1
2
3
4static const char *__doc__ = " XDP RX-queue info extract example\n\n"
5 "Monitor how many packets per sec (pps) are received\n"
6 "per NIC RX queue index and which CPU processed the packet\n"
7 ;
8
9#include <errno.h>
10#include <signal.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <stdbool.h>
14#include <string.h>
15#include <unistd.h>
16#include <locale.h>
17#include <sys/resource.h>
18#include <getopt.h>
19#include <net/if.h>
20#include <time.h>
21
22#include <arpa/inet.h>
23#include <linux/if_link.h>
24
25#include <bpf/bpf.h>
26#include <bpf/libbpf.h>
27#include "bpf_util.h"
28
29static int ifindex = -1;
30static char ifname_buf[IF_NAMESIZE];
31static char *ifname;
32static __u32 prog_id;
33
34static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
35
36static struct bpf_map *stats_global_map;
37static struct bpf_map *rx_queue_index_map;
38
39
40#define EXIT_OK 0
41#define EXIT_FAIL 1
42#define EXIT_FAIL_OPTION 2
43#define EXIT_FAIL_XDP 3
44#define EXIT_FAIL_BPF 4
45#define EXIT_FAIL_MEM 5
46
47static const struct option long_options[] = {
48 {"help", no_argument, NULL, 'h' },
49 {"dev", required_argument, NULL, 'd' },
50 {"skb-mode", no_argument, NULL, 'S' },
51 {"sec", required_argument, NULL, 's' },
52 {"no-separators", no_argument, NULL, 'z' },
53 {"action", required_argument, NULL, 'a' },
54 {"readmem", no_argument, NULL, 'r' },
55 {"swapmac", no_argument, NULL, 'm' },
56 {"force", no_argument, NULL, 'F' },
57 {0, 0, NULL, 0 }
58};
59
60static void int_exit(int sig)
61{
62 __u32 curr_prog_id = 0;
63
64 if (ifindex > -1) {
65 if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
66 printf("bpf_get_link_xdp_id failed\n");
67 exit(EXIT_FAIL);
68 }
69 if (prog_id == curr_prog_id) {
70 fprintf(stderr,
71 "Interrupted: Removing XDP program on ifindex:%d device:%s\n",
72 ifindex, ifname);
73 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
74 } else if (!curr_prog_id) {
75 printf("couldn't find a prog id on a given iface\n");
76 } else {
77 printf("program on interface changed, not removing\n");
78 }
79 }
80 exit(EXIT_OK);
81}
82
83struct config {
84 __u32 action;
85 int ifindex;
86 __u32 options;
87};
88enum cfg_options_flags {
89 NO_TOUCH = 0x0U,
90 READ_MEM = 0x1U,
91 SWAP_MAC = 0x2U,
92};
93#define XDP_ACTION_MAX (XDP_TX + 1)
94#define XDP_ACTION_MAX_STRLEN 11
95static const char *xdp_action_names[XDP_ACTION_MAX] = {
96 [XDP_ABORTED] = "XDP_ABORTED",
97 [XDP_DROP] = "XDP_DROP",
98 [XDP_PASS] = "XDP_PASS",
99 [XDP_TX] = "XDP_TX",
100};
101
102static const char *action2str(int action)
103{
104 if (action < XDP_ACTION_MAX)
105 return xdp_action_names[action];
106 return NULL;
107}
108
109static int parse_xdp_action(char *action_str)
110{
111 size_t maxlen;
112 __u64 action = -1;
113 int i;
114
115 for (i = 0; i < XDP_ACTION_MAX; i++) {
116 maxlen = XDP_ACTION_MAX_STRLEN;
117 if (strncmp(xdp_action_names[i], action_str, maxlen) == 0) {
118 action = i;
119 break;
120 }
121 }
122 return action;
123}
124
125static void list_xdp_actions(void)
126{
127 int i;
128
129 printf("Available XDP --action <options>\n");
130 for (i = 0; i < XDP_ACTION_MAX; i++)
131 printf("\t%s\n", xdp_action_names[i]);
132 printf("\n");
133}
134
135static char* options2str(enum cfg_options_flags flag)
136{
137 if (flag == NO_TOUCH)
138 return "no_touch";
139 if (flag & SWAP_MAC)
140 return "swapmac";
141 if (flag & READ_MEM)
142 return "read";
143 fprintf(stderr, "ERR: Unknown config option flags");
144 exit(EXIT_FAIL);
145}
146
147static void usage(char *argv[])
148{
149 int i;
150
151 printf("\nDOCUMENTATION:\n%s\n", __doc__);
152 printf(" Usage: %s (options-see-below)\n", argv[0]);
153 printf(" Listing options:\n");
154 for (i = 0; long_options[i].name != 0; i++) {
155 printf(" --%-12s", long_options[i].name);
156 if (long_options[i].flag != NULL)
157 printf(" flag (internal value:%d)",
158 *long_options[i].flag);
159 else
160 printf(" short-option: -%c",
161 long_options[i].val);
162 printf("\n");
163 }
164 printf("\n");
165 list_xdp_actions();
166}
167
168#define NANOSEC_PER_SEC 1000000000
169static __u64 gettime(void)
170{
171 struct timespec t;
172 int res;
173
174 res = clock_gettime(CLOCK_MONOTONIC, &t);
175 if (res < 0) {
176 fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
177 exit(EXIT_FAIL);
178 }
179 return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
180}
181
182
183struct datarec {
184 __u64 processed;
185 __u64 issue;
186};
187struct record {
188 __u64 timestamp;
189 struct datarec total;
190 struct datarec *cpu;
191};
192struct stats_record {
193 struct record stats;
194 struct record *rxq;
195};
196
197static struct datarec *alloc_record_per_cpu(void)
198{
199 unsigned int nr_cpus = bpf_num_possible_cpus();
200 struct datarec *array;
201
202 array = calloc(nr_cpus, sizeof(struct datarec));
203 if (!array) {
204 fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
205 exit(EXIT_FAIL_MEM);
206 }
207 return array;
208}
209
210static struct record *alloc_record_per_rxq(void)
211{
212 unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
213 struct record *array;
214
215 array = calloc(nr_rxqs, sizeof(struct record));
216 if (!array) {
217 fprintf(stderr, "Mem alloc error (nr_rxqs:%u)\n", nr_rxqs);
218 exit(EXIT_FAIL_MEM);
219 }
220 return array;
221}
222
223static struct stats_record *alloc_stats_record(void)
224{
225 unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
226 struct stats_record *rec;
227 int i;
228
229 rec = calloc(1, sizeof(struct stats_record));
230 if (!rec) {
231 fprintf(stderr, "Mem alloc error\n");
232 exit(EXIT_FAIL_MEM);
233 }
234 rec->rxq = alloc_record_per_rxq();
235 for (i = 0; i < nr_rxqs; i++)
236 rec->rxq[i].cpu = alloc_record_per_cpu();
237
238 rec->stats.cpu = alloc_record_per_cpu();
239 return rec;
240}
241
242static void free_stats_record(struct stats_record *r)
243{
244 unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
245 int i;
246
247 for (i = 0; i < nr_rxqs; i++)
248 free(r->rxq[i].cpu);
249
250 free(r->rxq);
251 free(r->stats.cpu);
252 free(r);
253}
254
255static bool map_collect_percpu(int fd, __u32 key, struct record *rec)
256{
257
258 unsigned int nr_cpus = bpf_num_possible_cpus();
259 struct datarec values[nr_cpus];
260 __u64 sum_processed = 0;
261 __u64 sum_issue = 0;
262 int i;
263
264 if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
265 fprintf(stderr,
266 "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
267 return false;
268 }
269
270 rec->timestamp = gettime();
271
272
273 for (i = 0; i < nr_cpus; i++) {
274 rec->cpu[i].processed = values[i].processed;
275 sum_processed += values[i].processed;
276 rec->cpu[i].issue = values[i].issue;
277 sum_issue += values[i].issue;
278 }
279 rec->total.processed = sum_processed;
280 rec->total.issue = sum_issue;
281 return true;
282}
283
284static void stats_collect(struct stats_record *rec)
285{
286 int fd, i, max_rxqs;
287
288 fd = bpf_map__fd(stats_global_map);
289 map_collect_percpu(fd, 0, &rec->stats);
290
291 fd = bpf_map__fd(rx_queue_index_map);
292 max_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
293 for (i = 0; i < max_rxqs; i++)
294 map_collect_percpu(fd, i, &rec->rxq[i]);
295}
296
297static double calc_period(struct record *r, struct record *p)
298{
299 double period_ = 0;
300 __u64 period = 0;
301
302 period = r->timestamp - p->timestamp;
303 if (period > 0)
304 period_ = ((double) period / NANOSEC_PER_SEC);
305
306 return period_;
307}
308
309static __u64 calc_pps(struct datarec *r, struct datarec *p, double period_)
310{
311 __u64 packets = 0;
312 __u64 pps = 0;
313
314 if (period_ > 0) {
315 packets = r->processed - p->processed;
316 pps = packets / period_;
317 }
318 return pps;
319}
320
321static __u64 calc_errs_pps(struct datarec *r,
322 struct datarec *p, double period_)
323{
324 __u64 packets = 0;
325 __u64 pps = 0;
326
327 if (period_ > 0) {
328 packets = r->issue - p->issue;
329 pps = packets / period_;
330 }
331 return pps;
332}
333
334static void stats_print(struct stats_record *stats_rec,
335 struct stats_record *stats_prev,
336 int action, __u32 cfg_opt)
337{
338 unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
339 unsigned int nr_cpus = bpf_num_possible_cpus();
340 double pps = 0, err = 0;
341 struct record *rec, *prev;
342 double t;
343 int rxq;
344 int i;
345
346
347 printf("\nRunning XDP on dev:%s (ifindex:%d) action:%s options:%s\n",
348 ifname, ifindex, action2str(action), options2str(cfg_opt));
349
350
351 {
352 char *fmt_rx = "%-15s %-7d %'-11.0f %'-10.0f %s\n";
353 char *fm2_rx = "%-15s %-7s %'-11.0f\n";
354 char *errstr = "";
355
356 printf("%-15s %-7s %-11s %-11s\n",
357 "XDP stats", "CPU", "pps", "issue-pps");
358
359 rec = &stats_rec->stats;
360 prev = &stats_prev->stats;
361 t = calc_period(rec, prev);
362 for (i = 0; i < nr_cpus; i++) {
363 struct datarec *r = &rec->cpu[i];
364 struct datarec *p = &prev->cpu[i];
365
366 pps = calc_pps (r, p, t);
367 err = calc_errs_pps(r, p, t);
368 if (err > 0)
369 errstr = "invalid-ifindex";
370 if (pps > 0)
371 printf(fmt_rx, "XDP-RX CPU",
372 i, pps, err, errstr);
373 }
374 pps = calc_pps (&rec->total, &prev->total, t);
375 err = calc_errs_pps(&rec->total, &prev->total, t);
376 printf(fm2_rx, "XDP-RX CPU", "total", pps, err);
377 }
378
379
380 printf("\n%-15s %-7s %-11s %-11s\n",
381 "RXQ stats", "RXQ:CPU", "pps", "issue-pps");
382
383 for (rxq = 0; rxq < nr_rxqs; rxq++) {
384 char *fmt_rx = "%-15s %3d:%-3d %'-11.0f %'-10.0f %s\n";
385 char *fm2_rx = "%-15s %3d:%-3s %'-11.0f\n";
386 char *errstr = "";
387 int rxq_ = rxq;
388
389
390 if (rxq_ == nr_rxqs - 1)
391 rxq_ = -1;
392
393 rec = &stats_rec->rxq[rxq];
394 prev = &stats_prev->rxq[rxq];
395 t = calc_period(rec, prev);
396 for (i = 0; i < nr_cpus; i++) {
397 struct datarec *r = &rec->cpu[i];
398 struct datarec *p = &prev->cpu[i];
399
400 pps = calc_pps (r, p, t);
401 err = calc_errs_pps(r, p, t);
402 if (err > 0) {
403 if (rxq_ == -1)
404 errstr = "map-overflow-RXQ";
405 else
406 errstr = "err";
407 }
408 if (pps > 0)
409 printf(fmt_rx, "rx_queue_index",
410 rxq_, i, pps, err, errstr);
411 }
412 pps = calc_pps (&rec->total, &prev->total, t);
413 err = calc_errs_pps(&rec->total, &prev->total, t);
414 if (pps || err)
415 printf(fm2_rx, "rx_queue_index", rxq_, "sum", pps, err);
416 }
417}
418
419
420
421static inline void swap(struct stats_record **a, struct stats_record **b)
422{
423 struct stats_record *tmp;
424
425 tmp = *a;
426 *a = *b;
427 *b = tmp;
428}
429
430static void stats_poll(int interval, int action, __u32 cfg_opt)
431{
432 struct stats_record *record, *prev;
433
434 record = alloc_stats_record();
435 prev = alloc_stats_record();
436 stats_collect(record);
437
438 while (1) {
439 swap(&prev, &record);
440 stats_collect(record);
441 stats_print(record, prev, action, cfg_opt);
442 sleep(interval);
443 }
444
445 free_stats_record(record);
446 free_stats_record(prev);
447}
448
449
450int main(int argc, char **argv)
451{
452 __u32 cfg_options= NO_TOUCH ;
453 struct bpf_prog_load_attr prog_load_attr = {
454 .prog_type = BPF_PROG_TYPE_XDP,
455 };
456 struct bpf_prog_info info = {};
457 __u32 info_len = sizeof(info);
458 int prog_fd, map_fd, opt, err;
459 bool use_separators = true;
460 struct config cfg = { 0 };
461 struct bpf_object *obj;
462 struct bpf_map *map;
463 char filename[256];
464 int longindex = 0;
465 int interval = 2;
466 __u32 key = 0;
467
468
469 char action_str_buf[XDP_ACTION_MAX_STRLEN + 1 ] = { 0 };
470 int action = XDP_PASS;
471 char *action_str = NULL;
472
473 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
474 prog_load_attr.file = filename;
475
476 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
477 return EXIT_FAIL;
478
479 map = bpf_object__find_map_by_name(obj, "config_map");
480 stats_global_map = bpf_object__find_map_by_name(obj, "stats_global_map");
481 rx_queue_index_map = bpf_object__find_map_by_name(obj, "rx_queue_index_map");
482 if (!map || !stats_global_map || !rx_queue_index_map) {
483 printf("finding a map in obj file failed\n");
484 return EXIT_FAIL;
485 }
486 map_fd = bpf_map__fd(map);
487
488 if (!prog_fd) {
489 fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n", strerror(errno));
490 return EXIT_FAIL;
491 }
492
493
494 while ((opt = getopt_long(argc, argv, "FhSrmzd:s:a:",
495 long_options, &longindex)) != -1) {
496 switch (opt) {
497 case 'd':
498 if (strlen(optarg) >= IF_NAMESIZE) {
499 fprintf(stderr, "ERR: --dev name too long\n");
500 goto error;
501 }
502 ifname = (char *)&ifname_buf;
503 strncpy(ifname, optarg, IF_NAMESIZE);
504 ifindex = if_nametoindex(ifname);
505 if (ifindex == 0) {
506 fprintf(stderr,
507 "ERR: --dev name unknown err(%d):%s\n",
508 errno, strerror(errno));
509 goto error;
510 }
511 break;
512 case 's':
513 interval = atoi(optarg);
514 break;
515 case 'S':
516 xdp_flags |= XDP_FLAGS_SKB_MODE;
517 break;
518 case 'z':
519 use_separators = false;
520 break;
521 case 'a':
522 action_str = (char *)&action_str_buf;
523 strncpy(action_str, optarg, XDP_ACTION_MAX_STRLEN);
524 break;
525 case 'r':
526 cfg_options |= READ_MEM;
527 break;
528 case 'm':
529 cfg_options |= SWAP_MAC;
530 break;
531 case 'F':
532 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
533 break;
534 case 'h':
535 error:
536 default:
537 usage(argv);
538 return EXIT_FAIL_OPTION;
539 }
540 }
541
542 if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
543 xdp_flags |= XDP_FLAGS_DRV_MODE;
544
545
546 if (ifindex == -1) {
547 fprintf(stderr, "ERR: required option --dev missing\n");
548 usage(argv);
549 return EXIT_FAIL_OPTION;
550 }
551 cfg.ifindex = ifindex;
552
553
554 if (action_str) {
555 action = parse_xdp_action(action_str);
556 if (action < 0) {
557 fprintf(stderr, "ERR: Invalid XDP --action: %s\n",
558 action_str);
559 list_xdp_actions();
560 return EXIT_FAIL_OPTION;
561 }
562 }
563 cfg.action = action;
564
565
566 if (action == XDP_TX)
567 cfg_options |= SWAP_MAC;
568 cfg.options = cfg_options;
569
570
571 if (use_separators)
572 setlocale(LC_NUMERIC, "en_US");
573
574
575 err = bpf_map_update_elem(map_fd, &key, &cfg, 0);
576 if (err) {
577 fprintf(stderr, "Store config failed (err:%d)\n", err);
578 exit(EXIT_FAIL_BPF);
579 }
580
581
582 signal(SIGINT, int_exit);
583 signal(SIGTERM, int_exit);
584
585 if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
586 fprintf(stderr, "link set xdp fd failed\n");
587 return EXIT_FAIL_XDP;
588 }
589
590 err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
591 if (err) {
592 printf("can't get prog info - %s\n", strerror(errno));
593 return err;
594 }
595 prog_id = info.id;
596
597 stats_poll(interval, action, cfg_options);
598 return EXIT_OK;
599}
600
