[Bug 1422002] [NEW] RoCE mckey hangs in Ubuntu 15.04 (Mellanox)

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---Problem Description---
mckey test hangs in RoCE. 
It does not receive the multicast packets. 
 
---uname output---
Linux powerio-le21 3.18.0-12-generic #13-Ubuntu SMP Thu Jan 29 13:44:26 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
 
---Additional Hardware Info---
Need RoCE adapter like Mellanox Connect 3 adapter.  

Machine Type = P8 
  
---Steps to Reproduce---
 in one machine run
mckey -m 224.0.0.10 -b 20.20.20.21

and other machine run 
mckey -m 224.0.0.10 -b 20.20.20.20 -s

then second machine will see this:
mckey -m 224.0.0.10 -b 20.20.20.20 -s
mckey: starting client
mckey: joining
mckey: joined dgid: ff0e::ffff:e000:a mlid 0x0 sl 0
initiating data transfers
data transfers complete
test complete
return status 0
 but the first machine will just hang waiting for packets:
mckey -m 224.0.0.10 -b 20.20.20.21
mckey: starting server
mckey: joining
mckey: joined dgid: ff0e::ffff:e000:a mlid 0x0 sl 0
receiving data transfers

There is an available patch: https://patchwork.kernel.org/patch/5507181/
to solve this issue.

** Affects: librdmacm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bugnameltc-121679 severity-medium targetmilestone-inin1504
-- 
RoCE mckey hangs in Ubuntu 15.04 (Mellanox)
https://bugs.launchpad.net/bugs/1422002
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