linux-kernel - Re: [PATCH 09/14] target/configfs: Expose protection device attributes

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Date:	Sun, 12 Jan 2014 14:18:15 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"Nicholas A. Bellinger" <nab@...erainc.com>
CC:	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>,
	Sagi Grimberg <sagig@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 09/14] target/configfs: Expose protection device attributes

<SNIP>

> nab> This patch adds support for exposing DIF protection device
> nab> attributes via configfs.  This includes:
>
> nab>    pi_prot_type: Protection Type (0, 1, 3 currently support)
> nab>    pi_prot_version: Protection Version (DIF v1 currently supported)
>
> What's DIF v2?
>
> nab>    pi_guard_type: Guard Type (1=DIF CRC, 2=IP CRC)
>
> The IP checksum is only supported by DIX between OS and initiator, not
> by the target. I guess we could signal to the initiator via a
> vendor-private VPD that IP checksum is supported directly. But now what
> we have hardware-accelerated T10 CRC I don't think it's a big deal.

shouldn't it stick around if it is not deprecated yet, the transport is 
required to support ip-csum->CRC conversion anyhow.

> (scsi_debug supports IP checksum because it's both initiator and
> target).
>


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