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025bd7c753
This test uses bpf_get_branch_snapshot from a fexit program. The test uses a target function (bpf_testmod_loop_test) and compares the record against kallsyms. If there isn't enough record matching kallsyms, the test fails. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20210910183352.3151445-4-songliubraving@fb.com
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <test_progs.h>
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#include "test_module_attach.skel.h"
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static int duration;
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static int delete_module(const char *name, int flags)
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{
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return syscall(__NR_delete_module, name, flags);
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}
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void test_module_attach(void)
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{
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const int READ_SZ = 456;
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const int WRITE_SZ = 457;
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struct test_module_attach* skel;
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struct test_module_attach__bss *bss;
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struct bpf_link *link;
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int err;
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skel = test_module_attach__open();
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if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
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return;
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err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
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0, "bpf_testmod_test_read");
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ASSERT_OK(err, "set_attach_target");
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err = test_module_attach__load(skel);
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if (CHECK(err, "skel_load", "failed to load skeleton\n"))
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return;
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bss = skel->bss;
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err = test_module_attach__attach(skel);
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if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
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goto cleanup;
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/* trigger tracepoint */
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ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
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ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
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ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
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ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
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ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
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ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
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ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
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ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
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ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
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ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
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test_module_attach__detach(skel);
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/* attach fentry/fexit and make sure it get's module reference */
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link = bpf_program__attach(skel->progs.handle_fentry);
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if (!ASSERT_OK_PTR(link, "attach_fentry"))
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goto cleanup;
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ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
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bpf_link__destroy(link);
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link = bpf_program__attach(skel->progs.handle_fexit);
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if (!ASSERT_OK_PTR(link, "attach_fexit"))
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goto cleanup;
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ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
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bpf_link__destroy(link);
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cleanup:
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test_module_attach__destroy(skel);
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}
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