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Message-ID: <F766E4F80769BD478052FB6533FA745D19FAE66D88@SC-VEXCH4.marvell.com>
Date: Wed, 15 Jun 2011 23:37:41 -0700
From: Xiangliang Yu <yuxiangl@...vell.com>
To: Jack Wang <jack_wang@...sh.com>,
'James Bottomley' <James.Bottomley@...senPartnership.com>
CC: "yxlraid@...il.com" <yxlraid@...il.com>,
"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
"maciej.trela@...el.com" <maciej.trela@...el.com>,
"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Jacky Feng <jfeng@...vell.com>
Subject: RE: [PATCH] [SCSI] LIBSAS: fix libsas link error issue
> >[Jack Wang]
> >I don't think the statement below is error:
> >child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
The parent_phy is same to child_phy, I don't think it's right.
>> Yes, you can test like this.
>> >Then expander1's linkrate will set to 3G, and expander2's linkrate will
set
>> >to 6G, that is correct.
>> yes
>> > But the connection rate will be 3G from hba to
>> >expander2.
>> How to configure the connection rate?
>> Now, MVSAS driver get 6G from sas_ex_get_linkrate function, and set
linkrate
>> of OPEN address frame to the value. right?
>>
>> --
>[Jack Wang]
>Connection rate is auto, link layer will insert deletable primitives to do
>rate matching (sas2r15 7.14).
>Yes, you should set the linkrate to that value .
OK.MVSAS driver seem right. But, the problem is command fail because of link error, that is why I commit this patch. And my patch work fine.
You can reproduce the issue and fix it. Thanks!
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