netdev - Re: [PATCH bpf-next] bpf: Add BPF-helper for accessing CLOCK

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Message-ID: <87k07o1pfw.fsf@kurt>
Date:   Thu, 04 Aug 2022 08:40:51 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jesper Dangaard Brouer <jbrouer@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Joanne Koong <joannelkoong@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Geliang Tang <geliang.tang@...e.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next] bpf: Add BPF-helper for accessing CLOCK_TAI

On Wed Aug 03 2022, Andrii Nakryiko wrote:
>> +void test_tai(void)
>> +{
>> +       struct __sk_buff skb = {
>> +               .tstamp = 0,
>> +               .hwtstamp = 0,
>> +       };
>> +       LIBBPF_OPTS(bpf_test_run_opts, topts,
>> +               .data_in = &pkt_v4,
>> +               .data_size_in = sizeof(pkt_v4),
>> +               .ctx_in = &skb,
>> +               .ctx_size_in = sizeof(skb),
>> +               .ctx_out = &skb,
>> +               .ctx_size_out = sizeof(skb),
>> +       );
>> +       struct timespec now_tai;
>> +       struct bpf_object *obj;
>> +       int ret, prog_fd;
>> +
>> +       ret = bpf_prog_test_load("./test_tai.o",
>> +                                BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
>
> it would be best to rely on BPF skeleton, please see other tests
> including *.skel.h, thanks
>

Ah, nice. Adjusted the test case accordingly. Will post v2 after the
merge window. Thanks!

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