def process_flow_template(self, bridge, flow_template):
"""Method adds flows into the vswitch based on given flow template
and configuration of multistream feature.
"""
if ('pre_installed_flows' in self._traffic and
self._traffic['pre_installed_flows'].lower() == 'yes' and
'multistream' in self._traffic and self._traffic['multistream'] > 0 and
'stream_type' in self._traffic):
# multistream feature is enabled and flows should be inserted into OVS
# so generate flows based on template and multistream configuration
if self._traffic['stream_type'] == 'L2':
# iterate through destimation MAC address
dst_mac_value = netaddr.EUI(self._traffic['l2']['dstmac']).value
for i in range(self._traffic['multistream']):
tmp_mac = netaddr.EUI(dst_mac_value + i)
tmp_mac.dialect = netaddr.mac_unix_expanded
flow_template.update({'dl_dst':tmp_mac})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
elif self._traffic['stream_type'] == 'L3':
# iterate through destimation IP address
dst_ip_value = netaddr.IPAddress(self._traffic['l3']['dstip']).value
for i in range(self._traffic['multistream']):
tmp_ip = netaddr.IPAddress(dst_ip_value + i)
flow_template.update({'dl_type':'0x0800', 'nw_dst':tmp_ip})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
elif self._traffic['stream_type'] == 'L4':
# read transport protocol from configuration and iterate through its destination port
proto = _PROTO_TCP if self._traffic['l3']['proto'].lower() == 'tcp' else _PROTO_UDP
for i in range(self._traffic['multistream']):
flow_template.update({'dl_type':'0x0800', 'nw_proto':proto, 'tp_dst':i})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
else:
self._logger.error('Stream type is set to uknown value %s', self._traffic['stream_type'])
# insert cached flows into the OVS
self._vswitch.add_flow(bridge, [], cache='flush')
else:
self._vswitch.add_flow(bridge, flow_template)
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