linux-kernel - Re: [PATCH] scsi: libiscsi: select CRYPTO_HASH for ISCSI

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Date:   Fri, 15 Oct 2021 15:54:34 +0200
From:   Vegard Nossum <vegard.nossum@...cle.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: libiscsi: select CRYPTO_HASH for ISCSI_TCP


On 10/15/21 3:36 PM, Herbert Xu wrote:
> On Fri, Oct 15, 2021 at 03:11:15PM +0200, Vegard Nossum wrote:
>> Fix the following build/link error by adding a dependency on CRYPTO_HASH:
>>
>>   ld: drivers/scsi/libiscsi_tcp.o: in function `iscsi_tcp_dgst_header':
>>   libiscsi_tcp.c:(.text+0x237): undefined reference to `crypto_ahash_digest'
>>   ld: drivers/scsi/libiscsi_tcp.o: in function `iscsi_tcp_segment_done':
>>   libiscsi_tcp.c:(.text+0x1325): undefined reference to `crypto_ahash_final'
>>
>> Fixes: 5d6ac29b9ebf2 ("iscsi_tcp: Use ahash")
>> Cc: Herbert Xu <herbert@...dor.apana.org.au>
>> Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
>> ---
>>  drivers/scsi/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
>> index 6e3a04107bb65..09764f3c42447 100644
>> --- a/drivers/scsi/Kconfig
>> +++ b/drivers/scsi/Kconfig
>> @@ -290,6 +290,7 @@ config ISCSI_TCP
>>  	tristate "iSCSI Initiator over TCP/IP"
>>  	depends on SCSI && INET
>>  	select CRYPTO
>> +	select CRYPTO_HASH
>>  	select CRYPTO_MD5
>>  	select CRYPTO_CRC32C
>>  	select SCSI_ISCSI_ATTRS
> 
> CRYPTO_MD5 already selects CRYPTO_HASH so this shouldn't be needed.

You're right, my apologies.

libiscsi_tcp.o is built for CONFIG_ISCSI_TCP, but it's _also_ built for
CONFIG_SCSI_CXGB3_ISCSI and CONFIG_SCSI_CXGB4_ISCSI. I missed that when
I looked at the Makefile and wrongly assumed that CONFIG_ISCSI_TCP was
missing the select.

I'm not sure what the right fix here would be -- should
CONFIG_SCSI_CXGB[34]_ISCSI depend on CONFIG_ISCSI_TCP..? Or should we
add those CRYPTO* selects in there as well?


Vegard