linux/tools/testing/selftests/bpf/progs/test_btf_newkv.c

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018 Facebook */
#include <linux/bpf.h>
#include "bpf_helpers.h"

int _version SEC("version") = 1;

struct ipv_counts {
	unsigned int v4;
	unsigned int v6;
};

/* just to validate we can handle maps in multiple sections */
struct bpf_map_def SEC("maps") btf_map_legacy = {
	.type = BPF_MAP_TYPE_ARRAY,
	.key_size = sizeof(int),
	.value_size = sizeof(long long),
	.max_entries = 4,
};

BPF_ANNOTATE_KV_PAIR(btf_map_legacy, int, struct ipv_counts);

struct {
	int *key;
	struct ipv_counts *value;
	unsigned int type;
	unsigned int max_entries;
} btf_map SEC(".maps") = {
	.type = BPF_MAP_TYPE_ARRAY,
	.max_entries = 4,
};

struct dummy_tracepoint_args {
	unsigned long long pad;
	struct sock *sock;
};

__attribute__((noinline))
static int test_long_fname_2(struct dummy_tracepoint_args *arg)
{
	struct ipv_counts *counts;
	int key = 0;

	if (!arg->sock)
		return 0;

	counts = bpf_map_lookup_elem(&btf_map, &key);
	if (!counts)
		return 0;

	counts->v6++;

	/* just verify we can reference both maps */
	counts = bpf_map_lookup_elem(&btf_map_legacy, &key);
	if (!counts)
		return 0;

	return 0;
}

__attribute__((noinline))
static int test_long_fname_1(struct dummy_tracepoint_args *arg)
{
	return test_long_fname_2(arg);
}

SEC("dummy_tracepoint")
int _dummy_tracepoint(struct dummy_tracepoint_args *arg)
{
	return test_long_fname_1(arg);
}

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