Re: iSCSI & Linked Commands

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

Charles Monia wrote:
 
> > Mark has already replied to your question on why linked commands won't
> > work given today's implementations. In most cases, the initiator task
> > tag is either generated in the HBA driver or in the HBA firmware.
> 
> The fact that some adapter implementations on some interconnects may not
> support linked commands does not grant a license to delete the capability
> from the protocol specification.

Charles,

I was'nt saying that iSCSI must not support linked commands. See my
comment on this :

> I agree that there is no need to say linked commands are unsupported
> since this is a ULP feature and support or lack thereof is decided at
> the initiator and target ULPs.  

What I did say was that several/most implementations perform task tag
initialization at the LLP or further below rendering this feature
un-usable in several cases. 

The more interesting question is :
Is there any particular reason connection allegiance would rather be
enforced per command than per task ? (if linked commands are un-used,
this is a moot question....). If it were enforced per task, then, an
Abort Task would effectively flush all stale PDUs of that task ensuring
no stale PDUs in the network upon I/O termination at the initiator.

- Santosh
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