[ofa-general] Re: [RFC][PATCH] last wqe event handler patch

[Roland Dreier]

 > So what you're saying is that the scenario Shirley described is not
 > possible...

Seems like it... so the "one at a time" draining bug fix is probably not
right.  The IB spec says:

If the HCA supports SRQ, for RC and UD service, the CI shall generate a
Last WQE Reached Affiliated Asynchronous Event on a QP that is in the
Error State and is associated with an SRQ when either:

    . a CQE is generated for the last WQE, or
    . the QP gets in the Error State and there are no more WQEs on the RQ.

It is slightly ambiguous what "generated" means for a CQE -- it is
conceivable that someone could interpret that to mean a CQE is "in
flight" but has not necessarily become visible.

Anyway I think we need to debug this further.

 - R.