Import KVM VM: Autodetect vlan id from bridge name (#11507)

* Get vlan from bridge name while importing kvm instances

* Fix LibvirtReplugNicCommandWrapperTest

* Cleanup MultiNetworkSelection.vue

* getting the vlanid from the /proc/net/vlan/<pif> file instead of the bridge name

* Update plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtGetUnmanagedInstancesCommandWrapper.java

Co-authored-by: dahn <daan.hoogland@gmail.com>

* Don't call sendValuesTimed from getDefaultNetwork as it's causing an infinte loop

* set default network values in setDefaultValues instead of getDefaultNetwork

---------

Co-authored-by: Wei Zhou <weizhou@apache.org>
Co-authored-by: dahn <daan.hoogland@gmail.com>

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java

@@ -1797,6 +1797,20 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
         return "";
     }
 
+    public Integer getVlanIdForBridge(final String bridge) {
+        String pif = matchPifFileInDirectory(bridge);
+        final File vlanfile = new File("/proc/net/vlan/" + pif);
+        if (vlanfile.isFile()) {
+            String vlan = Script.runSimpleBashScript("awk '/VID:/ {print $3}' /proc/net/vlan/" + pif);
+            try {
+                return Integer.parseInt(vlan);
+            } catch (final NumberFormatException e) {
+                return null;
+            }
+        }
+        return null;
+    }
+
     static String [] ifNamePatterns = {
             "^eth",
             "^bond",

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtGetUnmanagedInstancesCommandWrapper.java

@@ -132,7 +132,7 @@ public final class LibvirtGetUnmanagedInstancesCommandWrapper extends CommandWra
             }
             instance.setPowerState(getPowerState(libvirtComputingResource.getVmState(conn,domain.getName())));
             instance.setMemory((int) LibvirtComputingResource.getDomainMemory(domain) / 1024);
-            instance.setNics(getUnmanagedInstanceNics(parser.getInterfaces()));
+            instance.setNics(getUnmanagedInstanceNics(libvirtComputingResource, parser.getInterfaces()));
             instance.setDisks(getUnmanagedInstanceDisks(parser.getDisks(),libvirtComputingResource, conn, domain.getName()));
             instance.setVncPassword(getFormattedVncPassword(parser.getVncPasswd()));
             if (parser.getBootType() != null) {
@@ -169,7 +169,7 @@ public final class LibvirtGetUnmanagedInstancesCommandWrapper extends CommandWra
         }
     }
 
-    private List<UnmanagedInstanceTO.Nic> getUnmanagedInstanceNics(List<LibvirtVMDef.InterfaceDef> interfaces) {
+    private List<UnmanagedInstanceTO.Nic> getUnmanagedInstanceNics(LibvirtComputingResource libvirtComputingResource, List<LibvirtVMDef.InterfaceDef> interfaces) {
         final ArrayList<UnmanagedInstanceTO.Nic> nics = new ArrayList<>(interfaces.size());
         int counter = 0;
         for (LibvirtVMDef.InterfaceDef interfaceDef : interfaces) {
@@ -180,6 +180,10 @@ public final class LibvirtGetUnmanagedInstancesCommandWrapper extends CommandWra
             nic.setNetwork(interfaceDef.getDevName());
             nic.setPciSlot(interfaceDef.getSlot().toString());
             nic.setVlan(interfaceDef.getVlanTag());
+            if (nic.getVlan() == -1
+                && LibvirtVMDef.InterfaceDef.GuestNetType.BRIDGE.equals(interfaceDef.getNetType())) {
+                nic.setVlan(libvirtComputingResource.getVlanIdForBridge(interfaceDef.getBrName()));
+            }
             nics.add(nic);
         }
         return nics;

ui/src/views/compute/wizard/MultiNetworkSelection.vue

@@ -47,7 +47,7 @@
           <a-select
             style="width: 100%"
             v-if="validNetworks[record.id] && validNetworks[record.id].length > 0"
-            :defaultValue="validNetworks[record.id][0].id"
+            :defaultValue="getDefaultNetwork(record)"
             @change="val => handleNetworkChange(record, val)"
             showSearch
             optionFilterProp="label"
@@ -265,7 +265,16 @@ export default {
       this.values = {}
       this.ipAddresses = {}
       for (const item of this.items) {
-        var network = this.validNetworks[item.id]?.[0] || null
+        let network = null
+        if (item.vlanid && item.vlanid !== -1) {
+          const matched = this.validNetworks[item.id].filter(x => Number(x.vlan) === item.vlanid)
+          if (matched.length > 0) {
+            network = matched[0]
+          }
+        }
+        if (!network) {
+          network = this.validNetworks[item.id]?.[0] || null
+        }
         this.values[item.id] = network ? network.id : ''
         this.ipAddresses[item.id] = (!network || network.type === 'L2') ? null : 'auto'
         this.setIpAddressEnabled(item, network)
@@ -280,6 +289,9 @@ export default {
       }
       this.sendValuesTimed()
     },
+    getDefaultNetwork (record) {
+      return this.values[record.id] || this.validNetworks[record.id]?.[0]?.id
+    },
     sendValuesTimed () {
       clearTimeout(this.sendValuesTimer)
       this.sendValuesTimer = setTimeout(() => {