1/* 2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20/* 21 * Target Discovery 22 * 23 * This block discovers all FC-4 remote ports, including FCP initiators. It 24 * also handles RSCN events and re-discovery if necessary. 25 */ 26 27/* 28 * DISC LOCKING 29 * 30 * The disc mutex is can be locked when acquiring rport locks, but may not 31 * be held when acquiring the lport lock. Refer to fc_lport.c for more 32 * details. 33 */ 34 35#include <linux/timer.h> 36#include <linux/slab.h> 37#include <linux/err.h> 38#include <asm/unaligned.h> 39 40#include <scsi/fc/fc_gs.h> 41 42#include <scsi/libfc.h> 43 44#include "fc_libfc.h" 45 46#define FC_DISC_RETRY_LIMIT 3 /* max retries */ 47#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ 48 49static void fc_disc_gpn_ft_req(struct fc_disc *); 50static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); 51static void fc_disc_done(struct fc_disc *, enum fc_disc_event); 52static void fc_disc_timeout(struct work_struct *); 53static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); 54static void fc_disc_restart(struct fc_disc *); 55 56/** 57 * fc_disc_stop_rports() - Delete all the remote ports associated with the lport 58 * @disc: The discovery job to stop remote ports on 59 * 60 * Locking Note: This function expects that the lport mutex is locked before 61 * calling it. 62 */ 63void fc_disc_stop_rports(struct fc_disc *disc) 64{ 65 struct fc_lport *lport; 66 struct fc_rport_priv *rdata; 67 68 lport = fc_disc_lport(disc); 69 70 mutex_lock(&disc->disc_mutex); 71 list_for_each_entry_rcu(rdata, &disc->rports, peers) 72 lport->tt.rport_logoff(rdata); 73 mutex_unlock(&disc->disc_mutex); 74} 75 76/** 77 * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) 78 * @disc: The discovery object to which the RSCN applies 79 * @fp: The RSCN frame 80 * 81 * Locking Note: This function expects that the disc_mutex is locked 82 * before it is called. 83 */ 84static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) 85{ 86 struct fc_lport *lport; 87 struct fc_els_rscn *rp; 88 struct fc_els_rscn_page *pp; 89 struct fc_seq_els_data rjt_data; 90 unsigned int len; 91 int redisc = 0; 92 enum fc_els_rscn_ev_qual ev_qual; 93 enum fc_els_rscn_addr_fmt fmt; 94 LIST_HEAD(disc_ports); 95 struct fc_disc_port *dp, *next; 96 97 lport = fc_disc_lport(disc); 98 99 FC_DISC_DBG(disc, "Received an RSCN event\n"); 100 101 /* make sure the frame contains an RSCN message */ 102 rp = fc_frame_payload_get(fp, sizeof(*rp)); 103 if (!rp) 104 goto reject; 105 /* make sure the page length is as expected (4 bytes) */ 106 if (rp->rscn_page_len != sizeof(*pp)) 107 goto reject; 108 /* get the RSCN payload length */ 109 len = ntohs(rp->rscn_plen); 110 if (len < sizeof(*rp)) 111 goto reject; 112 /* make sure the frame contains the expected payload */ 113 rp = fc_frame_payload_get(fp, len); 114 if (!rp) 115 goto reject; 116 /* payload must be a multiple of the RSCN page size */ 117 len -= sizeof(*rp); 118 if (len % sizeof(*pp)) 119 goto reject; 120 121 for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { 122 ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; 123 ev_qual &= ELS_RSCN_EV_QUAL_MASK; 124 fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; 125 fmt &= ELS_RSCN_ADDR_FMT_MASK; 126 /* 127 * if we get an address format other than port 128 * (area, domain, fabric), then do a full discovery 129 */ 130 switch (fmt) { 131 case ELS_ADDR_FMT_PORT: 132 FC_DISC_DBG(disc, "Port address format for port " 133 "(%6.6x)\n", ntoh24(pp->rscn_fid)); 134 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 135 if (!dp) { 136 redisc = 1; 137 break; 138 } 139 dp->lp = lport; 140 dp->port_id = ntoh24(pp->rscn_fid); 141 list_add_tail(&dp->peers, &disc_ports); 142 break; 143 case ELS_ADDR_FMT_AREA: 144 case ELS_ADDR_FMT_DOM: 145 case ELS_ADDR_FMT_FAB: 146 default: 147 FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); 148 redisc = 1; 149 break; 150 } 151 } 152 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 153 154 /* 155 * If not doing a complete rediscovery, do GPN_ID on 156 * the individual ports mentioned in the list. 157 * If any of these get an error, do a full rediscovery. 158 * In any case, go through the list and free the entries. 159 */ 160 list_for_each_entry_safe(dp, next, &disc_ports, peers) { 161 list_del(&dp->peers); 162 if (!redisc) 163 redisc = fc_disc_single(lport, dp); 164 kfree(dp); 165 } 166 if (redisc) { 167 FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); 168 fc_disc_restart(disc); 169 } else { 170 FC_DISC_DBG(disc, "RSCN received: not rediscovering. " 171 "redisc %d state %d in_prog %d\n", 172 redisc, lport->state, disc->pending); 173 } 174 fc_frame_free(fp); 175 return; 176reject: 177 FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); 178 rjt_data.reason = ELS_RJT_LOGIC; 179 rjt_data.explan = ELS_EXPL_NONE; 180 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); 181 fc_frame_free(fp); 182} 183 184/** 185 * fc_disc_recv_req() - Handle incoming requests 186 * @lport: The local port receiving the request 187 * @fp: The request frame 188 * 189 * Locking Note: This function is called from the EM and will lock 190 * the disc_mutex before calling the handler for the 191 * request. 192 */ 193static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) 194{ 195 u8 op; 196 struct fc_disc *disc = &lport->disc; 197 198 op = fc_frame_payload_op(fp); 199 switch (op) { 200 case ELS_RSCN: 201 mutex_lock(&disc->disc_mutex); 202 fc_disc_recv_rscn_req(disc, fp); 203 mutex_unlock(&disc->disc_mutex); 204 break; 205 default: 206 FC_DISC_DBG(disc, "Received an unsupported request, " 207 "the opcode is (%x)\n", op); 208 break; 209 } 210} 211 212/** 213 * fc_disc_restart() - Restart discovery 214 * @disc: The discovery object to be restarted 215 * 216 * Locking Note: This function expects that the disc mutex 217 * is already locked. 218 */ 219static void fc_disc_restart(struct fc_disc *disc) 220{ 221 if (!disc->disc_callback) 222 return; 223 224 FC_DISC_DBG(disc, "Restarting discovery\n"); 225 226 disc->requested = 1; 227 if (disc->pending) 228 return; 229 230 /* 231 * Advance disc_id. This is an arbitrary non-zero number that will 232 * match the value in the fc_rport_priv after discovery for all 233 * freshly-discovered remote ports. Avoid wrapping to zero. 234 */ 235 disc->disc_id = (disc->disc_id + 2) | 1; 236 disc->retry_count = 0; 237 fc_disc_gpn_ft_req(disc); 238} 239 240/** 241 * fc_disc_start() - Start discovery on a local port 242 * @lport: The local port to have discovery started on 243 * @disc_callback: Callback function to be called when discovery is complete 244 */ 245static void fc_disc_start(void (*disc_callback)(struct fc_lport *, 246 enum fc_disc_event), 247 struct fc_lport *lport) 248{ 249 struct fc_disc *disc = &lport->disc; 250 251 /* 252 * At this point we may have a new disc job or an existing 253 * one. Either way, let's lock when we make changes to it 254 * and send the GPN_FT request. 255 */ 256 mutex_lock(&disc->disc_mutex); 257 disc->disc_callback = disc_callback; 258 fc_disc_restart(disc); 259 mutex_unlock(&disc->disc_mutex); 260} 261 262/** 263 * fc_disc_done() - Discovery has been completed 264 * @disc: The discovery context 265 * @event: The discovery completion status 266 * 267 * Locking Note: This function expects that the disc mutex is locked before 268 * it is called. The discovery callback is then made with the lock released, 269 * and the lock is re-taken before returning from this function 270 */ 271static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) 272{ 273 struct fc_lport *lport = fc_disc_lport(disc); 274 struct fc_rport_priv *rdata; 275 276 FC_DISC_DBG(disc, "Discovery complete\n"); 277 278 disc->pending = 0; 279 if (disc->requested) { 280 fc_disc_restart(disc); 281 return; 282 } 283 284 /* 285 * Go through all remote ports. If they were found in the latest 286 * discovery, reverify or log them in. Otherwise, log them out. 287 * Skip ports which were never discovered. These are the dNS port 288 * and ports which were created by PLOGI. 289 */ 290 list_for_each_entry_rcu(rdata, &disc->rports, peers) { 291 if (!rdata->disc_id) 292 continue; 293 if (rdata->disc_id == disc->disc_id) 294 lport->tt.rport_login(rdata); 295 else 296 lport->tt.rport_logoff(rdata); 297 } 298 299 mutex_unlock(&disc->disc_mutex); 300 disc->disc_callback(lport, event); 301 mutex_lock(&disc->disc_mutex); 302} 303 304/** 305 * fc_disc_error() - Handle error on dNS request 306 * @disc: The discovery context 307 * @fp: The error code encoded as a frame pointer 308 */ 309static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) 310{ 311 struct fc_lport *lport = fc_disc_lport(disc); 312 unsigned long delay = 0; 313 314 FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", 315 PTR_ERR(fp), disc->retry_count, 316 FC_DISC_RETRY_LIMIT); 317 318 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 319 /* 320 * Memory allocation failure, or the exchange timed out, 321 * retry after delay. 322 */ 323 if (disc->retry_count < FC_DISC_RETRY_LIMIT) { 324 /* go ahead and retry */ 325 if (!fp) 326 delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); 327 else { 328 delay = msecs_to_jiffies(lport->e_d_tov); 329 330 /* timeout faster first time */ 331 if (!disc->retry_count) 332 delay /= 4; 333 } 334 disc->retry_count++; 335 schedule_delayed_work(&disc->disc_work, delay); 336 } else 337 fc_disc_done(disc, DISC_EV_FAILED); 338 } 339} 340 341/** 342 * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 343 * @lport: The discovery context 344 * 345 * Locking Note: This function expects that the disc_mutex is locked 346 * before it is called. 347 */ 348static void fc_disc_gpn_ft_req(struct fc_disc *disc) 349{ 350 struct fc_frame *fp; 351 struct fc_lport *lport = fc_disc_lport(disc); 352 353 WARN_ON(!fc_lport_test_ready(lport)); 354 355 disc->pending = 1; 356 disc->requested = 0; 357 358 disc->buf_len = 0; 359 disc->seq_count = 0; 360 fp = fc_frame_alloc(lport, 361 sizeof(struct fc_ct_hdr) + 362 sizeof(struct fc_ns_gid_ft)); 363 if (!fp) 364 goto err; 365 366 if (lport->tt.elsct_send(lport, 0, fp, 367 FC_NS_GPN_FT, 368 fc_disc_gpn_ft_resp, 369 disc, 3 * lport->r_a_tov)) 370 return; 371err: 372 fc_disc_error(disc, NULL); 373} 374 375/** 376 * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. 377 * @lport: The local port the GPN_FT was received on 378 * @buf: The GPN_FT response buffer 379 * @len: The size of response buffer 380 * 381 * Goes through the list of IDs and names resulting from a request. 382 */ 383static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) 384{ 385 struct fc_lport *lport; 386 struct fc_gpn_ft_resp *np; 387 char *bp; 388 size_t plen; 389 size_t tlen; 390 int error = 0; 391 struct fc_rport_identifiers ids; 392 struct fc_rport_priv *rdata; 393 394 lport = fc_disc_lport(disc); 395 disc->seq_count++; 396 397 /* 398 * Handle partial name record left over from previous call. 399 */ 400 bp = buf; 401 plen = len; 402 np = (struct fc_gpn_ft_resp *)bp; 403 tlen = disc->buf_len; 404 disc->buf_len = 0; 405 if (tlen) { 406 WARN_ON(tlen >= sizeof(*np)); 407 plen = sizeof(*np) - tlen; 408 WARN_ON(plen <= 0); 409 WARN_ON(plen >= sizeof(*np)); 410 if (plen > len) 411 plen = len; 412 np = &disc->partial_buf; 413 memcpy((char *)np + tlen, bp, plen); 414 415 /* 416 * Set bp so that the loop below will advance it to the 417 * first valid full name element. 418 */ 419 bp -= tlen; 420 len += tlen; 421 plen += tlen; 422 disc->buf_len = (unsigned char) plen; 423 if (plen == sizeof(*np)) 424 disc->buf_len = 0; 425 } 426 427 /* 428 * Handle full name records, including the one filled from above. 429 * Normally, np == bp and plen == len, but from the partial case above, 430 * bp, len describe the overall buffer, and np, plen describe the 431 * partial buffer, which if would usually be full now. 432 * After the first time through the loop, things return to "normal". 433 */ 434 while (plen >= sizeof(*np)) { 435 ids.port_id = ntoh24(np->fp_fid); 436 ids.port_name = ntohll(np->fp_wwpn); 437 438 if (ids.port_id != lport->port_id && 439 ids.port_name != lport->wwpn) { 440 rdata = lport->tt.rport_create(lport, ids.port_id); 441 if (rdata) { 442 rdata->ids.port_name = ids.port_name; 443 rdata->disc_id = disc->disc_id; 444 } else { 445 printk(KERN_WARNING "libfc: Failed to allocate " 446 "memory for the newly discovered port " 447 "(%6.6x)\n", ids.port_id); 448 error = -ENOMEM; 449 } 450 } 451 452 if (np->fp_flags & FC_NS_FID_LAST) { 453 fc_disc_done(disc, DISC_EV_SUCCESS); 454 len = 0; 455 break; 456 } 457 len -= sizeof(*np); 458 bp += sizeof(*np); 459 np = (struct fc_gpn_ft_resp *)bp; 460 plen = len; 461 } 462 463 /* 464 * Save any partial record at the end of the buffer for next time. 465 */ 466 if (error == 0 && len > 0 && len < sizeof(*np)) { 467 if (np != &disc->partial_buf) { 468 FC_DISC_DBG(disc, "Partial buffer remains " 469 "for discovery\n"); 470 memcpy(&disc->partial_buf, np, len); 471 } 472 disc->buf_len = (unsigned char) len; 473 } 474 return error; 475} 476 477/** 478 * fc_disc_timeout() - Handler for discovery timeouts 479 * @work: Structure holding discovery context that needs to retry discovery 480 */ 481static void fc_disc_timeout(struct work_struct *work) 482{ 483 struct fc_disc *disc = container_of(work, 484 struct fc_disc, 485 disc_work.work); 486 mutex_lock(&disc->disc_mutex); 487 fc_disc_gpn_ft_req(disc); 488 mutex_unlock(&disc->disc_mutex); 489} 490 491/** 492 * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) 493 * @sp: The sequence that the GPN_FT response was received on 494 * @fp: The GPN_FT response frame 495 * @lp_arg: The discovery context 496 * 497 * Locking Note: This function is called without disc mutex held, and 498 * should do all its processing with the mutex held 499 */ 500static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, 501 void *disc_arg) 502{ 503 struct fc_disc *disc = disc_arg; 504 struct fc_ct_hdr *cp; 505 struct fc_frame_header *fh; 506 enum fc_disc_event event = DISC_EV_NONE; 507 unsigned int seq_cnt; 508 unsigned int len; 509 int error = 0; 510 511 mutex_lock(&disc->disc_mutex); 512 FC_DISC_DBG(disc, "Received a GPN_FT response\n"); 513 514 if (IS_ERR(fp)) { 515 fc_disc_error(disc, fp); 516 mutex_unlock(&disc->disc_mutex); 517 return; 518 } 519 520 WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ 521 fh = fc_frame_header_get(fp); 522 len = fr_len(fp) - sizeof(*fh); 523 seq_cnt = ntohs(fh->fh_seq_cnt); 524 if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { 525 cp = fc_frame_payload_get(fp, sizeof(*cp)); 526 if (!cp) { 527 FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", 528 fr_len(fp)); 529 event = DISC_EV_FAILED; 530 } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 531 532 /* Accepted, parse the response. */ 533 len -= sizeof(*cp); 534 error = fc_disc_gpn_ft_parse(disc, cp + 1, len); 535 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 536 FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " 537 "(check zoning)\n", cp->ct_reason, 538 cp->ct_explan); 539 event = DISC_EV_FAILED; 540 if (cp->ct_reason == FC_FS_RJT_UNABL && 541 cp->ct_explan == FC_FS_EXP_FTNR) 542 event = DISC_EV_SUCCESS; 543 } else { 544 FC_DISC_DBG(disc, "GPN_FT unexpected response code " 545 "%x\n", ntohs(cp->ct_cmd)); 546 event = DISC_EV_FAILED; 547 } 548 } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { 549 error = fc_disc_gpn_ft_parse(disc, fh + 1, len); 550 } else { 551 FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " 552 "seq_cnt %x expected %x sof %x eof %x\n", 553 seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); 554 event = DISC_EV_FAILED; 555 } 556 if (error) 557 fc_disc_error(disc, fp); 558 else if (event != DISC_EV_NONE) 559 fc_disc_done(disc, event); 560 fc_frame_free(fp); 561 mutex_unlock(&disc->disc_mutex); 562} 563 564/** 565 * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) 566 * @sp: The sequence the GPN_ID is on 567 * @fp: The response frame 568 * @rdata_arg: The remote port that sent the GPN_ID response 569 * 570 * Locking Note: This function is called without disc mutex held. 571 */ 572static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 573 void *rdata_arg) 574{ 575 struct fc_rport_priv *rdata = rdata_arg; 576 struct fc_rport_priv *new_rdata; 577 struct fc_lport *lport; 578 struct fc_disc *disc; 579 struct fc_ct_hdr *cp; 580 struct fc_ns_gid_pn *pn; 581 u64 port_name; 582 583 lport = rdata->local_port; 584 disc = &lport->disc; 585 586 mutex_lock(&disc->disc_mutex); 587 if (PTR_ERR(fp) == -FC_EX_CLOSED) 588 goto out; 589 if (IS_ERR(fp)) 590 goto redisc; 591 592 cp = fc_frame_payload_get(fp, sizeof(*cp)); 593 if (!cp) 594 goto redisc; 595 if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 596 if (fr_len(fp) < sizeof(struct fc_frame_header) + 597 sizeof(*cp) + sizeof(*pn)) 598 goto redisc; 599 pn = (struct fc_ns_gid_pn *)(cp + 1); 600 port_name = get_unaligned_be64(&pn->fn_wwpn); 601 if (rdata->ids.port_name == -1) 602 rdata->ids.port_name = port_name; 603 else if (rdata->ids.port_name != port_name) { 604 FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " 605 "Port-id %6.6x wwpn %16.16llx\n", 606 rdata->ids.port_id, port_name); 607 lport->tt.rport_logoff(rdata); 608 609 new_rdata = lport->tt.rport_create(lport, 610 rdata->ids.port_id); 611 if (new_rdata) { 612 new_rdata->disc_id = disc->disc_id; 613 lport->tt.rport_login(new_rdata); 614 } 615 goto out; 616 } 617 rdata->disc_id = disc->disc_id; 618 lport->tt.rport_login(rdata); 619 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 620 FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", 621 cp->ct_reason, cp->ct_explan); 622 lport->tt.rport_logoff(rdata); 623 } else { 624 FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", 625 ntohs(cp->ct_cmd)); 626redisc: 627 fc_disc_restart(disc); 628 } 629out: 630 mutex_unlock(&disc->disc_mutex); 631 kref_put(&rdata->kref, lport->tt.rport_destroy); 632} 633 634/** 635 * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request 636 * @lport: The local port to initiate discovery on 637 * @rdata: remote port private data 638 * 639 * Locking Note: This function expects that the disc_mutex is locked 640 * before it is called. 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 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 649 sizeof(struct fc_ns_fid)); 650 if (!fp) 651 return -ENOMEM; 652 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, 653 fc_disc_gpn_id_resp, rdata, 654 3 * lport->r_a_tov)) 655 return -ENOMEM; 656 kref_get(&rdata->kref); 657 return 0; 658} 659 660/** 661 * fc_disc_single() - Discover the directory information for a single target 662 * @lport: The local port the remote port is associated with 663 * @dp: The port to rediscover 664 * 665 * Locking Note: This function expects that the disc_mutex is locked 666 * before it is called. 667 */ 668static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) 669{ 670 struct fc_rport_priv *rdata; 671 672 rdata = lport->tt.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 */ 683void fc_disc_stop(struct fc_lport *lport) 684{ 685 struct fc_disc *disc = &lport->disc; 686 687 if (disc) { 688 cancel_delayed_work_sync(&disc->disc_work); 689 fc_disc_stop_rports(disc); 690 } 691} 692 693/** 694 * fc_disc_stop_final() - Stop discovery for a given lport 695 * @lport: The lport that discovery should stop on 696 * 697 * This function will block until discovery has been 698 * completely stopped and all rports have been deleted. 699 */ 700void fc_disc_stop_final(struct fc_lport *lport) 701{ 702 fc_disc_stop(lport); 703 lport->tt.rport_flush_queue(); 704} 705 706/** 707 * fc_disc_init() - Initialize the discovery layer for a local port 708 * @lport: The local port that needs the discovery layer to be initialized 709 */ 710int fc_disc_init(struct fc_lport *lport) 711{ 712 struct fc_disc *disc; 713 714 if (!lport->tt.disc_start) 715 lport->tt.disc_start = fc_disc_start; 716 717 if (!lport->tt.disc_stop) 718 lport->tt.disc_stop = fc_disc_stop; 719 720 if (!lport->tt.disc_stop_final) 721 lport->tt.disc_stop_final = fc_disc_stop_final; 722 723 if (!lport->tt.disc_recv_req) 724 lport->tt.disc_recv_req = fc_disc_recv_req; 725 726 disc = &lport->disc; 727 INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); 728 mutex_init(&disc->disc_mutex); 729 INIT_LIST_HEAD(&disc->rports); 730 731 disc->priv = lport; 732 733 return 0; 734} 735EXPORT_SYMBOL(fc_disc_init); 736