~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/samples/bpf/xdp_sample_pkts_user.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <stdio.h>
  3 #include <stdlib.h>
  4 #include <string.h>
  5 #include <linux/perf_event.h>
  6 #include <linux/bpf.h>
  7 #include <net/if.h>
  8 #include <errno.h>
  9 #include <assert.h>
 10 #include <sys/sysinfo.h>
 11 #include <sys/ioctl.h>
 12 #include <signal.h>
 13 #include <libbpf.h>
 14 #include <bpf/bpf.h>
 15 #include <sys/resource.h>
 16 #include <libgen.h>
 17 #include <linux/if_link.h>
 18 
 19 #include "perf-sys.h"
 20 #include "trace_helpers.h"
 21 
 22 #define MAX_CPUS 128
 23 static int pmu_fds[MAX_CPUS], if_idx;
 24 static struct perf_event_mmap_page *headers[MAX_CPUS];
 25 static char *if_name;
 26 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 27 static __u32 prog_id;
 28 
 29 static int do_attach(int idx, int fd, const char *name)
 30 {
 31         struct bpf_prog_info info = {};
 32         __u32 info_len = sizeof(info);
 33         int err;
 34 
 35         err = bpf_set_link_xdp_fd(idx, fd, xdp_flags);
 36         if (err < 0) {
 37                 printf("ERROR: failed to attach program to %s\n", name);
 38                 return err;
 39         }
 40 
 41         err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
 42         if (err) {
 43                 printf("can't get prog info - %s\n", strerror(errno));
 44                 return err;
 45         }
 46         prog_id = info.id;
 47 
 48         return err;
 49 }
 50 
 51 static int do_detach(int idx, const char *name)
 52 {
 53         __u32 curr_prog_id = 0;
 54         int err = 0;
 55 
 56         err = bpf_get_link_xdp_id(idx, &curr_prog_id, 0);
 57         if (err) {
 58                 printf("bpf_get_link_xdp_id failed\n");
 59                 return err;
 60         }
 61         if (prog_id == curr_prog_id) {
 62                 err = bpf_set_link_xdp_fd(idx, -1, 0);
 63                 if (err < 0)
 64                         printf("ERROR: failed to detach prog from %s\n", name);
 65         } else if (!curr_prog_id) {
 66                 printf("couldn't find a prog id on a %s\n", name);
 67         } else {
 68                 printf("program on interface changed, not removing\n");
 69         }
 70 
 71         return err;
 72 }
 73 
 74 #define SAMPLE_SIZE 64
 75 
 76 static int print_bpf_output(void *data, int size)
 77 {
 78         struct {
 79                 __u16 cookie;
 80                 __u16 pkt_len;
 81                 __u8  pkt_data[SAMPLE_SIZE];
 82         } __packed *e = data;
 83         int i;
 84 
 85         if (e->cookie != 0xdead) {
 86                 printf("BUG cookie %x sized %d\n",
 87                        e->cookie, size);
 88                 return LIBBPF_PERF_EVENT_ERROR;
 89         }
 90 
 91         printf("Pkt len: %-5d bytes. Ethernet hdr: ", e->pkt_len);
 92         for (i = 0; i < 14 && i < e->pkt_len; i++)
 93                 printf("%02x ", e->pkt_data[i]);
 94         printf("\n");
 95 
 96         return LIBBPF_PERF_EVENT_CONT;
 97 }
 98 
 99 static void test_bpf_perf_event(int map_fd, int num)
100 {
101         struct perf_event_attr attr = {
102                 .sample_type = PERF_SAMPLE_RAW,
103                 .type = PERF_TYPE_SOFTWARE,
104                 .config = PERF_COUNT_SW_BPF_OUTPUT,
105                 .wakeup_events = 1, /* get an fd notification for every event */
106         };
107         int i;
108 
109         for (i = 0; i < num; i++) {
110                 int key = i;
111 
112                 pmu_fds[i] = sys_perf_event_open(&attr, -1/*pid*/, i/*cpu*/,
113                                                  -1/*group_fd*/, 0);
114 
115                 assert(pmu_fds[i] >= 0);
116                 assert(bpf_map_update_elem(map_fd, &key,
117                                            &pmu_fds[i], BPF_ANY) == 0);
118                 ioctl(pmu_fds[i], PERF_EVENT_IOC_ENABLE, 0);
119         }
120 }
121 
122 static void sig_handler(int signo)
123 {
124         do_detach(if_idx, if_name);
125         exit(0);
126 }
127 
128 static void usage(const char *prog)
129 {
130         fprintf(stderr,
131                 "%s: %s [OPTS] <ifname|ifindex>\n\n"
132                 "OPTS:\n"
133                 "    -F    force loading prog\n",
134                 __func__, prog);
135 }
136 
137 int main(int argc, char **argv)
138 {
139         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
140         struct bpf_prog_load_attr prog_load_attr = {
141                 .prog_type      = BPF_PROG_TYPE_XDP,
142         };
143         const char *optstr = "F";
144         int prog_fd, map_fd, opt;
145         struct bpf_object *obj;
146         struct bpf_map *map;
147         char filename[256];
148         int ret, err, i;
149         int numcpus;
150 
151         while ((opt = getopt(argc, argv, optstr)) != -1) {
152                 switch (opt) {
153                 case 'F':
154                         xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
155                         break;
156                 default:
157                         usage(basename(argv[0]));
158                         return 1;
159                 }
160         }
161 
162         if (optind == argc) {
163                 usage(basename(argv[0]));
164                 return 1;
165         }
166 
167         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
168                 perror("setrlimit(RLIMIT_MEMLOCK)");
169                 return 1;
170         }
171 
172         numcpus = get_nprocs();
173         if (numcpus > MAX_CPUS)
174                 numcpus = MAX_CPUS;
175 
176         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
177         prog_load_attr.file = filename;
178 
179         if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
180                 return 1;
181 
182         if (!prog_fd) {
183                 printf("load_bpf_file: %s\n", strerror(errno));
184                 return 1;
185         }
186 
187         map = bpf_map__next(NULL, obj);
188         if (!map) {
189                 printf("finding a map in obj file failed\n");
190                 return 1;
191         }
192         map_fd = bpf_map__fd(map);
193 
194         if_idx = if_nametoindex(argv[optind]);
195         if (!if_idx)
196                 if_idx = strtoul(argv[optind], NULL, 0);
197 
198         if (!if_idx) {
199                 fprintf(stderr, "Invalid ifname\n");
200                 return 1;
201         }
202         if_name = argv[optind];
203         err = do_attach(if_idx, prog_fd, if_name);
204         if (err)
205                 return err;
206 
207         if (signal(SIGINT, sig_handler) ||
208             signal(SIGHUP, sig_handler) ||
209             signal(SIGTERM, sig_handler)) {
210                 perror("signal");
211                 return 1;
212         }
213 
214         test_bpf_perf_event(map_fd, numcpus);
215 
216         for (i = 0; i < numcpus; i++)
217                 if (perf_event_mmap_header(pmu_fds[i], &headers[i]) < 0)
218                         return 1;
219 
220         ret = perf_event_poller_multi(pmu_fds, headers, numcpus,
221                                       print_bpf_output);
222         kill(0, SIGINT);
223         return ret;
224 }
225 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp