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[SCSI] iscsi: add high mem support
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / scsi_transport_iscsi.c
CommitLineData
0896b752 1/*
1da177e4
LT		 2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
0896b752
AA		 5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
1da177e4
LT		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23#include <linux/module.h>
4e57b681
TS		 24#include <linux/string.h>
25#include <linux/slab.h>
0896b752 26#include <linux/mempool.h>
0b950672 27#include <linux/mutex.h>
0896b752 28#include <net/tcp.h>
4e57b681 29
1da177e4
LT		 30#include <scsi/scsi.h>
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_transport.h>
34#include <scsi/scsi_transport_iscsi.h>
0896b752 35#include <scsi/iscsi_if.h>
1da177e4 36
0896b752
AA		 37#define ISCSI_SESSION_ATTRS 8
38#define ISCSI_CONN_ATTRS 6
1da177e4
LT		 39
40struct iscsi_internal {
41 struct scsi_transport_template t;
0896b752
AA		 42 struct iscsi_transport *iscsi_transport;
43 struct list_head list;
44 /*
45 * List of sessions for this transport
46 */
47 struct list_head sessions;
48 /*
49 * lock to serialize access to the sessions list which must
0b950672 50 * be taken after the rx_queue_mutex
0896b752
AA		 51 */
52 spinlock_t session_lock;
53 /*
54 * based on transport capabilities, at register time we set these
55 * bits to tell the transport class it wants attributes displayed
56 * in sysfs or that it can support different iSCSI Data-Path
57 * capabilities
58 */
59 uint32_t param_mask;
60
61 struct class_device cdev;
1da177e4
LT		 62 /*
63 * We do not have any private or other attrs.
64 */
0896b752
AA		 65 struct transport_container conn_cont;
66 struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
67 struct transport_container session_cont;
1da177e4 68 struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
1da177e4
LT		 69};
70
0896b752
AA		 71/*
72 * list of registered transports and lock that must
73 * be held while accessing list. The iscsi_transport_lock must
0b950672 74 * be acquired after the rx_queue_mutex.
0896b752
AA		 75 */
76static LIST_HEAD(iscsi_transports);
77static DEFINE_SPINLOCK(iscsi_transport_lock);
78
79#define to_iscsi_internal(tmpl) \
80 container_of(tmpl, struct iscsi_internal, t)
81
82#define cdev_to_iscsi_internal(_cdev) \
83 container_of(_cdev, struct iscsi_internal, cdev)
84
85static void iscsi_transport_release(struct class_device *cdev)
86{
87 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
88 kfree(priv);
89}
1da177e4 90
0896b752
AA		 91/*
92 * iscsi_transport_class represents the iscsi_transports that are
93 * registered.
94 */
95static struct class iscsi_transport_class = {
96 .name = "iscsi_transport",
97 .release = iscsi_transport_release,
98};
99
100static ssize_t
101show_transport_handle(struct class_device *cdev, char *buf)
102{
103 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
762e2bfa 104 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752
AA		 105}
106static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
107
108#define show_transport_attr(name, format) \
109static ssize_t \
110show_transport_##name(struct class_device *cdev, char *buf) \
111{ \
112 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
113 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
114} \
115static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
116
117show_transport_attr(caps, "0x%x");
118show_transport_attr(max_lun, "%d");
119show_transport_attr(max_conn, "%d");
120show_transport_attr(max_cmd_len, "%d");
121
122static struct attribute *iscsi_transport_attrs[] = {
123 &class_device_attr_handle.attr,
124 &class_device_attr_caps.attr,
125 &class_device_attr_max_lun.attr,
126 &class_device_attr_max_conn.attr,
127 &class_device_attr_max_cmd_len.attr,
128 NULL,
129};
130
131static struct attribute_group iscsi_transport_group = {
132 .attrs = iscsi_transport_attrs,
133};
134
135static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
136 "iscsi_session",
1da177e4
LT		 137 NULL,
138 NULL,
139 NULL);
140
0896b752
AA		 141static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
142 "iscsi_connection",
1da177e4
LT		 143 NULL,
144 NULL,
145 NULL);
0896b752
AA		 146
147static struct sock *nls;
148static int daemon_pid;
0b950672 149static DEFINE_MUTEX(rx_queue_mutex);
0896b752
AA		 150
151struct mempool_zone {
152 mempool_t *pool;
153 atomic_t allocated;
154 int size;
155 int hiwat;
156 struct list_head freequeue;
157 spinlock_t freelock;
158};
159
160static struct mempool_zone z_reply;
161
1da177e4 162/*
0896b752
AA		 163 * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
164 * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
165 * so daemon will notice OOM on NETLINK tranposrt level and will
166 * be able to predict or change operational behavior
1da177e4 167 */
0896b752
AA		 168#define Z_MAX_REPLY 8
169#define Z_HIWAT_REPLY 6
170#define Z_MAX_PDU 8
171#define Z_HIWAT_PDU 6
172#define Z_MAX_ERROR 16
173#define Z_HIWAT_ERROR 12
174
175struct iscsi_if_conn {
176 struct list_head conn_list; /* item in connlist */
177 struct list_head session_list; /* item in session->connections */
178 iscsi_connh_t connh;
179 int active; /* must be accessed with the connlock */
180 struct Scsi_Host *host; /* originated shost */
181 struct device dev; /* sysfs transport/container device */
182 struct iscsi_transport *transport;
183 struct mempool_zone z_error;
184 struct mempool_zone z_pdu;
185 struct list_head freequeue;
186};
187
188#define iscsi_dev_to_if_conn(_dev) \
189 container_of(_dev, struct iscsi_if_conn, dev)
190
191#define iscsi_cdev_to_if_conn(_cdev) \
192 iscsi_dev_to_if_conn(_cdev->dev)
193
194static LIST_HEAD(connlist);
195static DEFINE_SPINLOCK(connlock);
196
197struct iscsi_if_session {
198 struct list_head list; /* item in session_list */
199 struct list_head connections;
200 iscsi_sessionh_t sessionh;
201 struct iscsi_transport *transport;
202 struct device dev; /* sysfs transport/container device */
203};
204
205#define iscsi_dev_to_if_session(_dev) \
206 container_of(_dev, struct iscsi_if_session, dev)
207
208#define iscsi_cdev_to_if_session(_cdev) \
209 iscsi_dev_to_if_session(_cdev->dev)
210
211#define iscsi_if_session_to_shost(_session) \
212 dev_to_shost(_session->dev.parent)
213
214static struct iscsi_if_conn*
215iscsi_if_find_conn(uint64_t key)
216{
217 unsigned long flags;
218 struct iscsi_if_conn *conn;
219
220 spin_lock_irqsave(&connlock, flags);
221 list_for_each_entry(conn, &connlist, conn_list)
222 if (conn->connh == key) {
223 spin_unlock_irqrestore(&connlock, flags);
224 return conn;
225 }
226 spin_unlock_irqrestore(&connlock, flags);
227 return NULL;
1da177e4
LT		 228}
229
0896b752
AA		 230static struct iscsi_internal *
231iscsi_if_transport_lookup(struct iscsi_transport *tt)
232{
233 struct iscsi_internal *priv;
234 unsigned long flags;
235
236 spin_lock_irqsave(&iscsi_transport_lock, flags);
237 list_for_each_entry(priv, &iscsi_transports, list) {
238 if (tt == priv->iscsi_transport) {
239 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
240 return priv;
241 }
242 }
243 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
244 return NULL;
245}
1da177e4 246
0896b752
AA		 247static inline struct list_head *skb_to_lh(struct sk_buff *skb)
248{
249 return (struct list_head *)&skb->cb;
250}
1da177e4 251
0896b752 252static void*
b53cb2a4 253mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
0896b752
AA		 254{
255 struct mempool_zone *zone = pool_data;
1da177e4 256
0896b752 257 return alloc_skb(zone->size, gfp_mask);
1da177e4
LT		 258}
259
0896b752
AA		 260static void
261mempool_zone_free_skb(void *element, void *pool_data)
262{
263 kfree_skb(element);
264}
1da177e4 265
0896b752
AA		 266static void
267mempool_zone_complete(struct mempool_zone *zone)
268{
269 unsigned long flags;
270 struct list_head *lh, *n;
1da177e4 271
0896b752
AA		 272 spin_lock_irqsave(&zone->freelock, flags);
273 list_for_each_safe(lh, n, &zone->freequeue) {
274 struct sk_buff *skb = (struct sk_buff *)((char *)lh -
275 offsetof(struct sk_buff, cb));
276 if (!skb_shared(skb)) {
277 list_del(skb_to_lh(skb));
278 mempool_free(skb, zone->pool);
279 atomic_dec(&zone->allocated);
280 }
281 }
282 spin_unlock_irqrestore(&zone->freelock, flags);
1da177e4
LT		 283}
284
0896b752
AA		 285static int
286mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size,
287 unsigned hiwat)
288{
289 zp->pool = mempool_create(max, mempool_zone_alloc_skb,
290 mempool_zone_free_skb, zp);
291 if (!zp->pool)
292 return -ENOMEM;
1da177e4 293
0896b752
AA		 294 zp->size = size;
295 zp->hiwat = hiwat;
1da177e4 296
0896b752
AA		 297 INIT_LIST_HEAD(&zp->freequeue);
298 spin_lock_init(&zp->freelock);
299 atomic_set(&zp->allocated, 0);
300
301 return 0;
302}
303
304
305static struct sk_buff*
306mempool_zone_get_skb(struct mempool_zone *zone)
1da177e4 307{
0896b752
AA		 308 struct sk_buff *skb;
309
310 skb = mempool_alloc(zone->pool, GFP_ATOMIC);
311 if (skb)
312 atomic_inc(&zone->allocated);
313 return skb;
314}
1da177e4 315
0896b752
AA		 316static int
317iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
318{
319 unsigned long flags;
320 int rc;
1da177e4 321
0896b752
AA		 322 skb_get(skb);
323 rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
324 if (rc < 0) {
325 mempool_free(skb, zone->pool);
326 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
327 return rc;
328 }
329
330 spin_lock_irqsave(&zone->freelock, flags);
331 list_add(skb_to_lh(skb), &zone->freequeue);
332 spin_unlock_irqrestore(&zone->freelock, flags);
333
334 return 0;
1da177e4 335}
1da177e4 336
0896b752
AA		 337int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr,
338 char *data, uint32_t data_size)
1da177e4 339{
0896b752
AA		 340 struct nlmsghdr *nlh;
341 struct sk_buff *skb;
342 struct iscsi_uevent *ev;
343 struct iscsi_if_conn *conn;
344 char *pdu;
345 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
346 data_size);
347
348 conn = iscsi_if_find_conn(connh);
349 BUG_ON(!conn);
350
351 mempool_zone_complete(&conn->z_pdu);
352
353 skb = mempool_zone_get_skb(&conn->z_pdu);
354 if (!skb) {
355 iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED);
356 printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n",
357 conn->host->host_no);
358 return -ENOMEM;
359 }
1da177e4 360
0896b752
AA		 361 nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
362 ev = NLMSG_DATA(nlh);
363 memset(ev, 0, sizeof(*ev));
364 ev->transport_handle = iscsi_handle(conn->transport);
365 ev->type = ISCSI_KEVENT_RECV_PDU;
366 if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
367 ev->iferror = -ENOMEM;
368 ev->r.recv_req.conn_handle = connh;
369 pdu = (char*)ev + sizeof(*ev);
370 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
371 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 372
0896b752 373 return iscsi_unicast_skb(&conn->z_pdu, skb);
1da177e4 374}
0896b752 375EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 376
0896b752 377void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error)
1da177e4 378{
0896b752
AA		 379 struct nlmsghdr *nlh;
380 struct sk_buff *skb;
381 struct iscsi_uevent *ev;
382 struct iscsi_if_conn *conn;
383 int len = NLMSG_SPACE(sizeof(*ev));
384
385 conn = iscsi_if_find_conn(connh);
386 BUG_ON(!conn);
387
388 mempool_zone_complete(&conn->z_error);
389
390 skb = mempool_zone_get_skb(&conn->z_error);
391 if (!skb) {
392 printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n",
393 conn->host->host_no, error);
394 return;
395 }
396
397 nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
398 ev = NLMSG_DATA(nlh);
399 ev->transport_handle = iscsi_handle(conn->transport);
400 ev->type = ISCSI_KEVENT_CONN_ERROR;
401 if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat)
402 ev->iferror = -ENOMEM;
403 ev->r.connerror.error = error;
404 ev->r.connerror.conn_handle = connh;
1da177e4 405
0896b752 406 iscsi_unicast_skb(&conn->z_error, skb);
1da177e4 407
0896b752
AA		 408 printk(KERN_INFO "iscsi%d: detected conn error (%d)\n",
409 conn->host->host_no, error);
410}
411EXPORT_SYMBOL_GPL(iscsi_conn_error);
412
413static int
414iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
415 void *payload, int size)
416{
417 struct sk_buff *skb;
418 struct nlmsghdr *nlh;
419 int len = NLMSG_SPACE(size);
420 int flags = multi ? NLM_F_MULTI : 0;
421 int t = done ? NLMSG_DONE : type;
422
423 mempool_zone_complete(&z_reply);
424
425 skb = mempool_zone_get_skb(&z_reply);
426 /*
427 * FIXME:
428 * user is supposed to react on iferror == -ENOMEM;
429 * see iscsi_if_rx().
430 */
431 BUG_ON(!skb);
432
433 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
434 nlh->nlmsg_flags = flags;
435 memcpy(NLMSG_DATA(nlh), payload, size);
436 return iscsi_unicast_skb(&z_reply, skb);
1da177e4 437}
1da177e4
LT		 438
439/*
0896b752
AA		 440 * iSCSI Session's hostdata organization:
441 *
442 * *------------------* <== host->hostdata
443 * | transport |
444 * |------------------| <== iscsi_hostdata(host->hostdata)
445 * | transport's data |
446 * |------------------| <== hostdata_session(host->hostdata)
447 * | interface's data |
448 * *------------------*
1da177e4 449 */
0896b752
AA		 450
451#define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
452 _t->hostdata_size % sizeof(unsigned long) + \
453 sizeof(struct iscsi_if_session))
454
455#define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \
456 ((struct iscsi_transport *) \
457 iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size)
458
459static void iscsi_if_session_dev_release(struct device *dev)
460{
461 struct iscsi_if_session *session = iscsi_dev_to_if_session(dev);
462 struct iscsi_transport *transport = session->transport;
463 struct Scsi_Host *shost = iscsi_if_session_to_shost(session);
464 struct iscsi_if_conn *conn, *tmp;
465 unsigned long flags;
466
467 /* now free connections */
468 spin_lock_irqsave(&connlock, flags);
469 list_for_each_entry_safe(conn, tmp, &session->connections,
470 session_list) {
471 list_del(&conn->session_list);
472 mempool_destroy(conn->z_pdu.pool);
473 mempool_destroy(conn->z_error.pool);
474 kfree(conn);
475 }
476 spin_unlock_irqrestore(&connlock, flags);
477 scsi_host_put(shost);
478 module_put(transport->owner);
479}
480
481static int
482iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
483{
484 struct iscsi_transport *transport = priv->iscsi_transport;
485 struct iscsi_if_session *session;
486 struct Scsi_Host *shost;
487 unsigned long flags;
488 int error;
489
490 if (!try_module_get(transport->owner))
491 return -EPERM;
492
493 shost = scsi_host_alloc(transport->host_template,
494 hostdata_privsize(transport));
495 if (!shost) {
496 ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
497 printk(KERN_ERR "iscsi: can not allocate SCSI host for "
498 "session\n");
499 error = -ENOMEM;
500 goto out_module_put;
501 }
502 shost->max_id = 1;
503 shost->max_channel = 0;
504 shost->max_lun = transport->max_lun;
505 shost->max_cmd_len = transport->max_cmd_len;
506 shost->transportt = &priv->t;
507
508 /* store struct iscsi_transport in hostdata */
509 *(uint64_t*)shost->hostdata = ev->transport_handle;
510
511 ev->r.c_session_ret.session_handle = transport->create_session(
512 ev->u.c_session.initial_cmdsn, shost);
513 if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) {
514 error = 0;
515 goto out_host_put;
516 }
517
518 /* host_no becomes assigned SID */
519 ev->r.c_session_ret.sid = shost->host_no;
520 /* initialize session */
521 session = hostdata_session(shost->hostdata);
522 INIT_LIST_HEAD(&session->connections);
523 INIT_LIST_HEAD(&session->list);
524 session->sessionh = ev->r.c_session_ret.session_handle;
525 session->transport = transport;
526
527 error = scsi_add_host(shost, NULL);
528 if (error)
529 goto out_destroy_session;
530
531 /*
532 * this is released in the dev's release function)
533 */
534 scsi_host_get(shost);
535 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no);
536 session->dev.parent = &shost->shost_gendev;
537 session->dev.release = iscsi_if_session_dev_release;
538 error = device_register(&session->dev);
539 if (error) {
540 printk(KERN_ERR "iscsi: could not register session%d's dev\n",
541 shost->host_no);
542 goto out_remove_host;
543 }
544 transport_register_device(&session->dev);
545
546 /* add this session to the list of active sessions */
547 spin_lock_irqsave(&priv->session_lock, flags);
548 list_add(&session->list, &priv->sessions);
549 spin_unlock_irqrestore(&priv->session_lock, flags);
550
551 return 0;
552
553out_remove_host:
554 scsi_remove_host(shost);
555out_destroy_session:
556 transport->destroy_session(ev->r.c_session_ret.session_handle);
557 ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
558out_host_put:
559 scsi_host_put(shost);
560out_module_put:
561 module_put(transport->owner);
562 return error;
563}
564
565static int
566iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
567{
568 struct iscsi_transport *transport = priv->iscsi_transport;
569 struct Scsi_Host *shost;
570 struct iscsi_if_session *session;
571 unsigned long flags;
572 struct iscsi_if_conn *conn;
573 int error = 0;
574
575 shost = scsi_host_lookup(ev->u.d_session.sid);
576 if (shost == ERR_PTR(-ENXIO))
577 return -EEXIST;
578 session = hostdata_session(shost->hostdata);
579
580 /* check if we have active connections */
581 spin_lock_irqsave(&connlock, flags);
582 list_for_each_entry(conn, &session->connections, session_list) {
583 if (conn->active) {
584 printk(KERN_ERR "iscsi%d: can not destroy session: "
585 "has active connection (%p)\n",
586 shost->host_no, iscsi_ptr(conn->connh));
587 spin_unlock_irqrestore(&connlock, flags);
588 error = EIO;
589 goto out_release_ref;
590 }
591 }
592 spin_unlock_irqrestore(&connlock, flags);
593
594 scsi_remove_host(shost);
595 transport->destroy_session(ev->u.d_session.session_handle);
596 transport_unregister_device(&session->dev);
597 device_unregister(&session->dev);
598
599 /* remove this session from the list of active sessions */
600 spin_lock_irqsave(&priv->session_lock, flags);
601 list_del(&session->list);
602 spin_unlock_irqrestore(&priv->session_lock, flags);
603
604 /* ref from host alloc */
605 scsi_host_put(shost);
606out_release_ref:
607 /* ref from host lookup */
608 scsi_host_put(shost);
609 return error;
610}
611
612static void iscsi_if_conn_dev_release(struct device *dev)
613{
614 struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev);
615 struct Scsi_Host *shost = conn->host;
616
617 scsi_host_put(shost);
618}
619
620static int
621iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
622{
623 struct iscsi_if_session *session;
624 struct Scsi_Host *shost;
625 struct iscsi_if_conn *conn;
626 unsigned long flags;
627 int error;
628
629 shost = scsi_host_lookup(ev->u.c_conn.sid);
630 if (shost == ERR_PTR(-ENXIO))
631 return -EEXIST;
632 session = hostdata_session(shost->hostdata);
633
634 conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL);
635 if (!conn) {
636 error = -ENOMEM;
637 goto out_release_ref;
638 }
639 memset(conn, 0, sizeof(struct iscsi_if_conn));
640 INIT_LIST_HEAD(&conn->session_list);
641 INIT_LIST_HEAD(&conn->conn_list);
642 conn->host = shost;
643 conn->transport = transport;
644
645 error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU,
646 NLMSG_SPACE(sizeof(struct iscsi_uevent) +
647 sizeof(struct iscsi_hdr) +
648 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
649 Z_HIWAT_PDU);
650 if (error) {
651 printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new "
652 "conn\n", shost->host_no);
653 goto out_free_conn;
654 }
655 error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR,
656 NLMSG_SPACE(sizeof(struct iscsi_uevent)),
657 Z_HIWAT_ERROR);
658 if (error) {
659 printk(KERN_ERR "iscsi%d: can not allocate error zone for "
660 "new conn\n", shost->host_no);
661 goto out_free_pdu_pool;
662 }
663
664 ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle,
665 ev->u.c_conn.cid);
666 if (!ev->r.handle) {
667 error = -ENODEV;
668 goto out_free_error_pool;
669 }
670
671 conn->connh = ev->r.handle;
672
673 /*
674 * this is released in the dev's release function
675 */
676 if (!scsi_host_get(shost))
677 goto out_destroy_conn;
678 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
679 shost->host_no, ev->u.c_conn.cid);
680 conn->dev.parent = &session->dev;
681 conn->dev.release = iscsi_if_conn_dev_release;
682 error = device_register(&conn->dev);
683 if (error) {
684 printk(KERN_ERR "iscsi%d: could not register connections%u "
685 "dev\n", shost->host_no, ev->u.c_conn.cid);
686 goto out_release_parent_ref;
687 }
688 transport_register_device(&conn->dev);
689
690 spin_lock_irqsave(&connlock, flags);
691 list_add(&conn->conn_list, &connlist);
692 list_add(&conn->session_list, &session->connections);
693 conn->active = 1;
694 spin_unlock_irqrestore(&connlock, flags);
695
696 scsi_host_put(shost);
697 return 0;
698
699out_release_parent_ref:
700 scsi_host_put(shost);
701out_destroy_conn:
702 transport->destroy_conn(ev->r.handle);
703out_free_error_pool:
704 mempool_destroy(conn->z_error.pool);
705out_free_pdu_pool:
706 mempool_destroy(conn->z_pdu.pool);
707out_free_conn:
708 kfree(conn);
709out_release_ref:
710 scsi_host_put(shost);
711 return error;
1da177e4
LT		 712}
713
0896b752
AA		 714static int
715iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
716{
717 unsigned long flags;
718 struct iscsi_if_conn *conn;
719
720 conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle);
721 if (!conn)
722 return -EEXIST;
723
724 transport->destroy_conn(ev->u.d_conn.conn_handle);
725
726 spin_lock_irqsave(&connlock, flags);
727 conn->active = 0;
728 list_del(&conn->conn_list);
729 spin_unlock_irqrestore(&connlock, flags);
730
731 transport_unregister_device(&conn->dev);
732 device_unregister(&conn->dev);
733 return 0;
734}
735
736static int
737iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
738 struct nlmsghdr *nlh)
739{
740 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
741 struct iscsi_stats *stats;
742 struct sk_buff *skbstat;
743 struct iscsi_if_conn *conn;
744 struct nlmsghdr *nlhstat;
745 struct iscsi_uevent *evstat;
746 int len = NLMSG_SPACE(sizeof(*ev) +
747 sizeof(struct iscsi_stats) +
748 sizeof(struct iscsi_stats_custom) *
749 ISCSI_STATS_CUSTOM_MAX);
750 int err = 0;
751
752 conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle);
753 if (!conn)
754 return -EEXIST;
755
756 do {
757 int actual_size;
758
759 mempool_zone_complete(&conn->z_pdu);
760
761 skbstat = mempool_zone_get_skb(&conn->z_pdu);
762 if (!skbstat) {
763 printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n",
764 conn->host->host_no);
765 return -ENOMEM;
766 }
767
768 nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0,
769 (len - sizeof(*nlhstat)), 0);
770 evstat = NLMSG_DATA(nlhstat);
771 memset(evstat, 0, sizeof(*evstat));
772 evstat->transport_handle = iscsi_handle(conn->transport);
773 evstat->type = nlh->nlmsg_type;
774 if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
775 evstat->iferror = -ENOMEM;
776 evstat->u.get_stats.conn_handle =
777 ev->u.get_stats.conn_handle;
778 stats = (struct iscsi_stats *)
779 ((char*)evstat + sizeof(*evstat));
780 memset(stats, 0, sizeof(*stats));
781
782 transport->get_stats(ev->u.get_stats.conn_handle, stats);
783 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
784 sizeof(struct iscsi_stats) +
785 sizeof(struct iscsi_stats_custom) *
786 stats->custom_length);
787 actual_size -= sizeof(*nlhstat);
788 actual_size = NLMSG_LENGTH(actual_size);
789 skb_trim(skb, NLMSG_ALIGN(actual_size));
790 nlhstat->nlmsg_len = actual_size;
791
792 err = iscsi_unicast_skb(&conn->z_pdu, skbstat);
793 } while (err < 0 && err != -ECONNREFUSED);
794
795 return err;
796}
797
798static int
799iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
800{
801 int err = 0;
802 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
803 struct iscsi_transport *transport = NULL;
804 struct iscsi_internal *priv;
805
806 if (NETLINK_CREDS(skb)->uid)
807 return -EPERM;
808
809 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
810 if (!priv)
811 return -EINVAL;
812 transport = priv->iscsi_transport;
813
814 daemon_pid = NETLINK_CREDS(skb)->pid;
815
816 switch (nlh->nlmsg_type) {
817 case ISCSI_UEVENT_CREATE_SESSION:
818 err = iscsi_if_create_session(priv, ev);
819 break;
820 case ISCSI_UEVENT_DESTROY_SESSION:
821 err = iscsi_if_destroy_session(priv, ev);
822 break;
823 case ISCSI_UEVENT_CREATE_CONN:
824 err = iscsi_if_create_conn(transport, ev);
825 break;
826 case ISCSI_UEVENT_DESTROY_CONN:
827 err = iscsi_if_destroy_conn(transport, ev);
828 break;
829 case ISCSI_UEVENT_BIND_CONN:
830 if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle))
831 return -EEXIST;
832 ev->r.retcode = transport->bind_conn(
833 ev->u.b_conn.session_handle,
834 ev->u.b_conn.conn_handle,
835 ev->u.b_conn.transport_fd,
836 ev->u.b_conn.is_leading);
837 break;
838 case ISCSI_UEVENT_SET_PARAM:
839 if (!iscsi_if_find_conn(ev->u.set_param.conn_handle))
840 return -EEXIST;
841 ev->r.retcode = transport->set_param(
842 ev->u.set_param.conn_handle,
843 ev->u.set_param.param, ev->u.set_param.value);
844 break;
845 case ISCSI_UEVENT_START_CONN:
846 if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle))
847 return -EEXIST;
848 ev->r.retcode = transport->start_conn(
849 ev->u.start_conn.conn_handle);
850 break;
851 case ISCSI_UEVENT_STOP_CONN:
852 if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle))
853 return -EEXIST;
854 transport->stop_conn(ev->u.stop_conn.conn_handle,
855 ev->u.stop_conn.flag);
856 break;
857 case ISCSI_UEVENT_SEND_PDU:
858 if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle))
859 return -EEXIST;
860 ev->r.retcode = transport->send_pdu(
861 ev->u.send_pdu.conn_handle,
862 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
863 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
864 ev->u.send_pdu.data_size);
865 break;
866 case ISCSI_UEVENT_GET_STATS:
867 err = iscsi_if_get_stats(transport, skb, nlh);
868 break;
869 default:
870 err = -EINVAL;
871 break;
872 }
873
874 return err;
875}
876
877/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
878 * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
879 * discarded silently. */
880static void
881iscsi_if_rx(struct sock *sk, int len)
882{
883 struct sk_buff *skb;
1da177e4 884
0b950672 885 mutex_lock(&rx_queue_mutex);
0896b752
AA		 886 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
887 while (skb->len >= NLMSG_SPACE(0)) {
888 int err;
889 uint32_t rlen;
890 struct nlmsghdr *nlh;
891 struct iscsi_uevent *ev;
892
893 nlh = (struct nlmsghdr *)skb->data;
894 if (nlh->nlmsg_len < sizeof(*nlh) ||
895 skb->len < nlh->nlmsg_len) {
896 break;
897 }
898 ev = NLMSG_DATA(nlh);
899 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
900 if (rlen > skb->len)
901 rlen = skb->len;
902 err = iscsi_if_recv_msg(skb, nlh);
903 if (err) {
904 ev->type = ISCSI_KEVENT_IF_ERROR;
905 ev->iferror = err;
906 }
907 do {
908 /*
909 * special case for GET_STATS:
910 * on success - sending reply and stats from
911 * inside of if_recv_msg(),
912 * on error - fall through.
913 */
914 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
915 break;
916 err = iscsi_if_send_reply(
917 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
918 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
919 if (atomic_read(&z_reply.allocated) >=
920 z_reply.hiwat)
921 ev->iferror = -ENOMEM;
922 } while (err < 0 && err != -ECONNREFUSED);
923 skb_pull(skb, rlen);
924 }
925 kfree_skb(skb);
926 }
0b950672 927 mutex_unlock(&rx_queue_mutex);
0896b752 928}
1da177e4
LT		 929
930/*
0896b752 931 * iSCSI connection attrs
1da177e4 932 */
0896b752
AA		 933#define iscsi_conn_int_attr_show(param, format) \
934static ssize_t \
935show_conn_int_param_##param(struct class_device *cdev, char *buf) \
936{ \
937 uint32_t value = 0; \
938 struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \
939 struct iscsi_internal *priv; \
940 \
941 priv = to_iscsi_internal(conn->host->transportt); \
942 if (priv->param_mask & (1 << param)) \
943 priv->iscsi_transport->get_param(conn->connh, param, &value); \
944 return snprintf(buf, 20, format"\n", value); \
945}
946
947#define iscsi_conn_int_attr(field, param, format) \
948 iscsi_conn_int_attr_show(param, format) \
949static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL);
950
951iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
952iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
953iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
954iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
955iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
956iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");
1da177e4
LT		 957
958/*
0896b752 959 * iSCSI session attrs
1da177e4 960 */
0896b752 961#define iscsi_session_int_attr_show(param, format) \
1da177e4 962static ssize_t \
0896b752 963show_session_int_param_##param(struct class_device *cdev, char *buf) \
1da177e4 964{ \
0896b752
AA		 965 uint32_t value = 0; \
966 struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \
967 struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \
968 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
969 struct iscsi_if_conn *conn = NULL; \
970 unsigned long flags; \
971 \
972 spin_lock_irqsave(&connlock, flags); \
973 if (!list_empty(&session->connections)) \
974 conn = list_entry(session->connections.next, \
975 struct iscsi_if_conn, session_list); \
976 spin_unlock_irqrestore(&connlock, flags); \
1da177e4 977 \
0896b752
AA		 978 if (conn && (priv->param_mask & (1 << param))) \
979 priv->iscsi_transport->get_param(conn->connh, param, &value);\
980 return snprintf(buf, 20, format"\n", value); \
1da177e4
LT		 981}
982
0896b752
AA		 983#define iscsi_session_int_attr(field, param, format) \
984 iscsi_session_int_attr_show(param, format) \
985static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL);
1da177e4 986
0896b752
AA		 987iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
988iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
989iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
990iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
991iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
992iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
993iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
994iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
1da177e4 995
0896b752
AA		 996#define SETUP_SESSION_RD_ATTR(field, param) \
997 if (priv->param_mask & (1 << param)) { \
998 priv->session_attrs[count] = &class_device_attr_##field;\
1da177e4
LT		 999 count++; \
1000 }
1001
0896b752
AA		 1002#define SETUP_CONN_RD_ATTR(field, param) \
1003 if (priv->param_mask & (1 << param)) { \
1004 priv->conn_attrs[count] = &class_device_attr_##field; \
1da177e4
LT		 1005 count++; \
1006 }
1007
0896b752
AA		 1008static int iscsi_is_session_dev(const struct device *dev)
1009{
1010 return dev->release == iscsi_if_session_dev_release;
1011}
1012
1013static int iscsi_session_match(struct attribute_container *cont,
1014 struct device *dev)
1da177e4 1015{
0896b752 1016 struct iscsi_if_session *session;
1da177e4 1017 struct Scsi_Host *shost;
0896b752
AA		 1018 struct iscsi_internal *priv;
1019
1020 if (!iscsi_is_session_dev(dev))
1021 return 0;
1da177e4 1022
0896b752
AA		 1023 session = iscsi_dev_to_if_session(dev);
1024 shost = iscsi_if_session_to_shost(session);
1025 if (!shost->transportt)
1da177e4
LT		 1026 return 0;
1027
0896b752
AA		 1028 priv = to_iscsi_internal(shost->transportt);
1029 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 1030 return 0;
1031
0896b752 1032 return &priv->session_cont.ac == cont;
1da177e4
LT		 1033}
1034
0896b752 1035static int iscsi_is_conn_dev(const struct device *dev)
1da177e4 1036{
0896b752
AA		 1037 return dev->release == iscsi_if_conn_dev_release;
1038}
1039
1040static int iscsi_conn_match(struct attribute_container *cont,
1041 struct device *dev)
1042{
1043 struct iscsi_if_conn *conn;
1da177e4 1044 struct Scsi_Host *shost;
0896b752 1045 struct iscsi_internal *priv;
1da177e4 1046
0896b752 1047 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 1048 return 0;
1049
0896b752
AA		 1050 conn = iscsi_dev_to_if_conn(dev);
1051 shost = conn->host;
1052 if (!shost->transportt)
1da177e4
LT		 1053 return 0;
1054
0896b752
AA		 1055 priv = to_iscsi_internal(shost->transportt);
1056 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1057 return 0;
1da177e4 1058
0896b752
AA		 1059 return &priv->conn_cont.ac == cont;
1060}
1061
1062int iscsi_register_transport(struct iscsi_transport *tt)
1063{
1064 struct iscsi_internal *priv;
1065 unsigned long flags;
1066 int count = 0, err;
1067
1068 BUG_ON(!tt);
1069
1070 priv = iscsi_if_transport_lookup(tt);
1071 if (priv)
1072 return -EEXIST;
1073
1074 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
1075 if (!priv)
1076 return -ENOMEM;
1077 memset(priv, 0, sizeof(*priv));
1078 INIT_LIST_HEAD(&priv->list);
1079 INIT_LIST_HEAD(&priv->sessions);
1080 spin_lock_init(&priv->session_lock);
1081 priv->iscsi_transport = tt;
1082
1083 priv->cdev.class = &iscsi_transport_class;
1084 snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
1085 err = class_device_register(&priv->cdev);
1086 if (err)
1087 goto free_priv;
1088
1089 err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
1090 if (err)
1091 goto unregister_cdev;
1092
1093 /* setup parameters mask */
1094 priv->param_mask = 0xFFFFFFFF;
1095 if (!(tt->caps & CAP_MULTI_R2T))
1096 priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T);
1097 if (!(tt->caps & CAP_HDRDGST))
1098 priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN);
1099 if (!(tt->caps & CAP_DATADGST))
1100 priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN);
1101 if (!(tt->caps & CAP_MARKERS)) {
1102 priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN);
1103 priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN);
1104 }
1da177e4 1105
0896b752
AA		 1106 /* connection parameters */
1107 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1108 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1109 priv->conn_cont.ac.match = iscsi_conn_match;
1110 transport_container_register(&priv->conn_cont);
1da177e4 1111
0896b752
AA		 1112 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1113 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1114 SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN);
1115 SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN);
1116 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1117 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1118
1119 BUG_ON(count > ISCSI_CONN_ATTRS);
1120 priv->conn_attrs[count] = NULL;
1da177e4 1121 count = 0;
1da177e4 1122
0896b752
AA		 1123 /* session parameters */
1124 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1125 priv->session_cont.ac.class = &iscsi_session_class.class;
1126 priv->session_cont.ac.match = iscsi_session_match;
1127 transport_container_register(&priv->session_cont);
1128
1129 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN);
1130 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
1131 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
1132 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST);
1133 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST);
1134 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
1135 SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN)
1136 SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL);
1137
1138 BUG_ON(count > ISCSI_SESSION_ATTRS);
1139 priv->session_attrs[count] = NULL;
1140
1141 spin_lock_irqsave(&iscsi_transport_lock, flags);
1142 list_add(&priv->list, &iscsi_transports);
1143 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1144
1145 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1146 return 0;
1da177e4 1147
0896b752
AA		 1148unregister_cdev:
1149 class_device_unregister(&priv->cdev);
1150free_priv:
1151 kfree(priv);
1152 return err;
1da177e4 1153}
0896b752
AA		 1154EXPORT_SYMBOL_GPL(iscsi_register_transport);
1155
1156int iscsi_unregister_transport(struct iscsi_transport *tt)
1157{
1158 struct iscsi_internal *priv;
1159 unsigned long flags;
1160
1161 BUG_ON(!tt);
1162
0b950672 1163 mutex_lock(&rx_queue_mutex);
0896b752
AA		 1164
1165 priv = iscsi_if_transport_lookup(tt);
1166 BUG_ON (!priv);
1167
1168 spin_lock_irqsave(&priv->session_lock, flags);
1169 if (!list_empty(&priv->sessions)) {
1170 spin_unlock_irqrestore(&priv->session_lock, flags);
0b950672 1171 mutex_unlock(&rx_queue_mutex);
0896b752
AA		 1172 return -EPERM;
1173 }
1174 spin_unlock_irqrestore(&priv->session_lock, flags);
1175
1176 spin_lock_irqsave(&iscsi_transport_lock, flags);
1177 list_del(&priv->list);
1178 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1179
1180 transport_container_unregister(&priv->conn_cont);
1181 transport_container_unregister(&priv->session_cont);
1182
1183 sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
1184 class_device_unregister(&priv->cdev);
0b950672 1185 mutex_unlock(&rx_queue_mutex);
1da177e4 1186
0896b752
AA		 1187 return 0;
1188}
1189EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 1190
0896b752
AA		 1191static int
1192iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
1da177e4 1193{
0896b752
AA		 1194 struct netlink_notify *n = ptr;
1195
1196 if (event == NETLINK_URELEASE &&
1197 n->protocol == NETLINK_ISCSI && n->pid) {
1198 struct iscsi_if_conn *conn;
1199 unsigned long flags;
1200
1201 mempool_zone_complete(&z_reply);
1202 spin_lock_irqsave(&connlock, flags);
1203 list_for_each_entry(conn, &connlist, conn_list) {
1204 mempool_zone_complete(&conn->z_error);
1205 mempool_zone_complete(&conn->z_pdu);
1206 }
1207 spin_unlock_irqrestore(&connlock, flags);
1208 }
1da177e4 1209
0896b752 1210 return NOTIFY_DONE;
1da177e4
LT		 1211}
1212
0896b752
AA		 1213static struct notifier_block iscsi_nl_notifier = {
1214 .notifier_call = iscsi_rcv_nl_event,
1215};
1da177e4
LT		 1216
1217static __init int iscsi_transport_init(void)
1218{
0896b752 1219 int err;
1da177e4 1220
0896b752 1221 err = class_register(&iscsi_transport_class);
1da177e4
LT		 1222 if (err)
1223 return err;
0896b752
AA		 1224
1225 err = transport_class_register(&iscsi_connection_class);
1226 if (err)
1227 goto unregister_transport_class;
1228
1229 err = transport_class_register(&iscsi_session_class);
1230 if (err)
1231 goto unregister_conn_class;
1232
1233 err = netlink_register_notifier(&iscsi_nl_notifier);
1234 if (err)
1235 goto unregister_session_class;
1236
2290d2b6
JB		 1237 nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
1238 THIS_MODULE);
0896b752
AA		 1239 if (!nls) {
1240 err = -ENOBUFS;
1241 goto unregister_notifier;
1242 }
1243
1244 err = mempool_zone_init(&z_reply, Z_MAX_REPLY,
1245 NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
1246 if (!err)
1247 return 0;
1248
1249 sock_release(nls->sk_socket);
1250unregister_notifier:
1251 netlink_unregister_notifier(&iscsi_nl_notifier);
1252unregister_session_class:
1253 transport_class_unregister(&iscsi_session_class);
1254unregister_conn_class:
1255 transport_class_unregister(&iscsi_connection_class);
1256unregister_transport_class:
1257 class_unregister(&iscsi_transport_class);
1258 return err;
1da177e4
LT		 1259}
1260
1261static void __exit iscsi_transport_exit(void)
1262{
0896b752
AA		 1263 mempool_destroy(z_reply.pool);
1264 sock_release(nls->sk_socket);
1265 netlink_unregister_notifier(&iscsi_nl_notifier);
1266 transport_class_unregister(&iscsi_connection_class);
1267 transport_class_unregister(&iscsi_session_class);
1268 class_unregister(&iscsi_transport_class);
1da177e4
LT		 1269}
1270
1271module_init(iscsi_transport_init);
1272module_exit(iscsi_transport_exit);
1273
0896b752
AA		 1274MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1275 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1276 "Alex Aizman <itn780@yahoo.com>");
1277MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 1278MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)