extras/hs-test/vppinstance.go - fdio/vpp - Gitiles

 package main

 import (
 	"context"
 	"fmt"
 	"io"
 	"os"
 	"os/exec"
 	"os/signal"
 	"strconv"
 	"strings"
 	"syscall"
 	"time"

 	"github.com/edwarnicke/exechelper"
 	. "github.com/onsi/ginkgo/v2"
 	"github.com/sirupsen/logrus"

 	"go.fd.io/govpp"
 	"go.fd.io/govpp/api"
 	"go.fd.io/govpp/binapi/af_packet"
 	interfaces "go.fd.io/govpp/binapi/interface"
 	"go.fd.io/govpp/binapi/interface_types"
 	"go.fd.io/govpp/binapi/session"
 	"go.fd.io/govpp/binapi/tapv2"
 	"go.fd.io/govpp/core"
 )

 const vppConfigTemplate = `unix {
   nodaemon
   log %[1]s%[4]s
   full-coredump
   cli-listen %[1]s%[2]s
   runtime-dir %[1]s/var/run
   gid vpp
 }

 api-trace {
   on
 }

 api-segment {
   gid vpp
 }

 socksvr {
   socket-name %[1]s%[3]s
 }

 statseg {
   socket-name %[1]s/var/run/vpp/stats.sock
 }

 plugins {
   plugin default { disable }

   plugin unittest_plugin.so { enable }
   plugin quic_plugin.so { enable }
   plugin af_packet_plugin.so { enable }
   plugin hs_apps_plugin.so { enable }
   plugin http_plugin.so { enable }
   plugin http_static_plugin.so { enable }
   plugin prom_plugin.so { enable }
   plugin tlsopenssl_plugin.so { enable }
   plugin ping_plugin.so { enable }
   plugin nsim_plugin.so { enable }
 }

 logging {
   default-log-level debug
   default-syslog-log-level debug
 }

 `

 const (
 	defaultCliSocketFilePath = "/var/run/vpp/cli.sock"
 	defaultApiSocketFilePath = "/var/run/vpp/api.sock"
 	defaultLogFilePath       = "/var/log/vpp/vpp.log"
 )

 type VppInstance struct {
 	container        *Container
 	additionalConfig []Stanza
 	connection       *core.Connection
 	apiStream        api.Stream
 	cpus             []int
 }

 func (vpp *VppInstance) getSuite() *HstSuite {
 	return vpp.container.suite
 }

 func (vpp *VppInstance) getCliSocket() string {
 	return fmt.Sprintf("%s%s", vpp.container.getContainerWorkDir(), defaultCliSocketFilePath)
 }

 func (vpp *VppInstance) getRunDir() string {
 	return vpp.container.getContainerWorkDir() + "/var/run/vpp"
 }

 func (vpp *VppInstance) getLogDir() string {
 	return vpp.container.getContainerWorkDir() + "/var/log/vpp"
 }

 func (vpp *VppInstance) getEtcDir() string {
 	return vpp.container.getContainerWorkDir() + "/etc/vpp"
 }

 func (vpp *VppInstance) start() error {
 	// Replace default logger in govpp with our own
 	govppLogger := logrus.New()
 	govppLogger.SetOutput(io.MultiWriter(vpp.getSuite().logger.Writer(), GinkgoWriter))
 	core.SetLogger(govppLogger)
 	// Create folders
 	containerWorkDir := vpp.container.getContainerWorkDir()

 	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getRunDir())
 	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getLogDir())
 	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getEtcDir())

 	// Create startup.conf inside the container
 	configContent := fmt.Sprintf(
 		vppConfigTemplate,
 		containerWorkDir,
 		defaultCliSocketFilePath,
 		defaultApiSocketFilePath,
 		defaultLogFilePath,
 	)
 	configContent += vpp.generateCpuConfig()
 	for _, c := range vpp.additionalConfig {
 		configContent += c.toString()
 	}
 	startupFileName := vpp.getEtcDir() + "/startup.conf"
 	vpp.container.createFile(startupFileName, configContent)

 	// create wrapper script for vppctl with proper CLI socket path
 	cliContent := "#!/usr/bin/bash\nvppctl -s " + vpp.getRunDir() + "/cli.sock"
 	vppcliFileName := "/usr/bin/vppcli"
 	vpp.container.createFile(vppcliFileName, cliContent)
 	vpp.container.exec("chmod 0755 " + vppcliFileName)

 	vpp.getSuite().log("starting vpp")
 	if *isVppDebug {
 		sig := make(chan os.Signal, 1)
 		signal.Notify(sig, syscall.SIGQUIT)
 		cont := make(chan bool, 1)
 		go func() {
 			<-sig
 			cont <- true
 		}()

 		vpp.container.execServer("su -c \"vpp -c " + startupFileName + " &> /proc/1/fd/1\"")
 		fmt.Println("run following command in different terminal:")
 		fmt.Println("docker exec -it " + vpp.container.name + " gdb -ex \"attach $(docker exec " + vpp.container.name + " pidof vpp)\"")
 		fmt.Println("Afterwards press CTRL+\\ to continue")
 		<-cont
 		fmt.Println("continuing...")
 	} else {
 		// Start VPP
 		vpp.container.execServer("su -c \"vpp -c " + startupFileName + " &> /proc/1/fd/1\"")
 	}

 	vpp.getSuite().log("connecting to vpp")
 	// Connect to VPP and store the connection
 	sockAddress := vpp.container.getHostWorkDir() + defaultApiSocketFilePath
 	conn, connEv, err := govpp.AsyncConnect(
 		sockAddress,
 		core.DefaultMaxReconnectAttempts,
 		core.DefaultReconnectInterval)
 	if err != nil {
 		vpp.getSuite().log("async connect error: " + fmt.Sprint(err))
 		return err
 	}
 	vpp.connection = conn

 	// ... wait for Connected event
 	e := <-connEv
 	if e.State != core.Connected {
 		vpp.getSuite().log("connecting to VPP failed: " + fmt.Sprint(e.Error))
 	}

 	ch, err := conn.NewStream(
 		context.Background(),
 		core.WithRequestSize(50),
 		core.WithReplySize(50),
 		core.WithReplyTimeout(time.Second*10))
 	if err != nil {
 		vpp.getSuite().log("creating stream failed: " + fmt.Sprint(err))
 		return err
 	}
 	vpp.apiStream = ch

 	return nil
 }

 func (vpp *VppInstance) vppctl(command string, arguments ...any) string {
 	vppCliCommand := fmt.Sprintf(command, arguments...)
 	containerExecCommand := fmt.Sprintf("docker exec --detach=false %[1]s vppctl -s %[2]s %[3]s",
 		vpp.container.name, vpp.getCliSocket(), vppCliCommand)
 	vpp.getSuite().log(containerExecCommand)
 	output, err := exechelper.CombinedOutput(containerExecCommand)
 	vpp.getSuite().assertNil(err)

 	return string(output)
 }

 func (vpp *VppInstance) GetSessionStat(stat string) int {
 	o := vpp.vppctl("show session stats")
 	vpp.getSuite().log(o)
 	for _, line := range strings.Split(o, "\n") {
 		if strings.Contains(line, stat) {
 			tokens := strings.Split(strings.TrimSpace(line), " ")
 			val, err := strconv.Atoi(tokens[0])
 			if err != nil {
 				Fail("failed to parse stat value %s" + fmt.Sprint(err))
 				return 0
 			}
 			return val
 		}
 	}
 	return 0
 }

 func (vpp *VppInstance) waitForApp(appName string, timeout int) {
 	vpp.getSuite().log("waiting for app " + appName)
 	for i := 0; i < timeout; i++ {
 		o := vpp.vppctl("show app")
 		if strings.Contains(o, appName) {
 			return
 		}
 		time.Sleep(1 * time.Second)
 	}
 	vpp.getSuite().assertNil(1, "Timeout while waiting for app '%s'", appName)
 }

 func (vpp *VppInstance) createAfPacket(
 	veth *NetInterface,
 ) (interface_types.InterfaceIndex, error) {
 	createReq := &af_packet.AfPacketCreateV3{
 		Mode:            1,
 		UseRandomHwAddr: true,
 		HostIfName:      veth.Name(),
 		Flags:           af_packet.AfPacketFlags(11),
 	}
 	if veth.hwAddress != (MacAddress{}) {
 		createReq.UseRandomHwAddr = false
 		createReq.HwAddr = veth.hwAddress
 	}

 	vpp.getSuite().log("create af-packet interface " + veth.Name())
 	if err := vpp.apiStream.SendMsg(createReq); err != nil {
 		vpp.getSuite().hstFail()
 		return 0, err
 	}
 	replymsg, err := vpp.apiStream.RecvMsg()
 	if err != nil {
 		return 0, err
 	}
 	reply := replymsg.(*af_packet.AfPacketCreateV3Reply)
 	err = api.RetvalToVPPApiError(reply.Retval)
 	if err != nil {
 		return 0, err
 	}

 	veth.index = reply.SwIfIndex

 	// Set to up
 	upReq := &interfaces.SwInterfaceSetFlags{
 		SwIfIndex: veth.index,
 		Flags:     interface_types.IF_STATUS_API_FLAG_ADMIN_UP,
 	}

 	vpp.getSuite().log("set af-packet interface " + veth.Name() + " up")
 	if err := vpp.apiStream.SendMsg(upReq); err != nil {
 		return 0, err
 	}
 	replymsg, err = vpp.apiStream.RecvMsg()
 	if err != nil {
 		return 0, err
 	}
 	reply2 := replymsg.(*interfaces.SwInterfaceSetFlagsReply)
 	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
 		return 0, err
 	}

 	// Add address
 	if veth.addressWithPrefix() == (AddressWithPrefix{}) {
 		var err error
 		var ip4Address string
 		if ip4Address, err = veth.ip4AddrAllocator.NewIp4InterfaceAddress(veth.peer.networkNumber); err == nil {
 			veth.ip4Address = ip4Address
 		} else {
 			return 0, err
 		}
 	}
 	addressReq := &interfaces.SwInterfaceAddDelAddress{
 		IsAdd:     true,
 		SwIfIndex: veth.index,
 		Prefix:    veth.addressWithPrefix(),
 	}

 	vpp.getSuite().log("af-packet interface " + veth.Name() + " add address " + veth.ip4Address)
 	if err := vpp.apiStream.SendMsg(addressReq); err != nil {
 		return 0, err
 	}
 	replymsg, err = vpp.apiStream.RecvMsg()
 	if err != nil {
 		return 0, err
 	}
 	reply3 := replymsg.(*interfaces.SwInterfaceAddDelAddressReply)
 	err = api.RetvalToVPPApiError(reply3.Retval)
 	if err != nil {
 		return 0, err
 	}

 	return veth.index, nil
 }

 func (vpp *VppInstance) addAppNamespace(
 	secret uint64,
 	ifx interface_types.InterfaceIndex,
 	namespaceId string,
 ) error {
 	req := &session.AppNamespaceAddDelV4{
 		IsAdd:       true,
 		Secret:      secret,
 		SwIfIndex:   ifx,
 		NamespaceID: namespaceId,
 		SockName:    defaultApiSocketFilePath,
 	}

 	vpp.getSuite().log("add app namespace " + namespaceId)
 	if err := vpp.apiStream.SendMsg(req); err != nil {
 		return err
 	}
 	replymsg, err := vpp.apiStream.RecvMsg()
 	if err != nil {
 		return err
 	}
 	reply := replymsg.(*session.AppNamespaceAddDelV4Reply)
 	if err = api.RetvalToVPPApiError(reply.Retval); err != nil {
 		return err
 	}

 	sessionReq := &session.SessionEnableDisable{
 		IsEnable: true,
 	}

 	vpp.getSuite().log("enable app namespace " + namespaceId)
 	if err := vpp.apiStream.SendMsg(sessionReq); err != nil {
 		return err
 	}
 	replymsg, err = vpp.apiStream.RecvMsg()
 	if err != nil {
 		return err
 	}
 	reply2 := replymsg.(*session.SessionEnableDisableReply)
 	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
 		return err
 	}

 	return nil
 }

 func (vpp *VppInstance) createTap(
 	tap *NetInterface,
 	tapId ...uint32,
 ) error {
 	var id uint32 = 1
 	if len(tapId) > 0 {
 		id = tapId[0]
 	}
 	createTapReq := &tapv2.TapCreateV3{
 		ID:               id,
 		HostIfNameSet:    true,
 		HostIfName:       tap.Name(),
 		HostIP4PrefixSet: true,
 		HostIP4Prefix:    tap.ip4AddressWithPrefix(),
 	}

 	vpp.getSuite().log("create tap interface " + tap.Name())
 	// Create tap interface
 	if err := vpp.apiStream.SendMsg(createTapReq); err != nil {
 		return err
 	}
 	replymsg, err := vpp.apiStream.RecvMsg()
 	if err != nil {
 		return err
 	}
 	reply := replymsg.(*tapv2.TapCreateV3Reply)
 	if err = api.RetvalToVPPApiError(reply.Retval); err != nil {
 		return err
 	}

 	// Add address
 	addAddressReq := &interfaces.SwInterfaceAddDelAddress{
 		IsAdd:     true,
 		SwIfIndex: reply.SwIfIndex,
 		Prefix:    tap.peer.addressWithPrefix(),
 	}

 	vpp.getSuite().log("tap interface " + tap.Name() + " add address " + tap.peer.ip4Address)
 	if err := vpp.apiStream.SendMsg(addAddressReq); err != nil {
 		return err
 	}
 	replymsg, err = vpp.apiStream.RecvMsg()
 	if err != nil {
 		return err
 	}
 	reply2 := replymsg.(*interfaces.SwInterfaceAddDelAddressReply)
 	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
 		return err
 	}

 	// Set interface to up
 	upReq := &interfaces.SwInterfaceSetFlags{
 		SwIfIndex: reply.SwIfIndex,
 		Flags:     interface_types.IF_STATUS_API_FLAG_ADMIN_UP,
 	}

 	vpp.getSuite().log("set tap interface " + tap.Name() + " up")
 	if err := vpp.apiStream.SendMsg(upReq); err != nil {
 		return err
 	}
 	replymsg, err = vpp.apiStream.RecvMsg()
 	if err != nil {
 		return err
 	}
 	reply3 := replymsg.(*interfaces.SwInterfaceSetFlagsReply)
 	if err = api.RetvalToVPPApiError(reply3.Retval); err != nil {
 		return err
 	}

 	return nil
 }

 func (vpp *VppInstance) saveLogs() {
 	logTarget := vpp.container.getLogDirPath() + "vppinstance-" + vpp.container.name + ".log"
 	logSource := vpp.container.getHostWorkDir() + defaultLogFilePath
 	cmd := exec.Command("cp", logSource, logTarget)
 	vpp.getSuite().log(cmd.String())
 	cmd.Run()
 }

 func (vpp *VppInstance) disconnect() {
 	vpp.connection.Disconnect()
 	vpp.apiStream.Close()
 }

 func (vpp *VppInstance) generateCpuConfig() string {
 	var c Stanza
 	var s string
 	if len(vpp.cpus) < 1 {
 		return ""
 	}
 	c.newStanza("cpu").
 		append(fmt.Sprintf("main-core %d", vpp.cpus[0]))
 	vpp.getSuite().log(fmt.Sprintf("main-core %d", vpp.cpus[0]))
 	workers := vpp.cpus[1:]

 	if len(workers) > 0 {
 		for i := 0; i < len(workers); i++ {
 			if i != 0 {
 				s = s + ", "
 			}
 			s = s + fmt.Sprintf("%d", workers[i])
 		}
 		c.append(fmt.Sprintf("corelist-workers %s", s))
 		vpp.getSuite().log("corelist-workers " + s)
 	}
 	return c.close().toString()
 }
	package main

	import (
	"context"
	"fmt"
	"io"
	"os"
	"os/exec"
	"os/signal"
	"strconv"
	"strings"
	"syscall"
	"time"

	"github.com/edwarnicke/exechelper"
	. "github.com/onsi/ginkgo/v2"
	"github.com/sirupsen/logrus"

	"go.fd.io/govpp"
	"go.fd.io/govpp/api"
	"go.fd.io/govpp/binapi/af_packet"
	interfaces "go.fd.io/govpp/binapi/interface"
	"go.fd.io/govpp/binapi/interface_types"
	"go.fd.io/govpp/binapi/session"
	"go.fd.io/govpp/binapi/tapv2"
	"go.fd.io/govpp/core"
	)

	const vppConfigTemplate = `unix {
	nodaemon
	log %[1]s%[4]s
	full-coredump
	cli-listen %[1]s%[2]s
	runtime-dir %[1]s/var/run
	gid vpp
	}

	api-trace {
	on
	}

	api-segment {
	gid vpp
	}

	socksvr {
	socket-name %[1]s%[3]s
	}

	statseg {
	socket-name %[1]s/var/run/vpp/stats.sock
	}

	plugins {
	plugin default { disable }

	plugin unittest_plugin.so { enable }
	plugin quic_plugin.so { enable }
	plugin af_packet_plugin.so { enable }
	plugin hs_apps_plugin.so { enable }
	plugin http_plugin.so { enable }
	plugin http_static_plugin.so { enable }
	plugin prom_plugin.so { enable }
	plugin tlsopenssl_plugin.so { enable }
	plugin ping_plugin.so { enable }
	plugin nsim_plugin.so { enable }
	}

	logging {
	default-log-level debug
	default-syslog-log-level debug
	}

	`

	const (
	defaultCliSocketFilePath = "/var/run/vpp/cli.sock"
	defaultApiSocketFilePath = "/var/run/vpp/api.sock"
	defaultLogFilePath = "/var/log/vpp/vpp.log"
	)

	type VppInstance struct {
	container *Container
	additionalConfig []Stanza
	connection *core.Connection
	apiStream api.Stream
	cpus []int
	}

	func (vpp VppInstance) getSuite() HstSuite {
	return vpp.container.suite
	}

	func (vpp *VppInstance) getCliSocket() string {
	return fmt.Sprintf("%s%s", vpp.container.getContainerWorkDir(), defaultCliSocketFilePath)
	}

	func (vpp *VppInstance) getRunDir() string {
	return vpp.container.getContainerWorkDir() + "/var/run/vpp"
	}

	func (vpp *VppInstance) getLogDir() string {
	return vpp.container.getContainerWorkDir() + "/var/log/vpp"
	}

	func (vpp *VppInstance) getEtcDir() string {
	return vpp.container.getContainerWorkDir() + "/etc/vpp"
	}

	func (vpp *VppInstance) start() error {
	// Replace default logger in govpp with our own
	govppLogger := logrus.New()
	govppLogger.SetOutput(io.MultiWriter(vpp.getSuite().logger.Writer(), GinkgoWriter))
	core.SetLogger(govppLogger)
	// Create folders
	containerWorkDir := vpp.container.getContainerWorkDir()

	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getRunDir())
	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getLogDir())
	vpp.container.exec("mkdir --mode=0700 -p " + vpp.getEtcDir())

	// Create startup.conf inside the container
	configContent := fmt.Sprintf(
	vppConfigTemplate,
	containerWorkDir,
	defaultCliSocketFilePath,
	defaultApiSocketFilePath,
	defaultLogFilePath,
	)
	configContent += vpp.generateCpuConfig()
	for _, c := range vpp.additionalConfig {
	configContent += c.toString()
	}
	startupFileName := vpp.getEtcDir() + "/startup.conf"
	vpp.container.createFile(startupFileName, configContent)

	// create wrapper script for vppctl with proper CLI socket path
	cliContent := "#!/usr/bin/bash\nvppctl -s " + vpp.getRunDir() + "/cli.sock"
	vppcliFileName := "/usr/bin/vppcli"
	vpp.container.createFile(vppcliFileName, cliContent)
	vpp.container.exec("chmod 0755 " + vppcliFileName)

	vpp.getSuite().log("starting vpp")
	if *isVppDebug {
	sig := make(chan os.Signal, 1)
	signal.Notify(sig, syscall.SIGQUIT)
	cont := make(chan bool, 1)
	go func() {
	<-sig
	cont <- true
	}()

	vpp.container.execServer("su -c \"vpp -c " + startupFileName + " &> /proc/1/fd/1\"")
	fmt.Println("run following command in different terminal:")
	fmt.Println("docker exec -it " + vpp.container.name + " gdb -ex \"attach $(docker exec " + vpp.container.name + " pidof vpp)\"")
	fmt.Println("Afterwards press CTRL+\\ to continue")
	<-cont
	fmt.Println("continuing...")
	} else {
	// Start VPP
	vpp.container.execServer("su -c \"vpp -c " + startupFileName + " &> /proc/1/fd/1\"")
	}

	vpp.getSuite().log("connecting to vpp")
	// Connect to VPP and store the connection
	sockAddress := vpp.container.getHostWorkDir() + defaultApiSocketFilePath
	conn, connEv, err := govpp.AsyncConnect(
	sockAddress,
	core.DefaultMaxReconnectAttempts,
	core.DefaultReconnectInterval)
	if err != nil {
	vpp.getSuite().log("async connect error: " + fmt.Sprint(err))
	return err
	}
	vpp.connection = conn

	// ... wait for Connected event
	e := <-connEv
	if e.State != core.Connected {
	vpp.getSuite().log("connecting to VPP failed: " + fmt.Sprint(e.Error))
	}

	ch, err := conn.NewStream(
	context.Background(),
	core.WithRequestSize(50),
	core.WithReplySize(50),
	core.WithReplyTimeout(time.Second*10))
	if err != nil {
	vpp.getSuite().log("creating stream failed: " + fmt.Sprint(err))
	return err
	}
	vpp.apiStream = ch

	return nil
	}

	func (vpp *VppInstance) vppctl(command string, arguments ...any) string {
	vppCliCommand := fmt.Sprintf(command, arguments...)
	containerExecCommand := fmt.Sprintf("docker exec --detach=false %[1]s vppctl -s %[2]s %[3]s",
	vpp.container.name, vpp.getCliSocket(), vppCliCommand)
	vpp.getSuite().log(containerExecCommand)
	output, err := exechelper.CombinedOutput(containerExecCommand)
	vpp.getSuite().assertNil(err)

	return string(output)
	}

	func (vpp *VppInstance) GetSessionStat(stat string) int {
	o := vpp.vppctl("show session stats")
	vpp.getSuite().log(o)
	for _, line := range strings.Split(o, "\n") {
	if strings.Contains(line, stat) {
	tokens := strings.Split(strings.TrimSpace(line), " ")
	val, err := strconv.Atoi(tokens[0])
	if err != nil {
	Fail("failed to parse stat value %s" + fmt.Sprint(err))
	return 0
	}
	return val
	}
	}
	return 0
	}

	func (vpp *VppInstance) waitForApp(appName string, timeout int) {
	vpp.getSuite().log("waiting for app " + appName)
	for i := 0; i < timeout; i++ {
	o := vpp.vppctl("show app")
	if strings.Contains(o, appName) {
	return
	}
	time.Sleep(1 * time.Second)
	}
	vpp.getSuite().assertNil(1, "Timeout while waiting for app '%s'", appName)
	}

	func (vpp *VppInstance) createAfPacket(
	veth *NetInterface,
	) (interface_types.InterfaceIndex, error) {
	createReq := &af_packet.AfPacketCreateV3{
	Mode: 1,
	UseRandomHwAddr: true,
	HostIfName: veth.Name(),
	Flags: af_packet.AfPacketFlags(11),
	}
	if veth.hwAddress != (MacAddress{}) {
	createReq.UseRandomHwAddr = false
	createReq.HwAddr = veth.hwAddress
	}

	vpp.getSuite().log("create af-packet interface " + veth.Name())
	if err := vpp.apiStream.SendMsg(createReq); err != nil {
	vpp.getSuite().hstFail()
	return 0, err
	}
	replymsg, err := vpp.apiStream.RecvMsg()
	if err != nil {
	return 0, err
	}
	reply := replymsg.(*af_packet.AfPacketCreateV3Reply)
	err = api.RetvalToVPPApiError(reply.Retval)
	if err != nil {
	return 0, err
	}

	veth.index = reply.SwIfIndex

	// Set to up
	upReq := &interfaces.SwInterfaceSetFlags{
	SwIfIndex: veth.index,
	Flags: interface_types.IF_STATUS_API_FLAG_ADMIN_UP,
	}

	vpp.getSuite().log("set af-packet interface " + veth.Name() + " up")
	if err := vpp.apiStream.SendMsg(upReq); err != nil {
	return 0, err
	}
	replymsg, err = vpp.apiStream.RecvMsg()
	if err != nil {
	return 0, err
	}
	reply2 := replymsg.(*interfaces.SwInterfaceSetFlagsReply)
	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
	return 0, err
	}

	// Add address
	if veth.addressWithPrefix() == (AddressWithPrefix{}) {
	var err error
	var ip4Address string
	if ip4Address, err = veth.ip4AddrAllocator.NewIp4InterfaceAddress(veth.peer.networkNumber); err == nil {
	veth.ip4Address = ip4Address
	} else {
	return 0, err
	}
	}
	addressReq := &interfaces.SwInterfaceAddDelAddress{
	IsAdd: true,
	SwIfIndex: veth.index,
	Prefix: veth.addressWithPrefix(),
	}

	vpp.getSuite().log("af-packet interface " + veth.Name() + " add address " + veth.ip4Address)
	if err := vpp.apiStream.SendMsg(addressReq); err != nil {
	return 0, err
	}
	replymsg, err = vpp.apiStream.RecvMsg()
	if err != nil {
	return 0, err
	}
	reply3 := replymsg.(*interfaces.SwInterfaceAddDelAddressReply)
	err = api.RetvalToVPPApiError(reply3.Retval)
	if err != nil {
	return 0, err
	}

	return veth.index, nil
	}

	func (vpp *VppInstance) addAppNamespace(
	secret uint64,
	ifx interface_types.InterfaceIndex,
	namespaceId string,
	) error {
	req := &session.AppNamespaceAddDelV4{
	IsAdd: true,
	Secret: secret,
	SwIfIndex: ifx,
	NamespaceID: namespaceId,
	SockName: defaultApiSocketFilePath,
	}

	vpp.getSuite().log("add app namespace " + namespaceId)
	if err := vpp.apiStream.SendMsg(req); err != nil {
	return err
	}
	replymsg, err := vpp.apiStream.RecvMsg()
	if err != nil {
	return err
	}
	reply := replymsg.(*session.AppNamespaceAddDelV4Reply)
	if err = api.RetvalToVPPApiError(reply.Retval); err != nil {
	return err
	}

	sessionReq := &session.SessionEnableDisable{
	IsEnable: true,
	}

	vpp.getSuite().log("enable app namespace " + namespaceId)
	if err := vpp.apiStream.SendMsg(sessionReq); err != nil {
	return err
	}
	replymsg, err = vpp.apiStream.RecvMsg()
	if err != nil {
	return err
	}
	reply2 := replymsg.(*session.SessionEnableDisableReply)
	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
	return err
	}

	return nil
	}

	func (vpp *VppInstance) createTap(
	tap *NetInterface,
	tapId ...uint32,
	) error {
	var id uint32 = 1
	if len(tapId) > 0 {
	id = tapId[0]
	}
	createTapReq := &tapv2.TapCreateV3{
	ID: id,
	HostIfNameSet: true,
	HostIfName: tap.Name(),
	HostIP4PrefixSet: true,
	HostIP4Prefix: tap.ip4AddressWithPrefix(),
	}

	vpp.getSuite().log("create tap interface " + tap.Name())
	// Create tap interface
	if err := vpp.apiStream.SendMsg(createTapReq); err != nil {
	return err
	}
	replymsg, err := vpp.apiStream.RecvMsg()
	if err != nil {
	return err
	}
	reply := replymsg.(*tapv2.TapCreateV3Reply)
	if err = api.RetvalToVPPApiError(reply.Retval); err != nil {
	return err
	}

	// Add address
	addAddressReq := &interfaces.SwInterfaceAddDelAddress{
	IsAdd: true,
	SwIfIndex: reply.SwIfIndex,
	Prefix: tap.peer.addressWithPrefix(),
	}

	vpp.getSuite().log("tap interface " + tap.Name() + " add address " + tap.peer.ip4Address)
	if err := vpp.apiStream.SendMsg(addAddressReq); err != nil {
	return err
	}
	replymsg, err = vpp.apiStream.RecvMsg()
	if err != nil {
	return err
	}
	reply2 := replymsg.(*interfaces.SwInterfaceAddDelAddressReply)
	if err = api.RetvalToVPPApiError(reply2.Retval); err != nil {
	return err
	}

	// Set interface to up
	upReq := &interfaces.SwInterfaceSetFlags{
	SwIfIndex: reply.SwIfIndex,
	Flags: interface_types.IF_STATUS_API_FLAG_ADMIN_UP,
	}

	vpp.getSuite().log("set tap interface " + tap.Name() + " up")
	if err := vpp.apiStream.SendMsg(upReq); err != nil {
	return err
	}
	replymsg, err = vpp.apiStream.RecvMsg()
	if err != nil {
	return err
	}
	reply3 := replymsg.(*interfaces.SwInterfaceSetFlagsReply)
	if err = api.RetvalToVPPApiError(reply3.Retval); err != nil {
	return err
	}

	return nil
	}

	func (vpp *VppInstance) saveLogs() {
	logTarget := vpp.container.getLogDirPath() + "vppinstance-" + vpp.container.name + ".log"
	logSource := vpp.container.getHostWorkDir() + defaultLogFilePath
	cmd := exec.Command("cp", logSource, logTarget)
	vpp.getSuite().log(cmd.String())
	cmd.Run()
	}

	func (vpp *VppInstance) disconnect() {
	vpp.connection.Disconnect()
	vpp.apiStream.Close()
	}

	func (vpp *VppInstance) generateCpuConfig() string {
	var c Stanza
	var s string
	if len(vpp.cpus) < 1 {
	return ""
	}
	c.newStanza("cpu").
	append(fmt.Sprintf("main-core %d", vpp.cpus[0]))
	vpp.getSuite().log(fmt.Sprintf("main-core %d", vpp.cpus[0]))
	workers := vpp.cpus[1:]

	if len(workers) > 0 {
	for i := 0; i < len(workers); i++ {
	if i != 0 {
	s = s + ", "
	}
	s = s + fmt.Sprintf("%d", workers[i])
	}
	c.append(fmt.Sprintf("corelist-workers %s", s))
	vpp.getSuite().log("corelist-workers " + s)
	}
	return c.close().toString()
	}