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-rw-r--r--tools/testing/selftests/bpf/progs/tailcall6.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/tailcall6.c b/tools/testing/selftests/bpf/progs/tailcall6.c
new file mode 100644
index 000000000..d77b8abd6
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/tailcall6.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+
+#include <bpf/bpf_helpers.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+ __uint(max_entries, 1);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(__u32));
+} jmp_table SEC(".maps");
+
+int count, which;
+
+SEC("tc")
+int classifier_0(struct __sk_buff *skb)
+{
+ count++;
+ if (__builtin_constant_p(which))
+ __bpf_unreachable();
+ bpf_tail_call(skb, &jmp_table, which);
+ return 1;
+}
+
+SEC("tc")
+int entry(struct __sk_buff *skb)
+{
+ if (__builtin_constant_p(which))
+ __bpf_unreachable();
+ bpf_tail_call(skb, &jmp_table, which);
+ return 0;
+}
+
+char __license[] SEC("license") = "GPL";