UML - Add VDE networking support

Index: linux-2.6.21-mm/arch/um/Kconfig.net
===================================================================
@@ -108,6 +108,28 @@ config UML_NET_DAEMON
         more than one without conflict.  If you don't need UML networking,
         say N.
 
+config UML_NET_VDE
+	bool "VDE transport"
+	depends on UML_NET
+	help
+	This User-Mode Linux network transport allows one or more running
+	UMLs on a single host to communicate with each other and also
+	with the rest of the world using Virtual Distributed Ethernet,
+	an improved fork of uml_switch.
+
+	You must have libvdeplug installed in order to build the vde
+	transport into UML.
+
+	To use this form of networking, you will need to run vde_switch
+	on the host.
+
+	For more information, see <http://wiki.virtualsquare.org/>
+	That site has a good overview of what VDE is and also examples
+	of the UML command line to use to enable VDE networking.
+
+	If you need UML networking with VDE,
+	say Y.
+
 config UML_NET_MCAST
 	bool "Multicast transport"
 	depends on UML_NET

Index: linux-2.6.21-mm/arch/um/drivers/Makefile
===================================================================
@@ -18,11 +18,16 @@ port-objs := port_kern.o port_user.o
 harddog-objs := harddog_kern.o harddog_user.o
 
 LDFLAGS_pcap.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libpcap.a)
+LDFLAGS_vde.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libvdeplug.a)
 
-targets := pcap_kern.o pcap_user.o
+targets := pcap_kern.o pcap_user.o vde_kern.o vde_user.o
 
 $(obj)/pcap.o: $(obj)/pcap_kern.o $(obj)/pcap_user.o
 	$(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_pcap.o)
+
+$(obj)/vde.o: $(obj)/vde_kern.o $(obj)/vde_user.o
+	$(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_vde.o)
+
 #XXX: The call below does not work because the flags are added before the
 # object name, so nothing from the library gets linked.
 #$(call if_changed,ld)

@@ -37,6 +42,7 @@ obj-$(CONFIG_STDERR_CONSOLE) += stderr_c
 obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
 obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
 obj-$(CONFIG_UML_NET_DAEMON) += daemon.o 
+obj-$(CONFIG_UML_NET_VDE) += vde.o
 obj-$(CONFIG_UML_NET_MCAST) += mcast.o 
 obj-$(CONFIG_UML_NET_PCAP) += pcap.o
 obj-$(CONFIG_UML_NET) += net.o 

@@ -54,6 +60,6 @@ obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_
 obj-$(CONFIG_UML_RANDOM) += random.o
 
 # pcap_user.o must be added explicitly.
-USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o
 
 include arch/um/scripts/Makefile.rules