273 lines
7.2 KiB
Go
273 lines
7.2 KiB
Go
package netlink
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import (
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"syscall"
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"fmt"
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"github.com/vishvananda/netlink/nl"
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"golang.org/x/sys/unix"
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)
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// DevlinkDevEswitchAttr represents device's eswitch attributes
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type DevlinkDevEswitchAttr struct {
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Mode string
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InlineMode string
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EncapMode string
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}
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// DevlinkDevAttrs represents device attributes
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type DevlinkDevAttrs struct {
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Eswitch DevlinkDevEswitchAttr
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}
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// DevlinkDevice represents device and its attributes
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type DevlinkDevice struct {
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BusName string
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DeviceName string
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Attrs DevlinkDevAttrs
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}
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func parseDevLinkDeviceList(msgs [][]byte) ([]*DevlinkDevice, error) {
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devices := make([]*DevlinkDevice, 0, len(msgs))
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for _, m := range msgs {
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attrs, err := nl.ParseRouteAttr(m[nl.SizeofGenlmsg:])
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if err != nil {
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return nil, err
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}
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dev := &DevlinkDevice{}
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if err = dev.parseAttributes(attrs); err != nil {
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return nil, err
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}
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devices = append(devices, dev)
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}
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return devices, nil
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}
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func eswitchStringToMode(modeName string) (uint16, error) {
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if modeName == "legacy" {
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return nl.DEVLINK_ESWITCH_MODE_LEGACY, nil
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} else if modeName == "switchdev" {
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return nl.DEVLINK_ESWITCH_MODE_SWITCHDEV, nil
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} else {
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return 0xffff, fmt.Errorf("invalid switchdev mode")
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}
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}
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func parseEswitchMode(mode uint16) string {
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var eswitchMode = map[uint16]string{
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nl.DEVLINK_ESWITCH_MODE_LEGACY: "legacy",
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nl.DEVLINK_ESWITCH_MODE_SWITCHDEV: "switchdev",
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}
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if eswitchMode[mode] == "" {
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return "unknown"
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} else {
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return eswitchMode[mode]
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}
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}
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func parseEswitchInlineMode(inlinemode uint8) string {
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var eswitchInlineMode = map[uint8]string{
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nl.DEVLINK_ESWITCH_INLINE_MODE_NONE: "none",
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nl.DEVLINK_ESWITCH_INLINE_MODE_LINK: "link",
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nl.DEVLINK_ESWITCH_INLINE_MODE_NETWORK: "network",
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nl.DEVLINK_ESWITCH_INLINE_MODE_TRANSPORT: "transport",
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}
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if eswitchInlineMode[inlinemode] == "" {
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return "unknown"
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} else {
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return eswitchInlineMode[inlinemode]
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}
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}
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func parseEswitchEncapMode(encapmode uint8) string {
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var eswitchEncapMode = map[uint8]string{
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nl.DEVLINK_ESWITCH_ENCAP_MODE_NONE: "disable",
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nl.DEVLINK_ESWITCH_ENCAP_MODE_BASIC: "enable",
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}
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if eswitchEncapMode[encapmode] == "" {
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return "unknown"
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} else {
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return eswitchEncapMode[encapmode]
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}
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}
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func (d *DevlinkDevice) parseAttributes(attrs []syscall.NetlinkRouteAttr) error {
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for _, a := range attrs {
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switch a.Attr.Type {
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case nl.DEVLINK_ATTR_BUS_NAME:
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d.BusName = string(a.Value)
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case nl.DEVLINK_ATTR_DEV_NAME:
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d.DeviceName = string(a.Value)
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case nl.DEVLINK_ATTR_ESWITCH_MODE:
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d.Attrs.Eswitch.Mode = parseEswitchMode(native.Uint16(a.Value))
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case nl.DEVLINK_ATTR_ESWITCH_INLINE_MODE:
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d.Attrs.Eswitch.InlineMode = parseEswitchInlineMode(uint8(a.Value[0]))
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case nl.DEVLINK_ATTR_ESWITCH_ENCAP_MODE:
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d.Attrs.Eswitch.EncapMode = parseEswitchEncapMode(uint8(a.Value[0]))
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}
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}
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return nil
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}
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func (dev *DevlinkDevice) parseEswitchAttrs(msgs [][]byte) {
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m := msgs[0]
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attrs, err := nl.ParseRouteAttr(m[nl.SizeofGenlmsg:])
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if err != nil {
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return
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}
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dev.parseAttributes(attrs)
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}
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func (h *Handle) getEswitchAttrs(family *GenlFamily, dev *DevlinkDevice) {
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msg := &nl.Genlmsg{
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Command: nl.DEVLINK_CMD_ESWITCH_GET,
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Version: nl.GENL_DEVLINK_VERSION,
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}
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req := h.newNetlinkRequest(int(family.ID), unix.NLM_F_REQUEST|unix.NLM_F_ACK)
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req.AddData(msg)
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b := make([]byte, len(dev.BusName))
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copy(b, dev.BusName)
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data := nl.NewRtAttr(nl.DEVLINK_ATTR_BUS_NAME, b)
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req.AddData(data)
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b = make([]byte, len(dev.DeviceName))
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copy(b, dev.DeviceName)
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data = nl.NewRtAttr(nl.DEVLINK_ATTR_DEV_NAME, b)
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req.AddData(data)
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msgs, err := req.Execute(unix.NETLINK_GENERIC, 0)
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if err != nil {
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return
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}
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dev.parseEswitchAttrs(msgs)
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}
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// DevLinkGetDeviceList provides a pointer to devlink devices and nil error,
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// otherwise returns an error code.
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func (h *Handle) DevLinkGetDeviceList() ([]*DevlinkDevice, error) {
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f, err := h.GenlFamilyGet(nl.GENL_DEVLINK_NAME)
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if err != nil {
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return nil, err
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}
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msg := &nl.Genlmsg{
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Command: nl.DEVLINK_CMD_GET,
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Version: nl.GENL_DEVLINK_VERSION,
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}
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req := h.newNetlinkRequest(int(f.ID),
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unix.NLM_F_REQUEST|unix.NLM_F_ACK|unix.NLM_F_DUMP)
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req.AddData(msg)
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msgs, err := req.Execute(unix.NETLINK_GENERIC, 0)
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if err != nil {
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return nil, err
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}
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devices, err := parseDevLinkDeviceList(msgs)
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if err != nil {
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return nil, err
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}
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for _, d := range devices {
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h.getEswitchAttrs(f, d)
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}
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return devices, nil
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}
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// DevLinkGetDeviceList provides a pointer to devlink devices and nil error,
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// otherwise returns an error code.
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func DevLinkGetDeviceList() ([]*DevlinkDevice, error) {
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return pkgHandle.DevLinkGetDeviceList()
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}
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func parseDevlinkDevice(msgs [][]byte) (*DevlinkDevice, error) {
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m := msgs[0]
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attrs, err := nl.ParseRouteAttr(m[nl.SizeofGenlmsg:])
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if err != nil {
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return nil, err
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}
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dev := &DevlinkDevice{}
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if err = dev.parseAttributes(attrs); err != nil {
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return nil, err
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}
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return dev, nil
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}
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func (h *Handle) createCmdReq(cmd uint8, bus string, device string) (*GenlFamily, *nl.NetlinkRequest, error) {
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f, err := h.GenlFamilyGet(nl.GENL_DEVLINK_NAME)
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if err != nil {
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return nil, nil, err
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}
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msg := &nl.Genlmsg{
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Command: cmd,
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Version: nl.GENL_DEVLINK_VERSION,
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}
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req := h.newNetlinkRequest(int(f.ID),
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unix.NLM_F_REQUEST|unix.NLM_F_ACK)
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req.AddData(msg)
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b := make([]byte, len(bus)+1)
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copy(b, bus)
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data := nl.NewRtAttr(nl.DEVLINK_ATTR_BUS_NAME, b)
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req.AddData(data)
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b = make([]byte, len(device)+1)
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copy(b, device)
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data = nl.NewRtAttr(nl.DEVLINK_ATTR_DEV_NAME, b)
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req.AddData(data)
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return f, req, nil
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}
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// DevlinkGetDeviceByName provides a pointer to devlink device and nil error,
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// otherwise returns an error code.
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func (h *Handle) DevLinkGetDeviceByName(Bus string, Device string) (*DevlinkDevice, error) {
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f, req, err := h.createCmdReq(nl.DEVLINK_CMD_GET, Bus, Device)
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if err != nil {
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return nil, err
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}
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respmsg, err := req.Execute(unix.NETLINK_GENERIC, 0)
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if err != nil {
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return nil, err
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}
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dev, err := parseDevlinkDevice(respmsg)
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if err == nil {
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h.getEswitchAttrs(f, dev)
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}
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return dev, err
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}
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// DevlinkGetDeviceByName provides a pointer to devlink device and nil error,
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// otherwise returns an error code.
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func DevLinkGetDeviceByName(Bus string, Device string) (*DevlinkDevice, error) {
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return pkgHandle.DevLinkGetDeviceByName(Bus, Device)
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}
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// DevLinkSetEswitchMode sets eswitch mode if able to set successfully or
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// returns an error code.
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// Equivalent to: `devlink dev eswitch set $dev mode switchdev`
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// Equivalent to: `devlink dev eswitch set $dev mode legacy`
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func (h *Handle) DevLinkSetEswitchMode(Dev *DevlinkDevice, NewMode string) error {
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mode, err := eswitchStringToMode(NewMode)
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if err != nil {
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return err
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}
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_, req, err := h.createCmdReq(nl.DEVLINK_CMD_ESWITCH_SET, Dev.BusName, Dev.DeviceName)
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if err != nil {
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return err
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}
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req.AddData(nl.NewRtAttr(nl.DEVLINK_ATTR_ESWITCH_MODE, nl.Uint16Attr(mode)))
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_, err = req.Execute(unix.NETLINK_GENERIC, 0)
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return err
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}
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// DevLinkSetEswitchMode sets eswitch mode if able to set successfully or
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// returns an error code.
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// Equivalent to: `devlink dev eswitch set $dev mode switchdev`
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// Equivalent to: `devlink dev eswitch set $dev mode legacy`
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func DevLinkSetEswitchMode(Dev *DevlinkDevice, NewMode string) error {
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return pkgHandle.DevLinkSetEswitchMode(Dev, NewMode)
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}
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