sonic-swss: Code changes for WRED and ECN statistics

* New flex counter group for per-Queue WRED and ECN statistics
* New flex counter group for per-Port WRED and ECN statistics

  Signed-off-by: [email protected]

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**What I did**
WRED and ECN statistics support

**Why I did it**
Implemented as per the HLD : https://github.com/sonic-net/SONiC/blob/master/doc/qos/ECN_and_WRED_statistics_HLD.md

**How I verified it**
Verfied it using Marvell DUT and SWSS unit tests.

**Details if related**
- Two new flex counters added for per-Queue and per-Port WRED ECN statistics.

Build dependency on sonic-swss-common pull request : sonic-net/sonic-swss-common#777

Expected order of dependent pull-request to be committed :
1) sonic-swss common pull request : sonic-net/sonic-swss-common#777
2) sonic-yang-model pull requests : sonic-net/sonic-buildimage#14758
3) sonic-sairedis pull request : sonic-net/sonic-sairedis#1234
4) sonic-swss : pull request : sonic-net/sonic-swss#2750
5) sonic-utilities pull request : sonic-net/sonic-utilities#2807

Author: mssonicbld

orchagent/flexcounterorch.cpp

@@ -44,6 +44,8 @@ extern sai_object_id_t gSwitchId;
 #define FLOW_CNT_TRAP_KEY           "FLOW_CNT_TRAP"
 #define FLOW_CNT_ROUTE_KEY          "FLOW_CNT_ROUTE"
 #define ENI_KEY                     "ENI"
+#define WRED_QUEUE_KEY              "WRED_ECN_QUEUE"
+#define WRED_PORT_KEY               "WRED_ECN_PORT"
 
 unordered_map<string, string> flexCounterGroupMap =
 {
@@ -66,7 +68,9 @@ unordered_map<string, string> flexCounterGroupMap =
     {"MACSEC_SA", COUNTERS_MACSEC_SA_GROUP},
     {"MACSEC_SA_ATTR", COUNTERS_MACSEC_SA_ATTR_GROUP},
     {"MACSEC_FLOW", COUNTERS_MACSEC_FLOW_GROUP},
-    {"ENI", ENI_STAT_COUNTER_FLEX_COUNTER_GROUP}
+    {"ENI", ENI_STAT_COUNTER_FLEX_COUNTER_GROUP},
+    {"WRED_ECN_PORT", WRED_PORT_STAT_COUNTER_FLEX_COUNTER_GROUP},
+    {"WRED_ECN_QUEUE", WRED_QUEUE_STAT_COUNTER_FLEX_COUNTER_GROUP},
 };
 
 
@@ -208,6 +212,17 @@ void FlexCounterOrch::doTask(Consumer &consumer)
                             m_pg_watermark_enabled = true;
                             gPortsOrch->addPriorityGroupWatermarkFlexCounters(getPgConfigurations());
                         }
+			else if(key == WRED_PORT_KEY)
+			{
+                            gPortsOrch->generateWredPortCounterMap();
+                            m_wred_port_counter_enabled = true;
+			}
+			else if(key == WRED_QUEUE_KEY)
+			{
+                            gPortsOrch->generateQueueMap(getQueueConfigurations());
+                            m_wred_queue_counter_enabled = true;
+                            gPortsOrch->addWredQueueFlexCounters(getQueueConfigurations());
+			}
                     }
                     if(gIntfsOrch && (key == RIF_KEY) && (value == "enable"))
                     {
@@ -334,6 +349,16 @@ bool FlexCounterOrch::getPgWatermarkCountersState() const
     return m_pg_watermark_enabled;
 }
 
+bool FlexCounterOrch::getWredQueueCountersState() const
+{
+    return m_wred_queue_counter_enabled;
+}
+
+bool FlexCounterOrch::getWredPortCountersState() const
+{
+    return m_wred_port_counter_enabled;
+}
+
 bool FlexCounterOrch::bake()
 {
     /*

orchagent/flexcounterorch.h

@@ -54,6 +54,8 @@ class FlexCounterOrch: public Orch
     std::map<std::string, FlexCounterPgStates> getPgConfigurations();
     bool getHostIfTrapCounterState() const {return m_hostif_trap_counter_enabled;}
     bool getRouteFlowCountersState() const {return m_route_flow_counter_enabled;}
+    bool getWredQueueCountersState() const;
+    bool getWredPortCountersState() const;
     bool bake() override;
 
 private:
@@ -66,6 +68,8 @@ class FlexCounterOrch: public Orch
     bool m_hostif_trap_counter_enabled = false;
     bool m_route_flow_counter_enabled = false;
     bool m_delayTimerExpired = false;
+    bool m_wred_queue_counter_enabled = false;
+    bool m_wred_port_counter_enabled = false;
     Table m_bufferQueueConfigTable;
     Table m_bufferPgConfigTable;
     Table m_deviceMetadataConfigTable;