aboutsummaryrefslogtreecommitdiffstats
path: root/extras/gomemif/memif/control_channel.go
diff options
context:
space:
mode:
Diffstat (limited to 'extras/gomemif/memif/control_channel.go')
-rw-r--r--extras/gomemif/memif/control_channel.go1001
1 files changed, 0 insertions, 1001 deletions
diff --git a/extras/gomemif/memif/control_channel.go b/extras/gomemif/memif/control_channel.go
deleted file mode 100644
index 4788fcb5ea5..00000000000
--- a/extras/gomemif/memif/control_channel.go
+++ /dev/null
@@ -1,1001 +0,0 @@
-/*
- *------------------------------------------------------------------
- * 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 memif
-
-import (
- "bytes"
- "container/list"
- "encoding/binary"
- "fmt"
- "os"
- "sync"
- "syscall"
-)
-
-const maxEpollEvents = 1
-const maxControlLen = 256
-
-const errorFdNotFound = "fd not found"
-
-// controlMsg represents a message used in communication between memif peers
-type controlMsg struct {
- Buffer *bytes.Buffer
- Fd int
-}
-
-// listener represents a listener functionality of UNIX domain socket
-type listener struct {
- socket *Socket
- event syscall.EpollEvent
-}
-
-// controlChannel represents a communication channel between memif peers
-// backed by UNIX domain socket
-type controlChannel struct {
- listRef *list.Element
- socket *Socket
- i *Interface
- event syscall.EpollEvent
- data [msgSize]byte
- control [maxControlLen]byte
- controlLen int
- msgQueue []controlMsg
- isConnected bool
-}
-
-// Socket represents a UNIX domain socket used for communication
-// between memif peers
-type Socket struct {
- appName string
- filename string
- listener *listener
- 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 {
- // stop polling msg
- close(socket.stopPollChan)
- // wake epoll
- buf := make([]byte, 8)
- binary.PutUvarint(buf, 1)
- n, err := syscall.Write(int(socket.wakeEvent.Fd), buf[:])
- if err != nil {
- return err
- }
- if n != 8 {
- return fmt.Errorf("Faild to write to eventfd")
- }
- // wait until polling is stopped
- socket.wg.Wait()
- }
-
- return nil
-}
-
-// StartPolling starts polling and handling events on the socket,
-// enabling communication between memif peers
-func (socket *Socket) StartPolling(errChan chan<- error) {
- socket.stopPollChan = make(chan struct{})
- socket.wg.Add(1)
- go func() {
- var events [maxEpollEvents]syscall.EpollEvent
- defer socket.wg.Done()
-
- for {
- select {
- case <-socket.stopPollChan:
- return
- default:
- num, err := syscall.EpollWait(socket.epfd, events[:], -1)
- if err != nil {
- errChan <- fmt.Errorf("EpollWait: ", err)
- return
- }
-
- for ev := 0; ev < num; ev++ {
- if events[0].Fd == socket.wakeEvent.Fd {
- continue
- }
- err = socket.handleEvent(&events[0])
- if err != nil {
- errChan <- fmt.Errorf("handleEvent: ", err)
- }
- }
- }
- }
- }()
-}
-
-// addEvent adds event to epoll instance associated with the socket
-func (socket *Socket) addEvent(event *syscall.EpollEvent) error {
- err := syscall.EpollCtl(socket.epfd, syscall.EPOLL_CTL_ADD, int(event.Fd), event)
- if err != nil {
- return fmt.Errorf("EpollCtl: %s", err)
- }
- return nil
-}
-
-// addEvent deletes event to epoll instance associated with the socket
-func (socket *Socket) delEvent(event *syscall.EpollEvent) error {
- err := syscall.EpollCtl(socket.epfd, syscall.EPOLL_CTL_DEL, int(event.Fd), event)
- if err != nil {
- return fmt.Errorf("EpollCtl: %s", err)
- }
- return nil
-}
-
-// Delete deletes the socket
-func (socket *Socket) Delete() (err error) {
- for elt := socket.ccList.Front(); elt != nil; elt = elt.Next() {
- cc, ok := elt.Value.(*controlChannel)
- if ok {
- err = cc.close(true, "Socket deleted")
- if err != nil {
- return nil
- }
- }
- }
- for elt := socket.interfaceList.Front(); elt != nil; elt = elt.Next() {
- i, ok := elt.Value.(*Interface)
- if ok {
- err = i.Delete()
- if err != nil {
- return err
- }
- }
- }
-
- if socket.listener != nil {
- err = socket.listener.close()
- if err != nil {
- return err
- }
- err = os.Remove(socket.filename)
- if err != nil {
- return nil
- }
- }
-
- err = socket.delEvent(&socket.wakeEvent)
- if err != nil {
- return fmt.Errorf("Failed to delete event: ", err)
- }
-
- syscall.Close(socket.epfd)
-
- return nil
-}
-
-// NewSocket returns a new Socket
-func NewSocket(appName string, filename string) (socket *Socket, err error) {
- socket = &Socket{
- appName: appName,
- filename: filename,
- interfaceList: list.New(),
- ccList: list.New(),
- }
- if socket.filename == "" {
- socket.filename = DefaultSocketFilename
- }
-
- socket.epfd, _ = syscall.EpollCreate1(0)
-
- efd, err := eventFd()
- socket.wakeEvent = syscall.EpollEvent{
- Events: syscall.EPOLLIN | syscall.EPOLLERR | syscall.EPOLLHUP,
- Fd: int32(efd),
- }
- err = socket.addEvent(&socket.wakeEvent)
- if err != nil {
- return nil, fmt.Errorf("Failed to add event: ", err)
- }
-
- return socket, nil
-}
-
-// handleEvent handles epoll event
-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)
- if ok {
- if cc.event.Fd == event.Fd {
- return cc.handleEvent(event)
- }
- }
- }
-
- 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
- if (event.Events & syscall.EPOLLHUP) == syscall.EPOLLHUP {
- err := l.close()
- if err != nil {
- return fmt.Errorf("Failed to close listener after hang up event: ", err)
- }
- return fmt.Errorf("Hang up: ", l.socket.filename)
- }
-
- // error
- if (event.Events & syscall.EPOLLERR) == syscall.EPOLLERR {
- err := l.close()
- if err != nil {
- return fmt.Errorf("Failed to close listener after receiving an error event: ", err)
- }
- return fmt.Errorf("Received error event on listener ", l.socket.filename)
- }
-
- // read message
- if (event.Events & syscall.EPOLLIN) == syscall.EPOLLIN {
- newFd, _, err := syscall.Accept(int(l.event.Fd))
- if err != nil {
- return fmt.Errorf("Accept: %s", err)
- }
-
- cc, err := l.socket.addControlChannel(newFd, nil)
- if err != nil {
- return fmt.Errorf("Failed to add control channel: %s", err)
- }
-
- err = cc.msgEnqHello()
- if err != nil {
- return fmt.Errorf("msgEnqHello: %s", err)
- }
-
- err = cc.sendMsg()
- if err != nil {
- return err
- }
-
- return nil
- }
-
- return fmt.Errorf("Unexpected event: ", event.Events)
-}
-
-// handleEvent handles epoll event for control channel
-func (cc *controlChannel) handleEvent(event *syscall.EpollEvent) error {
- var size int
- var err error
-
- // hang up
- if (event.Events & syscall.EPOLLHUP) == syscall.EPOLLHUP {
- // close cc, don't send msg
- err := cc.close(false, "")
- if err != nil {
- return fmt.Errorf("Failed to close control channel after hang up event: ", err)
- }
- return fmt.Errorf("Hang up: ", cc.i.GetName())
- }
-
- if (event.Events & syscall.EPOLLERR) == syscall.EPOLLERR {
- // close cc, don't send msg
- err := cc.close(false, "")
- if err != nil {
- return fmt.Errorf("Failed to close control channel after receiving an error event: ", err)
- }
- return fmt.Errorf("Received error event on control channel ", cc.i.GetName())
- }
-
- if (event.Events & syscall.EPOLLIN) == syscall.EPOLLIN {
- size, cc.controlLen, _, _, err = syscall.Recvmsg(int(cc.event.Fd), cc.data[:], cc.control[:], 0)
- if err != nil {
- return fmt.Errorf("recvmsg: %s", err)
- }
- if size != msgSize {
- return fmt.Errorf("invalid message size %d", size)
- }
-
- err = cc.parseMsg()
- if err != nil {
- return err
- }
-
- err = cc.sendMsg()
- if err != nil {
- return err
- }
-
- return nil
- }
-
- return fmt.Errorf("Unexpected event: ", event.Events)
-}
-
-// close closes the listener
-func (l *listener) close() error {
- err := l.socket.delEvent(&l.event)
- if err != nil {
- return fmt.Errorf("Failed to del event: ", err)
- }
- err = syscall.Close(int(l.event.Fd))
- if err != nil {
- return fmt.Errorf("Failed to close socket: ", err)
- }
- return nil
-}
-
-// AddListener adds a lisntener to the socket. The fd must describe a
-// UNIX domain socket already bound to a UNIX domain filename and
-// marked as listener
-func (socket *Socket) AddListener(fd int) (err error) {
- l := &listener{
- // we will need this to look up master interface by id
- socket: socket,
- }
-
- l.event = syscall.EpollEvent{
- Events: syscall.EPOLLIN | syscall.EPOLLERR | syscall.EPOLLHUP,
- Fd: int32(fd),
- }
- err = socket.addEvent(&l.event)
- if err != nil {
- return fmt.Errorf("Failed to add event: ", err)
- }
-
- socket.listener = l
-
- return nil
-}
-
-// addListener creates new UNIX domain socket, binds it to the address
-// and marks it as listener
-func (socket *Socket) addListener() (err error) {
- // create socket
- fd, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_SEQPACKET, 0)
- if err != nil {
- return fmt.Errorf("Failed to create UNIX domain socket")
- }
- usa := &syscall.SockaddrUnix{Name: socket.filename}
- // Bind to address and start listening
- err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
- if err != nil {
- return fmt.Errorf("Failed to set socket option %s : %v", socket.filename, err)
- }
- err = syscall.Bind(fd, usa)
- if err != nil {
- return fmt.Errorf("Failed to bind socket %s : %v", socket.filename, err)
- }
- err = syscall.Listen(fd, syscall.SOMAXCONN)
- if err != nil {
- return fmt.Errorf("Failed to listen on socket %s : %v", socket.filename, err)
- }
-
- return socket.AddListener(fd)
-}
-
-// close closes a control channel, if the control channel is assigned an
-// interface, the interface is disconnected
-func (cc *controlChannel) close(sendMsg bool, str string) (err error) {
- if sendMsg == true {
- // first clear message queue so that the disconnect
- // message is the only message in queue
- cc.msgQueue = []controlMsg{}
- cc.msgEnqDisconnect(str)
-
- err = cc.sendMsg()
- if err != nil {
- return err
- }
- }
-
- err = cc.socket.delEvent(&cc.event)
- if err != nil {
- return fmt.Errorf("Failed to del event: ", err)
- }
-
- // remove referance form socket
- cc.socket.ccList.Remove(cc.listRef)
-
- if cc.i != nil {
- err = cc.i.disconnect()
- if err != nil {
- return fmt.Errorf("Interface Disconnect: ", err)
- }
- }
-
- return nil
-}
-
-//addControlChannel returns a new controlChannel and adds it to the socket
-func (socket *Socket) addControlChannel(fd int, i *Interface) (*controlChannel, error) {
- cc := &controlChannel{
- socket: socket,
- i: i,
- isConnected: false,
- }
-
- var err error
-
- cc.event = syscall.EpollEvent{
- Events: syscall.EPOLLIN | syscall.EPOLLERR | syscall.EPOLLHUP,
- Fd: int32(fd),
- }
- err = socket.addEvent(&cc.event)
- if err != nil {
- return nil, fmt.Errorf("Failed to add event: ", err)
- }
-
- cc.listRef = socket.ccList.PushBack(cc)
-
- return cc, nil
-}
-
-func (cc *controlChannel) msgEnqAck() (err error) {
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeAck)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqHello() (err error) {
- hello := MsgHello{
- VersionMin: Version,
- VersionMax: Version,
- MaxRegion: 255,
- MaxRingM2S: 255,
- MaxRingS2M: 255,
- MaxLog2RingSize: 14,
- }
-
- copy(hello.Name[:], []byte(cc.socket.appName))
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeHello)
- err = binary.Write(buf, binary.LittleEndian, hello)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseHello() (err error) {
- var hello MsgHello
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &hello)
- if err != nil {
- return
- }
-
- if hello.VersionMin > Version || hello.VersionMax < Version {
- return fmt.Errorf("Incompatible memif version")
- }
-
- cc.i.run = cc.i.args.MemoryConfig
-
- cc.i.run.NumQueuePairs = min16(cc.i.args.MemoryConfig.NumQueuePairs, hello.MaxRingS2M)
- cc.i.run.NumQueuePairs = min16(cc.i.args.MemoryConfig.NumQueuePairs, hello.MaxRingM2S)
- cc.i.run.Log2RingSize = min8(cc.i.args.MemoryConfig.Log2RingSize, hello.MaxLog2RingSize)
-
- cc.i.remoteName = string(hello.Name[:])
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqInit() (err error) {
- init := MsgInit{
- Version: Version,
- Id: cc.i.args.Id,
- Mode: cc.i.args.Mode,
- }
-
- copy(init.Name[:], []byte(cc.socket.appName))
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeInit)
- err = binary.Write(buf, binary.LittleEndian, init)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseInit() (err error) {
- var init MsgInit
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &init)
- if err != nil {
- return
- }
-
- if init.Version != Version {
- return fmt.Errorf("Incompatible memif driver version")
- }
-
- // find peer interface
- for elt := cc.socket.interfaceList.Front(); elt != nil; elt = elt.Next() {
- i, ok := elt.Value.(*Interface)
- if ok {
- if i.args.Id == init.Id && i.args.IsMaster && i.cc == nil {
- // verify secret
- if i.args.Secret != init.Secret {
- return fmt.Errorf("Invalid secret")
- }
- // interface is assigned to control channel
- i.cc = cc
- cc.i = i
- cc.i.run = cc.i.args.MemoryConfig
- cc.i.remoteName = string(init.Name[:])
-
- return nil
- }
- }
- }
-
- return fmt.Errorf("Invalid interface id")
-}
-
-func (cc *controlChannel) msgEnqAddRegion(regionIndex uint16) (err error) {
- if len(cc.i.regions) <= int(regionIndex) {
- return fmt.Errorf("Invalid region index")
- }
-
- addRegion := MsgAddRegion{
- Index: regionIndex,
- Size: cc.i.regions[regionIndex].size,
- }
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeAddRegion)
- err = binary.Write(buf, binary.LittleEndian, addRegion)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: cc.i.regions[regionIndex].fd,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseAddRegion() (err error) {
- var addRegion MsgAddRegion
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &addRegion)
- if err != nil {
- return
- }
-
- fd, err := cc.parseControlMsg()
- if err != nil {
- return fmt.Errorf("parseControlMsg: %s", err)
- }
-
- if addRegion.Index > 255 {
- return fmt.Errorf("Invalid memory region index")
- }
-
- region := memoryRegion{
- size: addRegion.Size,
- fd: fd,
- }
-
- cc.i.regions = append(cc.i.regions, region)
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqAddRing(ringType ringType, ringIndex uint16) (err error) {
- var q Queue
- var flags uint16 = 0
-
- if ringType == ringTypeS2M {
- q = cc.i.txQueues[ringIndex]
- flags = msgAddRingFlagS2M
- } else {
- q = cc.i.rxQueues[ringIndex]
- }
-
- addRing := MsgAddRing{
- Index: ringIndex,
- Offset: uint32(q.ring.offset),
- Region: uint16(q.ring.region),
- RingSizeLog2: uint8(q.ring.log2Size),
- Flags: flags,
- PrivateHdrSize: 0,
- }
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeAddRing)
- err = binary.Write(buf, binary.LittleEndian, addRing)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: q.interruptFd,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseAddRing() (err error) {
- var addRing MsgAddRing
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &addRing)
- if err != nil {
- return
- }
-
- fd, err := cc.parseControlMsg()
- if err != nil {
- return err
- }
-
- if addRing.Index >= cc.i.run.NumQueuePairs {
- return fmt.Errorf("invalid ring index")
- }
-
- q := Queue{
- i: cc.i,
- interruptFd: fd,
- }
-
- if (addRing.Flags & msgAddRingFlagS2M) == msgAddRingFlagS2M {
- q.ring = newRing(int(addRing.Region), ringTypeS2M, int(addRing.Offset), int(addRing.RingSizeLog2))
- cc.i.rxQueues = append(cc.i.rxQueues, q)
- } else {
- q.ring = newRing(int(addRing.Region), ringTypeM2S, int(addRing.Offset), int(addRing.RingSizeLog2))
- cc.i.txQueues = append(cc.i.txQueues, q)
- }
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqConnect() (err error) {
- var connect MsgConnect
- copy(connect.Name[:], []byte(cc.i.args.Name))
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeConnect)
- err = binary.Write(buf, binary.LittleEndian, connect)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseConnect() (err error) {
- var connect MsgConnect
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &connect)
- if err != nil {
- return
- }
-
- cc.i.peerName = string(connect.Name[:])
-
- err = cc.i.connect()
- if err != nil {
- return err
- }
- cc.isConnected = true
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqConnected() (err error) {
- var connected MsgConnected
- copy(connected.Name[:], []byte(cc.i.args.Name))
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeConnected)
- err = binary.Write(buf, binary.LittleEndian, connected)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseConnected() (err error) {
- var conn MsgConnected
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &conn)
- if err != nil {
- return
- }
-
- cc.i.peerName = string(conn.Name[:])
-
- err = cc.i.connect()
- if err != nil {
- return err
- }
- cc.isConnected = true
-
- return nil
-}
-
-func (cc *controlChannel) msgEnqDisconnect(str string) (err error) {
- dc := MsgDisconnect{
- // not implemented
- Code: 0,
- }
- copy(dc.String[:], str)
-
- buf := new(bytes.Buffer)
- err = binary.Write(buf, binary.LittleEndian, msgTypeDisconnect)
- err = binary.Write(buf, binary.LittleEndian, dc)
-
- msg := controlMsg{
- Buffer: buf,
- Fd: -1,
- }
-
- cc.msgQueue = append(cc.msgQueue, msg)
-
- return nil
-}
-
-func (cc *controlChannel) parseDisconnect() (err error) {
- var dc MsgDisconnect
-
- buf := bytes.NewReader(cc.data[msgTypeSize:])
- err = binary.Read(buf, binary.LittleEndian, &dc)
- if err != nil {
- return
- }
-
- err = cc.close(false, string(dc.String[:]))
- if err != nil {
- return fmt.Errorf("Failed to disconnect control channel: ", err)
- }
-
- return nil
-}
-
-func (cc *controlChannel) parseMsg() error {
- var msgType msgType
- var err error
-
- buf := bytes.NewReader(cc.data[:])
- err = binary.Read(buf, binary.LittleEndian, &msgType)
-
- if msgType == msgTypeAck {
- return nil
- } else if msgType == msgTypeHello {
- // Configure
- err = cc.parseHello()
- if err != nil {
- goto error
- }
- // Initialize slave memif
- err = cc.i.initializeRegions()
- if err != nil {
- goto error
- }
- err = cc.i.initializeQueues()
- if err != nil {
- goto error
- }
- // Enqueue messages
- err = cc.msgEnqInit()
- if err != nil {
- goto error
- }
- for i := 0; i < len(cc.i.regions); i++ {
- err = cc.msgEnqAddRegion(uint16(i))
- if err != nil {
- goto error
- }
- }
- for i := 0; uint16(i) < cc.i.run.NumQueuePairs; i++ {
- err = cc.msgEnqAddRing(ringTypeS2M, uint16(i))
- if err != nil {
- goto error
- }
- }
- for i := 0; uint16(i) < cc.i.run.NumQueuePairs; i++ {
- err = cc.msgEnqAddRing(ringTypeM2S, uint16(i))
- if err != nil {
- goto error
- }
- }
- err = cc.msgEnqConnect()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeInit {
- err = cc.parseInit()
- if err != nil {
- goto error
- }
-
- err = cc.msgEnqAck()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeAddRegion {
- err = cc.parseAddRegion()
- if err != nil {
- goto error
- }
-
- err = cc.msgEnqAck()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeAddRing {
- err = cc.parseAddRing()
- if err != nil {
- goto error
- }
-
- err = cc.msgEnqAck()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeConnect {
- err = cc.parseConnect()
- if err != nil {
- goto error
- }
-
- err = cc.msgEnqConnected()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeConnected {
- err = cc.parseConnected()
- if err != nil {
- goto error
- }
- } else if msgType == msgTypeDisconnect {
- err = cc.parseDisconnect()
- if err != nil {
- goto error
- }
- } else {
- err = fmt.Errorf("unknown message %d", msgType)
- goto error
- }
-
- return nil
-
-error:
- err1 := cc.close(true, err.Error())
- if err1 != nil {
- return fmt.Errorf(err.Error(), ": Failed to close control channel: ", err1)
- }
-
- return err
-}
-
-// parseControlMsg parses control message and returns file descriptor
-// if any
-func (cc *controlChannel) parseControlMsg() (fd int, err error) {
- // Assert only called when we require FD
- fd = -1
-
- controlMsgs, err := syscall.ParseSocketControlMessage(cc.control[:cc.controlLen])
- if err != nil {
- return -1, fmt.Errorf("syscall.ParseSocketControlMessage: %s", err)
- }
-
- if len(controlMsgs) == 0 {
- return -1, fmt.Errorf("Missing control message")
- }
-
- for _, cmsg := range controlMsgs {
- if cmsg.Header.Level == syscall.SOL_SOCKET {
- if cmsg.Header.Type == syscall.SCM_RIGHTS {
- FDs, err := syscall.ParseUnixRights(&cmsg)
- if err != nil {
- return -1, fmt.Errorf("syscall.ParseUnixRights: %s", err)
- }
- if len(FDs) == 0 {
- continue
- }
- // Only expect single FD
- fd = FDs[0]
- }
- }
- }
-
- if fd == -1 {
- return -1, fmt.Errorf("Missing file descriptor")
- }
-
- return fd, nil
-}