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linux/drivers/scsi/scsi_transport_fc.c
James.Smart@Emulex.Com 5c44cd2afa [SCSI] fix target scanning oops with fc transport class 
We have some nasty issues with 2.6.12-rc6. Any request to scan on
the lpfc or qla2xxx FC adapters will oops. What is happening is the
system is defaulting to non-transport registered targets, which
inherit the parent of the scan. On this second scan, performed by
the attribute, the parent becomes the shost instead of the rport.
The slave functions in the 2 FC adapters use starget_to_rport()
routines, which incorrectly map the shost as an rport pointer.

Additionally, this pointed out other weaknesses:
- If the target structure is torn down outside of the transport,
  we have no method for it to be regenerated at the proper parent.
- We have race conditions on the target being allocated by both
  the midlayer scan (parent=shost) and by the fc transport
  (parent=rport).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-08-08 17:14:55 -05:00

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/*
* FiberChannel transport specific attributes exported to sysfs.
*
* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
*
* 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
*
* ========
*
* Copyright (C) 2004-2005 James Smart, Emulex Corporation
* Rewrite for host, target, device, and remote port attributes,
* statistics, and service functions...
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include "scsi_priv.h"
#define FC_PRINTK(x, l, f, a...) printk(l "scsi(%d:%d:%d:%d): " f, (x)->host->host_no, (x)->channel, (x)->id, (x)->lun , ##a)
/*
* Redefine so that we can have same named attributes in the
* sdev/starget/host objects.
*/
#define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
struct class_device_attribute class_device_attr_##_prefix##_##_name = \
__ATTR(_name,_mode,_show,_store)
#define fc_enum_name_search(title, table_type, table) \
static const char *get_fc_##title##_name(enum table_type table_key) \
{ \
int i; \
char *name = NULL; \
\
for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
if (table[i].value == table_key) { \
name = table[i].name; \
break; \
} \
} \
return name; \
}
#define fc_enum_name_match(title, table_type, table) \
static int get_fc_##title##_match(const char *table_key, \
enum table_type *value) \
{ \
int i; \
\
for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
if (strncmp(table_key, table[i].name, \
table[i].matchlen) == 0) { \
*value = table[i].value; \
return 0; /* success */ \
} \
} \
return 1; /* failure */ \
}
/* Convert fc_port_type values to ascii string name */
static struct {
enum fc_port_type value;
char *name;
} fc_port_type_names[] = {
{ FC_PORTTYPE_UNKNOWN, "Unknown" },
{ FC_PORTTYPE_OTHER, "Other" },
{ FC_PORTTYPE_NOTPRESENT, "Not Present" },
{ FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
{ FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
{ FC_PORTTYPE_LPORT, "LPort (private loop)" },
{ FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN 50
/* Convert fc_port_state values to ascii string name */
static struct {
enum fc_port_state value;
char *name;
} fc_port_state_names[] = {
{ FC_PORTSTATE_UNKNOWN, "Unknown" },
{ FC_PORTSTATE_NOTPRESENT, "Not Present" },
{ FC_PORTSTATE_ONLINE, "Online" },
{ FC_PORTSTATE_OFFLINE, "Offline" },
{ FC_PORTSTATE_BLOCKED, "Blocked" },
{ FC_PORTSTATE_BYPASSED, "Bypassed" },
{ FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
{ FC_PORTSTATE_LINKDOWN, "Linkdown" },
{ FC_PORTSTATE_ERROR, "Error" },
{ FC_PORTSTATE_LOOPBACK, "Loopback" },
};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN 20
/* Convert fc_tgtid_binding_type values to ascii string name */
static struct {
enum fc_tgtid_binding_type value;
char *name;
int matchlen;
} fc_tgtid_binding_type_names[] = {
{ FC_TGTID_BIND_NONE, "none", 4 },
{ FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
{ FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
{ FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
};
fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
fc_tgtid_binding_type_names)
fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
fc_tgtid_binding_type_names)
#define FC_BINDTYPE_MAX_NAMELEN 30
#define fc_bitfield_name_search(title, table) \
static ssize_t \
get_fc_##title##_names(u32 table_key, char *buf) \
{ \
char *prefix = ""; \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
if (table[i].value & table_key) { \
len += sprintf(buf + len, "%s%s", \
prefix, table[i].name); \
prefix = ", "; \
} \
} \
len += sprintf(buf + len, "\n"); \
return len; \
}
/* Convert FC_COS bit values to ascii string name */
static struct {
u32 value;
char *name;
} fc_cos_names[] = {
{ FC_COS_CLASS1, "Class 1" },
{ FC_COS_CLASS2, "Class 2" },
{ FC_COS_CLASS3, "Class 3" },
{ FC_COS_CLASS4, "Class 4" },
{ FC_COS_CLASS6, "Class 6" },
};
fc_bitfield_name_search(cos, fc_cos_names)
/* Convert FC_PORTSPEED bit values to ascii string name */
static struct {
u32 value;
char *name;
} fc_port_speed_names[] = {
{ FC_PORTSPEED_1GBIT, "1 Gbit" },
{ FC_PORTSPEED_2GBIT, "2 Gbit" },
{ FC_PORTSPEED_4GBIT, "4 Gbit" },
{ FC_PORTSPEED_10GBIT, "10 Gbit" },
{ FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
};
fc_bitfield_name_search(port_speed, fc_port_speed_names)
static int
show_fc_fc4s (char *buf, u8 *fc4_list)
{
int i, len=0;
for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
len += sprintf(buf + len , "0x%02x ", *fc4_list);
len += sprintf(buf + len, "\n");
return len;
}
/* Convert FC_RPORT_ROLE bit values to ascii string name */
static struct {
u32 value;
char *name;
} fc_remote_port_role_names[] = {
{ FC_RPORT_ROLE_FCP_TARGET, "FCP Target" },
{ FC_RPORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
{ FC_RPORT_ROLE_IP_PORT, "IP Port" },
};
fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
/*
* Define roles that are specific to port_id. Values are relative to ROLE_MASK.
*/
#define FC_WELLKNOWN_PORTID_MASK 0xfffff0
#define FC_WELLKNOWN_ROLE_MASK 0x00000f
#define FC_FPORT_PORTID 0x00000e
#define FC_FABCTLR_PORTID 0x00000d
#define FC_DIRSRVR_PORTID 0x00000c
#define FC_TIMESRVR_PORTID 0x00000b
#define FC_MGMTSRVR_PORTID 0x00000a
static void fc_timeout_blocked_rport(void *data);
static void fc_scsi_scan_rport(void *data);
static void fc_rport_terminate(struct fc_rport *rport);
/*
* Attribute counts pre object type...
* Increase these values if you add attributes
*/
#define FC_STARGET_NUM_ATTRS 3
#define FC_RPORT_NUM_ATTRS 9
#define FC_HOST_NUM_ATTRS 15
struct fc_internal {
struct scsi_transport_template t;
struct fc_function_template *f;
/*
* For attributes : each object has :
* An array of the actual attributes structures
* An array of null-terminated pointers to the attribute
* structures - used for mid-layer interaction.
*
* The attribute containers for the starget and host are are
* part of the midlayer. As the remote port is specific to the
* fc transport, we must provide the attribute container.
*/
struct class_device_attribute private_starget_attrs[
FC_STARGET_NUM_ATTRS];
struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
struct transport_container rport_attr_cont;
struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
};
#define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
static int fc_target_setup(struct device *dev)
{
struct scsi_target *starget = to_scsi_target(dev);
struct fc_rport *rport = starget_to_rport(starget);
/*
* if parent is remote port, use values from remote port.
* Otherwise, this host uses the fc_transport, but not the
* remote port interface. As such, initialize to known non-values.
*/
if (rport) {
fc_starget_node_name(starget) = rport->node_name;
fc_starget_port_name(starget) = rport->port_name;
fc_starget_port_id(starget) = rport->port_id;
} else {
fc_starget_node_name(starget) = -1;
fc_starget_port_name(starget) = -1;
fc_starget_port_id(starget) = -1;
}
return 0;
}
static DECLARE_TRANSPORT_CLASS(fc_transport_class,
"fc_transport",
fc_target_setup,
NULL,
NULL);
static int fc_host_setup(struct device *dev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
/*
* Set default values easily detected by the midlayer as
* failure cases. The scsi lldd is responsible for initializing
* all transport attributes to valid values per host.
*/
fc_host_node_name(shost) = -1;
fc_host_port_name(shost) = -1;
fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
memset(fc_host_supported_fc4s(shost), 0,
sizeof(fc_host_supported_fc4s(shost)));
memset(fc_host_symbolic_name(shost), 0,
sizeof(fc_host_symbolic_name(shost)));
fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
fc_host_maxframe_size(shost) = -1;
memset(fc_host_serial_number(shost), 0,
sizeof(fc_host_serial_number(shost)));
fc_host_port_id(shost) = -1;
fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
memset(fc_host_active_fc4s(shost), 0,
sizeof(fc_host_active_fc4s(shost)));
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
fc_host_fabric_name(shost) = -1;
fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
INIT_LIST_HEAD(&fc_host_rports(shost));
INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
fc_host_next_rport_number(shost) = 0;
fc_host_next_target_id(shost) = 0;
return 0;
}
static DECLARE_TRANSPORT_CLASS(fc_host_class,
"fc_host",
fc_host_setup,
NULL,
NULL);
/*
* Setup and Remove actions for remote ports are handled
* in the service functions below.
*/
static DECLARE_TRANSPORT_CLASS(fc_rport_class,
"fc_remote_ports",
NULL,
NULL,
NULL);
/*
* Module Parameters
*/
/*
* dev_loss_tmo: the default number of seconds that the FC transport
* should insulate the loss of a remote port.
* The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
*/
static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
"Maximum number of seconds that the FC transport should"
" insulate the loss of a remote port. Once this value is"
" exceeded, the scsi target is removed. Value should be"
" between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
static __init int fc_transport_init(void)
{
int error = transport_class_register(&fc_host_class);
if (error)
return error;
error = transport_class_register(&fc_rport_class);
if (error)
return error;
return transport_class_register(&fc_transport_class);
}
static void __exit fc_transport_exit(void)
{
transport_class_unregister(&fc_transport_class);
transport_class_unregister(&fc_rport_class);
transport_class_unregister(&fc_host_class);
}
/*
* FC Remote Port Attribute Management
*/
#define fc_rport_show_function(field, format_string, sz, cast) \
static ssize_t \
show_fc_rport_##field (struct class_device *cdev, char *buf) \
{ \
struct fc_rport *rport = transport_class_to_rport(cdev); \
struct Scsi_Host *shost = rport_to_shost(rport); \
struct fc_internal *i = to_fc_internal(shost->transportt); \
if (i->f->get_rport_##field) \
i->f->get_rport_##field(rport); \
return snprintf(buf, sz, format_string, cast rport->field); \
}
#define fc_rport_store_function(field) \
static ssize_t \
store_fc_rport_##field(struct class_device *cdev, const char *buf, \
size_t count) \
{ \
int val; \
struct fc_rport *rport = transport_class_to_rport(cdev); \
struct Scsi_Host *shost = rport_to_shost(rport); \
struct fc_internal *i = to_fc_internal(shost->transportt); \
val = simple_strtoul(buf, NULL, 0); \
i->f->set_rport_##field(rport, val); \
return count; \
}
#define fc_rport_rd_attr(field, format_string, sz) \
fc_rport_show_function(field, format_string, sz, ) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
show_fc_rport_##field, NULL)
#define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
fc_rport_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
show_fc_rport_##field, NULL)
#define fc_rport_rw_attr(field, format_string, sz) \
fc_rport_show_function(field, format_string, sz, ) \
fc_rport_store_function(field) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
show_fc_rport_##field, \
store_fc_rport_##field)
#define fc_private_rport_show_function(field, format_string, sz, cast) \
static ssize_t \
show_fc_rport_##field (struct class_device *cdev, char *buf) \
{ \
struct fc_rport *rport = transport_class_to_rport(cdev); \
return snprintf(buf, sz, format_string, cast rport->field); \
}
#define fc_private_rport_rd_attr(field, format_string, sz) \
fc_private_rport_show_function(field, format_string, sz, ) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
show_fc_rport_##field, NULL)
#define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
fc_private_rport_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
show_fc_rport_##field, NULL)
#define fc_private_rport_rd_enum_attr(title, maxlen) \
static ssize_t \
show_fc_rport_##title (struct class_device *cdev, char *buf) \
{ \
struct fc_rport *rport = transport_class_to_rport(cdev); \
const char *name; \
name = get_fc_##title##_name(rport->title); \
if (!name) \
return -EINVAL; \
return snprintf(buf, maxlen, "%s\n", name); \
} \
static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO, \
show_fc_rport_##title, NULL)
#define SETUP_RPORT_ATTRIBUTE_RD(field) \
i->private_rport_attrs[count] = class_device_attr_rport_##field; \
i->private_rport_attrs[count].attr.mode = S_IRUGO; \
i->private_rport_attrs[count].store = NULL; \
i->rport_attrs[count] = &i->private_rport_attrs[count]; \
if (i->f->show_rport_##field) \
count++
#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
i->private_rport_attrs[count] = class_device_attr_rport_##field; \
i->private_rport_attrs[count].attr.mode = S_IRUGO; \
i->private_rport_attrs[count].store = NULL; \
i->rport_attrs[count] = &i->private_rport_attrs[count]; \
count++
#define SETUP_RPORT_ATTRIBUTE_RW(field) \
i->private_rport_attrs[count] = class_device_attr_rport_##field; \
if (!i->f->set_rport_##field) { \
i->private_rport_attrs[count].attr.mode = S_IRUGO; \
i->private_rport_attrs[count].store = NULL; \
} \
i->rport_attrs[count] = &i->private_rport_attrs[count]; \
if (i->f->show_rport_##field) \
count++
/* The FC Transport Remote Port Attributes: */
/* Fixed Remote Port Attributes */
fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
static ssize_t
show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
{
struct fc_rport *rport = transport_class_to_rport(cdev);
if (rport->supported_classes == FC_COS_UNSPECIFIED)
return snprintf(buf, 20, "unspecified\n");
return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
show_fc_rport_supported_classes, NULL);
/* Dynamic Remote Port Attributes */
fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20);
/* Private Remote Port Attributes */
fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
static ssize_t
show_fc_rport_roles (struct class_device *cdev, char *buf)
{
struct fc_rport *rport = transport_class_to_rport(cdev);
/* identify any roles that are port_id specific */
if ((rport->port_id != -1) &&
(rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
FC_WELLKNOWN_PORTID_MASK) {
switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
case FC_FPORT_PORTID:
return snprintf(buf, 30, "Fabric Port\n");
case FC_FABCTLR_PORTID:
return snprintf(buf, 30, "Fabric Controller\n");
case FC_DIRSRVR_PORTID:
return snprintf(buf, 30, "Directory Server\n");
case FC_TIMESRVR_PORTID:
return snprintf(buf, 30, "Time Server\n");
case FC_MGMTSRVR_PORTID:
return snprintf(buf, 30, "Management Server\n");
default:
return snprintf(buf, 30, "Unknown Fabric Entity\n");
}
} else {
if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
return snprintf(buf, 20, "unknown\n");
return get_fc_remote_port_roles_names(rport->roles, buf);
}
}
static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
show_fc_rport_roles, NULL);
fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
/*
* FC SCSI Target Attribute Management
*/
/*
* Note: in the target show function we recognize when the remote
* port is in the heirarchy and do not allow the driver to get
* involved in sysfs functions. The driver only gets involved if
* it's the "old" style that doesn't use rports.
*/
#define fc_starget_show_function(field, format_string, sz, cast) \
static ssize_t \
show_fc_starget_##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 fc_internal *i = to_fc_internal(shost->transportt); \
struct fc_rport *rport = starget_to_rport(starget); \
if (rport) \
fc_starget_##field(starget) = rport->field; \
else if (i->f->get_starget_##field) \
i->f->get_starget_##field(starget); \
return snprintf(buf, sz, format_string, \
cast fc_starget_##field(starget)); \
}
#define fc_starget_rd_attr(field, format_string, sz) \
fc_starget_show_function(field, format_string, sz, ) \
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO, \
show_fc_starget_##field, NULL)
#define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
fc_starget_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO, \
show_fc_starget_##field, NULL)
#define SETUP_STARGET_ATTRIBUTE_RD(field) \
i->private_starget_attrs[count] = class_device_attr_starget_##field; \
i->private_starget_attrs[count].attr.mode = S_IRUGO; \
i->private_starget_attrs[count].store = NULL; \
i->starget_attrs[count] = &i->private_starget_attrs[count]; \
if (i->f->show_starget_##field) \
count++
#define SETUP_STARGET_ATTRIBUTE_RW(field) \
i->private_starget_attrs[count] = class_device_attr_starget_##field; \
if (!i->f->set_starget_##field) { \
i->private_starget_attrs[count].attr.mode = S_IRUGO; \
i->private_starget_attrs[count].store = NULL; \
} \
i->starget_attrs[count] = &i->private_starget_attrs[count]; \
if (i->f->show_starget_##field) \
count++
/* The FC Transport SCSI Target Attributes: */
fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr(port_id, "0x%06x\n", 20);
/*
* Host Attribute Management
*/
#define fc_host_show_function(field, format_string, sz, cast) \
static ssize_t \
show_fc_host_##field (struct class_device *cdev, char *buf) \
{ \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \
struct fc_internal *i = to_fc_internal(shost->transportt); \
if (i->f->get_host_##field) \
i->f->get_host_##field(shost); \
return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}
#define fc_host_store_function(field) \
static ssize_t \
store_fc_host_##field(struct class_device *cdev, const char *buf, \
size_t count) \
{ \
int val; \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \
struct fc_internal *i = to_fc_internal(shost->transportt); \
\
val = simple_strtoul(buf, NULL, 0); \
i->f->set_host_##field(shost, val); \
return count; \
}
#define fc_host_rd_attr(field, format_string, sz) \
fc_host_show_function(field, format_string, sz, ) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
show_fc_host_##field, NULL)
#define fc_host_rd_attr_cast(field, format_string, sz, cast) \
fc_host_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
show_fc_host_##field, NULL)
#define fc_host_rw_attr(field, format_string, sz) \
fc_host_show_function(field, format_string, sz, ) \
fc_host_store_function(field) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
show_fc_host_##field, \
store_fc_host_##field)
#define fc_host_rd_enum_attr(title, maxlen) \
static ssize_t \
show_fc_host_##title (struct class_device *cdev, char *buf) \
{ \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \
struct fc_internal *i = to_fc_internal(shost->transportt); \
const char *name; \
if (i->f->get_host_##title) \
i->f->get_host_##title(shost); \
name = get_fc_##title##_name(fc_host_##title(shost)); \
if (!name) \
return -EINVAL; \
return snprintf(buf, maxlen, "%s\n", name); \
} \
static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
#define SETUP_HOST_ATTRIBUTE_RD(field) \
i->private_host_attrs[count] = class_device_attr_host_##field; \
i->private_host_attrs[count].attr.mode = S_IRUGO; \
i->private_host_attrs[count].store = NULL; \
i->host_attrs[count] = &i->private_host_attrs[count]; \
if (i->f->show_host_##field) \
count++
#define SETUP_HOST_ATTRIBUTE_RW(field) \
i->private_host_attrs[count] = class_device_attr_host_##field; \
if (!i->f->set_host_##field) { \
i->private_host_attrs[count].attr.mode = S_IRUGO; \
i->private_host_attrs[count].store = NULL; \
} \
i->host_attrs[count] = &i->private_host_attrs[count]; \
if (i->f->show_host_##field) \
count++
#define fc_private_host_show_function(field, format_string, sz, cast) \
static ssize_t \
show_fc_host_##field (struct class_device *cdev, char *buf) \
{ \
struct Scsi_Host *shost = transport_class_to_shost(cdev); \
return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}
#define fc_private_host_rd_attr(field, format_string, sz) \
fc_private_host_show_function(field, format_string, sz, ) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
show_fc_host_##field, NULL)
#define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
fc_private_host_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
show_fc_host_##field, NULL)
#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
i->private_host_attrs[count] = class_device_attr_host_##field; \
i->private_host_attrs[count].attr.mode = S_IRUGO; \
i->private_host_attrs[count].store = NULL; \
i->host_attrs[count] = &i->private_host_attrs[count]; \
count++
#define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
i->private_host_attrs[count] = class_device_attr_host_##field; \
i->host_attrs[count] = &i->private_host_attrs[count]; \
count++
/* Fixed Host Attributes */
static ssize_t
show_fc_host_supported_classes (struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
return snprintf(buf, 20, "unspecified\n");
return get_fc_cos_names(fc_host_supported_classes(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
show_fc_host_supported_classes, NULL);
static ssize_t
show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
show_fc_host_supported_fc4s, NULL);
static ssize_t
show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
return snprintf(buf, 20, "unknown\n");
return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
show_fc_host_supported_speeds, NULL);
fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
/* Dynamic Host Attributes */
static ssize_t
show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
struct fc_internal *i = to_fc_internal(shost->transportt);
if (i->f->get_host_active_fc4s)
i->f->get_host_active_fc4s(shost);
return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
show_fc_host_active_fc4s, NULL);
static ssize_t
show_fc_host_speed (struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
struct fc_internal *i = to_fc_internal(shost->transportt);
if (i->f->get_host_speed)
i->f->get_host_speed(shost);
if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
return snprintf(buf, 20, "unknown\n");
return get_fc_port_speed_names(fc_host_speed(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
show_fc_host_speed, NULL);
fc_host_rd_attr(port_id, "0x%06x\n", 20);
fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
/* Private Host Attributes */
static ssize_t
show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
const char *name;
name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
if (!name)
return -EINVAL;
return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
}
static ssize_t
store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
const char *buf, size_t count)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
struct fc_rport *rport, *next_rport;
enum fc_tgtid_binding_type val;
unsigned long flags;
if (get_fc_tgtid_bind_type_match(buf, &val))
return -EINVAL;
/* if changing bind type, purge all unused consistent bindings */
if (val != fc_host_tgtid_bind_type(shost)) {
spin_lock_irqsave(shost->host_lock, flags);
list_for_each_entry_safe(rport, next_rport,
&fc_host_rport_bindings(shost), peers)
fc_rport_terminate(rport);
spin_unlock_irqrestore(shost->host_lock, flags);
}
fc_host_tgtid_bind_type(shost) = val;
return count;
}
static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
show_fc_private_host_tgtid_bind_type,
store_fc_private_host_tgtid_bind_type);
/*
* Host Statistics Management
*/
/* Show a given an attribute in the statistics group */
static ssize_t
fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
struct fc_internal *i = to_fc_internal(shost->transportt);
struct fc_host_statistics *stats;
ssize_t ret = -ENOENT;
if (offset > sizeof(struct fc_host_statistics) ||
offset % sizeof(u64) != 0)
WARN_ON(1);
if (i->f->get_fc_host_stats) {
stats = (i->f->get_fc_host_stats)(shost);
if (stats)
ret = snprintf(buf, 20, "0x%llx\n",
(unsigned long long)*(u64 *)(((u8 *) stats) + offset));
}
return ret;
}
/* generate a read-only statistics attribute */
#define fc_host_statistic(name) \
static ssize_t show_fcstat_##name(struct class_device *cd, char *buf) \
{ \
return fc_stat_show(cd, buf, \
offsetof(struct fc_host_statistics, name)); \
} \
static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
fc_host_statistic(seconds_since_last_reset);
fc_host_statistic(tx_frames);
fc_host_statistic(tx_words);
fc_host_statistic(rx_frames);
fc_host_statistic(rx_words);
fc_host_statistic(lip_count);
fc_host_statistic(nos_count);
fc_host_statistic(error_frames);
fc_host_statistic(dumped_frames);
fc_host_statistic(link_failure_count);
fc_host_statistic(loss_of_sync_count);
fc_host_statistic(loss_of_signal_count);
fc_host_statistic(prim_seq_protocol_err_count);
fc_host_statistic(invalid_tx_word_count);
fc_host_statistic(invalid_crc_count);
fc_host_statistic(fcp_input_requests);
fc_host_statistic(fcp_output_requests);
fc_host_statistic(fcp_control_requests);
fc_host_statistic(fcp_input_megabytes);
fc_host_statistic(fcp_output_megabytes);
static ssize_t
fc_reset_statistics(struct class_device *cdev, const char *buf,
size_t count)
{
struct Scsi_Host *shost = transport_class_to_shost(cdev);
struct fc_internal *i = to_fc_internal(shost->transportt);
/* ignore any data value written to the attribute */
if (i->f->reset_fc_host_stats) {
i->f->reset_fc_host_stats(shost);
return count;
}
return -ENOENT;
}
static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
fc_reset_statistics);
static struct attribute *fc_statistics_attrs[] = {
&class_device_attr_host_seconds_since_last_reset.attr,
&class_device_attr_host_tx_frames.attr,
&class_device_attr_host_tx_words.attr,
&class_device_attr_host_rx_frames.attr,
&class_device_attr_host_rx_words.attr,
&class_device_attr_host_lip_count.attr,
&class_device_attr_host_nos_count.attr,
&class_device_attr_host_error_frames.attr,
&class_device_attr_host_dumped_frames.attr,
&class_device_attr_host_link_failure_count.attr,
&class_device_attr_host_loss_of_sync_count.attr,
&class_device_attr_host_loss_of_signal_count.attr,
&class_device_attr_host_prim_seq_protocol_err_count.attr,
&class_device_attr_host_invalid_tx_word_count.attr,
&class_device_attr_host_invalid_crc_count.attr,
&class_device_attr_host_fcp_input_requests.attr,
&class_device_attr_host_fcp_output_requests.attr,
&class_device_attr_host_fcp_control_requests.attr,
&class_device_attr_host_fcp_input_megabytes.attr,
&class_device_attr_host_fcp_output_megabytes.attr,
&class_device_attr_host_reset_statistics.attr,
NULL
};
static struct attribute_group fc_statistics_group = {
.name = "statistics",
.attrs = fc_statistics_attrs,
};
static int fc_host_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct fc_internal *i;
if (!scsi_is_host_device(dev))
return 0;
shost = dev_to_shost(dev);
if (!shost->transportt || shost->transportt->host_attrs.ac.class
!= &fc_host_class.class)
return 0;
i = to_fc_internal(shost->transportt);
return &i->t.host_attrs.ac == cont;
}
static int fc_target_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct fc_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
!= &fc_host_class.class)
return 0;
i = to_fc_internal(shost->transportt);
return &i->t.target_attrs.ac == cont;
}
static void fc_rport_dev_release(struct device *dev)
{
struct fc_rport *rport = dev_to_rport(dev);
put_device(dev->parent);
kfree(rport);
}
int scsi_is_fc_rport(const struct device *dev)
{
return dev->release == fc_rport_dev_release;
}
EXPORT_SYMBOL(scsi_is_fc_rport);
static int fc_rport_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct fc_internal *i;
if (!scsi_is_fc_rport(dev))
return 0;
shost = dev_to_shost(dev->parent);
if (!shost->transportt || shost->transportt->host_attrs.ac.class
!= &fc_host_class.class)
return 0;
i = to_fc_internal(shost->transportt);
return &i->rport_attr_cont.ac == cont;
}
/*
* Must be called with shost->host_lock held
*/
static struct device *fc_target_parent(struct Scsi_Host *shost,
int channel, uint id)
{
struct fc_rport *rport;
list_for_each_entry(rport, &fc_host_rports(shost), peers)
if ((rport->channel == channel) &&
(rport->scsi_target_id == id))
return &rport->dev;
return NULL;
}
struct scsi_transport_template *
fc_attach_transport(struct fc_function_template *ft)
{
struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
GFP_KERNEL);
int count;
if (unlikely(!i))
return NULL;
memset(i, 0, sizeof(struct fc_internal));
i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
i->t.target_attrs.ac.class = &fc_transport_class.class;
i->t.target_attrs.ac.match = fc_target_match;
i->t.target_size = sizeof(struct fc_starget_attrs);
transport_container_register(&i->t.target_attrs);
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &fc_host_class.class;
i->t.host_attrs.ac.match = fc_host_match;
i->t.host_size = sizeof(struct fc_host_attrs);
if (ft->get_fc_host_stats)
i->t.host_attrs.statistics = &fc_statistics_group;
transport_container_register(&i->t.host_attrs);
i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
i->rport_attr_cont.ac.class = &fc_rport_class.class;
i->rport_attr_cont.ac.match = fc_rport_match;
transport_container_register(&i->rport_attr_cont);
i->f = ft;
/* Transport uses the shost workq for scsi scanning */
i->t.create_work_queue = 1;
i->t.target_parent = fc_target_parent;
/*
* Setup SCSI Target Attributes.
*/
count = 0;
SETUP_STARGET_ATTRIBUTE_RD(node_name);
SETUP_STARGET_ATTRIBUTE_RD(port_name);
SETUP_STARGET_ATTRIBUTE_RD(port_id);
BUG_ON(count > FC_STARGET_NUM_ATTRS);
i->starget_attrs[count] = NULL;
/*
* Setup SCSI Host Attributes.
*/
count=0;
SETUP_HOST_ATTRIBUTE_RD(node_name);
SETUP_HOST_ATTRIBUTE_RD(port_name);
SETUP_HOST_ATTRIBUTE_RD(supported_classes);
SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
SETUP_HOST_ATTRIBUTE_RD(serial_number);
SETUP_HOST_ATTRIBUTE_RD(port_id);
SETUP_HOST_ATTRIBUTE_RD(port_type);
SETUP_HOST_ATTRIBUTE_RD(port_state);
SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
SETUP_HOST_ATTRIBUTE_RD(speed);
SETUP_HOST_ATTRIBUTE_RD(fabric_name);
/* Transport-managed attributes */
SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
BUG_ON(count > FC_HOST_NUM_ATTRS);
i->host_attrs[count] = NULL;
/*
* Setup Remote Port Attributes.
*/
count=0;
SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
BUG_ON(count > FC_RPORT_NUM_ATTRS);
i->rport_attrs[count] = NULL;
return &i->t;
}
EXPORT_SYMBOL(fc_attach_transport);
void fc_release_transport(struct scsi_transport_template *t)
{
struct fc_internal *i = to_fc_internal(t);
transport_container_unregister(&i->t.target_attrs);
transport_container_unregister(&i->t.host_attrs);
transport_container_unregister(&i->rport_attr_cont);
kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);
/**
* fc_remove_host - called to terminate any fc_transport-related elements
* for a scsi host.
* @rport: remote port to be unblocked.
*
* This routine is expected to be called immediately preceeding the
* a driver's call to scsi_remove_host().
*
* WARNING: A driver utilizing the fc_transport, which fails to call
* this routine prior to scsi_remote_host(), will leave dangling
* objects in /sys/class/fc_remote_ports. Access to any of these
* objects can result in a system crash !!!
*
* Notes:
* This routine assumes no locks are held on entry.
**/
void
fc_remove_host(struct Scsi_Host *shost)
{
struct fc_rport *rport, *next_rport;
/* Remove any remote ports */
list_for_each_entry_safe(rport, next_rport,
&fc_host_rports(shost), peers)
fc_rport_terminate(rport);
list_for_each_entry_safe(rport, next_rport,
&fc_host_rport_bindings(shost), peers)
fc_rport_terminate(rport);
}
EXPORT_SYMBOL(fc_remove_host);
/**
* fc_rport_create - allocates and creates a remote FC port.
* @shost: scsi host the remote port is connected to.
* @channel: Channel on shost port connected to.
* @ids: The world wide names, fc address, and FC4 port
* roles for the remote port.
*
* Allocates and creates the remoter port structure, including the
* class and sysfs creation.
*
* Notes:
* This routine assumes no locks are held on entry.
**/
struct fc_rport *
fc_rport_create(struct Scsi_Host *shost, int channel,
struct fc_rport_identifiers *ids)
{
struct fc_host_attrs *fc_host =
(struct fc_host_attrs *)shost->shost_data;
struct fc_internal *fci = to_fc_internal(shost->transportt);
struct fc_rport *rport;
struct device *dev;
unsigned long flags;
int error;
size_t size;
size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
rport = kmalloc(size, GFP_KERNEL);
if (unlikely(!rport)) {
printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
return NULL;
}
memset(rport, 0, size);
rport->maxframe_size = -1;
rport->supported_classes = FC_COS_UNSPECIFIED;
rport->dev_loss_tmo = fc_dev_loss_tmo;
memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
rport->port_id = ids->port_id;
rport->roles = ids->roles;
rport->port_state = FC_PORTSTATE_ONLINE;
if (fci->f->dd_fcrport_size)
rport->dd_data = &rport[1];
rport->channel = channel;
INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
spin_lock_irqsave(shost->host_lock, flags);
rport->number = fc_host->next_rport_number++;
if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
rport->scsi_target_id = fc_host->next_target_id++;
else
rport->scsi_target_id = -1;
list_add_tail(&rport->peers, &fc_host_rports(shost));
get_device(&shost->shost_gendev);
spin_unlock_irqrestore(shost->host_lock, flags);
dev = &rport->dev;
device_initialize(dev);
dev->parent = get_device(&shost->shost_gendev);
dev->release = fc_rport_dev_release;
sprintf(dev->bus_id, "rport-%d:%d-%d",
shost->host_no, channel, rport->number);
transport_setup_device(dev);
error = device_add(dev);
if (error) {
printk(KERN_ERR "FC Remote Port device_add failed\n");
goto delete_rport;
}
transport_add_device(dev);
transport_configure_device(dev);
if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
/* initiate a scan of the target */
scsi_queue_work(shost, &rport->scan_work);
return rport;
delete_rport:
transport_destroy_device(dev);
put_device(dev->parent);
spin_lock_irqsave(shost->host_lock, flags);
list_del(&rport->peers);
put_device(&shost->shost_gendev);
spin_unlock_irqrestore(shost->host_lock, flags);
put_device(dev->parent);
kfree(rport);
return NULL;
}
/**
* fc_remote_port_add - notifies the fc transport of the existence
* of a remote FC port.
* @shost: scsi host the remote port is connected to.
* @channel: Channel on shost port connected to.
* @ids: The world wide names, fc address, and FC4 port
* roles for the remote port.
*
* The LLDD calls this routine to notify the transport of the existence
* of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
* of the port, it's FC address (port_id), and the FC4 roles that are
* active for the port.
*
* For ports that are FCP targets (aka scsi targets), the FC transport
* maintains consistent target id bindings on behalf of the LLDD.
* A consistent target id binding is an assignment of a target id to
* a remote port identifier, which persists while the scsi host is
* attached. The remote port can disappear, then later reappear, and
* it's target id assignment remains the same. This allows for shifts
* in FC addressing (if binding by wwpn or wwnn) with no apparent
* changes to the scsi subsystem which is based on scsi host number and
* target id values. Bindings are only valid during the attachment of
* the scsi host. If the host detaches, then later re-attaches, target
* id bindings may change.
*
* This routine is responsible for returning a remote port structure.
* The routine will search the list of remote ports it maintains
* internally on behalf of consistent target id mappings. If found, the
* remote port structure will be reused. Otherwise, a new remote port
* structure will be allocated.
*
* Whenever a remote port is allocated, a new fc_remote_port class
* device is created.
*
* Should not be called from interrupt context.
*
* Notes:
* This routine assumes no locks are held on entry.
**/
struct fc_rport *
fc_remote_port_add(struct Scsi_Host *shost, int channel,
struct fc_rport_identifiers *ids)
{
struct fc_rport *rport;
unsigned long flags;
int match = 0;
if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
(fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
/* search for a matching consistent binding */
spin_lock_irqsave(shost->host_lock, flags);
list_for_each_entry(rport, &fc_host_rport_bindings(shost),
peers) {
if (rport->channel != channel)
continue;
switch (fc_host_tgtid_bind_type(shost)) {
case FC_TGTID_BIND_BY_WWPN:
if (rport->port_name == ids->port_name)
match = 1;
break;
case FC_TGTID_BIND_BY_WWNN:
if (rport->node_name == ids->node_name)
match = 1;
break;
case FC_TGTID_BIND_BY_ID:
if (rport->port_id == ids->port_id)
match = 1;
break;
case FC_TGTID_BIND_NONE: /* to keep compiler happy */
break;
}
if (match) {
list_move_tail(&rport->peers,
&fc_host_rports(shost));
break;
}
}
spin_unlock_irqrestore(shost->host_lock, flags);
if (match) {
memcpy(&rport->node_name, &ids->node_name,
sizeof(rport->node_name));
memcpy(&rport->port_name, &ids->port_name,
sizeof(rport->port_name));
rport->port_id = ids->port_id;
rport->roles = ids->roles;
rport->port_state = FC_PORTSTATE_ONLINE;
if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
/* initiate a scan of the target */
scsi_queue_work(shost, &rport->scan_work);
return rport;
}
}
/* No consistent binding found - create new remote port entry */
rport = fc_rport_create(shost, channel, ids);
return rport;
}
EXPORT_SYMBOL(fc_remote_port_add);
/*
* fc_rport_tgt_remove - Removes the scsi target on the remote port
* @rport: The remote port to be operated on
*/
static void
fc_rport_tgt_remove(struct fc_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
scsi_target_unblock(&rport->dev);
/* Stop anything on the workq */
if (!cancel_delayed_work(&rport->dev_loss_work))
flush_scheduled_work();
scsi_flush_work(shost);
scsi_remove_target(&rport->dev);
}
/*
* fc_rport_terminate - this routine tears down and deallocates a remote port.
* @rport: The remote port to be terminated
*
* Notes:
* This routine assumes no locks are held on entry.
*/
static void
fc_rport_terminate(struct fc_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
struct device *dev = &rport->dev;
unsigned long flags;
fc_rport_tgt_remove(rport);
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
spin_lock_irqsave(shost->host_lock, flags);
list_del(&rport->peers);
spin_unlock_irqrestore(shost->host_lock, flags);
put_device(&shost->shost_gendev);
}
/**
* fc_remote_port_delete - notifies the fc transport that a remote
* port is no longer in existence.
* @rport: The remote port that no longer exists
*
* The LLDD calls this routine to notify the transport that a remote
* port is no longer part of the topology. Note: Although a port
* may no longer be part of the topology, it may persist in the remote
* ports displayed by the fc_host. This is done so that target id
* mappings (managed via the remote port structures), are always visible
* as long as the mapping is valid, regardless of port state,
*
* If the remote port is not an FCP Target, it will be fully torn down
* and deallocated, including the fc_remote_port class device.
*
* If the remote port is an FCP Target, the port structure will be
* marked as Not Present, but will remain as long as there is a valid
* SCSI target id mapping associated with the port structure. Validity
* is determined by the binding type. If binding by wwpn, then the port
* structure is always valid and will not be deallocated until the host
* is removed. If binding by wwnn, then the port structure is valid
* until another port with the same node name is found in the topology.
* If binding by port id (fc address), then the port structure is valid
* valid until another port with the same address is identified.
*
* Called from interrupt or normal process context.
*
* Notes:
* This routine assumes no locks are held on entry.
**/
void
fc_remote_port_delete(struct fc_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
unsigned long flags;
/* If no scsi target id mapping or consistent binding type, delete it */
if ((rport->scsi_target_id == -1) ||
(fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
fc_rport_terminate(rport);
return;
}
fc_rport_tgt_remove(rport);
spin_lock_irqsave(shost->host_lock, flags);
list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
spin_unlock_irqrestore(shost->host_lock, flags);
/*
* Note: We do not remove or clear the hostdata area. This allows
* host-specific target data to persist along with the
* scsi_target_id. It's up to the host to manage it's hostdata area.
*/
/*
* Reinitialize port attributes that may change if the port comes back.
*/
rport->maxframe_size = -1;
rport->supported_classes = FC_COS_UNSPECIFIED;
rport->roles = FC_RPORT_ROLE_UNKNOWN;
rport->port_state = FC_PORTSTATE_NOTPRESENT;
/* remove the identifiers that aren't used in the consisting binding */
switch (fc_host_tgtid_bind_type(shost)) {
case FC_TGTID_BIND_BY_WWPN:
rport->node_name = -1;
rport->port_id = -1;
break;
case FC_TGTID_BIND_BY_WWNN:
rport->port_name = -1;
rport->port_id = -1;
break;
case FC_TGTID_BIND_BY_ID:
rport->node_name = -1;
rport->port_name = -1;
break;
case FC_TGTID_BIND_NONE: /* to keep compiler happy */
break;
}
}
EXPORT_SYMBOL(fc_remote_port_delete);
/**
* fc_remote_port_rolechg - notifies the fc transport that the roles
* on a remote may have changed.
* @rport: The remote port that changed.
*
* The LLDD calls this routine to notify the transport that the roles
* on a remote port may have changed. The largest effect of this is
* if a port now becomes a FCP Target, it must be allocated a
* scsi target id. If the port is no longer a FCP target, any
* scsi target id value assigned to it will persist in case the
* role changes back to include FCP Target. No changes in the scsi
* midlayer will be invoked if the role changes (in the expectation
* that the role will be resumed. If it doesn't normal error processing
* will take place).
*
* Should not be called from interrupt context.
*
* Notes:
* This routine assumes no locks are held on entry.
**/
void
fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
{
struct Scsi_Host *shost = rport_to_shost(rport);
struct fc_host_attrs *fc_host =
(struct fc_host_attrs *)shost->shost_data;
unsigned long flags;
int create = 0;
rport->roles = roles;
spin_lock_irqsave(shost->host_lock, flags);
if ((rport->scsi_target_id == -1) &&
(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
rport->scsi_target_id = fc_host->next_target_id++;
create = 1;
}
spin_unlock_irqrestore(shost->host_lock, flags);
if (create)
/* initiate a scan of the target */
scsi_queue_work(shost, &rport->scan_work);
}
EXPORT_SYMBOL(fc_remote_port_rolechg);
/**
* fc_timeout_blocked_rport - Timeout handler for blocked remote port
* that fails to return in the alloted time.
* @data: scsi target that failed to reappear in the alloted time.
**/
static void
fc_timeout_blocked_rport(void *data)
{
struct fc_rport *rport = (struct fc_rport *)data;
rport->port_state = FC_PORTSTATE_OFFLINE;
dev_printk(KERN_ERR, &rport->dev,
"blocked FC remote port time out: removing target\n");
/*
* As this only occurs if the remote port (scsi target)
* went away and didn't come back - we'll remove
* all attached scsi devices.
*/
scsi_target_unblock(&rport->dev);
scsi_remove_target(&rport->dev);
}
/**
* fc_remote_port_block - temporarily block any scsi traffic to a remote port.
* @rport: remote port to be blocked.
*
* scsi lldd's with a FC transport call this routine to temporarily stop
* all scsi traffic to a remote port. If the port is not a SCSI target,
* no action is taken. If the port is a SCSI target, all attached devices
* are placed into a SDEV_BLOCK state and a timer is started. The timer is
* represents the maximum amount of time the port may be blocked. If the
* timer expires, the port is considered non-existent and the attached
* scsi devices will be removed.
*
* Called from interrupt or normal process context.
*
* Returns zero if successful or error if not
*
* Notes:
* This routine assumes no locks are held on entry.
*
* The timeout and timer types are extracted from the fc transport
* attributes from the caller's rport pointer.
**/
int
fc_remote_port_block(struct fc_rport *rport)
{
int timeout = rport->dev_loss_tmo;
struct work_struct *work = &rport->dev_loss_work;
if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
return -EINVAL;
scsi_target_block(&rport->dev);
/* cap the length the devices can be blocked */
schedule_delayed_work(work, timeout * HZ);
rport->port_state = FC_PORTSTATE_BLOCKED;
return 0;
}
EXPORT_SYMBOL(fc_remote_port_block);
/**
* fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
* @rport: remote port to be unblocked.
*
* scsi lld's with a FC transport call this routine to restart IO to all
* devices associated with the caller's scsi target following a fc_target_block
* request. Called from interrupt or normal process context.
*
* Notes:
* This routine assumes no locks are held on entry.
**/
void
fc_remote_port_unblock(struct fc_rport *rport)
{
struct work_struct *work = &rport->dev_loss_work;
struct Scsi_Host *shost = rport_to_shost(rport);
/*
* Stop the target timer first. Take no action on the del_timer
* failure as the state machine state change will validate the
* transaction.
*/
if (!cancel_delayed_work(work))
flush_scheduled_work();
if (rport->port_state == FC_PORTSTATE_OFFLINE)
/*
* initiate a scan of the target as the target has
* been torn down.
*/
scsi_queue_work(shost, &rport->scan_work);
else
scsi_target_unblock(&rport->dev);
rport->port_state = FC_PORTSTATE_ONLINE;
}
EXPORT_SYMBOL(fc_remote_port_unblock);
/**
* fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
* @data: remote port to be scanned.
**/
static void
fc_scsi_scan_rport(void *data)
{
struct fc_rport *rport = (struct fc_rport *)data;
scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
SCAN_WILD_CARD, 1);
}
MODULE_AUTHOR("Martin Hicks");
MODULE_DESCRIPTION("FC Transport Attributes");
MODULE_LICENSE("GPL");
module_init(fc_transport_init);
module_exit(fc_transport_exit);
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