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_HOST_ATTRS 4
37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
39 static int dbg_session;
40 module_param_named(debug_session, dbg_session, int,
42 MODULE_PARM_DESC(debug_session,
43 "Turn on debugging for sessions in scsi_transport_iscsi "
44 "module. Set to 1 to turn on, and zero to turn off. Default "
48 module_param_named(debug_conn, dbg_conn, int,
50 MODULE_PARM_DESC(debug_conn,
51 "Turn on debugging for connections in scsi_transport_iscsi "
52 "module. Set to 1 to turn on, and zero to turn off. Default "
55 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 iscsi_cls_session_printk(KERN_INFO, _session, \
63 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
66 iscsi_cls_conn_printk(KERN_INFO, _conn, \
71 struct iscsi_internal {
72 struct scsi_transport_template t;
73 struct iscsi_transport *iscsi_transport;
74 struct list_head list;
77 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
78 struct transport_container conn_cont;
79 struct transport_container session_cont;
82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
83 static struct workqueue_struct *iscsi_eh_timer_workq;
86 * list of registered transports and lock that must
87 * be held while accessing list. The iscsi_transport_lock must
88 * be acquired after the rx_queue_mutex.
90 static LIST_HEAD(iscsi_transports);
91 static DEFINE_SPINLOCK(iscsi_transport_lock);
93 #define to_iscsi_internal(tmpl) \
94 container_of(tmpl, struct iscsi_internal, t)
96 #define dev_to_iscsi_internal(_dev) \
97 container_of(_dev, struct iscsi_internal, dev)
99 static void iscsi_transport_release(struct device *dev)
101 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
106 * iscsi_transport_class represents the iscsi_transports that are
109 static struct class iscsi_transport_class = {
110 .name = "iscsi_transport",
111 .dev_release = iscsi_transport_release,
115 show_transport_handle(struct device *dev, struct device_attribute *attr,
118 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
119 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
121 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
123 #define show_transport_attr(name, format) \
125 show_transport_##name(struct device *dev, \
126 struct device_attribute *attr,char *buf) \
128 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
129 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
131 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
133 show_transport_attr(caps, "0x%x");
135 static struct attribute *iscsi_transport_attrs[] = {
136 &dev_attr_handle.attr,
141 static struct attribute_group iscsi_transport_group = {
142 .attrs = iscsi_transport_attrs,
146 * iSCSI endpoint attrs
148 #define iscsi_dev_to_endpoint(_dev) \
149 container_of(_dev, struct iscsi_endpoint, dev)
151 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
152 struct device_attribute dev_attr_##_prefix##_##_name = \
153 __ATTR(_name,_mode,_show,_store)
155 static void iscsi_endpoint_release(struct device *dev)
157 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
161 static struct class iscsi_endpoint_class = {
162 .name = "iscsi_endpoint",
163 .dev_release = iscsi_endpoint_release,
167 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
169 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
170 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
172 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
174 static struct attribute *iscsi_endpoint_attrs[] = {
175 &dev_attr_ep_handle.attr,
179 static struct attribute_group iscsi_endpoint_group = {
180 .attrs = iscsi_endpoint_attrs,
183 #define ISCSI_MAX_EPID -1
185 static int iscsi_match_epid(struct device *dev, void *data)
187 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
188 uint64_t *epid = (uint64_t *) data;
190 return *epid == ep->id;
193 struct iscsi_endpoint *
194 iscsi_create_endpoint(int dd_size)
197 struct iscsi_endpoint *ep;
201 for (id = 1; id < ISCSI_MAX_EPID; id++) {
202 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
207 if (id == ISCSI_MAX_EPID) {
208 printk(KERN_ERR "Too many connections. Max supported %u\n",
213 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
218 ep->dev.class = &iscsi_endpoint_class;
219 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
220 err = device_register(&ep->dev);
224 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
229 ep->dd_data = &ep[1];
233 device_unregister(&ep->dev);
240 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
242 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
244 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
245 device_unregister(&ep->dev);
247 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
249 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
251 struct iscsi_endpoint *ep;
254 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
259 ep = iscsi_dev_to_endpoint(dev);
261 * we can drop this now because the interface will prevent
262 * removals and lookups from racing.
267 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
270 * Interface to display network param to sysfs
273 static void iscsi_iface_release(struct device *dev)
275 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
276 struct device *parent = iface->dev.parent;
283 static struct class iscsi_iface_class = {
284 .name = "iscsi_iface",
285 .dev_release = iscsi_iface_release,
288 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
289 struct device_attribute dev_attr_##_prefix##_##_name = \
290 __ATTR(_name, _mode, _show, _store)
292 /* iface attrs show */
293 #define iscsi_iface_attr_show(type, name, param_type, param) \
295 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
298 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
299 struct iscsi_transport *t = iface->transport; \
300 return t->get_iface_param(iface, param_type, param, buf); \
303 #define iscsi_iface_net_attr(type, name, param) \
304 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
305 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
307 /* generic read only ipvi4 attribute */
308 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
309 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
310 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
311 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
313 /* generic read only ipv6 attribute */
314 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
315 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
316 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
317 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
318 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
319 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
320 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
322 /* common read only iface attribute */
323 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
324 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
326 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
327 struct attribute *attr, int i)
329 struct device *dev = container_of(kobj, struct device, kobj);
330 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
331 struct iscsi_transport *t = iface->transport;
333 if (attr == &dev_attr_iface_enabled.attr)
334 return (t->iface_param_mask & ISCSI_NET_IFACE_ENABLE) ?
336 else if (attr == &dev_attr_iface_vlan.attr)
337 return (t->iface_param_mask & ISCSI_NET_VLAN_ID) ? S_IRUGO : 0;
339 if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
340 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
341 return (t->iface_param_mask & ISCSI_NET_IPV4_ADDR) ?
343 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
344 return (t->iface_param_mask & ISCSI_NET_IPV4_GW) ?
346 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
347 return (t->iface_param_mask & ISCSI_NET_IPV4_SUBNET) ?
349 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
350 return (t->iface_param_mask & ISCSI_NET_IPV4_BOOTPROTO) ?
352 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
353 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
354 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR) ?
356 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
357 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL) ?
359 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
360 return (t->iface_param_mask & ISCSI_NET_IPV6_ROUTER) ?
362 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
363 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR_AUTOCFG) ?
365 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
366 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL_AUTOCFG) ?
373 static struct attribute *iscsi_iface_attrs[] = {
374 &dev_attr_iface_enabled.attr,
375 &dev_attr_iface_vlan.attr,
376 &dev_attr_ipv4_iface_ipaddress.attr,
377 &dev_attr_ipv4_iface_gateway.attr,
378 &dev_attr_ipv4_iface_subnet.attr,
379 &dev_attr_ipv4_iface_bootproto.attr,
380 &dev_attr_ipv6_iface_ipaddress.attr,
381 &dev_attr_ipv6_iface_link_local_addr.attr,
382 &dev_attr_ipv6_iface_router_addr.attr,
383 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
384 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
388 static struct attribute_group iscsi_iface_group = {
389 .attrs = iscsi_iface_attrs,
390 .is_visible = iscsi_iface_attr_is_visible,
394 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
395 uint32_t iface_type, uint32_t iface_num, int dd_size)
397 struct iscsi_iface *iface;
400 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
404 iface->transport = transport;
405 iface->iface_type = iface_type;
406 iface->iface_num = iface_num;
407 iface->dev.release = iscsi_iface_release;
408 iface->dev.class = &iscsi_iface_class;
409 /* parent reference released in iscsi_iface_release */
410 iface->dev.parent = get_device(&shost->shost_gendev);
411 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
412 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
415 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
418 err = device_register(&iface->dev);
422 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
427 iface->dd_data = &iface[1];
431 device_unregister(&iface->dev);
435 put_device(iface->dev.parent);
439 EXPORT_SYMBOL_GPL(iscsi_create_iface);
441 void iscsi_destroy_iface(struct iscsi_iface *iface)
443 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
444 device_unregister(&iface->dev);
446 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
448 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
451 struct Scsi_Host *shost = dev_to_shost(dev);
452 struct iscsi_cls_host *ihost = shost->shost_data;
454 memset(ihost, 0, sizeof(*ihost));
455 atomic_set(&ihost->nr_scans, 0);
456 mutex_init(&ihost->mutex);
460 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
466 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
472 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
478 static struct sock *nls;
479 static DEFINE_MUTEX(rx_queue_mutex);
481 static LIST_HEAD(sesslist);
482 static DEFINE_SPINLOCK(sesslock);
483 static LIST_HEAD(connlist);
484 static DEFINE_SPINLOCK(connlock);
486 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
488 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
493 * Returns the matching session to a given sid
495 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
498 struct iscsi_cls_session *sess;
500 spin_lock_irqsave(&sesslock, flags);
501 list_for_each_entry(sess, &sesslist, sess_list) {
502 if (sess->sid == sid) {
503 spin_unlock_irqrestore(&sesslock, flags);
507 spin_unlock_irqrestore(&sesslock, flags);
512 * Returns the matching connection to a given sid / cid tuple
514 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
517 struct iscsi_cls_conn *conn;
519 spin_lock_irqsave(&connlock, flags);
520 list_for_each_entry(conn, &connlist, conn_list) {
521 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
522 spin_unlock_irqrestore(&connlock, flags);
526 spin_unlock_irqrestore(&connlock, flags);
531 * The following functions can be used by LLDs that allocate
532 * their own scsi_hosts or by software iscsi LLDs
537 } iscsi_session_state_names[] = {
538 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
539 { ISCSI_SESSION_FAILED, "FAILED" },
540 { ISCSI_SESSION_FREE, "FREE" },
543 static const char *iscsi_session_state_name(int state)
548 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
549 if (iscsi_session_state_names[i].value == state) {
550 name = iscsi_session_state_names[i].name;
557 int iscsi_session_chkready(struct iscsi_cls_session *session)
562 spin_lock_irqsave(&session->lock, flags);
563 switch (session->state) {
564 case ISCSI_SESSION_LOGGED_IN:
567 case ISCSI_SESSION_FAILED:
568 err = DID_IMM_RETRY << 16;
570 case ISCSI_SESSION_FREE:
571 err = DID_TRANSPORT_FAILFAST << 16;
574 err = DID_NO_CONNECT << 16;
577 spin_unlock_irqrestore(&session->lock, flags);
580 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
582 static void iscsi_session_release(struct device *dev)
584 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
585 struct Scsi_Host *shost;
587 shost = iscsi_session_to_shost(session);
588 scsi_host_put(shost);
589 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
593 static int iscsi_is_session_dev(const struct device *dev)
595 return dev->release == iscsi_session_release;
598 static int iscsi_iter_session_fn(struct device *dev, void *data)
600 void (* fn) (struct iscsi_cls_session *) = data;
602 if (!iscsi_is_session_dev(dev))
604 fn(iscsi_dev_to_session(dev));
608 void iscsi_host_for_each_session(struct Scsi_Host *shost,
609 void (*fn)(struct iscsi_cls_session *))
611 device_for_each_child(&shost->shost_gendev, fn,
612 iscsi_iter_session_fn);
614 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
617 * iscsi_scan_finished - helper to report when running scans are done
619 * @time: scan run time
621 * This function can be used by drives like qla4xxx to report to the scsi
622 * layer when the scans it kicked off at module load time are done.
624 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
626 struct iscsi_cls_host *ihost = shost->shost_data;
628 * qla4xxx will have kicked off some session unblocks before calling
629 * scsi_scan_host, so just wait for them to complete.
631 return !atomic_read(&ihost->nr_scans);
633 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
635 struct iscsi_scan_data {
636 unsigned int channel;
641 static int iscsi_user_scan_session(struct device *dev, void *data)
643 struct iscsi_scan_data *scan_data = data;
644 struct iscsi_cls_session *session;
645 struct Scsi_Host *shost;
646 struct iscsi_cls_host *ihost;
650 if (!iscsi_is_session_dev(dev))
653 session = iscsi_dev_to_session(dev);
655 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
657 shost = iscsi_session_to_shost(session);
658 ihost = shost->shost_data;
660 mutex_lock(&ihost->mutex);
661 spin_lock_irqsave(&session->lock, flags);
662 if (session->state != ISCSI_SESSION_LOGGED_IN) {
663 spin_unlock_irqrestore(&session->lock, flags);
666 id = session->target_id;
667 spin_unlock_irqrestore(&session->lock, flags);
669 if (id != ISCSI_MAX_TARGET) {
670 if ((scan_data->channel == SCAN_WILD_CARD ||
671 scan_data->channel == 0) &&
672 (scan_data->id == SCAN_WILD_CARD ||
673 scan_data->id == id))
674 scsi_scan_target(&session->dev, 0, id,
679 mutex_unlock(&ihost->mutex);
680 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
684 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
687 struct iscsi_scan_data scan_data;
689 scan_data.channel = channel;
693 return device_for_each_child(&shost->shost_gendev, &scan_data,
694 iscsi_user_scan_session);
697 static void iscsi_scan_session(struct work_struct *work)
699 struct iscsi_cls_session *session =
700 container_of(work, struct iscsi_cls_session, scan_work);
701 struct Scsi_Host *shost = iscsi_session_to_shost(session);
702 struct iscsi_cls_host *ihost = shost->shost_data;
703 struct iscsi_scan_data scan_data;
705 scan_data.channel = 0;
706 scan_data.id = SCAN_WILD_CARD;
707 scan_data.lun = SCAN_WILD_CARD;
709 iscsi_user_scan_session(&session->dev, &scan_data);
710 atomic_dec(&ihost->nr_scans);
714 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
715 * @cmd: scsi cmd passed to scsi eh handler
717 * If the session is down this function will wait for the recovery
718 * timer to fire or for the session to be logged back in. If the
719 * recovery timer fires then FAST_IO_FAIL is returned. The caller
720 * should pass this error value to the scsi eh.
722 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
724 struct iscsi_cls_session *session =
725 starget_to_session(scsi_target(cmd->device));
729 spin_lock_irqsave(&session->lock, flags);
730 while (session->state != ISCSI_SESSION_LOGGED_IN) {
731 if (session->state == ISCSI_SESSION_FREE) {
735 spin_unlock_irqrestore(&session->lock, flags);
737 spin_lock_irqsave(&session->lock, flags);
739 spin_unlock_irqrestore(&session->lock, flags);
742 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
744 static void session_recovery_timedout(struct work_struct *work)
746 struct iscsi_cls_session *session =
747 container_of(work, struct iscsi_cls_session,
751 iscsi_cls_session_printk(KERN_INFO, session,
752 "session recovery timed out after %d secs\n",
753 session->recovery_tmo);
755 spin_lock_irqsave(&session->lock, flags);
756 switch (session->state) {
757 case ISCSI_SESSION_FAILED:
758 session->state = ISCSI_SESSION_FREE;
760 case ISCSI_SESSION_LOGGED_IN:
761 case ISCSI_SESSION_FREE:
762 /* we raced with the unblock's flush */
763 spin_unlock_irqrestore(&session->lock, flags);
766 spin_unlock_irqrestore(&session->lock, flags);
768 if (session->transport->session_recovery_timedout)
769 session->transport->session_recovery_timedout(session);
771 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
772 scsi_target_unblock(&session->dev);
773 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
776 static void __iscsi_unblock_session(struct work_struct *work)
778 struct iscsi_cls_session *session =
779 container_of(work, struct iscsi_cls_session,
781 struct Scsi_Host *shost = iscsi_session_to_shost(session);
782 struct iscsi_cls_host *ihost = shost->shost_data;
785 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
787 * The recovery and unblock work get run from the same workqueue,
788 * so try to cancel it if it was going to run after this unblock.
790 cancel_delayed_work(&session->recovery_work);
791 spin_lock_irqsave(&session->lock, flags);
792 session->state = ISCSI_SESSION_LOGGED_IN;
793 spin_unlock_irqrestore(&session->lock, flags);
795 scsi_target_unblock(&session->dev);
797 * Only do kernel scanning if the driver is properly hooked into
798 * the async scanning code (drivers like iscsi_tcp do login and
799 * scanning from userspace).
801 if (shost->hostt->scan_finished) {
802 if (scsi_queue_work(shost, &session->scan_work))
803 atomic_inc(&ihost->nr_scans);
805 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
809 * iscsi_unblock_session - set a session as logged in and start IO.
810 * @session: iscsi session
812 * Mark a session as ready to accept IO.
814 void iscsi_unblock_session(struct iscsi_cls_session *session)
816 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
818 * make sure all the events have completed before tell the driver
821 flush_workqueue(iscsi_eh_timer_workq);
823 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
825 static void __iscsi_block_session(struct work_struct *work)
827 struct iscsi_cls_session *session =
828 container_of(work, struct iscsi_cls_session,
832 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
833 spin_lock_irqsave(&session->lock, flags);
834 session->state = ISCSI_SESSION_FAILED;
835 spin_unlock_irqrestore(&session->lock, flags);
836 scsi_target_block(&session->dev);
837 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
838 if (session->recovery_tmo >= 0)
839 queue_delayed_work(iscsi_eh_timer_workq,
840 &session->recovery_work,
841 session->recovery_tmo * HZ);
844 void iscsi_block_session(struct iscsi_cls_session *session)
846 queue_work(iscsi_eh_timer_workq, &session->block_work);
848 EXPORT_SYMBOL_GPL(iscsi_block_session);
850 static void __iscsi_unbind_session(struct work_struct *work)
852 struct iscsi_cls_session *session =
853 container_of(work, struct iscsi_cls_session,
855 struct Scsi_Host *shost = iscsi_session_to_shost(session);
856 struct iscsi_cls_host *ihost = shost->shost_data;
859 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
861 /* Prevent new scans and make sure scanning is not in progress */
862 mutex_lock(&ihost->mutex);
863 spin_lock_irqsave(&session->lock, flags);
864 if (session->target_id == ISCSI_MAX_TARGET) {
865 spin_unlock_irqrestore(&session->lock, flags);
866 mutex_unlock(&ihost->mutex);
869 session->target_id = ISCSI_MAX_TARGET;
870 spin_unlock_irqrestore(&session->lock, flags);
871 mutex_unlock(&ihost->mutex);
873 scsi_remove_target(&session->dev);
874 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
875 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
878 struct iscsi_cls_session *
879 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
882 struct iscsi_cls_session *session;
884 session = kzalloc(sizeof(*session) + dd_size,
889 session->transport = transport;
890 session->recovery_tmo = 120;
891 session->state = ISCSI_SESSION_FREE;
892 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
893 INIT_LIST_HEAD(&session->sess_list);
894 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
895 INIT_WORK(&session->block_work, __iscsi_block_session);
896 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
897 INIT_WORK(&session->scan_work, iscsi_scan_session);
898 spin_lock_init(&session->lock);
900 /* this is released in the dev's release function */
901 scsi_host_get(shost);
902 session->dev.parent = &shost->shost_gendev;
903 session->dev.release = iscsi_session_release;
904 device_initialize(&session->dev);
906 session->dd_data = &session[1];
908 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
911 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
913 static int iscsi_get_next_target_id(struct device *dev, void *data)
915 struct iscsi_cls_session *session;
919 if (!iscsi_is_session_dev(dev))
922 session = iscsi_dev_to_session(dev);
923 spin_lock_irqsave(&session->lock, flags);
924 if (*((unsigned int *) data) == session->target_id)
926 spin_unlock_irqrestore(&session->lock, flags);
930 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
932 struct Scsi_Host *shost = iscsi_session_to_shost(session);
933 struct iscsi_cls_host *ihost;
935 unsigned int id = target_id;
938 ihost = shost->shost_data;
939 session->sid = atomic_add_return(1, &iscsi_session_nr);
941 if (id == ISCSI_MAX_TARGET) {
942 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
943 err = device_for_each_child(&shost->shost_gendev, &id,
944 iscsi_get_next_target_id);
949 if (id == ISCSI_MAX_TARGET) {
950 iscsi_cls_session_printk(KERN_ERR, session,
951 "Too many iscsi targets. Max "
952 "number of targets is %d.\n",
953 ISCSI_MAX_TARGET - 1);
958 session->target_id = id;
960 dev_set_name(&session->dev, "session%u", session->sid);
961 err = device_add(&session->dev);
963 iscsi_cls_session_printk(KERN_ERR, session,
964 "could not register session's dev\n");
967 transport_register_device(&session->dev);
969 spin_lock_irqsave(&sesslock, flags);
970 list_add(&session->sess_list, &sesslist);
971 spin_unlock_irqrestore(&sesslock, flags);
973 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
974 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
978 scsi_host_put(shost);
981 EXPORT_SYMBOL_GPL(iscsi_add_session);
984 * iscsi_create_session - create iscsi class session
986 * @transport: iscsi transport
987 * @dd_size: private driver data size
988 * @target_id: which target
990 * This can be called from a LLD or iscsi_transport.
992 struct iscsi_cls_session *
993 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
994 int dd_size, unsigned int target_id)
996 struct iscsi_cls_session *session;
998 session = iscsi_alloc_session(shost, transport, dd_size);
1002 if (iscsi_add_session(session, target_id)) {
1003 iscsi_free_session(session);
1008 EXPORT_SYMBOL_GPL(iscsi_create_session);
1010 static void iscsi_conn_release(struct device *dev)
1012 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1013 struct device *parent = conn->dev.parent;
1015 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1020 static int iscsi_is_conn_dev(const struct device *dev)
1022 return dev->release == iscsi_conn_release;
1025 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1027 if (!iscsi_is_conn_dev(dev))
1029 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1032 void iscsi_remove_session(struct iscsi_cls_session *session)
1034 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1035 unsigned long flags;
1038 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1040 spin_lock_irqsave(&sesslock, flags);
1041 list_del(&session->sess_list);
1042 spin_unlock_irqrestore(&sesslock, flags);
1044 /* make sure there are no blocks/unblocks queued */
1045 flush_workqueue(iscsi_eh_timer_workq);
1046 /* make sure the timedout callout is not running */
1047 if (!cancel_delayed_work(&session->recovery_work))
1048 flush_workqueue(iscsi_eh_timer_workq);
1050 * If we are blocked let commands flow again. The lld or iscsi
1051 * layer should set up the queuecommand to fail commands.
1052 * We assume that LLD will not be calling block/unblock while
1053 * removing the session.
1055 spin_lock_irqsave(&session->lock, flags);
1056 session->state = ISCSI_SESSION_FREE;
1057 spin_unlock_irqrestore(&session->lock, flags);
1059 scsi_target_unblock(&session->dev);
1060 /* flush running scans then delete devices */
1061 scsi_flush_work(shost);
1062 __iscsi_unbind_session(&session->unbind_work);
1064 /* hw iscsi may not have removed all connections from session */
1065 err = device_for_each_child(&session->dev, NULL,
1066 iscsi_iter_destroy_conn_fn);
1068 iscsi_cls_session_printk(KERN_ERR, session,
1069 "Could not delete all connections "
1070 "for session. Error %d.\n", err);
1072 transport_unregister_device(&session->dev);
1074 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1075 device_del(&session->dev);
1077 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1079 void iscsi_free_session(struct iscsi_cls_session *session)
1081 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1082 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1083 put_device(&session->dev);
1085 EXPORT_SYMBOL_GPL(iscsi_free_session);
1088 * iscsi_destroy_session - destroy iscsi session
1089 * @session: iscsi_session
1091 * Can be called by a LLD or iscsi_transport. There must not be
1092 * any running connections.
1094 int iscsi_destroy_session(struct iscsi_cls_session *session)
1096 iscsi_remove_session(session);
1097 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1098 iscsi_free_session(session);
1101 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1104 * iscsi_create_conn - create iscsi class connection
1105 * @session: iscsi cls session
1106 * @dd_size: private driver data size
1107 * @cid: connection id
1109 * This can be called from a LLD or iscsi_transport. The connection
1110 * is child of the session so cid must be unique for all connections
1113 * Since we do not support MCS, cid will normally be zero. In some cases
1114 * for software iscsi we could be trying to preallocate a connection struct
1115 * in which case there could be two connection structs and cid would be
1118 struct iscsi_cls_conn *
1119 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1121 struct iscsi_transport *transport = session->transport;
1122 struct iscsi_cls_conn *conn;
1123 unsigned long flags;
1126 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1130 conn->dd_data = &conn[1];
1132 mutex_init(&conn->ep_mutex);
1133 INIT_LIST_HEAD(&conn->conn_list);
1134 conn->transport = transport;
1137 /* this is released in the dev's release function */
1138 if (!get_device(&session->dev))
1141 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1142 conn->dev.parent = &session->dev;
1143 conn->dev.release = iscsi_conn_release;
1144 err = device_register(&conn->dev);
1146 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1147 "register connection's dev\n");
1148 goto release_parent_ref;
1150 transport_register_device(&conn->dev);
1152 spin_lock_irqsave(&connlock, flags);
1153 list_add(&conn->conn_list, &connlist);
1154 spin_unlock_irqrestore(&connlock, flags);
1156 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1160 put_device(&session->dev);
1166 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1169 * iscsi_destroy_conn - destroy iscsi class connection
1170 * @conn: iscsi cls session
1172 * This can be called from a LLD or iscsi_transport.
1174 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1176 unsigned long flags;
1178 spin_lock_irqsave(&connlock, flags);
1179 list_del(&conn->conn_list);
1180 spin_unlock_irqrestore(&connlock, flags);
1182 transport_unregister_device(&conn->dev);
1183 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1184 device_unregister(&conn->dev);
1187 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1190 * iscsi interface functions
1192 static struct iscsi_internal *
1193 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1195 struct iscsi_internal *priv;
1196 unsigned long flags;
1198 spin_lock_irqsave(&iscsi_transport_lock, flags);
1199 list_for_each_entry(priv, &iscsi_transports, list) {
1200 if (tt == priv->iscsi_transport) {
1201 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1205 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1210 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1212 return nlmsg_multicast(nls, skb, 0, group, gfp);
1215 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1216 char *data, uint32_t data_size)
1218 struct nlmsghdr *nlh;
1219 struct sk_buff *skb;
1220 struct iscsi_uevent *ev;
1222 struct iscsi_internal *priv;
1223 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1226 priv = iscsi_if_transport_lookup(conn->transport);
1230 skb = alloc_skb(len, GFP_ATOMIC);
1232 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1233 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1234 "control PDU: OOM\n");
1238 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1239 ev = NLMSG_DATA(nlh);
1240 memset(ev, 0, sizeof(*ev));
1241 ev->transport_handle = iscsi_handle(conn->transport);
1242 ev->type = ISCSI_KEVENT_RECV_PDU;
1243 ev->r.recv_req.cid = conn->cid;
1244 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1245 pdu = (char*)ev + sizeof(*ev);
1246 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1247 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1249 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1251 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1253 int iscsi_offload_mesg(struct Scsi_Host *shost,
1254 struct iscsi_transport *transport, uint32_t type,
1255 char *data, uint16_t data_size)
1257 struct nlmsghdr *nlh;
1258 struct sk_buff *skb;
1259 struct iscsi_uevent *ev;
1260 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1262 skb = alloc_skb(len, GFP_ATOMIC);
1264 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1268 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1269 ev = NLMSG_DATA(nlh);
1270 memset(ev, 0, sizeof(*ev));
1272 ev->transport_handle = iscsi_handle(transport);
1274 case ISCSI_KEVENT_PATH_REQ:
1275 ev->r.req_path.host_no = shost->host_no;
1277 case ISCSI_KEVENT_IF_DOWN:
1278 ev->r.notify_if_down.host_no = shost->host_no;
1282 memcpy((char *)ev + sizeof(*ev), data, data_size);
1284 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1286 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1288 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1290 struct nlmsghdr *nlh;
1291 struct sk_buff *skb;
1292 struct iscsi_uevent *ev;
1293 struct iscsi_internal *priv;
1294 int len = NLMSG_SPACE(sizeof(*ev));
1296 priv = iscsi_if_transport_lookup(conn->transport);
1300 skb = alloc_skb(len, GFP_ATOMIC);
1302 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1303 "conn error (%d)\n", error);
1307 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1308 ev = NLMSG_DATA(nlh);
1309 ev->transport_handle = iscsi_handle(conn->transport);
1310 ev->type = ISCSI_KEVENT_CONN_ERROR;
1311 ev->r.connerror.error = error;
1312 ev->r.connerror.cid = conn->cid;
1313 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1315 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1317 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1320 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1323 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1324 void *payload, int size)
1326 struct sk_buff *skb;
1327 struct nlmsghdr *nlh;
1328 int len = NLMSG_SPACE(size);
1329 int flags = multi ? NLM_F_MULTI : 0;
1330 int t = done ? NLMSG_DONE : type;
1332 skb = alloc_skb(len, GFP_ATOMIC);
1334 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1338 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1339 nlh->nlmsg_flags = flags;
1340 memcpy(NLMSG_DATA(nlh), payload, size);
1341 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1345 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1347 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1348 struct iscsi_stats *stats;
1349 struct sk_buff *skbstat;
1350 struct iscsi_cls_conn *conn;
1351 struct nlmsghdr *nlhstat;
1352 struct iscsi_uevent *evstat;
1353 struct iscsi_internal *priv;
1354 int len = NLMSG_SPACE(sizeof(*ev) +
1355 sizeof(struct iscsi_stats) +
1356 sizeof(struct iscsi_stats_custom) *
1357 ISCSI_STATS_CUSTOM_MAX);
1360 priv = iscsi_if_transport_lookup(transport);
1364 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1371 skbstat = alloc_skb(len, GFP_ATOMIC);
1373 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1374 "deliver stats: OOM\n");
1378 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1379 (len - sizeof(*nlhstat)), 0);
1380 evstat = NLMSG_DATA(nlhstat);
1381 memset(evstat, 0, sizeof(*evstat));
1382 evstat->transport_handle = iscsi_handle(conn->transport);
1383 evstat->type = nlh->nlmsg_type;
1384 evstat->u.get_stats.cid =
1385 ev->u.get_stats.cid;
1386 evstat->u.get_stats.sid =
1387 ev->u.get_stats.sid;
1388 stats = (struct iscsi_stats *)
1389 ((char*)evstat + sizeof(*evstat));
1390 memset(stats, 0, sizeof(*stats));
1392 transport->get_stats(conn, stats);
1393 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1394 sizeof(struct iscsi_stats) +
1395 sizeof(struct iscsi_stats_custom) *
1396 stats->custom_length);
1397 actual_size -= sizeof(*nlhstat);
1398 actual_size = NLMSG_LENGTH(actual_size);
1399 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1400 nlhstat->nlmsg_len = actual_size;
1402 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1404 } while (err < 0 && err != -ECONNREFUSED);
1410 * iscsi_session_event - send session destr. completion event
1411 * @session: iscsi class session
1412 * @event: type of event
1414 int iscsi_session_event(struct iscsi_cls_session *session,
1415 enum iscsi_uevent_e event)
1417 struct iscsi_internal *priv;
1418 struct Scsi_Host *shost;
1419 struct iscsi_uevent *ev;
1420 struct sk_buff *skb;
1421 struct nlmsghdr *nlh;
1422 int rc, len = NLMSG_SPACE(sizeof(*ev));
1424 priv = iscsi_if_transport_lookup(session->transport);
1427 shost = iscsi_session_to_shost(session);
1429 skb = alloc_skb(len, GFP_KERNEL);
1431 iscsi_cls_session_printk(KERN_ERR, session,
1432 "Cannot notify userspace of session "
1433 "event %u\n", event);
1437 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1438 ev = NLMSG_DATA(nlh);
1439 ev->transport_handle = iscsi_handle(session->transport);
1443 case ISCSI_KEVENT_DESTROY_SESSION:
1444 ev->r.d_session.host_no = shost->host_no;
1445 ev->r.d_session.sid = session->sid;
1447 case ISCSI_KEVENT_CREATE_SESSION:
1448 ev->r.c_session_ret.host_no = shost->host_no;
1449 ev->r.c_session_ret.sid = session->sid;
1451 case ISCSI_KEVENT_UNBIND_SESSION:
1452 ev->r.unbind_session.host_no = shost->host_no;
1453 ev->r.unbind_session.sid = session->sid;
1456 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1463 * this will occur if the daemon is not up, so we just warn
1464 * the user and when the daemon is restarted it will handle it
1466 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1468 iscsi_cls_session_printk(KERN_ERR, session,
1469 "Cannot notify userspace of session "
1470 "event %u. Check iscsi daemon\n",
1473 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1477 EXPORT_SYMBOL_GPL(iscsi_session_event);
1480 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1481 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1482 uint16_t cmds_max, uint16_t queue_depth)
1484 struct iscsi_transport *transport = priv->iscsi_transport;
1485 struct iscsi_cls_session *session;
1486 struct Scsi_Host *shost;
1488 session = transport->create_session(ep, cmds_max, queue_depth,
1493 shost = iscsi_session_to_shost(session);
1494 ev->r.c_session_ret.host_no = shost->host_no;
1495 ev->r.c_session_ret.sid = session->sid;
1496 ISCSI_DBG_TRANS_SESSION(session,
1497 "Completed creating transport session\n");
1502 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1504 struct iscsi_cls_conn *conn;
1505 struct iscsi_cls_session *session;
1507 session = iscsi_session_lookup(ev->u.c_conn.sid);
1509 printk(KERN_ERR "iscsi: invalid session %d.\n",
1514 conn = transport->create_conn(session, ev->u.c_conn.cid);
1516 iscsi_cls_session_printk(KERN_ERR, session,
1517 "couldn't create a new connection.");
1521 ev->r.c_conn_ret.sid = session->sid;
1522 ev->r.c_conn_ret.cid = conn->cid;
1524 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1529 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1531 struct iscsi_cls_conn *conn;
1533 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1537 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1538 if (transport->destroy_conn)
1539 transport->destroy_conn(conn);
1545 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1547 char *data = (char*)ev + sizeof(*ev);
1548 struct iscsi_cls_conn *conn;
1549 struct iscsi_cls_session *session;
1550 int err = 0, value = 0;
1552 session = iscsi_session_lookup(ev->u.set_param.sid);
1553 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1554 if (!conn || !session)
1557 switch (ev->u.set_param.param) {
1558 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1559 sscanf(data, "%d", &value);
1560 session->recovery_tmo = value;
1563 err = transport->set_param(conn, ev->u.set_param.param,
1564 data, ev->u.set_param.len);
1570 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1571 struct iscsi_uevent *ev, int msg_type)
1573 struct iscsi_endpoint *ep;
1574 struct sockaddr *dst_addr;
1575 struct Scsi_Host *shost = NULL;
1576 int non_blocking, err = 0;
1578 if (!transport->ep_connect)
1581 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1582 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1584 printk(KERN_ERR "ep connect failed. Could not find "
1586 ev->u.ep_connect_through_host.host_no);
1589 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1591 non_blocking = ev->u.ep_connect.non_blocking;
1593 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1594 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1600 ev->r.ep_connect_ret.handle = ep->id;
1603 scsi_host_put(shost);
1607 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1610 struct iscsi_cls_conn *conn;
1611 struct iscsi_endpoint *ep;
1613 if (!transport->ep_disconnect)
1616 ep = iscsi_lookup_endpoint(ep_handle);
1621 mutex_lock(&conn->ep_mutex);
1623 mutex_unlock(&conn->ep_mutex);
1626 transport->ep_disconnect(ep);
1631 iscsi_if_transport_ep(struct iscsi_transport *transport,
1632 struct iscsi_uevent *ev, int msg_type)
1634 struct iscsi_endpoint *ep;
1638 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1639 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1640 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1642 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1643 if (!transport->ep_poll)
1646 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1650 ev->r.retcode = transport->ep_poll(ep,
1651 ev->u.ep_poll.timeout_ms);
1653 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1654 rc = iscsi_if_ep_disconnect(transport,
1655 ev->u.ep_disconnect.ep_handle);
1662 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1663 struct iscsi_uevent *ev)
1665 struct Scsi_Host *shost;
1666 struct sockaddr *dst_addr;
1669 if (!transport->tgt_dscvr)
1672 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1674 printk(KERN_ERR "target discovery could not find host no %u\n",
1675 ev->u.tgt_dscvr.host_no);
1680 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1681 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1682 ev->u.tgt_dscvr.enable, dst_addr);
1683 scsi_host_put(shost);
1688 iscsi_set_host_param(struct iscsi_transport *transport,
1689 struct iscsi_uevent *ev)
1691 char *data = (char*)ev + sizeof(*ev);
1692 struct Scsi_Host *shost;
1695 if (!transport->set_host_param)
1698 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1700 printk(KERN_ERR "set_host_param could not find host no %u\n",
1701 ev->u.set_host_param.host_no);
1705 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1706 data, ev->u.set_host_param.len);
1707 scsi_host_put(shost);
1712 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1714 struct Scsi_Host *shost;
1715 struct iscsi_path *params;
1718 if (!transport->set_path)
1721 shost = scsi_host_lookup(ev->u.set_path.host_no);
1723 printk(KERN_ERR "set path could not find host no %u\n",
1724 ev->u.set_path.host_no);
1728 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1729 err = transport->set_path(shost, params);
1731 scsi_host_put(shost);
1736 iscsi_set_iface_params(struct iscsi_transport *transport,
1737 struct iscsi_uevent *ev)
1739 char *data = (char *)ev + sizeof(*ev);
1740 struct Scsi_Host *shost;
1743 if (!transport->set_iface_param)
1746 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1748 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1749 ev->u.set_iface_params.host_no);
1753 err = transport->set_iface_param(shost, data,
1754 ev->u.set_iface_params.count);
1755 scsi_host_put(shost);
1760 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1763 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1764 struct iscsi_transport *transport = NULL;
1765 struct iscsi_internal *priv;
1766 struct iscsi_cls_session *session;
1767 struct iscsi_cls_conn *conn;
1768 struct iscsi_endpoint *ep = NULL;
1770 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1771 *group = ISCSI_NL_GRP_UIP;
1773 *group = ISCSI_NL_GRP_ISCSID;
1775 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1778 transport = priv->iscsi_transport;
1780 if (!try_module_get(transport->owner))
1783 switch (nlh->nlmsg_type) {
1784 case ISCSI_UEVENT_CREATE_SESSION:
1785 err = iscsi_if_create_session(priv, ep, ev,
1786 ev->u.c_session.initial_cmdsn,
1787 ev->u.c_session.cmds_max,
1788 ev->u.c_session.queue_depth);
1790 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1791 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1797 err = iscsi_if_create_session(priv, ep, ev,
1798 ev->u.c_bound_session.initial_cmdsn,
1799 ev->u.c_bound_session.cmds_max,
1800 ev->u.c_bound_session.queue_depth);
1802 case ISCSI_UEVENT_DESTROY_SESSION:
1803 session = iscsi_session_lookup(ev->u.d_session.sid);
1805 transport->destroy_session(session);
1809 case ISCSI_UEVENT_UNBIND_SESSION:
1810 session = iscsi_session_lookup(ev->u.d_session.sid);
1812 scsi_queue_work(iscsi_session_to_shost(session),
1813 &session->unbind_work);
1817 case ISCSI_UEVENT_CREATE_CONN:
1818 err = iscsi_if_create_conn(transport, ev);
1820 case ISCSI_UEVENT_DESTROY_CONN:
1821 err = iscsi_if_destroy_conn(transport, ev);
1823 case ISCSI_UEVENT_BIND_CONN:
1824 session = iscsi_session_lookup(ev->u.b_conn.sid);
1825 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1827 if (conn && conn->ep)
1828 iscsi_if_ep_disconnect(transport, conn->ep->id);
1830 if (!session || !conn) {
1835 ev->r.retcode = transport->bind_conn(session, conn,
1836 ev->u.b_conn.transport_eph,
1837 ev->u.b_conn.is_leading);
1838 if (ev->r.retcode || !transport->ep_connect)
1841 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1845 mutex_lock(&conn->ep_mutex);
1847 mutex_unlock(&conn->ep_mutex);
1849 iscsi_cls_conn_printk(KERN_ERR, conn,
1850 "Could not set ep conn "
1853 case ISCSI_UEVENT_SET_PARAM:
1854 err = iscsi_set_param(transport, ev);
1856 case ISCSI_UEVENT_START_CONN:
1857 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1859 ev->r.retcode = transport->start_conn(conn);
1863 case ISCSI_UEVENT_STOP_CONN:
1864 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1866 transport->stop_conn(conn, ev->u.stop_conn.flag);
1870 case ISCSI_UEVENT_SEND_PDU:
1871 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1873 ev->r.retcode = transport->send_pdu(conn,
1874 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1875 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1876 ev->u.send_pdu.data_size);
1880 case ISCSI_UEVENT_GET_STATS:
1881 err = iscsi_if_get_stats(transport, nlh);
1883 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1884 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1885 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1886 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1887 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1889 case ISCSI_UEVENT_TGT_DSCVR:
1890 err = iscsi_tgt_dscvr(transport, ev);
1892 case ISCSI_UEVENT_SET_HOST_PARAM:
1893 err = iscsi_set_host_param(transport, ev);
1895 case ISCSI_UEVENT_PATH_UPDATE:
1896 err = iscsi_set_path(transport, ev);
1898 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1899 err = iscsi_set_iface_params(transport, ev);
1906 module_put(transport->owner);
1911 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1912 * Malformed skbs with wrong lengths or invalid creds are not processed.
1915 iscsi_if_rx(struct sk_buff *skb)
1917 mutex_lock(&rx_queue_mutex);
1918 while (skb->len >= NLMSG_SPACE(0)) {
1921 struct nlmsghdr *nlh;
1922 struct iscsi_uevent *ev;
1925 nlh = nlmsg_hdr(skb);
1926 if (nlh->nlmsg_len < sizeof(*nlh) ||
1927 skb->len < nlh->nlmsg_len) {
1931 ev = NLMSG_DATA(nlh);
1932 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1933 if (rlen > skb->len)
1936 err = iscsi_if_recv_msg(skb, nlh, &group);
1938 ev->type = ISCSI_KEVENT_IF_ERROR;
1943 * special case for GET_STATS:
1944 * on success - sending reply and stats from
1945 * inside of if_recv_msg(),
1946 * on error - fall through.
1948 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1950 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1951 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1952 } while (err < 0 && err != -ECONNREFUSED);
1953 skb_pull(skb, rlen);
1955 mutex_unlock(&rx_queue_mutex);
1958 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1959 struct device_attribute dev_attr_##_prefix##_##_name = \
1960 __ATTR(_name,_mode,_show,_store)
1963 * iSCSI connection attrs
1965 #define iscsi_conn_attr_show(param) \
1967 show_conn_param_##param(struct device *dev, \
1968 struct device_attribute *attr, char *buf) \
1970 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1971 struct iscsi_transport *t = conn->transport; \
1972 return t->get_conn_param(conn, param, buf); \
1975 #define iscsi_conn_attr(field, param) \
1976 iscsi_conn_attr_show(param) \
1977 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1980 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1981 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1982 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1983 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1984 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1985 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1986 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1987 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1988 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1989 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1990 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1992 #define iscsi_conn_ep_attr_show(param) \
1993 static ssize_t show_conn_ep_param_##param(struct device *dev, \
1994 struct device_attribute *attr,\
1997 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1998 struct iscsi_transport *t = conn->transport; \
1999 struct iscsi_endpoint *ep; \
2003 * Need to make sure ep_disconnect does not free the LLD's \
2004 * interconnect resources while we are trying to read them. \
2006 mutex_lock(&conn->ep_mutex); \
2008 if (!ep && t->ep_connect) { \
2009 mutex_unlock(&conn->ep_mutex); \
2014 rc = t->get_ep_param(ep, param, buf); \
2016 rc = t->get_conn_param(conn, param, buf); \
2017 mutex_unlock(&conn->ep_mutex); \
2021 #define iscsi_conn_ep_attr(field, param) \
2022 iscsi_conn_ep_attr_show(param) \
2023 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2024 show_conn_ep_param_##param, NULL);
2026 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2027 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2029 static struct attribute *iscsi_conn_attrs[] = {
2030 &dev_attr_conn_max_recv_dlength.attr,
2031 &dev_attr_conn_max_xmit_dlength.attr,
2032 &dev_attr_conn_header_digest.attr,
2033 &dev_attr_conn_data_digest.attr,
2034 &dev_attr_conn_ifmarker.attr,
2035 &dev_attr_conn_ofmarker.attr,
2036 &dev_attr_conn_address.attr,
2037 &dev_attr_conn_port.attr,
2038 &dev_attr_conn_exp_statsn.attr,
2039 &dev_attr_conn_persistent_address.attr,
2040 &dev_attr_conn_persistent_port.attr,
2041 &dev_attr_conn_ping_tmo.attr,
2042 &dev_attr_conn_recv_tmo.attr,
2046 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2047 struct attribute *attr, int i)
2049 struct device *cdev = container_of(kobj, struct device, kobj);
2050 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2051 struct iscsi_transport *t = conn->transport;
2054 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2055 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2056 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2057 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2058 else if (attr == &dev_attr_conn_header_digest.attr)
2059 param = ISCSI_PARAM_HDRDGST_EN;
2060 else if (attr == &dev_attr_conn_data_digest.attr)
2061 param = ISCSI_PARAM_DATADGST_EN;
2062 else if (attr == &dev_attr_conn_ifmarker.attr)
2063 param = ISCSI_PARAM_IFMARKER_EN;
2064 else if (attr == &dev_attr_conn_ofmarker.attr)
2065 param = ISCSI_PARAM_OFMARKER_EN;
2066 else if (attr == &dev_attr_conn_address.attr)
2067 param = ISCSI_PARAM_CONN_ADDRESS;
2068 else if (attr == &dev_attr_conn_port.attr)
2069 param = ISCSI_PARAM_CONN_PORT;
2070 else if (attr == &dev_attr_conn_exp_statsn.attr)
2071 param = ISCSI_PARAM_EXP_STATSN;
2072 else if (attr == &dev_attr_conn_persistent_address.attr)
2073 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2074 else if (attr == &dev_attr_conn_persistent_port.attr)
2075 param = ISCSI_PARAM_PERSISTENT_PORT;
2076 else if (attr == &dev_attr_conn_ping_tmo.attr)
2077 param = ISCSI_PARAM_PING_TMO;
2078 else if (attr == &dev_attr_conn_recv_tmo.attr)
2079 param = ISCSI_PARAM_RECV_TMO;
2081 WARN_ONCE(1, "Invalid conn attr");
2085 return t->attr_is_visible(ISCSI_PARAM, param);
2088 static struct attribute_group iscsi_conn_group = {
2089 .attrs = iscsi_conn_attrs,
2090 .is_visible = iscsi_conn_attr_is_visible,
2094 * iSCSI session attrs
2096 #define iscsi_session_attr_show(param, perm) \
2098 show_session_param_##param(struct device *dev, \
2099 struct device_attribute *attr, char *buf) \
2101 struct iscsi_cls_session *session = \
2102 iscsi_dev_to_session(dev->parent); \
2103 struct iscsi_transport *t = session->transport; \
2105 if (perm && !capable(CAP_SYS_ADMIN)) \
2107 return t->get_session_param(session, param, buf); \
2110 #define iscsi_session_attr(field, param, perm) \
2111 iscsi_session_attr_show(param, perm) \
2112 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2114 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2115 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2116 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2117 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2118 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2119 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2120 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2121 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2122 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2123 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2124 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2125 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2126 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2127 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2128 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2129 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2130 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2131 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2132 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2133 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2134 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2137 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2140 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2141 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2143 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2146 #define iscsi_priv_session_attr_show(field, format) \
2148 show_priv_session_##field(struct device *dev, \
2149 struct device_attribute *attr, char *buf) \
2151 struct iscsi_cls_session *session = \
2152 iscsi_dev_to_session(dev->parent); \
2153 if (session->field == -1) \
2154 return sprintf(buf, "off\n"); \
2155 return sprintf(buf, format"\n", session->field); \
2158 #define iscsi_priv_session_attr_store(field) \
2160 store_priv_session_##field(struct device *dev, \
2161 struct device_attribute *attr, \
2162 const char *buf, size_t count) \
2166 struct iscsi_cls_session *session = \
2167 iscsi_dev_to_session(dev->parent); \
2168 if ((session->state == ISCSI_SESSION_FREE) || \
2169 (session->state == ISCSI_SESSION_FAILED)) \
2171 if (strncmp(buf, "off", 3) == 0) \
2172 session->field = -1; \
2174 val = simple_strtoul(buf, &cp, 0); \
2175 if (*cp != '\0' && *cp != '\n') \
2177 session->field = val; \
2182 #define iscsi_priv_session_rw_attr(field, format) \
2183 iscsi_priv_session_attr_show(field, format) \
2184 iscsi_priv_session_attr_store(field) \
2185 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
2186 show_priv_session_##field, \
2187 store_priv_session_##field)
2188 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2190 static struct attribute *iscsi_session_attrs[] = {
2191 &dev_attr_sess_initial_r2t.attr,
2192 &dev_attr_sess_max_outstanding_r2t.attr,
2193 &dev_attr_sess_immediate_data.attr,
2194 &dev_attr_sess_first_burst_len.attr,
2195 &dev_attr_sess_max_burst_len.attr,
2196 &dev_attr_sess_data_pdu_in_order.attr,
2197 &dev_attr_sess_data_seq_in_order.attr,
2198 &dev_attr_sess_erl.attr,
2199 &dev_attr_sess_targetname.attr,
2200 &dev_attr_sess_tpgt.attr,
2201 &dev_attr_sess_password.attr,
2202 &dev_attr_sess_password_in.attr,
2203 &dev_attr_sess_username.attr,
2204 &dev_attr_sess_username_in.attr,
2205 &dev_attr_sess_fast_abort.attr,
2206 &dev_attr_sess_abort_tmo.attr,
2207 &dev_attr_sess_lu_reset_tmo.attr,
2208 &dev_attr_sess_tgt_reset_tmo.attr,
2209 &dev_attr_sess_ifacename.attr,
2210 &dev_attr_sess_initiatorname.attr,
2211 &dev_attr_sess_targetalias.attr,
2212 &dev_attr_priv_sess_recovery_tmo.attr,
2213 &dev_attr_priv_sess_state.attr,
2217 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2218 struct attribute *attr, int i)
2220 struct device *cdev = container_of(kobj, struct device, kobj);
2221 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2222 struct iscsi_transport *t = session->transport;
2225 if (attr == &dev_attr_sess_initial_r2t.attr)
2226 param = ISCSI_PARAM_INITIAL_R2T_EN;
2227 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2228 param = ISCSI_PARAM_MAX_R2T;
2229 else if (attr == &dev_attr_sess_immediate_data.attr)
2230 param = ISCSI_PARAM_IMM_DATA_EN;
2231 else if (attr == &dev_attr_sess_first_burst_len.attr)
2232 param = ISCSI_PARAM_FIRST_BURST;
2233 else if (attr == &dev_attr_sess_max_burst_len.attr)
2234 param = ISCSI_PARAM_MAX_BURST;
2235 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2236 param = ISCSI_PARAM_PDU_INORDER_EN;
2237 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2238 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2239 else if (attr == &dev_attr_sess_erl.attr)
2240 param = ISCSI_PARAM_ERL;
2241 else if (attr == &dev_attr_sess_targetname.attr)
2242 param = ISCSI_PARAM_TARGET_NAME;
2243 else if (attr == &dev_attr_sess_tpgt.attr)
2244 param = ISCSI_PARAM_TPGT;
2245 else if (attr == &dev_attr_sess_password.attr)
2246 param = ISCSI_PARAM_USERNAME;
2247 else if (attr == &dev_attr_sess_password_in.attr)
2248 param = ISCSI_PARAM_USERNAME_IN;
2249 else if (attr == &dev_attr_sess_username.attr)
2250 param = ISCSI_PARAM_PASSWORD;
2251 else if (attr == &dev_attr_sess_username_in.attr)
2252 param = ISCSI_PARAM_PASSWORD_IN;
2253 else if (attr == &dev_attr_sess_fast_abort.attr)
2254 param = ISCSI_PARAM_FAST_ABORT;
2255 else if (attr == &dev_attr_sess_abort_tmo.attr)
2256 param = ISCSI_PARAM_ABORT_TMO;
2257 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2258 param = ISCSI_PARAM_LU_RESET_TMO;
2259 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2260 param = ISCSI_PARAM_TGT_RESET_TMO;
2261 else if (attr == &dev_attr_sess_ifacename.attr)
2262 param = ISCSI_PARAM_IFACE_NAME;
2263 else if (attr == &dev_attr_sess_initiatorname.attr)
2264 param = ISCSI_PARAM_INITIATOR_NAME;
2265 else if (attr == &dev_attr_sess_targetalias.attr)
2266 param = ISCSI_PARAM_TARGET_ALIAS;
2267 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2268 return S_IRUGO | S_IWUSR;
2269 else if (attr == &dev_attr_priv_sess_state.attr)
2272 WARN_ONCE(1, "Invalid session attr");
2276 return t->attr_is_visible(ISCSI_PARAM, param);
2279 static struct attribute_group iscsi_session_group = {
2280 .attrs = iscsi_session_attrs,
2281 .is_visible = iscsi_session_attr_is_visible,
2287 #define iscsi_host_attr_show(param) \
2289 show_host_param_##param(struct device *dev, \
2290 struct device_attribute *attr, char *buf) \
2292 struct Scsi_Host *shost = transport_class_to_shost(dev); \
2293 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2294 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2297 #define iscsi_host_attr(field, param) \
2298 iscsi_host_attr_show(param) \
2299 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2302 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2303 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2304 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2305 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2307 #define SETUP_HOST_RD_ATTR(field, param_flag) \
2309 if (tt->host_param_mask & param_flag) { \
2310 priv->host_attrs[count] = &dev_attr_host_##field; \
2315 static int iscsi_session_match(struct attribute_container *cont,
2318 struct iscsi_cls_session *session;
2319 struct Scsi_Host *shost;
2320 struct iscsi_internal *priv;
2322 if (!iscsi_is_session_dev(dev))
2325 session = iscsi_dev_to_session(dev);
2326 shost = iscsi_session_to_shost(session);
2327 if (!shost->transportt)
2330 priv = to_iscsi_internal(shost->transportt);
2331 if (priv->session_cont.ac.class != &iscsi_session_class.class)
2334 return &priv->session_cont.ac == cont;
2337 static int iscsi_conn_match(struct attribute_container *cont,
2340 struct iscsi_cls_session *session;
2341 struct iscsi_cls_conn *conn;
2342 struct Scsi_Host *shost;
2343 struct iscsi_internal *priv;
2345 if (!iscsi_is_conn_dev(dev))
2348 conn = iscsi_dev_to_conn(dev);
2349 session = iscsi_dev_to_session(conn->dev.parent);
2350 shost = iscsi_session_to_shost(session);
2352 if (!shost->transportt)
2355 priv = to_iscsi_internal(shost->transportt);
2356 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2359 return &priv->conn_cont.ac == cont;
2362 static int iscsi_host_match(struct attribute_container *cont,
2365 struct Scsi_Host *shost;
2366 struct iscsi_internal *priv;
2368 if (!scsi_is_host_device(dev))
2371 shost = dev_to_shost(dev);
2372 if (!shost->transportt ||
2373 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2376 priv = to_iscsi_internal(shost->transportt);
2377 return &priv->t.host_attrs.ac == cont;
2380 struct scsi_transport_template *
2381 iscsi_register_transport(struct iscsi_transport *tt)
2383 struct iscsi_internal *priv;
2384 unsigned long flags;
2389 priv = iscsi_if_transport_lookup(tt);
2393 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2396 INIT_LIST_HEAD(&priv->list);
2397 priv->iscsi_transport = tt;
2398 priv->t.user_scan = iscsi_user_scan;
2399 priv->t.create_work_queue = 1;
2401 priv->dev.class = &iscsi_transport_class;
2402 dev_set_name(&priv->dev, "%s", tt->name);
2403 err = device_register(&priv->dev);
2407 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2409 goto unregister_dev;
2411 /* host parameters */
2412 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2413 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2414 priv->t.host_attrs.ac.match = iscsi_host_match;
2415 priv->t.host_size = sizeof(struct iscsi_cls_host);
2416 transport_container_register(&priv->t.host_attrs);
2418 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
2419 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
2420 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
2421 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
2422 BUG_ON(count > ISCSI_HOST_ATTRS);
2423 priv->host_attrs[count] = NULL;
2426 /* connection parameters */
2427 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2428 priv->conn_cont.ac.match = iscsi_conn_match;
2429 priv->conn_cont.ac.grp = &iscsi_conn_group;
2430 transport_container_register(&priv->conn_cont);
2432 /* session parameters */
2433 priv->session_cont.ac.class = &iscsi_session_class.class;
2434 priv->session_cont.ac.match = iscsi_session_match;
2435 priv->session_cont.ac.grp = &iscsi_session_group;
2436 transport_container_register(&priv->session_cont);
2438 spin_lock_irqsave(&iscsi_transport_lock, flags);
2439 list_add(&priv->list, &iscsi_transports);
2440 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2442 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2446 device_unregister(&priv->dev);
2452 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2454 int iscsi_unregister_transport(struct iscsi_transport *tt)
2456 struct iscsi_internal *priv;
2457 unsigned long flags;
2461 mutex_lock(&rx_queue_mutex);
2463 priv = iscsi_if_transport_lookup(tt);
2466 spin_lock_irqsave(&iscsi_transport_lock, flags);
2467 list_del(&priv->list);
2468 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2470 transport_container_unregister(&priv->conn_cont);
2471 transport_container_unregister(&priv->session_cont);
2472 transport_container_unregister(&priv->t.host_attrs);
2474 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2475 device_unregister(&priv->dev);
2476 mutex_unlock(&rx_queue_mutex);
2480 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2482 static __init int iscsi_transport_init(void)
2486 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2487 ISCSI_TRANSPORT_VERSION);
2489 atomic_set(&iscsi_session_nr, 0);
2491 err = class_register(&iscsi_transport_class);
2495 err = class_register(&iscsi_endpoint_class);
2497 goto unregister_transport_class;
2499 err = class_register(&iscsi_iface_class);
2501 goto unregister_endpoint_class;
2503 err = transport_class_register(&iscsi_host_class);
2505 goto unregister_iface_class;
2507 err = transport_class_register(&iscsi_connection_class);
2509 goto unregister_host_class;
2511 err = transport_class_register(&iscsi_session_class);
2513 goto unregister_conn_class;
2515 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2519 goto unregister_session_class;
2522 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2523 if (!iscsi_eh_timer_workq)
2529 netlink_kernel_release(nls);
2530 unregister_session_class:
2531 transport_class_unregister(&iscsi_session_class);
2532 unregister_conn_class:
2533 transport_class_unregister(&iscsi_connection_class);
2534 unregister_host_class:
2535 transport_class_unregister(&iscsi_host_class);
2536 unregister_iface_class:
2537 class_unregister(&iscsi_iface_class);
2538 unregister_endpoint_class:
2539 class_unregister(&iscsi_endpoint_class);
2540 unregister_transport_class:
2541 class_unregister(&iscsi_transport_class);
2545 static void __exit iscsi_transport_exit(void)
2547 destroy_workqueue(iscsi_eh_timer_workq);
2548 netlink_kernel_release(nls);
2549 transport_class_unregister(&iscsi_connection_class);
2550 transport_class_unregister(&iscsi_session_class);
2551 transport_class_unregister(&iscsi_host_class);
2552 class_unregister(&iscsi_endpoint_class);
2553 class_unregister(&iscsi_iface_class);
2554 class_unregister(&iscsi_transport_class);
2557 module_init(iscsi_transport_init);
2558 module_exit(iscsi_transport_exit);
2560 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2561 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2562 "Alex Aizman <itn780@yahoo.com>");
2563 MODULE_DESCRIPTION("iSCSI Transport Interface");
2564 MODULE_LICENSE("GPL");
2565 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2566 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);