Re: iSCSI: ordered command delivery at the target

[Luben Tuikov <luben@splentec.com>]

Amir Shalit wrote:
> 
> It does it for new commands but not for existing once
> like what you are suggesting. It's all about "delivery".

Even the more reason to implement this.

Once a command has been delivered for execution to the
device server, this means that Data-out pdu's (if any)
have already been delivered (i.e. the command with its
data (if any) has been delivered to the target).
Thus no new ones are coming, thus, CmdSN may wrap
around that CmdSN (submitted task).

As for SNACK -- it will become a command
if assigned CmdSN. (i.e. no reference to tasks,
since they are refered to by SNACK->ITT).
And for SNACK of type DataAck, this can be
Immediate since the Target is keeping the whole
thing into a ``pending (data) ack'' queue.

Anyway...

Comments? (on the original postng)

-- 
Luben