Fix a test issue for the dualtor tunnel monitor for Nvidia platforms (#9625)

When the inner/outer dscps are 2/2 or 6/6, the packet is not mapped to queue according to the mapping configuration. And such packets are not expected in production, skip the queue check for them.

Change-Id: I8f02d086d2f9eb010684e1ac41cf1abfe6ca2788

Author: congh-nvidia

tests/common/devices/sonic.py

@@ -1728,6 +1728,9 @@ def get_asic_name(self):
 
         return asic
 
+    def is_nvidia_platform(self):
+        return 'mellanox' == self.facts['asic_type']
+
     def _get_platform_asic(self, platform):
         platform_asic = os.path.join(
             "/usr/share/sonic/device", platform, "platform_asic"

tests/common/dualtor/tunnel_traffic_utils.py

@@ -237,6 +237,12 @@ def _disassemble_ip_tos(tos):
             inner_dscp, _ = _disassemble_ip_tos(inner_tos)
             logging.info("Outer packet DSCP: {0:06b}, inner packet DSCP: {1:06b}".format(outer_dscp, inner_dscp))
             check_res = []
+            # For Nvidia platforms, queue check for outer/inner dscp 2/2 and 6/6 will fail due to the diversity
+            # in dscp remapping. Since we don't expect such packets in production, skip the queue check in this case.
+            if self.standby_tor.is_nvidia_platform():
+                logging.info("Skip the queue check for inner/outer dscp 2/2 and 6/6 on Nvidia platforms.")
+                if (inner_dscp, outer_dscp) in [(2, 2), (6, 6)]:
+                    return " ,".join(check_res)
             exp_queue = derive_queue_id_from_dscp(self.standby_tor, inner_dscp, True)
             logging.info("Expect queue: %s", exp_queue)
             if not wait_until(60, 5, 0, queue_stats_check, self.standby_tor, exp_queue, self.packet_count):