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Date: Wed, 7 Sep 2022 19:16:31 +0200
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v11 1/7] selftests/bpf: regroup and declare
similar kfuncs selftests in an array
On Tue, 6 Sept 2022 at 17:13, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
>
> Similar to tools/testing/selftests/bpf/prog_tests/dynptr.c:
> we declare an array of tests that we run one by one in a for loop.
>
> Followup patches will add more similar-ish tests, so avoid a lot of copy
> paste by grouping the declaration in an array.
>
> For light skeletons, we have to rely on the offsetof() macro so we can
> statically declare which program we are using.
> In the libbpf case, we can rely on bpf_object__find_program_by_name().
> So also change the Makefile to generate both light skeletons and normal
> ones.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>
> ---
Acked-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
>
> changes in v11:
> - use of both light skeletons and normal libbpf
>
> new in v10
> ---
> tools/testing/selftests/bpf/Makefile | 5 +-
> .../selftests/bpf/prog_tests/kfunc_call.c | 81 +++++++++++++++----
> 2 files changed, 68 insertions(+), 18 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index eecad99f1735..314216d77b8d 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -351,11 +351,12 @@ LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h \
> test_subskeleton.skel.h test_subskeleton_lib.skel.h \
> test_usdt.skel.h
>
> -LSKELS := kfunc_call_test.c fentry_test.c fexit_test.c fexit_sleep.c \
> +LSKELS := fentry_test.c fexit_test.c fexit_sleep.c \
> test_ringbuf.c atomics.c trace_printk.c trace_vprintk.c \
> map_ptr_kern.c core_kern.c core_kern_overflow.c
> # Generate both light skeleton and libbpf skeleton for these
> -LSKELS_EXTRA := test_ksyms_module.c test_ksyms_weak.c kfunc_call_test_subprog.c
> +LSKELS_EXTRA := test_ksyms_module.c test_ksyms_weak.c kfunc_call_test.c \
> + kfunc_call_test_subprog.c
> SKEL_BLACKLIST += $$(LSKELS)
>
> test_static_linked.skel.h-deps := test_static_linked1.o test_static_linked2.o
> diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
> index eede7c304f86..9dfbe5355a2d 100644
> --- a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
> +++ b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
> @@ -2,6 +2,7 @@
> /* Copyright (c) 2021 Facebook */
> #include <test_progs.h>
> #include <network_helpers.h>
> +#include "kfunc_call_test.skel.h"
> #include "kfunc_call_test.lskel.h"
> #include "kfunc_call_test_subprog.skel.h"
> #include "kfunc_call_test_subprog.lskel.h"
> @@ -9,9 +10,31 @@
>
> #include "cap_helpers.h"
>
> -static void test_main(void)
> +struct kfunc_test_params {
> + const char *prog_name;
> + unsigned long lskel_prog_desc_offset;
> + int retval;
> +};
> +
> +#define TC_TEST(name, __retval) \
> + { \
> + .prog_name = #name, \
> + .lskel_prog_desc_offset = offsetof(struct kfunc_call_test_lskel, progs.name), \
> + .retval = __retval, \
> + }
> +
> +static struct kfunc_test_params kfunc_tests[] = {
> + TC_TEST(kfunc_call_test1, 12),
> + TC_TEST(kfunc_call_test2, 3),
> + TC_TEST(kfunc_call_test_ref_btf_id, 0),
> +};
> +
> +static void verify_success(struct kfunc_test_params *param)
> {
> - struct kfunc_call_test_lskel *skel;
> + struct kfunc_call_test_lskel *lskel = NULL;
> + struct bpf_prog_desc *lskel_prog;
> + struct kfunc_call_test *skel;
> + struct bpf_program *prog;
> int prog_fd, err;
> LIBBPF_OPTS(bpf_test_run_opts, topts,
> .data_in = &pkt_v4,
> @@ -19,26 +42,53 @@ static void test_main(void)
> .repeat = 1,
> );
>
> - skel = kfunc_call_test_lskel__open_and_load();
> + /* first test with normal libbpf */
> + skel = kfunc_call_test__open_and_load();
> if (!ASSERT_OK_PTR(skel, "skel"))
> return;
>
> - prog_fd = skel->progs.kfunc_call_test1.prog_fd;
> - err = bpf_prog_test_run_opts(prog_fd, &topts);
> - ASSERT_OK(err, "bpf_prog_test_run(test1)");
> - ASSERT_EQ(topts.retval, 12, "test1-retval");
> + prog = bpf_object__find_program_by_name(skel->obj, param->prog_name);
> + if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
> + goto cleanup;
>
> - prog_fd = skel->progs.kfunc_call_test2.prog_fd;
> + prog_fd = bpf_program__fd(prog);
> err = bpf_prog_test_run_opts(prog_fd, &topts);
> - ASSERT_OK(err, "bpf_prog_test_run(test2)");
> - ASSERT_EQ(topts.retval, 3, "test2-retval");
> + if (!ASSERT_OK(err, param->prog_name))
> + goto cleanup;
> +
> + if (!ASSERT_EQ(topts.retval, param->retval, "retval"))
> + goto cleanup;
> +
> + /* second test with light skeletons */
> + lskel = kfunc_call_test_lskel__open_and_load();
> + if (!ASSERT_OK_PTR(lskel, "lskel"))
> + goto cleanup;
> +
> + lskel_prog = (struct bpf_prog_desc *)((char *)lskel + param->lskel_prog_desc_offset);
>
> - prog_fd = skel->progs.kfunc_call_test_ref_btf_id.prog_fd;
> + prog_fd = lskel_prog->prog_fd;
> err = bpf_prog_test_run_opts(prog_fd, &topts);
> - ASSERT_OK(err, "bpf_prog_test_run(test_ref_btf_id)");
> - ASSERT_EQ(topts.retval, 0, "test_ref_btf_id-retval");
> + if (!ASSERT_OK(err, param->prog_name))
> + goto cleanup;
> +
> + ASSERT_EQ(topts.retval, param->retval, "retval");
> +
> +cleanup:
> + kfunc_call_test__destroy(skel);
> + if (lskel)
> + kfunc_call_test_lskel__destroy(lskel);
> +}
> +
> +static void test_main(void)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(kfunc_tests); i++) {
> + if (!test__start_subtest(kfunc_tests[i].prog_name))
> + continue;
>
> - kfunc_call_test_lskel__destroy(skel);
> + verify_success(&kfunc_tests[i]);
> + }
> }
>
> static void test_subprog(void)
> @@ -121,8 +171,7 @@ static void test_destructive(void)
>
> void test_kfunc_call(void)
> {
> - if (test__start_subtest("main"))
> - test_main();
> + test_main();
>
> if (test__start_subtest("subprog"))
> test_subprog();
> --
> 2.36.1
>
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