[openib-general] [PATCH] [RFC] librdmacm: expose device list to users

[Sean Hefty]

>Yes, that's what I've been doing, though you recommended using the RDMA
>CM to set up multicast groups.  What interface should I be using then?

That's the problem.  There is no raw userspace SA query interface.  The only
other alternative is to send MADs directly to the SA through the SA MAD
interface, but doing so would bypass the kernel ib_multicast module which is
responsible for tracking multicast join / leave requests.  (In fact, the
userspace MAD interface should eventually prevent a userspace app from sending
raw join/leave requests.)

Are you trying to have each port join the same multicast group?  Are you trying
to join the same multicast group multiple times from the same port?  How are you
determining the multicast group parameters?  And who creates the multicast
group?

- Sean