aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/scsi/zfcp_scsi.c
blob: 6bd2dbc4c31606d5019fb1e76d92ef88583a2140 (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
/*
 * zfcp device driver
 *
 * Interface to Linux SCSI midlayer.
 *
 * Copyright IBM Corporation 2002, 2010
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/types.h>
#include <linux/slab.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/scsi_eh.h>
#include <asm/atomic.h>
#include "zfcp_ext.h"
#include "zfcp_dbf.h"
#include "zfcp_fc.h"
#include "zfcp_reqlist.h"

static unsigned int default_depth = 32;
module_param_named(queue_depth, default_depth, uint, 0600);
MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");

static bool enable_dif;

#ifdef CONFIG_ZFCP_DIF
module_param_named(dif, enable_dif, bool, 0600);
MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
#endif

static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
					int reason)
{
	switch (reason) {
	case SCSI_QDEPTH_DEFAULT:
		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
		break;
	case SCSI_QDEPTH_QFULL:
		scsi_track_queue_full(sdev, depth);
		break;
	case SCSI_QDEPTH_RAMP_UP:
		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
		break;
	default:
		return -EOPNOTSUPP;
	}
	return sdev->queue_depth;
}

static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);

	zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
	put_device(&zfcp_sdev->port->dev);
}

static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
{
	if (sdp->tagged_supported)
		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
	else
		scsi_adjust_queue_depth(sdp, 0, 1);
	return 0;
}

static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) scpnt->device->host->hostdata[0];

	set_host_byte(scpnt, result);
	zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
	scpnt->scsi_done(scpnt);
}

static int zfcp_scsi_queuecommand_lck(struct scsi_cmnd *scpnt,
				  void (*done) (struct scsi_cmnd *))
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
	int    status, scsi_result, ret;

	/* reset the status for this request */
	scpnt->result = 0;
	scpnt->host_scribble = NULL;
	scpnt->scsi_done = done;

	scsi_result = fc_remote_port_chkready(rport);
	if (unlikely(scsi_result)) {
		scpnt->result = scsi_result;
		zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt);
		scpnt->scsi_done(scpnt);
		return 0;
	}

	status = atomic_read(&zfcp_sdev->status);
	if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
		     !(atomic_read(&zfcp_sdev->port->status) &
		       ZFCP_STATUS_COMMON_ERP_FAILED)) {
		/* only LUN access denied, but port is good
		 * not covered by FC transport, have to fail here */
		zfcp_scsi_command_fail(scpnt, DID_ERROR);
		return 0;
	}

	if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
		/* This could be either
		 * open LUN pending: this is temporary, will result in
		 *	open LUN or ERP_FAILED, so retry command
		 * call to rport_delete pending: mimic retry from
		 * 	fc_remote_port_chkready until rport is BLOCKED
		 */
		zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
		return 0;
	}

	ret = zfcp_fsf_fcp_cmnd(scpnt);
	if (unlikely(ret == -EBUSY))
		return SCSI_MLQUEUE_DEVICE_BUSY;
	else if (unlikely(ret < 0))
		return SCSI_MLQUEUE_HOST_BUSY;

	return ret;
}

static DEF_SCSI_QCMD(zfcp_scsi_queuecommand)

static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) sdev->host->hostdata[0];
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
	struct zfcp_port *port;
	struct zfcp_unit *unit;

	port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
	if (!port)
		return -ENXIO;

	unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
	if (unit)
		put_device(&unit->dev);

	if (!unit && !(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
		put_device(&port->dev);
		return -ENXIO;
	}

	zfcp_sdev->port = port;
	zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
	spin_lock_init(&zfcp_sdev->latencies.lock);

	zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_lun_reopen(sdev, 0, "scsla_1", NULL);
	zfcp_erp_wait(port->adapter);

	return 0;
}

static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
	struct Scsi_Host *scsi_host = scpnt->device->host;
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) scsi_host->hostdata[0];
	struct zfcp_fsf_req *old_req, *abrt_req;
	unsigned long flags;
	unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
	int retval = SUCCESS, ret;
	int retry = 3;
	char *dbf_tag;

	/* avoid race condition between late normal completion and abort */
	write_lock_irqsave(&adapter->abort_lock, flags);

	old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
	if (!old_req) {
		write_unlock_irqrestore(&adapter->abort_lock, flags);
		zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
				    old_reqid);
		return FAILED; /* completion could be in progress */
	}
	old_req->data = NULL;

	/* don't access old fsf_req after releasing the abort_lock */
	write_unlock_irqrestore(&adapter->abort_lock, flags);

	while (retry--) {
		abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
		if (abrt_req)
			break;

		zfcp_erp_wait(adapter);
		ret = fc_block_scsi_eh(scpnt);
		if (ret)
			return ret;
		if (!(atomic_read(&adapter->status) &
		      ZFCP_STATUS_COMMON_RUNNING)) {
			zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
					    old_reqid);
			return SUCCESS;
		}
	}
	if (!abrt_req)
		return FAILED;

	wait_for_completion(&abrt_req->completion);

	if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
		dbf_tag = "okay";
	else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
		dbf_tag = "lte2";
	else {
		dbf_tag = "fail";
		retval = FAILED;
	}
	zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
	zfcp_fsf_req_free(abrt_req);
	return retval;
}

static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	struct zfcp_fsf_req *fsf_req = NULL;
	int retval = SUCCESS, ret;
	int retry = 3;

	while (retry--) {
		fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
		if (fsf_req)
			break;

		zfcp_erp_wait(adapter);
		ret = fc_block_scsi_eh(scpnt);
		if (ret)
			return ret;

		if (!(atomic_read(&adapter->status) &
		      ZFCP_STATUS_COMMON_RUNNING)) {
			zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
			return SUCCESS;
		}
	}
	if (!fsf_req)
		return FAILED;

	wait_for_completion(&fsf_req->completion);

	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
		zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
		retval = FAILED;
	} else
		zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);

	zfcp_fsf_req_free(fsf_req);
	return retval;
}

static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
}

static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
}

static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	int ret;

	zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
	zfcp_erp_wait(adapter);
	ret = fc_block_scsi_eh(scpnt);
	if (ret)
		return ret;

	return SUCCESS;
}

int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
{
	struct ccw_dev_id dev_id;

	if (adapter->scsi_host)
		return 0;

	ccw_device_get_id(adapter->ccw_device, &dev_id);
	/* register adapter as SCSI host with mid layer of SCSI stack */
	adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
					     sizeof (struct zfcp_adapter *));
	if (!adapter->scsi_host) {
		dev_err(&adapter->ccw_device->dev,
			"Registering the FCP device with the "
			"SCSI stack failed\n");
		return -EIO;
	}

	/* tell the SCSI stack some characteristics of this adapter */
	adapter->scsi_host->max_id = 511;
	adapter->scsi_host->max_lun = 0xFFFFFFFF;
	adapter->scsi_host->max_channel = 0;
	adapter->scsi_host->unique_id = dev_id.devno;
	adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
	adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;

	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;

	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
		scsi_host_put(adapter->scsi_host);
		return -EIO;
	}

	return 0;
}

void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
{
	struct Scsi_Host *shost;
	struct zfcp_port *port;

	shost = adapter->scsi_host;
	if (!shost)
		return;

	read_lock_irq(&adapter->port_list_lock);
	list_for_each_entry(port, &adapter->port_list, list)
		port->rport = NULL;
	read_unlock_irq(&adapter->port_list_lock);

	fc_remove_host(shost);
	scsi_remove_host(shost);
	scsi_host_put(shost);
	adapter->scsi_host = NULL;

	return;
}

static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
{
	struct fc_host_statistics *fc_stats;

	if (!adapter->fc_stats) {
		fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
		if (!fc_stats)
			return NULL;
		adapter->fc_stats = fc_stats; /* freed in adapter_release */
	}
	memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
	return adapter->fc_stats;
}

static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
				      struct fsf_qtcb_bottom_port *data,
				      struct fsf_qtcb_bottom_port *old)
{
	fc_stats->seconds_since_last_reset =
		data->seconds_since_last_reset - old->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames - old->tx_frames;
	fc_stats->tx_words = data->tx_words - old->tx_words;
	fc_stats->rx_frames = data->rx_frames - old->rx_frames;
	fc_stats->rx_words = data->rx_words - old->rx_words;
	fc_stats->lip_count = data->lip - old->lip;
	fc_stats->nos_count = data->nos - old->nos;
	fc_stats->error_frames = data->error_frames - old->error_frames;
	fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
	fc_stats->link_failure_count = data->link_failure - old->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
	fc_stats->loss_of_signal_count =
		data->loss_of_signal - old->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count =
		data->psp_error_counts - old->psp_error_counts;
	fc_stats->invalid_tx_word_count =
		data->invalid_tx_words - old->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
	fc_stats->fcp_input_requests =
		data->input_requests - old->input_requests;
	fc_stats->fcp_output_requests =
		data->output_requests - old->output_requests;
	fc_stats->fcp_control_requests =
		data->control_requests - old->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
}

static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
				   struct fsf_qtcb_bottom_port *data)
{
	fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames;
	fc_stats->tx_words = data->tx_words;
	fc_stats->rx_frames = data->rx_frames;
	fc_stats->rx_words = data->rx_words;
	fc_stats->lip_count = data->lip;
	fc_stats->nos_count = data->nos;
	fc_stats->error_frames = data->error_frames;
	fc_stats->dumped_frames = data->dumped_frames;
	fc_stats->link_failure_count = data->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync;
	fc_stats->loss_of_signal_count = data->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
	fc_stats->invalid_tx_word_count = data->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs;
	fc_stats->fcp_input_requests = data->input_requests;
	fc_stats->fcp_output_requests = data->output_requests;
	fc_stats->fcp_control_requests = data->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb;
}

static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
{
	struct zfcp_adapter *adapter;
	struct fc_host_statistics *fc_stats;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)host->hostdata[0];
	fc_stats = zfcp_init_fc_host_stats(adapter);
	if (!fc_stats)
		return NULL;

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

	ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
	if (ret) {
		kfree(data);
		return NULL;
	}

	if (adapter->stats_reset &&
	    ((jiffies/HZ - adapter->stats_reset) <
	     data->seconds_since_last_reset))
		zfcp_adjust_fc_host_stats(fc_stats, data,
					  adapter->stats_reset_data);
	else
		zfcp_set_fc_host_stats(fc_stats, data);

	kfree(data);
	return fc_stats;
}

static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)shost->hostdata[0];
	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return;

	ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
	if (ret)
		kfree(data);
	else {
		adapter->stats_reset = jiffies/HZ;
		kfree(adapter->stats_reset_data);
		adapter->stats_reset_data = data; /* finally freed in
						     adapter_release */
	}
}

static void zfcp_get_host_port_state(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *)shost->hostdata[0];
	int status = atomic_read(&adapter->status);

	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
	    !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
	else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
		fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
	else
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
}

static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
	rport->dev_loss_tmo = timeout;
}

/**
 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 * @rport: The FC rport where to teminate I/O
 *
 * Abort all pending SCSI commands for a port by closing the
 * port. Using a reopen avoids a conflict with a shutdown
 * overwriting a reopen. The "forced" ensures that a disappeared port
 * is not opened again as valid due to the cached plogi data in
 * non-NPIV mode.
 */
static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
{
	struct zfcp_port *port;
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *)shost->hostdata[0];

	port = zfcp_get_port_by_wwpn(adapter, rport->port_name);

	if (port) {
		zfcp_erp_port_forced_reopen(port, 0, "sctrpi1", NULL);
		put_device(&port->dev);
	}
}

static void zfcp_scsi_rport_register(struct zfcp_port *port)
{
	struct fc_rport_identifiers ids;
	struct fc_rport *rport;

	if (port->rport)
		return;

	ids.node_name = port->wwnn;
	ids.port_name = port->wwpn;
	ids.port_id = port->d_id;
	ids.roles = FC_RPORT_ROLE_FCP_TARGET;

	rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
	if (!rport) {
		dev_err(&port->adapter->ccw_device->dev,
			"Registering port 0x%016Lx failed\n",
			(unsigned long long)port->wwpn);
		return;
	}

	rport->maxframe_size = port->maxframe_size;
	rport->supported_classes = port->supported_classes;
	port->rport = rport;
	port->starget_id = rport->scsi_target_id;

	zfcp_unit_queue_scsi_scan(port);
}

static void zfcp_scsi_rport_block(struct zfcp_port *port)
{
	struct fc_rport *rport = port->rport;

	if (rport) {
		fc_remote_port_delete(rport);
		port->rport = NULL;
	}
}

void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
{
	get_device(&port->dev);
	port->rport_task = RPORT_ADD;

	if (!queue_work(port->adapter->work_queue, &port->rport_work))
		put_device(&port->dev);
}

void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
{
	get_device(&port->dev);
	port->rport_task = RPORT_DEL;

	if (port->rport && queue_work(port->adapter->work_queue,
				      &port->rport_work))
		return;

	put_device(&port->dev);
}

void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
{
	unsigned long flags;
	struct zfcp_port *port;

	read_lock_irqsave(&adapter->port_list_lock, flags);
	list_for_each_entry(port, &adapter->port_list, list)
		zfcp_scsi_schedule_rport_block(port);
	read_unlock_irqrestore(&adapter->port_list_lock, flags);
}

void zfcp_scsi_rport_work(struct work_struct *work)
{
	struct zfcp_port *port = container_of(work, struct zfcp_port,
					      rport_work);

	while (port->rport_task) {
		if (port->rport_task == RPORT_ADD) {
			port->rport_task = RPORT_NONE;
			zfcp_scsi_rport_register(port);
		} else {
			port->rport_task = RPORT_NONE;
			zfcp_scsi_rport_block(port);
		}
	}

	put_device(&port->dev);
}

/**
 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 */
void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
{
	unsigned int mask = 0;
	unsigned int data_div;
	struct Scsi_Host *shost = adapter->scsi_host;

	data_div = atomic_read(&adapter->status) &
		   ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;

	if (enable_dif &&
	    adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
		mask |= SHOST_DIF_TYPE1_PROTECTION;

	if (enable_dif && data_div &&
	    adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
		mask |= SHOST_DIX_TYPE1_PROTECTION;
		scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
		shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
		shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
		shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
	}

	scsi_host_set_prot(shost, mask);
}

/**
 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 * @scmd: The SCSI command to report the error for
 * @ascq: The ASCQ to put in the sense buffer
 *
 * See the error handling in sd_done for the sense codes used here.
 * Set DID_SOFT_ERROR to retry the request, if possible.
 */
void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
{
	scsi_build_sense_buffer(1, scmd->sense_buffer,
				ILLEGAL_REQUEST, 0x10, ascq);
	set_driver_byte(scmd, DRIVER_SENSE);
	scmd->result |= SAM_STAT_CHECK_CONDITION;
	set_host_byte(scmd, DID_SOFT_ERROR);
}

struct fc_function_template zfcp_transport_functions = {
	.show_starget_port_id = 1,
	.show_starget_port_name = 1,
	.show_starget_node_name = 1,
	.show_rport_supported_classes = 1,
	.show_rport_maxframe_size = 1,
	.show_rport_dev_loss_tmo = 1,
	.show_host_node_name = 1,
	.show_host_port_name = 1,
	.show_host_permanent_port_name = 1,
	.show_host_supported_classes = 1,
	.show_host_supported_fc4s = 1,
	.show_host_supported_speeds = 1,
	.show_host_maxframe_size = 1,
	.show_host_serial_number = 1,
	.get_fc_host_stats = zfcp_get_fc_host_stats,
	.reset_fc_host_stats = zfcp_reset_fc_host_stats,
	.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
	.get_host_port_state = zfcp_get_host_port_state,
	.terminate_rport_io = zfcp_scsi_terminate_rport_io,
	.show_host_port_state = 1,
	.show_host_active_fc4s = 1,
	.bsg_request = zfcp_fc_exec_bsg_job,
	.bsg_timeout = zfcp_fc_timeout_bsg_job,
	/* no functions registered for following dynamic attributes but
	   directly set by LLDD */
	.show_host_port_type = 1,
	.show_host_speed = 1,
	.show_host_port_id = 1,
	.dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
};

struct zfcp_data zfcp_data = {
	.scsi_host_template = {
		.name			 = "zfcp",
		.module			 = THIS_MODULE,
		.proc_name		 = "zfcp",
		.change_queue_depth	 = zfcp_scsi_change_queue_depth,
		.slave_alloc		 = zfcp_scsi_slave_alloc,
		.slave_configure	 = zfcp_scsi_slave_configure,
		.slave_destroy		 = zfcp_scsi_slave_destroy,
		.queuecommand		 = zfcp_scsi_queuecommand,
		.eh_abort_handler	 = zfcp_scsi_eh_abort_handler,
		.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
		.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
		.eh_host_reset_handler	 = zfcp_scsi_eh_host_reset_handler,
		.can_queue		 = 4096,
		.this_id		 = -1,
		.sg_tablesize		 = ZFCP_QDIO_MAX_SBALES_PER_REQ,
		.cmd_per_lun		 = 1,
		.use_clustering		 = 1,
		.sdev_attrs		 = zfcp_sysfs_sdev_attrs,
		.max_sectors		 = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
		.dma_boundary		 = ZFCP_QDIO_SBALE_LEN - 1,
		.shost_attrs		 = zfcp_sysfs_shost_attrs,
	},
};