Configure Thread neighbour and destination cache (ARMmbed#2057)

Adjust Thread devices neighbour and destination cache parameters.

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_bbr_api.c

@@ -1144,8 +1144,11 @@ int thread_bbr_start(int8_t interface_id, int8_t backbone_interface_id)
     // By default multicast forwarding is not enabled as it causes multicast loops
     multicast_fwd_set_forwarding(this->interface_id, false);
 
-    // Adjust BBR neighbor and destination cache size
-    arm_nwk_ipv6_max_cache_entries(THREAD_BBR_IPV6_DESTINATION_CACHE_SIZE);
+    // Configure BBR neighbour cache parameters
+    arm_nwk_ipv6_neighbour_cache_configure(THREAD_BBR_IPV6_NEIGHBOUR_CACHE_SIZE,
+                                           THREAD_BBR_IPV6_NEIGHBOUR_CACHE_SHORT_TERM,
+                                           THREAD_BBR_IPV6_NEIGHBOUR_CACHE_LONG_TERM,
+                                           THREAD_BBR_IPV6_NEIGHBOUR_CACHE_LIFETIME);
 
     thread_extension_bbr_init(interface_id, backbone_interface_id);
 

source/6LoWPAN/Thread/thread_bootstrap.c

@@ -945,6 +945,31 @@ static void thread_interface_bootsrap_mode_init(protocol_interface_info_entry_t
         tr_debug("Set End node Mode");
         cur->thread_info->thread_device_mode = THREAD_DEVICE_MODE_END_DEVICE;
     }
+
+    if (cur->thread_info->thread_device_mode == THREAD_DEVICE_MODE_ROUTER) {
+        // set router neighbour cache
+        ipv6_neighbour_cache_configure(THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_SIZE,
+                                       THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_SHORT_TERM,
+                                       THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_LONG_TERM,
+                                       THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_LIFETIME);
+        // set router destination cache
+        ipv6_destination_cache_configure(THREAD_ROUTER_IPV6_DESTINATION_CACHE_SIZE,
+                                         THREAD_ROUTER_IPV6_DESTINATION_CACHE_SHORT_TERM,
+                                         THREAD_ROUTER_IPV6_DESTINATION_CACHE_LONG_TERM,
+                                         THREAD_ROUTER_IPV6_DESTINATION_CACHE_LIFETIME);
+    } else {
+        // device is some sort of end device
+        ipv6_neighbour_cache_configure(THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_SIZE,
+                                       THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_SHORT_TERM,
+                                       THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_LONG_TERM,
+                                       THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_LIFETIME);
+
+        ipv6_destination_cache_configure(THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_SIZE,
+                                         THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_SHORT_TERM,
+                                         THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_LONG_TERM,
+                                         THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_LIFETIME);
+    }
+
     cur->thread_info->thread_attached_state = THREAD_STATE_NETWORK_DISCOVER;
 }
 

source/6LoWPAN/Thread/thread_config.h

@@ -326,11 +326,34 @@
  */
 #define THREAD_BBR_ROUTER_ID_REQUEST_STATUS THREAD_COAP_STATUS_TLV_HAVE_CHILD_ID_REQUEST
 
-/*
- * Number of destination and neighbor cache entries assuming 250 thread devices (worst case) connecting to cloud service.
+/* Border Router IPv6 neighbour and destination cache configuration
+ * Number of neighbor cache entries assuming 250 thread devices (worst case) connecting to cloud service.
  * Six entries reserved for backbone devices.
  */
-#define THREAD_BBR_IPV6_DESTINATION_CACHE_SIZE  256
+#define THREAD_BBR_IPV6_NEIGHBOUR_CACHE_SIZE                256
+#define THREAD_BBR_IPV6_NEIGHBOUR_CACHE_SHORT_TERM          128
+#define THREAD_BBR_IPV6_NEIGHBOUR_CACHE_LONG_TERM           32
+#define THREAD_BBR_IPV6_NEIGHBOUR_CACHE_LIFETIME            600
+
+/* Router IPv6 neighbour and destination cache configuration */
+#define THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_SIZE             128
+#define THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_SHORT_TERM       64
+#define THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_LONG_TERM        8
+#define THREAD_ROUTER_IPV6_NEIGHBOUR_CACHE_LIFETIME         600
+#define THREAD_ROUTER_IPV6_DESTINATION_CACHE_SIZE           32
+#define THREAD_ROUTER_IPV6_DESTINATION_CACHE_SHORT_TERM     16
+#define THREAD_ROUTER_IPV6_DESTINATION_CACHE_LONG_TERM      4
+#define THREAD_ROUTER_IPV6_DESTINATION_CACHE_LIFETIME       600
+
+/* End device IPv6 neighbour and destination cache configuration */
+#define THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_SIZE         32
+#define THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_SHORT_TERM   16
+#define THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_LONG_TERM    4
+#define THREAD_END_DEVICE_IPV6_NEIGHBOUR_CACHE_LIFETIME     600
+#define THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_SIZE       16
+#define THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_SHORT_TERM 8
+#define THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_LONG_TERM  4
+#define THREAD_END_DEVICE_IPV6_DESTINATION_CACHE_LIFETIME   600
 
 /*
  * Timeout to solicit address from DHCP if previous request fails.