drivers/scsi/libfc/fc_rport.c

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