166 lines
3.5 KiB
Go
166 lines
3.5 KiB
Go
/*
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Copyright 2016 The GoStor Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// iSCSI Target Driver
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package iscsit
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import (
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"fmt"
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"strings"
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"sync"
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"github.com/gostor/gotgt/pkg/api"
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)
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const iSCSIDriverName = "iscsi"
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const (
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IOSTATE_FREE = iota
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IOSTATE_RX_BHS
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IOSTATE_RX_INIT_AHS
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IOSTATE_RX_AHS
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IOSTATE_RX_INIT_HDIGEST
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IOSTATE_RX_HDIGEST
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IOSTATE_RX_CHECK_HDIGEST
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IOSTATE_RX_INIT_DATA
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IOSTATE_RX_DATA
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IOSTATE_RX_INIT_DDIGEST
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IOSTATE_RX_DDIGEST
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IOSTATE_RX_CHECK_DDIGEST
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IOSTATE_RX_END
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IOSTATE_TX_BHS
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IOSTATE_TX_INIT_AHS
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IOSTATE_TX_AHS
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IOSTATE_TX_INIT_HDIGEST
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IOSTATE_TX_HDIGEST
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IOSTATE_TX_INIT_DATA
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IOSTATE_TX_DATA
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IOSTATE_TX_INIT_DDIGEST
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IOSTATE_TX_DDIGEST
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IOSTATE_TX_END
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)
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var ISCSI_OPCODE_MASK byte = 0x3F
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type ISCSIDiscoveryMethod string
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var (
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ISCSIDiscoverySendTargets ISCSIDiscoveryMethod = "sendtargets"
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ISCSIDiscoveryStaticConfig ISCSIDiscoveryMethod = "static"
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ISCSIDiscoveryISNS ISCSIDiscoveryMethod = "isns"
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)
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type ISCSIRedirectInfo struct {
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Address string
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Port int
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Reason uint8
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Callback string
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}
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type iSCSITPGT struct {
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// Mapping to SCSI Reltive Target Port ID
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TPGT uint16
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Portals map[string]struct{}
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}
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type ISCSITarget struct {
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*api.SCSITarget
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api.SCSITargetDriverCommon
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// TPGT number is the key
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TPGTs map[uint16]*iSCSITPGT
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// TSIH is the key
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Sessions map[uint16]*ISCSISession
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SessionsRWMutex sync.RWMutex
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Alias string
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MaxSessions int
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RedirectInfo ISCSIRedirectInfo
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Rdma int
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NopInterval int
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NopCount int
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}
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/*
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* RFC 3720 iSCSI SSID = ISID , TPGT
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* ISID is an 6 bytes number, TPGT is an 2 bytes number
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* We combine ISID and TPGT together to be SSID
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*/
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func MakeSSID(ISID uint64, TPGT uint16) uint64 {
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SSID := ISID<<16 | uint64(TPGT)
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return SSID
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}
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func ParseSSID(SSID uint64) (uint64, uint16) {
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TPGT := uint16(uint64(0xFFFF) & SSID)
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ISID := SSID >> 16
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return ISID, TPGT
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}
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func (tgt *ISCSITarget) FindTPG(portal string) (uint16, error) {
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for tpgt, TPG := range tgt.TPGTs {
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for tgtPortal := range TPG.Portals {
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if strings.EqualFold(portal, tgtPortal) {
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return tpgt, nil
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}
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}
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}
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return 0, fmt.Errorf("No TPGT found with IP(%s)", portal)
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}
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func newISCSITarget(target *api.SCSITarget) *ISCSITarget {
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return &ISCSITarget{
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SCSITarget: target,
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TPGTs: make(map[uint16]*iSCSITPGT),
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Sessions: make(map[uint16]*ISCSISession),
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}
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}
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func (tgt *ISCSITarget) Init() error {
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return nil
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}
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func (tgt *ISCSITarget) Exit() error {
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return nil
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}
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func (tgt *ISCSITarget) CreateTarget(target *api.SCSITarget) error {
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return nil
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}
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func (tgt *ISCSITarget) DestroyTarget(target *api.SCSITarget) error {
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return nil
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}
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func (tgt *ISCSITarget) CreatePortal(name string) error {
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return nil
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}
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func (tgt *ISCSITarget) DestroyPortal(name string) error {
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return nil
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}
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func (tgt *ISCSITarget) CreateLu(lu *api.SCSILu) error {
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return nil
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}
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func (tgt *ISCSITarget) GetLu(lun uint8) (uint64, error) {
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return 0, nil
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}
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func (tgt *ISCSITarget) CommandNotify(nid uint64, result int, cmd *api.SCSICommand) error {
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return nil
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}
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