diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_global_func_args.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_global_func_args.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_global_func_args.c b/tools/testing/selftests/bpf/progs/test_global_func_args.c new file mode 100644 index 000000000000..cae309538a9e --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_global_func_args.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/bpf.h> + +#include <bpf/bpf_helpers.h> + +struct S { + int v; +}; + +static volatile struct S global_variable; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 7); + __type(key, __u32); + __type(value, int); +} values SEC(".maps"); + +static void save_value(__u32 index, int value) +{ + bpf_map_update_elem(&values, &index, &value, 0); +} + +__noinline int foo(__u32 index, struct S *s) +{ + if (s) { + save_value(index, s->v); + return ++s->v; + } + + save_value(index, 0); + + return 1; +} + +__noinline int bar(__u32 index, volatile struct S *s) +{ + if (s) { + save_value(index, s->v); + return ++s->v; + } + + save_value(index, 0); + + return 1; +} + +__noinline int baz(struct S **s) +{ + if (s) + *s = 0; + + return 0; +} + +SEC("cgroup_skb/ingress") +int test_cls(struct __sk_buff *skb) +{ + __u32 index = 0; + + { + const int v = foo(index++, 0); + + save_value(index++, v); + } + + { + struct S s = { .v = 100 }; + + foo(index++, &s); + save_value(index++, s.v); + } + + { + global_variable.v = 42; + bar(index++, &global_variable); + save_value(index++, global_variable.v); + } + + { + struct S v, *p = &v; + + baz(&p); + save_value(index++, !p); + } + + return 0; +} + +char _license[] SEC("license") = "GPL"; |