      DEBUG ((DEBUG_INFO,"%a:Create new EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE.\n", __FUNCTION__));
+      Instance = (EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE *)AllocateZeroPool(sizeof(EFI_REDFISH_DISCOVERED_INTERNAL_INSTANCE));
+      if (Instance == NULL) {
+        DEBUG ((DEBUG_ERROR,"%a:Memory allocation fail.\n", __FUNCTION__));
+      }
+      InitializeListHead (&Instance->Entry);
+      Instance->Owner = ImageHandle;
+      Instance->DiscoverFlags = Flags & ~EFI_REDFISH_DISCOVER_VALIDATION;
+      Instance->NetworkInterface = TargetNetworkInterfaceInternal;
+      //
+      // Get subnet information in case subnet information is not set because
+      // RedfishServiceGetNetworkInterfaces hasn't been called yet.
+      //
+      NetworkInterfaceGetSubnetInfo (TargetNetworkInterfaceInternal, ImageHandle);
+      NewInstance = TRUE;
+    }
+    if (TargetNetworkInterfaceInternal->StrMacAddr != NULL) {
+      DEBUG((DEBUG_INFO,"%a:Acquire Redfish service on network interface MAC address:%s.\n", __FUNCTION__, TargetNetworkInterfaceInternal->StrMacAddr));
+    } else {
+      DEBUG((DEBUG_INFO,"%a:WARNING: No MAC address on this network interface.\n", __FUNCTION__));
+    }
+
+    Instance->DiscoverToken = Token; // Always use the latest Token passed by caller.
+    if ((Flags & EFI_REDFISH_DISCOVER_HOST_INTERFACE) != 0) {
+      DEBUG ((DEBUG_INFO,"%a:Redfish HOST interface discovery.\n", __FUNCTION__));
+      Instance->HostIntfValidation = FALSE;
+      if ((Flags & EFI_REDFISH_DISCOVER_VALIDATION) != 0) {
+        Instance->HostIntfValidation = TRUE;
+      }
+      Status1 = DiscoverRedfishHostInterface (Instance); // Discover Redfish service through Redfish Host Interface.
+    }
+    if ((Flags & EFI_REDFISH_DISCOVER_SSDP) != 0) {
+      DEBUG ((DEBUG_ERROR,"%a:Redfish service discovery through SSDP is not supported\n", __FUNCTION__));
+      return EFI_UNSUPPORTED;
+    } else {
+      if (EFI_ERROR (Status1) && EFI_ERROR (Status2)) {
+        FreePool ((VOID *)Instance);
+        DEBUG ((DEBUG_ERROR,"%a:Something wrong on Redfish service discovery Status1=%x, Status2=%x.\n", __FUNCTION__, Status1, Status2));
+      } else {
+        if (NewInstance) {
+          InsertTailList(&mRedfishDiscoverList, &Instance->Entry);
+        }
+      }
+    }
+    if (TargetNetworkInterface == NULL) {
+      //
+      // Discover Redfish services on all of network interfaces.
+      //
+      TargetNetworkInterfaceInternal = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &TargetNetworkInterfaceInternal->Entry);
+    }
+  }
+  return EFI_SUCCESS;
+}
+
+/**
+  This function aborts Redfish service discovery on the given network interface.
+
+  @param[in]    This                    EFI_REDFISH_DISCOVER_PROTOCOL instance.
+  @param[in]    TargetNetworkInterface  Target network interface to do the discovery.
+
+  @retval EFI_SUCCESS             REST EX instance of discovered Redfish services are returned.
+  @retval Others                  Fail to abort Redfish service discovery.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishServiceAbortAcquire (
+  IN EFI_REDFISH_DISCOVER_PROTOCOL      *This,
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE  *TargetNetworkInterface OPTIONAL
+)
+{
+  // This function is used to abort Redfish service discovery through SSDP
+  // on the network interface. SSDP is optionally supprted by EFI_REDFISH_DISCOVER_PROTOCOL,
+  // we dont have implementation for SSDP now.
+
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  This function releases Redfish services found by RedfishServiceAcquire().
+
+  @param[in]    This         EFI_REDFISH_DISCOVER_PROTOCOL instance.
+  @param[in]    InstanceList The Redfish service to release.
+
+  @retval EFI_SUCCESS        REST EX instances of discovered Redfish are released.
+  @retval Others             Fail to remove the entry
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishServiceReleaseService (
+  IN EFI_REDFISH_DISCOVER_PROTOCOL   *This,
+  IN EFI_REDFISH_DISCOVERED_LIST *InstanceList
+  )
+{
+  UINTN NumService;
+  BOOLEAN AnyFailRelease;
+  EFI_REDFISH_DISCOVERED_INSTANCE *ThisRedfishInstance;
+  EFI_REDFISH_DISCOVERED_INTERNAL_LIST *DiscoveredRedfishInstance;
+
+  if (IsListEmpty (&mRedfishInstanceList)) {
+    DEBUG ((DEBUG_ERROR,"%a:No any discovered Redfish service.\n", __FUNCTION__));
+    return EFI_NOT_FOUND;
+  }
+  AnyFailRelease = FALSE;
+  ThisRedfishInstance = InstanceList->RedfishInstances;
+  for (NumService = 0; NumService < InstanceList->NumberOfServiceFound; NumService ++) {
+    DiscoveredRedfishInstance = (EFI_REDFISH_DISCOVERED_INTERNAL_LIST *)GetFirstNode(&mRedfishInstanceList);
+    do {
+      if (DiscoveredRedfishInstance->Instance == ThisRedfishInstance) {
+        RemoveEntryList (&DiscoveredRedfishInstance->NextInstance);
+        if (ThisRedfishInstance->Information.Location != NULL) {
+          FreePool (ThisRedfishInstance->Information.Location);
+        }
+        if (ThisRedfishInstance->Information.Uuid != NULL) {
+          FreePool (ThisRedfishInstance->Information.Uuid);
+        }
+        if (ThisRedfishInstance->Information.Os != NULL) {
+          FreePool (ThisRedfishInstance->Information.Os);
+        }
+        if (ThisRedfishInstance->Information.OsVersion != NULL) {
+          FreePool (ThisRedfishInstance->Information.OsVersion);
+        }
+        if (ThisRedfishInstance->Information.Product != NULL) {
+          FreePool (ThisRedfishInstance->Information.Product);
+        }
+        if (ThisRedfishInstance->Information.ProductVer != NULL) {
+          FreePool (ThisRedfishInstance->Information.ProductVer);
+        }
+        FreePool((VOID *)ThisRedfishInstance);
+        goto ReleaseNext;
+      }
+
+      if (IsNodeAtEnd(&mRedfishInstanceList, &DiscoveredRedfishInstance->NextInstance)) {
+        break;
+      }
+      DiscoveredRedfishInstance = (EFI_REDFISH_DISCOVERED_INTERNAL_LIST *)GetNextNode(&mRedfishInstanceList, &DiscoveredRedfishInstance->NextInstance);
+    } while (TRUE);
+    AnyFailRelease = TRUE;
+ReleaseNext:;
+    //
+    // Release next discovered Redfish Service.
+    //
+    ThisRedfishInstance = (EFI_REDFISH_DISCOVERED_INSTANCE *)((UINT8 *)ThisRedfishInstance + sizeof (EFI_REDFISH_DISCOVERED_INSTANCE));
+  }
+  if (AnyFailRelease) {
+    return EFI_NOT_FOUND;
+  } else {
+    return EFI_SUCCESS;
+  }
+}
+
+EFI_REDFISH_DISCOVER_PROTOCOL mRedfishDiscover = {
+  RedfishServiceGetNetworkInterface,
+  RedfishServiceAcquireService,
+  RedfishServiceAbortAcquire,
+  RedfishServiceReleaseService
+};
+
+/**
+  This function create an EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL for the
+  given network interface.
+
+
+  @param[in]  ControllerHandle    MAC address of this network interface.
+  @param[in]  NetworkProtocolType Network protocol type.
+  @param[out] IsNewInstance       BOOLEAN means new instance or not.
+  @param[out] NetworkInterface    Pointer to to EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL.
+
+  @retval EFI_STATUS
+**/
+EFI_STATUS
+CreateRedfishDiscoverNetworkInterface (
+  IN EFI_HANDLE ControllerHandle,
+  IN UINT32 NetworkProtocolType,
+  OUT BOOLEAN  *IsNewInstance,
+  OUT EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL **NetworkInterface
+  )
+{
+  EFI_MAC_ADDRESS MacAddress;
+  UINTN HwAddressSize;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *NewNetworkInterface;
+
+  NetLibGetMacAddress (ControllerHandle, &MacAddress, &HwAddressSize);
+  NewNetworkInterface = NULL;
+  *IsNewInstance = TRUE;
+  if (!IsListEmpty ((const LIST_ENTRY*)&mEfiRedfishDiscoverNetworkInterface)) {
+    //
+    // Check if this instance already exist.
+    //
+    ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+    if (ThisNetworkInterface != NULL) {
+      while (TRUE) {
+        if ((CompareMem ((CONST VOID *)&ThisNetworkInterface->MacAddress.Addr, (CONST VOID *)&MacAddress.Addr, HwAddressSize) == 0) &&
+             (ThisNetworkInterface->NetworkProtocolType == NetworkProtocolType)){
+          NewNetworkInterface = ThisNetworkInterface;
+          *IsNewInstance = FALSE;
+          break;
+        }
+        if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry)) {
+          NewNetworkInterface = NULL;
+          break;
+        }
+        ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry);
+      };
+    }
+  }
+  if (NewNetworkInterface == NULL) {
+    //
+    // Create a new instance.
+    //
+    NewNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)AllocateZeroPool (sizeof (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL));
+    if (NewNetworkInterface == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+    NewNetworkInterface->HwAddressSize = HwAddressSize;
+    CopyMem (&NewNetworkInterface->MacAddress.Addr, &MacAddress.Addr, NewNetworkInterface->HwAddressSize);
+    NetLibGetMacString (ControllerHandle, NULL, &NewNetworkInterface->StrMacAddr);
+    NewNetworkInterface->VlanId = NetLibGetVlanId (ControllerHandle);
+  }
+  *NetworkInterface = NewNetworkInterface;
+  return EFI_SUCCESS;
+}
+
+/**
+  This function destory network interface
+
+
+  @param[in]  ThisNetworkInterface EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL instance.
+
+  @retval EFI_STATUS
+**/
+EFI_STATUS
+DestroyRedfishNetwrokInterface (
+  IN EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface
+  )
+{
+  EFI_STATUS Status;
+
+  Status = gBS->UninstallProtocolInterface(
+                  ThisNetworkInterface->OpenDriverControllerHandle,
+                  gRequiredProtocol [ThisNetworkInterface->NetworkProtocolType].DiscoveredProtocolGuid,
+                  &ThisNetworkInterface->NetworkInterfaceProtocolInfo.ProtocolDiscoverId
+                  );
+  RemoveEntryList (&ThisNetworkInterface->Entry);
+  mNumNetworkInterface --;
+  FreePool (ThisNetworkInterface);
+  return Status;
+}
+
+/**
+  Tests to see if the required protocols are provided on the given
+  controller handle.
+
+  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle     The handle of the controller to test. This handle
+                                   must support a protocol interface that supplies
+                                   an I/O abstraction to the driver.
+  @retval EFI_SUCCESS              One of required protocol is found.
+  @retval EFI_UNSUPPORTED          None of required protocol is found.
+**/
+EFI_STATUS
+TestForRequiredProtocols (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE ControllerHandle
+  )
+{
+  UINT32 Id;
+  UINTN Index;
+  EFI_STATUS Status;
+
+  for (Index = 0; Index < (sizeof (gRequiredProtocol) / sizeof (REDFISH_DISCOVER_REQUIRED_PROTOCOL)); Index ++) {
+    Status = gBS->OpenProtocol (
+                  ControllerHandle,
+                  gRequiredProtocol [Index].RequiredServiceBindingProtocolGuid,
+                  NULL,
+                  This->DriverBindingHandle,
+                  ControllerHandle,
+                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
+                  );
+    if (!EFI_ERROR (Status)) {
+      Status = gBS->OpenProtocol (
+                      ControllerHandle,
+                      gRequiredProtocol [Index].DiscoveredProtocolGuid,
+                      (VOID **) &Id,
+                      This->DriverBindingHandle,
+                      ControllerHandle,
+                      EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                      );
+      if (EFI_ERROR (Status)) {
+        DEBUG((DEBUG_ERROR, "%a: %s is found on this controller handle.\n", __FUNCTION__, gRequiredProtocol [Index].ProtocolName));
+        return EFI_SUCCESS;
+      }
+    }
+  }
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Build up network interface and create corresponding service through the given
+  controller handle.
+
+  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle     The handle of the controller to test. This handle
+                                   must support a protocol interface that supplies
+                                   an I/O abstraction to the driver.
+  @retval EFI_SUCCESS              One of required protocol is found.
+  @retval EFI_UNSUPPORTED          None of required protocol is found.
+  @retval EFI_UNSUPPORTED          Failed to build up network interface.
+**/
+EFI_STATUS
+BuildupNetworkInterface (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE ControllerHandle
+  )
+{
+  UINT32 Id;
+  UINT32 Index;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *NetworkInterface;
+  BOOLEAN IsNew;
+  EFI_STATUS Status;
+  VOID *TempInterface;
+  VOID **Interface;
+  UINT32 *ProtocolDiscoverIdPtr;
+  EFI_HANDLE OpenDriverAgentHandle;
+  EFI_HANDLE OpenDriverControllerHandle;
+  EFI_HANDLE *HandleOfProtocolInterfacePtr;
+  EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL *RestExInstance;
+  EFI_TPL OldTpl;
+  BOOLEAN NewNetworkInterfaceInstalled;
+
+  NewNetworkInterfaceInstalled = FALSE;
+  Index = 0;
+  do {
+    Status = gBS->OpenProtocol ( // Already in list?
+                    ControllerHandle,
+                    gRequiredProtocol [Index].DiscoveredProtocolGuid,
+                    (VOID **) &Id,
+                    This->DriverBindingHandle,
+                    ControllerHandle,
+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                    );
+    if (!EFI_ERROR (Status)) {
+      Index ++;
+      if (Index == (sizeof(gRequiredProtocol) / sizeof(REDFISH_DISCOVER_REQUIRED_PROTOCOL))) {
+        break;
+      }
+      continue;
+    }
+
+    Status = gBS->OpenProtocol (
+                    ControllerHandle,
+                    gRequiredProtocol [Index].RequiredServiceBindingProtocolGuid,
+                    &TempInterface,
+                    This->DriverBindingHandle,
+                    ControllerHandle,
+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                    );
+    if (EFI_ERROR (Status)) {
+      Index ++;
+      if (Index == (sizeof(gRequiredProtocol) / sizeof(REDFISH_DISCOVER_REQUIRED_PROTOCOL))) {
+        break;
+      }
+      continue;
+    }
+    if (gRequiredProtocol [Index].ProtocolType != ProtocolTypeRestEx) {
+      OldTpl = gBS->RaiseTPL (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_TPL);
+      Status = CreateRedfishDiscoverNetworkInterface(ControllerHandle, gRequiredProtocol [Index].ProtocolType, &IsNew, &NetworkInterface);
+      if (EFI_ERROR (Status)) {
+        gBS->RestoreTPL (OldTpl);
+        return Status;
+      }
+      NetworkInterface->NetworkProtocolType = gRequiredProtocol [Index].ProtocolType;
+      NetworkInterface->OpenDriverAgentHandle = This->DriverBindingHandle;
+      NetworkInterface->OpenDriverControllerHandle = ControllerHandle;
+      NetworkInterface->NetworkInterfaceProtocolInfo.ProtocolGuid = \
+        *gRequiredProtocol [Index].RequiredProtocolGuid;
+      NetworkInterface->NetworkInterfaceProtocolInfo.ProtocolServiceGuid = \
+        *gRequiredProtocol [Index].RequiredServiceBindingProtocolGuid;
+      ProtocolDiscoverIdPtr = &NetworkInterface->NetworkInterfaceProtocolInfo.ProtocolDiscoverId;
+      OpenDriverAgentHandle = NetworkInterface->OpenDriverAgentHandle;
+      OpenDriverControllerHandle = NetworkInterface->OpenDriverControllerHandle;
+      HandleOfProtocolInterfacePtr = &NetworkInterface->NetworkInterfaceProtocolInfo.ProtocolControllerHandle;
+      Interface = &NetworkInterface->NetworkInterfaceProtocolInfo.NetworkProtocolInterface;
+      NewNetworkInterfaceInstalled = TRUE;
+      if (IsNew) {
+        InsertTailList (&mEfiRedfishDiscoverNetworkInterface, &NetworkInterface->Entry);
+        mNumNetworkInterface ++;
+      }
+      gBS->RestoreTPL (OldTpl);
+    } else {
+      // Record REST_EX instance. REST_EX is created when clinet asks for Redfish service discovery.
+      // Redfish Service Discover protocol will match REST EX to the corresponding EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL
+      // when discovery.
+
+      RestExInstance = (EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL *)AllocateZeroPool (sizeof (EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL));
+      if (RestExInstance == NULL) {
+        return EFI_OUT_OF_RESOURCES;
+      }
+      RestExInstance->OpenDriverAgentHandle = This->DriverBindingHandle;
+      RestExInstance->OpenDriverControllerHandle = ControllerHandle;
+      RestExInstance->RestExControllerHandle = ControllerHandle;
+      InitializeListHead (&RestExInstance->Entry);
+      InsertTailList (&mEfiRedfishDiscoverRestExInstance, &RestExInstance->Entry);
+      mNumRestExInstance ++;
+      ProtocolDiscoverIdPtr = &RestExInstance->RestExId;
+      OpenDriverAgentHandle = RestExInstance->OpenDriverAgentHandle;
+      OpenDriverControllerHandle = RestExInstance->OpenDriverControllerHandle;
+      HandleOfProtocolInterfacePtr = &RestExInstance->RestExChildHandle;
+      Interface = (VOID **)&RestExInstance->RestExProtocolInterface;
+    }
+    Status = gBS->InstallProtocolInterface (
+                    &ControllerHandle,
+                    gRequiredProtocol [Index].DiscoveredProtocolGuid,
+                    EFI_NATIVE_INTERFACE,
+                    ProtocolDiscoverIdPtr
+                    );
+    if (EFI_ERROR (Status)) {
+      Index ++;
+      if (Index == (sizeof(gRequiredProtocol) / sizeof(REDFISH_DISCOVER_REQUIRED_PROTOCOL))) {
+        break;
+      }
+      continue;
+    }
+    //
+    // Create service binding child and open it BY_DRIVER.
+    //
+    Status = NetLibCreateServiceChild (
+              ControllerHandle,
+              This->ImageHandle,
+              gRequiredProtocol [Index].RequiredServiceBindingProtocolGuid,
+              HandleOfProtocolInterfacePtr
+              );
+    if (!EFI_ERROR (Status)) {
+      Status = gBS->OpenProtocol (
+                    *HandleOfProtocolInterfacePtr,
+                    gRequiredProtocol [Index].RequiredProtocolGuid,
+                    Interface,
+                    OpenDriverAgentHandle,
+                    OpenDriverControllerHandle,
+                    EFI_OPEN_PROTOCOL_BY_DRIVER
+                    );
+      if (!EFI_ERROR (Status)) {
+        if (EfiRedfishDiscoverProtocolHandle == NULL &&
+            (gRequiredProtocol [Index].ProtocolType == ProtocolTypeRestEx) &&
+            !IsListEmpty (&mEfiRedfishDiscoverNetworkInterface)
+            ) {
+          // Install the fisrt Redfish Discover Protocol when EFI REST EX protcol is discovered.
+          // This ensures EFI REST EX is ready while EFI_REDFISH_DISCOVER_PROTOCOL consumer acquires
+          // Redfish serivce over network interface.
+
+          Status = gBS->InstallProtocolInterface (
+                          &EfiRedfishDiscoverProtocolHandle,
+                          &gEfiRedfishDiscoverProtocolGuid,
+                          EFI_NATIVE_INTERFACE,
+                          (VOID *)&mRedfishDiscover
+                          );
+        } else if (EfiRedfishDiscoverProtocolHandle != NULL && NewNetworkInterfaceInstalled) {
+           Status = gBS->ReinstallProtocolInterface (
+                            EfiRedfishDiscoverProtocolHandle,
+                            &gEfiRedfishDiscoverProtocolGuid,
+                            (VOID *)&mRedfishDiscover,
+                            (VOID *)&mRedfishDiscover
+                            );
+           NewNetworkInterfaceInstalled = FALSE;
+        }
+      }
+      return Status;
+    } else {
+      Index ++;
+      if (Index == (sizeof(gRequiredProtocol) / sizeof(REDFISH_DISCOVER_REQUIRED_PROTOCOL))) {
+        break;
+      }
+      continue;
+    }
+  } while (Index < (sizeof(gRequiredProtocol) / sizeof(REDFISH_DISCOVER_REQUIRED_PROTOCOL)));
+  return EFI_UNSUPPORTED;
+}
+/**
+  Close the protocol opened for Redfish discovery. This function also destories
+  the network services.
+
+  @param[in]  ThisBindingProtocol     A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle        The handle of the controller to test. This handle
+                                      must support a protocol interface that supplies
+                                      an I/O abstraction to the driver.
+  @param[in]  ThisRequiredProtocol    Pointer to the instance of REDFISH_DISCOVER_REQUIRED_PROTOCOL.
+  @param[in]  DriverAgentHandle      Driver agent handle which used to open protocol earlier.
+  @param[in]  DriverControllerHandle Driver controller handle which used to open protocol earlier.
+
+  @retval EFI_SUCCESS                Prorocol is closed successfully.
+  @retval Others                     Prorocol is closed unsuccessfully.
+
+**/
+EFI_STATUS
+CloseProtocolService (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *ThisBindingProtocol,
+  IN EFI_HANDLE  ControllerHandle,
+  IN REDFISH_DISCOVER_REQUIRED_PROTOCOL *ThisRequiredProtocol,
+  IN EFI_HANDLE DriverAgentHandle,
+  IN EFI_HANDLE DriverControllerHandle
+)
+{
+  EFI_STATUS Status;
+
+  Status = gBS->CloseProtocol (
+                   ControllerHandle,
+                   ThisRequiredProtocol->RequiredProtocolGuid,
+                   DriverAgentHandle,
+                   DriverControllerHandle
+                   );
+  if (!EFI_ERROR (Status)) {
+    NetLibDestroyServiceChild(
+      ControllerHandle,
+      ThisBindingProtocol->ImageHandle,
+      ThisRequiredProtocol->RequiredServiceBindingProtocolGuid,
+      ControllerHandle
+      );
+  }
+  return Status;
+}
+/**
+  Stop the services on network interface.
+
+  @param[in]  ThisBindingProtocol  A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle     The handle of the controller to test. This handle
+                                   must support a protocol interface that supplies
+                                   an I/O abstraction to the driver.
+  @retval EFI_SUCCESS              One of required protocol is found.
+  @retval Others                   Faile to stop the services on network interface.
+**/
+EFI_STATUS
+StopServiceOnNetworkInterface (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *ThisBindingProtocol,
+  IN EFI_HANDLE ControllerHandle
+  )
+{
+  UINT32 Index;
+  EFI_STATUS Status;
+  VOID *Interface;
+  EFI_TPL OldTpl;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+  EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL *RestExInstance;
+
+  for (Index = 0; Index < (sizeof (gRequiredProtocol) / sizeof (REDFISH_DISCOVER_REQUIRED_PROTOCOL)); Index ++) {
+    Status = gBS->HandleProtocol (
+                  ControllerHandle,
+                  gRequiredProtocol [Index].RequiredProtocolGuid,
+                  (VOID **)&Interface
+                  );
+    if (!EFI_ERROR (Status)) {
+      if (gRequiredProtocol [Index].ProtocolType != ProtocolTypeRestEx) {
+        if (IsListEmpty (&mEfiRedfishDiscoverNetworkInterface)) {
+          return EFI_NOT_FOUND;
+        }
+        OldTpl = gBS->RaiseTPL (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_TPL);
+        ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+        while (TRUE) {
+          if (ThisNetworkInterface->NetworkInterfaceProtocolInfo.ProtocolControllerHandle == ControllerHandle) {
+
+            Status = CloseProtocolService ( // Close protocol and destroy service.
+                       ThisBindingProtocol,
+                       ControllerHandle,
+                       &gRequiredProtocol [Index],
+                       ThisNetworkInterface->OpenDriverAgentHandle,
+                       ThisNetworkInterface->OpenDriverControllerHandle
+                       );
+            if (!EFI_ERROR (Status)) {
+              Status = DestroyRedfishNetwrokInterface (ThisNetworkInterface);
+            }
+            gBS->RestoreTPL (OldTpl);
+            // Reinstall Redfish Discover protocol to notify network
+            // interface change.
+
+            Status = gBS->ReinstallProtocolInterface (
+                            EfiRedfishDiscoverProtocolHandle,
+                            &gEfiRedfishDiscoverProtocolGuid,
+                            (VOID *)&mRedfishDiscover,
+                            (VOID *)&mRedfishDiscover
+                            );
+            if (EFI_ERROR (Status)) {
+              DEBUG((DEBUG_ERROR, "%a: Reinstall gEfiRedfishDiscoverProtocolGuid fail.", __FUNCTION__));
+            }
+            return Status;
+          }
+          if (IsNodeAtEnd (&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry)) {
+            break;
+          }
+          ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverNetworkInterface, &ThisNetworkInterface->Entry);
+        };
+        gBS->RestoreTPL (OldTpl);
+      } else {
+        if (IsListEmpty (&mEfiRedfishDiscoverRestExInstance)) {
+          return EFI_NOT_FOUND;
+        }
+        OldTpl = gBS->RaiseTPL (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_TPL);
+        RestExInstance = (EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverRestExInstance);
+        while (TRUE) {
+          if (RestExInstance->RestExChildHandle == ControllerHandle) {
+            Status = CloseProtocolService ( // Close REST_EX protocol.
+                       ThisBindingProtocol,
+                       ControllerHandle,
+                       &gRequiredProtocol [Index],
+                       RestExInstance->OpenDriverAgentHandle,
+                       RestExInstance->OpenDriverControllerHandle
+                       );
+            RemoveEntryList (&RestExInstance->Entry);
+            FreePool ((VOID *)RestExInstance);
+            mNumRestExInstance --;
+            gBS->RestoreTPL (OldTpl);
+            return Status;
+          }
+          if (IsNodeAtEnd (&mEfiRedfishDiscoverRestExInstance, &RestExInstance->Entry)) {
+            break;
+          }
+          RestExInstance = (EFI_REDFISH_DISCOVER_REST_EX_INSTANCE_INTERNAL *)GetNextNode(&mEfiRedfishDiscoverRestExInstance, &RestExInstance->Entry);
+        };
+        gBS->RestoreTPL (OldTpl);
+      }
+    }
+  }
+  return EFI_NOT_FOUND;
+}
+/**
+  Tests to see if this driver supports a given controller. If a child device is provided,
+  it further tests to see if this driver supports creating a handle for the specified child device.
+
+  This function checks to see if the driver specified by This supports the device specified by
+  ControllerHandle. Drivers will typically use the device path attached to
+  ControllerHandle and/or the services from the bus I/O abstraction attached to
+  ControllerHandle to determine if the driver supports ControllerHandle. This function
+  may be called many times during platform initialization. In order to reduce boot times, the tests
+  performed by this function must be very small, and take as little time as possible to execute. This
+  function must not change the state of any hardware devices, and this function must be aware that the
+  device specified by ControllerHandle may already be managed by the same driver or a
+  different driver. This function must match its calls to AllocatePages() with FreePages(),
+  AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
+  Because ControllerHandle may have been previously started by the same driver, if a protocol is
+  already in the opened state, then it must not be closed with CloseProtocol(). This is required
+  to guarantee the state of ControllerHandle is not modified by this function.
+
+  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle     The handle of the controller to test. This handle
+                                   must support a protocol interface that supplies
+                                   an I/O abstraction to the driver.
+  @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This
+                                   parameter is ignored by device drivers, and is optional for bus
+                                   drivers. For bus drivers, if this parameter is not NULL, then
+                                   the bus driver must determine if the bus controller specified
+                                   by ControllerHandle and the child controller specified
+                                   by RemainingDevicePath are both supported by this
+                                   bus driver.
+
+  @retval EFI_SUCCESS              The device specified by ControllerHandle and
+                                   RemainingDevicePath is supported by the driver specified by This.
+  @retval EFI_ALREADY_STARTED      The device specified by ControllerHandle and
+                                   RemainingDevicePath is already being managed by the driver
+                                   specified by This.
+  @retval EFI_ACCESS_DENIED        The device specified by ControllerHandle and
+                                   RemainingDevicePath is already being managed by a different
+                                   driver or an application that requires exclusive access.
+                                   Currently not implemented.
+  @retval EFI_UNSUPPORTED          The device specified by ControllerHandle and
+                                   RemainingDevicePath is not supported by the driver specified by This.
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverDriverBindingSupported (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   ControllerHandle,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
+  )
+{
+  return TestForRequiredProtocols (This, ControllerHandle);
+}
+
+/**
+  Starts a device controller or a bus controller.
+
+  The Start() function is designed to be invoked from the EFI boot service ConnectController().
+  As a result, much of the error checking on the parameters to Start() has been moved into this
+  common boot service. It is legal to call Start() from other locations,
+  but the following calling restrictions must be followed, or the system behavior will not be deterministic.
+  1. ControllerHandle must be a valid EFI_HANDLE.
+  2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
+     EFI_DEVICE_PATH_PROTOCOL.
+  3. Prior to calling Start(), the Supported() function for the driver specified by This must
+     have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
+
+  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle     The handle of the controller to start. This handle
+                                   must support a protocol interface that supplies
+                                   an I/O abstraction to the driver.
+  @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This
+                                   parameter is ignored by device drivers, and is optional for bus
+                                   drivers. For a bus driver, if this parameter is NULL, then handles
+                                   for all the children of Controller are created by this driver.
+                                   If this parameter is not NULL and the first Device Path Node is
+                                   not the End of Device Path Node, then only the handle for the
+                                   child device specified by the first Device Path Node of
+                                   RemainingDevicePath is created by this driver.
+                                   If the first Device Path Node of RemainingDevicePath is
+                                   the End of Device Path Node, no child handle is created by this
+                                   driver.
+
+  @retval EFI_SUCCESS              The device was started.
+  @retval EFI_DEVICE_ERROR         The device could not be started due to a device error.Currently not implemented.
+  @retval EFI_OUT_OF_RESOURCES     The request could not be completed due to a lack of resources.
+  @retval Others                   The driver failded to start the device.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverDriverBindingStart (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   ControllerHandle,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
+  )
+{
+  return BuildupNetworkInterface (This, ControllerHandle);
+}
+
+/**
+  Stops a device controller or a bus controller.
+
+  The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
+  As a result, much of the error checking on the parameters to Stop() has been moved
+  into this common boot service. It is legal to call Stop() from other locations,
+  but the following calling restrictions must be followed, or the system behavior will not be deterministic.
+  1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
+     same driver's Start() function.
+  2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
+     EFI_HANDLE. In addition, all of these handles must have been created in this driver's
+     Start() function, and the Start() function must have called OpenProtocol() on
+     ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
+
+  @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+  @param[in]  ControllerHandle  A handle to the device being stopped. The handle must
+                                support a bus specific I/O protocol for the driver
+                                to use to stop the device.
+  @param[in]  NumberOfChildren  The number of child device handles in ChildHandleBuffer.
+  @param[in]  ChildHandleBuffer An array of child handles to be freed. May be NULL
+                                if NumberOfChildren is 0.
+
+  @retval EFI_SUCCESS           The device was stopped.
+  @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device error.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverDriverBindingStop (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   ControllerHandle,
+  IN UINTN                        NumberOfChildren,
+  IN EFI_HANDLE                   *ChildHandleBuffer OPTIONAL
+  )
+{
+  return StopServiceOnNetworkInterface (This, ControllerHandle);
+}
+
+EFI_DRIVER_BINDING_PROTOCOL gRedfishDiscoverDriverBinding = {
+  RedfishDiscoverDriverBindingSupported,
+  RedfishDiscoverDriverBindingStart,
+  RedfishDiscoverDriverBindingStop,
+  REDFISH_DISCOVER_VERSION,
+  NULL,
+  NULL
+};
+
+/**
+  This is the declaration of an EFI image entry point.
+
+  @param  ImageHandle           The firmware allocated handle for the UEFI image.
+  @param  SystemTable           A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval Others                An unexpected error occurred.
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS Status;
+
+  Status = EFI_SUCCESS;
+  InitializeListHead (&mRedfishDiscoverList);
+  InitializeListHead (&mRedfishInstanceList);
+  InitializeListHead (&mEfiRedfishDiscoverNetworkInterface);
+  InitializeListHead (&mEfiRedfishDiscoverRestExInstance);
+  //
+  // Install binding protoocl to obtain UDP and REST EX protocol.
+  //
+  Status = EfiLibInstallDriverBindingComponentName2 (
+             ImageHandle,
+             SystemTable,
+             &gRedfishDiscoverDriverBinding,
+             ImageHandle,
+             &gRedfishDiscoverComponentName,
+             &gRedfishDiscoverComponentName2
+             );
+  return Status;
+}
+
+/**
+  This is the unload handle for Redfish discover module.
+
+  Disconnect the driver specified by ImageHandle from all the devices in the handle database.
+  Uninstall all the protocols installed in the driver entry point.
+
+  @param[in] ImageHandle           The drivers' driver image.
+
+  @retval    EFI_SUCCESS           The image is unloaded.
+  @retval    Others                Failed to unload the image.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishDiscoverUnload (
+  IN EFI_HANDLE ImageHandle
+  )
+{
+  EFI_STATUS Status;
+  EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *ThisNetworkInterface;
+
+  Status = EFI_SUCCESS;
+  // Destroy all network interfaces found by EFI Redfish Discover driver and
+  // stop services created for Redfish Discover.
+
+  while (!IsListEmpty (&mEfiRedfishDiscoverNetworkInterface)) {
+    ThisNetworkInterface = (EFI_REDFISH_DISCOVER_NETWORK_INTERFACE_INTERNAL *)GetFirstNode (&mEfiRedfishDiscoverNetworkInterface);
+    StopServiceOnNetworkInterface (&gRedfishDiscoverDriverBinding, ThisNetworkInterface->NetworkInterfaceProtocolInfo.ProtocolControllerHandle);
+  };
+  // Disconnect EFI Redfish discover driver controller to notify the
+  // clinet which uses .EFI Redfish discover protocol.
+
+  if (EfiRedfishDiscoverProtocolHandle != NULL) {
+    //
+    // Notify user EFI_REDFISH_DISCOVER_PROTOCOL is unloaded.
+    //
+    gBS->DisconnectController (EfiRedfishDiscoverProtocolHandle, NULL, NULL);
+    Status = gBS->UninstallProtocolInterface(
+                    EfiRedfishDiscoverProtocolHandle,
+                    &gEfiRedfishDiscoverProtocolGuid,
+                    (VOID *)&mRedfishDiscover
+                    );
+  }
+  return Status;
+}
diff --git a/RedfishPkg/RedfishDiscoverDxe/RedfishSmbiosHostInterface.c b/RedfishPkg/RedfishDiscoverDxe/RedfishSmbiosHostInterface.c
new file mode 100644
index 0000000000..f3ad36ec3a
--- /dev/null
+++ b/RedfishPkg/RedfishDiscoverDxe/RedfishSmbiosHostInterface.c
@@ -0,0 +1,118 @@
+/** @file
+  RedfishSmbiosHostInterface.c
+
+  Discover Redfish SMBIOS Host Interface.
+
+  (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "RedfishDiscoverInternal.h"
+
+SMBIOS_TABLE_TYPE42  *mType42Record;
+
+/**
+  The function gets information reported in Redfish Host Interface.
+
+  It simply frees the packet.
+
+  @param[in]  Smbios           SMBIOS protocol.
+  @param[out] DeviceDescriptor Pointer to REDFISH_INTERFACE_DATA.
+  @param[out] ProtocolData     Pointer to REDFISH_OVER_IP_PROTOCOL_DATA.
+
+  @retval EFI_SUCCESS    Get host interface succesfully.
+  @retval Otherwise      Fail to tet host interface.
+
+**/
+EFI_STATUS
+RedfishGetHostInterfaceProtocolData (
+  IN EFI_SMBIOS_PROTOCOL              *Smbios,
+  OUT REDFISH_INTERFACE_DATA          **DeviceDescriptor,
+  OUT REDFISH_OVER_IP_PROTOCOL_DATA   **ProtocolData
+  )
+{
+  EFI_STATUS                        Status;
+  EFI_SMBIOS_HANDLE                 SmbiosHandle;
+  EFI_SMBIOS_TABLE_HEADER           *Record;
+  UINT16                            Offset;
+  UINT8                             *RecordTmp;
+  UINT8                             ProtocolLength;
+  UINT8                             SpecificDataLen;
+
+  if ((Smbios == NULL) || (ProtocolData == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  SmbiosHandle = SMBIOS_HANDLE_PI_RESERVED;
+  Status = Smbios->GetNext (Smbios, &SmbiosHandle, NULL, &Record, NULL);
+  while (!EFI_ERROR (Status) && SmbiosHandle != SMBIOS_HANDLE_PI_RESERVED) {
+    if (Record->Type == SMBIOS_TYPE_MANAGEMENT_CONTROLLER_HOST_INTERFACE) {
+      //
+      // Check Interface Type, should be Network Host Interface = 40h
+      //
+      mType42Record = (SMBIOS_TABLE_TYPE42 *) Record;
+      if (mType42Record->InterfaceType == MCHostInterfaceTypeNetworkHostInterface) {
+        ASSERT (Record->Length >= 9);
+        Offset = 5;
+        RecordTmp = (UINT8 *) Record + Offset;
+        //
+        // Get interface specific data length.
+        //
+        SpecificDataLen = *RecordTmp;
+        Offset += 1;
+        RecordTmp = (UINT8 *) Record + Offset;
+
+        //
+        // Check Device Type, only PCI/PCIe Network Interface v2 is supported now.
+        //
+        if (*RecordTmp == REDFISH_HOST_INTERFACE_DEVICE_TYPE_PCI_PCIE_V2) {
+          ASSERT (SpecificDataLen == sizeof (PCI_OR_PCIE_INTERFACE_DEVICE_DESCRIPTOR_V2) + 1);
+          *DeviceDescriptor = (REDFISH_INTERFACE_DATA *)RecordTmp;
+          Offset = Offset + SpecificDataLen;
+          RecordTmp = (UINT8 *) Record + Offset;
+          //
+          // Check Protocol count. if > 1, only use the first protocol.
+          //
+          ASSERT (*RecordTmp == 1);
+          Offset += 1;
+          RecordTmp = (UINT8 *) Record + Offset;
+          //
+          // Check protocol identifier.
+          //
+          if (*RecordTmp == MCHostInterfaceProtocolTypeRedfishOverIP) {
+            Offset += 1;
+            RecordTmp = (UINT8 *) Record + Offset;
+            ProtocolLength = *RecordTmp;
+
+            Offset += 1;
+            RecordTmp = (UINT8 *) Record + Offset;
+
+            //
+            // This SMBIOS record is invalid, if the length of protocol specific data for
+            // Redfish Over IP protocol is wrong.
+            //
+            if ((*(RecordTmp + 90) + sizeof (REDFISH_OVER_IP_PROTOCOL_DATA) - 1) != ProtocolLength) {
+              return EFI_SECURITY_VIOLATION;
+            }
+
+            Offset += ProtocolLength;
+            //
+            // This SMBIOS record is invalid, if the length is smaller than the offset.
+            //
+            if (Offset > mType42Record->Hdr.Length) {
+              return EFI_SECURITY_VIOLATION;
+            }
+            *ProtocolData = (REDFISH_OVER_IP_PROTOCOL_DATA *)RecordTmp;
+            return EFI_SUCCESS;
+          }
+        }
+      }
+    }
+    Status = Smbios->GetNext (Smbios, &SmbiosHandle, NULL, &Record, NULL);
+  }
+
+  *ProtocolData = NULL;
+  return EFI_NOT_FOUND;
+}
-- 
2.17.1



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