Merge branch 'Provide bpf_for() and bpf_for_each() by libbpf'

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Andrii Nakryiko says:

====================

This patch set moves bpf_for(), bpf_for_each(), and bpf_repeat() macros from
selftests-internal bpf_misc.h header to libbpf-provided bpf_helpers.h header.
To do this in a way to allow users to feature-detect and guard such
bpf_for()/bpf_for_each() uses on old kernels we also extend libbpf to improve
unresolved kfunc calls handling and reporting. This lets us mark
bpf_iter_num_{new,next,destroy}() declarations as __weak, and thus not fail
program loading outright if such kfuncs are missing on the host kernel.

Patches #1 and #2 do some simple clean ups and logging improvements. Patch #3
adds kfunc call poisoning and log fixup logic and is the hear of this patch
set, effectively. Patch #4 adds selftest for this logic. Patches #4 and #5
move bpf_for()/bpf_for_each()/bpf_repeat() into bpf_helpers.h header and mark
kfuncs as __weak to allow users to feature-detect and guard their uses.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Alexei Starovoitov 2023-04-18 12:45:11 -07:00

parent 49859de997 94dccba795

commit 276dcdd1a8

5 changed files with 232 additions and 122 deletions

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103

tools/lib/bpf/bpf_helpers.h

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107

tools/lib/bpf/libbpf.c

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31

tools/testing/selftests/bpf/prog_tests/log_fixup.c

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103

tools/testing/selftests/bpf/progs/bpf_misc.h

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10

tools/testing/selftests/bpf/progs/test_log_fixup.c

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