tc: Add support for HTB scheduling

Change-Id: Ib6f38e547441fa981f39fe0f06d502c63d6585b6
Signed-off-by: San Mehat <san@google.com>
diff --git a/tc/tc.c b/tc/tc.c
index 14ff85f..a261136 100644
--- a/tc/tc.c
+++ b/tc/tc.c
@@ -46,6 +46,7 @@
 
 #ifdef ANDROID
 extern struct qdisc_util cbq_qdisc_util;
+extern struct qdisc_util htb_qdisc_util;
 extern struct qdisc_util ingress_qdisc_util;
 extern struct filter_util u32_filter_util;
 #endif
@@ -106,10 +107,12 @@
 #ifdef ANDROID
 	if (!strcmp(str, "cbq"))
 		return &cbq_qdisc_util;
+	else if (!strcmp(str, "htb"))
+		return &htb_qdisc_util;
 	else if (!strcmp(str, "ingress"))
 		return &ingress_qdisc_util;
 	else {
-		fprintf(stderr, "Android does not support '%s'\n", str);
+		fprintf(stderr, "Android does not support qdisc '%s'\n", str);
 		return NULL;
 	}
 #endif
@@ -162,7 +165,7 @@
 	if (!strcmp(str, "u32"))
 		return &u32_filter_util;
 	else {
-		fprintf(stderr, "Android does not support '%s'\n", str);
+		fprintf(stderr, "Android does not support filter '%s'\n", str);
 		return NULL;
 	}
 #endif