[openib-general] RFC: detecting duplicate MAD requests

[Sean Hefty]

Michael S. Tsirkin wrote:
> Is that per-agent, or global? If per-agent, can this hurt user that writes
> scripts using management utilities? These will typically send or receive
> something and exit. No?

This is per agent.  The proposal would only affect applications that generate 
the responses.  (Think of it as enforcing that all response MADs match with a 
received request, so a user can't generate a response for a request that they 
never received.)  An agent that sends a request, and receives the response is 
unaffected.

> Is the table of methods maintained per agent then?

That would be my plan; although, we could probably make it global.

>>The other problem is that DS RMPP requires maintaining state between receiving
>>a request and the generation of a response.
> 
> It does? Why does it?

It needs to track receiving an ACK of the final ACK to the request, which 
carries the initial window size for the response.  Conceptually, what happens is:

-- request -->
  <-- ACK request --
-- ACK (response window) -->
<-- response --
-- ACK response ->

- Sean