path: root/resources/libraries/python/TrafficGenerator.py

# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Performance testing traffic generator library."""

from robot.api import logger
from robot.libraries.BuiltIn import BuiltIn
from robot.api.deco import keyword

from resources.libraries.python.ssh import SSH
from resources.libraries.python.topology import NodeType
from resources.libraries.python.topology import NodeSubTypeTG
from resources.libraries.python.topology import Topology
from resources.libraries.python.DropRateSearch import DropRateSearch

__all__ = ['TrafficGenerator', 'TGDropRateSearchImpl']

class TGDropRateSearchImpl(DropRateSearch):
    """Drop Rate Search implementation"""

    def __init__(self):
        super(TGDropRateSearchImpl, self).__init__()

    def measure_loss(self, rate, frame_size, loss_acceptance,
                     loss_acceptance_type, traffic_type):

        #we need instance of TrafficGenerator instantiated by Robot Framework
        #to be able to use trex_stateless_remote_exec method
        tg_instance = BuiltIn().get_library_instance('resources.libraries.python.TrafficGenerator')

        if tg_instance._node['subtype'] is None:
            raise Exception('TG subtype not defined')
        elif tg_instance._node['subtype'] == NodeSubTypeTG.TREX:
            unit_rate = str(rate) + self.get_rate_type_str()
            tg_instance.trex_stateless_remote_exec(self.get_duration(), unit_rate,
                                                   frame_size, traffic_type)

            #TODO:getters for tg_instance and loss_acceptance_type
            logger.trace("comparing: {} < {} ".format(tg_instance._loss, loss_acceptance))
            if float(tg_instance._loss) > float(loss_acceptance):
                return False
            else:
                return True
        else:
            raise NotImplementedError("TG subtype not supported")

class TrafficGenerator(object):
    """Traffic Generator"""

    #use one instance of TrafficGenerator for all tests in test suite
    ROBOT_LIBRARY_SCOPE = 'TEST SUITE'

    def __init__(self):
        self._result = None
        self._loss = None
        self._sent = None
        self._received = None
        self._node = None
        #T-REX interface order mapping
        self._ifaces_reordered = 0

    def initialize_traffic_generator(self, tg_node, tg_if1, tg_if2,
                                     dut1_node, dut1_if1, dut1_if2,
                                     dut2_node, dut2_if1, dut2_if2,
                                     test_type):
        """TG initialization
        :param tg_node: Traffic generator node
        :param tg_if1: TG - name of first interface
        :param tg_if2: TG - name of second interface
        :param dut1_node: DUT1 node
        :param dut1_if1: DUT1 - name of first interface
        :param dut1_if2: DUT1 - name of second interface
        :param dut2_node: DUT2 node
        :param dut2_if1: DUT2 - name of first interface
        :param dut2_if2: DUT2 - name of second interface
        :test_type: 'L2' or 'L3' - src/dst MAC address
        :type tg_node: dict
        :type tg_if1: str
        :type tg_if2: str
        :type dut1_node: dict
        :type dut1_if1: str
        :type dut1_if2: str
        :type dut2_node: dict
        :type dut2_if1: str
        :type dut2_if2: str
        :type test_type: str
        :return: nothing
        """

        trex_path = "/opt/trex-core-1.91"

        topo = Topology()

        if tg_node['type'] != NodeType.TG:
            raise Exception('Node type is not a TG')
        self._node = tg_node

        if tg_node['subtype'] == NodeSubTypeTG.TREX:
            ssh = SSH()
            ssh.connect(tg_node)

            if1_pci = topo.get_interface_pci_addr(tg_node, tg_if1)
            if2_pci = topo.get_interface_pci_addr(tg_node, tg_if2)
            if1_mac = topo.get_interface_mac(tg_node, tg_if1)
            if2_mac = topo.get_interface_mac(tg_node, tg_if2)

            if test_type == 'L2':
                if1_adj_mac = if2_mac
                if2_adj_mac = if1_mac
            elif test_type == 'L3':
                if1_adj_mac = topo.get_interface_mac(dut1_node, dut1_if1)
                if2_adj_mac = topo.get_interface_mac(dut2_node, dut2_if2)
            else:
                raise Exception("test_type unknown")

            if min(if1_pci, if2_pci) != if1_pci:
                if1_mac, if2_mac = if2_mac, if1_mac
                if1_pci, if2_pci = if2_pci, if1_pci
                if1_adj_mac, if2_adj_mac = if2_adj_mac, if1_adj_mac
                self._ifaces_reordered = 1

            if1_mac_hex = "0x"+if1_mac.replace(":", ",0x")
            if2_mac_hex = "0x"+if2_mac.replace(":", ",0x")
            if1_adj_mac_hex = "0x"+if1_adj_mac.replace(":", ",0x")
            if2_adj_mac_hex = "0x"+if2_adj_mac.replace(":", ",0x")

            (ret, stdout, stderr) = ssh.exec_command(
                "sudo sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
                "- port_limit      : 2\n"
                "  version         : 2\n"
                "  interfaces      : [\"{}\",\"{}\"]\n"
                "  port_bandwidth_gb : 10\n"
                "  port_info       :\n"
                "          - dest_mac        :   [{}]\n"
                "            src_mac         :   [{}]\n"
                "          - dest_mac        :   [{}]\n"
                "            src_mac         :   [{}]\n"
                "EOF'"\
                .format(if1_pci, if2_pci,
                        if1_adj_mac_hex, if1_mac_hex,
                        if2_adj_mac_hex, if2_mac_hex))
            if int(ret) != 0:
                logger.error("failed to create t-rex config: {}"\
                .format(stdout + stderr))
                raise RuntimeError('trex config generation error')

            (ret, stdout, stderr) = ssh.exec_command(
                "sh -c 'cd {0}/scripts/ && "
                "sudo ./trex-cfg'"\
                .format(trex_path))
            if int(ret) != 0:
                logger.error('trex-cfg failed: {0}'.format(stdout + stderr))
                raise RuntimeError('trex-cfg failed')

            (ret, _, _) = ssh.exec_command(
                "sh -c 'cd {0}/scripts/ && "
                "sudo nohup ./t-rex-64 -i -c 4 --iom 0 > /dev/null 2>&1 &'"
                "> /dev/null"\
                .format(trex_path))
            if int(ret) != 0:
                raise RuntimeError('t-rex-64 startup failed')

    @staticmethod
    def teardown_traffic_generator(node):
        """TG teardown
        :param node: Traffic generator node
        :type node: dict
        :return: nothing
        """

        if node['type'] != NodeType.TG:
            raise Exception('Node type is not a TG')
        if node['subtype'] == NodeSubTypeTG.TREX:
            ssh = SSH()
            ssh.connect(node)
            (ret, stdout, stderr) = ssh.exec_command(
                "sh -c 'sudo pkill t-rex'")
            if int(ret) != 0:
                logger.error('pkill t-rex failed: {0}'.format(stdout + stderr))
                raise RuntimeError('pkill t-rex failed')

    def trex_stateless_remote_exec(self, duration, rate, framesize,
                                   traffic_type):
        """Execute stateless script on remote node over ssh

        :param node: remote node
        :param traffic_type: Traffic profile
        :type node: dict
        :type traffic_type: str
        """
        ssh = SSH()
        ssh.connect(self._node)

        _p0 = 1
        _p1 = 2

        if self._ifaces_reordered != 0:
            _p0, _p1 = _p1, _p0

        if traffic_type in ["3-node-xconnect", "3-node-bridge"]:
            (ret, stdout, stderr) = ssh.exec_command(
                "sh -c '/tmp/openvpp-testing/resources/tools/t-rex/"
                "t-rex-stateless.py "
                "-d {0} -r {1} -s {2} "
                "--p{3}_src_start_ip 10.10.10.1 "
                "--p{3}_src_end_ip 10.10.10.254 "
                "--p{3}_dst_start_ip 20.20.20.1 "
                "--p{4}_src_start_ip 20.20.20.1 "
                "--p{4}_src_end_ip 20.20.20.254 "
                "--p{4}_dst_start_ip 10.10.10.1'".\
                format(duration, rate, framesize, _p0, _p1),\
                timeout=int(duration)+60)
        elif traffic_type in ["3-node-IPv4"]:
            (ret, stdout, stderr) = ssh.exec_command(
                "sh -c '/tmp/openvpp-testing/resources/tools/t-rex/"
                "t-rex-stateless.py "
                "-d {0} -r {1} -s {2} "
                "--p{3}_src_start_ip 10.10.10.2 "
                "--p{3}_src_end_ip 10.10.10.254 "
                "--p{3}_dst_start_ip 20.20.20.2 "
                "--p{4}_src_start_ip 20.20.20.2 "
                "--p{4}_src_end_ip 20.20.20.254 "
                "--p{4}_dst_start_ip 10.10.10.2'".\
                format(duration, rate, framesize, _p0, _p1),\
                timeout=int(duration)+60)
        else:
            raise NotImplementedError('Unsupported traffic type')

        logger.trace(ret)
        logger.trace(stdout)
        logger.trace(stderr)

        #last line from console output
        line = stdout.splitlines()[-1]

        self._result = line
        logger.info('TrafficGen result: {0}'.format(self._result))

        self._received = self._result.split(', ')[1].split('=')[1]
        self._sent = self._result.split(', ')[2].split('=')[1]
        self._loss = self._result.split(', ')[3].split('=')[1]

    def send_traffic_on(self, node, duration, rate,
                        framesize, traffic_type):
        """Send traffic from all configured interfaces on TG
        :param node: Dictionary containing TG information
        :param duration: Duration of test traffic generation in seconds
        :param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...)
        :param framesize: Frame size (L2) in Bytes
        :param traffic_type: Traffic profile
        :type node: dict
        :type duration: str
        :type rate: str
        :type framesize: str
        :type traffic_type: str
        :return: TG output
        :rtype: str
        """

        if node['type'] != NodeType.TG:
            raise Exception('Node type is not a TG')

        if node['subtype'] is None:
            raise Exception('TG subtype not defined')
        elif node['subtype'] == NodeSubTypeTG.TREX:
            self.trex_stateless_remote_exec(duration, rate, framesize,
                                            traffic_type)
        else:
            raise NotImplementedError("TG subtype not supported")

        return self._result

    def no_traffic_loss_occured(self):
        """Fail is loss occured in traffic run
        :return: nothing
        """

        if self._loss is None:
            raise Exception('The traffic generation has not been issued')
        if self._loss != '0':
            raise Exception('Traffic loss occured: {0}'.format(self._loss))