drivers/scsi/libfc/fc_rport.c

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