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>
26 #include <linux/bsg-lib.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_host.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_transport.h>
32 #include <scsi/scsi_transport_iscsi.h>
33 #include <scsi/iscsi_if.h>
34 #include <scsi/scsi_cmnd.h>
35 #include <scsi/scsi_bsg_iscsi.h>
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 transport_container conn_cont;
78 struct transport_container session_cont;
81 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
82 static struct workqueue_struct *iscsi_eh_timer_workq;
85 * list of registered transports and lock that must
86 * be held while accessing list. The iscsi_transport_lock must
87 * be acquired after the rx_queue_mutex.
89 static LIST_HEAD(iscsi_transports);
90 static DEFINE_SPINLOCK(iscsi_transport_lock);
92 #define to_iscsi_internal(tmpl) \
93 container_of(tmpl, struct iscsi_internal, t)
95 #define dev_to_iscsi_internal(_dev) \
96 container_of(_dev, struct iscsi_internal, dev)
98 static void iscsi_transport_release(struct device *dev)
100 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
105 * iscsi_transport_class represents the iscsi_transports that are
108 static struct class iscsi_transport_class = {
109 .name = "iscsi_transport",
110 .dev_release = iscsi_transport_release,
114 show_transport_handle(struct device *dev, struct device_attribute *attr,
117 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
118 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
120 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
122 #define show_transport_attr(name, format) \
124 show_transport_##name(struct device *dev, \
125 struct device_attribute *attr,char *buf) \
127 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
128 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
130 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
132 show_transport_attr(caps, "0x%x");
134 static struct attribute *iscsi_transport_attrs[] = {
135 &dev_attr_handle.attr,
140 static struct attribute_group iscsi_transport_group = {
141 .attrs = iscsi_transport_attrs,
145 * iSCSI endpoint attrs
147 #define iscsi_dev_to_endpoint(_dev) \
148 container_of(_dev, struct iscsi_endpoint, dev)
150 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
151 struct device_attribute dev_attr_##_prefix##_##_name = \
152 __ATTR(_name,_mode,_show,_store)
154 static void iscsi_endpoint_release(struct device *dev)
156 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
160 static struct class iscsi_endpoint_class = {
161 .name = "iscsi_endpoint",
162 .dev_release = iscsi_endpoint_release,
166 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
168 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
169 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
171 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
173 static struct attribute *iscsi_endpoint_attrs[] = {
174 &dev_attr_ep_handle.attr,
178 static struct attribute_group iscsi_endpoint_group = {
179 .attrs = iscsi_endpoint_attrs,
182 #define ISCSI_MAX_EPID -1
184 static int iscsi_match_epid(struct device *dev, void *data)
186 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
187 uint64_t *epid = (uint64_t *) data;
189 return *epid == ep->id;
192 struct iscsi_endpoint *
193 iscsi_create_endpoint(int dd_size)
196 struct iscsi_endpoint *ep;
200 for (id = 1; id < ISCSI_MAX_EPID; id++) {
201 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
206 if (id == ISCSI_MAX_EPID) {
207 printk(KERN_ERR "Too many connections. Max supported %u\n",
212 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
217 ep->dev.class = &iscsi_endpoint_class;
218 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
219 err = device_register(&ep->dev);
223 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
228 ep->dd_data = &ep[1];
232 device_unregister(&ep->dev);
239 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
241 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
243 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
244 device_unregister(&ep->dev);
246 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
248 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
250 struct iscsi_endpoint *ep;
253 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
258 ep = iscsi_dev_to_endpoint(dev);
260 * we can drop this now because the interface will prevent
261 * removals and lookups from racing.
266 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
269 * Interface to display network param to sysfs
272 static void iscsi_iface_release(struct device *dev)
274 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
275 struct device *parent = iface->dev.parent;
282 static struct class iscsi_iface_class = {
283 .name = "iscsi_iface",
284 .dev_release = iscsi_iface_release,
287 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
288 struct device_attribute dev_attr_##_prefix##_##_name = \
289 __ATTR(_name, _mode, _show, _store)
291 /* iface attrs show */
292 #define iscsi_iface_attr_show(type, name, param_type, param) \
294 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
297 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
298 struct iscsi_transport *t = iface->transport; \
299 return t->get_iface_param(iface, param_type, param, buf); \
302 #define iscsi_iface_net_attr(type, name, param) \
303 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
304 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
306 /* generic read only ipvi4 attribute */
307 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
308 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
309 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
310 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
312 /* generic read only ipv6 attribute */
313 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
314 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
315 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
316 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
317 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
318 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
319 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
321 /* common read only iface attribute */
322 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
323 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
324 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
325 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
326 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
328 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
329 struct attribute *attr, int i)
331 struct device *dev = container_of(kobj, struct device, kobj);
332 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
333 struct iscsi_transport *t = iface->transport;
336 if (attr == &dev_attr_iface_enabled.attr)
337 param = ISCSI_NET_PARAM_IFACE_ENABLE;
338 else if (attr == &dev_attr_iface_vlan.attr)
339 param = ISCSI_NET_PARAM_VLAN_ID;
340 else if (attr == &dev_attr_iface_vlan_priority.attr)
341 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
342 else if (attr == &dev_attr_iface_vlan_enabled.attr)
343 param = ISCSI_NET_PARAM_VLAN_ENABLED;
344 else if (attr == &dev_attr_iface_mtu.attr)
345 param = ISCSI_NET_PARAM_MTU;
346 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
347 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
348 param = ISCSI_NET_PARAM_IPV4_ADDR;
349 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
350 param = ISCSI_NET_PARAM_IPV4_GW;
351 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
352 param = ISCSI_NET_PARAM_IPV4_SUBNET;
353 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
354 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
357 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
358 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
359 param = ISCSI_NET_PARAM_IPV6_ADDR;
360 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
361 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
362 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
363 param = ISCSI_NET_PARAM_IPV6_ROUTER;
364 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
365 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
366 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
367 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
371 WARN_ONCE(1, "Invalid iface attr");
375 return t->attr_is_visible(ISCSI_NET_PARAM, param);
378 static struct attribute *iscsi_iface_attrs[] = {
379 &dev_attr_iface_enabled.attr,
380 &dev_attr_iface_vlan.attr,
381 &dev_attr_iface_vlan_priority.attr,
382 &dev_attr_iface_vlan_enabled.attr,
383 &dev_attr_ipv4_iface_ipaddress.attr,
384 &dev_attr_ipv4_iface_gateway.attr,
385 &dev_attr_ipv4_iface_subnet.attr,
386 &dev_attr_ipv4_iface_bootproto.attr,
387 &dev_attr_ipv6_iface_ipaddress.attr,
388 &dev_attr_ipv6_iface_link_local_addr.attr,
389 &dev_attr_ipv6_iface_router_addr.attr,
390 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
391 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
392 &dev_attr_iface_mtu.attr,
396 static struct attribute_group iscsi_iface_group = {
397 .attrs = iscsi_iface_attrs,
398 .is_visible = iscsi_iface_attr_is_visible,
402 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
403 uint32_t iface_type, uint32_t iface_num, int dd_size)
405 struct iscsi_iface *iface;
408 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
412 iface->transport = transport;
413 iface->iface_type = iface_type;
414 iface->iface_num = iface_num;
415 iface->dev.release = iscsi_iface_release;
416 iface->dev.class = &iscsi_iface_class;
417 /* parent reference released in iscsi_iface_release */
418 iface->dev.parent = get_device(&shost->shost_gendev);
419 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
420 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
423 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
426 err = device_register(&iface->dev);
430 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
435 iface->dd_data = &iface[1];
439 device_unregister(&iface->dev);
443 put_device(iface->dev.parent);
447 EXPORT_SYMBOL_GPL(iscsi_create_iface);
449 void iscsi_destroy_iface(struct iscsi_iface *iface)
451 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
452 device_unregister(&iface->dev);
454 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
460 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
461 * @job: bsg job to be processed
463 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
465 struct Scsi_Host *shost = iscsi_job_to_shost(job);
466 struct iscsi_bsg_request *req = job->request;
467 struct iscsi_bsg_reply *reply = job->reply;
468 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
469 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
472 /* check if we have the msgcode value at least */
473 if (job->request_len < sizeof(uint32_t)) {
478 /* Validate the host command */
479 switch (req->msgcode) {
480 case ISCSI_BSG_HST_VENDOR:
481 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
482 if ((shost->hostt->vendor_id == 0L) ||
483 (req->rqst_data.h_vendor.vendor_id !=
484 shost->hostt->vendor_id)) {
494 /* check if we really have all the request data needed */
495 if (job->request_len < cmdlen) {
500 ret = i->iscsi_transport->bsg_request(job);
505 /* return the errno failure code as the only status */
506 BUG_ON(job->reply_len < sizeof(uint32_t));
507 reply->reply_payload_rcv_len = 0;
509 job->reply_len = sizeof(uint32_t);
510 bsg_job_done(job, ret, 0);
515 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
516 * @shost: shost for iscsi_host
517 * @cls_host: iscsi_cls_host adding the structures to
520 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
522 struct device *dev = &shost->shost_gendev;
523 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
524 struct request_queue *q;
528 if (!i->iscsi_transport->bsg_request)
531 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
533 q = __scsi_alloc_queue(shost, bsg_request_fn);
537 ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
539 shost_printk(KERN_ERR, shost, "bsg interface failed to "
540 "initialize - no request queue\n");
541 blk_cleanup_queue(q);
549 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
552 struct Scsi_Host *shost = dev_to_shost(dev);
553 struct iscsi_cls_host *ihost = shost->shost_data;
555 memset(ihost, 0, sizeof(*ihost));
556 atomic_set(&ihost->nr_scans, 0);
557 mutex_init(&ihost->mutex);
559 iscsi_bsg_host_add(shost, ihost);
560 /* ignore any bsg add error - we just can't do sgio */
565 static int iscsi_remove_host(struct transport_container *tc,
566 struct device *dev, struct device *cdev)
568 struct Scsi_Host *shost = dev_to_shost(dev);
569 struct iscsi_cls_host *ihost = shost->shost_data;
572 bsg_remove_queue(ihost->bsg_q);
573 blk_cleanup_queue(ihost->bsg_q);
578 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
584 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
590 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
596 static struct sock *nls;
597 static DEFINE_MUTEX(rx_queue_mutex);
599 static LIST_HEAD(sesslist);
600 static DEFINE_SPINLOCK(sesslock);
601 static LIST_HEAD(connlist);
602 static DEFINE_SPINLOCK(connlock);
604 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
606 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
611 * Returns the matching session to a given sid
613 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
616 struct iscsi_cls_session *sess;
618 spin_lock_irqsave(&sesslock, flags);
619 list_for_each_entry(sess, &sesslist, sess_list) {
620 if (sess->sid == sid) {
621 spin_unlock_irqrestore(&sesslock, flags);
625 spin_unlock_irqrestore(&sesslock, flags);
630 * Returns the matching connection to a given sid / cid tuple
632 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
635 struct iscsi_cls_conn *conn;
637 spin_lock_irqsave(&connlock, flags);
638 list_for_each_entry(conn, &connlist, conn_list) {
639 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
640 spin_unlock_irqrestore(&connlock, flags);
644 spin_unlock_irqrestore(&connlock, flags);
649 * The following functions can be used by LLDs that allocate
650 * their own scsi_hosts or by software iscsi LLDs
655 } iscsi_session_state_names[] = {
656 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
657 { ISCSI_SESSION_FAILED, "FAILED" },
658 { ISCSI_SESSION_FREE, "FREE" },
661 static const char *iscsi_session_state_name(int state)
666 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
667 if (iscsi_session_state_names[i].value == state) {
668 name = iscsi_session_state_names[i].name;
675 int iscsi_session_chkready(struct iscsi_cls_session *session)
680 spin_lock_irqsave(&session->lock, flags);
681 switch (session->state) {
682 case ISCSI_SESSION_LOGGED_IN:
685 case ISCSI_SESSION_FAILED:
686 err = DID_IMM_RETRY << 16;
688 case ISCSI_SESSION_FREE:
689 err = DID_TRANSPORT_FAILFAST << 16;
692 err = DID_NO_CONNECT << 16;
695 spin_unlock_irqrestore(&session->lock, flags);
698 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
700 int iscsi_is_session_online(struct iscsi_cls_session *session)
705 spin_lock_irqsave(&session->lock, flags);
706 if (session->state == ISCSI_SESSION_LOGGED_IN)
708 spin_unlock_irqrestore(&session->lock, flags);
711 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
713 static void iscsi_session_release(struct device *dev)
715 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
716 struct Scsi_Host *shost;
718 shost = iscsi_session_to_shost(session);
719 scsi_host_put(shost);
720 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
724 static int iscsi_is_session_dev(const struct device *dev)
726 return dev->release == iscsi_session_release;
729 static int iscsi_iter_session_fn(struct device *dev, void *data)
731 void (* fn) (struct iscsi_cls_session *) = data;
733 if (!iscsi_is_session_dev(dev))
735 fn(iscsi_dev_to_session(dev));
739 void iscsi_host_for_each_session(struct Scsi_Host *shost,
740 void (*fn)(struct iscsi_cls_session *))
742 device_for_each_child(&shost->shost_gendev, fn,
743 iscsi_iter_session_fn);
745 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
748 * iscsi_scan_finished - helper to report when running scans are done
750 * @time: scan run time
752 * This function can be used by drives like qla4xxx to report to the scsi
753 * layer when the scans it kicked off at module load time are done.
755 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
757 struct iscsi_cls_host *ihost = shost->shost_data;
759 * qla4xxx will have kicked off some session unblocks before calling
760 * scsi_scan_host, so just wait for them to complete.
762 return !atomic_read(&ihost->nr_scans);
764 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
766 struct iscsi_scan_data {
767 unsigned int channel;
772 static int iscsi_user_scan_session(struct device *dev, void *data)
774 struct iscsi_scan_data *scan_data = data;
775 struct iscsi_cls_session *session;
776 struct Scsi_Host *shost;
777 struct iscsi_cls_host *ihost;
781 if (!iscsi_is_session_dev(dev))
784 session = iscsi_dev_to_session(dev);
786 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
788 shost = iscsi_session_to_shost(session);
789 ihost = shost->shost_data;
791 mutex_lock(&ihost->mutex);
792 spin_lock_irqsave(&session->lock, flags);
793 if (session->state != ISCSI_SESSION_LOGGED_IN) {
794 spin_unlock_irqrestore(&session->lock, flags);
797 id = session->target_id;
798 spin_unlock_irqrestore(&session->lock, flags);
800 if (id != ISCSI_MAX_TARGET) {
801 if ((scan_data->channel == SCAN_WILD_CARD ||
802 scan_data->channel == 0) &&
803 (scan_data->id == SCAN_WILD_CARD ||
804 scan_data->id == id))
805 scsi_scan_target(&session->dev, 0, id,
810 mutex_unlock(&ihost->mutex);
811 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
815 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
818 struct iscsi_scan_data scan_data;
820 scan_data.channel = channel;
824 return device_for_each_child(&shost->shost_gendev, &scan_data,
825 iscsi_user_scan_session);
828 static void iscsi_scan_session(struct work_struct *work)
830 struct iscsi_cls_session *session =
831 container_of(work, struct iscsi_cls_session, scan_work);
832 struct Scsi_Host *shost = iscsi_session_to_shost(session);
833 struct iscsi_cls_host *ihost = shost->shost_data;
834 struct iscsi_scan_data scan_data;
836 scan_data.channel = 0;
837 scan_data.id = SCAN_WILD_CARD;
838 scan_data.lun = SCAN_WILD_CARD;
840 iscsi_user_scan_session(&session->dev, &scan_data);
841 atomic_dec(&ihost->nr_scans);
845 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
846 * @cmd: scsi cmd passed to scsi eh handler
848 * If the session is down this function will wait for the recovery
849 * timer to fire or for the session to be logged back in. If the
850 * recovery timer fires then FAST_IO_FAIL is returned. The caller
851 * should pass this error value to the scsi eh.
853 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
855 struct iscsi_cls_session *session =
856 starget_to_session(scsi_target(cmd->device));
860 spin_lock_irqsave(&session->lock, flags);
861 while (session->state != ISCSI_SESSION_LOGGED_IN) {
862 if (session->state == ISCSI_SESSION_FREE) {
866 spin_unlock_irqrestore(&session->lock, flags);
868 spin_lock_irqsave(&session->lock, flags);
870 spin_unlock_irqrestore(&session->lock, flags);
873 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
875 static void session_recovery_timedout(struct work_struct *work)
877 struct iscsi_cls_session *session =
878 container_of(work, struct iscsi_cls_session,
882 iscsi_cls_session_printk(KERN_INFO, session,
883 "session recovery timed out after %d secs\n",
884 session->recovery_tmo);
886 spin_lock_irqsave(&session->lock, flags);
887 switch (session->state) {
888 case ISCSI_SESSION_FAILED:
889 session->state = ISCSI_SESSION_FREE;
891 case ISCSI_SESSION_LOGGED_IN:
892 case ISCSI_SESSION_FREE:
893 /* we raced with the unblock's flush */
894 spin_unlock_irqrestore(&session->lock, flags);
897 spin_unlock_irqrestore(&session->lock, flags);
899 if (session->transport->session_recovery_timedout)
900 session->transport->session_recovery_timedout(session);
902 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
903 scsi_target_unblock(&session->dev);
904 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
907 static void __iscsi_unblock_session(struct work_struct *work)
909 struct iscsi_cls_session *session =
910 container_of(work, struct iscsi_cls_session,
912 struct Scsi_Host *shost = iscsi_session_to_shost(session);
913 struct iscsi_cls_host *ihost = shost->shost_data;
916 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
918 * The recovery and unblock work get run from the same workqueue,
919 * so try to cancel it if it was going to run after this unblock.
921 cancel_delayed_work(&session->recovery_work);
922 spin_lock_irqsave(&session->lock, flags);
923 session->state = ISCSI_SESSION_LOGGED_IN;
924 spin_unlock_irqrestore(&session->lock, flags);
926 scsi_target_unblock(&session->dev);
928 * Only do kernel scanning if the driver is properly hooked into
929 * the async scanning code (drivers like iscsi_tcp do login and
930 * scanning from userspace).
932 if (shost->hostt->scan_finished) {
933 if (scsi_queue_work(shost, &session->scan_work))
934 atomic_inc(&ihost->nr_scans);
936 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
940 * iscsi_unblock_session - set a session as logged in and start IO.
941 * @session: iscsi session
943 * Mark a session as ready to accept IO.
945 void iscsi_unblock_session(struct iscsi_cls_session *session)
947 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
949 * make sure all the events have completed before tell the driver
952 flush_workqueue(iscsi_eh_timer_workq);
954 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
956 static void __iscsi_block_session(struct work_struct *work)
958 struct iscsi_cls_session *session =
959 container_of(work, struct iscsi_cls_session,
963 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
964 spin_lock_irqsave(&session->lock, flags);
965 session->state = ISCSI_SESSION_FAILED;
966 spin_unlock_irqrestore(&session->lock, flags);
967 scsi_target_block(&session->dev);
968 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
969 if (session->recovery_tmo >= 0)
970 queue_delayed_work(iscsi_eh_timer_workq,
971 &session->recovery_work,
972 session->recovery_tmo * HZ);
975 void iscsi_block_session(struct iscsi_cls_session *session)
977 queue_work(iscsi_eh_timer_workq, &session->block_work);
979 EXPORT_SYMBOL_GPL(iscsi_block_session);
981 static void __iscsi_unbind_session(struct work_struct *work)
983 struct iscsi_cls_session *session =
984 container_of(work, struct iscsi_cls_session,
986 struct Scsi_Host *shost = iscsi_session_to_shost(session);
987 struct iscsi_cls_host *ihost = shost->shost_data;
990 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
992 /* Prevent new scans and make sure scanning is not in progress */
993 mutex_lock(&ihost->mutex);
994 spin_lock_irqsave(&session->lock, flags);
995 if (session->target_id == ISCSI_MAX_TARGET) {
996 spin_unlock_irqrestore(&session->lock, flags);
997 mutex_unlock(&ihost->mutex);
1000 session->target_id = ISCSI_MAX_TARGET;
1001 spin_unlock_irqrestore(&session->lock, flags);
1002 mutex_unlock(&ihost->mutex);
1004 scsi_remove_target(&session->dev);
1005 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1006 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1009 struct iscsi_cls_session *
1010 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1013 struct iscsi_cls_session *session;
1015 session = kzalloc(sizeof(*session) + dd_size,
1020 session->transport = transport;
1021 session->recovery_tmo = 120;
1022 session->state = ISCSI_SESSION_FREE;
1023 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1024 INIT_LIST_HEAD(&session->sess_list);
1025 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1026 INIT_WORK(&session->block_work, __iscsi_block_session);
1027 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1028 INIT_WORK(&session->scan_work, iscsi_scan_session);
1029 spin_lock_init(&session->lock);
1031 /* this is released in the dev's release function */
1032 scsi_host_get(shost);
1033 session->dev.parent = &shost->shost_gendev;
1034 session->dev.release = iscsi_session_release;
1035 device_initialize(&session->dev);
1037 session->dd_data = &session[1];
1039 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1042 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1044 static int iscsi_get_next_target_id(struct device *dev, void *data)
1046 struct iscsi_cls_session *session;
1047 unsigned long flags;
1050 if (!iscsi_is_session_dev(dev))
1053 session = iscsi_dev_to_session(dev);
1054 spin_lock_irqsave(&session->lock, flags);
1055 if (*((unsigned int *) data) == session->target_id)
1057 spin_unlock_irqrestore(&session->lock, flags);
1061 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1063 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1064 struct iscsi_cls_host *ihost;
1065 unsigned long flags;
1066 unsigned int id = target_id;
1069 ihost = shost->shost_data;
1070 session->sid = atomic_add_return(1, &iscsi_session_nr);
1072 if (id == ISCSI_MAX_TARGET) {
1073 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
1074 err = device_for_each_child(&shost->shost_gendev, &id,
1075 iscsi_get_next_target_id);
1080 if (id == ISCSI_MAX_TARGET) {
1081 iscsi_cls_session_printk(KERN_ERR, session,
1082 "Too many iscsi targets. Max "
1083 "number of targets is %d.\n",
1084 ISCSI_MAX_TARGET - 1);
1089 session->target_id = id;
1091 dev_set_name(&session->dev, "session%u", session->sid);
1092 err = device_add(&session->dev);
1094 iscsi_cls_session_printk(KERN_ERR, session,
1095 "could not register session's dev\n");
1098 transport_register_device(&session->dev);
1100 spin_lock_irqsave(&sesslock, flags);
1101 list_add(&session->sess_list, &sesslist);
1102 spin_unlock_irqrestore(&sesslock, flags);
1104 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1105 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1109 scsi_host_put(shost);
1112 EXPORT_SYMBOL_GPL(iscsi_add_session);
1115 * iscsi_create_session - create iscsi class session
1117 * @transport: iscsi transport
1118 * @dd_size: private driver data size
1119 * @target_id: which target
1121 * This can be called from a LLD or iscsi_transport.
1123 struct iscsi_cls_session *
1124 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1125 int dd_size, unsigned int target_id)
1127 struct iscsi_cls_session *session;
1129 session = iscsi_alloc_session(shost, transport, dd_size);
1133 if (iscsi_add_session(session, target_id)) {
1134 iscsi_free_session(session);
1139 EXPORT_SYMBOL_GPL(iscsi_create_session);
1141 static void iscsi_conn_release(struct device *dev)
1143 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1144 struct device *parent = conn->dev.parent;
1146 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1151 static int iscsi_is_conn_dev(const struct device *dev)
1153 return dev->release == iscsi_conn_release;
1156 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1158 if (!iscsi_is_conn_dev(dev))
1160 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1163 void iscsi_remove_session(struct iscsi_cls_session *session)
1165 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1166 unsigned long flags;
1169 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1171 spin_lock_irqsave(&sesslock, flags);
1172 list_del(&session->sess_list);
1173 spin_unlock_irqrestore(&sesslock, flags);
1175 /* make sure there are no blocks/unblocks queued */
1176 flush_workqueue(iscsi_eh_timer_workq);
1177 /* make sure the timedout callout is not running */
1178 if (!cancel_delayed_work(&session->recovery_work))
1179 flush_workqueue(iscsi_eh_timer_workq);
1181 * If we are blocked let commands flow again. The lld or iscsi
1182 * layer should set up the queuecommand to fail commands.
1183 * We assume that LLD will not be calling block/unblock while
1184 * removing the session.
1186 spin_lock_irqsave(&session->lock, flags);
1187 session->state = ISCSI_SESSION_FREE;
1188 spin_unlock_irqrestore(&session->lock, flags);
1190 scsi_target_unblock(&session->dev);
1191 /* flush running scans then delete devices */
1192 scsi_flush_work(shost);
1193 __iscsi_unbind_session(&session->unbind_work);
1195 /* hw iscsi may not have removed all connections from session */
1196 err = device_for_each_child(&session->dev, NULL,
1197 iscsi_iter_destroy_conn_fn);
1199 iscsi_cls_session_printk(KERN_ERR, session,
1200 "Could not delete all connections "
1201 "for session. Error %d.\n", err);
1203 transport_unregister_device(&session->dev);
1205 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1206 device_del(&session->dev);
1208 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1210 void iscsi_free_session(struct iscsi_cls_session *session)
1212 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1213 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1214 put_device(&session->dev);
1216 EXPORT_SYMBOL_GPL(iscsi_free_session);
1219 * iscsi_destroy_session - destroy iscsi session
1220 * @session: iscsi_session
1222 * Can be called by a LLD or iscsi_transport. There must not be
1223 * any running connections.
1225 int iscsi_destroy_session(struct iscsi_cls_session *session)
1227 iscsi_remove_session(session);
1228 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1229 iscsi_free_session(session);
1232 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1235 * iscsi_create_conn - create iscsi class connection
1236 * @session: iscsi cls session
1237 * @dd_size: private driver data size
1238 * @cid: connection id
1240 * This can be called from a LLD or iscsi_transport. The connection
1241 * is child of the session so cid must be unique for all connections
1244 * Since we do not support MCS, cid will normally be zero. In some cases
1245 * for software iscsi we could be trying to preallocate a connection struct
1246 * in which case there could be two connection structs and cid would be
1249 struct iscsi_cls_conn *
1250 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1252 struct iscsi_transport *transport = session->transport;
1253 struct iscsi_cls_conn *conn;
1254 unsigned long flags;
1257 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1261 conn->dd_data = &conn[1];
1263 mutex_init(&conn->ep_mutex);
1264 INIT_LIST_HEAD(&conn->conn_list);
1265 conn->transport = transport;
1268 /* this is released in the dev's release function */
1269 if (!get_device(&session->dev))
1272 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1273 conn->dev.parent = &session->dev;
1274 conn->dev.release = iscsi_conn_release;
1275 err = device_register(&conn->dev);
1277 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1278 "register connection's dev\n");
1279 goto release_parent_ref;
1281 transport_register_device(&conn->dev);
1283 spin_lock_irqsave(&connlock, flags);
1284 list_add(&conn->conn_list, &connlist);
1285 spin_unlock_irqrestore(&connlock, flags);
1287 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1291 put_device(&session->dev);
1297 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1300 * iscsi_destroy_conn - destroy iscsi class connection
1301 * @conn: iscsi cls session
1303 * This can be called from a LLD or iscsi_transport.
1305 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1307 unsigned long flags;
1309 spin_lock_irqsave(&connlock, flags);
1310 list_del(&conn->conn_list);
1311 spin_unlock_irqrestore(&connlock, flags);
1313 transport_unregister_device(&conn->dev);
1314 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1315 device_unregister(&conn->dev);
1318 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1321 * iscsi interface functions
1323 static struct iscsi_internal *
1324 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1326 struct iscsi_internal *priv;
1327 unsigned long flags;
1329 spin_lock_irqsave(&iscsi_transport_lock, flags);
1330 list_for_each_entry(priv, &iscsi_transports, list) {
1331 if (tt == priv->iscsi_transport) {
1332 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1336 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1341 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1343 return nlmsg_multicast(nls, skb, 0, group, gfp);
1346 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1347 char *data, uint32_t data_size)
1349 struct nlmsghdr *nlh;
1350 struct sk_buff *skb;
1351 struct iscsi_uevent *ev;
1353 struct iscsi_internal *priv;
1354 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1357 priv = iscsi_if_transport_lookup(conn->transport);
1361 skb = alloc_skb(len, GFP_ATOMIC);
1363 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1364 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1365 "control PDU: OOM\n");
1369 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1370 ev = NLMSG_DATA(nlh);
1371 memset(ev, 0, sizeof(*ev));
1372 ev->transport_handle = iscsi_handle(conn->transport);
1373 ev->type = ISCSI_KEVENT_RECV_PDU;
1374 ev->r.recv_req.cid = conn->cid;
1375 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1376 pdu = (char*)ev + sizeof(*ev);
1377 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1378 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1380 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1382 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1384 int iscsi_offload_mesg(struct Scsi_Host *shost,
1385 struct iscsi_transport *transport, uint32_t type,
1386 char *data, uint16_t data_size)
1388 struct nlmsghdr *nlh;
1389 struct sk_buff *skb;
1390 struct iscsi_uevent *ev;
1391 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1393 skb = alloc_skb(len, GFP_ATOMIC);
1395 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1399 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1400 ev = NLMSG_DATA(nlh);
1401 memset(ev, 0, sizeof(*ev));
1403 ev->transport_handle = iscsi_handle(transport);
1405 case ISCSI_KEVENT_PATH_REQ:
1406 ev->r.req_path.host_no = shost->host_no;
1408 case ISCSI_KEVENT_IF_DOWN:
1409 ev->r.notify_if_down.host_no = shost->host_no;
1413 memcpy((char *)ev + sizeof(*ev), data, data_size);
1415 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1417 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1419 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1421 struct nlmsghdr *nlh;
1422 struct sk_buff *skb;
1423 struct iscsi_uevent *ev;
1424 struct iscsi_internal *priv;
1425 int len = NLMSG_SPACE(sizeof(*ev));
1427 priv = iscsi_if_transport_lookup(conn->transport);
1431 skb = alloc_skb(len, GFP_ATOMIC);
1433 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1434 "conn error (%d)\n", error);
1438 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1439 ev = NLMSG_DATA(nlh);
1440 ev->transport_handle = iscsi_handle(conn->transport);
1441 ev->type = ISCSI_KEVENT_CONN_ERROR;
1442 ev->r.connerror.error = error;
1443 ev->r.connerror.cid = conn->cid;
1444 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1446 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1448 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1451 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1453 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1454 enum iscsi_conn_state state)
1456 struct nlmsghdr *nlh;
1457 struct sk_buff *skb;
1458 struct iscsi_uevent *ev;
1459 struct iscsi_internal *priv;
1460 int len = NLMSG_SPACE(sizeof(*ev));
1462 priv = iscsi_if_transport_lookup(conn->transport);
1466 skb = alloc_skb(len, GFP_ATOMIC);
1468 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1469 "conn login (%d)\n", state);
1473 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1474 ev = NLMSG_DATA(nlh);
1475 ev->transport_handle = iscsi_handle(conn->transport);
1476 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1477 ev->r.conn_login.state = state;
1478 ev->r.conn_login.cid = conn->cid;
1479 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1480 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1482 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1485 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1488 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1489 void *payload, int size)
1491 struct sk_buff *skb;
1492 struct nlmsghdr *nlh;
1493 int len = NLMSG_SPACE(size);
1494 int flags = multi ? NLM_F_MULTI : 0;
1495 int t = done ? NLMSG_DONE : type;
1497 skb = alloc_skb(len, GFP_ATOMIC);
1499 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1503 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1504 nlh->nlmsg_flags = flags;
1505 memcpy(NLMSG_DATA(nlh), payload, size);
1506 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1510 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1512 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1513 struct iscsi_stats *stats;
1514 struct sk_buff *skbstat;
1515 struct iscsi_cls_conn *conn;
1516 struct nlmsghdr *nlhstat;
1517 struct iscsi_uevent *evstat;
1518 struct iscsi_internal *priv;
1519 int len = NLMSG_SPACE(sizeof(*ev) +
1520 sizeof(struct iscsi_stats) +
1521 sizeof(struct iscsi_stats_custom) *
1522 ISCSI_STATS_CUSTOM_MAX);
1525 priv = iscsi_if_transport_lookup(transport);
1529 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1536 skbstat = alloc_skb(len, GFP_ATOMIC);
1538 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1539 "deliver stats: OOM\n");
1543 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1544 (len - sizeof(*nlhstat)), 0);
1545 evstat = NLMSG_DATA(nlhstat);
1546 memset(evstat, 0, sizeof(*evstat));
1547 evstat->transport_handle = iscsi_handle(conn->transport);
1548 evstat->type = nlh->nlmsg_type;
1549 evstat->u.get_stats.cid =
1550 ev->u.get_stats.cid;
1551 evstat->u.get_stats.sid =
1552 ev->u.get_stats.sid;
1553 stats = (struct iscsi_stats *)
1554 ((char*)evstat + sizeof(*evstat));
1555 memset(stats, 0, sizeof(*stats));
1557 transport->get_stats(conn, stats);
1558 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1559 sizeof(struct iscsi_stats) +
1560 sizeof(struct iscsi_stats_custom) *
1561 stats->custom_length);
1562 actual_size -= sizeof(*nlhstat);
1563 actual_size = NLMSG_LENGTH(actual_size);
1564 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1565 nlhstat->nlmsg_len = actual_size;
1567 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1569 } while (err < 0 && err != -ECONNREFUSED);
1575 * iscsi_session_event - send session destr. completion event
1576 * @session: iscsi class session
1577 * @event: type of event
1579 int iscsi_session_event(struct iscsi_cls_session *session,
1580 enum iscsi_uevent_e event)
1582 struct iscsi_internal *priv;
1583 struct Scsi_Host *shost;
1584 struct iscsi_uevent *ev;
1585 struct sk_buff *skb;
1586 struct nlmsghdr *nlh;
1587 int rc, len = NLMSG_SPACE(sizeof(*ev));
1589 priv = iscsi_if_transport_lookup(session->transport);
1592 shost = iscsi_session_to_shost(session);
1594 skb = alloc_skb(len, GFP_KERNEL);
1596 iscsi_cls_session_printk(KERN_ERR, session,
1597 "Cannot notify userspace of session "
1598 "event %u\n", event);
1602 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1603 ev = NLMSG_DATA(nlh);
1604 ev->transport_handle = iscsi_handle(session->transport);
1608 case ISCSI_KEVENT_DESTROY_SESSION:
1609 ev->r.d_session.host_no = shost->host_no;
1610 ev->r.d_session.sid = session->sid;
1612 case ISCSI_KEVENT_CREATE_SESSION:
1613 ev->r.c_session_ret.host_no = shost->host_no;
1614 ev->r.c_session_ret.sid = session->sid;
1616 case ISCSI_KEVENT_UNBIND_SESSION:
1617 ev->r.unbind_session.host_no = shost->host_no;
1618 ev->r.unbind_session.sid = session->sid;
1621 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1628 * this will occur if the daemon is not up, so we just warn
1629 * the user and when the daemon is restarted it will handle it
1631 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1633 iscsi_cls_session_printk(KERN_ERR, session,
1634 "Cannot notify userspace of session "
1635 "event %u. Check iscsi daemon\n",
1638 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1642 EXPORT_SYMBOL_GPL(iscsi_session_event);
1645 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1646 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1647 uint16_t cmds_max, uint16_t queue_depth)
1649 struct iscsi_transport *transport = priv->iscsi_transport;
1650 struct iscsi_cls_session *session;
1651 struct Scsi_Host *shost;
1653 session = transport->create_session(ep, cmds_max, queue_depth,
1658 shost = iscsi_session_to_shost(session);
1659 ev->r.c_session_ret.host_no = shost->host_no;
1660 ev->r.c_session_ret.sid = session->sid;
1661 ISCSI_DBG_TRANS_SESSION(session,
1662 "Completed creating transport session\n");
1667 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1669 struct iscsi_cls_conn *conn;
1670 struct iscsi_cls_session *session;
1672 session = iscsi_session_lookup(ev->u.c_conn.sid);
1674 printk(KERN_ERR "iscsi: invalid session %d.\n",
1679 conn = transport->create_conn(session, ev->u.c_conn.cid);
1681 iscsi_cls_session_printk(KERN_ERR, session,
1682 "couldn't create a new connection.");
1686 ev->r.c_conn_ret.sid = session->sid;
1687 ev->r.c_conn_ret.cid = conn->cid;
1689 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1694 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1696 struct iscsi_cls_conn *conn;
1698 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1702 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1703 if (transport->destroy_conn)
1704 transport->destroy_conn(conn);
1710 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1712 char *data = (char*)ev + sizeof(*ev);
1713 struct iscsi_cls_conn *conn;
1714 struct iscsi_cls_session *session;
1715 int err = 0, value = 0;
1717 session = iscsi_session_lookup(ev->u.set_param.sid);
1718 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1719 if (!conn || !session)
1722 switch (ev->u.set_param.param) {
1723 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1724 sscanf(data, "%d", &value);
1725 session->recovery_tmo = value;
1728 err = transport->set_param(conn, ev->u.set_param.param,
1729 data, ev->u.set_param.len);
1735 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1736 struct iscsi_uevent *ev, int msg_type)
1738 struct iscsi_endpoint *ep;
1739 struct sockaddr *dst_addr;
1740 struct Scsi_Host *shost = NULL;
1741 int non_blocking, err = 0;
1743 if (!transport->ep_connect)
1746 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1747 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1749 printk(KERN_ERR "ep connect failed. Could not find "
1751 ev->u.ep_connect_through_host.host_no);
1754 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1756 non_blocking = ev->u.ep_connect.non_blocking;
1758 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1759 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1765 ev->r.ep_connect_ret.handle = ep->id;
1768 scsi_host_put(shost);
1772 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1775 struct iscsi_cls_conn *conn;
1776 struct iscsi_endpoint *ep;
1778 if (!transport->ep_disconnect)
1781 ep = iscsi_lookup_endpoint(ep_handle);
1786 mutex_lock(&conn->ep_mutex);
1788 mutex_unlock(&conn->ep_mutex);
1791 transport->ep_disconnect(ep);
1796 iscsi_if_transport_ep(struct iscsi_transport *transport,
1797 struct iscsi_uevent *ev, int msg_type)
1799 struct iscsi_endpoint *ep;
1803 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1804 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1805 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1807 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1808 if (!transport->ep_poll)
1811 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1815 ev->r.retcode = transport->ep_poll(ep,
1816 ev->u.ep_poll.timeout_ms);
1818 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1819 rc = iscsi_if_ep_disconnect(transport,
1820 ev->u.ep_disconnect.ep_handle);
1827 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1828 struct iscsi_uevent *ev)
1830 struct Scsi_Host *shost;
1831 struct sockaddr *dst_addr;
1834 if (!transport->tgt_dscvr)
1837 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1839 printk(KERN_ERR "target discovery could not find host no %u\n",
1840 ev->u.tgt_dscvr.host_no);
1845 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1846 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1847 ev->u.tgt_dscvr.enable, dst_addr);
1848 scsi_host_put(shost);
1853 iscsi_set_host_param(struct iscsi_transport *transport,
1854 struct iscsi_uevent *ev)
1856 char *data = (char*)ev + sizeof(*ev);
1857 struct Scsi_Host *shost;
1860 if (!transport->set_host_param)
1863 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1865 printk(KERN_ERR "set_host_param could not find host no %u\n",
1866 ev->u.set_host_param.host_no);
1870 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1871 data, ev->u.set_host_param.len);
1872 scsi_host_put(shost);
1877 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1879 struct Scsi_Host *shost;
1880 struct iscsi_path *params;
1883 if (!transport->set_path)
1886 shost = scsi_host_lookup(ev->u.set_path.host_no);
1888 printk(KERN_ERR "set path could not find host no %u\n",
1889 ev->u.set_path.host_no);
1893 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1894 err = transport->set_path(shost, params);
1896 scsi_host_put(shost);
1901 iscsi_set_iface_params(struct iscsi_transport *transport,
1902 struct iscsi_uevent *ev)
1904 char *data = (char *)ev + sizeof(*ev);
1905 struct Scsi_Host *shost;
1908 if (!transport->set_iface_param)
1911 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1913 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1914 ev->u.set_iface_params.host_no);
1918 err = transport->set_iface_param(shost, data,
1919 ev->u.set_iface_params.count);
1920 scsi_host_put(shost);
1925 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1928 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1929 struct iscsi_transport *transport = NULL;
1930 struct iscsi_internal *priv;
1931 struct iscsi_cls_session *session;
1932 struct iscsi_cls_conn *conn;
1933 struct iscsi_endpoint *ep = NULL;
1935 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1936 *group = ISCSI_NL_GRP_UIP;
1938 *group = ISCSI_NL_GRP_ISCSID;
1940 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1943 transport = priv->iscsi_transport;
1945 if (!try_module_get(transport->owner))
1948 switch (nlh->nlmsg_type) {
1949 case ISCSI_UEVENT_CREATE_SESSION:
1950 err = iscsi_if_create_session(priv, ep, ev,
1951 ev->u.c_session.initial_cmdsn,
1952 ev->u.c_session.cmds_max,
1953 ev->u.c_session.queue_depth);
1955 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1956 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1962 err = iscsi_if_create_session(priv, ep, ev,
1963 ev->u.c_bound_session.initial_cmdsn,
1964 ev->u.c_bound_session.cmds_max,
1965 ev->u.c_bound_session.queue_depth);
1967 case ISCSI_UEVENT_DESTROY_SESSION:
1968 session = iscsi_session_lookup(ev->u.d_session.sid);
1970 transport->destroy_session(session);
1974 case ISCSI_UEVENT_UNBIND_SESSION:
1975 session = iscsi_session_lookup(ev->u.d_session.sid);
1977 scsi_queue_work(iscsi_session_to_shost(session),
1978 &session->unbind_work);
1982 case ISCSI_UEVENT_CREATE_CONN:
1983 err = iscsi_if_create_conn(transport, ev);
1985 case ISCSI_UEVENT_DESTROY_CONN:
1986 err = iscsi_if_destroy_conn(transport, ev);
1988 case ISCSI_UEVENT_BIND_CONN:
1989 session = iscsi_session_lookup(ev->u.b_conn.sid);
1990 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1992 if (conn && conn->ep)
1993 iscsi_if_ep_disconnect(transport, conn->ep->id);
1995 if (!session || !conn) {
2000 ev->r.retcode = transport->bind_conn(session, conn,
2001 ev->u.b_conn.transport_eph,
2002 ev->u.b_conn.is_leading);
2003 if (ev->r.retcode || !transport->ep_connect)
2006 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2010 mutex_lock(&conn->ep_mutex);
2012 mutex_unlock(&conn->ep_mutex);
2014 iscsi_cls_conn_printk(KERN_ERR, conn,
2015 "Could not set ep conn "
2018 case ISCSI_UEVENT_SET_PARAM:
2019 err = iscsi_set_param(transport, ev);
2021 case ISCSI_UEVENT_START_CONN:
2022 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2024 ev->r.retcode = transport->start_conn(conn);
2028 case ISCSI_UEVENT_STOP_CONN:
2029 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2031 transport->stop_conn(conn, ev->u.stop_conn.flag);
2035 case ISCSI_UEVENT_SEND_PDU:
2036 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
2038 ev->r.retcode = transport->send_pdu(conn,
2039 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2040 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2041 ev->u.send_pdu.data_size);
2045 case ISCSI_UEVENT_GET_STATS:
2046 err = iscsi_if_get_stats(transport, nlh);
2048 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2049 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2050 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2051 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2052 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2054 case ISCSI_UEVENT_TGT_DSCVR:
2055 err = iscsi_tgt_dscvr(transport, ev);
2057 case ISCSI_UEVENT_SET_HOST_PARAM:
2058 err = iscsi_set_host_param(transport, ev);
2060 case ISCSI_UEVENT_PATH_UPDATE:
2061 err = iscsi_set_path(transport, ev);
2063 case ISCSI_UEVENT_SET_IFACE_PARAMS:
2064 err = iscsi_set_iface_params(transport, ev);
2071 module_put(transport->owner);
2076 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
2077 * Malformed skbs with wrong lengths or invalid creds are not processed.
2080 iscsi_if_rx(struct sk_buff *skb)
2082 mutex_lock(&rx_queue_mutex);
2083 while (skb->len >= NLMSG_SPACE(0)) {
2086 struct nlmsghdr *nlh;
2087 struct iscsi_uevent *ev;
2090 nlh = nlmsg_hdr(skb);
2091 if (nlh->nlmsg_len < sizeof(*nlh) ||
2092 skb->len < nlh->nlmsg_len) {
2096 ev = NLMSG_DATA(nlh);
2097 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2098 if (rlen > skb->len)
2101 err = iscsi_if_recv_msg(skb, nlh, &group);
2103 ev->type = ISCSI_KEVENT_IF_ERROR;
2108 * special case for GET_STATS:
2109 * on success - sending reply and stats from
2110 * inside of if_recv_msg(),
2111 * on error - fall through.
2113 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2115 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2116 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2117 } while (err < 0 && err != -ECONNREFUSED);
2118 skb_pull(skb, rlen);
2120 mutex_unlock(&rx_queue_mutex);
2123 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
2124 struct device_attribute dev_attr_##_prefix##_##_name = \
2125 __ATTR(_name,_mode,_show,_store)
2128 * iSCSI connection attrs
2130 #define iscsi_conn_attr_show(param) \
2132 show_conn_param_##param(struct device *dev, \
2133 struct device_attribute *attr, char *buf) \
2135 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2136 struct iscsi_transport *t = conn->transport; \
2137 return t->get_conn_param(conn, param, buf); \
2140 #define iscsi_conn_attr(field, param) \
2141 iscsi_conn_attr_show(param) \
2142 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
2145 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2146 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2147 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2148 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2149 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2150 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2151 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2152 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2153 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2154 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2155 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2157 #define iscsi_conn_ep_attr_show(param) \
2158 static ssize_t show_conn_ep_param_##param(struct device *dev, \
2159 struct device_attribute *attr,\
2162 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2163 struct iscsi_transport *t = conn->transport; \
2164 struct iscsi_endpoint *ep; \
2168 * Need to make sure ep_disconnect does not free the LLD's \
2169 * interconnect resources while we are trying to read them. \
2171 mutex_lock(&conn->ep_mutex); \
2173 if (!ep && t->ep_connect) { \
2174 mutex_unlock(&conn->ep_mutex); \
2179 rc = t->get_ep_param(ep, param, buf); \
2181 rc = t->get_conn_param(conn, param, buf); \
2182 mutex_unlock(&conn->ep_mutex); \
2186 #define iscsi_conn_ep_attr(field, param) \
2187 iscsi_conn_ep_attr_show(param) \
2188 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2189 show_conn_ep_param_##param, NULL);
2191 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2192 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2194 static struct attribute *iscsi_conn_attrs[] = {
2195 &dev_attr_conn_max_recv_dlength.attr,
2196 &dev_attr_conn_max_xmit_dlength.attr,
2197 &dev_attr_conn_header_digest.attr,
2198 &dev_attr_conn_data_digest.attr,
2199 &dev_attr_conn_ifmarker.attr,
2200 &dev_attr_conn_ofmarker.attr,
2201 &dev_attr_conn_address.attr,
2202 &dev_attr_conn_port.attr,
2203 &dev_attr_conn_exp_statsn.attr,
2204 &dev_attr_conn_persistent_address.attr,
2205 &dev_attr_conn_persistent_port.attr,
2206 &dev_attr_conn_ping_tmo.attr,
2207 &dev_attr_conn_recv_tmo.attr,
2211 static mode_t iscsi_conn_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_conn *conn = transport_class_to_conn(cdev);
2216 struct iscsi_transport *t = conn->transport;
2219 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2220 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2221 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2222 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2223 else if (attr == &dev_attr_conn_header_digest.attr)
2224 param = ISCSI_PARAM_HDRDGST_EN;
2225 else if (attr == &dev_attr_conn_data_digest.attr)
2226 param = ISCSI_PARAM_DATADGST_EN;
2227 else if (attr == &dev_attr_conn_ifmarker.attr)
2228 param = ISCSI_PARAM_IFMARKER_EN;
2229 else if (attr == &dev_attr_conn_ofmarker.attr)
2230 param = ISCSI_PARAM_OFMARKER_EN;
2231 else if (attr == &dev_attr_conn_address.attr)
2232 param = ISCSI_PARAM_CONN_ADDRESS;
2233 else if (attr == &dev_attr_conn_port.attr)
2234 param = ISCSI_PARAM_CONN_PORT;
2235 else if (attr == &dev_attr_conn_exp_statsn.attr)
2236 param = ISCSI_PARAM_EXP_STATSN;
2237 else if (attr == &dev_attr_conn_persistent_address.attr)
2238 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2239 else if (attr == &dev_attr_conn_persistent_port.attr)
2240 param = ISCSI_PARAM_PERSISTENT_PORT;
2241 else if (attr == &dev_attr_conn_ping_tmo.attr)
2242 param = ISCSI_PARAM_PING_TMO;
2243 else if (attr == &dev_attr_conn_recv_tmo.attr)
2244 param = ISCSI_PARAM_RECV_TMO;
2246 WARN_ONCE(1, "Invalid conn attr");
2250 return t->attr_is_visible(ISCSI_PARAM, param);
2253 static struct attribute_group iscsi_conn_group = {
2254 .attrs = iscsi_conn_attrs,
2255 .is_visible = iscsi_conn_attr_is_visible,
2259 * iSCSI session attrs
2261 #define iscsi_session_attr_show(param, perm) \
2263 show_session_param_##param(struct device *dev, \
2264 struct device_attribute *attr, char *buf) \
2266 struct iscsi_cls_session *session = \
2267 iscsi_dev_to_session(dev->parent); \
2268 struct iscsi_transport *t = session->transport; \
2270 if (perm && !capable(CAP_SYS_ADMIN)) \
2272 return t->get_session_param(session, param, buf); \
2275 #define iscsi_session_attr(field, param, perm) \
2276 iscsi_session_attr_show(param, perm) \
2277 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2279 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2280 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2281 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2282 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2283 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2284 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2285 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2286 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2287 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2288 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2289 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2290 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2291 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2292 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2293 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2294 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2295 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2296 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2297 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2298 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2299 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2302 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2305 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2306 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2308 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2311 #define iscsi_priv_session_attr_show(field, format) \
2313 show_priv_session_##field(struct device *dev, \
2314 struct device_attribute *attr, char *buf) \
2316 struct iscsi_cls_session *session = \
2317 iscsi_dev_to_session(dev->parent); \
2318 if (session->field == -1) \
2319 return sprintf(buf, "off\n"); \
2320 return sprintf(buf, format"\n", session->field); \
2323 #define iscsi_priv_session_attr_store(field) \
2325 store_priv_session_##field(struct device *dev, \
2326 struct device_attribute *attr, \
2327 const char *buf, size_t count) \
2331 struct iscsi_cls_session *session = \
2332 iscsi_dev_to_session(dev->parent); \
2333 if ((session->state == ISCSI_SESSION_FREE) || \
2334 (session->state == ISCSI_SESSION_FAILED)) \
2336 if (strncmp(buf, "off", 3) == 0) \
2337 session->field = -1; \
2339 val = simple_strtoul(buf, &cp, 0); \
2340 if (*cp != '\0' && *cp != '\n') \
2342 session->field = val; \
2347 #define iscsi_priv_session_rw_attr(field, format) \
2348 iscsi_priv_session_attr_show(field, format) \
2349 iscsi_priv_session_attr_store(field) \
2350 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
2351 show_priv_session_##field, \
2352 store_priv_session_##field)
2353 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2355 static struct attribute *iscsi_session_attrs[] = {
2356 &dev_attr_sess_initial_r2t.attr,
2357 &dev_attr_sess_max_outstanding_r2t.attr,
2358 &dev_attr_sess_immediate_data.attr,
2359 &dev_attr_sess_first_burst_len.attr,
2360 &dev_attr_sess_max_burst_len.attr,
2361 &dev_attr_sess_data_pdu_in_order.attr,
2362 &dev_attr_sess_data_seq_in_order.attr,
2363 &dev_attr_sess_erl.attr,
2364 &dev_attr_sess_targetname.attr,
2365 &dev_attr_sess_tpgt.attr,
2366 &dev_attr_sess_password.attr,
2367 &dev_attr_sess_password_in.attr,
2368 &dev_attr_sess_username.attr,
2369 &dev_attr_sess_username_in.attr,
2370 &dev_attr_sess_fast_abort.attr,
2371 &dev_attr_sess_abort_tmo.attr,
2372 &dev_attr_sess_lu_reset_tmo.attr,
2373 &dev_attr_sess_tgt_reset_tmo.attr,
2374 &dev_attr_sess_ifacename.attr,
2375 &dev_attr_sess_initiatorname.attr,
2376 &dev_attr_sess_targetalias.attr,
2377 &dev_attr_priv_sess_recovery_tmo.attr,
2378 &dev_attr_priv_sess_state.attr,
2382 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2383 struct attribute *attr, int i)
2385 struct device *cdev = container_of(kobj, struct device, kobj);
2386 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2387 struct iscsi_transport *t = session->transport;
2390 if (attr == &dev_attr_sess_initial_r2t.attr)
2391 param = ISCSI_PARAM_INITIAL_R2T_EN;
2392 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2393 param = ISCSI_PARAM_MAX_R2T;
2394 else if (attr == &dev_attr_sess_immediate_data.attr)
2395 param = ISCSI_PARAM_IMM_DATA_EN;
2396 else if (attr == &dev_attr_sess_first_burst_len.attr)
2397 param = ISCSI_PARAM_FIRST_BURST;
2398 else if (attr == &dev_attr_sess_max_burst_len.attr)
2399 param = ISCSI_PARAM_MAX_BURST;
2400 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2401 param = ISCSI_PARAM_PDU_INORDER_EN;
2402 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2403 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2404 else if (attr == &dev_attr_sess_erl.attr)
2405 param = ISCSI_PARAM_ERL;
2406 else if (attr == &dev_attr_sess_targetname.attr)
2407 param = ISCSI_PARAM_TARGET_NAME;
2408 else if (attr == &dev_attr_sess_tpgt.attr)
2409 param = ISCSI_PARAM_TPGT;
2410 else if (attr == &dev_attr_sess_password.attr)
2411 param = ISCSI_PARAM_USERNAME;
2412 else if (attr == &dev_attr_sess_password_in.attr)
2413 param = ISCSI_PARAM_USERNAME_IN;
2414 else if (attr == &dev_attr_sess_username.attr)
2415 param = ISCSI_PARAM_PASSWORD;
2416 else if (attr == &dev_attr_sess_username_in.attr)
2417 param = ISCSI_PARAM_PASSWORD_IN;
2418 else if (attr == &dev_attr_sess_fast_abort.attr)
2419 param = ISCSI_PARAM_FAST_ABORT;
2420 else if (attr == &dev_attr_sess_abort_tmo.attr)
2421 param = ISCSI_PARAM_ABORT_TMO;
2422 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2423 param = ISCSI_PARAM_LU_RESET_TMO;
2424 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2425 param = ISCSI_PARAM_TGT_RESET_TMO;
2426 else if (attr == &dev_attr_sess_ifacename.attr)
2427 param = ISCSI_PARAM_IFACE_NAME;
2428 else if (attr == &dev_attr_sess_initiatorname.attr)
2429 param = ISCSI_PARAM_INITIATOR_NAME;
2430 else if (attr == &dev_attr_sess_targetalias.attr)
2431 param = ISCSI_PARAM_TARGET_ALIAS;
2432 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2433 return S_IRUGO | S_IWUSR;
2434 else if (attr == &dev_attr_priv_sess_state.attr)
2437 WARN_ONCE(1, "Invalid session attr");
2441 return t->attr_is_visible(ISCSI_PARAM, param);
2444 static struct attribute_group iscsi_session_group = {
2445 .attrs = iscsi_session_attrs,
2446 .is_visible = iscsi_session_attr_is_visible,
2452 #define iscsi_host_attr_show(param) \
2454 show_host_param_##param(struct device *dev, \
2455 struct device_attribute *attr, char *buf) \
2457 struct Scsi_Host *shost = transport_class_to_shost(dev); \
2458 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2459 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2462 #define iscsi_host_attr(field, param) \
2463 iscsi_host_attr_show(param) \
2464 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2467 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2468 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2469 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2470 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2472 static struct attribute *iscsi_host_attrs[] = {
2473 &dev_attr_host_netdev.attr,
2474 &dev_attr_host_hwaddress.attr,
2475 &dev_attr_host_ipaddress.attr,
2476 &dev_attr_host_initiatorname.attr,
2480 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2481 struct attribute *attr, int i)
2483 struct device *cdev = container_of(kobj, struct device, kobj);
2484 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2485 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2488 if (attr == &dev_attr_host_netdev.attr)
2489 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2490 else if (attr == &dev_attr_host_hwaddress.attr)
2491 param = ISCSI_HOST_PARAM_HWADDRESS;
2492 else if (attr == &dev_attr_host_ipaddress.attr)
2493 param = ISCSI_HOST_PARAM_IPADDRESS;
2494 else if (attr == &dev_attr_host_initiatorname.attr)
2495 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2497 WARN_ONCE(1, "Invalid host attr");
2501 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2504 static struct attribute_group iscsi_host_group = {
2505 .attrs = iscsi_host_attrs,
2506 .is_visible = iscsi_host_attr_is_visible,
2509 static int iscsi_session_match(struct attribute_container *cont,
2512 struct iscsi_cls_session *session;
2513 struct Scsi_Host *shost;
2514 struct iscsi_internal *priv;
2516 if (!iscsi_is_session_dev(dev))
2519 session = iscsi_dev_to_session(dev);
2520 shost = iscsi_session_to_shost(session);
2521 if (!shost->transportt)
2524 priv = to_iscsi_internal(shost->transportt);
2525 if (priv->session_cont.ac.class != &iscsi_session_class.class)
2528 return &priv->session_cont.ac == cont;
2531 static int iscsi_conn_match(struct attribute_container *cont,
2534 struct iscsi_cls_session *session;
2535 struct iscsi_cls_conn *conn;
2536 struct Scsi_Host *shost;
2537 struct iscsi_internal *priv;
2539 if (!iscsi_is_conn_dev(dev))
2542 conn = iscsi_dev_to_conn(dev);
2543 session = iscsi_dev_to_session(conn->dev.parent);
2544 shost = iscsi_session_to_shost(session);
2546 if (!shost->transportt)
2549 priv = to_iscsi_internal(shost->transportt);
2550 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2553 return &priv->conn_cont.ac == cont;
2556 static int iscsi_host_match(struct attribute_container *cont,
2559 struct Scsi_Host *shost;
2560 struct iscsi_internal *priv;
2562 if (!scsi_is_host_device(dev))
2565 shost = dev_to_shost(dev);
2566 if (!shost->transportt ||
2567 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2570 priv = to_iscsi_internal(shost->transportt);
2571 return &priv->t.host_attrs.ac == cont;
2574 struct scsi_transport_template *
2575 iscsi_register_transport(struct iscsi_transport *tt)
2577 struct iscsi_internal *priv;
2578 unsigned long flags;
2583 priv = iscsi_if_transport_lookup(tt);
2587 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2590 INIT_LIST_HEAD(&priv->list);
2591 priv->iscsi_transport = tt;
2592 priv->t.user_scan = iscsi_user_scan;
2593 priv->t.create_work_queue = 1;
2595 priv->dev.class = &iscsi_transport_class;
2596 dev_set_name(&priv->dev, "%s", tt->name);
2597 err = device_register(&priv->dev);
2601 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2603 goto unregister_dev;
2605 /* host parameters */
2606 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2607 priv->t.host_attrs.ac.match = iscsi_host_match;
2608 priv->t.host_attrs.ac.grp = &iscsi_host_group;
2609 priv->t.host_size = sizeof(struct iscsi_cls_host);
2610 transport_container_register(&priv->t.host_attrs);
2612 /* connection parameters */
2613 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2614 priv->conn_cont.ac.match = iscsi_conn_match;
2615 priv->conn_cont.ac.grp = &iscsi_conn_group;
2616 transport_container_register(&priv->conn_cont);
2618 /* session parameters */
2619 priv->session_cont.ac.class = &iscsi_session_class.class;
2620 priv->session_cont.ac.match = iscsi_session_match;
2621 priv->session_cont.ac.grp = &iscsi_session_group;
2622 transport_container_register(&priv->session_cont);
2624 spin_lock_irqsave(&iscsi_transport_lock, flags);
2625 list_add(&priv->list, &iscsi_transports);
2626 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2628 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2632 device_unregister(&priv->dev);
2638 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2640 int iscsi_unregister_transport(struct iscsi_transport *tt)
2642 struct iscsi_internal *priv;
2643 unsigned long flags;
2647 mutex_lock(&rx_queue_mutex);
2649 priv = iscsi_if_transport_lookup(tt);
2652 spin_lock_irqsave(&iscsi_transport_lock, flags);
2653 list_del(&priv->list);
2654 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2656 transport_container_unregister(&priv->conn_cont);
2657 transport_container_unregister(&priv->session_cont);
2658 transport_container_unregister(&priv->t.host_attrs);
2660 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2661 device_unregister(&priv->dev);
2662 mutex_unlock(&rx_queue_mutex);
2666 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2668 static __init int iscsi_transport_init(void)
2672 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2673 ISCSI_TRANSPORT_VERSION);
2675 atomic_set(&iscsi_session_nr, 0);
2677 err = class_register(&iscsi_transport_class);
2681 err = class_register(&iscsi_endpoint_class);
2683 goto unregister_transport_class;
2685 err = class_register(&iscsi_iface_class);
2687 goto unregister_endpoint_class;
2689 err = transport_class_register(&iscsi_host_class);
2691 goto unregister_iface_class;
2693 err = transport_class_register(&iscsi_connection_class);
2695 goto unregister_host_class;
2697 err = transport_class_register(&iscsi_session_class);
2699 goto unregister_conn_class;
2701 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2705 goto unregister_session_class;
2708 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2709 if (!iscsi_eh_timer_workq)
2715 netlink_kernel_release(nls);
2716 unregister_session_class:
2717 transport_class_unregister(&iscsi_session_class);
2718 unregister_conn_class:
2719 transport_class_unregister(&iscsi_connection_class);
2720 unregister_host_class:
2721 transport_class_unregister(&iscsi_host_class);
2722 unregister_iface_class:
2723 class_unregister(&iscsi_iface_class);
2724 unregister_endpoint_class:
2725 class_unregister(&iscsi_endpoint_class);
2726 unregister_transport_class:
2727 class_unregister(&iscsi_transport_class);
2731 static void __exit iscsi_transport_exit(void)
2733 destroy_workqueue(iscsi_eh_timer_workq);
2734 netlink_kernel_release(nls);
2735 transport_class_unregister(&iscsi_connection_class);
2736 transport_class_unregister(&iscsi_session_class);
2737 transport_class_unregister(&iscsi_host_class);
2738 class_unregister(&iscsi_endpoint_class);
2739 class_unregister(&iscsi_iface_class);
2740 class_unregister(&iscsi_transport_class);
2743 module_init(iscsi_transport_init);
2744 module_exit(iscsi_transport_exit);
2746 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2747 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2748 "Alex Aizman <itn780@yahoo.com>");
2749 MODULE_DESCRIPTION("iSCSI Transport Interface");
2750 MODULE_LICENSE("GPL");
2751 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2752 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);