Re: [PATCH bpf-next v7 00/24] Introduce eBPF support for HID devices

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Hello,

Tried this out with my USI support eBPF code, and it works fine with the single patch I had to apply on top of i2c-hid (not related to the hid-bpf support itself.)

For the whole series:

Tested-by: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>

-Tero

On 21/07/2022 18:36, Benjamin Tissoires wrote:
Hi,

here comes the v7 of the HID-BPF series.

Again, for a full explanation of HID-BPF, please refer to the last patch
in this series (24/24).

This version sees some minor improvements compared to v6, only
focusing on the reviews I got.

I also wanted to mention that I have started working on the userspace
side to "see" how the BPF programs would look when automatically loaded.
See the udev-hid-bpf project[0] for the code.

The idea is to define the HID-BPF userspace programs so we can reuse
the same semantic in the kernel.
I am quite happy with the results: this looks pretty similar to a kernel
module in term of design. The .bpf.c file is a standalone compilation
unit, and instead of having a table of ids, the filename is used (based
on the modalias). This allows to have a "probe" like function that we
can run to decide if the program needs to be attached or not.

All in all, the end result is that we can write the bpf program, compile
it locally, and send the result to the user. The user needs to drop the
.bpf.o in a local folder, and udev-hid-bpf will pick it up the next time
the device is plugged in. No other operations is required.

Next step will be to drop the same source file in the kernel source
tree, and have some magic to automatically load the compiled program
when the device is loaded.

Cheers,
Benjamin

[0] https://gitlab.freedesktop.org/bentiss/udev-hid-bpf (warning: probably
not the best rust code ever)

Benjamin Tissoires (24):
   selftests/bpf: fix config for CLS_BPF
   bpf/verifier: allow kfunc to read user provided context
   bpf/verifier: do not clear meta in check_mem_size
   selftests/bpf: add test for accessing ctx from syscall program type
   bpf/verifier: allow kfunc to return an allocated mem
   selftests/bpf: Add tests for kfunc returning a memory pointer
   bpf: prepare for more bpf syscall to be used from kernel and user
     space.
   libbpf: add map_get_fd_by_id and map_delete_elem in light skeleton
   HID: core: store the unique system identifier in hid_device
   HID: export hid_report_type to uapi
   HID: convert defines of HID class requests into a proper enum
   HID: Kconfig: split HID support and hid-core compilation
   HID: initial BPF implementation
   selftests/bpf: add tests for the HID-bpf initial implementation
   HID: bpf: allocate data memory for device_event BPF programs
   selftests/bpf/hid: add test to change the report size
   HID: bpf: introduce hid_hw_request()
   selftests/bpf: add tests for bpf_hid_hw_request
   HID: bpf: allow to change the report descriptor
   selftests/bpf: add report descriptor fixup tests
   selftests/bpf: Add a test for BPF_F_INSERT_HEAD
   samples/bpf: add new hid_mouse example
   HID: bpf: add Surface Dial example
   Documentation: add HID-BPF docs

  Documentation/hid/hid-bpf.rst                 | 512 +++++++++
  Documentation/hid/index.rst                   |   1 +
  drivers/Makefile                              |   2 +-
  drivers/hid/Kconfig                           |  20 +-
  drivers/hid/Makefile                          |   2 +
  drivers/hid/bpf/Kconfig                       |  18 +
  drivers/hid/bpf/Makefile                      |  11 +
  drivers/hid/bpf/entrypoints/Makefile          |  93 ++
  drivers/hid/bpf/entrypoints/README            |   4 +
  drivers/hid/bpf/entrypoints/entrypoints.bpf.c |  66 ++
  .../hid/bpf/entrypoints/entrypoints.lskel.h   | 682 ++++++++++++
  drivers/hid/bpf/hid_bpf_dispatch.c            | 553 ++++++++++
  drivers/hid/bpf/hid_bpf_dispatch.h            |  28 +
  drivers/hid/bpf/hid_bpf_jmp_table.c           | 577 ++++++++++
  drivers/hid/hid-core.c                        |  49 +-
  include/linux/bpf.h                           |   9 +-
  include/linux/btf.h                           |  10 +
  include/linux/hid.h                           |  38 +-
  include/linux/hid_bpf.h                       | 148 +++
  include/uapi/linux/hid.h                      |  26 +-
  include/uapi/linux/hid_bpf.h                  |  25 +
  kernel/bpf/btf.c                              |  91 +-
  kernel/bpf/syscall.c                          |  10 +-
  kernel/bpf/verifier.c                         |  65 +-
  net/bpf/test_run.c                            |  23 +
  samples/bpf/.gitignore                        |   2 +
  samples/bpf/Makefile                          |  27 +
  samples/bpf/hid_mouse.bpf.c                   | 134 +++
  samples/bpf/hid_mouse.c                       | 147 +++
  samples/bpf/hid_surface_dial.bpf.c            | 161 +++
  samples/bpf/hid_surface_dial.c                | 212 ++++
  tools/include/uapi/linux/hid.h                |  62 ++
  tools/include/uapi/linux/hid_bpf.h            |  25 +
  tools/lib/bpf/skel_internal.h                 |  23 +
  tools/testing/selftests/bpf/Makefile          |   5 +-
  tools/testing/selftests/bpf/config            |   5 +-
  tools/testing/selftests/bpf/prog_tests/hid.c  | 990 ++++++++++++++++++
  .../selftests/bpf/prog_tests/kfunc_call.c     |  76 ++
  tools/testing/selftests/bpf/progs/hid.c       | 206 ++++
  .../selftests/bpf/progs/kfunc_call_test.c     | 125 +++
  40 files changed, 5184 insertions(+), 79 deletions(-)
  create mode 100644 Documentation/hid/hid-bpf.rst
  create mode 100644 drivers/hid/bpf/Kconfig
  create mode 100644 drivers/hid/bpf/Makefile
  create mode 100644 drivers/hid/bpf/entrypoints/Makefile
  create mode 100644 drivers/hid/bpf/entrypoints/README
  create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.bpf.c
  create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.lskel.h
  create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.c
  create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.h
  create mode 100644 drivers/hid/bpf/hid_bpf_jmp_table.c
  create mode 100644 include/linux/hid_bpf.h
  create mode 100644 include/uapi/linux/hid_bpf.h
  create mode 100644 samples/bpf/hid_mouse.bpf.c
  create mode 100644 samples/bpf/hid_mouse.c
  create mode 100644 samples/bpf/hid_surface_dial.bpf.c
  create mode 100644 samples/bpf/hid_surface_dial.c
  create mode 100644 tools/include/uapi/linux/hid.h
  create mode 100644 tools/include/uapi/linux/hid_bpf.h
  create mode 100644 tools/testing/selftests/bpf/prog_tests/hid.c
  create mode 100644 tools/testing/selftests/bpf/progs/hid.c




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