Commit accb9a7e authored by KaFai Wan's avatar KaFai Wan Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add test for unpinning htab with internal timer struct 



Add test to verify that unpinning hash tables containing internal timer
structures does not trigger context warnings.

Each subtest (timer_prealloc and timer_no_prealloc) can trigger the
context warning when unpinning, but the warning cannot be triggered
twice within a short time interval (a HZ), which is expected behavior.

Signed-off-by: default avatarKaFai Wan <kafai.wan@linux.dev>
Acked-by: default avatarYonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20251008102628.808045-3-kafai.wan@linux.dev


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 4f375ade

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

0 → 100644
+36 −0
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// SPDX-License-Identifier: GPL-2.0



#include <test_progs.h>

#include "test_pinning_htab.skel.h"



static void unpin_map(const char *map_name, const char *pin_path)

{

	struct test_pinning_htab *skel;

	struct bpf_map *map;

	int err;



	skel = test_pinning_htab__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel open_and_load"))

		return;



	map = bpf_object__find_map_by_name(skel->obj, map_name);

	if (!ASSERT_OK_PTR(map, "bpf_object__find_map_by_name"))

		goto out;



	err = bpf_map__pin(map, pin_path);

	if (!ASSERT_OK(err, "bpf_map__pin"))

		goto out;



	err = bpf_map__unpin(map, pin_path);

	ASSERT_OK(err, "bpf_map__unpin");

out:

	test_pinning_htab__destroy(skel);

}



void test_pinning_htab(void)

{

	if (test__start_subtest("timer_prealloc"))

		unpin_map("timer_prealloc", "/sys/fs/bpf/timer_prealloc");

	if (test__start_subtest("timer_no_prealloc"))

		unpin_map("timer_no_prealloc", "/sys/fs/bpf/timer_no_prealloc");

}

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

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+25 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#include "vmlinux.h"

#include <bpf/bpf_helpers.h>



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



struct timer_val {

	struct bpf_timer timer;

};



struct {

	__uint(type, BPF_MAP_TYPE_HASH);

	__type(key, __u32);

	__type(value, struct timer_val);

	__uint(max_entries, 1);

} timer_prealloc SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_HASH);

	__type(key, __u32);

	__type(value, struct timer_val);

	__uint(max_entries, 1);

	__uint(map_flags, BPF_F_NO_PREALLOC);

} timer_no_prealloc SEC(".maps");