[openib-general] multicast.c question

[Sean Hefty]

> There were hard coded values for pkey, qkey, and join state in
> multicast.c.If so, where should these ultimately come from ?

A user specifies the values for the MCMemberRecord when they issue the join 
request, so the user controls all values.  There is a call 
(ib_sa_get_mcmember_rec) that can be used to lookup an existing record, or 
obtain some default values for an MCMemberRecord if the user doesn't care what 
they are.  I believe that the default values are the hard-coded values that 
you're referring to.

The rdma_cm calls ib_sa_get_mcmember_rec() to lookup the broadcast group used by 
ipoib.  It uses the returned MCMemberRecord as a template for creating new 
groups.  The hard-coded values are only there for users that want to create a 
group, and don't care anything about its values.

I hope this makes sense.

- Sean