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package ipmi
import (
"context"
"fmt"
)
// 34.2 Read FRU Data Command
type ReadFRUDataRequest struct {
FRUDeviceID uint8
ReadOffset uint16
ReadCount uint8
}
type ReadFRUDataResponse struct {
CountReturned uint8
Data []byte
}
func (req *ReadFRUDataRequest) Command() Command {
return CommandReadFRUData
}
func (req *ReadFRUDataRequest) Pack() []byte {
out := make([]byte, 4)
packUint8(req.FRUDeviceID, out, 0)
packUint16L(req.ReadOffset, out, 1)
packUint8(req.ReadCount, out, 3)
return out
}
func (res *ReadFRUDataResponse) Unpack(msg []byte) error {
if len(msg) < 1 {
return ErrUnpackedDataTooShortWith(len(msg), 1)
}
res.CountReturned, _, _ = unpackUint8(msg, 0)
res.Data, _, _ = unpackBytes(msg, 1, len(msg)-1)
return nil
}
func (r *ReadFRUDataResponse) CompletionCodes() map[uint8]string {
return map[uint8]string{
0x81: "FRU device busy",
}
}
func (res *ReadFRUDataResponse) Format() string {
return "" +
fmt.Sprintf("Count returned : %d\n", res.CountReturned) +
fmt.Sprintf("Data : %02x\n", res.Data)
}
// The command returns the specified data from the FRU Inventory Info area.
func (c *Client) ReadFRUData(ctx context.Context, fruDeviceID uint8, readOffset uint16, readCount uint8) (response *ReadFRUDataResponse, err error) {
request := &ReadFRUDataRequest{
FRUDeviceID: fruDeviceID,
ReadOffset: readOffset,
ReadCount: readCount,
}
response = &ReadFRUDataResponse{}
err = c.Exchange(ctx, request, response)
return
}
// readFRUDataByLength reads FRU Data in loop until reaches the specified data length
func (c *Client) readFRUDataByLength(ctx context.Context, deviceID uint8, offset uint16, length uint16) ([]byte, error) {
var data []byte
c.Debugf("Read FRU Data by Length, offset: (%d), length: (%d)\n", offset, length)
for {
if length <= 0 {
break
}
res, err := c.tryReadFRUData(ctx, deviceID, offset, length)
if err != nil {
return nil, fmt.Errorf("tryReadFRUData failed, err: %w", err)
}
c.Debug("", res.Format())
data = append(data, res.Data...)
length -= uint16(res.CountReturned)
c.Debugf("left length: %d\n", length)
// update offset
offset += uint16(res.CountReturned)
}
return data, nil
}
// tryReadFRUData will try to read FRU data with a read count which starts with
// the minimal number of the specified length and the hard-coded 32, if the
// ReadFRUData failed, it try another request with a decreased read count.
func (c *Client) tryReadFRUData(ctx context.Context, deviceID uint8, readOffset uint16, length uint16) (response *ReadFRUDataResponse, err error) {
var readCount uint8 = 32
if length <= uint16(readCount) {
readCount = uint8(length)
}
for {
if readCount <= 0 {
return nil, fmt.Errorf("nothing to read")
}
c.Debugf("Try Read FRU Data, offset: (%d), count: (%d)\n", readOffset, readCount)
res, err := c.ReadFRUData(ctx, deviceID, readOffset, readCount)
if err == nil {
return res, nil
}
if respErr, ok := isResponseError(err); ok {
cc := respErr.CompletionCode()
if readFRUDataLength2Big(cc) {
readCount -= 1
continue
}
}
return nil, fmt.Errorf("ReadFRUData failed, err: %w", err)
}
}
func readFRUDataLength2Big(cc CompletionCode) bool {
return cc == CompletionCodeRequestDataLengthInvalid ||
cc == CompletionCodeRequestDataLengthLimitExceeded ||
cc == CompletionCodeCannotReturnRequestedDataBytes
}
|
