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# Copyright 2016 Intel Corporation.
#
# 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 logging
import netaddr
from core.vswitch_controller import IVswitchController
from vswitches.utils import add_ports_to_flow
from conf import settings
_FLOW_TEMPLATE = {
'idle_timeout': '0'
}
_PROTO_TCP = 6
_PROTO_UDP = 17
class VswitchControllerPXP(IVswitchController):
"""VSwitch controller for PXP deployment scenario.
"""
def __init__(self, deployment, vswitch_class, traffic):
"""Initializes up the prerequisites for the PXP deployment scenario.
:vswitch_class: the vSwitch class to be used.
:deployment: the deployment scenario to configure
:traffic: dictionary with detailed traffic definition
"""
self._logger = logging.getLogger(__name__)
self._vswitch_class = vswitch_class
self._vswitch = vswitch_class()
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._traffic = traffic.copy()
self._bidir = True if self._traffic['bidir'] == 'True' else False
self._logger.debug('Creation using ' + str(self._vswitch_class))
self._bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
def setup(self):
""" Sets up the switch for PXP
"""
self._logger.debug('Setup using ' + str(self._vswitch_class))
try:
self._vswitch.start()
self._vswitch.add_switch(self._bridge)
# create physical ports
(_, phy1_number) = self._vswitch.add_phy_port(self._bridge)
(_, phy2_number) = 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)
self._vswitch.del_flow(self._bridge)
# configure flows according to the TC definition
if self._pxp_topology == 'serial':
flow = _FLOW_TEMPLATE.copy()
if self._traffic['flow_type'] == 'IP':
flow.update({'dl_type':'0x0800',
'nw_src':self._traffic['l3']['srcip'],
'nw_dst':self._traffic['l3']['dstip']})
# insert flows for phy ports first
# from 1st PHY to 1st vport of 1st VM
self._add_flow(flow,
phy1_number,
vm_ports[0][0],
self._bidir)
# from last vport of last VM to 2nd phy
self._add_flow(flow,
vm_ports[self._pxp_vm_count-1][-1],
phy2_number,
self._bidir)
# 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 flow 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._add_flow(flow,
connection[0],
connection[1],
self._bidir)
# connect last NICs to the next VM if there is any
if self._pxp_vm_count > vmindex + 1:
self._add_flow(flow,
vm_ports[vmindex][-1],
vm_ports[vmindex+1][0],
self._bidir)
else:
proto = _PROTO_TCP if self._traffic['l3']['proto'].lower() == 'tcp' else _PROTO_UDP
dst_mac_value = netaddr.EUI(self._traffic['l2']['dstmac']).value
dst_ip_value = netaddr.IPAddress(self._traffic['l3']['dstip']).value
# 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:
flow_p = _FLOW_TEMPLATE.copy()
flow_v = _FLOW_TEMPLATE.copy()
# update flow based on trafficgen settings
if self._traffic['stream_type'] == 'L2':
tmp_mac = netaddr.EUI(dst_mac_value + stream)
tmp_mac.dialect = netaddr.mac_unix_expanded
flow_p.update({'dl_dst':tmp_mac})
elif self._traffic['stream_type'] == 'L3':
tmp_ip = netaddr.IPAddress(dst_ip_value + stream)
flow_p.update({'dl_type':'0x0800', 'nw_dst':tmp_ip})
elif self._traffic['stream_type'] == 'L4':
flow_p.update({'dl_type':'0x0800', 'nw_proto':proto, 'tp_dst':stream})
else:
raise RuntimeError('Unknown stream_type {}'.format(self._traffic['stream_type']))
# insert flow 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._add_flow(flow_p, phy1_number, port_pair[0])
self._add_flow(flow_v, port_pair[1], phy2_number)
if self._bidir:
self._add_flow(flow_p, phy2_number, port_pair[1])
self._add_flow(flow_v, port_pair[0], phy1_number)
# 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 ' + str(self._vswitch_class))
self._vswitch.stop()
def _add_flow(self, flow, port1, port2, reverse_flow=False):
""" Helper method to insert flow into the vSwitch
"""
self._vswitch.add_flow(self._bridge,
add_ports_to_flow(flow,
port1,
port2))
if reverse_flow:
self._vswitch.add_flow(self._bridge,
add_ports_to_flow(flow,
port2,
port1))
def __enter__(self):
self.setup()
def __exit__(self, type_, value, traceback):
self.stop()
def get_vswitch(self):
"""See IVswitchController for description
"""
return self._vswitch
def get_ports_info(self):
"""See IVswitchController for description
"""
self._logger.debug('get_ports_info using ' + str(self._vswitch_class))
return self._vswitch.get_ports(self._bridge)
def dump_vswitch_flows(self):
"""See IVswitchController for description
"""
self._vswitch.dump_flows(self._bridge)
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