Update Ironic VM network connection

When VM is dirrectly connected to OVS (current setup) there is no port
in OVS when VM is in powered off state. Since Ironic plug port to
network when VM is in powered-off state. Port should be present in OVS
even when VM is powered-off.

This patch adds additional network bridge called br-$VM_NAME for each
VM. Adds additional interface ovs-$VM_NAME which is added to both OVS
and br-$VM_NAME. And configures VM NIC in br-$VM_NAME instead of direct
connection to OVS switch.

Now connection looks like:

               Linux Bridge         OVS
 --------       -----------       ---------
 | vm-1 | <-->  | br-vm-1 | <---> | br-bm |
 --------       -----------       ---------

Change-Id: I317dd9429684a14d16ecf2887d45c2b014e36a84
Partial-bug: #1526403

devstack/lib/ironic

@@ -1306,6 +1306,12 @@ function cleanup_baremetal_basic_ops {
     local vm_name
     for vm_name in $(_ironic_bm_vm_names); do
         sudo su $STACK_USER -c "$IRONIC_SCRIPTS_DIR/cleanup-node.sh $vm_name"
+        # Cleanup node bridge/interfaces
+        sudo ip link set ovs-$vm_name down
+        sudo ip link set br-$vm_name down
+        sudo ovs-vsctl del-port ovs-$vm_name
+        sudo ip link del dev ovs-$vm_name
+        sudo ip link del dev br-$vm_name
     done
 
     sudo ovs-vsctl --if-exists del-br $IRONIC_VM_NETWORK_BRIDGE

devstack/tools/ironic/scripts/configure-vm.py

@@ -68,10 +68,11 @@ def main():
                         help="CPU count for the VM.")
     parser.add_argument('--bootdev', default='hd',
                         help="What boot device to use (hd/network).")
-    parser.add_argument('--network', default="brbm",
-                        help='The libvirt network name to use')
     parser.add_argument('--libvirt-nic-driver', default='virtio',
                         help='The libvirt network driver to use')
+    parser.add_argument('--bridge', default="br-seed",
+                        help='The linux bridge name to use for seeding \
+                                the baremetal pseudo-node\'s OS image')
     parser.add_argument('--console-log',
                         help='File to log console')
     parser.add_argument('--emulator', default=None,
@@ -89,7 +90,7 @@ def main():
         'memory': args.memory,
         'cpus': args.cpus,
         'bootdev': args.bootdev,
-        'network': args.network,
+        'bridge': args.bridge,
         'nicdriver': args.libvirt_nic_driver,
         'emulator': args.emulator,
         'disk_format': args.disk_format

devstack/tools/ironic/scripts/create-node.sh

@@ -62,6 +62,18 @@ else
 fi
 VOL_NAME="${NAME}.${DISK_FORMAT}"
 
+# Create bridge and add VM interface to it.
+# Additional interface will be added to this bridge and
+# it will be plugged to OVS.
+# This is needed in order to have interface in OVS even
+# when VM is in shutdown state
+
+sudo brctl addbr br-$NAME
+sudo ip link set br-$NAME up
+sudo ovs-vsctl add-port $BRIDGE ovs-$NAME -- set Interface ovs-$NAME type=internal
+sudo ip link set ovs-$NAME up
+sudo brctl addif br-$NAME ovs-$NAME
+
 if ! virsh list --all | grep -q $NAME; then
     virsh vol-list --pool $LIBVIRT_STORAGE_POOL | grep -q $VOL_NAME &&
         virsh vol-delete $VOL_NAME --pool $LIBVIRT_STORAGE_POOL >&2
@@ -73,7 +85,7 @@ if ! virsh list --all | grep -q $NAME; then
     $TOP_DIR/scripts/configure-vm.py \
         --bootdev network --name $NAME --image "$volume_path" \
         --arch $ARCH --cpus $CPU --memory $MEM --libvirt-nic-driver $LIBVIRT_NIC_DRIVER \
-        --emulator $EMULATOR --network $BRIDGE --disk-format $DISK_FORMAT $VM_LOGGING >&2
+        --emulator $EMULATOR --bridge br-$NAME --disk-format $DISK_FORMAT $VM_LOGGING >&2
 
     # Createa Virtual BMC for the node if IPMI is used
     if [[ $(type -P vbmc) != "" ]]; then

devstack/tools/ironic/templates/vm.xml

@@ -28,9 +28,8 @@
     <controller type='ide' index='0'>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
     </controller>
-    <interface type='network'>
-      <source network='%(network)s'/>
-      <virtualport type='openvswitch'/>
+    <interface type='bridge'>
+      <source bridge='%(bridge)s'/>
       <model type='%(nicdriver)s'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
     </interface>