diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/tailcall1.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/tailcall1.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/tailcall1.c b/tools/testing/selftests/bpf/progs/tailcall1.c new file mode 100644 index 000000000000..63531e1a9fa4 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/tailcall1.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/bpf.h> + +#include "bpf_helpers.h" + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, 3); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u32)); +} jmp_table SEC(".maps"); + +#define TAIL_FUNC(x) \ + SEC("classifier/" #x) \ + int bpf_func_##x(struct __sk_buff *skb) \ + { \ + return x; \ + } +TAIL_FUNC(0) +TAIL_FUNC(1) +TAIL_FUNC(2) + +SEC("classifier") +int entry(struct __sk_buff *skb) +{ + /* Multiple locations to make sure we patch + * all of them. + */ + bpf_tail_call(skb, &jmp_table, 0); + bpf_tail_call(skb, &jmp_table, 0); + bpf_tail_call(skb, &jmp_table, 0); + bpf_tail_call(skb, &jmp_table, 0); + + bpf_tail_call(skb, &jmp_table, 1); + bpf_tail_call(skb, &jmp_table, 1); + bpf_tail_call(skb, &jmp_table, 1); + bpf_tail_call(skb, &jmp_table, 1); + + bpf_tail_call(skb, &jmp_table, 2); + bpf_tail_call(skb, &jmp_table, 2); + bpf_tail_call(skb, &jmp_table, 2); + bpf_tail_call(skb, &jmp_table, 2); + + return 3; +} + +char __license[] SEC("license") = "GPL"; +int _version SEC("version") = 1; |