forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
libfc.h
1021 lines (942 loc) · 31.7 KB
/
libfc.h
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
/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
#ifndef _LIBFC_H_
#define _LIBFC_H_
#include <linux/timer.h>
#include <linux/if.h>
#include <linux/percpu.h>
#include <linux/refcount.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_ms.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc_frame.h>
#define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
/*
* libfc error codes
*/
#define FC_NO_ERR 0 /* no error */
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
#define FC_EX_ALLOC_ERR 3 /* Exchange allocation failed */
#define FC_EX_XMIT_ERR 4 /* Exchange transmit failed */
#define FC_EX_ELS_RJT 5 /* ELS rejected */
#define FC_EX_INV_LOGIN 6 /* Login not completed */
#define FC_EX_SEQ_ERR 6 /* Exchange sequence error */
/**
* enum fc_lport_state - Local port states
* @LPORT_ST_DISABLED: Disabled
* @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
* @LPORT_ST_DNS: Waiting for name server remote port to become ready
* @LPORT_ST_RPN_ID: Register port name by ID (RPN_ID) sent
* @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
* @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
* @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready
* @LPORT_ST_RHBA:
* @LPORT_ST_SCR: State Change Register (SCR) sent
* @LPORT_ST_READY: Ready for use
* @LPORT_ST_LOGO: Local port logout (LOGO) sent
* @LPORT_ST_RESET: Local port reset
*/
enum fc_lport_state {
LPORT_ST_DISABLED = 0,
LPORT_ST_FLOGI,
LPORT_ST_DNS,
LPORT_ST_RNN_ID,
LPORT_ST_RSNN_NN,
LPORT_ST_RSPN_ID,
LPORT_ST_RFT_ID,
LPORT_ST_RFF_ID,
LPORT_ST_FDMI,
LPORT_ST_RHBA,
LPORT_ST_RPA,
LPORT_ST_DHBA,
LPORT_ST_DPRT,
LPORT_ST_SCR,
LPORT_ST_READY,
LPORT_ST_LOGO,
LPORT_ST_RESET
};
enum fc_disc_event {
DISC_EV_NONE = 0,
DISC_EV_SUCCESS,
DISC_EV_FAILED
};
/**
* enum fc_rport_state - Remote port states
* @RPORT_ST_INIT: Initialized
* @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
* @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
* @RPORT_ST_PLOGI: Waiting for PLOGI completion
* @RPORT_ST_PRLI: Waiting for PRLI completion
* @RPORT_ST_RTV: Waiting for RTV completion
* @RPORT_ST_READY: Ready for use
* @RPORT_ST_ADISC: Discover Address sent
* @RPORT_ST_DELETE: Remote port being deleted
*/
enum fc_rport_state {
RPORT_ST_INIT,
RPORT_ST_FLOGI,
RPORT_ST_PLOGI_WAIT,
RPORT_ST_PLOGI,
RPORT_ST_PRLI,
RPORT_ST_RTV,
RPORT_ST_READY,
RPORT_ST_ADISC,
RPORT_ST_DELETE,
};
/**
* struct fc_disc_port - temporary discovery port to hold rport identifiers
* @lp: Fibre Channel host port instance
* @peers: Node for list management during discovery and RSCN processing
* @rport_work: Work struct for starting the rport state machine
* @port_id: Port ID of the discovered port
*/
struct fc_disc_port {
struct fc_lport *lp;
struct list_head peers;
struct work_struct rport_work;
u32 port_id;
};
/**
* enum fc_rport_event - Remote port events
* @RPORT_EV_NONE: No event
* @RPORT_EV_READY: Remote port is ready for use
* @RPORT_EV_FAILED: State machine failed, remote port is not ready
* @RPORT_EV_STOP: Remote port has been stopped
* @RPORT_EV_LOGO: Remote port logout (LOGO) sent
*/
enum fc_rport_event {
RPORT_EV_NONE = 0,
RPORT_EV_READY,
RPORT_EV_FAILED,
RPORT_EV_STOP,
RPORT_EV_LOGO
};
struct fc_rport_priv;
/**
* struct fc_rport_operations - Operations for a remote port
* @event_callback: Function to be called for remote port events
*/
struct fc_rport_operations {
void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* struct fc_rport_libfc_priv - libfc internal information about a remote port
* @local_port: The associated local port
* @rp_state: Indicates READY for I/O or DELETE when blocked
* @flags: REC and RETRY supported flags
* @e_d_tov: Error detect timeout value (in msec)
* @r_a_tov: Resource allocation timeout value (in msec)
*/
struct fc_rport_libfc_priv {
struct fc_lport *local_port;
enum fc_rport_state rp_state;
u16 flags;
#define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
#define FC_RP_FLAGS_RETRY (1 << 1)
#define FC_RP_STARTED (1 << 2)
#define FC_RP_FLAGS_CONF_REQ (1 << 3)
unsigned int e_d_tov;
unsigned int r_a_tov;
};
/**
* struct fc_rport_priv - libfc remote port and discovery info
* @local_port: The associated local port
* @rport: The FC transport remote port
* @kref: Reference counter
* @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
* and RTV exchanges
* @ids: The remote port identifiers and roles
* @flags: STARTED, REC and RETRY_SUPPORTED flags
* @max_seq: Maximum number of concurrent sequences
* @disc_id: The discovery identifier
* @maxframe_size: The maximum frame size
* @retries: The retry count for the current state
* @major_retries: The retry count for the entire PLOGI/PRLI state machine
* @e_d_tov: Error detect timeout value (in msec)
* @r_a_tov: Resource allocation timeout value (in msec)
* @rp_mutex: The mutex that protects the remote port
* @retry_work: Handle for retries
* @event_callback: Callback when READY, FAILED or LOGO states complete
* @prli_count: Count of open PRLI sessions in providers
* @rcu: Structure used for freeing in an RCU-safe manner
*/
struct fc_rport_priv {
struct fc_lport *local_port;
struct fc_rport *rport;
struct kref kref;
enum fc_rport_state rp_state;
struct fc_rport_identifiers ids;
u16 flags;
u16 max_seq;
u16 disc_id;
u16 maxframe_size;
unsigned int retries;
unsigned int major_retries;
unsigned int e_d_tov;
unsigned int r_a_tov;
struct mutex rp_mutex;
struct delayed_work retry_work;
enum fc_rport_event event;
struct fc_rport_operations *ops;
struct list_head peers;
struct work_struct event_work;
u32 supported_classes;
u16 prli_count;
struct rcu_head rcu;
u16 sp_features;
u8 spp_type;
void (*lld_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* struct fc_stats - fc stats structure
* @SecondsSinceLastReset: Seconds since the last reset
* @TxFrames: Number of transmitted frames
* @TxWords: Number of transmitted words
* @RxFrames: Number of received frames
* @RxWords: Number of received words
* @ErrorFrames: Number of received error frames
* @DumpedFrames: Number of dumped frames
* @FcpPktAllocFails: Number of fcp packet allocation failures
* @FcpPktAborts: Number of fcp packet aborts
* @FcpFrameAllocFails: Number of fcp frame allocation failures
* @LinkFailureCount: Number of link failures
* @LossOfSignalCount: Number for signal losses
* @InvalidTxWordCount: Number of invalid transmitted words
* @InvalidCRCCount: Number of invalid CRCs
* @InputRequests: Number of input requests
* @OutputRequests: Number of output requests
* @ControlRequests: Number of control requests
* @InputBytes: Number of received bytes
* @OutputBytes: Number of transmitted bytes
* @VLinkFailureCount: Number of virtual link failures
* @MissDiscAdvCount: Number of missing FIP discovery advertisement
*/
struct fc_stats {
u64 SecondsSinceLastReset;
u64 TxFrames;
u64 TxWords;
u64 RxFrames;
u64 RxWords;
u64 ErrorFrames;
u64 DumpedFrames;
u64 FcpPktAllocFails;
u64 FcpPktAborts;
u64 FcpFrameAllocFails;
u64 LinkFailureCount;
u64 LossOfSignalCount;
u64 InvalidTxWordCount;
u64 InvalidCRCCount;
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputBytes;
u64 OutputBytes;
u64 VLinkFailureCount;
u64 MissDiscAdvCount;
};
/**
* struct fc_seq_els_data - ELS data used for passing ELS specific responses
* @reason: The reason for rejection
* @explan: The explanation of the rejection
*
* Mainly used by the exchange manager layer.
*/
struct fc_seq_els_data {
enum fc_els_rjt_reason reason;
enum fc_els_rjt_explan explan;
};
/**
* struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
* @lp: The associated local port
* @state: The state of the I/O
* @ref_cnt: Reference count
* @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
* host_lock if both are to be held at the same time)
* @cmd: The SCSI command (set and clear with the host_lock held)
* @list: Tracks queued commands (accessed with the host_lock held)
* @timer: The command timer
* @tm_done: Completion indicator
* @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
* @data_len: The length of the data
* @cdb_cmd: The CDB command
* @xfer_len: The transfer length
* @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange
* will be set here if DDP was setup)
* @xfer_contig_end: The offset into the buffer if the buffer is contiguous
* (Tx and Rx)
* @max_payload: The maximum payload size (in bytes)
* @io_status: SCSI result (upper 24 bits)
* @cdb_status: CDB status
* @status_code: FCP I/O status
* @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
* @req_flags: Request flags (bit 0: read bit:1 write)
* @scsi_resid: SCSI residule length
* @rport: The remote port that the SCSI command is targeted at
* @seq_ptr: The sequence that will carry the SCSI command
* @recov_retry: Number of recovery retries
* @recov_seq: The sequence for REC or SRR
*/
struct fc_fcp_pkt {
spinlock_t scsi_pkt_lock;
refcount_t ref_cnt;
/* SCSI command and data transfer information */
u32 data_len;
/* SCSI I/O related information */
struct scsi_cmnd *cmd;
struct list_head list;
/* Housekeeping information */
struct fc_lport *lp;
u8 state;
/* SCSI/FCP return status */
u8 cdb_status;
u8 status_code;
u8 scsi_comp_flags;
u32 io_status;
u32 req_flags;
u32 scsi_resid;
/* Transport related veriables */
size_t xfer_len;
struct fcp_cmnd cdb_cmd;
u32 xfer_contig_end;
u16 max_payload;
u16 xfer_ddp;
/* Associated structures */
struct fc_rport *rport;
struct fc_seq *seq_ptr;
/* Timeout/error related information */
struct timer_list timer;
int wait_for_comp;
int timer_delay;
u32 recov_retry;
struct fc_seq *recov_seq;
struct completion tm_done;
} ____cacheline_aligned_in_smp;
/*
* Structure and function definitions for managing Fibre Channel Exchanges
* and Sequences
*
* fc_exch holds state for one exchange and links to its active sequence.
*
* fc_seq holds the state for an individual sequence.
*/
struct fc_exch_mgr;
struct fc_exch_mgr_anchor;
extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
/**
* struct fc_seq - FC sequence
* @id: The sequence ID
* @ssb_stat: Status flags for the sequence status block (SSB)
* @cnt: Number of frames sent so far
* @rec_data: FC-4 value for REC
*/
struct fc_seq {
u8 id;
u16 ssb_stat;
u16 cnt;
u32 rec_data;
};
#define FC_EX_DONE (1 << 0) /* ep is completed */
#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
#define FC_EX_QUARANTINE (1 << 2) /* exch is quarantined */
/**
* struct fc_exch - Fibre Channel Exchange
* @em: Exchange manager
* @pool: Exchange pool
* @state: The exchange's state
* @xid: The exchange ID
* @ex_list: Handle used by the EM to track free exchanges
* @ex_lock: Lock that protects the exchange
* @ex_refcnt: Reference count
* @timeout_work: Handle for timeout handler
* @lp: The local port that this exchange is on
* @oxid: Originator's exchange ID
* @rxid: Responder's exchange ID
* @oid: Originator's FCID
* @sid: Source FCID
* @did: Destination FCID
* @esb_stat: ESB exchange status
* @r_a_tov: Resouce allocation time out value (in msecs)
* @seq_id: The next sequence ID to use
* @encaps: encapsulation information for lower-level driver
* @f_ctl: F_CTL flags for the sequence
* @fh_type: The frame type
* @class: The class of service
* @seq: The sequence in use on this exchange
* @resp_active: Number of tasks that are concurrently executing @resp().
* @resp_task: If @resp_active > 0, either the task executing @resp(), the
* task that has been interrupted to execute the soft-IRQ
* executing @resp() or NULL if more than one task is executing
* @resp concurrently.
* @resp_wq: Waitqueue for the tasks waiting on @resp_active.
* @resp: Callback for responses on this exchange
* @destructor: Called when destroying the exchange
* @arg: Passed as a void pointer to the resp() callback
*
* Locking notes: The ex_lock protects following items:
* state, esb_stat, f_ctl, seq.ssb_stat
* seq_id
* sequence allocation
*/
struct fc_exch {
spinlock_t ex_lock;
atomic_t ex_refcnt;
enum fc_class class;
struct fc_exch_mgr *em;
struct fc_exch_pool *pool;
struct list_head ex_list;
struct fc_lport *lp;
u32 esb_stat;
u8 state;
u8 fh_type;
u8 seq_id;
u8 encaps;
u16 xid;
u16 oxid;
u16 rxid;
u32 oid;
u32 sid;
u32 did;
u32 r_a_tov;
u32 f_ctl;
struct fc_seq seq;
int resp_active;
struct task_struct *resp_task;
wait_queue_head_t resp_wq;
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void *arg;
void (*destructor)(struct fc_seq *, void *);
struct delayed_work timeout_work;
} ____cacheline_aligned_in_smp;
#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
struct libfc_function_template {
/*
* Interface to send a FC frame
*
* STATUS: REQUIRED
*/
int (*frame_send)(struct fc_lport *, struct fc_frame *);
/*
* Interface to send ELS/CT frames
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
struct fc_frame *, unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *, void *arg),
void *arg, u32 timer_msec);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for large receive.
*
* STATUS: OPTIONAL
*/
int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
unsigned int);
/*
* Completes the DDP transfer and returns the length of data DDPed
* for the given exchange id.
*
* STATUS: OPTIONAL
*/
int (*ddp_done)(struct fc_lport *, u16);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for target.
*
* STATUS: OPTIONAL
*/
int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
unsigned int);
/*
* Allow LLD to fill its own Link Error Status Block
*
* STATUS: OPTIONAL
*/
void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
/*
* Reset an exchange manager, completing all sequences and exchanges.
* If s_id is non-zero, reset only exchanges originating from that FID.
* If d_id is non-zero, reset only exchanges sending to that FID.
*
* STATUS: OPTIONAL
*/
void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
/*
* Set the local port FC_ID.
*
* This may be provided by the LLD to allow it to be
* notified when the local port is assigned a FC-ID.
*
* The frame, if non-NULL, is the incoming frame with the
* FLOGI LS_ACC or FLOGI, and may contain the granted MAC
* address for the LLD. The frame pointer may be NULL if
* no MAC is associated with this assignment (LOGO or PLOGI).
*
* If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
*
* Note: this is called with the local port mutex held.
*
* STATUS: OPTIONAL
*/
void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
struct fc_frame *);
/*
* Callback routine after the remote port is logged in
*
* STATUS: OPTIONAL
*/
void (*rport_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
/*
* Send a fcp cmd from fsp pkt.
* Called with the SCSI host lock unlocked and irqs disabled.
*
* The resp handler is called when FCP_RSP received.
*
* STATUS: OPTIONAL
*/
int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
void (*resp)(struct fc_seq *, struct fc_frame *,
void *));
/*
* Cleanup the FCP layer, used during link down and reset
*
* STATUS: OPTIONAL
*/
void (*fcp_cleanup)(struct fc_lport *);
/*
* Abort all I/O on a local port
*
* STATUS: OPTIONAL
*/
void (*fcp_abort_io)(struct fc_lport *);
/*
* Receive a request for the discovery layer.
*
* STATUS: OPTIONAL
*/
void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
/*
* Start discovery for a local port.
*
* STATUS: OPTIONAL
*/
void (*disc_start)(void (*disc_callback)(struct fc_lport *,
enum fc_disc_event),
struct fc_lport *);
/*
* Stop discovery for a given lport. This will remove
* all discovered rports
*
* STATUS: OPTIONAL
*/
void (*disc_stop) (struct fc_lport *);
/*
* Stop discovery for a given lport. This will block
* until all discovered rports are deleted from the
* FC transport class
*
* STATUS: OPTIONAL
*/
void (*disc_stop_final) (struct fc_lport *);
};
/**
* struct fc_disc - Discovery context
* @retry_count: Number of retries
* @pending: 1 if discovery is pending, 0 if not
* @requested: 1 if discovery has been requested, 0 if not
* @seq_count: Number of sequences used for discovery
* @buf_len: Length of the discovery buffer
* @disc_id: Discovery ID
* @rports: List of discovered remote ports
* @priv: Private pointer for use by discovery code
* @disc_mutex: Mutex that protects the discovery context
* @partial_buf: Partial name buffer (if names are returned
* in multiple frames)
* @disc_work: handle for delayed work context
* @disc_callback: Callback routine called when discovery completes
*/
struct fc_disc {
unsigned char retry_count;
unsigned char pending;
unsigned char requested;
unsigned short seq_count;
unsigned char buf_len;
u16 disc_id;
struct list_head rports;
void *priv;
struct mutex disc_mutex;
struct fc_gpn_ft_resp partial_buf;
struct delayed_work disc_work;
void (*disc_callback)(struct fc_lport *,
enum fc_disc_event);
};
/*
* Local port notifier and events.
*/
extern struct blocking_notifier_head fc_lport_notifier_head;
enum fc_lport_event {
FC_LPORT_EV_ADD,
FC_LPORT_EV_DEL,
};
/**
* struct fc_lport - Local port
* @host: The SCSI host associated with a local port
* @ema_list: Exchange manager anchor list
* @dns_rdata: The directory server remote port
* @ms_rdata: The management server remote port
* @ptp_rdata: Point to point remote port
* @scsi_priv: FCP layer internal data
* @disc: Discovery context
* @vports: Child vports if N_Port
* @vport: Parent vport if VN_Port
* @tt: Libfc function template
* @link_up: Link state (1 = link up, 0 = link down)
* @qfull: Queue state (1 queue is full, 0 queue is not full)
* @state: Identifies the state
* @boot_time: Timestamp indicating when the local port came online
* @host_stats: SCSI host statistics
* @stats: FC local port stats (TODO separate libfc LLD stats)
* @retry_count: Number of retries in the current state
* @port_id: FC Port ID
* @wwpn: World Wide Port Name
* @wwnn: World Wide Node Name
* @service_params: Common service parameters
* @e_d_tov: Error detection timeout value
* @r_a_tov: Resouce allocation timeout value
* @rnid_gen: RNID information
* @sg_supp: Indicates if scatter gather is supported
* @seq_offload: Indicates if sequence offload is supported
* @crc_offload: Indicates if CRC offload is supported
* @lro_enabled: Indicates if large receive offload is supported
* @does_npiv: Supports multiple vports
* @npiv_enabled: Switch/fabric allows NPIV
* @mfs: The maximum Fibre Channel payload size
* @max_retry_count: The maximum retry attempts
* @max_rport_retry_count: The maximum remote port retry attempts
* @rport_priv_size: Size needed by driver after struct fc_rport_priv
* @lro_xid: The maximum XID for LRO
* @lso_max: The maximum large offload send size
* @fcts: FC-4 type mask
* @lp_mutex: Mutex to protect the local port
* @list: Linkage on list of vport peers
* @retry_work: Handle to local port for delayed retry context
* @prov: Pointers available for use by passive FC-4 providers
* @lport_list: Linkage on module-wide list of local ports
*/
struct fc_lport {
/* Associations */
struct Scsi_Host *host;
struct list_head ema_list;
struct fc_rport_priv *dns_rdata;
struct fc_rport_priv *ms_rdata;
struct fc_rport_priv *ptp_rdata;
void *scsi_priv;
struct fc_disc disc;
/* Virtual port information */
struct list_head vports;
struct fc_vport *vport;
/* Operational Information */
struct libfc_function_template tt;
u8 link_up;
u8 qfull;
u16 vlan;
enum fc_lport_state state;
unsigned long boot_time;
struct fc_host_statistics host_stats;
struct fc_stats __percpu *stats;
u8 retry_count;
/* Fabric information */
u32 port_id;
u64 wwpn;
u64 wwnn;
unsigned int service_params;
unsigned int e_d_tov;
unsigned int r_a_tov;
struct fc_els_rnid_gen rnid_gen;
/* Capabilities */
u32 sg_supp:1;
u32 seq_offload:1;
u32 crc_offload:1;
u32 lro_enabled:1;
u32 does_npiv:1;
u32 npiv_enabled:1;
u32 point_to_multipoint:1;
u32 fdmi_enabled:1;
u32 mfs;
u8 max_retry_count;
u8 max_rport_retry_count;
u16 rport_priv_size;
u16 link_speed;
u16 link_supported_speeds;
u16 lro_xid;
unsigned int lso_max;
struct fc_ns_fts fcts;
/* Miscellaneous */
struct mutex lp_mutex;
struct list_head list;
struct delayed_work retry_work;
void *prov[FC_FC4_PROV_SIZE];
struct list_head lport_list;
};
/**
* struct fc4_prov - FC-4 provider registration
* @prli: Handler for incoming PRLI
* @prlo: Handler for session reset
* @recv: Handler for incoming request
* @module: Pointer to module. May be NULL.
*/
struct fc4_prov {
int (*prli)(struct fc_rport_priv *, u32 spp_len,
const struct fc_els_spp *spp_in,
struct fc_els_spp *spp_out);
void (*prlo)(struct fc_rport_priv *);
void (*recv)(struct fc_lport *, struct fc_frame *);
struct module *module;
};
/*
* Register FC-4 provider with libfc.
*/
int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
/*
* FC_LPORT HELPER FUNCTIONS
*****************************/
/**
* fc_lport_test_ready() - Determine if a local port is in the READY state
* @lport: The local port to test
*/
static inline int fc_lport_test_ready(struct fc_lport *lport)
{
return lport->state == LPORT_ST_READY;
}
/**
* fc_set_wwnn() - Set the World Wide Node Name of a local port
* @lport: The local port whose WWNN is to be set
* @wwnn: The new WWNN
*/
static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
{
lport->wwnn = wwnn;
}
/**
* fc_set_wwpn() - Set the World Wide Port Name of a local port
* @lport: The local port whose WWPN is to be set
* @wwpn: The new WWPN
*/
static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwpn)
{
lport->wwpn = wwpn;
}
/**
* fc_lport_state_enter() - Change a local port's state
* @lport: The local port whose state is to change
* @state: The new state
*/
static inline void fc_lport_state_enter(struct fc_lport *lport,
enum fc_lport_state state)
{
if (state != lport->state)
lport->retry_count = 0;
lport->state = state;
}
/**
* fc_lport_init_stats() - Allocate per-CPU statistics for a local port
* @lport: The local port whose statistics are to be initialized
*/
static inline int fc_lport_init_stats(struct fc_lport *lport)
{
lport->stats = alloc_percpu(struct fc_stats);
if (!lport->stats)
return -ENOMEM;
return 0;
}
/**
* fc_lport_free_stats() - Free memory for a local port's statistics
* @lport: The local port whose statistics are to be freed
*/
static inline void fc_lport_free_stats(struct fc_lport *lport)
{
free_percpu(lport->stats);
}
/**
* lport_priv() - Return the private data from a local port
* @lport: The local port whose private data is to be retreived
*/
static inline void *lport_priv(const struct fc_lport *lport)
{
return (void *)(lport + 1);
}
/**
* libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
* LLD private data
* @sht: The SCSI host template
* @priv_size: Size of private data
*
* Returns: libfc lport
*/
static inline struct fc_lport *
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
{
struct fc_lport *lport;
struct Scsi_Host *shost;
shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
if (!shost)
return NULL;
lport = shost_priv(shost);
lport->host = shost;
INIT_LIST_HEAD(&lport->ema_list);
INIT_LIST_HEAD(&lport->vports);
return lport;
}
/*
* FC_FCP HELPER FUNCTIONS
*****************************/
static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
{
if (fsp && fsp->cmd)
return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
return false;
}
/*
* LOCAL PORT LAYER
*****************************/
int fc_lport_init(struct fc_lport *);
int fc_lport_destroy(struct fc_lport *);
int fc_fabric_logoff(struct fc_lport *);
int fc_fabric_login(struct fc_lport *);
void __fc_linkup(struct fc_lport *);
void fc_linkup(struct fc_lport *);
void __fc_linkdown(struct fc_lport *);
void fc_linkdown(struct fc_lport *);
void fc_vport_setlink(struct fc_lport *);
void fc_vports_linkchange(struct fc_lport *);
int fc_lport_config(struct fc_lport *);
int fc_lport_reset(struct fc_lport *);
void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp);
int fc_set_mfs(struct fc_lport *, u32 mfs);
struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
int fc_lport_bsg_request(struct bsg_job *);
void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
/*
* REMOTE PORT LAYER
*****************************/
void fc_rport_terminate_io(struct fc_rport *);
struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
u32 port_id);
struct fc_rport_priv *fc_rport_create(struct fc_lport *, u32);
void fc_rport_destroy(struct kref *kref);
int fc_rport_login(struct fc_rport_priv *rdata);
int fc_rport_logoff(struct fc_rport_priv *rdata);
void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp);
void fc_rport_flush_queue(void);
/*
* DISCOVERY LAYER
*****************************/
void fc_disc_init(struct fc_lport *);
void fc_disc_config(struct fc_lport *, void *);
static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
{
return container_of(disc, struct fc_lport, disc);
}
/*
* FCP LAYER
*****************************/
int fc_fcp_init(struct fc_lport *);
void fc_fcp_destroy(struct fc_lport *);
/*
* SCSI INTERACTION LAYER
*****************************/
int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
int fc_eh_abort(struct scsi_cmnd *);
int fc_eh_device_reset(struct scsi_cmnd *);
int fc_eh_host_reset(struct scsi_cmnd *);
int fc_slave_alloc(struct scsi_device *);
/*
* ELS/CT interface
*****************************/
int fc_elsct_init(struct fc_lport *);
struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
struct fc_frame *,
unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *,
void *arg),
void *arg, u32 timer_msec);
void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 parm_offset);
void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
/*
* EXCHANGE MANAGER LAYER
*****************************/
int fc_exch_init(struct fc_lport *);
void fc_exch_update_stats(struct fc_lport *lport);
struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
struct fc_frame *fp,
void (*resp)(struct fc_seq *,
struct fc_frame *fp,
void *arg),
void (*destructor)(struct fc_seq *, void *),
void *arg, u32 timer_msec);
void fc_seq_els_rsp_send(struct fc_frame *, enum fc_els_cmd,
struct fc_seq_els_data *);
struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
void fc_seq_set_resp(struct fc_seq *sp,
void (*resp)(struct fc_seq *, struct fc_frame *, void *),
void *arg);
struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp);
void fc_seq_release(struct fc_seq *sp);
struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
struct fc_exch_mgr *,
bool (*match)(struct fc_frame *));