Merge branch 'opfn' into hfi1-tid

This series adds the OPFN feature, which is used as the negotiation
protocol by TID RDMA. This adds a totally hidden, in-band negotiation
transfer that happens on the consumer's queue pair but without the
consumer's knowledge.  For that reason, things like completions for OPFN
transfers must be filtered out of the completion queue and not sent to
the consumer.  This feature does not impact any consumer APIs, but does
impact the driver/driver wire API.

At a high level OPFN enables exchanging parameters between two hosts
using IB compare and swap requests to a special virtual address. The
request uses a reserved IB work request opcode (see patch 3).

* opfn:
  IB/hfi1: Add static trace for OPFN
  IB/hfi1: Integrate OPFN into RC transactions
  IB/hfi1, IB/rdmavt: Allow for extending of QP's s_ack_queue
  IB/hfi1: OPFN interface
  IB/hfi1: Add OPFN helper functions for TID RDMA feature
  IB/hfi1: OPFN support discovery

Signed-off-by: Doug Ledford <dledford@redhat.com>