Re: Xenomai RTnet - Kernel module not loading

[Per Oberg <pero@wolfram.com>]

----- Den 25 feb 2020, på kl 15:44, Per Öberg pero@wolfram.com skrev:

> ----- Den 25 feb 2020, på kl 15:24, Benji miethben@b-tu.de skrev:

> > On 2/25/20 3:11 PM, Per Oberg wrote:

> > > ----- Den 25 feb 2020, på kl 15:02, xenomai xenomai@xenomai.org skrev:

> > >> Hello all,

> > >> I'm a student working on a project comparing different real time OS
> > >> approaches. Trying to get RTnet working on a Xenomai Cobalt kernel, but
> > >> stuck on loading required kernel modules.

> > >> System is running on Ubuntu 18.04 and uses following versions to build
> > >> Xenomai kernel:

> > >> Linux Kernel: 4.19.89
> > >> IPIPE: 4.19.89
> > >> Xenomai: 3.1

> > >> Kernel is build as described in Xenomai wiki and configured with RTnet
> > >> as kernel module.

> > >> After installing xenomai kernel and checking the module, everything
> > >> looks ok.

> > >>> $ sudo modinfo /lib/modules/4.19.89/kernel/drivers/xenomai/net/stack/rtnet.ko
> > >>> filename: /lib/modules/4.19.89/kernel/drivers/xenomai/net/stack/rtnet.ko
> > >>> description: RTnet stack core
> > >>> license: GPL
> > >>> srcversion: E1B65CA6F28C7B08C111720
> > >>> depends:
> > >>> retpoline: Y
> > >>> intree: Y
> > >>> name: rtnet
> > >>> vermagic: 4.19.89 SMP mod_unload
> > >>> signat: PKCS#7
> > >>> signer:
> > >>> sig_key:
> > >>> sig_hashalgo: md4
> > >>> parm: stack_mgr_prio:Priority of the stack manager task (uint)
> > >>> parm: socket_rtskbs:Default number of realtime socket buffers in socket pools
> > >>> (uint)
> > >>> parm: global_rtskbs:Number of realtime socket buffers in global pool (uint)
> > >>> parm: device_rtskbs:Number of additional global realtime socket buffers per
> > >>> network adapter (uint)

> > >> But kernel module can't be loaded.

> > >>> $ sudo insmod /lib/modules/4.19.89/kernel/drivers/xenomai/net/stack/rtnet.ko
> > >>> insmod: ERROR: could not insert module
> > >>> /lib/modules/4.19.89/kernel/drivers/xenomai/net/stack/rtnet.ko: Function not
> > >>> implemented

> > >> Has anybody a hint how to build/ load RTnet kernel module properly?

> >> Can you load any other modules? Did you include "loadable module support" in
> > > your kernel config?

> > > If you do a simple "lsmod", does it say anything about other loaded modules ?

> > >> Thanks
> > >> Benji

> > > Per Öberg

> > Loading other modules is possible. But rtnet is not listed as a loadable
> > module, see below.
> > In kernel config 'MODULE_UNLOAD' and 'MODULES' are set.

> > > Module Size Used by
> > > snd_hda_codec_hdmi 49152 1
> > > snd_hda_codec_realtek 110592 1
> > > snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
> > > rfcomm 69632 16
> > > cmac 16384 1
> > > bnep 20480 2
> > > intel_rapl 20480 0
> > > x86_pkg_temp_thermal 16384 0
> > > intel_powerclamp 16384 0
> > > coretemp 16384 0
> > > arc4 16384 2
> > > i915 1703936 6
> > > iwlmvm 372736 0
> > > mac80211 786432 1 iwlmvm
> > > kvm_intel 184320 0
> > > kvm 622592 1 kvm_intel
> > > iwlwifi 303104 1 iwlmvm
> > > cec 49152 1 i915
> > > rc_core 45056 1 cec
> > > drm_kms_helper 167936 1 i915
> > > snd_hda_intel 40960 3
> > > ...

> Then I would say that you have a mismatch between the versioning information in
> your module and kernel build. Are they built together or separately?

> Can you please provide information from "uname -a" and "cat /proc/version" ?

> > Thanks
> > Benji

> Best regards
> Per Öberg

Oh, and have you tried using "sudo modprobe rtnet". This command is a bit smarter and loads all the dependencies. (It looks in modules.dep that is generated by "depmod -a")

If there are missing dependencies you should get a warning of you run "depmod -a"

Per Öberg