[ovs-discuss] OFPET_FLOW_MOD_FAILED

Ben Pfaff blp at ovn.org
Thu Nov 3 14:09:12 UTC 2016


I don't see how this is connected to Open vSwitch.  Do you have a
question related to Open vSwitch?

On Thu, Nov 03, 2016 at 05:14:38AM -0400, Ajinkya D Kadam wrote:
> HI All,
> 
> I am doing a simple experiment to add a default table miss flow entry to a
> hardware OpenFlow Switch. Below are the details of the tools I  am using
> 
> Controller : RYU
> OpenFlow Switch : FortiCore 3700E
> OF_version : 1.3
> 
> I am using the example code (example_switch_13.py) available in ryu/app.
> 
> 
> *ERROR :*
> 
> loading app ryu/ryu/app/example_switch_13.py
> loading app ryu.controller.ofp_handler
> instantiating app ryu/ryu/app/example_switch_13.py of ExampleSwitch13
> instantiating app ryu.controller.ofp_handler of OFPHandler
> BRICK ExampleSwitch13
>   CONSUMES EventOFPPacketIn
>   CONSUMES EventOFPSwitchFeatures
> BRICK ofp_event
>   PROVIDES EventOFPPacketIn TO {'ExampleSwitch13': set(['main'])}
>   PROVIDES EventOFPSwitchFeatures TO {'ExampleSwitch13': set(['config'])}
>   CONSUMES EventOFPSwitchFeatures
>   CONSUMES EventOFPErrorMsg
>   CONSUMES EventOFPEchoRequest
>   CONSUMES EventOFPEchoReply
>   CONSUMES EventOFPHello
>   CONSUMES EventOFPPortStatus
>   CONSUMES EventOFPPortDescStatsReply
> connected socket:<eventlet.greenio.base.GreenSocket object at
> 0x7fddad9259d0> address:('10.2.1.35', 25656)
> hello ev <ryu.controller.ofp_event.EventOFPHello object at 0x7fddad932290>
> move onto config mode
> EVENT ofp_event->ExampleSwitch13 EventOFPSwitchFeatures
> switch features ev version=0x4,msg_type=0x6,msg_len=0x20,xid=0xa5440ccd,
> OFPSwitchFeatures(auxiliary_id=0,capabilities=5,datapath_
> id=158796421868064,n_buffers=0,n_tables=1)
> 
> 
> This is the port :   4294967293
> Buffer Id is :  65535
> 
> 
> 
> Actions :  [OFPActionOutput(len=16,max_len=65535,port=6633,type=0)]
> 
> 
> Instructions :  [OFPInstructionActions(actions=[OFPActionOutput(len=
> 16,max_len=65535,port=6633,type=0)],type=4)]
> 
> 
> modification  :  version=None,msg_type=None,msg_len=None,xid=None,
> OFPFlowMod(buffer_id=65535,command=0,cookie=0,cookie_
> mask=0,flags=0,hard_timeout=0,idle_timeout=0,instructions=[
> OFPInstructionActions(actions=[OFPActionOutput(len=16,max_
> len=65535,port=6633,type=0)],type=4)],match=OFPMatch(oxm_
> fields={}),out_group=0,out_port=0,priority=0,table_id=0)
> 
> move onto main mode
> EventOFPErrorMsg received.
> version=0x4, msg_type=0x1, msg_len=0x4c, xid=0xa5440ccf
>  `-- msg_type: OFPT_ERROR(1)
> OFPErrorMsg(type=0x5, code=0x0, data=b'\x04\x0e\x00\x50\xa5\
> x44\x0c\xcf\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
> x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
> x00\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
> x00\x00\x01\x00\x04\x00\x00\x00\x00\x00\x04\x00\x18\x00\x00\x00\x00')
>  |-- type: OFPET_FLOW_MOD_FAILED(5)
>  |-- code: OFPFMFC_UNKNOWN(0)
>  `-- data: version=0x4, msg_type=0xe, msg_len=0x50, xid=0xa5440ccf
>      `-- msg_type: OFPT_FLOW_MOD(14)
> 
> 
> 
> Modified Application Script is attached. I have printed out the values of
> the variables however I am not able to figure out whats going wrong when I
> am sending the* flow_mod. *
> 
> Can someone please suggest me how i can resolve this error ?
> 
> Thanks in advance.

> # 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 ryu.base import app_manager
> from ryu.controller import ofp_event
> from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
> from ryu.controller.handler import set_ev_cls
> from ryu.ofproto import ofproto_v1_3
> from ryu.lib.packet import packet
> from ryu.lib.packet import ethernet
> 
> 
> class ExampleSwitch13(app_manager.RyuApp):
>     OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
> 
>     def __init__(self, *args, **kwargs):
>         super(ExampleSwitch13, self).__init__(*args, **kwargs)
>         # initialize mac address table.
>         self.mac_to_port = {}
> 
>     @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
>     def switch_features_handler(self, ev):
>         datapath = ev.msg.datapath
>         ofproto = datapath.ofproto
>         parser = datapath.ofproto_parser
> 
> 	print
> 	print
> 	print "This is the port :  ", str(ofproto.OFPP_CONTROLLER)
>  	print "Buffer Id is : ", ofproto.OFPCML_NO_BUFFER	
> 	print
> 	print
> 
>         # install the table-miss flow entry.
>         match = parser.OFPMatch()
>         actions = [parser.OFPActionOutput(6633,
>                                           ofproto.OFPCML_NO_BUFFER)]
> 	
> 	print
> 	print "Actions : ", actions
> 	print
>         self.add_flow(datapath, 0, match, actions)
> 
>     def add_flow(self, datapath, priority, match, actions):
>         ofproto = datapath.ofproto
>         parser = datapath.ofproto_parser
> 
>         # construct flow_mod message and send it.
>         inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
>                                              actions)]
> 
> 	print
> 	print "Instructions : ", inst
> 	print
>         mod = parser.OFPFlowMod(datapath=datapath, table_id=0,priority=priority,
>                                 buffer_id=ofproto.OFPCML_NO_BUFFER, match=match, instructions=inst)
> 	print
> 	print "modification  : ", mod
>         print
> 	datapath.send_msg(mod)
> 
>     @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
>     def _packet_in_handler(self, ev):
>         msg = ev.msg
>         datapath = msg.datapath
>         ofproto = datapath.ofproto
>         parser = datapath.ofproto_parser
> 
>         # get Datapath ID to identify OpenFlow switches.
>         dpid = datapath.id
>         self.mac_to_port.setdefault(dpid, {})
> 
>         # analyse the received packets using the packet library.
>         pkt = packet.Packet(msg.data)
>         eth_pkt = pkt.get_protocol(ethernet.ethernet)
>         dst = eth_pkt.dst
>         src = eth_pkt.src
> 
>         # get the received port number from packet_in message.
>         in_port = msg.match['in_port']
> 
>         self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
> 
>         # learn a mac address to avoid FLOOD next time.
>         self.mac_to_port[dpid][src] = in_port
> 
>         # if the destination mac address is already learned,
>         # decide which port to output the packet, otherwise FLOOD.
>         if dst in self.mac_to_port[dpid]:
>             out_port = self.mac_to_port[dpid][dst]
>         else:
>             out_port = ofproto.OFPP_FLOOD
> 
>         # construct action list.
>         actions = [parser.OFPActionOutput(out_port)]
> 
>         # install a flow to avoid packet_in next time.
>         if out_port != ofproto.OFPP_FLOOD:
>             match = parser.OFPMatch(in_port=in_port, eth_dst=dst)
>             self.add_flow(datapath, 1, match, actions)
> 
>         # construct packet_out message and send it.
>         out = parser.OFPPacketOut(datapath=datapath,
>                                   buffer_id=ofproto.OFP_NO_BUFFER,
>                                   in_port=in_port, actions=actions,
>                                   data=msg.data)
>         datapath.send_msg(out)

> _______________________________________________
> discuss mailing list
> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss




More information about the discuss mailing list