ACK/Cmnt: [PATCH 0/1][Mantic] Restore IB Peer Memory support for 6.5
Stefan Bader
stefan.bader at canonical.com
Fri Mar 1 08:35:33 UTC 2024
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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