1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. 4 * 5 * Maintained at www.Open-FCoE.org 6 */ 7 8/* 9 * Target Discovery 10 * 11 * This block discovers all FC-4 remote ports, including FCP initiators. It 12 * also handles RSCN events and re-discovery if necessary. 13 */ 14 15/* 16 * DISC LOCKING 17 * 18 * The disc mutex is can be locked when acquiring rport locks, but may not 19 * be held when acquiring the lport lock. Refer to fc_lport.c for more 20 * 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 <asm/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 lport 49 * @disc: The discovery job to stop remote ports on 50 */ 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 applies 68 * @fp: The RSCN frame 69 */ 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 port 113 * (area, domain, fabric), then do a full discovery 114 */ 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 on 141 * 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 requests 171 * @lport: The local port receiving the request 172 * @fp: The request frame 173 * 174 * Locking Note: This function is called from the EM and will lock 175 * the disc_mutex before calling the handler for the 176 * 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 discovery 200 * @disc: The discovery object to be restarted 201 */ 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 will 217 * match the value in the fc_rport_priv after discovery for all 218 * 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 port 227 * @lport: The local port to have discovery started on 228 * @disc_callback: Callback function to be called when discovery is complete 229 */ 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 existing 238 * one. Either way, let's lock when we make changes to it 239 * 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 completed 249 * @disc: The discovery context 250 * @event: The discovery completion status 251 */ 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 latest 268 * discovery, reverify or log them in. Otherwise, log them out. 269 * Skip ports which were never discovered. These are the dNS port 270 * and ports which were created by PLOGI. 271 * 272 * We don't need to use the _rcu variant here as the rport list 273 * 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 else 282 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 request 293 * @disc: The discovery context 294 * @fp: The error code encoded as a frame pointer 295 */ 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 } else 324 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, clear 328 * pending flag so that subsequent discovery can 329 * continue 330 */ 331 disc->pending = 0; 332 } 333} 334 335/** 336 * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 337 * @disc: The discovery context 338 */ 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 context 371 * @buf: The GPN_FT response buffer 372 * @len: The size of response buffer 373 * 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 the 410 * 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 the 424 * 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 timeouts 472 * @work: Structure holding discovery context that needs to retry discovery 473 */ 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 on 487 * @fp: The GPN_FT response frame 488 * @disc_arg: The discovery context 489 * 490 * Locking Note: This function is called without disc mutex held, and 491 * should do all its processing with the mutex held 492 */ 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 on 560 * @fp: The response frame 561 * @rdata_arg: The remote port that sent the GPN_ID response 562 * 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) request 638 * @lport: The local port to initiate discovery on 639 * @rdata: remote port private data 640 * 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 target 663 * @lport: The local port the remote port is associated with 664 * @dp: The port to rediscover 665 */ 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 lport 681 * @lport: The local port that discovery should stop on 682 */ 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 lport 696 * @lport: The lport that discovery should stop on 697 * 698 * This function will block until discovery has been 699 * 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 port 709 * @lport: The local port that needs the discovery layer to be configured 710 * @priv: Private data structre for users of the discovery layer 711 */ 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 port 736 * @lport: The local port that needs the discovery layer to be initialized 737 */ 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