>I'm asking this from a device driver developer's perspective.  I'm not
>writing an application.  I'm trying to understand and define exactly
>what must be guaranteed by the device/driver up returning from
>post_recv().

At least from IB's view for post receive (from spec):

Control returns to the Consumer immediately after the WQEs have been submitted
to the Receive Queue or the SRQ and the HCA has been notified that one or more
WQEs are ready to process.

- Sean

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