Re: iscsi: More immediate data than required data

[Julian Satran <Julian_Satran@xxxxxxxxxx>]

If you are talking about a discrepancy
between the CDB indicated length in blocks and the total data length (including
immediate) indicated by iSCSI (originated from SCSI) this is legal and
the result will include a residula lenngth and an "underflow"
(device needs more data than accomodated by SCSI buffer). The specific
command set indicates how the blocks on the device will be filled (padded).

If you are talking about Immediate data
exceeeding iSCSI total data length (originated from SCSI)  that is
a protocol error and should be handled accordingly.
The command should be rejected and dropping
the session depends on the leniency of the target.

Julo

"Barada Mishra" <bsmishra@xxxxxxxxx>

25/01/07 23:08

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Subject	iscsi: More immediate data than required data

Hi,

This question is from a iSCSI target point of view.

When a target receives more immediate data than the required data, what
should be the behavior?

Example :
Assume the target receives a write command for 2 blocks (1024 bytes). 
But the associated immediate data it receives is 2048.

What should the target do
  1. Use only 1024 bytes, ignore the rest of data and return good
status
  2. Return check condition (what should be the ASC/ASCQ)? 
  3. Drop the connection and/or session
  4. Reject the PDU
Or something else?

Thanks
Barada
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