iSCSI : digest error handling violates EMDP/InDataOrder

[Santosh Rao <santoshr@cup.hp.com>]

Where :
=======

Section 6.2 (pg 80). Digest Errors
-----------------------------------
"If the error is a Data-Digest-Error in a Data-PDU, the target MUST
either request retransmission with a R2T or answer with a Reject iSCSI
PDU and abort the task."

Problem :
---------
On a Data digest error detected by a target, it MUST NOT request
re-transmission of the data PDU thru an R2T if the session login key
InDataOrder is set to yes. The current rev 05 draft violates
InDataOrder/EMDP settings by allowing a re-transmission of R2T by
target.

Scenario :
==========
initiator			target
---------			------
EMDP=0
InDataOrder=YES
(exp_off=0)
	   offset=0,len=64k <------ R2T
	
--------> data PDUs
(exp_off = 64K)
                              data digest error results in
			      an 8K PDU being dropped at offset 24K.

	  offset=24K,len=8K  <------ R2T for missing PDU.

exp_off != offset


- Santosh
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