netdev - [PATCH v2 bpf-next 0/4] bpf: Add detection of kfuncs.

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Date:   Fri, 17 Mar 2023 13:19:16 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     davem@...emloft.net
Cc:     daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
        void@...ifault.com, davemarchevsky@...a.com, tj@...nel.org,
        memxor@...il.com, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...com
Subject: [PATCH v2 bpf-next 0/4] bpf: Add detection of kfuncs.

From: Alexei Starovoitov <ast@...nel.org>

Allow BPF programs detect at load time whether particular kfunc exists.

Patch 1: Allow ld_imm64 to point to kfunc in the kernel.
Patch 2: Fix relocation of kfunc in ld_imm64 insn when kfunc is in kernel module.
Patch 3: Introduce bpf_ksym_exists() macro.
Patch 4: selftest.

NOTE: detection of kfuncs from light skeleton is not supported yet.

Alexei Starovoitov (4):
  bpf: Allow ld_imm64 instruction to point to kfunc.
  libbpf: Fix relocation of kfunc ksym in ld_imm64 insn.
  libbpf: Introduce bpf_ksym_exists() macro.
  selftests/bpf: Add test for bpf_ksym_exists().

 kernel/bpf/verifier.c                         | 17 ++++++++++------
 tools/lib/bpf/bpf_helpers.h                   |  3 +++
 tools/lib/bpf/libbpf.c                        |  6 ++++++
 .../selftests/bpf/progs/task_kfunc_success.c  | 20 ++++++++++++++++++-
 4 files changed, 39 insertions(+), 7 deletions(-)

-- 
2.34.1