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

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Date:	Thu, 9 Jan 2014 12:24:43 +0200
From:	Sagi Grimberg <sagig@...lanox.com>
To:	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>
CC:	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 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16

On 1/8/2014 10:36 PM, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@...ux-iscsi.org>
>
> This patch updates sbc_emulate_readcapacity_16() to set
> P_TYPE and PROT_EN bits when DIF emulation is enabled by
> the backend device.
>
> Cc: Martin K. Petersen <martin.petersen@...cle.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Hannes Reinecke <hare@...e.de>
> Cc: Sagi Grimberg <sagig@...lanox.com>
> Cc: Or Gerlitz <ogerlitz@...lanox.com>
> Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
> ---
>   drivers/target/target_core_sbc.c |    5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
> index 366b9bb..22599e8 100644
> --- a/drivers/target/target_core_sbc.c
> +++ b/drivers/target/target_core_sbc.c
> @@ -106,6 +106,11 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
>   	buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
>   	buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
>   	buf[11] = dev->dev_attrib.block_size & 0xff;
> +	/*
> +	 * Set P_TYPE and PROT_EN bits for DIF support
> +	 */
> +	if (dev->dev_attrib.pi_prot_type)
> +		buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
>   
>   	if (dev->transport->get_lbppbe)
>   		buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;

Hey Nic,

What about FORMAT_UNIT emulation?
The backstore protection configuration is done at the target side via 
configfs/targetcli, if you publish DIF support in 
INQUERY_EVPD/READ_CAPACITY you need to accept protection information format?
Did I miss that one? or is it still under WIP?

Sagi.
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