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linux/tools/testing/selftests/bpf/prog_tests/map_kptr.c
Kumar Kartikeya Dwivedi 2669dde7a8 selftests/bpf: Fix map_kptr grace period wait 
Commit c27cea4416 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast")
broke map_kptr selftest since it removed the function we were kprobing.
Use a new kfunc that invokes call_rcu_tasks_trace and sets a program
provided pointer to an integer to 1. Technically this can be unsafe if
the memory being written to from the callback disappears, but this is
just for usage in a test where we ensure we spin until we see the value
to be set to 1, so it's ok.

Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Fixes: c27cea4416 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260211185747.3630539-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-02-13 14:14:27 -08:00

184 lines
6.1 KiB
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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
#include "map_kptr.skel.h"
#include "map_kptr_fail.skel.h"
#include "rcu_tasks_trace_gp.skel.h"
static void test_map_kptr_success(bool test_run)
{
LIBBPF_OPTS(bpf_test_run_opts, lopts);
LIBBPF_OPTS(bpf_test_run_opts, opts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
int key = 0, ret, cpu;
struct map_kptr *skel;
char buf[16], *pbuf;
skel = map_kptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
return;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref1), &opts);
ASSERT_OK(ret, "test_map_kptr_ref1 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref1 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref2), &opts);
ASSERT_OK(ret, "test_map_kptr_ref2 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref2 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref1), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref1 refcount");
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref1 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref2), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref2 refcount");
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref2 retval");
if (test_run)
goto exit;
cpu = libbpf_num_possible_cpus();
if (!ASSERT_GT(cpu, 0, "libbpf_num_possible_cpus"))
goto exit;
pbuf = calloc(cpu, sizeof(buf));
if (!ASSERT_OK_PTR(pbuf, "calloc(pbuf)"))
goto exit;
ret = bpf_map__update_elem(skel->maps.array_map,
&key, sizeof(key), buf, sizeof(buf), 0);
ASSERT_OK(ret, "array_map update");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__update_elem(skel->maps.pcpu_array_map,
&key, sizeof(key), pbuf, cpu * sizeof(buf), 0);
ASSERT_OK(ret, "pcpu_array_map update");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "hash_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.pcpu_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "pcpu_hash_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.hash_malloc_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "hash_malloc_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.pcpu_hash_malloc_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "pcpu_hash_malloc_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.lru_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "lru_hash_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.lru_pcpu_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "lru_pcpu_hash_map delete");
skel->data->ref--;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref_del), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref_del delete");
skel->data->ref--;
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref_del retval");
free(pbuf);
exit:
map_kptr__destroy(skel);
}
static int kern_sync_rcu_tasks_trace(struct rcu_tasks_trace_gp *rcu)
{
LIBBPF_OPTS(bpf_test_run_opts, opts);
int ret;
WRITE_ONCE(rcu->bss->done, 0);
ret = bpf_prog_test_run_opts(bpf_program__fd(rcu->progs.call_rcu_tasks_trace), &opts);
if (!ASSERT_OK(ret, "call_rcu_tasks_trace"))
return -EFAULT;
if (!ASSERT_OK(opts.retval, "call_rcu_tasks_trace retval"))
return -EFAULT;
while (!READ_ONCE(rcu->bss->done))
sched_yield();
return 0;
}
static void wait_for_map_release(void)
{
LIBBPF_OPTS(bpf_test_run_opts, lopts);
struct map_kptr *skel;
int ret;
skel = map_kptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
return;
do {
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.count_ref), &lopts);
ASSERT_OK(ret, "count_ref ret");
ASSERT_OK(lopts.retval, "count_ref retval");
} while (skel->bss->num_of_refs != 2);
map_kptr__destroy(skel);
}
void serial_test_map_kptr(void)
{
struct rcu_tasks_trace_gp *skel;
RUN_TESTS(map_kptr_fail);
skel = rcu_tasks_trace_gp__open_and_load();
if (!ASSERT_OK_PTR(skel, "rcu_tasks_trace_gp__open_and_load"))
return;
if (test__start_subtest("success-map")) {
test_map_kptr_success(true);
ASSERT_OK(kern_sync_rcu_tasks_trace(skel), "sync rcu_tasks_trace");
ASSERT_OK(kern_sync_rcu(), "sync rcu");
wait_for_map_release();
/* Observe refcount dropping to 1 on bpf_map_free_deferred */
test_map_kptr_success(false);
ASSERT_OK(kern_sync_rcu_tasks_trace(skel), "sync rcu_tasks_trace");
ASSERT_OK(kern_sync_rcu(), "sync rcu");
wait_for_map_release();
/* Observe refcount dropping to 1 on synchronous delete elem */
test_map_kptr_success(true);
}
rcu_tasks_trace_gp__destroy(skel);
}
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