Or wait for the send completion before completing the I/O?
In the normal case, that works.
If a POSIX signal occurs (^C, RPC timeout), the RPC exits immediately
and recovers all resources. The Send can still be running at that
point, and it can't be stopped (without transitioning the QP to
error state, I guess).
In that case we can't complete the I/O either (or move the
QP into error state), we need to defer/sleep on send completion.
The alternative is reference-counting the data structure that has
the ib_cqe and the SGE array. That adds one or more atomic_t
operations per I/O that I'd like to avoid.
Why atomics?
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