NetworkPkg: PXE boot option build flag

Currently, the only way to disable PXE boot options is to change the PCD
variables PcdIPv4PXESupport and PcdIPv6PXESupport in the source code or
use the "--pcd" option in the build script. Other boot options such
as HTTP or iSCSI can be disabled using the -D<option> flag.
NETWORK_PXE_BOOT_ENABLE will add a consistent way to disable PXE booting.
This is the third and final part of a series of patches to enable the
NETWORK_PXE_BOOT_ENABLE build flag. At this point, the flag will be able
to disable PXE functionality.

Signed-off-by: Alexander Gryanko <xpahos@gmail.com>

NetworkPkg/Network.fdf.inc

@@ -39,7 +39,10 @@
   !endif
 
   INF  NetworkPkg/TcpDxe/TcpDxe.inf
-  INF  NetworkPkg/UefiPxeBcDxe/UefiPxeBcDxe.inf
+
+  !if $(NETWORK_PXE_BOOT_ENABLE) == TRUE
+    INF  NetworkPkg/UefiPxeBcDxe/UefiPxeBcDxe.inf
+  !endif
 
   !if $(NETWORK_TLS_ENABLE) == TRUE
     INF  NetworkPkg/TlsDxe/TlsDxe.inf

NetworkPkg/NetworkComponents.dsc.inc

@@ -41,7 +41,10 @@
   !endif
 
   NetworkPkg/TcpDxe/TcpDxe.inf
-  NetworkPkg/UefiPxeBcDxe/UefiPxeBcDxe.inf
+
+  !if $(NETWORK_PXE_BOOT_ENABLE) == TRUE
+    NetworkPkg/UefiPxeBcDxe/UefiPxeBcDxe.inf
+  !endif
 
   !if $(NETWORK_TLS_ENABLE) == TRUE
     NetworkPkg/TlsDxe/TlsDxe.inf

NetworkPkg/NetworkDefines.dsc.inc

@@ -21,6 +21,7 @@
 #   DEFINE NETWORK_ISCSI_ENABLE           = FALSE
 #   DEFINE NETWORK_ISCSI_MD5_ENABLE       = TRUE
 #   DEFINE NETWORK_VLAN_ENABLE            = TRUE
+#   DEFINE NETWORK_PXE_BOOT_ENABLE        = TRUE
 #
 # Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
 # (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
@@ -137,6 +138,13 @@
   DEFINE NETWORK_ISCSI_MD5_ENABLE = TRUE
 !endif
 
+!ifndef NETWORK_PXE_BOOT_ENABLE
+  #
+  # This flag is to enable or disable PXE boot feature.
+  #
+  DEFINE NETWORK_PXE_BOOT_ENABLE = TRUE
+!endif
+
 !if $(NETWORK_ENABLE) == TRUE
   #
   # Check the flags to see if there is any conflict.

NetworkPkg/NetworkDynamicPcds.dsc.inc

@@ -14,7 +14,7 @@
 #
 # IPv4 and IPv6 PXE Boot support.
 #
-!if $(NETWORK_ENABLE) == TRUE
+!if ($(NETWORK_ENABLE) == TRUE) AND ($(NETWORK_PXE_BOOT_ENABLE) == TRUE)
   gEfiNetworkPkgTokenSpaceGuid.PcdIPv4PXESupport|0x01
   gEfiNetworkPkgTokenSpaceGuid.PcdIPv6PXESupport|0x01
 !endif

NetworkPkg/NetworkPkg.ci.yaml

@@ -83,5 +83,6 @@
         "BLD_*_NETWORK_HTTP_ENABLE": "FALSE",
         "BLD_*_NETWORK_HTTP_BOOT_ENABLE": "TRUE",
         "BLD_*_NETWORK_ISCSI_ENABLE": "TRUE",
+        "BLD_*_NETWORK_PXE_BOOT_ENABLE": "TRUE",
     }
 }