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35#include <linux/timer.h>
36#include <linux/slab.h>
37#include <linux/err.h>
38#include <asm/unaligned.h>
39
40#include <scsi/fc/fc_gs.h>
41
42#include <scsi/libfc.h>
43
44#include "fc_libfc.h"
45
46#define FC_DISC_RETRY_LIMIT 3
47#define FC_DISC_RETRY_DELAY 500UL
48
49static void fc_disc_gpn_ft_req(struct fc_disc *);
50static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
51static void fc_disc_done(struct fc_disc *, enum fc_disc_event);
52static void fc_disc_timeout(struct work_struct *);
53static int fc_disc_single(struct fc_lport *, struct fc_disc_port *);
54static void fc_disc_restart(struct fc_disc *);
55
56
57
58
59
60
61
62
63void fc_disc_stop_rports(struct fc_disc *disc)
64{
65 struct fc_lport *lport;
66 struct fc_rport_priv *rdata;
67
68 lport = fc_disc_lport(disc);
69
70 mutex_lock(&disc->disc_mutex);
71 list_for_each_entry_rcu(rdata, &disc->rports, peers)
72 lport->tt.rport_logoff(rdata);
73 mutex_unlock(&disc->disc_mutex);
74}
75
76
77
78
79
80
81
82
83
84static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp)
85{
86 struct fc_lport *lport;
87 struct fc_els_rscn *rp;
88 struct fc_els_rscn_page *pp;
89 struct fc_seq_els_data rjt_data;
90 unsigned int len;
91 int redisc = 0;
92 enum fc_els_rscn_ev_qual ev_qual;
93 enum fc_els_rscn_addr_fmt fmt;
94 LIST_HEAD(disc_ports);
95 struct fc_disc_port *dp, *next;
96
97 lport = fc_disc_lport(disc);
98
99 FC_DISC_DBG(disc, "Received an RSCN event\n");
100
101
102 rp = fc_frame_payload_get(fp, sizeof(*rp));
103 if (!rp)
104 goto reject;
105
106 if (rp->rscn_page_len != sizeof(*pp))
107 goto reject;
108
109 len = ntohs(rp->rscn_plen);
110 if (len < sizeof(*rp))
111 goto reject;
112
113 rp = fc_frame_payload_get(fp, len);
114 if (!rp)
115 goto reject;
116
117 len -= sizeof(*rp);
118 if (len % sizeof(*pp))
119 goto reject;
120
121 for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) {
122 ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT;
123 ev_qual &= ELS_RSCN_EV_QUAL_MASK;
124 fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT;
125 fmt &= ELS_RSCN_ADDR_FMT_MASK;
126
127
128
129
130 switch (fmt) {
131 case ELS_ADDR_FMT_PORT:
132 FC_DISC_DBG(disc, "Port address format for port "
133 "(%6.6x)\n", ntoh24(pp->rscn_fid));
134 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
135 if (!dp) {
136 redisc = 1;
137 break;
138 }
139 dp->lp = lport;
140 dp->port_id = ntoh24(pp->rscn_fid);
141 list_add_tail(&dp->peers, &disc_ports);
142 break;
143 case ELS_ADDR_FMT_AREA:
144 case ELS_ADDR_FMT_DOM:
145 case ELS_ADDR_FMT_FAB:
146 default:
147 FC_DISC_DBG(disc, "Address format is (%d)\n", fmt);
148 redisc = 1;
149 break;
150 }
151 }
152 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
153
154
155
156
157
158
159
160 list_for_each_entry_safe(dp, next, &disc_ports, peers) {
161 list_del(&dp->peers);
162 if (!redisc)
163 redisc = fc_disc_single(lport, dp);
164 kfree(dp);
165 }
166 if (redisc) {
167 FC_DISC_DBG(disc, "RSCN received: rediscovering\n");
168 fc_disc_restart(disc);
169 } else {
170 FC_DISC_DBG(disc, "RSCN received: not rediscovering. "
171 "redisc %d state %d in_prog %d\n",
172 redisc, lport->state, disc->pending);
173 }
174 fc_frame_free(fp);
175 return;
176reject:
177 FC_DISC_DBG(disc, "Received a bad RSCN frame\n");
178 rjt_data.reason = ELS_RJT_LOGIC;
179 rjt_data.explan = ELS_EXPL_NONE;
180 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
181 fc_frame_free(fp);
182}
183
184
185
186
187
188
189
190
191
192
193static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp)
194{
195 u8 op;
196 struct fc_disc *disc = &lport->disc;
197
198 op = fc_frame_payload_op(fp);
199 switch (op) {
200 case ELS_RSCN:
201 mutex_lock(&disc->disc_mutex);
202 fc_disc_recv_rscn_req(disc, fp);
203 mutex_unlock(&disc->disc_mutex);
204 break;
205 default:
206 FC_DISC_DBG(disc, "Received an unsupported request, "
207 "the opcode is (%x)\n", op);
208 break;
209 }
210}
211
212
213
214
215
216
217
218
219static void fc_disc_restart(struct fc_disc *disc)
220{
221 if (!disc->disc_callback)
222 return;
223
224 FC_DISC_DBG(disc, "Restarting discovery\n");
225
226 disc->requested = 1;
227 if (disc->pending)
228 return;
229
230
231
232
233
234
235 disc->disc_id = (disc->disc_id + 2) | 1;
236 disc->retry_count = 0;
237 fc_disc_gpn_ft_req(disc);
238}
239
240
241
242
243
244
245static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
246 enum fc_disc_event),
247 struct fc_lport *lport)
248{
249 struct fc_disc *disc = &lport->disc;
250
251
252
253
254
255
256 mutex_lock(&disc->disc_mutex);
257 disc->disc_callback = disc_callback;
258 fc_disc_restart(disc);
259 mutex_unlock(&disc->disc_mutex);
260}
261
262
263
264
265
266
267
268
269
270
271static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
272{
273 struct fc_lport *lport = fc_disc_lport(disc);
274 struct fc_rport_priv *rdata;
275
276 FC_DISC_DBG(disc, "Discovery complete\n");
277
278 disc->pending = 0;
279 if (disc->requested) {
280 fc_disc_restart(disc);
281 return;
282 }
283
284
285
286
287
288
289
290 list_for_each_entry_rcu(rdata, &disc->rports, peers) {
291 if (!rdata->disc_id)
292 continue;
293 if (rdata->disc_id == disc->disc_id)
294 lport->tt.rport_login(rdata);
295 else
296 lport->tt.rport_logoff(rdata);
297 }
298
299 mutex_unlock(&disc->disc_mutex);
300 disc->disc_callback(lport, event);
301 mutex_lock(&disc->disc_mutex);
302}
303
304
305
306
307
308
309static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
310{
311 struct fc_lport *lport = fc_disc_lport(disc);
312 unsigned long delay = 0;
313
314 FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n",
315 PTR_ERR(fp), disc->retry_count,
316 FC_DISC_RETRY_LIMIT);
317
318 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
319
320
321
322
323 if (disc->retry_count < FC_DISC_RETRY_LIMIT) {
324
325 if (!fp)
326 delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY);
327 else {
328 delay = msecs_to_jiffies(lport->e_d_tov);
329
330
331 if (!disc->retry_count)
332 delay /= 4;
333 }
334 disc->retry_count++;
335 schedule_delayed_work(&disc->disc_work, delay);
336 } else
337 fc_disc_done(disc, DISC_EV_FAILED);
338 }
339}
340
341
342
343
344
345
346
347
348static void fc_disc_gpn_ft_req(struct fc_disc *disc)
349{
350 struct fc_frame *fp;
351 struct fc_lport *lport = fc_disc_lport(disc);
352
353 WARN_ON(!fc_lport_test_ready(lport));
354
355 disc->pending = 1;
356 disc->requested = 0;
357
358 disc->buf_len = 0;
359 disc->seq_count = 0;
360 fp = fc_frame_alloc(lport,
361 sizeof(struct fc_ct_hdr) +
362 sizeof(struct fc_ns_gid_ft));
363 if (!fp)
364 goto err;
365
366 if (lport->tt.elsct_send(lport, 0, fp,
367 FC_NS_GPN_FT,
368 fc_disc_gpn_ft_resp,
369 disc, 3 * lport->r_a_tov))
370 return;
371err:
372 fc_disc_error(disc, NULL);
373}
374
375
376
377
378
379
380
381
382
383static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
384{
385 struct fc_lport *lport;
386 struct fc_gpn_ft_resp *np;
387 char *bp;
388 size_t plen;
389 size_t tlen;
390 int error = 0;
391 struct fc_rport_identifiers ids;
392 struct fc_rport_priv *rdata;
393
394 lport = fc_disc_lport(disc);
395 disc->seq_count++;
396
397
398
399
400 bp = buf;
401 plen = len;
402 np = (struct fc_gpn_ft_resp *)bp;
403 tlen = disc->buf_len;
404 disc->buf_len = 0;
405 if (tlen) {
406 WARN_ON(tlen >= sizeof(*np));
407 plen = sizeof(*np) - tlen;
408 WARN_ON(plen <= 0);
409 WARN_ON(plen >= sizeof(*np));
410 if (plen > len)
411 plen = len;
412 np = &disc->partial_buf;
413 memcpy((char *)np + tlen, bp, plen);
414
415
416
417
418
419 bp -= tlen;
420 len += tlen;
421 plen += tlen;
422 disc->buf_len = (unsigned char) plen;
423 if (plen == sizeof(*np))
424 disc->buf_len = 0;
425 }
426
427
428
429
430
431
432
433
434 while (plen >= sizeof(*np)) {
435 ids.port_id = ntoh24(np->fp_fid);
436 ids.port_name = ntohll(np->fp_wwpn);
437
438 if (ids.port_id != lport->port_id &&
439 ids.port_name != lport->wwpn) {
440 rdata = lport->tt.rport_create(lport, ids.port_id);
441 if (rdata) {
442 rdata->ids.port_name = ids.port_name;
443 rdata->disc_id = disc->disc_id;
444 } else {
445 printk(KERN_WARNING "libfc: Failed to allocate "
446 "memory for the newly discovered port "
447 "(%6.6x)\n", ids.port_id);
448 error = -ENOMEM;
449 }
450 }
451
452 if (np->fp_flags & FC_NS_FID_LAST) {
453 fc_disc_done(disc, DISC_EV_SUCCESS);
454 len = 0;
455 break;
456 }
457 len -= sizeof(*np);
458 bp += sizeof(*np);
459 np = (struct fc_gpn_ft_resp *)bp;
460 plen = len;
461 }
462
463
464
465
466 if (error == 0 && len > 0 && len < sizeof(*np)) {
467 if (np != &disc->partial_buf) {
468 FC_DISC_DBG(disc, "Partial buffer remains "
469 "for discovery\n");
470 memcpy(&disc->partial_buf, np, len);
471 }
472 disc->buf_len = (unsigned char) len;
473 }
474 return error;
475}
476
477
478
479
480
481static void fc_disc_timeout(struct work_struct *work)
482{
483 struct fc_disc *disc = container_of(work,
484 struct fc_disc,
485 disc_work.work);
486 mutex_lock(&disc->disc_mutex);
487 fc_disc_gpn_ft_req(disc);
488 mutex_unlock(&disc->disc_mutex);
489}
490
491
492
493
494
495
496
497
498
499
500static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
501 void *disc_arg)
502{
503 struct fc_disc *disc = disc_arg;
504 struct fc_ct_hdr *cp;
505 struct fc_frame_header *fh;
506 enum fc_disc_event event = DISC_EV_NONE;
507 unsigned int seq_cnt;
508 unsigned int len;
509 int error = 0;
510
511 mutex_lock(&disc->disc_mutex);
512 FC_DISC_DBG(disc, "Received a GPN_FT response\n");
513
514 if (IS_ERR(fp)) {
515 fc_disc_error(disc, fp);
516 mutex_unlock(&disc->disc_mutex);
517 return;
518 }
519
520 WARN_ON(!fc_frame_is_linear(fp));
521 fh = fc_frame_header_get(fp);
522 len = fr_len(fp) - sizeof(*fh);
523 seq_cnt = ntohs(fh->fh_seq_cnt);
524 if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) {
525 cp = fc_frame_payload_get(fp, sizeof(*cp));
526 if (!cp) {
527 FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n",
528 fr_len(fp));
529 event = DISC_EV_FAILED;
530 } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
531
532
533 len -= sizeof(*cp);
534 error = fc_disc_gpn_ft_parse(disc, cp + 1, len);
535 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
536 FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x "
537 "(check zoning)\n", cp->ct_reason,
538 cp->ct_explan);
539 event = DISC_EV_FAILED;
540 if (cp->ct_reason == FC_FS_RJT_UNABL &&
541 cp->ct_explan == FC_FS_EXP_FTNR)
542 event = DISC_EV_SUCCESS;
543 } else {
544 FC_DISC_DBG(disc, "GPN_FT unexpected response code "
545 "%x\n", ntohs(cp->ct_cmd));
546 event = DISC_EV_FAILED;
547 }
548 } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) {
549 error = fc_disc_gpn_ft_parse(disc, fh + 1, len);
550 } else {
551 FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? "
552 "seq_cnt %x expected %x sof %x eof %x\n",
553 seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp));
554 event = DISC_EV_FAILED;
555 }
556 if (error)
557 fc_disc_error(disc, fp);
558 else if (event != DISC_EV_NONE)
559 fc_disc_done(disc, event);
560 fc_frame_free(fp);
561 mutex_unlock(&disc->disc_mutex);
562}
563
564
565
566
567
568
569
570
571
572static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
573 void *rdata_arg)
574{
575 struct fc_rport_priv *rdata = rdata_arg;
576 struct fc_rport_priv *new_rdata;
577 struct fc_lport *lport;
578 struct fc_disc *disc;
579 struct fc_ct_hdr *cp;
580 struct fc_ns_gid_pn *pn;
581 u64 port_name;
582
583 lport = rdata->local_port;
584 disc = &lport->disc;
585
586 mutex_lock(&disc->disc_mutex);
587 if (PTR_ERR(fp) == -FC_EX_CLOSED)
588 goto out;
589 if (IS_ERR(fp))
590 goto redisc;
591
592 cp = fc_frame_payload_get(fp, sizeof(*cp));
593 if (!cp)
594 goto redisc;
595 if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
596 if (fr_len(fp) < sizeof(struct fc_frame_header) +
597 sizeof(*cp) + sizeof(*pn))
598 goto redisc;
599 pn = (struct fc_ns_gid_pn *)(cp + 1);
600 port_name = get_unaligned_be64(&pn->fn_wwpn);
601 if (rdata->ids.port_name == -1)
602 rdata->ids.port_name = port_name;
603 else if (rdata->ids.port_name != port_name) {
604 FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. "
605 "Port-id %6.6x wwpn %16.16llx\n",
606 rdata->ids.port_id, port_name);
607 lport->tt.rport_logoff(rdata);
608
609 new_rdata = lport->tt.rport_create(lport,
610 rdata->ids.port_id);
611 if (new_rdata) {
612 new_rdata->disc_id = disc->disc_id;
613 lport->tt.rport_login(new_rdata);
614 }
615 goto out;
616 }
617 rdata->disc_id = disc->disc_id;
618 lport->tt.rport_login(rdata);
619 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
620 FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n",
621 cp->ct_reason, cp->ct_explan);
622 lport->tt.rport_logoff(rdata);
623 } else {
624 FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n",
625 ntohs(cp->ct_cmd));
626redisc:
627 fc_disc_restart(disc);
628 }
629out:
630 mutex_unlock(&disc->disc_mutex);
631 kref_put(&rdata->kref, lport->tt.rport_destroy);
632}
633
634
635
636
637
638
639
640
641
642
643static int fc_disc_gpn_id_req(struct fc_lport *lport,
644 struct fc_rport_priv *rdata)
645{
646 struct fc_frame *fp;
647
648 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
649 sizeof(struct fc_ns_fid));
650 if (!fp)
651 return -ENOMEM;
652 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID,
653 fc_disc_gpn_id_resp, rdata,
654 3 * lport->r_a_tov))
655 return -ENOMEM;
656 kref_get(&rdata->kref);
657 return 0;
658}
659
660
661
662
663
664
665
666
667
668static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)
669{
670 struct fc_rport_priv *rdata;
671
672 rdata = lport->tt.rport_create(lport, dp->port_id);
673 if (!rdata)
674 return -ENOMEM;
675 rdata->disc_id = 0;
676 return fc_disc_gpn_id_req(lport, rdata);
677}
678
679
680
681
682
683void fc_disc_stop(struct fc_lport *lport)
684{
685 struct fc_disc *disc = &lport->disc;
686
687 if (disc->pending)
688 cancel_delayed_work_sync(&disc->disc_work);
689 fc_disc_stop_rports(disc);
690}
691
692
693
694
695
696
697
698
699void fc_disc_stop_final(struct fc_lport *lport)
700{
701 fc_disc_stop(lport);
702 lport->tt.rport_flush_queue();
703}
704
705
706
707
708
709int fc_disc_init(struct fc_lport *lport)
710{
711 struct fc_disc *disc;
712
713 if (!lport->tt.disc_start)
714 lport->tt.disc_start = fc_disc_start;
715
716 if (!lport->tt.disc_stop)
717 lport->tt.disc_stop = fc_disc_stop;
718
719 if (!lport->tt.disc_stop_final)
720 lport->tt.disc_stop_final = fc_disc_stop_final;
721
722 if (!lport->tt.disc_recv_req)
723 lport->tt.disc_recv_req = fc_disc_recv_req;
724
725 disc = &lport->disc;
726 INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
727 mutex_init(&disc->disc_mutex);
728 INIT_LIST_HEAD(&disc->rports);
729
730 disc->priv = lport;
731
732 return 0;
733}
734EXPORT_SYMBOL(fc_disc_init);
735