cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/libfc/fc_rport.c

Directory: drivers/scsi/libfc
/*
 * 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.
 */

/*
 * 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 <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 *, 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;
}

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EXPORT_SYMBOL(fc_rport_lookup);

/**
 * 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.
 */



struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
{
	struct fc_rport_priv *rdata;

	rdata = fc_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;
}

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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);
}

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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;
}


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/**
 * 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;
}

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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;
}


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/**
 * 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;
}


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/**
 * 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 {
				FC_RPORT_DBG(rdata, "work delete\n");
				mutex_lock(&lport->disc.disc_mutex);
				list_del_rcu(&rdata->peers);
				mutex_unlock(&lport->disc.disc_mutex);
				mutex_unlock(&rdata->rp_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);
}


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/**
 * 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;
}

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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
 *
 * 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.
 *
 * Reference counting: does not modify kref
 */



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);

	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 = event;
}


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/**
 * 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;
}

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EXPORT_SYMBOL(fc_rport_logoff);

/**
 * 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.
 *
 * Reference counting: schedules workqueue, does not modify kref
 */



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");

	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;
}


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/**
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Robert Love8362.88%111.11%


Joe Eykholt2720.45%555.56%


Hannes Reinecke2216.67%333.33%


Total132100.00%9100.00%



/**
 * fc_rport_error() - Error handler, called once retries have been exhausted
 * @rdata: The remote port the error is happened on
 * @err:   The error code
 *
 * Locking Note: The rport lock is expected to be held before
 * calling this routine
 *
 * 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;

	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:
	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;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Joe Eykholt4735.07%545.45%


Hannes Reinecke4231.34%218.18%


Robert Love2417.91%218.18%


Christopher Leech1914.18%19.09%


Abhijeet Joglekar21.49%19.09%


Total134100.00%11100.00%



/**
 * 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.
 *
 * Locking Note: The rport lock is expected to be held before
 * calling this routine
 *
 * 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);

	/* 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Joe Eykholt8267.21%114.29%


Hannes Reinecke3125.41%457.14%


Hillf Danton64.92%114.29%


Krishna Mohan32.46%114.29%


Total122100.00%7100.00%



/**
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Joe Eykholt155100.00%1100.00%


Total155100.00%1100.00%



/**
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Joe Eykholt26167.62%116.67%


Hannes Reinecke11930.83%350.00%


Hillf Danton51.30%116.67%


Bart Van Assche10.26%116.67%


Total386100.00%6100.00%



/**
 * 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.
 *
 * 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;