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

7 files changed, 553 insertions, 10 deletions

diff --git a/extras/gomemif/README.rst b/extras/gomemif/README.rst
new file mode 100644
index 00000000000..18f382893c9
--- /dev/null
+++ b/extras/gomemif/README.rst
@@ -0,0 +1,50 @@
+.. _gomemif_doc:
+
+Gomemif library
+=======================
+
+Memif library implemented in Go. The package contains 3 examples: Bridge and ICMP responder in interrupt and polling mode.
+
+setup and run
+-------------
+To Build all examples
+
+::
+
+   bazel build //...
+
+To Run ICMP responder in interrupt mode:
+
+::
+
+   DBGvpp# create interface memif id 0 master no-zero-copy
+   DBGvpp# set int ip addr memif0/0 192.168.1.2/24
+   DBGvpp# set int state memif0/0 up
+
+   bazel-bin/examples/linux_amd64_stripped/icmp_responder_cb
+   gomemif# start
+
+   DBGvpp# ping 192.168.1.1
+
+To Run ICMP responder in polling mode:
+
+::
+
+   DBGvpp# create interface memif id 0 master no-zero-copy
+   DBGvpp# set int ip addr memif0/0 192.168.1.2/24
+   DBGvpp# set int state memif0/0 up
+
+   bazel-bin/examples/linux_amd64_stripped/icmp_responder_poll
+   gomemif# start
+
+   DBGvpp# ping 192.168.1.1
+
+To Run Bridge:
+
+::
+
+  bazel-bin/examples/linux_amd64_stripped/bridge
+  gomemif# start
+
+
+
diff --git a/extras/gomemif/WORKSPACE b/extras/gomemif/WORKSPACE
index 10741f5b7c0..d75bfa5a524 100644
--- a/extras/gomemif/WORKSPACE
+++ b/extras/gomemif/WORKSPACE
@@ -33,3 +33,8 @@ go_repository(
     importpath = "github.com/pkg/profile",
     commit = "acd64d450fd45fb2afa41f833f3788c8a7797219"
 )
+go_repository(
+    name = "com_github_gopacket",
+    importpath = "github.com/google/gopacket",
+    commit = "3eaba08943250fd212520e5cff00ed808b8fc60a"
+)
diff --git a/extras/gomemif/examples/BUILD.bazel b/extras/gomemif/examples/BUILD.bazel
index a88b92e37f1..eb10422027f 100644
--- a/extras/gomemif/examples/BUILD.bazel
+++ b/extras/gomemif/examples/BUILD.bazel
@@ -1,12 +1,14 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary")
 
 go_binary(
-    name = "responder",
-    srcs = ["responder.go"],
+    name = "icmp_responder_poll",
+    srcs = ["icmp_responder_poll.go"],
     visibility = ["//visibility:public",],
     deps = [
     	"//memif:memif",
         "@com_github_profile//:go_default_library",
+        "@com_github_gopacket//layers:go_default_library",
+        "@com_github_gopacket//:go_default_library"
     ],
 )
 
@@ -19,3 +21,16 @@ go_binary(
         "@com_github_profile//:go_default_library",
     ],
 )
+
+go_binary(
+    name = "icmp_responder_cb",
+    srcs = ["icmp_responder_cb.go"],
+    visibility = ["//visibility:public",],
+    deps = [
+    	"//memif:memif",
+        "@com_github_profile//:go_default_library",
+        "@com_github_gopacket//layers:go_default_library",
+        "@com_github_gopacket//:go_default_library"
+    ],
+)
+
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)
+}
diff --git a/extras/gomemif/examples/responder.go b/extras/gomemif/examples/icmp_responder_poll.go
index 8fda6435bc5..f9f1c3e8208 100644
--- a/extras/gomemif/examples/responder.go
+++ b/extras/gomemif/examples/icmp_responder_poll.go
@@ -21,12 +21,16 @@ import (
 	"bufio"
 	"flag"
 	"fmt"
+	"net"
 	"os"
 	"strings"
 	"sync"
 
-	"github.com/pkg/profile"
 	"memif"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/pkg/profile"
 )
 
 func Disconnected(i *memif.Interface) error {
@@ -78,8 +82,94 @@ func Connected(i *memif.Interface) error {
 				// read packet from shared memory
 				pktLen, err := rxq0.ReadPacket(pkt)
 				if pktLen > 0 {
-					// write packet to shared memory
-					txq0.WritePacket(pkt[:pktLen])
+					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())
+					}
 				} else if err != nil {
 					errChan <- err
 					return
diff --git a/extras/gomemif/memif/control_channel.go b/extras/gomemif/memif/control_channel.go
index 12672e6e2f8..4788fcb5ea5 100644
--- a/extras/gomemif/memif/control_channel.go
+++ b/extras/gomemif/memif/control_channel.go
@@ -67,11 +67,22 @@ type Socket struct {
 	interfaceList *list.List
 	ccList        *list.List
 	epfd          int
+	interruptfd   int
 	wakeEvent     syscall.EpollEvent
 	stopPollChan  chan struct{}
 	wg            sync.WaitGroup
 }
 
+type interrupt struct {
+	socket *Socket
+	event  syscall.EpollEvent
+}
+
+type memifInterrupt struct {
+	connection *Socket
+	qid        uint16
+}
+
 // StopPolling stops polling events on the socket
 func (socket *Socket) StopPolling() error {
 	if socket.stopPollChan != nil {
@@ -220,6 +231,15 @@ func (socket *Socket) handleEvent(event *syscall.EpollEvent) error {
 	if socket.listener != nil && socket.listener.event.Fd == event.Fd {
 		return socket.listener.handleEvent(event)
 	}
+	intf := socket.interfaceList.Back().Value.(*Interface)
+	if intf.args.InterruptFunc != nil {
+		if int(event.Fd) == int(intf.args.InterruptFd) {
+			b := make([]byte, 8)
+			syscall.Read(int(event.Fd), b)
+			intf.onInterrupt(intf)
+			return nil
+		}
+	}
 
 	for elt := socket.ccList.Front(); elt != nil; elt = elt.Next() {
 		cc, ok := elt.Value.(*controlChannel)
@@ -233,6 +253,25 @@ func (socket *Socket) handleEvent(event *syscall.EpollEvent) error {
 	return fmt.Errorf(errorFdNotFound)
 }
 
+func (socket *Socket) addInterrupt(fd int) (err error) {
+	l := &interrupt{
+		// we will need this to look up master interface by id
+		socket: socket,
+	}
+
+	l.event = syscall.EpollEvent{
+		Events: syscall.EPOLLIN,
+		Fd:     int32(fd),
+	}
+	err = socket.addEvent(&l.event)
+	if err != nil {
+		return fmt.Errorf("Failed to add event: ", err)
+	}
+
+	return nil
+
+}
+
 // handleEvent handles epoll event for listener
 func (l *listener) handleEvent(event *syscall.EpollEvent) error {
 	// hang up
@@ -725,7 +764,6 @@ func (cc *controlChannel) parseConnect() (err error) {
 	if err != nil {
 		return err
 	}
-
 	cc.isConnected = true
 
 	return nil
@@ -764,7 +802,6 @@ func (cc *controlChannel) parseConnected() (err error) {
 	if err != nil {
 		return err
 	}
-
 	cc.isConnected = true
 
 	return nil
diff --git a/extras/gomemif/memif/interface.go b/extras/gomemif/memif/interface.go
index 15a8e87453c..4a45075ea4f 100644
--- a/extras/gomemif/memif/interface.go
+++ b/extras/gomemif/memif/interface.go
@@ -60,6 +60,8 @@ type ConnectedFunc func(i *Interface) error
 // DisconnectedFunc is a callback called when an interface is disconnected
 type DisconnectedFunc func(i *Interface) error
 
+type InterruptFunc func(i *Interface) error
+
 // MemoryConfig represents shared memory configuration
 type MemoryConfig struct {
 	NumQueuePairs    uint16 // number of queue pairs
@@ -77,7 +79,9 @@ type Arguments struct {
 	MemoryConfig     MemoryConfig
 	ConnectedFunc    ConnectedFunc    // callback called when interface changes status to connected
 	DisconnectedFunc DisconnectedFunc // callback called when interface changes status to disconnected
-	PrivateData      interface{}      // private data used by client program
+	InterruptFunc    InterruptFunc
+	PrivateData      interface{} // private data used by client program
+	InterruptFd      uint16
 }
 
 // memoryRegion represents a shared memory mapped file
@@ -110,6 +114,7 @@ type Interface struct {
 	regions     []memoryRegion
 	txQueues    []Queue
 	rxQueues    []Queue
+	onInterrupt InterruptFunc
 }
 
 // IsMaster returns true if the interfaces role is master, else returns false
@@ -270,6 +275,10 @@ func RoleToString(isMaster bool) string {
 	return "Slave"
 }
 
+func memifPathIsAbstract(filename string) bool {
+	return (filename[0] == '@')
+}
+
 // RequestConnection is used by slave interface to connect to a socket and
 // create a control channel
 func (i *Interface) RequestConnection() error {
@@ -283,6 +292,9 @@ func (i *Interface) RequestConnection() error {
 	}
 	usa := &syscall.SockaddrUnix{Name: i.socket.filename}
 
+	if memifPathIsAbstract(i.socket.GetFilename()) {
+		usa.Name = "\000" + usa.Name[1:]
+	}
 	// Connect to listener socket
 	err = syscall.Connect(fd, usa)
 	if err != nil {
@@ -315,7 +327,8 @@ func (socket *Socket) NewInterface(args *Arguments) (*Interface, error) {
 
 	// copy interface configuration
 	i := Interface{
-		args: *args,
+		args:        *args,
+		onInterrupt: args.InterruptFunc,
 	}
 	// set default values
 	if i.args.MemoryConfig.NumQueuePairs == 0 {
@@ -434,6 +447,7 @@ func (i *Interface) initializeQueues() (err error) {
 		if err != nil {
 			return err
 		}
+		i.socket.addInterrupt(q.interruptFd)
 		q.putRing()
 		i.txQueues = append(i.txQueues, *q)
 
@@ -452,11 +466,17 @@ func (i *Interface) initializeQueues() (err error) {
 			i:        i,
 		}
 		q.ring.setCookie(cookie)
-		q.ring.setFlags(1)
+		if i.args.InterruptFunc == nil {
+			q.ring.setFlags(1)
+		} else {
+			q.ring.setFlags(0)
+		}
 		q.interruptFd, err = eventFd()
 		if err != nil {
 			return err
 		}
+		i.args.InterruptFd = uint16(q.interruptFd)
+		i.socket.addInterrupt(q.interruptFd)
 		q.putRing()
 		i.rxQueues = append(i.rxQueues, *q)