// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */

#include <test_progs.h>

struct callback_head {
        struct callback_head *next;
        void (*func)(struct callback_head *head);
};

/* ___shuffled flavor is just an illusion for BPF code, it doesn't really
 * exist and user-space needs to provide data in the memory layout that
 * matches callback_head. We just defined ___shuffled flavor to make it easier
 * to work with the skeleton
 */
struct callback_head___shuffled {
        struct callback_head___shuffled *next;
        void (*func)(struct callback_head *head);
};

#include "test_core_read_macros.skel.h"

void test_core_read_macros(void)
{
        int duration = 0, err;
        struct test_core_read_macros* skel;
        struct test_core_read_macros__bss *bss;
        struct callback_head u_probe_in;
        struct callback_head___shuffled u_core_in;

        skel = test_core_read_macros__open_and_load();
        if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
                return;
        bss = skel->bss;
        bss->my_pid = getpid();

        /* next pointers have to be set from the kernel side */
        bss->k_probe_in.func = (void *)(long)0x1234;
        bss->k_core_in.func = (void *)(long)0xabcd;

        u_probe_in.next = &u_probe_in;
        u_probe_in.func = (void *)(long)0x5678;
        bss->u_probe_in = &u_probe_in;

        u_core_in.next = &u_core_in;
        u_core_in.func = (void *)(long)0xdbca;
        bss->u_core_in = &u_core_in;

        err = test_core_read_macros__attach(skel);
        if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
                goto cleanup;

        /* trigger tracepoint */
        usleep(1);

        ASSERT_EQ(bss->k_probe_out, 0x1234, "k_probe_out");
        ASSERT_EQ(bss->k_core_out, 0xabcd, "k_core_out");

        ASSERT_EQ(bss->u_probe_out, 0x5678, "u_probe_out");
        ASSERT_EQ(bss->u_core_out, 0xdbca, "u_core_out");

cleanup:
        test_core_read_macros__destroy(skel);
}