/
infiniband_physical.go
248 lines (206 loc) · 6.67 KB
/
infiniband_physical.go
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package device
import (
"fmt"
"strconv"
deviceConfig "github.com/lxc/lxd/lxd/device/config"
pcidev "github.com/lxc/lxd/lxd/device/pci"
"github.com/lxc/lxd/lxd/instance"
"github.com/lxc/lxd/lxd/instance/instancetype"
"github.com/lxc/lxd/lxd/ip"
"github.com/lxc/lxd/lxd/resources"
"github.com/lxc/lxd/lxd/util"
"github.com/lxc/lxd/shared"
)
type infinibandPhysical struct {
deviceCommon
}
// validateConfig checks the supplied config for correctness.
func (d *infinibandPhysical) validateConfig(instConf instance.ConfigReader) error {
requiredFields := []string{"parent"}
optionalFields := []string{
"name",
"mtu",
"hwaddr",
}
rules := nicValidationRules(requiredFields, optionalFields, instConf)
rules["hwaddr"] = func(value string) error {
if value == "" {
return nil
}
return infinibandValidMAC(value)
}
err := d.config.Validate(rules)
if err != nil {
return err
}
return nil
}
// validateEnvironment checks the runtime environment for correctness.
func (d *infinibandPhysical) 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 *infinibandPhysical) Start() (*deviceConfig.RunConfig, error) {
err := d.validateEnvironment()
if err != nil {
return nil, err
}
saveData := make(map[string]string)
// pciIOMMUGroup, used for VM physical passthrough.
var pciIOMMUGroup uint64
// 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, fmt.Errorf("Error loading %q module: %w", "vfio-pci", err)
}
}
runConf := deviceConfig.RunConfig{}
// Load network interface info.
nics, err := resources.GetNetwork()
if err != nil {
return nil, err
}
// Filter the network interfaces to just infiniband devices related to parent.
ibDevs := infinibandDevices(nics, d.config["parent"])
ibDev, found := ibDevs[d.config["parent"]]
if !found {
return nil, fmt.Errorf("Specified infiniband device \"%s\" not found", d.config["parent"])
}
saveData["host_name"] = ibDev.ID
if d.inst.Type() == instancetype.Container {
// Record hwaddr and mtu before potentially modifying them.
err = networkSnapshotPhysicalNIC(saveData["host_name"], saveData)
if err != nil {
return nil, err
}
// Set the MAC address.
if d.config["hwaddr"] != "" {
err := infinibandSetDevMAC(saveData["host_name"], 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"] != "" {
mtu, err := strconv.ParseUint(d.config["mtu"], 10, 32)
if err != nil {
return nil, fmt.Errorf("Invalid MTU specified %q: %w", d.config["mtu"], err)
}
link := &ip.Link{Name: saveData["host_name"]}
err = link.SetMTU(uint32(mtu))
if err != nil {
return nil, fmt.Errorf("Failed setting MTU %q on %q: %w", d.config["mtu"], saveData["host_name"], err)
}
}
// Configure runConf with infiniband setup instructions.
err = infinibandAddDevices(d.state, d.inst.DevicesPath(), d.name, ibDev, &runConf)
if err != nil {
return nil, 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 := pcidev.ParseUeventFile(ueventPath)
if err != nil {
return nil, fmt.Errorf("Failed to get PCI device info for %q: %w", saveData["host_name"], err)
}
saveData["last_state.pci.slot.name"] = pciDev.SlotName
saveData["last_state.pci.driver"] = pciDev.Driver
err = pcidev.DeviceDriverOverride(pciDev, "vfio-pci")
if err != nil {
return nil, err
}
pciIOMMUGroup, err = pcidev.DeviceIOMMUGroup(saveData["last_state.pci.slot.name"])
if err != nil {
return nil, err
}
// Record original driver used by device for restore.
saveData["last_state.pci.driver"] = pciDev.Driver
}
err = d.volatileSet(saveData)
if err != nil {
return nil, err
}
runConf.NetworkInterface = []deviceConfig.RunConfigItem{
{Key: "type", Value: "phys"},
{Key: "name", Value: d.config["name"]},
{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: saveData["last_state.pci.slot.name"]},
{Key: "pciIOMMUGroup", Value: fmt.Sprintf("%d", pciIOMMUGroup)},
}...)
}
return &runConf, nil
}
// Stop is run when the device is removed from the instance.
func (d *infinibandPhysical) Stop() (*deviceConfig.RunConfig, error) {
v := d.volatileGet()
runConf := deviceConfig.RunConfig{
PostHooks: []func() error{d.postStop},
NetworkInterface: []deviceConfig.RunConfigItem{
{Key: "link", Value: v["host_name"]},
},
}
if d.inst.Type() == instancetype.Container {
err := unixDeviceRemove(d.inst.DevicesPath(), IBDevPrefix, d.name, "", &runConf)
if err != nil {
return nil, err
}
}
return &runConf, nil
}
// postStop is run after the device is removed from the instance.
func (d *infinibandPhysical) postStop() error {
defer func() {
_ = d.volatileSet(map[string]string{
"host_name": "",
"last_state.hwaddr": "",
"last_state.mtu": "",
"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 := pcidev.Device{
Driver: "vfio-pci",
SlotName: v["last_state.pci.slot.name"],
}
// Unbind device from the host so that the restored settings will take effect when we rebind it.
err := pcidev.DeviceUnbind(vfioDev)
if err != nil {
return err
}
err = pcidev.DeviceDriverOverride(vfioDev, v["last_state.pci.driver"])
if err != nil {
return err
}
} else if d.inst.Type() == instancetype.Container {
// Remove infiniband host files for this device.
err := unixDeviceDeleteFiles(d.state, d.inst.DevicesPath(), IBDevPrefix, d.name, "")
if err != nil {
return fmt.Errorf("Failed to delete files for device '%s': %w", d.name, err)
}
}
// Restore hwaddr and mtu.
if v["host_name"] != "" {
err := networkRestorePhysicalNIC(v["host_name"], v)
if err != nil {
return err
}
}
return nil
}