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-----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQEcBAABAgAGBQJPBh1uAAoJEDeqqVYsXL0MnxIIAJl0SLxgX3Vo18jhv7epNaUy Akm8VcLTjW99IAZm1x166pGjLvdeZJC5A50DxW3jQMknKYZyyxEmTGOOMVA/LuCS J3V18tMrsEA7i1kEGx2MauRRNAvReAZl4a/nHuRc+hpVmfyQegBv1v4V0v0gzD5I MDZSSksqtXpJhsHt2B4g/jao7RhuJYXw7NidRGzEtksax3NMyWzaIb/75Uq6eenE HwJwCUgZZxxfRKksj/T8ShRE6BKL9wcvrm8SVNjBYF2OpnMUNCXtfLQ4fqbHtGz2 otWvoQxVERehPZhTWHk6QnLgPwBWYyIUK7ErSFMTb9EK8b3FsEZkw6/LlS/lXnI= =Zopk -----END PGP SIGNATURE----- Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 SCSI updates for post 3.2 merge window * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (67 commits) [SCSI] lpfc 8.3.28: Update driver version to 8.3.28 [SCSI] lpfc 8.3.28: Add Loopback support for SLI4 adapters [SCSI] lpfc 8.3.28: Critical Miscellaneous fixes [SCSI] Lpfc 8.3.28: FC and SCSI Discovery Fixes [SCSI] lpfc 8.3.28: Add support for ABTS failure handling [SCSI] lpfc 8.3.28: SLI fixes and added SLI4 support [SCSI] lpfc 8.3.28: Miscellaneous fixes in sysfs and mgmt interfaces [SCSI] mpt2sas: Removed redundant calling of _scsih_probe_devices() from _scsih_probe [SCSI] mac_scsi: Remove obsolete IRQ_FLG_* users [SCSI] qla4xxx: Update driver version to 5.02.00-k10 [SCSI] qla4xxx: check for FW alive before calling chip_reset [SCSI] qla4xxx: Fix qla4xxx_dump_buffer to dump buffer correctly [SCSI] qla4xxx: Fix the IDC locking mechanism [SCSI] qla4xxx: Wait for disable_acb before doing set_acb [SCSI] qla4xxx: Don't recover adapter if device state is FAILED [SCSI] qla4xxx: fix call trace on rmmod with ql4xdontresethba=1 [SCSI] qla4xxx: Fix CPU lockups when ql4xdontresethba set [SCSI] qla4xxx: Perform context resets in case of context failures. [SCSI] iscsi class: export pid of process that created [SCSI] mpt2sas: Remove unused duplicate diag_buffer_enable param ...
2761 lines
76 KiB
C
2761 lines
76 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/mutex.h>
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#include <linux/slab.h>
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#include <linux/bsg-lib.h>
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#include <linux/idr.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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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_bsg_iscsi.h>
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#define ISCSI_TRANSPORT_VERSION "2.0-870"
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static int dbg_session;
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module_param_named(debug_session, dbg_session, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_session,
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"Turn on debugging for sessions in scsi_transport_iscsi "
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"module. Set to 1 to turn on, and zero to turn off. Default "
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"is off.");
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static int dbg_conn;
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module_param_named(debug_conn, dbg_conn, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_conn,
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"Turn on debugging for connections in scsi_transport_iscsi "
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"module. Set to 1 to turn on, and zero to turn off. Default "
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"is off.");
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#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
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do { \
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if (dbg_session) \
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iscsi_cls_session_printk(KERN_INFO, _session, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
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do { \
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if (dbg_conn) \
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iscsi_cls_conn_printk(KERN_INFO, _conn, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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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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struct device dev;
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struct transport_container conn_cont;
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struct transport_container session_cont;
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};
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static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
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static struct workqueue_struct *iscsi_eh_timer_workq;
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static DEFINE_IDA(iscsi_sess_ida);
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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_mutex.
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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 dev_to_iscsi_internal(_dev) \
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container_of(_dev, struct iscsi_internal, dev)
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static void iscsi_transport_release(struct device *dev)
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{
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struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
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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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.dev_release = iscsi_transport_release,
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};
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static ssize_t
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show_transport_handle(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
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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 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 device *dev, \
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struct device_attribute *attr,char *buf) \
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{ \
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struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
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return sprintf(buf, format"\n", priv->iscsi_transport->name); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
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show_transport_attr(caps, "0x%x");
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static struct attribute *iscsi_transport_attrs[] = {
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&dev_attr_handle.attr,
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&dev_attr_caps.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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/*
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* iSCSI endpoint attrs
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*/
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#define iscsi_dev_to_endpoint(_dev) \
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container_of(_dev, struct iscsi_endpoint, dev)
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#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
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struct device_attribute dev_attr_##_prefix##_##_name = \
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__ATTR(_name,_mode,_show,_store)
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static void iscsi_endpoint_release(struct device *dev)
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{
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struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
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kfree(ep);
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}
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static struct class iscsi_endpoint_class = {
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.name = "iscsi_endpoint",
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.dev_release = iscsi_endpoint_release,
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};
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static ssize_t
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show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
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return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
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}
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static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
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static struct attribute *iscsi_endpoint_attrs[] = {
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&dev_attr_ep_handle.attr,
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NULL,
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};
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static struct attribute_group iscsi_endpoint_group = {
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.attrs = iscsi_endpoint_attrs,
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};
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#define ISCSI_MAX_EPID -1
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static int iscsi_match_epid(struct device *dev, void *data)
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{
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struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
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uint64_t *epid = (uint64_t *) data;
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return *epid == ep->id;
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}
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struct iscsi_endpoint *
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iscsi_create_endpoint(int dd_size)
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{
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struct device *dev;
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struct iscsi_endpoint *ep;
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uint64_t id;
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int err;
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for (id = 1; id < ISCSI_MAX_EPID; id++) {
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dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
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iscsi_match_epid);
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if (!dev)
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break;
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}
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if (id == ISCSI_MAX_EPID) {
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printk(KERN_ERR "Too many connections. Max supported %u\n",
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ISCSI_MAX_EPID - 1);
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return NULL;
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}
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ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
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if (!ep)
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return NULL;
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ep->id = id;
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ep->dev.class = &iscsi_endpoint_class;
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dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
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err = device_register(&ep->dev);
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if (err)
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goto free_ep;
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err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
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if (err)
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goto unregister_dev;
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if (dd_size)
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ep->dd_data = &ep[1];
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return ep;
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unregister_dev:
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device_unregister(&ep->dev);
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return NULL;
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free_ep:
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kfree(ep);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
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void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
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{
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sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
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device_unregister(&ep->dev);
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}
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EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
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struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
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{
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struct iscsi_endpoint *ep;
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struct device *dev;
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dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
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iscsi_match_epid);
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if (!dev)
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return NULL;
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ep = iscsi_dev_to_endpoint(dev);
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/*
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* we can drop this now because the interface will prevent
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* removals and lookups from racing.
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*/
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put_device(dev);
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return ep;
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}
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EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
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/*
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* Interface to display network param to sysfs
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*/
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static void iscsi_iface_release(struct device *dev)
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{
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struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
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struct device *parent = iface->dev.parent;
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kfree(iface);
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put_device(parent);
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}
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static struct class iscsi_iface_class = {
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.name = "iscsi_iface",
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.dev_release = iscsi_iface_release,
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};
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#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
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struct device_attribute dev_attr_##_prefix##_##_name = \
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__ATTR(_name, _mode, _show, _store)
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/* iface attrs show */
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#define iscsi_iface_attr_show(type, name, param_type, param) \
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static ssize_t \
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show_##type##_##name(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
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struct iscsi_transport *t = iface->transport; \
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return t->get_iface_param(iface, param_type, param, buf); \
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} \
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#define iscsi_iface_net_attr(type, name, param) \
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iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
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static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
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/* generic read only ipvi4 attribute */
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iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
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iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
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iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
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iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
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/* generic read only ipv6 attribute */
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iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
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iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
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iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
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iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
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ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
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iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
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ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
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/* common read only iface attribute */
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iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
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iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
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iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
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iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
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iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
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iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
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static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int i)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
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struct iscsi_transport *t = iface->transport;
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int param;
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if (attr == &dev_attr_iface_enabled.attr)
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param = ISCSI_NET_PARAM_IFACE_ENABLE;
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else if (attr == &dev_attr_iface_vlan_id.attr)
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param = ISCSI_NET_PARAM_VLAN_ID;
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else if (attr == &dev_attr_iface_vlan_priority.attr)
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param = ISCSI_NET_PARAM_VLAN_PRIORITY;
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else if (attr == &dev_attr_iface_vlan_enabled.attr)
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param = ISCSI_NET_PARAM_VLAN_ENABLED;
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else if (attr == &dev_attr_iface_mtu.attr)
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param = ISCSI_NET_PARAM_MTU;
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else if (attr == &dev_attr_iface_port.attr)
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param = ISCSI_NET_PARAM_PORT;
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else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
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if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
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param = ISCSI_NET_PARAM_IPV4_ADDR;
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else if (attr == &dev_attr_ipv4_iface_gateway.attr)
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param = ISCSI_NET_PARAM_IPV4_GW;
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else if (attr == &dev_attr_ipv4_iface_subnet.attr)
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param = ISCSI_NET_PARAM_IPV4_SUBNET;
|
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else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
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param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
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else
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return 0;
|
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} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
|
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if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
|
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param = ISCSI_NET_PARAM_IPV6_ADDR;
|
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else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
|
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param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
|
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else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
|
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param = ISCSI_NET_PARAM_IPV6_ROUTER;
|
|
else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
|
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param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
|
|
else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
|
|
param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
|
|
else
|
|
return 0;
|
|
} else {
|
|
WARN_ONCE(1, "Invalid iface attr");
|
|
return 0;
|
|
}
|
|
|
|
return t->attr_is_visible(ISCSI_NET_PARAM, param);
|
|
}
|
|
|
|
static struct attribute *iscsi_iface_attrs[] = {
|
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&dev_attr_iface_enabled.attr,
|
|
&dev_attr_iface_vlan_id.attr,
|
|
&dev_attr_iface_vlan_priority.attr,
|
|
&dev_attr_iface_vlan_enabled.attr,
|
|
&dev_attr_ipv4_iface_ipaddress.attr,
|
|
&dev_attr_ipv4_iface_gateway.attr,
|
|
&dev_attr_ipv4_iface_subnet.attr,
|
|
&dev_attr_ipv4_iface_bootproto.attr,
|
|
&dev_attr_ipv6_iface_ipaddress.attr,
|
|
&dev_attr_ipv6_iface_link_local_addr.attr,
|
|
&dev_attr_ipv6_iface_router_addr.attr,
|
|
&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
|
|
&dev_attr_ipv6_iface_link_local_autocfg.attr,
|
|
&dev_attr_iface_mtu.attr,
|
|
&dev_attr_iface_port.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group iscsi_iface_group = {
|
|
.attrs = iscsi_iface_attrs,
|
|
.is_visible = iscsi_iface_attr_is_visible,
|
|
};
|
|
|
|
struct iscsi_iface *
|
|
iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
|
|
uint32_t iface_type, uint32_t iface_num, int dd_size)
|
|
{
|
|
struct iscsi_iface *iface;
|
|
int err;
|
|
|
|
iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
|
|
if (!iface)
|
|
return NULL;
|
|
|
|
iface->transport = transport;
|
|
iface->iface_type = iface_type;
|
|
iface->iface_num = iface_num;
|
|
iface->dev.release = iscsi_iface_release;
|
|
iface->dev.class = &iscsi_iface_class;
|
|
/* parent reference released in iscsi_iface_release */
|
|
iface->dev.parent = get_device(&shost->shost_gendev);
|
|
if (iface_type == ISCSI_IFACE_TYPE_IPV4)
|
|
dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
|
|
iface_num);
|
|
else
|
|
dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
|
|
iface_num);
|
|
|
|
err = device_register(&iface->dev);
|
|
if (err)
|
|
goto free_iface;
|
|
|
|
err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
|
|
if (err)
|
|
goto unreg_iface;
|
|
|
|
if (dd_size)
|
|
iface->dd_data = &iface[1];
|
|
return iface;
|
|
|
|
unreg_iface:
|
|
device_unregister(&iface->dev);
|
|
return NULL;
|
|
|
|
free_iface:
|
|
put_device(iface->dev.parent);
|
|
kfree(iface);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_create_iface);
|
|
|
|
void iscsi_destroy_iface(struct iscsi_iface *iface)
|
|
{
|
|
sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
|
|
device_unregister(&iface->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
|
|
|
|
/*
|
|
* BSG support
|
|
*/
|
|
/**
|
|
* iscsi_bsg_host_dispatch - Dispatch command to LLD.
|
|
* @job: bsg job to be processed
|
|
*/
|
|
static int iscsi_bsg_host_dispatch(struct bsg_job *job)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_job_to_shost(job);
|
|
struct iscsi_bsg_request *req = job->request;
|
|
struct iscsi_bsg_reply *reply = job->reply;
|
|
struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
|
|
int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
|
|
int ret;
|
|
|
|
/* check if we have the msgcode value at least */
|
|
if (job->request_len < sizeof(uint32_t)) {
|
|
ret = -ENOMSG;
|
|
goto fail_host_msg;
|
|
}
|
|
|
|
/* Validate the host command */
|
|
switch (req->msgcode) {
|
|
case ISCSI_BSG_HST_VENDOR:
|
|
cmdlen += sizeof(struct iscsi_bsg_host_vendor);
|
|
if ((shost->hostt->vendor_id == 0L) ||
|
|
(req->rqst_data.h_vendor.vendor_id !=
|
|
shost->hostt->vendor_id)) {
|
|
ret = -ESRCH;
|
|
goto fail_host_msg;
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EBADR;
|
|
goto fail_host_msg;
|
|
}
|
|
|
|
/* check if we really have all the request data needed */
|
|
if (job->request_len < cmdlen) {
|
|
ret = -ENOMSG;
|
|
goto fail_host_msg;
|
|
}
|
|
|
|
ret = i->iscsi_transport->bsg_request(job);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
fail_host_msg:
|
|
/* return the errno failure code as the only status */
|
|
BUG_ON(job->reply_len < sizeof(uint32_t));
|
|
reply->reply_payload_rcv_len = 0;
|
|
reply->result = ret;
|
|
job->reply_len = sizeof(uint32_t);
|
|
bsg_job_done(job, ret, 0);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
|
|
* @shost: shost for iscsi_host
|
|
* @ihost: iscsi_cls_host adding the structures to
|
|
*/
|
|
static int
|
|
iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
|
|
{
|
|
struct device *dev = &shost->shost_gendev;
|
|
struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
|
|
struct request_queue *q;
|
|
char bsg_name[20];
|
|
int ret;
|
|
|
|
if (!i->iscsi_transport->bsg_request)
|
|
return -ENOTSUPP;
|
|
|
|
snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
|
|
|
|
q = __scsi_alloc_queue(shost, bsg_request_fn);
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
|
|
if (ret) {
|
|
shost_printk(KERN_ERR, shost, "bsg interface failed to "
|
|
"initialize - no request queue\n");
|
|
blk_cleanup_queue(q);
|
|
return ret;
|
|
}
|
|
|
|
ihost->bsg_q = q;
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
iscsi_bsg_host_add(shost, ihost);
|
|
/* ignore any bsg add error - we just can't do sgio */
|
|
|
|
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;
|
|
|
|
if (ihost->bsg_q) {
|
|
bsg_remove_queue(ihost->bsg_q);
|
|
blk_cleanup_queue(ihost->bsg_q);
|
|
}
|
|
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_IMM_RETRY << 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);
|
|
|
|
int iscsi_is_session_online(struct iscsi_cls_session *session)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
if (session->state == ISCSI_SESSION_LOGGED_IN)
|
|
ret = 1;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_is_session_online);
|
|
|
|
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);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
|
|
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);
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
|
|
|
|
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);
|
|
goto user_scan_exit;
|
|
}
|
|
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);
|
|
}
|
|
|
|
user_scan_exit:
|
|
mutex_unlock(&ihost->mutex);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* iscsi_block_scsi_eh - block scsi eh until session state has transistioned
|
|
* @cmd: scsi cmd passed to scsi eh handler
|
|
*
|
|
* If the session is down this function will wait for the recovery
|
|
* timer to fire or for the session to be logged back in. If the
|
|
* recovery timer fires then FAST_IO_FAIL is returned. The caller
|
|
* should pass this error value to the scsi eh.
|
|
*/
|
|
int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
|
|
{
|
|
struct iscsi_cls_session *session =
|
|
starget_to_session(scsi_target(cmd->device));
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
while (session->state != ISCSI_SESSION_LOGGED_IN) {
|
|
if (session->state == ISCSI_SESSION_FREE) {
|
|
ret = FAST_IO_FAIL;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
msleep(1000);
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
|
|
|
|
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);
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
|
|
scsi_target_unblock(&session->dev);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
|
|
}
|
|
|
|
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;
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
|
|
/*
|
|
* 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 (scsi_queue_work(shost, &session->scan_work))
|
|
atomic_inc(&ihost->nr_scans);
|
|
}
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
session->state = ISCSI_SESSION_FAILED;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
scsi_target_block(&session->dev);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
|
|
if (session->recovery_tmo >= 0)
|
|
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;
|
|
unsigned int target_id;
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
|
|
|
|
/* 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;
|
|
}
|
|
|
|
target_id = session->target_id;
|
|
session->target_id = ISCSI_MAX_TARGET;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
mutex_unlock(&ihost->mutex);
|
|
|
|
if (session->ida_used)
|
|
ida_simple_remove(&iscsi_sess_ida, target_id);
|
|
|
|
scsi_remove_target(&session->dev);
|
|
iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
|
|
}
|
|
|
|
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->creator = -1;
|
|
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];
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
|
|
return session;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_alloc_session);
|
|
|
|
int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(session);
|
|
struct iscsi_cls_host *ihost;
|
|
unsigned long flags;
|
|
int id = 0;
|
|
int err;
|
|
|
|
ihost = shost->shost_data;
|
|
session->sid = atomic_add_return(1, &iscsi_session_nr);
|
|
|
|
if (target_id == ISCSI_MAX_TARGET) {
|
|
id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
|
|
|
|
if (id < 0) {
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"Failure in Target ID Allocation\n");
|
|
return id;
|
|
}
|
|
session->target_id = (unsigned int)id;
|
|
session->ida_used = true;
|
|
} else
|
|
session->target_id = target_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_ida;
|
|
}
|
|
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);
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
|
|
return 0;
|
|
|
|
release_ida:
|
|
if (session->ida_used)
|
|
ida_simple_remove(&iscsi_sess_ida, session->target_id);
|
|
|
|
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;
|
|
|
|
ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
|
|
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);
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
|
|
|
|
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 */
|
|
scsi_flush_work(shost);
|
|
__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);
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
|
|
device_del(&session->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_remove_session);
|
|
|
|
void iscsi_free_session(struct iscsi_cls_session *session)
|
|
{
|
|
ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
|
|
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_DBG_TRANS_SESSION(session, "Completing session destruction\n");
|
|
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];
|
|
|
|
mutex_init(&conn->ep_mutex);
|
|
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);
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
|
|
ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
|
|
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);
|
|
list_del(&conn->conn_list);
|
|
spin_unlock_irqrestore(&connlock, flags);
|
|
|
|
transport_unregister_device(&conn->dev);
|
|
ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
|
|
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_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
|
|
{
|
|
return nlmsg_multicast(nls, skb, 0, group, gfp);
|
|
}
|
|
|
|
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, 0, 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_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
|
|
|
|
int iscsi_offload_mesg(struct Scsi_Host *shost,
|
|
struct iscsi_transport *transport, uint32_t type,
|
|
char *data, uint16_t data_size)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
struct iscsi_uevent *ev;
|
|
int len = NLMSG_SPACE(sizeof(*ev) + data_size);
|
|
|
|
skb = alloc_skb(len, GFP_ATOMIC);
|
|
if (!skb) {
|
|
printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
|
|
ev = NLMSG_DATA(nlh);
|
|
memset(ev, 0, sizeof(*ev));
|
|
ev->type = type;
|
|
ev->transport_handle = iscsi_handle(transport);
|
|
switch (type) {
|
|
case ISCSI_KEVENT_PATH_REQ:
|
|
ev->r.req_path.host_no = shost->host_no;
|
|
break;
|
|
case ISCSI_KEVENT_IF_DOWN:
|
|
ev->r.notify_if_down.host_no = shost->host_no;
|
|
break;
|
|
}
|
|
|
|
memcpy((char *)ev + sizeof(*ev), data, data_size);
|
|
|
|
return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
|
|
|
|
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, 0, 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_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
|
|
|
|
iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
|
|
error);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
|
|
|
|
void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
|
|
enum iscsi_conn_state state)
|
|
{
|
|
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 login (%d)\n", state);
|
|
return;
|
|
}
|
|
|
|
nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
|
|
ev = NLMSG_DATA(nlh);
|
|
ev->transport_handle = iscsi_handle(conn->transport);
|
|
ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
|
|
ev->r.conn_login.state = state;
|
|
ev->r.conn_login.cid = conn->cid;
|
|
ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
|
|
iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
|
|
|
|
iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
|
|
state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
|
|
|
|
static int
|
|
iscsi_if_send_reply(uint32_t group, 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, 0, 0, t, (len - sizeof(*nlh)), 0);
|
|
nlh->nlmsg_flags = flags;
|
|
memcpy(NLMSG_DATA(nlh), payload, size);
|
|
return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
|
|
}
|
|
|
|
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, 0, 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_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
|
|
GFP_ATOMIC);
|
|
} 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, 0, 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_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
|
|
if (rc == -ESRCH)
|
|
iscsi_cls_session_printk(KERN_ERR, session,
|
|
"Cannot notify userspace of session "
|
|
"event %u. Check iscsi daemon\n",
|
|
event);
|
|
|
|
ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
|
|
event, rc);
|
|
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, pid_t pid,
|
|
uint32_t initial_cmdsn, uint16_t cmds_max,
|
|
uint16_t queue_depth)
|
|
{
|
|
struct iscsi_transport *transport = priv->iscsi_transport;
|
|
struct iscsi_cls_session *session;
|
|
struct Scsi_Host *shost;
|
|
|
|
session = transport->create_session(ep, cmds_max, queue_depth,
|
|
initial_cmdsn);
|
|
if (!session)
|
|
return -ENOMEM;
|
|
|
|
session->creator = pid;
|
|
shost = iscsi_session_to_shost(session);
|
|
ev->r.c_session_ret.host_no = shost->host_no;
|
|
ev->r.c_session_ret.sid = session->sid;
|
|
ISCSI_DBG_TRANS_SESSION(session,
|
|
"Completed creating transport session\n");
|
|
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;
|
|
|
|
ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
|
|
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;
|
|
|
|
ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
|
|
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);
|
|
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_ep_connect(struct iscsi_transport *transport,
|
|
struct iscsi_uevent *ev, int msg_type)
|
|
{
|
|
struct iscsi_endpoint *ep;
|
|
struct sockaddr *dst_addr;
|
|
struct Scsi_Host *shost = NULL;
|
|
int non_blocking, err = 0;
|
|
|
|
if (!transport->ep_connect)
|
|
return -EINVAL;
|
|
|
|
if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
|
|
shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
|
|
if (!shost) {
|
|
printk(KERN_ERR "ep connect failed. Could not find "
|
|
"host no %u\n",
|
|
ev->u.ep_connect_through_host.host_no);
|
|
return -ENODEV;
|
|
}
|
|
non_blocking = ev->u.ep_connect_through_host.non_blocking;
|
|
} else
|
|
non_blocking = ev->u.ep_connect.non_blocking;
|
|
|
|
dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
|
|
ep = transport->ep_connect(shost, dst_addr, non_blocking);
|
|
if (IS_ERR(ep)) {
|
|
err = PTR_ERR(ep);
|
|
goto release_host;
|
|
}
|
|
|
|
ev->r.ep_connect_ret.handle = ep->id;
|
|
release_host:
|
|
if (shost)
|
|
scsi_host_put(shost);
|
|
return err;
|
|
}
|
|
|
|
static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
|
|
u64 ep_handle)
|
|
{
|
|
struct iscsi_cls_conn *conn;
|
|
struct iscsi_endpoint *ep;
|
|
|
|
if (!transport->ep_disconnect)
|
|
return -EINVAL;
|
|
|
|
ep = iscsi_lookup_endpoint(ep_handle);
|
|
if (!ep)
|
|
return -EINVAL;
|
|
conn = ep->conn;
|
|
if (conn) {
|
|
mutex_lock(&conn->ep_mutex);
|
|
conn->ep = NULL;
|
|
mutex_unlock(&conn->ep_mutex);
|
|
}
|
|
|
|
transport->ep_disconnect(ep);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_if_transport_ep(struct iscsi_transport *transport,
|
|
struct iscsi_uevent *ev, int msg_type)
|
|
{
|
|
struct iscsi_endpoint *ep;
|
|
int rc = 0;
|
|
|
|
switch (msg_type) {
|
|
case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
|
|
case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
|
|
rc = iscsi_if_ep_connect(transport, ev, msg_type);
|
|
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:
|
|
rc = iscsi_if_ep_disconnect(transport,
|
|
ev->u.ep_disconnect.ep_handle);
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
iscsi_tgt_dscvr(struct iscsi_transport *transport,
|
|
struct iscsi_uevent *ev)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct sockaddr *dst_addr;
|
|
int err;
|
|
|
|
if (!transport->tgt_dscvr)
|
|
return -EINVAL;
|
|
|
|
shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
|
|
if (!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_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_path *params;
|
|
int err;
|
|
|
|
if (!transport->set_path)
|
|
return -ENOSYS;
|
|
|
|
shost = scsi_host_lookup(ev->u.set_path.host_no);
|
|
if (!shost) {
|
|
printk(KERN_ERR "set path could not find host no %u\n",
|
|
ev->u.set_path.host_no);
|
|
return -ENODEV;
|
|
}
|
|
|
|
params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
|
|
err = transport->set_path(shost, params);
|
|
|
|
scsi_host_put(shost);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
iscsi_set_iface_params(struct iscsi_transport *transport,
|
|
struct iscsi_uevent *ev, uint32_t len)
|
|
{
|
|
char *data = (char *)ev + sizeof(*ev);
|
|
struct Scsi_Host *shost;
|
|
int err;
|
|
|
|
if (!transport->set_iface_param)
|
|
return -ENOSYS;
|
|
|
|
shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
|
|
if (!shost) {
|
|
printk(KERN_ERR "set_iface_params could not find host no %u\n",
|
|
ev->u.set_iface_params.host_no);
|
|
return -ENODEV;
|
|
}
|
|
|
|
err = transport->set_iface_param(shost, data, len);
|
|
scsi_host_put(shost);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
|
|
{
|
|
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;
|
|
|
|
if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
|
|
*group = ISCSI_NL_GRP_UIP;
|
|
else
|
|
*group = ISCSI_NL_GRP_ISCSID;
|
|
|
|
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;
|
|
|
|
switch (nlh->nlmsg_type) {
|
|
case ISCSI_UEVENT_CREATE_SESSION:
|
|
err = iscsi_if_create_session(priv, ep, ev,
|
|
NETLINK_CREDS(skb)->pid,
|
|
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,
|
|
NETLINK_CREDS(skb)->pid,
|
|
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)
|
|
scsi_queue_work(iscsi_session_to_shost(session),
|
|
&session->unbind_work);
|
|
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 (conn && conn->ep)
|
|
iscsi_if_ep_disconnect(transport, conn->ep->id);
|
|
|
|
if (!session || !conn) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
ev->r.retcode = transport->bind_conn(session, conn,
|
|
ev->u.b_conn.transport_eph,
|
|
ev->u.b_conn.is_leading);
|
|
if (ev->r.retcode || !transport->ep_connect)
|
|
break;
|
|
|
|
ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
|
|
if (ep) {
|
|
ep->conn = conn;
|
|
|
|
mutex_lock(&conn->ep_mutex);
|
|
conn->ep = ep;
|
|
mutex_unlock(&conn->ep_mutex);
|
|
} else
|
|
iscsi_cls_conn_printk(KERN_ERR, conn,
|
|
"Could not set ep conn "
|
|
"binding\n");
|
|
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:
|
|
case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
|
|
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;
|
|
case ISCSI_UEVENT_PATH_UPDATE:
|
|
err = iscsi_set_path(transport, ev);
|
|
break;
|
|
case ISCSI_UEVENT_SET_IFACE_PARAMS:
|
|
err = iscsi_set_iface_params(transport, ev,
|
|
nlmsg_attrlen(nlh, sizeof(*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;
|
|
uint32_t group;
|
|
|
|
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, &group);
|
|
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(group, 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(exp_statsn, ISCSI_PARAM_EXP_STATSN);
|
|
iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
|
|
iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
|
|
iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
|
|
|
|
#define iscsi_conn_ep_attr_show(param) \
|
|
static ssize_t show_conn_ep_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; \
|
|
struct iscsi_endpoint *ep; \
|
|
ssize_t rc; \
|
|
\
|
|
/* \
|
|
* Need to make sure ep_disconnect does not free the LLD's \
|
|
* interconnect resources while we are trying to read them. \
|
|
*/ \
|
|
mutex_lock(&conn->ep_mutex); \
|
|
ep = conn->ep; \
|
|
if (!ep && t->ep_connect) { \
|
|
mutex_unlock(&conn->ep_mutex); \
|
|
return -ENOTCONN; \
|
|
} \
|
|
\
|
|
if (ep) \
|
|
rc = t->get_ep_param(ep, param, buf); \
|
|
else \
|
|
rc = t->get_conn_param(conn, param, buf); \
|
|
mutex_unlock(&conn->ep_mutex); \
|
|
return rc; \
|
|
}
|
|
|
|
#define iscsi_conn_ep_attr(field, param) \
|
|
iscsi_conn_ep_attr_show(param) \
|
|
static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
|
|
show_conn_ep_param_##param, NULL);
|
|
|
|
iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
|
|
iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
|
|
|
|
static struct attribute *iscsi_conn_attrs[] = {
|
|
&dev_attr_conn_max_recv_dlength.attr,
|
|
&dev_attr_conn_max_xmit_dlength.attr,
|
|
&dev_attr_conn_header_digest.attr,
|
|
&dev_attr_conn_data_digest.attr,
|
|
&dev_attr_conn_ifmarker.attr,
|
|
&dev_attr_conn_ofmarker.attr,
|
|
&dev_attr_conn_address.attr,
|
|
&dev_attr_conn_port.attr,
|
|
&dev_attr_conn_exp_statsn.attr,
|
|
&dev_attr_conn_persistent_address.attr,
|
|
&dev_attr_conn_persistent_port.attr,
|
|
&dev_attr_conn_ping_tmo.attr,
|
|
&dev_attr_conn_recv_tmo.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int i)
|
|
{
|
|
struct device *cdev = container_of(kobj, struct device, kobj);
|
|
struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
|
|
struct iscsi_transport *t = conn->transport;
|
|
int param;
|
|
|
|
if (attr == &dev_attr_conn_max_recv_dlength.attr)
|
|
param = ISCSI_PARAM_MAX_RECV_DLENGTH;
|
|
else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
|
|
param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
|
|
else if (attr == &dev_attr_conn_header_digest.attr)
|
|
param = ISCSI_PARAM_HDRDGST_EN;
|
|
else if (attr == &dev_attr_conn_data_digest.attr)
|
|
param = ISCSI_PARAM_DATADGST_EN;
|
|
else if (attr == &dev_attr_conn_ifmarker.attr)
|
|
param = ISCSI_PARAM_IFMARKER_EN;
|
|
else if (attr == &dev_attr_conn_ofmarker.attr)
|
|
param = ISCSI_PARAM_OFMARKER_EN;
|
|
else if (attr == &dev_attr_conn_address.attr)
|
|
param = ISCSI_PARAM_CONN_ADDRESS;
|
|
else if (attr == &dev_attr_conn_port.attr)
|
|
param = ISCSI_PARAM_CONN_PORT;
|
|
else if (attr == &dev_attr_conn_exp_statsn.attr)
|
|
param = ISCSI_PARAM_EXP_STATSN;
|
|
else if (attr == &dev_attr_conn_persistent_address.attr)
|
|
param = ISCSI_PARAM_PERSISTENT_ADDRESS;
|
|
else if (attr == &dev_attr_conn_persistent_port.attr)
|
|
param = ISCSI_PARAM_PERSISTENT_PORT;
|
|
else if (attr == &dev_attr_conn_ping_tmo.attr)
|
|
param = ISCSI_PARAM_PING_TMO;
|
|
else if (attr == &dev_attr_conn_recv_tmo.attr)
|
|
param = ISCSI_PARAM_RECV_TMO;
|
|
else {
|
|
WARN_ONCE(1, "Invalid conn attr");
|
|
return 0;
|
|
}
|
|
|
|
return t->attr_is_visible(ISCSI_PARAM, param);
|
|
}
|
|
|
|
static struct attribute_group iscsi_conn_group = {
|
|
.attrs = iscsi_conn_attrs,
|
|
.is_visible = iscsi_conn_attr_is_visible,
|
|
};
|
|
|
|
/*
|
|
* 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(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
|
|
iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
|
|
iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
|
|
iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 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);
|
|
static ssize_t
|
|
show_priv_session_creator(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
|
|
return sprintf(buf, "%d\n", session->creator);
|
|
}
|
|
static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
|
|
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); \
|
|
if (session->field == -1) \
|
|
return sprintf(buf, "off\n"); \
|
|
return sprintf(buf, format"\n", session->field); \
|
|
}
|
|
|
|
#define iscsi_priv_session_attr_store(field) \
|
|
static ssize_t \
|
|
store_priv_session_##field(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
const char *buf, size_t count) \
|
|
{ \
|
|
int val; \
|
|
char *cp; \
|
|
struct iscsi_cls_session *session = \
|
|
iscsi_dev_to_session(dev->parent); \
|
|
if ((session->state == ISCSI_SESSION_FREE) || \
|
|
(session->state == ISCSI_SESSION_FAILED)) \
|
|
return -EBUSY; \
|
|
if (strncmp(buf, "off", 3) == 0) \
|
|
session->field = -1; \
|
|
else { \
|
|
val = simple_strtoul(buf, &cp, 0); \
|
|
if (*cp != '\0' && *cp != '\n') \
|
|
return -EINVAL; \
|
|
session->field = val; \
|
|
} \
|
|
return count; \
|
|
}
|
|
|
|
#define iscsi_priv_session_rw_attr(field, format) \
|
|
iscsi_priv_session_attr_show(field, format) \
|
|
iscsi_priv_session_attr_store(field) \
|
|
static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
|
|
show_priv_session_##field, \
|
|
store_priv_session_##field)
|
|
iscsi_priv_session_rw_attr(recovery_tmo, "%d");
|
|
|
|
static struct attribute *iscsi_session_attrs[] = {
|
|
&dev_attr_sess_initial_r2t.attr,
|
|
&dev_attr_sess_max_outstanding_r2t.attr,
|
|
&dev_attr_sess_immediate_data.attr,
|
|
&dev_attr_sess_first_burst_len.attr,
|
|
&dev_attr_sess_max_burst_len.attr,
|
|
&dev_attr_sess_data_pdu_in_order.attr,
|
|
&dev_attr_sess_data_seq_in_order.attr,
|
|
&dev_attr_sess_erl.attr,
|
|
&dev_attr_sess_targetname.attr,
|
|
&dev_attr_sess_tpgt.attr,
|
|
&dev_attr_sess_password.attr,
|
|
&dev_attr_sess_password_in.attr,
|
|
&dev_attr_sess_username.attr,
|
|
&dev_attr_sess_username_in.attr,
|
|
&dev_attr_sess_fast_abort.attr,
|
|
&dev_attr_sess_abort_tmo.attr,
|
|
&dev_attr_sess_lu_reset_tmo.attr,
|
|
&dev_attr_sess_tgt_reset_tmo.attr,
|
|
&dev_attr_sess_ifacename.attr,
|
|
&dev_attr_sess_initiatorname.attr,
|
|
&dev_attr_sess_targetalias.attr,
|
|
&dev_attr_priv_sess_recovery_tmo.attr,
|
|
&dev_attr_priv_sess_state.attr,
|
|
&dev_attr_priv_sess_creator.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int i)
|
|
{
|
|
struct device *cdev = container_of(kobj, struct device, kobj);
|
|
struct iscsi_cls_session *session = transport_class_to_session(cdev);
|
|
struct iscsi_transport *t = session->transport;
|
|
int param;
|
|
|
|
if (attr == &dev_attr_sess_initial_r2t.attr)
|
|
param = ISCSI_PARAM_INITIAL_R2T_EN;
|
|
else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
|
|
param = ISCSI_PARAM_MAX_R2T;
|
|
else if (attr == &dev_attr_sess_immediate_data.attr)
|
|
param = ISCSI_PARAM_IMM_DATA_EN;
|
|
else if (attr == &dev_attr_sess_first_burst_len.attr)
|
|
param = ISCSI_PARAM_FIRST_BURST;
|
|
else if (attr == &dev_attr_sess_max_burst_len.attr)
|
|
param = ISCSI_PARAM_MAX_BURST;
|
|
else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
|
|
param = ISCSI_PARAM_PDU_INORDER_EN;
|
|
else if (attr == &dev_attr_sess_data_seq_in_order.attr)
|
|
param = ISCSI_PARAM_DATASEQ_INORDER_EN;
|
|
else if (attr == &dev_attr_sess_erl.attr)
|
|
param = ISCSI_PARAM_ERL;
|
|
else if (attr == &dev_attr_sess_targetname.attr)
|
|
param = ISCSI_PARAM_TARGET_NAME;
|
|
else if (attr == &dev_attr_sess_tpgt.attr)
|
|
param = ISCSI_PARAM_TPGT;
|
|
else if (attr == &dev_attr_sess_password.attr)
|
|
param = ISCSI_PARAM_USERNAME;
|
|
else if (attr == &dev_attr_sess_password_in.attr)
|
|
param = ISCSI_PARAM_USERNAME_IN;
|
|
else if (attr == &dev_attr_sess_username.attr)
|
|
param = ISCSI_PARAM_PASSWORD;
|
|
else if (attr == &dev_attr_sess_username_in.attr)
|
|
param = ISCSI_PARAM_PASSWORD_IN;
|
|
else if (attr == &dev_attr_sess_fast_abort.attr)
|
|
param = ISCSI_PARAM_FAST_ABORT;
|
|
else if (attr == &dev_attr_sess_abort_tmo.attr)
|
|
param = ISCSI_PARAM_ABORT_TMO;
|
|
else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
|
|
param = ISCSI_PARAM_LU_RESET_TMO;
|
|
else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
|
|
param = ISCSI_PARAM_TGT_RESET_TMO;
|
|
else if (attr == &dev_attr_sess_ifacename.attr)
|
|
param = ISCSI_PARAM_IFACE_NAME;
|
|
else if (attr == &dev_attr_sess_initiatorname.attr)
|
|
param = ISCSI_PARAM_INITIATOR_NAME;
|
|
else if (attr == &dev_attr_sess_targetalias.attr)
|
|
param = ISCSI_PARAM_TARGET_ALIAS;
|
|
else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
|
|
return S_IRUGO | S_IWUSR;
|
|
else if (attr == &dev_attr_priv_sess_state.attr)
|
|
return S_IRUGO;
|
|
else if (attr == &dev_attr_priv_sess_creator.attr)
|
|
return S_IRUGO;
|
|
else {
|
|
WARN_ONCE(1, "Invalid session attr");
|
|
return 0;
|
|
}
|
|
|
|
return t->attr_is_visible(ISCSI_PARAM, param);
|
|
}
|
|
|
|
static struct attribute_group iscsi_session_group = {
|
|
.attrs = iscsi_session_attrs,
|
|
.is_visible = iscsi_session_attr_is_visible,
|
|
};
|
|
|
|
/*
|
|
* 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);
|
|
|
|
static struct attribute *iscsi_host_attrs[] = {
|
|
&dev_attr_host_netdev.attr,
|
|
&dev_attr_host_hwaddress.attr,
|
|
&dev_attr_host_ipaddress.attr,
|
|
&dev_attr_host_initiatorname.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int i)
|
|
{
|
|
struct device *cdev = container_of(kobj, struct device, kobj);
|
|
struct Scsi_Host *shost = transport_class_to_shost(cdev);
|
|
struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
|
|
int param;
|
|
|
|
if (attr == &dev_attr_host_netdev.attr)
|
|
param = ISCSI_HOST_PARAM_NETDEV_NAME;
|
|
else if (attr == &dev_attr_host_hwaddress.attr)
|
|
param = ISCSI_HOST_PARAM_HWADDRESS;
|
|
else if (attr == &dev_attr_host_ipaddress.attr)
|
|
param = ISCSI_HOST_PARAM_IPADDRESS;
|
|
else if (attr == &dev_attr_host_initiatorname.attr)
|
|
param = ISCSI_HOST_PARAM_INITIATOR_NAME;
|
|
else {
|
|
WARN_ONCE(1, "Invalid host attr");
|
|
return 0;
|
|
}
|
|
|
|
return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
|
|
}
|
|
|
|
static struct attribute_group iscsi_host_group = {
|
|
.attrs = iscsi_host_attrs,
|
|
.is_visible = iscsi_host_attr_is_visible,
|
|
};
|
|
|
|
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 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->iscsi_transport = tt;
|
|
priv->t.user_scan = iscsi_user_scan;
|
|
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.class = &iscsi_host_class.class;
|
|
priv->t.host_attrs.ac.match = iscsi_host_match;
|
|
priv->t.host_attrs.ac.grp = &iscsi_host_group;
|
|
priv->t.host_size = sizeof(struct iscsi_cls_host);
|
|
transport_container_register(&priv->t.host_attrs);
|
|
|
|
/* connection parameters */
|
|
priv->conn_cont.ac.class = &iscsi_connection_class.class;
|
|
priv->conn_cont.ac.match = iscsi_conn_match;
|
|
priv->conn_cont.ac.grp = &iscsi_conn_group;
|
|
transport_container_register(&priv->conn_cont);
|
|
|
|
/* session parameters */
|
|
priv->session_cont.ac.class = &iscsi_session_class.class;
|
|
priv->session_cont.ac.match = iscsi_session_match;
|
|
priv->session_cont.ac.grp = &iscsi_session_group;
|
|
transport_container_register(&priv->session_cont);
|
|
|
|
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 = class_register(&iscsi_iface_class);
|
|
if (err)
|
|
goto unregister_endpoint_class;
|
|
|
|
err = transport_class_register(&iscsi_host_class);
|
|
if (err)
|
|
goto unregister_iface_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_iface_class:
|
|
class_unregister(&iscsi_iface_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_iface_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);
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
|