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

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Date:	Thu, 09 Jan 2014 22:21:31 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
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>
Subject: Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to
 READ_CAPACITY_16

On Thu, 2014-01-09 at 12:24 +0200, Sagi Grimberg wrote:
> 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?

Would certainly be useful to have..

> 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?

Mmmm, these two bits bits are following what scsi_debug is currently
exposing minus FORMAT_UNIT support..?

MKP..?

--nab

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