summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/snic/snic_main.c
blob: 396b32dca07464dddbf575a37fd13ad1e3f92579 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/mempool.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>

#include "snic.h"
#include "snic_fwint.h"

#define PCI_DEVICE_ID_CISCO_SNIC	0x0046

/* Supported devices by snic module */
static struct pci_device_id snic_id_table[] = {
	{PCI_DEVICE(0x1137, PCI_DEVICE_ID_CISCO_SNIC) },
	{ 0, }	/* end of table */
};

unsigned int snic_log_level = 0x0;
module_param(snic_log_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(snic_log_level, "bitmask for snic logging levels");

#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
unsigned int snic_trace_max_pages = 16;
module_param(snic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(snic_trace_max_pages,
		"Total allocated memory pages for snic trace buffer");

#endif
unsigned int snic_max_qdepth = SNIC_DFLT_QUEUE_DEPTH;
module_param(snic_max_qdepth, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(snic_max_qdepth, "Queue depth to report for each LUN");

/*
 * snic_slave_alloc : callback function to SCSI Mid Layer, called on
 * scsi device initialization.
 */
static int
snic_slave_alloc(struct scsi_device *sdev)
{
	struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev));

	if (!tgt || snic_tgt_chkready(tgt))
		return -ENXIO;

	return 0;
}

/*
 * snic_slave_configure : callback function to SCSI Mid Layer, called on
 * scsi device initialization.
 */
static int
snic_slave_configure(struct scsi_device *sdev)
{
	struct snic *snic = shost_priv(sdev->host);
	u32 qdepth = 0, max_ios = 0;
	int tmo = SNIC_DFLT_CMD_TIMEOUT * HZ;

	/* Set Queue Depth */
	max_ios = snic_max_qdepth;
	qdepth = min_t(u32, max_ios, SNIC_MAX_QUEUE_DEPTH);
	scsi_change_queue_depth(sdev, qdepth);

	if (snic->fwinfo.io_tmo > 1)
		tmo = snic->fwinfo.io_tmo * HZ;

	/* FW requires extended timeouts */
	blk_queue_rq_timeout(sdev->request_queue, tmo);

	return 0;
}

static int
snic_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
	struct snic *snic = shost_priv(sdev->host);
	int qsz = 0;

	qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH);
	if (qsz < sdev->queue_depth)
		atomic64_inc(&snic->s_stats.misc.qsz_rampdown);
	else if (qsz > sdev->queue_depth)
		atomic64_inc(&snic->s_stats.misc.qsz_rampup);

	atomic64_set(&snic->s_stats.misc.last_qsz, sdev->queue_depth);

	scsi_change_queue_depth(sdev, qsz);

	return sdev->queue_depth;
}

static struct scsi_host_template snic_host_template = {
	.module = THIS_MODULE,
	.name = SNIC_DRV_NAME,
	.queuecommand = snic_queuecommand,
	.eh_abort_handler = snic_abort_cmd,
	.eh_device_reset_handler = snic_device_reset,
	.eh_host_reset_handler = snic_host_reset,
	.slave_alloc = snic_slave_alloc,
	.slave_configure = snic_slave_configure,
	.change_queue_depth = snic_change_queue_depth,
	.this_id = -1,
	.cmd_per_lun = SNIC_DFLT_QUEUE_DEPTH,
	.can_queue = SNIC_MAX_IO_REQ,
	.use_clustering = ENABLE_CLUSTERING,
	.sg_tablesize = SNIC_MAX_SG_DESC_CNT,
	.max_sectors = 0x800,
	.shost_attrs = snic_attrs,
	.track_queue_depth = 1,
	.cmd_size = sizeof(struct snic_internal_io_state),
	.proc_name = "snic_scsi",
};

/*
 * snic_handle_link_event : Handles link events such as link up/down/error
 */
void
snic_handle_link_event(struct snic *snic)
{
	unsigned long flags;

	spin_lock_irqsave(&snic->snic_lock, flags);
	if (snic->stop_link_events) {
		spin_unlock_irqrestore(&snic->snic_lock, flags);

		return;
	}
	spin_unlock_irqrestore(&snic->snic_lock, flags);

	queue_work(snic_glob->event_q, &snic->link_work);
} /* end of snic_handle_link_event */

/*
 * snic_notify_set : sets notification area
 * This notification area is to receive events from fw
 * Note: snic supports only MSIX interrupts, in which we can just call
 *  svnic_dev_notify_set directly
 */
static int
snic_notify_set(struct snic *snic)
{
	int ret = 0;
	enum vnic_dev_intr_mode intr_mode;

	intr_mode = svnic_dev_get_intr_mode(snic->vdev);

	if (intr_mode == VNIC_DEV_INTR_MODE_MSIX) {
		ret = svnic_dev_notify_set(snic->vdev, SNIC_MSIX_ERR_NOTIFY);
	} else {
		SNIC_HOST_ERR(snic->shost,
			      "Interrupt mode should be setup before devcmd notify set %d\n",
			      intr_mode);
		ret = -1;
	}

	return ret;
} /* end of snic_notify_set */

/*
 * snic_dev_wait : polls vnic open status.
 */
static int
snic_dev_wait(struct vnic_dev *vdev,
		int (*start)(struct vnic_dev *, int),
		int (*finished)(struct vnic_dev *, int *),
		int arg)
{
	unsigned long time;
	int ret, done;
	int retry_cnt = 0;

	ret = start(vdev, arg);
	if (ret)
		return ret;

	/*
	 * Wait for func to complete...2 seconds max.
	 *
	 * Sometimes schedule_timeout_uninterruptible take long	time
	 * to wakeup, which results skipping retry. The retry counter
	 * ensures to retry at least two times.
	 */
	time = jiffies + (HZ * 2);
	do {
		ret = finished(vdev, &done);
		if (ret)
			return ret;

		if (done)
			return 0;
		schedule_timeout_uninterruptible(HZ/10);
		++retry_cnt;
	} while (time_after(time, jiffies) || (retry_cnt < 3));

	return -ETIMEDOUT;
} /* end of snic_dev_wait */

/*
 * snic_cleanup: called by snic_remove
 * Stops the snic device, masks all interrupts, Completed CQ entries are
 * drained. Posted WQ/RQ/Copy-WQ entries are cleanup
 */
static int
snic_cleanup(struct snic *snic)
{
	unsigned int i;
	int ret;

	svnic_dev_disable(snic->vdev);
	for (i = 0; i < snic->intr_count; i++)
		svnic_intr_mask(&snic->intr[i]);

	for (i = 0; i < snic->wq_count; i++) {
		ret = svnic_wq_disable(&snic->wq[i]);
		if (ret)
			return ret;
	}

	/* Clean up completed IOs */
	snic_fwcq_cmpl_handler(snic, -1);

	snic_wq_cmpl_handler(snic, -1);

	/* Clean up the IOs that have not completed */
	for (i = 0; i < snic->wq_count; i++)
		svnic_wq_clean(&snic->wq[i], snic_free_wq_buf);

	for (i = 0; i < snic->cq_count; i++)
		svnic_cq_clean(&snic->cq[i]);

	for (i = 0; i < snic->intr_count; i++)
		svnic_intr_clean(&snic->intr[i]);

	/* Cleanup snic specific requests */
	snic_free_all_untagged_reqs(snic);

	/* Cleanup Pending SCSI commands */
	snic_shutdown_scsi_cleanup(snic);

	for (i = 0; i < SNIC_REQ_MAX_CACHES; i++)
		mempool_destroy(snic->req_pool[i]);

	return 0;
} /* end of snic_cleanup */


static void
snic_iounmap(struct snic *snic)
{
	if (snic->bar0.vaddr)
		iounmap(snic->bar0.vaddr);
}

/*
 * snic_vdev_open_done : polls for svnic_dev_open cmd completion.
 */
static int
snic_vdev_open_done(struct vnic_dev *vdev, int *done)
{
	struct snic *snic = svnic_dev_priv(vdev);
	int ret;
	int nretries = 5;

	do {
		ret = svnic_dev_open_done(vdev, done);
		if (ret == 0)
			break;

		SNIC_HOST_INFO(snic->shost, "VNIC_DEV_OPEN Timedout.\n");
	} while (nretries--);

	return ret;
} /* end of snic_vdev_open_done */

/*
 * snic_add_host : registers scsi host with ML
 */
static int
snic_add_host(struct Scsi_Host *shost, struct pci_dev *pdev)
{
	int ret = 0;

	ret = scsi_add_host(shost, &pdev->dev);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "snic: scsi_add_host failed. %d\n",
			      ret);

		return ret;
	}

	SNIC_BUG_ON(shost->work_q != NULL);
	snprintf(shost->work_q_name, sizeof(shost->work_q_name), "scsi_wq_%d",
		 shost->host_no);
	shost->work_q = create_singlethread_workqueue(shost->work_q_name);
	if (!shost->work_q) {
		SNIC_HOST_ERR(shost, "Failed to Create ScsiHost wq.\n");

		ret = -ENOMEM;
	}

	return ret;
} /* end of snic_add_host */

static void
snic_del_host(struct Scsi_Host *shost)
{
	if (!shost->work_q)
		return;

	destroy_workqueue(shost->work_q);
	shost->work_q = NULL;
	scsi_remove_host(shost);
}

int
snic_get_state(struct snic *snic)
{
	return atomic_read(&snic->state);
}

void
snic_set_state(struct snic *snic, enum snic_state state)
{
	SNIC_HOST_INFO(snic->shost, "snic state change from %s to %s\n",
		       snic_state_to_str(snic_get_state(snic)),
		       snic_state_to_str(state));

	atomic_set(&snic->state, state);
}

/*
 * snic_probe : Initialize the snic interface.
 */
static int
snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct Scsi_Host *shost;
	struct snic *snic;
	mempool_t *pool;
	unsigned long flags;
	u32 max_ios = 0;
	int ret, i;

	/* Device Information */
	SNIC_INFO("snic device %4x:%4x:%4x:%4x: ",
		  pdev->vendor, pdev->device, pdev->subsystem_vendor,
		  pdev->subsystem_device);

	SNIC_INFO("snic device bus %x: slot %x: fn %x\n",
		  pdev->bus->number, PCI_SLOT(pdev->devfn),
		  PCI_FUNC(pdev->devfn));

	/*
	 * Allocate SCSI Host and setup association between host, and snic
	 */
	shost = scsi_host_alloc(&snic_host_template, sizeof(struct snic));
	if (!shost) {
		SNIC_ERR("Unable to alloc scsi_host\n");
		ret = -ENOMEM;

		goto prob_end;
	}
	snic = shost_priv(shost);
	snic->shost = shost;

	snprintf(snic->name, sizeof(snic->name) - 1, "%s%d", SNIC_DRV_NAME,
		 shost->host_no);

	SNIC_HOST_INFO(shost,
		       "snic%d = %p shost = %p device bus %x: slot %x: fn %x\n",
		       shost->host_no, snic, shost, pdev->bus->number,
		       PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	/* Per snic debugfs init */
	ret = snic_stats_debugfs_init(snic);
	if (ret) {
		SNIC_HOST_ERR(snic->shost,
			      "Failed to initialize debugfs stats\n");
		snic_stats_debugfs_remove(snic);
	}
#endif

	/* Setup PCI Resources */
	pci_set_drvdata(pdev, snic);
	snic->pdev = pdev;

	ret = pci_enable_device(pdev);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Cannot enable PCI Resources, aborting : %d\n",
			      ret);

		goto err_free_snic;
	}

	ret = pci_request_regions(pdev, SNIC_DRV_NAME);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Cannot obtain PCI Resources, aborting : %d\n",
			      ret);

		goto err_pci_disable;
	}

	pci_set_master(pdev);

	/*
	 * Query PCI Controller on system for DMA addressing
	 * limitation for the device. Try 43-bit first, and
	 * fail to 32-bit.
	 */
	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(43));
	if (ret) {
		ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
		if (ret) {
			SNIC_HOST_ERR(shost,
				      "No Usable DMA Configuration, aborting %d\n",
				      ret);

			goto err_rel_regions;
		}

		ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
		if (ret) {
			SNIC_HOST_ERR(shost,
				      "Unable to obtain 32-bit DMA for consistent allocations, aborting: %d\n",
				      ret);

			goto err_rel_regions;
		}
	} else {
		ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(43));
		if (ret) {
			SNIC_HOST_ERR(shost,
				      "Unable to obtain 43-bit DMA for consistent allocations. aborting: %d\n",
				      ret);

			goto err_rel_regions;
		}
	}


	/* Map vNIC resources from BAR0 */
	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
		SNIC_HOST_ERR(shost, "BAR0 not memory mappable aborting.\n");

		ret = -ENODEV;
		goto err_rel_regions;
	}

	snic->bar0.vaddr = pci_iomap(pdev, 0, 0);
	if (!snic->bar0.vaddr) {
		SNIC_HOST_ERR(shost,
			      "Cannot memory map BAR0 res hdr aborting.\n");

		ret = -ENODEV;
		goto err_rel_regions;
	}

	snic->bar0.bus_addr = pci_resource_start(pdev, 0);
	snic->bar0.len = pci_resource_len(pdev, 0);
	SNIC_BUG_ON(snic->bar0.bus_addr == 0);

	/* Devcmd2 Resource Allocation and Initialization */
	snic->vdev = svnic_dev_alloc_discover(NULL, snic, pdev, &snic->bar0, 1);
	if (!snic->vdev) {
		SNIC_HOST_ERR(shost, "vNIC Resource Discovery Failed.\n");

		ret = -ENODEV;
		goto err_iounmap;
	}

	ret = svnic_dev_cmd_init(snic->vdev, 0);
	if (ret) {
		SNIC_HOST_INFO(shost, "Devcmd2 Init Failed. err = %d\n", ret);

		goto err_vnic_unreg;
	}

	ret = snic_dev_wait(snic->vdev, svnic_dev_open, snic_vdev_open_done, 0);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "vNIC dev open failed, aborting. %d\n",
			      ret);

		goto err_vnic_unreg;
	}

	ret = svnic_dev_init(snic->vdev, 0);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "vNIC dev init failed. aborting. %d\n",
			      ret);

		goto err_dev_close;
	}

	/* Get vNIC information */
	ret = snic_get_vnic_config(snic);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Get vNIC configuration failed, aborting. %d\n",
			      ret);

		goto err_dev_close;
	}

	/* Configure Maximum Outstanding IO reqs */
	max_ios = snic->config.io_throttle_count;
	if (max_ios != SNIC_UCSM_DFLT_THROTTLE_CNT_BLD)
		shost->can_queue = min_t(u32, SNIC_MAX_IO_REQ,
					 max_t(u32, SNIC_MIN_IO_REQ, max_ios));

	snic->max_tag_id = shost->can_queue;

	shost->max_lun = snic->config.luns_per_tgt;
	shost->max_id = SNIC_MAX_TARGET;

	shost->max_cmd_len = MAX_COMMAND_SIZE; /*defined in scsi_cmnd.h*/

	snic_get_res_counts(snic);

	/*
	 * Assumption: Only MSIx is supported
	 */
	ret = snic_set_intr_mode(snic);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Failed to set intr mode aborting. %d\n",
			      ret);

		goto err_dev_close;
	}

	ret = snic_alloc_vnic_res(snic);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Failed to alloc vNIC resources aborting. %d\n",
			      ret);

		goto err_clear_intr;
	}

	/* Initialize specific lists */
	INIT_LIST_HEAD(&snic->list);

	/*
	 * spl_cmd_list for maintaining snic specific cmds
	 * such as EXCH_VER_REQ, REPORT_TARGETS etc
	 */
	INIT_LIST_HEAD(&snic->spl_cmd_list);
	spin_lock_init(&snic->spl_cmd_lock);

	/* initialize all snic locks */
	spin_lock_init(&snic->snic_lock);

	for (i = 0; i < SNIC_WQ_MAX; i++)
		spin_lock_init(&snic->wq_lock[i]);

	for (i = 0; i < SNIC_IO_LOCKS; i++)
		spin_lock_init(&snic->io_req_lock[i]);

	pool = mempool_create_slab_pool(2,
				snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
	if (!pool) {
		SNIC_HOST_ERR(shost, "dflt sgl pool creation failed\n");

		goto err_free_res;
	}

	snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL] = pool;

	pool = mempool_create_slab_pool(2,
				snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
	if (!pool) {
		SNIC_HOST_ERR(shost, "max sgl pool creation failed\n");

		goto err_free_dflt_sgl_pool;
	}

	snic->req_pool[SNIC_REQ_CACHE_MAX_SGL] = pool;

	pool = mempool_create_slab_pool(2,
				snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
	if (!pool) {
		SNIC_HOST_ERR(shost, "snic tmreq info pool creation failed.\n");

		goto err_free_max_sgl_pool;
	}

	snic->req_pool[SNIC_REQ_TM_CACHE] = pool;

	/* Initialize snic state */
	atomic_set(&snic->state, SNIC_INIT);

	atomic_set(&snic->ios_inflight, 0);

	/* Setup notification buffer area */
	ret = snic_notify_set(snic);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Failed to alloc notify buffer aborting. %d\n",
			      ret);

		goto err_free_tmreq_pool;
	}

	spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
	list_add_tail(&snic->list, &snic_glob->snic_list);
	spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);

	snic_disc_init(&snic->disc);
	INIT_WORK(&snic->tgt_work, snic_handle_tgt_disc);
	INIT_WORK(&snic->disc_work, snic_handle_disc);
	INIT_WORK(&snic->link_work, snic_handle_link);

	/* Enable all queues */
	for (i = 0; i < snic->wq_count; i++)
		svnic_wq_enable(&snic->wq[i]);

	ret = svnic_dev_enable_wait(snic->vdev);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "vNIC dev enable failed w/ error %d\n",
			      ret);

		goto err_vdev_enable;
	}

	ret = snic_request_intr(snic);
	if (ret) {
		SNIC_HOST_ERR(shost, "Unable to request irq. %d\n", ret);

		goto err_req_intr;
	}

	for (i = 0; i < snic->intr_count; i++)
		svnic_intr_unmask(&snic->intr[i]);

	/* Get snic params */
	ret = snic_get_conf(snic);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Failed to get snic io config from FW w err %d\n",
			      ret);

		goto err_get_conf;
	}

	/*
	 * Initialization done with PCI system, hardware, firmware.
	 * Add shost to SCSI
	 */
	ret = snic_add_host(shost, pdev);
	if (ret) {
		SNIC_HOST_ERR(shost,
			      "Adding scsi host Failed ... exiting. %d\n",
			      ret);

		goto err_get_conf;
	}

	snic_set_state(snic, SNIC_ONLINE);

	ret = snic_disc_start(snic);
	if (ret) {
		SNIC_HOST_ERR(shost, "snic_probe:Discovery Failed w err = %d\n",
			      ret);

		goto err_get_conf;
	}

	SNIC_HOST_INFO(shost, "SNIC Device Probe Successful.\n");

	return 0;

err_get_conf:
	snic_free_all_untagged_reqs(snic);

	for (i = 0; i < snic->intr_count; i++)
		svnic_intr_mask(&snic->intr[i]);

	snic_free_intr(snic);

err_req_intr:
	svnic_dev_disable(snic->vdev);

err_vdev_enable:
	svnic_dev_notify_unset(snic->vdev);

	for (i = 0; i < snic->wq_count; i++) {
		int rc = 0;

		rc = svnic_wq_disable(&snic->wq[i]);
		if (rc) {
			SNIC_HOST_ERR(shost,
				      "WQ Disable Failed w/ err = %d\n", rc);

			 break;
		}
	}
	snic_del_host(snic->shost);

err_free_tmreq_pool:
	mempool_destroy(snic->req_pool[SNIC_REQ_TM_CACHE]);

err_free_max_sgl_pool:
	mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_MAX_SGL]);

err_free_dflt_sgl_pool:
	mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL]);

err_free_res:
	snic_free_vnic_res(snic);

err_clear_intr:
	snic_clear_intr_mode(snic);

err_dev_close:
	svnic_dev_close(snic->vdev);

err_vnic_unreg:
	svnic_dev_unregister(snic->vdev);

err_iounmap:
	snic_iounmap(snic);

err_rel_regions:
	pci_release_regions(pdev);

err_pci_disable:
	pci_disable_device(pdev);

err_free_snic:
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	snic_stats_debugfs_remove(snic);
#endif
	scsi_host_put(shost);
	pci_set_drvdata(pdev, NULL);

prob_end:
	SNIC_INFO("sNIC device : bus %d: slot %d: fn %d Registration Failed.\n",
		  pdev->bus->number, PCI_SLOT(pdev->devfn),
		  PCI_FUNC(pdev->devfn));

	return ret;
} /* end of snic_probe */


/*
 * snic_remove : invoked on unbinding the interface to cleanup the
 * resources allocated in snic_probe on initialization.
 */
static void
snic_remove(struct pci_dev *pdev)
{
	struct snic *snic = pci_get_drvdata(pdev);
	unsigned long flags;

	if (!snic) {
		SNIC_INFO("sNIC dev: bus %d slot %d fn %d snic inst is null.\n",
			  pdev->bus->number, PCI_SLOT(pdev->devfn),
			  PCI_FUNC(pdev->devfn));

		return;
	}

	/*
	 * Mark state so that the workqueue thread stops forwarding
	 * received frames and link events. ISR and other threads
	 * that can queue work items will also stop creating work
	 * items on the snic workqueue
	 */
	snic_set_state(snic, SNIC_OFFLINE);
	spin_lock_irqsave(&snic->snic_lock, flags);
	snic->stop_link_events = 1;
	spin_unlock_irqrestore(&snic->snic_lock, flags);

	flush_workqueue(snic_glob->event_q);
	snic_disc_term(snic);

	spin_lock_irqsave(&snic->snic_lock, flags);
	snic->in_remove = 1;
	spin_unlock_irqrestore(&snic->snic_lock, flags);

	/*
	 * This stops the snic device, masks all interrupts, Completed
	 * CQ entries are drained. Posted WQ/RQ/Copy-WQ entries are
	 * cleanup
	 */
	snic_cleanup(snic);

	spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
	list_del(&snic->list);
	spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);

	snic_tgt_del_all(snic);
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	snic_stats_debugfs_remove(snic);
#endif
	snic_del_host(snic->shost);

	svnic_dev_notify_unset(snic->vdev);
	snic_free_intr(snic);
	snic_free_vnic_res(snic);
	snic_clear_intr_mode(snic);
	svnic_dev_close(snic->vdev);
	svnic_dev_unregister(snic->vdev);
	snic_iounmap(snic);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);

	/* this frees Scsi_Host and snic memory (continuous chunk) */
	scsi_host_put(snic->shost);
} /* end of snic_remove */


struct snic_global *snic_glob;

/*
 * snic_global_data_init: Initialize SNIC Global Data
 * Notes: All the global lists, variables should be part of global data
 * this helps in debugging.
 */
static int
snic_global_data_init(void)
{
	int ret = 0;
	struct kmem_cache *cachep;
	ssize_t len = 0;

	snic_glob = kzalloc(sizeof(*snic_glob), GFP_KERNEL);

	if (!snic_glob) {
		SNIC_ERR("Failed to allocate Global Context.\n");

		ret = -ENOMEM;
		goto gdi_end;
	}

#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	/* Debugfs related Initialization */
	/* Create debugfs entries for snic */
	ret = snic_debugfs_init();
	if (ret < 0) {
		SNIC_ERR("Failed to create sysfs dir for tracing and stats.\n");
		snic_debugfs_term();
		/* continue even if it fails */
	}

	/* Trace related Initialization */
	/* Allocate memory for trace buffer */
	ret = snic_trc_init();
	if (ret < 0) {
		SNIC_ERR("Trace buffer init failed, SNIC tracing disabled\n");
		snic_trc_free();
		/* continue even if it fails */
	}

#endif
	INIT_LIST_HEAD(&snic_glob->snic_list);
	spin_lock_init(&snic_glob->snic_list_lock);

	/* Create a cache for allocation of snic_host_req+default size ESGLs */
	len = sizeof(struct snic_req_info);
	len += sizeof(struct snic_host_req) + sizeof(struct snic_dflt_sgl);
	cachep = kmem_cache_create("snic_req_dfltsgl", len, SNIC_SG_DESC_ALIGN,
				   SLAB_HWCACHE_ALIGN, NULL);
	if (!cachep) {
		SNIC_ERR("Failed to create snic default sgl slab\n");
		ret = -ENOMEM;

		goto err_dflt_req_slab;
	}
	snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL] = cachep;

	/* Create a cache for allocation of max size Extended SGLs */
	len = sizeof(struct snic_req_info);
	len += sizeof(struct snic_host_req) + sizeof(struct snic_max_sgl);
	cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
				   SLAB_HWCACHE_ALIGN, NULL);
	if (!cachep) {
		SNIC_ERR("Failed to create snic max sgl slab\n");
		ret = -ENOMEM;

		goto err_max_req_slab;
	}
	snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL] = cachep;

	len = sizeof(struct snic_host_req);
	cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
				   SLAB_HWCACHE_ALIGN, NULL);
	if (!cachep) {
		SNIC_ERR("Failed to create snic tm req slab\n");
		ret = -ENOMEM;

		goto err_tmreq_slab;
	}
	snic_glob->req_cache[SNIC_REQ_TM_CACHE] = cachep;

	/* snic_event queue */
	snic_glob->event_q = create_singlethread_workqueue("snic_event_wq");
	if (!snic_glob->event_q) {
		SNIC_ERR("snic event queue create failed\n");
		ret = -ENOMEM;

		goto err_eventq;
	}

	return ret;

err_eventq:
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);

err_tmreq_slab:
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);

err_max_req_slab:
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);

err_dflt_req_slab:
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	snic_trc_free();
	snic_debugfs_term();
#endif
	kfree(snic_glob);
	snic_glob = NULL;

gdi_end:
	return ret;
} /* end of snic_glob_init */

/*
 * snic_global_data_cleanup : Frees SNIC Global Data
 */
static void
snic_global_data_cleanup(void)
{
	SNIC_BUG_ON(snic_glob == NULL);

	destroy_workqueue(snic_glob->event_q);
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
	kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);

#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	/* Freeing Trace Resources */
	snic_trc_free();

	/* Freeing Debugfs Resources */
	snic_debugfs_term();
#endif
	kfree(snic_glob);
	snic_glob = NULL;
} /* end of snic_glob_cleanup */

static struct pci_driver snic_driver = {
	.name = SNIC_DRV_NAME,
	.id_table = snic_id_table,
	.probe = snic_probe,
	.remove = snic_remove,
};

static int __init
snic_init_module(void)
{
	int ret = 0;

#ifndef __x86_64__
	SNIC_INFO("SNIC Driver is supported only for x86_64 platforms!\n");
	add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
#endif

	SNIC_INFO("%s, ver %s\n", SNIC_DRV_DESCRIPTION, SNIC_DRV_VERSION);

	ret = snic_global_data_init();
	if (ret) {
		SNIC_ERR("Failed to Initialize Global Data.\n");

		return ret;
	}

	ret = pci_register_driver(&snic_driver);
	if (ret < 0) {
		SNIC_ERR("PCI driver register error\n");

		goto err_pci_reg;
	}

	return ret;

err_pci_reg:
	snic_global_data_cleanup();

	return ret;
}

static void __exit
snic_cleanup_module(void)
{
	pci_unregister_driver(&snic_driver);
	snic_global_data_cleanup();
}

module_init(snic_init_module);
module_exit(snic_cleanup_module);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(SNIC_DRV_DESCRIPTION);
MODULE_VERSION(SNIC_DRV_VERSION);
MODULE_DEVICE_TABLE(pci, snic_id_table);
MODULE_AUTHOR("Narsimhulu Musini <nmusini@cisco.com>, "
	      "Sesidhar Baddela <sebaddel@cisco.com>");
OpenPOWER on IntegriCloud