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selftests/bpf: Add tests for BPF_F_PRESERVE_ELEMS

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Add tests for perf event array with and without BPF_F_PRESERVE_ELEMS.

Add a perf event to array via fd mfd. Without BPF_F_PRESERVE_ELEMS, the
perf event is removed when mfd is closed. With BPF_F_PRESERVE_ELEMS, the
perf event is removed when the map is freed.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200930224927.1936644-3-songliubraving@fb.com
This commit is contained in:
Song Liu 2020-09-30 15:49:27 -07:00 committed by Alexei Starovoitov
parent 792caccc45
commit d6b4206841
2 changed files with 104 additions and 0 deletions
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66
tools/testing/selftests/bpf/prog_tests/pe_preserve_elems.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
#include <linux/bpf.h>
#include "test_pe_preserve_elems.skel.h"
static int duration;
static void test_one_map(struct bpf_map *map, struct bpf_program *prog,
bool has_share_pe)
{
int err, key = 0, pfd = -1, mfd = bpf_map__fd(map);
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts);
struct perf_event_attr attr = {
.size = sizeof(struct perf_event_attr),
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_CPU_CLOCK,
};
pfd = syscall(__NR_perf_event_open, &attr, 0 /* pid */,
-1 /* cpu 0 */, -1 /* group id */, 0 /* flags */);
if (CHECK(pfd < 0, "perf_event_open", "failed\n"))
return;
err = bpf_map_update_elem(mfd, &key, &pfd, BPF_ANY);
close(pfd);
if (CHECK(err < 0, "bpf_map_update_elem", "failed\n"))
return;
err = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
if (CHECK(err < 0, "bpf_prog_test_run_opts", "failed\n"))
return;
if (CHECK(opts.retval != 0, "bpf_perf_event_read_value",
"failed with %d\n", opts.retval))
return;
/* closing mfd, prog still holds a reference on map */
close(mfd);
err = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
if (CHECK(err < 0, "bpf_prog_test_run_opts", "failed\n"))
return;
if (has_share_pe) {
CHECK(opts.retval != 0, "bpf_perf_event_read_value",
"failed with %d\n", opts.retval);
} else {
CHECK(opts.retval != -ENOENT, "bpf_perf_event_read_value",
"should have failed with %d, but got %d\n", -ENOENT,
opts.retval);
}
}
void test_pe_preserve_elems(void)
{
struct test_pe_preserve_elems *skel;
skel = test_pe_preserve_elems__open_and_load();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
test_one_map(skel->maps.array_1, skel->progs.read_array_1, false);
test_one_map(skel->maps.array_2, skel->progs.read_array_2, true);
test_pe_preserve_elems__destroy(skel);
}

38
tools/testing/selftests/bpf/progs/test_pe_preserve_elems.c Normal file
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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
struct {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__uint(max_entries, 1);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
} array_1 SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__uint(max_entries, 1);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
__uint(map_flags, BPF_F_PRESERVE_ELEMS);
} array_2 SEC(".maps");
SEC("raw_tp/sched_switch")
int BPF_PROG(read_array_1)
{
struct bpf_perf_event_value val;
return bpf_perf_event_read_value(&array_1, 0, &val, sizeof(val));
}
SEC("raw_tp/task_rename")
int BPF_PROG(read_array_2)
{
struct bpf_perf_event_value val;
return bpf_perf_event_read_value(&array_2, 0, &val, sizeof(val));
}
char LICENSE[] SEC("license") = "GPL";