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Date: Thu, 3 Aug 2023 21:26:24 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Geliang Tang <geliang.tang@...e.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
Florent Revest <revest@...omium.org>, Brendan Jackman
<jackmanb@...omium.org>, Matthieu Baerts <matthieu.baerts@...sares.net>,
Mat Martineau <martineau@...nel.org>, "David S. Miller"
<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
John Johansen <john.johansen@...onical.com>, Paul Moore
<paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
Stephen Smalley <stephen.smalley.work@...il.com>,
Eric Paris <eparis@...isplace.org>, Mykola Lysenko <mykolal@...com>,
Shuah Khan <shuah@...nel.org>, Simon Horman <horms@...nel.org>,
bpf@...r.kernel.org, netdev@...r.kernel.org, mptcp@...ts.linux.dev,
apparmor@...ts.ubuntu.com, linux-security-module@...r.kernel.org,
selinux@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v9 4/4] selftests/bpf: Add mptcpify test
On 8/3/23 7:24 PM, Geliang Tang wrote:
> Hi Yonghong,
>
> On Thu, Aug 03, 2023 at 06:23:57PM -0700, Yonghong Song wrote:
>>
>>
>> On 8/3/23 6:41 AM, Geliang Tang wrote:
>>> Implement a new test program mptcpify: if the family is AF_INET or
>>> AF_INET6, the type is SOCK_STREAM, and the protocol ID is 0 or
>>> IPPROTO_TCP, set it to IPPROTO_MPTCP. It will be hooked in
>>> update_socket_protocol().
>>>
>>> Extend the MPTCP test base, add a selftest test_mptcpify() for the
>>> mptcpify case. Open and load the mptcpify test prog to mptcpify the
>>> TCP sockets dynamically, then use start_server() and connect_to_fd()
>>> to create a TCP socket, but actually what's created is an MPTCP
>>> socket, which can be verified through the outputs of 'ss' and 'nstat'
>>> commands.
>>>
>>> Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
>>> Signed-off-by: Geliang Tang <geliang.tang@...e.com>
>>> ---
>>> .../testing/selftests/bpf/prog_tests/mptcp.c | 94 +++++++++++++++++++
>>> tools/testing/selftests/bpf/progs/mptcpify.c | 25 +++++
>>> 2 files changed, 119 insertions(+)
>>> create mode 100644 tools/testing/selftests/bpf/progs/mptcpify.c
>>>
>>> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
>>> index 4407bd5c9e9a..caab3aa6a162 100644
>>> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
>>> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
>>> @@ -6,6 +6,7 @@
>>> #include "cgroup_helpers.h"
>>> #include "network_helpers.h"
>>> #include "mptcp_sock.skel.h"
>>> +#include "mptcpify.skel.h"
>>> char NS_TEST[32];
>>> @@ -195,8 +196,101 @@ static void test_base(void)
>>> close(cgroup_fd);
>>> }
>>> +static void send_byte(int fd)
>>> +{
>>> + char b = 0x55;
>>> +
>>> + ASSERT_EQ(write(fd, &b, sizeof(b)), 1, "send single byte");
>>> +}
>>> +
>>> +static int verify_mptcpify(void)
>>> +{
>>> + char cmd[256];
>>> + int err = 0;
>>> +
>>> + snprintf(cmd, sizeof(cmd),
>>> + "ip netns exec %s ss -tOni | grep -q '%s'",
>>> + NS_TEST, "tcp-ulp-mptcp");
>>
>> Could you show what is the expected output from the above command line
>> ip netns exec %s ss -tOni
>> ?
>> This way, users can easily reason about the ss states based on tests.
>
> There're too many items in the output of command 'ip netns exec %s ss -tOni':
>
> '''
> State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
> ESTAB 0 0 127.0.0.1:42225 127.0.0.1:44180 cubic wscale:7,7 rto:201 rtt:0.034/0.017 ato:40 mss:16640 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_received:1 segs_out:1 segs_in:3 data_segs_in:1 send 39152941176bps lastsnd:7 lastrcv:7 lastack:7 pacing_rate 78305882352bps delivered:1 app_limited rcv_space:33280 rcv_ssthresh:33280 minrtt:0.034 snd_wnd:33280 tcp-ulp-mptcp flags:Mec token:0000(id:0)/3a1e0d3c(id:0) seq:c2802f11c5228db6 sfseq:1 ssnoff:49d3c135 maplen:1
> ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic wscale:7,7 rto:201 rtt:0.036/0.02 mss:16640 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_sent:1 bytes_acked:2 segs_out:3 segs_in:2 data_segs_out:1 send 36977777778bps lastsnd:7 lastrcv:7 lastack:7 pacing_rate 72200677960bps delivery_rate 8874666664bps delivered:2 rcv_space:33280 rcv_ssthresh:33280 minrtt:0.015 snd_wnd:33280 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/39429ce(id:0) seq:e3ed00de37c805c sfseq:1 ssnoff:d4e4d561 maplen:0
> '''
>
> We only care about this 'tcp-ulp-mptcp' item.
>
> Show all output will confuse users. So we just pick and test the only
> item we care.
Thanks. Originally I thought at least we should put one line in
the comment which has 'tcp-ulp-mptcp' like
ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic
wscale:7,7 rto:201 rtt:0.036/0.02 mss:16640 pmtu:65535 rcvmss:536
advmss:65483 cwnd:10 bytes_sent:1 bytes_acked:2 segs_out:3 segs_in:2
data_segs_out:1 send 36977777778bps lastsnd:7 lastrcv:7 lastack:7
pacing_rate 72200677960bps delivery_rate 8874666664bps delivered:2
rcv_space:33280 rcv_ssthresh:33280 minrtt:0.015 snd_wnd:33280
tcp-ulp-mptcp flags:Mmec token:0000(id:0)/39429ce(id:0)
seq:e3ed00de37c805c sfseq:1 ssnoff:d4e4d561 maplen:0
or simplified version
ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic
... tcp-ulp-mptcp flags:Mmec ...
But people familiar with 'ss' should be able to dump it and get
the above (maybe without tcp-ulp-mptcp) easily. So I am okay
with no additional comments.
>
>>
>>> + if (!ASSERT_OK(system(cmd), "No tcp-ulp-mptcp found!"))
>>> + err++;
>>> +
>>> + snprintf(cmd, sizeof(cmd),
>>> + "ip netns exec %s nstat -asz %s | awk '%s' | grep -q '%s'",
>>> + NS_TEST, "MPTcpExtMPCapableSYNACKRX",
>>> + "NR==1 {next} {print $2}", "1");
>>
>> The same thing here. Could you show the expected output with
>> ip netns exec %s nstat -asz %s
>> ?
>
> The output of 'ip netns exec %s nstat -asz %s' is:
>
> '''
> #kernel
> MPTcpExtMPCapableSYNACKRX 1 0.0
> '''
>
> The same, we only check if it contains an MPTcpExtMPCapableSYNACKRX, not
> show the output.
>
> -Geliang
>
>>
>>> + if (!ASSERT_OK(system(cmd), "No MPTcpExtMPCapableSYNACKRX found!"))
>>> + err++;
>>> +
>>> + return err;
>>> +}
>>> +
>> [...]
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