// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

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

struct sample {
        int pid;
        int seq;
        long value;
        char comm[16];
};

struct {
        __uint(type, BPF_MAP_TYPE_RINGBUF);
} ringbuf SEC(".maps");

struct {
        __uint(type, BPF_MAP_TYPE_HASH);
        __uint(max_entries, 1000);
        __type(key, struct sample);
        __type(value, int);
} hash_map SEC(".maps");

/* inputs */
int pid = 0;

/* inner state */
long seq = 0;

SEC("fentry/" SYS_PREFIX "sys_getpgid")
int test_ringbuf_mem_map_key(void *ctx)
{
        int cur_pid = bpf_get_current_pid_tgid() >> 32;
        struct sample *sample;
        int *lookup_val;

        if (cur_pid != pid)
                return 0;

        sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0);
        if (!sample)
                return 0;

        sample->pid = pid;
        bpf_get_current_comm(sample->comm, sizeof(sample->comm));
        sample->seq = ++seq;
        sample->value = 42;

        /* test using 'sample' (PTR_TO_MEM | MEM_ALLOC) as map key arg
         */
        lookup_val = (int *)bpf_map_lookup_elem(&hash_map, sample);
        __sink(lookup_val);

        /*
         * Since bpf_map_lookup_elem above uses 'sample' as key, test using
         * sample field as value below
         */
        bpf_map_update_elem(&hash_map, sample, &sample->seq, BPF_ANY);

        bpf_ringbuf_submit(sample, 0);
        return 0;
}