[FC] Support Policer Counter (sonic-net#1533)

Added the implantation for policer counter -
Support in POLICER group and sai_serialize functions
Unit Tests: Included unit tests to add and remove policer counter.

Author: mssonicbld

meta/SaiSerialize.cpp

@@ -1106,6 +1106,14 @@ std::string sai_serialize_counter_stat(
     return sai_serialize_enum(counter, &sai_metadata_enum_sai_counter_stat_t);
 }
 
+std::string sai_serialize_policer_stat(
+        _In_ const sai_policer_stat_t counter)
+{
+    SWSS_LOG_ENTER();
+
+    return sai_serialize_enum(counter, &sai_metadata_enum_sai_policer_stat_t);
+}
+
 std::string sai_serialize_queue_attr(
         _In_ const sai_queue_attr_t attr)
 {

meta/sai_serialize.h

@@ -140,6 +140,9 @@ std::string sai_serialize_tunnel_stat(
 std::string sai_serialize_counter_stat(
         _In_ const sai_counter_stat_t counter);
 
+std::string sai_serialize_policer_stat(
+        _In_ const sai_policer_stat_t counter);
+
 std::string sai_serialize_queue_attr(
         _In_ const sai_queue_attr_t attr);
 

syncd/FlexCounter.cpp

@@ -28,6 +28,7 @@ static const std::string COUNTER_TYPE_TUNNEL = "Tunnel Counter";
 static const std::string COUNTER_TYPE_BUFFER_POOL = "Buffer Pool Counter";
 static const std::string COUNTER_TYPE_ENI = "DASH ENI Counter";
 static const std::string COUNTER_TYPE_METER_BUCKET = "DASH Meter Bucket Counter";
+static const std::string COUNTER_TYPE_POLICER = "Policer Counter";
 static const std::string ATTR_TYPE_QUEUE = "Queue Attribute";
 static const std::string ATTR_TYPE_PG = "Priority Group Attribute";
 static const std::string ATTR_TYPE_MACSEC_SA = "MACSEC SA Attribute";
@@ -164,6 +165,14 @@ std::string serializeStat(
     return sai_serialize_port_stat(stat);
 }
 
+template <>
+std::string serializeStat(
+        _In_ const sai_policer_stat_t stat)
+{
+    SWSS_LOG_ENTER();
+    return sai_serialize_policer_stat(stat);
+}
+
 template <>
 std::string serializeStat(
         _In_ const sai_queue_stat_t stat)
@@ -270,6 +279,15 @@ void deserializeStat(
     sai_deserialize_port_stat(name, stat);
 }
 
+template <>
+void deserializeStat(
+        _In_ const char* name,
+        _Out_ sai_policer_stat_t *stat)
+{
+    SWSS_LOG_ENTER();
+    sai_deserialize_policer_stat(name, stat);
+}
+
 template <>
 void deserializeStat(
         _In_ const char* name,
@@ -1714,6 +1732,10 @@ std::shared_ptr<BaseCounterContext> FlexCounter::createCounterContext(
     {
         return std::make_shared<AttrContext<sai_acl_counter_attr_t>>(context_name, SAI_OBJECT_TYPE_ACL_COUNTER, m_vendorSai.get(), m_statsMode);
     }
+    else if (context_name == COUNTER_TYPE_POLICER)
+    {
+        return std::make_shared<CounterContext<sai_policer_stat_t>>(context_name, SAI_OBJECT_TYPE_POLICER, m_vendorSai.get(), m_statsMode);
+    }
 
     SWSS_LOG_THROW("Invalid counter type %s", context_name.c_str());
     // GCC 8.3 requires a return value here
@@ -1992,6 +2014,13 @@ void FlexCounter::removeCounter(
             removeDataFromCountersDB(vid, ":TRAP");
         }
     }
+    else if (objectType == SAI_OBJECT_TYPE_POLICER)
+    {
+        if (hasCounterContext(COUNTER_TYPE_POLICER))
+        {
+            getCounterContext(COUNTER_TYPE_POLICER)->removeObject(vid);
+        }
+    }
     else
     {
         SWSS_LOG_ERROR("Object type for removal not supported, %s",
@@ -2126,6 +2155,14 @@ void FlexCounter::addCounter(
                     idStrings,
                     "");
         }
+        else if (objectType == SAI_OBJECT_TYPE_POLICER && field == POLICER_COUNTER_ID_LIST)
+        {
+            getCounterContext(COUNTER_TYPE_POLICER)->addObject(
+                    vid,
+                    rid,
+                    idStrings,
+                    "");
+        }
         else if (objectType == SAI_OBJECT_TYPE_BUFFER_POOL && field == BUFFER_POOL_COUNTER_ID_LIST)
         {
             counterIds = idStrings;

unittest/syncd/TestFlexCounter.cpp

@@ -745,6 +745,18 @@ TEST(FlexCounter, bulkCounter)
         {"10", "20"},
         counterVerifyFunc,
         false);
+
+    testAddRemoveCounter(
+        2,
+        SAI_OBJECT_TYPE_POLICER,
+        POLICER_COUNTER_ID_LIST,
+        {"SAI_POLICER_STAT_PACKETS", "SAI_POLICER_STAT_ATTR_BYTES",
+        "SAI_POLICER_STAT_GREEN_PACKETS", "SAI_POLICER_STAT_GREEN_BYTES",
+        "SAI_POLICER_STAT_YELLOW_PACKETS", "SAI_POLICER_STAT_YELLOW_BYTES",
+        "SAI_POLICER_STAT_RED_PACKETS", "SAI_POLICER_STAT_RED_BYTES"},
+        {"100", "200", "300", "400", "500", "600", "700", "800"},
+        counterVerifyFunc,
+        false);
     // buffer pool stats does not support bulk
     EXPECT_EQ(false, clearCalled);
 }