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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_hba.c | |
3 | * | |
4 | * This file copntains the iSCSI HBA Transport related functions. | |
5 | * | |
6 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
29 | #include <linux/net.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
c66ac9db NB |
34 | #include <linux/in.h> |
35 | #include <net/sock.h> | |
36 | #include <net/tcp.h> | |
37 | ||
38 | #include <target/target_core_base.h> | |
39 | #include <target/target_core_device.h> | |
c66ac9db NB |
40 | #include <target/target_core_tpg.h> |
41 | #include <target/target_core_transport.h> | |
42 | ||
43 | #include "target_core_hba.h" | |
44 | ||
45 | static LIST_HEAD(subsystem_list); | |
46 | static DEFINE_MUTEX(subsystem_mutex); | |
47 | ||
48 | int transport_subsystem_register(struct se_subsystem_api *sub_api) | |
49 | { | |
50 | struct se_subsystem_api *s; | |
51 | ||
52 | INIT_LIST_HEAD(&sub_api->sub_api_list); | |
53 | ||
54 | mutex_lock(&subsystem_mutex); | |
55 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
56 | if (!(strcmp(s->name, sub_api->name))) { | |
57 | printk(KERN_ERR "%p is already registered with" | |
58 | " duplicate name %s, unable to process" | |
59 | " request\n", s, s->name); | |
60 | mutex_unlock(&subsystem_mutex); | |
61 | return -EEXIST; | |
62 | } | |
63 | } | |
64 | list_add_tail(&sub_api->sub_api_list, &subsystem_list); | |
65 | mutex_unlock(&subsystem_mutex); | |
66 | ||
67 | printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:" | |
68 | " %p\n", sub_api->name, sub_api->owner); | |
69 | return 0; | |
70 | } | |
71 | EXPORT_SYMBOL(transport_subsystem_register); | |
72 | ||
73 | void transport_subsystem_release(struct se_subsystem_api *sub_api) | |
74 | { | |
75 | mutex_lock(&subsystem_mutex); | |
76 | list_del(&sub_api->sub_api_list); | |
77 | mutex_unlock(&subsystem_mutex); | |
78 | } | |
79 | EXPORT_SYMBOL(transport_subsystem_release); | |
80 | ||
81 | static struct se_subsystem_api *core_get_backend(const char *sub_name) | |
82 | { | |
83 | struct se_subsystem_api *s; | |
84 | ||
85 | mutex_lock(&subsystem_mutex); | |
86 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
87 | if (!strcmp(s->name, sub_name)) | |
88 | goto found; | |
89 | } | |
90 | mutex_unlock(&subsystem_mutex); | |
91 | return NULL; | |
92 | found: | |
93 | if (s->owner && !try_module_get(s->owner)) | |
94 | s = NULL; | |
95 | mutex_unlock(&subsystem_mutex); | |
96 | return s; | |
97 | } | |
98 | ||
99 | struct se_hba * | |
100 | core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags) | |
101 | { | |
102 | struct se_hba *hba; | |
103 | int ret = 0; | |
104 | ||
105 | hba = kzalloc(sizeof(*hba), GFP_KERNEL); | |
106 | if (!hba) { | |
107 | printk(KERN_ERR "Unable to allocate struct se_hba\n"); | |
108 | return ERR_PTR(-ENOMEM); | |
109 | } | |
110 | ||
111 | INIT_LIST_HEAD(&hba->hba_dev_list); | |
112 | spin_lock_init(&hba->device_lock); | |
113 | spin_lock_init(&hba->hba_queue_lock); | |
114 | mutex_init(&hba->hba_access_mutex); | |
115 | ||
116 | hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX); | |
117 | hba->hba_flags |= hba_flags; | |
118 | ||
119 | atomic_set(&hba->max_queue_depth, 0); | |
120 | atomic_set(&hba->left_queue_depth, 0); | |
121 | ||
122 | hba->transport = core_get_backend(plugin_name); | |
123 | if (!hba->transport) { | |
124 | ret = -EINVAL; | |
125 | goto out_free_hba; | |
126 | } | |
127 | ||
128 | ret = hba->transport->attach_hba(hba, plugin_dep_id); | |
129 | if (ret < 0) | |
130 | goto out_module_put; | |
131 | ||
132 | spin_lock(&se_global->hba_lock); | |
133 | hba->hba_id = se_global->g_hba_id_counter++; | |
134 | list_add_tail(&hba->hba_list, &se_global->g_hba_list); | |
135 | spin_unlock(&se_global->hba_lock); | |
136 | ||
137 | printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target" | |
138 | " Core\n", hba->hba_id); | |
139 | ||
140 | return hba; | |
141 | ||
142 | out_module_put: | |
143 | if (hba->transport->owner) | |
144 | module_put(hba->transport->owner); | |
145 | hba->transport = NULL; | |
146 | out_free_hba: | |
147 | kfree(hba); | |
148 | return ERR_PTR(ret); | |
149 | } | |
150 | ||
151 | int | |
152 | core_delete_hba(struct se_hba *hba) | |
153 | { | |
05aea6e7 FC |
154 | if (!list_empty(&hba->hba_dev_list)) |
155 | dump_stack(); | |
c66ac9db NB |
156 | |
157 | hba->transport->detach_hba(hba); | |
158 | ||
159 | spin_lock(&se_global->hba_lock); | |
160 | list_del(&hba->hba_list); | |
161 | spin_unlock(&se_global->hba_lock); | |
162 | ||
163 | printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target" | |
164 | " Core\n", hba->hba_id); | |
165 | ||
166 | if (hba->transport->owner) | |
167 | module_put(hba->transport->owner); | |
168 | ||
169 | hba->transport = NULL; | |
170 | kfree(hba); | |
171 | return 0; | |
172 | } |