linux-kernel - Re: [PATCH 13/14] target/rd: Add DIF protection into rd_execute

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Message-ID: <yq11u0fr1gr.fsf@sermon.lab.mkp.net>
Date:	Fri, 10 Jan 2014 16:06:28 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Sagi Grimberg <sagig@...lanox.com>
Cc:	"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>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 13/14] target/rd: Add DIF protection into rd_execute_rw

>>>>> "Sagi" == Sagi Grimberg <sagig@...lanox.com> writes:

Sagi> I wander how we can skip sbc_dif_verify_xxxx if the transport
Sagi> already offloaded DIF verify.  I think that the transport should
Sagi> signal the core layer that it is able to offload DIF
Sagi> (ADD/STRIP/PASS/VERIFY), in which case the core should turn off
Sagi> the backstore DIF verify emulation to sustain performance.

Yeah, for SAS and FC it would be nice to leverage DIX and let the ASIC
do the actual checking and splitting. I assume the same is true for your
hw.

-- 
Martin K. Petersen	Oracle Linux Engineering
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