forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathregion.c
1260 lines (1053 loc) · 31.3 KB
/
region.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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
*/
#include "devl_internal.h"
struct devlink_region {
struct devlink *devlink;
struct devlink_port *port;
struct list_head list;
union {
const struct devlink_region_ops *ops;
const struct devlink_port_region_ops *port_ops;
};
struct mutex snapshot_lock; /* protects snapshot_list,
* max_snapshots and cur_snapshots
* consistency.
*/
struct list_head snapshot_list;
u32 max_snapshots;
u32 cur_snapshots;
u64 size;
};
struct devlink_snapshot {
struct list_head list;
struct devlink_region *region;
u8 *data;
u32 id;
};
static struct devlink_region *
devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
{
struct devlink_region *region;
list_for_each_entry(region, &devlink->region_list, list)
if (!strcmp(region->ops->name, region_name))
return region;
return NULL;
}
static struct devlink_region *
devlink_port_region_get_by_name(struct devlink_port *port,
const char *region_name)
{
struct devlink_region *region;
list_for_each_entry(region, &port->region_list, list)
if (!strcmp(region->ops->name, region_name))
return region;
return NULL;
}
static struct devlink_snapshot *
devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
{
struct devlink_snapshot *snapshot;
list_for_each_entry(snapshot, ®ion->snapshot_list, list)
if (snapshot->id == id)
return snapshot;
return NULL;
}
static int devlink_nl_region_snapshot_id_put(struct sk_buff *msg,
struct devlink *devlink,
struct devlink_snapshot *snapshot)
{
struct nlattr *snap_attr;
int err;
snap_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_REGION_SNAPSHOT);
if (!snap_attr)
return -EINVAL;
err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID, snapshot->id);
if (err)
goto nla_put_failure;
nla_nest_end(msg, snap_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, snap_attr);
return err;
}
static int devlink_nl_region_snapshots_id_put(struct sk_buff *msg,
struct devlink *devlink,
struct devlink_region *region)
{
struct devlink_snapshot *snapshot;
struct nlattr *snapshots_attr;
int err;
snapshots_attr = nla_nest_start_noflag(msg,
DEVLINK_ATTR_REGION_SNAPSHOTS);
if (!snapshots_attr)
return -EINVAL;
list_for_each_entry(snapshot, ®ion->snapshot_list, list) {
err = devlink_nl_region_snapshot_id_put(msg, devlink, snapshot);
if (err)
goto nla_put_failure;
}
nla_nest_end(msg, snapshots_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, snapshots_attr);
return err;
}
static int devlink_nl_region_fill(struct sk_buff *msg, struct devlink *devlink,
enum devlink_command cmd, u32 portid,
u32 seq, int flags,
struct devlink_region *region)
{
void *hdr;
int err;
hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
if (!hdr)
return -EMSGSIZE;
err = devlink_nl_put_handle(msg, devlink);
if (err)
goto nla_put_failure;
if (region->port) {
err = nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX,
region->port->index);
if (err)
goto nla_put_failure;
}
err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, region->ops->name);
if (err)
goto nla_put_failure;
err = nla_put_u64_64bit(msg, DEVLINK_ATTR_REGION_SIZE,
region->size,
DEVLINK_ATTR_PAD);
if (err)
goto nla_put_failure;
err = nla_put_u32(msg, DEVLINK_ATTR_REGION_MAX_SNAPSHOTS,
region->max_snapshots);
if (err)
goto nla_put_failure;
err = devlink_nl_region_snapshots_id_put(msg, devlink, region);
if (err)
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return err;
}
static struct sk_buff *
devlink_nl_region_notify_build(struct devlink_region *region,
struct devlink_snapshot *snapshot,
enum devlink_command cmd, u32 portid, u32 seq)
{
struct devlink *devlink = region->devlink;
struct sk_buff *msg;
void *hdr;
int err;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return ERR_PTR(-ENOMEM);
hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, 0, cmd);
if (!hdr) {
err = -EMSGSIZE;
goto out_free_msg;
}
err = devlink_nl_put_handle(msg, devlink);
if (err)
goto out_cancel_msg;
if (region->port) {
err = nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX,
region->port->index);
if (err)
goto out_cancel_msg;
}
err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME,
region->ops->name);
if (err)
goto out_cancel_msg;
if (snapshot) {
err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID,
snapshot->id);
if (err)
goto out_cancel_msg;
} else {
err = nla_put_u64_64bit(msg, DEVLINK_ATTR_REGION_SIZE,
region->size, DEVLINK_ATTR_PAD);
if (err)
goto out_cancel_msg;
}
genlmsg_end(msg, hdr);
return msg;
out_cancel_msg:
genlmsg_cancel(msg, hdr);
out_free_msg:
nlmsg_free(msg);
return ERR_PTR(err);
}
static void devlink_nl_region_notify(struct devlink_region *region,
struct devlink_snapshot *snapshot,
enum devlink_command cmd)
{
struct devlink *devlink = region->devlink;
struct sk_buff *msg;
WARN_ON(cmd != DEVLINK_CMD_REGION_NEW && cmd != DEVLINK_CMD_REGION_DEL);
if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
return;
msg = devlink_nl_region_notify_build(region, snapshot, cmd, 0, 0);
if (IS_ERR(msg))
return;
genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
}
void devlink_regions_notify_register(struct devlink *devlink)
{
struct devlink_region *region;
list_for_each_entry(region, &devlink->region_list, list)
devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_NEW);
}
void devlink_regions_notify_unregister(struct devlink *devlink)
{
struct devlink_region *region;
list_for_each_entry_reverse(region, &devlink->region_list, list)
devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_DEL);
}
/**
* __devlink_snapshot_id_increment - Increment number of snapshots using an id
* @devlink: devlink instance
* @id: the snapshot id
*
* Track when a new snapshot begins using an id. Load the count for the
* given id from the snapshot xarray, increment it, and store it back.
*
* Called when a new snapshot is created with the given id.
*
* The id *must* have been previously allocated by
* devlink_region_snapshot_id_get().
*
* Returns 0 on success, or an error on failure.
*/
static int __devlink_snapshot_id_increment(struct devlink *devlink, u32 id)
{
unsigned long count;
void *p;
int err;
xa_lock(&devlink->snapshot_ids);
p = xa_load(&devlink->snapshot_ids, id);
if (WARN_ON(!p)) {
err = -EINVAL;
goto unlock;
}
if (WARN_ON(!xa_is_value(p))) {
err = -EINVAL;
goto unlock;
}
count = xa_to_value(p);
count++;
err = xa_err(__xa_store(&devlink->snapshot_ids, id, xa_mk_value(count),
GFP_ATOMIC));
unlock:
xa_unlock(&devlink->snapshot_ids);
return err;
}
/**
* __devlink_snapshot_id_decrement - Decrease number of snapshots using an id
* @devlink: devlink instance
* @id: the snapshot id
*
* Track when a snapshot is deleted and stops using an id. Load the count
* for the given id from the snapshot xarray, decrement it, and store it
* back.
*
* If the count reaches zero, erase this id from the xarray, freeing it
* up for future re-use by devlink_region_snapshot_id_get().
*
* Called when a snapshot using the given id is deleted, and when the
* initial allocator of the id is finished using it.
*/
static void __devlink_snapshot_id_decrement(struct devlink *devlink, u32 id)
{
unsigned long count;
void *p;
xa_lock(&devlink->snapshot_ids);
p = xa_load(&devlink->snapshot_ids, id);
if (WARN_ON(!p))
goto unlock;
if (WARN_ON(!xa_is_value(p)))
goto unlock;
count = xa_to_value(p);
if (count > 1) {
count--;
__xa_store(&devlink->snapshot_ids, id, xa_mk_value(count),
GFP_ATOMIC);
} else {
/* If this was the last user, we can erase this id */
__xa_erase(&devlink->snapshot_ids, id);
}
unlock:
xa_unlock(&devlink->snapshot_ids);
}
/**
* __devlink_snapshot_id_insert - Insert a specific snapshot ID
* @devlink: devlink instance
* @id: the snapshot id
*
* Mark the given snapshot id as used by inserting a zero value into the
* snapshot xarray.
*
* This must be called while holding the devlink instance lock. Unlike
* devlink_snapshot_id_get, the initial reference count is zero, not one.
* It is expected that the id will immediately be used before
* releasing the devlink instance lock.
*
* Returns zero on success, or an error code if the snapshot id could not
* be inserted.
*/
static int __devlink_snapshot_id_insert(struct devlink *devlink, u32 id)
{
int err;
xa_lock(&devlink->snapshot_ids);
if (xa_load(&devlink->snapshot_ids, id)) {
xa_unlock(&devlink->snapshot_ids);
return -EEXIST;
}
err = xa_err(__xa_store(&devlink->snapshot_ids, id, xa_mk_value(0),
GFP_ATOMIC));
xa_unlock(&devlink->snapshot_ids);
return err;
}
/**
* __devlink_region_snapshot_id_get - get snapshot ID
* @devlink: devlink instance
* @id: storage to return snapshot id
*
* Allocates a new snapshot id. Returns zero on success, or a negative
* error on failure. Must be called while holding the devlink instance
* lock.
*
* Snapshot IDs are tracked using an xarray which stores the number of
* users of the snapshot id.
*
* Note that the caller of this function counts as a 'user', in order to
* avoid race conditions. The caller must release its hold on the
* snapshot by using devlink_region_snapshot_id_put.
*/
static int __devlink_region_snapshot_id_get(struct devlink *devlink, u32 *id)
{
return xa_alloc(&devlink->snapshot_ids, id, xa_mk_value(1),
xa_limit_32b, GFP_KERNEL);
}
/**
* __devlink_region_snapshot_create - create a new snapshot
* This will add a new snapshot of a region. The snapshot
* will be stored on the region struct and can be accessed
* from devlink. This is useful for future analyses of snapshots.
* Multiple snapshots can be created on a region.
* The @snapshot_id should be obtained using the getter function.
*
* Must be called only while holding the region snapshot lock.
*
* @region: devlink region of the snapshot
* @data: snapshot data
* @snapshot_id: snapshot id to be created
*/
static int
__devlink_region_snapshot_create(struct devlink_region *region,
u8 *data, u32 snapshot_id)
{
struct devlink *devlink = region->devlink;
struct devlink_snapshot *snapshot;
int err;
lockdep_assert_held(®ion->snapshot_lock);
/* check if region can hold one more snapshot */
if (region->cur_snapshots == region->max_snapshots)
return -ENOSPC;
if (devlink_region_snapshot_get_by_id(region, snapshot_id))
return -EEXIST;
snapshot = kzalloc(sizeof(*snapshot), GFP_KERNEL);
if (!snapshot)
return -ENOMEM;
err = __devlink_snapshot_id_increment(devlink, snapshot_id);
if (err)
goto err_snapshot_id_increment;
snapshot->id = snapshot_id;
snapshot->region = region;
snapshot->data = data;
list_add_tail(&snapshot->list, ®ion->snapshot_list);
region->cur_snapshots++;
devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_NEW);
return 0;
err_snapshot_id_increment:
kfree(snapshot);
return err;
}
static void devlink_region_snapshot_del(struct devlink_region *region,
struct devlink_snapshot *snapshot)
{
struct devlink *devlink = region->devlink;
lockdep_assert_held(®ion->snapshot_lock);
devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_DEL);
region->cur_snapshots--;
list_del(&snapshot->list);
region->ops->destructor(snapshot->data);
__devlink_snapshot_id_decrement(devlink, snapshot->id);
kfree(snapshot);
}
int devlink_nl_region_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct devlink *devlink = info->user_ptr[0];
struct devlink_port *port = NULL;
struct devlink_region *region;
const char *region_name;
struct sk_buff *msg;
unsigned int index;
int err;
if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_REGION_NAME))
return -EINVAL;
if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
port = devlink_port_get_by_index(devlink, index);
if (!port)
return -ENODEV;
}
region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
if (port)
region = devlink_port_region_get_by_name(port, region_name);
else
region = devlink_region_get_by_name(devlink, region_name);
if (!region)
return -EINVAL;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
err = devlink_nl_region_fill(msg, devlink, DEVLINK_CMD_REGION_GET,
info->snd_portid, info->snd_seq, 0,
region);
if (err) {
nlmsg_free(msg);
return err;
}
return genlmsg_reply(msg, info);
}
static int devlink_nl_cmd_region_get_port_dumpit(struct sk_buff *msg,
struct netlink_callback *cb,
struct devlink_port *port,
int *idx, int start, int flags)
{
struct devlink_region *region;
int err = 0;
list_for_each_entry(region, &port->region_list, list) {
if (*idx < start) {
(*idx)++;
continue;
}
err = devlink_nl_region_fill(msg, port->devlink,
DEVLINK_CMD_REGION_GET,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
flags, region);
if (err)
goto out;
(*idx)++;
}
out:
return err;
}
static int devlink_nl_region_get_dump_one(struct sk_buff *msg,
struct devlink *devlink,
struct netlink_callback *cb,
int flags)
{
struct devlink_nl_dump_state *state = devlink_dump_state(cb);
struct devlink_region *region;
struct devlink_port *port;
unsigned long port_index;
int idx = 0;
int err;
list_for_each_entry(region, &devlink->region_list, list) {
if (idx < state->idx) {
idx++;
continue;
}
err = devlink_nl_region_fill(msg, devlink,
DEVLINK_CMD_REGION_GET,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, flags,
region);
if (err) {
state->idx = idx;
return err;
}
idx++;
}
xa_for_each(&devlink->ports, port_index, port) {
err = devlink_nl_cmd_region_get_port_dumpit(msg, cb, port, &idx,
state->idx, flags);
if (err) {
state->idx = idx;
return err;
}
}
return 0;
}
int devlink_nl_region_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
return devlink_nl_dumpit(skb, cb, devlink_nl_region_get_dump_one);
}
int devlink_nl_region_del_doit(struct sk_buff *skb, struct genl_info *info)
{
struct devlink *devlink = info->user_ptr[0];
struct devlink_snapshot *snapshot;
struct devlink_port *port = NULL;
struct devlink_region *region;
const char *region_name;
unsigned int index;
u32 snapshot_id;
if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_REGION_NAME) ||
GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_REGION_SNAPSHOT_ID))
return -EINVAL;
region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
snapshot_id = nla_get_u32(info->attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]);
if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
port = devlink_port_get_by_index(devlink, index);
if (!port)
return -ENODEV;
}
if (port)
region = devlink_port_region_get_by_name(port, region_name);
else
region = devlink_region_get_by_name(devlink, region_name);
if (!region)
return -EINVAL;
mutex_lock(®ion->snapshot_lock);
snapshot = devlink_region_snapshot_get_by_id(region, snapshot_id);
if (!snapshot) {
mutex_unlock(®ion->snapshot_lock);
return -EINVAL;
}
devlink_region_snapshot_del(region, snapshot);
mutex_unlock(®ion->snapshot_lock);
return 0;
}
int devlink_nl_region_new_doit(struct sk_buff *skb, struct genl_info *info)
{
struct devlink *devlink = info->user_ptr[0];
struct devlink_snapshot *snapshot;
struct devlink_port *port = NULL;
struct nlattr *snapshot_id_attr;
struct devlink_region *region;
const char *region_name;
unsigned int index;
u32 snapshot_id;
u8 *data;
int err;
if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_REGION_NAME)) {
NL_SET_ERR_MSG(info->extack, "No region name provided");
return -EINVAL;
}
region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]);
if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
port = devlink_port_get_by_index(devlink, index);
if (!port)
return -ENODEV;
}
if (port)
region = devlink_port_region_get_by_name(port, region_name);
else
region = devlink_region_get_by_name(devlink, region_name);
if (!region) {
NL_SET_ERR_MSG(info->extack, "The requested region does not exist");
return -EINVAL;
}
if (!region->ops->snapshot) {
NL_SET_ERR_MSG(info->extack, "The requested region does not support taking an immediate snapshot");
return -EOPNOTSUPP;
}
mutex_lock(®ion->snapshot_lock);
if (region->cur_snapshots == region->max_snapshots) {
NL_SET_ERR_MSG(info->extack, "The region has reached the maximum number of stored snapshots");
err = -ENOSPC;
goto unlock;
}
snapshot_id_attr = info->attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID];
if (snapshot_id_attr) {
snapshot_id = nla_get_u32(snapshot_id_attr);
if (devlink_region_snapshot_get_by_id(region, snapshot_id)) {
NL_SET_ERR_MSG(info->extack, "The requested snapshot id is already in use");
err = -EEXIST;
goto unlock;
}
err = __devlink_snapshot_id_insert(devlink, snapshot_id);
if (err)
goto unlock;
} else {
err = __devlink_region_snapshot_id_get(devlink, &snapshot_id);
if (err) {
NL_SET_ERR_MSG(info->extack, "Failed to allocate a new snapshot id");
goto unlock;
}
}
if (port)
err = region->port_ops->snapshot(port, region->port_ops,
info->extack, &data);
else
err = region->ops->snapshot(devlink, region->ops,
info->extack, &data);
if (err)
goto err_snapshot_capture;
err = __devlink_region_snapshot_create(region, data, snapshot_id);
if (err)
goto err_snapshot_create;
if (!snapshot_id_attr) {
struct sk_buff *msg;
snapshot = devlink_region_snapshot_get_by_id(region,
snapshot_id);
if (WARN_ON(!snapshot)) {
err = -EINVAL;
goto unlock;
}
msg = devlink_nl_region_notify_build(region, snapshot,
DEVLINK_CMD_REGION_NEW,
info->snd_portid,
info->snd_seq);
err = PTR_ERR_OR_ZERO(msg);
if (err)
goto err_notify;
err = genlmsg_reply(msg, info);
if (err)
goto err_notify;
}
mutex_unlock(®ion->snapshot_lock);
return 0;
err_snapshot_create:
region->ops->destructor(data);
err_snapshot_capture:
__devlink_snapshot_id_decrement(devlink, snapshot_id);
mutex_unlock(®ion->snapshot_lock);
return err;
err_notify:
devlink_region_snapshot_del(region, snapshot);
unlock:
mutex_unlock(®ion->snapshot_lock);
return err;
}
static int devlink_nl_cmd_region_read_chunk_fill(struct sk_buff *msg,
u8 *chunk, u32 chunk_size,
u64 addr)
{
struct nlattr *chunk_attr;
int err;
chunk_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_REGION_CHUNK);
if (!chunk_attr)
return -EINVAL;
err = nla_put(msg, DEVLINK_ATTR_REGION_CHUNK_DATA, chunk_size, chunk);
if (err)
goto nla_put_failure;
err = nla_put_u64_64bit(msg, DEVLINK_ATTR_REGION_CHUNK_ADDR, addr,
DEVLINK_ATTR_PAD);
if (err)
goto nla_put_failure;
nla_nest_end(msg, chunk_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, chunk_attr);
return err;
}
#define DEVLINK_REGION_READ_CHUNK_SIZE 256
typedef int devlink_chunk_fill_t(void *cb_priv, u8 *chunk, u32 chunk_size,
u64 curr_offset,
struct netlink_ext_ack *extack);
static int
devlink_nl_region_read_fill(struct sk_buff *skb, devlink_chunk_fill_t *cb,
void *cb_priv, u64 start_offset, u64 end_offset,
u64 *new_offset, struct netlink_ext_ack *extack)
{
u64 curr_offset = start_offset;
int err = 0;
u8 *data;
/* Allocate and re-use a single buffer */
data = kmalloc(DEVLINK_REGION_READ_CHUNK_SIZE, GFP_KERNEL);
if (!data)
return -ENOMEM;
*new_offset = start_offset;
while (curr_offset < end_offset) {
u32 data_size;
data_size = min_t(u32, end_offset - curr_offset,
DEVLINK_REGION_READ_CHUNK_SIZE);
err = cb(cb_priv, data, data_size, curr_offset, extack);
if (err)
break;
err = devlink_nl_cmd_region_read_chunk_fill(skb, data, data_size, curr_offset);
if (err)
break;
curr_offset += data_size;
}
*new_offset = curr_offset;
kfree(data);
return err;
}
static int
devlink_region_snapshot_fill(void *cb_priv, u8 *chunk, u32 chunk_size,
u64 curr_offset,
struct netlink_ext_ack __always_unused *extack)
{
struct devlink_snapshot *snapshot = cb_priv;
memcpy(chunk, &snapshot->data[curr_offset], chunk_size);
return 0;
}
static int
devlink_region_port_direct_fill(void *cb_priv, u8 *chunk, u32 chunk_size,
u64 curr_offset, struct netlink_ext_ack *extack)
{
struct devlink_region *region = cb_priv;
return region->port_ops->read(region->port, region->port_ops, extack,
curr_offset, chunk_size, chunk);
}
static int
devlink_region_direct_fill(void *cb_priv, u8 *chunk, u32 chunk_size,
u64 curr_offset, struct netlink_ext_ack *extack)
{
struct devlink_region *region = cb_priv;
return region->ops->read(region->devlink, region->ops, extack,
curr_offset, chunk_size, chunk);
}
int devlink_nl_region_read_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
struct devlink_nl_dump_state *state = devlink_dump_state(cb);
struct nlattr *chunks_attr, *region_attr, *snapshot_attr;
u64 ret_offset, start_offset, end_offset = U64_MAX;
struct nlattr **attrs = info->info.attrs;
struct devlink_port *port = NULL;
devlink_chunk_fill_t *region_cb;
struct devlink_region *region;
const char *region_name;
struct devlink *devlink;
unsigned int index;
void *region_cb_priv;
void *hdr;
int err;
start_offset = state->start_offset;
devlink = devlink_get_from_attrs_lock(sock_net(cb->skb->sk), attrs);
if (IS_ERR(devlink))
return PTR_ERR(devlink);
if (!attrs[DEVLINK_ATTR_REGION_NAME]) {
NL_SET_ERR_MSG(cb->extack, "No region name provided");
err = -EINVAL;
goto out_unlock;
}
if (attrs[DEVLINK_ATTR_PORT_INDEX]) {
index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);
port = devlink_port_get_by_index(devlink, index);
if (!port) {
err = -ENODEV;
goto out_unlock;
}
}
region_attr = attrs[DEVLINK_ATTR_REGION_NAME];
region_name = nla_data(region_attr);
if (port)
region = devlink_port_region_get_by_name(port, region_name);
else
region = devlink_region_get_by_name(devlink, region_name);
if (!region) {
NL_SET_ERR_MSG_ATTR(cb->extack, region_attr, "Requested region does not exist");
err = -EINVAL;
goto out_unlock;
}
snapshot_attr = attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID];
if (!snapshot_attr) {
if (!nla_get_flag(attrs[DEVLINK_ATTR_REGION_DIRECT])) {
NL_SET_ERR_MSG(cb->extack, "No snapshot id provided");
err = -EINVAL;
goto out_unlock;
}
if (!region->ops->read) {
NL_SET_ERR_MSG(cb->extack, "Requested region does not support direct read");
err = -EOPNOTSUPP;
goto out_unlock;
}
if (port)
region_cb = &devlink_region_port_direct_fill;
else
region_cb = &devlink_region_direct_fill;
region_cb_priv = region;
} else {
struct devlink_snapshot *snapshot;
u32 snapshot_id;
if (nla_get_flag(attrs[DEVLINK_ATTR_REGION_DIRECT])) {
NL_SET_ERR_MSG_ATTR(cb->extack, snapshot_attr, "Direct region read does not use snapshot");
err = -EINVAL;
goto out_unlock;
}
snapshot_id = nla_get_u32(snapshot_attr);
snapshot = devlink_region_snapshot_get_by_id(region, snapshot_id);
if (!snapshot) {
NL_SET_ERR_MSG_ATTR(cb->extack, snapshot_attr, "Requested snapshot does not exist");
err = -EINVAL;
goto out_unlock;
}
region_cb = &devlink_region_snapshot_fill;
region_cb_priv = snapshot;
}
if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
if (!start_offset)
start_offset =
nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
}
if (end_offset > region->size)
end_offset = region->size;
/* return 0 if there is no further data to read */
if (start_offset == end_offset) {
err = 0;
goto out_unlock;
}
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&devlink_nl_family, NLM_F_ACK | NLM_F_MULTI,
DEVLINK_CMD_REGION_READ);
if (!hdr) {
err = -EMSGSIZE;
goto out_unlock;
}
err = devlink_nl_put_handle(skb, devlink);
if (err)
goto nla_put_failure;
if (region->port) {
err = nla_put_u32(skb, DEVLINK_ATTR_PORT_INDEX,
region->port->index);
if (err)
goto nla_put_failure;
}
err = nla_put_string(skb, DEVLINK_ATTR_REGION_NAME, region_name);
if (err)
goto nla_put_failure;