// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023. Huawei Technologies Co., Ltd */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>

#include "bpf_experimental.h"

struct bin_data {
        char data[256];
        struct bpf_spin_lock lock;
};

struct map_value {
        struct bin_data __kptr * data;
};

struct {
        __uint(type, BPF_MAP_TYPE_ARRAY);
        __type(key, int);
        __type(value, struct map_value);
        __uint(max_entries, 2048);
} array SEC(".maps");

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

bool nomem_err = false;

static int del_array(unsigned int i, int *from)
{
        struct map_value *value;
        struct bin_data *old;

        value = bpf_map_lookup_elem(&array, from);
        if (!value)
                return 1;

        old = bpf_kptr_xchg(&value->data, NULL);
        if (old)
                bpf_obj_drop(old);

        (*from)++;
        return 0;
}

static int add_array(unsigned int i, int *from)
{
        struct bin_data *old, *new;
        struct map_value *value;

        value = bpf_map_lookup_elem(&array, from);
        if (!value)
                return 1;

        new = bpf_obj_new(typeof(*new));
        if (!new) {
                nomem_err = true;
                return 1;
        }

        old = bpf_kptr_xchg(&value->data, new);
        if (old)
                bpf_obj_drop(old);

        (*from)++;
        return 0;
}

static void del_then_add_array(int from)
{
        int i;

        i = from;
        bpf_loop(512, del_array, &i, 0);

        i = from;
        bpf_loop(512, add_array, &i, 0);
}

SEC("fentry/bpf_fentry_test1")
int BPF_PROG2(test0, int, a)
{
        del_then_add_array(0);
        return 0;
}

SEC("fentry/bpf_fentry_test2")
int BPF_PROG2(test1, int, a, u64, b)
{
        del_then_add_array(512);
        return 0;
}

SEC("fentry/bpf_fentry_test3")
int BPF_PROG2(test2, char, a, int, b, u64, c)
{
        del_then_add_array(1024);
        return 0;
}

SEC("fentry/bpf_fentry_test4")
int BPF_PROG2(test3, void *, a, char, b, int, c, u64, d)
{
        del_then_add_array(1536);
        return 0;
}