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42e9a92f RL |
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> | |
582b45bc | 25 | #include <linux/percpu.h> |
42e9a92f RL |
26 | |
27 | #include <scsi/scsi_transport.h> | |
28 | #include <scsi/scsi_transport_fc.h> | |
29 | ||
30 | #include <scsi/fc/fc_fcp.h> | |
31 | #include <scsi/fc/fc_ns.h> | |
32 | #include <scsi/fc/fc_els.h> | |
33 | #include <scsi/fc/fc_gs.h> | |
34 | ||
35 | #include <scsi/fc_frame.h> | |
36 | ||
37 | #define LIBFC_DEBUG | |
38 | ||
39 | #ifdef LIBFC_DEBUG | |
40 | /* Log messages */ | |
41 | #define FC_DBG(fmt, args...) \ | |
42 | do { \ | |
43 | printk(KERN_INFO "%s " fmt, __func__, ##args); \ | |
44 | } while (0) | |
45 | #else | |
46 | #define FC_DBG(fmt, args...) | |
47 | #endif | |
48 | ||
49 | /* | |
50 | * libfc error codes | |
51 | */ | |
52 | #define FC_NO_ERR 0 /* no error */ | |
53 | #define FC_EX_TIMEOUT 1 /* Exchange timeout */ | |
54 | #define FC_EX_CLOSED 2 /* Exchange closed */ | |
55 | ||
56 | /* some helpful macros */ | |
57 | ||
58 | #define ntohll(x) be64_to_cpu(x) | |
59 | #define htonll(x) cpu_to_be64(x) | |
60 | ||
61 | #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2])) | |
62 | ||
63 | #define hton24(p, v) do { \ | |
64 | p[0] = (((v) >> 16) & 0xFF); \ | |
65 | p[1] = (((v) >> 8) & 0xFF); \ | |
66 | p[2] = ((v) & 0xFF); \ | |
67 | } while (0) | |
68 | ||
69 | /* | |
70 | * FC HBA status | |
71 | */ | |
42e9a92f RL |
72 | enum fc_lport_state { |
73 | LPORT_ST_NONE = 0, | |
74 | LPORT_ST_FLOGI, | |
75 | LPORT_ST_DNS, | |
76 | LPORT_ST_RPN_ID, | |
77 | LPORT_ST_RFT_ID, | |
78 | LPORT_ST_SCR, | |
79 | LPORT_ST_READY, | |
80 | LPORT_ST_LOGO, | |
81 | LPORT_ST_RESET | |
82 | }; | |
83 | ||
84 | enum fc_disc_event { | |
85 | DISC_EV_NONE = 0, | |
86 | DISC_EV_SUCCESS, | |
87 | DISC_EV_FAILED | |
88 | }; | |
89 | ||
90 | enum fc_rport_state { | |
91 | RPORT_ST_NONE = 0, | |
92 | RPORT_ST_INIT, /* initialized */ | |
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_LOGO, /* port logout sent */ | |
98 | }; | |
99 | ||
100 | enum fc_rport_trans_state { | |
101 | FC_PORTSTATE_ROGUE, | |
102 | FC_PORTSTATE_REAL, | |
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 | * @ids: identifiers structure to pass to fc_remote_port_add() | |
110 | * @rport_work: work struct for starting the rport state machine | |
111 | */ | |
112 | struct fc_disc_port { | |
113 | struct fc_lport *lp; | |
114 | struct list_head peers; | |
115 | struct fc_rport_identifiers ids; | |
116 | struct work_struct rport_work; | |
117 | }; | |
118 | ||
119 | enum fc_rport_event { | |
120 | RPORT_EV_NONE = 0, | |
121 | RPORT_EV_CREATED, | |
122 | RPORT_EV_FAILED, | |
123 | RPORT_EV_STOP, | |
124 | RPORT_EV_LOGO | |
125 | }; | |
126 | ||
127 | struct fc_rport_operations { | |
128 | void (*event_callback)(struct fc_lport *, struct fc_rport *, | |
129 | enum fc_rport_event); | |
130 | }; | |
131 | ||
132 | /** | |
133 | * struct fc_rport_libfc_priv - libfc internal information about a remote port | |
134 | * @local_port: Fibre Channel host port instance | |
135 | * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges | |
136 | * @flags: REC and RETRY supported flags | |
137 | * @max_seq: maximum number of concurrent sequences | |
138 | * @retries: retry count in current state | |
139 | * @e_d_tov: error detect timeout value (in msec) | |
140 | * @r_a_tov: resource allocation timeout value (in msec) | |
141 | * @rp_mutex: mutex protects rport | |
142 | * @retry_work: | |
143 | * @event_callback: Callback for rport READY, FAILED or LOGO | |
144 | */ | |
145 | struct fc_rport_libfc_priv { | |
146 | struct fc_lport *local_port; | |
147 | enum fc_rport_state rp_state; | |
148 | u16 flags; | |
149 | #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0) | |
150 | #define FC_RP_FLAGS_RETRY (1 << 1) | |
151 | u16 max_seq; | |
152 | unsigned int retries; | |
153 | unsigned int e_d_tov; | |
154 | unsigned int r_a_tov; | |
155 | enum fc_rport_trans_state trans_state; | |
156 | struct mutex rp_mutex; | |
157 | struct delayed_work retry_work; | |
158 | enum fc_rport_event event; | |
159 | struct fc_rport_operations *ops; | |
160 | struct list_head peers; | |
161 | struct work_struct event_work; | |
162 | }; | |
163 | ||
164 | #define PRIV_TO_RPORT(x) \ | |
165 | (struct fc_rport *)((void *)x - sizeof(struct fc_rport)); | |
166 | #define RPORT_TO_PRIV(x) \ | |
167 | (struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport)); | |
168 | ||
169 | struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *); | |
170 | ||
171 | static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn) | |
172 | { | |
173 | rport->node_name = wwnn; | |
174 | rport->port_name = wwpn; | |
175 | } | |
176 | ||
177 | /* | |
178 | * fcoe stats structure | |
179 | */ | |
180 | struct fcoe_dev_stats { | |
181 | u64 SecondsSinceLastReset; | |
182 | u64 TxFrames; | |
183 | u64 TxWords; | |
184 | u64 RxFrames; | |
185 | u64 RxWords; | |
186 | u64 ErrorFrames; | |
187 | u64 DumpedFrames; | |
188 | u64 LinkFailureCount; | |
189 | u64 LossOfSignalCount; | |
190 | u64 InvalidTxWordCount; | |
191 | u64 InvalidCRCCount; | |
192 | u64 InputRequests; | |
193 | u64 OutputRequests; | |
194 | u64 ControlRequests; | |
195 | u64 InputMegabytes; | |
196 | u64 OutputMegabytes; | |
197 | }; | |
198 | ||
199 | /* | |
200 | * els data is used for passing ELS respone specific | |
201 | * data to send ELS response mainly using infomation | |
202 | * in exchange and sequence in EM layer. | |
203 | */ | |
204 | struct fc_seq_els_data { | |
205 | struct fc_frame *fp; | |
206 | enum fc_els_rjt_reason reason; | |
207 | enum fc_els_rjt_explan explan; | |
208 | }; | |
209 | ||
210 | /* | |
211 | * FCP request structure, one for each scsi cmd request | |
212 | */ | |
213 | struct fc_fcp_pkt { | |
214 | /* | |
215 | * housekeeping stuff | |
216 | */ | |
217 | struct fc_lport *lp; /* handle to hba struct */ | |
218 | u16 state; /* scsi_pkt state state */ | |
219 | u16 tgt_flags; /* target flags */ | |
220 | atomic_t ref_cnt; /* fcp pkt ref count */ | |
221 | spinlock_t scsi_pkt_lock; /* Must be taken before the host lock | |
222 | * if both are held at the same time */ | |
223 | /* | |
224 | * SCSI I/O related stuff | |
225 | */ | |
226 | struct scsi_cmnd *cmd; /* scsi command pointer. set/clear | |
227 | * under host lock */ | |
228 | struct list_head list; /* tracks queued commands. access under | |
229 | * host lock */ | |
230 | /* | |
231 | * timeout related stuff | |
232 | */ | |
233 | struct timer_list timer; /* command timer */ | |
234 | struct completion tm_done; | |
235 | int wait_for_comp; | |
236 | unsigned long start_time; /* start jiffie */ | |
237 | unsigned long end_time; /* end jiffie */ | |
238 | unsigned long last_pkt_time; /* jiffies of last frame received */ | |
239 | ||
240 | /* | |
241 | * scsi cmd and data transfer information | |
242 | */ | |
243 | u32 data_len; | |
244 | /* | |
245 | * transport related veriables | |
246 | */ | |
247 | struct fcp_cmnd cdb_cmd; | |
248 | size_t xfer_len; | |
b277d2aa | 249 | u16 xfer_ddp; /* this xfer is ddped */ |
42e9a92f RL |
250 | u32 xfer_contig_end; /* offset of end of contiguous xfer */ |
251 | u16 max_payload; /* max payload size in bytes */ | |
252 | ||
253 | /* | |
254 | * scsi/fcp return status | |
255 | */ | |
256 | u32 io_status; /* SCSI result upper 24 bits */ | |
257 | u8 cdb_status; | |
258 | u8 status_code; /* FCP I/O status */ | |
259 | /* bit 3 Underrun bit 2: overrun */ | |
260 | u8 scsi_comp_flags; | |
261 | u32 req_flags; /* bit 0: read bit:1 write */ | |
262 | u32 scsi_resid; /* residule length */ | |
263 | ||
264 | struct fc_rport *rport; /* remote port pointer */ | |
265 | struct fc_seq *seq_ptr; /* current sequence pointer */ | |
266 | /* | |
267 | * Error Processing | |
268 | */ | |
269 | u8 recov_retry; /* count of recovery retries */ | |
270 | struct fc_seq *recov_seq; /* sequence for REC or SRR */ | |
271 | }; | |
b277d2aa YZ |
272 | /* |
273 | * FC_FCP HELPER FUNCTIONS | |
274 | *****************************/ | |
275 | static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp) | |
276 | { | |
277 | if (fsp && fsp->cmd) | |
278 | return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE; | |
279 | return false; | |
280 | } | |
42e9a92f RL |
281 | |
282 | /* | |
283 | * Structure and function definitions for managing Fibre Channel Exchanges | |
284 | * and Sequences | |
285 | * | |
286 | * fc_exch holds state for one exchange and links to its active sequence. | |
287 | * | |
288 | * fc_seq holds the state for an individual sequence. | |
289 | */ | |
290 | ||
291 | struct fc_exch_mgr; | |
292 | ||
293 | /* | |
294 | * Sequence. | |
295 | */ | |
296 | struct fc_seq { | |
297 | u8 id; /* seq ID */ | |
298 | u16 ssb_stat; /* status flags for sequence status block */ | |
299 | u16 cnt; /* frames sent so far on sequence */ | |
300 | u32 rec_data; /* FC-4 value for REC */ | |
301 | }; | |
302 | ||
303 | #define FC_EX_DONE (1 << 0) /* ep is completed */ | |
304 | #define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */ | |
305 | ||
306 | /* | |
307 | * Exchange. | |
308 | * | |
309 | * Locking notes: The ex_lock protects following items: | |
310 | * state, esb_stat, f_ctl, seq.ssb_stat | |
311 | * seq_id | |
312 | * sequence allocation | |
313 | */ | |
314 | struct fc_exch { | |
315 | struct fc_exch_mgr *em; /* exchange manager */ | |
316 | u32 state; /* internal driver state */ | |
317 | u16 xid; /* our exchange ID */ | |
318 | struct list_head ex_list; /* free or busy list linkage */ | |
319 | spinlock_t ex_lock; /* lock covering exchange state */ | |
320 | atomic_t ex_refcnt; /* reference counter */ | |
321 | struct delayed_work timeout_work; /* timer for upper level protocols */ | |
322 | struct fc_lport *lp; /* fc device instance */ | |
323 | u16 oxid; /* originator's exchange ID */ | |
324 | u16 rxid; /* responder's exchange ID */ | |
325 | u32 oid; /* originator's FCID */ | |
326 | u32 sid; /* source FCID */ | |
327 | u32 did; /* destination FCID */ | |
328 | u32 esb_stat; /* exchange status for ESB */ | |
329 | u32 r_a_tov; /* r_a_tov from rport (msec) */ | |
330 | u8 seq_id; /* next sequence ID to use */ | |
331 | u32 f_ctl; /* F_CTL flags for sequences */ | |
332 | u8 fh_type; /* frame type */ | |
333 | enum fc_class class; /* class of service */ | |
334 | struct fc_seq seq; /* single sequence */ | |
335 | /* | |
336 | * Handler for responses to this current exchange. | |
337 | */ | |
338 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
339 | void (*destructor)(struct fc_seq *, void *); | |
340 | /* | |
341 | * arg is passed as void pointer to exchange | |
342 | * resp and destructor handlers | |
343 | */ | |
344 | void *arg; | |
345 | }; | |
346 | #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) | |
347 | ||
348 | struct libfc_function_template { | |
349 | ||
42e9a92f RL |
350 | /* |
351 | * Interface to send a FC frame | |
42e9a92f | 352 | * |
0ae4d4ae | 353 | * STATUS: REQUIRED |
42e9a92f | 354 | */ |
0ae4d4ae | 355 | int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp); |
42e9a92f RL |
356 | |
357 | /* | |
0ae4d4ae RL |
358 | * Interface to send ELS/CT frames |
359 | * | |
360 | * STATUS: OPTIONAL | |
42e9a92f RL |
361 | */ |
362 | struct fc_seq *(*elsct_send)(struct fc_lport *lport, | |
363 | struct fc_rport *rport, | |
364 | struct fc_frame *fp, | |
365 | unsigned int op, | |
366 | void (*resp)(struct fc_seq *, | |
367 | struct fc_frame *fp, | |
368 | void *arg), | |
369 | void *arg, u32 timer_msec); | |
42e9a92f RL |
370 | |
371 | /* | |
372 | * Send the FC frame payload using a new exchange and sequence. | |
373 | * | |
374 | * The frame pointer with some of the header's fields must be | |
375 | * filled before calling exch_seq_send(), those fields are, | |
376 | * | |
377 | * - routing control | |
378 | * - FC port did | |
379 | * - FC port sid | |
380 | * - FC header type | |
381 | * - frame control | |
382 | * - parameter or relative offset | |
383 | * | |
384 | * The exchange response handler is set in this routine to resp() | |
385 | * function pointer. It can be called in two scenarios: if a timeout | |
386 | * occurs or if a response frame is received for the exchange. The | |
387 | * fc_frame pointer in response handler will also indicate timeout | |
388 | * as error using IS_ERR related macros. | |
389 | * | |
390 | * The exchange destructor handler is also set in this routine. | |
391 | * The destructor handler is invoked by EM layer when exchange | |
392 | * is about to free, this can be used by caller to free its | |
393 | * resources along with exchange free. | |
394 | * | |
395 | * The arg is passed back to resp and destructor handler. | |
396 | * | |
397 | * The timeout value (in msec) for an exchange is set if non zero | |
398 | * timer_msec argument is specified. The timer is canceled when | |
399 | * it fires or when the exchange is done. The exchange timeout handler | |
400 | * is registered by EM layer. | |
0ae4d4ae RL |
401 | * |
402 | * STATUS: OPTIONAL | |
42e9a92f RL |
403 | */ |
404 | struct fc_seq *(*exch_seq_send)(struct fc_lport *lp, | |
405 | struct fc_frame *fp, | |
406 | void (*resp)(struct fc_seq *sp, | |
407 | struct fc_frame *fp, | |
408 | void *arg), | |
409 | void (*destructor)(struct fc_seq *sp, | |
410 | void *arg), | |
411 | void *arg, unsigned int timer_msec); | |
412 | ||
b277d2aa YZ |
413 | /* |
414 | * Sets up the DDP context for a given exchange id on the given | |
415 | * scatterlist if LLD supports DDP for large receive. | |
416 | * | |
417 | * STATUS: OPTIONAL | |
418 | */ | |
419 | int (*ddp_setup)(struct fc_lport *lp, u16 xid, | |
420 | struct scatterlist *sgl, unsigned int sgc); | |
421 | /* | |
422 | * Completes the DDP transfer and returns the length of data DDPed | |
423 | * for the given exchange id. | |
424 | * | |
425 | * STATUS: OPTIONAL | |
426 | */ | |
427 | int (*ddp_done)(struct fc_lport *lp, u16 xid); | |
42e9a92f | 428 | /* |
0ae4d4ae RL |
429 | * Send a frame using an existing sequence and exchange. |
430 | * | |
431 | * STATUS: OPTIONAL | |
42e9a92f RL |
432 | */ |
433 | int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp, | |
434 | struct fc_frame *fp); | |
435 | ||
436 | /* | |
0ae4d4ae RL |
437 | * Send an ELS response using infomation from a previous |
438 | * exchange and sequence. | |
439 | * | |
440 | * STATUS: OPTIONAL | |
42e9a92f RL |
441 | */ |
442 | void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd, | |
443 | struct fc_seq_els_data *els_data); | |
444 | ||
445 | /* | |
446 | * Abort an exchange and sequence. Generally called because of a | |
447 | * exchange timeout or an abort from the upper layer. | |
448 | * | |
449 | * A timer_msec can be specified for abort timeout, if non-zero | |
450 | * timer_msec value is specified then exchange resp handler | |
451 | * will be called with timeout error if no response to abort. | |
0ae4d4ae RL |
452 | * |
453 | * STATUS: OPTIONAL | |
42e9a92f RL |
454 | */ |
455 | int (*seq_exch_abort)(const struct fc_seq *req_sp, | |
456 | unsigned int timer_msec); | |
457 | ||
458 | /* | |
459 | * Indicate that an exchange/sequence tuple is complete and the memory | |
460 | * allocated for the related objects may be freed. | |
0ae4d4ae RL |
461 | * |
462 | * STATUS: OPTIONAL | |
42e9a92f RL |
463 | */ |
464 | void (*exch_done)(struct fc_seq *sp); | |
465 | ||
466 | /* | |
467 | * Assigns a EM and a free XID for an new exchange and then | |
468 | * allocates a new exchange and sequence pair. | |
469 | * The fp can be used to determine free XID. | |
0ae4d4ae RL |
470 | * |
471 | * STATUS: OPTIONAL | |
42e9a92f RL |
472 | */ |
473 | struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp); | |
474 | ||
475 | /* | |
476 | * Release previously assigned XID by exch_get API. | |
477 | * The LLD may implement this if XID is assigned by LLD | |
478 | * in exch_get(). | |
0ae4d4ae RL |
479 | * |
480 | * STATUS: OPTIONAL | |
42e9a92f RL |
481 | */ |
482 | void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp, | |
483 | u16 ex_id); | |
484 | ||
485 | /* | |
486 | * Start a new sequence on the same exchange/sequence tuple. | |
0ae4d4ae RL |
487 | * |
488 | * STATUS: OPTIONAL | |
42e9a92f RL |
489 | */ |
490 | struct fc_seq *(*seq_start_next)(struct fc_seq *sp); | |
491 | ||
492 | /* | |
493 | * Reset an exchange manager, completing all sequences and exchanges. | |
494 | * If s_id is non-zero, reset only exchanges originating from that FID. | |
495 | * If d_id is non-zero, reset only exchanges sending to that FID. | |
0ae4d4ae RL |
496 | * |
497 | * STATUS: OPTIONAL | |
42e9a92f | 498 | */ |
1f6ff364 | 499 | void (*exch_mgr_reset)(struct fc_lport *, |
42e9a92f RL |
500 | u32 s_id, u32 d_id); |
501 | ||
0ae4d4ae RL |
502 | /* |
503 | * Flush the rport work queue. Generally used before shutdown. | |
504 | * | |
505 | * STATUS: OPTIONAL | |
42e9a92f | 506 | */ |
0ae4d4ae | 507 | void (*rport_flush_queue)(void); |
42e9a92f RL |
508 | |
509 | /* | |
0ae4d4ae RL |
510 | * Receive a frame for a local port. |
511 | * | |
512 | * STATUS: OPTIONAL | |
42e9a92f RL |
513 | */ |
514 | void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp, | |
515 | struct fc_frame *fp); | |
516 | ||
0ae4d4ae RL |
517 | /* |
518 | * Reset the local port. | |
519 | * | |
520 | * STATUS: OPTIONAL | |
42e9a92f | 521 | */ |
0ae4d4ae | 522 | int (*lport_reset)(struct fc_lport *); |
42e9a92f | 523 | |
5101ff99 RL |
524 | /* |
525 | * Create a remote port | |
526 | */ | |
527 | struct fc_rport *(*rport_create)(struct fc_disc_port *); | |
528 | ||
42e9a92f RL |
529 | /* |
530 | * Initiates the RP state machine. It is called from the LP module. | |
531 | * This function will issue the following commands to the N_Port | |
532 | * identified by the FC ID provided. | |
533 | * | |
534 | * - PLOGI | |
535 | * - PRLI | |
536 | * - RTV | |
0ae4d4ae RL |
537 | * |
538 | * STATUS: OPTIONAL | |
42e9a92f RL |
539 | */ |
540 | int (*rport_login)(struct fc_rport *rport); | |
541 | ||
542 | /* | |
543 | * Logoff, and remove the rport from the transport if | |
544 | * it had been added. This will send a LOGO to the target. | |
0ae4d4ae RL |
545 | * |
546 | * STATUS: OPTIONAL | |
42e9a92f RL |
547 | */ |
548 | int (*rport_logoff)(struct fc_rport *rport); | |
549 | ||
550 | /* | |
551 | * Recieve a request from a remote port. | |
0ae4d4ae RL |
552 | * |
553 | * STATUS: OPTIONAL | |
42e9a92f RL |
554 | */ |
555 | void (*rport_recv_req)(struct fc_seq *, struct fc_frame *, | |
556 | struct fc_rport *); | |
557 | ||
0ae4d4ae RL |
558 | /* |
559 | * lookup an rport by it's port ID. | |
560 | * | |
561 | * STATUS: OPTIONAL | |
42e9a92f | 562 | */ |
0ae4d4ae | 563 | struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32); |
42e9a92f RL |
564 | |
565 | /* | |
566 | * Send a fcp cmd from fsp pkt. | |
567 | * Called with the SCSI host lock unlocked and irqs disabled. | |
568 | * | |
569 | * The resp handler is called when FCP_RSP received. | |
570 | * | |
0ae4d4ae | 571 | * STATUS: OPTIONAL |
42e9a92f RL |
572 | */ |
573 | int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp, | |
574 | void (*resp)(struct fc_seq *, struct fc_frame *fp, | |
575 | void *arg)); | |
576 | ||
577 | /* | |
0ae4d4ae RL |
578 | * Cleanup the FCP layer, used durring link down and reset |
579 | * | |
580 | * STATUS: OPTIONAL | |
42e9a92f RL |
581 | */ |
582 | void (*fcp_cleanup)(struct fc_lport *lp); | |
583 | ||
584 | /* | |
585 | * Abort all I/O on a local port | |
0ae4d4ae RL |
586 | * |
587 | * STATUS: OPTIONAL | |
42e9a92f RL |
588 | */ |
589 | void (*fcp_abort_io)(struct fc_lport *lp); | |
590 | ||
0ae4d4ae RL |
591 | /* |
592 | * Receive a request for the discovery layer. | |
593 | * | |
594 | * STATUS: OPTIONAL | |
42e9a92f | 595 | */ |
42e9a92f RL |
596 | void (*disc_recv_req)(struct fc_seq *, |
597 | struct fc_frame *, struct fc_lport *); | |
598 | ||
599 | /* | |
600 | * Start discovery for a local port. | |
0ae4d4ae RL |
601 | * |
602 | * STATUS: OPTIONAL | |
42e9a92f RL |
603 | */ |
604 | void (*disc_start)(void (*disc_callback)(struct fc_lport *, | |
605 | enum fc_disc_event), | |
606 | struct fc_lport *); | |
607 | ||
608 | /* | |
609 | * Stop discovery for a given lport. This will remove | |
610 | * all discovered rports | |
0ae4d4ae RL |
611 | * |
612 | * STATUS: OPTIONAL | |
42e9a92f RL |
613 | */ |
614 | void (*disc_stop) (struct fc_lport *); | |
615 | ||
616 | /* | |
617 | * Stop discovery for a given lport. This will block | |
618 | * until all discovered rports are deleted from the | |
619 | * FC transport class | |
0ae4d4ae RL |
620 | * |
621 | * STATUS: OPTIONAL | |
42e9a92f RL |
622 | */ |
623 | void (*disc_stop_final) (struct fc_lport *); | |
624 | }; | |
625 | ||
626 | /* information used by the discovery layer */ | |
627 | struct fc_disc { | |
628 | unsigned char retry_count; | |
629 | unsigned char delay; | |
630 | unsigned char pending; | |
631 | unsigned char requested; | |
632 | unsigned short seq_count; | |
633 | unsigned char buf_len; | |
634 | enum fc_disc_event event; | |
635 | ||
636 | void (*disc_callback)(struct fc_lport *, | |
637 | enum fc_disc_event); | |
638 | ||
639 | struct list_head rports; | |
b4c6f546 | 640 | struct list_head rogue_rports; |
42e9a92f RL |
641 | struct fc_lport *lport; |
642 | struct mutex disc_mutex; | |
643 | struct fc_gpn_ft_resp partial_buf; /* partial name buffer */ | |
644 | struct delayed_work disc_work; | |
645 | }; | |
646 | ||
647 | struct fc_lport { | |
648 | struct list_head list; | |
649 | ||
650 | /* Associations */ | |
651 | struct Scsi_Host *host; | |
652 | struct fc_exch_mgr *emp; | |
653 | struct fc_rport *dns_rp; | |
654 | struct fc_rport *ptp_rp; | |
655 | void *scsi_priv; | |
656 | struct fc_disc disc; | |
657 | ||
658 | /* Operational Information */ | |
659 | struct libfc_function_template tt; | |
bc0e17f6 VD |
660 | u8 link_up; |
661 | u8 qfull; | |
42e9a92f RL |
662 | enum fc_lport_state state; |
663 | unsigned long boot_time; | |
664 | ||
665 | struct fc_host_statistics host_stats; | |
582b45bc RL |
666 | struct fcoe_dev_stats *dev_stats; |
667 | ||
42e9a92f RL |
668 | u64 wwpn; |
669 | u64 wwnn; | |
670 | u8 retry_count; | |
671 | ||
672 | /* Capabilities */ | |
673 | u32 sg_supp:1; /* scatter gather supported */ | |
674 | u32 seq_offload:1; /* seq offload supported */ | |
675 | u32 crc_offload:1; /* crc offload supported */ | |
676 | u32 lro_enabled:1; /* large receive offload */ | |
677 | u32 mfs; /* max FC payload size */ | |
678 | unsigned int service_params; | |
679 | unsigned int e_d_tov; | |
680 | unsigned int r_a_tov; | |
681 | u8 max_retry_count; | |
a3666955 | 682 | u8 max_rport_retry_count; |
42e9a92f RL |
683 | u16 link_speed; |
684 | u16 link_supported_speeds; | |
685 | u16 lro_xid; /* max xid for fcoe lro */ | |
ea1e9a9d | 686 | unsigned int lso_max; /* max large send size */ |
42e9a92f RL |
687 | struct fc_ns_fts fcts; /* FC-4 type masks */ |
688 | struct fc_els_rnid_gen rnid_gen; /* RNID information */ | |
689 | ||
690 | /* Semaphores */ | |
691 | struct mutex lp_mutex; | |
692 | ||
693 | /* Miscellaneous */ | |
694 | struct delayed_work retry_work; | |
695 | struct delayed_work disc_work; | |
696 | }; | |
697 | ||
34f42a07 | 698 | /* |
42e9a92f RL |
699 | * FC_LPORT HELPER FUNCTIONS |
700 | *****************************/ | |
42e9a92f RL |
701 | static inline int fc_lport_test_ready(struct fc_lport *lp) |
702 | { | |
703 | return lp->state == LPORT_ST_READY; | |
704 | } | |
705 | ||
706 | static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn) | |
707 | { | |
708 | lp->wwnn = wwnn; | |
709 | } | |
710 | ||
711 | static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn) | |
712 | { | |
713 | lp->wwpn = wwnn; | |
714 | } | |
715 | ||
716 | static inline void fc_lport_state_enter(struct fc_lport *lp, | |
717 | enum fc_lport_state state) | |
718 | { | |
719 | if (state != lp->state) | |
720 | lp->retry_count = 0; | |
721 | lp->state = state; | |
722 | } | |
723 | ||
582b45bc RL |
724 | static inline int fc_lport_init_stats(struct fc_lport *lp) |
725 | { | |
726 | /* allocate per cpu stats block */ | |
727 | lp->dev_stats = alloc_percpu(struct fcoe_dev_stats); | |
728 | if (!lp->dev_stats) | |
729 | return -ENOMEM; | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static inline void fc_lport_free_stats(struct fc_lport *lp) | |
734 | { | |
735 | free_percpu(lp->dev_stats); | |
736 | } | |
737 | ||
738 | static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp) | |
739 | { | |
740 | return per_cpu_ptr(lp->dev_stats, smp_processor_id()); | |
741 | } | |
742 | ||
a0a25da2 VD |
743 | static inline void *lport_priv(const struct fc_lport *lp) |
744 | { | |
745 | return (void *)(lp + 1); | |
746 | } | |
747 | ||
748 | /** | |
749 | * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport | |
750 | * @sht: ptr to the scsi host templ | |
751 | * @priv_size: size of private data after fc_lport | |
752 | * | |
753 | * Returns: ptr to Scsi_Host | |
754 | */ | |
755 | static inline struct Scsi_Host * | |
756 | libfc_host_alloc(struct scsi_host_template *sht, int priv_size) | |
757 | { | |
758 | return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size); | |
759 | } | |
42e9a92f | 760 | |
34f42a07 | 761 | /* |
42e9a92f RL |
762 | * LOCAL PORT LAYER |
763 | *****************************/ | |
764 | int fc_lport_init(struct fc_lport *lp); | |
765 | ||
766 | /* | |
767 | * Destroy the specified local port by finding and freeing all | |
768 | * fc_rports associated with it and then by freeing the fc_lport | |
769 | * itself. | |
770 | */ | |
771 | int fc_lport_destroy(struct fc_lport *lp); | |
772 | ||
773 | /* | |
774 | * Logout the specified local port from the fabric | |
775 | */ | |
776 | int fc_fabric_logoff(struct fc_lport *lp); | |
777 | ||
778 | /* | |
779 | * Initiate the LP state machine. This handler will use fc_host_attr | |
780 | * to store the FLOGI service parameters, so fc_host_attr must be | |
781 | * initialized before calling this handler. | |
782 | */ | |
783 | int fc_fabric_login(struct fc_lport *lp); | |
784 | ||
785 | /* | |
786 | * The link is up for the given local port. | |
787 | */ | |
788 | void fc_linkup(struct fc_lport *); | |
789 | ||
790 | /* | |
791 | * Link is down for the given local port. | |
792 | */ | |
793 | void fc_linkdown(struct fc_lport *); | |
794 | ||
42e9a92f RL |
795 | /* |
796 | * Configure the local port. | |
797 | */ | |
798 | int fc_lport_config(struct fc_lport *); | |
799 | ||
800 | /* | |
801 | * Reset the local port. | |
802 | */ | |
803 | int fc_lport_reset(struct fc_lport *); | |
804 | ||
805 | /* | |
806 | * Set the mfs or reset | |
807 | */ | |
808 | int fc_set_mfs(struct fc_lport *lp, u32 mfs); | |
809 | ||
810 | ||
34f42a07 | 811 | /* |
42e9a92f RL |
812 | * REMOTE PORT LAYER |
813 | *****************************/ | |
814 | int fc_rport_init(struct fc_lport *lp); | |
815 | void fc_rport_terminate_io(struct fc_rport *rp); | |
816 | ||
34f42a07 | 817 | /* |
42e9a92f RL |
818 | * DISCOVERY LAYER |
819 | *****************************/ | |
820 | int fc_disc_init(struct fc_lport *lp); | |
821 | ||
822 | ||
34f42a07 | 823 | /* |
42e9a92f RL |
824 | * SCSI LAYER |
825 | *****************************/ | |
826 | /* | |
827 | * Initialize the SCSI block of libfc | |
828 | */ | |
829 | int fc_fcp_init(struct fc_lport *); | |
830 | ||
831 | /* | |
832 | * This section provides an API which allows direct interaction | |
833 | * with the SCSI-ml. Each of these functions satisfies a function | |
834 | * pointer defined in Scsi_Host and therefore is always called | |
835 | * directly from the SCSI-ml. | |
836 | */ | |
837 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, | |
838 | void (*done)(struct scsi_cmnd *)); | |
839 | ||
840 | /* | |
841 | * complete processing of a fcp packet | |
842 | * | |
843 | * This function may sleep if a fsp timer is pending. | |
844 | * The host lock must not be held by caller. | |
845 | */ | |
846 | void fc_fcp_complete(struct fc_fcp_pkt *fsp); | |
847 | ||
848 | /* | |
849 | * Send an ABTS frame to the target device. The sc_cmd argument | |
850 | * is a pointer to the SCSI command to be aborted. | |
851 | */ | |
852 | int fc_eh_abort(struct scsi_cmnd *sc_cmd); | |
853 | ||
854 | /* | |
855 | * Reset a LUN by sending send the tm cmd to the target. | |
856 | */ | |
857 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd); | |
858 | ||
859 | /* | |
860 | * Reset the host adapter. | |
861 | */ | |
862 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd); | |
863 | ||
864 | /* | |
865 | * Check rport status. | |
866 | */ | |
867 | int fc_slave_alloc(struct scsi_device *sdev); | |
868 | ||
869 | /* | |
870 | * Adjust the queue depth. | |
871 | */ | |
872 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth); | |
873 | ||
874 | /* | |
875 | * Change the tag type. | |
876 | */ | |
877 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type); | |
878 | ||
879 | /* | |
880 | * Free memory pools used by the FCP layer. | |
881 | */ | |
882 | void fc_fcp_destroy(struct fc_lport *); | |
883 | ||
b277d2aa YZ |
884 | /* |
885 | * Set up direct-data placement for this I/O request | |
886 | */ | |
887 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid); | |
888 | ||
34f42a07 | 889 | /* |
42e9a92f RL |
890 | * ELS/CT interface |
891 | *****************************/ | |
892 | /* | |
893 | * Initializes ELS/CT interface | |
894 | */ | |
895 | int fc_elsct_init(struct fc_lport *lp); | |
896 | ||
897 | ||
34f42a07 | 898 | /* |
42e9a92f RL |
899 | * EXCHANGE MANAGER LAYER |
900 | *****************************/ | |
901 | /* | |
902 | * Initializes Exchange Manager related | |
903 | * function pointers in struct libfc_function_template. | |
904 | */ | |
905 | int fc_exch_init(struct fc_lport *lp); | |
906 | ||
907 | /* | |
908 | * Allocates an Exchange Manager (EM). | |
909 | * | |
910 | * The EM manages exchanges for their allocation and | |
911 | * free, also allows exchange lookup for received | |
912 | * frame. | |
913 | * | |
914 | * The class is used for initializing FC class of | |
915 | * allocated exchange from EM. | |
916 | * | |
917 | * The min_xid and max_xid will limit new | |
918 | * exchange ID (XID) within this range for | |
919 | * a new exchange. | |
920 | * The LLD may choose to have multiple EMs, | |
921 | * e.g. one EM instance per CPU receive thread in LLD. | |
922 | * The LLD can use exch_get() of struct libfc_function_template | |
923 | * to specify XID for a new exchange within | |
924 | * a specified EM instance. | |
925 | * | |
926 | * The em_idx to uniquely identify an EM instance. | |
927 | */ | |
928 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, | |
929 | enum fc_class class, | |
930 | u16 min_xid, | |
931 | u16 max_xid); | |
932 | ||
933 | /* | |
934 | * Free an exchange manager. | |
935 | */ | |
936 | void fc_exch_mgr_free(struct fc_exch_mgr *mp); | |
937 | ||
938 | /* | |
939 | * Receive a frame on specified local port and exchange manager. | |
940 | */ | |
941 | void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp, | |
942 | struct fc_frame *fp); | |
943 | ||
944 | /* | |
945 | * This function is for exch_seq_send function pointer in | |
946 | * struct libfc_function_template, see comment block on | |
947 | * exch_seq_send for description of this function. | |
948 | */ | |
949 | struct fc_seq *fc_exch_seq_send(struct fc_lport *lp, | |
950 | struct fc_frame *fp, | |
951 | void (*resp)(struct fc_seq *sp, | |
952 | struct fc_frame *fp, | |
953 | void *arg), | |
954 | void (*destructor)(struct fc_seq *sp, | |
955 | void *arg), | |
956 | void *arg, u32 timer_msec); | |
957 | ||
958 | /* | |
959 | * send a frame using existing sequence and exchange. | |
960 | */ | |
961 | int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp); | |
962 | ||
963 | /* | |
964 | * Send ELS response using mainly infomation | |
965 | * in exchange and sequence in EM layer. | |
966 | */ | |
967 | void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, | |
968 | struct fc_seq_els_data *els_data); | |
969 | ||
970 | /* | |
971 | * This function is for seq_exch_abort function pointer in | |
972 | * struct libfc_function_template, see comment block on | |
973 | * seq_exch_abort for description of this function. | |
974 | */ | |
975 | int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec); | |
976 | ||
977 | /* | |
978 | * Indicate that an exchange/sequence tuple is complete and the memory | |
979 | * allocated for the related objects may be freed. | |
980 | */ | |
981 | void fc_exch_done(struct fc_seq *sp); | |
982 | ||
983 | /* | |
984 | * Assigns a EM and XID for a frame and then allocates | |
985 | * a new exchange and sequence pair. | |
986 | * The fp can be used to determine free XID. | |
987 | */ | |
988 | struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp); | |
989 | ||
990 | /* | |
991 | * Allocate a new exchange and sequence pair. | |
992 | * if ex_id is zero then next free exchange id | |
993 | * from specified exchange manger mp will be assigned. | |
994 | */ | |
995 | struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp, | |
996 | struct fc_frame *fp, u16 ex_id); | |
997 | /* | |
998 | * Start a new sequence on the same exchange as the supplied sequence. | |
999 | */ | |
1000 | struct fc_seq *fc_seq_start_next(struct fc_seq *sp); | |
1001 | ||
1002 | /* | |
1003 | * Reset an exchange manager, completing all sequences and exchanges. | |
1004 | * If s_id is non-zero, reset only exchanges originating from that FID. | |
1005 | * If d_id is non-zero, reset only exchanges sending to that FID. | |
1006 | */ | |
1f6ff364 | 1007 | void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id); |
42e9a92f RL |
1008 | |
1009 | /* | |
1010 | * Functions for fc_functions_template | |
1011 | */ | |
1012 | void fc_get_host_speed(struct Scsi_Host *shost); | |
1013 | void fc_get_host_port_type(struct Scsi_Host *shost); | |
1014 | void fc_get_host_port_state(struct Scsi_Host *shost); | |
1015 | void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout); | |
1016 | struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *); | |
1017 | ||
1018 | /* | |
1019 | * module setup functions. | |
1020 | */ | |
1021 | int fc_setup_exch_mgr(void); | |
1022 | void fc_destroy_exch_mgr(void); | |
1023 | int fc_setup_rport(void); | |
1024 | void fc_destroy_rport(void); | |
1025 | ||
1026 | #endif /* _LIBFC_H_ */ |