[PATCH v2 1/3] nvme-rdma: don't suppress send completions

[Sagi Grimberg]

>> 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