linux-kernel - Re: [PATCH V4 03/11] megaraid_sas: EEDP Escape Mode Support for SAS3.5 Generic Megaraid Controllers

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Date:   Thu, 8 Dec 2016 16:35:34 +0100
From:   Tomas Henzl <thenzl@...hat.com>
To:     Sasikumar Chandrasekaran <sasikumar.pc@...adcom.com>,
        jejb@...nel.org, hch@...radead.org
Cc:     linux-scsi@...r.kernel.org, Sathya.Prakash@...adcom.com,
        linux-kernel@...r.kernel.org, christopher.owens@...adcom.com,
        kiran-kumar.kasturi@...adcom.com
Subject: Re: [PATCH V4 03/11] megaraid_sas: EEDP Escape Mode Support for
 SAS3.5 Generic Megaraid Controllers

On 7.12.2016 00:00, Sasikumar Chandrasekaran 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.
>
> This patch is depending on patch 2
>
> Signed-off-by: Sasikumar Chandrasekaran <sasikumar.pc@...adcom.com>

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

Tomas