On 2021/2/6 2:03, Jason Gunthorpe wrote: > 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 > I sent the userspace part just now: https://patchwork.kernel.org/project/linux-rdma/cover/1612667574-56673-1-git-send-email-liweihang@xxxxxxxxxx/ Thanks Weihang
