[PATCH v2 0/13] io_uring: add IORING_OP_BPF for extending io_uring

[Ming Lei <ming.lei@redhat.com>]

Hello,

Add IORING_OP_BPF for extending io_uring operations, follows typical cases:

- buffer registered zero copy [1]

Also there are some RAID like ublk servers which needs to generate data
parity in case of ublk zero copy

- extend io_uring operations from application

Easy to add one new syscall with IORING_OP_BPF

- extend 64 byte SQE

bpf map can store IO data conveniently

- communicate in IO chain

IORING_OP_BPF can be used for communicate among IOs seamlessly without requiring
extra syscall

- pretty handy to inject error for test purpose

Any comments & feedback are welcome!


[1] lpc2024: ublk based zero copy I/O - use case in Android

https://lpc.events/event/18/contributions/1710/attachments/1440/3070/LPC2024_ublk_zero_copy.pdf


V2:
	- per-ring struct ops (Stefan Metzmacher, Caleb Sander Mateos)
	- refactor io_import_fixed()/io_prep_reg_iovec()/io_import_reg_vec()
	  for allowing to handle multiple buffers for single request
	- kernel selftests
	- all kinds of comments from Caleb Sander Mateos
	- support vectored and registered vector buffer


Ming Lei (12):
  io_uring: make io_import_fixed() global
  io_uring: refactor io_prep_reg_iovec() for BPF kfunc use
  io_uring: refactor io_import_reg_vec() for BPF kfunc use
  io_uring: prepare for extending io_uring with bpf
  io_uring: bpf: extend io_uring with bpf struct_ops
  io_uring: bpf: implement struct_ops registration
  io_uring: bpf: add BPF buffer descriptor for IORING_OP_BPF
  io_uring: bpf: add uring_bpf_memcpy() kfunc
  selftests/io_uring: add BPF struct_ops and kfunc tests
  selftests/io_uring: add bpf_memcpy selftest for uring_bpf_memcpy()
    kfunc
  selftests/io_uring: add copy_user_to_fixed() and copy_fixed_to_user()
    bpf_memcpy tests
  selftests/io_uring: add copy_user_to_reg_vec() and
    copy_reg_vec_to_user() bpf_memcpy tests

Pavel Begunkov (1):
  selftests/io_uring: update mini liburing

 include/linux/io_uring_types.h                |   5 +
 include/uapi/linux/io_uring.h                 |  40 ++
 init/Kconfig                                  |   7 +
 io_uring/Makefile                             |   1 +
 io_uring/bpf_op.c                             | 669 ++++++++++++++++++
 io_uring/bpf_op.h                             |  61 ++
 io_uring/io_uring.c                           |   5 +
 io_uring/io_uring.h                           |   6 +-
 io_uring/opdef.c                              |  16 +
 io_uring/rsrc.c                               |  46 +-
 io_uring/rsrc.h                               |  68 +-
 tools/include/io_uring/mini_liburing.h        |  67 +-
 tools/testing/selftests/Makefile              |   3 +-
 tools/testing/selftests/io_uring/.gitignore   |   2 +
 tools/testing/selftests/io_uring/Makefile     | 173 +++++
 .../selftests/io_uring/basic_bpf_ops.bpf.c    |  94 +++
 .../selftests/io_uring/basic_bpf_ops.c        | 215 ++++++
 .../selftests/io_uring/bpf_memcpy.bpf.c       |  98 +++
 tools/testing/selftests/io_uring/bpf_memcpy.c | 517 ++++++++++++++
 .../selftests/io_uring/include/iou_test.h     |  98 +++
 tools/testing/selftests/io_uring/runner.c     | 206 ++++++
 21 files changed, 2339 insertions(+), 58 deletions(-)
 create mode 100644 io_uring/bpf_op.c
 create mode 100644 io_uring/bpf_op.h
 create mode 100644 tools/testing/selftests/io_uring/.gitignore
 create mode 100644 tools/testing/selftests/io_uring/Makefile
 create mode 100644 tools/testing/selftests/io_uring/basic_bpf_ops.bpf.c
 create mode 100644 tools/testing/selftests/io_uring/basic_bpf_ops.c
 create mode 100644 tools/testing/selftests/io_uring/bpf_memcpy.bpf.c
 create mode 100644 tools/testing/selftests/io_uring/bpf_memcpy.c
 create mode 100644 tools/testing/selftests/io_uring/include/iou_test.h
 create mode 100644 tools/testing/selftests/io_uring/runner.c

-- 
2.47.0