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OpenCloudOS-Kernel/drivers/scsi/scsi_transport_iscsi.c

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* iSCSI transport class definitions
*
* Copyright (C) IBM Corporation, 2004
* Copyright (C) Mike Christie, 2004
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_iscsi.h>
#define ISCSI_SESSION_ATTRS 20
#define ISCSI_HOST_ATTRS 2
struct iscsi_internal {
struct scsi_transport_template t;
struct iscsi_function_template *fnt;
/*
* We do not have any private or other attrs.
*/
struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
};
#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)
static DECLARE_TRANSPORT_CLASS(iscsi_transport_class,
"iscsi_transport",
NULL,
NULL,
NULL);
static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
"iscsi_host",
NULL,
NULL,
NULL);
/*
* iSCSI target and session attrs
*/
#define iscsi_session_show_fn(field, format) \
\
static ssize_t \
show_session_##field(struct class_device *cdev, char *buf) \
{ \
struct scsi_target *starget = transport_class_to_starget(cdev); \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
i->fnt->get_##field(starget); \
return snprintf(buf, 20, format"\n", iscsi_##field(starget)); \
}
#define iscsi_session_rd_attr(field, format) \
iscsi_session_show_fn(field, format) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL);
iscsi_session_rd_attr(tpgt, "%hu");
iscsi_session_rd_attr(tsih, "%2x");
iscsi_session_rd_attr(max_recv_data_segment_len, "%u");
iscsi_session_rd_attr(max_burst_len, "%u");
iscsi_session_rd_attr(first_burst_len, "%u");
iscsi_session_rd_attr(def_time2wait, "%hu");
iscsi_session_rd_attr(def_time2retain, "%hu");
iscsi_session_rd_attr(max_outstanding_r2t, "%hu");
iscsi_session_rd_attr(erl, "%d");
#define iscsi_session_show_bool_fn(field) \
\
static ssize_t \
show_session_bool_##field(struct class_device *cdev, char *buf) \
{ \
struct scsi_target *starget = transport_class_to_starget(cdev); \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
i->fnt->get_##field(starget); \
\
if (iscsi_##field(starget)) \
return sprintf(buf, "Yes\n"); \
return sprintf(buf, "No\n"); \
}
#define iscsi_session_rd_bool_attr(field) \
iscsi_session_show_bool_fn(field) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL);
iscsi_session_rd_bool_attr(initial_r2t);
iscsi_session_rd_bool_attr(immediate_data);
iscsi_session_rd_bool_attr(data_pdu_in_order);
iscsi_session_rd_bool_attr(data_sequence_in_order);
#define iscsi_session_show_digest_fn(field) \
\
static ssize_t \
show_##field(struct class_device *cdev, char *buf) \
{ \
struct scsi_target *starget = transport_class_to_starget(cdev); \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
i->fnt->get_##field(starget); \
\
if (iscsi_##field(starget)) \
return sprintf(buf, "CRC32C\n"); \
return sprintf(buf, "None\n"); \
}
#define iscsi_session_rd_digest_attr(field) \
iscsi_session_show_digest_fn(field) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
iscsi_session_rd_digest_attr(header_digest);
iscsi_session_rd_digest_attr(data_digest);
static ssize_t
show_port(struct class_device *cdev, char *buf)
{
struct scsi_target *starget = transport_class_to_starget(cdev);
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
if (i->fnt->get_port)
i->fnt->get_port(starget);
return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
}
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
static ssize_t
show_ip_address(struct class_device *cdev, char *buf)
{
struct scsi_target *starget = transport_class_to_starget(cdev);
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
if (i->fnt->get_ip_address)
i->fnt->get_ip_address(starget);
if (iscsi_addr_type(starget) == AF_INET)
return sprintf(buf, "%u.%u.%u.%u\n",
NIPQUAD(iscsi_sin_addr(starget)));
else if(iscsi_addr_type(starget) == AF_INET6)
return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
NIP6(iscsi_sin6_addr(starget)));
return -EINVAL;
}
static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);
static ssize_t
show_isid(struct class_device *cdev, char *buf)
{
struct scsi_target *starget = transport_class_to_starget(cdev);
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
if (i->fnt->get_isid)
i->fnt->get_isid(starget);
return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
iscsi_isid(starget)[0], iscsi_isid(starget)[1],
iscsi_isid(starget)[2], iscsi_isid(starget)[3],
iscsi_isid(starget)[4], iscsi_isid(starget)[5]);
}
static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);
/*
* This is used for iSCSI names. Normally, we follow
* the transport class convention of having the lld
* set the field, but in these cases the value is
* too large.
*/
#define iscsi_session_show_str_fn(field) \
\
static ssize_t \
show_session_str_##field(struct class_device *cdev, char *buf) \
{ \
ssize_t ret = 0; \
struct scsi_target *starget = transport_class_to_starget(cdev); \
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \
return ret; \
}
#define iscsi_session_rd_str_attr(field) \
iscsi_session_show_str_fn(field) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL);
iscsi_session_rd_str_attr(target_name);
iscsi_session_rd_str_attr(target_alias);
/*
* iSCSI host attrs
*/
/*
* Again, this is used for iSCSI names. Normally, we follow
* the transport class convention of having the lld set
* the field, but in these cases the value is too large.
*/
#define iscsi_host_show_str_fn(field) \
\
static ssize_t \
show_host_str_##field(struct class_device *cdev, char *buf) \
{ \
int ret = 0; \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \
struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
\
if (i->fnt->get_##field) \
ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \
return ret; \
}
#define iscsi_host_rd_str_attr(field) \
iscsi_host_show_str_fn(field) \
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL);
iscsi_host_rd_str_attr(initiator_name);
iscsi_host_rd_str_attr(initiator_alias);
#define SETUP_SESSION_RD_ATTR(field) \
if (i->fnt->show_##field) { \
i->session_attrs[count] = &class_device_attr_##field; \
count++; \
}
#define SETUP_HOST_RD_ATTR(field) \
if (i->fnt->show_##field) { \
i->host_attrs[count] = &class_device_attr_##field; \
count++; \
}
static int iscsi_host_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct iscsi_internal *i;
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;
i = to_iscsi_internal(shost->transportt);
return &i->t.host_attrs.ac == cont;
}
static int iscsi_target_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct iscsi_internal *i;
if (!scsi_is_target_device(dev))
return 0;
shost = dev_to_shost(dev->parent);
if (!shost->transportt || shost->transportt->host_attrs.ac.class
!= &iscsi_host_class.class)
return 0;
i = to_iscsi_internal(shost->transportt);
return &i->t.target_attrs.ac == cont;
}
struct scsi_transport_template *
iscsi_attach_transport(struct iscsi_function_template *fnt)
{
struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
GFP_KERNEL);
int count = 0;
if (unlikely(!i))
return NULL;
memset(i, 0, sizeof(struct iscsi_internal));
i->fnt = fnt;
i->t.target_attrs.ac.attrs = &i->session_attrs[0];
i->t.target_attrs.ac.class = &iscsi_transport_class.class;
i->t.target_attrs.ac.match = iscsi_target_match;
transport_container_register(&i->t.target_attrs);
i->t.target_size = sizeof(struct iscsi_class_session);
SETUP_SESSION_RD_ATTR(tsih);
SETUP_SESSION_RD_ATTR(isid);
SETUP_SESSION_RD_ATTR(header_digest);
SETUP_SESSION_RD_ATTR(data_digest);
SETUP_SESSION_RD_ATTR(target_name);
SETUP_SESSION_RD_ATTR(target_alias);
SETUP_SESSION_RD_ATTR(port);
SETUP_SESSION_RD_ATTR(tpgt);
SETUP_SESSION_RD_ATTR(ip_address);
SETUP_SESSION_RD_ATTR(initial_r2t);
SETUP_SESSION_RD_ATTR(immediate_data);
SETUP_SESSION_RD_ATTR(max_recv_data_segment_len);
SETUP_SESSION_RD_ATTR(max_burst_len);
SETUP_SESSION_RD_ATTR(first_burst_len);
SETUP_SESSION_RD_ATTR(def_time2wait);
SETUP_SESSION_RD_ATTR(def_time2retain);
SETUP_SESSION_RD_ATTR(max_outstanding_r2t);
SETUP_SESSION_RD_ATTR(data_pdu_in_order);
SETUP_SESSION_RD_ATTR(data_sequence_in_order);
SETUP_SESSION_RD_ATTR(erl);
BUG_ON(count > ISCSI_SESSION_ATTRS);
i->session_attrs[count] = NULL;
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &iscsi_host_class.class;
i->t.host_attrs.ac.match = iscsi_host_match;
transport_container_register(&i->t.host_attrs);
i->t.host_size = 0;
count = 0;
SETUP_HOST_RD_ATTR(initiator_name);
SETUP_HOST_RD_ATTR(initiator_alias);
BUG_ON(count > ISCSI_HOST_ATTRS);
i->host_attrs[count] = NULL;
return &i->t;
}
EXPORT_SYMBOL(iscsi_attach_transport);
void iscsi_release_transport(struct scsi_transport_template *t)
{
struct iscsi_internal *i = to_iscsi_internal(t);
transport_container_unregister(&i->t.target_attrs);
transport_container_unregister(&i->t.host_attrs);
kfree(i);
}
EXPORT_SYMBOL(iscsi_release_transport);
static __init int iscsi_transport_init(void)
{
int err = transport_class_register(&iscsi_transport_class);
if (err)
return err;
return transport_class_register(&iscsi_host_class);
}
static void __exit iscsi_transport_exit(void)
{
transport_class_unregister(&iscsi_host_class);
transport_class_unregister(&iscsi_transport_class);
}
module_init(iscsi_transport_init);
module_exit(iscsi_transport_exit);
MODULE_AUTHOR("Mike Christie");
MODULE_DESCRIPTION("iSCSI Transport Attributes");
MODULE_LICENSE("GPL");