| /* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| */ |
| #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 <stdbool.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <libgen.h> |
| #include <sys/resource.h> |
| |
| #include "bpf_load.h" |
| #include "bpf_util.h" |
| #include <bpf/bpf.h> |
| |
| static int ifindex_in; |
| static int ifindex_out; |
| static bool ifindex_out_xdp_dummy_attached = true; |
| |
| static __u32 xdp_flags; |
| |
| static void int_exit(int sig) |
| { |
| bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags); |
| if (ifindex_out_xdp_dummy_attached) |
| bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags); |
| exit(0); |
| } |
| |
| static void poll_stats(int interval, int ifindex) |
| { |
| unsigned int nr_cpus = bpf_num_possible_cpus(); |
| __u64 values[nr_cpus], prev[nr_cpus]; |
| |
| memset(prev, 0, sizeof(prev)); |
| |
| while (1) { |
| __u64 sum = 0; |
| __u32 key = 0; |
| int i; |
| |
| sleep(interval); |
| assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0); |
| for (i = 0; i < nr_cpus; i++) |
| sum += (values[i] - prev[i]); |
| if (sum) |
| printf("ifindex %i: %10llu pkt/s\n", |
| ifindex, sum / interval); |
| memcpy(prev, values, sizeof(values)); |
| } |
| } |
| |
| static void usage(const char *prog) |
| { |
| fprintf(stderr, |
| "usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n" |
| "OPTS:\n" |
| " -S use skb-mode\n" |
| " -N enforce native mode\n", |
| prog); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; |
| const char *optstr = "SN"; |
| char filename[256]; |
| int ret, opt, key = 0; |
| |
| 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) { |
| printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]); |
| return 1; |
| } |
| |
| if (setrlimit(RLIMIT_MEMLOCK, &r)) { |
| perror("setrlimit(RLIMIT_MEMLOCK)"); |
| return 1; |
| } |
| |
| ifindex_in = strtoul(argv[optind], NULL, 0); |
| ifindex_out = strtoul(argv[optind + 1], NULL, 0); |
| printf("input: %d output: %d\n", ifindex_in, ifindex_out); |
| |
| 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; |
| } |
| |
| if (bpf_set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) { |
| printf("ERROR: link set xdp fd failed on %d\n", ifindex_in); |
| return 1; |
| } |
| |
| /* Loading dummy XDP prog on out-device */ |
| if (bpf_set_link_xdp_fd(ifindex_out, prog_fd[1], |
| (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) { |
| printf("WARN: link set xdp fd failed on %d\n", ifindex_out); |
| ifindex_out_xdp_dummy_attached = false; |
| } |
| |
| signal(SIGINT, int_exit); |
| signal(SIGTERM, int_exit); |
| |
| printf("map[0] (vports) = %i, map[1] (map) = %i, map[2] (count) = %i\n", |
| map_fd[0], map_fd[1], map_fd[2]); |
| |
| /* populate virtual to physical port map */ |
| ret = bpf_map_update_elem(map_fd[0], &key, &ifindex_out, 0); |
| if (ret) { |
| perror("bpf_update_elem"); |
| goto out; |
| } |
| |
| poll_stats(2, ifindex_out); |
| |
| out: |
| return 0; |
| } |