[openib-general] some issues related to when/why IPoIB calls netif_carrier_on() etc

[Or Gerlitz]

Roland Dreier wrote:
>  > 1) what is the exact reason that ib0 is running here, is it as of this
>  >    "magic" configuration of the IPv6 addr that caused it to join to
>  >    the IPv4 and IPv6 broascast groups?
> 
> No, ipv6 autoconf has nothing to do with it.  I think it's because you
> did ifconfig ib0 up, which called ipoib_open(), which calls
> ipoib_ib_dev_up(), which joins the ipv4 broadcast group.
> 
> Bringing the interface up the starts ipv6 autoconf but that is just a
> side issue.  You could build a kernel without ipv6 and see what happens.
> 
>  > 2) is it well defined what conditions should hold s.t IPoIB will be RUNNING
> 
> Not really.
> 
>  > 3) just to make sure: RUNNING <--> ipoib called netif_carrier_on(), correct?
>  >    i see that latter is called by ipoib_mcast_join_task(), is it when
>  >    "joining everything we want to join to" holds or you can somehow
>  >    refine the predicate?
> 
> Yes, I believe that is correct.

OK, thanks for all the clarifications.

Or.