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

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On Sat, Jan 23, 2021 at 05:43:07PM +0800, Weihang Li 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:
> * 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@xxxxxxxxxx/
> 
> 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    | 1264 +++++++++++++++++++++++++++
>  drivers/infiniband/hw/hns/hns_roce_dca.h    |   68 ++
>  drivers/infiniband/hw/hns/hns_roce_device.h |   31 +
>  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     |  119 ++-
>  include/uapi/rdma/hns-abi.h                 |   64 ++

Where are the rdma-core changes to go with this?

Jason



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