3 # Script to retrieve extended information about VIFs that are
4 # needed by the controller. This is called by the "vif" script,
5 # which is run when virtual interfaces are added and removed.
7 # Copyright (C) 2009 Nicira Networks, Inc.
9 # Copying and distribution of this file, with or without modification,
10 # are permitted in any medium without royalty provided the copyright
11 # notice and this notice are preserved. This file is offered as-is,
12 # without warranty of any kind.
16 import xen.lowlevel.xs
18 # Query XenStore for the opaque reference of this vif
19 def get_vif_ref(domid, devid):
20 xenstore = xen.lowlevel.xs.xs()
21 t = xenstore.transaction_start()
22 vif_ref = xenstore.read(t, '/xapi/%s/private/vif/%s/ref' % (domid, devid))
23 xenstore.transaction_end(t)
26 # Query XAPI for the information we need using the vif's opaque reference
27 def dump_vif_info(domid, devid, vif_ref):
29 session = XenAPI.xapi_local()
30 session.xenapi.login_with_password("root", "")
32 vif_rec = session.xenapi.VIF.get_record(vif_ref)
33 net_rec = session.xenapi.network.get_record(vif_rec["network"])
34 vm_uuid = session.xenapi.VM.get_uuid(vif_rec["VM"])
36 # Data to allow vNetManager to associate VIFs with xapi data
37 add_port = '--add=port.vif%s.%s' % (domid, devid)
38 vif_info.append('%s.net-uuid=%s' % (add_port, net_rec["uuid"]))
39 vif_info.append('%s.vif-mac=%s' % (add_port, vif_rec["MAC"]))
40 vif_info.append('%s.vif-uuid=%s' % (add_port, vif_rec["uuid"]))
41 vif_info.append('%s.vm-uuid=%s' % (add_port, vm_uuid))
43 # vNetManager needs to know the network UUID(s) associated with
44 # each datapath. Normally interface-reconfigure adds them, but
45 # interface-reconfigure never gets called for internal networks
46 # (xapi does the addbr ioctl internally), so we have to do it
47 # here instead for internal networks. This is only acceptable
48 # because xapi is lazy about creating internal networks: it
49 # only creates one just before it adds the first vif to it.
50 # There may still be a brief delay between the initial
51 # ovs-vswitchd connection to vNetManager and setting this
52 # configuration variable, but vNetManager can tolerate that.
53 if not net_rec['PIFs']:
54 key = 'bridge.%s.xs-network-uuids' % net_rec['bridge']
55 value = net_rec['uuid']
56 vif_info.append('--del-match=%s=*' % key)
57 vif_info.append('--add=%s=%s' % (key, value))
59 session.xenapi.session.logout()
60 print ' '.join(vif_info)
62 if __name__ == '__main__':
63 if len(sys.argv) != 3:
64 sys.stderr.write("ERROR: %s <domid> <devid>\n" % sys.argv[0])
70 vif_ref = get_vif_ref(domid, devid)
72 sys.stderr.write("ERROR: Could not find interface vif%s.%s\n"
76 dump_vif_info(domid, devid, vif_ref)