[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/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_get(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;
		tpg->tport = tport;
		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_INIT_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_get(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 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, 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;

	head = &tport->hash[ft_sess_hash(port_id)];
	hlist_for_each_entry_rcu(sess, 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_tags(TCM_FC_DEFAULT_TAGS,
						    sizeof(struct ft_cmd),
						    TARGET_PROT_NORMAL);
	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 ft_sess *sess;

	head = &tport->hash[ft_sess_hash(port_id)];
	hlist_for_each_entry_rcu(sess, 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 ft_sess *sess;

	for (head = tport->hash;
	     head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
		hlist_for_each_entry_rcu(sess, 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_get(rdata->local_port);
	if (!tport)
		goto not_target;	/* not a target for this local port */

	acl = ft_acl_get(tport->tpg, rdata);
	if (!acl)
		goto not_target;	/* no target for this remote */

	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;

not_target:
	fcp_parm = ntohl(spp->spp_params);
	fcp_parm &= ~FCP_SPPF_TARG_FCN;
	spp->spp_params = htonl(fcp_parm);
	return 0;
}

/**
 * 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_free(struct kref *kref)
{
	struct ft_sess *sess = container_of(kref, struct ft_sess, kref);

	transport_deregister_session(sess->se_sess);
	kfree_rcu(sess, rcu);
}

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 KP	43	#include <target/configfs_macros.h>
3699d92a KP	44
3699d92a KP	45	#include "tcm_fc.h"
	46
	47	static void ft_sess_delete_all(struct ft_tport *);
	48
	49	/*
	50	* Lookup or allocate target local port.
	51	* Caller holds ft_lport_lock.
	52	*/
e3d4440c	53	static struct ft_tport ft_tport_get(struct fc_lport lport)
3699d92a KP	54	{
	55	struct ft_tpg *tpg;
	56	struct ft_tport *tport;
	57	int i;
	58
863555be MR	59	tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
863555be MR	60	lockdep_is_held(&ft_lport_lock));
3699d92a KP	61	if (tport && tport->tpg)
	62	return tport;
	63
	64	tpg = ft_lport_find_tpg(lport);
	65	if (!tpg)
	66	return NULL;
	67
	68	if (tport) {
	69	tport->tpg = tpg;
2c42be2d	70	tpg->tport = tport;
3699d92a KP	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]);
c04047ec	100	RCU_INIT_POINTER(lport->prov[FC_TYPE_FCP], NULL);
3699d92a KP	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);
e3d4440c	117	ft_tport_get(lport);
3699d92a KP	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;
3699d92a KP	172	struct ft_sess *sess;
	173
	174	rcu_read_lock();
	175	tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
	176	if (!tport)
	177	goto out;
	178
	179	head = &tport->hash[ft_sess_hash(port_id)];
b67bfe0d	180	hlist_for_each_entry_rcu(sess, head, hash) {
3699d92a KP	181	if (sess->port_id == port_id) {
	182	kref_get(&sess->kref);
	183	rcu_read_unlock();
6708bb27	184	pr_debug("port_id %x found %p\n", port_id, sess);
3699d92a KP	185	return sess;
	186	}
	187	}
	188	out:
	189	rcu_read_unlock();
6708bb27	190	pr_debug("port_id %x not found\n", port_id);
3699d92a KP	191	return NULL;
	192	}
	193
	194	/*
	195	* Allocate session and enter it in the hash for the local port.
	196	* Caller holds ft_lport_lock.
	197	*/
	198	static struct ft_sess ft_sess_create(struct ft_tport tport, u32 port_id,
	199	struct ft_node_acl *acl)
	200	{
	201	struct ft_sess *sess;
	202	struct hlist_head *head;
3699d92a KP	203
3699d92a KP	204	head = &tport->hash[ft_sess_hash(port_id)];
b67bfe0d	205	hlist_for_each_entry_rcu(sess, head, hash)
3699d92a KP	206	if (sess->port_id == port_id)
	207	return sess;
	208
	209	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
	210	if (!sess)
	211	return NULL;
	212
5f544cfa	213	sess->se_sess = transport_init_session_tags(TCM_FC_DEFAULT_TAGS,
e70beee7 NB	214	sizeof(struct ft_cmd),
e70beee7 NB	215	TARGET_PROT_NORMAL);
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;
3699d92a KP	256	struct ft_sess *sess;
	257
	258	head = &tport->hash[ft_sess_hash(port_id)];
b67bfe0d	259	hlist_for_each_entry_rcu(sess, head, hash) {
3699d92a KP	260	if (sess->port_id == port_id) {
	261	ft_sess_unhash(sess);
	262	return sess;
	263	}
	264	}
	265	return NULL;
	266	}
	267
	268	/*
	269	* Delete all sessions from tport.
	270	* Caller holds ft_lport_lock.
	271	*/
	272	static void ft_sess_delete_all(struct ft_tport *tport)
	273	{
	274	struct hlist_head *head;
3699d92a KP	275	struct ft_sess *sess;
	276
	277	for (head = tport->hash;
	278	head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
b67bfe0d	279	hlist_for_each_entry_rcu(sess, head, hash) {
3699d92a KP	280	ft_sess_unhash(sess);
	281	transport_deregister_session_configfs(sess->se_sess);
	282	ft_sess_put(sess); /* release from table */
	283	}
	284	}
	285	}
	286
	287	/*
	288	* TCM ops for sessions.
	289	*/
	290
	291	/*
	292	* Determine whether session is allowed to be shutdown in the current context.
	293	* Returns non-zero if the session should be shutdown.
	294	*/
	295	int ft_sess_shutdown(struct se_session *se_sess)
	296	{
	297	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	298
6708bb27	299	pr_debug("port_id %x\n", sess->port_id);
3699d92a KP	300	return 1;
	301	}
	302
	303	/*
	304	* Remove session and send PRLO.
	305	* This is called when the ACL is being deleted or queue depth is changing.
	306	*/
	307	void ft_sess_close(struct se_session *se_sess)
	308	{
	309	struct ft_sess *sess = se_sess->fabric_sess_ptr;
3699d92a KP	310	u32 port_id;
	311
	312	mutex_lock(&ft_lport_lock);
3699d92a KP	313	port_id = sess->port_id;
3699d92a KP	314	if (port_id == -1) {
7c7cf3b9	315	mutex_unlock(&ft_lport_lock);
3699d92a KP	316	return;
3699d92a KP	317	}
6708bb27	318	pr_debug("port_id %x\n", port_id);
3699d92a KP	319	ft_sess_unhash(sess);
	320	mutex_unlock(&ft_lport_lock);
	321	transport_deregister_session_configfs(se_sess);
	322	ft_sess_put(sess);
	323	/* XXX Send LOGO or PRLO */
	324	synchronize_rcu(); /* let transport deregister happen */
	325	}
	326
3699d92a KP	327	u32 ft_sess_get_index(struct se_session *se_sess)
	328	{
	329	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	330
	331	return sess->port_id; /* XXX TBD probably not what is needed */
	332	}
	333
	334	u32 ft_sess_get_port_name(struct se_session *se_sess,
	335	unsigned char *buf, u32 len)
	336	{
	337	struct ft_sess *sess = se_sess->fabric_sess_ptr;
	338
	339	return ft_format_wwn(buf, len, sess->port_name);
	340	}
	341
3699d92a KP	342	/*
	343	* libfc ops involving sessions.
	344	*/
	345
	346	static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len,
	347	const struct fc_els_spp rspp, struct fc_els_spp spp)
	348	{
	349	struct ft_tport *tport;
	350	struct ft_sess *sess;
	351	struct ft_node_acl *acl;
	352	u32 fcp_parm;
	353
e3d4440c	354	tport = ft_tport_get(rdata->local_port);
3699d92a	355	if (!tport)
edec8dfe	356	goto not_target; /* not a target for this local port */
3699d92a KP	357
	358	acl = ft_acl_get(tport->tpg, rdata);
	359	if (!acl)
edec8dfe	360	goto not_target; /* no target for this remote */
3699d92a KP	361
	362	if (!rspp)
	363	goto fill;
	364
	365	if (rspp->spp_flags & (FC_SPP_OPA_VAL \| FC_SPP_RPA_VAL))
	366	return FC_SPP_RESP_NO_PA;
	367
	368	/*
	369	* If both target and initiator bits are off, the SPP is invalid.
	370	*/
	371	fcp_parm = ntohl(rspp->spp_params);
	372	if (!(fcp_parm & (FCP_SPPF_INIT_FCN \| FCP_SPPF_TARG_FCN)))
	373	return FC_SPP_RESP_INVL;
	374
	375	/*
	376	* Create session (image pair) only if requested by
	377	* EST_IMG_PAIR flag and if the requestor is an initiator.
	378	*/
	379	if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) {
	380	spp->spp_flags \|= FC_SPP_EST_IMG_PAIR;
	381	if (!(fcp_parm & FCP_SPPF_INIT_FCN))
	382	return FC_SPP_RESP_CONF;
	383	sess = ft_sess_create(tport, rdata->ids.port_id, acl);
	384	if (!sess)
	385	return FC_SPP_RESP_RES;
	386	if (!sess->params)
	387	rdata->prli_count++;
	388	sess->params = fcp_parm;
	389	sess->port_name = rdata->ids.port_name;
	390	sess->max_frame = rdata->maxframe_size;
	391
	392	/* XXX TBD - clearing actions. unit attn, see 4.10 */
	393	}
	394
	395	/*
	396	* OR in our service parameters with other provider (initiator), if any.
3699d92a KP	397	*/
	398	fill:
	399	fcp_parm = ntohl(spp->spp_params);
f2eeba21	400	fcp_parm &= ~FCP_SPPF_RETRY;
3699d92a KP	401	spp->spp_params = htonl(fcp_parm \| FCP_SPPF_TARG_FCN);
3699d92a KP	402	return FC_SPP_RESP_ACK;
edec8dfe MR	403
	404	not_target:
	405	fcp_parm = ntohl(spp->spp_params);
	406	fcp_parm &= ~FCP_SPPF_TARG_FCN;
	407	spp->spp_params = htonl(fcp_parm);
	408	return 0;
3699d92a KP	409	}
	410
	411	/**
	412	* tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target
	413	* @rdata: remote port private
	414	* @spp_len: service parameter page length
	415	* @rspp: received service parameter page (NULL for outgoing PRLI)
	416	* @spp: response service parameter page
	417	*
	418	* Returns spp response code.
	419	*/
	420	static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len,
	421	const struct fc_els_spp rspp, struct fc_els_spp spp)
	422	{
	423	int ret;
	424
	425	mutex_lock(&ft_lport_lock);
	426	ret = ft_prli_locked(rdata, spp_len, rspp, spp);
	427	mutex_unlock(&ft_lport_lock);
6708bb27	428	pr_debug("port_id %x flags %x ret %x\n",
3699d92a KP	429	rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret);
	430	return ret;
	431	}
	432
3699d92a KP	433	static void ft_sess_free(struct kref *kref)
	434	{
	435	struct ft_sess *sess = container_of(kref, struct ft_sess, kref);
	436
9f4ad44b	437	transport_deregister_session(sess->se_sess);
a6ad57ef	438	kfree_rcu(sess, rcu);
3699d92a KP	439	}
	440
	441	void ft_sess_put(struct ft_sess *sess)
	442	{
	443	int sess_held = atomic_read(&sess->kref.refcount);
	444
	445	BUG_ON(!sess_held);
	446	kref_put(&sess->kref, ft_sess_free);
	447	}
	448
	449	static void ft_prlo(struct fc_rport_priv *rdata)
	450	{
	451	struct ft_sess *sess;
	452	struct ft_tport *tport;
	453
	454	mutex_lock(&ft_lport_lock);
08a16208 DE	455	tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP],
	456	lockdep_is_held(&ft_lport_lock));
	457
3699d92a KP	458	if (!tport) {
	459	mutex_unlock(&ft_lport_lock);
	460	return;
	461	}
	462	sess = ft_sess_delete(tport, rdata->ids.port_id);
	463	if (!sess) {
	464	mutex_unlock(&ft_lport_lock);
	465	return;
	466	}
	467	mutex_unlock(&ft_lport_lock);
	468	transport_deregister_session_configfs(sess->se_sess);
	469	ft_sess_put(sess); /* release from table */
	470	rdata->prli_count--;
	471	/* XXX TBD - clearing actions. unit attn, see 4.10 */
	472	}
	473
	474	/*
	475	* Handle incoming FCP request.
	476	* Caller has verified that the frame is type FCP.
	477	*/
	478	static void ft_recv(struct fc_lport lport, struct fc_frame fp)
	479	{
	480	struct ft_sess *sess;
	481	u32 sid = fc_frame_sid(fp);
	482
6708bb27	483	pr_debug("sid %x\n", sid);
3699d92a KP	484
	485	sess = ft_sess_get(lport, sid);
	486	if (!sess) {
6708bb27	487	pr_debug("sid %x sess lookup failed\n", sid);
3699d92a KP	488	/* TBD XXX - if FCP_CMND, send PRLO */
	489	fc_frame_free(fp);
	490	return;
	491	}
	492	ft_recv_req(sess, fp); /* must do ft_sess_put() */
	493	}
	494
	495	/*
	496	* Provider ops for libfc.
	497	*/
	498	struct fc4_prov ft_prov = {
	499	.prli = ft_prli,
	500	.prlo = ft_prlo,
	501	.recv = ft_recv,
	502	.module = THIS_MODULE,
	503	};