RE: iSCSI: Login Request error

[Martins Krikis <mkrikis@yahoo.com>]

--- Bill Studenmund <wrstuden@wasabisystems.com>
wrote:

> I'm not sure about renegotiating REJECTED keys. I
> think it'd depend on
> what the likely reasons for rejection are, and how
> likely they will be
> different the second time.

Aha! :-) (Pat has actually already described almost
word by word what I was planning to say about any
reasons given, but I'll do the same anyway...)
So we have to look at what the reasons could be.

Junk value on binary key? Why was it sent in the
first place? Inadmissible numerical value, string
literal, or range sent? Again, why should the
responder cut any slack to such initiators and let
them try again? A list sent consisting of values 
that are not agreeable to the responder? If there
are more values that the originator could offer,
why weren't they included in the first request?
The only understandable reason I can imagine is
for trying out numeric ranges, one after another
in the order of preference. But if this is the
reason for allowing renegotiations, then we'd be
better off introducing lists of ranges, a thing that
has been discussed here, but was decided as yet
unnecessary. So this could not be the reason.

There is a somewhat risky use for sending
a junk value however---it can simply be used to let
the other side pick something w/o restrictions. But
there is no guarantee that the other side will not
Reject it and consider the whole negotiation
sequence failed with that (which in my understanding
(and I could dig up the relevant messages on the
list) is also a valid behavior).

> I guess irrelevant makes sense for things like
> negotiating marker spacing
> when you don't support markers.

But we don't have any dependencies between parameters
anymore, and that includes the marker-related keys.
It is quite possible to view them as independent.
It is alright to negotiate the marker interval but
not turn on the use of markers.
(By using 0 as a special interval value, we 
could also eliminate the boolean marker keys,
but that's unimportant).

Anyway, thanks for keeping the discussion up!

  Martins Krikis, Intel Corp.

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



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