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> | |
c66ac9db | 39 | |
e26d99ae | 40 | #include "target_core_internal.h" |
c66ac9db NB |
41 | |
42 | static LIST_HEAD(subsystem_list); | |
43 | static DEFINE_MUTEX(subsystem_mutex); | |
44 | ||
e3d6f909 AG |
45 | static u32 hba_id_counter; |
46 | ||
47 | static DEFINE_SPINLOCK(hba_lock); | |
48 | static LIST_HEAD(hba_list); | |
49 | ||
c66ac9db NB |
50 | int transport_subsystem_register(struct se_subsystem_api *sub_api) |
51 | { | |
52 | struct se_subsystem_api *s; | |
53 | ||
54 | INIT_LIST_HEAD(&sub_api->sub_api_list); | |
55 | ||
56 | mutex_lock(&subsystem_mutex); | |
57 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
6708bb27 AG |
58 | if (!strcmp(s->name, sub_api->name)) { |
59 | pr_err("%p is already registered with" | |
c66ac9db NB |
60 | " duplicate name %s, unable to process" |
61 | " request\n", s, s->name); | |
62 | mutex_unlock(&subsystem_mutex); | |
63 | return -EEXIST; | |
64 | } | |
65 | } | |
66 | list_add_tail(&sub_api->sub_api_list, &subsystem_list); | |
67 | mutex_unlock(&subsystem_mutex); | |
68 | ||
6708bb27 | 69 | pr_debug("TCM: Registered subsystem plugin: %s struct module:" |
c66ac9db NB |
70 | " %p\n", sub_api->name, sub_api->owner); |
71 | return 0; | |
72 | } | |
73 | EXPORT_SYMBOL(transport_subsystem_register); | |
74 | ||
75 | void transport_subsystem_release(struct se_subsystem_api *sub_api) | |
76 | { | |
77 | mutex_lock(&subsystem_mutex); | |
78 | list_del(&sub_api->sub_api_list); | |
79 | mutex_unlock(&subsystem_mutex); | |
80 | } | |
81 | EXPORT_SYMBOL(transport_subsystem_release); | |
82 | ||
83 | static struct se_subsystem_api *core_get_backend(const char *sub_name) | |
84 | { | |
85 | struct se_subsystem_api *s; | |
86 | ||
87 | mutex_lock(&subsystem_mutex); | |
88 | list_for_each_entry(s, &subsystem_list, sub_api_list) { | |
89 | if (!strcmp(s->name, sub_name)) | |
90 | goto found; | |
91 | } | |
92 | mutex_unlock(&subsystem_mutex); | |
93 | return NULL; | |
94 | found: | |
95 | if (s->owner && !try_module_get(s->owner)) | |
96 | s = NULL; | |
97 | mutex_unlock(&subsystem_mutex); | |
98 | return s; | |
99 | } | |
100 | ||
101 | struct se_hba * | |
102 | core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags) | |
103 | { | |
104 | struct se_hba *hba; | |
105 | int ret = 0; | |
106 | ||
107 | hba = kzalloc(sizeof(*hba), GFP_KERNEL); | |
108 | if (!hba) { | |
6708bb27 | 109 | pr_err("Unable to allocate struct se_hba\n"); |
c66ac9db NB |
110 | return ERR_PTR(-ENOMEM); |
111 | } | |
112 | ||
c66ac9db | 113 | spin_lock_init(&hba->device_lock); |
c66ac9db NB |
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 | ||
c66ac9db NB |
119 | hba->transport = core_get_backend(plugin_name); |
120 | if (!hba->transport) { | |
121 | ret = -EINVAL; | |
122 | goto out_free_hba; | |
123 | } | |
124 | ||
125 | ret = hba->transport->attach_hba(hba, plugin_dep_id); | |
126 | if (ret < 0) | |
127 | goto out_module_put; | |
128 | ||
e3d6f909 AG |
129 | spin_lock(&hba_lock); |
130 | hba->hba_id = hba_id_counter++; | |
131 | list_add_tail(&hba->hba_node, &hba_list); | |
132 | spin_unlock(&hba_lock); | |
c66ac9db | 133 | |
6708bb27 | 134 | pr_debug("CORE_HBA[%d] - Attached HBA to Generic Target" |
c66ac9db NB |
135 | " Core\n", hba->hba_id); |
136 | ||
137 | return hba; | |
138 | ||
139 | out_module_put: | |
2ed37f6c | 140 | module_put(hba->transport->owner); |
c66ac9db NB |
141 | hba->transport = NULL; |
142 | out_free_hba: | |
143 | kfree(hba); | |
144 | return ERR_PTR(ret); | |
145 | } | |
146 | ||
147 | int | |
148 | core_delete_hba(struct se_hba *hba) | |
149 | { | |
0fd97ccf | 150 | WARN_ON(hba->dev_count); |
c66ac9db NB |
151 | |
152 | hba->transport->detach_hba(hba); | |
153 | ||
e3d6f909 AG |
154 | spin_lock(&hba_lock); |
155 | list_del(&hba->hba_node); | |
156 | spin_unlock(&hba_lock); | |
c66ac9db | 157 | |
6708bb27 | 158 | pr_debug("CORE_HBA[%d] - Detached HBA from Generic Target" |
c66ac9db NB |
159 | " Core\n", hba->hba_id); |
160 | ||
2ed37f6c | 161 | module_put(hba->transport->owner); |
c66ac9db NB |
162 | |
163 | hba->transport = NULL; | |
164 | kfree(hba); | |
165 | return 0; | |
166 | } |