linux-kernel - Re: [RFC 12/12] iscsi-target: Add Makefile/Kconfig and update TCM top level

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Date:	Wed, 2 Mar 2011 14:45:29 -0800 (PST)
From:	"Randy Dunlap" <rdunlap@...otime.net>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	"Randy Dunlap" <rdunlap@...otime.net>,
	"linux-scsi" <linux-scsi@...r.kernel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Christoph Hellwig" <hch@....de>,
	"Mike Christie" <michaelc@...wisc.edu>,
	"Hannes Reinecke" <hare@...e.de>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	"James Bottomley" <james.bottomley@...senpartnership.com>,
	"Boaz Harrosh" <bharrosh@...asas.com>,
	"Stephen Rothwell" <sfr@...b.auug.org.au>,
	"Douglas Gilbert" <dgilbert@...erlog.com>
Subject: Re: [RFC 12/12] iscsi-target: Add Makefile/Kconfig and update TCM 
     top level


On Wed, March 2, 2011 1:32 pm, Nicholas A. Bellinger wrote:
> On Tue, 2011-03-01 at 22:32 -0800, Randy Dunlap wrote:
>
>> On Tue,  1 Mar 2011 19:34:01 -0800 Nicholas A. Bellinger wrote:
>>
>>
>>> From: Nicholas Bellinger <nab@...ux-iscsi.org>
>>>
>>>
>>> Add Makefile/Kconfig and update drivers/target/[Makefile,Kconfig]
>>> to include the fabric module.
>>>
>>> igned-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
>>> ---
>>> drivers/target/Kconfig        |    1 + drivers/target/Makefile       |
>>> 1 +
>>> drivers/target/iscsi/Kconfig  |   17 +++++++++++++++++
>>> drivers/target/iscsi/Makefile |   20 ++++++++++++++++++++ 4 files
>>> changed, 39 insertions(+), 0 deletions(-) create mode 100644
>>> drivers/target/iscsi/Kconfig create mode 100644
>>> drivers/target/iscsi/Makefile
>>>
>>> diff --git a/drivers/target/Kconfig b/drivers/target/Kconfig index
>>> 387d293..798749a 100644
>>> --- a/drivers/target/Kconfig
>>> +++ b/drivers/target/Kconfig
>>> @@ -30,5 +30,6 @@ config TCM_PSCSI
>>> passthrough access to Linux/SCSI device
>>>
>>> source "drivers/target/tcm_loop/Kconfig" +source
>>> "drivers/target/iscsi/Kconfig"
>>>
>>>
>>> endif diff --git a/drivers/target/Makefile b/drivers/target/Makefile
>>> index 60028fe..b038b7d 100644 --- a/drivers/target/Makefile
>>> +++ b/drivers/target/Makefile
>>> @@ -24,3 +24,4 @@ obj-$(CONFIG_TCM_PSCSI)		+= target_core_pscsi.o
>>>
>>>
>>> # Fabric modules
>>> obj-$(CONFIG_TCM_LOOP_FABRIC)	+= tcm_loop/ +obj-$(CONFIG_ISCSI_TARGET)
>>> += iscsi/
>>> diff --git a/drivers/target/iscsi/Kconfig
>>> b/drivers/target/iscsi/Kconfig new file mode 100644 index
>>> 0000000..d1eaec4
>>> --- /dev/null
>>> +++ b/drivers/target/iscsi/Kconfig
>>> @@ -0,0 +1,17 @@
>>> +config ISCSI_TARGET
>>> +	tristate "Linux-iSCSI.org iSCSI Target Mode Stack"
>>> +	select CRYPTO
>>> +	select CRYPTO_CRC32C
>>> +	select CRYPTO_CRC32C_INTEL
>>>
>>
>> CRYPTO_CRC32C_INTEL depends on X86.  so is ISCSI_TARGET only for X86,
>> or is this kconfig just mucked up?
>>
>>
>
> Hi Randy,
>
>
> The kernel code itself that is specific to using the SSE v4.2
> instruction for CRC32C offload are using #ifdef CONFIG_X86 stubs in
> iscsi_target_login.c:iscsi_login_setup_crypto(), and !CONFIG_X86 will
> default to using the unoptimized 1x8 slicing soft CRC32C code.  This
> particular piece of logic has been tested on powerpc and arm and is
> funcitoning as expected from the kernel level using the arch independent
> soft code.
>
> On the kbuild side, I do see the following warning on !CONFIG_X86:
>
>
> warning: (LIO_TARGET) selects CRYPTO_CRC32C_INTEL which has unmet direct
> dependencies (CRYPTO && X86)

Ah, good.

> I looking at trying to fix this at one point, but was unable to
> determine a method for adding a CONFIG_$ARCH condition to an individual
> 'select BAR' section of 'config FOO'..
>
>
> How would you recommend handling this case..?

How about

        select CRYPTO_CRC32C_INTEL if X86

(with s/spaces/tab/)


-- 
~Randy

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