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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
0004  *
0005  * Maintained at www.Open-FCoE.org
0006  */
0007 
0008 /*
0009  * RPORT GENERAL INFO
0010  *
0011  * This file contains all processing regarding fc_rports. It contains the
0012  * rport state machine and does all rport interaction with the transport class.
0013  * There should be no other places in libfc that interact directly with the
0014  * transport class in regards to adding and deleting rports.
0015  *
0016  * fc_rport's represent N_Port's within the fabric.
0017  */
0018 
0019 /*
0020  * RPORT LOCKING
0021  *
0022  * The rport should never hold the rport mutex and then attempt to acquire
0023  * either the lport or disc mutexes. The rport's mutex is considered lesser
0024  * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
0025  * more comments on the hierarchy.
0026  *
0027  * The locking strategy is similar to the lport's strategy. The lock protects
0028  * the rport's states and is held and released by the entry points to the rport
0029  * block. All _enter_* functions correspond to rport states and expect the rport
0030  * mutex to be locked before calling them. This means that rports only handle
0031  * one request or response at a time, since they're not critical for the I/O
0032  * path this potential over-use of the mutex is acceptable.
0033  */
0034 
0035 /*
0036  * RPORT REFERENCE COUNTING
0037  *
0038  * A rport reference should be taken when:
0039  * - an rport is allocated
0040  * - a workqueue item is scheduled
0041  * - an ELS request is send
0042  * The reference should be dropped when:
0043  * - the workqueue function has finished
0044  * - the ELS response is handled
0045  * - an rport is removed
0046  */
0047 
0048 #include <linux/kernel.h>
0049 #include <linux/spinlock.h>
0050 #include <linux/interrupt.h>
0051 #include <linux/slab.h>
0052 #include <linux/rcupdate.h>
0053 #include <linux/timer.h>
0054 #include <linux/workqueue.h>
0055 #include <linux/export.h>
0056 #include <linux/rculist.h>
0057 
0058 #include <asm/unaligned.h>
0059 
0060 #include <scsi/libfc.h>
0061 
0062 #include "fc_encode.h"
0063 #include "fc_libfc.h"
0064 
0065 static struct workqueue_struct *rport_event_queue;
0066 
0067 static void fc_rport_enter_flogi(struct fc_rport_priv *);
0068 static void fc_rport_enter_plogi(struct fc_rport_priv *);
0069 static void fc_rport_enter_prli(struct fc_rport_priv *);
0070 static void fc_rport_enter_rtv(struct fc_rport_priv *);
0071 static void fc_rport_enter_ready(struct fc_rport_priv *);
0072 static void fc_rport_enter_logo(struct fc_rport_priv *);
0073 static void fc_rport_enter_adisc(struct fc_rport_priv *);
0074 
0075 static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
0076 static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
0077 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
0078 static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
0079 static void fc_rport_timeout(struct work_struct *);
0080 static void fc_rport_error(struct fc_rport_priv *, int);
0081 static void fc_rport_error_retry(struct fc_rport_priv *, int);
0082 static void fc_rport_work(struct work_struct *);
0083 
0084 static const char *fc_rport_state_names[] = {
0085     [RPORT_ST_INIT] = "Init",
0086     [RPORT_ST_FLOGI] = "FLOGI",
0087     [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
0088     [RPORT_ST_PLOGI] = "PLOGI",
0089     [RPORT_ST_PRLI] = "PRLI",
0090     [RPORT_ST_RTV] = "RTV",
0091     [RPORT_ST_READY] = "Ready",
0092     [RPORT_ST_ADISC] = "ADISC",
0093     [RPORT_ST_DELETE] = "Delete",
0094 };
0095 
0096 /**
0097  * fc_rport_lookup() - Lookup a remote port by port_id
0098  * @lport:   The local port to lookup the remote port on
0099  * @port_id: The remote port ID to look up
0100  *
0101  * The reference count of the fc_rport_priv structure is
0102  * increased by one.
0103  */
0104 struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
0105                       u32 port_id)
0106 {
0107     struct fc_rport_priv *rdata = NULL, *tmp_rdata;
0108 
0109     rcu_read_lock();
0110     list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
0111         if (tmp_rdata->ids.port_id == port_id &&
0112             kref_get_unless_zero(&tmp_rdata->kref)) {
0113             rdata = tmp_rdata;
0114             break;
0115         }
0116     rcu_read_unlock();
0117     return rdata;
0118 }
0119 EXPORT_SYMBOL(fc_rport_lookup);
0120 
0121 /**
0122  * fc_rport_create() - Create a new remote port
0123  * @lport: The local port this remote port will be associated with
0124  * @port_id:   The identifiers for the new remote port
0125  *
0126  * The remote port will start in the INIT state.
0127  */
0128 struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
0129 {
0130     struct fc_rport_priv *rdata;
0131     size_t rport_priv_size = sizeof(*rdata);
0132 
0133     lockdep_assert_held(&lport->disc.disc_mutex);
0134 
0135     rdata = fc_rport_lookup(lport, port_id);
0136     if (rdata) {
0137         kref_put(&rdata->kref, fc_rport_destroy);
0138         return rdata;
0139     }
0140 
0141     if (lport->rport_priv_size > 0)
0142         rport_priv_size = lport->rport_priv_size;
0143     rdata = kzalloc(rport_priv_size, GFP_KERNEL);
0144     if (!rdata)
0145         return NULL;
0146 
0147     rdata->ids.node_name = -1;
0148     rdata->ids.port_name = -1;
0149     rdata->ids.port_id = port_id;
0150     rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
0151 
0152     kref_init(&rdata->kref);
0153     mutex_init(&rdata->rp_mutex);
0154     rdata->local_port = lport;
0155     rdata->rp_state = RPORT_ST_INIT;
0156     rdata->event = RPORT_EV_NONE;
0157     rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
0158     rdata->e_d_tov = lport->e_d_tov;
0159     rdata->r_a_tov = lport->r_a_tov;
0160     rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
0161     INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
0162     INIT_WORK(&rdata->event_work, fc_rport_work);
0163     if (port_id != FC_FID_DIR_SERV) {
0164         rdata->lld_event_callback = lport->tt.rport_event_callback;
0165         list_add_rcu(&rdata->peers, &lport->disc.rports);
0166     }
0167     return rdata;
0168 }
0169 EXPORT_SYMBOL(fc_rport_create);
0170 
0171 /**
0172  * fc_rport_destroy() - Free a remote port after last reference is released
0173  * @kref: The remote port's kref
0174  */
0175 void fc_rport_destroy(struct kref *kref)
0176 {
0177     struct fc_rport_priv *rdata;
0178 
0179     rdata = container_of(kref, struct fc_rport_priv, kref);
0180     kfree_rcu(rdata, rcu);
0181 }
0182 EXPORT_SYMBOL(fc_rport_destroy);
0183 
0184 /**
0185  * fc_rport_state() - Return a string identifying the remote port's state
0186  * @rdata: The remote port
0187  */
0188 static const char *fc_rport_state(struct fc_rport_priv *rdata)
0189 {
0190     const char *cp;
0191 
0192     cp = fc_rport_state_names[rdata->rp_state];
0193     if (!cp)
0194         cp = "Unknown";
0195     return cp;
0196 }
0197 
0198 /**
0199  * fc_set_rport_loss_tmo() - Set the remote port loss timeout
0200  * @rport:   The remote port that gets a new timeout value
0201  * @timeout: The new timeout value (in seconds)
0202  */
0203 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
0204 {
0205     if (timeout)
0206         rport->dev_loss_tmo = timeout;
0207     else
0208         rport->dev_loss_tmo = 1;
0209 }
0210 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
0211 
0212 /**
0213  * fc_plogi_get_maxframe() - Get the maximum payload from the common service
0214  *               parameters in a FLOGI frame
0215  * @flp:    The FLOGI or PLOGI payload
0216  * @maxval: The maximum frame size upper limit; this may be less than what
0217  *      is in the service parameters
0218  */
0219 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
0220                       unsigned int maxval)
0221 {
0222     unsigned int mfs;
0223 
0224     /*
0225      * Get max payload from the common service parameters and the
0226      * class 3 receive data field size.
0227      */
0228     mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
0229     if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
0230         maxval = mfs;
0231     mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
0232     if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
0233         maxval = mfs;
0234     return maxval;
0235 }
0236 
0237 /**
0238  * fc_rport_state_enter() - Change the state of a remote port
0239  * @rdata: The remote port whose state should change
0240  * @new:   The new state
0241  */
0242 static void fc_rport_state_enter(struct fc_rport_priv *rdata,
0243                  enum fc_rport_state new)
0244 {
0245     lockdep_assert_held(&rdata->rp_mutex);
0246 
0247     if (rdata->rp_state != new)
0248         rdata->retries = 0;
0249     rdata->rp_state = new;
0250 }
0251 
0252 /**
0253  * fc_rport_work() - Handler for remote port events in the rport_event_queue
0254  * @work: Handle to the remote port being dequeued
0255  *
0256  * Reference counting: drops kref on return
0257  */
0258 static void fc_rport_work(struct work_struct *work)
0259 {
0260     u32 port_id;
0261     struct fc_rport_priv *rdata =
0262         container_of(work, struct fc_rport_priv, event_work);
0263     struct fc_rport_libfc_priv *rpriv;
0264     enum fc_rport_event event;
0265     struct fc_lport *lport = rdata->local_port;
0266     struct fc_rport_operations *rport_ops;
0267     struct fc_rport_identifiers ids;
0268     struct fc_rport *rport;
0269     struct fc4_prov *prov;
0270     u8 type;
0271 
0272     mutex_lock(&rdata->rp_mutex);
0273     event = rdata->event;
0274     rport_ops = rdata->ops;
0275     rport = rdata->rport;
0276 
0277     FC_RPORT_DBG(rdata, "work event %u\n", event);
0278 
0279     switch (event) {
0280     case RPORT_EV_READY:
0281         ids = rdata->ids;
0282         rdata->event = RPORT_EV_NONE;
0283         rdata->major_retries = 0;
0284         kref_get(&rdata->kref);
0285         mutex_unlock(&rdata->rp_mutex);
0286 
0287         if (!rport) {
0288             FC_RPORT_DBG(rdata, "No rport!\n");
0289             rport = fc_remote_port_add(lport->host, 0, &ids);
0290         }
0291         if (!rport) {
0292             FC_RPORT_DBG(rdata, "Failed to add the rport\n");
0293             fc_rport_logoff(rdata);
0294             kref_put(&rdata->kref, fc_rport_destroy);
0295             return;
0296         }
0297         mutex_lock(&rdata->rp_mutex);
0298         if (rdata->rport)
0299             FC_RPORT_DBG(rdata, "rport already allocated\n");
0300         rdata->rport = rport;
0301         rport->maxframe_size = rdata->maxframe_size;
0302         rport->supported_classes = rdata->supported_classes;
0303 
0304         rpriv = rport->dd_data;
0305         rpriv->local_port = lport;
0306         rpriv->rp_state = rdata->rp_state;
0307         rpriv->flags = rdata->flags;
0308         rpriv->e_d_tov = rdata->e_d_tov;
0309         rpriv->r_a_tov = rdata->r_a_tov;
0310         mutex_unlock(&rdata->rp_mutex);
0311 
0312         if (rport_ops && rport_ops->event_callback) {
0313             FC_RPORT_DBG(rdata, "callback ev %d\n", event);
0314             rport_ops->event_callback(lport, rdata, event);
0315         }
0316         if (rdata->lld_event_callback) {
0317             FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
0318             rdata->lld_event_callback(lport, rdata, event);
0319         }
0320         kref_put(&rdata->kref, fc_rport_destroy);
0321         break;
0322 
0323     case RPORT_EV_FAILED:
0324     case RPORT_EV_LOGO:
0325     case RPORT_EV_STOP:
0326         if (rdata->prli_count) {
0327             mutex_lock(&fc_prov_mutex);
0328             for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
0329                 prov = fc_passive_prov[type];
0330                 if (prov && prov->prlo)
0331                     prov->prlo(rdata);
0332             }
0333             mutex_unlock(&fc_prov_mutex);
0334         }
0335         port_id = rdata->ids.port_id;
0336         mutex_unlock(&rdata->rp_mutex);
0337 
0338         if (rport_ops && rport_ops->event_callback) {
0339             FC_RPORT_DBG(rdata, "callback ev %d\n", event);
0340             rport_ops->event_callback(lport, rdata, event);
0341         }
0342         if (rdata->lld_event_callback) {
0343             FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
0344             rdata->lld_event_callback(lport, rdata, event);
0345         }
0346         if (cancel_delayed_work_sync(&rdata->retry_work))
0347             kref_put(&rdata->kref, fc_rport_destroy);
0348 
0349         /*
0350          * Reset any outstanding exchanges before freeing rport.
0351          */
0352         lport->tt.exch_mgr_reset(lport, 0, port_id);
0353         lport->tt.exch_mgr_reset(lport, port_id, 0);
0354 
0355         if (rport) {
0356             rpriv = rport->dd_data;
0357             rpriv->rp_state = RPORT_ST_DELETE;
0358             mutex_lock(&rdata->rp_mutex);
0359             rdata->rport = NULL;
0360             mutex_unlock(&rdata->rp_mutex);
0361             fc_remote_port_delete(rport);
0362         }
0363 
0364         mutex_lock(&rdata->rp_mutex);
0365         if (rdata->rp_state == RPORT_ST_DELETE) {
0366             if (port_id == FC_FID_DIR_SERV) {
0367                 rdata->event = RPORT_EV_NONE;
0368                 mutex_unlock(&rdata->rp_mutex);
0369                 kref_put(&rdata->kref, fc_rport_destroy);
0370             } else if ((rdata->flags & FC_RP_STARTED) &&
0371                    rdata->major_retries <
0372                    lport->max_rport_retry_count) {
0373                 rdata->major_retries++;
0374                 rdata->event = RPORT_EV_NONE;
0375                 FC_RPORT_DBG(rdata, "work restart\n");
0376                 fc_rport_enter_flogi(rdata);
0377                 mutex_unlock(&rdata->rp_mutex);
0378             } else {
0379                 mutex_unlock(&rdata->rp_mutex);
0380                 FC_RPORT_DBG(rdata, "work delete\n");
0381                 mutex_lock(&lport->disc.disc_mutex);
0382                 list_del_rcu(&rdata->peers);
0383                 mutex_unlock(&lport->disc.disc_mutex);
0384                 kref_put(&rdata->kref, fc_rport_destroy);
0385             }
0386         } else {
0387             /*
0388              * Re-open for events.  Reissue READY event if ready.
0389              */
0390             rdata->event = RPORT_EV_NONE;
0391             if (rdata->rp_state == RPORT_ST_READY) {
0392                 FC_RPORT_DBG(rdata, "work reopen\n");
0393                 fc_rport_enter_ready(rdata);
0394             }
0395             mutex_unlock(&rdata->rp_mutex);
0396         }
0397         break;
0398 
0399     default:
0400         mutex_unlock(&rdata->rp_mutex);
0401         break;
0402     }
0403     kref_put(&rdata->kref, fc_rport_destroy);
0404 }
0405 
0406 /**
0407  * fc_rport_login() - Start the remote port login state machine
0408  * @rdata: The remote port to be logged in to
0409  *
0410  * Initiates the RP state machine. It is called from the LP module.
0411  * This function will issue the following commands to the N_Port
0412  * identified by the FC ID provided.
0413  *
0414  * - PLOGI
0415  * - PRLI
0416  * - RTV
0417  *
0418  * Locking Note: Called without the rport lock held. This
0419  * function will hold the rport lock, call an _enter_*
0420  * function and then unlock the rport.
0421  *
0422  * This indicates the intent to be logged into the remote port.
0423  * If it appears we are already logged in, ADISC is used to verify
0424  * the setup.
0425  */
0426 int fc_rport_login(struct fc_rport_priv *rdata)
0427 {
0428     mutex_lock(&rdata->rp_mutex);
0429 
0430     if (rdata->flags & FC_RP_STARTED) {
0431         FC_RPORT_DBG(rdata, "port already started\n");
0432         mutex_unlock(&rdata->rp_mutex);
0433         return 0;
0434     }
0435 
0436     rdata->flags |= FC_RP_STARTED;
0437     switch (rdata->rp_state) {
0438     case RPORT_ST_READY:
0439         FC_RPORT_DBG(rdata, "ADISC port\n");
0440         fc_rport_enter_adisc(rdata);
0441         break;
0442     case RPORT_ST_DELETE:
0443         FC_RPORT_DBG(rdata, "Restart deleted port\n");
0444         break;
0445     case RPORT_ST_INIT:
0446         FC_RPORT_DBG(rdata, "Login to port\n");
0447         fc_rport_enter_flogi(rdata);
0448         break;
0449     default:
0450         FC_RPORT_DBG(rdata, "Login in progress, state %s\n",
0451                  fc_rport_state(rdata));
0452         break;
0453     }
0454     mutex_unlock(&rdata->rp_mutex);
0455 
0456     return 0;
0457 }
0458 EXPORT_SYMBOL(fc_rport_login);
0459 
0460 /**
0461  * fc_rport_enter_delete() - Schedule a remote port to be deleted
0462  * @rdata: The remote port to be deleted
0463  * @event: The event to report as the reason for deletion
0464  *
0465  * Allow state change into DELETE only once.
0466  *
0467  * Call queue_work only if there's no event already pending.
0468  * Set the new event so that the old pending event will not occur.
0469  * Since we have the mutex, even if fc_rport_work() is already started,
0470  * it'll see the new event.
0471  *
0472  * Reference counting: does not modify kref
0473  */
0474 static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
0475                   enum fc_rport_event event)
0476 {
0477     lockdep_assert_held(&rdata->rp_mutex);
0478 
0479     if (rdata->rp_state == RPORT_ST_DELETE)
0480         return;
0481 
0482     FC_RPORT_DBG(rdata, "Delete port\n");
0483 
0484     fc_rport_state_enter(rdata, RPORT_ST_DELETE);
0485 
0486     if (rdata->event == RPORT_EV_NONE) {
0487         kref_get(&rdata->kref);
0488         if (!queue_work(rport_event_queue, &rdata->event_work))
0489             kref_put(&rdata->kref, fc_rport_destroy);
0490     }
0491 
0492     rdata->event = event;
0493 }
0494 
0495 /**
0496  * fc_rport_logoff() - Logoff and remove a remote port
0497  * @rdata: The remote port to be logged off of
0498  *
0499  * Locking Note: Called without the rport lock held. This
0500  * function will hold the rport lock, call an _enter_*
0501  * function and then unlock the rport.
0502  */
0503 int fc_rport_logoff(struct fc_rport_priv *rdata)
0504 {
0505     struct fc_lport *lport = rdata->local_port;
0506     u32 port_id = rdata->ids.port_id;
0507 
0508     mutex_lock(&rdata->rp_mutex);
0509 
0510     FC_RPORT_DBG(rdata, "Remove port\n");
0511 
0512     rdata->flags &= ~FC_RP_STARTED;
0513     if (rdata->rp_state == RPORT_ST_DELETE) {
0514         FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
0515         goto out;
0516     }
0517     /*
0518      * FC-LS states:
0519      * To explicitly Logout, the initiating Nx_Port shall terminate
0520      * other open Sequences that it initiated with the destination
0521      * Nx_Port prior to performing Logout.
0522      */
0523     lport->tt.exch_mgr_reset(lport, 0, port_id);
0524     lport->tt.exch_mgr_reset(lport, port_id, 0);
0525 
0526     fc_rport_enter_logo(rdata);
0527 
0528     /*
0529      * Change the state to Delete so that we discard
0530      * the response.
0531      */
0532     fc_rport_enter_delete(rdata, RPORT_EV_STOP);
0533 out:
0534     mutex_unlock(&rdata->rp_mutex);
0535     return 0;
0536 }
0537 EXPORT_SYMBOL(fc_rport_logoff);
0538 
0539 /**
0540  * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
0541  * @rdata: The remote port that is ready
0542  *
0543  * Reference counting: schedules workqueue, does not modify kref
0544  */
0545 static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
0546 {
0547     lockdep_assert_held(&rdata->rp_mutex);
0548 
0549     fc_rport_state_enter(rdata, RPORT_ST_READY);
0550 
0551     FC_RPORT_DBG(rdata, "Port is Ready\n");
0552 
0553     kref_get(&rdata->kref);
0554     if (rdata->event == RPORT_EV_NONE &&
0555         !queue_work(rport_event_queue, &rdata->event_work))
0556         kref_put(&rdata->kref, fc_rport_destroy);
0557 
0558     rdata->event = RPORT_EV_READY;
0559 }
0560 
0561 /**
0562  * fc_rport_timeout() - Handler for the retry_work timer
0563  * @work: Handle to the remote port that has timed out
0564  *
0565  * Locking Note: Called without the rport lock held. This
0566  * function will hold the rport lock, call an _enter_*
0567  * function and then unlock the rport.
0568  *
0569  * Reference counting: Drops kref on return.
0570  */
0571 static void fc_rport_timeout(struct work_struct *work)
0572 {
0573     struct fc_rport_priv *rdata =
0574         container_of(work, struct fc_rport_priv, retry_work.work);
0575 
0576     mutex_lock(&rdata->rp_mutex);
0577     FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata));
0578 
0579     switch (rdata->rp_state) {
0580     case RPORT_ST_FLOGI:
0581         fc_rport_enter_flogi(rdata);
0582         break;
0583     case RPORT_ST_PLOGI:
0584         fc_rport_enter_plogi(rdata);
0585         break;
0586     case RPORT_ST_PRLI:
0587         fc_rport_enter_prli(rdata);
0588         break;
0589     case RPORT_ST_RTV:
0590         fc_rport_enter_rtv(rdata);
0591         break;
0592     case RPORT_ST_ADISC:
0593         fc_rport_enter_adisc(rdata);
0594         break;
0595     case RPORT_ST_PLOGI_WAIT:
0596     case RPORT_ST_READY:
0597     case RPORT_ST_INIT:
0598     case RPORT_ST_DELETE:
0599         break;
0600     }
0601 
0602     mutex_unlock(&rdata->rp_mutex);
0603     kref_put(&rdata->kref, fc_rport_destroy);
0604 }
0605 
0606 /**
0607  * fc_rport_error() - Error handler, called once retries have been exhausted
0608  * @rdata: The remote port the error is happened on
0609  * @err:   The error code
0610  *
0611  * Reference counting: does not modify kref
0612  */
0613 static void fc_rport_error(struct fc_rport_priv *rdata, int err)
0614 {
0615     struct fc_lport *lport = rdata->local_port;
0616 
0617     lockdep_assert_held(&rdata->rp_mutex);
0618 
0619     FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n",
0620              -err, fc_rport_state(rdata), rdata->retries);
0621 
0622     switch (rdata->rp_state) {
0623     case RPORT_ST_FLOGI:
0624         rdata->flags &= ~FC_RP_STARTED;
0625         fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
0626         break;
0627     case RPORT_ST_PLOGI:
0628         if (lport->point_to_multipoint) {
0629             rdata->flags &= ~FC_RP_STARTED;
0630             fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
0631         } else
0632             fc_rport_enter_logo(rdata);
0633         break;
0634     case RPORT_ST_RTV:
0635         fc_rport_enter_ready(rdata);
0636         break;
0637     case RPORT_ST_PRLI:
0638         fc_rport_enter_plogi(rdata);
0639         break;
0640     case RPORT_ST_ADISC:
0641         fc_rport_enter_logo(rdata);
0642         break;
0643     case RPORT_ST_PLOGI_WAIT:
0644     case RPORT_ST_DELETE:
0645     case RPORT_ST_READY:
0646     case RPORT_ST_INIT:
0647         break;
0648     }
0649 }
0650 
0651 /**
0652  * fc_rport_error_retry() - Handler for remote port state retries
0653  * @rdata: The remote port whose state is to be retried
0654  * @err:   The error code
0655  *
0656  * If the error was an exchange timeout retry immediately,
0657  * otherwise wait for E_D_TOV.
0658  *
0659  * Reference counting: increments kref when scheduling retry_work
0660  */
0661 static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err)
0662 {
0663     unsigned long delay = msecs_to_jiffies(rdata->e_d_tov);
0664 
0665     lockdep_assert_held(&rdata->rp_mutex);
0666 
0667     /* make sure this isn't an FC_EX_CLOSED error, never retry those */
0668     if (err == -FC_EX_CLOSED)
0669         goto out;
0670 
0671     if (rdata->retries < rdata->local_port->max_rport_retry_count) {
0672         FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n",
0673                  err, fc_rport_state(rdata));
0674         rdata->retries++;
0675         /* no additional delay on exchange timeouts */
0676         if (err == -FC_EX_TIMEOUT)
0677             delay = 0;
0678         kref_get(&rdata->kref);
0679         if (!schedule_delayed_work(&rdata->retry_work, delay))
0680             kref_put(&rdata->kref, fc_rport_destroy);
0681         return;
0682     }
0683 
0684 out:
0685     fc_rport_error(rdata, err);
0686 }
0687 
0688 /**
0689  * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
0690  * @rdata:  The remote port which we logged into or which logged into us.
0691  * @fp:     The FLOGI or PLOGI request or response frame
0692  *
0693  * Returns non-zero error if a problem is detected with the frame.
0694  * Does not free the frame.
0695  *
0696  * This is only used in point-to-multipoint mode for FIP currently.
0697  */
0698 static int fc_rport_login_complete(struct fc_rport_priv *rdata,
0699                    struct fc_frame *fp)
0700 {
0701     struct fc_lport *lport = rdata->local_port;
0702     struct fc_els_flogi *flogi;
0703     unsigned int e_d_tov;
0704     u16 csp_flags;
0705 
0706     flogi = fc_frame_payload_get(fp, sizeof(*flogi));
0707     if (!flogi)
0708         return -EINVAL;
0709 
0710     csp_flags = ntohs(flogi->fl_csp.sp_features);
0711 
0712     if (fc_frame_payload_op(fp) == ELS_FLOGI) {
0713         if (csp_flags & FC_SP_FT_FPORT) {
0714             FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
0715             return -EINVAL;
0716         }
0717     } else {
0718 
0719         /*
0720          * E_D_TOV is not valid on an incoming FLOGI request.
0721          */
0722         e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
0723         if (csp_flags & FC_SP_FT_EDTR)
0724             e_d_tov /= 1000000;
0725         if (e_d_tov > rdata->e_d_tov)
0726             rdata->e_d_tov = e_d_tov;
0727     }
0728     rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
0729     return 0;
0730 }
0731 
0732 /**
0733  * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
0734  * @sp:     The sequence that the FLOGI was on
0735  * @fp:     The FLOGI response frame
0736  * @rp_arg: The remote port that received the FLOGI response
0737  */
0738 static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
0739                 void *rp_arg)
0740 {
0741     struct fc_rport_priv *rdata = rp_arg;
0742     struct fc_lport *lport = rdata->local_port;
0743     struct fc_els_flogi *flogi;
0744     unsigned int r_a_tov;
0745     u8 opcode;
0746     int err = 0;
0747 
0748     FC_RPORT_DBG(rdata, "Received a FLOGI %s\n",
0749              IS_ERR(fp) ? "error" : fc_els_resp_type(fp));
0750 
0751     if (fp == ERR_PTR(-FC_EX_CLOSED))
0752         goto put;
0753 
0754     mutex_lock(&rdata->rp_mutex);
0755 
0756     if (rdata->rp_state != RPORT_ST_FLOGI) {
0757         FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
0758                  "%s\n", fc_rport_state(rdata));
0759         if (IS_ERR(fp))
0760             goto err;
0761         goto out;
0762     }
0763 
0764     if (IS_ERR(fp)) {
0765         fc_rport_error(rdata, PTR_ERR(fp));
0766         goto err;
0767     }
0768     opcode = fc_frame_payload_op(fp);
0769     if (opcode == ELS_LS_RJT) {
0770         struct fc_els_ls_rjt *rjt;
0771 
0772         rjt = fc_frame_payload_get(fp, sizeof(*rjt));
0773         FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n",
0774                  rjt->er_reason, rjt->er_explan);
0775         err = -FC_EX_ELS_RJT;
0776         goto bad;
0777     } else if (opcode != ELS_LS_ACC) {
0778         FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode);
0779         err = -FC_EX_ELS_RJT;
0780         goto bad;
0781     }
0782     if (fc_rport_login_complete(rdata, fp)) {
0783         FC_RPORT_DBG(rdata, "FLOGI failed, no login\n");
0784         err = -FC_EX_INV_LOGIN;
0785         goto bad;
0786     }
0787 
0788     flogi = fc_frame_payload_get(fp, sizeof(*flogi));
0789     if (!flogi) {
0790         err = -FC_EX_ALLOC_ERR;
0791         goto bad;
0792     }
0793     r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
0794     if (r_a_tov > rdata->r_a_tov)
0795         rdata->r_a_tov = r_a_tov;
0796 
0797     if (rdata->ids.port_name < lport->wwpn)
0798         fc_rport_enter_plogi(rdata);
0799     else
0800         fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
0801 out:
0802     fc_frame_free(fp);
0803 err:
0804     mutex_unlock(&rdata->rp_mutex);
0805 put:
0806     kref_put(&rdata->kref, fc_rport_destroy);
0807     return;
0808 bad:
0809     FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
0810     fc_rport_error_retry(rdata, err);
0811     goto out;
0812 }
0813 
0814 /**
0815  * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
0816  * @rdata: The remote port to send a FLOGI to
0817  *
0818  * Reference counting: increments kref when sending ELS
0819  */
0820 static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
0821 {
0822     struct fc_lport *lport = rdata->local_port;
0823     struct fc_frame *fp;
0824 
0825     lockdep_assert_held(&rdata->rp_mutex);
0826 
0827     if (!lport->point_to_multipoint)
0828         return fc_rport_enter_plogi(rdata);
0829 
0830     FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
0831              fc_rport_state(rdata));
0832 
0833     fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
0834 
0835     fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
0836     if (!fp)
0837         return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
0838 
0839     kref_get(&rdata->kref);
0840     if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
0841                   fc_rport_flogi_resp, rdata,
0842                   2 * lport->r_a_tov)) {
0843         fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
0844         kref_put(&rdata->kref, fc_rport_destroy);
0845     }
0846 }
0847 
0848 /**
0849  * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
0850  * @lport: The local port that received the PLOGI request
0851  * @rx_fp: The PLOGI request frame
0852  *
0853  * Reference counting: drops kref on return
0854  */
0855 static void fc_rport_recv_flogi_req(struct fc_lport *lport,
0856                     struct fc_frame *rx_fp)
0857 {
0858     struct fc_els_flogi *flp;
0859     struct fc_rport_priv *rdata;
0860     struct fc_frame *fp = rx_fp;
0861     struct fc_seq_els_data rjt_data;
0862     u32 sid;
0863 
0864     sid = fc_frame_sid(fp);
0865 
0866     FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
0867 
0868     if (!lport->point_to_multipoint) {
0869         rjt_data.reason = ELS_RJT_UNSUP;
0870         rjt_data.explan = ELS_EXPL_NONE;
0871         goto reject;
0872     }
0873 
0874     flp = fc_frame_payload_get(fp, sizeof(*flp));
0875     if (!flp) {
0876         rjt_data.reason = ELS_RJT_LOGIC;
0877         rjt_data.explan = ELS_EXPL_INV_LEN;
0878         goto reject;
0879     }
0880 
0881     rdata = fc_rport_lookup(lport, sid);
0882     if (!rdata) {
0883         rjt_data.reason = ELS_RJT_FIP;
0884         rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
0885         goto reject;
0886     }
0887     mutex_lock(&rdata->rp_mutex);
0888 
0889     FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
0890              fc_rport_state(rdata));
0891 
0892     switch (rdata->rp_state) {
0893     case RPORT_ST_INIT:
0894         /*
0895          * If received the FLOGI request on RPORT which is INIT state
0896          * (means not transition to FLOGI either fc_rport timeout
0897          * function didn;t trigger or this end hasn;t received
0898          * beacon yet from other end. In that case only, allow RPORT
0899          * state machine to continue, otherwise fall through which
0900          * causes the code to send reject response.
0901          * NOTE; Not checking for FIP->state such as VNMP_UP or
0902          * VNMP_CLAIM because if FIP state is not one of those,
0903          * RPORT wouldn;t have created and 'rport_lookup' would have
0904          * failed anyway in that case.
0905          */
0906         break;
0907     case RPORT_ST_DELETE:
0908         mutex_unlock(&rdata->rp_mutex);
0909         rjt_data.reason = ELS_RJT_FIP;
0910         rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
0911         goto reject_put;
0912     case RPORT_ST_FLOGI:
0913     case RPORT_ST_PLOGI_WAIT:
0914     case RPORT_ST_PLOGI:
0915         break;
0916     case RPORT_ST_PRLI:
0917     case RPORT_ST_RTV:
0918     case RPORT_ST_READY:
0919     case RPORT_ST_ADISC:
0920         /*
0921          * Set the remote port to be deleted and to then restart.
0922          * This queues work to be sure exchanges are reset.
0923          */
0924         fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
0925         mutex_unlock(&rdata->rp_mutex);
0926         rjt_data.reason = ELS_RJT_BUSY;
0927         rjt_data.explan = ELS_EXPL_NONE;
0928         goto reject_put;
0929     }
0930     if (fc_rport_login_complete(rdata, fp)) {
0931         mutex_unlock(&rdata->rp_mutex);
0932         rjt_data.reason = ELS_RJT_LOGIC;
0933         rjt_data.explan = ELS_EXPL_NONE;
0934         goto reject_put;
0935     }
0936 
0937     fp = fc_frame_alloc(lport, sizeof(*flp));
0938     if (!fp)
0939         goto out;
0940 
0941     fc_flogi_fill(lport, fp);
0942     flp = fc_frame_payload_get(fp, sizeof(*flp));
0943     flp->fl_cmd = ELS_LS_ACC;
0944 
0945     fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
0946     lport->tt.frame_send(lport, fp);
0947 
0948     /*
0949      * Do not proceed with the state machine if our
0950      * FLOGI has crossed with an FLOGI from the
0951      * remote port; wait for the FLOGI response instead.
0952      */
0953     if (rdata->rp_state != RPORT_ST_FLOGI) {
0954         if (rdata->ids.port_name < lport->wwpn)
0955             fc_rport_enter_plogi(rdata);
0956         else
0957             fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
0958     }
0959 out:
0960     mutex_unlock(&rdata->rp_mutex);
0961     kref_put(&rdata->kref, fc_rport_destroy);
0962     fc_frame_free(rx_fp);
0963     return;
0964 
0965 reject_put:
0966     kref_put(&rdata->kref, fc_rport_destroy);
0967 reject:
0968     fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
0969     fc_frame_free(rx_fp);
0970 }
0971 
0972 /**
0973  * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
0974  * @sp:        The sequence the PLOGI is on
0975  * @fp:        The PLOGI response frame
0976  * @rdata_arg: The remote port that sent the PLOGI response
0977  *
0978  * Locking Note: This function will be called without the rport lock
0979  * held, but it will lock, call an _enter_* function or fc_rport_error
0980  * and then unlock the rport.
0981  */
0982 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
0983                 void *rdata_arg)
0984 {
0985     struct fc_rport_priv *rdata = rdata_arg;
0986     struct fc_lport *lport = rdata->local_port;
0987     struct fc_els_flogi *plp = NULL;
0988     u16 csp_seq;
0989     u16 cssp_seq;
0990     u8 op;
0991 
0992     FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
0993 
0994     if (fp == ERR_PTR(-FC_EX_CLOSED))
0995         goto put;
0996 
0997     mutex_lock(&rdata->rp_mutex);
0998 
0999     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);
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