tests: test input policer

Apply a policer to an interface, check it's policing packets.
Remove it and check it no longer polices packets.

Type: test
Signed-off-by: Brian Russell <brian@graphiant.com>
Change-Id: I6f694c8a9804cadf010b5831770aaae81f42e027

src/vnet/policer/test/test_policer_input.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# Copyright (c) 2021 Graphiant, Inc.
+
+import unittest
+import scapy.compat
+from scapy.layers.inet import IP, UDP
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+from framework import VppTestCase, VppTestRunner
+from vpp_papi import VppEnum
+from vpp_policer import VppPolicer, PolicerAction
+
+NUM_PKTS = 67
+
+
+class TestPolicerInput(VppTestCase):
+    """ Policer on an input interface """
+
+    def setUp(self):
+        super(TestPolicerInput, self).setUp()
+
+        self.create_pg_interfaces(range(2))
+        for i in self.pg_interfaces:
+            i.admin_up()
+            i.config_ip4()
+            i.resolve_arp()
+
+        self.pkt = (Ether(src=self.pg0.remote_mac,
+                          dst=self.pg0.local_mac) /
+                    IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
+                    UDP(sport=1234, dport=1234) /
+                    Raw(b'\xa5' * 100))
+
+    def tearDown(self):
+        for i in self.pg_interfaces:
+            i.unconfig_ip4()
+            i.admin_down()
+        super(TestPolicerInput, self).tearDown()
+
+    def test_policer_input(self):
+        action_tx = PolicerAction(
+            VppEnum.vl_api_sse2_qos_action_type_t.SSE2_QOS_ACTION_API_TRANSMIT,
+            0)
+        policer = VppPolicer(self, "pol1", 80, 0, 1000, 0,
+                             conform_action=action_tx,
+                             exceed_action=action_tx,
+                             violate_action=action_tx)
+        policer.add_vpp_config()
+
+        # Start policing on pg0
+        policer.apply_vpp_config(self.pg0.sw_if_index, True)
+
+        rx = self.send_and_expect(self.pg0, self.pkt * NUM_PKTS, self.pg1)
+        stats = policer.get_stats()
+
+        # Single rate, 2 colour policer - expect conform, violate but no exceed
+        self.assertGreater(stats['conform_packets'], 0)
+        self.assertEqual(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        # Stop policing on pg0
+        policer.apply_vpp_config(self.pg0.sw_if_index, False)
+
+        rx = self.send_and_expect(self.pg0, self.pkt * NUM_PKTS, self.pg1)
+        statsnew = policer.get_stats()
+
+        # No new packets counted
+        self.assertEqual(stats, statsnew)
+
+        policer.remove_vpp_config()
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)

test/vpp_policer.py

@@ -61,6 +61,10 @@ class VppPolicer(VppObject):
         self._test.vapi.policer_bind(name=self.name, worker_index=worker,
                                      bind_enable=bind)
 
+    def apply_vpp_config(self, if_index, apply):
+        self._test.vapi.policer_input(name=self.name, sw_if_index=if_index,
+                                      apply=apply)
+
     def query_vpp_config(self):
         dump = self._test.vapi.policer_dump(
             match_name_valid=True, match_name=self.name)