[openib-general] [PATCH for-2.6.18] IB/cma: option to limitMTU to 1K

[Sean Hefty]

Hal Rosenstock wrote:
> But it only needs the MTU on each local side (once for the REQ and on
> the remote side for the REP). It would mean that if the local side were
> capable of larger MTU and the remote side were Tavor, that the REQ would
> be REJ with MTU too large and need to be retried at a smaller MTU.

I agree with this approach.  The user should determine the proper MTU based on 
local information, and either set it to 1k if sending a REQ, or REJ the REQ if 
the MTU is too large.  I'm not sure that this policy should be in the CMA, 
versus the consumer, but I can go with the CMA.

I do think that the MTU could be negotiated down as part of the private data in 
the REP, but this would need to be done outside of the CMA.

- Sean