[PATCH 0/3] BMC USBNIC Platform HI Lib

[PATCH 0/3] BMC USBNIC Platform HI Lib

[Chang, Abner]

From: Abner Chang <abner.chang@amd.com>

BZ #: 4282
Implement the platform Redfish host interface library that
uses IPMI commands to get the network information of
BMC-exposed USB NIC for building up the SMBIOS type 42
record.

The prerequisites: BZ #4213, 4214 and 4231

Check "Platform with BMC and the BMC-Exposed USB Network Device"
section in readme.md for the design of implementation.

PR: https://github.com/tianocore/edk2/pull/4101

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>

Abner Chang (3):
  RedfishPkg/Library: Redfish BMC USBNIC Host Interface
  RedfishPkg: Update Redfish DSC
  RedfishPkg: Update Readme.md

 RedfishPkg/RedfishPkg.dec                     |   10 +
 RedfishPkg/RedfishPkg.dsc                     |    7 +
 .../PlatformHostInterfaceBmcUsbNicLib.inf     |   48 +
 RedfishPkg/Include/Library/RedfishDebugLib.h  |    3 +-
 .../PlatformHostInterfaceBmcUsbNicLib.h       |   84 ++
 .../PlatformHostInterfaceBmcUsbNicLib.c       | 1280 +++++++++++++++++
 RedfishPkg/Readme.md                          |  112 +-
 .../Documents/Media/BmcExposedUsbNic.svg      |  283 ++++
 .../Media/EmualtorPlatformLibrary.svg         |  286 ++++
 .../Media/PlatformWihtBmcLibrary.svg          |  328 +++++
 10 files changed, 2432 insertions(+), 9 deletions(-)
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c
 create mode 100644 RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
 create mode 100644 RedfishPkg/Documents/Media/EmualtorPlatformLibrary.svg
 create mode 100644 RedfishPkg/Documents/Media/PlatformWihtBmcLibrary.svg

-- 
2.37.1.windows.1

[PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host Interface

[Chang, Abner]

From: Abner Chang <abner.chang@amd.com>

BMC exposed USB NIC platform Redfish Host Interface
library implementation.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/RedfishPkg.dec                     |   10 +
 .../PlatformHostInterfaceBmcUsbNicLib.inf     |   48 +
 RedfishPkg/Include/Library/RedfishDebugLib.h  |    3 +-
 .../PlatformHostInterfaceBmcUsbNicLib.h       |   84 ++
 .../PlatformHostInterfaceBmcUsbNicLib.c       | 1280 +++++++++++++++++
 5 files changed, 1424 insertions(+), 1 deletion(-)
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c

diff --git a/RedfishPkg/RedfishPkg.dec b/RedfishPkg/RedfishPkg.dec
index 53e52c2b008..251aa5e2b76 100644
--- a/RedfishPkg/RedfishPkg.dec
+++ b/RedfishPkg/RedfishPkg.dec
@@ -113,3 +113,13 @@
   # Default is set to not add.
   #
   gEfiRedfishPkgTokenSpaceGuid.PcdRedfishRestExAddingExpect|FALSE|BOOLEAN|0x00001004
+  #
+  # Use PCD to declare the Redfish host nmae becasue there is no
+  # specification for that.
+  #
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName|""|VOID*|0x00001005
+  #
+  # Use PCD to declare the Redfish service UUID becasue there is no
+  # specification for that.
+  #
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid|L""|VOID*|0x00001006
diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
new file mode 100644
index 00000000000..f2c7d7fec89
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
@@ -0,0 +1,48 @@
+## @file
+#  Module to provide the platform Redfish Host Interface information
+#  of USB NIC Device exposed by BMC.
+#
+# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001000b
+  BASE_NAME                      = PlatformHostInterfaceBmcUsbNicLib
+  FILE_GUID                      = C4837B58-225E-4352-8FDC-4C52A5D65891
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PlatformHostInterfaceBmcUsbNicLib
+
+[Sources]
+  PlatformHostInterfaceBmcUsbNicLib.c
+  PlatformHostInterfaceBmcUsbNicLib.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  NetworkPkg/NetworkPkg.dec
+  RedfishPkg/RedfishPkg.dec
+
+[LibraryClasses]
+  BaseMemoryLib
+  DebugLib
+  IpmiLib
+  IpmiCommandLib
+  MemoryAllocationLib
+  UefiLib
+  UefiBootServicesTableLib
+
+[Protocols]
+  gEfiSimpleNetworkProtocolGuid                 ## CONSUMED
+  gEfiUsbIoProtocolGuid                         ## CONSUMED
+  gEfiDevicePathProtocolGuid                    ## CONSUMED
+
+[Pcd]
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName     ## CONSUMED
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid  ## CONSUMED
+
+[Depex]
+  gIpmiProtocolGuid
diff --git a/RedfishPkg/Include/Library/RedfishDebugLib.h b/RedfishPkg/Include/Library/RedfishDebugLib.h
index 21f01353ede..913f2b2f358 100644
--- a/RedfishPkg/Include/Library/RedfishDebugLib.h
+++ b/RedfishPkg/Include/Library/RedfishDebugLib.h
@@ -14,7 +14,8 @@
 #include <Library/JsonLib.h>
 #include <Library/RedfishLib.h>
 
-#define DEBUG_REDFISH_NETWORK  DEBUG_INFO   ///< Debug error level for Redfish networking function
+#define DEBUG_REDFISH_NETWORK         DEBUG_INFO   ///< Debug error level for Redfish networking function
+#define DEBUG_REDFISH_HOST_INTERFACE  DEBUG_INFO   ///< Debug error level for Redfish networking function
 
 /**
 
diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
new file mode 100644
index 00000000000..669c304fc3d
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
@@ -0,0 +1,84 @@
+/** @file
+  Header file to provide the platform Redfish Host Interface information
+  of USB NIC Device exposed by BMC.
+
+  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
+#define PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
+
+#include <Uefi.h>
+#include <IndustryStandard/Ipmi.h>
+#include <IndustryStandard/IpmiNetFnApp.h>
+#include <IndustryStandard/IpmiNetFnTransport.h>
+#include <IndustryStandard/RedfishHostInterfaceIpmi.h>
+#include <IndustryStandard/SmBios.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/IpmiLib.h>
+#include <Library/IpmiCommandLib.h>
+#include <Library/RedfishHostInterfaceLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/RedfishDebugLib.h>
+
+#include <Protocol/SimpleNetwork.h>
+#include <Protocol/UsbIo.h>
+
+#define BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID \
+    {  \
+      0xDD96F5D7, 0x4AE1, 0x4E6C, {0xA1, 0x30, 0xA5, 0xAC, 0x77, 0xDD, 0xE4, 0xA5} \
+    }
+
+//
+// This is the structure for BMC exposed
+// USB NIC information.
+//
+typedef struct {
+  LIST_ENTRY                     NextInstance;              ///< Link to the next instance.
+  BOOLEAN                        IsExposedByBmc;            ///< Flag indicates this USB NIC is
+                                                            ///< exposed by BMC.
+  BOOLEAN                        IsSuppportedHostInterface; ///< This BMC USB NIC is supported
+                                                            ///< as Redfish host interface
+  EFI_SIMPLE_NETWORK_PROTOCOL    *ThisSnp;                  ///< The SNP instance associated with
+                                                            ///< this USB NIC.
+  EFI_USB_IO_PROTOCOL            *ThisUsbIo;                ///< The USBIO instance associated with
+                                                            ///< this USB NIC.
+  UINT16                         UsbVendorId;               ///< USB Vendor ID of this BMC exposed USB NIC.
+  UINT16                         UsbProductId;              ///< USB Product ID of this BMC exposed USB NIC.
+  UINTN                          MacAddressSize;            ///< HW address size.
+  UINT8                          *MacAddress;               ///< HW address.
+  UINT8                          IpmiLanChannelNumber;      ///< BMC IPMI Lan Channel number.
+
+  //
+  // Below is the infortmation for building SMBIOS type 42.
+  //
+  UINT8                          IpAssignedType;          ///< Redfish service IP assign type.
+  UINT8                          IpAddressFormat;         ///< Redfish service IP version.
+  UINT8                          HostIpAddressIpv4[4];    ///< Host IP address.
+  UINT8                          RedfishIpAddressIpv4[4]; ///< Redfish service IP address.
+  UINT8                          SubnetMaskIpv4[4];       ///< Subnet mask.
+  UINT8                          GatewayIpv4[4];          ///< Gateway IP address.
+  UINT16                         VLanId;                  ///< VLAN ID.
+  BOOLEAN                        CredentialBootstrapping; ///< If Credential bootstrapping is
+                                                          ///< supported.
+} HOST_INTERFACE_BMC_USB_NIC_INFO;
+
+//
+// This is the structure for caching
+// BMC IPMI LAN Channel
+//
+typedef struct {
+  LIST_ENTRY         NextInstance;            ///< Link to the next IPMI LAN Channel.
+  UINT8              Channel;                 ///< IPMI Channel number.
+  EFI_MAC_ADDRESS    MacAddress;              ///< IPMI LAN Channel MAC address.
+  UINT8              MacAddressSize;          ///< MAC address size;
+} BMC_IPMI_LAN_CHANNEL_INFO;
+#endif
diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c
new file mode 100644
index 00000000000..1c530b692e8
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c
@@ -0,0 +1,1280 @@
+/** @file
+  Source file to provide the platform Redfish Host Interface information
+  of USB NIC Device exposed by BMC.
+
+  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "PlatformHostInterfaceBmcUsbNicLib.h"
+
+static EFI_GUID  mPlatformHostInterfaceBmcUsbNicReadinessGuid =
+  BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID;
+static EFI_EVENT  mPlatformHostInterfaceSnpEvent         = NULL;
+static VOID       *mPlatformHostInterfaceSnpRegistration = NULL;
+
+static LIST_ENTRY  mBmcUsbNic;
+static LIST_ENTRY  mBmcIpmiLan;
+
+/**
+  Probe if the system supports Redfish Host Interface Credentail
+  Bootstrapping.
+
+  @retval TRUE   Yes, it is supported.
+          TRUE   No, it is not supported.
+
+**/
+BOOLEAN
+ProbeRedfishCredentialBootstrap (
+  VOID
+  )
+{
+  EFI_STATUS                                  Status;
+  IPMI_BOOTSTRAP_CREDENTIALS_COMMAND_DATA     CommandData;
+  IPMI_BOOTSTRAP_CREDENTIALS_RESULT_RESPONSE  ResponseData;
+  UINT32                                      ResponseSize;
+  BOOLEAN                                     ReturnBool;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  //
+  // IPMI callout to NetFn 2C, command 02
+  //    Request data:
+  //      Byte 1: REDFISH_IPMI_GROUP_EXTENSION
+  //      Byte 2: DisableBootstrapControl
+  //
+  CommandData.GroupExtensionId        = REDFISH_IPMI_GROUP_EXTENSION;
+  CommandData.DisableBootstrapControl = REDFISH_IPMI_BOOTSTRAP_CREDENTIAL_ENABLE;
+  ResponseData.CompletionCode         = IPMI_COMP_CODE_UNSPECIFIED;
+  ResponseSize                        = sizeof (ResponseData);
+  //
+  //  Response data: Ignored.
+  //
+  Status = IpmiSubmitCommand (
+             IPMI_NETFN_GROUP_EXT,
+             REDFISH_IPMI_GET_BOOTSTRAP_CREDENTIALS_CMD,
+             (UINT8 *)&CommandData,
+             sizeof (CommandData),
+             (UINT8 *)&ResponseData,
+             &ResponseSize
+             );
+  if (!EFI_ERROR (Status) &&
+      ((ResponseData.CompletionCode == IPMI_COMP_CODE_NORMAL) ||
+       (ResponseData.CompletionCode == REDFISH_IPMI_COMP_CODE_BOOTSTRAP_CREDENTIAL_DISABLED)
+      ))
+  {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail Bootstrapping is supported\n", __FUNCTION__));
+    ReturnBool = TRUE;
+  } else {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail Bootstrapping is not supported\n", __FUNCTION__));
+    ReturnBool = FALSE;
+  }
+
+  return ReturnBool;
+}
+
+/**
+  Get platform Redfish host interface device descriptor.
+
+  @param[in] DeviceType         Pointer to retrieve device type.
+  @param[out] DeviceDescriptor  Pointer to retrieve REDFISH_INTERFACE_DATA, caller has to free
+                                this memory using FreePool().
+
+  @retval EFI_NOT_FOUND   No Redfish host interface descriptor provided on this platform.
+
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceDeviceDescriptor (
+  IN UINT8                    *DeviceType,
+  OUT REDFISH_INTERFACE_DATA  **DeviceDescriptor
+  )
+{
+  HOST_INTERFACE_BMC_USB_NIC_INFO  *ThisInstance;
+  REDFISH_INTERFACE_DATA           *InterfaceData;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic)) {
+    return EFI_NOT_FOUND;
+  }
+
+  // Check if BMC exposed USB NIC is found and ready for using.
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode (&mBmcUsbNic);
+  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc && ThisInstance->IsSuppportedHostInterface) {
+      *DeviceType = REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
+
+      // Fill up REDFISH_INTERFACE_DATA defined in Redfish host interface spec v1.3
+      InterfaceData = (REDFISH_INTERFACE_DATA *)AllocateZeroPool (USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3);
+      if (InterfaceData == NULL) {
+        DEBUG ((DEBUG_ERROR, "Failed to allocate memory for REDFISH_INTERFACE_DATA\n"));
+        return EFI_OUT_OF_RESOURCES;
+      }
+
+      InterfaceData->DeviceType                                   = REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.Length          = USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdVendor        = ThisInstance->UsbVendorId;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdProduct       = ThisInstance->UsbProductId;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.SerialNumberStr = 0;
+      CopyMem (
+        (VOID *)&InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress,
+        (VOID *)&ThisInstance->MacAddress,
+        sizeof (InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress)
+        );
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.Characteristics              |= (UINT16)ThisInstance->CredentialBootstrapping;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.CredentialBootstrappingHandle = 0;
+      *DeviceDescriptor                                                         = InterfaceData;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    REDFISH_INTERFACE_DATA is returned successfully.\n"));
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, &ThisInstance->NextInstance);
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  Get platform Redfish host interface protocol data.
+  Caller should pass NULL in ProtocolRecord to retrive the first protocol record.
+  Then continuously pass previous ProtocolRecord for retrieving the next ProtocolRecord.
+
+  @param[in, out] ProtocolRecord  Pointer to retrieve the first or the next protocol record.
+                                  caller has to free the new protocol record returned from
+                                  this function using FreePool().
+  @param[in] IndexOfProtocolData  The index of protocol data.
+
+  @retval EFI_NOT_FOUND   No more protocol records.
+
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceProtocolData (
+  IN OUT MC_HOST_INTERFACE_PROTOCOL_RECORD  **ProtocolRecord,
+  IN UINT8                                  IndexOfProtocolData
+  )
+{
+  HOST_INTERFACE_BMC_USB_NIC_INFO    *ThisInstance;
+  MC_HOST_INTERFACE_PROTOCOL_RECORD  *ThisProtocolRecord;
+  REDFISH_OVER_IP_PROTOCOL_DATA      *RedfishOverIpData;
+  UINT8                              HostNameLength;
+  CHAR8                              *HostNameString;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic) || (IndexOfProtocolData > 0)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode (&mBmcUsbNic);
+  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc  && ThisInstance->IsSuppportedHostInterface) {
+      // Get the host name before allocating memory.
+      HostNameString     = (CHAR8 *)PcdGetPtr (PcdRedfishHostName);
+      HostNameLength     = (UINT8)AsciiStrSize (HostNameString);
+      ThisProtocolRecord = (MC_HOST_INTERFACE_PROTOCOL_RECORD *)AllocateZeroPool (
+                                                                  sizeof (MC_HOST_INTERFACE_PROTOCOL_RECORD) - 1 +
+                                                                  sizeof (REDFISH_OVER_IP_PROTOCOL_DATA) +
+                                                                  HostNameLength
+                                                                  );
+      if (ThisProtocolRecord == NULL) {
+        DEBUG ((DEBUG_ERROR, "    Aloocate memory fail for MC_HOST_INTERFACE_PROTOCOL_RECORD.\n"));
+        return EFI_OUT_OF_RESOURCES;
+      }
+
+      ThisProtocolRecord->ProtocolType        = MCHostInterfaceProtocolTypeRedfishOverIP;
+      ThisProtocolRecord->ProtocolTypeDataLen = sizeof (REDFISH_OVER_IP_PROTOCOL_DATA) + HostNameLength;
+      RedfishOverIpData                       = (REDFISH_OVER_IP_PROTOCOL_DATA *)&ThisProtocolRecord->ProtocolTypeData[0];
+      //
+      // Fill up REDFISH_OVER_IP_PROTOCOL_DATA
+      //
+
+      // Service UUID
+      ZeroMem ((VOID *)&RedfishOverIpData->ServiceUuid, sizeof (EFI_GUID));
+      if (StrLen ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid)) != 0) {
+        StrToGuid ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid), &RedfishOverIpData->ServiceUuid);
+      }
+
+      // HostIpAddressFormat and RedfishServiceIpDiscoveryType
+      RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentUnknown;
+      RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentUnknown;
+      if (ThisInstance->IpAssignedType == IpmiStaticAddrsss) {
+        RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentStatic;
+        RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentStatic;
+      } else if (ThisInstance->IpAssignedType == IpmiDynamicAddressBmcDhcp) {
+        RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentDhcp;
+        RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentDhcp;
+      }
+
+      // HostIpAddressFormat and RedfishServiceIpAddressFormat, only support IPv4 for now.
+      RedfishOverIpData->HostIpAddressFormat           = REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
+      RedfishOverIpData->RedfishServiceIpAddressFormat = REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
+
+      // HostIpAddress
+      CopyMem (
+        (VOID *)RedfishOverIpData->HostIpAddress,
+        (VOID *)ThisInstance->HostIpAddressIpv4,
+        sizeof (ThisInstance->HostIpAddressIpv4)
+        );
+
+      // HostIpMask and RedfishServiceIpMask
+      CopyMem (
+        (VOID *)RedfishOverIpData->HostIpMask,
+        (VOID *)ThisInstance->SubnetMaskIpv4,
+        sizeof (ThisInstance->SubnetMaskIpv4)
+        );
+      CopyMem (
+        (VOID *)RedfishOverIpData->RedfishServiceIpMask,
+        (VOID *)ThisInstance->SubnetMaskIpv4,
+        sizeof (ThisInstance->SubnetMaskIpv4)
+        );
+
+      // RedfishServiceIpAddress
+      CopyMem (
+        (VOID *)RedfishOverIpData->RedfishServiceIpAddress,
+        (VOID *)ThisInstance->RedfishIpAddressIpv4,
+        sizeof (ThisInstance->RedfishIpAddressIpv4)
+        );
+
+      // RedfishServiceIpPort
+      RedfishOverIpData->RedfishServiceIpPort = 0;
+
+      // RedfishServiceVlanId
+      RedfishOverIpData->RedfishServiceVlanId = ThisInstance->VLanId;
+
+      // RedfishServiceHostnameLength
+      RedfishOverIpData->RedfishServiceHostnameLength = HostNameLength;
+
+      // Redfish host name.
+      CopyMem (
+        (VOID *)&RedfishOverIpData->RedfishServiceHostname,
+        (VOID *)HostNameString,
+        HostNameLength
+        );
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MC_HOST_INTERFACE_PROTOCOL_RECORD is returned successfully.\n"));
+      *ProtocolRecord = ThisProtocolRecord;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, &ThisInstance->NextInstance);
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function retrieve the information of BMC USB NIC.
+
+  @retval EFI_SUCCESS      All necessary information is retrieved.
+  @retval EFI_NOT_FOUND    There is no BMC exposed USB NIC.
+  @retval Others           Other errors.
+
+**/
+EFI_STATUS
+RetrievedBmcUsbNicInfo (
+  VOID
+  )
+{
+  EFI_STATUS                                      Status;
+  UINT32                                          ResponseDataSize;
+  HOST_INTERFACE_BMC_USB_NIC_INFO                 *ThisInstance;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST   GetLanConfigReq;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE  *GetLanConfigReps;
+  IPMI_LAN_IP_ADDRESS_SRC                         *IpAddressSrc;
+  IPMI_LAN_IP_ADDRESS                             *DestIpAddress;
+  IPMI_LAN_SUBNET_MASK                            *SubnetMask;
+  IPMI_LAN_DEFAULT_GATEWAY                        *DefaultGateway;
+  IPMI_LAN_VLAN_ID                                *LanVlanId;
+  EFI_USB_DEVICE_DESCRIPTOR                       UsbDeviceDescriptor;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode (&mBmcUsbNic);
+  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc) {
+      ThisInstance->IsSuppportedHostInterface = FALSE;
+
+      // Probe if Redfish Host Interface Credential Bootstrapping is supported.
+      ThisInstance->CredentialBootstrapping = ProbeRedfishCredentialBootstrap ();
+
+      // Get IP address source
+      GetLanConfigReq.SetSelector                     = 0;
+      GetLanConfigReq.BlockSelector                   = 0;
+      GetLanConfigReq.ChannelNumber.Bits.ChannelNo    = ThisInstance->IpmiLanChannelNumber;
+      GetLanConfigReq.ChannelNumber.Bits.GetParameter = 0;
+      GetLanConfigReq.ChannelNumber.Bits.Reserved     = 0;
+      GetLanConfigReq.ParameterSelector               = IpmiLanIpAddressSource;
+      ResponseDataSize                                = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_IP_ADDRESS_SRC);
+      GetLanConfigReps                                = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode                = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                                          = IpmiGetLanConfigurationParameters (
+                                                          &GetLanConfigReq,
+                                                          GetLanConfigReps,
+                                                          &ResponseDataSize
+                                                          );
+      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get IP address source at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      IpAddressSrc = (IPMI_LAN_IP_ADDRESS_SRC *)(GetLanConfigReps + 1);
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    IP address source at channel %d: %x\n", ThisInstance->IpmiLanChannelNumber, IpAddressSrc->Bits.AddressSrc));
+      ThisInstance->IpAssignedType = IpAddressSrc->Bits.AddressSrc;
+      FreePool (GetLanConfigReps);
+
+      // Get LAN IPv4 IP address
+      GetLanConfigReq.ParameterSelector = IpmiLanIpAddress;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_IP_ADDRESS);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get Dest IP address at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      DestIpAddress = (IPMI_LAN_IP_ADDRESS *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Dest IP address at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        DestIpAddress->IpAddress[0],
+        DestIpAddress->IpAddress[1],
+        DestIpAddress->IpAddress[2],
+        DestIpAddress->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->RedfishIpAddressIpv4, (VOID *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
+      //
+      // According to UEFI spec, the IP address at BMC USB NIC host end is the IP address at BMC end minus 1.
+      //
+      CopyMem ((VOID *)&ThisInstance->HostIpAddressIpv4, (VOID *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
+      ThisInstance->HostIpAddressIpv4[sizeof (ThisInstance->HostIpAddressIpv4) - 1] -= 1;
+      FreePool (GetLanConfigReps);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Host IP address at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        ThisInstance->HostIpAddressIpv4[0],
+        ThisInstance->HostIpAddressIpv4[1],
+        ThisInstance->HostIpAddressIpv4[2],
+        ThisInstance->HostIpAddressIpv4[3]
+        ));
+
+      // Get IPv4 subnet mask
+      GetLanConfigReq.ParameterSelector = IpmiLanSubnetMask;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_SUBNET_MASK);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get subnet mask at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      SubnetMask = (IPMI_LAN_SUBNET_MASK *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Subnet mask at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        SubnetMask->IpAddress[0],
+        SubnetMask->IpAddress[1],
+        SubnetMask->IpAddress[2],
+        SubnetMask->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->SubnetMaskIpv4, (VOID *)&SubnetMask->IpAddress, sizeof (SubnetMask->IpAddress));
+      FreePool (GetLanConfigReps);
+
+      // Get Gateway IP address.
+      GetLanConfigReq.ParameterSelector = IpmiLanDefaultGateway;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_DEFAULT_GATEWAY);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get default gateway at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      DefaultGateway = (IPMI_LAN_DEFAULT_GATEWAY *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Gateway at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        DefaultGateway->IpAddress[0],
+        DefaultGateway->IpAddress[1],
+        DefaultGateway->IpAddress[2],
+        DefaultGateway->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->GatewayIpv4, (VOID *)&DefaultGateway->IpAddress, sizeof (DefaultGateway->IpAddress));
+      FreePool (GetLanConfigReps);
+
+      // Get VLAN ID
+      GetLanConfigReq.ParameterSelector = IpmiLanVlanId;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_VLAN_ID);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get VLAN ID at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      LanVlanId            = (IPMI_LAN_VLAN_ID *)(GetLanConfigReps + 1);
+      ThisInstance->VLanId = 0;
+      if (LanVlanId->Data2.Bits.Enabled == 1) {
+        ThisInstance->VLanId = LanVlanId->Data1.VanIdLowByte | (LanVlanId->Data2.Bits.VanIdHighByte << 8);
+      }
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    VLAN ID %x\n", ThisInstance->VLanId));
+
+      FreePool (GetLanConfigReps);
+
+      //
+      // Read USB device information.
+      //
+      if (ThisInstance->ThisUsbIo != NULL) {
+        Status = ThisInstance->ThisUsbIo->UsbGetDeviceDescriptor (ThisInstance->ThisUsbIo, &UsbDeviceDescriptor);
+        if (!EFI_ERROR (Status)) {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    USB NIC Vendor ID: 0x%04x, Device ID: 0x%04x\n", UsbDeviceDescriptor.IdVendor, UsbDeviceDescriptor.IdProduct));
+          ThisInstance->UsbVendorId  = UsbDeviceDescriptor.IdVendor;
+          ThisInstance->UsbProductId = UsbDeviceDescriptor.IdProduct;
+        } else {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Fail to get USB device descriptor.\n"));
+        }
+      }
+
+      // All information is retrieved.
+      ThisInstance->IsSuppportedHostInterface = TRUE;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, &ThisInstance->NextInstance);
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function caches the found IPMI LAN channel. So we
+  don't have to sedn IPMI commands again if the USB NIC is
+  connected later.
+
+  @param[in] ChannelNum                The IPMI channel number.
+  @param[in] IpmiLanChannelMacAddress  Pointer to EFI_MAC_ADDRESS.
+  @param[in] IpmiLanMacAddressSize     The MAC address size.
+
+  @retval EFI_SUCCESS          IPMI LAN channel is cached.
+  @retval EFI_OUT_OF_RESOURCE  Memory allocated failed.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CacheIpmiLanMac (
+  IN UINT8            ChannelNum,
+  IN EFI_MAC_ADDRESS  *IpmiLanChannelMacAddress,
+  IN UINT8            IpmiLanMacAddressSize
+  )
+{
+  BMC_IPMI_LAN_CHANNEL_INFO  *ChannelInfo;
+
+  ChannelInfo = (BMC_IPMI_LAN_CHANNEL_INFO *)AllocateZeroPool (sizeof (BMC_IPMI_LAN_CHANNEL_INFO));
+  if (ChannelInfo == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  ChannelInfo->Channel = ChannelNum;
+  CopyMem ((VOID *)&ChannelInfo->MacAddress.Addr, (VOID *)IpmiLanChannelMacAddress->Addr, IpmiLanMacAddressSize);
+  ChannelInfo->MacAddressSize = IpmiLanMacAddressSize;
+  InitializeListHead (&ChannelInfo->NextInstance);
+  InsertTailList (&mBmcIpmiLan, &ChannelInfo->NextInstance);
+  return EFI_SUCCESS;
+}
+
+/**
+  This function checks if the IPMI channel already identified
+  previously.
+
+  @param[in]  ChannelNum            The IPMI channel number.
+  @param[out] CachedIpmiLanChannel  Pointer to retrieve the cached
+                                    BMC_IPMI_LAN_CHANNEL_INFO.
+
+  @retval EFI_SUCCESS          IPMI LAN channel is found.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckCachedIpmiLanMac (
+  IN UINT8                       ChannelNum,
+  OUT BMC_IPMI_LAN_CHANNEL_INFO  **CachedIpmiLanChannel
+  )
+{
+  BMC_IPMI_LAN_CHANNEL_INFO  *ThisInstance;
+
+  if (IsListEmpty (&mBmcIpmiLan)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)GetFirstNode (&mBmcIpmiLan);
+  while (TRUE) {
+    if (ThisInstance->Channel == ChannelNum) {
+      *CachedIpmiLanChannel = ThisInstance;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcIpmiLan, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)
+                   GetNextNode (&mBmcIpmiLan, &ThisInstance->NextInstance);
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function goes through IPMI channels to find the
+  mactched MAC addrss of BMC USB NIC endpoint.
+
+  @param[in] UsbNicInfo  The instance of HOST_INTERFACE_BMC_USB_NIC_INFO.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+HostInterfaceIpmiCheckMacAddress (
+  IN HOST_INTERFACE_BMC_USB_NIC_INFO  *UsbNicInfo
+  )
+{
+  EFI_STATUS                                      Status;
+  EFI_STATUS                                      ExitStatus;
+  UINTN                                           ChannelNum;
+  UINT32                                          ResponseDataSize;
+  IPMI_GET_CHANNEL_INFO_REQUEST                   GetChanelInfoRequest;
+  IPMI_GET_CHANNEL_INFO_RESPONSE                  GetChanelInfoResponse;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST   GetLanConfigReq;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE  *GetLanConfigReps;
+  BMC_IPMI_LAN_CHANNEL_INFO                       *CachedIpmiLanChannel;
+  UINT8                                           IpmiLanMacAddressSize;
+  EFI_MAC_ADDRESS                                 IpmiLanChannelMacAddress;
+  BOOLEAN                                         AlreadyCached;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+
+  GetLanConfigReps = NULL;
+  AlreadyCached    = FALSE;
+  if (!IsListEmpty (&mBmcIpmiLan)) {
+    AlreadyCached = TRUE;
+  }
+
+  // Initial the get MAC address request.
+  GetLanConfigReq.SetSelector       = 0;
+  GetLanConfigReq.BlockSelector     = 0;
+  GetLanConfigReq.ParameterSelector = IpmiLanMacAddress;
+
+  ExitStatus = EFI_NOT_FOUND;
+  for (ChannelNum = IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_1;
+       ChannelNum <= IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_11;
+       ChannelNum++)
+  {
+    IpmiLanMacAddressSize = 0;
+
+    // Check if the IPMI channel information is already cached.
+    Status = EFI_NOT_FOUND;
+    if (AlreadyCached) {
+      Status = CheckCachedIpmiLanMac ((UINT8)ChannelNum, &CachedIpmiLanChannel);
+    }
+
+    if (Status == EFI_SUCCESS) {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Got cached IPMI LAN info.\n"));
+      IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
+      CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID *)&CachedIpmiLanChannel->MacAddress.Addr, IpmiLanMacAddressSize);
+    } else {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  No cached IPMI LAN info\n"));
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Send NetFn = App, Command = 0x42 to channel %d\n", ChannelNum));
+      GetChanelInfoRequest.ChannelNumber.Bits.ChannelNo = (UINT8)ChannelNum;
+      Status                                            = IpmiGetChannelInfo (
+                                                            &GetChanelInfoRequest,
+                                                            &GetChanelInfoResponse,
+                                                            &ResponseDataSize
+                                                            );
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "    - Fails to send command.\n", ChannelNum));
+        continue;
+      }
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Response data size = 0x%x\n", ResponseDataSize));
+      if ((GetChanelInfoResponse.CompletionCode != IPMI_COMP_CODE_NORMAL) || (ResponseDataSize == 0)) {
+        DEBUG ((DEBUG_ERROR, "    - Command returned fail: 0x%x.\n", GetChanelInfoResponse.CompletionCode));
+        continue;
+      }
+
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    - Channel protocol = 0x%x, Media = 0x%x\n",
+        GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType,
+        GetChanelInfoResponse.MediumType.Bits.ChannelMediumType
+        ));
+
+      if (GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo != ChannelNum) {
+        DEBUG ((
+          DEBUG_ERROR,
+          "    - ChannelNumber = %d in the response which is not macthed to the request.\n",
+          GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo
+          ));
+        continue;
+      }
+
+      if ((GetChanelInfoResponse.MediumType.Bits.ChannelMediumType == IPMI_CHANNEL_MEDIA_TYPE_802_3_LAN) &&
+          (GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType == IPMI_CHANNEL_PROTOCOL_TYPE_IPMB_1_0))
+      {
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Channel %d is a LAN device!\n", ChannelNum));
+
+        ResponseDataSize = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) +
+                           sizeof (IPMI_LAN_MAC_ADDRESS);
+        if (GetLanConfigReps == NULL) {
+          GetLanConfigReps =
+            (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+          if (GetLanConfigReps == NULL) {
+            DEBUG ((DEBUG_ERROR, "    Allocate memory failed for getting MAC address.\n"));
+            continue;
+          }
+        }
+
+        GetLanConfigReq.ChannelNumber.Bits.ChannelNo = (UINT8)ChannelNum;
+        GetLanConfigReps->CompletionCode             = IPMI_COMP_CODE_UNSPECIFIED;
+        Status                                       = IpmiGetLanConfigurationParameters (
+                                                         &GetLanConfigReq,
+                                                         GetLanConfigReps,
+                                                         &ResponseDataSize
+                                                         );
+        if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+          DEBUG ((
+            DEBUG_ERROR,
+            "    Fails to get MAC address of channel %d, CompletionCode = %02x.\n",
+            ChannelNum,
+            GetLanConfigReps->CompletionCode
+            ));
+          continue;
+        } else {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    The MAC address of channel %d.\n", ChannelNum));
+          DEBUG ((
+            DEBUG_REDFISH_HOST_INTERFACE,
+            "      %02x:%02x:%02x:%02x:%02x:%02x\n",
+            *((UINT8 *)(GetLanConfigReps + 1) + 0),
+            *((UINT8 *)(GetLanConfigReps + 1) + 1),
+            *((UINT8 *)(GetLanConfigReps + 1) + 2),
+            *((UINT8 *)(GetLanConfigReps + 1) + 3),
+            *((UINT8 *)(GetLanConfigReps + 1) + 4),
+            *((UINT8 *)(GetLanConfigReps + 1) + 5)
+            ));
+          IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
+          CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID *)(GetLanConfigReps + 1), IpmiLanMacAddressSize);
+        }
+      }
+    }
+
+    if (IpmiLanMacAddressSize != 0) {
+      if (!AlreadyCached) {
+        // Cache this IPMI LAN channel.
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Cache this IPMI LAN channel.\n"));
+        CacheIpmiLanMac ((UINT8)ChannelNum, &IpmiLanChannelMacAddress, IpmiLanMacAddressSize);
+      }
+
+      //
+      // According to design spec in Readme file under RedfishPkg.
+      // Compare the first five MAC address and
+      // the 6th MAC address.
+      //
+      if ((IpmiLanMacAddressSize != UsbNicInfo->MacAddressSize) ||
+          (CompareMem (
+             (VOID *)UsbNicInfo->MacAddress,
+             (VOID *)&IpmiLanChannelMacAddress.Addr,
+             IpmiLanMacAddressSize - 1
+             ) != 0) ||
+          (IpmiLanChannelMacAddress.Addr[IpmiLanMacAddressSize - 1] !=
+           *(UsbNicInfo->MacAddress + IpmiLanMacAddressSize - 1) - 1)
+          )
+      {
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is not matched.\n"));
+        continue;
+      }
+
+      // This is the NIC exposed by BMC.
+      UsbNicInfo->IpmiLanChannelNumber = (UINT8)ChannelNum;
+      UsbNicInfo->IsExposedByBmc       = TRUE;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is matched.\n"));
+      ExitStatus = EFI_SUCCESS;
+      break;
+    }
+  }
+
+  if (GetLanConfigReps != NULL) {
+    FreePool (GetLanConfigReps);
+  }
+
+  return ExitStatus;
+}
+
+/**
+  This function searches the next MSG_USB_DP device path node.
+
+  @param[in]  ThisDevicePath    Device path to search.
+
+  @retval NULL          MSG_USB_DP is not found.
+          Otherwise     MSG_USB_DP is found.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+UsbNicGetNextMsgUsbDp (
+  IN EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath
+  )
+{
+  if (ThisDevicePath == NULL) {
+    return NULL;
+  }
+
+  while (TRUE) {
+    ThisDevicePath = NextDevicePathNode (ThisDevicePath);
+    if (IsDevicePathEnd (ThisDevicePath)) {
+      return NULL;
+    }
+
+    if ((ThisDevicePath->Type == MESSAGING_DEVICE_PATH) && (ThisDevicePath->SubType == MSG_USB_DP)) {
+      return ThisDevicePath;
+    }
+  }
+
+  return NULL;
+}
+
+/**
+  This function search the UsbIo handle that matches the UsbDevicePath.
+
+  @param[in]  UsbDevicePath    Device path of this SNP handle.
+  @param[out] UsbIo            Return the UsbIo protocol.
+
+  @retval EFI_SUCCESS          Yes, UsbIo protocl is found.
+  @retval EFI_NOT_FOUND        No, UsbIo protocl is not found
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+UsbNicSearchUsbIo (
+  IN   EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath,
+  OUT  EFI_USB_IO_PROTOCOL       **UsbIo
+  )
+{
+  EFI_STATUS                Status;
+  UINTN                     BufferSize;
+  EFI_HANDLE                *HandleBuffer;
+  UINT16                    Length;
+  UINTN                     Index;
+  CHAR16                    *DevicePathStr;
+  EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePathEnd;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePathEnd;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on the EFI handle which has UsbIo and SNP instaleld on it.\n"));
+  DevicePathStr = ConvertDevicePathToText (UsbDevicePath, FALSE, FALSE);
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));
+  FreePool (DevicePathStr);
+
+  BufferSize   = 0;
+  HandleBuffer = NULL;
+  *UsbIo       = NULL;
+  Status       = gBS->LocateHandle (
+                        ByProtocol,
+                        &gEfiUsbIoProtocolGuid,
+                        NULL,
+                        &BufferSize,
+                        NULL
+                        );
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  %d UsbIo protocol instances.\n", BufferSize/sizeof (EFI_HANDLE)));
+    HandleBuffer = AllocateZeroPool (BufferSize);
+    if (HandleBuffer == NULL) {
+      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the handles.\n"));
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gBS->LocateHandle (
+                    ByProtocol,
+                    &gEfiUsbIoProtocolGuid,
+                    NULL,
+                    &BufferSize,
+                    HandleBuffer
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "  Falied to locate UsbIo protocol handles.\n"));
+      FreePool (HandleBuffer);
+      return Status;
+    }
+  } else {
+    return Status;
+  }
+
+  for (Index = 0; Index < (BufferSize/sizeof (EFI_HANDLE)); Index++) {
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiDevicePathProtocolGuid,
+                    (VOID **)&ThisDevicePath
+                    );
+    if (EFI_ERROR (Status)) {
+      continue;
+    }
+
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on #%d instance of UsbIo.\n", Index));
+    DevicePathStr = ConvertDevicePathToText (ThisDevicePath, FALSE, FALSE);
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));
+    FreePool (DevicePathStr);
+
+    Status = EFI_NOT_FOUND;
+
+    // Search for the starting MSG_USB_DP node.
+    ThisUsbDevicePath = UsbDevicePath;
+    if ((DevicePathType (ThisUsbDevicePath) != MESSAGING_DEVICE_PATH) ||
+        (DevicePathSubType (ThisUsbDevicePath) != MSG_USB_DP))
+    {
+      ThisUsbDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePath);
+      if (ThisUsbDevicePath == NULL) {
+        continue;
+      }
+    }
+
+    if ((DevicePathType (ThisDevicePath) != MESSAGING_DEVICE_PATH) ||
+        (DevicePathSubType (ThisDevicePath) != MSG_USB_DP))
+    {
+      ThisDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePath);
+      if (ThisDevicePath == NULL) {
+        continue;
+      }
+    }
+
+    // Search for the ending MSG_USB_DP node.
+    ThisDevicePathEnd    = ThisDevicePath;
+    ThisUsbDevicePathEnd = ThisUsbDevicePath;
+    while (TRUE) {
+      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePathEnd);
+      if (TempDevicePath == NULL) {
+        break;
+      }
+
+      ThisDevicePathEnd = TempDevicePath;
+    }
+
+    while (TRUE) {
+      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePathEnd);
+      if (TempDevicePath == NULL) {
+        break;
+      }
+
+      ThisUsbDevicePathEnd = TempDevicePath;
+    }
+
+    // Compare these two device paths
+    Length = (UINT16)((UINTN)(UINT8 *)ThisDevicePathEnd + DevicePathNodeLength (ThisDevicePathEnd) - (UINTN)(UINT8 *)ThisDevicePath);
+    if (Length != ((UINTN)(UINT8 *)ThisUsbDevicePathEnd + DevicePathNodeLength (ThisUsbDevicePathEnd) - (UINTN)(UINT8 *)ThisUsbDevicePath)) {
+      continue;
+    }
+
+    if (CompareMem (
+          (VOID *)ThisDevicePath,
+          (VOID *)ThisUsbDevicePath,
+          Length
+          ) == 0)
+    {
+      Status = EFI_SUCCESS;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "EFI handle with the correct UsbIo is found at #%d instance of UsbIo.\n", Index));
+      break;
+    }
+  }
+
+  if (Status == EFI_SUCCESS) {
+    // Locate UsbIo from this handle.
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiUsbIoProtocolGuid,
+                    (VOID **)UsbIo
+                    );
+    return Status;
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function identifies if the USB NIC is exposed by BMC as
+  the host-BMC channel.
+
+  @param[in] Handle          This is the EFI handle with SNP installed.
+  @param[in] UsbDevicePath   USB device path.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+IdentifyUsbNicBmcChannel (
+  IN EFI_HANDLE                Handle,
+  IN EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath
+  )
+{
+  UINTN                            Index;
+  EFI_STATUS                       Status;
+  EFI_SIMPLE_NETWORK_PROTOCOL      *Snp;
+  EFI_USB_IO_PROTOCOL              *UsbIo;
+  HOST_INTERFACE_BMC_USB_NIC_INFO  *BmcUsbNic;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+  Status = gBS->HandleProtocol (
+                  Handle,
+                  &gEfiSimpleNetworkProtocolGuid,
+                  (VOID **)&Snp
+                  );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "    Failed to locate SNP.\n"));
+    return Status;
+  }
+
+  Status = UsbNicSearchUsbIo (UsbDevicePath, &UsbIo);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "    Failed to find USBIO.\n"));
+    return Status;
+  }
+
+  // Get the MAC address of this SNP instance.
+  BmcUsbNic = AllocateZeroPool (sizeof (HOST_INTERFACE_BMC_USB_NIC_INFO));
+  if (BmcUsbNic == NULL) {
+    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for HOST_INTERFACE_BMC_USB_NIC_INFO.\n"));
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  InitializeListHead (&BmcUsbNic->NextInstance);
+  BmcUsbNic->MacAddressSize = Snp->Mode->HwAddressSize;
+  BmcUsbNic->MacAddress     = AllocateZeroPool (sizeof (BmcUsbNic->MacAddressSize));
+  if (BmcUsbNic->MacAddress == NULL) {
+    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for HW MAC addresss.\n"));
+    FreePool (BmcUsbNic);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  CopyMem (
+    (VOID *)BmcUsbNic->MacAddress,
+    (VOID *)&Snp->Mode->CurrentAddress,
+    BmcUsbNic->MacAddressSize
+    );
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address (in size %d) for this SNP instance:\n      ", BmcUsbNic->MacAddressSize));
+  for (Index = 0; Index < BmcUsbNic->MacAddressSize; Index++) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%02x ", *(BmcUsbNic->MacAddress + Index)));
+  }
+
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "\n"));
+  BmcUsbNic->ThisSnp   = Snp;
+  BmcUsbNic->ThisUsbIo = UsbIo;
+
+  Status = HostInterfaceIpmiCheckMacAddress (BmcUsbNic);
+  if (Status == EFI_SUCCESS) {
+    BmcUsbNic->IsExposedByBmc = TRUE;
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC is found.\n"));
+  } else {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC is not found.\n"));
+  }
+
+  InsertTailList (&mBmcUsbNic, &BmcUsbNic->NextInstance);
+  return Status;
+}
+
+/**
+  This function checks if the USB NIC exposed by BMC
+  on each handle has SNP protocol installed on it.
+
+  @param[in] HandleNumer    Number of handles to check.
+  @param[in] HandleBuffer   Handles buffer.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckBmcUsbNicOnHandles (
+  IN  UINTN       HandleNumer,
+  IN  EFI_HANDLE  *HandleBuffer
+  )
+{
+  UINTN                     Index;
+  EFI_STATUS                Status;
+  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
+  BOOLEAN                   GotOneUsbNIc;
+
+  if ((HandleNumer == 0) || (HandleBuffer == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: Entry, #%d SNP handle\n", __FUNCTION__, HandleNumer));
+
+  GotOneUsbNIc = FALSE;
+  for (Index = 0; Index < HandleNumer; Index++) {
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiDevicePathProtocolGuid,
+                    (VOID **)&DevicePath
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "    Failed to locate SNP on %d handle.\n", __FUNCTION__, Index));
+      continue;
+    }
+
+    // Check if this is an BMC exposed USB NIC device.
+    while (TRUE) {
+      if ((DevicePath->Type == MESSAGING_DEVICE_PATH) && (DevicePath->SubType == MSG_USB_DP)) {
+        Status = IdentifyUsbNicBmcChannel (*(HandleBuffer + Index), DevicePath);
+        if (!EFI_ERROR (Status)) {
+          GotOneUsbNIc = TRUE;
+          break;
+        }
+      }
+
+      DevicePath = NextDevicePathNode (DevicePath);
+      if (IsDevicePathEnd (DevicePath)) {
+        break;
+      }
+    }
+  }
+
+  if (GotOneUsbNIc) {
+    return EFI_SUCCESS;
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function checks if the USB NIC exposed by BMC
+  is already connected.
+
+  @param[in] Registration      Locate SNP protocol from the notification
+                               registeration key.
+                               NULL means locate SNP protocol from the existing
+                               handles.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckBmcUsbNic (
+  VOID  *Registration
+  )
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  Handle;
+  UINTN       BufferSize;
+  EFI_HANDLE  *HandleBuffer;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry, the registration key - 0x%08x.\n", __FUNCTION__, Registration));
+
+  Handle     = NULL;
+  Status     = EFI_SUCCESS;
+  BufferSize = 0;
+
+  Status = gBS->LocateHandle (
+                  Registration == NULL ? ByProtocol : ByRegisterNotify,
+                  &gEfiSimpleNetworkProtocolGuid,
+                  Registration,
+                  &BufferSize,
+                  NULL
+                  );
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    %d SNP protocol instances.\n", BufferSize/sizeof (EFI_HANDLE)));
+    HandleBuffer = AllocateZeroPool (BufferSize);
+    if (HandleBuffer == NULL) {
+      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the handles.\n"));
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gBS->LocateHandle (
+                    Registration == NULL ? ByProtocol : ByRegisterNotify,
+                    &gEfiSimpleNetworkProtocolGuid,
+                    Registration,
+                    &BufferSize,
+                    HandleBuffer
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "    Falied to locate SNP protocol handles.\n"));
+      FreePool (HandleBuffer);
+      return Status;
+    }
+  } else if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  // Check USB NIC on handles.
+  Status = CheckBmcUsbNicOnHandles (BufferSize/sizeof (EFI_HANDLE), HandleBuffer);
+  if (!EFI_ERROR (Status)) {
+    // Retrieve the rest of BMC USB NIC information for Redfish over IP information
+    // and USB Network Interface V2.
+    Status = RetrievedBmcUsbNicInfo ();
+    if (!EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Install protocol to notify the platform Redfish Host Interface information is ready.\n"));
+      Status = gBS->InstallProtocolInterface (
+                      &Handle,
+                      &mPlatformHostInterfaceBmcUsbNicReadinessGuid,
+                      EFI_NATIVE_INTERFACE,
+                      NULL
+                      );
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "    Install protocol fail %r.\n", Status));
+      }
+    }
+  }
+
+  FreePool (HandleBuffer);
+  return Status;
+}
+
+/**
+  Notification event of SNP readiness.
+
+  @param[in]  Event                 Event whose notification function is being invoked.
+  @param[in]  Context               The pointer to the notification function's context,
+                                    which is implementation-dependent.
+
+**/
+VOID
+EFIAPI
+PlatformHostInterfaceSnpCallback (
+  IN  EFI_EVENT  Event,
+  IN  VOID       *Context
+  )
+{
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+
+  CheckBmcUsbNic (mPlatformHostInterfaceSnpRegistration);
+  return;
+}
+
+/**
+  Get the EFI protocol GUID installed by platform library which
+  indicates the necessary information is ready for building
+  SMBIOS 42h record.
+
+  @param[out] InformationReadinessGuid  Pointer to retrive the protocol
+                                        GUID.
+
+  @retval EFI_SUCCESS          Notification is required for building up
+                               SMBIOS type 42h record.
+  @retval EFI_UNSUPPORTED      Notification is not required for building up
+                               SMBIOS type 42h record.
+  @retval EFI_ALREADY_STARTED  Platform host information is already ready.
+  @retval Others               Other errors.
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceNotification (
+  OUT EFI_GUID  **InformationReadinessGuid
+  )
+{
+  EFI_STATUS  Status;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  *InformationReadinessGuid = NULL;
+  InitializeListHead (&mBmcUsbNic);
+  InitializeListHead (&mBmcIpmiLan);
+
+  //
+  // Check if USB NIC exposed by BMC is already
+  // connected.
+  //
+  Status = CheckBmcUsbNic (NULL);
+  if (!EFI_ERROR (Status)) {
+    return EFI_ALREADY_STARTED;
+  }
+
+  if (Status == EFI_NOT_FOUND) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%a: BMC USB NIC is not found. Register the notification.\n", __FUNCTION__));
+
+    // Register the notification of SNP installation.
+    Status = gBS->CreateEvent (
+                    EVT_NOTIFY_SIGNAL,
+                    TPL_CALLBACK,
+                    PlatformHostInterfaceSnpCallback,
+                    NULL,
+                    &mPlatformHostInterfaceSnpEvent
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Fail to create event for the installation of SNP protocol.", __FUNCTION__));
+      return Status;
+    }
+
+    Status = gBS->RegisterProtocolNotify (
+                    &gEfiSimpleNetworkProtocolGuid,
+                    mPlatformHostInterfaceSnpEvent,
+                    &mPlatformHostInterfaceSnpRegistration
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Fail to register event for the installation of SNP protocol.", __FUNCTION__));
+      return Status;
+    }
+
+    *InformationReadinessGuid = &mPlatformHostInterfaceBmcUsbNicReadinessGuid;
+    return EFI_SUCCESS;
+  }
+
+  DEBUG ((DEBUG_ERROR, "%a: Something wrong when look for BMC USB NIC.\n", __FUNCTION__));
+  return Status;
+}
-- 
2.37.1.windows.1

Re: [PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host Interface

[Nickle Wang]

Please find my comment inline below, thanks!

Regards,
Nickle

-----Original Message-----
From: abner.chang@amd.com <abner.chang@amd.com> 
Sent: Thursday, March 9, 2023 11:41 PM
To: devel@edk2.groups.io
Cc: Nickle Wang <nicklew@nvidia.com>; Igor Kulchytskyy <igork@ami.com>
Subject: [PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host Interface

External email: Use caution opening links or attachments


From: Abner Chang <abner.chang@amd.com>

BMC exposed USB NIC platform Redfish Host Interface library implementation.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/RedfishPkg.dec                     |   10 +
 .../PlatformHostInterfaceBmcUsbNicLib.inf     |   48 +
 RedfishPkg/Include/Library/RedfishDebugLib.h  |    3 +-
 .../PlatformHostInterfaceBmcUsbNicLib.h       |   84 ++
 .../PlatformHostInterfaceBmcUsbNicLib.c       | 1280 +++++++++++++++++
 5 files changed, 1424 insertions(+), 1 deletion(-)  create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
 create mode 100644 RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c

diff --git a/RedfishPkg/RedfishPkg.dec b/RedfishPkg/RedfishPkg.dec index 53e52c2b008..251aa5e2b76 100644
--- a/RedfishPkg/RedfishPkg.dec
+++ b/RedfishPkg/RedfishPkg.dec
@@ -113,3 +113,13 @@
   # Default is set to not add.
   #
   gEfiRedfishPkgTokenSpaceGuid.PcdRedfishRestExAddingExpect|FALSE|BOOLEAN|0x00001004
+  #
+  # Use PCD to declare the Redfish host nmae becasue there is no  # 
+ specification for that.
+  #
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName|""|VOID*|0x00001005
+  #
+  # Use PCD to declare the Redfish service UUID becasue there is no  # 
+ specification for that.
+  #
+  
+ gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid|L""|VOID*|0x0000100
+ 6

Would it be good to provide dummy string for above PCDs? For example:

gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName|"edk2_redfishpkg"|VOID*|0x00001005
gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid|L"0000000000000000"|VOID*|0x0000100

diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
new file mode 100644
index 00000000000..f2c7d7fec89
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
+++ nterfaceBmcUsbNicLib.inf
@@ -0,0 +1,48 @@
+## @file
+#  Module to provide the platform Redfish Host Interface information #  
+of USB NIC Device exposed by BMC.
+#
+# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent # ##
+
+[Defines]
+  INF_VERSION                    = 0x0001000b
+  BASE_NAME                      = PlatformHostInterfaceBmcUsbNicLib
+  FILE_GUID                      = C4837B58-225E-4352-8FDC-4C52A5D65891
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PlatformHostInterfaceBmcUsbNicLib
+
+[Sources]
+  PlatformHostInterfaceBmcUsbNicLib.c
+  PlatformHostInterfaceBmcUsbNicLib.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  NetworkPkg/NetworkPkg.dec
+  RedfishPkg/RedfishPkg.dec
+
+[LibraryClasses]
+  BaseMemoryLib
+  DebugLib
+  IpmiLib
+  IpmiCommandLib
+  MemoryAllocationLib
+  UefiLib
+  UefiBootServicesTableLib
+
+[Protocols]
+  gEfiSimpleNetworkProtocolGuid                 ## CONSUMED
+  gEfiUsbIoProtocolGuid                         ## CONSUMED
+  gEfiDevicePathProtocolGuid                    ## CONSUMED
+
+[Pcd]
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName     ## CONSUMED
+  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid  ## CONSUMED
+
+[Depex]
+  gIpmiProtocolGuid
diff --git a/RedfishPkg/Include/Library/RedfishDebugLib.h b/RedfishPkg/Include/Library/RedfishDebugLib.h
index 21f01353ede..913f2b2f358 100644
--- a/RedfishPkg/Include/Library/RedfishDebugLib.h
+++ b/RedfishPkg/Include/Library/RedfishDebugLib.h
@@ -14,7 +14,8 @@
 #include <Library/JsonLib.h>
 #include <Library/RedfishLib.h>

-#define DEBUG_REDFISH_NETWORK  DEBUG_INFO   ///< Debug error level for Redfish networking function
+#define DEBUG_REDFISH_NETWORK         DEBUG_INFO   ///< Debug error level for Redfish networking function
+#define DEBUG_REDFISH_HOST_INTERFACE  DEBUG_INFO   ///< Debug error level for Redfish networking function

 /**

diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.h
new file mode 100644
index 00000000000..669c304fc3d
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
+++ nterfaceBmcUsbNicLib.h
@@ -0,0 +1,84 @@
+/** @file
+  Header file to provide the platform Redfish Host Interface 
+information
+  of USB NIC Device exposed by BMC.
+
+  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
+#define PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
+
+#include <Uefi.h>
+#include <IndustryStandard/Ipmi.h>
+#include <IndustryStandard/IpmiNetFnApp.h> #include 
+<IndustryStandard/IpmiNetFnTransport.h>
+#include <IndustryStandard/RedfishHostInterfaceIpmi.h>
+#include <IndustryStandard/SmBios.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/IpmiLib.h>
+#include <Library/IpmiCommandLib.h>
+#include <Library/RedfishHostInterfaceLib.h>
+#include <Library/MemoryAllocationLib.h> #include 
+<Library/UefiBootServicesTableLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/RedfishDebugLib.h>
+
+#include <Protocol/SimpleNetwork.h>
+#include <Protocol/UsbIo.h>
+
+#define BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID \
+    {  \
+      0xDD96F5D7, 0x4AE1, 0x4E6C, {0xA1, 0x30, 0xA5, 0xAC, 0x77, 0xDD, 0xE4, 0xA5} \
+    }
+
+//
+// This is the structure for BMC exposed // USB NIC information.
+//
+typedef struct {
+  LIST_ENTRY                     NextInstance;              ///< Link to the next instance.
+  BOOLEAN                        IsExposedByBmc;            ///< Flag indicates this USB NIC is
+                                                            ///< exposed by BMC.
+  BOOLEAN                        IsSuppportedHostInterface; ///< This BMC USB NIC is supported
+                                                            ///< as Redfish host interface
+  EFI_SIMPLE_NETWORK_PROTOCOL    *ThisSnp;                  ///< The SNP instance associated with
+                                                            ///< this USB NIC.
+  EFI_USB_IO_PROTOCOL            *ThisUsbIo;                ///< The USBIO instance associated with
+                                                            ///< this USB NIC.
+  UINT16                         UsbVendorId;               ///< USB Vendor ID of this BMC exposed USB NIC.
+  UINT16                         UsbProductId;              ///< USB Product ID of this BMC exposed USB NIC.
+  UINTN                          MacAddressSize;            ///< HW address size.
+  UINT8                          *MacAddress;               ///< HW address.
+  UINT8                          IpmiLanChannelNumber;      ///< BMC IPMI Lan Channel number.
+
+  //
+  // Below is the infortmation for building SMBIOS type 42.
+  //
+  UINT8                          IpAssignedType;          ///< Redfish service IP assign type.
+  UINT8                          IpAddressFormat;         ///< Redfish service IP version.
+  UINT8                          HostIpAddressIpv4[4];    ///< Host IP address.
+  UINT8                          RedfishIpAddressIpv4[4]; ///< Redfish service IP address.
+  UINT8                          SubnetMaskIpv4[4];       ///< Subnet mask.
+  UINT8                          GatewayIpv4[4];          ///< Gateway IP address.
+  UINT16                         VLanId;                  ///< VLAN ID.
+  BOOLEAN                        CredentialBootstrapping; ///< If Credential bootstrapping is
+                                                          ///< supported.
+} HOST_INTERFACE_BMC_USB_NIC_INFO;
+
+//
+// This is the structure for caching
+// BMC IPMI LAN Channel
+//
+typedef struct {
+  LIST_ENTRY         NextInstance;            ///< Link to the next IPMI LAN Channel.
+  UINT8              Channel;                 ///< IPMI Channel number.
+  EFI_MAC_ADDRESS    MacAddress;              ///< IPMI LAN Channel MAC address.
+  UINT8              MacAddressSize;          ///< MAC address size;
+} BMC_IPMI_LAN_CHANNEL_INFO;
+#endif
diff --git a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.c
new file mode 100644
index 00000000000..1c530b692e8
--- /dev/null
+++ b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
+++ nterfaceBmcUsbNicLib.c
@@ -0,0 +1,1280 @@
+/** @file
+  Source file to provide the platform Redfish Host Interface 
+information
+  of USB NIC Device exposed by BMC.
+
+  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "PlatformHostInterfaceBmcUsbNicLib.h"
+
+static EFI_GUID  mPlatformHostInterfaceBmcUsbNicReadinessGuid =
+  BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID;
+static EFI_EVENT  mPlatformHostInterfaceSnpEvent         = NULL;
+static VOID       *mPlatformHostInterfaceSnpRegistration = NULL;
+
+static LIST_ENTRY  mBmcUsbNic;
+static LIST_ENTRY  mBmcIpmiLan;
+
+/**
+  Probe if the system supports Redfish Host Interface Credentail
+  Bootstrapping.
+
+  @retval TRUE   Yes, it is supported.
+          TRUE   No, it is not supported.
+
+**/
+BOOLEAN
+ProbeRedfishCredentialBootstrap (
+  VOID
+  )
+{
+  EFI_STATUS                                  Status;
+  IPMI_BOOTSTRAP_CREDENTIALS_COMMAND_DATA     CommandData;
+  IPMI_BOOTSTRAP_CREDENTIALS_RESULT_RESPONSE  ResponseData;
+  UINT32                                      ResponseSize;
+  BOOLEAN                                     ReturnBool;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  //
+  // IPMI callout to NetFn 2C, command 02
+  //    Request data:
+  //      Byte 1: REDFISH_IPMI_GROUP_EXTENSION
+  //      Byte 2: DisableBootstrapControl
+  //
+  CommandData.GroupExtensionId        = REDFISH_IPMI_GROUP_EXTENSION;
+  CommandData.DisableBootstrapControl = REDFISH_IPMI_BOOTSTRAP_CREDENTIAL_ENABLE;
+  ResponseData.CompletionCode         = IPMI_COMP_CODE_UNSPECIFIED;
+  ResponseSize                        = sizeof (ResponseData);
+  //
+  //  Response data: Ignored.
+  //
+  Status = IpmiSubmitCommand (
+             IPMI_NETFN_GROUP_EXT,
+             REDFISH_IPMI_GET_BOOTSTRAP_CREDENTIALS_CMD,
+             (UINT8 *)&CommandData,
+             sizeof (CommandData),
+             (UINT8 *)&ResponseData,
+             &ResponseSize
+             );
+  if (!EFI_ERROR (Status) &&
+      ((ResponseData.CompletionCode == IPMI_COMP_CODE_NORMAL) ||
+       (ResponseData.CompletionCode == REDFISH_IPMI_COMP_CODE_BOOTSTRAP_CREDENTIAL_DISABLED)
+      ))
+  {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail Bootstrapping is supported\n", __FUNCTION__));
+    ReturnBool = TRUE;
+  } else {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail Bootstrapping is not supported\n", __FUNCTION__));
+    ReturnBool = FALSE;
+  }
+
+  return ReturnBool;
+}
+
+/**
+  Get platform Redfish host interface device descriptor.
+
+  @param[in] DeviceType         Pointer to retrieve device type.
+  @param[out] DeviceDescriptor  Pointer to retrieve REDFISH_INTERFACE_DATA, caller has to free
+                                this memory using FreePool().
+
+  @retval EFI_NOT_FOUND   No Redfish host interface descriptor provided on this platform.
+
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceDeviceDescriptor (
+  IN UINT8                    *DeviceType,
+  OUT REDFISH_INTERFACE_DATA  **DeviceDescriptor
+  )
+{
+  HOST_INTERFACE_BMC_USB_NIC_INFO  *ThisInstance;
+  REDFISH_INTERFACE_DATA           *InterfaceData;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic)) {
+    return EFI_NOT_FOUND;
+  }
+
+  // Check if BMC exposed USB NIC is found and ready for using.
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode 
+ (&mBmcUsbNic);  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc && ThisInstance->IsSuppportedHostInterface) {
+      *DeviceType = REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
+
+      // Fill up REDFISH_INTERFACE_DATA defined in Redfish host interface spec v1.3
+      InterfaceData = (REDFISH_INTERFACE_DATA *)AllocateZeroPool (USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3);
+      if (InterfaceData == NULL) {
+        DEBUG ((DEBUG_ERROR, "Failed to allocate memory for REDFISH_INTERFACE_DATA\n"));
+        return EFI_OUT_OF_RESOURCES;
+      }
+
+      InterfaceData->DeviceType                                   = REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.Length          = USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdVendor        = ThisInstance->UsbVendorId;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdProduct       = ThisInstance->UsbProductId;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.SerialNumberStr = 0;
+      CopyMem (
+        (VOID *)&InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress,
+        (VOID *)&ThisInstance->MacAddress,
+        sizeof (InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress)
+        );
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.Characteristics              |= (UINT16)ThisInstance->CredentialBootstrapping;
+      InterfaceData->DeviceDescriptor.UsbDeviceV2.CredentialBootstrappingHandle = 0;
+      *DeviceDescriptor                                                         = InterfaceData;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    REDFISH_INTERFACE_DATA is returned successfully.\n"));
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, 
+ &ThisInstance->NextInstance);  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  Get platform Redfish host interface protocol data.
+  Caller should pass NULL in ProtocolRecord to retrive the first protocol record.
+  Then continuously pass previous ProtocolRecord for retrieving the next ProtocolRecord.
+
+  @param[in, out] ProtocolRecord  Pointer to retrieve the first or the next protocol record.
+                                  caller has to free the new protocol record returned from
+                                  this function using FreePool().
+  @param[in] IndexOfProtocolData  The index of protocol data.
+
+  @retval EFI_NOT_FOUND   No more protocol records.
+
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceProtocolData (
+  IN OUT MC_HOST_INTERFACE_PROTOCOL_RECORD  **ProtocolRecord,
+  IN UINT8                                  IndexOfProtocolData
+  )
+{
+  HOST_INTERFACE_BMC_USB_NIC_INFO    *ThisInstance;
+  MC_HOST_INTERFACE_PROTOCOL_RECORD  *ThisProtocolRecord;
+  REDFISH_OVER_IP_PROTOCOL_DATA      *RedfishOverIpData;
+  UINT8                              HostNameLength;
+  CHAR8                              *HostNameString;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic) || (IndexOfProtocolData > 0)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode 
+ (&mBmcUsbNic);  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc  && ThisInstance->IsSuppportedHostInterface) {
+      // Get the host name before allocating memory.
+      HostNameString     = (CHAR8 *)PcdGetPtr (PcdRedfishHostName);
+      HostNameLength     = (UINT8)AsciiStrSize (HostNameString);
+      ThisProtocolRecord = (MC_HOST_INTERFACE_PROTOCOL_RECORD *)AllocateZeroPool (
+                                                                  sizeof (MC_HOST_INTERFACE_PROTOCOL_RECORD) - 1 +
+                                                                  sizeof (REDFISH_OVER_IP_PROTOCOL_DATA) +
+                                                                  HostNameLength
+                                                                  );
+      if (ThisProtocolRecord == NULL) {
+        DEBUG ((DEBUG_ERROR, "    Aloocate memory fail for MC_HOST_INTERFACE_PROTOCOL_RECORD.\n"));
+        return EFI_OUT_OF_RESOURCES;
+      }
+
+      ThisProtocolRecord->ProtocolType        = MCHostInterfaceProtocolTypeRedfishOverIP;
+      ThisProtocolRecord->ProtocolTypeDataLen = sizeof (REDFISH_OVER_IP_PROTOCOL_DATA) + HostNameLength;
+      RedfishOverIpData                       = (REDFISH_OVER_IP_PROTOCOL_DATA *)&ThisProtocolRecord->ProtocolTypeData[0];
+      //
+      // Fill up REDFISH_OVER_IP_PROTOCOL_DATA
+      //
+
+      // Service UUID
+      ZeroMem ((VOID *)&RedfishOverIpData->ServiceUuid, sizeof (EFI_GUID));
+      if (StrLen ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid)) != 0) {
+        StrToGuid ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid), &RedfishOverIpData->ServiceUuid);
+      }
+
+      // HostIpAddressFormat and RedfishServiceIpDiscoveryType
+      RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentUnknown;
+      RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentUnknown;
+      if (ThisInstance->IpAssignedType == IpmiStaticAddrsss) {
+        RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentStatic;
+        RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentStatic;
+      } else if (ThisInstance->IpAssignedType == IpmiDynamicAddressBmcDhcp) {
+        RedfishOverIpData->HostIpAssignmentType          = RedfishHostIpAssignmentDhcp;
+        RedfishOverIpData->RedfishServiceIpDiscoveryType = RedfishHostIpAssignmentDhcp;
+      }
+
+      // HostIpAddressFormat and RedfishServiceIpAddressFormat, only support IPv4 for now.
+      RedfishOverIpData->HostIpAddressFormat           = REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
+      RedfishOverIpData->RedfishServiceIpAddressFormat = 
+ REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
+
+      // HostIpAddress
+      CopyMem (
+        (VOID *)RedfishOverIpData->HostIpAddress,
+        (VOID *)ThisInstance->HostIpAddressIpv4,
+        sizeof (ThisInstance->HostIpAddressIpv4)
+        );
+
+      // HostIpMask and RedfishServiceIpMask
+      CopyMem (
+        (VOID *)RedfishOverIpData->HostIpMask,
+        (VOID *)ThisInstance->SubnetMaskIpv4,
+        sizeof (ThisInstance->SubnetMaskIpv4)
+        );
+      CopyMem (
+        (VOID *)RedfishOverIpData->RedfishServiceIpMask,
+        (VOID *)ThisInstance->SubnetMaskIpv4,
+        sizeof (ThisInstance->SubnetMaskIpv4)
+        );
+
+      // RedfishServiceIpAddress
+      CopyMem (
+        (VOID *)RedfishOverIpData->RedfishServiceIpAddress,
+        (VOID *)ThisInstance->RedfishIpAddressIpv4,
+        sizeof (ThisInstance->RedfishIpAddressIpv4)
+        );
+
+      // RedfishServiceIpPort
+      RedfishOverIpData->RedfishServiceIpPort = 0;
+
+      // RedfishServiceVlanId
+      RedfishOverIpData->RedfishServiceVlanId = ThisInstance->VLanId;
+
+      // RedfishServiceHostnameLength
+      RedfishOverIpData->RedfishServiceHostnameLength = HostNameLength;
+
+      // Redfish host name.
+      CopyMem (
+        (VOID *)&RedfishOverIpData->RedfishServiceHostname,
+        (VOID *)HostNameString,
+        HostNameLength
+        );
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MC_HOST_INTERFACE_PROTOCOL_RECORD is returned successfully.\n"));
+      *ProtocolRecord = ThisProtocolRecord;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, 
+ &ThisInstance->NextInstance);  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function retrieve the information of BMC USB NIC.
+
+  @retval EFI_SUCCESS      All necessary information is retrieved.
+  @retval EFI_NOT_FOUND    There is no BMC exposed USB NIC.
+  @retval Others           Other errors.
+
+**/
+EFI_STATUS
+RetrievedBmcUsbNicInfo (
+  VOID
+  )
+{
+  EFI_STATUS                                      Status;
+  UINT32                                          ResponseDataSize;
+  HOST_INTERFACE_BMC_USB_NIC_INFO                 *ThisInstance;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST   GetLanConfigReq;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE  *GetLanConfigReps;
+  IPMI_LAN_IP_ADDRESS_SRC                         *IpAddressSrc;
+  IPMI_LAN_IP_ADDRESS                             *DestIpAddress;
+  IPMI_LAN_SUBNET_MASK                            *SubnetMask;
+  IPMI_LAN_DEFAULT_GATEWAY                        *DefaultGateway;
+  IPMI_LAN_VLAN_ID                                *LanVlanId;
+  EFI_USB_DEVICE_DESCRIPTOR                       UsbDeviceDescriptor;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  if (IsListEmpty (&mBmcUsbNic)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode 
+ (&mBmcUsbNic);  while (TRUE) {
+    if (ThisInstance->IsExposedByBmc) {
+      ThisInstance->IsSuppportedHostInterface = FALSE;
+
+      // Probe if Redfish Host Interface Credential Bootstrapping is supported.
+      ThisInstance->CredentialBootstrapping = 
+ ProbeRedfishCredentialBootstrap ();
+
+      // Get IP address source
+      GetLanConfigReq.SetSelector                     = 0;
+      GetLanConfigReq.BlockSelector                   = 0;
+      GetLanConfigReq.ChannelNumber.Bits.ChannelNo    = ThisInstance->IpmiLanChannelNumber;
+      GetLanConfigReq.ChannelNumber.Bits.GetParameter = 0;
+      GetLanConfigReq.ChannelNumber.Bits.Reserved     = 0;
+      GetLanConfigReq.ParameterSelector               = IpmiLanIpAddressSource;
+      ResponseDataSize                                = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_IP_ADDRESS_SRC);
+      GetLanConfigReps                                = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode                = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                                          = IpmiGetLanConfigurationParameters (
+                                                          &GetLanConfigReq,
+                                                          GetLanConfigReps,
+                                                          &ResponseDataSize
+                                                          );
+      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get IP address source at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      IpAddressSrc = (IPMI_LAN_IP_ADDRESS_SRC *)(GetLanConfigReps + 1);
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    IP address source at channel %d: %x\n", ThisInstance->IpmiLanChannelNumber, IpAddressSrc->Bits.AddressSrc));
+      ThisInstance->IpAssignedType = IpAddressSrc->Bits.AddressSrc;
+      FreePool (GetLanConfigReps);
+
+      // Get LAN IPv4 IP address
+      GetLanConfigReq.ParameterSelector = IpmiLanIpAddress;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_IP_ADDRESS);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get Dest IP address at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      DestIpAddress = (IPMI_LAN_IP_ADDRESS *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Dest IP address at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        DestIpAddress->IpAddress[0],
+        DestIpAddress->IpAddress[1],
+        DestIpAddress->IpAddress[2],
+        DestIpAddress->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->RedfishIpAddressIpv4, (VOID *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
+      //
+      // According to UEFI spec, the IP address at BMC USB NIC host end is the IP address at BMC end minus 1.
+      //
+      CopyMem ((VOID *)&ThisInstance->HostIpAddressIpv4, (VOID *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
+      ThisInstance->HostIpAddressIpv4[sizeof (ThisInstance->HostIpAddressIpv4) - 1] -= 1;
+      FreePool (GetLanConfigReps);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Host IP address at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        ThisInstance->HostIpAddressIpv4[0],
+        ThisInstance->HostIpAddressIpv4[1],
+        ThisInstance->HostIpAddressIpv4[2],
+        ThisInstance->HostIpAddressIpv4[3]
+        ));
+
+      // Get IPv4 subnet mask
+      GetLanConfigReq.ParameterSelector = IpmiLanSubnetMask;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_SUBNET_MASK);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get subnet mask at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      SubnetMask = (IPMI_LAN_SUBNET_MASK *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Subnet mask at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        SubnetMask->IpAddress[0],
+        SubnetMask->IpAddress[1],
+        SubnetMask->IpAddress[2],
+        SubnetMask->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->SubnetMaskIpv4, (VOID *)&SubnetMask->IpAddress, sizeof (SubnetMask->IpAddress));
+      FreePool (GetLanConfigReps);
+
+      // Get Gateway IP address.
+      GetLanConfigReq.ParameterSelector = IpmiLanDefaultGateway;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_DEFAULT_GATEWAY);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get default gateway at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      DefaultGateway = (IPMI_LAN_DEFAULT_GATEWAY *)(GetLanConfigReps + 1);
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    Gateway at channel %d: %d.%d.%d.%d\n",
+        ThisInstance->IpmiLanChannelNumber,
+        DefaultGateway->IpAddress[0],
+        DefaultGateway->IpAddress[1],
+        DefaultGateway->IpAddress[2],
+        DefaultGateway->IpAddress[3]
+        ));
+      CopyMem ((VOID *)&ThisInstance->GatewayIpv4, (VOID *)&DefaultGateway->IpAddress, sizeof (DefaultGateway->IpAddress));
+      FreePool (GetLanConfigReps);
+
+      // Get VLAN ID
+      GetLanConfigReq.ParameterSelector = IpmiLanVlanId;
+      ResponseDataSize                  = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof (IPMI_LAN_VLAN_ID);
+      GetLanConfigReps                  = (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+      GetLanConfigReps->CompletionCode  = IPMI_COMP_CODE_UNSPECIFIED;
+      Status                            = IpmiGetLanConfigurationParameters (
+                                            &GetLanConfigReq,
+                                            GetLanConfigReps,
+                                            &ResponseDataSize
+                                            );
+      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+        DEBUG ((DEBUG_ERROR, "    Failed to get VLAN ID at channel %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status, GetLanConfigReps->CompletionCode));
+        FreePool (GetLanConfigReps);
+        return Status;
+      }
+
+      LanVlanId            = (IPMI_LAN_VLAN_ID *)(GetLanConfigReps + 1);
+      ThisInstance->VLanId = 0;
+      if (LanVlanId->Data2.Bits.Enabled == 1) {
+        ThisInstance->VLanId = LanVlanId->Data1.VanIdLowByte | (LanVlanId->Data2.Bits.VanIdHighByte << 8);
+      }
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    VLAN ID %x\n", ThisInstance->VLanId));
+
+      FreePool (GetLanConfigReps);
+
+      //
+      // Read USB device information.
+      //
+      if (ThisInstance->ThisUsbIo != NULL) {
+        Status = ThisInstance->ThisUsbIo->UsbGetDeviceDescriptor (ThisInstance->ThisUsbIo, &UsbDeviceDescriptor);
+        if (!EFI_ERROR (Status)) {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    USB NIC Vendor ID: 0x%04x, Device ID: 0x%04x\n", UsbDeviceDescriptor.IdVendor, UsbDeviceDescriptor.IdProduct));
+          ThisInstance->UsbVendorId  = UsbDeviceDescriptor.IdVendor;
+          ThisInstance->UsbProductId = UsbDeviceDescriptor.IdProduct;
+        } else {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Fail to get USB device descriptor.\n"));
+        }
+      }
+
+      // All information is retrieved.
+      ThisInstance->IsSuppportedHostInterface = TRUE;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
+                   GetNextNode (&mBmcUsbNic, 
+ &ThisInstance->NextInstance);  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function caches the found IPMI LAN channel. So we
+  don't have to sedn IPMI commands again if the USB NIC is
+  connected later.
+
+  @param[in] ChannelNum                The IPMI channel number.
+  @param[in] IpmiLanChannelMacAddress  Pointer to EFI_MAC_ADDRESS.
+  @param[in] IpmiLanMacAddressSize     The MAC address size.
+
+  @retval EFI_SUCCESS          IPMI LAN channel is cached.
+  @retval EFI_OUT_OF_RESOURCE  Memory allocated failed.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CacheIpmiLanMac (
+  IN UINT8            ChannelNum,
+  IN EFI_MAC_ADDRESS  *IpmiLanChannelMacAddress,
+  IN UINT8            IpmiLanMacAddressSize
+  )
+{
+  BMC_IPMI_LAN_CHANNEL_INFO  *ChannelInfo;
+
+  ChannelInfo = (BMC_IPMI_LAN_CHANNEL_INFO *)AllocateZeroPool (sizeof 
+ (BMC_IPMI_LAN_CHANNEL_INFO));  if (ChannelInfo == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  ChannelInfo->Channel = ChannelNum;
+  CopyMem ((VOID *)&ChannelInfo->MacAddress.Addr, (VOID 
+*)IpmiLanChannelMacAddress->Addr, IpmiLanMacAddressSize);
+  ChannelInfo->MacAddressSize = IpmiLanMacAddressSize;
+  InitializeListHead (&ChannelInfo->NextInstance);
+  InsertTailList (&mBmcIpmiLan, &ChannelInfo->NextInstance);
+  return EFI_SUCCESS;
+}
+
+/**
+  This function checks if the IPMI channel already identified
+  previously.
+
+  @param[in]  ChannelNum            The IPMI channel number.
+  @param[out] CachedIpmiLanChannel  Pointer to retrieve the cached
+                                    BMC_IPMI_LAN_CHANNEL_INFO.
+
+  @retval EFI_SUCCESS          IPMI LAN channel is found.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckCachedIpmiLanMac (
+  IN UINT8                       ChannelNum,
+  OUT BMC_IPMI_LAN_CHANNEL_INFO  **CachedIpmiLanChannel
+  )
+{
+  BMC_IPMI_LAN_CHANNEL_INFO  *ThisInstance;
+
+  if (IsListEmpty (&mBmcIpmiLan)) {
+    return EFI_NOT_FOUND;
+  }
+
+  ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)GetFirstNode 
+ (&mBmcIpmiLan);  while (TRUE) {
+    if (ThisInstance->Channel == ChannelNum) {
+      *CachedIpmiLanChannel = ThisInstance;
+      return EFI_SUCCESS;
+    }
+
+    if (IsNodeAtEnd (&mBmcIpmiLan, &ThisInstance->NextInstance)) {
+      break;
+    }
+
+    ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)
+                   GetNextNode (&mBmcIpmiLan, 
+ &ThisInstance->NextInstance);  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function goes through IPMI channels to find the
+  mactched MAC addrss of BMC USB NIC endpoint.
+
+  @param[in] UsbNicInfo  The instance of HOST_INTERFACE_BMC_USB_NIC_INFO.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+HostInterfaceIpmiCheckMacAddress (
+  IN HOST_INTERFACE_BMC_USB_NIC_INFO  *UsbNicInfo
+  )
+{
+  EFI_STATUS                                      Status;
+  EFI_STATUS                                      ExitStatus;
+  UINTN                                           ChannelNum;
+  UINT32                                          ResponseDataSize;
+  IPMI_GET_CHANNEL_INFO_REQUEST                   GetChanelInfoRequest;
+  IPMI_GET_CHANNEL_INFO_RESPONSE                  GetChanelInfoResponse;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST   GetLanConfigReq;
+  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE  *GetLanConfigReps;
+  BMC_IPMI_LAN_CHANNEL_INFO                       *CachedIpmiLanChannel;
+  UINT8                                           IpmiLanMacAddressSize;
+  EFI_MAC_ADDRESS                                 IpmiLanChannelMacAddress;
+  BOOLEAN                                         AlreadyCached;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+
+  GetLanConfigReps = NULL;
+  AlreadyCached    = FALSE;
+  if (!IsListEmpty (&mBmcIpmiLan)) {
+    AlreadyCached = TRUE;
+  }
+
+  // Initial the get MAC address request.
+  GetLanConfigReq.SetSelector       = 0;
+  GetLanConfigReq.BlockSelector     = 0;
+  GetLanConfigReq.ParameterSelector = IpmiLanMacAddress;
+
+  ExitStatus = EFI_NOT_FOUND;
+  for (ChannelNum = IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_1;
+       ChannelNum <= IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_11;
+       ChannelNum++)
+  {
+    IpmiLanMacAddressSize = 0;
+
+    // Check if the IPMI channel information is already cached.
+    Status = EFI_NOT_FOUND;
+    if (AlreadyCached) {
+      Status = CheckCachedIpmiLanMac ((UINT8)ChannelNum, &CachedIpmiLanChannel);
+    }
+
+    if (Status == EFI_SUCCESS) {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Got cached IPMI LAN info.\n"));
+      IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
+      CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID *)&CachedIpmiLanChannel->MacAddress.Addr, IpmiLanMacAddressSize);
+    } else {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  No cached IPMI LAN info\n"));
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Send NetFn = App, Command = 0x42 to channel %d\n", ChannelNum));
+      GetChanelInfoRequest.ChannelNumber.Bits.ChannelNo = (UINT8)ChannelNum;
+      Status                                            = IpmiGetChannelInfo (
+                                                            &GetChanelInfoRequest,
+                                                            &GetChanelInfoResponse,
+                                                            &ResponseDataSize
+                                                            );
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "    - Fails to send command.\n", ChannelNum));
+        continue;
+      }
+
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Response data size = 0x%x\n", ResponseDataSize));
+      if ((GetChanelInfoResponse.CompletionCode != IPMI_COMP_CODE_NORMAL) || (ResponseDataSize == 0)) {
+        DEBUG ((DEBUG_ERROR, "    - Command returned fail: 0x%x.\n", GetChanelInfoResponse.CompletionCode));
+        continue;
+      }
+
+      DEBUG ((
+        DEBUG_REDFISH_HOST_INTERFACE,
+        "    - Channel protocol = 0x%x, Media = 0x%x\n",
+        GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType,
+        GetChanelInfoResponse.MediumType.Bits.ChannelMediumType
+        ));
+
+      if (GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo != ChannelNum) {
+        DEBUG ((
+          DEBUG_ERROR,
+          "    - ChannelNumber = %d in the response which is not macthed to the request.\n",
+          GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo
+          ));
+        continue;
+      }
+
+      if ((GetChanelInfoResponse.MediumType.Bits.ChannelMediumType == IPMI_CHANNEL_MEDIA_TYPE_802_3_LAN) &&
+          (GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType == IPMI_CHANNEL_PROTOCOL_TYPE_IPMB_1_0))
+      {
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Channel %d is a LAN device!\n", ChannelNum));
+
+        ResponseDataSize = sizeof (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) +
+                           sizeof (IPMI_LAN_MAC_ADDRESS);
+        if (GetLanConfigReps == NULL) {
+          GetLanConfigReps =
+            (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE *)AllocateZeroPool (ResponseDataSize);
+          if (GetLanConfigReps == NULL) {
+            DEBUG ((DEBUG_ERROR, "    Allocate memory failed for getting MAC address.\n"));
+            continue;
+          }
+        }
+
+        GetLanConfigReq.ChannelNumber.Bits.ChannelNo = (UINT8)ChannelNum;
+        GetLanConfigReps->CompletionCode             = IPMI_COMP_CODE_UNSPECIFIED;
+        Status                                       = IpmiGetLanConfigurationParameters (
+                                                         &GetLanConfigReq,
+                                                         GetLanConfigReps,
+                                                         &ResponseDataSize
+                                                         );
+        if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode != IPMI_COMP_CODE_NORMAL)) {
+          DEBUG ((
+            DEBUG_ERROR,
+            "    Fails to get MAC address of channel %d, CompletionCode = %02x.\n",
+            ChannelNum,
+            GetLanConfigReps->CompletionCode
+            ));
+          continue;
+        } else {
+          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    The MAC address of channel %d.\n", ChannelNum));
+          DEBUG ((
+            DEBUG_REDFISH_HOST_INTERFACE,
+            "      %02x:%02x:%02x:%02x:%02x:%02x\n",
+            *((UINT8 *)(GetLanConfigReps + 1) + 0),
+            *((UINT8 *)(GetLanConfigReps + 1) + 1),
+            *((UINT8 *)(GetLanConfigReps + 1) + 2),
+            *((UINT8 *)(GetLanConfigReps + 1) + 3),
+            *((UINT8 *)(GetLanConfigReps + 1) + 4),
+            *((UINT8 *)(GetLanConfigReps + 1) + 5)
+            ));
+          IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
+          CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID *)(GetLanConfigReps + 1), IpmiLanMacAddressSize);
+        }
+      }
+    }
+
+    if (IpmiLanMacAddressSize != 0) {
+      if (!AlreadyCached) {
+        // Cache this IPMI LAN channel.
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Cache this IPMI LAN channel.\n"));
+        CacheIpmiLanMac ((UINT8)ChannelNum, &IpmiLanChannelMacAddress, IpmiLanMacAddressSize);
+      }
+
+      //
+      // According to design spec in Readme file under RedfishPkg.
+      // Compare the first five MAC address and
+      // the 6th MAC address.
+      //
+      if ((IpmiLanMacAddressSize != UsbNicInfo->MacAddressSize) ||
+          (CompareMem (
+             (VOID *)UsbNicInfo->MacAddress,
+             (VOID *)&IpmiLanChannelMacAddress.Addr,
+             IpmiLanMacAddressSize - 1
+             ) != 0) ||
+          (IpmiLanChannelMacAddress.Addr[IpmiLanMacAddressSize - 1] !=
+           *(UsbNicInfo->MacAddress + IpmiLanMacAddressSize - 1) - 1)
+          )
+      {
+        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is not matched.\n"));
+        continue;
+      }
+
+      // This is the NIC exposed by BMC.
+      UsbNicInfo->IpmiLanChannelNumber = (UINT8)ChannelNum;
+      UsbNicInfo->IsExposedByBmc       = TRUE;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is matched.\n"));
+      ExitStatus = EFI_SUCCESS;
+      break;
+    }
+  }
+
+  if (GetLanConfigReps != NULL) {
+    FreePool (GetLanConfigReps);
+  }
+
+  return ExitStatus;
+}
+
+/**
+  This function searches the next MSG_USB_DP device path node.
+
+  @param[in]  ThisDevicePath    Device path to search.
+
+  @retval NULL          MSG_USB_DP is not found.
+          Otherwise     MSG_USB_DP is found.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+UsbNicGetNextMsgUsbDp (
+  IN EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath
+  )
+{
+  if (ThisDevicePath == NULL) {
+    return NULL;
+  }
+
+  while (TRUE) {
+    ThisDevicePath = NextDevicePathNode (ThisDevicePath);
+    if (IsDevicePathEnd (ThisDevicePath)) {
+      return NULL;
+    }
+
+    if ((ThisDevicePath->Type == MESSAGING_DEVICE_PATH) && (ThisDevicePath->SubType == MSG_USB_DP)) {
+      return ThisDevicePath;
+    }
+  }
+
+  return NULL;
+}
+
+/**
+  This function search the UsbIo handle that matches the UsbDevicePath.
+
+  @param[in]  UsbDevicePath    Device path of this SNP handle.
+  @param[out] UsbIo            Return the UsbIo protocol.
+
+  @retval EFI_SUCCESS          Yes, UsbIo protocl is found.
+  @retval EFI_NOT_FOUND        No, UsbIo protocl is not found
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+UsbNicSearchUsbIo (
+  IN   EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath,
+  OUT  EFI_USB_IO_PROTOCOL       **UsbIo
+  )
+{
+  EFI_STATUS                Status;
+  UINTN                     BufferSize;
+  EFI_HANDLE                *HandleBuffer;
+  UINT16                    Length;
+  UINTN                     Index;
+  CHAR16                    *DevicePathStr;
+  EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePathEnd;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePathEnd;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));  DEBUG 
+ ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on the EFI handle which 
+ has UsbIo and SNP instaleld on it.\n"));  DevicePathStr = 
+ ConvertDevicePathToText (UsbDevicePath, FALSE, FALSE);  DEBUG 
+ ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));  FreePool 
+ (DevicePathStr);

It would be better to consider the case when ConvertDevicePathToText() returns NULL pointer.

+
+  BufferSize   = 0;
+  HandleBuffer = NULL;
+  *UsbIo       = NULL;
+  Status       = gBS->LocateHandle (
+                        ByProtocol,
+                        &gEfiUsbIoProtocolGuid,
+                        NULL,
+                        &BufferSize,
+                        NULL
+                        );
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  %d UsbIo protocol instances.\n", BufferSize/sizeof (EFI_HANDLE)));
+    HandleBuffer = AllocateZeroPool (BufferSize);
+    if (HandleBuffer == NULL) {
+      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the handles.\n"));
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gBS->LocateHandle (
+                    ByProtocol,
+                    &gEfiUsbIoProtocolGuid,
+                    NULL,
+                    &BufferSize,
+                    HandleBuffer
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "  Falied to locate UsbIo protocol handles.\n"));
+      FreePool (HandleBuffer);
+      return Status;
+    }
+  } else {
+    return Status;
+  }
+
+  for (Index = 0; Index < (BufferSize/sizeof (EFI_HANDLE)); Index++) {
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiDevicePathProtocolGuid,
+                    (VOID **)&ThisDevicePath
+                    );
+    if (EFI_ERROR (Status)) {
+      continue;
+    }
+
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on #%d instance of UsbIo.\n", Index));
+    DevicePathStr = ConvertDevicePathToText (ThisDevicePath, FALSE, FALSE);
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));
+    FreePool (DevicePathStr);

It would be better to consider the case when ConvertDevicePathToText() returns NULL pointer.

Thanks,
Nickle

+
+    Status = EFI_NOT_FOUND;
+
+    // Search for the starting MSG_USB_DP node.
+    ThisUsbDevicePath = UsbDevicePath;
+    if ((DevicePathType (ThisUsbDevicePath) != MESSAGING_DEVICE_PATH) ||
+        (DevicePathSubType (ThisUsbDevicePath) != MSG_USB_DP))
+    {
+      ThisUsbDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePath);
+      if (ThisUsbDevicePath == NULL) {
+        continue;
+      }
+    }
+
+    if ((DevicePathType (ThisDevicePath) != MESSAGING_DEVICE_PATH) ||
+        (DevicePathSubType (ThisDevicePath) != MSG_USB_DP))
+    {
+      ThisDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePath);
+      if (ThisDevicePath == NULL) {
+        continue;
+      }
+    }
+
+    // Search for the ending MSG_USB_DP node.
+    ThisDevicePathEnd    = ThisDevicePath;
+    ThisUsbDevicePathEnd = ThisUsbDevicePath;
+    while (TRUE) {
+      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePathEnd);
+      if (TempDevicePath == NULL) {
+        break;
+      }
+
+      ThisDevicePathEnd = TempDevicePath;
+    }
+
+    while (TRUE) {
+      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePathEnd);
+      if (TempDevicePath == NULL) {
+        break;
+      }
+
+      ThisUsbDevicePathEnd = TempDevicePath;
+    }
+
+    // Compare these two device paths
+    Length = (UINT16)((UINTN)(UINT8 *)ThisDevicePathEnd + DevicePathNodeLength (ThisDevicePathEnd) - (UINTN)(UINT8 *)ThisDevicePath);
+    if (Length != ((UINTN)(UINT8 *)ThisUsbDevicePathEnd + DevicePathNodeLength (ThisUsbDevicePathEnd) - (UINTN)(UINT8 *)ThisUsbDevicePath)) {
+      continue;
+    }
+
+    if (CompareMem (
+          (VOID *)ThisDevicePath,
+          (VOID *)ThisUsbDevicePath,
+          Length
+          ) == 0)
+    {
+      Status = EFI_SUCCESS;
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "EFI handle with the correct UsbIo is found at #%d instance of UsbIo.\n", Index));
+      break;
+    }
+  }
+
+  if (Status == EFI_SUCCESS) {
+    // Locate UsbIo from this handle.
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiUsbIoProtocolGuid,
+                    (VOID **)UsbIo
+                    );
+    return Status;
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function identifies if the USB NIC is exposed by BMC as
+  the host-BMC channel.
+
+  @param[in] Handle          This is the EFI handle with SNP installed.
+  @param[in] UsbDevicePath   USB device path.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+IdentifyUsbNicBmcChannel (
+  IN EFI_HANDLE                Handle,
+  IN EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath
+  )
+{
+  UINTN                            Index;
+  EFI_STATUS                       Status;
+  EFI_SIMPLE_NETWORK_PROTOCOL      *Snp;
+  EFI_USB_IO_PROTOCOL              *UsbIo;
+  HOST_INTERFACE_BMC_USB_NIC_INFO  *BmcUsbNic;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));  Status = 
+ gBS->HandleProtocol (
+                  Handle,
+                  &gEfiSimpleNetworkProtocolGuid,
+                  (VOID **)&Snp
+                  );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "    Failed to locate SNP.\n"));
+    return Status;
+  }
+
+  Status = UsbNicSearchUsbIo (UsbDevicePath, &UsbIo);  if (EFI_ERROR 
+ (Status)) {
+    DEBUG ((DEBUG_ERROR, "    Failed to find USBIO.\n"));
+    return Status;
+  }
+
+  // Get the MAC address of this SNP instance.
+  BmcUsbNic = AllocateZeroPool (sizeof 
+ (HOST_INTERFACE_BMC_USB_NIC_INFO));
+  if (BmcUsbNic == NULL) {
+    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for HOST_INTERFACE_BMC_USB_NIC_INFO.\n"));
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  InitializeListHead (&BmcUsbNic->NextInstance);  
+ BmcUsbNic->MacAddressSize = Snp->Mode->HwAddressSize;
+  BmcUsbNic->MacAddress     = AllocateZeroPool (sizeof (BmcUsbNic->MacAddressSize));
+  if (BmcUsbNic->MacAddress == NULL) {
+    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for HW MAC addresss.\n"));
+    FreePool (BmcUsbNic);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  CopyMem (
+    (VOID *)BmcUsbNic->MacAddress,
+    (VOID *)&Snp->Mode->CurrentAddress,
+    BmcUsbNic->MacAddressSize
+    );
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address (in size %d) for this SNP instance:\n      ", BmcUsbNic->MacAddressSize));
+  for (Index = 0; Index < BmcUsbNic->MacAddressSize; Index++) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%02x ", 
+ *(BmcUsbNic->MacAddress + Index)));  }
+
+  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "\n"));
+  BmcUsbNic->ThisSnp   = Snp;
+  BmcUsbNic->ThisUsbIo = UsbIo;
+
+  Status = HostInterfaceIpmiCheckMacAddress (BmcUsbNic);  if (Status == 
+ EFI_SUCCESS) {
+    BmcUsbNic->IsExposedByBmc = TRUE;
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC is found.\n"));
+  } else {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC is not found.\n"));
+  }
+
+  InsertTailList (&mBmcUsbNic, &BmcUsbNic->NextInstance);
+  return Status;
+}
+
+/**
+  This function checks if the USB NIC exposed by BMC
+  on each handle has SNP protocol installed on it.
+
+  @param[in] HandleNumer    Number of handles to check.
+  @param[in] HandleBuffer   Handles buffer.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckBmcUsbNicOnHandles (
+  IN  UINTN       HandleNumer,
+  IN  EFI_HANDLE  *HandleBuffer
+  )
+{
+  UINTN                     Index;
+  EFI_STATUS                Status;
+  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
+  BOOLEAN                   GotOneUsbNIc;
+
+  if ((HandleNumer == 0) || (HandleBuffer == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: Entry, #%d SNP handle\n", __FUNCTION__, 
+ HandleNumer));
+
+  GotOneUsbNIc = FALSE;
+  for (Index = 0; Index < HandleNumer; Index++) {
+    Status = gBS->HandleProtocol (
+                    *(HandleBuffer + Index),
+                    &gEfiDevicePathProtocolGuid,
+                    (VOID **)&DevicePath
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "    Failed to locate SNP on %d handle.\n", __FUNCTION__, Index));
+      continue;
+    }
+
+    // Check if this is an BMC exposed USB NIC device.
+    while (TRUE) {
+      if ((DevicePath->Type == MESSAGING_DEVICE_PATH) && (DevicePath->SubType == MSG_USB_DP)) {
+        Status = IdentifyUsbNicBmcChannel (*(HandleBuffer + Index), DevicePath);
+        if (!EFI_ERROR (Status)) {
+          GotOneUsbNIc = TRUE;
+          break;
+        }
+      }
+
+      DevicePath = NextDevicePathNode (DevicePath);
+      if (IsDevicePathEnd (DevicePath)) {
+        break;
+      }
+    }
+  }
+
+  if (GotOneUsbNIc) {
+    return EFI_SUCCESS;
+  }
+
+  return EFI_NOT_FOUND;
+}
+
+/**
+  This function checks if the USB NIC exposed by BMC
+  is already connected.
+
+  @param[in] Registration      Locate SNP protocol from the notification
+                               registeration key.
+                               NULL means locate SNP protocol from the existing
+                               handles.
+
+  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
+  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
+                               on the existing SNP handle.
+  @retval Others               Other errors.
+
+**/
+EFI_STATUS
+CheckBmcUsbNic (
+  VOID  *Registration
+  )
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  Handle;
+  UINTN       BufferSize;
+  EFI_HANDLE  *HandleBuffer;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry, the registration key - 0x%08x.\n", 
+ __FUNCTION__, Registration));
+
+  Handle     = NULL;
+  Status     = EFI_SUCCESS;
+  BufferSize = 0;
+
+  Status = gBS->LocateHandle (
+                  Registration == NULL ? ByProtocol : ByRegisterNotify,
+                  &gEfiSimpleNetworkProtocolGuid,
+                  Registration,
+                  &BufferSize,
+                  NULL
+                  );
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    %d SNP protocol instances.\n", BufferSize/sizeof (EFI_HANDLE)));
+    HandleBuffer = AllocateZeroPool (BufferSize);
+    if (HandleBuffer == NULL) {
+      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the handles.\n"));
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gBS->LocateHandle (
+                    Registration == NULL ? ByProtocol : ByRegisterNotify,
+                    &gEfiSimpleNetworkProtocolGuid,
+                    Registration,
+                    &BufferSize,
+                    HandleBuffer
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "    Falied to locate SNP protocol handles.\n"));
+      FreePool (HandleBuffer);
+      return Status;
+    }
+  } else if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  // Check USB NIC on handles.
+  Status = CheckBmcUsbNicOnHandles (BufferSize/sizeof (EFI_HANDLE), 
+ HandleBuffer);  if (!EFI_ERROR (Status)) {
+    // Retrieve the rest of BMC USB NIC information for Redfish over IP information
+    // and USB Network Interface V2.
+    Status = RetrievedBmcUsbNicInfo ();
+    if (!EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Install protocol to notify the platform Redfish Host Interface information is ready.\n"));
+      Status = gBS->InstallProtocolInterface (
+                      &Handle,
+                      &mPlatformHostInterfaceBmcUsbNicReadinessGuid,
+                      EFI_NATIVE_INTERFACE,
+                      NULL
+                      );
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "    Install protocol fail %r.\n", Status));
+      }
+    }
+  }
+
+  FreePool (HandleBuffer);
+  return Status;
+}
+
+/**
+  Notification event of SNP readiness.
+
+  @param[in]  Event                 Event whose notification function is being invoked.
+  @param[in]  Context               The pointer to the notification function's context,
+                                    which is implementation-dependent.
+
+**/
+VOID
+EFIAPI
+PlatformHostInterfaceSnpCallback (
+  IN  EFI_EVENT  Event,
+  IN  VOID       *Context
+  )
+{
+  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
+
+  CheckBmcUsbNic (mPlatformHostInterfaceSnpRegistration);
+  return;
+}
+
+/**
+  Get the EFI protocol GUID installed by platform library which
+  indicates the necessary information is ready for building
+  SMBIOS 42h record.
+
+  @param[out] InformationReadinessGuid  Pointer to retrive the protocol
+                                        GUID.
+
+  @retval EFI_SUCCESS          Notification is required for building up
+                               SMBIOS type 42h record.
+  @retval EFI_UNSUPPORTED      Notification is not required for building up
+                               SMBIOS type 42h record.
+  @retval EFI_ALREADY_STARTED  Platform host information is already ready.
+  @retval Others               Other errors.
+**/
+EFI_STATUS
+RedfishPlatformHostInterfaceNotification (
+  OUT EFI_GUID  **InformationReadinessGuid
+  )
+{
+  EFI_STATUS  Status;
+
+  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
+
+  *InformationReadinessGuid = NULL;
+  InitializeListHead (&mBmcUsbNic);
+  InitializeListHead (&mBmcIpmiLan);
+
+  //
+  // Check if USB NIC exposed by BMC is already  // connected.
+  //
+  Status = CheckBmcUsbNic (NULL);
+  if (!EFI_ERROR (Status)) {
+    return EFI_ALREADY_STARTED;
+  }
+
+  if (Status == EFI_NOT_FOUND) {
+    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%a: BMC USB NIC is not 
+ found. Register the notification.\n", __FUNCTION__));
+
+    // Register the notification of SNP installation.
+    Status = gBS->CreateEvent (
+                    EVT_NOTIFY_SIGNAL,
+                    TPL_CALLBACK,
+                    PlatformHostInterfaceSnpCallback,
+                    NULL,
+                    &mPlatformHostInterfaceSnpEvent
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Fail to create event for the installation of SNP protocol.", __FUNCTION__));
+      return Status;
+    }
+
+    Status = gBS->RegisterProtocolNotify (
+                    &gEfiSimpleNetworkProtocolGuid,
+                    mPlatformHostInterfaceSnpEvent,
+                    &mPlatformHostInterfaceSnpRegistration
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Fail to register event for the installation of SNP protocol.", __FUNCTION__));
+      return Status;
+    }
+
+    *InformationReadinessGuid = &mPlatformHostInterfaceBmcUsbNicReadinessGuid;
+    return EFI_SUCCESS;
+  }
+
+  DEBUG ((DEBUG_ERROR, "%a: Something wrong when look for BMC USB 
+NIC.\n", __FUNCTION__));
+  return Status;
+}
--
2.37.1.windows.1

Re: [PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host Interface

[Chang, Abner]

[AMD Official Use Only - General]

Hi Nickle,
Thanks for those good comments. V2 patch was just sent!

Abner

> -----Original Message-----
> From: Nickle Wang <nicklew@nvidia.com>
> Sent: Monday, March 20, 2023 11:13 AM
> To: Chang, Abner <Abner.Chang@amd.com>; devel@edk2.groups.io
> Cc: Igor Kulchytskyy <igork@ami.com>
> Subject: RE: [PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host
> Interface
> 
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
> 
> 
> Please find my comment inline below, thanks!
> 
> Regards,
> Nickle
> 
> -----Original Message-----
> From: abner.chang@amd.com <abner.chang@amd.com>
> Sent: Thursday, March 9, 2023 11:41 PM
> To: devel@edk2.groups.io
> Cc: Nickle Wang <nicklew@nvidia.com>; Igor Kulchytskyy <igork@ami.com>
> Subject: [PATCH 1/3] RedfishPkg/Library: Redfish BMC USBNIC Host Interface
> 
> External email: Use caution opening links or attachments
> 
> 
> From: Abner Chang <abner.chang@amd.com>
> 
> BMC exposed USB NIC platform Redfish Host Interface library
> implementation.
> 
> Signed-off-by: Abner Chang <abner.chang@amd.com>
> Cc: Nickle Wang <nicklew@nvidia.com>
> Cc: Igor Kulchytskyy <igork@ami.com>
> ---
>  RedfishPkg/RedfishPkg.dec                     |   10 +
>  .../PlatformHostInterfaceBmcUsbNicLib.inf     |   48 +
>  RedfishPkg/Include/Library/RedfishDebugLib.h  |    3 +-
>  .../PlatformHostInterfaceBmcUsbNicLib.h       |   84 ++
>  .../PlatformHostInterfaceBmcUsbNicLib.c       | 1280 +++++++++++++++++
>  5 files changed, 1424 insertions(+), 1 deletion(-)  create mode 100644
> RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterf
> aceBmcUsbNicLib.inf
>  create mode 100644
> RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterf
> aceBmcUsbNicLib.h
>  create mode 100644
> RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterf
> aceBmcUsbNicLib.c
> 
> diff --git a/RedfishPkg/RedfishPkg.dec b/RedfishPkg/RedfishPkg.dec index
> 53e52c2b008..251aa5e2b76 100644
> --- a/RedfishPkg/RedfishPkg.dec
> +++ b/RedfishPkg/RedfishPkg.dec
> @@ -113,3 +113,13 @@
>    # Default is set to not add.
>    #
> 
> gEfiRedfishPkgTokenSpaceGuid.PcdRedfishRestExAddingExpect|FALSE|BOO
> LEAN|0x00001004
> +  #
> +  # Use PCD to declare the Redfish host nmae becasue there is no  #
> + specification for that.
> +  #
> +
> gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName|""|VOID*|0x0000100
> 5
> +  #
> +  # Use PCD to declare the Redfish service UUID becasue there is no  #
> + specification for that.
> +  #
> +
> +
> gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid|L""|VOID*|0x00001
> 00
> + 6
> 
> Would it be good to provide dummy string for above PCDs? For example:
> 
> gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName|"edk2_redfishpkg"|V
> OID*|0x00001005
> gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid|L"0000000000000000
> "|VOID*|0x0000100
> 
> diff --git
> a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.inf
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.inf
> new file mode 100644
> index 00000000000..f2c7d7fec89
> --- /dev/null
> +++
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
> +++ nterfaceBmcUsbNicLib.inf
> @@ -0,0 +1,48 @@
> +## @file
> +#  Module to provide the platform Redfish Host Interface information #
> +of USB NIC Device exposed by BMC.
> +#
> +# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
> +#
> +#  SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001000b
> +  BASE_NAME                      = PlatformHostInterfaceBmcUsbNicLib
> +  FILE_GUID                      = C4837B58-225E-4352-8FDC-4C52A5D65891
> +  MODULE_TYPE                    = DXE_DRIVER
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = PlatformHostInterfaceBmcUsbNicLib
> +
> +[Sources]
> +  PlatformHostInterfaceBmcUsbNicLib.c
> +  PlatformHostInterfaceBmcUsbNicLib.h
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  NetworkPkg/NetworkPkg.dec
> +  RedfishPkg/RedfishPkg.dec
> +
> +[LibraryClasses]
> +  BaseMemoryLib
> +  DebugLib
> +  IpmiLib
> +  IpmiCommandLib
> +  MemoryAllocationLib
> +  UefiLib
> +  UefiBootServicesTableLib
> +
> +[Protocols]
> +  gEfiSimpleNetworkProtocolGuid                 ## CONSUMED
> +  gEfiUsbIoProtocolGuid                         ## CONSUMED
> +  gEfiDevicePathProtocolGuid                    ## CONSUMED
> +
> +[Pcd]
> +  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishHostName     ## CONSUMED
> +  gEfiRedfishPkgTokenSpaceGuid.PcdRedfishServiceUuid  ## CONSUMED
> +
> +[Depex]
> +  gIpmiProtocolGuid
> diff --git a/RedfishPkg/Include/Library/RedfishDebugLib.h
> b/RedfishPkg/Include/Library/RedfishDebugLib.h
> index 21f01353ede..913f2b2f358 100644
> --- a/RedfishPkg/Include/Library/RedfishDebugLib.h
> +++ b/RedfishPkg/Include/Library/RedfishDebugLib.h
> @@ -14,7 +14,8 @@
>  #include <Library/JsonLib.h>
>  #include <Library/RedfishLib.h>
> 
> -#define DEBUG_REDFISH_NETWORK  DEBUG_INFO   ///< Debug error level
> for Redfish networking function
> +#define DEBUG_REDFISH_NETWORK         DEBUG_INFO   ///< Debug error
> level for Redfish networking function
> +#define DEBUG_REDFISH_HOST_INTERFACE  DEBUG_INFO   ///< Debug
> error level for Redfish networking function
> 
>  /**
> 
> diff --git
> a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.h
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.h
> new file mode 100644
> index 00000000000..669c304fc3d
> --- /dev/null
> +++
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
> +++ nterfaceBmcUsbNicLib.h
> @@ -0,0 +1,84 @@
> +/** @file
> +  Header file to provide the platform Redfish Host Interface
> +information
> +  of USB NIC Device exposed by BMC.
> +
> +  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
> +#define PLATFORM_HOST_INTERFACE_BMC_USB_NIC_LIB_H_
> +
> +#include <Uefi.h>
> +#include <IndustryStandard/Ipmi.h>
> +#include <IndustryStandard/IpmiNetFnApp.h> #include
> +<IndustryStandard/IpmiNetFnTransport.h>
> +#include <IndustryStandard/RedfishHostInterfaceIpmi.h>
> +#include <IndustryStandard/SmBios.h>
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/DevicePathLib.h>
> +#include <Library/IpmiLib.h>
> +#include <Library/IpmiCommandLib.h>
> +#include <Library/RedfishHostInterfaceLib.h>
> +#include <Library/MemoryAllocationLib.h> #include
> +<Library/UefiBootServicesTableLib.h>
> +#include <Library/DevicePathLib.h>
> +#include <Library/RedfishDebugLib.h>
> +
> +#include <Protocol/SimpleNetwork.h>
> +#include <Protocol/UsbIo.h>
> +
> +#define BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID \
> +    {  \
> +      0xDD96F5D7, 0x4AE1, 0x4E6C, {0xA1, 0x30, 0xA5, 0xAC, 0x77, 0xDD, 0xE4,
> 0xA5} \
> +    }
> +
> +//
> +// This is the structure for BMC exposed // USB NIC information.
> +//
> +typedef struct {
> +  LIST_ENTRY                     NextInstance;              ///< Link to the next instance.
> +  BOOLEAN                        IsExposedByBmc;            ///< Flag indicates this USB
> NIC is
> +                                                            ///< exposed by BMC.
> +  BOOLEAN                        IsSuppportedHostInterface; ///< This BMC USB NIC is
> supported
> +                                                            ///< as Redfish host interface
> +  EFI_SIMPLE_NETWORK_PROTOCOL    *ThisSnp;                  ///< The SNP
> instance associated with
> +                                                            ///< this USB NIC.
> +  EFI_USB_IO_PROTOCOL            *ThisUsbIo;                ///< The USBIO instance
> associated with
> +                                                            ///< this USB NIC.
> +  UINT16                         UsbVendorId;               ///< USB Vendor ID of this BMC
> exposed USB NIC.
> +  UINT16                         UsbProductId;              ///< USB Product ID of this BMC
> exposed USB NIC.
> +  UINTN                          MacAddressSize;            ///< HW address size.
> +  UINT8                          *MacAddress;               ///< HW address.
> +  UINT8                          IpmiLanChannelNumber;      ///< BMC IPMI Lan Channel
> number.
> +
> +  //
> +  // Below is the infortmation for building SMBIOS type 42.
> +  //
> +  UINT8                          IpAssignedType;          ///< Redfish service IP assign type.
> +  UINT8                          IpAddressFormat;         ///< Redfish service IP version.
> +  UINT8                          HostIpAddressIpv4[4];    ///< Host IP address.
> +  UINT8                          RedfishIpAddressIpv4[4]; ///< Redfish service IP
> address.
> +  UINT8                          SubnetMaskIpv4[4];       ///< Subnet mask.
> +  UINT8                          GatewayIpv4[4];          ///< Gateway IP address.
> +  UINT16                         VLanId;                  ///< VLAN ID.
> +  BOOLEAN                        CredentialBootstrapping; ///< If Credential
> bootstrapping is
> +                                                          ///< supported.
> +} HOST_INTERFACE_BMC_USB_NIC_INFO;
> +
> +//
> +// This is the structure for caching
> +// BMC IPMI LAN Channel
> +//
> +typedef struct {
> +  LIST_ENTRY         NextInstance;            ///< Link to the next IPMI LAN
> Channel.
> +  UINT8              Channel;                 ///< IPMI Channel number.
> +  EFI_MAC_ADDRESS    MacAddress;              ///< IPMI LAN Channel MAC
> address.
> +  UINT8              MacAddressSize;          ///< MAC address size;
> +} BMC_IPMI_LAN_CHANNEL_INFO;
> +#endif
> diff --git
> a/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.c
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInte
> rfaceBmcUsbNicLib.c
> new file mode 100644
> index 00000000000..1c530b692e8
> --- /dev/null
> +++
> b/RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostI
> +++ nterfaceBmcUsbNicLib.c
> @@ -0,0 +1,1280 @@
> +/** @file
> +  Source file to provide the platform Redfish Host Interface
> +information
> +  of USB NIC Device exposed by BMC.
> +
> +  Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include "PlatformHostInterfaceBmcUsbNicLib.h"
> +
> +static EFI_GUID  mPlatformHostInterfaceBmcUsbNicReadinessGuid =
> +  BMC_USB_NIC_HOST_INTERFASCE_READINESS_GUID;
> +static EFI_EVENT  mPlatformHostInterfaceSnpEvent         = NULL;
> +static VOID       *mPlatformHostInterfaceSnpRegistration = NULL;
> +
> +static LIST_ENTRY  mBmcUsbNic;
> +static LIST_ENTRY  mBmcIpmiLan;
> +
> +/**
> +  Probe if the system supports Redfish Host Interface Credentail
> +  Bootstrapping.
> +
> +  @retval TRUE   Yes, it is supported.
> +          TRUE   No, it is not supported.
> +
> +**/
> +BOOLEAN
> +ProbeRedfishCredentialBootstrap (
> +  VOID
> +  )
> +{
> +  EFI_STATUS                                  Status;
> +  IPMI_BOOTSTRAP_CREDENTIALS_COMMAND_DATA     CommandData;
> +  IPMI_BOOTSTRAP_CREDENTIALS_RESULT_RESPONSE  ResponseData;
> +  UINT32                                      ResponseSize;
> +  BOOLEAN                                     ReturnBool;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
> +
> +  //
> +  // IPMI callout to NetFn 2C, command 02
> +  //    Request data:
> +  //      Byte 1: REDFISH_IPMI_GROUP_EXTENSION
> +  //      Byte 2: DisableBootstrapControl
> +  //
> +  CommandData.GroupExtensionId        =
> REDFISH_IPMI_GROUP_EXTENSION;
> +  CommandData.DisableBootstrapControl =
> REDFISH_IPMI_BOOTSTRAP_CREDENTIAL_ENABLE;
> +  ResponseData.CompletionCode         = IPMI_COMP_CODE_UNSPECIFIED;
> +  ResponseSize                        = sizeof (ResponseData);
> +  //
> +  //  Response data: Ignored.
> +  //
> +  Status = IpmiSubmitCommand (
> +             IPMI_NETFN_GROUP_EXT,
> +             REDFISH_IPMI_GET_BOOTSTRAP_CREDENTIALS_CMD,
> +             (UINT8 *)&CommandData,
> +             sizeof (CommandData),
> +             (UINT8 *)&ResponseData,
> +             &ResponseSize
> +             );
> +  if (!EFI_ERROR (Status) &&
> +      ((ResponseData.CompletionCode == IPMI_COMP_CODE_NORMAL) ||
> +       (ResponseData.CompletionCode ==
> REDFISH_IPMI_COMP_CODE_BOOTSTRAP_CREDENTIAL_DISABLED)
> +      ))
> +  {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail
> Bootstrapping is supported\n", __FUNCTION__));
> +    ReturnBool = TRUE;
> +  } else {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Redfish Credentail
> Bootstrapping is not supported\n", __FUNCTION__));
> +    ReturnBool = FALSE;
> +  }
> +
> +  return ReturnBool;
> +}
> +
> +/**
> +  Get platform Redfish host interface device descriptor.
> +
> +  @param[in] DeviceType         Pointer to retrieve device type.
> +  @param[out] DeviceDescriptor  Pointer to retrieve
> REDFISH_INTERFACE_DATA, caller has to free
> +                                this memory using FreePool().
> +
> +  @retval EFI_NOT_FOUND   No Redfish host interface descriptor provided
> on this platform.
> +
> +**/
> +EFI_STATUS
> +RedfishPlatformHostInterfaceDeviceDescriptor (
> +  IN UINT8                    *DeviceType,
> +  OUT REDFISH_INTERFACE_DATA  **DeviceDescriptor
> +  )
> +{
> +  HOST_INTERFACE_BMC_USB_NIC_INFO  *ThisInstance;
> +  REDFISH_INTERFACE_DATA           *InterfaceData;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
> +
> +  if (IsListEmpty (&mBmcUsbNic)) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  // Check if BMC exposed USB NIC is found and ready for using.
> +  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode
> + (&mBmcUsbNic);  while (TRUE) {
> +    if (ThisInstance->IsExposedByBmc && ThisInstance-
> >IsSuppportedHostInterface) {
> +      *DeviceType = REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
> +
> +      // Fill up REDFISH_INTERFACE_DATA defined in Redfish host interface
> spec v1.3
> +      InterfaceData = (REDFISH_INTERFACE_DATA *)AllocateZeroPool
> (USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3);
> +      if (InterfaceData == NULL) {
> +        DEBUG ((DEBUG_ERROR, "Failed to allocate memory for
> REDFISH_INTERFACE_DATA\n"));
> +        return EFI_OUT_OF_RESOURCES;
> +      }
> +
> +      InterfaceData->DeviceType                                   =
> REDFISH_HOST_INTERFACE_DEVICE_TYPE_USB_V2;
> +      InterfaceData->DeviceDescriptor.UsbDeviceV2.Length          =
> USB_INTERFACE_DEVICE_DESCRIPTOR_V2_SIZE_1_3;
> +      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdVendor        =
> ThisInstance->UsbVendorId;
> +      InterfaceData->DeviceDescriptor.UsbDeviceV2.IdProduct       =
> ThisInstance->UsbProductId;
> +      InterfaceData->DeviceDescriptor.UsbDeviceV2.SerialNumberStr = 0;
> +      CopyMem (
> +        (VOID *)&InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress,
> +        (VOID *)&ThisInstance->MacAddress,
> +        sizeof (InterfaceData->DeviceDescriptor.UsbDeviceV2.MacAddress)
> +        );
> +      InterfaceData->DeviceDescriptor.UsbDeviceV2.Characteristics              |=
> (UINT16)ThisInstance->CredentialBootstrapping;
> +      InterfaceData-
> >DeviceDescriptor.UsbDeviceV2.CredentialBootstrappingHandle = 0;
> +      *DeviceDescriptor                                                         = InterfaceData;
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "
> REDFISH_INTERFACE_DATA is returned successfully.\n"));
> +      return EFI_SUCCESS;
> +    }
> +
> +    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
> +      break;
> +    }
> +
> +    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
> +                   GetNextNode (&mBmcUsbNic,
> + &ThisInstance->NextInstance);  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  Get platform Redfish host interface protocol data.
> +  Caller should pass NULL in ProtocolRecord to retrive the first protocol
> record.
> +  Then continuously pass previous ProtocolRecord for retrieving the next
> ProtocolRecord.
> +
> +  @param[in, out] ProtocolRecord  Pointer to retrieve the first or the next
> protocol record.
> +                                  caller has to free the new protocol record returned from
> +                                  this function using FreePool().
> +  @param[in] IndexOfProtocolData  The index of protocol data.
> +
> +  @retval EFI_NOT_FOUND   No more protocol records.
> +
> +**/
> +EFI_STATUS
> +RedfishPlatformHostInterfaceProtocolData (
> +  IN OUT MC_HOST_INTERFACE_PROTOCOL_RECORD  **ProtocolRecord,
> +  IN UINT8                                  IndexOfProtocolData
> +  )
> +{
> +  HOST_INTERFACE_BMC_USB_NIC_INFO    *ThisInstance;
> +  MC_HOST_INTERFACE_PROTOCOL_RECORD  *ThisProtocolRecord;
> +  REDFISH_OVER_IP_PROTOCOL_DATA      *RedfishOverIpData;
> +  UINT8                              HostNameLength;
> +  CHAR8                              *HostNameString;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
> +
> +  if (IsListEmpty (&mBmcUsbNic) || (IndexOfProtocolData > 0)) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode
> + (&mBmcUsbNic);  while (TRUE) {
> +    if (ThisInstance->IsExposedByBmc  && ThisInstance-
> >IsSuppportedHostInterface) {
> +      // Get the host name before allocating memory.
> +      HostNameString     = (CHAR8 *)PcdGetPtr (PcdRedfishHostName);
> +      HostNameLength     = (UINT8)AsciiStrSize (HostNameString);
> +      ThisProtocolRecord = (MC_HOST_INTERFACE_PROTOCOL_RECORD
> *)AllocateZeroPool (
> +                                                                  sizeof
> (MC_HOST_INTERFACE_PROTOCOL_RECORD) - 1 +
> +                                                                  sizeof
> (REDFISH_OVER_IP_PROTOCOL_DATA) +
> +                                                                  HostNameLength
> +                                                                  );
> +      if (ThisProtocolRecord == NULL) {
> +        DEBUG ((DEBUG_ERROR, "    Aloocate memory fail for
> MC_HOST_INTERFACE_PROTOCOL_RECORD.\n"));
> +        return EFI_OUT_OF_RESOURCES;
> +      }
> +
> +      ThisProtocolRecord->ProtocolType        =
> MCHostInterfaceProtocolTypeRedfishOverIP;
> +      ThisProtocolRecord->ProtocolTypeDataLen = sizeof
> (REDFISH_OVER_IP_PROTOCOL_DATA) + HostNameLength;
> +      RedfishOverIpData                       = (REDFISH_OVER_IP_PROTOCOL_DATA
> *)&ThisProtocolRecord->ProtocolTypeData[0];
> +      //
> +      // Fill up REDFISH_OVER_IP_PROTOCOL_DATA
> +      //
> +
> +      // Service UUID
> +      ZeroMem ((VOID *)&RedfishOverIpData->ServiceUuid, sizeof
> (EFI_GUID));
> +      if (StrLen ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid)) != 0) {
> +        StrToGuid ((CONST CHAR16 *)PcdGetPtr (PcdRedfishServiceUuid),
> &RedfishOverIpData->ServiceUuid);
> +      }
> +
> +      // HostIpAddressFormat and RedfishServiceIpDiscoveryType
> +      RedfishOverIpData->HostIpAssignmentType          =
> RedfishHostIpAssignmentUnknown;
> +      RedfishOverIpData->RedfishServiceIpDiscoveryType =
> RedfishHostIpAssignmentUnknown;
> +      if (ThisInstance->IpAssignedType == IpmiStaticAddrsss) {
> +        RedfishOverIpData->HostIpAssignmentType          =
> RedfishHostIpAssignmentStatic;
> +        RedfishOverIpData->RedfishServiceIpDiscoveryType =
> RedfishHostIpAssignmentStatic;
> +      } else if (ThisInstance->IpAssignedType ==
> IpmiDynamicAddressBmcDhcp) {
> +        RedfishOverIpData->HostIpAssignmentType          =
> RedfishHostIpAssignmentDhcp;
> +        RedfishOverIpData->RedfishServiceIpDiscoveryType =
> RedfishHostIpAssignmentDhcp;
> +      }
> +
> +      // HostIpAddressFormat and RedfishServiceIpAddressFormat, only
> support IPv4 for now.
> +      RedfishOverIpData->HostIpAddressFormat           =
> REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
> +      RedfishOverIpData->RedfishServiceIpAddressFormat =
> + REDFISH_HOST_INTERFACE_HOST_IP_ADDRESS_FORMAT_IP4;
> +
> +      // HostIpAddress
> +      CopyMem (
> +        (VOID *)RedfishOverIpData->HostIpAddress,
> +        (VOID *)ThisInstance->HostIpAddressIpv4,
> +        sizeof (ThisInstance->HostIpAddressIpv4)
> +        );
> +
> +      // HostIpMask and RedfishServiceIpMask
> +      CopyMem (
> +        (VOID *)RedfishOverIpData->HostIpMask,
> +        (VOID *)ThisInstance->SubnetMaskIpv4,
> +        sizeof (ThisInstance->SubnetMaskIpv4)
> +        );
> +      CopyMem (
> +        (VOID *)RedfishOverIpData->RedfishServiceIpMask,
> +        (VOID *)ThisInstance->SubnetMaskIpv4,
> +        sizeof (ThisInstance->SubnetMaskIpv4)
> +        );
> +
> +      // RedfishServiceIpAddress
> +      CopyMem (
> +        (VOID *)RedfishOverIpData->RedfishServiceIpAddress,
> +        (VOID *)ThisInstance->RedfishIpAddressIpv4,
> +        sizeof (ThisInstance->RedfishIpAddressIpv4)
> +        );
> +
> +      // RedfishServiceIpPort
> +      RedfishOverIpData->RedfishServiceIpPort = 0;
> +
> +      // RedfishServiceVlanId
> +      RedfishOverIpData->RedfishServiceVlanId = ThisInstance->VLanId;
> +
> +      // RedfishServiceHostnameLength
> +      RedfishOverIpData->RedfishServiceHostnameLength =
> HostNameLength;
> +
> +      // Redfish host name.
> +      CopyMem (
> +        (VOID *)&RedfishOverIpData->RedfishServiceHostname,
> +        (VOID *)HostNameString,
> +        HostNameLength
> +        );
> +
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "
> MC_HOST_INTERFACE_PROTOCOL_RECORD is returned successfully.\n"));
> +      *ProtocolRecord = ThisProtocolRecord;
> +      return EFI_SUCCESS;
> +    }
> +
> +    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
> +      break;
> +    }
> +
> +    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
> +                   GetNextNode (&mBmcUsbNic,
> + &ThisInstance->NextInstance);  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  This function retrieve the information of BMC USB NIC.
> +
> +  @retval EFI_SUCCESS      All necessary information is retrieved.
> +  @retval EFI_NOT_FOUND    There is no BMC exposed USB NIC.
> +  @retval Others           Other errors.
> +
> +**/
> +EFI_STATUS
> +RetrievedBmcUsbNicInfo (
> +  VOID
> +  )
> +{
> +  EFI_STATUS                                      Status;
> +  UINT32                                          ResponseDataSize;
> +  HOST_INTERFACE_BMC_USB_NIC_INFO                 *ThisInstance;
> +  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST
> GetLanConfigReq;
> +  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *GetLanConfigReps;
> +  IPMI_LAN_IP_ADDRESS_SRC                         *IpAddressSrc;
> +  IPMI_LAN_IP_ADDRESS                             *DestIpAddress;
> +  IPMI_LAN_SUBNET_MASK                            *SubnetMask;
> +  IPMI_LAN_DEFAULT_GATEWAY                        *DefaultGateway;
> +  IPMI_LAN_VLAN_ID                                *LanVlanId;
> +  EFI_USB_DEVICE_DESCRIPTOR                       UsbDeviceDescriptor;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
> +
> +  if (IsListEmpty (&mBmcUsbNic)) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)GetFirstNode
> + (&mBmcUsbNic);  while (TRUE) {
> +    if (ThisInstance->IsExposedByBmc) {
> +      ThisInstance->IsSuppportedHostInterface = FALSE;
> +
> +      // Probe if Redfish Host Interface Credential Bootstrapping is supported.
> +      ThisInstance->CredentialBootstrapping =
> + ProbeRedfishCredentialBootstrap ();
> +
> +      // Get IP address source
> +      GetLanConfigReq.SetSelector                     = 0;
> +      GetLanConfigReq.BlockSelector                   = 0;
> +      GetLanConfigReq.ChannelNumber.Bits.ChannelNo    = ThisInstance-
> >IpmiLanChannelNumber;
> +      GetLanConfigReq.ChannelNumber.Bits.GetParameter = 0;
> +      GetLanConfigReq.ChannelNumber.Bits.Reserved     = 0;
> +      GetLanConfigReq.ParameterSelector               = IpmiLanIpAddressSource;
> +      ResponseDataSize                                = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof
> (IPMI_LAN_IP_ADDRESS_SRC);
> +      GetLanConfigReps                                =
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +      GetLanConfigReps->CompletionCode                =
> IPMI_COMP_CODE_UNSPECIFIED;
> +      Status                                          = IpmiGetLanConfigurationParameters (
> +                                                          &GetLanConfigReq,
> +                                                          GetLanConfigReps,
> +                                                          &ResponseDataSize
> +                                                          );
> +      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +        DEBUG ((DEBUG_ERROR, "    Failed to get IP address source at channel
> %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status,
> GetLanConfigReps->CompletionCode));
> +        FreePool (GetLanConfigReps);
> +        return Status;
> +      }
> +
> +      IpAddressSrc = (IPMI_LAN_IP_ADDRESS_SRC *)(GetLanConfigReps + 1);
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    IP address source at
> channel %d: %x\n", ThisInstance->IpmiLanChannelNumber, IpAddressSrc-
> >Bits.AddressSrc));
> +      ThisInstance->IpAssignedType = IpAddressSrc->Bits.AddressSrc;
> +      FreePool (GetLanConfigReps);
> +
> +      // Get LAN IPv4 IP address
> +      GetLanConfigReq.ParameterSelector = IpmiLanIpAddress;
> +      ResponseDataSize                  = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof
> (IPMI_LAN_IP_ADDRESS);
> +      GetLanConfigReps                  =
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +      GetLanConfigReps->CompletionCode  =
> IPMI_COMP_CODE_UNSPECIFIED;
> +      Status                            = IpmiGetLanConfigurationParameters (
> +                                            &GetLanConfigReq,
> +                                            GetLanConfigReps,
> +                                            &ResponseDataSize
> +                                            );
> +      if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +        DEBUG ((DEBUG_ERROR, "    Failed to get Dest IP address at channel %d:
> %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status,
> GetLanConfigReps->CompletionCode));
> +        FreePool (GetLanConfigReps);
> +        return Status;
> +      }
> +
> +      DestIpAddress = (IPMI_LAN_IP_ADDRESS *)(GetLanConfigReps + 1);
> +      DEBUG ((
> +        DEBUG_REDFISH_HOST_INTERFACE,
> +        "    Dest IP address at channel %d: %d.%d.%d.%d\n",
> +        ThisInstance->IpmiLanChannelNumber,
> +        DestIpAddress->IpAddress[0],
> +        DestIpAddress->IpAddress[1],
> +        DestIpAddress->IpAddress[2],
> +        DestIpAddress->IpAddress[3]
> +        ));
> +      CopyMem ((VOID *)&ThisInstance->RedfishIpAddressIpv4, (VOID
> *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
> +      //
> +      // According to UEFI spec, the IP address at BMC USB NIC host end is the
> IP address at BMC end minus 1.
> +      //
> +      CopyMem ((VOID *)&ThisInstance->HostIpAddressIpv4, (VOID
> *)&DestIpAddress->IpAddress, sizeof (DestIpAddress->IpAddress));
> +      ThisInstance->HostIpAddressIpv4[sizeof (ThisInstance-
> >HostIpAddressIpv4) - 1] -= 1;
> +      FreePool (GetLanConfigReps);
> +      DEBUG ((
> +        DEBUG_REDFISH_HOST_INTERFACE,
> +        "    Host IP address at channel %d: %d.%d.%d.%d\n",
> +        ThisInstance->IpmiLanChannelNumber,
> +        ThisInstance->HostIpAddressIpv4[0],
> +        ThisInstance->HostIpAddressIpv4[1],
> +        ThisInstance->HostIpAddressIpv4[2],
> +        ThisInstance->HostIpAddressIpv4[3]
> +        ));
> +
> +      // Get IPv4 subnet mask
> +      GetLanConfigReq.ParameterSelector = IpmiLanSubnetMask;
> +      ResponseDataSize                  = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof
> (IPMI_LAN_SUBNET_MASK);
> +      GetLanConfigReps                  =
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +      GetLanConfigReps->CompletionCode  =
> IPMI_COMP_CODE_UNSPECIFIED;
> +      Status                            = IpmiGetLanConfigurationParameters (
> +                                            &GetLanConfigReq,
> +                                            GetLanConfigReps,
> +                                            &ResponseDataSize
> +                                            );
> +      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +        DEBUG ((DEBUG_ERROR, "    Failed to get subnet mask at channel %d:
> %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status,
> GetLanConfigReps->CompletionCode));
> +        FreePool (GetLanConfigReps);
> +        return Status;
> +      }
> +
> +      SubnetMask = (IPMI_LAN_SUBNET_MASK *)(GetLanConfigReps + 1);
> +      DEBUG ((
> +        DEBUG_REDFISH_HOST_INTERFACE,
> +        "    Subnet mask at channel %d: %d.%d.%d.%d\n",
> +        ThisInstance->IpmiLanChannelNumber,
> +        SubnetMask->IpAddress[0],
> +        SubnetMask->IpAddress[1],
> +        SubnetMask->IpAddress[2],
> +        SubnetMask->IpAddress[3]
> +        ));
> +      CopyMem ((VOID *)&ThisInstance->SubnetMaskIpv4, (VOID
> *)&SubnetMask->IpAddress, sizeof (SubnetMask->IpAddress));
> +      FreePool (GetLanConfigReps);
> +
> +      // Get Gateway IP address.
> +      GetLanConfigReq.ParameterSelector = IpmiLanDefaultGateway;
> +      ResponseDataSize                  = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof
> (IPMI_LAN_DEFAULT_GATEWAY);
> +      GetLanConfigReps                  =
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +      GetLanConfigReps->CompletionCode  =
> IPMI_COMP_CODE_UNSPECIFIED;
> +      Status                            = IpmiGetLanConfigurationParameters (
> +                                            &GetLanConfigReq,
> +                                            GetLanConfigReps,
> +                                            &ResponseDataSize
> +                                            );
> +      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +        DEBUG ((DEBUG_ERROR, "    Failed to get default gateway at channel
> %d: %r, 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status,
> GetLanConfigReps->CompletionCode));
> +        FreePool (GetLanConfigReps);
> +        return Status;
> +      }
> +
> +      DefaultGateway = (IPMI_LAN_DEFAULT_GATEWAY
> *)(GetLanConfigReps + 1);
> +      DEBUG ((
> +        DEBUG_REDFISH_HOST_INTERFACE,
> +        "    Gateway at channel %d: %d.%d.%d.%d\n",
> +        ThisInstance->IpmiLanChannelNumber,
> +        DefaultGateway->IpAddress[0],
> +        DefaultGateway->IpAddress[1],
> +        DefaultGateway->IpAddress[2],
> +        DefaultGateway->IpAddress[3]
> +        ));
> +      CopyMem ((VOID *)&ThisInstance->GatewayIpv4, (VOID
> *)&DefaultGateway->IpAddress, sizeof (DefaultGateway->IpAddress));
> +      FreePool (GetLanConfigReps);
> +
> +      // Get VLAN ID
> +      GetLanConfigReq.ParameterSelector = IpmiLanVlanId;
> +      ResponseDataSize                  = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) + sizeof
> (IPMI_LAN_VLAN_ID);
> +      GetLanConfigReps                  =
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +      GetLanConfigReps->CompletionCode  =
> IPMI_COMP_CODE_UNSPECIFIED;
> +      Status                            = IpmiGetLanConfigurationParameters (
> +                                            &GetLanConfigReq,
> +                                            GetLanConfigReps,
> +                                            &ResponseDataSize
> +                                            );
> +      if ((EFI_ERROR (Status)) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +        DEBUG ((DEBUG_ERROR, "    Failed to get VLAN ID at channel %d: %r,
> 0x%02x.\n", ThisInstance->IpmiLanChannelNumber, Status,
> GetLanConfigReps->CompletionCode));
> +        FreePool (GetLanConfigReps);
> +        return Status;
> +      }
> +
> +      LanVlanId            = (IPMI_LAN_VLAN_ID *)(GetLanConfigReps + 1);
> +      ThisInstance->VLanId = 0;
> +      if (LanVlanId->Data2.Bits.Enabled == 1) {
> +        ThisInstance->VLanId = LanVlanId->Data1.VanIdLowByte | (LanVlanId-
> >Data2.Bits.VanIdHighByte << 8);
> +      }
> +
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    VLAN ID %x\n",
> ThisInstance->VLanId));
> +
> +      FreePool (GetLanConfigReps);
> +
> +      //
> +      // Read USB device information.
> +      //
> +      if (ThisInstance->ThisUsbIo != NULL) {
> +        Status = ThisInstance->ThisUsbIo->UsbGetDeviceDescriptor
> (ThisInstance->ThisUsbIo, &UsbDeviceDescriptor);
> +        if (!EFI_ERROR (Status)) {
> +          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    USB NIC Vendor ID:
> 0x%04x, Device ID: 0x%04x\n", UsbDeviceDescriptor.IdVendor,
> UsbDeviceDescriptor.IdProduct));
> +          ThisInstance->UsbVendorId  = UsbDeviceDescriptor.IdVendor;
> +          ThisInstance->UsbProductId = UsbDeviceDescriptor.IdProduct;
> +        } else {
> +          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Fail to get USB device
> descriptor.\n"));
> +        }
> +      }
> +
> +      // All information is retrieved.
> +      ThisInstance->IsSuppportedHostInterface = TRUE;
> +      return EFI_SUCCESS;
> +    }
> +
> +    if (IsNodeAtEnd (&mBmcUsbNic, &ThisInstance->NextInstance)) {
> +      break;
> +    }
> +
> +    ThisInstance = (HOST_INTERFACE_BMC_USB_NIC_INFO *)
> +                   GetNextNode (&mBmcUsbNic,
> + &ThisInstance->NextInstance);  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  This function caches the found IPMI LAN channel. So we
> +  don't have to sedn IPMI commands again if the USB NIC is
> +  connected later.
> +
> +  @param[in] ChannelNum                The IPMI channel number.
> +  @param[in] IpmiLanChannelMacAddress  Pointer to EFI_MAC_ADDRESS.
> +  @param[in] IpmiLanMacAddressSize     The MAC address size.
> +
> +  @retval EFI_SUCCESS          IPMI LAN channel is cached.
> +  @retval EFI_OUT_OF_RESOURCE  Memory allocated failed.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +CacheIpmiLanMac (
> +  IN UINT8            ChannelNum,
> +  IN EFI_MAC_ADDRESS  *IpmiLanChannelMacAddress,
> +  IN UINT8            IpmiLanMacAddressSize
> +  )
> +{
> +  BMC_IPMI_LAN_CHANNEL_INFO  *ChannelInfo;
> +
> +  ChannelInfo = (BMC_IPMI_LAN_CHANNEL_INFO *)AllocateZeroPool
> (sizeof
> + (BMC_IPMI_LAN_CHANNEL_INFO));  if (ChannelInfo == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  ChannelInfo->Channel = ChannelNum;
> +  CopyMem ((VOID *)&ChannelInfo->MacAddress.Addr, (VOID
> +*)IpmiLanChannelMacAddress->Addr, IpmiLanMacAddressSize);
> +  ChannelInfo->MacAddressSize = IpmiLanMacAddressSize;
> +  InitializeListHead (&ChannelInfo->NextInstance);
> +  InsertTailList (&mBmcIpmiLan, &ChannelInfo->NextInstance);
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  This function checks if the IPMI channel already identified
> +  previously.
> +
> +  @param[in]  ChannelNum            The IPMI channel number.
> +  @param[out] CachedIpmiLanChannel  Pointer to retrieve the cached
> +                                    BMC_IPMI_LAN_CHANNEL_INFO.
> +
> +  @retval EFI_SUCCESS          IPMI LAN channel is found.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +CheckCachedIpmiLanMac (
> +  IN UINT8                       ChannelNum,
> +  OUT BMC_IPMI_LAN_CHANNEL_INFO  **CachedIpmiLanChannel
> +  )
> +{
> +  BMC_IPMI_LAN_CHANNEL_INFO  *ThisInstance;
> +
> +  if (IsListEmpty (&mBmcIpmiLan)) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)GetFirstNode
> + (&mBmcIpmiLan);  while (TRUE) {
> +    if (ThisInstance->Channel == ChannelNum) {
> +      *CachedIpmiLanChannel = ThisInstance;
> +      return EFI_SUCCESS;
> +    }
> +
> +    if (IsNodeAtEnd (&mBmcIpmiLan, &ThisInstance->NextInstance)) {
> +      break;
> +    }
> +
> +    ThisInstance = (BMC_IPMI_LAN_CHANNEL_INFO *)
> +                   GetNextNode (&mBmcIpmiLan,
> + &ThisInstance->NextInstance);  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  This function goes through IPMI channels to find the
> +  mactched MAC addrss of BMC USB NIC endpoint.
> +
> +  @param[in] UsbNicInfo  The instance of
> HOST_INTERFACE_BMC_USB_NIC_INFO.
> +
> +  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
> +  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
> +                               on the existing SNP handle.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +HostInterfaceIpmiCheckMacAddress (
> +  IN HOST_INTERFACE_BMC_USB_NIC_INFO  *UsbNicInfo
> +  )
> +{
> +  EFI_STATUS                                      Status;
> +  EFI_STATUS                                      ExitStatus;
> +  UINTN                                           ChannelNum;
> +  UINT32                                          ResponseDataSize;
> +  IPMI_GET_CHANNEL_INFO_REQUEST                   GetChanelInfoRequest;
> +  IPMI_GET_CHANNEL_INFO_RESPONSE                  GetChanelInfoResponse;
> +  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_REQUEST
> GetLanConfigReq;
> +  IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *GetLanConfigReps;
> +  BMC_IPMI_LAN_CHANNEL_INFO                       *CachedIpmiLanChannel;
> +  UINT8                                           IpmiLanMacAddressSize;
> +  EFI_MAC_ADDRESS                                 IpmiLanChannelMacAddress;
> +  BOOLEAN                                         AlreadyCached;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
> +
> +  GetLanConfigReps = NULL;
> +  AlreadyCached    = FALSE;
> +  if (!IsListEmpty (&mBmcIpmiLan)) {
> +    AlreadyCached = TRUE;
> +  }
> +
> +  // Initial the get MAC address request.
> +  GetLanConfigReq.SetSelector       = 0;
> +  GetLanConfigReq.BlockSelector     = 0;
> +  GetLanConfigReq.ParameterSelector = IpmiLanMacAddress;
> +
> +  ExitStatus = EFI_NOT_FOUND;
> +  for (ChannelNum =
> IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_1;
> +       ChannelNum <=
> IPMI_CHANNEL_NUMBER_IMPLEMENTATION_SPECIFIC_11;
> +       ChannelNum++)
> +  {
> +    IpmiLanMacAddressSize = 0;
> +
> +    // Check if the IPMI channel information is already cached.
> +    Status = EFI_NOT_FOUND;
> +    if (AlreadyCached) {
> +      Status = CheckCachedIpmiLanMac ((UINT8)ChannelNum,
> &CachedIpmiLanChannel);
> +    }
> +
> +    if (Status == EFI_SUCCESS) {
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Got cached IPMI LAN
> info.\n"));
> +      IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
> +      CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID
> *)&CachedIpmiLanChannel->MacAddress.Addr, IpmiLanMacAddressSize);
> +    } else {
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  No cached IPMI LAN
> info\n"));
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  Send NetFn = App,
> Command = 0x42 to channel %d\n", ChannelNum));
> +      GetChanelInfoRequest.ChannelNumber.Bits.ChannelNo =
> (UINT8)ChannelNum;
> +      Status                                            = IpmiGetChannelInfo (
> +                                                            &GetChanelInfoRequest,
> +                                                            &GetChanelInfoResponse,
> +                                                            &ResponseDataSize
> +                                                            );
> +      if (EFI_ERROR (Status)) {
> +        DEBUG ((DEBUG_ERROR, "    - Fails to send command.\n",
> ChannelNum));
> +        continue;
> +      }
> +
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Response data size =
> 0x%x\n", ResponseDataSize));
> +      if ((GetChanelInfoResponse.CompletionCode !=
> IPMI_COMP_CODE_NORMAL) || (ResponseDataSize == 0)) {
> +        DEBUG ((DEBUG_ERROR, "    - Command returned fail: 0x%x.\n",
> GetChanelInfoResponse.CompletionCode));
> +        continue;
> +      }
> +
> +      DEBUG ((
> +        DEBUG_REDFISH_HOST_INTERFACE,
> +        "    - Channel protocol = 0x%x, Media = 0x%x\n",
> +        GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType,
> +        GetChanelInfoResponse.MediumType.Bits.ChannelMediumType
> +        ));
> +
> +      if (GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo !=
> ChannelNum) {
> +        DEBUG ((
> +          DEBUG_ERROR,
> +          "    - ChannelNumber = %d in the response which is not macthed to the
> request.\n",
> +          GetChanelInfoResponse.ChannelNumber.Bits.ChannelNo
> +          ));
> +        continue;
> +      }
> +
> +      if ((GetChanelInfoResponse.MediumType.Bits.ChannelMediumType ==
> IPMI_CHANNEL_MEDIA_TYPE_802_3_LAN) &&
> +          (GetChanelInfoResponse.ProtocolType.Bits.ChannelProtocolType ==
> IPMI_CHANNEL_PROTOCOL_TYPE_IPMB_1_0))
> +      {
> +        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    - Channel %d is a LAN
> device!\n", ChannelNum));
> +
> +        ResponseDataSize = sizeof
> (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE) +
> +                           sizeof (IPMI_LAN_MAC_ADDRESS);
> +        if (GetLanConfigReps == NULL) {
> +          GetLanConfigReps =
> +            (IPMI_GET_LAN_CONFIGURATION_PARAMETERS_RESPONSE
> *)AllocateZeroPool (ResponseDataSize);
> +          if (GetLanConfigReps == NULL) {
> +            DEBUG ((DEBUG_ERROR, "    Allocate memory failed for getting MAC
> address.\n"));
> +            continue;
> +          }
> +        }
> +
> +        GetLanConfigReq.ChannelNumber.Bits.ChannelNo =
> (UINT8)ChannelNum;
> +        GetLanConfigReps->CompletionCode             =
> IPMI_COMP_CODE_UNSPECIFIED;
> +        Status                                       = IpmiGetLanConfigurationParameters (
> +                                                         &GetLanConfigReq,
> +                                                         GetLanConfigReps,
> +                                                         &ResponseDataSize
> +                                                         );
> +        if (EFI_ERROR (Status) || (GetLanConfigReps->CompletionCode !=
> IPMI_COMP_CODE_NORMAL)) {
> +          DEBUG ((
> +            DEBUG_ERROR,
> +            "    Fails to get MAC address of channel %d, CompletionCode =
> %02x.\n",
> +            ChannelNum,
> +            GetLanConfigReps->CompletionCode
> +            ));
> +          continue;
> +        } else {
> +          DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    The MAC address of
> channel %d.\n", ChannelNum));
> +          DEBUG ((
> +            DEBUG_REDFISH_HOST_INTERFACE,
> +            "      %02x:%02x:%02x:%02x:%02x:%02x\n",
> +            *((UINT8 *)(GetLanConfigReps + 1) + 0),
> +            *((UINT8 *)(GetLanConfigReps + 1) + 1),
> +            *((UINT8 *)(GetLanConfigReps + 1) + 2),
> +            *((UINT8 *)(GetLanConfigReps + 1) + 3),
> +            *((UINT8 *)(GetLanConfigReps + 1) + 4),
> +            *((UINT8 *)(GetLanConfigReps + 1) + 5)
> +            ));
> +          IpmiLanMacAddressSize = sizeof (IPMI_LAN_MAC_ADDRESS);
> +          CopyMem ((VOID *)&IpmiLanChannelMacAddress.Addr, (VOID
> *)(GetLanConfigReps + 1), IpmiLanMacAddressSize);
> +        }
> +      }
> +    }
> +
> +    if (IpmiLanMacAddressSize != 0) {
> +      if (!AlreadyCached) {
> +        // Cache this IPMI LAN channel.
> +        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Cache this IPMI LAN
> channel.\n"));
> +        CacheIpmiLanMac ((UINT8)ChannelNum, &IpmiLanChannelMacAddress,
> IpmiLanMacAddressSize);
> +      }
> +
> +      //
> +      // According to design spec in Readme file under RedfishPkg.
> +      // Compare the first five MAC address and
> +      // the 6th MAC address.
> +      //
> +      if ((IpmiLanMacAddressSize != UsbNicInfo->MacAddressSize) ||
> +          (CompareMem (
> +             (VOID *)UsbNicInfo->MacAddress,
> +             (VOID *)&IpmiLanChannelMacAddress.Addr,
> +             IpmiLanMacAddressSize - 1
> +             ) != 0) ||
> +          (IpmiLanChannelMacAddress.Addr[IpmiLanMacAddressSize - 1] !=
> +           *(UsbNicInfo->MacAddress + IpmiLanMacAddressSize - 1) - 1)
> +          )
> +      {
> +        DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is not
> matched.\n"));
> +        continue;
> +      }
> +
> +      // This is the NIC exposed by BMC.
> +      UsbNicInfo->IpmiLanChannelNumber = (UINT8)ChannelNum;
> +      UsbNicInfo->IsExposedByBmc       = TRUE;
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address is
> matched.\n"));
> +      ExitStatus = EFI_SUCCESS;
> +      break;
> +    }
> +  }
> +
> +  if (GetLanConfigReps != NULL) {
> +    FreePool (GetLanConfigReps);
> +  }
> +
> +  return ExitStatus;
> +}
> +
> +/**
> +  This function searches the next MSG_USB_DP device path node.
> +
> +  @param[in]  ThisDevicePath    Device path to search.
> +
> +  @retval NULL          MSG_USB_DP is not found.
> +          Otherwise     MSG_USB_DP is found.
> +
> +**/
> +EFI_DEVICE_PATH_PROTOCOL *
> +UsbNicGetNextMsgUsbDp (
> +  IN EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath
> +  )
> +{
> +  if (ThisDevicePath == NULL) {
> +    return NULL;
> +  }
> +
> +  while (TRUE) {
> +    ThisDevicePath = NextDevicePathNode (ThisDevicePath);
> +    if (IsDevicePathEnd (ThisDevicePath)) {
> +      return NULL;
> +    }
> +
> +    if ((ThisDevicePath->Type == MESSAGING_DEVICE_PATH) &&
> (ThisDevicePath->SubType == MSG_USB_DP)) {
> +      return ThisDevicePath;
> +    }
> +  }
> +
> +  return NULL;
> +}
> +
> +/**
> +  This function search the UsbIo handle that matches the UsbDevicePath.
> +
> +  @param[in]  UsbDevicePath    Device path of this SNP handle.
> +  @param[out] UsbIo            Return the UsbIo protocol.
> +
> +  @retval EFI_SUCCESS          Yes, UsbIo protocl is found.
> +  @retval EFI_NOT_FOUND        No, UsbIo protocl is not found
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +UsbNicSearchUsbIo (
> +  IN   EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath,
> +  OUT  EFI_USB_IO_PROTOCOL       **UsbIo
> +  )
> +{
> +  EFI_STATUS                Status;
> +  UINTN                     BufferSize;
> +  EFI_HANDLE                *HandleBuffer;
> +  UINT16                    Length;
> +  UINTN                     Index;
> +  CHAR16                    *DevicePathStr;
> +  EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;
> +  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePath;
> +  EFI_DEVICE_PATH_PROTOCOL  *ThisDevicePathEnd;
> +  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePath;
> +  EFI_DEVICE_PATH_PROTOCOL  *ThisUsbDevicePathEnd;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));  DEBUG
> + ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on the EFI handle
> which
> + has UsbIo and SNP instaleld on it.\n"));  DevicePathStr =
> + ConvertDevicePathToText (UsbDevicePath, FALSE, FALSE);  DEBUG
> + ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));  FreePool
> + (DevicePathStr);
> 
> It would be better to consider the case when ConvertDevicePathToText()
> returns NULL pointer.
> 
> +
> +  BufferSize   = 0;
> +  HandleBuffer = NULL;
> +  *UsbIo       = NULL;
> +  Status       = gBS->LocateHandle (
> +                        ByProtocol,
> +                        &gEfiUsbIoProtocolGuid,
> +                        NULL,
> +                        &BufferSize,
> +                        NULL
> +                        );
> +  if (Status == EFI_BUFFER_TOO_SMALL) {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "  %d UsbIo protocol
> instances.\n", BufferSize/sizeof (EFI_HANDLE)));
> +    HandleBuffer = AllocateZeroPool (BufferSize);
> +    if (HandleBuffer == NULL) {
> +      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the
> handles.\n"));
> +      return EFI_OUT_OF_RESOURCES;
> +    }
> +
> +    Status = gBS->LocateHandle (
> +                    ByProtocol,
> +                    &gEfiUsbIoProtocolGuid,
> +                    NULL,
> +                    &BufferSize,
> +                    HandleBuffer
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "  Falied to locate UsbIo protocol handles.\n"));
> +      FreePool (HandleBuffer);
> +      return Status;
> +    }
> +  } else {
> +    return Status;
> +  }
> +
> +  for (Index = 0; Index < (BufferSize/sizeof (EFI_HANDLE)); Index++) {
> +    Status = gBS->HandleProtocol (
> +                    *(HandleBuffer + Index),
> +                    &gEfiDevicePathProtocolGuid,
> +                    (VOID **)&ThisDevicePath
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      continue;
> +    }
> +
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "Device path on #%d
> instance of UsbIo.\n", Index));
> +    DevicePathStr = ConvertDevicePathToText (ThisDevicePath, FALSE,
> FALSE);
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%s\n", DevicePathStr));
> +    FreePool (DevicePathStr);
> 
> It would be better to consider the case when ConvertDevicePathToText()
> returns NULL pointer.
> 
> Thanks,
> Nickle
> 
> +
> +    Status = EFI_NOT_FOUND;
> +
> +    // Search for the starting MSG_USB_DP node.
> +    ThisUsbDevicePath = UsbDevicePath;
> +    if ((DevicePathType (ThisUsbDevicePath) != MESSAGING_DEVICE_PATH)
> ||
> +        (DevicePathSubType (ThisUsbDevicePath) != MSG_USB_DP))
> +    {
> +      ThisUsbDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePath);
> +      if (ThisUsbDevicePath == NULL) {
> +        continue;
> +      }
> +    }
> +
> +    if ((DevicePathType (ThisDevicePath) != MESSAGING_DEVICE_PATH) ||
> +        (DevicePathSubType (ThisDevicePath) != MSG_USB_DP))
> +    {
> +      ThisDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePath);
> +      if (ThisDevicePath == NULL) {
> +        continue;
> +      }
> +    }
> +
> +    // Search for the ending MSG_USB_DP node.
> +    ThisDevicePathEnd    = ThisDevicePath;
> +    ThisUsbDevicePathEnd = ThisUsbDevicePath;
> +    while (TRUE) {
> +      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisDevicePathEnd);
> +      if (TempDevicePath == NULL) {
> +        break;
> +      }
> +
> +      ThisDevicePathEnd = TempDevicePath;
> +    }
> +
> +    while (TRUE) {
> +      TempDevicePath = UsbNicGetNextMsgUsbDp (ThisUsbDevicePathEnd);
> +      if (TempDevicePath == NULL) {
> +        break;
> +      }
> +
> +      ThisUsbDevicePathEnd = TempDevicePath;
> +    }
> +
> +    // Compare these two device paths
> +    Length = (UINT16)((UINTN)(UINT8 *)ThisDevicePathEnd +
> DevicePathNodeLength (ThisDevicePathEnd) - (UINTN)(UINT8
> *)ThisDevicePath);
> +    if (Length != ((UINTN)(UINT8 *)ThisUsbDevicePathEnd +
> DevicePathNodeLength (ThisUsbDevicePathEnd) - (UINTN)(UINT8
> *)ThisUsbDevicePath)) {
> +      continue;
> +    }
> +
> +    if (CompareMem (
> +          (VOID *)ThisDevicePath,
> +          (VOID *)ThisUsbDevicePath,
> +          Length
> +          ) == 0)
> +    {
> +      Status = EFI_SUCCESS;
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "EFI handle with the
> correct UsbIo is found at #%d instance of UsbIo.\n", Index));
> +      break;
> +    }
> +  }
> +
> +  if (Status == EFI_SUCCESS) {
> +    // Locate UsbIo from this handle.
> +    Status = gBS->HandleProtocol (
> +                    *(HandleBuffer + Index),
> +                    &gEfiUsbIoProtocolGuid,
> +                    (VOID **)UsbIo
> +                    );
> +    return Status;
> +  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  This function identifies if the USB NIC is exposed by BMC as
> +  the host-BMC channel.
> +
> +  @param[in] Handle          This is the EFI handle with SNP installed.
> +  @param[in] UsbDevicePath   USB device path.
> +
> +  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
> +  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
> +                               on the existing SNP handle.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +IdentifyUsbNicBmcChannel (
> +  IN EFI_HANDLE                Handle,
> +  IN EFI_DEVICE_PATH_PROTOCOL  *UsbDevicePath
> +  )
> +{
> +  UINTN                            Index;
> +  EFI_STATUS                       Status;
> +  EFI_SIMPLE_NETWORK_PROTOCOL      *Snp;
> +  EFI_USB_IO_PROTOCOL              *UsbIo;
> +  HOST_INTERFACE_BMC_USB_NIC_INFO  *BmcUsbNic;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));  Status =
> + gBS->HandleProtocol (
> +                  Handle,
> +                  &gEfiSimpleNetworkProtocolGuid,
> +                  (VOID **)&Snp
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "    Failed to locate SNP.\n"));
> +    return Status;
> +  }
> +
> +  Status = UsbNicSearchUsbIo (UsbDevicePath, &UsbIo);  if (EFI_ERROR
> + (Status)) {
> +    DEBUG ((DEBUG_ERROR, "    Failed to find USBIO.\n"));
> +    return Status;
> +  }
> +
> +  // Get the MAC address of this SNP instance.
> +  BmcUsbNic = AllocateZeroPool (sizeof
> + (HOST_INTERFACE_BMC_USB_NIC_INFO));
> +  if (BmcUsbNic == NULL) {
> +    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for
> HOST_INTERFACE_BMC_USB_NIC_INFO.\n"));
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  InitializeListHead (&BmcUsbNic->NextInstance);
> + BmcUsbNic->MacAddressSize = Snp->Mode->HwAddressSize;
> +  BmcUsbNic->MacAddress     = AllocateZeroPool (sizeof (BmcUsbNic-
> >MacAddressSize));
> +  if (BmcUsbNic->MacAddress == NULL) {
> +    DEBUG ((DEBUG_ERROR, "    Failed to allocate memory for HW MAC
> addresss.\n"));
> +    FreePool (BmcUsbNic);
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  CopyMem (
> +    (VOID *)BmcUsbNic->MacAddress,
> +    (VOID *)&Snp->Mode->CurrentAddress,
> +    BmcUsbNic->MacAddressSize
> +    );
> +  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    MAC address (in size %d)
> for this SNP instance:\n      ", BmcUsbNic->MacAddressSize));
> +  for (Index = 0; Index < BmcUsbNic->MacAddressSize; Index++) {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%02x ",
> + *(BmcUsbNic->MacAddress + Index)));  }
> +
> +  DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "\n"));
> +  BmcUsbNic->ThisSnp   = Snp;
> +  BmcUsbNic->ThisUsbIo = UsbIo;
> +
> +  Status = HostInterfaceIpmiCheckMacAddress (BmcUsbNic);  if (Status ==
> + EFI_SUCCESS) {
> +    BmcUsbNic->IsExposedByBmc = TRUE;
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC
> is found.\n"));
> +  } else {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    BMC exposed USB NIC
> is not found.\n"));
> +  }
> +
> +  InsertTailList (&mBmcUsbNic, &BmcUsbNic->NextInstance);
> +  return Status;
> +}
> +
> +/**
> +  This function checks if the USB NIC exposed by BMC
> +  on each handle has SNP protocol installed on it.
> +
> +  @param[in] HandleNumer    Number of handles to check.
> +  @param[in] HandleBuffer   Handles buffer.
> +
> +  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
> +  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
> +                               on the existing SNP handle.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +CheckBmcUsbNicOnHandles (
> +  IN  UINTN       HandleNumer,
> +  IN  EFI_HANDLE  *HandleBuffer
> +  )
> +{
> +  UINTN                     Index;
> +  EFI_STATUS                Status;
> +  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
> +  BOOLEAN                   GotOneUsbNIc;
> +
> +  if ((HandleNumer == 0) || (HandleBuffer == NULL)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry, #%d SNP handle\n", __FUNCTION__,
> + HandleNumer));
> +
> +  GotOneUsbNIc = FALSE;
> +  for (Index = 0; Index < HandleNumer; Index++) {
> +    Status = gBS->HandleProtocol (
> +                    *(HandleBuffer + Index),
> +                    &gEfiDevicePathProtocolGuid,
> +                    (VOID **)&DevicePath
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "    Failed to locate SNP on %d handle.\n",
> __FUNCTION__, Index));
> +      continue;
> +    }
> +
> +    // Check if this is an BMC exposed USB NIC device.
> +    while (TRUE) {
> +      if ((DevicePath->Type == MESSAGING_DEVICE_PATH) && (DevicePath-
> >SubType == MSG_USB_DP)) {
> +        Status = IdentifyUsbNicBmcChannel (*(HandleBuffer + Index),
> DevicePath);
> +        if (!EFI_ERROR (Status)) {
> +          GotOneUsbNIc = TRUE;
> +          break;
> +        }
> +      }
> +
> +      DevicePath = NextDevicePathNode (DevicePath);
> +      if (IsDevicePathEnd (DevicePath)) {
> +        break;
> +      }
> +    }
> +  }
> +
> +  if (GotOneUsbNIc) {
> +    return EFI_SUCCESS;
> +  }
> +
> +  return EFI_NOT_FOUND;
> +}
> +
> +/**
> +  This function checks if the USB NIC exposed by BMC
> +  is already connected.
> +
> +  @param[in] Registration      Locate SNP protocol from the notification
> +                               registeration key.
> +                               NULL means locate SNP protocol from the existing
> +                               handles.
> +
> +  @retval EFI_SUCCESS          Yes, USB NIC exposed by BMC is found.
> +  @retval EFI_NOT_FOUND        No, USB NIC exposed by BMC is not found
> +                               on the existing SNP handle.
> +  @retval Others               Other errors.
> +
> +**/
> +EFI_STATUS
> +CheckBmcUsbNic (
> +  VOID  *Registration
> +  )
> +{
> +  EFI_STATUS  Status;
> +  EFI_HANDLE  Handle;
> +  UINTN       BufferSize;
> +  EFI_HANDLE  *HandleBuffer;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry, the registration key - 0x%08x.\n",
> + __FUNCTION__, Registration));
> +
> +  Handle     = NULL;
> +  Status     = EFI_SUCCESS;
> +  BufferSize = 0;
> +
> +  Status = gBS->LocateHandle (
> +                  Registration == NULL ? ByProtocol : ByRegisterNotify,
> +                  &gEfiSimpleNetworkProtocolGuid,
> +                  Registration,
> +                  &BufferSize,
> +                  NULL
> +                  );
> +  if (Status == EFI_BUFFER_TOO_SMALL) {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    %d SNP protocol
> instances.\n", BufferSize/sizeof (EFI_HANDLE)));
> +    HandleBuffer = AllocateZeroPool (BufferSize);
> +    if (HandleBuffer == NULL) {
> +      DEBUG ((DEBUG_ERROR, "    Falied to allocate buffer for the
> handles.\n"));
> +      return EFI_OUT_OF_RESOURCES;
> +    }
> +
> +    Status = gBS->LocateHandle (
> +                    Registration == NULL ? ByProtocol : ByRegisterNotify,
> +                    &gEfiSimpleNetworkProtocolGuid,
> +                    Registration,
> +                    &BufferSize,
> +                    HandleBuffer
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "    Falied to locate SNP protocol handles.\n"));
> +      FreePool (HandleBuffer);
> +      return Status;
> +    }
> +  } else if (EFI_ERROR (Status)) {
> +    return Status;
> +  }
> +
> +  // Check USB NIC on handles.
> +  Status = CheckBmcUsbNicOnHandles (BufferSize/sizeof (EFI_HANDLE),
> + HandleBuffer);  if (!EFI_ERROR (Status)) {
> +    // Retrieve the rest of BMC USB NIC information for Redfish over IP
> information
> +    // and USB Network Interface V2.
> +    Status = RetrievedBmcUsbNicInfo ();
> +    if (!EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "    Install protocol to
> notify the platform Redfish Host Interface information is ready.\n"));
> +      Status = gBS->InstallProtocolInterface (
> +                      &Handle,
> +                      &mPlatformHostInterfaceBmcUsbNicReadinessGuid,
> +                      EFI_NATIVE_INTERFACE,
> +                      NULL
> +                      );
> +      if (EFI_ERROR (Status)) {
> +        DEBUG ((DEBUG_ERROR, "    Install protocol fail %r.\n", Status));
> +      }
> +    }
> +  }
> +
> +  FreePool (HandleBuffer);
> +  return Status;
> +}
> +
> +/**
> +  Notification event of SNP readiness.
> +
> +  @param[in]  Event                 Event whose notification function is being
> invoked.
> +  @param[in]  Context               The pointer to the notification function's
> context,
> +                                    which is implementation-dependent.
> +
> +**/
> +VOID
> +EFIAPI
> +PlatformHostInterfaceSnpCallback (
> +  IN  EFI_EVENT  Event,
> +  IN  VOID       *Context
> +  )
> +{
> +  DEBUG ((DEBUG_INFO, "%a: Entry.\n", __FUNCTION__));
> +
> +  CheckBmcUsbNic (mPlatformHostInterfaceSnpRegistration);
> +  return;
> +}
> +
> +/**
> +  Get the EFI protocol GUID installed by platform library which
> +  indicates the necessary information is ready for building
> +  SMBIOS 42h record.
> +
> +  @param[out] InformationReadinessGuid  Pointer to retrive the protocol
> +                                        GUID.
> +
> +  @retval EFI_SUCCESS          Notification is required for building up
> +                               SMBIOS type 42h record.
> +  @retval EFI_UNSUPPORTED      Notification is not required for building up
> +                               SMBIOS type 42h record.
> +  @retval EFI_ALREADY_STARTED  Platform host information is already ready.
> +  @retval Others               Other errors.
> +**/
> +EFI_STATUS
> +RedfishPlatformHostInterfaceNotification (
> +  OUT EFI_GUID  **InformationReadinessGuid
> +  )
> +{
> +  EFI_STATUS  Status;
> +
> +  DEBUG ((DEBUG_INFO, "%a: Entry\n", __FUNCTION__));
> +
> +  *InformationReadinessGuid = NULL;
> +  InitializeListHead (&mBmcUsbNic);
> +  InitializeListHead (&mBmcIpmiLan);
> +
> +  //
> +  // Check if USB NIC exposed by BMC is already  // connected.
> +  //
> +  Status = CheckBmcUsbNic (NULL);
> +  if (!EFI_ERROR (Status)) {
> +    return EFI_ALREADY_STARTED;
> +  }
> +
> +  if (Status == EFI_NOT_FOUND) {
> +    DEBUG ((DEBUG_REDFISH_HOST_INTERFACE, "%a: BMC USB NIC is not
> + found. Register the notification.\n", __FUNCTION__));
> +
> +    // Register the notification of SNP installation.
> +    Status = gBS->CreateEvent (
> +                    EVT_NOTIFY_SIGNAL,
> +                    TPL_CALLBACK,
> +                    PlatformHostInterfaceSnpCallback,
> +                    NULL,
> +                    &mPlatformHostInterfaceSnpEvent
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "%a: Fail to create event for the installation of
> SNP protocol.", __FUNCTION__));
> +      return Status;
> +    }
> +
> +    Status = gBS->RegisterProtocolNotify (
> +                    &gEfiSimpleNetworkProtocolGuid,
> +                    mPlatformHostInterfaceSnpEvent,
> +                    &mPlatformHostInterfaceSnpRegistration
> +                    );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "%a: Fail to register event for the installation of
> SNP protocol.", __FUNCTION__));
> +      return Status;
> +    }
> +
> +    *InformationReadinessGuid =
> &mPlatformHostInterfaceBmcUsbNicReadinessGuid;
> +    return EFI_SUCCESS;
> +  }
> +
> +  DEBUG ((DEBUG_ERROR, "%a: Something wrong when look for BMC USB
> +NIC.\n", __FUNCTION__));
> +  return Status;
> +}
> --
> 2.37.1.windows.1

[PATCH 2/3] RedfishPkg: Update Redfish DSC

[Chang, Abner]

From: Abner Chang <abner.chang@amd.com>

Update Redfish DSC for
PlatformHostInterfaceBmcUsbNicLib.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/RedfishPkg.dsc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/RedfishPkg/RedfishPkg.dsc b/RedfishPkg/RedfishPkg.dsc
index cf25b63cc29..223ab72c1db 100644
--- a/RedfishPkg/RedfishPkg.dsc
+++ b/RedfishPkg/RedfishPkg.dsc
@@ -3,6 +3,7 @@
 #
 # Copyright (c) 2019 - 2021, Intel Corporation. All rights reserved.<BR>
 # (C) Copyright 2021 Hewlett-Packard Enterprise Development LP.
+# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -34,6 +35,7 @@
   DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   RedfishPlatformHostInterfaceLib|RedfishPkg/Library/PlatformHostInterfaceLibNull/PlatformHostInterfaceLibNull.inf
+  RedfishPlatformHostInterfaceLib|RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
   HttpLib|NetworkPkg/Library/DxeHttpLib/DxeHttpLib.inf
   HttpIoLib|NetworkPkg/Library/DxeHttpIoLib/DxeHttpIoLib.inf
   NetLib|NetworkPkg/Library/DxeNetLib/DxeNetLib.inf
@@ -41,6 +43,10 @@
   RedfishPlatformCredentialLib|RedfishPkg/Library/PlatformCredentialLibNull/PlatformCredentialLibNull.inf
   RedfishContentCodingLib|RedfishPkg/Library/RedfishContentCodingLibNull/RedfishContentCodingLibNull.inf
 
+  # NULL instance of IPMI related library.
+  IpmiLib|MdeModulePkg/Library/BaseIpmiLibNull/BaseIpmiLibNull.inf
+  IpmiCommandLib|MdeModulePkg/Library/BaseIpmiCommandLibNull/BaseIpmiCommandLibNull.inf
+
 [LibraryClasses.ARM, LibraryClasses.AARCH64]
   #
   # This library provides the instrinsic functions generated by a given compiler.
@@ -51,6 +57,7 @@
 
 [Components]
   RedfishPkg/Library/PlatformHostInterfaceLibNull/PlatformHostInterfaceLibNull.inf
+  RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
   RedfishPkg/Library/PlatformCredentialLibNull/PlatformCredentialLibNull.inf
   RedfishPkg/Library/RedfishContentCodingLibNull/RedfishContentCodingLibNull.inf
   RedfishPkg/Library/DxeRestExLib/DxeRestExLib.inf
-- 
2.37.1.windows.1

Re: [PATCH 2/3] RedfishPkg: Update Redfish DSC

[Nickle Wang]

Reviewed-by: Nickle Wang <nicklew@nvidia.com>

Regards,
Nickle

-----Original Message-----
From: abner.chang@amd.com <abner.chang@amd.com> 
Sent: Thursday, March 9, 2023 11:41 PM
To: devel@edk2.groups.io
Cc: Nickle Wang <nicklew@nvidia.com>; Igor Kulchytskyy <igork@ami.com>
Subject: [PATCH 2/3] RedfishPkg: Update Redfish DSC

External email: Use caution opening links or attachments


From: Abner Chang <abner.chang@amd.com>

Update Redfish DSC for
PlatformHostInterfaceBmcUsbNicLib.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/RedfishPkg.dsc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/RedfishPkg/RedfishPkg.dsc b/RedfishPkg/RedfishPkg.dsc index cf25b63cc29..223ab72c1db 100644
--- a/RedfishPkg/RedfishPkg.dsc
+++ b/RedfishPkg/RedfishPkg.dsc
@@ -3,6 +3,7 @@
 #
 # Copyright (c) 2019 - 2021, Intel Corporation. All rights reserved.<BR>  # (C) Copyright 2021 Hewlett-Packard Enterprise Development LP.
+# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -34,6 +35,7 @@
   DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   RedfishPlatformHostInterfaceLib|RedfishPkg/Library/PlatformHostInterfaceLibNull/PlatformHostInterfaceLibNull.inf
+  
+ RedfishPlatformHostInterfaceLib|RedfishPkg/Library/PlatformHostInterfa
+ ceBmcUsbNicLib/PlatformHostInterfaceBmcUsbNicLib.inf
   HttpLib|NetworkPkg/Library/DxeHttpLib/DxeHttpLib.inf
   HttpIoLib|NetworkPkg/Library/DxeHttpIoLib/DxeHttpIoLib.inf
   NetLib|NetworkPkg/Library/DxeNetLib/DxeNetLib.inf
@@ -41,6 +43,10 @@
   RedfishPlatformCredentialLib|RedfishPkg/Library/PlatformCredentialLibNull/PlatformCredentialLibNull.inf
   RedfishContentCodingLib|RedfishPkg/Library/RedfishContentCodingLibNull/RedfishContentCodingLibNull.inf

+  # NULL instance of IPMI related library.
+  IpmiLib|MdeModulePkg/Library/BaseIpmiLibNull/BaseIpmiLibNull.inf
+  
+ IpmiCommandLib|MdeModulePkg/Library/BaseIpmiCommandLibNull/BaseIpmiCom
+ mandLibNull.inf
+
 [LibraryClasses.ARM, LibraryClasses.AARCH64]
   #
   # This library provides the instrinsic functions generated by a given compiler.
@@ -51,6 +57,7 @@

 [Components]
   RedfishPkg/Library/PlatformHostInterfaceLibNull/PlatformHostInterfaceLibNull.inf
+  
+ RedfishPkg/Library/PlatformHostInterfaceBmcUsbNicLib/PlatformHostInter
+ faceBmcUsbNicLib.inf
   RedfishPkg/Library/PlatformCredentialLibNull/PlatformCredentialLibNull.inf
   RedfishPkg/Library/RedfishContentCodingLibNull/RedfishContentCodingLibNull.inf
   RedfishPkg/Library/DxeRestExLib/DxeRestExLib.inf
--
2.37.1.windows.1

[PATCH 3/3] RedfishPkg: Update Readme.md

[Chang, Abner]

From: Abner Chang <abner.chang@amd.com>

Update readme.md and add figures to delineate the
relationship of edk2 Redfish, USB NIC and IPMI.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/Readme.md                          | 112 +++++-
 .../Documents/Media/BmcExposedUsbNic.svg      | 283 +++++++++++++++
 .../Media/EmualtorPlatformLibrary.svg         | 286 +++++++++++++++
 .../Media/PlatformWihtBmcLibrary.svg          | 328 ++++++++++++++++++
 4 files changed, 1001 insertions(+), 8 deletions(-)
 create mode 100644 RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
 create mode 100644 RedfishPkg/Documents/Media/EmualtorPlatformLibrary.svg
 create mode 100644 RedfishPkg/Documents/Media/PlatformWihtBmcLibrary.svg

diff --git a/RedfishPkg/Readme.md b/RedfishPkg/Readme.md
index a0e9f0892c2..7defe78eb1e 100644
--- a/RedfishPkg/Readme.md
+++ b/RedfishPkg/Readme.md
@@ -50,12 +50,107 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
   * **RedfishPkg\Library\JsonLib** ***[[14]](#[0])***
   This is the wrapper of open source project ***[Jansson](https://digip.org/jansson)***,  which is the library that provides APIs to manipulate JSON payload.
 
-## Platform Components for EDK2 EmulatorPkg:
-  * **RedfishPlatformCredentialLib**
-  the EDK2 Emulator platform implementation of acquiring credential to build up the communication between UEFI firmware and Redfish service. ***[[10]](#[0])***
-
-  * **RedfishPlatformHostInterfaceLib**
-  EDK2 Emulator platform implementation which provides the information of building up SMBIOS type 42h record. ***[[11]](#[0])***
+## Platform Components
+### **EDK2 EmulatorPkg**
+![EDK2 EmulatorPkg Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/EmualtorPlatformLibrary.svg?raw=true)
+
+  * **RedfishPlatformCredentialLib** <br>
+    The EDK2 Emulator platform implementation of acquiring credential to build up the communication between
+    UEFI firmware and Redfish service. ***[[10]](#[0])***
+
+    The Redfish credential is hardcoded in the EmulatorPkg RedfishPlatformCredentialLib. The credential is
+    used to access to the Redfish service hosted by [Redfish Profile Simulator](https://github.com/DMTF/Redfish-Profile-Simulator).
+
+  * **RedfishPlatformHostInterfaceLib**<br>
+    EDK2 Emulator platform implementation which provides the information of building up SMBIOS type 42h
+    record. ***[[11]](#[0])***
+
+    EmulatorPkg RedfishPlatformHostInterfaceLib library consumes the EFI Variable which is created
+    by [RedfishPlatformConfig EFI application](https://github.com/tianocore/edk2/tree/master/EmulatorPkg/Application/RedfishPlatformConfig). RedfishPlatformConfig EFI application stores not all of SMBIOS
+    Type42 record information but the necessary network properties of Redfish Host Interface in EFI
+    Variable.
+
+### **Platform with BMC and the BMC-Exposed USB Network Device**
+![Platform with BMC Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg?raw=true)
+
+Server platform with BMC as the server management entity may expose the [USB Network Interface Device (NIC)](https://www.usb.org/document-library/class-definitions-communication-devices-12)
+to the platform, which is so called the in-band host-BMC transport interface. The USB NIC exposed by BMC is
+usually a link-local network device which has two network endpoints at host and BMC ends. The endpoint at
+host side is connected to the platform USB port, and it is enumerated by edk2 USB BUS driver. The edk2 USB
+NIC driver then produces the **EFI Network Interface Identifier Protocol**
+*(EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_GUID_31)* and connected by EFI Simple
+Network Protocol (SNP) driver and the upper layer edk2 network drivers. The applications can then utilize
+the network stack built up on top of USB NIC to communicate with Redfish service hosted by BMC.<br>
+BMC-exposed USB NIC is mainly designed for the communication between host and BMC-hosted Redfish service.
+BMC-exposed USB NIC can be public to host through [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) and discovered by edk2 Redfish discovery
+driver. The [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) describes the dedicated host interface between host and
+BMC. The specification follows the [SMBIOS Type 42 format](https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf) and defines the host interface as:
+- Network Host Interface type (40h)
+- Redfish over IP Protocol (04h)
+
+<br>
+
+![Platform BMC Library Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/PlatformWihtBmcLibrary.svg?raw=true)
+
+  * **RedfishPlatformCredentialLib** <br>
+RedfishPlatformCredentialLib library instance on the platform with BMC uses Redfish Credential
+Bootstrapping IPMI commands defined in [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) to acquire the Redfish credential from BMC. edk2
+Redfish firmware then uses this credential to access to Redfish service hosted by BMC.
+
+  * **RedfishPlatformHostInterfaceLib** <br>
+BMC-exposed USB NIC, a IPMI Message channel is reported by BMC as a "IPMB-1.0" protocol and "802.3 LAN"
+medium channel. edk2 firmware can issue a series of IPMI commands to acquire the channel
+application information (NetFn App), transport network properties (NetFn Transport) and other necessary
+information to build up the SMBIOS type 42h record. <be>
+In order to recognize the specific BMC-exposed USB NIC in case the platform has more than one USB NIC
+devices attached, the MAC address specified in the EFI Device Path Protocol of SNP EFI handle is used to
+match with the MAC address of IPMI message channel. Due to the network information such as the MAC
+address, IP address, Subnet mask and Gateway are assigned by BMC, edk2 Redfish implementation needs a
+programmatic way to recognize the BMC-exposed USB NIC.
+
+    *  **MAC address:** Searching for the BMC-exposed USB NIC<br>
+    The last byte of host-end USB NIC MAC address is the last byte of BMC-end USB NIC MAC address minus 1.
+    RedfishPlatformHostInterfaceLib issues the NetFn Transport IPMI command to get the MAC address of each
+    channel and checks them with the MAC address specified in the EFI Device Path Protocol.<br>
+
+          **_For example:_**<br>
+          BMC-end USB NIC MAC address: 11-22-33-44-55-00<br>
+          Host-end USB NIC MAC address: 11-22-33-44-55-ff
+
+    *  **IP Address:** Acquiring the host-end USB NIC IP Address<br>
+    The last byte of host-end USB NIC IPv4 address is the last byte of BMC-end USB NIC IPv4 address minus 1.
+
+          **_For example:_**<br>
+          BMC-end USB NIC IPv4 address: 165.10.0.10<br>
+          Host-end USB NIC IPv4 address: 165.10.0.9
+
+    *  **Other Network Properties**: <br>
+    Due to the host-end USB NIC and BMC-end USB NIC is a link-local network. Both of them have the same
+    network properties such as subnet mask and gateway. RedfishPlatformHostInterfaceLib issues the NetFn
+    Transport IPMI command to get the network properties of BMC-end USB NIC and apply it on host-end USB
+    NIC.
+
+  * **IPMI Commands that Used to Build up Redfish Host Interface**
+
+    Standard IPMI commands those are used to build up the Redfish Host Interface for BMC-exposed USB NIC.
+    The USB NIC exposed by BMC must be reported as one of the message channels as 802.3 LAN/IPMB 1.0 message
+    channel.
+
+    | IPMI NetFn | IPMI Command| Purpose | Corresponding Host Interface Field|
+    |------------|-------------|---------|-----------------------------------|
+    | App<br>(0x06) | 0x42 | Check the message channel's medium type and protocol.<br>Medium: 802.3 LAN<br>Protocol: IPMB 1.0| None|
+    | Transport<br>(0x0C) | 0x02 | Get MAC address of message channel. Used to match with the MAC address populated in EFI Device Path of network device| None|
+    | Group Ext<br>(0x2C) | Group Extension ID: 0x52<br>Command: 0x02 | Check if Redfish bootstrap credential is supported or not.| In Device Descriptor Data, Credential Bootstrapping Handle|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x04 | Get BMC-end message channel IP address source| In Protocol Specific Record Data<br>- Host IP Assignment Type<br>- Redfish Service IP Discovery Type<br>- Generate the Host-side IP address|.
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x03 | Get BMC-end message channel IPv4 address| In Protocol Specific Record Data<br>- Host IP Address Format<br>- Host IP Address|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x06 | Get BMC-end message channel IPv4 subnet mask| In Protocol Specific Record Data<br>- Host IP Mask<br>- Redfish Service IP Mask|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x12 | Get BMC-end message channel gateway IP address| None, used to configure edk2 network configuration|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x14 | Get BMC-end message channel VLAN ID| In Protocol Specific Record Data<br> Redfish Service VLAN ID|
+
+  **__NOTE__**
+```
+Current RedfishPlatformHostInterfaceLib implementation of BMC-exposed USB NIC can only support IPv4 address format.
+```
 
 ## Miscellaneous:
 
@@ -65,7 +160,6 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
     For example, run shell command "RedfishPlatformConfig.efi -s 192.168.10.101 255.255.255.0 192.168.10.123 255.255.255.0", which means
       the source IP address is 192.168.10.101, and the Redfish Server IP address is 192.168.10.123.
    ```
-
    * **Redfish Profile Simulator**
    Refer to [Redfish Profile Simulator](https://github.com/DMTF/Redfish-Profile-Simulator) to set up the Redfish service.
    We are also in the progress to contribute bug fixes and enhancements to the mainstream Redfish Profile Simulator in order to incorporate with EDK2 Redfish solution.
@@ -121,7 +215,9 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
 1. [DSP0270](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) - Redfish Host Interface Specification, 1.3.0
 2. [DSP0266](https://www.dmtf.org/sites/default/files/standards/documents/DSP0266_1.12.0.pdf) - Redfish Specification, 1.12.0
 3. Redfish Schemas - https://redfish.dmtf.org/schemas/v1/
-4. UEFI Specification - http://uefi.org/specifications
+4. SMBIOS - https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
+5. USB CDC - https://www.usb.org/document-library/class-definitions-communication-devices-12
+6. UEFI Specification - http://uefi.org/specifications
 
 ## The Contributors
 Thanks to the below predecessors who contributed to the UEFI EDK2 Redfish Prove of Concept code.\
diff --git a/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg b/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
new file mode 100644
index 00000000000..c7088eb8d54
--- /dev/null
+++ b/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
@@ -0,0 +1,283 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.2" width="172.72mm" height="88.9mm" viewBox="0 0 17272 8890" preserveAspectRatio="xMidYMid" fill-rule="evenodd" stroke-width="28.222" stroke-linejoin="round" xmlns="http://www.w3.org/2000/svg" xmlns:ooo="http://xml.openoffice.org/svg/export" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:presentation="http://sun.com/xmlns/staroffice/presentation" xmlns:smil="http://www.w3.org/2001/SMIL20/" xmlns:anim="urn:oasis:names:tc:opendocument:xmlns:animation:1.0" xml:space="preserve">
+ <defs class="ClipPathGroup">
+  <clipPath id="presentation_clip_path" clipPathUnits="userSpaceOnUse">
+   <rect x="0" y="0" width="17272" height="8890"/>
+  </clipPath>
+  <clipPath id="presentation_clip_path_shrink" clipPathUnits="userSpaceOnUse">
+   <rect x="17" y="8" width="17238" height="8873"/>
+  </clipPath>
+ </defs>
+ <defs>
+  <font id="EmbeddedFont_1" horiz-adv-x="2048">
+   <font-face font-family="Liberation Sans embedded" units-per-em="2048" font-weight="normal" font-style="normal" ascent="1852" descent="423"/>
+   <missing-glyph horiz-adv-x="2048" d="M 0,0 L 2047,0 2047,2047 0,2047 0,0 Z"/>
+   <glyph unicode="w" horiz-adv-x="1509" d="M 1174,0 L 965,0 776,765 740,934 C 734,904 725,861 712,805 699,748 631,480 508,0 L 300,0 -3,1082 175,1082 358,347 C 363,331 377,265 401,149 L 418,223 644,1082 837,1082 1026,339 1072,149 1103,288 1308,1082 1484,1082 1174,0 Z"/>
+   <glyph unicode="v" horiz-adv-x="1033" d="M 613,0 L 400,0 7,1082 199,1082 437,378 C 446,351 469,272 506,141 L 541,258 580,376 826,1082 1017,1082 613,0 Z"/>
+   <glyph unicode="t" horiz-adv-x="531" d="M 554,8 C 495,-8 434,-16 372,-16 228,-16 156,66 156,229 L 156,951 31,951 31,1082 163,1082 216,1324 336,1324 336,1082 536,1082 536,951 336,951 336,268 C 336,216 345,180 362,159 379,138 408,127 450,127 474,127 509,132 554,141 L 554,8 Z"/>
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+       </g>
+      </g>
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+       </g>
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+      <g class="com.sun.star.drawing.LineShape">
+       <g id="id25">
+        <rect class="BoundingBox" stroke="none" fill="none" x="20059" y="4204" width="277" height="971"/>
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+        <path fill="rgb(0,0,0)" stroke="none" d="M 20335,4898 L 20197,5174 20059,4898 20335,4898 Z"/>
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+       </g>
+      </g>
+     </g>
+    </g>
+   </g>
+  </g>
+ </g>
+</svg>
-- 
2.37.1.windows.1

Re: [edk2-devel] [PATCH 3/3] RedfishPkg: Update Readme.md

[Nickle Wang]

Thanks for addressing my offline comments.

Reviewed-by: Nickle Wang <nicklew@nvidia.com>

Regards,
Nickle

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Chang, Abner via groups.io
Sent: Thursday, March 9, 2023 11:41 PM
To: devel@edk2.groups.io
Cc: Nickle Wang <nicklew@nvidia.com>; Igor Kulchytskyy <igork@ami.com>
Subject: [edk2-devel] [PATCH 3/3] RedfishPkg: Update Readme.md

External email: Use caution opening links or attachments


From: Abner Chang <abner.chang@amd.com>

Update readme.md and add figures to delineate the
relationship of edk2 Redfish, USB NIC and IPMI.

Signed-off-by: Abner Chang <abner.chang@amd.com>
Cc: Nickle Wang <nicklew@nvidia.com>
Cc: Igor Kulchytskyy <igork@ami.com>
---
 RedfishPkg/Readme.md                          | 112 +++++-
 .../Documents/Media/BmcExposedUsbNic.svg      | 283 +++++++++++++++
 .../Media/EmualtorPlatformLibrary.svg         | 286 +++++++++++++++
 .../Media/PlatformWihtBmcLibrary.svg          | 328 ++++++++++++++++++
 4 files changed, 1001 insertions(+), 8 deletions(-)
 create mode 100644 RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
 create mode 100644 RedfishPkg/Documents/Media/EmualtorPlatformLibrary.svg
 create mode 100644 RedfishPkg/Documents/Media/PlatformWihtBmcLibrary.svg

diff --git a/RedfishPkg/Readme.md b/RedfishPkg/Readme.md
index a0e9f0892c2..7defe78eb1e 100644
--- a/RedfishPkg/Readme.md
+++ b/RedfishPkg/Readme.md
@@ -50,12 +50,107 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
   * **RedfishPkg\Library\JsonLib** ***[[14]](#[0])***
   This is the wrapper of open source project ***[Jansson](https://digip.org/jansson)***,  which is the library that provides APIs to manipulate JSON payload.

-## Platform Components for EDK2 EmulatorPkg:
-  * **RedfishPlatformCredentialLib**
-  the EDK2 Emulator platform implementation of acquiring credential to build up the communication between UEFI firmware and Redfish service. ***[[10]](#[0])***
-
-  * **RedfishPlatformHostInterfaceLib**
-  EDK2 Emulator platform implementation which provides the information of building up SMBIOS type 42h record. ***[[11]](#[0])***
+## Platform Components
+### **EDK2 EmulatorPkg**
+![EDK2 EmulatorPkg Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/EmualtorPlatformLibrary.svg?raw=true)
+
+  * **RedfishPlatformCredentialLib** <br>
+    The EDK2 Emulator platform implementation of acquiring credential to build up the communication between
+    UEFI firmware and Redfish service. ***[[10]](#[0])***
+
+    The Redfish credential is hardcoded in the EmulatorPkg RedfishPlatformCredentialLib. The credential is
+    used to access to the Redfish service hosted by [Redfish Profile Simulator](https://github.com/DMTF/Redfish-Profile-Simulator).
+
+  * **RedfishPlatformHostInterfaceLib**<br>
+    EDK2 Emulator platform implementation which provides the information of building up SMBIOS type 42h
+    record. ***[[11]](#[0])***
+
+    EmulatorPkg RedfishPlatformHostInterfaceLib library consumes the EFI Variable which is created
+    by [RedfishPlatformConfig EFI application](https://github.com/tianocore/edk2/tree/master/EmulatorPkg/Application/RedfishPlatformConfig). RedfishPlatformConfig EFI application stores not all of SMBIOS
+    Type42 record information but the necessary network properties of Redfish Host Interface in EFI
+    Variable.
+
+### **Platform with BMC and the BMC-Exposed USB Network Device**
+![Platform with BMC Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg?raw=true)
+
+Server platform with BMC as the server management entity may expose the [USB Network Interface Device (NIC)](https://www.usb.org/document-library/class-definitions-communication-devices-12)
+to the platform, which is so called the in-band host-BMC transport interface. The USB NIC exposed by BMC is
+usually a link-local network device which has two network endpoints at host and BMC ends. The endpoint at
+host side is connected to the platform USB port, and it is enumerated by edk2 USB BUS driver. The edk2 USB
+NIC driver then produces the **EFI Network Interface Identifier Protocol**
+*(EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_GUID_31)* and connected by EFI Simple
+Network Protocol (SNP) driver and the upper layer edk2 network drivers. The applications can then utilize
+the network stack built up on top of USB NIC to communicate with Redfish service hosted by BMC.<br>
+BMC-exposed USB NIC is mainly designed for the communication between host and BMC-hosted Redfish service.
+BMC-exposed USB NIC can be public to host through [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) and discovered by edk2 Redfish discovery
+driver. The [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) describes the dedicated host interface between host and
+BMC. The specification follows the [SMBIOS Type 42 format](https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf) and defines the host interface as:
+- Network Host Interface type (40h)
+- Redfish over IP Protocol (04h)
+
+<br>
+
+![Platform BMC Library Figure](https://github.com/tianocore/edk2/blob/master/RedfishPkg/Documents/Media/PlatformWihtBmcLibrary.svg?raw=true)
+
+  * **RedfishPlatformCredentialLib** <br>
+RedfishPlatformCredentialLib library instance on the platform with BMC uses Redfish Credential
+Bootstrapping IPMI commands defined in [Redfish Host Interface Specification](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) to acquire the Redfish credential from BMC. edk2
+Redfish firmware then uses this credential to access to Redfish service hosted by BMC.
+
+  * **RedfishPlatformHostInterfaceLib** <br>
+BMC-exposed USB NIC, a IPMI Message channel is reported by BMC as a "IPMB-1.0" protocol and "802.3 LAN"
+medium channel. edk2 firmware can issue a series of IPMI commands to acquire the channel
+application information (NetFn App), transport network properties (NetFn Transport) and other necessary
+information to build up the SMBIOS type 42h record. <be>
+In order to recognize the specific BMC-exposed USB NIC in case the platform has more than one USB NIC
+devices attached, the MAC address specified in the EFI Device Path Protocol of SNP EFI handle is used to
+match with the MAC address of IPMI message channel. Due to the network information such as the MAC
+address, IP address, Subnet mask and Gateway are assigned by BMC, edk2 Redfish implementation needs a
+programmatic way to recognize the BMC-exposed USB NIC.
+
+    *  **MAC address:** Searching for the BMC-exposed USB NIC<br>
+    The last byte of host-end USB NIC MAC address is the last byte of BMC-end USB NIC MAC address minus 1.
+    RedfishPlatformHostInterfaceLib issues the NetFn Transport IPMI command to get the MAC address of each
+    channel and checks them with the MAC address specified in the EFI Device Path Protocol.<br>
+
+          **_For example:_**<br>
+          BMC-end USB NIC MAC address: 11-22-33-44-55-00<br>
+          Host-end USB NIC MAC address: 11-22-33-44-55-ff
+
+    *  **IP Address:** Acquiring the host-end USB NIC IP Address<br>
+    The last byte of host-end USB NIC IPv4 address is the last byte of BMC-end USB NIC IPv4 address minus 1.
+
+          **_For example:_**<br>
+          BMC-end USB NIC IPv4 address: 165.10.0.10<br>
+          Host-end USB NIC IPv4 address: 165.10.0.9
+
+    *  **Other Network Properties**: <br>
+    Due to the host-end USB NIC and BMC-end USB NIC is a link-local network. Both of them have the same
+    network properties such as subnet mask and gateway. RedfishPlatformHostInterfaceLib issues the NetFn
+    Transport IPMI command to get the network properties of BMC-end USB NIC and apply it on host-end USB
+    NIC.
+
+  * **IPMI Commands that Used to Build up Redfish Host Interface**
+
+    Standard IPMI commands those are used to build up the Redfish Host Interface for BMC-exposed USB NIC.
+    The USB NIC exposed by BMC must be reported as one of the message channels as 802.3 LAN/IPMB 1.0 message
+    channel.
+
+    | IPMI NetFn | IPMI Command| Purpose | Corresponding Host Interface Field|
+    |------------|-------------|---------|-----------------------------------|
+    | App<br>(0x06) | 0x42 | Check the message channel's medium type and protocol.<br>Medium: 802.3 LAN<br>Protocol: IPMB 1.0| None|
+    | Transport<br>(0x0C) | 0x02 | Get MAC address of message channel. Used to match with the MAC address populated in EFI Device Path of network device| None|
+    | Group Ext<br>(0x2C) | Group Extension ID: 0x52<br>Command: 0x02 | Check if Redfish bootstrap credential is supported or not.| In Device Descriptor Data, Credential Bootstrapping Handle|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x04 | Get BMC-end message channel IP address source| In Protocol Specific Record Data<br>- Host IP Assignment Type<br>- Redfish Service IP Discovery Type<br>- Generate the Host-side IP address|.
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x03 | Get BMC-end message channel IPv4 address| In Protocol Specific Record Data<br>- Host IP Address Format<br>- Host IP Address|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x06 | Get BMC-end message channel IPv4 subnet mask| In Protocol Specific Record Data<br>- Host IP Mask<br>- Redfish Service IP Mask|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x12 | Get BMC-end message channel gateway IP address| None, used to configure edk2 network configuration|
+    | Transport<br>(0x0C) | Command: 0x02<br>Parameter: 0x14 | Get BMC-end message channel VLAN ID| In Protocol Specific Record Data<br> Redfish Service VLAN ID|
+
+  **__NOTE__**
+```
+Current RedfishPlatformHostInterfaceLib implementation of BMC-exposed USB NIC can only support IPv4 address format.
+```

 ## Miscellaneous:

@@ -65,7 +160,6 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
     For example, run shell command "RedfishPlatformConfig.efi -s 192.168.10.101 255.255.255.0 192.168.10.123 255.255.255.0", which means
       the source IP address is 192.168.10.101, and the Redfish Server IP address is 192.168.10.123.
    ```
-
    * **Redfish Profile Simulator**
    Refer to [Redfish Profile Simulator](https://github.com/DMTF/Redfish-Profile-Simulator) to set up the Redfish service.
    We are also in the progress to contribute bug fixes and enhancements to the mainstream Redfish Profile Simulator in order to incorporate with EDK2 Redfish solution.
@@ -121,7 +215,9 @@ The library is incorporated with RedfishLib ***[[13]](#[0])*** to encode and dec
 1. [DSP0270](https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf) - Redfish Host Interface Specification, 1.3.0
 2. [DSP0266](https://www.dmtf.org/sites/default/files/standards/documents/DSP0266_1.12.0.pdf) - Redfish Specification, 1.12.0
 3. Redfish Schemas - https://redfish.dmtf.org/schemas/v1/
-4. UEFI Specification - http://uefi.org/specifications
+4. SMBIOS - https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
+5. USB CDC - https://www.usb.org/document-library/class-definitions-communication-devices-12
+6. UEFI Specification - http://uefi.org/specifications

 ## The Contributors
 Thanks to the below predecessors who contributed to the UEFI EDK2 Redfish Prove of Concept code.\
diff --git a/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg b/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
new file mode 100644
index 00000000000..c7088eb8d54
--- /dev/null
+++ b/RedfishPkg/Documents/Media/BmcExposedUsbNic.svg
@@ -0,0 +1,283 @@
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+ <defs class="ClipPathGroup">
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+  <clipPath id="presentation_clip_path_shrink" clipPathUnits="userSpaceOnUse">
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--
2.37.1.windows.1