+{
+ return vec_elt_at_index (vnm->interface_main.device_classes,
+ dev_class_index);
+}
+
+static inline u8 *
+vnet_get_sw_interface_tag (vnet_main_t * vnm, u32 sw_if_index)
+{
+ uword *p;
+ p = hash_get (vnm->interface_tag_by_sw_if_index, sw_if_index);
+ if (p)
+ return ((u8 *) p[0]);
+ return 0;
+}
+
+static inline void
+vnet_set_sw_interface_tag (vnet_main_t * vnm, u8 * tag, u32 sw_if_index)
+{
+ uword *p;
+ p = hash_get (vnm->interface_tag_by_sw_if_index, sw_if_index);
+ if (p)
+ {
+ u8 *oldtag = (u8 *) p[0];
+ hash_unset (vnm->interface_tag_by_sw_if_index, sw_if_index);
+ vec_free (oldtag);
+ }
+
+ hash_set (vnm->interface_tag_by_sw_if_index, sw_if_index, tag);
+}
+
+static inline void
+vnet_clear_sw_interface_tag (vnet_main_t * vnm, u32 sw_if_index)
+{
+ uword *p;
+ p = hash_get (vnm->interface_tag_by_sw_if_index, sw_if_index);
+ if (p)
+ {
+ u8 *oldtag = (u8 *) p[0];
+ hash_unset (vnm->interface_tag_by_sw_if_index, sw_if_index);
+ vec_free (oldtag);
+ }
+}
+
+/**
+ * Call back walk type for walking SW indices on a HW interface
+ */
+typedef void (*vnet_hw_sw_interface_walk_t) (vnet_main_t * vnm,
+ u32 sw_if_index, void *ctx);
+
+/**
+ * @brief
+ * Walk the SW interfaces on a HW interface - this is the super
+ * interface and any sub-interfaces.
+ */
+void vnet_hw_interface_walk_sw (vnet_main_t * vnm,
+ u32 hw_if_index,
+ vnet_hw_sw_interface_walk_t fn, void *ctx);