+static clib_error_t *
+statseg_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
+{
+ stat_segment_main_t *sm = &stat_segment_main;
+ stat_segment_shared_header_t *shared_header = sm->shared_header;
+
+ void *oldheap = vlib_stats_push_heap (sm->interfaces);
+ vlib_stat_segment_lock ();
+
+ vec_validate (sm->interfaces, sw_if_index);
+ if (is_add)
+ {
+ vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
+ vnet_sw_interface_t *si_sup =
+ vnet_get_sup_sw_interface (vnm, si->sw_if_index);
+ vnet_hw_interface_t *hi_sup;
+
+ ASSERT (si_sup->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
+ hi_sup = vnet_get_hw_interface (vnm, si_sup->hw_if_index);
+
+ u8 *s = 0;
+ s = format (s, "%v", hi_sup->name);
+ if (si->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
+ s = format (s, ".%d", si->sub.id);
+ s = format (s, "%c", 0);
+ sm->interfaces[sw_if_index] = s;
+ }
+ else
+ {
+ vec_free (sm->interfaces[sw_if_index]);
+ sm->interfaces[sw_if_index] = 0;
+ }
+
+ stat_segment_directory_entry_t *ep;
+ ep = &sm->directory_vector[STAT_COUNTER_INTERFACE_NAMES];
+ ep->offset = stat_segment_offset (shared_header, sm->interfaces);
+
+ int i;
+ u64 *offset_vector =
+ ep->offset_vector ? stat_segment_pointer (shared_header,
+ ep->offset_vector) : 0;
+
+ vec_validate (offset_vector, vec_len (sm->interfaces) - 1);
+
+ if (sm->last != sm->interfaces)
+ {
+ /* the interface vector moved, so need to recalulate the offset array */
+ for (i = 0; i < vec_len (sm->interfaces); i++)
+ {
+ offset_vector[i] =
+ sm->interfaces[i] ? stat_segment_offset (shared_header,
+ sm->interfaces[i]) : 0;
+ }
+ }
+ else
+ {
+ offset_vector[sw_if_index] =
+ sm->interfaces[sw_if_index] ?
+ stat_segment_offset (shared_header, sm->interfaces[sw_if_index]) : 0;
+ }
+ ep->offset_vector = stat_segment_offset (shared_header, offset_vector);
+
+ vlib_stat_segment_unlock ();
+ clib_mem_set_heap (oldheap);
+
+ return 0;
+}
+
+VNET_SW_INTERFACE_ADD_DEL_FUNCTION (statseg_sw_interface_add_del);
+