linux-kernel - Re: [PATCH bpf-next v8 4/4] selftests/bpf: Add libbpf_probe_bpf

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Message-ID: <e52990a8-32d3-487e-ad1a-8ad95f322806@linux.dev>
Date: Sat, 22 Feb 2025 11:00:58 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: Eduard Zingerman <eddyz87@...il.com>, ast@...nel.org,
 daniel@...earbox.net, andrii@...nel.org, haoluo@...gle.com,
 jolsa@...nel.org, qmo@...nel.org
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, chen.dylane@...il.com,
 Tao Chen <dylane.chen@...iglobal.com>
Subject: Re: [PATCH bpf-next v8 4/4] selftests/bpf: Add libbpf_probe_bpf_kfunc
 API selftests

在 2025/2/22 02:19, Eduard Zingerman 写道:
> On Sat, 2025-02-22 at 00:33 +0800, Tao Chen wrote:
> 
> [...]
> 
>> +static const struct {
>> +	const char *name;
>> +	int code;
>> +} program_types[] = {
>> +#define _T(n) { #n, BPF_PROG_TYPE_##n }
>> +	_T(KPROBE),
>> +	_T(XDP),
>> +	_T(SYSCALL),
>> +	_T(SCHED_CLS),
>> +	_T(SCHED_ACT),
>> +	_T(SK_SKB),
>> +	_T(SOCKET_FILTER),
>> +	_T(CGROUP_SKB),
>> +	_T(LWT_OUT),
>> +	_T(LWT_IN),
>> +	_T(LWT_XMIT),
>> +	_T(LWT_SEG6LOCAL),
>> +	_T(NETFILTER),
>> +	_T(CGROUP_SOCK_ADDR),
>> +	_T(SCHED_ACT)
>> +#undef _T
>> +};
>> +
>> +void test_libbpf_probe_kfuncs_many(void)
>> +{
> 
> Hi Tao,
> 
> Sorry, probably some miscommunication from my side.
> I did not mean this test for inclusion, it was meant as a one time
> manual inspection of libbpf_probe_bpf_kfunc results.
> Just as a sanity check before series is merged.
> As an automated test it does not provide much meaningful signal.
> 

Ok, i will resend v8 without this case, and check all the prog types 
later with your program. Thanks.

>> +	int i, kfunc_id, ret, id;
>> +	const struct btf_type *t;
>> +	struct btf *btf = NULL;
>> +	const char *kfunc;
>> +	const char *tag;
>> +
>> +	btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
>> +	if (!ASSERT_OK_PTR(btf, "btf_parse"))
>> +		return;
>> +	for (id = 0; id < btf__type_cnt(btf); ++id) {
>> +		t = btf__type_by_id(btf, id);
>> +		if (!t)
>> +			continue;
>> +		if (!btf_is_decl_tag(t))
>> +			continue;
>> +		tag = btf__name_by_offset(btf, t->name_off);
>> +		if (strcmp(tag, "bpf_kfunc") != 0)
>> +			continue;
>> +		kfunc_id = t->type;
>> +		t = btf__type_by_id(btf, kfunc_id);
>> +		if (!btf_is_func(t))
>> +			continue;
>> +		kfunc = btf__name_by_offset(btf, t->name_off);
>> +		for (i = 0; i < ARRAY_SIZE(program_types); ++i) {
>> +			ret = libbpf_probe_bpf_kfunc(program_types[i].code,
>> +						     kfunc_id, -1, NULL);
>> +			if (ret < 0) {
>> +				ASSERT_FAIL("kfunc:%s use prog type:%d",
>> +				      kfunc, program_types[i].code);
>> +				goto cleanup;
>> +			}
>> +		}
>> +	}
>> +cleanup:
>> +	btf__free(btf);
>> +}
> 
> 


-- 
Best Regards
Tao Chen