queries Regarding Transport layer (part 2)

George Penokie gop at us.ibm.com
Thu Jul 6 13:02:00 PDT 2006


Formatted message: <A HREF="r0607066_f.htm">HTML-formatted message</A>

Sandeep,
The ST_IFR state machine notifies the application client of the receipt of 
a Transmission Complete (Command Failed, ACK/NAK Timeout) message by 
sending a Command Complete Received (Service Delivery or Target Failure - 
ACK/NAK Timeout) confirmation/argument. 
The ST_IFR state machine notifies the application client of the receipt of 
a Transmission Complete (Command Failed, NAK Received) message by sending 
a Command Complete Received (Service Delivery or Target Failure - NAK 
Received) confirmation/argument. 
This information is listed in table 138 Confirmations sent to the SCSI 
application layer if a frame transmission or reception error occurs from 
SAS-2 rev 4a.
Bye for now,
George Penokie
Dept 9A8 030-3 A410
E-Mail:    gop at us.ibm.com
Internal:  553-5208
External: 507-253-5208
sandeep taneja <sandeep.taneja at mail.nsysinc.com> 
07/06/2006 12:58 AM
To
George Penokie/Rochester/IBM at IBMUS
cc
t10 at t10.org, Monika <monika.talwar at nsysinc.com>
Subject
Re: queries Regarding Transport layer (part 2)
Hi George
Thanks for providing very clear explanation & confirming that Rules for
failure of data frame.
There is doubt on how ST_IFR will notify Application layer that NAK or
ACK/NAK timeout have occurred for the data frame. ie Handling of message
Transmission Complete (Data-Out Failed, NAK Received) or Transmission 
Complete (Data-Out Failed, ACK/ NAK Timeout) by ST_IFR machine.
Thanks once again.
On Thu, 2006-07-06 at 01:17, George Penokie wrote:
> Sandeep,
> 
> I made a slight error in my first note to you. I quoted the paragraph 
that 
> is the response to a failure in the request to send the DATA frame not 
the 
> failure of the source to receive the DATA frame. That information is in 
> Table 141 ? Messages sent to the ST_IFR state machine in the last two 
> rows. So the message sent to the ST_IFR state machine is either 
> Transmission Complete (Data-Out Failed, NAK Received) or Transmission 
> Complete (Data-Out Failed, ACK/ NAK Timeout).
> 
> Bye for now,
> George Penokie
> 
> Dept 9A8 030-3 A410
> E-Mail:    gop at us.ibm.com
> Internal:  553-5208
> External: 507-253-5208
> 
> 
> 
> sandeep taneja <sandeep.taneja at mail.nsysinc.com> 
> Sent by: owner-t10 at t10.org
> 06/30/2006 02:33 AM
> 
> To
> t10 at t10.org
> cc
> Mark_Evans at maxtor.com
> Subject
> queries Regarding Transport layer
> 
> 
> 
> 
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * sandeep taneja <sandeep.taneja at mail.nsysinc.com>
> *
> Hello !!
> 
> Could anybody help me for solving some doubts in Transport layer.
> I have few doubts regarding implementation of Transport layer state
> machines.
> 
> I am referring to SAS2r03a 22 April 2006.
> 
> Following are queries :
> 1.How does ST_ITS state machine notify ST_IFR state machine that NAK or
> ACK/NAK timeout have occurred for DATA frame corresponding to first
> enable burst.Is it going to use same message as it is using for the DATA
> frame corresponding to XFER_RDY frame? 
> 
> if yes, then message( Transmission complete(Data-out failed,NAK
> received)corresponding to NAK & message Transmission complete(Data-out
> failed,ACK/NAK Timeout)) ST_ITS uses to notify ST_IFR is given but How
> ST_IFR will handle these message or notify Application layer about data
> sending failure seems to be missing.
> 
> 
> 
> Thanks. 
> 
> 
> -- 
> --------------------------------------------
> Regards
> Sandeep Taneja
> 
> nSys Design Systems
> Accelerating designs
> http://www.nsysinc.com
> --------------------------------------------
> 
> 
> 
> 
> 
> 
> 
> *
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