1 /* 2 * Copyright(c) 2007 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 * PORT LOCKING NOTES 22 * 23 * These comments only apply to the 'port code' which consists of the lport, 24 * disc and rport blocks. 25 * 26 * MOTIVATION 27 * 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. 34 * 35 * HEIRARCHY 36 * 37 * The following heirarchy 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 heirarchy- 40 * 41 * lport > disc, lport > rport, disc > rport 42 * 43 * CALLBACKS 44 * 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 47 * (to the lport). 48 * 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 becuase no other rport work in this queue can be executed 56 * at the same time. 57 * 58 * When discovery succeeds or fails a callback is made to the lport as 59 * notification. Currently, succesful 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. 62 */ 63 64 /* 65 * LPORT LOCKING 66 * 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 70 * performance. 71 * 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. 79 * 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. 84 * 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). 88 */ 89 90 #include <linux/timer.h> 91 #include <asm/unaligned.h> 92 93 #include <scsi/fc/fc_gs.h> 94 95 #include <scsi/libfc.h> 96 #include <scsi/fc_encode.h> 97 98 /* Fabric IDs to use for point-to-point mode, chosen on whims. */ 99 #define FC_LOCAL_PTP_FID_LO 0x010101 100 #define FC_LOCAL_PTP_FID_HI 0x010102 101 102 #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ 103 104 static int fc_lport_debug; 105 106 #define FC_DEBUG_LPORT(fmt...) \ 107 do { \ 108 if (fc_lport_debug) \ 109 FC_DBG(fmt); \ 110 } while (0) 111 112 static void fc_lport_error(struct fc_lport *, struct fc_frame *); 113 114 static void fc_lport_enter_reset(struct fc_lport *); 115 static void fc_lport_enter_flogi(struct fc_lport *); 116 static void fc_lport_enter_dns(struct fc_lport *); 117 static void fc_lport_enter_rpn_id(struct fc_lport *); 118 static void fc_lport_enter_rft_id(struct fc_lport *); 119 static void fc_lport_enter_scr(struct fc_lport *); 120 static void fc_lport_enter_ready(struct fc_lport *); 121 static void fc_lport_enter_logo(struct fc_lport *); 122 123 static const char *fc_lport_state_names[] = { 124 [LPORT_ST_NONE] = "none", 125 [LPORT_ST_FLOGI] = "FLOGI", 126 [LPORT_ST_DNS] = "dNS", 127 [LPORT_ST_RPN_ID] = "RPN_ID", 128 [LPORT_ST_RFT_ID] = "RFT_ID", 129 [LPORT_ST_SCR] = "SCR", 130 [LPORT_ST_READY] = "Ready", 131 [LPORT_ST_LOGO] = "LOGO", 132 [LPORT_ST_RESET] = "reset", 133 }; 134 135 static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) 136 { 137 fc_frame_free(fp); 138 return 0; 139 } 140 141 /** 142 * fc_lport_rport_callback() - Event handler for rport events 143 * @lport: The lport which is receiving the event 144 * @rport: The rport which the event has occured on 145 * @event: The event that occured 146 * 147 * Locking Note: The rport lock should not be held when calling 148 * this function. 149 */ 150 static void fc_lport_rport_callback(struct fc_lport *lport, 151 struct fc_rport *rport, 152 enum fc_rport_event event) 153 { 154 FC_DEBUG_LPORT("Received a %d event for port (%6x)\n", event, 155 rport->port_id); 156 157 switch (event) { 158 case RPORT_EV_CREATED: 159 if (rport->port_id == FC_FID_DIR_SERV) { 160 mutex_lock(&lport->lp_mutex); 161 if (lport->state == LPORT_ST_DNS) { 162 lport->dns_rp = rport; 163 fc_lport_enter_rpn_id(lport); 164 } else { 165 FC_DEBUG_LPORT("Received an CREATED event on " 166 "port (%6x) for the directory " 167 "server, but the lport is not " 168 "in the DNS state, it's in the " 169 "%d state", rport->port_id, 170 lport->state); 171 lport->tt.rport_logoff(rport); 172 } 173 mutex_unlock(&lport->lp_mutex); 174 } else 175 FC_DEBUG_LPORT("Received an event for port (%6x) " 176 "which is not the directory server\n", 177 rport->port_id); 178 break; 179 case RPORT_EV_LOGO: 180 case RPORT_EV_FAILED: 181 case RPORT_EV_STOP: 182 if (rport->port_id == FC_FID_DIR_SERV) { 183 mutex_lock(&lport->lp_mutex); 184 lport->dns_rp = NULL; 185 mutex_unlock(&lport->lp_mutex); 186 187 } else 188 FC_DEBUG_LPORT("Received an event for port (%6x) " 189 "which is not the directory server\n", 190 rport->port_id); 191 break; 192 case RPORT_EV_NONE: 193 break; 194 } 195 } 196 197 /** 198 * fc_lport_state() - Return a string which represents the lport's state 199 * @lport: The lport whose state is to converted to a string 200 */ 201 static const char *fc_lport_state(struct fc_lport *lport) 202 { 203 const char *cp; 204 205 cp = fc_lport_state_names[lport->state]; 206 if (!cp) 207 cp = "unknown"; 208 return cp; 209 } 210 211 /** 212 * fc_lport_ptp_setup() - Create an rport for point-to-point mode 213 * @lport: The lport to attach the ptp rport to 214 * @fid: The FID of the ptp rport 215 * @remote_wwpn: The WWPN of the ptp rport 216 * @remote_wwnn: The WWNN of the ptp rport 217 */ 218 static void fc_lport_ptp_setup(struct fc_lport *lport, 219 u32 remote_fid, u64 remote_wwpn, 220 u64 remote_wwnn) 221 { 222 struct fc_disc_port dp; 223 224 dp.lp = lport; 225 dp.ids.port_id = remote_fid; 226 dp.ids.port_name = remote_wwpn; 227 dp.ids.node_name = remote_wwnn; 228 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; 229 230 if (lport->ptp_rp) { 231 lport->tt.rport_logoff(lport->ptp_rp); 232 lport->ptp_rp = NULL; 233 } 234 235 lport->ptp_rp = lport->tt.rport_create(&dp); 236 237 lport->tt.rport_login(lport->ptp_rp); 238 239 fc_lport_enter_ready(lport); 240 } 241 242 void fc_get_host_port_type(struct Scsi_Host *shost) 243 { 244 /* TODO - currently just NPORT */ 245 fc_host_port_type(shost) = FC_PORTTYPE_NPORT; 246 } 247 EXPORT_SYMBOL(fc_get_host_port_type); 248 249 void fc_get_host_port_state(struct Scsi_Host *shost) 250 { 251 struct fc_lport *lp = shost_priv(shost); 252 253 if (lp->link_up) 254 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 255 else 256 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 257 } 258 EXPORT_SYMBOL(fc_get_host_port_state); 259 260 void fc_get_host_speed(struct Scsi_Host *shost) 261 { 262 struct fc_lport *lport = shost_priv(shost); 263 264 fc_host_speed(shost) = lport->link_speed; 265 } 266 EXPORT_SYMBOL(fc_get_host_speed); 267 268 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) 269 { 270 struct fc_host_statistics *fcoe_stats; 271 struct fc_lport *lp = shost_priv(shost); 272 struct timespec v0, v1; 273 unsigned int cpu; 274 275 fcoe_stats = &lp->host_stats; 276 memset(fcoe_stats, 0, sizeof(struct fc_host_statistics)); 277 278 jiffies_to_timespec(jiffies, &v0); 279 jiffies_to_timespec(lp->boot_time, &v1); 280 fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); 281 282 for_each_possible_cpu(cpu) { 283 struct fcoe_dev_stats *stats; 284 285 stats = per_cpu_ptr(lp->dev_stats, cpu); 286 287 fcoe_stats->tx_frames += stats->TxFrames; 288 fcoe_stats->tx_words += stats->TxWords; 289 fcoe_stats->rx_frames += stats->RxFrames; 290 fcoe_stats->rx_words += stats->RxWords; 291 fcoe_stats->error_frames += stats->ErrorFrames; 292 fcoe_stats->invalid_crc_count += stats->InvalidCRCCount; 293 fcoe_stats->fcp_input_requests += stats->InputRequests; 294 fcoe_stats->fcp_output_requests += stats->OutputRequests; 295 fcoe_stats->fcp_control_requests += stats->ControlRequests; 296 fcoe_stats->fcp_input_megabytes += stats->InputMegabytes; 297 fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes; 298 fcoe_stats->link_failure_count += stats->LinkFailureCount; 299 } 300 fcoe_stats->lip_count = -1; 301 fcoe_stats->nos_count = -1; 302 fcoe_stats->loss_of_sync_count = -1; 303 fcoe_stats->loss_of_signal_count = -1; 304 fcoe_stats->prim_seq_protocol_err_count = -1; 305 fcoe_stats->dumped_frames = -1; 306 return fcoe_stats; 307 } 308 EXPORT_SYMBOL(fc_get_host_stats); 309 310 /* 311 * Fill in FLOGI command for request. 312 */ 313 static void 314 fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi, 315 unsigned int op) 316 { 317 struct fc_els_csp *sp; 318 struct fc_els_cssp *cp; 319 320 memset(flogi, 0, sizeof(*flogi)); 321 flogi->fl_cmd = (u8) op; 322 put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); 323 put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); 324 sp = &flogi->fl_csp; 325 sp->sp_hi_ver = 0x20; 326 sp->sp_lo_ver = 0x20; 327 sp->sp_bb_cred = htons(10); /* this gets set by gateway */ 328 sp->sp_bb_data = htons((u16) lport->mfs); 329 cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ 330 cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); 331 if (op != ELS_FLOGI) { 332 sp->sp_features = htons(FC_SP_FT_CIRO); 333 sp->sp_tot_seq = htons(255); /* seq. we accept */ 334 sp->sp_rel_off = htons(0x1f); 335 sp->sp_e_d_tov = htonl(lport->e_d_tov); 336 337 cp->cp_rdfs = htons((u16) lport->mfs); 338 cp->cp_con_seq = htons(255); 339 cp->cp_open_seq = 1; 340 } 341 } 342 343 /* 344 * Add a supported FC-4 type. 345 */ 346 static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) 347 { 348 __be32 *mp; 349 350 mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; 351 *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); 352 } 353 354 /** 355 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report. 356 * @lport: Fibre Channel local port recieving the RLIR 357 * @sp: current sequence in the RLIR exchange 358 * @fp: RLIR request frame 359 * 360 * Locking Note: The lport lock is exected to be held before calling 361 * this function. 362 */ 363 static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp, 364 struct fc_lport *lport) 365 { 366 FC_DEBUG_LPORT("Received RLIR request while in state %s\n", 367 fc_lport_state(lport)); 368 369 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 370 fc_frame_free(fp); 371 } 372 373 /** 374 * fc_lport_recv_echo_req() - Handle received ECHO request 375 * @lport: Fibre Channel local port recieving the ECHO 376 * @sp: current sequence in the ECHO exchange 377 * @fp: ECHO request frame 378 * 379 * Locking Note: The lport lock is exected to be held before calling 380 * this function. 381 */ 382 static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp, 383 struct fc_lport *lport) 384 { 385 struct fc_frame *fp; 386 struct fc_exch *ep = fc_seq_exch(sp); 387 unsigned int len; 388 void *pp; 389 void *dp; 390 u32 f_ctl; 391 392 FC_DEBUG_LPORT("Received RLIR request while in state %s\n", 393 fc_lport_state(lport)); 394 395 len = fr_len(in_fp) - sizeof(struct fc_frame_header); 396 pp = fc_frame_payload_get(in_fp, len); 397 398 if (len < sizeof(__be32)) 399 len = sizeof(__be32); 400 401 fp = fc_frame_alloc(lport, len); 402 if (fp) { 403 dp = fc_frame_payload_get(fp, len); 404 memcpy(dp, pp, len); 405 *((u32 *)dp) = htonl(ELS_LS_ACC << 24); 406 sp = lport->tt.seq_start_next(sp); 407 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; 408 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 409 FC_TYPE_ELS, f_ctl, 0); 410 lport->tt.seq_send(lport, sp, fp); 411 } 412 fc_frame_free(in_fp); 413 } 414 415 /** 416 * fc_lport_recv_echo_req() - Handle received Request Node ID data request 417 * @lport: Fibre Channel local port recieving the RNID 418 * @sp: current sequence in the RNID exchange 419 * @fp: RNID request frame 420 * 421 * Locking Note: The lport lock is exected to be held before calling 422 * this function. 423 */ 424 static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp, 425 struct fc_lport *lport) 426 { 427 struct fc_frame *fp; 428 struct fc_exch *ep = fc_seq_exch(sp); 429 struct fc_els_rnid *req; 430 struct { 431 struct fc_els_rnid_resp rnid; 432 struct fc_els_rnid_cid cid; 433 struct fc_els_rnid_gen gen; 434 } *rp; 435 struct fc_seq_els_data rjt_data; 436 u8 fmt; 437 size_t len; 438 u32 f_ctl; 439 440 FC_DEBUG_LPORT("Received RNID request while in state %s\n", 441 fc_lport_state(lport)); 442 443 req = fc_frame_payload_get(in_fp, sizeof(*req)); 444 if (!req) { 445 rjt_data.fp = NULL; 446 rjt_data.reason = ELS_RJT_LOGIC; 447 rjt_data.explan = ELS_EXPL_NONE; 448 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 449 } else { 450 fmt = req->rnid_fmt; 451 len = sizeof(*rp); 452 if (fmt != ELS_RNIDF_GEN || 453 ntohl(lport->rnid_gen.rnid_atype) == 0) { 454 fmt = ELS_RNIDF_NONE; /* nothing to provide */ 455 len -= sizeof(rp->gen); 456 } 457 fp = fc_frame_alloc(lport, len); 458 if (fp) { 459 rp = fc_frame_payload_get(fp, len); 460 memset(rp, 0, len); 461 rp->rnid.rnid_cmd = ELS_LS_ACC; 462 rp->rnid.rnid_fmt = fmt; 463 rp->rnid.rnid_cid_len = sizeof(rp->cid); 464 rp->cid.rnid_wwpn = htonll(lport->wwpn); 465 rp->cid.rnid_wwnn = htonll(lport->wwnn); 466 if (fmt == ELS_RNIDF_GEN) { 467 rp->rnid.rnid_sid_len = sizeof(rp->gen); 468 memcpy(&rp->gen, &lport->rnid_gen, 469 sizeof(rp->gen)); 470 } 471 sp = lport->tt.seq_start_next(sp); 472 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; 473 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 474 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 475 FC_TYPE_ELS, f_ctl, 0); 476 lport->tt.seq_send(lport, sp, fp); 477 } 478 } 479 fc_frame_free(in_fp); 480 } 481 482 /** 483 * fc_lport_recv_adisc_req() - Handle received Address Discovery Request 484 * @lport: Fibre Channel local port recieving the ADISC 485 * @sp: current sequence in the ADISC exchange 486 * @fp: ADISC request frame 487 * 488 * Locking Note: The lport lock is expected to be held before calling 489 * this function. 490 */ 491 static void fc_lport_recv_adisc_req(struct fc_seq *sp, struct fc_frame *in_fp, 492 struct fc_lport *lport) 493 { 494 struct fc_frame *fp; 495 struct fc_exch *ep = fc_seq_exch(sp); 496 struct fc_els_adisc *req, *rp; 497 struct fc_seq_els_data rjt_data; 498 size_t len; 499 u32 f_ctl; 500 501 FC_DEBUG_LPORT("Received ADISC request while in state %s\n", 502 fc_lport_state(lport)); 503 504 req = fc_frame_payload_get(in_fp, sizeof(*req)); 505 if (!req) { 506 rjt_data.fp = NULL; 507 rjt_data.reason = ELS_RJT_LOGIC; 508 rjt_data.explan = ELS_EXPL_NONE; 509 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 510 } else { 511 len = sizeof(*rp); 512 fp = fc_frame_alloc(lport, len); 513 if (fp) { 514 rp = fc_frame_payload_get(fp, len); 515 memset(rp, 0, len); 516 rp->adisc_cmd = ELS_LS_ACC; 517 rp->adisc_wwpn = htonll(lport->wwpn); 518 rp->adisc_wwnn = htonll(lport->wwnn); 519 hton24(rp->adisc_port_id, 520 fc_host_port_id(lport->host)); 521 sp = lport->tt.seq_start_next(sp); 522 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; 523 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 524 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 525 FC_TYPE_ELS, f_ctl, 0); 526 lport->tt.seq_send(lport, sp, fp); 527 } 528 } 529 fc_frame_free(in_fp); 530 } 531 532 /** 533 * fc_lport_recv_logo_req() - Handle received fabric LOGO request 534 * @lport: Fibre Channel local port recieving the LOGO 535 * @sp: current sequence in the LOGO exchange 536 * @fp: LOGO request frame 537 * 538 * Locking Note: The lport lock is exected to be held before calling 539 * this function. 540 */ 541 static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp, 542 struct fc_lport *lport) 543 { 544 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 545 fc_lport_enter_reset(lport); 546 fc_frame_free(fp); 547 } 548 549 /** 550 * fc_fabric_login() - Start the lport state machine 551 * @lport: The lport that should log into the fabric 552 * 553 * Locking Note: This function should not be called 554 * with the lport lock held. 555 */ 556 int fc_fabric_login(struct fc_lport *lport) 557 { 558 int rc = -1; 559 560 mutex_lock(&lport->lp_mutex); 561 if (lport->state == LPORT_ST_NONE) { 562 fc_lport_enter_reset(lport); 563 rc = 0; 564 } 565 mutex_unlock(&lport->lp_mutex); 566 567 return rc; 568 } 569 EXPORT_SYMBOL(fc_fabric_login); 570 571 /** 572 * fc_linkup() - Handler for transport linkup events 573 * @lport: The lport whose link is up 574 */ 575 void fc_linkup(struct fc_lport *lport) 576 { 577 FC_DEBUG_LPORT("Link is up for port (%6x)\n", 578 fc_host_port_id(lport->host)); 579 580 mutex_lock(&lport->lp_mutex); 581 if (!lport->link_up) { 582 lport->link_up = 1; 583 584 if (lport->state == LPORT_ST_RESET) 585 fc_lport_enter_flogi(lport); 586 } 587 mutex_unlock(&lport->lp_mutex); 588 } 589 EXPORT_SYMBOL(fc_linkup); 590 591 /** 592 * fc_linkdown() - Handler for transport linkdown events 593 * @lport: The lport whose link is down 594 */ 595 void fc_linkdown(struct fc_lport *lport) 596 { 597 mutex_lock(&lport->lp_mutex); 598 FC_DEBUG_LPORT("Link is down for port (%6x)\n", 599 fc_host_port_id(lport->host)); 600 601 if (lport->link_up) { 602 lport->link_up = 0; 603 fc_lport_enter_reset(lport); 604 lport->tt.fcp_cleanup(lport); 605 } 606 mutex_unlock(&lport->lp_mutex); 607 } 608 EXPORT_SYMBOL(fc_linkdown); 609 610 /** 611 * fc_fabric_logoff() - Logout of the fabric 612 * @lport: fc_lport pointer to logoff the fabric 613 * 614 * Return value: 615 * 0 for success, -1 for failure 616 */ 617 int fc_fabric_logoff(struct fc_lport *lport) 618 { 619 lport->tt.disc_stop_final(lport); 620 mutex_lock(&lport->lp_mutex); 621 if (lport->dns_rp) 622 lport->tt.rport_logoff(lport->dns_rp); 623 mutex_unlock(&lport->lp_mutex); 624 lport->tt.rport_flush_queue(); 625 mutex_lock(&lport->lp_mutex); 626 fc_lport_enter_logo(lport); 627 mutex_unlock(&lport->lp_mutex); 628 cancel_delayed_work_sync(&lport->retry_work); 629 return 0; 630 } 631 EXPORT_SYMBOL(fc_fabric_logoff); 632 633 /** 634 * fc_lport_destroy() - unregister a fc_lport 635 * @lport: fc_lport pointer to unregister 636 * 637 * Return value: 638 * None 639 * Note: 640 * exit routine for fc_lport instance 641 * clean-up all the allocated memory 642 * and free up other system resources. 643 * 644 */ 645 int fc_lport_destroy(struct fc_lport *lport) 646 { 647 mutex_lock(&lport->lp_mutex); 648 lport->state = LPORT_ST_NONE; 649 lport->link_up = 0; 650 lport->tt.frame_send = fc_frame_drop; 651 mutex_unlock(&lport->lp_mutex); 652 653 lport->tt.fcp_abort_io(lport); 654 lport->tt.exch_mgr_reset(lport, 0, 0); 655 return 0; 656 } 657 EXPORT_SYMBOL(fc_lport_destroy); 658 659 /** 660 * fc_set_mfs() - sets up the mfs for the corresponding fc_lport 661 * @lport: fc_lport pointer to unregister 662 * @mfs: the new mfs for fc_lport 663 * 664 * Set mfs for the given fc_lport to the new mfs. 665 * 666 * Return: 0 for success 667 */ 668 int fc_set_mfs(struct fc_lport *lport, u32 mfs) 669 { 670 unsigned int old_mfs; 671 int rc = -EINVAL; 672 673 mutex_lock(&lport->lp_mutex); 674 675 old_mfs = lport->mfs; 676 677 if (mfs >= FC_MIN_MAX_FRAME) { 678 mfs &= ~3; 679 if (mfs > FC_MAX_FRAME) 680 mfs = FC_MAX_FRAME; 681 mfs -= sizeof(struct fc_frame_header); 682 lport->mfs = mfs; 683 rc = 0; 684 } 685 686 if (!rc && mfs < old_mfs) 687 fc_lport_enter_reset(lport); 688 689 mutex_unlock(&lport->lp_mutex); 690 691 return rc; 692 } 693 EXPORT_SYMBOL(fc_set_mfs); 694 695 /** 696 * fc_lport_disc_callback() - Callback for discovery events 697 * @lport: FC local port 698 * @event: The discovery event 699 */ 700 void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) 701 { 702 switch (event) { 703 case DISC_EV_SUCCESS: 704 FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n", 705 fc_host_port_id(lport->host)); 706 break; 707 case DISC_EV_FAILED: 708 FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n", 709 fc_host_port_id(lport->host)); 710 mutex_lock(&lport->lp_mutex); 711 fc_lport_enter_reset(lport); 712 mutex_unlock(&lport->lp_mutex); 713 break; 714 case DISC_EV_NONE: 715 WARN_ON(1); 716 break; 717 } 718 } 719 720 /** 721 * fc_rport_enter_ready() - Enter the ready state and start discovery 722 * @lport: Fibre Channel local port that is ready 723 * 724 * Locking Note: The lport lock is expected to be held before calling 725 * this routine. 726 */ 727 static void fc_lport_enter_ready(struct fc_lport *lport) 728 { 729 FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n", 730 fc_host_port_id(lport->host), fc_lport_state(lport)); 731 732 fc_lport_state_enter(lport, LPORT_ST_READY); 733 734 lport->tt.disc_start(fc_lport_disc_callback, lport); 735 } 736 737 /** 738 * fc_lport_recv_flogi_req() - Receive a FLOGI request 739 * @sp_in: The sequence the FLOGI is on 740 * @rx_fp: The frame the FLOGI is in 741 * @lport: The lport that recieved the request 742 * 743 * A received FLOGI request indicates a point-to-point connection. 744 * Accept it with the common service parameters indicating our N port. 745 * Set up to do a PLOGI if we have the higher-number WWPN. 746 * 747 * Locking Note: The lport lock is exected to be held before calling 748 * this function. 749 */ 750 static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, 751 struct fc_frame *rx_fp, 752 struct fc_lport *lport) 753 { 754 struct fc_frame *fp; 755 struct fc_frame_header *fh; 756 struct fc_seq *sp; 757 struct fc_exch *ep; 758 struct fc_els_flogi *flp; 759 struct fc_els_flogi *new_flp; 760 u64 remote_wwpn; 761 u32 remote_fid; 762 u32 local_fid; 763 u32 f_ctl; 764 765 FC_DEBUG_LPORT("Received FLOGI request while in state %s\n", 766 fc_lport_state(lport)); 767 768 fh = fc_frame_header_get(rx_fp); 769 remote_fid = ntoh24(fh->fh_s_id); 770 flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); 771 if (!flp) 772 goto out; 773 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); 774 if (remote_wwpn == lport->wwpn) { 775 FC_DBG("FLOGI from port with same WWPN %llx " 776 "possible configuration error\n", 777 (unsigned long long)remote_wwpn); 778 goto out; 779 } 780 FC_DBG("FLOGI from port WWPN %llx\n", (unsigned long long)remote_wwpn); 781 782 /* 783 * XXX what is the right thing to do for FIDs? 784 * The originator might expect our S_ID to be 0xfffffe. 785 * But if so, both of us could end up with the same FID. 786 */ 787 local_fid = FC_LOCAL_PTP_FID_LO; 788 if (remote_wwpn < lport->wwpn) { 789 local_fid = FC_LOCAL_PTP_FID_HI; 790 if (!remote_fid || remote_fid == local_fid) 791 remote_fid = FC_LOCAL_PTP_FID_LO; 792 } else if (!remote_fid) { 793 remote_fid = FC_LOCAL_PTP_FID_HI; 794 } 795 796 fc_host_port_id(lport->host) = local_fid; 797 798 fp = fc_frame_alloc(lport, sizeof(*flp)); 799 if (fp) { 800 sp = lport->tt.seq_start_next(fr_seq(rx_fp)); 801 new_flp = fc_frame_payload_get(fp, sizeof(*flp)); 802 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); 803 new_flp->fl_cmd = (u8) ELS_LS_ACC; 804 805 /* 806 * Send the response. If this fails, the originator should 807 * repeat the sequence. 808 */ 809 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; 810 ep = fc_seq_exch(sp); 811 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 812 FC_TYPE_ELS, f_ctl, 0); 813 lport->tt.seq_send(lport, sp, fp); 814 815 } else { 816 fc_lport_error(lport, fp); 817 } 818 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, 819 get_unaligned_be64(&flp->fl_wwnn)); 820 821 lport->tt.disc_start(fc_lport_disc_callback, lport); 822 823 out: 824 sp = fr_seq(rx_fp); 825 fc_frame_free(rx_fp); 826 } 827 828 /** 829 * fc_lport_recv_req() - The generic lport request handler 830 * @lport: The lport that received the request 831 * @sp: The sequence the request is on 832 * @fp: The frame the request is in 833 * 834 * This function will see if the lport handles the request or 835 * if an rport should handle the request. 836 * 837 * Locking Note: This function should not be called with the lport 838 * lock held becuase it will grab the lock. 839 */ 840 static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, 841 struct fc_frame *fp) 842 { 843 struct fc_frame_header *fh = fc_frame_header_get(fp); 844 void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); 845 struct fc_rport *rport; 846 u32 s_id; 847 u32 d_id; 848 struct fc_seq_els_data rjt_data; 849 850 mutex_lock(&lport->lp_mutex); 851 852 /* 853 * Handle special ELS cases like FLOGI, LOGO, and 854 * RSCN here. These don't require a session. 855 * Even if we had a session, it might not be ready. 856 */ 857 if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) { 858 /* 859 * Check opcode. 860 */ 861 recv = NULL; 862 switch (fc_frame_payload_op(fp)) { 863 case ELS_FLOGI: 864 recv = fc_lport_recv_flogi_req; 865 break; 866 case ELS_LOGO: 867 fh = fc_frame_header_get(fp); 868 if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) 869 recv = fc_lport_recv_logo_req; 870 break; 871 case ELS_RSCN: 872 recv = lport->tt.disc_recv_req; 873 break; 874 case ELS_ECHO: 875 recv = fc_lport_recv_echo_req; 876 break; 877 case ELS_RLIR: 878 recv = fc_lport_recv_rlir_req; 879 break; 880 case ELS_RNID: 881 recv = fc_lport_recv_rnid_req; 882 break; 883 case ELS_ADISC: 884 recv = fc_lport_recv_adisc_req; 885 break; 886 } 887 888 if (recv) 889 recv(sp, fp, lport); 890 else { 891 /* 892 * Find session. 893 * If this is a new incoming PLOGI, we won't find it. 894 */ 895 s_id = ntoh24(fh->fh_s_id); 896 d_id = ntoh24(fh->fh_d_id); 897 898 rport = lport->tt.rport_lookup(lport, s_id); 899 if (rport) 900 lport->tt.rport_recv_req(sp, fp, rport); 901 else { 902 rjt_data.fp = NULL; 903 rjt_data.reason = ELS_RJT_UNAB; 904 rjt_data.explan = ELS_EXPL_NONE; 905 lport->tt.seq_els_rsp_send(sp, 906 ELS_LS_RJT, 907 &rjt_data); 908 fc_frame_free(fp); 909 } 910 } 911 } else { 912 FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp)); 913 fc_frame_free(fp); 914 } 915 mutex_unlock(&lport->lp_mutex); 916 917 /* 918 * The common exch_done for all request may not be good 919 * if any request requires longer hold on exhange. XXX 920 */ 921 lport->tt.exch_done(sp); 922 } 923 924 /** 925 * fc_lport_reset() - Reset an lport 926 * @lport: The lport which should be reset 927 * 928 * Locking Note: This functions should not be called with the 929 * lport lock held. 930 */ 931 int fc_lport_reset(struct fc_lport *lport) 932 { 933 cancel_delayed_work_sync(&lport->retry_work); 934 mutex_lock(&lport->lp_mutex); 935 fc_lport_enter_reset(lport); 936 mutex_unlock(&lport->lp_mutex); 937 return 0; 938 } 939 EXPORT_SYMBOL(fc_lport_reset); 940 941 /** 942 * fc_rport_enter_reset() - Reset the local port 943 * @lport: Fibre Channel local port to be reset 944 * 945 * Locking Note: The lport lock is expected to be held before calling 946 * this routine. 947 */ 948 static void fc_lport_enter_reset(struct fc_lport *lport) 949 { 950 FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n", 951 fc_host_port_id(lport->host), fc_lport_state(lport)); 952 953 fc_lport_state_enter(lport, LPORT_ST_RESET); 954 955 if (lport->dns_rp) 956 lport->tt.rport_logoff(lport->dns_rp); 957 958 if (lport->ptp_rp) { 959 lport->tt.rport_logoff(lport->ptp_rp); 960 lport->ptp_rp = NULL; 961 } 962 963 lport->tt.disc_stop(lport); 964 965 lport->tt.exch_mgr_reset(lport, 0, 0); 966 fc_host_fabric_name(lport->host) = 0; 967 fc_host_port_id(lport->host) = 0; 968 969 if (lport->link_up) 970 fc_lport_enter_flogi(lport); 971 } 972 973 /** 974 * fc_lport_error() - Handler for any errors 975 * @lport: The fc_lport object 976 * @fp: The frame pointer 977 * 978 * If the error was caused by a resource allocation failure 979 * then wait for half a second and retry, otherwise retry 980 * after the e_d_tov time. 981 */ 982 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) 983 { 984 unsigned long delay = 0; 985 FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n", 986 PTR_ERR(fp), fc_lport_state(lport), 987 lport->retry_count); 988 989 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 990 /* 991 * Memory allocation failure, or the exchange timed out. 992 * Retry after delay 993 */ 994 if (lport->retry_count < lport->max_retry_count) { 995 lport->retry_count++; 996 if (!fp) 997 delay = msecs_to_jiffies(500); 998 else 999 delay = msecs_to_jiffies(lport->e_d_tov); 1000 1001 schedule_delayed_work(&lport->retry_work, delay); 1002 } else { 1003 switch (lport->state) { 1004 case LPORT_ST_NONE: 1005 case LPORT_ST_READY: 1006 case LPORT_ST_RESET: 1007 case LPORT_ST_RPN_ID: 1008 case LPORT_ST_RFT_ID: 1009 case LPORT_ST_SCR: 1010 case LPORT_ST_DNS: 1011 case LPORT_ST_FLOGI: 1012 case LPORT_ST_LOGO: 1013 fc_lport_enter_reset(lport); 1014 break; 1015 } 1016 } 1017 } 1018 } 1019 1020 /** 1021 * fc_lport_rft_id_resp() - Handle response to Register Fibre 1022 * Channel Types by ID (RPN_ID) request 1023 * @sp: current sequence in RPN_ID exchange 1024 * @fp: response frame 1025 * @lp_arg: Fibre Channel host port instance 1026 * 1027 * Locking Note: This function will be called without the lport lock 1028 * held, but it will lock, call an _enter_* function or fc_lport_error 1029 * and then unlock the lport. 1030 */ 1031 static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1032 void *lp_arg) 1033 { 1034 struct fc_lport *lport = lp_arg; 1035 struct fc_frame_header *fh; 1036 struct fc_ct_hdr *ct; 1037 1038 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1039 return; 1040 1041 mutex_lock(&lport->lp_mutex); 1042 1043 FC_DEBUG_LPORT("Received a RFT_ID response\n"); 1044 1045 if (lport->state != LPORT_ST_RFT_ID) { 1046 FC_DBG("Received a RFT_ID response, but in state %s\n", 1047 fc_lport_state(lport)); 1048 if (IS_ERR(fp)) 1049 goto err; 1050 goto out; 1051 } 1052 1053 if (IS_ERR(fp)) { 1054 fc_lport_error(lport, fp); 1055 goto err; 1056 } 1057 1058 fh = fc_frame_header_get(fp); 1059 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1060 1061 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1062 ct->ct_fs_type == FC_FST_DIR && 1063 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1064 ntohs(ct->ct_cmd) == FC_FS_ACC) 1065 fc_lport_enter_scr(lport); 1066 else 1067 fc_lport_error(lport, fp); 1068 out: 1069 fc_frame_free(fp); 1070 err: 1071 mutex_unlock(&lport->lp_mutex); 1072 } 1073 1074 /** 1075 * fc_lport_rpn_id_resp() - Handle response to Register Port 1076 * Name by ID (RPN_ID) request 1077 * @sp: current sequence in RPN_ID exchange 1078 * @fp: response frame 1079 * @lp_arg: Fibre Channel host port instance 1080 * 1081 * Locking Note: This function will be called without the lport lock 1082 * held, but it will lock, call an _enter_* function or fc_lport_error 1083 * and then unlock the lport. 1084 */ 1085 static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1086 void *lp_arg) 1087 { 1088 struct fc_lport *lport = lp_arg; 1089 struct fc_frame_header *fh; 1090 struct fc_ct_hdr *ct; 1091 1092 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1093 return; 1094 1095 mutex_lock(&lport->lp_mutex); 1096 1097 FC_DEBUG_LPORT("Received a RPN_ID response\n"); 1098 1099 if (lport->state != LPORT_ST_RPN_ID) { 1100 FC_DBG("Received a RPN_ID response, but in state %s\n", 1101 fc_lport_state(lport)); 1102 if (IS_ERR(fp)) 1103 goto err; 1104 goto out; 1105 } 1106 1107 if (IS_ERR(fp)) { 1108 fc_lport_error(lport, fp); 1109 goto err; 1110 } 1111 1112 fh = fc_frame_header_get(fp); 1113 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1114 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1115 ct->ct_fs_type == FC_FST_DIR && 1116 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1117 ntohs(ct->ct_cmd) == FC_FS_ACC) 1118 fc_lport_enter_rft_id(lport); 1119 else 1120 fc_lport_error(lport, fp); 1121 1122 out: 1123 fc_frame_free(fp); 1124 err: 1125 mutex_unlock(&lport->lp_mutex); 1126 } 1127 1128 /** 1129 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request 1130 * @sp: current sequence in SCR exchange 1131 * @fp: response frame 1132 * @lp_arg: Fibre Channel lport port instance that sent the registration request 1133 * 1134 * Locking Note: This function will be called without the lport lock 1135 * held, but it will lock, call an _enter_* function or fc_lport_error 1136 * and then unlock the lport. 1137 */ 1138 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, 1139 void *lp_arg) 1140 { 1141 struct fc_lport *lport = lp_arg; 1142 u8 op; 1143 1144 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1145 return; 1146 1147 mutex_lock(&lport->lp_mutex); 1148 1149 FC_DEBUG_LPORT("Received a SCR response\n"); 1150 1151 if (lport->state != LPORT_ST_SCR) { 1152 FC_DBG("Received a SCR response, but in state %s\n", 1153 fc_lport_state(lport)); 1154 if (IS_ERR(fp)) 1155 goto err; 1156 goto out; 1157 } 1158 1159 if (IS_ERR(fp)) { 1160 fc_lport_error(lport, fp); 1161 goto err; 1162 } 1163 1164 op = fc_frame_payload_op(fp); 1165 if (op == ELS_LS_ACC) 1166 fc_lport_enter_ready(lport); 1167 else 1168 fc_lport_error(lport, fp); 1169 1170 out: 1171 fc_frame_free(fp); 1172 err: 1173 mutex_unlock(&lport->lp_mutex); 1174 } 1175 1176 /** 1177 * fc_lport_enter_scr() - Send a State Change Register (SCR) request 1178 * @lport: Fibre Channel local port to register for state changes 1179 * 1180 * Locking Note: The lport lock is expected to be held before calling 1181 * this routine. 1182 */ 1183 static void fc_lport_enter_scr(struct fc_lport *lport) 1184 { 1185 struct fc_frame *fp; 1186 1187 FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n", 1188 fc_host_port_id(lport->host), fc_lport_state(lport)); 1189 1190 fc_lport_state_enter(lport, LPORT_ST_SCR); 1191 1192 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); 1193 if (!fp) { 1194 fc_lport_error(lport, fp); 1195 return; 1196 } 1197 1198 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR, 1199 fc_lport_scr_resp, lport, lport->e_d_tov)) 1200 fc_lport_error(lport, fp); 1201 } 1202 1203 /** 1204 * fc_lport_enter_rft_id() - Register FC4-types with the name server 1205 * @lport: Fibre Channel local port to register 1206 * 1207 * Locking Note: The lport lock is expected to be held before calling 1208 * this routine. 1209 */ 1210 static void fc_lport_enter_rft_id(struct fc_lport *lport) 1211 { 1212 struct fc_frame *fp; 1213 struct fc_ns_fts *lps; 1214 int i; 1215 1216 FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n", 1217 fc_host_port_id(lport->host), fc_lport_state(lport)); 1218 1219 fc_lport_state_enter(lport, LPORT_ST_RFT_ID); 1220 1221 lps = &lport->fcts; 1222 i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); 1223 while (--i >= 0) 1224 if (ntohl(lps->ff_type_map[i]) != 0) 1225 break; 1226 if (i < 0) { 1227 /* nothing to register, move on to SCR */ 1228 fc_lport_enter_scr(lport); 1229 return; 1230 } 1231 1232 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1233 sizeof(struct fc_ns_rft)); 1234 if (!fp) { 1235 fc_lport_error(lport, fp); 1236 return; 1237 } 1238 1239 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID, 1240 fc_lport_rft_id_resp, 1241 lport, lport->e_d_tov)) 1242 fc_lport_error(lport, fp); 1243 } 1244 1245 /** 1246 * fc_rport_enter_rft_id() - Register port name with the name server 1247 * @lport: Fibre Channel local port to register 1248 * 1249 * Locking Note: The lport lock is expected to be held before calling 1250 * this routine. 1251 */ 1252 static void fc_lport_enter_rpn_id(struct fc_lport *lport) 1253 { 1254 struct fc_frame *fp; 1255 1256 FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n", 1257 fc_host_port_id(lport->host), fc_lport_state(lport)); 1258 1259 fc_lport_state_enter(lport, LPORT_ST_RPN_ID); 1260 1261 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1262 sizeof(struct fc_ns_rn_id)); 1263 if (!fp) { 1264 fc_lport_error(lport, fp); 1265 return; 1266 } 1267 1268 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID, 1269 fc_lport_rpn_id_resp, 1270 lport, lport->e_d_tov)) 1271 fc_lport_error(lport, fp); 1272 } 1273 1274 static struct fc_rport_operations fc_lport_rport_ops = { 1275 .event_callback = fc_lport_rport_callback, 1276 }; 1277 1278 /** 1279 * fc_rport_enter_dns() - Create a rport to the name server 1280 * @lport: Fibre Channel local port requesting a rport for the name server 1281 * 1282 * Locking Note: The lport lock is expected to be held before calling 1283 * this routine. 1284 */ 1285 static void fc_lport_enter_dns(struct fc_lport *lport) 1286 { 1287 struct fc_rport *rport; 1288 struct fc_rport_libfc_priv *rdata; 1289 struct fc_disc_port dp; 1290 1291 dp.ids.port_id = FC_FID_DIR_SERV; 1292 dp.ids.port_name = -1; 1293 dp.ids.node_name = -1; 1294 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; 1295 dp.lp = lport; 1296 1297 FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n", 1298 fc_host_port_id(lport->host), fc_lport_state(lport)); 1299 1300 fc_lport_state_enter(lport, LPORT_ST_DNS); 1301 1302 rport = lport->tt.rport_create(&dp); 1303 if (!rport) 1304 goto err; 1305 1306 rdata = rport->dd_data; 1307 rdata->ops = &fc_lport_rport_ops; 1308 lport->tt.rport_login(rport); 1309 return; 1310 1311 err: 1312 fc_lport_error(lport, NULL); 1313 } 1314 1315 /** 1316 * fc_lport_timeout() - Handler for the retry_work timer. 1317 * @work: The work struct of the fc_lport 1318 */ 1319 static void fc_lport_timeout(struct work_struct *work) 1320 { 1321 struct fc_lport *lport = 1322 container_of(work, struct fc_lport, 1323 retry_work.work); 1324 1325 mutex_lock(&lport->lp_mutex); 1326 1327 switch (lport->state) { 1328 case LPORT_ST_NONE: 1329 case LPORT_ST_READY: 1330 case LPORT_ST_RESET: 1331 WARN_ON(1); 1332 break; 1333 case LPORT_ST_FLOGI: 1334 fc_lport_enter_flogi(lport); 1335 break; 1336 case LPORT_ST_DNS: 1337 fc_lport_enter_dns(lport); 1338 break; 1339 case LPORT_ST_RPN_ID: 1340 fc_lport_enter_rpn_id(lport); 1341 break; 1342 case LPORT_ST_RFT_ID: 1343 fc_lport_enter_rft_id(lport); 1344 break; 1345 case LPORT_ST_SCR: 1346 fc_lport_enter_scr(lport); 1347 break; 1348 case LPORT_ST_LOGO: 1349 fc_lport_enter_logo(lport); 1350 break; 1351 } 1352 1353 mutex_unlock(&lport->lp_mutex); 1354 } 1355 1356 /** 1357 * fc_lport_logo_resp() - Handle response to LOGO request 1358 * @sp: current sequence in LOGO exchange 1359 * @fp: response frame 1360 * @lp_arg: Fibre Channel lport port instance that sent the LOGO request 1361 * 1362 * Locking Note: This function will be called without the lport lock 1363 * held, but it will lock, call an _enter_* function or fc_lport_error 1364 * and then unlock the lport. 1365 */ 1366 static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1367 void *lp_arg) 1368 { 1369 struct fc_lport *lport = lp_arg; 1370 u8 op; 1371 1372 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1373 return; 1374 1375 mutex_lock(&lport->lp_mutex); 1376 1377 FC_DEBUG_LPORT("Received a LOGO response\n"); 1378 1379 if (lport->state != LPORT_ST_LOGO) { 1380 FC_DBG("Received a LOGO response, but in state %s\n", 1381 fc_lport_state(lport)); 1382 if (IS_ERR(fp)) 1383 goto err; 1384 goto out; 1385 } 1386 1387 if (IS_ERR(fp)) { 1388 fc_lport_error(lport, fp); 1389 goto err; 1390 } 1391 1392 op = fc_frame_payload_op(fp); 1393 if (op == ELS_LS_ACC) 1394 fc_lport_enter_reset(lport); 1395 else 1396 fc_lport_error(lport, fp); 1397 1398 out: 1399 fc_frame_free(fp); 1400 err: 1401 mutex_unlock(&lport->lp_mutex); 1402 } 1403 1404 /** 1405 * fc_rport_enter_logo() - Logout of the fabric 1406 * @lport: Fibre Channel local port to be logged out 1407 * 1408 * Locking Note: The lport lock is expected to be held before calling 1409 * this routine. 1410 */ 1411 static void fc_lport_enter_logo(struct fc_lport *lport) 1412 { 1413 struct fc_frame *fp; 1414 struct fc_els_logo *logo; 1415 1416 FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n", 1417 fc_host_port_id(lport->host), fc_lport_state(lport)); 1418 1419 fc_lport_state_enter(lport, LPORT_ST_LOGO); 1420 1421 fp = fc_frame_alloc(lport, sizeof(*logo)); 1422 if (!fp) { 1423 fc_lport_error(lport, fp); 1424 return; 1425 } 1426 1427 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp, 1428 lport, lport->e_d_tov)) 1429 fc_lport_error(lport, fp); 1430 } 1431 1432 /** 1433 * fc_lport_flogi_resp() - Handle response to FLOGI request 1434 * @sp: current sequence in FLOGI exchange 1435 * @fp: response frame 1436 * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request 1437 * 1438 * Locking Note: This function will be called without the lport lock 1439 * held, but it will lock, call an _enter_* function or fc_lport_error 1440 * and then unlock the lport. 1441 */ 1442 static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 1443 void *lp_arg) 1444 { 1445 struct fc_lport *lport = lp_arg; 1446 struct fc_frame_header *fh; 1447 struct fc_els_flogi *flp; 1448 u32 did; 1449 u16 csp_flags; 1450 unsigned int r_a_tov; 1451 unsigned int e_d_tov; 1452 u16 mfs; 1453 1454 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1455 return; 1456 1457 mutex_lock(&lport->lp_mutex); 1458 1459 FC_DEBUG_LPORT("Received a FLOGI response\n"); 1460 1461 if (lport->state != LPORT_ST_FLOGI) { 1462 FC_DBG("Received a FLOGI response, but in state %s\n", 1463 fc_lport_state(lport)); 1464 if (IS_ERR(fp)) 1465 goto err; 1466 goto out; 1467 } 1468 1469 if (IS_ERR(fp)) { 1470 fc_lport_error(lport, fp); 1471 goto err; 1472 } 1473 1474 fh = fc_frame_header_get(fp); 1475 did = ntoh24(fh->fh_d_id); 1476 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { 1477 1478 FC_DEBUG_LPORT("Assigned fid %x\n", did); 1479 fc_host_port_id(lport->host) = did; 1480 1481 flp = fc_frame_payload_get(fp, sizeof(*flp)); 1482 if (flp) { 1483 mfs = ntohs(flp->fl_csp.sp_bb_data) & 1484 FC_SP_BB_DATA_MASK; 1485 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && 1486 mfs < lport->mfs) 1487 lport->mfs = mfs; 1488 csp_flags = ntohs(flp->fl_csp.sp_features); 1489 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); 1490 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); 1491 if (csp_flags & FC_SP_FT_EDTR) 1492 e_d_tov /= 1000000; 1493 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1494 if (e_d_tov > lport->e_d_tov) 1495 lport->e_d_tov = e_d_tov; 1496 lport->r_a_tov = 2 * e_d_tov; 1497 FC_DBG("Point-to-Point mode\n"); 1498 fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), 1499 get_unaligned_be64( 1500 &flp->fl_wwpn), 1501 get_unaligned_be64( 1502 &flp->fl_wwnn)); 1503 } else { 1504 lport->e_d_tov = e_d_tov; 1505 lport->r_a_tov = r_a_tov; 1506 fc_host_fabric_name(lport->host) = 1507 get_unaligned_be64(&flp->fl_wwnn); 1508 fc_lport_enter_dns(lport); 1509 } 1510 } 1511 1512 if (flp) { 1513 csp_flags = ntohs(flp->fl_csp.sp_features); 1514 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1515 lport->tt.disc_start(fc_lport_disc_callback, 1516 lport); 1517 } 1518 } 1519 } else { 1520 FC_DBG("bad FLOGI response\n"); 1521 } 1522 1523 out: 1524 fc_frame_free(fp); 1525 err: 1526 mutex_unlock(&lport->lp_mutex); 1527 } 1528 1529 /** 1530 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager 1531 * @lport: Fibre Channel local port to be logged in to the fabric 1532 * 1533 * Locking Note: The lport lock is expected to be held before calling 1534 * this routine. 1535 */ 1536 void fc_lport_enter_flogi(struct fc_lport *lport) 1537 { 1538 struct fc_frame *fp; 1539 1540 FC_DEBUG_LPORT("Processing FLOGI state\n"); 1541 1542 fc_lport_state_enter(lport, LPORT_ST_FLOGI); 1543 1544 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 1545 if (!fp) 1546 return fc_lport_error(lport, fp); 1547 1548 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI, 1549 fc_lport_flogi_resp, lport, lport->e_d_tov)) 1550 fc_lport_error(lport, fp); 1551 } 1552 1553 /* Configure a fc_lport */ 1554 int fc_lport_config(struct fc_lport *lport) 1555 { 1556 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); 1557 mutex_init(&lport->lp_mutex); 1558 1559 fc_lport_state_enter(lport, LPORT_ST_NONE); 1560 1561 fc_lport_add_fc4_type(lport, FC_TYPE_FCP); 1562 fc_lport_add_fc4_type(lport, FC_TYPE_CT); 1563 1564 return 0; 1565 } 1566 EXPORT_SYMBOL(fc_lport_config); 1567 1568 int fc_lport_init(struct fc_lport *lport) 1569 { 1570 if (!lport->tt.lport_recv) 1571 lport->tt.lport_recv = fc_lport_recv_req; 1572 1573 if (!lport->tt.lport_reset) 1574 lport->tt.lport_reset = fc_lport_reset; 1575 1576 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; 1577 fc_host_node_name(lport->host) = lport->wwnn; 1578 fc_host_port_name(lport->host) = lport->wwpn; 1579 fc_host_supported_classes(lport->host) = FC_COS_CLASS3; 1580 memset(fc_host_supported_fc4s(lport->host), 0, 1581 sizeof(fc_host_supported_fc4s(lport->host))); 1582 fc_host_supported_fc4s(lport->host)[2] = 1; 1583 fc_host_supported_fc4s(lport->host)[7] = 1; 1584 1585 /* This value is also unchanging */ 1586 memset(fc_host_active_fc4s(lport->host), 0, 1587 sizeof(fc_host_active_fc4s(lport->host))); 1588 fc_host_active_fc4s(lport->host)[2] = 1; 1589 fc_host_active_fc4s(lport->host)[7] = 1; 1590 fc_host_maxframe_size(lport->host) = lport->mfs; 1591 fc_host_supported_speeds(lport->host) = 0; 1592 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) 1593 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; 1594 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) 1595 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; 1596 1597 return 0; 1598 } 1599 EXPORT_SYMBOL(fc_lport_init); 1600