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
