/
nic_physical.go
259 lines (212 loc) · 7.04 KB
/
nic_physical.go
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package device
import (
"fmt"
"github.com/pkg/errors"
deviceConfig "github.com/lxc/lxd/lxd/device/config"
"github.com/lxc/lxd/lxd/instance"
"github.com/lxc/lxd/lxd/instance/instancetype"
"github.com/lxc/lxd/lxd/network"
"github.com/lxc/lxd/lxd/revert"
"github.com/lxc/lxd/lxd/util"
"github.com/lxc/lxd/shared"
)
type nicPhysical struct {
deviceCommon
}
// validateConfig checks the supplied config for correctness.
func (d *nicPhysical) validateConfig(instConf instance.ConfigReader) error {
if !instanceSupported(instConf.Type(), instancetype.Container, instancetype.VM) {
return ErrUnsupportedDevType
}
requiredFields := []string{"parent"}
optionalFields := []string{
"name",
"maas.subnet.ipv4",
"maas.subnet.ipv6",
"boot.priority",
}
if instConf.Type() == instancetype.Container {
optionalFields = append(optionalFields, "mtu", "hwaddr", "vlan")
}
err := d.config.Validate(nicValidationRules(requiredFields, optionalFields))
if err != nil {
return err
}
return nil
}
// validateEnvironment checks the runtime environment for correctness.
func (d *nicPhysical) validateEnvironment() error {
if d.inst.Type() == instancetype.Container && d.config["name"] == "" {
return fmt.Errorf("Requires name property to start")
}
if !shared.PathExists(fmt.Sprintf("/sys/class/net/%s", d.config["parent"])) {
return fmt.Errorf("Parent device '%s' doesn't exist", d.config["parent"])
}
return nil
}
// Start is run when the device is added to a running instance or instance is starting up.
func (d *nicPhysical) Start() (*deviceConfig.RunConfig, error) {
err := d.validateEnvironment()
if err != nil {
return nil, err
}
// Lock to avoid issues with containers starting in parallel.
networkCreateSharedDeviceLock.Lock()
defer networkCreateSharedDeviceLock.Unlock()
saveData := make(map[string]string)
revert := revert.New()
defer revert.Fail()
// pciSlotName, used for VM physical passthrough.
var pciSlotName string
// If VM, then try and load the vfio-pci module first.
if d.inst.Type() == instancetype.VM {
err = util.LoadModule("vfio-pci")
if err != nil {
return nil, errors.Wrapf(err, "Error loading %q module", "vfio-pci")
}
}
// Record the host_name device used for restoration later.
saveData["host_name"] = network.GetHostDevice(d.config["parent"], d.config["vlan"])
if d.inst.Type() == instancetype.Container {
statusDev, err := networkCreateVlanDeviceIfNeeded(d.state, d.config["parent"], saveData["host_name"], d.config["vlan"])
if err != nil {
return nil, err
}
// Record whether we created this device or not so it can be removed on stop.
saveData["last_state.created"] = fmt.Sprintf("%t", statusDev != "existing")
if shared.IsTrue(saveData["last_state.created"]) {
revert.Add(func() {
networkRemoveInterfaceIfNeeded(d.state, saveData["host_name"], d.inst, d.config["parent"], d.config["vlan"])
})
}
// If we didn't create the device we should track various properties so we can restore them when the
// instance is stopped or the device is detached.
if !shared.IsTrue(saveData["last_state.created"]) {
err = networkSnapshotPhysicalNic(saveData["host_name"], saveData)
if err != nil {
return nil, err
}
}
// Set the MAC address.
if d.config["hwaddr"] != "" {
_, err := shared.RunCommand("ip", "link", "set", "dev", saveData["host_name"], "address", d.config["hwaddr"])
if err != nil {
return nil, fmt.Errorf("Failed to set the MAC address: %s", err)
}
}
// Set the MTU.
if d.config["mtu"] != "" {
_, err := shared.RunCommand("ip", "link", "set", "dev", saveData["host_name"], "mtu", d.config["mtu"])
if err != nil {
return nil, fmt.Errorf("Failed to set the MTU: %s", err)
}
}
} else if d.inst.Type() == instancetype.VM {
// Get PCI information about the network interface.
ueventPath := fmt.Sprintf("/sys/class/net/%s/device/uevent", saveData["host_name"])
pciDev, err := networkGetDevicePCIDevice(ueventPath)
if err != nil {
return nil, errors.Wrapf(err, "Failed to get PCI device info for %q", saveData["host_name"])
}
saveData["last_state.pci.slot.name"] = pciDev.SlotName
saveData["last_state.pci.driver"] = pciDev.Driver
// Unbind the interface from the host.
err = networkDeviceUnbind(pciDev)
if err != nil {
return nil, err
}
revert.Add(func() { networkDeviceBind(pciDev) })
// Register the device with the vfio-pci module.
err = networkVFIOPCIRegister(pciDev)
if err != nil {
return nil, err
}
vfioDev := pciDevice{
Driver: "vfio-pci",
SlotName: pciDev.SlotName,
}
revert.Add(func() { networkDeviceUnbind(vfioDev) })
err = networkDeviceBindWait(vfioDev)
if err != nil {
return nil, err
}
pciSlotName = saveData["last_state.pci.slot.name"]
}
err = d.volatileSet(saveData)
if err != nil {
return nil, err
}
runConf := deviceConfig.RunConfig{}
runConf.NetworkInterface = []deviceConfig.RunConfigItem{
{Key: "name", Value: d.config["name"]},
{Key: "type", Value: "phys"},
{Key: "flags", Value: "up"},
{Key: "link", Value: saveData["host_name"]},
}
if d.inst.Type() == instancetype.VM {
runConf.NetworkInterface = append(runConf.NetworkInterface,
[]deviceConfig.RunConfigItem{
{Key: "devName", Value: d.name},
{Key: "pciSlotName", Value: pciSlotName},
}...)
}
revert.Success()
return &runConf, nil
}
// Stop is run when the device is removed from the instance.
func (d *nicPhysical) Stop() (*deviceConfig.RunConfig, error) {
v := d.volatileGet()
runConf := deviceConfig.RunConfig{
PostHooks: []func() error{d.postStop},
NetworkInterface: []deviceConfig.RunConfigItem{
{Key: "link", Value: v["host_name"]},
},
}
return &runConf, nil
}
// postStop is run after the device is removed from the instance.
func (d *nicPhysical) postStop() error {
defer d.volatileSet(map[string]string{
"host_name": "",
"last_state.hwaddr": "",
"last_state.mtu": "",
"last_state.created": "",
"last_state.pci.slot.name": "",
"last_state.pci.driver": "",
})
v := d.volatileGet()
// If VM physical pass through, unbind from vfio-pci and bind back to host driver.
if d.inst.Type() == instancetype.VM && v["last_state.pci.slot.name"] != "" {
vfioDev := pciDevice{
Driver: "vfio-pci",
SlotName: v["last_state.pci.slot.name"],
}
err := networkDeviceUnbind(vfioDev)
if err != nil {
return err
}
hostDev := pciDevice{
Driver: v["last_state.pci.driver"],
SlotName: v["last_state.pci.slot.name"],
}
err = networkDeviceBind(hostDev)
if err != nil {
return err
}
} else if d.inst.Type() == instancetype.Container {
hostName := network.GetHostDevice(d.config["parent"], d.config["vlan"])
// This will delete the parent interface if we created it for VLAN parent.
if shared.IsTrue(v["last_state.created"]) {
err := networkRemoveInterfaceIfNeeded(d.state, hostName, d.inst, d.config["parent"], d.config["vlan"])
if err != nil {
return err
}
} else if v["last_state.pci.slot.name"] == "" {
err := networkRestorePhysicalNic(hostName, v)
if err != nil {
return err
}
}
}
return nil
}