libfc.h 25.6 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/*
 * 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>
25
#include <linux/percpu.h>
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

#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>

#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_gs.h>

#include <scsi/fc_frame.h>

#define LIBFC_DEBUG

#ifdef LIBFC_DEBUG
/* Log messages */
#define FC_DBG(fmt, args...)						\
	do {								\
		printk(KERN_INFO "%s " fmt, __func__, ##args);		\
	} while (0)
#else
#define FC_DBG(fmt, args...)
#endif

/*
 * libfc error codes
 */
#define	FC_NO_ERR	0	/* no error */
#define	FC_EX_TIMEOUT	1	/* Exchange timeout */
#define	FC_EX_CLOSED	2	/* Exchange closed */

/* some helpful macros */

#define ntohll(x) be64_to_cpu(x)
#define htonll(x) cpu_to_be64(x)

#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))

#define hton24(p, v)	do {			\
		p[0] = (((v) >> 16) & 0xFF);	\
		p[1] = (((v) >> 8) & 0xFF);	\
		p[2] = ((v) & 0xFF);		\
	} while (0)

/*
 * FC HBA status
 */
enum fc_lport_state {
	LPORT_ST_NONE = 0,
	LPORT_ST_FLOGI,
	LPORT_ST_DNS,
	LPORT_ST_RPN_ID,
	LPORT_ST_RFT_ID,
	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 {
	RPORT_ST_NONE = 0,
	RPORT_ST_INIT,		/* initialized */
	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_LOGO,		/* port logout sent */
};

enum fc_rport_trans_state {
	FC_PORTSTATE_ROGUE,
	FC_PORTSTATE_REAL,
};

/**
 * 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
 * @ids: identifiers structure to pass to fc_remote_port_add()
 * @rport_work: work struct for starting the rport state machine
 */
struct fc_disc_port {
	struct fc_lport             *lp;
	struct list_head            peers;
	struct fc_rport_identifiers ids;
	struct work_struct	    rport_work;
};

enum fc_rport_event {
	RPORT_EV_NONE = 0,
	RPORT_EV_CREATED,
	RPORT_EV_FAILED,
	RPORT_EV_STOP,
	RPORT_EV_LOGO
};

struct fc_rport_operations {
	void (*event_callback)(struct fc_lport *, struct fc_rport *,
			       enum fc_rport_event);
};

/**
 * struct fc_rport_libfc_priv - libfc internal information about a remote port
 * @local_port: Fibre Channel host port instance
 * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
 * @flags: REC and RETRY supported flags
 * @max_seq: maximum number of concurrent sequences
 * @retries: retry count in current state
 * @e_d_tov: error detect timeout value (in msec)
 * @r_a_tov: resource allocation timeout value (in msec)
 * @rp_mutex: mutex protects rport
 * @retry_work:
 * @event_callback: Callback for rport READY, FAILED or LOGO
 */
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)
	u16		           max_seq;
	unsigned int	           retries;
	unsigned int	           e_d_tov;
	unsigned int	           r_a_tov;
	enum fc_rport_trans_state  trans_state;
	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;
};

#define PRIV_TO_RPORT(x)						\
	(struct fc_rport *)((void *)x - sizeof(struct fc_rport));
#define RPORT_TO_PRIV(x)						\
	(struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));

struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);

static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
{
	rport->node_name = wwnn;
	rport->port_name = wwpn;
}

/*
 * fcoe stats structure
 */
struct fcoe_dev_stats {
	u64		SecondsSinceLastReset;
	u64		TxFrames;
	u64		TxWords;
	u64		RxFrames;
	u64		RxWords;
	u64		ErrorFrames;
	u64		DumpedFrames;
	u64		LinkFailureCount;
	u64		LossOfSignalCount;
	u64		InvalidTxWordCount;
	u64		InvalidCRCCount;
	u64		InputRequests;
	u64		OutputRequests;
	u64		ControlRequests;
	u64		InputMegabytes;
	u64		OutputMegabytes;
};

/*
 * els data is used for passing ELS respone specific
 * data to send ELS response mainly using infomation
 * in exchange and sequence in EM layer.
 */
struct fc_seq_els_data {
	struct fc_frame *fp;
	enum fc_els_rjt_reason reason;
	enum fc_els_rjt_explan explan;
};

/*
 * FCP request structure, one for each scsi cmd request
 */
struct fc_fcp_pkt {
	/*
	 * housekeeping stuff
	 */
	struct fc_lport *lp;	/* handle to hba struct */
	u16		state;		/* scsi_pkt state state */
	u16		tgt_flags;	/* target flags	 */
	atomic_t	ref_cnt;	/* fcp pkt ref count */
	spinlock_t	scsi_pkt_lock;	/* Must be taken before the host lock
					 * if both are held at the same time */
	/*
	 * SCSI I/O related stuff
	 */
	struct scsi_cmnd *cmd;		/* scsi command pointer. set/clear
					 * under host lock */
	struct list_head list;		/* tracks queued commands. access under
					 * host lock */
	/*
	 * timeout related stuff
	 */
	struct timer_list timer;	/* command timer */
	struct completion tm_done;
	int	wait_for_comp;
	unsigned long	start_time;	/* start jiffie */
	unsigned long	end_time;	/* end jiffie */
	unsigned long	last_pkt_time;	 /* jiffies of last frame received */

	/*
	 * scsi cmd and data transfer information
	 */
	u32		data_len;
	/*
	 * transport related veriables
	 */
	struct fcp_cmnd cdb_cmd;
	size_t		xfer_len;
249
	u16		xfer_ddp;	/* this xfer is ddped */
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
	u32		xfer_contig_end; /* offset of end of contiguous xfer */
	u16		max_payload;	/* max payload size in bytes */

	/*
	 * scsi/fcp return status
	 */
	u32		io_status;	/* SCSI result upper 24 bits */
	u8		cdb_status;
	u8		status_code;	/* FCP I/O status */
	/* bit 3 Underrun bit 2: overrun */
	u8		scsi_comp_flags;
	u32		req_flags;	/* bit 0: read bit:1 write */
	u32		scsi_resid;	/* residule length */

	struct fc_rport	*rport;		/* remote port pointer */
	struct fc_seq	*seq_ptr;	/* current sequence pointer */
	/*
	 * Error Processing
	 */
	u8		recov_retry;	/* count of recovery retries */
	struct fc_seq	*recov_seq;	/* sequence for REC or SRR */
};
272
273
274
275
276
277
278
279
280
/*
 * 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;
}
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

/*
 * 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;

/*
 * Sequence.
 */
struct fc_seq {
	u8	id;		/* seq ID */
	u16	ssb_stat;	/* status flags for sequence status block */
	u16	cnt;		/* frames sent so far on sequence */
	u32	rec_data;	/* FC-4 value for REC */
};

#define FC_EX_DONE		(1 << 0) /* ep is completed */
#define FC_EX_RST_CLEANUP	(1 << 1) /* reset is forcing completion */

/*
 * Exchange.
 *
 * Locking notes: The ex_lock protects following items:
 *	state, esb_stat, f_ctl, seq.ssb_stat
 *	seq_id
 *	sequence allocation
 */
struct fc_exch {
	struct fc_exch_mgr *em;		/* exchange manager */
	u32		state;		/* internal driver state */
	u16		xid;		/* our exchange ID */
	struct list_head	ex_list;	/* free or busy list linkage */
	spinlock_t	ex_lock;	/* lock covering exchange state */
	atomic_t	ex_refcnt;	/* reference counter */
	struct delayed_work timeout_work; /* timer for upper level protocols */
	struct fc_lport	*lp;		/* fc device instance */
	u16		oxid;		/* originator's exchange ID */
	u16		rxid;		/* responder's exchange ID */
	u32		oid;		/* originator's FCID */
	u32		sid;		/* source FCID */
	u32		did;		/* destination FCID */
	u32		esb_stat;	/* exchange status for ESB */
	u32		r_a_tov;	/* r_a_tov from rport (msec) */
	u8		seq_id;		/* next sequence ID to use */
	u32		f_ctl;		/* F_CTL flags for sequences */
	u8		fh_type;	/* frame type */
	enum fc_class	class;		/* class of service */
	struct fc_seq	seq;		/* single sequence */
	/*
	 * Handler for responses to this current exchange.
	 */
	void		(*resp)(struct fc_seq *, struct fc_frame *, void *);
	void		(*destructor)(struct fc_seq *, void *);
	/*
	 * arg is passed as void pointer to exchange
	 * resp and destructor handlers
	 */
	void		*arg;
};
#define	fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)

struct libfc_function_template {

	/*
	 * Interface to send a FC frame
	 *
353
	 * STATUS: REQUIRED
354
	 */
355
	int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
356
357

	/*
358
359
360
	 * Interface to send ELS/CT frames
	 *
	 * STATUS: OPTIONAL
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
	 */
	struct fc_seq *(*elsct_send)(struct fc_lport *lport,
				     struct fc_rport *rport,
				     struct fc_frame *fp,
				     unsigned int op,
				     void (*resp)(struct fc_seq *,
					     struct fc_frame *fp,
					     void *arg),
				     void *arg, u32 timer_msec);

	/*
	 * Send the FC frame payload using a new exchange and sequence.
	 *
	 * The frame pointer with some of the header's fields must be
	 * filled before calling exch_seq_send(), those fields are,
	 *
	 * - routing control
	 * - FC port did
	 * - FC port sid
	 * - FC header type
	 * - frame control
	 * - parameter or relative offset
	 *
	 * The exchange response handler is set in this routine to resp()
	 * function pointer. It can be called in two scenarios: if a timeout
	 * occurs or if a response frame is received for the exchange. The
	 * fc_frame pointer in response handler will also indicate timeout
	 * as error using IS_ERR related macros.
	 *
	 * The exchange destructor handler is also set in this routine.
	 * The destructor handler is invoked by EM layer when exchange
	 * is about to free, this can be used by caller to free its
	 * resources along with exchange free.
	 *
	 * The arg is passed back to resp and destructor handler.
	 *
	 * The timeout value (in msec) for an exchange is set if non zero
	 * timer_msec argument is specified. The timer is canceled when
	 * it fires or when the exchange is done. The exchange timeout handler
	 * is registered by EM layer.
401
402
	 *
	 * STATUS: OPTIONAL
403
404
405
406
407
408
409
410
411
412
	 */
	struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
					struct fc_frame *fp,
					void (*resp)(struct fc_seq *sp,
						     struct fc_frame *fp,
						     void *arg),
					void (*destructor)(struct fc_seq *sp,
							   void *arg),
					void *arg, unsigned int timer_msec);

413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
	/*
	 * 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 *lp, u16 xid,
			 struct scatterlist *sgl, unsigned int sgc);
	/*
	 * Completes the DDP transfer and returns the length of data DDPed
	 * for the given exchange id.
	 *
	 * STATUS: OPTIONAL
	 */
	int (*ddp_done)(struct fc_lport *lp, u16 xid);
428
	/*
429
430
431
	 * Send a frame using an existing sequence and exchange.
	 *
	 * STATUS: OPTIONAL
432
433
434
435
436
	 */
	int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
			struct fc_frame *fp);

	/*
437
438
439
440
	 * Send an ELS response using infomation from a previous
	 * exchange and sequence.
	 *
	 * STATUS: OPTIONAL
441
442
443
444
445
446
447
448
449
450
451
	 */
	void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
				 struct fc_seq_els_data *els_data);

	/*
	 * Abort an exchange and sequence. Generally called because of a
	 * exchange timeout or an abort from the upper layer.
	 *
	 * A timer_msec can be specified for abort timeout, if non-zero
	 * timer_msec value is specified then exchange resp handler
	 * will be called with timeout error if no response to abort.
452
453
	 *
	 * STATUS: OPTIONAL
454
455
456
457
458
459
460
	 */
	int (*seq_exch_abort)(const struct fc_seq *req_sp,
			      unsigned int timer_msec);

	/*
	 * Indicate that an exchange/sequence tuple is complete and the memory
	 * allocated for the related objects may be freed.
461
462
	 *
	 * STATUS: OPTIONAL
463
464
465
466
467
468
469
	 */
	void (*exch_done)(struct fc_seq *sp);

	/*
	 * Assigns a EM and a free XID for an new exchange and then
	 * allocates a new exchange and sequence pair.
	 * The fp can be used to determine free XID.
470
471
	 *
	 * STATUS: OPTIONAL
472
473
474
475
476
477
478
	 */
	struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);

	/*
	 * Release previously assigned XID by exch_get API.
	 * The LLD may implement this if XID is assigned by LLD
	 * in exch_get().
479
480
	 *
	 * STATUS: OPTIONAL
481
482
483
484
485
486
	 */
	void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
			 u16 ex_id);

	/*
	 * Start a new sequence on the same exchange/sequence tuple.
487
488
	 *
	 * STATUS: OPTIONAL
489
490
491
492
493
494
495
	 */
	struct fc_seq *(*seq_start_next)(struct fc_seq *sp);

	/*
	 * 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.
496
497
	 *
	 * STATUS: OPTIONAL
498
	 */
499
	void (*exch_mgr_reset)(struct fc_lport *,
500
501
			       u32 s_id, u32 d_id);

502
503
504
505
	/*
	 * Flush the rport work queue. Generally used before shutdown.
	 *
	 * STATUS: OPTIONAL
506
	 */
507
	void (*rport_flush_queue)(void);
508
509

	/*
510
511
512
	 * Receive a frame for a local port.
	 *
	 * STATUS: OPTIONAL
513
514
515
516
	 */
	void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
			   struct fc_frame *fp);

517
518
519
520
	/*
	 * Reset the local port.
	 *
	 * STATUS: OPTIONAL
521
	 */
522
	int (*lport_reset)(struct fc_lport *);
523

524
525
526
527
528
	/*
	 * Create a remote port
	 */
	struct fc_rport *(*rport_create)(struct fc_disc_port *);

529
530
531
532
533
534
535
536
	/*
	 * Initiates the RP state machine. It is called from the LP module.
	 * This function will issue the following commands to the N_Port
	 * identified by the FC ID provided.
	 *
	 * - PLOGI
	 * - PRLI
	 * - RTV
537
538
	 *
	 * STATUS: OPTIONAL
539
540
541
542
543
544
	 */
	int (*rport_login)(struct fc_rport *rport);

	/*
	 * Logoff, and remove the rport from the transport if
	 * it had been added. This will send a LOGO to the target.
545
546
	 *
	 * STATUS: OPTIONAL
547
548
549
550
551
	 */
	int (*rport_logoff)(struct fc_rport *rport);

	/*
	 * Recieve a request from a remote port.
552
553
	 *
	 * STATUS: OPTIONAL
554
555
556
557
	 */
	void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
			       struct fc_rport *);

558
559
560
561
	/*
	 * lookup an rport by it's port ID.
	 *
	 * STATUS: OPTIONAL
562
	 */
563
	struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
564
565
566
567
568
569
570

	/*
	 * 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.
	 *
571
	 * STATUS: OPTIONAL
572
573
574
575
576
577
	 */
	int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
			    void (*resp)(struct fc_seq *, struct fc_frame *fp,
					 void *arg));

	/*
578
579
580
	 * Cleanup the FCP layer, used durring link down and reset
	 *
	 * STATUS: OPTIONAL
581
582
583
584
585
	 */
	void (*fcp_cleanup)(struct fc_lport *lp);

	/*
	 * Abort all I/O on a local port
586
587
	 *
	 * STATUS: OPTIONAL
588
589
590
	 */
	void (*fcp_abort_io)(struct fc_lport *lp);

591
592
593
594
	/*
	 * Receive a request for the discovery layer.
	 *
	 * STATUS: OPTIONAL
595
596
597
598
599
600
	 */
	void (*disc_recv_req)(struct fc_seq *,
			      struct fc_frame *, struct fc_lport *);

	/*
	 * Start discovery for a local port.
601
602
	 *
	 * STATUS: OPTIONAL
603
604
605
606
607
608
609
610
	 */
	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
611
612
	 *
	 * STATUS: OPTIONAL
613
614
615
616
617
618
619
	 */
	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
620
621
	 *
	 * STATUS: OPTIONAL
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
	 */
	void (*disc_stop_final) (struct fc_lport *);
};

/* information used by the discovery layer */
struct fc_disc {
	unsigned char		retry_count;
	unsigned char		delay;
	unsigned char		pending;
	unsigned char		requested;
	unsigned short		seq_count;
	unsigned char		buf_len;
	enum fc_disc_event	event;

	void (*disc_callback)(struct fc_lport *,
			      enum fc_disc_event);

	struct list_head	 rports;
	struct fc_lport		*lport;
	struct mutex		disc_mutex;
	struct fc_gpn_ft_resp	partial_buf;	/* partial name buffer */
	struct delayed_work	disc_work;
};

struct fc_lport {
	struct list_head list;

	/* Associations */
	struct Scsi_Host	*host;
	struct fc_exch_mgr	*emp;
	struct fc_rport		*dns_rp;
	struct fc_rport		*ptp_rp;
	void			*scsi_priv;
	struct fc_disc          disc;

	/* Operational Information */
	struct libfc_function_template tt;
659
660
	u8			link_up;
	u8			qfull;
661
662
663
664
	enum fc_lport_state	state;
	unsigned long		boot_time;

	struct fc_host_statistics host_stats;
665
666
	struct fcoe_dev_stats	*dev_stats;

667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
	u64			wwpn;
	u64			wwnn;
	u8			retry_count;

	/* Capabilities */
	u32			sg_supp:1;	/* scatter gather supported */
	u32			seq_offload:1;	/* seq offload supported */
	u32			crc_offload:1;	/* crc offload supported */
	u32			lro_enabled:1;	/* large receive offload */
	u32			mfs;	        /* max FC payload size */
	unsigned int		service_params;
	unsigned int		e_d_tov;
	unsigned int		r_a_tov;
	u8			max_retry_count;
	u16			link_speed;
	u16			link_supported_speeds;
	u16			lro_xid;	/* max xid for fcoe lro */
684
	unsigned int		lso_max;	/* max large send size */
685
686
687
688
689
690
691
692
693
694
695
	struct fc_ns_fts	fcts;	        /* FC-4 type masks */
	struct fc_els_rnid_gen	rnid_gen;	/* RNID information */

	/* Semaphores */
	struct mutex lp_mutex;

	/* Miscellaneous */
	struct delayed_work	retry_work;
	struct delayed_work	disc_work;
};

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
 * FC_LPORT HELPER FUNCTIONS
 *****************************/
static inline int fc_lport_test_ready(struct fc_lport *lp)
{
	return lp->state == LPORT_ST_READY;
}

static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
{
	lp->wwnn = wwnn;
}

static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
{
	lp->wwpn = wwnn;
}

static inline void fc_lport_state_enter(struct fc_lport *lp,
					enum fc_lport_state state)
{
	if (state != lp->state)
		lp->retry_count = 0;
	lp->state = state;
}

722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
static inline int fc_lport_init_stats(struct fc_lport *lp)
{
	/* allocate per cpu stats block */
	lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
	if (!lp->dev_stats)
		return -ENOMEM;
	return 0;
}

static inline void fc_lport_free_stats(struct fc_lport *lp)
{
	free_percpu(lp->dev_stats);
}

static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
{
	return per_cpu_ptr(lp->dev_stats, smp_processor_id());
}

741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
static inline void *lport_priv(const struct fc_lport *lp)
{
	return (void *)(lp + 1);
}

/**
 * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
 * @sht: ptr to the scsi host templ
 * @priv_size: size of private data after fc_lport
 *
 * Returns: ptr to Scsi_Host
 */
static inline struct Scsi_Host *
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
{
	return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
}
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
 * LOCAL PORT LAYER
 *****************************/
int fc_lport_init(struct fc_lport *lp);

/*
 * Destroy the specified local port by finding and freeing all
 * fc_rports associated with it and then by freeing the fc_lport
 * itself.
 */
int fc_lport_destroy(struct fc_lport *lp);

/*
 * Logout the specified local port from the fabric
 */
int fc_fabric_logoff(struct fc_lport *lp);

/*
 * Initiate the LP state machine. This handler will use fc_host_attr
 * to store the FLOGI service parameters, so fc_host_attr must be
 * initialized before calling this handler.
 */
int fc_fabric_login(struct fc_lport *lp);

/*
 * The link is up for the given local port.
 */
void fc_linkup(struct fc_lport *);

/*
 * Link is down for the given local port.
 */
void fc_linkdown(struct fc_lport *);

/*
 * Configure the local port.
 */
int fc_lport_config(struct fc_lport *);

/*
 * Reset the local port.
 */
int fc_lport_reset(struct fc_lport *);

/*
 * Set the mfs or reset
 */
int fc_set_mfs(struct fc_lport *lp, u32 mfs);


809
/*
810
811
812
813
814
 * REMOTE PORT LAYER
 *****************************/
int fc_rport_init(struct fc_lport *lp);
void fc_rport_terminate_io(struct fc_rport *rp);

815
/*
816
817
818
819
820
 * DISCOVERY LAYER
 *****************************/
int fc_disc_init(struct fc_lport *lp);


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
 * SCSI LAYER
 *****************************/
/*
 * Initialize the SCSI block of libfc
 */
int fc_fcp_init(struct fc_lport *);

/*
 * This section provides an API which allows direct interaction
 * with the SCSI-ml. Each of these functions satisfies a function
 * pointer defined in Scsi_Host and therefore is always called
 * directly from the SCSI-ml.
 */
int fc_queuecommand(struct scsi_cmnd *sc_cmd,
		    void (*done)(struct scsi_cmnd *));

/*
 * complete processing of a fcp packet
 *
 * This function may sleep if a fsp timer is pending.
 * The host lock must not be held by caller.
 */
void fc_fcp_complete(struct fc_fcp_pkt *fsp);

/*
 * Send an ABTS frame to the target device. The sc_cmd argument
 * is a pointer to the SCSI command to be aborted.
 */
int fc_eh_abort(struct scsi_cmnd *sc_cmd);

/*
 * Reset a LUN by sending send the tm cmd to the target.
 */
int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);

/*
 * Reset the host adapter.
 */
int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);

/*
 * Check rport status.
 */
int fc_slave_alloc(struct scsi_device *sdev);

/*
 * Adjust the queue depth.
 */
int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);

/*
 * Change the tag type.
 */
int fc_change_queue_type(struct scsi_device *sdev, int tag_type);

/*
 * Free memory pools used by the FCP layer.
 */
void fc_fcp_destroy(struct fc_lport *);

882
883
884
885
886
/*
 * Set up direct-data placement for this I/O request
 */
void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid);

887
/*
888
889
890
891
892
893
894
895
 * ELS/CT interface
 *****************************/
/*
 * Initializes ELS/CT interface
 */
int fc_elsct_init(struct fc_lport *lp);


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
 * EXCHANGE MANAGER LAYER
 *****************************/
/*
 * Initializes Exchange Manager related
 * function pointers in struct libfc_function_template.
 */
int fc_exch_init(struct fc_lport *lp);

/*
 * Allocates an Exchange Manager (EM).
 *
 * The EM manages exchanges for their allocation and
 * free, also allows exchange lookup for received
 * frame.
 *
 * The class is used for initializing FC class of
 * allocated exchange from EM.
 *
 * The min_xid and max_xid will limit new
 * exchange ID (XID) within this range for
 * a new exchange.
 * The LLD may choose to have multiple EMs,
 * e.g. one EM instance per CPU receive thread in LLD.
 * The LLD can use exch_get() of struct libfc_function_template
 * to specify XID for a new exchange within
 * a specified EM instance.
 *
 * The em_idx to uniquely identify an EM instance.
 */
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
				      enum fc_class class,
				      u16 min_xid,
				      u16 max_xid);

/*
 * Free an exchange manager.
 */
void fc_exch_mgr_free(struct fc_exch_mgr *mp);

/*
 * Receive a frame on specified local port and exchange manager.
 */
void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
		  struct fc_frame *fp);

/*
 * This function is for exch_seq_send function pointer in
 * struct libfc_function_template, see comment block on
 * exch_seq_send for description of this function.
 */
struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
				struct fc_frame *fp,
				void (*resp)(struct fc_seq *sp,
					     struct fc_frame *fp,
					     void *arg),
				void (*destructor)(struct fc_seq *sp,
						   void *arg),
				void *arg, u32 timer_msec);

/*
 * send a frame using existing sequence and exchange.
 */
int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp);

/*
 * Send ELS response using mainly infomation
 * in exchange and sequence in EM layer.
 */
void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
			 struct fc_seq_els_data *els_data);

/*
 * This function is for seq_exch_abort function pointer in
 * struct libfc_function_template, see comment block on
 * seq_exch_abort for description of this function.
 */
int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec);

/*
 * Indicate that an exchange/sequence tuple is complete and the memory
 * allocated for the related objects may be freed.
 */
void fc_exch_done(struct fc_seq *sp);

/*
 * Assigns a EM and XID for a frame and then allocates
 * a new exchange and sequence pair.
 * The fp can be used to determine free XID.
 */
struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);

/*
 * Allocate a new exchange and sequence pair.
 * if ex_id is zero then next free exchange id
 * from specified exchange manger mp will be assigned.
 */
struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
			      struct fc_frame *fp, u16 ex_id);
/*
 * Start a new sequence on the same exchange as the supplied sequence.
 */
struct fc_seq *fc_seq_start_next(struct fc_seq *sp);

/*
 * 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.
 */
1005
void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024

/*
 * Functions for fc_functions_template
 */
void fc_get_host_speed(struct Scsi_Host *shost);
void fc_get_host_port_type(struct Scsi_Host *shost);
void fc_get_host_port_state(struct Scsi_Host *shost);
void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);

/*
 * module setup functions.
 */
int fc_setup_exch_mgr(void);
void fc_destroy_exch_mgr(void);
int fc_setup_rport(void);
void fc_destroy_rport(void);

#endif /* _LIBFC_H_ */