netdev - Re: [PATCH v2 bpf-next 0/5] btf_dedup algorithm and test fixes

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Date:   Fri, 1 Mar 2019 01:42:33 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Andrii Nakryiko <andriin@...com>, andrii.nakryiko@...il.com,
        kernel-team@...com, ast@...com, acme@...nel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, songliubraving@...com
Subject: Re: [PATCH v2 bpf-next 0/5] btf_dedup algorithm and test fixes

On 03/01/2019 12:31 AM, Andrii Nakryiko wrote:
> This patchset fixes a bug in btf_dedup() algorithm, which under specific hash
> collision causes infinite loop. It also exposes ability to tune BTF
> deduplication table size, with double purpose of allowing applications to
> adjust size according to the size of BTF data, as well as allowing a simple way
> to force hash collisions by setting table size to 1.
> 
> - Patch #1 fixes bug in btf_dedup testing code that's checking strings
> - Patch #2 fixes pointer arg formatting in btf.h
> - Patch #3 adds option to specify custom dedup table size
> - Patch #4 fixes aforementioned bug in btf_dedup
> - Patch #5 adds test that validates the fix
> 
> v1->v2:
> - remove "Fixes" from formatting change patch
> - extract roundup_pow2_max func for dedup table size
> - btf_equal_struct -> btf_shallow_equal_struct
> - explain in comment why we can't rely on just btf_dedup_is_equiv
> 
> Andrii Nakryiko (5):
>   selftests/bpf: fix btf_dedup testing code
>   libbpf: fix formatting for btf_ext__get_raw_data
>   btf: allow to customize dedup hash table size
>   btf: fix bug with resolving STRUCT/UNION into corresponding FWD
>   selftests/bpf: add btf_dedup test of FWD/STRUCT resolution
> 
>  tools/lib/bpf/btf.c                    | 73 +++++++++++++++++++-------
>  tools/lib/bpf/btf.h                    |  3 +-
>  tools/testing/selftests/bpf/.gitignore |  1 +
>  tools/testing/selftests/bpf/test_btf.c | 49 ++++++++++++++++-
>  4 files changed, 103 insertions(+), 23 deletions(-)
> 

Applied, thanks!