Hi,
I am trying to use flow monitoring feature from OF 1.4. I see that I can
configure OVS successful to do flow monitoring via ovs-ofctl commands as
follows:
root@mininet:/setup# ovs-ofctl monitor s1 watch:\!initial
NXST_FLOW_MONITOR reply (xid=0x4):
NXST_FLOW_MONITOR reply (xid=0x0):
event=ADDED table=1 cookie=0xa in_port="s1-eth1" actions=resubmit(,2)
NXST_FLOW_MONITOR reply (xid=0x0):
event=DELETED reason=delete table=1 cookie=0xa in_port="s1-eth1"
actions=resubmit(,2)
And I could see the events properly.
Now I would like to extend ryu to do the same. So, I
took SimpleMonitor13.py and modified it to be derived from
simple_switch_14.SimpleSwitch14. And then in _state_change_handler function
added a call to do:
for dp in self.datapaths.values():
self.send_flow_monitor_request(dp)
send_flow_monitor_request() is the example code as provided documentation
def send_flow_monitor_request(self, datapath):
ofp = datapath.ofproto
ofp_parser = datapath.ofproto_parser
monitor_flags = [ofp.OFPFMF_INITIAL, ofp.OFPFMF_ONLY_OWN]
match = ofp_parser.OFPMatch(in_port=1)
req = ofp_parser.OFPFlowMonitorRequest(datapath, 0, 10000,
ofp.OFPP_ANY, ofp.OFPG_ANY,
monitor_flags,
ofp.OFPTT_ALL,
ofp.OFPFMC_ADD, match)
datapath.send_msg(req)
I see following error:
==========
SimpleMonitor14: Exception occurred during handler processing. Backtrace
from offending handler [_state_change_handler] servicing event
[EventOFPStateChange] follows.
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py",
line 290, in _event_loop
handler(ev)
File "/Users/vdasari/Developer/ryu/ryu/app/simple_monitor_13.py", line
41, in _state_change_handler
self.send_flow_monitor_request(dp)
File "/Users/vdasari/Developer/ryu/ryu/app/simple_monitor_13.py", line
110, in send_flow_monitor_request
datapath.send_msg(req)
File
"/usr/local/lib/python2.7/dist-packages/ryu/controller/controller.py", line
344, in send_msg
msg.serialize()
File
"/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_parser.py",
line 220, in serialize
self._serialize_body()
File
"/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_4_parser.py",
line 1450, in _serialize_body
self._serialize_stats_body()
File
"/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_4_parser.py",
line 3171, in _serialize_stats_body
self.monitor_flags, self.table_id, self.command)
File "/usr/local/lib/python2.7/dist-packages/ryu/lib/pack_utils.py", line
25, in msg_pack_into
struct.pack_into(fmt, buf, offset, *args)
error: cannot convert argument to integer
==========
Can you help me what is wrong with code? I am attaching the file as well.
Thanks
-Vasu
*Vasu Dasari*
# Copyright (C) 2016 Nippon Telegraph and Telephone 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.
from operator import attrgetter
from ryu.app import simple_switch_14
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER, DEAD_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.lib import hub
class SimpleMonitor14(simple_switch_14.SimpleSwitch14):
def __init__(self, *args, **kwargs):
super(SimpleMonitor14, self).__init__(*args, **kwargs)
self.datapaths = {}
self.monitor_thread = hub.spawn(self._monitor)
@set_ev_cls(ofp_event.EventOFPStateChange,
[MAIN_DISPATCHER, DEAD_DISPATCHER])
def _state_change_handler(self, ev):
datapath = ev.datapath
if ev.state == MAIN_DISPATCHER:
if datapath.id not in self.datapaths:
self.logger.info('register datapath: %016x', datapath.id)
self.datapaths[datapath.id] = datapath
for dp in self.datapaths.values():
self.send_flow_monitor_request(dp)
elif ev.state == DEAD_DISPATCHER:
if datapath.id in self.datapaths:
self.logger.debug('unregister datapath: %016x', datapath.id)
del self.datapaths[datapath.id]
def _monitor(self):
while True:
for dp in self.datapaths.values():
self._request_stats(dp)
hub.sleep(10)
def _request_stats(self, datapath):
self.logger.debug('send stats request: %016x', datapath.id)
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
req = parser.OFPFlowStatsRequest(datapath)
datapath.send_msg(req)
req = parser.OFPPortStatsRequest(datapath, 0, ofproto.OFPP_ANY)
datapath.send_msg(req)
@set_ev_cls(ofp_event.EventOFPFlowStatsReply, MAIN_DISPATCHER)
def _flow_stats_reply_handler(self, ev):
body = ev.msg.body
self.logger.info('datapath '
'in-port eth-dst '
'out-port packets bytes')
self.logger.info('---------------- '
'-------- ----------------- '
'-------- -------- --------')
for stat in sorted([flow for flow in body if flow.priority == 1],
key=lambda flow: (flow.match['in_port'],
flow.match['eth_dst'])):
self.logger.info('%016x %8x %17s %8x %8d %8d',
ev.msg.datapath.id,
stat.match['in_port'], stat.match['eth_dst'],
stat.instructions[0].actions[0].port,
stat.packet_count, stat.byte_count)
@set_ev_cls(ofp_event.EventOFPPortStatsReply, MAIN_DISPATCHER)
def _port_stats_reply_handler(self, ev):
body = ev.msg.body
self.logger.info('datapath port '
'rx-pkts rx-bytes rx-error '
'tx-pkts tx-bytes tx-error')
self.logger.info('---------------- -------- '
'-------- -------- -------- '
'-------- -------- --------')
for stat in sorted(body, key=attrgetter('port_no')):
self.logger.info('%016x %8x %8d %8d %8d %8d %8d %8d',
ev.msg.datapath.id, stat.port_no,
stat.rx_packets, stat.rx_bytes, stat.rx_errors,
stat.tx_packets, stat.tx_bytes, stat.tx_errors)
def send_flow_monitor_request(self, datapath):
ofp = datapath.ofproto
ofp_parser = datapath.ofproto_parser
monitor_flags = [ofp.OFPFMF_INITIAL, ofp.OFPFMF_ONLY_OWN]
match = ofp_parser.OFPMatch(in_port=1)
req = ofp_parser.OFPFlowMonitorRequest(datapath, 0, 10000,
ofp.OFPP_ANY, ofp.OFPG_ANY,
monitor_flags,
ofp.OFPTT_ALL,
ofp.OFPFMC_ADD, match)
datapath.send_msg(req)
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