[GitHub/mt8127/android_kernel_alcatel_ttab.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 3

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

	struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];

	struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
	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(dev) dev_to_rport((dev)->parent)

static int srp_host_setup(struct transport_container *tc, struct device *dev,
			  struct 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 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 device *dev, struct device_attribute *attr,
		  char *buf)
{
	struct srp_rport *rport = transport_class_to_srp_rport(dev);
	return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
}

static 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 device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct srp_rport *rport = transport_class_to_srp_rport(dev);
	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 DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);

static ssize_t store_srp_rport_delete(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct srp_rport *rport = transport_class_to_srp_rport(dev);
	struct Scsi_Host *shost = dev_to_shost(dev);
	struct srp_internal *i = to_srp_internal(shost->transportt);

	if (i->f->rport_delete) {
		i->f->rport_delete(rport);
		return count;
	} else {
		return -ENOSYS;
	}
}

static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);

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);
	dev_set_name(&rport->dev, "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
 * @rport:	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)
{
	if (scsi_is_srp_rport(dev))
		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;

	count = 0;
	i->rport_attrs[count++] = &dev_attr_port_id;
	i->rport_attrs[count++] = &dev_attr_roles;
	if (ft->rport_delete)
		i->rport_attrs[count++] = &dev_attr_delete;
	i->rport_attrs[count++] = NULL;
	BUG_ON(count > ARRAY_SIZE(i->rport_attrs));

	transport_container_register(&i->rport_attr_cont);

	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
dc1bdbd9	41	#define SRP_RPORT_ATTRS 3
09345f65 FT	42
	43	struct srp_internal {
	44	struct scsi_transport_template t;
	45	struct srp_function_template *f;
	46
ee959b00	47	struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
09345f65	48
ee959b00	49	struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
09345f65 FT	50	struct transport_container rport_attr_cont;
	51	};
	52
	53	#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
	54
	55	#define dev_to_rport(d) container_of(d, struct srp_rport, dev)
ee959b00	56	#define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)
09345f65 FT	57
09345f65 FT	58	static int srp_host_setup(struct transport_container tc, struct device dev,
ee959b00	59	struct device *cdev)
09345f65 FT	60	{
	61	struct Scsi_Host *shost = dev_to_shost(dev);
	62	struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
	63
	64	atomic_set(&srp_host->next_port_id, 0);
	65	return 0;
	66	}
	67
	68	static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
	69	NULL, NULL);
	70
	71	static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
	72	NULL, NULL, NULL);
	73
09345f65 FT	74	#define SRP_PID(p) \
	75	(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
	76	(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
	77	(p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \
	78	(p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15]
	79
	80	#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
	81	"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
	82
	83	static ssize_t
ee959b00 TJ	84	show_srp_rport_id(struct device dev, struct device_attribute attr,
ee959b00 TJ	85	char *buf)
09345f65	86	{
ee959b00	87	struct srp_rport *rport = transport_class_to_srp_rport(dev);
09345f65 FT	88	return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
	89	}
	90
ee959b00	91	static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
09345f65	92
aebd5e47 FT	93	static const struct {
	94	u32 value;
	95	char *name;
	96	} srp_rport_role_names[] = {
	97	{SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
	98	{SRP_RPORT_ROLE_TARGET, "SRP Target"},
	99	};
	100
	101	static ssize_t
ee959b00 TJ	102	show_srp_rport_roles(struct device dev, struct device_attribute attr,
ee959b00 TJ	103	char *buf)
aebd5e47	104	{
ee959b00	105	struct srp_rport *rport = transport_class_to_srp_rport(dev);
aebd5e47 FT	106	int i;
	107	char *name = NULL;
	108
	109	for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
	110	if (srp_rport_role_names[i].value == rport->roles) {
	111	name = srp_rport_role_names[i].name;
	112	break;
	113	}
	114	return sprintf(buf, "%s\n", name ? : "unknown");
	115	}
	116
ee959b00	117	static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
aebd5e47	118
dc1bdbd9 BVA	119	static ssize_t store_srp_rport_delete(struct device *dev,
	120	struct device_attribute *attr,
	121	const char *buf, size_t count)
	122	{
	123	struct srp_rport *rport = transport_class_to_srp_rport(dev);
	124	struct Scsi_Host *shost = dev_to_shost(dev);
	125	struct srp_internal *i = to_srp_internal(shost->transportt);
	126
	127	if (i->f->rport_delete) {
	128	i->f->rport_delete(rport);
	129	return count;
	130	} else {
	131	return -ENOSYS;
	132	}
	133	}
	134
	135	static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);
	136
09345f65 FT	137	static void srp_rport_release(struct device *dev)
	138	{
	139	struct srp_rport *rport = dev_to_rport(dev);
	140
	141	put_device(dev->parent);
	142	kfree(rport);
	143	}
	144
	145	static int scsi_is_srp_rport(const struct device *dev)
	146	{
	147	return dev->release == srp_rport_release;
	148	}
	149
	150	static int srp_rport_match(struct attribute_container *cont,
	151	struct device *dev)
	152	{
	153	struct Scsi_Host *shost;
	154	struct srp_internal *i;
	155
	156	if (!scsi_is_srp_rport(dev))
	157	return 0;
	158
	159	shost = dev_to_shost(dev->parent);
	160	if (!shost->transportt)
	161	return 0;
	162	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
	163	return 0;
	164
	165	i = to_srp_internal(shost->transportt);
	166	return &i->rport_attr_cont.ac == cont;
	167	}
	168
	169	static int srp_host_match(struct attribute_container cont, struct device dev)
	170	{
	171	struct Scsi_Host *shost;
	172	struct srp_internal *i;
	173
	174	if (!scsi_is_host_device(dev))
	175	return 0;
	176
	177	shost = dev_to_shost(dev);
	178	if (!shost->transportt)
	179	return 0;
	180	if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
	181	return 0;
	182
	183	i = to_srp_internal(shost->transportt);
	184	return &i->t.host_attrs.ac == cont;
	185	}
	186
	187	/**
	188	* srp_rport_add - add a SRP remote port to the device hierarchy
09345f65 FT	189	* @shost: scsi host the remote port is connected to.
	190	* @ids: The port id for the remote port.
	191	*
dc8875e1	192	* Publishes a port to the rest of the system.
09345f65 FT	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
09345f65 FT	213	id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
71610f55	214	dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id);
09345f65 FT	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	/**
eb44820c RL	245	* srp_rport_del - remove a SRP remote port
eb44820c RL	246	* @rport: SRP remote port to remove
09345f65 FT	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	{
91183344 DD	268	if (scsi_is_srp_rport(dev))
91183344 DD	269	srp_rport_del(dev_to_rport(dev));
09345f65 FT	270	return 0;
	271	}
	272
	273	/**
eb44820c	274	* srp_remove_host - tear down a Scsi_Host's SRP data structures
09345f65 FT	275	* @shost: Scsi Host that is torn down
	276	*
	277	* Removes all SRP remote ports for a given Scsi_Host.
	278	* Must be called just before scsi_remove_host for SRP HBAs.
	279	*/
	280	void srp_remove_host(struct Scsi_Host *shost)
	281	{
	282	device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
	283	}
	284	EXPORT_SYMBOL_GPL(srp_remove_host);
	285
bfb74374 FT	286	static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
bfb74374 FT	287	int result)
62fe8826 FT	288	{
62fe8826 FT	289	struct srp_internal *i = to_srp_internal(shost->transportt);
bfb74374 FT	290	return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
	291	}
	292
	293	static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
	294	{
	295	struct srp_internal *i = to_srp_internal(shost->transportt);
	296	return i->f->it_nexus_response(shost, nexus, result);
62fe8826 FT	297	}
62fe8826 FT	298
09345f65	299	/**
eb44820c	300	* srp_attach_transport - instantiate SRP transport template
09345f65 FT	301	* @ft: SRP transport class function template
	302	*/
	303	struct scsi_transport_template *
	304	srp_attach_transport(struct srp_function_template *ft)
	305	{
	306	int count;
	307	struct srp_internal *i;
	308
	309	i = kzalloc(sizeof(*i), GFP_KERNEL);
	310	if (!i)
	311	return NULL;
	312
bfb74374	313	i->t.tsk_mgmt_response = srp_tsk_mgmt_response;
62fe8826 FT	314	i->t.it_nexus_response = srp_it_nexus_response;
62fe8826 FT	315
09345f65 FT	316	i->t.host_size = sizeof(struct srp_host_attrs);
	317	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	318	i->t.host_attrs.ac.class = &srp_host_class.class;
	319	i->t.host_attrs.ac.match = srp_host_match;
	320	i->host_attrs[0] = NULL;
	321	transport_container_register(&i->t.host_attrs);
	322
	323	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
	324	i->rport_attr_cont.ac.class = &srp_rport_class.class;
	325	i->rport_attr_cont.ac.match = srp_rport_match;
09345f65 FT	326
09345f65 FT	327	count = 0;
9134a855 BVA	328	i->rport_attrs[count++] = &dev_attr_port_id;
9134a855 BVA	329	i->rport_attrs[count++] = &dev_attr_roles;
dc1bdbd9 BVA	330	if (ft->rport_delete)
dc1bdbd9 BVA	331	i->rport_attrs[count++] = &dev_attr_delete;
9134a855 BVA	332	i->rport_attrs[count++] = NULL;
9134a855 BVA	333	BUG_ON(count > ARRAY_SIZE(i->rport_attrs));
09345f65	334
ac9be30e BVA	335	transport_container_register(&i->rport_attr_cont);
ac9be30e BVA	336
09345f65 FT	337	i->f = ft;
	338
	339	return &i->t;
	340	}
	341	EXPORT_SYMBOL_GPL(srp_attach_transport);
	342
	343	/**
eb44820c	344	* srp_release_transport - release SRP transport template instance
09345f65 FT	345	* @t: transport template instance
	346	*/
	347	void srp_release_transport(struct scsi_transport_template *t)
	348	{
	349	struct srp_internal *i = to_srp_internal(t);
	350
	351	transport_container_unregister(&i->t.host_attrs);
	352	transport_container_unregister(&i->rport_attr_cont);
	353
	354	kfree(i);
	355	}
	356	EXPORT_SYMBOL_GPL(srp_release_transport);
	357
	358	static __init int srp_transport_init(void)
	359	{
	360	int ret;
	361
	362	ret = transport_class_register(&srp_host_class);
	363	if (ret)
	364	return ret;
	365	ret = transport_class_register(&srp_rport_class);
	366	if (ret)
	367	goto unregister_host_class;
	368
	369	return 0;
	370	unregister_host_class:
	371	transport_class_unregister(&srp_host_class);
	372	return ret;
	373	}
	374
	375	static void __exit srp_transport_exit(void)
	376	{
	377	transport_class_unregister(&srp_host_class);
	378	transport_class_unregister(&srp_rport_class);
	379	}
	380
	381	MODULE_AUTHOR("FUJITA Tomonori");
	382	MODULE_DESCRIPTION("SRP Transport Attributes");
	383	MODULE_LICENSE("GPL");
	384
	385	module_init(srp_transport_init);
	386	module_exit(srp_transport_exit);