Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_hba.c | |
3 | * | |
e3d6f909 | 4 | * This file contains the TCM HBA Transport related functions. |
c66ac9db | 5 | * |
4c76251e | 6 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
26 | #include <linux/net.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/spinlock.h> | |
c66ac9db | 31 | #include <linux/in.h> |
827509e3 | 32 | #include <linux/module.h> |
c66ac9db NB |
33 | #include <net/sock.h> |
34 | #include <net/tcp.h> | |
35 | ||
36 | #include <target/target_core_base.h> | |
c4795fb2 CH |
37 | #include <target/target_core_backend.h> |
38 | #include <target/target_core_fabric.h> | |
73112edc | 39 | #include <target/target_core_configfs.h> |
c66ac9db | 40 | |
e26d99ae | 41 | #include "target_core_internal.h" |
c66ac9db NB |
42 | |
43 | static LIST_HEAD(subsystem_list); | |
44 | static DEFINE_MUTEX(subsystem_mutex); | |
45 | ||
e3d6f909 AG |
46 | static u32 hba_id_counter; |
47 | ||
48 | static DEFINE_SPINLOCK(hba_lock); | |
49 | static LIST_HEAD(hba_list); | |
50 | ||
c66ac9db NB |
51 | int transport_subsystem_register(struct se_subsystem_api *sub_api) |
52 | { | |
53 | struct se_subsystem_api *s; | |
54 | ||
55 | INIT_LIST_HEAD(&sub_api->sub_api_list); | |
56 | ||
57 | mutex_lock(&subsystem_mutex); | |
58 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
6708bb27 AG |
59 | if (!strcmp(s->name, sub_api->name)) { |
60 | pr_err("%p is already registered with" | |
c66ac9db NB |
61 | " duplicate name %s, unable to process" |
62 | " request\n", s, s->name); | |
63 | mutex_unlock(&subsystem_mutex); | |
64 | return -EEXIST; | |
65 | } | |
66 | } | |
67 | list_add_tail(&sub_api->sub_api_list, &subsystem_list); | |
68 | mutex_unlock(&subsystem_mutex); | |
69 | ||
6708bb27 | 70 | pr_debug("TCM: Registered subsystem plugin: %s struct module:" |
c66ac9db NB |
71 | " %p\n", sub_api->name, sub_api->owner); |
72 | return 0; | |
73 | } | |
74 | EXPORT_SYMBOL(transport_subsystem_register); | |
75 | ||
76 | void transport_subsystem_release(struct se_subsystem_api *sub_api) | |
77 | { | |
78 | mutex_lock(&subsystem_mutex); | |
79 | list_del(&sub_api->sub_api_list); | |
80 | mutex_unlock(&subsystem_mutex); | |
81 | } | |
82 | EXPORT_SYMBOL(transport_subsystem_release); | |
83 | ||
84 | static struct se_subsystem_api *core_get_backend(const char *sub_name) | |
85 | { | |
86 | struct se_subsystem_api *s; | |
87 | ||
88 | mutex_lock(&subsystem_mutex); | |
89 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
90 | if (!strcmp(s->name, sub_name)) | |
91 | goto found; | |
92 | } | |
93 | mutex_unlock(&subsystem_mutex); | |
94 | return NULL; | |
95 | found: | |
96 | if (s->owner && !try_module_get(s->owner)) | |
97 | s = NULL; | |
98 | mutex_unlock(&subsystem_mutex); | |
99 | return s; | |
100 | } | |
101 | ||
102 | struct se_hba * | |
103 | core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags) | |
104 | { | |
105 | struct se_hba *hba; | |
106 | int ret = 0; | |
107 | ||
108 | hba = kzalloc(sizeof(*hba), GFP_KERNEL); | |
109 | if (!hba) { | |
6708bb27 | 110 | pr_err("Unable to allocate struct se_hba\n"); |
c66ac9db NB |
111 | return ERR_PTR(-ENOMEM); |
112 | } | |
113 | ||
c66ac9db | 114 | spin_lock_init(&hba->device_lock); |
c66ac9db NB |
115 | mutex_init(&hba->hba_access_mutex); |
116 | ||
117 | hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX); | |
118 | hba->hba_flags |= hba_flags; | |
119 | ||
c66ac9db NB |
120 | hba->transport = core_get_backend(plugin_name); |
121 | if (!hba->transport) { | |
122 | ret = -EINVAL; | |
123 | goto out_free_hba; | |
124 | } | |
125 | ||
126 | ret = hba->transport->attach_hba(hba, plugin_dep_id); | |
127 | if (ret < 0) | |
128 | goto out_module_put; | |
129 | ||
e3d6f909 AG |
130 | spin_lock(&hba_lock); |
131 | hba->hba_id = hba_id_counter++; | |
132 | list_add_tail(&hba->hba_node, &hba_list); | |
133 | spin_unlock(&hba_lock); | |
c66ac9db | 134 | |
6708bb27 | 135 | pr_debug("CORE_HBA[%d] - Attached HBA to Generic Target" |
c66ac9db NB |
136 | " Core\n", hba->hba_id); |
137 | ||
138 | return hba; | |
139 | ||
140 | out_module_put: | |
2ed37f6c | 141 | module_put(hba->transport->owner); |
c66ac9db NB |
142 | hba->transport = NULL; |
143 | out_free_hba: | |
144 | kfree(hba); | |
145 | return ERR_PTR(ret); | |
146 | } | |
147 | ||
148 | int | |
149 | core_delete_hba(struct se_hba *hba) | |
150 | { | |
0fd97ccf | 151 | WARN_ON(hba->dev_count); |
c66ac9db NB |
152 | |
153 | hba->transport->detach_hba(hba); | |
154 | ||
e3d6f909 AG |
155 | spin_lock(&hba_lock); |
156 | list_del(&hba->hba_node); | |
157 | spin_unlock(&hba_lock); | |
c66ac9db | 158 | |
6708bb27 | 159 | pr_debug("CORE_HBA[%d] - Detached HBA from Generic Target" |
c66ac9db NB |
160 | " Core\n", hba->hba_id); |
161 | ||
2ed37f6c | 162 | module_put(hba->transport->owner); |
c66ac9db NB |
163 | |
164 | hba->transport = NULL; | |
165 | kfree(hba); | |
166 | return 0; | |
167 | } |