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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, Dir
NUM_PKTS = 67
class TestPolicerInput(VppTestCase):
""" Policer on an interface """
vpp_worker_count = 2
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 policer_interface_test(self, dir: Dir):
pkts = self.pkt * NUM_PKTS
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()
sw_if_index = (self.pg0.sw_if_index
if dir == Dir.RX
else self.pg1.sw_if_index)
# Start policing on pg0
policer.apply_vpp_config(sw_if_index, dir, True)
rx = self.send_and_expect(self.pg0, pkts, self.pg1, worker=0)
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(sw_if_index, dir, False)
rx = self.send_and_expect(self.pg0, pkts, self.pg1, worker=0)
statsnew = policer.get_stats()
# No new packets counted
self.assertEqual(stats, statsnew)
policer.remove_vpp_config()
def test_policer_input(self):
""" Input Policing """
self.policer_interface_test(Dir.RX)
def test_policer_output(self):
""" Output Policing """
self.policer_interface_test(Dir.TX)
def policer_handoff_test(self, dir: Dir):
pkts = self.pkt * NUM_PKTS
action_tx = PolicerAction(
VppEnum.vl_api_sse2_qos_action_type_t.SSE2_QOS_ACTION_API_TRANSMIT,
0)
policer = VppPolicer(self, "pol2", 80, 0, 1000, 0,
conform_action=action_tx,
exceed_action=action_tx,
violate_action=action_tx)
policer.add_vpp_config()
sw_if_index = (self.pg0.sw_if_index
if dir == Dir.RX
else self.pg1.sw_if_index)
# Bind the policer to worker 1
policer.bind_vpp_config(1, True)
# Start policing on pg0
policer.apply_vpp_config(sw_if_index, dir, True)
for worker in [0, 1]:
self.send_and_expect(self.pg0, pkts, self.pg1, worker=worker)
self.logger.debug(self.vapi.cli("show trace max 100"))
stats = policer.get_stats()
stats0 = policer.get_stats(worker=0)
stats1 = policer.get_stats(worker=1)
# Worker 1, should have done all the policing
self.assertEqual(stats, stats1)
# Worker 0, should have handed everything off
self.assertEqual(stats0['conform_packets'], 0)
self.assertEqual(stats0['exceed_packets'], 0)
self.assertEqual(stats0['violate_packets'], 0)
# Unbind the policer from worker 1 and repeat
policer.bind_vpp_config(1, False)
for worker in [0, 1]:
self.send_and_expect(self.pg0, pkts, self.pg1, worker=worker)
self.logger.debug(self.vapi.cli("show trace max 100"))
# The policer should auto-bind to worker 0 when packets arrive
stats = policer.get_stats()
# The 2 workers should now have policed the same amount
stats = policer.get_stats()
stats0 = policer.get_stats(worker=0)
stats1 = policer.get_stats(worker=1)
self.assertGreater(stats0['conform_packets'], 0)
self.assertEqual(stats0['exceed_packets'], 0)
self.assertGreater(stats0['violate_packets'], 0)
self.assertGreater(stats1['conform_packets'], 0)
self.assertEqual(stats1['exceed_packets'], 0)
self.assertGreater(stats1['violate_packets'], 0)
self.assertEqual(stats0['conform_packets'] + stats1['conform_packets'],
stats['conform_packets'])
self.assertEqual(stats0['violate_packets'] + stats1['violate_packets'],
stats['violate_packets'])
# Stop policing on pg0
policer.apply_vpp_config(sw_if_index, dir, False)
policer.remove_vpp_config()
def test_policer_handoff_input(self):
""" Worker thread handoff policer input"""
self.policer_handoff_test(Dir.RX)
def test_policer_handoff_output(self):
""" Worker thread handoff policer output"""
self.policer_handoff_test(Dir.TX)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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