summaryrefslogtreecommitdiffstats
path: root/drivers/s390/scsi/zfcp_def.h
blob: 2df512a18e2c5ca18ca908e01e3b2f9e253022f3 (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
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
/* 
 * This file is part of the zfcp device driver for
 * FCP adapters for IBM System z9 and zSeries.
 *
 * (C) Copyright IBM Corp. 2002, 2006
 * 
 * This program is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 2, or (at your option) 
 * any later version. 
 * 
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * GNU General Public License for more details. 
 * 
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 */ 


#ifndef ZFCP_DEF_H
#define ZFCP_DEF_H

/*************************** INCLUDES *****************************************/

#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include "zfcp_fsf.h"
#include <asm/ccwdev.h>
#include <asm/qdio.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <linux/mempool.h>
#include <linux/syscalls.h>
#include <linux/ioctl.h>


/********************* GENERAL DEFINES *********************************/

/* zfcp version number, it consists of major, minor, and patch-level number */
#define ZFCP_VERSION		"4.7.0"

/**
 * zfcp_sg_to_address - determine kernel address from struct scatterlist
 * @list: struct scatterlist
 * Return: kernel address
 */
static inline void *
zfcp_sg_to_address(struct scatterlist *list)
{
	return (void *) (page_address(list->page) + list->offset);
}

/**
 * zfcp_address_to_sg - set up struct scatterlist from kernel address
 * @address: kernel address
 * @list: struct scatterlist
 */
static inline void
zfcp_address_to_sg(void *address, struct scatterlist *list)
{
	list->page = virt_to_page(address);
	list->offset = ((unsigned long) address) & (PAGE_SIZE - 1);
}

#define REQUEST_LIST_SIZE 128

/********************* SCSI SPECIFIC DEFINES *********************************/
#define ZFCP_SCSI_ER_TIMEOUT                    (100*HZ)

/********************* CIO/QDIO SPECIFIC DEFINES *****************************/

/* Adapter Identification Parameters */
#define ZFCP_CONTROL_UNIT_TYPE  0x1731
#define ZFCP_CONTROL_UNIT_MODEL 0x03
#define ZFCP_DEVICE_TYPE        0x1732
#define ZFCP_DEVICE_MODEL       0x03
#define ZFCP_DEVICE_MODEL_PRIV	0x04
 
/* allow as many chained SBALs as are supported by hardware */
#define ZFCP_MAX_SBALS_PER_REQ		FSF_MAX_SBALS_PER_REQ
#define ZFCP_MAX_SBALS_PER_CT_REQ	FSF_MAX_SBALS_PER_REQ
#define ZFCP_MAX_SBALS_PER_ELS_REQ	FSF_MAX_SBALS_PER_ELS_REQ

/* DMQ bug workaround: don't use last SBALE */
#define ZFCP_MAX_SBALES_PER_SBAL	(QDIO_MAX_ELEMENTS_PER_BUFFER - 1)

/* index of last SBALE (with respect to DMQ bug workaround) */
#define ZFCP_LAST_SBALE_PER_SBAL	(ZFCP_MAX_SBALES_PER_SBAL - 1)

/* max. number of (data buffer) SBALEs in largest SBAL chain */
#define ZFCP_MAX_SBALES_PER_REQ		\
	(ZFCP_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
        /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */

/* FIXME(tune): free space should be one max. SBAL chain plus what? */
#define ZFCP_QDIO_PCI_INTERVAL		(QDIO_MAX_BUFFERS_PER_Q \
                                         - (ZFCP_MAX_SBALS_PER_REQ + 4))

#define ZFCP_SBAL_TIMEOUT               (5*HZ)

#define ZFCP_TYPE2_RECOVERY_TIME        (8*HZ)

/* queue polling (values in microseconds) */
#define ZFCP_MAX_INPUT_THRESHOLD 	5000	/* FIXME: tune */
#define ZFCP_MAX_OUTPUT_THRESHOLD 	1000	/* FIXME: tune */
#define ZFCP_MIN_INPUT_THRESHOLD 	1	/* ignored by QDIO layer */
#define ZFCP_MIN_OUTPUT_THRESHOLD 	1	/* ignored by QDIO layer */

#define QDIO_SCSI_QFMT			1	/* 1 for FSF */

/********************* FSF SPECIFIC DEFINES *********************************/

#define ZFCP_ULP_INFO_VERSION                   26
#define ZFCP_QTCB_VERSION	FSF_QTCB_CURRENT_VERSION
/* ATTENTION: value must not be used by hardware */
#define FSF_QTCB_UNSOLICITED_STATUS		0x6305
#define ZFCP_STATUS_READ_FAILED_THRESHOLD	3
#define ZFCP_STATUS_READS_RECOM		        FSF_STATUS_READS_RECOM

/* Do 1st retry in 1 second, then double the timeout for each following retry */
#define ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP	100
#define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES	7

/* timeout value for "default timer" for fsf requests */
#define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ);

/*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/

typedef unsigned long long wwn_t;
typedef unsigned long long fcp_lun_t;
/* data length field may be at variable position in FCP-2 FCP_CMND IU */
typedef unsigned int       fcp_dl_t;

#define ZFCP_FC_SERVICE_CLASS_DEFAULT	FSF_CLASS_3

/* timeout for name-server lookup (in seconds) */
#define ZFCP_NS_GID_PN_TIMEOUT		10

/* largest SCSI command we can process */
/* FCP-2 (FCP_CMND IU) allows up to (255-3+16) */
#define ZFCP_MAX_SCSI_CMND_LENGTH	255
/* maximum number of commands in LUN queue (tagged queueing) */
#define ZFCP_CMND_PER_LUN               32

/* task attribute values in FCP-2 FCP_CMND IU */
#define SIMPLE_Q	0
#define HEAD_OF_Q	1
#define ORDERED_Q	2
#define ACA_Q		4
#define UNTAGGED	5

/* task management flags in FCP-2 FCP_CMND IU */
#define FCP_CLEAR_ACA		0x40
#define FCP_TARGET_RESET	0x20
#define FCP_LOGICAL_UNIT_RESET	0x10
#define FCP_CLEAR_TASK_SET	0x04
#define FCP_ABORT_TASK_SET	0x02

#define FCP_CDB_LENGTH		16

#define ZFCP_DID_MASK           0x00FFFFFF

/* FCP(-2) FCP_CMND IU */
struct fcp_cmnd_iu {
	fcp_lun_t fcp_lun;	   /* FCP logical unit number */
	u8  crn;	           /* command reference number */
	u8  reserved0:5;	   /* reserved */
	u8  task_attribute:3;	   /* task attribute */
	u8  task_management_flags; /* task management flags */
	u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
	u8  rddata:1;              /* read data */
	u8  wddata:1;              /* write data */
	u8  fcp_cdb[FCP_CDB_LENGTH];
} __attribute__((packed));

/* FCP(-2) FCP_RSP IU */
struct fcp_rsp_iu {
	u8  reserved0[10];
	union {
		struct {
			u8 reserved1:3;
			u8 fcp_conf_req:1;
			u8 fcp_resid_under:1;
			u8 fcp_resid_over:1;
			u8 fcp_sns_len_valid:1;
			u8 fcp_rsp_len_valid:1;
		} bits;
		u8 value;
	} validity;
	u8  scsi_status;
	u32 fcp_resid;
	u32 fcp_sns_len;
	u32 fcp_rsp_len;
} __attribute__((packed));


#define RSP_CODE_GOOD		 0
#define RSP_CODE_LENGTH_MISMATCH 1
#define RSP_CODE_FIELD_INVALID	 2
#define RSP_CODE_RO_MISMATCH	 3
#define RSP_CODE_TASKMAN_UNSUPP	 4
#define RSP_CODE_TASKMAN_FAILED	 5

/* see fc-fs */
#define LS_RSCN  0x61040000
#define LS_LOGO  0x05000000
#define LS_PLOGI 0x03000000

struct fcp_rscn_head {
        u8  command;
        u8  page_length; /* always 0x04 */
        u16 payload_len;
} __attribute__((packed));

struct fcp_rscn_element {
        u8  reserved:2;
        u8  event_qual:4;
        u8  addr_format:2;
        u32 nport_did:24;
} __attribute__((packed));

#define ZFCP_PORT_ADDRESS   0x0
#define ZFCP_AREA_ADDRESS   0x1
#define ZFCP_DOMAIN_ADDRESS 0x2
#define ZFCP_FABRIC_ADDRESS 0x3

#define ZFCP_PORTS_RANGE_PORT   0xFFFFFF
#define ZFCP_PORTS_RANGE_AREA   0xFFFF00
#define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
#define ZFCP_PORTS_RANGE_FABRIC 0x000000

#define ZFCP_NO_PORTS_PER_AREA    0x100
#define ZFCP_NO_PORTS_PER_DOMAIN  0x10000
#define ZFCP_NO_PORTS_PER_FABRIC  0x1000000

/* see fc-ph */
struct fcp_logo {
        u32 command;
        u32 nport_did;
        wwn_t nport_wwpn;
} __attribute__((packed));

/*
 * DBF stuff
 */
#define ZFCP_DBF_TAG_SIZE      4

struct zfcp_dbf_dump {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u32 total_size;		/* size of total dump data */
	u32 offset;		/* how much data has being already dumped */
	u32 size;		/* how much data comes with this record */
	u8 data[];		/* dump data */
} __attribute__ ((packed));

/* FIXME: to be inflated when reworking the erp dbf */
struct zfcp_erp_dbf_record {
	u8 dummy[16];
} __attribute__ ((packed));

struct zfcp_hba_dbf_record_response {
	u32 fsf_command;
	u64 fsf_reqid;
	u32 fsf_seqno;
	u64 fsf_issued;
	u32 fsf_prot_status;
	u32 fsf_status;
	u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
	u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	u32 fsf_req_status;
	u8 sbal_first;
	u8 sbal_curr;
	u8 sbal_last;
	u8 pool;
	u64 erp_action;
	union {
		struct {
			u64 scsi_cmnd;
			u64 scsi_serial;
		} send_fcp;
		struct {
			u64 wwpn;
			u32 d_id;
			u32 port_handle;
		} port;
		struct {
			u64 wwpn;
			u64 fcp_lun;
			u32 port_handle;
			u32 lun_handle;
		} unit;
		struct {
			u32 d_id;
			u8 ls_code;
		} send_els;
	} data;
} __attribute__ ((packed));

struct zfcp_hba_dbf_record_status {
	u8 failed;
	u32 status_type;
	u32 status_subtype;
	struct fsf_queue_designator
	 queue_designator;
	u32 payload_size;
#define ZFCP_DBF_UNSOL_PAYLOAD				80
#define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL		32
#define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD	56
#define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT	2 * sizeof(u32)
	u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
} __attribute__ ((packed));

struct zfcp_hba_dbf_record_qdio {
	u32 status;
	u32 qdio_error;
	u32 siga_error;
	u8 sbal_index;
	u8 sbal_count;
} __attribute__ ((packed));

struct zfcp_hba_dbf_record {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u8 tag2[ZFCP_DBF_TAG_SIZE];
	union {
		struct zfcp_hba_dbf_record_response response;
		struct zfcp_hba_dbf_record_status status;
		struct zfcp_hba_dbf_record_qdio qdio;
	} type;
} __attribute__ ((packed));

struct zfcp_san_dbf_record_ct {
	union {
		struct {
			u16 cmd_req_code;
			u8 revision;
			u8 gs_type;
			u8 gs_subtype;
			u8 options;
			u16 max_res_size;
		} request;
		struct {
			u16 cmd_rsp_code;
			u8 revision;
			u8 reason_code;
			u8 reason_code_expl;
			u8 vendor_unique;
		} response;
	} type;
	u32 payload_size;
#define ZFCP_DBF_CT_PAYLOAD	24
	u8 payload[ZFCP_DBF_CT_PAYLOAD];
} __attribute__ ((packed));

struct zfcp_san_dbf_record_els {
	u8 ls_code;
	u32 payload_size;
#define ZFCP_DBF_ELS_PAYLOAD	32
#define ZFCP_DBF_ELS_MAX_PAYLOAD 1024
	u8 payload[ZFCP_DBF_ELS_PAYLOAD];
} __attribute__ ((packed));

struct zfcp_san_dbf_record {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u64 fsf_reqid;
	u32 fsf_seqno;
	u32 s_id;
	u32 d_id;
	union {
		struct zfcp_san_dbf_record_ct ct;
		struct zfcp_san_dbf_record_els els;
	} type;
} __attribute__ ((packed));

struct zfcp_scsi_dbf_record {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u8 tag2[ZFCP_DBF_TAG_SIZE];
	u32 scsi_id;
	u32 scsi_lun;
	u32 scsi_result;
	u64 scsi_cmnd;
	u64 scsi_serial;
#define ZFCP_DBF_SCSI_OPCODE	16
	u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
	u8 scsi_retries;
	u8 scsi_allowed;
	u64 fsf_reqid;
	u32 fsf_seqno;
	u64 fsf_issued;
	union {
		u64 old_fsf_reqid;
		struct {
			u8 rsp_validity;
			u8 rsp_scsi_status;
			u32 rsp_resid;
			u8 rsp_code;
#define ZFCP_DBF_SCSI_FCP_SNS_INFO	16
#define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO	256
			u32 sns_info_len;
			u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
		} fcp;
	} type;
} __attribute__ ((packed));

/*
 * FC-FS stuff
 */
#define R_A_TOV				10 /* seconds */
#define ZFCP_ELS_TIMEOUT		(2 * R_A_TOV)

#define ZFCP_LS_RLS			0x0f
#define ZFCP_LS_ADISC			0x52
#define ZFCP_LS_RPS			0x56
#define ZFCP_LS_RSCN			0x61
#define ZFCP_LS_RNID			0x78

struct zfcp_ls_rjt_par {
	u8 action;
 	u8 reason_code;
 	u8 reason_expl;
 	u8 vendor_unique;
} __attribute__ ((packed));

struct zfcp_ls_adisc {
	u8		code;
	u8		field[3];
	u32		hard_nport_id;
	u64		wwpn;
	u64		wwnn;
	u32		nport_id;
} __attribute__ ((packed));

struct zfcp_ls_adisc_acc {
	u8		code;
	u8		field[3];
	u32		hard_nport_id;
	u64		wwpn;
	u64		wwnn;
	u32		nport_id;
} __attribute__ ((packed));

struct zfcp_rc_entry {
	u8 code;
	const char *description;
};

/*
 * FC-GS-2 stuff
 */
#define ZFCP_CT_REVISION		0x01
#define ZFCP_CT_DIRECTORY_SERVICE	0xFC
#define ZFCP_CT_NAME_SERVER		0x02
#define ZFCP_CT_SYNCHRONOUS		0x00
#define ZFCP_CT_GID_PN			0x0121
#define ZFCP_CT_MAX_SIZE		0x1020
#define ZFCP_CT_ACCEPT			0x8002
#define ZFCP_CT_REJECT			0x8001

/*
 * FC-GS-4 stuff
 */
#define ZFCP_CT_TIMEOUT			(3 * R_A_TOV)

/******************** LOGGING MACROS AND DEFINES *****************************/

/*
 * Logging may be applied on certain kinds of driver operations
 * independently. Additionally, different log-levels are supported for
 * each of these areas.
 */

#define ZFCP_NAME               "zfcp"

/* independent log areas */
#define ZFCP_LOG_AREA_OTHER	0
#define ZFCP_LOG_AREA_SCSI	1
#define ZFCP_LOG_AREA_FSF	2
#define ZFCP_LOG_AREA_CONFIG	3
#define ZFCP_LOG_AREA_CIO	4
#define ZFCP_LOG_AREA_QDIO	5
#define ZFCP_LOG_AREA_ERP	6
#define ZFCP_LOG_AREA_FC	7

/* log level values*/
#define ZFCP_LOG_LEVEL_NORMAL	0
#define ZFCP_LOG_LEVEL_INFO	1
#define ZFCP_LOG_LEVEL_DEBUG	2
#define ZFCP_LOG_LEVEL_TRACE	3

/*
 * this allows removal of logging code by the preprocessor
 * (the most detailed log level still to be compiled in is specified, 
 * higher log levels are removed)
 */
#define ZFCP_LOG_LEVEL_LIMIT	ZFCP_LOG_LEVEL_TRACE

/* get "loglevel" nibble assignment */
#define ZFCP_GET_LOG_VALUE(zfcp_lognibble) \
	       ((atomic_read(&zfcp_data.loglevel) >> (zfcp_lognibble<<2)) & 0xF)

/* set "loglevel" nibble */
#define ZFCP_SET_LOG_NIBBLE(value, zfcp_lognibble) \
	       (value << (zfcp_lognibble << 2))

/* all log-level defaults are combined to generate initial log-level */
#define ZFCP_LOG_LEVEL_DEFAULTS \
	(ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_OTHER) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_SCSI) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FSF) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CONFIG) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CIO) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_QDIO) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_ERP) | \
	 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FC))

/* check whether we have the right level for logging */
#define ZFCP_LOG_CHECK(level) \
	((ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA)) >= level)

/* logging routine for zfcp */
#define _ZFCP_LOG(fmt, args...) \
	printk(KERN_ERR ZFCP_NAME": %s(%d): " fmt, __FUNCTION__, \
	       __LINE__ , ##args)

#define ZFCP_LOG(level, fmt, args...) \
do { \
	if (ZFCP_LOG_CHECK(level)) \
		_ZFCP_LOG(fmt, ##args); \
} while (0)
	
#if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_NORMAL
# define ZFCP_LOG_NORMAL(fmt, args...)
#else
# define ZFCP_LOG_NORMAL(fmt, args...) \
do { \
	if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_NORMAL)) \
		printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
} while (0)
#endif

#if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_INFO
# define ZFCP_LOG_INFO(fmt, args...)
#else
# define ZFCP_LOG_INFO(fmt, args...) \
do { \
	if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_INFO)) \
		printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
} while (0)
#endif

#if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_DEBUG
# define ZFCP_LOG_DEBUG(fmt, args...)
#else
# define ZFCP_LOG_DEBUG(fmt, args...) \
	ZFCP_LOG(ZFCP_LOG_LEVEL_DEBUG, fmt , ##args)
#endif

#if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_TRACE
# define ZFCP_LOG_TRACE(fmt, args...)
#else
# define ZFCP_LOG_TRACE(fmt, args...) \
	ZFCP_LOG(ZFCP_LOG_LEVEL_TRACE, fmt , ##args)
#endif

/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/

/* 
 * Note, the leftmost status byte is common among adapter, port 
 * and unit
 */
#define ZFCP_COMMON_FLAGS			0xfff00000

/* common status bits */
#define ZFCP_STATUS_COMMON_REMOVE		0x80000000
#define ZFCP_STATUS_COMMON_RUNNING		0x40000000
#define ZFCP_STATUS_COMMON_ERP_FAILED		0x20000000
#define ZFCP_STATUS_COMMON_UNBLOCKED		0x10000000
#define ZFCP_STATUS_COMMON_OPENING              0x08000000
#define ZFCP_STATUS_COMMON_OPEN                 0x04000000
#define ZFCP_STATUS_COMMON_CLOSING              0x02000000
#define ZFCP_STATUS_COMMON_ERP_INUSE		0x01000000
#define ZFCP_STATUS_COMMON_ACCESS_DENIED	0x00800000
#define ZFCP_STATUS_COMMON_ACCESS_BOXED		0x00400000

/* adapter status */
#define ZFCP_STATUS_ADAPTER_QDIOUP		0x00000002
#define ZFCP_STATUS_ADAPTER_REGISTERED		0x00000004
#define ZFCP_STATUS_ADAPTER_XCONFIG_OK		0x00000008
#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT	0x00000010
#define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP	0x00000020
#define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL	0x00000080
#define ZFCP_STATUS_ADAPTER_ERP_PENDING		0x00000100
#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED	0x00000200
#define ZFCP_STATUS_ADAPTER_XPORT_OK		0x00000800

/* FC-PH/FC-GS well-known address identifiers for generic services */
#define ZFCP_DID_MANAGEMENT_SERVICE		0xFFFFFA
#define ZFCP_DID_TIME_SERVICE			0xFFFFFB
#define ZFCP_DID_DIRECTORY_SERVICE		0xFFFFFC
#define ZFCP_DID_ALIAS_SERVICE			0xFFFFF8
#define ZFCP_DID_KEY_DISTRIBUTION_SERVICE	0xFFFFF7

/* remote port status */
#define ZFCP_STATUS_PORT_PHYS_OPEN		0x00000001
#define ZFCP_STATUS_PORT_DID_DID		0x00000002
#define ZFCP_STATUS_PORT_PHYS_CLOSING		0x00000004
#define ZFCP_STATUS_PORT_NO_WWPN		0x00000008
#define ZFCP_STATUS_PORT_NO_SCSI_ID		0x00000010
#define ZFCP_STATUS_PORT_INVALID_WWPN		0x00000020

/* for ports with well known addresses */
#define ZFCP_STATUS_PORT_WKA \
		(ZFCP_STATUS_PORT_NO_WWPN | \
		 ZFCP_STATUS_PORT_NO_SCSI_ID)

/* logical unit status */
#define ZFCP_STATUS_UNIT_NOTSUPPUNITRESET	0x00000001
#define ZFCP_STATUS_UNIT_TEMPORARY		0x00000002
#define ZFCP_STATUS_UNIT_SHARED			0x00000004
#define ZFCP_STATUS_UNIT_READONLY		0x00000008
#define ZFCP_STATUS_UNIT_REGISTERED		0x00000010

/* FSF request status (this does not have a common part) */
#define ZFCP_STATUS_FSFREQ_NOT_INIT		0x00000000
#define ZFCP_STATUS_FSFREQ_POOL  		0x00000001
#define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT	0x00000002
#define ZFCP_STATUS_FSFREQ_COMPLETED		0x00000004
#define ZFCP_STATUS_FSFREQ_ERROR		0x00000008
#define ZFCP_STATUS_FSFREQ_CLEANUP		0x00000010
#define ZFCP_STATUS_FSFREQ_ABORTING		0x00000020
#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED	0x00000040
#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
#define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
#define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
#define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
#define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000

/*********************** ERROR RECOVERY PROCEDURE DEFINES ********************/

#define ZFCP_MAX_ERPS                   3

#define ZFCP_ERP_FSFREQ_TIMEOUT		(30 * HZ)
#define ZFCP_ERP_MEMWAIT_TIMEOUT	HZ

#define ZFCP_STATUS_ERP_TIMEDOUT	0x10000000
#define ZFCP_STATUS_ERP_CLOSE_ONLY	0x01000000
#define ZFCP_STATUS_ERP_DISMISSING	0x00100000
#define ZFCP_STATUS_ERP_DISMISSED	0x00200000
#define ZFCP_STATUS_ERP_LOWMEM		0x00400000

#define ZFCP_ERP_STEP_UNINITIALIZED	0x00000000
#define ZFCP_ERP_STEP_FSF_XCONFIG	0x00000001
#define ZFCP_ERP_STEP_PHYS_PORT_CLOSING	0x00000010
#define ZFCP_ERP_STEP_PORT_CLOSING	0x00000100
#define ZFCP_ERP_STEP_NAMESERVER_OPEN	0x00000200
#define ZFCP_ERP_STEP_NAMESERVER_LOOKUP	0x00000400
#define ZFCP_ERP_STEP_PORT_OPENING	0x00000800
#define ZFCP_ERP_STEP_UNIT_CLOSING	0x00001000
#define ZFCP_ERP_STEP_UNIT_OPENING	0x00002000

/* Ordered by escalation level (necessary for proper erp-code operation) */
#define ZFCP_ERP_ACTION_REOPEN_ADAPTER		0x4
#define ZFCP_ERP_ACTION_REOPEN_PORT_FORCED	0x3
#define ZFCP_ERP_ACTION_REOPEN_PORT		0x2
#define ZFCP_ERP_ACTION_REOPEN_UNIT		0x1

#define ZFCP_ERP_ACTION_RUNNING			0x1
#define ZFCP_ERP_ACTION_READY			0x2

#define ZFCP_ERP_SUCCEEDED	0x0
#define ZFCP_ERP_FAILED		0x1
#define ZFCP_ERP_CONTINUES	0x2
#define ZFCP_ERP_EXIT		0x3
#define ZFCP_ERP_DISMISSED	0x4
#define ZFCP_ERP_NOMEM		0x5


/******************** CFDC SPECIFIC STUFF *****************************/

/* Firewall data channel sense data record */
struct zfcp_cfdc_sense_data {
	u32 signature;           /* Request signature */
	u32 devno;               /* FCP adapter device number */
	u32 command;             /* Command code */
	u32 fsf_status;          /* FSF request status and status qualifier */
	u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	u8  payloads[256];       /* Access conflicts list */
	u8  control_file[0];     /* Access control table */
};

#define ZFCP_CFDC_SIGNATURE			0xCFDCACDF

#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL		0x00010001
#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE		0x00010101
#define ZFCP_CFDC_CMND_FULL_ACCESS		0x00000201
#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS	0x00000401
#define ZFCP_CFDC_CMND_UPLOAD			0x00010002

#define ZFCP_CFDC_DOWNLOAD			0x00000001
#define ZFCP_CFDC_UPLOAD			0x00000002
#define ZFCP_CFDC_WITH_CONTROL_FILE		0x00010000

#define ZFCP_CFDC_DEV_NAME			"zfcp_cfdc"
#define ZFCP_CFDC_DEV_MAJOR			MISC_MAJOR
#define ZFCP_CFDC_DEV_MINOR			MISC_DYNAMIC_MINOR

#define ZFCP_CFDC_MAX_CONTROL_FILE_SIZE		127 * 1024

/************************* STRUCTURE DEFINITIONS *****************************/

struct zfcp_fsf_req;

/* holds various memory pools of an adapter */
struct zfcp_adapter_mempool {
	mempool_t *fsf_req_erp;
	mempool_t *fsf_req_scsi;
	mempool_t *fsf_req_abort;
	mempool_t *fsf_req_status_read;
	mempool_t *data_status_read;
	mempool_t *data_gid_pn;
};

/*
 * header for CT_IU
 */
struct ct_hdr {
	u8 revision;		// 0x01
	u8 in_id[3];		// 0x00
	u8 gs_type;		// 0xFC	Directory Service
	u8 gs_subtype;		// 0x02	Name Server
	u8 options;		// 0x00 single bidirectional exchange
	u8 reserved0;
	u16 cmd_rsp_code;	// 0x0121 GID_PN, or 0x0100 GA_NXT
	u16 max_res_size;	// <= (4096 - 16) / 4
	u8 reserved1;
	u8 reason_code;
	u8 reason_code_expl;
	u8 vendor_unique;
} __attribute__ ((packed));

/* nameserver request CT_IU -- for requests where
 * a port name is required */
struct ct_iu_gid_pn_req {
	struct ct_hdr header;
	wwn_t wwpn;
} __attribute__ ((packed));

/* FS_ACC IU and data unit for GID_PN nameserver request */
struct ct_iu_gid_pn_resp {
	struct ct_hdr header;
	u32 d_id;
} __attribute__ ((packed));

typedef void (*zfcp_send_ct_handler_t)(unsigned long);

/**
 * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 * @port: port where the request is sent to
 * @req: scatter-gather list for request
 * @resp: scatter-gather list for response
 * @req_count: number of elements in request scatter-gather list
 * @resp_count: number of elements in response scatter-gather list
 * @handler: handler function (called for response to the request)
 * @handler_data: data passed to handler function
 * @pool: pointer to memory pool for ct request structure
 * @timeout: FSF timeout for this request
 * @timer: timer (e.g. for request initiated by erp)
 * @completion: completion for synchronization purposes
 * @status: used to pass error status to calling function
 */
struct zfcp_send_ct {
	struct zfcp_port *port;
	struct scatterlist *req;
	struct scatterlist *resp;
	unsigned int req_count;
	unsigned int resp_count;
	zfcp_send_ct_handler_t handler;
	unsigned long handler_data;
	mempool_t *pool;
	int timeout;
	struct timer_list *timer;
	struct completion *completion;
	int status;
};

/* used for name server requests in error recovery */
struct zfcp_gid_pn_data {
	struct zfcp_send_ct ct;
	struct scatterlist req;
	struct scatterlist resp;
	struct ct_iu_gid_pn_req ct_iu_req;
	struct ct_iu_gid_pn_resp ct_iu_resp;
        struct zfcp_port *port;
};

typedef void (*zfcp_send_els_handler_t)(unsigned long);

/**
 * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 * @adapter: adapter where request is sent from
 * @port: port where ELS is destinated (port reference count has to be increased)
 * @d_id: destiniation id of port where request is sent to
 * @req: scatter-gather list for request
 * @resp: scatter-gather list for response
 * @req_count: number of elements in request scatter-gather list
 * @resp_count: number of elements in response scatter-gather list
 * @handler: handler function (called for response to the request)
 * @handler_data: data passed to handler function
 * @timer: timer (e.g. for request initiated by erp)
 * @completion: completion for synchronization purposes
 * @ls_code: hex code of ELS command
 * @status: used to pass error status to calling function
 */
struct zfcp_send_els {
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	u32 d_id;
	struct scatterlist *req;
	struct scatterlist *resp;
	unsigned int req_count;
	unsigned int resp_count;
	zfcp_send_els_handler_t handler;
	unsigned long handler_data;
	struct timer_list *timer;
	struct completion *completion;
	int ls_code;
	int status;
};

struct zfcp_qdio_queue {
	struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
	u8		   free_index;	      /* index of next free bfr
						 in queue (free_count>0) */
	atomic_t           free_count;	      /* number of free buffers
						 in queue */
	rwlock_t	   queue_lock;	      /* lock for operations on queue */
        int                distance_from_int; /* SBALs used since PCI indication
						 was last set */
};

struct zfcp_erp_action {
	struct list_head list;
	int action;	              /* requested action code */
	struct zfcp_adapter *adapter; /* device which should be recovered */
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	volatile u32 status;	      /* recovery status */
	u32 step;	              /* active step of this erp action */
	struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
					 for this action */
	struct timer_list timer;
};


struct zfcp_adapter {
	struct list_head	list;              /* list of adapters */
	atomic_t                refcount;          /* reference count */
	wait_queue_head_t	remove_wq;         /* can be used to wait for
						      refcount drop to zero */
	wwn_t			peer_wwnn;	   /* P2P peer WWNN */
	wwn_t			peer_wwpn;	   /* P2P peer WWPN */
	u32			peer_d_id;	   /* P2P peer D_ID */
	struct ccw_device       *ccw_device;	   /* S/390 ccw device */
	u32			hydra_version;	   /* Hydra version */
	u32			fsf_lic_version;
	u32			adapter_features;  /* FCP channel features */
	u32			connection_features; /* host connection features */
        u32			hardware_version;  /* of FCP channel */
	struct Scsi_Host	*scsi_host;	   /* Pointer to mid-layer */
	struct list_head	port_list_head;	   /* remote port list */
	struct list_head        port_remove_lh;    /* head of ports to be
						      removed */
	u32			ports;	           /* number of remote ports */
        struct timer_list       scsi_er_timer;     /* SCSI err recovery watch */
	struct list_head	fsf_req_list_head; /* head of FSF req list */
	spinlock_t		fsf_req_list_lock; /* lock for ops on list of
						      FSF requests */
        atomic_t       		fsf_reqs_active;   /* # active FSF reqs */
	struct zfcp_qdio_queue	request_queue;	   /* request queue */
	u32			fsf_req_seq_no;	   /* FSF cmnd seq number */
	wait_queue_head_t	request_wq;	   /* can be used to wait for
						      more avaliable SBALs */
	struct zfcp_qdio_queue	response_queue;	   /* response queue */
	rwlock_t		abort_lock;        /* Protects against SCSI
						      stack abort/command
						      completion races */
	u16			status_read_failed; /* # failed status reads */
	atomic_t		status;	           /* status of this adapter */
	struct list_head	erp_ready_head;	   /* error recovery for this
						      adapter/devices */
	struct list_head	erp_running_head;
	rwlock_t		erp_lock;
	struct semaphore	erp_ready_sem;
	wait_queue_head_t	erp_thread_wqh;
	wait_queue_head_t	erp_done_wqh;
	struct zfcp_erp_action	erp_action;	   /* pending error recovery */
        atomic_t                erp_counter;
	u32			erp_total_count;   /* total nr of enqueued erp
						      actions */
	u32			erp_low_mem_count; /* nr of erp actions waiting
						      for memory */
	struct zfcp_port	*nameserver_port;  /* adapter's nameserver */
	debug_info_t		*erp_dbf;
	debug_info_t		*hba_dbf;
	debug_info_t		*san_dbf;          /* debug feature areas */
	debug_info_t		*scsi_dbf;
	spinlock_t		erp_dbf_lock;
	spinlock_t		hba_dbf_lock;
	spinlock_t		san_dbf_lock;
	spinlock_t		scsi_dbf_lock;
	struct zfcp_erp_dbf_record	erp_dbf_buf;
	struct zfcp_hba_dbf_record	hba_dbf_buf;
	struct zfcp_san_dbf_record	san_dbf_buf;
	struct zfcp_scsi_dbf_record	scsi_dbf_buf;
	struct zfcp_adapter_mempool	pool;      /* Adapter memory pools */
	struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
	struct device           generic_services;  /* directory for WKA ports */
	struct fc_host_statistics *fc_stats;
	struct fsf_qtcb_bottom_port *stats_reset_data;
	unsigned long		stats_reset;
};

/*
 * the struct device sysfs_device must be at the beginning of this structure.
 * pointer to struct device is used to free port structure in release function
 * of the device. don't change!
 */
struct zfcp_port {
	struct device          sysfs_device;   /* sysfs device */
	struct fc_rport        *rport;         /* rport of fc transport class */
	struct list_head       list;	       /* list of remote ports */
	atomic_t               refcount;       /* reference count */
	wait_queue_head_t      remove_wq;      /* can be used to wait for
						  refcount drop to zero */
	struct zfcp_adapter    *adapter;       /* adapter used to access port */
	struct list_head       unit_list_head; /* head of logical unit list */
	struct list_head       unit_remove_lh; /* head of luns to be removed
						  list */
	u32		       units;	       /* # of logical units in list */
	atomic_t	       status;	       /* status of this remote port */
	wwn_t		       wwnn;	       /* WWNN if known */
	wwn_t		       wwpn;	       /* WWPN */
	u32		       d_id;	       /* D_ID */
	u32		       handle;	       /* handle assigned by FSF */
	struct zfcp_erp_action erp_action;     /* pending error recovery */
        atomic_t               erp_counter;
	u32                    maxframe_size;
	u32                    supported_classes;
};

/* the struct device sysfs_device must be at the beginning of this structure.
 * pointer to struct device is used to free unit structure in release function
 * of the device. don't change!
 */
struct zfcp_unit {
	struct device          sysfs_device;   /* sysfs device */
	struct list_head       list;	       /* list of logical units */
	atomic_t               refcount;       /* reference count */
	wait_queue_head_t      remove_wq;      /* can be used to wait for
						  refcount drop to zero */
	struct zfcp_port       *port;	       /* remote port of unit */
	atomic_t	       status;	       /* status of this logical unit */
	unsigned int	       scsi_lun;       /* own SCSI LUN */
	fcp_lun_t	       fcp_lun;	       /* own FCP_LUN */
	u32		       handle;	       /* handle assigned by FSF */
        struct scsi_device     *device;        /* scsi device struct pointer */
	struct zfcp_erp_action erp_action;     /* pending error recovery */
        atomic_t               erp_counter;
};

/* FSF request */
struct zfcp_fsf_req {
	struct list_head       list;	       /* list of FSF requests */
	struct zfcp_adapter    *adapter;       /* adapter request belongs to */
	u8		       sbal_number;    /* nr of SBALs free for use */
	u8		       sbal_first;     /* first SBAL for this request */
	u8		       sbal_last;      /* last possible SBAL for
						  this reuest */
	u8		       sbal_curr;      /* current SBAL during creation
						  of request */
	u8		       sbale_curr;     /* current SBALE during creation
						  of request */
	wait_queue_head_t      completion_wq;  /* can be used by a routine
						  to wait for completion */
	volatile u32	       status;	       /* status of this request */
	u32		       fsf_command;    /* FSF Command copy */
	struct fsf_qtcb	       *qtcb;	       /* address of associated QTCB */
	u32		       seq_no;         /* Sequence number of request */
        unsigned long          data;           /* private data of request */ 
	struct zfcp_erp_action *erp_action;    /* used if this request is
						  issued on behalf of erp */
	mempool_t	       *pool;	       /* used if request was alloacted
						  from emergency pool */
	unsigned long long     issued;         /* request sent time (STCK) */
	struct zfcp_unit       *unit;
};

typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);

/* driver data */
struct zfcp_data {
	struct scsi_host_template scsi_host_template;
        atomic_t                status;             /* Module status flags */
	struct list_head	adapter_list_head;  /* head of adapter list */
	struct list_head	adapter_remove_lh;  /* head of adapters to be
						       removed */
	u32			adapters;	    /* # of adapters in list */
	rwlock_t                config_lock;        /* serialises changes
						       to adapter/port/unit
						       lists */
	struct semaphore        config_sema;        /* serialises configuration
						       changes */
	atomic_t		loglevel;            /* current loglevel */
	char                    init_busid[BUS_ID_SIZE];
	wwn_t                   init_wwpn;
	fcp_lun_t               init_fcp_lun;
	char 			*driver_version;
};

/**
 * struct zfcp_sg_list - struct describing a scatter-gather list
 * @sg: pointer to array of (struct scatterlist)
 * @count: number of elements in scatter-gather list
 */
struct zfcp_sg_list {
	struct scatterlist *sg;
	unsigned int count;
};

/* number of elements for various memory pools */
#define ZFCP_POOL_FSF_REQ_ERP_NR	1
#define ZFCP_POOL_FSF_REQ_SCSI_NR	1
#define ZFCP_POOL_FSF_REQ_ABORT_NR	1
#define ZFCP_POOL_STATUS_READ_NR	ZFCP_STATUS_READS_RECOM
#define ZFCP_POOL_DATA_GID_PN_NR	1

/* struct used by memory pools for fsf_requests */
struct zfcp_fsf_req_pool_element {
	struct zfcp_fsf_req fsf_req;
	struct fsf_qtcb qtcb;
};

/********************** ZFCP SPECIFIC DEFINES ********************************/

#define ZFCP_REQ_AUTO_CLEANUP	0x00000002
#define ZFCP_WAIT_FOR_SBAL	0x00000004
#define ZFCP_REQ_NO_QTCB	0x00000008

#define ZFCP_SET                0x00000100
#define ZFCP_CLEAR              0x00000200

#ifndef atomic_test_mask
#define atomic_test_mask(mask, target) \
           ((atomic_read(target) & mask) == mask)
#endif

extern void _zfcp_hex_dump(char *, int);
#define ZFCP_HEX_DUMP(level, addr, count) \
		if (ZFCP_LOG_CHECK(level)) { \
			_zfcp_hex_dump(addr, count); \
		}

#define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
#define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
#define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))

/*
 *  functions needed for reference/usage counting
 */

static inline void
zfcp_unit_get(struct zfcp_unit *unit)
{
	atomic_inc(&unit->refcount);
}

static inline void
zfcp_unit_put(struct zfcp_unit *unit)
{
	if (atomic_dec_return(&unit->refcount) == 0)
		wake_up(&unit->remove_wq);
}

static inline void
zfcp_unit_wait(struct zfcp_unit *unit)
{
	wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
}

static inline void
zfcp_port_get(struct zfcp_port *port)
{
	atomic_inc(&port->refcount);
}

static inline void
zfcp_port_put(struct zfcp_port *port)
{
	if (atomic_dec_return(&port->refcount) == 0)
		wake_up(&port->remove_wq);
}

static inline void
zfcp_port_wait(struct zfcp_port *port)
{
	wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
}

static inline void
zfcp_adapter_get(struct zfcp_adapter *adapter)
{
	atomic_inc(&adapter->refcount);
}

static inline void
zfcp_adapter_put(struct zfcp_adapter *adapter)
{
	if (atomic_dec_return(&adapter->refcount) == 0)
		wake_up(&adapter->remove_wq);
}

static inline void
zfcp_adapter_wait(struct zfcp_adapter *adapter)
{
	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
}

#endif /* ZFCP_DEF_H */