Commit b4abee7c authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Alexei Starovoitov
Browse files

selftests/bpf: add bpf_wq tests 



We simply try in all supported map types if we can store/load a bpf_wq.

Signed-off-by: default avatarBenjamin Tissoires <bentiss@kernel.org>
Link: https://lore.kernel.org/r/20240420-bpf_wq-v2-10-6c986a5a741f@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 246331e3

tools/testing/selftests/bpf/prog_tests/wq.c

0 → 100644
+11 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2024 Benjamin Tissoires */

#include <test_progs.h>

#include "wq.skel.h"



void serial_test_wq(void)

{

	LIBBPF_OPTS(bpf_test_run_opts, topts);



	RUN_TESTS(wq);

}

tools/testing/selftests/bpf/progs/wq.c

0 → 100644
+129 −0
Original line number Diff line number Diff line 
// 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");



static int test_elem_callback(void *map, int *key)

{

	struct elem init = {}, *val;



	if (map == &lru &&

	    bpf_map_update_elem(map, key, &init, 0))

		return -1;



	val = bpf_map_lookup_elem(map, key);

	if (!val)

		return -2;



	return 0;

}



static int test_hmap_elem_callback(void *map, int *key)

{

	struct hmap_elem init = {}, *val;



	if (bpf_map_update_elem(map, key, &init, 0))

		return -1;



	val = bpf_map_lookup_elem(map, key);

	if (!val)

		return -2;



	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);

}



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);

}



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);

}



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);

}



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);

}