[PKT_SCHED]: GRED: Support ECN marking

Adds a new u8 flags in a unused padding area of the netlink
message. Adds ECN marking support to be used instead of dropping
packets immediately.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index d053add..0ebe320 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -220,8 +220,8 @@
 	__u32		DPs;
 	__u32		def_DP;
 	__u8		grio;
-	__u8		pad1;
-	__u16		pad2;
+	__u8		flags;
+	__u16		pad1;
 };
 
 /* HTB section */