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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* iSCSI session interfaces
*/
#include "iscsi.h" /* main header */
#include <sys/scsi/adapters/iscsi_if.h> /* ioctl interfaces */
/* protocol structs and defines */
#include <sys/iscsi_protocol.h>
#include "iscsi_targetparam.h"
#include "persistent.h"
#include <sys/scsi/adapters/iscsi_door.h>
#include <sys/dlpi.h>
#include <sys/ethernet.h>
#include <sys/utsname.h>
static iscsi_targetparams_t iscsi_targets;
static iscsi_targetparam_entry_t *iscsi_targetparam_create();
/*
* Initializes the target list structure. Called from iscsi_attach.
*/
void
iscsi_targetparam_init() {
iscsi_targets.target_list = NULL;
rw_init(&(iscsi_targets.target_list_lock), NULL,
RW_DRIVER, NULL);
}
/*
* Frees target param list and destroys the list lock.
*/
void
iscsi_targetparam_cleanup() {
iscsi_targetparam_entry_t *curr_entry, *tmp_entry;
iscsi_targetparam_lock_list(RW_WRITER);
curr_entry = iscsi_targets.target_list;
while (curr_entry) {
tmp_entry = curr_entry->next;
kmem_free(curr_entry, sizeof (iscsi_targetparam_entry_t));
curr_entry = tmp_entry;
}
iscsi_targetparam_unlock_list();
rw_destroy(&iscsi_targets.target_list_lock);
}
/*
* Creates a target param entry and adds it to the target param
* entry list.
*
*/
static iscsi_targetparam_entry_t *
iscsi_targetparam_create(uchar_t *name) {
iscsi_targetparam_entry_t *target;
ASSERT(name != NULL);
target = kmem_alloc(sizeof (iscsi_targetparam_entry_t),
KM_SLEEP);
(void) strlcpy((char *)target->target_name, (char *)name,
sizeof (target->target_name));
/* assign unique key for the target */
mutex_enter(&iscsi_oid_mutex);
target->target_oid = iscsi_oid++;
mutex_exit(&iscsi_oid_mutex);
/* Add new target to the target list */
iscsi_targetparam_lock_list(RW_WRITER);
if (iscsi_targets.target_list == NULL) {
iscsi_targets.target_list = target;
iscsi_targets.target_list->next = NULL;
} else {
target->next = iscsi_targets.target_list;
iscsi_targets.target_list = target;
}
iscsi_targetparam_unlock_list();
return (target);
}
/*
* Returns a target param entry's oid given the target name. If the target
* param entry cannot be found one is created and the new oid is returned.
*
*/
uint32_t
iscsi_targetparam_get_oid(uchar_t *name) {
int name_length;
iscsi_targetparam_entry_t *curr_entry;
ASSERT(name != NULL);
name_length = strlen((char *)name);
iscsi_targetparam_lock_list(RW_READER);
curr_entry = iscsi_targetparam_get_next_entry(NULL);
while (curr_entry != NULL) {
if ((name_length == strlen((char *)curr_entry->target_name)) &&
(bcmp(curr_entry->target_name,
(char *)name, name_length) == 0)) {
iscsi_targetparam_unlock_list();
return (curr_entry->target_oid);
}
curr_entry = iscsi_targetparam_get_next_entry(curr_entry);
}
iscsi_targetparam_unlock_list();
curr_entry = iscsi_targetparam_create(name);
return (curr_entry->target_oid);
}
/*
* Returns a target param entry's target name given its oid. If the oid cannot
* be found, NULL is returned.
*
*/
uchar_t *iscsi_targetparam_get_name(uint32_t oid) {
iscsi_targetparam_entry_t *curr_entry;
iscsi_targetparam_lock_list(RW_READER);
curr_entry = iscsi_targetparam_get_next_entry(NULL);
while (curr_entry != NULL) {
if (curr_entry->target_oid == oid) {
iscsi_targetparam_unlock_list();
return (curr_entry->target_name);
}
curr_entry = iscsi_targetparam_get_next_entry(curr_entry);
}
iscsi_targetparam_unlock_list();
return (NULL);
}
/*
* Removes a target param entry from the target param entry list. The
* oid is used to lookup the entry to be removed.
*
*/
int
iscsi_targetparam_remove_target(uint32_t oid) {
iscsi_targetparam_entry_t *prev_entry, *curr_entry;
prev_entry = NULL;
iscsi_targetparam_lock_list(RW_WRITER);
curr_entry = iscsi_targetparam_get_next_entry(NULL);
while (curr_entry != NULL) {
if (curr_entry->target_oid == oid) {
if (prev_entry == NULL) {
iscsi_targets.target_list = curr_entry->next;
} else if (curr_entry->next == NULL) {
ASSERT(prev_entry != NULL);
prev_entry->next = NULL;
} else {
ASSERT(prev_entry != NULL);
ASSERT(curr_entry != NULL);
prev_entry->next = curr_entry->next;
}
kmem_free(curr_entry,
sizeof (iscsi_targetparam_entry_t));
iscsi_targetparam_unlock_list();
return (0);
}
prev_entry = curr_entry;
curr_entry = iscsi_targetparam_get_next_entry(curr_entry);
}
iscsi_targetparam_unlock_list();
return (0);
}
/*
* Returns the next element in the target param entry list. If
* NULL is passed as the reference entry then the first item in
* the list is returned. NULL will be returned when the last
* element in the list is used as the reference entry.
*
*/
iscsi_targetparam_entry_t *
iscsi_targetparam_get_next_entry(iscsi_targetparam_entry_t *ref_entry) {
iscsi_targetparam_entry_t *entry;
if (ref_entry == NULL) {
entry = iscsi_targets.target_list;
} else {
entry = ref_entry->next;
}
return (entry);
}
/*
* Lock target param list.
*
*/
void
iscsi_targetparam_lock_list(krw_t type) {
rw_enter(&(iscsi_targets.target_list_lock), type);
}
/*
* Unlock target param list.
*
*/
void
iscsi_targetparam_unlock_list() {
rw_exit(&(iscsi_targets.target_list_lock));
}
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