// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include "test_subprogs.skel.h"
#include "test_subprogs_unused.skel.h"

struct toggler_ctx {
        int fd;
        bool stop;
};

static void *toggle_jit_harden(void *arg)
{
        struct toggler_ctx *ctx = arg;
        char two = '2';
        char zero = '0';

        while (!ctx->stop) {
                lseek(ctx->fd, SEEK_SET, 0);
                write(ctx->fd, &two, sizeof(two));
                lseek(ctx->fd, SEEK_SET, 0);
                write(ctx->fd, &zero, sizeof(zero));
        }

        return NULL;
}

static void test_subprogs_with_jit_harden_toggling(void)
{
        struct toggler_ctx ctx;
        pthread_t toggler;
        int err;
        unsigned int i, loop = 10;

        ctx.fd = open("/proc/sys/net/core/bpf_jit_harden", O_RDWR);
        if (!ASSERT_GE(ctx.fd, 0, "open bpf_jit_harden"))
                return;

        ctx.stop = false;
        err = pthread_create(&toggler, NULL, toggle_jit_harden, &ctx);
        if (!ASSERT_OK(err, "new toggler"))
                goto out;

        /* Make toggler thread to run */
        usleep(1);

        for (i = 0; i < loop; i++) {
                struct test_subprogs *skel = test_subprogs__open_and_load();

                if (!ASSERT_OK_PTR(skel, "skel open"))
                        break;
                test_subprogs__destroy(skel);
        }

        ctx.stop = true;
        pthread_join(toggler, NULL);
out:
        close(ctx.fd);
}

static void test_subprogs_alone(void)
{
        struct test_subprogs *skel;
        struct test_subprogs_unused *skel2;
        int err;

        skel = test_subprogs__open_and_load();
        if (!ASSERT_OK_PTR(skel, "skel_open"))
                return;

        err = test_subprogs__attach(skel);
        if (!ASSERT_OK(err, "skel attach"))
                goto cleanup;

        usleep(1);

        ASSERT_EQ(skel->bss->res1, 12, "res1");
        ASSERT_EQ(skel->bss->res2, 17, "res2");
        ASSERT_EQ(skel->bss->res3, 19, "res3");
        ASSERT_EQ(skel->bss->res4, 36, "res4");

        skel2 = test_subprogs_unused__open_and_load();
        ASSERT_OK_PTR(skel2, "unused_progs_skel");
        test_subprogs_unused__destroy(skel2);

cleanup:
        test_subprogs__destroy(skel);
}

void test_subprogs(void)
{
        if (test__start_subtest("subprogs_alone"))
                test_subprogs_alone();
        if (test__start_subtest("subprogs_and_jit_harden"))
                test_subprogs_with_jit_harden_toggling();
}