1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io
5 #include <linux/if_link.h>
15 #include <sys/resource.h>
19 #include "bpf/libbpf.h"
21 static int ifindex_in;
22 static int ifindex_out;
23 static bool ifindex_out_xdp_dummy_attached = true;
25 static __u32 dummy_prog_id;
27 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
28 static int rxcnt_map_fd;
30 static void int_exit(int sig)
32 __u32 curr_prog_id = 0;
34 if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) {
35 printf("bpf_get_link_xdp_id failed\n");
38 if (prog_id == curr_prog_id)
39 bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
40 else if (!curr_prog_id)
41 printf("couldn't find a prog id on iface IN\n");
43 printf("program on iface IN changed, not removing\n");
45 if (ifindex_out_xdp_dummy_attached) {
47 if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id,
49 printf("bpf_get_link_xdp_id failed\n");
52 if (dummy_prog_id == curr_prog_id)
53 bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
54 else if (!curr_prog_id)
55 printf("couldn't find a prog id on iface OUT\n");
57 printf("program on iface OUT changed, not removing\n");
62 static void poll_stats(int interval, int ifindex)
64 unsigned int nr_cpus = bpf_num_possible_cpus();
65 __u64 values[nr_cpus], prev[nr_cpus];
67 memset(prev, 0, sizeof(prev));
75 assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0);
76 for (i = 0; i < nr_cpus; i++)
77 sum += (values[i] - prev[i]);
79 printf("ifindex %i: %10llu pkt/s\n",
80 ifindex, sum / interval);
81 memcpy(prev, values, sizeof(values));
85 static void usage(const char *prog)
88 "usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
91 " -N enforce native mode\n"
92 " -F force loading prog\n",
96 int main(int argc, char **argv)
98 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
99 struct bpf_prog_load_attr prog_load_attr = {
100 .prog_type = BPF_PROG_TYPE_XDP,
102 struct bpf_program *prog, *dummy_prog;
103 struct bpf_prog_info info = {};
104 __u32 info_len = sizeof(info);
105 int prog_fd, dummy_prog_fd;
106 const char *optstr = "FSN";
107 struct bpf_object *obj;
108 int ret, opt, key = 0;
112 while ((opt = getopt(argc, argv, optstr)) != -1) {
115 xdp_flags |= XDP_FLAGS_SKB_MODE;
118 xdp_flags |= XDP_FLAGS_DRV_MODE;
121 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
124 usage(basename(argv[0]));
129 if (optind == argc) {
130 printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]);
134 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
135 perror("setrlimit(RLIMIT_MEMLOCK)");
139 ifindex_in = strtoul(argv[optind], NULL, 0);
140 ifindex_out = strtoul(argv[optind + 1], NULL, 0);
141 printf("input: %d output: %d\n", ifindex_in, ifindex_out);
143 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
144 prog_load_attr.file = filename;
146 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
149 prog = bpf_program__next(NULL, obj);
150 dummy_prog = bpf_program__next(prog, obj);
151 if (!prog || !dummy_prog) {
152 printf("finding a prog in obj file failed\n");
155 /* bpf_prog_load_xattr gives us the pointer to first prog's fd,
156 * so we're missing only the fd for dummy prog
158 dummy_prog_fd = bpf_program__fd(dummy_prog);
159 if (prog_fd < 0 || dummy_prog_fd < 0) {
160 printf("bpf_prog_load_xattr: %s\n", strerror(errno));
164 tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
165 rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
166 if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) {
167 printf("bpf_object__find_map_fd_by_name failed\n");
171 if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) {
172 printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
176 ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
178 printf("can't get prog info - %s\n", strerror(errno));
183 /* Loading dummy XDP prog on out-device */
184 if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd,
185 (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
186 printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
187 ifindex_out_xdp_dummy_attached = false;
190 memset(&info, 0, sizeof(info));
191 ret = bpf_obj_get_info_by_fd(dummy_prog_fd, &info, &info_len);
193 printf("can't get prog info - %s\n", strerror(errno));
196 dummy_prog_id = info.id;
198 signal(SIGINT, int_exit);
199 signal(SIGTERM, int_exit);
201 /* populate virtual to physical port map */
202 ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0);
204 perror("bpf_update_elem");
208 poll_stats(2, ifindex_out);