[PATCH v4 0/3] RDMA/rxe: Add RDMA Atomic Write operation

[Xiao Yang <yangx.jy@fujitsu.com>]

The IB SPEC v1.5[1] defined new RDMA Atomic Write operation. This
patchset makes SoftRoCE support new RDMA Atomic Write on RC service.

I add ibv_wr_rdma_atomic_write() and a rdma_atomic_write example on my
rdma-core repository[2].  You can verify the patchset by building and
running the rdma_atomic_write example.
server:
$ ./rdma_atomic_write_server -s [server_address] -p [port_number]
client:
$ ./rdma_atomic_write_client -s [server_address] -p [port_number]

[1]: https://www.infinibandta.org/wp-content/uploads/2021/08/IBTA-Overview-of-IBTA-Volume-1-Release-1.5-and-MPE-2021-08-17-Secure.pptx
[2]: https://github.com/yangx-jy/rdma-core/tree/new_api_with_point

v3->v4:
1) Rebase on current wip/jgg-for-next
2) Fix a compiler error on 32-bit arch (e.g. parisc) by disabling RDMA Atomic Write
3) Replace 64-bit value with 8-byte array for RDMA Atomic Write

V2->V3:
1) Rebase
2) Add RDMA Atomic Write attribute for rxe device

V1->V2:
1) Set IB_OPCODE_RDMA_ATOMIC_WRITE to 0x1D
2) Add rdma.atomic_wr in struct rxe_send_wr and use it to pass the atomic write value
3) Use smp_store_release() to ensure that all prior operations have completed

Xiao Yang (3):
  RDMA/rxe: Rename send_atomic_ack() and atomic member of struct
    resp_res
  RDMA/rxe: Support RDMA Atomic Write operation
  RDMA/rxe: Add RDMA Atomic Write attribute for rxe device

 drivers/infiniband/sw/rxe/rxe_comp.c   |  4 ++
 drivers/infiniband/sw/rxe/rxe_opcode.c | 19 ++++++++
 drivers/infiniband/sw/rxe/rxe_opcode.h |  3 ++
 drivers/infiniband/sw/rxe/rxe_param.h  |  5 +++
 drivers/infiniband/sw/rxe/rxe_qp.c     |  4 +-
 drivers/infiniband/sw/rxe/rxe_req.c    | 13 +++++-
 drivers/infiniband/sw/rxe/rxe_resp.c   | 61 ++++++++++++++++++++------
 drivers/infiniband/sw/rxe/rxe_verbs.h  |  2 +-
 include/rdma/ib_pack.h                 |  2 +
 include/rdma/ib_verbs.h                |  3 ++
 include/uapi/rdma/ib_user_verbs.h      |  4 ++
 include/uapi/rdma/rdma_user_rxe.h      |  1 +
 12 files changed, 103 insertions(+), 18 deletions(-)

-- 
2.34.1