// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */

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

struct bpf_iter_testmod_seq {
        u64 :64;
        u64 :64;
};

extern int bpf_iter_testmod_seq_new(struct bpf_iter_testmod_seq *it, s64 value, int cnt) __ksym;
extern s64 *bpf_iter_testmod_seq_next(struct bpf_iter_testmod_seq *it) __ksym;
extern s64 bpf_iter_testmod_seq_value(int blah, struct bpf_iter_testmod_seq *it) __ksym;
extern void bpf_iter_testmod_seq_destroy(struct bpf_iter_testmod_seq *it) __ksym;

const volatile __s64 exp_empty = 0 + 1;
__s64 res_empty;

SEC("raw_tp/sys_enter")
__success __log_level(2)
__msg("fp-16=iter_testmod_seq(ref_id=1,state=active,depth=0)")
__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
__msg("call bpf_iter_testmod_seq_destroy")
int testmod_seq_empty(const void *ctx)
{
        __s64 sum = 0, *i;

        bpf_for_each(testmod_seq, i, 1000, 0) sum += *i;
        res_empty = 1 + sum;

        return 0;
}

const volatile __s64 exp_full = 1000000;
__s64 res_full;

SEC("raw_tp/sys_enter")
__success __log_level(2)
__msg("fp-16=iter_testmod_seq(ref_id=1,state=active,depth=0)")
__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
__msg("call bpf_iter_testmod_seq_destroy")
int testmod_seq_full(const void *ctx)
{
        __s64 sum = 0, *i;

        bpf_for_each(testmod_seq, i, 1000, 1000) sum += *i;
        res_full = sum;

        return 0;
}

const volatile __s64 exp_truncated = 10 * 1000000;
__s64 res_truncated;

static volatile int zero = 0;

SEC("raw_tp/sys_enter")
__success __log_level(2)
__msg("fp-16=iter_testmod_seq(ref_id=1,state=active,depth=0)")
__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
__msg("call bpf_iter_testmod_seq_destroy")
int testmod_seq_truncated(const void *ctx)
{
        __s64 sum = 0, *i;
        int cnt = zero;

        bpf_for_each(testmod_seq, i, 10, 2000000) {
                sum += *i;
                cnt++;
                if (cnt >= 1000000)
                        break;
        }
        res_truncated = sum;

        return 0;
}

SEC("?raw_tp")
__failure
__msg("expected an initialized iter_testmod_seq as arg #1")
int testmod_seq_getter_before_bad(const void *ctx)
{
        struct bpf_iter_testmod_seq it;

        return bpf_iter_testmod_seq_value(0, &it);
}

SEC("?raw_tp")
__failure
__msg("expected an initialized iter_testmod_seq as arg #1")
int testmod_seq_getter_after_bad(const void *ctx)
{
        struct bpf_iter_testmod_seq it;
        s64 sum = 0, *v;

        bpf_iter_testmod_seq_new(&it, 100, 100);

        while ((v = bpf_iter_testmod_seq_next(&it))) {
                sum += *v;
        }

        bpf_iter_testmod_seq_destroy(&it);

        return sum + bpf_iter_testmod_seq_value(0, &it);
}

SEC("?socket")
__success __retval(1000000)
int testmod_seq_getter_good(const void *ctx)
{
        struct bpf_iter_testmod_seq it;
        s64 sum = 0, *v;

        bpf_iter_testmod_seq_new(&it, 100, 100);

        while ((v = bpf_iter_testmod_seq_next(&it))) {
                sum += *v;
        }

        sum *= bpf_iter_testmod_seq_value(0, &it);

        bpf_iter_testmod_seq_destroy(&it);

        return sum;
}

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