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authorMichal Rostecki <mrostecki@opensuse.org>2020-02-26 17:59:36 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2020-02-26 18:34:34 +0100
commit368cb0e7cdb5e67ad8c0cd52f1d71341c42a7e4b (patch)
tree7031a16848e12350bf8fdc2384ceacdbbc6901a4 /tools/bpf
parent6b52ca44e8af2c508ffbcd03261cf849a740756a (diff)
downloadlinux-368cb0e7cdb5e67ad8c0cd52f1d71341c42a7e4b.tar.bz2
bpftool: Make probes which emit dmesg warnings optional
Probes related to bpf_probe_write_user and bpf_trace_printk helpers emit dmesg warnings which might be confusing for people running bpftool on production environments. This change filters them out by default and introduces the new positional argument "full" which enables all available probes. Signed-off-by: Michal Rostecki <mrostecki@opensuse.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20200226165941.6379-3-mrostecki@opensuse.org
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/feature.c70
1 files changed, 49 insertions, 21 deletions
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index 345e4a2b4f53..88718ee6a438 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -514,13 +514,38 @@ probe_map_type(enum bpf_map_type map_type, const char *define_prefix,
}
static void
+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)
+{
+ bool res;
+
+ if (!supported_type)
+ res = false;
+ else
+ res = bpf_probe_helper(id, prog_type, ifindex);
+
+ if (json_output) {
+ if (res)
+ jsonw_string(json_wtr, helper_name[id]);
+ } else if (define_prefix) {
+ printf("#define %sBPF__PROG_TYPE_%s__HELPER_%s %s\n",
+ define_prefix, ptype_name, helper_name[id],
+ res ? "1" : "0");
+ } else {
+ if (res)
+ printf("\n\t- %s", helper_name[id]);
+ }
+}
+
+static void
probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
- const char *define_prefix, __u32 ifindex)
+ const char *define_prefix, bool full_mode,
+ __u32 ifindex)
{
const char *ptype_name = prog_type_name[prog_type];
char feat_name[128];
unsigned int id;
- bool res;
if (ifindex)
/* Only test helpers for offload-able program types */
@@ -542,21 +567,19 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
}
for (id = 1; id < ARRAY_SIZE(helper_name); id++) {
- if (!supported_type)
- res = false;
- else
- res = bpf_probe_helper(id, prog_type, ifindex);
-
- if (json_output) {
- if (res)
- jsonw_string(json_wtr, helper_name[id]);
- } else if (define_prefix) {
- printf("#define %sBPF__PROG_TYPE_%s__HELPER_%s %s\n",
- define_prefix, ptype_name, helper_name[id],
- res ? "1" : "0");
- } else {
- if (res)
- printf("\n\t- %s", helper_name[id]);
+ /* Skip helper functions which emit dmesg messages when not in
+ * the full mode.
+ */
+ switch (id) {
+ case BPF_FUNC_trace_printk:
+ case BPF_FUNC_probe_write_user:
+ if (!full_mode)
+ continue;
+ /* fallthrough */
+ default:
+ probe_helper_for_progtype(prog_type, supported_type,
+ define_prefix, id, ptype_name,
+ ifindex);
}
}
@@ -655,7 +678,8 @@ static void section_map_types(const char *define_prefix, __u32 ifindex)
}
static void
-section_helpers(bool *supported_types, const char *define_prefix, __u32 ifindex)
+section_helpers(bool *supported_types, const char *define_prefix,
+ bool full_mode, __u32 ifindex)
{
unsigned int i;
@@ -681,7 +705,7 @@ section_helpers(bool *supported_types, const char *define_prefix, __u32 ifindex)
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_helpers_for_progtype(i, supported_types[i],
- define_prefix, ifindex);
+ define_prefix, full_mode, ifindex);
print_end_section();
}
@@ -701,6 +725,7 @@ static int do_probe(int argc, char **argv)
enum probe_component target = COMPONENT_UNSPEC;
const char *define_prefix = NULL;
bool supported_types[128] = {};
+ bool full_mode = false;
__u32 ifindex = 0;
char *ifname;
@@ -740,6 +765,9 @@ static int do_probe(int argc, char **argv)
strerror(errno));
return -1;
}
+ } else if (is_prefix(*argv, "full")) {
+ full_mode = true;
+ NEXT_ARG();
} else if (is_prefix(*argv, "macros") && !define_prefix) {
define_prefix = "";
NEXT_ARG();
@@ -775,7 +803,7 @@ static int do_probe(int argc, char **argv)
goto exit_close_json;
section_program_types(supported_types, define_prefix, ifindex);
section_map_types(define_prefix, ifindex);
- section_helpers(supported_types, define_prefix, ifindex);
+ section_helpers(supported_types, define_prefix, full_mode, ifindex);
section_misc(define_prefix, ifindex);
exit_close_json:
@@ -794,7 +822,7 @@ static int do_help(int argc, char **argv)
}
fprintf(stderr,
- "Usage: %s %s probe [COMPONENT] [macros [prefix PREFIX]]\n"
+ "Usage: %s %s probe [COMPONENT] [full] [macros [prefix PREFIX]]\n"
" %s %s help\n"
"\n"
" COMPONENT := { kernel | dev NAME }\n"