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Message-ID: <18cb274a-a214-42c0-bcec-cbda34703893@linux.dev>
Date: Fri, 18 Oct 2024 16:57:20 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Alexis Lothoré (eBPF Foundation)
<alexis.lothore@...tlin.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>,
Shuah Khan <shuah@...nel.org>, "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>,
ebpf@...uxfoundation.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Lorenz Bauer <lmb@...udflare.com>, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 2/6] selftests/bpf: add missing ns cleanups in
btf_skc_cls_ingress
On 10/16/24 11:35 AM, Alexis Lothoré (eBPF Foundation) wrote:
> btf_skc_cls_ingress.c currently runs two subtests, and create a
> dedicated network namespace for each, but never cleans up the created
> namespace once the test has ended.
>
> Add missing namespace cleanup after each namespace to avoid accumulating
> namespaces for each new subtest. While at it, switch namespace
> management to netns_{new,free}
>
> Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@...tlin.com>
> ---
> .../selftests/bpf/prog_tests/btf_skc_cls_ingress.c | 31 ++++++++++++++--------
> 1 file changed, 20 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c
> index 5d8d7736edc095b647ca3fbc12cac0440b60140e..8d1fa8806cdda088d264b44104f7c80726b025e2 100644
> --- a/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c
> +++ b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c
> @@ -17,32 +17,34 @@
> #include "test_progs.h"
> #include "test_btf_skc_cls_ingress.skel.h"
>
> +#define TEST_NS "skc_cls_ingress"
> +
> static struct test_btf_skc_cls_ingress *skel;
> static struct sockaddr_in6 srv_sa6;
> static __u32 duration;
>
> -static int prepare_netns(void)
> +static struct netns_obj *prepare_netns(void)
> {
> LIBBPF_OPTS(bpf_tc_hook, qdisc_lo, .attach_point = BPF_TC_INGRESS);
> LIBBPF_OPTS(bpf_tc_opts, tc_attach,
> .prog_fd = bpf_program__fd(skel->progs.cls_ingress));
> + struct netns_obj *ns = NULL;
>
> - if (CHECK(unshare(CLONE_NEWNET), "create netns",
> - "unshare(CLONE_NEWNET): %s (%d)",
> - strerror(errno), errno))
> - return -1;
> + ns = netns_new(TEST_NS, true);
> + if (!ASSERT_OK_PTR(ns, "create and join netns"))
> + return ns;
>
> if (CHECK(system("ip link set dev lo up"),
> "ip link set dev lo up", "failed\n"))
nit. netns_new() takes care of "lo up" also, so the above can be removed.
test_progs.c has restore_netns() after each test, so the netns was not cleaned
up. The second unshare should have freed the earlier netns also.
Using netns_new() removed the boiler plate codes. It is nice to see this change
here regardless.
> - return -1;
> + goto free_ns;
>
> qdisc_lo.ifindex = if_nametoindex("lo");
> if (!ASSERT_OK(bpf_tc_hook_create(&qdisc_lo), "qdisc add dev lo clsact"))
> - return -1;
> + goto free_ns;
>
> if (!ASSERT_OK(bpf_tc_attach(&qdisc_lo, &tc_attach),
> "filter add dev lo ingress"))
> - return -1;
> + goto free_ns;
>
> /* Ensure 20 bytes options (i.e. in total 40 bytes tcp header) for the
> * bpf_tcp_gen_syncookie() helper.
> @@ -50,9 +52,13 @@ static int prepare_netns(void)
> if (write_sysctl("/proc/sys/net/ipv4/tcp_window_scaling", "1") ||
> write_sysctl("/proc/sys/net/ipv4/tcp_timestamps", "1") ||
> write_sysctl("/proc/sys/net/ipv4/tcp_sack", "1"))
> - return -1;
> + goto free_ns;
> +
> + return ns;
>
> - return 0;
> +free_ns:
> + netns_free(ns);
> + return NULL;
> }
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