+static u64
+add_del_arp (gid_l2_arp_table_t * db, u32 bd, ip4_address_t * key, u64 value,
+ u8 is_add)
+{
+ BVT (clib_bihash_kv) kv, result;
+ u32 old_val = ~0;
+
+ make_arp_key (&kv, bd, key);
+ if (BV (clib_bihash_search) (&db->arp_lookup_table, &kv, &result) == 0)
+ old_val = result.value;
+
+ if (is_add)
+ {
+ kv.value = value;
+ BV (clib_bihash_add_del) (&db->arp_lookup_table, &kv, 1 /* is_add */ );
+ db->count++;
+ }
+ else
+ {
+ BV (clib_bihash_add_del) (&db->arp_lookup_table, &kv, 0 /* is_add */ );
+ db->count--;
+ }
+ return old_val;
+}
+
+static u32
+add_del_nsh (gid_nsh_table_t * db, u32 vni, u32 spi, u8 si, u32 value,
+ u8 is_add)
+{
+ BVT (clib_bihash_kv) kv, result;
+ u32 old_val = ~0;
+
+ make_nsh_key (&kv, vni, spi, si);
+ if (BV (clib_bihash_search) (&db->nsh_lookup_table, &kv, &result) == 0)
+ old_val = result.value;
+
+ if (is_add)
+ {
+ kv.value = value;
+ BV (clib_bihash_add_del) (&db->nsh_lookup_table, &kv, 1 /* is_add */ );
+ db->count++;
+ }
+ else
+ {
+ BV (clib_bihash_add_del) (&db->nsh_lookup_table, &kv, 0 /* is_add */ );
+ db->count--;
+ }
+ return old_val;
+}
+