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# Copyright 2016-2018 Intel Corporation., Tieto
#
# 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.
"""VSwitch controller for multi VM scenarios with serial or parallel connection
"""
import netaddr
from core.vswitch_controller import IVswitchController
from conf import settings
class VswitchControllerPXP(IVswitchController):
"""VSwitch controller for PXP deployment scenario.
"""
def __init__(self, deployment, vswitch_class, traffic):
"""See IVswitchController for general description
"""
super().__init__(deployment, vswitch_class, traffic)
self._pxp_topology = 'parallel' if deployment.startswith('pvpv') else 'serial'
if deployment == 'pvp':
self._pxp_vm_count = 1
elif deployment.startswith('pvvp') or deployment.startswith('pvpv'):
if len(deployment) > 4:
self._pxp_vm_count = int(deployment[4:])
else:
self._pxp_vm_count = 2
else:
raise RuntimeError('Unknown number of VMs involved in {} deployment.'.format(deployment))
self._deployment_scenario = deployment
self._bidir = True if self._traffic['bidir'] == 'True' else False
self._bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
def setup(self):
""" Sets up the switch for PXP
"""
self._logger.debug('Setup using %s', str(self._vswitch_class))
try:
self._vswitch.start()
self._vswitch.add_switch(self._bridge)
# create physical ports
(phy1, _) = self._vswitch.add_phy_port(self._bridge)
(phy2, _) = self._vswitch.add_phy_port(self._bridge)
# create VM ports
# initialize vport array to requested number of VMs
guest_nics = settings.getValue('GUEST_NICS_NR')
vm_ports = [[] for _ in range(self._pxp_vm_count)]
# create as many VM ports as requested by configuration, but configure
# only even number of NICs or just one
for vmindex in range(self._pxp_vm_count):
# just for case, enforce even number of NICs or 1
nics_nr = int(guest_nics[vmindex] / 2) * 2 if guest_nics[vmindex] > 1 else 1
self._logger.debug('Create %s vports for %s. VM with index %s',
nics_nr, vmindex + 1, vmindex)
for _ in range(nics_nr):
(vport, _) = self._vswitch.add_vport(self._bridge)
vm_ports[vmindex].append(vport)
# configure connections according to the TC definition
if self._pxp_topology == 'serial':
# NOTE: all traffic from VMs is sent to other ports directly
# without applying traffic options to avoid issues with MAC swapping
# and upper layer mods performed inside guests
# insert connections for phy ports first
# from 1st PHY to 1st vport of 1st VM
self._vswitch.add_connection(self._bridge, phy1, vm_ports[0][0], self._traffic)
self._vswitch.add_connection(self._bridge, vm_ports[0][0], phy1)
# from last vport of last VM to 2nd phy
self._vswitch.add_connection(self._bridge, vm_ports[self._pxp_vm_count-1][-1], phy2)
self._vswitch.add_connection(self._bridge, phy2, vm_ports[self._pxp_vm_count-1][-1], self._traffic)
# add serial connections among VMs and VM NICs pairs if needed
# in case of multiple NICs pairs per VM, the pairs are chained
# first, before connection to the next VM is created
for vmindex in range(self._pxp_vm_count):
# connect VMs NICs pairs in case of 4 and more NICs per VM
connections = [(vm_ports[vmindex][2*(x+1)-1],
vm_ports[vmindex][2*(x+1)])
for x in range(int(len(vm_ports[vmindex])/2)-1)]
for connection in connections:
self._vswitch.add_connection(self._bridge, connection[0], connection[1])
self._vswitch.add_connection(self._bridge, connection[1], connection[0])
# connect last NICs to the next VM if there is any
if self._pxp_vm_count > vmindex + 1:
self._vswitch.add_connection(self._bridge, vm_ports[vmindex][-1], vm_ports[vmindex+1][0])
self._vswitch.add_connection(self._bridge, vm_ports[vmindex+1][0], vm_ports[vmindex][-1])
else:
mac_value = netaddr.EUI(self._traffic['l2']['dstmac']).value
ip_value = netaddr.IPAddress(self._traffic['l3']['dstip']).value
port_value = self._traffic['l4']['dstport']
# initialize stream index; every NIC pair of every VM uses unique stream
stream = 0
for vmindex in range(self._pxp_vm_count):
# iterate through all VMs NIC pairs...
if len(vm_ports[vmindex]) > 1:
port_pairs = [(vm_ports[vmindex][2*x],
vm_ports[vmindex][2*x+1]) for x in range(int(len(vm_ports[vmindex])/2))]
else:
# ...or connect VM with just one NIC to both phy ports
port_pairs = [(vm_ports[vmindex][0], vm_ports[vmindex][0])]
for port_pair in port_pairs:
# override traffic options to ensure, that traffic is
# dispatched among VMs connected in parallel
options = {'multistream':1,
'stream_type':self._traffic['stream_type'],
'pre_installed_flows':'Yes'}
# update connection based on trafficgen settings
if self._traffic['stream_type'] == 'L2':
tmp_mac = netaddr.EUI(mac_value + stream)
tmp_mac.dialect = netaddr.mac_unix_expanded
options.update({'l2':{'dstmac':tmp_mac}})
elif self._traffic['stream_type'] == 'L3':
tmp_ip = netaddr.IPAddress(ip_value + stream)
options.update({'l3':{'dstip':tmp_ip}})
elif self._traffic['stream_type'] == 'L4':
options.update({'l3':{'proto':self._traffic['l3']['proto']}})
options.update({'l4':{'dstport':(port_value + stream) % 65536}})
else:
raise RuntimeError('Unknown stream_type {}'.format(self._traffic['stream_type']))
# insert connection to dispatch traffic from physical ports
# to VMs based on stream type; all traffic from VMs is
# sent to physical ports to avoid issues with MAC swapping
# and upper layer mods performed inside guests
self._vswitch.add_connection(self._bridge, phy1, port_pair[0], options)
self._vswitch.add_connection(self._bridge, port_pair[1], phy2)
self._vswitch.add_connection(self._bridge, phy2, port_pair[1], options)
self._vswitch.add_connection(self._bridge, port_pair[0], phy1)
# every NIC pair needs its own unique traffic stream
stream += 1
except:
self._vswitch.stop()
raise
def stop(self):
"""Tears down the switch created in setup().
"""
self._logger.debug('Stop using %s', str(self._vswitch_class))
self._vswitch.stop()
def get_ports_info(self):
"""See IVswitchController for description
"""
self._logger.debug('get_ports_info using %s', str(self._vswitch_class))
return self._vswitch.get_ports(self._bridge)
def dump_vswitch_connections(self):
"""See IVswitchController for description
"""
self._vswitch.dump_connections(self._bridge)
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