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bpftool: Output message if no helpers found in feature probing 

Currently in libbpf, we have hardcoded program types that are not
supported for helper function probing (e.g. tracing, ext, lsm).
Due to this (and other legitimate failures), bpftool feature probe returns
empty for those program type helper functions.

Instead of implying to the user that there are no helper functions
available for a program type, we output a message to the user explaining
that helper function probing failed for that program type.

Signed-off-by: Milan Landaverde <milan@mdaverde.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220504161356.3497972-3-milan@mdaverde.com
This commit is contained in:
Milan Landaverde 2022-05-04 12:13:32 -04:00 committed by Andrii Nakryiko
parent 6d9f63b9df
commit b06a92a18d
1 changed files with 15 additions and 3 deletions
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18
tools/bpf/bpftool/feature.c
View File

@ -690,7 +690,7 @@ probe_helper_ifindex(enum bpf_func_id id, enum bpf_prog_type prog_type,
return res;
}
static void
static bool
probe_helper_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
const char *define_prefix, unsigned int id,
const char *ptype_name, __u32 ifindex)
@ -723,6 +723,8 @@ probe_helper_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
if (res)
printf("\n\t- %s", helper_name[id]);
}
return res;
}
static void
@ -732,6 +734,7 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
const char *ptype_name = prog_type_name[prog_type];
char feat_name[128];
unsigned int id;
bool probe_res = false;
if (ifindex)
/* Only test helpers for offload-able program types */
@ -764,7 +767,7 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
continue;
/* fallthrough */
default:
probe_helper_for_progtype(prog_type, supported_type,
probe_res |= probe_helper_for_progtype(prog_type, supported_type,
define_prefix, id, ptype_name,
ifindex);
}
@ -772,8 +775,17 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
if (json_output)
jsonw_end_array(json_wtr);
else if (!define_prefix)
else if (!define_prefix) {
printf("\n");
if (!probe_res) {
if (!supported_type)
printf("\tProgram type not supported\n");
else
printf("\tCould not determine which helpers are available\n");
}
}
}
static void