From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Cc: Caleb Sander Mateos <csander@purestorage.com>,
Akilesh Kailash <akailash@google.com>,
bpf@vger.kernel.org, Xiao Ni <xni@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Ming Lei <ming.lei@redhat.com>
Subject: [PATCH v3 0/12] io_uring: add IORING_OP_BPF for extending io_uring
Date: Wed, 25 Mar 2026 00:37:21 +0800 [thread overview]
Message-ID: <20260324163753.1900977-1-ming.lei@redhat.com> (raw)
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
V3:
- add per-buffer iterator kfuncs for addressing Caleb's concern about
complicated kfunc interface, kernel mapped buffer produced by the
iterator can be read/written from bpf prog in zero copy style
- rename to bpf_ext
- change tests to copy between uring_buf and arena, which may match
with raid's use case
- misc cleanup
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 per-buffer iterator kfuncs
bpf: add bpf_uring_buf_dynptr to special_kfunc_list
selftests/io_uring: add io_uring_unregister_buffers()
selftests/io_uring: add BPF struct_ops and kfunc tests
selftests/io_uring: add buffer iterator selftest with BPF arena
include/linux/io_uring_types.h | 14 +-
include/uapi/linux/io_uring.h | 40 +
init/Kconfig | 7 +
io_uring/Makefile | 1 +
io_uring/bpf-ops.c | 7 +-
io_uring/bpf_ext.c | 755 ++++++++++++++++++
io_uring/bpf_ext.h | 71 ++
io_uring/io_uring.c | 9 +-
io_uring/io_uring.h | 6 +-
io_uring/opdef.c | 16 +
io_uring/rsrc.c | 46 +-
io_uring/rsrc.h | 68 +-
kernel/bpf/verifier.c | 12 +
tools/include/io_uring/mini_liburing.h | 10 +
tools/testing/selftests/Makefile | 3 +-
tools/testing/selftests/io_uring/.gitignore | 2 +
tools/testing/selftests/io_uring/Makefile | 173 ++++
.../selftests/io_uring/bpf_ext_basic.bpf.c | 94 +++
.../selftests/io_uring/bpf_ext_basic.c | 215 +++++
.../selftests/io_uring/bpf_ext_memcpy.bpf.c | 305 +++++++
.../selftests/io_uring/bpf_ext_memcpy.c | 517 ++++++++++++
.../io_uring/include/bpf_ext_memcpy_defs.h | 18 +
.../selftests/io_uring/include/iou_test.h | 98 +++
tools/testing/selftests/io_uring/runner.c | 206 +++++
24 files changed, 2646 insertions(+), 47 deletions(-)
create mode 100644 io_uring/bpf_ext.c
create mode 100644 io_uring/bpf_ext.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/bpf_ext_basic.bpf.c
create mode 100644 tools/testing/selftests/io_uring/bpf_ext_basic.c
create mode 100644 tools/testing/selftests/io_uring/bpf_ext_memcpy.bpf.c
create mode 100644 tools/testing/selftests/io_uring/bpf_ext_memcpy.c
create mode 100644 tools/testing/selftests/io_uring/include/bpf_ext_memcpy_defs.h
create mode 100644 tools/testing/selftests/io_uring/include/iou_test.h
create mode 100644 tools/testing/selftests/io_uring/runner.c
--
2.53.0
next reply other threads:[~2026-03-24 16:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 16:37 Ming Lei [this message]
2026-03-24 16:37 ` [PATCH V3 01/12] io_uring: make io_import_fixed() global Ming Lei
2026-03-24 16:37 ` [PATCH V3 02/12] io_uring: refactor io_prep_reg_iovec() for BPF kfunc use Ming Lei
2026-03-24 16:37 ` [PATCH V3 03/12] io_uring: refactor io_import_reg_vec() " Ming Lei
2026-03-24 16:37 ` [PATCH V3 04/12] io_uring: prepare for extending io_uring with bpf Ming Lei
2026-03-24 16:37 ` [PATCH V3 05/12] io_uring: bpf: extend io_uring with bpf struct_ops Ming Lei
2026-03-26 1:49 ` Jens Axboe
2026-03-26 2:09 ` Jens Axboe
2026-03-24 16:37 ` [PATCH V3 06/12] io_uring: bpf: implement struct_ops registration Ming Lei
2026-03-24 16:37 ` [PATCH V3 07/12] io_uring: bpf: add BPF buffer descriptor for IORING_OP_BPF Ming Lei
2026-03-24 16:37 ` [PATCH V3 08/12] io_uring: bpf: add per-buffer iterator kfuncs Ming Lei
2026-03-24 16:37 ` [PATCH V3 09/12] bpf: add bpf_uring_buf_dynptr to special_kfunc_list Ming Lei
2026-03-24 16:37 ` [PATCH V3 10/12] selftests/io_uring: add io_uring_unregister_buffers() Ming Lei
2026-03-24 16:37 ` [PATCH V3 11/12] selftests/io_uring: add BPF struct_ops and kfunc tests Ming Lei
2026-03-24 16:37 ` [PATCH V3 12/12] selftests/io_uring: add buffer iterator selftest with BPF arena Ming Lei
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