Re: [PATCH v2 for-next 0/7] RDMA/hns: Add support for Dynamic Context Attachment

[liweihang <liweihang@huawei.com>]

On 2021/5/11 19:22, liweihang wrote:
> The HIP09 introduces the DCA(Dynamic Context Attachment) feature which
> supports many RC QPs to share the WQE buffer in a memory pool. If a QP
> enables DCA feature, the WQE's buffer will not be allocated when creating
> but when the users start to post WRs. This will reduce the memory
> consumption when there are too many QPs are inactive.
> 
> Changes since v1:
> * Modify return type of hns_roce_enable_dca() to void.
> * Link: https://patchwork.kernel.org/project/linux-rdma/cover/1620650889-61650-1-git-send-email-liweihang@huawei.com/
> 
> Two RFC versions of this series has been sent before, and it's associated
> with the userspace one "libhns: Add support for Dynamic Context
> Attachment".
> 
> Changes since RFC v2:
> * Just fix a typo in commit message of #6.
> * Link: https://patchwork.kernel.org/project/linux-rdma/cover/1611394994-50363-1-git-send-email-liweihang@huawei.com/
> 
> Changes since RFC v1:
> * Replace all GFP_ATOMIC with GFP_NOWAIT, because the former may use
>   emergency pool if no regular memory can be found.
> * Change size of cap_flags of alloc_ucontext_resp from 32 to 64 to avoid
>   a potential problem when pass it back to the userspace.
> * Move definition of HNS_ROCE_CAP_FLAG_DCA_MODE to hns-abi.h.
> * Rename free_mem_states() to free_dca_states() in #1.
> * Link: https://patchwork.kernel.org/project/linux-rdma/cover/1610706138-4219-1-git-send-email-liweihang@huawei.com/
> 
> Xi Wang (7):
>   RDMA/hns: Introduce DCA for RC QP
>   RDMA/hns: Add method for shrinking DCA memory pool
>   RDMA/hns: Configure DCA mode for the userspace QP
>   RDMA/hns: Add method for attaching WQE buffer
>   RDMA/hns: Setup the configuration of WQE addressing to QPC
>   RDMA/hns: Add method to detach WQE buffer
>   RDMA/hns: Add method to query WQE buffer's address
> 
>  drivers/infiniband/hw/hns/Makefile          |    2 +-
>  drivers/infiniband/hw/hns/hns_roce_dca.c    | 1262 +++++++++++++++++++++++++++
>  drivers/infiniband/hw/hns/hns_roce_dca.h    |   69 ++
>  drivers/infiniband/hw/hns/hns_roce_device.h |   33 +
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c  |  223 ++++-
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.h  |    3 +
>  drivers/infiniband/hw/hns/hns_roce_main.c   |   27 +-
>  drivers/infiniband/hw/hns/hns_roce_qp.c     |  105 ++-
>  include/uapi/rdma/hns-abi.h                 |   64 ++
>  9 files changed, 1746 insertions(+), 42 deletions(-)
>  create mode 100644 drivers/infiniband/hw/hns/hns_roce_dca.c
>  create mode 100644 drivers/infiniband/hw/hns/hns_roce_dca.h
> 

We have received new comments on v1, so please ignore this version.

Thanks
Weihang