[ofa-general] Re: [PATCH RFC v2] IB/ipoib: enable IGMP for userpsace multicast IB apps

[Roland Dreier]

 > Since both the rdma-cm and ipoib are consumers of the core mutlicast
 > management code (core/multicast.c which is linked into ib_sa.ko), and the
 > app (through the rdma-cm) --first--  inserts a record into the database and
 > only then issues the setsockopt call, if ipoib has a hit on a group it was
 > told to join, this group must be offloaded by the rdma-cm consumer.

I'm not sure I understand why that follows.  Couldn't there be some
other kernel or userspace entity that caused the record to be added?

 > The per device flag is initialized by the module param value at
 > ipoib_dev_init()

I still don't really get why there's a module parameter to set the
initial value of a flag that only root can change anyway.  Why not
just the flag through sysfs after loading ipoib rather than having a
module parameter to do the same thing?

 - R.