linux-kernel - RE: [PATCH] [SCSI] LIBSAS: fix libsas link error issue

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Date:	Thu, 16 Jun 2011 10:18:44 +0800
From:	"Jack Wang" <jack_wang@...sh.com>
To:	"'Xiangliang Yu'" <yuxiangl@...vell.com>,
	"'James Bottomley'" <James.Bottomley@...senPartnership.com>
Cc:	<yxlraid@...il.com>, <lucas.demarchi@...fusion.mobi>,
	<maciej.trela@...el.com>, <dan.j.williams@...el.com>,
	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"'Jacky Feng'" <jfeng@...vell.com>
Subject: RE: [PATCH] [SCSI] LIBSAS: fix libsas link error issue

> >> I get the issue like this:
> >> 1. HBA support 3Gbps, level 1 expander support 6Gbps, and level 2
expander
> >> support 6Gbps;
> >> 2. level 1 is fine, and find that level 2 link rate is 6Gbps in
DISCOVER
> command
> >> response.
> >> 3. LIBSAS think level 2 is 6Gbps by sas_ex_get_linkrate function, and
send
> >> command to level 2 expander
> >> 4. LIBSAS link error.
> >>
> >[Jack Wang]
> >What do you mean by "LIBSAS link error", OPEN_REJECT(CONNECTION RATE NOT
> >SUPPORTED)? LIBSAS only get the error event through LLDD.
> >According to SAS2r15 7.8.3
> I mean that HBA get link error. Sorry.
> 
> >A SAS initiator port shall set the initial CONNECTION RATE field to:
> >a) the highest supported connection rate supported by a potential pathway
as
> determined during the
> >discover process (e.g., based on the logical link rates of each logical
link
> reported in the SMP
> >DISCOVER responses); or
> Sas_ex_get_linkrate function
> 
[Jack Wang] 
It's the same, sas_ex_get_linkrate use DISCOVER response as linkrate.

> >b) the logical link rate of the logical phy used to transmit the OPEN
> address frame.
> MVSAS get value of linkrate from sas_ex_get_linkrate
> function(child->linkrate)
> 
> >If a SAS initiator port selected a connection rate based on discover
process
> information but the connection
> >request results in OPEN_REJECT (CONNECTION RATE NOT SUPPORTED), then the
> discover process
> >information is no longer current and the discover process should be run
> again.
> 
> Fail again.
> 
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