[vnetorch] Add ECMP support for vnet tunnel routes

orchagent/nexthopkey.h

@@ -82,6 +82,8 @@ struct NextHopKey
         weight = 0;
     }
 
+    NextHopKey(const IpAddress &ip, const MacAddress &mac, const uint32_t &vni, bool overlay_nh) : ip_address(ip), alias(""), vni(vni), mac_address(mac){}
+
     const std::string to_string() const
     {
         std::string str = formatMplsNextHop();

orchagent/routeorch.cpp

@@ -2335,3 +2335,18 @@ bool RouteOrch::removeOverlayNextHops(sai_object_id_t vrf_id, const NextHopGroup
 
     return true;
 }
+
+void RouteOrch::increaseNextHopGroupCount()
+{
+    m_nextHopGroupCount ++;
+}
+
+void RouteOrch::decreaseNextHopGroupCount()
+{
+    m_nextHopGroupCount --;
+}
+
+bool RouteOrch::checkNextHopGroupCount()
+{
+    return m_nextHopGroupCount < m_maxNextHopGroupCount;
+}

orchagent/routeorch.h

@@ -205,6 +205,10 @@ class RouteOrch : public Orch, public Subject
 
     unsigned int getNhgCount() { return m_nextHopGroupCount; }
     unsigned int getMaxNhgCount() { return m_maxNextHopGroupCount; }
+
+    void increaseNextHopGroupCount();
+    void decreaseNextHopGroupCount();
+    bool checkNextHopGroupCount();
 
 private:
     SwitchOrch *m_switchOrch;