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selftests/bpf: add test for bpf_for_each_map_elem() with different maps

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A test is added for bpf_for_each_map_elem() with either an arraymap or a
hashmap.
$ tools/testing/selftests/bpf/test_progs -t for_each
 #93/1    for_each/hash_map:OK
 #93/2    for_each/array_map:OK
 #93/3    for_each/write_map_key:OK
 #93/4    for_each/multi_maps:OK
 #93      for_each:OK
Summary: 1/4 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Philo Lu <lulie@linux.alibaba.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240405025536.18113-4-lulie@linux.alibaba.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Philo Lu 2024-04-05 10:55:36 +08:00 committed by Alexei Starovoitov
parent 9d482da9e1
commit fecb1597cc
2 changed files with 111 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
tools/testing/selftests/bpf/prog_tests/for_each.c
View File

@ -5,6 +5,7 @@
#include "for_each_hash_map_elem.skel.h"
#include "for_each_array_map_elem.skel.h"
#include "for_each_map_elem_write_key.skel.h"
#include "for_each_multi_maps.skel.h"
static unsigned int duration;
@ -143,6 +144,65 @@ static void test_write_map_key(void)
for_each_map_elem_write_key__destroy(skel);
}
static void test_multi_maps(void)
{
struct for_each_multi_maps *skel;
__u64 val, array_total, hash_total;
__u32 key, max_entries;
int i, err;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
skel = for_each_multi_maps__open_and_load();
if (!ASSERT_OK_PTR(skel, "for_each_multi_maps__open_and_load"))
return;
array_total = 0;
max_entries = bpf_map__max_entries(skel->maps.arraymap);
for (i = 0; i < max_entries; i++) {
key = i;
val = i + 1;
array_total += val;
err = bpf_map__update_elem(skel->maps.arraymap, &key, sizeof(key),
&val, sizeof(val), BPF_ANY);
if (!ASSERT_OK(err, "array_map_update"))
goto out;
}
hash_total = 0;
max_entries = bpf_map__max_entries(skel->maps.hashmap);
for (i = 0; i < max_entries; i++) {
key = i + 100;
val = i + 1;
hash_total += val;
err = bpf_map__update_elem(skel->maps.hashmap, &key, sizeof(key),
&val, sizeof(val), BPF_ANY);
if (!ASSERT_OK(err, "hash_map_update"))
goto out;
}
skel->bss->data_output = 0;
skel->bss->use_array = 1;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_pkt_access), &topts);
ASSERT_OK(err, "bpf_prog_test_run_opts");
ASSERT_OK(topts.retval, "retval");
ASSERT_EQ(skel->bss->data_output, array_total, "array output");
skel->bss->data_output = 0;
skel->bss->use_array = 0;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_pkt_access), &topts);
ASSERT_OK(err, "bpf_prog_test_run_opts");
ASSERT_OK(topts.retval, "retval");
ASSERT_EQ(skel->bss->data_output, hash_total, "hash output");
out:
for_each_multi_maps__destroy(skel);
}
void test_for_each(void)
{
if (test__start_subtest("hash_map"))
@ -151,4 +211,6 @@ void test_for_each(void)
test_array_map();
if (test__start_subtest("write_map_key"))
test_write_map_key();
if (test__start_subtest("multi_maps"))
test_multi_maps();
}

49
tools/testing/selftests/bpf/progs/for_each_multi_maps.c Normal file
View File

@ -0,0 +1,49 @@
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 3);
__type(key, __u32);
__type(value, __u64);
} arraymap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 5);
__type(key, __u32);
__type(value, __u64);
} hashmap SEC(".maps");
struct callback_ctx {
int output;
};
u32 data_output = 0;
int use_array = 0;
static __u64
check_map_elem(struct bpf_map *map, __u32 *key, __u64 *val,
struct callback_ctx *data)
{
data->output += *val;
return 0;
}
SEC("tc")
int test_pkt_access(struct __sk_buff *skb)
{
struct callback_ctx data;
data.output = 0;
if (use_array)
bpf_for_each_map_elem(&arraymap, check_map_elem, &data, 0);
else
bpf_for_each_map_elem(&hashmap, check_map_elem, &data, 0);
data_output = data.output;
return 0;
}