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849a8924a6
Conflicts in dec_esp.c (Thanks Bacchus), scsi_transport_iscsi.c and scsi_transport_fc.h Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1278 lines
35 KiB
C
1278 lines
35 KiB
C
/*
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* iSCSI transport class definitions
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*
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* Copyright (C) IBM Corporation, 2004
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* Copyright (C) Mike Christie, 2004 - 2005
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* Copyright (C) Dmitry Yusupov, 2004 - 2005
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* Copyright (C) Alex Aizman, 2004 - 2005
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/mempool.h>
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#include <net/tcp.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <scsi/iscsi_if.h>
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#define ISCSI_SESSION_ATTRS 8
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#define ISCSI_CONN_ATTRS 6
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struct iscsi_internal {
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struct scsi_transport_template t;
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struct iscsi_transport *iscsi_transport;
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struct list_head list;
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/*
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* List of sessions for this transport
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*/
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struct list_head sessions;
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/*
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* lock to serialize access to the sessions list which must
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* be taken after the rx_queue_sema
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*/
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spinlock_t session_lock;
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/*
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* based on transport capabilities, at register time we set these
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* bits to tell the transport class it wants attributes displayed
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* in sysfs or that it can support different iSCSI Data-Path
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* capabilities
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*/
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uint32_t param_mask;
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struct class_device cdev;
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/*
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* We do not have any private or other attrs.
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*/
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struct transport_container conn_cont;
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struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
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struct transport_container session_cont;
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struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
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};
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/*
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* list of registered transports and lock that must
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* be held while accessing list. The iscsi_transport_lock must
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* be acquired after the rx_queue_sema.
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*/
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static LIST_HEAD(iscsi_transports);
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static DEFINE_SPINLOCK(iscsi_transport_lock);
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#define to_iscsi_internal(tmpl) \
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container_of(tmpl, struct iscsi_internal, t)
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#define cdev_to_iscsi_internal(_cdev) \
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container_of(_cdev, struct iscsi_internal, cdev)
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static void iscsi_transport_release(struct class_device *cdev)
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{
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struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
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kfree(priv);
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}
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/*
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* iscsi_transport_class represents the iscsi_transports that are
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* registered.
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*/
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static struct class iscsi_transport_class = {
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.name = "iscsi_transport",
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.release = iscsi_transport_release,
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};
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static ssize_t
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show_transport_handle(struct class_device *cdev, char *buf)
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{
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struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
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return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
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}
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static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
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#define show_transport_attr(name, format) \
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static ssize_t \
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show_transport_##name(struct class_device *cdev, char *buf) \
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{ \
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struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
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return sprintf(buf, format"\n", priv->iscsi_transport->name); \
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} \
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static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
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show_transport_attr(caps, "0x%x");
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show_transport_attr(max_lun, "%d");
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show_transport_attr(max_conn, "%d");
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show_transport_attr(max_cmd_len, "%d");
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static struct attribute *iscsi_transport_attrs[] = {
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&class_device_attr_handle.attr,
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&class_device_attr_caps.attr,
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&class_device_attr_max_lun.attr,
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&class_device_attr_max_conn.attr,
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&class_device_attr_max_cmd_len.attr,
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NULL,
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};
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static struct attribute_group iscsi_transport_group = {
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.attrs = iscsi_transport_attrs,
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};
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static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
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"iscsi_session",
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NULL,
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NULL,
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NULL);
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static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
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"iscsi_connection",
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NULL,
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NULL,
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NULL);
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static struct sock *nls;
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static int daemon_pid;
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static DECLARE_MUTEX(rx_queue_sema);
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struct mempool_zone {
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mempool_t *pool;
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atomic_t allocated;
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int size;
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int hiwat;
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struct list_head freequeue;
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spinlock_t freelock;
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};
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static struct mempool_zone z_reply;
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/*
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* Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
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* Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
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* so daemon will notice OOM on NETLINK tranposrt level and will
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* be able to predict or change operational behavior
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*/
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#define Z_MAX_REPLY 8
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#define Z_HIWAT_REPLY 6
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#define Z_MAX_PDU 8
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#define Z_HIWAT_PDU 6
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#define Z_MAX_ERROR 16
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#define Z_HIWAT_ERROR 12
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struct iscsi_if_conn {
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struct list_head conn_list; /* item in connlist */
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struct list_head session_list; /* item in session->connections */
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iscsi_connh_t connh;
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int active; /* must be accessed with the connlock */
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struct Scsi_Host *host; /* originated shost */
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struct device dev; /* sysfs transport/container device */
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struct iscsi_transport *transport;
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struct mempool_zone z_error;
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struct mempool_zone z_pdu;
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struct list_head freequeue;
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};
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#define iscsi_dev_to_if_conn(_dev) \
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container_of(_dev, struct iscsi_if_conn, dev)
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#define iscsi_cdev_to_if_conn(_cdev) \
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iscsi_dev_to_if_conn(_cdev->dev)
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static LIST_HEAD(connlist);
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static DEFINE_SPINLOCK(connlock);
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struct iscsi_if_session {
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struct list_head list; /* item in session_list */
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struct list_head connections;
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iscsi_sessionh_t sessionh;
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struct iscsi_transport *transport;
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struct device dev; /* sysfs transport/container device */
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};
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#define iscsi_dev_to_if_session(_dev) \
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container_of(_dev, struct iscsi_if_session, dev)
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#define iscsi_cdev_to_if_session(_cdev) \
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iscsi_dev_to_if_session(_cdev->dev)
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#define iscsi_if_session_to_shost(_session) \
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dev_to_shost(_session->dev.parent)
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static struct iscsi_if_conn*
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iscsi_if_find_conn(uint64_t key)
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{
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unsigned long flags;
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struct iscsi_if_conn *conn;
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spin_lock_irqsave(&connlock, flags);
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list_for_each_entry(conn, &connlist, conn_list)
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if (conn->connh == key) {
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spin_unlock_irqrestore(&connlock, flags);
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return conn;
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}
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spin_unlock_irqrestore(&connlock, flags);
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return NULL;
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}
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static struct iscsi_internal *
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iscsi_if_transport_lookup(struct iscsi_transport *tt)
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{
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struct iscsi_internal *priv;
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unsigned long flags;
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spin_lock_irqsave(&iscsi_transport_lock, flags);
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list_for_each_entry(priv, &iscsi_transports, list) {
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if (tt == priv->iscsi_transport) {
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spin_unlock_irqrestore(&iscsi_transport_lock, flags);
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return priv;
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}
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}
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spin_unlock_irqrestore(&iscsi_transport_lock, flags);
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return NULL;
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}
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static inline struct list_head *skb_to_lh(struct sk_buff *skb)
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{
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return (struct list_head *)&skb->cb;
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}
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static void*
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mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data)
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{
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struct mempool_zone *zone = pool_data;
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return alloc_skb(zone->size, gfp_mask);
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}
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static void
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mempool_zone_free_skb(void *element, void *pool_data)
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{
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kfree_skb(element);
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}
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static void
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mempool_zone_complete(struct mempool_zone *zone)
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{
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unsigned long flags;
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struct list_head *lh, *n;
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spin_lock_irqsave(&zone->freelock, flags);
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list_for_each_safe(lh, n, &zone->freequeue) {
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struct sk_buff *skb = (struct sk_buff *)((char *)lh -
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offsetof(struct sk_buff, cb));
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if (!skb_shared(skb)) {
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list_del(skb_to_lh(skb));
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mempool_free(skb, zone->pool);
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atomic_dec(&zone->allocated);
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}
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}
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spin_unlock_irqrestore(&zone->freelock, flags);
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}
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static int
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mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size,
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unsigned hiwat)
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{
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zp->pool = mempool_create(max, mempool_zone_alloc_skb,
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mempool_zone_free_skb, zp);
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if (!zp->pool)
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return -ENOMEM;
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zp->size = size;
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zp->hiwat = hiwat;
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INIT_LIST_HEAD(&zp->freequeue);
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spin_lock_init(&zp->freelock);
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atomic_set(&zp->allocated, 0);
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return 0;
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}
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static struct sk_buff*
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mempool_zone_get_skb(struct mempool_zone *zone)
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{
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struct sk_buff *skb;
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skb = mempool_alloc(zone->pool, GFP_ATOMIC);
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if (skb)
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atomic_inc(&zone->allocated);
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return skb;
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}
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static int
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iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
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{
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unsigned long flags;
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int rc;
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skb_get(skb);
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rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
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if (rc < 0) {
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mempool_free(skb, zone->pool);
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printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
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return rc;
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}
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spin_lock_irqsave(&zone->freelock, flags);
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list_add(skb_to_lh(skb), &zone->freequeue);
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spin_unlock_irqrestore(&zone->freelock, flags);
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return 0;
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}
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int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr,
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char *data, uint32_t data_size)
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{
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struct nlmsghdr *nlh;
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struct sk_buff *skb;
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struct iscsi_uevent *ev;
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struct iscsi_if_conn *conn;
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char *pdu;
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int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
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data_size);
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conn = iscsi_if_find_conn(connh);
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BUG_ON(!conn);
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mempool_zone_complete(&conn->z_pdu);
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skb = mempool_zone_get_skb(&conn->z_pdu);
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if (!skb) {
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iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED);
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printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n",
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conn->host->host_no);
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return -ENOMEM;
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}
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nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
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ev = NLMSG_DATA(nlh);
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memset(ev, 0, sizeof(*ev));
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ev->transport_handle = iscsi_handle(conn->transport);
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ev->type = ISCSI_KEVENT_RECV_PDU;
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if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
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ev->iferror = -ENOMEM;
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ev->r.recv_req.conn_handle = connh;
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pdu = (char*)ev + sizeof(*ev);
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memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
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memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
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return iscsi_unicast_skb(&conn->z_pdu, skb);
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}
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EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
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void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error)
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{
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struct nlmsghdr *nlh;
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struct sk_buff *skb;
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struct iscsi_uevent *ev;
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struct iscsi_if_conn *conn;
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int len = NLMSG_SPACE(sizeof(*ev));
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conn = iscsi_if_find_conn(connh);
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BUG_ON(!conn);
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mempool_zone_complete(&conn->z_error);
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skb = mempool_zone_get_skb(&conn->z_error);
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if (!skb) {
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printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n",
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conn->host->host_no, error);
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return;
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}
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nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
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ev = NLMSG_DATA(nlh);
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ev->transport_handle = iscsi_handle(conn->transport);
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ev->type = ISCSI_KEVENT_CONN_ERROR;
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if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat)
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ev->iferror = -ENOMEM;
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ev->r.connerror.error = error;
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ev->r.connerror.conn_handle = connh;
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iscsi_unicast_skb(&conn->z_error, skb);
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printk(KERN_INFO "iscsi%d: detected conn error (%d)\n",
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conn->host->host_no, error);
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}
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EXPORT_SYMBOL_GPL(iscsi_conn_error);
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static int
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iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
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void *payload, int size)
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{
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struct sk_buff *skb;
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struct nlmsghdr *nlh;
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int len = NLMSG_SPACE(size);
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int flags = multi ? NLM_F_MULTI : 0;
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int t = done ? NLMSG_DONE : type;
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mempool_zone_complete(&z_reply);
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skb = mempool_zone_get_skb(&z_reply);
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/*
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* FIXME:
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* user is supposed to react on iferror == -ENOMEM;
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* see iscsi_if_rx().
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*/
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BUG_ON(!skb);
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nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
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nlh->nlmsg_flags = flags;
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memcpy(NLMSG_DATA(nlh), payload, size);
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return iscsi_unicast_skb(&z_reply, skb);
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}
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/*
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* iSCSI Session's hostdata organization:
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*
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* *------------------* <== host->hostdata
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* | transport |
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* |------------------| <== iscsi_hostdata(host->hostdata)
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* | transport's data |
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* |------------------| <== hostdata_session(host->hostdata)
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* | interface's data |
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* *------------------*
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*/
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#define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
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_t->hostdata_size % sizeof(unsigned long) + \
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sizeof(struct iscsi_if_session))
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#define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \
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((struct iscsi_transport *) \
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iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size)
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static void iscsi_if_session_dev_release(struct device *dev)
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{
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struct iscsi_if_session *session = iscsi_dev_to_if_session(dev);
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struct iscsi_transport *transport = session->transport;
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struct Scsi_Host *shost = iscsi_if_session_to_shost(session);
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struct iscsi_if_conn *conn, *tmp;
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unsigned long flags;
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/* now free connections */
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spin_lock_irqsave(&connlock, flags);
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list_for_each_entry_safe(conn, tmp, &session->connections,
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session_list) {
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list_del(&conn->session_list);
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mempool_destroy(conn->z_pdu.pool);
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mempool_destroy(conn->z_error.pool);
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kfree(conn);
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}
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spin_unlock_irqrestore(&connlock, flags);
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scsi_host_put(shost);
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module_put(transport->owner);
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}
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static int
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iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
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{
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struct iscsi_transport *transport = priv->iscsi_transport;
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struct iscsi_if_session *session;
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struct Scsi_Host *shost;
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unsigned long flags;
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int error;
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|
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if (!try_module_get(transport->owner))
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return -EPERM;
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|
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shost = scsi_host_alloc(transport->host_template,
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hostdata_privsize(transport));
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if (!shost) {
|
|
ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
|
|
printk(KERN_ERR "iscsi: can not allocate SCSI host for "
|
|
"session\n");
|
|
error = -ENOMEM;
|
|
goto out_module_put;
|
|
}
|
|
shost->max_id = 1;
|
|
shost->max_channel = 0;
|
|
shost->max_lun = transport->max_lun;
|
|
shost->max_cmd_len = transport->max_cmd_len;
|
|
shost->transportt = &priv->t;
|
|
|
|
/* store struct iscsi_transport in hostdata */
|
|
*(uint64_t*)shost->hostdata = ev->transport_handle;
|
|
|
|
ev->r.c_session_ret.session_handle = transport->create_session(
|
|
ev->u.c_session.initial_cmdsn, shost);
|
|
if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) {
|
|
error = 0;
|
|
goto out_host_put;
|
|
}
|
|
|
|
/* host_no becomes assigned SID */
|
|
ev->r.c_session_ret.sid = shost->host_no;
|
|
/* initialize session */
|
|
session = hostdata_session(shost->hostdata);
|
|
INIT_LIST_HEAD(&session->connections);
|
|
INIT_LIST_HEAD(&session->list);
|
|
session->sessionh = ev->r.c_session_ret.session_handle;
|
|
session->transport = transport;
|
|
|
|
error = scsi_add_host(shost, NULL);
|
|
if (error)
|
|
goto out_destroy_session;
|
|
|
|
/*
|
|
* this is released in the dev's release function)
|
|
*/
|
|
scsi_host_get(shost);
|
|
snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no);
|
|
session->dev.parent = &shost->shost_gendev;
|
|
session->dev.release = iscsi_if_session_dev_release;
|
|
error = device_register(&session->dev);
|
|
if (error) {
|
|
printk(KERN_ERR "iscsi: could not register session%d's dev\n",
|
|
shost->host_no);
|
|
goto out_remove_host;
|
|
}
|
|
transport_register_device(&session->dev);
|
|
|
|
/* add this session to the list of active sessions */
|
|
spin_lock_irqsave(&priv->session_lock, flags);
|
|
list_add(&session->list, &priv->sessions);
|
|
spin_unlock_irqrestore(&priv->session_lock, flags);
|
|
|
|
return 0;
|
|
|
|
out_remove_host:
|
|
scsi_remove_host(shost);
|
|
out_destroy_session:
|
|
transport->destroy_session(ev->r.c_session_ret.session_handle);
|
|
ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
|
|
out_host_put:
|
|
scsi_host_put(shost);
|
|
out_module_put:
|
|
module_put(transport->owner);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
|
|
{
|
|
struct iscsi_transport *transport = priv->iscsi_transport;
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_if_session *session;
|
|
unsigned long flags;
|
|
struct iscsi_if_conn *conn;
|
|
int error = 0;
|
|
|
|
shost = scsi_host_lookup(ev->u.d_session.sid);
|
|
if (shost == ERR_PTR(-ENXIO))
|
|
return -EEXIST;
|
|
session = hostdata_session(shost->hostdata);
|
|
|
|
/* check if we have active connections */
|
|
spin_lock_irqsave(&connlock, flags);
|
|
list_for_each_entry(conn, &session->connections, session_list) {
|
|
if (conn->active) {
|
|
printk(KERN_ERR "iscsi%d: can not destroy session: "
|
|
"has active connection (%p)\n",
|
|
shost->host_no, iscsi_ptr(conn->connh));
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
error = EIO;
|
|
goto out_release_ref;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
|
|
scsi_remove_host(shost);
|
|
transport->destroy_session(ev->u.d_session.session_handle);
|
|
transport_unregister_device(&session->dev);
|
|
device_unregister(&session->dev);
|
|
|
|
/* remove this session from the list of active sessions */
|
|
spin_lock_irqsave(&priv->session_lock, flags);
|
|
list_del(&session->list);
|
|
spin_unlock_irqrestore(&priv->session_lock, flags);
|
|
|
|
/* ref from host alloc */
|
|
scsi_host_put(shost);
|
|
out_release_ref:
|
|
/* ref from host lookup */
|
|
scsi_host_put(shost);
|
|
return error;
|
|
}
|
|
|
|
static void iscsi_if_conn_dev_release(struct device *dev)
|
|
{
|
|
struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev);
|
|
struct Scsi_Host *shost = conn->host;
|
|
|
|
scsi_host_put(shost);
|
|
}
|
|
|
|
static int
|
|
iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
|
|
{
|
|
struct iscsi_if_session *session;
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_if_conn *conn;
|
|
unsigned long flags;
|
|
int error;
|
|
|
|
shost = scsi_host_lookup(ev->u.c_conn.sid);
|
|
if (shost == ERR_PTR(-ENXIO))
|
|
return -EEXIST;
|
|
session = hostdata_session(shost->hostdata);
|
|
|
|
conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL);
|
|
if (!conn) {
|
|
error = -ENOMEM;
|
|
goto out_release_ref;
|
|
}
|
|
memset(conn, 0, sizeof(struct iscsi_if_conn));
|
|
INIT_LIST_HEAD(&conn->session_list);
|
|
INIT_LIST_HEAD(&conn->conn_list);
|
|
conn->host = shost;
|
|
conn->transport = transport;
|
|
|
|
error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU,
|
|
NLMSG_SPACE(sizeof(struct iscsi_uevent) +
|
|
sizeof(struct iscsi_hdr) +
|
|
DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
|
|
Z_HIWAT_PDU);
|
|
if (error) {
|
|
printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new "
|
|
"conn\n", shost->host_no);
|
|
goto out_free_conn;
|
|
}
|
|
error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR,
|
|
NLMSG_SPACE(sizeof(struct iscsi_uevent)),
|
|
Z_HIWAT_ERROR);
|
|
if (error) {
|
|
printk(KERN_ERR "iscsi%d: can not allocate error zone for "
|
|
"new conn\n", shost->host_no);
|
|
goto out_free_pdu_pool;
|
|
}
|
|
|
|
ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle,
|
|
ev->u.c_conn.cid);
|
|
if (!ev->r.handle) {
|
|
error = -ENODEV;
|
|
goto out_free_error_pool;
|
|
}
|
|
|
|
conn->connh = ev->r.handle;
|
|
|
|
/*
|
|
* this is released in the dev's release function
|
|
*/
|
|
if (!scsi_host_get(shost))
|
|
goto out_destroy_conn;
|
|
snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
|
|
shost->host_no, ev->u.c_conn.cid);
|
|
conn->dev.parent = &session->dev;
|
|
conn->dev.release = iscsi_if_conn_dev_release;
|
|
error = device_register(&conn->dev);
|
|
if (error) {
|
|
printk(KERN_ERR "iscsi%d: could not register connections%u "
|
|
"dev\n", shost->host_no, ev->u.c_conn.cid);
|
|
goto out_release_parent_ref;
|
|
}
|
|
transport_register_device(&conn->dev);
|
|
|
|
spin_lock_irqsave(&connlock, flags);
|
|
list_add(&conn->conn_list, &connlist);
|
|
list_add(&conn->session_list, &session->connections);
|
|
conn->active = 1;
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
|
|
scsi_host_put(shost);
|
|
return 0;
|
|
|
|
out_release_parent_ref:
|
|
scsi_host_put(shost);
|
|
out_destroy_conn:
|
|
transport->destroy_conn(ev->r.handle);
|
|
out_free_error_pool:
|
|
mempool_destroy(conn->z_error.pool);
|
|
out_free_pdu_pool:
|
|
mempool_destroy(conn->z_pdu.pool);
|
|
out_free_conn:
|
|
kfree(conn);
|
|
out_release_ref:
|
|
scsi_host_put(shost);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
|
|
{
|
|
unsigned long flags;
|
|
struct iscsi_if_conn *conn;
|
|
|
|
conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle);
|
|
if (!conn)
|
|
return -EEXIST;
|
|
|
|
transport->destroy_conn(ev->u.d_conn.conn_handle);
|
|
|
|
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;
|
|
}
|
|
|
|
static int
|
|
iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh)
|
|
{
|
|
struct iscsi_uevent *ev = NLMSG_DATA(nlh);
|
|
struct iscsi_stats *stats;
|
|
struct sk_buff *skbstat;
|
|
struct iscsi_if_conn *conn;
|
|
struct nlmsghdr *nlhstat;
|
|
struct iscsi_uevent *evstat;
|
|
int len = NLMSG_SPACE(sizeof(*ev) +
|
|
sizeof(struct iscsi_stats) +
|
|
sizeof(struct iscsi_stats_custom) *
|
|
ISCSI_STATS_CUSTOM_MAX);
|
|
int err = 0;
|
|
|
|
conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle);
|
|
if (!conn)
|
|
return -EEXIST;
|
|
|
|
do {
|
|
int actual_size;
|
|
|
|
mempool_zone_complete(&conn->z_pdu);
|
|
|
|
skbstat = mempool_zone_get_skb(&conn->z_pdu);
|
|
if (!skbstat) {
|
|
printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n",
|
|
conn->host->host_no);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nlhstat = __nlmsg_put(skbstat, 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;
|
|
if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
|
|
evstat->iferror = -ENOMEM;
|
|
evstat->u.get_stats.conn_handle =
|
|
ev->u.get_stats.conn_handle;
|
|
stats = (struct iscsi_stats *)
|
|
((char*)evstat + sizeof(*evstat));
|
|
memset(stats, 0, sizeof(*stats));
|
|
|
|
transport->get_stats(ev->u.get_stats.conn_handle, 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(skb, NLMSG_ALIGN(actual_size));
|
|
nlhstat->nlmsg_len = actual_size;
|
|
|
|
err = iscsi_unicast_skb(&conn->z_pdu, skbstat);
|
|
} while (err < 0 && err != -ECONNREFUSED);
|
|
|
|
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;
|
|
|
|
if (NETLINK_CREDS(skb)->uid)
|
|
return -EPERM;
|
|
|
|
priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
|
|
if (!priv)
|
|
return -EINVAL;
|
|
transport = priv->iscsi_transport;
|
|
|
|
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:
|
|
err = iscsi_if_destroy_session(priv, ev);
|
|
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:
|
|
if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle))
|
|
return -EEXIST;
|
|
ev->r.retcode = transport->bind_conn(
|
|
ev->u.b_conn.session_handle,
|
|
ev->u.b_conn.conn_handle,
|
|
ev->u.b_conn.transport_fd,
|
|
ev->u.b_conn.is_leading);
|
|
break;
|
|
case ISCSI_UEVENT_SET_PARAM:
|
|
if (!iscsi_if_find_conn(ev->u.set_param.conn_handle))
|
|
return -EEXIST;
|
|
ev->r.retcode = transport->set_param(
|
|
ev->u.set_param.conn_handle,
|
|
ev->u.set_param.param, ev->u.set_param.value);
|
|
break;
|
|
case ISCSI_UEVENT_START_CONN:
|
|
if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle))
|
|
return -EEXIST;
|
|
ev->r.retcode = transport->start_conn(
|
|
ev->u.start_conn.conn_handle);
|
|
break;
|
|
case ISCSI_UEVENT_STOP_CONN:
|
|
if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle))
|
|
return -EEXIST;
|
|
transport->stop_conn(ev->u.stop_conn.conn_handle,
|
|
ev->u.stop_conn.flag);
|
|
break;
|
|
case ISCSI_UEVENT_SEND_PDU:
|
|
if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle))
|
|
return -EEXIST;
|
|
ev->r.retcode = transport->send_pdu(
|
|
ev->u.send_pdu.conn_handle,
|
|
(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
|
|
(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
|
|
ev->u.send_pdu.data_size);
|
|
break;
|
|
case ISCSI_UEVENT_GET_STATS:
|
|
err = iscsi_if_get_stats(transport, skb, nlh);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
|
|
* processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
|
|
* discarded silently. */
|
|
static void
|
|
iscsi_if_rx(struct sock *sk, int len)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
down(&rx_queue_sema);
|
|
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
|
|
while (skb->len >= NLMSG_SPACE(0)) {
|
|
int err;
|
|
uint32_t rlen;
|
|
struct nlmsghdr *nlh;
|
|
struct iscsi_uevent *ev;
|
|
|
|
nlh = (struct nlmsghdr *)skb->data;
|
|
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));
|
|
if (atomic_read(&z_reply.allocated) >=
|
|
z_reply.hiwat)
|
|
ev->iferror = -ENOMEM;
|
|
} while (err < 0 && err != -ECONNREFUSED);
|
|
skb_pull(skb, rlen);
|
|
}
|
|
kfree_skb(skb);
|
|
}
|
|
up(&rx_queue_sema);
|
|
}
|
|
|
|
/*
|
|
* iSCSI connection attrs
|
|
*/
|
|
#define iscsi_conn_int_attr_show(param, format) \
|
|
static ssize_t \
|
|
show_conn_int_param_##param(struct class_device *cdev, char *buf) \
|
|
{ \
|
|
uint32_t value = 0; \
|
|
struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \
|
|
struct iscsi_internal *priv; \
|
|
\
|
|
priv = to_iscsi_internal(conn->host->transportt); \
|
|
if (priv->param_mask & (1 << param)) \
|
|
priv->iscsi_transport->get_param(conn->connh, param, &value); \
|
|
return snprintf(buf, 20, format"\n", value); \
|
|
}
|
|
|
|
#define iscsi_conn_int_attr(field, param, format) \
|
|
iscsi_conn_int_attr_show(param, format) \
|
|
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL);
|
|
|
|
iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
|
|
iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
|
|
iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
|
|
iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
|
|
iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
|
|
iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");
|
|
|
|
/*
|
|
* iSCSI session attrs
|
|
*/
|
|
#define iscsi_session_int_attr_show(param, format) \
|
|
static ssize_t \
|
|
show_session_int_param_##param(struct class_device *cdev, char *buf) \
|
|
{ \
|
|
uint32_t value = 0; \
|
|
struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \
|
|
struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \
|
|
struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
|
|
struct iscsi_if_conn *conn = NULL; \
|
|
unsigned long flags; \
|
|
\
|
|
spin_lock_irqsave(&connlock, flags); \
|
|
if (!list_empty(&session->connections)) \
|
|
conn = list_entry(session->connections.next, \
|
|
struct iscsi_if_conn, session_list); \
|
|
spin_unlock_irqrestore(&connlock, flags); \
|
|
\
|
|
if (conn && (priv->param_mask & (1 << param))) \
|
|
priv->iscsi_transport->get_param(conn->connh, param, &value);\
|
|
return snprintf(buf, 20, format"\n", value); \
|
|
}
|
|
|
|
#define iscsi_session_int_attr(field, param, format) \
|
|
iscsi_session_int_attr_show(param, format) \
|
|
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL);
|
|
|
|
iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
|
|
iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
|
|
iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
|
|
iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
|
|
iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
|
|
iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
|
|
iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
|
|
iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
|
|
|
|
#define SETUP_SESSION_RD_ATTR(field, param) \
|
|
if (priv->param_mask & (1 << param)) { \
|
|
priv->session_attrs[count] = &class_device_attr_##field;\
|
|
count++; \
|
|
}
|
|
|
|
#define SETUP_CONN_RD_ATTR(field, param) \
|
|
if (priv->param_mask & (1 << param)) { \
|
|
priv->conn_attrs[count] = &class_device_attr_##field; \
|
|
count++; \
|
|
}
|
|
|
|
static int iscsi_is_session_dev(const struct device *dev)
|
|
{
|
|
return dev->release == iscsi_if_session_dev_release;
|
|
}
|
|
|
|
static int iscsi_session_match(struct attribute_container *cont,
|
|
struct device *dev)
|
|
{
|
|
struct iscsi_if_session *session;
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_internal *priv;
|
|
|
|
if (!iscsi_is_session_dev(dev))
|
|
return 0;
|
|
|
|
session = iscsi_dev_to_if_session(dev);
|
|
shost = iscsi_if_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_is_conn_dev(const struct device *dev)
|
|
{
|
|
return dev->release == iscsi_if_conn_dev_release;
|
|
}
|
|
|
|
static int iscsi_conn_match(struct attribute_container *cont,
|
|
struct device *dev)
|
|
{
|
|
struct iscsi_if_conn *conn;
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_internal *priv;
|
|
|
|
if (!iscsi_is_conn_dev(dev))
|
|
return 0;
|
|
|
|
conn = iscsi_dev_to_if_conn(dev);
|
|
shost = conn->host;
|
|
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;
|
|
}
|
|
|
|
int 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 -EEXIST;
|
|
|
|
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
memset(priv, 0, sizeof(*priv));
|
|
INIT_LIST_HEAD(&priv->list);
|
|
INIT_LIST_HEAD(&priv->sessions);
|
|
spin_lock_init(&priv->session_lock);
|
|
priv->iscsi_transport = tt;
|
|
|
|
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;
|
|
|
|
/* setup parameters mask */
|
|
priv->param_mask = 0xFFFFFFFF;
|
|
if (!(tt->caps & CAP_MULTI_R2T))
|
|
priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T);
|
|
if (!(tt->caps & CAP_HDRDGST))
|
|
priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN);
|
|
if (!(tt->caps & CAP_DATADGST))
|
|
priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN);
|
|
if (!(tt->caps & CAP_MARKERS)) {
|
|
priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN);
|
|
priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN);
|
|
}
|
|
|
|
/* 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_PARAM_MAX_RECV_DLENGTH);
|
|
SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
|
|
SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN);
|
|
SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN);
|
|
SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN);
|
|
SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN);
|
|
|
|
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_PARAM_INITIAL_R2T_EN);
|
|
SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
|
|
SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
|
|
SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST);
|
|
SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST);
|
|
SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
|
|
SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN)
|
|
SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL);
|
|
|
|
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 0;
|
|
|
|
unregister_cdev:
|
|
class_device_unregister(&priv->cdev);
|
|
free_priv:
|
|
kfree(priv);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_register_transport);
|
|
|
|
int iscsi_unregister_transport(struct iscsi_transport *tt)
|
|
{
|
|
struct iscsi_internal *priv;
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!tt);
|
|
|
|
down(&rx_queue_sema);
|
|
|
|
priv = iscsi_if_transport_lookup(tt);
|
|
BUG_ON (!priv);
|
|
|
|
spin_lock_irqsave(&priv->session_lock, flags);
|
|
if (!list_empty(&priv->sessions)) {
|
|
spin_unlock_irqrestore(&priv->session_lock, flags);
|
|
up(&rx_queue_sema);
|
|
return -EPERM;
|
|
}
|
|
spin_unlock_irqrestore(&priv->session_lock, flags);
|
|
|
|
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);
|
|
|
|
sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
|
|
class_device_unregister(&priv->cdev);
|
|
up(&rx_queue_sema);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
|
|
|
|
static int
|
|
iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct netlink_notify *n = ptr;
|
|
|
|
if (event == NETLINK_URELEASE &&
|
|
n->protocol == NETLINK_ISCSI && n->pid) {
|
|
struct iscsi_if_conn *conn;
|
|
unsigned long flags;
|
|
|
|
mempool_zone_complete(&z_reply);
|
|
spin_lock_irqsave(&connlock, flags);
|
|
list_for_each_entry(conn, &connlist, conn_list) {
|
|
mempool_zone_complete(&conn->z_error);
|
|
mempool_zone_complete(&conn->z_pdu);
|
|
}
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block iscsi_nl_notifier = {
|
|
.notifier_call = iscsi_rcv_nl_event,
|
|
};
|
|
|
|
static __init int iscsi_transport_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = class_register(&iscsi_transport_class);
|
|
if (err)
|
|
return err;
|
|
|
|
err = transport_class_register(&iscsi_connection_class);
|
|
if (err)
|
|
goto unregister_transport_class;
|
|
|
|
err = transport_class_register(&iscsi_session_class);
|
|
if (err)
|
|
goto unregister_conn_class;
|
|
|
|
err = netlink_register_notifier(&iscsi_nl_notifier);
|
|
if (err)
|
|
goto unregister_session_class;
|
|
|
|
nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
|
|
THIS_MODULE);
|
|
if (!nls) {
|
|
err = -ENOBUFS;
|
|
goto unregister_notifier;
|
|
}
|
|
|
|
err = mempool_zone_init(&z_reply, Z_MAX_REPLY,
|
|
NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
|
|
if (!err)
|
|
return 0;
|
|
|
|
sock_release(nls->sk_socket);
|
|
unregister_notifier:
|
|
netlink_unregister_notifier(&iscsi_nl_notifier);
|
|
unregister_session_class:
|
|
transport_class_unregister(&iscsi_session_class);
|
|
unregister_conn_class:
|
|
transport_class_unregister(&iscsi_connection_class);
|
|
unregister_transport_class:
|
|
class_unregister(&iscsi_transport_class);
|
|
return err;
|
|
}
|
|
|
|
static void __exit iscsi_transport_exit(void)
|
|
{
|
|
mempool_destroy(z_reply.pool);
|
|
sock_release(nls->sk_socket);
|
|
netlink_unregister_notifier(&iscsi_nl_notifier);
|
|
transport_class_unregister(&iscsi_connection_class);
|
|
transport_class_unregister(&iscsi_session_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");
|