drivers/scsi/libfc/fc_rport.c

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