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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49807b21e66sm204413825e9.0.2026.08.03.05.51.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 05:51:15 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Emil Tsalapatis , Tejun Heo , kkd@meta.com, kernel-team@meta.com Subject: [PATCH bpf-next v3 0/9] Add arena argument support to kfuncs and struct_ops Date: Mon, 3 Aug 2026 14:51:01 +0200 Message-ID: <20260803125115.2264733-1-memxor@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3173; i=memxor@gmail.com; h=from:subject; bh=VoXeMu5vERJEUjNyjuAO0hxbL4rdbkY2AFltVsbJEYA=; b=owGbwMvMwCXmrmtenRyi38x4Wi2JIaugb+MdTe76ojVroxj7M9J2zprVesPTrk7Te8ac20p3t zLe+/aio5SFQYyLQVZMkaXk/z4m4xOVvwNtl3HDzGFlAhnCwMUpABNRd2NkuO+xiL+yOyP394a1 Z7miDfasnrm7f073/SaZhYYqFpevGzAyzO8+s3BXZjJfdtrrmlsGCwNf28Q3KZzglLLI3bVRfB4 DAwA= X-Developer-Key: i=memxor@gmail.com; a=openpgp; fpr=B34BD741DE8494B76E2F717880EF20021D46C59B Content-Transfer-Encoding: 8bit This is a continuation of patches in [0], with mostly minor changes and reordering. The motivation is covered in that link. A major change is moving to two tags (__arena and __arena_nullable) and moving the changes to JIT to emit more optimized sequences. Please see commit logs for details. [0]: https://lore.kernel.org/bpf/20260713024414.3759854-1-tj@kernel.org Changelog: ---------- v2 -> v3 v2: https://lore.kernel.org/bpf/20260726013105.3689867-1-memxor@gmail.com * Rebase onto current bpf-next to resolve conflicts. v1 -> v2 v1: https://lore.kernel.org/bpf/20260715220052.1590783-1-memxor@gmail.com * Fix documentation to only mention x86 for now. (Sashiko) * Move arg bitmap from insn_aux_data to kfunc descriptor. (Eduard) Tejun Heo (9): bpf: Support __arena and __arena_nullable kfunc argument suffixes bpf: Support __arena and __arena_nullable on struct_ops arguments bpf, x86: JIT __arena kfunc argument rebasing bpf, x86: Convert struct_ops arena arguments in the trampoline selftests/bpf: Add kfunc __arena and __arena_nullable argument tests selftests/bpf: Add JIT-sequence tests for __arena kfunc arguments selftests/bpf: Add struct_ops __arena and __arena_nullable argument tests bpf, x86: Fix stack-passed arguments for indirect trampolines selftests/bpf: Test stack-passed struct_ops arena arguments Documentation/bpf/kfuncs.rst | 39 +++ arch/x86/net/bpf_jit_comp.c | 129 ++++++++- include/linux/bpf.h | 25 ++ include/linux/filter.h | 1 + kernel/bpf/bpf_struct_ops.c | 34 ++- kernel/bpf/btf.c | 28 +- kernel/bpf/core.c | 5 + kernel/bpf/trampoline.c | 64 +++++ kernel/bpf/verifier.c | 63 ++++- .../selftests/bpf/prog_tests/arena_kfunc.c | 15 + .../bpf/prog_tests/arena_kfunc_jit.c | 13 + .../bpf/prog_tests/test_struct_ops_arena.c | 74 +++++ .../testing/selftests/bpf/progs/arena_kfunc.c | 260 ++++++++++++++++++ .../selftests/bpf/progs/arena_kfunc_jit.c | 96 +++++++ .../selftests/bpf/progs/struct_ops_arena.c | 115 ++++++++ .../bpf/progs/struct_ops_arena_fail.c | 20 ++ .../selftests/bpf/test_kmods/bpf_testmod.c | 95 +++++++ .../selftests/bpf/test_kmods/bpf_testmod.h | 6 + .../bpf/test_kmods/bpf_testmod_kfunc.h | 13 + 19 files changed, 1062 insertions(+), 33 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_kfunc.c create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_kfunc_jit.c create mode 100644 tools/testing/selftests/bpf/prog_tests/test_struct_ops_arena.c create mode 100644 tools/testing/selftests/bpf/progs/arena_kfunc.c create mode 100644 tools/testing/selftests/bpf/progs/arena_kfunc_jit.c create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_arena.c create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_arena_fail.c base-commit: 60781269e26c786de2bb93fb1e697a5c32ccee48 -- 2.53.0