1 // SPDX-License-Identifier: GPL-2.0
5 #include <linux/perf_event.h>
10 #include <sys/sysinfo.h>
11 #include <sys/ioctl.h>
17 #include "trace_helpers.h"
20 static int pmu_fds[MAX_CPUS], if_idx;
21 static struct perf_event_mmap_page *headers[MAX_CPUS];
24 static int do_attach(int idx, int fd, const char *name)
28 err = bpf_set_link_xdp_fd(idx, fd, 0);
30 printf("ERROR: failed to attach program to %s\n", name);
35 static int do_detach(int idx, const char *name)
39 err = bpf_set_link_xdp_fd(idx, -1, 0);
41 printf("ERROR: failed to detach program from %s\n", name);
46 #define SAMPLE_SIZE 64
48 static int print_bpf_output(void *data, int size)
53 __u8 pkt_data[SAMPLE_SIZE];
57 if (e->cookie != 0xdead) {
58 printf("BUG cookie %x sized %d\n",
60 return LIBBPF_PERF_EVENT_ERROR;
63 printf("Pkt len: %-5d bytes. Ethernet hdr: ", e->pkt_len);
64 for (i = 0; i < 14 && i < e->pkt_len; i++)
65 printf("%02x ", e->pkt_data[i]);
68 return LIBBPF_PERF_EVENT_CONT;
71 static void test_bpf_perf_event(int map_fd, int num)
73 struct perf_event_attr attr = {
74 .sample_type = PERF_SAMPLE_RAW,
75 .type = PERF_TYPE_SOFTWARE,
76 .config = PERF_COUNT_SW_BPF_OUTPUT,
77 .wakeup_events = 1, /* get an fd notification for every event */
81 for (i = 0; i < num; i++) {
84 pmu_fds[i] = sys_perf_event_open(&attr, -1/*pid*/, i/*cpu*/,
87 assert(pmu_fds[i] >= 0);
88 assert(bpf_map_update_elem(map_fd, &key,
89 &pmu_fds[i], BPF_ANY) == 0);
90 ioctl(pmu_fds[i], PERF_EVENT_IOC_ENABLE, 0);
94 static void sig_handler(int signo)
96 do_detach(if_idx, if_name);
100 int main(int argc, char **argv)
102 struct bpf_prog_load_attr prog_load_attr = {
103 .prog_type = BPF_PROG_TYPE_XDP,
105 struct bpf_object *obj;
113 printf("Usage: %s <ifname>\n", argv[0]);
117 numcpus = get_nprocs();
118 if (numcpus > MAX_CPUS)
121 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
122 prog_load_attr.file = filename;
124 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
128 printf("load_bpf_file: %s\n", strerror(errno));
132 map = bpf_map__next(NULL, obj);
134 printf("finding a map in obj file failed\n");
137 map_fd = bpf_map__fd(map);
139 if_idx = if_nametoindex(argv[1]);
141 if_idx = strtoul(argv[1], NULL, 0);
144 fprintf(stderr, "Invalid ifname\n");
148 err = do_attach(if_idx, prog_fd, argv[1]);
152 if (signal(SIGINT, sig_handler) ||
153 signal(SIGHUP, sig_handler) ||
154 signal(SIGTERM, sig_handler)) {
159 test_bpf_perf_event(map_fd, numcpus);
161 for (i = 0; i < numcpus; i++)
162 if (perf_event_mmap_header(pmu_fds[i], &headers[i]) < 0)
165 ret = perf_event_poller_multi(pmu_fds, headers, numcpus,