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

[Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

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On 09/11/2015 02:21 PM, Jason Gunthorpe wrote:
> On Fri, Sep 11, 2015 at 09:40:25AM -0500, Christoph Lameter wrote:
>> On Thu, 10 Sep 2015, Doug Ledford wrote:
>>
>>> +		 * 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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-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
              GPG KeyID: 0E572FDD



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