scsi_transport_iscsi.c 34 KB

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