[openib-general] Re: ipoib send-only vs full join

[Roland Dreier]

    Sean> When does ipoib join a multicast group for send and receive
    Sean> membership?  It looks like it joins the broadcast group for
    Sean> send/receive, but all other groups are send-only.  Is this
    Sean> correct?

Not quite.  It joins for receive when the networking core asks it to
receive multicasts on a given group.  It joins send-only when it has a
packet to send for a group it hasn't joined yet.

 - R.