[openib-general] ipoib ipv6 multicast joins, was: multicast code/merge status

[Michael S. Tsirkin]

> Quoting Sean Hefty <mshefty at ichips.intel.com>:
> Subject: ipoib ipv6 multicast joins, was: multicast code/merge status
> 
> Hal Rosenstock wrote:
> >>(*) there are some more issues here which need to be addressed, see
> >>for example the "Some SMs don't support send-only yet" weird comment
> >>at ipoib_mcast_sendonly_join()
> > 
> > 
> > It's more likely an SA issue but I'm only guessing... It may also be
> > historical...
> 
> Based on observation, it looks like ipoib joins a couple of IPv6 multicast 
> groups with send only membership.  However it changes the join_state from 4 to 1 
> (send-only to full member).  This results in the SA trying to create the 
> multicast group, only the required MCMemberRecord components have not been set.
> 
> I'm not sure if this indicates a serious problem, but I'm guessing not.  The 
> join request simply fails and returns an error back to ipoib.  (Which would have 
> happened for a send-only join if the group hadn't already been created.)

So, this looks like a work-around for some broken SM, does it not?

-- 
MST