// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */

#include <argp.h>
#include "bench.h"
#include "bpf_loop_bench.skel.h"

/* BPF triggering benchmarks */
static struct ctx {
        struct bpf_loop_bench *skel;
} ctx;

static struct {
        __u32 nr_loops;
} args = {
        .nr_loops = 10,
};

enum {
        ARG_NR_LOOPS = 4000,
};

static const struct argp_option opts[] = {
        { "nr_loops", ARG_NR_LOOPS, "nr_loops", 0,
                "Set number of loops for the bpf_loop helper"},
        {},
};

static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
        switch (key) {
        case ARG_NR_LOOPS:
                args.nr_loops = strtol(arg, NULL, 10);
                break;
        default:
                return ARGP_ERR_UNKNOWN;
        }

        return 0;
}

/* exported into benchmark runner */
const struct argp bench_bpf_loop_argp = {
        .options = opts,
        .parser = parse_arg,
};

static void validate(void)
{
        if (env.consumer_cnt != 0) {
                fprintf(stderr, "benchmark doesn't support consumer!\n");
                exit(1);
        }
}

static void *producer(void *input)
{
        while (true)
                /* trigger the bpf program */
                syscall(__NR_getpgid);

        return NULL;
}

static void measure(struct bench_res *res)
{
        res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
}

static void setup(void)
{
        struct bpf_link *link;

        setup_libbpf();

        ctx.skel = bpf_loop_bench__open_and_load();
        if (!ctx.skel) {
                fprintf(stderr, "failed to open skeleton\n");
                exit(1);
        }

        link = bpf_program__attach(ctx.skel->progs.benchmark);
        if (!link) {
                fprintf(stderr, "failed to attach program!\n");
                exit(1);
        }

        ctx.skel->bss->nr_loops = args.nr_loops;
}

const struct bench bench_bpf_loop = {
        .name = "bpf-loop",
        .argp = &bench_bpf_loop_argp,
        .validate = validate,
        .setup = setup,
        .producer_thread = producer,
        .measure = measure,
        .report_progress = ops_report_progress,
        .report_final = ops_report_final,
};