Improve build & installation + support kernels 5.13+

[warnes]

• Use standard kernel module build & install tools, including module signing.
• Add modprobe configuration script
• Rename module 'bladeRF-mac80211-hwsim' to distinguish it from the standard 'mac80211-hwsim' module.
• Includes PR Fix compilation on 5.13+ kernels #1

[alphafox02]

Exactly what I've been looking for! Excellent. Just compiled on 2.04 w/ 5.13 kernel. This will allow me to do some upgrades I've been wanting to do.

[alphafox02]

I may have missed this, but after looking closer I notice with the 5.13.0.35 Kernel I'm getting the following result when running make. This is on 20.04 w/ HWE kernel.

dragon@dragon:~/bladeRF-mac80211_hwsim$ make
make -C /lib/modules/5.13.0-35-generic/build M=$PWD
make[1]: Entering directory '/usr/src/linux-headers-5.13.0-35-generic'
  CC [M]  /home/dragon/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.o
  MODPOST /home/dragon/bladeRF-mac80211_hwsim/Module.symvers
  CC [M]  /home/dragon/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.mod.o
  LD [M]  /home/dragon/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.ko
  BTF [M] /home/dragon/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.ko
Skipping BTF generation for /home/dragon/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.ko due to unavailability of vmlinux
make[1]: Leaving directory '/usr/src/linux-headers-5.13.0-35-generic'

If I try to insmod the .ko file I end up with this,

insmod: ERROR: could not insert module bladeRF_mac80211_hwsim.ko: Unknown symbol in module

Doing some searching to see how to get around the initial issue.

[alphafox02]

The following occurs while trying to build against the kernel mentioned on a Pi4

sudo make -C /lib/modules/5.15.43-v8+/build M=$PWD make: Entering directory '/usr/src/linux-headers-5.15.43-v8+' CC [M] /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.o /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c: In function ‘hwsim_new_radio_nl’: /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:3539:23: error: ‘CFG80211_MAX_NUM_DIFFERENT_CHANNELS’ undeclared (first use in this function) 3539 | if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:3539:23: note: each undeclared identifier is reported only once for each function it appears in /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c: In function ‘init_mac80211_hwsim’: /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:4009:21: warning: this statement may fall through [-Wimplicit-fallthrough=] 4009 | param.reg_strict = true; | ~~~~~~~~~~~~~~~~~^~~~~~ /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:4011:3: note: here 4011 | case HWSIM_REGTEST_DRIVER_REG_ALL: | ^~~~ make[1]: *** [scripts/Makefile.build:288: /home/ubuntu/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.o] Error 1 make: *** [Makefile:1868: /home/ubuntu/bladeRF-mac80211_hwsim] Error 2 make: Leaving directory '/usr/src/linux-headers-5.15.43-v8+'
A quick search turned this up, but to be honest maybe it's just this custom kernel/config I'm trying. Commenting out the few lines starting at 3539 allow it to compile.

https://patches.linaro.org/project/linux-wireless/patch/20210506221159.d1d61db1d31c.Iac4da68d54b9f1fdc18a03586bbe06aeb9515425@changeid/

[alphafox02]

On Lubuntu 22.04 w/ kernel 5.15.0-52-generic I get the following while trying to compile

/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c: In function ‘hwsim_new_radio_nl’:
/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:3539:30: error: ‘CFG80211_MAX_NUM_DIFFERENT_CHANNELS’ undeclared (first use in this function)
 3539 |         if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:3539:30: note: each undeclared identifier is reported only once for each function it appears in
/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c: In function ‘init_mac80211_hwsim’:
/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:4009:42: warning: this statement may fall through [-Wimplicit-fallthrough=]
 4009 |                         param.reg_strict = true;
      |                         ~~~~~~~~~~~~~~~~~^~~~~~
/usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.c:4011:17: note: here
 4011 |                 case HWSIM_REGTEST_DRIVER_REG_ALL:
      |                 ^~~~
make[2]: *** [scripts/Makefile.build:297: /usr/src/wiphy-build/bladeRF-mac80211_hwsim/bladeRF_mac80211_hwsim.o] Error 1
make[1]: *** [Makefile:1900: /usr/src/wiphy-build/bladeRF-mac80211_hwsim] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-52-generic'
make: *** [Makefile:26: default] Error 2

Commented out the lines starting at 3539, compiles afterwards.

[alphafox02]

The following steps while using your PR works for me.

#6