RE: iSCSI: use of Text/Login with no data segment

["Julian Satran" <Julian_Satran@il.ibm.com>]

I would like to keep Pat's wording including SHOULD.  It has text about "nothing to say" and I put it there to avoid abuse and allow a cautious party to terminate a negotiation not standing by the rules.  I even considered MUST but I think that some implementations may want to (seldom) send an empty PDU (simpler implementation).

Julo

pat_thaler@agilent.com 06/15/2002 02:38 AM Please respond to pat_thaler

To:        mkrikis@yahoo.com, pat_thaler@agilent.com, Julian Satran/Haifa/IBM@IBMIL, ips@ece.cmu.edu         cc:                 Subject:        RE: iSCSI: use of Text/Login with no data segment

Martins,

Your alternate wording looks fine to me.

Pat

-----Original Message-----
From: Martins Krikis [mailto:mkrikis@yahoo.com]
Sent: Friday, June 14, 2002 4:32 PM
To: pat_thaler@agilent.com; Julian_Satran@il.ibm.com; ips@ece.cmu.edu
Subject: Re: iSCSI: use of Text/Login with no data segment


--- pat_thaler@agilent.com wrote:

> If one wants to retain the idea of not sending empty
> PDUs when you do have
> something to say, one could put in:
> A target or initiator SHOULD NOT use a Text/Login
> Response or Text/
> Login Request with no data segment
> (DataSegmentLength 0) unless
> responding to a Text/Login Request or Text/Login
> Response, respectively,
> with the T bit set to 0 while the node has no keys
> to send or with the C bit
> set to 1.

I don't see a problem with an implementation that
deliberately sends an empty PDU to let the other 
side "speak" first. Doing this back-and-forth would 
not be a great situation, but IMHO it suffices to
simply discourage such behavior, without resorting
to "SHOULD NOT"-s.

So, how about this instead?

  A target or initiator is discouraged from
  sending Text/Login Response or Text/Login Request
  with no data segment (DataSegmentLength 0) unless
  responding to a Text/Login Request or Text/Login
  Response, respectively, with the C bit set to 1,
  or the F/T bit set to 0 while having no keys to
  send.

Or, let's just skip such restrictions/discouragements
entirely.

Martins Krikis, Intel Corp.

Disclaimer: these opinions are mine and may not
            be those of my employer.



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