1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include "bpf_iter.h"
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_tracing.h>
6 
7 char _license[] SEC("license") = "GPL";
8 
9 struct {
10 	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
11 	__uint(max_entries, 3);
12 	__type(key, __u32);
13 	__type(value, __u32);
14 } arraymap1 SEC(".maps");
15 
16 /* will set before prog run */
17 volatile const __u32 num_cpus = 0;
18 
19 __u32 key_sum = 0, val_sum = 0;
20 
21 SEC("iter/bpf_map_elem")
dump_bpf_percpu_array_map(struct bpf_iter__bpf_map_elem * ctx)22 int dump_bpf_percpu_array_map(struct bpf_iter__bpf_map_elem *ctx)
23 {
24 	__u32 *key = ctx->key;
25 	void *pptr = ctx->value;
26 	__u32 step;
27 	int i;
28 
29 	if (key == (void *)0 || pptr == (void *)0)
30 		return 0;
31 
32 	key_sum += *key;
33 
34 	step = 8;
35 	for (i = 0; i < num_cpus; i++) {
36 		val_sum += *(__u32 *)pptr;
37 		pptr += step;
38 	}
39 	return 0;
40 }
41