[mirror_ubuntu-artful-kernel.git] / drivers / scsi / scsi_transport_srp.c

/*
 * SCSI RDMA (SRP) transport class
 *
 * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 * This program is distributed in the hope that 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
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_srp.h>
#include "scsi_transport_srp_internal.h"

struct srp_host_attrs {
	atomic_t next_port_id;
};
#define to_srp_host_attrs(host)	((struct srp_host_attrs *)(host)->shost_data)

#define SRP_HOST_ATTRS 0
#define SRP_RPORT_ATTRS 2

struct srp_internal {
	struct scsi_transport_template t;
	struct srp_function_template *f;

	struct class_device_attribute *host_attrs[SRP_HOST_ATTRS + 1];

	struct class_device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
	struct class_device_attribute private_rport_attrs[SRP_RPORT_ATTRS];
	struct transport_container rport_attr_cont;
};

#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)

#define	dev_to_rport(d)	container_of(d, struct srp_rport, dev)
#define transport_class_to_srp_rport(cdev) dev_to_rport((cdev)->dev)

static int srp_host_setup(struct transport_container *tc, struct device *dev,
			  struct class_device *cdev)
{
	struct Scsi_Host *shost = dev_to_shost(dev);
	struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);

	atomic_set(&srp_host->next_port_id, 0);
	return 0;
}

static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
			       NULL, NULL);

static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
			       NULL, NULL, NULL);

#define SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm)	\
	i->private_##attrb[count] = class_device_attr_##field;		\
	i->private_##attrb[count].attr.mode = perm;			\
	if (ro_test) {							\
		i->private_##attrb[count].attr.mode = ro_perm;		\
		i->private_##attrb[count].store = NULL;			\
	}								\
	i->attrb[count] = &i->private_##attrb[count];			\
	if (test)							\
		count++

#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0)

#define SETUP_RPORT_ATTRIBUTE_RW(field)					\
	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO | S_IWUSR,		\
		       1, 1, S_IRUGO)

#define SRP_PID(p) \
	(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
	(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
	(p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \
	(p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15]

#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
	"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"

static ssize_t
show_srp_rport_id(struct class_device *cdev, char *buf)
{
	struct srp_rport *rport = transport_class_to_srp_rport(cdev);
	return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
}

static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);

static const struct {
	u32 value;
	char *name;
} srp_rport_role_names[] = {
	{SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
	{SRP_RPORT_ROLE_TARGET, "SRP Target"},
};

static ssize_t
show_srp_rport_roles(struct class_device *cdev, char *buf)
{
	struct srp_rport *rport = transport_class_to_srp_rport(cdev);
	int i;
	char *name = NULL;

	for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
		if (srp_rport_role_names[i].value == rport->roles) {
			name = srp_rport_role_names[i].name;
			break;
		}
	return sprintf(buf, "%s\n", name ? : "unknown");
}

static CLASS_DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);

static void srp_rport_release(struct device *dev)
{
	struct srp_rport *rport = dev_to_rport(dev);

	put_device(dev->parent);
	kfree(rport);
}

static int scsi_is_srp_rport(const struct device *dev)
{
	return dev->release == srp_rport_release;
}

static int srp_rport_match(struct attribute_container *cont,
			   struct device *dev)
{
	struct Scsi_Host *shost;
	struct srp_internal *i;

	if (!scsi_is_srp_rport(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt)
		return 0;
	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
		return 0;

	i = to_srp_internal(shost->transportt);
	return &i->rport_attr_cont.ac == cont;
}

static int srp_host_match(struct attribute_container *cont, struct device *dev)
{
	struct Scsi_Host *shost;
	struct srp_internal *i;

	if (!scsi_is_host_device(dev))
		return 0;

	shost = dev_to_shost(dev);
	if (!shost->transportt)
		return 0;
	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
		return 0;

	i = to_srp_internal(shost->transportt);
	return &i->t.host_attrs.ac == cont;
}

/**
 * srp_rport_add - add a SRP remote port to the device hierarchy
 *
 * @shost:	scsi host the remote port is connected to.
 * @ids:	The port id for the remote port.
 *
 * publishes a port to the rest of the system
 */
struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
				struct srp_rport_identifiers *ids)
{
	struct srp_rport *rport;
	struct device *parent = &shost->shost_gendev;
	int id, ret;

	rport = kzalloc(sizeof(*rport), GFP_KERNEL);
	if (!rport)
		return ERR_PTR(-ENOMEM);

	device_initialize(&rport->dev);

	rport->dev.parent = get_device(parent);
	rport->dev.release = srp_rport_release;

	memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
	rport->roles = ids->roles;

	id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
	sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id);

	transport_setup_device(&rport->dev);

	ret = device_add(&rport->dev);
	if (ret) {
		transport_destroy_device(&rport->dev);
		put_device(&rport->dev);
		return ERR_PTR(ret);
	}

	if (shost->active_mode & MODE_TARGET &&
	    ids->roles == SRP_RPORT_ROLE_INITIATOR) {
		ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
					      rport->port_id);
		if (ret) {
			device_del(&rport->dev);
			transport_destroy_device(&rport->dev);
			put_device(&rport->dev);
			return ERR_PTR(ret);
		}
	}

	transport_add_device(&rport->dev);
	transport_configure_device(&rport->dev);

	return rport;
}
EXPORT_SYMBOL_GPL(srp_rport_add);

/**
 * srp_rport_del  --  remove a SRP remote port
 * @port:	SRP remote port to remove
 *
 * Removes the specified SRP remote port.
 */
void srp_rport_del(struct srp_rport *rport)
{
	struct device *dev = &rport->dev;
	struct Scsi_Host *shost = dev_to_shost(dev->parent);

	if (shost->active_mode & MODE_TARGET &&
	    rport->roles == SRP_RPORT_ROLE_INITIATOR)
		srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
	put_device(dev);
}
EXPORT_SYMBOL_GPL(srp_rport_del);

static int do_srp_rport_del(struct device *dev, void *data)
{
	srp_rport_del(dev_to_rport(dev));
	return 0;
}

/**
 * srp_remove_host  --  tear down a Scsi_Host's SRP data structures
 * @shost:	Scsi Host that is torn down
 *
 * Removes all SRP remote ports for a given Scsi_Host.
 * Must be called just before scsi_remove_host for SRP HBAs.
 */
void srp_remove_host(struct Scsi_Host *shost)
{
	device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
}
EXPORT_SYMBOL_GPL(srp_remove_host);

static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
				 int result)
{
	struct srp_internal *i = to_srp_internal(shost->transportt);
	return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
}

static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
{
	struct srp_internal *i = to_srp_internal(shost->transportt);
	return i->f->it_nexus_response(shost, nexus, result);
}

/**
 * srp_attach_transport  --  instantiate SRP transport template
 * @ft:		SRP transport class function template
 */
struct scsi_transport_template *
srp_attach_transport(struct srp_function_template *ft)
{
	int count;
	struct srp_internal *i;

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

	i->t.tsk_mgmt_response = srp_tsk_mgmt_response;
	i->t.it_nexus_response = srp_it_nexus_response;

	i->t.host_size = sizeof(struct srp_host_attrs);
	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	i->t.host_attrs.ac.class = &srp_host_class.class;
	i->t.host_attrs.ac.match = srp_host_match;
	i->host_attrs[0] = NULL;
	transport_container_register(&i->t.host_attrs);

	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
	i->rport_attr_cont.ac.class = &srp_rport_class.class;
	i->rport_attr_cont.ac.match = srp_rport_match;
	transport_container_register(&i->rport_attr_cont);

	count = 0;
	SETUP_RPORT_ATTRIBUTE_RD(port_id);
	SETUP_RPORT_ATTRIBUTE_RD(roles);
	i->rport_attrs[count] = NULL;

	i->f = ft;

	return &i->t;
}
EXPORT_SYMBOL_GPL(srp_attach_transport);

/**
 * srp_release_transport  --  release SRP transport template instance
 * @t:		transport template instance
 */
void srp_release_transport(struct scsi_transport_template *t)
{
	struct srp_internal *i = to_srp_internal(t);

	transport_container_unregister(&i->t.host_attrs);
	transport_container_unregister(&i->rport_attr_cont);

	kfree(i);
}
EXPORT_SYMBOL_GPL(srp_release_transport);

static __init int srp_transport_init(void)
{
	int ret;

	ret = transport_class_register(&srp_host_class);
	if (ret)
		return ret;
	ret = transport_class_register(&srp_rport_class);
	if (ret)
		goto unregister_host_class;

	return 0;
unregister_host_class:
	transport_class_unregister(&srp_host_class);
	return ret;
}

static void __exit srp_transport_exit(void)
{
	transport_class_unregister(&srp_host_class);
	transport_class_unregister(&srp_rport_class);
}

MODULE_AUTHOR("FUJITA Tomonori");
MODULE_DESCRIPTION("SRP Transport Attributes");
MODULE_LICENSE("GPL");

module_init(srp_transport_init);
module_exit(srp_transport_exit);
Commit	Line	Data
09345f65 FT	1	/*
	2	* SCSI RDMA (SRP) transport class
	3	*
	4	* Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2 of the
	9	* License.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*/
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/jiffies.h>
	24	#include <linux/err.h>
	25	#include <linux/slab.h>
	26	#include <linux/string.h>
	27
	28	#include <scsi/scsi.h>
	29	#include <scsi/scsi_device.h>
	30	#include <scsi/scsi_host.h>
	31	#include <scsi/scsi_transport.h>
	32	#include <scsi/scsi_transport_srp.h>
0012fdf9	33	#include "scsi_transport_srp_internal.h"
09345f65 FT	34
	35	struct srp_host_attrs {
	36	atomic_t next_port_id;
	37	};
	38	#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
	39
	40	#define SRP_HOST_ATTRS 0
aebd5e47	41	#define SRP_RPORT_ATTRS 2
09345f65 FT	42
	43	struct srp_internal {
	44	struct scsi_transport_template t;
	45	struct srp_function_template *f;
	46
	47	struct class_device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
	48
	49	struct class_device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
	50	struct class_device_attribute private_rport_attrs[SRP_RPORT_ATTRS];
	51	struct transport_container rport_attr_cont;
	52	};
	53
	54	#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
	55
	56	#define dev_to_rport(d) container_of(d, struct srp_rport, dev)
	57	#define transport_class_to_srp_rport(cdev) dev_to_rport((cdev)->dev)
	58
	59	static int srp_host_setup(struct transport_container tc, struct device dev,
	60	struct class_device *cdev)
	61	{
	62	struct Scsi_Host *shost = dev_to_shost(dev);
	63	struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
	64
	65	atomic_set(&srp_host->next_port_id, 0);
	66	return 0;
	67	}
	68
	69	static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
	70	NULL, NULL);
	71
	72	static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
	73	NULL, NULL, NULL);
	74
	75	#define SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm) \
	76	i->private_##attrb[count] = class_device_attr_##field; \
	77	i->private_##attrb[count].attr.mode = perm; \
	78	if (ro_test) { \
	79	i->private_##attrb[count].attr.mode = ro_perm; \
	80	i->private_##attrb[count].store = NULL; \
	81	} \
	82	i->attrb[count] = &i->private_##attrb[count]; \
	83	if (test) \
	84	count++
	85
	86	#define SETUP_RPORT_ATTRIBUTE_RD(field) \
	87	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0)
	88
	89	#define SETUP_RPORT_ATTRIBUTE_RW(field) \
	90	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO \| S_IWUSR, \
	91	1, 1, S_IRUGO)
	92
	93	#define SRP_PID(p) \
	94	(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
	95	(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
	96	(p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \
	97	(p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15]
	98
	99	#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
	100	"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
	101
	102	static ssize_t
	103	show_srp_rport_id(struct class_device cdev, char buf)
	104	{
	105	struct srp_rport *rport = transport_class_to_srp_rport(cdev);
106	return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
107	}
108
109	static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
110
aebd5e47 FT	111	static const struct {
	112	u32 value;
	113	char *name;
	114	} srp_rport_role_names[] = {
	115	{SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
	116	{SRP_RPORT_ROLE_TARGET, "SRP Target"},
	117	};
	118
	119	static ssize_t
	120	show_srp_rport_roles(struct class_device cdev, char buf)
	121	{
	122	struct srp_rport *rport = transport_class_to_srp_rport(cdev);
	123	int i;
	124	char *name = NULL;
	125
	126	for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
	127	if (srp_rport_role_names[i].value == rport->roles) {
	128	name = srp_rport_role_names[i].name;
	129	break;
	130	}
	131	return sprintf(buf, "%s\n", name ? : "unknown");
	132	}
	133
	134	static CLASS_DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
	135
09345f65 FT	136	static void srp_rport_release(struct device *dev)
	137	{
	138	struct srp_rport *rport = dev_to_rport(dev);
	139
	140	put_device(dev->parent);
	141	kfree(rport);
	142	}
	143
	144	static int scsi_is_srp_rport(const struct device *dev)
	145	{
	146	return dev->release == srp_rport_release;
	147	}
	148
	149	static int srp_rport_match(struct attribute_container *cont,
	150	struct device *dev)
	151	{
	152	struct Scsi_Host *shost;
	153	struct srp_internal *i;
	154
	155	if (!scsi_is_srp_rport(dev))
	156	return 0;
	157
	158	shost = dev_to_shost(dev->parent);
	159	if (!shost->transportt)
	160	return 0;
	161	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
	162	return 0;
	163
	164	i = to_srp_internal(shost->transportt);
	165	return &i->rport_attr_cont.ac == cont;
	166	}
	167
	168	static int srp_host_match(struct attribute_container cont, struct device dev)
	169	{
	170	struct Scsi_Host *shost;
	171	struct srp_internal *i;
	172
	173	if (!scsi_is_host_device(dev))
	174	return 0;
	175
	176	shost = dev_to_shost(dev);
	177	if (!shost->transportt)
	178	return 0;
	179	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
	180	return 0;
	181
	182	i = to_srp_internal(shost->transportt);
	183	return &i->t.host_attrs.ac == cont;
	184	}
	185
	186	/**
	187	* srp_rport_add - add a SRP remote port to the device hierarchy
	188	*
	189	* @shost: scsi host the remote port is connected to.
	190	* @ids: The port id for the remote port.
	191	*
	192	* publishes a port to the rest of the system
	193	*/
	194	struct srp_rport srp_rport_add(struct Scsi_Host shost,
	195	struct srp_rport_identifiers *ids)
	196	{
	197	struct srp_rport *rport;
	198	struct device *parent = &shost->shost_gendev;
	199	int id, ret;
200
201	rport = kzalloc(sizeof(*rport), GFP_KERNEL);
202	if (!rport)
203	return ERR_PTR(-ENOMEM);
204
205	device_initialize(&rport->dev);
206
207	rport->dev.parent = get_device(parent);
208	rport->dev.release = srp_rport_release;
209
210	memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
aebd5e47	211	rport->roles = ids->roles;
09345f65 FT	212
	213	id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
	214	sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id);
	215
	216	transport_setup_device(&rport->dev);
	217
	218	ret = device_add(&rport->dev);
	219	if (ret) {
	220	transport_destroy_device(&rport->dev);
	221	put_device(&rport->dev);
	222	return ERR_PTR(ret);
	223	}
	224
72e39ea7 FT	225	if (shost->active_mode & MODE_TARGET &&
72e39ea7 FT	226	ids->roles == SRP_RPORT_ROLE_INITIATOR) {
0012fdf9 FT	227	ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
0012fdf9 FT	228	rport->port_id);
62fe8826 FT	229	if (ret) {
	230	device_del(&rport->dev);
	231	transport_destroy_device(&rport->dev);
	232	put_device(&rport->dev);
	233	return ERR_PTR(ret);
	234	}
	235	}
	236
09345f65 FT	237	transport_add_device(&rport->dev);
	238	transport_configure_device(&rport->dev);
	239
	240	return rport;
	241	}
	242	EXPORT_SYMBOL_GPL(srp_rport_add);
	243
	244	/**
	245	* srp_rport_del -- remove a SRP remote port
	246	* @port: SRP remote port to remove
	247	*
	248	* Removes the specified SRP remote port.
	249	*/
	250	void srp_rport_del(struct srp_rport *rport)
	251	{
	252	struct device *dev = &rport->dev;
72e39ea7	253	struct Scsi_Host *shost = dev_to_shost(dev->parent);
09345f65	254
72e39ea7 FT	255	if (shost->active_mode & MODE_TARGET &&
	256	rport->roles == SRP_RPORT_ROLE_INITIATOR)
	257	srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);
62fe8826	258
09345f65 FT	259	transport_remove_device(dev);
	260	device_del(dev);
	261	transport_destroy_device(dev);
	262	put_device(dev);
	263	}
	264	EXPORT_SYMBOL_GPL(srp_rport_del);
	265
	266	static int do_srp_rport_del(struct device dev, void data)
	267	{
	268	srp_rport_del(dev_to_rport(dev));
	269	return 0;
	270	}
	271
	272	/**
	273	* srp_remove_host -- tear down a Scsi_Host's SRP data structures
	274	* @shost: Scsi Host that is torn down
	275	*
	276	* Removes all SRP remote ports for a given Scsi_Host.
	277	* Must be called just before scsi_remove_host for SRP HBAs.
	278	*/
	279	void srp_remove_host(struct Scsi_Host *shost)
	280	{
	281	device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
	282	}
	283	EXPORT_SYMBOL_GPL(srp_remove_host);
	284
bfb74374 FT	285	static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
bfb74374 FT	286	int result)
62fe8826 FT	287	{
62fe8826 FT	288	struct srp_internal *i = to_srp_internal(shost->transportt);
bfb74374 FT	289	return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
	290	}
	291
	292	static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
	293	{
	294	struct srp_internal *i = to_srp_internal(shost->transportt);
	295	return i->f->it_nexus_response(shost, nexus, result);
62fe8826 FT	296	}
62fe8826 FT	297
09345f65 FT	298	/**
	299	* srp_attach_transport -- instantiate SRP transport template
	300	* @ft: SRP transport class function template
	301	*/
	302	struct scsi_transport_template *
	303	srp_attach_transport(struct srp_function_template *ft)
	304	{
	305	int count;
	306	struct srp_internal *i;
	307
	308	i = kzalloc(sizeof(*i), GFP_KERNEL);
	309	if (!i)
	310	return NULL;
	311
bfb74374	312	i->t.tsk_mgmt_response = srp_tsk_mgmt_response;
62fe8826 FT	313	i->t.it_nexus_response = srp_it_nexus_response;
62fe8826 FT	314
09345f65 FT	315	i->t.host_size = sizeof(struct srp_host_attrs);
	316	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	317	i->t.host_attrs.ac.class = &srp_host_class.class;
	318	i->t.host_attrs.ac.match = srp_host_match;
	319	i->host_attrs[0] = NULL;
	320	transport_container_register(&i->t.host_attrs);
	321
	322	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
	323	i->rport_attr_cont.ac.class = &srp_rport_class.class;
	324	i->rport_attr_cont.ac.match = srp_rport_match;
	325	transport_container_register(&i->rport_attr_cont);
	326
	327	count = 0;
	328	SETUP_RPORT_ATTRIBUTE_RD(port_id);
aebd5e47	329	SETUP_RPORT_ATTRIBUTE_RD(roles);
09345f65 FT	330	i->rport_attrs[count] = NULL;
	331
	332	i->f = ft;
	333
	334	return &i->t;
	335	}
	336	EXPORT_SYMBOL_GPL(srp_attach_transport);
	337
	338	/**
	339	* srp_release_transport -- release SRP transport template instance
	340	* @t: transport template instance
	341	*/
	342	void srp_release_transport(struct scsi_transport_template *t)
	343	{
	344	struct srp_internal *i = to_srp_internal(t);
	345
	346	transport_container_unregister(&i->t.host_attrs);
	347	transport_container_unregister(&i->rport_attr_cont);
	348
	349	kfree(i);
	350	}
	351	EXPORT_SYMBOL_GPL(srp_release_transport);
	352
	353	static __init int srp_transport_init(void)
	354	{
	355	int ret;
	356
	357	ret = transport_class_register(&srp_host_class);
	358	if (ret)
	359	return ret;
	360	ret = transport_class_register(&srp_rport_class);
	361	if (ret)
	362	goto unregister_host_class;
	363
	364	return 0;
	365	unregister_host_class:
	366	transport_class_unregister(&srp_host_class);
	367	return ret;
	368	}
	369
	370	static void __exit srp_transport_exit(void)
	371	{
	372	transport_class_unregister(&srp_host_class);
	373	transport_class_unregister(&srp_rport_class);
	374	}
	375
	376	MODULE_AUTHOR("FUJITA Tomonori");
	377	MODULE_DESCRIPTION("SRP Transport Attributes");
	378	MODULE_LICENSE("GPL");
	379
	380	module_init(srp_transport_init);
	381	module_exit(srp_transport_exit);