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