78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/unistd.h>
|
|
#include <linux/bpf.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <bpf/bpf.h>
|
|
#include "bpf_util.h"
|
|
|
|
#define MAX_INDEX 64
|
|
#define MAX_STARS 38
|
|
|
|
static void stars(char *str, long val, long max, int width)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
|
|
str[i] = '*';
|
|
if (val > max)
|
|
str[i - 1] = '+';
|
|
str[i] = '\0';
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
const char *map_filename = "/sys/fs/bpf/tc/globals/lwt_len_hist_map";
|
|
uint64_t values[nr_cpus], sum, max_value = 0, data[MAX_INDEX] = {};
|
|
uint64_t key = 0, next_key, max_key = 0;
|
|
char starstr[MAX_STARS];
|
|
int i, map_fd;
|
|
|
|
map_fd = bpf_obj_get(map_filename);
|
|
if (map_fd < 0) {
|
|
fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
|
|
map_filename, strerror(errno), errno);
|
|
return -1;
|
|
}
|
|
|
|
while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
|
|
if (next_key >= MAX_INDEX) {
|
|
fprintf(stderr, "Key %lu out of bounds\n", next_key);
|
|
continue;
|
|
}
|
|
|
|
bpf_map_lookup_elem(map_fd, &next_key, values);
|
|
|
|
sum = 0;
|
|
for (i = 0; i < nr_cpus; i++)
|
|
sum += values[i];
|
|
|
|
data[next_key] = sum;
|
|
if (sum && next_key > max_key)
|
|
max_key = next_key;
|
|
|
|
if (sum > max_value)
|
|
max_value = sum;
|
|
|
|
key = next_key;
|
|
}
|
|
|
|
for (i = 1; i <= max_key + 1; i++) {
|
|
stars(starstr, data[i - 1], max_value, MAX_STARS);
|
|
printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
|
|
(1l << i) >> 1, (1l << i) - 1, data[i - 1],
|
|
MAX_STARS, starstr);
|
|
}
|
|
|
|
close(map_fd);
|
|
|
|
return 0;
|
|
}
|