1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. 4 * 5 * Maintained at www.Open-FCoE.org 6 */ 7 8/* 9 * RPORT GENERAL INFO 10 * 11 * This file contains all processing regarding fc_rports. It contains the 12 * rport state machine and does all rport interaction with the transport class. 13 * There should be no other places in libfc that interact directly with the 14 * transport class in regards to adding and deleting rports. 15 * 16 * fc_rport's represent N_Port's within the fabric. 17 */ 18 19/* 20 * RPORT LOCKING 21 * 22 * The rport should never hold the rport mutex and then attempt to acquire 23 * either the lport or disc mutexes. The rport's mutex is considered lesser 24 * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for 25 * more comments on the hierarchy. 26 * 27 * The locking strategy is similar to the lport's strategy. The lock protects 28 * the rport's states and is held and released by the entry points to the rport 29 * block. All _enter_* functions correspond to rport states and expect the rport 30 * mutex to be locked before calling them. This means that rports only handle 31 * one request or response at a time, since they're not critical for the I/O 32 * path this potential over-use of the mutex is acceptable. 33 */ 34 35/* 36 * RPORT REFERENCE COUNTING 37 * 38 * A rport reference should be taken when: 39 * - an rport is allocated 40 * - a workqueue item is scheduled 41 * - an ELS request is send 42 * The reference should be dropped when: 43 * - the workqueue function has finished 44 * - the ELS response is handled 45 * - an rport is removed 46 */ 47 48#include <linux/kernel.h> 49#include <linux/spinlock.h> 50#include <linux/interrupt.h> 51#include <linux/slab.h> 52#include <linux/rcupdate.h> 53#include <linux/timer.h> 54#include <linux/workqueue.h> 55#include <linux/export.h> 56#include <linux/rculist.h> 57 58#include <asm/unaligned.h> 59 60#include <scsi/libfc.h> 61 62#include "fc_encode.h" 63#include "fc_libfc.h" 64 65static struct workqueue_struct *rport_event_queue; 66 67static void fc_rport_enter_flogi(struct fc_rport_priv *); 68static void fc_rport_enter_plogi(struct fc_rport_priv *); 69static void fc_rport_enter_prli(struct fc_rport_priv *); 70static void fc_rport_enter_rtv(struct fc_rport_priv *); 71static void fc_rport_enter_ready(struct fc_rport_priv *); 72static void fc_rport_enter_logo(struct fc_rport_priv *); 73static void fc_rport_enter_adisc(struct fc_rport_priv *); 74 75static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *); 76static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *); 77static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *); 78static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *); 79static void fc_rport_timeout(struct work_struct *); 80static void fc_rport_error(struct fc_rport_priv *, int); 81static void fc_rport_error_retry(struct fc_rport_priv *, int); 82static void fc_rport_work(struct work_struct *); 83 84static const char *fc_rport_state_names[] = { 85 [RPORT_ST_INIT] = "Init", 86 [RPORT_ST_FLOGI] = "FLOGI", 87 [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT", 88 [RPORT_ST_PLOGI] = "PLOGI", 89 [RPORT_ST_PRLI] = "PRLI", 90 [RPORT_ST_RTV] = "RTV", 91 [RPORT_ST_READY] = "Ready", 92 [RPORT_ST_ADISC] = "ADISC", 93 [RPORT_ST_DELETE] = "Delete", 94}; 95 96/** 97 * fc_rport_lookup() - Lookup a remote port by port_id 98 * @lport: The local port to lookup the remote port on 99 * @port_id: The remote port ID to look up 100 * 101 * The reference count of the fc_rport_priv structure is 102 * increased by one. 103 */ 104struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, 105 u32 port_id) 106{ 107 struct fc_rport_priv *rdata = NULL, *tmp_rdata; 108 109 rcu_read_lock(); 110 list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers) 111 if (tmp_rdata->ids.port_id == port_id && 112 kref_get_unless_zero(&tmp_rdata->kref)) { 113 rdata = tmp_rdata; 114 break; 115 } 116 rcu_read_unlock(); 117 return rdata; 118} 119EXPORT_SYMBOL(fc_rport_lookup); 120 121/** 122 * fc_rport_create() - Create a new remote port 123 * @lport: The local port this remote port will be associated with 124 * @port_id: The identifiers for the new remote port 125 * 126 * The remote port will start in the INIT state. 127 */ 128struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id) 129{ 130 struct fc_rport_priv *rdata; 131 size_t rport_priv_size = sizeof(*rdata); 132 133 lockdep_assert_held(&lport->disc.disc_mutex); 134 135 rdata = fc_rport_lookup(lport, port_id); 136 if (rdata) { 137 kref_put(&rdata->kref, fc_rport_destroy); 138 return rdata; 139 } 140 141 if (lport->rport_priv_size > 0) 142 rport_priv_size = lport->rport_priv_size; 143 rdata = kzalloc(rport_priv_size, GFP_KERNEL); 144 if (!rdata) 145 return NULL; 146 147 rdata->ids.node_name = -1; 148 rdata->ids.port_name = -1; 149 rdata->ids.port_id = port_id; 150 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 151 152 kref_init(&rdata->kref); 153 mutex_init(&rdata->rp_mutex); 154 rdata->local_port = lport; 155 rdata->rp_state = RPORT_ST_INIT; 156 rdata->event = RPORT_EV_NONE; 157 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; 158 rdata->e_d_tov = lport->e_d_tov; 159 rdata->r_a_tov = lport->r_a_tov; 160 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 161 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); 162 INIT_WORK(&rdata->event_work, fc_rport_work); 163 if (port_id != FC_FID_DIR_SERV) { 164 rdata->lld_event_callback = lport->tt.rport_event_callback; 165 list_add_rcu(&rdata->peers, &lport->disc.rports); 166 } 167 return rdata; 168} 169EXPORT_SYMBOL(fc_rport_create); 170 171/** 172 * fc_rport_destroy() - Free a remote port after last reference is released 173 * @kref: The remote port's kref 174 */ 175void fc_rport_destroy(struct kref *kref) 176{ 177 struct fc_rport_priv *rdata; 178 179 rdata = container_of(kref, struct fc_rport_priv, kref); 180 kfree_rcu(rdata, rcu); 181} 182EXPORT_SYMBOL(fc_rport_destroy); 183 184/** 185 * fc_rport_state() - Return a string identifying the remote port's state 186 * @rdata: The remote port 187 */ 188static const char *fc_rport_state(struct fc_rport_priv *rdata) 189{ 190 const char *cp; 191 192 cp = fc_rport_state_names[rdata->rp_state]; 193 if (!cp) 194 cp = "Unknown"; 195 return cp; 196} 197 198/** 199 * fc_set_rport_loss_tmo() - Set the remote port loss timeout 200 * @rport: The remote port that gets a new timeout value 201 * @timeout: The new timeout value (in seconds) 202 */ 203void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) 204{ 205 if (timeout) 206 rport->dev_loss_tmo = timeout; 207 else 208 rport->dev_loss_tmo = 1; 209} 210EXPORT_SYMBOL(fc_set_rport_loss_tmo); 211 212/** 213 * fc_plogi_get_maxframe() - Get the maximum payload from the common service 214 * parameters in a FLOGI frame 215 * @flp: The FLOGI or PLOGI payload 216 * @maxval: The maximum frame size upper limit; this may be less than what 217 * is in the service parameters 218 */ 219static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, 220 unsigned int maxval) 221{ 222 unsigned int mfs; 223 224 /* 225 * Get max payload from the common service parameters and the 226 * class 3 receive data field size. 227 */ 228 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; 229 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 230 maxval = mfs; 231 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); 232 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) 233 maxval = mfs; 234 return maxval; 235} 236 237/** 238 * fc_rport_state_enter() - Change the state of a remote port 239 * @rdata: The remote port whose state should change 240 * @new: The new state 241 */ 242static void fc_rport_state_enter(struct fc_rport_priv *rdata, 243 enum fc_rport_state new) 244{ 245 lockdep_assert_held(&rdata->rp_mutex); 246 247 if (rdata->rp_state != new) 248 rdata->retries = 0; 249 rdata->rp_state = new; 250} 251 252/** 253 * fc_rport_work() - Handler for remote port events in the rport_event_queue 254 * @work: Handle to the remote port being dequeued 255 * 256 * Reference counting: drops kref on return 257 */ 258static void fc_rport_work(struct work_struct *work) 259{ 260 u32 port_id; 261 struct fc_rport_priv *rdata = 262 container_of(work, struct fc_rport_priv, event_work); 263 struct fc_rport_libfc_priv *rpriv; 264 enum fc_rport_event event; 265 struct fc_lport *lport = rdata->local_port; 266 struct fc_rport_operations *rport_ops; 267 struct fc_rport_identifiers ids; 268 struct fc_rport *rport; 269 struct fc4_prov *prov; 270 u8 type; 271 272 mutex_lock(&rdata->rp_mutex); 273 event = rdata->event; 274 rport_ops = rdata->ops; 275 rport = rdata->rport; 276 277 FC_RPORT_DBG(rdata, "work event %u\n", event); 278 279 switch (event) { 280 case RPORT_EV_READY: 281 ids = rdata->ids; 282 rdata->event = RPORT_EV_NONE; 283 rdata->major_retries = 0; 284 kref_get(&rdata->kref); 285 mutex_unlock(&rdata->rp_mutex); 286 287 if (!rport) { 288 FC_RPORT_DBG(rdata, "No rport!\n"); 289 rport = fc_remote_port_add(lport->host, 0, &ids); 290 } 291 if (!rport) { 292 FC_RPORT_DBG(rdata, "Failed to add the rport\n"); 293 fc_rport_logoff(rdata); 294 kref_put(&rdata->kref, fc_rport_destroy); 295 return; 296 } 297 mutex_lock(&rdata->rp_mutex); 298 if (rdata->rport) 299 FC_RPORT_DBG(rdata, "rport already allocated\n"); 300 rdata->rport = rport; 301 rport->maxframe_size = rdata->maxframe_size; 302 rport->supported_classes = rdata->supported_classes; 303 304 rpriv = rport->dd_data; 305 rpriv->local_port = lport; 306 rpriv->rp_state = rdata->rp_state; 307 rpriv->flags = rdata->flags; 308 rpriv->e_d_tov = rdata->e_d_tov; 309 rpriv->r_a_tov = rdata->r_a_tov; 310 mutex_unlock(&rdata->rp_mutex); 311 312 if (rport_ops && rport_ops->event_callback) { 313 FC_RPORT_DBG(rdata, "callback ev %d\n", event); 314 rport_ops->event_callback(lport, rdata, event); 315 } 316 if (rdata->lld_event_callback) { 317 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); 318 rdata->lld_event_callback(lport, rdata, event); 319 } 320 kref_put(&rdata->kref, fc_rport_destroy); 321 break; 322 323 case RPORT_EV_FAILED: 324 case RPORT_EV_LOGO: 325 case RPORT_EV_STOP: 326 if (rdata->prli_count) { 327 mutex_lock(&fc_prov_mutex); 328 for (type = 1; type < FC_FC4_PROV_SIZE; type++) { 329 prov = fc_passive_prov[type]; 330 if (prov && prov->prlo) 331 prov->prlo(rdata); 332 } 333 mutex_unlock(&fc_prov_mutex); 334 } 335 port_id = rdata->ids.port_id; 336 mutex_unlock(&rdata->rp_mutex); 337 338 if (rport_ops && rport_ops->event_callback) { 339 FC_RPORT_DBG(rdata, "callback ev %d\n", event); 340 rport_ops->event_callback(lport, rdata, event); 341 } 342 if (rdata->lld_event_callback) { 343 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); 344 rdata->lld_event_callback(lport, rdata, event); 345 } 346 if (cancel_delayed_work_sync(&rdata->retry_work)) 347 kref_put(&rdata->kref, fc_rport_destroy); 348 349 /* 350 * Reset any outstanding exchanges before freeing rport. 351 */ 352 lport->tt.exch_mgr_reset(lport, 0, port_id); 353 lport->tt.exch_mgr_reset(lport, port_id, 0); 354 355 if (rport) { 356 rpriv = rport->dd_data; 357 rpriv->rp_state = RPORT_ST_DELETE; 358 mutex_lock(&rdata->rp_mutex); 359 rdata->rport = NULL; 360 mutex_unlock(&rdata->rp_mutex); 361 fc_remote_port_delete(rport); 362 } 363 364 mutex_lock(&rdata->rp_mutex); 365 if (rdata->rp_state == RPORT_ST_DELETE) { 366 if (port_id == FC_FID_DIR_SERV) { 367 rdata->event = RPORT_EV_NONE; 368 mutex_unlock(&rdata->rp_mutex); 369 kref_put(&rdata->kref, fc_rport_destroy); 370 } else if ((rdata->flags & FC_RP_STARTED) && 371 rdata->major_retries < 372 lport->max_rport_retry_count) { 373 rdata->major_retries++; 374 rdata->event = RPORT_EV_NONE; 375 FC_RPORT_DBG(rdata, "work restart\n"); 376 fc_rport_enter_flogi(rdata); 377 mutex_unlock(&rdata->rp_mutex); 378 } else { 379 mutex_unlock(&rdata->rp_mutex); 380 FC_RPORT_DBG(rdata, "work delete\n"); 381 mutex_lock(&lport->disc.disc_mutex); 382 list_del_rcu(&rdata->peers); 383 mutex_unlock(&lport->disc.disc_mutex); 384 kref_put(&rdata->kref, fc_rport_destroy); 385 } 386 } else { 387 /* 388 * Re-open for events. Reissue READY event if ready. 389 */ 390 rdata->event = RPORT_EV_NONE; 391 if (rdata->rp_state == RPORT_ST_READY) { 392 FC_RPORT_DBG(rdata, "work reopen\n"); 393 fc_rport_enter_ready(rdata); 394 } 395 mutex_unlock(&rdata->rp_mutex); 396 } 397 break; 398 399 default: 400 mutex_unlock(&rdata->rp_mutex); 401 break; 402 } 403 kref_put(&rdata->kref, fc_rport_destroy); 404} 405 406/** 407 * fc_rport_login() - Start the remote port login state machine 408 * @rdata: The remote port to be logged in to 409 * 410 * Initiates the RP state machine. It is called from the LP module. 411 * This function will issue the following commands to the N_Port 412 * identified by the FC ID provided. 413 * 414 * - PLOGI 415 * - PRLI 416 * - RTV 417 * 418 * Locking Note: Called without the rport lock held. This 419 * function will hold the rport lock, call an _enter_* 420 * function and then unlock the rport. 421 * 422 * This indicates the intent to be logged into the remote port. 423 * If it appears we are already logged in, ADISC is used to verify 424 * the setup. 425 */ 426int fc_rport_login(struct fc_rport_priv *rdata) 427{ 428 mutex_lock(&rdata->rp_mutex); 429 430 if (rdata->flags & FC_RP_STARTED) { 431 FC_RPORT_DBG(rdata, "port already started\n"); 432 mutex_unlock(&rdata->rp_mutex); 433 return 0; 434 } 435 436 rdata->flags |= FC_RP_STARTED; 437 switch (rdata->rp_state) { 438 case RPORT_ST_READY: 439 FC_RPORT_DBG(rdata, "ADISC port\n"); 440 fc_rport_enter_adisc(rdata); 441 break; 442 case RPORT_ST_DELETE: 443 FC_RPORT_DBG(rdata, "Restart deleted port\n"); 444 break; 445 case RPORT_ST_INIT: 446 FC_RPORT_DBG(rdata, "Login to port\n"); 447 fc_rport_enter_flogi(rdata); 448 break; 449 default: 450 FC_RPORT_DBG(rdata, "Login in progress, state %s\n", 451 fc_rport_state(rdata)); 452 break; 453 } 454 mutex_unlock(&rdata->rp_mutex); 455 456 return 0; 457} 458EXPORT_SYMBOL(fc_rport_login); 459 460/** 461 * fc_rport_enter_delete() - Schedule a remote port to be deleted 462 * @rdata: The remote port to be deleted 463 * @event: The event to report as the reason for deletion 464 * 465 * Allow state change into DELETE only once. 466 * 467 * Call queue_work only if there's no event already pending. 468 * Set the new event so that the old pending event will not occur. 469 * Since we have the mutex, even if fc_rport_work() is already started, 470 * it'll see the new event. 471 * 472 * Reference counting: does not modify kref 473 */ 474static void fc_rport_enter_delete(struct fc_rport_priv *rdata, 475 enum fc_rport_event event) 476{ 477 lockdep_assert_held(&rdata->rp_mutex); 478 479 if (rdata->rp_state == RPORT_ST_DELETE) 480 return; 481 482 FC_RPORT_DBG(rdata, "Delete port\n"); 483 484 fc_rport_state_enter(rdata, RPORT_ST_DELETE); 485 486 if (rdata->event == RPORT_EV_NONE) { 487 kref_get(&rdata->kref); 488 if (!queue_work(rport_event_queue, &rdata->event_work)) 489 kref_put(&rdata->kref, fc_rport_destroy); 490 } 491 492 rdata->event = event; 493} 494 495/** 496 * fc_rport_logoff() - Logoff and remove a remote port 497 * @rdata: The remote port to be logged off of 498 * 499 * Locking Note: Called without the rport lock held. This 500 * function will hold the rport lock, call an _enter_* 501 * function and then unlock the rport. 502 */ 503int fc_rport_logoff(struct fc_rport_priv *rdata) 504{ 505 struct fc_lport *lport = rdata->local_port; 506 u32 port_id = rdata->ids.port_id; 507 508 mutex_lock(&rdata->rp_mutex); 509 510 FC_RPORT_DBG(rdata, "Remove port\n"); 511 512 rdata->flags &= ~FC_RP_STARTED; 513 if (rdata->rp_state == RPORT_ST_DELETE) { 514 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); 515 goto out; 516 } 517 /* 518 * FC-LS states: 519 * To explicitly Logout, the initiating Nx_Port shall terminate 520 * other open Sequences that it initiated with the destination 521 * Nx_Port prior to performing Logout. 522 */ 523 lport->tt.exch_mgr_reset(lport, 0, port_id); 524 lport->tt.exch_mgr_reset(lport, port_id, 0); 525 526 fc_rport_enter_logo(rdata); 527 528 /* 529 * Change the state to Delete so that we discard 530 * the response. 531 */ 532 fc_rport_enter_delete(rdata, RPORT_EV_STOP); 533out: 534 mutex_unlock(&rdata->rp_mutex); 535 return 0; 536} 537EXPORT_SYMBOL(fc_rport_logoff); 538 539/** 540 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state 541 * @rdata: The remote port that is ready 542 * 543 * Reference counting: schedules workqueue, does not modify kref 544 */ 545static void fc_rport_enter_ready(struct fc_rport_priv *rdata) 546{ 547 lockdep_assert_held(&rdata->rp_mutex); 548 549 fc_rport_state_enter(rdata, RPORT_ST_READY); 550 551 FC_RPORT_DBG(rdata, "Port is Ready\n"); 552 553 kref_get(&rdata->kref); 554 if (rdata->event == RPORT_EV_NONE && 555 !queue_work(rport_event_queue, &rdata->event_work)) 556 kref_put(&rdata->kref, fc_rport_destroy); 557 558 rdata->event = RPORT_EV_READY; 559} 560 561/** 562 * fc_rport_timeout() - Handler for the retry_work timer 563 * @work: Handle to the remote port that has timed out 564 * 565 * Locking Note: Called without the rport lock held. This 566 * function will hold the rport lock, call an _enter_* 567 * function and then unlock the rport. 568 * 569 * Reference counting: Drops kref on return. 570 */ 571static void fc_rport_timeout(struct work_struct *work) 572{ 573 struct fc_rport_priv *rdata = 574 container_of(work, struct fc_rport_priv, retry_work.work); 575 576 mutex_lock(&rdata->rp_mutex); 577 FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata)); 578 579 switch (rdata->rp_state) { 580 case RPORT_ST_FLOGI: 581 fc_rport_enter_flogi(rdata); 582 break; 583 case RPORT_ST_PLOGI: 584 fc_rport_enter_plogi(rdata); 585 break; 586 case RPORT_ST_PRLI: 587 fc_rport_enter_prli(rdata); 588 break; 589 case RPORT_ST_RTV: 590 fc_rport_enter_rtv(rdata); 591 break; 592 case RPORT_ST_ADISC: 593 fc_rport_enter_adisc(rdata); 594 break; 595 case RPORT_ST_PLOGI_WAIT: 596 case RPORT_ST_READY: 597 case RPORT_ST_INIT: 598 case RPORT_ST_DELETE: 599 break; 600 } 601 602 mutex_unlock(&rdata->rp_mutex); 603 kref_put(&rdata->kref, fc_rport_destroy); 604} 605 606/** 607 * fc_rport_error() - Error handler, called once retries have been exhausted 608 * @rdata: The remote port the error is happened on 609 * @err: The error code 610 * 611 * Reference counting: does not modify kref 612 */ 613static void fc_rport_error(struct fc_rport_priv *rdata, int err) 614{ 615 struct fc_lport *lport = rdata->local_port; 616 617 lockdep_assert_held(&rdata->rp_mutex); 618 619 FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n", 620 -err, fc_rport_state(rdata), rdata->retries); 621 622 switch (rdata->rp_state) { 623 case RPORT_ST_FLOGI: 624 rdata->flags &= ~FC_RP_STARTED; 625 fc_rport_enter_delete(rdata, RPORT_EV_FAILED); 626 break; 627 case RPORT_ST_PLOGI: 628 if (lport->point_to_multipoint) { 629 rdata->flags &= ~FC_RP_STARTED; 630 fc_rport_enter_delete(rdata, RPORT_EV_FAILED); 631 } else 632 fc_rport_enter_logo(rdata); 633 break; 634 case RPORT_ST_RTV: 635 fc_rport_enter_ready(rdata); 636 break; 637 case RPORT_ST_PRLI: 638 fc_rport_enter_plogi(rdata); 639 break; 640 case RPORT_ST_ADISC: 641 fc_rport_enter_logo(rdata); 642 break; 643 case RPORT_ST_PLOGI_WAIT: 644 case RPORT_ST_DELETE: 645 case RPORT_ST_READY: 646 case RPORT_ST_INIT: 647 break; 648 } 649} 650 651/** 652 * fc_rport_error_retry() - Handler for remote port state retries 653 * @rdata: The remote port whose state is to be retried 654 * @err: The error code 655 * 656 * If the error was an exchange timeout retry immediately, 657 * otherwise wait for E_D_TOV. 658 * 659 * Reference counting: increments kref when scheduling retry_work 660 */ 661static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err) 662{ 663 unsigned long delay = msecs_to_jiffies(rdata->e_d_tov); 664 665 lockdep_assert_held(&rdata->rp_mutex); 666 667 /* make sure this isn't an FC_EX_CLOSED error, never retry those */ 668 if (err == -FC_EX_CLOSED) 669 goto out; 670 671 if (rdata->retries < rdata->local_port->max_rport_retry_count) { 672 FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n", 673 err, fc_rport_state(rdata)); 674 rdata->retries++; 675 /* no additional delay on exchange timeouts */ 676 if (err == -FC_EX_TIMEOUT) 677 delay = 0; 678 kref_get(&rdata->kref); 679 if (!schedule_delayed_work(&rdata->retry_work, delay)) 680 kref_put(&rdata->kref, fc_rport_destroy); 681 return; 682 } 683 684out: 685 fc_rport_error(rdata, err); 686} 687 688/** 689 * fc_rport_login_complete() - Handle parameters and completion of p-mp login. 690 * @rdata: The remote port which we logged into or which logged into us. 691 * @fp: The FLOGI or PLOGI request or response frame 692 * 693 * Returns non-zero error if a problem is detected with the frame. 694 * Does not free the frame. 695 * 696 * This is only used in point-to-multipoint mode for FIP currently. 697 */ 698static int fc_rport_login_complete(struct fc_rport_priv *rdata, 699 struct fc_frame *fp) 700{ 701 struct fc_lport *lport = rdata->local_port; 702 struct fc_els_flogi *flogi; 703 unsigned int e_d_tov; 704 u16 csp_flags; 705 706 flogi = fc_frame_payload_get(fp, sizeof(*flogi)); 707 if (!flogi) 708 return -EINVAL; 709 710 csp_flags = ntohs(flogi->fl_csp.sp_features); 711 712 if (fc_frame_payload_op(fp) == ELS_FLOGI) { 713 if (csp_flags & FC_SP_FT_FPORT) { 714 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n"); 715 return -EINVAL; 716 } 717 } else { 718 719 /* 720 * E_D_TOV is not valid on an incoming FLOGI request. 721 */ 722 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov); 723 if (csp_flags & FC_SP_FT_EDTR) 724 e_d_tov /= 1000000; 725 if (e_d_tov > rdata->e_d_tov) 726 rdata->e_d_tov = e_d_tov; 727 } 728 rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs); 729 return 0; 730} 731 732/** 733 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode 734 * @sp: The sequence that the FLOGI was on 735 * @fp: The FLOGI response frame 736 * @rp_arg: The remote port that received the FLOGI response 737 */ 738static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, 739 void *rp_arg) 740{ 741 struct fc_rport_priv *rdata = rp_arg; 742 struct fc_lport *lport = rdata->local_port; 743 struct fc_els_flogi *flogi; 744 unsigned int r_a_tov; 745 u8 opcode; 746 int err = 0; 747 748 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", 749 IS_ERR(fp) ? "error" : fc_els_resp_type(fp)); 750 751 if (fp == ERR_PTR(-FC_EX_CLOSED)) 752 goto put; 753 754 mutex_lock(&rdata->rp_mutex); 755 756 if (rdata->rp_state != RPORT_ST_FLOGI) { 757 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state " 758 "%s\n", fc_rport_state(rdata)); 759 if (IS_ERR(fp)) 760 goto err; 761 goto out; 762 } 763 764 if (IS_ERR(fp)) { 765 fc_rport_error(rdata, PTR_ERR(fp)); 766 goto err; 767 } 768 opcode = fc_frame_payload_op(fp); 769 if (opcode == ELS_LS_RJT) { 770 struct fc_els_ls_rjt *rjt; 771 772 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 773 FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n", 774 rjt->er_reason, rjt->er_explan); 775 err = -FC_EX_ELS_RJT; 776 goto bad; 777 } else if (opcode != ELS_LS_ACC) { 778 FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode); 779 err = -FC_EX_ELS_RJT; 780 goto bad; 781 } 782 if (fc_rport_login_complete(rdata, fp)) { 783 FC_RPORT_DBG(rdata, "FLOGI failed, no login\n"); 784 err = -FC_EX_INV_LOGIN; 785 goto bad; 786 } 787 788 flogi = fc_frame_payload_get(fp, sizeof(*flogi)); 789 if (!flogi) { 790 err = -FC_EX_ALLOC_ERR; 791 goto bad; 792 } 793 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov); 794 if (r_a_tov > rdata->r_a_tov) 795 rdata->r_a_tov = r_a_tov; 796 797 if (rdata->ids.port_name < lport->wwpn) 798 fc_rport_enter_plogi(rdata); 799 else 800 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); 801out: 802 fc_frame_free(fp); 803err: 804 mutex_unlock(&rdata->rp_mutex); 805put: 806 kref_put(&rdata->kref, fc_rport_destroy); 807 return; 808bad: 809 FC_RPORT_DBG(rdata, "Bad FLOGI response\n"); 810 fc_rport_error_retry(rdata, err); 811 goto out; 812} 813 814/** 815 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp 816 * @rdata: The remote port to send a FLOGI to 817 * 818 * Reference counting: increments kref when sending ELS 819 */ 820static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) 821{ 822 struct fc_lport *lport = rdata->local_port; 823 struct fc_frame *fp; 824 825 lockdep_assert_held(&rdata->rp_mutex); 826 827 if (!lport->point_to_multipoint) 828 return fc_rport_enter_plogi(rdata); 829 830 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n", 831 fc_rport_state(rdata)); 832 833 fc_rport_state_enter(rdata, RPORT_ST_FLOGI); 834 835 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 836 if (!fp) 837 return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); 838 839 kref_get(&rdata->kref); 840 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI, 841 fc_rport_flogi_resp, rdata, 842 2 * lport->r_a_tov)) { 843 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); 844 kref_put(&rdata->kref, fc_rport_destroy); 845 } 846} 847 848/** 849 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode 850 * @lport: The local port that received the PLOGI request 851 * @rx_fp: The PLOGI request frame 852 * 853 * Reference counting: drops kref on return 854 */ 855static void fc_rport_recv_flogi_req(struct fc_lport *lport, 856 struct fc_frame *rx_fp) 857{ 858 struct fc_els_flogi *flp; 859 struct fc_rport_priv *rdata; 860 struct fc_frame *fp = rx_fp; 861 struct fc_seq_els_data rjt_data; 862 u32 sid; 863 864 sid = fc_frame_sid(fp); 865 866 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); 867 868 if (!lport->point_to_multipoint) { 869 rjt_data.reason = ELS_RJT_UNSUP; 870 rjt_data.explan = ELS_EXPL_NONE; 871 goto reject; 872 } 873 874 flp = fc_frame_payload_get(fp, sizeof(*flp)); 875 if (!flp) { 876 rjt_data.reason = ELS_RJT_LOGIC; 877 rjt_data.explan = ELS_EXPL_INV_LEN; 878 goto reject; 879 } 880 881 rdata = fc_rport_lookup(lport, sid); 882 if (!rdata) { 883 rjt_data.reason = ELS_RJT_FIP; 884 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; 885 goto reject; 886 } 887 mutex_lock(&rdata->rp_mutex); 888 889 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", 890 fc_rport_state(rdata)); 891 892 switch (rdata->rp_state) { 893 case RPORT_ST_INIT: 894 /* 895 * If received the FLOGI request on RPORT which is INIT state 896 * (means not transition to FLOGI either fc_rport timeout 897 * function didn;t trigger or this end hasn;t received 898 * beacon yet from other end. In that case only, allow RPORT 899 * state machine to continue, otherwise fall through which 900 * causes the code to send reject response. 901 * NOTE; Not checking for FIP->state such as VNMP_UP or 902 * VNMP_CLAIM because if FIP state is not one of those, 903 * RPORT wouldn;t have created and 'rport_lookup' would have 904 * failed anyway in that case. 905 */ 906 break; 907 case RPORT_ST_DELETE: 908 mutex_unlock(&rdata->rp_mutex); 909 rjt_data.reason = ELS_RJT_FIP; 910 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; 911 goto reject_put; 912 case RPORT_ST_FLOGI: 913 case RPORT_ST_PLOGI_WAIT: 914 case RPORT_ST_PLOGI: 915 break; 916 case RPORT_ST_PRLI: 917 case RPORT_ST_RTV: 918 case RPORT_ST_READY: 919 case RPORT_ST_ADISC: 920 /* 921 * Set the remote port to be deleted and to then restart. 922 * This queues work to be sure exchanges are reset. 923 */ 924 fc_rport_enter_delete(rdata, RPORT_EV_LOGO); 925 mutex_unlock(&rdata->rp_mutex); 926 rjt_data.reason = ELS_RJT_BUSY; 927 rjt_data.explan = ELS_EXPL_NONE; 928 goto reject_put; 929 } 930 if (fc_rport_login_complete(rdata, fp)) { 931 mutex_unlock(&rdata->rp_mutex); 932 rjt_data.reason = ELS_RJT_LOGIC; 933 rjt_data.explan = ELS_EXPL_NONE; 934 goto reject_put; 935 } 936 937 fp = fc_frame_alloc(lport, sizeof(*flp)); 938 if (!fp) 939 goto out; 940 941 fc_flogi_fill(lport, fp); 942 flp = fc_frame_payload_get(fp, sizeof(*flp)); 943 flp->fl_cmd = ELS_LS_ACC; 944 945 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 946 lport->tt.frame_send(lport, fp); 947 948 /* 949 * Do not proceed with the state machine if our 950 * FLOGI has crossed with an FLOGI from the 951 * remote port; wait for the FLOGI response instead. 952 */ 953 if (rdata->rp_state != RPORT_ST_FLOGI) { 954 if (rdata->ids.port_name < lport->wwpn) 955 fc_rport_enter_plogi(rdata); 956 else 957 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); 958 } 959out: 960 mutex_unlock(&rdata->rp_mutex); 961 kref_put(&rdata->kref, fc_rport_destroy); 962 fc_frame_free(rx_fp); 963 return; 964 965reject_put: 966 kref_put(&rdata->kref, fc_rport_destroy); 967reject: 968 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); 969 fc_frame_free(rx_fp); 970} 971 972/** 973 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses 974 * @sp: The sequence the PLOGI is on 975 * @fp: The PLOGI response frame 976 * @rdata_arg: The remote port that sent the PLOGI response 977 * 978 * Locking Note: This function will be called without the rport lock 979 * held, but it will lock, call an _enter_* function or fc_rport_error 980 * and then unlock the rport. 981 */ 982static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, 983 void *rdata_arg) 984{ 985 struct fc_rport_priv *rdata = rdata_arg; 986 struct fc_lport *lport = rdata->local_port; 987 struct fc_els_flogi *plp = NULL; 988 u16 csp_seq; 989 u16 cssp_seq; 990 u8 op; 991 992 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); 993 994 if (fp == ERR_PTR(-FC_EX_CLOSED)) 995 goto put; 996 997 mutex_lock(&rdata->rp_mutex); 998 999 if (rdata->rp_state != RPORT_ST_PLOGI) { 1000 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " 1001 "%s\n", fc_rport_state(rdata)); 1002 if (IS_ERR(fp)) 1003 goto err; 1004 goto out; 1005 } 1006 1007 if (IS_ERR(fp)) { 1008 fc_rport_error_retry(rdata, PTR_ERR(fp)); 1009 goto err; 1010 } 1011 1012 op = fc_frame_payload_op(fp); 1013 if (op == ELS_LS_ACC && 1014 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { 1015 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); 1016 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); 1017 1018 /* save plogi response sp_features for further reference */ 1019 rdata->sp_features = ntohs(plp->fl_csp.sp_features); 1020 1021 if (lport->point_to_multipoint) 1022 fc_rport_login_complete(rdata, fp); 1023 csp_seq = ntohs(plp->fl_csp.sp_tot_seq); 1024 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); 1025 if (cssp_seq < csp_seq) 1026 csp_seq = cssp_seq; 1027 rdata->max_seq = csp_seq; 1028 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); 1029 fc_rport_enter_prli(rdata); 1030 } else { 1031 struct fc_els_ls_rjt *rjt; 1032 1033 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1034 if (!rjt) 1035 FC_RPORT_DBG(rdata, "PLOGI bad response\n"); 1036 else 1037 FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n", 1038 rjt->er_reason, rjt->er_explan); 1039 fc_rport_error_retry(rdata, -FC_EX_ELS_RJT); 1040 } 1041out: 1042 fc_frame_free(fp); 1043err: 1044 mutex_unlock(&rdata->rp_mutex); 1045put: 1046 kref_put(&rdata->kref, fc_rport_destroy); 1047} 1048 1049static bool 1050fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata) 1051{ 1052 if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN) 1053 return true; 1054 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) && 1055 (lport->service_params & FCP_SPPF_INIT_FCN)) 1056 return true; 1057 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) && 1058 (lport->service_params & FCP_SPPF_TARG_FCN)) 1059 return true; 1060 return false; 1061} 1062 1063/** 1064 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request 1065 * @rdata: The remote port to send a PLOGI to 1066 * 1067 * Reference counting: increments kref when sending ELS 1068 */ 1069static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) 1070{ 1071 struct fc_lport *lport = rdata->local_port; 1072 struct fc_frame *fp; 1073 1074 lockdep_assert_held(&rdata->rp_mutex); 1075 1076 if (!fc_rport_compatible_roles(lport, rdata)) { 1077 FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n"); 1078 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); 1079 return; 1080 } 1081 1082 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", 1083 fc_rport_state(rdata)); 1084 1085 fc_rport_state_enter(rdata, RPORT_ST_PLOGI); 1086 1087 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; 1088 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); 1089 if (!fp) { 1090 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__); 1091 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); 1092 return; 1093 } 1094 rdata->e_d_tov = lport->e_d_tov; 1095 1096 kref_get(&rdata->kref); 1097 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, 1098 fc_rport_plogi_resp, rdata, 1099 2 * lport->r_a_tov)) { 1100 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); 1101 kref_put(&rdata->kref, fc_rport_destroy); 1102 } 1103} 1104 1105/** 1106 * fc_rport_prli_resp() - Process Login (PRLI) response handler 1107 * @sp: The sequence the PRLI response was on 1108 * @fp: The PRLI response frame 1109 * @rdata_arg: The remote port that sent the PRLI response 1110 * 1111 * Locking Note: This function will be called without the rport lock 1112 * held, but it will lock, call an _enter_* function or fc_rport_error 1113 * and then unlock the rport. 1114 */ 1115static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, 1116 void *rdata_arg) 1117{ 1118 struct fc_rport_priv *rdata = rdata_arg; 1119 struct { 1120 struct fc_els_prli prli; 1121 struct fc_els_spp spp; 1122 } *pp; 1123 struct fc_els_spp temp_spp; 1124 struct fc_els_ls_rjt *rjt; 1125 struct fc4_prov *prov; 1126 u32 roles = FC_RPORT_ROLE_UNKNOWN; 1127 u32 fcp_parm = 0; 1128 u8 op; 1129 enum fc_els_spp_resp resp_code; 1130 1131 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); 1132 1133 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1134 goto put; 1135 1136 mutex_lock(&rdata->rp_mutex); 1137 1138 if (rdata->rp_state != RPORT_ST_PRLI) { 1139 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " 1140 "%s\n", fc_rport_state(rdata)); 1141 if (IS_ERR(fp)) 1142 goto err; 1143 goto out; 1144 } 1145 1146 if (IS_ERR(fp)) { 1147 fc_rport_error_retry(rdata, PTR_ERR(fp)); 1148 goto err; 1149 } 1150 1151 /* reinitialize remote port roles */ 1152 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 1153 1154 op = fc_frame_payload_op(fp); 1155 if (op == ELS_LS_ACC) { 1156 pp = fc_frame_payload_get(fp, sizeof(*pp)); 1157 if (!pp) { 1158 fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); 1159 goto out; 1160 } 1161 1162 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); 1163 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n", 1164 pp->spp.spp_flags, pp->spp.spp_type); 1165 1166 rdata->spp_type = pp->spp.spp_type; 1167 if (resp_code != FC_SPP_RESP_ACK) { 1168 if (resp_code == FC_SPP_RESP_CONF) 1169 fc_rport_error(rdata, -FC_EX_SEQ_ERR); 1170 else 1171 fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); 1172 goto out; 1173 } 1174 if (pp->prli.prli_spp_len < sizeof(pp->spp)) { 1175 fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); 1176 goto out; 1177 } 1178 1179 fcp_parm = ntohl(pp->spp.spp_params); 1180 if (fcp_parm & FCP_SPPF_RETRY) 1181 rdata->flags |= FC_RP_FLAGS_RETRY; 1182 if (fcp_parm & FCP_SPPF_CONF_COMPL) 1183 rdata->flags |= FC_RP_FLAGS_CONF_REQ; 1184 1185 /* 1186 * Call prli provider if we should act as a target 1187 */ 1188 if (rdata->spp_type < FC_FC4_PROV_SIZE) { 1189 prov = fc_passive_prov[rdata->spp_type]; 1190 if (prov) { 1191 memset(&temp_spp, 0, sizeof(temp_spp)); 1192 prov->prli(rdata, pp->prli.prli_spp_len, 1193 &pp->spp, &temp_spp); 1194 } 1195 } 1196 /* 1197 * Check if the image pair could be established 1198 */ 1199 if (rdata->spp_type != FC_TYPE_FCP || 1200 !(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) { 1201 /* 1202 * Nope; we can't use this port as a target. 1203 */ 1204 fcp_parm &= ~FCP_SPPF_TARG_FCN; 1205 } 1206 rdata->supported_classes = FC_COS_CLASS3; 1207 if (fcp_parm & FCP_SPPF_INIT_FCN) 1208 roles |= FC_RPORT_ROLE_FCP_INITIATOR; 1209 if (fcp_parm & FCP_SPPF_TARG_FCN) 1210 roles |= FC_RPORT_ROLE_FCP_TARGET; 1211 1212 rdata->ids.roles = roles; 1213 fc_rport_enter_rtv(rdata); 1214 1215 } else { 1216 rjt = fc_frame_payload_get(fp, sizeof(*rjt)); 1217 if (!rjt) 1218 FC_RPORT_DBG(rdata, "PRLI bad response\n"); 1219 else { 1220 FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n", 1221 rjt->er_reason, rjt->er_explan); 1222 if (rjt->er_reason == ELS_RJT_UNAB && 1223 rjt->er_explan == ELS_EXPL_PLOGI_REQD) { 1224 fc_rport_enter_plogi(rdata); 1225 goto out; 1226 } 1227 } 1228 fc_rport_error_retry(rdata, FC_EX_ELS_RJT); 1229 } 1230 1231out: 1232 fc_frame_free(fp); 1233err: 1234 mutex_unlock(&rdata->rp_mutex); 1235put: 1236 kref_put(&rdata->kref, fc_rport_destroy); 1237} 1238 1239/** 1240 * fc_rport_enter_prli() - Send Process Login (PRLI) request 1241 * @rdata: The remote port to send the PRLI request to 1242 * 1243 * Reference counting: increments kref when sending ELS 1244 */ 1245static void fc_rport_enter_prli(struct fc_rport_priv *rdata) 1246{ 1247 struct fc_lport *lport = rdata->local_port; 1248 struct { 1249 struct fc_els_prli prli; 1250 struct fc_els_spp spp; 1251 } *pp; 1252 struct fc_frame *fp; 1253 struct fc4_prov *prov; 1254 1255 lockdep_assert_held(&rdata->rp_mutex); 1256 1257 /* 1258 * If the rport is one of the well known addresses 1259 * we skip PRLI and RTV and go straight to READY. 1260 */ 1261 if (rdata->ids.port_id >= FC_FID_DOM_MGR) { 1262 fc_rport_enter_ready(rdata); 1263 return; 1264 } 1265 1266 /* 1267 * And if the local port does not support the initiator function 1268 * there's no need to send a PRLI, either. 1269 */ 1270 if (!(lport->service_params & FCP_SPPF_INIT_FCN)) { 1271 fc_rport_enter_ready(rdata); 1272 return; 1273 } 1274 1275 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", 1276 fc_rport_state(rdata)); 1277 1278 fc_rport_state_enter(rdata, RPORT_ST_PRLI); 1279 1280 fp = fc_frame_alloc(lport, sizeof(*pp)); 1281 if (!fp) { 1282 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); 1283 return; 1284 } 1285 1286 fc_prli_fill(lport, fp); 1287 1288 prov = fc_passive_prov[FC_TYPE_FCP]; 1289 if (prov) { 1290 pp = fc_frame_payload_get(fp, sizeof(*pp)); 1291 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp); 1292 } 1293 1294 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id, 1295 fc_host_port_id(lport->host), FC_TYPE_ELS, 1296 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 1297 1298 kref_get(&rdata->kref); 1299 if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp, 1300 NULL, rdata, 2 * lport->r_a_tov)) { 1301 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); 1302 kref_put(&rdata->kref, fc_rport_destroy); 1303 } 1304} 1305 1306/** 1307 * fc_rport_rtv_resp() - Handler for Request Timeout Value (RTV) responses 1308 * @sp: The sequence the RTV was on 1309 * @fp: The RTV response frame 1310 * @rdata_arg: The remote port that sent the RTV response 1311 * 1312 * Many targets don't seem to support this. 1313 * 1314 * Locking Note: This function will be called without the rport lock 1315 * held, but it will lock, call an _enter_* function or fc_rport_error 1316 * and then unlock the rport. 1317 */ 1318static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, 1319 void *rdata_arg) 1320{ 1321 struct fc_rport_priv *rdata = rdata_arg; 1322 u8 op; 1323 1324 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); 1325 1326 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1327 goto put; 1328 1329 mutex_lock(&rdata->rp_mutex); 1330 1331 if (rdata->rp_state != RPORT_ST_RTV) { 1332 FC_RPORT_DBG(rdata, "Received a RTV response, but in state " 1333 "%s\n", fc_rport_state(rdata)); 1334 if (IS_ERR(fp)) 1335 goto err; 1336 goto out; 1337 } 1338 1339 if (IS_ERR(fp)) { 1340 fc_rport_error(rdata, PTR_ERR(fp)); 1341 goto err; 1342 } 1343 1344 op = fc_frame_payload_op(fp); 1345 if (op == ELS_LS_ACC) { 1346 struct fc_els_rtv_acc *rtv; 1347 u32 toq; 1348 u32 tov; 1349 1350 rtv = fc_frame_payload_get(fp, sizeof(*rtv)); 1351 if (rtv) { 1352 toq = ntohl(rtv->rtv_toq); 1353 tov = ntohl(rtv->rtv_r_a_tov); 1354 if (tov == 0) 1355 tov = 1; 1356 if (tov > rdata->r_a_tov) 1357 rdata->r_a_tov = tov; 1358 tov = ntohl(rtv->rtv_e_d_tov); 1359 if (toq & FC_ELS_RTV_EDRES) 1360 tov /= 1000000; 1361 if (tov == 0) 1362 tov = 1; 1363 if (tov > rdata->e_d_tov) 1364 rdata->e_d_tov = tov; 1365 } 1366 } 1367 1368 fc_rport_enter_ready(rdata); 1369 1370out: 1371 fc_frame_free(fp); 1372err: 1373 mutex_unlock(&rdata->rp_mutex); 1374put: 1375 kref_put(&rdata->kref, fc_rport_destroy); 1376} 1377 1378/** 1379 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request 1380 * @rdata: The remote port to send the RTV request to 1381 * 1382 * Reference counting: increments kref when sending ELS 1383 */ 1384static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) 1385{ 1386 struct fc_frame *fp; 1387 struct fc_lport *lport = rdata->local_port; 1388 1389 lockdep_assert_held(&rdata->rp_mutex); 1390 1391 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", 1392 fc_rport_state(rdata)); 1393 1394 fc_rport_state_enter(rdata, RPORT_ST_RTV); 1395 1396 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); 1397 if (!fp) { 1398 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); 1399 return; 1400 } 1401 1402 kref_get(&rdata->kref); 1403 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, 1404 fc_rport_rtv_resp, rdata, 1405 2 * lport->r_a_tov)) { 1406 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); 1407 kref_put(&rdata->kref, fc_rport_destroy); 1408 } 1409} 1410 1411/** 1412 * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests 1413 * @rdata: The remote port that sent the RTV request 1414 * @in_fp: The RTV request frame 1415 */ 1416static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata, 1417 struct fc_frame *in_fp) 1418{ 1419 struct fc_lport *lport = rdata->local_port; 1420 struct fc_frame *fp; 1421 struct fc_els_rtv_acc *rtv; 1422 struct fc_seq_els_data rjt_data; 1423 1424 lockdep_assert_held(&rdata->rp_mutex); 1425 lockdep_assert_held(&lport->lp_mutex); 1426 1427 FC_RPORT_DBG(rdata, "Received RTV request\n"); 1428 1429 fp = fc_frame_alloc(lport, sizeof(*rtv)); 1430 if (!fp) { 1431 rjt_data.reason = ELS_RJT_UNAB; 1432 rjt_data.explan = ELS_EXPL_INSUF_RES; 1433 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); 1434 goto drop; 1435 } 1436 rtv = fc_frame_payload_get(fp, sizeof(*rtv)); 1437 rtv->rtv_cmd = ELS_LS_ACC; 1438 rtv->rtv_r_a_tov = htonl(lport->r_a_tov); 1439 rtv->rtv_e_d_tov = htonl(lport->e_d_tov); 1440 rtv->rtv_toq = 0; 1441 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); 1442 lport->tt.frame_send(lport, fp); 1443drop: 1444 fc_frame_free(in_fp); 1445} 1446 1447/** 1448 * fc_rport_logo_resp() - Handler for logout (LOGO) responses 1449 * @sp: The sequence the LOGO was on 1450 * @fp: The LOGO response frame 1451 * @rdata_arg: The remote port 1452 */ 1453static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, 1454 void *rdata_arg) 1455{ 1456 struct fc_rport_priv *rdata = rdata_arg; 1457 struct fc_lport *lport = rdata->local_port; 1458 1459 FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did, 1460 "Received a LOGO %s\n", fc_els_resp_type(fp)); 1461 if (!IS_ERR(fp)) 1462 fc_frame_free(fp); 1463 kref_put(&rdata->kref, fc_rport_destroy); 1464} 1465 1466/** 1467 * fc_rport_enter_logo() - Send a logout (LOGO) request 1468 * @rdata: The remote port to send the LOGO request to 1469 * 1470 * Reference counting: increments kref when sending ELS 1471 */ 1472static void fc_rport_enter_logo(struct fc_rport_priv *rdata) 1473{ 1474 struct fc_lport *lport = rdata->local_port; 1475 struct fc_frame *fp; 1476 1477 lockdep_assert_held(&rdata->rp_mutex); 1478 1479 FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n", 1480 fc_rport_state(rdata)); 1481 1482 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); 1483 if (!fp) 1484 return; 1485 kref_get(&rdata->kref); 1486 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, 1487 fc_rport_logo_resp, rdata, 0)) 1488 kref_put(&rdata->kref, fc_rport_destroy); 1489} 1490 1491/** 1492 * fc_rport_adisc_resp() - Handler for Address Discovery (ADISC) responses 1493 * @sp: The sequence the ADISC response was on 1494 * @fp: The ADISC response frame 1495 * @rdata_arg: The remote port that sent the ADISC response 1496 * 1497 * Locking Note: This function will be called without the rport lock 1498 * held, but it will lock, call an _enter_* function or fc_rport_error 1499 * and then unlock the rport. 1500 */ 1501static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, 1502 void *rdata_arg) 1503{ 1504 struct fc_rport_priv *rdata = rdata_arg; 1505 struct fc_els_adisc *adisc; 1506 u8 op; 1507 1508 FC_RPORT_DBG(rdata, "Received a ADISC response\n"); 1509 1510 if (fp == ERR_PTR(-FC_EX_CLOSED)) 1511 goto put; 1512 1513 mutex_lock(&rdata->rp_mutex); 1514 1515 if (rdata->rp_state != RPORT_ST_ADISC) { 1516 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", 1517 fc_rport_state(rdata)); 1518 if (IS_ERR(fp)) 1519 goto err; 1520 goto out; 1521 } 1522 1523 if (IS_ERR(fp)) { 1524 fc_rport_error(rdata, PTR_ERR(fp)); 1525 goto err; 1526 } 1527 1528 /* 1529 * If address verification failed. Consider us logged out of the rport. 1530 * Since the rport is still in discovery, we want to be 1531 * logged in, so go to PLOGI state. Otherwise, go back to READY. 1532 */ 1533 op = fc_frame_payload_op(fp); 1534 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1535 if (op != ELS_LS_ACC || !adisc || 1536 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || 1537 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || 1538 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { 1539 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); 1540 fc_rport_enter_flogi(rdata); 1541 } else { 1542 FC_RPORT_DBG(rdata, "ADISC OK\n"); 1543 fc_rport_enter_ready(rdata); 1544 } 1545out: 1546 fc_frame_free(fp); 1547err: 1548 mutex_unlock(&rdata->rp_mutex); 1549put: 1550 kref_put(&rdata->kref, fc_rport_destroy); 1551} 1552 1553/** 1554 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request 1555 * @rdata: The remote port to send the ADISC request to 1556 * 1557 * Reference counting: increments kref when sending ELS 1558 */ 1559static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) 1560{ 1561 struct fc_lport *lport = rdata->local_port; 1562 struct fc_frame *fp; 1563 1564 lockdep_assert_held(&rdata->rp_mutex); 1565 1566 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", 1567 fc_rport_state(rdata)); 1568 1569 fc_rport_state_enter(rdata, RPORT_ST_ADISC); 1570 1571 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); 1572 if (!fp) { 1573 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); 1574 return; 1575 } 1576 kref_get(&rdata->kref); 1577 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, 1578 fc_rport_adisc_resp, rdata, 1579 2 * lport->r_a_tov)) { 1580 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); 1581 kref_put(&rdata->kref, fc_rport_destroy); 1582 } 1583} 1584 1585/** 1586 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests 1587 * @rdata: The remote port that sent the ADISC request 1588 * @in_fp: The ADISC request frame 1589 */ 1590static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, 1591 struct fc_frame *in_fp) 1592{ 1593 struct fc_lport *lport = rdata->local_port; 1594 struct fc_frame *fp; 1595 struct fc_els_adisc *adisc; 1596 struct fc_seq_els_data rjt_data; 1597 1598 lockdep_assert_held(&rdata->rp_mutex); 1599 lockdep_assert_held(&lport->lp_mutex); 1600 1601 FC_RPORT_DBG(rdata, "Received ADISC request\n"); 1602 1603 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); 1604 if (!adisc) { 1605 rjt_data.reason = ELS_RJT_PROT; 1606 rjt_data.explan = ELS_EXPL_INV_LEN; 1607 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); 1608 goto drop; 1609 } 1610 1611 fp = fc_frame_alloc(lport, sizeof(*adisc)); 1612 if (!fp) 1613 goto drop; 1614 fc_adisc_fill(lport, fp); 1615 adisc = fc_frame_payload_get(fp, sizeof(*adisc)); 1616 adisc->adisc_cmd = ELS_LS_ACC; 1617 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); 1618 lport->tt.frame_send(lport, fp); 1619drop: 1620 fc_frame_free(in_fp); 1621} 1622 1623/** 1624 * fc_rport_recv_rls_req() - Handle received Read Link Status request 1625 * @rdata: The remote port that sent the RLS request 1626 * @rx_fp: The PRLI request frame 1627 */ 1628static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, 1629 struct fc_frame *rx_fp) 1630 1631{ 1632 struct fc_lport *lport = rdata->local_port; 1633 struct fc_frame *fp; 1634 struct fc_els_rls *rls; 1635 struct fc_els_rls_resp *rsp; 1636 struct fc_els_lesb *lesb; 1637 struct fc_seq_els_data rjt_data; 1638 struct fc_host_statistics *hst; 1639 1640 lockdep_assert_held(&rdata->rp_mutex); 1641 1642 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", 1643 fc_rport_state(rdata)); 1644 1645 rls = fc_frame_payload_get(rx_fp, sizeof(*rls)); 1646 if (!rls) { 1647 rjt_data.reason = ELS_RJT_PROT; 1648 rjt_data.explan = ELS_EXPL_INV_LEN; 1649 goto out_rjt; 1650 } 1651 1652 fp = fc_frame_alloc(lport, sizeof(*rsp)); 1653 if (!fp) { 1654 rjt_data.reason = ELS_RJT_UNAB; 1655 rjt_data.explan = ELS_EXPL_INSUF_RES; 1656 goto out_rjt; 1657 } 1658 1659 rsp = fc_frame_payload_get(fp, sizeof(*rsp)); 1660 memset(rsp, 0, sizeof(*rsp)); 1661 rsp->rls_cmd = ELS_LS_ACC; 1662 lesb = &rsp->rls_lesb; 1663 if (lport->tt.get_lesb) { 1664 /* get LESB from LLD if it supports it */ 1665 lport->tt.get_lesb(lport, lesb); 1666 } else { 1667 fc_get_host_stats(lport->host); 1668 hst = &lport->host_stats; 1669 lesb->lesb_link_fail = htonl(hst->link_failure_count); 1670 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count); 1671 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count); 1672 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count); 1673 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count); 1674 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count); 1675 } 1676 1677 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 1678 lport->tt.frame_send(lport, fp); 1679 goto out; 1680 1681out_rjt: 1682 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); 1683out: 1684 fc_frame_free(rx_fp); 1685} 1686 1687/** 1688 * fc_rport_recv_els_req() - Handler for validated ELS requests 1689 * @lport: The local port that received the ELS request 1690 * @fp: The ELS request frame 1691 * 1692 * Handle incoming ELS requests that require port login. 1693 * The ELS opcode has already been validated by the caller. 1694 * 1695 * Reference counting: does not modify kref 1696 */ 1697static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) 1698{ 1699 struct fc_rport_priv *rdata; 1700 struct fc_seq_els_data els_data; 1701 1702 lockdep_assert_held(&lport->lp_mutex); 1703 1704 rdata = fc_rport_lookup(lport, fc_frame_sid(fp)); 1705 if (!rdata) { 1706 FC_RPORT_ID_DBG(lport, fc_frame_sid(fp), 1707 "Received ELS 0x%02x from non-logged-in port\n", 1708 fc_frame_payload_op(fp)); 1709 goto reject; 1710 } 1711 1712 mutex_lock(&rdata->rp_mutex); 1713 1714 switch (rdata->rp_state) { 1715 case RPORT_ST_PRLI: 1716 case RPORT_ST_RTV: 1717 case RPORT_ST_READY: 1718 case RPORT_ST_ADISC: 1719 break; 1720 case RPORT_ST_PLOGI: 1721 if (fc_frame_payload_op(fp) == ELS_PRLI) { 1722 FC_RPORT_DBG(rdata, "Reject ELS PRLI " 1723 "while in state %s\n", 1724 fc_rport_state(rdata)); 1725 mutex_unlock(&rdata->rp_mutex); 1726 kref_put(&rdata->kref, fc_rport_destroy); 1727 goto busy; 1728 } 1729 fallthrough; 1730 default: 1731 FC_RPORT_DBG(rdata, 1732 "Reject ELS 0x%02x while in state %s\n", 1733 fc_frame_payload_op(fp), fc_rport_state(rdata)); 1734 mutex_unlock(&rdata->rp_mutex); 1735 kref_put(&rdata->kref, fc_rport_destroy); 1736 goto reject; 1737 } 1738 1739 switch (fc_frame_payload_op(fp)) { 1740 case ELS_PRLI: 1741 fc_rport_recv_prli_req(rdata, fp); 1742 break; 1743 case ELS_PRLO: 1744 fc_rport_recv_prlo_req(rdata, fp); 1745 break; 1746 case ELS_ADISC: 1747 fc_rport_recv_adisc_req(rdata, fp); 1748 break; 1749 case ELS_RRQ: 1750 fc_seq_els_rsp_send(fp, ELS_RRQ, NULL); 1751 fc_frame_free(fp); 1752 break; 1753 case ELS_REC: 1754 fc_seq_els_rsp_send(fp, ELS_REC, NULL); 1755 fc_frame_free(fp); 1756 break; 1757 case ELS_RLS: 1758 fc_rport_recv_rls_req(rdata, fp); 1759 break; 1760 case ELS_RTV: 1761 fc_rport_recv_rtv_req(rdata, fp); 1762 break; 1763 default: 1764 fc_frame_free(fp); /* can't happen */ 1765 break; 1766 } 1767 1768 mutex_unlock(&rdata->rp_mutex); 1769 kref_put(&rdata->kref, fc_rport_destroy); 1770 return; 1771 1772reject: 1773 els_data.reason = ELS_RJT_UNAB; 1774 els_data.explan = ELS_EXPL_PLOGI_REQD; 1775 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); 1776 fc_frame_free(fp); 1777 return; 1778 1779busy: 1780 els_data.reason = ELS_RJT_BUSY; 1781 els_data.explan = ELS_EXPL_NONE; 1782 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); 1783 fc_frame_free(fp); 1784 return; 1785} 1786 1787/** 1788 * fc_rport_recv_req() - Handler for requests 1789 * @lport: The local port that received the request 1790 * @fp: The request frame 1791 * 1792 * Reference counting: does not modify kref 1793 */ 1794void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp) 1795{ 1796 struct fc_seq_els_data els_data; 1797 1798 lockdep_assert_held(&lport->lp_mutex); 1799 1800 /* 1801 * Handle FLOGI, PLOGI and LOGO requests separately, since they 1802 * don't require prior login. 1803 * Check for unsupported opcodes first and reject them. 1804 * For some ops, it would be incorrect to reject with "PLOGI required". 1805 */ 1806 switch (fc_frame_payload_op(fp)) { 1807 case ELS_FLOGI: 1808 fc_rport_recv_flogi_req(lport, fp); 1809 break; 1810 case ELS_PLOGI: 1811 fc_rport_recv_plogi_req(lport, fp); 1812 break; 1813 case ELS_LOGO: 1814 fc_rport_recv_logo_req(lport, fp); 1815 break; 1816 case ELS_PRLI: 1817 case ELS_PRLO: 1818 case ELS_ADISC: 1819 case ELS_RRQ: 1820 case ELS_REC: 1821 case ELS_RLS: 1822 case ELS_RTV: 1823 fc_rport_recv_els_req(lport, fp); 1824 break; 1825 default: 1826 els_data.reason = ELS_RJT_UNSUP; 1827 els_data.explan = ELS_EXPL_NONE; 1828 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); 1829 fc_frame_free(fp); 1830 break; 1831 } 1832} 1833EXPORT_SYMBOL(fc_rport_recv_req); 1834 1835/** 1836 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests 1837 * @lport: The local port that received the PLOGI request 1838 * @rx_fp: The PLOGI request frame 1839 * 1840 * Reference counting: increments kref on return 1841 */ 1842static void fc_rport_recv_plogi_req(struct fc_lport *lport, 1843 struct fc_frame *rx_fp) 1844{ 1845 struct fc_disc *disc; 1846 struct fc_rport_priv *rdata; 1847 struct fc_frame *fp = rx_fp; 1848 struct fc_els_flogi *pl; 1849 struct fc_seq_els_data rjt_data; 1850 u32 sid; 1851 1852 lockdep_assert_held(&lport->lp_mutex); 1853 1854 sid = fc_frame_sid(fp); 1855 1856 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); 1857 1858 pl = fc_frame_payload_get(fp, sizeof(*pl)); 1859 if (!pl) { 1860 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); 1861 rjt_data.reason = ELS_RJT_PROT; 1862 rjt_data.explan = ELS_EXPL_INV_LEN; 1863 goto reject; 1864 } 1865 1866 disc = &lport->disc; 1867 mutex_lock(&disc->disc_mutex); 1868 rdata = fc_rport_create(lport, sid); 1869 if (!rdata) { 1870 mutex_unlock(&disc->disc_mutex); 1871 rjt_data.reason = ELS_RJT_UNAB; 1872 rjt_data.explan = ELS_EXPL_INSUF_RES; 1873 goto reject; 1874 } 1875 1876 mutex_lock(&rdata->rp_mutex); 1877 mutex_unlock(&disc->disc_mutex); 1878 1879 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); 1880 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); 1881 1882 /* 1883 * If the rport was just created, possibly due to the incoming PLOGI, 1884 * set the state appropriately and accept the PLOGI. 1885 * 1886 * If we had also sent a PLOGI, and if the received PLOGI is from a 1887 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason 1888 * "command already in progress". 1889 * 1890 * XXX TBD: If the session was ready before, the PLOGI should result in 1891 * all outstanding exchanges being reset. 1892 */ 1893 switch (rdata->rp_state) { 1894 case RPORT_ST_INIT: 1895 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); 1896 break; 1897 case RPORT_ST_PLOGI_WAIT: 1898 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n"); 1899 break; 1900 case RPORT_ST_PLOGI: 1901 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); 1902 if (rdata->ids.port_name < lport->wwpn) { 1903 mutex_unlock(&rdata->rp_mutex); 1904 rjt_data.reason = ELS_RJT_INPROG; 1905 rjt_data.explan = ELS_EXPL_NONE; 1906 goto reject; 1907 } 1908 break; 1909 case RPORT_ST_PRLI: 1910 case RPORT_ST_RTV: 1911 case RPORT_ST_READY: 1912 case RPORT_ST_ADISC: 1913 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " 1914 "- ignored for now\n", rdata->rp_state); 1915 /* XXX TBD - should reset */ 1916 break; 1917 case RPORT_ST_FLOGI: 1918 case RPORT_ST_DELETE: 1919 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", 1920 fc_rport_state(rdata)); 1921 mutex_unlock(&rdata->rp_mutex); 1922 rjt_data.reason = ELS_RJT_BUSY; 1923 rjt_data.explan = ELS_EXPL_NONE; 1924 goto reject; 1925 } 1926 if (!fc_rport_compatible_roles(lport, rdata)) { 1927 FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n"); 1928 mutex_unlock(&rdata->rp_mutex); 1929 rjt_data.reason = ELS_RJT_LOGIC; 1930 rjt_data.explan = ELS_EXPL_NONE; 1931 goto reject; 1932 } 1933 1934 /* 1935 * Get session payload size from incoming PLOGI. 1936 */ 1937 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); 1938 1939 /* 1940 * Send LS_ACC. If this fails, the originator should retry. 1941 */ 1942 fp = fc_frame_alloc(lport, sizeof(*pl)); 1943 if (!fp) 1944 goto out; 1945 1946 fc_plogi_fill(lport, fp, ELS_LS_ACC); 1947 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 1948 lport->tt.frame_send(lport, fp); 1949 fc_rport_enter_prli(rdata); 1950out: 1951 mutex_unlock(&rdata->rp_mutex); 1952 fc_frame_free(rx_fp); 1953 return; 1954 1955reject: 1956 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); 1957 fc_frame_free(fp); 1958} 1959 1960/** 1961 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests 1962 * @rdata: The remote port that sent the PRLI request 1963 * @rx_fp: The PRLI request frame 1964 */ 1965static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, 1966 struct fc_frame *rx_fp) 1967{ 1968 struct fc_lport *lport = rdata->local_port; 1969 struct fc_frame *fp; 1970 struct { 1971 struct fc_els_prli prli; 1972 struct fc_els_spp spp; 1973 } *pp; 1974 struct fc_els_spp *rspp; /* request service param page */ 1975 struct fc_els_spp *spp; /* response spp */ 1976 unsigned int len; 1977 unsigned int plen; 1978 enum fc_els_spp_resp resp; 1979 struct fc_seq_els_data rjt_data; 1980 struct fc4_prov *prov; 1981 1982 lockdep_assert_held(&rdata->rp_mutex); 1983 1984 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", 1985 fc_rport_state(rdata)); 1986 1987 len = fr_len(rx_fp) - sizeof(struct fc_frame_header); 1988 pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); 1989 if (!pp) 1990 goto reject_len; 1991 plen = ntohs(pp->prli.prli_len); 1992 if ((plen % 4) != 0 || plen > len || plen < 16) 1993 goto reject_len; 1994 if (plen < len) 1995 len = plen; 1996 plen = pp->prli.prli_spp_len; 1997 if ((plen % 4) != 0 || plen < sizeof(*spp) || 1998 plen > len || len < sizeof(*pp) || plen < 12) 1999 goto reject_len; 2000 rspp = &pp->spp; 2001 2002 fp = fc_frame_alloc(lport, len); 2003 if (!fp) { 2004 rjt_data.reason = ELS_RJT_UNAB; 2005 rjt_data.explan = ELS_EXPL_INSUF_RES; 2006 goto reject; 2007 } 2008 pp = fc_frame_payload_get(fp, len); 2009 WARN_ON(!pp); 2010 memset(pp, 0, len); 2011 pp->prli.prli_cmd = ELS_LS_ACC; 2012 pp->prli.prli_spp_len = plen; 2013 pp->prli.prli_len = htons(len); 2014 len -= sizeof(struct fc_els_prli); 2015 2016 /* 2017 * Go through all the service parameter pages and build 2018 * response. If plen indicates longer SPP than standard, 2019 * use that. The entire response has been pre-cleared above. 2020 */ 2021 spp = &pp->spp; 2022 mutex_lock(&fc_prov_mutex); 2023 while (len >= plen) { 2024 rdata->spp_type = rspp->spp_type; 2025 spp->spp_type = rspp->spp_type; 2026 spp->spp_type_ext = rspp->spp_type_ext; 2027 resp = 0; 2028 2029 if (rspp->spp_type < FC_FC4_PROV_SIZE) { 2030 enum fc_els_spp_resp active = 0, passive = 0; 2031 2032 prov = fc_active_prov[rspp->spp_type]; 2033 if (prov) 2034 active = prov->prli(rdata, plen, rspp, spp); 2035 prov = fc_passive_prov[rspp->spp_type]; 2036 if (prov) 2037 passive = prov->prli(rdata, plen, rspp, spp); 2038 if (!active || passive == FC_SPP_RESP_ACK) 2039 resp = passive; 2040 else 2041 resp = active; 2042 FC_RPORT_DBG(rdata, "PRLI rspp type %x " 2043 "active %x passive %x\n", 2044 rspp->spp_type, active, passive); 2045 } 2046 if (!resp) { 2047 if (spp->spp_flags & FC_SPP_EST_IMG_PAIR) 2048 resp |= FC_SPP_RESP_CONF; 2049 else 2050 resp |= FC_SPP_RESP_INVL; 2051 } 2052 spp->spp_flags |= resp; 2053 len -= plen; 2054 rspp = (struct fc_els_spp *)((char *)rspp + plen); 2055 spp = (struct fc_els_spp *)((char *)spp + plen); 2056 } 2057 mutex_unlock(&fc_prov_mutex); 2058 2059 /* 2060 * Send LS_ACC. If this fails, the originator should retry. 2061 */ 2062 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 2063 lport->tt.frame_send(lport, fp); 2064 2065 goto drop; 2066 2067reject_len: 2068 rjt_data.reason = ELS_RJT_PROT; 2069 rjt_data.explan = ELS_EXPL_INV_LEN; 2070reject: 2071 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); 2072drop: 2073 fc_frame_free(rx_fp); 2074} 2075 2076/** 2077 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests 2078 * @rdata: The remote port that sent the PRLO request 2079 * @rx_fp: The PRLO request frame 2080 */ 2081static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, 2082 struct fc_frame *rx_fp) 2083{ 2084 struct fc_lport *lport = rdata->local_port; 2085 struct fc_frame *fp; 2086 struct { 2087 struct fc_els_prlo prlo; 2088 struct fc_els_spp spp; 2089 } *pp; 2090 struct fc_els_spp *rspp; /* request service param page */ 2091 struct fc_els_spp *spp; /* response spp */ 2092 unsigned int len; 2093 unsigned int plen; 2094 struct fc_seq_els_data rjt_data; 2095 2096 lockdep_assert_held(&rdata->rp_mutex); 2097 2098 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", 2099 fc_rport_state(rdata)); 2100 2101 len = fr_len(rx_fp) - sizeof(struct fc_frame_header); 2102 pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); 2103 if (!pp) 2104 goto reject_len; 2105 plen = ntohs(pp->prlo.prlo_len); 2106 if (plen != 20) 2107 goto reject_len; 2108 if (plen < len) 2109 len = plen; 2110 2111 rspp = &pp->spp; 2112 2113 fp = fc_frame_alloc(lport, len); 2114 if (!fp) { 2115 rjt_data.reason = ELS_RJT_UNAB; 2116 rjt_data.explan = ELS_EXPL_INSUF_RES; 2117 goto reject; 2118 } 2119 2120 pp = fc_frame_payload_get(fp, len); 2121 WARN_ON(!pp); 2122 memset(pp, 0, len); 2123 pp->prlo.prlo_cmd = ELS_LS_ACC; 2124 pp->prlo.prlo_obs = 0x10; 2125 pp->prlo.prlo_len = htons(len); 2126 spp = &pp->spp; 2127 spp->spp_type = rspp->spp_type; 2128 spp->spp_type_ext = rspp->spp_type_ext; 2129 spp->spp_flags = FC_SPP_RESP_ACK; 2130 2131 fc_rport_enter_prli(rdata); 2132 2133 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); 2134 lport->tt.frame_send(lport, fp); 2135 goto drop; 2136 2137reject_len: 2138 rjt_data.reason = ELS_RJT_PROT; 2139 rjt_data.explan = ELS_EXPL_INV_LEN; 2140reject: 2141 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); 2142drop: 2143 fc_frame_free(rx_fp); 2144} 2145 2146/** 2147 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests 2148 * @lport: The local port that received the LOGO request 2149 * @fp: The LOGO request frame 2150 * 2151 * Reference counting: drops kref on return 2152 */ 2153static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) 2154{ 2155 struct fc_rport_priv *rdata; 2156 u32 sid; 2157 2158 lockdep_assert_held(&lport->lp_mutex); 2159 2160 fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 2161 2162 sid = fc_frame_sid(fp); 2163 2164 rdata = fc_rport_lookup(lport, sid); 2165 if (rdata) { 2166 mutex_lock(&rdata->rp_mutex); 2167 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", 2168 fc_rport_state(rdata)); 2169 2170 fc_rport_enter_delete(rdata, RPORT_EV_STOP); 2171 mutex_unlock(&rdata->rp_mutex); 2172 kref_put(&rdata->kref, fc_rport_destroy); 2173 } else 2174 FC_RPORT_ID_DBG(lport, sid, 2175 "Received LOGO from non-logged-in port\n"); 2176 fc_frame_free(fp); 2177} 2178 2179/** 2180 * fc_rport_flush_queue() - Flush the rport_event_queue 2181 */ 2182void fc_rport_flush_queue(void) 2183{ 2184 flush_workqueue(rport_event_queue); 2185} 2186EXPORT_SYMBOL(fc_rport_flush_queue); 2187 2188/** 2189 * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator. 2190 * @rdata: remote port private 2191 * @spp_len: service parameter page length 2192 * @rspp: received service parameter page 2193 * @spp: response service parameter page 2194 * 2195 * Returns the value for the response code to be placed in spp_flags; 2196 * Returns 0 if not an initiator. 2197 */ 2198static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len, 2199 const struct fc_els_spp *rspp, 2200 struct fc_els_spp *spp) 2201{ 2202 struct fc_lport *lport = rdata->local_port; 2203 u32 fcp_parm; 2204 2205 fcp_parm = ntohl(rspp->spp_params); 2206 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; 2207 if (fcp_parm & FCP_SPPF_INIT_FCN) 2208 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR; 2209 if (fcp_parm & FCP_SPPF_TARG_FCN) 2210 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET; 2211 if (fcp_parm & FCP_SPPF_RETRY) 2212 rdata->flags |= FC_RP_FLAGS_RETRY; 2213 rdata->supported_classes = FC_COS_CLASS3; 2214 2215 if (!(lport->service_params & FCP_SPPF_INIT_FCN)) 2216 return 0; 2217 2218 spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR; 2219 2220 /* 2221 * OR in our service parameters with other providers (target), if any. 2222 */ 2223 fcp_parm = ntohl(spp->spp_params); 2224 spp->spp_params = htonl(fcp_parm | lport->service_params); 2225 return FC_SPP_RESP_ACK; 2226} 2227 2228/* 2229 * FC-4 provider ops for FCP initiator. 2230 */ 2231struct fc4_prov fc_rport_fcp_init = { 2232 .prli = fc_rport_fcp_prli, 2233}; 2234 2235/** 2236 * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0 2237 * @rdata: remote port private 2238 * @spp_len: service parameter page length 2239 * @rspp: received service parameter page 2240 * @spp: response service parameter page 2241 */ 2242static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len, 2243 const struct fc_els_spp *rspp, 2244 struct fc_els_spp *spp) 2245{ 2246 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) 2247 return FC_SPP_RESP_INVL; 2248 return FC_SPP_RESP_ACK; 2249} 2250 2251/* 2252 * FC-4 provider ops for type 0 service parameters. 2253 * 2254 * This handles the special case of type 0 which is always successful 2255 * but doesn't do anything otherwise. 2256 */ 2257struct fc4_prov fc_rport_t0_prov = { 2258 .prli = fc_rport_t0_prli, 2259}; 2260 2261/** 2262 * fc_setup_rport() - Initialize the rport_event_queue 2263 */ 2264int fc_setup_rport(void) 2265{ 2266 rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); 2267 if (!rport_event_queue) 2268 return -ENOMEM; 2269 return 0; 2270} 2271 2272/** 2273 * fc_destroy_rport() - Destroy the rport_event_queue 2274 */ 2275void fc_destroy_rport(void) 2276{ 2277 destroy_workqueue(rport_event_queue); 2278} 2279 2280/** 2281 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port 2282 * @rport: The remote port whose I/O should be terminated 2283 */ 2284void fc_rport_terminate_io(struct fc_rport *rport) 2285{ 2286 struct fc_rport_libfc_priv *rpriv = rport->dd_data; 2287 struct fc_lport *lport = rpriv->local_port; 2288 2289 lport->tt.exch_mgr_reset(lport, 0, rport->port_id); 2290 lport->tt.exch_mgr_reset(lport, rport->port_id, 0); 2291} 2292EXPORT_SYMBOL(fc_rport_terminate_io); 2293