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

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Date:   Fri, 15 Oct 2021 10:03:14 -0700
From:   Chris Leech <cleech@...hat.com>
To:     Vegard Nossum <vegard.nossum@...cle.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Lee Duncan <lduncan@...e.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 Fri, Oct 15, 2021 at 6:54 AM Vegard Nossum <vegard.nossum@...cle.com> wrote:
>
>
> 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?

(apologies for the HTML reply that got rejected by the lists, and the
double reply to those directly addressed)

Are  Kconfig entries for libiscsi and libiscsi_tcp needed to handle
this properly?  Currently they're added to the object lists with each
configured driver that requires them.  I'm not even sure what happens
if you manage to configure them into both obj-y and obj-m.

- Chris Leech