summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/progs/wq.c
blob: 49e712acbf60042f91e2ff4f49cd7920d358426f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Benjamin Tissoires
 */

#include "bpf_experimental.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "../bpf_testmod/bpf_testmod_kfunc.h"

char _license[] SEC("license") = "GPL";

struct hmap_elem {
	int counter;
	struct bpf_timer timer; /* unused */
	struct bpf_spin_lock lock; /* unused */
	struct bpf_wq work;
};

struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(max_entries, 1000);
	__type(key, int);
	__type(value, struct hmap_elem);
} hmap SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(map_flags, BPF_F_NO_PREALLOC);
	__uint(max_entries, 1000);
	__type(key, int);
	__type(value, struct hmap_elem);
} hmap_malloc SEC(".maps");

struct elem {
	struct bpf_wq w;
};

struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 2);
	__type(key, int);
	__type(value, struct elem);
} array SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_LRU_HASH);
	__uint(max_entries, 4);
	__type(key, int);
	__type(value, struct elem);
} lru SEC(".maps");

__u32 ok;
__u32 ok_sleepable;

static int test_elem_callback(void *map, int *key,
		int (callback_fn)(void *map, int *key, struct bpf_wq *wq))
{
	struct elem init = {}, *val;
	struct bpf_wq *wq;

	if ((ok & (1 << *key) ||
	    (ok_sleepable & (1 << *key))))
		return -22;

	if (map == &lru &&
	    bpf_map_update_elem(map, key, &init, 0))
		return -1;

	val = bpf_map_lookup_elem(map, key);
	if (!val)
		return -2;

	wq = &val->w;
	if (bpf_wq_init(wq, map, 0) != 0)
		return -3;

	if (bpf_wq_set_callback(wq, callback_fn, 0))
		return -4;

	if (bpf_wq_start(wq, 0))
		return -5;

	return 0;
}

static int test_hmap_elem_callback(void *map, int *key,
		int (callback_fn)(void *map, int *key, struct bpf_wq *wq))
{
	struct hmap_elem init = {}, *val;
	struct bpf_wq *wq;

	if ((ok & (1 << *key) ||
	    (ok_sleepable & (1 << *key))))
		return -22;

	if (bpf_map_update_elem(map, key, &init, 0))
		return -1;

	val = bpf_map_lookup_elem(map, key);
	if (!val)
		return -2;

	wq = &val->work;
	if (bpf_wq_init(wq, map, 0) != 0)
		return -3;

	if (bpf_wq_set_callback(wq, callback_fn, 0))
		return -4;

	if (bpf_wq_start(wq, 0))
		return -5;

	return 0;
}

/* callback for non sleepable workqueue */
static int wq_callback(void *map, int *key, struct bpf_wq *work)
{
	bpf_kfunc_common_test();
	ok |= (1 << *key);
	return 0;
}

/* callback for sleepable workqueue */
static int wq_cb_sleepable(void *map, int *key, struct bpf_wq *work)
{
	bpf_kfunc_call_test_sleepable();
	ok_sleepable |= (1 << *key);
	return 0;
}

SEC("tc")
/* test that workqueues can be used from an array */
__retval(0)
long test_call_array_sleepable(void *ctx)
{
	int key = 0;

	return test_elem_callback(&array, &key, wq_cb_sleepable);
}

SEC("syscall")
/* Same test than above but from a sleepable context. */
__retval(0)
long test_syscall_array_sleepable(void *ctx)
{
	int key = 1;

	return test_elem_callback(&array, &key, wq_cb_sleepable);
}

SEC("tc")
/* test that workqueues can be used from a hashmap */
__retval(0)
long test_call_hash_sleepable(void *ctx)
{
	int key = 2;

	return test_hmap_elem_callback(&hmap, &key, wq_callback);
}

SEC("tc")
/* test that workqueues can be used from a hashmap with NO_PREALLOC. */
__retval(0)
long test_call_hash_malloc_sleepable(void *ctx)
{
	int key = 3;

	return test_hmap_elem_callback(&hmap_malloc, &key, wq_callback);
}

SEC("tc")
/* test that workqueues can be used from a LRU map */
__retval(0)
long test_call_lru_sleepable(void *ctx)
{
	int key = 4;

	return test_elem_callback(&lru, &key, wq_callback);
}