aboutsummaryrefslogtreecommitdiffstats
path: root/include/scsi/libfc.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/scsi/libfc.h')
-rw-r--r--include/scsi/libfc.h938
1 files changed, 938 insertions, 0 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
new file mode 100644
index 000000000000..9f2876397dda
--- /dev/null
+++ b/include/scsi/libfc.h
@@ -0,0 +1,938 @@
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
26#include <scsi/scsi_transport.h>
27#include <scsi/scsi_transport_fc.h>
28
29#include <scsi/fc/fc_fcp.h>
30#include <scsi/fc/fc_ns.h>
31#include <scsi/fc/fc_els.h>
32#include <scsi/fc/fc_gs.h>
33
34#include <scsi/fc_frame.h>
35
36#define LIBFC_DEBUG
37
38#ifdef LIBFC_DEBUG
39/* Log messages */
40#define FC_DBG(fmt, args...) \
41 do { \
42 printk(KERN_INFO "%s " fmt, __func__, ##args); \
43 } while (0)
44#else
45#define FC_DBG(fmt, args...)
46#endif
47
48/*
49 * libfc error codes
50 */
51#define FC_NO_ERR 0 /* no error */
52#define FC_EX_TIMEOUT 1 /* Exchange timeout */
53#define FC_EX_CLOSED 2 /* Exchange closed */
54
55/* some helpful macros */
56
57#define ntohll(x) be64_to_cpu(x)
58#define htonll(x) cpu_to_be64(x)
59
60#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
61
62#define hton24(p, v) do { \
63 p[0] = (((v) >> 16) & 0xFF); \
64 p[1] = (((v) >> 8) & 0xFF); \
65 p[2] = ((v) & 0xFF); \
66 } while (0)
67
68/*
69 * FC HBA status
70 */
71#define FC_PAUSE (1 << 1)
72#define FC_LINK_UP (1 << 0)
73
74enum fc_lport_state {
75 LPORT_ST_NONE = 0,
76 LPORT_ST_FLOGI,
77 LPORT_ST_DNS,
78 LPORT_ST_RPN_ID,
79 LPORT_ST_RFT_ID,
80 LPORT_ST_SCR,
81 LPORT_ST_READY,
82 LPORT_ST_LOGO,
83 LPORT_ST_RESET
84};
85
86enum fc_disc_event {
87 DISC_EV_NONE = 0,
88 DISC_EV_SUCCESS,
89 DISC_EV_FAILED
90};
91
92enum fc_rport_state {
93 RPORT_ST_NONE = 0,
94 RPORT_ST_INIT, /* initialized */
95 RPORT_ST_PLOGI, /* waiting for PLOGI completion */
96 RPORT_ST_PRLI, /* waiting for PRLI completion */
97 RPORT_ST_RTV, /* waiting for RTV completion */
98 RPORT_ST_READY, /* ready for use */
99 RPORT_ST_LOGO, /* port logout sent */
100};
101
102enum fc_rport_trans_state {
103 FC_PORTSTATE_ROGUE,
104 FC_PORTSTATE_REAL,
105};
106
107/**
108 * struct fc_disc_port - temporary discovery port to hold rport identifiers
109 * @lp: Fibre Channel host port instance
110 * @peers: node for list management during discovery and RSCN processing
111 * @ids: identifiers structure to pass to fc_remote_port_add()
112 * @rport_work: work struct for starting the rport state machine
113 */
114struct fc_disc_port {
115 struct fc_lport *lp;
116 struct list_head peers;
117 struct fc_rport_identifiers ids;
118 struct work_struct rport_work;
119};
120
121enum fc_rport_event {
122 RPORT_EV_NONE = 0,
123 RPORT_EV_CREATED,
124 RPORT_EV_FAILED,
125 RPORT_EV_STOP,
126 RPORT_EV_LOGO
127};
128
129struct fc_rport_operations {
130 void (*event_callback)(struct fc_lport *, struct fc_rport *,
131 enum fc_rport_event);
132};
133
134/**
135 * struct fc_rport_libfc_priv - libfc internal information about a remote port
136 * @local_port: Fibre Channel host port instance
137 * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
138 * @flags: REC and RETRY supported flags
139 * @max_seq: maximum number of concurrent sequences
140 * @retries: retry count in current state
141 * @e_d_tov: error detect timeout value (in msec)
142 * @r_a_tov: resource allocation timeout value (in msec)
143 * @rp_mutex: mutex protects rport
144 * @retry_work:
145 * @event_callback: Callback for rport READY, FAILED or LOGO
146 */
147struct fc_rport_libfc_priv {
148 struct fc_lport *local_port;
149 enum fc_rport_state rp_state;
150 u16 flags;
151 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
152 #define FC_RP_FLAGS_RETRY (1 << 1)
153 u16 max_seq;
154 unsigned int retries;
155 unsigned int e_d_tov;
156 unsigned int r_a_tov;
157 enum fc_rport_trans_state trans_state;
158 struct mutex rp_mutex;
159 struct delayed_work retry_work;
160 enum fc_rport_event event;
161 struct fc_rport_operations *ops;
162 struct list_head peers;
163 struct work_struct event_work;
164};
165
166#define PRIV_TO_RPORT(x) \
167 (struct fc_rport *)((void *)x - sizeof(struct fc_rport));
168#define RPORT_TO_PRIV(x) \
169 (struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));
170
171struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);
172
173static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
174{
175 rport->node_name = wwnn;
176 rport->port_name = wwpn;
177}
178
179/*
180 * fcoe stats structure
181 */
182struct fcoe_dev_stats {
183 u64 SecondsSinceLastReset;
184 u64 TxFrames;
185 u64 TxWords;
186 u64 RxFrames;
187 u64 RxWords;
188 u64 ErrorFrames;
189 u64 DumpedFrames;
190 u64 LinkFailureCount;
191 u64 LossOfSignalCount;
192 u64 InvalidTxWordCount;
193 u64 InvalidCRCCount;
194 u64 InputRequests;
195 u64 OutputRequests;
196 u64 ControlRequests;
197 u64 InputMegabytes;
198 u64 OutputMegabytes;
199};
200
201/*
202 * els data is used for passing ELS respone specific
203 * data to send ELS response mainly using infomation
204 * in exchange and sequence in EM layer.
205 */
206struct fc_seq_els_data {
207 struct fc_frame *fp;
208 enum fc_els_rjt_reason reason;
209 enum fc_els_rjt_explan explan;
210};
211
212/*
213 * FCP request structure, one for each scsi cmd request
214 */
215struct fc_fcp_pkt {
216 /*
217 * housekeeping stuff
218 */
219 struct fc_lport *lp; /* handle to hba struct */
220 u16 state; /* scsi_pkt state state */
221 u16 tgt_flags; /* target flags */
222 atomic_t ref_cnt; /* fcp pkt ref count */
223 spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
224 * if both are held at the same time */
225 /*
226 * SCSI I/O related stuff
227 */
228 struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
229 * under host lock */
230 struct list_head list; /* tracks queued commands. access under
231 * host lock */
232 /*
233 * timeout related stuff
234 */
235 struct timer_list timer; /* command timer */
236 struct completion tm_done;
237 int wait_for_comp;
238 unsigned long start_time; /* start jiffie */
239 unsigned long end_time; /* end jiffie */
240 unsigned long last_pkt_time; /* jiffies of last frame received */
241
242 /*
243 * scsi cmd and data transfer information
244 */
245 u32 data_len;
246 /*
247 * transport related veriables
248 */
249 struct fcp_cmnd cdb_cmd;
250 size_t xfer_len;
251 u32 xfer_contig_end; /* offset of end of contiguous xfer */
252 u16 max_payload; /* max payload size in bytes */
253
254 /*
255 * scsi/fcp return status
256 */
257 u32 io_status; /* SCSI result upper 24 bits */
258 u8 cdb_status;
259 u8 status_code; /* FCP I/O status */
260 /* bit 3 Underrun bit 2: overrun */
261 u8 scsi_comp_flags;
262 u32 req_flags; /* bit 0: read bit:1 write */
263 u32 scsi_resid; /* residule length */
264
265 struct fc_rport *rport; /* remote port pointer */
266 struct fc_seq *seq_ptr; /* current sequence pointer */
267 /*
268 * Error Processing
269 */
270 u8 recov_retry; /* count of recovery retries */
271 struct fc_seq *recov_seq; /* sequence for REC or SRR */
272};
273
274/*
275 * Structure and function definitions for managing Fibre Channel Exchanges
276 * and Sequences
277 *
278 * fc_exch holds state for one exchange and links to its active sequence.
279 *
280 * fc_seq holds the state for an individual sequence.
281 */
282
283struct fc_exch_mgr;
284
285/*
286 * Sequence.
287 */
288struct fc_seq {
289 u8 id; /* seq ID */
290 u16 ssb_stat; /* status flags for sequence status block */
291 u16 cnt; /* frames sent so far on sequence */
292 u32 rec_data; /* FC-4 value for REC */
293};
294
295#define FC_EX_DONE (1 << 0) /* ep is completed */
296#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
297
298/*
299 * Exchange.
300 *
301 * Locking notes: The ex_lock protects following items:
302 * state, esb_stat, f_ctl, seq.ssb_stat
303 * seq_id
304 * sequence allocation
305 */
306struct fc_exch {
307 struct fc_exch_mgr *em; /* exchange manager */
308 u32 state; /* internal driver state */
309 u16 xid; /* our exchange ID */
310 struct list_head ex_list; /* free or busy list linkage */
311 spinlock_t ex_lock; /* lock covering exchange state */
312 atomic_t ex_refcnt; /* reference counter */
313 struct delayed_work timeout_work; /* timer for upper level protocols */
314 struct fc_lport *lp; /* fc device instance */
315 u16 oxid; /* originator's exchange ID */
316 u16 rxid; /* responder's exchange ID */
317 u32 oid; /* originator's FCID */
318 u32 sid; /* source FCID */
319 u32 did; /* destination FCID */
320 u32 esb_stat; /* exchange status for ESB */
321 u32 r_a_tov; /* r_a_tov from rport (msec) */
322 u8 seq_id; /* next sequence ID to use */
323 u32 f_ctl; /* F_CTL flags for sequences */
324 u8 fh_type; /* frame type */
325 enum fc_class class; /* class of service */
326 struct fc_seq seq; /* single sequence */
327 /*
328 * Handler for responses to this current exchange.
329 */
330 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
331 void (*destructor)(struct fc_seq *, void *);
332 /*
333 * arg is passed as void pointer to exchange
334 * resp and destructor handlers
335 */
336 void *arg;
337};
338#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
339
340struct libfc_function_template {
341
342 /**
343 * Mandatory Fields
344 *
345 * These handlers must be implemented by the LLD.
346 */
347
348 /*
349 * Interface to send a FC frame
350 */
351 int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
352
353 /**
354 * Optional Fields
355 *
356 * The LLD may choose to implement any of the following handlers.
357 * If LLD doesn't specify hander and leaves its pointer NULL then
358 * the default libfc function will be used for that handler.
359 */
360
361 /**
362 * ELS/CT interfaces
363 */
364
365 /*
366 * elsct_send - sends ELS/CT frame
367 */
368 struct fc_seq *(*elsct_send)(struct fc_lport *lport,
369 struct fc_rport *rport,
370 struct fc_frame *fp,
371 unsigned int op,
372 void (*resp)(struct fc_seq *,
373 struct fc_frame *fp,
374 void *arg),
375 void *arg, u32 timer_msec);
376 /**
377 * Exhance Manager interfaces
378 */
379
380 /*
381 * Send the FC frame payload using a new exchange and sequence.
382 *
383 * The frame pointer with some of the header's fields must be
384 * filled before calling exch_seq_send(), those fields are,
385 *
386 * - routing control
387 * - FC port did
388 * - FC port sid
389 * - FC header type
390 * - frame control
391 * - parameter or relative offset
392 *
393 * The exchange response handler is set in this routine to resp()
394 * function pointer. It can be called in two scenarios: if a timeout
395 * occurs or if a response frame is received for the exchange. The
396 * fc_frame pointer in response handler will also indicate timeout
397 * as error using IS_ERR related macros.
398 *
399 * The exchange destructor handler is also set in this routine.
400 * The destructor handler is invoked by EM layer when exchange
401 * is about to free, this can be used by caller to free its
402 * resources along with exchange free.
403 *
404 * The arg is passed back to resp and destructor handler.
405 *
406 * The timeout value (in msec) for an exchange is set if non zero
407 * timer_msec argument is specified. The timer is canceled when
408 * it fires or when the exchange is done. The exchange timeout handler
409 * is registered by EM layer.
410 */
411 struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
412 struct fc_frame *fp,
413 void (*resp)(struct fc_seq *sp,
414 struct fc_frame *fp,
415 void *arg),
416 void (*destructor)(struct fc_seq *sp,
417 void *arg),
418 void *arg, unsigned int timer_msec);
419
420 /*
421 * send a frame using existing sequence and exchange.
422 */
423 int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
424 struct fc_frame *fp);
425
426 /*
427 * Send ELS response using mainly infomation
428 * in exchange and sequence in EM layer.
429 */
430 void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
431 struct fc_seq_els_data *els_data);
432
433 /*
434 * Abort an exchange and sequence. Generally called because of a
435 * exchange timeout or an abort from the upper layer.
436 *
437 * A timer_msec can be specified for abort timeout, if non-zero
438 * timer_msec value is specified then exchange resp handler
439 * will be called with timeout error if no response to abort.
440 */
441 int (*seq_exch_abort)(const struct fc_seq *req_sp,
442 unsigned int timer_msec);
443
444 /*
445 * Indicate that an exchange/sequence tuple is complete and the memory
446 * allocated for the related objects may be freed.
447 */
448 void (*exch_done)(struct fc_seq *sp);
449
450 /*
451 * Assigns a EM and a free XID for an new exchange and then
452 * allocates a new exchange and sequence pair.
453 * The fp can be used to determine free XID.
454 */
455 struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
456
457 /*
458 * Release previously assigned XID by exch_get API.
459 * The LLD may implement this if XID is assigned by LLD
460 * in exch_get().
461 */
462 void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
463 u16 ex_id);
464
465 /*
466 * Start a new sequence on the same exchange/sequence tuple.
467 */
468 struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
469
470 /*
471 * Reset an exchange manager, completing all sequences and exchanges.
472 * If s_id is non-zero, reset only exchanges originating from that FID.
473 * If d_id is non-zero, reset only exchanges sending to that FID.
474 */
475 void (*exch_mgr_reset)(struct fc_exch_mgr *,
476 u32 s_id, u32 d_id);
477
478 void (*rport_flush_queue)(void);
479 /**
480 * Local Port interfaces
481 */
482
483 /*
484 * Receive a frame to a local port.
485 */
486 void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
487 struct fc_frame *fp);
488
489 int (*lport_reset)(struct fc_lport *);
490
491 /**
492 * Remote Port interfaces
493 */
494
495 /*
496 * Initiates the RP state machine. It is called from the LP module.
497 * This function will issue the following commands to the N_Port
498 * identified by the FC ID provided.
499 *
500 * - PLOGI
501 * - PRLI
502 * - RTV
503 */
504 int (*rport_login)(struct fc_rport *rport);
505
506 /*
507 * Logoff, and remove the rport from the transport if
508 * it had been added. This will send a LOGO to the target.
509 */
510 int (*rport_logoff)(struct fc_rport *rport);
511
512 /*
513 * Recieve a request from a remote port.
514 */
515 void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
516 struct fc_rport *);
517
518 struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
519
520 /**
521 * FCP interfaces
522 */
523
524 /*
525 * Send a fcp cmd from fsp pkt.
526 * Called with the SCSI host lock unlocked and irqs disabled.
527 *
528 * The resp handler is called when FCP_RSP received.
529 *
530 */
531 int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
532 void (*resp)(struct fc_seq *, struct fc_frame *fp,
533 void *arg));
534
535 /*
536 * Used at least durring linkdown and reset
537 */
538 void (*fcp_cleanup)(struct fc_lport *lp);
539
540 /*
541 * Abort all I/O on a local port
542 */
543 void (*fcp_abort_io)(struct fc_lport *lp);
544
545 /**
546 * Discovery interfaces
547 */
548
549 void (*disc_recv_req)(struct fc_seq *,
550 struct fc_frame *, struct fc_lport *);
551
552 /*
553 * Start discovery for a local port.
554 */
555 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
556 enum fc_disc_event),
557 struct fc_lport *);
558
559 /*
560 * Stop discovery for a given lport. This will remove
561 * all discovered rports
562 */
563 void (*disc_stop) (struct fc_lport *);
564
565 /*
566 * Stop discovery for a given lport. This will block
567 * until all discovered rports are deleted from the
568 * FC transport class
569 */
570 void (*disc_stop_final) (struct fc_lport *);
571};
572
573/* information used by the discovery layer */
574struct fc_disc {
575 unsigned char retry_count;
576 unsigned char delay;
577 unsigned char pending;
578 unsigned char requested;
579 unsigned short seq_count;
580 unsigned char buf_len;
581 enum fc_disc_event event;
582
583 void (*disc_callback)(struct fc_lport *,
584 enum fc_disc_event);
585
586 struct list_head rports;
587 struct fc_lport *lport;
588 struct mutex disc_mutex;
589 struct fc_gpn_ft_resp partial_buf; /* partial name buffer */
590 struct delayed_work disc_work;
591};
592
593struct fc_lport {
594 struct list_head list;
595
596 /* Associations */
597 struct Scsi_Host *host;
598 struct fc_exch_mgr *emp;
599 struct fc_rport *dns_rp;
600 struct fc_rport *ptp_rp;
601 void *scsi_priv;
602 struct fc_disc disc;
603
604 /* Operational Information */
605 struct libfc_function_template tt;
606 u16 link_status;
607 enum fc_lport_state state;
608 unsigned long boot_time;
609
610 struct fc_host_statistics host_stats;
611 struct fcoe_dev_stats *dev_stats[NR_CPUS];
612 u64 wwpn;
613 u64 wwnn;
614 u8 retry_count;
615
616 /* Capabilities */
617 u32 sg_supp:1; /* scatter gather supported */
618 u32 seq_offload:1; /* seq offload supported */
619 u32 crc_offload:1; /* crc offload supported */
620 u32 lro_enabled:1; /* large receive offload */
621 u32 mfs; /* max FC payload size */
622 unsigned int service_params;
623 unsigned int e_d_tov;
624 unsigned int r_a_tov;
625 u8 max_retry_count;
626 u16 link_speed;
627 u16 link_supported_speeds;
628 u16 lro_xid; /* max xid for fcoe lro */
629 struct fc_ns_fts fcts; /* FC-4 type masks */
630 struct fc_els_rnid_gen rnid_gen; /* RNID information */
631
632 /* Semaphores */
633 struct mutex lp_mutex;
634
635 /* Miscellaneous */
636 struct delayed_work retry_work;
637 struct delayed_work disc_work;
638};
639
640/**
641 * FC_LPORT HELPER FUNCTIONS
642 *****************************/
643static inline void *lport_priv(const struct fc_lport *lp)
644{
645 return (void *)(lp + 1);
646}
647
648static inline int fc_lport_test_ready(struct fc_lport *lp)
649{
650 return lp->state == LPORT_ST_READY;
651}
652
653static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
654{
655 lp->wwnn = wwnn;
656}
657
658static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
659{
660 lp->wwpn = wwnn;
661}
662
663static inline void fc_lport_state_enter(struct fc_lport *lp,
664 enum fc_lport_state state)
665{
666 if (state != lp->state)
667 lp->retry_count = 0;
668 lp->state = state;
669}
670
671
672/**
673 * LOCAL PORT LAYER
674 *****************************/
675int fc_lport_init(struct fc_lport *lp);
676
677/*
678 * Destroy the specified local port by finding and freeing all
679 * fc_rports associated with it and then by freeing the fc_lport
680 * itself.
681 */
682int fc_lport_destroy(struct fc_lport *lp);
683
684/*
685 * Logout the specified local port from the fabric
686 */
687int fc_fabric_logoff(struct fc_lport *lp);
688
689/*
690 * Initiate the LP state machine. This handler will use fc_host_attr
691 * to store the FLOGI service parameters, so fc_host_attr must be
692 * initialized before calling this handler.
693 */
694int fc_fabric_login(struct fc_lport *lp);
695
696/*
697 * The link is up for the given local port.
698 */
699void fc_linkup(struct fc_lport *);
700
701/*
702 * Link is down for the given local port.
703 */
704void fc_linkdown(struct fc_lport *);
705
706/*
707 * Pause and unpause traffic.
708 */
709void fc_pause(struct fc_lport *);
710void fc_unpause(struct fc_lport *);
711
712/*
713 * Configure the local port.
714 */
715int fc_lport_config(struct fc_lport *);
716
717/*
718 * Reset the local port.
719 */
720int fc_lport_reset(struct fc_lport *);
721
722/*
723 * Set the mfs or reset
724 */
725int fc_set_mfs(struct fc_lport *lp, u32 mfs);
726
727
728/**
729 * REMOTE PORT LAYER
730 *****************************/
731int fc_rport_init(struct fc_lport *lp);
732void fc_rport_terminate_io(struct fc_rport *rp);
733
734/**
735 * DISCOVERY LAYER
736 *****************************/
737int fc_disc_init(struct fc_lport *lp);
738
739
740/**
741 * SCSI LAYER
742 *****************************/
743/*
744 * Initialize the SCSI block of libfc
745 */
746int fc_fcp_init(struct fc_lport *);
747
748/*
749 * This section provides an API which allows direct interaction
750 * with the SCSI-ml. Each of these functions satisfies a function
751 * pointer defined in Scsi_Host and therefore is always called
752 * directly from the SCSI-ml.
753 */
754int fc_queuecommand(struct scsi_cmnd *sc_cmd,
755 void (*done)(struct scsi_cmnd *));
756
757/*
758 * complete processing of a fcp packet
759 *
760 * This function may sleep if a fsp timer is pending.
761 * The host lock must not be held by caller.
762 */
763void fc_fcp_complete(struct fc_fcp_pkt *fsp);
764
765/*
766 * Send an ABTS frame to the target device. The sc_cmd argument
767 * is a pointer to the SCSI command to be aborted.
768 */
769int fc_eh_abort(struct scsi_cmnd *sc_cmd);
770
771/*
772 * Reset a LUN by sending send the tm cmd to the target.
773 */
774int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);
775
776/*
777 * Reset the host adapter.
778 */
779int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);
780
781/*
782 * Check rport status.
783 */
784int fc_slave_alloc(struct scsi_device *sdev);
785
786/*
787 * Adjust the queue depth.
788 */
789int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);
790
791/*
792 * Change the tag type.
793 */
794int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
795
796/*
797 * Free memory pools used by the FCP layer.
798 */
799void fc_fcp_destroy(struct fc_lport *);
800
801/**
802 * ELS/CT interface
803 *****************************/
804/*
805 * Initializes ELS/CT interface
806 */
807int fc_elsct_init(struct fc_lport *lp);
808
809
810/**
811 * EXCHANGE MANAGER LAYER
812 *****************************/
813/*
814 * Initializes Exchange Manager related
815 * function pointers in struct libfc_function_template.
816 */
817int fc_exch_init(struct fc_lport *lp);
818
819/*
820 * Allocates an Exchange Manager (EM).
821 *
822 * The EM manages exchanges for their allocation and
823 * free, also allows exchange lookup for received
824 * frame.
825 *
826 * The class is used for initializing FC class of
827 * allocated exchange from EM.
828 *
829 * The min_xid and max_xid will limit new
830 * exchange ID (XID) within this range for
831 * a new exchange.
832 * The LLD may choose to have multiple EMs,
833 * e.g. one EM instance per CPU receive thread in LLD.
834 * The LLD can use exch_get() of struct libfc_function_template
835 * to specify XID for a new exchange within
836 * a specified EM instance.
837 *
838 * The em_idx to uniquely identify an EM instance.
839 */
840struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
841 enum fc_class class,
842 u16 min_xid,
843 u16 max_xid);
844
845/*
846 * Free an exchange manager.
847 */
848void fc_exch_mgr_free(struct fc_exch_mgr *mp);
849
850/*
851 * Receive a frame on specified local port and exchange manager.
852 */
853void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
854 struct fc_frame *fp);
855
856/*
857 * This function is for exch_seq_send function pointer in
858 * struct libfc_function_template, see comment block on
859 * exch_seq_send for description of this function.
860 */
861struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
862 struct fc_frame *fp,
863 void (*resp)(struct fc_seq *sp,
864 struct fc_frame *fp,
865 void *arg),
866 void (*destructor)(struct fc_seq *sp,
867 void *arg),
868 void *arg, u32 timer_msec);
869
870/*
871 * send a frame using existing sequence and exchange.
872 */
873int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp);
874
875/*
876 * Send ELS response using mainly infomation
877 * in exchange and sequence in EM layer.
878 */
879void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
880 struct fc_seq_els_data *els_data);
881
882/*
883 * This function is for seq_exch_abort function pointer in
884 * struct libfc_function_template, see comment block on
885 * seq_exch_abort for description of this function.
886 */
887int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec);
888
889/*
890 * Indicate that an exchange/sequence tuple is complete and the memory
891 * allocated for the related objects may be freed.
892 */
893void fc_exch_done(struct fc_seq *sp);
894
895/*
896 * Assigns a EM and XID for a frame and then allocates
897 * a new exchange and sequence pair.
898 * The fp can be used to determine free XID.
899 */
900struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);
901
902/*
903 * Allocate a new exchange and sequence pair.
904 * if ex_id is zero then next free exchange id
905 * from specified exchange manger mp will be assigned.
906 */
907struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
908 struct fc_frame *fp, u16 ex_id);
909/*
910 * Start a new sequence on the same exchange as the supplied sequence.
911 */
912struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
913
914/*
915 * Reset an exchange manager, completing all sequences and exchanges.
916 * If s_id is non-zero, reset only exchanges originating from that FID.
917 * If d_id is non-zero, reset only exchanges sending to that FID.
918 */
919void fc_exch_mgr_reset(struct fc_exch_mgr *, u32 s_id, u32 d_id);
920
921/*
922 * Functions for fc_functions_template
923 */
924void fc_get_host_speed(struct Scsi_Host *shost);
925void fc_get_host_port_type(struct Scsi_Host *shost);
926void fc_get_host_port_state(struct Scsi_Host *shost);
927void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
928struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
929
930/*
931 * module setup functions.
932 */
933int fc_setup_exch_mgr(void);
934void fc_destroy_exch_mgr(void);
935int fc_setup_rport(void);
936void fc_destroy_rport(void);
937
938#endif /* _LIBFC_H_ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 14:32:45 -0500