forked from richardcochran/linuxptp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
phc2sys.c
1494 lines (1325 loc) · 34.7 KB
/
phc2sys.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/**
* @file phc2sys.c
* @brief Utility program to synchronize two clocks via a PPS.
* @note Copyright (C) 2012 Richard Cochran <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <float.h>
#include <inttypes.h>
#include <limits.h>
#include <net/if.h>
#include <poll.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/pps.h>
#include <linux/ptp_clock.h>
#include "clockadj.h"
#include "clockcheck.h"
#include "ds.h"
#include "fsm.h"
#include "missing.h"
#include "notification.h"
#include "ntpshm.h"
#include "phc.h"
#include "pi.h"
#include "pmc_common.h"
#include "print.h"
#include "servo.h"
#include "sk.h"
#include "stats.h"
#include "sysoff.h"
#include "tlv.h"
#include "uds.h"
#include "util.h"
#include "version.h"
#define KP 0.7
#define KI 0.3
#define NS_PER_SEC 1000000000LL
#define PHC_PPS_OFFSET_LIMIT 10000000
#define PMC_UPDATE_INTERVAL (60 * NS_PER_SEC)
#define PMC_SUBSCRIBE_DURATION 180 /* 3 minutes */
/* Note that PMC_SUBSCRIBE_DURATION has to be longer than
* PMC_UPDATE_INTERVAL otherwise subscription will time out before it is
* renewed.
*/
struct clock {
LIST_ENTRY(clock) list;
clockid_t clkid;
int sysoff_supported;
int is_utc;
int dest_only;
int state;
int new_state;
int sync_offset;
int leap_set;
int utc_offset_set;
struct servo *servo;
enum servo_state servo_state;
char *device;
const char *source_label;
struct stats *offset_stats;
struct stats *freq_stats;
struct stats *delay_stats;
struct clockcheck *sanity_check;
};
struct port {
LIST_ENTRY(port) list;
unsigned int number;
int state;
struct clock *clock;
};
struct node {
unsigned int stats_max_count;
int sanity_freq_limit;
enum servo_type servo_type;
int phc_readings;
double phc_interval;
int sync_offset;
int forced_sync_offset;
int utc_offset_traceable;
int leap;
int kernel_leap;
struct pmc *pmc;
int pmc_ds_requested;
uint64_t pmc_last_update;
int state_changed;
int clock_identity_set;
struct ClockIdentity clock_identity;
LIST_HEAD(port_head, port) ports;
LIST_HEAD(clock_head, clock) clocks;
struct clock *master;
};
static struct config *phc2sys_config;
static int update_pmc(struct node *node, int subscribe);
static int clock_handle_leap(struct node *node, struct clock *clock,
int64_t offset, uint64_t ts);
static int run_pmc_get_utc_offset(struct node *node, int timeout);
static void run_pmc_events(struct node *node);
static clockid_t clock_open(char *device)
{
struct sk_ts_info ts_info;
char phc_device[16];
int clkid;
/* check if device is CLOCK_REALTIME */
if (!strcasecmp(device, "CLOCK_REALTIME"))
return CLOCK_REALTIME;
/* check if device is valid phc device */
clkid = phc_open(device);
if (clkid != CLOCK_INVALID)
return clkid;
/* check if device is a valid ethernet device */
if (sk_get_ts_info(device, &ts_info) || !ts_info.valid) {
fprintf(stderr, "unknown clock %s: %m\n", device);
return CLOCK_INVALID;
}
if (ts_info.phc_index < 0) {
fprintf(stderr, "interface %s does not have a PHC\n", device);
return CLOCK_INVALID;
}
sprintf(phc_device, "/dev/ptp%d", ts_info.phc_index);
clkid = phc_open(phc_device);
if (clkid == CLOCK_INVALID)
fprintf(stderr, "cannot open %s: %m\n", device);
return clkid;
}
static struct clock *clock_add(struct node *node, char *device)
{
struct clock *c;
clockid_t clkid = CLOCK_INVALID;
int max_ppb;
double ppb;
if (device) {
clkid = clock_open(device);
if (clkid == CLOCK_INVALID)
return NULL;
}
c = calloc(1, sizeof(*c));
if (!c) {
pr_err("failed to allocate memory for a clock");
return NULL;
}
c->clkid = clkid;
c->servo_state = SERVO_UNLOCKED;
c->device = strdup(device);
if (c->clkid == CLOCK_REALTIME) {
c->source_label = "sys";
c->is_utc = 1;
} else {
c->source_label = "phc";
}
if (node->stats_max_count > 0) {
c->offset_stats = stats_create();
c->freq_stats = stats_create();
c->delay_stats = stats_create();
if (!c->offset_stats ||
!c->freq_stats ||
!c->delay_stats) {
pr_err("failed to create stats");
return NULL;
}
}
if (node->sanity_freq_limit) {
c->sanity_check = clockcheck_create(node->sanity_freq_limit);
if (!c->sanity_check) {
pr_err("failed to create clock check");
return NULL;
}
}
clockadj_init(c->clkid);
ppb = clockadj_get_freq(c->clkid);
/* The reading may silently fail and return 0, reset the frequency to
make sure ppb is the actual frequency of the clock. */
clockadj_set_freq(c->clkid, ppb);
if (c->clkid == CLOCK_REALTIME) {
sysclk_set_leap(0);
max_ppb = sysclk_max_freq();
} else {
max_ppb = phc_max_adj(c->clkid);
if (!max_ppb) {
pr_err("clock is not adjustable");
return NULL;
}
}
c->servo = servo_create(phc2sys_config, node->servo_type,
-ppb, max_ppb, 0);
servo_sync_interval(c->servo, node->phc_interval);
if (clkid != CLOCK_REALTIME)
c->sysoff_supported = (SYSOFF_SUPPORTED ==
sysoff_probe(CLOCKID_TO_FD(clkid),
node->phc_readings));
LIST_INSERT_HEAD(&node->clocks, c, list);
return c;
}
static struct port *port_get(struct node *node, unsigned int number)
{
struct port *p;
LIST_FOREACH(p, &node->ports, list) {
if (p->number == number)
return p;
}
return NULL;
}
static struct port *port_add(struct node *node, unsigned int number,
char *device)
{
struct port *p;
struct clock *c = NULL, *tmp;
p = port_get(node, number);
if (p)
return p;
/* port is a new one, look whether we have the device already on
* a different port */
LIST_FOREACH(tmp, &node->clocks, list) {
if (!strcmp(tmp->device, device)) {
c = tmp;
break;
}
}
if (!c) {
c = clock_add(node, device);
if (!c)
return NULL;
}
p = malloc(sizeof(*p));
if (!p) {
pr_err("failed to allocate memory for a port");
return NULL;
}
p->number = number;
p->clock = c;
LIST_INSERT_HEAD(&node->ports, p, list);
return p;
}
static void clock_reinit(struct clock *clock)
{
servo_reset(clock->servo);
clock->servo_state = SERVO_UNLOCKED;
if (clock->offset_stats) {
stats_reset(clock->offset_stats);
stats_reset(clock->freq_stats);
stats_reset(clock->delay_stats);
}
}
static void reconfigure(struct node *node)
{
struct clock *c, *rt = NULL, *src = NULL, *last = NULL;
int src_cnt = 0, dst_cnt = 0;
pr_info("reconfiguring after port state change");
node->state_changed = 0;
LIST_FOREACH(c, &node->clocks, list) {
if (c->clkid == CLOCK_REALTIME) {
rt = c;
continue;
}
if (c->new_state) {
if (c->new_state == PS_MASTER)
clock_reinit(c);
c->state = c->new_state;
c->new_state = 0;
}
switch (c->state) {
case PS_FAULTY:
case PS_DISABLED:
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_PASSIVE:
pr_info("selecting %s for synchronization", c->device);
dst_cnt++;
break;
case PS_UNCALIBRATED:
src_cnt++;
break;
case PS_SLAVE:
src = c;
src_cnt++;
break;
}
last = c;
}
if (dst_cnt > 1 && !src) {
if (!rt || rt->dest_only) {
node->master = last;
/* Reset to original state in next reconfiguration. */
node->master->new_state = node->master->state;
node->master->state = PS_SLAVE;
if (rt)
rt->state = PS_SLAVE;
pr_info("no source, selecting %s as the default clock",
last->device);
return;
}
}
if (src_cnt > 1) {
pr_info("multiple master clocks available, postponing sync...");
node->master = NULL;
return;
}
if (src_cnt > 0 && !src) {
pr_info("master clock not ready, waiting...");
node->master = NULL;
return;
}
if (!src_cnt && !dst_cnt) {
pr_info("no PHC ready, waiting...");
node->master = NULL;
return;
}
if ((!src_cnt && (!rt || rt->dest_only)) ||
(!dst_cnt && !rt)) {
pr_info("nothing to synchronize");
node->master = NULL;
return;
}
if (!src_cnt) {
src = rt;
rt->state = PS_SLAVE;
} else if (rt) {
if (rt->state != PS_MASTER) {
rt->state = PS_MASTER;
clock_reinit(rt);
}
pr_info("selecting %s for synchronization", rt->device);
}
node->master = src;
pr_info("selecting %s as the master clock", src->device);
}
static int read_phc(clockid_t clkid, clockid_t sysclk, int readings,
int64_t *offset, uint64_t *ts, int64_t *delay)
{
struct timespec tdst1, tdst2, tsrc;
int i;
int64_t interval, best_interval = INT64_MAX;
/* Pick the quickest clkid reading. */
for (i = 0; i < readings; i++) {
if (clock_gettime(sysclk, &tdst1) ||
clock_gettime(clkid, &tsrc) ||
clock_gettime(sysclk, &tdst2)) {
pr_err("failed to read clock: %m");
return 0;
}
interval = (tdst2.tv_sec - tdst1.tv_sec) * NS_PER_SEC +
tdst2.tv_nsec - tdst1.tv_nsec;
if (best_interval > interval) {
best_interval = interval;
*offset = (tdst1.tv_sec - tsrc.tv_sec) * NS_PER_SEC +
tdst1.tv_nsec - tsrc.tv_nsec + interval / 2;
*ts = tdst2.tv_sec * NS_PER_SEC + tdst2.tv_nsec;
}
}
*delay = best_interval;
return 1;
}
static int64_t get_sync_offset(struct node *node, struct clock *dst)
{
int direction = node->forced_sync_offset;
if (!direction)
direction = dst->is_utc - node->master->is_utc;
return (int64_t)dst->sync_offset * NS_PER_SEC * direction;
}
static void update_clock_stats(struct clock *clock, unsigned int max_count,
int64_t offset, double freq, int64_t delay)
{
struct stats_result offset_stats, freq_stats, delay_stats;
stats_add_value(clock->offset_stats, offset);
stats_add_value(clock->freq_stats, freq);
if (delay >= 0)
stats_add_value(clock->delay_stats, delay);
if (stats_get_num_values(clock->offset_stats) < max_count)
return;
stats_get_result(clock->offset_stats, &offset_stats);
stats_get_result(clock->freq_stats, &freq_stats);
if (!stats_get_result(clock->delay_stats, &delay_stats)) {
pr_info("rms %4.0f max %4.0f "
"freq %+6.0f +/- %3.0f "
"delay %5.0f +/- %3.0f",
offset_stats.rms, offset_stats.max_abs,
freq_stats.mean, freq_stats.stddev,
delay_stats.mean, delay_stats.stddev);
} else {
pr_info("rms %4.0f max %4.0f "
"freq %+6.0f +/- %3.0f",
offset_stats.rms, offset_stats.max_abs,
freq_stats.mean, freq_stats.stddev);
}
stats_reset(clock->offset_stats);
stats_reset(clock->freq_stats);
stats_reset(clock->delay_stats);
}
static void update_clock(struct node *node, struct clock *clock,
int64_t offset, uint64_t ts, int64_t delay)
{
enum servo_state state;
double ppb;
if (clock_handle_leap(node, clock, offset, ts))
return;
offset += get_sync_offset(node, clock);
if (clock->sanity_check && clockcheck_sample(clock->sanity_check, ts))
servo_reset(clock->servo);
ppb = servo_sample(clock->servo, offset, ts, 1.0, &state);
clock->servo_state = state;
switch (state) {
case SERVO_UNLOCKED:
break;
case SERVO_JUMP:
clockadj_step(clock->clkid, -offset);
if (clock->sanity_check)
clockcheck_step(clock->sanity_check, -offset);
/* Fall through. */
case SERVO_LOCKED:
clockadj_set_freq(clock->clkid, -ppb);
if (clock->clkid == CLOCK_REALTIME)
sysclk_set_sync();
if (clock->sanity_check)
clockcheck_set_freq(clock->sanity_check, -ppb);
break;
}
if (clock->offset_stats) {
update_clock_stats(clock, node->stats_max_count, offset, ppb, delay);
} else {
if (delay >= 0) {
pr_info("%s offset %9" PRId64 " s%d freq %+7.0f "
"delay %6" PRId64,
node->master->source_label, offset, state, ppb, delay);
} else {
pr_info("%s offset %9" PRId64 " s%d freq %+7.0f",
node->master->source_label, offset, state, ppb);
}
}
}
static void enable_pps_output(clockid_t src)
{
int enable = 1;
if (!phc_has_pps(src))
return;
if (ioctl(CLOCKID_TO_FD(src), PTP_ENABLE_PPS, enable) < 0)
pr_warning("failed to enable PPS output");
}
static int read_pps(int fd, int64_t *offset, uint64_t *ts)
{
struct pps_fdata pfd;
pfd.timeout.sec = 10;
pfd.timeout.nsec = 0;
pfd.timeout.flags = ~PPS_TIME_INVALID;
if (ioctl(fd, PPS_FETCH, &pfd)) {
pr_err("failed to fetch PPS: %m");
return 0;
}
*ts = pfd.info.assert_tu.sec * NS_PER_SEC;
*ts += pfd.info.assert_tu.nsec;
*offset = *ts % NS_PER_SEC;
if (*offset > NS_PER_SEC / 2)
*offset -= NS_PER_SEC;
return 1;
}
static int do_pps_loop(struct node *node, struct clock *clock, int fd)
{
int64_t pps_offset, phc_offset, phc_delay;
uint64_t pps_ts, phc_ts;
clockid_t src = node->master->clkid;
node->master->source_label = "pps";
if (src == CLOCK_INVALID) {
/* The sync offset can't be applied with PPS alone. */
node->sync_offset = 0;
} else {
enable_pps_output(node->master->clkid);
}
while (is_running()) {
if (!read_pps(fd, &pps_offset, &pps_ts)) {
continue;
}
/* If a PHC is available, use it to get the whole number
of seconds in the offset and PPS for the rest. */
if (src != CLOCK_INVALID) {
if (!read_phc(src, clock->clkid, node->phc_readings,
&phc_offset, &phc_ts, &phc_delay))
return -1;
/* Convert the time stamp to the PHC time. */
phc_ts -= phc_offset;
/* Check if it is close to the start of the second. */
if (phc_ts % NS_PER_SEC > PHC_PPS_OFFSET_LIMIT) {
pr_warning("PPS is not in sync with PHC"
" (0.%09lld)", phc_ts % NS_PER_SEC);
continue;
}
phc_ts = phc_ts / NS_PER_SEC * NS_PER_SEC;
pps_offset = pps_ts - phc_ts;
}
if (update_pmc(node, 0) < 0)
continue;
update_clock(node, clock, pps_offset, pps_ts, -1);
}
close(fd);
return 0;
}
static int update_needed(struct clock *c)
{
switch (c->state) {
case PS_FAULTY:
case PS_DISABLED:
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_PASSIVE:
return 1;
case PS_UNCALIBRATED:
case PS_SLAVE:
break;
}
return 0;
}
static int do_loop(struct node *node, int subscriptions)
{
struct timespec interval;
struct clock *clock;
uint64_t ts;
int64_t offset, delay;
interval.tv_sec = node->phc_interval;
interval.tv_nsec = (node->phc_interval - interval.tv_sec) * 1e9;
while (is_running()) {
clock_nanosleep(CLOCK_MONOTONIC, 0, &interval, NULL);
if (update_pmc(node, subscriptions) < 0)
continue;
if (subscriptions) {
run_pmc_events(node);
if (node->state_changed) {
/* force getting offset, as it may have
* changed after the port state change */
if (run_pmc_get_utc_offset(node, 1000) <= 0) {
pr_err("failed to get UTC offset");
continue;
}
reconfigure(node);
}
}
if (!node->master)
continue;
LIST_FOREACH(clock, &node->clocks, list) {
if (!update_needed(clock))
continue;
if (clock->clkid == CLOCK_REALTIME &&
node->master->sysoff_supported) {
/* use sysoff */
if (sysoff_measure(CLOCKID_TO_FD(node->master->clkid),
node->phc_readings,
&offset, &ts, &delay))
return -1;
} else {
/* use phc */
if (!read_phc(node->master->clkid, clock->clkid,
node->phc_readings,
&offset, &ts, &delay))
continue;
}
update_clock(node, clock, offset, ts, delay);
}
}
return 0;
}
static int check_clock_identity(struct node *node, struct ptp_message *msg)
{
if (!node->clock_identity_set)
return 1;
return !memcmp(&node->clock_identity,
&msg->header.sourcePortIdentity.clockIdentity,
sizeof(struct ClockIdentity));
}
static int is_msg_mgt(struct ptp_message *msg)
{
struct TLV *tlv;
if (msg_type(msg) != MANAGEMENT)
return 0;
if (management_action(msg) != RESPONSE)
return 0;
if (msg->tlv_count != 1)
return 0;
tlv = (struct TLV *) msg->management.suffix;
if (tlv->type == TLV_MANAGEMENT)
return 1;
if (tlv->type == TLV_MANAGEMENT_ERROR_STATUS)
return -1;
return 0;
}
static int get_mgt_id(struct ptp_message *msg)
{
struct management_tlv *mgt = (struct management_tlv *) msg->management.suffix;
return mgt->id;
}
static void *get_mgt_data(struct ptp_message *msg)
{
struct management_tlv *mgt = (struct management_tlv *) msg->management.suffix;
return mgt->data;
}
static int get_mgt_err_id(struct ptp_message *msg)
{
struct management_error_status *mgt;
mgt = (struct management_error_status *)msg->management.suffix;
return mgt->id;
}
static int normalize_state(int state)
{
if (state != PS_MASTER && state != PS_SLAVE &&
state != PS_PRE_MASTER && state != PS_UNCALIBRATED) {
/* treat any other state as "not a master nor a slave" */
state = PS_DISABLED;
}
return state;
}
static int clock_compute_state(struct node *node, struct clock *clock)
{
struct port *p;
int state = PS_DISABLED;
LIST_FOREACH(p, &node->ports, list) {
if (p->clock != clock)
continue;
/* PS_SLAVE takes the highest precedence, PS_UNCALIBRATED
* after that, PS_MASTER is third, PS_PRE_MASTER fourth and
* all of that overrides PS_DISABLED, which corresponds
* nicely with the numerical values */
if (p->state > state)
state = p->state;
}
return state;
}
static int recv_subscribed(struct node *node, struct ptp_message *msg,
int excluded)
{
int mgt_id, state;
struct portDS *pds;
struct port *port;
struct clock *clock;
mgt_id = get_mgt_id(msg);
if (mgt_id == excluded)
return 0;
switch (mgt_id) {
case TLV_PORT_DATA_SET:
pds = get_mgt_data(msg);
port = port_get(node, pds->portIdentity.portNumber);
if (!port) {
pr_info("received data for unknown port %s",
pid2str(&pds->portIdentity));
return 1;
}
state = normalize_state(pds->portState);
if (port->state != state) {
pr_info("port %s changed state",
pid2str(&pds->portIdentity));
port->state = state;
clock = port->clock;
state = clock_compute_state(node, clock);
if (clock->state != state) {
clock->new_state = state;
node->state_changed = 1;
}
}
return 1;
}
return 0;
}
static void send_subscription(struct node *node)
{
struct subscribe_events_np sen;
memset(&sen, 0, sizeof(sen));
sen.duration = PMC_SUBSCRIBE_DURATION;
sen.bitmask[0] = 1 << NOTIFY_PORT_STATE;
pmc_send_set_action(node->pmc, TLV_SUBSCRIBE_EVENTS_NP, &sen, sizeof(sen));
}
static int init_pmc(struct config *cfg, struct node *node, int domain_number)
{
char uds_local[MAX_IFNAME_SIZE + 1];
snprintf(uds_local, sizeof(uds_local), "/var/run/phc2sys.%d",
getpid());
node->pmc = pmc_create(cfg, TRANS_UDS, uds_local, 0, domain_number, 0, 1);
if (!node->pmc) {
pr_err("failed to create pmc");
return -1;
}
return 0;
}
/* Return values:
* 1: success
* 0: timeout
* -1: error reported by the other side
* -2: local error, fatal
*/
static int run_pmc(struct node *node, int timeout, int ds_id,
struct ptp_message **msg)
{
#define N_FD 1
struct pollfd pollfd[N_FD];
int cnt, res;
while (1) {
pollfd[0].fd = pmc_get_transport_fd(node->pmc);
pollfd[0].events = POLLIN|POLLPRI;
if (!node->pmc_ds_requested && ds_id >= 0)
pollfd[0].events |= POLLOUT;
cnt = poll(pollfd, N_FD, timeout);
if (cnt < 0) {
pr_err("poll failed");
return -2;
}
if (!cnt) {
/* Request the data set again in the next run. */
node->pmc_ds_requested = 0;
return 0;
}
/* Send a new request if there are no pending messages. */
if ((pollfd[0].revents & POLLOUT) &&
!(pollfd[0].revents & (POLLIN|POLLPRI))) {
switch (ds_id) {
case TLV_SUBSCRIBE_EVENTS_NP:
send_subscription(node);
break;
default:
pmc_send_get_action(node->pmc, ds_id);
break;
}
node->pmc_ds_requested = 1;
}
if (!(pollfd[0].revents & (POLLIN|POLLPRI)))
continue;
*msg = pmc_recv(node->pmc);
if (!*msg)
continue;
if (!check_clock_identity(node, *msg)) {
msg_put(*msg);
*msg = NULL;
continue;
}
res = is_msg_mgt(*msg);
if (res < 0 && get_mgt_err_id(*msg) == ds_id) {
node->pmc_ds_requested = 0;
return -1;
}
if (res <= 0 || recv_subscribed(node, *msg, ds_id) ||
get_mgt_id(*msg) != ds_id) {
msg_put(*msg);
*msg = NULL;
continue;
}
node->pmc_ds_requested = 0;
return 1;
}
}
static int run_pmc_wait_sync(struct node *node, int timeout)
{
struct ptp_message *msg;
int res;
void *data;
Enumeration8 portState;
while (1) {
res = run_pmc(node, timeout, TLV_PORT_DATA_SET, &msg);
if (res <= 0)
return res;
data = get_mgt_data(msg);
portState = ((struct portDS *)data)->portState;
msg_put(msg);
switch (portState) {
case PS_MASTER:
case PS_SLAVE:
return 1;
}
/* try to get more data sets (for other ports) */
node->pmc_ds_requested = 1;
}
}
static int run_pmc_get_utc_offset(struct node *node, int timeout)
{
struct ptp_message *msg;
int res;
struct timePropertiesDS *tds;
res = run_pmc(node, timeout, TLV_TIME_PROPERTIES_DATA_SET, &msg);
if (res <= 0)
return res;
tds = (struct timePropertiesDS *)get_mgt_data(msg);
if (tds->flags & PTP_TIMESCALE) {
node->sync_offset = tds->currentUtcOffset;
if (tds->flags & LEAP_61)
node->leap = 1;
else if (tds->flags & LEAP_59)
node->leap = -1;
else
node->leap = 0;
node->utc_offset_traceable = tds->flags & UTC_OFF_VALID &&
tds->flags & TIME_TRACEABLE;
} else {
node->sync_offset = 0;
node->leap = 0;
node->utc_offset_traceable = 0;
}
msg_put(msg);
return 1;
}
static int run_pmc_get_number_ports(struct node *node, int timeout)
{
struct ptp_message *msg;
int res;
struct defaultDS *dds;
res = run_pmc(node, timeout, TLV_DEFAULT_DATA_SET, &msg);
if (res <= 0)
return res;
dds = (struct defaultDS *)get_mgt_data(msg);
res = dds->numberPorts;
msg_put(msg);
return res;
}
static int run_pmc_subscribe(struct node *node, int timeout)
{
struct ptp_message *msg;
int res;
res = run_pmc(node, timeout, TLV_SUBSCRIBE_EVENTS_NP, &msg);
if (res <= 0)
return res;
msg_put(msg);
return 1;
}
static void run_pmc_events(struct node *node)
{
struct ptp_message *msg;
run_pmc(node, 0, -1, &msg);
}
static int run_pmc_port_properties(struct node *node, int timeout,
unsigned int port,
int *state, int *tstamping, char *iface)
{
struct ptp_message *msg;
int res, len;
struct port_properties_np *ppn;
pmc_target_port(node->pmc, port);
while (1) {
res = run_pmc(node, timeout, TLV_PORT_PROPERTIES_NP, &msg);
if (res <= 0)
goto out;
ppn = get_mgt_data(msg);
if (ppn->portIdentity.portNumber != port) {
msg_put(msg);
continue;
}
*state = ppn->port_state;
*tstamping = ppn->timestamping;
len = ppn->interface.length;
if (len > IFNAMSIZ - 1)
len = IFNAMSIZ - 1;
memcpy(iface, ppn->interface.text, len);
iface[len] = '\0';
msg_put(msg);
res = 1;
break;
}
out:
pmc_target_all(node->pmc);
return res;
}
static int run_pmc_clock_identity(struct node *node, int timeout)