Hangbin,

On Sat, Sep 29, 2018 at 05:16:05PM +0800, Hangbin Liu wrote:
[...]

quoted

Is it desirable to switch to a flag? If I read geneve_changelink() and
geneve_nl2info() correctly, it allows you to set the ttl_inherit flag
for an existing device but doesn't allow you to clear it. With NLA_U8,
you could distinguish three cases: set the flag (non-zero value), clear
the flag (zero value) and preserve current state (attribute not
present).

I re-read geneve_changelink() and I agree with you. Since we can change ttl
number, we should also be able to set/unset ttl inherit.

Phil, what do you think?

All fine with me. I'm not familiar with either of VXLAN or Geneve,
you're the experts here. I was just the random guy wondering why things
are done one way and not the other. :)

Thanks for your diligent efforts at clearing up the mysteries!

Cheers, Phil