> Calling ibv_create_qp() to create RC QP with max_send/recv_wr set to zero
> fails, however if only one of them is set to zero, its working fine.
Not too surprising.
> Also, if either of recv_cq or send_cq is NULL then the program crashes,
> where it seems the crash relates to these lines at ibv_cmd_create_qp()
>
> cmd->send_cq_handle = attr->send_cq->handle;
> cmd->recv_cq_handle = attr->recv_cq->handle;
Makes sense.
> So, are these limitations originating from the spec or from the
> implementation?
I'm not sure what the spec says about 0-sized QPs. However for the
create QP verb, the spec does say that the required inputs include:
The QP attributes that must be specified at QP create time are:
. The CQ to be associated with the Send Queue.
. The CQ to be associated with the Receive Queue.
and I'm not sure it's worth adding special cases to deal with null CQs
for QPs that don't have a send/receive queue. And I'm not sure how
much it's worth worrying about 0-sized QPs either.
- R.
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