Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2292 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
new file mode 100644
index 000000000..33da3c108
--- /dev/null
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -0,0 +1,2292 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * RPORT GENERAL INFO
+ *
+ * This file contains all processing regarding fc_rports. It contains the
+ * rport state machine and does all rport interaction with the transport class.
+ * There should be no other places in libfc that interact directly with the
+ * transport class in regards to adding and deleting rports.
+ *
+ * fc_rport's represent N_Port's within the fabric.
+ */
+
+/*
+ * RPORT LOCKING
+ *
+ * The rport should never hold the rport mutex and then attempt to acquire
+ * either the lport or disc mutexes. The rport's mutex is considered lesser
+ * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
+ * more comments on the hierarchy.
+ *
+ * The locking strategy is similar to the lport's strategy. The lock protects
+ * the rport's states and is held and released by the entry points to the rport
+ * block. All _enter_* functions correspond to rport states and expect the rport
+ * mutex to be locked before calling them. This means that rports only handle
+ * one request or response at a time, since they're not critical for the I/O
+ * path this potential over-use of the mutex is acceptable.
+ */
+
+/*
+ * RPORT REFERENCE COUNTING
+ *
+ * A rport reference should be taken when:
+ * - an rport is allocated
+ * - a workqueue item is scheduled
+ * - an ELS request is send
+ * The reference should be dropped when:
+ * - the workqueue function has finished
+ * - the ELS response is handled
+ * - an rport is removed
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/rcupdate.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <linux/export.h>
+#include <linux/rculist.h>
+
+#include <asm/unaligned.h>
+
+#include <scsi/libfc.h>
+
+#include "fc_encode.h"
+#include "fc_libfc.h"
+
+static struct workqueue_struct *rport_event_queue;
+
+static void fc_rport_enter_flogi(struct fc_rport_priv *);
+static void fc_rport_enter_plogi(struct fc_rport_priv *);
+static void fc_rport_enter_prli(struct fc_rport_priv *);
+static void fc_rport_enter_rtv(struct fc_rport_priv *);
+static void fc_rport_enter_ready(struct fc_rport_priv *);
+static void fc_rport_enter_logo(struct fc_rport_priv *);
+static void fc_rport_enter_adisc(struct fc_rport_priv *);
+
+static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
+static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
+static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
+static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
+static void fc_rport_timeout(struct work_struct *);
+static void fc_rport_error(struct fc_rport_priv *, int);
+static void fc_rport_error_retry(struct fc_rport_priv *, int);
+static void fc_rport_work(struct work_struct *);
+
+static const char *fc_rport_state_names[] = {
+	[RPORT_ST_INIT] = "Init",
+	[RPORT_ST_FLOGI] = "FLOGI",
+	[RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
+	[RPORT_ST_PLOGI] = "PLOGI",
+	[RPORT_ST_PRLI] = "PRLI",
+	[RPORT_ST_RTV] = "RTV",
+	[RPORT_ST_READY] = "Ready",
+	[RPORT_ST_ADISC] = "ADISC",
+	[RPORT_ST_DELETE] = "Delete",
+};
+
+/**
+ * fc_rport_lookup() - Lookup a remote port by port_id
+ * @lport:   The local port to lookup the remote port on
+ * @port_id: The remote port ID to look up
+ *
+ * The reference count of the fc_rport_priv structure is
+ * increased by one.
+ */
+struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
+				      u32 port_id)
+{
+	struct fc_rport_priv *rdata = NULL, *tmp_rdata;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
+		if (tmp_rdata->ids.port_id == port_id &&
+		    kref_get_unless_zero(&tmp_rdata->kref)) {
+			rdata = tmp_rdata;
+			break;
+		}
+	rcu_read_unlock();
+	return rdata;
+}
+EXPORT_SYMBOL(fc_rport_lookup);
+
+/**
+ * fc_rport_create() - Create a new remote port
+ * @lport: The local port this remote port will be associated with
+ * @port_id:   The identifiers for the new remote port
+ *
+ * The remote port will start in the INIT state.
+ */
+struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
+{
+	struct fc_rport_priv *rdata;
+	size_t rport_priv_size = sizeof(*rdata);
+
+	lockdep_assert_held(&lport->disc.disc_mutex);
+
+	rdata = fc_rport_lookup(lport, port_id);
+	if (rdata) {
+		kref_put(&rdata->kref, fc_rport_destroy);
+		return rdata;
+	}
+
+	if (lport->rport_priv_size > 0)
+		rport_priv_size = lport->rport_priv_size;
+	rdata = kzalloc(rport_priv_size, GFP_KERNEL);
+	if (!rdata)
+		return NULL;
+
+	rdata->ids.node_name = -1;
+	rdata->ids.port_name = -1;
+	rdata->ids.port_id = port_id;
+	rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+	kref_init(&rdata->kref);
+	mutex_init(&rdata->rp_mutex);
+	rdata->local_port = lport;
+	rdata->rp_state = RPORT_ST_INIT;
+	rdata->event = RPORT_EV_NONE;
+	rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+	rdata->e_d_tov = lport->e_d_tov;
+	rdata->r_a_tov = lport->r_a_tov;
+	rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
+	INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
+	INIT_WORK(&rdata->event_work, fc_rport_work);
+	if (port_id != FC_FID_DIR_SERV) {
+		rdata->lld_event_callback = lport->tt.rport_event_callback;
+		list_add_rcu(&rdata->peers, &lport->disc.rports);
+	}
+	return rdata;
+}
+EXPORT_SYMBOL(fc_rport_create);
+
+/**
+ * fc_rport_destroy() - Free a remote port after last reference is released
+ * @kref: The remote port's kref
+ */
+void fc_rport_destroy(struct kref *kref)
+{
+	struct fc_rport_priv *rdata;
+
+	rdata = container_of(kref, struct fc_rport_priv, kref);
+	kfree_rcu(rdata, rcu);
+}
+EXPORT_SYMBOL(fc_rport_destroy);
+
+/**
+ * fc_rport_state() - Return a string identifying the remote port's state
+ * @rdata: The remote port
+ */
+static const char *fc_rport_state(struct fc_rport_priv *rdata)
+{
+	const char *cp;
+
+	cp = fc_rport_state_names[rdata->rp_state];
+	if (!cp)
+		cp = "Unknown";
+	return cp;
+}
+
+/**
+ * fc_set_rport_loss_tmo() - Set the remote port loss timeout
+ * @rport:   The remote port that gets a new timeout value
+ * @timeout: The new timeout value (in seconds)
+ */
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+	if (timeout)
+		rport->dev_loss_tmo = timeout;
+	else
+		rport->dev_loss_tmo = 1;
+}
+EXPORT_SYMBOL(fc_set_rport_loss_tmo);
+
+/**
+ * fc_plogi_get_maxframe() - Get the maximum payload from the common service
+ *			     parameters in a FLOGI frame
+ * @flp:    The FLOGI or PLOGI payload
+ * @maxval: The maximum frame size upper limit; this may be less than what
+ *	    is in the service parameters
+ */
+static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
+					  unsigned int maxval)
+{
+	unsigned int mfs;
+
+	/*
+	 * Get max payload from the common service parameters and the
+	 * class 3 receive data field size.
+	 */
+	mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
+	if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+		maxval = mfs;
+	mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
+	if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+		maxval = mfs;
+	return maxval;
+}
+
+/**
+ * fc_rport_state_enter() - Change the state of a remote port
+ * @rdata: The remote port whose state should change
+ * @new:   The new state
+ */
+static void fc_rport_state_enter(struct fc_rport_priv *rdata,
+				 enum fc_rport_state new)
+{
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	if (rdata->rp_state != new)
+		rdata->retries = 0;
+	rdata->rp_state = new;
+}
+
+/**
+ * fc_rport_work() - Handler for remote port events in the rport_event_queue
+ * @work: Handle to the remote port being dequeued
+ *
+ * Reference counting: drops kref on return
+ */
+static void fc_rport_work(struct work_struct *work)
+{
+	u32 port_id;
+	struct fc_rport_priv *rdata =
+		container_of(work, struct fc_rport_priv, event_work);
+	struct fc_rport_libfc_priv *rpriv;
+	enum fc_rport_event event;
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_rport_operations *rport_ops;
+	struct fc_rport_identifiers ids;
+	struct fc_rport *rport;
+	struct fc4_prov *prov;
+	u8 type;
+
+	mutex_lock(&rdata->rp_mutex);
+	event = rdata->event;
+	rport_ops = rdata->ops;
+	rport = rdata->rport;
+
+	FC_RPORT_DBG(rdata, "work event %u\n", event);
+
+	switch (event) {
+	case RPORT_EV_READY:
+		ids = rdata->ids;
+		rdata->event = RPORT_EV_NONE;
+		rdata->major_retries = 0;
+		kref_get(&rdata->kref);
+		mutex_unlock(&rdata->rp_mutex);
+
+		if (!rport) {
+			FC_RPORT_DBG(rdata, "No rport!\n");
+			rport = fc_remote_port_add(lport->host, 0, &ids);
+		}
+		if (!rport) {
+			FC_RPORT_DBG(rdata, "Failed to add the rport\n");
+			fc_rport_logoff(rdata);
+			kref_put(&rdata->kref, fc_rport_destroy);
+			return;
+		}
+		mutex_lock(&rdata->rp_mutex);
+		if (rdata->rport)
+			FC_RPORT_DBG(rdata, "rport already allocated\n");
+		rdata->rport = rport;
+		rport->maxframe_size = rdata->maxframe_size;
+		rport->supported_classes = rdata->supported_classes;
+
+		rpriv = rport->dd_data;
+		rpriv->local_port = lport;
+		rpriv->rp_state = rdata->rp_state;
+		rpriv->flags = rdata->flags;
+		rpriv->e_d_tov = rdata->e_d_tov;
+		rpriv->r_a_tov = rdata->r_a_tov;
+		mutex_unlock(&rdata->rp_mutex);
+
+		if (rport_ops && rport_ops->event_callback) {
+			FC_RPORT_DBG(rdata, "callback ev %d\n", event);
+			rport_ops->event_callback(lport, rdata, event);
+		}
+		if (rdata->lld_event_callback) {
+			FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
+			rdata->lld_event_callback(lport, rdata, event);
+		}
+		kref_put(&rdata->kref, fc_rport_destroy);
+		break;
+
+	case RPORT_EV_FAILED:
+	case RPORT_EV_LOGO:
+	case RPORT_EV_STOP:
+		if (rdata->prli_count) {
+			mutex_lock(&fc_prov_mutex);
+			for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
+				prov = fc_passive_prov[type];
+				if (prov && prov->prlo)
+					prov->prlo(rdata);
+			}
+			mutex_unlock(&fc_prov_mutex);
+		}
+		port_id = rdata->ids.port_id;
+		mutex_unlock(&rdata->rp_mutex);
+
+		if (rport_ops && rport_ops->event_callback) {
+			FC_RPORT_DBG(rdata, "callback ev %d\n", event);
+			rport_ops->event_callback(lport, rdata, event);
+		}
+		if (rdata->lld_event_callback) {
+			FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
+			rdata->lld_event_callback(lport, rdata, event);
+		}
+		if (cancel_delayed_work_sync(&rdata->retry_work))
+			kref_put(&rdata->kref, fc_rport_destroy);
+
+		/*
+		 * Reset any outstanding exchanges before freeing rport.
+		 */
+		lport->tt.exch_mgr_reset(lport, 0, port_id);
+		lport->tt.exch_mgr_reset(lport, port_id, 0);
+
+		if (rport) {
+			rpriv = rport->dd_data;
+			rpriv->rp_state = RPORT_ST_DELETE;
+			mutex_lock(&rdata->rp_mutex);
+			rdata->rport = NULL;
+			mutex_unlock(&rdata->rp_mutex);
+			fc_remote_port_delete(rport);
+		}
+
+		mutex_lock(&rdata->rp_mutex);
+		if (rdata->rp_state == RPORT_ST_DELETE) {
+			if (port_id == FC_FID_DIR_SERV) {
+				rdata->event = RPORT_EV_NONE;
+				mutex_unlock(&rdata->rp_mutex);
+				kref_put(&rdata->kref, fc_rport_destroy);
+			} else if ((rdata->flags & FC_RP_STARTED) &&
+				   rdata->major_retries <
+				   lport->max_rport_retry_count) {
+				rdata->major_retries++;
+				rdata->event = RPORT_EV_NONE;
+				FC_RPORT_DBG(rdata, "work restart\n");
+				fc_rport_enter_flogi(rdata);
+				mutex_unlock(&rdata->rp_mutex);
+			} else {
+				mutex_unlock(&rdata->rp_mutex);
+				FC_RPORT_DBG(rdata, "work delete\n");
+				mutex_lock(&lport->disc.disc_mutex);
+				list_del_rcu(&rdata->peers);
+				mutex_unlock(&lport->disc.disc_mutex);
+				kref_put(&rdata->kref, fc_rport_destroy);
+			}
+		} else {
+			/*
+			 * Re-open for events.  Reissue READY event if ready.
+			 */
+			rdata->event = RPORT_EV_NONE;
+			if (rdata->rp_state == RPORT_ST_READY) {
+				FC_RPORT_DBG(rdata, "work reopen\n");
+				fc_rport_enter_ready(rdata);
+			}
+			mutex_unlock(&rdata->rp_mutex);
+		}
+		break;
+
+	default:
+		mutex_unlock(&rdata->rp_mutex);
+		break;
+	}
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_login() - Start the remote port login state machine
+ * @rdata: The remote port to be logged in to
+ *
+ * Initiates the RP state machine. It is called from the LP module.
+ * This function will issue the following commands to the N_Port
+ * identified by the FC ID provided.
+ *
+ * - PLOGI
+ * - PRLI
+ * - RTV
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ *
+ * This indicates the intent to be logged into the remote port.
+ * If it appears we are already logged in, ADISC is used to verify
+ * the setup.
+ */
+int fc_rport_login(struct fc_rport_priv *rdata)
+{
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->flags & FC_RP_STARTED) {
+		FC_RPORT_DBG(rdata, "port already started\n");
+		mutex_unlock(&rdata->rp_mutex);
+		return 0;
+	}
+
+	rdata->flags |= FC_RP_STARTED;
+	switch (rdata->rp_state) {
+	case RPORT_ST_READY:
+		FC_RPORT_DBG(rdata, "ADISC port\n");
+		fc_rport_enter_adisc(rdata);
+		break;
+	case RPORT_ST_DELETE:
+		FC_RPORT_DBG(rdata, "Restart deleted port\n");
+		break;
+	case RPORT_ST_INIT:
+		FC_RPORT_DBG(rdata, "Login to port\n");
+		fc_rport_enter_flogi(rdata);
+		break;
+	default:
+		FC_RPORT_DBG(rdata, "Login in progress, state %s\n",
+			     fc_rport_state(rdata));
+		break;
+	}
+	mutex_unlock(&rdata->rp_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL(fc_rport_login);
+
+/**
+ * fc_rport_enter_delete() - Schedule a remote port to be deleted
+ * @rdata: The remote port to be deleted
+ * @event: The event to report as the reason for deletion
+ *
+ * Allow state change into DELETE only once.
+ *
+ * Call queue_work only if there's no event already pending.
+ * Set the new event so that the old pending event will not occur.
+ * Since we have the mutex, even if fc_rport_work() is already started,
+ * it'll see the new event.
+ *
+ * Reference counting: does not modify kref
+ */
+static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
+				  enum fc_rport_event event)
+{
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	if (rdata->rp_state == RPORT_ST_DELETE)
+		return;
+
+	FC_RPORT_DBG(rdata, "Delete port\n");
+
+	fc_rport_state_enter(rdata, RPORT_ST_DELETE);
+
+	if (rdata->event == RPORT_EV_NONE) {
+		kref_get(&rdata->kref);
+		if (!queue_work(rport_event_queue, &rdata->event_work))
+			kref_put(&rdata->kref, fc_rport_destroy);
+	}
+
+	rdata->event = event;
+}
+
+/**
+ * fc_rport_logoff() - Logoff and remove a remote port
+ * @rdata: The remote port to be logged off of
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_logoff(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	u32 port_id = rdata->ids.port_id;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Remove port\n");
+
+	rdata->flags &= ~FC_RP_STARTED;
+	if (rdata->rp_state == RPORT_ST_DELETE) {
+		FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
+		goto out;
+	}
+	/*
+	 * FC-LS states:
+	 * To explicitly Logout, the initiating Nx_Port shall terminate
+	 * other open Sequences that it initiated with the destination
+	 * Nx_Port prior to performing Logout.
+	 */
+	lport->tt.exch_mgr_reset(lport, 0, port_id);
+	lport->tt.exch_mgr_reset(lport, port_id, 0);
+
+	fc_rport_enter_logo(rdata);
+
+	/*
+	 * Change the state to Delete so that we discard
+	 * the response.
+	 */
+	fc_rport_enter_delete(rdata, RPORT_EV_STOP);
+out:
+	mutex_unlock(&rdata->rp_mutex);
+	return 0;
+}
+EXPORT_SYMBOL(fc_rport_logoff);
+
+/**
+ * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
+ * @rdata: The remote port that is ready
+ *
+ * Reference counting: schedules workqueue, does not modify kref
+ */
+static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
+{
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	fc_rport_state_enter(rdata, RPORT_ST_READY);
+
+	FC_RPORT_DBG(rdata, "Port is Ready\n");
+
+	kref_get(&rdata->kref);
+	if (rdata->event == RPORT_EV_NONE &&
+	    !queue_work(rport_event_queue, &rdata->event_work))
+		kref_put(&rdata->kref, fc_rport_destroy);
+
+	rdata->event = RPORT_EV_READY;
+}
+
+/**
+ * fc_rport_timeout() - Handler for the retry_work timer
+ * @work: Handle to the remote port that has timed out
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ *
+ * Reference counting: Drops kref on return.
+ */
+static void fc_rport_timeout(struct work_struct *work)
+{
+	struct fc_rport_priv *rdata =
+		container_of(work, struct fc_rport_priv, retry_work.work);
+
+	mutex_lock(&rdata->rp_mutex);
+	FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata));
+
+	switch (rdata->rp_state) {
+	case RPORT_ST_FLOGI:
+		fc_rport_enter_flogi(rdata);
+		break;
+	case RPORT_ST_PLOGI:
+		fc_rport_enter_plogi(rdata);
+		break;
+	case RPORT_ST_PRLI:
+		fc_rport_enter_prli(rdata);
+		break;
+	case RPORT_ST_RTV:
+		fc_rport_enter_rtv(rdata);
+		break;
+	case RPORT_ST_ADISC:
+		fc_rport_enter_adisc(rdata);
+		break;
+	case RPORT_ST_PLOGI_WAIT:
+	case RPORT_ST_READY:
+	case RPORT_ST_INIT:
+	case RPORT_ST_DELETE:
+		break;
+	}
+
+	mutex_unlock(&rdata->rp_mutex);
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_error() - Error handler, called once retries have been exhausted
+ * @rdata: The remote port the error is happened on
+ * @err:   The error code
+ *
+ * Reference counting: does not modify kref
+ */
+static void fc_rport_error(struct fc_rport_priv *rdata, int err)
+{
+	struct fc_lport *lport = rdata->local_port;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n",
+		     -err, fc_rport_state(rdata), rdata->retries);
+
+	switch (rdata->rp_state) {
+	case RPORT_ST_FLOGI:
+		rdata->flags &= ~FC_RP_STARTED;
+		fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
+		break;
+	case RPORT_ST_PLOGI:
+		if (lport->point_to_multipoint) {
+			rdata->flags &= ~FC_RP_STARTED;
+			fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
+		} else
+			fc_rport_enter_logo(rdata);
+		break;
+	case RPORT_ST_RTV:
+		fc_rport_enter_ready(rdata);
+		break;
+	case RPORT_ST_PRLI:
+		fc_rport_enter_plogi(rdata);
+		break;
+	case RPORT_ST_ADISC:
+		fc_rport_enter_logo(rdata);
+		break;
+	case RPORT_ST_PLOGI_WAIT:
+	case RPORT_ST_DELETE:
+	case RPORT_ST_READY:
+	case RPORT_ST_INIT:
+		break;
+	}
+}
+
+/**
+ * fc_rport_error_retry() - Handler for remote port state retries
+ * @rdata: The remote port whose state is to be retried
+ * @err:   The error code
+ *
+ * If the error was an exchange timeout retry immediately,
+ * otherwise wait for E_D_TOV.
+ *
+ * Reference counting: increments kref when scheduling retry_work
+ */
+static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err)
+{
+	unsigned long delay = msecs_to_jiffies(rdata->e_d_tov);
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	/* make sure this isn't an FC_EX_CLOSED error, never retry those */
+	if (err == -FC_EX_CLOSED)
+		goto out;
+
+	if (rdata->retries < rdata->local_port->max_rport_retry_count) {
+		FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n",
+			     err, fc_rport_state(rdata));
+		rdata->retries++;
+		/* no additional delay on exchange timeouts */
+		if (err == -FC_EX_TIMEOUT)
+			delay = 0;
+		kref_get(&rdata->kref);
+		if (!schedule_delayed_work(&rdata->retry_work, delay))
+			kref_put(&rdata->kref, fc_rport_destroy);
+		return;
+	}
+
+out:
+	fc_rport_error(rdata, err);
+}
+
+/**
+ * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
+ * @rdata:  The remote port which we logged into or which logged into us.
+ * @fp:     The FLOGI or PLOGI request or response frame
+ *
+ * Returns non-zero error if a problem is detected with the frame.
+ * Does not free the frame.
+ *
+ * This is only used in point-to-multipoint mode for FIP currently.
+ */
+static int fc_rport_login_complete(struct fc_rport_priv *rdata,
+				   struct fc_frame *fp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_els_flogi *flogi;
+	unsigned int e_d_tov;
+	u16 csp_flags;
+
+	flogi = fc_frame_payload_get(fp, sizeof(*flogi));
+	if (!flogi)
+		return -EINVAL;
+
+	csp_flags = ntohs(flogi->fl_csp.sp_features);
+
+	if (fc_frame_payload_op(fp) == ELS_FLOGI) {
+		if (csp_flags & FC_SP_FT_FPORT) {
+			FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
+			return -EINVAL;
+		}
+	} else {
+
+		/*
+		 * E_D_TOV is not valid on an incoming FLOGI request.
+		 */
+		e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
+		if (csp_flags & FC_SP_FT_EDTR)
+			e_d_tov /= 1000000;
+		if (e_d_tov > rdata->e_d_tov)
+			rdata->e_d_tov = e_d_tov;
+	}
+	rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
+	return 0;
+}
+
+/**
+ * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
+ * @sp:	    The sequence that the FLOGI was on
+ * @fp:	    The FLOGI response frame
+ * @rp_arg: The remote port that received the FLOGI response
+ */
+static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rp_arg)
+{
+	struct fc_rport_priv *rdata = rp_arg;
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_els_flogi *flogi;
+	unsigned int r_a_tov;
+	u8 opcode;
+	int err = 0;
+
+	FC_RPORT_DBG(rdata, "Received a FLOGI %s\n",
+		     IS_ERR(fp) ? "error" : fc_els_resp_type(fp));
+
+	if (fp == ERR_PTR(-FC_EX_CLOSED))
+		goto put;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->rp_state != RPORT_ST_FLOGI) {
+		FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
+			     "%s\n", fc_rport_state(rdata));
+		if (IS_ERR(fp))
+			goto err;
+		goto out;
+	}
+
+	if (IS_ERR(fp)) {
+		fc_rport_error(rdata, PTR_ERR(fp));
+		goto err;
+	}
+	opcode = fc_frame_payload_op(fp);
+	if (opcode == ELS_LS_RJT) {
+		struct fc_els_ls_rjt *rjt;
+
+		rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+		FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n",
+			     rjt->er_reason, rjt->er_explan);
+		err = -FC_EX_ELS_RJT;
+		goto bad;
+	} else if (opcode != ELS_LS_ACC) {
+		FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode);
+		err = -FC_EX_ELS_RJT;
+		goto bad;
+	}
+	if (fc_rport_login_complete(rdata, fp)) {
+		FC_RPORT_DBG(rdata, "FLOGI failed, no login\n");
+		err = -FC_EX_INV_LOGIN;
+		goto bad;
+	}
+
+	flogi = fc_frame_payload_get(fp, sizeof(*flogi));
+	if (!flogi) {
+		err = -FC_EX_ALLOC_ERR;
+		goto bad;
+	}
+	r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
+	if (r_a_tov > rdata->r_a_tov)
+		rdata->r_a_tov = r_a_tov;
+
+	if (rdata->ids.port_name < lport->wwpn)
+		fc_rport_enter_plogi(rdata);
+	else
+		fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
+out:
+	fc_frame_free(fp);
+err:
+	mutex_unlock(&rdata->rp_mutex);
+put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+	return;
+bad:
+	FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
+	fc_rport_error_retry(rdata, err);
+	goto out;
+}
+
+/**
+ * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
+ * @rdata: The remote port to send a FLOGI to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	if (!lport->point_to_multipoint)
+		return fc_rport_enter_plogi(rdata);
+
+	FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
+		     fc_rport_state(rdata));
+
+	fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
+	if (!fp)
+		return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
+
+	kref_get(&rdata->kref);
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
+				  fc_rport_flogi_resp, rdata,
+				  2 * lport->r_a_tov)) {
+		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	}
+}
+
+/**
+ * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
+ * @lport: The local port that received the PLOGI request
+ * @rx_fp: The PLOGI request frame
+ *
+ * Reference counting: drops kref on return
+ */
+static void fc_rport_recv_flogi_req(struct fc_lport *lport,
+				    struct fc_frame *rx_fp)
+{
+	struct fc_els_flogi *flp;
+	struct fc_rport_priv *rdata;
+	struct fc_frame *fp = rx_fp;
+	struct fc_seq_els_data rjt_data;
+	u32 sid;
+
+	sid = fc_frame_sid(fp);
+
+	FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
+
+	if (!lport->point_to_multipoint) {
+		rjt_data.reason = ELS_RJT_UNSUP;
+		rjt_data.explan = ELS_EXPL_NONE;
+		goto reject;
+	}
+
+	flp = fc_frame_payload_get(fp, sizeof(*flp));
+	if (!flp) {
+		rjt_data.reason = ELS_RJT_LOGIC;
+		rjt_data.explan = ELS_EXPL_INV_LEN;
+		goto reject;
+	}
+
+	rdata = fc_rport_lookup(lport, sid);
+	if (!rdata) {
+		rjt_data.reason = ELS_RJT_FIP;
+		rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
+		goto reject;
+	}
+	mutex_lock(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
+		     fc_rport_state(rdata));
+
+	switch (rdata->rp_state) {
+	case RPORT_ST_INIT:
+		/*
+		 * If received the FLOGI request on RPORT which is INIT state
+		 * (means not transition to FLOGI either fc_rport timeout
+		 * function didn;t trigger or this end hasn;t received
+		 * beacon yet from other end. In that case only, allow RPORT
+		 * state machine to continue, otherwise fall through which
+		 * causes the code to send reject response.
+		 * NOTE; Not checking for FIP->state such as VNMP_UP or
+		 * VNMP_CLAIM because if FIP state is not one of those,
+		 * RPORT wouldn;t have created and 'rport_lookup' would have
+		 * failed anyway in that case.
+		 */
+		break;
+	case RPORT_ST_DELETE:
+		mutex_unlock(&rdata->rp_mutex);
+		rjt_data.reason = ELS_RJT_FIP;
+		rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
+		goto reject_put;
+	case RPORT_ST_FLOGI:
+	case RPORT_ST_PLOGI_WAIT:
+	case RPORT_ST_PLOGI:
+		break;
+	case RPORT_ST_PRLI:
+	case RPORT_ST_RTV:
+	case RPORT_ST_READY:
+	case RPORT_ST_ADISC:
+		/*
+		 * Set the remote port to be deleted and to then restart.
+		 * This queues work to be sure exchanges are reset.
+		 */
+		fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
+		mutex_unlock(&rdata->rp_mutex);
+		rjt_data.reason = ELS_RJT_BUSY;
+		rjt_data.explan = ELS_EXPL_NONE;
+		goto reject_put;
+	}
+	if (fc_rport_login_complete(rdata, fp)) {
+		mutex_unlock(&rdata->rp_mutex);
+		rjt_data.reason = ELS_RJT_LOGIC;
+		rjt_data.explan = ELS_EXPL_NONE;
+		goto reject_put;
+	}
+
+	fp = fc_frame_alloc(lport, sizeof(*flp));
+	if (!fp)
+		goto out;
+
+	fc_flogi_fill(lport, fp);
+	flp = fc_frame_payload_get(fp, sizeof(*flp));
+	flp->fl_cmd = ELS_LS_ACC;
+
+	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+
+	/*
+	 * Do not proceed with the state machine if our
+	 * FLOGI has crossed with an FLOGI from the
+	 * remote port; wait for the FLOGI response instead.
+	 */
+	if (rdata->rp_state != RPORT_ST_FLOGI) {
+		if (rdata->ids.port_name < lport->wwpn)
+			fc_rport_enter_plogi(rdata);
+		else
+			fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
+	}
+out:
+	mutex_unlock(&rdata->rp_mutex);
+	kref_put(&rdata->kref, fc_rport_destroy);
+	fc_frame_free(rx_fp);
+	return;
+
+reject_put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+reject:
+	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
+	fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
+ * @sp:	       The sequence the PLOGI is on
+ * @fp:	       The PLOGI response frame
+ * @rdata_arg: The remote port that sent the PLOGI response
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rdata_arg)
+{
+	struct fc_rport_priv *rdata = rdata_arg;
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_els_flogi *plp = NULL;
+	u16 csp_seq;
+	u16 cssp_seq;
+	u8 op;
+
+	FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
+
+	if (fp == ERR_PTR(-FC_EX_CLOSED))
+		goto put;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->rp_state != RPORT_ST_PLOGI) {
+		FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
+			     "%s\n", fc_rport_state(rdata));
+		if (IS_ERR(fp))
+			goto err;
+		goto out;
+	}
+
+	if (IS_ERR(fp)) {
+		fc_rport_error_retry(rdata, PTR_ERR(fp));
+		goto err;
+	}
+
+	op = fc_frame_payload_op(fp);
+	if (op == ELS_LS_ACC &&
+	    (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
+		rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
+		rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
+
+		/* save plogi response sp_features for further reference */
+		rdata->sp_features = ntohs(plp->fl_csp.sp_features);
+
+		if (lport->point_to_multipoint)
+			fc_rport_login_complete(rdata, fp);
+		csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
+		cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
+		if (cssp_seq < csp_seq)
+			csp_seq = cssp_seq;
+		rdata->max_seq = csp_seq;
+		rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
+		fc_rport_enter_prli(rdata);
+	} else {
+		struct fc_els_ls_rjt *rjt;
+
+		rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+		if (!rjt)
+			FC_RPORT_DBG(rdata, "PLOGI bad response\n");
+		else
+			FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n",
+				     rjt->er_reason, rjt->er_explan);
+		fc_rport_error_retry(rdata, -FC_EX_ELS_RJT);
+	}
+out:
+	fc_frame_free(fp);
+err:
+	mutex_unlock(&rdata->rp_mutex);
+put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+static bool
+fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata)
+{
+	if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN)
+		return true;
+	if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) &&
+	    (lport->service_params & FCP_SPPF_INIT_FCN))
+		return true;
+	if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) &&
+	    (lport->service_params & FCP_SPPF_TARG_FCN))
+		return true;
+	return false;
+}
+
+/**
+ * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
+ * @rdata: The remote port to send a PLOGI to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	if (!fc_rport_compatible_roles(lport, rdata)) {
+		FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n");
+		fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
+		return;
+	}
+
+	FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
+		     fc_rport_state(rdata));
+
+	fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
+
+	rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
+	fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
+	if (!fp) {
+		FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
+		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
+		return;
+	}
+	rdata->e_d_tov = lport->e_d_tov;
+
+	kref_get(&rdata->kref);
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
+				  fc_rport_plogi_resp, rdata,
+				  2 * lport->r_a_tov)) {
+		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	}
+}
+
+/**
+ * fc_rport_prli_resp() - Process Login (PRLI) response handler
+ * @sp:	       The sequence the PRLI response was on
+ * @fp:	       The PRLI response frame
+ * @rdata_arg: The remote port that sent the PRLI response
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
+			       void *rdata_arg)
+{
+	struct fc_rport_priv *rdata = rdata_arg;
+	struct {
+		struct fc_els_prli prli;
+		struct fc_els_spp spp;
+	} *pp;
+	struct fc_els_spp temp_spp;
+	struct fc_els_ls_rjt *rjt;
+	struct fc4_prov *prov;
+	u32 roles = FC_RPORT_ROLE_UNKNOWN;
+	u32 fcp_parm = 0;
+	u8 op;
+	enum fc_els_spp_resp resp_code;
+
+	FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
+
+	if (fp == ERR_PTR(-FC_EX_CLOSED))
+		goto put;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->rp_state != RPORT_ST_PRLI) {
+		FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
+			     "%s\n", fc_rport_state(rdata));
+		if (IS_ERR(fp))
+			goto err;
+		goto out;
+	}
+
+	if (IS_ERR(fp)) {
+		fc_rport_error_retry(rdata, PTR_ERR(fp));
+		goto err;
+	}
+
+	/* reinitialize remote port roles */
+	rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+	op = fc_frame_payload_op(fp);
+	if (op == ELS_LS_ACC) {
+		pp = fc_frame_payload_get(fp, sizeof(*pp));
+		if (!pp) {
+			fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
+			goto out;
+		}
+
+		resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
+		FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n",
+			     pp->spp.spp_flags, pp->spp.spp_type);
+
+		rdata->spp_type = pp->spp.spp_type;
+		if (resp_code != FC_SPP_RESP_ACK) {
+			if (resp_code == FC_SPP_RESP_CONF)
+				fc_rport_error(rdata, -FC_EX_SEQ_ERR);
+			else
+				fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
+			goto out;
+		}
+		if (pp->prli.prli_spp_len < sizeof(pp->spp)) {
+			fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
+			goto out;
+		}
+
+		fcp_parm = ntohl(pp->spp.spp_params);
+		if (fcp_parm & FCP_SPPF_RETRY)
+			rdata->flags |= FC_RP_FLAGS_RETRY;
+		if (fcp_parm & FCP_SPPF_CONF_COMPL)
+			rdata->flags |= FC_RP_FLAGS_CONF_REQ;
+
+		/*
+		 * Call prli provider if we should act as a target
+		 */
+		if (rdata->spp_type < FC_FC4_PROV_SIZE) {
+			prov = fc_passive_prov[rdata->spp_type];
+			if (prov) {
+				memset(&temp_spp, 0, sizeof(temp_spp));
+				prov->prli(rdata, pp->prli.prli_spp_len,
+					   &pp->spp, &temp_spp);
+			}
+		}
+		/*
+		 * Check if the image pair could be established
+		 */
+		if (rdata->spp_type != FC_TYPE_FCP ||
+		    !(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) {
+			/*
+			 * Nope; we can't use this port as a target.
+			 */
+			fcp_parm &= ~FCP_SPPF_TARG_FCN;
+		}
+		rdata->supported_classes = FC_COS_CLASS3;
+		if (fcp_parm & FCP_SPPF_INIT_FCN)
+			roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+		if (fcp_parm & FCP_SPPF_TARG_FCN)
+			roles |= FC_RPORT_ROLE_FCP_TARGET;
+
+		rdata->ids.roles = roles;
+		fc_rport_enter_rtv(rdata);
+
+	} else {
+		rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+		if (!rjt)
+			FC_RPORT_DBG(rdata, "PRLI bad response\n");
+		else {
+			FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n",
+				     rjt->er_reason, rjt->er_explan);
+			if (rjt->er_reason == ELS_RJT_UNAB &&
+			    rjt->er_explan == ELS_EXPL_PLOGI_REQD) {
+				fc_rport_enter_plogi(rdata);
+				goto out;
+			}
+		}
+		fc_rport_error_retry(rdata, FC_EX_ELS_RJT);
+	}
+
+out:
+	fc_frame_free(fp);
+err:
+	mutex_unlock(&rdata->rp_mutex);
+put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_enter_prli() - Send Process Login (PRLI) request
+ * @rdata: The remote port to send the PRLI request to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct {
+		struct fc_els_prli prli;
+		struct fc_els_spp spp;
+	} *pp;
+	struct fc_frame *fp;
+	struct fc4_prov *prov;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	/*
+	 * If the rport is one of the well known addresses
+	 * we skip PRLI and RTV and go straight to READY.
+	 */
+	if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
+		fc_rport_enter_ready(rdata);
+		return;
+	}
+
+	/*
+	 * And if the local port does not support the initiator function
+	 * there's no need to send a PRLI, either.
+	 */
+	if (!(lport->service_params & FCP_SPPF_INIT_FCN)) {
+		    fc_rport_enter_ready(rdata);
+		    return;
+	}
+
+	FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
+		     fc_rport_state(rdata));
+
+	fc_rport_state_enter(rdata, RPORT_ST_PRLI);
+
+	fp = fc_frame_alloc(lport, sizeof(*pp));
+	if (!fp) {
+		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
+		return;
+	}
+
+	fc_prli_fill(lport, fp);
+
+	prov = fc_passive_prov[FC_TYPE_FCP];
+	if (prov) {
+		pp = fc_frame_payload_get(fp, sizeof(*pp));
+		prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
+	}
+
+	fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
+		       fc_host_port_id(lport->host), FC_TYPE_ELS,
+		       FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+	kref_get(&rdata->kref);
+	if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp,
+			      NULL, rdata, 2 * lport->r_a_tov)) {
+		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	}
+}
+
+/**
+ * fc_rport_rtv_resp() - Handler for Request Timeout Value (RTV) responses
+ * @sp:	       The sequence the RTV was on
+ * @fp:	       The RTV response frame
+ * @rdata_arg: The remote port that sent the RTV response
+ *
+ * Many targets don't seem to support this.
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
+			      void *rdata_arg)
+{
+	struct fc_rport_priv *rdata = rdata_arg;
+	u8 op;
+
+	FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
+
+	if (fp == ERR_PTR(-FC_EX_CLOSED))
+		goto put;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->rp_state != RPORT_ST_RTV) {
+		FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
+			     "%s\n", fc_rport_state(rdata));
+		if (IS_ERR(fp))
+			goto err;
+		goto out;
+	}
+
+	if (IS_ERR(fp)) {
+		fc_rport_error(rdata, PTR_ERR(fp));
+		goto err;
+	}
+
+	op = fc_frame_payload_op(fp);
+	if (op == ELS_LS_ACC) {
+		struct fc_els_rtv_acc *rtv;
+		u32 toq;
+		u32 tov;
+
+		rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+		if (rtv) {
+			toq = ntohl(rtv->rtv_toq);
+			tov = ntohl(rtv->rtv_r_a_tov);
+			if (tov == 0)
+				tov = 1;
+			if (tov > rdata->r_a_tov)
+				rdata->r_a_tov = tov;
+			tov = ntohl(rtv->rtv_e_d_tov);
+			if (toq & FC_ELS_RTV_EDRES)
+				tov /= 1000000;
+			if (tov == 0)
+				tov = 1;
+			if (tov > rdata->e_d_tov)
+				rdata->e_d_tov = tov;
+		}
+	}
+
+	fc_rport_enter_ready(rdata);
+
+out:
+	fc_frame_free(fp);
+err:
+	mutex_unlock(&rdata->rp_mutex);
+put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
+ * @rdata: The remote port to send the RTV request to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
+{
+	struct fc_frame *fp;
+	struct fc_lport *lport = rdata->local_port;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
+		     fc_rport_state(rdata));
+
+	fc_rport_state_enter(rdata, RPORT_ST_RTV);
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
+	if (!fp) {
+		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
+		return;
+	}
+
+	kref_get(&rdata->kref);
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
+				  fc_rport_rtv_resp, rdata,
+				  2 * lport->r_a_tov)) {
+		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	}
+}
+
+/**
+ * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests
+ * @rdata: The remote port that sent the RTV request
+ * @in_fp: The RTV request frame
+ */
+static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata,
+				  struct fc_frame *in_fp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+	struct fc_els_rtv_acc *rtv;
+	struct fc_seq_els_data rjt_data;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+	lockdep_assert_held(&lport->lp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received RTV request\n");
+
+	fp = fc_frame_alloc(lport, sizeof(*rtv));
+	if (!fp) {
+		rjt_data.reason = ELS_RJT_UNAB;
+		rjt_data.explan = ELS_EXPL_INSUF_RES;
+		fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
+		goto drop;
+	}
+	rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+	rtv->rtv_cmd = ELS_LS_ACC;
+	rtv->rtv_r_a_tov = htonl(lport->r_a_tov);
+	rtv->rtv_e_d_tov = htonl(lport->e_d_tov);
+	rtv->rtv_toq = 0;
+	fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+drop:
+	fc_frame_free(in_fp);
+}
+
+/**
+ * fc_rport_logo_resp() - Handler for logout (LOGO) responses
+ * @sp:	       The sequence the LOGO was on
+ * @fp:	       The LOGO response frame
+ * @rdata_arg: The remote port
+ */
+static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+			       void *rdata_arg)
+{
+	struct fc_rport_priv *rdata = rdata_arg;
+	struct fc_lport *lport = rdata->local_port;
+
+	FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
+			"Received a LOGO %s\n", fc_els_resp_type(fp));
+	if (!IS_ERR(fp))
+		fc_frame_free(fp);
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_enter_logo() - Send a logout (LOGO) request
+ * @rdata: The remote port to send the LOGO request to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
+		     fc_rport_state(rdata));
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
+	if (!fp)
+		return;
+	kref_get(&rdata->kref);
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
+				  fc_rport_logo_resp, rdata, 0))
+		kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_adisc_resp() - Handler for Address Discovery (ADISC) responses
+ * @sp:	       The sequence the ADISC response was on
+ * @fp:	       The ADISC response frame
+ * @rdata_arg: The remote port that sent the ADISC response
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rdata_arg)
+{
+	struct fc_rport_priv *rdata = rdata_arg;
+	struct fc_els_adisc *adisc;
+	u8 op;
+
+	FC_RPORT_DBG(rdata, "Received a ADISC response\n");
+
+	if (fp == ERR_PTR(-FC_EX_CLOSED))
+		goto put;
+
+	mutex_lock(&rdata->rp_mutex);
+
+	if (rdata->rp_state != RPORT_ST_ADISC) {
+		FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
+			     fc_rport_state(rdata));
+		if (IS_ERR(fp))
+			goto err;
+		goto out;
+	}
+
+	if (IS_ERR(fp)) {
+		fc_rport_error(rdata, PTR_ERR(fp));
+		goto err;
+	}
+
+	/*
+	 * If address verification failed.  Consider us logged out of the rport.
+	 * Since the rport is still in discovery, we want to be
+	 * logged in, so go to PLOGI state.  Otherwise, go back to READY.
+	 */
+	op = fc_frame_payload_op(fp);
+	adisc = fc_frame_payload_get(fp, sizeof(*adisc));
+	if (op != ELS_LS_ACC || !adisc ||
+	    ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
+	    get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
+	    get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
+		FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
+		fc_rport_enter_flogi(rdata);
+	} else {
+		FC_RPORT_DBG(rdata, "ADISC OK\n");
+		fc_rport_enter_ready(rdata);
+	}
+out:
+	fc_frame_free(fp);
+err:
+	mutex_unlock(&rdata->rp_mutex);
+put:
+	kref_put(&rdata->kref, fc_rport_destroy);
+}
+
+/**
+ * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
+ * @rdata: The remote port to send the ADISC request to
+ *
+ * Reference counting: increments kref when sending ELS
+ */
+static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
+		     fc_rport_state(rdata));
+
+	fc_rport_state_enter(rdata, RPORT_ST_ADISC);
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
+	if (!fp) {
+		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
+		return;
+	}
+	kref_get(&rdata->kref);
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
+				  fc_rport_adisc_resp, rdata,
+				  2 * lport->r_a_tov)) {
+		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	}
+}
+
+/**
+ * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
+ * @rdata: The remote port that sent the ADISC request
+ * @in_fp: The ADISC request frame
+ */
+static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
+				    struct fc_frame *in_fp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+	struct fc_els_adisc *adisc;
+	struct fc_seq_els_data rjt_data;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+	lockdep_assert_held(&lport->lp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received ADISC request\n");
+
+	adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
+	if (!adisc) {
+		rjt_data.reason = ELS_RJT_PROT;
+		rjt_data.explan = ELS_EXPL_INV_LEN;
+		fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
+		goto drop;
+	}
+
+	fp = fc_frame_alloc(lport, sizeof(*adisc));
+	if (!fp)
+		goto drop;
+	fc_adisc_fill(lport, fp);
+	adisc = fc_frame_payload_get(fp, sizeof(*adisc));
+	adisc->adisc_cmd = ELS_LS_ACC;
+	fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+drop:
+	fc_frame_free(in_fp);
+}
+
+/**
+ * fc_rport_recv_rls_req() - Handle received Read Link Status request
+ * @rdata: The remote port that sent the RLS request
+ * @rx_fp: The PRLI request frame
+ */
+static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
+				  struct fc_frame *rx_fp)
+
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+	struct fc_els_rls *rls;
+	struct fc_els_rls_resp *rsp;
+	struct fc_els_lesb *lesb;
+	struct fc_seq_els_data rjt_data;
+	struct fc_host_statistics *hst;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
+		     fc_rport_state(rdata));
+
+	rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
+	if (!rls) {
+		rjt_data.reason = ELS_RJT_PROT;
+		rjt_data.explan = ELS_EXPL_INV_LEN;
+		goto out_rjt;
+	}
+
+	fp = fc_frame_alloc(lport, sizeof(*rsp));
+	if (!fp) {
+		rjt_data.reason = ELS_RJT_UNAB;
+		rjt_data.explan = ELS_EXPL_INSUF_RES;
+		goto out_rjt;
+	}
+
+	rsp = fc_frame_payload_get(fp, sizeof(*rsp));
+	memset(rsp, 0, sizeof(*rsp));
+	rsp->rls_cmd = ELS_LS_ACC;
+	lesb = &rsp->rls_lesb;
+	if (lport->tt.get_lesb) {
+		/* get LESB from LLD if it supports it */
+		lport->tt.get_lesb(lport, lesb);
+	} else {
+		fc_get_host_stats(lport->host);
+		hst = &lport->host_stats;
+		lesb->lesb_link_fail = htonl(hst->link_failure_count);
+		lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
+		lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
+		lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
+		lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
+		lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
+	}
+
+	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+	goto out;
+
+out_rjt:
+	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
+out:
+	fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_els_req() - Handler for validated ELS requests
+ * @lport: The local port that received the ELS request
+ * @fp:	   The ELS request frame
+ *
+ * Handle incoming ELS requests that require port login.
+ * The ELS opcode has already been validated by the caller.
+ *
+ * Reference counting: does not modify kref
+ */
+static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
+{
+	struct fc_rport_priv *rdata;
+	struct fc_seq_els_data els_data;
+
+	lockdep_assert_held(&lport->lp_mutex);
+
+	rdata = fc_rport_lookup(lport, fc_frame_sid(fp));
+	if (!rdata) {
+		FC_RPORT_ID_DBG(lport, fc_frame_sid(fp),
+				"Received ELS 0x%02x from non-logged-in port\n",
+				fc_frame_payload_op(fp));
+		goto reject;
+	}
+
+	mutex_lock(&rdata->rp_mutex);
+
+	switch (rdata->rp_state) {
+	case RPORT_ST_PRLI:
+	case RPORT_ST_RTV:
+	case RPORT_ST_READY:
+	case RPORT_ST_ADISC:
+		break;
+	case RPORT_ST_PLOGI:
+		if (fc_frame_payload_op(fp) == ELS_PRLI) {
+			FC_RPORT_DBG(rdata, "Reject ELS PRLI "
+				     "while in state %s\n",
+				     fc_rport_state(rdata));
+			mutex_unlock(&rdata->rp_mutex);
+			kref_put(&rdata->kref, fc_rport_destroy);
+			goto busy;
+		}
+		fallthrough;
+	default:
+		FC_RPORT_DBG(rdata,
+			     "Reject ELS 0x%02x while in state %s\n",
+			     fc_frame_payload_op(fp), fc_rport_state(rdata));
+		mutex_unlock(&rdata->rp_mutex);
+		kref_put(&rdata->kref, fc_rport_destroy);
+		goto reject;
+	}
+
+	switch (fc_frame_payload_op(fp)) {
+	case ELS_PRLI:
+		fc_rport_recv_prli_req(rdata, fp);
+		break;
+	case ELS_PRLO:
+		fc_rport_recv_prlo_req(rdata, fp);
+		break;
+	case ELS_ADISC:
+		fc_rport_recv_adisc_req(rdata, fp);
+		break;
+	case ELS_RRQ:
+		fc_seq_els_rsp_send(fp, ELS_RRQ, NULL);
+		fc_frame_free(fp);
+		break;
+	case ELS_REC:
+		fc_seq_els_rsp_send(fp, ELS_REC, NULL);
+		fc_frame_free(fp);
+		break;
+	case ELS_RLS:
+		fc_rport_recv_rls_req(rdata, fp);
+		break;
+	case ELS_RTV:
+		fc_rport_recv_rtv_req(rdata, fp);
+		break;
+	default:
+		fc_frame_free(fp);	/* can't happen */
+		break;
+	}
+
+	mutex_unlock(&rdata->rp_mutex);
+	kref_put(&rdata->kref, fc_rport_destroy);
+	return;
+
+reject:
+	els_data.reason = ELS_RJT_UNAB;
+	els_data.explan = ELS_EXPL_PLOGI_REQD;
+	fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
+	fc_frame_free(fp);
+	return;
+
+busy:
+	els_data.reason = ELS_RJT_BUSY;
+	els_data.explan = ELS_EXPL_NONE;
+	fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
+	fc_frame_free(fp);
+	return;
+}
+
+/**
+ * fc_rport_recv_req() - Handler for requests
+ * @lport: The local port that received the request
+ * @fp:	   The request frame
+ *
+ * Reference counting: does not modify kref
+ */
+void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
+{
+	struct fc_seq_els_data els_data;
+
+	lockdep_assert_held(&lport->lp_mutex);
+
+	/*
+	 * Handle FLOGI, PLOGI and LOGO requests separately, since they
+	 * don't require prior login.
+	 * Check for unsupported opcodes first and reject them.
+	 * For some ops, it would be incorrect to reject with "PLOGI required".
+	 */
+	switch (fc_frame_payload_op(fp)) {
+	case ELS_FLOGI:
+		fc_rport_recv_flogi_req(lport, fp);
+		break;
+	case ELS_PLOGI:
+		fc_rport_recv_plogi_req(lport, fp);
+		break;
+	case ELS_LOGO:
+		fc_rport_recv_logo_req(lport, fp);
+		break;
+	case ELS_PRLI:
+	case ELS_PRLO:
+	case ELS_ADISC:
+	case ELS_RRQ:
+	case ELS_REC:
+	case ELS_RLS:
+	case ELS_RTV:
+		fc_rport_recv_els_req(lport, fp);
+		break;
+	default:
+		els_data.reason = ELS_RJT_UNSUP;
+		els_data.explan = ELS_EXPL_NONE;
+		fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
+		fc_frame_free(fp);
+		break;
+	}
+}
+EXPORT_SYMBOL(fc_rport_recv_req);
+
+/**
+ * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
+ * @lport: The local port that received the PLOGI request
+ * @rx_fp: The PLOGI request frame
+ *
+ * Reference counting: increments kref on return
+ */
+static void fc_rport_recv_plogi_req(struct fc_lport *lport,
+				    struct fc_frame *rx_fp)
+{
+	struct fc_disc *disc;
+	struct fc_rport_priv *rdata;
+	struct fc_frame *fp = rx_fp;
+	struct fc_els_flogi *pl;
+	struct fc_seq_els_data rjt_data;
+	u32 sid;
+
+	lockdep_assert_held(&lport->lp_mutex);
+
+	sid = fc_frame_sid(fp);
+
+	FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
+
+	pl = fc_frame_payload_get(fp, sizeof(*pl));
+	if (!pl) {
+		FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
+		rjt_data.reason = ELS_RJT_PROT;
+		rjt_data.explan = ELS_EXPL_INV_LEN;
+		goto reject;
+	}
+
+	disc = &lport->disc;
+	mutex_lock(&disc->disc_mutex);
+	rdata = fc_rport_create(lport, sid);
+	if (!rdata) {
+		mutex_unlock(&disc->disc_mutex);
+		rjt_data.reason = ELS_RJT_UNAB;
+		rjt_data.explan = ELS_EXPL_INSUF_RES;
+		goto reject;
+	}
+
+	mutex_lock(&rdata->rp_mutex);
+	mutex_unlock(&disc->disc_mutex);
+
+	rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
+	rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
+
+	/*
+	 * If the rport was just created, possibly due to the incoming PLOGI,
+	 * set the state appropriately and accept the PLOGI.
+	 *
+	 * If we had also sent a PLOGI, and if the received PLOGI is from a
+	 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
+	 * "command already in progress".
+	 *
+	 * XXX TBD: If the session was ready before, the PLOGI should result in
+	 * all outstanding exchanges being reset.
+	 */
+	switch (rdata->rp_state) {
+	case RPORT_ST_INIT:
+		FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
+		break;
+	case RPORT_ST_PLOGI_WAIT:
+		FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
+		break;
+	case RPORT_ST_PLOGI:
+		FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
+		if (rdata->ids.port_name < lport->wwpn) {
+			mutex_unlock(&rdata->rp_mutex);
+			rjt_data.reason = ELS_RJT_INPROG;
+			rjt_data.explan = ELS_EXPL_NONE;
+			goto reject;
+		}
+		break;
+	case RPORT_ST_PRLI:
+	case RPORT_ST_RTV:
+	case RPORT_ST_READY:
+	case RPORT_ST_ADISC:
+		FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
+			     "- ignored for now\n", rdata->rp_state);
+		/* XXX TBD - should reset */
+		break;
+	case RPORT_ST_FLOGI:
+	case RPORT_ST_DELETE:
+		FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
+			     fc_rport_state(rdata));
+		mutex_unlock(&rdata->rp_mutex);
+		rjt_data.reason = ELS_RJT_BUSY;
+		rjt_data.explan = ELS_EXPL_NONE;
+		goto reject;
+	}
+	if (!fc_rport_compatible_roles(lport, rdata)) {
+		FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n");
+		mutex_unlock(&rdata->rp_mutex);
+		rjt_data.reason = ELS_RJT_LOGIC;
+		rjt_data.explan = ELS_EXPL_NONE;
+		goto reject;
+	}
+
+	/*
+	 * Get session payload size from incoming PLOGI.
+	 */
+	rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
+
+	/*
+	 * Send LS_ACC.	 If this fails, the originator should retry.
+	 */
+	fp = fc_frame_alloc(lport, sizeof(*pl));
+	if (!fp)
+		goto out;
+
+	fc_plogi_fill(lport, fp, ELS_LS_ACC);
+	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+	fc_rport_enter_prli(rdata);
+out:
+	mutex_unlock(&rdata->rp_mutex);
+	fc_frame_free(rx_fp);
+	return;
+
+reject:
+	fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
+	fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
+ * @rdata: The remote port that sent the PRLI request
+ * @rx_fp: The PRLI request frame
+ */
+static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
+				   struct fc_frame *rx_fp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+	struct {
+		struct fc_els_prli prli;
+		struct fc_els_spp spp;
+	} *pp;
+	struct fc_els_spp *rspp;	/* request service param page */
+	struct fc_els_spp *spp;	/* response spp */
+	unsigned int len;
+	unsigned int plen;
+	enum fc_els_spp_resp resp;
+	struct fc_seq_els_data rjt_data;
+	struct fc4_prov *prov;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
+		     fc_rport_state(rdata));
+
+	len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
+	pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
+	if (!pp)
+		goto reject_len;
+	plen = ntohs(pp->prli.prli_len);
+	if ((plen % 4) != 0 || plen > len || plen < 16)
+		goto reject_len;
+	if (plen < len)
+		len = plen;
+	plen = pp->prli.prli_spp_len;
+	if ((plen % 4) != 0 || plen < sizeof(*spp) ||
+	    plen > len || len < sizeof(*pp) || plen < 12)
+		goto reject_len;
+	rspp = &pp->spp;
+
+	fp = fc_frame_alloc(lport, len);
+	if (!fp) {
+		rjt_data.reason = ELS_RJT_UNAB;
+		rjt_data.explan = ELS_EXPL_INSUF_RES;
+		goto reject;
+	}
+	pp = fc_frame_payload_get(fp, len);
+	WARN_ON(!pp);
+	memset(pp, 0, len);
+	pp->prli.prli_cmd = ELS_LS_ACC;
+	pp->prli.prli_spp_len = plen;
+	pp->prli.prli_len = htons(len);
+	len -= sizeof(struct fc_els_prli);
+
+	/*
+	 * Go through all the service parameter pages and build
+	 * response.  If plen indicates longer SPP than standard,
+	 * use that.  The entire response has been pre-cleared above.
+	 */
+	spp = &pp->spp;
+	mutex_lock(&fc_prov_mutex);
+	while (len >= plen) {
+		rdata->spp_type = rspp->spp_type;
+		spp->spp_type = rspp->spp_type;
+		spp->spp_type_ext = rspp->spp_type_ext;
+		resp = 0;
+
+		if (rspp->spp_type < FC_FC4_PROV_SIZE) {
+			enum fc_els_spp_resp active = 0, passive = 0;
+
+			prov = fc_active_prov[rspp->spp_type];
+			if (prov)
+				active = prov->prli(rdata, plen, rspp, spp);
+			prov = fc_passive_prov[rspp->spp_type];
+			if (prov)
+				passive = prov->prli(rdata, plen, rspp, spp);
+			if (!active || passive == FC_SPP_RESP_ACK)
+				resp = passive;
+			else
+				resp = active;
+			FC_RPORT_DBG(rdata, "PRLI rspp type %x "
+				     "active %x passive %x\n",
+				     rspp->spp_type, active, passive);
+		}
+		if (!resp) {
+			if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
+				resp |= FC_SPP_RESP_CONF;
+			else
+				resp |= FC_SPP_RESP_INVL;
+		}
+		spp->spp_flags |= resp;
+		len -= plen;
+		rspp = (struct fc_els_spp *)((char *)rspp + plen);
+		spp = (struct fc_els_spp *)((char *)spp + plen);
+	}
+	mutex_unlock(&fc_prov_mutex);
+
+	/*
+	 * Send LS_ACC.	 If this fails, the originator should retry.
+	 */
+	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+
+	goto drop;
+
+reject_len:
+	rjt_data.reason = ELS_RJT_PROT;
+	rjt_data.explan = ELS_EXPL_INV_LEN;
+reject:
+	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
+drop:
+	fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
+ * @rdata: The remote port that sent the PRLO request
+ * @rx_fp: The PRLO request frame
+ */
+static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
+				   struct fc_frame *rx_fp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	struct fc_frame *fp;
+	struct {
+		struct fc_els_prlo prlo;
+		struct fc_els_spp spp;
+	} *pp;
+	struct fc_els_spp *rspp;	/* request service param page */
+	struct fc_els_spp *spp;		/* response spp */
+	unsigned int len;
+	unsigned int plen;
+	struct fc_seq_els_data rjt_data;
+
+	lockdep_assert_held(&rdata->rp_mutex);
+
+	FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
+		     fc_rport_state(rdata));
+
+	len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
+	pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
+	if (!pp)
+		goto reject_len;
+	plen = ntohs(pp->prlo.prlo_len);
+	if (plen != 20)
+		goto reject_len;
+	if (plen < len)
+		len = plen;
+
+	rspp = &pp->spp;
+
+	fp = fc_frame_alloc(lport, len);
+	if (!fp) {
+		rjt_data.reason = ELS_RJT_UNAB;
+		rjt_data.explan = ELS_EXPL_INSUF_RES;
+		goto reject;
+	}
+
+	pp = fc_frame_payload_get(fp, len);
+	WARN_ON(!pp);
+	memset(pp, 0, len);
+	pp->prlo.prlo_cmd = ELS_LS_ACC;
+	pp->prlo.prlo_obs = 0x10;
+	pp->prlo.prlo_len = htons(len);
+	spp = &pp->spp;
+	spp->spp_type = rspp->spp_type;
+	spp->spp_type_ext = rspp->spp_type_ext;
+	spp->spp_flags = FC_SPP_RESP_ACK;
+
+	fc_rport_enter_prli(rdata);
+
+	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
+	lport->tt.frame_send(lport, fp);
+	goto drop;
+
+reject_len:
+	rjt_data.reason = ELS_RJT_PROT;
+	rjt_data.explan = ELS_EXPL_INV_LEN;
+reject:
+	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
+drop:
+	fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
+ * @lport: The local port that received the LOGO request
+ * @fp:	   The LOGO request frame
+ *
+ * Reference counting: drops kref on return
+ */
+static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
+{
+	struct fc_rport_priv *rdata;
+	u32 sid;
+
+	lockdep_assert_held(&lport->lp_mutex);
+
+	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
+
+	sid = fc_frame_sid(fp);
+
+	rdata = fc_rport_lookup(lport, sid);
+	if (rdata) {
+		mutex_lock(&rdata->rp_mutex);
+		FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
+			     fc_rport_state(rdata));
+
+		fc_rport_enter_delete(rdata, RPORT_EV_STOP);
+		mutex_unlock(&rdata->rp_mutex);
+		kref_put(&rdata->kref, fc_rport_destroy);
+	} else
+		FC_RPORT_ID_DBG(lport, sid,
+				"Received LOGO from non-logged-in port\n");
+	fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_flush_queue() - Flush the rport_event_queue
+ */
+void fc_rport_flush_queue(void)
+{
+	flush_workqueue(rport_event_queue);
+}
+EXPORT_SYMBOL(fc_rport_flush_queue);
+
+/**
+ * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
+ * @rdata: remote port private
+ * @spp_len: service parameter page length
+ * @rspp: received service parameter page
+ * @spp: response service parameter page
+ *
+ * Returns the value for the response code to be placed in spp_flags;
+ * Returns 0 if not an initiator.
+ */
+static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
+			     const struct fc_els_spp *rspp,
+			     struct fc_els_spp *spp)
+{
+	struct fc_lport *lport = rdata->local_port;
+	u32 fcp_parm;
+
+	fcp_parm = ntohl(rspp->spp_params);
+	rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+	if (fcp_parm & FCP_SPPF_INIT_FCN)
+		rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+	if (fcp_parm & FCP_SPPF_TARG_FCN)
+		rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
+	if (fcp_parm & FCP_SPPF_RETRY)
+		rdata->flags |= FC_RP_FLAGS_RETRY;
+	rdata->supported_classes = FC_COS_CLASS3;
+
+	if (!(lport->service_params & FCP_SPPF_INIT_FCN))
+		return 0;
+
+	spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
+
+	/*
+	 * OR in our service parameters with other providers (target), if any.
+	 */
+	fcp_parm = ntohl(spp->spp_params);
+	spp->spp_params = htonl(fcp_parm | lport->service_params);
+	return FC_SPP_RESP_ACK;
+}
+
+/*
+ * FC-4 provider ops for FCP initiator.
+ */
+struct fc4_prov fc_rport_fcp_init = {
+	.prli = fc_rport_fcp_prli,
+};
+
+/**
+ * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
+ * @rdata: remote port private
+ * @spp_len: service parameter page length
+ * @rspp: received service parameter page
+ * @spp: response service parameter page
+ */
+static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
+			    const struct fc_els_spp *rspp,
+			    struct fc_els_spp *spp)
+{
+	if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
+		return FC_SPP_RESP_INVL;
+	return FC_SPP_RESP_ACK;
+}
+
+/*
+ * FC-4 provider ops for type 0 service parameters.
+ *
+ * This handles the special case of type 0 which is always successful
+ * but doesn't do anything otherwise.
+ */
+struct fc4_prov fc_rport_t0_prov = {
+	.prli = fc_rport_t0_prli,
+};
+
+/**
+ * fc_setup_rport() - Initialize the rport_event_queue
+ */
+int fc_setup_rport(void)
+{
+	rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
+	if (!rport_event_queue)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * fc_destroy_rport() - Destroy the rport_event_queue
+ */
+void fc_destroy_rport(void)
+{
+	destroy_workqueue(rport_event_queue);
+}
+
+/**
+ * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
+ * @rport: The remote port whose I/O should be terminated
+ */
+void fc_rport_terminate_io(struct fc_rport *rport)
+{
+	struct fc_rport_libfc_priv *rpriv = rport->dd_data;
+	struct fc_lport *lport = rpriv->local_port;
+
+	lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
+	lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
+}
+EXPORT_SYMBOL(fc_rport_terminate_io);