linux-kernel - Re: [PATCH bpf-next v6 2/2] selftests: bpf: test BPF_PROG

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Date:   Fri, 21 Jan 2022 06:19:19 +0000
From:   "zhudi (E)" <zhudi2@...wei.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        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>,
        Jakub Sitnicki <jakub@...udflare.com>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        "Luzhihao (luzhihao, Euler)" <luzhihao@...wei.com>,
        "Chenxiang (EulerOS)" <rose.chen@...wei.com>
Subject: Re: [PATCH bpf-next v6 2/2] selftests: bpf: test BPF_PROG_QUERY for
 progs attached to sockmap

> > Add test for querying progs attached to sockmap. we use an existing
> > libbpf query interface to query prog cnt before and after progs
> > attaching to sockmap and check whether the queried prog id is right.
> >
> > Signed-off-by: Di Zhu <zhudi2@...wei.com>
> > Acked-by: Yonghong Song <yhs@...com>
> > ---
> >  .../selftests/bpf/prog_tests/sockmap_basic.c  | 66 +++++++++++++++++++
> >  .../bpf/progs/test_sockmap_progs_query.c      | 24 +++++++
> >  2 files changed, 90 insertions(+)
> >  create mode 100644
> tools/testing/selftests/bpf/progs/test_sockmap_progs_query.c
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> > index 85db0f4cdd95..1ab57cdc4ae4 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> > @@ -8,6 +8,7 @@
> >  #include "test_sockmap_update.skel.h"
> >  #include "test_sockmap_invalid_update.skel.h"
> >  #include "test_sockmap_skb_verdict_attach.skel.h"
> > +#include "test_sockmap_progs_query.skel.h"
> >  #include "bpf_iter_sockmap.skel.h"
> >
> >  #define TCP_REPAIR             19      /* TCP sock is under repair
> right now */
> > @@ -315,6 +316,63 @@ static void test_sockmap_skb_verdict_attach(enum
> bpf_attach_type first,
> >         test_sockmap_skb_verdict_attach__destroy(skel);
> >  }
> >
> > +static __u32 query_prog_id(int prog_fd)
> > +{
> > +       struct bpf_prog_info info = {};
> > +       __u32 info_len = sizeof(info);
> > +       int err;
> > +
> > +       err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
> > +       if (!ASSERT_OK(err, "bpf_obj_get_info_by_fd") ||
> > +           !ASSERT_EQ(info_len, sizeof(info), "bpf_obj_get_info_by_fd"))
> > +               return 0;
> > +
> > +       return info.id;
> > +}
> > +
> > +static void test_sockmap_progs_query(enum bpf_attach_type attach_type)
> > +{
> > +       struct test_sockmap_progs_query *skel;
> > +       int err, map_fd, verdict_fd, duration = 0;
> 
> The 'duration' is unused.
> You should have seen a warning while compiling the selftests?
> 
> Anyway. I've fixed it while applying.

Thank you. I'll be more careful next time.