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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright(c) 2007 Intel Corporation. All rights reserved.
4 *
5 * Maintained at www.Open-FCoE.org
6 */
7
8#ifndef _LIBFC_H_
9#define _LIBFC_H_
10
11#include <linux/timer.h>
12#include <linux/if.h>
13#include <linux/percpu.h>
14#include <linux/refcount.h>
15
16#include <scsi/scsi_transport.h>
17#include <scsi/scsi_transport_fc.h>
18#include <scsi/scsi_bsg_fc.h>
19
20#include <scsi/fc/fc_fcp.h>
21#include <scsi/fc/fc_ns.h>
22#include <scsi/fc/fc_ms.h>
23#include <scsi/fc/fc_els.h>
24#include <scsi/fc/fc_gs.h>
25
26#include <scsi/fc_frame.h>
27
28#define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
29
30/*
31 * libfc error codes
32 */
33#define FC_NO_ERR 0 /* no error */
34#define FC_EX_TIMEOUT 1 /* Exchange timeout */
35#define FC_EX_CLOSED 2 /* Exchange closed */
36#define FC_EX_ALLOC_ERR 3 /* Exchange allocation failed */
37#define FC_EX_XMIT_ERR 4 /* Exchange transmit failed */
38#define FC_EX_ELS_RJT 5 /* ELS rejected */
39#define FC_EX_INV_LOGIN 6 /* Login not completed */
40#define FC_EX_SEQ_ERR 6 /* Exchange sequence error */
41
42/**
43 * enum fc_lport_state - Local port states
44 * @LPORT_ST_DISABLED: Disabled
45 * @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
46 * @LPORT_ST_DNS: Waiting for name server remote port to become ready
47 * @LPORT_ST_RNN_ID: Register port name by ID (RNN_ID) sent
48 * @LPORT_ST_RSNN_NN: Waiting for host symbolic node name
49 * @LPORT_ST_RSPN_ID: Waiting for host symbolic port name
50 * @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
51 * @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
52 * @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready
53 * @LPORT_ST_RHBA: Register HBA
54 * @LPORT_ST_RPA: Register Port Attributes
55 * @LPORT_ST_DHBA: Deregister HBA
56 * @LPORT_ST_DPRT: Deregister Port
57 * @LPORT_ST_SCR: State Change Register (SCR) sent
58 * @LPORT_ST_READY: Ready for use
59 * @LPORT_ST_LOGO: Local port logout (LOGO) sent
60 * @LPORT_ST_RESET: Local port reset
61 */
62enum fc_lport_state {
63 LPORT_ST_DISABLED = 0,
64 LPORT_ST_FLOGI,
65 LPORT_ST_DNS,
66 LPORT_ST_RNN_ID,
67 LPORT_ST_RSNN_NN,
68 LPORT_ST_RSPN_ID,
69 LPORT_ST_RFT_ID,
70 LPORT_ST_RFF_ID,
71 LPORT_ST_FDMI,
72 LPORT_ST_RHBA,
73 LPORT_ST_RPA,
74 LPORT_ST_DHBA,
75 LPORT_ST_DPRT,
76 LPORT_ST_SCR,
77 LPORT_ST_READY,
78 LPORT_ST_LOGO,
79 LPORT_ST_RESET
80};
81
82enum fc_disc_event {
83 DISC_EV_NONE = 0,
84 DISC_EV_SUCCESS,
85 DISC_EV_FAILED
86};
87
88/**
89 * enum fc_rport_state - Remote port states
90 * @RPORT_ST_INIT: Initialized
91 * @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
92 * @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
93 * @RPORT_ST_PLOGI: Waiting for PLOGI completion
94 * @RPORT_ST_PRLI: Waiting for PRLI completion
95 * @RPORT_ST_RTV: Waiting for RTV completion
96 * @RPORT_ST_READY: Ready for use
97 * @RPORT_ST_ADISC: Discover Address sent
98 * @RPORT_ST_DELETE: Remote port being deleted
99*/
100enum fc_rport_state {
101 RPORT_ST_INIT,
102 RPORT_ST_FLOGI,
103 RPORT_ST_PLOGI_WAIT,
104 RPORT_ST_PLOGI,
105 RPORT_ST_PRLI,
106 RPORT_ST_RTV,
107 RPORT_ST_READY,
108 RPORT_ST_ADISC,
109 RPORT_ST_DELETE,
110};
111
112/**
113 * struct fc_disc_port - temporary discovery port to hold rport identifiers
114 * @lp: Fibre Channel host port instance
115 * @peers: Node for list management during discovery and RSCN processing
116 * @rport_work: Work struct for starting the rport state machine
117 * @port_id: Port ID of the discovered port
118 */
119struct fc_disc_port {
120 struct fc_lport *lp;
121 struct list_head peers;
122 struct work_struct rport_work;
123 u32 port_id;
124};
125
126/**
127 * enum fc_rport_event - Remote port events
128 * @RPORT_EV_NONE: No event
129 * @RPORT_EV_READY: Remote port is ready for use
130 * @RPORT_EV_FAILED: State machine failed, remote port is not ready
131 * @RPORT_EV_STOP: Remote port has been stopped
132 * @RPORT_EV_LOGO: Remote port logout (LOGO) sent
133 */
134enum fc_rport_event {
135 RPORT_EV_NONE = 0,
136 RPORT_EV_READY,
137 RPORT_EV_FAILED,
138 RPORT_EV_STOP,
139 RPORT_EV_LOGO
140};
141
142struct fc_rport_priv;
143
144/**
145 * struct fc_rport_operations - Operations for a remote port
146 * @event_callback: Function to be called for remote port events
147 */
148struct fc_rport_operations {
149 void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
150 enum fc_rport_event);
151};
152
153/**
154 * struct fc_rport_libfc_priv - libfc internal information about a remote port
155 * @local_port: The associated local port
156 * @rp_state: Indicates READY for I/O or DELETE when blocked
157 * @flags: REC and RETRY supported flags
158 * @e_d_tov: Error detect timeout value (in msec)
159 * @r_a_tov: Resource allocation timeout value (in msec)
160 */
161struct fc_rport_libfc_priv {
162 struct fc_lport *local_port;
163 enum fc_rport_state rp_state;
164 u16 flags;
165 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
166 #define FC_RP_FLAGS_RETRY (1 << 1)
167 #define FC_RP_STARTED (1 << 2)
168 #define FC_RP_FLAGS_CONF_REQ (1 << 3)
169 unsigned int e_d_tov;
170 unsigned int r_a_tov;
171};
172
173/**
174 * struct fc_rport_priv - libfc remote port and discovery info
175 * @local_port: The associated local port
176 * @rport: The FC transport remote port
177 * @kref: Reference counter
178 * @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
179 * and RTV exchanges
180 * @ids: The remote port identifiers and roles
181 * @flags: STARTED, REC and RETRY_SUPPORTED flags
182 * @max_seq: Maximum number of concurrent sequences
183 * @disc_id: The discovery identifier
184 * @maxframe_size: The maximum frame size
185 * @retries: The retry count for the current state
186 * @major_retries: The retry count for the entire PLOGI/PRLI state machine
187 * @e_d_tov: Error detect timeout value (in msec)
188 * @r_a_tov: Resource allocation timeout value (in msec)
189 * @rp_mutex: The mutex that protects the remote port
190 * @retry_work: Handle for retries
191 * @lld_event_callback: Callback when READY, FAILED or LOGO states complete
192 * @prli_count: Count of open PRLI sessions in providers
193 * @rcu: Structure used for freeing in an RCU-safe manner
194 */
195struct fc_rport_priv {
196 struct fc_lport *local_port;
197 struct fc_rport *rport;
198 struct kref kref;
199 enum fc_rport_state rp_state;
200 struct fc_rport_identifiers ids;
201 u16 flags;
202 u16 max_seq;
203 u16 disc_id;
204 u16 maxframe_size;
205 unsigned int retries;
206 unsigned int major_retries;
207 unsigned int e_d_tov;
208 unsigned int r_a_tov;
209 struct mutex rp_mutex;
210 struct delayed_work retry_work;
211 enum fc_rport_event event;
212 struct fc_rport_operations *ops;
213 struct list_head peers;
214 struct work_struct event_work;
215 u32 supported_classes;
216 u16 prli_count;
217 struct rcu_head rcu;
218 u16 sp_features;
219 u8 spp_type;
220 void (*lld_event_callback)(struct fc_lport *,
221 struct fc_rport_priv *,
222 enum fc_rport_event);
223};
224
225/**
226 * struct fc_stats - fc stats structure
227 * @SecondsSinceLastReset: Seconds since the last reset
228 * @TxFrames: Number of transmitted frames
229 * @TxWords: Number of transmitted words
230 * @RxFrames: Number of received frames
231 * @RxWords: Number of received words
232 * @ErrorFrames: Number of received error frames
233 * @DumpedFrames: Number of dumped frames
234 * @FcpPktAllocFails: Number of fcp packet allocation failures
235 * @FcpPktAborts: Number of fcp packet aborts
236 * @FcpFrameAllocFails: Number of fcp frame allocation failures
237 * @LinkFailureCount: Number of link failures
238 * @LossOfSignalCount: Number for signal losses
239 * @InvalidTxWordCount: Number of invalid transmitted words
240 * @InvalidCRCCount: Number of invalid CRCs
241 * @InputRequests: Number of input requests
242 * @OutputRequests: Number of output requests
243 * @ControlRequests: Number of control requests
244 * @InputBytes: Number of received bytes
245 * @OutputBytes: Number of transmitted bytes
246 * @VLinkFailureCount: Number of virtual link failures
247 * @MissDiscAdvCount: Number of missing FIP discovery advertisement
248 */
249struct fc_stats {
250 u64 SecondsSinceLastReset;
251 u64 TxFrames;
252 u64 TxWords;
253 u64 RxFrames;
254 u64 RxWords;
255 u64 ErrorFrames;
256 u64 DumpedFrames;
257 u64 FcpPktAllocFails;
258 u64 FcpPktAborts;
259 u64 FcpFrameAllocFails;
260 u64 LinkFailureCount;
261 u64 LossOfSignalCount;
262 u64 InvalidTxWordCount;
263 u64 InvalidCRCCount;
264 u64 InputRequests;
265 u64 OutputRequests;
266 u64 ControlRequests;
267 u64 InputBytes;
268 u64 OutputBytes;
269 u64 VLinkFailureCount;
270 u64 MissDiscAdvCount;
271};
272
273/**
274 * struct fc_seq_els_data - ELS data used for passing ELS specific responses
275 * @reason: The reason for rejection
276 * @explan: The explanation of the rejection
277 *
278 * Mainly used by the exchange manager layer.
279 */
280struct fc_seq_els_data {
281 enum fc_els_rjt_reason reason;
282 enum fc_els_rjt_explan explan;
283};
284
285/**
286 * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
287 * @lp: The associated local port
288 * @state: The state of the I/O
289 * @ref_cnt: Reference count
290 * @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
291 * host_lock if both are to be held at the same time)
292 * @cmd: The SCSI command (set and clear with the host_lock held)
293 * @list: Tracks queued commands (accessed with the host_lock held)
294 * @timer: The command timer
295 * @tm_done: Completion indicator
296 * @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
297 * @timer_delay: FCP packet timer delay 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 refcount_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 int timer_delay;
355 u32 recov_retry;
356 struct fc_seq *recov_seq;
357 struct completion tm_done;
358} ____cacheline_aligned_in_smp;
359
360/*
361 * @fsp should be tested and set under the scsi_pkt_queue lock
362 */
363struct libfc_cmd_priv {
364 struct fc_fcp_pkt *fsp;
365 u32 resid_len;
366 u8 status;
367};
368
369/*
370 * Structure and function definitions for managing Fibre Channel Exchanges
371 * and Sequences
372 *
373 * fc_exch holds state for one exchange and links to its active sequence.
374 *
375 * fc_seq holds the state for an individual sequence.
376 */
377
378struct fc_exch_mgr;
379struct fc_exch_mgr_anchor;
380extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
381
382/**
383 * struct fc_seq - FC sequence
384 * @id: The sequence ID
385 * @ssb_stat: Status flags for the sequence status block (SSB)
386 * @cnt: Number of frames sent so far
387 * @rec_data: FC-4 value for REC
388 */
389struct fc_seq {
390 u8 id;
391 u16 ssb_stat;
392 u16 cnt;
393 u32 rec_data;
394};
395
396#define FC_EX_DONE (1 << 0) /* ep is completed */
397#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
398#define FC_EX_QUARANTINE (1 << 2) /* exch is quarantined */
399
400/**
401 * struct fc_exch - Fibre Channel Exchange
402 * @em: Exchange manager
403 * @pool: Exchange pool
404 * @state: The exchange's state
405 * @xid: The exchange ID
406 * @ex_list: Handle used by the EM to track free exchanges
407 * @ex_lock: Lock that protects the exchange
408 * @ex_refcnt: Reference count
409 * @timeout_work: Handle for timeout handler
410 * @lp: The local port that this exchange is on
411 * @oxid: Originator's exchange ID
412 * @rxid: Responder's exchange ID
413 * @oid: Originator's FCID
414 * @sid: Source FCID
415 * @did: Destination FCID
416 * @esb_stat: ESB exchange status
417 * @r_a_tov: Resource allocation time out value (in msecs)
418 * @seq_id: The next sequence ID to use
419 * @encaps: encapsulation information for lower-level driver
420 * @f_ctl: F_CTL flags for the sequence
421 * @fh_type: The frame type
422 * @class: The class of service
423 * @seq: The sequence in use on this exchange
424 * @resp_active: Number of tasks that are concurrently executing @resp().
425 * @resp_task: If @resp_active > 0, either the task executing @resp(), the
426 * task that has been interrupted to execute the soft-IRQ
427 * executing @resp() or NULL if more than one task is executing
428 * @resp concurrently.
429 * @resp_wq: Waitqueue for the tasks waiting on @resp_active.
430 * @resp: Callback for responses on this exchange
431 * @destructor: Called when destroying the exchange
432 * @arg: Passed as a void pointer to the resp() callback
433 *
434 * Locking notes: The ex_lock protects following items:
435 * state, esb_stat, f_ctl, seq.ssb_stat
436 * seq_id
437 * sequence allocation
438 */
439struct fc_exch {
440 spinlock_t ex_lock;
441 atomic_t ex_refcnt;
442 enum fc_class class;
443 struct fc_exch_mgr *em;
444 struct fc_exch_pool *pool;
445 struct list_head ex_list;
446 struct fc_lport *lp;
447 u32 esb_stat;
448 u8 state;
449 u8 fh_type;
450 u8 seq_id;
451 u8 encaps;
452 u16 xid;
453 u16 oxid;
454 u16 rxid;
455 u32 oid;
456 u32 sid;
457 u32 did;
458 u32 r_a_tov;
459 u32 f_ctl;
460 struct fc_seq seq;
461 int resp_active;
462 struct task_struct *resp_task;
463 wait_queue_head_t resp_wq;
464 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
465 void *arg;
466 void (*destructor)(struct fc_seq *, void *);
467 struct delayed_work timeout_work;
468} ____cacheline_aligned_in_smp;
469#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
470
471
472struct libfc_function_template {
473 /*
474 * Interface to send a FC frame
475 *
476 * STATUS: REQUIRED
477 */
478 int (*frame_send)(struct fc_lport *, struct fc_frame *);
479
480 /*
481 * Interface to send ELS/CT frames
482 *
483 * STATUS: OPTIONAL
484 */
485 struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
486 struct fc_frame *, unsigned int op,
487 void (*resp)(struct fc_seq *,
488 struct fc_frame *, void *arg),
489 void *arg, u32 timer_msec);
490
491 /*
492 * Sets up the DDP context for a given exchange id on the given
493 * scatterlist if LLD supports DDP for large receive.
494 *
495 * STATUS: OPTIONAL
496 */
497 int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
498 unsigned int);
499 /*
500 * Completes the DDP transfer and returns the length of data DDPed
501 * for the given exchange id.
502 *
503 * STATUS: OPTIONAL
504 */
505 int (*ddp_done)(struct fc_lport *, u16);
506 /*
507 * Sets up the DDP context for a given exchange id on the given
508 * scatterlist if LLD supports DDP for target.
509 *
510 * STATUS: OPTIONAL
511 */
512 int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
513 unsigned int);
514 /*
515 * Allow LLD to fill its own Link Error Status Block
516 *
517 * STATUS: OPTIONAL
518 */
519 void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
520
521 /*
522 * Reset an exchange manager, completing all sequences and exchanges.
523 * If s_id is non-zero, reset only exchanges originating from that FID.
524 * If d_id is non-zero, reset only exchanges sending to that FID.
525 *
526 * STATUS: OPTIONAL
527 */
528 void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
529
530 /*
531 * Set the local port FC_ID.
532 *
533 * This may be provided by the LLD to allow it to be
534 * notified when the local port is assigned a FC-ID.
535 *
536 * The frame, if non-NULL, is the incoming frame with the
537 * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
538 * address for the LLD. The frame pointer may be NULL if
539 * no MAC is associated with this assignment (LOGO or PLOGI).
540 *
541 * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
542 *
543 * Note: this is called with the local port mutex held.
544 *
545 * STATUS: OPTIONAL
546 */
547 void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
548 struct fc_frame *);
549
550 /*
551 * Callback routine after the remote port is logged in
552 *
553 * STATUS: OPTIONAL
554 */
555 void (*rport_event_callback)(struct fc_lport *,
556 struct fc_rport_priv *,
557 enum fc_rport_event);
558
559 /*
560 * Send a fcp cmd from fsp pkt.
561 * Called with the SCSI host lock unlocked and irqs disabled.
562 *
563 * The resp handler is called when FCP_RSP received.
564 *
565 * STATUS: OPTIONAL
566 */
567 int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
568 void (*resp)(struct fc_seq *, struct fc_frame *,
569 void *));
570
571 /*
572 * Cleanup the FCP layer, used during link down and reset
573 *
574 * STATUS: OPTIONAL
575 */
576 void (*fcp_cleanup)(struct fc_lport *);
577
578 /*
579 * Abort all I/O on a local port
580 *
581 * STATUS: OPTIONAL
582 */
583 void (*fcp_abort_io)(struct fc_lport *);
584
585 /*
586 * Receive a request for the discovery layer.
587 *
588 * STATUS: OPTIONAL
589 */
590 void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
591
592 /*
593 * Start discovery for a local port.
594 *
595 * STATUS: OPTIONAL
596 */
597 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
598 enum fc_disc_event),
599 struct fc_lport *);
600
601 /*
602 * Stop discovery for a given lport. This will remove
603 * all discovered rports
604 *
605 * STATUS: OPTIONAL
606 */
607 void (*disc_stop) (struct fc_lport *);
608
609 /*
610 * Stop discovery for a given lport. This will block
611 * until all discovered rports are deleted from the
612 * FC transport class
613 *
614 * STATUS: OPTIONAL
615 */
616 void (*disc_stop_final) (struct fc_lport *);
617};
618
619/**
620 * struct fc_disc - Discovery context
621 * @retry_count: Number of retries
622 * @pending: 1 if discovery is pending, 0 if not
623 * @requested: 1 if discovery has been requested, 0 if not
624 * @seq_count: Number of sequences used for discovery
625 * @buf_len: Length of the discovery buffer
626 * @disc_id: Discovery ID
627 * @rports: List of discovered remote ports
628 * @priv: Private pointer for use by discovery code
629 * @disc_mutex: Mutex that protects the discovery context
630 * @partial_buf: Partial name buffer (if names are returned
631 * in multiple frames)
632 * @disc_work: handle for delayed work context
633 * @disc_callback: Callback routine called when discovery completes
634 */
635struct fc_disc {
636 unsigned char retry_count;
637 unsigned char pending;
638 unsigned char requested;
639 unsigned short seq_count;
640 unsigned char buf_len;
641 u16 disc_id;
642
643 struct list_head rports;
644 void *priv;
645 struct mutex disc_mutex;
646 struct fc_gpn_ft_resp partial_buf;
647 struct delayed_work disc_work;
648
649 void (*disc_callback)(struct fc_lport *,
650 enum fc_disc_event);
651};
652
653/*
654 * Local port notifier and events.
655 */
656extern struct blocking_notifier_head fc_lport_notifier_head;
657enum fc_lport_event {
658 FC_LPORT_EV_ADD,
659 FC_LPORT_EV_DEL,
660};
661
662/**
663 * struct fc_lport - Local port
664 * @host: The SCSI host associated with a local port
665 * @ema_list: Exchange manager anchor list
666 * @dns_rdata: The directory server remote port
667 * @ms_rdata: The management server remote port
668 * @ptp_rdata: Point to point remote port
669 * @scsi_priv: FCP layer internal data
670 * @disc: Discovery context
671 * @vports: Child vports if N_Port
672 * @vport: Parent vport if VN_Port
673 * @tt: Libfc function template
674 * @link_up: Link state (1 = link up, 0 = link down)
675 * @qfull: Queue state (1 queue is full, 0 queue is not full)
676 * @state: Identifies the state
677 * @boot_time: Timestamp indicating when the local port came online
678 * @host_stats: SCSI host statistics
679 * @stats: FC local port stats (TODO separate libfc LLD stats)
680 * @retry_count: Number of retries in the current state
681 * @port_id: FC Port ID
682 * @wwpn: World Wide Port Name
683 * @wwnn: World Wide Node Name
684 * @service_params: Common service parameters
685 * @e_d_tov: Error detection timeout value
686 * @r_a_tov: Resource allocation timeout value
687 * @rnid_gen: RNID information
688 * @sg_supp: Indicates if scatter gather is supported
689 * @seq_offload: Indicates if sequence offload is supported
690 * @crc_offload: Indicates if CRC offload is supported
691 * @lro_enabled: Indicates if large receive offload is supported
692 * @does_npiv: Supports multiple vports
693 * @npiv_enabled: Switch/fabric allows NPIV
694 * @mfs: The maximum Fibre Channel payload size
695 * @max_retry_count: The maximum retry attempts
696 * @max_rport_retry_count: The maximum remote port retry attempts
697 * @rport_priv_size: Size needed by driver after struct fc_rport_priv
698 * @lro_xid: The maximum XID for LRO
699 * @lso_max: The maximum large offload send size
700 * @fcts: FC-4 type mask
701 * @lp_mutex: Mutex to protect the local port
702 * @list: Linkage on list of vport peers
703 * @retry_work: Handle to local port for delayed retry context
704 * @prov: Pointers available for use by passive FC-4 providers
705 * @lport_list: Linkage on module-wide list of local ports
706 */
707struct fc_lport {
708 /* Associations */
709 struct Scsi_Host *host;
710 struct list_head ema_list;
711 struct fc_rport_priv *dns_rdata;
712 struct fc_rport_priv *ms_rdata;
713 struct fc_rport_priv *ptp_rdata;
714 void *scsi_priv;
715 struct fc_disc disc;
716
717 /* Virtual port information */
718 struct list_head vports;
719 struct fc_vport *vport;
720
721 /* Operational Information */
722 struct libfc_function_template tt;
723 u8 link_up;
724 u8 qfull;
725 u16 vlan;
726 enum fc_lport_state state;
727 unsigned long boot_time;
728 struct fc_host_statistics host_stats;
729 struct fc_stats __percpu *stats;
730 u8 retry_count;
731
732 /* Fabric information */
733 u32 port_id;
734 u64 wwpn;
735 u64 wwnn;
736 unsigned int service_params;
737 unsigned int e_d_tov;
738 unsigned int r_a_tov;
739 struct fc_els_rnid_gen rnid_gen;
740
741 /* Capabilities */
742 u32 sg_supp:1;
743 u32 seq_offload:1;
744 u32 crc_offload:1;
745 u32 lro_enabled:1;
746 u32 does_npiv:1;
747 u32 npiv_enabled:1;
748 u32 point_to_multipoint:1;
749 u32 fdmi_enabled:1;
750 u32 mfs;
751 u8 max_retry_count;
752 u8 max_rport_retry_count;
753 u16 rport_priv_size;
754 u16 link_speed;
755 u16 link_supported_speeds;
756 u16 lro_xid;
757 unsigned int lso_max;
758 struct fc_ns_fts fcts;
759
760 /* Miscellaneous */
761 struct mutex lp_mutex;
762 struct list_head list;
763 struct delayed_work retry_work;
764 void *prov[FC_FC4_PROV_SIZE];
765 struct list_head lport_list;
766};
767
768/**
769 * struct fc4_prov - FC-4 provider registration
770 * @prli: Handler for incoming PRLI
771 * @prlo: Handler for session reset
772 * @recv: Handler for incoming request
773 * @module: Pointer to module. May be NULL.
774 */
775struct fc4_prov {
776 int (*prli)(struct fc_rport_priv *, u32 spp_len,
777 const struct fc_els_spp *spp_in,
778 struct fc_els_spp *spp_out);
779 void (*prlo)(struct fc_rport_priv *);
780 void (*recv)(struct fc_lport *, struct fc_frame *);
781 struct module *module;
782};
783
784/*
785 * Register FC-4 provider with libfc.
786 */
787int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
788void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
789
790/*
791 * FC_LPORT HELPER FUNCTIONS
792 *****************************/
793
794/**
795 * fc_lport_test_ready() - Determine if a local port is in the READY state
796 * @lport: The local port to test
797 *
798 * Returns: %true if local port is in the READY state, %false otherwise
799 */
800static inline int fc_lport_test_ready(struct fc_lport *lport)
801{
802 return lport->state == LPORT_ST_READY;
803}
804
805/**
806 * fc_set_wwnn() - Set the World Wide Node Name of a local port
807 * @lport: The local port whose WWNN is to be set
808 * @wwnn: The new WWNN
809 */
810static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
811{
812 lport->wwnn = wwnn;
813}
814
815/**
816 * fc_set_wwpn() - Set the World Wide Port Name of a local port
817 * @lport: The local port whose WWPN is to be set
818 * @wwpn: The new WWPN
819 */
820static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwpn)
821{
822 lport->wwpn = wwpn;
823}
824
825/**
826 * fc_lport_state_enter() - Change a local port's state
827 * @lport: The local port whose state is to change
828 * @state: The new state
829 */
830static inline void fc_lport_state_enter(struct fc_lport *lport,
831 enum fc_lport_state state)
832{
833 if (state != lport->state)
834 lport->retry_count = 0;
835 lport->state = state;
836}
837
838/**
839 * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
840 * @lport: The local port whose statistics are to be initialized
841 *
842 * Returns: %0 on success, %-ENOMEM on failure
843 */
844static inline int fc_lport_init_stats(struct fc_lport *lport)
845{
846 lport->stats = alloc_percpu(struct fc_stats);
847 if (!lport->stats)
848 return -ENOMEM;
849 return 0;
850}
851
852/**
853 * fc_lport_free_stats() - Free memory for a local port's statistics
854 * @lport: The local port whose statistics are to be freed
855 */
856static inline void fc_lport_free_stats(struct fc_lport *lport)
857{
858 free_percpu(lport->stats);
859}
860
861/**
862 * lport_priv() - Return the private data from a local port
863 * @lport: The local port whose private data is to be retrieved
864 *
865 * Returns: the local port's private data pointer
866 */
867static inline void *lport_priv(const struct fc_lport *lport)
868{
869 return (void *)(lport + 1);
870}
871
872/**
873 * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
874 * LLD private data
875 * @sht: The SCSI host template
876 * @priv_size: Size of private data
877 *
878 * Returns: libfc lport
879 */
880static inline struct fc_lport *
881libfc_host_alloc(const struct scsi_host_template *sht, int priv_size)
882{
883 struct fc_lport *lport;
884 struct Scsi_Host *shost;
885
886 shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
887 if (!shost)
888 return NULL;
889 lport = shost_priv(shost);
890 lport->host = shost;
891 INIT_LIST_HEAD(&lport->ema_list);
892 INIT_LIST_HEAD(&lport->vports);
893 return lport;
894}
895
896/*
897 * FC_FCP HELPER FUNCTIONS
898 *****************************/
899static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
900{
901 if (fsp && fsp->cmd)
902 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
903 return false;
904}
905
906/*
907 * LOCAL PORT LAYER
908 *****************************/
909int fc_lport_init(struct fc_lport *);
910int fc_lport_destroy(struct fc_lport *);
911int fc_fabric_logoff(struct fc_lport *);
912int fc_fabric_login(struct fc_lport *);
913void __fc_linkup(struct fc_lport *);
914void fc_linkup(struct fc_lport *);
915void __fc_linkdown(struct fc_lport *);
916void fc_linkdown(struct fc_lport *);
917void fc_vport_setlink(struct fc_lport *);
918void fc_vports_linkchange(struct fc_lport *);
919int fc_lport_config(struct fc_lport *);
920int fc_lport_reset(struct fc_lport *);
921void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp);
922int fc_set_mfs(struct fc_lport *, u32 mfs);
923struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
924struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
925int fc_lport_bsg_request(struct bsg_job *);
926void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
927void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
928
929/*
930 * REMOTE PORT LAYER
931 *****************************/
932void fc_rport_terminate_io(struct fc_rport *);
933struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
934 u32 port_id);
935struct fc_rport_priv *fc_rport_create(struct fc_lport *, u32);
936void fc_rport_destroy(struct kref *kref);
937int fc_rport_login(struct fc_rport_priv *rdata);
938int fc_rport_logoff(struct fc_rport_priv *rdata);
939void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp);
940void fc_rport_flush_queue(void);
941
942/*
943 * DISCOVERY LAYER
944 *****************************/
945void fc_disc_init(struct fc_lport *);
946void fc_disc_config(struct fc_lport *, void *);
947
948static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
949{
950 return container_of(disc, struct fc_lport, disc);
951}
952
953/*
954 * FCP LAYER
955 *****************************/
956int fc_fcp_init(struct fc_lport *);
957void fc_fcp_destroy(struct fc_lport *);
958
959/*
960 * SCSI INTERACTION LAYER
961 *****************************/
962enum scsi_qc_status fc_queuecommand(struct Scsi_Host *shost,
963 struct scsi_cmnd *cmnd);
964int fc_eh_abort(struct scsi_cmnd *);
965int fc_eh_device_reset(struct scsi_cmnd *);
966int fc_eh_host_reset(struct scsi_cmnd *);
967int fc_sdev_init(struct scsi_device *);
968
969/*
970 * ELS/CT interface
971 *****************************/
972int fc_elsct_init(struct fc_lport *);
973struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
974 struct fc_frame *,
975 unsigned int op,
976 void (*resp)(struct fc_seq *,
977 struct fc_frame *,
978 void *arg),
979 void *arg, u32 timer_msec);
980void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
981void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
982void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
983 enum fc_rctl, u32 parm_offset);
984void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
985 enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
986
987
988/*
989 * EXCHANGE MANAGER LAYER
990 *****************************/
991int fc_exch_init(struct fc_lport *);
992void fc_exch_update_stats(struct fc_lport *lport);
993struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
994 struct fc_frame *fp,
995 void (*resp)(struct fc_seq *,
996 struct fc_frame *fp,
997 void *arg),
998 void (*destructor)(struct fc_seq *, void *),
999 void *arg, u32 timer_msec);
1000void fc_seq_els_rsp_send(struct fc_frame *, enum fc_els_cmd,
1001 struct fc_seq_els_data *);
1002struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
1003void fc_seq_set_resp(struct fc_seq *sp,
1004 void (*resp)(struct fc_seq *, struct fc_frame *, void *),
1005 void *arg);
1006struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp);
1007void fc_seq_release(struct fc_seq *sp);
1008struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1009 struct fc_exch_mgr *,
1010 bool (*match)(struct fc_frame *));
1011void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1012int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1013struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1014 u16 min_xid, u16 max_xid,
1015 bool (*match)(struct fc_frame *));
1016void fc_exch_mgr_free(struct fc_lport *);
1017void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1018void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1019int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp);
1020int fc_seq_exch_abort(const struct fc_seq *, unsigned int timer_msec);
1021void fc_exch_done(struct fc_seq *sp);
1022
1023/*
1024 * Functions for fc_functions_template
1025 */
1026void fc_get_host_speed(struct Scsi_Host *);
1027void fc_get_host_port_state(struct Scsi_Host *);
1028void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1029struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1030
1031#endif /* _LIBFC_H_ */