netdev - Re: [PATCH bpf-next 2/2] selftests/bpf: Adding test for arg dereference in extension trace

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Message-ID: <87y2lga86q.fsf@toke.dk>
Date:   Fri, 11 Sep 2020 13:01:33 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>
Subject: Re: [PATCH bpf-next 2/2] selftests/bpf: Adding test for arg
 dereference in extension trace

Andrii Nakryiko <andrii.nakryiko@...il.com> writes:

> On Wed, Sep 9, 2020 at 8:38 AM Jiri Olsa <jolsa@...nel.org> wrote:
>>
>> Adding test that setup following program:
>>
>>   SEC("classifier/test_pkt_md_access")
>>   int test_pkt_md_access(struct __sk_buff *skb)
>>
>> with its extension:
>>
>>   SEC("freplace/test_pkt_md_access")
>>   int test_pkt_md_access_new(struct __sk_buff *skb)
>>
>> and tracing that extension with:
>>
>>   SEC("fentry/test_pkt_md_access_new")
>>   int BPF_PROG(fentry, struct sk_buff *skb)
>>
>> The test verifies that the tracing program can
>> dereference skb argument properly.
>>
>> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Just FYI, I included this same patch in my freplace series. I didn't
change anything in the version I just resent, but I'll work with Jiri
and get an updated version of this into the next version based on your
comments here... :)

-Toke