Merge pull request #313 from cdburkard/master

ovs port numbering bug fix

examples/README.md

@@ -117,3 +117,8 @@ memory and `sysctl` configuration (see `INSTALL`.)
 
 This example creates a 64-host tree network, and attempts to check full
 connectivity using `ping`, for different switch/datapath types.
+
+#### numberedports.py
+
+This example verifies the mininet ofport numbers match up to the ovs port numbers.
+It also verifies that the port numbers match up to the interface numbers

examples/numberedports.py

+#!/usr/bin/python
+
+"""
+Create a network with 5 hosts, numbered 1-4 and 9. 
+Validate that the port numbers match to the interface name,
+and that the ovs ports match the mininet ports.
+"""
+
+from mininet.net import Mininet
+from mininet.node import Controller
+from mininet.log import setLogLevel, info, warn
+from mininet.node import Node
+
+def validatePort( switch, intf ):
+    "Validate intf's OF port number"
+    ofport = int( switch.cmd( 'ovs-vsctl get Interface', intf,
+                          'ofport' ) )
+    if ofport != switch.ports[ intf ]:
+        warn( 'WARNING: ofport for', intf, 'is actually', ofport, '\n' )
+        return 0
+    else:
+        return 1
+
+def net():
+
+    "Create a network with 5 hosts."
+
+    net = Mininet( controller=Controller )
+
+    info( '*** Adding controller\n' )
+    net.addController( 'c0' )
+
+    info( '*** Adding hosts\n' )
+    h1 = net.addHost( 'h1', ip='10.0.0.1' )
+    h2 = net.addHost( 'h2', ip='10.0.0.2' )
+    h3 = net.addHost( 'h3', ip='10.0.0.3' )
+    h4 = net.addHost( 'h4', ip='10.0.0.4' )
+    h5 = net.addHost( 'h5', ip='10.0.0.5' )
+
+    info( '*** Adding switch\n' )
+    s1 = net.addSwitch( 's1' )
+
+    info( '*** Creating links\n' )
+    # host 1-4 connect to ports 1-4 on the switch
+    net.addLink( h1, s1 )
+    net.addLink( h2, s1 )
+    net.addLink( h3, s1 )
+    net.addLink( h4, s1 )
+    net.addLink( h5, s1, port1 = 1, port2 = 9 ) # specify a different port to connect host 5 to on the switch.
+
+    root = Node( 'root', inNamespace=False )
+    info( '*** Starting network\n' )
+    net.start()
+
+    # print the interfaces and their port numbers
+    info( '\n*** printing and validating the ports running on each interface\n' )
+    for intfs in s1.intfList():
+        if not intfs.name == "lo":
+            info( intfs, ': ', s1.ports[intfs], 
+            '\n' )
+            info ( 'Validating that', intfs, 'is actually on port', s1.ports[intfs], '... ' )
+            if validatePort( s1, intfs ):
+                info( 'Validated.\n' )
+    print '\n'
+        
+    # test the network with pingall
+    net.pingAll()
+    print '\n'
+
+    info( '*** Stopping network' )
+    net.stop()
+
+if __name__ == '__main__':
+    setLogLevel( 'info' )
+    net()
+

examples/test/test_numberedports.py

+#!/usr/bin/env python
+
+"""
+Test for numberedports.py
+"""
+
+import unittest
+import pexpect
+from collections import defaultdict
+from mininet.node import OVSSwitch
+
+class testNumberedports( unittest.TestCase ):
+
+    @unittest.skipIf( OVSSwitch.setup() or OVSSwitch.isOldOVS(), "old version of OVS" )
+    def testConsistency( self ):
+        """verify consistency between mininet and ovs ports"""
+        p = pexpect.spawn( 'python -m mininet.examples.numberedports' )
+        opts = [ 'Validating that s1-eth\d is actually on port \d ... Validated.', 
+                 'Validating that s1-eth\d is actually on port \d ... WARNING', 
+                 pexpect.EOF ]
+        correct_ports = True
+        count = 0
+        while True:
+            index = p.expect( opts )
+            if index == 0:
+                count += 1
+            elif index == 1:
+                correct_ports = False
+            elif index == 2:
+                self.assertNotEqual( 0, count )
+                break
+        self.assertTrue( correct_ports )
+
+    def testNumbering( self ):
+        """verify that all of the port numbers are printed correctly and consistent with their interface"""
+        p = pexpect.spawn( 'python -m mininet.examples.numberedports' )
+        opts = [ 's1-eth(\d+) :  (\d+)', 
+                 pexpect.EOF ]
+        count_intfs = 0
+        while True:
+            index = p.expect( opts )
+            if index == 0:
+                count_intfs += 1
+                intfport = p.match.group( 1 )
+                ofport = p.match.group( 2 )
+                self.assertEqual( intfport, ofport )
+            elif index == 1:
+                break
+                self.assertNotEqual( 0, count_intfs )
+
+if __name__ == '__main__':
+    unittest.main()

mininet/node.py

@@ -57,6 +57,8 @@
                            numCores, retry, mountCgroups )
 from mininet.moduledeps import moduleDeps, pathCheck, OVS_KMOD, OF_KMOD, TUN
 from mininet.link import Link, Intf, TCIntf
+from re import findall
+from distutils.version import StrictVersion
 
 class Node( object ):
     """A virtual network node is simply a shell in a network namespace.
@@ -987,6 +989,13 @@ def setup( cls ):
                    'You may wish to try '
                    '"service openvswitch-switch start".\n' )
             exit( 1 )
+        info = quietRun( 'ovs-vsctl --version' )
+        cls.OVSVersion =  findall( '\d+\.\d+', info )[ 0 ]
+
+    @classmethod
+    def isOldOVS( cls ):
+        return ( StrictVersion( cls.OVSVersion ) <
+             StrictVersion( '1.10' ) )
 
     @classmethod
     def batchShutdown( cls, switches ):
@@ -1046,19 +1055,32 @@ def start( self, controllers ):
         self.cmd( 'ovs-vsctl del-br', self )
         int( self.dpid, 16 ) # DPID must be a hex string
         # Interfaces and controllers
-        intfs = ' '.join( '-- add-port %s %s ' % ( self, intf )
+        intfs = ' '.join( '-- add-port %s %s ' % ( self, intf ) +
+                          '-- set Interface %s ' % intf +
+                          'ofport_request=%s ' % self.ports[ intf ]
                          for intf in self.intfList() if not intf.IP() )
         clist = ' '.join( '%s:%s:%d' % ( c.protocol, c.IP(), c.port )
                          for c in controllers )
         if self.listenPort:
             clist += ' ptcp:%s' % self.listenPort
-        # Construct big ovs-vsctl command
-        cmd = ( 'ovs-vsctl add-br %s ' % self +
-                '-- set Bridge %s ' % self +
+        # Construct big ovs-vsctl command for new versions of OVS
+        if not self.isOldOVS():
+            cmd = ( 'ovs-vsctl add-br %s ' % self +
+                    '-- set Bridge %s ' % self +
+                    'other_config:datapath-id=%s ' % self.dpid +
+                    '-- set-fail-mode %s %s ' % ( self, self.failMode ) +
+                    intfs +
+                    '-- set-controller %s %s ' % ( self, clist ) )
+        # Construct ovs-vsctl commands for old versions of OVS
+        else:
+            self.cmd( 'ovs-vsctl add-br', self )
+            for intf in self.intfList():
+                if not intf.IP():
+                    self.cmd('ovs-vsctl add-port', self, intf )
+            cmd = ('ovs-vsctl set Bridge %s ' % self +
                 'other_config:datapath-id=%s ' % self.dpid +
                 '-- set-fail-mode %s %s ' % ( self, self.failMode ) +
-                intfs +
-                '-- set-controller %s %s ' % (self, clist ) )
+                '-- set-controller %s %s ' % ( self, clist ) )
         if not self.inband:
             cmd += ( '-- set bridge %s '
                      'other-config:disable-in-band=true ' % self )
@@ -1282,4 +1304,3 @@ def checkListening( self ):
         if 'Connected' not in listening:
             warn( "Unable to contact the remote controller"
                   " at %s:%d\n" % ( self.ip, self.port ) )
-