Teach veristat how to deal with freplace BPF programs. As they can't be
directly loaded by veristat without custom user-space part that sets correct
target program FD, veristat always fails freplace programs. This patch set
teaches veristat to guess target program type that will be inherited by
freplace program itself, and subtitute it for BPF_PROG_TYPE_EXT (freplace) one
for the purposes of BPF verification.
Patch #1 fixes bug in libbpf preventing overriding freplace with specific
program type.
Patch #2 adds convenient -d flag to request veristat to emit libbpf debug
logs. It help debugging why a specific BPF program fails to load, if the
problem is not due to BPF verification itself.
Andrii Nakryiko (3):
libbpf: disassociate section handler on explicit
bpf_program__set_type() call
veristat: add -d debug mode option to see debug libbpf log
veristat: guess and substitue underlying program type for freplace
(EXT) progs
tools/lib/bpf/libbpf.c | 1 +
tools/testing/selftests/bpf/veristat.c | 125 ++++++++++++++++++++++++-
2 files changed, 121 insertions(+), 5 deletions(-)
--
2.34.1
