blob: 4cd953378c57c4624e1ad5d0b6de4519988915a6 [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{
647 lport->tt.frame_send = fc_frame_drop;
648 lport->tt.fcp_abort_io(lport);
Abhijeet Joglekar1f6ff362009-02-27 10:54:35 -0800649 lport->tt.exch_mgr_reset(lport, 0, 0);
Robert Love42e9a922008-12-09 15:10:17 -0800650 return 0;
651}
652EXPORT_SYMBOL(fc_lport_destroy);
653
654/**
Robert Love34f42a02009-02-27 10:55:45 -0800655 * fc_set_mfs() - sets up the mfs for the corresponding fc_lport
Robert Love42e9a922008-12-09 15:10:17 -0800656 * @lport: fc_lport pointer to unregister
657 * @mfs: the new mfs for fc_lport
658 *
659 * Set mfs for the given fc_lport to the new mfs.
660 *
661 * Return: 0 for success
Robert Love34f42a02009-02-27 10:55:45 -0800662 */
Robert Love42e9a922008-12-09 15:10:17 -0800663int fc_set_mfs(struct fc_lport *lport, u32 mfs)
664{
665 unsigned int old_mfs;
666 int rc = -EINVAL;
667
668 mutex_lock(&lport->lp_mutex);
669
670 old_mfs = lport->mfs;
671
672 if (mfs >= FC_MIN_MAX_FRAME) {
673 mfs &= ~3;
674 if (mfs > FC_MAX_FRAME)
675 mfs = FC_MAX_FRAME;
676 mfs -= sizeof(struct fc_frame_header);
677 lport->mfs = mfs;
678 rc = 0;
679 }
680
681 if (!rc && mfs < old_mfs)
682 fc_lport_enter_reset(lport);
683
684 mutex_unlock(&lport->lp_mutex);
685
686 return rc;
687}
688EXPORT_SYMBOL(fc_set_mfs);
689
690/**
Robert Love34f42a02009-02-27 10:55:45 -0800691 * fc_lport_disc_callback() - Callback for discovery events
Robert Love42e9a922008-12-09 15:10:17 -0800692 * @lport: FC local port
693 * @event: The discovery event
694 */
695void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event)
696{
697 switch (event) {
698 case DISC_EV_SUCCESS:
699 FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n",
700 fc_host_port_id(lport->host));
701 break;
702 case DISC_EV_FAILED:
703 FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n",
704 fc_host_port_id(lport->host));
705 mutex_lock(&lport->lp_mutex);
706 fc_lport_enter_reset(lport);
707 mutex_unlock(&lport->lp_mutex);
708 break;
709 case DISC_EV_NONE:
710 WARN_ON(1);
711 break;
712 }
713}
714
715/**
Robert Love34f42a02009-02-27 10:55:45 -0800716 * fc_rport_enter_ready() - Enter the ready state and start discovery
Robert Love42e9a922008-12-09 15:10:17 -0800717 * @lport: Fibre Channel local port that is ready
718 *
719 * Locking Note: The lport lock is expected to be held before calling
720 * this routine.
721 */
722static void fc_lport_enter_ready(struct fc_lport *lport)
723{
724 FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n",
725 fc_host_port_id(lport->host), fc_lport_state(lport));
726
727 fc_lport_state_enter(lport, LPORT_ST_READY);
728
729 lport->tt.disc_start(fc_lport_disc_callback, lport);
730}
731
732/**
Robert Love34f42a02009-02-27 10:55:45 -0800733 * fc_lport_recv_flogi_req() - Receive a FLOGI request
Robert Love42e9a922008-12-09 15:10:17 -0800734 * @sp_in: The sequence the FLOGI is on
735 * @rx_fp: The frame the FLOGI is in
736 * @lport: The lport that recieved the request
737 *
738 * A received FLOGI request indicates a point-to-point connection.
739 * Accept it with the common service parameters indicating our N port.
740 * Set up to do a PLOGI if we have the higher-number WWPN.
741 *
742 * Locking Note: The lport lock is exected to be held before calling
743 * this function.
744 */
745static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
746 struct fc_frame *rx_fp,
747 struct fc_lport *lport)
748{
749 struct fc_frame *fp;
750 struct fc_frame_header *fh;
751 struct fc_seq *sp;
752 struct fc_exch *ep;
753 struct fc_els_flogi *flp;
754 struct fc_els_flogi *new_flp;
755 u64 remote_wwpn;
756 u32 remote_fid;
757 u32 local_fid;
758 u32 f_ctl;
759
760 FC_DEBUG_LPORT("Received FLOGI request while in state %s\n",
761 fc_lport_state(lport));
762
763 fh = fc_frame_header_get(rx_fp);
764 remote_fid = ntoh24(fh->fh_s_id);
765 flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
766 if (!flp)
767 goto out;
768 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
769 if (remote_wwpn == lport->wwpn) {
770 FC_DBG("FLOGI from port with same WWPN %llx "
FUJITA Tomonori6e7490c2009-01-11 17:38:12 +0900771 "possible configuration error\n",
772 (unsigned long long)remote_wwpn);
Robert Love42e9a922008-12-09 15:10:17 -0800773 goto out;
774 }
FUJITA Tomonori6e7490c2009-01-11 17:38:12 +0900775 FC_DBG("FLOGI from port WWPN %llx\n", (unsigned long long)remote_wwpn);
Robert Love42e9a922008-12-09 15:10:17 -0800776
777 /*
778 * XXX what is the right thing to do for FIDs?
779 * The originator might expect our S_ID to be 0xfffffe.
780 * But if so, both of us could end up with the same FID.
781 */
782 local_fid = FC_LOCAL_PTP_FID_LO;
783 if (remote_wwpn < lport->wwpn) {
784 local_fid = FC_LOCAL_PTP_FID_HI;
785 if (!remote_fid || remote_fid == local_fid)
786 remote_fid = FC_LOCAL_PTP_FID_LO;
787 } else if (!remote_fid) {
788 remote_fid = FC_LOCAL_PTP_FID_HI;
789 }
790
791 fc_host_port_id(lport->host) = local_fid;
792
793 fp = fc_frame_alloc(lport, sizeof(*flp));
794 if (fp) {
795 sp = lport->tt.seq_start_next(fr_seq(rx_fp));
796 new_flp = fc_frame_payload_get(fp, sizeof(*flp));
797 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
798 new_flp->fl_cmd = (u8) ELS_LS_ACC;
799
800 /*
801 * Send the response. If this fails, the originator should
802 * repeat the sequence.
803 */
804 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
805 ep = fc_seq_exch(sp);
806 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
807 FC_TYPE_ELS, f_ctl, 0);
808 lport->tt.seq_send(lport, sp, fp);
809
810 } else {
811 fc_lport_error(lport, fp);
812 }
813 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
814 get_unaligned_be64(&flp->fl_wwnn));
815
816 lport->tt.disc_start(fc_lport_disc_callback, lport);
817
818out:
819 sp = fr_seq(rx_fp);
820 fc_frame_free(rx_fp);
821}
822
823/**
Robert Love34f42a02009-02-27 10:55:45 -0800824 * fc_lport_recv_req() - The generic lport request handler
Robert Love42e9a922008-12-09 15:10:17 -0800825 * @lport: The lport that received the request
826 * @sp: The sequence the request is on
827 * @fp: The frame the request is in
828 *
829 * This function will see if the lport handles the request or
830 * if an rport should handle the request.
831 *
832 * Locking Note: This function should not be called with the lport
833 * lock held becuase it will grab the lock.
834 */
835static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp,
836 struct fc_frame *fp)
837{
838 struct fc_frame_header *fh = fc_frame_header_get(fp);
839 void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *);
840 struct fc_rport *rport;
841 u32 s_id;
842 u32 d_id;
843 struct fc_seq_els_data rjt_data;
844
845 mutex_lock(&lport->lp_mutex);
846
847 /*
848 * Handle special ELS cases like FLOGI, LOGO, and
849 * RSCN here. These don't require a session.
850 * Even if we had a session, it might not be ready.
851 */
852 if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) {
853 /*
854 * Check opcode.
855 */
856 recv = NULL;
857 switch (fc_frame_payload_op(fp)) {
858 case ELS_FLOGI:
859 recv = fc_lport_recv_flogi_req;
860 break;
861 case ELS_LOGO:
862 fh = fc_frame_header_get(fp);
863 if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI)
864 recv = fc_lport_recv_logo_req;
865 break;
866 case ELS_RSCN:
867 recv = lport->tt.disc_recv_req;
868 break;
869 case ELS_ECHO:
870 recv = fc_lport_recv_echo_req;
871 break;
872 case ELS_RLIR:
873 recv = fc_lport_recv_rlir_req;
874 break;
875 case ELS_RNID:
876 recv = fc_lport_recv_rnid_req;
877 break;
878 case ELS_ADISC:
879 recv = fc_lport_recv_adisc_req;
880 break;
881 }
882
883 if (recv)
884 recv(sp, fp, lport);
885 else {
886 /*
887 * Find session.
888 * If this is a new incoming PLOGI, we won't find it.
889 */
890 s_id = ntoh24(fh->fh_s_id);
891 d_id = ntoh24(fh->fh_d_id);
892
893 rport = lport->tt.rport_lookup(lport, s_id);
894 if (rport)
895 lport->tt.rport_recv_req(sp, fp, rport);
896 else {
897 rjt_data.fp = NULL;
898 rjt_data.reason = ELS_RJT_UNAB;
899 rjt_data.explan = ELS_EXPL_NONE;
900 lport->tt.seq_els_rsp_send(sp,
901 ELS_LS_RJT,
902 &rjt_data);
903 fc_frame_free(fp);
904 }
905 }
906 } else {
907 FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp));
908 fc_frame_free(fp);
909 }
910 mutex_unlock(&lport->lp_mutex);
911
912 /*
913 * The common exch_done for all request may not be good
914 * if any request requires longer hold on exhange. XXX
915 */
916 lport->tt.exch_done(sp);
917}
918
919/**
Robert Love34f42a02009-02-27 10:55:45 -0800920 * fc_lport_reset() - Reset an lport
Robert Love42e9a922008-12-09 15:10:17 -0800921 * @lport: The lport which should be reset
922 *
923 * Locking Note: This functions should not be called with the
924 * lport lock held.
925 */
926int fc_lport_reset(struct fc_lport *lport)
927{
Steve Maf7db2c152009-02-27 10:55:13 -0800928 cancel_delayed_work_sync(&lport->retry_work);
Robert Love42e9a922008-12-09 15:10:17 -0800929 mutex_lock(&lport->lp_mutex);
930 fc_lport_enter_reset(lport);
931 mutex_unlock(&lport->lp_mutex);
932 return 0;
933}
934EXPORT_SYMBOL(fc_lport_reset);
935
936/**
Robert Love34f42a02009-02-27 10:55:45 -0800937 * fc_rport_enter_reset() - Reset the local port
Robert Love42e9a922008-12-09 15:10:17 -0800938 * @lport: Fibre Channel local port to be reset
939 *
940 * Locking Note: The lport lock is expected to be held before calling
941 * this routine.
942 */
943static void fc_lport_enter_reset(struct fc_lport *lport)
944{
945 FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n",
946 fc_host_port_id(lport->host), fc_lport_state(lport));
947
948 fc_lport_state_enter(lport, LPORT_ST_RESET);
949
950 if (lport->dns_rp)
951 lport->tt.rport_logoff(lport->dns_rp);
952
953 if (lport->ptp_rp) {
954 lport->tt.rport_logoff(lport->ptp_rp);
955 lport->ptp_rp = NULL;
956 }
957
958 lport->tt.disc_stop(lport);
959
Abhijeet Joglekar1f6ff362009-02-27 10:54:35 -0800960 lport->tt.exch_mgr_reset(lport, 0, 0);
Robert Love42e9a922008-12-09 15:10:17 -0800961 fc_host_fabric_name(lport->host) = 0;
962 fc_host_port_id(lport->host) = 0;
963
Vasu Devbc0e17f2009-02-27 10:54:57 -0800964 if (lport->link_up)
Robert Love42e9a922008-12-09 15:10:17 -0800965 fc_lport_enter_flogi(lport);
966}
967
968/**
Robert Love34f42a02009-02-27 10:55:45 -0800969 * fc_lport_error() - Handler for any errors
Robert Love42e9a922008-12-09 15:10:17 -0800970 * @lport: The fc_lport object
971 * @fp: The frame pointer
972 *
973 * If the error was caused by a resource allocation failure
974 * then wait for half a second and retry, otherwise retry
975 * after the e_d_tov time.
976 */
977static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
978{
979 unsigned long delay = 0;
980 FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n",
981 PTR_ERR(fp), fc_lport_state(lport),
982 lport->retry_count);
983
984 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
985 /*
986 * Memory allocation failure, or the exchange timed out.
987 * Retry after delay
988 */
989 if (lport->retry_count < lport->max_retry_count) {
990 lport->retry_count++;
991 if (!fp)
992 delay = msecs_to_jiffies(500);
993 else
994 delay = msecs_to_jiffies(lport->e_d_tov);
995
996 schedule_delayed_work(&lport->retry_work, delay);
997 } else {
998 switch (lport->state) {
999 case LPORT_ST_NONE:
1000 case LPORT_ST_READY:
1001 case LPORT_ST_RESET:
1002 case LPORT_ST_RPN_ID:
1003 case LPORT_ST_RFT_ID:
1004 case LPORT_ST_SCR:
1005 case LPORT_ST_DNS:
1006 case LPORT_ST_FLOGI:
1007 case LPORT_ST_LOGO:
1008 fc_lport_enter_reset(lport);
1009 break;
1010 }
1011 }
1012 }
1013}
1014
1015/**
Robert Love34f42a02009-02-27 10:55:45 -08001016 * fc_lport_rft_id_resp() - Handle response to Register Fibre
1017 * Channel Types by ID (RPN_ID) request
Robert Love42e9a922008-12-09 15:10:17 -08001018 * @sp: current sequence in RPN_ID exchange
1019 * @fp: response frame
1020 * @lp_arg: Fibre Channel host port instance
1021 *
1022 * Locking Note: This function will be called without the lport lock
1023 * held, but it will lock, call an _enter_* function or fc_lport_error
1024 * and then unlock the lport.
1025 */
1026static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp,
1027 void *lp_arg)
1028{
1029 struct fc_lport *lport = lp_arg;
1030 struct fc_frame_header *fh;
1031 struct fc_ct_hdr *ct;
1032
1033 if (fp == ERR_PTR(-FC_EX_CLOSED))
1034 return;
1035
1036 mutex_lock(&lport->lp_mutex);
1037
1038 FC_DEBUG_LPORT("Received a RFT_ID response\n");
1039
1040 if (lport->state != LPORT_ST_RFT_ID) {
1041 FC_DBG("Received a RFT_ID response, but in state %s\n",
1042 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001043 if (IS_ERR(fp))
1044 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001045 goto out;
1046 }
1047
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001048 if (IS_ERR(fp)) {
1049 fc_lport_error(lport, fp);
1050 goto err;
1051 }
1052
Robert Love42e9a922008-12-09 15:10:17 -08001053 fh = fc_frame_header_get(fp);
1054 ct = fc_frame_payload_get(fp, sizeof(*ct));
1055
1056 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1057 ct->ct_fs_type == FC_FST_DIR &&
1058 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1059 ntohs(ct->ct_cmd) == FC_FS_ACC)
1060 fc_lport_enter_scr(lport);
1061 else
1062 fc_lport_error(lport, fp);
1063out:
1064 fc_frame_free(fp);
1065err:
1066 mutex_unlock(&lport->lp_mutex);
1067}
1068
1069/**
Robert Love34f42a02009-02-27 10:55:45 -08001070 * fc_lport_rpn_id_resp() - Handle response to Register Port
1071 * Name by ID (RPN_ID) request
Robert Love42e9a922008-12-09 15:10:17 -08001072 * @sp: current sequence in RPN_ID exchange
1073 * @fp: response frame
1074 * @lp_arg: Fibre Channel host port instance
1075 *
1076 * Locking Note: This function will be called without the lport lock
1077 * held, but it will lock, call an _enter_* function or fc_lport_error
1078 * and then unlock the lport.
1079 */
1080static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
1081 void *lp_arg)
1082{
1083 struct fc_lport *lport = lp_arg;
1084 struct fc_frame_header *fh;
1085 struct fc_ct_hdr *ct;
1086
1087 if (fp == ERR_PTR(-FC_EX_CLOSED))
1088 return;
1089
1090 mutex_lock(&lport->lp_mutex);
1091
1092 FC_DEBUG_LPORT("Received a RPN_ID response\n");
1093
1094 if (lport->state != LPORT_ST_RPN_ID) {
1095 FC_DBG("Received a RPN_ID response, but in state %s\n",
1096 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001097 if (IS_ERR(fp))
1098 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001099 goto out;
1100 }
1101
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001102 if (IS_ERR(fp)) {
1103 fc_lport_error(lport, fp);
1104 goto err;
1105 }
1106
Robert Love42e9a922008-12-09 15:10:17 -08001107 fh = fc_frame_header_get(fp);
1108 ct = fc_frame_payload_get(fp, sizeof(*ct));
1109 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1110 ct->ct_fs_type == FC_FST_DIR &&
1111 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1112 ntohs(ct->ct_cmd) == FC_FS_ACC)
1113 fc_lport_enter_rft_id(lport);
1114 else
1115 fc_lport_error(lport, fp);
1116
1117out:
1118 fc_frame_free(fp);
1119err:
1120 mutex_unlock(&lport->lp_mutex);
1121}
1122
1123/**
Robert Love34f42a02009-02-27 10:55:45 -08001124 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
Robert Love42e9a922008-12-09 15:10:17 -08001125 * @sp: current sequence in SCR exchange
1126 * @fp: response frame
1127 * @lp_arg: Fibre Channel lport port instance that sent the registration request
1128 *
1129 * Locking Note: This function will be called without the lport lock
1130 * held, but it will lock, call an _enter_* function or fc_lport_error
1131 * and then unlock the lport.
1132 */
1133static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1134 void *lp_arg)
1135{
1136 struct fc_lport *lport = lp_arg;
1137 u8 op;
1138
1139 if (fp == ERR_PTR(-FC_EX_CLOSED))
1140 return;
1141
1142 mutex_lock(&lport->lp_mutex);
1143
1144 FC_DEBUG_LPORT("Received a SCR response\n");
1145
1146 if (lport->state != LPORT_ST_SCR) {
1147 FC_DBG("Received a SCR response, but in state %s\n",
1148 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001149 if (IS_ERR(fp))
1150 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001151 goto out;
1152 }
1153
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001154 if (IS_ERR(fp)) {
1155 fc_lport_error(lport, fp);
1156 goto err;
1157 }
1158
Robert Love42e9a922008-12-09 15:10:17 -08001159 op = fc_frame_payload_op(fp);
1160 if (op == ELS_LS_ACC)
1161 fc_lport_enter_ready(lport);
1162 else
1163 fc_lport_error(lport, fp);
1164
1165out:
1166 fc_frame_free(fp);
1167err:
1168 mutex_unlock(&lport->lp_mutex);
1169}
1170
1171/**
Robert Love34f42a02009-02-27 10:55:45 -08001172 * fc_lport_enter_scr() - Send a State Change Register (SCR) request
Robert Love42e9a922008-12-09 15:10:17 -08001173 * @lport: Fibre Channel local port to register for state changes
1174 *
1175 * Locking Note: The lport lock is expected to be held before calling
1176 * this routine.
1177 */
1178static void fc_lport_enter_scr(struct fc_lport *lport)
1179{
1180 struct fc_frame *fp;
1181
1182 FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n",
1183 fc_host_port_id(lport->host), fc_lport_state(lport));
1184
1185 fc_lport_state_enter(lport, LPORT_ST_SCR);
1186
1187 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1188 if (!fp) {
1189 fc_lport_error(lport, fp);
1190 return;
1191 }
1192
1193 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR,
1194 fc_lport_scr_resp, lport, lport->e_d_tov))
1195 fc_lport_error(lport, fp);
1196}
1197
1198/**
Robert Love34f42a02009-02-27 10:55:45 -08001199 * fc_lport_enter_rft_id() - Register FC4-types with the name server
Robert Love42e9a922008-12-09 15:10:17 -08001200 * @lport: Fibre Channel local port to register
1201 *
1202 * Locking Note: The lport lock is expected to be held before calling
1203 * this routine.
1204 */
1205static void fc_lport_enter_rft_id(struct fc_lport *lport)
1206{
1207 struct fc_frame *fp;
1208 struct fc_ns_fts *lps;
1209 int i;
1210
1211 FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n",
1212 fc_host_port_id(lport->host), fc_lport_state(lport));
1213
1214 fc_lport_state_enter(lport, LPORT_ST_RFT_ID);
1215
1216 lps = &lport->fcts;
1217 i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]);
1218 while (--i >= 0)
1219 if (ntohl(lps->ff_type_map[i]) != 0)
1220 break;
1221 if (i < 0) {
1222 /* nothing to register, move on to SCR */
1223 fc_lport_enter_scr(lport);
1224 return;
1225 }
1226
1227 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
1228 sizeof(struct fc_ns_rft));
1229 if (!fp) {
1230 fc_lport_error(lport, fp);
1231 return;
1232 }
1233
1234 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID,
1235 fc_lport_rft_id_resp,
1236 lport, lport->e_d_tov))
1237 fc_lport_error(lport, fp);
1238}
1239
1240/**
Robert Love34f42a02009-02-27 10:55:45 -08001241 * fc_rport_enter_rft_id() - Register port name with the name server
Robert Love42e9a922008-12-09 15:10:17 -08001242 * @lport: Fibre Channel local port to register
1243 *
1244 * Locking Note: The lport lock is expected to be held before calling
1245 * this routine.
1246 */
1247static void fc_lport_enter_rpn_id(struct fc_lport *lport)
1248{
1249 struct fc_frame *fp;
1250
1251 FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n",
1252 fc_host_port_id(lport->host), fc_lport_state(lport));
1253
1254 fc_lport_state_enter(lport, LPORT_ST_RPN_ID);
1255
1256 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
1257 sizeof(struct fc_ns_rn_id));
1258 if (!fp) {
1259 fc_lport_error(lport, fp);
1260 return;
1261 }
1262
1263 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID,
1264 fc_lport_rpn_id_resp,
1265 lport, lport->e_d_tov))
1266 fc_lport_error(lport, fp);
1267}
1268
1269static struct fc_rport_operations fc_lport_rport_ops = {
1270 .event_callback = fc_lport_rport_callback,
1271};
1272
1273/**
Robert Love34f42a02009-02-27 10:55:45 -08001274 * fc_rport_enter_dns() - Create a rport to the name server
Robert Love42e9a922008-12-09 15:10:17 -08001275 * @lport: Fibre Channel local port requesting a rport for the name server
1276 *
1277 * Locking Note: The lport lock is expected to be held before calling
1278 * this routine.
1279 */
1280static void fc_lport_enter_dns(struct fc_lport *lport)
1281{
1282 struct fc_rport *rport;
1283 struct fc_rport_libfc_priv *rdata;
1284 struct fc_disc_port dp;
1285
1286 dp.ids.port_id = FC_FID_DIR_SERV;
1287 dp.ids.port_name = -1;
1288 dp.ids.node_name = -1;
1289 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
1290 dp.lp = lport;
1291
1292 FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n",
1293 fc_host_port_id(lport->host), fc_lport_state(lport));
1294
1295 fc_lport_state_enter(lport, LPORT_ST_DNS);
1296
Robert Love5101ff92009-02-27 10:55:18 -08001297 rport = lport->tt.rport_create(&dp);
Robert Love42e9a922008-12-09 15:10:17 -08001298 if (!rport)
1299 goto err;
1300
1301 rdata = rport->dd_data;
1302 rdata->ops = &fc_lport_rport_ops;
1303 lport->tt.rport_login(rport);
1304 return;
1305
1306err:
1307 fc_lport_error(lport, NULL);
1308}
1309
1310/**
Robert Love34f42a02009-02-27 10:55:45 -08001311 * fc_lport_timeout() - Handler for the retry_work timer.
Robert Love42e9a922008-12-09 15:10:17 -08001312 * @work: The work struct of the fc_lport
1313 */
1314static void fc_lport_timeout(struct work_struct *work)
1315{
1316 struct fc_lport *lport =
1317 container_of(work, struct fc_lport,
1318 retry_work.work);
1319
1320 mutex_lock(&lport->lp_mutex);
1321
1322 switch (lport->state) {
1323 case LPORT_ST_NONE:
1324 case LPORT_ST_READY:
1325 case LPORT_ST_RESET:
1326 WARN_ON(1);
1327 break;
1328 case LPORT_ST_FLOGI:
1329 fc_lport_enter_flogi(lport);
1330 break;
1331 case LPORT_ST_DNS:
1332 fc_lport_enter_dns(lport);
1333 break;
1334 case LPORT_ST_RPN_ID:
1335 fc_lport_enter_rpn_id(lport);
1336 break;
1337 case LPORT_ST_RFT_ID:
1338 fc_lport_enter_rft_id(lport);
1339 break;
1340 case LPORT_ST_SCR:
1341 fc_lport_enter_scr(lport);
1342 break;
1343 case LPORT_ST_LOGO:
1344 fc_lport_enter_logo(lport);
1345 break;
1346 }
1347
1348 mutex_unlock(&lport->lp_mutex);
1349}
1350
1351/**
Robert Love34f42a02009-02-27 10:55:45 -08001352 * fc_lport_logo_resp() - Handle response to LOGO request
Robert Love42e9a922008-12-09 15:10:17 -08001353 * @sp: current sequence in LOGO exchange
1354 * @fp: response frame
1355 * @lp_arg: Fibre Channel lport port instance that sent the LOGO request
1356 *
1357 * Locking Note: This function will be called without the lport lock
1358 * held, but it will lock, call an _enter_* function or fc_lport_error
1359 * and then unlock the lport.
1360 */
1361static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1362 void *lp_arg)
1363{
1364 struct fc_lport *lport = lp_arg;
1365 u8 op;
1366
1367 if (fp == ERR_PTR(-FC_EX_CLOSED))
1368 return;
1369
1370 mutex_lock(&lport->lp_mutex);
1371
1372 FC_DEBUG_LPORT("Received a LOGO response\n");
1373
1374 if (lport->state != LPORT_ST_LOGO) {
1375 FC_DBG("Received a LOGO response, but in state %s\n",
1376 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001377 if (IS_ERR(fp))
1378 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001379 goto out;
1380 }
1381
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001382 if (IS_ERR(fp)) {
1383 fc_lport_error(lport, fp);
1384 goto err;
1385 }
1386
Robert Love42e9a922008-12-09 15:10:17 -08001387 op = fc_frame_payload_op(fp);
1388 if (op == ELS_LS_ACC)
1389 fc_lport_enter_reset(lport);
1390 else
1391 fc_lport_error(lport, fp);
1392
1393out:
1394 fc_frame_free(fp);
1395err:
1396 mutex_unlock(&lport->lp_mutex);
1397}
1398
1399/**
Robert Love34f42a02009-02-27 10:55:45 -08001400 * fc_rport_enter_logo() - Logout of the fabric
Robert Love42e9a922008-12-09 15:10:17 -08001401 * @lport: Fibre Channel local port to be logged out
1402 *
1403 * Locking Note: The lport lock is expected to be held before calling
1404 * this routine.
1405 */
1406static void fc_lport_enter_logo(struct fc_lport *lport)
1407{
1408 struct fc_frame *fp;
1409 struct fc_els_logo *logo;
1410
1411 FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n",
1412 fc_host_port_id(lport->host), fc_lport_state(lport));
1413
1414 fc_lport_state_enter(lport, LPORT_ST_LOGO);
1415
Robert Love42e9a922008-12-09 15:10:17 -08001416 fp = fc_frame_alloc(lport, sizeof(*logo));
1417 if (!fp) {
1418 fc_lport_error(lport, fp);
1419 return;
1420 }
1421
1422 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp,
1423 lport, lport->e_d_tov))
1424 fc_lport_error(lport, fp);
1425}
1426
1427/**
Robert Love34f42a02009-02-27 10:55:45 -08001428 * fc_lport_flogi_resp() - Handle response to FLOGI request
Robert Love42e9a922008-12-09 15:10:17 -08001429 * @sp: current sequence in FLOGI exchange
1430 * @fp: response frame
1431 * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request
1432 *
1433 * Locking Note: This function will be called without the lport lock
1434 * held, but it will lock, call an _enter_* function or fc_lport_error
1435 * and then unlock the lport.
1436 */
1437static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1438 void *lp_arg)
1439{
1440 struct fc_lport *lport = lp_arg;
1441 struct fc_frame_header *fh;
1442 struct fc_els_flogi *flp;
1443 u32 did;
1444 u16 csp_flags;
1445 unsigned int r_a_tov;
1446 unsigned int e_d_tov;
1447 u16 mfs;
1448
1449 if (fp == ERR_PTR(-FC_EX_CLOSED))
1450 return;
1451
1452 mutex_lock(&lport->lp_mutex);
1453
1454 FC_DEBUG_LPORT("Received a FLOGI response\n");
1455
1456 if (lport->state != LPORT_ST_FLOGI) {
1457 FC_DBG("Received a FLOGI response, but in state %s\n",
1458 fc_lport_state(lport));
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001459 if (IS_ERR(fp))
1460 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08001461 goto out;
1462 }
1463
Abhijeet Joglekar76f68042009-04-21 16:26:58 -07001464 if (IS_ERR(fp)) {
1465 fc_lport_error(lport, fp);
1466 goto err;
1467 }
1468
Robert Love42e9a922008-12-09 15:10:17 -08001469 fh = fc_frame_header_get(fp);
1470 did = ntoh24(fh->fh_d_id);
1471 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) {
1472
1473 FC_DEBUG_LPORT("Assigned fid %x\n", did);
1474 fc_host_port_id(lport->host) = did;
1475
1476 flp = fc_frame_payload_get(fp, sizeof(*flp));
1477 if (flp) {
1478 mfs = ntohs(flp->fl_csp.sp_bb_data) &
1479 FC_SP_BB_DATA_MASK;
1480 if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
1481 mfs < lport->mfs)
1482 lport->mfs = mfs;
1483 csp_flags = ntohs(flp->fl_csp.sp_features);
1484 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1485 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1486 if (csp_flags & FC_SP_FT_EDTR)
1487 e_d_tov /= 1000000;
1488 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1489 if (e_d_tov > lport->e_d_tov)
1490 lport->e_d_tov = e_d_tov;
1491 lport->r_a_tov = 2 * e_d_tov;
1492 FC_DBG("Point-to-Point mode\n");
1493 fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id),
1494 get_unaligned_be64(
1495 &flp->fl_wwpn),
1496 get_unaligned_be64(
1497 &flp->fl_wwnn));
1498 } else {
1499 lport->e_d_tov = e_d_tov;
1500 lport->r_a_tov = r_a_tov;
1501 fc_host_fabric_name(lport->host) =
1502 get_unaligned_be64(&flp->fl_wwnn);
1503 fc_lport_enter_dns(lport);
1504 }
1505 }
1506
1507 if (flp) {
1508 csp_flags = ntohs(flp->fl_csp.sp_features);
1509 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1510 lport->tt.disc_start(fc_lport_disc_callback,
1511 lport);
1512 }
1513 }
1514 } else {
1515 FC_DBG("bad FLOGI response\n");
1516 }
1517
1518out:
1519 fc_frame_free(fp);
1520err:
1521 mutex_unlock(&lport->lp_mutex);
1522}
1523
1524/**
Robert Love34f42a02009-02-27 10:55:45 -08001525 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
Robert Love42e9a922008-12-09 15:10:17 -08001526 * @lport: Fibre Channel local port to be logged in to the fabric
1527 *
1528 * Locking Note: The lport lock is expected to be held before calling
1529 * this routine.
1530 */
1531void fc_lport_enter_flogi(struct fc_lport *lport)
1532{
1533 struct fc_frame *fp;
1534
1535 FC_DEBUG_LPORT("Processing FLOGI state\n");
1536
1537 fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1538
1539 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1540 if (!fp)
1541 return fc_lport_error(lport, fp);
1542
1543 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI,
1544 fc_lport_flogi_resp, lport, lport->e_d_tov))
1545 fc_lport_error(lport, fp);
1546}
1547
1548/* Configure a fc_lport */
1549int fc_lport_config(struct fc_lport *lport)
1550{
1551 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1552 mutex_init(&lport->lp_mutex);
1553
1554 fc_lport_state_enter(lport, LPORT_ST_NONE);
1555
1556 fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1557 fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1558
1559 return 0;
1560}
1561EXPORT_SYMBOL(fc_lport_config);
1562
1563int fc_lport_init(struct fc_lport *lport)
1564{
1565 if (!lport->tt.lport_recv)
1566 lport->tt.lport_recv = fc_lport_recv_req;
1567
1568 if (!lport->tt.lport_reset)
1569 lport->tt.lport_reset = fc_lport_reset;
1570
1571 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
1572 fc_host_node_name(lport->host) = lport->wwnn;
1573 fc_host_port_name(lport->host) = lport->wwpn;
1574 fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
1575 memset(fc_host_supported_fc4s(lport->host), 0,
1576 sizeof(fc_host_supported_fc4s(lport->host)));
1577 fc_host_supported_fc4s(lport->host)[2] = 1;
1578 fc_host_supported_fc4s(lport->host)[7] = 1;
1579
1580 /* This value is also unchanging */
1581 memset(fc_host_active_fc4s(lport->host), 0,
1582 sizeof(fc_host_active_fc4s(lport->host)));
1583 fc_host_active_fc4s(lport->host)[2] = 1;
1584 fc_host_active_fc4s(lport->host)[7] = 1;
1585 fc_host_maxframe_size(lport->host) = lport->mfs;
1586 fc_host_supported_speeds(lport->host) = 0;
1587 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
1588 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
1589 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
1590 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
1591
1592 return 0;
1593}
1594EXPORT_SYMBOL(fc_lport_init);