linux-kernel - Re: [PATCH 08/10] mpt3sas: set EEDP-escape-flags for SAS35 devices.

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Message-ID: <c0339732-87af-9dac-c65e-2da94396a3a8@redhat.com>
Date:   Tue, 25 Oct 2016 16:42:51 +0200
From:   Tomas Henzl <thenzl@...hat.com>
To:     Suganath Prabu S <suganath-prabu.subramani@...adcom.com>,
        JBottomley@...allels.com, jejb@...nel.org, hch@...radead.org
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        Sathya.Prakash@...adcom.com, kashyap.desai@...adcom.com,
        krishnaraddi.mankani@...adcom.com, linux-kernel@...r.kernel.org,
        chaitra.basappa@...adcom.com, sreekanth.reddy@...adcom.com
Subject: Re: [PATCH 08/10] mpt3sas: set EEDP-escape-flags for SAS35 devices.

On 20.10.2016 14:20, Suganath Prabu S wrote:
> An UNMAP command on a PI formatted device will leave the Logical Block
> Application Tag and Logical Block Reference Tag as all F's (for those LBAs
> that are unmapped). To avoid IO errors if those LBAs are subsequently read
> before they are written with valid tag fields, the MPI SCSI IO requests
> need to set the EEDPFlags element EEDP Escape Mode field, Bits [7:6]
> appropriately. A value of 2 should be set to disable all PI checks if the
> Logical Block Application Tag is 0xFFFF for PI types 1 and 2.  A value
> of 3 should be set to disable all PI checks if the Logical Block
> Application Tag is 0xFFFF and the Logical Block Reference Tag is
> 0xFFFFFFFF for PI type 3.
>
> Signed-off-by: Chaitra P B <chaitra.basappa@...adcom.com>
> Signed-off-by: Sathya Prakash <sathya.prakash@...adcom.com>
> Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@...adcom.com>

Reviewed-by: Tomas Henzl <thenzl@...hat.com>

Tomas