voltha/adapters/ponsim_onu/ponsim_onu.py

#
# Copyright 2016 the original author or authors.
#
# 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.
#

"""
Fully simulated OLT/ONU adapter.
"""

import structlog
from twisted.internet import reactor
from twisted.internet.defer import DeferredQueue, inlineCallbacks
from zope.interface import implementer

from voltha.adapters.interface import IAdapterInterface
from voltha.core.logical_device_agent import mac_str_to_tuple
from voltha.protos import third_party
from voltha.protos.adapter_pb2 import Adapter
from voltha.protos.adapter_pb2 import AdapterConfig
from voltha.protos.common_pb2 import LogLevel, OperStatus, ConnectStatus, \
    AdminState
from voltha.protos.device_pb2 import DeviceType, DeviceTypes, Port
from voltha.protos.health_pb2 import HealthStatus
from voltha.protos.logical_device_pb2 import LogicalPort
from voltha.protos.openflow_13_pb2 import OFPPS_LIVE, OFPPF_FIBER, OFPPF_1GB_FD
from voltha.protos.openflow_13_pb2 import ofp_port
from voltha.protos.ponsim_pb2 import FlowTable

_ = third_party
log = structlog.get_logger()


@implementer(IAdapterInterface)
class PonSimOnuAdapter(object):

    name = 'ponsim_onu'

    supported_device_types = [
        DeviceType(
            id=name,
            adapter=name,
            accepts_bulk_flow_update=True
        )
    ]

    def __init__(self, adapter_agent, config):
        self.adapter_agent = adapter_agent
        self.config = config
        self.descriptor = Adapter(
            id=self.name,
            vendor='Voltha project',
            version='0.4',
            config=AdapterConfig(log_level=LogLevel.INFO)
        )
        self.devices_handlers = dict()  # device_id -> PonSimOltHandler()

    def start(self):
        log.debug('starting')
        log.info('started')

    def stop(self):
        log.debug('stopping')
        log.info('stopped')

    def adapter_descriptor(self):
        return self.descriptor

    def device_types(self):
        return DeviceTypes(items=self.supported_device_types)

    def health(self):
        return HealthStatus(state=HealthStatus.HealthState.HEALTHY)

    def change_master_state(self, master):
        raise NotImplementedError()

    def adopt_device(self, device):
        self.devices_handlers[device.id] = PonSimOnuHandler(self, device.id)
        reactor.callLater(0, self.devices_handlers[device.id].activate, device)
        return device

    def abandon_device(self, device):
        raise NotImplementedError()

    def deactivate_device(self, device):
        raise NotImplementedError()

    def update_flows_bulk(self, device, flows, groups):
        log.info('bulk-flow-update', device_id=device.id,
                  flows=flows, groups=groups)
        assert len(groups.items) == 0
        handler = self.devices_handlers[device.id]
        return handler.update_flow_table(flows.items)

    def update_flows_incrementally(self, device, flow_changes, group_changes):
        raise NotImplementedError()

    def send_proxied_message(self, proxy_address, msg):
        log.info('send-proxied-message', proxy_address=proxy_address, msg=msg)

    def receive_proxied_message(self, proxy_address, msg):
        log.info('receive-proxied-message', proxy_address=proxy_address,
                 device_id=proxy_address.device_id, msg=msg)
        handler = self.devices_handlers[proxy_address.device_id]
        handler.receive_message(msg)

    def receive_packet_out(self, logical_device_id, egress_port_no, msg):
        log.info('packet-out', logical_device_id=logical_device_id,
                 egress_port_no=egress_port_no, msg_len=len(msg))


class PonSimOnuHandler(object):

    def __init__(self, adapter, device_id):
        self.adapter = adapter
        self.adapter_agent = adapter.adapter_agent
        self.device_id = device_id
        self.log = structlog.get_logger(device_id=device_id)
        self.incoming_messages = DeferredQueue()
        self.proxy_address = None

    def receive_message(self, msg):
        self.incoming_messages.put(msg)

    def activate(self, device):
        self.log.info('activating')

        # first we verify that we got parent reference and proxy info
        assert device.parent_id
        assert device.proxy_address.device_id
        assert device.proxy_address.channel_id

        # register for proxied messages right away
        self.proxy_address = device.proxy_address
        self.adapter_agent.register_for_proxied_messages(device.proxy_address)

        # populate device info
        device.root = True
        device.vendor = 'ponsim'
        device.model ='n/a'
        device.connect_status = ConnectStatus.REACHABLE
        self.adapter_agent.update_device(device)

        # register physical ports
        uni_port = Port(
            port_no=2,
            label='UNI facing Ethernet port',
            type=Port.ETHERNET_UNI,
            admin_state=AdminState.ENABLED,
            oper_status=OperStatus.ACTIVE
        )
        self.adapter_agent.add_port(device.id, uni_port)
        self.adapter_agent.add_port(device.id, Port(
            port_no=1,
            label='PON port',
            type=Port.PON_ONU,
            admin_state=AdminState.ENABLED,
            oper_status=OperStatus.ACTIVE,
            peers=[
                Port.PeerPort(
                    device_id=device.parent_id,
                    port_no=device.parent_port_no
                )
            ]
        ))

        # add uni port to logical device
        parent_device = self.adapter_agent.get_device(device.parent_id)
        logical_device_id = parent_device.parent_id
        assert logical_device_id
        port_no = device.proxy_address.channel_id
        cap = OFPPF_1GB_FD | OFPPF_FIBER
        self.adapter_agent.add_logical_port(logical_device_id, LogicalPort(
            id='uni-{}'.format(port_no),
            ofp_port=ofp_port(
                port_no=port_no,
                hw_addr=mac_str_to_tuple('00:00:00:00:00:%02x' % port_no),
                name='uni-{}'.format(port_no),
                config=0,
                state=OFPPS_LIVE,
                curr=cap,
                advertised=cap,
                peer=cap,
                curr_speed=OFPPF_1GB_FD,
                max_speed=OFPPF_1GB_FD
            ),
            device_id=device.id,
            device_port_no=uni_port.port_no
        ))

        device = self.adapter_agent.get_device(device.id)
        device.oper_status = OperStatus.ACTIVE
        self.adapter_agent.update_device(device)

    @inlineCallbacks
    def update_flow_table(self, flows):

        # we need to proxy through the OLT to get to the ONU

        # reset response queue
        while self.incoming_messages.pending:
            yield self.incoming_messages.get()

        msg = FlowTable(
            port=self.proxy_address.channel_id,
            flows=flows
        )
        self.adapter_agent.send_proxied_message(self.proxy_address, msg)

        yield self.incoming_messages.get()