[openib-general] [RFC] [PATCH 2/7] ib_multicast 2.6.20: add ib_multicast module to track join requests from the same port

[Eitan Zahavi]

Or Gerlitz wrote:
> Michael S. Tsirkin wrote:
>   
>> Quoting r. Sean Hefty <sean.hefty at intel.com>:
>>     
>>> Add an ib_multicast module to perform reference counting of multicast
>>> join / leave requests.  Modify ib_ipoib to use the multicast module.
>>> Signed-off-by: Sean Hefty <sean.hefty at intel.co
>> On the ipoib change - whya re we doing it at all?
>> ib_ipoib does not actually need the multicast refcounting, does it?
>> I would be worried about doing major changes in ipoib multicast code, at this
>> point.
>>     
>
> The ipoib change is a must to allow for user space consumers to 
> join/leave groups whose MGID is "of IP multicast origin".
>
> So one process can have its IP mulitcast traffic carried out by ipoib 
> and another process can use librdmacm to join the same multicast group 
> and attach a QP to the same MGID.
>   
If the tracking (ref counting) was done at the MAD level - no change to 
IPoIB would have been required ...
> Or.
>
>
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