2 * iSCSI transport class definitions
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
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.
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.
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.
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <linux/slab.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>
35 #define ISCSI_TRANSPORT_VERSION "2.0-870"
37 static int dbg_session;
38 module_param_named(debug_session, dbg_session, int,
40 MODULE_PARM_DESC(debug_session,
41 "Turn on debugging for sessions in scsi_transport_iscsi "
42 "module. Set to 1 to turn on, and zero to turn off. Default "
46 module_param_named(debug_conn, dbg_conn, int,
48 MODULE_PARM_DESC(debug_conn,
49 "Turn on debugging for connections in scsi_transport_iscsi "
50 "module. Set to 1 to turn on, and zero to turn off. Default "
53 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
56 iscsi_cls_session_printk(KERN_INFO, _session, \
61 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
64 iscsi_cls_conn_printk(KERN_INFO, _conn, \
69 struct iscsi_internal {
70 struct scsi_transport_template t;
71 struct iscsi_transport *iscsi_transport;
72 struct list_head list;
75 struct transport_container conn_cont;
76 struct transport_container session_cont;
79 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
80 static struct workqueue_struct *iscsi_eh_timer_workq;
83 * list of registered transports and lock that must
84 * be held while accessing list. The iscsi_transport_lock must
85 * be acquired after the rx_queue_mutex.
87 static LIST_HEAD(iscsi_transports);
88 static DEFINE_SPINLOCK(iscsi_transport_lock);
90 #define to_iscsi_internal(tmpl) \
91 container_of(tmpl, struct iscsi_internal, t)
93 #define dev_to_iscsi_internal(_dev) \
94 container_of(_dev, struct iscsi_internal, dev)
96 static void iscsi_transport_release(struct device *dev)
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
103 * iscsi_transport_class represents the iscsi_transports that are
106 static struct class iscsi_transport_class = {
107 .name = "iscsi_transport",
108 .dev_release = iscsi_transport_release,
112 show_transport_handle(struct device *dev, struct device_attribute *attr,
115 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
116 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
118 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
120 #define show_transport_attr(name, format) \
122 show_transport_##name(struct device *dev, \
123 struct device_attribute *attr,char *buf) \
125 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
126 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
128 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
130 show_transport_attr(caps, "0x%x");
132 static struct attribute *iscsi_transport_attrs[] = {
133 &dev_attr_handle.attr,
138 static struct attribute_group iscsi_transport_group = {
139 .attrs = iscsi_transport_attrs,
143 * iSCSI endpoint attrs
145 #define iscsi_dev_to_endpoint(_dev) \
146 container_of(_dev, struct iscsi_endpoint, dev)
148 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
149 struct device_attribute dev_attr_##_prefix##_##_name = \
150 __ATTR(_name,_mode,_show,_store)
152 static void iscsi_endpoint_release(struct device *dev)
154 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
158 static struct class iscsi_endpoint_class = {
159 .name = "iscsi_endpoint",
160 .dev_release = iscsi_endpoint_release,
164 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
166 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
167 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
169 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
171 static struct attribute *iscsi_endpoint_attrs[] = {
172 &dev_attr_ep_handle.attr,
176 static struct attribute_group iscsi_endpoint_group = {
177 .attrs = iscsi_endpoint_attrs,
180 #define ISCSI_MAX_EPID -1
182 static int iscsi_match_epid(struct device *dev, void *data)
184 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
185 uint64_t *epid = (uint64_t *) data;
187 return *epid == ep->id;
190 struct iscsi_endpoint *
191 iscsi_create_endpoint(int dd_size)
194 struct iscsi_endpoint *ep;
198 for (id = 1; id < ISCSI_MAX_EPID; id++) {
199 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
204 if (id == ISCSI_MAX_EPID) {
205 printk(KERN_ERR "Too many connections. Max supported %u\n",
210 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
215 ep->dev.class = &iscsi_endpoint_class;
216 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
217 err = device_register(&ep->dev);
221 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
226 ep->dd_data = &ep[1];
230 device_unregister(&ep->dev);
237 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
239 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
241 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
242 device_unregister(&ep->dev);
244 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
246 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
248 struct iscsi_endpoint *ep;
251 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
256 ep = iscsi_dev_to_endpoint(dev);
258 * we can drop this now because the interface will prevent
259 * removals and lookups from racing.
264 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
267 * Interface to display network param to sysfs
270 static void iscsi_iface_release(struct device *dev)
272 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
273 struct device *parent = iface->dev.parent;
280 static struct class iscsi_iface_class = {
281 .name = "iscsi_iface",
282 .dev_release = iscsi_iface_release,
285 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
286 struct device_attribute dev_attr_##_prefix##_##_name = \
287 __ATTR(_name, _mode, _show, _store)
289 /* iface attrs show */
290 #define iscsi_iface_attr_show(type, name, param_type, param) \
292 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
295 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
296 struct iscsi_transport *t = iface->transport; \
297 return t->get_iface_param(iface, param_type, param, buf); \
300 #define iscsi_iface_net_attr(type, name, param) \
301 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
302 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
304 /* generic read only ipvi4 attribute */
305 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
306 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
307 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
308 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
310 /* generic read only ipv6 attribute */
311 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
312 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
313 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
314 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
315 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
316 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
317 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
319 /* common read only iface attribute */
320 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
321 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
323 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
324 struct attribute *attr, int i)
326 struct device *dev = container_of(kobj, struct device, kobj);
327 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
328 struct iscsi_transport *t = iface->transport;
331 if (attr == &dev_attr_iface_enabled.attr)
332 param = ISCSI_NET_PARAM_IFACE_ENABLE;
333 else if (attr == &dev_attr_iface_vlan.attr)
334 param = ISCSI_NET_PARAM_VLAN_ID;
335 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
336 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
337 param = ISCSI_NET_PARAM_IPV4_ADDR;
338 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
339 param = ISCSI_NET_PARAM_IPV4_GW;
340 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
341 param = ISCSI_NET_PARAM_IPV4_SUBNET;
342 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
343 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
346 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
347 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
348 param = ISCSI_NET_PARAM_IPV6_ADDR;
349 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
350 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
351 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
352 param = ISCSI_NET_PARAM_IPV6_ROUTER;
353 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
354 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
355 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
356 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
360 WARN_ONCE(1, "Invalid iface attr");
364 return t->attr_is_visible(ISCSI_NET_PARAM, param);
367 static struct attribute *iscsi_iface_attrs[] = {
368 &dev_attr_iface_enabled.attr,
369 &dev_attr_iface_vlan.attr,
370 &dev_attr_ipv4_iface_ipaddress.attr,
371 &dev_attr_ipv4_iface_gateway.attr,
372 &dev_attr_ipv4_iface_subnet.attr,
373 &dev_attr_ipv4_iface_bootproto.attr,
374 &dev_attr_ipv6_iface_ipaddress.attr,
375 &dev_attr_ipv6_iface_link_local_addr.attr,
376 &dev_attr_ipv6_iface_router_addr.attr,
377 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
378 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
382 static struct attribute_group iscsi_iface_group = {
383 .attrs = iscsi_iface_attrs,
384 .is_visible = iscsi_iface_attr_is_visible,
388 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
389 uint32_t iface_type, uint32_t iface_num, int dd_size)
391 struct iscsi_iface *iface;
394 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
398 iface->transport = transport;
399 iface->iface_type = iface_type;
400 iface->iface_num = iface_num;
401 iface->dev.release = iscsi_iface_release;
402 iface->dev.class = &iscsi_iface_class;
403 /* parent reference released in iscsi_iface_release */
404 iface->dev.parent = get_device(&shost->shost_gendev);
405 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
406 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
409 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
412 err = device_register(&iface->dev);
416 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
421 iface->dd_data = &iface[1];
425 device_unregister(&iface->dev);
429 put_device(iface->dev.parent);
433 EXPORT_SYMBOL_GPL(iscsi_create_iface);
435 void iscsi_destroy_iface(struct iscsi_iface *iface)
437 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
438 device_unregister(&iface->dev);
440 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
442 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
445 struct Scsi_Host *shost = dev_to_shost(dev);
446 struct iscsi_cls_host *ihost = shost->shost_data;
448 memset(ihost, 0, sizeof(*ihost));
449 atomic_set(&ihost->nr_scans, 0);
450 mutex_init(&ihost->mutex);
454 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
460 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
466 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
472 static struct sock *nls;
473 static DEFINE_MUTEX(rx_queue_mutex);
475 static LIST_HEAD(sesslist);
476 static DEFINE_SPINLOCK(sesslock);
477 static LIST_HEAD(connlist);
478 static DEFINE_SPINLOCK(connlock);
480 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
482 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
487 * Returns the matching session to a given sid
489 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
492 struct iscsi_cls_session *sess;
494 spin_lock_irqsave(&sesslock, flags);
495 list_for_each_entry(sess, &sesslist, sess_list) {
496 if (sess->sid == sid) {
497 spin_unlock_irqrestore(&sesslock, flags);
501 spin_unlock_irqrestore(&sesslock, flags);
506 * Returns the matching connection to a given sid / cid tuple
508 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
511 struct iscsi_cls_conn *conn;
513 spin_lock_irqsave(&connlock, flags);
514 list_for_each_entry(conn, &connlist, conn_list) {
515 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
516 spin_unlock_irqrestore(&connlock, flags);
520 spin_unlock_irqrestore(&connlock, flags);
525 * The following functions can be used by LLDs that allocate
526 * their own scsi_hosts or by software iscsi LLDs
531 } iscsi_session_state_names[] = {
532 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
533 { ISCSI_SESSION_FAILED, "FAILED" },
534 { ISCSI_SESSION_FREE, "FREE" },
537 static const char *iscsi_session_state_name(int state)
542 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
543 if (iscsi_session_state_names[i].value == state) {
544 name = iscsi_session_state_names[i].name;
551 int iscsi_session_chkready(struct iscsi_cls_session *session)
556 spin_lock_irqsave(&session->lock, flags);
557 switch (session->state) {
558 case ISCSI_SESSION_LOGGED_IN:
561 case ISCSI_SESSION_FAILED:
562 err = DID_IMM_RETRY << 16;
564 case ISCSI_SESSION_FREE:
565 err = DID_TRANSPORT_FAILFAST << 16;
568 err = DID_NO_CONNECT << 16;
571 spin_unlock_irqrestore(&session->lock, flags);
574 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
576 static void iscsi_session_release(struct device *dev)
578 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
579 struct Scsi_Host *shost;
581 shost = iscsi_session_to_shost(session);
582 scsi_host_put(shost);
583 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
587 static int iscsi_is_session_dev(const struct device *dev)
589 return dev->release == iscsi_session_release;
592 static int iscsi_iter_session_fn(struct device *dev, void *data)
594 void (* fn) (struct iscsi_cls_session *) = data;
596 if (!iscsi_is_session_dev(dev))
598 fn(iscsi_dev_to_session(dev));
602 void iscsi_host_for_each_session(struct Scsi_Host *shost,
603 void (*fn)(struct iscsi_cls_session *))
605 device_for_each_child(&shost->shost_gendev, fn,
606 iscsi_iter_session_fn);
608 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
611 * iscsi_scan_finished - helper to report when running scans are done
613 * @time: scan run time
615 * This function can be used by drives like qla4xxx to report to the scsi
616 * layer when the scans it kicked off at module load time are done.
618 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
620 struct iscsi_cls_host *ihost = shost->shost_data;
622 * qla4xxx will have kicked off some session unblocks before calling
623 * scsi_scan_host, so just wait for them to complete.
625 return !atomic_read(&ihost->nr_scans);
627 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
629 struct iscsi_scan_data {
630 unsigned int channel;
635 static int iscsi_user_scan_session(struct device *dev, void *data)
637 struct iscsi_scan_data *scan_data = data;
638 struct iscsi_cls_session *session;
639 struct Scsi_Host *shost;
640 struct iscsi_cls_host *ihost;
644 if (!iscsi_is_session_dev(dev))
647 session = iscsi_dev_to_session(dev);
649 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
651 shost = iscsi_session_to_shost(session);
652 ihost = shost->shost_data;
654 mutex_lock(&ihost->mutex);
655 spin_lock_irqsave(&session->lock, flags);
656 if (session->state != ISCSI_SESSION_LOGGED_IN) {
657 spin_unlock_irqrestore(&session->lock, flags);
660 id = session->target_id;
661 spin_unlock_irqrestore(&session->lock, flags);
663 if (id != ISCSI_MAX_TARGET) {
664 if ((scan_data->channel == SCAN_WILD_CARD ||
665 scan_data->channel == 0) &&
666 (scan_data->id == SCAN_WILD_CARD ||
667 scan_data->id == id))
668 scsi_scan_target(&session->dev, 0, id,
673 mutex_unlock(&ihost->mutex);
674 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
678 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
681 struct iscsi_scan_data scan_data;
683 scan_data.channel = channel;
687 return device_for_each_child(&shost->shost_gendev, &scan_data,
688 iscsi_user_scan_session);
691 static void iscsi_scan_session(struct work_struct *work)
693 struct iscsi_cls_session *session =
694 container_of(work, struct iscsi_cls_session, scan_work);
695 struct Scsi_Host *shost = iscsi_session_to_shost(session);
696 struct iscsi_cls_host *ihost = shost->shost_data;
697 struct iscsi_scan_data scan_data;
699 scan_data.channel = 0;
700 scan_data.id = SCAN_WILD_CARD;
701 scan_data.lun = SCAN_WILD_CARD;
703 iscsi_user_scan_session(&session->dev, &scan_data);
704 atomic_dec(&ihost->nr_scans);
708 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
709 * @cmd: scsi cmd passed to scsi eh handler
711 * If the session is down this function will wait for the recovery
712 * timer to fire or for the session to be logged back in. If the
713 * recovery timer fires then FAST_IO_FAIL is returned. The caller
714 * should pass this error value to the scsi eh.
716 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
718 struct iscsi_cls_session *session =
719 starget_to_session(scsi_target(cmd->device));
723 spin_lock_irqsave(&session->lock, flags);
724 while (session->state != ISCSI_SESSION_LOGGED_IN) {
725 if (session->state == ISCSI_SESSION_FREE) {
729 spin_unlock_irqrestore(&session->lock, flags);
731 spin_lock_irqsave(&session->lock, flags);
733 spin_unlock_irqrestore(&session->lock, flags);
736 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
738 static void session_recovery_timedout(struct work_struct *work)
740 struct iscsi_cls_session *session =
741 container_of(work, struct iscsi_cls_session,
745 iscsi_cls_session_printk(KERN_INFO, session,
746 "session recovery timed out after %d secs\n",
747 session->recovery_tmo);
749 spin_lock_irqsave(&session->lock, flags);
750 switch (session->state) {
751 case ISCSI_SESSION_FAILED:
752 session->state = ISCSI_SESSION_FREE;
754 case ISCSI_SESSION_LOGGED_IN:
755 case ISCSI_SESSION_FREE:
756 /* we raced with the unblock's flush */
757 spin_unlock_irqrestore(&session->lock, flags);
760 spin_unlock_irqrestore(&session->lock, flags);
762 if (session->transport->session_recovery_timedout)
763 session->transport->session_recovery_timedout(session);
765 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
766 scsi_target_unblock(&session->dev);
767 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
770 static void __iscsi_unblock_session(struct work_struct *work)
772 struct iscsi_cls_session *session =
773 container_of(work, struct iscsi_cls_session,
775 struct Scsi_Host *shost = iscsi_session_to_shost(session);
776 struct iscsi_cls_host *ihost = shost->shost_data;
779 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
781 * The recovery and unblock work get run from the same workqueue,
782 * so try to cancel it if it was going to run after this unblock.
784 cancel_delayed_work(&session->recovery_work);
785 spin_lock_irqsave(&session->lock, flags);
786 session->state = ISCSI_SESSION_LOGGED_IN;
787 spin_unlock_irqrestore(&session->lock, flags);
789 scsi_target_unblock(&session->dev);
791 * Only do kernel scanning if the driver is properly hooked into
792 * the async scanning code (drivers like iscsi_tcp do login and
793 * scanning from userspace).
795 if (shost->hostt->scan_finished) {
796 if (scsi_queue_work(shost, &session->scan_work))
797 atomic_inc(&ihost->nr_scans);
799 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
803 * iscsi_unblock_session - set a session as logged in and start IO.
804 * @session: iscsi session
806 * Mark a session as ready to accept IO.
808 void iscsi_unblock_session(struct iscsi_cls_session *session)
810 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
812 * make sure all the events have completed before tell the driver
815 flush_workqueue(iscsi_eh_timer_workq);
817 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
819 static void __iscsi_block_session(struct work_struct *work)
821 struct iscsi_cls_session *session =
822 container_of(work, struct iscsi_cls_session,
826 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
827 spin_lock_irqsave(&session->lock, flags);
828 session->state = ISCSI_SESSION_FAILED;
829 spin_unlock_irqrestore(&session->lock, flags);
830 scsi_target_block(&session->dev);
831 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
832 if (session->recovery_tmo >= 0)
833 queue_delayed_work(iscsi_eh_timer_workq,
834 &session->recovery_work,
835 session->recovery_tmo * HZ);
838 void iscsi_block_session(struct iscsi_cls_session *session)
840 queue_work(iscsi_eh_timer_workq, &session->block_work);
842 EXPORT_SYMBOL_GPL(iscsi_block_session);
844 static void __iscsi_unbind_session(struct work_struct *work)
846 struct iscsi_cls_session *session =
847 container_of(work, struct iscsi_cls_session,
849 struct Scsi_Host *shost = iscsi_session_to_shost(session);
850 struct iscsi_cls_host *ihost = shost->shost_data;
853 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
855 /* Prevent new scans and make sure scanning is not in progress */
856 mutex_lock(&ihost->mutex);
857 spin_lock_irqsave(&session->lock, flags);
858 if (session->target_id == ISCSI_MAX_TARGET) {
859 spin_unlock_irqrestore(&session->lock, flags);
860 mutex_unlock(&ihost->mutex);
863 session->target_id = ISCSI_MAX_TARGET;
864 spin_unlock_irqrestore(&session->lock, flags);
865 mutex_unlock(&ihost->mutex);
867 scsi_remove_target(&session->dev);
868 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
869 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
872 struct iscsi_cls_session *
873 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
876 struct iscsi_cls_session *session;
878 session = kzalloc(sizeof(*session) + dd_size,
883 session->transport = transport;
884 session->recovery_tmo = 120;
885 session->state = ISCSI_SESSION_FREE;
886 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
887 INIT_LIST_HEAD(&session->sess_list);
888 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
889 INIT_WORK(&session->block_work, __iscsi_block_session);
890 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
891 INIT_WORK(&session->scan_work, iscsi_scan_session);
892 spin_lock_init(&session->lock);
894 /* this is released in the dev's release function */
895 scsi_host_get(shost);
896 session->dev.parent = &shost->shost_gendev;
897 session->dev.release = iscsi_session_release;
898 device_initialize(&session->dev);
900 session->dd_data = &session[1];
902 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
905 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
907 static int iscsi_get_next_target_id(struct device *dev, void *data)
909 struct iscsi_cls_session *session;
913 if (!iscsi_is_session_dev(dev))
916 session = iscsi_dev_to_session(dev);
917 spin_lock_irqsave(&session->lock, flags);
918 if (*((unsigned int *) data) == session->target_id)
920 spin_unlock_irqrestore(&session->lock, flags);
924 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
926 struct Scsi_Host *shost = iscsi_session_to_shost(session);
927 struct iscsi_cls_host *ihost;
929 unsigned int id = target_id;
932 ihost = shost->shost_data;
933 session->sid = atomic_add_return(1, &iscsi_session_nr);
935 if (id == ISCSI_MAX_TARGET) {
936 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
937 err = device_for_each_child(&shost->shost_gendev, &id,
938 iscsi_get_next_target_id);
943 if (id == ISCSI_MAX_TARGET) {
944 iscsi_cls_session_printk(KERN_ERR, session,
945 "Too many iscsi targets. Max "
946 "number of targets is %d.\n",
947 ISCSI_MAX_TARGET - 1);
952 session->target_id = id;
954 dev_set_name(&session->dev, "session%u", session->sid);
955 err = device_add(&session->dev);
957 iscsi_cls_session_printk(KERN_ERR, session,
958 "could not register session's dev\n");
961 transport_register_device(&session->dev);
963 spin_lock_irqsave(&sesslock, flags);
964 list_add(&session->sess_list, &sesslist);
965 spin_unlock_irqrestore(&sesslock, flags);
967 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
968 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
972 scsi_host_put(shost);
975 EXPORT_SYMBOL_GPL(iscsi_add_session);
978 * iscsi_create_session - create iscsi class session
980 * @transport: iscsi transport
981 * @dd_size: private driver data size
982 * @target_id: which target
984 * This can be called from a LLD or iscsi_transport.
986 struct iscsi_cls_session *
987 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
988 int dd_size, unsigned int target_id)
990 struct iscsi_cls_session *session;
992 session = iscsi_alloc_session(shost, transport, dd_size);
996 if (iscsi_add_session(session, target_id)) {
997 iscsi_free_session(session);
1002 EXPORT_SYMBOL_GPL(iscsi_create_session);
1004 static void iscsi_conn_release(struct device *dev)
1006 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1007 struct device *parent = conn->dev.parent;
1009 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1014 static int iscsi_is_conn_dev(const struct device *dev)
1016 return dev->release == iscsi_conn_release;
1019 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1021 if (!iscsi_is_conn_dev(dev))
1023 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1026 void iscsi_remove_session(struct iscsi_cls_session *session)
1028 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1029 unsigned long flags;
1032 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1034 spin_lock_irqsave(&sesslock, flags);
1035 list_del(&session->sess_list);
1036 spin_unlock_irqrestore(&sesslock, flags);
1038 /* make sure there are no blocks/unblocks queued */
1039 flush_workqueue(iscsi_eh_timer_workq);
1040 /* make sure the timedout callout is not running */
1041 if (!cancel_delayed_work(&session->recovery_work))
1042 flush_workqueue(iscsi_eh_timer_workq);
1044 * If we are blocked let commands flow again. The lld or iscsi
1045 * layer should set up the queuecommand to fail commands.
1046 * We assume that LLD will not be calling block/unblock while
1047 * removing the session.
1049 spin_lock_irqsave(&session->lock, flags);
1050 session->state = ISCSI_SESSION_FREE;
1051 spin_unlock_irqrestore(&session->lock, flags);
1053 scsi_target_unblock(&session->dev);
1054 /* flush running scans then delete devices */
1055 scsi_flush_work(shost);
1056 __iscsi_unbind_session(&session->unbind_work);
1058 /* hw iscsi may not have removed all connections from session */
1059 err = device_for_each_child(&session->dev, NULL,
1060 iscsi_iter_destroy_conn_fn);
1062 iscsi_cls_session_printk(KERN_ERR, session,
1063 "Could not delete all connections "
1064 "for session. Error %d.\n", err);
1066 transport_unregister_device(&session->dev);
1068 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1069 device_del(&session->dev);
1071 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1073 void iscsi_free_session(struct iscsi_cls_session *session)
1075 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1076 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1077 put_device(&session->dev);
1079 EXPORT_SYMBOL_GPL(iscsi_free_session);
1082 * iscsi_destroy_session - destroy iscsi session
1083 * @session: iscsi_session
1085 * Can be called by a LLD or iscsi_transport. There must not be
1086 * any running connections.
1088 int iscsi_destroy_session(struct iscsi_cls_session *session)
1090 iscsi_remove_session(session);
1091 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1092 iscsi_free_session(session);
1095 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1098 * iscsi_create_conn - create iscsi class connection
1099 * @session: iscsi cls session
1100 * @dd_size: private driver data size
1101 * @cid: connection id
1103 * This can be called from a LLD or iscsi_transport. The connection
1104 * is child of the session so cid must be unique for all connections
1107 * Since we do not support MCS, cid will normally be zero. In some cases
1108 * for software iscsi we could be trying to preallocate a connection struct
1109 * in which case there could be two connection structs and cid would be
1112 struct iscsi_cls_conn *
1113 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1115 struct iscsi_transport *transport = session->transport;
1116 struct iscsi_cls_conn *conn;
1117 unsigned long flags;
1120 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1124 conn->dd_data = &conn[1];
1126 mutex_init(&conn->ep_mutex);
1127 INIT_LIST_HEAD(&conn->conn_list);
1128 conn->transport = transport;
1131 /* this is released in the dev's release function */
1132 if (!get_device(&session->dev))
1135 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1136 conn->dev.parent = &session->dev;
1137 conn->dev.release = iscsi_conn_release;
1138 err = device_register(&conn->dev);
1140 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1141 "register connection's dev\n");
1142 goto release_parent_ref;
1144 transport_register_device(&conn->dev);
1146 spin_lock_irqsave(&connlock, flags);
1147 list_add(&conn->conn_list, &connlist);
1148 spin_unlock_irqrestore(&connlock, flags);
1150 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1154 put_device(&session->dev);
1160 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1163 * iscsi_destroy_conn - destroy iscsi class connection
1164 * @conn: iscsi cls session
1166 * This can be called from a LLD or iscsi_transport.
1168 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1170 unsigned long flags;
1172 spin_lock_irqsave(&connlock, flags);
1173 list_del(&conn->conn_list);
1174 spin_unlock_irqrestore(&connlock, flags);
1176 transport_unregister_device(&conn->dev);
1177 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1178 device_unregister(&conn->dev);
1181 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1184 * iscsi interface functions
1186 static struct iscsi_internal *
1187 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1189 struct iscsi_internal *priv;
1190 unsigned long flags;
1192 spin_lock_irqsave(&iscsi_transport_lock, flags);
1193 list_for_each_entry(priv, &iscsi_transports, list) {
1194 if (tt == priv->iscsi_transport) {
1195 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1199 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1204 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1206 return nlmsg_multicast(nls, skb, 0, group, gfp);
1209 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1210 char *data, uint32_t data_size)
1212 struct nlmsghdr *nlh;
1213 struct sk_buff *skb;
1214 struct iscsi_uevent *ev;
1216 struct iscsi_internal *priv;
1217 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1220 priv = iscsi_if_transport_lookup(conn->transport);
1224 skb = alloc_skb(len, GFP_ATOMIC);
1226 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1227 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1228 "control PDU: OOM\n");
1232 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1233 ev = NLMSG_DATA(nlh);
1234 memset(ev, 0, sizeof(*ev));
1235 ev->transport_handle = iscsi_handle(conn->transport);
1236 ev->type = ISCSI_KEVENT_RECV_PDU;
1237 ev->r.recv_req.cid = conn->cid;
1238 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1239 pdu = (char*)ev + sizeof(*ev);
1240 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1241 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1243 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1245 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1247 int iscsi_offload_mesg(struct Scsi_Host *shost,
1248 struct iscsi_transport *transport, uint32_t type,
1249 char *data, uint16_t data_size)
1251 struct nlmsghdr *nlh;
1252 struct sk_buff *skb;
1253 struct iscsi_uevent *ev;
1254 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1256 skb = alloc_skb(len, GFP_ATOMIC);
1258 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1262 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1263 ev = NLMSG_DATA(nlh);
1264 memset(ev, 0, sizeof(*ev));
1266 ev->transport_handle = iscsi_handle(transport);
1268 case ISCSI_KEVENT_PATH_REQ:
1269 ev->r.req_path.host_no = shost->host_no;
1271 case ISCSI_KEVENT_IF_DOWN:
1272 ev->r.notify_if_down.host_no = shost->host_no;
1276 memcpy((char *)ev + sizeof(*ev), data, data_size);
1278 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1280 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1282 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1284 struct nlmsghdr *nlh;
1285 struct sk_buff *skb;
1286 struct iscsi_uevent *ev;
1287 struct iscsi_internal *priv;
1288 int len = NLMSG_SPACE(sizeof(*ev));
1290 priv = iscsi_if_transport_lookup(conn->transport);
1294 skb = alloc_skb(len, GFP_ATOMIC);
1296 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1297 "conn error (%d)\n", error);
1301 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1302 ev = NLMSG_DATA(nlh);
1303 ev->transport_handle = iscsi_handle(conn->transport);
1304 ev->type = ISCSI_KEVENT_CONN_ERROR;
1305 ev->r.connerror.error = error;
1306 ev->r.connerror.cid = conn->cid;
1307 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1309 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1311 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1314 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1317 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1318 void *payload, int size)
1320 struct sk_buff *skb;
1321 struct nlmsghdr *nlh;
1322 int len = NLMSG_SPACE(size);
1323 int flags = multi ? NLM_F_MULTI : 0;
1324 int t = done ? NLMSG_DONE : type;
1326 skb = alloc_skb(len, GFP_ATOMIC);
1328 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1332 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1333 nlh->nlmsg_flags = flags;
1334 memcpy(NLMSG_DATA(nlh), payload, size);
1335 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1339 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1341 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1342 struct iscsi_stats *stats;
1343 struct sk_buff *skbstat;
1344 struct iscsi_cls_conn *conn;
1345 struct nlmsghdr *nlhstat;
1346 struct iscsi_uevent *evstat;
1347 struct iscsi_internal *priv;
1348 int len = NLMSG_SPACE(sizeof(*ev) +
1349 sizeof(struct iscsi_stats) +
1350 sizeof(struct iscsi_stats_custom) *
1351 ISCSI_STATS_CUSTOM_MAX);
1354 priv = iscsi_if_transport_lookup(transport);
1358 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1365 skbstat = alloc_skb(len, GFP_ATOMIC);
1367 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1368 "deliver stats: OOM\n");
1372 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1373 (len - sizeof(*nlhstat)), 0);
1374 evstat = NLMSG_DATA(nlhstat);
1375 memset(evstat, 0, sizeof(*evstat));
1376 evstat->transport_handle = iscsi_handle(conn->transport);
1377 evstat->type = nlh->nlmsg_type;
1378 evstat->u.get_stats.cid =
1379 ev->u.get_stats.cid;
1380 evstat->u.get_stats.sid =
1381 ev->u.get_stats.sid;
1382 stats = (struct iscsi_stats *)
1383 ((char*)evstat + sizeof(*evstat));
1384 memset(stats, 0, sizeof(*stats));
1386 transport->get_stats(conn, stats);
1387 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1388 sizeof(struct iscsi_stats) +
1389 sizeof(struct iscsi_stats_custom) *
1390 stats->custom_length);
1391 actual_size -= sizeof(*nlhstat);
1392 actual_size = NLMSG_LENGTH(actual_size);
1393 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1394 nlhstat->nlmsg_len = actual_size;
1396 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1398 } while (err < 0 && err != -ECONNREFUSED);
1404 * iscsi_session_event - send session destr. completion event
1405 * @session: iscsi class session
1406 * @event: type of event
1408 int iscsi_session_event(struct iscsi_cls_session *session,
1409 enum iscsi_uevent_e event)
1411 struct iscsi_internal *priv;
1412 struct Scsi_Host *shost;
1413 struct iscsi_uevent *ev;
1414 struct sk_buff *skb;
1415 struct nlmsghdr *nlh;
1416 int rc, len = NLMSG_SPACE(sizeof(*ev));
1418 priv = iscsi_if_transport_lookup(session->transport);
1421 shost = iscsi_session_to_shost(session);
1423 skb = alloc_skb(len, GFP_KERNEL);
1425 iscsi_cls_session_printk(KERN_ERR, session,
1426 "Cannot notify userspace of session "
1427 "event %u\n", event);
1431 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1432 ev = NLMSG_DATA(nlh);
1433 ev->transport_handle = iscsi_handle(session->transport);
1437 case ISCSI_KEVENT_DESTROY_SESSION:
1438 ev->r.d_session.host_no = shost->host_no;
1439 ev->r.d_session.sid = session->sid;
1441 case ISCSI_KEVENT_CREATE_SESSION:
1442 ev->r.c_session_ret.host_no = shost->host_no;
1443 ev->r.c_session_ret.sid = session->sid;
1445 case ISCSI_KEVENT_UNBIND_SESSION:
1446 ev->r.unbind_session.host_no = shost->host_no;
1447 ev->r.unbind_session.sid = session->sid;
1450 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1457 * this will occur if the daemon is not up, so we just warn
1458 * the user and when the daemon is restarted it will handle it
1460 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1462 iscsi_cls_session_printk(KERN_ERR, session,
1463 "Cannot notify userspace of session "
1464 "event %u. Check iscsi daemon\n",
1467 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1471 EXPORT_SYMBOL_GPL(iscsi_session_event);
1474 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1475 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1476 uint16_t cmds_max, uint16_t queue_depth)
1478 struct iscsi_transport *transport = priv->iscsi_transport;
1479 struct iscsi_cls_session *session;
1480 struct Scsi_Host *shost;
1482 session = transport->create_session(ep, cmds_max, queue_depth,
1487 shost = iscsi_session_to_shost(session);
1488 ev->r.c_session_ret.host_no = shost->host_no;
1489 ev->r.c_session_ret.sid = session->sid;
1490 ISCSI_DBG_TRANS_SESSION(session,
1491 "Completed creating transport session\n");
1496 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1498 struct iscsi_cls_conn *conn;
1499 struct iscsi_cls_session *session;
1501 session = iscsi_session_lookup(ev->u.c_conn.sid);
1503 printk(KERN_ERR "iscsi: invalid session %d.\n",
1508 conn = transport->create_conn(session, ev->u.c_conn.cid);
1510 iscsi_cls_session_printk(KERN_ERR, session,
1511 "couldn't create a new connection.");
1515 ev->r.c_conn_ret.sid = session->sid;
1516 ev->r.c_conn_ret.cid = conn->cid;
1518 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1523 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1525 struct iscsi_cls_conn *conn;
1527 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1531 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1532 if (transport->destroy_conn)
1533 transport->destroy_conn(conn);
1539 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1541 char *data = (char*)ev + sizeof(*ev);
1542 struct iscsi_cls_conn *conn;
1543 struct iscsi_cls_session *session;
1544 int err = 0, value = 0;
1546 session = iscsi_session_lookup(ev->u.set_param.sid);
1547 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1548 if (!conn || !session)
1551 switch (ev->u.set_param.param) {
1552 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1553 sscanf(data, "%d", &value);
1554 session->recovery_tmo = value;
1557 err = transport->set_param(conn, ev->u.set_param.param,
1558 data, ev->u.set_param.len);
1564 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1565 struct iscsi_uevent *ev, int msg_type)
1567 struct iscsi_endpoint *ep;
1568 struct sockaddr *dst_addr;
1569 struct Scsi_Host *shost = NULL;
1570 int non_blocking, err = 0;
1572 if (!transport->ep_connect)
1575 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1576 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1578 printk(KERN_ERR "ep connect failed. Could not find "
1580 ev->u.ep_connect_through_host.host_no);
1583 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1585 non_blocking = ev->u.ep_connect.non_blocking;
1587 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1588 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1594 ev->r.ep_connect_ret.handle = ep->id;
1597 scsi_host_put(shost);
1601 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1604 struct iscsi_cls_conn *conn;
1605 struct iscsi_endpoint *ep;
1607 if (!transport->ep_disconnect)
1610 ep = iscsi_lookup_endpoint(ep_handle);
1615 mutex_lock(&conn->ep_mutex);
1617 mutex_unlock(&conn->ep_mutex);
1620 transport->ep_disconnect(ep);
1625 iscsi_if_transport_ep(struct iscsi_transport *transport,
1626 struct iscsi_uevent *ev, int msg_type)
1628 struct iscsi_endpoint *ep;
1632 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1633 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1634 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1636 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1637 if (!transport->ep_poll)
1640 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1644 ev->r.retcode = transport->ep_poll(ep,
1645 ev->u.ep_poll.timeout_ms);
1647 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1648 rc = iscsi_if_ep_disconnect(transport,
1649 ev->u.ep_disconnect.ep_handle);
1656 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1657 struct iscsi_uevent *ev)
1659 struct Scsi_Host *shost;
1660 struct sockaddr *dst_addr;
1663 if (!transport->tgt_dscvr)
1666 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1668 printk(KERN_ERR "target discovery could not find host no %u\n",
1669 ev->u.tgt_dscvr.host_no);
1674 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1675 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1676 ev->u.tgt_dscvr.enable, dst_addr);
1677 scsi_host_put(shost);
1682 iscsi_set_host_param(struct iscsi_transport *transport,
1683 struct iscsi_uevent *ev)
1685 char *data = (char*)ev + sizeof(*ev);
1686 struct Scsi_Host *shost;
1689 if (!transport->set_host_param)
1692 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1694 printk(KERN_ERR "set_host_param could not find host no %u\n",
1695 ev->u.set_host_param.host_no);
1699 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1700 data, ev->u.set_host_param.len);
1701 scsi_host_put(shost);
1706 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1708 struct Scsi_Host *shost;
1709 struct iscsi_path *params;
1712 if (!transport->set_path)
1715 shost = scsi_host_lookup(ev->u.set_path.host_no);
1717 printk(KERN_ERR "set path could not find host no %u\n",
1718 ev->u.set_path.host_no);
1722 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1723 err = transport->set_path(shost, params);
1725 scsi_host_put(shost);
1730 iscsi_set_iface_params(struct iscsi_transport *transport,
1731 struct iscsi_uevent *ev)
1733 char *data = (char *)ev + sizeof(*ev);
1734 struct Scsi_Host *shost;
1737 if (!transport->set_iface_param)
1740 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1742 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1743 ev->u.set_iface_params.host_no);
1747 err = transport->set_iface_param(shost, data,
1748 ev->u.set_iface_params.count);
1749 scsi_host_put(shost);
1754 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1757 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1758 struct iscsi_transport *transport = NULL;
1759 struct iscsi_internal *priv;
1760 struct iscsi_cls_session *session;
1761 struct iscsi_cls_conn *conn;
1762 struct iscsi_endpoint *ep = NULL;
1764 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1765 *group = ISCSI_NL_GRP_UIP;
1767 *group = ISCSI_NL_GRP_ISCSID;
1769 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1772 transport = priv->iscsi_transport;
1774 if (!try_module_get(transport->owner))
1777 switch (nlh->nlmsg_type) {
1778 case ISCSI_UEVENT_CREATE_SESSION:
1779 err = iscsi_if_create_session(priv, ep, ev,
1780 ev->u.c_session.initial_cmdsn,
1781 ev->u.c_session.cmds_max,
1782 ev->u.c_session.queue_depth);
1784 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1785 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1791 err = iscsi_if_create_session(priv, ep, ev,
1792 ev->u.c_bound_session.initial_cmdsn,
1793 ev->u.c_bound_session.cmds_max,
1794 ev->u.c_bound_session.queue_depth);
1796 case ISCSI_UEVENT_DESTROY_SESSION:
1797 session = iscsi_session_lookup(ev->u.d_session.sid);
1799 transport->destroy_session(session);
1803 case ISCSI_UEVENT_UNBIND_SESSION:
1804 session = iscsi_session_lookup(ev->u.d_session.sid);
1806 scsi_queue_work(iscsi_session_to_shost(session),
1807 &session->unbind_work);
1811 case ISCSI_UEVENT_CREATE_CONN:
1812 err = iscsi_if_create_conn(transport, ev);
1814 case ISCSI_UEVENT_DESTROY_CONN:
1815 err = iscsi_if_destroy_conn(transport, ev);
1817 case ISCSI_UEVENT_BIND_CONN:
1818 session = iscsi_session_lookup(ev->u.b_conn.sid);
1819 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1821 if (conn && conn->ep)
1822 iscsi_if_ep_disconnect(transport, conn->ep->id);
1824 if (!session || !conn) {
1829 ev->r.retcode = transport->bind_conn(session, conn,
1830 ev->u.b_conn.transport_eph,
1831 ev->u.b_conn.is_leading);
1832 if (ev->r.retcode || !transport->ep_connect)
1835 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1839 mutex_lock(&conn->ep_mutex);
1841 mutex_unlock(&conn->ep_mutex);
1843 iscsi_cls_conn_printk(KERN_ERR, conn,
1844 "Could not set ep conn "
1847 case ISCSI_UEVENT_SET_PARAM:
1848 err = iscsi_set_param(transport, ev);
1850 case ISCSI_UEVENT_START_CONN:
1851 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1853 ev->r.retcode = transport->start_conn(conn);
1857 case ISCSI_UEVENT_STOP_CONN:
1858 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1860 transport->stop_conn(conn, ev->u.stop_conn.flag);
1864 case ISCSI_UEVENT_SEND_PDU:
1865 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1867 ev->r.retcode = transport->send_pdu(conn,
1868 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1869 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1870 ev->u.send_pdu.data_size);
1874 case ISCSI_UEVENT_GET_STATS:
1875 err = iscsi_if_get_stats(transport, nlh);
1877 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1878 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1879 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1880 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1881 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1883 case ISCSI_UEVENT_TGT_DSCVR:
1884 err = iscsi_tgt_dscvr(transport, ev);
1886 case ISCSI_UEVENT_SET_HOST_PARAM:
1887 err = iscsi_set_host_param(transport, ev);
1889 case ISCSI_UEVENT_PATH_UPDATE:
1890 err = iscsi_set_path(transport, ev);
1892 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1893 err = iscsi_set_iface_params(transport, ev);
1900 module_put(transport->owner);
1905 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1906 * Malformed skbs with wrong lengths or invalid creds are not processed.
1909 iscsi_if_rx(struct sk_buff *skb)
1911 mutex_lock(&rx_queue_mutex);
1912 while (skb->len >= NLMSG_SPACE(0)) {
1915 struct nlmsghdr *nlh;
1916 struct iscsi_uevent *ev;
1919 nlh = nlmsg_hdr(skb);
1920 if (nlh->nlmsg_len < sizeof(*nlh) ||
1921 skb->len < nlh->nlmsg_len) {
1925 ev = NLMSG_DATA(nlh);
1926 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1927 if (rlen > skb->len)
1930 err = iscsi_if_recv_msg(skb, nlh, &group);
1932 ev->type = ISCSI_KEVENT_IF_ERROR;
1937 * special case for GET_STATS:
1938 * on success - sending reply and stats from
1939 * inside of if_recv_msg(),
1940 * on error - fall through.
1942 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1944 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1945 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1946 } while (err < 0 && err != -ECONNREFUSED);
1947 skb_pull(skb, rlen);
1949 mutex_unlock(&rx_queue_mutex);
1952 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1953 struct device_attribute dev_attr_##_prefix##_##_name = \
1954 __ATTR(_name,_mode,_show,_store)
1957 * iSCSI connection attrs
1959 #define iscsi_conn_attr_show(param) \
1961 show_conn_param_##param(struct device *dev, \
1962 struct device_attribute *attr, char *buf) \
1964 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1965 struct iscsi_transport *t = conn->transport; \
1966 return t->get_conn_param(conn, param, buf); \
1969 #define iscsi_conn_attr(field, param) \
1970 iscsi_conn_attr_show(param) \
1971 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1974 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1975 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1976 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1977 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1978 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1979 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1980 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1981 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1982 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1983 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1984 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1986 #define iscsi_conn_ep_attr_show(param) \
1987 static ssize_t show_conn_ep_param_##param(struct device *dev, \
1988 struct device_attribute *attr,\
1991 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1992 struct iscsi_transport *t = conn->transport; \
1993 struct iscsi_endpoint *ep; \
1997 * Need to make sure ep_disconnect does not free the LLD's \
1998 * interconnect resources while we are trying to read them. \
2000 mutex_lock(&conn->ep_mutex); \
2002 if (!ep && t->ep_connect) { \
2003 mutex_unlock(&conn->ep_mutex); \
2008 rc = t->get_ep_param(ep, param, buf); \
2010 rc = t->get_conn_param(conn, param, buf); \
2011 mutex_unlock(&conn->ep_mutex); \
2015 #define iscsi_conn_ep_attr(field, param) \
2016 iscsi_conn_ep_attr_show(param) \
2017 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2018 show_conn_ep_param_##param, NULL);
2020 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2021 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2023 static struct attribute *iscsi_conn_attrs[] = {
2024 &dev_attr_conn_max_recv_dlength.attr,
2025 &dev_attr_conn_max_xmit_dlength.attr,
2026 &dev_attr_conn_header_digest.attr,
2027 &dev_attr_conn_data_digest.attr,
2028 &dev_attr_conn_ifmarker.attr,
2029 &dev_attr_conn_ofmarker.attr,
2030 &dev_attr_conn_address.attr,
2031 &dev_attr_conn_port.attr,
2032 &dev_attr_conn_exp_statsn.attr,
2033 &dev_attr_conn_persistent_address.attr,
2034 &dev_attr_conn_persistent_port.attr,
2035 &dev_attr_conn_ping_tmo.attr,
2036 &dev_attr_conn_recv_tmo.attr,
2040 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2041 struct attribute *attr, int i)
2043 struct device *cdev = container_of(kobj, struct device, kobj);
2044 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2045 struct iscsi_transport *t = conn->transport;
2048 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2049 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2050 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2051 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2052 else if (attr == &dev_attr_conn_header_digest.attr)
2053 param = ISCSI_PARAM_HDRDGST_EN;
2054 else if (attr == &dev_attr_conn_data_digest.attr)
2055 param = ISCSI_PARAM_DATADGST_EN;
2056 else if (attr == &dev_attr_conn_ifmarker.attr)
2057 param = ISCSI_PARAM_IFMARKER_EN;
2058 else if (attr == &dev_attr_conn_ofmarker.attr)
2059 param = ISCSI_PARAM_OFMARKER_EN;
2060 else if (attr == &dev_attr_conn_address.attr)
2061 param = ISCSI_PARAM_CONN_ADDRESS;
2062 else if (attr == &dev_attr_conn_port.attr)
2063 param = ISCSI_PARAM_CONN_PORT;
2064 else if (attr == &dev_attr_conn_exp_statsn.attr)
2065 param = ISCSI_PARAM_EXP_STATSN;
2066 else if (attr == &dev_attr_conn_persistent_address.attr)
2067 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2068 else if (attr == &dev_attr_conn_persistent_port.attr)
2069 param = ISCSI_PARAM_PERSISTENT_PORT;
2070 else if (attr == &dev_attr_conn_ping_tmo.attr)
2071 param = ISCSI_PARAM_PING_TMO;
2072 else if (attr == &dev_attr_conn_recv_tmo.attr)
2073 param = ISCSI_PARAM_RECV_TMO;
2075 WARN_ONCE(1, "Invalid conn attr");
2079 return t->attr_is_visible(ISCSI_PARAM, param);
2082 static struct attribute_group iscsi_conn_group = {
2083 .attrs = iscsi_conn_attrs,
2084 .is_visible = iscsi_conn_attr_is_visible,
2088 * iSCSI session attrs
2090 #define iscsi_session_attr_show(param, perm) \
2092 show_session_param_##param(struct device *dev, \
2093 struct device_attribute *attr, char *buf) \
2095 struct iscsi_cls_session *session = \
2096 iscsi_dev_to_session(dev->parent); \
2097 struct iscsi_transport *t = session->transport; \
2099 if (perm && !capable(CAP_SYS_ADMIN)) \
2101 return t->get_session_param(session, param, buf); \
2104 #define iscsi_session_attr(field, param, perm) \
2105 iscsi_session_attr_show(param, perm) \
2106 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2108 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2109 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2110 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2111 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2112 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2113 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2114 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2115 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2116 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2117 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2118 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2119 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2120 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2121 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2122 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2123 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2124 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2125 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2126 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2127 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2128 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2131 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2134 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2135 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2137 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2140 #define iscsi_priv_session_attr_show(field, format) \
2142 show_priv_session_##field(struct device *dev, \
2143 struct device_attribute *attr, char *buf) \
2145 struct iscsi_cls_session *session = \
2146 iscsi_dev_to_session(dev->parent); \
2147 if (session->field == -1) \
2148 return sprintf(buf, "off\n"); \
2149 return sprintf(buf, format"\n", session->field); \
2152 #define iscsi_priv_session_attr_store(field) \
2154 store_priv_session_##field(struct device *dev, \
2155 struct device_attribute *attr, \
2156 const char *buf, size_t count) \
2160 struct iscsi_cls_session *session = \
2161 iscsi_dev_to_session(dev->parent); \
2162 if ((session->state == ISCSI_SESSION_FREE) || \
2163 (session->state == ISCSI_SESSION_FAILED)) \
2165 if (strncmp(buf, "off", 3) == 0) \
2166 session->field = -1; \
2168 val = simple_strtoul(buf, &cp, 0); \
2169 if (*cp != '\0' && *cp != '\n') \
2171 session->field = val; \
2176 #define iscsi_priv_session_rw_attr(field, format) \
2177 iscsi_priv_session_attr_show(field, format) \
2178 iscsi_priv_session_attr_store(field) \
2179 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
2180 show_priv_session_##field, \
2181 store_priv_session_##field)
2182 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2184 static struct attribute *iscsi_session_attrs[] = {
2185 &dev_attr_sess_initial_r2t.attr,
2186 &dev_attr_sess_max_outstanding_r2t.attr,
2187 &dev_attr_sess_immediate_data.attr,
2188 &dev_attr_sess_first_burst_len.attr,
2189 &dev_attr_sess_max_burst_len.attr,
2190 &dev_attr_sess_data_pdu_in_order.attr,
2191 &dev_attr_sess_data_seq_in_order.attr,
2192 &dev_attr_sess_erl.attr,
2193 &dev_attr_sess_targetname.attr,
2194 &dev_attr_sess_tpgt.attr,
2195 &dev_attr_sess_password.attr,
2196 &dev_attr_sess_password_in.attr,
2197 &dev_attr_sess_username.attr,
2198 &dev_attr_sess_username_in.attr,
2199 &dev_attr_sess_fast_abort.attr,
2200 &dev_attr_sess_abort_tmo.attr,
2201 &dev_attr_sess_lu_reset_tmo.attr,
2202 &dev_attr_sess_tgt_reset_tmo.attr,
2203 &dev_attr_sess_ifacename.attr,
2204 &dev_attr_sess_initiatorname.attr,
2205 &dev_attr_sess_targetalias.attr,
2206 &dev_attr_priv_sess_recovery_tmo.attr,
2207 &dev_attr_priv_sess_state.attr,
2211 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2212 struct attribute *attr, int i)
2214 struct device *cdev = container_of(kobj, struct device, kobj);
2215 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2216 struct iscsi_transport *t = session->transport;
2219 if (attr == &dev_attr_sess_initial_r2t.attr)
2220 param = ISCSI_PARAM_INITIAL_R2T_EN;
2221 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2222 param = ISCSI_PARAM_MAX_R2T;
2223 else if (attr == &dev_attr_sess_immediate_data.attr)
2224 param = ISCSI_PARAM_IMM_DATA_EN;
2225 else if (attr == &dev_attr_sess_first_burst_len.attr)
2226 param = ISCSI_PARAM_FIRST_BURST;
2227 else if (attr == &dev_attr_sess_max_burst_len.attr)
2228 param = ISCSI_PARAM_MAX_BURST;
2229 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2230 param = ISCSI_PARAM_PDU_INORDER_EN;
2231 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2232 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2233 else if (attr == &dev_attr_sess_erl.attr)
2234 param = ISCSI_PARAM_ERL;
2235 else if (attr == &dev_attr_sess_targetname.attr)
2236 param = ISCSI_PARAM_TARGET_NAME;
2237 else if (attr == &dev_attr_sess_tpgt.attr)
2238 param = ISCSI_PARAM_TPGT;
2239 else if (attr == &dev_attr_sess_password.attr)
2240 param = ISCSI_PARAM_USERNAME;
2241 else if (attr == &dev_attr_sess_password_in.attr)
2242 param = ISCSI_PARAM_USERNAME_IN;
2243 else if (attr == &dev_attr_sess_username.attr)
2244 param = ISCSI_PARAM_PASSWORD;
2245 else if (attr == &dev_attr_sess_username_in.attr)
2246 param = ISCSI_PARAM_PASSWORD_IN;
2247 else if (attr == &dev_attr_sess_fast_abort.attr)
2248 param = ISCSI_PARAM_FAST_ABORT;
2249 else if (attr == &dev_attr_sess_abort_tmo.attr)
2250 param = ISCSI_PARAM_ABORT_TMO;
2251 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2252 param = ISCSI_PARAM_LU_RESET_TMO;
2253 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2254 param = ISCSI_PARAM_TGT_RESET_TMO;
2255 else if (attr == &dev_attr_sess_ifacename.attr)
2256 param = ISCSI_PARAM_IFACE_NAME;
2257 else if (attr == &dev_attr_sess_initiatorname.attr)
2258 param = ISCSI_PARAM_INITIATOR_NAME;
2259 else if (attr == &dev_attr_sess_targetalias.attr)
2260 param = ISCSI_PARAM_TARGET_ALIAS;
2261 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2262 return S_IRUGO | S_IWUSR;
2263 else if (attr == &dev_attr_priv_sess_state.attr)
2266 WARN_ONCE(1, "Invalid session attr");
2270 return t->attr_is_visible(ISCSI_PARAM, param);
2273 static struct attribute_group iscsi_session_group = {
2274 .attrs = iscsi_session_attrs,
2275 .is_visible = iscsi_session_attr_is_visible,
2281 #define iscsi_host_attr_show(param) \
2283 show_host_param_##param(struct device *dev, \
2284 struct device_attribute *attr, char *buf) \
2286 struct Scsi_Host *shost = transport_class_to_shost(dev); \
2287 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2288 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2291 #define iscsi_host_attr(field, param) \
2292 iscsi_host_attr_show(param) \
2293 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2296 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2297 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2298 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2299 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2301 static struct attribute *iscsi_host_attrs[] = {
2302 &dev_attr_host_netdev.attr,
2303 &dev_attr_host_hwaddress.attr,
2304 &dev_attr_host_ipaddress.attr,
2305 &dev_attr_host_initiatorname.attr,
2309 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2310 struct attribute *attr, int i)
2312 struct device *cdev = container_of(kobj, struct device, kobj);
2313 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2314 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2317 if (attr == &dev_attr_host_netdev.attr)
2318 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2319 else if (attr == &dev_attr_host_hwaddress.attr)
2320 param = ISCSI_HOST_PARAM_HWADDRESS;
2321 else if (attr == &dev_attr_host_ipaddress.attr)
2322 param = ISCSI_HOST_PARAM_IPADDRESS;
2323 else if (attr == &dev_attr_host_initiatorname.attr)
2324 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2326 WARN_ONCE(1, "Invalid host attr");
2330 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2333 static struct attribute_group iscsi_host_group = {
2334 .attrs = iscsi_host_attrs,
2335 .is_visible = iscsi_host_attr_is_visible,
2338 static int iscsi_session_match(struct attribute_container *cont,
2341 struct iscsi_cls_session *session;
2342 struct Scsi_Host *shost;
2343 struct iscsi_internal *priv;
2345 if (!iscsi_is_session_dev(dev))
2348 session = iscsi_dev_to_session(dev);
2349 shost = iscsi_session_to_shost(session);
2350 if (!shost->transportt)
2353 priv = to_iscsi_internal(shost->transportt);
2354 if (priv->session_cont.ac.class != &iscsi_session_class.class)
2357 return &priv->session_cont.ac == cont;
2360 static int iscsi_conn_match(struct attribute_container *cont,
2363 struct iscsi_cls_session *session;
2364 struct iscsi_cls_conn *conn;
2365 struct Scsi_Host *shost;
2366 struct iscsi_internal *priv;
2368 if (!iscsi_is_conn_dev(dev))
2371 conn = iscsi_dev_to_conn(dev);
2372 session = iscsi_dev_to_session(conn->dev.parent);
2373 shost = iscsi_session_to_shost(session);
2375 if (!shost->transportt)
2378 priv = to_iscsi_internal(shost->transportt);
2379 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2382 return &priv->conn_cont.ac == cont;
2385 static int iscsi_host_match(struct attribute_container *cont,
2388 struct Scsi_Host *shost;
2389 struct iscsi_internal *priv;
2391 if (!scsi_is_host_device(dev))
2394 shost = dev_to_shost(dev);
2395 if (!shost->transportt ||
2396 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2399 priv = to_iscsi_internal(shost->transportt);
2400 return &priv->t.host_attrs.ac == cont;
2403 struct scsi_transport_template *
2404 iscsi_register_transport(struct iscsi_transport *tt)
2406 struct iscsi_internal *priv;
2407 unsigned long flags;
2412 priv = iscsi_if_transport_lookup(tt);
2416 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2419 INIT_LIST_HEAD(&priv->list);
2420 priv->iscsi_transport = tt;
2421 priv->t.user_scan = iscsi_user_scan;
2422 priv->t.create_work_queue = 1;
2424 priv->dev.class = &iscsi_transport_class;
2425 dev_set_name(&priv->dev, "%s", tt->name);
2426 err = device_register(&priv->dev);
2430 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2432 goto unregister_dev;
2434 /* host parameters */
2435 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2436 priv->t.host_attrs.ac.match = iscsi_host_match;
2437 priv->t.host_attrs.ac.grp = &iscsi_host_group;
2438 priv->t.host_size = sizeof(struct iscsi_cls_host);
2439 transport_container_register(&priv->t.host_attrs);
2441 /* connection parameters */
2442 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2443 priv->conn_cont.ac.match = iscsi_conn_match;
2444 priv->conn_cont.ac.grp = &iscsi_conn_group;
2445 transport_container_register(&priv->conn_cont);
2447 /* session parameters */
2448 priv->session_cont.ac.class = &iscsi_session_class.class;
2449 priv->session_cont.ac.match = iscsi_session_match;
2450 priv->session_cont.ac.grp = &iscsi_session_group;
2451 transport_container_register(&priv->session_cont);
2453 spin_lock_irqsave(&iscsi_transport_lock, flags);
2454 list_add(&priv->list, &iscsi_transports);
2455 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2457 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2461 device_unregister(&priv->dev);
2467 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2469 int iscsi_unregister_transport(struct iscsi_transport *tt)
2471 struct iscsi_internal *priv;
2472 unsigned long flags;
2476 mutex_lock(&rx_queue_mutex);
2478 priv = iscsi_if_transport_lookup(tt);
2481 spin_lock_irqsave(&iscsi_transport_lock, flags);
2482 list_del(&priv->list);
2483 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2485 transport_container_unregister(&priv->conn_cont);
2486 transport_container_unregister(&priv->session_cont);
2487 transport_container_unregister(&priv->t.host_attrs);
2489 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2490 device_unregister(&priv->dev);
2491 mutex_unlock(&rx_queue_mutex);
2495 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2497 static __init int iscsi_transport_init(void)
2501 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2502 ISCSI_TRANSPORT_VERSION);
2504 atomic_set(&iscsi_session_nr, 0);
2506 err = class_register(&iscsi_transport_class);
2510 err = class_register(&iscsi_endpoint_class);
2512 goto unregister_transport_class;
2514 err = class_register(&iscsi_iface_class);
2516 goto unregister_endpoint_class;
2518 err = transport_class_register(&iscsi_host_class);
2520 goto unregister_iface_class;
2522 err = transport_class_register(&iscsi_connection_class);
2524 goto unregister_host_class;
2526 err = transport_class_register(&iscsi_session_class);
2528 goto unregister_conn_class;
2530 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2534 goto unregister_session_class;
2537 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2538 if (!iscsi_eh_timer_workq)
2544 netlink_kernel_release(nls);
2545 unregister_session_class:
2546 transport_class_unregister(&iscsi_session_class);
2547 unregister_conn_class:
2548 transport_class_unregister(&iscsi_connection_class);
2549 unregister_host_class:
2550 transport_class_unregister(&iscsi_host_class);
2551 unregister_iface_class:
2552 class_unregister(&iscsi_iface_class);
2553 unregister_endpoint_class:
2554 class_unregister(&iscsi_endpoint_class);
2555 unregister_transport_class:
2556 class_unregister(&iscsi_transport_class);
2560 static void __exit iscsi_transport_exit(void)
2562 destroy_workqueue(iscsi_eh_timer_workq);
2563 netlink_kernel_release(nls);
2564 transport_class_unregister(&iscsi_connection_class);
2565 transport_class_unregister(&iscsi_session_class);
2566 transport_class_unregister(&iscsi_host_class);
2567 class_unregister(&iscsi_endpoint_class);
2568 class_unregister(&iscsi_iface_class);
2569 class_unregister(&iscsi_transport_class);
2572 module_init(iscsi_transport_init);
2573 module_exit(iscsi_transport_exit);
2575 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2576 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2577 "Alex Aizman <itn780@yahoo.com>");
2578 MODULE_DESCRIPTION("iSCSI Transport Interface");
2579 MODULE_LICENSE("GPL");
2580 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2581 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);