summaryrefslogtreecommitdiffstats
path: root/drivers/target/tcm_fc/tfc_conf.c
blob: e55c4d537592a6707db2bdb81c1f61a8ba59382b (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
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
/*******************************************************************************
 * Filename:  tcm_fc.c
 *
 * This file contains the configfs implementation for TCM_fc fabric node.
 * Based on tcm_loop_configfs.c
 *
 * Copyright (c) 2010 Cisco Systems, Inc.
 * Copyright (c) 2009,2010 Rising Tide, Inc.
 * Copyright (c) 2009,2010 Linux-iSCSI.org
 *
 * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * 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.
 ****************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <asm/unaligned.h>
#include <scsi/libfc.h>

#include <target/target_core_base.h>
#include <target/target_core_fabric.h>

#include "tcm_fc.h"

static LIST_HEAD(ft_wwn_list);
DEFINE_MUTEX(ft_lport_lock);

unsigned int ft_debug_logging;
module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

/*
 * Parse WWN.
 * If strict, we require lower-case hex and colon separators to be sure
 * the name is the same as what would be generated by ft_format_wwn()
 * so the name and wwn are mapped one-to-one.
 */
static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
{
	const char *cp;
	char c;
	u32 byte = 0;
	u32 pos = 0;
	u32 err;
	int val;

	*wwn = 0;
	for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
		c = *cp;
		if (c == '\n' && cp[1] == '\0')
			continue;
		if (strict && pos++ == 2 && byte++ < 7) {
			pos = 0;
			if (c == ':')
				continue;
			err = 1;
			goto fail;
		}
		if (c == '\0') {
			err = 2;
			if (strict && byte != 8)
				goto fail;
			return cp - name;
		}
		err = 3;
		val = hex_to_bin(c);
		if (val < 0 || (strict && isupper(c)))
			goto fail;
		*wwn = (*wwn << 4) | val;
	}
	err = 4;
fail:
	pr_debug("err %u len %zu pos %u byte %u\n",
		    err, cp - name, pos, byte);
	return -1;
}

ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
{
	u8 b[8];

	put_unaligned_be64(wwn, b);
	return snprintf(buf, len,
		 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
		 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
}

static ssize_t ft_wwn_show(void *arg, char *buf)
{
	u64 *wwn = arg;
	ssize_t len;

	len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
	buf[len++] = '\n';
	return len;
}

static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
{
	ssize_t ret;
	u64 wwn;

	ret = ft_parse_wwn(buf, &wwn, 0);
	if (ret > 0)
		*(u64 *)arg = wwn;
	return ret;
}

/*
 * ACL auth ops.
 */

static ssize_t ft_nacl_port_name_show(struct config_item *item, char *page)
{
	struct se_node_acl *se_nacl = acl_to_nacl(item);
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_show(&acl->node_auth.port_name, page);
}

static ssize_t ft_nacl_port_name_store(struct config_item *item,
		const char *page, size_t count)
{
	struct se_node_acl *se_nacl = acl_to_nacl(item);
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_store(&acl->node_auth.port_name, page, count);
}

static ssize_t ft_nacl_node_name_show(struct config_item *item,
		char *page)
{
	struct se_node_acl *se_nacl = acl_to_nacl(item);
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_show(&acl->node_auth.node_name, page);
}

static ssize_t ft_nacl_node_name_store(struct config_item *item,
		const char *page, size_t count)
{
	struct se_node_acl *se_nacl = acl_to_nacl(item);
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_store(&acl->node_auth.node_name, page, count);
}

CONFIGFS_ATTR(ft_nacl_, node_name);
CONFIGFS_ATTR(ft_nacl_, port_name);

static ssize_t ft_nacl_tag_show(struct config_item *item,
		char *page)
{
	return snprintf(page, PAGE_SIZE, "%s", acl_to_nacl(item)->acl_tag);
}

static ssize_t ft_nacl_tag_store(struct config_item *item,
		const char *page, size_t count)
{
	struct se_node_acl *se_nacl = acl_to_nacl(item);
	int ret;

	ret = core_tpg_set_initiator_node_tag(se_nacl->se_tpg, se_nacl, page);

	if (ret < 0)
		return ret;
	return count;
}

CONFIGFS_ATTR(ft_nacl_, tag);

static struct configfs_attribute *ft_nacl_base_attrs[] = {
	&ft_nacl_attr_port_name,
	&ft_nacl_attr_node_name,
	&ft_nacl_attr_tag,
	NULL,
};

/*
 * ACL ops.
 */

/*
 * Add ACL for an initiator.  The ACL is named arbitrarily.
 * The port_name and/or node_name are attributes.
 */
static int ft_init_nodeacl(struct se_node_acl *nacl, const char *name)
{
	struct ft_node_acl *acl =
		container_of(nacl, struct ft_node_acl, se_node_acl);
	u64 wwpn;

	if (ft_parse_wwn(name, &wwpn, 1) < 0)
		return -EINVAL;

	acl->node_auth.port_name = wwpn;
	return 0;
}

/*
 * local_port port_group (tpg) ops.
 */
static struct se_portal_group *ft_add_tpg(struct se_wwn *wwn, const char *name)
{
	struct ft_lport_wwn *ft_wwn;
	struct ft_tpg *tpg;
	struct workqueue_struct *wq;
	unsigned long index;
	int ret;

	pr_debug("tcm_fc: add tpg %s\n", name);

	/*
	 * Name must be "tpgt_" followed by the index.
	 */
	if (strstr(name, "tpgt_") != name)
		return NULL;

	ret = kstrtoul(name + 5, 10, &index);
	if (ret)
		return NULL;
	if (index > UINT_MAX)
		return NULL;

	if ((index != 1)) {
		pr_err("Error, a single TPG=1 is used for HW port mappings\n");
		return ERR_PTR(-ENOSYS);
	}

	ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn);
	tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
	if (!tpg)
		return NULL;
	tpg->index = index;
	tpg->lport_wwn = ft_wwn;
	INIT_LIST_HEAD(&tpg->lun_list);

	wq = alloc_workqueue("tcm_fc", 0, 1);
	if (!wq) {
		kfree(tpg);
		return NULL;
	}

	ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
	if (ret < 0) {
		destroy_workqueue(wq);
		kfree(tpg);
		return NULL;
	}
	tpg->workqueue = wq;

	mutex_lock(&ft_lport_lock);
	ft_wwn->tpg = tpg;
	mutex_unlock(&ft_lport_lock);

	return &tpg->se_tpg;
}

static void ft_del_tpg(struct se_portal_group *se_tpg)
{
	struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
	struct ft_lport_wwn *ft_wwn = tpg->lport_wwn;

	pr_debug("del tpg %s\n",
		    config_item_name(&tpg->se_tpg.tpg_group.cg_item));

	destroy_workqueue(tpg->workqueue);

	/* Wait for sessions to be freed thru RCU, for BUG_ON below */
	synchronize_rcu();

	mutex_lock(&ft_lport_lock);
	ft_wwn->tpg = NULL;
	if (tpg->tport) {
		tpg->tport->tpg = NULL;
		tpg->tport = NULL;
	}
	mutex_unlock(&ft_lport_lock);

	core_tpg_deregister(se_tpg);
	kfree(tpg);
}

/*
 * Verify that an lport is configured to use the tcm_fc module, and return
 * the target port group that should be used.
 *
 * The caller holds ft_lport_lock.
 */
struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
{
	struct ft_lport_wwn *ft_wwn;

	list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) {
		if (ft_wwn->wwpn == lport->wwpn)
			return ft_wwn->tpg;
	}
	return NULL;
}

/*
 * target config instance ops.
 */

/*
 * Add lport to allowed config.
 * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 */
static struct se_wwn *ft_add_wwn(
	struct target_fabric_configfs *tf,
	struct config_group *group,
	const char *name)
{
	struct ft_lport_wwn *ft_wwn;
	struct ft_lport_wwn *old_ft_wwn;
	u64 wwpn;

	pr_debug("add wwn %s\n", name);
	if (ft_parse_wwn(name, &wwpn, 1) < 0)
		return NULL;
	ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL);
	if (!ft_wwn)
		return NULL;
	ft_wwn->wwpn = wwpn;

	mutex_lock(&ft_lport_lock);
	list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) {
		if (old_ft_wwn->wwpn == wwpn) {
			mutex_unlock(&ft_lport_lock);
			kfree(ft_wwn);
			return NULL;
		}
	}
	list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list);
	ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn);
	mutex_unlock(&ft_lport_lock);

	return &ft_wwn->se_wwn;
}

static void ft_del_wwn(struct se_wwn *wwn)
{
	struct ft_lport_wwn *ft_wwn = container_of(wwn,
				struct ft_lport_wwn, se_wwn);

	pr_debug("del wwn %s\n", ft_wwn->name);
	mutex_lock(&ft_lport_lock);
	list_del(&ft_wwn->ft_wwn_node);
	mutex_unlock(&ft_lport_lock);

	kfree(ft_wwn);
}

static ssize_t ft_wwn_version_show(struct config_item *item, char *page)
{
	return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
		""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
}

CONFIGFS_ATTR_RO(ft_wwn_, version);

static struct configfs_attribute *ft_wwn_attrs[] = {
	&ft_wwn_attr_version,
	NULL,
};

static inline struct ft_tpg *ft_tpg(struct se_portal_group *se_tpg)
{
	return container_of(se_tpg, struct ft_tpg, se_tpg);
}

static char *ft_get_fabric_name(void)
{
	return "fc";
}

static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
{
	return ft_tpg(se_tpg)->lport_wwn->name;
}

static u16 ft_get_tag(struct se_portal_group *se_tpg)
{
	/*
	 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
	 * to represent the SCSI Target Port.
	 */
	return ft_tpg(se_tpg)->index;
}

static int ft_check_false(struct se_portal_group *se_tpg)
{
	return 0;
}

static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
{
}

static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
	return ft_tpg(se_tpg)->index;
}

static const struct target_core_fabric_ops ft_fabric_ops = {
	.module =			THIS_MODULE,
	.name =				"fc",
	.node_acl_size =		sizeof(struct ft_node_acl),
	.get_fabric_name =		ft_get_fabric_name,
	.tpg_get_wwn =			ft_get_fabric_wwn,
	.tpg_get_tag =			ft_get_tag,
	.tpg_check_demo_mode =		ft_check_false,
	.tpg_check_demo_mode_cache =	ft_check_false,
	.tpg_check_demo_mode_write_protect = ft_check_false,
	.tpg_check_prod_mode_write_protect = ft_check_false,
	.tpg_get_inst_index =		ft_tpg_get_inst_index,
	.check_stop_free =		ft_check_stop_free,
	.release_cmd =			ft_release_cmd,
	.close_session =		ft_sess_close,
	.sess_get_index =		ft_sess_get_index,
	.sess_get_initiator_sid =	NULL,
	.write_pending =		ft_write_pending,
	.write_pending_status =		ft_write_pending_status,
	.set_default_node_attributes =	ft_set_default_node_attr,
	.get_cmd_state =		ft_get_cmd_state,
	.queue_data_in =		ft_queue_data_in,
	.queue_status =			ft_queue_status,
	.queue_tm_rsp =			ft_queue_tm_resp,
	.aborted_task =			ft_aborted_task,
	/*
	 * Setup function pointers for generic logic in
	 * target_core_fabric_configfs.c
	 */
	.fabric_make_wwn =		&ft_add_wwn,
	.fabric_drop_wwn =		&ft_del_wwn,
	.fabric_make_tpg =		&ft_add_tpg,
	.fabric_drop_tpg =		&ft_del_tpg,
	.fabric_init_nodeacl =		&ft_init_nodeacl,

	.tfc_wwn_attrs			= ft_wwn_attrs,
	.tfc_tpg_nacl_base_attrs	= ft_nacl_base_attrs,
};

static struct notifier_block ft_notifier = {
	.notifier_call = ft_lport_notify
};

static int __init ft_init(void)
{
	int ret;

	ret = target_register_template(&ft_fabric_ops);
	if (ret)
		goto out;

	ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov);
	if (ret)
		goto out_unregister_template;

	blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
	fc_lport_iterate(ft_lport_add, NULL);
	return 0;

out_unregister_template:
	target_unregister_template(&ft_fabric_ops);
out:
	return ret;
}

static void __exit ft_exit(void)
{
	blocking_notifier_chain_unregister(&fc_lport_notifier_head,
					   &ft_notifier);
	fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
	fc_lport_iterate(ft_lport_del, NULL);
	target_unregister_template(&ft_fabric_ops);
	synchronize_rcu();
}

MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
MODULE_LICENSE("GPL");
module_init(ft_init);
module_exit(ft_exit);