blob: e0c247724d2bc6aa352db42ffd2028e08bfc7222 [file] [log] [blame]
Robert Love42e9a922008-12-09 15:10:17 -08001/*
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/*
21 * PORT LOCKING NOTES
22 *
23 * These comments only apply to the 'port code' which consists of the lport,
24 * disc and rport blocks.
25 *
26 * MOTIVATION
27 *
28 * The lport, disc and rport blocks all have mutexes that are used to protect
29 * those objects. The main motivation for these locks is to prevent from
30 * having an lport reset just before we send a frame. In that scenario the
31 * lport's FID would get set to zero and then we'd send a frame with an
32 * invalid SID. We also need to ensure that states don't change unexpectedly
33 * while processing another state.
34 *
35 * HEIRARCHY
36 *
37 * The following heirarchy defines the locking rules. A greater lock
38 * may be held before acquiring a lesser lock, but a lesser lock should never
39 * be held while attempting to acquire a greater lock. Here is the heirarchy-
40 *
41 * lport > disc, lport > rport, disc > rport
42 *
43 * CALLBACKS
44 *
45 * The callbacks cause complications with this scheme. There is a callback
46 * from the rport (to either lport or disc) and a callback from disc
47 * (to the lport).
48 *
49 * As rports exit the rport state machine a callback is made to the owner of
50 * the rport to notify success or failure. Since the callback is likely to
51 * cause the lport or disc to grab its lock we cannot hold the rport lock
52 * while making the callback. To ensure that the rport is not free'd while
53 * processing the callback the rport callbacks are serialized through a
54 * single-threaded workqueue. An rport would never be free'd while in a
55 * callback handler becuase no other rport work in this queue can be executed
56 * at the same time.
57 *
58 * When discovery succeeds or fails a callback is made to the lport as
59 * notification. Currently, succesful discovery causes the lport to take no
60 * action. A failure will cause the lport to reset. There is likely a circular
61 * locking problem with this implementation.
62 */
63
64/*
65 * LPORT LOCKING
66 *
67 * The critical sections protected by the lport's mutex are quite broad and
68 * may be improved upon in the future. The lport code and its locking doesn't
69 * influence the I/O path, so excessive locking doesn't penalize I/O
70 * performance.
71 *
72 * The strategy is to lock whenever processing a request or response. Note
73 * that every _enter_* function corresponds to a state change. They generally
74 * change the lports state and then send a request out on the wire. We lock
75 * before calling any of these functions to protect that state change. This
76 * means that the entry points into the lport block manage the locks while
77 * the state machine can transition between states (i.e. _enter_* functions)
78 * while always staying protected.
79 *
80 * When handling responses we also hold the lport mutex broadly. When the
81 * lport receives the response frame it locks the mutex and then calls the
82 * appropriate handler for the particuar response. Generally a response will
83 * trigger a state change and so the lock must already be held.
84 *
85 * Retries also have to consider the locking. The retries occur from a work
86 * context and the work function will lock the lport and then retry the state
87 * (i.e. _enter_* function).
88 */
89
90#include <linux/timer.h>
91#include <asm/unaligned.h>
92
93#include <scsi/fc/fc_gs.h>
94
95#include <scsi/libfc.h>
96#include <scsi/fc_encode.h>
97
98/* Fabric IDs to use for point-to-point mode, chosen on whims. */
99#define FC_LOCAL_PTP_FID_LO 0x010101
100#define FC_LOCAL_PTP_FID_HI 0x010102
101
102#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
103
104static int fc_lport_debug;
105
106#define FC_DEBUG_LPORT(fmt...) \
107 do { \
108 if (fc_lport_debug) \
109 FC_DBG(fmt); \
110 } while (0)
111
112static void fc_lport_error(struct fc_lport *, struct fc_frame *);
113
114static void fc_lport_enter_reset(struct fc_lport *);
115static void fc_lport_enter_flogi(struct fc_lport *);
116static void fc_lport_enter_dns(struct fc_lport *);
117static void fc_lport_enter_rpn_id(struct fc_lport *);
118static void fc_lport_enter_rft_id(struct fc_lport *);
119static void fc_lport_enter_scr(struct fc_lport *);
120static void fc_lport_enter_ready(struct fc_lport *);
121static void fc_lport_enter_logo(struct fc_lport *);
122
123static const char *fc_lport_state_names[] = {
124 [LPORT_ST_NONE] = "none",
125 [LPORT_ST_FLOGI] = "FLOGI",
126 [LPORT_ST_DNS] = "dNS",
127 [LPORT_ST_RPN_ID] = "RPN_ID",
128 [LPORT_ST_RFT_ID] = "RFT_ID",
129 [LPORT_ST_SCR] = "SCR",
130 [LPORT_ST_READY] = "Ready",
131 [LPORT_ST_LOGO] = "LOGO",
132 [LPORT_ST_RESET] = "reset",
133};
134
135static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
136{
137 fc_frame_free(fp);
138 return 0;
139}
140
141/**
Robert Love34f42a02009-02-27 10:55:45 -0800142 * fc_lport_rport_callback() - Event handler for rport events
Robert Love42e9a922008-12-09 15:10:17 -0800143 * @lport: The lport which is receiving the event
144 * @rport: The rport which the event has occured on
145 * @event: The event that occured
146 *
147 * Locking Note: The rport lock should not be held when calling
148 * this function.
149 */
150static void fc_lport_rport_callback(struct fc_lport *lport,
151 struct fc_rport *rport,
152 enum fc_rport_event event)
153{
154 FC_DEBUG_LPORT("Received a %d event for port (%6x)\n", event,
155 rport->port_id);
156
157 switch (event) {
158 case RPORT_EV_CREATED:
159 if (rport->port_id == FC_FID_DIR_SERV) {
160 mutex_lock(&lport->lp_mutex);
161 if (lport->state == LPORT_ST_DNS) {
162 lport->dns_rp = rport;
163 fc_lport_enter_rpn_id(lport);
164 } else {
165 FC_DEBUG_LPORT("Received an CREATED event on "
166 "port (%6x) for the directory "
167 "server, but the lport is not "
168 "in the DNS state, it's in the "
169 "%d state", rport->port_id,
170 lport->state);
171 lport->tt.rport_logoff(rport);
172 }
173 mutex_unlock(&lport->lp_mutex);
174 } else
175 FC_DEBUG_LPORT("Received an event for port (%6x) "
176 "which is not the directory server\n",
177 rport->port_id);
178 break;
179 case RPORT_EV_LOGO:
180 case RPORT_EV_FAILED:
181 case RPORT_EV_STOP:
182 if (rport->port_id == FC_FID_DIR_SERV) {
183 mutex_lock(&lport->lp_mutex);
184 lport->dns_rp = NULL;
185 mutex_unlock(&lport->lp_mutex);
186
187 } else
188 FC_DEBUG_LPORT("Received an event for port (%6x) "
189 "which is not the directory server\n",
190 rport->port_id);
191 break;
192 case RPORT_EV_NONE:
193 break;
194 }
195}
196
197/**
Robert Love34f42a02009-02-27 10:55:45 -0800198 * fc_lport_state() - Return a string which represents the lport's state
Robert Love42e9a922008-12-09 15:10:17 -0800199 * @lport: The lport whose state is to converted to a string
200 */
201static const char *fc_lport_state(struct fc_lport *lport)
202{
203 const char *cp;
204
205 cp = fc_lport_state_names[lport->state];
206 if (!cp)
207 cp = "unknown";
208 return cp;
209}
210
211/**
Robert Love34f42a02009-02-27 10:55:45 -0800212 * fc_lport_ptp_setup() - Create an rport for point-to-point mode
Robert Love42e9a922008-12-09 15:10:17 -0800213 * @lport: The lport to attach the ptp rport to
214 * @fid: The FID of the ptp rport
215 * @remote_wwpn: The WWPN of the ptp rport
216 * @remote_wwnn: The WWNN of the ptp rport
217 */
218static void fc_lport_ptp_setup(struct fc_lport *lport,
219 u32 remote_fid, u64 remote_wwpn,
220 u64 remote_wwnn)
221{
222 struct fc_disc_port dp;
223
224 dp.lp = lport;
225 dp.ids.port_id = remote_fid;
226 dp.ids.port_name = remote_wwpn;
227 dp.ids.node_name = remote_wwnn;
228 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
229
230 if (lport->ptp_rp) {
231 lport->tt.rport_logoff(lport->ptp_rp);
232 lport->ptp_rp = NULL;
233 }
234
Robert Love5101ff92009-02-27 10:55:18 -0800235 lport->ptp_rp = lport->tt.rport_create(&dp);
Robert Love42e9a922008-12-09 15:10:17 -0800236
237 lport->tt.rport_login(lport->ptp_rp);
238
239 fc_lport_enter_ready(lport);
240}
241
242void fc_get_host_port_type(struct Scsi_Host *shost)
243{
244 /* TODO - currently just NPORT */
245 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
246}
247EXPORT_SYMBOL(fc_get_host_port_type);
248
249void fc_get_host_port_state(struct Scsi_Host *shost)
250{
251 struct fc_lport *lp = shost_priv(shost);
252
Vasu Devbc0e17f2009-02-27 10:54:57 -0800253 if (lp->link_up)
Robert Love42e9a922008-12-09 15:10:17 -0800254 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
255 else
256 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
257}
258EXPORT_SYMBOL(fc_get_host_port_state);
259
260void fc_get_host_speed(struct Scsi_Host *shost)
261{
262 struct fc_lport *lport = shost_priv(shost);
263
264 fc_host_speed(shost) = lport->link_speed;
265}
266EXPORT_SYMBOL(fc_get_host_speed);
267
268struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
269{
Robert Love42e9a922008-12-09 15:10:17 -0800270 struct fc_host_statistics *fcoe_stats;
271 struct fc_lport *lp = shost_priv(shost);
272 struct timespec v0, v1;
Robert Love582b45b2009-03-31 15:51:50 -0700273 unsigned int cpu;
Robert Love42e9a922008-12-09 15:10:17 -0800274
275 fcoe_stats = &lp->host_stats;
276 memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
277
278 jiffies_to_timespec(jiffies, &v0);
279 jiffies_to_timespec(lp->boot_time, &v1);
280 fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
281
Robert Love582b45b2009-03-31 15:51:50 -0700282 for_each_possible_cpu(cpu) {
283 struct fcoe_dev_stats *stats;
284
285 stats = per_cpu_ptr(lp->dev_stats, cpu);
286
Robert Love42e9a922008-12-09 15:10:17 -0800287 fcoe_stats->tx_frames += stats->TxFrames;
288 fcoe_stats->tx_words += stats->TxWords;
289 fcoe_stats->rx_frames += stats->RxFrames;
290 fcoe_stats->rx_words += stats->RxWords;
291 fcoe_stats->error_frames += stats->ErrorFrames;
292 fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
293 fcoe_stats->fcp_input_requests += stats->InputRequests;
294 fcoe_stats->fcp_output_requests += stats->OutputRequests;
295 fcoe_stats->fcp_control_requests += stats->ControlRequests;
296 fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
297 fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
298 fcoe_stats->link_failure_count += stats->LinkFailureCount;
299 }
300 fcoe_stats->lip_count = -1;
301 fcoe_stats->nos_count = -1;
302 fcoe_stats->loss_of_sync_count = -1;
303 fcoe_stats->loss_of_signal_count = -1;
304 fcoe_stats->prim_seq_protocol_err_count = -1;
305 fcoe_stats->dumped_frames = -1;
306 return fcoe_stats;
307}
308EXPORT_SYMBOL(fc_get_host_stats);
309
310/*
311 * Fill in FLOGI command for request.
312 */
313static void
314fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi,
315 unsigned int op)
316{
317 struct fc_els_csp *sp;
318 struct fc_els_cssp *cp;
319
320 memset(flogi, 0, sizeof(*flogi));
321 flogi->fl_cmd = (u8) op;
322 put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
323 put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
324 sp = &flogi->fl_csp;
325 sp->sp_hi_ver = 0x20;
326 sp->sp_lo_ver = 0x20;
327 sp->sp_bb_cred = htons(10); /* this gets set by gateway */
328 sp->sp_bb_data = htons((u16) lport->mfs);
329 cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
330 cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
331 if (op != ELS_FLOGI) {
332 sp->sp_features = htons(FC_SP_FT_CIRO);
333 sp->sp_tot_seq = htons(255); /* seq. we accept */
334 sp->sp_rel_off = htons(0x1f);
335 sp->sp_e_d_tov = htonl(lport->e_d_tov);
336
337 cp->cp_rdfs = htons((u16) lport->mfs);
338 cp->cp_con_seq = htons(255);
339 cp->cp_open_seq = 1;
340 }
341}
342
343/*
344 * Add a supported FC-4 type.
345 */
346static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
347{
348 __be32 *mp;
349
350 mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
351 *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
352}
353
354/**
Robert Love34f42a02009-02-27 10:55:45 -0800355 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
Robert Love42e9a922008-12-09 15:10:17 -0800356 * @lport: Fibre Channel local port recieving the RLIR
357 * @sp: current sequence in the RLIR exchange
358 * @fp: RLIR request frame
359 *
360 * Locking Note: The lport lock is exected to be held before calling
361 * this function.
362 */
363static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp,
364 struct fc_lport *lport)
365{
366 FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
367 fc_lport_state(lport));
368
369 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
370 fc_frame_free(fp);
371}
372
373/**
Robert Love34f42a02009-02-27 10:55:45 -0800374 * fc_lport_recv_echo_req() - Handle received ECHO request
Robert Love42e9a922008-12-09 15:10:17 -0800375 * @lport: Fibre Channel local port recieving the ECHO
376 * @sp: current sequence in the ECHO exchange
377 * @fp: ECHO request frame
378 *
379 * Locking Note: The lport lock is exected to be held before calling
380 * this function.
381 */
382static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
383 struct fc_lport *lport)
384{
385 struct fc_frame *fp;
386 struct fc_exch *ep = fc_seq_exch(sp);
387 unsigned int len;
388 void *pp;
389 void *dp;
390 u32 f_ctl;
391
392 FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
393 fc_lport_state(lport));
394
395 len = fr_len(in_fp) - sizeof(struct fc_frame_header);
396 pp = fc_frame_payload_get(in_fp, len);
397
398 if (len < sizeof(__be32))
399 len = sizeof(__be32);
400
401 fp = fc_frame_alloc(lport, len);
402 if (fp) {
403 dp = fc_frame_payload_get(fp, len);
404 memcpy(dp, pp, len);
405 *((u32 *)dp) = htonl(ELS_LS_ACC << 24);
406 sp = lport->tt.seq_start_next(sp);
407 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
408 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
409 FC_TYPE_ELS, f_ctl, 0);
410 lport->tt.seq_send(lport, sp, fp);
411 }
412 fc_frame_free(in_fp);
413}
414
415/**
Robert Love34f42a02009-02-27 10:55:45 -0800416 * fc_lport_recv_echo_req() - Handle received Request Node ID data request
Robert Love42e9a922008-12-09 15:10:17 -0800417 * @lport: Fibre Channel local port recieving the RNID
418 * @sp: current sequence in the RNID exchange
419 * @fp: RNID request frame
420 *
421 * Locking Note: The lport lock is exected to be held before calling
422 * this function.
423 */
424static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
425 struct fc_lport *lport)
426{
427 struct fc_frame *fp;
428 struct fc_exch *ep = fc_seq_exch(sp);
429 struct fc_els_rnid *req;
430 struct {
431 struct fc_els_rnid_resp rnid;
432 struct fc_els_rnid_cid cid;
433 struct fc_els_rnid_gen gen;
434 } *rp;
435 struct fc_seq_els_data rjt_data;
436 u8 fmt;
437 size_t len;
438 u32 f_ctl;
439
440 FC_DEBUG_LPORT("Received RNID request while in state %s\n",
441 fc_lport_state(lport));
442
443 req = fc_frame_payload_get(in_fp, sizeof(*req));
444 if (!req) {
445 rjt_data.fp = NULL;
446 rjt_data.reason = ELS_RJT_LOGIC;
447 rjt_data.explan = ELS_EXPL_NONE;
448 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
449 } else {
450 fmt = req->rnid_fmt;
451 len = sizeof(*rp);
452 if (fmt != ELS_RNIDF_GEN ||
453 ntohl(lport->rnid_gen.rnid_atype) == 0) {
454 fmt = ELS_RNIDF_NONE; /* nothing to provide */
455 len -= sizeof(rp->gen);
456 }
457 fp = fc_frame_alloc(lport, len);
458 if (fp) {
459 rp = fc_frame_payload_get(fp, len);
460 memset(rp, 0, len);
461 rp->rnid.rnid_cmd = ELS_LS_ACC;
462 rp->rnid.rnid_fmt = fmt;
463 rp->rnid.rnid_cid_len = sizeof(rp->cid);
464 rp->cid.rnid_wwpn = htonll(lport->wwpn);
465 rp->cid.rnid_wwnn = htonll(lport->wwnn);
466 if (fmt == ELS_RNIDF_GEN) {
467 rp->rnid.rnid_sid_len = sizeof(rp->gen);
468 memcpy(&rp->gen, &lport->rnid_gen,
469 sizeof(rp->gen));
470 }
471 sp = lport->tt.seq_start_next(sp);
472 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
473 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
474 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
475 FC_TYPE_ELS, f_ctl, 0);
476 lport->tt.seq_send(lport, sp, fp);
477 }
478 }
479 fc_frame_free(in_fp);
480}
481
482/**
Robert Love34f42a02009-02-27 10:55:45 -0800483 * fc_lport_recv_adisc_req() - Handle received Address Discovery Request
Robert Love42e9a922008-12-09 15:10:17 -0800484 * @lport: Fibre Channel local port recieving the ADISC
485 * @sp: current sequence in the ADISC exchange
486 * @fp: ADISC request frame
487 *
488 * Locking Note: The lport lock is expected to be held before calling
489 * this function.
490 */
491static void fc_lport_recv_adisc_req(struct fc_seq *sp, struct fc_frame *in_fp,
492 struct fc_lport *lport)
493{
494 struct fc_frame *fp;
495 struct fc_exch *ep = fc_seq_exch(sp);
496 struct fc_els_adisc *req, *rp;
497 struct fc_seq_els_data rjt_data;
498 size_t len;
499 u32 f_ctl;
500
501 FC_DEBUG_LPORT("Received ADISC request while in state %s\n",
502 fc_lport_state(lport));
503
504 req = fc_frame_payload_get(in_fp, sizeof(*req));
505 if (!req) {
506 rjt_data.fp = NULL;
507 rjt_data.reason = ELS_RJT_LOGIC;
508 rjt_data.explan = ELS_EXPL_NONE;
509 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
510 } else {
511 len = sizeof(*rp);
512 fp = fc_frame_alloc(lport, len);
513 if (fp) {
514 rp = fc_frame_payload_get(fp, len);
515 memset(rp, 0, len);
516 rp->adisc_cmd = ELS_LS_ACC;
517 rp->adisc_wwpn = htonll(lport->wwpn);
518 rp->adisc_wwnn = htonll(lport->wwnn);
519 hton24(rp->adisc_port_id,
520 fc_host_port_id(lport->host));
521 sp = lport->tt.seq_start_next(sp);
522 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
523 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
524 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
525 FC_TYPE_ELS, f_ctl, 0);
526 lport->tt.seq_send(lport, sp, fp);
527 }
528 }
529 fc_frame_free(in_fp);
530}
531
532/**
Robert Love34f42a02009-02-27 10:55:45 -0800533 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
Robert Love42e9a922008-12-09 15:10:17 -0800534 * @lport: Fibre Channel local port recieving the LOGO
535 * @sp: current sequence in the LOGO exchange
536 * @fp: LOGO request frame
537 *
538 * Locking Note: The lport lock is exected to be held before calling
539 * this function.
540 */
541static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp,
542 struct fc_lport *lport)
543{
544 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
545 fc_lport_enter_reset(lport);
546 fc_frame_free(fp);
547}
548
549/**
Robert Love34f42a02009-02-27 10:55:45 -0800550 * fc_fabric_login() - Start the lport state machine
Robert Love42e9a922008-12-09 15:10:17 -0800551 * @lport: The lport that should log into the fabric
552 *
553 * Locking Note: This function should not be called
554 * with the lport lock held.
555 */
556int fc_fabric_login(struct fc_lport *lport)
557{
558 int rc = -1;
559
560 mutex_lock(&lport->lp_mutex);
561 if (lport->state == LPORT_ST_NONE) {
562 fc_lport_enter_reset(lport);
563 rc = 0;
564 }
565 mutex_unlock(&lport->lp_mutex);
566
567 return rc;
568}
569EXPORT_SYMBOL(fc_fabric_login);
570
571/**
Robert Love34f42a02009-02-27 10:55:45 -0800572 * fc_linkup() - Handler for transport linkup events
Robert Love42e9a922008-12-09 15:10:17 -0800573 * @lport: The lport whose link is up
574 */
575void fc_linkup(struct fc_lport *lport)
576{
577 FC_DEBUG_LPORT("Link is up for port (%6x)\n",
578 fc_host_port_id(lport->host));
579
580 mutex_lock(&lport->lp_mutex);
Vasu Devbc0e17f2009-02-27 10:54:57 -0800581 if (!lport->link_up) {
582 lport->link_up = 1;
Robert Love42e9a922008-12-09 15:10:17 -0800583
584 if (lport->state == LPORT_ST_RESET)
585 fc_lport_enter_flogi(lport);
586 }
587 mutex_unlock(&lport->lp_mutex);
588}
589EXPORT_SYMBOL(fc_linkup);
590
591/**
Robert Love34f42a02009-02-27 10:55:45 -0800592 * fc_linkdown() - Handler for transport linkdown events
Robert Love42e9a922008-12-09 15:10:17 -0800593 * @lport: The lport whose link is down
594 */
595void fc_linkdown(struct fc_lport *lport)
596{
597 mutex_lock(&lport->lp_mutex);
598 FC_DEBUG_LPORT("Link is down for port (%6x)\n",
599 fc_host_port_id(lport->host));
600
Vasu Devbc0e17f2009-02-27 10:54:57 -0800601 if (lport->link_up) {
602 lport->link_up = 0;
Robert Love42e9a922008-12-09 15:10:17 -0800603 fc_lport_enter_reset(lport);
604 lport->tt.fcp_cleanup(lport);
605 }
606 mutex_unlock(&lport->lp_mutex);
607}
608EXPORT_SYMBOL(fc_linkdown);
609
610/**
Robert Love34f42a02009-02-27 10:55:45 -0800611 * fc_fabric_logoff() - Logout of the fabric
Robert Love42e9a922008-12-09 15:10:17 -0800612 * @lport: fc_lport pointer to logoff the fabric
613 *
614 * Return value:
615 * 0 for success, -1 for failure
Robert Love34f42a02009-02-27 10:55:45 -0800616 */
Robert Love42e9a922008-12-09 15:10:17 -0800617int fc_fabric_logoff(struct fc_lport *lport)
618{
619 lport->tt.disc_stop_final(lport);
620 mutex_lock(&lport->lp_mutex);
Abhijeet Joglekara0fd2e42009-04-21 16:27:09 -0700621 if (lport->dns_rp)
622 lport->tt.rport_logoff(lport->dns_rp);
623 mutex_unlock(&lport->lp_mutex);
624 lport->tt.rport_flush_queue();
625 mutex_lock(&lport->lp_mutex);
Robert Love42e9a922008-12-09 15:10:17 -0800626 fc_lport_enter_logo(lport);
627 mutex_unlock(&lport->lp_mutex);
Steve Maf7db2c152009-02-27 10:55:13 -0800628 cancel_delayed_work_sync(&lport->retry_work);
Robert Love42e9a922008-12-09 15:10:17 -0800629 return 0;
630}
631EXPORT_SYMBOL(fc_fabric_logoff);
632
633/**
Robert Love34f42a02009-02-27 10:55:45 -0800634 * fc_lport_destroy() - unregister a fc_lport
Robert Love42e9a922008-12-09 15:10:17 -0800635 * @lport: fc_lport pointer to unregister
636 *
637 * Return value:
638 * None
639 * Note:
640 * exit routine for fc_lport instance
641 * clean-up all the allocated memory
642 * and free up other system resources.
643 *
Robert Love34f42a02009-02-27 10:55:45 -0800644 */
Robert Love42e9a922008-12-09 15:10:17 -0800645int fc_lport_destroy(struct fc_lport *lport)
646{
Abhijeet Joglekarbbf15662009-04-21 16:27:14 -0700647 mutex_lock(&lport->lp_mutex);
648 lport->state = LPORT_ST_NONE;
649 lport->link_up = 0;
Robert Love42e9a922008-12-09 15:10:17 -0800650 lport->tt.frame_send = fc_frame_drop;
Abhijeet Joglekarbbf15662009-04-21 16:27:14 -0700651 mutex_unlock(&lport->lp_mutex);
652
Robert Love42e9a922008-12-09 15:10:17 -0800653 lport->tt.fcp_abort_io(lport);
Abhijeet Joglekar1f6ff362009-02-27 10:54:35 -0800654 lport->tt.exch_mgr_reset(lport, 0, 0);
Robert Love42e9a922008-12-09 15:10:17 -0800655 return 0;
656}
657EXPORT_SYMBOL(fc_lport_destroy);
658
659/**
Robert Love34f42a02009-02-27 10:55:45 -0800660 * fc_set_mfs() - sets up the mfs for the corresponding fc_lport
Robert Love42e9a922008-12-09 15:10:17 -0800661 * @lport: fc_lport pointer to unregister
662 * @mfs: the new mfs for fc_lport
663 *
664 * Set mfs for the given fc_lport to the new mfs.
665 *
666 * Return: 0 for success
Robert Love34f42a02009-02-27 10:55:45 -0800667 */
Robert Love42e9a922008-12-09 15:10:17 -0800668int fc_set_mfs(struct fc_lport *lport, u32 mfs)
669{
670 unsigned int old_mfs;
671 int rc = -EINVAL;
672
673 mutex_lock(&lport->lp_mutex);
674
675 old_mfs = lport->mfs;
676
677 if (mfs >= FC_MIN_MAX_FRAME) {
678 mfs &= ~3;
679 if (mfs > FC_MAX_FRAME)
680 mfs = FC_MAX_FRAME;
681 mfs -= sizeof(struct fc_frame_header);
682 lport->mfs = mfs;
683 rc = 0;
684 }
685
686 if (!rc && mfs < old_mfs)
687 fc_lport_enter_reset(lport);
688
689 mutex_unlock(&lport->lp_mutex);
690
691 return rc;
692}
693EXPORT_SYMBOL(fc_set_mfs);
694
695/**
Robert Love34f42a02009-02-27 10:55:45 -0800696 * fc_lport_disc_callback() - Callback for discovery events
Robert Love42e9a922008-12-09 15:10:17 -0800697 * @lport: FC local port
698 * @event: The discovery event
699 */
700void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event)
701{
702 switch (event) {
703 case DISC_EV_SUCCESS:
704 FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n",
705 fc_host_port_id(lport->host));
706 break;
707 case DISC_EV_FAILED:
708 FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n",
709 fc_host_port_id(lport->host));
710 mutex_lock(&lport->lp_mutex);
711 fc_lport_enter_reset(lport);
712 mutex_unlock(&lport->lp_mutex);
713 break;
714 case DISC_EV_NONE:
715 WARN_ON(1);
716 break;
717 }
718}
719
720/**
Robert Love34f42a02009-02-27 10:55:45 -0800721 * fc_rport_enter_ready() - Enter the ready state and start discovery
Robert Love42e9a922008-12-09 15:10:17 -0800722 * @lport: Fibre Channel local port that is ready
723 *
724 * Locking Note: The lport lock is expected to be held before calling
725 * this routine.
726 */
727static void fc_lport_enter_ready(struct fc_lport *lport)
728{
729 FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n",
730 fc_host_port_id(lport->host), fc_lport_state(lport));
731
732 fc_lport_state_enter(lport, LPORT_ST_READY);
733
734 lport->tt.disc_start(fc_lport_disc_callback, lport);
735}
736
737/**
Robert Love34f42a02009-02-27 10:55:45 -0800738 * fc_lport_recv_flogi_req() - Receive a FLOGI request
Robert Love42e9a922008-12-09 15:10:17 -0800739 * @sp_in: The sequence the FLOGI is on
740 * @rx_fp: The frame the FLOGI is in
741 * @lport: The lport that recieved the request
742 *
743 * A received FLOGI request indicates a point-to-point connection.
744 * Accept it with the common service parameters indicating our N port.
745 * Set up to do a PLOGI if we have the higher-number WWPN.
746 *
747 * Locking Note: The lport lock is exected to be held before calling
748 * this function.
749 */
750static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
751 struct fc_frame *rx_fp,
752 struct fc_lport *lport)
753{
754 struct fc_frame *fp;
755 struct fc_frame_header *fh;
756 struct fc_seq *sp;
757 struct fc_exch *ep;
758 struct fc_els_flogi *flp;
759 struct fc_els_flogi *new_flp;
760 u64 remote_wwpn;
761 u32 remote_fid;
762 u32 local_fid;
763 u32 f_ctl;
764
765 FC_DEBUG_LPORT("Received FLOGI request while in state %s\n",
766 fc_lport_state(lport));
767
768 fh = fc_frame_header_get(rx_fp);
769 remote_fid = ntoh24(fh->fh_s_id);
770 flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
771 if (!flp)
772 goto out;
773 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
774 if (remote_wwpn == lport->wwpn) {
775 FC_DBG("FLOGI from port with same WWPN %llx "
FUJITA Tomonori6e7490c2009-01-11 17:38:12 +0900776 "possible configuration error\n",
777 (unsigned long long)remote_wwpn);
Robert Love42e9a922008-12-09 15:10:17 -0800778 goto out;
779 }
FUJITA Tomonori6e7490c2009-01-11 17:38:12 +0900780 FC_DBG("FLOGI from port WWPN %llx\n", (unsigned long long)remote_wwpn);
Robert Love42e9a922008-12-09 15:10:17 -0800781
782 /*
783 * XXX what is the right thing to do for FIDs?
784 * The originator might expect our S_ID to be 0xfffffe.
785 * But if so, both of us could end up with the same FID.
786 */
787 local_fid = FC_LOCAL_PTP_FID_LO;
788 if (remote_wwpn < lport->wwpn) {
789 local_fid = FC_LOCAL_PTP_FID_HI;
790 if (!remote_fid || remote_fid == local_fid)
791 remote_fid = FC_LOCAL_PTP_FID_LO;
792 } else if (!remote_fid) {
793 remote_fid = FC_LOCAL_PTP_FID_HI;
794 }
795
796 fc_host_port_id(lport->host) = local_fid;
797
798 fp = fc_frame_alloc(lport, sizeof(*flp));
799 if (fp) {
800 sp = lport->tt.seq_start_next(fr_seq(rx_fp));
801 new_flp = fc_frame_payload_get(fp, sizeof(*flp));
802 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
803 new_flp->fl_cmd = (u8) ELS_LS_ACC;
804
805 /*
806 * Send the response. If this fails, the originator should
807 * repeat the sequence.
808 */
809 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
810 ep = fc_seq_exch(sp);
811 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
812 FC_TYPE_ELS, f_ctl, 0);
813 lport->tt.seq_send(lport, sp, fp);
814
815 } else {
816 fc_lport_error(lport, fp);
817 }
818 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
819 get_unaligned_be64(&flp->fl_wwnn));
820
821 lport->tt.disc_start(fc_lport_disc_callback, lport);
822
823out:
824 sp = fr_seq(rx_fp);
825 fc_frame_free(rx_fp);
826}
827
828/**
Robert Love34f42a02009-02-27 10:55:45 -0800829 * fc_lport_recv_req() - The generic lport request handler
Robert Love42e9a922008-12-09 15:10:17 -0800830 * @lport: The lport that received the request
831 * @sp: The sequence the request is on
832 * @fp: The frame the request is in
833 *
834 * This function will see if the lport handles the request or
835 * if an rport should handle the request.
836 *
837 * Locking Note: This function should not be called with the lport
838 * lock held becuase it will grab the lock.
839 */
840static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp,
841 struct fc_frame *fp)
842{
843 struct fc_frame_header *fh = fc_frame_header_get(fp);
844 void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *);
845 struct fc_rport *rport;
846 u32 s_id;
847 u32 d_id;
848 struct fc_seq_els_data rjt_data;
849
850 mutex_lock(&lport->lp_mutex);
851
852 /*
853 * Handle special ELS cases like FLOGI, LOGO, and
854 * RSCN here. These don't require a session.
855 * Even if we had a session, it might not be ready.
856 */
857 if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) {
858 /*
859 * Check opcode.
860 */
861 recv = NULL;
862 switch (fc_frame_payload_op(fp)) {
863 case ELS_FLOGI:
864 recv = fc_lport_recv_flogi_req;
865 break;
866 case ELS_LOGO:
867 fh = fc_frame_header_get(fp);
868 if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI)
869 recv = fc_lport_recv_logo_req;
870 break;
871 case ELS_RSCN:
872 recv = lport->tt.disc_recv_req;
873 break;
874 case ELS_ECHO:
875 recv = fc_lport_recv_echo_req;
876 break;
877 case ELS_RLIR:
878 recv = fc_lport_recv_rlir_req;
879 break;
880 case ELS_RNID:
881 recv = fc_lport_recv_rnid_req;
882 break;
883 case ELS_ADISC:
884 recv = fc_lport_recv_adisc_req;
885 break;
886 }
887
888 if (recv)
889 recv(sp, fp, lport);
890 else {
891 /*
892 * Find session.
893 * If this is a new incoming PLOGI, we won't find it.
894 */
895 s_id = ntoh24(fh->fh_s_id);
896 d_id = ntoh24(fh->fh_d_id);
897
898 rport = lport->tt.rport_lookup(lport, s_id);
899 if (rport)
900 lport->tt.rport_recv_req(sp, fp, rport);
901 else {
902 rjt_data.fp = NULL;
903 rjt_data.reason = ELS_RJT_UNAB;
904 rjt_data.explan = ELS_EXPL_NONE;
905 lport->tt.seq_els_rsp_send(sp,
906 ELS_LS_RJT,
907 &rjt_data);
908 fc_frame_free(fp);
909 }
910 }
911 } else {
912 FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp));
913 fc_frame_free(fp);
914 }
915 mutex_unlock(&lport->lp_mutex);
916
917 /*
918 * The common exch_done for all request may not be good
919 * if any request requires longer hold on exhange. XXX
920 */
921 lport->tt.exch_done(sp);
922}
923
924/**
Robert Love34f42a02009-02-27 10:55:45 -0800925 * fc_lport_reset() - Reset an lport
Robert Love42e9a922008-12-09 15:10:17 -0800926 * @lport: The lport which should be reset
927 *
928 * Locking Note: This functions should not be called with the
929 * lport lock held.
930 */
931int fc_lport_reset(struct fc_lport *lport)
932{
Steve Maf7db2c152009-02-27 10:55:13 -0800933 cancel_delayed_work_sync(&lport->retry_work);
Robert Love42e9a922008-12-09 15:10:17 -0800934 mutex_lock(&lport->lp_mutex);
935 fc_lport_enter_reset(lport);
936 mutex_unlock(&lport->lp_mutex);
937 return 0;
938}
939EXPORT_SYMBOL(fc_lport_reset);
940
941/**
Robert Love34f42a02009-02-27 10:55:45 -0800942 * fc_rport_enter_reset() - Reset the local port
Robert Love42e9a922008-12-09 15:10:17 -0800943 * @lport: Fibre Channel local port to be reset
944 *
945 * Locking Note: The lport lock is expected to be held before calling
946 * this routine.
947 */
948static void fc_lport_enter_reset(struct fc_lport *lport)
949{
950 FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n",
951 fc_host_port_id(lport->host), fc_lport_state(lport));
952
953 fc_lport_state_enter(lport, LPORT_ST_RESET);
954
955 if (lport->dns_rp)
956 lport->tt.rport_logoff(lport->dns_rp);
957
958 if (lport->ptp_rp) {
959 lport->tt.rport_logoff(lport->ptp_rp);
960 lport->ptp_rp = NULL;
961 }
962
963 lport->tt.disc_stop(lport);
964
Abhijeet Joglekar1f6ff362009-02-27 10:54:35 -0800965 lport->tt.exch_mgr_reset(lport, 0, 0);
Robert Love42e9a922008-12-09 15:10:17 -0800966 fc_host_fabric_name(lport->host) = 0;
967 fc_host_port_id(lport->host) = 0;
968
Vasu Devbc0e17f2009-02-27 10:54:57 -0800969 if (lport->link_up)
Robert Love42e9a922008-12-09 15:10:17 -0800970 fc_lport_enter_flogi(lport);
971}
972
973/**
Robert Love34f42a02009-02-27 10:55:45 -0800974 * fc_lport_error() - Handler for any errors
Robert Love42e9a922008-12-09 15:10:17 -0800975 * @lport: The fc_lport object
976 * @fp: The frame pointer
977 *
978 * If the error was caused by a resource allocation failure
979 * then wait for half a second and retry, otherwise retry
980 * after the e_d_tov time.
981 */
982static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
983{
984 unsigned long delay = 0;
985 FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n",
986 PTR_ERR(fp), fc_lport_state(lport),
987 lport->retry_count);
988
989 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
990 /*
991 * Memory allocation failure, or the exchange timed out.
992 * Retry after delay
993 */
994 if (lport->retry_count < lport->max_retry_count) {
995 lport->retry_count++;
996 if (!fp)
997 delay = msecs_to_jiffies(500);
998 else
999 delay = msecs_to_jiffies(lport->e_d_tov);
1000
1001 schedule_delayed_work(&lport->retry_work, delay);
1002 } else {
1003 switch (lport->state) {
1004 case LPORT_ST_NONE:
1005 case LPORT_ST_READY:
1006 case LPORT_ST_RESET:
1007 case LPORT_ST_RPN_ID:
1008 case LPORT_ST_RFT_ID:
1009 case LPORT_ST_SCR:
1010 case LPORT_ST_DNS:
1011 case LPORT_ST_FLOGI:
1012 case LPORT_ST_LOGO:
1013 fc_lport_enter_reset(lport);
1014 break;
1015 }
1016 }
1017 }
1018}
1019
1020/**
Robert Love34f42a02009-02-27 10:55:45 -08001021 * fc_lport_rft_id_resp() - Handle response to Register Fibre
1022 * Channel Types by ID (RPN_ID) request
Robert Love42e9a922008-12-09 15:10:17 -08001023 * @sp: current sequence in RPN_ID exchange
1024 * @fp: response frame
1025 * @lp_arg: Fibre Channel host port instance
1026 *
1027 * Locking Note: This function will be called without the lport lock
1028 * held, but it will lock, call an _enter_* function or fc_lport_error
1029 * and then unlock the lport.
1030 */
1031static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp,
1032 void *lp_arg)
1033{
1034 struct fc_lport *lport = lp_arg;
1035 struct fc_frame_header *fh;
1036 struct fc_ct_hdr *ct;
1037
1038 if (fp == ERR_PTR(-FC_EX_CLOSED))
1039 return;
1040
1041 mutex_lock(&lport->lp_mutex);
1042
1043 FC_DEBUG_LPORT("Received a RFT_ID response\n");
1044
1045 if (lport->state != LPORT_ST_RFT_ID) {
1046 FC_DBG("Received a RFT_ID response, but in state %s\n",
1047 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001048 if (IS_ERR(fp))
1049 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001050 goto out;
1051 }
1052
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001053 if (IS_ERR(fp)) {
1054 fc_lport_error(lport, fp);
1055 goto err;
1056 }
1057
Robert Love42e9a922008-12-09 15:10:17 -08001058 fh = fc_frame_header_get(fp);
1059 ct = fc_frame_payload_get(fp, sizeof(*ct));
1060
1061 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1062 ct->ct_fs_type == FC_FST_DIR &&
1063 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1064 ntohs(ct->ct_cmd) == FC_FS_ACC)
1065 fc_lport_enter_scr(lport);
1066 else
1067 fc_lport_error(lport, fp);
1068out:
1069 fc_frame_free(fp);
1070err:
1071 mutex_unlock(&lport->lp_mutex);
1072}
1073
1074/**
Robert Love34f42a02009-02-27 10:55:45 -08001075 * fc_lport_rpn_id_resp() - Handle response to Register Port
1076 * Name by ID (RPN_ID) request
Robert Love42e9a922008-12-09 15:10:17 -08001077 * @sp: current sequence in RPN_ID exchange
1078 * @fp: response frame
1079 * @lp_arg: Fibre Channel host port instance
1080 *
1081 * Locking Note: This function will be called without the lport lock
1082 * held, but it will lock, call an _enter_* function or fc_lport_error
1083 * and then unlock the lport.
1084 */
1085static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
1086 void *lp_arg)
1087{
1088 struct fc_lport *lport = lp_arg;
1089 struct fc_frame_header *fh;
1090 struct fc_ct_hdr *ct;
1091
1092 if (fp == ERR_PTR(-FC_EX_CLOSED))
1093 return;
1094
1095 mutex_lock(&lport->lp_mutex);
1096
1097 FC_DEBUG_LPORT("Received a RPN_ID response\n");
1098
1099 if (lport->state != LPORT_ST_RPN_ID) {
1100 FC_DBG("Received a RPN_ID response, but in state %s\n",
1101 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001102 if (IS_ERR(fp))
1103 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001104 goto out;
1105 }
1106
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001107 if (IS_ERR(fp)) {
1108 fc_lport_error(lport, fp);
1109 goto err;
1110 }
1111
Robert Love42e9a922008-12-09 15:10:17 -08001112 fh = fc_frame_header_get(fp);
1113 ct = fc_frame_payload_get(fp, sizeof(*ct));
1114 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1115 ct->ct_fs_type == FC_FST_DIR &&
1116 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1117 ntohs(ct->ct_cmd) == FC_FS_ACC)
1118 fc_lport_enter_rft_id(lport);
1119 else
1120 fc_lport_error(lport, fp);
1121
1122out:
1123 fc_frame_free(fp);
1124err:
1125 mutex_unlock(&lport->lp_mutex);
1126}
1127
1128/**
Robert Love34f42a02009-02-27 10:55:45 -08001129 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
Robert Love42e9a922008-12-09 15:10:17 -08001130 * @sp: current sequence in SCR exchange
1131 * @fp: response frame
1132 * @lp_arg: Fibre Channel lport port instance that sent the registration request
1133 *
1134 * Locking Note: This function will be called without the lport lock
1135 * held, but it will lock, call an _enter_* function or fc_lport_error
1136 * and then unlock the lport.
1137 */
1138static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1139 void *lp_arg)
1140{
1141 struct fc_lport *lport = lp_arg;
1142 u8 op;
1143
1144 if (fp == ERR_PTR(-FC_EX_CLOSED))
1145 return;
1146
1147 mutex_lock(&lport->lp_mutex);
1148
1149 FC_DEBUG_LPORT("Received a SCR response\n");
1150
1151 if (lport->state != LPORT_ST_SCR) {
1152 FC_DBG("Received a SCR response, but in state %s\n",
1153 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001154 if (IS_ERR(fp))
1155 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001156 goto out;
1157 }
1158
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001159 if (IS_ERR(fp)) {
1160 fc_lport_error(lport, fp);
1161 goto err;
1162 }
1163
Robert Love42e9a922008-12-09 15:10:17 -08001164 op = fc_frame_payload_op(fp);
1165 if (op == ELS_LS_ACC)
1166 fc_lport_enter_ready(lport);
1167 else
1168 fc_lport_error(lport, fp);
1169
1170out:
1171 fc_frame_free(fp);
1172err:
1173 mutex_unlock(&lport->lp_mutex);
1174}
1175
1176/**
Robert Love34f42a02009-02-27 10:55:45 -08001177 * fc_lport_enter_scr() - Send a State Change Register (SCR) request
Robert Love42e9a922008-12-09 15:10:17 -08001178 * @lport: Fibre Channel local port to register for state changes
1179 *
1180 * Locking Note: The lport lock is expected to be held before calling
1181 * this routine.
1182 */
1183static void fc_lport_enter_scr(struct fc_lport *lport)
1184{
1185 struct fc_frame *fp;
1186
1187 FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n",
1188 fc_host_port_id(lport->host), fc_lport_state(lport));
1189
1190 fc_lport_state_enter(lport, LPORT_ST_SCR);
1191
1192 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1193 if (!fp) {
1194 fc_lport_error(lport, fp);
1195 return;
1196 }
1197
1198 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR,
1199 fc_lport_scr_resp, lport, lport->e_d_tov))
1200 fc_lport_error(lport, fp);
1201}
1202
1203/**
Robert Love34f42a02009-02-27 10:55:45 -08001204 * fc_lport_enter_rft_id() - Register FC4-types with the name server
Robert Love42e9a922008-12-09 15:10:17 -08001205 * @lport: Fibre Channel local port to register
1206 *
1207 * Locking Note: The lport lock is expected to be held before calling
1208 * this routine.
1209 */
1210static void fc_lport_enter_rft_id(struct fc_lport *lport)
1211{
1212 struct fc_frame *fp;
1213 struct fc_ns_fts *lps;
1214 int i;
1215
1216 FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n",
1217 fc_host_port_id(lport->host), fc_lport_state(lport));
1218
1219 fc_lport_state_enter(lport, LPORT_ST_RFT_ID);
1220
1221 lps = &lport->fcts;
1222 i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]);
1223 while (--i >= 0)
1224 if (ntohl(lps->ff_type_map[i]) != 0)
1225 break;
1226 if (i < 0) {
1227 /* nothing to register, move on to SCR */
1228 fc_lport_enter_scr(lport);
1229 return;
1230 }
1231
1232 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
1233 sizeof(struct fc_ns_rft));
1234 if (!fp) {
1235 fc_lport_error(lport, fp);
1236 return;
1237 }
1238
1239 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID,
1240 fc_lport_rft_id_resp,
1241 lport, lport->e_d_tov))
1242 fc_lport_error(lport, fp);
1243}
1244
1245/**
Robert Love34f42a02009-02-27 10:55:45 -08001246 * fc_rport_enter_rft_id() - Register port name with the name server
Robert Love42e9a922008-12-09 15:10:17 -08001247 * @lport: Fibre Channel local port to register
1248 *
1249 * Locking Note: The lport lock is expected to be held before calling
1250 * this routine.
1251 */
1252static void fc_lport_enter_rpn_id(struct fc_lport *lport)
1253{
1254 struct fc_frame *fp;
1255
1256 FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n",
1257 fc_host_port_id(lport->host), fc_lport_state(lport));
1258
1259 fc_lport_state_enter(lport, LPORT_ST_RPN_ID);
1260
1261 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
1262 sizeof(struct fc_ns_rn_id));
1263 if (!fp) {
1264 fc_lport_error(lport, fp);
1265 return;
1266 }
1267
1268 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID,
1269 fc_lport_rpn_id_resp,
1270 lport, lport->e_d_tov))
1271 fc_lport_error(lport, fp);
1272}
1273
1274static struct fc_rport_operations fc_lport_rport_ops = {
1275 .event_callback = fc_lport_rport_callback,
1276};
1277
1278/**
Robert Love34f42a02009-02-27 10:55:45 -08001279 * fc_rport_enter_dns() - Create a rport to the name server
Robert Love42e9a922008-12-09 15:10:17 -08001280 * @lport: Fibre Channel local port requesting a rport for the name server
1281 *
1282 * Locking Note: The lport lock is expected to be held before calling
1283 * this routine.
1284 */
1285static void fc_lport_enter_dns(struct fc_lport *lport)
1286{
1287 struct fc_rport *rport;
1288 struct fc_rport_libfc_priv *rdata;
1289 struct fc_disc_port dp;
1290
1291 dp.ids.port_id = FC_FID_DIR_SERV;
1292 dp.ids.port_name = -1;
1293 dp.ids.node_name = -1;
1294 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
1295 dp.lp = lport;
1296
1297 FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n",
1298 fc_host_port_id(lport->host), fc_lport_state(lport));
1299
1300 fc_lport_state_enter(lport, LPORT_ST_DNS);
1301
Robert Love5101ff92009-02-27 10:55:18 -08001302 rport = lport->tt.rport_create(&dp);
Robert Love42e9a922008-12-09 15:10:17 -08001303 if (!rport)
1304 goto err;
1305
1306 rdata = rport->dd_data;
1307 rdata->ops = &fc_lport_rport_ops;
1308 lport->tt.rport_login(rport);
1309 return;
1310
1311err:
1312 fc_lport_error(lport, NULL);
1313}
1314
1315/**
Robert Love34f42a02009-02-27 10:55:45 -08001316 * fc_lport_timeout() - Handler for the retry_work timer.
Robert Love42e9a922008-12-09 15:10:17 -08001317 * @work: The work struct of the fc_lport
1318 */
1319static void fc_lport_timeout(struct work_struct *work)
1320{
1321 struct fc_lport *lport =
1322 container_of(work, struct fc_lport,
1323 retry_work.work);
1324
1325 mutex_lock(&lport->lp_mutex);
1326
1327 switch (lport->state) {
1328 case LPORT_ST_NONE:
1329 case LPORT_ST_READY:
1330 case LPORT_ST_RESET:
1331 WARN_ON(1);
1332 break;
1333 case LPORT_ST_FLOGI:
1334 fc_lport_enter_flogi(lport);
1335 break;
1336 case LPORT_ST_DNS:
1337 fc_lport_enter_dns(lport);
1338 break;
1339 case LPORT_ST_RPN_ID:
1340 fc_lport_enter_rpn_id(lport);
1341 break;
1342 case LPORT_ST_RFT_ID:
1343 fc_lport_enter_rft_id(lport);
1344 break;
1345 case LPORT_ST_SCR:
1346 fc_lport_enter_scr(lport);
1347 break;
1348 case LPORT_ST_LOGO:
1349 fc_lport_enter_logo(lport);
1350 break;
1351 }
1352
1353 mutex_unlock(&lport->lp_mutex);
1354}
1355
1356/**
Robert Love34f42a02009-02-27 10:55:45 -08001357 * fc_lport_logo_resp() - Handle response to LOGO request
Robert Love42e9a922008-12-09 15:10:17 -08001358 * @sp: current sequence in LOGO exchange
1359 * @fp: response frame
1360 * @lp_arg: Fibre Channel lport port instance that sent the LOGO request
1361 *
1362 * Locking Note: This function will be called without the lport lock
1363 * held, but it will lock, call an _enter_* function or fc_lport_error
1364 * and then unlock the lport.
1365 */
1366static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1367 void *lp_arg)
1368{
1369 struct fc_lport *lport = lp_arg;
1370 u8 op;
1371
1372 if (fp == ERR_PTR(-FC_EX_CLOSED))
1373 return;
1374
1375 mutex_lock(&lport->lp_mutex);
1376
1377 FC_DEBUG_LPORT("Received a LOGO response\n");
1378
1379 if (lport->state != LPORT_ST_LOGO) {
1380 FC_DBG("Received a LOGO response, but in state %s\n",
1381 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001382 if (IS_ERR(fp))
1383 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001384 goto out;
1385 }
1386
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001387 if (IS_ERR(fp)) {
1388 fc_lport_error(lport, fp);
1389 goto err;
1390 }
1391
Robert Love42e9a922008-12-09 15:10:17 -08001392 op = fc_frame_payload_op(fp);
1393 if (op == ELS_LS_ACC)
1394 fc_lport_enter_reset(lport);
1395 else
1396 fc_lport_error(lport, fp);
1397
1398out:
1399 fc_frame_free(fp);
1400err:
1401 mutex_unlock(&lport->lp_mutex);
1402}
1403
1404/**
Robert Love34f42a02009-02-27 10:55:45 -08001405 * fc_rport_enter_logo() - Logout of the fabric
Robert Love42e9a922008-12-09 15:10:17 -08001406 * @lport: Fibre Channel local port to be logged out
1407 *
1408 * Locking Note: The lport lock is expected to be held before calling
1409 * this routine.
1410 */
1411static void fc_lport_enter_logo(struct fc_lport *lport)
1412{
1413 struct fc_frame *fp;
1414 struct fc_els_logo *logo;
1415
1416 FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n",
1417 fc_host_port_id(lport->host), fc_lport_state(lport));
1418
1419 fc_lport_state_enter(lport, LPORT_ST_LOGO);
1420
Robert Love42e9a922008-12-09 15:10:17 -08001421 fp = fc_frame_alloc(lport, sizeof(*logo));
1422 if (!fp) {
1423 fc_lport_error(lport, fp);
1424 return;
1425 }
1426
1427 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp,
1428 lport, lport->e_d_tov))
1429 fc_lport_error(lport, fp);
1430}
1431
1432/**
Robert Love34f42a02009-02-27 10:55:45 -08001433 * fc_lport_flogi_resp() - Handle response to FLOGI request
Robert Love42e9a922008-12-09 15:10:17 -08001434 * @sp: current sequence in FLOGI exchange
1435 * @fp: response frame
1436 * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request
1437 *
1438 * Locking Note: This function will be called without the lport lock
1439 * held, but it will lock, call an _enter_* function or fc_lport_error
1440 * and then unlock the lport.
1441 */
1442static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1443 void *lp_arg)
1444{
1445 struct fc_lport *lport = lp_arg;
1446 struct fc_frame_header *fh;
1447 struct fc_els_flogi *flp;
1448 u32 did;
1449 u16 csp_flags;
1450 unsigned int r_a_tov;
1451 unsigned int e_d_tov;
1452 u16 mfs;
1453
1454 if (fp == ERR_PTR(-FC_EX_CLOSED))
1455 return;
1456
1457 mutex_lock(&lport->lp_mutex);
1458
1459 FC_DEBUG_LPORT("Received a FLOGI response\n");
1460
1461 if (lport->state != LPORT_ST_FLOGI) {
1462 FC_DBG("Received a FLOGI response, but in state %s\n",
1463 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001464 if (IS_ERR(fp))
1465 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001466 goto out;
1467 }
1468
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001469 if (IS_ERR(fp)) {
1470 fc_lport_error(lport, fp);
1471 goto err;
1472 }
1473
Robert Love42e9a922008-12-09 15:10:17 -08001474 fh = fc_frame_header_get(fp);
1475 did = ntoh24(fh->fh_d_id);
1476 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) {
1477
1478 FC_DEBUG_LPORT("Assigned fid %x\n", did);
1479 fc_host_port_id(lport->host) = did;
1480
1481 flp = fc_frame_payload_get(fp, sizeof(*flp));
1482 if (flp) {
1483 mfs = ntohs(flp->fl_csp.sp_bb_data) &
1484 FC_SP_BB_DATA_MASK;
1485 if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
1486 mfs < lport->mfs)
1487 lport->mfs = mfs;
1488 csp_flags = ntohs(flp->fl_csp.sp_features);
1489 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1490 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1491 if (csp_flags & FC_SP_FT_EDTR)
1492 e_d_tov /= 1000000;
1493 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1494 if (e_d_tov > lport->e_d_tov)
1495 lport->e_d_tov = e_d_tov;
1496 lport->r_a_tov = 2 * e_d_tov;
1497 FC_DBG("Point-to-Point mode\n");
1498 fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id),
1499 get_unaligned_be64(
1500 &flp->fl_wwpn),
1501 get_unaligned_be64(
1502 &flp->fl_wwnn));
1503 } else {
1504 lport->e_d_tov = e_d_tov;
1505 lport->r_a_tov = r_a_tov;
1506 fc_host_fabric_name(lport->host) =
1507 get_unaligned_be64(&flp->fl_wwnn);
1508 fc_lport_enter_dns(lport);
1509 }
1510 }
1511
1512 if (flp) {
1513 csp_flags = ntohs(flp->fl_csp.sp_features);
1514 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1515 lport->tt.disc_start(fc_lport_disc_callback,
1516 lport);
1517 }
1518 }
1519 } else {
1520 FC_DBG("bad FLOGI response\n");
1521 }
1522
1523out:
1524 fc_frame_free(fp);
1525err:
1526 mutex_unlock(&lport->lp_mutex);
1527}
1528
1529/**
Robert Love34f42a02009-02-27 10:55:45 -08001530 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
Robert Love42e9a922008-12-09 15:10:17 -08001531 * @lport: Fibre Channel local port to be logged in to the fabric
1532 *
1533 * Locking Note: The lport lock is expected to be held before calling
1534 * this routine.
1535 */
1536void fc_lport_enter_flogi(struct fc_lport *lport)
1537{
1538 struct fc_frame *fp;
1539
1540 FC_DEBUG_LPORT("Processing FLOGI state\n");
1541
1542 fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1543
1544 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1545 if (!fp)
1546 return fc_lport_error(lport, fp);
1547
1548 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI,
1549 fc_lport_flogi_resp, lport, lport->e_d_tov))
1550 fc_lport_error(lport, fp);
1551}
1552
1553/* Configure a fc_lport */
1554int fc_lport_config(struct fc_lport *lport)
1555{
1556 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1557 mutex_init(&lport->lp_mutex);
1558
1559 fc_lport_state_enter(lport, LPORT_ST_NONE);
1560
1561 fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1562 fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1563
1564 return 0;
1565}
1566EXPORT_SYMBOL(fc_lport_config);
1567
1568int fc_lport_init(struct fc_lport *lport)
1569{
1570 if (!lport->tt.lport_recv)
1571 lport->tt.lport_recv = fc_lport_recv_req;
1572
1573 if (!lport->tt.lport_reset)
1574 lport->tt.lport_reset = fc_lport_reset;
1575
1576 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
1577 fc_host_node_name(lport->host) = lport->wwnn;
1578 fc_host_port_name(lport->host) = lport->wwpn;
1579 fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
1580 memset(fc_host_supported_fc4s(lport->host), 0,
1581 sizeof(fc_host_supported_fc4s(lport->host)));
1582 fc_host_supported_fc4s(lport->host)[2] = 1;
1583 fc_host_supported_fc4s(lport->host)[7] = 1;
1584
1585 /* This value is also unchanging */
1586 memset(fc_host_active_fc4s(lport->host), 0,
1587 sizeof(fc_host_active_fc4s(lport->host)));
1588 fc_host_active_fc4s(lport->host)[2] = 1;
1589 fc_host_active_fc4s(lport->host)[7] = 1;
1590 fc_host_maxframe_size(lport->host) = lport->mfs;
1591 fc_host_supported_speeds(lport->host) = 0;
1592 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
1593 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
1594 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
1595 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
1596
1597 return 0;
1598}
1599EXPORT_SYMBOL(fc_lport_init);