Hi
When I run my modified version of simple_switch.py I get the following
output.
loading app ryu/app/simple_switch.py
loading app ryu.topology.switches
loading app ryu.controller.ofp_handler
loading app ryu.controller.ofp_handler
instantiating app ryu.topology.switches of Switches
instantiating app ryu.controller.ofp_handler of OFPHandler
instantiating app ryu/app/simple_switch.py of SimpleSwitch
switch Switch<dpid=516, Port<dpid=516, port_no=1, LIVE> Port<dpid=516,
port_no=2, LIVE> >
switch Switch<dpid=514, Port<dpid=514, port_no=1, LIVE> Port<dpid=514,
port_no=2, LIVE> >
switch Switch<dpid=513, Port<dpid=513, port_no=1, LIVE> Port<dpid=513,
port_no=2, LIVE> >
switch Switch<dpid=517, Port<dpid=517, port_no=1, LIVE> Port<dpid=517,
port_no=2, LIVE> >
switch Switch<dpid=515, Port<dpid=515, port_no=1, LIVE> Port<dpid=515,
port_no=2, LIVE> >
switch Switch<dpid=518, Port<dpid=518, port_no=1, LIVE> Port<dpid=518,
port_no=2, LIVE> >
Now my modified simple_switch application is given below.
import logging
import struct
from ryu.base import app_manager
from ryu.controller import mac_to_port
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import CONFIG_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_0
from ryu.lib.mac import haddr_to_bin
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from bulbs.titan import Graph
import ryu.topology.api
from ryu.lib import stplib
from ryu.lib import dpid as dpid_lib
class _SwitchInfo(object):
def __init__(self, datapath):
self.datapath = datapath
self.xids = {}
self.barriers = {}
self.results = {}
class SimpleSwitch(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch, self).__init__(*args, **kwargs)
self.mac_to_port = {}
self.do_once = 0
self.switches = {}
def add_flow(self, datapath, in_port, dst, actions):
ofproto = datapath.ofproto
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port, dl_dst=haddr_to_bin(dst))
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0,
command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
priority=ofproto.OFP_DEFAULT_PRIORITY,
flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
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
pkt = packet.Packet(msg.data)
eth = pkt.get_protocol(ethernet.ethernet)
dst = eth.dst
src = eth.src
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
#self.logger.info("packet in %s %s %s %s", dpid, src, dst,
msg.in_port)
# learn a mac address to avoid FLOOD next time.
self.mac_to_port[dpid][src] = msg.in_port
if dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][dst]
else:
out_port = ofproto.OFPP_FLOOD
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
self.add_flow(datapath, msg.in_port, dst, actions)
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
actions=actions)
datapath.send_msg(out)
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def _port_status_handler(self, ev):
msg = ev.msg
reason = msg.reason
port_no = msg.desc.port_no
ofproto = msg.datapath.ofproto
if reason == ofproto.OFPPR_ADD:
self.logger.info("port added %s", port_no)
pass
elif reason == ofproto.OFPPR_DELETE:
self.logger.info("port deleted %s", port_no)
pass
elif reason == ofproto.OFPPR_MODIFY:
self.logger.info("port modified %s", port_no)
pass
else:
self.logger.info("Illeagal port state %s %s", port_no, reason)
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def _switch_features_handler(self, ev):
datapath = ev.msg.datapath
id = datapath.id
assert isinstance(id, (int, long))
old_info = self.switches.get(id, None)
new_info = _SwitchInfo(datapath=datapath)
self.logger.debug('add dpid %s datapath %s new_info %s old_info %s'
%
(id, datapath, new_info, old_info))
self.switches[id] = new_info
@set_ev_cls(stplib.EventPortStateChange, MAIN_DISPATCHER)
def _port_state_change_handler(self, ev):
dpid_str = dpid_lib.dpid_to_str(ev.dp.id)
of_state = {stplib.PORT_STATE_DISABLE: 'DISABLE',
stplib.PORT_STATE_BLOCK: 'BLOCK',
stplib.PORT_STATE_LISTEN: 'LISTEN',
stplib.PORT_STATE_LEARN: 'LEARN',
stplib.PORT_STATE_FORWARD: 'FORWARD'}
self.logger.debug("***[dpid=%s][port=%d] state=%s",
dpid_str, ev.port_no, of_state[ev.port_state])
My question is what part of the code is prompting the the messages given
above.(switch Switch<dpid=516, Port<dpid=516, port_no=1, LIVE>
Port<dpid=516, port_no=2, LIVE> >)
I think I have found out the code for it
https://github.com/karthik82/ryu/blob/master/ryu/topology/switches.py#L100
But I can't seem to understand the control flow.
Any help would be greatly appreciated.
Regards,
Karthik.
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