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Sun, 09 Feb 2025 22:00:15 -0800 (PST) Received: from localhost ([111.229.209.227]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2fa0f71b6dbsm7382479a91.27.2025.02.09.22.00.14 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 09 Feb 2025 22:00:15 -0800 (PST) From: Tao Chen To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, haoluo@google.com, jolsa@kernel.org, qmo@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, chen.dylane@gmail.com Subject: [PATCH bpf-next v5 4/4] selftests/bpf: Add libbpf_probe_bpf_kfunc API selftests Date: Mon, 10 Feb 2025 13:59:45 +0800 Message-Id: <20250210055945.27192-5-chen.dylane@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250210055945.27192-1-chen.dylane@gmail.com> References: <20250210055945.27192-1-chen.dylane@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Add selftests for prog_kfunc feature probing. ./test_progs -t libbpf_probe_kfuncs #153 libbpf_probe_kfuncs:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Tao Chen --- .../selftests/bpf/prog_tests/libbpf_probes.c | 118 ++++++++++++++++++ 1 file changed, 118 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c b/tools= /testing/selftests/bpf/prog_tests/libbpf_probes.c index 4ed46ed58a7b..fc4c9dc2cbed 100644 --- a/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c +++ b/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c @@ -126,3 +126,121 @@ void test_libbpf_probe_helpers(void) ASSERT_EQ(res, d->supported, buf); } } + +static int module_btf_fd(char *module) +{ + int fd, err; + __u32 id =3D 0, len; + struct bpf_btf_info info; + char name[64]; + + while (true) { + err =3D bpf_btf_get_next_id(id, &id); + if (err && (errno =3D=3D ENOENT || errno =3D=3D EPERM)) + return 0; + if (err) { + err =3D -errno; + return err; + } + fd =3D bpf_btf_get_fd_by_id(id); + if (fd < 0) { + if (errno =3D=3D ENOENT) + continue; + err =3D -errno; + return err; + } + len =3D sizeof(info); + memset(&info, 0, sizeof(info)); + info.name =3D ptr_to_u64(name); + info.name_len =3D sizeof(name); + err =3D bpf_btf_get_info_by_fd(fd, &info, &len); + if (err) { + err =3D -errno; + goto err_out; + } + /* find target module btf */ + if (!strcmp(name, module)) + break; + + close(fd); + } + + return fd; +err_out: + close(fd); + return err; +} + +void test_libbpf_probe_kfuncs(void) +{ + int ret, kfunc_id, fd; + char *kfunc =3D "bpf_cpumask_create"; + struct btf *vmlinux_btf =3D NULL; + struct btf *module_btf =3D NULL; + + vmlinux_btf =3D btf__parse("/sys/kernel/btf/vmlinux", NULL); + if (!ASSERT_OK_PTR(vmlinux_btf, "btf_parse")) + return; + + kfunc_id =3D btf__find_by_name_kind(vmlinux_btf, kfunc, BTF_KIND_FUNC); + if (!ASSERT_GT(kfunc_id, 0, kfunc)) + goto cleanup; + + /* prog BPF_PROG_TYPE_SYSCALL supports kfunc bpf_cpumask_create */ + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_SYSCALL, kfunc_id, -1, NULL); + if (!ASSERT_EQ(ret, 1, "kfunc in vmlinux support")) + goto cleanup; + + /* prog BPF_PROG_TYPE_KPROBE does not support kfunc bpf_cpumask_create */ + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_KPROBE, kfunc_id, -1, NULL); + if (!ASSERT_EQ(ret, 0, "kfunc in vmlinux not suuport")) + goto cleanup; + + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_KPROBE, -1, -1, NULL); + if (!ASSERT_EQ(ret, 0, "invalid kfunc id:-1")) + goto cleanup; + + ret =3D libbpf_probe_bpf_kfunc(100000, kfunc_id, -1, NULL); + if (!ASSERT_ERR(ret, "invalid prog type:100000")) + goto cleanup; + + if (!env.has_testmod) + goto cleanup; + + module_btf =3D btf__load_module_btf("bpf_testmod", vmlinux_btf); + if (!ASSERT_OK_PTR(module_btf, "load module BTF")) + goto cleanup; + + kfunc_id =3D btf__find_by_name(module_btf, "bpf_kfunc_call_test1"); + if (!ASSERT_GT(kfunc_id, 0, "func not found")) + goto cleanup; + + fd =3D module_btf_fd("bpf_testmod"); + if (!ASSERT_GT(fd, 0, "module btf fd")) + goto cleanup; + + /* prog BPF_PROG_TYPE_SYSCALL supports kfunc bpf_kfunc_call_test1 in bpf_= testmod */ + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_SYSCALL, kfunc_id, fd, NULL); + if (!ASSERT_EQ(ret, 1, "kfunc in module btf support")) + goto cleanup_fd; + + /* prog BPF_PROG_TYPE_KPROBE does not support kfunc bpf_kfunc_call_test1 + * in bpf_testmod + */ + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_KPROBE, kfunc_id, fd, NULL); + if (!ASSERT_EQ(ret, 0, "kfunc in module btf not support")) + goto cleanup_fd; + + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_SYSCALL, -1, fd, NULL); + if (!ASSERT_EQ(ret, 0, "invalid kfunc id in module btf")) + goto cleanup_fd; + + ret =3D libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_SYSCALL, kfunc_id, 100, NULL= ); + ASSERT_EQ(ret, 0, "invalid btf fd in module btf"); + +cleanup_fd: + close(fd); +cleanup: + btf__free(vmlinux_btf); + btf__free(module_btf); +} --=20 2.43.0