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bpftool: Adjust for error codes from libbpf probes

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Originally [1], libbpf's (now deprecated) probe functions returned a bool
to acknowledge support but the new APIs return an int with a possible
negative error code to reflect probe failure. This change decides for
bpftool to declare maps and helpers are not available on probe failures.

[1]: https://lore.kernel.org/bpf/20220202225916.3313522-3-andrii@kernel.org/

Signed-off-by: Milan Landaverde <milan@mdaverde.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220504161356.3497972-2-milan@mdaverde.com
This commit is contained in:
Milan Landaverde 2022-05-04 12:13:31 -04:00 committed by Andrii Nakryiko
parent 7b3a063824
commit 6d9f63b9df
1 changed files with 2 additions and 2 deletions
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4
tools/bpf/bpftool/feature.c
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@ -638,7 +638,7 @@ probe_map_type(enum bpf_map_type map_type, const char *define_prefix,
res = probe_map_type_ifindex(map_type, ifindex);
} else {
res = libbpf_probe_bpf_map_type(map_type, NULL);
res = libbpf_probe_bpf_map_type(map_type, NULL) > 0;
}
/* Probe result depends on the success of map creation, no additional
@ -701,7 +701,7 @@ probe_helper_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
if (ifindex)
res = probe_helper_ifindex(id, prog_type, ifindex);
else
res = libbpf_probe_bpf_helper(prog_type, id, NULL);
res = libbpf_probe_bpf_helper(prog_type, id, NULL) > 0;
#ifdef USE_LIBCAP
/* Probe may succeed even if program load fails, for
* unprivileged users check that we did not fail because of