netdev - Re: [PATCH bpf-next 10/11] selftests/bpf: add split BTF dedup selftests

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Date:   Mon, 2 Nov 2020 22:05:48 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next 10/11] selftests/bpf: add split BTF dedup selftests

On Mon, Nov 2, 2020 at 9:35 PM Song Liu <songliubraving@...com> wrote:
>
>
>
> > On Oct 28, 2020, at 5:59 PM, Andrii Nakryiko <andrii@...nel.org> wrote:
> >
> > Add selftests validating BTF deduplication for split BTF case. Add a helper
> > macro that allows to validate entire BTF with raw BTF dump, not just
> > type-by-type. This saves tons of code and complexity.
> >
> > Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
>
> Acked-by: Song Liu <songliubraving@...com>
>
> with a couple nits:
>
> [...]
>
> >
> > int fprintf_btf_type_raw(FILE *out, const struct btf *btf, __u32 id);
> > const char *btf_type_raw_dump(const struct btf *btf, int type_id);
> > +int btf_validate_raw(struct btf *btf, int nr_types, const char *exp_types[]);
> >
> > +#define VALIDATE_RAW_BTF(btf, raw_types...)                          \
> > +     btf_validate_raw(btf,                                           \
> > +                      sizeof((const char *[]){raw_types})/sizeof(void *),\
> > +                      (const char *[]){raw_types})
> > +
> > +const char *btf_type_c_dump(const struct btf *btf);
> > #endif
> > diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
> > new file mode 100644
> > index 000000000000..097370a41b60
> > --- /dev/null
> > +++ b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
> > @@ -0,0 +1,326 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright (c) 2020 Facebook */
> > +#include <test_progs.h>
> > +#include <bpf/btf.h>
> > +#include "btf_helpers.h"
> > +
> > +
> > +static void test_split_simple() {
> > +     const struct btf_type *t;
> > +     struct btf *btf1, *btf2 = NULL;
> > +     int str_off, err;
> > +
> > +     btf1 = btf__new_empty();
> > +     if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
> > +             return;
> > +
> > +     btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
> > +
> > +     btf__add_int(btf1, "int", 4, BTF_INT_SIGNED);   /* [1] int */
> > +     btf__add_ptr(btf1, 1);                          /* [2] ptr to int */
> > +     btf__add_struct(btf1, "s1", 4);                 /* [3] struct s1 { */
> > +     btf__add_field(btf1, "f1", 1, 0, 0);            /*      int f1; */
> > +                                                     /* } */
> > +
>
> nit: two empty lines.

There is a comment on one of them, so I figured it's not an empty line?

>
> > +     VALIDATE_RAW_BTF(
> > +             btf1,
> > +             "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
> > +             "[2] PTR '(anon)' type_id=1",
> > +             "[3] STRUCT 's1' size=4 vlen=1\n"
> > +             "\t'f1' type_id=1 bits_offset=0");
> > +
>
> [...]
>
> > +
> > +cleanup:
> > +     btf__free(btf2);
> > +     btf__free(btf1);
> > +}
> > +
> > +static void test_split_struct_duped() {
> > +     struct btf *btf1, *btf2 = NULL;
>
> nit: No need to initialize btf2, for all 3 tests.

yep, fixed all three

>
> > +     int err;
> > +
> [...]
>