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-rw-r--r--tools/testing/selftests/bpf/progs/tailcall_bpf2bpf3.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf3.c b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf3.c
new file mode 100644
index 000000000..7fab39a3b
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf3.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_legacy.h"
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+ __uint(max_entries, 2);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(__u32));
+} jmp_table SEC(".maps");
+
+__noinline
+int subprog_tail2(struct __sk_buff *skb)
+{
+ volatile char arr[64] = {};
+
+ if (load_word(skb, 0) || load_half(skb, 0))
+ bpf_tail_call_static(skb, &jmp_table, 10);
+ else
+ bpf_tail_call_static(skb, &jmp_table, 1);
+
+ return skb->len;
+}
+
+static __noinline
+int subprog_tail(struct __sk_buff *skb)
+{
+ volatile char arr[64] = {};
+
+ bpf_tail_call_static(skb, &jmp_table, 0);
+
+ return skb->len * 2;
+}
+
+SEC("tc")
+int classifier_0(struct __sk_buff *skb)
+{
+ volatile char arr[128] = {};
+
+ return subprog_tail2(skb);
+}
+
+SEC("tc")
+int classifier_1(struct __sk_buff *skb)
+{
+ volatile char arr[128] = {};
+
+ return skb->len * 3;
+}
+
+SEC("tc")
+int entry(struct __sk_buff *skb)
+{
+ volatile char arr[128] = {};
+
+ return subprog_tail(skb);
+}
+
+char __license[] SEC("license") = "GPL";