network: Wait for network device in UpdateInterface

A new field PciAddr has been added to grpc.Interface. This is the PCI identifier of the network device. In order to support network hotplug, we need to wait for the device to be online first based on the PCI address of the device inside the VM before updating its configuration. Fixes #305 Signed-off-by: Archana Shinde <[email protected]>
kata-containers · Aug 28, 2018 · 5e36bfc · 5e36bfc
1 parent 218ce89
commit 5e36bfc
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Showing 3 changed files with 213 additions and 147 deletions.
diff --git a/network.go b/network.go
@@ -239,8 +239,19 @@ func (s *sandbox) updateInterface(netHandle *netlink.Handle, iface *pb.Interface
 	fieldLogger := agentLog.WithFields(logrus.Fields{
 		"mac-address":    iface.HwAddr,
 		"interface-name": iface.Device,
+		"pci-address":    iface.PciAddr,
 	})
 
+	// If the PCI address of the network device is provided, wait/check for the device
+	// to be available first
+	if iface.PciAddr != "" {
+		// iface.PciAddr is in the format bridgeAddr/deviceAddr eg. 05/06
+		_, err := getPCIDeviceName(s, iface.PciAddr)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	var link netlink.Link
 	if iface.HwAddr != "" {
 		fieldLogger.Info("Getting interface from MAC address")