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selftests/bpf: test struct_ops with epoll

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Verify whether a user space program is informed through epoll with EPOLLHUP
when a struct_ops object is detached.

The BPF code in selftests/bpf/progs/struct_ops_module.c has become
complex. Therefore, struct_ops_detach.c has been added to segregate the BPF
code for detachment tests from the BPF code for other tests based on the
recommendation of Andrii Nakryiko.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240530065946.979330-6-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee 2024-05-29 23:59:43 -07:00 committed by Martin KaFai Lau
parent 67c3e8353f
commit 1a4b858b6a
2 changed files with 67 additions and 0 deletions
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57
tools/testing/selftests/bpf/prog_tests/test_struct_ops_module.c
View File

@ -3,9 +3,12 @@
#include <test_progs.h>
#include <time.h>
#include <sys/epoll.h>
#include "struct_ops_module.skel.h"
#include "struct_ops_nulled_out_cb.skel.h"
#include "struct_ops_forgotten_cb.skel.h"
#include "struct_ops_detach.skel.h"
static void check_map_info(struct bpf_map_info *info)
{
@ -242,6 +245,58 @@ cleanup:
struct_ops_forgotten_cb__destroy(skel);
}
/* Detach a link from a user space program */
static void test_detach_link(void)
{
struct epoll_event ev, events[2];
struct struct_ops_detach *skel;
struct bpf_link *link = NULL;
int fd, epollfd = -1, nfds;
int err;
skel = struct_ops_detach__open_and_load();
if (!ASSERT_OK_PTR(skel, "struct_ops_detach__open_and_load"))
return;
link = bpf_map__attach_struct_ops(skel->maps.testmod_do_detach);
if (!ASSERT_OK_PTR(link, "attach_struct_ops"))
goto cleanup;
fd = bpf_link__fd(link);
if (!ASSERT_GE(fd, 0, "link_fd"))
goto cleanup;
epollfd = epoll_create1(0);
if (!ASSERT_GE(epollfd, 0, "epoll_create1"))
goto cleanup;
ev.events = EPOLLHUP;
ev.data.fd = fd;
err = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev);
if (!ASSERT_OK(err, "epoll_ctl"))
goto cleanup;
err = bpf_link__detach(link);
if (!ASSERT_OK(err, "detach_link"))
goto cleanup;
/* Wait for EPOLLHUP */
nfds = epoll_wait(epollfd, events, 2, 500);
if (!ASSERT_EQ(nfds, 1, "epoll_wait"))
goto cleanup;
if (!ASSERT_EQ(events[0].data.fd, fd, "epoll_wait_fd"))
goto cleanup;
if (!ASSERT_TRUE(events[0].events & EPOLLHUP, "events[0].events"))
goto cleanup;
cleanup:
if (epollfd >= 0)
close(epollfd);
bpf_link__destroy(link);
struct_ops_detach__destroy(skel);
}
void serial_test_struct_ops_module(void)
{
if (test__start_subtest("struct_ops_load"))
@ -254,5 +309,7 @@ void serial_test_struct_ops_module(void)
test_struct_ops_nulled_out_cb();
if (test__start_subtest("struct_ops_forgotten_cb"))
test_struct_ops_forgotten_cb();
if (test__start_subtest("test_detach_link"))
test_detach_link();
}

10
tools/testing/selftests/bpf/progs/struct_ops_detach.c Normal file
View File

@ -0,0 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "../bpf_testmod/bpf_testmod.h"
char _license[] SEC("license") = "GPL";
SEC(".struct_ops.link")
struct bpf_testmod_ops testmod_do_detach;