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1/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#ifndef _LIBFC_H_
21#define _LIBFC_H_
22
23#include <linux/timer.h>
24#include <linux/if.h>
25#include <linux/percpu.h>
26
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_fc.h>
29#include <scsi/scsi_bsg_fc.h>
30
31#include <scsi/fc/fc_fcp.h>
32#include <scsi/fc/fc_ns.h>
33#include <scsi/fc/fc_els.h>
34#include <scsi/fc/fc_gs.h>
35
36#include <scsi/fc_frame.h>
37
38#define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
39
40/*
41 * libfc error codes
42 */
43#define FC_NO_ERR 0 /* no error */
44#define FC_EX_TIMEOUT 1 /* Exchange timeout */
45#define FC_EX_CLOSED 2 /* Exchange closed */
46
47/**
48 * enum fc_lport_state - Local port states
49 * @LPORT_ST_DISABLED: Disabled
50 * @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
51 * @LPORT_ST_DNS: Waiting for name server remote port to become ready
52 * @LPORT_ST_RPN_ID: Register port name by ID (RPN_ID) sent
53 * @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
54 * @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
55 * @LPORT_ST_SCR: State Change Register (SCR) sent
56 * @LPORT_ST_READY: Ready for use
57 * @LPORT_ST_LOGO: Local port logout (LOGO) sent
58 * @LPORT_ST_RESET: Local port reset
59 */
60enum fc_lport_state {
61 LPORT_ST_DISABLED = 0,
62 LPORT_ST_FLOGI,
63 LPORT_ST_DNS,
64 LPORT_ST_RNN_ID,
65 LPORT_ST_RSNN_NN,
66 LPORT_ST_RSPN_ID,
67 LPORT_ST_RFT_ID,
68 LPORT_ST_RFF_ID,
69 LPORT_ST_SCR,
70 LPORT_ST_READY,
71 LPORT_ST_LOGO,
72 LPORT_ST_RESET
73};
74
75enum fc_disc_event {
76 DISC_EV_NONE = 0,
77 DISC_EV_SUCCESS,
78 DISC_EV_FAILED
79};
80
81/**
82 * enum fc_rport_state - Remote port states
83 * @RPORT_ST_INIT: Initialized
84 * @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
85 * @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
86 * @RPORT_ST_PLOGI: Waiting for PLOGI completion
87 * @RPORT_ST_PRLI: Waiting for PRLI completion
88 * @RPORT_ST_RTV: Waiting for RTV completion
89 * @RPORT_ST_READY: Ready for use
90 * @RPORT_ST_ADISC: Discover Address sent
91 * @RPORT_ST_DELETE: Remote port being deleted
92*/
93enum fc_rport_state {
94 RPORT_ST_INIT,
95 RPORT_ST_FLOGI,
96 RPORT_ST_PLOGI_WAIT,
97 RPORT_ST_PLOGI,
98 RPORT_ST_PRLI,
99 RPORT_ST_RTV,
100 RPORT_ST_READY,
101 RPORT_ST_ADISC,
102 RPORT_ST_DELETE,
103};
104
105/**
106 * struct fc_disc_port - temporary discovery port to hold rport identifiers
107 * @lp: Fibre Channel host port instance
108 * @peers: Node for list management during discovery and RSCN processing
109 * @rport_work: Work struct for starting the rport state machine
110 * @port_id: Port ID of the discovered port
111 */
112struct fc_disc_port {
113 struct fc_lport *lp;
114 struct list_head peers;
115 struct work_struct rport_work;
116 u32 port_id;
117};
118
119/**
120 * enum fc_rport_event - Remote port events
121 * @RPORT_EV_NONE: No event
122 * @RPORT_EV_READY: Remote port is ready for use
123 * @RPORT_EV_FAILED: State machine failed, remote port is not ready
124 * @RPORT_EV_STOP: Remote port has been stopped
125 * @RPORT_EV_LOGO: Remote port logout (LOGO) sent
126 */
127enum fc_rport_event {
128 RPORT_EV_NONE = 0,
129 RPORT_EV_READY,
130 RPORT_EV_FAILED,
131 RPORT_EV_STOP,
132 RPORT_EV_LOGO
133};
134
135struct fc_rport_priv;
136
137/**
138 * struct fc_rport_operations - Operations for a remote port
139 * @event_callback: Function to be called for remote port events
140 */
141struct fc_rport_operations {
142 void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
143 enum fc_rport_event);
144};
145
146/**
147 * struct fc_rport_libfc_priv - libfc internal information about a remote port
148 * @local_port: The associated local port
149 * @rp_state: Indicates READY for I/O or DELETE when blocked
150 * @flags: REC and RETRY supported flags
151 * @e_d_tov: Error detect timeout value (in msec)
152 * @r_a_tov: Resource allocation timeout value (in msec)
153 */
154struct fc_rport_libfc_priv {
155 struct fc_lport *local_port;
156 enum fc_rport_state rp_state;
157 u16 flags;
158 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
159 #define FC_RP_FLAGS_RETRY (1 << 1)
160 #define FC_RP_STARTED (1 << 2)
161 #define FC_RP_FLAGS_CONF_REQ (1 << 3)
162 unsigned int e_d_tov;
163 unsigned int r_a_tov;
164};
165
166/**
167 * struct fc_rport_priv - libfc remote port and discovery info
168 * @local_port: The associated local port
169 * @rport: The FC transport remote port
170 * @kref: Reference counter
171 * @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
172 * and RTV exchanges
173 * @ids: The remote port identifiers and roles
174 * @flags: STARTED, REC and RETRY_SUPPORTED flags
175 * @max_seq: Maximum number of concurrent sequences
176 * @disc_id: The discovery identifier
177 * @maxframe_size: The maximum frame size
178 * @retries: The retry count for the current state
179 * @major_retries: The retry count for the entire PLOGI/PRLI state machine
180 * @e_d_tov: Error detect timeout value (in msec)
181 * @r_a_tov: Resource allocation timeout value (in msec)
182 * @rp_mutex: The mutex that protects the remote port
183 * @retry_work: Handle for retries
184 * @event_callback: Callback when READY, FAILED or LOGO states complete
185 * @prli_count: Count of open PRLI sessions in providers
186 * @rcu: Structure used for freeing in an RCU-safe manner
187 */
188struct fc_rport_priv {
189 struct fc_lport *local_port;
190 struct fc_rport *rport;
191 struct kref kref;
192 enum fc_rport_state rp_state;
193 struct fc_rport_identifiers ids;
194 u16 flags;
195 u16 max_seq;
196 u16 disc_id;
197 u16 maxframe_size;
198 unsigned int retries;
199 unsigned int major_retries;
200 unsigned int e_d_tov;
201 unsigned int r_a_tov;
202 struct mutex rp_mutex;
203 struct delayed_work retry_work;
204 enum fc_rport_event event;
205 struct fc_rport_operations *ops;
206 struct list_head peers;
207 struct work_struct event_work;
208 u32 supported_classes;
209 u16 prli_count;
210 struct rcu_head rcu;
211 u16 sp_features;
212 u8 spp_type;
213 void (*lld_event_callback)(struct fc_lport *,
214 struct fc_rport_priv *,
215 enum fc_rport_event);
216};
217
218/**
219 * struct fcoe_dev_stats - fcoe stats structure
220 * @SecondsSinceLastReset: Seconds since the last reset
221 * @TxFrames: Number of transmitted frames
222 * @TxWords: Number of transmitted words
223 * @RxFrames: Number of received frames
224 * @RxWords: Number of received words
225 * @ErrorFrames: Number of received error frames
226 * @DumpedFrames: Number of dumped frames
227 * @LinkFailureCount: Number of link failures
228 * @LossOfSignalCount: Number for signal losses
229 * @InvalidTxWordCount: Number of invalid transmitted words
230 * @InvalidCRCCount: Number of invalid CRCs
231 * @InputRequests: Number of input requests
232 * @OutputRequests: Number of output requests
233 * @ControlRequests: Number of control requests
234 * @InputBytes: Number of received bytes
235 * @OutputBytes: Number of transmitted bytes
236 * @VLinkFailureCount: Number of virtual link failures
237 * @MissDiscAdvCount: Number of missing FIP discovery advertisement
238 */
239struct fcoe_dev_stats {
240 u64 SecondsSinceLastReset;
241 u64 TxFrames;
242 u64 TxWords;
243 u64 RxFrames;
244 u64 RxWords;
245 u64 ErrorFrames;
246 u64 DumpedFrames;
247 u64 LinkFailureCount;
248 u64 LossOfSignalCount;
249 u64 InvalidTxWordCount;
250 u64 InvalidCRCCount;
251 u64 InputRequests;
252 u64 OutputRequests;
253 u64 ControlRequests;
254 u64 InputBytes;
255 u64 OutputBytes;
256 u64 VLinkFailureCount;
257 u64 MissDiscAdvCount;
258};
259
260/**
261 * struct fc_seq_els_data - ELS data used for passing ELS specific responses
262 * @reason: The reason for rejection
263 * @explan: The explanation of the rejection
264 *
265 * Mainly used by the exchange manager layer.
266 */
267struct fc_seq_els_data {
268 enum fc_els_rjt_reason reason;
269 enum fc_els_rjt_explan explan;
270};
271
272/**
273 * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
274 * @lp: The associated local port
275 * @state: The state of the I/O
276 * @ref_cnt: Reference count
277 * @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
278 * host_lock if both are to be held at the same time)
279 * @cmd: The SCSI command (set and clear with the host_lock held)
280 * @list: Tracks queued commands (accessed with the host_lock held)
281 * @timer: The command timer
282 * @tm_done: Completion indicator
283 * @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
284 * @start_time: Timestamp indicating the start of the I/O (in jiffies)
285 * @end_time: Timestamp indicating the end of the I/O (in jiffies)
286 * @last_pkt_time: Timestamp of the last frame received (in jiffies)
287 * @data_len: The length of the data
288 * @cdb_cmd: The CDB command
289 * @xfer_len: The transfer length
290 * @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange
291 * will be set here if DDP was setup)
292 * @xfer_contig_end: The offset into the buffer if the buffer is contiguous
293 * (Tx and Rx)
294 * @max_payload: The maximum payload size (in bytes)
295 * @io_status: SCSI result (upper 24 bits)
296 * @cdb_status: CDB status
297 * @status_code: FCP I/O status
298 * @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
299 * @req_flags: Request flags (bit 0: read bit:1 write)
300 * @scsi_resid: SCSI residule length
301 * @rport: The remote port that the SCSI command is targeted at
302 * @seq_ptr: The sequence that will carry the SCSI command
303 * @recov_retry: Number of recovery retries
304 * @recov_seq: The sequence for REC or SRR
305 */
306struct fc_fcp_pkt {
307 /* Housekeeping information */
308 struct fc_lport *lp;
309 u16 state;
310 atomic_t ref_cnt;
311 spinlock_t scsi_pkt_lock;
312
313 /* SCSI I/O related information */
314 struct scsi_cmnd *cmd;
315 struct list_head list;
316
317 /* Timeout related information */
318 struct timer_list timer;
319 struct completion tm_done;
320 int wait_for_comp;
321 unsigned long start_time;
322 unsigned long end_time;
323 unsigned long last_pkt_time;
324
325 /* SCSI command and data transfer information */
326 u32 data_len;
327
328 /* Transport related veriables */
329 struct fcp_cmnd cdb_cmd;
330 size_t xfer_len;
331 u16 xfer_ddp;
332 u32 xfer_contig_end;
333 u16 max_payload;
334
335 /* SCSI/FCP return status */
336 u32 io_status;
337 u8 cdb_status;
338 u8 status_code;
339 u8 scsi_comp_flags;
340 u32 req_flags;
341 u32 scsi_resid;
342
343 /* Associated structures */
344 struct fc_rport *rport;
345 struct fc_seq *seq_ptr;
346
347 /* Error Processing information */
348 u8 recov_retry;
349 struct fc_seq *recov_seq;
350};
351
352/*
353 * Structure and function definitions for managing Fibre Channel Exchanges
354 * and Sequences
355 *
356 * fc_exch holds state for one exchange and links to its active sequence.
357 *
358 * fc_seq holds the state for an individual sequence.
359 */
360
361struct fc_exch_mgr;
362struct fc_exch_mgr_anchor;
363extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
364
365/**
366 * struct fc_seq - FC sequence
367 * @id: The sequence ID
368 * @ssb_stat: Status flags for the sequence status block (SSB)
369 * @cnt: Number of frames sent so far
370 * @rec_data: FC-4 value for REC
371 */
372struct fc_seq {
373 u8 id;
374 u16 ssb_stat;
375 u16 cnt;
376 u32 rec_data;
377};
378
379#define FC_EX_DONE (1 << 0) /* ep is completed */
380#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
381
382/**
383 * struct fc_exch - Fibre Channel Exchange
384 * @em: Exchange manager
385 * @pool: Exchange pool
386 * @state: The exchange's state
387 * @xid: The exchange ID
388 * @ex_list: Handle used by the EM to track free exchanges
389 * @ex_lock: Lock that protects the exchange
390 * @ex_refcnt: Reference count
391 * @timeout_work: Handle for timeout handler
392 * @lp: The local port that this exchange is on
393 * @oxid: Originator's exchange ID
394 * @rxid: Responder's exchange ID
395 * @oid: Originator's FCID
396 * @sid: Source FCID
397 * @did: Destination FCID
398 * @esb_stat: ESB exchange status
399 * @r_a_tov: Resouce allocation time out value (in msecs)
400 * @seq_id: The next sequence ID to use
401 * @encaps: encapsulation information for lower-level driver
402 * @f_ctl: F_CTL flags for the sequence
403 * @fh_type: The frame type
404 * @class: The class of service
405 * @seq: The sequence in use on this exchange
406 * @resp: Callback for responses on this exchange
407 * @destructor: Called when destroying the exchange
408 * @arg: Passed as a void pointer to the resp() callback
409 *
410 * Locking notes: The ex_lock protects following items:
411 * state, esb_stat, f_ctl, seq.ssb_stat
412 * seq_id
413 * sequence allocation
414 */
415struct fc_exch {
416 struct fc_exch_mgr *em;
417 struct fc_exch_pool *pool;
418 u32 state;
419 u16 xid;
420 struct list_head ex_list;
421 spinlock_t ex_lock;
422 atomic_t ex_refcnt;
423 struct delayed_work timeout_work;
424 struct fc_lport *lp;
425 u16 oxid;
426 u16 rxid;
427 u32 oid;
428 u32 sid;
429 u32 did;
430 u32 esb_stat;
431 u32 r_a_tov;
432 u8 seq_id;
433 u8 encaps;
434 u32 f_ctl;
435 u8 fh_type;
436 enum fc_class class;
437 struct fc_seq seq;
438
439 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
440 void *arg;
441
442 void (*destructor)(struct fc_seq *, void *);
443
444};
445#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
446
447
448struct libfc_function_template {
449 /*
450 * Interface to send a FC frame
451 *
452 * STATUS: REQUIRED
453 */
454 int (*frame_send)(struct fc_lport *, struct fc_frame *);
455
456 /*
457 * Interface to send ELS/CT frames
458 *
459 * STATUS: OPTIONAL
460 */
461 struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
462 struct fc_frame *, unsigned int op,
463 void (*resp)(struct fc_seq *,
464 struct fc_frame *, void *arg),
465 void *arg, u32 timer_msec);
466
467 /*
468 * Send the FC frame payload using a new exchange and sequence.
469 *
470 * The exchange response handler is set in this routine to resp()
471 * function pointer. It can be called in two scenarios: if a timeout
472 * occurs or if a response frame is received for the exchange. The
473 * fc_frame pointer in response handler will also indicate timeout
474 * as error using IS_ERR related macros.
475 *
476 * The exchange destructor handler is also set in this routine.
477 * The destructor handler is invoked by EM layer when exchange
478 * is about to free, this can be used by caller to free its
479 * resources along with exchange free.
480 *
481 * The arg is passed back to resp and destructor handler.
482 *
483 * The timeout value (in msec) for an exchange is set if non zero
484 * timer_msec argument is specified. The timer is canceled when
485 * it fires or when the exchange is done. The exchange timeout handler
486 * is registered by EM layer.
487 *
488 * STATUS: OPTIONAL
489 */
490 struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
491 void (*resp)(struct fc_seq *,
492 struct fc_frame *,
493 void *),
494 void (*destructor)(struct fc_seq *,
495 void *),
496 void *, unsigned int timer_msec);
497
498 /*
499 * Sets up the DDP context for a given exchange id on the given
500 * scatterlist if LLD supports DDP for large receive.
501 *
502 * STATUS: OPTIONAL
503 */
504 int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
505 unsigned int);
506 /*
507 * Completes the DDP transfer and returns the length of data DDPed
508 * for the given exchange id.
509 *
510 * STATUS: OPTIONAL
511 */
512 int (*ddp_done)(struct fc_lport *, u16);
513 /*
514 * Sets up the DDP context for a given exchange id on the given
515 * scatterlist if LLD supports DDP for FCoE target.
516 *
517 * STATUS: OPTIONAL
518 */
519 int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
520 unsigned int);
521 /*
522 * Allow LLD to fill its own Link Error Status Block
523 *
524 * STATUS: OPTIONAL
525 */
526 void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
527 /*
528 * Send a frame using an existing sequence and exchange.
529 *
530 * STATUS: OPTIONAL
531 */
532 int (*seq_send)(struct fc_lport *, struct fc_seq *,
533 struct fc_frame *);
534
535 /*
536 * Send an ELS response using information from the received frame.
537 *
538 * STATUS: OPTIONAL
539 */
540 void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
541 struct fc_seq_els_data *);
542
543 /*
544 * Abort an exchange and sequence. Generally called because of a
545 * exchange timeout or an abort from the upper layer.
546 *
547 * A timer_msec can be specified for abort timeout, if non-zero
548 * timer_msec value is specified then exchange resp handler
549 * will be called with timeout error if no response to abort.
550 *
551 * STATUS: OPTIONAL
552 */
553 int (*seq_exch_abort)(const struct fc_seq *,
554 unsigned int timer_msec);
555
556 /*
557 * Indicate that an exchange/sequence tuple is complete and the memory
558 * allocated for the related objects may be freed.
559 *
560 * STATUS: OPTIONAL
561 */
562 void (*exch_done)(struct fc_seq *);
563
564 /*
565 * Start a new sequence on the same exchange/sequence tuple.
566 *
567 * STATUS: OPTIONAL
568 */
569 struct fc_seq *(*seq_start_next)(struct fc_seq *);
570
571 /*
572 * Set a response handler for the exchange of the sequence.
573 *
574 * STATUS: OPTIONAL
575 */
576 void (*seq_set_resp)(struct fc_seq *sp,
577 void (*resp)(struct fc_seq *, struct fc_frame *,
578 void *),
579 void *arg);
580
581 /*
582 * Assign a sequence for an incoming request frame.
583 *
584 * STATUS: OPTIONAL
585 */
586 struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
587
588 /*
589 * Release the reference on the sequence returned by seq_assign().
590 *
591 * STATUS: OPTIONAL
592 */
593 void (*seq_release)(struct fc_seq *);
594
595 /*
596 * Reset an exchange manager, completing all sequences and exchanges.
597 * If s_id is non-zero, reset only exchanges originating from that FID.
598 * If d_id is non-zero, reset only exchanges sending to that FID.
599 *
600 * STATUS: OPTIONAL
601 */
602 void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
603
604 /*
605 * Flush the rport work queue. Generally used before shutdown.
606 *
607 * STATUS: OPTIONAL
608 */
609 void (*rport_flush_queue)(void);
610
611 /*
612 * Receive a frame for a local port.
613 *
614 * STATUS: OPTIONAL
615 */
616 void (*lport_recv)(struct fc_lport *, struct fc_frame *);
617
618 /*
619 * Reset the local port.
620 *
621 * STATUS: OPTIONAL
622 */
623 int (*lport_reset)(struct fc_lport *);
624
625 /*
626 * Set the local port FC_ID.
627 *
628 * This may be provided by the LLD to allow it to be
629 * notified when the local port is assigned a FC-ID.
630 *
631 * The frame, if non-NULL, is the incoming frame with the
632 * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
633 * address for the LLD. The frame pointer may be NULL if
634 * no MAC is associated with this assignment (LOGO or PLOGI).
635 *
636 * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
637 *
638 * Note: this is called with the local port mutex held.
639 *
640 * STATUS: OPTIONAL
641 */
642 void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
643 struct fc_frame *);
644
645 /*
646 * Create a remote port with a given port ID
647 *
648 * STATUS: OPTIONAL
649 */
650 struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
651
652 /*
653 * Initiates the RP state machine. It is called from the LP module.
654 * This function will issue the following commands to the N_Port
655 * identified by the FC ID provided.
656 *
657 * - PLOGI
658 * - PRLI
659 * - RTV
660 *
661 * STATUS: OPTIONAL
662 */
663 int (*rport_login)(struct fc_rport_priv *);
664
665 /*
666 * Logoff, and remove the rport from the transport if
667 * it had been added. This will send a LOGO to the target.
668 *
669 * STATUS: OPTIONAL
670 */
671 int (*rport_logoff)(struct fc_rport_priv *);
672
673 /*
674 * Receive a request from a remote port.
675 *
676 * STATUS: OPTIONAL
677 */
678 void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
679
680 /*
681 * lookup an rport by it's port ID.
682 *
683 * STATUS: OPTIONAL
684 */
685 struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
686
687 /*
688 * Destroy an rport after final kref_put().
689 * The argument is a pointer to the kref inside the fc_rport_priv.
690 */
691 void (*rport_destroy)(struct kref *);
692
693 /*
694 * Callback routine after the remote port is logged in
695 *
696 * STATUS: OPTIONAL
697 */
698 void (*rport_event_callback)(struct fc_lport *,
699 struct fc_rport_priv *,
700 enum fc_rport_event);
701
702 /*
703 * Send a fcp cmd from fsp pkt.
704 * Called with the SCSI host lock unlocked and irqs disabled.
705 *
706 * The resp handler is called when FCP_RSP received.
707 *
708 * STATUS: OPTIONAL
709 */
710 int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
711 void (*resp)(struct fc_seq *, struct fc_frame *,
712 void *));
713
714 /*
715 * Cleanup the FCP layer, used during link down and reset
716 *
717 * STATUS: OPTIONAL
718 */
719 void (*fcp_cleanup)(struct fc_lport *);
720
721 /*
722 * Abort all I/O on a local port
723 *
724 * STATUS: OPTIONAL
725 */
726 void (*fcp_abort_io)(struct fc_lport *);
727
728 /*
729 * Receive a request for the discovery layer.
730 *
731 * STATUS: OPTIONAL
732 */
733 void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
734
735 /*
736 * Start discovery for a local port.
737 *
738 * STATUS: OPTIONAL
739 */
740 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
741 enum fc_disc_event),
742 struct fc_lport *);
743
744 /*
745 * Stop discovery for a given lport. This will remove
746 * all discovered rports
747 *
748 * STATUS: OPTIONAL
749 */
750 void (*disc_stop) (struct fc_lport *);
751
752 /*
753 * Stop discovery for a given lport. This will block
754 * until all discovered rports are deleted from the
755 * FC transport class
756 *
757 * STATUS: OPTIONAL
758 */
759 void (*disc_stop_final) (struct fc_lport *);
760};
761
762/**
763 * struct fc_disc - Discovery context
764 * @retry_count: Number of retries
765 * @pending: 1 if discovery is pending, 0 if not
766 * @requested: 1 if discovery has been requested, 0 if not
767 * @seq_count: Number of sequences used for discovery
768 * @buf_len: Length of the discovery buffer
769 * @disc_id: Discovery ID
770 * @rports: List of discovered remote ports
771 * @priv: Private pointer for use by discovery code
772 * @disc_mutex: Mutex that protects the discovery context
773 * @partial_buf: Partial name buffer (if names are returned
774 * in multiple frames)
775 * @disc_work: handle for delayed work context
776 * @disc_callback: Callback routine called when discovery completes
777 */
778struct fc_disc {
779 unsigned char retry_count;
780 unsigned char pending;
781 unsigned char requested;
782 unsigned short seq_count;
783 unsigned char buf_len;
784 u16 disc_id;
785
786 struct list_head rports;
787 void *priv;
788 struct mutex disc_mutex;
789 struct fc_gpn_ft_resp partial_buf;
790 struct delayed_work disc_work;
791
792 void (*disc_callback)(struct fc_lport *,
793 enum fc_disc_event);
794};
795
796/*
797 * Local port notifier and events.
798 */
799extern struct blocking_notifier_head fc_lport_notifier_head;
800enum fc_lport_event {
801 FC_LPORT_EV_ADD,
802 FC_LPORT_EV_DEL,
803};
804
805/**
806 * struct fc_lport - Local port
807 * @host: The SCSI host associated with a local port
808 * @ema_list: Exchange manager anchor list
809 * @dns_rdata: The directory server remote port
810 * @ptp_rdata: Point to point remote port
811 * @scsi_priv: FCP layer internal data
812 * @disc: Discovery context
813 * @vports: Child vports if N_Port
814 * @vport: Parent vport if VN_Port
815 * @tt: Libfc function template
816 * @link_up: Link state (1 = link up, 0 = link down)
817 * @qfull: Queue state (1 queue is full, 0 queue is not full)
818 * @state: Identifies the state
819 * @boot_time: Timestamp indicating when the local port came online
820 * @host_stats: SCSI host statistics
821 * @dev_stats: FCoE device stats (TODO: libfc should not be
822 * FCoE aware)
823 * @retry_count: Number of retries in the current state
824 * @port_id: FC Port ID
825 * @wwpn: World Wide Port Name
826 * @wwnn: World Wide Node Name
827 * @service_params: Common service parameters
828 * @e_d_tov: Error detection timeout value
829 * @r_a_tov: Resouce allocation timeout value
830 * @rnid_gen: RNID information
831 * @sg_supp: Indicates if scatter gather is supported
832 * @seq_offload: Indicates if sequence offload is supported
833 * @crc_offload: Indicates if CRC offload is supported
834 * @lro_enabled: Indicates if large receive offload is supported
835 * @does_npiv: Supports multiple vports
836 * @npiv_enabled: Switch/fabric allows NPIV
837 * @mfs: The maximum Fibre Channel payload size
838 * @max_retry_count: The maximum retry attempts
839 * @max_rport_retry_count: The maximum remote port retry attempts
840 * @rport_priv_size: Size needed by driver after struct fc_rport_priv
841 * @lro_xid: The maximum XID for LRO
842 * @lso_max: The maximum large offload send size
843 * @fcts: FC-4 type mask
844 * @lp_mutex: Mutex to protect the local port
845 * @list: Linkage on list of vport peers
846 * @retry_work: Handle to local port for delayed retry context
847 * @prov: Pointers available for use by passive FC-4 providers
848 * @lport_list: Linkage on module-wide list of local ports
849 */
850struct fc_lport {
851 /* Associations */
852 struct Scsi_Host *host;
853 struct list_head ema_list;
854 struct fc_rport_priv *dns_rdata;
855 struct fc_rport_priv *ptp_rdata;
856 void *scsi_priv;
857 struct fc_disc disc;
858
859 /* Virtual port information */
860 struct list_head vports;
861 struct fc_vport *vport;
862
863 /* Operational Information */
864 struct libfc_function_template tt;
865 u8 link_up;
866 u8 qfull;
867 enum fc_lport_state state;
868 unsigned long boot_time;
869 struct fc_host_statistics host_stats;
870 struct fcoe_dev_stats *dev_stats;
871 u8 retry_count;
872
873 /* Fabric information */
874 u32 port_id;
875 u64 wwpn;
876 u64 wwnn;
877 unsigned int service_params;
878 unsigned int e_d_tov;
879 unsigned int r_a_tov;
880 struct fc_els_rnid_gen rnid_gen;
881
882 /* Capabilities */
883 u32 sg_supp:1;
884 u32 seq_offload:1;
885 u32 crc_offload:1;
886 u32 lro_enabled:1;
887 u32 does_npiv:1;
888 u32 npiv_enabled:1;
889 u32 point_to_multipoint:1;
890 u32 mfs;
891 u8 max_retry_count;
892 u8 max_rport_retry_count;
893 u16 rport_priv_size;
894 u16 link_speed;
895 u16 link_supported_speeds;
896 u16 lro_xid;
897 unsigned int lso_max;
898 struct fc_ns_fts fcts;
899
900 /* Miscellaneous */
901 struct mutex lp_mutex;
902 struct list_head list;
903 struct delayed_work retry_work;
904 void *prov[FC_FC4_PROV_SIZE];
905 struct list_head lport_list;
906};
907
908/**
909 * struct fc4_prov - FC-4 provider registration
910 * @prli: Handler for incoming PRLI
911 * @prlo: Handler for session reset
912 * @recv: Handler for incoming request
913 * @module: Pointer to module. May be NULL.
914 */
915struct fc4_prov {
916 int (*prli)(struct fc_rport_priv *, u32 spp_len,
917 const struct fc_els_spp *spp_in,
918 struct fc_els_spp *spp_out);
919 void (*prlo)(struct fc_rport_priv *);
920 void (*recv)(struct fc_lport *, struct fc_frame *);
921 struct module *module;
922};
923
924/*
925 * Register FC-4 provider with libfc.
926 */
927int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
928void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
929
930/*
931 * FC_LPORT HELPER FUNCTIONS
932 *****************************/
933
934/**
935 * fc_lport_test_ready() - Determine if a local port is in the READY state
936 * @lport: The local port to test
937 */
938static inline int fc_lport_test_ready(struct fc_lport *lport)
939{
940 return lport->state == LPORT_ST_READY;
941}
942
943/**
944 * fc_set_wwnn() - Set the World Wide Node Name of a local port
945 * @lport: The local port whose WWNN is to be set
946 * @wwnn: The new WWNN
947 */
948static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
949{
950 lport->wwnn = wwnn;
951}
952
953/**
954 * fc_set_wwpn() - Set the World Wide Port Name of a local port
955 * @lport: The local port whose WWPN is to be set
956 * @wwnn: The new WWPN
957 */
958static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
959{
960 lport->wwpn = wwnn;
961}
962
963/**
964 * fc_lport_state_enter() - Change a local port's state
965 * @lport: The local port whose state is to change
966 * @state: The new state
967 */
968static inline void fc_lport_state_enter(struct fc_lport *lport,
969 enum fc_lport_state state)
970{
971 if (state != lport->state)
972 lport->retry_count = 0;
973 lport->state = state;
974}
975
976/**
977 * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
978 * @lport: The local port whose statistics are to be initialized
979 */
980static inline int fc_lport_init_stats(struct fc_lport *lport)
981{
982 lport->dev_stats = alloc_percpu(struct fcoe_dev_stats);
983 if (!lport->dev_stats)
984 return -ENOMEM;
985 return 0;
986}
987
988/**
989 * fc_lport_free_stats() - Free memory for a local port's statistics
990 * @lport: The local port whose statistics are to be freed
991 */
992static inline void fc_lport_free_stats(struct fc_lport *lport)
993{
994 free_percpu(lport->dev_stats);
995}
996
997/**
998 * lport_priv() - Return the private data from a local port
999 * @lport: The local port whose private data is to be retreived
1000 */
1001static inline void *lport_priv(const struct fc_lport *lport)
1002{
1003 return (void *)(lport + 1);
1004}
1005
1006/**
1007 * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
1008 * LLD private data
1009 * @sht: The SCSI host template
1010 * @priv_size: Size of private data
1011 *
1012 * Returns: libfc lport
1013 */
1014static inline struct fc_lport *
1015libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
1016{
1017 struct fc_lport *lport;
1018 struct Scsi_Host *shost;
1019
1020 shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
1021 if (!shost)
1022 return NULL;
1023 lport = shost_priv(shost);
1024 lport->host = shost;
1025 INIT_LIST_HEAD(&lport->ema_list);
1026 INIT_LIST_HEAD(&lport->vports);
1027 return lport;
1028}
1029
1030/*
1031 * FC_FCP HELPER FUNCTIONS
1032 *****************************/
1033static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
1034{
1035 if (fsp && fsp->cmd)
1036 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
1037 return false;
1038}
1039
1040/*
1041 * LOCAL PORT LAYER
1042 *****************************/
1043int fc_lport_init(struct fc_lport *);
1044int fc_lport_destroy(struct fc_lport *);
1045int fc_fabric_logoff(struct fc_lport *);
1046int fc_fabric_login(struct fc_lport *);
1047void __fc_linkup(struct fc_lport *);
1048void fc_linkup(struct fc_lport *);
1049void __fc_linkdown(struct fc_lport *);
1050void fc_linkdown(struct fc_lport *);
1051void fc_vport_setlink(struct fc_lport *);
1052void fc_vports_linkchange(struct fc_lport *);
1053int fc_lport_config(struct fc_lport *);
1054int fc_lport_reset(struct fc_lport *);
1055int fc_set_mfs(struct fc_lport *, u32 mfs);
1056struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
1057struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
1058int fc_lport_bsg_request(struct fc_bsg_job *);
1059void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
1060void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
1061
1062/*
1063 * REMOTE PORT LAYER
1064 *****************************/
1065int fc_rport_init(struct fc_lport *);
1066void fc_rport_terminate_io(struct fc_rport *);
1067
1068/*
1069 * DISCOVERY LAYER
1070 *****************************/
1071int fc_disc_init(struct fc_lport *);
1072
1073static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
1074{
1075 return container_of(disc, struct fc_lport, disc);
1076}
1077
1078/*
1079 * FCP LAYER
1080 *****************************/
1081int fc_fcp_init(struct fc_lport *);
1082void fc_fcp_destroy(struct fc_lport *);
1083
1084/*
1085 * SCSI INTERACTION LAYER
1086 *****************************/
1087int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
1088int fc_eh_abort(struct scsi_cmnd *);
1089int fc_eh_device_reset(struct scsi_cmnd *);
1090int fc_eh_host_reset(struct scsi_cmnd *);
1091int fc_slave_alloc(struct scsi_device *);
1092int fc_change_queue_depth(struct scsi_device *, int qdepth, int reason);
1093int fc_change_queue_type(struct scsi_device *, int tag_type);
1094
1095/*
1096 * ELS/CT interface
1097 *****************************/
1098int fc_elsct_init(struct fc_lport *);
1099struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
1100 struct fc_frame *,
1101 unsigned int op,
1102 void (*resp)(struct fc_seq *,
1103 struct fc_frame *,
1104 void *arg),
1105 void *arg, u32 timer_msec);
1106void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
1107void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
1108void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
1109 enum fc_rctl, u32 parm_offset);
1110void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
1111 enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
1112
1113
1114/*
1115 * EXCHANGE MANAGER LAYER
1116 *****************************/
1117int fc_exch_init(struct fc_lport *);
1118struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1119 struct fc_exch_mgr *,
1120 bool (*match)(struct fc_frame *));
1121void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1122int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1123struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1124 u16 min_xid, u16 max_xid,
1125 bool (*match)(struct fc_frame *));
1126void fc_exch_mgr_free(struct fc_lport *);
1127void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1128void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1129
1130/*
1131 * Functions for fc_functions_template
1132 */
1133void fc_get_host_speed(struct Scsi_Host *);
1134void fc_get_host_port_state(struct Scsi_Host *);
1135void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1136struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1137
1138#endif /* _LIBFC_H_ */
1/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#ifndef _LIBFC_H_
21#define _LIBFC_H_
22
23#include <linux/timer.h>
24#include <linux/if.h>
25#include <linux/percpu.h>
26
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_fc.h>
29#include <scsi/scsi_bsg_fc.h>
30
31#include <scsi/fc/fc_fcp.h>
32#include <scsi/fc/fc_ns.h>
33#include <scsi/fc/fc_ms.h>
34#include <scsi/fc/fc_els.h>
35#include <scsi/fc/fc_gs.h>
36
37#include <scsi/fc_frame.h>
38
39#define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
40
41/*
42 * libfc error codes
43 */
44#define FC_NO_ERR 0 /* no error */
45#define FC_EX_TIMEOUT 1 /* Exchange timeout */
46#define FC_EX_CLOSED 2 /* Exchange closed */
47
48/**
49 * enum fc_lport_state - Local port states
50 * @LPORT_ST_DISABLED: Disabled
51 * @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
52 * @LPORT_ST_DNS: Waiting for name server remote port to become ready
53 * @LPORT_ST_RPN_ID: Register port name by ID (RPN_ID) sent
54 * @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
55 * @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
56 * @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready
57 * @LPORT_ST_RHBA:
58 * @LPORT_ST_SCR: State Change Register (SCR) sent
59 * @LPORT_ST_READY: Ready for use
60 * @LPORT_ST_LOGO: Local port logout (LOGO) sent
61 * @LPORT_ST_RESET: Local port reset
62 */
63enum fc_lport_state {
64 LPORT_ST_DISABLED = 0,
65 LPORT_ST_FLOGI,
66 LPORT_ST_DNS,
67 LPORT_ST_RNN_ID,
68 LPORT_ST_RSNN_NN,
69 LPORT_ST_RSPN_ID,
70 LPORT_ST_RFT_ID,
71 LPORT_ST_RFF_ID,
72 LPORT_ST_FDMI,
73 LPORT_ST_RHBA,
74 LPORT_ST_RPA,
75 LPORT_ST_DHBA,
76 LPORT_ST_DPRT,
77 LPORT_ST_SCR,
78 LPORT_ST_READY,
79 LPORT_ST_LOGO,
80 LPORT_ST_RESET
81};
82
83enum fc_disc_event {
84 DISC_EV_NONE = 0,
85 DISC_EV_SUCCESS,
86 DISC_EV_FAILED
87};
88
89/**
90 * enum fc_rport_state - Remote port states
91 * @RPORT_ST_INIT: Initialized
92 * @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
93 * @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
94 * @RPORT_ST_PLOGI: Waiting for PLOGI completion
95 * @RPORT_ST_PRLI: Waiting for PRLI completion
96 * @RPORT_ST_RTV: Waiting for RTV completion
97 * @RPORT_ST_READY: Ready for use
98 * @RPORT_ST_ADISC: Discover Address sent
99 * @RPORT_ST_DELETE: Remote port being deleted
100*/
101enum fc_rport_state {
102 RPORT_ST_INIT,
103 RPORT_ST_FLOGI,
104 RPORT_ST_PLOGI_WAIT,
105 RPORT_ST_PLOGI,
106 RPORT_ST_PRLI,
107 RPORT_ST_RTV,
108 RPORT_ST_READY,
109 RPORT_ST_ADISC,
110 RPORT_ST_DELETE,
111};
112
113/**
114 * struct fc_disc_port - temporary discovery port to hold rport identifiers
115 * @lp: Fibre Channel host port instance
116 * @peers: Node for list management during discovery and RSCN processing
117 * @rport_work: Work struct for starting the rport state machine
118 * @port_id: Port ID of the discovered port
119 */
120struct fc_disc_port {
121 struct fc_lport *lp;
122 struct list_head peers;
123 struct work_struct rport_work;
124 u32 port_id;
125};
126
127/**
128 * enum fc_rport_event - Remote port events
129 * @RPORT_EV_NONE: No event
130 * @RPORT_EV_READY: Remote port is ready for use
131 * @RPORT_EV_FAILED: State machine failed, remote port is not ready
132 * @RPORT_EV_STOP: Remote port has been stopped
133 * @RPORT_EV_LOGO: Remote port logout (LOGO) sent
134 */
135enum fc_rport_event {
136 RPORT_EV_NONE = 0,
137 RPORT_EV_READY,
138 RPORT_EV_FAILED,
139 RPORT_EV_STOP,
140 RPORT_EV_LOGO
141};
142
143struct fc_rport_priv;
144
145/**
146 * struct fc_rport_operations - Operations for a remote port
147 * @event_callback: Function to be called for remote port events
148 */
149struct fc_rport_operations {
150 void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
151 enum fc_rport_event);
152};
153
154/**
155 * struct fc_rport_libfc_priv - libfc internal information about a remote port
156 * @local_port: The associated local port
157 * @rp_state: Indicates READY for I/O or DELETE when blocked
158 * @flags: REC and RETRY supported flags
159 * @e_d_tov: Error detect timeout value (in msec)
160 * @r_a_tov: Resource allocation timeout value (in msec)
161 */
162struct fc_rport_libfc_priv {
163 struct fc_lport *local_port;
164 enum fc_rport_state rp_state;
165 u16 flags;
166 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
167 #define FC_RP_FLAGS_RETRY (1 << 1)
168 #define FC_RP_STARTED (1 << 2)
169 #define FC_RP_FLAGS_CONF_REQ (1 << 3)
170 unsigned int e_d_tov;
171 unsigned int r_a_tov;
172};
173
174/**
175 * struct fc_rport_priv - libfc remote port and discovery info
176 * @local_port: The associated local port
177 * @rport: The FC transport remote port
178 * @kref: Reference counter
179 * @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
180 * and RTV exchanges
181 * @ids: The remote port identifiers and roles
182 * @flags: STARTED, REC and RETRY_SUPPORTED flags
183 * @max_seq: Maximum number of concurrent sequences
184 * @disc_id: The discovery identifier
185 * @maxframe_size: The maximum frame size
186 * @retries: The retry count for the current state
187 * @major_retries: The retry count for the entire PLOGI/PRLI state machine
188 * @e_d_tov: Error detect timeout value (in msec)
189 * @r_a_tov: Resource allocation timeout value (in msec)
190 * @rp_mutex: The mutex that protects the remote port
191 * @retry_work: Handle for retries
192 * @event_callback: Callback when READY, FAILED or LOGO states complete
193 * @prli_count: Count of open PRLI sessions in providers
194 * @rcu: Structure used for freeing in an RCU-safe manner
195 */
196struct fc_rport_priv {
197 struct fc_lport *local_port;
198 struct fc_rport *rport;
199 struct kref kref;
200 enum fc_rport_state rp_state;
201 struct fc_rport_identifiers ids;
202 u16 flags;
203 u16 max_seq;
204 u16 disc_id;
205 u16 maxframe_size;
206 unsigned int retries;
207 unsigned int major_retries;
208 unsigned int e_d_tov;
209 unsigned int r_a_tov;
210 struct mutex rp_mutex;
211 struct delayed_work retry_work;
212 enum fc_rport_event event;
213 struct fc_rport_operations *ops;
214 struct list_head peers;
215 struct work_struct event_work;
216 u32 supported_classes;
217 u16 prli_count;
218 struct rcu_head rcu;
219 u16 sp_features;
220 u8 spp_type;
221 void (*lld_event_callback)(struct fc_lport *,
222 struct fc_rport_priv *,
223 enum fc_rport_event);
224};
225
226/**
227 * struct fc_stats - fc stats structure
228 * @SecondsSinceLastReset: Seconds since the last reset
229 * @TxFrames: Number of transmitted frames
230 * @TxWords: Number of transmitted words
231 * @RxFrames: Number of received frames
232 * @RxWords: Number of received words
233 * @ErrorFrames: Number of received error frames
234 * @DumpedFrames: Number of dumped frames
235 * @FcpPktAllocFails: Number of fcp packet allocation failures
236 * @FcpPktAborts: Number of fcp packet aborts
237 * @FcpFrameAllocFails: Number of fcp frame allocation failures
238 * @LinkFailureCount: Number of link failures
239 * @LossOfSignalCount: Number for signal losses
240 * @InvalidTxWordCount: Number of invalid transmitted words
241 * @InvalidCRCCount: Number of invalid CRCs
242 * @InputRequests: Number of input requests
243 * @OutputRequests: Number of output requests
244 * @ControlRequests: Number of control requests
245 * @InputBytes: Number of received bytes
246 * @OutputBytes: Number of transmitted bytes
247 * @VLinkFailureCount: Number of virtual link failures
248 * @MissDiscAdvCount: Number of missing FIP discovery advertisement
249 */
250struct fc_stats {
251 u64 SecondsSinceLastReset;
252 u64 TxFrames;
253 u64 TxWords;
254 u64 RxFrames;
255 u64 RxWords;
256 u64 ErrorFrames;
257 u64 DumpedFrames;
258 u64 FcpPktAllocFails;
259 u64 FcpPktAborts;
260 u64 FcpFrameAllocFails;
261 u64 LinkFailureCount;
262 u64 LossOfSignalCount;
263 u64 InvalidTxWordCount;
264 u64 InvalidCRCCount;
265 u64 InputRequests;
266 u64 OutputRequests;
267 u64 ControlRequests;
268 u64 InputBytes;
269 u64 OutputBytes;
270 u64 VLinkFailureCount;
271 u64 MissDiscAdvCount;
272};
273
274/**
275 * struct fc_seq_els_data - ELS data used for passing ELS specific responses
276 * @reason: The reason for rejection
277 * @explan: The explanation of the rejection
278 *
279 * Mainly used by the exchange manager layer.
280 */
281struct fc_seq_els_data {
282 enum fc_els_rjt_reason reason;
283 enum fc_els_rjt_explan explan;
284};
285
286/**
287 * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
288 * @lp: The associated local port
289 * @state: The state of the I/O
290 * @ref_cnt: Reference count
291 * @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
292 * host_lock if both are to be held at the same time)
293 * @cmd: The SCSI command (set and clear with the host_lock held)
294 * @list: Tracks queued commands (accessed with the host_lock held)
295 * @timer: The command timer
296 * @tm_done: Completion indicator
297 * @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
298 * @data_len: The length of the data
299 * @cdb_cmd: The CDB command
300 * @xfer_len: The transfer length
301 * @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange
302 * will be set here if DDP was setup)
303 * @xfer_contig_end: The offset into the buffer if the buffer is contiguous
304 * (Tx and Rx)
305 * @max_payload: The maximum payload size (in bytes)
306 * @io_status: SCSI result (upper 24 bits)
307 * @cdb_status: CDB status
308 * @status_code: FCP I/O status
309 * @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
310 * @req_flags: Request flags (bit 0: read bit:1 write)
311 * @scsi_resid: SCSI residule length
312 * @rport: The remote port that the SCSI command is targeted at
313 * @seq_ptr: The sequence that will carry the SCSI command
314 * @recov_retry: Number of recovery retries
315 * @recov_seq: The sequence for REC or SRR
316 */
317struct fc_fcp_pkt {
318 spinlock_t scsi_pkt_lock;
319 atomic_t ref_cnt;
320
321 /* SCSI command and data transfer information */
322 u32 data_len;
323
324 /* SCSI I/O related information */
325 struct scsi_cmnd *cmd;
326 struct list_head list;
327
328 /* Housekeeping information */
329 struct fc_lport *lp;
330 u8 state;
331
332 /* SCSI/FCP return status */
333 u8 cdb_status;
334 u8 status_code;
335 u8 scsi_comp_flags;
336 u32 io_status;
337 u32 req_flags;
338 u32 scsi_resid;
339
340 /* Transport related veriables */
341 size_t xfer_len;
342 struct fcp_cmnd cdb_cmd;
343 u32 xfer_contig_end;
344 u16 max_payload;
345 u16 xfer_ddp;
346
347 /* Associated structures */
348 struct fc_rport *rport;
349 struct fc_seq *seq_ptr;
350
351 /* Timeout/error related information */
352 struct timer_list timer;
353 int wait_for_comp;
354 u32 recov_retry;
355 struct fc_seq *recov_seq;
356 struct completion tm_done;
357} ____cacheline_aligned_in_smp;
358
359/*
360 * Structure and function definitions for managing Fibre Channel Exchanges
361 * and Sequences
362 *
363 * fc_exch holds state for one exchange and links to its active sequence.
364 *
365 * fc_seq holds the state for an individual sequence.
366 */
367
368struct fc_exch_mgr;
369struct fc_exch_mgr_anchor;
370extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
371
372/**
373 * struct fc_seq - FC sequence
374 * @id: The sequence ID
375 * @ssb_stat: Status flags for the sequence status block (SSB)
376 * @cnt: Number of frames sent so far
377 * @rec_data: FC-4 value for REC
378 */
379struct fc_seq {
380 u8 id;
381 u16 ssb_stat;
382 u16 cnt;
383 u32 rec_data;
384};
385
386#define FC_EX_DONE (1 << 0) /* ep is completed */
387#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
388
389/**
390 * struct fc_exch - Fibre Channel Exchange
391 * @em: Exchange manager
392 * @pool: Exchange pool
393 * @state: The exchange's state
394 * @xid: The exchange ID
395 * @ex_list: Handle used by the EM to track free exchanges
396 * @ex_lock: Lock that protects the exchange
397 * @ex_refcnt: Reference count
398 * @timeout_work: Handle for timeout handler
399 * @lp: The local port that this exchange is on
400 * @oxid: Originator's exchange ID
401 * @rxid: Responder's exchange ID
402 * @oid: Originator's FCID
403 * @sid: Source FCID
404 * @did: Destination FCID
405 * @esb_stat: ESB exchange status
406 * @r_a_tov: Resouce allocation time out value (in msecs)
407 * @seq_id: The next sequence ID to use
408 * @encaps: encapsulation information for lower-level driver
409 * @f_ctl: F_CTL flags for the sequence
410 * @fh_type: The frame type
411 * @class: The class of service
412 * @seq: The sequence in use on this exchange
413 * @resp_active: Number of tasks that are concurrently executing @resp().
414 * @resp_task: If @resp_active > 0, either the task executing @resp(), the
415 * task that has been interrupted to execute the soft-IRQ
416 * executing @resp() or NULL if more than one task is executing
417 * @resp concurrently.
418 * @resp_wq: Waitqueue for the tasks waiting on @resp_active.
419 * @resp: Callback for responses on this exchange
420 * @destructor: Called when destroying the exchange
421 * @arg: Passed as a void pointer to the resp() callback
422 *
423 * Locking notes: The ex_lock protects following items:
424 * state, esb_stat, f_ctl, seq.ssb_stat
425 * seq_id
426 * sequence allocation
427 */
428struct fc_exch {
429 spinlock_t ex_lock;
430 atomic_t ex_refcnt;
431 enum fc_class class;
432 struct fc_exch_mgr *em;
433 struct fc_exch_pool *pool;
434 struct list_head ex_list;
435 struct fc_lport *lp;
436 u32 esb_stat;
437 u8 state;
438 u8 fh_type;
439 u8 seq_id;
440 u8 encaps;
441 u16 xid;
442 u16 oxid;
443 u16 rxid;
444 u32 oid;
445 u32 sid;
446 u32 did;
447 u32 r_a_tov;
448 u32 f_ctl;
449 struct fc_seq seq;
450 int resp_active;
451 struct task_struct *resp_task;
452 wait_queue_head_t resp_wq;
453 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
454 void *arg;
455 void (*destructor)(struct fc_seq *, void *);
456 struct delayed_work timeout_work;
457} ____cacheline_aligned_in_smp;
458#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
459
460
461struct libfc_function_template {
462 /*
463 * Interface to send a FC frame
464 *
465 * STATUS: REQUIRED
466 */
467 int (*frame_send)(struct fc_lport *, struct fc_frame *);
468
469 /*
470 * Interface to send ELS/CT frames
471 *
472 * STATUS: OPTIONAL
473 */
474 struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
475 struct fc_frame *, unsigned int op,
476 void (*resp)(struct fc_seq *,
477 struct fc_frame *, void *arg),
478 void *arg, u32 timer_msec);
479
480 /*
481 * Send the FC frame payload using a new exchange and sequence.
482 *
483 * The exchange response handler is set in this routine to resp()
484 * function pointer. It can be called in two scenarios: if a timeout
485 * occurs or if a response frame is received for the exchange. The
486 * fc_frame pointer in response handler will also indicate timeout
487 * as error using IS_ERR related macros.
488 *
489 * The exchange destructor handler is also set in this routine.
490 * The destructor handler is invoked by EM layer when exchange
491 * is about to free, this can be used by caller to free its
492 * resources along with exchange free.
493 *
494 * The arg is passed back to resp and destructor handler.
495 *
496 * The timeout value (in msec) for an exchange is set if non zero
497 * timer_msec argument is specified. The timer is canceled when
498 * it fires or when the exchange is done. The exchange timeout handler
499 * is registered by EM layer.
500 *
501 * STATUS: OPTIONAL
502 */
503 struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
504 void (*resp)(struct fc_seq *,
505 struct fc_frame *,
506 void *),
507 void (*destructor)(struct fc_seq *,
508 void *),
509 void *, unsigned int timer_msec);
510
511 /*
512 * Sets up the DDP context for a given exchange id on the given
513 * scatterlist if LLD supports DDP for large receive.
514 *
515 * STATUS: OPTIONAL
516 */
517 int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
518 unsigned int);
519 /*
520 * Completes the DDP transfer and returns the length of data DDPed
521 * for the given exchange id.
522 *
523 * STATUS: OPTIONAL
524 */
525 int (*ddp_done)(struct fc_lport *, u16);
526 /*
527 * Sets up the DDP context for a given exchange id on the given
528 * scatterlist if LLD supports DDP for target.
529 *
530 * STATUS: OPTIONAL
531 */
532 int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
533 unsigned int);
534 /*
535 * Allow LLD to fill its own Link Error Status Block
536 *
537 * STATUS: OPTIONAL
538 */
539 void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
540 /*
541 * Send a frame using an existing sequence and exchange.
542 *
543 * STATUS: OPTIONAL
544 */
545 int (*seq_send)(struct fc_lport *, struct fc_seq *,
546 struct fc_frame *);
547
548 /*
549 * Send an ELS response using information from the received frame.
550 *
551 * STATUS: OPTIONAL
552 */
553 void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
554 struct fc_seq_els_data *);
555
556 /*
557 * Abort an exchange and sequence. Generally called because of a
558 * exchange timeout or an abort from the upper layer.
559 *
560 * A timer_msec can be specified for abort timeout, if non-zero
561 * timer_msec value is specified then exchange resp handler
562 * will be called with timeout error if no response to abort.
563 *
564 * STATUS: OPTIONAL
565 */
566 int (*seq_exch_abort)(const struct fc_seq *,
567 unsigned int timer_msec);
568
569 /*
570 * Indicate that an exchange/sequence tuple is complete and the memory
571 * allocated for the related objects may be freed.
572 *
573 * STATUS: OPTIONAL
574 */
575 void (*exch_done)(struct fc_seq *);
576
577 /*
578 * Start a new sequence on the same exchange/sequence tuple.
579 *
580 * STATUS: OPTIONAL
581 */
582 struct fc_seq *(*seq_start_next)(struct fc_seq *);
583
584 /*
585 * Set a response handler for the exchange of the sequence.
586 *
587 * STATUS: OPTIONAL
588 */
589 void (*seq_set_resp)(struct fc_seq *sp,
590 void (*resp)(struct fc_seq *, struct fc_frame *,
591 void *),
592 void *arg);
593
594 /*
595 * Assign a sequence for an incoming request frame.
596 *
597 * STATUS: OPTIONAL
598 */
599 struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
600
601 /*
602 * Release the reference on the sequence returned by seq_assign().
603 *
604 * STATUS: OPTIONAL
605 */
606 void (*seq_release)(struct fc_seq *);
607
608 /*
609 * Reset an exchange manager, completing all sequences and exchanges.
610 * If s_id is non-zero, reset only exchanges originating from that FID.
611 * If d_id is non-zero, reset only exchanges sending to that FID.
612 *
613 * STATUS: OPTIONAL
614 */
615 void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
616
617 /*
618 * Flush the rport work queue. Generally used before shutdown.
619 *
620 * STATUS: OPTIONAL
621 */
622 void (*rport_flush_queue)(void);
623
624 /*
625 * Receive a frame for a local port.
626 *
627 * STATUS: OPTIONAL
628 */
629 void (*lport_recv)(struct fc_lport *, struct fc_frame *);
630
631 /*
632 * Reset the local port.
633 *
634 * STATUS: OPTIONAL
635 */
636 int (*lport_reset)(struct fc_lport *);
637
638 /*
639 * Set the local port FC_ID.
640 *
641 * This may be provided by the LLD to allow it to be
642 * notified when the local port is assigned a FC-ID.
643 *
644 * The frame, if non-NULL, is the incoming frame with the
645 * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
646 * address for the LLD. The frame pointer may be NULL if
647 * no MAC is associated with this assignment (LOGO or PLOGI).
648 *
649 * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
650 *
651 * Note: this is called with the local port mutex held.
652 *
653 * STATUS: OPTIONAL
654 */
655 void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
656 struct fc_frame *);
657
658 /*
659 * Create a remote port with a given port ID
660 *
661 * STATUS: OPTIONAL
662 */
663 struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
664
665 /*
666 * Initiates the RP state machine. It is called from the LP module.
667 * This function will issue the following commands to the N_Port
668 * identified by the FC ID provided.
669 *
670 * - PLOGI
671 * - PRLI
672 * - RTV
673 *
674 * STATUS: OPTIONAL
675 */
676 int (*rport_login)(struct fc_rport_priv *);
677
678 /*
679 * Logoff, and remove the rport from the transport if
680 * it had been added. This will send a LOGO to the target.
681 *
682 * STATUS: OPTIONAL
683 */
684 int (*rport_logoff)(struct fc_rport_priv *);
685
686 /*
687 * Receive a request from a remote port.
688 *
689 * STATUS: OPTIONAL
690 */
691 void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
692
693 /*
694 * lookup an rport by it's port ID.
695 *
696 * STATUS: OPTIONAL
697 */
698 struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
699
700 /*
701 * Destroy an rport after final kref_put().
702 * The argument is a pointer to the kref inside the fc_rport_priv.
703 */
704 void (*rport_destroy)(struct kref *);
705
706 /*
707 * Callback routine after the remote port is logged in
708 *
709 * STATUS: OPTIONAL
710 */
711 void (*rport_event_callback)(struct fc_lport *,
712 struct fc_rport_priv *,
713 enum fc_rport_event);
714
715 /*
716 * Send a fcp cmd from fsp pkt.
717 * Called with the SCSI host lock unlocked and irqs disabled.
718 *
719 * The resp handler is called when FCP_RSP received.
720 *
721 * STATUS: OPTIONAL
722 */
723 int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
724 void (*resp)(struct fc_seq *, struct fc_frame *,
725 void *));
726
727 /*
728 * Cleanup the FCP layer, used during link down and reset
729 *
730 * STATUS: OPTIONAL
731 */
732 void (*fcp_cleanup)(struct fc_lport *);
733
734 /*
735 * Abort all I/O on a local port
736 *
737 * STATUS: OPTIONAL
738 */
739 void (*fcp_abort_io)(struct fc_lport *);
740
741 /*
742 * Receive a request for the discovery layer.
743 *
744 * STATUS: OPTIONAL
745 */
746 void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
747
748 /*
749 * Start discovery for a local port.
750 *
751 * STATUS: OPTIONAL
752 */
753 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
754 enum fc_disc_event),
755 struct fc_lport *);
756
757 /*
758 * Stop discovery for a given lport. This will remove
759 * all discovered rports
760 *
761 * STATUS: OPTIONAL
762 */
763 void (*disc_stop) (struct fc_lport *);
764
765 /*
766 * Stop discovery for a given lport. This will block
767 * until all discovered rports are deleted from the
768 * FC transport class
769 *
770 * STATUS: OPTIONAL
771 */
772 void (*disc_stop_final) (struct fc_lport *);
773};
774
775/**
776 * struct fc_disc - Discovery context
777 * @retry_count: Number of retries
778 * @pending: 1 if discovery is pending, 0 if not
779 * @requested: 1 if discovery has been requested, 0 if not
780 * @seq_count: Number of sequences used for discovery
781 * @buf_len: Length of the discovery buffer
782 * @disc_id: Discovery ID
783 * @rports: List of discovered remote ports
784 * @priv: Private pointer for use by discovery code
785 * @disc_mutex: Mutex that protects the discovery context
786 * @partial_buf: Partial name buffer (if names are returned
787 * in multiple frames)
788 * @disc_work: handle for delayed work context
789 * @disc_callback: Callback routine called when discovery completes
790 */
791struct fc_disc {
792 unsigned char retry_count;
793 unsigned char pending;
794 unsigned char requested;
795 unsigned short seq_count;
796 unsigned char buf_len;
797 u16 disc_id;
798
799 struct list_head rports;
800 void *priv;
801 struct mutex disc_mutex;
802 struct fc_gpn_ft_resp partial_buf;
803 struct delayed_work disc_work;
804
805 void (*disc_callback)(struct fc_lport *,
806 enum fc_disc_event);
807};
808
809/*
810 * Local port notifier and events.
811 */
812extern struct blocking_notifier_head fc_lport_notifier_head;
813enum fc_lport_event {
814 FC_LPORT_EV_ADD,
815 FC_LPORT_EV_DEL,
816};
817
818/**
819 * struct fc_lport - Local port
820 * @host: The SCSI host associated with a local port
821 * @ema_list: Exchange manager anchor list
822 * @dns_rdata: The directory server remote port
823 * @ms_rdata: The management server remote port
824 * @ptp_rdata: Point to point remote port
825 * @scsi_priv: FCP layer internal data
826 * @disc: Discovery context
827 * @vports: Child vports if N_Port
828 * @vport: Parent vport if VN_Port
829 * @tt: Libfc function template
830 * @link_up: Link state (1 = link up, 0 = link down)
831 * @qfull: Queue state (1 queue is full, 0 queue is not full)
832 * @state: Identifies the state
833 * @boot_time: Timestamp indicating when the local port came online
834 * @host_stats: SCSI host statistics
835 * @stats: FC local port stats (TODO separate libfc LLD stats)
836 * @retry_count: Number of retries in the current state
837 * @port_id: FC Port ID
838 * @wwpn: World Wide Port Name
839 * @wwnn: World Wide Node Name
840 * @service_params: Common service parameters
841 * @e_d_tov: Error detection timeout value
842 * @r_a_tov: Resouce allocation timeout value
843 * @rnid_gen: RNID information
844 * @sg_supp: Indicates if scatter gather is supported
845 * @seq_offload: Indicates if sequence offload is supported
846 * @crc_offload: Indicates if CRC offload is supported
847 * @lro_enabled: Indicates if large receive offload is supported
848 * @does_npiv: Supports multiple vports
849 * @npiv_enabled: Switch/fabric allows NPIV
850 * @mfs: The maximum Fibre Channel payload size
851 * @max_retry_count: The maximum retry attempts
852 * @max_rport_retry_count: The maximum remote port retry attempts
853 * @rport_priv_size: Size needed by driver after struct fc_rport_priv
854 * @lro_xid: The maximum XID for LRO
855 * @lso_max: The maximum large offload send size
856 * @fcts: FC-4 type mask
857 * @lp_mutex: Mutex to protect the local port
858 * @list: Linkage on list of vport peers
859 * @retry_work: Handle to local port for delayed retry context
860 * @prov: Pointers available for use by passive FC-4 providers
861 * @lport_list: Linkage on module-wide list of local ports
862 */
863struct fc_lport {
864 /* Associations */
865 struct Scsi_Host *host;
866 struct list_head ema_list;
867 struct fc_rport_priv *dns_rdata;
868 struct fc_rport_priv *ms_rdata;
869 struct fc_rport_priv *ptp_rdata;
870 void *scsi_priv;
871 struct fc_disc disc;
872
873 /* Virtual port information */
874 struct list_head vports;
875 struct fc_vport *vport;
876
877 /* Operational Information */
878 struct libfc_function_template tt;
879 u8 link_up;
880 u8 qfull;
881 enum fc_lport_state state;
882 unsigned long boot_time;
883 struct fc_host_statistics host_stats;
884 struct fc_stats __percpu *stats;
885 u8 retry_count;
886
887 /* Fabric information */
888 u32 port_id;
889 u64 wwpn;
890 u64 wwnn;
891 unsigned int service_params;
892 unsigned int e_d_tov;
893 unsigned int r_a_tov;
894 struct fc_els_rnid_gen rnid_gen;
895
896 /* Capabilities */
897 u32 sg_supp:1;
898 u32 seq_offload:1;
899 u32 crc_offload:1;
900 u32 lro_enabled:1;
901 u32 does_npiv:1;
902 u32 npiv_enabled:1;
903 u32 point_to_multipoint:1;
904 u32 fdmi_enabled:1;
905 u32 mfs;
906 u8 max_retry_count;
907 u8 max_rport_retry_count;
908 u16 rport_priv_size;
909 u16 link_speed;
910 u16 link_supported_speeds;
911 u16 lro_xid;
912 unsigned int lso_max;
913 struct fc_ns_fts fcts;
914
915 /* Miscellaneous */
916 struct mutex lp_mutex;
917 struct list_head list;
918 struct delayed_work retry_work;
919 void *prov[FC_FC4_PROV_SIZE];
920 struct list_head lport_list;
921};
922
923/**
924 * struct fc4_prov - FC-4 provider registration
925 * @prli: Handler for incoming PRLI
926 * @prlo: Handler for session reset
927 * @recv: Handler for incoming request
928 * @module: Pointer to module. May be NULL.
929 */
930struct fc4_prov {
931 int (*prli)(struct fc_rport_priv *, u32 spp_len,
932 const struct fc_els_spp *spp_in,
933 struct fc_els_spp *spp_out);
934 void (*prlo)(struct fc_rport_priv *);
935 void (*recv)(struct fc_lport *, struct fc_frame *);
936 struct module *module;
937};
938
939/*
940 * Register FC-4 provider with libfc.
941 */
942int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
943void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
944
945/*
946 * FC_LPORT HELPER FUNCTIONS
947 *****************************/
948
949/**
950 * fc_lport_test_ready() - Determine if a local port is in the READY state
951 * @lport: The local port to test
952 */
953static inline int fc_lport_test_ready(struct fc_lport *lport)
954{
955 return lport->state == LPORT_ST_READY;
956}
957
958/**
959 * fc_set_wwnn() - Set the World Wide Node Name of a local port
960 * @lport: The local port whose WWNN is to be set
961 * @wwnn: The new WWNN
962 */
963static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
964{
965 lport->wwnn = wwnn;
966}
967
968/**
969 * fc_set_wwpn() - Set the World Wide Port Name of a local port
970 * @lport: The local port whose WWPN is to be set
971 * @wwnn: The new WWPN
972 */
973static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
974{
975 lport->wwpn = wwnn;
976}
977
978/**
979 * fc_lport_state_enter() - Change a local port's state
980 * @lport: The local port whose state is to change
981 * @state: The new state
982 */
983static inline void fc_lport_state_enter(struct fc_lport *lport,
984 enum fc_lport_state state)
985{
986 if (state != lport->state)
987 lport->retry_count = 0;
988 lport->state = state;
989}
990
991/**
992 * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
993 * @lport: The local port whose statistics are to be initialized
994 */
995static inline int fc_lport_init_stats(struct fc_lport *lport)
996{
997 lport->stats = alloc_percpu(struct fc_stats);
998 if (!lport->stats)
999 return -ENOMEM;
1000 return 0;
1001}
1002
1003/**
1004 * fc_lport_free_stats() - Free memory for a local port's statistics
1005 * @lport: The local port whose statistics are to be freed
1006 */
1007static inline void fc_lport_free_stats(struct fc_lport *lport)
1008{
1009 free_percpu(lport->stats);
1010}
1011
1012/**
1013 * lport_priv() - Return the private data from a local port
1014 * @lport: The local port whose private data is to be retreived
1015 */
1016static inline void *lport_priv(const struct fc_lport *lport)
1017{
1018 return (void *)(lport + 1);
1019}
1020
1021/**
1022 * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
1023 * LLD private data
1024 * @sht: The SCSI host template
1025 * @priv_size: Size of private data
1026 *
1027 * Returns: libfc lport
1028 */
1029static inline struct fc_lport *
1030libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
1031{
1032 struct fc_lport *lport;
1033 struct Scsi_Host *shost;
1034
1035 shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
1036 if (!shost)
1037 return NULL;
1038 lport = shost_priv(shost);
1039 lport->host = shost;
1040 INIT_LIST_HEAD(&lport->ema_list);
1041 INIT_LIST_HEAD(&lport->vports);
1042 return lport;
1043}
1044
1045/*
1046 * FC_FCP HELPER FUNCTIONS
1047 *****************************/
1048static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
1049{
1050 if (fsp && fsp->cmd)
1051 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
1052 return false;
1053}
1054
1055/*
1056 * LOCAL PORT LAYER
1057 *****************************/
1058int fc_lport_init(struct fc_lport *);
1059int fc_lport_destroy(struct fc_lport *);
1060int fc_fabric_logoff(struct fc_lport *);
1061int fc_fabric_login(struct fc_lport *);
1062void __fc_linkup(struct fc_lport *);
1063void fc_linkup(struct fc_lport *);
1064void __fc_linkdown(struct fc_lport *);
1065void fc_linkdown(struct fc_lport *);
1066void fc_vport_setlink(struct fc_lport *);
1067void fc_vports_linkchange(struct fc_lport *);
1068int fc_lport_config(struct fc_lport *);
1069int fc_lport_reset(struct fc_lport *);
1070int fc_set_mfs(struct fc_lport *, u32 mfs);
1071struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
1072struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
1073int fc_lport_bsg_request(struct fc_bsg_job *);
1074void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
1075void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
1076
1077/*
1078 * REMOTE PORT LAYER
1079 *****************************/
1080int fc_rport_init(struct fc_lport *);
1081void fc_rport_terminate_io(struct fc_rport *);
1082
1083/*
1084 * DISCOVERY LAYER
1085 *****************************/
1086void fc_disc_init(struct fc_lport *);
1087void fc_disc_config(struct fc_lport *, void *);
1088
1089static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
1090{
1091 return container_of(disc, struct fc_lport, disc);
1092}
1093
1094/*
1095 * FCP LAYER
1096 *****************************/
1097int fc_fcp_init(struct fc_lport *);
1098void fc_fcp_destroy(struct fc_lport *);
1099
1100/*
1101 * SCSI INTERACTION LAYER
1102 *****************************/
1103int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
1104int fc_eh_abort(struct scsi_cmnd *);
1105int fc_eh_device_reset(struct scsi_cmnd *);
1106int fc_eh_host_reset(struct scsi_cmnd *);
1107int fc_slave_alloc(struct scsi_device *);
1108
1109/*
1110 * ELS/CT interface
1111 *****************************/
1112int fc_elsct_init(struct fc_lport *);
1113struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
1114 struct fc_frame *,
1115 unsigned int op,
1116 void (*resp)(struct fc_seq *,
1117 struct fc_frame *,
1118 void *arg),
1119 void *arg, u32 timer_msec);
1120void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
1121void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
1122void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
1123 enum fc_rctl, u32 parm_offset);
1124void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
1125 enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
1126
1127
1128/*
1129 * EXCHANGE MANAGER LAYER
1130 *****************************/
1131int fc_exch_init(struct fc_lport *);
1132void fc_exch_update_stats(struct fc_lport *lport);
1133struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1134 struct fc_exch_mgr *,
1135 bool (*match)(struct fc_frame *));
1136void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1137int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1138struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1139 u16 min_xid, u16 max_xid,
1140 bool (*match)(struct fc_frame *));
1141void fc_exch_mgr_free(struct fc_lport *);
1142void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1143void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1144
1145/*
1146 * Functions for fc_functions_template
1147 */
1148void fc_get_host_speed(struct Scsi_Host *);
1149void fc_get_host_port_state(struct Scsi_Host *);
1150void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1151struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1152
1153#endif /* _LIBFC_H_ */