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passthru.go
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passthru.go
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/*
* Copyright 2020, 2021, 2022 Hewlett Packard Enterprise Development LP
* Other additional copyright holders may be indicated within.
*
* The entirety of this work is 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 switchtec
import (
"unsafe"
"github.com/HewlettPackard/structex"
)
const (
NvmeAdminPassthruMaxDataLength = 4096 + 16*4
)
// NvmeAdminPassthru will send an ADMIN PASSTHRU command to device and get reply
// `pdfid` is the Physical Device Function Identifier
// `data` is payload transmitted to the device
// `expRspLen` is the expected response length from the command
func (dev *Device) NvmeAdminPassthru(pdfid uint16, data []byte, expRspLen int) ([]byte, error) {
dev.Lock()
defer dev.Unlock()
rspLen, err := dev.adminPassthruStart(pdfid, data, expRspLen)
if err != nil {
return nil, err
}
rsp := make([]byte, 0)
if rspLen != 0 {
rsp, err = dev.adminPassthruData(pdfid, rspLen)
if err != nil {
return nil, err
}
}
err = dev.adminPassthruEnd(pdfid)
return rsp, err
}
func (dev *Device) adminPassthruStart(pdfid uint16, data []byte, expRspLen int) (uint16, error) {
type passthruStartCmd struct {
Subcmd uint8
Reserved0 [3]uint8
Pdfid uint16
ExpectedRspLen uint16
MoreData uint8
Reserved1 [3]uint8
DataOffset uint16
DataLen uint16
Data [maxDataLength - 16]byte
}
cmd := passthruStartCmd{
Subcmd: uint8(NvmeAdminPassthruStart),
Pdfid: pdfid,
}
if sz, _ := structex.Size(cmd); sz != maxDataLength {
panic("adminPassthruStart cmd is incorrect size, use structure packing")
}
dataOffset := 0
if data != nil && len(data) != 0 {
cmd.MoreData = 0
if len(data) > int(unsafe.Sizeof(cmd.Data)) {
cmd.MoreData = 1
}
for cmd.MoreData != 0 {
dataLen := copy(cmd.Data[:], data[dataOffset:])
cmd.DataOffset = uint16(dataOffset)
cmd.DataLen = uint16(dataLen)
if err := dev.RunCommand(NvmeAdminPassthruCommand, &cmd, nil); err != nil {
return 0, err
}
dataOffset += dataLen
cmd.MoreData = 0
if len(data)-dataOffset > int(unsafe.Sizeof(cmd.Data)) {
cmd.MoreData = 1
}
}
if dataOffset < len(data) {
dataLen := copy(cmd.Data[:], data[dataOffset:])
cmd.DataOffset = uint16(dataOffset)
cmd.DataLen = uint16(dataLen)
} else {
cmd.DataOffset = 0
cmd.DataLen = 0
}
}
type passthruStartRsp struct {
RspLen uint16
Reserved0 uint16
}
rsp := new(passthruStartRsp)
if sz, _ := structex.Size(rsp); sz != 4 {
panic("adminPassthruStart rsp is incorrect size, use structure packing")
}
cmd.ExpectedRspLen = uint16(expRspLen)
if err := dev.RunCommand(NvmeAdminPassthruCommand, &cmd, rsp); err != nil {
return 0, err
}
return rsp.RspLen, nil
}
func (dev *Device) adminPassthruData(pdfid uint16, rspLen uint16) ([]byte, error) {
type passthruDataCmd struct {
SubCommand uint8
Reserved0 [3]uint8
Pdfid uint16
Offset uint16
}
cmd := passthruDataCmd{
SubCommand: uint8(NvmeAdminPassthruData),
Pdfid: pdfid,
Offset: 0,
}
if sz, _ := structex.Size(cmd); sz != 8 {
panic("adminPassthruData cmd is incorrect size, use structure packing")
}
type passthruDataRsp struct {
Offset uint16
Len uint16
Data [maxDataLength - 4]byte
}
rsp := new(passthruDataRsp)
if sz, _ := structex.Size(rsp); sz != maxDataLength {
panic("adminPassthruData rsp is incorrect size, use structure packing")
}
rspData := make([]byte, rspLen)
for offset := uint16(0); offset < rspLen; offset += rsp.Len {
cmd.Offset = offset
if err := dev.RunCommand(NvmeAdminPassthruCommand, cmd, rsp); err != nil {
return nil, err
}
copy(rspData[offset:], rsp.Data[:rsp.Len])
}
return rspData, nil
}
func (dev *Device) adminPassthruEnd(pdfid uint16) error {
type passthruEndCmd struct {
SubCommand uint8
Reserved0 [3]uint8
Pdfid uint16
Reserved1 uint16
}
cmd := passthruEndCmd{
SubCommand: uint8(NvmeAdminPassthruEnd),
Pdfid: pdfid,
}
if sz, _ := structex.Size(cmd); sz != 8 {
panic("adminPassthruEnd cmd is incorrect size, use structure packing")
}
return dev.RunCommand(NvmeAdminPassthruCommand, cmd, nil)
}