/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
 */
#include <bpf/bpf.h>
#include <sched.h>
#include <scx/common.h>
#include <sys/wait.h>
#include <unistd.h>
#include "prog_run.bpf.skel.h"
#include "scx_test.h"

static enum scx_test_status setup(void **ctx)
{
        struct prog_run *skel;

        skel = prog_run__open();
        SCX_FAIL_IF(!skel, "Failed to open");
        SCX_ENUM_INIT(skel);
        SCX_FAIL_IF(prog_run__load(skel), "Failed to load skel");

        *ctx = skel;

        return SCX_TEST_PASS;
}

static enum scx_test_status run(void *ctx)
{
        struct prog_run *skel = ctx;
        struct bpf_link *link;
        int prog_fd, err = 0;

        prog_fd = bpf_program__fd(skel->progs.prog_run_syscall);
        if (prog_fd < 0) {
                SCX_ERR("Failed to get BPF_PROG_RUN prog");
                return SCX_TEST_FAIL;
        }

        LIBBPF_OPTS(bpf_test_run_opts, topts);

        link = bpf_map__attach_struct_ops(skel->maps.prog_run_ops);
        if (!link) {
                SCX_ERR("Failed to attach scheduler");
                close(prog_fd);
                return SCX_TEST_FAIL;
        }

        err = bpf_prog_test_run_opts(prog_fd, &topts);
        SCX_EQ(err, 0);

        /* Assumes uei.kind is written last */
        while (skel->data->uei.kind == EXIT_KIND(SCX_EXIT_NONE))
                sched_yield();

        SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_UNREG_BPF));
        SCX_EQ(skel->data->uei.exit_code, 0xdeadbeef);
        close(prog_fd);
        bpf_link__destroy(link);

        return SCX_TEST_PASS;
}

static void cleanup(void *ctx)
{
        struct prog_run *skel = ctx;

        prog_run__destroy(skel);
}

struct scx_test prog_run = {
        .name = "prog_run",
        .description = "Verify we can call into a scheduler with BPF_PROG_RUN, and invoke kfuncs",
        .setup = setup,
        .run = run,
        .cleanup = cleanup,
};
REGISTER_SCX_TEST(&prog_run)