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9#include <errno.h>
10#include <fcntl.h>
11#include <stdio.h>
12#include <string.h>
13#include <stdlib.h>
14#include <stdint.h>
15#include <poll.h>
16#include <sys/types.h>
17#include <time.h>
18#include <unistd.h>
19#include <dirent.h>
20#include <signal.h>
21
22#define MAX_NUM_DEVICES 10
23#define MAX_SYSFS_PATH 0x200
24#define CSV_MAX_LINE 0x1000
25#define SYSFS_MAX_INT 0x20
26#define MAX_STR_LEN 255
27#define DEFAULT_ASYNC_TIMEOUT 200000
28
29struct dict {
30 char *name;
31 int type;
32};
33
34static struct dict dict[] = {
35 {"ping", 2},
36 {"transfer", 3},
37 {"sink", 4},
38 {NULL,}
39};
40
41struct loopback_results {
42 float latency_avg;
43 uint32_t latency_max;
44 uint32_t latency_min;
45 uint32_t latency_jitter;
46
47 float request_avg;
48 uint32_t request_max;
49 uint32_t request_min;
50 uint32_t request_jitter;
51
52 float throughput_avg;
53 uint32_t throughput_max;
54 uint32_t throughput_min;
55 uint32_t throughput_jitter;
56
57 float apbridge_unipro_latency_avg;
58 uint32_t apbridge_unipro_latency_max;
59 uint32_t apbridge_unipro_latency_min;
60 uint32_t apbridge_unipro_latency_jitter;
61
62 float gbphy_firmware_latency_avg;
63 uint32_t gbphy_firmware_latency_max;
64 uint32_t gbphy_firmware_latency_min;
65 uint32_t gbphy_firmware_latency_jitter;
66
67 uint32_t error;
68};
69
70struct loopback_device {
71 char name[MAX_SYSFS_PATH];
72 char sysfs_entry[MAX_SYSFS_PATH];
73 char debugfs_entry[MAX_SYSFS_PATH];
74 struct loopback_results results;
75};
76
77struct loopback_test {
78 int verbose;
79 int debug;
80 int raw_data_dump;
81 int porcelain;
82 int mask;
83 int size;
84 int iteration_max;
85 int aggregate_output;
86 int test_id;
87 int device_count;
88 int list_devices;
89 int use_async;
90 int async_timeout;
91 int async_outstanding_operations;
92 int us_wait;
93 int file_output;
94 int stop_all;
95 int poll_count;
96 char test_name[MAX_STR_LEN];
97 char sysfs_prefix[MAX_SYSFS_PATH];
98 char debugfs_prefix[MAX_SYSFS_PATH];
99 struct timespec poll_timeout;
100 struct loopback_device devices[MAX_NUM_DEVICES];
101 struct loopback_results aggregate_results;
102 struct pollfd fds[MAX_NUM_DEVICES];
103};
104
105struct loopback_test t;
106
107
108static inline int device_enabled(struct loopback_test *t, int dev_idx);
109
110#define GET_MAX(field) \
111static int get_##field##_aggregate(struct loopback_test *t) \
112{ \
113 uint32_t max = 0; \
114 int i; \
115 for (i = 0; i < t->device_count; i++) { \
116 if (!device_enabled(t, i)) \
117 continue; \
118 if (t->devices[i].results.field > max) \
119 max = t->devices[i].results.field; \
120 } \
121 return max; \
122} \
123
124#define GET_MIN(field) \
125static int get_##field##_aggregate(struct loopback_test *t) \
126{ \
127 uint32_t min = ~0; \
128 int i; \
129 for (i = 0; i < t->device_count; i++) { \
130 if (!device_enabled(t, i)) \
131 continue; \
132 if (t->devices[i].results.field < min) \
133 min = t->devices[i].results.field; \
134 } \
135 return min; \
136} \
137
138#define GET_AVG(field) \
139static int get_##field##_aggregate(struct loopback_test *t) \
140{ \
141 uint32_t val = 0; \
142 uint32_t count = 0; \
143 int i; \
144 for (i = 0; i < t->device_count; i++) { \
145 if (!device_enabled(t, i)) \
146 continue; \
147 count++; \
148 val += t->devices[i].results.field; \
149 } \
150 if (count) \
151 val /= count; \
152 return val; \
153} \
154
155GET_MAX(throughput_max);
156GET_MAX(request_max);
157GET_MAX(latency_max);
158GET_MAX(apbridge_unipro_latency_max);
159GET_MAX(gbphy_firmware_latency_max);
160GET_MIN(throughput_min);
161GET_MIN(request_min);
162GET_MIN(latency_min);
163GET_MIN(apbridge_unipro_latency_min);
164GET_MIN(gbphy_firmware_latency_min);
165GET_AVG(throughput_avg);
166GET_AVG(request_avg);
167GET_AVG(latency_avg);
168GET_AVG(apbridge_unipro_latency_avg);
169GET_AVG(gbphy_firmware_latency_avg);
170
171void abort(void)
172{
173 _exit(1);
174}
175
176void usage(void)
177{
178 fprintf(stderr, "Usage: loopback_test TEST [SIZE] ITERATIONS [SYSPATH] [DBGPATH]\n\n"
179 " Run TEST for a number of ITERATIONS with operation data SIZE bytes\n"
180 " TEST may be \'ping\' \'transfer\' or \'sink\'\n"
181 " SIZE indicates the size of transfer <= greybus max payload bytes\n"
182 " ITERATIONS indicates the number of times to execute TEST at SIZE bytes\n"
183 " Note if ITERATIONS is set to zero then this utility will\n"
184 " initiate an infinite (non terminating) test and exit\n"
185 " without logging any metrics data\n"
186 " SYSPATH indicates the sysfs path for the loopback greybus entries e.g.\n"
187 " /sys/bus/greybus/devices\n"
188 " DBGPATH indicates the debugfs path for the loopback greybus entries e.g.\n"
189 " /sys/kernel/debug/gb_loopback/\n"
190 " Mandatory arguments\n"
191 " -t must be one of the test names - sink, transfer or ping\n"
192 " -i iteration count - the number of iterations to run the test over\n"
193 " Optional arguments\n"
194 " -S sysfs location - location for greybus 'endo' entires default /sys/bus/greybus/devices/\n"
195 " -D debugfs location - location for loopback debugfs entries default /sys/kernel/debug/gb_loopback/\n"
196 " -s size of data packet to send during test - defaults to zero\n"
197 " -m mask - a bit mask of connections to include example: -m 8 = 4th connection -m 9 = 1st and 4th connection etc\n"
198 " default is zero which means broadcast to all connections\n"
199 " -v verbose output\n"
200 " -d debug output\n"
201 " -r raw data output - when specified the full list of latency values are included in the output CSV\n"
202 " -p porcelain - when specified printout is in a user-friendly non-CSV format. This option suppresses writing to CSV file\n"
203 " -a aggregate - show aggregation of all enabled devices\n"
204 " -l list found loopback devices and exit\n"
205 " -x Async - Enable async transfers\n"
206 " -o Async Timeout - Timeout in uSec for async operations\n"
207 " -O Poll loop time out in seconds(max time a test is expected to last, default: 30sec)\n"
208 " -c Max number of outstanding operations for async operations\n"
209 " -w Wait in uSec between operations\n"
210 " -z Enable output to a CSV file (incompatible with -p)\n"
211 " -f When starting new loopback test, stop currently running tests on all devices\n"
212 "Examples:\n"
213 " Send 10000 transfers with a packet size of 128 bytes to all active connections\n"
214 " loopback_test -t transfer -s 128 -i 10000 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
215 " loopback_test -t transfer -s 128 -i 10000 -m 0\n"
216 " Send 10000 transfers with a packet size of 128 bytes to connection 1 and 4\n"
217 " loopback_test -t transfer -s 128 -i 10000 -m 9\n"
218 " loopback_test -t ping -s 0 128 -i -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
219 " loopback_test -t sink -s 2030 -i 32768 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n");
220 abort();
221}
222
223static inline int device_enabled(struct loopback_test *t, int dev_idx)
224{
225 if (!t->mask || (t->mask & (1 << dev_idx)))
226 return 1;
227
228 return 0;
229}
230
231static void show_loopback_devices(struct loopback_test *t)
232{
233 int i;
234
235 if (t->device_count == 0) {
236 printf("No loopback devices.\n");
237 return;
238 }
239
240 for (i = 0; i < t->device_count; i++)
241 printf("device[%d] = %s\n", i, t->devices[i].name);
242
243}
244
245int open_sysfs(const char *sys_pfx, const char *node, int flags)
246{
247 int fd;
248 char path[MAX_SYSFS_PATH];
249
250 snprintf(path, sizeof(path), "%s%s", sys_pfx, node);
251 fd = open(path, flags);
252 if (fd < 0) {
253 fprintf(stderr, "unable to open %s\n", path);
254 abort();
255 }
256 return fd;
257}
258
259int read_sysfs_int_fd(int fd, const char *sys_pfx, const char *node)
260{
261 char buf[SYSFS_MAX_INT];
262
263 if (read(fd, buf, sizeof(buf)) < 0) {
264 fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
265 strerror(errno));
266 close(fd);
267 abort();
268 }
269 return atoi(buf);
270}
271
272float read_sysfs_float_fd(int fd, const char *sys_pfx, const char *node)
273{
274 char buf[SYSFS_MAX_INT];
275
276 if (read(fd, buf, sizeof(buf)) < 0) {
277
278 fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
279 strerror(errno));
280 close(fd);
281 abort();
282 }
283 return atof(buf);
284}
285
286int read_sysfs_int(const char *sys_pfx, const char *node)
287{
288 int fd, val;
289
290 fd = open_sysfs(sys_pfx, node, O_RDONLY);
291 val = read_sysfs_int_fd(fd, sys_pfx, node);
292 close(fd);
293 return val;
294}
295
296float read_sysfs_float(const char *sys_pfx, const char *node)
297{
298 int fd;
299 float val;
300
301 fd = open_sysfs(sys_pfx, node, O_RDONLY);
302 val = read_sysfs_float_fd(fd, sys_pfx, node);
303 close(fd);
304 return val;
305}
306
307void write_sysfs_val(const char *sys_pfx, const char *node, int val)
308{
309 int fd, len;
310 char buf[SYSFS_MAX_INT];
311
312 fd = open_sysfs(sys_pfx, node, O_RDWR);
313 len = snprintf(buf, sizeof(buf), "%d", val);
314 if (write(fd, buf, len) < 0) {
315 fprintf(stderr, "unable to write to %s%s %s\n", sys_pfx, node,
316 strerror(errno));
317 close(fd);
318 abort();
319 }
320 close(fd);
321}
322
323static int get_results(struct loopback_test *t)
324{
325 struct loopback_device *d;
326 struct loopback_results *r;
327 int i;
328
329 for (i = 0; i < t->device_count; i++) {
330 if (!device_enabled(t, i))
331 continue;
332
333 d = &t->devices[i];
334 r = &d->results;
335
336 r->error = read_sysfs_int(d->sysfs_entry, "error");
337 r->request_min = read_sysfs_int(d->sysfs_entry, "requests_per_second_min");
338 r->request_max = read_sysfs_int(d->sysfs_entry, "requests_per_second_max");
339 r->request_avg = read_sysfs_float(d->sysfs_entry, "requests_per_second_avg");
340
341 r->latency_min = read_sysfs_int(d->sysfs_entry, "latency_min");
342 r->latency_max = read_sysfs_int(d->sysfs_entry, "latency_max");
343 r->latency_avg = read_sysfs_float(d->sysfs_entry, "latency_avg");
344
345 r->throughput_min = read_sysfs_int(d->sysfs_entry, "throughput_min");
346 r->throughput_max = read_sysfs_int(d->sysfs_entry, "throughput_max");
347 r->throughput_avg = read_sysfs_float(d->sysfs_entry, "throughput_avg");
348
349 r->apbridge_unipro_latency_min =
350 read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_min");
351 r->apbridge_unipro_latency_max =
352 read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_max");
353 r->apbridge_unipro_latency_avg =
354 read_sysfs_float(d->sysfs_entry, "apbridge_unipro_latency_avg");
355
356 r->gbphy_firmware_latency_min =
357 read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_min");
358 r->gbphy_firmware_latency_max =
359 read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_max");
360 r->gbphy_firmware_latency_avg =
361 read_sysfs_float(d->sysfs_entry, "gbphy_firmware_latency_avg");
362
363 r->request_jitter = r->request_max - r->request_min;
364 r->latency_jitter = r->latency_max - r->latency_min;
365 r->throughput_jitter = r->throughput_max - r->throughput_min;
366 r->apbridge_unipro_latency_jitter =
367 r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
368 r->gbphy_firmware_latency_jitter =
369 r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
370
371 }
372
373
374 if (t->aggregate_output) {
375 r = &t->aggregate_results;
376
377 r->request_min = get_request_min_aggregate(t);
378 r->request_max = get_request_max_aggregate(t);
379 r->request_avg = get_request_avg_aggregate(t);
380
381 r->latency_min = get_latency_min_aggregate(t);
382 r->latency_max = get_latency_max_aggregate(t);
383 r->latency_avg = get_latency_avg_aggregate(t);
384
385 r->throughput_min = get_throughput_min_aggregate(t);
386 r->throughput_max = get_throughput_max_aggregate(t);
387 r->throughput_avg = get_throughput_avg_aggregate(t);
388
389 r->apbridge_unipro_latency_min =
390 get_apbridge_unipro_latency_min_aggregate(t);
391 r->apbridge_unipro_latency_max =
392 get_apbridge_unipro_latency_max_aggregate(t);
393 r->apbridge_unipro_latency_avg =
394 get_apbridge_unipro_latency_avg_aggregate(t);
395
396 r->gbphy_firmware_latency_min =
397 get_gbphy_firmware_latency_min_aggregate(t);
398 r->gbphy_firmware_latency_max =
399 get_gbphy_firmware_latency_max_aggregate(t);
400 r->gbphy_firmware_latency_avg =
401 get_gbphy_firmware_latency_avg_aggregate(t);
402
403 r->request_jitter = r->request_max - r->request_min;
404 r->latency_jitter = r->latency_max - r->latency_min;
405 r->throughput_jitter = r->throughput_max - r->throughput_min;
406 r->apbridge_unipro_latency_jitter =
407 r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
408 r->gbphy_firmware_latency_jitter =
409 r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
410
411 }
412
413 return 0;
414}
415
416void log_csv_error(int len, int err)
417{
418 fprintf(stderr, "unable to write %d bytes to csv %s\n", len,
419 strerror(err));
420}
421
422int format_output(struct loopback_test *t,
423 struct loopback_results *r,
424 const char *dev_name,
425 char *buf, int buf_len,
426 struct tm *tm)
427{
428 int len = 0;
429
430 memset(buf, 0x00, buf_len);
431 len = snprintf(buf, buf_len, "%u-%u-%u %u:%u:%u",
432 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
433 tm->tm_hour, tm->tm_min, tm->tm_sec);
434
435 if (t->porcelain) {
436 len += snprintf(&buf[len], buf_len - len,
437 "\n test:\t\t\t%s\n path:\t\t\t%s\n size:\t\t\t%u\n iterations:\t\t%u\n errors:\t\t%u\n async:\t\t\t%s\n",
438 t->test_name,
439 dev_name,
440 t->size,
441 t->iteration_max,
442 r->error,
443 t->use_async ? "Enabled" : "Disabled");
444
445 len += snprintf(&buf[len], buf_len - len,
446 " requests per-sec:\tmin=%u, max=%u, average=%f, jitter=%u\n",
447 r->request_min,
448 r->request_max,
449 r->request_avg,
450 r->request_jitter);
451
452 len += snprintf(&buf[len], buf_len - len,
453 " ap-throughput B/s:\tmin=%u max=%u average=%f jitter=%u\n",
454 r->throughput_min,
455 r->throughput_max,
456 r->throughput_avg,
457 r->throughput_jitter);
458 len += snprintf(&buf[len], buf_len - len,
459 " ap-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
460 r->latency_min,
461 r->latency_max,
462 r->latency_avg,
463 r->latency_jitter);
464 len += snprintf(&buf[len], buf_len - len,
465 " apbridge-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
466 r->apbridge_unipro_latency_min,
467 r->apbridge_unipro_latency_max,
468 r->apbridge_unipro_latency_avg,
469 r->apbridge_unipro_latency_jitter);
470
471 len += snprintf(&buf[len], buf_len - len,
472 " gbphy-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
473 r->gbphy_firmware_latency_min,
474 r->gbphy_firmware_latency_max,
475 r->gbphy_firmware_latency_avg,
476 r->gbphy_firmware_latency_jitter);
477
478 } else {
479 len += snprintf(&buf[len], buf_len - len, ",%s,%s,%u,%u,%u",
480 t->test_name, dev_name, t->size, t->iteration_max,
481 r->error);
482
483 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
484 r->request_min,
485 r->request_max,
486 r->request_avg,
487 r->request_jitter);
488
489 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
490 r->latency_min,
491 r->latency_max,
492 r->latency_avg,
493 r->latency_jitter);
494
495 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
496 r->throughput_min,
497 r->throughput_max,
498 r->throughput_avg,
499 r->throughput_jitter);
500
501 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
502 r->apbridge_unipro_latency_min,
503 r->apbridge_unipro_latency_max,
504 r->apbridge_unipro_latency_avg,
505 r->apbridge_unipro_latency_jitter);
506
507 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
508 r->gbphy_firmware_latency_min,
509 r->gbphy_firmware_latency_max,
510 r->gbphy_firmware_latency_avg,
511 r->gbphy_firmware_latency_jitter);
512 }
513
514 printf("\n%s\n", buf);
515
516 return len;
517}
518
519static int log_results(struct loopback_test *t)
520{
521 int fd, i, len, ret;
522 struct tm tm;
523 time_t local_time;
524 char file_name[MAX_SYSFS_PATH];
525 char data[CSV_MAX_LINE];
526
527 local_time = time(NULL);
528 tm = *localtime(&local_time);
529
530
531
532
533
534
535
536 if (t->file_output && !t->porcelain) {
537 snprintf(file_name, sizeof(file_name), "%s_%d_%d.csv",
538 t->test_name, t->size, t->iteration_max);
539
540 fd = open(file_name, O_WRONLY | O_CREAT | O_APPEND, 0644);
541 if (fd < 0) {
542 fprintf(stderr, "unable to open %s for appendation\n", file_name);
543 abort();
544 }
545
546 }
547 for (i = 0; i < t->device_count; i++) {
548 if (!device_enabled(t, i))
549 continue;
550
551 len = format_output(t, &t->devices[i].results,
552 t->devices[i].name,
553 data, sizeof(data), &tm);
554 if (t->file_output && !t->porcelain) {
555 ret = write(fd, data, len);
556 if (ret == -1)
557 fprintf(stderr, "unable to write %d bytes to csv.\n", len);
558 }
559
560 }
561
562
563 if (t->aggregate_output) {
564 len = format_output(t, &t->aggregate_results, "aggregate",
565 data, sizeof(data), &tm);
566 if (t->file_output && !t->porcelain) {
567 ret = write(fd, data, len);
568 if (ret == -1)
569 fprintf(stderr, "unable to write %d bytes to csv.\n", len);
570 }
571 }
572
573 if (t->file_output && !t->porcelain)
574 close(fd);
575
576 return 0;
577}
578
579int is_loopback_device(const char *path, const char *node)
580{
581 char file[MAX_SYSFS_PATH];
582
583 snprintf(file, MAX_SYSFS_PATH, "%s%s/iteration_count", path, node);
584 if (access(file, F_OK) == 0)
585 return 1;
586 return 0;
587}
588
589int find_loopback_devices(struct loopback_test *t)
590{
591 struct dirent **namelist;
592 int i, n, ret;
593 unsigned int dev_id;
594 struct loopback_device *d;
595
596 n = scandir(t->sysfs_prefix, &namelist, NULL, alphasort);
597 if (n < 0) {
598 perror("scandir");
599 ret = -ENODEV;
600 goto baddir;
601 }
602
603
604 if (n <= 2) {
605 ret = -ENOMEM;
606 goto done;
607 }
608
609 for (i = 0; i < n; i++) {
610 ret = sscanf(namelist[i]->d_name, "gb_loopback%u", &dev_id);
611 if (ret != 1)
612 continue;
613
614 if (!is_loopback_device(t->sysfs_prefix, namelist[i]->d_name))
615 continue;
616
617 if (t->device_count == MAX_NUM_DEVICES) {
618 fprintf(stderr, "max number of devices reached!\n");
619 break;
620 }
621
622 d = &t->devices[t->device_count++];
623 snprintf(d->name, MAX_STR_LEN, "gb_loopback%u", dev_id);
624
625 snprintf(d->sysfs_entry, MAX_SYSFS_PATH, "%s%s/",
626 t->sysfs_prefix, d->name);
627
628 snprintf(d->debugfs_entry, MAX_SYSFS_PATH, "%sraw_latency_%s",
629 t->debugfs_prefix, d->name);
630
631 if (t->debug)
632 printf("add %s %s\n", d->sysfs_entry, d->debugfs_entry);
633 }
634
635 ret = 0;
636done:
637 for (i = 0; i < n; i++)
638 free(namelist[i]);
639 free(namelist);
640baddir:
641 return ret;
642}
643
644static int open_poll_files(struct loopback_test *t)
645{
646 struct loopback_device *dev;
647 char buf[MAX_STR_LEN];
648 char dummy;
649 int fds_idx = 0;
650 int i;
651
652 for (i = 0; i < t->device_count; i++) {
653 dev = &t->devices[i];
654
655 if (!device_enabled(t, i))
656 continue;
657
658 snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
659 t->fds[fds_idx].fd = open(buf, O_RDONLY);
660 if (t->fds[fds_idx].fd < 0) {
661 fprintf(stderr, "Error opening poll file!\n");
662 goto err;
663 }
664 read(t->fds[fds_idx].fd, &dummy, 1);
665 t->fds[fds_idx].events = POLLERR|POLLPRI;
666 t->fds[fds_idx].revents = 0;
667 fds_idx++;
668 }
669
670 t->poll_count = fds_idx;
671
672 return 0;
673
674err:
675 for (i = 0; i < fds_idx; i++)
676 close(t->fds[i].fd);
677
678 return -1;
679}
680
681static int close_poll_files(struct loopback_test *t)
682{
683 int i;
684 for (i = 0; i < t->poll_count; i++)
685 close(t->fds[i].fd);
686
687 return 0;
688}
689static int is_complete(struct loopback_test *t)
690{
691 int iteration_count;
692 int i;
693
694 for (i = 0; i < t->device_count; i++) {
695 if (!device_enabled(t, i))
696 continue;
697
698 iteration_count = read_sysfs_int(t->devices[i].sysfs_entry,
699 "iteration_count");
700
701
702 if (iteration_count != t->iteration_max)
703 return 0;
704 }
705
706 return 1;
707}
708
709static void stop_tests(struct loopback_test *t)
710{
711 int i;
712
713 for (i = 0; i < t->device_count; i++) {
714 if (!device_enabled(t, i))
715 continue;
716 write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
717 }
718}
719
720static void handler(int sig) { }
721
722static int wait_for_complete(struct loopback_test *t)
723{
724 int number_of_events = 0;
725 char dummy;
726 int ret;
727 int i;
728 struct timespec *ts = NULL;
729 struct sigaction sa;
730 sigset_t mask_old, mask;
731
732 sigemptyset(&mask);
733 sigemptyset(&mask_old);
734 sigaddset(&mask, SIGINT);
735 sigprocmask(SIG_BLOCK, &mask, &mask_old);
736
737 sa.sa_handler = handler;
738 sa.sa_flags = 0;
739 sigemptyset(&sa.sa_mask);
740 if (sigaction(SIGINT, &sa, NULL) == -1) {
741 fprintf(stderr, "sigaction error\n");
742 return -1;
743 }
744
745 if (t->poll_timeout.tv_sec != 0)
746 ts = &t->poll_timeout;
747
748 while (1) {
749
750 ret = ppoll(t->fds, t->poll_count, ts, &mask_old);
751 if (ret <= 0) {
752 stop_tests(t);
753 fprintf(stderr, "Poll exit with errno %d\n", errno);
754 return -1;
755 }
756
757 for (i = 0; i < t->poll_count; i++) {
758 if (t->fds[i].revents & POLLPRI) {
759
760 read(t->fds[i].fd, &dummy, 1);
761 number_of_events++;
762 }
763 }
764
765 if (number_of_events == t->poll_count)
766 break;
767 }
768
769 if (!is_complete(t)) {
770 fprintf(stderr, "Iteration count did not finish!\n");
771 return -1;
772 }
773
774 return 0;
775}
776
777static void prepare_devices(struct loopback_test *t)
778{
779 int i;
780
781
782
783
784
785 for (i = 0; i < t->device_count; i++)
786 if (t->stop_all || device_enabled(t, i))
787 write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
788
789
790 for (i = 0; i < t->device_count; i++) {
791 if (!device_enabled(t, i))
792 continue;
793
794 write_sysfs_val(t->devices[i].sysfs_entry, "us_wait",
795 t->us_wait);
796
797
798 write_sysfs_val(t->devices[i].sysfs_entry, "size", t->size);
799
800
801 write_sysfs_val(t->devices[i].sysfs_entry, "iteration_max",
802 t->iteration_max);
803
804 if (t->use_async) {
805 write_sysfs_val(t->devices[i].sysfs_entry, "async", 1);
806 write_sysfs_val(t->devices[i].sysfs_entry,
807 "timeout", t->async_timeout);
808 write_sysfs_val(t->devices[i].sysfs_entry,
809 "outstanding_operations_max",
810 t->async_outstanding_operations);
811 } else
812 write_sysfs_val(t->devices[i].sysfs_entry, "async", 0);
813 }
814}
815
816static int start(struct loopback_test *t)
817{
818 int i;
819
820
821 for (i = 0; i < t->device_count; i++) {
822 if (!device_enabled(t, i))
823 continue;
824
825 write_sysfs_val(t->devices[i].sysfs_entry, "type", t->test_id);
826 }
827
828 return 0;
829}
830
831
832void loopback_run(struct loopback_test *t)
833{
834 int i;
835 int ret;
836
837 for (i = 0; dict[i].name != NULL; i++) {
838 if (strstr(dict[i].name, t->test_name))
839 t->test_id = dict[i].type;
840 }
841 if (!t->test_id) {
842 fprintf(stderr, "invalid test %s\n", t->test_name);
843 usage();
844 return;
845 }
846
847 prepare_devices(t);
848
849 ret = open_poll_files(t);
850 if (ret)
851 goto err;
852
853 start(t);
854
855 ret = wait_for_complete(t);
856 close_poll_files(t);
857 if (ret)
858 goto err;
859
860
861 get_results(t);
862
863 log_results(t);
864
865 return;
866
867err:
868 printf("Error running test\n");
869 return;
870}
871
872static int sanity_check(struct loopback_test *t)
873{
874 int i;
875
876 if (t->device_count == 0) {
877 fprintf(stderr, "No loopback devices found\n");
878 return -1;
879 }
880
881 for (i = 0; i < MAX_NUM_DEVICES; i++) {
882 if (!device_enabled(t, i))
883 continue;
884
885 if (t->mask && !strcmp(t->devices[i].name, "")) {
886 fprintf(stderr, "Bad device mask %x\n", (1 << i));
887 return -1;
888 }
889
890 }
891
892
893 return 0;
894}
895
896int main(int argc, char *argv[])
897{
898 int o, ret;
899 char *sysfs_prefix = "/sys/class/gb_loopback/";
900 char *debugfs_prefix = "/sys/kernel/debug/gb_loopback/";
901
902 memset(&t, 0, sizeof(t));
903
904 while ((o = getopt(argc, argv,
905 "t:s:i:S:D:m:v::d::r::p::a::l::x::o:O:c:w:z::f::")) != -1) {
906 switch (o) {
907 case 't':
908 snprintf(t.test_name, MAX_STR_LEN, "%s", optarg);
909 break;
910 case 's':
911 t.size = atoi(optarg);
912 break;
913 case 'i':
914 t.iteration_max = atoi(optarg);
915 break;
916 case 'S':
917 snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
918 break;
919 case 'D':
920 snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
921 break;
922 case 'm':
923 t.mask = atol(optarg);
924 break;
925 case 'v':
926 t.verbose = 1;
927 break;
928 case 'd':
929 t.debug = 1;
930 break;
931 case 'r':
932 t.raw_data_dump = 1;
933 break;
934 case 'p':
935 t.porcelain = 1;
936 break;
937 case 'a':
938 t.aggregate_output = 1;
939 break;
940 case 'l':
941 t.list_devices = 1;
942 break;
943 case 'x':
944 t.use_async = 1;
945 break;
946 case 'o':
947 t.async_timeout = atoi(optarg);
948 break;
949 case 'O':
950 t.poll_timeout.tv_sec = atoi(optarg);
951 break;
952 case 'c':
953 t.async_outstanding_operations = atoi(optarg);
954 break;
955 case 'w':
956 t.us_wait = atoi(optarg);
957 break;
958 case 'z':
959 t.file_output = 1;
960 break;
961 case 'f':
962 t.stop_all = 1;
963 break;
964 default:
965 usage();
966 return -EINVAL;
967 }
968 }
969
970 if (!strcmp(t.sysfs_prefix, ""))
971 snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", sysfs_prefix);
972
973 if (!strcmp(t.debugfs_prefix, ""))
974 snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", debugfs_prefix);
975
976 ret = find_loopback_devices(&t);
977 if (ret)
978 return ret;
979 ret = sanity_check(&t);
980 if (ret)
981 return ret;
982
983 if (t.list_devices) {
984 show_loopback_devices(&t);
985 return 0;
986 }
987
988 if (t.test_name[0] == '\0' || t.iteration_max == 0)
989 usage();
990
991 if (t.async_timeout == 0)
992 t.async_timeout = DEFAULT_ASYNC_TIMEOUT;
993
994 loopback_run(&t);
995
996 return 0;
997}
998
