RE: iSCSI draft 12 'or Reserved' fields

["Randy Jennings" <randyj@data-transit.com>]

//My bad.  I meant Status instead of Response
//I guess what the draft is saying is that these fields are never reserved
because they could contain anything
//if not valid.  Validity has to be checked before any guess is made on the
field's contents.
//Is this a correct interpretation of the draft's intention?

9.4.2  Status

     The Status field is used to report the SCSI status of the command (as
     specified in [SAM2]) and is valid only if the Response Code is Command
     Completed at target.

//Bidirectional count
//I guess I do not see much difference between this:
9.4.5  Bidirectional Read Residual Count

     The Bidirectional Read Residual Count field is only valid in the case
     where either the u bit or the o bit is set. If neither bit is set, the
     Bidirectional Read Residual Count field SHOULD be zero.

9.4.7  ExpDataSN

     The number of Data-In (read) PDUs the target has sent for the command.

     This field is reserved if the response code is not Command Completed
     at Target or the command is a write command.
//And this(, except for the SHOULD vs. MUST)
9. iSCSI PDU Formats

     All multi-byte integers that are specified in formats defined in this
     document are to be represented in network byte order (i.e., big
     endian).  Any field that appears in this document assumes that the
     most significant byte is the lowest numbered byte and the most signif-
     icant bit (within byte or field) is the lowest numbered bit unless
     specified otherwise.

     Any compliant sender MUST set all bits not defined and all reserved
     fields to zero unless specified otherwise.  Any compliant receiver
     MUST ignore any bit not defined and all reserved fields unless speci-
     fied otherwise.

     Reserved fields are marked by the word "reserved", some abbreviation
     of "reserved" or by "." for individual bits when no other form of
     marking is technically feasible.


> -----Original Message-----
> From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
> Sent: Friday, April 19, 2002 1:39 AM
> To: Randy Jennings
> Subject: RE: iSCSI draft 12 'or Reserved' fields
>
>
> Response is always used.
> Bidir - I am not sure - the text says whhen it should be valid and it is
> not reserved otherwise.
>
> Thanks,
> Julo
>