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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "bpf_iter.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 3);
__type(key, __u32);
__type(value, __u64);
} arraymap1 SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 10);
__type(key, __u64);
__type(value, __u32);
} hashmap1 SEC(".maps");
__u32 key_sum = 0;
__u64 val_sum = 0;
SEC("iter/bpf_map_elem")
int dump_bpf_array_map(struct bpf_iter__bpf_map_elem *ctx)
{
__u32 *hmap_val, *key = ctx->key;
__u64 *val = ctx->value;
if (key == (void *)0 || val == (void *)0)
return 0;
bpf_seq_write(ctx->meta->seq, key, sizeof(__u32));
bpf_seq_write(ctx->meta->seq, val, sizeof(__u64));
key_sum += *key;
val_sum += *val;
/* workaround - It's necessary to do this convoluted (val, key)
* write into hashmap1, instead of simply doing
* bpf_map_update_elem(&hashmap1, val, key, BPF_ANY);
* because key has MEM_RDONLY flag and bpf_map_update elem expects
* types without this flag
*/
bpf_map_update_elem(&hashmap1, val, val, BPF_ANY);
hmap_val = bpf_map_lookup_elem(&hashmap1, val);
if (hmap_val)
*hmap_val = *key;
*val = *key;
return 0;
}
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