netdev - [PATCH v2 bpf-next 0/3] libbpf: btf typed data dumping fixes (_

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Message-Id: <1626770993-11073-1-git-send-email-alan.maguire@oracle.com>
Date:   Tue, 20 Jul 2021 09:49:50 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, morbo@...gle.com,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH v2 bpf-next 0/3] libbpf: btf typed data dumping fixes (__int128 usage, error propagation)

This series aims to resolve further issues with the BTF typed data
dumping interfaces in libbpf.

Compilation failures with use of __int128 on 32-bit platforms were
reported [1].  As a result, the use of __int128 in libbpf typed data
dumping is replaced with __u64 usage for bitfield manipulations.
In the case of 128-bit integer values, they are simply split into
two 64-bit hex values for display (patch 1).

Tests are added for __int128 display in patch 2, using conditional
compilation to avoid problems with a lack of __int128 support.

Patch 3 resolves an issue Andrii noted about error propagation
when handling enum data display.

More followup work is required to ensure multi-dimensional char array
display works correctly.

[1] https://lore.kernel.org/bpf/1626362126-27775-1-git-send-email-alan.maguire@oracle.com/T/#mc2cb023acfd6c3cd0b661e385787b76bb757430d

Changes since v1:

 - added error handling for bitfield size > 64 bits by changing function
   signature for bitfield retrieval to return an int error value and to set
   bitfield value via a __u64 * argument (Andrii)

Alan Maguire (3):
  libbpf: avoid use of __int128 in typed dump display
  selftests/bpf: add __int128-specific tests for typed data dump
  libbpf: propagate errors when retrieving enum value for typed data
    display

 tools/lib/bpf/btf_dump.c                          | 103 ++++++++++++++--------
 tools/testing/selftests/bpf/prog_tests/btf_dump.c |  17 ++++
 2 files changed, 85 insertions(+), 35 deletions(-)

-- 
1.8.3.1