There is one case I still don't want to signal send completion, thats
the AEN request. It doesn't have a request structure, and preferred not
to check on it for every send completion, and its not racing anything
(mentioned this above).
I can change that though if there is a strong desire.
I don't really like having a special case just for this slow path
special case. So if we can avoid it without too much overhead let's
do it, otherwise we can keep it as-is.
Saving the state of the request completions adds complication in
general, and we don't even have a request for AENs so it would mean to
keep it under the queue, and we don't really race anything because we
don't have inline data there. So I think its simpler to keep it as is.
Sending a v3 that relaxes the req->lock to spin_lock_bh
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