tools: bpftool: add simple perf event output reader
Users of BPF sooner or later discover perf_event_output() helpers
and BPF_MAP_TYPE_PERF_EVENT_ARRAY. Dumping this array type is
not possible, however, we can add simple reading of perf events.
Create a new event_pipe subcommand for maps, this sub command
will only work with BPF_MAP_TYPE_PERF_EVENT_ARRAY maps.
Parts of the code from samples/bpf/trace_output_user.c.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
index 9c62077..32f9e39 100644
--- a/tools/bpf/bpftool/common.c
+++ b/tools/bpf/bpftool/common.c
@@ -331,6 +331,16 @@ char *get_fdinfo(int fd, const char *key)
return NULL;
}
+void print_data_json(uint8_t *data, size_t len)
+{
+ unsigned int i;
+
+ jsonw_start_array(json_wtr);
+ for (i = 0; i < len; i++)
+ jsonw_printf(json_wtr, "%d", data[i]);
+ jsonw_end_array(json_wtr);
+}
+
void print_hex_data_json(uint8_t *data, size_t len)
{
unsigned int i;
@@ -421,6 +431,15 @@ void delete_pinned_obj_table(struct pinned_obj_table *tab)
}
}
+unsigned int get_page_size(void)
+{
+ static int result;
+
+ if (!result)
+ result = getpagesize();
+ return result;
+}
+
unsigned int get_possible_cpus(void)
{
static unsigned int result;