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path: root/src/vnet/policer/test/test_policer_input.py
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#!/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)