Re: [PATCH for-4.3] IB/ipoib: add module option for auto-creating mcast groups

On 09/11/2015 02:21 PM, Jason Gunthorpe wrote:

On Fri, Sep 11, 2015 at 09:40:25AM -0500, Christoph Lameter wrote:

quoted

On Thu, 10 Sep 2015, Doug Ledford wrote:

quoted

+		 * 1) ifdown/ifup
+		 * 2) a regular mcast join/leave happens and we run
+		 *    ipoib_mcast_restart_task
+		 * 3) a REREGISTER event comes in from the SM
+		 * 4) any other event that might cause a mcast flush

Could we have a timeout and leave the multicast group on process
exit?

At a minimum, when the socket that did the send closes the send-only
could be de-refed..

If we kept a ref count, but we don't.  Tracking this is not a small change.

But really send-only in IB is very similar to neighbour discovery, and
should work the same, with a timer, etc. In my mind it would be ideal
to even add them to the ND table, if the core would support that..

Jason
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