![Toke Høiland-Jørgensen](/assets/img/avatar_default.png)
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386
("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
223 lines
5.4 KiB
C
223 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io
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*/
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#include <linux/bpf.h>
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#include <linux/if_link.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <net/if.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <sys/resource.h>
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#include "bpf_util.h"
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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static int ifindex_in;
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static int ifindex_out;
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static bool ifindex_out_xdp_dummy_attached = true;
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static __u32 prog_id;
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static __u32 dummy_prog_id;
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static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
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static int rxcnt_map_fd;
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static void int_exit(int sig)
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{
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__u32 curr_prog_id = 0;
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if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) {
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printf("bpf_get_link_xdp_id failed\n");
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exit(1);
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}
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if (prog_id == curr_prog_id)
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bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
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else if (!curr_prog_id)
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printf("couldn't find a prog id on iface IN\n");
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else
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printf("program on iface IN changed, not removing\n");
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if (ifindex_out_xdp_dummy_attached) {
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curr_prog_id = 0;
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if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id,
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xdp_flags)) {
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printf("bpf_get_link_xdp_id failed\n");
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exit(1);
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}
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if (dummy_prog_id == curr_prog_id)
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bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
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else if (!curr_prog_id)
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printf("couldn't find a prog id on iface OUT\n");
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else
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printf("program on iface OUT changed, not removing\n");
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}
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exit(0);
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}
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static void poll_stats(int interval, int ifindex)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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__u64 values[nr_cpus], prev[nr_cpus];
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memset(prev, 0, sizeof(prev));
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while (1) {
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__u64 sum = 0;
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__u32 key = 0;
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int i;
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sleep(interval);
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assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0);
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for (i = 0; i < nr_cpus; i++)
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sum += (values[i] - prev[i]);
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if (sum)
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printf("ifindex %i: %10llu pkt/s\n",
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ifindex, sum / interval);
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memcpy(prev, values, sizeof(values));
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}
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}
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static void usage(const char *prog)
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{
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fprintf(stderr,
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"usage: %s [OPTS] <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n\n"
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"OPTS:\n"
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" -S use skb-mode\n"
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" -N enforce native mode\n"
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" -F force loading prog\n",
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prog);
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_XDP,
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};
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struct bpf_program *prog, *dummy_prog;
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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int prog_fd, dummy_prog_fd;
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const char *optstr = "FSN";
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struct bpf_object *obj;
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int ret, opt, key = 0;
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char filename[256];
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int tx_port_map_fd;
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while ((opt = getopt(argc, argv, optstr)) != -1) {
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switch (opt) {
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case 'S':
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xdp_flags |= XDP_FLAGS_SKB_MODE;
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break;
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case 'N':
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/* default, set below */
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break;
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case 'F':
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xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
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break;
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default:
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usage(basename(argv[0]));
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return 1;
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}
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}
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if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
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xdp_flags |= XDP_FLAGS_DRV_MODE;
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if (optind == argc) {
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printf("usage: %s <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n", argv[0]);
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return 1;
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}
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if (setrlimit(RLIMIT_MEMLOCK, &r)) {
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perror("setrlimit(RLIMIT_MEMLOCK)");
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return 1;
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}
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ifindex_in = if_nametoindex(argv[optind]);
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if (!ifindex_in)
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ifindex_in = strtoul(argv[optind], NULL, 0);
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ifindex_out = if_nametoindex(argv[optind + 1]);
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if (!ifindex_out)
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ifindex_out = strtoul(argv[optind + 1], NULL, 0);
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printf("input: %d output: %d\n", ifindex_in, ifindex_out);
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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prog_load_attr.file = filename;
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if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
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return 1;
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prog = bpf_program__next(NULL, obj);
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dummy_prog = bpf_program__next(prog, obj);
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if (!prog || !dummy_prog) {
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printf("finding a prog in obj file failed\n");
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return 1;
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}
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/* bpf_prog_load_xattr gives us the pointer to first prog's fd,
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* so we're missing only the fd for dummy prog
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*/
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dummy_prog_fd = bpf_program__fd(dummy_prog);
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if (prog_fd < 0 || dummy_prog_fd < 0) {
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printf("bpf_prog_load_xattr: %s\n", strerror(errno));
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return 1;
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}
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tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
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rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
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if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) {
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printf("bpf_object__find_map_fd_by_name failed\n");
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return 1;
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}
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if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) {
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printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
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return 1;
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}
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ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
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if (ret) {
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printf("can't get prog info - %s\n", strerror(errno));
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return ret;
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}
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prog_id = info.id;
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/* Loading dummy XDP prog on out-device */
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if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd,
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(xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
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printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
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ifindex_out_xdp_dummy_attached = false;
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}
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memset(&info, 0, sizeof(info));
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ret = bpf_obj_get_info_by_fd(dummy_prog_fd, &info, &info_len);
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if (ret) {
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printf("can't get prog info - %s\n", strerror(errno));
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return ret;
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}
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dummy_prog_id = info.id;
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signal(SIGINT, int_exit);
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signal(SIGTERM, int_exit);
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/* populate virtual to physical port map */
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ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0);
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if (ret) {
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perror("bpf_update_elem");
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goto out;
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}
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poll_stats(2, ifindex_out);
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out:
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return 0;
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}
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