2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
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.
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
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.
17 * Maintained at www.Open-FCoE.org
23 * These comments only apply to the 'port code' which consists of the lport,
24 * disc and rport blocks.
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.
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-
41 * lport > disc, lport > rport, disc > rport
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
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
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.
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
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.
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.
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).
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>
96 #include <scsi/fc/fc_gs.h>
98 #include <scsi/libfc.h>
99 #include <scsi/fc_encode.h>
100 #include <linux/scatterlist.h>
102 #include "fc_libfc.h"
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
108 #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
110 static void fc_lport_error(struct fc_lport *, struct fc_frame *);
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);
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",
143 * struct fc_bsg_info - FC Passthrough managemet structure
144 * @job: The passthrough job
145 * @lport: The local port to pass through a command
146 * @rsp_code: The expected response code
147 * @sg: job->reply_payload.sg_list
148 * @nents: job->reply_payload.sg_cnt
149 * @offset: The offset into the response data
152 struct fc_bsg_job *job;
153 struct fc_lport *lport;
155 struct scatterlist *sg;
161 * fc_frame_drop() - Dummy frame handler
162 * @lport: The local port the frame was received on
163 * @fp: The received frame
165 static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
172 * fc_lport_rport_callback() - Event handler for rport events
173 * @lport: The lport which is receiving the event
174 * @rdata: private remote port data
175 * @event: The event that occurred
177 * Locking Note: The rport lock should not be held when calling
180 static void fc_lport_rport_callback(struct fc_lport *lport,
181 struct fc_rport_priv *rdata,
182 enum fc_rport_event event)
184 FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event,
187 mutex_lock(&lport->lp_mutex);
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);
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,
203 lport->tt.rport_logoff(rdata);
207 case RPORT_EV_FAILED:
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;
217 mutex_unlock(&lport->lp_mutex);
221 * fc_lport_state() - Return a string which represents the lport's state
222 * @lport: The lport whose state is to converted to a string
224 static const char *fc_lport_state(struct fc_lport *lport)
228 cp = fc_lport_state_names[lport->state];
235 * fc_lport_ptp_setup() - Create an rport for point-to-point mode
236 * @lport: The lport to attach the ptp rport to
237 * @remote_fid: The FID of the ptp rport
238 * @remote_wwpn: The WWPN of the ptp rport
239 * @remote_wwnn: The WWNN of the ptp rport
241 static void fc_lport_ptp_setup(struct fc_lport *lport,
242 u32 remote_fid, u64 remote_wwpn,
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);
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);
256 lport->tt.rport_login(lport->ptp_rdata);
258 fc_lport_enter_ready(lport);
262 * fc_get_host_port_state() - Return the port state of the given Scsi_Host
263 * @shost: The SCSI host whose port state is to be determined
265 void fc_get_host_port_state(struct Scsi_Host *shost)
267 struct fc_lport *lport = shost_priv(shost);
269 mutex_lock(&lport->lp_mutex);
271 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
273 switch (lport->state) {
275 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
278 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
280 mutex_unlock(&lport->lp_mutex);
282 EXPORT_SYMBOL(fc_get_host_port_state);
285 * fc_get_host_speed() - Return the speed of the given Scsi_Host
286 * @shost: The SCSI host whose port speed is to be determined
288 void fc_get_host_speed(struct Scsi_Host *shost)
290 struct fc_lport *lport = shost_priv(shost);
292 fc_host_speed(shost) = lport->link_speed;
294 EXPORT_SYMBOL(fc_get_host_speed);
297 * fc_get_host_stats() - Return the Scsi_Host's statistics
298 * @shost: The SCSI host whose statistics are to be returned
300 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
302 struct fc_host_statistics *fc_stats;
303 struct fc_lport *lport = shost_priv(shost);
305 u64 fcp_in_bytes = 0;
306 u64 fcp_out_bytes = 0;
308 fc_stats = &lport->host_stats;
309 memset(fc_stats, 0, sizeof(struct fc_host_statistics));
311 fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;
313 for_each_possible_cpu(cpu) {
314 struct fc_stats *stats;
316 stats = per_cpu_ptr(lport->stats, cpu);
318 fc_stats->tx_frames += stats->TxFrames;
319 fc_stats->tx_words += stats->TxWords;
320 fc_stats->rx_frames += stats->RxFrames;
321 fc_stats->rx_words += stats->RxWords;
322 fc_stats->error_frames += stats->ErrorFrames;
323 fc_stats->invalid_crc_count += stats->InvalidCRCCount;
324 fc_stats->fcp_input_requests += stats->InputRequests;
325 fc_stats->fcp_output_requests += stats->OutputRequests;
326 fc_stats->fcp_control_requests += stats->ControlRequests;
327 fcp_in_bytes += stats->InputBytes;
328 fcp_out_bytes += stats->OutputBytes;
329 fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails;
330 fc_stats->fcp_packet_aborts += stats->FcpPktAborts;
331 fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails;
332 fc_stats->link_failure_count += stats->LinkFailureCount;
334 fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
335 fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
336 fc_stats->lip_count = -1;
337 fc_stats->nos_count = -1;
338 fc_stats->loss_of_sync_count = -1;
339 fc_stats->loss_of_signal_count = -1;
340 fc_stats->prim_seq_protocol_err_count = -1;
341 fc_stats->dumped_frames = -1;
343 /* update exches stats */
344 fc_exch_update_stats(lport);
348 EXPORT_SYMBOL(fc_get_host_stats);
351 * fc_lport_flogi_fill() - Fill in FLOGI command for request
352 * @lport: The local port the FLOGI is for
353 * @flogi: The FLOGI command
356 static void fc_lport_flogi_fill(struct fc_lport *lport,
357 struct fc_els_flogi *flogi,
360 struct fc_els_csp *sp;
361 struct fc_els_cssp *cp;
363 memset(flogi, 0, sizeof(*flogi));
364 flogi->fl_cmd = (u8) op;
365 put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
366 put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
368 sp->sp_hi_ver = 0x20;
369 sp->sp_lo_ver = 0x20;
370 sp->sp_bb_cred = htons(10); /* this gets set by gateway */
371 sp->sp_bb_data = htons((u16) lport->mfs);
372 cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
373 cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
374 if (op != ELS_FLOGI) {
375 sp->sp_features = htons(FC_SP_FT_CIRO);
376 sp->sp_tot_seq = htons(255); /* seq. we accept */
377 sp->sp_rel_off = htons(0x1f);
378 sp->sp_e_d_tov = htonl(lport->e_d_tov);
380 cp->cp_rdfs = htons((u16) lport->mfs);
381 cp->cp_con_seq = htons(255);
387 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
388 * @lport: The local port to add a new FC-4 type to
389 * @type: The new FC-4 type
391 static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
395 mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
396 *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
400 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
401 * @lport: Fibre Channel local port receiving the RLIR
402 * @fp: The RLIR request frame
404 * Locking Note: The lport lock is expected to be held before calling
407 static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
409 FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
410 fc_lport_state(lport));
412 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
417 * fc_lport_recv_echo_req() - Handle received ECHO request
418 * @lport: The local port receiving the ECHO
419 * @fp: ECHO request frame
421 * Locking Note: The lport lock is expected to be held before calling
424 static void fc_lport_recv_echo_req(struct fc_lport *lport,
425 struct fc_frame *in_fp)
432 FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
433 fc_lport_state(lport));
435 len = fr_len(in_fp) - sizeof(struct fc_frame_header);
436 pp = fc_frame_payload_get(in_fp, len);
438 if (len < sizeof(__be32))
439 len = sizeof(__be32);
441 fp = fc_frame_alloc(lport, len);
443 dp = fc_frame_payload_get(fp, len);
445 *((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
446 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
447 lport->tt.frame_send(lport, fp);
449 fc_frame_free(in_fp);
453 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request
454 * @lport: The local port receiving the RNID
455 * @fp: The RNID request frame
457 * Locking Note: The lport lock is expected to be held before calling
460 static void fc_lport_recv_rnid_req(struct fc_lport *lport,
461 struct fc_frame *in_fp)
464 struct fc_els_rnid *req;
466 struct fc_els_rnid_resp rnid;
467 struct fc_els_rnid_cid cid;
468 struct fc_els_rnid_gen gen;
470 struct fc_seq_els_data rjt_data;
474 FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
475 fc_lport_state(lport));
477 req = fc_frame_payload_get(in_fp, sizeof(*req));
479 rjt_data.reason = ELS_RJT_LOGIC;
480 rjt_data.explan = ELS_EXPL_NONE;
481 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
485 if (fmt != ELS_RNIDF_GEN ||
486 ntohl(lport->rnid_gen.rnid_atype) == 0) {
487 fmt = ELS_RNIDF_NONE; /* nothing to provide */
488 len -= sizeof(rp->gen);
490 fp = fc_frame_alloc(lport, len);
492 rp = fc_frame_payload_get(fp, len);
494 rp->rnid.rnid_cmd = ELS_LS_ACC;
495 rp->rnid.rnid_fmt = fmt;
496 rp->rnid.rnid_cid_len = sizeof(rp->cid);
497 rp->cid.rnid_wwpn = htonll(lport->wwpn);
498 rp->cid.rnid_wwnn = htonll(lport->wwnn);
499 if (fmt == ELS_RNIDF_GEN) {
500 rp->rnid.rnid_sid_len = sizeof(rp->gen);
501 memcpy(&rp->gen, &lport->rnid_gen,
504 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
505 lport->tt.frame_send(lport, fp);
508 fc_frame_free(in_fp);
512 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
513 * @lport: The local port receiving the LOGO
514 * @fp: The LOGO request frame
516 * Locking Note: The lport lock is expected to be held before calling
519 static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
521 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
522 fc_lport_enter_reset(lport);
527 * fc_fabric_login() - Start the lport state machine
528 * @lport: The local port that should log into the fabric
530 * Locking Note: This function should not be called
531 * with the lport lock held.
533 int fc_fabric_login(struct fc_lport *lport)
537 mutex_lock(&lport->lp_mutex);
538 if (lport->state == LPORT_ST_DISABLED ||
539 lport->state == LPORT_ST_LOGO) {
540 fc_lport_state_enter(lport, LPORT_ST_RESET);
541 fc_lport_enter_reset(lport);
544 mutex_unlock(&lport->lp_mutex);
548 EXPORT_SYMBOL(fc_fabric_login);
551 * __fc_linkup() - Handler for transport linkup events
552 * @lport: The lport whose link is up
554 * Locking: must be called with the lp_mutex held
556 void __fc_linkup(struct fc_lport *lport)
558 if (!lport->link_up) {
561 if (lport->state == LPORT_ST_RESET)
562 fc_lport_enter_flogi(lport);
567 * fc_linkup() - Handler for transport linkup events
568 * @lport: The local port whose link is up
570 void fc_linkup(struct fc_lport *lport)
572 printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
573 lport->host->host_no, lport->port_id);
575 mutex_lock(&lport->lp_mutex);
577 mutex_unlock(&lport->lp_mutex);
579 EXPORT_SYMBOL(fc_linkup);
582 * __fc_linkdown() - Handler for transport linkdown events
583 * @lport: The lport whose link is down
585 * Locking: must be called with the lp_mutex held
587 void __fc_linkdown(struct fc_lport *lport)
589 if (lport->link_up) {
591 fc_lport_enter_reset(lport);
592 lport->tt.fcp_cleanup(lport);
597 * fc_linkdown() - Handler for transport linkdown events
598 * @lport: The local port whose link is down
600 void fc_linkdown(struct fc_lport *lport)
602 printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
603 lport->host->host_no, lport->port_id);
605 mutex_lock(&lport->lp_mutex);
606 __fc_linkdown(lport);
607 mutex_unlock(&lport->lp_mutex);
609 EXPORT_SYMBOL(fc_linkdown);
612 * fc_fabric_logoff() - Logout of the fabric
613 * @lport: The local port to logoff the fabric
616 * 0 for success, -1 for failure
618 int fc_fabric_logoff(struct fc_lport *lport)
620 lport->tt.disc_stop_final(lport);
621 mutex_lock(&lport->lp_mutex);
622 if (lport->dns_rdata)
623 lport->tt.rport_logoff(lport->dns_rdata);
624 mutex_unlock(&lport->lp_mutex);
625 lport->tt.rport_flush_queue();
626 mutex_lock(&lport->lp_mutex);
627 fc_lport_enter_logo(lport);
628 mutex_unlock(&lport->lp_mutex);
629 cancel_delayed_work_sync(&lport->retry_work);
632 EXPORT_SYMBOL(fc_fabric_logoff);
635 * fc_lport_destroy() - Unregister a fc_lport
636 * @lport: The local port to unregister
639 * exit routine for fc_lport instance
640 * clean-up all the allocated memory
641 * and free up other system resources.
644 int fc_lport_destroy(struct fc_lport *lport)
646 mutex_lock(&lport->lp_mutex);
647 lport->state = LPORT_ST_DISABLED;
649 lport->tt.frame_send = fc_frame_drop;
650 mutex_unlock(&lport->lp_mutex);
652 lport->tt.fcp_abort_io(lport);
653 lport->tt.disc_stop_final(lport);
654 lport->tt.exch_mgr_reset(lport, 0, 0);
655 cancel_delayed_work_sync(&lport->retry_work);
656 fc_fc4_del_lport(lport);
659 EXPORT_SYMBOL(fc_lport_destroy);
662 * fc_set_mfs() - Set the maximum frame size for a local port
663 * @lport: The local port to set the MFS for
666 int fc_set_mfs(struct fc_lport *lport, u32 mfs)
668 unsigned int old_mfs;
671 mutex_lock(&lport->lp_mutex);
673 old_mfs = lport->mfs;
675 if (mfs >= FC_MIN_MAX_FRAME) {
677 if (mfs > FC_MAX_FRAME)
679 mfs -= sizeof(struct fc_frame_header);
684 if (!rc && mfs < old_mfs)
685 fc_lport_enter_reset(lport);
687 mutex_unlock(&lport->lp_mutex);
691 EXPORT_SYMBOL(fc_set_mfs);
694 * fc_lport_disc_callback() - Callback for discovery events
695 * @lport: The local port receiving the event
696 * @event: The discovery event
698 static void fc_lport_disc_callback(struct fc_lport *lport,
699 enum fc_disc_event event)
702 case DISC_EV_SUCCESS:
703 FC_LPORT_DBG(lport, "Discovery succeeded\n");
706 printk(KERN_ERR "host%d: libfc: "
707 "Discovery failed for port (%6.6x)\n",
708 lport->host->host_no, lport->port_id);
709 mutex_lock(&lport->lp_mutex);
710 fc_lport_enter_reset(lport);
711 mutex_unlock(&lport->lp_mutex);
720 * fc_rport_enter_ready() - Enter the ready state and start discovery
721 * @lport: The local port that is ready
723 * Locking Note: The lport lock is expected to be held before calling
726 static void fc_lport_enter_ready(struct fc_lport *lport)
728 FC_LPORT_DBG(lport, "Entered READY from state %s\n",
729 fc_lport_state(lport));
731 fc_lport_state_enter(lport, LPORT_ST_READY);
733 fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
734 fc_vports_linkchange(lport);
736 if (!lport->ptp_rdata)
737 lport->tt.disc_start(fc_lport_disc_callback, lport);
741 * fc_lport_set_port_id() - set the local port Port ID
742 * @lport: The local port which will have its Port ID set.
743 * @port_id: The new port ID.
744 * @fp: The frame containing the incoming request, or NULL.
746 * Locking Note: The lport lock is expected to be held before calling
749 static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
753 printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
754 lport->host->host_no, port_id);
756 lport->port_id = port_id;
758 /* Update the fc_host */
759 fc_host_port_id(lport->host) = port_id;
761 if (lport->tt.lport_set_port_id)
762 lport->tt.lport_set_port_id(lport, port_id, fp);
766 * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint
767 * @lport: The local port which will have its Port ID set.
768 * @port_id: The new port ID.
770 * Called by the lower-level driver when transport sets the local port_id.
771 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
772 * discovery to be skipped.
774 void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
776 mutex_lock(&lport->lp_mutex);
778 fc_lport_set_port_id(lport, port_id, NULL);
780 switch (lport->state) {
784 fc_lport_enter_ready(lport);
789 mutex_unlock(&lport->lp_mutex);
791 EXPORT_SYMBOL(fc_lport_set_local_id);
794 * fc_lport_recv_flogi_req() - Receive a FLOGI request
795 * @lport: The local port that received the request
796 * @rx_fp: The FLOGI frame
798 * A received FLOGI request indicates a point-to-point connection.
799 * Accept it with the common service parameters indicating our N port.
800 * Set up to do a PLOGI if we have the higher-number WWPN.
802 * Locking Note: The lport lock is expected to be held before calling
805 static void fc_lport_recv_flogi_req(struct fc_lport *lport,
806 struct fc_frame *rx_fp)
809 struct fc_frame_header *fh;
810 struct fc_els_flogi *flp;
811 struct fc_els_flogi *new_flp;
816 FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
817 fc_lport_state(lport));
819 remote_fid = fc_frame_sid(rx_fp);
820 flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
823 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
824 if (remote_wwpn == lport->wwpn) {
825 printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
826 "with same WWPN %16.16llx\n",
827 lport->host->host_no, remote_wwpn);
830 FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);
833 * XXX what is the right thing to do for FIDs?
834 * The originator might expect our S_ID to be 0xfffffe.
835 * But if so, both of us could end up with the same FID.
837 local_fid = FC_LOCAL_PTP_FID_LO;
838 if (remote_wwpn < lport->wwpn) {
839 local_fid = FC_LOCAL_PTP_FID_HI;
840 if (!remote_fid || remote_fid == local_fid)
841 remote_fid = FC_LOCAL_PTP_FID_LO;
842 } else if (!remote_fid) {
843 remote_fid = FC_LOCAL_PTP_FID_HI;
846 fc_lport_set_port_id(lport, local_fid, rx_fp);
848 fp = fc_frame_alloc(lport, sizeof(*flp));
850 new_flp = fc_frame_payload_get(fp, sizeof(*flp));
851 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
852 new_flp->fl_cmd = (u8) ELS_LS_ACC;
855 * Send the response. If this fails, the originator should
856 * repeat the sequence.
858 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
859 fh = fc_frame_header_get(fp);
860 hton24(fh->fh_s_id, local_fid);
861 hton24(fh->fh_d_id, remote_fid);
862 lport->tt.frame_send(lport, fp);
865 fc_lport_error(lport, fp);
867 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
868 get_unaligned_be64(&flp->fl_wwnn));
870 fc_frame_free(rx_fp);
874 * fc_lport_recv_els_req() - The generic lport ELS request handler
875 * @lport: The local port that received the request
876 * @fp: The request frame
878 * This function will see if the lport handles the request or
879 * if an rport should handle the request.
881 * Locking Note: This function should not be called with the lport
882 * lock held because it will grab the lock.
884 static void fc_lport_recv_els_req(struct fc_lport *lport,
887 void (*recv)(struct fc_lport *, struct fc_frame *);
889 mutex_lock(&lport->lp_mutex);
892 * Handle special ELS cases like FLOGI, LOGO, and
893 * RSCN here. These don't require a session.
894 * Even if we had a session, it might not be ready.
902 recv = lport->tt.rport_recv_req;
903 switch (fc_frame_payload_op(fp)) {
905 if (!lport->point_to_multipoint)
906 recv = fc_lport_recv_flogi_req;
909 if (fc_frame_sid(fp) == FC_FID_FLOGI)
910 recv = fc_lport_recv_logo_req;
913 recv = lport->tt.disc_recv_req;
916 recv = fc_lport_recv_echo_req;
919 recv = fc_lport_recv_rlir_req;
922 recv = fc_lport_recv_rnid_req;
928 mutex_unlock(&lport->lp_mutex);
931 static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
932 const struct fc_els_spp *spp_in,
933 struct fc_els_spp *spp_out)
935 return FC_SPP_RESP_INVL;
938 struct fc4_prov fc_lport_els_prov = {
939 .prli = fc_lport_els_prli,
940 .recv = fc_lport_recv_els_req,
944 * fc_lport_recv_req() - The generic lport request handler
945 * @lport: The lport that received the request
946 * @fp: The frame the request is in
948 * Locking Note: This function should not be called with the lport
949 * lock held because it may grab the lock.
951 static void fc_lport_recv_req(struct fc_lport *lport,
954 struct fc_frame_header *fh = fc_frame_header_get(fp);
955 struct fc_seq *sp = fr_seq(fp);
956 struct fc4_prov *prov;
959 * Use RCU read lock and module_lock to be sure module doesn't
960 * deregister and get unloaded while we're calling it.
961 * try_module_get() is inlined and accepts a NULL parameter.
962 * Only ELSes and FCP target ops should come through here.
963 * The locking is unfortunate, and a better scheme is being sought.
967 if (fh->fh_type >= FC_FC4_PROV_SIZE)
969 prov = rcu_dereference(fc_passive_prov[fh->fh_type]);
970 if (!prov || !try_module_get(prov->module))
973 prov->recv(lport, fp);
974 module_put(prov->module);
978 FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
981 lport->tt.exch_done(sp);
985 * fc_lport_reset() - Reset a local port
986 * @lport: The local port which should be reset
988 * Locking Note: This functions should not be called with the
991 int fc_lport_reset(struct fc_lport *lport)
993 cancel_delayed_work_sync(&lport->retry_work);
994 mutex_lock(&lport->lp_mutex);
995 fc_lport_enter_reset(lport);
996 mutex_unlock(&lport->lp_mutex);
999 EXPORT_SYMBOL(fc_lport_reset);
1002 * fc_lport_reset_locked() - Reset the local port w/ the lport lock held
1003 * @lport: The local port to be reset
1005 * Locking Note: The lport lock is expected to be held before calling
1008 static void fc_lport_reset_locked(struct fc_lport *lport)
1010 if (lport->dns_rdata)
1011 lport->tt.rport_logoff(lport->dns_rdata);
1013 if (lport->ptp_rdata) {
1014 lport->tt.rport_logoff(lport->ptp_rdata);
1015 kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
1016 lport->ptp_rdata = NULL;
1019 lport->tt.disc_stop(lport);
1021 lport->tt.exch_mgr_reset(lport, 0, 0);
1022 fc_host_fabric_name(lport->host) = 0;
1024 if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
1025 fc_lport_set_port_id(lport, 0, NULL);
1029 * fc_lport_enter_reset() - Reset the local port
1030 * @lport: The local port to be reset
1032 * Locking Note: The lport lock is expected to be held before calling
1035 static void fc_lport_enter_reset(struct fc_lport *lport)
1037 FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
1038 fc_lport_state(lport));
1040 if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
1045 fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
1047 fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
1049 fc_lport_state_enter(lport, LPORT_ST_RESET);
1050 fc_host_post_event(lport->host, fc_get_event_number(),
1051 FCH_EVT_LIPRESET, 0);
1052 fc_vports_linkchange(lport);
1053 fc_lport_reset_locked(lport);
1055 fc_lport_enter_flogi(lport);
1059 * fc_lport_enter_disabled() - Disable the local port
1060 * @lport: The local port to be reset
1062 * Locking Note: The lport lock is expected to be held before calling
1065 static void fc_lport_enter_disabled(struct fc_lport *lport)
1067 FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
1068 fc_lport_state(lport));
1070 fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1071 fc_vports_linkchange(lport);
1072 fc_lport_reset_locked(lport);
1076 * fc_lport_error() - Handler for any errors
1077 * @lport: The local port that the error was on
1078 * @fp: The error code encoded in a frame pointer
1080 * If the error was caused by a resource allocation failure
1081 * then wait for half a second and retry, otherwise retry
1082 * after the e_d_tov time.
1084 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
1086 unsigned long delay = 0;
1087 FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
1088 IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_lport_state(lport),
1089 lport->retry_count);
1091 if (PTR_ERR(fp) == -FC_EX_CLOSED)
1095 * Memory allocation failure, or the exchange timed out
1096 * or we received LS_RJT.
1099 if (lport->retry_count < lport->max_retry_count) {
1100 lport->retry_count++;
1102 delay = msecs_to_jiffies(500);
1104 delay = msecs_to_jiffies(lport->e_d_tov);
1106 schedule_delayed_work(&lport->retry_work, delay);
1108 fc_lport_enter_reset(lport);
1112 * fc_lport_ns_resp() - Handle response to a name server
1113 * registration exchange
1114 * @sp: current sequence in exchange
1115 * @fp: response frame
1116 * @lp_arg: Fibre Channel host port instance
1118 * Locking Note: This function will be called without the lport lock
1119 * held, but it will lock, call an _enter_* function or fc_lport_error()
1120 * and then unlock the lport.
1122 static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp,
1125 struct fc_lport *lport = lp_arg;
1126 struct fc_frame_header *fh;
1127 struct fc_ct_hdr *ct;
1129 FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp));
1131 if (fp == ERR_PTR(-FC_EX_CLOSED))
1134 mutex_lock(&lport->lp_mutex);
1136 if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
1137 FC_LPORT_DBG(lport, "Received a name server response, "
1138 "but in state %s\n", fc_lport_state(lport));
1145 fc_lport_error(lport, fp);
1149 fh = fc_frame_header_get(fp);
1150 ct = fc_frame_payload_get(fp, sizeof(*ct));
1152 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1153 ct->ct_fs_type == FC_FST_DIR &&
1154 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1155 ntohs(ct->ct_cmd) == FC_FS_ACC)
1156 switch (lport->state) {
1157 case LPORT_ST_RNN_ID:
1158 fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
1160 case LPORT_ST_RSNN_NN:
1161 fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
1163 case LPORT_ST_RSPN_ID:
1164 fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1166 case LPORT_ST_RFT_ID:
1167 fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
1169 case LPORT_ST_RFF_ID:
1170 if (lport->fdmi_enabled)
1171 fc_lport_enter_fdmi(lport);
1173 fc_lport_enter_scr(lport);
1176 /* should have already been caught by state checks */
1180 fc_lport_error(lport, fp);
1184 mutex_unlock(&lport->lp_mutex);
1188 * fc_lport_ms_resp() - Handle response to a management server
1190 * @sp: current sequence in exchange
1191 * @fp: response frame
1192 * @lp_arg: Fibre Channel host port instance
1194 * Locking Note: This function will be called without the lport lock
1195 * held, but it will lock, call an _enter_* function or fc_lport_error()
1196 * and then unlock the lport.
1198 static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp,
1201 struct fc_lport *lport = lp_arg;
1202 struct fc_frame_header *fh;
1203 struct fc_ct_hdr *ct;
1205 FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp));
1207 if (fp == ERR_PTR(-FC_EX_CLOSED))
1210 mutex_lock(&lport->lp_mutex);
1212 if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) {
1213 FC_LPORT_DBG(lport, "Received a management server response, "
1214 "but in state %s\n", fc_lport_state(lport));
1221 fc_lport_error(lport, fp);
1225 fh = fc_frame_header_get(fp);
1226 ct = fc_frame_payload_get(fp, sizeof(*ct));
1228 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1229 ct->ct_fs_type == FC_FST_MGMT &&
1230 ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
1231 FC_LPORT_DBG(lport, "Received a management server response, "
1232 "reason=%d explain=%d\n",
1236 switch (lport->state) {
1238 if (ntohs(ct->ct_cmd) == FC_FS_ACC)
1239 fc_lport_enter_ms(lport, LPORT_ST_RPA);
1240 else /* Error Skip RPA */
1241 fc_lport_enter_scr(lport);
1244 fc_lport_enter_scr(lport);
1247 fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1250 fc_lport_enter_ms(lport, LPORT_ST_DPRT);
1253 /* should have already been caught by state checks */
1257 /* Invalid Frame? */
1258 fc_lport_error(lport, fp);
1263 mutex_unlock(&lport->lp_mutex);
1267 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
1268 * @sp: current sequence in SCR exchange
1269 * @fp: response frame
1270 * @lp_arg: Fibre Channel lport port instance that sent the registration request
1272 * Locking Note: This function will be called without the lport lock
1273 * held, but it will lock, call an _enter_* function or fc_lport_error
1274 * and then unlock the lport.
1276 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1279 struct fc_lport *lport = lp_arg;
1282 FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));
1284 if (fp == ERR_PTR(-FC_EX_CLOSED))
1287 mutex_lock(&lport->lp_mutex);
1289 if (lport->state != LPORT_ST_SCR) {
1290 FC_LPORT_DBG(lport, "Received a SCR response, but in state "
1291 "%s\n", fc_lport_state(lport));
1298 fc_lport_error(lport, fp);
1302 op = fc_frame_payload_op(fp);
1303 if (op == ELS_LS_ACC)
1304 fc_lport_enter_ready(lport);
1306 fc_lport_error(lport, fp);
1311 mutex_unlock(&lport->lp_mutex);
1315 * fc_lport_enter_scr() - Send a SCR (State Change Register) request
1316 * @lport: The local port to register for state changes
1318 * Locking Note: The lport lock is expected to be held before calling
1321 static void fc_lport_enter_scr(struct fc_lport *lport)
1323 struct fc_frame *fp;
1325 FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
1326 fc_lport_state(lport));
1328 fc_lport_state_enter(lport, LPORT_ST_SCR);
1330 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1332 fc_lport_error(lport, fp);
1336 if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
1337 fc_lport_scr_resp, lport,
1338 2 * lport->r_a_tov))
1339 fc_lport_error(lport, NULL);
1343 * fc_lport_enter_ns() - register some object with the name server
1344 * @lport: Fibre Channel local port to register
1346 * Locking Note: The lport lock is expected to be held before calling
1349 static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
1351 struct fc_frame *fp;
1353 int size = sizeof(struct fc_ct_hdr);
1356 FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1357 fc_lport_state_names[state],
1358 fc_lport_state(lport));
1360 fc_lport_state_enter(lport, state);
1363 case LPORT_ST_RNN_ID:
1365 size += sizeof(struct fc_ns_rn_id);
1367 case LPORT_ST_RSNN_NN:
1368 len = strnlen(fc_host_symbolic_name(lport->host), 255);
1369 /* if there is no symbolic name, skip to RFT_ID */
1371 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1372 cmd = FC_NS_RSNN_NN;
1373 size += sizeof(struct fc_ns_rsnn) + len;
1375 case LPORT_ST_RSPN_ID:
1376 len = strnlen(fc_host_symbolic_name(lport->host), 255);
1377 /* if there is no symbolic name, skip to RFT_ID */
1379 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1380 cmd = FC_NS_RSPN_ID;
1381 size += sizeof(struct fc_ns_rspn) + len;
1383 case LPORT_ST_RFT_ID:
1385 size += sizeof(struct fc_ns_rft);
1387 case LPORT_ST_RFF_ID:
1389 size += sizeof(struct fc_ns_rff_id);
1392 fc_lport_error(lport, NULL);
1396 fp = fc_frame_alloc(lport, size);
1398 fc_lport_error(lport, fp);
1402 if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
1404 lport, 3 * lport->r_a_tov))
1405 fc_lport_error(lport, fp);
1408 static struct fc_rport_operations fc_lport_rport_ops = {
1409 .event_callback = fc_lport_rport_callback,
1413 * fc_rport_enter_dns() - Create a fc_rport for the name server
1414 * @lport: The local port requesting a remote port for the name server
1416 * Locking Note: The lport lock is expected to be held before calling
1419 static void fc_lport_enter_dns(struct fc_lport *lport)
1421 struct fc_rport_priv *rdata;
1423 FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
1424 fc_lport_state(lport));
1426 fc_lport_state_enter(lport, LPORT_ST_DNS);
1428 mutex_lock(&lport->disc.disc_mutex);
1429 rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV);
1430 mutex_unlock(&lport->disc.disc_mutex);
1434 rdata->ops = &fc_lport_rport_ops;
1435 lport->tt.rport_login(rdata);
1439 fc_lport_error(lport, NULL);
1443 * fc_lport_enter_ms() - management server commands
1444 * @lport: Fibre Channel local port to register
1446 * Locking Note: The lport lock is expected to be held before calling
1449 static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
1451 struct fc_frame *fp;
1452 enum fc_fdmi_req cmd;
1453 int size = sizeof(struct fc_ct_hdr);
1457 FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1458 fc_lport_state_names[state],
1459 fc_lport_state(lport));
1461 fc_lport_state_enter(lport, state);
1466 /* Number of HBA Attributes */
1468 len = sizeof(struct fc_fdmi_rhba);
1469 len -= sizeof(struct fc_fdmi_attr_entry);
1470 len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1471 len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
1472 len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
1473 len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
1474 len += FC_FDMI_HBA_ATTR_MODEL_LEN;
1475 len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
1476 len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
1477 len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
1478 len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
1479 len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
1480 len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
1486 /* Number of Port Attributes */
1488 len = sizeof(struct fc_fdmi_rpa);
1489 len -= sizeof(struct fc_fdmi_attr_entry);
1490 len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1491 len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
1492 len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
1493 len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
1494 len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
1495 len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
1496 len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
1502 len = sizeof(struct fc_fdmi_dprt);
1507 len = sizeof(struct fc_fdmi_dhba);
1511 fc_lport_error(lport, NULL);
1515 FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
1516 cmd, (int)len, size);
1517 fp = fc_frame_alloc(lport, size);
1519 fc_lport_error(lport, fp);
1523 if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
1525 lport, 3 * lport->r_a_tov))
1526 fc_lport_error(lport, fp);
1530 * fc_rport_enter_fdmi() - Create a fc_rport for the management server
1531 * @lport: The local port requesting a remote port for the management server
1533 * Locking Note: The lport lock is expected to be held before calling
1536 static void fc_lport_enter_fdmi(struct fc_lport *lport)
1538 struct fc_rport_priv *rdata;
1540 FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
1541 fc_lport_state(lport));
1543 fc_lport_state_enter(lport, LPORT_ST_FDMI);
1545 mutex_lock(&lport->disc.disc_mutex);
1546 rdata = lport->tt.rport_create(lport, FC_FID_MGMT_SERV);
1547 mutex_unlock(&lport->disc.disc_mutex);
1551 rdata->ops = &fc_lport_rport_ops;
1552 lport->tt.rport_login(rdata);
1556 fc_lport_error(lport, NULL);
1560 * fc_lport_timeout() - Handler for the retry_work timer
1561 * @work: The work struct of the local port
1563 static void fc_lport_timeout(struct work_struct *work)
1565 struct fc_lport *lport =
1566 container_of(work, struct fc_lport,
1569 mutex_lock(&lport->lp_mutex);
1571 switch (lport->state) {
1572 case LPORT_ST_DISABLED:
1574 case LPORT_ST_READY:
1576 case LPORT_ST_RESET:
1578 case LPORT_ST_FLOGI:
1579 fc_lport_enter_flogi(lport);
1582 fc_lport_enter_dns(lport);
1584 case LPORT_ST_RNN_ID:
1585 case LPORT_ST_RSNN_NN:
1586 case LPORT_ST_RSPN_ID:
1587 case LPORT_ST_RFT_ID:
1588 case LPORT_ST_RFF_ID:
1589 fc_lport_enter_ns(lport, lport->state);
1592 fc_lport_enter_fdmi(lport);
1598 FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n",
1599 fc_lport_state(lport));
1602 fc_lport_enter_scr(lport);
1605 fc_lport_enter_logo(lport);
1609 mutex_unlock(&lport->lp_mutex);
1613 * fc_lport_logo_resp() - Handle response to LOGO request
1614 * @sp: The sequence that the LOGO was on
1615 * @fp: The LOGO frame
1616 * @lp_arg: The lport port that received the LOGO request
1618 * Locking Note: This function will be called without the lport lock
1619 * held, but it will lock, call an _enter_* function or fc_lport_error()
1620 * and then unlock the lport.
1622 void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1625 struct fc_lport *lport = lp_arg;
1628 FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));
1630 if (fp == ERR_PTR(-FC_EX_CLOSED))
1633 mutex_lock(&lport->lp_mutex);
1635 if (lport->state != LPORT_ST_LOGO) {
1636 FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
1637 "%s\n", fc_lport_state(lport));
1644 fc_lport_error(lport, fp);
1648 op = fc_frame_payload_op(fp);
1649 if (op == ELS_LS_ACC)
1650 fc_lport_enter_disabled(lport);
1652 fc_lport_error(lport, fp);
1657 mutex_unlock(&lport->lp_mutex);
1659 EXPORT_SYMBOL(fc_lport_logo_resp);
1662 * fc_rport_enter_logo() - Logout of the fabric
1663 * @lport: The local port to be logged out
1665 * Locking Note: The lport lock is expected to be held before calling
1668 static void fc_lport_enter_logo(struct fc_lport *lport)
1670 struct fc_frame *fp;
1671 struct fc_els_logo *logo;
1673 FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
1674 fc_lport_state(lport));
1676 fc_lport_state_enter(lport, LPORT_ST_LOGO);
1677 fc_vports_linkchange(lport);
1679 fp = fc_frame_alloc(lport, sizeof(*logo));
1681 fc_lport_error(lport, fp);
1685 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
1686 fc_lport_logo_resp, lport,
1687 2 * lport->r_a_tov))
1688 fc_lport_error(lport, NULL);
1692 * fc_lport_flogi_resp() - Handle response to FLOGI request
1693 * @sp: The sequence that the FLOGI was on
1694 * @fp: The FLOGI response frame
1695 * @lp_arg: The lport port that received the FLOGI response
1697 * Locking Note: This function will be called without the lport lock
1698 * held, but it will lock, call an _enter_* function or fc_lport_error()
1699 * and then unlock the lport.
1701 void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1704 struct fc_lport *lport = lp_arg;
1705 struct fc_frame_header *fh;
1706 struct fc_els_flogi *flp;
1709 unsigned int r_a_tov;
1710 unsigned int e_d_tov;
1713 FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));
1715 if (fp == ERR_PTR(-FC_EX_CLOSED))
1718 mutex_lock(&lport->lp_mutex);
1720 if (lport->state != LPORT_ST_FLOGI) {
1721 FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
1722 "%s\n", fc_lport_state(lport));
1729 fc_lport_error(lport, fp);
1733 fh = fc_frame_header_get(fp);
1734 did = fc_frame_did(fp);
1735 if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
1736 fc_frame_payload_op(fp) != ELS_LS_ACC) {
1737 FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
1738 fc_lport_error(lport, fp);
1742 flp = fc_frame_payload_get(fp, sizeof(*flp));
1744 FC_LPORT_DBG(lport, "FLOGI bad response\n");
1745 fc_lport_error(lport, fp);
1749 mfs = ntohs(flp->fl_csp.sp_bb_data) &
1752 if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
1753 FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
1754 "lport->mfs:%hu\n", mfs, lport->mfs);
1755 fc_lport_error(lport, fp);
1759 if (mfs <= lport->mfs) {
1761 fc_host_maxframe_size(lport->host) = mfs;
1764 csp_flags = ntohs(flp->fl_csp.sp_features);
1765 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1766 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1767 if (csp_flags & FC_SP_FT_EDTR)
1770 lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);
1772 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1773 if (e_d_tov > lport->e_d_tov)
1774 lport->e_d_tov = e_d_tov;
1775 lport->r_a_tov = 2 * e_d_tov;
1776 fc_lport_set_port_id(lport, did, fp);
1777 printk(KERN_INFO "host%d: libfc: "
1778 "Port (%6.6x) entered "
1779 "point-to-point mode\n",
1780 lport->host->host_no, did);
1781 fc_lport_ptp_setup(lport, fc_frame_sid(fp),
1787 lport->e_d_tov = e_d_tov;
1788 lport->r_a_tov = r_a_tov;
1789 fc_host_fabric_name(lport->host) =
1790 get_unaligned_be64(&flp->fl_wwnn);
1791 fc_lport_set_port_id(lport, did, fp);
1792 fc_lport_enter_dns(lport);
1798 mutex_unlock(&lport->lp_mutex);
1800 EXPORT_SYMBOL(fc_lport_flogi_resp);
1803 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
1804 * @lport: Fibre Channel local port to be logged in to the fabric
1806 * Locking Note: The lport lock is expected to be held before calling
1809 static void fc_lport_enter_flogi(struct fc_lport *lport)
1811 struct fc_frame *fp;
1813 FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
1814 fc_lport_state(lport));
1816 fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1818 if (lport->point_to_multipoint) {
1820 fc_lport_enter_ready(lport);
1824 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1826 return fc_lport_error(lport, fp);
1828 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp,
1829 lport->vport ? ELS_FDISC : ELS_FLOGI,
1830 fc_lport_flogi_resp, lport,
1831 lport->vport ? 2 * lport->r_a_tov :
1833 fc_lport_error(lport, NULL);
1837 * fc_lport_config() - Configure a fc_lport
1838 * @lport: The local port to be configured
1840 int fc_lport_config(struct fc_lport *lport)
1842 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1843 mutex_init(&lport->lp_mutex);
1845 fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1847 fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1848 fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1849 fc_fc4_conf_lport_params(lport, FC_TYPE_FCP);
1853 EXPORT_SYMBOL(fc_lport_config);
1856 * fc_lport_init() - Initialize the lport layer for a local port
1857 * @lport: The local port to initialize the exchange layer for
1859 int fc_lport_init(struct fc_lport *lport)
1861 if (!lport->tt.lport_recv)
1862 lport->tt.lport_recv = fc_lport_recv_req;
1864 if (!lport->tt.lport_reset)
1865 lport->tt.lport_reset = fc_lport_reset;
1867 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
1868 fc_host_node_name(lport->host) = lport->wwnn;
1869 fc_host_port_name(lport->host) = lport->wwpn;
1870 fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
1871 memset(fc_host_supported_fc4s(lport->host), 0,
1872 sizeof(fc_host_supported_fc4s(lport->host)));
1873 fc_host_supported_fc4s(lport->host)[2] = 1;
1874 fc_host_supported_fc4s(lport->host)[7] = 1;
1876 /* This value is also unchanging */
1877 memset(fc_host_active_fc4s(lport->host), 0,
1878 sizeof(fc_host_active_fc4s(lport->host)));
1879 fc_host_active_fc4s(lport->host)[2] = 1;
1880 fc_host_active_fc4s(lport->host)[7] = 1;
1881 fc_host_maxframe_size(lport->host) = lport->mfs;
1882 fc_host_supported_speeds(lport->host) = 0;
1883 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
1884 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
1885 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
1886 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
1887 fc_fc4_add_lport(lport);
1891 EXPORT_SYMBOL(fc_lport_init);
1894 * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests
1895 * @sp: The sequence for the FC Passthrough response
1896 * @fp: The response frame
1897 * @info_arg: The BSG info that the response is for
1899 static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
1902 struct fc_bsg_info *info = info_arg;
1903 struct fc_bsg_job *job = info->job;
1904 struct fc_lport *lport = info->lport;
1905 struct fc_frame_header *fh;
1910 job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
1911 -ECONNABORTED : -ETIMEDOUT;
1912 job->reply_len = sizeof(uint32_t);
1913 job->state_flags |= FC_RQST_STATE_DONE;
1919 mutex_lock(&lport->lp_mutex);
1920 fh = fc_frame_header_get(fp);
1921 len = fr_len(fp) - sizeof(*fh);
1922 buf = fc_frame_payload_get(fp, 0);
1924 if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
1925 /* Get the response code from the first frame payload */
1926 unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
1927 ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
1928 (unsigned short)fc_frame_payload_op(fp);
1930 /* Save the reply status of the job */
1931 job->reply->reply_data.ctels_reply.status =
1932 (cmd == info->rsp_code) ?
1933 FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
1936 job->reply->reply_payload_rcv_len +=
1937 fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
1938 &info->offset, NULL);
1940 if (fr_eof(fp) == FC_EOF_T &&
1941 (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1942 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1943 if (job->reply->reply_payload_rcv_len >
1944 job->reply_payload.payload_len)
1945 job->reply->reply_payload_rcv_len =
1946 job->reply_payload.payload_len;
1947 job->reply->result = 0;
1948 job->state_flags |= FC_RQST_STATE_DONE;
1953 mutex_unlock(&lport->lp_mutex);
1957 * fc_lport_els_request() - Send ELS passthrough request
1958 * @job: The BSG Passthrough job
1959 * @lport: The local port sending the request
1960 * @did: The destination port id
1962 * Locking Note: The lport lock is expected to be held before calling
1965 static int fc_lport_els_request(struct fc_bsg_job *job,
1966 struct fc_lport *lport,
1969 struct fc_bsg_info *info;
1970 struct fc_frame *fp;
1971 struct fc_frame_header *fh;
1975 fp = fc_frame_alloc(lport, job->request_payload.payload_len);
1979 len = job->request_payload.payload_len;
1980 pp = fc_frame_payload_get(fp, len);
1982 sg_copy_to_buffer(job->request_payload.sg_list,
1983 job->request_payload.sg_cnt,
1986 fh = fc_frame_header_get(fp);
1987 fh->fh_r_ctl = FC_RCTL_ELS_REQ;
1988 hton24(fh->fh_d_id, did);
1989 hton24(fh->fh_s_id, lport->port_id);
1990 fh->fh_type = FC_TYPE_ELS;
1991 hton24(fh->fh_f_ctl, FC_FCTL_REQ);
1994 fh->fh_parm_offset = 0;
1996 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2003 info->lport = lport;
2004 info->rsp_code = ELS_LS_ACC;
2005 info->nents = job->reply_payload.sg_cnt;
2006 info->sg = job->reply_payload.sg_list;
2008 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2017 * fc_lport_ct_request() - Send CT Passthrough request
2018 * @job: The BSG Passthrough job
2019 * @lport: The local port sending the request
2020 * @did: The destination FC-ID
2021 * @tov: The timeout period to wait for the response
2023 * Locking Note: The lport lock is expected to be held before calling
2026 static int fc_lport_ct_request(struct fc_bsg_job *job,
2027 struct fc_lport *lport, u32 did, u32 tov)
2029 struct fc_bsg_info *info;
2030 struct fc_frame *fp;
2031 struct fc_frame_header *fh;
2032 struct fc_ct_req *ct;
2035 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
2036 job->request_payload.payload_len);
2040 len = job->request_payload.payload_len;
2041 ct = fc_frame_payload_get(fp, len);
2043 sg_copy_to_buffer(job->request_payload.sg_list,
2044 job->request_payload.sg_cnt,
2047 fh = fc_frame_header_get(fp);
2048 fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
2049 hton24(fh->fh_d_id, did);
2050 hton24(fh->fh_s_id, lport->port_id);
2051 fh->fh_type = FC_TYPE_CT;
2052 hton24(fh->fh_f_ctl, FC_FCTL_REQ);
2055 fh->fh_parm_offset = 0;
2057 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2064 info->lport = lport;
2065 info->rsp_code = FC_FS_ACC;
2066 info->nents = job->reply_payload.sg_cnt;
2067 info->sg = job->reply_payload.sg_list;
2069 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2078 * fc_lport_bsg_request() - The common entry point for sending
2079 * FC Passthrough requests
2080 * @job: The BSG passthrough job
2082 int fc_lport_bsg_request(struct fc_bsg_job *job)
2084 struct request *rsp = job->req->next_rq;
2085 struct Scsi_Host *shost = job->shost;
2086 struct fc_lport *lport = shost_priv(shost);
2087 struct fc_rport *rport;
2088 struct fc_rport_priv *rdata;
2092 job->reply->reply_payload_rcv_len = 0;
2094 rsp->resid_len = job->reply_payload.payload_len;
2096 mutex_lock(&lport->lp_mutex);
2098 switch (job->request->msgcode) {
2099 case FC_BSG_RPT_ELS:
2104 rdata = rport->dd_data;
2105 rc = fc_lport_els_request(job, lport, rport->port_id,
2114 rdata = rport->dd_data;
2115 rc = fc_lport_ct_request(job, lport, rport->port_id,
2120 did = ntoh24(job->request->rqst_data.h_ct.port_id);
2121 if (did == FC_FID_DIR_SERV) {
2122 rdata = lport->dns_rdata;
2125 tov = rdata->e_d_tov;
2127 rdata = lport->tt.rport_lookup(lport, did);
2130 tov = rdata->e_d_tov;
2131 kref_put(&rdata->kref, lport->tt.rport_destroy);
2134 rc = fc_lport_ct_request(job, lport, did, tov);
2137 case FC_BSG_HST_ELS_NOLOGIN:
2138 did = ntoh24(job->request->rqst_data.h_els.port_id);
2139 rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
2143 mutex_unlock(&lport->lp_mutex);
2146 EXPORT_SYMBOL(fc_lport_bsg_request);