[rdma-core,v5,0/6] Add user space dma-buf support

Message

Xiong, Jianxin Jan. 14, 2021, 9:35 p.m. UTC

This is the fifth version of the patch series. Change log:

v5:
* Use a different mr_type for dmabuf so that ibv_dofork_range() is not
  called inside ibv_dereg_mr() for dmabuf based mr

v4: https://www.spinics.net/lists/linux-rdma/msg98135.html
* Rework the cmake funciton rdma_cython_module to support both single
  source (.pyx) and multiple source (.pyx + [.c]*) scenarios instead
  of using two separate functions
* Rename 'dri_*' to 'drm_*' for the dmabuf allocation interface
* Add option to dmabuf allocation routine to allow allocation from GTT
  instead of VRAM
* Add proper CPU access flags when allocating dmabufs
* Remove 'radeon' driver support from the dmabuf allocation routines
* Add comand line arguments to the tests for selecting GPU unit and
  setting the option for allocating from GTT

v3: https://www.spinics.net/lists/linux-rdma/msg98059.html
* Add parameter 'iova' to the new ibv_reg_dmabuf_mr() API
* Change the way of allocating dma-buf object - use /dev/dri/renderD*
  instead of /dev/dri/card* and use GEM object instead of dumb buffer
* Add cmake function to allow building modules with mixed cython and C
  source files
* Add new tests that use dma-buf MRs for send/recv and rdma traffic
* Skip dma-buf tests on unsupported systems
* Remove some use of random values in the new tests
* Add dealloc() and close() methods to the new classes
* Replace string.format with f-string in python code
* Fix some coding style issues: spacing, indentation, typo, comments

v2: https://www.spinics.net/lists/linux-rdma/msg97936.html
* Put the kernel header updates into a separate commit
* Add comments for the data structure used in python ioctl calls
* Fix issues related to symbol versioning
* Fix styling issues: extra spaces, unncecessary variable, typo
* Fix an inproper error code usage
* Put the new op into ibv_context_ops instead if verbs_context

v1: https://www.spinics.net/lists/linux-rdma/msg97865.html
* Add user space API for registering dma-buf based memory regions
* Update pyverbs with the new API
* Add new tests

This is the user space counter-part of the kernel patch set to add
dma-buf support to the RDMA subsystem.

This series consists of six patches. The first patch updates the
kernel headers for dma-buf support. Patch 2 adds the new API function
and updates the man pages. Patch 3 implements the new API in the mlx5
provider. Patch 4 adds new class definitions to pyverbs for the new API.
Patch 5 adds a set of new tests for the new API. Patch 6 fixes bug in
the utility code of the tests.

Pull request at github: https://github.com/linux-rdma/rdma-core/pull/895

Jianxin Xiong (6):
  Update kernel headers
  verbs: Support dma-buf based memory region
  mlx5: Support dma-buf based memory region
  pyverbs: Add dma-buf based MR support
  tests: Add tests for dma-buf based memory regions
  tests: Bug fix for get_access_flags()

 buildlib/pyverbs_functions.cmake         |  78 ++++++---
 debian/libibverbs1.symbols               |   2 +
 kernel-headers/rdma/ib_user_ioctl_cmds.h |  14 ++
 libibverbs/CMakeLists.txt                |   2 +-
 libibverbs/cmd_mr.c                      |  38 +++++
 libibverbs/driver.h                      |   8 +
 libibverbs/dummy_ops.c                   |  11 ++
 libibverbs/libibverbs.map.in             |   6 +
 libibverbs/man/ibv_reg_mr.3              |  27 ++-
 libibverbs/verbs.c                       |  18 ++
 libibverbs/verbs.h                       |  11 ++
 providers/mlx5/mlx5.c                    |   2 +
 providers/mlx5/mlx5.h                    |   3 +
 providers/mlx5/verbs.c                   |  22 +++
 pyverbs/CMakeLists.txt                   |  11 +-
 pyverbs/dmabuf.pxd                       |  15 ++
 pyverbs/dmabuf.pyx                       |  73 ++++++++
 pyverbs/dmabuf_alloc.c                   | 278 +++++++++++++++++++++++++++++++
 pyverbs/dmabuf_alloc.h                   |  19 +++
 pyverbs/libibverbs.pxd                   |   2 +
 pyverbs/mr.pxd                           |   6 +
 pyverbs/mr.pyx                           | 105 +++++++++++-
 tests/args_parser.py                     |   4 +
 tests/test_mr.py                         | 264 ++++++++++++++++++++++++++++-
 tests/utils.py                           |  30 +++-
 25 files changed, 1013 insertions(+), 36 deletions(-)
 create mode 100644 pyverbs/dmabuf.pxd
 create mode 100644 pyverbs/dmabuf.pyx
 create mode 100644 pyverbs/dmabuf_alloc.c
 create mode 100644 pyverbs/dmabuf_alloc.h