Re: [PATCH for-next v3 0/7] RDMA/bnxt_re: Doorbell Drop Prevention

[Jason Gunthorpe <jgg@nvidia.com>]

On Tue, Jul 18, 2023 at 10:02:50PM -0700, Selvin Xavier wrote:
> The idea behind this series is to prevent Doorbell drops
> on some of the Broadcom adapters that require Doorbell
> moderation. This is achieved by pacing the doorbell writes
> into the hardware FIFO. The rate at which individual doorbells
> are written needs to be dynamically adjusted, because
> it depends on the ability of the hardware to drain the
> FIFO and on the number and behavior of individual
> doorbell writers. When congestion is detected by the user
> library, it notifies the driver and driver adjust the
> pacing parameters dynamically in a shared page, which will
> be used for pacing the Doorbells.
> 
> Currently this feature is targeted only for user applications.
> The corresponding user lib patch is in the pull request.
> https://github.com/linux-rdma/rdma-core/pull/1360
> 
> Thanks,
> Selvin Xavier
> 
> v2 -> v3:
>      Fix the build warning
>      Reported-by: kernel test robot <lkp@intel.com>
> 
> v1 -> v2:
>      Rebased the patches on top of the latest for-next branch
> 
> Chandramohan Akula (7):
>   bnxt_en: Update HW interface headers
>   bnxt_en: Share the bar0 address with the RoCE driver
>   RDMA/bnxt_re: Initialize Doorbell pacing feature
>   RDMA/bnxt_re: Enable pacing support for the user apps
>   RDMA/bnxt_re: Update alloc_page uapi for pacing
>   RDMA/bnxt_re: Implement doorbell pacing algorithm
>   RDMA/bnxt_re: Add a new uapi for driver notification

Applied to for-next, thanks

Jason