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Bug 804933 - sys-block/targetcli-fb wants target_core_mod which wants crc_t10dif kernel module
Summary: sys-block/targetcli-fb wants target_core_mod which wants crc_t10dif kernel mo...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal normal (vote)
Assignee: No maintainer - Look at if you want to take care of it
Depends on:
Reported: 2021-07-29 01:48 UTC by Stefan Prostler
Modified: 2022-02-06 11:26 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---

kernel_config (kcon,130.88 KB, text/plain)
2021-07-29 01:51 UTC, Stefan Prostler

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Description Stefan Prostler 2021-07-29 01:48:17 UTC
Starting targetcli-fb breaks with unknown parameter in target_core_mod.
Kernel configuration like in
Asking for crc_t10dif.
Trying to resolve especially a logic behind 

SCSI_LPFC [=m] && SCSI_LOWLEVEL [=y] && PCI [=y] && SCSI [=y] && CPU_FREQ [=y] && SCSI_FC_ATTRS [=m] && (NVME_TARGET_FC [=n] || NVME_TARGET_FC [=n]=n) && ( NVME_FC [=m] || NVME_FC [=m]=n)

in kernel config

Reproducible: Always

Steps to Reproduce:
1. emerge targetcli-fb
2. select kernel modules from
3. run targetcli
4. get dmesg

Actual Results:  
abenakit /usr/src/linux # targetcli
b"modprobe: ERROR: could not insert 'target_core_mod': Unknown symbol in module, or unknown parameter (see dmesg)\n"
abenakit /usr/src/linux # dmesg | tail -n 2
[ 9383.623134] target_core_mod: Unknown symbol crc_t10dif (err -2)
[ 9383.623273] target_core_mod: Unknown symbol crc_t10dif_update (err -2)

Expected Results:  
targetcli runs (&& / ||) modprobe target_core_mod loads (&& / ||) kernel parameter CONFIG_CRC_T10DIF
 (NVME_TARGET_FC [=n] || NVME_TARGET_FC [=n]=n) &&  ( NVME_FC [=m] || NVME_FC [=m]=n)

can be configured to make CONFIG_CRC_T10DIF: a known symbol in the target_core_mod

I am not sure where to post this if this is a kernel topic or a targetcli-fb.
I dont need the FibreChannel Drivers neither the nvme but somehow the module seems to depend on them.
Or maybe I am just missing out on an easy way to configure this set of the kernel sources.
Comment 1 Stefan Prostler 2021-07-29 01:51:52 UTC
Created attachment 727569 [details]

annex kernel config
Comment 2 Jonas Stein gentoo-dev 2021-07-30 20:51:41 UTC
It is sad to read that you have problems with the software. The situation seems to be a bit more complicate and requires some analysis.

I have had very good experience on the gentoo IRC [1] with questions like this. Of course there are also forums and mailing lists [2,3].
I asssigned the ticket, please try to find out more details on one of the mentioned channels [4] and report the important findings here.

Comment 3 Stefan Prostler 2021-07-31 03:23:22 UTC
Thanks I will try there.
I gave genkernel a run and it is definetly a problem on my understanding of the kernel config. With genkernel the modules are compiled and I am able to start targetcli as the target_core modules loads also the t10_dif.
So it is _not_ a bug.
Sorry for bringing it up here.
If you want to close this issue feel free. 

Anyhow as soon as I know which param is blocking the selection of the t10_dif module I will post it here if anybody else runs into this and/or confusion.
Comment 4 Jonas Stein gentoo-dev 2022-02-06 11:26:19 UTC
Hi Stefan, could you find out more so that we can fix/close this one?