Error in SPL-r04 MT_IP (transport Layer for SMP initiator port) State Machine?

Penokie, George George.Penokie at
Mon Dec 7 08:29:49 PST 2009

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	On investigation it was discovered that in proposal 05-305r0 the
following was deleted:
	If the SMP Frame Receive Timeout timer expires before a Received SMP
Function Complete confirmation is received, this state shall send an SMP
Frame Receive Timeout confirmation to the management application layer and
send an SMP Transmit Break request to the port layer.
	This is the only reference to the SMP Frame Receive Timeout
confirmation and as a result of the above deleted statements the
MT_IP3:Receive state in the MT_IP state machine figure should have also been
	As a result the SMP Frame Receive Timeout confirmation has been
deleted from the MT_IP state machine figure.
Bye for now,
George Penokie
LSI Corporation
3033 41st St. NW
Suite 100
Rochester, MN 55901
george.penokie at
From: owner-t10 at [mailto:owner-t10 at] On Behalf Of Alan Westbury
Sent: Saturday, November 14, 2009 5:46 AM
To: t10 at
Subject: Error in SPL-r04 MT_IP (transport Layer for SMP initiator port)
State Machine?
Hi T10,
SPL Figure 146 shows message "SMP Frame Receive Timeout" in state
This message is not covered by the clause describing this state
Looking back at SAS 1.1, there used to be a vendor specific "SMP Frame
Receive Timeout timer".  On expiry of this timer, MT_IP informed the
management application, and sent a Break request to the Port Layer.  This
would appear to account for the message shown in Fig 146.
In SAS 2 / SPL the timing requirement has shifted to the MT_TP state machine,
but it's now unclear what the MT_IP response should be in the event of a
Alan Westbury
Product Architect
Storage Systems,
Langstone Road, Havant, PO9 1SA
United Kingdom
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