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

[Martins Krikis <mkrikis@yahoo.com>]

--- 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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