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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 2040526
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
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the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Jammy)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2040526
Title:
Backport RDMA DMABUF
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Jammy:
Incomplete
Bug description:
SRU Justification:
[Impact]
* From Nvidia:
"We are working on a high performance networking solution with real
customers. That solution is being developed using the Ubuntu 22.04 LTS
distro release and the distro kernel (lowlatency flavour). This
“dma_buf” patchset consists of upstreamed patches that allow buffers
to be shared between drivers thus enhancing performance while reducing
copying of data.
Our team is currently engaged in the development of a high-performance
networking solution tailored to meet the demands of real-world
customers. This cutting-edge solution is being crafted on the
foundation of Ubuntu 22.04 LTS, utilizing the distribution's kernel,
specifically the lowlatency flavor.
At the heart of our innovation lies the transformative "dma_buf"
patchset, comprising a series of patches that have been integrated
into the upstream kernel in 5.16 and 5.17. These patches introduce a
groundbreaking capability: enabling the seamless sharing of buffers
among various drivers. This not only bolsters the solution's
performance but also minimizes the need for data copying, effectively
enhancing efficiency across the board.
The new functionality is isolated such that existing user will not
execute these new code paths."
Upstream Reference
https://lore.kernel.org/all/20211012120903.96933-1-galpr...@amazon.com/
https://lore.kernel.org/all/0-v1-bd147097458e+ede-umem_dmabuf_...@nvidia.com/
The patch "[PATCH 1/4] net/mlx5: Add IFC bits for mkey ATS" is already in
Jammy and was included in:
"2a1e6097e9b9 UBUNTU: SAUCE: RDMA/core: Updated ib_peer_memory"
[Test Plan]
* Testing instructions are outlined in the SF case and has been tested
on in house hardware and externally by Nvidia.
[Where problems could occur?]
* This introduces new code paths so regression potential should be
low.
[Other Info]
* SF#00370664
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