FW: SAS - discard & ignore frames

[Leshay, Bruce]

* From the T10 Reflector (t10 at t10.org), posted by:
* "Leshay, Bruce" <Bruce_Leshay at Maxtor.com>
*
Rob,

	I thought that "discard" meant you ACK the frame and then drop it,
while "ignore" meant that the frame does not result in an ACK or NAK.
Whether that is currently true in the spec or not, I think we do need two
clear terms to differentiate not ACK'ing the frame with ACK'ing it and then
discarding it.

						Bruce Leshay	
						Maxtor Corporation

-----Original Message-----
From: Elliott, Robert [mailto:Robert.Elliott at COMPAQ.com]
Sent: Wednesday, May 01, 2002 10:18 PM
To: t10 at t10.org
Subject: RE: SAS - discard & ignore frames


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert" <Robert.Elliott at COMPAQ.com>
*
We discussed this Monday and some clarification will be made.  I assume
you're reading the SSP transport layer section.  The link layer had to
already ACK the frame for the transport layer to even see the frame.
"Discard" (which will be used rather than "ignore") means the transport
layer doesn't do anything with the frame.

There is debate about whether the link layer should check the hashed source
and destination device names and withhold ACK if they don't match the source
and destination device names which formed the connection.  The Serial
Attached SCSI WG plans to vote for one of these options in the first June
meeting:
1) drop the hashed source and destination altogether
2) keep them; mandate the link layer check them (no ACK on mismatch and
discarded)
3) keep them; mandate the transport layer check them (ACK on mismatch and
discarded)

---
Rob Elliott
Robert.Elliott at compaq.com


> -----Original Message-----
> From: Sriram Srinivasan [mailto:srirams at lsil.com]
> Sent: Wednesday, May 01, 2002 7:09 PM
> To: t10 at t10.org
> Subject: SAS - discard & ignore frames
> 
> There are quite a few places in the SAS proposed working 
> draft where it says 
> ignore the contents of the frame or discard the frame.  I'm 
> assuming this 
> means that the device is dumping all these DWORDs and does 
> not send back an 
> ACK or NAK primitive.
> 
> Is this assumption true?
> 
> thanx,
> \Sriram\
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