mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 21:54:11 +08:00
[SCSI] add srp transport class
This adds srp transport class that works with ib_srp and ibmvscsi. It creates only /sys/class/{srp_host,srp_remote_ports} and srp_remote_ports has only "port_id" attribute. viola:/sys/class/srp_remote_ports/port-0:1# ls device port_id subsystem uevent viola:/sys/class/srp_remote_ports/port-0:1# cat port_id 4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00 Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
parent
604cd794de
commit
09345f6505
@ -289,6 +289,13 @@ config SCSI_SAS_ATTRS
|
||||
|
||||
source "drivers/scsi/libsas/Kconfig"
|
||||
|
||||
config SCSI_SRP_ATTRS
|
||||
tristate "SRP Transport Attributes"
|
||||
depends on SCSI
|
||||
help
|
||||
If you wish to export transport-specific information about
|
||||
each attached SRP device to sysfs, say Y.
|
||||
|
||||
endmenu
|
||||
|
||||
menuconfig SCSI_LOWLEVEL
|
||||
|
@ -34,6 +34,7 @@ obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o
|
||||
obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o
|
||||
obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
|
||||
obj-$(CONFIG_SCSI_SAS_LIBSAS) += libsas/
|
||||
obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
|
||||
|
||||
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o iscsi_tcp.o
|
||||
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
|
||||
|
320
drivers/scsi/scsi_transport_srp.c
Normal file
320
drivers/scsi/scsi_transport_srp.c
Normal file
@ -0,0 +1,320 @@
|
||||
/*
|
||||
* SCSI RDMA (SRP) transport class
|
||||
*
|
||||
* Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
|
||||
*
|
||||
* 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, version 2 of the
|
||||
* License.
|
||||
*
|
||||
* 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., 51 Franklin St, Fifth Floor, Boston, MA
|
||||
* 02110-1301 USA
|
||||
*/
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/jiffies.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/string.h>
|
||||
|
||||
#include <scsi/scsi.h>
|
||||
#include <scsi/scsi_device.h>
|
||||
#include <scsi/scsi_host.h>
|
||||
#include <scsi/scsi_transport.h>
|
||||
#include <scsi/scsi_transport_srp.h>
|
||||
|
||||
struct srp_host_attrs {
|
||||
atomic_t next_port_id;
|
||||
};
|
||||
#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
|
||||
|
||||
#define SRP_HOST_ATTRS 0
|
||||
#define SRP_RPORT_ATTRS 3
|
||||
|
||||
struct srp_internal {
|
||||
struct scsi_transport_template t;
|
||||
struct srp_function_template *f;
|
||||
|
||||
struct class_device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
|
||||
|
||||
struct class_device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
|
||||
struct class_device_attribute private_rport_attrs[SRP_RPORT_ATTRS];
|
||||
struct transport_container rport_attr_cont;
|
||||
};
|
||||
|
||||
#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
|
||||
|
||||
#define dev_to_rport(d) container_of(d, struct srp_rport, dev)
|
||||
#define transport_class_to_srp_rport(cdev) dev_to_rport((cdev)->dev)
|
||||
|
||||
static int srp_host_setup(struct transport_container *tc, struct device *dev,
|
||||
struct class_device *cdev)
|
||||
{
|
||||
struct Scsi_Host *shost = dev_to_shost(dev);
|
||||
struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
|
||||
|
||||
atomic_set(&srp_host->next_port_id, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
|
||||
NULL, NULL);
|
||||
|
||||
static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
|
||||
NULL, NULL, NULL);
|
||||
|
||||
#define SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm) \
|
||||
i->private_##attrb[count] = class_device_attr_##field; \
|
||||
i->private_##attrb[count].attr.mode = perm; \
|
||||
if (ro_test) { \
|
||||
i->private_##attrb[count].attr.mode = ro_perm; \
|
||||
i->private_##attrb[count].store = NULL; \
|
||||
} \
|
||||
i->attrb[count] = &i->private_##attrb[count]; \
|
||||
if (test) \
|
||||
count++
|
||||
|
||||
#define SETUP_RPORT_ATTRIBUTE_RD(field) \
|
||||
SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0)
|
||||
|
||||
#define SETUP_RPORT_ATTRIBUTE_RW(field) \
|
||||
SETUP_TEMPLATE(rport_attrs, field, S_IRUGO | S_IWUSR, \
|
||||
1, 1, S_IRUGO)
|
||||
|
||||
#define SRP_PID(p) \
|
||||
(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
|
||||
(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
|
||||
(p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \
|
||||
(p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15]
|
||||
|
||||
#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
|
||||
"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
|
||||
|
||||
static ssize_t
|
||||
show_srp_rport_id(struct class_device *cdev, char *buf)
|
||||
{
|
||||
struct srp_rport *rport = transport_class_to_srp_rport(cdev);
|
||||
return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
|
||||
}
|
||||
|
||||
static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
|
||||
|
||||
static void srp_rport_release(struct device *dev)
|
||||
{
|
||||
struct srp_rport *rport = dev_to_rport(dev);
|
||||
|
||||
put_device(dev->parent);
|
||||
kfree(rport);
|
||||
}
|
||||
|
||||
static int scsi_is_srp_rport(const struct device *dev)
|
||||
{
|
||||
return dev->release == srp_rport_release;
|
||||
}
|
||||
|
||||
static int srp_rport_match(struct attribute_container *cont,
|
||||
struct device *dev)
|
||||
{
|
||||
struct Scsi_Host *shost;
|
||||
struct srp_internal *i;
|
||||
|
||||
if (!scsi_is_srp_rport(dev))
|
||||
return 0;
|
||||
|
||||
shost = dev_to_shost(dev->parent);
|
||||
if (!shost->transportt)
|
||||
return 0;
|
||||
if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
|
||||
return 0;
|
||||
|
||||
i = to_srp_internal(shost->transportt);
|
||||
return &i->rport_attr_cont.ac == cont;
|
||||
}
|
||||
|
||||
static int srp_host_match(struct attribute_container *cont, struct device *dev)
|
||||
{
|
||||
struct Scsi_Host *shost;
|
||||
struct srp_internal *i;
|
||||
|
||||
if (!scsi_is_host_device(dev))
|
||||
return 0;
|
||||
|
||||
shost = dev_to_shost(dev);
|
||||
if (!shost->transportt)
|
||||
return 0;
|
||||
if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
|
||||
return 0;
|
||||
|
||||
i = to_srp_internal(shost->transportt);
|
||||
return &i->t.host_attrs.ac == cont;
|
||||
}
|
||||
|
||||
/**
|
||||
* srp_rport_add - add a SRP remote port to the device hierarchy
|
||||
*
|
||||
* @shost: scsi host the remote port is connected to.
|
||||
* @ids: The port id for the remote port.
|
||||
*
|
||||
* publishes a port to the rest of the system
|
||||
*/
|
||||
struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
|
||||
struct srp_rport_identifiers *ids)
|
||||
{
|
||||
struct srp_rport *rport;
|
||||
struct device *parent = &shost->shost_gendev;
|
||||
int id, ret;
|
||||
|
||||
rport = kzalloc(sizeof(*rport), GFP_KERNEL);
|
||||
if (!rport)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
device_initialize(&rport->dev);
|
||||
|
||||
rport->dev.parent = get_device(parent);
|
||||
rport->dev.release = srp_rport_release;
|
||||
|
||||
memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
|
||||
|
||||
id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
|
||||
sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id);
|
||||
|
||||
transport_setup_device(&rport->dev);
|
||||
|
||||
ret = device_add(&rport->dev);
|
||||
if (ret) {
|
||||
transport_destroy_device(&rport->dev);
|
||||
put_device(&rport->dev);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
transport_add_device(&rport->dev);
|
||||
transport_configure_device(&rport->dev);
|
||||
|
||||
return rport;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(srp_rport_add);
|
||||
|
||||
/**
|
||||
* srp_rport_del -- remove a SRP remote port
|
||||
* @port: SRP remote port to remove
|
||||
*
|
||||
* Removes the specified SRP remote port.
|
||||
*/
|
||||
void srp_rport_del(struct srp_rport *rport)
|
||||
{
|
||||
struct device *dev = &rport->dev;
|
||||
|
||||
transport_remove_device(dev);
|
||||
device_del(dev);
|
||||
transport_destroy_device(dev);
|
||||
put_device(dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(srp_rport_del);
|
||||
|
||||
static int do_srp_rport_del(struct device *dev, void *data)
|
||||
{
|
||||
srp_rport_del(dev_to_rport(dev));
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* srp_remove_host -- tear down a Scsi_Host's SRP data structures
|
||||
* @shost: Scsi Host that is torn down
|
||||
*
|
||||
* Removes all SRP remote ports for a given Scsi_Host.
|
||||
* Must be called just before scsi_remove_host for SRP HBAs.
|
||||
*/
|
||||
void srp_remove_host(struct Scsi_Host *shost)
|
||||
{
|
||||
device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(srp_remove_host);
|
||||
|
||||
/**
|
||||
* srp_attach_transport -- instantiate SRP transport template
|
||||
* @ft: SRP transport class function template
|
||||
*/
|
||||
struct scsi_transport_template *
|
||||
srp_attach_transport(struct srp_function_template *ft)
|
||||
{
|
||||
int count;
|
||||
struct srp_internal *i;
|
||||
|
||||
i = kzalloc(sizeof(*i), GFP_KERNEL);
|
||||
if (!i)
|
||||
return NULL;
|
||||
|
||||
i->t.host_size = sizeof(struct srp_host_attrs);
|
||||
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
|
||||
i->t.host_attrs.ac.class = &srp_host_class.class;
|
||||
i->t.host_attrs.ac.match = srp_host_match;
|
||||
i->host_attrs[0] = NULL;
|
||||
transport_container_register(&i->t.host_attrs);
|
||||
|
||||
i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
|
||||
i->rport_attr_cont.ac.class = &srp_rport_class.class;
|
||||
i->rport_attr_cont.ac.match = srp_rport_match;
|
||||
transport_container_register(&i->rport_attr_cont);
|
||||
|
||||
count = 0;
|
||||
SETUP_RPORT_ATTRIBUTE_RD(port_id);
|
||||
i->rport_attrs[count] = NULL;
|
||||
|
||||
i->f = ft;
|
||||
|
||||
return &i->t;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(srp_attach_transport);
|
||||
|
||||
/**
|
||||
* srp_release_transport -- release SRP transport template instance
|
||||
* @t: transport template instance
|
||||
*/
|
||||
void srp_release_transport(struct scsi_transport_template *t)
|
||||
{
|
||||
struct srp_internal *i = to_srp_internal(t);
|
||||
|
||||
transport_container_unregister(&i->t.host_attrs);
|
||||
transport_container_unregister(&i->rport_attr_cont);
|
||||
|
||||
kfree(i);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(srp_release_transport);
|
||||
|
||||
static __init int srp_transport_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = transport_class_register(&srp_host_class);
|
||||
if (ret)
|
||||
return ret;
|
||||
ret = transport_class_register(&srp_rport_class);
|
||||
if (ret)
|
||||
goto unregister_host_class;
|
||||
|
||||
return 0;
|
||||
unregister_host_class:
|
||||
transport_class_unregister(&srp_host_class);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit srp_transport_exit(void)
|
||||
{
|
||||
transport_class_unregister(&srp_host_class);
|
||||
transport_class_unregister(&srp_rport_class);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("FUJITA Tomonori");
|
||||
MODULE_DESCRIPTION("SRP Transport Attributes");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(srp_transport_init);
|
||||
module_exit(srp_transport_exit);
|
32
include/scsi/scsi_transport_srp.h
Normal file
32
include/scsi/scsi_transport_srp.h
Normal file
@ -0,0 +1,32 @@
|
||||
#ifndef SCSI_TRANSPORT_SRP_H
|
||||
#define SCSI_TRANSPORT_SRP_H
|
||||
|
||||
#include <linux/transport_class.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
struct srp_rport_identifiers {
|
||||
u8 port_id[16];
|
||||
};
|
||||
|
||||
struct srp_rport {
|
||||
struct device dev;
|
||||
|
||||
u8 port_id[16];
|
||||
};
|
||||
|
||||
struct srp_function_template {
|
||||
/* later */
|
||||
};
|
||||
|
||||
extern struct scsi_transport_template *
|
||||
srp_attach_transport(struct srp_function_template *);
|
||||
extern void srp_release_transport(struct scsi_transport_template *);
|
||||
|
||||
extern struct srp_rport *srp_rport_add(struct Scsi_Host *,
|
||||
struct srp_rport_identifiers *);
|
||||
extern void srp_rport_del(struct srp_rport *);
|
||||
|
||||
extern void srp_remove_host(struct Scsi_Host *);
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user