litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/arch/s390/kvm/sigp.c

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Diffstat (limited to 'arch/s390/kvm/sigp.c')

-rw-r--r--

arch/s390/kvm/sigp.c

1 files changed, 3 insertions, 2 deletions

 #define SIGP_STAT_RECEIVER_CHECK    0x00000001UL
-static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, u64 *reg)
+static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
+                        unsigned long *reg)
 {
         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
         int rc;
 }
 static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
-                             u64 *reg)
+                             unsigned long *reg)
 {
         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
         struct kvm_s390_local_interrupt *li;

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/*
 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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.
 */

#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 <asm/unaligned.h>

#include <scsi/libfc.h>
#include <scsi/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 *, struct fc_frame *);
static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *);
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 caller must hold either disc_mutex or rcu_read_lock().
 */
static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
					     u32 port_id)
{
	struct fc_rport_priv *rdata;

	list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
		if (rdata->ids.port_id == port_id)
			return rdata;
	return NULL;
}

/**
 * fc_rport_create() - Create a new remote port
 * @lport: The local port this remote port will be associated with
 * @ids:   The identifiers for the new remote port
 *
 * The remote port will start in the INIT state.
 *
 * Locking note:  must be called with the disc_mutex held.
 */
static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
					     u32 port_id)
{
	struct fc_rport_priv *rdata;

	rdata = lport->tt.rport_lookup(lport, port_id);
	if (rdata)
		return rdata;

	rdata = kzalloc(sizeof(*rdata) + lport->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;
}

/**
 * fc_rport_destroy() - Free a remote port after last reference is released
 * @kref: The remote port's kref
 */
static 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);
}

/**
 * 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
 *
 * Locking Note: Called with the rport lock held
 */
static void fc_rport_state_enter(struct fc_rport_priv *rdata,
				 enum fc_rport_state new)
{
	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
 */
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)
			rport = fc_remote_port_add(lport->host, 0, &ids);
		if (!rport) {
			FC_RPORT_DBG(rdata, "Failed to add the rport\n");
			lport->tt.rport_logoff(rdata);
			kref_put(&rdata->kref, lport->tt.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, lport->tt.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);
		}
		cancel_delayed_work_sync(&rdata->retry_work);

		/*
		 * 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(&lport->disc.disc_mutex);
		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, lport->tt.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 {
				FC_RPORT_DBG(rdata, "work delete\n");
				list_del_rcu(&rdata->peers);
				mutex_unlock(&rdata->rp_mutex);
				kref_put(&rdata->kref, lport->tt.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_enter_ready(rdata);
			mutex_unlock(&rdata->rp_mutex);
		}
		mutex_unlock(&lport->disc.disc_mutex);
		break;

	default:
		mutex_unlock(&rdata->rp_mutex);
		break;
	}
}

/**
 * fc_rport_login() - Start the remote port login state machine
 * @rdata: The remote port to be logged in to
 *
 * 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.
 */
static int fc_rport_login(struct fc_rport_priv *rdata)
{
	mutex_lock(&rdata->rp_mutex);

	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;
	default:
		FC_RPORT_DBG(rdata, "Login to port\n");
		fc_rport_enter_flogi(rdata);
		break;
	}
	mutex_unlock(&rdata->rp_mutex);

	return 0;
}

/**
 * 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
 *
 * Locking Note: Called with the rport lock held.
 *
 * 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.
 */
static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
				  enum fc_rport_event event)
{
	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)
		queue_work(rport_event_queue, &rdata->event_work);
	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.
 */
static int fc_rport_logoff(struct fc_rport_priv *rdata)
{
	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_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;
}

/**
 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
 * @rdata: The remote port that is ready
 *
 * Locking Note: The rport lock is expected to be held before calling
 * this routine.
 */
static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
{
	fc_rport_state_enter(rdata, RPORT_ST_READY);

	FC_RPORT_DBG(rdata, "Port is Ready\n");

	if (rdata->event == RPORT_EV_NONE)
		queue_work(rport_event_queue, &rdata->event_work);
	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.
 */
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);

	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);
}

/**
 * fc_rport_error() - Error handler, called once retries have been exhausted
 * @rdata: The remote port the error is happened on
 * @fp:	   The error code encapsulated in a frame pointer
 *
 * Locking Note: The rport lock is expected to be held before
 * calling this routine
 */
static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
{
	FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
		     IS_ERR(fp) ? -PTR_ERR(fp) : 0,
		     fc_rport_state(rdata), rdata->retries);

	switch (rdata->rp_state) {
	case RPORT_ST_FLOGI:
	case RPORT_ST_PLOGI:
		rdata->flags &= ~FC_RP_STARTED;
		fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
		break;
	case RPORT_ST_RTV:
		fc_rport_enter_ready(rdata);
		break;
	case RPORT_ST_PRLI:
	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
 * @fp:	   The error code encapsulated in a frame pointer
 *
 * If the error was an exchange timeout retry immediately,
 * otherwise wait for E_D_TOV.
 *
 * Locking Note: The rport lock is expected to be held before
 * calling this routine
 */
static void fc_rport_error_retry(struct fc_rport_priv *rdata,
				 struct fc_frame *fp)
{
	unsigned long delay = msecs_to_jiffies(FC_DEF_E_D_TOV);

	/* make sure this isn't an FC_EX_CLOSED error, never retry those */
	if (PTR_ERR(fp) == -FC_EX_CLOSED)
		goto out;

	if (rdata->retries < rdata->local_port->max_rport_retry_count) {
		FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
			     PTR_ERR(fp), fc_rport_state(rdata));
		rdata->retries++;
		/* no additional delay on exchange timeouts */
		if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
			delay = 0;
		schedule_delayed_work(&rdata->retry_work, delay);
		return;
	}

out:
	fc_rport_error(rdata, fp);
}

/**
 * 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;

	FC_RPORT_DBG(rdata, "Received a FLOGI %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_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, fp);
		goto err;
	}

	if (fc_frame_payload_op(fp) != ELS_LS_ACC)
		goto bad;
	if (fc_rport_login_complete(rdata, fp))
		goto bad;

	flogi = fc_frame_payload_get(fp, sizeof(*flogi));
	if (!flogi)
		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, rdata->local_port->tt.rport_destroy);
	return;
bad:
	FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
	fc_rport_error_retry(rdata, fp);
	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
 *
 * Locking Note: The rport lock is expected to be held before calling
 * this routine.
 */
static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
{
	struct fc_lport *lport = rdata->local_port;
	struct fc_frame *fp;

	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, fp);

	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, NULL);
	else
		kref_get(&rdata->kref);
}

/**
 * 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
 */
static void fc_rport_recv_flogi_req(struct fc_lport *lport,
				    struct fc_frame *rx_fp)
{
	struct fc_disc *disc;
	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");

	disc = &lport->disc;
	mutex_lock(&disc->disc_mutex);

	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 = lport->tt.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.
		 */
		if (lport->point_to_multipoint)
			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;
	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;
	}
	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;
	}

	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);

	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);
	mutex_unlock(&disc->disc_mutex);
	fc_frame_free(rx_fp);
	return;

reject:
	mutex_unlock(&disc->disc_mutex);
	lport->tt.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;

	mutex_lock(&rdata->rp_mutex);

	FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));

	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, 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
		fc_rport_error_retry(rdata, fp);

out:
	fc_frame_free(fp);
err:
	mutex_unlock(&rdata->rp_mutex);
	kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
}

/**
 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
 * @rdata: The remote port to send a PLOGI to
 *
 * Locking Note: The rport lock is expected to be held before calling
 * this routine.
 */
static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
{
	struct fc_lport *lport = rdata->local_port;
	struct fc_frame *fp;

	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, fp);
		return;
	}
	rdata->e_d_tov = lport->e_d_tov;

	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, NULL);
	else
		kref_get(&rdata->kref);
}

/**
 * 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 fc4_prov *prov;
	u32 roles = FC_RPORT_ROLE_UNKNOWN;
	u32 fcp_parm = 0;
	u8 op;
	u8 resp_code = 0;

	mutex_lock(&rdata->rp_mutex);

	FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));

	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, 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)
			goto out;

		resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
		FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n",
			     pp->spp.spp_flags);
		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, fp);
			else
				fc_rport_error_retry(rdata, fp);
			goto out;
		}
		if (pp->prli.prli_spp_len < sizeof(pp->spp))
			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;

		prov = fc_passive_prov[FC_TYPE_FCP];
		if (prov) {
			memset(&temp_spp, 0, sizeof(temp_spp));
			prov->prli(rdata, pp->prli.prli_spp_len,
				   &pp->spp, &temp_spp);
		}

		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 {
		FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
		fc_rport_error_retry(rdata, fp);
	}

out:
	fc_frame_free(fp);
err:
	mutex_unlock(&rdata->rp_mutex);
	kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
}

/**
 * fc_rport_enter_prli() - Send Process Login (PRLI) request
 * @rdata: The remote port to send the PRLI request to
 *
 * Locking Note: The rport lock is expected to be held before calling
 * this routine.
 */
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;

	/*
	 * 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;
	}

	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, fp);
		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);

	if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp,
				    NULL, rdata, 2 * lport->r_a_tov))
		fc_rport_error_retry(rdata, NULL);
	else
		kref_get(&rdata->kref);
}

/**
 * fc_rport_els_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;

	mutex_lock(&rdata->rp_mutex);


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