[deliverable/linux.git] / drivers / target / tcm_fc / tfc_sess.c

/*
 * Copyright (c) 2010 Cisco Systems, Inc.
 *
 * 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.
 */

/* XXX TBD some includes may be extraneous */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <linux/hash.h>
#include <linux/rcupdate.h>
#include <linux/rculist.h>
#include <linux/kref.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/libfc.h>

#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>

#include "tcm_fc.h"

static void ft_sess_delete_all(struct ft_tport *);

/*
 * Lookup or allocate target local port.
 * Caller holds ft_lport_lock.
 */
static struct ft_tport *ft_tport_create(struct fc_lport *lport)
{
	struct ft_tpg *tpg;
	struct ft_tport *tport;
	int i;

	tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
					  lockdep_is_held(&ft_lport_lock));
	if (tport && tport->tpg)
		return tport;

	tpg = ft_lport_find_tpg(lport);
	if (!tpg)
		return NULL;

	if (tport) {
		tport->tpg = tpg;
		return tport;
	}

	tport = kzalloc(sizeof(*tport), GFP_KERNEL);
	if (!tport)
		return NULL;

	tport->lport = lport;
	tport->tpg = tpg;
	tpg->tport = tport;
	for (i = 0; i < FT_SESS_HASH_SIZE; i++)
		INIT_HLIST_HEAD(&tport->hash[i]);

	rcu_assign_pointer(lport->prov[FC_TYPE_FCP], tport);
	return tport;
}

/*
 * Delete a target local port.
 * Caller holds ft_lport_lock.
 */
static void ft_tport_delete(struct ft_tport *tport)
{
	struct fc_lport *lport;
	struct ft_tpg *tpg;

	ft_sess_delete_all(tport);
	lport = tport->lport;
	BUG_ON(tport != lport->prov[FC_TYPE_FCP]);
	rcu_assign_pointer(lport->prov[FC_TYPE_FCP], NULL);

	tpg = tport->tpg;
	if (tpg) {
		tpg->tport = NULL;
		tport->tpg = NULL;
	}
	kfree_rcu(tport, rcu);
}

/*
 * Add local port.
 * Called thru fc_lport_iterate().
 */
void ft_lport_add(struct fc_lport *lport, void *arg)
{
	mutex_lock(&ft_lport_lock);
	ft_tport_create(lport);
	mutex_unlock(&ft_lport_lock);
}

/*
 * Delete local port.
 * Called thru fc_lport_iterate().
 */
void ft_lport_del(struct fc_lport *lport, void *arg)
{
	struct ft_tport *tport;

	mutex_lock(&ft_lport_lock);
	tport = lport->prov[FC_TYPE_FCP];
	if (tport)
		ft_tport_delete(tport);
	mutex_unlock(&ft_lport_lock);
}

/*
 * Notification of local port change from libfc.
 * Create or delete local port and associated tport.
 */
int ft_lport_notify(struct notifier_block *nb, unsigned long event, void *arg)
{
	struct fc_lport *lport = arg;

	switch (event) {
	case FC_LPORT_EV_ADD:
		ft_lport_add(lport, NULL);
		break;
	case FC_LPORT_EV_DEL:
		ft_lport_del(lport, NULL);
		break;
	}
	return NOTIFY_DONE;
}

/*
 * Hash function for FC_IDs.
 */
static u32 ft_sess_hash(u32 port_id)
{
	return hash_32(port_id, FT_SESS_HASH_BITS);
}

/*
 * Find session in local port.
 * Sessions and hash lists are RCU-protected.
 * A reference is taken which must be eventually freed.
 */
static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id)
{
	struct ft_tport *tport;
	struct hlist_head *head;
	struct hlist_node *pos;
	struct ft_sess *sess;

	rcu_read_lock();
	tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
	if (!tport)
		goto out;

	head = &tport->hash[ft_sess_hash(port_id)];
	hlist_for_each_entry_rcu(sess, pos, head, hash) {
		if (sess->port_id == port_id) {
			kref_get(&sess->kref);
			rcu_read_unlock();
			pr_debug("port_id %x found %p\n", port_id, sess);
			return sess;
		}
	}
out:
	rcu_read_unlock();
	pr_debug("port_id %x not found\n", port_id);
	return NULL;
}

/*
 * Allocate session and enter it in the hash for the local port.
 * Caller holds ft_lport_lock.
 */
static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id,
				      struct ft_node_acl *acl)
{
	struct ft_sess *sess;
	struct hlist_head *head;
	struct hlist_node *pos;

	head = &tport->hash[ft_sess_hash(port_id)];
	hlist_for_each_entry_rcu(sess, pos, head, hash)
		if (sess->port_id == port_id)
			return sess;

	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
	if (!sess)
		return NULL;

	sess->se_sess = transport_init_session();
	if (IS_ERR(sess->se_sess)) {
		kfree(sess);
		return NULL;
	}
	sess->se_sess->se_node_acl = &acl->se_node_acl;
	sess->tport = tport;
	sess->port_id = port_id;
	kref_init(&sess->kref);	/* ref for table entry */
	hlist_add_head_rcu(&sess->hash, head);
	tport->sess_count++;

	pr_debug("port_id %x sess %p\n", port_id, sess);

	transport_register_session(&tport->tpg->se_tpg, &acl->se_node_acl,
				   sess->se_sess, sess);
	return sess;
}

/*
 * Unhash the session.
 * Caller holds ft_lport_lock.
 */
static void ft_sess_unhash(struct ft_sess *sess)
{
	struct ft_tport *tport = sess->tport;

	hlist_del_rcu(&sess->hash);
	BUG_ON(!tport->sess_count);
	tport->sess_count--;
	sess->port_id = -1;
	sess->params = 0;
}

/*
 * Delete session from hash.
 * Caller holds ft_lport_lock.
 */
static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id)
{
	struct hlist_head *head;
	struct hlist_node *pos;
	struct ft_sess *sess;

	head = &tport->hash[ft_sess_hash(port_id)];
	hlist_for_each_entry_rcu(sess, pos, head, hash) {
		if (sess->port_id == port_id) {
			ft_sess_unhash(sess);
			return sess;
		}
	}
	return NULL;
}

/*
 * Delete all sessions from tport.
 * Caller holds ft_lport_lock.
 */
static void ft_sess_delete_all(struct ft_tport *tport)
{
	struct hlist_head *head;
	struct hlist_node *pos;
	struct ft_sess *sess;

	for (head = tport->hash;
	     head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
		hlist_for_each_entry_rcu(sess, pos, head, hash) {
			ft_sess_unhash(sess);
			transport_deregister_session_configfs(sess->se_sess);
			ft_sess_put(sess);	/* release from table */
		}
	}
}

/*
 * TCM ops for sessions.
 */

/*
 * Determine whether session is allowed to be shutdown in the current context.
 * Returns non-zero if the session should be shutdown.
 */
int ft_sess_shutdown(struct se_session *se_sess)
{
	struct ft_sess *sess = se_sess->fabric_sess_ptr;

	pr_debug("port_id %x\n", sess->port_id);
	return 1;
}

/*
 * Remove session and send PRLO.
 * This is called when the ACL is being deleted or queue depth is changing.
 */
void ft_sess_close(struct se_session *se_sess)
{
	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	u32 port_id;

	mutex_lock(&ft_lport_lock);
	port_id = sess->port_id;
	if (port_id == -1) {
		mutex_unlock(&ft_lport_lock);
		return;
	}
	pr_debug("port_id %x\n", port_id);
	ft_sess_unhash(sess);
	mutex_unlock(&ft_lport_lock);
	transport_deregister_session_configfs(se_sess);
	ft_sess_put(sess);
	/* XXX Send LOGO or PRLO */
	synchronize_rcu();		/* let transport deregister happen */
}

u32 ft_sess_get_index(struct se_session *se_sess)
{
	struct ft_sess *sess = se_sess->fabric_sess_ptr;

	return sess->port_id;	/* XXX TBD probably not what is needed */
}

u32 ft_sess_get_port_name(struct se_session *se_sess,
			  unsigned char *buf, u32 len)
{
	struct ft_sess *sess = se_sess->fabric_sess_ptr;

	return ft_format_wwn(buf, len, sess->port_name);
}

/*
 * libfc ops involving sessions.
 */

static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len,
			  const struct fc_els_spp *rspp, struct fc_els_spp *spp)
{
	struct ft_tport *tport;
	struct ft_sess *sess;
	struct ft_node_acl *acl;
	u32 fcp_parm;

	tport = ft_tport_create(rdata->local_port);
	if (!tport)
		return 0;	/* not a target for this local port */

	acl = ft_acl_get(tport->tpg, rdata);
	if (!acl)
		return 0;

	if (!rspp)
		goto fill;

	if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL))
		return FC_SPP_RESP_NO_PA;

	/*
	 * If both target and initiator bits are off, the SPP is invalid.
	 */
	fcp_parm = ntohl(rspp->spp_params);
	if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN)))
		return FC_SPP_RESP_INVL;

	/*
	 * Create session (image pair) only if requested by
	 * EST_IMG_PAIR flag and if the requestor is an initiator.
	 */
	if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) {
		spp->spp_flags |= FC_SPP_EST_IMG_PAIR;
		if (!(fcp_parm & FCP_SPPF_INIT_FCN))
			return FC_SPP_RESP_CONF;
		sess = ft_sess_create(tport, rdata->ids.port_id, acl);
		if (!sess)
			return FC_SPP_RESP_RES;
		if (!sess->params)
			rdata->prli_count++;
		sess->params = fcp_parm;
		sess->port_name = rdata->ids.port_name;
		sess->max_frame = rdata->maxframe_size;

		/* XXX TBD - clearing actions.  unit attn, see 4.10 */
	}

	/*
	 * OR in our service parameters with other provider (initiator), if any.
	 */
fill:
	fcp_parm = ntohl(spp->spp_params);
	fcp_parm &= ~FCP_SPPF_RETRY;
	spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN);
	return FC_SPP_RESP_ACK;
}

/**
 * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target
 * @rdata: remote port private
 * @spp_len: service parameter page length
 * @rspp: received service parameter page (NULL for outgoing PRLI)
 * @spp: response service parameter page
 *
 * Returns spp response code.
 */
static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len,
		   const struct fc_els_spp *rspp, struct fc_els_spp *spp)
{
	int ret;

	mutex_lock(&ft_lport_lock);
	ret = ft_prli_locked(rdata, spp_len, rspp, spp);
	mutex_unlock(&ft_lport_lock);
	pr_debug("port_id %x flags %x ret %x\n",
	       rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret);
	return ret;
}

static void ft_sess_rcu_free(struct rcu_head *rcu)
{
	struct ft_sess *sess = container_of(rcu, struct ft_sess, rcu);

	kfree(sess);
}

static void ft_sess_free(struct kref *kref)
{
	struct ft_sess *sess = container_of(kref, struct ft_sess, kref);

	transport_deregister_session(sess->se_sess);
	call_rcu(&sess->rcu, ft_sess_rcu_free);
}

void ft_sess_put(struct ft_sess *sess)
{
	int sess_held = atomic_read(&sess->kref.refcount);

	BUG_ON(!sess_held);
	kref_put(&sess->kref, ft_sess_free);
}

static void ft_prlo(struct fc_rport_priv *rdata)
{
	struct ft_sess *sess;
	struct ft_tport *tport;

	mutex_lock(&ft_lport_lock);
	tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP],
					  lockdep_is_held(&ft_lport_lock));

	if (!tport) {
		mutex_unlock(&ft_lport_lock);
		return;
	}
	sess = ft_sess_delete(tport, rdata->ids.port_id);
	if (!sess) {
		mutex_unlock(&ft_lport_lock);
		return;
	}
	mutex_unlock(&ft_lport_lock);
	transport_deregister_session_configfs(sess->se_sess);
	ft_sess_put(sess);		/* release from table */
	rdata->prli_count--;
	/* XXX TBD - clearing actions.  unit attn, see 4.10 */
}

/*
 * Handle incoming FCP request.
 * Caller has verified that the frame is type FCP.
 */
static void ft_recv(struct fc_lport *lport, struct fc_frame *fp)
{
	struct ft_sess *sess;
	u32 sid = fc_frame_sid(fp);

	pr_debug("sid %x\n", sid);

	sess = ft_sess_get(lport, sid);
	if (!sess) {
		pr_debug("sid %x sess lookup failed\n", sid);
		/* TBD XXX - if FCP_CMND, send PRLO */
		fc_frame_free(fp);
		return;
	}
	ft_recv_req(sess, fp);	/* must do ft_sess_put() */
}

/*
 * Provider ops for libfc.
 */
struct fc4_prov ft_prov = {
	.prli = ft_prli,
	.prlo = ft_prlo,
	.recv = ft_recv,
	.module = THIS_MODULE,
};
Commit	Line	Data
3699d92a KP	1	/*
	2	* Copyright (c) 2010 Cisco Systems, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	/* XXX TBD some includes may be extraneous */
	19
	20	#include <linux/module.h>
	21	#include <linux/moduleparam.h>
3699d92a KP	22	#include <linux/utsname.h>
	23	#include <linux/init.h>
	24	#include <linux/slab.h>
	25	#include <linux/kthread.h>
	26	#include <linux/types.h>
	27	#include <linux/string.h>
	28	#include <linux/configfs.h>
	29	#include <linux/ctype.h>
	30	#include <linux/hash.h>
	31	#include <linux/rcupdate.h>
	32	#include <linux/rculist.h>
	33	#include <linux/kref.h>
	34	#include <asm/unaligned.h>
	35	#include <scsi/scsi.h>
	36	#include <scsi/scsi_host.h>
	37	#include <scsi/scsi_device.h>
	38	#include <scsi/scsi_cmnd.h>
	39	#include <scsi/libfc.h>
	40
	41	#include <target/target_core_base.h>
c4795fb2	42	#include <target/target_core_fabric.h>
3699d92a	43	#include <target/target_core_configfs.h>
3699d92a KP	44	#include <target/configfs_macros.h>
3699d92a KP	45
3699d92a KP	46	#include "tcm_fc.h"
	47
	48	static void ft_sess_delete_all(struct ft_tport *);
	49
	50	/*
	51	* Lookup or allocate target local port.
	52	* Caller holds ft_lport_lock.
	53	*/
	54	static struct ft_tport ft_tport_create(struct fc_lport lport)
	55	{
	56	struct ft_tpg *tpg;
	57	struct ft_tport *tport;
	58	int i;
	59
863555be MR	60	tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
863555be MR	61	lockdep_is_held(&ft_lport_lock));
3699d92a KP	62	if (tport && tport->tpg)
	63	return tport;
	64
	65	tpg = ft_lport_find_tpg(lport);
	66	if (!tpg)
	67	return NULL;
	68
	69	if (tport) {
	70	tport->tpg = tpg;
	71	return tport;
	72	}
	73
	74	tport = kzalloc(sizeof(*tport), GFP_KERNEL);
	75	if (!tport)
	76	return NULL;
	77
	78	tport->lport = lport;
	79	tport->tpg = tpg;
	80	tpg->tport = tport;
	81	for (i = 0; i < FT_SESS_HASH_SIZE; i++)
	82	INIT_HLIST_HEAD(&tport->hash[i]);
	83
	84	rcu_assign_pointer(lport->prov[FC_TYPE_FCP], tport);
	85	return tport;
	86	}
	87
3699d92a KP	88	/*
	89	* Delete a target local port.
	90	* Caller holds ft_lport_lock.
	91	*/
	92	static void ft_tport_delete(struct ft_tport *tport)
	93	{
	94	struct fc_lport *lport;
	95	struct ft_tpg *tpg;
	96
	97	ft_sess_delete_all(tport);
	98	lport = tport->lport;
	99	BUG_ON(tport != lport->prov[FC_TYPE_FCP]);
	100	rcu_assign_pointer(lport->prov[FC_TYPE_FCP], NULL);
	101
	102	tpg = tport->tpg;
	103	if (tpg) {
	104	tpg->tport = NULL;
	105	tport->tpg = NULL;
	106	}
a6c76da8	107	kfree_rcu(tport, rcu);
3699d92a KP	108	}
	109
	110	/*
	111	* Add local port.
	112	* Called thru fc_lport_iterate().
	113	*/
	114	void ft_lport_add(struct fc_lport lport, void arg)
	115	{
	116	mutex_lock(&ft_lport_lock);
	117	ft_tport_create(lport);
	118	mutex_unlock(&ft_lport_lock);
	119	}
	120
	121	/*
	122	* Delete local port.
	123	* Called thru fc_lport_iterate().
	124	*/
	125	void ft_lport_del(struct fc_lport lport, void arg)
	126	{
	127	struct ft_tport *tport;
	128
	129	mutex_lock(&ft_lport_lock);
	130	tport = lport->prov[FC_TYPE_FCP];
	131	if (tport)
	132	ft_tport_delete(tport);
	133	mutex_unlock(&ft_lport_lock);
	134	}
	135
	136	/*
	137	* Notification of local port change from libfc.
	138	* Create or delete local port and associated tport.
	139	*/
	140	int ft_lport_notify(struct notifier_block nb, unsigned long event, void arg)
	141	{
	142	struct fc_lport *lport = arg;
	143
	144	switch (event) {
	145	case FC_LPORT_EV_ADD:
	146	ft_lport_add(lport, NULL);
	147	break;
	148	case FC_LPORT_EV_DEL:
	149	ft_lport_del(lport, NULL);
	150	break;
	151	}
	152	return NOTIFY_DONE;
	153	}
	154
	155	/*
	156	* Hash function for FC_IDs.
	157	*/
	158	static u32 ft_sess_hash(u32 port_id)
	159	{
	160	return hash_32(port_id, FT_SESS_HASH_BITS);
	161	}
	162
	163	/*
	164	* Find session in local port.
	165	* Sessions and hash lists are RCU-protected.
	166	* A reference is taken which must be eventually freed.
	167	*/
	168	static struct ft_sess ft_sess_get(struct fc_lport lport, u32 port_id)
	169	{
	170	struct ft_tport *tport;
	171	struct hlist_head *head;
172	struct hlist_node *pos;
173	struct ft_sess *sess;
174
175	rcu_read_lock();
176	tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
177	if (!tport)
178	goto out;
179
180	head = &tport->hash[ft_sess_hash(port_id)];
181	hlist_for_each_entry_rcu(sess, pos, head, hash) {
182	if (sess->port_id == port_id) {
183	kref_get(&sess->kref);
184	rcu_read_unlock();
6708bb27	185	pr_debug("port_id %x found %p\n", port_id, sess);
3699d92a KP	186	return sess;
	187	}
	188	}
	189	out:
	190	rcu_read_unlock();
6708bb27	191	pr_debug("port_id %x not found\n", port_id);
3699d92a KP	192	return NULL;
	193	}
	194
	195	/*
	196	* Allocate session and enter it in the hash for the local port.
	197	* Caller holds ft_lport_lock.
	198	*/
	199	static struct ft_sess ft_sess_create(struct ft_tport tport, u32 port_id,
	200	struct ft_node_acl *acl)
	201	{
	202	struct ft_sess *sess;
	203	struct hlist_head *head;
	204	struct hlist_node *pos;
	205
	206	head = &tport->hash[ft_sess_hash(port_id)];
	207	hlist_for_each_entry_rcu(sess, pos, head, hash)
	208	if (sess->port_id == port_id)
	209	return sess;
	210
	211	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
	212	if (!sess)
	213	return NULL;
	214
	215	sess->se_sess = transport_init_session();
552523dc	216	if (IS_ERR(sess->se_sess)) {
3699d92a KP	217	kfree(sess);
	218	return NULL;
	219	}
	220	sess->se_sess->se_node_acl = &acl->se_node_acl;
	221	sess->tport = tport;
	222	sess->port_id = port_id;
	223	kref_init(&sess->kref); /* ref for table entry */
	224	hlist_add_head_rcu(&sess->hash, head);
	225	tport->sess_count++;
	226
6708bb27	227	pr_debug("port_id %x sess %p\n", port_id, sess);
3699d92a KP	228
	229	transport_register_session(&tport->tpg->se_tpg, &acl->se_node_acl,
	230	sess->se_sess, sess);
	231	return sess;
	232	}
	233
	234	/*
	235	* Unhash the session.
	236	* Caller holds ft_lport_lock.
	237	*/
	238	static void ft_sess_unhash(struct ft_sess *sess)
	239	{
	240	struct ft_tport *tport = sess->tport;
	241
	242	hlist_del_rcu(&sess->hash);
	243	BUG_ON(!tport->sess_count);
	244	tport->sess_count--;
	245	sess->port_id = -1;
	246	sess->params = 0;
	247	}
	248
	249	/*
	250	* Delete session from hash.
	251	* Caller holds ft_lport_lock.
	252	*/
	253	static struct ft_sess ft_sess_delete(struct ft_tport tport, u32 port_id)
	254	{
	255	struct hlist_head *head;
	256	struct hlist_node *pos;
	257	struct ft_sess *sess;
	258
	259	head = &tport->hash[ft_sess_hash(port_id)];
	260	hlist_for_each_entry_rcu(sess, pos, head, hash) {
	261	if (sess->port_id == port_id) {
	262	ft_sess_unhash(sess);
	263	return sess;
	264	}
	265	}
	266	return NULL;
	267	}
	268
	269	/*
	270	* Delete all sessions from tport.
	271	* Caller holds ft_lport_lock.
	272	*/
	273	static void ft_sess_delete_all(struct ft_tport *tport)
	274	{
	275	struct hlist_head *head;
	276	struct hlist_node *pos;
	277	struct ft_sess *sess;
	278
	279	for (head = tport->hash;
	280	head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
	281	hlist_for_each_entry_rcu(sess, pos, head, hash) {
	282	ft_sess_unhash(sess);
	283	transport_deregister_session_configfs(sess->se_sess);
	284	ft_sess_put(sess); /* release from table */
	285	}
	286	}
	287	}
	288
	289	/*
	290	* TCM ops for sessions.
	291	*/
292
293	/*
294	* Determine whether session is allowed to be shutdown in the current context.
295	* Returns non-zero if the session should be shutdown.
296	*/
297	int ft_sess_shutdown(struct se_session *se_sess)
298	{
299	struct ft_sess *sess = se_sess->fabric_sess_ptr;
300
6708bb27	301	pr_debug("port_id %x\n", sess->port_id);
3699d92a KP	302	return 1;
	303	}
	304
	305	/*
	306	* Remove session and send PRLO.
	307	* This is called when the ACL is being deleted or queue depth is changing.
	308	*/
	309	void ft_sess_close(struct se_session *se_sess)
	310	{
	311	struct ft_sess *sess = se_sess->fabric_sess_ptr;
3699d92a KP	312	u32 port_id;
	313
	314	mutex_lock(&ft_lport_lock);
3699d92a KP	315	port_id = sess->port_id;
3699d92a KP	316	if (port_id == -1) {
7c7cf3b9	317	mutex_unlock(&ft_lport_lock);
3699d92a KP	318	return;
3699d92a KP	319	}
6708bb27	320	pr_debug("port_id %x\n", port_id);
3699d92a KP	321	ft_sess_unhash(sess);
	322	mutex_unlock(&ft_lport_lock);
	323	transport_deregister_session_configfs(se_sess);
	324	ft_sess_put(sess);
	325	/* XXX Send LOGO or PRLO */
	326	synchronize_rcu(); /* let transport deregister happen */
	327	}
	328
3699d92a KP	329	u32 ft_sess_get_index(struct se_session *se_sess)
	330	{
	331	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	332
	333	return sess->port_id; /* XXX TBD probably not what is needed */
	334	}
	335
	336	u32 ft_sess_get_port_name(struct se_session *se_sess,
	337	unsigned char *buf, u32 len)
	338	{
	339	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	340
	341	return ft_format_wwn(buf, len, sess->port_name);
	342	}
	343
3699d92a KP	344	/*
	345	* libfc ops involving sessions.
	346	*/
	347
	348	static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len,
	349	const struct fc_els_spp rspp, struct fc_els_spp spp)
	350	{
	351	struct ft_tport *tport;
	352	struct ft_sess *sess;
	353	struct ft_node_acl *acl;
	354	u32 fcp_parm;
	355
	356	tport = ft_tport_create(rdata->local_port);
	357	if (!tport)
	358	return 0; /* not a target for this local port */
	359
	360	acl = ft_acl_get(tport->tpg, rdata);
	361	if (!acl)
	362	return 0;
	363
	364	if (!rspp)
	365	goto fill;
	366
	367	if (rspp->spp_flags & (FC_SPP_OPA_VAL \| FC_SPP_RPA_VAL))
	368	return FC_SPP_RESP_NO_PA;
	369
	370	/*
	371	* If both target and initiator bits are off, the SPP is invalid.
	372	*/
	373	fcp_parm = ntohl(rspp->spp_params);
	374	if (!(fcp_parm & (FCP_SPPF_INIT_FCN \| FCP_SPPF_TARG_FCN)))
	375	return FC_SPP_RESP_INVL;
	376
	377	/*
	378	* Create session (image pair) only if requested by
	379	* EST_IMG_PAIR flag and if the requestor is an initiator.
	380	*/
	381	if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) {
	382	spp->spp_flags \|= FC_SPP_EST_IMG_PAIR;
	383	if (!(fcp_parm & FCP_SPPF_INIT_FCN))
	384	return FC_SPP_RESP_CONF;
	385	sess = ft_sess_create(tport, rdata->ids.port_id, acl);
	386	if (!sess)
	387	return FC_SPP_RESP_RES;
	388	if (!sess->params)
	389	rdata->prli_count++;
	390	sess->params = fcp_parm;
	391	sess->port_name = rdata->ids.port_name;
	392	sess->max_frame = rdata->maxframe_size;
	393
	394	/* XXX TBD - clearing actions. unit attn, see 4.10 */
	395	}
	396
	397	/*
	398	* OR in our service parameters with other provider (initiator), if any.
3699d92a KP	399	*/
	400	fill:
	401	fcp_parm = ntohl(spp->spp_params);
f2eeba21	402	fcp_parm &= ~FCP_SPPF_RETRY;
3699d92a KP	403	spp->spp_params = htonl(fcp_parm \| FCP_SPPF_TARG_FCN);
	404	return FC_SPP_RESP_ACK;
	405	}
	406
	407	/**
	408	* tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target
	409	* @rdata: remote port private
	410	* @spp_len: service parameter page length
	411	* @rspp: received service parameter page (NULL for outgoing PRLI)
	412	* @spp: response service parameter page
	413	*
	414	* Returns spp response code.
	415	*/
	416	static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len,
	417	const struct fc_els_spp rspp, struct fc_els_spp spp)
	418	{
	419	int ret;
	420
	421	mutex_lock(&ft_lport_lock);
	422	ret = ft_prli_locked(rdata, spp_len, rspp, spp);
	423	mutex_unlock(&ft_lport_lock);
6708bb27	424	pr_debug("port_id %x flags %x ret %x\n",
3699d92a KP	425	rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret);
	426	return ret;
	427	}
	428
	429	static void ft_sess_rcu_free(struct rcu_head *rcu)
	430	{
	431	struct ft_sess *sess = container_of(rcu, struct ft_sess, rcu);
	432
3699d92a KP	433	kfree(sess);
	434	}
	435
	436	static void ft_sess_free(struct kref *kref)
	437	{
	438	struct ft_sess *sess = container_of(kref, struct ft_sess, kref);
	439
9f4ad44b	440	transport_deregister_session(sess->se_sess);
3699d92a KP	441	call_rcu(&sess->rcu, ft_sess_rcu_free);
	442	}
	443
	444	void ft_sess_put(struct ft_sess *sess)
	445	{
	446	int sess_held = atomic_read(&sess->kref.refcount);
	447
	448	BUG_ON(!sess_held);
	449	kref_put(&sess->kref, ft_sess_free);
	450	}
	451
	452	static void ft_prlo(struct fc_rport_priv *rdata)
	453	{
	454	struct ft_sess *sess;
	455	struct ft_tport *tport;
	456
	457	mutex_lock(&ft_lport_lock);
08a16208 DE	458	tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP],
	459	lockdep_is_held(&ft_lport_lock));
	460
3699d92a KP	461	if (!tport) {
	462	mutex_unlock(&ft_lport_lock);
	463	return;
	464	}
	465	sess = ft_sess_delete(tport, rdata->ids.port_id);
	466	if (!sess) {
	467	mutex_unlock(&ft_lport_lock);
	468	return;
	469	}
	470	mutex_unlock(&ft_lport_lock);
	471	transport_deregister_session_configfs(sess->se_sess);
	472	ft_sess_put(sess); /* release from table */
	473	rdata->prli_count--;
	474	/* XXX TBD - clearing actions. unit attn, see 4.10 */
	475	}
	476
	477	/*
	478	* Handle incoming FCP request.
	479	* Caller has verified that the frame is type FCP.
	480	*/
	481	static void ft_recv(struct fc_lport lport, struct fc_frame fp)
	482	{
	483	struct ft_sess *sess;
	484	u32 sid = fc_frame_sid(fp);
	485
6708bb27	486	pr_debug("sid %x\n", sid);
3699d92a KP	487
	488	sess = ft_sess_get(lport, sid);
	489	if (!sess) {
6708bb27	490	pr_debug("sid %x sess lookup failed\n", sid);
3699d92a KP	491	/* TBD XXX - if FCP_CMND, send PRLO */
	492	fc_frame_free(fp);
	493	return;
	494	}
	495	ft_recv_req(sess, fp); /* must do ft_sess_put() */
	496	}
	497
	498	/*
	499	* Provider ops for libfc.
	500	*/
	501	struct fc4_prov ft_prov = {
	502	.prli = ft_prli,
	503	.prlo = ft_prlo,
	504	.recv = ft_recv,
	505	.module = THIS_MODULE,
	506	};