aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/mlx4/alias_GUID.c
blob: 782499abcd9868d63b5f789ee002a0594b00c4d6 (plain) (blame)
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
/*
 * Copyright (c) 2012 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 /***********************************************************/
/*This file support the handling of the Alias GUID feature. */
/***********************************************************/
#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_pack.h>
#include <linux/mlx4/cmd.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <rdma/ib_user_verbs.h>
#include <linux/delay.h>
#include "mlx4_ib.h"

/*
The driver keeps the current state of all guids, as they are in the HW.
Whenever we receive an smp mad GUIDInfo record, the data will be cached.
*/

struct mlx4_alias_guid_work_context {
	u8 port;
	struct mlx4_ib_dev     *dev ;
	struct ib_sa_query     *sa_query;
	struct completion	done;
	int			query_id;
	struct list_head	list;
	int			block_num;
	ib_sa_comp_mask		guid_indexes;
	u8			method;
};

struct mlx4_next_alias_guid_work {
	u8 port;
	u8 block_num;
	u8 method;
	struct mlx4_sriov_alias_guid_info_rec_det rec_det;
};

static int get_low_record_time_index(struct mlx4_ib_dev *dev, u8 port,
				     int *resched_delay_sec);

void mlx4_ib_update_cache_on_guid_change(struct mlx4_ib_dev *dev, int block_num,
					 u8 port_num, u8 *p_data)
{
	int i;
	u64 guid_indexes;
	int slave_id;
	int port_index = port_num - 1;

	if (!mlx4_is_master(dev->dev))
		return;

	guid_indexes = be64_to_cpu((__force __be64) dev->sriov.alias_guid.
				   ports_guid[port_num - 1].
				   all_rec_per_port[block_num].guid_indexes);
	pr_debug("port: %d, guid_indexes: 0x%llx\n", port_num, guid_indexes);

	for (i = 0; i < NUM_ALIAS_GUID_IN_REC; i++) {
		/* The location of the specific index starts from bit number 4
		 * until bit num 11 */
		if (test_bit(i + 4, (unsigned long *)&guid_indexes)) {
			slave_id = (block_num * NUM_ALIAS_GUID_IN_REC) + i ;
			if (slave_id >= dev->dev->num_slaves) {
				pr_debug("The last slave: %d\n", slave_id);
				return;
			}

			/* cache the guid: */
			memcpy(&dev->sriov.demux[port_index].guid_cache[slave_id],
			       &p_data[i * GUID_REC_SIZE],
			       GUID_REC_SIZE);
		} else
			pr_debug("Guid number: %d in block: %d"
				 " was not updated\n", i, block_num);
	}
}

static __be64 get_cached_alias_guid(struct mlx4_ib_dev *dev, int port, int index)
{
	if (index >= NUM_ALIAS_GUID_PER_PORT) {
		pr_err("%s: ERROR: asked for index:%d\n", __func__, index);
		return (__force __be64) -1;
	}
	return *(__be64 *)&dev->sriov.demux[port - 1].guid_cache[index];
}


ib_sa_comp_mask mlx4_ib_get_aguid_comp_mask_from_ix(int index)
{
	return IB_SA_COMP_MASK(4 + index);
}

void mlx4_ib_slave_alias_guid_event(struct mlx4_ib_dev *dev, int slave,
				    int port,  int slave_init)
{
	__be64 curr_guid, required_guid;
	int record_num = slave / 8;
	int index = slave % 8;
	int port_index = port - 1;
	unsigned long flags;
	int do_work = 0;

	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags);
	if (dev->sriov.alias_guid.ports_guid[port_index].state_flags &
	    GUID_STATE_NEED_PORT_INIT)
		goto unlock;
	if (!slave_init) {
		curr_guid = *(__be64 *)&dev->sriov.
			alias_guid.ports_guid[port_index].
			all_rec_per_port[record_num].
			all_recs[GUID_REC_SIZE * index];
		if (curr_guid == cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL) ||
		    !curr_guid)
			goto unlock;
		required_guid = cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL);
	} else {
		required_guid = mlx4_get_admin_guid(dev->dev, slave, port);
		if (required_guid == cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL))
			goto unlock;
	}
	*(__be64 *)&dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[record_num].
		all_recs[GUID_REC_SIZE * index] = required_guid;
	dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[record_num].guid_indexes
		|= mlx4_ib_get_aguid_comp_mask_from_ix(index);
	dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[record_num].status
		= MLX4_GUID_INFO_STATUS_IDLE;
	/* set to run immediately */
	dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[record_num].time_to_run = 0;
	dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[record_num].
		guids_retry_schedule[index] = 0;
	do_work = 1;
unlock:
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags);

	if (do_work)
		mlx4_ib_init_alias_guid_work(dev, port_index);
}

/*
 * Whenever new GUID is set/unset (guid table change) create event and
 * notify the relevant slave (master also should be notified).
 * If the GUID value is not as we have in the cache the slave will not be
 * updated; in this case it waits for the smp_snoop or the port management
 * event to call the function and to update the slave.
 * block_number - the index of the block (16 blocks available)
 * port_number - 1 or 2
 */
void mlx4_ib_notify_slaves_on_guid_change(struct mlx4_ib_dev *dev,
					  int block_num, u8 port_num,
					  u8 *p_data)
{
	int i;
	u64 guid_indexes;
	int slave_id, slave_port;
	enum slave_port_state new_state;
	enum slave_port_state prev_state;
	__be64 tmp_cur_ag, form_cache_ag;
	enum slave_port_gen_event gen_event;
	struct mlx4_sriov_alias_guid_info_rec_det *rec;
	unsigned long flags;
	__be64 required_value;

	if (!mlx4_is_master(dev->dev))
		return;

	rec = &dev->sriov.alias_guid.ports_guid[port_num - 1].
			all_rec_per_port[block_num];
	guid_indexes = be64_to_cpu((__force __be64) dev->sriov.alias_guid.
				   ports_guid[port_num - 1].
				   all_rec_per_port[block_num].guid_indexes);
	pr_debug("port: %d, guid_indexes: 0x%llx\n", port_num, guid_indexes);

	/*calculate the slaves and notify them*/
	for (i = 0; i < NUM_ALIAS_GUID_IN_REC; i++) {
		/* the location of the specific index runs from bits 4..11 */
		if (!(test_bit(i + 4, (unsigned long *)&guid_indexes)))
			continue;

		slave_id = (block_num * NUM_ALIAS_GUID_IN_REC) + i ;
		if (slave_id >= dev->dev->persist->num_vfs + 1)
			return;

		slave_port = mlx4_phys_to_slave_port(dev->dev, slave_id, port_num);
		if (slave_port < 0) /* this port isn't available for the VF */
			continue;

		tmp_cur_ag = *(__be64 *)&p_data[i * GUID_REC_SIZE];
		form_cache_ag = get_cached_alias_guid(dev, port_num,
					(NUM_ALIAS_GUID_IN_REC * block_num) + i);
		/*
		 * Check if guid is not the same as in the cache,
		 * If it is different, wait for the snoop_smp or the port mgmt
		 * change event to update the slave on its port state change
		 */
		if (tmp_cur_ag != form_cache_ag)
			continue;

		spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags);
		required_value = *(__be64 *)&rec->all_recs[i * GUID_REC_SIZE];

		if (required_value == cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL))
			required_value = 0;

		if (tmp_cur_ag == required_value) {
			rec->guid_indexes = rec->guid_indexes &
			       ~mlx4_ib_get_aguid_comp_mask_from_ix(i);
		} else {
			/* may notify port down if value is 0 */
			if (tmp_cur_ag != MLX4_NOT_SET_GUID) {
				spin_unlock_irqrestore(&dev->sriov.
					alias_guid.ag_work_lock, flags);
				continue;
			}
		}
		spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock,
				       flags);
		mlx4_gen_guid_change_eqe(dev->dev, slave_id, port_num);
		/*2 cases: Valid GUID, and Invalid Guid*/

		if (tmp_cur_ag != MLX4_NOT_SET_GUID) { /*valid GUID*/
			prev_state = mlx4_get_slave_port_state(dev->dev, slave_id, port_num);
			new_state = set_and_calc_slave_port_state(dev->dev, slave_id, port_num,
								  MLX4_PORT_STATE_IB_PORT_STATE_EVENT_GID_VALID,
								  &gen_event);
			pr_debug("slave: %d, port: %d prev_port_state: %d,"
				 " new_port_state: %d, gen_event: %d\n",
				 slave_id, port_num, prev_state, new_state, gen_event);
			if (gen_event == SLAVE_PORT_GEN_EVENT_UP) {
				pr_debug("sending PORT_UP event to slave: %d, port: %d\n",
					 slave_id, port_num);
				mlx4_gen_port_state_change_eqe(dev->dev, slave_id,
							       port_num, MLX4_PORT_CHANGE_SUBTYPE_ACTIVE);
			}
		} else { /* request to invalidate GUID */
			set_and_calc_slave_port_state(dev->dev, slave_id, port_num,
						      MLX4_PORT_STATE_IB_EVENT_GID_INVALID,
						      &gen_event);
			if (gen_event == SLAVE_PORT_GEN_EVENT_DOWN) {
				pr_debug("sending PORT DOWN event to slave: %d, port: %d\n",
					 slave_id, port_num);
				mlx4_gen_port_state_change_eqe(dev->dev,
							       slave_id,
							       port_num,
							       MLX4_PORT_CHANGE_SUBTYPE_DOWN);
			}
		}
	}
}

static void aliasguid_query_handler(int status,
				    struct ib_sa_guidinfo_rec *guid_rec,
				    void *context)
{
	struct mlx4_ib_dev *dev;
	struct mlx4_alias_guid_work_context *cb_ctx = context;
	u8 port_index ;
	int i;
	struct mlx4_sriov_alias_guid_info_rec_det *rec;
	unsigned long flags, flags1;
	ib_sa_comp_mask declined_guid_indexes = 0;
	ib_sa_comp_mask applied_guid_indexes = 0;
	unsigned int resched_delay_sec = 0;

	if (!context)
		return;

	dev = cb_ctx->dev;
	port_index = cb_ctx->port - 1;
	rec = &dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[cb_ctx->block_num];

	if (status) {
		pr_debug("(port: %d) failed: status = %d\n",
			 cb_ctx->port, status);
		rec->time_to_run = ktime_get_boot_ns() + 1 * NSEC_PER_SEC;
		goto out;
	}

	if (guid_rec->block_num != cb_ctx->block_num) {
		pr_err("block num mismatch: %d != %d\n",
		       cb_ctx->block_num, guid_rec->block_num);
		goto out;
	}

	pr_debug("lid/port: %d/%d, block_num: %d\n",
		 be16_to_cpu(guid_rec->lid), cb_ctx->port,
		 guid_rec->block_num);

	rec = &dev->sriov.alias_guid.ports_guid[port_index].
		all_rec_per_port[guid_rec->block_num];

	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags);
	for (i = 0 ; i < NUM_ALIAS_GUID_IN_REC; i++) {
		__be64 sm_response, required_val;

		if (!(cb_ctx->guid_indexes &
			mlx4_ib_get_aguid_comp_mask_from_ix(i)))
			continue;
		sm_response = *(__be64 *)&guid_rec->guid_info_list
				[i * GUID_REC_SIZE];
		required_val = *(__be64 *)&rec->all_recs[i * GUID_REC_SIZE];
		if (cb_ctx->method == MLX4_GUID_INFO_RECORD_DELETE) {
			if (required_val ==
			    cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL))
				goto next_entry;

			/* A new value was set till we got the response */
			pr_debug("need to set new value %llx, record num %d, block_num:%d\n",
				 be64_to_cpu(required_val),
				 i, guid_rec->block_num);
			goto entry_declined;
		}

		/* check if the SM didn't assign one of the records.
		 * if it didn't, re-ask for.
		 */
		if (sm_response == MLX4_NOT_SET_GUID) {
			if (rec->guids_retry_schedule[i] == 0)
				mlx4_ib_warn(&dev->ib_dev,
					     "%s:Record num %d in  block_num: %d was declined by SM\n",
					     __func__, i,
					     guid_rec->block_num);
			goto entry_declined;
		} else {
		       /* properly assigned record. */
		       /* We save the GUID we just got from the SM in the
			* admin_guid in order to be persistent, and in the
			* request from the sm the process will ask for the same GUID */
			if (required_val &&
			    sm_response != required_val) {
				/* Warn only on first retry */
				if (rec->guids_retry_schedule[i] == 0)
					mlx4_ib_warn(&dev->ib_dev, "%s: Failed to set"
						     " admin guid after SysAdmin "
						     "configuration. "
						     "Record num %d in block_num:%d "
						     "was declined by SM, "
						     "new val(0x%llx) was kept, SM returned (0x%llx)\n",
						      __func__, i,
						     guid_rec->block_num,
						     be64_to_cpu(required_val),
						     be64_to_cpu(sm_response));
				goto entry_declined;
			} else {
				*(__be64 *)&rec->all_recs[i * GUID_REC_SIZE] =
					sm_response;
				if (required_val == 0)
					mlx4_set_admin_guid(dev->dev,
							    sm_response,
							    (guid_rec->block_num
							    * NUM_ALIAS_GUID_IN_REC) + i,
							    cb_ctx->port);
				goto next_entry;
			}
		}
entry_declined:
		declined_guid_indexes |= mlx4_ib_get_aguid_comp_mask_from_ix(i);
		rec->guids_retry_schedule[i] =
			(rec->guids_retry_schedule[i] == 0) ?  1 :
			min((unsigned int)60,
			    rec->guids_retry_schedule[i] * 2);
		/* using the minimum value among all entries in that record */
		resched_delay_sec = (resched_delay_sec == 0) ?
				rec->guids_retry_schedule[i] :
				min(resched_delay_sec,
				    rec->guids_retry_schedule[i]);
		continue;

next_entry:
		rec->guids_retry_schedule[i] = 0;
	}

	applied_guid_indexes =  cb_ctx->guid_indexes & ~declined_guid_indexes;
	if (declined_guid_indexes ||
	    rec->guid_indexes & ~(applied_guid_indexes)) {
		pr_debug("record=%d wasn't fully set, guid_indexes=0x%llx applied_indexes=0x%llx, declined_indexes=0x%llx\n",
			 guid_rec->block_num,
			 be64_to_cpu((__force __be64)rec->guid_indexes),
			 be64_to_cpu((__force __be64)applied_guid_indexes),
			 be64_to_cpu((__force __be64)declined_guid_indexes));
		rec->time_to_run = ktime_get_boot_ns() +
			resched_delay_sec * NSEC_PER_SEC;
	} else {
		rec->status = MLX4_GUID_INFO_STATUS_SET;
	}
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags);
	/*
	The func is call here to close the cases when the
	sm doesn't send smp, so in the sa response the driver
	notifies the slave.
	*/
	mlx4_ib_notify_slaves_on_guid_change(dev, guid_rec->block_num,
					     cb_ctx->port,
					     guid_rec->guid_info_list);
out:
	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);
	if (!dev->sriov.is_going_down) {
		get_low_record_time_index(dev, port_index, &resched_delay_sec);
		queue_delayed_work(dev->sriov.alias_guid.ports_guid[port_index].wq,
				   &dev->sriov.alias_guid.ports_guid[port_index].
				   alias_guid_work,
				   msecs_to_jiffies(resched_delay_sec * 1000));
	}
	if (cb_ctx->sa_query) {
		list_del(&cb_ctx->list);
		kfree(cb_ctx);
	} else
		complete(&cb_ctx->done);
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);
	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
}

static void invalidate_guid_record(struct mlx4_ib_dev *dev, u8 port, int index)
{
	int i;
	u64 cur_admin_val;
	ib_sa_comp_mask comp_mask = 0;

	dev->sriov.alias_guid.ports_guid[port - 1].all_rec_per_port[index].status
		= MLX4_GUID_INFO_STATUS_SET;

	/* calculate the comp_mask for that record.*/
	for (i = 0; i < NUM_ALIAS_GUID_IN_REC; i++) {
		cur_admin_val =
			*(u64 *)&dev->sriov.alias_guid.ports_guid[port - 1].
			all_rec_per_port[index].all_recs[GUID_REC_SIZE * i];
		/*
		check the admin value: if it's for delete (~00LL) or
		it is the first guid of the first record (hw guid) or
		the records is not in ownership of the sysadmin and the sm doesn't
		need to assign GUIDs, then don't put it up for assignment.
		*/
		if (MLX4_GUID_FOR_DELETE_VAL == cur_admin_val ||
		    (!index && !i))
			continue;
		comp_mask |= mlx4_ib_get_aguid_comp_mask_from_ix(i);
	}
	dev->sriov.alias_guid.ports_guid[port - 1].
		all_rec_per_port[index].guid_indexes |= comp_mask;
	if (dev->sriov.alias_guid.ports_guid[port - 1].
	    all_rec_per_port[index].guid_indexes)
		dev->sriov.alias_guid.ports_guid[port - 1].
		all_rec_per_port[index].status = MLX4_GUID_INFO_STATUS_IDLE;

}

static int set_guid_rec(struct ib_device *ibdev,
			struct mlx4_next_alias_guid_work *rec)
{
	int err;
	struct mlx4_ib_dev *dev = to_mdev(ibdev);
	struct ib_sa_guidinfo_rec guid_info_rec;
	ib_sa_comp_mask comp_mask;
	struct ib_port_attr attr;
	struct mlx4_alias_guid_work_context *callback_context;
	unsigned long resched_delay, flags, flags1;
	u8 port = rec->port + 1;
	int index = rec->block_num;
	struct mlx4_sriov_alias_guid_info_rec_det *rec_det = &rec->rec_det;
	struct list_head *head =
		&dev->sriov.alias_guid.ports_guid[port - 1].cb_list;

	memset(&attr, 0, sizeof(attr));
	err = __mlx4_ib_query_port(ibdev, port, &attr, 1);
	if (err) {
		pr_debug("mlx4_ib_query_port failed (err: %d), port: %d\n",
			 err, port);
		return err;
	}
	/*check the port was configured by the sm, otherwise no need to send */
	if (attr.state != IB_PORT_ACTIVE) {
		pr_debug("port %d not active...rescheduling\n", port);
		resched_delay = 5 * HZ;
		err = -EAGAIN;
		goto new_schedule;
	}

	callback_context = kmalloc(sizeof *callback_context, GFP_KERNEL);
	if (!callback_context) {
		err = -ENOMEM;
		resched_delay = HZ * 5;
		goto new_schedule;
	}
	callback_context->port = port;
	callback_context->dev = dev;
	callback_context->block_num = index;
	callback_context->guid_indexes = rec_det->guid_indexes;
	callback_context->method = rec->method;

	memset(&guid_info_rec, 0, sizeof (struct ib_sa_guidinfo_rec));

	guid_info_rec.lid = ib_lid_be16(attr.lid);
	guid_info_rec.block_num = index;

	memcpy(guid_info_rec.guid_info_list, rec_det->all_recs,
	       GUID_REC_SIZE * NUM_ALIAS_GUID_IN_REC);
	comp_mask = IB_SA_GUIDINFO_REC_LID | IB_SA_GUIDINFO_REC_BLOCK_NUM |
		rec_det->guid_indexes;

	init_completion(&callback_context->done);
	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);
	list_add_tail(&callback_context->list, head);
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);

	callback_context->query_id =
		ib_sa_guid_info_rec_query(dev->sriov.alias_guid.sa_client,
					  ibdev, port, &guid_info_rec,
					  comp_mask, rec->method, 1000,
					  GFP_KERNEL, aliasguid_query_handler,
					  callback_context,
					  &callback_context->sa_query);
	if (callback_context->query_id < 0) {
		pr_debug("ib_sa_guid_info_rec_query failed, query_id: "
			 "%d. will reschedule to the next 1 sec.\n",
			 callback_context->query_id);
		spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);
		list_del(&callback_context->list);
		kfree(callback_context);
		spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);
		resched_delay = 1 * HZ;
		err = -EAGAIN;
		goto new_schedule;
	}
	err = 0;
	goto out;

new_schedule:
	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);
	invalidate_guid_record(dev, port, index);
	if (!dev->sriov.is_going_down) {
		queue_delayed_work(dev->sriov.alias_guid.ports_guid[port - 1].wq,
				   &dev->sriov.alias_guid.ports_guid[port - 1].alias_guid_work,
				   resched_delay);
	}
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);
	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);

out:
	return err;
}

static void mlx4_ib_guid_port_init(struct mlx4_ib_dev *dev, int port)
{
	int j, k, entry;
	__be64 guid;

	/*Check if the SM doesn't need to assign the GUIDs*/
	for (j = 0; j < NUM_ALIAS_GUID_REC_IN_PORT; j++) {
		for (k = 0; k < NUM_ALIAS_GUID_IN_REC; k++) {
			entry = j * NUM_ALIAS_GUID_IN_REC + k;
			/* no request for the 0 entry (hw guid) */
			if (!entry || entry > dev->dev->persist->num_vfs ||
			    !mlx4_is_slave_active(dev->dev, entry))
				continue;
			guid = mlx4_get_admin_guid(dev->dev, entry, port);
			*(__be64 *)&dev->sriov.alias_guid.ports_guid[port - 1].
				all_rec_per_port[j].all_recs
				[GUID_REC_SIZE * k] = guid;
			pr_debug("guid was set, entry=%d, val=0x%llx, port=%d\n",
				 entry,
				 be64_to_cpu(guid),
				 port);
		}
	}
}
void mlx4_ib_invalidate_all_guid_record(struct mlx4_ib_dev *dev, int port)
{
	int i;
	unsigned long flags, flags1;

	pr_debug("port %d\n", port);

	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);

	if (dev->sriov.alias_guid.ports_guid[port - 1].state_flags &
		GUID_STATE_NEED_PORT_INIT) {
		mlx4_ib_guid_port_init(dev, port);
		dev->sriov.alias_guid.ports_guid[port - 1].state_flags &=
			(~GUID_STATE_NEED_PORT_INIT);
	}
	for (i = 0; i < NUM_ALIAS_GUID_REC_IN_PORT; i++)
		invalidate_guid_record(dev, port, i);

	if (mlx4_is_master(dev->dev) && !dev->sriov.is_going_down) {
		/*
		make sure no work waits in the queue, if the work is already
		queued(not on the timer) the cancel will fail. That is not a problem
		because we just want the work started.
		*/
		cancel_delayed_work(&dev->sriov.alias_guid.
				      ports_guid[port - 1].alias_guid_work);
		queue_delayed_work(dev->sriov.alias_guid.ports_guid[port - 1].wq,
				   &dev->sriov.alias_guid.ports_guid[port - 1].alias_guid_work,
				   0);
	}
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);
	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
}

static void set_required_record(struct mlx4_ib_dev *dev, u8 port,
				struct mlx4_next_alias_guid_work *next_rec,
				int record_index)
{
	int i;
	int lowset_time_entry = -1;
	int lowest_time = 0;
	ib_sa_comp_mask delete_guid_indexes = 0;
	ib_sa_comp_mask set_guid_indexes = 0;
	struct mlx4_sriov_alias_guid_info_rec_det *rec =
			&dev->sriov.alias_guid.ports_guid[port].
			all_rec_per_port[record_index];

	for (i = 0; i < NUM_ALIAS_GUID_IN_REC; i++) {
		if (!(rec->guid_indexes &
			mlx4_ib_get_aguid_comp_mask_from_ix(i)))
			continue;

		if (*(__be64 *)&rec->all_recs[i * GUID_REC_SIZE] ==
				cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL))
			delete_guid_indexes |=
				mlx4_ib_get_aguid_comp_mask_from_ix(i);
		else
			set_guid_indexes |=
				mlx4_ib_get_aguid_comp_mask_from_ix(i);

		if (lowset_time_entry == -1 || rec->guids_retry_schedule[i] <=
			lowest_time) {
			lowset_time_entry = i;
			lowest_time = rec->guids_retry_schedule[i];
		}
	}

	memcpy(&next_rec->rec_det, rec, sizeof(*rec));
	next_rec->port = port;
	next_rec->block_num = record_index;

	if (*(__be64 *)&rec->all_recs[lowset_time_entry * GUID_REC_SIZE] ==
				cpu_to_be64(MLX4_GUID_FOR_DELETE_VAL)) {
		next_rec->rec_det.guid_indexes = delete_guid_indexes;
		next_rec->method = MLX4_GUID_INFO_RECORD_DELETE;
	} else {
		next_rec->rec_det.guid_indexes = set_guid_indexes;
		next_rec->method = MLX4_GUID_INFO_RECORD_SET;
	}
}

/* return index of record that should be updated based on lowest
 * rescheduled time
 */
static int get_low_record_time_index(struct mlx4_ib_dev *dev, u8 port,
				     int *resched_delay_sec)
{
	int record_index = -1;
	u64 low_record_time = 0;
	struct mlx4_sriov_alias_guid_info_rec_det rec;
	int j;

	for (j = 0; j < NUM_ALIAS_GUID_REC_IN_PORT; j++) {
		rec = dev->sriov.alias_guid.ports_guid[port].
			all_rec_per_port[j];
		if (rec.status == MLX4_GUID_INFO_STATUS_IDLE &&
		    rec.guid_indexes) {
			if (record_index == -1 ||
			    rec.time_to_run < low_record_time) {
				record_index = j;
				low_record_time = rec.time_to_run;
			}
		}
	}
	if (resched_delay_sec) {
		u64 curr_time = ktime_get_boot_ns();

		*resched_delay_sec = (low_record_time < curr_time) ? 0 :
			div_u64((low_record_time - curr_time), NSEC_PER_SEC);
	}

	return record_index;
}

/* The function returns the next record that was
 * not configured (or failed to be configured) */
static int get_next_record_to_update(struct mlx4_ib_dev *dev, u8 port,
				     struct mlx4_next_alias_guid_work *rec)
{
	unsigned long flags;
	int record_index;
	int ret = 0;

	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags);
	record_index = get_low_record_time_index(dev, port, NULL);

	if (record_index < 0) {
		ret = -ENOENT;
		goto out;
	}

	set_required_record(dev, port, rec, record_index);
out:
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags);
	return ret;
}

static void alias_guid_work(struct work_struct *work)
{
	struct delayed_work *delay = to_delayed_work(work);
	int ret = 0;
	struct mlx4_next_alias_guid_work *rec;
	struct mlx4_sriov_alias_guid_port_rec_det *sriov_alias_port =
		container_of(delay, struct mlx4_sriov_alias_guid_port_rec_det,
			     alias_guid_work);
	struct mlx4_sriov_alias_guid *sriov_alias_guid = sriov_alias_port->parent;
	struct mlx4_ib_sriov *ib_sriov = container_of(sriov_alias_guid,
						struct mlx4_ib_sriov,
						alias_guid);
	struct mlx4_ib_dev *dev = container_of(ib_sriov, struct mlx4_ib_dev, sriov);

	rec = kzalloc(sizeof *rec, GFP_KERNEL);
	if (!rec)
		return;

	pr_debug("starting [port: %d]...\n", sriov_alias_port->port + 1);
	ret = get_next_record_to_update(dev, sriov_alias_port->port, rec);
	if (ret) {
		pr_debug("No more records to update.\n");
		goto out;
	}

	set_guid_rec(&dev->ib_dev, rec);
out:
	kfree(rec);
}


void mlx4_ib_init_alias_guid_work(struct mlx4_ib_dev *dev, int port)
{
	unsigned long flags, flags1;

	if (!mlx4_is_master(dev->dev))
		return;
	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
	spin_lock_irqsave(&dev->sriov.alias_guid.ag_work_lock, flags1);
	if (!dev->sriov.is_going_down) {
		/* If there is pending one should cancel then run, otherwise
		  * won't run till previous one is ended as same work
		  * struct is used.
		  */
		cancel_delayed_work(&dev->sriov.alias_guid.ports_guid[port].
				    alias_guid_work);
		queue_delayed_work(dev->sriov.alias_guid.ports_guid[port].wq,
			   &dev->sriov.alias_guid.ports_guid[port].alias_guid_work, 0);
	}
	spin_unlock_irqrestore(&dev->sriov.alias_guid.ag_work_lock, flags1);
	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
}

void mlx4_ib_destroy_alias_guid_service(struct mlx4_ib_dev *dev)
{
	int i;
	struct mlx4_ib_sriov *sriov = &dev->sriov;
	struct mlx4_alias_guid_work_context *cb_ctx;
	struct mlx4_sriov_alias_guid_port_rec_det *det;
	struct ib_sa_query *sa_query;
	unsigned long flags;

	for (i = 0 ; i < dev->num_ports; i++) {
		cancel_delayed_work(&dev->sriov.alias_guid.ports_guid[i].alias_guid_work);
		det = &sriov->alias_guid.ports_guid[i];
		spin_lock_irqsave(&sriov->alias_guid.ag_work_lock, flags);
		while (!list_empty(&det->cb_list)) {
			cb_ctx = list_entry(det->cb_list.next,
					    struct mlx4_alias_guid_work_context,
					    list);
			sa_query = cb_ctx->sa_query;
			cb_ctx->sa_query = NULL;
			list_del(&cb_ctx->list);
			spin_unlock_irqrestore(&sriov->alias_guid.ag_work_lock, flags);
			ib_sa_cancel_query(cb_ctx->query_id, sa_query);
			wait_for_completion(&cb_ctx->done);
			kfree(cb_ctx);
			spin_lock_irqsave(&sriov->alias_guid.ag_work_lock, flags);
		}
		spin_unlock_irqrestore(&sriov->alias_guid.ag_work_lock, flags);
	}
	for (i = 0 ; i < dev->num_ports; i++) {
		flush_workqueue(dev->sriov.alias_guid.ports_guid[i].wq);
		destroy_workqueue(dev->sriov.alias_guid.ports_guid[i].wq);
	}
	ib_sa_unregister_client(dev->sriov.alias_guid.sa_client);
	kfree(dev->sriov.alias_guid.sa_client);
}

int mlx4_ib_init_alias_guid_service(struct mlx4_ib_dev *dev)
{
	char alias_wq_name[15];
	int ret = 0;
	int i, j;
	union ib_gid gid;

	if (!mlx4_is_master(dev->dev))
		return 0;
	dev->sriov.alias_guid.sa_client =
		kzalloc(sizeof *dev->sriov.alias_guid.sa_client, GFP_KERNEL);
	if (!dev->sriov.alias_guid.sa_client)
		return -ENOMEM;

	ib_sa_register_client(dev->sriov.alias_guid.sa_client);

	spin_lock_init(&dev->sriov.alias_guid.ag_work_lock);

	for (i = 1; i <= dev->num_ports; ++i) {
		if (dev->ib_dev.ops.query_gid(&dev->ib_dev, i, 0, &gid)) {
			ret = -EFAULT;
			goto err_unregister;
		}
	}

	for (i = 0 ; i < dev->num_ports; i++) {
		memset(&dev->sriov.alias_guid.ports_guid[i], 0,
		       sizeof (struct mlx4_sriov_alias_guid_port_rec_det));
		dev->sriov.alias_guid.ports_guid[i].state_flags |=
				GUID_STATE_NEED_PORT_INIT;
		for (j = 0; j < NUM_ALIAS_GUID_REC_IN_PORT; j++) {
			/* mark each val as it was deleted */
			memset(dev->sriov.alias_guid.ports_guid[i].
				all_rec_per_port[j].all_recs, 0xFF,
				sizeof(dev->sriov.alias_guid.ports_guid[i].
				all_rec_per_port[j].all_recs));
		}
		INIT_LIST_HEAD(&dev->sriov.alias_guid.ports_guid[i].cb_list);
		/*prepare the records, set them to be allocated by sm*/
		if (mlx4_ib_sm_guid_assign)
			for (j = 1; j < NUM_ALIAS_GUID_PER_PORT; j++)
				mlx4_set_admin_guid(dev->dev, 0, j, i + 1);
		for (j = 0 ; j < NUM_ALIAS_GUID_REC_IN_PORT; j++)
			invalidate_guid_record(dev, i + 1, j);

		dev->sriov.alias_guid.ports_guid[i].parent = &dev->sriov.alias_guid;
		dev->sriov.alias_guid.ports_guid[i].port  = i;

		snprintf(alias_wq_name, sizeof alias_wq_name, "alias_guid%d", i);
		dev->sriov.alias_guid.ports_guid[i].wq =
			alloc_ordered_workqueue(alias_wq_name, WQ_MEM_RECLAIM);
		if (!dev->sriov.alias_guid.ports_guid[i].wq) {
			ret = -ENOMEM;
			goto err_thread;
		}
		INIT_DELAYED_WORK(&dev->sriov.alias_guid.ports_guid[i].alias_guid_work,
			  alias_guid_work);
	}
	return 0;

err_thread:
	for (--i; i >= 0; i--) {
		destroy_workqueue(dev->sriov.alias_guid.ports_guid[i].wq);
		dev->sriov.alias_guid.ports_guid[i].wq = NULL;
	}

err_unregister:
	ib_sa_unregister_client(dev->sriov.alias_guid.sa_client);
	kfree(dev->sriov.alias_guid.sa_client);
	dev->sriov.alias_guid.sa_client = NULL;
	pr_err("init_alias_guid_service: Failed. (ret:%d)\n", ret);
	return ret;
}