Re: [PATCH v3 for-next] RDMA/hns: Support owner mode doorbell

[Jason Gunthorpe <jgg@nvidia.com>]

On Tue, Oct 20, 2020 at 08:04:53PM +0800, Weihang Li wrote:
> From: Lang Cheng <chenglang@huawei.com>
> 
> The doorbell needs to store PI information into QPC, so the RoCEE should
> wait for the results of storing, that is, it needs two bus operations to
> complete a doorbell. When ROCEE is in SDI mode, multiple doorbells may be
> interlocked because the RoCEE can only handle bus operations serially. So a
> flag to mark if HIP09 is working in SDI mode is added. When the SDI flag is
> set, the ROCEE will ignore the PI information of the doorbell, continue to
> fetch wqe and verify its validity by it's owner_bit.
> 
> Signed-off-by: Lang Cheng <chenglang@huawei.com>
> Signed-off-by: Weihang Li <liweihang@huawei.com>
> ---
> Changes since v2:
> - Replace wmb() with dma_wmb().
> link: https://patchwork.kernel.org/project/linux-rdma/patch/1601199901-41677-1-git-send-email-liweihang@huawei.com/
> 
> Changes since v1:
> - Fix comments from Leon about the unused enum.
> link: https://patchwork.kernel.org/patch/11799327/
> 
>  drivers/infiniband/hw/hns/hns_roce_device.h |  4 +++-
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c  | 28 ++++++++++++++++++++++------
>  drivers/infiniband/hw/hns/hns_roce_qp.c     |  3 +++
>  3 files changed, 28 insertions(+), 7 deletions(-)

Applied to for-next, thanks

Jason