// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
#include <test_progs.h>
#include "dummy_st_ops_success.skel.h"
#include "dummy_st_ops_fail.skel.h"
#include "trace_dummy_st_ops.skel.h"

/* Need to keep consistent with definition in include/linux/bpf.h */
struct bpf_dummy_ops_state {
        int val;
};

static void test_dummy_st_ops_attach(void)
{
        struct dummy_st_ops_success *skel;
        struct bpf_link *link;

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        link = bpf_map__attach_struct_ops(skel->maps.dummy_1);
        ASSERT_EQ(libbpf_get_error(link), -EOPNOTSUPP, "dummy_st_ops_attach");

        dummy_st_ops_success__destroy(skel);
}

static void test_dummy_init_ret_value(void)
{
        __u64 args[1] = {0};
        LIBBPF_OPTS(bpf_test_run_opts, attr,
                .ctx_in = args,
                .ctx_size_in = sizeof(args),
        );
        struct dummy_st_ops_success *skel;
        int fd, err;

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        fd = bpf_program__fd(skel->progs.test_1);
        err = bpf_prog_test_run_opts(fd, &attr);
        ASSERT_OK(err, "test_run");
        ASSERT_EQ(attr.retval, 0xf2f3f4f5, "test_ret");

        dummy_st_ops_success__destroy(skel);
}

static void test_dummy_init_ptr_arg(void)
{
        int exp_retval = 0xbeef;
        struct bpf_dummy_ops_state in_state = {
                .val = exp_retval,
        };
        __u64 args[1] = {(unsigned long)&in_state};
        LIBBPF_OPTS(bpf_test_run_opts, attr,
                .ctx_in = args,
                .ctx_size_in = sizeof(args),
        );
        struct trace_dummy_st_ops *trace_skel;
        struct dummy_st_ops_success *skel;
        int fd, err;

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        fd = bpf_program__fd(skel->progs.test_1);

        trace_skel = trace_dummy_st_ops__open();
        if (!ASSERT_OK_PTR(trace_skel, "trace_dummy_st_ops__open"))
                goto done;

        err = bpf_program__set_attach_target(trace_skel->progs.fentry_test_1,
                                             fd, "test_1");
        if (!ASSERT_OK(err, "set_attach_target(fentry_test_1)"))
                goto done;

        err = trace_dummy_st_ops__load(trace_skel);
        if (!ASSERT_OK(err, "load(trace_skel)"))
                goto done;

        err = trace_dummy_st_ops__attach(trace_skel);
        if (!ASSERT_OK(err, "attach(trace_skel)"))
                goto done;

        err = bpf_prog_test_run_opts(fd, &attr);
        ASSERT_OK(err, "test_run");
        ASSERT_EQ(in_state.val, 0x5a, "test_ptr_ret");
        ASSERT_EQ(attr.retval, exp_retval, "test_ret");
        ASSERT_EQ(trace_skel->bss->val, exp_retval, "fentry_val");

done:
        dummy_st_ops_success__destroy(skel);
        trace_dummy_st_ops__destroy(trace_skel);
}

static void test_dummy_multiple_args(void)
{
        struct bpf_dummy_ops_state st = { 7 };
        __u64 args[5] = {(__u64)&st, -100, 0x8a5f, 'c', 0x1234567887654321ULL};
        LIBBPF_OPTS(bpf_test_run_opts, attr,
                .ctx_in = args,
                .ctx_size_in = sizeof(args),
        );
        struct dummy_st_ops_success *skel;
        int fd, err;
        size_t i;
        char name[8];

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        fd = bpf_program__fd(skel->progs.test_2);
        err = bpf_prog_test_run_opts(fd, &attr);
        ASSERT_OK(err, "test_run");
        args[0] = 7;
        for (i = 0; i < ARRAY_SIZE(args); i++) {
                snprintf(name, sizeof(name), "arg %zu", i);
                ASSERT_EQ(skel->bss->test_2_args[i], args[i], name);
        }

        dummy_st_ops_success__destroy(skel);
}

static void test_dummy_sleepable(void)
{
        struct bpf_dummy_ops_state st;
        __u64 args[1] = {(__u64)&st};
        LIBBPF_OPTS(bpf_test_run_opts, attr,
                .ctx_in = args,
                .ctx_size_in = sizeof(args),
        );
        struct dummy_st_ops_success *skel;
        int fd, err;

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        fd = bpf_program__fd(skel->progs.test_sleepable);
        err = bpf_prog_test_run_opts(fd, &attr);
        ASSERT_OK(err, "test_run");

        dummy_st_ops_success__destroy(skel);
}

/* dummy_st_ops.test_sleepable() parameter is not marked as nullable,
 * thus bpf_prog_test_run_opts() below should be rejected as it tries
 * to pass NULL for this parameter.
 */
static void test_dummy_sleepable_reject_null(void)
{
        __u64 args[1] = {0};
        LIBBPF_OPTS(bpf_test_run_opts, attr,
                .ctx_in = args,
                .ctx_size_in = sizeof(args),
        );
        struct dummy_st_ops_success *skel;
        int fd, err;

        skel = dummy_st_ops_success__open_and_load();
        if (!ASSERT_OK_PTR(skel, "dummy_st_ops_load"))
                return;

        fd = bpf_program__fd(skel->progs.test_sleepable);
        err = bpf_prog_test_run_opts(fd, &attr);
        ASSERT_EQ(err, -EINVAL, "test_run");

        dummy_st_ops_success__destroy(skel);
}

void test_dummy_st_ops(void)
{
        if (test__start_subtest("dummy_st_ops_attach"))
                test_dummy_st_ops_attach();
        if (test__start_subtest("dummy_init_ret_value"))
                test_dummy_init_ret_value();
        if (test__start_subtest("dummy_init_ptr_arg"))
                test_dummy_init_ptr_arg();
        if (test__start_subtest("dummy_multiple_args"))
                test_dummy_multiple_args();
        if (test__start_subtest("dummy_sleepable"))
                test_dummy_sleepable();
        if (test__start_subtest("dummy_sleepable_reject_null"))
                test_dummy_sleepable_reject_null();

        RUN_TESTS(dummy_st_ops_fail);
}