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authorMilan Landaverde <milan@mdaverde.com>2022-05-04 19:13:32 +0300
committerAndrii Nakryiko <andrii@kernel.org>2022-05-10 03:16:05 +0300
commitb06a92a18d4651c983c60d83935a76b2d47d85e0 (patch)
treefcfdc05cea7c63cb457c771f560047bfa8371197 /tools/bpf
parent6d9f63b9df5ed7ffe10ac70025f408d28b3dd260 (diff)
downloadlinux-b06a92a18d4651c983c60d83935a76b2d47d85e0.tar.xz
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
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/feature.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index c532c8855c24..d12f46051aac 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -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