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_els_flogi *flp;
 864         struct fc_rport_priv *rdata;
 865         struct fc_frame *fp = rx_fp;
 866         struct fc_seq_els_data rjt_data;
 867         u32 sid;
 868
 869         sid = fc_frame_sid(fp);
 870
 871         FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
 872
 873         if (!lport->point_to_multipoint) {
 874                 rjt_data.reason = ELS_RJT_UNSUP;
 875                 rjt_data.explan = ELS_EXPL_NONE;
 876                 goto reject;
 877         }
 878
 879         flp = fc_frame_payload_get(fp, sizeof(*flp));
 880         if (!flp) {
 881                 rjt_data.reason = ELS_RJT_LOGIC;
 882                 rjt_data.explan = ELS_EXPL_INV_LEN;
 883                 goto reject;
 884         }
 885
 886         rdata = fc_rport_lookup(lport, sid);
 887         if (!rdata) {
 888                 rjt_data.reason = ELS_RJT_FIP;
 889                 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
 890                 goto reject;
 891         }
 892         mutex_lock(&rdata->rp_mutex);
 893
 894         FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
 895                      fc_rport_state(rdata));
 896
 897         switch (rdata->rp_state) {
 898         case RPORT_ST_INIT:
 899                 /*
 900                  * If received the FLOGI request on RPORT which is INIT state
 901                  * (means not transition to FLOGI either fc_rport timeout
 902                  * function didn;t trigger or this end hasn;t received
 903                  * beacon yet from other end. In that case only, allow RPORT
 904                  * state machine to continue, otherwise fall through which
 905                  * causes the code to send reject response.
 906                  * NOTE; Not checking for FIP->state such as VNMP_UP or
 907                  * VNMP_CLAIM because if FIP state is not one of those,
 908                  * RPORT wouldn;t have created and 'rport_lookup' would have
 909                  * failed anyway in that case.
 910                  */
 911                 break;
 912         case RPORT_ST_DELETE:
 913                 mutex_unlock(&rdata->rp_mutex);
 914                 rjt_data.reason = ELS_RJT_FIP;
 915                 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
 916                 goto reject_put;
 917         case RPORT_ST_FLOGI:
 918         case RPORT_ST_PLOGI_WAIT:
 919         case RPORT_ST_PLOGI:
 920                 break;
 921         case RPORT_ST_PRLI:
 922         case RPORT_ST_RTV:
 923         case RPORT_ST_READY:
 924         case RPORT_ST_ADISC:
 925                 /*
 926                  * Set the remote port to be deleted and to then restart.
 927                  * This queues work to be sure exchanges are reset.
 928                  */
 929                 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
 930                 mutex_unlock(&rdata->rp_mutex);
 931                 rjt_data.reason = ELS_RJT_BUSY;
 932                 rjt_data.explan = ELS_EXPL_NONE;
 933                 goto reject_put;
 934         }
 935         if (fc_rport_login_complete(rdata, fp)) {
 936                 mutex_unlock(&rdata->rp_mutex);
 937                 rjt_data.reason = ELS_RJT_LOGIC;
 938                 rjt_data.explan = ELS_EXPL_NONE;
 939                 goto reject_put;
 940         }
 941
 942         fp = fc_frame_alloc(lport, sizeof(*flp));
 943         if (!fp)
 944                 goto out;
 945
 946         fc_flogi_fill(lport, fp);
 947         flp = fc_frame_payload_get(fp, sizeof(*flp));
 948         flp->fl_cmd = ELS_LS_ACC;
 949
 950         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
 951         lport->tt.frame_send(lport, fp);
 952
 953         /*
 954          * Do not proceed with the state machine if our
 955          * FLOGI has crossed with an FLOGI from the
 956          * remote port; wait for the FLOGI response instead.
 957          */
 958         if (rdata->rp_state != RPORT_ST_FLOGI) {
 959                 if (rdata->ids.port_name < lport->wwpn)
 960                         fc_rport_enter_plogi(rdata);
 961                 else
 962                         fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
 963         }
 964 out:
 965         mutex_unlock(&rdata->rp_mutex);
 966         kref_put(&rdata->kref, fc_rport_destroy);
 967         fc_frame_free(rx_fp);
 968         return;
 969
 970 reject_put:
 971         kref_put(&rdata->kref, fc_rport_destroy);
 972 reject:
 973         fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
 974         fc_frame_free(rx_fp);
 975 }
 976
 977 /**
 978  * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
 979  * @sp:        The sequence the PLOGI is on
 980  * @fp:        The PLOGI response frame
 981  * @rdata_arg: The remote port that sent the PLOGI response
 982  *
 983  * Locking Note: This function will be called without the rport lock
 984  * held, but it will lock, call an _enter_* function or fc_rport_error
 985  * and then unlock the rport.
 986  */
 987 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
 988                                 void *rdata_arg)
 989 {
 990         struct fc_rport_priv *rdata = rdata_arg;
 991         struct fc_lport *lport = rdata->local_port;
 992         struct fc_els_flogi *plp = NULL;
 993         u16 csp_seq;
 994         u16 cssp_seq;
 995         u8 op;
 996
 997         FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
 998
 999         if (fp == ERR_PTR(-FC_EX_CLOSED))
1000                 goto put;
1001
1002         mutex_lock(&rdata->rp_mutex);
1003
1004         if (rdata->rp_state != RPORT_ST_PLOGI) {
1005                 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
1006                              "%s\n", fc_rport_state(rdata));
1007                 if (IS_ERR(fp))
1008                         goto err;
1009                 goto out;
1010         }
1011
1012         if (IS_ERR(fp)) {
1013                 fc_rport_error_retry(rdata, PTR_ERR(fp));
1014                 goto err;
1015         }
1016
1017         op = fc_frame_payload_op(fp);
1018         if (op == ELS_LS_ACC &&
1019             (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
1020                 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
1021                 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
1022
1023                 /* save plogi response sp_features for further reference */
1024                 rdata->sp_features = ntohs(plp->fl_csp.sp_features);
1025
1026                 if (lport->point_to_multipoint)
1027                         fc_rport_login_complete(rdata, fp);
1028                 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
1029                 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
1030                 if (cssp_seq < csp_seq)
1031                         csp_seq = cssp_seq;
1032                 rdata->max_seq = csp_seq;
1033                 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
1034                 fc_rport_enter_prli(rdata);
1035         } else {
1036                 struct fc_els_ls_rjt *rjt;
1037
1038                 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1039                 if (!rjt)
1040                         FC_RPORT_DBG(rdata, "PLOGI bad response\n");
1041                 else
1042                         FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n",
1043                                      rjt->er_reason, rjt->er_explan);
1044                 fc_rport_error_retry(rdata, -FC_EX_ELS_RJT);
1045         }
1046 out:
1047         fc_frame_free(fp);
1048 err:
1049         mutex_unlock(&rdata->rp_mutex);
1050 put:
1051         kref_put(&rdata->kref, fc_rport_destroy);
1052 }
1053
1054 static bool
1055 fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata)
1056 {
1057         if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN)
1058                 return true;
1059         if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) &&
1060             (lport->service_params & FCP_SPPF_INIT_FCN))
1061                 return true;
1062         if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) &&
1063             (lport->service_params & FCP_SPPF_TARG_FCN))
1064                 return true;
1065         return false;
1066 }
1067
1068 /**
1069  * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
1070  * @rdata: The remote port to send a PLOGI to
1071  *
1072  * Reference counting: increments kref when sending ELS
1073  */
1074 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
1075 {
1076         struct fc_lport *lport = rdata->local_port;
1077         struct fc_frame *fp;
1078
1079         lockdep_assert_held(&rdata->rp_mutex);
1080
1081         if (!fc_rport_compatible_roles(lport, rdata)) {
1082                 FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n");
1083                 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
1084                 return;
1085         }
1086
1087         FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
1088                      fc_rport_state(rdata));
1089
1090         fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
1091
1092         rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
1093         fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1094         if (!fp) {
1095                 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
1096                 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1097                 return;
1098         }
1099         rdata->e_d_tov = lport->e_d_tov;
1100
1101         kref_get(&rdata->kref);
1102         if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
1103                                   fc_rport_plogi_resp, rdata,
1104                                   2 * lport->r_a_tov)) {
1105                 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
1106                 kref_put(&rdata->kref, fc_rport_destroy);
1107         }
1108 }
1109
1110 /**
1111  * fc_rport_prli_resp() - Process Login (PRLI) response handler
1112  * @sp:        The sequence the PRLI response was on
1113  * @fp:        The PRLI response frame
1114  * @rdata_arg: The remote port that sent the PRLI response
1115  *
1116  * Locking Note: This function will be called without the rport lock
1117  * held, but it will lock, call an _enter_* function or fc_rport_error
1118  * and then unlock the rport.
1119  */
1120 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
1121                                void *rdata_arg)
1122 {
1123         struct fc_rport_priv *rdata = rdata_arg;
1124         struct {
1125                 struct fc_els_prli prli;
1126                 struct fc_els_spp spp;
1127         } *pp;
1128         struct fc_els_spp temp_spp;
1129         struct fc_els_ls_rjt *rjt;
1130         struct fc4_prov *prov;
1131         u32 roles = FC_RPORT_ROLE_UNKNOWN;
1132         u32 fcp_parm = 0;
1133         u8 op;
1134         enum fc_els_spp_resp resp_code;
1135
1136         FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
1137
1138         if (fp == ERR_PTR(-FC_EX_CLOSED))
1139                 goto put;
1140
1141         mutex_lock(&rdata->rp_mutex);
1142
1143         if (rdata->rp_state != RPORT_ST_PRLI) {
1144                 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
1145                              "%s\n", fc_rport_state(rdata));
1146                 if (IS_ERR(fp))
1147                         goto err;
1148                 goto out;
1149         }
1150
1151         if (IS_ERR(fp)) {
1152                 fc_rport_error_retry(rdata, PTR_ERR(fp));
1153                 goto err;
1154         }
1155
1156         /* reinitialize remote port roles */
1157         rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1158
1159         op = fc_frame_payload_op(fp);
1160         if (op == ELS_LS_ACC) {
1161                 pp = fc_frame_payload_get(fp, sizeof(*pp));
1162                 if (!pp) {
1163                         fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
1164                         goto out;
1165                 }
1166
1167                 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
1168                 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n",
1169                              pp->spp.spp_flags, pp->spp.spp_type);
1170                 rdata->spp_type = pp->spp.spp_type;
1171                 if (resp_code != FC_SPP_RESP_ACK) {
1172                         if (resp_code == FC_SPP_RESP_CONF)
1173                                 fc_rport_error(rdata, -FC_EX_SEQ_ERR);
1174                         else
1175                                 fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
1176                         goto out;
1177                 }
1178                 if (pp->prli.prli_spp_len < sizeof(pp->spp)) {
1179                         fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
1180                         goto out;
1181                 }
1182
1183                 fcp_parm = ntohl(pp->spp.spp_params);
1184                 if (fcp_parm & FCP_SPPF_RETRY)
1185                         rdata->flags |= FC_RP_FLAGS_RETRY;
1186                 if (fcp_parm & FCP_SPPF_CONF_COMPL)
1187                         rdata->flags |= FC_RP_FLAGS_CONF_REQ;
1188
1189                 /*
1190                  * Call prli provider if we should act as a target
1191                  */
1192                 prov = fc_passive_prov[rdata->spp_type];
1193                 if (prov) {
1194                         memset(&temp_spp, 0, sizeof(temp_spp));
1195                         prov->prli(rdata, pp->prli.prli_spp_len,
1196                                    &pp->spp, &temp_spp);
1197                 }
1198                 /*
1199                  * Check if the image pair could be established
1200                  */
1201                 if (rdata->spp_type != FC_TYPE_FCP ||
1202                     !(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) {
1203                         /*
1204                          * Nope; we can't use this port as a target.
1205                          */
1206                         fcp_parm &= ~FCP_SPPF_TARG_FCN;
1207                 }
1208                 rdata->supported_classes = FC_COS_CLASS3;
1209                 if (fcp_parm & FCP_SPPF_INIT_FCN)
1210                         roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1211                 if (fcp_parm & FCP_SPPF_TARG_FCN)
1212                         roles |= FC_RPORT_ROLE_FCP_TARGET;
1213
1214                 rdata->ids.roles = roles;
1215                 fc_rport_enter_rtv(rdata);
1216
1217         } else {
1218                 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1219                 if (!rjt)
1220                         FC_RPORT_DBG(rdata, "PRLI bad response\n");
1221                 else
1222                         FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n",
1223                                      rjt->er_reason, rjt->er_explan);
1224                 fc_rport_error_retry(rdata, FC_EX_ELS_RJT);
1225         }
1226
1227 out:
1228         fc_frame_free(fp);
1229 err:
1230         mutex_unlock(&rdata->rp_mutex);
1231 put:
1232         kref_put(&rdata->kref, fc_rport_destroy);
1233 }
1234
1235 /**
1236  * fc_rport_enter_prli() - Send Process Login (PRLI) request
1237  * @rdata: The remote port to send the PRLI request to
1238  *
1239  * Reference counting: increments kref when sending ELS
1240  */
1241 static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
1242 {
1243         struct fc_lport *lport = rdata->local_port;
1244         struct {
1245                 struct fc_els_prli prli;
1246                 struct fc_els_spp spp;
1247         } *pp;
1248         struct fc_frame *fp;
1249         struct fc4_prov *prov;
1250
1251         lockdep_assert_held(&rdata->rp_mutex);
1252
1253         /*
1254          * If the rport is one of the well known addresses
1255          * we skip PRLI and RTV and go straight to READY.
1256          */
1257         if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
1258                 fc_rport_enter_ready(rdata);
1259                 return;
1260         }
1261
1262         /*
1263          * And if the local port does not support the initiator function
1264          * there's no need to send a PRLI, either.
1265          */
1266         if (!(lport->service_params & FCP_SPPF_INIT_FCN)) {
1267                     fc_rport_enter_ready(rdata);
1268                     return;
1269         }
1270
1271         FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
1272                      fc_rport_state(rdata));
1273
1274         fc_rport_state_enter(rdata, RPORT_ST_PRLI);
1275
1276         fp = fc_frame_alloc(lport, sizeof(*pp));
1277         if (!fp) {
1278                 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1279                 return;
1280         }
1281
1282         fc_prli_fill(lport, fp);
1283
1284         prov = fc_passive_prov[FC_TYPE_FCP];
1285         if (prov) {
1286                 pp = fc_frame_payload_get(fp, sizeof(*pp));
1287                 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1288         }
1289
1290         fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
1291                        fc_host_port_id(lport->host), FC_TYPE_ELS,
1292                        FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1293
1294         kref_get(&rdata->kref);
1295         if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp,
1296                               NULL, rdata, 2 * lport->r_a_tov)) {
1297                 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
1298                 kref_put(&rdata->kref, fc_rport_destroy);
1299         }
1300 }
1301
1302 /**
1303  * fc_rport_rtv_resp() - Handler for Request Timeout Value (RTV) responses
1304  * @sp:        The sequence the RTV was on
1305  * @fp:        The RTV response frame
1306  * @rdata_arg: The remote port that sent the RTV response
1307  *
1308  * Many targets don't seem to support this.
1309  *
1310  * Locking Note: This function will be called without the rport lock
1311  * held, but it will lock, call an _enter_* function or fc_rport_error
1312  * and then unlock the rport.
1313  */
1314 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
1315                               void *rdata_arg)
1316 {
1317         struct fc_rport_priv *rdata = rdata_arg;
1318         u8 op;
1319
1320         FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
1321
1322         if (fp == ERR_PTR(-FC_EX_CLOSED))
1323                 goto put;
1324
1325         mutex_lock(&rdata->rp_mutex);
1326
1327         if (rdata->rp_state != RPORT_ST_RTV) {
1328                 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
1329                              "%s\n", fc_rport_state(rdata));
1330                 if (IS_ERR(fp))
1331                         goto err;
1332                 goto out;
1333         }
1334
1335         if (IS_ERR(fp)) {
1336                 fc_rport_error(rdata, PTR_ERR(fp));
1337                 goto err;
1338         }
1339
1340         op = fc_frame_payload_op(fp);
1341         if (op == ELS_LS_ACC) {
1342                 struct fc_els_rtv_acc *rtv;
1343                 u32 toq;
1344                 u32 tov;
1345
1346                 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
1347                 if (rtv) {
1348                         toq = ntohl(rtv->rtv_toq);
1349                         tov = ntohl(rtv->rtv_r_a_tov);
1350                         if (tov == 0)
1351                                 tov = 1;
1352                         if (tov > rdata->r_a_tov)
1353                                 rdata->r_a_tov = tov;
1354                         tov = ntohl(rtv->rtv_e_d_tov);
1355                         if (toq & FC_ELS_RTV_EDRES)
1356                                 tov /= 1000000;
1357                         if (tov == 0)
1358                                 tov = 1;
1359                         if (tov > rdata->e_d_tov)
1360                                 rdata->e_d_tov = tov;
1361                 }
1362         }
1363
1364         fc_rport_enter_ready(rdata);
1365
1366 out:
1367         fc_frame_free(fp);
1368 err:
1369         mutex_unlock(&rdata->rp_mutex);
1370 put:
1371         kref_put(&rdata->kref, fc_rport_destroy);
1372 }
1373
1374 /**
1375  * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
1376  * @rdata: The remote port to send the RTV request to
1377  *
1378  * Reference counting: increments kref when sending ELS
1379  */
1380 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
1381 {
1382         struct fc_frame *fp;
1383         struct fc_lport *lport = rdata->local_port;
1384
1385         lockdep_assert_held(&rdata->rp_mutex);
1386
1387         FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
1388                      fc_rport_state(rdata));
1389
1390         fc_rport_state_enter(rdata, RPORT_ST_RTV);
1391
1392         fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
1393         if (!fp) {
1394                 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1395                 return;
1396         }
1397
1398         kref_get(&rdata->kref);
1399         if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
1400                                   fc_rport_rtv_resp, rdata,
1401                                   2 * lport->r_a_tov)) {
1402                 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
1403                 kref_put(&rdata->kref, fc_rport_destroy);
1404         }
1405 }
1406
1407 /**
1408  * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests
1409  * @rdata: The remote port that sent the RTV request
1410  * @in_fp: The RTV request frame
1411  */
1412 static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata,
1413                                   struct fc_frame *in_fp)
1414 {
1415         struct fc_lport *lport = rdata->local_port;
1416         struct fc_frame *fp;
1417         struct fc_els_rtv_acc *rtv;
1418         struct fc_seq_els_data rjt_data;
1419
1420         lockdep_assert_held(&rdata->rp_mutex);
1421         lockdep_assert_held(&lport->lp_mutex);
1422
1423         FC_RPORT_DBG(rdata, "Received RTV request\n");
1424
1425         fp = fc_frame_alloc(lport, sizeof(*rtv));
1426         if (!fp) {
1427                 rjt_data.reason = ELS_RJT_UNAB;
1428                 rjt_data.explan = ELS_EXPL_INSUF_RES;
1429                 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1430                 goto drop;
1431         }
1432         rtv = fc_frame_payload_get(fp, sizeof(*rtv));
1433         rtv->rtv_cmd = ELS_LS_ACC;
1434         rtv->rtv_r_a_tov = htonl(lport->r_a_tov);
1435         rtv->rtv_e_d_tov = htonl(lport->e_d_tov);
1436         rtv->rtv_toq = 0;
1437         fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1438         lport->tt.frame_send(lport, fp);
1439 drop:
1440         fc_frame_free(in_fp);
1441 }
1442
1443 /**
1444  * fc_rport_logo_resp() - Handler for logout (LOGO) responses
1445  * @sp:        The sequence the LOGO was on
1446  * @fp:        The LOGO response frame
1447  * @lport_arg: The local port
1448  */
1449 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1450                                void *rdata_arg)
1451 {
1452         struct fc_rport_priv *rdata = rdata_arg;
1453         struct fc_lport *lport = rdata->local_port;
1454
1455         FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
1456                         "Received a LOGO %s\n", fc_els_resp_type(fp));
1457         if (!IS_ERR(fp))
1458                 fc_frame_free(fp);
1459         kref_put(&rdata->kref, fc_rport_destroy);
1460 }
1461
1462 /**
1463  * fc_rport_enter_logo() - Send a logout (LOGO) request
1464  * @rdata: The remote port to send the LOGO request to
1465  *
1466  * Reference counting: increments kref when sending ELS
1467  */
1468 static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
1469 {
1470         struct fc_lport *lport = rdata->local_port;
1471         struct fc_frame *fp;
1472
1473         lockdep_assert_held(&rdata->rp_mutex);
1474
1475         FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
1476                      fc_rport_state(rdata));
1477
1478         fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
1479         if (!fp)
1480                 return;
1481         kref_get(&rdata->kref);
1482         if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
1483                                   fc_rport_logo_resp, rdata, 0))
1484                 kref_put(&rdata->kref, fc_rport_destroy);
1485 }
1486
1487 /**
1488  * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses
1489  * @sp:        The sequence the ADISC response was on
1490  * @fp:        The ADISC response frame
1491  * @rdata_arg: The remote port that sent the ADISC response
1492  *
1493  * Locking Note: This function will be called without the rport lock
1494  * held, but it will lock, call an _enter_* function or fc_rport_error
1495  * and then unlock the rport.
1496  */
1497 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
1498                                 void *rdata_arg)
1499 {
1500         struct fc_rport_priv *rdata = rdata_arg;
1501         struct fc_els_adisc *adisc;
1502         u8 op;
1503
1504         FC_RPORT_DBG(rdata, "Received a ADISC response\n");
1505
1506         if (fp == ERR_PTR(-FC_EX_CLOSED))
1507                 goto put;
1508
1509         mutex_lock(&rdata->rp_mutex);
1510
1511         if (rdata->rp_state != RPORT_ST_ADISC) {
1512                 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
1513                              fc_rport_state(rdata));
1514                 if (IS_ERR(fp))
1515                         goto err;
1516                 goto out;
1517         }
1518
1519         if (IS_ERR(fp)) {
1520                 fc_rport_error(rdata, PTR_ERR(fp));
1521                 goto err;
1522         }
1523
1524         /*
1525          * If address verification failed.  Consider us logged out of the rport.
1526          * Since the rport is still in discovery, we want to be
1527          * logged in, so go to PLOGI state.  Otherwise, go back to READY.
1528          */
1529         op = fc_frame_payload_op(fp);
1530         adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1531         if (op != ELS_LS_ACC || !adisc ||
1532             ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
1533             get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
1534             get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
1535                 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
1536                 fc_rport_enter_flogi(rdata);
1537         } else {
1538                 FC_RPORT_DBG(rdata, "ADISC OK\n");
1539                 fc_rport_enter_ready(rdata);
1540         }
1541 out:
1542         fc_frame_free(fp);
1543 err:
1544         mutex_unlock(&rdata->rp_mutex);
1545 put:
1546         kref_put(&rdata->kref, fc_rport_destroy);
1547 }
1548
1549 /**
1550  * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
1551  * @rdata: The remote port to send the ADISC request to
1552  *
1553  * Reference counting: increments kref when sending ELS
1554  */
1555 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
1556 {
1557         struct fc_lport *lport = rdata->local_port;
1558         struct fc_frame *fp;
1559
1560         lockdep_assert_held(&rdata->rp_mutex);
1561
1562         FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
1563                      fc_rport_state(rdata));
1564
1565         fc_rport_state_enter(rdata, RPORT_ST_ADISC);
1566
1567         fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1568         if (!fp) {
1569                 fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1570                 return;
1571         }
1572         kref_get(&rdata->kref);
1573         if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1574                                   fc_rport_adisc_resp, rdata,
1575                                   2 * lport->r_a_tov)) {
1576                 fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
1577                 kref_put(&rdata->kref, fc_rport_destroy);
1578         }
1579 }
1580
1581 /**
1582  * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
1583  * @rdata: The remote port that sent the ADISC request
1584  * @in_fp: The ADISC request frame
1585  */
1586 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1587                                     struct fc_frame *in_fp)
1588 {
1589         struct fc_lport *lport = rdata->local_port;
1590         struct fc_frame *fp;
1591         struct fc_els_adisc *adisc;
1592         struct fc_seq_els_data rjt_data;
1593
1594         lockdep_assert_held(&rdata->rp_mutex);
1595         lockdep_assert_held(&lport->lp_mutex);
1596
1597         FC_RPORT_DBG(rdata, "Received ADISC request\n");
1598
1599         adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
1600         if (!adisc) {
1601                 rjt_data.reason = ELS_RJT_PROT;
1602                 rjt_data.explan = ELS_EXPL_INV_LEN;
1603                 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1604                 goto drop;
1605         }
1606
1607         fp = fc_frame_alloc(lport, sizeof(*adisc));
1608         if (!fp)
1609                 goto drop;
1610         fc_adisc_fill(lport, fp);
1611         adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1612         adisc->adisc_cmd = ELS_LS_ACC;
1613         fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1614         lport->tt.frame_send(lport, fp);
1615 drop:
1616         fc_frame_free(in_fp);
1617 }
1618
1619 /**
1620  * fc_rport_recv_rls_req() - Handle received Read Link Status request
1621  * @rdata: The remote port that sent the RLS request
1622  * @rx_fp: The PRLI request frame
1623  */
1624 static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
1625                                   struct fc_frame *rx_fp)
1626
1627 {
1628         struct fc_lport *lport = rdata->local_port;
1629         struct fc_frame *fp;
1630         struct fc_els_rls *rls;
1631         struct fc_els_rls_resp *rsp;
1632         struct fc_els_lesb *lesb;
1633         struct fc_seq_els_data rjt_data;
1634         struct fc_host_statistics *hst;
1635
1636         lockdep_assert_held(&rdata->rp_mutex);
1637
1638         FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
1639                      fc_rport_state(rdata));
1640
1641         rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
1642         if (!rls) {
1643                 rjt_data.reason = ELS_RJT_PROT;
1644                 rjt_data.explan = ELS_EXPL_INV_LEN;
1645                 goto out_rjt;
1646         }
1647
1648         fp = fc_frame_alloc(lport, sizeof(*rsp));
1649         if (!fp) {
1650                 rjt_data.reason = ELS_RJT_UNAB;
1651                 rjt_data.explan = ELS_EXPL_INSUF_RES;
1652                 goto out_rjt;
1653         }
1654
1655         rsp = fc_frame_payload_get(fp, sizeof(*rsp));
1656         memset(rsp, 0, sizeof(*rsp));
1657         rsp->rls_cmd = ELS_LS_ACC;
1658         lesb = &rsp->rls_lesb;
1659         if (lport->tt.get_lesb) {
1660                 /* get LESB from LLD if it supports it */
1661                 lport->tt.get_lesb(lport, lesb);
1662         } else {
1663                 fc_get_host_stats(lport->host);
1664                 hst = &lport->host_stats;
1665                 lesb->lesb_link_fail = htonl(hst->link_failure_count);
1666                 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
1667                 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
1668                 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
1669                 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
1670                 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
1671         }
1672
1673         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1674         lport->tt.frame_send(lport, fp);
1675         goto out;
1676
1677 out_rjt:
1678         fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1679 out:
1680         fc_frame_free(rx_fp);
1681 }
1682
1683 /**
1684  * fc_rport_recv_els_req() - Handler for validated ELS requests
1685  * @lport: The local port that received the ELS request
1686  * @fp:    The ELS request frame
1687  *
1688  * Handle incoming ELS requests that require port login.
1689  * The ELS opcode has already been validated by the caller.
1690  *
1691  * Reference counting: does not modify kref
1692  */
1693 static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
1694 {
1695         struct fc_rport_priv *rdata;
1696         struct fc_seq_els_data els_data;
1697
1698         lockdep_assert_held(&lport->lp_mutex);
1699
1700         rdata = fc_rport_lookup(lport, fc_frame_sid(fp));
1701         if (!rdata) {
1702                 FC_RPORT_ID_DBG(lport, fc_frame_sid(fp),
1703                                 "Received ELS 0x%02x from non-logged-in port\n",
1704                                 fc_frame_payload_op(fp));
1705                 goto reject;
1706         }
1707
1708         mutex_lock(&rdata->rp_mutex);
1709
1710         switch (rdata->rp_state) {
1711         case RPORT_ST_PRLI:
1712         case RPORT_ST_RTV:
1713         case RPORT_ST_READY:
1714         case RPORT_ST_ADISC:
1715                 break;
1716         case RPORT_ST_PLOGI:
1717                 if (fc_frame_payload_op(fp) == ELS_PRLI) {
1718                         FC_RPORT_DBG(rdata, "Reject ELS PRLI "
1719                                      "while in state %s\n",
1720                                      fc_rport_state(rdata));
1721                         mutex_unlock(&rdata->rp_mutex);
1722                         kref_put(&rdata->kref, fc_rport_destroy);
1723                         goto busy;
1724                 }
1725                 /* fall through */
1726         default:
1727                 FC_RPORT_DBG(rdata,
1728                              "Reject ELS 0x%02x while in state %s\n",
1729                              fc_frame_payload_op(fp), fc_rport_state(rdata));
1730                 mutex_unlock(&rdata->rp_mutex);
1731                 kref_put(&rdata->kref, fc_rport_destroy);
1732                 goto reject;
1733         }
1734
1735         switch (fc_frame_payload_op(fp)) {
1736         case ELS_PRLI:
1737                 fc_rport_recv_prli_req(rdata, fp);
1738                 break;
1739         case ELS_PRLO:
1740                 fc_rport_recv_prlo_req(rdata, fp);
1741                 break;
1742         case ELS_ADISC:
1743                 fc_rport_recv_adisc_req(rdata, fp);
1744                 break;
1745         case ELS_RRQ:
1746                 fc_seq_els_rsp_send(fp, ELS_RRQ, NULL);
1747                 fc_frame_free(fp);
1748                 break;
1749         case ELS_REC:
1750                 fc_seq_els_rsp_send(fp, ELS_REC, NULL);
1751                 fc_frame_free(fp);
1752                 break;
1753         case ELS_RLS:
1754                 fc_rport_recv_rls_req(rdata, fp);
1755                 break;
1756         case ELS_RTV:
1757                 fc_rport_recv_rtv_req(rdata, fp);
1758                 break;
1759         default:
1760                 fc_frame_free(fp);      /* can't happen */
1761                 break;
1762         }
1763
1764         mutex_unlock(&rdata->rp_mutex);
1765         kref_put(&rdata->kref, fc_rport_destroy);
1766         return;
1767
1768 reject:
1769         els_data.reason = ELS_RJT_UNAB;
1770         els_data.explan = ELS_EXPL_PLOGI_REQD;
1771         fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1772         fc_frame_free(fp);
1773         return;
1774
1775 busy:
1776         els_data.reason = ELS_RJT_BUSY;
1777         els_data.explan = ELS_EXPL_NONE;
1778         fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1779         fc_frame_free(fp);
1780         return;
1781 }
1782
1783 /**
1784  * fc_rport_recv_req() - Handler for requests
1785  * @lport: The local port that received the request
1786  * @fp:    The request frame
1787  *
1788  * Reference counting: does not modify kref
1789  */
1790 void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
1791 {
1792         struct fc_seq_els_data els_data;
1793
1794         lockdep_assert_held(&lport->lp_mutex);
1795
1796         /*
1797          * Handle FLOGI, PLOGI and LOGO requests separately, since they
1798          * don't require prior login.
1799          * Check for unsupported opcodes first and reject them.
1800          * For some ops, it would be incorrect to reject with "PLOGI required".
1801          */
1802         switch (fc_frame_payload_op(fp)) {
1803         case ELS_FLOGI:
1804                 fc_rport_recv_flogi_req(lport, fp);
1805                 break;
1806         case ELS_PLOGI:
1807                 fc_rport_recv_plogi_req(lport, fp);
1808                 break;
1809         case ELS_LOGO:
1810                 fc_rport_recv_logo_req(lport, fp);
1811                 break;
1812         case ELS_PRLI:
1813         case ELS_PRLO:
1814         case ELS_ADISC:
1815         case ELS_RRQ:
1816         case ELS_REC:
1817         case ELS_RLS:
1818         case ELS_RTV:
1819                 fc_rport_recv_els_req(lport, fp);
1820                 break;
1821         default:
1822                 els_data.reason = ELS_RJT_UNSUP;
1823                 els_data.explan = ELS_EXPL_NONE;
1824                 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1825                 fc_frame_free(fp);
1826                 break;
1827         }
1828 }
1829 EXPORT_SYMBOL(fc_rport_recv_req);
1830
1831 /**
1832  * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
1833  * @lport: The local port that received the PLOGI request
1834  * @rx_fp: The PLOGI request frame
1835  *
1836  * Reference counting: increments kref on return
1837  */
1838 static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1839                                     struct fc_frame *rx_fp)
1840 {
1841         struct fc_disc *disc;
1842         struct fc_rport_priv *rdata;
1843         struct fc_frame *fp = rx_fp;
1844         struct fc_els_flogi *pl;
1845         struct fc_seq_els_data rjt_data;
1846         u32 sid;
1847
1848         lockdep_assert_held(&lport->lp_mutex);
1849
1850         sid = fc_frame_sid(fp);
1851
1852         FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1853
1854         pl = fc_frame_payload_get(fp, sizeof(*pl));
1855         if (!pl) {
1856                 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1857                 rjt_data.reason = ELS_RJT_PROT;
1858                 rjt_data.explan = ELS_EXPL_INV_LEN;
1859                 goto reject;
1860         }
1861
1862         disc = &lport->disc;
1863         mutex_lock(&disc->disc_mutex);
1864         rdata = fc_rport_create(lport, sid);
1865         if (!rdata) {
1866                 mutex_unlock(&disc->disc_mutex);
1867                 rjt_data.reason = ELS_RJT_UNAB;
1868                 rjt_data.explan = ELS_EXPL_INSUF_RES;
1869                 goto reject;
1870         }
1871
1872         mutex_lock(&rdata->rp_mutex);
1873         mutex_unlock(&disc->disc_mutex);
1874
1875         rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1876         rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
1877
1878         /*
1879          * If the rport was just created, possibly due to the incoming PLOGI,
1880          * set the state appropriately and accept the PLOGI.
1881          *
1882          * If we had also sent a PLOGI, and if the received PLOGI is from a
1883          * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1884          * "command already in progress".
1885          *
1886          * XXX TBD: If the session was ready before, the PLOGI should result in
1887          * all outstanding exchanges being reset.
1888          */
1889         switch (rdata->rp_state) {
1890         case RPORT_ST_INIT:
1891                 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1892                 break;
1893         case RPORT_ST_PLOGI_WAIT:
1894                 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
1895                 break;
1896         case RPORT_ST_PLOGI:
1897                 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1898                 if (rdata->ids.port_name < lport->wwpn) {
1899                         mutex_unlock(&rdata->rp_mutex);
1900                         rjt_data.reason = ELS_RJT_INPROG;
1901                         rjt_data.explan = ELS_EXPL_NONE;
1902                         goto reject;
1903                 }
1904                 break;
1905         case RPORT_ST_PRLI:
1906         case RPORT_ST_RTV:
1907         case RPORT_ST_READY:
1908         case RPORT_ST_ADISC:
1909                 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1910                              "- ignored for now\n", rdata->rp_state);
1911                 /* XXX TBD - should reset */
1912                 break;
1913         case RPORT_ST_FLOGI:
1914         case RPORT_ST_DELETE:
1915                 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
1916                              fc_rport_state(rdata));
1917                 mutex_unlock(&rdata->rp_mutex);
1918                 rjt_data.reason = ELS_RJT_BUSY;
1919                 rjt_data.explan = ELS_EXPL_NONE;
1920                 goto reject;
1921         }
1922         if (!fc_rport_compatible_roles(lport, rdata)) {
1923                 FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n");
1924                 mutex_unlock(&rdata->rp_mutex);
1925                 rjt_data.reason = ELS_RJT_LOGIC;
1926                 rjt_data.explan = ELS_EXPL_NONE;
1927                 goto reject;
1928         }
1929
1930         /*
1931          * Get session payload size from incoming PLOGI.
1932          */
1933         rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
1934
1935         /*
1936          * Send LS_ACC.  If this fails, the originator should retry.
1937          */
1938         fp = fc_frame_alloc(lport, sizeof(*pl));
1939         if (!fp)
1940                 goto out;
1941
1942         fc_plogi_fill(lport, fp, ELS_LS_ACC);
1943         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1944         lport->tt.frame_send(lport, fp);
1945         fc_rport_enter_prli(rdata);
1946 out:
1947         mutex_unlock(&rdata->rp_mutex);
1948         fc_frame_free(rx_fp);
1949         return;
1950
1951 reject:
1952         fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
1953         fc_frame_free(fp);
1954 }
1955
1956 /**
1957  * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
1958  * @rdata: The remote port that sent the PRLI request
1959  * @rx_fp: The PRLI request frame
1960  */
1961 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1962                                    struct fc_frame *rx_fp)
1963 {
1964         struct fc_lport *lport = rdata->local_port;
1965         struct fc_frame *fp;
1966         struct {
1967                 struct fc_els_prli prli;
1968                 struct fc_els_spp spp;
1969         } *pp;
1970         struct fc_els_spp *rspp;        /* request service param page */
1971         struct fc_els_spp *spp; /* response spp */
1972         unsigned int len;
1973         unsigned int plen;
1974         enum fc_els_spp_resp resp;
1975         struct fc_seq_els_data rjt_data;
1976         struct fc4_prov *prov;
1977
1978         lockdep_assert_held(&rdata->rp_mutex);
1979
1980         FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1981                      fc_rport_state(rdata));
1982
1983         len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1984         pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1985         if (!pp)
1986                 goto reject_len;
1987         plen = ntohs(pp->prli.prli_len);
1988         if ((plen % 4) != 0 || plen > len || plen < 16)
1989                 goto reject_len;
1990         if (plen < len)
1991                 len = plen;
1992         plen = pp->prli.prli_spp_len;
1993         if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1994             plen > len || len < sizeof(*pp) || plen < 12)
1995                 goto reject_len;
1996         rspp = &pp->spp;
1997
1998         fp = fc_frame_alloc(lport, len);
1999         if (!fp) {
2000                 rjt_data.reason = ELS_RJT_UNAB;
2001                 rjt_data.explan = ELS_EXPL_INSUF_RES;
2002                 goto reject;
2003         }
2004         pp = fc_frame_payload_get(fp, len);
2005         WARN_ON(!pp);
2006         memset(pp, 0, len);
2007         pp->prli.prli_cmd = ELS_LS_ACC;
2008         pp->prli.prli_spp_len = plen;
2009         pp->prli.prli_len = htons(len);
2010         len -= sizeof(struct fc_els_prli);
2011
2012         /*
2013          * Go through all the service parameter pages and build
2014          * response.  If plen indicates longer SPP than standard,
2015          * use that.  The entire response has been pre-cleared above.
2016          */
2017         spp = &pp->spp;
2018         mutex_lock(&fc_prov_mutex);
2019         while (len >= plen) {
2020                 rdata->spp_type = rspp->spp_type;
2021                 spp->spp_type = rspp->spp_type;
2022                 spp->spp_type_ext = rspp->spp_type_ext;
2023                 resp = 0;
2024
2025                 if (rspp->spp_type < FC_FC4_PROV_SIZE) {
2026                         enum fc_els_spp_resp active = 0, passive = 0;
2027
2028                         prov = fc_active_prov[rspp->spp_type];
2029                         if (prov)
2030                                 active = prov->prli(rdata, plen, rspp, spp);
2031                         prov = fc_passive_prov[rspp->spp_type];
2032                         if (prov)
2033                                 passive = prov->prli(rdata, plen, rspp, spp);
2034                         if (!active || passive == FC_SPP_RESP_ACK)
2035                                 resp = passive;
2036                         else
2037                                 resp = active;
2038                         FC_RPORT_DBG(rdata, "PRLI rspp type %x "
2039                                      "active %x passive %x\n",
2040                                      rspp->spp_type, active, passive);
2041                 }
2042                 if (!resp) {
2043                         if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
2044                                 resp |= FC_SPP_RESP_CONF;
2045                         else
2046                                 resp |= FC_SPP_RESP_INVL;
2047                 }
2048                 spp->spp_flags |= resp;
2049                 len -= plen;
2050                 rspp = (struct fc_els_spp *)((char *)rspp + plen);
2051                 spp = (struct fc_els_spp *)((char *)spp + plen);
2052         }
2053         mutex_unlock(&fc_prov_mutex);
2054
2055         /*
2056          * Send LS_ACC.  If this fails, the originator should retry.
2057          */
2058         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
2059         lport->tt.frame_send(lport, fp);
2060
2061         goto drop;
2062
2063 reject_len:
2064         rjt_data.reason = ELS_RJT_PROT;
2065         rjt_data.explan = ELS_EXPL_INV_LEN;
2066 reject:
2067         fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2068 drop:
2069         fc_frame_free(rx_fp);
2070 }
2071
2072 /**
2073  * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
2074  * @rdata: The remote port that sent the PRLO request
2075  * @rx_fp: The PRLO request frame
2076  */
2077 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
2078                                    struct fc_frame *rx_fp)
2079 {
2080         struct fc_lport *lport = rdata->local_port;
2081         struct fc_frame *fp;
2082         struct {
2083                 struct fc_els_prlo prlo;
2084                 struct fc_els_spp spp;
2085         } *pp;
2086         struct fc_els_spp *rspp;        /* request service param page */
2087         struct fc_els_spp *spp;         /* response spp */
2088         unsigned int len;
2089         unsigned int plen;
2090         struct fc_seq_els_data rjt_data;
2091
2092         lockdep_assert_held(&rdata->rp_mutex);
2093
2094         FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
2095                      fc_rport_state(rdata));
2096
2097         len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
2098         pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
2099         if (!pp)
2100                 goto reject_len;
2101         plen = ntohs(pp->prlo.prlo_len);
2102         if (plen != 20)
2103                 goto reject_len;
2104         if (plen < len)
2105                 len = plen;
2106
2107         rspp = &pp->spp;
2108
2109         fp = fc_frame_alloc(lport, len);
2110         if (!fp) {
2111                 rjt_data.reason = ELS_RJT_UNAB;
2112                 rjt_data.explan = ELS_EXPL_INSUF_RES;
2113                 goto reject;
2114         }
2115
2116         pp = fc_frame_payload_get(fp, len);
2117         WARN_ON(!pp);
2118         memset(pp, 0, len);
2119         pp->prlo.prlo_cmd = ELS_LS_ACC;
2120         pp->prlo.prlo_obs = 0x10;
2121         pp->prlo.prlo_len = htons(len);
2122         spp = &pp->spp;
2123         spp->spp_type = rspp->spp_type;
2124         spp->spp_type_ext = rspp->spp_type_ext;
2125         spp->spp_flags = FC_SPP_RESP_ACK;
2126
2127         fc_rport_enter_prli(rdata);
2128
2129         fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
2130         lport->tt.frame_send(lport, fp);
2131         goto drop;
2132
2133 reject_len:
2134         rjt_data.reason = ELS_RJT_PROT;
2135         rjt_data.explan = ELS_EXPL_INV_LEN;
2136 reject:
2137         fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2138 drop:
2139         fc_frame_free(rx_fp);
2140 }
2141
2142 /**
2143  * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
2144  * @lport: The local port that received the LOGO request
2145  * @fp:    The LOGO request frame
2146  *
2147  * Reference counting: drops kref on return
2148  */
2149 static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
2150 {
2151         struct fc_rport_priv *rdata;
2152         u32 sid;
2153
2154         lockdep_assert_held(&lport->lp_mutex);
2155
2156         fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
2157
2158         sid = fc_frame_sid(fp);
2159
2160         rdata = fc_rport_lookup(lport, sid);
2161         if (rdata) {
2162                 mutex_lock(&rdata->rp_mutex);
2163                 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
2164                              fc_rport_state(rdata));
2165
2166                 rdata->flags &= ~FC_RP_STARTED;
2167                 fc_rport_enter_delete(rdata, RPORT_EV_STOP);
2168                 mutex_unlock(&rdata->rp_mutex);
2169                 kref_put(&rdata->kref, fc_rport_destroy);
2170         } else
2171                 FC_RPORT_ID_DBG(lport, sid,
2172                                 "Received LOGO from non-logged-in port\n");
2173         fc_frame_free(fp);
2174 }
2175
2176 /**
2177  * fc_rport_flush_queue() - Flush the rport_event_queue
2178  */
2179 void fc_rport_flush_queue(void)
2180 {
2181         flush_workqueue(rport_event_queue);
2182 }
2183 EXPORT_SYMBOL(fc_rport_flush_queue);
2184
2185 /**
2186  * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
2187  * @rdata: remote port private
2188  * @spp_len: service parameter page length
2189  * @rspp: received service parameter page
2190  * @spp: response service parameter page
2191  *
2192  * Returns the value for the response code to be placed in spp_flags;
2193  * Returns 0 if not an initiator.
2194  */
2195 static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
2196                              const struct fc_els_spp *rspp,
2197                              struct fc_els_spp *spp)
2198 {
2199         struct fc_lport *lport = rdata->local_port;
2200         u32 fcp_parm;
2201
2202         fcp_parm = ntohl(rspp->spp_params);
2203         rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
2204         if (fcp_parm & FCP_SPPF_INIT_FCN)
2205                 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
2206         if (fcp_parm & FCP_SPPF_TARG_FCN)
2207                 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
2208         if (fcp_parm & FCP_SPPF_RETRY)
2209                 rdata->flags |= FC_RP_FLAGS_RETRY;
2210         rdata->supported_classes = FC_COS_CLASS3;
2211
2212         if (!(lport->service_params & FCP_SPPF_INIT_FCN))
2213                 return 0;
2214
2215         spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
2216
2217         /*
2218          * OR in our service parameters with other providers (target), if any.
2219          */
2220         fcp_parm = ntohl(spp->spp_params);
2221         spp->spp_params = htonl(fcp_parm | lport->service_params);
2222         return FC_SPP_RESP_ACK;
2223 }
2224
2225 /*
2226  * FC-4 provider ops for FCP initiator.
2227  */
2228 struct fc4_prov fc_rport_fcp_init = {
2229         .prli = fc_rport_fcp_prli,
2230 };
2231
2232 /**
2233  * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
2234  * @rdata: remote port private
2235  * @spp_len: service parameter page length
2236  * @rspp: received service parameter page
2237  * @spp: response service parameter page
2238  */
2239 static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
2240                             const struct fc_els_spp *rspp,
2241                             struct fc_els_spp *spp)
2242 {
2243         if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
2244                 return FC_SPP_RESP_INVL;
2245         return FC_SPP_RESP_ACK;
2246 }
2247
2248 /*
2249  * FC-4 provider ops for type 0 service parameters.
2250  *
2251  * This handles the special case of type 0 which is always successful
2252  * but doesn't do anything otherwise.
2253  */
2254 struct fc4_prov fc_rport_t0_prov = {
2255         .prli = fc_rport_t0_prli,
2256 };
2257
2258 /**
2259  * fc_setup_rport() - Initialize the rport_event_queue
2260  */
2261 int fc_setup_rport(void)
2262 {
2263         rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
2264         if (!rport_event_queue)
2265                 return -ENOMEM;
2266         return 0;
2267 }
2268
2269 /**
2270  * fc_destroy_rport() - Destroy the rport_event_queue
2271  */
2272 void fc_destroy_rport(void)
2273 {
2274         destroy_workqueue(rport_event_queue);
2275 }
2276
2277 /**
2278  * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
2279  * @rport: The remote port whose I/O should be terminated
2280  */
2281 void fc_rport_terminate_io(struct fc_rport *rport)
2282 {
2283         struct fc_rport_libfc_priv *rpriv = rport->dd_data;
2284         struct fc_lport *lport = rpriv->local_port;
2285
2286         lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
2287         lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
2288 }
2289 EXPORT_SYMBOL(fc_rport_terminate_io);