summaryrefslogtreecommitdiffstats
path: root/net/caif/cfcnfg.c
blob: 246ac3aa8de51616081803d2befca90dcdf7f92d (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
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>
#include <net/caif/cfctrl.h>
#include <net/caif/cfmuxl.h>
#include <net/caif/cffrml.h>
#include <net/caif/cfserl.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/caif_dev.h>

#define container_obj(layr) container_of(layr, struct cfcnfg, layer)

/* Information about CAIF physical interfaces held by Config Module in order
 * to manage physical interfaces
 */
struct cfcnfg_phyinfo {
	struct list_head node;
	bool up;

	/* Pointer to the layer below the MUX (framing layer) */
	struct cflayer *frm_layer;
	/* Pointer to the lowest actual physical layer */
	struct cflayer *phy_layer;
	/* Unique identifier of the physical interface */
	unsigned int id;
	/* Preference of the physical in interface */
	enum cfcnfg_phy_preference pref;

	/* Information about the physical device */
	struct dev_info dev_info;

	/* Interface index */
	int ifindex;

	/* Protocol head room added for CAIF link layer */
	int head_room;

	/* Use Start of frame checksum */
	bool use_fcs;
};

struct cfcnfg {
	struct cflayer layer;
	struct cflayer *ctrl;
	struct cflayer *mux;
	struct list_head phys;
	struct mutex lock;
};

static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
			      enum cfctrl_srv serv, u8 phyid,
			      struct cflayer *adapt_layer);
static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
			      struct cflayer *adapt_layer);
static void cfctrl_resp_func(void);
static void cfctrl_enum_resp(void);

struct cfcnfg *cfcnfg_create(void)
{
	struct cfcnfg *this;
	struct cfctrl_rsp *resp;

	might_sleep();

	/* Initiate this layer */
	this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
	if (!this)
		return NULL;
	this->mux = cfmuxl_create();
	if (!this->mux)
		goto out_of_mem;
	this->ctrl = cfctrl_create();
	if (!this->ctrl)
		goto out_of_mem;
	/* Initiate response functions */
	resp = cfctrl_get_respfuncs(this->ctrl);
	resp->enum_rsp = cfctrl_enum_resp;
	resp->linkerror_ind = cfctrl_resp_func;
	resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
	resp->sleep_rsp = cfctrl_resp_func;
	resp->wake_rsp = cfctrl_resp_func;
	resp->restart_rsp = cfctrl_resp_func;
	resp->radioset_rsp = cfctrl_resp_func;
	resp->linksetup_rsp = cfcnfg_linkup_rsp;
	resp->reject_rsp = cfcnfg_reject_rsp;
	INIT_LIST_HEAD(&this->phys);

	cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
	layer_set_dn(this->ctrl, this->mux);
	layer_set_up(this->ctrl, this);
	mutex_init(&this->lock);

	return this;
out_of_mem:
	synchronize_rcu();

	kfree(this->mux);
	kfree(this->ctrl);
	kfree(this);
	return NULL;
}

void cfcnfg_remove(struct cfcnfg *cfg)
{
	might_sleep();
	if (cfg) {
		synchronize_rcu();

		kfree(cfg->mux);
		cfctrl_remove(cfg->ctrl);
		kfree(cfg);
	}
}

static void cfctrl_resp_func(void)
{
}

static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo_rcu(struct cfcnfg *cnfg,
						     u8 phyid)
{
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->id == phyid)
			return phy;
	return NULL;
}

static void cfctrl_enum_resp(void)
{
}

static struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
				  enum cfcnfg_phy_preference phy_pref)
{
	/* Try to match with specified preference */
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node) {
		if (phy->up && phy->pref == phy_pref &&
				phy->frm_layer != NULL)

			return &phy->dev_info;
	}

	/* Otherwise just return something */
	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->up)
			return &phy->dev_info;

	return NULL;
}

static int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
{
	struct cfcnfg_phyinfo *phy;

	list_for_each_entry_rcu(phy, &cnfg->phys, node)
		if (phy->ifindex == ifi && phy->up)
			return phy->id;
	return -ENODEV;
}

int caif_disconnect_client(struct net *net, struct cflayer *adap_layer)
{
	u8 channel_id;
	struct cfcnfg *cfg = get_cfcnfg(net);

	caif_assert(adap_layer != NULL);
	cfctrl_cancel_req(cfg->ctrl, adap_layer);
	channel_id = adap_layer->id;
	if (channel_id != 0) {
		struct cflayer *servl;
		servl = cfmuxl_remove_uplayer(cfg->mux, channel_id);
		cfctrl_linkdown_req(cfg->ctrl, channel_id, adap_layer);
		if (servl != NULL)
			layer_set_up(servl, NULL);
	} else
		pr_debug("nothing to disconnect\n");

	/* Do RCU sync before initiating cleanup */
	synchronize_rcu();
	if (adap_layer->ctrlcmd != NULL)
		adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
	return 0;

}
EXPORT_SYMBOL(caif_disconnect_client);

static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
{
}

static const int protohead[CFCTRL_SRV_MASK] = {
	[CFCTRL_SRV_VEI] = 4,
	[CFCTRL_SRV_DATAGRAM] = 7,
	[CFCTRL_SRV_UTIL] = 4,
	[CFCTRL_SRV_RFM] = 3,
	[CFCTRL_SRV_DBG] = 3,
};


static int caif_connect_req_to_link_param(struct cfcnfg *cnfg,
					  struct caif_connect_request *s,
					  struct cfctrl_link_param *l)
{
	struct dev_info *dev_info;
	enum cfcnfg_phy_preference pref;
	int res;

	memset(l, 0, sizeof(*l));
	/* In caif protocol low value is high priority */
	l->priority = CAIF_PRIO_MAX - s->priority + 1;

	if (s->ifindex != 0) {
		res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex);
		if (res < 0)
			return res;
		l->phyid = res;
	} else {
		switch (s->link_selector) {
		case CAIF_LINK_HIGH_BANDW:
			pref = CFPHYPREF_HIGH_BW;
			break;
		case CAIF_LINK_LOW_LATENCY:
			pref = CFPHYPREF_LOW_LAT;
			break;
		default:
			return -EINVAL;
		}
		dev_info = cfcnfg_get_phyid(cnfg, pref);
		if (dev_info == NULL)
			return -ENODEV;
		l->phyid = dev_info->id;
	}
	switch (s->protocol) {
	case CAIFPROTO_AT:
		l->linktype = CFCTRL_SRV_VEI;
		l->endpoint = (s->sockaddr.u.at.type >> 2) & 0x3;
		l->chtype = s->sockaddr.u.at.type & 0x3;
		break;
	case CAIFPROTO_DATAGRAM:
		l->linktype = CFCTRL_SRV_DATAGRAM;
		l->chtype = 0x00;
		l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
		break;
	case CAIFPROTO_DATAGRAM_LOOP:
		l->linktype = CFCTRL_SRV_DATAGRAM;
		l->chtype = 0x03;
		l->endpoint = 0x00;
		l->u.datagram.connid = s->sockaddr.u.dgm.connection_id;
		break;
	case CAIFPROTO_RFM:
		l->linktype = CFCTRL_SRV_RFM;
		l->u.datagram.connid = s->sockaddr.u.rfm.connection_id;
		strncpy(l->u.rfm.volume, s->sockaddr.u.rfm.volume,
			sizeof(l->u.rfm.volume)-1);
		l->u.rfm.volume[sizeof(l->u.rfm.volume)-1] = 0;
		break;
	case CAIFPROTO_UTIL:
		l->linktype = CFCTRL_SRV_UTIL;
		l->endpoint = 0x00;
		l->chtype = 0x00;
		strncpy(l->u.utility.name, s->sockaddr.u.util.service,
			sizeof(l->u.utility.name)-1);
		l->u.utility.name[sizeof(l->u.utility.name)-1] = 0;
		caif_assert(sizeof(l->u.utility.name) > 10);
		l->u.utility.paramlen = s->param.size;
		if (l->u.utility.paramlen > sizeof(l->u.utility.params))
			l->u.utility.paramlen = sizeof(l->u.utility.params);

		memcpy(l->u.utility.params, s->param.data,
		       l->u.utility.paramlen);

		break;
	case CAIFPROTO_DEBUG:
		l->linktype = CFCTRL_SRV_DBG;
		l->endpoint = s->sockaddr.u.dbg.service;
		l->chtype = s->sockaddr.u.dbg.type;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

int caif_connect_client(struct net *net, struct caif_connect_request *conn_req,
			struct cflayer *adap_layer, int *ifindex,
			int *proto_head, int *proto_tail)
{
	struct cflayer *frml;
	struct cfcnfg_phyinfo *phy;
	int err;
	struct cfctrl_link_param param;
	struct cfcnfg *cfg = get_cfcnfg(net);

	rcu_read_lock();
	err = caif_connect_req_to_link_param(cfg, conn_req, &param);
	if (err)
		goto unlock;

	phy = cfcnfg_get_phyinfo_rcu(cfg, param.phyid);
	if (!phy) {
		err = -ENODEV;
		goto unlock;
	}
	err = -EINVAL;

	if (adap_layer == NULL) {
		pr_err("adap_layer is zero\n");
		goto unlock;
	}
	if (adap_layer->receive == NULL) {
		pr_err("adap_layer->receive is NULL\n");
		goto unlock;
	}
	if (adap_layer->ctrlcmd == NULL) {
		pr_err("adap_layer->ctrlcmd == NULL\n");
		goto unlock;
	}

	err = -ENODEV;
	frml = phy->frm_layer;
	if (frml == NULL) {
		pr_err("Specified PHY type does not exist!\n");
		goto unlock;
	}
	caif_assert(param.phyid == phy->id);
	caif_assert(phy->frm_layer->id ==
		     param.phyid);
	caif_assert(phy->phy_layer->id ==
		     param.phyid);

	*ifindex = phy->ifindex;
	*proto_tail = 2;
	*proto_head = protohead[param.linktype] + phy->head_room;

	rcu_read_unlock();

	/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
	cfctrl_enum_req(cfg->ctrl, param.phyid);
	return cfctrl_linkup_request(cfg->ctrl, &param, adap_layer);

unlock:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(caif_connect_client);

static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
			      struct cflayer *adapt_layer)
{
	if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
		adapt_layer->ctrlcmd(adapt_layer,
				     CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
}

static void
cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
		  u8 phyid, struct cflayer *adapt_layer)
{
	struct cfcnfg *cnfg = container_obj(layer);
	struct cflayer *servicel = NULL;
	struct cfcnfg_phyinfo *phyinfo;
	struct net_device *netdev;

	if (channel_id == 0) {
		pr_warn("received channel_id zero\n");
		if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
			adapt_layer->ctrlcmd(adapt_layer,
						CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
		return;
	}

	rcu_read_lock();

	if (adapt_layer == NULL) {
		pr_debug("link setup response but no client exist,"
				"send linkdown back\n");
		cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
		goto unlock;
	}

	caif_assert(cnfg != NULL);
	caif_assert(phyid != 0);

	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);
	if (phyinfo == NULL) {
		pr_err("ERROR: Link Layer Device disappeared"
				"while connecting\n");
		goto unlock;
	}

	caif_assert(phyinfo != NULL);
	caif_assert(phyinfo->id == phyid);
	caif_assert(phyinfo->phy_layer != NULL);
	caif_assert(phyinfo->phy_layer->id == phyid);

	adapt_layer->id = channel_id;

	switch (serv) {
	case CFCTRL_SRV_VEI:
		servicel = cfvei_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_DATAGRAM:
		servicel = cfdgml_create(channel_id,
					&phyinfo->dev_info);
		break;
	case CFCTRL_SRV_RFM:
		netdev = phyinfo->dev_info.dev;
		servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
						netdev->mtu);
		break;
	case CFCTRL_SRV_UTIL:
		servicel = cfutill_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_VIDEO:
		servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
		break;
	case CFCTRL_SRV_DBG:
		servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
		break;
	default:
		pr_err("Protocol error. Link setup response "
				"- unknown channel type\n");
		goto unlock;
	}
	if (!servicel)
		goto unlock;
	layer_set_dn(servicel, cnfg->mux);
	cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
	layer_set_up(servicel, adapt_layer);
	layer_set_dn(adapt_layer, servicel);

	rcu_read_unlock();

	servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
	return;
unlock:
	rcu_read_unlock();
}

void
cfcnfg_add_phy_layer(struct cfcnfg *cnfg,
		     struct net_device *dev, struct cflayer *phy_layer,
		     enum cfcnfg_phy_preference pref,
		     struct cflayer *link_support,
		     bool fcs, int head_room)
{
	struct cflayer *frml;
	struct cfcnfg_phyinfo *phyinfo = NULL;
	int i;
	u8 phyid;

	mutex_lock(&cnfg->lock);

	/* CAIF protocol allow maximum 6 link-layers */
	for (i = 0; i < 7; i++) {
		phyid = (dev->ifindex + i) & 0x7;
		if (phyid == 0)
			continue;
		if (cfcnfg_get_phyinfo_rcu(cnfg, phyid) == NULL)
			goto got_phyid;
	}
	pr_warn("Too many CAIF Link Layers (max 6)\n");
	goto out;

got_phyid:
	phyinfo = kzalloc(sizeof(struct cfcnfg_phyinfo), GFP_ATOMIC);
	if (!phyinfo)
		goto out_err;

	phy_layer->id = phyid;
	phyinfo->pref = pref;
	phyinfo->id = phyid;
	phyinfo->dev_info.id = phyid;
	phyinfo->dev_info.dev = dev;
	phyinfo->phy_layer = phy_layer;
	phyinfo->ifindex = dev->ifindex;
	phyinfo->head_room = head_room;
	phyinfo->use_fcs = fcs;

	frml = cffrml_create(phyid, fcs);

	if (!frml)
		goto out_err;
	phyinfo->frm_layer = frml;
	layer_set_up(frml, cnfg->mux);

	if (link_support != NULL) {
		link_support->id = phyid;
		layer_set_dn(frml, link_support);
		layer_set_up(link_support, frml);
		layer_set_dn(link_support, phy_layer);
		layer_set_up(phy_layer, link_support);
	} else {
		layer_set_dn(frml, phy_layer);
		layer_set_up(phy_layer, frml);
	}

	list_add_rcu(&phyinfo->node, &cnfg->phys);
out:
	mutex_unlock(&cnfg->lock);
	return;

out_err:
	kfree(phyinfo);
	mutex_unlock(&cnfg->lock);
}
EXPORT_SYMBOL(cfcnfg_add_phy_layer);

int cfcnfg_set_phy_state(struct cfcnfg *cnfg, struct cflayer *phy_layer,
			 bool up)
{
	struct cfcnfg_phyinfo *phyinfo;

	rcu_read_lock();
	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phy_layer->id);
	if (phyinfo == NULL) {
		rcu_read_unlock();
		return -ENODEV;
	}

	if (phyinfo->up == up) {
		rcu_read_unlock();
		return 0;
	}
	phyinfo->up = up;

	if (up) {
		cffrml_hold(phyinfo->frm_layer);
		cfmuxl_set_dnlayer(cnfg->mux, phyinfo->frm_layer,
					phy_layer->id);
	} else {
		cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
		cffrml_put(phyinfo->frm_layer);
	}

	rcu_read_unlock();
	return 0;
}
EXPORT_SYMBOL(cfcnfg_set_phy_state);

int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
{
	struct cflayer *frml, *frml_dn;
	u16 phyid;
	struct cfcnfg_phyinfo *phyinfo;

	might_sleep();

	mutex_lock(&cnfg->lock);

	phyid = phy_layer->id;
	phyinfo = cfcnfg_get_phyinfo_rcu(cnfg, phyid);

	if (phyinfo == NULL) {
		mutex_unlock(&cnfg->lock);
		return 0;
	}
	caif_assert(phyid == phyinfo->id);
	caif_assert(phy_layer == phyinfo->phy_layer);
	caif_assert(phy_layer->id == phyid);
	caif_assert(phyinfo->frm_layer->id == phyid);

	list_del_rcu(&phyinfo->node);
	synchronize_rcu();

	/* Fail if reference count is not zero */
	if (cffrml_refcnt_read(phyinfo->frm_layer) != 0) {
		pr_info("Wait for device inuse\n");
		list_add_rcu(&phyinfo->node, &cnfg->phys);
		mutex_unlock(&cnfg->lock);
		return -EAGAIN;
	}

	frml = phyinfo->frm_layer;
	frml_dn = frml->dn;
	cffrml_set_uplayer(frml, NULL);
	cffrml_set_dnlayer(frml, NULL);
	if (phy_layer != frml_dn) {
		layer_set_up(frml_dn, NULL);
		layer_set_dn(frml_dn, NULL);
	}
	layer_set_up(phy_layer, NULL);

	if (phyinfo->phy_layer != frml_dn)
		kfree(frml_dn);

	cffrml_free(frml);
	kfree(phyinfo);
	mutex_unlock(&cnfg->lock);

	return 0;
}
EXPORT_SYMBOL(cfcnfg_del_phy_layer);