// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <vmlinux.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;
}