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// 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 {
int ok_offset;
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, void *value))
{
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;
val->ok_offset = *key;
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, void *value))
{
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, void *value)
{
bpf_kfunc_common_test();
ok |= (1 << *key);
return 0;
}
/* callback for sleepable workqueue */
static int wq_cb_sleepable(void *map, int *key, void *value)
{
struct elem *data = (struct elem *)value;
int offset = data->ok_offset;
if (*key != offset)
return 0;
bpf_kfunc_call_test_sleepable();
ok_sleepable |= (1 << offset);
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);
}
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