[ofa-general] SDP and iWARP

[Steve Wise]

Perhaps we can eventually make the ofed sdp module support both 
protocols based on the device transport type...


Michael Krause wrote:
> 
> The IETF defines SDP over iWARP.  To a very large extent, the main data 
> path operations are the same.  There are differences in the port mapper 
> and hello exchanges.   For the most part, the IETF specification learned 
> from the problems implementing SDP / IB as well as dealt with the 
> constraints imposed by the IETF MPA specification.    Done right, the 
> differences should be transparent to applications with only minor 
> changes required within the underlying library / infrastructure.
> 
> Mike
> 
> At 09:54 AM 1/24/2008, Steve Wise wrote:
>> Roland Dreier wrote:
>>> Sorry to come into this thread so late, but does it make sense to try
>>> the current SDP code over iWARP?  As I understand things, the RDMA
>>> consortium has its own spec for SDP on iWARP, which may not precisely
>>> correspond to the IBA SDP annex.  So probably the SDP code would need
>>> updating to work over iWARP.
>>
>> I didn't think they were that different, but I don't know for sure. 
>> However, unless the IB-SDP uses atomics or some other IB-specific work 
>> request, it just might work.
>>
>>> (And don't all the iWARP vendors have TCP offload socket stuff for
>>> their adapters anyway, which is a simpler solution to the same problem
>>> that SDP solves?)
>>
>> Dunno about other vendors, but Chelsio's TOE code is available on 
>> their web site (service.chelsio.com).  It will be more efficient than 
>> SDP over iWARP (no SDP/iWARP headers needed).
>>
>> I assume Craig is doing some research to perhaps determine exactly how 
>> SDP performs over iwarp vs TOE or standard TCP.
>>
>>
>> Steve.
>>
>>
>>
>>
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