mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Kay Sievers](/assets/img/avatar_default.png)
[jejb: limit ioctl to returning 20 characters to avoid overrun on long device names and add a few more conversions] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2015 lines
54 KiB
C
2015 lines
54 KiB
C
/*
|
|
* 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 21
|
|
#define ISCSI_CONN_ATTRS 13
|
|
#define ISCSI_HOST_ATTRS 4
|
|
|
|
#define ISCSI_TRANSPORT_VERSION "2.0-870"
|
|
|
|
struct iscsi_internal {
|
|
int daemon_pid;
|
|
struct scsi_transport_template t;
|
|
struct iscsi_transport *iscsi_transport;
|
|
struct list_head list;
|
|
struct device dev;
|
|
|
|
struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
|
|
struct transport_container conn_cont;
|
|
struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
|
|
struct transport_container session_cont;
|
|
struct 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 dev_to_iscsi_internal(_dev) \
|
|
container_of(_dev, struct iscsi_internal, dev)
|
|
|
|
static void iscsi_transport_release(struct device *dev)
|
|
{
|
|
struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
|
|
kfree(priv);
|
|
}
|
|
|
|
/*
|
|
* iscsi_transport_class represents the iscsi_transports that are
|
|
* registered.
|
|
*/
|
|
static struct class iscsi_transport_class = {
|
|
.name = "iscsi_transport",
|
|
.dev_release = iscsi_transport_release,
|
|
};
|
|
|
|
static ssize_t
|
|
show_transport_handle(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
|
|
return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
|
|
}
|
|
static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
|
|
|
|
#define show_transport_attr(name, format) \
|
|
static ssize_t \
|
|
show_transport_##name(struct device *dev, \
|
|
struct device_attribute *attr,char *buf) \
|
|
{ \
|
|
struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
|
|
return sprintf(buf, format"\n", priv->iscsi_transport->name); \
|
|
} \
|
|
static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
|
|
|
|
show_transport_attr(caps, "0x%x");
|
|
|
|
static struct attribute *iscsi_transport_attrs[] = {
|
|
&dev_attr_handle.attr,
|
|
&dev_attr_caps.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group iscsi_transport_group = {
|
|
.attrs = iscsi_transport_attrs,
|
|
};
|
|
|
|
/*
|
|
* iSCSI endpoint attrs
|
|
*/
|
|
#define iscsi_dev_to_endpoint(_dev) \
|
|
container_of(_dev, struct iscsi_endpoint, dev)
|
|
|
|
#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
|
|
struct device_attribute dev_attr_##_prefix##_##_name = \
|
|
__ATTR(_name,_mode,_show,_store)
|
|
|
|
static void iscsi_endpoint_release(struct device *dev)
|
|
{
|
|
struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
|
|
kfree(ep);
|
|
}
|
|
|
|
static struct class iscsi_endpoint_class = {
|
|
.name = "iscsi_endpoint",
|
|
.dev_release = iscsi_endpoint_release,
|
|
};
|
|
|
|
static ssize_t
|
|
show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
|
|
return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
|
|
}
|
|
static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
|
|
|
|
static struct attribute *iscsi_endpoint_attrs[] = {
|
|
&dev_attr_ep_handle.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group iscsi_endpoint_group = {
|
|
.attrs = iscsi_endpoint_attrs,
|
|
};
|
|
|
|
#define ISCSI_MAX_EPID -1
|
|
|
|
static int iscsi_match_epid(struct device *dev, void *data)
|
|
{
|
|
struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
|
|
uint64_t *epid = (uint64_t *) data;
|
|
|
|
return *epid == ep->id;
|
|
}
|
|
|
|
struct iscsi_endpoint *
|
|
iscsi_create_endpoint(int dd_size)
|
|
{
|
|
struct device *dev;
|
|
struct iscsi_endpoint *ep;
|
|
uint64_t id;
|
|
int err;
|
|
|
|
for (id = 1; id < ISCSI_MAX_EPID; id++) {
|
|
dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
|
|
iscsi_match_epid);
|
|
if (!dev)
|
|
break;
|
|
}
|
|
if (id == ISCSI_MAX_EPID) {
|
|
printk(KERN_ERR "Too many connections. Max supported %u\n",
|
|
ISCSI_MAX_EPID - 1);
|
|
return NULL;
|
|
}
|
|
|
|
ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
|
|
if (!ep)
|
|
return NULL;
|
|
|
|
ep->id = id;
|
|
ep->dev.class = &iscsi_endpoint_class;
|
|
dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
|
|
err = device_register(&ep->dev);
|
|
if (err)
|
|
goto free_ep;
|
|
|
|
err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
|
|
if (err)
|
|
goto unregister_dev;
|
|
|
|
if (dd_size)
|
|
ep->dd_data = &ep[1];
|
|
return ep;
|
|
|
|
unregister_dev:
|
|
device_unregister(&ep->dev);
|
|
return NULL;
|
|
|
|
free_ep:
|
|
kfree(ep);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
|
|
|
|
void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
|
|
{
|
|
sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
|
|
device_unregister(&ep->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
|
|
|
|
struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
|
|
{
|
|
struct iscsi_endpoint *ep;
|
|
struct device *dev;
|
|
|
|
dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
|
|
iscsi_match_epid);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
ep = iscsi_dev_to_endpoint(dev);
|
|
/*
|
|
* we can drop this now because the interface will prevent
|
|
* removals and lookups from racing.
|
|
*/
|
|
put_device(dev);
|
|
return ep;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
|
|
|
|
static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
|
|
struct device *cdev)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(dev);
|
|
struct iscsi_cls_host *ihost = shost->shost_data;
|
|
|
|
memset(ihost, 0, sizeof(*ihost));
|
|
atomic_set(&ihost->nr_scans, 0);
|
|
mutex_init(&ihost->mutex);
|
|
|
|
snprintf(ihost->scan_workq_name, sizeof(ihost->scan_workq_name),
|
|
"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 device *cdev)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(dev);
|
|
struct iscsi_cls_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" },
|
|
};
|
|
|
|
static 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_TRANSPORT_DISRUPTED << 16;
|
|
break;
|
|
case ISCSI_SESSION_FREE:
|
|
err = DID_TRANSPORT_FAILFAST << 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;
|
|
}
|
|
|
|
static int iscsi_iter_session_fn(struct device *dev, void *data)
|
|
{
|
|
void (* fn) (struct iscsi_cls_session *) = data;
|
|
|
|
if (!iscsi_is_session_dev(dev))
|
|
return 0;
|
|
fn(iscsi_dev_to_session(dev));
|
|
return 0;
|
|
}
|
|
|
|
void iscsi_host_for_each_session(struct Scsi_Host *shost,
|
|
void (*fn)(struct iscsi_cls_session *))
|
|
{
|
|
device_for_each_child(&shost->shost_gendev, fn,
|
|
iscsi_iter_session_fn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
|
|
|
|
/**
|
|
* 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_cls_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);
|
|
|
|
struct iscsi_scan_data {
|
|
unsigned int channel;
|
|
unsigned int id;
|
|
unsigned int lun;
|
|
};
|
|
|
|
static int iscsi_user_scan_session(struct device *dev, void *data)
|
|
{
|
|
struct iscsi_scan_data *scan_data = data;
|
|
struct iscsi_cls_session *session;
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_cls_host *ihost;
|
|
unsigned long flags;
|
|
unsigned int id;
|
|
|
|
if (!iscsi_is_session_dev(dev))
|
|
return 0;
|
|
|
|
session = iscsi_dev_to_session(dev);
|
|
shost = iscsi_session_to_shost(session);
|
|
ihost = shost->shost_data;
|
|
|
|
mutex_lock(&ihost->mutex);
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
if (session->state != ISCSI_SESSION_LOGGED_IN) {
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
mutex_unlock(&ihost->mutex);
|
|
return 0;
|
|
}
|
|
id = session->target_id;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
|
|
if (id != ISCSI_MAX_TARGET) {
|
|
if ((scan_data->channel == SCAN_WILD_CARD ||
|
|
scan_data->channel == 0) &&
|
|
(scan_data->id == SCAN_WILD_CARD ||
|
|
scan_data->id == id))
|
|
scsi_scan_target(&session->dev, 0, id,
|
|
scan_data->lun, 1);
|
|
}
|
|
mutex_unlock(&ihost->mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
|
|
uint id, uint lun)
|
|
{
|
|
struct iscsi_scan_data scan_data;
|
|
|
|
scan_data.channel = channel;
|
|
scan_data.id = id;
|
|
scan_data.lun = lun;
|
|
|
|
return device_for_each_child(&shost->shost_gendev, &scan_data,
|
|
iscsi_user_scan_session);
|
|
}
|
|
|
|
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_cls_host *ihost = shost->shost_data;
|
|
struct iscsi_scan_data scan_data;
|
|
|
|
scan_data.channel = 0;
|
|
scan_data.id = SCAN_WILD_CARD;
|
|
scan_data.lun = SCAN_WILD_CARD;
|
|
|
|
iscsi_user_scan_session(&session->dev, &scan_data);
|
|
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;
|
|
|
|
iscsi_cls_session_printk(KERN_INFO, session,
|
|
"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);
|
|
}
|
|
|
|
static void __iscsi_unblock_session(struct work_struct *work)
|
|
{
|
|
struct iscsi_cls_session *session =
|
|
container_of(work, struct iscsi_cls_session,
|
|
unblock_work);
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(session);
|
|
struct iscsi_cls_host *ihost = shost->shost_data;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* The recovery and unblock work get run from the same workqueue,
|
|
* so try to cancel it if it was going to run after this unblock.
|
|
*/
|
|
cancel_delayed_work(&session->recovery_work);
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
session->state = ISCSI_SESSION_LOGGED_IN;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
/* start IO */
|
|
scsi_target_unblock(&session->dev);
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* iscsi_unblock_session - set a session as logged in and start IO.
|
|
* @session: iscsi session
|
|
*
|
|
* Mark a session as ready to accept IO.
|
|
*/
|
|
void iscsi_unblock_session(struct iscsi_cls_session *session)
|
|
{
|
|
queue_work(iscsi_eh_timer_workq, &session->unblock_work);
|
|
/*
|
|
* make sure all the events have completed before tell the driver
|
|
* it is safe
|
|
*/
|
|
flush_workqueue(iscsi_eh_timer_workq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_unblock_session);
|
|
|
|
static void __iscsi_block_session(struct work_struct *work)
|
|
{
|
|
struct iscsi_cls_session *session =
|
|
container_of(work, struct iscsi_cls_session,
|
|
block_work);
|
|
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);
|
|
}
|
|
|
|
void iscsi_block_session(struct iscsi_cls_session *session)
|
|
{
|
|
queue_work(iscsi_eh_timer_workq, &session->block_work);
|
|
}
|
|
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_cls_host *ihost = shost->shost_data;
|
|
unsigned long flags;
|
|
|
|
/* Prevent new scans and make sure scanning is not in progress */
|
|
mutex_lock(&ihost->mutex);
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
if (session->target_id == ISCSI_MAX_TARGET) {
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
mutex_unlock(&ihost->mutex);
|
|
return;
|
|
}
|
|
session->target_id = ISCSI_MAX_TARGET;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
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_cls_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,
|
|
int dd_size)
|
|
{
|
|
struct iscsi_cls_session *session;
|
|
|
|
session = kzalloc(sizeof(*session) + dd_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->sess_list);
|
|
INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
|
|
INIT_WORK(&session->block_work, __iscsi_block_session);
|
|
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 (dd_size)
|
|
session->dd_data = &session[1];
|
|
return session;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_alloc_session);
|
|
|
|
static int iscsi_get_next_target_id(struct device *dev, void *data)
|
|
{
|
|
struct iscsi_cls_session *session;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
|
|
if (!iscsi_is_session_dev(dev))
|
|
return 0;
|
|
|
|
session = iscsi_dev_to_session(dev);
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
if (*((unsigned int *) data) == session->target_id)
|
|
err = -EEXIST;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
return err;
|
|
}
|
|
|
|
int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(session);
|
|
struct iscsi_cls_host *ihost;
|
|
unsigned long flags;
|
|
unsigned int id = target_id;
|
|
int err;
|
|
|
|
ihost = shost->shost_data;
|
|
session->sid = atomic_add_return(1, &iscsi_session_nr);
|
|
|
|
if (id == ISCSI_MAX_TARGET) {
|
|
for (id = 0; id < ISCSI_MAX_TARGET; id++) {
|
|
err = device_for_each_child(&shost->shost_gendev, &id,
|
|
iscsi_get_next_target_id);
|
|
if (!err)
|
|
break;
|
|
}
|
|
|
|
if (id == ISCSI_MAX_TARGET) {
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"Too many iscsi targets. Max "
|
|
"number of targets is %d.\n",
|
|
ISCSI_MAX_TARGET - 1);
|
|
goto release_host;
|
|
}
|
|
}
|
|
session->target_id = id;
|
|
|
|
dev_set_name(&session->dev, "session%u", session->sid);
|
|
err = device_add(&session->dev);
|
|
if (err) {
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"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);
|
|
|
|
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
|
|
* @dd_size: private driver data size
|
|
* @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,
|
|
int dd_size, unsigned int target_id)
|
|
{
|
|
struct iscsi_cls_session *session;
|
|
|
|
session = iscsi_alloc_session(shost, transport, dd_size);
|
|
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_cls_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);
|
|
|
|
/* make sure there are no blocks/unblocks queued */
|
|
flush_workqueue(iscsi_eh_timer_workq);
|
|
/* make sure the timedout callout is not running */
|
|
if (!cancel_delayed_work(&session->recovery_work))
|
|
flush_workqueue(iscsi_eh_timer_workq);
|
|
/*
|
|
* If we are blocked let commands flow again. The lld or iscsi
|
|
* layer should set up the queuecommand to fail commands.
|
|
* We assume that LLD will not be calling block/unblock while
|
|
* removing the session.
|
|
*/
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
session->state = ISCSI_SESSION_FREE;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
|
|
scsi_target_unblock(&session->dev);
|
|
/* flush running scans then delete devices */
|
|
flush_workqueue(ihost->scan_workq);
|
|
__iscsi_unbind_session(&session->unbind_work);
|
|
|
|
/* 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)
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"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
|
|
* @dd_size: private driver data size
|
|
* @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, int dd_size, uint32_t cid)
|
|
{
|
|
struct iscsi_transport *transport = session->transport;
|
|
struct iscsi_cls_conn *conn;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
|
|
if (!conn)
|
|
return NULL;
|
|
if (dd_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;
|
|
|
|
dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
|
|
conn->dev.parent = &session->dev;
|
|
conn->dev.release = iscsi_conn_release;
|
|
err = device_register(&conn->dev);
|
|
if (err) {
|
|
iscsi_cls_session_printk(KERN_ERR, session, "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_event(conn, ISCSI_ERR_CONN_FAILED);
|
|
iscsi_cls_conn_printk(KERN_ERR, conn, "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_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
struct iscsi_uevent *ev;
|
|
struct iscsi_internal *priv;
|
|
int len = NLMSG_SPACE(sizeof(*ev));
|
|
|
|
priv = iscsi_if_transport_lookup(conn->transport);
|
|
if (!priv)
|
|
return;
|
|
|
|
skb = alloc_skb(len, GFP_ATOMIC);
|
|
if (!skb) {
|
|
iscsi_cls_conn_printk(KERN_ERR, conn, "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);
|
|
|
|
iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
|
|
error);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
|
|
|
|
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) {
|
|
iscsi_cls_conn_printk(KERN_ERR, conn, "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) {
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"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:
|
|
iscsi_cls_session_printk(KERN_ERR, session, "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)
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"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_endpoint *ep,
|
|
struct iscsi_uevent *ev, uint32_t initial_cmdsn,
|
|
uint16_t cmds_max, uint16_t queue_depth)
|
|
{
|
|
struct iscsi_transport *transport = priv->iscsi_transport;
|
|
struct iscsi_cls_session *session;
|
|
uint32_t host_no;
|
|
|
|
session = transport->create_session(ep, cmds_max, queue_depth,
|
|
initial_cmdsn, &host_no);
|
|
if (!session)
|
|
return -ENOMEM;
|
|
|
|
ev->r.c_session_ret.host_no = host_no;
|
|
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) {
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"couldn't create a new connection.");
|
|
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 iscsi_endpoint *ep;
|
|
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));
|
|
ep = transport->ep_connect(dst_addr,
|
|
ev->u.ep_connect.non_blocking);
|
|
if (IS_ERR(ep))
|
|
return PTR_ERR(ep);
|
|
|
|
ev->r.ep_connect_ret.handle = ep->id;
|
|
break;
|
|
case ISCSI_UEVENT_TRANSPORT_EP_POLL:
|
|
if (!transport->ep_poll)
|
|
return -EINVAL;
|
|
|
|
ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
|
|
if (!ep)
|
|
return -EINVAL;
|
|
|
|
ev->r.retcode = transport->ep_poll(ep,
|
|
ev->u.ep_poll.timeout_ms);
|
|
break;
|
|
case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
|
|
if (!transport->ep_disconnect)
|
|
return -EINVAL;
|
|
|
|
ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
|
|
if (!ep)
|
|
return -EINVAL;
|
|
|
|
transport->ep_disconnect(ep);
|
|
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 (!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 (!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;
|
|
struct iscsi_endpoint *ep = NULL;
|
|
|
|
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, ep, ev,
|
|
ev->u.c_session.initial_cmdsn,
|
|
ev->u.c_session.cmds_max,
|
|
ev->u.c_session.queue_depth);
|
|
break;
|
|
case ISCSI_UEVENT_CREATE_BOUND_SESSION:
|
|
ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
|
|
if (!ep) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
err = iscsi_if_create_session(priv, ep, ev,
|
|
ev->u.c_bound_session.initial_cmdsn,
|
|
ev->u.c_bound_session.cmds_max,
|
|
ev->u.c_bound_session.queue_depth);
|
|
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_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
|
|
struct device_attribute dev_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 device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
|
|
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);
|
|
|
|
/*
|
|
* iSCSI session attrs
|
|
*/
|
|
#define iscsi_session_attr_show(param, perm) \
|
|
static ssize_t \
|
|
show_session_param_##param(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct iscsi_cls_session *session = \
|
|
iscsi_dev_to_session(dev->parent); \
|
|
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);
|
|
iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
|
|
iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
|
|
|
|
static ssize_t
|
|
show_priv_session_state(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
|
|
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 device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct iscsi_cls_session *session = \
|
|
iscsi_dev_to_session(dev->parent); \
|
|
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 device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct Scsi_Host *shost = transport_class_to_shost(dev); \
|
|
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] = &dev_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] = &dev_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] = &dev_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] = &dev_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;
|
|
if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
|
|
priv->t.create_work_queue = 1;
|
|
|
|
priv->dev.class = &iscsi_transport_class;
|
|
dev_set_name(&priv->dev, "%s", tt->name);
|
|
err = device_register(&priv->dev);
|
|
if (err)
|
|
goto free_priv;
|
|
|
|
err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
|
|
if (err)
|
|
goto unregister_dev;
|
|
|
|
/* 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_cls_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_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
|
|
SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
|
|
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_dev:
|
|
device_unregister(&priv->dev);
|
|
return NULL;
|
|
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->dev.kobj, &iscsi_transport_group);
|
|
device_unregister(&priv->dev);
|
|
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 = class_register(&iscsi_endpoint_class);
|
|
if (err)
|
|
goto unregister_transport_class;
|
|
|
|
err = transport_class_register(&iscsi_host_class);
|
|
if (err)
|
|
goto unregister_endpoint_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_endpoint_class:
|
|
class_unregister(&iscsi_endpoint_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_endpoint_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);
|