| /* |
| * iSCSI transport class definitions |
| * |
| * Copyright (C) IBM Corporation, 2004 |
| * Copyright (C) Mike Christie, 2004 - 2005 |
| * Copyright (C) Dmitry Yusupov, 2004 - 2005 |
| * Copyright (C) Alex Aizman, 2004 - 2005 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <net/tcp.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_transport_iscsi.h> |
| #include <scsi/iscsi_if.h> |
| |
| #define ISCSI_SESSION_ATTRS 19 |
| #define ISCSI_CONN_ATTRS 11 |
| #define ISCSI_HOST_ATTRS 4 |
| #define ISCSI_TRANSPORT_VERSION "2.0-867" |
| |
| struct iscsi_internal { |
| int daemon_pid; |
| struct scsi_transport_template t; |
| struct iscsi_transport *iscsi_transport; |
| struct list_head list; |
| struct class_device cdev; |
| |
| struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; |
| struct transport_container conn_cont; |
| struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; |
| struct transport_container session_cont; |
| struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
| }; |
| |
| static atomic_t iscsi_session_nr; /* sysfs session id for next new session */ |
| static struct workqueue_struct *iscsi_eh_timer_workq; |
| |
| /* |
| * list of registered transports and lock that must |
| * be held while accessing list. The iscsi_transport_lock must |
| * be acquired after the rx_queue_mutex. |
| */ |
| static LIST_HEAD(iscsi_transports); |
| static DEFINE_SPINLOCK(iscsi_transport_lock); |
| |
| #define to_iscsi_internal(tmpl) \ |
| container_of(tmpl, struct iscsi_internal, t) |
| |
| #define cdev_to_iscsi_internal(_cdev) \ |
| container_of(_cdev, struct iscsi_internal, cdev) |
| |
| static void iscsi_transport_release(struct class_device *cdev) |
| { |
| struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); |
| kfree(priv); |
| } |
| |
| /* |
| * iscsi_transport_class represents the iscsi_transports that are |
| * registered. |
| */ |
| static struct class iscsi_transport_class = { |
| .name = "iscsi_transport", |
| .release = iscsi_transport_release, |
| }; |
| |
| static ssize_t |
| show_transport_handle(struct class_device *cdev, char *buf) |
| { |
| struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); |
| return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
| } |
| static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); |
| |
| #define show_transport_attr(name, format) \ |
| static ssize_t \ |
| show_transport_##name(struct class_device *cdev, char *buf) \ |
| { \ |
| struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ |
| return sprintf(buf, format"\n", priv->iscsi_transport->name); \ |
| } \ |
| static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); |
| |
| show_transport_attr(caps, "0x%x"); |
| show_transport_attr(max_lun, "%d"); |
| show_transport_attr(max_conn, "%d"); |
| show_transport_attr(max_cmd_len, "%d"); |
| |
| static struct attribute *iscsi_transport_attrs[] = { |
| &class_device_attr_handle.attr, |
| &class_device_attr_caps.attr, |
| &class_device_attr_max_lun.attr, |
| &class_device_attr_max_conn.attr, |
| &class_device_attr_max_cmd_len.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group iscsi_transport_group = { |
| .attrs = iscsi_transport_attrs, |
| }; |
| |
| |
| |
| static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
| struct class_device *cdev) |
| { |
| struct Scsi_Host *shost = dev_to_shost(dev); |
| struct iscsi_host *ihost = shost->shost_data; |
| |
| memset(ihost, 0, sizeof(*ihost)); |
| INIT_LIST_HEAD(&ihost->sessions); |
| mutex_init(&ihost->mutex); |
| atomic_set(&ihost->nr_scans, 0); |
| |
| snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d", |
| shost->host_no); |
| ihost->scan_workq = create_singlethread_workqueue( |
| ihost->scan_workq_name); |
| if (!ihost->scan_workq) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static int iscsi_remove_host(struct transport_container *tc, struct device *dev, |
| struct class_device *cdev) |
| { |
| struct Scsi_Host *shost = dev_to_shost(dev); |
| struct iscsi_host *ihost = shost->shost_data; |
| |
| destroy_workqueue(ihost->scan_workq); |
| return 0; |
| } |
| |
| static DECLARE_TRANSPORT_CLASS(iscsi_host_class, |
| "iscsi_host", |
| iscsi_setup_host, |
| iscsi_remove_host, |
| NULL); |
| |
| static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
| "iscsi_session", |
| NULL, |
| NULL, |
| NULL); |
| |
| static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
| "iscsi_connection", |
| NULL, |
| NULL, |
| NULL); |
| |
| static struct sock *nls; |
| static DEFINE_MUTEX(rx_queue_mutex); |
| |
| static LIST_HEAD(sesslist); |
| static DEFINE_SPINLOCK(sesslock); |
| static LIST_HEAD(connlist); |
| static DEFINE_SPINLOCK(connlock); |
| |
| static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
| { |
| struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); |
| return sess->sid; |
| } |
| |
| /* |
| * Returns the matching session to a given sid |
| */ |
| static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) |
| { |
| unsigned long flags; |
| struct iscsi_cls_session *sess; |
| |
| spin_lock_irqsave(&sesslock, flags); |
| list_for_each_entry(sess, &sesslist, sess_list) { |
| if (sess->sid == sid) { |
| spin_unlock_irqrestore(&sesslock, flags); |
| return sess; |
| } |
| } |
| spin_unlock_irqrestore(&sesslock, flags); |
| return NULL; |
| } |
| |
| /* |
| * Returns the matching connection to a given sid / cid tuple |
| */ |
| static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) |
| { |
| unsigned long flags; |
| struct iscsi_cls_conn *conn; |
| |
| spin_lock_irqsave(&connlock, flags); |
| list_for_each_entry(conn, &connlist, conn_list) { |
| if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
| spin_unlock_irqrestore(&connlock, flags); |
| return conn; |
| } |
| } |
| spin_unlock_irqrestore(&connlock, flags); |
| return NULL; |
| } |
| |
| /* |
| * The following functions can be used by LLDs that allocate |
| * their own scsi_hosts or by software iscsi LLDs |
| */ |
| static struct { |
| int value; |
| char *name; |
| } iscsi_session_state_names[] = { |
| { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, |
| { ISCSI_SESSION_FAILED, "FAILED" }, |
| { ISCSI_SESSION_FREE, "FREE" }, |
| }; |
| |
| const char *iscsi_session_state_name(int state) |
| { |
| int i; |
| char *name = NULL; |
| |
| for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { |
| if (iscsi_session_state_names[i].value == state) { |
| name = iscsi_session_state_names[i].name; |
| break; |
| } |
| } |
| return name; |
| } |
| |
| int iscsi_session_chkready(struct iscsi_cls_session *session) |
| { |
| unsigned long flags; |
| int err; |
| |
| spin_lock_irqsave(&session->lock, flags); |
| switch (session->state) { |
| case ISCSI_SESSION_LOGGED_IN: |
| err = 0; |
| break; |
| case ISCSI_SESSION_FAILED: |
| err = DID_IMM_RETRY << 16; |
| break; |
| case ISCSI_SESSION_FREE: |
| err = DID_NO_CONNECT << 16; |
| break; |
| default: |
| err = DID_NO_CONNECT << 16; |
| break; |
| } |
| spin_unlock_irqrestore(&session->lock, flags); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_session_chkready); |
| |
| static void iscsi_session_release(struct device *dev) |
| { |
| struct iscsi_cls_session *session = iscsi_dev_to_session(dev); |
| struct Scsi_Host *shost; |
| |
| shost = iscsi_session_to_shost(session); |
| scsi_host_put(shost); |
| kfree(session); |
| } |
| |
| static int iscsi_is_session_dev(const struct device *dev) |
| { |
| return dev->release == iscsi_session_release; |
| } |
| |
| /** |
| * iscsi_scan_finished - helper to report when running scans are done |
| * @shost: scsi host |
| * @time: scan run time |
| * |
| * This function can be used by drives like qla4xxx to report to the scsi |
| * layer when the scans it kicked off at module load time are done. |
| */ |
| int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time) |
| { |
| struct iscsi_host *ihost = shost->shost_data; |
| /* |
| * qla4xxx will have kicked off some session unblocks before calling |
| * scsi_scan_host, so just wait for them to complete. |
| */ |
| return !atomic_read(&ihost->nr_scans); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_scan_finished); |
| |
| static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
| uint id, uint lun) |
| { |
| struct iscsi_host *ihost = shost->shost_data; |
| struct iscsi_cls_session *session; |
| |
| mutex_lock(&ihost->mutex); |
| list_for_each_entry(session, &ihost->sessions, host_list) { |
| if ((channel == SCAN_WILD_CARD || channel == 0) && |
| (id == SCAN_WILD_CARD || id == session->target_id)) |
| scsi_scan_target(&session->dev, 0, |
| session->target_id, lun, 1); |
| } |
| mutex_unlock(&ihost->mutex); |
| |
| return 0; |
| } |
| |
| static void iscsi_scan_session(struct work_struct *work) |
| { |
| struct iscsi_cls_session *session = |
| container_of(work, struct iscsi_cls_session, scan_work); |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost = shost->shost_data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&session->lock, flags); |
| if (session->state != ISCSI_SESSION_LOGGED_IN) { |
| spin_unlock_irqrestore(&session->lock, flags); |
| goto done; |
| } |
| spin_unlock_irqrestore(&session->lock, flags); |
| |
| scsi_scan_target(&session->dev, 0, session->target_id, |
| SCAN_WILD_CARD, 1); |
| done: |
| atomic_dec(&ihost->nr_scans); |
| } |
| |
| static void session_recovery_timedout(struct work_struct *work) |
| { |
| struct iscsi_cls_session *session = |
| container_of(work, struct iscsi_cls_session, |
| recovery_work.work); |
| unsigned long flags; |
| |
| dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
| "out after %d secs\n", session->recovery_tmo); |
| |
| spin_lock_irqsave(&session->lock, flags); |
| switch (session->state) { |
| case ISCSI_SESSION_FAILED: |
| session->state = ISCSI_SESSION_FREE; |
| break; |
| case ISCSI_SESSION_LOGGED_IN: |
| case ISCSI_SESSION_FREE: |
| /* we raced with the unblock's flush */ |
| spin_unlock_irqrestore(&session->lock, flags); |
| return; |
| } |
| spin_unlock_irqrestore(&session->lock, flags); |
| |
| if (session->transport->session_recovery_timedout) |
| session->transport->session_recovery_timedout(session); |
| |
| scsi_target_unblock(&session->dev); |
| } |
| |
| void __iscsi_unblock_session(struct iscsi_cls_session *session) |
| { |
| if (!cancel_delayed_work(&session->recovery_work)) |
| flush_workqueue(iscsi_eh_timer_workq); |
| scsi_target_unblock(&session->dev); |
| } |
| |
| void iscsi_unblock_session(struct iscsi_cls_session *session) |
| { |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost = shost->shost_data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&session->lock, flags); |
| session->state = ISCSI_SESSION_LOGGED_IN; |
| spin_unlock_irqrestore(&session->lock, flags); |
| |
| __iscsi_unblock_session(session); |
| /* |
| * Only do kernel scanning if the driver is properly hooked into |
| * the async scanning code (drivers like iscsi_tcp do login and |
| * scanning from userspace). |
| */ |
| if (shost->hostt->scan_finished) { |
| if (queue_work(ihost->scan_workq, &session->scan_work)) |
| atomic_inc(&ihost->nr_scans); |
| } |
| } |
| EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
| |
| void iscsi_block_session(struct iscsi_cls_session *session) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&session->lock, flags); |
| session->state = ISCSI_SESSION_FAILED; |
| spin_unlock_irqrestore(&session->lock, flags); |
| |
| scsi_target_block(&session->dev); |
| queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
| session->recovery_tmo * HZ); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_block_session); |
| |
| static void __iscsi_unbind_session(struct work_struct *work) |
| { |
| struct iscsi_cls_session *session = |
| container_of(work, struct iscsi_cls_session, |
| unbind_work); |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost = shost->shost_data; |
| |
| /* Prevent new scans and make sure scanning is not in progress */ |
| mutex_lock(&ihost->mutex); |
| if (list_empty(&session->host_list)) { |
| mutex_unlock(&ihost->mutex); |
| return; |
| } |
| list_del_init(&session->host_list); |
| mutex_unlock(&ihost->mutex); |
| |
| scsi_remove_target(&session->dev); |
| iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); |
| } |
| |
| static int iscsi_unbind_session(struct iscsi_cls_session *session) |
| { |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost = shost->shost_data; |
| |
| return queue_work(ihost->scan_workq, &session->unbind_work); |
| } |
| |
| struct iscsi_cls_session * |
| iscsi_alloc_session(struct Scsi_Host *shost, |
| struct iscsi_transport *transport) |
| { |
| struct iscsi_cls_session *session; |
| |
| session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
| GFP_KERNEL); |
| if (!session) |
| return NULL; |
| |
| session->transport = transport; |
| session->recovery_tmo = 120; |
| session->state = ISCSI_SESSION_FREE; |
| INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
| INIT_LIST_HEAD(&session->host_list); |
| INIT_LIST_HEAD(&session->sess_list); |
| INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
| INIT_WORK(&session->scan_work, iscsi_scan_session); |
| spin_lock_init(&session->lock); |
| |
| /* this is released in the dev's release function */ |
| scsi_host_get(shost); |
| session->dev.parent = &shost->shost_gendev; |
| session->dev.release = iscsi_session_release; |
| device_initialize(&session->dev); |
| if (transport->sessiondata_size) |
| session->dd_data = &session[1]; |
| return session; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_alloc_session); |
| |
| int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
| { |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost; |
| unsigned long flags; |
| int err; |
| |
| ihost = shost->shost_data; |
| session->sid = atomic_add_return(1, &iscsi_session_nr); |
| session->target_id = target_id; |
| |
| snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
| session->sid); |
| err = device_add(&session->dev); |
| if (err) { |
| dev_printk(KERN_ERR, &session->dev, "iscsi: could not " |
| "register session's dev\n"); |
| goto release_host; |
| } |
| transport_register_device(&session->dev); |
| |
| spin_lock_irqsave(&sesslock, flags); |
| list_add(&session->sess_list, &sesslist); |
| spin_unlock_irqrestore(&sesslock, flags); |
| |
| mutex_lock(&ihost->mutex); |
| list_add(&session->host_list, &ihost->sessions); |
| mutex_unlock(&ihost->mutex); |
| |
| iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); |
| return 0; |
| |
| release_host: |
| scsi_host_put(shost); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_add_session); |
| |
| /** |
| * iscsi_create_session - create iscsi class session |
| * @shost: scsi host |
| * @transport: iscsi transport |
| * @target_id: which target |
| * |
| * This can be called from a LLD or iscsi_transport. |
| */ |
| struct iscsi_cls_session * |
| iscsi_create_session(struct Scsi_Host *shost, |
| struct iscsi_transport *transport, |
| unsigned int target_id) |
| { |
| struct iscsi_cls_session *session; |
| |
| session = iscsi_alloc_session(shost, transport); |
| if (!session) |
| return NULL; |
| |
| if (iscsi_add_session(session, target_id)) { |
| iscsi_free_session(session); |
| return NULL; |
| } |
| return session; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_create_session); |
| |
| static void iscsi_conn_release(struct device *dev) |
| { |
| struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); |
| struct device *parent = conn->dev.parent; |
| |
| kfree(conn); |
| put_device(parent); |
| } |
| |
| static int iscsi_is_conn_dev(const struct device *dev) |
| { |
| return dev->release == iscsi_conn_release; |
| } |
| |
| static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) |
| { |
| if (!iscsi_is_conn_dev(dev)) |
| return 0; |
| return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); |
| } |
| |
| void iscsi_remove_session(struct iscsi_cls_session *session) |
| { |
| struct Scsi_Host *shost = iscsi_session_to_shost(session); |
| struct iscsi_host *ihost = shost->shost_data; |
| unsigned long flags; |
| int err; |
| |
| spin_lock_irqsave(&sesslock, flags); |
| list_del(&session->sess_list); |
| spin_unlock_irqrestore(&sesslock, flags); |
| |
| /* |
| * If we are blocked let commands flow again. The lld or iscsi |
| * layer should set up the queuecommand to fail commands. |
| */ |
| spin_lock_irqsave(&session->lock, flags); |
| session->state = ISCSI_SESSION_FREE; |
| spin_unlock_irqrestore(&session->lock, flags); |
| __iscsi_unblock_session(session); |
| __iscsi_unbind_session(&session->unbind_work); |
| |
| /* flush running scans */ |
| flush_workqueue(ihost->scan_workq); |
| /* |
| * If the session dropped while removing devices then we need to make |
| * sure it is not blocked |
| */ |
| if (!cancel_delayed_work(&session->recovery_work)) |
| flush_workqueue(iscsi_eh_timer_workq); |
| |
| /* hw iscsi may not have removed all connections from session */ |
| err = device_for_each_child(&session->dev, NULL, |
| iscsi_iter_destroy_conn_fn); |
| if (err) |
| dev_printk(KERN_ERR, &session->dev, "iscsi: Could not delete " |
| "all connections for session. Error %d.\n", err); |
| |
| transport_unregister_device(&session->dev); |
| device_del(&session->dev); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_remove_session); |
| |
| void iscsi_free_session(struct iscsi_cls_session *session) |
| { |
| iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
| put_device(&session->dev); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_free_session); |
| |
| /** |
| * iscsi_destroy_session - destroy iscsi session |
| * @session: iscsi_session |
| * |
| * Can be called by a LLD or iscsi_transport. There must not be |
| * any running connections. |
| */ |
| int iscsi_destroy_session(struct iscsi_cls_session *session) |
| { |
| iscsi_remove_session(session); |
| iscsi_free_session(session); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
| |
| /** |
| * iscsi_create_conn - create iscsi class connection |
| * @session: iscsi cls session |
| * @cid: connection id |
| * |
| * This can be called from a LLD or iscsi_transport. The connection |
| * is child of the session so cid must be unique for all connections |
| * on the session. |
| * |
| * Since we do not support MCS, cid will normally be zero. In some cases |
| * for software iscsi we could be trying to preallocate a connection struct |
| * in which case there could be two connection structs and cid would be |
| * non-zero. |
| */ |
| struct iscsi_cls_conn * |
| iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) |
| { |
| struct iscsi_transport *transport = session->transport; |
| struct iscsi_cls_conn *conn; |
| unsigned long flags; |
| int err; |
| |
| conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); |
| if (!conn) |
| return NULL; |
| |
| if (transport->conndata_size) |
| conn->dd_data = &conn[1]; |
| |
| INIT_LIST_HEAD(&conn->conn_list); |
| conn->transport = transport; |
| conn->cid = cid; |
| |
| /* this is released in the dev's release function */ |
| if (!get_device(&session->dev)) |
| goto free_conn; |
| |
| snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
| session->sid, cid); |
| conn->dev.parent = &session->dev; |
| conn->dev.release = iscsi_conn_release; |
| err = device_register(&conn->dev); |
| if (err) { |
| dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " |
| "connection's dev\n"); |
| goto release_parent_ref; |
| } |
| transport_register_device(&conn->dev); |
| |
| spin_lock_irqsave(&connlock, flags); |
| list_add(&conn->conn_list, &connlist); |
| conn->active = 1; |
| spin_unlock_irqrestore(&connlock, flags); |
| return conn; |
| |
| release_parent_ref: |
| put_device(&session->dev); |
| free_conn: |
| kfree(conn); |
| return NULL; |
| } |
| |
| EXPORT_SYMBOL_GPL(iscsi_create_conn); |
| |
| /** |
| * iscsi_destroy_conn - destroy iscsi class connection |
| * @conn: iscsi cls session |
| * |
| * This can be called from a LLD or iscsi_transport. |
| */ |
| int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&connlock, flags); |
| conn->active = 0; |
| list_del(&conn->conn_list); |
| spin_unlock_irqrestore(&connlock, flags); |
| |
| transport_unregister_device(&conn->dev); |
| device_unregister(&conn->dev); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
| |
| /* |
| * iscsi interface functions |
| */ |
| static struct iscsi_internal * |
| iscsi_if_transport_lookup(struct iscsi_transport *tt) |
| { |
| struct iscsi_internal *priv; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iscsi_transport_lock, flags); |
| list_for_each_entry(priv, &iscsi_transports, list) { |
| if (tt == priv->iscsi_transport) { |
| spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| return priv; |
| } |
| } |
| spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| return NULL; |
| } |
| |
| static int |
| iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
| { |
| int rc; |
| |
| rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
| if (rc < 0) { |
| printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| iscsi_unicast_skb(struct sk_buff *skb, int pid) |
| { |
| int rc; |
| |
| rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
| if (rc < 0) { |
| printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
| char *data, uint32_t data_size) |
| { |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| struct iscsi_uevent *ev; |
| char *pdu; |
| struct iscsi_internal *priv; |
| int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
| data_size); |
| |
| priv = iscsi_if_transport_lookup(conn->transport); |
| if (!priv) |
| return -EINVAL; |
| |
| skb = alloc_skb(len, GFP_ATOMIC); |
| if (!skb) { |
| iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
| dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
| "control PDU: OOM\n"); |
| return -ENOMEM; |
| } |
| |
| nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
| ev = NLMSG_DATA(nlh); |
| memset(ev, 0, sizeof(*ev)); |
| ev->transport_handle = iscsi_handle(conn->transport); |
| ev->type = ISCSI_KEVENT_RECV_PDU; |
| ev->r.recv_req.cid = conn->cid; |
| ev->r.recv_req.sid = iscsi_conn_get_sid(conn); |
| pdu = (char*)ev + sizeof(*ev); |
| memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); |
| memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); |
| |
| return iscsi_unicast_skb(skb, priv->daemon_pid); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
| |
| void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
| { |
| struct iscsi_cls_session *session = iscsi_conn_to_session(conn); |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| struct iscsi_uevent *ev; |
| struct iscsi_internal *priv; |
| int len = NLMSG_SPACE(sizeof(*ev)); |
| unsigned long flags; |
| |
| priv = iscsi_if_transport_lookup(conn->transport); |
| if (!priv) |
| return; |
| |
| spin_lock_irqsave(&session->lock, flags); |
| if (session->state == ISCSI_SESSION_LOGGED_IN) |
| session->state = ISCSI_SESSION_FAILED; |
| spin_unlock_irqrestore(&session->lock, flags); |
| |
| skb = alloc_skb(len, GFP_ATOMIC); |
| if (!skb) { |
| dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
| "conn error (%d)\n", error); |
| return; |
| } |
| |
| nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
| ev = NLMSG_DATA(nlh); |
| ev->transport_handle = iscsi_handle(conn->transport); |
| ev->type = ISCSI_KEVENT_CONN_ERROR; |
| ev->r.connerror.error = error; |
| ev->r.connerror.cid = conn->cid; |
| ev->r.connerror.sid = iscsi_conn_get_sid(conn); |
| |
| iscsi_broadcast_skb(skb, GFP_ATOMIC); |
| |
| dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
| error); |
| } |
| EXPORT_SYMBOL_GPL(iscsi_conn_error); |
| |
| static int |
| iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, |
| void *payload, int size) |
| { |
| struct sk_buff *skb; |
| struct nlmsghdr *nlh; |
| int len = NLMSG_SPACE(size); |
| int flags = multi ? NLM_F_MULTI : 0; |
| int t = done ? NLMSG_DONE : type; |
| |
| skb = alloc_skb(len, GFP_ATOMIC); |
| if (!skb) { |
| printk(KERN_ERR "Could not allocate skb to send reply.\n"); |
| return -ENOMEM; |
| } |
| |
| nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); |
| nlh->nlmsg_flags = flags; |
| memcpy(NLMSG_DATA(nlh), payload, size); |
| return iscsi_unicast_skb(skb, pid); |
| } |
| |
| static int |
| iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
| { |
| struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
| struct iscsi_stats *stats; |
| struct sk_buff *skbstat; |
| struct iscsi_cls_conn *conn; |
| struct nlmsghdr *nlhstat; |
| struct iscsi_uevent *evstat; |
| struct iscsi_internal *priv; |
| int len = NLMSG_SPACE(sizeof(*ev) + |
| sizeof(struct iscsi_stats) + |
| sizeof(struct iscsi_stats_custom) * |
| ISCSI_STATS_CUSTOM_MAX); |
| int err = 0; |
| |
| priv = iscsi_if_transport_lookup(transport); |
| if (!priv) |
| return -EINVAL; |
| |
| conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
| if (!conn) |
| return -EEXIST; |
| |
| do { |
| int actual_size; |
| |
| skbstat = alloc_skb(len, GFP_ATOMIC); |
| if (!skbstat) { |
| dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " |
| "deliver stats: OOM\n"); |
| return -ENOMEM; |
| } |
| |
| nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
| (len - sizeof(*nlhstat)), 0); |
| evstat = NLMSG_DATA(nlhstat); |
| memset(evstat, 0, sizeof(*evstat)); |
| evstat->transport_handle = iscsi_handle(conn->transport); |
| evstat->type = nlh->nlmsg_type; |
| evstat->u.get_stats.cid = |
| ev->u.get_stats.cid; |
| evstat->u.get_stats.sid = |
| ev->u.get_stats.sid; |
| stats = (struct iscsi_stats *) |
| ((char*)evstat + sizeof(*evstat)); |
| memset(stats, 0, sizeof(*stats)); |
| |
| transport->get_stats(conn, stats); |
| actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
| sizeof(struct iscsi_stats) + |
| sizeof(struct iscsi_stats_custom) * |
| stats->custom_length); |
| actual_size -= sizeof(*nlhstat); |
| actual_size = NLMSG_LENGTH(actual_size); |
| skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
| nlhstat->nlmsg_len = actual_size; |
| |
| err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
| } while (err < 0 && err != -ECONNREFUSED); |
| |
| return err; |
| } |
| |
| /** |
| * iscsi_session_event - send session destr. completion event |
| * @session: iscsi class session |
| * @event: type of event |
| */ |
| int iscsi_session_event(struct iscsi_cls_session *session, |
| enum iscsi_uevent_e event) |
| { |
| struct iscsi_internal *priv; |
| struct Scsi_Host *shost; |
| struct iscsi_uevent *ev; |
| struct sk_buff *skb; |
| struct nlmsghdr *nlh; |
| int rc, len = NLMSG_SPACE(sizeof(*ev)); |
| |
| priv = iscsi_if_transport_lookup(session->transport); |
| if (!priv) |
| return -EINVAL; |
| shost = iscsi_session_to_shost(session); |
| |
| skb = alloc_skb(len, GFP_KERNEL); |
| if (!skb) { |
| dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
| "of session event %u\n", event); |
| return -ENOMEM; |
| } |
| |
| nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
| ev = NLMSG_DATA(nlh); |
| ev->transport_handle = iscsi_handle(session->transport); |
| |
| ev->type = event; |
| switch (event) { |
| case ISCSI_KEVENT_DESTROY_SESSION: |
| ev->r.d_session.host_no = shost->host_no; |
| ev->r.d_session.sid = session->sid; |
| break; |
| case ISCSI_KEVENT_CREATE_SESSION: |
| ev->r.c_session_ret.host_no = shost->host_no; |
| ev->r.c_session_ret.sid = session->sid; |
| break; |
| case ISCSI_KEVENT_UNBIND_SESSION: |
| ev->r.unbind_session.host_no = shost->host_no; |
| ev->r.unbind_session.sid = session->sid; |
| break; |
| default: |
| dev_printk(KERN_ERR, &session->dev, "Invalid event %u.\n", |
| event); |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| /* |
| * this will occur if the daemon is not up, so we just warn |
| * the user and when the daemon is restarted it will handle it |
| */ |
| rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
| if (rc < 0) |
| dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
| "of session event %u. Check iscsi daemon\n", event); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_session_event); |
| |
| static int |
| iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) |
| { |
| struct iscsi_transport *transport = priv->iscsi_transport; |
| struct iscsi_cls_session *session; |
| uint32_t hostno; |
| |
| session = transport->create_session(transport, &priv->t, |
| ev->u.c_session.cmds_max, |
| ev->u.c_session.queue_depth, |
| ev->u.c_session.initial_cmdsn, |
| &hostno); |
| if (!session) |
| return -ENOMEM; |
| |
| ev->r.c_session_ret.host_no = hostno; |
| ev->r.c_session_ret.sid = session->sid; |
| return 0; |
| } |
| |
| static int |
| iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
| { |
| struct iscsi_cls_conn *conn; |
| struct iscsi_cls_session *session; |
| |
| session = iscsi_session_lookup(ev->u.c_conn.sid); |
| if (!session) { |
| printk(KERN_ERR "iscsi: invalid session %d\n", |
| ev->u.c_conn.sid); |
| return -EINVAL; |
| } |
| |
| conn = transport->create_conn(session, ev->u.c_conn.cid); |
| if (!conn) { |
| printk(KERN_ERR "iscsi: couldn't create a new " |
| "connection for session %d\n", |
| session->sid); |
| return -ENOMEM; |
| } |
| |
| ev->r.c_conn_ret.sid = session->sid; |
| ev->r.c_conn_ret.cid = conn->cid; |
| return 0; |
| } |
| |
| static int |
| iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
| { |
| struct iscsi_cls_conn *conn; |
| |
| conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
| if (!conn) |
| return -EINVAL; |
| |
| if (transport->destroy_conn) |
| transport->destroy_conn(conn); |
| return 0; |
| } |
| |
| static int |
| iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
| { |
| char *data = (char*)ev + sizeof(*ev); |
| struct iscsi_cls_conn *conn; |
| struct iscsi_cls_session *session; |
| int err = 0, value = 0; |
| |
| session = iscsi_session_lookup(ev->u.set_param.sid); |
| conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); |
| if (!conn || !session) |
| return -EINVAL; |
| |
| switch (ev->u.set_param.param) { |
| case ISCSI_PARAM_SESS_RECOVERY_TMO: |
| sscanf(data, "%d", &value); |
| if (value != 0) |
| session->recovery_tmo = value; |
| break; |
| default: |
| err = transport->set_param(conn, ev->u.set_param.param, |
| data, ev->u.set_param.len); |
| } |
| |
| return err; |
| } |
| |
| static int |
| iscsi_if_transport_ep(struct iscsi_transport *transport, |
| struct iscsi_uevent *ev, int msg_type) |
| { |
| struct sockaddr *dst_addr; |
| int rc = 0; |
| |
| switch (msg_type) { |
| case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
| if (!transport->ep_connect) |
| return -EINVAL; |
| |
| dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
| rc = transport->ep_connect(dst_addr, |
| ev->u.ep_connect.non_blocking, |
| &ev->r.ep_connect_ret.handle); |
| break; |
| case ISCSI_UEVENT_TRANSPORT_EP_POLL: |
| if (!transport->ep_poll) |
| return -EINVAL; |
| |
| ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, |
| ev->u.ep_poll.timeout_ms); |
| break; |
| case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: |
| if (!transport->ep_disconnect) |
| return -EINVAL; |
| |
| transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); |
| break; |
| } |
| return rc; |
| } |
| |
| static int |
| iscsi_tgt_dscvr(struct iscsi_transport *transport, |
| struct iscsi_uevent *ev) |
| { |
| struct Scsi_Host *shost; |
| struct sockaddr *dst_addr; |
| int err; |
| |
| if (!transport->tgt_dscvr) |
| return -EINVAL; |
| |
| shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
| if (IS_ERR(shost)) { |
| printk(KERN_ERR "target discovery could not find host no %u\n", |
| ev->u.tgt_dscvr.host_no); |
| return -ENODEV; |
| } |
| |
| |
| dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
| err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
| ev->u.tgt_dscvr.enable, dst_addr); |
| scsi_host_put(shost); |
| return err; |
| } |
| |
| static int |
| iscsi_set_host_param(struct iscsi_transport *transport, |
| struct iscsi_uevent *ev) |
| { |
| char *data = (char*)ev + sizeof(*ev); |
| struct Scsi_Host *shost; |
| int err; |
| |
| if (!transport->set_host_param) |
| return -ENOSYS; |
| |
| shost = scsi_host_lookup(ev->u.set_host_param.host_no); |
| if (IS_ERR(shost)) { |
| printk(KERN_ERR "set_host_param could not find host no %u\n", |
| ev->u.set_host_param.host_no); |
| return -ENODEV; |
| } |
| |
| err = transport->set_host_param(shost, ev->u.set_host_param.param, |
| data, ev->u.set_host_param.len); |
| scsi_host_put(shost); |
| return err; |
| } |
| |
| static int |
| iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| int err = 0; |
| struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
| struct iscsi_transport *transport = NULL; |
| struct iscsi_internal *priv; |
| struct iscsi_cls_session *session; |
| struct iscsi_cls_conn *conn; |
| |
| priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
| if (!priv) |
| return -EINVAL; |
| transport = priv->iscsi_transport; |
| |
| if (!try_module_get(transport->owner)) |
| return -EINVAL; |
| |
| priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
| |
| switch (nlh->nlmsg_type) { |
| case ISCSI_UEVENT_CREATE_SESSION: |
| err = iscsi_if_create_session(priv, ev); |
| break; |
| case ISCSI_UEVENT_DESTROY_SESSION: |
| session = iscsi_session_lookup(ev->u.d_session.sid); |
| if (session) |
| transport->destroy_session(session); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_UNBIND_SESSION: |
| session = iscsi_session_lookup(ev->u.d_session.sid); |
| if (session) |
| iscsi_unbind_session(session); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_CREATE_CONN: |
| err = iscsi_if_create_conn(transport, ev); |
| break; |
| case ISCSI_UEVENT_DESTROY_CONN: |
| err = iscsi_if_destroy_conn(transport, ev); |
| break; |
| case ISCSI_UEVENT_BIND_CONN: |
| session = iscsi_session_lookup(ev->u.b_conn.sid); |
| conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); |
| |
| if (session && conn) |
| ev->r.retcode = transport->bind_conn(session, conn, |
| ev->u.b_conn.transport_eph, |
| ev->u.b_conn.is_leading); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_SET_PARAM: |
| err = iscsi_set_param(transport, ev); |
| break; |
| case ISCSI_UEVENT_START_CONN: |
| conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
| if (conn) |
| ev->r.retcode = transport->start_conn(conn); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_STOP_CONN: |
| conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
| if (conn) |
| transport->stop_conn(conn, ev->u.stop_conn.flag); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_SEND_PDU: |
| conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
| if (conn) |
| ev->r.retcode = transport->send_pdu(conn, |
| (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), |
| (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, |
| ev->u.send_pdu.data_size); |
| else |
| err = -EINVAL; |
| break; |
| case ISCSI_UEVENT_GET_STATS: |
| err = iscsi_if_get_stats(transport, nlh); |
| break; |
| case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
| case ISCSI_UEVENT_TRANSPORT_EP_POLL: |
| case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: |
| err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); |
| break; |
| case ISCSI_UEVENT_TGT_DSCVR: |
| err = iscsi_tgt_dscvr(transport, ev); |
| break; |
| case ISCSI_UEVENT_SET_HOST_PARAM: |
| err = iscsi_set_host_param(transport, ev); |
| break; |
| default: |
| err = -ENOSYS; |
| break; |
| } |
| |
| module_put(transport->owner); |
| return err; |
| } |
| |
| /* |
| * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
| * Malformed skbs with wrong lengths or invalid creds are not processed. |
| */ |
| static void |
| iscsi_if_rx(struct sk_buff *skb) |
| { |
| mutex_lock(&rx_queue_mutex); |
| while (skb->len >= NLMSG_SPACE(0)) { |
| int err; |
| uint32_t rlen; |
| struct nlmsghdr *nlh; |
| struct iscsi_uevent *ev; |
| |
| nlh = nlmsg_hdr(skb); |
| if (nlh->nlmsg_len < sizeof(*nlh) || |
| skb->len < nlh->nlmsg_len) { |
| break; |
| } |
| |
| ev = NLMSG_DATA(nlh); |
| rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| if (rlen > skb->len) |
| rlen = skb->len; |
| |
| err = iscsi_if_recv_msg(skb, nlh); |
| if (err) { |
| ev->type = ISCSI_KEVENT_IF_ERROR; |
| ev->iferror = err; |
| } |
| do { |
| /* |
| * special case for GET_STATS: |
| * on success - sending reply and stats from |
| * inside of if_recv_msg(), |
| * on error - fall through. |
| */ |
| if (ev->type == ISCSI_UEVENT_GET_STATS && !err) |
| break; |
| err = iscsi_if_send_reply( |
| NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, |
| nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); |
| } while (err < 0 && err != -ECONNREFUSED); |
| skb_pull(skb, rlen); |
| } |
| mutex_unlock(&rx_queue_mutex); |
| } |
| |
| #define iscsi_cdev_to_conn(_cdev) \ |
| iscsi_dev_to_conn(_cdev->dev) |
| |
| #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
| struct class_device_attribute class_device_attr_##_prefix##_##_name = \ |
| __ATTR(_name,_mode,_show,_store) |
| |
| /* |
| * iSCSI connection attrs |
| */ |
| #define iscsi_conn_attr_show(param) \ |
| static ssize_t \ |
| show_conn_param_##param(struct class_device *cdev, char *buf) \ |
| { \ |
| struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
| struct iscsi_transport *t = conn->transport; \ |
| return t->get_conn_param(conn, param, buf); \ |
| } |
| |
| #define iscsi_conn_attr(field, param) \ |
| iscsi_conn_attr_show(param) \ |
| static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ |
| NULL); |
| |
| iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
| iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); |
| iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); |
| iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); |
| iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); |
| iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); |
| iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); |
| iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); |
| iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); |
| iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); |
| iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); |
| iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
| iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); |
| |
| #define iscsi_cdev_to_session(_cdev) \ |
| iscsi_dev_to_session(_cdev->dev) |
| |
| /* |
| * iSCSI session attrs |
| */ |
| #define iscsi_session_attr_show(param, perm) \ |
| static ssize_t \ |
| show_session_param_##param(struct class_device *cdev, char *buf) \ |
| { \ |
| struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
| struct iscsi_transport *t = session->transport; \ |
| \ |
| if (perm && !capable(CAP_SYS_ADMIN)) \ |
| return -EACCES; \ |
| return t->get_session_param(session, param, buf); \ |
| } |
| |
| #define iscsi_session_attr(field, param, perm) \ |
| iscsi_session_attr_show(param, perm) \ |
| static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
| NULL); |
| |
| iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
| iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); |
| iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); |
| iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); |
| iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); |
| iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); |
| iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); |
| iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); |
| iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); |
| iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); |
| iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); |
| iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); |
| iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); |
| iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); |
| iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
| iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); |
| iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); |
| |
| static ssize_t |
| show_priv_session_state(struct class_device *cdev, char *buf) |
| { |
| struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); |
| return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); |
| } |
| static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, |
| NULL); |
| |
| #define iscsi_priv_session_attr_show(field, format) \ |
| static ssize_t \ |
| show_priv_session_##field(struct class_device *cdev, char *buf) \ |
| { \ |
| struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
| return sprintf(buf, format"\n", session->field); \ |
| } |
| |
| #define iscsi_priv_session_attr(field, format) \ |
| iscsi_priv_session_attr_show(field, format) \ |
| static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ |
| NULL) |
| iscsi_priv_session_attr(recovery_tmo, "%d"); |
| |
| /* |
| * iSCSI host attrs |
| */ |
| #define iscsi_host_attr_show(param) \ |
| static ssize_t \ |
| show_host_param_##param(struct class_device *cdev, char *buf) \ |
| { \ |
| struct Scsi_Host *shost = transport_class_to_shost(cdev); \ |
| struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ |
| return priv->iscsi_transport->get_host_param(shost, param, buf); \ |
| } |
| |
| #define iscsi_host_attr(field, param) \ |
| iscsi_host_attr_show(param) \ |
| static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ |
| NULL); |
| |
| iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
| iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
| iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
| iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
| |
| #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
| do { \ |
| priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ |
| count++; \ |
| } while (0) |
| |
| |
| #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
| do { \ |
| if (tt->param_mask & param_flag) { \ |
| priv->session_attrs[count] = &class_device_attr_sess_##field; \ |
| count++; \ |
| } \ |
| } while (0) |
| |
| #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
| do { \ |
| if (tt->param_mask & param_flag) { \ |
| priv->conn_attrs[count] = &class_device_attr_conn_##field; \ |
| count++; \ |
| } \ |
| } while (0) |
| |
| #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
| do { \ |
| if (tt->host_param_mask & param_flag) { \ |
| priv->host_attrs[count] = &class_device_attr_host_##field; \ |
| count++; \ |
| } \ |
| } while (0) |
| |
| static int iscsi_session_match(struct attribute_container *cont, |
| struct device *dev) |
| { |
| struct iscsi_cls_session *session; |
| struct Scsi_Host *shost; |
| struct iscsi_internal *priv; |
| |
| if (!iscsi_is_session_dev(dev)) |
| return 0; |
| |
| session = iscsi_dev_to_session(dev); |
| shost = iscsi_session_to_shost(session); |
| if (!shost->transportt) |
| return 0; |
| |
| priv = to_iscsi_internal(shost->transportt); |
| if (priv->session_cont.ac.class != &iscsi_session_class.class) |
| return 0; |
| |
| return &priv->session_cont.ac == cont; |
| } |
| |
| static int iscsi_conn_match(struct attribute_container *cont, |
| struct device *dev) |
| { |
| struct iscsi_cls_session *session; |
| struct iscsi_cls_conn *conn; |
| struct Scsi_Host *shost; |
| struct iscsi_internal *priv; |
| |
| if (!iscsi_is_conn_dev(dev)) |
| return 0; |
| |
| conn = iscsi_dev_to_conn(dev); |
| session = iscsi_dev_to_session(conn->dev.parent); |
| shost = iscsi_session_to_shost(session); |
| |
| if (!shost->transportt) |
| return 0; |
| |
| priv = to_iscsi_internal(shost->transportt); |
| if (priv->conn_cont.ac.class != &iscsi_connection_class.class) |
| return 0; |
| |
| return &priv->conn_cont.ac == cont; |
| } |
| |
| static int iscsi_host_match(struct attribute_container *cont, |
| struct device *dev) |
| { |
| struct Scsi_Host *shost; |
| struct iscsi_internal *priv; |
| |
| if (!scsi_is_host_device(dev)) |
| return 0; |
| |
| shost = dev_to_shost(dev); |
| if (!shost->transportt || |
| shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) |
| return 0; |
| |
| priv = to_iscsi_internal(shost->transportt); |
| return &priv->t.host_attrs.ac == cont; |
| } |
| |
| struct scsi_transport_template * |
| iscsi_register_transport(struct iscsi_transport *tt) |
| { |
| struct iscsi_internal *priv; |
| unsigned long flags; |
| int count = 0, err; |
| |
| BUG_ON(!tt); |
| |
| priv = iscsi_if_transport_lookup(tt); |
| if (priv) |
| return NULL; |
| |
| priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return NULL; |
| INIT_LIST_HEAD(&priv->list); |
| priv->daemon_pid = -1; |
| priv->iscsi_transport = tt; |
| priv->t.user_scan = iscsi_user_scan; |
| |
| priv->cdev.class = &iscsi_transport_class; |
| snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); |
| err = class_device_register(&priv->cdev); |
| if (err) |
| goto free_priv; |
| |
| err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); |
| if (err) |
| goto unregister_cdev; |
| |
| /* host parameters */ |
| priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; |
| priv->t.host_attrs.ac.class = &iscsi_host_class.class; |
| priv->t.host_attrs.ac.match = iscsi_host_match; |
| priv->t.host_size = sizeof(struct iscsi_host); |
| transport_container_register(&priv->t.host_attrs); |
| |
| SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
| SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
| SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
| SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
| BUG_ON(count > ISCSI_HOST_ATTRS); |
| priv->host_attrs[count] = NULL; |
| count = 0; |
| |
| /* connection parameters */ |
| priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; |
| priv->conn_cont.ac.class = &iscsi_connection_class.class; |
| priv->conn_cont.ac.match = iscsi_conn_match; |
| transport_container_register(&priv->conn_cont); |
| |
| SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
| SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); |
| SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); |
| SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); |
| SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); |
| SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); |
| SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); |
| SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); |
| SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
| SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
| SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); |
| SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
| SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); |
| |
| BUG_ON(count > ISCSI_CONN_ATTRS); |
| priv->conn_attrs[count] = NULL; |
| count = 0; |
| |
| /* session parameters */ |
| priv->session_cont.ac.attrs = &priv->session_attrs[0]; |
| priv->session_cont.ac.class = &iscsi_session_class.class; |
| priv->session_cont.ac.match = iscsi_session_match; |
| transport_container_register(&priv->session_cont); |
| |
| SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
| SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); |
| SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); |
| SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); |
| SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); |
| SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); |
| SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); |
| SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); |
| SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
| SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); |
| SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
| SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); |
| SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); |
| SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); |
| SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
| SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
| SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); |
| SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
| SETUP_PRIV_SESSION_RD_ATTR(state); |
| |
| BUG_ON(count > ISCSI_SESSION_ATTRS); |
| priv->session_attrs[count] = NULL; |
| |
| spin_lock_irqsave(&iscsi_transport_lock, flags); |
| list_add(&priv->list, &iscsi_transports); |
| spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| |
| printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); |
| return &priv->t; |
| |
| unregister_cdev: |
| class_device_unregister(&priv->cdev); |
| free_priv: |
| kfree(priv); |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_register_transport); |
| |
| int iscsi_unregister_transport(struct iscsi_transport *tt) |
| { |
| struct iscsi_internal *priv; |
| unsigned long flags; |
| |
| BUG_ON(!tt); |
| |
| mutex_lock(&rx_queue_mutex); |
| |
| priv = iscsi_if_transport_lookup(tt); |
| BUG_ON (!priv); |
| |
| spin_lock_irqsave(&iscsi_transport_lock, flags); |
| list_del(&priv->list); |
| spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
| |
| transport_container_unregister(&priv->conn_cont); |
| transport_container_unregister(&priv->session_cont); |
| transport_container_unregister(&priv->t.host_attrs); |
| |
| sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); |
| class_device_unregister(&priv->cdev); |
| mutex_unlock(&rx_queue_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iscsi_unregister_transport); |
| |
| static __init int iscsi_transport_init(void) |
| { |
| int err; |
| |
| printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
| ISCSI_TRANSPORT_VERSION); |
| |
| atomic_set(&iscsi_session_nr, 0); |
| |
| err = class_register(&iscsi_transport_class); |
| if (err) |
| return err; |
| |
| err = transport_class_register(&iscsi_host_class); |
| if (err) |
| goto unregister_transport_class; |
| |
| err = transport_class_register(&iscsi_connection_class); |
| if (err) |
| goto unregister_host_class; |
| |
| err = transport_class_register(&iscsi_session_class); |
| if (err) |
| goto unregister_conn_class; |
| |
| nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
| THIS_MODULE); |
| if (!nls) { |
| err = -ENOBUFS; |
| goto unregister_session_class; |
| } |
| |
| iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
| if (!iscsi_eh_timer_workq) |
| goto release_nls; |
| |
| return 0; |
| |
| release_nls: |
| netlink_kernel_release(nls); |
| unregister_session_class: |
| transport_class_unregister(&iscsi_session_class); |
| unregister_conn_class: |
| transport_class_unregister(&iscsi_connection_class); |
| unregister_host_class: |
| transport_class_unregister(&iscsi_host_class); |
| unregister_transport_class: |
| class_unregister(&iscsi_transport_class); |
| return err; |
| } |
| |
| static void __exit iscsi_transport_exit(void) |
| { |
| destroy_workqueue(iscsi_eh_timer_workq); |
| netlink_kernel_release(nls); |
| transport_class_unregister(&iscsi_connection_class); |
| transport_class_unregister(&iscsi_session_class); |
| transport_class_unregister(&iscsi_host_class); |
| class_unregister(&iscsi_transport_class); |
| } |
| |
| module_init(iscsi_transport_init); |
| module_exit(iscsi_transport_exit); |
| |
| MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
| "Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
| "Alex Aizman <itn780@yahoo.com>"); |
| MODULE_DESCRIPTION("iSCSI Transport Interface"); |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |