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 lport->tt.frame_send = fc_frame_drop; 648 lport->tt.fcp_abort_io(lport); 649 lport->tt.exch_mgr_reset(lport, 0, 0); 650 return 0; 651 } 652 EXPORT_SYMBOL(fc_lport_destroy); 653 654 /** 655 * fc_set_mfs() - sets up the mfs for the corresponding fc_lport 656 * @lport: fc_lport pointer to unregister 657 * @mfs: the new mfs for fc_lport 658 * 659 * Set mfs for the given fc_lport to the new mfs. 660 * 661 * Return: 0 for success 662 */ 663 int fc_set_mfs(struct fc_lport *lport, u32 mfs) 664 { 665 unsigned int old_mfs; 666 int rc = -EINVAL; 667 668 mutex_lock(&lport->lp_mutex); 669 670 old_mfs = lport->mfs; 671 672 if (mfs >= FC_MIN_MAX_FRAME) { 673 mfs &= ~3; 674 if (mfs > FC_MAX_FRAME) 675 mfs = FC_MAX_FRAME; 676 mfs -= sizeof(struct fc_frame_header); 677 lport->mfs = mfs; 678 rc = 0; 679 } 680 681 if (!rc && mfs < old_mfs) 682 fc_lport_enter_reset(lport); 683 684 mutex_unlock(&lport->lp_mutex); 685 686 return rc; 687 } 688 EXPORT_SYMBOL(fc_set_mfs); 689 690 /** 691 * fc_lport_disc_callback() - Callback for discovery events 692 * @lport: FC local port 693 * @event: The discovery event 694 */ 695 void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) 696 { 697 switch (event) { 698 case DISC_EV_SUCCESS: 699 FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n", 700 fc_host_port_id(lport->host)); 701 break; 702 case DISC_EV_FAILED: 703 FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n", 704 fc_host_port_id(lport->host)); 705 mutex_lock(&lport->lp_mutex); 706 fc_lport_enter_reset(lport); 707 mutex_unlock(&lport->lp_mutex); 708 break; 709 case DISC_EV_NONE: 710 WARN_ON(1); 711 break; 712 } 713 } 714 715 /** 716 * fc_rport_enter_ready() - Enter the ready state and start discovery 717 * @lport: Fibre Channel local port that is ready 718 * 719 * Locking Note: The lport lock is expected to be held before calling 720 * this routine. 721 */ 722 static void fc_lport_enter_ready(struct fc_lport *lport) 723 { 724 FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n", 725 fc_host_port_id(lport->host), fc_lport_state(lport)); 726 727 fc_lport_state_enter(lport, LPORT_ST_READY); 728 729 lport->tt.disc_start(fc_lport_disc_callback, lport); 730 } 731 732 /** 733 * fc_lport_recv_flogi_req() - Receive a FLOGI request 734 * @sp_in: The sequence the FLOGI is on 735 * @rx_fp: The frame the FLOGI is in 736 * @lport: The lport that recieved the request 737 * 738 * A received FLOGI request indicates a point-to-point connection. 739 * Accept it with the common service parameters indicating our N port. 740 * Set up to do a PLOGI if we have the higher-number WWPN. 741 * 742 * Locking Note: The lport lock is exected to be held before calling 743 * this function. 744 */ 745 static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, 746 struct fc_frame *rx_fp, 747 struct fc_lport *lport) 748 { 749 struct fc_frame *fp; 750 struct fc_frame_header *fh; 751 struct fc_seq *sp; 752 struct fc_exch *ep; 753 struct fc_els_flogi *flp; 754 struct fc_els_flogi *new_flp; 755 u64 remote_wwpn; 756 u32 remote_fid; 757 u32 local_fid; 758 u32 f_ctl; 759 760 FC_DEBUG_LPORT("Received FLOGI request while in state %s\n", 761 fc_lport_state(lport)); 762 763 fh = fc_frame_header_get(rx_fp); 764 remote_fid = ntoh24(fh->fh_s_id); 765 flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); 766 if (!flp) 767 goto out; 768 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); 769 if (remote_wwpn == lport->wwpn) { 770 FC_DBG("FLOGI from port with same WWPN %llx " 771 "possible configuration error\n", 772 (unsigned long long)remote_wwpn); 773 goto out; 774 } 775 FC_DBG("FLOGI from port WWPN %llx\n", (unsigned long long)remote_wwpn); 776 777 /* 778 * XXX what is the right thing to do for FIDs? 779 * The originator might expect our S_ID to be 0xfffffe. 780 * But if so, both of us could end up with the same FID. 781 */ 782 local_fid = FC_LOCAL_PTP_FID_LO; 783 if (remote_wwpn < lport->wwpn) { 784 local_fid = FC_LOCAL_PTP_FID_HI; 785 if (!remote_fid || remote_fid == local_fid) 786 remote_fid = FC_LOCAL_PTP_FID_LO; 787 } else if (!remote_fid) { 788 remote_fid = FC_LOCAL_PTP_FID_HI; 789 } 790 791 fc_host_port_id(lport->host) = local_fid; 792 793 fp = fc_frame_alloc(lport, sizeof(*flp)); 794 if (fp) { 795 sp = lport->tt.seq_start_next(fr_seq(rx_fp)); 796 new_flp = fc_frame_payload_get(fp, sizeof(*flp)); 797 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); 798 new_flp->fl_cmd = (u8) ELS_LS_ACC; 799 800 /* 801 * Send the response. If this fails, the originator should 802 * repeat the sequence. 803 */ 804 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; 805 ep = fc_seq_exch(sp); 806 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 807 FC_TYPE_ELS, f_ctl, 0); 808 lport->tt.seq_send(lport, sp, fp); 809 810 } else { 811 fc_lport_error(lport, fp); 812 } 813 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, 814 get_unaligned_be64(&flp->fl_wwnn)); 815 816 lport->tt.disc_start(fc_lport_disc_callback, lport); 817 818 out: 819 sp = fr_seq(rx_fp); 820 fc_frame_free(rx_fp); 821 } 822 823 /** 824 * fc_lport_recv_req() - The generic lport request handler 825 * @lport: The lport that received the request 826 * @sp: The sequence the request is on 827 * @fp: The frame the request is in 828 * 829 * This function will see if the lport handles the request or 830 * if an rport should handle the request. 831 * 832 * Locking Note: This function should not be called with the lport 833 * lock held becuase it will grab the lock. 834 */ 835 static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, 836 struct fc_frame *fp) 837 { 838 struct fc_frame_header *fh = fc_frame_header_get(fp); 839 void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); 840 struct fc_rport *rport; 841 u32 s_id; 842 u32 d_id; 843 struct fc_seq_els_data rjt_data; 844 845 mutex_lock(&lport->lp_mutex); 846 847 /* 848 * Handle special ELS cases like FLOGI, LOGO, and 849 * RSCN here. These don't require a session. 850 * Even if we had a session, it might not be ready. 851 */ 852 if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) { 853 /* 854 * Check opcode. 855 */ 856 recv = NULL; 857 switch (fc_frame_payload_op(fp)) { 858 case ELS_FLOGI: 859 recv = fc_lport_recv_flogi_req; 860 break; 861 case ELS_LOGO: 862 fh = fc_frame_header_get(fp); 863 if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) 864 recv = fc_lport_recv_logo_req; 865 break; 866 case ELS_RSCN: 867 recv = lport->tt.disc_recv_req; 868 break; 869 case ELS_ECHO: 870 recv = fc_lport_recv_echo_req; 871 break; 872 case ELS_RLIR: 873 recv = fc_lport_recv_rlir_req; 874 break; 875 case ELS_RNID: 876 recv = fc_lport_recv_rnid_req; 877 break; 878 case ELS_ADISC: 879 recv = fc_lport_recv_adisc_req; 880 break; 881 } 882 883 if (recv) 884 recv(sp, fp, lport); 885 else { 886 /* 887 * Find session. 888 * If this is a new incoming PLOGI, we won't find it. 889 */ 890 s_id = ntoh24(fh->fh_s_id); 891 d_id = ntoh24(fh->fh_d_id); 892 893 rport = lport->tt.rport_lookup(lport, s_id); 894 if (rport) 895 lport->tt.rport_recv_req(sp, fp, rport); 896 else { 897 rjt_data.fp = NULL; 898 rjt_data.reason = ELS_RJT_UNAB; 899 rjt_data.explan = ELS_EXPL_NONE; 900 lport->tt.seq_els_rsp_send(sp, 901 ELS_LS_RJT, 902 &rjt_data); 903 fc_frame_free(fp); 904 } 905 } 906 } else { 907 FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp)); 908 fc_frame_free(fp); 909 } 910 mutex_unlock(&lport->lp_mutex); 911 912 /* 913 * The common exch_done for all request may not be good 914 * if any request requires longer hold on exhange. XXX 915 */ 916 lport->tt.exch_done(sp); 917 } 918 919 /** 920 * fc_lport_reset() - Reset an lport 921 * @lport: The lport which should be reset 922 * 923 * Locking Note: This functions should not be called with the 924 * lport lock held. 925 */ 926 int fc_lport_reset(struct fc_lport *lport) 927 { 928 cancel_delayed_work_sync(&lport->retry_work); 929 mutex_lock(&lport->lp_mutex); 930 fc_lport_enter_reset(lport); 931 mutex_unlock(&lport->lp_mutex); 932 return 0; 933 } 934 EXPORT_SYMBOL(fc_lport_reset); 935 936 /** 937 * fc_rport_enter_reset() - Reset the local port 938 * @lport: Fibre Channel local port to be reset 939 * 940 * Locking Note: The lport lock is expected to be held before calling 941 * this routine. 942 */ 943 static void fc_lport_enter_reset(struct fc_lport *lport) 944 { 945 FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n", 946 fc_host_port_id(lport->host), fc_lport_state(lport)); 947 948 fc_lport_state_enter(lport, LPORT_ST_RESET); 949 950 if (lport->dns_rp) 951 lport->tt.rport_logoff(lport->dns_rp); 952 953 if (lport->ptp_rp) { 954 lport->tt.rport_logoff(lport->ptp_rp); 955 lport->ptp_rp = NULL; 956 } 957 958 lport->tt.disc_stop(lport); 959 960 lport->tt.exch_mgr_reset(lport, 0, 0); 961 fc_host_fabric_name(lport->host) = 0; 962 fc_host_port_id(lport->host) = 0; 963 964 if (lport->link_up) 965 fc_lport_enter_flogi(lport); 966 } 967 968 /** 969 * fc_lport_error() - Handler for any errors 970 * @lport: The fc_lport object 971 * @fp: The frame pointer 972 * 973 * If the error was caused by a resource allocation failure 974 * then wait for half a second and retry, otherwise retry 975 * after the e_d_tov time. 976 */ 977 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) 978 { 979 unsigned long delay = 0; 980 FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n", 981 PTR_ERR(fp), fc_lport_state(lport), 982 lport->retry_count); 983 984 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 985 /* 986 * Memory allocation failure, or the exchange timed out. 987 * Retry after delay 988 */ 989 if (lport->retry_count < lport->max_retry_count) { 990 lport->retry_count++; 991 if (!fp) 992 delay = msecs_to_jiffies(500); 993 else 994 delay = msecs_to_jiffies(lport->e_d_tov); 995 996 schedule_delayed_work(&lport->retry_work, delay); 997 } else { 998 switch (lport->state) { 999 case LPORT_ST_NONE: 1000 case LPORT_ST_READY: 1001 case LPORT_ST_RESET: 1002 case LPORT_ST_RPN_ID: 1003 case LPORT_ST_RFT_ID: 1004 case LPORT_ST_SCR: 1005 case LPORT_ST_DNS: 1006 case LPORT_ST_FLOGI: 1007 case LPORT_ST_LOGO: 1008 fc_lport_enter_reset(lport); 1009 break; 1010 } 1011 } 1012 } 1013 } 1014 1015 /** 1016 * fc_lport_rft_id_resp() - Handle response to Register Fibre 1017 * Channel Types by ID (RPN_ID) request 1018 * @sp: current sequence in RPN_ID exchange 1019 * @fp: response frame 1020 * @lp_arg: Fibre Channel host port instance 1021 * 1022 * Locking Note: This function will be called without the lport lock 1023 * held, but it will lock, call an _enter_* function or fc_lport_error 1024 * and then unlock the lport. 1025 */ 1026 static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1027 void *lp_arg) 1028 { 1029 struct fc_lport *lport = lp_arg; 1030 struct fc_frame_header *fh; 1031 struct fc_ct_hdr *ct; 1032 1033 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1034 return; 1035 1036 mutex_lock(&lport->lp_mutex); 1037 1038 FC_DEBUG_LPORT("Received a RFT_ID response\n"); 1039 1040 if (lport->state != LPORT_ST_RFT_ID) { 1041 FC_DBG("Received a RFT_ID response, but in state %s\n", 1042 fc_lport_state(lport)); 1043 if (IS_ERR(fp)) 1044 goto err; 1045 goto out; 1046 } 1047 1048 if (IS_ERR(fp)) { 1049 fc_lport_error(lport, fp); 1050 goto err; 1051 } 1052 1053 fh = fc_frame_header_get(fp); 1054 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1055 1056 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1057 ct->ct_fs_type == FC_FST_DIR && 1058 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1059 ntohs(ct->ct_cmd) == FC_FS_ACC) 1060 fc_lport_enter_scr(lport); 1061 else 1062 fc_lport_error(lport, fp); 1063 out: 1064 fc_frame_free(fp); 1065 err: 1066 mutex_unlock(&lport->lp_mutex); 1067 } 1068 1069 /** 1070 * fc_lport_rpn_id_resp() - Handle response to Register Port 1071 * Name by ID (RPN_ID) request 1072 * @sp: current sequence in RPN_ID exchange 1073 * @fp: response frame 1074 * @lp_arg: Fibre Channel host port instance 1075 * 1076 * Locking Note: This function will be called without the lport lock 1077 * held, but it will lock, call an _enter_* function or fc_lport_error 1078 * and then unlock the lport. 1079 */ 1080 static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1081 void *lp_arg) 1082 { 1083 struct fc_lport *lport = lp_arg; 1084 struct fc_frame_header *fh; 1085 struct fc_ct_hdr *ct; 1086 1087 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1088 return; 1089 1090 mutex_lock(&lport->lp_mutex); 1091 1092 FC_DEBUG_LPORT("Received a RPN_ID response\n"); 1093 1094 if (lport->state != LPORT_ST_RPN_ID) { 1095 FC_DBG("Received a RPN_ID response, but in state %s\n", 1096 fc_lport_state(lport)); 1097 if (IS_ERR(fp)) 1098 goto err; 1099 goto out; 1100 } 1101 1102 if (IS_ERR(fp)) { 1103 fc_lport_error(lport, fp); 1104 goto err; 1105 } 1106 1107 fh = fc_frame_header_get(fp); 1108 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1109 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1110 ct->ct_fs_type == FC_FST_DIR && 1111 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1112 ntohs(ct->ct_cmd) == FC_FS_ACC) 1113 fc_lport_enter_rft_id(lport); 1114 else 1115 fc_lport_error(lport, fp); 1116 1117 out: 1118 fc_frame_free(fp); 1119 err: 1120 mutex_unlock(&lport->lp_mutex); 1121 } 1122 1123 /** 1124 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request 1125 * @sp: current sequence in SCR exchange 1126 * @fp: response frame 1127 * @lp_arg: Fibre Channel lport port instance that sent the registration request 1128 * 1129 * Locking Note: This function will be called without the lport lock 1130 * held, but it will lock, call an _enter_* function or fc_lport_error 1131 * and then unlock the lport. 1132 */ 1133 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, 1134 void *lp_arg) 1135 { 1136 struct fc_lport *lport = lp_arg; 1137 u8 op; 1138 1139 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1140 return; 1141 1142 mutex_lock(&lport->lp_mutex); 1143 1144 FC_DEBUG_LPORT("Received a SCR response\n"); 1145 1146 if (lport->state != LPORT_ST_SCR) { 1147 FC_DBG("Received a SCR response, but in state %s\n", 1148 fc_lport_state(lport)); 1149 if (IS_ERR(fp)) 1150 goto err; 1151 goto out; 1152 } 1153 1154 if (IS_ERR(fp)) { 1155 fc_lport_error(lport, fp); 1156 goto err; 1157 } 1158 1159 op = fc_frame_payload_op(fp); 1160 if (op == ELS_LS_ACC) 1161 fc_lport_enter_ready(lport); 1162 else 1163 fc_lport_error(lport, fp); 1164 1165 out: 1166 fc_frame_free(fp); 1167 err: 1168 mutex_unlock(&lport->lp_mutex); 1169 } 1170 1171 /** 1172 * fc_lport_enter_scr() - Send a State Change Register (SCR) request 1173 * @lport: Fibre Channel local port to register for state changes 1174 * 1175 * Locking Note: The lport lock is expected to be held before calling 1176 * this routine. 1177 */ 1178 static void fc_lport_enter_scr(struct fc_lport *lport) 1179 { 1180 struct fc_frame *fp; 1181 1182 FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n", 1183 fc_host_port_id(lport->host), fc_lport_state(lport)); 1184 1185 fc_lport_state_enter(lport, LPORT_ST_SCR); 1186 1187 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); 1188 if (!fp) { 1189 fc_lport_error(lport, fp); 1190 return; 1191 } 1192 1193 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR, 1194 fc_lport_scr_resp, lport, lport->e_d_tov)) 1195 fc_lport_error(lport, fp); 1196 } 1197 1198 /** 1199 * fc_lport_enter_rft_id() - Register FC4-types with the name server 1200 * @lport: Fibre Channel local port to register 1201 * 1202 * Locking Note: The lport lock is expected to be held before calling 1203 * this routine. 1204 */ 1205 static void fc_lport_enter_rft_id(struct fc_lport *lport) 1206 { 1207 struct fc_frame *fp; 1208 struct fc_ns_fts *lps; 1209 int i; 1210 1211 FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n", 1212 fc_host_port_id(lport->host), fc_lport_state(lport)); 1213 1214 fc_lport_state_enter(lport, LPORT_ST_RFT_ID); 1215 1216 lps = &lport->fcts; 1217 i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); 1218 while (--i >= 0) 1219 if (ntohl(lps->ff_type_map[i]) != 0) 1220 break; 1221 if (i < 0) { 1222 /* nothing to register, move on to SCR */ 1223 fc_lport_enter_scr(lport); 1224 return; 1225 } 1226 1227 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1228 sizeof(struct fc_ns_rft)); 1229 if (!fp) { 1230 fc_lport_error(lport, fp); 1231 return; 1232 } 1233 1234 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID, 1235 fc_lport_rft_id_resp, 1236 lport, lport->e_d_tov)) 1237 fc_lport_error(lport, fp); 1238 } 1239 1240 /** 1241 * fc_rport_enter_rft_id() - Register port name with the name server 1242 * @lport: Fibre Channel local port to register 1243 * 1244 * Locking Note: The lport lock is expected to be held before calling 1245 * this routine. 1246 */ 1247 static void fc_lport_enter_rpn_id(struct fc_lport *lport) 1248 { 1249 struct fc_frame *fp; 1250 1251 FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n", 1252 fc_host_port_id(lport->host), fc_lport_state(lport)); 1253 1254 fc_lport_state_enter(lport, LPORT_ST_RPN_ID); 1255 1256 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1257 sizeof(struct fc_ns_rn_id)); 1258 if (!fp) { 1259 fc_lport_error(lport, fp); 1260 return; 1261 } 1262 1263 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID, 1264 fc_lport_rpn_id_resp, 1265 lport, lport->e_d_tov)) 1266 fc_lport_error(lport, fp); 1267 } 1268 1269 static struct fc_rport_operations fc_lport_rport_ops = { 1270 .event_callback = fc_lport_rport_callback, 1271 }; 1272 1273 /** 1274 * fc_rport_enter_dns() - Create a rport to the name server 1275 * @lport: Fibre Channel local port requesting a rport for the name server 1276 * 1277 * Locking Note: The lport lock is expected to be held before calling 1278 * this routine. 1279 */ 1280 static void fc_lport_enter_dns(struct fc_lport *lport) 1281 { 1282 struct fc_rport *rport; 1283 struct fc_rport_libfc_priv *rdata; 1284 struct fc_disc_port dp; 1285 1286 dp.ids.port_id = FC_FID_DIR_SERV; 1287 dp.ids.port_name = -1; 1288 dp.ids.node_name = -1; 1289 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; 1290 dp.lp = lport; 1291 1292 FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n", 1293 fc_host_port_id(lport->host), fc_lport_state(lport)); 1294 1295 fc_lport_state_enter(lport, LPORT_ST_DNS); 1296 1297 rport = lport->tt.rport_create(&dp); 1298 if (!rport) 1299 goto err; 1300 1301 rdata = rport->dd_data; 1302 rdata->ops = &fc_lport_rport_ops; 1303 lport->tt.rport_login(rport); 1304 return; 1305 1306 err: 1307 fc_lport_error(lport, NULL); 1308 } 1309 1310 /** 1311 * fc_lport_timeout() - Handler for the retry_work timer. 1312 * @work: The work struct of the fc_lport 1313 */ 1314 static void fc_lport_timeout(struct work_struct *work) 1315 { 1316 struct fc_lport *lport = 1317 container_of(work, struct fc_lport, 1318 retry_work.work); 1319 1320 mutex_lock(&lport->lp_mutex); 1321 1322 switch (lport->state) { 1323 case LPORT_ST_NONE: 1324 case LPORT_ST_READY: 1325 case LPORT_ST_RESET: 1326 WARN_ON(1); 1327 break; 1328 case LPORT_ST_FLOGI: 1329 fc_lport_enter_flogi(lport); 1330 break; 1331 case LPORT_ST_DNS: 1332 fc_lport_enter_dns(lport); 1333 break; 1334 case LPORT_ST_RPN_ID: 1335 fc_lport_enter_rpn_id(lport); 1336 break; 1337 case LPORT_ST_RFT_ID: 1338 fc_lport_enter_rft_id(lport); 1339 break; 1340 case LPORT_ST_SCR: 1341 fc_lport_enter_scr(lport); 1342 break; 1343 case LPORT_ST_LOGO: 1344 fc_lport_enter_logo(lport); 1345 break; 1346 } 1347 1348 mutex_unlock(&lport->lp_mutex); 1349 } 1350 1351 /** 1352 * fc_lport_logo_resp() - Handle response to LOGO request 1353 * @sp: current sequence in LOGO exchange 1354 * @fp: response frame 1355 * @lp_arg: Fibre Channel lport port instance that sent the LOGO request 1356 * 1357 * Locking Note: This function will be called without the lport lock 1358 * held, but it will lock, call an _enter_* function or fc_lport_error 1359 * and then unlock the lport. 1360 */ 1361 static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1362 void *lp_arg) 1363 { 1364 struct fc_lport *lport = lp_arg; 1365 u8 op; 1366 1367 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1368 return; 1369 1370 mutex_lock(&lport->lp_mutex); 1371 1372 FC_DEBUG_LPORT("Received a LOGO response\n"); 1373 1374 if (lport->state != LPORT_ST_LOGO) { 1375 FC_DBG("Received a LOGO response, but in state %s\n", 1376 fc_lport_state(lport)); 1377 if (IS_ERR(fp)) 1378 goto err; 1379 goto out; 1380 } 1381 1382 if (IS_ERR(fp)) { 1383 fc_lport_error(lport, fp); 1384 goto err; 1385 } 1386 1387 op = fc_frame_payload_op(fp); 1388 if (op == ELS_LS_ACC) 1389 fc_lport_enter_reset(lport); 1390 else 1391 fc_lport_error(lport, fp); 1392 1393 out: 1394 fc_frame_free(fp); 1395 err: 1396 mutex_unlock(&lport->lp_mutex); 1397 } 1398 1399 /** 1400 * fc_rport_enter_logo() - Logout of the fabric 1401 * @lport: Fibre Channel local port to be logged out 1402 * 1403 * Locking Note: The lport lock is expected to be held before calling 1404 * this routine. 1405 */ 1406 static void fc_lport_enter_logo(struct fc_lport *lport) 1407 { 1408 struct fc_frame *fp; 1409 struct fc_els_logo *logo; 1410 1411 FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n", 1412 fc_host_port_id(lport->host), fc_lport_state(lport)); 1413 1414 fc_lport_state_enter(lport, LPORT_ST_LOGO); 1415 1416 fp = fc_frame_alloc(lport, sizeof(*logo)); 1417 if (!fp) { 1418 fc_lport_error(lport, fp); 1419 return; 1420 } 1421 1422 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp, 1423 lport, lport->e_d_tov)) 1424 fc_lport_error(lport, fp); 1425 } 1426 1427 /** 1428 * fc_lport_flogi_resp() - Handle response to FLOGI request 1429 * @sp: current sequence in FLOGI exchange 1430 * @fp: response frame 1431 * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request 1432 * 1433 * Locking Note: This function will be called without the lport lock 1434 * held, but it will lock, call an _enter_* function or fc_lport_error 1435 * and then unlock the lport. 1436 */ 1437 static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 1438 void *lp_arg) 1439 { 1440 struct fc_lport *lport = lp_arg; 1441 struct fc_frame_header *fh; 1442 struct fc_els_flogi *flp; 1443 u32 did; 1444 u16 csp_flags; 1445 unsigned int r_a_tov; 1446 unsigned int e_d_tov; 1447 u16 mfs; 1448 1449 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1450 return; 1451 1452 mutex_lock(&lport->lp_mutex); 1453 1454 FC_DEBUG_LPORT("Received a FLOGI response\n"); 1455 1456 if (lport->state != LPORT_ST_FLOGI) { 1457 FC_DBG("Received a FLOGI response, but in state %s\n", 1458 fc_lport_state(lport)); 1459 if (IS_ERR(fp)) 1460 goto err; 1461 goto out; 1462 } 1463 1464 if (IS_ERR(fp)) { 1465 fc_lport_error(lport, fp); 1466 goto err; 1467 } 1468 1469 fh = fc_frame_header_get(fp); 1470 did = ntoh24(fh->fh_d_id); 1471 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { 1472 1473 FC_DEBUG_LPORT("Assigned fid %x\n", did); 1474 fc_host_port_id(lport->host) = did; 1475 1476 flp = fc_frame_payload_get(fp, sizeof(*flp)); 1477 if (flp) { 1478 mfs = ntohs(flp->fl_csp.sp_bb_data) & 1479 FC_SP_BB_DATA_MASK; 1480 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && 1481 mfs < lport->mfs) 1482 lport->mfs = mfs; 1483 csp_flags = ntohs(flp->fl_csp.sp_features); 1484 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); 1485 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); 1486 if (csp_flags & FC_SP_FT_EDTR) 1487 e_d_tov /= 1000000; 1488 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1489 if (e_d_tov > lport->e_d_tov) 1490 lport->e_d_tov = e_d_tov; 1491 lport->r_a_tov = 2 * e_d_tov; 1492 FC_DBG("Point-to-Point mode\n"); 1493 fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), 1494 get_unaligned_be64( 1495 &flp->fl_wwpn), 1496 get_unaligned_be64( 1497 &flp->fl_wwnn)); 1498 } else { 1499 lport->e_d_tov = e_d_tov; 1500 lport->r_a_tov = r_a_tov; 1501 fc_host_fabric_name(lport->host) = 1502 get_unaligned_be64(&flp->fl_wwnn); 1503 fc_lport_enter_dns(lport); 1504 } 1505 } 1506 1507 if (flp) { 1508 csp_flags = ntohs(flp->fl_csp.sp_features); 1509 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1510 lport->tt.disc_start(fc_lport_disc_callback, 1511 lport); 1512 } 1513 } 1514 } else { 1515 FC_DBG("bad FLOGI response\n"); 1516 } 1517 1518 out: 1519 fc_frame_free(fp); 1520 err: 1521 mutex_unlock(&lport->lp_mutex); 1522 } 1523 1524 /** 1525 * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager 1526 * @lport: Fibre Channel local port to be logged in to the fabric 1527 * 1528 * Locking Note: The lport lock is expected to be held before calling 1529 * this routine. 1530 */ 1531 void fc_lport_enter_flogi(struct fc_lport *lport) 1532 { 1533 struct fc_frame *fp; 1534 1535 FC_DEBUG_LPORT("Processing FLOGI state\n"); 1536 1537 fc_lport_state_enter(lport, LPORT_ST_FLOGI); 1538 1539 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 1540 if (!fp) 1541 return fc_lport_error(lport, fp); 1542 1543 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI, 1544 fc_lport_flogi_resp, lport, lport->e_d_tov)) 1545 fc_lport_error(lport, fp); 1546 } 1547 1548 /* Configure a fc_lport */ 1549 int fc_lport_config(struct fc_lport *lport) 1550 { 1551 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); 1552 mutex_init(&lport->lp_mutex); 1553 1554 fc_lport_state_enter(lport, LPORT_ST_NONE); 1555 1556 fc_lport_add_fc4_type(lport, FC_TYPE_FCP); 1557 fc_lport_add_fc4_type(lport, FC_TYPE_CT); 1558 1559 return 0; 1560 } 1561 EXPORT_SYMBOL(fc_lport_config); 1562 1563 int fc_lport_init(struct fc_lport *lport) 1564 { 1565 if (!lport->tt.lport_recv) 1566 lport->tt.lport_recv = fc_lport_recv_req; 1567 1568 if (!lport->tt.lport_reset) 1569 lport->tt.lport_reset = fc_lport_reset; 1570 1571 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; 1572 fc_host_node_name(lport->host) = lport->wwnn; 1573 fc_host_port_name(lport->host) = lport->wwpn; 1574 fc_host_supported_classes(lport->host) = FC_COS_CLASS3; 1575 memset(fc_host_supported_fc4s(lport->host), 0, 1576 sizeof(fc_host_supported_fc4s(lport->host))); 1577 fc_host_supported_fc4s(lport->host)[2] = 1; 1578 fc_host_supported_fc4s(lport->host)[7] = 1; 1579 1580 /* This value is also unchanging */ 1581 memset(fc_host_active_fc4s(lport->host), 0, 1582 sizeof(fc_host_active_fc4s(lport->host))); 1583 fc_host_active_fc4s(lport->host)[2] = 1; 1584 fc_host_active_fc4s(lport->host)[7] = 1; 1585 fc_host_maxframe_size(lport->host) = lport->mfs; 1586 fc_host_supported_speeds(lport->host) = 0; 1587 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) 1588 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; 1589 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) 1590 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; 1591 1592 return 0; 1593 } 1594 EXPORT_SYMBOL(fc_lport_init); 1595