From: Yafang Shao <laoar.shao@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
yonghong.song@linux.dev, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, tj@kernel.org
Cc: bpf@vger.kernel.org, Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH v4 bpf-next 2/6] selftests/bpf: Fix issues in setup_classid_environment()
Date: Sat, 11 Nov 2023 09:00:30 +0000 [thread overview]
Message-ID: <20231111090034.4248-3-laoar.shao@gmail.com> (raw)
In-Reply-To: <20231111090034.4248-1-laoar.shao@gmail.com>
If the net_cls subsystem is already mounted, attempting to mount it again
in setup_classid_environment() will result in a failure with the error code
EBUSY. Despite this, tmpfs will have been successfully mounted at
/sys/fs/cgroup/net_cls. Consequently, the /sys/fs/cgroup/net_cls directory
will be empty, causing subsequent setup operations to fail.
Here's an error log excerpt illustrating the issue when net_cls has already
been mounted at /sys/fs/cgroup/net_cls prior to running
setup_classid_environment():
- Before that change
$ tools/testing/selftests/bpf/test_progs --name=cgroup_v1v2
test_cgroup_v1v2:PASS:server_fd 0 nsec
test_cgroup_v1v2:PASS:client_fd 0 nsec
test_cgroup_v1v2:PASS:cgroup_fd 0 nsec
test_cgroup_v1v2:PASS:server_fd 0 nsec
run_test:PASS:skel_open 0 nsec
run_test:PASS:prog_attach 0 nsec
test_cgroup_v1v2:PASS:cgroup-v2-only 0 nsec
(cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup Procs: /sys/fs/cgroup/net_cls/cgroup.procs
(cgroup_helpers.c:540: errno: No such file or directory) Opening cgroup classid: /sys/fs/cgroup/net_cls/cgroup-test-work-dir/net_cls.classid
run_test:PASS:skel_open 0 nsec
run_test:PASS:prog_attach 0 nsec
(cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup Procs: /sys/fs/cgroup/net_cls/cgroup-test-work-dir/cgroup.procs
run_test:FAIL:join_classid unexpected error: 1 (errno 2)
test_cgroup_v1v2:FAIL:cgroup-v1v2 unexpected error: -1 (errno 2)
(cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup Procs: /sys/fs/cgroup/net_cls/cgroup.procs
#44 cgroup_v1v2:FAIL
Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
- After that change
$ tools/testing/selftests/bpf/test_progs --name=cgroup_v1v2
#44 cgroup_v1v2:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
tools/testing/selftests/bpf/cgroup_helpers.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c b/tools/testing/selftests/bpf/cgroup_helpers.c
index 5b1da2a..10b5f42 100644
--- a/tools/testing/selftests/bpf/cgroup_helpers.c
+++ b/tools/testing/selftests/bpf/cgroup_helpers.c
@@ -523,10 +523,20 @@ int setup_classid_environment(void)
return 1;
}
- if (mount("net_cls", NETCLS_MOUNT_PATH, "cgroup", 0, "net_cls") &&
- errno != EBUSY) {
- log_err("mount cgroup net_cls");
- return 1;
+ if (mount("net_cls", NETCLS_MOUNT_PATH, "cgroup", 0, "net_cls")) {
+ if (errno != EBUSY) {
+ log_err("mount cgroup net_cls");
+ return 1;
+ }
+
+ if (rmdir(NETCLS_MOUNT_PATH)) {
+ log_err("rmdir cgroup net_cls");
+ return 1;
+ }
+ if (umount(CGROUP_MOUNT_DFLT)) {
+ log_err("umount cgroup base");
+ return 1;
+ }
}
cleanup_classid_environment();
--
1.8.3.1
next prev parent reply other threads:[~2023-11-11 9:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-11 9:00 [PATCH v4 bpf-next 0/6] bpf: Add support for cgroup1, BPF part Yafang Shao
2023-11-11 9:00 ` [PATCH v4 bpf-next 1/6] bpf: Add a new kfunc for cgroup1 hierarchy Yafang Shao
2023-11-11 9:00 ` Yafang Shao [this message]
2023-11-11 9:00 ` [PATCH v4 bpf-next 3/6] selftests/bpf: Add parallel support for classid Yafang Shao
2023-11-11 9:00 ` [PATCH v4 bpf-next 4/6] selftests/bpf: Add a new cgroup helper get_classid_cgroup_id() Yafang Shao
2023-11-11 9:00 ` [PATCH v4 bpf-next 5/6] selftests/bpf: Add a new cgroup helper get_cgroup_hierarchy_id() Yafang Shao
2023-11-11 9:00 ` [PATCH v4 bpf-next 6/6] selftests/bpf: Add selftests for cgroup1 hierarchy Yafang Shao
2023-11-14 17:06 ` Alexei Starovoitov
2023-11-15 1:47 ` Yafang Shao
2023-11-14 17:10 ` [PATCH v4 bpf-next 0/6] bpf: Add support for cgroup1, BPF part patchwork-bot+netdevbpf
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