github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-25 23:52:08 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

selftests/bpf: Test BPF_PROG_ASSOC_STRUCT_OPS command

Browse Source 
Test BPF_PROG_ASSOC_STRUCT_OPS command that associates a BPF program
with a struct_ops. The test follows the same logic in commit
ba7000f1c3 ("selftests/bpf: Test multi_st_ops and calling kfuncs from
different programs"), but instead of using map id to identify a specific
struct_ops, this test uses the new BPF command to associate a struct_ops
with a program.

The test consists of two sets of almost identical struct_ops maps and BPF
programs associated with the map. Their only difference is the unique
value returned by bpf_testmod_multi_st_ops::test_1().

The test first loads the programs and associates them with struct_ops
maps. Then, it exercises the BPF programs. They will in turn call kfunc
bpf_kfunc_multi_st_ops_test_1_prog_arg() to trigger test_1() of the
associated struct_ops map, and then check if the right unique value is
returned.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251203233748.668365-5-ameryhung@gmail.com
This commit is contained in:
Amery Hung 2025-12-03 15:37:46 -08:00 committed by Andrii Nakryiko
parent 87cd177b14
commit 33a165f9c2
4 changed files with 195 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
tools/testing/selftests/bpf/prog_tests/test_struct_ops_assoc.c Normal file
View File

@ -0,0 +1,72 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "struct_ops_assoc.skel.h"
static void test_st_ops_assoc(void)
{
struct struct_ops_assoc *skel = NULL;
int err, pid;
skel = struct_ops_assoc__open_and_load();
if (!ASSERT_OK_PTR(skel, "struct_ops_assoc__open"))
goto out;
/* cannot explicitly associate struct_ops program */
err = bpf_program__assoc_struct_ops(skel->progs.test_1_a,
skel->maps.st_ops_map_a, NULL);
ASSERT_ERR(err, "bpf_program__assoc_struct_ops(test_1_a, st_ops_map_a)");
err = bpf_program__assoc_struct_ops(skel->progs.syscall_prog_a,
skel->maps.st_ops_map_a, NULL);
ASSERT_OK(err, "bpf_program__assoc_struct_ops(syscall_prog_a, st_ops_map_a)");
err = bpf_program__assoc_struct_ops(skel->progs.sys_enter_prog_a,
skel->maps.st_ops_map_a, NULL);
ASSERT_OK(err, "bpf_program__assoc_struct_ops(sys_enter_prog_a, st_ops_map_a)");
err = bpf_program__assoc_struct_ops(skel->progs.syscall_prog_b,
skel->maps.st_ops_map_b, NULL);
ASSERT_OK(err, "bpf_program__assoc_struct_ops(syscall_prog_b, st_ops_map_b)");
err = bpf_program__assoc_struct_ops(skel->progs.sys_enter_prog_b,
skel->maps.st_ops_map_b, NULL);
ASSERT_OK(err, "bpf_program__assoc_struct_ops(sys_enter_prog_b, st_ops_map_b)");
/* sys_enter_prog_a already associated with map_a */
err = bpf_program__assoc_struct_ops(skel->progs.sys_enter_prog_a,
skel->maps.st_ops_map_b, NULL);
ASSERT_ERR(err, "bpf_program__assoc_struct_ops(sys_enter_prog_a, st_ops_map_b)");
err = struct_ops_assoc__attach(skel);
if (!ASSERT_OK(err, "struct_ops_assoc__attach"))
goto out;
/* run tracing prog that calls .test_1 and checks return */
pid = getpid();
skel->bss->test_pid = pid;
sys_gettid();
skel->bss->test_pid = 0;
ASSERT_EQ(skel->bss->test_err_a, 0, "skel->bss->test_err_a");
ASSERT_EQ(skel->bss->test_err_b, 0, "skel->bss->test_err_b");
/* run syscall_prog that calls .test_1 and checks return */
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.syscall_prog_a), NULL);
ASSERT_OK(err, "bpf_prog_test_run_opts");
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.syscall_prog_b), NULL);
ASSERT_OK(err, "bpf_prog_test_run_opts");
ASSERT_EQ(skel->bss->test_err_a, 0, "skel->bss->test_err_a");
ASSERT_EQ(skel->bss->test_err_b, 0, "skel->bss->test_err_b");
out:
struct_ops_assoc__destroy(skel);
}
void test_struct_ops_assoc(void)
{
if (test__start_subtest("st_ops_assoc"))
test_st_ops_assoc();
}

105
tools/testing/selftests/bpf/progs/struct_ops_assoc.c Normal file
View File

@ -0,0 +1,105 @@
// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "../test_kmods/bpf_testmod.h"
#include "../test_kmods/bpf_testmod_kfunc.h"
char _license[] SEC("license") = "GPL";
int test_pid;
/* Programs associated with st_ops_map_a */
#define MAP_A_MAGIC 1234
int test_err_a;
SEC("struct_ops")
int BPF_PROG(test_1_a, struct st_ops_args *args)
{
return MAP_A_MAGIC;
}
SEC("tp_btf/sys_enter")
int BPF_PROG(sys_enter_prog_a, struct pt_regs *regs, long id)
{
struct st_ops_args args = {};
struct task_struct *task;
int ret;
task = bpf_get_current_task_btf();
if (!test_pid || task->pid != test_pid)
return 0;
ret = bpf_kfunc_multi_st_ops_test_1_impl(&args, NULL);
if (ret != MAP_A_MAGIC)
test_err_a++;
return 0;
}
SEC("syscall")
int syscall_prog_a(void *ctx)
{
struct st_ops_args args = {};
int ret;
ret = bpf_kfunc_multi_st_ops_test_1_impl(&args, NULL);
if (ret != MAP_A_MAGIC)
test_err_a++;
return 0;
}
SEC(".struct_ops.link")
struct bpf_testmod_multi_st_ops st_ops_map_a = {
.test_1 = (void *)test_1_a,
};
/* Programs associated with st_ops_map_b */
#define MAP_B_MAGIC 5678
int test_err_b;
SEC("struct_ops")
int BPF_PROG(test_1_b, struct st_ops_args *args)
{
return MAP_B_MAGIC;
}
SEC("tp_btf/sys_enter")
int BPF_PROG(sys_enter_prog_b, struct pt_regs *regs, long id)
{
struct st_ops_args args = {};
struct task_struct *task;
int ret;
task = bpf_get_current_task_btf();
if (!test_pid || task->pid != test_pid)
return 0;
ret = bpf_kfunc_multi_st_ops_test_1_impl(&args, NULL);
if (ret != MAP_B_MAGIC)
test_err_b++;
return 0;
}
SEC("syscall")
int syscall_prog_b(void *ctx)
{
struct st_ops_args args = {};
int ret;
ret = bpf_kfunc_multi_st_ops_test_1_impl(&args, NULL);
if (ret != MAP_B_MAGIC)
test_err_b++;
return 0;
}
SEC(".struct_ops.link")
struct bpf_testmod_multi_st_ops st_ops_map_b = {
.test_1 = (void *)test_1_b,
};

17
tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
View File

@ -1134,6 +1134,7 @@ __bpf_kfunc int bpf_kfunc_st_ops_inc10(struct st_ops_args *args)
}
__bpf_kfunc int bpf_kfunc_multi_st_ops_test_1(struct st_ops_args *args, u32 id);
__bpf_kfunc int bpf_kfunc_multi_st_ops_test_1_impl(struct st_ops_args *args, void *aux_prog);
BTF_KFUNCS_START(bpf_testmod_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_testmod_test_mod_kfunc)
@ -1176,6 +1177,7 @@ BTF_ID_FLAGS(func, bpf_kfunc_st_ops_test_epilogue, KF_TRUSTED_ARGS | KF_SLEEPABL
BTF_ID_FLAGS(func, bpf_kfunc_st_ops_test_pro_epilogue, KF_TRUSTED_ARGS | KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_kfunc_st_ops_inc10, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_kfunc_multi_st_ops_test_1, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_kfunc_multi_st_ops_test_1_impl, KF_TRUSTED_ARGS)
BTF_KFUNCS_END(bpf_testmod_check_kfunc_ids)
static int bpf_testmod_ops_init(struct btf *btf)
@ -1637,6 +1639,7 @@ static struct bpf_testmod_multi_st_ops *multi_st_ops_find_nolock(u32 id)
return NULL;
}
/* Call test_1() of the struct_ops map identified by the id */
int bpf_kfunc_multi_st_ops_test_1(struct st_ops_args *args, u32 id)
{
struct bpf_testmod_multi_st_ops *st_ops;
@ -1652,6 +1655,20 @@ int bpf_kfunc_multi_st_ops_test_1(struct st_ops_args *args, u32 id)
return ret;
}
/* Call test_1() of the associated struct_ops map */
int bpf_kfunc_multi_st_ops_test_1_impl(struct st_ops_args *args, void *aux__prog)
{
struct bpf_prog_aux *prog_aux = (struct bpf_prog_aux *)aux__prog;
struct bpf_testmod_multi_st_ops *st_ops;
int ret = -1;
st_ops = (struct bpf_testmod_multi_st_ops *)bpf_prog_get_assoc_struct_ops(prog_aux);
if (st_ops)
ret = st_ops->test_1(args);
return ret;
}
static int multi_st_ops_reg(void *kdata, struct bpf_link *link)
{
struct bpf_testmod_multi_st_ops *st_ops =

1
tools/testing/selftests/bpf/test_kmods/bpf_testmod_kfunc.h
View File

@ -162,5 +162,6 @@ struct task_struct *bpf_kfunc_ret_rcu_test(void) __ksym;
int *bpf_kfunc_ret_rcu_test_nostruct(int rdonly_buf_size) __ksym;
int bpf_kfunc_multi_st_ops_test_1(struct st_ops_args *args, u32 id) __ksym;
int bpf_kfunc_multi_st_ops_test_1_impl(struct st_ops_args *args, void *aux__prog) __ksym;
#endif /* _BPF_TESTMOD_KFUNC_H */