From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758571AbcJYOm4 (ORCPT ); Tue, 25 Oct 2016 10:42:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38080 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753640AbcJYOmy (ORCPT ); Tue, 25 Oct 2016 10:42:54 -0400 Subject: Re: [PATCH 08/10] mpt3sas: set EEDP-escape-flags for SAS35 devices. To: Suganath Prabu S , JBottomley@Parallels.com, jejb@kernel.org, hch@infradead.org References: <1476966018-10457-1-git-send-email-suganath-prabu.subramani@broadcom.com> <1476966018-10457-9-git-send-email-suganath-prabu.subramani@broadcom.com> Cc: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, Sathya.Prakash@broadcom.com, kashyap.desai@broadcom.com, krishnaraddi.mankani@broadcom.com, linux-kernel@vger.kernel.org, chaitra.basappa@broadcom.com, sreekanth.reddy@broadcom.com From: Tomas Henzl Message-ID: Date: Tue, 25 Oct 2016 16:42:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <1476966018-10457-9-git-send-email-suganath-prabu.subramani@broadcom.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Tue, 25 Oct 2016 14:42:54 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > Signed-off-by: Sathya Prakash > Signed-off-by: Suganath Prabu S Reviewed-by: Tomas Henzl Tomas