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date: 2016-09-11/21:30

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This commit is contained in:
Lei Xue
2016-09-11 21:35:17 +08:00
parent 11aad6c253
commit 3fc1973593
4 changed files with 172 additions and 32 deletions
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38
pkg/port/iscsit/cmd.go
View File

@@ -90,6 +90,10 @@ type ISCSICommand struct {
Status byte
SCSIResponse byte
// R2T
R2TSN uint32
DesiredLength uint32
// Data-In/Out
HasStatus bool
DataSN uint32
@@ -112,6 +116,8 @@ func (cmd *ISCSICommand) Bytes() []byte {
return cmd.noopInBytes()
case OpSCSITaskResp:
return cmd.scsiTMFRespBytes()
case OpReady:
return cmd.r2tRespBytes()
}
return nil
}
@@ -139,7 +145,7 @@ func (m *ISCSICommand) String() string {
s = append(s, fmt.Sprintf("Next Stage = %v", m.NSG))
s = append(s, fmt.Sprintf("Status Class = %d", m.StatusClass))
s = append(s, fmt.Sprintf("Status Detail = %d", m.StatusDetail))
case OpSCSICmd:
case OpSCSICmd, OpSCSIOut:
s = append(s, fmt.Sprintf("LUN = %d", m.LUN))
s = append(s, fmt.Sprintf("ExpectedDataLen = %d", m.ExpectedDataLen))
s = append(s, fmt.Sprintf("CmdSN = %d", m.CmdSN))
@@ -397,3 +403,33 @@ func (m *ISCSICommand) scsiTMFRespBytes() []byte {
return buf.Bytes()
}
func (m *ISCSICommand) r2tRespBytes() []byte {
// rfc7143 11.8
buf := &bytes.Buffer{}
buf.WriteByte(byte(OpReady))
var b byte
if m.Final {
b |= 0x80
}
buf.WriteByte(b)
buf.WriteByte(0x00)
buf.WriteByte(0x00)
// Skip through to byte 16
for i := 0; i < 3*4; i++ {
buf.WriteByte(0x00)
}
buf.Write(util.MarshalUint64(uint64(m.TaskTag))[4:])
for i := 0; i < 4; i++ {
buf.WriteByte(0x00)
}
buf.Write(util.MarshalUint64(uint64(m.StatSN))[4:])
buf.Write(util.MarshalUint64(uint64(m.ExpCmdSN))[4:])
buf.Write(util.MarshalUint64(uint64(m.MaxCmdSN))[4:])
buf.Write(util.MarshalUint64(uint64(m.R2TSN))[4:])
buf.Write(util.MarshalUint64(uint64(m.BufferOffset))[4:])
buf.Write(util.MarshalUint64(uint64(m.DesiredLength))[4:])
return buf.Bytes()
}

11
pkg/port/iscsit/conn.go
View File

@@ -89,8 +89,8 @@ type iscsiConnection struct {
type taskState int
const (
taskPending taskState = 1
taskSCSI taskState = 2
taskPending taskState = 0
taskSCSI taskState = 1
)
type iscsiTask struct {
@@ -99,6 +99,13 @@ type iscsiTask struct {
cmd *ISCSICommand
scmd *api.SCSICommand
state taskState
offset int
r2tCount int
unsolCount int
expR2TSN int
r2tSN uint32
}
func (c *iscsiConnection) init() {

153
pkg/port/iscsit/iscsid.go
View File

@@ -21,6 +21,7 @@ import (
"fmt"
"net"
"os"
"runtime/debug"
"github.com/golang/glog"
"github.com/gostor/gotgt/pkg/api"
@@ -90,15 +91,15 @@ func (s *ISCSITargetService) Run() error {
func (s *ISCSITargetService) handler(events byte, conn *iscsiConnection) {
if events&DATAIN != 0 {
glog.Infof("rx handler processing...")
glog.V(1).Infof("rx handler processing...")
go s.rxHandler(conn)
}
if conn.state != CONN_STATE_CLOSE && events&DATAOUT != 0 {
glog.Infof("tx handler processing...")
glog.V(1).Infof("tx handler processing...")
s.txHandler(conn)
}
if conn.state == CONN_STATE_CLOSE {
glog.Infof("iscsi connection[%d] closed", conn.cid)
glog.Warningf("iscsi connection[%d] closed", conn.cid)
conn.close()
}
}
@@ -160,10 +161,16 @@ func (s *ISCSITargetService) rxHandler(conn *iscsiConnection) {
return
}
dl := ((cmd.DataLen + DataPadding - 1) / DataPadding) * DataPadding
buf, length, err := conn.readData(dl)
if err != nil {
glog.Error(err)
return
buf := []byte{}
length := 0
for length < dl {
b, l, err := conn.readData(dl - length)
if err != nil {
glog.Error(err)
return
}
length += l
buf = append(buf, b...)
}
if length != dl {
glog.V(2).Infof("get length is %d, but expected %d", length, dl)
@@ -213,8 +220,8 @@ func (s *ISCSITargetService) rxHandler(conn *iscsiConnection) {
default:
iscsiExecReject(conn)
}
glog.V(1).Infof("connection state is %v", conn.state)
glog.Infof("%#v", conn.resp.String())
glog.V(2).Infof("connection state is %v", conn.state)
glog.V(2).Infof("%#v", conn.resp.String())
s.handler(DATAOUT, conn)
}
}
@@ -325,7 +332,8 @@ func (s *ISCSITargetService) iscsiExecText(conn *iscsiConnection) error {
}
for _, t := range list {
result = append(result, util.KeyValue{"TargetName", t.Name})
result = append(result, util.KeyValue{"TargetAddress", "127.0.0.1:3260,1"})
result = append(result, util.KeyValue{"TargetAddress", "172.16.69.169:3260,1"})
//result = append(result, util.KeyValue{"TargetAddress", "127.0.0.1:3260,1"})
}
}
}
@@ -403,7 +411,9 @@ func (s *ISCSITargetService) txHandler(conn *iscsiConnection) {
glog.V(2).Infof("length of RawData is %d", len(conn.resp.RawData))
glog.V(2).Infof("length of resp is %d", len(conn.resp.Bytes()))
if l, err := conn.write(conn.resp.Bytes()); err != nil {
debug.PrintStack()
glog.Error(err)
panic(err)
return
} else {
conn.txIOState = IOSTATE_TX_INIT_AHS
@@ -435,30 +445,30 @@ func (s *ISCSITargetService) txHandler(conn *iscsiConnection) {
}
}
glog.Infof("connection state: %d", conn.state)
glog.V(3).Infof("connection state: %d", conn.state)
switch conn.state {
case CONN_STATE_CLOSE, CONN_STATE_EXIT:
glog.Warningf("set connection to close")
conn.state = CONN_STATE_CLOSE
case CONN_STATE_SECURITY_LOGIN:
conn.state = CONN_STATE_LOGIN
glog.Infof("CONN_STATE_LOGIN")
glog.V(3).Infof("CONN_STATE_LOGIN")
case CONN_STATE_SECURITY_FULL, CONN_STATE_LOGIN_FULL:
if conn.sessionType == SESSION_NORMAL {
conn.state = CONN_STATE_KERNEL
glog.Infof("CONN_STATE_KERNEL")
conn.state = CONN_STATE_SCSI
glog.Infof("CONN_STATE_SCSI")
glog.V(3).Infof("CONN_STATE_SCSI")
} else {
conn.state = CONN_STATE_FULL
glog.Infof("CONN_STATE_FULL")
glog.V(3).Infof("CONN_STATE_FULL")
}
conn.rxIOState = IOSTATE_RX_BHS
s.handler(DATAIN, conn)
case CONN_STATE_SCSI:
conn.txTask = nil
default:
glog.Infof("unexpected connection state: %d", conn.state)
glog.Warningf("unexpected connection state: %d", conn.state)
conn.rxIOState = IOSTATE_RX_BHS
s.handler(DATAIN, conn)
}
@@ -469,9 +479,49 @@ func (s *ISCSITargetService) scsiCommandHandler(conn *iscsiConnection) (err erro
req := conn.req
switch req.OpCode {
case OpSCSICmd:
glog.Infof("SCSI Command processing...")
glog.V(2).Infof("SCSI Command processing...")
scmd := &api.SCSICommand{}
task := &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: scmd}
if req.Write {
task.offset = req.DataLen
task.r2tCount = int(req.ExpectedDataLen) - req.DataLen
if !req.Final {
task.unsolCount = 1
}
glog.V(2).Infof("SCSI write, R2T count: %d, unsol Count: %d, offset: %d", task.r2tCount, task.unsolCount, task.offset)
if task.scmd.OutSDBBuffer.Buffer == nil {
task.scmd.OutSDBBuffer.Buffer = bytes.NewBuffer([]byte{})
}
task.scmd.OutSDBBuffer.Buffer.Write(conn.req.RawData)
if task.r2tCount > 0 {
// prepare to receive more data
task.state = taskPending
conn.session.PendingTasks.Push(task)
//conn.rxTask = nil
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: &api.SCSICommand{}}
conn.txIOState = IOSTATE_TX_BHS
conn.statSN += 1
resp := &ISCSICommand{
OpCode: OpReady,
Immediate: true,
Final: true,
StatSN: req.ExpStatSN,
TaskTag: req.TaskTag,
ExpCmdSN: conn.session.ExpCmdSN,
MaxCmdSN: conn.session.ExpCmdSN + 10,
R2TSN: task.r2tSN,
BufferOffset: uint32(task.offset),
DesiredLength: uint32(task.r2tCount),
}
if val := sessionKeys[ISCSI_PARAM_MAX_BURST].def; task.r2tCount > int(val) {
resp.DesiredLength = uint32(val)
}
conn.resp = resp
break
}
}
task.offset = 0
conn.rxTask = task
if err = s.iscsiTaskQueueHandler(task); err != nil {
return
@@ -516,31 +566,76 @@ func (s *ISCSITargetService) scsiCommandHandler(conn *iscsiConnection) (err erro
}
case OpSCSITaskReq:
// task management function
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag}
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, state: taskPending}
conn.txIOState = IOSTATE_TX_BHS
iscsiExecTMFunction(conn)
case OpSCSIOut:
glog.Infof("scsi out operation")
scmd := &api.SCSICommand{}
conn.req.Write = true
conn.req.CDB = []byte{api.Write_10}
task := &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: scmd}
glog.V(1).Infof("iSCSI Data-out processing...")
var task *iscsiTask
for _, t := range conn.session.PendingTasks {
if t.tag == conn.req.TaskTag {
task = t
}
}
if task == nil {
err = fmt.Errorf("Cannot find iSCSI task with tag[%v]", conn.req.TaskTag)
glog.Error(err)
return
}
task.offset = task.offset + conn.req.DataLen
task.r2tCount = task.r2tCount - conn.req.DataLen
task.scmd.OutSDBBuffer.Buffer.Write(conn.req.RawData)
glog.V(2).Infof("Final: %v", conn.req.Final)
glog.V(2).Infof("r2tCount: %v", task.r2tCount)
if !conn.req.Final {
glog.V(1).Infof("Not ready to exec the task")
conn.rxIOState = IOSTATE_RX_BHS
s.handler(DATAIN, conn)
return nil
} else if task.r2tCount > 0 {
// prepare to receive more data
conn.rxTask = nil
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: &api.SCSICommand{}}
conn.txIOState = IOSTATE_TX_BHS
conn.statSN += 1
task.r2tSN += 1
resp := &ISCSICommand{
OpCode: OpReady,
Immediate: true,
Final: true,
StatSN: req.ExpStatSN,
TaskTag: req.TaskTag,
ExpCmdSN: conn.session.ExpCmdSN,
MaxCmdSN: conn.session.ExpCmdSN + 10,
R2TSN: task.r2tSN,
BufferOffset: uint32(task.offset),
DesiredLength: uint32(task.r2tCount),
}
if val := sessionKeys[ISCSI_PARAM_MAX_BURST].def; task.r2tCount > int(val) {
resp.DesiredLength = uint32(val)
}
conn.resp = resp
break
}
task.offset = 0
glog.V(1).Infof("Process the Data-out package")
conn.rxTask = task
if err = s.iscsiExecTask(task); err != nil {
return
} else {
conn.rxTask = nil
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: &api.SCSICommand{}}
conn.txTask = &iscsiTask{conn: conn, cmd: conn.req, tag: conn.req.TaskTag, scmd: &api.SCSICommand{}, state: taskSCSI}
conn.txIOState = IOSTATE_TX_BHS
conn.statSN += 1
resp := &ISCSICommand{
OpCode: OpSCSIResp,
Immediate: true,
Final: true,
StatSN: req.ExpStatSN,
TaskTag: req.TaskTag,
ExpCmdSN: conn.session.ExpCmdSN,
MaxCmdSN: conn.session.ExpCmdSN + 10,
Status: scmd.Result,
Status: 0,
SCSIResponse: 0x00,
HasStatus: true,
}
@@ -581,9 +676,9 @@ func (s *ISCSITargetService) iscsiTaskQueueHandler(task *iscsiTask) error {
retry:
cmdsn += 1
sess.ExpCmdSN = cmdsn
glog.Infof("session's ExpCmdSN is %d", cmdsn)
glog.V(2).Infof("session's ExpCmdSN is %d", cmdsn)
glog.Infof("process task(%d)", task.cmd.CmdSN)
glog.V(2).Infof("process task(%d)", task.cmd.CmdSN)
if err := s.iscsiExecTask(task); err != nil {
glog.Error(err)
}
@@ -604,7 +699,7 @@ func (s *ISCSITargetService) iscsiTaskQueueHandler(task *iscsiTask) error {
glog.Error(err)
return err
}
glog.Infof("add task(%d) into task queue", task.cmd.CmdSN)
glog.V(1).Infof("add task(%d) into task queue", task.cmd.CmdSN)
// add this connection into queue and set this task as pending task
task.state = taskPending
sess.PendingTasks.Push(task)
@@ -634,7 +729,9 @@ func (s *ISCSITargetService) iscsiExecTask(task *iscsiTask) error {
task.scmd.Lun = cmd.LUN
task.scmd.Tag = uint64(cmd.TaskTag)
task.state = taskSCSI
task.scmd.OutSDBBuffer.Buffer = bytes.NewBuffer(cmd.RawData)
if task.scmd.OutSDBBuffer.Buffer == nil {
task.scmd.OutSDBBuffer.Buffer = bytes.NewBuffer(cmd.RawData)
}
// add scsi target process queue
err := s.SCSI.AddCommandQueue(task.conn.session.Target.SCSITarget.TID, task.scmd)
if err != nil {