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fc_lport.c
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1 /*
2  * Copyright(c) 2007 Intel Corporation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16  *
17  * Maintained at www.Open-FCoE.org
18  */
19 
20 /*
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  * HIERARCHY
36  *
37  * The following hierarchy 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 hierarchy-
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 because 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, successful 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 <linux/delay.h>
92 #include <linux/module.h>
93 #include <linux/slab.h>
94 #include <asm/unaligned.h>
95 
96 #include <scsi/fc/fc_gs.h>
97 
98 #include <scsi/libfc.h>
99 #include <scsi/fc_encode.h>
100 #include <linux/scatterlist.h>
101 
102 #include "fc_libfc.h"
103 
104 /* Fabric IDs to use for point-to-point mode, chosen on whims. */
105 #define FC_LOCAL_PTP_FID_LO 0x010101
106 #define FC_LOCAL_PTP_FID_HI 0x010102
107 
108 #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
109 
110 static void fc_lport_error(struct fc_lport *, struct fc_frame *);
111 
112 static void fc_lport_enter_reset(struct fc_lport *);
113 static void fc_lport_enter_flogi(struct fc_lport *);
114 static void fc_lport_enter_dns(struct fc_lport *);
115 static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state);
116 static void fc_lport_enter_scr(struct fc_lport *);
117 static void fc_lport_enter_ready(struct fc_lport *);
118 static void fc_lport_enter_logo(struct fc_lport *);
119 static void fc_lport_enter_fdmi(struct fc_lport *lport);
120 static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);
121 
122 static const char *fc_lport_state_names[] = {
123  [LPORT_ST_DISABLED] = "disabled",
124  [LPORT_ST_FLOGI] = "FLOGI",
125  [LPORT_ST_DNS] = "dNS",
126  [LPORT_ST_RNN_ID] = "RNN_ID",
127  [LPORT_ST_RSNN_NN] = "RSNN_NN",
128  [LPORT_ST_RSPN_ID] = "RSPN_ID",
129  [LPORT_ST_RFT_ID] = "RFT_ID",
130  [LPORT_ST_RFF_ID] = "RFF_ID",
131  [LPORT_ST_FDMI] = "FDMI",
132  [LPORT_ST_RHBA] = "RHBA",
133  [LPORT_ST_RPA] = "RPA",
134  [LPORT_ST_DHBA] = "DHBA",
135  [LPORT_ST_DPRT] = "DPRT",
136  [LPORT_ST_SCR] = "SCR",
137  [LPORT_ST_READY] = "Ready",
138  [LPORT_ST_LOGO] = "LOGO",
139  [LPORT_ST_RESET] = "reset",
140 };
141 
151 struct fc_bsg_info {
152  struct fc_bsg_job *job;
153  struct fc_lport *lport;
155  struct scatterlist *sg;
157  size_t offset;
158 };
159 
165 static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
166 {
167  fc_frame_free(fp);
168  return 0;
169 }
170 
180 static void fc_lport_rport_callback(struct fc_lport *lport,
181  struct fc_rport_priv *rdata,
182  enum fc_rport_event event)
183 {
184  FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event,
185  rdata->ids.port_id);
186 
187  mutex_lock(&lport->lp_mutex);
188  switch (event) {
189  case RPORT_EV_READY:
190  if (lport->state == LPORT_ST_DNS) {
191  lport->dns_rdata = rdata;
192  fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
193  } else if (lport->state == LPORT_ST_FDMI) {
194  lport->ms_rdata = rdata;
195  fc_lport_enter_ms(lport, LPORT_ST_DHBA);
196  } else {
197  FC_LPORT_DBG(lport, "Received an READY event "
198  "on port (%6.6x) for the directory "
199  "server, but the lport is not "
200  "in the DNS or FDMI state, it's in the "
201  "%d state", rdata->ids.port_id,
202  lport->state);
203  lport->tt.rport_logoff(rdata);
204  }
205  break;
206  case RPORT_EV_LOGO:
207  case RPORT_EV_FAILED:
208  case RPORT_EV_STOP:
209  if (rdata->ids.port_id == FC_FID_DIR_SERV)
210  lport->dns_rdata = NULL;
211  else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
212  lport->ms_rdata = NULL;
213  break;
214  case RPORT_EV_NONE:
215  break;
216  }
217  mutex_unlock(&lport->lp_mutex);
218 }
219 
224 static const char *fc_lport_state(struct fc_lport *lport)
225 {
226  const char *cp;
227 
228  cp = fc_lport_state_names[lport->state];
229  if (!cp)
230  cp = "unknown";
231  return cp;
232 }
233 
241 static void fc_lport_ptp_setup(struct fc_lport *lport,
242  u32 remote_fid, u64 remote_wwpn,
243  u64 remote_wwnn)
244 {
245  mutex_lock(&lport->disc.disc_mutex);
246  if (lport->ptp_rdata) {
247  lport->tt.rport_logoff(lport->ptp_rdata);
248  kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
249  }
250  lport->ptp_rdata = lport->tt.rport_create(lport, remote_fid);
251  kref_get(&lport->ptp_rdata->kref);
252  lport->ptp_rdata->ids.port_name = remote_wwpn;
253  lport->ptp_rdata->ids.node_name = remote_wwnn;
254  mutex_unlock(&lport->disc.disc_mutex);
255 
256  lport->tt.rport_login(lport->ptp_rdata);
257 
258  fc_lport_enter_ready(lport);
259 }
260 
266 {
267  struct fc_lport *lport = shost_priv(shost);
268 
269  mutex_lock(&lport->lp_mutex);
270  if (!lport->link_up)
272  else
273  switch (lport->state) {
274  case LPORT_ST_READY:
276  break;
277  default:
279  }
280  mutex_unlock(&lport->lp_mutex);
281 }
283 
289 {
290  struct fc_lport *lport = shost_priv(shost);
291 
292  fc_host_speed(shost) = lport->link_speed;
293 }
295 
301 {
303  struct fc_lport *lport = shost_priv(shost);
304  struct timespec v0, v1;
305  unsigned int cpu;
306  u64 fcp_in_bytes = 0;
307  u64 fcp_out_bytes = 0;
308 
309  fc_stats = &lport->host_stats;
310  memset(fc_stats, 0, sizeof(struct fc_host_statistics));
311 
313  jiffies_to_timespec(lport->boot_time, &v1);
314  fc_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
315 
316  for_each_possible_cpu(cpu) {
317  struct fc_stats *stats;
318 
319  stats = per_cpu_ptr(lport->stats, cpu);
320 
321  fc_stats->tx_frames += stats->TxFrames;
322  fc_stats->tx_words += stats->TxWords;
323  fc_stats->rx_frames += stats->RxFrames;
324  fc_stats->rx_words += stats->RxWords;
325  fc_stats->error_frames += stats->ErrorFrames;
326  fc_stats->invalid_crc_count += stats->InvalidCRCCount;
327  fc_stats->fcp_input_requests += stats->InputRequests;
328  fc_stats->fcp_output_requests += stats->OutputRequests;
329  fc_stats->fcp_control_requests += stats->ControlRequests;
330  fcp_in_bytes += stats->InputBytes;
331  fcp_out_bytes += stats->OutputBytes;
332  fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails;
333  fc_stats->fcp_packet_aborts += stats->FcpPktAborts;
334  fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails;
335  fc_stats->link_failure_count += stats->LinkFailureCount;
336  }
337  fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
338  fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
339  fc_stats->lip_count = -1;
340  fc_stats->nos_count = -1;
341  fc_stats->loss_of_sync_count = -1;
342  fc_stats->loss_of_signal_count = -1;
343  fc_stats->prim_seq_protocol_err_count = -1;
344  fc_stats->dumped_frames = -1;
345 
346  /* update exches stats */
347  fc_exch_update_stats(lport);
348 
349  return fc_stats;
350 }
352 
359 static void fc_lport_flogi_fill(struct fc_lport *lport,
360  struct fc_els_flogi *flogi,
361  unsigned int op)
362 {
363  struct fc_els_csp *sp;
364  struct fc_els_cssp *cp;
365 
366  memset(flogi, 0, sizeof(*flogi));
367  flogi->fl_cmd = (u8) op;
368  put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
369  put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
370  sp = &flogi->fl_csp;
371  sp->sp_hi_ver = 0x20;
372  sp->sp_lo_ver = 0x20;
373  sp->sp_bb_cred = htons(10); /* this gets set by gateway */
374  sp->sp_bb_data = htons((u16) lport->mfs);
375  cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
377  if (op != ELS_FLOGI) {
379  sp->sp_tot_seq = htons(255); /* seq. we accept */
380  sp->sp_rel_off = htons(0x1f);
381  sp->sp_e_d_tov = htonl(lport->e_d_tov);
382 
383  cp->cp_rdfs = htons((u16) lport->mfs);
384  cp->cp_con_seq = htons(255);
385  cp->cp_open_seq = 1;
386  }
387 }
388 
394 static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
395 {
396  __be32 *mp;
397 
398  mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
399  *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
400 }
401 
410 static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
411 {
412  FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
413  fc_lport_state(lport));
414 
415  lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
416  fc_frame_free(fp);
417 }
418 
427 static void fc_lport_recv_echo_req(struct fc_lport *lport,
428  struct fc_frame *in_fp)
429 {
430  struct fc_frame *fp;
431  unsigned int len;
432  void *pp;
433  void *dp;
434 
435  FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
436  fc_lport_state(lport));
437 
438  len = fr_len(in_fp) - sizeof(struct fc_frame_header);
439  pp = fc_frame_payload_get(in_fp, len);
440 
441  if (len < sizeof(__be32))
442  len = sizeof(__be32);
443 
444  fp = fc_frame_alloc(lport, len);
445  if (fp) {
446  dp = fc_frame_payload_get(fp, len);
447  memcpy(dp, pp, len);
448  *((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
449  fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
450  lport->tt.frame_send(lport, fp);
451  }
452  fc_frame_free(in_fp);
453 }
454 
463 static void fc_lport_recv_rnid_req(struct fc_lport *lport,
464  struct fc_frame *in_fp)
465 {
466  struct fc_frame *fp;
467  struct fc_els_rnid *req;
468  struct {
469  struct fc_els_rnid_resp rnid;
470  struct fc_els_rnid_cid cid;
471  struct fc_els_rnid_gen gen;
472  } *rp;
473  struct fc_seq_els_data rjt_data;
474  u8 fmt;
475  size_t len;
476 
477  FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
478  fc_lport_state(lport));
479 
480  req = fc_frame_payload_get(in_fp, sizeof(*req));
481  if (!req) {
482  rjt_data.reason = ELS_RJT_LOGIC;
483  rjt_data.explan = ELS_EXPL_NONE;
484  lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
485  } else {
486  fmt = req->rnid_fmt;
487  len = sizeof(*rp);
488  if (fmt != ELS_RNIDF_GEN ||
489  ntohl(lport->rnid_gen.rnid_atype) == 0) {
490  fmt = ELS_RNIDF_NONE; /* nothing to provide */
491  len -= sizeof(rp->gen);
492  }
493  fp = fc_frame_alloc(lport, len);
494  if (fp) {
495  rp = fc_frame_payload_get(fp, len);
496  memset(rp, 0, len);
497  rp->rnid.rnid_cmd = ELS_LS_ACC;
498  rp->rnid.rnid_fmt = fmt;
499  rp->rnid.rnid_cid_len = sizeof(rp->cid);
500  rp->cid.rnid_wwpn = htonll(lport->wwpn);
501  rp->cid.rnid_wwnn = htonll(lport->wwnn);
502  if (fmt == ELS_RNIDF_GEN) {
503  rp->rnid.rnid_sid_len = sizeof(rp->gen);
504  memcpy(&rp->gen, &lport->rnid_gen,
505  sizeof(rp->gen));
506  }
507  fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
508  lport->tt.frame_send(lport, fp);
509  }
510  }
511  fc_frame_free(in_fp);
512 }
513 
522 static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
523 {
524  lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
525  fc_lport_enter_reset(lport);
526  fc_frame_free(fp);
527 }
528 
536 int fc_fabric_login(struct fc_lport *lport)
537 {
538  int rc = -1;
539 
540  mutex_lock(&lport->lp_mutex);
541  if (lport->state == LPORT_ST_DISABLED ||
542  lport->state == LPORT_ST_LOGO) {
543  fc_lport_state_enter(lport, LPORT_ST_RESET);
544  fc_lport_enter_reset(lport);
545  rc = 0;
546  }
547  mutex_unlock(&lport->lp_mutex);
548 
549  return rc;
550 }
552 
559 void __fc_linkup(struct fc_lport *lport)
560 {
561  if (!lport->link_up) {
562  lport->link_up = 1;
563 
564  if (lport->state == LPORT_ST_RESET)
565  fc_lport_enter_flogi(lport);
566  }
567 }
568 
573 void fc_linkup(struct fc_lport *lport)
574 {
575  printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
576  lport->host->host_no, lport->port_id);
577 
578  mutex_lock(&lport->lp_mutex);
579  __fc_linkup(lport);
580  mutex_unlock(&lport->lp_mutex);
581 }
583 
590 void __fc_linkdown(struct fc_lport *lport)
591 {
592  if (lport->link_up) {
593  lport->link_up = 0;
594  fc_lport_enter_reset(lport);
595  lport->tt.fcp_cleanup(lport);
596  }
597 }
598 
603 void fc_linkdown(struct fc_lport *lport)
604 {
605  printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
606  lport->host->host_no, lport->port_id);
607 
608  mutex_lock(&lport->lp_mutex);
609  __fc_linkdown(lport);
610  mutex_unlock(&lport->lp_mutex);
611 }
613 
621 int fc_fabric_logoff(struct fc_lport *lport)
622 {
623  lport->tt.disc_stop_final(lport);
624  mutex_lock(&lport->lp_mutex);
625  if (lport->dns_rdata)
626  lport->tt.rport_logoff(lport->dns_rdata);
627  mutex_unlock(&lport->lp_mutex);
628  lport->tt.rport_flush_queue();
629  mutex_lock(&lport->lp_mutex);
630  fc_lport_enter_logo(lport);
631  mutex_unlock(&lport->lp_mutex);
633  return 0;
634 }
636 
647 int fc_lport_destroy(struct fc_lport *lport)
648 {
649  mutex_lock(&lport->lp_mutex);
650  lport->state = LPORT_ST_DISABLED;
651  lport->link_up = 0;
652  lport->tt.frame_send = fc_frame_drop;
653  mutex_unlock(&lport->lp_mutex);
654 
655  lport->tt.fcp_abort_io(lport);
656  lport->tt.disc_stop_final(lport);
657  lport->tt.exch_mgr_reset(lport, 0, 0);
659  fc_fc4_del_lport(lport);
660  return 0;
661 }
663 
669 int fc_set_mfs(struct fc_lport *lport, u32 mfs)
670 {
671  unsigned int old_mfs;
672  int rc = -EINVAL;
673 
674  mutex_lock(&lport->lp_mutex);
675 
676  old_mfs = lport->mfs;
677 
678  if (mfs >= FC_MIN_MAX_FRAME) {
679  mfs &= ~3;
680  if (mfs > FC_MAX_FRAME)
681  mfs = FC_MAX_FRAME;
682  mfs -= sizeof(struct fc_frame_header);
683  lport->mfs = mfs;
684  rc = 0;
685  }
686 
687  if (!rc && mfs < old_mfs)
688  fc_lport_enter_reset(lport);
689 
690  mutex_unlock(&lport->lp_mutex);
691 
692  return rc;
693 }
695 
701 static void fc_lport_disc_callback(struct fc_lport *lport,
702  enum fc_disc_event event)
703 {
704  switch (event) {
705  case DISC_EV_SUCCESS:
706  FC_LPORT_DBG(lport, "Discovery succeeded\n");
707  break;
708  case DISC_EV_FAILED:
709  printk(KERN_ERR "host%d: libfc: "
710  "Discovery failed for port (%6.6x)\n",
711  lport->host->host_no, lport->port_id);
712  mutex_lock(&lport->lp_mutex);
713  fc_lport_enter_reset(lport);
714  mutex_unlock(&lport->lp_mutex);
715  break;
716  case DISC_EV_NONE:
717  WARN_ON(1);
718  break;
719  }
720 }
721 
729 static void fc_lport_enter_ready(struct fc_lport *lport)
730 {
731  FC_LPORT_DBG(lport, "Entered READY from state %s\n",
732  fc_lport_state(lport));
733 
734  fc_lport_state_enter(lport, LPORT_ST_READY);
735  if (lport->vport)
736  fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
737  fc_vports_linkchange(lport);
738 
739  if (!lport->ptp_rdata)
740  lport->tt.disc_start(fc_lport_disc_callback, lport);
741 }
742 
752 static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
753  struct fc_frame *fp)
754 {
755  if (port_id)
756  printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
757  lport->host->host_no, port_id);
758 
759  lport->port_id = port_id;
760 
761  /* Update the fc_host */
762  fc_host_port_id(lport->host) = port_id;
763 
764  if (lport->tt.lport_set_port_id)
765  lport->tt.lport_set_port_id(lport, port_id, fp);
766 }
767 
777 void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
778 {
779  mutex_lock(&lport->lp_mutex);
780 
781  fc_lport_set_port_id(lport, port_id, NULL);
782 
783  switch (lport->state) {
784  case LPORT_ST_RESET:
785  case LPORT_ST_FLOGI:
786  if (port_id)
787  fc_lport_enter_ready(lport);
788  break;
789  default:
790  break;
791  }
792  mutex_unlock(&lport->lp_mutex);
793 }
795 
808 static void fc_lport_recv_flogi_req(struct fc_lport *lport,
809  struct fc_frame *rx_fp)
810 {
811  struct fc_frame *fp;
812  struct fc_frame_header *fh;
813  struct fc_els_flogi *flp;
814  struct fc_els_flogi *new_flp;
815  u64 remote_wwpn;
816  u32 remote_fid;
817  u32 local_fid;
818 
819  FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
820  fc_lport_state(lport));
821 
822  remote_fid = fc_frame_sid(rx_fp);
823  flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
824  if (!flp)
825  goto out;
826  remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
827  if (remote_wwpn == lport->wwpn) {
828  printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
829  "with same WWPN %16.16llx\n",
830  lport->host->host_no, remote_wwpn);
831  goto out;
832  }
833  FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);
834 
835  /*
836  * XXX what is the right thing to do for FIDs?
837  * The originator might expect our S_ID to be 0xfffffe.
838  * But if so, both of us could end up with the same FID.
839  */
840  local_fid = FC_LOCAL_PTP_FID_LO;
841  if (remote_wwpn < lport->wwpn) {
842  local_fid = FC_LOCAL_PTP_FID_HI;
843  if (!remote_fid || remote_fid == local_fid)
844  remote_fid = FC_LOCAL_PTP_FID_LO;
845  } else if (!remote_fid) {
846  remote_fid = FC_LOCAL_PTP_FID_HI;
847  }
848 
849  fc_lport_set_port_id(lport, local_fid, rx_fp);
850 
851  fp = fc_frame_alloc(lport, sizeof(*flp));
852  if (fp) {
853  new_flp = fc_frame_payload_get(fp, sizeof(*flp));
854  fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
855  new_flp->fl_cmd = (u8) ELS_LS_ACC;
856 
857  /*
858  * Send the response. If this fails, the originator should
859  * repeat the sequence.
860  */
861  fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
862  fh = fc_frame_header_get(fp);
863  hton24(fh->fh_s_id, local_fid);
864  hton24(fh->fh_d_id, remote_fid);
865  lport->tt.frame_send(lport, fp);
866 
867  } else {
868  fc_lport_error(lport, fp);
869  }
870  fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
871  get_unaligned_be64(&flp->fl_wwnn));
872 out:
873  fc_frame_free(rx_fp);
874 }
875 
887 static void fc_lport_recv_els_req(struct fc_lport *lport,
888  struct fc_frame *fp)
889 {
890  void (*recv)(struct fc_lport *, struct fc_frame *);
891 
892  mutex_lock(&lport->lp_mutex);
893 
894  /*
895  * Handle special ELS cases like FLOGI, LOGO, and
896  * RSCN here. These don't require a session.
897  * Even if we had a session, it might not be ready.
898  */
899  if (!lport->link_up)
900  fc_frame_free(fp);
901  else {
902  /*
903  * Check opcode.
904  */
905  recv = lport->tt.rport_recv_req;
906  switch (fc_frame_payload_op(fp)) {
907  case ELS_FLOGI:
908  if (!lport->point_to_multipoint)
909  recv = fc_lport_recv_flogi_req;
910  break;
911  case ELS_LOGO:
912  if (fc_frame_sid(fp) == FC_FID_FLOGI)
913  recv = fc_lport_recv_logo_req;
914  break;
915  case ELS_RSCN:
916  recv = lport->tt.disc_recv_req;
917  break;
918  case ELS_ECHO:
919  recv = fc_lport_recv_echo_req;
920  break;
921  case ELS_RLIR:
922  recv = fc_lport_recv_rlir_req;
923  break;
924  case ELS_RNID:
925  recv = fc_lport_recv_rnid_req;
926  break;
927  }
928 
929  recv(lport, fp);
930  }
931  mutex_unlock(&lport->lp_mutex);
932 }
933 
934 static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
935  const struct fc_els_spp *spp_in,
936  struct fc_els_spp *spp_out)
937 {
938  return FC_SPP_RESP_INVL;
939 }
940 
942  .prli = fc_lport_els_prli,
943  .recv = fc_lport_recv_els_req,
944 };
945 
954 static void fc_lport_recv_req(struct fc_lport *lport,
955  struct fc_frame *fp)
956 {
957  struct fc_frame_header *fh = fc_frame_header_get(fp);
958  struct fc_seq *sp = fr_seq(fp);
959  struct fc4_prov *prov;
960 
961  /*
962  * Use RCU read lock and module_lock to be sure module doesn't
963  * deregister and get unloaded while we're calling it.
964  * try_module_get() is inlined and accepts a NULL parameter.
965  * Only ELSes and FCP target ops should come through here.
966  * The locking is unfortunate, and a better scheme is being sought.
967  */
968 
969  rcu_read_lock();
970  if (fh->fh_type >= FC_FC4_PROV_SIZE)
971  goto drop;
973  if (!prov || !try_module_get(prov->module))
974  goto drop;
975  rcu_read_unlock();
976  prov->recv(lport, fp);
977  module_put(prov->module);
978  return;
979 drop:
980  rcu_read_unlock();
981  FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
982  fc_frame_free(fp);
983  if (sp)
984  lport->tt.exch_done(sp);
985 }
986 
994 int fc_lport_reset(struct fc_lport *lport)
995 {
997  mutex_lock(&lport->lp_mutex);
998  fc_lport_enter_reset(lport);
999  mutex_unlock(&lport->lp_mutex);
1000  return 0;
1001 }
1003 
1011 static void fc_lport_reset_locked(struct fc_lport *lport)
1012 {
1013  if (lport->dns_rdata)
1014  lport->tt.rport_logoff(lport->dns_rdata);
1015 
1016  if (lport->ptp_rdata) {
1017  lport->tt.rport_logoff(lport->ptp_rdata);
1018  kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
1019  lport->ptp_rdata = NULL;
1020  }
1021 
1022  lport->tt.disc_stop(lport);
1023 
1024  lport->tt.exch_mgr_reset(lport, 0, 0);
1025  fc_host_fabric_name(lport->host) = 0;
1026 
1027  if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
1028  fc_lport_set_port_id(lport, 0, NULL);
1029 }
1030 
1038 static void fc_lport_enter_reset(struct fc_lport *lport)
1039 {
1040  FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
1041  fc_lport_state(lport));
1042 
1043  if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
1044  return;
1045 
1046  if (lport->vport) {
1047  if (lport->link_up)
1048  fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
1049  else
1050  fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
1051  }
1052  fc_lport_state_enter(lport, LPORT_ST_RESET);
1054  FCH_EVT_LIPRESET, 0);
1055  fc_vports_linkchange(lport);
1056  fc_lport_reset_locked(lport);
1057  if (lport->link_up)
1058  fc_lport_enter_flogi(lport);
1059 }
1060 
1068 static void fc_lport_enter_disabled(struct fc_lport *lport)
1069 {
1070  FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
1071  fc_lport_state(lport));
1072 
1073  fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1074  fc_vports_linkchange(lport);
1075  fc_lport_reset_locked(lport);
1076 }
1077 
1087 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
1088 {
1089  unsigned long delay = 0;
1090  FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
1091  PTR_ERR(fp), fc_lport_state(lport),
1092  lport->retry_count);
1093 
1094  if (PTR_ERR(fp) == -FC_EX_CLOSED)
1095  return;
1096 
1097  /*
1098  * Memory allocation failure, or the exchange timed out
1099  * or we received LS_RJT.
1100  * Retry after delay
1101  */
1102  if (lport->retry_count < lport->max_retry_count) {
1103  lport->retry_count++;
1104  if (!fp)
1105  delay = msecs_to_jiffies(500);
1106  else
1107  delay = msecs_to_jiffies(lport->e_d_tov);
1108 
1109  schedule_delayed_work(&lport->retry_work, delay);
1110  } else
1111  fc_lport_enter_reset(lport);
1112 }
1113 
1125 static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp,
1126  void *lp_arg)
1127 {
1128  struct fc_lport *lport = lp_arg;
1129  struct fc_frame_header *fh;
1130  struct fc_ct_hdr *ct;
1131 
1132  FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp));
1133 
1134  if (fp == ERR_PTR(-FC_EX_CLOSED))
1135  return;
1136 
1137  mutex_lock(&lport->lp_mutex);
1138 
1139  if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
1140  FC_LPORT_DBG(lport, "Received a name server response, "
1141  "but in state %s\n", fc_lport_state(lport));
1142  if (IS_ERR(fp))
1143  goto err;
1144  goto out;
1145  }
1146 
1147  if (IS_ERR(fp)) {
1148  fc_lport_error(lport, fp);
1149  goto err;
1150  }
1151 
1152  fh = fc_frame_header_get(fp);
1153  ct = fc_frame_payload_get(fp, sizeof(*ct));
1154 
1155  if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1156  ct->ct_fs_type == FC_FST_DIR &&
1157  ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1158  ntohs(ct->ct_cmd) == FC_FS_ACC)
1159  switch (lport->state) {
1160  case LPORT_ST_RNN_ID:
1161  fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
1162  break;
1163  case LPORT_ST_RSNN_NN:
1164  fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
1165  break;
1166  case LPORT_ST_RSPN_ID:
1167  fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1168  break;
1169  case LPORT_ST_RFT_ID:
1170  fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
1171  break;
1172  case LPORT_ST_RFF_ID:
1173  if (lport->fdmi_enabled)
1174  fc_lport_enter_fdmi(lport);
1175  else
1176  fc_lport_enter_scr(lport);
1177  break;
1178  default:
1179  /* should have already been caught by state checks */
1180  break;
1181  }
1182  else
1183  fc_lport_error(lport, fp);
1184 out:
1185  fc_frame_free(fp);
1186 err:
1187  mutex_unlock(&lport->lp_mutex);
1188 }
1189 
1201 static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp,
1202  void *lp_arg)
1203 {
1204  struct fc_lport *lport = lp_arg;
1205  struct fc_frame_header *fh;
1206  struct fc_ct_hdr *ct;
1207 
1208  FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp));
1209 
1210  if (fp == ERR_PTR(-FC_EX_CLOSED))
1211  return;
1212 
1213  mutex_lock(&lport->lp_mutex);
1214 
1215  if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) {
1216  FC_LPORT_DBG(lport, "Received a management server response, "
1217  "but in state %s\n", fc_lport_state(lport));
1218  if (IS_ERR(fp))
1219  goto err;
1220  goto out;
1221  }
1222 
1223  if (IS_ERR(fp)) {
1224  fc_lport_error(lport, fp);
1225  goto err;
1226  }
1227 
1228  fh = fc_frame_header_get(fp);
1229  ct = fc_frame_payload_get(fp, sizeof(*ct));
1230 
1231  if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1232  ct->ct_fs_type == FC_FST_MGMT &&
1233  ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
1234  FC_LPORT_DBG(lport, "Received a management server response, "
1235  "reason=%d explain=%d\n",
1236  ct->ct_reason,
1237  ct->ct_explan);
1238 
1239  switch (lport->state) {
1240  case LPORT_ST_RHBA:
1241  if (ntohs(ct->ct_cmd) == FC_FS_ACC)
1242  fc_lport_enter_ms(lport, LPORT_ST_RPA);
1243  else /* Error Skip RPA */
1244  fc_lport_enter_scr(lport);
1245  break;
1246  case LPORT_ST_RPA:
1247  fc_lport_enter_scr(lport);
1248  break;
1249  case LPORT_ST_DPRT:
1250  fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1251  break;
1252  case LPORT_ST_DHBA:
1253  fc_lport_enter_ms(lport, LPORT_ST_DPRT);
1254  break;
1255  default:
1256  /* should have already been caught by state checks */
1257  break;
1258  }
1259  } else {
1260  /* Invalid Frame? */
1261  fc_lport_error(lport, fp);
1262  }
1263 out:
1264  fc_frame_free(fp);
1265 err:
1266  mutex_unlock(&lport->lp_mutex);
1267 }
1268 
1279 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1280  void *lp_arg)
1281 {
1282  struct fc_lport *lport = lp_arg;
1283  u8 op;
1284 
1285  FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));
1286 
1287  if (fp == ERR_PTR(-FC_EX_CLOSED))
1288  return;
1289 
1290  mutex_lock(&lport->lp_mutex);
1291 
1292  if (lport->state != LPORT_ST_SCR) {
1293  FC_LPORT_DBG(lport, "Received a SCR response, but in state "
1294  "%s\n", fc_lport_state(lport));
1295  if (IS_ERR(fp))
1296  goto err;
1297  goto out;
1298  }
1299 
1300  if (IS_ERR(fp)) {
1301  fc_lport_error(lport, fp);
1302  goto err;
1303  }
1304 
1305  op = fc_frame_payload_op(fp);
1306  if (op == ELS_LS_ACC)
1307  fc_lport_enter_ready(lport);
1308  else
1309  fc_lport_error(lport, fp);
1310 
1311 out:
1312  fc_frame_free(fp);
1313 err:
1314  mutex_unlock(&lport->lp_mutex);
1315 }
1316 
1324 static void fc_lport_enter_scr(struct fc_lport *lport)
1325 {
1326  struct fc_frame *fp;
1327 
1328  FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
1329  fc_lport_state(lport));
1330 
1331  fc_lport_state_enter(lport, LPORT_ST_SCR);
1332 
1333  fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1334  if (!fp) {
1335  fc_lport_error(lport, fp);
1336  return;
1337  }
1338 
1339  if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
1340  fc_lport_scr_resp, lport,
1341  2 * lport->r_a_tov))
1342  fc_lport_error(lport, NULL);
1343 }
1344 
1352 static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
1353 {
1354  struct fc_frame *fp;
1355  enum fc_ns_req cmd;
1356  int size = sizeof(struct fc_ct_hdr);
1357  size_t len;
1358 
1359  FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1360  fc_lport_state_names[state],
1361  fc_lport_state(lport));
1362 
1363  fc_lport_state_enter(lport, state);
1364 
1365  switch (state) {
1366  case LPORT_ST_RNN_ID:
1367  cmd = FC_NS_RNN_ID;
1368  size += sizeof(struct fc_ns_rn_id);
1369  break;
1370  case LPORT_ST_RSNN_NN:
1371  len = strnlen(fc_host_symbolic_name(lport->host), 255);
1372  /* if there is no symbolic name, skip to RFT_ID */
1373  if (!len)
1374  return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1375  cmd = FC_NS_RSNN_NN;
1376  size += sizeof(struct fc_ns_rsnn) + len;
1377  break;
1378  case LPORT_ST_RSPN_ID:
1379  len = strnlen(fc_host_symbolic_name(lport->host), 255);
1380  /* if there is no symbolic name, skip to RFT_ID */
1381  if (!len)
1382  return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1383  cmd = FC_NS_RSPN_ID;
1384  size += sizeof(struct fc_ns_rspn) + len;
1385  break;
1386  case LPORT_ST_RFT_ID:
1387  cmd = FC_NS_RFT_ID;
1388  size += sizeof(struct fc_ns_rft);
1389  break;
1390  case LPORT_ST_RFF_ID:
1391  cmd = FC_NS_RFF_ID;
1392  size += sizeof(struct fc_ns_rff_id);
1393  break;
1394  default:
1395  fc_lport_error(lport, NULL);
1396  return;
1397  }
1398 
1399  fp = fc_frame_alloc(lport, size);
1400  if (!fp) {
1401  fc_lport_error(lport, fp);
1402  return;
1403  }
1404 
1405  if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
1406  fc_lport_ns_resp,
1407  lport, 3 * lport->r_a_tov))
1408  fc_lport_error(lport, fp);
1409 }
1410 
1411 static struct fc_rport_operations fc_lport_rport_ops = {
1412  .event_callback = fc_lport_rport_callback,
1413 };
1414 
1422 static void fc_lport_enter_dns(struct fc_lport *lport)
1423 {
1424  struct fc_rport_priv *rdata;
1425 
1426  FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
1427  fc_lport_state(lport));
1428 
1429  fc_lport_state_enter(lport, LPORT_ST_DNS);
1430 
1431  mutex_lock(&lport->disc.disc_mutex);
1432  rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV);
1433  mutex_unlock(&lport->disc.disc_mutex);
1434  if (!rdata)
1435  goto err;
1436 
1437  rdata->ops = &fc_lport_rport_ops;
1438  lport->tt.rport_login(rdata);
1439  return;
1440 
1441 err:
1442  fc_lport_error(lport, NULL);
1443 }
1444 
1452 static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
1453 {
1454  struct fc_frame *fp;
1455  enum fc_fdmi_req cmd;
1456  int size = sizeof(struct fc_ct_hdr);
1457  size_t len;
1458  int numattrs;
1459 
1460  FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1461  fc_lport_state_names[state],
1462  fc_lport_state(lport));
1463 
1464  fc_lport_state_enter(lport, state);
1465 
1466  switch (state) {
1467  case LPORT_ST_RHBA:
1468  cmd = FC_FDMI_RHBA;
1469  /* Number of HBA Attributes */
1470  numattrs = 10;
1471  len = sizeof(struct fc_fdmi_rhba);
1472  len -= sizeof(struct fc_fdmi_attr_entry);
1473  len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1484 
1485  size += len;
1486  break;
1487  case LPORT_ST_RPA:
1488  cmd = FC_FDMI_RPA;
1489  /* Number of Port Attributes */
1490  numattrs = 6;
1491  len = sizeof(struct fc_fdmi_rpa);
1492  len -= sizeof(struct fc_fdmi_attr_entry);
1493  len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1500 
1501  size += len;
1502  break;
1503  case LPORT_ST_DPRT:
1504  cmd = FC_FDMI_DPRT;
1505  len = sizeof(struct fc_fdmi_dprt);
1506  size += len;
1507  break;
1508  case LPORT_ST_DHBA:
1509  cmd = FC_FDMI_DHBA;
1510  len = sizeof(struct fc_fdmi_dhba);
1511  size += len;
1512  break;
1513  default:
1514  fc_lport_error(lport, NULL);
1515  return;
1516  }
1517 
1518  FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
1519  cmd, (int)len, size);
1520  fp = fc_frame_alloc(lport, size);
1521  if (!fp) {
1522  fc_lport_error(lport, fp);
1523  return;
1524  }
1525 
1526  if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
1527  fc_lport_ms_resp,
1528  lport, 3 * lport->r_a_tov))
1529  fc_lport_error(lport, fp);
1530 }
1531 
1539 static void fc_lport_enter_fdmi(struct fc_lport *lport)
1540 {
1541  struct fc_rport_priv *rdata;
1542 
1543  FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
1544  fc_lport_state(lport));
1545 
1546  fc_lport_state_enter(lport, LPORT_ST_FDMI);
1547 
1548  mutex_lock(&lport->disc.disc_mutex);
1549  rdata = lport->tt.rport_create(lport, FC_FID_MGMT_SERV);
1550  mutex_unlock(&lport->disc.disc_mutex);
1551  if (!rdata)
1552  goto err;
1553 
1554  rdata->ops = &fc_lport_rport_ops;
1555  lport->tt.rport_login(rdata);
1556  return;
1557 
1558 err:
1559  fc_lport_error(lport, NULL);
1560 }
1561 
1566 static void fc_lport_timeout(struct work_struct *work)
1567 {
1568  struct fc_lport *lport =
1569  container_of(work, struct fc_lport,
1570  retry_work.work);
1571 
1572  mutex_lock(&lport->lp_mutex);
1573 
1574  switch (lport->state) {
1575  case LPORT_ST_DISABLED:
1576  break;
1577  case LPORT_ST_READY:
1578  break;
1579  case LPORT_ST_RESET:
1580  break;
1581  case LPORT_ST_FLOGI:
1582  fc_lport_enter_flogi(lport);
1583  break;
1584  case LPORT_ST_DNS:
1585  fc_lport_enter_dns(lport);
1586  break;
1587  case LPORT_ST_RNN_ID:
1588  case LPORT_ST_RSNN_NN:
1589  case LPORT_ST_RSPN_ID:
1590  case LPORT_ST_RFT_ID:
1591  case LPORT_ST_RFF_ID:
1592  fc_lport_enter_ns(lport, lport->state);
1593  break;
1594  case LPORT_ST_FDMI:
1595  fc_lport_enter_fdmi(lport);
1596  break;
1597  case LPORT_ST_RHBA:
1598  case LPORT_ST_RPA:
1599  case LPORT_ST_DHBA:
1600  case LPORT_ST_DPRT:
1601  FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n",
1602  fc_lport_state(lport));
1603  /* fall thru */
1604  case LPORT_ST_SCR:
1605  fc_lport_enter_scr(lport);
1606  break;
1607  case LPORT_ST_LOGO:
1608  fc_lport_enter_logo(lport);
1609  break;
1610  }
1611 
1612  mutex_unlock(&lport->lp_mutex);
1613 }
1614 
1625 void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1626  void *lp_arg)
1627 {
1628  struct fc_lport *lport = lp_arg;
1629  u8 op;
1630 
1631  FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));
1632 
1633  if (fp == ERR_PTR(-FC_EX_CLOSED))
1634  return;
1635 
1636  mutex_lock(&lport->lp_mutex);
1637 
1638  if (lport->state != LPORT_ST_LOGO) {
1639  FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
1640  "%s\n", fc_lport_state(lport));
1641  if (IS_ERR(fp))
1642  goto err;
1643  goto out;
1644  }
1645 
1646  if (IS_ERR(fp)) {
1647  fc_lport_error(lport, fp);
1648  goto err;
1649  }
1650 
1651  op = fc_frame_payload_op(fp);
1652  if (op == ELS_LS_ACC)
1653  fc_lport_enter_disabled(lport);
1654  else
1655  fc_lport_error(lport, fp);
1656 
1657 out:
1658  fc_frame_free(fp);
1659 err:
1660  mutex_unlock(&lport->lp_mutex);
1661 }
1663 
1671 static void fc_lport_enter_logo(struct fc_lport *lport)
1672 {
1673  struct fc_frame *fp;
1674  struct fc_els_logo *logo;
1675 
1676  FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
1677  fc_lport_state(lport));
1678 
1679  fc_lport_state_enter(lport, LPORT_ST_LOGO);
1680  fc_vports_linkchange(lport);
1681 
1682  fp = fc_frame_alloc(lport, sizeof(*logo));
1683  if (!fp) {
1684  fc_lport_error(lport, fp);
1685  return;
1686  }
1687 
1688  if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
1689  fc_lport_logo_resp, lport,
1690  2 * lport->r_a_tov))
1691  fc_lport_error(lport, NULL);
1692 }
1693 
1704 void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1705  void *lp_arg)
1706 {
1707  struct fc_lport *lport = lp_arg;
1708  struct fc_frame_header *fh;
1709  struct fc_els_flogi *flp;
1710  u32 did;
1711  u16 csp_flags;
1712  unsigned int r_a_tov;
1713  unsigned int e_d_tov;
1714  u16 mfs;
1715 
1716  FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));
1717 
1718  if (fp == ERR_PTR(-FC_EX_CLOSED))
1719  return;
1720 
1721  mutex_lock(&lport->lp_mutex);
1722 
1723  if (lport->state != LPORT_ST_FLOGI) {
1724  FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
1725  "%s\n", fc_lport_state(lport));
1726  if (IS_ERR(fp))
1727  goto err;
1728  goto out;
1729  }
1730 
1731  if (IS_ERR(fp)) {
1732  fc_lport_error(lport, fp);
1733  goto err;
1734  }
1735 
1736  fh = fc_frame_header_get(fp);
1737  did = fc_frame_did(fp);
1738  if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
1739  fc_frame_payload_op(fp) != ELS_LS_ACC) {
1740  FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
1741  fc_lport_error(lport, fp);
1742  goto err;
1743  }
1744 
1745  flp = fc_frame_payload_get(fp, sizeof(*flp));
1746  if (!flp) {
1747  FC_LPORT_DBG(lport, "FLOGI bad response\n");
1748  fc_lport_error(lport, fp);
1749  goto err;
1750  }
1751 
1752  mfs = ntohs(flp->fl_csp.sp_bb_data) &
1754 
1755  if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
1756  FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
1757  "lport->mfs:%hu\n", mfs, lport->mfs);
1758  fc_lport_error(lport, fp);
1759  goto err;
1760  }
1761 
1762  if (mfs <= lport->mfs) {
1763  lport->mfs = mfs;
1764  fc_host_maxframe_size(lport->host) = mfs;
1765  }
1766 
1767  csp_flags = ntohs(flp->fl_csp.sp_features);
1768  r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1769  e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1770  if (csp_flags & FC_SP_FT_EDTR)
1771  e_d_tov /= 1000000;
1772 
1773  lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);
1774 
1775  if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1776  if (e_d_tov > lport->e_d_tov)
1777  lport->e_d_tov = e_d_tov;
1778  lport->r_a_tov = 2 * e_d_tov;
1779  fc_lport_set_port_id(lport, did, fp);
1780  printk(KERN_INFO "host%d: libfc: "
1781  "Port (%6.6x) entered "
1782  "point-to-point mode\n",
1783  lport->host->host_no, did);
1784  fc_lport_ptp_setup(lport, fc_frame_sid(fp),
1786  &flp->fl_wwpn),
1788  &flp->fl_wwnn));
1789  } else {
1790  lport->e_d_tov = e_d_tov;
1791  lport->r_a_tov = r_a_tov;
1792  fc_host_fabric_name(lport->host) =
1793  get_unaligned_be64(&flp->fl_wwnn);
1794  fc_lport_set_port_id(lport, did, fp);
1795  fc_lport_enter_dns(lport);
1796  }
1797 
1798 out:
1799  fc_frame_free(fp);
1800 err:
1801  mutex_unlock(&lport->lp_mutex);
1802 }
1804 
1812 static void fc_lport_enter_flogi(struct fc_lport *lport)
1813 {
1814  struct fc_frame *fp;
1815 
1816  FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
1817  fc_lport_state(lport));
1818 
1819  fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1820 
1821  if (lport->point_to_multipoint) {
1822  if (lport->port_id)
1823  fc_lport_enter_ready(lport);
1824  return;
1825  }
1826 
1827  fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1828  if (!fp)
1829  return fc_lport_error(lport, fp);
1830 
1831  if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp,
1832  lport->vport ? ELS_FDISC : ELS_FLOGI,
1833  fc_lport_flogi_resp, lport,
1834  lport->vport ? 2 * lport->r_a_tov :
1835  lport->e_d_tov))
1836  fc_lport_error(lport, NULL);
1837 }
1838 
1843 int fc_lport_config(struct fc_lport *lport)
1844 {
1845  INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1846  mutex_init(&lport->lp_mutex);
1847 
1848  fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1849 
1850  fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1851  fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1853 
1854  return 0;
1855 }
1857 
1862 int fc_lport_init(struct fc_lport *lport)
1863 {
1864  if (!lport->tt.lport_recv)
1865  lport->tt.lport_recv = fc_lport_recv_req;
1866 
1867  if (!lport->tt.lport_reset)
1868  lport->tt.lport_reset = fc_lport_reset;
1869 
1871  fc_host_node_name(lport->host) = lport->wwnn;
1872  fc_host_port_name(lport->host) = lport->wwpn;
1874  memset(fc_host_supported_fc4s(lport->host), 0,
1875  sizeof(fc_host_supported_fc4s(lport->host)));
1876  fc_host_supported_fc4s(lport->host)[2] = 1;
1877  fc_host_supported_fc4s(lport->host)[7] = 1;
1878 
1879  /* This value is also unchanging */
1880  memset(fc_host_active_fc4s(lport->host), 0,
1881  sizeof(fc_host_active_fc4s(lport->host)));
1882  fc_host_active_fc4s(lport->host)[2] = 1;
1883  fc_host_active_fc4s(lport->host)[7] = 1;
1884  fc_host_maxframe_size(lport->host) = lport->mfs;
1885  fc_host_supported_speeds(lport->host) = 0;
1890  fc_fc4_add_lport(lport);
1891 
1892  return 0;
1893 }
1895 
1902 static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
1903  void *info_arg)
1904 {
1905  struct fc_bsg_info *info = info_arg;
1906  struct fc_bsg_job *job = info->job;
1907  struct fc_lport *lport = info->lport;
1908  struct fc_frame_header *fh;
1909  size_t len;
1910  void *buf;
1911 
1912  if (IS_ERR(fp)) {
1913  job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
1914  -ECONNABORTED : -ETIMEDOUT;
1915  job->reply_len = sizeof(uint32_t);
1917  job->job_done(job);
1918  kfree(info);
1919  return;
1920  }
1921 
1922  mutex_lock(&lport->lp_mutex);
1923  fh = fc_frame_header_get(fp);
1924  len = fr_len(fp) - sizeof(*fh);
1925  buf = fc_frame_payload_get(fp, 0);
1926 
1927  if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
1928  /* Get the response code from the first frame payload */
1929  unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
1930  ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
1931  (unsigned short)fc_frame_payload_op(fp);
1932 
1933  /* Save the reply status of the job */
1934  job->reply->reply_data.ctels_reply.status =
1935  (cmd == info->rsp_code) ?
1937  }
1938 
1939  job->reply->reply_payload_rcv_len +=
1940  fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
1941  &info->offset, NULL);
1942 
1943  if (fr_eof(fp) == FC_EOF_T &&
1946  if (job->reply->reply_payload_rcv_len >
1947  job->reply_payload.payload_len)
1948  job->reply->reply_payload_rcv_len =
1949  job->reply_payload.payload_len;
1950  job->reply->result = 0;
1952  job->job_done(job);
1953  kfree(info);
1954  }
1955  fc_frame_free(fp);
1956  mutex_unlock(&lport->lp_mutex);
1957 }
1958 
1968 static int fc_lport_els_request(struct fc_bsg_job *job,
1969  struct fc_lport *lport,
1970  u32 did, u32 tov)
1971 {
1972  struct fc_bsg_info *info;
1973  struct fc_frame *fp;
1974  struct fc_frame_header *fh;
1975  char *pp;
1976  int len;
1977 
1978  fp = fc_frame_alloc(lport, job->request_payload.payload_len);
1979  if (!fp)
1980  return -ENOMEM;
1981 
1982  len = job->request_payload.payload_len;
1983  pp = fc_frame_payload_get(fp, len);
1984 
1985  sg_copy_to_buffer(job->request_payload.sg_list,
1986  job->request_payload.sg_cnt,
1987  pp, len);
1988 
1989  fh = fc_frame_header_get(fp);
1990  fh->fh_r_ctl = FC_RCTL_ELS_REQ;
1991  hton24(fh->fh_d_id, did);
1992  hton24(fh->fh_s_id, lport->port_id);
1993  fh->fh_type = FC_TYPE_ELS;
1994  hton24(fh->fh_f_ctl, FC_FCTL_REQ);
1995  fh->fh_cs_ctl = 0;
1996  fh->fh_df_ctl = 0;
1997  fh->fh_parm_offset = 0;
1998 
1999  info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2000  if (!info) {
2001  fc_frame_free(fp);
2002  return -ENOMEM;
2003  }
2004 
2005  info->job = job;
2006  info->lport = lport;
2007  info->rsp_code = ELS_LS_ACC;
2008  info->nents = job->reply_payload.sg_cnt;
2009  info->sg = job->reply_payload.sg_list;
2010 
2011  if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2012  NULL, info, tov)) {
2013  kfree(info);
2014  return -ECOMM;
2015  }
2016  return 0;
2017 }
2018 
2029 static int fc_lport_ct_request(struct fc_bsg_job *job,
2030  struct fc_lport *lport, u32 did, u32 tov)
2031 {
2032  struct fc_bsg_info *info;
2033  struct fc_frame *fp;
2034  struct fc_frame_header *fh;
2035  struct fc_ct_req *ct;
2036  size_t len;
2037 
2038  fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
2039  job->request_payload.payload_len);
2040  if (!fp)
2041  return -ENOMEM;
2042 
2043  len = job->request_payload.payload_len;
2044  ct = fc_frame_payload_get(fp, len);
2045 
2046  sg_copy_to_buffer(job->request_payload.sg_list,
2047  job->request_payload.sg_cnt,
2048  ct, len);
2049 
2050  fh = fc_frame_header_get(fp);
2052  hton24(fh->fh_d_id, did);
2053  hton24(fh->fh_s_id, lport->port_id);
2054  fh->fh_type = FC_TYPE_CT;
2055  hton24(fh->fh_f_ctl, FC_FCTL_REQ);
2056  fh->fh_cs_ctl = 0;
2057  fh->fh_df_ctl = 0;
2058  fh->fh_parm_offset = 0;
2059 
2060  info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2061  if (!info) {
2062  fc_frame_free(fp);
2063  return -ENOMEM;
2064  }
2065 
2066  info->job = job;
2067  info->lport = lport;
2068  info->rsp_code = FC_FS_ACC;
2069  info->nents = job->reply_payload.sg_cnt;
2070  info->sg = job->reply_payload.sg_list;
2071 
2072  if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2073  NULL, info, tov)) {
2074  kfree(info);
2075  return -ECOMM;
2076  }
2077  return 0;
2078 }
2079 
2086 {
2087  struct request *rsp = job->req->next_rq;
2088  struct Scsi_Host *shost = job->shost;
2089  struct fc_lport *lport = shost_priv(shost);
2090  struct fc_rport *rport;
2091  struct fc_rport_priv *rdata;
2092  int rc = -EINVAL;
2093  u32 did;
2094 
2095  job->reply->reply_payload_rcv_len = 0;
2096  if (rsp)
2097  rsp->resid_len = job->reply_payload.payload_len;
2098 
2099  mutex_lock(&lport->lp_mutex);
2100 
2101  switch (job->request->msgcode) {
2102  case FC_BSG_RPT_ELS:
2103  rport = job->rport;
2104  if (!rport)
2105  break;
2106 
2107  rdata = rport->dd_data;
2108  rc = fc_lport_els_request(job, lport, rport->port_id,
2109  rdata->e_d_tov);
2110  break;
2111 
2112  case FC_BSG_RPT_CT:
2113  rport = job->rport;
2114  if (!rport)
2115  break;
2116 
2117  rdata = rport->dd_data;
2118  rc = fc_lport_ct_request(job, lport, rport->port_id,
2119  rdata->e_d_tov);
2120  break;
2121 
2122  case FC_BSG_HST_CT:
2123  did = ntoh24(job->request->rqst_data.h_ct.port_id);
2124  if (did == FC_FID_DIR_SERV)
2125  rdata = lport->dns_rdata;
2126  else
2127  rdata = lport->tt.rport_lookup(lport, did);
2128 
2129  if (!rdata)
2130  break;
2131 
2132  rc = fc_lport_ct_request(job, lport, did, rdata->e_d_tov);
2133  break;
2134 
2136  did = ntoh24(job->request->rqst_data.h_els.port_id);
2137  rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
2138  break;
2139  }
2140 
2141  mutex_unlock(&lport->lp_mutex);
2142  return rc;
2143 }