Eric Barton wrote:
I'm using the rdam_cm API. I've seen it call my CM callback with
RDMA_CM_EVENT_DISCONNECTED twice. Is this a bug?
I would consider this a bug.
The problem is that the underlying IB CM is reporting two events: DREQ_RECEIVED,
followed by DREP_RECEIVED. The RDMA CM reports both of these as DISCONNECTED
events. It makes more sense to me if the RDMA CM only reported the first event,
and discarded the second.
I've implemented connection teardown procedure that checks whether this is the
first time it has been called on a given connection. If not, it's a NOOP.
Otherwise it schedules the connection for teardown by a thread. This thread
calls rdma_disconnect() and then explicitly moves the QP state to error (but
maybe that's redundant?).
rdma_disconnect will transition the QP into the error state. I recently updated
the documentation to clarify this.
Thanks for the report.
- Sean
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