// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright 2020 Google LLC.
 */

#include <test_progs.h>
#include "modify_return.skel.h"

#define LOWER(x) ((x) & 0xffff)
#define UPPER(x) ((x) >> 16)


static void run_test(__u32 input_retval, __u16 want_side_effect, __s16 want_ret)
{
        struct modify_return *skel = NULL;
        int err, prog_fd;
        __u16 side_effect;
        __s16 ret;
        LIBBPF_OPTS(bpf_test_run_opts, topts);

        skel = modify_return__open_and_load();
        if (!ASSERT_OK_PTR(skel, "skel_load"))
                goto cleanup;

        err = modify_return__attach(skel);
        if (!ASSERT_OK(err, "modify_return__attach failed"))
                goto cleanup;

        skel->bss->input_retval = input_retval;
        prog_fd = bpf_program__fd(skel->progs.fmod_ret_test);
        err = bpf_prog_test_run_opts(prog_fd, &topts);
        ASSERT_OK(err, "test_run");

        side_effect = UPPER(topts.retval);
        ret = LOWER(topts.retval);

        ASSERT_EQ(ret, want_ret, "test_run ret");
        ASSERT_EQ(side_effect, want_side_effect, "modify_return side_effect");
        ASSERT_EQ(skel->bss->fentry_result, 1, "modify_return fentry_result");
        ASSERT_EQ(skel->bss->fexit_result, 1, "modify_return fexit_result");
        ASSERT_EQ(skel->bss->fmod_ret_result, 1, "modify_return fmod_ret_result");

        ASSERT_EQ(skel->bss->fentry_result2, 1, "modify_return fentry_result2");
        ASSERT_EQ(skel->bss->fexit_result2, 1, "modify_return fexit_result2");
        ASSERT_EQ(skel->bss->fmod_ret_result2, 1, "modify_return fmod_ret_result2");

cleanup:
        modify_return__destroy(skel);
}

/* TODO: conflict with get_func_ip_test */
void serial_test_modify_return(void)
{
        run_test(0 /* input_retval */,
                 2 /* want_side_effect */,
                 33 /* want_ret */);
        run_test(-EINVAL /* input_retval */,
                 0 /* want_side_effect */,
                 -EINVAL * 2 /* want_ret */);
}