cm_id, cq, mr, and pd resource tracking

This series enhances the iproute2 rdma tool to include dumping of connection manager id (cm_id), completion queue (cq), memory region (mr), and protection domain (pd) rdma resources. It is the user-space part of the kernel resource tracking series merged into rdma-next for 4.17 [1] and [2].

Changes since v3:
- replaced rdma_cma.h inclusion with UAPI rdma_user_cm.h
- display only device names instead of device/port for cq, mr, and pd since they are not associated with a specific port.

Changes since v2:
- pull in rdma-core:include/rdma/rdma_cma.h
- 80 column reformat
- add reviewed-by tags

Changes since v1/RFC:
- removed RFC tag
- initialize rd properly to avoid passing a garbage port number
- revert accidental change to qp_valid_filters
- removed cm_id dev/network/transport types
- cm_id ip addrs now passed up as __kernel_sockaddr_storage
- cm_id ip address ports printed as "address:port" strings
- only parse/display memory keys and iova if available
- filter on "users" for cqs and pds
- fixed memory leaks
- removed PD_FLAGS attribute
- filter on "mrlen" for mrs
- filter on "poll-ctx" for cqs
- don't require addrs or qp_type for parsing cm_ids
- only filter optional attrs if they are present
- remove PGSIZE MR attr to match kernel

[1] https://www.spinics.net/lists/linux-rdma/msg61720.html
[2] https://www.spinics.net/lists/linux-rdma/msg62979.html

    https://www.spinics.net/lists/linux-rdma/msg62980.html

---

Steve Wise (7):
rdma: update rdma_netlink.h
rdma: add UAPI rdma_user_cm.h
rdma: initialize the rd struct
rdma: Add CM_ID resource tracking information
rdma: Add CQ resource tracking information
rdma: Add MR resource tracking information
rdma: Add PD resource tracking information

 include/json_writer.h                 |   2 +
 lib/json_writer.c                     |  11 +
 rdma/include/uapi/rdma/rdma_netlink.h |  38 ++
 rdma/include/uapi/rdma/rdma_user_cm.h | 324 +++++++++++++++++
 rdma/rdma.c                           |   2 +-
 rdma/rdma.h                           |   2 +
 rdma/res.c                            | 633 +++++++++++++++++++++++++++++++++-
 rdma/utils.c                          |  16 +
 8 files changed, 1026 insertions(+), 2 deletions(-)
 create mode 100644 rdma/include/uapi/rdma/rdma_user_cm.h

1.8.3.1