linux-kernel - Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY

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Message-ID: <yq1y52lnyyf.fsf@sermon.lab.mkp.net>
Date:	Sun, 12 Jan 2014 07:53:28 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Sagi Grimberg <sagig@....mellanox.co.il>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Oren Duer <oren@...lanox.com>
Subject: Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16

>>>>> "Sagi" == Sagi Grimberg <sagig@....mellanox.co.il> writes:

>> Per SBC, PI must be initialized to 0xffffffffffffffff. Since an app
>> tag value of 0xffff is an escape, this will prevent both target and
>> initiator from performing PI-verification when that block is read.

Sagi> OK, so this is an implicit escape (which will become explicit in
Sagi> DIX1.1?). So I will open that in DIF RDMA verbs.

DIX 1.0 says:

"If a storage device returns a value of 0xFFFF in the application tag
and the device is formatted with T10 PI Type 1 or 2 protection, the I/O
controller must disable integrity checking for that sector."

In DIX 1.1 it is explicit by way of the DIX_APP_ESCAPE flag.

-- 
Martin K. Petersen	Oracle Linux Engineering
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