Re: TMF for a write with only unsolicited data
"Eddy Quicksall" <[email protected]>
| Newsgroups | gmane.ietf.ips |
|---|---|
| Message-ID | <[email protected]> |
No. The case is not a TASK REASSIGN. It is for a write command where all of the data is unsolicited.
If the STag is used for the associated R2T's then it would seem WSV would be set to 0 when no R2T's were issued.
Further it says "The Write STag
Valid flag is set to one when there is solicited data to be
transferred"
Doesn't that mean the STag is only used if there was solicited data with the command?
Eddy
----- Original Message -----
From: Mike Ko
To: Eddy Quicksall
Cc: [email protected]
Sent: Monday, March 13, 2006 7:14 PM
Subject: Re: [Ips] TMF for a write with only unsolicited data
If I understand your question correctly, I assume the TMF is a TASK REASSIGN and it is for a write command qualified with DataDescriptorOut. DataDescriptorOut is used to describe the I/O buffer starting with the immediate unsolicited data (if any), followed by the non-immediate unsolicited data (if any) and solicited data. A Write STag is allocated in this case. The Write STag is used by the iSER layer at the target in handling the data transfer associated with the R2T PDUs and in returning the SCSI Response PDU using the SendInvSE message. Since there is non-immediate unsolicited data, WSV is set to 1.
Mike
To: <[email protected]>
cc:
Subject: [Ips] TMF for a write with only unsolicited data
Suppose:
1) a TMF is not a TASK REASSIGN
2) the TMF is for a write command
3) the write command only has unsolicited data
I think this is saying the WSV is set to 0 for this case. Is that correct?
If so then I think the 3rd bullet item in 7.3.3 needs to say "if allocated" since a write with unsolicited only will also have a DataDescriptorOut.
Or am I wrong in that the TMF would have the DataDescriptorOut for a write with only unsolicited data?
WSV - Write STag Valid flag: 1 bit
This flag indicates the validity of the Write STag field of the
iSER Header. If set to one, the Write STag field in this iSER
Header is valid. If set to zero, the Write STag field in this
iSER Header MUST be ignored at the receiver. The Write STag
Valid flag is set to one when there is solicited data to be
transferred for a SCSI Write or bidirectional command, or when
there are non-immediate unsolicited and solicited data to be
transferred for the referenced task specified in a Task
Management Function Request with the TASK REASSIGN function.
7.3.3 Task Management Function Request/Response
* It MUST use the ITT as specified in the Referenced Task Tag from
the Task Management Function Request PDU to locate the existing
STag(s), if any, in the Local Mapping(s) that associates the ITT
to the local STag(s).
* It MUST invalidate the existing STag(s), if any, and the Local
Mapping(s) that associates the ITT to the local STag(s).
* It MUST allocate a Read STag for the I/O Buffer as defined by the
qualifier DataDescriptorIn if the Send_Control Operational
Primitive invocation is qualified with DataDescriptorIn.
Eddy_______________________________________________
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