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// 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;
}
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