1)
> rdma_post_atomic_writev(struct rdma_cm_id *id, void *context, struct ibv_sge *sgl,
> int nsge, int flags, uint64_t remote_addr, uint32_t rkey)
Do we need this API at all?
Other atomic operations (compare_swap/add) do not use struct ibv_sge at all but have a dedicated place in
struct ib_send_wr {
...
struct {
uint64_t remote_addr;
uint64_t compare_add;
uint64_t swap;
uint32_t rkey;
} atomic;
...
}
Would it be better to reuse (extend) any existing field?
i.e.
struct {
uint64_t remote_addr;
uint64_t compare_add;
uint64_t swap_write;
uint32_t rkey;
} atomic;
Thanks
Tomasz
> -----Original Message-----
> From: Xiao Yang <yangx.jy@xxxxxxxxxxx>
> Sent: Thursday, December 30, 2021 1:14 PM
> To: linux-rdma@xxxxxxxxxxxxxxx
> Cc: yanjun.zhu@xxxxxxxxx; rpearsonhpe@xxxxxxxxx; jgg@xxxxxxxxxx; y-
> goto@xxxxxxxxxxx; lizhijian@xxxxxxxxxxx; Gromadzki, Tomasz
> <tomasz.gromadzki@xxxxxxxxx>; Xiao Yang <yangx.jy@xxxxxxxxxxx>
> Subject: [RFC PATCH 0/2] RDMA/rxe: Add RDMA Atomic Write operation
>
> The IB SPEC v1.5[1][2] added new RDMA operations (Atomic Write and
> Flush).
> This patchset makes SoftRoCE support new RDMA Atomic Write on RC
> service.
>
> I added RDMA Atomic Write API and a rdma_atomic_write example on my
> rdma-core repository[3]. 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/ibta-specification/ # login required
> [2]: 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
> [3]: https://github.com/yangx-jy/rdma-core
>
> BTW: This patchset also needs the following fix.
> https://www.spinics.net/lists/linux-rdma/msg107838.html
>
> Xiao Yang (2):
> RDMA/rxe: Rename send_atomic_ack() and atomic member of struct
> resp_res
> RDMA/rxe: Add RDMA Atomic Write operation
>
> drivers/infiniband/sw/rxe/rxe_comp.c | 4 ++
> drivers/infiniband/sw/rxe/rxe_opcode.c | 18 ++++++++
> drivers/infiniband/sw/rxe/rxe_opcode.h | 3 ++
> drivers/infiniband/sw/rxe/rxe_qp.c | 5 ++-
> drivers/infiniband/sw/rxe/rxe_req.c | 10 +++--
> drivers/infiniband/sw/rxe/rxe_resp.c | 59 ++++++++++++++++++++------
> drivers/infiniband/sw/rxe/rxe_verbs.h | 2 +-
> include/rdma/ib_pack.h | 2 +
> include/rdma/ib_verbs.h | 2 +
> include/uapi/rdma/ib_user_verbs.h | 2 +
> 10 files changed, 88 insertions(+), 19 deletions(-)
>
> --
> 2.23.0
>
>
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