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/err.h> 37 #include <asm/unaligned.h> 38 39 #include <scsi/fc/fc_gs.h> 40 41 #include <scsi/libfc.h> 42 43 #define FC_DISC_RETRY_LIMIT 3 /* max retries */ 44 #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ 45 46 static void fc_disc_gpn_ft_req(struct fc_disc *); 47 static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); 48 static void fc_disc_done(struct fc_disc *, enum fc_disc_event); 49 static void fc_disc_timeout(struct work_struct *); 50 static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); 51 static void fc_disc_restart(struct fc_disc *); 52 53 /** 54 * fc_disc_stop_rports() - delete all the remote ports associated with the lport 55 * @disc: The discovery job to stop rports on 56 * 57 * Locking Note: This function expects that the lport mutex is locked before 58 * calling it. 59 */ 60 void fc_disc_stop_rports(struct fc_disc *disc) 61 { 62 struct fc_lport *lport; 63 struct fc_rport_priv *rdata, *next; 64 65 lport = disc->lport; 66 67 mutex_lock(&disc->disc_mutex); 68 list_for_each_entry_safe(rdata, next, &disc->rports, peers) 69 lport->tt.rport_logoff(rdata); 70 mutex_unlock(&disc->disc_mutex); 71 } 72 73 /** 74 * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) 75 * @sp: Current sequence of the RSCN exchange 76 * @fp: RSCN Frame 77 * @lport: Fibre Channel host port instance 78 * 79 * Locking Note: This function expects that the disc_mutex is locked 80 * before it is called. 81 */ 82 static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp, 83 struct fc_disc *disc) 84 { 85 struct fc_lport *lport; 86 struct fc_els_rscn *rp; 87 struct fc_els_rscn_page *pp; 88 struct fc_seq_els_data rjt_data; 89 unsigned int len; 90 int redisc = 0; 91 enum fc_els_rscn_ev_qual ev_qual; 92 enum fc_els_rscn_addr_fmt fmt; 93 LIST_HEAD(disc_ports); 94 struct fc_disc_port *dp, *next; 95 96 lport = disc->lport; 97 98 FC_DISC_DBG(disc, "Received an RSCN event\n"); 99 100 /* make sure the frame contains an RSCN message */ 101 rp = fc_frame_payload_get(fp, sizeof(*rp)); 102 if (!rp) 103 goto reject; 104 /* make sure the page length is as expected (4 bytes) */ 105 if (rp->rscn_page_len != sizeof(*pp)) 106 goto reject; 107 /* get the RSCN payload length */ 108 len = ntohs(rp->rscn_plen); 109 if (len < sizeof(*rp)) 110 goto reject; 111 /* make sure the frame contains the expected payload */ 112 rp = fc_frame_payload_get(fp, len); 113 if (!rp) 114 goto reject; 115 /* payload must be a multiple of the RSCN page size */ 116 len -= sizeof(*rp); 117 if (len % sizeof(*pp)) 118 goto reject; 119 120 for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { 121 ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; 122 ev_qual &= ELS_RSCN_EV_QUAL_MASK; 123 fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; 124 fmt &= ELS_RSCN_ADDR_FMT_MASK; 125 /* 126 * if we get an address format other than port 127 * (area, domain, fabric), then do a full discovery 128 */ 129 switch (fmt) { 130 case ELS_ADDR_FMT_PORT: 131 FC_DISC_DBG(disc, "Port address format for port " 132 "(%6x)\n", ntoh24(pp->rscn_fid)); 133 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 134 if (!dp) { 135 redisc = 1; 136 break; 137 } 138 dp->lp = lport; 139 dp->port_id = ntoh24(pp->rscn_fid); 140 list_add_tail(&dp->peers, &disc_ports); 141 break; 142 case ELS_ADDR_FMT_AREA: 143 case ELS_ADDR_FMT_DOM: 144 case ELS_ADDR_FMT_FAB: 145 default: 146 FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); 147 redisc = 1; 148 break; 149 } 150 } 151 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 152 153 /* 154 * If not doing a complete rediscovery, do GPN_ID on 155 * the individual ports mentioned in the list. 156 * If any of these get an error, do a full rediscovery. 157 * In any case, go through the list and free the entries. 158 */ 159 list_for_each_entry_safe(dp, next, &disc_ports, peers) { 160 list_del(&dp->peers); 161 if (!redisc) 162 redisc = fc_disc_single(lport, dp); 163 kfree(dp); 164 } 165 if (redisc) { 166 FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); 167 fc_disc_restart(disc); 168 } else { 169 FC_DISC_DBG(disc, "RSCN received: not rediscovering. " 170 "redisc %d state %d in_prog %d\n", 171 redisc, lport->state, disc->pending); 172 } 173 fc_frame_free(fp); 174 return; 175 reject: 176 FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); 177 rjt_data.fp = NULL; 178 rjt_data.reason = ELS_RJT_LOGIC; 179 rjt_data.explan = ELS_EXPL_NONE; 180 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 181 fc_frame_free(fp); 182 } 183 184 /** 185 * fc_disc_recv_req() - Handle incoming requests 186 * @sp: Current sequence of the request exchange 187 * @fp: The frame 188 * @lport: The FC local port 189 * 190 * Locking Note: This function is called from the EM and will lock 191 * the disc_mutex before calling the handler for the 192 * request. 193 */ 194 static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp, 195 struct fc_lport *lport) 196 { 197 u8 op; 198 struct fc_disc *disc = &lport->disc; 199 200 op = fc_frame_payload_op(fp); 201 switch (op) { 202 case ELS_RSCN: 203 mutex_lock(&disc->disc_mutex); 204 fc_disc_recv_rscn_req(sp, fp, disc); 205 mutex_unlock(&disc->disc_mutex); 206 break; 207 default: 208 FC_DISC_DBG(disc, "Received an unsupported request, " 209 "the opcode is (%x)\n", op); 210 break; 211 } 212 } 213 214 /** 215 * fc_disc_restart() - Restart discovery 216 * @lport: FC discovery context 217 * 218 * Locking Note: This function expects that the disc mutex 219 * is already locked. 220 */ 221 static void fc_disc_restart(struct fc_disc *disc) 222 { 223 if (!disc->disc_callback) 224 return; 225 226 FC_DISC_DBG(disc, "Restarting discovery\n"); 227 228 disc->requested = 1; 229 if (disc->pending) 230 return; 231 232 /* 233 * Advance disc_id. This is an arbitrary non-zero number that will 234 * match the value in the fc_rport_priv after discovery for all 235 * freshly-discovered remote ports. Avoid wrapping to zero. 236 */ 237 disc->disc_id = (disc->disc_id + 2) | 1; 238 disc->retry_count = 0; 239 fc_disc_gpn_ft_req(disc); 240 } 241 242 /** 243 * fc_disc_start() - Fibre Channel Target discovery 244 * @lport: FC local port 245 * @disc_callback: function to be called when discovery is complete 246 */ 247 static void fc_disc_start(void (*disc_callback)(struct fc_lport *, 248 enum fc_disc_event), 249 struct fc_lport *lport) 250 { 251 struct fc_disc *disc = &lport->disc; 252 253 /* 254 * At this point we may have a new disc job or an existing 255 * one. Either way, let's lock when we make changes to it 256 * and send the GPN_FT request. 257 */ 258 mutex_lock(&disc->disc_mutex); 259 disc->disc_callback = disc_callback; 260 fc_disc_restart(disc); 261 mutex_unlock(&disc->disc_mutex); 262 } 263 264 /** 265 * fc_disc_done() - Discovery has been completed 266 * @disc: FC discovery context 267 * @event: discovery completion status 268 * 269 * Locking Note: This function expects that the disc mutex is locked before 270 * it is called. The discovery callback is then made with the lock released, 271 * and the lock is re-taken before returning from this function 272 */ 273 static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) 274 { 275 struct fc_lport *lport = disc->lport; 276 struct fc_rport_priv *rdata; 277 278 FC_DISC_DBG(disc, "Discovery complete\n"); 279 280 disc->pending = 0; 281 if (disc->requested) { 282 fc_disc_restart(disc); 283 return; 284 } 285 286 /* 287 * Go through all remote ports. If they were found in the latest 288 * discovery, reverify or log them in. Otherwise, log them out. 289 * Skip ports which were never discovered. These are the dNS port 290 * and ports which were created by PLOGI. 291 */ 292 list_for_each_entry(rdata, &disc->rports, peers) { 293 if (!rdata->disc_id) 294 continue; 295 if (rdata->disc_id == disc->disc_id) 296 lport->tt.rport_login(rdata); 297 else 298 lport->tt.rport_logoff(rdata); 299 } 300 301 mutex_unlock(&disc->disc_mutex); 302 disc->disc_callback(lport, event); 303 mutex_lock(&disc->disc_mutex); 304 } 305 306 /** 307 * fc_disc_error() - Handle error on dNS request 308 * @disc: FC discovery context 309 * @fp: The frame pointer 310 */ 311 static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) 312 { 313 struct fc_lport *lport = disc->lport; 314 unsigned long delay = 0; 315 316 FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", 317 PTR_ERR(fp), disc->retry_count, 318 FC_DISC_RETRY_LIMIT); 319 320 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 321 /* 322 * Memory allocation failure, or the exchange timed out, 323 * retry after delay. 324 */ 325 if (disc->retry_count < FC_DISC_RETRY_LIMIT) { 326 /* go ahead and retry */ 327 if (!fp) 328 delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); 329 else { 330 delay = msecs_to_jiffies(lport->e_d_tov); 331 332 /* timeout faster first time */ 333 if (!disc->retry_count) 334 delay /= 4; 335 } 336 disc->retry_count++; 337 schedule_delayed_work(&disc->disc_work, delay); 338 } else 339 fc_disc_done(disc, DISC_EV_FAILED); 340 } 341 } 342 343 /** 344 * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 345 * @lport: FC discovery context 346 * 347 * Locking Note: This function expects that the disc_mutex is locked 348 * before it is called. 349 */ 350 static void fc_disc_gpn_ft_req(struct fc_disc *disc) 351 { 352 struct fc_frame *fp; 353 struct fc_lport *lport = disc->lport; 354 355 WARN_ON(!fc_lport_test_ready(lport)); 356 357 disc->pending = 1; 358 disc->requested = 0; 359 360 disc->buf_len = 0; 361 disc->seq_count = 0; 362 fp = fc_frame_alloc(lport, 363 sizeof(struct fc_ct_hdr) + 364 sizeof(struct fc_ns_gid_ft)); 365 if (!fp) 366 goto err; 367 368 if (lport->tt.elsct_send(lport, 0, fp, 369 FC_NS_GPN_FT, 370 fc_disc_gpn_ft_resp, 371 disc, lport->e_d_tov)) 372 return; 373 err: 374 fc_disc_error(disc, fp); 375 } 376 377 /** 378 * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. 379 * @lport: Fibre Channel host port instance 380 * @buf: GPN_FT response buffer 381 * @len: size of response buffer 382 * 383 * Goes through the list of IDs and names resulting from a request. 384 */ 385 static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) 386 { 387 struct fc_lport *lport; 388 struct fc_gpn_ft_resp *np; 389 char *bp; 390 size_t plen; 391 size_t tlen; 392 int error = 0; 393 struct fc_rport_identifiers ids; 394 struct fc_rport_priv *rdata; 395 396 lport = disc->lport; 397 disc->seq_count++; 398 399 /* 400 * Handle partial name record left over from previous call. 401 */ 402 bp = buf; 403 plen = len; 404 np = (struct fc_gpn_ft_resp *)bp; 405 tlen = disc->buf_len; 406 disc->buf_len = 0; 407 if (tlen) { 408 WARN_ON(tlen >= sizeof(*np)); 409 plen = sizeof(*np) - tlen; 410 WARN_ON(plen <= 0); 411 WARN_ON(plen >= sizeof(*np)); 412 if (plen > len) 413 plen = len; 414 np = &disc->partial_buf; 415 memcpy((char *)np + tlen, bp, plen); 416 417 /* 418 * Set bp so that the loop below will advance it to the 419 * first valid full name element. 420 */ 421 bp -= tlen; 422 len += tlen; 423 plen += tlen; 424 disc->buf_len = (unsigned char) plen; 425 if (plen == sizeof(*np)) 426 disc->buf_len = 0; 427 } 428 429 /* 430 * Handle full name records, including the one filled from above. 431 * Normally, np == bp and plen == len, but from the partial case above, 432 * bp, len describe the overall buffer, and np, plen describe the 433 * partial buffer, which if would usually be full now. 434 * After the first time through the loop, things return to "normal". 435 */ 436 while (plen >= sizeof(*np)) { 437 ids.port_id = ntoh24(np->fp_fid); 438 ids.port_name = ntohll(np->fp_wwpn); 439 440 if (ids.port_id != fc_host_port_id(lport->host) && 441 ids.port_name != lport->wwpn) { 442 rdata = lport->tt.rport_create(lport, ids.port_id); 443 if (rdata) { 444 rdata->ids.port_name = ids.port_name; 445 rdata->disc_id = disc->disc_id; 446 } else { 447 printk(KERN_WARNING "libfc: Failed to allocate " 448 "memory for the newly discovered port " 449 "(%6x)\n", ids.port_id); 450 error = -ENOMEM; 451 } 452 } 453 454 if (np->fp_flags & FC_NS_FID_LAST) { 455 fc_disc_done(disc, DISC_EV_SUCCESS); 456 len = 0; 457 break; 458 } 459 len -= sizeof(*np); 460 bp += sizeof(*np); 461 np = (struct fc_gpn_ft_resp *)bp; 462 plen = len; 463 } 464 465 /* 466 * Save any partial record at the end of the buffer for next time. 467 */ 468 if (error == 0 && len > 0 && len < sizeof(*np)) { 469 if (np != &disc->partial_buf) { 470 FC_DISC_DBG(disc, "Partial buffer remains " 471 "for discovery\n"); 472 memcpy(&disc->partial_buf, np, len); 473 } 474 disc->buf_len = (unsigned char) len; 475 } 476 return error; 477 } 478 479 /** 480 * fc_disc_timeout() - Retry handler for the disc component 481 * @work: Structure holding disc obj that needs retry discovery 482 * 483 * Handle retry of memory allocation for remote ports. 484 */ 485 static void fc_disc_timeout(struct work_struct *work) 486 { 487 struct fc_disc *disc = container_of(work, 488 struct fc_disc, 489 disc_work.work); 490 mutex_lock(&disc->disc_mutex); 491 fc_disc_gpn_ft_req(disc); 492 mutex_unlock(&disc->disc_mutex); 493 } 494 495 /** 496 * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) 497 * @sp: Current sequence of GPN_FT exchange 498 * @fp: response frame 499 * @lp_arg: Fibre Channel host port instance 500 * 501 * Locking Note: This function is called without disc mutex held, and 502 * should do all its processing with the mutex held 503 */ 504 static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, 505 void *disc_arg) 506 { 507 struct fc_disc *disc = disc_arg; 508 struct fc_ct_hdr *cp; 509 struct fc_frame_header *fh; 510 enum fc_disc_event event = DISC_EV_NONE; 511 unsigned int seq_cnt; 512 unsigned int len; 513 int error = 0; 514 515 mutex_lock(&disc->disc_mutex); 516 FC_DISC_DBG(disc, "Received a GPN_FT response\n"); 517 518 if (IS_ERR(fp)) { 519 fc_disc_error(disc, fp); 520 mutex_unlock(&disc->disc_mutex); 521 return; 522 } 523 524 WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ 525 fh = fc_frame_header_get(fp); 526 len = fr_len(fp) - sizeof(*fh); 527 seq_cnt = ntohs(fh->fh_seq_cnt); 528 if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { 529 cp = fc_frame_payload_get(fp, sizeof(*cp)); 530 if (!cp) { 531 FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", 532 fr_len(fp)); 533 event = DISC_EV_FAILED; 534 } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 535 536 /* Accepted, parse the response. */ 537 len -= sizeof(*cp); 538 error = fc_disc_gpn_ft_parse(disc, cp + 1, len); 539 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 540 FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " 541 "(check zoning)\n", cp->ct_reason, 542 cp->ct_explan); 543 event = DISC_EV_FAILED; 544 if (cp->ct_reason == FC_FS_RJT_UNABL && 545 cp->ct_explan == FC_FS_EXP_FTNR) 546 event = DISC_EV_SUCCESS; 547 } else { 548 FC_DISC_DBG(disc, "GPN_FT unexpected response code " 549 "%x\n", ntohs(cp->ct_cmd)); 550 event = DISC_EV_FAILED; 551 } 552 } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { 553 error = fc_disc_gpn_ft_parse(disc, fh + 1, len); 554 } else { 555 FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " 556 "seq_cnt %x expected %x sof %x eof %x\n", 557 seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); 558 event = DISC_EV_FAILED; 559 } 560 if (error) 561 fc_disc_error(disc, fp); 562 else if (event != DISC_EV_NONE) 563 fc_disc_done(disc, event); 564 fc_frame_free(fp); 565 mutex_unlock(&disc->disc_mutex); 566 } 567 568 /** 569 * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) 570 * @sp: exchange sequence 571 * @fp: response frame 572 * @rdata_arg: remote port private data 573 * 574 * Locking Note: This function is called without disc mutex held. 575 */ 576 static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 577 void *rdata_arg) 578 { 579 struct fc_rport_priv *rdata = rdata_arg; 580 struct fc_rport_priv *new_rdata; 581 struct fc_lport *lport; 582 struct fc_disc *disc; 583 struct fc_ct_hdr *cp; 584 struct fc_ns_gid_pn *pn; 585 u64 port_name; 586 587 lport = rdata->local_port; 588 disc = &lport->disc; 589 590 mutex_lock(&disc->disc_mutex); 591 if (PTR_ERR(fp) == -FC_EX_CLOSED) 592 goto out; 593 if (IS_ERR(fp)) 594 goto redisc; 595 596 cp = fc_frame_payload_get(fp, sizeof(*cp)); 597 if (!cp) 598 goto redisc; 599 if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 600 if (fr_len(fp) < sizeof(struct fc_frame_header) + 601 sizeof(*cp) + sizeof(*pn)) 602 goto redisc; 603 pn = (struct fc_ns_gid_pn *)(cp + 1); 604 port_name = get_unaligned_be64(&pn->fn_wwpn); 605 if (rdata->ids.port_name == -1) 606 rdata->ids.port_name = port_name; 607 else if (rdata->ids.port_name != port_name) { 608 FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " 609 "Port-id %x wwpn %llx\n", 610 rdata->ids.port_id, port_name); 611 lport->tt.rport_logoff(rdata); 612 613 new_rdata = lport->tt.rport_create(lport, 614 rdata->ids.port_id); 615 if (new_rdata) { 616 new_rdata->disc_id = disc->disc_id; 617 lport->tt.rport_login(new_rdata); 618 } 619 goto out; 620 } 621 rdata->disc_id = disc->disc_id; 622 lport->tt.rport_login(rdata); 623 } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 624 FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", 625 cp->ct_reason, cp->ct_explan); 626 lport->tt.rport_logoff(rdata); 627 } else { 628 FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", 629 ntohs(cp->ct_cmd)); 630 redisc: 631 fc_disc_restart(disc); 632 } 633 out: 634 mutex_unlock(&disc->disc_mutex); 635 kref_put(&rdata->kref, lport->tt.rport_destroy); 636 } 637 638 /** 639 * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request 640 * @lport: local port 641 * @rdata: remote port private data 642 * 643 * Locking Note: This function expects that the disc_mutex is locked 644 * before it is called. 645 * On failure, an error code is returned. 646 */ 647 static int fc_disc_gpn_id_req(struct fc_lport *lport, 648 struct fc_rport_priv *rdata) 649 { 650 struct fc_frame *fp; 651 652 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 653 sizeof(struct fc_ns_fid)); 654 if (!fp) 655 return -ENOMEM; 656 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, 657 fc_disc_gpn_id_resp, rdata, lport->e_d_tov)) 658 return -ENOMEM; 659 kref_get(&rdata->kref); 660 return 0; 661 } 662 663 /** 664 * fc_disc_single() - Discover the directory information for a single target 665 * @lport: local port 666 * @dp: The port to rediscover 667 * 668 * Locking Note: This function expects that the disc_mutex is locked 669 * before it is called. 670 */ 671 static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) 672 { 673 struct fc_rport_priv *rdata; 674 675 rdata = lport->tt.rport_create(lport, dp->port_id); 676 if (!rdata) 677 return -ENOMEM; 678 rdata->disc_id = 0; 679 return fc_disc_gpn_id_req(lport, rdata); 680 } 681 682 /** 683 * fc_disc_stop() - Stop discovery for a given lport 684 * @lport: The lport that discovery should stop for 685 */ 686 void fc_disc_stop(struct fc_lport *lport) 687 { 688 struct fc_disc *disc = &lport->disc; 689 690 if (disc) { 691 cancel_delayed_work_sync(&disc->disc_work); 692 fc_disc_stop_rports(disc); 693 } 694 } 695 696 /** 697 * fc_disc_stop_final() - Stop discovery for a given lport 698 * @lport: The lport that discovery should stop for 699 * 700 * This function will block until discovery has been 701 * completely stopped and all rports have been deleted. 702 */ 703 void fc_disc_stop_final(struct fc_lport *lport) 704 { 705 fc_disc_stop(lport); 706 lport->tt.rport_flush_queue(); 707 } 708 709 /** 710 * fc_disc_init() - Initialize the discovery block 711 * @lport: FC local port 712 */ 713 int fc_disc_init(struct fc_lport *lport) 714 { 715 struct fc_disc *disc; 716 717 if (!lport->tt.disc_start) 718 lport->tt.disc_start = fc_disc_start; 719 720 if (!lport->tt.disc_stop) 721 lport->tt.disc_stop = fc_disc_stop; 722 723 if (!lport->tt.disc_stop_final) 724 lport->tt.disc_stop_final = fc_disc_stop_final; 725 726 if (!lport->tt.disc_recv_req) 727 lport->tt.disc_recv_req = fc_disc_recv_req; 728 729 disc = &lport->disc; 730 INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); 731 mutex_init(&disc->disc_mutex); 732 INIT_LIST_HEAD(&disc->rports); 733 734 disc->lport = lport; 735 736 return 0; 737 } 738 EXPORT_SYMBOL(fc_disc_init); 739