[openib-general] [PATCH] IB/cma: add rdma_establish

[Sean Hefty]

Michael S. Tsirkin wrote:
>>>As a side note, reasons for frequent loss of RTU must be investigated.
>>
>>A lost RTU shouldn't be any more likely than a lost REQ or REP.  Is the RTU 
>>never showing up?
> 
> 
> Seems like that. I know fir sure I do accept after REP but remote side never
> gets ESTABLISHED.

I looked at the code, then ran some tests.  The REP is retried until an RTU is 
received, or its number of retries is exhausted.  By modifying the IB CM, I was 
able to force RTU drops.  Using madeye, I could see that the REP would be 
retried, resulting in the RTU being resent.  After 4 drops, I had the code 
receive the RTU, which allowed the test to proceed.

A couple things to look at in OFED would be the setting of max cm retries and 
the cm timeout.

- Sean