[PATCH bpf-next 0/3] libbpf: btf typed data dumping fixes (__int128 usage, error propagation)

From: Alan Maguire
Date: Mon Jul 19 2021 - 18:20:49 EST

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@xxxxxxxxxx/T/#mc2cb023acfd6c3cd0b661e385787b76bb757430d

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

tools/lib/bpf/btf_dump.c | 67 +++++++++++++----------
tools/testing/selftests/bpf/prog_tests/btf_dump.c | 17 ++++++
2 files changed, 55 insertions(+), 29 deletions(-)