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Message-ID: <CAEf4BzZ+6SN4BRFKEBePqyjB2-Xw49tKa3rpmxt8-qDwONXC8w@mail.gmail.com>
Date: Fri, 4 Mar 2022 15:11:23 -0800
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 09/10] selftest/bpf: Add kprobe_multi attach test
On Tue, Feb 22, 2022 at 9:08 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding kprobe_multi attach test that uses new fprobe interface to
> attach kprobe program to multiple functions.
>
> The test is attaching programs to bpf_fentry_test* functions and
> uses single trampoline program bpf_prog_test_run to trigger
> bpf_fentry_test* functions.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
subj typo: selftest -> selftests
> .../bpf/prog_tests/kprobe_multi_test.c | 115 ++++++++++++++++++
> .../selftests/bpf/progs/kprobe_multi.c | 58 +++++++++
> 2 files changed, 173 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
> create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi.c
>
[...]
> +
> +static void test_link_api_addrs(void)
> +{
> + DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
> + __u64 addrs[8];
> +
> + kallsyms_find("bpf_fentry_test1", &addrs[0]);
> + kallsyms_find("bpf_fentry_test2", &addrs[1]);
> + kallsyms_find("bpf_fentry_test3", &addrs[2]);
> + kallsyms_find("bpf_fentry_test4", &addrs[3]);
> + kallsyms_find("bpf_fentry_test5", &addrs[4]);
> + kallsyms_find("bpf_fentry_test6", &addrs[5]);
> + kallsyms_find("bpf_fentry_test7", &addrs[6]);
> + kallsyms_find("bpf_fentry_test8", &addrs[7]);
ASSERT_OK() that symbols are found? It also sucks that we re-parse
kallsyms so much...
maybe use load_kallsyms() to pre-cache? We should also teach
load_kallsyms() to not reload kallsyms more than once
> +
> + opts.kprobe_multi.addrs = (__u64) addrs;
> + opts.kprobe_multi.cnt = 8;
ARRAY_SIZE()?
> + test_link_api(&opts);
> +}
> +
> +static void test_link_api_syms(void)
> +{
> + DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
nit: just LIBBPF_OPTS
> + const char *syms[8] = {
> + "bpf_fentry_test1",
> + "bpf_fentry_test2",
> + "bpf_fentry_test3",
> + "bpf_fentry_test4",
> + "bpf_fentry_test5",
> + "bpf_fentry_test6",
> + "bpf_fentry_test7",
> + "bpf_fentry_test8",
> + };
> +
> + opts.kprobe_multi.syms = (__u64) syms;
> + opts.kprobe_multi.cnt = 8;
ARRAY_SIZE() ?
> + test_link_api(&opts);
> +}
> +
> +void test_kprobe_multi_test(void)
> +{
> + test_skel_api();
> + test_link_api_syms();
> + test_link_api_addrs();
model as subtests?
> +}
> diff --git a/tools/testing/selftests/bpf/progs/kprobe_multi.c b/tools/testing/selftests/bpf/progs/kprobe_multi.c
> new file mode 100644
> index 000000000000..71318c65931c
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/kprobe_multi.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +#include <bpf/bpf_tracing.h>
> +
> +char _license[] SEC("license") = "GPL";
> +
> +extern const void bpf_fentry_test1 __ksym;
> +extern const void bpf_fentry_test2 __ksym;
> +extern const void bpf_fentry_test3 __ksym;
> +extern const void bpf_fentry_test4 __ksym;
> +extern const void bpf_fentry_test5 __ksym;
> +extern const void bpf_fentry_test6 __ksym;
> +extern const void bpf_fentry_test7 __ksym;
> +extern const void bpf_fentry_test8 __ksym;
> +
> +/* No tests, just to trigger bpf_fentry_test* through tracing test_run */
> +SEC("fentry/bpf_modify_return_test")
> +int BPF_PROG(test1)
> +{
> + return 0;
> +}
> +
> +__u64 test2_result = 0;
> +
> +SEC("kprobe.multi/bpf_fentry_test?")
> +int test2(struct pt_regs *ctx)
> +{
> + __u64 addr = bpf_get_func_ip(ctx);
> +
> + test2_result += (const void *) addr == &bpf_fentry_test1 ||
> + (const void *) addr == &bpf_fentry_test2 ||
> + (const void *) addr == &bpf_fentry_test3 ||
> + (const void *) addr == &bpf_fentry_test4 ||
> + (const void *) addr == &bpf_fentry_test5 ||
> + (const void *) addr == &bpf_fentry_test6 ||
> + (const void *) addr == &bpf_fentry_test7 ||
> + (const void *) addr == &bpf_fentry_test8;
> + return 0;
> +}
> +
> +__u64 test3_result = 0;
> +
> +SEC("kretprobe.multi/bpf_fentry_test*")
> +int test3(struct pt_regs *ctx)
> +{
> + __u64 addr = bpf_get_func_ip(ctx);
> +
> + test3_result += (const void *) addr == &bpf_fentry_test1 ||
> + (const void *) addr == &bpf_fentry_test2 ||
> + (const void *) addr == &bpf_fentry_test3 ||
> + (const void *) addr == &bpf_fentry_test4 ||
> + (const void *) addr == &bpf_fentry_test5 ||
> + (const void *) addr == &bpf_fentry_test6 ||
> + (const void *) addr == &bpf_fentry_test7 ||
> + (const void *) addr == &bpf_fentry_test8;
> + return 0;
> +}
> --
> 2.35.1
>
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