gomemif: update to libmemif version 4.0

Type: improvement

This patch provides:
1. interrupt mode support,
2. abstract socket support,
3. overriding responder example and divides it to two examples:
	-icmp_responder_cb
	-icmp_responder_poll

Signed-off-by: Daniel Béreš <dberes@cisco.com>
Change-Id: I99c86d053521760c457541fc596ed554f4077608

1 files changed, 326 insertions, 0 deletions

diff --git a/extras/gomemif/examples/icmp_responder_cb.go b/extras/gomemif/examples/icmp_responder_cb.go
new file mode 100644
index 00000000000..8d8adcfc892
--- /dev/null
+++ b/extras/gomemif/examples/icmp_responder_cb.go
@@ -0,0 +1,326 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"net"
+	"os"
+	"strings"
+	"sync"
+
+	"memif"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/pkg/profile"
+)
+
+func Disconnected(i *memif.Interface) error {
+	fmt.Println("Disconnected: ", i.GetName())
+
+	data, ok := i.GetPrivateData().(*interfaceData)
+	if !ok {
+		return fmt.Errorf("Invalid private data")
+	}
+	close(data.quitChan) // stop polling
+	close(data.errChan)
+	data.wg.Wait() // wait until polling stops, then continue disconnect
+
+	return nil
+}
+
+func Responder(i *memif.Interface) error {
+	data, ok := i.GetPrivateData().(*interfaceData)
+	if !ok {
+		return fmt.Errorf("Invalid private data")
+	}
+	data.errChan = make(chan error, 1)
+	data.quitChan = make(chan struct{}, 1)
+	data.wg.Add(1)
+
+	// allocate packet buffer
+	pkt := make([]byte, 2048)
+	// get rx queue
+	rxq0, err := i.GetRxQueue(0)
+	if err != nil {
+		return err
+	}
+	// get tx queue
+	txq0, err := i.GetTxQueue(0)
+	if err != nil {
+		return err
+	}
+	for {
+
+		// read packet from shared memory
+		pktLen, err := rxq0.ReadPacket(pkt)
+		_ = err
+		if pktLen > 0 {
+			fmt.Printf("pktLen: %d\n", pktLen)
+			gopkt := gopacket.NewPacket(pkt[:pktLen], layers.LayerTypeEthernet, gopacket.NoCopy)
+			etherLayer := gopkt.Layer(layers.LayerTypeEthernet)
+			if etherLayer.(*layers.Ethernet).EthernetType == layers.EthernetTypeARP {
+				rEth := layers.Ethernet{
+					SrcMAC: net.HardwareAddr{0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa},
+					DstMAC: net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
+
+					EthernetType: layers.EthernetTypeARP,
+				}
+				rArp := layers.ARP{
+					AddrType:          layers.LinkTypeEthernet,
+					Protocol:          layers.EthernetTypeIPv4,
+					HwAddressSize:     6,
+					ProtAddressSize:   4,
+					Operation:         layers.ARPReply,
+					SourceHwAddress:   []byte(net.HardwareAddr{0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa}),
+					SourceProtAddress: []byte("\xc0\xa8\x01\x01"),
+					DstHwAddress:      []byte(net.HardwareAddr{0x02, 0xfe, 0x08, 0x88, 0x45, 0x7f}),
+					DstProtAddress:    []byte("\xc0\xa8\x01\x02"),
+				}
+				buf := gopacket.NewSerializeBuffer()
+				opts := gopacket.SerializeOptions{
+					FixLengths:       true,
+					ComputeChecksums: true,
+				}
+				gopacket.SerializeLayers(buf, opts, &rEth, &rArp)
+				// write packet to shared memory
+				txq0.WritePacket(buf.Bytes())
+			}
+
+			if etherLayer.(*layers.Ethernet).EthernetType == layers.EthernetTypeIPv4 {
+				ipLayer := gopkt.Layer(layers.LayerTypeIPv4)
+				if ipLayer == nil {
+					fmt.Println("Missing IPv4 layer.")
+
+				}
+				ipv4, _ := ipLayer.(*layers.IPv4)
+				if ipv4.Protocol != layers.IPProtocolICMPv4 {
+					fmt.Println("Not ICMPv4 protocol.")
+				}
+				icmpLayer := gopkt.Layer(layers.LayerTypeICMPv4)
+				if icmpLayer == nil {
+					fmt.Println("Missing ICMPv4 layer.")
+				}
+				icmp, _ := icmpLayer.(*layers.ICMPv4)
+				if icmp.TypeCode.Type() != layers.ICMPv4TypeEchoRequest {
+					fmt.Println("Not ICMPv4 echo request.")
+				}
+				fmt.Println("Received an ICMPv4 echo request.")
+
+				// Build packet layers.
+				ethResp := layers.Ethernet{
+					DstMAC: net.HardwareAddr{0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa},
+					//DstMAC: net.HardwareAddr{0x02, 0xfe, 0xa8, 0x77, 0xaf, 0x20},
+					SrcMAC: []byte(net.HardwareAddr{0x02, 0xfe, 0x08, 0x88, 0x45, 0x7f}),
+
+					EthernetType: layers.EthernetTypeIPv4,
+				}
+				ipv4Resp := layers.IPv4{
+					Version:    4,
+					IHL:        5,
+					TOS:        0,
+					Id:         0,
+					Flags:      0,
+					FragOffset: 0,
+					TTL:        255,
+					Protocol:   layers.IPProtocolICMPv4,
+					SrcIP:      []byte("\xc0\xa8\x01\x01"),
+					DstIP:      []byte("\xc0\xa8\x01\x02"),
+				}
+				icmpResp := layers.ICMPv4{
+					TypeCode: layers.CreateICMPv4TypeCode(layers.ICMPv4TypeEchoReply, 0),
+					Id:       icmp.Id,
+					Seq:      icmp.Seq,
+				}
+
+				// Set up buffer and options for serialization.
+				buf := gopacket.NewSerializeBuffer()
+				opts := gopacket.SerializeOptions{
+					FixLengths:       true,
+					ComputeChecksums: true,
+				}
+				gopacket.SerializeLayers(buf, opts, &ethResp, &ipv4Resp, &icmpResp,
+					gopacket.Payload(icmp.Payload))
+				// write packet to shared memory
+				txq0.WritePacket(buf.Bytes())
+			}
+
+		}
+		return nil
+
+	}
+
+}
+func Connected(i *memif.Interface) error {
+	data, ok := i.GetPrivateData().(*interfaceData)
+	if !ok {
+		return fmt.Errorf("Invalid private data")
+	}
+	_ = data
+
+	// allocate packet buffer
+	pkt := make([]byte, 2048)
+	// get rx queue
+	rxq0, err := i.GetRxQueue(0)
+	_ = err
+
+	// read packet from shared memory
+	pktLen, err := rxq0.ReadPacket(pkt)
+	_, _ = err, pktLen
+
+	return nil
+}
+
+type interfaceData struct {
+	errChan  chan error
+	quitChan chan struct{}
+	wg       sync.WaitGroup
+}
+
+func interractiveHelp() {
+	fmt.Println("help - print this help")
+	fmt.Println("start - start connecting loop")
+	fmt.Println("show - print interface details")
+	fmt.Println("exit - exit the application")
+}
+
+func main() {
+	cpuprof := flag.String("cpuprof", "", "cpu profiling output file")
+	memprof := flag.String("memprof", "", "mem profiling output file")
+	role := flag.String("role", "slave", "interface role")
+	name := flag.String("name", "gomemif", "interface name")
+	socketName := flag.String("socket", "/run/vpp/memif.sock", "control socket filename")
+
+	flag.Parse()
+
+	if *cpuprof != "" {
+		defer profile.Start(profile.CPUProfile, profile.ProfilePath(*cpuprof)).Stop()
+	}
+	if *memprof != "" {
+		defer profile.Start(profile.MemProfile, profile.ProfilePath(*memprof)).Stop()
+	}
+
+	memifErrChan := make(chan error)
+	exitChan := make(chan struct{})
+
+	var isMaster bool
+	switch *role {
+	case "slave":
+		isMaster = false
+	case "master":
+		isMaster = true
+	default:
+		fmt.Println("Invalid role")
+		return
+	}
+
+	fmt.Println("GoMemif: Responder")
+	fmt.Println("-----------------------")
+
+	socket, err := memif.NewSocket("gomemif_example", *socketName)
+	if err != nil {
+		fmt.Println("Failed to create socket: ", err)
+		return
+	}
+
+	data := interfaceData{}
+	args := &memif.Arguments{
+		IsMaster:         isMaster,
+		ConnectedFunc:    Connected,
+		DisconnectedFunc: Disconnected,
+		PrivateData:      &data,
+		Name:             *name,
+		InterruptFunc:    Responder,
+	}
+
+	i, err := socket.NewInterface(args)
+	if err != nil {
+		fmt.Println("Failed to create interface on socket %s: %s", socket.GetFilename(), err)
+		goto exit
+	}
+
+	// slave attempts to connect to control socket
+	// to handle control communication call socket.StartPolling()
+	if !i.IsMaster() {
+		fmt.Println(args.Name, ": Connecting to control socket...")
+		for !i.IsConnecting() {
+			err = i.RequestConnection()
+			if err != nil {
+				/* TODO: check for ECONNREFUSED errno
+				 * if error is ECONNREFUSED it may simply mean that master
+				 * interface is not up yet, use i.RequestConnection()
+				 */
+				fmt.Println("Failed to connect: ", err)
+				goto exit
+			}
+		}
+	}
+
+	go func(exitChan chan<- struct{}) {
+		reader := bufio.NewReader(os.Stdin)
+		for {
+			fmt.Print("gomemif# ")
+			text, _ := reader.ReadString('\n')
+			// convert CRLF to LF
+			text = strings.Replace(text, "\n", "", -1)
+			switch text {
+			case "help":
+				interractiveHelp()
+			case "start":
+				// start polling for events on this socket
+				socket.StartPolling(memifErrChan)
+			case "show":
+				fmt.Println("remote: ", i.GetRemoteName())
+				fmt.Println("peer: ", i.GetPeerName())
+			case "exit":
+				err = socket.StopPolling()
+				if err != nil {
+					fmt.Println("Failed to stop polling: ", err)
+				}
+				close(exitChan)
+				return
+			default:
+				fmt.Println("Unknown input")
+			}
+		}
+	}(exitChan)
+
+	for {
+		select {
+		case <-exitChan:
+			goto exit
+		case err, ok := <-memifErrChan:
+			if ok {
+				fmt.Println(err)
+			}
+		case err, ok := <-data.errChan:
+			if ok {
+				fmt.Println(err)
+			}
+		default:
+			continue
+		}
+	}
+
+exit:
+	socket.Delete()
+	close(memifErrChan)
+}