// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
#include "bpf_util.h"

void serial_test_fexit_stress(void)
{
        int bpf_max_tramp_links, err, i;
        int *fd, *fexit_fd, *link_fd;

        bpf_max_tramp_links = get_bpf_max_tramp_links();
        if (!ASSERT_GE(bpf_max_tramp_links, 1, "bpf_max_tramp_links"))
                return;
        fd = calloc(bpf_max_tramp_links * 2, sizeof(*fd));
        if (!ASSERT_OK_PTR(fd, "fd"))
                return;
        fexit_fd = fd;
        link_fd = fd + bpf_max_tramp_links;

        const struct bpf_insn trace_program[] = {
                BPF_MOV64_IMM(BPF_REG_0, 0),
                BPF_EXIT_INSN(),
        };

        LIBBPF_OPTS(bpf_prog_load_opts, trace_opts,
                .expected_attach_type = BPF_TRACE_FEXIT,
        );

        LIBBPF_OPTS(bpf_test_run_opts, topts);

        err = libbpf_find_vmlinux_btf_id("bpf_fentry_test1",
                                         trace_opts.expected_attach_type);
        if (!ASSERT_GT(err, 0, "find_vmlinux_btf_id"))
                goto out;
        trace_opts.attach_btf_id = err;

        for (i = 0; i < bpf_max_tramp_links; i++) {
                fexit_fd[i] = bpf_prog_load(BPF_PROG_TYPE_TRACING, NULL, "GPL",
                                            trace_program,
                                            ARRAY_SIZE(trace_program),
                                            &trace_opts);
                if (!ASSERT_GE(fexit_fd[i], 0, "fexit load"))
                        goto out;
                link_fd[i] = bpf_link_create(fexit_fd[i], 0, BPF_TRACE_FEXIT, NULL);
                if (!ASSERT_GE(link_fd[i], 0, "fexit attach"))
                        goto out;
        }

        err = bpf_prog_test_run_opts(fexit_fd[0], &topts);
        ASSERT_OK(err, "bpf_prog_test_run_opts");

out:
        for (i = 0; i < bpf_max_tramp_links; i++) {
                if (link_fd[i] > 0)
                        close(link_fd[i]);
                if (fexit_fd[i] > 0)
                        close(fexit_fd[i]);
        }
        free(fd);
}