// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "bpf_test_utils.h"

int classifier_0(struct __sk_buff *skb);

struct {
        __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
        __uint(max_entries, 1);
        __uint(key_size, sizeof(__u32));
        __array(values, void (void));
} jmp_table0 SEC(".maps") = {
        .values = {
                [0] = (void *) &classifier_0,
        },
};

struct {
        __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
        __uint(max_entries, 1);
        __uint(key_size, sizeof(__u32));
        __array(values, void (void));
} jmp_table1 SEC(".maps") = {
        .values = {
                [0] = (void *) &classifier_0,
        },
};

int count = 0;

static __noinline
int subprog_tail(struct __sk_buff *skb, void *jmp_table)
{
        bpf_tail_call_static(skb, jmp_table, 0);
        return 0;
}

__auxiliary
SEC("tc")
int classifier_0(struct __sk_buff *skb)
{
        count++;
        subprog_tail(skb, &jmp_table0);
        subprog_tail(skb, &jmp_table1);
        return count;
}

__success
__retval(33)
SEC("tc")
int tailcall_bpf2bpf_hierarchy_3(struct __sk_buff *skb)
{
        int ret = 0;

        clobber_regs_stack();

        bpf_tail_call_static(skb, &jmp_table0, 0);

        __sink(ret);
        return ret;
}

char __license[] SEC("license") = "GPL";