ACK/Cmnt: [PATCH 0/1][Mantic] Restore IB Peer Memory support for 6.5

[Stefan Bader]

On 26.02.24 21:06, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/2055082
> 
> This patch was dropped during 6.5 devel because it no longer applied,
> which regressed GPU Direct over Infiniband support for NVIDIA GPUs.
> 
> 6.5+ upstream does have an alternative interface based on dma-buf, but
> it only works for users with newer generations of GPUs, and only those
> running newer driver/CUDA stacks and the open GPU driver variant. We're
> working on a post to let users know what their options will be once
> we intentionally drop this support in 6.8. Carrying this patch in 6.5
> "one last time" will give those users some time to assess those options.
> 
> Note: this is the same patch we are carrying in the -nvidia optimized
> kernel tree.
> 
> Tested on a DGX A100 w/ nvidia_peermem from nvidia-dkms-535-server-open.
> 
> Jason Gunthorpe (1):
>    UBUNTU: SAUCE: RDMA/core: Introduce peer memory interface
> 
>   drivers/infiniband/core/Makefile      |   2 +-
>   drivers/infiniband/core/ib_peer_mem.h |  65 ++++
>   drivers/infiniband/core/peer_mem.c    | 526 ++++++++++++++++++++++++++
>   drivers/infiniband/core/umem.c        |  47 ++-
>   drivers/infiniband/hw/mlx5/cq.c       |  12 +-
>   drivers/infiniband/hw/mlx5/devx.c     |   3 +-
>   drivers/infiniband/hw/mlx5/doorbell.c |   5 +-
>   drivers/infiniband/hw/mlx5/mlx5_ib.h  |   2 +-
>   drivers/infiniband/hw/mlx5/mr.c       |  61 ++-
>   drivers/infiniband/hw/mlx5/qp.c       |  12 +-
>   drivers/infiniband/hw/mlx5/srq.c      |   2 +-
>   include/rdma/ib_umem.h                |  29 ++
>   include/rdma/peer_mem.h               | 176 +++++++++
>   13 files changed, 912 insertions(+), 30 deletions(-)
>   create mode 100644 drivers/infiniband/core/ib_peer_mem.h
>   create mode 100644 drivers/infiniband/core/peer_mem.c
>   create mode 100644 include/rdma/peer_mem.h
> 
Really really last? As that was said last time, too...

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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