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 *fcoe_stats;
303 struct fc_lport *lport = shost_priv(shost);
304 struct timespec v0, v1;
306 u64 fcp_in_bytes = 0;
307 u64 fcp_out_bytes = 0;
309 fcoe_stats = &lport->host_stats;
310 memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
312 jiffies_to_timespec(jiffies, &v0);
313 jiffies_to_timespec(lport->boot_time, &v1);
314 fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
316 for_each_possible_cpu(cpu) {
317 struct fcoe_dev_stats *stats;
319 stats = per_cpu_ptr(lport->dev_stats, cpu);
321 fcoe_stats->tx_frames += stats->TxFrames;
322 fcoe_stats->tx_words += stats->TxWords;
323 fcoe_stats->rx_frames += stats->RxFrames;
324 fcoe_stats->rx_words += stats->RxWords;
325 fcoe_stats->error_frames += stats->ErrorFrames;
326 fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
327 fcoe_stats->fcp_input_requests += stats->InputRequests;
328 fcoe_stats->fcp_output_requests += stats->OutputRequests;
329 fcoe_stats->fcp_control_requests += stats->ControlRequests;
330 fcp_in_bytes += stats->InputBytes;
331 fcp_out_bytes += stats->OutputBytes;
332 fcoe_stats->link_failure_count += stats->LinkFailureCount;
334 fcoe_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
335 fcoe_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
336 fcoe_stats->lip_count = -1;
337 fcoe_stats->nos_count = -1;
338 fcoe_stats->loss_of_sync_count = -1;
339 fcoe_stats->loss_of_signal_count = -1;
340 fcoe_stats->prim_seq_protocol_err_count = -1;
341 fcoe_stats->dumped_frames = -1;
344 EXPORT_SYMBOL(fc_get_host_stats);
347 * fc_lport_flogi_fill() - Fill in FLOGI command for request
348 * @lport: The local port the FLOGI is for
349 * @flogi: The FLOGI command
352 static void fc_lport_flogi_fill(struct fc_lport *lport,
353 struct fc_els_flogi *flogi,
356 struct fc_els_csp *sp;
357 struct fc_els_cssp *cp;
359 memset(flogi, 0, sizeof(*flogi));
360 flogi->fl_cmd = (u8) op;
361 put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
362 put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
364 sp->sp_hi_ver = 0x20;
365 sp->sp_lo_ver = 0x20;
366 sp->sp_bb_cred = htons(10); /* this gets set by gateway */
367 sp->sp_bb_data = htons((u16) lport->mfs);
368 cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
369 cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
370 if (op != ELS_FLOGI) {
371 sp->sp_features = htons(FC_SP_FT_CIRO);
372 sp->sp_tot_seq = htons(255); /* seq. we accept */
373 sp->sp_rel_off = htons(0x1f);
374 sp->sp_e_d_tov = htonl(lport->e_d_tov);
376 cp->cp_rdfs = htons((u16) lport->mfs);
377 cp->cp_con_seq = htons(255);
383 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
384 * @lport: The local port to add a new FC-4 type to
385 * @type: The new FC-4 type
387 static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
391 mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
392 *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
396 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
397 * @lport: Fibre Channel local port receiving the RLIR
398 * @fp: The RLIR request frame
400 * Locking Note: The lport lock is expected to be held before calling
403 static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
405 FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
406 fc_lport_state(lport));
408 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
413 * fc_lport_recv_echo_req() - Handle received ECHO request
414 * @lport: The local port receiving the ECHO
415 * @fp: ECHO request frame
417 * Locking Note: The lport lock is expected to be held before calling
420 static void fc_lport_recv_echo_req(struct fc_lport *lport,
421 struct fc_frame *in_fp)
428 FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
429 fc_lport_state(lport));
431 len = fr_len(in_fp) - sizeof(struct fc_frame_header);
432 pp = fc_frame_payload_get(in_fp, len);
434 if (len < sizeof(__be32))
435 len = sizeof(__be32);
437 fp = fc_frame_alloc(lport, len);
439 dp = fc_frame_payload_get(fp, len);
441 *((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
442 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
443 lport->tt.frame_send(lport, fp);
445 fc_frame_free(in_fp);
449 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request
450 * @lport: The local port receiving the RNID
451 * @fp: The RNID request frame
453 * Locking Note: The lport lock is expected to be held before calling
456 static void fc_lport_recv_rnid_req(struct fc_lport *lport,
457 struct fc_frame *in_fp)
460 struct fc_els_rnid *req;
462 struct fc_els_rnid_resp rnid;
463 struct fc_els_rnid_cid cid;
464 struct fc_els_rnid_gen gen;
466 struct fc_seq_els_data rjt_data;
470 FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
471 fc_lport_state(lport));
473 req = fc_frame_payload_get(in_fp, sizeof(*req));
475 rjt_data.reason = ELS_RJT_LOGIC;
476 rjt_data.explan = ELS_EXPL_NONE;
477 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
481 if (fmt != ELS_RNIDF_GEN ||
482 ntohl(lport->rnid_gen.rnid_atype) == 0) {
483 fmt = ELS_RNIDF_NONE; /* nothing to provide */
484 len -= sizeof(rp->gen);
486 fp = fc_frame_alloc(lport, len);
488 rp = fc_frame_payload_get(fp, len);
490 rp->rnid.rnid_cmd = ELS_LS_ACC;
491 rp->rnid.rnid_fmt = fmt;
492 rp->rnid.rnid_cid_len = sizeof(rp->cid);
493 rp->cid.rnid_wwpn = htonll(lport->wwpn);
494 rp->cid.rnid_wwnn = htonll(lport->wwnn);
495 if (fmt == ELS_RNIDF_GEN) {
496 rp->rnid.rnid_sid_len = sizeof(rp->gen);
497 memcpy(&rp->gen, &lport->rnid_gen,
500 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
501 lport->tt.frame_send(lport, fp);
504 fc_frame_free(in_fp);
508 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
509 * @lport: The local port receiving the LOGO
510 * @fp: The LOGO request frame
512 * Locking Note: The lport lock is exected to be held before calling
515 static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
517 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
518 fc_lport_enter_reset(lport);
523 * fc_fabric_login() - Start the lport state machine
524 * @lport: The local port that should log into the fabric
526 * Locking Note: This function should not be called
527 * with the lport lock held.
529 int fc_fabric_login(struct fc_lport *lport)
533 mutex_lock(&lport->lp_mutex);
534 if (lport->state == LPORT_ST_DISABLED ||
535 lport->state == LPORT_ST_LOGO) {
536 fc_lport_state_enter(lport, LPORT_ST_RESET);
537 fc_lport_enter_reset(lport);
540 mutex_unlock(&lport->lp_mutex);
544 EXPORT_SYMBOL(fc_fabric_login);
547 * __fc_linkup() - Handler for transport linkup events
548 * @lport: The lport whose link is up
550 * Locking: must be called with the lp_mutex held
552 void __fc_linkup(struct fc_lport *lport)
554 if (!lport->link_up) {
557 if (lport->state == LPORT_ST_RESET)
558 fc_lport_enter_flogi(lport);
563 * fc_linkup() - Handler for transport linkup events
564 * @lport: The local port whose link is up
566 void fc_linkup(struct fc_lport *lport)
568 printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
569 lport->host->host_no, lport->port_id);
571 mutex_lock(&lport->lp_mutex);
573 mutex_unlock(&lport->lp_mutex);
575 EXPORT_SYMBOL(fc_linkup);
578 * __fc_linkdown() - Handler for transport linkdown events
579 * @lport: The lport whose link is down
581 * Locking: must be called with the lp_mutex held
583 void __fc_linkdown(struct fc_lport *lport)
585 if (lport->link_up) {
587 fc_lport_enter_reset(lport);
588 lport->tt.fcp_cleanup(lport);
593 * fc_linkdown() - Handler for transport linkdown events
594 * @lport: The local port whose link is down
596 void fc_linkdown(struct fc_lport *lport)
598 printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
599 lport->host->host_no, lport->port_id);
601 mutex_lock(&lport->lp_mutex);
602 __fc_linkdown(lport);
603 mutex_unlock(&lport->lp_mutex);
605 EXPORT_SYMBOL(fc_linkdown);
608 * fc_fabric_logoff() - Logout of the fabric
609 * @lport: The local port to logoff the fabric
612 * 0 for success, -1 for failure
614 int fc_fabric_logoff(struct fc_lport *lport)
616 lport->tt.disc_stop_final(lport);
617 mutex_lock(&lport->lp_mutex);
618 if (lport->dns_rdata)
619 lport->tt.rport_logoff(lport->dns_rdata);
620 mutex_unlock(&lport->lp_mutex);
621 lport->tt.rport_flush_queue();
622 mutex_lock(&lport->lp_mutex);
623 fc_lport_enter_logo(lport);
624 mutex_unlock(&lport->lp_mutex);
625 cancel_delayed_work_sync(&lport->retry_work);
628 EXPORT_SYMBOL(fc_fabric_logoff);
631 * fc_lport_destroy() - Unregister a fc_lport
632 * @lport: The local port to unregister
635 * exit routine for fc_lport instance
636 * clean-up all the allocated memory
637 * and free up other system resources.
640 int fc_lport_destroy(struct fc_lport *lport)
642 mutex_lock(&lport->lp_mutex);
643 lport->state = LPORT_ST_DISABLED;
645 lport->tt.frame_send = fc_frame_drop;
646 mutex_unlock(&lport->lp_mutex);
648 lport->tt.fcp_abort_io(lport);
649 lport->tt.disc_stop_final(lport);
650 lport->tt.exch_mgr_reset(lport, 0, 0);
651 fc_fc4_del_lport(lport);
654 EXPORT_SYMBOL(fc_lport_destroy);
657 * fc_set_mfs() - Set the maximum frame size for a local port
658 * @lport: The local port to set the MFS for
661 int fc_set_mfs(struct fc_lport *lport, u32 mfs)
663 unsigned int old_mfs;
666 mutex_lock(&lport->lp_mutex);
668 old_mfs = lport->mfs;
670 if (mfs >= FC_MIN_MAX_FRAME) {
672 if (mfs > FC_MAX_FRAME)
674 mfs -= sizeof(struct fc_frame_header);
679 if (!rc && mfs < old_mfs)
680 fc_lport_enter_reset(lport);
682 mutex_unlock(&lport->lp_mutex);
686 EXPORT_SYMBOL(fc_set_mfs);
689 * fc_lport_disc_callback() - Callback for discovery events
690 * @lport: The local port receiving the event
691 * @event: The discovery event
693 static void fc_lport_disc_callback(struct fc_lport *lport,
694 enum fc_disc_event event)
697 case DISC_EV_SUCCESS:
698 FC_LPORT_DBG(lport, "Discovery succeeded\n");
701 printk(KERN_ERR "host%d: libfc: "
702 "Discovery failed for port (%6.6x)\n",
703 lport->host->host_no, lport->port_id);
704 mutex_lock(&lport->lp_mutex);
705 fc_lport_enter_reset(lport);
706 mutex_unlock(&lport->lp_mutex);
715 * fc_rport_enter_ready() - Enter the ready state and start discovery
716 * @lport: The local port that is ready
718 * Locking Note: The lport lock is expected to be held before calling
721 static void fc_lport_enter_ready(struct fc_lport *lport)
723 FC_LPORT_DBG(lport, "Entered READY from state %s\n",
724 fc_lport_state(lport));
726 fc_lport_state_enter(lport, LPORT_ST_READY);
728 fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
729 fc_vports_linkchange(lport);
731 if (!lport->ptp_rdata)
732 lport->tt.disc_start(fc_lport_disc_callback, lport);
736 * fc_lport_set_port_id() - set the local port Port ID
737 * @lport: The local port which will have its Port ID set.
738 * @port_id: The new port ID.
739 * @fp: The frame containing the incoming request, or NULL.
741 * Locking Note: The lport lock is expected to be held before calling
744 static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
748 printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
749 lport->host->host_no, port_id);
751 lport->port_id = port_id;
753 /* Update the fc_host */
754 fc_host_port_id(lport->host) = port_id;
756 if (lport->tt.lport_set_port_id)
757 lport->tt.lport_set_port_id(lport, port_id, fp);
761 * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint
762 * @lport: The local port which will have its Port ID set.
763 * @port_id: The new port ID.
765 * Called by the lower-level driver when transport sets the local port_id.
766 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
767 * discovery to be skipped.
769 void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
771 mutex_lock(&lport->lp_mutex);
773 fc_lport_set_port_id(lport, port_id, NULL);
775 switch (lport->state) {
779 fc_lport_enter_ready(lport);
784 mutex_unlock(&lport->lp_mutex);
786 EXPORT_SYMBOL(fc_lport_set_local_id);
789 * fc_lport_recv_flogi_req() - Receive a FLOGI request
790 * @lport: The local port that received the request
791 * @rx_fp: The FLOGI frame
793 * A received FLOGI request indicates a point-to-point connection.
794 * Accept it with the common service parameters indicating our N port.
795 * Set up to do a PLOGI if we have the higher-number WWPN.
797 * Locking Note: The lport lock is expected to be held before calling
800 static void fc_lport_recv_flogi_req(struct fc_lport *lport,
801 struct fc_frame *rx_fp)
804 struct fc_frame_header *fh;
805 struct fc_els_flogi *flp;
806 struct fc_els_flogi *new_flp;
811 FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
812 fc_lport_state(lport));
814 remote_fid = fc_frame_sid(rx_fp);
815 flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
818 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
819 if (remote_wwpn == lport->wwpn) {
820 printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
821 "with same WWPN %16.16llx\n",
822 lport->host->host_no, remote_wwpn);
825 FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);
828 * XXX what is the right thing to do for FIDs?
829 * The originator might expect our S_ID to be 0xfffffe.
830 * But if so, both of us could end up with the same FID.
832 local_fid = FC_LOCAL_PTP_FID_LO;
833 if (remote_wwpn < lport->wwpn) {
834 local_fid = FC_LOCAL_PTP_FID_HI;
835 if (!remote_fid || remote_fid == local_fid)
836 remote_fid = FC_LOCAL_PTP_FID_LO;
837 } else if (!remote_fid) {
838 remote_fid = FC_LOCAL_PTP_FID_HI;
841 fc_lport_set_port_id(lport, local_fid, rx_fp);
843 fp = fc_frame_alloc(lport, sizeof(*flp));
845 new_flp = fc_frame_payload_get(fp, sizeof(*flp));
846 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
847 new_flp->fl_cmd = (u8) ELS_LS_ACC;
850 * Send the response. If this fails, the originator should
851 * repeat the sequence.
853 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
854 fh = fc_frame_header_get(fp);
855 hton24(fh->fh_s_id, local_fid);
856 hton24(fh->fh_d_id, remote_fid);
857 lport->tt.frame_send(lport, fp);
860 fc_lport_error(lport, fp);
862 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
863 get_unaligned_be64(&flp->fl_wwnn));
865 fc_frame_free(rx_fp);
869 * fc_lport_recv_els_req() - The generic lport ELS request handler
870 * @lport: The local port that received the request
871 * @fp: The request frame
873 * This function will see if the lport handles the request or
874 * if an rport should handle the request.
876 * Locking Note: This function should not be called with the lport
877 * lock held because it will grab the lock.
879 static void fc_lport_recv_els_req(struct fc_lport *lport,
882 void (*recv)(struct fc_lport *, struct fc_frame *);
884 mutex_lock(&lport->lp_mutex);
887 * Handle special ELS cases like FLOGI, LOGO, and
888 * RSCN here. These don't require a session.
889 * Even if we had a session, it might not be ready.
897 recv = lport->tt.rport_recv_req;
898 switch (fc_frame_payload_op(fp)) {
900 if (!lport->point_to_multipoint)
901 recv = fc_lport_recv_flogi_req;
904 if (fc_frame_sid(fp) == FC_FID_FLOGI)
905 recv = fc_lport_recv_logo_req;
908 recv = lport->tt.disc_recv_req;
911 recv = fc_lport_recv_echo_req;
914 recv = fc_lport_recv_rlir_req;
917 recv = fc_lport_recv_rnid_req;
923 mutex_unlock(&lport->lp_mutex);
926 static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
927 const struct fc_els_spp *spp_in,
928 struct fc_els_spp *spp_out)
930 return FC_SPP_RESP_INVL;
933 struct fc4_prov fc_lport_els_prov = {
934 .prli = fc_lport_els_prli,
935 .recv = fc_lport_recv_els_req,
939 * fc_lport_recv_req() - The generic lport request handler
940 * @lport: The lport that received the request
941 * @fp: The frame the request is in
943 * Locking Note: This function should not be called with the lport
944 * lock held because it may grab the lock.
946 static void fc_lport_recv_req(struct fc_lport *lport,
949 struct fc_frame_header *fh = fc_frame_header_get(fp);
950 struct fc_seq *sp = fr_seq(fp);
951 struct fc4_prov *prov;
954 * Use RCU read lock and module_lock to be sure module doesn't
955 * deregister and get unloaded while we're calling it.
956 * try_module_get() is inlined and accepts a NULL parameter.
957 * Only ELSes and FCP target ops should come through here.
958 * The locking is unfortunate, and a better scheme is being sought.
962 if (fh->fh_type >= FC_FC4_PROV_SIZE)
964 prov = rcu_dereference(fc_passive_prov[fh->fh_type]);
965 if (!prov || !try_module_get(prov->module))
968 prov->recv(lport, fp);
969 module_put(prov->module);
973 FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
975 lport->tt.exch_done(sp);
979 * fc_lport_reset() - Reset a local port
980 * @lport: The local port which should be reset
982 * Locking Note: This functions should not be called with the
985 int fc_lport_reset(struct fc_lport *lport)
987 cancel_delayed_work_sync(&lport->retry_work);
988 mutex_lock(&lport->lp_mutex);
989 fc_lport_enter_reset(lport);
990 mutex_unlock(&lport->lp_mutex);
993 EXPORT_SYMBOL(fc_lport_reset);
996 * fc_lport_reset_locked() - Reset the local port w/ the lport lock held
997 * @lport: The local port to be reset
999 * Locking Note: The lport lock is expected to be held before calling
1002 static void fc_lport_reset_locked(struct fc_lport *lport)
1004 if (lport->dns_rdata)
1005 lport->tt.rport_logoff(lport->dns_rdata);
1007 if (lport->ptp_rdata) {
1008 lport->tt.rport_logoff(lport->ptp_rdata);
1009 kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
1010 lport->ptp_rdata = NULL;
1013 lport->tt.disc_stop(lport);
1015 lport->tt.exch_mgr_reset(lport, 0, 0);
1016 fc_host_fabric_name(lport->host) = 0;
1018 if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
1019 fc_lport_set_port_id(lport, 0, NULL);
1023 * fc_lport_enter_reset() - Reset the local port
1024 * @lport: The local port to be reset
1026 * Locking Note: The lport lock is expected to be held before calling
1029 static void fc_lport_enter_reset(struct fc_lport *lport)
1031 FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
1032 fc_lport_state(lport));
1034 if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
1039 fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
1041 fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
1043 fc_lport_state_enter(lport, LPORT_ST_RESET);
1044 fc_host_post_event(lport->host, fc_get_event_number(),
1045 FCH_EVT_LIPRESET, 0);
1046 fc_vports_linkchange(lport);
1047 fc_lport_reset_locked(lport);
1049 fc_lport_enter_flogi(lport);
1053 * fc_lport_enter_disabled() - Disable the local port
1054 * @lport: The local port to be reset
1056 * Locking Note: The lport lock is expected to be held before calling
1059 static void fc_lport_enter_disabled(struct fc_lport *lport)
1061 FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
1062 fc_lport_state(lport));
1064 fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1065 fc_vports_linkchange(lport);
1066 fc_lport_reset_locked(lport);
1070 * fc_lport_error() - Handler for any errors
1071 * @lport: The local port that the error was on
1072 * @fp: The error code encoded in a frame pointer
1074 * If the error was caused by a resource allocation failure
1075 * then wait for half a second and retry, otherwise retry
1076 * after the e_d_tov time.
1078 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
1080 unsigned long delay = 0;
1081 FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
1082 PTR_ERR(fp), fc_lport_state(lport),
1083 lport->retry_count);
1085 if (PTR_ERR(fp) == -FC_EX_CLOSED)
1089 * Memory allocation failure, or the exchange timed out
1090 * or we received LS_RJT.
1093 if (lport->retry_count < lport->max_retry_count) {
1094 lport->retry_count++;
1096 delay = msecs_to_jiffies(500);
1098 delay = msecs_to_jiffies(lport->e_d_tov);
1100 schedule_delayed_work(&lport->retry_work, delay);
1102 fc_lport_enter_reset(lport);
1106 * fc_lport_ns_resp() - Handle response to a name server
1107 * registration exchange
1108 * @sp: current sequence in exchange
1109 * @fp: response frame
1110 * @lp_arg: Fibre Channel host port instance
1112 * Locking Note: This function will be called without the lport lock
1113 * held, but it will lock, call an _enter_* function or fc_lport_error()
1114 * and then unlock the lport.
1116 static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp,
1119 struct fc_lport *lport = lp_arg;
1120 struct fc_frame_header *fh;
1121 struct fc_ct_hdr *ct;
1123 FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp));
1125 if (fp == ERR_PTR(-FC_EX_CLOSED))
1128 mutex_lock(&lport->lp_mutex);
1130 if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
1131 FC_LPORT_DBG(lport, "Received a name server response, "
1132 "but in state %s\n", fc_lport_state(lport));
1139 fc_lport_error(lport, fp);
1143 fh = fc_frame_header_get(fp);
1144 ct = fc_frame_payload_get(fp, sizeof(*ct));
1146 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1147 ct->ct_fs_type == FC_FST_DIR &&
1148 ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1149 ntohs(ct->ct_cmd) == FC_FS_ACC)
1150 switch (lport->state) {
1151 case LPORT_ST_RNN_ID:
1152 fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
1154 case LPORT_ST_RSNN_NN:
1155 fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
1157 case LPORT_ST_RSPN_ID:
1158 fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1160 case LPORT_ST_RFT_ID:
1161 fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
1163 case LPORT_ST_RFF_ID:
1164 if (lport->fdmi_enabled)
1165 fc_lport_enter_fdmi(lport);
1167 fc_lport_enter_scr(lport);
1170 /* should have already been caught by state checks */
1174 fc_lport_error(lport, fp);
1178 mutex_unlock(&lport->lp_mutex);
1182 * fc_lport_ms_resp() - Handle response to a management server
1184 * @sp: current sequence in exchange
1185 * @fp: response frame
1186 * @lp_arg: Fibre Channel host port instance
1188 * Locking Note: This function will be called without the lport lock
1189 * held, but it will lock, call an _enter_* function or fc_lport_error()
1190 * and then unlock the lport.
1192 static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp,
1195 struct fc_lport *lport = lp_arg;
1196 struct fc_frame_header *fh;
1197 struct fc_ct_hdr *ct;
1199 FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp));
1201 if (fp == ERR_PTR(-FC_EX_CLOSED))
1204 mutex_lock(&lport->lp_mutex);
1206 if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) {
1207 FC_LPORT_DBG(lport, "Received a management server response, "
1208 "but in state %s\n", fc_lport_state(lport));
1215 fc_lport_error(lport, fp);
1219 fh = fc_frame_header_get(fp);
1220 ct = fc_frame_payload_get(fp, sizeof(*ct));
1222 if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1223 ct->ct_fs_type == FC_FST_MGMT &&
1224 ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
1225 FC_LPORT_DBG(lport, "Received a management server response, "
1226 "reason=%d explain=%d\n",
1230 switch (lport->state) {
1232 if (ntohs(ct->ct_cmd) == FC_FS_ACC)
1233 fc_lport_enter_ms(lport, LPORT_ST_RPA);
1234 else /* Error Skip RPA */
1235 fc_lport_enter_scr(lport);
1238 fc_lport_enter_scr(lport);
1241 fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1244 fc_lport_enter_ms(lport, LPORT_ST_DPRT);
1247 /* should have already been caught by state checks */
1251 /* Invalid Frame? */
1252 fc_lport_error(lport, fp);
1257 mutex_unlock(&lport->lp_mutex);
1261 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
1262 * @sp: current sequence in SCR exchange
1263 * @fp: response frame
1264 * @lp_arg: Fibre Channel lport port instance that sent the registration request
1266 * Locking Note: This function will be called without the lport lock
1267 * held, but it will lock, call an _enter_* function or fc_lport_error
1268 * and then unlock the lport.
1270 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1273 struct fc_lport *lport = lp_arg;
1276 FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));
1278 if (fp == ERR_PTR(-FC_EX_CLOSED))
1281 mutex_lock(&lport->lp_mutex);
1283 if (lport->state != LPORT_ST_SCR) {
1284 FC_LPORT_DBG(lport, "Received a SCR response, but in state "
1285 "%s\n", fc_lport_state(lport));
1292 fc_lport_error(lport, fp);
1296 op = fc_frame_payload_op(fp);
1297 if (op == ELS_LS_ACC)
1298 fc_lport_enter_ready(lport);
1300 fc_lport_error(lport, fp);
1305 mutex_unlock(&lport->lp_mutex);
1309 * fc_lport_enter_scr() - Send a SCR (State Change Register) request
1310 * @lport: The local port to register for state changes
1312 * Locking Note: The lport lock is expected to be held before calling
1315 static void fc_lport_enter_scr(struct fc_lport *lport)
1317 struct fc_frame *fp;
1319 FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
1320 fc_lport_state(lport));
1322 fc_lport_state_enter(lport, LPORT_ST_SCR);
1324 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1326 fc_lport_error(lport, fp);
1330 if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
1331 fc_lport_scr_resp, lport,
1332 2 * lport->r_a_tov))
1333 fc_lport_error(lport, NULL);
1337 * fc_lport_enter_ns() - register some object with the name server
1338 * @lport: Fibre Channel local port to register
1340 * Locking Note: The lport lock is expected to be held before calling
1343 static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
1345 struct fc_frame *fp;
1347 int size = sizeof(struct fc_ct_hdr);
1350 FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1351 fc_lport_state_names[state],
1352 fc_lport_state(lport));
1354 fc_lport_state_enter(lport, state);
1357 case LPORT_ST_RNN_ID:
1359 size += sizeof(struct fc_ns_rn_id);
1361 case LPORT_ST_RSNN_NN:
1362 len = strnlen(fc_host_symbolic_name(lport->host), 255);
1363 /* if there is no symbolic name, skip to RFT_ID */
1365 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1366 cmd = FC_NS_RSNN_NN;
1367 size += sizeof(struct fc_ns_rsnn) + len;
1369 case LPORT_ST_RSPN_ID:
1370 len = strnlen(fc_host_symbolic_name(lport->host), 255);
1371 /* if there is no symbolic name, skip to RFT_ID */
1373 return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1374 cmd = FC_NS_RSPN_ID;
1375 size += sizeof(struct fc_ns_rspn) + len;
1377 case LPORT_ST_RFT_ID:
1379 size += sizeof(struct fc_ns_rft);
1381 case LPORT_ST_RFF_ID:
1383 size += sizeof(struct fc_ns_rff_id);
1386 fc_lport_error(lport, NULL);
1390 fp = fc_frame_alloc(lport, size);
1392 fc_lport_error(lport, fp);
1396 if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
1398 lport, 3 * lport->r_a_tov))
1399 fc_lport_error(lport, fp);
1402 static struct fc_rport_operations fc_lport_rport_ops = {
1403 .event_callback = fc_lport_rport_callback,
1407 * fc_rport_enter_dns() - Create a fc_rport for the name server
1408 * @lport: The local port requesting a remote port for the name server
1410 * Locking Note: The lport lock is expected to be held before calling
1413 static void fc_lport_enter_dns(struct fc_lport *lport)
1415 struct fc_rport_priv *rdata;
1417 FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
1418 fc_lport_state(lport));
1420 fc_lport_state_enter(lport, LPORT_ST_DNS);
1422 mutex_lock(&lport->disc.disc_mutex);
1423 rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV);
1424 mutex_unlock(&lport->disc.disc_mutex);
1428 rdata->ops = &fc_lport_rport_ops;
1429 lport->tt.rport_login(rdata);
1433 fc_lport_error(lport, NULL);
1437 * fc_lport_enter_ms() - management server commands
1438 * @lport: Fibre Channel local port to register
1440 * Locking Note: The lport lock is expected to be held before calling
1443 static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
1445 struct fc_frame *fp;
1446 enum fc_fdmi_req cmd;
1447 int size = sizeof(struct fc_ct_hdr);
1451 FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1452 fc_lport_state_names[state],
1453 fc_lport_state(lport));
1455 fc_lport_state_enter(lport, state);
1460 /* Number of HBA Attributes */
1462 len = sizeof(struct fc_fdmi_rhba);
1463 len -= sizeof(struct fc_fdmi_attr_entry);
1464 len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1465 len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
1466 len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
1467 len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
1468 len += FC_FDMI_HBA_ATTR_MODEL_LEN;
1469 len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
1470 len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
1471 len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
1472 len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
1473 len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
1474 len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
1480 /* Number of Port Attributes */
1482 len = sizeof(struct fc_fdmi_rpa);
1483 len -= sizeof(struct fc_fdmi_attr_entry);
1484 len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1485 len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
1486 len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
1487 len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
1488 len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
1489 len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
1490 len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
1496 len = sizeof(struct fc_fdmi_dprt);
1501 len = sizeof(struct fc_fdmi_dhba);
1505 fc_lport_error(lport, NULL);
1509 FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
1510 cmd, (int)len, size);
1511 fp = fc_frame_alloc(lport, size);
1513 fc_lport_error(lport, fp);
1517 if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
1519 lport, 3 * lport->r_a_tov))
1520 fc_lport_error(lport, fp);
1524 * fc_rport_enter_fdmi() - Create a fc_rport for the management server
1525 * @lport: The local port requesting a remote port for the management server
1527 * Locking Note: The lport lock is expected to be held before calling
1530 static void fc_lport_enter_fdmi(struct fc_lport *lport)
1532 struct fc_rport_priv *rdata;
1534 FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
1535 fc_lport_state(lport));
1537 fc_lport_state_enter(lport, LPORT_ST_FDMI);
1539 mutex_lock(&lport->disc.disc_mutex);
1540 rdata = lport->tt.rport_create(lport, FC_FID_MGMT_SERV);
1541 mutex_unlock(&lport->disc.disc_mutex);
1545 rdata->ops = &fc_lport_rport_ops;
1546 lport->tt.rport_login(rdata);
1550 fc_lport_error(lport, NULL);
1554 * fc_lport_timeout() - Handler for the retry_work timer
1555 * @work: The work struct of the local port
1557 static void fc_lport_timeout(struct work_struct *work)
1559 struct fc_lport *lport =
1560 container_of(work, struct fc_lport,
1563 mutex_lock(&lport->lp_mutex);
1565 switch (lport->state) {
1566 case LPORT_ST_DISABLED:
1569 case LPORT_ST_READY:
1571 case LPORT_ST_RESET:
1573 case LPORT_ST_FLOGI:
1574 fc_lport_enter_flogi(lport);
1577 fc_lport_enter_dns(lport);
1579 case LPORT_ST_RNN_ID:
1580 case LPORT_ST_RSNN_NN:
1581 case LPORT_ST_RSPN_ID:
1582 case LPORT_ST_RFT_ID:
1583 case LPORT_ST_RFF_ID:
1584 fc_lport_enter_ns(lport, lport->state);
1587 fc_lport_enter_fdmi(lport);
1593 fc_lport_enter_ms(lport, lport->state);
1596 fc_lport_enter_scr(lport);
1599 fc_lport_enter_logo(lport);
1603 mutex_unlock(&lport->lp_mutex);
1607 * fc_lport_logo_resp() - Handle response to LOGO request
1608 * @sp: The sequence that the LOGO was on
1609 * @fp: The LOGO frame
1610 * @lp_arg: The lport port that received the LOGO request
1612 * Locking Note: This function will be called without the lport lock
1613 * held, but it will lock, call an _enter_* function or fc_lport_error()
1614 * and then unlock the lport.
1616 void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1619 struct fc_lport *lport = lp_arg;
1622 FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));
1624 if (fp == ERR_PTR(-FC_EX_CLOSED))
1627 mutex_lock(&lport->lp_mutex);
1629 if (lport->state != LPORT_ST_LOGO) {
1630 FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
1631 "%s\n", fc_lport_state(lport));
1638 fc_lport_error(lport, fp);
1642 op = fc_frame_payload_op(fp);
1643 if (op == ELS_LS_ACC)
1644 fc_lport_enter_disabled(lport);
1646 fc_lport_error(lport, fp);
1651 mutex_unlock(&lport->lp_mutex);
1653 EXPORT_SYMBOL(fc_lport_logo_resp);
1656 * fc_rport_enter_logo() - Logout of the fabric
1657 * @lport: The local port to be logged out
1659 * Locking Note: The lport lock is expected to be held before calling
1662 static void fc_lport_enter_logo(struct fc_lport *lport)
1664 struct fc_frame *fp;
1665 struct fc_els_logo *logo;
1667 FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
1668 fc_lport_state(lport));
1670 fc_lport_state_enter(lport, LPORT_ST_LOGO);
1671 fc_vports_linkchange(lport);
1673 fp = fc_frame_alloc(lport, sizeof(*logo));
1675 fc_lport_error(lport, fp);
1679 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
1680 fc_lport_logo_resp, lport,
1681 2 * lport->r_a_tov))
1682 fc_lport_error(lport, NULL);
1686 * fc_lport_flogi_resp() - Handle response to FLOGI request
1687 * @sp: The sequence that the FLOGI was on
1688 * @fp: The FLOGI response frame
1689 * @lp_arg: The lport port that received the FLOGI response
1691 * Locking Note: This function will be called without the lport lock
1692 * held, but it will lock, call an _enter_* function or fc_lport_error()
1693 * and then unlock the lport.
1695 void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1698 struct fc_lport *lport = lp_arg;
1699 struct fc_frame_header *fh;
1700 struct fc_els_flogi *flp;
1703 unsigned int r_a_tov;
1704 unsigned int e_d_tov;
1707 FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));
1709 if (fp == ERR_PTR(-FC_EX_CLOSED))
1712 mutex_lock(&lport->lp_mutex);
1714 if (lport->state != LPORT_ST_FLOGI) {
1715 FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
1716 "%s\n", fc_lport_state(lport));
1723 fc_lport_error(lport, fp);
1727 fh = fc_frame_header_get(fp);
1728 did = fc_frame_did(fp);
1729 if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
1730 fc_frame_payload_op(fp) != ELS_LS_ACC) {
1731 FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
1732 fc_lport_error(lport, fp);
1736 flp = fc_frame_payload_get(fp, sizeof(*flp));
1738 FC_LPORT_DBG(lport, "FLOGI bad response\n");
1739 fc_lport_error(lport, fp);
1743 mfs = ntohs(flp->fl_csp.sp_bb_data) &
1745 if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
1746 mfs <= lport->mfs) {
1748 fc_host_maxframe_size(lport->host) = mfs;
1750 FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
1751 "lport->mfs:%hu\n", mfs, lport->mfs);
1752 fc_lport_error(lport, fp);
1756 csp_flags = ntohs(flp->fl_csp.sp_features);
1757 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1758 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1759 if (csp_flags & FC_SP_FT_EDTR)
1762 lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);
1764 if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1765 if (e_d_tov > lport->e_d_tov)
1766 lport->e_d_tov = e_d_tov;
1767 lport->r_a_tov = 2 * e_d_tov;
1768 fc_lport_set_port_id(lport, did, fp);
1769 printk(KERN_INFO "host%d: libfc: "
1770 "Port (%6.6x) entered "
1771 "point-to-point mode\n",
1772 lport->host->host_no, did);
1773 fc_lport_ptp_setup(lport, fc_frame_sid(fp),
1779 lport->e_d_tov = e_d_tov;
1780 lport->r_a_tov = r_a_tov;
1781 fc_host_fabric_name(lport->host) =
1782 get_unaligned_be64(&flp->fl_wwnn);
1783 fc_lport_set_port_id(lport, did, fp);
1784 fc_lport_enter_dns(lport);
1790 mutex_unlock(&lport->lp_mutex);
1792 EXPORT_SYMBOL(fc_lport_flogi_resp);
1795 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
1796 * @lport: Fibre Channel local port to be logged in to the fabric
1798 * Locking Note: The lport lock is expected to be held before calling
1801 static void fc_lport_enter_flogi(struct fc_lport *lport)
1803 struct fc_frame *fp;
1805 FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
1806 fc_lport_state(lport));
1808 fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1810 if (lport->point_to_multipoint) {
1812 fc_lport_enter_ready(lport);
1816 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1818 return fc_lport_error(lport, fp);
1820 if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp,
1821 lport->vport ? ELS_FDISC : ELS_FLOGI,
1822 fc_lport_flogi_resp, lport,
1823 lport->vport ? 2 * lport->r_a_tov :
1825 fc_lport_error(lport, NULL);
1829 * fc_lport_config() - Configure a fc_lport
1830 * @lport: The local port to be configured
1832 int fc_lport_config(struct fc_lport *lport)
1834 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1835 mutex_init(&lport->lp_mutex);
1837 fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1839 fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1840 fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1841 fc_fc4_conf_lport_params(lport, FC_TYPE_FCP);
1845 EXPORT_SYMBOL(fc_lport_config);
1848 * fc_lport_init() - Initialize the lport layer for a local port
1849 * @lport: The local port to initialize the exchange layer for
1851 int fc_lport_init(struct fc_lport *lport)
1853 if (!lport->tt.lport_recv)
1854 lport->tt.lport_recv = fc_lport_recv_req;
1856 if (!lport->tt.lport_reset)
1857 lport->tt.lport_reset = fc_lport_reset;
1859 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
1860 fc_host_node_name(lport->host) = lport->wwnn;
1861 fc_host_port_name(lport->host) = lport->wwpn;
1862 fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
1863 memset(fc_host_supported_fc4s(lport->host), 0,
1864 sizeof(fc_host_supported_fc4s(lport->host)));
1865 fc_host_supported_fc4s(lport->host)[2] = 1;
1866 fc_host_supported_fc4s(lport->host)[7] = 1;
1868 /* This value is also unchanging */
1869 memset(fc_host_active_fc4s(lport->host), 0,
1870 sizeof(fc_host_active_fc4s(lport->host)));
1871 fc_host_active_fc4s(lport->host)[2] = 1;
1872 fc_host_active_fc4s(lport->host)[7] = 1;
1873 fc_host_maxframe_size(lport->host) = lport->mfs;
1874 fc_host_supported_speeds(lport->host) = 0;
1875 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
1876 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
1877 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
1878 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
1879 fc_fc4_add_lport(lport);
1883 EXPORT_SYMBOL(fc_lport_init);
1886 * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests
1887 * @sp: The sequence for the FC Passthrough response
1888 * @fp: The response frame
1889 * @info_arg: The BSG info that the response is for
1891 static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
1894 struct fc_bsg_info *info = info_arg;
1895 struct fc_bsg_job *job = info->job;
1896 struct fc_lport *lport = info->lport;
1897 struct fc_frame_header *fh;
1902 job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
1903 -ECONNABORTED : -ETIMEDOUT;
1904 job->reply_len = sizeof(uint32_t);
1905 job->state_flags |= FC_RQST_STATE_DONE;
1911 mutex_lock(&lport->lp_mutex);
1912 fh = fc_frame_header_get(fp);
1913 len = fr_len(fp) - sizeof(*fh);
1914 buf = fc_frame_payload_get(fp, 0);
1916 if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
1917 /* Get the response code from the first frame payload */
1918 unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
1919 ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
1920 (unsigned short)fc_frame_payload_op(fp);
1922 /* Save the reply status of the job */
1923 job->reply->reply_data.ctels_reply.status =
1924 (cmd == info->rsp_code) ?
1925 FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
1928 job->reply->reply_payload_rcv_len +=
1929 fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
1930 &info->offset, NULL);
1932 if (fr_eof(fp) == FC_EOF_T &&
1933 (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1934 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1935 if (job->reply->reply_payload_rcv_len >
1936 job->reply_payload.payload_len)
1937 job->reply->reply_payload_rcv_len =
1938 job->reply_payload.payload_len;
1939 job->reply->result = 0;
1940 job->state_flags |= FC_RQST_STATE_DONE;
1945 mutex_unlock(&lport->lp_mutex);
1949 * fc_lport_els_request() - Send ELS passthrough request
1950 * @job: The BSG Passthrough job
1951 * @lport: The local port sending the request
1952 * @did: The destination port id
1954 * Locking Note: The lport lock is expected to be held before calling
1957 static int fc_lport_els_request(struct fc_bsg_job *job,
1958 struct fc_lport *lport,
1961 struct fc_bsg_info *info;
1962 struct fc_frame *fp;
1963 struct fc_frame_header *fh;
1967 fp = fc_frame_alloc(lport, job->request_payload.payload_len);
1971 len = job->request_payload.payload_len;
1972 pp = fc_frame_payload_get(fp, len);
1974 sg_copy_to_buffer(job->request_payload.sg_list,
1975 job->request_payload.sg_cnt,
1978 fh = fc_frame_header_get(fp);
1979 fh->fh_r_ctl = FC_RCTL_ELS_REQ;
1980 hton24(fh->fh_d_id, did);
1981 hton24(fh->fh_s_id, lport->port_id);
1982 fh->fh_type = FC_TYPE_ELS;
1983 hton24(fh->fh_f_ctl, FC_FCTL_REQ);
1986 fh->fh_parm_offset = 0;
1988 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
1995 info->lport = lport;
1996 info->rsp_code = ELS_LS_ACC;
1997 info->nents = job->reply_payload.sg_cnt;
1998 info->sg = job->reply_payload.sg_list;
2000 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2009 * fc_lport_ct_request() - Send CT Passthrough request
2010 * @job: The BSG Passthrough job
2011 * @lport: The local port sending the request
2012 * @did: The destination FC-ID
2013 * @tov: The timeout period to wait for the response
2015 * Locking Note: The lport lock is expected to be held before calling
2018 static int fc_lport_ct_request(struct fc_bsg_job *job,
2019 struct fc_lport *lport, u32 did, u32 tov)
2021 struct fc_bsg_info *info;
2022 struct fc_frame *fp;
2023 struct fc_frame_header *fh;
2024 struct fc_ct_req *ct;
2027 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
2028 job->request_payload.payload_len);
2032 len = job->request_payload.payload_len;
2033 ct = fc_frame_payload_get(fp, len);
2035 sg_copy_to_buffer(job->request_payload.sg_list,
2036 job->request_payload.sg_cnt,
2039 fh = fc_frame_header_get(fp);
2040 fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
2041 hton24(fh->fh_d_id, did);
2042 hton24(fh->fh_s_id, lport->port_id);
2043 fh->fh_type = FC_TYPE_CT;
2044 hton24(fh->fh_f_ctl, FC_FCTL_REQ);
2047 fh->fh_parm_offset = 0;
2049 info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2056 info->lport = lport;
2057 info->rsp_code = FC_FS_ACC;
2058 info->nents = job->reply_payload.sg_cnt;
2059 info->sg = job->reply_payload.sg_list;
2061 if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
2070 * fc_lport_bsg_request() - The common entry point for sending
2071 * FC Passthrough requests
2072 * @job: The BSG passthrough job
2074 int fc_lport_bsg_request(struct fc_bsg_job *job)
2076 struct request *rsp = job->req->next_rq;
2077 struct Scsi_Host *shost = job->shost;
2078 struct fc_lport *lport = shost_priv(shost);
2079 struct fc_rport *rport;
2080 struct fc_rport_priv *rdata;
2084 job->reply->reply_payload_rcv_len = 0;
2086 rsp->resid_len = job->reply_payload.payload_len;
2088 mutex_lock(&lport->lp_mutex);
2090 switch (job->request->msgcode) {
2091 case FC_BSG_RPT_ELS:
2096 rdata = rport->dd_data;
2097 rc = fc_lport_els_request(job, lport, rport->port_id,
2106 rdata = rport->dd_data;
2107 rc = fc_lport_ct_request(job, lport, rport->port_id,
2112 did = ntoh24(job->request->rqst_data.h_ct.port_id);
2113 if (did == FC_FID_DIR_SERV)
2114 rdata = lport->dns_rdata;
2116 rdata = lport->tt.rport_lookup(lport, did);
2121 rc = fc_lport_ct_request(job, lport, did, rdata->e_d_tov);
2124 case FC_BSG_HST_ELS_NOLOGIN:
2125 did = ntoh24(job->request->rqst_data.h_els.port_id);
2126 rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
2130 mutex_unlock(&lport->lp_mutex);
2133 EXPORT_SYMBOL(fc_lport_bsg_request);