[HICN-482] trigger map-me updates from the forwarding strategy

Signed-off-by: michele papalini <micpapal@cisco.com>
Change-Id: Icc41824f2f29580229ce8b3ce066f121870e012d
Signed-off-by: michele papalini <micpapal@cisco.com>

6 files changed, 107 insertions, 22 deletions

diff --git a/hicn-light/src/hicn/processor/fibEntry.c b/hicn-light/src/hicn/processor/fibEntry.c
index 2c41f1c7b..077e33ff3 100644
--- a/hicn-light/src/hicn/processor/fibEntry.c
+++ b/hicn-light/src/hicn/processor/fibEntry.c
@@ -114,7 +114,8 @@ FibEntry *fibEntry_Create(Name *name, strategy_type fwdStrategy) {
 
   if(fwdStrategy == SET_STRATEGY_LOW_LATENCY){
     strategyLowLatency_SetStrategy(fibEntry->fwdStrategy,
-                                     fibEntry->forwarder, fibEntry);
+                                     fibEntry->forwarder, fibEntry,
+                                     0, NULL);
   }
   return fibEntry;
 }
@@ -146,7 +147,9 @@ void fibEntry_Release(FibEntry **fibEntryPtr) {
   *fibEntryPtr = NULL;
 }
 
-void fibEntry_SetStrategy(FibEntry *fibEntry, strategy_type strategy) {
+void fibEntry_SetStrategy(FibEntry *fibEntry, strategy_type strategy,
+                          unsigned related_prefixes_len,
+                          Name **related_prefixes) {
   StrategyImpl *fwdStrategyImpl;
 
   switch (strategy) {
@@ -171,7 +174,8 @@ void fibEntry_SetStrategy(FibEntry *fibEntry, strategy_type strategy) {
 
   if(strategy == SET_STRATEGY_LOW_LATENCY){
     strategyLowLatency_SetStrategy(fwdStrategyImpl,
-                                    fibEntry->forwarder, fibEntry);
+                       fibEntry->forwarder, fibEntry,
+                       related_prefixes_len, related_prefixes);
   }
 
   const NumberSet *nexthops = fibEntry_GetNexthops(fibEntry);
diff --git a/hicn-light/src/hicn/processor/fibEntry.h b/hicn-light/src/hicn/processor/fibEntry.h
index 13f002eb9..9e438b0e6 100644
--- a/hicn-light/src/hicn/processor/fibEntry.h
+++ b/hicn-light/src/hicn/processor/fibEntry.h
@@ -79,7 +79,9 @@ void fibEntry_Release(FibEntry **fibEntryPtr);
  */
 FibEntry *fibEntry_Acquire(const FibEntry *fibEntry);
 
-void fibEntry_SetStrategy(FibEntry *fibEntry, strategy_type strategy);
+void fibEntry_SetStrategy(FibEntry *fibEntry, strategy_type strategy,
+                           unsigned related_prefixes_len,
+                           Name **related_prefixes);
 
 void fibEntry_AddNexthop(FibEntry *fibEntry, unsigned connectionId);
 
diff --git a/hicn-light/src/hicn/processor/messageProcessor.c b/hicn-light/src/hicn/processor/messageProcessor.c
index e38a3d558..bdd9c23e8 100644
--- a/hicn-light/src/hicn/processor/messageProcessor.c
+++ b/hicn-light/src/hicn/processor/messageProcessor.c
@@ -390,7 +390,8 @@ void processor_SetStrategy(MessageProcessor *processor, Name *prefix,
                            Name **related_prefixes){
   FibEntry *entry = fib_Contains(processor->fib, prefix);
   if (entry != NULL) {
-    fibEntry_SetStrategy(entry, strategy);
+    fibEntry_SetStrategy(entry, strategy, related_prefixes_len,
+                        related_prefixes);
   }
 }
 
diff --git a/hicn-light/src/hicn/strategies/lowLatency.c b/hicn-light/src/hicn/strategies/lowLatency.c
index a96b7b0af..e1d16b39d 100644
--- a/hicn-light/src/hicn/strategies/lowLatency.c
+++ b/hicn-light/src/hicn/strategies/lowLatency.c
@@ -31,7 +31,6 @@
 
 #include <hicn/strategies/lowLatency.h>
 #include <hicn/strategies/nexthopStateLowLatency.h>
-#include <hicn/processor/fibEntry.h>
 
 const unsigned STABILITY_FACTOR = 15;
 const unsigned MAX_SWITCH_TRY = 10;
@@ -92,7 +91,6 @@ struct strategy_low_latency {
   //hash map from sequence number to face id
   PARCHashMap *pending_probes_faces;
   const Forwarder * forwarder;
-  const FibEntry * fibEntry;
   PARCEventTimer *sendProbes;
   PARCEventTimer *computeBestFace;
   uint8_t * probe;
@@ -104,6 +102,8 @@ struct strategy_low_latency {
   unsigned rounds_avoiding_multipath;
   bool use2paths;
   bool avoid_multipath;
+  unsigned related_prefixes_len;
+  Name **related_prefixes;
 #ifndef WITH_POLICY
   NumberSet *nexthops;
 #endif /* ! WITH_POLICY */
@@ -184,9 +184,27 @@ static void strategyLowLatency_SendProbesCB(int fd, PARCEventType which_event,
   parcEventTimer_Start(ll->sendProbes, &timeout);
 }
 
+static void strategyLowLatency_SendMapmeUpdate(StrategyLowLatency *ll,
+                                               const NumberSet * nexthops){
+  MapMe * mapme = forwarder_getMapmeInstance(ll->forwarder);
+  FIB * fib = forwarder_getFib((Forwarder*) ll->forwarder);
+  if(fib != NULL){
+    for(unsigned i = 0; i < ll->related_prefixes_len; i++){
+      FibEntry *fibEntry = fib_MatchName(fib, ll->related_prefixes[i]);
+      if(fibEntry != NULL){
+        mapme_send_updates(mapme, fibEntry, nexthops);
+      }
+    }
+  }
+}
+
 static void strategyLowLatency_SelectBestFaces(StrategyLowLatency *ll,
                                                         bool new_round){
 
+  StrategyNexthopStateLL * old_faces[2];
+  old_faces[0] = ll->bestFaces[0];
+  old_faces[1] = ll->bestFaces[1];
+
   if(new_round){
     ll->round++;
   }
@@ -416,7 +434,7 @@ static void strategyLowLatency_SelectBestFaces(StrategyLowLatency *ll,
   }
 
   NEW_ROUND:
-#if 1
+#if 0
     if(ll->use2paths){
       printf("use 2 paths. rtt face %d = %f queue = %f is_lossy = %d,"
              "rtt face %d = %f queue = %f is_lossy = %d\n",
@@ -440,16 +458,61 @@ static void strategyLowLatency_SelectBestFaces(StrategyLowLatency *ll,
       }
     }
 #endif
-    //update the round only at the end for all the faces
-    if(new_round){
-      PARCIterator * iterator = parcHashMap_CreateKeyIterator(ll->strategy_state);
-      while (parcIterator_HasNext(iterator)) {
-        PARCUnsigned *cid = (PARCUnsigned *) parcIterator_Next(iterator);
-        strategyNexthopStateLL_StartNewRound((StrategyNexthopStateLL *)
-            parcHashMap_Get(ll->strategy_state, cid));
+  //update the round only at the end for all the faces
+  if(new_round){
+    PARCIterator * iterator = parcHashMap_CreateKeyIterator(ll->strategy_state);
+    while (parcIterator_HasNext(iterator)) {
+      PARCUnsigned *cid = (PARCUnsigned *) parcIterator_Next(iterator);
+      strategyNexthopStateLL_StartNewRound((StrategyNexthopStateLL *)
+          parcHashMap_Get(ll->strategy_state, cid));
+    }
+    parcIterator_Release(&iterator);
+  }
+
+  //mapme updates
+  //if ll->bestFaces[0] == NULL we don't have any output faces
+  //so don't need to send any updates since we are disconnected
+  if(ll->related_prefixes_len != 0){
+    if(ll->bestFaces[0] != NULL){
+      NumberSet *out = numberSet_Create();
+      if(old_faces[0] == NULL ||
+         (strategyNexthopStateLL_GetFaceId(ll->bestFaces[0]) !=
+         strategyNexthopStateLL_GetFaceId(old_faces[0]))){
+          //there is a new face 0 so we need a map me update
+          //if ll->bestFaces[1] != NULL we need to send the update
+          //even if it is the same as before
+        numberSet_Add(out,
+          strategyNexthopStateLL_GetFaceId(ll->bestFaces[0]));
+        if(ll->bestFaces[1] != NULL){
+          numberSet_Add(out,
+            strategyNexthopStateLL_GetFaceId(ll->bestFaces[1]));
+        }
+        strategyLowLatency_SendMapmeUpdate(ll,out);
+      }else{
+        if(ll->bestFaces[1] != NULL){
+          if(old_faces[1] == NULL ||
+              (strategyNexthopStateLL_GetFaceId(ll->bestFaces[1]) !=
+              strategyNexthopStateLL_GetFaceId(old_faces[1]))){
+            //send a mapme both with face 0 and face 1
+            numberSet_Add(out,
+              strategyNexthopStateLL_GetFaceId(ll->bestFaces[0]));
+            numberSet_Add(out,
+              strategyNexthopStateLL_GetFaceId(ll->bestFaces[1]));
+            strategyLowLatency_SendMapmeUpdate(ll,out);
+          }
+        }else{
+          if(old_faces[1] != NULL){
+            //in the previuos round we were using two faces, now only one
+            //send update with only face 0
+            numberSet_Add(out,
+              strategyNexthopStateLL_GetFaceId(ll->bestFaces[0]));
+            strategyLowLatency_SendMapmeUpdate(ll,out);
+          }
+        }
       }
-      parcIterator_Release(&iterator);
+      numberSet_Release(&out);
     }
+  }
 }
 
 static void strategyLowLatency_BestFaceCB(int fd, PARCEventType which_event,
@@ -489,12 +552,13 @@ StrategyImpl *strategyLowLatency_Create() {
 }
 
 void strategyLowLatency_SetStrategy(StrategyImpl *strategy,
-                                          const Forwarder * forwarder,
-                                          const FibEntry * fibEntry){
+                                    const Forwarder * forwarder,
+                                    const FibEntry * fibEntry,
+                                    unsigned related_prefixes_len,
+                                    Name **related_prefixes) {
   StrategyLowLatency *ll =
       (StrategyLowLatency *)strategy->context;
   ll->forwarder = forwarder;
-  ll->fibEntry = fibEntry;
 
   //create probe packet
   ll->probe = messageHandler_CreateProbePacket(HF_INET6_TCP, PROBE_LIFETIME);
@@ -515,6 +579,12 @@ void strategyLowLatency_SetStrategy(StrategyImpl *strategy,
   ll->use2paths = false;
   ll->avoid_multipath = false;
 
+  ll->related_prefixes_len = related_prefixes_len;
+  ll->related_prefixes = malloc(sizeof(Name *) * ll->related_prefixes_len);
+  for(unsigned i = 0; i < ll->related_prefixes_len; i++){
+    ll->related_prefixes[i] = name_Copy(related_prefixes[i]);
+  }
+
   ll->computeBestFace = dispatcher_CreateTimer(dispatcher, false,
                                      strategyLowLatency_BestFaceCB, ll);
 }
@@ -755,6 +825,12 @@ static void _strategyLowLatency_ImplDestroy(StrategyImpl **strategyPtr) {
 
   parcMemory_Deallocate(&(strategy->probe));
   parcMemory_Deallocate(&(strategy->name));
+
+  for(unsigned i = 0; i < strategy->related_prefixes_len; i++){
+    name_Release(&(strategy->related_prefixes[i]));
+  }
+  free(strategy->related_prefixes);
+
 #ifndef WITH_POLICY
   numberSet_Release(&(strategy->nexthops));
 #endif /* ! WITH_POLICY */
diff --git a/hicn-light/src/hicn/strategies/lowLatency.h b/hicn-light/src/hicn/strategies/lowLatency.h
index f82a576f1..736c8783d 100644
--- a/hicn-light/src/hicn/strategies/lowLatency.h
+++ b/hicn-light/src/hicn/strategies/lowLatency.h
@@ -26,6 +26,8 @@
 StrategyImpl *strategyLowLatency_Create();
 
 void strategyLowLatency_SetStrategy(StrategyImpl *strategy,
-                                          const Forwarder * forwarder,
-                                          const FibEntry * fibEntry);
+                                    const Forwarder * forwarder,
+                                    const FibEntry * fibEntry,
+                                    unsigned related_prefixes_len,
+                                    Name **related_prefixes);
 #endif  // lowLatency_h
diff --git a/hicn-light/src/hicn/strategies/nexthopStateLowLatency.c b/hicn-light/src/hicn/strategies/nexthopStateLowLatency.c
index fd83bb072..a3953987f 100644
--- a/hicn-light/src/hicn/strategies/nexthopStateLowLatency.c
+++ b/hicn-light/src/hicn/strategies/nexthopStateLowLatency.c
@@ -31,7 +31,7 @@ const unsigned MAX_ROUNS_WITHOUT_PROBES = 4;
 const unsigned MIN_NON_LOSSY_ROUNDS = 10;
         //number of rounds in non lossy mode before switch to
         //no lossy state
-const double MAX_LOSS_RATE = 0.15; //15%
+const double MAX_LOSS_RATE = 0.10; //10%
 
 struct strategy_nexthop_state_ll {
   bool in_use;