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