1/*
   2 * iSCSI transport class definitions
   3 *
   4 * Copyright (C) IBM Corporation, 2004
   5 * Copyright (C) Mike Christie, 2004 - 2005
   6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7 * Copyright (C) Alex Aizman, 2004 - 2005
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22 */
  23#include <linux/module.h>
  24#include <linux/mutex.h>
  25#include <linux/slab.h>
 
 
  26#include <net/tcp.h>
  27#include <scsi/scsi.h>
  28#include <scsi/scsi_host.h>
  29#include <scsi/scsi_device.h>
  30#include <scsi/scsi_transport.h>
  31#include <scsi/scsi_transport_iscsi.h>
  32#include <scsi/iscsi_if.h>
  33#include <scsi/scsi_cmnd.h>
  34
  35#define ISCSI_SESSION_ATTRS 23
  36#define ISCSI_CONN_ATTRS 13
  37#define ISCSI_HOST_ATTRS 4
  38
  39#define ISCSI_TRANSPORT_VERSION "2.0-870"
  40
  41static int dbg_session;
  42module_param_named(debug_session, dbg_session, int,
  43		   S_IRUGO | S_IWUSR);
  44MODULE_PARM_DESC(debug_session,
  45		 "Turn on debugging for sessions in scsi_transport_iscsi "
  46		 "module. Set to 1 to turn on, and zero to turn off. Default "
  47		 "is off.");
  48
  49static int dbg_conn;
  50module_param_named(debug_conn, dbg_conn, int,
  51		   S_IRUGO | S_IWUSR);
  52MODULE_PARM_DESC(debug_conn,
  53		 "Turn on debugging for connections in scsi_transport_iscsi "
  54		 "module. Set to 1 to turn on, and zero to turn off. Default "
  55		 "is off.");
  56
  57#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)		\
  58	do {								\
  59		if (dbg_session)					\
  60			iscsi_cls_session_printk(KERN_INFO, _session,	\
  61						 "%s: " dbg_fmt,	\
  62						 __func__, ##arg);	\
  63	} while (0);
  64
  65#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)			\
  66	do {								\
  67		if (dbg_conn)						\
  68			iscsi_cls_conn_printk(KERN_INFO, _conn,		\
  69					      "%s: " dbg_fmt,		\
  70					      __func__, ##arg);	\
  71	} while (0);
  72
  73struct iscsi_internal {
  74	struct scsi_transport_template t;
  75	struct iscsi_transport *iscsi_transport;
  76	struct list_head list;
  77	struct device dev;
  78
  79	struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
  80	struct transport_container conn_cont;
  81	struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
  82	struct transport_container session_cont;
  83	struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
  84};
  85
  86static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  87static struct workqueue_struct *iscsi_eh_timer_workq;
  88
 
  89/*
  90 * list of registered transports and lock that must
  91 * be held while accessing list. The iscsi_transport_lock must
  92 * be acquired after the rx_queue_mutex.
  93 */
  94static LIST_HEAD(iscsi_transports);
  95static DEFINE_SPINLOCK(iscsi_transport_lock);
  96
  97#define to_iscsi_internal(tmpl) \
  98	container_of(tmpl, struct iscsi_internal, t)
  99
 100#define dev_to_iscsi_internal(_dev) \
 101	container_of(_dev, struct iscsi_internal, dev)
 102
 103static void iscsi_transport_release(struct device *dev)
 104{
 105	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 106	kfree(priv);
 107}
 108
 109/*
 110 * iscsi_transport_class represents the iscsi_transports that are
 111 * registered.
 112 */
 113static struct class iscsi_transport_class = {
 114	.name = "iscsi_transport",
 115	.dev_release = iscsi_transport_release,
 116};
 117
 118static ssize_t
 119show_transport_handle(struct device *dev, struct device_attribute *attr,
 120		      char *buf)
 121{
 122	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 123	return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 124}
 125static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 126
 127#define show_transport_attr(name, format)				\
 128static ssize_t								\
 129show_transport_##name(struct device *dev, 				\
 130		      struct device_attribute *attr,char *buf)		\
 131{									\
 132	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
 133	return sprintf(buf, format"\n", priv->iscsi_transport->name);	\
 134}									\
 135static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 136
 137show_transport_attr(caps, "0x%x");
 138
 139static struct attribute *iscsi_transport_attrs[] = {
 140	&dev_attr_handle.attr,
 141	&dev_attr_caps.attr,
 142	NULL,
 143};
 144
 145static struct attribute_group iscsi_transport_group = {
 146	.attrs = iscsi_transport_attrs,
 147};
 148
 149/*
 150 * iSCSI endpoint attrs
 151 */
 152#define iscsi_dev_to_endpoint(_dev) \
 153	container_of(_dev, struct iscsi_endpoint, dev)
 154
 155#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
 156struct device_attribute dev_attr_##_prefix##_##_name =	\
 157        __ATTR(_name,_mode,_show,_store)
 158
 159static void iscsi_endpoint_release(struct device *dev)
 160{
 161	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 162	kfree(ep);
 163}
 164
 165static struct class iscsi_endpoint_class = {
 166	.name = "iscsi_endpoint",
 167	.dev_release = iscsi_endpoint_release,
 168};
 169
 170static ssize_t
 171show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 172{
 173	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 174	return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 175}
 176static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 177
 178static struct attribute *iscsi_endpoint_attrs[] = {
 179	&dev_attr_ep_handle.attr,
 180	NULL,
 181};
 182
 183static struct attribute_group iscsi_endpoint_group = {
 184	.attrs = iscsi_endpoint_attrs,
 185};
 186
 187#define ISCSI_MAX_EPID -1
 188
 189static int iscsi_match_epid(struct device *dev, void *data)
 190{
 191	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 192	uint64_t *epid = (uint64_t *) data;
 193
 194	return *epid == ep->id;
 195}
 196
 197struct iscsi_endpoint *
 198iscsi_create_endpoint(int dd_size)
 199{
 200	struct device *dev;
 201	struct iscsi_endpoint *ep;
 202	uint64_t id;
 203	int err;
 204
 205	for (id = 1; id < ISCSI_MAX_EPID; id++) {
 206		dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 207					iscsi_match_epid);
 208		if (!dev)
 209			break;
 210	}
 211	if (id == ISCSI_MAX_EPID) {
 212		printk(KERN_ERR "Too many connections. Max supported %u\n",
 213		       ISCSI_MAX_EPID - 1);
 214		return NULL;
 215	}
 216
 217	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 218	if (!ep)
 219		return NULL;
 220
 221	ep->id = id;
 222	ep->dev.class = &iscsi_endpoint_class;
 223	dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 224	err = device_register(&ep->dev);
 225        if (err)
 226                goto free_ep;
 227
 228	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 229	if (err)
 230		goto unregister_dev;
 231
 232	if (dd_size)
 233		ep->dd_data = &ep[1];
 234	return ep;
 235
 236unregister_dev:
 237	device_unregister(&ep->dev);
 238	return NULL;
 239
 240free_ep:
 241	kfree(ep);
 242	return NULL;
 243}
 244EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 245
 246void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 247{
 248	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 249	device_unregister(&ep->dev);
 250}
 251EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 252
 253struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 254{
 255	struct iscsi_endpoint *ep;
 256	struct device *dev;
 257
 258	dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 259				iscsi_match_epid);
 260	if (!dev)
 261		return NULL;
 262
 263	ep = iscsi_dev_to_endpoint(dev);
 264	/*
 265	 * we can drop this now because the interface will prevent
 266	 * removals and lookups from racing.
 267	 */
 268	put_device(dev);
 269	return ep;
 270}
 271EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 272
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 273static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 274			    struct device *cdev)
 275{
 276	struct Scsi_Host *shost = dev_to_shost(dev);
 277	struct iscsi_cls_host *ihost = shost->shost_data;
 278
 279	memset(ihost, 0, sizeof(*ihost));
 280	atomic_set(&ihost->nr_scans, 0);
 281	mutex_init(&ihost->mutex);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 282	return 0;
 283}
 284
 285static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 286			       "iscsi_host",
 287			       iscsi_setup_host,
 288			       NULL,
 289			       NULL);
 290
 291static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 292			       "iscsi_session",
 293			       NULL,
 294			       NULL,
 295			       NULL);
 296
 297static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 298			       "iscsi_connection",
 299			       NULL,
 300			       NULL,
 301			       NULL);
 302
 303static struct sock *nls;
 304static DEFINE_MUTEX(rx_queue_mutex);
 305
 306static LIST_HEAD(sesslist);
 307static DEFINE_SPINLOCK(sesslock);
 308static LIST_HEAD(connlist);
 309static DEFINE_SPINLOCK(connlock);
 310
 311static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 312{
 313	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 314	return sess->sid;
 315}
 316
 317/*
 318 * Returns the matching session to a given sid
 319 */
 320static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 321{
 322	unsigned long flags;
 323	struct iscsi_cls_session *sess;
 324
 325	spin_lock_irqsave(&sesslock, flags);
 326	list_for_each_entry(sess, &sesslist, sess_list) {
 327		if (sess->sid == sid) {
 328			spin_unlock_irqrestore(&sesslock, flags);
 329			return sess;
 330		}
 331	}
 332	spin_unlock_irqrestore(&sesslock, flags);
 333	return NULL;
 334}
 335
 336/*
 337 * Returns the matching connection to a given sid / cid tuple
 338 */
 339static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 340{
 341	unsigned long flags;
 342	struct iscsi_cls_conn *conn;
 343
 344	spin_lock_irqsave(&connlock, flags);
 345	list_for_each_entry(conn, &connlist, conn_list) {
 346		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 347			spin_unlock_irqrestore(&connlock, flags);
 348			return conn;
 349		}
 350	}
 351	spin_unlock_irqrestore(&connlock, flags);
 352	return NULL;
 353}
 354
 355/*
 356 * The following functions can be used by LLDs that allocate
 357 * their own scsi_hosts or by software iscsi LLDs
 358 */
 359static struct {
 360	int value;
 361	char *name;
 362} iscsi_session_state_names[] = {
 363	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
 364	{ ISCSI_SESSION_FAILED,		"FAILED" },
 365	{ ISCSI_SESSION_FREE,		"FREE" },
 366};
 367
 368static const char *iscsi_session_state_name(int state)
 369{
 370	int i;
 371	char *name = NULL;
 372
 373	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 374		if (iscsi_session_state_names[i].value == state) {
 375			name = iscsi_session_state_names[i].name;
 376			break;
 377		}
 378	}
 379	return name;
 380}
 381
 382int iscsi_session_chkready(struct iscsi_cls_session *session)
 383{
 384	unsigned long flags;
 385	int err;
 386
 387	spin_lock_irqsave(&session->lock, flags);
 388	switch (session->state) {
 389	case ISCSI_SESSION_LOGGED_IN:
 390		err = 0;
 391		break;
 392	case ISCSI_SESSION_FAILED:
 393		err = DID_IMM_RETRY << 16;
 394		break;
 395	case ISCSI_SESSION_FREE:
 396		err = DID_TRANSPORT_FAILFAST << 16;
 397		break;
 398	default:
 399		err = DID_NO_CONNECT << 16;
 400		break;
 401	}
 402	spin_unlock_irqrestore(&session->lock, flags);
 403	return err;
 404}
 405EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 406
 
 
 
 
 
 
 
 
 
 
 
 
 
 407static void iscsi_session_release(struct device *dev)
 408{
 409	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 410	struct Scsi_Host *shost;
 411
 412	shost = iscsi_session_to_shost(session);
 413	scsi_host_put(shost);
 414	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 415	kfree(session);
 416}
 417
 418static int iscsi_is_session_dev(const struct device *dev)
 419{
 420	return dev->release == iscsi_session_release;
 421}
 
 422
 423static int iscsi_iter_session_fn(struct device *dev, void *data)
 424{
 425	void (* fn) (struct iscsi_cls_session *) = data;
 426
 427	if (!iscsi_is_session_dev(dev))
 428		return 0;
 429	fn(iscsi_dev_to_session(dev));
 430	return 0;
 431}
 432
 433void iscsi_host_for_each_session(struct Scsi_Host *shost,
 434				 void (*fn)(struct iscsi_cls_session *))
 435{
 436	device_for_each_child(&shost->shost_gendev, fn,
 437			      iscsi_iter_session_fn);
 438}
 439EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 440
 441/**
 442 * iscsi_scan_finished - helper to report when running scans are done
 443 * @shost: scsi host
 444 * @time: scan run time
 445 *
 446 * This function can be used by drives like qla4xxx to report to the scsi
 447 * layer when the scans it kicked off at module load time are done.
 448 */
 449int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 450{
 451	struct iscsi_cls_host *ihost = shost->shost_data;
 452	/*
 453	 * qla4xxx will have kicked off some session unblocks before calling
 454	 * scsi_scan_host, so just wait for them to complete.
 455	 */
 456	return !atomic_read(&ihost->nr_scans);
 457}
 458EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 459
 460struct iscsi_scan_data {
 461	unsigned int channel;
 462	unsigned int id;
 463	unsigned int lun;
 464};
 465
 466static int iscsi_user_scan_session(struct device *dev, void *data)
 467{
 468	struct iscsi_scan_data *scan_data = data;
 469	struct iscsi_cls_session *session;
 470	struct Scsi_Host *shost;
 471	struct iscsi_cls_host *ihost;
 472	unsigned long flags;
 473	unsigned int id;
 474
 475	if (!iscsi_is_session_dev(dev))
 476		return 0;
 477
 478	session = iscsi_dev_to_session(dev);
 479
 480	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 481
 482	shost = iscsi_session_to_shost(session);
 483	ihost = shost->shost_data;
 484
 485	mutex_lock(&ihost->mutex);
 486	spin_lock_irqsave(&session->lock, flags);
 487	if (session->state != ISCSI_SESSION_LOGGED_IN) {
 488		spin_unlock_irqrestore(&session->lock, flags);
 489		goto user_scan_exit;
 490	}
 491	id = session->target_id;
 492	spin_unlock_irqrestore(&session->lock, flags);
 493
 494	if (id != ISCSI_MAX_TARGET) {
 495		if ((scan_data->channel == SCAN_WILD_CARD ||
 496		     scan_data->channel == 0) &&
 497		    (scan_data->id == SCAN_WILD_CARD ||
 498		     scan_data->id == id))
 499			scsi_scan_target(&session->dev, 0, id,
 500					 scan_data->lun, 1);
 501	}
 502
 503user_scan_exit:
 504	mutex_unlock(&ihost->mutex);
 505	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 506	return 0;
 507}
 508
 509static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 510			   uint id, uint lun)
 511{
 512	struct iscsi_scan_data scan_data;
 513
 514	scan_data.channel = channel;
 515	scan_data.id = id;
 516	scan_data.lun = lun;
 517
 518	return device_for_each_child(&shost->shost_gendev, &scan_data,
 519				     iscsi_user_scan_session);
 520}
 521
 522static void iscsi_scan_session(struct work_struct *work)
 523{
 524	struct iscsi_cls_session *session =
 525			container_of(work, struct iscsi_cls_session, scan_work);
 526	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 527	struct iscsi_cls_host *ihost = shost->shost_data;
 528	struct iscsi_scan_data scan_data;
 529
 530	scan_data.channel = 0;
 531	scan_data.id = SCAN_WILD_CARD;
 532	scan_data.lun = SCAN_WILD_CARD;
 533
 534	iscsi_user_scan_session(&session->dev, &scan_data);
 535	atomic_dec(&ihost->nr_scans);
 536}
 537
 538/**
 539 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 540 * @cmd: scsi cmd passed to scsi eh handler
 541 *
 542 * If the session is down this function will wait for the recovery
 543 * timer to fire or for the session to be logged back in. If the
 544 * recovery timer fires then FAST_IO_FAIL is returned. The caller
 545 * should pass this error value to the scsi eh.
 546 */
 547int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 548{
 549	struct iscsi_cls_session *session =
 550			starget_to_session(scsi_target(cmd->device));
 551	unsigned long flags;
 552	int ret = 0;
 553
 554	spin_lock_irqsave(&session->lock, flags);
 555	while (session->state != ISCSI_SESSION_LOGGED_IN) {
 556		if (session->state == ISCSI_SESSION_FREE) {
 557			ret = FAST_IO_FAIL;
 558			break;
 559		}
 560		spin_unlock_irqrestore(&session->lock, flags);
 561		msleep(1000);
 562		spin_lock_irqsave(&session->lock, flags);
 563	}
 564	spin_unlock_irqrestore(&session->lock, flags);
 565	return ret;
 566}
 567EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 568
 569static void session_recovery_timedout(struct work_struct *work)
 570{
 571	struct iscsi_cls_session *session =
 572		container_of(work, struct iscsi_cls_session,
 573			     recovery_work.work);
 574	unsigned long flags;
 575
 576	iscsi_cls_session_printk(KERN_INFO, session,
 577				 "session recovery timed out after %d secs\n",
 578				 session->recovery_tmo);
 579
 580	spin_lock_irqsave(&session->lock, flags);
 581	switch (session->state) {
 582	case ISCSI_SESSION_FAILED:
 583		session->state = ISCSI_SESSION_FREE;
 584		break;
 585	case ISCSI_SESSION_LOGGED_IN:
 586	case ISCSI_SESSION_FREE:
 587		/* we raced with the unblock's flush */
 588		spin_unlock_irqrestore(&session->lock, flags);
 589		return;
 590	}
 591	spin_unlock_irqrestore(&session->lock, flags);
 592
 593	if (session->transport->session_recovery_timedout)
 594		session->transport->session_recovery_timedout(session);
 595
 596	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 597	scsi_target_unblock(&session->dev);
 598	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 599}
 600
 601static void __iscsi_unblock_session(struct work_struct *work)
 602{
 603	struct iscsi_cls_session *session =
 604			container_of(work, struct iscsi_cls_session,
 605				     unblock_work);
 606	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 607	struct iscsi_cls_host *ihost = shost->shost_data;
 608	unsigned long flags;
 609
 610	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 611	/*
 612	 * The recovery and unblock work get run from the same workqueue,
 613	 * so try to cancel it if it was going to run after this unblock.
 614	 */
 615	cancel_delayed_work(&session->recovery_work);
 616	spin_lock_irqsave(&session->lock, flags);
 617	session->state = ISCSI_SESSION_LOGGED_IN;
 618	spin_unlock_irqrestore(&session->lock, flags);
 619	/* start IO */
 620	scsi_target_unblock(&session->dev);
 621	/*
 622	 * Only do kernel scanning if the driver is properly hooked into
 623	 * the async scanning code (drivers like iscsi_tcp do login and
 624	 * scanning from userspace).
 625	 */
 626	if (shost->hostt->scan_finished) {
 627		if (scsi_queue_work(shost, &session->scan_work))
 628			atomic_inc(&ihost->nr_scans);
 629	}
 630	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 631}
 632
 633/**
 634 * iscsi_unblock_session - set a session as logged in and start IO.
 635 * @session: iscsi session
 636 *
 637 * Mark a session as ready to accept IO.
 638 */
 639void iscsi_unblock_session(struct iscsi_cls_session *session)
 640{
 641	queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 642	/*
 643	 * make sure all the events have completed before tell the driver
 644	 * it is safe
 645	 */
 646	flush_workqueue(iscsi_eh_timer_workq);
 647}
 648EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 649
 650static void __iscsi_block_session(struct work_struct *work)
 651{
 652	struct iscsi_cls_session *session =
 653			container_of(work, struct iscsi_cls_session,
 654				     block_work);
 655	unsigned long flags;
 656
 657	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 658	spin_lock_irqsave(&session->lock, flags);
 659	session->state = ISCSI_SESSION_FAILED;
 660	spin_unlock_irqrestore(&session->lock, flags);
 661	scsi_target_block(&session->dev);
 662	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 663	if (session->recovery_tmo >= 0)
 664		queue_delayed_work(iscsi_eh_timer_workq,
 665				   &session->recovery_work,
 666				   session->recovery_tmo * HZ);
 667}
 668
 669void iscsi_block_session(struct iscsi_cls_session *session)
 670{
 671	queue_work(iscsi_eh_timer_workq, &session->block_work);
 672}
 673EXPORT_SYMBOL_GPL(iscsi_block_session);
 674
 675static void __iscsi_unbind_session(struct work_struct *work)
 676{
 677	struct iscsi_cls_session *session =
 678			container_of(work, struct iscsi_cls_session,
 679				     unbind_work);
 680	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 681	struct iscsi_cls_host *ihost = shost->shost_data;
 682	unsigned long flags;
 
 683
 684	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 685
 686	/* Prevent new scans and make sure scanning is not in progress */
 687	mutex_lock(&ihost->mutex);
 688	spin_lock_irqsave(&session->lock, flags);
 689	if (session->target_id == ISCSI_MAX_TARGET) {
 690		spin_unlock_irqrestore(&session->lock, flags);
 691		mutex_unlock(&ihost->mutex);
 692		return;
 693	}
 
 
 694	session->target_id = ISCSI_MAX_TARGET;
 695	spin_unlock_irqrestore(&session->lock, flags);
 696	mutex_unlock(&ihost->mutex);
 697
 
 
 
 698	scsi_remove_target(&session->dev);
 699	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 700	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
 701}
 702
 703struct iscsi_cls_session *
 704iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 705		    int dd_size)
 706{
 707	struct iscsi_cls_session *session;
 708
 709	session = kzalloc(sizeof(*session) + dd_size,
 710			  GFP_KERNEL);
 711	if (!session)
 712		return NULL;
 713
 714	session->transport = transport;
 
 715	session->recovery_tmo = 120;
 716	session->state = ISCSI_SESSION_FREE;
 717	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 718	INIT_LIST_HEAD(&session->sess_list);
 719	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 720	INIT_WORK(&session->block_work, __iscsi_block_session);
 721	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 722	INIT_WORK(&session->scan_work, iscsi_scan_session);
 723	spin_lock_init(&session->lock);
 724
 725	/* this is released in the dev's release function */
 726	scsi_host_get(shost);
 727	session->dev.parent = &shost->shost_gendev;
 728	session->dev.release = iscsi_session_release;
 729	device_initialize(&session->dev);
 730	if (dd_size)
 731		session->dd_data = &session[1];
 732
 733	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
 734	return session;
 735}
 736EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 737
 738static int iscsi_get_next_target_id(struct device *dev, void *data)
 739{
 740	struct iscsi_cls_session *session;
 741	unsigned long flags;
 742	int err = 0;
 743
 744	if (!iscsi_is_session_dev(dev))
 745		return 0;
 746
 747	session = iscsi_dev_to_session(dev);
 748	spin_lock_irqsave(&session->lock, flags);
 749	if (*((unsigned int *) data) == session->target_id)
 750		err = -EEXIST;
 751	spin_unlock_irqrestore(&session->lock, flags);
 752	return err;
 753}
 754
 755int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 756{
 757	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 758	struct iscsi_cls_host *ihost;
 759	unsigned long flags;
 760	unsigned int id = target_id;
 761	int err;
 762
 763	ihost = shost->shost_data;
 764	session->sid = atomic_add_return(1, &iscsi_session_nr);
 765
 766	if (id == ISCSI_MAX_TARGET) {
 767		for (id = 0; id < ISCSI_MAX_TARGET; id++) {
 768			err = device_for_each_child(&shost->shost_gendev, &id,
 769						    iscsi_get_next_target_id);
 770			if (!err)
 771				break;
 772		}
 773
 774		if (id == ISCSI_MAX_TARGET) {
 775			iscsi_cls_session_printk(KERN_ERR, session,
 776						 "Too many iscsi targets. Max "
 777						 "number of targets is %d.\n",
 778						 ISCSI_MAX_TARGET - 1);
 779			err = -EOVERFLOW;
 780			goto release_host;
 781		}
 782	}
 783	session->target_id = id;
 
 
 784
 785	dev_set_name(&session->dev, "session%u", session->sid);
 786	err = device_add(&session->dev);
 787	if (err) {
 788		iscsi_cls_session_printk(KERN_ERR, session,
 789					 "could not register session's dev\n");
 790		goto release_host;
 791	}
 792	transport_register_device(&session->dev);
 793
 794	spin_lock_irqsave(&sesslock, flags);
 795	list_add(&session->sess_list, &sesslist);
 796	spin_unlock_irqrestore(&sesslock, flags);
 797
 798	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 799	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
 800	return 0;
 801
 802release_host:
 803	scsi_host_put(shost);
 
 
 804	return err;
 805}
 806EXPORT_SYMBOL_GPL(iscsi_add_session);
 807
 808/**
 809 * iscsi_create_session - create iscsi class session
 810 * @shost: scsi host
 811 * @transport: iscsi transport
 812 * @dd_size: private driver data size
 813 * @target_id: which target
 814 *
 815 * This can be called from a LLD or iscsi_transport.
 816 */
 817struct iscsi_cls_session *
 818iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 819		     int dd_size, unsigned int target_id)
 820{
 821	struct iscsi_cls_session *session;
 822
 823	session = iscsi_alloc_session(shost, transport, dd_size);
 824	if (!session)
 825		return NULL;
 826
 827	if (iscsi_add_session(session, target_id)) {
 828		iscsi_free_session(session);
 829		return NULL;
 830	}
 831	return session;
 832}
 833EXPORT_SYMBOL_GPL(iscsi_create_session);
 834
 835static void iscsi_conn_release(struct device *dev)
 836{
 837	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
 838	struct device *parent = conn->dev.parent;
 839
 840	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
 841	kfree(conn);
 842	put_device(parent);
 843}
 844
 845static int iscsi_is_conn_dev(const struct device *dev)
 846{
 847	return dev->release == iscsi_conn_release;
 848}
 849
 850static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
 851{
 852	if (!iscsi_is_conn_dev(dev))
 853		return 0;
 854	return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
 855}
 856
 857void iscsi_remove_session(struct iscsi_cls_session *session)
 858{
 859	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 860	unsigned long flags;
 861	int err;
 862
 863	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
 864
 865	spin_lock_irqsave(&sesslock, flags);
 866	list_del(&session->sess_list);
 867	spin_unlock_irqrestore(&sesslock, flags);
 868
 869	/* make sure there are no blocks/unblocks queued */
 870	flush_workqueue(iscsi_eh_timer_workq);
 871	/* make sure the timedout callout is not running */
 872	if (!cancel_delayed_work(&session->recovery_work))
 873		flush_workqueue(iscsi_eh_timer_workq);
 874	/*
 875	 * If we are blocked let commands flow again. The lld or iscsi
 876	 * layer should set up the queuecommand to fail commands.
 877	 * We assume that LLD will not be calling block/unblock while
 878	 * removing the session.
 879	 */
 880	spin_lock_irqsave(&session->lock, flags);
 881	session->state = ISCSI_SESSION_FREE;
 882	spin_unlock_irqrestore(&session->lock, flags);
 883
 884	scsi_target_unblock(&session->dev);
 885	/* flush running scans then delete devices */
 886	scsi_flush_work(shost);
 887	__iscsi_unbind_session(&session->unbind_work);
 888
 889	/* hw iscsi may not have removed all connections from session */
 890	err = device_for_each_child(&session->dev, NULL,
 891				    iscsi_iter_destroy_conn_fn);
 892	if (err)
 893		iscsi_cls_session_printk(KERN_ERR, session,
 894					 "Could not delete all connections "
 895					 "for session. Error %d.\n", err);
 896
 897	transport_unregister_device(&session->dev);
 898
 899	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
 900	device_del(&session->dev);
 901}
 902EXPORT_SYMBOL_GPL(iscsi_remove_session);
 903
 904void iscsi_free_session(struct iscsi_cls_session *session)
 905{
 906	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
 907	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
 908	put_device(&session->dev);
 909}
 910EXPORT_SYMBOL_GPL(iscsi_free_session);
 911
 912/**
 913 * iscsi_destroy_session - destroy iscsi session
 914 * @session: iscsi_session
 915 *
 916 * Can be called by a LLD or iscsi_transport. There must not be
 917 * any running connections.
 918 */
 919int iscsi_destroy_session(struct iscsi_cls_session *session)
 920{
 921	iscsi_remove_session(session);
 922	ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
 923	iscsi_free_session(session);
 924	return 0;
 925}
 926EXPORT_SYMBOL_GPL(iscsi_destroy_session);
 927
 928/**
 929 * iscsi_create_conn - create iscsi class connection
 930 * @session: iscsi cls session
 931 * @dd_size: private driver data size
 932 * @cid: connection id
 933 *
 934 * This can be called from a LLD or iscsi_transport. The connection
 935 * is child of the session so cid must be unique for all connections
 936 * on the session.
 937 *
 938 * Since we do not support MCS, cid will normally be zero. In some cases
 939 * for software iscsi we could be trying to preallocate a connection struct
 940 * in which case there could be two connection structs and cid would be
 941 * non-zero.
 942 */
 943struct iscsi_cls_conn *
 944iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
 945{
 946	struct iscsi_transport *transport = session->transport;
 947	struct iscsi_cls_conn *conn;
 948	unsigned long flags;
 949	int err;
 950
 951	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
 952	if (!conn)
 953		return NULL;
 954	if (dd_size)
 955		conn->dd_data = &conn[1];
 956
 957	mutex_init(&conn->ep_mutex);
 958	INIT_LIST_HEAD(&conn->conn_list);
 959	conn->transport = transport;
 960	conn->cid = cid;
 961
 962	/* this is released in the dev's release function */
 963	if (!get_device(&session->dev))
 964		goto free_conn;
 965
 966	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
 967	conn->dev.parent = &session->dev;
 968	conn->dev.release = iscsi_conn_release;
 969	err = device_register(&conn->dev);
 970	if (err) {
 971		iscsi_cls_session_printk(KERN_ERR, session, "could not "
 972					 "register connection's dev\n");
 973		goto release_parent_ref;
 974	}
 975	transport_register_device(&conn->dev);
 976
 977	spin_lock_irqsave(&connlock, flags);
 978	list_add(&conn->conn_list, &connlist);
 979	spin_unlock_irqrestore(&connlock, flags);
 980
 981	ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
 982	return conn;
 983
 984release_parent_ref:
 985	put_device(&session->dev);
 986free_conn:
 987	kfree(conn);
 988	return NULL;
 989}
 990
 991EXPORT_SYMBOL_GPL(iscsi_create_conn);
 992
 993/**
 994 * iscsi_destroy_conn - destroy iscsi class connection
 995 * @conn: iscsi cls session
 996 *
 997 * This can be called from a LLD or iscsi_transport.
 998 */
 999int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1000{
1001	unsigned long flags;
1002
1003	spin_lock_irqsave(&connlock, flags);
1004	list_del(&conn->conn_list);
1005	spin_unlock_irqrestore(&connlock, flags);
1006
1007	transport_unregister_device(&conn->dev);
1008	ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1009	device_unregister(&conn->dev);
1010	return 0;
1011}
1012EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1013
1014/*
1015 * iscsi interface functions
1016 */
1017static struct iscsi_internal *
1018iscsi_if_transport_lookup(struct iscsi_transport *tt)
1019{
1020	struct iscsi_internal *priv;
1021	unsigned long flags;
1022
1023	spin_lock_irqsave(&iscsi_transport_lock, flags);
1024	list_for_each_entry(priv, &iscsi_transports, list) {
1025		if (tt == priv->iscsi_transport) {
1026			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1027			return priv;
1028		}
1029	}
1030	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1031	return NULL;
1032}
1033
1034static int
1035iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1036{
1037	return nlmsg_multicast(nls, skb, 0, group, gfp);
1038}
1039
1040int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1041		   char *data, uint32_t data_size)
1042{
1043	struct nlmsghdr	*nlh;
1044	struct sk_buff *skb;
1045	struct iscsi_uevent *ev;
1046	char *pdu;
1047	struct iscsi_internal *priv;
1048	int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1049			      data_size);
1050
1051	priv = iscsi_if_transport_lookup(conn->transport);
1052	if (!priv)
1053		return -EINVAL;
1054
1055	skb = alloc_skb(len, GFP_ATOMIC);
1056	if (!skb) {
1057		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1058		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1059				      "control PDU: OOM\n");
1060		return -ENOMEM;
1061	}
1062
1063	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1064	ev = NLMSG_DATA(nlh);
1065	memset(ev, 0, sizeof(*ev));
1066	ev->transport_handle = iscsi_handle(conn->transport);
1067	ev->type = ISCSI_KEVENT_RECV_PDU;
1068	ev->r.recv_req.cid = conn->cid;
1069	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1070	pdu = (char*)ev + sizeof(*ev);
1071	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1072	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1073
1074	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1075}
1076EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1077
1078int iscsi_offload_mesg(struct Scsi_Host *shost,
1079		       struct iscsi_transport *transport, uint32_t type,
1080		       char *data, uint16_t data_size)
1081{
1082	struct nlmsghdr	*nlh;
1083	struct sk_buff *skb;
1084	struct iscsi_uevent *ev;
1085	int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1086
1087	skb = alloc_skb(len, GFP_ATOMIC);
1088	if (!skb) {
1089		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1090		return -ENOMEM;
1091	}
1092
1093	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1094	ev = NLMSG_DATA(nlh);
1095	memset(ev, 0, sizeof(*ev));
1096	ev->type = type;
1097	ev->transport_handle = iscsi_handle(transport);
1098	switch (type) {
1099	case ISCSI_KEVENT_PATH_REQ:
1100		ev->r.req_path.host_no = shost->host_no;
1101		break;
1102	case ISCSI_KEVENT_IF_DOWN:
1103		ev->r.notify_if_down.host_no = shost->host_no;
1104		break;
1105	}
1106
1107	memcpy((char *)ev + sizeof(*ev), data, data_size);
1108
1109	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1110}
1111EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1112
1113void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1114{
1115	struct nlmsghdr	*nlh;
1116	struct sk_buff	*skb;
1117	struct iscsi_uevent *ev;
1118	struct iscsi_internal *priv;
1119	int len = NLMSG_SPACE(sizeof(*ev));
1120
1121	priv = iscsi_if_transport_lookup(conn->transport);
1122	if (!priv)
1123		return;
1124
1125	skb = alloc_skb(len, GFP_ATOMIC);
1126	if (!skb) {
1127		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1128				      "conn error (%d)\n", error);
1129		return;
1130	}
1131
1132	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1133	ev = NLMSG_DATA(nlh);
1134	ev->transport_handle = iscsi_handle(conn->transport);
1135	ev->type = ISCSI_KEVENT_CONN_ERROR;
1136	ev->r.connerror.error = error;
1137	ev->r.connerror.cid = conn->cid;
1138	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1139
1140	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1141
1142	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1143			      error);
1144}
1145EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1146
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1147static int
1148iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1149		    void *payload, int size)
1150{
1151	struct sk_buff	*skb;
1152	struct nlmsghdr	*nlh;
1153	int len = NLMSG_SPACE(size);
1154	int flags = multi ? NLM_F_MULTI : 0;
1155	int t = done ? NLMSG_DONE : type;
1156
1157	skb = alloc_skb(len, GFP_ATOMIC);
1158	if (!skb) {
1159		printk(KERN_ERR "Could not allocate skb to send reply.\n");
1160		return -ENOMEM;
1161	}
1162
1163	nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1164	nlh->nlmsg_flags = flags;
1165	memcpy(NLMSG_DATA(nlh), payload, size);
1166	return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1167}
1168
1169static int
1170iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1171{
1172	struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1173	struct iscsi_stats *stats;
1174	struct sk_buff *skbstat;
1175	struct iscsi_cls_conn *conn;
1176	struct nlmsghdr	*nlhstat;
1177	struct iscsi_uevent *evstat;
1178	struct iscsi_internal *priv;
1179	int len = NLMSG_SPACE(sizeof(*ev) +
1180			      sizeof(struct iscsi_stats) +
1181			      sizeof(struct iscsi_stats_custom) *
1182			      ISCSI_STATS_CUSTOM_MAX);
1183	int err = 0;
1184
1185	priv = iscsi_if_transport_lookup(transport);
1186	if (!priv)
1187		return -EINVAL;
1188
1189	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1190	if (!conn)
1191		return -EEXIST;
1192
1193	do {
1194		int actual_size;
1195
1196		skbstat = alloc_skb(len, GFP_ATOMIC);
1197		if (!skbstat) {
1198			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1199					      "deliver stats: OOM\n");
1200			return -ENOMEM;
1201		}
1202
1203		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1204				      (len - sizeof(*nlhstat)), 0);
1205		evstat = NLMSG_DATA(nlhstat);
1206		memset(evstat, 0, sizeof(*evstat));
1207		evstat->transport_handle = iscsi_handle(conn->transport);
1208		evstat->type = nlh->nlmsg_type;
1209		evstat->u.get_stats.cid =
1210			ev->u.get_stats.cid;
1211		evstat->u.get_stats.sid =
1212			ev->u.get_stats.sid;
1213		stats = (struct iscsi_stats *)
1214			((char*)evstat + sizeof(*evstat));
1215		memset(stats, 0, sizeof(*stats));
1216
1217		transport->get_stats(conn, stats);
1218		actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1219					  sizeof(struct iscsi_stats) +
1220					  sizeof(struct iscsi_stats_custom) *
1221					  stats->custom_length);
1222		actual_size -= sizeof(*nlhstat);
1223		actual_size = NLMSG_LENGTH(actual_size);
1224		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1225		nlhstat->nlmsg_len = actual_size;
1226
1227		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1228					  GFP_ATOMIC);
1229	} while (err < 0 && err != -ECONNREFUSED);
1230
1231	return err;
1232}
1233
1234/**
1235 * iscsi_session_event - send session destr. completion event
1236 * @session: iscsi class session
1237 * @event: type of event
1238 */
1239int iscsi_session_event(struct iscsi_cls_session *session,
1240			enum iscsi_uevent_e event)
1241{
1242	struct iscsi_internal *priv;
1243	struct Scsi_Host *shost;
1244	struct iscsi_uevent *ev;
1245	struct sk_buff  *skb;
1246	struct nlmsghdr *nlh;
1247	int rc, len = NLMSG_SPACE(sizeof(*ev));
1248
1249	priv = iscsi_if_transport_lookup(session->transport);
1250	if (!priv)
1251		return -EINVAL;
1252	shost = iscsi_session_to_shost(session);
1253
1254	skb = alloc_skb(len, GFP_KERNEL);
1255	if (!skb) {
1256		iscsi_cls_session_printk(KERN_ERR, session,
1257					 "Cannot notify userspace of session "
1258					 "event %u\n", event);
1259		return -ENOMEM;
1260	}
1261
1262	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1263	ev = NLMSG_DATA(nlh);
1264	ev->transport_handle = iscsi_handle(session->transport);
1265
1266	ev->type = event;
1267	switch (event) {
1268	case ISCSI_KEVENT_DESTROY_SESSION:
1269		ev->r.d_session.host_no = shost->host_no;
1270		ev->r.d_session.sid = session->sid;
1271		break;
1272	case ISCSI_KEVENT_CREATE_SESSION:
1273		ev->r.c_session_ret.host_no = shost->host_no;
1274		ev->r.c_session_ret.sid = session->sid;
1275		break;
1276	case ISCSI_KEVENT_UNBIND_SESSION:
1277		ev->r.unbind_session.host_no = shost->host_no;
1278		ev->r.unbind_session.sid = session->sid;
1279		break;
1280	default:
1281		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1282					 "%u.\n", event);
1283		kfree_skb(skb);
1284		return -EINVAL;
1285	}
1286
1287	/*
1288	 * this will occur if the daemon is not up, so we just warn
1289	 * the user and when the daemon is restarted it will handle it
1290	 */
1291	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1292	if (rc == -ESRCH)
1293		iscsi_cls_session_printk(KERN_ERR, session,
1294					 "Cannot notify userspace of session "
1295					 "event %u. Check iscsi daemon\n",
1296					 event);
1297
1298	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1299				event, rc);
1300	return rc;
1301}
1302EXPORT_SYMBOL_GPL(iscsi_session_event);
1303
1304static int
1305iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1306			struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1307			uint16_t cmds_max, uint16_t queue_depth)
 
1308{
1309	struct iscsi_transport *transport = priv->iscsi_transport;
1310	struct iscsi_cls_session *session;
1311	struct Scsi_Host *shost;
1312
1313	session = transport->create_session(ep, cmds_max, queue_depth,
1314					    initial_cmdsn);
1315	if (!session)
1316		return -ENOMEM;
1317
 
1318	shost = iscsi_session_to_shost(session);
1319	ev->r.c_session_ret.host_no = shost->host_no;
1320	ev->r.c_session_ret.sid = session->sid;
1321	ISCSI_DBG_TRANS_SESSION(session,
1322				"Completed creating transport session\n");
1323	return 0;
1324}
1325
1326static int
1327iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1328{
1329	struct iscsi_cls_conn *conn;
1330	struct iscsi_cls_session *session;
1331
1332	session = iscsi_session_lookup(ev->u.c_conn.sid);
1333	if (!session) {
1334		printk(KERN_ERR "iscsi: invalid session %d.\n",
1335		       ev->u.c_conn.sid);
1336		return -EINVAL;
1337	}
1338
1339	conn = transport->create_conn(session, ev->u.c_conn.cid);
1340	if (!conn) {
1341		iscsi_cls_session_printk(KERN_ERR, session,
1342					 "couldn't create a new connection.");
1343		return -ENOMEM;
1344	}
1345
1346	ev->r.c_conn_ret.sid = session->sid;
1347	ev->r.c_conn_ret.cid = conn->cid;
1348
1349	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1350	return 0;
1351}
1352
1353static int
1354iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1355{
1356	struct iscsi_cls_conn *conn;
1357
1358	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1359	if (!conn)
1360		return -EINVAL;
1361
1362	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1363	if (transport->destroy_conn)
1364		transport->destroy_conn(conn);
1365
1366	return 0;
1367}
1368
1369static int
1370iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1371{
1372	char *data = (char*)ev + sizeof(*ev);
1373	struct iscsi_cls_conn *conn;
1374	struct iscsi_cls_session *session;
1375	int err = 0, value = 0;
1376
1377	session = iscsi_session_lookup(ev->u.set_param.sid);
1378	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1379	if (!conn || !session)
1380		return -EINVAL;
1381
1382	switch (ev->u.set_param.param) {
1383	case ISCSI_PARAM_SESS_RECOVERY_TMO:
1384		sscanf(data, "%d", &value);
1385		session->recovery_tmo = value;
1386		break;
1387	default:
1388		err = transport->set_param(conn, ev->u.set_param.param,
1389					   data, ev->u.set_param.len);
1390	}
1391
1392	return err;
1393}
1394
1395static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1396			       struct iscsi_uevent *ev, int msg_type)
1397{
1398	struct iscsi_endpoint *ep;
1399	struct sockaddr *dst_addr;
1400	struct Scsi_Host *shost = NULL;
1401	int non_blocking, err = 0;
1402
1403	if (!transport->ep_connect)
1404		return -EINVAL;
1405
1406	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1407		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1408		if (!shost) {
1409			printk(KERN_ERR "ep connect failed. Could not find "
1410			       "host no %u\n",
1411			       ev->u.ep_connect_through_host.host_no);
1412			return -ENODEV;
1413		}
1414		non_blocking = ev->u.ep_connect_through_host.non_blocking;
1415	} else
1416		non_blocking = ev->u.ep_connect.non_blocking;
1417
1418	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1419	ep = transport->ep_connect(shost, dst_addr, non_blocking);
1420	if (IS_ERR(ep)) {
1421		err = PTR_ERR(ep);
1422		goto release_host;
1423	}
1424
1425	ev->r.ep_connect_ret.handle = ep->id;
1426release_host:
1427	if (shost)
1428		scsi_host_put(shost);
1429	return err;
1430}
1431
1432static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1433				  u64 ep_handle)
1434{
1435	struct iscsi_cls_conn *conn;
1436	struct iscsi_endpoint *ep;
1437
1438	if (!transport->ep_disconnect)
1439		return -EINVAL;
1440
1441	ep = iscsi_lookup_endpoint(ep_handle);
1442	if (!ep)
1443		return -EINVAL;
1444	conn = ep->conn;
1445	if (conn) {
1446		mutex_lock(&conn->ep_mutex);
1447		conn->ep = NULL;
1448		mutex_unlock(&conn->ep_mutex);
1449	}
1450
1451	transport->ep_disconnect(ep);
1452	return 0;
1453}
1454
1455static int
1456iscsi_if_transport_ep(struct iscsi_transport *transport,
1457		      struct iscsi_uevent *ev, int msg_type)
1458{
1459	struct iscsi_endpoint *ep;
1460	int rc = 0;
1461
1462	switch (msg_type) {
1463	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1464	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1465		rc = iscsi_if_ep_connect(transport, ev, msg_type);
1466		break;
1467	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1468		if (!transport->ep_poll)
1469			return -EINVAL;
1470
1471		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1472		if (!ep)
1473			return -EINVAL;
1474
1475		ev->r.retcode = transport->ep_poll(ep,
1476						   ev->u.ep_poll.timeout_ms);
1477		break;
1478	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1479		rc = iscsi_if_ep_disconnect(transport,
1480					    ev->u.ep_disconnect.ep_handle);
1481		break;
1482	}
1483	return rc;
1484}
1485
1486static int
1487iscsi_tgt_dscvr(struct iscsi_transport *transport,
1488		struct iscsi_uevent *ev)
1489{
1490	struct Scsi_Host *shost;
1491	struct sockaddr *dst_addr;
1492	int err;
1493
1494	if (!transport->tgt_dscvr)
1495		return -EINVAL;
1496
1497	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1498	if (!shost) {
1499		printk(KERN_ERR "target discovery could not find host no %u\n",
1500		       ev->u.tgt_dscvr.host_no);
1501		return -ENODEV;
1502	}
1503
1504
1505	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1506	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1507				   ev->u.tgt_dscvr.enable, dst_addr);
1508	scsi_host_put(shost);
1509	return err;
1510}
1511
1512static int
1513iscsi_set_host_param(struct iscsi_transport *transport,
1514		     struct iscsi_uevent *ev)
1515{
1516	char *data = (char*)ev + sizeof(*ev);
1517	struct Scsi_Host *shost;
1518	int err;
1519
1520	if (!transport->set_host_param)
1521		return -ENOSYS;
1522
1523	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1524	if (!shost) {
1525		printk(KERN_ERR "set_host_param could not find host no %u\n",
1526		       ev->u.set_host_param.host_no);
1527		return -ENODEV;
1528	}
1529
1530	err = transport->set_host_param(shost, ev->u.set_host_param.param,
1531					data, ev->u.set_host_param.len);
1532	scsi_host_put(shost);
1533	return err;
1534}
1535
1536static int
1537iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1538{
1539	struct Scsi_Host *shost;
1540	struct iscsi_path *params;
1541	int err;
1542
1543	if (!transport->set_path)
1544		return -ENOSYS;
1545
1546	shost = scsi_host_lookup(ev->u.set_path.host_no);
1547	if (!shost) {
1548		printk(KERN_ERR "set path could not find host no %u\n",
1549		       ev->u.set_path.host_no);
1550		return -ENODEV;
1551	}
1552
1553	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1554	err = transport->set_path(shost, params);
1555
1556	scsi_host_put(shost);
1557	return err;
1558}
1559
1560static int
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1561iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1562{
1563	int err = 0;
1564	struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1565	struct iscsi_transport *transport = NULL;
1566	struct iscsi_internal *priv;
1567	struct iscsi_cls_session *session;
1568	struct iscsi_cls_conn *conn;
1569	struct iscsi_endpoint *ep = NULL;
1570
1571	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1572		*group = ISCSI_NL_GRP_UIP;
1573	else
1574		*group = ISCSI_NL_GRP_ISCSID;
1575
1576	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1577	if (!priv)
1578		return -EINVAL;
1579	transport = priv->iscsi_transport;
1580
1581	if (!try_module_get(transport->owner))
1582		return -EINVAL;
1583
1584	switch (nlh->nlmsg_type) {
1585	case ISCSI_UEVENT_CREATE_SESSION:
1586		err = iscsi_if_create_session(priv, ep, ev,
 
1587					      ev->u.c_session.initial_cmdsn,
1588					      ev->u.c_session.cmds_max,
1589					      ev->u.c_session.queue_depth);
1590		break;
1591	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1592		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1593		if (!ep) {
1594			err = -EINVAL;
1595			break;
1596		}
1597
1598		err = iscsi_if_create_session(priv, ep, ev,
 
1599					ev->u.c_bound_session.initial_cmdsn,
1600					ev->u.c_bound_session.cmds_max,
1601					ev->u.c_bound_session.queue_depth);
1602		break;
1603	case ISCSI_UEVENT_DESTROY_SESSION:
1604		session = iscsi_session_lookup(ev->u.d_session.sid);
1605		if (session)
1606			transport->destroy_session(session);
1607		else
1608			err = -EINVAL;
1609		break;
1610	case ISCSI_UEVENT_UNBIND_SESSION:
1611		session = iscsi_session_lookup(ev->u.d_session.sid);
1612		if (session)
1613			scsi_queue_work(iscsi_session_to_shost(session),
1614					&session->unbind_work);
1615		else
1616			err = -EINVAL;
1617		break;
1618	case ISCSI_UEVENT_CREATE_CONN:
1619		err = iscsi_if_create_conn(transport, ev);
1620		break;
1621	case ISCSI_UEVENT_DESTROY_CONN:
1622		err = iscsi_if_destroy_conn(transport, ev);
1623		break;
1624	case ISCSI_UEVENT_BIND_CONN:
1625		session = iscsi_session_lookup(ev->u.b_conn.sid);
1626		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1627
1628		if (conn && conn->ep)
1629			iscsi_if_ep_disconnect(transport, conn->ep->id);
1630
1631		if (!session || !conn) {
1632			err = -EINVAL;
1633			break;
1634		}
1635
1636		ev->r.retcode =	transport->bind_conn(session, conn,
1637						ev->u.b_conn.transport_eph,
1638						ev->u.b_conn.is_leading);
1639		if (ev->r.retcode || !transport->ep_connect)
1640			break;
1641
1642		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1643		if (ep) {
1644			ep->conn = conn;
1645
1646			mutex_lock(&conn->ep_mutex);
1647			conn->ep = ep;
1648			mutex_unlock(&conn->ep_mutex);
1649		} else
1650			iscsi_cls_conn_printk(KERN_ERR, conn,
1651					      "Could not set ep conn "
1652					      "binding\n");
1653		break;
1654	case ISCSI_UEVENT_SET_PARAM:
1655		err = iscsi_set_param(transport, ev);
1656		break;
1657	case ISCSI_UEVENT_START_CONN:
1658		conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1659		if (conn)
1660			ev->r.retcode = transport->start_conn(conn);
1661		else
1662			err = -EINVAL;
1663		break;
1664	case ISCSI_UEVENT_STOP_CONN:
1665		conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1666		if (conn)
1667			transport->stop_conn(conn, ev->u.stop_conn.flag);
1668		else
1669			err = -EINVAL;
1670		break;
1671	case ISCSI_UEVENT_SEND_PDU:
1672		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1673		if (conn)
1674			ev->r.retcode =	transport->send_pdu(conn,
1675				(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1676				(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1677				ev->u.send_pdu.data_size);
1678		else
1679			err = -EINVAL;
1680		break;
1681	case ISCSI_UEVENT_GET_STATS:
1682		err = iscsi_if_get_stats(transport, nlh);
1683		break;
1684	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1685	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1686	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1687	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1688		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1689		break;
1690	case ISCSI_UEVENT_TGT_DSCVR:
1691		err = iscsi_tgt_dscvr(transport, ev);
1692		break;
1693	case ISCSI_UEVENT_SET_HOST_PARAM:
1694		err = iscsi_set_host_param(transport, ev);
1695		break;
1696	case ISCSI_UEVENT_PATH_UPDATE:
1697		err = iscsi_set_path(transport, ev);
1698		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1699	default:
1700		err = -ENOSYS;
1701		break;
1702	}
1703
1704	module_put(transport->owner);
1705	return err;
1706}
1707
1708/*
1709 * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1710 * Malformed skbs with wrong lengths or invalid creds are not processed.
1711 */
1712static void
1713iscsi_if_rx(struct sk_buff *skb)
1714{
1715	mutex_lock(&rx_queue_mutex);
1716	while (skb->len >= NLMSG_SPACE(0)) {
1717		int err;
1718		uint32_t rlen;
1719		struct nlmsghdr	*nlh;
1720		struct iscsi_uevent *ev;
1721		uint32_t group;
1722
1723		nlh = nlmsg_hdr(skb);
1724		if (nlh->nlmsg_len < sizeof(*nlh) ||
1725		    skb->len < nlh->nlmsg_len) {
1726			break;
1727		}
1728
1729		ev = NLMSG_DATA(nlh);
1730		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1731		if (rlen > skb->len)
1732			rlen = skb->len;
1733
1734		err = iscsi_if_recv_msg(skb, nlh, &group);
1735		if (err) {
1736			ev->type = ISCSI_KEVENT_IF_ERROR;
1737			ev->iferror = err;
1738		}
1739		do {
1740			/*
1741			 * special case for GET_STATS:
1742			 * on success - sending reply and stats from
1743			 * inside of if_recv_msg(),
1744			 * on error - fall through.
1745			 */
1746			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1747				break;
 
 
1748			err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1749				nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1750		} while (err < 0 && err != -ECONNREFUSED);
1751		skb_pull(skb, rlen);
1752	}
1753	mutex_unlock(&rx_queue_mutex);
1754}
1755
1756#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
1757struct device_attribute dev_attr_##_prefix##_##_name =	\
1758	__ATTR(_name,_mode,_show,_store)
1759
1760/*
1761 * iSCSI connection attrs
1762 */
1763#define iscsi_conn_attr_show(param)					\
1764static ssize_t								\
1765show_conn_param_##param(struct device *dev, 				\
1766			struct device_attribute *attr, char *buf)	\
1767{									\
1768	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
1769	struct iscsi_transport *t = conn->transport;			\
1770	return t->get_conn_param(conn, param, buf);			\
1771}
1772
1773#define iscsi_conn_attr(field, param)					\
1774	iscsi_conn_attr_show(param)					\
1775static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
1776			NULL);
1777
1778iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1779iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1780iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1781iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1782iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1783iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1784iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1785iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1786iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1787iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1788iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1789
1790#define iscsi_conn_ep_attr_show(param)					\
1791static ssize_t show_conn_ep_param_##param(struct device *dev,		\
1792					  struct device_attribute *attr,\
1793					  char *buf)			\
1794{									\
1795	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
1796	struct iscsi_transport *t = conn->transport;			\
1797	struct iscsi_endpoint *ep;					\
1798	ssize_t rc;							\
1799									\
1800	/*								\
1801	 * Need to make sure ep_disconnect does not free the LLD's	\
1802	 * interconnect resources while we are trying to read them.	\
1803	 */								\
1804	mutex_lock(&conn->ep_mutex);					\
1805	ep = conn->ep;							\
1806	if (!ep && t->ep_connect) {					\
1807		mutex_unlock(&conn->ep_mutex);				\
1808		return -ENOTCONN;					\
1809	}								\
1810									\
1811	if (ep)								\
1812		rc = t->get_ep_param(ep, param, buf);			\
1813	else								\
1814		rc = t->get_conn_param(conn, param, buf);		\
1815	mutex_unlock(&conn->ep_mutex);					\
1816	return rc;							\
1817}
1818
1819#define iscsi_conn_ep_attr(field, param)				\
1820	iscsi_conn_ep_attr_show(param)					\
1821static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
1822			show_conn_ep_param_##param, NULL);
1823
1824iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1825iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
1826
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1827/*
1828 * iSCSI session attrs
1829 */
1830#define iscsi_session_attr_show(param, perm)				\
1831static ssize_t								\
1832show_session_param_##param(struct device *dev,				\
1833			   struct device_attribute *attr, char *buf)	\
1834{									\
1835	struct iscsi_cls_session *session = 				\
1836		iscsi_dev_to_session(dev->parent);			\
1837	struct iscsi_transport *t = session->transport;			\
1838									\
1839	if (perm && !capable(CAP_SYS_ADMIN))				\
1840		return -EACCES;						\
1841	return t->get_session_param(session, param, buf);		\
1842}
1843
1844#define iscsi_session_attr(field, param, perm)				\
1845	iscsi_session_attr_show(param, perm)				\
1846static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1847			NULL);
1848
1849iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1850iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1851iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1852iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1853iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1854iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1855iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1856iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1857iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1858iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1859iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1860iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1861iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1862iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
 
 
1863iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1864iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1865iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1866iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
1867iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1868iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
1869iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1870
1871static ssize_t
1872show_priv_session_state(struct device *dev, struct device_attribute *attr,
1873			char *buf)
1874{
1875	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1876	return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1877}
1878static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1879			NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1880
1881#define iscsi_priv_session_attr_show(field, format)			\
1882static ssize_t								\
1883show_priv_session_##field(struct device *dev, 				\
1884			  struct device_attribute *attr, char *buf)	\
1885{									\
1886	struct iscsi_cls_session *session = 				\
1887			iscsi_dev_to_session(dev->parent);		\
1888	if (session->field == -1)					\
1889		return sprintf(buf, "off\n");				\
1890	return sprintf(buf, format"\n", session->field);		\
1891}
1892
1893#define iscsi_priv_session_attr_store(field)				\
1894static ssize_t								\
1895store_priv_session_##field(struct device *dev,				\
1896			   struct device_attribute *attr,		\
1897			   const char *buf, size_t count)		\
1898{									\
1899	int val;							\
1900	char *cp;							\
1901	struct iscsi_cls_session *session =				\
1902		iscsi_dev_to_session(dev->parent);			\
1903	if ((session->state == ISCSI_SESSION_FREE) ||			\
1904	    (session->state == ISCSI_SESSION_FAILED))			\
1905		return -EBUSY;						\
1906	if (strncmp(buf, "off", 3) == 0)				\
1907		session->field = -1;					\
1908	else {								\
1909		val = simple_strtoul(buf, &cp, 0);			\
1910		if (*cp != '\0' && *cp != '\n')				\
1911			return -EINVAL;					\
1912		session->field = val;					\
1913	}								\
1914	return count;							\
1915}
1916
1917#define iscsi_priv_session_rw_attr(field, format)			\
1918	iscsi_priv_session_attr_show(field, format)			\
1919	iscsi_priv_session_attr_store(field)				\
1920static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
1921			show_priv_session_##field,			\
1922			store_priv_session_##field)
1923iscsi_priv_session_rw_attr(recovery_tmo, "%d");
1924
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1925/*
1926 * iSCSI host attrs
1927 */
1928#define iscsi_host_attr_show(param)					\
1929static ssize_t								\
1930show_host_param_##param(struct device *dev, 				\
1931			struct device_attribute *attr, char *buf)	\
1932{									\
1933	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
1934	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1935	return priv->iscsi_transport->get_host_param(shost, param, buf); \
1936}
1937
1938#define iscsi_host_attr(field, param)					\
1939	iscsi_host_attr_show(param)					\
1940static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
1941			NULL);
1942
1943iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1944iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1945iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1946iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
 
 
1947
1948#define SETUP_PRIV_SESSION_RD_ATTR(field)				\
1949do {									\
1950	priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1951	count++;							\
1952} while (0)
1953
1954#define SETUP_PRIV_SESSION_RW_ATTR(field)				\
1955do {									\
1956	priv->session_attrs[count] = &dev_attr_priv_sess_##field;	\
1957	count++;							\
1958} while (0)
1959
1960#define SETUP_SESSION_RD_ATTR(field, param_flag)			\
1961do {									\
1962	if (tt->param_mask & param_flag) {				\
1963		priv->session_attrs[count] = &dev_attr_sess_##field; \
1964		count++;						\
1965	}								\
1966} while (0)
1967
1968#define SETUP_CONN_RD_ATTR(field, param_flag)				\
1969do {									\
1970	if (tt->param_mask & param_flag) {				\
1971		priv->conn_attrs[count] = &dev_attr_conn_##field; \
1972		count++;						\
1973	}								\
1974} while (0)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1975
1976#define SETUP_HOST_RD_ATTR(field, param_flag)				\
1977do {									\
1978	if (tt->host_param_mask & param_flag) {				\
1979		priv->host_attrs[count] = &dev_attr_host_##field; \
1980		count++;						\
1981	}								\
1982} while (0)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1983
1984static int iscsi_session_match(struct attribute_container *cont,
1985			   struct device *dev)
1986{
1987	struct iscsi_cls_session *session;
1988	struct Scsi_Host *shost;
1989	struct iscsi_internal *priv;
1990
1991	if (!iscsi_is_session_dev(dev))
1992		return 0;
1993
1994	session = iscsi_dev_to_session(dev);
1995	shost = iscsi_session_to_shost(session);
1996	if (!shost->transportt)
1997		return 0;
1998
1999	priv = to_iscsi_internal(shost->transportt);
2000	if (priv->session_cont.ac.class != &iscsi_session_class.class)
2001		return 0;
2002
2003	return &priv->session_cont.ac == cont;
2004}
2005
2006static int iscsi_conn_match(struct attribute_container *cont,
2007			   struct device *dev)
2008{
2009	struct iscsi_cls_session *session;
2010	struct iscsi_cls_conn *conn;
2011	struct Scsi_Host *shost;
2012	struct iscsi_internal *priv;
2013
2014	if (!iscsi_is_conn_dev(dev))
2015		return 0;
2016
2017	conn = iscsi_dev_to_conn(dev);
2018	session = iscsi_dev_to_session(conn->dev.parent);
2019	shost = iscsi_session_to_shost(session);
2020
2021	if (!shost->transportt)
2022		return 0;
2023
2024	priv = to_iscsi_internal(shost->transportt);
2025	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2026		return 0;
2027
2028	return &priv->conn_cont.ac == cont;
2029}
2030
2031static int iscsi_host_match(struct attribute_container *cont,
2032			    struct device *dev)
2033{
2034	struct Scsi_Host *shost;
2035	struct iscsi_internal *priv;
2036
2037	if (!scsi_is_host_device(dev))
2038		return 0;
2039
2040	shost = dev_to_shost(dev);
2041	if (!shost->transportt  ||
2042	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2043		return 0;
2044
2045        priv = to_iscsi_internal(shost->transportt);
2046        return &priv->t.host_attrs.ac == cont;
2047}
2048
2049struct scsi_transport_template *
2050iscsi_register_transport(struct iscsi_transport *tt)
2051{
2052	struct iscsi_internal *priv;
2053	unsigned long flags;
2054	int count = 0, err;
2055
2056	BUG_ON(!tt);
2057
2058	priv = iscsi_if_transport_lookup(tt);
2059	if (priv)
2060		return NULL;
2061
2062	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2063	if (!priv)
2064		return NULL;
2065	INIT_LIST_HEAD(&priv->list);
2066	priv->iscsi_transport = tt;
2067	priv->t.user_scan = iscsi_user_scan;
2068	priv->t.create_work_queue = 1;
2069
2070	priv->dev.class = &iscsi_transport_class;
2071	dev_set_name(&priv->dev, "%s", tt->name);
2072	err = device_register(&priv->dev);
2073	if (err)
2074		goto free_priv;
2075
2076	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2077	if (err)
2078		goto unregister_dev;
2079
2080	/* host parameters */
2081	priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2082	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2083	priv->t.host_attrs.ac.match = iscsi_host_match;
 
2084	priv->t.host_size = sizeof(struct iscsi_cls_host);
2085	transport_container_register(&priv->t.host_attrs);
2086
2087	SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
2088	SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
2089	SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
2090	SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
2091	BUG_ON(count > ISCSI_HOST_ATTRS);
2092	priv->host_attrs[count] = NULL;
2093	count = 0;
2094
2095	/* connection parameters */
2096	priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
2097	priv->conn_cont.ac.class = &iscsi_connection_class.class;
2098	priv->conn_cont.ac.match = iscsi_conn_match;
 
2099	transport_container_register(&priv->conn_cont);
2100
2101	SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
2102	SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
2103	SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
2104	SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
2105	SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
2106	SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
2107	SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
2108	SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
2109	SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
2110	SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
2111	SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
2112	SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
2113	SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
2114
2115	BUG_ON(count > ISCSI_CONN_ATTRS);
2116	priv->conn_attrs[count] = NULL;
2117	count = 0;
2118
2119	/* session parameters */
2120	priv->session_cont.ac.attrs = &priv->session_attrs[0];
2121	priv->session_cont.ac.class = &iscsi_session_class.class;
2122	priv->session_cont.ac.match = iscsi_session_match;
 
2123	transport_container_register(&priv->session_cont);
2124
2125	SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2126	SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2127	SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2128	SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2129	SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2130	SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2131	SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2132	SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
2133	SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2134	SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
2135	SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2136	SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2137	SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2138	SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2139	SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2140	SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2141	SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2142	SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2143	SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2144	SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2145	SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
2146	SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
2147	SETUP_PRIV_SESSION_RD_ATTR(state);
2148
2149	BUG_ON(count > ISCSI_SESSION_ATTRS);
2150	priv->session_attrs[count] = NULL;
2151
2152	spin_lock_irqsave(&iscsi_transport_lock, flags);
2153	list_add(&priv->list, &iscsi_transports);
2154	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2155
2156	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2157	return &priv->t;
2158
2159unregister_dev:
2160	device_unregister(&priv->dev);
2161	return NULL;
2162free_priv:
2163	kfree(priv);
2164	return NULL;
2165}
2166EXPORT_SYMBOL_GPL(iscsi_register_transport);
2167
2168int iscsi_unregister_transport(struct iscsi_transport *tt)
2169{
2170	struct iscsi_internal *priv;
2171	unsigned long flags;
2172
2173	BUG_ON(!tt);
2174
2175	mutex_lock(&rx_queue_mutex);
2176
2177	priv = iscsi_if_transport_lookup(tt);
2178	BUG_ON (!priv);
2179
2180	spin_lock_irqsave(&iscsi_transport_lock, flags);
2181	list_del(&priv->list);
2182	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2183
2184	transport_container_unregister(&priv->conn_cont);
2185	transport_container_unregister(&priv->session_cont);
2186	transport_container_unregister(&priv->t.host_attrs);
2187
2188	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2189	device_unregister(&priv->dev);
2190	mutex_unlock(&rx_queue_mutex);
2191
2192	return 0;
2193}
2194EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2195
2196static __init int iscsi_transport_init(void)
2197{
2198	int err;
2199
 
 
 
2200	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2201		ISCSI_TRANSPORT_VERSION);
2202
2203	atomic_set(&iscsi_session_nr, 0);
2204
2205	err = class_register(&iscsi_transport_class);
2206	if (err)
2207		return err;
2208
2209	err = class_register(&iscsi_endpoint_class);
2210	if (err)
2211		goto unregister_transport_class;
2212
2213	err = transport_class_register(&iscsi_host_class);
2214	if (err)
2215		goto unregister_endpoint_class;
2216
 
 
 
 
2217	err = transport_class_register(&iscsi_connection_class);
2218	if (err)
2219		goto unregister_host_class;
2220
2221	err = transport_class_register(&iscsi_session_class);
2222	if (err)
2223		goto unregister_conn_class;
2224
2225	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2226				    NULL, THIS_MODULE);
 
 
 
2227	if (!nls) {
2228		err = -ENOBUFS;
2229		goto unregister_session_class;
2230	}
2231
2232	iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2233	if (!iscsi_eh_timer_workq)
 
2234		goto release_nls;
 
2235
2236	return 0;
2237
2238release_nls:
2239	netlink_kernel_release(nls);
 
 
2240unregister_session_class:
2241	transport_class_unregister(&iscsi_session_class);
2242unregister_conn_class:
2243	transport_class_unregister(&iscsi_connection_class);
2244unregister_host_class:
2245	transport_class_unregister(&iscsi_host_class);
 
 
2246unregister_endpoint_class:
2247	class_unregister(&iscsi_endpoint_class);
2248unregister_transport_class:
2249	class_unregister(&iscsi_transport_class);
2250	return err;
2251}
2252
2253static void __exit iscsi_transport_exit(void)
2254{
2255	destroy_workqueue(iscsi_eh_timer_workq);
2256	netlink_kernel_release(nls);
 
2257	transport_class_unregister(&iscsi_connection_class);
2258	transport_class_unregister(&iscsi_session_class);
2259	transport_class_unregister(&iscsi_host_class);
2260	class_unregister(&iscsi_endpoint_class);
 
2261	class_unregister(&iscsi_transport_class);
2262}
2263
2264module_init(iscsi_transport_init);
2265module_exit(iscsi_transport_exit);
2266
2267MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2268	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2269	      "Alex Aizman <itn780@yahoo.com>");
2270MODULE_DESCRIPTION("iSCSI Transport Interface");
2271MODULE_LICENSE("GPL");
2272MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2273MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);