XL State Machine Problem
fred.dutton at qlogic.com
Fri Mar 26 15:16:56 PST 2004
* From the T10 Reflector (t10 at t10.org), posted by:
* Fred Dutton <fred.dutton at qlogic.com>
Thank you for the correction.
I had a misunderstanding of how an expander's external port interfaces with an internal port.
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> Subject: RE: XL State Machine Problem
> Date: Fri, 26 Mar 2004 14:22:15 -0600
> Thread-Topic: XL State Machine Problem
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> From: "Elliott, Robert (Server Storage)" <elliott at hp.com>
> To: <t10 at t10.org>
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> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Elliott, Robert (Server Storage)" <elliott at hp.com>
> > * From the T10 Reflector (t10 at t10.org), posted by:
> > * Fred Dutton <fred.dutton at qlogic.com>
> > *
> > SAS 1.1 Rev 04, sub clause 18.104.22.168, does not mention the
> > need to send a Transmit Break request to the ECR when a BREAK
> > Received message is received.
> > I think a BREAK Received message should be handled in a way
> > analogous to the way a CLOSE Received message is handled in the
> > XL8:Close_Wait state.
> > Suggested wording:
> > "If a BREAK Received message is received, this state shall
> > send a Transmit Break request to the ECR."
> > Thanks,
> > Fred Dutton
> > QLogic Corporation
> > 949.389.6340
> XL10 has already "released path resources" so there is no recipient phy
> on the other side of the ECR to receive the Transmit Break
> XL only enters XL10 because:
> XL3:Open_Confirm_Wait received a Transmit Break indication
> XL6:Open_Response_Wait received a Transmit Break indication
> XL7:Connected received a Transmit Break indication
> XL8:Close_Wait received a Transmit Break indication
> All these mean the remote phy was the source of the break. If it had
> sent Transmit BREAK because it received a BREAK, it has concurrently
> sent a BREAK in response from its own XL10 state.
> A BREAK received by this phy in XL10 just closes the BREAK/BREAK round
> trip on this side. No further propagation is necessary.
> Rob Elliott, elliott at hp.com
> Hewlett-Packard Industry Standard Server Storage Advanced Technology
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