linux-kernel - Re: [PATCH bpf-next v3 3/3] selftests/bpf: Add libbpf_probe_bpf

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Message-ID: <Z5O_bNToXdn01f4B@krava>
Date: Fri, 24 Jan 2025 17:27:24 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Tao Chen <chen.dylane@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
	eddyz87@...il.com, haoluo@...gle.com, qmo@...nel.org,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: Add
 libbpf_probe_bpf_kfunc API selftests

On Fri, Jan 24, 2025 at 10:44:11PM +0800, Tao Chen wrote:
> 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 <chen.dylane@...il.com>
> ---
>  .../selftests/bpf/prog_tests/libbpf_probes.c  | 35 +++++++++++++++++++
>  1 file changed, 35 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..d9d69941f694 100644
> --- a/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c
> +++ b/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c
> @@ -126,3 +126,38 @@ void test_libbpf_probe_helpers(void)
>  		ASSERT_EQ(res, d->supported, buf);
>  	}
>  }
> +
> +void test_libbpf_probe_kfuncs(void)
> +{
> +	int ret, kfunc_id;
> +	char *kfunc = "bpf_cpumask_create";
> +	struct btf *btf;
> +
> +	btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
> +	if (!ASSERT_OK_PTR(btf, "btf_parse"))
> +		return;
> +
> +	kfunc_id = btf__find_by_name_kind(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 = libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_SYSCALL, kfunc_id, 0, NULL);
> +	ASSERT_EQ(ret, 1, kfunc);
> +
> +	/* prog BPF_PROG_TYPE_KPROBE does not support kfunc bpf_cpumask_create */
> +	ret = libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_KPROBE, kfunc_id, 0, NULL);
> +	ASSERT_EQ(ret, 0, kfunc);
> +
> +	/* invalid kfunc id */
> +	ret = libbpf_probe_bpf_kfunc(BPF_PROG_TYPE_KPROBE, -1, 0, NULL);
> +	ASSERT_EQ(ret, 0, "invalid kfunc id:-1");
> +
> +	/* invalid prog type */
> +	ret = libbpf_probe_bpf_kfunc(100000, kfunc_id, 0, NULL);
> +	if (!ASSERT_LE(ret, 0, "invalid prog type:100000"))
> +		goto cleanup;

nit no need for the goto

jirka

> +
> +cleanup:
> +	btf__free(btf);
> +}
> -- 
> 2.43.0
>