735 lines
19 KiB
Go
735 lines
19 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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// SCSI primary command processing
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package scsi
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"github.com/golang/glog"
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"github.com/gostor/gotgt/pkg/api"
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"github.com/gostor/gotgt/pkg/util"
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)
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func SPCIllegalOp(host int, cmd *api.SCSICommand) api.SAMStat {
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BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
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return api.SAMStatCheckCondition
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}
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func SPCLuOffline(lu *api.SCSILu) error {
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lu.Attrs.Online = true
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return nil
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}
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func SPCLuOnline(lu *api.SCSILu) error {
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if luPreventRemoval(lu) {
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return fmt.Errorf("lu prevent removal")
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}
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lu.Attrs.Online = false
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return nil
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}
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func InquiryPage0x00(host int, cmd *api.SCSICommand) (*bytes.Buffer, uint16) {
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var (
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buf = &bytes.Buffer{}
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descBuf = &bytes.Buffer{}
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data []byte = []byte{}
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pageLength uint16 = 0
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)
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descBuf.WriteByte(0x00)
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descBuf.WriteByte(0x80)
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descBuf.WriteByte(0x83)
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/*
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TODO:
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descBuf.WriteByte(0x86)
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descBuf.WriteByte(0xB0)
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descBuf.WriteByte(0xB2)
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*/
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data = descBuf.Bytes()
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pageLength = uint16(len(data))
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//byte 0
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if cmd.Device.Attrs.Online {
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buf.WriteByte(PQ_DEVICE_CONNECTED | byte(cmd.Device.Attrs.DeviceType))
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} else {
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buf.WriteByte(PQ_DEVICE_NOT_CONNECT | byte(cmd.Device.Attrs.DeviceType))
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}
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//byte 1
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//PAGE CODE
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buf.WriteByte(0x00)
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//PAGE LENGTH
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binary.Write(buf, binary.BigEndian, pageLength)
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buf.Write(data)
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return buf, pageLength
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}
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func InquiryPage0x80(host int, cmd *api.SCSICommand) (*bytes.Buffer, uint16) {
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var (
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buf = &bytes.Buffer{}
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descBuf = &bytes.Buffer{}
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data []byte = []byte{}
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pageLength uint16 = 0
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)
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descBuf.WriteByte(0x20)
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descBuf.WriteByte(0x20)
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descBuf.WriteByte(0x20)
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descBuf.WriteByte(0x20)
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data = descBuf.Bytes()
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pageLength = uint16(len(data))
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//byte 0
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if cmd.Device.Attrs.Online {
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buf.WriteByte(PQ_DEVICE_CONNECTED | byte(cmd.Device.Attrs.DeviceType))
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} else {
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buf.WriteByte(PQ_DEVICE_NOT_CONNECT | byte(cmd.Device.Attrs.DeviceType))
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}
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//byte 1
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//PAGE CODE
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buf.WriteByte(0x80)
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//PAGE LENGTH
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binary.Write(buf, binary.BigEndian, pageLength)
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buf.Write(data)
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return buf, pageLength
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}
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func InquiryPage0x83(host int, cmd *api.SCSICommand) (*bytes.Buffer, uint16) {
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var (
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buf = &bytes.Buffer{}
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descBuf = &bytes.Buffer{}
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data []byte = []byte{}
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portName []byte
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pageLength uint16 = 0
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portID uint16 = cmd.RelTargetPortID
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portGroup uint16 = FindTargetGroup(cmd.Target, portID)
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targetPort *api.SCSITargetPort = FindTargetPort(cmd.Target, portID)
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)
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//DESCRIPTOR 1 TARGET NAME
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descBuf.WriteByte((PIV_ISCSI << 4) | INQ_CODE_ASCII)
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descBuf.WriteByte(0x80 | (ASS_TGT_PORT << 4) | DESG_VENDOR)
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descBuf.WriteByte(0x00)
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//length
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descBuf.WriteByte(byte(len([]byte(cmd.Target.Name))))
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//target name
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descBuf.Write([]byte(cmd.Target.Name))
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//DESCRIPTOR 2 NNA Locally
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descBuf.WriteByte((PIV_ISCSI << 4) | INQ_CODE_BIN)
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descBuf.WriteByte(0x80 | (ASS_LU << 4) | DESG_NAA)
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descBuf.WriteByte(0x00)
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//length
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descBuf.WriteByte(0x08)
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//NNA
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binary.Write(descBuf, binary.BigEndian, (cmd.Device.UUID | (uint64(NAA_LOCAL) << 60)))
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//TODO: Target Port Group(0x05), Relative Target port identifier(0x04)
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//DESCRIPTOR 3 TPG
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descBuf.WriteByte((PIV_ISCSI << 4) | INQ_CODE_BIN)
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descBuf.WriteByte(0x80 | (ASS_TGT_PORT << 4) | DESG_TGT_PORT_GRP)
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descBuf.WriteByte(0x00)
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//length
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descBuf.WriteByte(0x04)
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//TPG
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descBuf.WriteByte(0x00)
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descBuf.WriteByte(0x00)
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binary.Write(descBuf, binary.BigEndian, portGroup)
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//DESCRIPTOR 4 Relative Target Port ID
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descBuf.WriteByte((PIV_ISCSI << 4) | INQ_CODE_BIN)
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descBuf.WriteByte(0x80 | (ASS_TGT_PORT << 4) | DESG_REL_TGT_PORT)
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descBuf.WriteByte(0x00)
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//length
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descBuf.WriteByte(0x04)
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//RTPGI
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descBuf.WriteByte(0x00)
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descBuf.WriteByte(0x00)
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binary.Write(descBuf, binary.BigEndian, portID)
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//DESCRIPTOR 5 SCSI Name,Port
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portName = util.StringToByte(targetPort.TargetPortName, 4, 256)
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descBuf.WriteByte((PIV_ISCSI << 4) | INQ_CODE_UTF8)
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descBuf.WriteByte(0x80 | (ASS_TGT_PORT << 4) | DESG_SCSI)
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descBuf.WriteByte(0x00)
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//length
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descBuf.WriteByte(byte(len(portName)))
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//RTPGI
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descBuf.Write(portName)
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data = descBuf.Bytes()
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pageLength = uint16(len(data))
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//byte 0
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if cmd.Device.Attrs.Online {
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buf.WriteByte(PQ_DEVICE_CONNECTED | byte(cmd.Device.Attrs.DeviceType))
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} else {
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buf.WriteByte(PQ_DEVICE_NOT_CONNECT | byte(cmd.Device.Attrs.DeviceType))
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}
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//byte 1
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//PAGE CODE
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buf.WriteByte(0x83)
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//PAGE LENGTH
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binary.Write(buf, binary.BigEndian, pageLength)
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buf.Write(data)
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return buf, pageLength
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}
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/*
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* SPCInquiry Implements SCSI INQUIRY command
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* The INQUIRY command requests the device server to return information regarding the logical unit and SCSI target device.
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*
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* Reference : SPC4r11
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* 6.6 - INQUIRY
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*/
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func SPCInquiry(host int, cmd *api.SCSICommand) api.SAMStat {
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var (
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allocationLength uint16
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pageLength uint16
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additionLength byte
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buf = &bytes.Buffer{}
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data []byte = []byte{}
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addBuf = &bytes.Buffer{}
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addBufData []byte = []byte{}
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//b byte = 0x75
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scb []byte = cmd.SCB.Bytes()
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pcode byte = scb[2]
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evpd bool = false
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vendorID = make([]byte, 8)
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productID = make([]byte, 16)
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productRev = make([]byte, 4)
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)
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allocationLength = util.GetUnalignedUint16(scb[3:5])
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if scb[1]&0x01 > 0 {
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evpd = true
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}
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if cmd.Device == nil {
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goto sense
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}
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if evpd {
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switch pcode {
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case 0x00:
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buf, pageLength = InquiryPage0x00(host, cmd)
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case 0x80:
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buf, pageLength = InquiryPage0x80(host, cmd)
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case 0x83:
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buf, pageLength = InquiryPage0x83(host, cmd)
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default:
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goto sense
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}
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data = buf.Bytes()
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if allocationLength < pageLength {
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(data[0:allocationLength])
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} else {
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(data[0:])
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}
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} else {
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//byte 5
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//SCCS(0) AAC(0) TPGS(0) 3PC(0) PROTECT(0)
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addBuf.WriteByte(INQUIRY_TPGS_IMPLICIT)
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//byte 6
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//ENCSERV(0) VS(0) MULTIP(0) ADDR16(0)
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addBuf.WriteByte(0x00)
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//byte 7
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//WBUS16(0) SYNC(0) CMDQUE(1) VS1(0)
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addBuf.WriteByte(INQUIRY_CMDQUE)
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copy(vendorID, []byte(fmt.Sprintf("%-8s", cmd.Device.Attrs.VendorID)))
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addBuf.Write(vendorID)
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copy(productID, []byte(fmt.Sprintf("%-16s", cmd.Device.Attrs.ProductID)))
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addBuf.Write(productID)
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copy(productRev, []byte(fmt.Sprintf("%-4s", cmd.Device.Attrs.ProductRev)))
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addBuf.Write(productRev)
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//Vendor specific(20 bytes)
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for i := 0; i < 20; i++ {
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addBuf.WriteByte(0x00)
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}
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//byte 56
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addBuf.WriteByte(0x00)
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//byte 57
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addBuf.WriteByte(0x00)
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//VERSION DESCRIPTOR 1 ~ 8
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binary.Write(addBuf, binary.BigEndian, cmd.Device.Attrs.VersionDesction)
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addBufData = addBuf.Bytes()
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additionLength = byte(len(addBufData))
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//Write header
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//byte 0
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//PERIPHERAL QUALIFIER, PERIPHERAL DEVICE TYPE
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if cmd.Device.Attrs.Online {
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buf.WriteByte(PQ_DEVICE_CONNECTED | byte(cmd.Device.Attrs.DeviceType))
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} else {
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buf.WriteByte(PQ_DEVICE_NOT_CONNECT | byte(cmd.Device.Attrs.DeviceType))
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}
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// byte 1
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// RMB(0) LU_CONG(0)
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buf.WriteByte(0x00)
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// byte 2
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// VERSION
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buf.WriteByte(VERSION_WITHDRAW_SPC3)
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// byte 3
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// Reserved, Reserved, NORMACA, HISUP, RESPONSE DATA FORMAT
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buf.WriteByte(INQUIRY_HISUP | INQUIRY_STANDARD_FORMAT)
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// byte 4
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// ADDITIONAL LENGTH
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buf.WriteByte(additionLength)
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buf.Write(addBufData)
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data = buf.Bytes()
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if allocationLength < uint16(additionLength) {
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(data[0:allocationLength])
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} else {
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(data[0:])
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}
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}
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return api.SAMStatGood
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sense:
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BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
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return api.SAMStatCheckCondition
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}
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/*
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* SPCReportLuns Implements SCSI REPORT LUNS command
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* The REPORT LUNS command requests the device server to return the peripheral Device
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* logical unit inventory accessible to the I_T nexus.
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*
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* Reference : SPC4r11
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* 6.33 - REPORT LUNS
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*/
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func SPCReportLuns(host int, cmd *api.SCSICommand) api.SAMStat {
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var (
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remainLength uint32
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actualLength uint32 = 8
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availLength uint32 = 0
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allocationLength uint32
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buf *bytes.Buffer = &bytes.Buffer{}
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scb *bytes.Buffer = cmd.SCB
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)
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// Get Allocation Length
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allocationLength = util.GetUnalignedUint32(scb.Bytes()[6:10])
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if allocationLength < 16 {
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glog.Warningf("goto sense, allocationLength < 16")
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goto sense
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}
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remainLength = allocationLength
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if _, ok := cmd.Target.Devices[0]; !ok {
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availLength = 8 * uint32(len(cmd.Target.Devices)+1)
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} else {
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availLength = 8 * uint32(len(cmd.Target.Devices))
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}
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// LUN list length
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buf.Write(util.MarshalUint32(availLength))
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cmd.InSDBBuffer.Resid = int32(actualLength)
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// Skip through to byte 4, Reserved
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for i := 0; i < 4; i++ {
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buf.WriteByte(0x00)
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}
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//For LUN0
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if _, ok := cmd.Target.Devices[0]; !ok {
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buf.Write(util.MarshalUint64(0))
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remainLength -= 8
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}
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for lun := range cmd.Target.Devices {
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if remainLength > 0 {
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if lun > 0xff {
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lun = (0x01 << 30) | (0x3fff&lun)<<16
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} else {
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lun = (0x3fff & lun) << 16
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}
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lun = uint64(lun << 32)
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buf.Write(util.MarshalUint64(lun))
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remainLength -= 8
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}
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}
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cmd.InSDBBuffer.Buffer = buf
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return api.SAMStatGood
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sense:
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cmd.InSDBBuffer.Resid = 0
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BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
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return api.SAMStatCheckCondition
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}
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func SPCStartStop(host int, cmd *api.SCSICommand) api.SAMStat {
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var (
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pwrcnd, loej, start byte
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)
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if err := deviceReserve(cmd); err != nil {
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return api.SAMStatReservationConflict
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}
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cmd.InSDBBuffer.Resid = 0
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scb := cmd.SCB.Bytes()
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pwrcnd = scb[4] & 0xf0
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if pwrcnd != 0 {
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return api.SAMStatGood
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}
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loej = scb[4] & 0x02
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start = scb[4] & 0x01
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if loej != 0 && start == 0 && cmd.Device.Attrs.Removable {
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if luPreventRemoval(cmd.Device) {
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if cmd.Device.Attrs.Online {
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// online == media is present
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BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_MEDIUM_REMOVAL_PREVENTED)
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} else {
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// !online == media is not present
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BuildSenseData(cmd, NOT_READY, ASC_MEDIUM_REMOVAL_PREVENTED)
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}
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return api.SAMStatCheckCondition
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}
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SPCLuOffline(cmd.Device)
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}
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if loej != 0 && start != 0 && cmd.Device.Attrs.Removable {
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SPCLuOnline(cmd.Device)
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}
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return api.SAMStatGood
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}
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/*
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* SPCTestUnit Implements SCSI TEST UNIT READY command
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* The TEST UNIT READY command requests the device server to indicate whether the logical unit is ready.
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*
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* Reference : SPC4r11
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* 6.47 - TEST UNIT READY
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*/
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func SPCTestUnit(host int, cmd *api.SCSICommand) api.SAMStat {
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/*
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if err := deviceReserve(cmd); err != nil {
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return api.SAMStatReservationConflict
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}
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*/
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if cmd.Device.Attrs.Online {
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return api.SAMStatGood
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}
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if cmd.Device.Attrs.Removable {
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BuildSenseData(cmd, NOT_READY, ASC_MEDIUM_NOT_PRESENT)
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} else {
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BuildSenseData(cmd, NOT_READY, ASC_BECOMING_READY)
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}
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return api.SAMStatCheckCondition
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}
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func SPCPreventAllowMediaRemoval(host int, cmd *api.SCSICommand) api.SAMStat {
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if err := deviceReserve(cmd); err != nil {
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return api.SAMStatReservationConflict
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}
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// PREVENT_MASK = 0x03
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cmd.ITNexusLuInfo.Prevent = int(cmd.SCB.Bytes()[4] & 0x03)
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return api.SAMStatGood
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}
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/*
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* SPCModeSense Implement SCSI MODE SENSE(6) and MODE SENSE(10) command
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* The MODE SENSE command requests the device server to return the specified medium,
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* logical unit, or peripheral device parameters.
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*
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* Reference : SPC4r11
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* 6.11 - MODE SENSE(6)
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* 6.12 - MODE SENSE(10)
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*/
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func SPCModeSense(host int, cmd *api.SCSICommand) api.SAMStat {
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var (
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scb = cmd.SCB.Bytes()
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mode6 = (scb[0] == 0x1a)
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dbd = scb[1] & 0x8 /* Disable Block Descriptors */
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pcode = scb[2] & 0x3f
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pctrl = (scb[2] & 0xc0) >> 6
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subpcode = scb[3]
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blkDesctionLen = 0
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key = ILLEGAL_REQUEST
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asc = ASC_INVALID_FIELD_IN_CDB
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)
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if dbd == 0 {
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blkDesctionLen = 8
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}
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if pctrl == 3 {
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asc = ASC_SAVING_PARMS_UNSUP
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goto sense
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}
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_ = dbd
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_ = pcode
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_ = subpcode
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_ = mode6
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_ = blkDesctionLen
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return api.SAMStatGood
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sense:
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BuildSenseData(cmd, key, asc)
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return api.SAMStatCheckCondition
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}
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/*
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* SPCSendDiagnostics Implements SCSI SEND DIAGNOSTIC command
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* The SEND DIAGNOSTIC command requests the device server to perform diagnostic operations
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* on the SCSI target device, on the logical unit, or on both.
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*
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* Reference : SPC4r11
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* 6.42 - SEND DIAGNOSTIC
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*/
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func SPCSendDiagnostics(host int, cmd *api.SCSICommand) api.SAMStat {
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// we only support SELF-TEST==1
|
|
if cmd.SCB.Bytes()[1]&0x04 == 0 {
|
|
goto sense
|
|
}
|
|
|
|
return api.SAMStatGood
|
|
sense:
|
|
cmd.InSDBBuffer.Resid = 0
|
|
BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
|
|
return api.SAMStatCheckCondition
|
|
}
|
|
|
|
func getSCSICmdSize(opcode api.SCSICommandType) byte {
|
|
var scsi_command_size = []byte{6, 10, 10, 12, 16, 12, 10, 10}
|
|
|
|
return scsi_command_size[(byte(opcode)>>5)&7]
|
|
}
|
|
|
|
func reportOpcodesAll(cmd *api.SCSICommand, rctd int) error {
|
|
var (
|
|
data = []byte{0x00, 0x00, 0x00, 0x00}
|
|
)
|
|
for _, i := range []api.SCSICommandType{api.TEST_UNIT_READY, api.WRITE_6, api.INQUIRY, api.READ_CAPACITY, api.WRITE_10, api.WRITE_16, api.REPORT_LUNS, api.WRITE_12} {
|
|
data = append(data, byte(i))
|
|
// reserved
|
|
data = append(data, 0x00)
|
|
// service action
|
|
data = append(data, 0x00)
|
|
data = append(data, 0x00)
|
|
// reserved
|
|
data = append(data, 0x00)
|
|
// flags : no service action, possibly timeout desc
|
|
if rctd != 0 {
|
|
data = append(data, 0x02)
|
|
} else {
|
|
data = append(data, 0x00)
|
|
}
|
|
// cdb length
|
|
length := getSCSICmdSize(i)
|
|
data = append(data, (length>>8)&0xff)
|
|
data = append(data, length&0xff)
|
|
// timeout descriptor
|
|
if rctd != 0 {
|
|
// length == 0x0a
|
|
data[1] = 0x0a
|
|
for n := 0; n < 12; n++ {
|
|
data = append(data, 0x00)
|
|
}
|
|
}
|
|
}
|
|
buf := util.MarshalUint32(uint32(len(data) - 4))
|
|
buf = append(buf, data[4:]...)
|
|
cmd.InSDBBuffer.Buffer = bytes.NewBuffer(buf)
|
|
return nil
|
|
}
|
|
|
|
func reportOpcodeOne(cmd *api.SCSICommand, rctd int, opcode byte, rsa uint16, serviceAction bool) error {
|
|
return nil
|
|
}
|
|
|
|
// This is useful for the various commands using the SERVICE ACTION format.
|
|
func SPCServiceAction(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
// TODO
|
|
scb := cmd.SCB.Bytes()
|
|
reporting_options := scb[2] & 0x07
|
|
opcode := scb[3]
|
|
rctd := int(scb[2] & 0x80)
|
|
rsa := util.GetUnalignedUint16(scb[4:])
|
|
switch reporting_options {
|
|
case 0x00: /* report all */
|
|
glog.V(3).Infof("Service Action: report all")
|
|
err := reportOpcodesAll(cmd, rctd)
|
|
if err != nil {
|
|
glog.Error(err)
|
|
goto sense
|
|
}
|
|
case 0x01: /* report one no service action*/
|
|
glog.V(3).Infof("Service Action: report one no service action")
|
|
err := reportOpcodeOne(cmd, rctd, opcode, rsa, false)
|
|
if err != nil {
|
|
glog.Error(err)
|
|
goto sense
|
|
}
|
|
case 0x02: /* report one service action */
|
|
glog.V(3).Infof("Service Action: report one service action")
|
|
err := reportOpcodeOne(cmd, rctd, opcode, rsa, true)
|
|
if err != nil {
|
|
glog.Error(err)
|
|
goto sense
|
|
}
|
|
default:
|
|
goto sense
|
|
}
|
|
return api.SAMStatGood
|
|
|
|
sense:
|
|
cmd.InSDBBuffer.Resid = 0
|
|
BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
|
|
return api.SAMStatCheckCondition
|
|
}
|
|
|
|
func SPCPRReadKeys(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
allocationLength := util.GetUnalignedUint32(cmd.SCB.Bytes()[7:9])
|
|
if allocationLength < 8 {
|
|
goto sense
|
|
}
|
|
if cmd.InSDBBuffer.Length < allocationLength {
|
|
goto sense
|
|
}
|
|
// TODO
|
|
sense:
|
|
cmd.InSDBBuffer.Resid = 0
|
|
BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
|
|
return api.SAMStatCheckCondition
|
|
}
|
|
|
|
func SPCPRReadReservation(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRReportCapabilities(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
var (
|
|
buf []byte = make([]byte, 8)
|
|
availLength uint32 = 8
|
|
actualLength uint32 = 0
|
|
data *bytes.Buffer = cmd.InSDBBuffer.Buffer
|
|
)
|
|
allocationLength := util.GetUnalignedUint32(cmd.SCB.Bytes()[7:9])
|
|
if allocationLength < 8 {
|
|
goto sense
|
|
}
|
|
if cmd.InSDBBuffer.Length < allocationLength {
|
|
goto sense
|
|
}
|
|
binary.BigEndian.PutUint16(buf[0:2], uint16(8))
|
|
// Persistent Reservation Type Mask format
|
|
// Type Mask Valid (TMV)
|
|
buf[3] |= 0x80
|
|
// PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
|
|
buf[4] |= 0x80
|
|
// PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
|
|
buf[4] |= 0x40
|
|
// PR_TYPE_WRITE_EXCLUSIVE_REGONLY
|
|
buf[4] |= 0x20
|
|
// PR_TYPE_EXCLUSIVE_ACCESS
|
|
buf[4] |= 0x08
|
|
// PR_TYPE_WRITE_EXCLUSIVE
|
|
buf[4] |= 0x02
|
|
// PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
|
|
buf[5] |= 0x01
|
|
|
|
if err := binary.Write(data, binary.BigEndian, buf); err != nil {
|
|
goto sense
|
|
} else {
|
|
actualLength = availLength
|
|
}
|
|
cmd.InSDBBuffer.Resid = int32(actualLength)
|
|
return api.SAMStatGood
|
|
sense:
|
|
cmd.InSDBBuffer.Resid = 0
|
|
BuildSenseData(cmd, ILLEGAL_REQUEST, ASC_INVALID_FIELD_IN_CDB)
|
|
return api.SAMStatCheckCondition
|
|
}
|
|
|
|
func SPCPRRegister(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRReserve(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRRelease(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRClear(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRPreempt(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
func SPCPRRegisterAndMove(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
return api.SAMStatGood
|
|
}
|
|
|
|
/*
|
|
* SPCRequestSense Implements SCSI REQUEST SENSE command
|
|
* The REQUEST SENSE command requests the device server to return parameter data that contains sense data.
|
|
*
|
|
* Reference : SPC4r11
|
|
* 6.39 - REQUEST SENSE
|
|
*/
|
|
func SPCRequestSense(host int, cmd *api.SCSICommand) api.SAMStat {
|
|
var (
|
|
allocationLength uint32
|
|
actualLength uint32
|
|
data = &bytes.Buffer{}
|
|
)
|
|
|
|
allocationLength = util.GetUnalignedUint32(cmd.SCB.Bytes()[4:8])
|
|
if allocationLength > cmd.InSDBBuffer.Length {
|
|
allocationLength = cmd.InSDBBuffer.Length
|
|
}
|
|
BuildSenseData(cmd, NO_SENSE, NO_ADDITIONAL_SENSE)
|
|
if cmd.SenseLength < allocationLength {
|
|
actualLength = cmd.SenseLength
|
|
} else {
|
|
actualLength = allocationLength
|
|
}
|
|
if cmd.SenseBuffer != nil {
|
|
data.Write(cmd.SenseBuffer.Bytes()[:actualLength])
|
|
}
|
|
cmd.InSDBBuffer.Resid = int32(actualLength)
|
|
cmd.InSDBBuffer.Buffer = data
|
|
|
|
// reset sense buffer in cmnd
|
|
cmd.SenseBuffer = &bytes.Buffer{}
|
|
cmd.SenseLength = 0
|
|
|
|
return api.SAMStatGood
|
|
}
|