FW: SAS - discard & ignore frames

[Sriram Srinivasan]

* From the T10 Reflector (t10 at t10.org), posted by:
* Sriram Srinivasan <srirams at lsil.com>
*
  Actually the words "ignore the frame" and "discard the frame" occur in the 
transport layer checks (see 8.2.6.2).  so certainly (by virtue of being 
placed in the transport layer checks) the word "ignore" cannot mean no ACK 
since (like Rob pointed out) the transport does not see the frame if it was 
not ACKed!
  
  \Sriram\
  
~ 
~ * 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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~ *
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----------------------------------------------------------------------
	"FORGET NOT THAT THE EARTH DELIGHTS TO FEEL YOUR BARE FEET,
               AND THE WINDS LONG TO PLAY WITH YOUR HAIR"
                                          -Khalil Gibran

 Sriram Srinivasan                       Sriram.Srinivasan at lsil.com
 ASIC Design Engineer, LSI Logic,
 2001 Danfield Ct., 				Phone: 970-206-5847
 Fort Collins, CO 80525				FAX  : 970-206-5244
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*
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