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/* Copyright (c) 2016 PLUMgrid
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <linux/bpf.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bpf_load.h"
#include "bpf_util.h"
#include "libbpf.h"
static int ifindex;
static void int_exit(int sig)
{
set_link_xdp_fd(ifindex, -1);
exit(0);
}
/* simple per-protocol drop counter
*/
static void poll_stats(int interval)
{
unsigned int nr_cpus = bpf_num_possible_cpus();
const unsigned int nr_keys = 256;
__u64 values[nr_cpus], prev[nr_keys][nr_cpus];
__u32 key;
int i;
memset(prev, 0, sizeof(prev));
while (1) {
sleep(interval);
for (key = 0; key < nr_keys; key++) {
__u64 sum = 0;
assert(bpf_lookup_elem(map_fd[0], &key, values) == 0);
for (i = 0; i < nr_cpus; i++)
sum += (values[i] - prev[key][i]);
if (sum)
printf("proto %u: %10llu pkt/s\n",
key, sum / interval);
memcpy(prev[key], values, sizeof(values));
}
}
}
int main(int ac, char **argv)
{
char filename[256];
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
if (ac != 2) {
printf("usage: %s IFINDEX\n", argv[0]);
return 1;
}
ifindex = strtoul(argv[1], NULL, 0);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
return 1;
}
if (!prog_fd[0]) {
printf("load_bpf_file: %s\n", strerror(errno));
return 1;
}
signal(SIGINT, int_exit);
if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) {
printf("link set xdp fd failed\n");
return 1;
}
poll_stats(2);
return 0;
}
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