cregit-Linux how code gets into the kernel

Release 4.14 samples/bpf/xdp1_user.c

Directory: samples/bpf
/* 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 <linux/if_link.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>

#include "bpf_load.h"
#include "bpf_util.h"
#include "libbpf.h"


static int ifindex;

static __u32 xdp_flags;


static void int_exit(int sig) { set_link_xdp_fd(ifindex, -1, xdp_flags); exit(0); }

Contributors

PersonTokensPropCommitsCommitProp
Brenden Blanco2291.67%133.33%
David Ahern14.17%133.33%
Jesper Dangaard Brouer14.17%133.33%
Total24100.00%3100.00%

/* 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_map_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)); } } }

Contributors

PersonTokensPropCommitsCommitProp
Brenden Blanco16198.17%133.33%
Daniel Borkmann21.22%133.33%
Joe Stringer10.61%133.33%
Total164100.00%3100.00%


static void usage(const char *prog) { fprintf(stderr, "usage: %s [OPTS] IFINDEX\n\n" "OPTS:\n" " -S use skb-mode\n" " -N enforce native mode\n", prog); }

Contributors

PersonTokensPropCommitsCommitProp
David Ahern2295.65%150.00%
Daniel Borkmann14.35%150.00%
Total23100.00%2100.00%


int main(int argc, char **argv) { const char *optstr = "SN"; char filename[256]; int opt; while ((opt = getopt(argc, argv, optstr)) != -1) { switch (opt) { case 'S': xdp_flags |= XDP_FLAGS_SKB_MODE; break; case 'N': xdp_flags |= XDP_FLAGS_DRV_MODE; break; default: usage(basename(argv[0])); return 1; } } if (optind == argc) { usage(basename(argv[0])); return 1; } ifindex = strtoul(argv[optind], NULL, 0); snprintf(filename, sizeof(filename), "%s_kern.o", argv[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); signal(SIGTERM, int_exit); if (set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) { printf("link set xdp fd failed\n"); return 1; } poll_stats(2); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Brenden Blanco13659.39%120.00%
David Ahern7532.75%120.00%
Daniel Borkmann93.93%120.00%
Andy Gospodarek73.06%120.00%
Jesper Dangaard Brouer20.87%120.00%
Total229100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Brenden Blanco35572.60%114.29%
David Ahern10621.68%114.29%
Daniel Borkmann153.07%228.57%
Andy Gospodarek71.43%114.29%
Jesper Dangaard Brouer51.02%114.29%
Joe Stringer10.20%114.29%
Total489100.00%7100.00%
Directory: samples/bpf
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