diff options
Diffstat (limited to 'drivers/target/target_core_hba.c')
| -rw-r--r-- | drivers/target/target_core_hba.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c new file mode 100644 index 00000000000..4bbe8208b24 --- /dev/null +++ b/drivers/target/target_core_hba.c @@ -0,0 +1,185 @@ +/******************************************************************************* + * Filename: target_core_hba.c + * + * This file copntains the iSCSI HBA Transport related functions. + * + * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. + * Copyright (c) 2005, 2006, 2007 SBE, Inc. + * Copyright (c) 2007-2010 Rising Tide Systems + * Copyright (c) 2008-2010 Linux-iSCSI.org + * + * Nicholas A. Bellinger <nab@kernel.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; 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/net.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/smp_lock.h> +#include <linux/in.h> +#include <net/sock.h> +#include <net/tcp.h> + +#include <target/target_core_base.h> +#include <target/target_core_device.h> +#include <target/target_core_device.h> +#include <target/target_core_tpg.h> +#include <target/target_core_transport.h> + +#include "target_core_hba.h" + +static LIST_HEAD(subsystem_list); +static DEFINE_MUTEX(subsystem_mutex); + +int transport_subsystem_register(struct se_subsystem_api *sub_api) +{ + struct se_subsystem_api *s; + + INIT_LIST_HEAD(&sub_api->sub_api_list); + + mutex_lock(&subsystem_mutex); + list_for_each_entry(s, &subsystem_list, sub_api_list) { + if (!(strcmp(s->name, sub_api->name))) { + printk(KERN_ERR "%p is already registered with" + " duplicate name %s, unable to process" + " request\n", s, s->name); + mutex_unlock(&subsystem_mutex); + return -EEXIST; + } + } + list_add_tail(&sub_api->sub_api_list, &subsystem_list); + mutex_unlock(&subsystem_mutex); + + printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:" + " %p\n", sub_api->name, sub_api->owner); + return 0; +} +EXPORT_SYMBOL(transport_subsystem_register); + +void transport_subsystem_release(struct se_subsystem_api *sub_api) +{ + mutex_lock(&subsystem_mutex); + list_del(&sub_api->sub_api_list); + mutex_unlock(&subsystem_mutex); +} +EXPORT_SYMBOL(transport_subsystem_release); + +static struct se_subsystem_api *core_get_backend(const char *sub_name) +{ + struct se_subsystem_api *s; + + mutex_lock(&subsystem_mutex); + list_for_each_entry(s, &subsystem_list, sub_api_list) { + if (!strcmp(s->name, sub_name)) + goto found; + } + mutex_unlock(&subsystem_mutex); + return NULL; +found: + if (s->owner && !try_module_get(s->owner)) + s = NULL; + mutex_unlock(&subsystem_mutex); + return s; +} + +struct se_hba * +core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags) +{ + struct se_hba *hba; + int ret = 0; + + hba = kzalloc(sizeof(*hba), GFP_KERNEL); + if (!hba) { + printk(KERN_ERR "Unable to allocate struct se_hba\n"); + return ERR_PTR(-ENOMEM); + } + + INIT_LIST_HEAD(&hba->hba_dev_list); + spin_lock_init(&hba->device_lock); + spin_lock_init(&hba->hba_queue_lock); + mutex_init(&hba->hba_access_mutex); + + hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX); + hba->hba_flags |= hba_flags; + + atomic_set(&hba->max_queue_depth, 0); + atomic_set(&hba->left_queue_depth, 0); + + hba->transport = core_get_backend(plugin_name); + if (!hba->transport) { + ret = -EINVAL; + goto out_free_hba; + } + + ret = hba->transport->attach_hba(hba, plugin_dep_id); + if (ret < 0) + goto out_module_put; + + spin_lock(&se_global->hba_lock); + hba->hba_id = se_global->g_hba_id_counter++; + list_add_tail(&hba->hba_list, &se_global->g_hba_list); + spin_unlock(&se_global->hba_lock); + + printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target" + " Core\n", hba->hba_id); + + return hba; + +out_module_put: + if (hba->transport->owner) + module_put(hba->transport->owner); + hba->transport = NULL; +out_free_hba: + kfree(hba); + return ERR_PTR(ret); +} + +int +core_delete_hba(struct se_hba *hba) +{ + struct se_device *dev, *dev_tmp; + + spin_lock(&hba->device_lock); + list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) { + + se_clear_dev_ports(dev); + spin_unlock(&hba->device_lock); + + se_release_device_for_hba(dev); + + spin_lock(&hba->device_lock); + } + spin_unlock(&hba->device_lock); + + hba->transport->detach_hba(hba); + + spin_lock(&se_global->hba_lock); + list_del(&hba->hba_list); + spin_unlock(&se_global->hba_lock); + + printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target" + " Core\n", hba->hba_id); + + if (hba->transport->owner) + module_put(hba->transport->owner); + + hba->transport = NULL; + kfree(hba); + return 0; +} |