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 = fc_rport_rogue_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_status & FC_LINK_UP) == FC_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_status & FC_LINK_UP) != FC_LINK_UP) { 581 lport->link_status |= FC_LINK_UP; 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_status & FC_LINK_UP) == FC_LINK_UP) { 601 lport->link_status &= ~(FC_LINK_UP); 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_pause - Pause the flow of frames 611 * @lport: The lport to be paused 612 */ 613 void fc_pause(struct fc_lport *lport) 614 { 615 mutex_lock(&lport->lp_mutex); 616 lport->link_status |= FC_PAUSE; 617 mutex_unlock(&lport->lp_mutex); 618 } 619 EXPORT_SYMBOL(fc_pause); 620 621 /** 622 * fc_unpause - Unpause the flow of frames 623 * @lport: The lport to be unpaused 624 */ 625 void fc_unpause(struct fc_lport *lport) 626 { 627 mutex_lock(&lport->lp_mutex); 628 lport->link_status &= ~(FC_PAUSE); 629 mutex_unlock(&lport->lp_mutex); 630 } 631 EXPORT_SYMBOL(fc_unpause); 632 633 /** 634 * fc_fabric_logoff - Logout of the fabric 635 * @lport: fc_lport pointer to logoff the fabric 636 * 637 * Return value: 638 * 0 for success, -1 for failure 639 **/ 640 int fc_fabric_logoff(struct fc_lport *lport) 641 { 642 lport->tt.disc_stop_final(lport); 643 mutex_lock(&lport->lp_mutex); 644 fc_lport_enter_logo(lport); 645 mutex_unlock(&lport->lp_mutex); 646 return 0; 647 } 648 EXPORT_SYMBOL(fc_fabric_logoff); 649 650 /** 651 * fc_lport_destroy - unregister a fc_lport 652 * @lport: fc_lport pointer to unregister 653 * 654 * Return value: 655 * None 656 * Note: 657 * exit routine for fc_lport instance 658 * clean-up all the allocated memory 659 * and free up other system resources. 660 * 661 **/ 662 int fc_lport_destroy(struct fc_lport *lport) 663 { 664 lport->tt.frame_send = fc_frame_drop; 665 lport->tt.fcp_abort_io(lport); 666 lport->tt.exch_mgr_reset(lport->emp, 0, 0); 667 return 0; 668 } 669 EXPORT_SYMBOL(fc_lport_destroy); 670 671 /** 672 * fc_set_mfs - sets up the mfs for the corresponding fc_lport 673 * @lport: fc_lport pointer to unregister 674 * @mfs: the new mfs for fc_lport 675 * 676 * Set mfs for the given fc_lport to the new mfs. 677 * 678 * Return: 0 for success 679 * 680 **/ 681 int fc_set_mfs(struct fc_lport *lport, u32 mfs) 682 { 683 unsigned int old_mfs; 684 int rc = -EINVAL; 685 686 mutex_lock(&lport->lp_mutex); 687 688 old_mfs = lport->mfs; 689 690 if (mfs >= FC_MIN_MAX_FRAME) { 691 mfs &= ~3; 692 if (mfs > FC_MAX_FRAME) 693 mfs = FC_MAX_FRAME; 694 mfs -= sizeof(struct fc_frame_header); 695 lport->mfs = mfs; 696 rc = 0; 697 } 698 699 if (!rc && mfs < old_mfs) 700 fc_lport_enter_reset(lport); 701 702 mutex_unlock(&lport->lp_mutex); 703 704 return rc; 705 } 706 EXPORT_SYMBOL(fc_set_mfs); 707 708 /** 709 * fc_lport_disc_callback - Callback for discovery events 710 * @lport: FC local port 711 * @event: The discovery event 712 */ 713 void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) 714 { 715 switch (event) { 716 case DISC_EV_SUCCESS: 717 FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n", 718 fc_host_port_id(lport->host)); 719 break; 720 case DISC_EV_FAILED: 721 FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n", 722 fc_host_port_id(lport->host)); 723 mutex_lock(&lport->lp_mutex); 724 fc_lport_enter_reset(lport); 725 mutex_unlock(&lport->lp_mutex); 726 break; 727 case DISC_EV_NONE: 728 WARN_ON(1); 729 break; 730 } 731 } 732 733 /** 734 * fc_rport_enter_ready - Enter the ready state and start discovery 735 * @lport: Fibre Channel local port that is ready 736 * 737 * Locking Note: The lport lock is expected to be held before calling 738 * this routine. 739 */ 740 static void fc_lport_enter_ready(struct fc_lport *lport) 741 { 742 FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n", 743 fc_host_port_id(lport->host), fc_lport_state(lport)); 744 745 fc_lport_state_enter(lport, LPORT_ST_READY); 746 747 lport->tt.disc_start(fc_lport_disc_callback, lport); 748 } 749 750 /** 751 * fc_lport_recv_flogi_req - Receive a FLOGI request 752 * @sp_in: The sequence the FLOGI is on 753 * @rx_fp: The frame the FLOGI is in 754 * @lport: The lport that recieved the request 755 * 756 * A received FLOGI request indicates a point-to-point connection. 757 * Accept it with the common service parameters indicating our N port. 758 * Set up to do a PLOGI if we have the higher-number WWPN. 759 * 760 * Locking Note: The lport lock is exected to be held before calling 761 * this function. 762 */ 763 static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, 764 struct fc_frame *rx_fp, 765 struct fc_lport *lport) 766 { 767 struct fc_frame *fp; 768 struct fc_frame_header *fh; 769 struct fc_seq *sp; 770 struct fc_exch *ep; 771 struct fc_els_flogi *flp; 772 struct fc_els_flogi *new_flp; 773 u64 remote_wwpn; 774 u32 remote_fid; 775 u32 local_fid; 776 u32 f_ctl; 777 778 FC_DEBUG_LPORT("Received FLOGI request while in state %s\n", 779 fc_lport_state(lport)); 780 781 fh = fc_frame_header_get(rx_fp); 782 remote_fid = ntoh24(fh->fh_s_id); 783 flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); 784 if (!flp) 785 goto out; 786 remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); 787 if (remote_wwpn == lport->wwpn) { 788 FC_DBG("FLOGI from port with same WWPN %llx " 789 "possible configuration error\n", remote_wwpn); 790 goto out; 791 } 792 FC_DBG("FLOGI from port WWPN %llx\n", remote_wwpn); 793 794 /* 795 * XXX what is the right thing to do for FIDs? 796 * The originator might expect our S_ID to be 0xfffffe. 797 * But if so, both of us could end up with the same FID. 798 */ 799 local_fid = FC_LOCAL_PTP_FID_LO; 800 if (remote_wwpn < lport->wwpn) { 801 local_fid = FC_LOCAL_PTP_FID_HI; 802 if (!remote_fid || remote_fid == local_fid) 803 remote_fid = FC_LOCAL_PTP_FID_LO; 804 } else if (!remote_fid) { 805 remote_fid = FC_LOCAL_PTP_FID_HI; 806 } 807 808 fc_host_port_id(lport->host) = local_fid; 809 810 fp = fc_frame_alloc(lport, sizeof(*flp)); 811 if (fp) { 812 sp = lport->tt.seq_start_next(fr_seq(rx_fp)); 813 new_flp = fc_frame_payload_get(fp, sizeof(*flp)); 814 fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); 815 new_flp->fl_cmd = (u8) ELS_LS_ACC; 816 817 /* 818 * Send the response. If this fails, the originator should 819 * repeat the sequence. 820 */ 821 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; 822 ep = fc_seq_exch(sp); 823 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, 824 FC_TYPE_ELS, f_ctl, 0); 825 lport->tt.seq_send(lport, sp, fp); 826 827 } else { 828 fc_lport_error(lport, fp); 829 } 830 fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, 831 get_unaligned_be64(&flp->fl_wwnn)); 832 833 lport->tt.disc_start(fc_lport_disc_callback, lport); 834 835 out: 836 sp = fr_seq(rx_fp); 837 fc_frame_free(rx_fp); 838 } 839 840 /** 841 * fc_lport_recv_req - The generic lport request handler 842 * @lport: The lport that received the request 843 * @sp: The sequence the request is on 844 * @fp: The frame the request is in 845 * 846 * This function will see if the lport handles the request or 847 * if an rport should handle the request. 848 * 849 * Locking Note: This function should not be called with the lport 850 * lock held becuase it will grab the lock. 851 */ 852 static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, 853 struct fc_frame *fp) 854 { 855 struct fc_frame_header *fh = fc_frame_header_get(fp); 856 void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); 857 struct fc_rport *rport; 858 u32 s_id; 859 u32 d_id; 860 struct fc_seq_els_data rjt_data; 861 862 mutex_lock(&lport->lp_mutex); 863 864 /* 865 * Handle special ELS cases like FLOGI, LOGO, and 866 * RSCN here. These don't require a session. 867 * Even if we had a session, it might not be ready. 868 */ 869 if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) { 870 /* 871 * Check opcode. 872 */ 873 recv = NULL; 874 switch (fc_frame_payload_op(fp)) { 875 case ELS_FLOGI: 876 recv = fc_lport_recv_flogi_req; 877 break; 878 case ELS_LOGO: 879 fh = fc_frame_header_get(fp); 880 if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) 881 recv = fc_lport_recv_logo_req; 882 break; 883 case ELS_RSCN: 884 recv = lport->tt.disc_recv_req; 885 break; 886 case ELS_ECHO: 887 recv = fc_lport_recv_echo_req; 888 break; 889 case ELS_RLIR: 890 recv = fc_lport_recv_rlir_req; 891 break; 892 case ELS_RNID: 893 recv = fc_lport_recv_rnid_req; 894 break; 895 case ELS_ADISC: 896 recv = fc_lport_recv_adisc_req; 897 break; 898 } 899 900 if (recv) 901 recv(sp, fp, lport); 902 else { 903 /* 904 * Find session. 905 * If this is a new incoming PLOGI, we won't find it. 906 */ 907 s_id = ntoh24(fh->fh_s_id); 908 d_id = ntoh24(fh->fh_d_id); 909 910 rport = lport->tt.rport_lookup(lport, s_id); 911 if (rport) 912 lport->tt.rport_recv_req(sp, fp, rport); 913 else { 914 rjt_data.fp = NULL; 915 rjt_data.reason = ELS_RJT_UNAB; 916 rjt_data.explan = ELS_EXPL_NONE; 917 lport->tt.seq_els_rsp_send(sp, 918 ELS_LS_RJT, 919 &rjt_data); 920 fc_frame_free(fp); 921 } 922 } 923 } else { 924 FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp)); 925 fc_frame_free(fp); 926 } 927 mutex_unlock(&lport->lp_mutex); 928 929 /* 930 * The common exch_done for all request may not be good 931 * if any request requires longer hold on exhange. XXX 932 */ 933 lport->tt.exch_done(sp); 934 } 935 936 /** 937 * fc_lport_reset - Reset an lport 938 * @lport: The lport which should be reset 939 * 940 * Locking Note: This functions should not be called with the 941 * lport lock held. 942 */ 943 int fc_lport_reset(struct fc_lport *lport) 944 { 945 mutex_lock(&lport->lp_mutex); 946 fc_lport_enter_reset(lport); 947 mutex_unlock(&lport->lp_mutex); 948 return 0; 949 } 950 EXPORT_SYMBOL(fc_lport_reset); 951 952 /** 953 * fc_rport_enter_reset - Reset the local port 954 * @lport: Fibre Channel local port to be reset 955 * 956 * Locking Note: The lport lock is expected to be held before calling 957 * this routine. 958 */ 959 static void fc_lport_enter_reset(struct fc_lport *lport) 960 { 961 FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n", 962 fc_host_port_id(lport->host), fc_lport_state(lport)); 963 964 fc_lport_state_enter(lport, LPORT_ST_RESET); 965 966 if (lport->dns_rp) 967 lport->tt.rport_logoff(lport->dns_rp); 968 969 if (lport->ptp_rp) { 970 lport->tt.rport_logoff(lport->ptp_rp); 971 lport->ptp_rp = NULL; 972 } 973 974 lport->tt.disc_stop(lport); 975 976 lport->tt.exch_mgr_reset(lport->emp, 0, 0); 977 fc_host_fabric_name(lport->host) = 0; 978 fc_host_port_id(lport->host) = 0; 979 980 if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP) 981 fc_lport_enter_flogi(lport); 982 } 983 984 /** 985 * fc_lport_error - Handler for any errors 986 * @lport: The fc_lport object 987 * @fp: The frame pointer 988 * 989 * If the error was caused by a resource allocation failure 990 * then wait for half a second and retry, otherwise retry 991 * after the e_d_tov time. 992 */ 993 static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) 994 { 995 unsigned long delay = 0; 996 FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n", 997 PTR_ERR(fp), fc_lport_state(lport), 998 lport->retry_count); 999 1000 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 1001 /* 1002 * Memory allocation failure, or the exchange timed out. 1003 * Retry after delay 1004 */ 1005 if (lport->retry_count < lport->max_retry_count) { 1006 lport->retry_count++; 1007 if (!fp) 1008 delay = msecs_to_jiffies(500); 1009 else 1010 delay = msecs_to_jiffies(lport->e_d_tov); 1011 1012 schedule_delayed_work(&lport->retry_work, delay); 1013 } else { 1014 switch (lport->state) { 1015 case LPORT_ST_NONE: 1016 case LPORT_ST_READY: 1017 case LPORT_ST_RESET: 1018 case LPORT_ST_RPN_ID: 1019 case LPORT_ST_RFT_ID: 1020 case LPORT_ST_SCR: 1021 case LPORT_ST_DNS: 1022 case LPORT_ST_FLOGI: 1023 case LPORT_ST_LOGO: 1024 fc_lport_enter_reset(lport); 1025 break; 1026 } 1027 } 1028 } 1029 } 1030 1031 /** 1032 * fc_lport_rft_id_resp - Handle response to Register Fibre 1033 * Channel Types by ID (RPN_ID) request 1034 * @sp: current sequence in RPN_ID exchange 1035 * @fp: response frame 1036 * @lp_arg: Fibre Channel host port instance 1037 * 1038 * Locking Note: This function will be called without the lport lock 1039 * held, but it will lock, call an _enter_* function or fc_lport_error 1040 * and then unlock the lport. 1041 */ 1042 static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1043 void *lp_arg) 1044 { 1045 struct fc_lport *lport = lp_arg; 1046 struct fc_frame_header *fh; 1047 struct fc_ct_hdr *ct; 1048 1049 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1050 return; 1051 1052 mutex_lock(&lport->lp_mutex); 1053 1054 FC_DEBUG_LPORT("Received a RFT_ID response\n"); 1055 1056 if (lport->state != LPORT_ST_RFT_ID) { 1057 FC_DBG("Received a RFT_ID response, but in state %s\n", 1058 fc_lport_state(lport)); 1059 goto out; 1060 } 1061 1062 if (IS_ERR(fp)) { 1063 fc_lport_error(lport, fp); 1064 goto err; 1065 } 1066 1067 fh = fc_frame_header_get(fp); 1068 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1069 1070 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1071 ct->ct_fs_type == FC_FST_DIR && 1072 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1073 ntohs(ct->ct_cmd) == FC_FS_ACC) 1074 fc_lport_enter_scr(lport); 1075 else 1076 fc_lport_error(lport, fp); 1077 out: 1078 fc_frame_free(fp); 1079 err: 1080 mutex_unlock(&lport->lp_mutex); 1081 } 1082 1083 /** 1084 * fc_lport_rpn_id_resp - Handle response to Register Port 1085 * Name by ID (RPN_ID) request 1086 * @sp: current sequence in RPN_ID exchange 1087 * @fp: response frame 1088 * @lp_arg: Fibre Channel host port instance 1089 * 1090 * Locking Note: This function will be called without the lport lock 1091 * held, but it will lock, call an _enter_* function or fc_lport_error 1092 * and then unlock the lport. 1093 */ 1094 static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 1095 void *lp_arg) 1096 { 1097 struct fc_lport *lport = lp_arg; 1098 struct fc_frame_header *fh; 1099 struct fc_ct_hdr *ct; 1100 1101 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1102 return; 1103 1104 mutex_lock(&lport->lp_mutex); 1105 1106 FC_DEBUG_LPORT("Received a RPN_ID response\n"); 1107 1108 if (lport->state != LPORT_ST_RPN_ID) { 1109 FC_DBG("Received a RPN_ID response, but in state %s\n", 1110 fc_lport_state(lport)); 1111 goto out; 1112 } 1113 1114 if (IS_ERR(fp)) { 1115 fc_lport_error(lport, fp); 1116 goto err; 1117 } 1118 1119 fh = fc_frame_header_get(fp); 1120 ct = fc_frame_payload_get(fp, sizeof(*ct)); 1121 if (fh && ct && fh->fh_type == FC_TYPE_CT && 1122 ct->ct_fs_type == FC_FST_DIR && 1123 ct->ct_fs_subtype == FC_NS_SUBTYPE && 1124 ntohs(ct->ct_cmd) == FC_FS_ACC) 1125 fc_lport_enter_rft_id(lport); 1126 else 1127 fc_lport_error(lport, fp); 1128 1129 out: 1130 fc_frame_free(fp); 1131 err: 1132 mutex_unlock(&lport->lp_mutex); 1133 } 1134 1135 /** 1136 * fc_lport_scr_resp - Handle response to State Change Register (SCR) request 1137 * @sp: current sequence in SCR exchange 1138 * @fp: response frame 1139 * @lp_arg: Fibre Channel lport port instance that sent the registration request 1140 * 1141 * Locking Note: This function will be called without the lport lock 1142 * held, but it will lock, call an _enter_* function or fc_lport_error 1143 * and then unlock the lport. 1144 */ 1145 static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, 1146 void *lp_arg) 1147 { 1148 struct fc_lport *lport = lp_arg; 1149 u8 op; 1150 1151 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1152 return; 1153 1154 mutex_lock(&lport->lp_mutex); 1155 1156 FC_DEBUG_LPORT("Received a SCR response\n"); 1157 1158 if (lport->state != LPORT_ST_SCR) { 1159 FC_DBG("Received a SCR response, but in state %s\n", 1160 fc_lport_state(lport)); 1161 goto out; 1162 } 1163 1164 if (IS_ERR(fp)) { 1165 fc_lport_error(lport, fp); 1166 goto err; 1167 } 1168 1169 op = fc_frame_payload_op(fp); 1170 if (op == ELS_LS_ACC) 1171 fc_lport_enter_ready(lport); 1172 else 1173 fc_lport_error(lport, fp); 1174 1175 out: 1176 fc_frame_free(fp); 1177 err: 1178 mutex_unlock(&lport->lp_mutex); 1179 } 1180 1181 /** 1182 * fc_lport_enter_scr - Send a State Change Register (SCR) request 1183 * @lport: Fibre Channel local port to register for state changes 1184 * 1185 * Locking Note: The lport lock is expected to be held before calling 1186 * this routine. 1187 */ 1188 static void fc_lport_enter_scr(struct fc_lport *lport) 1189 { 1190 struct fc_frame *fp; 1191 1192 FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n", 1193 fc_host_port_id(lport->host), fc_lport_state(lport)); 1194 1195 fc_lport_state_enter(lport, LPORT_ST_SCR); 1196 1197 fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); 1198 if (!fp) { 1199 fc_lport_error(lport, fp); 1200 return; 1201 } 1202 1203 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR, 1204 fc_lport_scr_resp, lport, lport->e_d_tov)) 1205 fc_lport_error(lport, fp); 1206 } 1207 1208 /** 1209 * fc_lport_enter_rft_id - Register FC4-types with the name server 1210 * @lport: Fibre Channel local port to register 1211 * 1212 * Locking Note: The lport lock is expected to be held before calling 1213 * this routine. 1214 */ 1215 static void fc_lport_enter_rft_id(struct fc_lport *lport) 1216 { 1217 struct fc_frame *fp; 1218 struct fc_ns_fts *lps; 1219 int i; 1220 1221 FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n", 1222 fc_host_port_id(lport->host), fc_lport_state(lport)); 1223 1224 fc_lport_state_enter(lport, LPORT_ST_RFT_ID); 1225 1226 lps = &lport->fcts; 1227 i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); 1228 while (--i >= 0) 1229 if (ntohl(lps->ff_type_map[i]) != 0) 1230 break; 1231 if (i < 0) { 1232 /* nothing to register, move on to SCR */ 1233 fc_lport_enter_scr(lport); 1234 return; 1235 } 1236 1237 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1238 sizeof(struct fc_ns_rft)); 1239 if (!fp) { 1240 fc_lport_error(lport, fp); 1241 return; 1242 } 1243 1244 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID, 1245 fc_lport_rft_id_resp, 1246 lport, lport->e_d_tov)) 1247 fc_lport_error(lport, fp); 1248 } 1249 1250 /** 1251 * fc_rport_enter_rft_id - Register port name with the name server 1252 * @lport: Fibre Channel local port to register 1253 * 1254 * Locking Note: The lport lock is expected to be held before calling 1255 * this routine. 1256 */ 1257 static void fc_lport_enter_rpn_id(struct fc_lport *lport) 1258 { 1259 struct fc_frame *fp; 1260 1261 FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n", 1262 fc_host_port_id(lport->host), fc_lport_state(lport)); 1263 1264 fc_lport_state_enter(lport, LPORT_ST_RPN_ID); 1265 1266 fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 1267 sizeof(struct fc_ns_rn_id)); 1268 if (!fp) { 1269 fc_lport_error(lport, fp); 1270 return; 1271 } 1272 1273 if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID, 1274 fc_lport_rpn_id_resp, 1275 lport, lport->e_d_tov)) 1276 fc_lport_error(lport, fp); 1277 } 1278 1279 static struct fc_rport_operations fc_lport_rport_ops = { 1280 .event_callback = fc_lport_rport_callback, 1281 }; 1282 1283 /** 1284 * fc_rport_enter_dns - Create a rport to the name server 1285 * @lport: Fibre Channel local port requesting a rport for the name server 1286 * 1287 * Locking Note: The lport lock is expected to be held before calling 1288 * this routine. 1289 */ 1290 static void fc_lport_enter_dns(struct fc_lport *lport) 1291 { 1292 struct fc_rport *rport; 1293 struct fc_rport_libfc_priv *rdata; 1294 struct fc_disc_port dp; 1295 1296 dp.ids.port_id = FC_FID_DIR_SERV; 1297 dp.ids.port_name = -1; 1298 dp.ids.node_name = -1; 1299 dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; 1300 dp.lp = lport; 1301 1302 FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n", 1303 fc_host_port_id(lport->host), fc_lport_state(lport)); 1304 1305 fc_lport_state_enter(lport, LPORT_ST_DNS); 1306 1307 rport = fc_rport_rogue_create(&dp); 1308 if (!rport) 1309 goto err; 1310 1311 rdata = rport->dd_data; 1312 rdata->ops = &fc_lport_rport_ops; 1313 lport->tt.rport_login(rport); 1314 return; 1315 1316 err: 1317 fc_lport_error(lport, NULL); 1318 } 1319 1320 /** 1321 * fc_lport_timeout - Handler for the retry_work timer. 1322 * @work: The work struct of the fc_lport 1323 */ 1324 static void fc_lport_timeout(struct work_struct *work) 1325 { 1326 struct fc_lport *lport = 1327 container_of(work, struct fc_lport, 1328 retry_work.work); 1329 1330 mutex_lock(&lport->lp_mutex); 1331 1332 switch (lport->state) { 1333 case LPORT_ST_NONE: 1334 case LPORT_ST_READY: 1335 case LPORT_ST_RESET: 1336 WARN_ON(1); 1337 break; 1338 case LPORT_ST_FLOGI: 1339 fc_lport_enter_flogi(lport); 1340 break; 1341 case LPORT_ST_DNS: 1342 fc_lport_enter_dns(lport); 1343 break; 1344 case LPORT_ST_RPN_ID: 1345 fc_lport_enter_rpn_id(lport); 1346 break; 1347 case LPORT_ST_RFT_ID: 1348 fc_lport_enter_rft_id(lport); 1349 break; 1350 case LPORT_ST_SCR: 1351 fc_lport_enter_scr(lport); 1352 break; 1353 case LPORT_ST_LOGO: 1354 fc_lport_enter_logo(lport); 1355 break; 1356 } 1357 1358 mutex_unlock(&lport->lp_mutex); 1359 } 1360 1361 /** 1362 * fc_lport_logo_resp - Handle response to LOGO request 1363 * @sp: current sequence in LOGO exchange 1364 * @fp: response frame 1365 * @lp_arg: Fibre Channel lport port instance that sent the LOGO request 1366 * 1367 * Locking Note: This function will be called without the lport lock 1368 * held, but it will lock, call an _enter_* function or fc_lport_error 1369 * and then unlock the lport. 1370 */ 1371 static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1372 void *lp_arg) 1373 { 1374 struct fc_lport *lport = lp_arg; 1375 u8 op; 1376 1377 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1378 return; 1379 1380 mutex_lock(&lport->lp_mutex); 1381 1382 FC_DEBUG_LPORT("Received a LOGO response\n"); 1383 1384 if (lport->state != LPORT_ST_LOGO) { 1385 FC_DBG("Received a LOGO response, but in state %s\n", 1386 fc_lport_state(lport)); 1387 goto out; 1388 } 1389 1390 if (IS_ERR(fp)) { 1391 fc_lport_error(lport, fp); 1392 goto err; 1393 } 1394 1395 op = fc_frame_payload_op(fp); 1396 if (op == ELS_LS_ACC) 1397 fc_lport_enter_reset(lport); 1398 else 1399 fc_lport_error(lport, fp); 1400 1401 out: 1402 fc_frame_free(fp); 1403 err: 1404 mutex_unlock(&lport->lp_mutex); 1405 } 1406 1407 /** 1408 * fc_rport_enter_logo - Logout of the fabric 1409 * @lport: Fibre Channel local port to be logged out 1410 * 1411 * Locking Note: The lport lock is expected to be held before calling 1412 * this routine. 1413 */ 1414 static void fc_lport_enter_logo(struct fc_lport *lport) 1415 { 1416 struct fc_frame *fp; 1417 struct fc_els_logo *logo; 1418 1419 FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n", 1420 fc_host_port_id(lport->host), fc_lport_state(lport)); 1421 1422 fc_lport_state_enter(lport, LPORT_ST_LOGO); 1423 1424 /* DNS session should be closed so we can release it here */ 1425 if (lport->dns_rp) 1426 lport->tt.rport_logoff(lport->dns_rp); 1427 1428 fp = fc_frame_alloc(lport, sizeof(*logo)); 1429 if (!fp) { 1430 fc_lport_error(lport, fp); 1431 return; 1432 } 1433 1434 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp, 1435 lport, lport->e_d_tov)) 1436 fc_lport_error(lport, fp); 1437 } 1438 1439 /** 1440 * fc_lport_flogi_resp - Handle response to FLOGI request 1441 * @sp: current sequence in FLOGI exchange 1442 * @fp: response frame 1443 * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request 1444 * 1445 * Locking Note: This function will be called without the lport lock 1446 * held, but it will lock, call an _enter_* function or fc_lport_error 1447 * and then unlock the lport. 1448 */ 1449 static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 1450 void *lp_arg) 1451 { 1452 struct fc_lport *lport = lp_arg; 1453 struct fc_frame_header *fh; 1454 struct fc_els_flogi *flp; 1455 u32 did; 1456 u16 csp_flags; 1457 unsigned int r_a_tov; 1458 unsigned int e_d_tov; 1459 u16 mfs; 1460 1461 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1462 return; 1463 1464 mutex_lock(&lport->lp_mutex); 1465 1466 FC_DEBUG_LPORT("Received a FLOGI response\n"); 1467 1468 if (lport->state != LPORT_ST_FLOGI) { 1469 FC_DBG("Received a FLOGI response, but in state %s\n", 1470 fc_lport_state(lport)); 1471 goto out; 1472 } 1473 1474 if (IS_ERR(fp)) { 1475 fc_lport_error(lport, fp); 1476 goto err; 1477 } 1478 1479 fh = fc_frame_header_get(fp); 1480 did = ntoh24(fh->fh_d_id); 1481 if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { 1482 1483 FC_DEBUG_LPORT("Assigned fid %x\n", did); 1484 fc_host_port_id(lport->host) = did; 1485 1486 flp = fc_frame_payload_get(fp, sizeof(*flp)); 1487 if (flp) { 1488 mfs = ntohs(flp->fl_csp.sp_bb_data) & 1489 FC_SP_BB_DATA_MASK; 1490 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && 1491 mfs < lport->mfs) 1492 lport->mfs = mfs; 1493 csp_flags = ntohs(flp->fl_csp.sp_features); 1494 r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); 1495 e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); 1496 if (csp_flags & FC_SP_FT_EDTR) 1497 e_d_tov /= 1000000; 1498 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1499 if (e_d_tov > lport->e_d_tov) 1500 lport->e_d_tov = e_d_tov; 1501 lport->r_a_tov = 2 * e_d_tov; 1502 FC_DBG("Point-to-Point mode\n"); 1503 fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), 1504 get_unaligned_be64( 1505 &flp->fl_wwpn), 1506 get_unaligned_be64( 1507 &flp->fl_wwnn)); 1508 } else { 1509 lport->e_d_tov = e_d_tov; 1510 lport->r_a_tov = r_a_tov; 1511 fc_host_fabric_name(lport->host) = 1512 get_unaligned_be64(&flp->fl_wwnn); 1513 fc_lport_enter_dns(lport); 1514 } 1515 } 1516 1517 if (flp) { 1518 csp_flags = ntohs(flp->fl_csp.sp_features); 1519 if ((csp_flags & FC_SP_FT_FPORT) == 0) { 1520 lport->tt.disc_start(fc_lport_disc_callback, 1521 lport); 1522 } 1523 } 1524 } else { 1525 FC_DBG("bad FLOGI response\n"); 1526 } 1527 1528 out: 1529 fc_frame_free(fp); 1530 err: 1531 mutex_unlock(&lport->lp_mutex); 1532 } 1533 1534 /** 1535 * fc_rport_enter_flogi - Send a FLOGI request to the fabric manager 1536 * @lport: Fibre Channel local port to be logged in to the fabric 1537 * 1538 * Locking Note: The lport lock is expected to be held before calling 1539 * this routine. 1540 */ 1541 void fc_lport_enter_flogi(struct fc_lport *lport) 1542 { 1543 struct fc_frame *fp; 1544 1545 FC_DEBUG_LPORT("Processing FLOGI state\n"); 1546 1547 fc_lport_state_enter(lport, LPORT_ST_FLOGI); 1548 1549 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 1550 if (!fp) 1551 return fc_lport_error(lport, fp); 1552 1553 if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI, 1554 fc_lport_flogi_resp, lport, lport->e_d_tov)) 1555 fc_lport_error(lport, fp); 1556 } 1557 1558 /* Configure a fc_lport */ 1559 int fc_lport_config(struct fc_lport *lport) 1560 { 1561 INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); 1562 mutex_init(&lport->lp_mutex); 1563 1564 fc_lport_state_enter(lport, LPORT_ST_NONE); 1565 1566 fc_lport_add_fc4_type(lport, FC_TYPE_FCP); 1567 fc_lport_add_fc4_type(lport, FC_TYPE_CT); 1568 1569 return 0; 1570 } 1571 EXPORT_SYMBOL(fc_lport_config); 1572 1573 int fc_lport_init(struct fc_lport *lport) 1574 { 1575 if (!lport->tt.lport_recv) 1576 lport->tt.lport_recv = fc_lport_recv_req; 1577 1578 if (!lport->tt.lport_reset) 1579 lport->tt.lport_reset = fc_lport_reset; 1580 1581 fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; 1582 fc_host_node_name(lport->host) = lport->wwnn; 1583 fc_host_port_name(lport->host) = lport->wwpn; 1584 fc_host_supported_classes(lport->host) = FC_COS_CLASS3; 1585 memset(fc_host_supported_fc4s(lport->host), 0, 1586 sizeof(fc_host_supported_fc4s(lport->host))); 1587 fc_host_supported_fc4s(lport->host)[2] = 1; 1588 fc_host_supported_fc4s(lport->host)[7] = 1; 1589 1590 /* This value is also unchanging */ 1591 memset(fc_host_active_fc4s(lport->host), 0, 1592 sizeof(fc_host_active_fc4s(lport->host))); 1593 fc_host_active_fc4s(lport->host)[2] = 1; 1594 fc_host_active_fc4s(lport->host)[7] = 1; 1595 fc_host_maxframe_size(lport->host) = lport->mfs; 1596 fc_host_supported_speeds(lport->host) = 0; 1597 if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) 1598 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; 1599 if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) 1600 fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; 1601 1602 return 0; 1603 } 1604 EXPORT_SYMBOL(fc_lport_init); 1605