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kernel
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linux
selftests/bpf: Add BTF.ext line/func info getter tests
Add selftests checking that line and func info retrieved by newly added
libbpf APIs are the same as returned by kernel via bpf_prog_get_info_by_fd.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250408234417.452565-3-mykyta.yatsenko5@gmail.com
authored by
Mykyta Yatsenko
and committed by
Andrii Nakryiko
b8390dd1
243d720e
+86
+64
tools/testing/selftests/bpf/prog_tests/test_btf_ext.c
+64
tools/testing/selftests/bpf/prog_tests/test_btf_ext.c
···
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2025 Meta Platforms Inc. */
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#include <test_progs.h>
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#include "test_btf_ext.skel.h"
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#include "btf_helpers.h"
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static void subtest_line_func_info(void)
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{
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struct test_btf_ext *skel;
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struct bpf_prog_info info;
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struct bpf_line_info line_info[128], *libbpf_line_info;
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struct bpf_func_info func_info[128], *libbpf_func_info;
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__u32 info_len = sizeof(info), libbbpf_line_info_cnt, libbbpf_func_info_cnt;
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int err, fd;
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skel = test_btf_ext__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
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return;
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fd = bpf_program__fd(skel->progs.global_func);
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memset(&info, 0, sizeof(info));
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info.line_info = ptr_to_u64(&line_info);
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info.nr_line_info = sizeof(line_info);
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info.line_info_rec_size = sizeof(*line_info);
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err = bpf_prog_get_info_by_fd(fd, &info, &info_len);
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if (!ASSERT_OK(err, "prog_line_info"))
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goto out;
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libbpf_line_info = bpf_program__line_info(skel->progs.global_func);
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libbbpf_line_info_cnt = bpf_program__line_info_cnt(skel->progs.global_func);
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memset(&info, 0, sizeof(info));
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info.func_info = ptr_to_u64(&func_info);
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info.nr_func_info = sizeof(func_info);
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info.func_info_rec_size = sizeof(*func_info);
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err = bpf_prog_get_info_by_fd(fd, &info, &info_len);
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if (!ASSERT_OK(err, "prog_func_info"))
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goto out;
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libbpf_func_info = bpf_program__func_info(skel->progs.global_func);
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libbbpf_func_info_cnt = bpf_program__func_info_cnt(skel->progs.global_func);
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if (!ASSERT_OK_PTR(libbpf_line_info, "bpf_program__line_info"))
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goto out;
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if (!ASSERT_EQ(libbbpf_line_info_cnt, info.nr_line_info, "line_info_cnt"))
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goto out;
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if (!ASSERT_OK_PTR(libbpf_func_info, "bpf_program__func_info"))
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goto out;
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if (!ASSERT_EQ(libbbpf_func_info_cnt, info.nr_func_info, "func_info_cnt"))
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goto out;
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ASSERT_MEMEQ(libbpf_line_info, line_info, libbbpf_line_info_cnt * sizeof(*line_info),
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"line_info");
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ASSERT_MEMEQ(libbpf_func_info, func_info, libbbpf_func_info_cnt * sizeof(*func_info),
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"func_info");
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out:
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test_btf_ext__destroy(skel);
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}
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void test_btf_ext(void)
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{
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if (test__start_subtest("line_func_info"))
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subtest_line_func_info();
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}
+22
tools/testing/selftests/bpf/progs/test_btf_ext.c
+22
tools/testing/selftests/bpf/progs/test_btf_ext.c
···
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2025 Meta Platforms Inc. */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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__noinline static void f0(void)
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{
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__u64 a = 1;
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__sink(a);
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}
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SEC("xdp")
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__u64 global_func(struct xdp_md *xdp)
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{
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f0();
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return XDP_DROP;
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}