RE: sector alignment for DataOut PDUs?

[Martins Krikis <mkrikis@yahoo.com>]

I like the DataPDUAlignment parameter.
(Just mandating to send maximum amount of data
that's allowed, while being a good thing,
still cannot guarantee the right alignment
if those limits are not the right multiples.)

But I don't see why the selection function should be
the minimum of two numbers. That way the outcome may
be completely inapropriate for the target. 
I think that whatever the target declares should be
the final value. So the selection function should
be called, IMHO, "target said so".

Also, (I'm quoting Nick):
> When DataPDUAlignment is non-zero, 
> for any PDU other than the last in a
> sequence, the PDU data segment length
> (DataSegmentLength) is required to
>  be an integer multiple of DataPDUAlignment
> less than or equal to MaxRecvPDULength.

In case of Data_out pdu-s even the last one should
be aligned, shouldn't it? Since all PDU-s have
brought data aligned on block-size, if the last
one does the same, we guarantee that the total
data transfer length is a multiple of block-size,
which certainly must be so, right? So far I don't
see a guarantee that it will be, but I feel it
must match the length carried by CDB which is
expressed as the number of blocks...

Finally, speaking about MaxRecvPDULength, this
really is the last of operational parameters that
is not negotiated, but instead declared, right? That
makes it different from others. Plus, the same key
means different things depending on which direction
it is sent. While I'm not as upset with this as I
was about RFMarkInt, wouldn't it look cleaner if
we used two different keys, MaxORecvPDULength and
MaxIRecvPDULength? We could even say that they
are negotiated with the very special selection
functions "initiator said so" and "target said so",
respectively...

Any comments?

  Martins Krikis, Intel Corp.

Disclaimer: These opinions are my own and may not
            reflect those of my employer.


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