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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.4 *5 * Maintained at www.Open-FCoE.org6 */7 8/*9 * Target Discovery10 *11 * This block discovers all FC-4 remote ports, including FCP initiators. It12 * also handles RSCN events and re-discovery if necessary.13 */14 15/*16 * DISC LOCKING17 *18 * The disc mutex is can be locked when acquiring rport locks, but may not19 * be held when acquiring the lport lock. Refer to fc_lport.c for more20 * details.21 */22 23#include <linux/timer.h>24#include <linux/slab.h>25#include <linux/err.h>26#include <linux/export.h>27#include <linux/list.h>28 29#include <linux/unaligned.h>30 31#include <scsi/fc/fc_gs.h>32 33#include <scsi/libfc.h>34 35#include "fc_libfc.h"36 37#define FC_DISC_RETRY_LIMIT 3 /* max retries */38#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */39 40static void fc_disc_gpn_ft_req(struct fc_disc *);41static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);42static void fc_disc_done(struct fc_disc *, enum fc_disc_event);43static void fc_disc_timeout(struct work_struct *);44static int fc_disc_single(struct fc_lport *, struct fc_disc_port *);45static void fc_disc_restart(struct fc_disc *);46 47/**48 * fc_disc_stop_rports() - Delete all the remote ports associated with the lport49 * @disc: The discovery job to stop remote ports on50 */51static void fc_disc_stop_rports(struct fc_disc *disc)52{53 struct fc_rport_priv *rdata;54 55 lockdep_assert_held(&disc->disc_mutex);56 57 list_for_each_entry(rdata, &disc->rports, peers) {58 if (kref_get_unless_zero(&rdata->kref)) {59 fc_rport_logoff(rdata);60 kref_put(&rdata->kref, fc_rport_destroy);61 }62 }63}64 65/**66 * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN)67 * @disc: The discovery object to which the RSCN applies68 * @fp: The RSCN frame69 */70static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp)71{72 struct fc_lport *lport;73 struct fc_els_rscn *rp;74 struct fc_els_rscn_page *pp;75 struct fc_seq_els_data rjt_data;76 unsigned int len;77 int redisc = 0;78 enum fc_els_rscn_addr_fmt fmt;79 LIST_HEAD(disc_ports);80 struct fc_disc_port *dp, *next;81 82 lockdep_assert_held(&disc->disc_mutex);83 84 lport = fc_disc_lport(disc);85 86 FC_DISC_DBG(disc, "Received an RSCN event\n");87 88 /* make sure the frame contains an RSCN message */89 rp = fc_frame_payload_get(fp, sizeof(*rp));90 if (!rp)91 goto reject;92 /* make sure the page length is as expected (4 bytes) */93 if (rp->rscn_page_len != sizeof(*pp))94 goto reject;95 /* get the RSCN payload length */96 len = ntohs(rp->rscn_plen);97 if (len < sizeof(*rp))98 goto reject;99 /* make sure the frame contains the expected payload */100 rp = fc_frame_payload_get(fp, len);101 if (!rp)102 goto reject;103 /* payload must be a multiple of the RSCN page size */104 len -= sizeof(*rp);105 if (len % sizeof(*pp))106 goto reject;107 108 for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) {109 fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT;110 fmt &= ELS_RSCN_ADDR_FMT_MASK;111 /*112 * if we get an address format other than port113 * (area, domain, fabric), then do a full discovery114 */115 switch (fmt) {116 case ELS_ADDR_FMT_PORT:117 FC_DISC_DBG(disc, "Port address format for port "118 "(%6.6x)\n", ntoh24(pp->rscn_fid));119 dp = kzalloc(sizeof(*dp), GFP_KERNEL);120 if (!dp) {121 redisc = 1;122 break;123 }124 dp->lp = lport;125 dp->port_id = ntoh24(pp->rscn_fid);126 list_add_tail(&dp->peers, &disc_ports);127 break;128 case ELS_ADDR_FMT_AREA:129 case ELS_ADDR_FMT_DOM:130 case ELS_ADDR_FMT_FAB:131 default:132 FC_DISC_DBG(disc, "Address format is (%d)\n", fmt);133 redisc = 1;134 break;135 }136 }137 fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);138 139 /*140 * If not doing a complete rediscovery, do GPN_ID on141 * the individual ports mentioned in the list.142 * If any of these get an error, do a full rediscovery.143 * In any case, go through the list and free the entries.144 */145 list_for_each_entry_safe(dp, next, &disc_ports, peers) {146 list_del(&dp->peers);147 if (!redisc)148 redisc = fc_disc_single(lport, dp);149 kfree(dp);150 }151 if (redisc) {152 FC_DISC_DBG(disc, "RSCN received: rediscovering\n");153 fc_disc_restart(disc);154 } else {155 FC_DISC_DBG(disc, "RSCN received: not rediscovering. "156 "redisc %d state %d in_prog %d\n",157 redisc, lport->state, disc->pending);158 }159 fc_frame_free(fp);160 return;161reject:162 FC_DISC_DBG(disc, "Received a bad RSCN frame\n");163 rjt_data.reason = ELS_RJT_LOGIC;164 rjt_data.explan = ELS_EXPL_NONE;165 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);166 fc_frame_free(fp);167}168 169/**170 * fc_disc_recv_req() - Handle incoming requests171 * @lport: The local port receiving the request172 * @fp: The request frame173 *174 * Locking Note: This function is called from the EM and will lock175 * the disc_mutex before calling the handler for the176 * request.177 */178static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp)179{180 u8 op;181 struct fc_disc *disc = &lport->disc;182 183 op = fc_frame_payload_op(fp);184 switch (op) {185 case ELS_RSCN:186 mutex_lock(&disc->disc_mutex);187 fc_disc_recv_rscn_req(disc, fp);188 mutex_unlock(&disc->disc_mutex);189 break;190 default:191 FC_DISC_DBG(disc, "Received an unsupported request, "192 "the opcode is (%x)\n", op);193 fc_frame_free(fp);194 break;195 }196}197 198/**199 * fc_disc_restart() - Restart discovery200 * @disc: The discovery object to be restarted201 */202static void fc_disc_restart(struct fc_disc *disc)203{204 lockdep_assert_held(&disc->disc_mutex);205 206 if (!disc->disc_callback)207 return;208 209 FC_DISC_DBG(disc, "Restarting discovery\n");210 211 disc->requested = 1;212 if (disc->pending)213 return;214 215 /*216 * Advance disc_id. This is an arbitrary non-zero number that will217 * match the value in the fc_rport_priv after discovery for all218 * freshly-discovered remote ports. Avoid wrapping to zero.219 */220 disc->disc_id = (disc->disc_id + 2) | 1;221 disc->retry_count = 0;222 fc_disc_gpn_ft_req(disc);223}224 225/**226 * fc_disc_start() - Start discovery on a local port227 * @lport: The local port to have discovery started on228 * @disc_callback: Callback function to be called when discovery is complete229 */230static void fc_disc_start(void (*disc_callback)(struct fc_lport *,231 enum fc_disc_event),232 struct fc_lport *lport)233{234 struct fc_disc *disc = &lport->disc;235 236 /*237 * At this point we may have a new disc job or an existing238 * one. Either way, let's lock when we make changes to it239 * and send the GPN_FT request.240 */241 mutex_lock(&disc->disc_mutex);242 disc->disc_callback = disc_callback;243 fc_disc_restart(disc);244 mutex_unlock(&disc->disc_mutex);245}246 247/**248 * fc_disc_done() - Discovery has been completed249 * @disc: The discovery context250 * @event: The discovery completion status251 */252static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)253{254 struct fc_lport *lport = fc_disc_lport(disc);255 struct fc_rport_priv *rdata;256 257 lockdep_assert_held(&disc->disc_mutex);258 FC_DISC_DBG(disc, "Discovery complete\n");259 260 disc->pending = 0;261 if (disc->requested) {262 fc_disc_restart(disc);263 return;264 }265 266 /*267 * Go through all remote ports. If they were found in the latest268 * discovery, reverify or log them in. Otherwise, log them out.269 * Skip ports which were never discovered. These are the dNS port270 * and ports which were created by PLOGI.271 *272 * We don't need to use the _rcu variant here as the rport list273 * is protected by the disc mutex which is already held on entry.274 */275 list_for_each_entry(rdata, &disc->rports, peers) {276 if (!kref_get_unless_zero(&rdata->kref))277 continue;278 if (rdata->disc_id) {279 if (rdata->disc_id == disc->disc_id)280 fc_rport_login(rdata);281 else282 fc_rport_logoff(rdata);283 }284 kref_put(&rdata->kref, fc_rport_destroy);285 }286 mutex_unlock(&disc->disc_mutex);287 disc->disc_callback(lport, event);288 mutex_lock(&disc->disc_mutex);289}290 291/**292 * fc_disc_error() - Handle error on dNS request293 * @disc: The discovery context294 * @fp: The error code encoded as a frame pointer295 */296static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)297{298 struct fc_lport *lport = fc_disc_lport(disc);299 unsigned long delay = 0;300 301 FC_DISC_DBG(disc, "Error %d, retries %d/%d\n",302 PTR_ERR_OR_ZERO(fp), disc->retry_count,303 FC_DISC_RETRY_LIMIT);304 305 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {306 /*307 * Memory allocation failure, or the exchange timed out,308 * retry after delay.309 */310 if (disc->retry_count < FC_DISC_RETRY_LIMIT) {311 /* go ahead and retry */312 if (!fp)313 delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY);314 else {315 delay = msecs_to_jiffies(lport->e_d_tov);316 317 /* timeout faster first time */318 if (!disc->retry_count)319 delay /= 4;320 }321 disc->retry_count++;322 schedule_delayed_work(&disc->disc_work, delay);323 } else324 fc_disc_done(disc, DISC_EV_FAILED);325 } else if (PTR_ERR(fp) == -FC_EX_CLOSED) {326 /*327 * if discovery fails due to lport reset, clear328 * pending flag so that subsequent discovery can329 * continue330 */331 disc->pending = 0;332 }333}334 335/**336 * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request337 * @disc: The discovery context338 */339static void fc_disc_gpn_ft_req(struct fc_disc *disc)340{341 struct fc_frame *fp;342 struct fc_lport *lport = fc_disc_lport(disc);343 344 lockdep_assert_held(&disc->disc_mutex);345 346 WARN_ON(!fc_lport_test_ready(lport));347 348 disc->pending = 1;349 disc->requested = 0;350 351 disc->buf_len = 0;352 disc->seq_count = 0;353 fp = fc_frame_alloc(lport,354 sizeof(struct fc_ct_hdr) +355 sizeof(struct fc_ns_gid_ft));356 if (!fp)357 goto err;358 359 if (lport->tt.elsct_send(lport, 0, fp,360 FC_NS_GPN_FT,361 fc_disc_gpn_ft_resp,362 disc, 3 * lport->r_a_tov))363 return;364err:365 fc_disc_error(disc, NULL);366}367 368/**369 * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response.370 * @disc: The discovery context371 * @buf: The GPN_FT response buffer372 * @len: The size of response buffer373 *374 * Goes through the list of IDs and names resulting from a request.375 */376static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)377{378 struct fc_lport *lport;379 struct fc_gpn_ft_resp *np;380 char *bp;381 size_t plen;382 size_t tlen;383 int error = 0;384 struct fc_rport_identifiers ids;385 struct fc_rport_priv *rdata;386 387 lport = fc_disc_lport(disc);388 disc->seq_count++;389 390 /*391 * Handle partial name record left over from previous call.392 */393 bp = buf;394 plen = len;395 np = (struct fc_gpn_ft_resp *)bp;396 tlen = disc->buf_len;397 disc->buf_len = 0;398 if (tlen) {399 WARN_ON(tlen >= sizeof(*np));400 plen = sizeof(*np) - tlen;401 WARN_ON(plen <= 0);402 WARN_ON(plen >= sizeof(*np));403 if (plen > len)404 plen = len;405 np = &disc->partial_buf;406 memcpy((char *)np + tlen, bp, plen);407 408 /*409 * Set bp so that the loop below will advance it to the410 * first valid full name element.411 */412 bp -= tlen;413 len += tlen;414 plen += tlen;415 disc->buf_len = (unsigned char) plen;416 if (plen == sizeof(*np))417 disc->buf_len = 0;418 }419 420 /*421 * Handle full name records, including the one filled from above.422 * Normally, np == bp and plen == len, but from the partial case above,423 * bp, len describe the overall buffer, and np, plen describe the424 * partial buffer, which if would usually be full now.425 * After the first time through the loop, things return to "normal".426 */427 while (plen >= sizeof(*np)) {428 ids.port_id = ntoh24(np->fp_fid);429 ids.port_name = ntohll(np->fp_wwpn);430 431 if (ids.port_id != lport->port_id &&432 ids.port_name != lport->wwpn) {433 rdata = fc_rport_create(lport, ids.port_id);434 if (rdata) {435 rdata->ids.port_name = ids.port_name;436 rdata->disc_id = disc->disc_id;437 } else {438 printk(KERN_WARNING "libfc: Failed to allocate "439 "memory for the newly discovered port "440 "(%6.6x)\n", ids.port_id);441 error = -ENOMEM;442 }443 }444 445 if (np->fp_flags & FC_NS_FID_LAST) {446 fc_disc_done(disc, DISC_EV_SUCCESS);447 len = 0;448 break;449 }450 len -= sizeof(*np);451 bp += sizeof(*np);452 np = (struct fc_gpn_ft_resp *)bp;453 plen = len;454 }455 456 /*457 * Save any partial record at the end of the buffer for next time.458 */459 if (error == 0 && len > 0 && len < sizeof(*np)) {460 if (np != &disc->partial_buf) {461 FC_DISC_DBG(disc, "Partial buffer remains "462 "for discovery\n");463 memcpy(&disc->partial_buf, np, len);464 }465 disc->buf_len = (unsigned char) len;466 }467 return error;468}469 470/**471 * fc_disc_timeout() - Handler for discovery timeouts472 * @work: Structure holding discovery context that needs to retry discovery473 */474static void fc_disc_timeout(struct work_struct *work)475{476 struct fc_disc *disc = container_of(work,477 struct fc_disc,478 disc_work.work);479 mutex_lock(&disc->disc_mutex);480 fc_disc_gpn_ft_req(disc);481 mutex_unlock(&disc->disc_mutex);482}483 484/**485 * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT)486 * @sp: The sequence that the GPN_FT response was received on487 * @fp: The GPN_FT response frame488 * @disc_arg: The discovery context489 *490 * Locking Note: This function is called without disc mutex held, and491 * should do all its processing with the mutex held492 */493static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,494 void *disc_arg)495{496 struct fc_disc *disc = disc_arg;497 struct fc_ct_hdr *cp;498 struct fc_frame_header *fh;499 enum fc_disc_event event = DISC_EV_NONE;500 unsigned int seq_cnt;501 unsigned int len;502 int error = 0;503 504 mutex_lock(&disc->disc_mutex);505 FC_DISC_DBG(disc, "Received a GPN_FT response\n");506 507 if (IS_ERR(fp)) {508 fc_disc_error(disc, fp);509 mutex_unlock(&disc->disc_mutex);510 return;511 }512 513 WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */514 fh = fc_frame_header_get(fp);515 len = fr_len(fp) - sizeof(*fh);516 seq_cnt = ntohs(fh->fh_seq_cnt);517 if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) {518 cp = fc_frame_payload_get(fp, sizeof(*cp));519 if (!cp) {520 FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n",521 fr_len(fp));522 event = DISC_EV_FAILED;523 } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {524 525 /* Accepted, parse the response. */526 len -= sizeof(*cp);527 error = fc_disc_gpn_ft_parse(disc, cp + 1, len);528 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {529 FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x "530 "(check zoning)\n", cp->ct_reason,531 cp->ct_explan);532 event = DISC_EV_FAILED;533 if (cp->ct_reason == FC_FS_RJT_UNABL &&534 cp->ct_explan == FC_FS_EXP_FTNR)535 event = DISC_EV_SUCCESS;536 } else {537 FC_DISC_DBG(disc, "GPN_FT unexpected response code "538 "%x\n", ntohs(cp->ct_cmd));539 event = DISC_EV_FAILED;540 }541 } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) {542 error = fc_disc_gpn_ft_parse(disc, fh + 1, len);543 } else {544 FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? "545 "seq_cnt %x expected %x sof %x eof %x\n",546 seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp));547 event = DISC_EV_FAILED;548 }549 if (error)550 fc_disc_error(disc, ERR_PTR(error));551 else if (event != DISC_EV_NONE)552 fc_disc_done(disc, event);553 fc_frame_free(fp);554 mutex_unlock(&disc->disc_mutex);555}556 557/**558 * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID)559 * @sp: The sequence the GPN_ID is on560 * @fp: The response frame561 * @rdata_arg: The remote port that sent the GPN_ID response562 *563 * Locking Note: This function is called without disc mutex held.564 */565static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,566 void *rdata_arg)567{568 struct fc_rport_priv *rdata = rdata_arg;569 struct fc_rport_priv *new_rdata;570 struct fc_lport *lport;571 struct fc_disc *disc;572 struct fc_ct_hdr *cp;573 struct fc_ns_gid_pn *pn;574 u64 port_name;575 576 lport = rdata->local_port;577 disc = &lport->disc;578 579 if (PTR_ERR(fp) == -FC_EX_CLOSED)580 goto out;581 if (IS_ERR(fp)) {582 mutex_lock(&disc->disc_mutex);583 fc_disc_restart(disc);584 mutex_unlock(&disc->disc_mutex);585 goto out;586 }587 588 cp = fc_frame_payload_get(fp, sizeof(*cp));589 if (!cp)590 goto redisc;591 if (ntohs(cp->ct_cmd) == FC_FS_ACC) {592 if (fr_len(fp) < sizeof(struct fc_frame_header) +593 sizeof(*cp) + sizeof(*pn))594 goto redisc;595 pn = (struct fc_ns_gid_pn *)(cp + 1);596 port_name = get_unaligned_be64(&pn->fn_wwpn);597 mutex_lock(&rdata->rp_mutex);598 if (rdata->ids.port_name == -1)599 rdata->ids.port_name = port_name;600 else if (rdata->ids.port_name != port_name) {601 FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. "602 "Port-id %6.6x wwpn %16.16llx\n",603 rdata->ids.port_id, port_name);604 mutex_unlock(&rdata->rp_mutex);605 fc_rport_logoff(rdata);606 mutex_lock(&lport->disc.disc_mutex);607 new_rdata = fc_rport_create(lport, rdata->ids.port_id);608 mutex_unlock(&lport->disc.disc_mutex);609 if (new_rdata) {610 new_rdata->disc_id = disc->disc_id;611 fc_rport_login(new_rdata);612 }613 goto free_fp;614 }615 rdata->disc_id = disc->disc_id;616 mutex_unlock(&rdata->rp_mutex);617 fc_rport_login(rdata);618 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {619 FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n",620 cp->ct_reason, cp->ct_explan);621 fc_rport_logoff(rdata);622 } else {623 FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n",624 ntohs(cp->ct_cmd));625redisc:626 mutex_lock(&disc->disc_mutex);627 fc_disc_restart(disc);628 mutex_unlock(&disc->disc_mutex);629 }630free_fp:631 fc_frame_free(fp);632out:633 kref_put(&rdata->kref, fc_rport_destroy);634}635 636/**637 * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request638 * @lport: The local port to initiate discovery on639 * @rdata: remote port private data640 *641 * On failure, an error code is returned.642 */643static int fc_disc_gpn_id_req(struct fc_lport *lport,644 struct fc_rport_priv *rdata)645{646 struct fc_frame *fp;647 648 lockdep_assert_held(&lport->disc.disc_mutex);649 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +650 sizeof(struct fc_ns_fid));651 if (!fp)652 return -ENOMEM;653 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID,654 fc_disc_gpn_id_resp, rdata,655 3 * lport->r_a_tov))656 return -ENOMEM;657 kref_get(&rdata->kref);658 return 0;659}660 661/**662 * fc_disc_single() - Discover the directory information for a single target663 * @lport: The local port the remote port is associated with664 * @dp: The port to rediscover665 */666static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)667{668 struct fc_rport_priv *rdata;669 670 lockdep_assert_held(&lport->disc.disc_mutex);671 672 rdata = fc_rport_create(lport, dp->port_id);673 if (!rdata)674 return -ENOMEM;675 rdata->disc_id = 0;676 return fc_disc_gpn_id_req(lport, rdata);677}678 679/**680 * fc_disc_stop() - Stop discovery for a given lport681 * @lport: The local port that discovery should stop on682 */683static void fc_disc_stop(struct fc_lport *lport)684{685 struct fc_disc *disc = &lport->disc;686 687 if (disc->pending)688 cancel_delayed_work_sync(&disc->disc_work);689 mutex_lock(&disc->disc_mutex);690 fc_disc_stop_rports(disc);691 mutex_unlock(&disc->disc_mutex);692}693 694/**695 * fc_disc_stop_final() - Stop discovery for a given lport696 * @lport: The lport that discovery should stop on697 *698 * This function will block until discovery has been699 * completely stopped and all rports have been deleted.700 */701static void fc_disc_stop_final(struct fc_lport *lport)702{703 fc_disc_stop(lport);704 fc_rport_flush_queue();705}706 707/**708 * fc_disc_config() - Configure the discovery layer for a local port709 * @lport: The local port that needs the discovery layer to be configured710 * @priv: Private data structre for users of the discovery layer711 */712void fc_disc_config(struct fc_lport *lport, void *priv)713{714 struct fc_disc *disc;715 716 if (!lport->tt.disc_start)717 lport->tt.disc_start = fc_disc_start;718 719 if (!lport->tt.disc_stop)720 lport->tt.disc_stop = fc_disc_stop;721 722 if (!lport->tt.disc_stop_final)723 lport->tt.disc_stop_final = fc_disc_stop_final;724 725 if (!lport->tt.disc_recv_req)726 lport->tt.disc_recv_req = fc_disc_recv_req;727 728 disc = &lport->disc;729 730 disc->priv = priv;731}732EXPORT_SYMBOL(fc_disc_config);733 734/**735 * fc_disc_init() - Initialize the discovery layer for a local port736 * @lport: The local port that needs the discovery layer to be initialized737 */738void fc_disc_init(struct fc_lport *lport)739{740 struct fc_disc *disc = &lport->disc;741 742 INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);743 mutex_init(&disc->disc_mutex);744 INIT_LIST_HEAD(&disc->rports);745}746EXPORT_SYMBOL(fc_disc_init);747