gnrc/ipv6/nib: Expose configurations to Kconfig

[leandrolanzieri]

Contribution description

This PR moves configuration macros of GNRC NIB module to the CONFIG_ namespace and exposes them to Kconfig. To keep compatibility with boolean macros generated by Kconfig I modified the evaluation of many of them using IS_ACTIVE.

I think there are some cases where the #if could be changed to C conditionals, but as I was not so sure I decided not to change this in general.

Testing procedure

• Examples using this module should still work
• Unittests for the module should still pass
• One should be able to configure NIB using menuconfig interface and it should be reflected on the application

Issues/PRs references

Part of #12888

[miri64]

@leandrolanzieri please rebase.

[leandrolanzieri]

I wrapped lines to 80 chars on files where I was getting the 100 char warning

[miri64]

Mostly style and documentation stuff, as this is just renaming the macros and introduces the Kconfig file. Everything else should be uncovered by Murdock. Please squash immediately. I can't keep track of >20 commits anyways ;-P

[leandrolanzieri]

@miri64 I think I addressed all comments. I squashed directly.

[miri64]

Minor error picked up by Murdock.

[miri64]

While you are fixing this anyway: how about some more warnings about experimental options.

[leandrolanzieri]

Added a fixup to guard all configuration parameters from the header when using Kconfig, so it does not override booleans.

[miri64]

I tested with native and samr21-xpro:

• examples/gcoap to test hosts (standard with native and 6LN with samr21-xpro)
• examples/gnrc_networking to test routers (standard with native and 6LR with samr21-xpro)
• examples/gnrc_border_router to test 6LBRs

Then I pinged both link-local addresses and global addresses. I did this without Kconfig and with Kconfig. To check the configuration with Kconfig, I deactivated router solicitations with examples/gcoap using CONFIG_GNRC_IPV6_NIB_NO_RTR_SOL=1 (which flashed the nice new warning).

It all worked. With the changed configuration the gcoap example did not send any router solicitation (making the global ping impossible on the samr21-xpro, as was expected).

ACK. Please squash your final change.

[miri64]

🎉