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From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: John Garry <john.garry@huawei.com>
Cc: <jejb@linux.vnet.ibm.com>, <martin.petersen@oracle.com>,
	<linuxarm@huawei.com>, <john.garry2@mail.dcu.ie>,
	<linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<zhangfei.gao@linaro.org>
Subject: Re: [PATCH 0/3] hisi_sas: device id/IPTT collision workaround
Date: Fri, 15 Apr 2016 16:56:27 -0400	[thread overview]
Message-ID: <yq1ega6pp50.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <1460727398-102091-1-git-send-email-john.garry@huawei.com> (John Garry's message of "Fri, 15 Apr 2016 21:36:35 +0800")

>>>>> "John" == John Garry <john.garry@huawei.com> writes:

John> This patchset introduces a workaround to a hw quirk in the
John> HiSilicon SAS controller v2 hw.

John> The quirk is as follows: When a SATA and SAS frame arrives at the
John> host at the same time the frames may be swapped under this
John> condition: SATA device id bit [10:0] == SAS frame IPTT bit [10:0]
John> The workaround is to ensure these 2 values never match. The
John> workaround algorithm is as follows: - SATA device id bit0 always 0
John> - SATA IPTT has no restriction - SAS IPTT bit0 always 1 - SAS
John> device id has no restriction

John> The major restriction of this workaround is the SAS IPTT range is
John> halved, but this should be ok as testing has shown that even using
John> half the IPTT range does not affect performance.

Applied to 4.7/scsi-queue.

Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

      parent reply	other threads:[~2016-04-15 20:56 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-15 13:36 John Garry
2016-04-15 13:36 ` [PATCH 1/3] hisi_sas: add device and slot alloc hw methods John Garry
2016-04-15 13:51   ` Hannes Reinecke
2016-04-15 13:36 ` [PATCH 2/3] hisi_sas: add slot_index_alloc_quirk_v2_hw() John Garry
2016-04-15 13:51   ` Hannes Reinecke
2016-04-15 13:36 ` [PATCH 3/3] hisi_sas: add alloc_dev_quirk_v2_hw() John Garry
2016-04-15 13:52   ` Hannes Reinecke
2016-04-15 20:56 ` Martin K. Petersen [this message]

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