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

TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/bpf/xdping.c

Version: ~ [ linux-5.18-rc6 ] ~ [ linux-5.17.6 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.38 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.114 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.192 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.241 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.277 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.312 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
  3 
  4 #include <linux/bpf.h>
  5 #include <linux/if_link.h>
  6 #include <arpa/inet.h>
  7 #include <assert.h>
  8 #include <errno.h>
  9 #include <signal.h>
 10 #include <stdio.h>
 11 #include <stdlib.h>
 12 #include <string.h>
 13 #include <unistd.h>
 14 #include <libgen.h>
 15 #include <sys/resource.h>
 16 #include <net/if.h>
 17 #include <sys/types.h>
 18 #include <sys/socket.h>
 19 #include <netdb.h>
 20 
 21 #include "bpf/bpf.h"
 22 #include "bpf/libbpf.h"
 23 
 24 #include "xdping.h"
 25 
 26 static int ifindex;
 27 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 28 
 29 static void cleanup(int sig)
 30 {
 31         bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
 32         if (sig)
 33                 exit(1);
 34 }
 35 
 36 static int get_stats(int fd, __u16 count, __u32 raddr)
 37 {
 38         struct pinginfo pinginfo = { 0 };
 39         char inaddrbuf[INET_ADDRSTRLEN];
 40         struct in_addr inaddr;
 41         __u16 i;
 42 
 43         inaddr.s_addr = raddr;
 44 
 45         printf("\nXDP RTT data:\n");
 46 
 47         if (bpf_map_lookup_elem(fd, &raddr, &pinginfo)) {
 48                 perror("bpf_map_lookup elem");
 49                 return 1;
 50         }
 51 
 52         for (i = 0; i < count; i++) {
 53                 if (pinginfo.times[i] == 0)
 54                         break;
 55 
 56                 printf("64 bytes from %s: icmp_seq=%d ttl=64 time=%#.5f ms\n",
 57                        inet_ntop(AF_INET, &inaddr, inaddrbuf,
 58                                  sizeof(inaddrbuf)),
 59                        count + i + 1,
 60                        (double)pinginfo.times[i]/1000000);
 61         }
 62 
 63         if (i < count) {
 64                 fprintf(stderr, "Expected %d samples, got %d.\n", count, i);
 65                 return 1;
 66         }
 67 
 68         bpf_map_delete_elem(fd, &raddr);
 69 
 70         return 0;
 71 }
 72 
 73 static void show_usage(const char *prog)
 74 {
 75         fprintf(stderr,
 76                 "usage: %s [OPTS] -I interface destination\n\n"
 77                 "OPTS:\n"
 78                 "    -c count           Stop after sending count requests\n"
 79                 "                       (default %d, max %d)\n"
 80                 "    -I interface       interface name\n"
 81                 "    -N                 Run in driver mode\n"
 82                 "    -s                 Server mode\n"
 83                 "    -S                 Run in skb mode\n",
 84                 prog, XDPING_DEFAULT_COUNT, XDPING_MAX_COUNT);
 85 }
 86 
 87 int main(int argc, char **argv)
 88 {
 89         __u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
 90         struct addrinfo *a, hints = { .ai_family = AF_INET };
 91         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 92         __u16 count = XDPING_DEFAULT_COUNT;
 93         struct pinginfo pinginfo = { 0 };
 94         const char *optstr = "c:I:NsS";
 95         struct bpf_program *main_prog;
 96         int prog_fd = -1, map_fd = -1;
 97         struct sockaddr_in rin;
 98         struct bpf_object *obj;
 99         struct bpf_map *map;
100         char *ifname = NULL;
101         char filename[256];
102         int opt, ret = 1;
103         __u32 raddr = 0;
104         int server = 0;
105         char cmd[256];
106 
107         while ((opt = getopt(argc, argv, optstr)) != -1) {
108                 switch (opt) {
109                 case 'c':
110                         count = atoi(optarg);
111                         if (count < 1 || count > XDPING_MAX_COUNT) {
112                                 fprintf(stderr,
113                                         "min count is 1, max count is %d\n",
114                                         XDPING_MAX_COUNT);
115                                 return 1;
116                         }
117                         break;
118                 case 'I':
119                         ifname = optarg;
120                         ifindex = if_nametoindex(ifname);
121                         if (!ifindex) {
122                                 fprintf(stderr, "Could not get interface %s\n",
123                                         ifname);
124                                 return 1;
125                         }
126                         break;
127                 case 'N':
128                         xdp_flags |= XDP_FLAGS_DRV_MODE;
129                         break;
130                 case 's':
131                         /* use server program */
132                         server = 1;
133                         break;
134                 case 'S':
135                         xdp_flags |= XDP_FLAGS_SKB_MODE;
136                         break;
137                 default:
138                         show_usage(basename(argv[0]));
139                         return 1;
140                 }
141         }
142 
143         if (!ifname) {
144                 show_usage(basename(argv[0]));
145                 return 1;
146         }
147         if (!server && optind == argc) {
148                 show_usage(basename(argv[0]));
149                 return 1;
150         }
151 
152         if ((xdp_flags & mode_flags) == mode_flags) {
153                 fprintf(stderr, "-N or -S can be specified, not both.\n");
154                 show_usage(basename(argv[0]));
155                 return 1;
156         }
157 
158         if (!server) {
159                 /* Only supports IPv4; see hints initiailization above. */
160                 if (getaddrinfo(argv[optind], NULL, &hints, &a) || !a) {
161                         fprintf(stderr, "Could not resolve %s\n", argv[optind]);
162                         return 1;
163                 }
164                 memcpy(&rin, a->ai_addr, sizeof(rin));
165                 raddr = rin.sin_addr.s_addr;
166                 freeaddrinfo(a);
167         }
168 
169         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
170                 perror("setrlimit(RLIMIT_MEMLOCK)");
171                 return 1;
172         }
173 
174         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
175 
176         if (bpf_prog_load(filename, BPF_PROG_TYPE_XDP, &obj, &prog_fd)) {
177                 fprintf(stderr, "load of %s failed\n", filename);
178                 return 1;
179         }
180 
181         main_prog = bpf_object__find_program_by_title(obj,
182                                                       server ? "xdpserver" :
183                                                                "xdpclient");
184         if (main_prog)
185                 prog_fd = bpf_program__fd(main_prog);
186         if (!main_prog || prog_fd < 0) {
187                 fprintf(stderr, "could not find xdping program");
188                 return 1;
189         }
190 
191         map = bpf_map__next(NULL, obj);
192         if (map)
193                 map_fd = bpf_map__fd(map);
194         if (!map || map_fd < 0) {
195                 fprintf(stderr, "Could not find ping map");
196                 goto done;
197         }
198 
199         signal(SIGINT, cleanup);
200         signal(SIGTERM, cleanup);
201 
202         printf("Setting up XDP for %s, please wait...\n", ifname);
203 
204         printf("XDP setup disrupts network connectivity, hit Ctrl+C to quit\n");
205 
206         if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
207                 fprintf(stderr, "Link set xdp fd failed for %s\n", ifname);
208                 goto done;
209         }
210 
211         if (server) {
212                 close(prog_fd);
213                 close(map_fd);
214                 printf("Running server on %s; press Ctrl+C to exit...\n",
215                        ifname);
216                 do { } while (1);
217         }
218 
219         /* Start xdping-ing from last regular ping reply, e.g. for a count
220          * of 10 ICMP requests, we start xdping-ing using reply with seq number
221          * 10.  The reason the last "real" ping RTT is much higher is that
222          * the ping program sees the ICMP reply associated with the last
223          * XDP-generated packet, so ping doesn't get a reply until XDP is done.
224          */
225         pinginfo.seq = htons(count);
226         pinginfo.count = count;
227 
228         if (bpf_map_update_elem(map_fd, &raddr, &pinginfo, BPF_ANY)) {
229                 fprintf(stderr, "could not communicate with BPF map: %s\n",
230                         strerror(errno));
231                 cleanup(0);
232                 goto done;
233         }
234 
235         /* We need to wait for XDP setup to complete. */
236         sleep(10);
237 
238         snprintf(cmd, sizeof(cmd), "ping -c %d -I %s %s",
239                  count, ifname, argv[optind]);
240 
241         printf("\nNormal ping RTT data\n");
242         printf("[Ignore final RTT; it is distorted by XDP using the reply]\n");
243 
244         ret = system(cmd);
245 
246         if (!ret)
247                 ret = get_stats(map_fd, count, raddr);
248 
249         cleanup(0);
250 
251 done:
252         if (prog_fd > 0)
253                 close(prog_fd);
254         if (map_fd > 0)
255                 close(map_fd);
256 
257         return ret;
258 }
259 

~ [ 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