aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/scsi_transport_iscsi.c
blob: 8bb8222ea58961e8b654621befd41700e5588904 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
/* 
 * iSCSI transport class definitions
 *
 * Copyright (C) IBM Corporation, 2004
 * Copyright (C) Mike Christie, 2004
 *
 * 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/module.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_iscsi.h>

#define ISCSI_SESSION_ATTRS 20
#define ISCSI_HOST_ATTRS 2

struct iscsi_internal {
	struct scsi_transport_template t;
	struct iscsi_function_template *fnt;
	/*
	 * We do not have any private or other attrs.
	 */
	struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
	struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
};

#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)

static DECLARE_TRANSPORT_CLASS(iscsi_transport_class,
			       "iscsi_transport",
			       NULL,
			       NULL,
			       NULL);

static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
			       "iscsi_host",
			       NULL,
			       NULL,
			       NULL);
/*
 * iSCSI target and session attrs
 */
#define iscsi_session_show_fn(field, format)				\
									\
static ssize_t								\
show_session_##field(struct class_device *cdev, char *buf)		\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
									\
	if (i->fnt->get_##field)					\
		i->fnt->get_##field(starget);				\
	return snprintf(buf, 20, format"\n", iscsi_##field(starget));	\
}

#define iscsi_session_rd_attr(field, format)				\
	iscsi_session_show_fn(field, format)				\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL);

iscsi_session_rd_attr(tpgt, "%hu");
iscsi_session_rd_attr(tsih, "%2x");
iscsi_session_rd_attr(max_recv_data_segment_len, "%u");
iscsi_session_rd_attr(max_burst_len, "%u");
iscsi_session_rd_attr(first_burst_len, "%u");
iscsi_session_rd_attr(def_time2wait, "%hu");
iscsi_session_rd_attr(def_time2retain, "%hu");
iscsi_session_rd_attr(max_outstanding_r2t, "%hu");
iscsi_session_rd_attr(erl, "%d");


#define iscsi_session_show_bool_fn(field)				\
									\
static ssize_t								\
show_session_bool_##field(struct class_device *cdev, char *buf)		\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
									\
	if (i->fnt->get_##field)					\
		i->fnt->get_##field(starget);				\
									\
	if (iscsi_##field(starget))					\
		return sprintf(buf, "Yes\n");				\
	return sprintf(buf, "No\n");					\
}

#define iscsi_session_rd_bool_attr(field)				\
	iscsi_session_show_bool_fn(field)				\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL);

iscsi_session_rd_bool_attr(initial_r2t);
iscsi_session_rd_bool_attr(immediate_data);
iscsi_session_rd_bool_attr(data_pdu_in_order);
iscsi_session_rd_bool_attr(data_sequence_in_order);

#define iscsi_session_show_digest_fn(field)				\
									\
static ssize_t								\
show_##field(struct class_device *cdev, char *buf)			\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
									\
	if (i->fnt->get_##field)					\
		i->fnt->get_##field(starget);				\
									\
	if (iscsi_##field(starget))					\
		return sprintf(buf, "CRC32C\n");			\
	return sprintf(buf, "None\n");					\
}

#define iscsi_session_rd_digest_attr(field)				\
	iscsi_session_show_digest_fn(field)				\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

iscsi_session_rd_digest_attr(header_digest);
iscsi_session_rd_digest_attr(data_digest);

static ssize_t
show_port(struct class_device *cdev, char *buf)
{
	struct scsi_target *starget = transport_class_to_starget(cdev);
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);

	if (i->fnt->get_port)
		i->fnt->get_port(starget);

	return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
}
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);

static ssize_t
show_ip_address(struct class_device *cdev, char *buf)
{
	struct scsi_target *starget = transport_class_to_starget(cdev);
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);

	if (i->fnt->get_ip_address)
		i->fnt->get_ip_address(starget);

	if (iscsi_addr_type(starget) == AF_INET)
		return sprintf(buf, "%u.%u.%u.%u\n",
			       NIPQUAD(iscsi_sin_addr(starget)));
	else if(iscsi_addr_type(starget) == AF_INET6)
		return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
			       NIP6(iscsi_sin6_addr(starget)));
	return -EINVAL;
}
static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);

static ssize_t
show_isid(struct class_device *cdev, char *buf)
{
	struct scsi_target *starget = transport_class_to_starget(cdev);
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);

	if (i->fnt->get_isid)
		i->fnt->get_isid(starget);

	return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
		       iscsi_isid(starget)[0], iscsi_isid(starget)[1],
		       iscsi_isid(starget)[2], iscsi_isid(starget)[3],
		       iscsi_isid(starget)[4], iscsi_isid(starget)[5]);
}
static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);

/*
 * This is used for iSCSI names. Normally, we follow
 * the transport class convention of having the lld
 * set the field, but in these cases the value is
 * too large.
 */
#define iscsi_session_show_str_fn(field)				\
									\
static ssize_t								\
show_session_str_##field(struct class_device *cdev, char *buf)		\
{									\
	ssize_t ret = 0;						\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
									\
	if (i->fnt->get_##field)					\
		ret = i->fnt->get_##field(starget, buf, PAGE_SIZE);	\
	return ret;							\
}

#define iscsi_session_rd_str_attr(field)				\
	iscsi_session_show_str_fn(field)				\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL);

iscsi_session_rd_str_attr(target_name);
iscsi_session_rd_str_attr(target_alias);

/*
 * iSCSI host attrs
 */

/*
 * Again, this is used for iSCSI names. Normally, we follow
 * the transport class convention of having the lld set
 * the field, but in these cases the value is too large.
 */
#define iscsi_host_show_str_fn(field)					\
									\
static ssize_t								\
show_host_str_##field(struct class_device *cdev, char *buf)		\
{									\
	int ret = 0;							\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
									\
	if (i->fnt->get_##field)					\
		ret = i->fnt->get_##field(shost, buf, PAGE_SIZE);	\
	return ret;							\
}

#define iscsi_host_rd_str_attr(field)					\
	iscsi_host_show_str_fn(field)					\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL);

iscsi_host_rd_str_attr(initiator_name);
iscsi_host_rd_str_attr(initiator_alias);

#define SETUP_SESSION_RD_ATTR(field)					\
	if (i->fnt->show_##field) {					\
		i->session_attrs[count] = &class_device_attr_##field;	\
		count++;						\
	}

#define SETUP_HOST_RD_ATTR(field)					\
	if (i->fnt->show_##field) {					\
		i->host_attrs[count] = &class_device_attr_##field;	\
		count++;						\
	}

static int iscsi_host_match(struct attribute_container *cont,
			  struct device *dev)
{
	struct Scsi_Host *shost;
	struct iscsi_internal *i;

	if (!scsi_is_host_device(dev))
		return 0;

	shost = dev_to_shost(dev);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &iscsi_host_class.class)
		return 0;

	i = to_iscsi_internal(shost->transportt);
	
	return &i->t.host_attrs.ac == cont;
}

static int iscsi_target_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct iscsi_internal *i;

	if (!scsi_is_target_device(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &iscsi_host_class.class)
		return 0;

	i = to_iscsi_internal(shost->transportt);
	
	return &i->t.target_attrs.ac == cont;
}

struct scsi_transport_template *
iscsi_attach_transport(struct iscsi_function_template *fnt)
{
	struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
					   GFP_KERNEL);
	int count = 0;

	if (unlikely(!i))
		return NULL;

	memset(i, 0, sizeof(struct iscsi_internal));
	i->fnt = fnt;

	i->t.target_attrs.ac.attrs = &i->session_attrs[0];
	i->t.target_attrs.ac.class = &iscsi_transport_class.class;
	i->t.target_attrs.ac.match = iscsi_target_match;
	transport_container_register(&i->t.target_attrs);
	i->t.target_size = sizeof(struct iscsi_class_session);

	SETUP_SESSION_RD_ATTR(tsih);
	SETUP_SESSION_RD_ATTR(isid);
	SETUP_SESSION_RD_ATTR(header_digest);
	SETUP_SESSION_RD_ATTR(data_digest);
	SETUP_SESSION_RD_ATTR(target_name);
	SETUP_SESSION_RD_ATTR(target_alias);
	SETUP_SESSION_RD_ATTR(port);
	SETUP_SESSION_RD_ATTR(tpgt);
	SETUP_SESSION_RD_ATTR(ip_address);
	SETUP_SESSION_RD_ATTR(initial_r2t);
	SETUP_SESSION_RD_ATTR(immediate_data);
	SETUP_SESSION_RD_ATTR(max_recv_data_segment_len);
	SETUP_SESSION_RD_ATTR(max_burst_len);
	SETUP_SESSION_RD_ATTR(first_burst_len);
	SETUP_SESSION_RD_ATTR(def_time2wait);
	SETUP_SESSION_RD_ATTR(def_time2retain);
	SETUP_SESSION_RD_ATTR(max_outstanding_r2t);
	SETUP_SESSION_RD_ATTR(data_pdu_in_order);
	SETUP_SESSION_RD_ATTR(data_sequence_in_order);
	SETUP_SESSION_RD_ATTR(erl);

	BUG_ON(count > ISCSI_SESSION_ATTRS);
	i->session_attrs[count] = NULL;

	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	i->t.host_attrs.ac.class = &iscsi_host_class.class;
	i->t.host_attrs.ac.match = iscsi_host_match;
	transport_container_register(&i->t.host_attrs);
	i->t.host_size = 0;

	count = 0;
	SETUP_HOST_RD_ATTR(initiator_name);
	SETUP_HOST_RD_ATTR(initiator_alias);

	BUG_ON(count > ISCSI_HOST_ATTRS);
	i->host_attrs[count] = NULL;

	return &i->t;
}

EXPORT_SYMBOL(iscsi_attach_transport);

void iscsi_release_transport(struct scsi_transport_template *t)
{
	struct iscsi_internal *i = to_iscsi_internal(t);

	transport_container_unregister(&i->t.target_attrs);
	transport_container_unregister(&i->t.host_attrs);
  
	kfree(i);
}

EXPORT_SYMBOL(iscsi_release_transport);

static __init int iscsi_transport_init(void)
{
	int err = transport_class_register(&iscsi_transport_class);

	if (err)
		return err;
	return transport_class_register(&iscsi_host_class);
}

static void __exit iscsi_transport_exit(void)
{
	transport_class_unregister(&iscsi_host_class);
	transport_class_unregister(&iscsi_transport_class);
}

module_init(iscsi_transport_init);
module_exit(iscsi_transport_exit);

MODULE_AUTHOR("Mike Christie");
MODULE_DESCRIPTION("iSCSI Transport Attributes");
MODULE_LICENSE("GPL");