tests: add policer tests

Add some tests which configure policer params, use the policer
test helper CLI to police pretend packets and then check the
policer stats.

Type: test
Signed-off-by: Brian Russell <brian@graphiant.com>
Change-Id: Ib2688b6f77d84a4bfd3c8185e44c59fa2300716a

1 files changed, 123 insertions, 0 deletions

diff --git a/src/vnet/policer/test/test_policer.py b/src/vnet/policer/test/test_policer.py
new file mode 100644
index 00000000000..09b6e52da01
--- /dev/null
+++ b/src/vnet/policer/test/test_policer.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+# Copyright (c) 2021 Graphiant, Inc.
+
+import unittest
+
+from framework import VppTestCase, VppTestRunner
+from vpp_policer import VppPolicer, PolicerAction
+
+# Default for the tests is 10s of "Green" packets at 8Mbps, ie. 10M bytes.
+# The policer helper CLI "sends" 500 byte packets, so default is 20000.
+
+TEST_RATE = 8000    # kbps
+TEST_BURST = 10000  # ms
+
+CIR_OK = 8500       # CIR in kbps, above test rate
+CIR_LOW = 7000      # CIR in kbps, below test rate
+EIR_OK = 9000       # EIR in kbps, above test rate
+EIR_LOW = 7500      # EIR in kbps, below test rate
+
+NUM_PKTS = 20000
+
+CBURST = 100000     # Committed burst in bytes
+EBURST = 200000     # Excess burst in bytes
+
+
+class TestPolicer(VppTestCase):
+    """ Policer Test Case """
+
+    def setUp(self):
+        super(TestPolicer, self).setUp()
+
+    def tearDown(self):
+        super(TestPolicer, self).tearDown()
+
+    def run_policer_test(self, type, cir, cb, eir, eb, rate=8000, burst=10000,
+                         colour=0):
+        """
+        Configure a Policer and push traffic through it.
+        """
+        types = {
+            '1R2C': 0,
+            '1R3C': 1,
+            '2R3C': 3,
+        }
+
+        pol_type = types.get(type)
+        policer = VppPolicer(self, "pol1", cir, eir, cb, eb, rate_type=0,
+                             type=pol_type, color_aware=colour)
+        policer.add_vpp_config()
+
+        error = self.vapi.cli(
+            f"test policing index {policer.policer_index} rate {rate} "
+            f"burst {burst} colour {colour}")
+
+        stats = policer.get_stats()
+        policer.remove_vpp_config()
+
+        return stats
+
+    def test_policer_1r2c(self):
+        """ Single rate, 2 colour policer """
+        stats = self.run_policer_test("1R2C", CIR_OK, CBURST, 0, 0)
+        self.assertEqual(stats['conform_packets'], NUM_PKTS)
+
+        stats = self.run_policer_test("1R2C", CIR_LOW, CBURST, 0, 0)
+        self.assertLess(stats['conform_packets'], NUM_PKTS)
+        self.assertEqual(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("1R2C", CIR_LOW, CBURST, 0, 0, colour=2)
+        self.assertEqual(stats['violate_packets'], NUM_PKTS)
+
+    def test_policer_1r3c(self):
+        """ Single rate, 3 colour policer """
+        stats = self.run_policer_test("1R3C", CIR_OK, CBURST, 0, 0)
+        self.assertEqual(stats['conform_packets'], NUM_PKTS)
+
+        stats = self.run_policer_test("1R3C", CIR_LOW, CBURST, 0, EBURST)
+        self.assertLess(stats['conform_packets'], NUM_PKTS)
+        self.assertGreater(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("1R3C", CIR_LOW, CBURST, 0, EBURST,
+                                      colour=1)
+        self.assertEqual(stats['conform_packets'], 0)
+        self.assertGreater(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("1R3C", CIR_LOW, CBURST, 0, EBURST,
+                                      colour=2)
+        self.assertEqual(stats['violate_packets'], NUM_PKTS)
+
+    def test_policer_2r3c(self):
+        """ Dual rate, 3 colour policer """
+        stats = self.run_policer_test("2R3C", CIR_OK, CBURST, EIR_OK, EBURST)
+        self.assertEqual(stats['conform_packets'], NUM_PKTS)
+
+        stats = self.run_policer_test("2R3C", CIR_LOW, CBURST, EIR_OK, EBURST)
+        self.assertLess(stats['conform_packets'], NUM_PKTS)
+        self.assertGreater(stats['exceed_packets'], 0)
+        self.assertEqual(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("2R3C", CIR_LOW, CBURST, EIR_LOW, EBURST)
+        self.assertLess(stats['conform_packets'], NUM_PKTS)
+        self.assertGreater(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("2R3C", CIR_LOW, CBURST, EIR_OK, EBURST,
+                                      colour=1)
+        self.assertEqual(stats['exceed_packets'], NUM_PKTS)
+
+        stats = self.run_policer_test("2R3C", CIR_LOW, CBURST, EIR_LOW, EBURST,
+                                      colour=1)
+        self.assertEqual(stats['conform_packets'], 0)
+        self.assertGreater(stats['exceed_packets'], 0)
+        self.assertGreater(stats['violate_packets'], 0)
+
+        stats = self.run_policer_test("2R3C", CIR_LOW, CBURST, EIR_OK, EBURST,
+                                      colour=2)
+        self.assertEqual(stats['violate_packets'], NUM_PKTS)
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)