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[v4,for-next,0/1] RDMA/hns: Support direct WQE of userspace

Message ID 20211122033801.30807-1-liangwenpeng@huawei.com (mailing list archive)
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Series RDMA/hns: Support direct WQE of userspace | expand

Message

Wenpeng Liang Nov. 22, 2021, 3:38 a.m. UTC 
Direct wqe is a mechanism to fill wqe directly into the hardware. In the
case of light load, the wqe will be filled into pcie bar space of the
hardware, this will reduce one memory access operation and therefore reduce
the latency.

The user space parts is named "libhns: Add support for direct wqe".

Changes since v3:
* Commit based on the latest code.
* Remove unused variable "ibdev" from alloc_qp_db.
* https://patchwork.kernel.org/project/linux-rdma/cover/20211116150400.23459-1-liangwenpeng@huawei.com/

Changes since v2:
* Direct wqe uses the new mmap scheme (https://patchwork.kernel.org/project/linux-rdma/patch/20211028105640.1056-1-liangwenpeng@huawei.com/).
* https://patchwork.kernel.org/project/linux-rdma/cover/1622705834-19353-1-git-send-email-liweihang@huawei.com/

Changes since v1:
* Remove 'inline' of two functions in #1.
* Enable direct wqe by default in #2.
* https://patchwork.kernel.org/project/linux-rdma/cover/1622193545-3281-1-git-send-email-liweihang@huawei.com/

Yixing Liu (1):
  RDMA/hns: Support direct wqe of userspace

 drivers/infiniband/hw/hns/hns_roce_device.h |  8 +--
 drivers/infiniband/hw/hns/hns_roce_main.c   | 38 ++++++++++++---
 drivers/infiniband/hw/hns/hns_roce_pd.c     |  3 ++
 drivers/infiniband/hw/hns/hns_roce_qp.c     | 54 ++++++++++++++++++++-
 include/uapi/rdma/hns-abi.h                 |  2 +
 5 files changed, 94 insertions(+), 11 deletions(-)

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