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1 | /* |
2 | * iSCSI transport class definitions | |
3 | * | |
4 | * Copyright (C) IBM Corporation, 2004 | |
5 | * Copyright (C) Mike Christie, 2004 | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | #include <linux/module.h> | |
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_host.h> | |
24 | #include <scsi/scsi_device.h> | |
25 | #include <scsi/scsi_transport.h> | |
26 | #include <scsi/scsi_transport_iscsi.h> | |
27 | ||
28 | #define ISCSI_SESSION_ATTRS 20 | |
29 | #define ISCSI_HOST_ATTRS 2 | |
30 | ||
31 | struct iscsi_internal { | |
32 | struct scsi_transport_template t; | |
33 | struct iscsi_function_template *fnt; | |
34 | /* | |
35 | * We do not have any private or other attrs. | |
36 | */ | |
37 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; | |
38 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
39 | }; | |
40 | ||
41 | #define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t) | |
42 | ||
43 | static DECLARE_TRANSPORT_CLASS(iscsi_transport_class, | |
44 | "iscsi_transport", | |
45 | NULL, | |
46 | NULL, | |
47 | NULL); | |
48 | ||
49 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
50 | "iscsi_host", | |
51 | NULL, | |
52 | NULL, | |
53 | NULL); | |
54 | /* | |
55 | * iSCSI target and session attrs | |
56 | */ | |
57 | #define iscsi_session_show_fn(field, format) \ | |
58 | \ | |
59 | static ssize_t \ | |
60 | show_session_##field(struct class_device *cdev, char *buf) \ | |
61 | { \ | |
62 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
63 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
64 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ | |
65 | \ | |
66 | if (i->fnt->get_##field) \ | |
67 | i->fnt->get_##field(starget); \ | |
68 | return snprintf(buf, 20, format"\n", iscsi_##field(starget)); \ | |
69 | } | |
70 | ||
71 | #define iscsi_session_rd_attr(field, format) \ | |
72 | iscsi_session_show_fn(field, format) \ | |
73 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL); | |
74 | ||
75 | iscsi_session_rd_attr(tpgt, "%hu"); | |
76 | iscsi_session_rd_attr(tsih, "%2x"); | |
77 | iscsi_session_rd_attr(max_recv_data_segment_len, "%u"); | |
78 | iscsi_session_rd_attr(max_burst_len, "%u"); | |
79 | iscsi_session_rd_attr(first_burst_len, "%u"); | |
80 | iscsi_session_rd_attr(def_time2wait, "%hu"); | |
81 | iscsi_session_rd_attr(def_time2retain, "%hu"); | |
82 | iscsi_session_rd_attr(max_outstanding_r2t, "%hu"); | |
83 | iscsi_session_rd_attr(erl, "%d"); | |
84 | ||
85 | ||
86 | #define iscsi_session_show_bool_fn(field) \ | |
87 | \ | |
88 | static ssize_t \ | |
89 | show_session_bool_##field(struct class_device *cdev, char *buf) \ | |
90 | { \ | |
91 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
92 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
93 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ | |
94 | \ | |
95 | if (i->fnt->get_##field) \ | |
96 | i->fnt->get_##field(starget); \ | |
97 | \ | |
98 | if (iscsi_##field(starget)) \ | |
99 | return sprintf(buf, "Yes\n"); \ | |
100 | return sprintf(buf, "No\n"); \ | |
101 | } | |
102 | ||
103 | #define iscsi_session_rd_bool_attr(field) \ | |
104 | iscsi_session_show_bool_fn(field) \ | |
105 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL); | |
106 | ||
107 | iscsi_session_rd_bool_attr(initial_r2t); | |
108 | iscsi_session_rd_bool_attr(immediate_data); | |
109 | iscsi_session_rd_bool_attr(data_pdu_in_order); | |
110 | iscsi_session_rd_bool_attr(data_sequence_in_order); | |
111 | ||
112 | #define iscsi_session_show_digest_fn(field) \ | |
113 | \ | |
114 | static ssize_t \ | |
115 | show_##field(struct class_device *cdev, char *buf) \ | |
116 | { \ | |
117 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
118 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
119 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ | |
120 | \ | |
121 | if (i->fnt->get_##field) \ | |
122 | i->fnt->get_##field(starget); \ | |
123 | \ | |
124 | if (iscsi_##field(starget)) \ | |
125 | return sprintf(buf, "CRC32C\n"); \ | |
126 | return sprintf(buf, "None\n"); \ | |
127 | } | |
128 | ||
129 | #define iscsi_session_rd_digest_attr(field) \ | |
130 | iscsi_session_show_digest_fn(field) \ | |
131 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); | |
132 | ||
133 | iscsi_session_rd_digest_attr(header_digest); | |
134 | iscsi_session_rd_digest_attr(data_digest); | |
135 | ||
136 | static ssize_t | |
137 | show_port(struct class_device *cdev, char *buf) | |
138 | { | |
139 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
140 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
141 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); | |
142 | ||
143 | if (i->fnt->get_port) | |
144 | i->fnt->get_port(starget); | |
145 | ||
146 | return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget))); | |
147 | } | |
148 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
149 | ||
150 | static ssize_t | |
151 | show_ip_address(struct class_device *cdev, char *buf) | |
152 | { | |
153 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
154 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
155 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); | |
156 | ||
157 | if (i->fnt->get_ip_address) | |
158 | i->fnt->get_ip_address(starget); | |
159 | ||
160 | if (iscsi_addr_type(starget) == AF_INET) | |
161 | return sprintf(buf, "%u.%u.%u.%u\n", | |
162 | NIPQUAD(iscsi_sin_addr(starget))); | |
163 | else if(iscsi_addr_type(starget) == AF_INET6) | |
164 | return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
165 | NIP6(iscsi_sin6_addr(starget))); | |
166 | return -EINVAL; | |
167 | } | |
168 | static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL); | |
169 | ||
170 | static ssize_t | |
171 | show_isid(struct class_device *cdev, char *buf) | |
172 | { | |
173 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
174 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
175 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); | |
176 | ||
177 | if (i->fnt->get_isid) | |
178 | i->fnt->get_isid(starget); | |
179 | ||
180 | return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
181 | iscsi_isid(starget)[0], iscsi_isid(starget)[1], | |
182 | iscsi_isid(starget)[2], iscsi_isid(starget)[3], | |
183 | iscsi_isid(starget)[4], iscsi_isid(starget)[5]); | |
184 | } | |
185 | static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL); | |
186 | ||
187 | /* | |
188 | * This is used for iSCSI names. Normally, we follow | |
189 | * the transport class convention of having the lld | |
190 | * set the field, but in these cases the value is | |
191 | * too large. | |
192 | */ | |
193 | #define iscsi_session_show_str_fn(field) \ | |
194 | \ | |
195 | static ssize_t \ | |
196 | show_session_str_##field(struct class_device *cdev, char *buf) \ | |
197 | { \ | |
198 | ssize_t ret = 0; \ | |
199 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
200 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
201 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ | |
202 | \ | |
203 | if (i->fnt->get_##field) \ | |
204 | ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \ | |
205 | return ret; \ | |
206 | } | |
207 | ||
208 | #define iscsi_session_rd_str_attr(field) \ | |
209 | iscsi_session_show_str_fn(field) \ | |
210 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL); | |
211 | ||
212 | iscsi_session_rd_str_attr(target_name); | |
213 | iscsi_session_rd_str_attr(target_alias); | |
214 | ||
215 | /* | |
216 | * iSCSI host attrs | |
217 | */ | |
218 | ||
219 | /* | |
220 | * Again, this is used for iSCSI names. Normally, we follow | |
221 | * the transport class convention of having the lld set | |
222 | * the field, but in these cases the value is too large. | |
223 | */ | |
224 | #define iscsi_host_show_str_fn(field) \ | |
225 | \ | |
226 | static ssize_t \ | |
227 | show_host_str_##field(struct class_device *cdev, char *buf) \ | |
228 | { \ | |
229 | int ret = 0; \ | |
230 | struct Scsi_Host *shost = transport_class_to_shost(cdev); \ | |
231 | struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ | |
232 | \ | |
233 | if (i->fnt->get_##field) \ | |
234 | ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \ | |
235 | return ret; \ | |
236 | } | |
237 | ||
238 | #define iscsi_host_rd_str_attr(field) \ | |
239 | iscsi_host_show_str_fn(field) \ | |
240 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL); | |
241 | ||
242 | iscsi_host_rd_str_attr(initiator_name); | |
243 | iscsi_host_rd_str_attr(initiator_alias); | |
244 | ||
245 | #define SETUP_SESSION_RD_ATTR(field) \ | |
246 | if (i->fnt->show_##field) { \ | |
247 | i->session_attrs[count] = &class_device_attr_##field; \ | |
248 | count++; \ | |
249 | } | |
250 | ||
251 | #define SETUP_HOST_RD_ATTR(field) \ | |
252 | if (i->fnt->show_##field) { \ | |
253 | i->host_attrs[count] = &class_device_attr_##field; \ | |
254 | count++; \ | |
255 | } | |
256 | ||
257 | static int iscsi_host_match(struct attribute_container *cont, | |
258 | struct device *dev) | |
259 | { | |
260 | struct Scsi_Host *shost; | |
261 | struct iscsi_internal *i; | |
262 | ||
263 | if (!scsi_is_host_device(dev)) | |
264 | return 0; | |
265 | ||
266 | shost = dev_to_shost(dev); | |
267 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
268 | != &iscsi_host_class.class) | |
269 | return 0; | |
270 | ||
271 | i = to_iscsi_internal(shost->transportt); | |
272 | ||
273 | return &i->t.host_attrs.ac == cont; | |
274 | } | |
275 | ||
276 | static int iscsi_target_match(struct attribute_container *cont, | |
277 | struct device *dev) | |
278 | { | |
279 | struct Scsi_Host *shost; | |
280 | struct iscsi_internal *i; | |
281 | ||
282 | if (!scsi_is_target_device(dev)) | |
283 | return 0; | |
284 | ||
285 | shost = dev_to_shost(dev->parent); | |
286 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
287 | != &iscsi_host_class.class) | |
288 | return 0; | |
289 | ||
290 | i = to_iscsi_internal(shost->transportt); | |
291 | ||
292 | return &i->t.target_attrs.ac == cont; | |
293 | } | |
294 | ||
295 | struct scsi_transport_template * | |
296 | iscsi_attach_transport(struct iscsi_function_template *fnt) | |
297 | { | |
298 | struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal), | |
299 | GFP_KERNEL); | |
300 | int count = 0; | |
301 | ||
302 | if (unlikely(!i)) | |
303 | return NULL; | |
304 | ||
305 | memset(i, 0, sizeof(struct iscsi_internal)); | |
306 | i->fnt = fnt; | |
307 | ||
308 | i->t.target_attrs.ac.attrs = &i->session_attrs[0]; | |
309 | i->t.target_attrs.ac.class = &iscsi_transport_class.class; | |
310 | i->t.target_attrs.ac.match = iscsi_target_match; | |
311 | transport_container_register(&i->t.target_attrs); | |
312 | i->t.target_size = sizeof(struct iscsi_class_session); | |
313 | ||
314 | SETUP_SESSION_RD_ATTR(tsih); | |
315 | SETUP_SESSION_RD_ATTR(isid); | |
316 | SETUP_SESSION_RD_ATTR(header_digest); | |
317 | SETUP_SESSION_RD_ATTR(data_digest); | |
318 | SETUP_SESSION_RD_ATTR(target_name); | |
319 | SETUP_SESSION_RD_ATTR(target_alias); | |
320 | SETUP_SESSION_RD_ATTR(port); | |
321 | SETUP_SESSION_RD_ATTR(tpgt); | |
322 | SETUP_SESSION_RD_ATTR(ip_address); | |
323 | SETUP_SESSION_RD_ATTR(initial_r2t); | |
324 | SETUP_SESSION_RD_ATTR(immediate_data); | |
325 | SETUP_SESSION_RD_ATTR(max_recv_data_segment_len); | |
326 | SETUP_SESSION_RD_ATTR(max_burst_len); | |
327 | SETUP_SESSION_RD_ATTR(first_burst_len); | |
328 | SETUP_SESSION_RD_ATTR(def_time2wait); | |
329 | SETUP_SESSION_RD_ATTR(def_time2retain); | |
330 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t); | |
331 | SETUP_SESSION_RD_ATTR(data_pdu_in_order); | |
332 | SETUP_SESSION_RD_ATTR(data_sequence_in_order); | |
333 | SETUP_SESSION_RD_ATTR(erl); | |
334 | ||
335 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
336 | i->session_attrs[count] = NULL; | |
337 | ||
338 | i->t.host_attrs.ac.attrs = &i->host_attrs[0]; | |
339 | i->t.host_attrs.ac.class = &iscsi_host_class.class; | |
340 | i->t.host_attrs.ac.match = iscsi_host_match; | |
341 | transport_container_register(&i->t.host_attrs); | |
342 | i->t.host_size = 0; | |
343 | ||
344 | count = 0; | |
345 | SETUP_HOST_RD_ATTR(initiator_name); | |
346 | SETUP_HOST_RD_ATTR(initiator_alias); | |
347 | ||
348 | BUG_ON(count > ISCSI_HOST_ATTRS); | |
349 | i->host_attrs[count] = NULL; | |
350 | ||
351 | return &i->t; | |
352 | } | |
353 | ||
354 | EXPORT_SYMBOL(iscsi_attach_transport); | |
355 | ||
356 | void iscsi_release_transport(struct scsi_transport_template *t) | |
357 | { | |
358 | struct iscsi_internal *i = to_iscsi_internal(t); | |
359 | ||
360 | transport_container_unregister(&i->t.target_attrs); | |
361 | transport_container_unregister(&i->t.host_attrs); | |
362 | ||
363 | kfree(i); | |
364 | } | |
365 | ||
366 | EXPORT_SYMBOL(iscsi_release_transport); | |
367 | ||
368 | static __init int iscsi_transport_init(void) | |
369 | { | |
370 | int err = transport_class_register(&iscsi_transport_class); | |
371 | ||
372 | if (err) | |
373 | return err; | |
374 | return transport_class_register(&iscsi_host_class); | |
375 | } | |
376 | ||
377 | static void __exit iscsi_transport_exit(void) | |
378 | { | |
379 | transport_class_unregister(&iscsi_host_class); | |
380 | transport_class_unregister(&iscsi_transport_class); | |
381 | } | |
382 | ||
383 | module_init(iscsi_transport_init); | |
384 | module_exit(iscsi_transport_exit); | |
385 | ||
386 | MODULE_AUTHOR("Mike Christie"); | |
387 | MODULE_DESCRIPTION("iSCSI Transport Attributes"); | |
388 | MODULE_LICENSE("GPL"); |